Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
Zach Brown | ec6b910 | 2007-07-11 10:00:37 -0400 | [diff] [blame] | 18 | #include <linux/sched.h> |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 19 | #include <linux/pagemap.h> |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 20 | #include <linux/writeback.h> |
David Woodhouse | 21af804 | 2008-08-12 14:13:26 +0100 | [diff] [blame] | 21 | #include <linux/blkdev.h> |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 22 | #include <linux/sort.h> |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 23 | #include <linux/rcupdate.h> |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 24 | #include "compat.h" |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 25 | #include "hash.h" |
Miguel | a5eb62e | 2008-04-11 15:45:51 -0400 | [diff] [blame] | 26 | #include "crc32c.h" |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 27 | #include "ctree.h" |
| 28 | #include "disk-io.h" |
| 29 | #include "print-tree.h" |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 30 | #include "transaction.h" |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 31 | #include "volumes.h" |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 32 | #include "locking.h" |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 33 | #include "ref-cache.h" |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 34 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 35 | #define PENDING_EXTENT_INSERT 0 |
| 36 | #define PENDING_EXTENT_DELETE 1 |
| 37 | #define PENDING_BACKREF_UPDATE 2 |
| 38 | |
| 39 | struct pending_extent_op { |
| 40 | int type; |
| 41 | u64 bytenr; |
| 42 | u64 num_bytes; |
| 43 | u64 parent; |
| 44 | u64 orig_parent; |
| 45 | u64 generation; |
| 46 | u64 orig_generation; |
| 47 | int level; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 48 | struct list_head list; |
| 49 | int del; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 50 | }; |
| 51 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 52 | static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, |
| 53 | struct btrfs_root *root, u64 parent, |
| 54 | u64 root_objectid, u64 ref_generation, |
| 55 | u64 owner, struct btrfs_key *ins, |
| 56 | int ref_mod); |
| 57 | static int update_reserved_extents(struct btrfs_root *root, |
| 58 | u64 bytenr, u64 num, int reserve); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 59 | static int update_block_group(struct btrfs_trans_handle *trans, |
| 60 | struct btrfs_root *root, |
| 61 | u64 bytenr, u64 num_bytes, int alloc, |
| 62 | int mark_free); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 63 | static noinline int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
| 64 | struct btrfs_root *root, |
| 65 | u64 bytenr, u64 num_bytes, u64 parent, |
| 66 | u64 root_objectid, u64 ref_generation, |
| 67 | u64 owner_objectid, int pin, |
| 68 | int ref_to_drop); |
Yan | d548ee5 | 2008-01-03 13:56:30 -0500 | [diff] [blame] | 69 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 70 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
| 71 | struct btrfs_root *extent_root, u64 alloc_bytes, |
| 72 | u64 flags, int force); |
| 73 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 74 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
| 75 | { |
| 76 | return (cache->flags & bits) == bits; |
| 77 | } |
| 78 | |
| 79 | /* |
| 80 | * this adds the block group to the fs_info rb tree for the block group |
| 81 | * cache |
| 82 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 83 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 84 | struct btrfs_block_group_cache *block_group) |
| 85 | { |
| 86 | struct rb_node **p; |
| 87 | struct rb_node *parent = NULL; |
| 88 | struct btrfs_block_group_cache *cache; |
| 89 | |
| 90 | spin_lock(&info->block_group_cache_lock); |
| 91 | p = &info->block_group_cache_tree.rb_node; |
| 92 | |
| 93 | while (*p) { |
| 94 | parent = *p; |
| 95 | cache = rb_entry(parent, struct btrfs_block_group_cache, |
| 96 | cache_node); |
| 97 | if (block_group->key.objectid < cache->key.objectid) { |
| 98 | p = &(*p)->rb_left; |
| 99 | } else if (block_group->key.objectid > cache->key.objectid) { |
| 100 | p = &(*p)->rb_right; |
| 101 | } else { |
| 102 | spin_unlock(&info->block_group_cache_lock); |
| 103 | return -EEXIST; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | rb_link_node(&block_group->cache_node, parent, p); |
| 108 | rb_insert_color(&block_group->cache_node, |
| 109 | &info->block_group_cache_tree); |
| 110 | spin_unlock(&info->block_group_cache_lock); |
| 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | /* |
| 116 | * This will return the block group at or after bytenr if contains is 0, else |
| 117 | * it will return the block group that contains the bytenr |
| 118 | */ |
| 119 | static struct btrfs_block_group_cache * |
| 120 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, |
| 121 | int contains) |
| 122 | { |
| 123 | struct btrfs_block_group_cache *cache, *ret = NULL; |
| 124 | struct rb_node *n; |
| 125 | u64 end, start; |
| 126 | |
| 127 | spin_lock(&info->block_group_cache_lock); |
| 128 | n = info->block_group_cache_tree.rb_node; |
| 129 | |
| 130 | while (n) { |
| 131 | cache = rb_entry(n, struct btrfs_block_group_cache, |
| 132 | cache_node); |
| 133 | end = cache->key.objectid + cache->key.offset - 1; |
| 134 | start = cache->key.objectid; |
| 135 | |
| 136 | if (bytenr < start) { |
| 137 | if (!contains && (!ret || start < ret->key.objectid)) |
| 138 | ret = cache; |
| 139 | n = n->rb_left; |
| 140 | } else if (bytenr > start) { |
| 141 | if (contains && bytenr <= end) { |
| 142 | ret = cache; |
| 143 | break; |
| 144 | } |
| 145 | n = n->rb_right; |
| 146 | } else { |
| 147 | ret = cache; |
| 148 | break; |
| 149 | } |
| 150 | } |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 151 | if (ret) |
| 152 | atomic_inc(&ret->count); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 153 | spin_unlock(&info->block_group_cache_lock); |
| 154 | |
| 155 | return ret; |
| 156 | } |
| 157 | |
| 158 | /* |
| 159 | * this is only called by cache_block_group, since we could have freed extents |
| 160 | * we need to check the pinned_extents for any extents that can't be used yet |
| 161 | * since their free space will be released as soon as the transaction commits. |
| 162 | */ |
| 163 | static int add_new_free_space(struct btrfs_block_group_cache *block_group, |
| 164 | struct btrfs_fs_info *info, u64 start, u64 end) |
| 165 | { |
| 166 | u64 extent_start, extent_end, size; |
| 167 | int ret; |
| 168 | |
| 169 | while (start < end) { |
| 170 | ret = find_first_extent_bit(&info->pinned_extents, start, |
| 171 | &extent_start, &extent_end, |
| 172 | EXTENT_DIRTY); |
| 173 | if (ret) |
| 174 | break; |
| 175 | |
| 176 | if (extent_start == start) { |
| 177 | start = extent_end + 1; |
| 178 | } else if (extent_start > start && extent_start < end) { |
| 179 | size = extent_start - start; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 180 | ret = btrfs_add_free_space(block_group, start, |
| 181 | size); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 182 | BUG_ON(ret); |
| 183 | start = extent_end + 1; |
| 184 | } else { |
| 185 | break; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | if (start < end) { |
| 190 | size = end - start; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 191 | ret = btrfs_add_free_space(block_group, start, size); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 192 | BUG_ON(ret); |
| 193 | } |
| 194 | |
| 195 | return 0; |
| 196 | } |
| 197 | |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 198 | static int remove_sb_from_cache(struct btrfs_root *root, |
| 199 | struct btrfs_block_group_cache *cache) |
| 200 | { |
| 201 | u64 bytenr; |
| 202 | u64 *logical; |
| 203 | int stripe_len; |
| 204 | int i, nr, ret; |
| 205 | |
| 206 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
| 207 | bytenr = btrfs_sb_offset(i); |
| 208 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, |
| 209 | cache->key.objectid, bytenr, 0, |
| 210 | &logical, &nr, &stripe_len); |
| 211 | BUG_ON(ret); |
| 212 | while (nr--) { |
| 213 | btrfs_remove_free_space(cache, logical[nr], |
| 214 | stripe_len); |
| 215 | } |
| 216 | kfree(logical); |
| 217 | } |
| 218 | return 0; |
| 219 | } |
| 220 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 221 | static int cache_block_group(struct btrfs_root *root, |
| 222 | struct btrfs_block_group_cache *block_group) |
| 223 | { |
| 224 | struct btrfs_path *path; |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 225 | int ret = 0; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 226 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 227 | struct extent_buffer *leaf; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 228 | int slot; |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 229 | u64 last; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 230 | |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 231 | if (!block_group) |
| 232 | return 0; |
| 233 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 234 | root = root->fs_info->extent_root; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 235 | |
| 236 | if (block_group->cached) |
| 237 | return 0; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 238 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 239 | path = btrfs_alloc_path(); |
| 240 | if (!path) |
| 241 | return -ENOMEM; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 242 | |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 243 | path->reada = 2; |
Chris Mason | 5cd57b2 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 244 | /* |
| 245 | * we get into deadlocks with paths held by callers of this function. |
| 246 | * since the alloc_mutex is protecting things right now, just |
| 247 | * skip the locking here |
| 248 | */ |
| 249 | path->skip_locking = 1; |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 250 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
| 251 | key.objectid = last; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 252 | key.offset = 0; |
| 253 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
| 254 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 255 | if (ret < 0) |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 256 | goto err; |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 257 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 258 | while (1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 259 | leaf = path->nodes[0]; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 260 | slot = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 261 | if (slot >= btrfs_header_nritems(leaf)) { |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 262 | ret = btrfs_next_leaf(root, path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 263 | if (ret < 0) |
| 264 | goto err; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 265 | if (ret == 0) |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 266 | continue; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 267 | else |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 268 | break; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 269 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 270 | btrfs_item_key_to_cpu(leaf, &key, slot); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 271 | if (key.objectid < block_group->key.objectid) |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 272 | goto next; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 273 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 274 | if (key.objectid >= block_group->key.objectid + |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 275 | block_group->key.offset) |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 276 | break; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 277 | |
| 278 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 279 | add_new_free_space(block_group, root->fs_info, last, |
| 280 | key.objectid); |
| 281 | |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 282 | last = key.objectid + key.offset; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 283 | } |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 284 | next: |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 285 | path->slots[0]++; |
| 286 | } |
| 287 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 288 | add_new_free_space(block_group, root->fs_info, last, |
| 289 | block_group->key.objectid + |
| 290 | block_group->key.offset); |
| 291 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 292 | block_group->cached = 1; |
Josef Bacik | 70cb074 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 293 | remove_sb_from_cache(root, block_group); |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 294 | ret = 0; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 295 | err: |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 296 | btrfs_free_path(path); |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 297 | return ret; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 298 | } |
| 299 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 300 | /* |
| 301 | * return the block group that starts at or after bytenr |
| 302 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 303 | static struct btrfs_block_group_cache * |
| 304 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 305 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 306 | struct btrfs_block_group_cache *cache; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 307 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 308 | cache = block_group_cache_tree_search(info, bytenr, 0); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 309 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 310 | return cache; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 311 | } |
| 312 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 313 | /* |
| 314 | * return the block group that contains teh given bytenr |
| 315 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 316 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
| 317 | struct btrfs_fs_info *info, |
| 318 | u64 bytenr) |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 319 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 320 | struct btrfs_block_group_cache *cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 321 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 322 | cache = block_group_cache_tree_search(info, bytenr, 1); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 323 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 324 | return cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 325 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 326 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 327 | static inline void put_block_group(struct btrfs_block_group_cache *cache) |
| 328 | { |
| 329 | if (atomic_dec_and_test(&cache->count)) |
| 330 | kfree(cache); |
| 331 | } |
| 332 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 333 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
| 334 | u64 flags) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 335 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 336 | struct list_head *head = &info->space_info; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 337 | struct btrfs_space_info *found; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 338 | |
| 339 | rcu_read_lock(); |
| 340 | list_for_each_entry_rcu(found, head, list) { |
| 341 | if (found->flags == flags) { |
| 342 | rcu_read_unlock(); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 343 | return found; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 344 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 345 | } |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 346 | rcu_read_unlock(); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 347 | return NULL; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 348 | } |
| 349 | |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 350 | /* |
| 351 | * after adding space to the filesystem, we need to clear the full flags |
| 352 | * on all the space infos. |
| 353 | */ |
| 354 | void btrfs_clear_space_info_full(struct btrfs_fs_info *info) |
| 355 | { |
| 356 | struct list_head *head = &info->space_info; |
| 357 | struct btrfs_space_info *found; |
| 358 | |
| 359 | rcu_read_lock(); |
| 360 | list_for_each_entry_rcu(found, head, list) |
| 361 | found->full = 0; |
| 362 | rcu_read_unlock(); |
| 363 | } |
| 364 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 365 | static u64 div_factor(u64 num, int factor) |
| 366 | { |
| 367 | if (factor == 10) |
| 368 | return num; |
| 369 | num *= factor; |
| 370 | do_div(num, 10); |
| 371 | return num; |
| 372 | } |
| 373 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 374 | u64 btrfs_find_block_group(struct btrfs_root *root, |
| 375 | u64 search_start, u64 search_hint, int owner) |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 376 | { |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 377 | struct btrfs_block_group_cache *cache; |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 378 | u64 used; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 379 | u64 last = max(search_hint, search_start); |
| 380 | u64 group_start = 0; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 381 | int full_search = 0; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 382 | int factor = 9; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 383 | int wrapped = 0; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 384 | again: |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 385 | while (1) { |
| 386 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 387 | if (!cache) |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 388 | break; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 389 | |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 390 | spin_lock(&cache->lock); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 391 | last = cache->key.objectid + cache->key.offset; |
| 392 | used = btrfs_block_group_used(&cache->item); |
| 393 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 394 | if ((full_search || !cache->ro) && |
| 395 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 396 | if (used + cache->pinned + cache->reserved < |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 397 | div_factor(cache->key.offset, factor)) { |
| 398 | group_start = cache->key.objectid; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 399 | spin_unlock(&cache->lock); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 400 | put_block_group(cache); |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 401 | goto found; |
| 402 | } |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 403 | } |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 404 | spin_unlock(&cache->lock); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 405 | put_block_group(cache); |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame] | 406 | cond_resched(); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 407 | } |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 408 | if (!wrapped) { |
| 409 | last = search_start; |
| 410 | wrapped = 1; |
| 411 | goto again; |
| 412 | } |
| 413 | if (!full_search && factor < 10) { |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 414 | last = search_start; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 415 | full_search = 1; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 416 | factor = 10; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 417 | goto again; |
| 418 | } |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 419 | found: |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 420 | return group_start; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 421 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 422 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 423 | /* simple helper to search for an existing extent at a given offset */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 424 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 425 | { |
| 426 | int ret; |
| 427 | struct btrfs_key key; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 428 | struct btrfs_path *path; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 429 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 430 | path = btrfs_alloc_path(); |
| 431 | BUG_ON(!path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 432 | key.objectid = start; |
| 433 | key.offset = len; |
| 434 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
| 435 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, |
| 436 | 0, 0); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 437 | btrfs_free_path(path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 438 | return ret; |
| 439 | } |
| 440 | |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 441 | /* |
| 442 | * Back reference rules. Back refs have three main goals: |
| 443 | * |
| 444 | * 1) differentiate between all holders of references to an extent so that |
| 445 | * when a reference is dropped we can make sure it was a valid reference |
| 446 | * before freeing the extent. |
| 447 | * |
| 448 | * 2) Provide enough information to quickly find the holders of an extent |
| 449 | * if we notice a given block is corrupted or bad. |
| 450 | * |
| 451 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool |
| 452 | * maintenance. This is actually the same as #2, but with a slightly |
| 453 | * different use case. |
| 454 | * |
| 455 | * File extents can be referenced by: |
| 456 | * |
| 457 | * - multiple snapshots, subvolumes, or different generations in one subvol |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 458 | * - different files inside a single subvolume |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 459 | * - different offsets inside a file (bookend extents in file.c) |
| 460 | * |
| 461 | * The extent ref structure has fields for: |
| 462 | * |
| 463 | * - Objectid of the subvolume root |
| 464 | * - Generation number of the tree holding the reference |
| 465 | * - objectid of the file holding the reference |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 466 | * - number of references holding by parent node (alway 1 for tree blocks) |
| 467 | * |
| 468 | * Btree leaf may hold multiple references to a file extent. In most cases, |
| 469 | * these references are from same file and the corresponding offsets inside |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 470 | * the file are close together. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 471 | * |
| 472 | * When a file extent is allocated the fields are filled in: |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 473 | * (root_key.objectid, trans->transid, inode objectid, 1) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 474 | * |
| 475 | * When a leaf is cow'd new references are added for every file extent found |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 476 | * in the leaf. It looks similar to the create case, but trans->transid will |
| 477 | * be different when the block is cow'd. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 478 | * |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 479 | * (root_key.objectid, trans->transid, inode objectid, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 480 | * number of references in the leaf) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 481 | * |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 482 | * When a file extent is removed either during snapshot deletion or |
| 483 | * file truncation, we find the corresponding back reference and check |
| 484 | * the following fields: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 485 | * |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 486 | * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), |
| 487 | * inode objectid) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 488 | * |
| 489 | * Btree extents can be referenced by: |
| 490 | * |
| 491 | * - Different subvolumes |
| 492 | * - Different generations of the same subvolume |
| 493 | * |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 494 | * When a tree block is created, back references are inserted: |
| 495 | * |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 496 | * (root->root_key.objectid, trans->transid, level, 1) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 497 | * |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 498 | * When a tree block is cow'd, new back references are added for all the |
| 499 | * blocks it points to. If the tree block isn't in reference counted root, |
| 500 | * the old back references are removed. These new back references are of |
| 501 | * the form (trans->transid will have increased since creation): |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 502 | * |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 503 | * (root->root_key.objectid, trans->transid, level, 1) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 504 | * |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 505 | * When a backref is in deleting, the following fields are checked: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 506 | * |
| 507 | * if backref was for a tree root: |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 508 | * (btrfs_header_owner(itself), btrfs_header_generation(itself), level) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 509 | * else |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 510 | * (btrfs_header_owner(parent), btrfs_header_generation(parent), level) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 511 | * |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 512 | * Back Reference Key composing: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 513 | * |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 514 | * The key objectid corresponds to the first byte in the extent, the key |
| 515 | * type is set to BTRFS_EXTENT_REF_KEY, and the key offset is the first |
| 516 | * byte of parent extent. If a extent is tree root, the key offset is set |
| 517 | * to the key objectid. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 518 | */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 519 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 520 | static noinline int lookup_extent_backref(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 521 | struct btrfs_root *root, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 522 | struct btrfs_path *path, |
| 523 | u64 bytenr, u64 parent, |
| 524 | u64 ref_root, u64 ref_generation, |
| 525 | u64 owner_objectid, int del) |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 526 | { |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 527 | struct btrfs_key key; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 528 | struct btrfs_extent_ref *ref; |
| 529 | struct extent_buffer *leaf; |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 530 | u64 ref_objectid; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 531 | int ret; |
| 532 | |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 533 | key.objectid = bytenr; |
| 534 | key.type = BTRFS_EXTENT_REF_KEY; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 535 | key.offset = parent; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 536 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 537 | ret = btrfs_search_slot(trans, root, &key, path, del ? -1 : 0, 1); |
| 538 | if (ret < 0) |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 539 | goto out; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 540 | if (ret > 0) { |
| 541 | ret = -ENOENT; |
| 542 | goto out; |
| 543 | } |
| 544 | |
| 545 | leaf = path->nodes[0]; |
| 546 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 547 | ref_objectid = btrfs_ref_objectid(leaf, ref); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 548 | if (btrfs_ref_root(leaf, ref) != ref_root || |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 549 | btrfs_ref_generation(leaf, ref) != ref_generation || |
| 550 | (ref_objectid != owner_objectid && |
| 551 | ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 552 | ret = -EIO; |
| 553 | WARN_ON(1); |
| 554 | goto out; |
| 555 | } |
| 556 | ret = 0; |
| 557 | out: |
| 558 | return ret; |
| 559 | } |
| 560 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 561 | static noinline int insert_extent_backref(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 562 | struct btrfs_root *root, |
| 563 | struct btrfs_path *path, |
| 564 | u64 bytenr, u64 parent, |
| 565 | u64 ref_root, u64 ref_generation, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 566 | u64 owner_objectid, |
| 567 | int refs_to_add) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 568 | { |
| 569 | struct btrfs_key key; |
| 570 | struct extent_buffer *leaf; |
| 571 | struct btrfs_extent_ref *ref; |
| 572 | u32 num_refs; |
| 573 | int ret; |
| 574 | |
| 575 | key.objectid = bytenr; |
| 576 | key.type = BTRFS_EXTENT_REF_KEY; |
| 577 | key.offset = parent; |
| 578 | |
| 579 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*ref)); |
| 580 | if (ret == 0) { |
| 581 | leaf = path->nodes[0]; |
| 582 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 583 | struct btrfs_extent_ref); |
| 584 | btrfs_set_ref_root(leaf, ref, ref_root); |
| 585 | btrfs_set_ref_generation(leaf, ref, ref_generation); |
| 586 | btrfs_set_ref_objectid(leaf, ref, owner_objectid); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 587 | btrfs_set_ref_num_refs(leaf, ref, refs_to_add); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 588 | } else if (ret == -EEXIST) { |
| 589 | u64 existing_owner; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 590 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 591 | BUG_ON(owner_objectid < BTRFS_FIRST_FREE_OBJECTID); |
| 592 | leaf = path->nodes[0]; |
| 593 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 594 | struct btrfs_extent_ref); |
| 595 | if (btrfs_ref_root(leaf, ref) != ref_root || |
| 596 | btrfs_ref_generation(leaf, ref) != ref_generation) { |
| 597 | ret = -EIO; |
| 598 | WARN_ON(1); |
| 599 | goto out; |
| 600 | } |
| 601 | |
| 602 | num_refs = btrfs_ref_num_refs(leaf, ref); |
| 603 | BUG_ON(num_refs == 0); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 604 | btrfs_set_ref_num_refs(leaf, ref, num_refs + refs_to_add); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 605 | |
| 606 | existing_owner = btrfs_ref_objectid(leaf, ref); |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 607 | if (existing_owner != owner_objectid && |
| 608 | existing_owner != BTRFS_MULTIPLE_OBJECTIDS) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 609 | btrfs_set_ref_objectid(leaf, ref, |
| 610 | BTRFS_MULTIPLE_OBJECTIDS); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 611 | } |
| 612 | ret = 0; |
| 613 | } else { |
| 614 | goto out; |
| 615 | } |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 616 | btrfs_unlock_up_safe(path, 1); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 617 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 618 | out: |
| 619 | btrfs_release_path(root, path); |
| 620 | return ret; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 621 | } |
| 622 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 623 | static noinline int remove_extent_backref(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 624 | struct btrfs_root *root, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 625 | struct btrfs_path *path, |
| 626 | int refs_to_drop) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 627 | { |
| 628 | struct extent_buffer *leaf; |
| 629 | struct btrfs_extent_ref *ref; |
| 630 | u32 num_refs; |
| 631 | int ret = 0; |
| 632 | |
| 633 | leaf = path->nodes[0]; |
| 634 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); |
| 635 | num_refs = btrfs_ref_num_refs(leaf, ref); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 636 | BUG_ON(num_refs < refs_to_drop); |
| 637 | num_refs -= refs_to_drop; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 638 | if (num_refs == 0) { |
| 639 | ret = btrfs_del_item(trans, root, path); |
| 640 | } else { |
| 641 | btrfs_set_ref_num_refs(leaf, ref, num_refs); |
| 642 | btrfs_mark_buffer_dirty(leaf); |
| 643 | } |
| 644 | btrfs_release_path(root, path); |
| 645 | return ret; |
| 646 | } |
| 647 | |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 648 | #ifdef BIO_RW_DISCARD |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 649 | static void btrfs_issue_discard(struct block_device *bdev, |
| 650 | u64 start, u64 len) |
| 651 | { |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 652 | blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL); |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 653 | } |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 654 | #endif |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 655 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 656 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, |
| 657 | u64 num_bytes) |
| 658 | { |
| 659 | #ifdef BIO_RW_DISCARD |
| 660 | int ret; |
| 661 | u64 map_length = num_bytes; |
| 662 | struct btrfs_multi_bio *multi = NULL; |
| 663 | |
| 664 | /* Tell the block device(s) that the sectors can be discarded */ |
| 665 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, |
| 666 | bytenr, &map_length, &multi, 0); |
| 667 | if (!ret) { |
| 668 | struct btrfs_bio_stripe *stripe = multi->stripes; |
| 669 | int i; |
| 670 | |
| 671 | if (map_length > num_bytes) |
| 672 | map_length = num_bytes; |
| 673 | |
| 674 | for (i = 0; i < multi->num_stripes; i++, stripe++) { |
| 675 | btrfs_issue_discard(stripe->dev->bdev, |
| 676 | stripe->physical, |
| 677 | map_length); |
| 678 | } |
| 679 | kfree(multi); |
| 680 | } |
| 681 | |
| 682 | return ret; |
| 683 | #else |
| 684 | return 0; |
| 685 | #endif |
| 686 | } |
| 687 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 688 | static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans, |
| 689 | struct btrfs_root *root, u64 bytenr, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 690 | u64 num_bytes, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 691 | u64 orig_parent, u64 parent, |
| 692 | u64 orig_root, u64 ref_root, |
| 693 | u64 orig_generation, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 694 | u64 owner_objectid) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 695 | { |
| 696 | int ret; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 697 | int pin = owner_objectid < BTRFS_FIRST_FREE_OBJECTID; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 698 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 699 | ret = btrfs_update_delayed_ref(trans, bytenr, num_bytes, |
| 700 | orig_parent, parent, orig_root, |
| 701 | ref_root, orig_generation, |
| 702 | ref_generation, owner_objectid, pin); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 703 | BUG_ON(ret); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 704 | return ret; |
| 705 | } |
| 706 | |
| 707 | int btrfs_update_extent_ref(struct btrfs_trans_handle *trans, |
| 708 | struct btrfs_root *root, u64 bytenr, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 709 | u64 num_bytes, u64 orig_parent, u64 parent, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 710 | u64 ref_root, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 711 | u64 owner_objectid) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 712 | { |
| 713 | int ret; |
| 714 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && |
| 715 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) |
| 716 | return 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 717 | |
| 718 | ret = __btrfs_update_extent_ref(trans, root, bytenr, num_bytes, |
| 719 | orig_parent, parent, ref_root, |
| 720 | ref_root, ref_generation, |
| 721 | ref_generation, owner_objectid); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 722 | return ret; |
| 723 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 724 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 725 | struct btrfs_root *root, u64 bytenr, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 726 | u64 num_bytes, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 727 | u64 orig_parent, u64 parent, |
| 728 | u64 orig_root, u64 ref_root, |
| 729 | u64 orig_generation, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 730 | u64 owner_objectid) |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 731 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 732 | int ret; |
| 733 | |
| 734 | ret = btrfs_add_delayed_ref(trans, bytenr, num_bytes, parent, ref_root, |
| 735 | ref_generation, owner_objectid, |
| 736 | BTRFS_ADD_DELAYED_REF, 0); |
| 737 | BUG_ON(ret); |
| 738 | return ret; |
| 739 | } |
| 740 | |
| 741 | static noinline_for_stack int add_extent_ref(struct btrfs_trans_handle *trans, |
| 742 | struct btrfs_root *root, u64 bytenr, |
| 743 | u64 num_bytes, u64 parent, u64 ref_root, |
| 744 | u64 ref_generation, u64 owner_objectid, |
| 745 | int refs_to_add) |
| 746 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 747 | struct btrfs_path *path; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 748 | int ret; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 749 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 750 | struct extent_buffer *l; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 751 | struct btrfs_extent_item *item; |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 752 | u32 refs; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 753 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 754 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 755 | if (!path) |
| 756 | return -ENOMEM; |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 757 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 758 | path->reada = 1; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 759 | path->leave_spinning = 1; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 760 | key.objectid = bytenr; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 761 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 762 | key.offset = num_bytes; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 763 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 764 | /* first find the extent item and update its reference count */ |
| 765 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, |
| 766 | path, 0, 1); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 767 | if (ret < 0) { |
| 768 | btrfs_set_path_blocking(path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 769 | return ret; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 770 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 771 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 772 | if (ret > 0) { |
| 773 | WARN_ON(1); |
| 774 | btrfs_free_path(path); |
| 775 | return -EIO; |
| 776 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 777 | l = path->nodes[0]; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 778 | |
| 779 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 780 | if (key.objectid != bytenr) { |
| 781 | btrfs_print_leaf(root->fs_info->extent_root, path->nodes[0]); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 782 | printk(KERN_ERR "btrfs wanted %llu found %llu\n", |
| 783 | (unsigned long long)bytenr, |
| 784 | (unsigned long long)key.objectid); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 785 | BUG(); |
| 786 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 787 | BUG_ON(key.type != BTRFS_EXTENT_ITEM_KEY); |
| 788 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 789 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 790 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 791 | refs = btrfs_extent_refs(l, item); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 792 | btrfs_set_extent_refs(l, item, refs + refs_to_add); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 793 | btrfs_unlock_up_safe(path, 1); |
| 794 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 795 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 796 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 797 | btrfs_release_path(root->fs_info->extent_root, path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 798 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 799 | path->reada = 1; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 800 | path->leave_spinning = 1; |
| 801 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 802 | /* now insert the actual backref */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 803 | ret = insert_extent_backref(trans, root->fs_info->extent_root, |
| 804 | path, bytenr, parent, |
| 805 | ref_root, ref_generation, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 806 | owner_objectid, refs_to_add); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 807 | BUG_ON(ret); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 808 | btrfs_free_path(path); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 809 | return 0; |
| 810 | } |
| 811 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 812 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 813 | struct btrfs_root *root, |
| 814 | u64 bytenr, u64 num_bytes, u64 parent, |
| 815 | u64 ref_root, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 816 | u64 owner_objectid) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 817 | { |
| 818 | int ret; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 819 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && |
| 820 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) |
| 821 | return 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 822 | |
| 823 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0, parent, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 824 | 0, ref_root, 0, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 825 | owner_objectid); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 826 | return ret; |
| 827 | } |
| 828 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 829 | static int drop_delayed_ref(struct btrfs_trans_handle *trans, |
| 830 | struct btrfs_root *root, |
| 831 | struct btrfs_delayed_ref_node *node) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 832 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 833 | int ret = 0; |
| 834 | struct btrfs_delayed_ref *ref = btrfs_delayed_node_to_ref(node); |
| 835 | |
| 836 | BUG_ON(node->ref_mod == 0); |
| 837 | ret = __btrfs_free_extent(trans, root, node->bytenr, node->num_bytes, |
| 838 | node->parent, ref->root, ref->generation, |
| 839 | ref->owner_objectid, ref->pin, node->ref_mod); |
| 840 | |
| 841 | return ret; |
| 842 | } |
| 843 | |
| 844 | /* helper function to actually process a single delayed ref entry */ |
| 845 | static noinline int run_one_delayed_ref(struct btrfs_trans_handle *trans, |
| 846 | struct btrfs_root *root, |
| 847 | struct btrfs_delayed_ref_node *node, |
| 848 | int insert_reserved) |
| 849 | { |
Josef Bacik | eb09967 | 2009-02-12 09:27:38 -0500 | [diff] [blame] | 850 | int ret; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 851 | struct btrfs_delayed_ref *ref; |
Josef Bacik | eb09967 | 2009-02-12 09:27:38 -0500 | [diff] [blame] | 852 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 853 | if (node->parent == (u64)-1) { |
| 854 | struct btrfs_delayed_ref_head *head; |
| 855 | /* |
| 856 | * we've hit the end of the chain and we were supposed |
| 857 | * to insert this extent into the tree. But, it got |
| 858 | * deleted before we ever needed to insert it, so all |
| 859 | * we have to do is clean up the accounting |
| 860 | */ |
| 861 | if (insert_reserved) { |
| 862 | update_reserved_extents(root, node->bytenr, |
| 863 | node->num_bytes, 0); |
| 864 | } |
| 865 | head = btrfs_delayed_node_to_head(node); |
| 866 | mutex_unlock(&head->mutex); |
| 867 | return 0; |
| 868 | } |
Josef Bacik | eb09967 | 2009-02-12 09:27:38 -0500 | [diff] [blame] | 869 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 870 | ref = btrfs_delayed_node_to_ref(node); |
| 871 | if (ref->action == BTRFS_ADD_DELAYED_REF) { |
| 872 | if (insert_reserved) { |
| 873 | struct btrfs_key ins; |
| 874 | |
| 875 | ins.objectid = node->bytenr; |
| 876 | ins.offset = node->num_bytes; |
| 877 | ins.type = BTRFS_EXTENT_ITEM_KEY; |
| 878 | |
| 879 | /* record the full extent allocation */ |
| 880 | ret = __btrfs_alloc_reserved_extent(trans, root, |
| 881 | node->parent, ref->root, |
| 882 | ref->generation, ref->owner_objectid, |
| 883 | &ins, node->ref_mod); |
| 884 | update_reserved_extents(root, node->bytenr, |
| 885 | node->num_bytes, 0); |
| 886 | } else { |
| 887 | /* just add one backref */ |
| 888 | ret = add_extent_ref(trans, root, node->bytenr, |
| 889 | node->num_bytes, |
| 890 | node->parent, ref->root, ref->generation, |
| 891 | ref->owner_objectid, node->ref_mod); |
| 892 | } |
| 893 | BUG_ON(ret); |
| 894 | } else if (ref->action == BTRFS_DROP_DELAYED_REF) { |
| 895 | WARN_ON(insert_reserved); |
| 896 | ret = drop_delayed_ref(trans, root, node); |
Josef Bacik | eb09967 | 2009-02-12 09:27:38 -0500 | [diff] [blame] | 897 | } |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 898 | return 0; |
| 899 | } |
| 900 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 901 | static noinline struct btrfs_delayed_ref_node * |
| 902 | select_delayed_ref(struct btrfs_delayed_ref_head *head) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 903 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 904 | struct rb_node *node; |
| 905 | struct btrfs_delayed_ref_node *ref; |
| 906 | int action = BTRFS_ADD_DELAYED_REF; |
| 907 | again: |
| 908 | /* |
| 909 | * select delayed ref of type BTRFS_ADD_DELAYED_REF first. |
| 910 | * this prevents ref count from going down to zero when |
| 911 | * there still are pending delayed ref. |
| 912 | */ |
| 913 | node = rb_prev(&head->node.rb_node); |
| 914 | while (1) { |
| 915 | if (!node) |
| 916 | break; |
| 917 | ref = rb_entry(node, struct btrfs_delayed_ref_node, |
| 918 | rb_node); |
| 919 | if (ref->bytenr != head->node.bytenr) |
| 920 | break; |
| 921 | if (btrfs_delayed_node_to_ref(ref)->action == action) |
| 922 | return ref; |
| 923 | node = rb_prev(node); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 924 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 925 | if (action == BTRFS_ADD_DELAYED_REF) { |
| 926 | action = BTRFS_DROP_DELAYED_REF; |
| 927 | goto again; |
| 928 | } |
| 929 | return NULL; |
| 930 | } |
| 931 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 932 | static noinline int run_clustered_refs(struct btrfs_trans_handle *trans, |
| 933 | struct btrfs_root *root, |
| 934 | struct list_head *cluster) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 935 | { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 936 | struct btrfs_delayed_ref_root *delayed_refs; |
| 937 | struct btrfs_delayed_ref_node *ref; |
| 938 | struct btrfs_delayed_ref_head *locked_ref = NULL; |
| 939 | int ret; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 940 | int count = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 941 | int must_insert_reserved = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 942 | |
| 943 | delayed_refs = &trans->transaction->delayed_refs; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 944 | while (1) { |
| 945 | if (!locked_ref) { |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 946 | /* pick a new head ref from the cluster list */ |
| 947 | if (list_empty(cluster)) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 948 | break; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 949 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 950 | locked_ref = list_entry(cluster->next, |
| 951 | struct btrfs_delayed_ref_head, cluster); |
| 952 | |
| 953 | /* grab the lock that says we are going to process |
| 954 | * all the refs for this head */ |
| 955 | ret = btrfs_delayed_ref_lock(trans, locked_ref); |
| 956 | |
| 957 | /* |
| 958 | * we may have dropped the spin lock to get the head |
| 959 | * mutex lock, and that might have given someone else |
| 960 | * time to free the head. If that's true, it has been |
| 961 | * removed from our list and we can move on. |
| 962 | */ |
| 963 | if (ret == -EAGAIN) { |
| 964 | locked_ref = NULL; |
| 965 | count++; |
| 966 | continue; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 967 | } |
| 968 | } |
| 969 | |
| 970 | /* |
| 971 | * record the must insert reserved flag before we |
| 972 | * drop the spin lock. |
| 973 | */ |
| 974 | must_insert_reserved = locked_ref->must_insert_reserved; |
| 975 | locked_ref->must_insert_reserved = 0; |
| 976 | |
| 977 | /* |
| 978 | * locked_ref is the head node, so we have to go one |
| 979 | * node back for any delayed ref updates |
| 980 | */ |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 981 | ref = select_delayed_ref(locked_ref); |
| 982 | if (!ref) { |
| 983 | /* All delayed refs have been processed, Go ahead |
| 984 | * and send the head node to run_one_delayed_ref, |
| 985 | * so that any accounting fixes can happen |
| 986 | */ |
| 987 | ref = &locked_ref->node; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 988 | list_del_init(&locked_ref->cluster); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 989 | locked_ref = NULL; |
| 990 | } |
| 991 | |
| 992 | ref->in_tree = 0; |
| 993 | rb_erase(&ref->rb_node, &delayed_refs->root); |
| 994 | delayed_refs->num_entries--; |
| 995 | spin_unlock(&delayed_refs->lock); |
| 996 | |
| 997 | ret = run_one_delayed_ref(trans, root, ref, |
| 998 | must_insert_reserved); |
| 999 | BUG_ON(ret); |
| 1000 | btrfs_put_delayed_ref(ref); |
| 1001 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 1002 | count++; |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 1003 | cond_resched(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1004 | spin_lock(&delayed_refs->lock); |
| 1005 | } |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 1006 | return count; |
| 1007 | } |
| 1008 | |
| 1009 | /* |
| 1010 | * this starts processing the delayed reference count updates and |
| 1011 | * extent insertions we have queued up so far. count can be |
| 1012 | * 0, which means to process everything in the tree at the start |
| 1013 | * of the run (but not newly added entries), or it can be some target |
| 1014 | * number you'd like to process. |
| 1015 | */ |
| 1016 | int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, |
| 1017 | struct btrfs_root *root, unsigned long count) |
| 1018 | { |
| 1019 | struct rb_node *node; |
| 1020 | struct btrfs_delayed_ref_root *delayed_refs; |
| 1021 | struct btrfs_delayed_ref_node *ref; |
| 1022 | struct list_head cluster; |
| 1023 | int ret; |
| 1024 | int run_all = count == (unsigned long)-1; |
| 1025 | int run_most = 0; |
| 1026 | |
| 1027 | if (root == root->fs_info->extent_root) |
| 1028 | root = root->fs_info->tree_root; |
| 1029 | |
| 1030 | delayed_refs = &trans->transaction->delayed_refs; |
| 1031 | INIT_LIST_HEAD(&cluster); |
| 1032 | again: |
| 1033 | spin_lock(&delayed_refs->lock); |
| 1034 | if (count == 0) { |
| 1035 | count = delayed_refs->num_entries * 2; |
| 1036 | run_most = 1; |
| 1037 | } |
| 1038 | while (1) { |
| 1039 | if (!(run_all || run_most) && |
| 1040 | delayed_refs->num_heads_ready < 64) |
| 1041 | break; |
| 1042 | |
| 1043 | /* |
| 1044 | * go find something we can process in the rbtree. We start at |
| 1045 | * the beginning of the tree, and then build a cluster |
| 1046 | * of refs to process starting at the first one we are able to |
| 1047 | * lock |
| 1048 | */ |
| 1049 | ret = btrfs_find_ref_cluster(trans, &cluster, |
| 1050 | delayed_refs->run_delayed_start); |
| 1051 | if (ret) |
| 1052 | break; |
| 1053 | |
| 1054 | ret = run_clustered_refs(trans, root, &cluster); |
| 1055 | BUG_ON(ret < 0); |
| 1056 | |
| 1057 | count -= min_t(unsigned long, ret, count); |
| 1058 | |
| 1059 | if (count == 0) |
| 1060 | break; |
| 1061 | } |
| 1062 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1063 | if (run_all) { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1064 | node = rb_first(&delayed_refs->root); |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 1065 | if (!node) |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1066 | goto out; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 1067 | count = (unsigned long)-1; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1068 | |
| 1069 | while (node) { |
| 1070 | ref = rb_entry(node, struct btrfs_delayed_ref_node, |
| 1071 | rb_node); |
| 1072 | if (btrfs_delayed_ref_is_head(ref)) { |
| 1073 | struct btrfs_delayed_ref_head *head; |
| 1074 | |
| 1075 | head = btrfs_delayed_node_to_head(ref); |
| 1076 | atomic_inc(&ref->refs); |
| 1077 | |
| 1078 | spin_unlock(&delayed_refs->lock); |
| 1079 | mutex_lock(&head->mutex); |
| 1080 | mutex_unlock(&head->mutex); |
| 1081 | |
| 1082 | btrfs_put_delayed_ref(ref); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 1083 | cond_resched(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1084 | goto again; |
| 1085 | } |
| 1086 | node = rb_next(node); |
| 1087 | } |
| 1088 | spin_unlock(&delayed_refs->lock); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1089 | schedule_timeout(1); |
| 1090 | goto again; |
| 1091 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1092 | out: |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 1093 | spin_unlock(&delayed_refs->lock); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1094 | return 0; |
| 1095 | } |
| 1096 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1097 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1098 | struct btrfs_root *root, u64 objectid, u64 bytenr) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1099 | { |
| 1100 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
| 1101 | struct btrfs_path *path; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1102 | struct extent_buffer *leaf; |
| 1103 | struct btrfs_extent_ref *ref_item; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1104 | struct btrfs_key key; |
| 1105 | struct btrfs_key found_key; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1106 | u64 ref_root; |
| 1107 | u64 last_snapshot; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1108 | u32 nritems; |
| 1109 | int ret; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1110 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1111 | key.objectid = bytenr; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1112 | key.offset = (u64)-1; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1113 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1114 | |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1115 | path = btrfs_alloc_path(); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1116 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
| 1117 | if (ret < 0) |
| 1118 | goto out; |
| 1119 | BUG_ON(ret == 0); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1120 | |
| 1121 | ret = -ENOENT; |
| 1122 | if (path->slots[0] == 0) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1123 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1124 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1125 | path->slots[0]--; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1126 | leaf = path->nodes[0]; |
| 1127 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1128 | |
| 1129 | if (found_key.objectid != bytenr || |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1130 | found_key.type != BTRFS_EXTENT_ITEM_KEY) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1131 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1132 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1133 | last_snapshot = btrfs_root_last_snapshot(&root->root_item); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1134 | while (1) { |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1135 | leaf = path->nodes[0]; |
| 1136 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1137 | if (path->slots[0] >= nritems) { |
| 1138 | ret = btrfs_next_leaf(extent_root, path); |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1139 | if (ret < 0) |
| 1140 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1141 | if (ret == 0) |
| 1142 | continue; |
| 1143 | break; |
| 1144 | } |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1145 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1146 | if (found_key.objectid != bytenr) |
| 1147 | break; |
Chris Mason | bd09835 | 2008-01-03 13:23:19 -0500 | [diff] [blame] | 1148 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1149 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
| 1150 | path->slots[0]++; |
| 1151 | continue; |
| 1152 | } |
| 1153 | |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1154 | ref_item = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1155 | struct btrfs_extent_ref); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1156 | ref_root = btrfs_ref_root(leaf, ref_item); |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1157 | if ((ref_root != root->root_key.objectid && |
| 1158 | ref_root != BTRFS_TREE_LOG_OBJECTID) || |
| 1159 | objectid != btrfs_ref_objectid(leaf, ref_item)) { |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1160 | ret = 1; |
| 1161 | goto out; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1162 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1163 | if (btrfs_ref_generation(leaf, ref_item) <= last_snapshot) { |
| 1164 | ret = 1; |
| 1165 | goto out; |
| 1166 | } |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1167 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1168 | path->slots[0]++; |
| 1169 | } |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1170 | ret = 0; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1171 | out: |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1172 | btrfs_free_path(path); |
| 1173 | return ret; |
| 1174 | } |
| 1175 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1176 | int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 1177 | struct extent_buffer *buf, u32 nr_extents) |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1178 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1179 | struct btrfs_key key; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 1180 | struct btrfs_file_extent_item *fi; |
Zheng Yan | e465768 | 2008-09-26 10:04:53 -0400 | [diff] [blame] | 1181 | u64 root_gen; |
| 1182 | u32 nritems; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1183 | int i; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1184 | int level; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1185 | int ret = 0; |
Zheng Yan | e465768 | 2008-09-26 10:04:53 -0400 | [diff] [blame] | 1186 | int shared = 0; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1187 | |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 1188 | if (!root->ref_cows) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1189 | return 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1190 | |
Zheng Yan | e465768 | 2008-09-26 10:04:53 -0400 | [diff] [blame] | 1191 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
| 1192 | shared = 0; |
| 1193 | root_gen = root->root_key.offset; |
| 1194 | } else { |
| 1195 | shared = 1; |
| 1196 | root_gen = trans->transid - 1; |
| 1197 | } |
| 1198 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1199 | level = btrfs_header_level(buf); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1200 | nritems = btrfs_header_nritems(buf); |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1201 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1202 | if (level == 0) { |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1203 | struct btrfs_leaf_ref *ref; |
| 1204 | struct btrfs_extent_info *info; |
| 1205 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1206 | ref = btrfs_alloc_leaf_ref(root, nr_extents); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1207 | if (!ref) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1208 | ret = -ENOMEM; |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1209 | goto out; |
| 1210 | } |
| 1211 | |
Zheng Yan | e465768 | 2008-09-26 10:04:53 -0400 | [diff] [blame] | 1212 | ref->root_gen = root_gen; |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1213 | ref->bytenr = buf->start; |
| 1214 | ref->owner = btrfs_header_owner(buf); |
| 1215 | ref->generation = btrfs_header_generation(buf); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1216 | ref->nritems = nr_extents; |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1217 | info = ref->extents; |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1218 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1219 | for (i = 0; nr_extents > 0 && i < nritems; i++) { |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1220 | u64 disk_bytenr; |
| 1221 | btrfs_item_key_to_cpu(buf, &key, i); |
| 1222 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
| 1223 | continue; |
| 1224 | fi = btrfs_item_ptr(buf, i, |
| 1225 | struct btrfs_file_extent_item); |
| 1226 | if (btrfs_file_extent_type(buf, fi) == |
| 1227 | BTRFS_FILE_EXTENT_INLINE) |
| 1228 | continue; |
| 1229 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
| 1230 | if (disk_bytenr == 0) |
| 1231 | continue; |
| 1232 | |
| 1233 | info->bytenr = disk_bytenr; |
| 1234 | info->num_bytes = |
| 1235 | btrfs_file_extent_disk_num_bytes(buf, fi); |
| 1236 | info->objectid = key.objectid; |
| 1237 | info->offset = key.offset; |
| 1238 | info++; |
| 1239 | } |
| 1240 | |
Zheng Yan | e465768 | 2008-09-26 10:04:53 -0400 | [diff] [blame] | 1241 | ret = btrfs_add_leaf_ref(root, ref, shared); |
Yan Zheng | 5b84e8d | 2008-10-09 11:46:19 -0400 | [diff] [blame] | 1242 | if (ret == -EEXIST && shared) { |
| 1243 | struct btrfs_leaf_ref *old; |
| 1244 | old = btrfs_lookup_leaf_ref(root, ref->bytenr); |
| 1245 | BUG_ON(!old); |
| 1246 | btrfs_remove_leaf_ref(root, old); |
| 1247 | btrfs_free_leaf_ref(root, old); |
| 1248 | ret = btrfs_add_leaf_ref(root, ref, shared); |
| 1249 | } |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1250 | WARN_ON(ret); |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1251 | btrfs_free_leaf_ref(root, ref); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1252 | } |
| 1253 | out: |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1254 | return ret; |
| 1255 | } |
| 1256 | |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1257 | /* when a block goes through cow, we update the reference counts of |
| 1258 | * everything that block points to. The internal pointers of the block |
| 1259 | * can be in just about any order, and it is likely to have clusters of |
| 1260 | * things that are close together and clusters of things that are not. |
| 1261 | * |
| 1262 | * To help reduce the seeks that come with updating all of these reference |
| 1263 | * counts, sort them by byte number before actual updates are done. |
| 1264 | * |
| 1265 | * struct refsort is used to match byte number to slot in the btree block. |
| 1266 | * we sort based on the byte number and then use the slot to actually |
| 1267 | * find the item. |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 1268 | * |
| 1269 | * struct refsort is smaller than strcut btrfs_item and smaller than |
| 1270 | * struct btrfs_key_ptr. Since we're currently limited to the page size |
| 1271 | * for a btree block, there's no way for a kmalloc of refsorts for a |
| 1272 | * single node to be bigger than a page. |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1273 | */ |
| 1274 | struct refsort { |
| 1275 | u64 bytenr; |
| 1276 | u32 slot; |
| 1277 | }; |
| 1278 | |
| 1279 | /* |
| 1280 | * for passing into sort() |
| 1281 | */ |
| 1282 | static int refsort_cmp(const void *a_void, const void *b_void) |
| 1283 | { |
| 1284 | const struct refsort *a = a_void; |
| 1285 | const struct refsort *b = b_void; |
| 1286 | |
| 1287 | if (a->bytenr < b->bytenr) |
| 1288 | return -1; |
| 1289 | if (a->bytenr > b->bytenr) |
| 1290 | return 1; |
| 1291 | return 0; |
| 1292 | } |
| 1293 | |
| 1294 | |
| 1295 | noinline int btrfs_inc_ref(struct btrfs_trans_handle *trans, |
| 1296 | struct btrfs_root *root, |
| 1297 | struct extent_buffer *orig_buf, |
| 1298 | struct extent_buffer *buf, u32 *nr_extents) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1299 | { |
| 1300 | u64 bytenr; |
| 1301 | u64 ref_root; |
| 1302 | u64 orig_root; |
| 1303 | u64 ref_generation; |
| 1304 | u64 orig_generation; |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1305 | struct refsort *sorted; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1306 | u32 nritems; |
| 1307 | u32 nr_file_extents = 0; |
| 1308 | struct btrfs_key key; |
| 1309 | struct btrfs_file_extent_item *fi; |
| 1310 | int i; |
| 1311 | int level; |
| 1312 | int ret = 0; |
| 1313 | int faili = 0; |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1314 | int refi = 0; |
| 1315 | int slot; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1316 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1317 | u64, u64, u64, u64, u64, u64, u64, u64, u64); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1318 | |
| 1319 | ref_root = btrfs_header_owner(buf); |
| 1320 | ref_generation = btrfs_header_generation(buf); |
| 1321 | orig_root = btrfs_header_owner(orig_buf); |
| 1322 | orig_generation = btrfs_header_generation(orig_buf); |
| 1323 | |
| 1324 | nritems = btrfs_header_nritems(buf); |
| 1325 | level = btrfs_header_level(buf); |
| 1326 | |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1327 | sorted = kmalloc(sizeof(struct refsort) * nritems, GFP_NOFS); |
| 1328 | BUG_ON(!sorted); |
| 1329 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1330 | if (root->ref_cows) { |
| 1331 | process_func = __btrfs_inc_extent_ref; |
| 1332 | } else { |
| 1333 | if (level == 0 && |
| 1334 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
| 1335 | goto out; |
| 1336 | if (level != 0 && |
| 1337 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) |
| 1338 | goto out; |
| 1339 | process_func = __btrfs_update_extent_ref; |
| 1340 | } |
| 1341 | |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1342 | /* |
| 1343 | * we make two passes through the items. In the first pass we |
| 1344 | * only record the byte number and slot. Then we sort based on |
| 1345 | * byte number and do the actual work based on the sorted results |
| 1346 | */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1347 | for (i = 0; i < nritems; i++) { |
| 1348 | cond_resched(); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1349 | if (level == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1350 | btrfs_item_key_to_cpu(buf, &key, i); |
| 1351 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1352 | continue; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1353 | fi = btrfs_item_ptr(buf, i, |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1354 | struct btrfs_file_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1355 | if (btrfs_file_extent_type(buf, fi) == |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1356 | BTRFS_FILE_EXTENT_INLINE) |
| 1357 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1358 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
| 1359 | if (bytenr == 0) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1360 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1361 | |
| 1362 | nr_file_extents++; |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1363 | sorted[refi].bytenr = bytenr; |
| 1364 | sorted[refi].slot = i; |
| 1365 | refi++; |
| 1366 | } else { |
| 1367 | bytenr = btrfs_node_blockptr(buf, i); |
| 1368 | sorted[refi].bytenr = bytenr; |
| 1369 | sorted[refi].slot = i; |
| 1370 | refi++; |
| 1371 | } |
| 1372 | } |
| 1373 | /* |
| 1374 | * if refi == 0, we didn't actually put anything into the sorted |
| 1375 | * array and we're done |
| 1376 | */ |
| 1377 | if (refi == 0) |
| 1378 | goto out; |
| 1379 | |
| 1380 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); |
| 1381 | |
| 1382 | for (i = 0; i < refi; i++) { |
| 1383 | cond_resched(); |
| 1384 | slot = sorted[i].slot; |
| 1385 | bytenr = sorted[i].bytenr; |
| 1386 | |
| 1387 | if (level == 0) { |
| 1388 | btrfs_item_key_to_cpu(buf, &key, slot); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1389 | fi = btrfs_item_ptr(buf, slot, |
| 1390 | struct btrfs_file_extent_item); |
| 1391 | |
| 1392 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
| 1393 | if (bytenr == 0) |
| 1394 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1395 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1396 | ret = process_func(trans, root, bytenr, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1397 | btrfs_file_extent_disk_num_bytes(buf, fi), |
| 1398 | orig_buf->start, buf->start, |
| 1399 | orig_root, ref_root, |
| 1400 | orig_generation, ref_generation, |
| 1401 | key.objectid); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1402 | |
| 1403 | if (ret) { |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1404 | faili = slot; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1405 | WARN_ON(1); |
| 1406 | goto fail; |
| 1407 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1408 | } else { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1409 | ret = process_func(trans, root, bytenr, buf->len, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1410 | orig_buf->start, buf->start, |
| 1411 | orig_root, ref_root, |
| 1412 | orig_generation, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1413 | level - 1); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1414 | if (ret) { |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1415 | faili = slot; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1416 | WARN_ON(1); |
| 1417 | goto fail; |
| 1418 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1419 | } |
| 1420 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1421 | out: |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1422 | kfree(sorted); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1423 | if (nr_extents) { |
| 1424 | if (level == 0) |
| 1425 | *nr_extents = nr_file_extents; |
| 1426 | else |
| 1427 | *nr_extents = nritems; |
| 1428 | } |
| 1429 | return 0; |
| 1430 | fail: |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1431 | kfree(sorted); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1432 | WARN_ON(1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1433 | return ret; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1434 | } |
| 1435 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1436 | int btrfs_update_ref(struct btrfs_trans_handle *trans, |
| 1437 | struct btrfs_root *root, struct extent_buffer *orig_buf, |
| 1438 | struct extent_buffer *buf, int start_slot, int nr) |
| 1439 | |
| 1440 | { |
| 1441 | u64 bytenr; |
| 1442 | u64 ref_root; |
| 1443 | u64 orig_root; |
| 1444 | u64 ref_generation; |
| 1445 | u64 orig_generation; |
| 1446 | struct btrfs_key key; |
| 1447 | struct btrfs_file_extent_item *fi; |
| 1448 | int i; |
| 1449 | int ret; |
| 1450 | int slot; |
| 1451 | int level; |
| 1452 | |
| 1453 | BUG_ON(start_slot < 0); |
| 1454 | BUG_ON(start_slot + nr > btrfs_header_nritems(buf)); |
| 1455 | |
| 1456 | ref_root = btrfs_header_owner(buf); |
| 1457 | ref_generation = btrfs_header_generation(buf); |
| 1458 | orig_root = btrfs_header_owner(orig_buf); |
| 1459 | orig_generation = btrfs_header_generation(orig_buf); |
| 1460 | level = btrfs_header_level(buf); |
| 1461 | |
| 1462 | if (!root->ref_cows) { |
| 1463 | if (level == 0 && |
| 1464 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
| 1465 | return 0; |
| 1466 | if (level != 0 && |
| 1467 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) |
| 1468 | return 0; |
| 1469 | } |
| 1470 | |
| 1471 | for (i = 0, slot = start_slot; i < nr; i++, slot++) { |
| 1472 | cond_resched(); |
| 1473 | if (level == 0) { |
| 1474 | btrfs_item_key_to_cpu(buf, &key, slot); |
| 1475 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
| 1476 | continue; |
| 1477 | fi = btrfs_item_ptr(buf, slot, |
| 1478 | struct btrfs_file_extent_item); |
| 1479 | if (btrfs_file_extent_type(buf, fi) == |
| 1480 | BTRFS_FILE_EXTENT_INLINE) |
| 1481 | continue; |
| 1482 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
| 1483 | if (bytenr == 0) |
| 1484 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1485 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1486 | btrfs_file_extent_disk_num_bytes(buf, fi), |
| 1487 | orig_buf->start, buf->start, |
| 1488 | orig_root, ref_root, orig_generation, |
| 1489 | ref_generation, key.objectid); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1490 | if (ret) |
| 1491 | goto fail; |
| 1492 | } else { |
| 1493 | bytenr = btrfs_node_blockptr(buf, slot); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1494 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1495 | buf->len, orig_buf->start, |
| 1496 | buf->start, orig_root, ref_root, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1497 | orig_generation, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1498 | level - 1); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1499 | if (ret) |
| 1500 | goto fail; |
| 1501 | } |
| 1502 | } |
| 1503 | return 0; |
| 1504 | fail: |
| 1505 | WARN_ON(1); |
| 1506 | return -1; |
| 1507 | } |
| 1508 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1509 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
| 1510 | struct btrfs_root *root, |
| 1511 | struct btrfs_path *path, |
| 1512 | struct btrfs_block_group_cache *cache) |
| 1513 | { |
| 1514 | int ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1515 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1516 | unsigned long bi; |
| 1517 | struct extent_buffer *leaf; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1518 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1519 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1520 | if (ret < 0) |
| 1521 | goto fail; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1522 | BUG_ON(ret); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1523 | |
| 1524 | leaf = path->nodes[0]; |
| 1525 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 1526 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); |
| 1527 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1528 | btrfs_release_path(extent_root, path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1529 | fail: |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1530 | if (ret) |
| 1531 | return ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1532 | return 0; |
| 1533 | |
| 1534 | } |
| 1535 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1536 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
| 1537 | struct btrfs_root *root) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1538 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1539 | struct btrfs_block_group_cache *cache, *entry; |
| 1540 | struct rb_node *n; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1541 | int err = 0; |
| 1542 | int werr = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1543 | struct btrfs_path *path; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1544 | u64 last = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1545 | |
| 1546 | path = btrfs_alloc_path(); |
| 1547 | if (!path) |
| 1548 | return -ENOMEM; |
| 1549 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1550 | while (1) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1551 | cache = NULL; |
| 1552 | spin_lock(&root->fs_info->block_group_cache_lock); |
| 1553 | for (n = rb_first(&root->fs_info->block_group_cache_tree); |
| 1554 | n; n = rb_next(n)) { |
| 1555 | entry = rb_entry(n, struct btrfs_block_group_cache, |
| 1556 | cache_node); |
| 1557 | if (entry->dirty) { |
| 1558 | cache = entry; |
| 1559 | break; |
| 1560 | } |
| 1561 | } |
| 1562 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 1563 | |
| 1564 | if (!cache) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1565 | break; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1566 | |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 1567 | cache->dirty = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1568 | last += cache->key.offset; |
| 1569 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1570 | err = write_one_cache_group(trans, root, |
| 1571 | path, cache); |
| 1572 | /* |
| 1573 | * if we fail to write the cache group, we want |
| 1574 | * to keep it marked dirty in hopes that a later |
| 1575 | * write will work |
| 1576 | */ |
| 1577 | if (err) { |
| 1578 | werr = err; |
| 1579 | continue; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1580 | } |
| 1581 | } |
| 1582 | btrfs_free_path(path); |
| 1583 | return werr; |
| 1584 | } |
| 1585 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 1586 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
| 1587 | { |
| 1588 | struct btrfs_block_group_cache *block_group; |
| 1589 | int readonly = 0; |
| 1590 | |
| 1591 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
| 1592 | if (!block_group || block_group->ro) |
| 1593 | readonly = 1; |
| 1594 | if (block_group) |
| 1595 | put_block_group(block_group); |
| 1596 | return readonly; |
| 1597 | } |
| 1598 | |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1599 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
| 1600 | u64 total_bytes, u64 bytes_used, |
| 1601 | struct btrfs_space_info **space_info) |
| 1602 | { |
| 1603 | struct btrfs_space_info *found; |
| 1604 | |
| 1605 | found = __find_space_info(info, flags); |
| 1606 | if (found) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1607 | spin_lock(&found->lock); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1608 | found->total_bytes += total_bytes; |
| 1609 | found->bytes_used += bytes_used; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1610 | found->full = 0; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1611 | spin_unlock(&found->lock); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1612 | *space_info = found; |
| 1613 | return 0; |
| 1614 | } |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1615 | found = kzalloc(sizeof(*found), GFP_NOFS); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1616 | if (!found) |
| 1617 | return -ENOMEM; |
| 1618 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1619 | INIT_LIST_HEAD(&found->block_groups); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1620 | init_rwsem(&found->groups_sem); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1621 | spin_lock_init(&found->lock); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1622 | found->flags = flags; |
| 1623 | found->total_bytes = total_bytes; |
| 1624 | found->bytes_used = bytes_used; |
| 1625 | found->bytes_pinned = 0; |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 1626 | found->bytes_reserved = 0; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1627 | found->bytes_readonly = 0; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1628 | found->bytes_delalloc = 0; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1629 | found->full = 0; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1630 | found->force_alloc = 0; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1631 | *space_info = found; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 1632 | list_add_rcu(&found->list, &info->space_info); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1633 | return 0; |
| 1634 | } |
| 1635 | |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1636 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
| 1637 | { |
| 1638 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | |
Chris Mason | 611f0e0 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1639 | BTRFS_BLOCK_GROUP_RAID1 | |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 1640 | BTRFS_BLOCK_GROUP_RAID10 | |
Chris Mason | 611f0e0 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1641 | BTRFS_BLOCK_GROUP_DUP); |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1642 | if (extra_flags) { |
| 1643 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 1644 | fs_info->avail_data_alloc_bits |= extra_flags; |
| 1645 | if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 1646 | fs_info->avail_metadata_alloc_bits |= extra_flags; |
| 1647 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 1648 | fs_info->avail_system_alloc_bits |= extra_flags; |
| 1649 | } |
| 1650 | } |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1651 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1652 | static void set_block_group_readonly(struct btrfs_block_group_cache *cache) |
| 1653 | { |
| 1654 | spin_lock(&cache->space_info->lock); |
| 1655 | spin_lock(&cache->lock); |
| 1656 | if (!cache->ro) { |
| 1657 | cache->space_info->bytes_readonly += cache->key.offset - |
| 1658 | btrfs_block_group_used(&cache->item); |
| 1659 | cache->ro = 1; |
| 1660 | } |
| 1661 | spin_unlock(&cache->lock); |
| 1662 | spin_unlock(&cache->space_info->lock); |
| 1663 | } |
| 1664 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1665 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1666 | { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1667 | u64 num_devices = root->fs_info->fs_devices->rw_devices; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1668 | |
| 1669 | if (num_devices == 1) |
| 1670 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); |
| 1671 | if (num_devices < 4) |
| 1672 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; |
| 1673 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1674 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
| 1675 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1676 | BTRFS_BLOCK_GROUP_RAID10))) { |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1677 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1678 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1679 | |
| 1680 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1681 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1682 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1683 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1684 | |
| 1685 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && |
| 1686 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | |
| 1687 | (flags & BTRFS_BLOCK_GROUP_RAID10) | |
| 1688 | (flags & BTRFS_BLOCK_GROUP_DUP))) |
| 1689 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; |
| 1690 | return flags; |
| 1691 | } |
| 1692 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1693 | static u64 btrfs_get_alloc_profile(struct btrfs_root *root, u64 data) |
| 1694 | { |
| 1695 | struct btrfs_fs_info *info = root->fs_info; |
| 1696 | u64 alloc_profile; |
| 1697 | |
| 1698 | if (data) { |
| 1699 | alloc_profile = info->avail_data_alloc_bits & |
| 1700 | info->data_alloc_profile; |
| 1701 | data = BTRFS_BLOCK_GROUP_DATA | alloc_profile; |
| 1702 | } else if (root == root->fs_info->chunk_root) { |
| 1703 | alloc_profile = info->avail_system_alloc_bits & |
| 1704 | info->system_alloc_profile; |
| 1705 | data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile; |
| 1706 | } else { |
| 1707 | alloc_profile = info->avail_metadata_alloc_bits & |
| 1708 | info->metadata_alloc_profile; |
| 1709 | data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile; |
| 1710 | } |
| 1711 | |
| 1712 | return btrfs_reduce_alloc_profile(root, data); |
| 1713 | } |
| 1714 | |
| 1715 | void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode) |
| 1716 | { |
| 1717 | u64 alloc_target; |
| 1718 | |
| 1719 | alloc_target = btrfs_get_alloc_profile(root, 1); |
| 1720 | BTRFS_I(inode)->space_info = __find_space_info(root->fs_info, |
| 1721 | alloc_target); |
| 1722 | } |
| 1723 | |
| 1724 | /* |
| 1725 | * for now this just makes sure we have at least 5% of our metadata space free |
| 1726 | * for use. |
| 1727 | */ |
| 1728 | int btrfs_check_metadata_free_space(struct btrfs_root *root) |
| 1729 | { |
| 1730 | struct btrfs_fs_info *info = root->fs_info; |
| 1731 | struct btrfs_space_info *meta_sinfo; |
| 1732 | u64 alloc_target, thresh; |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 1733 | int committed = 0, ret; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1734 | |
| 1735 | /* get the space info for where the metadata will live */ |
| 1736 | alloc_target = btrfs_get_alloc_profile(root, 0); |
| 1737 | meta_sinfo = __find_space_info(info, alloc_target); |
| 1738 | |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 1739 | again: |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1740 | spin_lock(&meta_sinfo->lock); |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 1741 | if (!meta_sinfo->full) |
| 1742 | thresh = meta_sinfo->total_bytes * 80; |
| 1743 | else |
| 1744 | thresh = meta_sinfo->total_bytes * 95; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1745 | |
| 1746 | do_div(thresh, 100); |
| 1747 | |
| 1748 | if (meta_sinfo->bytes_used + meta_sinfo->bytes_reserved + |
| 1749 | meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly > thresh) { |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 1750 | struct btrfs_trans_handle *trans; |
| 1751 | if (!meta_sinfo->full) { |
| 1752 | meta_sinfo->force_alloc = 1; |
| 1753 | spin_unlock(&meta_sinfo->lock); |
| 1754 | |
| 1755 | trans = btrfs_start_transaction(root, 1); |
| 1756 | if (!trans) |
| 1757 | return -ENOMEM; |
| 1758 | |
| 1759 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
| 1760 | 2 * 1024 * 1024, alloc_target, 0); |
| 1761 | btrfs_end_transaction(trans, root); |
| 1762 | goto again; |
| 1763 | } |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1764 | spin_unlock(&meta_sinfo->lock); |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 1765 | |
| 1766 | if (!committed) { |
| 1767 | committed = 1; |
| 1768 | trans = btrfs_join_transaction(root, 1); |
| 1769 | if (!trans) |
| 1770 | return -ENOMEM; |
| 1771 | ret = btrfs_commit_transaction(trans, root); |
| 1772 | if (ret) |
| 1773 | return ret; |
| 1774 | goto again; |
| 1775 | } |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1776 | return -ENOSPC; |
| 1777 | } |
| 1778 | spin_unlock(&meta_sinfo->lock); |
| 1779 | |
| 1780 | return 0; |
| 1781 | } |
| 1782 | |
| 1783 | /* |
| 1784 | * This will check the space that the inode allocates from to make sure we have |
| 1785 | * enough space for bytes. |
| 1786 | */ |
| 1787 | int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode, |
| 1788 | u64 bytes) |
| 1789 | { |
| 1790 | struct btrfs_space_info *data_sinfo; |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 1791 | int ret = 0, committed = 0; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1792 | |
| 1793 | /* make sure bytes are sectorsize aligned */ |
| 1794 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); |
| 1795 | |
| 1796 | data_sinfo = BTRFS_I(inode)->space_info; |
| 1797 | again: |
| 1798 | /* make sure we have enough space to handle the data first */ |
| 1799 | spin_lock(&data_sinfo->lock); |
| 1800 | if (data_sinfo->total_bytes - data_sinfo->bytes_used - |
| 1801 | data_sinfo->bytes_delalloc - data_sinfo->bytes_reserved - |
| 1802 | data_sinfo->bytes_pinned - data_sinfo->bytes_readonly - |
| 1803 | data_sinfo->bytes_may_use < bytes) { |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 1804 | struct btrfs_trans_handle *trans; |
| 1805 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1806 | /* |
| 1807 | * if we don't have enough free bytes in this space then we need |
| 1808 | * to alloc a new chunk. |
| 1809 | */ |
| 1810 | if (!data_sinfo->full) { |
| 1811 | u64 alloc_target; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1812 | |
| 1813 | data_sinfo->force_alloc = 1; |
| 1814 | spin_unlock(&data_sinfo->lock); |
| 1815 | |
| 1816 | alloc_target = btrfs_get_alloc_profile(root, 1); |
| 1817 | trans = btrfs_start_transaction(root, 1); |
| 1818 | if (!trans) |
| 1819 | return -ENOMEM; |
| 1820 | |
| 1821 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
| 1822 | bytes + 2 * 1024 * 1024, |
| 1823 | alloc_target, 0); |
| 1824 | btrfs_end_transaction(trans, root); |
| 1825 | if (ret) |
| 1826 | return ret; |
| 1827 | goto again; |
| 1828 | } |
| 1829 | spin_unlock(&data_sinfo->lock); |
Josef Bacik | 4e06bdd | 2009-02-20 10:59:53 -0500 | [diff] [blame] | 1830 | |
| 1831 | /* commit the current transaction and try again */ |
| 1832 | if (!committed) { |
| 1833 | committed = 1; |
| 1834 | trans = btrfs_join_transaction(root, 1); |
| 1835 | if (!trans) |
| 1836 | return -ENOMEM; |
| 1837 | ret = btrfs_commit_transaction(trans, root); |
| 1838 | if (ret) |
| 1839 | return ret; |
| 1840 | goto again; |
| 1841 | } |
| 1842 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1843 | printk(KERN_ERR "no space left, need %llu, %llu delalloc bytes" |
| 1844 | ", %llu bytes_used, %llu bytes_reserved, " |
| 1845 | "%llu bytes_pinned, %llu bytes_readonly, %llu may use" |
| 1846 | "%llu total\n", bytes, data_sinfo->bytes_delalloc, |
| 1847 | data_sinfo->bytes_used, data_sinfo->bytes_reserved, |
| 1848 | data_sinfo->bytes_pinned, data_sinfo->bytes_readonly, |
| 1849 | data_sinfo->bytes_may_use, data_sinfo->total_bytes); |
| 1850 | return -ENOSPC; |
| 1851 | } |
| 1852 | data_sinfo->bytes_may_use += bytes; |
| 1853 | BTRFS_I(inode)->reserved_bytes += bytes; |
| 1854 | spin_unlock(&data_sinfo->lock); |
| 1855 | |
| 1856 | return btrfs_check_metadata_free_space(root); |
| 1857 | } |
| 1858 | |
| 1859 | /* |
| 1860 | * if there was an error for whatever reason after calling |
| 1861 | * btrfs_check_data_free_space, call this so we can cleanup the counters. |
| 1862 | */ |
| 1863 | void btrfs_free_reserved_data_space(struct btrfs_root *root, |
| 1864 | struct inode *inode, u64 bytes) |
| 1865 | { |
| 1866 | struct btrfs_space_info *data_sinfo; |
| 1867 | |
| 1868 | /* make sure bytes are sectorsize aligned */ |
| 1869 | bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); |
| 1870 | |
| 1871 | data_sinfo = BTRFS_I(inode)->space_info; |
| 1872 | spin_lock(&data_sinfo->lock); |
| 1873 | data_sinfo->bytes_may_use -= bytes; |
| 1874 | BTRFS_I(inode)->reserved_bytes -= bytes; |
| 1875 | spin_unlock(&data_sinfo->lock); |
| 1876 | } |
| 1877 | |
| 1878 | /* called when we are adding a delalloc extent to the inode's io_tree */ |
| 1879 | void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode, |
| 1880 | u64 bytes) |
| 1881 | { |
| 1882 | struct btrfs_space_info *data_sinfo; |
| 1883 | |
| 1884 | /* get the space info for where this inode will be storing its data */ |
| 1885 | data_sinfo = BTRFS_I(inode)->space_info; |
| 1886 | |
| 1887 | /* make sure we have enough space to handle the data first */ |
| 1888 | spin_lock(&data_sinfo->lock); |
| 1889 | data_sinfo->bytes_delalloc += bytes; |
| 1890 | |
| 1891 | /* |
| 1892 | * we are adding a delalloc extent without calling |
| 1893 | * btrfs_check_data_free_space first. This happens on a weird |
| 1894 | * writepage condition, but shouldn't hurt our accounting |
| 1895 | */ |
| 1896 | if (unlikely(bytes > BTRFS_I(inode)->reserved_bytes)) { |
| 1897 | data_sinfo->bytes_may_use -= BTRFS_I(inode)->reserved_bytes; |
| 1898 | BTRFS_I(inode)->reserved_bytes = 0; |
| 1899 | } else { |
| 1900 | data_sinfo->bytes_may_use -= bytes; |
| 1901 | BTRFS_I(inode)->reserved_bytes -= bytes; |
| 1902 | } |
| 1903 | |
| 1904 | spin_unlock(&data_sinfo->lock); |
| 1905 | } |
| 1906 | |
| 1907 | /* called when we are clearing an delalloc extent from the inode's io_tree */ |
| 1908 | void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode, |
| 1909 | u64 bytes) |
| 1910 | { |
| 1911 | struct btrfs_space_info *info; |
| 1912 | |
| 1913 | info = BTRFS_I(inode)->space_info; |
| 1914 | |
| 1915 | spin_lock(&info->lock); |
| 1916 | info->bytes_delalloc -= bytes; |
| 1917 | spin_unlock(&info->lock); |
| 1918 | } |
| 1919 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1920 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
| 1921 | struct btrfs_root *extent_root, u64 alloc_bytes, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1922 | u64 flags, int force) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1923 | { |
| 1924 | struct btrfs_space_info *space_info; |
| 1925 | u64 thresh; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1926 | int ret = 0; |
| 1927 | |
| 1928 | mutex_lock(&extent_root->fs_info->chunk_mutex); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1929 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1930 | flags = btrfs_reduce_alloc_profile(extent_root, flags); |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1931 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1932 | space_info = __find_space_info(extent_root->fs_info, flags); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1933 | if (!space_info) { |
| 1934 | ret = update_space_info(extent_root->fs_info, flags, |
| 1935 | 0, 0, &space_info); |
| 1936 | BUG_ON(ret); |
| 1937 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1938 | BUG_ON(!space_info); |
| 1939 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1940 | spin_lock(&space_info->lock); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1941 | if (space_info->force_alloc) { |
| 1942 | force = 1; |
| 1943 | space_info->force_alloc = 0; |
| 1944 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1945 | if (space_info->full) { |
| 1946 | spin_unlock(&space_info->lock); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1947 | goto out; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1948 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1949 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1950 | thresh = space_info->total_bytes - space_info->bytes_readonly; |
| 1951 | thresh = div_factor(thresh, 6); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1952 | if (!force && |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 1953 | (space_info->bytes_used + space_info->bytes_pinned + |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1954 | space_info->bytes_reserved + alloc_bytes) < thresh) { |
| 1955 | spin_unlock(&space_info->lock); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1956 | goto out; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1957 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1958 | spin_unlock(&space_info->lock); |
| 1959 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1960 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1961 | if (ret) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1962 | space_info->full = 1; |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 1963 | out: |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1964 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1965 | return ret; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1966 | } |
| 1967 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1968 | static int update_block_group(struct btrfs_trans_handle *trans, |
| 1969 | struct btrfs_root *root, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1970 | u64 bytenr, u64 num_bytes, int alloc, |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1971 | int mark_free) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1972 | { |
| 1973 | struct btrfs_block_group_cache *cache; |
| 1974 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1975 | u64 total = num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1976 | u64 old_val; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1977 | u64 byte_in_group; |
Chris Mason | 3e1ad54 | 2007-05-07 20:03:49 -0400 | [diff] [blame] | 1978 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1979 | while (total) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1980 | cache = btrfs_lookup_block_group(info, bytenr); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 1981 | if (!cache) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1982 | return -1; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1983 | byte_in_group = bytenr - cache->key.objectid; |
| 1984 | WARN_ON(byte_in_group > cache->key.offset); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1985 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1986 | spin_lock(&cache->space_info->lock); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 1987 | spin_lock(&cache->lock); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1988 | cache->dirty = 1; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1989 | old_val = btrfs_block_group_used(&cache->item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1990 | num_bytes = min(total, cache->key.offset - byte_in_group); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 1991 | if (alloc) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1992 | old_val += num_bytes; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1993 | cache->space_info->bytes_used += num_bytes; |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 1994 | if (cache->ro) |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1995 | cache->space_info->bytes_readonly -= num_bytes; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 1996 | btrfs_set_block_group_used(&cache->item, old_val); |
| 1997 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1998 | spin_unlock(&cache->space_info->lock); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 1999 | } else { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2000 | old_val -= num_bytes; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2001 | cache->space_info->bytes_used -= num_bytes; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 2002 | if (cache->ro) |
| 2003 | cache->space_info->bytes_readonly += num_bytes; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 2004 | btrfs_set_block_group_used(&cache->item, old_val); |
| 2005 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2006 | spin_unlock(&cache->space_info->lock); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 2007 | if (mark_free) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2008 | int ret; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 2009 | |
| 2010 | ret = btrfs_discard_extent(root, bytenr, |
| 2011 | num_bytes); |
| 2012 | WARN_ON(ret); |
| 2013 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2014 | ret = btrfs_add_free_space(cache, bytenr, |
| 2015 | num_bytes); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2016 | WARN_ON(ret); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 2017 | } |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 2018 | } |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2019 | put_block_group(cache); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2020 | total -= num_bytes; |
| 2021 | bytenr += num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 2022 | } |
| 2023 | return 0; |
| 2024 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2025 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2026 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
| 2027 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2028 | struct btrfs_block_group_cache *cache; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2029 | u64 bytenr; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2030 | |
| 2031 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
| 2032 | if (!cache) |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2033 | return 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2034 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2035 | bytenr = cache->key.objectid; |
| 2036 | put_block_group(cache); |
| 2037 | |
| 2038 | return bytenr; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2039 | } |
| 2040 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2041 | int btrfs_update_pinned_extents(struct btrfs_root *root, |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2042 | u64 bytenr, u64 num, int pin) |
| 2043 | { |
| 2044 | u64 len; |
| 2045 | struct btrfs_block_group_cache *cache; |
| 2046 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2047 | |
| 2048 | if (pin) { |
| 2049 | set_extent_dirty(&fs_info->pinned_extents, |
| 2050 | bytenr, bytenr + num - 1, GFP_NOFS); |
| 2051 | } else { |
| 2052 | clear_extent_dirty(&fs_info->pinned_extents, |
| 2053 | bytenr, bytenr + num - 1, GFP_NOFS); |
| 2054 | } |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2055 | |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2056 | while (num > 0) { |
| 2057 | cache = btrfs_lookup_block_group(fs_info, bytenr); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2058 | BUG_ON(!cache); |
| 2059 | len = min(num, cache->key.offset - |
| 2060 | (bytenr - cache->key.objectid)); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2061 | if (pin) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2062 | spin_lock(&cache->space_info->lock); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2063 | spin_lock(&cache->lock); |
| 2064 | cache->pinned += len; |
| 2065 | cache->space_info->bytes_pinned += len; |
| 2066 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2067 | spin_unlock(&cache->space_info->lock); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2068 | fs_info->total_pinned += len; |
| 2069 | } else { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2070 | spin_lock(&cache->space_info->lock); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2071 | spin_lock(&cache->lock); |
| 2072 | cache->pinned -= len; |
| 2073 | cache->space_info->bytes_pinned -= len; |
| 2074 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2075 | spin_unlock(&cache->space_info->lock); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2076 | fs_info->total_pinned -= len; |
Josef Bacik | 07103a3 | 2008-11-19 15:17:55 -0500 | [diff] [blame] | 2077 | if (cache->cached) |
| 2078 | btrfs_add_free_space(cache, bytenr, len); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2079 | } |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2080 | put_block_group(cache); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2081 | bytenr += len; |
| 2082 | num -= len; |
| 2083 | } |
| 2084 | return 0; |
| 2085 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 2086 | |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2087 | static int update_reserved_extents(struct btrfs_root *root, |
| 2088 | u64 bytenr, u64 num, int reserve) |
| 2089 | { |
| 2090 | u64 len; |
| 2091 | struct btrfs_block_group_cache *cache; |
| 2092 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2093 | |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2094 | while (num > 0) { |
| 2095 | cache = btrfs_lookup_block_group(fs_info, bytenr); |
| 2096 | BUG_ON(!cache); |
| 2097 | len = min(num, cache->key.offset - |
| 2098 | (bytenr - cache->key.objectid)); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2099 | |
| 2100 | spin_lock(&cache->space_info->lock); |
| 2101 | spin_lock(&cache->lock); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2102 | if (reserve) { |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2103 | cache->reserved += len; |
| 2104 | cache->space_info->bytes_reserved += len; |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2105 | } else { |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2106 | cache->reserved -= len; |
| 2107 | cache->space_info->bytes_reserved -= len; |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2108 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2109 | spin_unlock(&cache->lock); |
| 2110 | spin_unlock(&cache->space_info->lock); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2111 | put_block_group(cache); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2112 | bytenr += len; |
| 2113 | num -= len; |
| 2114 | } |
| 2115 | return 0; |
| 2116 | } |
| 2117 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2118 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy) |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2119 | { |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2120 | u64 last = 0; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2121 | u64 start; |
| 2122 | u64 end; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2123 | struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2124 | int ret; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2125 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2126 | while (1) { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2127 | ret = find_first_extent_bit(pinned_extents, last, |
| 2128 | &start, &end, EXTENT_DIRTY); |
| 2129 | if (ret) |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2130 | break; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2131 | set_extent_dirty(copy, start, end, GFP_NOFS); |
| 2132 | last = end + 1; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2133 | } |
| 2134 | return 0; |
| 2135 | } |
| 2136 | |
| 2137 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, |
| 2138 | struct btrfs_root *root, |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2139 | struct extent_io_tree *unpin) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2140 | { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2141 | u64 start; |
| 2142 | u64 end; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2143 | int ret; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2144 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2145 | while (1) { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2146 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
| 2147 | EXTENT_DIRTY); |
| 2148 | if (ret) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2149 | break; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 2150 | |
| 2151 | ret = btrfs_discard_extent(root, start, end + 1 - start); |
| 2152 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2153 | /* unlocks the pinned mutex */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2154 | btrfs_update_pinned_extents(root, start, end + 1 - start, 0); |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2155 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 2156 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2157 | cond_resched(); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2158 | } |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 2159 | return ret; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2160 | } |
| 2161 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2162 | static int pin_down_bytes(struct btrfs_trans_handle *trans, |
| 2163 | struct btrfs_root *root, |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2164 | struct btrfs_path *path, |
| 2165 | u64 bytenr, u64 num_bytes, int is_data, |
| 2166 | struct extent_buffer **must_clean) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2167 | { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2168 | int err = 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2169 | struct extent_buffer *buf; |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 2170 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2171 | if (is_data) |
| 2172 | goto pinit; |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 2173 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2174 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); |
| 2175 | if (!buf) |
| 2176 | goto pinit; |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 2177 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2178 | /* we can reuse a block if it hasn't been written |
| 2179 | * and it is from this transaction. We can't |
| 2180 | * reuse anything from the tree log root because |
| 2181 | * it has tiny sub-transactions. |
| 2182 | */ |
| 2183 | if (btrfs_buffer_uptodate(buf, 0) && |
| 2184 | btrfs_try_tree_lock(buf)) { |
| 2185 | u64 header_owner = btrfs_header_owner(buf); |
| 2186 | u64 header_transid = btrfs_header_generation(buf); |
| 2187 | if (header_owner != BTRFS_TREE_LOG_OBJECTID && |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 2188 | header_owner != BTRFS_TREE_RELOC_OBJECTID && |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2189 | header_owner != BTRFS_DATA_RELOC_TREE_OBJECTID && |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2190 | header_transid == trans->transid && |
| 2191 | !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2192 | *must_clean = buf; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2193 | return 1; |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 2194 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2195 | btrfs_tree_unlock(buf); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 2196 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2197 | free_extent_buffer(buf); |
| 2198 | pinit: |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2199 | btrfs_set_path_blocking(path); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2200 | /* unlocks the pinned mutex */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2201 | btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); |
| 2202 | |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 2203 | BUG_ON(err < 0); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2204 | return 0; |
| 2205 | } |
| 2206 | |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2207 | /* |
| 2208 | * remove an extent from the root, returns 0 on success |
| 2209 | */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2210 | static int __free_extent(struct btrfs_trans_handle *trans, |
| 2211 | struct btrfs_root *root, |
| 2212 | u64 bytenr, u64 num_bytes, u64 parent, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2213 | u64 root_objectid, u64 ref_generation, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2214 | u64 owner_objectid, int pin, int mark_free, |
| 2215 | int refs_to_drop) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2216 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2217 | struct btrfs_path *path; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 2218 | struct btrfs_key key; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 2219 | struct btrfs_fs_info *info = root->fs_info; |
| 2220 | struct btrfs_root *extent_root = info->extent_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2221 | struct extent_buffer *leaf; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2222 | int ret; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2223 | int extent_slot = 0; |
| 2224 | int found_extent = 0; |
| 2225 | int num_to_del = 1; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 2226 | struct btrfs_extent_item *ei; |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 2227 | u32 refs; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 2228 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2229 | key.objectid = bytenr; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2230 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2231 | key.offset = num_bytes; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2232 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2233 | if (!path) |
| 2234 | return -ENOMEM; |
| 2235 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 2236 | path->reada = 1; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2237 | path->leave_spinning = 1; |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2238 | ret = lookup_extent_backref(trans, extent_root, path, |
| 2239 | bytenr, parent, root_objectid, |
| 2240 | ref_generation, owner_objectid, 1); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2241 | if (ret == 0) { |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2242 | struct btrfs_key found_key; |
| 2243 | extent_slot = path->slots[0]; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2244 | while (extent_slot > 0) { |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2245 | extent_slot--; |
| 2246 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| 2247 | extent_slot); |
| 2248 | if (found_key.objectid != bytenr) |
| 2249 | break; |
| 2250 | if (found_key.type == BTRFS_EXTENT_ITEM_KEY && |
| 2251 | found_key.offset == num_bytes) { |
| 2252 | found_extent = 1; |
| 2253 | break; |
| 2254 | } |
| 2255 | if (path->slots[0] - extent_slot > 5) |
| 2256 | break; |
| 2257 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2258 | if (!found_extent) { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2259 | ret = remove_extent_backref(trans, extent_root, path, |
| 2260 | refs_to_drop); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2261 | BUG_ON(ret); |
| 2262 | btrfs_release_path(extent_root, path); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2263 | path->leave_spinning = 1; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2264 | ret = btrfs_search_slot(trans, extent_root, |
| 2265 | &key, path, -1, 1); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2266 | if (ret) { |
| 2267 | printk(KERN_ERR "umm, got %d back from search" |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2268 | ", was looking for %llu\n", ret, |
| 2269 | (unsigned long long)bytenr); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2270 | btrfs_print_leaf(extent_root, path->nodes[0]); |
| 2271 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2272 | BUG_ON(ret); |
| 2273 | extent_slot = path->slots[0]; |
| 2274 | } |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2275 | } else { |
| 2276 | btrfs_print_leaf(extent_root, path->nodes[0]); |
| 2277 | WARN_ON(1); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2278 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2279 | "parent %llu root %llu gen %llu owner %llu\n", |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2280 | (unsigned long long)bytenr, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2281 | (unsigned long long)parent, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2282 | (unsigned long long)root_objectid, |
| 2283 | (unsigned long long)ref_generation, |
| 2284 | (unsigned long long)owner_objectid); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2285 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2286 | |
| 2287 | leaf = path->nodes[0]; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2288 | ei = btrfs_item_ptr(leaf, extent_slot, |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 2289 | struct btrfs_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2290 | refs = btrfs_extent_refs(leaf, ei); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2291 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2292 | /* |
| 2293 | * we're not allowed to delete the extent item if there |
| 2294 | * are other delayed ref updates pending |
| 2295 | */ |
| 2296 | |
| 2297 | BUG_ON(refs < refs_to_drop); |
| 2298 | refs -= refs_to_drop; |
| 2299 | btrfs_set_extent_refs(leaf, ei, refs); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2300 | btrfs_mark_buffer_dirty(leaf); |
| 2301 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2302 | if (refs == 0 && found_extent && |
| 2303 | path->slots[0] == extent_slot + 1) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2304 | struct btrfs_extent_ref *ref; |
| 2305 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 2306 | struct btrfs_extent_ref); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2307 | BUG_ON(btrfs_ref_num_refs(leaf, ref) != refs_to_drop); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2308 | /* if the back ref and the extent are next to each other |
| 2309 | * they get deleted below in one shot |
| 2310 | */ |
| 2311 | path->slots[0] = extent_slot; |
| 2312 | num_to_del = 2; |
| 2313 | } else if (found_extent) { |
| 2314 | /* otherwise delete the extent back ref */ |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2315 | ret = remove_extent_backref(trans, extent_root, path, |
| 2316 | refs_to_drop); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2317 | BUG_ON(ret); |
| 2318 | /* if refs are 0, we need to setup the path for deletion */ |
| 2319 | if (refs == 0) { |
| 2320 | btrfs_release_path(extent_root, path); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2321 | path->leave_spinning = 1; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2322 | ret = btrfs_search_slot(trans, extent_root, &key, path, |
| 2323 | -1, 1); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2324 | BUG_ON(ret); |
| 2325 | } |
| 2326 | } |
| 2327 | |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 2328 | if (refs == 0) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2329 | u64 super_used; |
| 2330 | u64 root_used; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2331 | struct extent_buffer *must_clean = NULL; |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 2332 | |
| 2333 | if (pin) { |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2334 | ret = pin_down_bytes(trans, root, path, |
| 2335 | bytenr, num_bytes, |
| 2336 | owner_objectid >= BTRFS_FIRST_FREE_OBJECTID, |
| 2337 | &must_clean); |
Yan | c549228 | 2007-11-06 10:25:25 -0500 | [diff] [blame] | 2338 | if (ret > 0) |
| 2339 | mark_free = 1; |
| 2340 | BUG_ON(ret < 0); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 2341 | } |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2342 | |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 2343 | /* block accounting for super block */ |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 2344 | spin_lock(&info->delalloc_lock); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2345 | super_used = btrfs_super_bytes_used(&info->super_copy); |
| 2346 | btrfs_set_super_bytes_used(&info->super_copy, |
| 2347 | super_used - num_bytes); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 2348 | |
| 2349 | /* block accounting for root item */ |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2350 | root_used = btrfs_root_used(&root->root_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2351 | btrfs_set_root_used(&root->root_item, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2352 | root_used - num_bytes); |
Yan Zheng | 34bf63c | 2008-12-19 10:58:46 -0500 | [diff] [blame] | 2353 | spin_unlock(&info->delalloc_lock); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2354 | |
| 2355 | /* |
| 2356 | * it is going to be very rare for someone to be waiting |
| 2357 | * on the block we're freeing. del_items might need to |
| 2358 | * schedule, so rather than get fancy, just force it |
| 2359 | * to blocking here |
| 2360 | */ |
| 2361 | if (must_clean) |
| 2362 | btrfs_set_lock_blocking(must_clean); |
| 2363 | |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2364 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
| 2365 | num_to_del); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2366 | BUG_ON(ret); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2367 | btrfs_release_path(extent_root, path); |
David Woodhouse | 21af804 | 2008-08-12 14:13:26 +0100 | [diff] [blame] | 2368 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2369 | if (must_clean) { |
| 2370 | clean_tree_block(NULL, root, must_clean); |
| 2371 | btrfs_tree_unlock(must_clean); |
| 2372 | free_extent_buffer(must_clean); |
| 2373 | } |
| 2374 | |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 2375 | if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
| 2376 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
| 2377 | BUG_ON(ret); |
Chris Mason | d57e62b | 2009-03-31 13:47:50 -0400 | [diff] [blame] | 2378 | } else { |
| 2379 | invalidate_mapping_pages(info->btree_inode->i_mapping, |
| 2380 | bytenr >> PAGE_CACHE_SHIFT, |
| 2381 | (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT); |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 2382 | } |
| 2383 | |
Chris Mason | dcbdd4d | 2008-12-16 13:51:01 -0500 | [diff] [blame] | 2384 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
| 2385 | mark_free); |
| 2386 | BUG_ON(ret); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2387 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2388 | btrfs_free_path(path); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2389 | return ret; |
| 2390 | } |
| 2391 | |
| 2392 | /* |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2393 | * remove an extent from the root, returns 0 on success |
| 2394 | */ |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2395 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2396 | struct btrfs_root *root, |
| 2397 | u64 bytenr, u64 num_bytes, u64 parent, |
| 2398 | u64 root_objectid, u64 ref_generation, |
| 2399 | u64 owner_objectid, int pin, |
| 2400 | int refs_to_drop) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2401 | { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2402 | WARN_ON(num_bytes < root->sectorsize); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2403 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2404 | /* |
| 2405 | * if metadata always pin |
| 2406 | * if data pin when any transaction has committed this |
| 2407 | */ |
| 2408 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID || |
| 2409 | ref_generation != trans->transid) |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 2410 | pin = 1; |
| 2411 | |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 2412 | if (ref_generation != trans->transid) |
| 2413 | pin = 1; |
| 2414 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2415 | return __free_extent(trans, root, bytenr, num_bytes, parent, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2416 | root_objectid, ref_generation, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2417 | owner_objectid, pin, pin == 0, refs_to_drop); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2418 | } |
| 2419 | |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 2420 | /* |
| 2421 | * when we free an extent, it is possible (and likely) that we free the last |
| 2422 | * delayed ref for that extent as well. This searches the delayed ref tree for |
| 2423 | * a given extent, and if there are no other delayed refs to be processed, it |
| 2424 | * removes it from the tree. |
| 2425 | */ |
| 2426 | static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, |
| 2427 | struct btrfs_root *root, u64 bytenr) |
| 2428 | { |
| 2429 | struct btrfs_delayed_ref_head *head; |
| 2430 | struct btrfs_delayed_ref_root *delayed_refs; |
| 2431 | struct btrfs_delayed_ref_node *ref; |
| 2432 | struct rb_node *node; |
| 2433 | int ret; |
| 2434 | |
| 2435 | delayed_refs = &trans->transaction->delayed_refs; |
| 2436 | spin_lock(&delayed_refs->lock); |
| 2437 | head = btrfs_find_delayed_ref_head(trans, bytenr); |
| 2438 | if (!head) |
| 2439 | goto out; |
| 2440 | |
| 2441 | node = rb_prev(&head->node.rb_node); |
| 2442 | if (!node) |
| 2443 | goto out; |
| 2444 | |
| 2445 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); |
| 2446 | |
| 2447 | /* there are still entries for this ref, we can't drop it */ |
| 2448 | if (ref->bytenr == bytenr) |
| 2449 | goto out; |
| 2450 | |
| 2451 | /* |
| 2452 | * waiting for the lock here would deadlock. If someone else has it |
| 2453 | * locked they are already in the process of dropping it anyway |
| 2454 | */ |
| 2455 | if (!mutex_trylock(&head->mutex)) |
| 2456 | goto out; |
| 2457 | |
| 2458 | /* |
| 2459 | * at this point we have a head with no other entries. Go |
| 2460 | * ahead and process it. |
| 2461 | */ |
| 2462 | head->node.in_tree = 0; |
| 2463 | rb_erase(&head->node.rb_node, &delayed_refs->root); |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2464 | |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 2465 | delayed_refs->num_entries--; |
| 2466 | |
| 2467 | /* |
| 2468 | * we don't take a ref on the node because we're removing it from the |
| 2469 | * tree, so we just steal the ref the tree was holding. |
| 2470 | */ |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 2471 | delayed_refs->num_heads--; |
| 2472 | if (list_empty(&head->cluster)) |
| 2473 | delayed_refs->num_heads_ready--; |
| 2474 | |
| 2475 | list_del_init(&head->cluster); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 2476 | spin_unlock(&delayed_refs->lock); |
| 2477 | |
| 2478 | ret = run_one_delayed_ref(trans, root->fs_info->tree_root, |
| 2479 | &head->node, head->must_insert_reserved); |
| 2480 | BUG_ON(ret); |
| 2481 | btrfs_put_delayed_ref(&head->node); |
| 2482 | return 0; |
| 2483 | out: |
| 2484 | spin_unlock(&delayed_refs->lock); |
| 2485 | return 0; |
| 2486 | } |
| 2487 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2488 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2489 | struct btrfs_root *root, |
| 2490 | u64 bytenr, u64 num_bytes, u64 parent, |
| 2491 | u64 root_objectid, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2492 | u64 owner_objectid, int pin) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2493 | { |
| 2494 | int ret; |
| 2495 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2496 | /* |
| 2497 | * tree log blocks never actually go into the extent allocation |
| 2498 | * tree, just update pinning info and exit early. |
| 2499 | * |
| 2500 | * data extents referenced by the tree log do need to have |
| 2501 | * their reference counts bumped. |
| 2502 | */ |
| 2503 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID && |
| 2504 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2505 | /* unlocks the pinned mutex */ |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2506 | btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2507 | update_reserved_extents(root, bytenr, num_bytes, 0); |
| 2508 | ret = 0; |
| 2509 | } else { |
| 2510 | ret = btrfs_add_delayed_ref(trans, bytenr, num_bytes, parent, |
| 2511 | root_objectid, ref_generation, |
| 2512 | owner_objectid, |
| 2513 | BTRFS_DROP_DELAYED_REF, 1); |
Chris Mason | 1887be6 | 2009-03-13 10:11:24 -0400 | [diff] [blame] | 2514 | BUG_ON(ret); |
| 2515 | ret = check_ref_cleanup(trans, root, bytenr); |
| 2516 | BUG_ON(ret); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2517 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2518 | return ret; |
| 2519 | } |
| 2520 | |
Chris Mason | 87ee04e | 2007-11-30 11:30:34 -0500 | [diff] [blame] | 2521 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
| 2522 | { |
| 2523 | u64 mask = ((u64)root->stripesize - 1); |
| 2524 | u64 ret = (val + mask) & ~mask; |
| 2525 | return ret; |
| 2526 | } |
| 2527 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2528 | /* |
| 2529 | * walks the btree of allocated extents and find a hole of a given size. |
| 2530 | * The key ins is changed to record the hole: |
| 2531 | * ins->objectid == block start |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2532 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2533 | * ins->offset == number of blocks |
| 2534 | * Any available blocks before search_start are skipped. |
| 2535 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2536 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 2537 | struct btrfs_root *orig_root, |
| 2538 | u64 num_bytes, u64 empty_size, |
| 2539 | u64 search_start, u64 search_end, |
| 2540 | u64 hint_byte, struct btrfs_key *ins, |
| 2541 | u64 exclude_start, u64 exclude_nr, |
| 2542 | int data) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2543 | { |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2544 | int ret = 0; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2545 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2546 | u64 *last_ptr = NULL; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2547 | struct btrfs_block_group_cache *block_group = NULL; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2548 | int empty_cluster = 2 * 1024 * 1024; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2549 | int allowed_chunk_alloc = 0; |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2550 | int using_hint = 0; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2551 | struct btrfs_space_info *space_info; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2552 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2553 | WARN_ON(num_bytes < root->sectorsize); |
Chris Mason | b1a4d96 | 2007-04-04 15:27:52 -0400 | [diff] [blame] | 2554 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2555 | ins->objectid = 0; |
| 2556 | ins->offset = 0; |
Chris Mason | b1a4d96 | 2007-04-04 15:27:52 -0400 | [diff] [blame] | 2557 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2558 | space_info = __find_space_info(root->fs_info, data); |
| 2559 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2560 | if (orig_root->ref_cows || empty_size) |
| 2561 | allowed_chunk_alloc = 1; |
| 2562 | |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2563 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
| 2564 | last_ptr = &root->fs_info->last_alloc; |
Chris Mason | 536ac8a | 2009-02-12 09:41:38 -0500 | [diff] [blame] | 2565 | if (!btrfs_test_opt(root, SSD)) |
| 2566 | empty_cluster = 64 * 1024; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2567 | } |
| 2568 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2569 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2570 | last_ptr = &root->fs_info->last_data_alloc; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2571 | |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2572 | if (last_ptr) { |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2573 | if (*last_ptr) |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2574 | hint_byte = *last_ptr; |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2575 | else |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2576 | empty_size += empty_cluster; |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2577 | } else { |
| 2578 | empty_cluster = 0; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2579 | } |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2580 | search_start = max(search_start, first_logical_byte(root, 0)); |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2581 | search_start = max(search_start, hint_byte); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2582 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2583 | if (search_start == hint_byte) { |
| 2584 | using_hint = 1; |
| 2585 | block_group = btrfs_lookup_block_group(root->fs_info, |
| 2586 | search_start); |
| 2587 | if (block_group && block_group_bits(block_group, data)) { |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2588 | down_read(&space_info->groups_sem); |
| 2589 | goto have_block_group; |
| 2590 | } else if (block_group) { |
| 2591 | put_block_group(block_group); |
| 2592 | } |
| 2593 | |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 2594 | empty_size += empty_cluster; |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2595 | using_hint = 0; |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 2596 | } |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2597 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2598 | search: |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2599 | down_read(&space_info->groups_sem); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2600 | list_for_each_entry(block_group, &space_info->block_groups, list) { |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2601 | u64 offset; |
Chris Mason | 8a1413a | 2008-11-10 16:13:54 -0500 | [diff] [blame] | 2602 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2603 | atomic_inc(&block_group->count); |
| 2604 | search_start = block_group->key.objectid; |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 2605 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2606 | have_block_group: |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 2607 | if (unlikely(!block_group->cached)) { |
| 2608 | mutex_lock(&block_group->cache_mutex); |
| 2609 | ret = cache_block_group(root, block_group); |
| 2610 | mutex_unlock(&block_group->cache_mutex); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2611 | if (ret) { |
| 2612 | put_block_group(block_group); |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 2613 | break; |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2614 | } |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 2615 | } |
| 2616 | |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 2617 | if (unlikely(block_group->ro)) |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2618 | goto loop; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2619 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2620 | offset = btrfs_find_space_for_alloc(block_group, search_start, |
| 2621 | num_bytes, empty_size); |
| 2622 | if (!offset) |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2623 | goto loop; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2624 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2625 | search_start = stripe_align(root, offset); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2626 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2627 | /* move on to the next group */ |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2628 | if (search_start + num_bytes >= search_end) { |
| 2629 | btrfs_add_free_space(block_group, offset, num_bytes); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2630 | goto loop; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2631 | } |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 2632 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2633 | /* move on to the next group */ |
| 2634 | if (search_start + num_bytes > |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2635 | block_group->key.objectid + block_group->key.offset) { |
| 2636 | btrfs_add_free_space(block_group, offset, num_bytes); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2637 | goto loop; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2638 | } |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2639 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2640 | if (using_hint && search_start > hint_byte) { |
| 2641 | btrfs_add_free_space(block_group, offset, num_bytes); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2642 | goto loop; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2643 | } |
Chris Mason | 3b7885b | 2008-11-06 21:48:27 -0500 | [diff] [blame] | 2644 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2645 | if (exclude_nr > 0 && |
| 2646 | (search_start + num_bytes > exclude_start && |
| 2647 | search_start < exclude_start + exclude_nr)) { |
| 2648 | search_start = exclude_start + exclude_nr; |
| 2649 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2650 | btrfs_add_free_space(block_group, offset, num_bytes); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2651 | /* |
| 2652 | * if search_start is still in this block group |
| 2653 | * then we just re-search this block group |
| 2654 | */ |
| 2655 | if (search_start >= block_group->key.objectid && |
| 2656 | search_start < (block_group->key.objectid + |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2657 | block_group->key.offset)) |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2658 | goto have_block_group; |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2659 | goto loop; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2660 | } |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2661 | |
| 2662 | ins->objectid = search_start; |
| 2663 | ins->offset = num_bytes; |
| 2664 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2665 | if (offset < search_start) |
| 2666 | btrfs_add_free_space(block_group, offset, |
| 2667 | search_start - offset); |
| 2668 | BUG_ON(offset > search_start); |
| 2669 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2670 | /* we are all good, lets return */ |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2671 | break; |
| 2672 | loop: |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2673 | put_block_group(block_group); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2674 | if (using_hint) { |
| 2675 | empty_size += empty_cluster; |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2676 | using_hint = 0; |
| 2677 | up_read(&space_info->groups_sem); |
| 2678 | goto search; |
| 2679 | } |
| 2680 | } |
| 2681 | up_read(&space_info->groups_sem); |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 2682 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2683 | if (!ins->objectid && (empty_size || allowed_chunk_alloc)) { |
| 2684 | int try_again = empty_size; |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 2685 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2686 | empty_size = 0; |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 2687 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2688 | if (allowed_chunk_alloc) { |
| 2689 | ret = do_chunk_alloc(trans, root, num_bytes + |
| 2690 | 2 * 1024 * 1024, data, 1); |
| 2691 | if (!ret) |
| 2692 | try_again = 1; |
| 2693 | allowed_chunk_alloc = 0; |
| 2694 | } else { |
| 2695 | space_info->force_alloc = 1; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2696 | } |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2697 | |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2698 | if (try_again) |
| 2699 | goto search; |
| 2700 | ret = -ENOSPC; |
| 2701 | } else if (!ins->objectid) { |
| 2702 | ret = -ENOSPC; |
Chris Mason | e19caa5 | 2007-10-15 16:17:44 -0400 | [diff] [blame] | 2703 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2704 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2705 | /* we found what we needed */ |
| 2706 | if (ins->objectid) { |
| 2707 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2708 | trans->block_group = block_group->key.objectid; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2709 | |
| 2710 | if (last_ptr) |
| 2711 | *last_ptr = ins->objectid + ins->offset; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2712 | put_block_group(block_group); |
Josef Bacik | 2552d17 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 2713 | ret = 0; |
| 2714 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2715 | |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 2716 | return ret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2717 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 2718 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2719 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes) |
| 2720 | { |
| 2721 | struct btrfs_block_group_cache *cache; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2722 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2723 | printk(KERN_INFO "space_info has %llu free, is %sfull\n", |
| 2724 | (unsigned long long)(info->total_bytes - info->bytes_used - |
| 2725 | info->bytes_pinned - info->bytes_reserved), |
| 2726 | (info->full) ? "" : "not "); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 2727 | printk(KERN_INFO "space_info total=%llu, pinned=%llu, delalloc=%llu," |
| 2728 | " may_use=%llu, used=%llu\n", info->total_bytes, |
| 2729 | info->bytes_pinned, info->bytes_delalloc, info->bytes_may_use, |
| 2730 | info->bytes_used); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2731 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2732 | down_read(&info->groups_sem); |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 2733 | list_for_each_entry(cache, &info->block_groups, list) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2734 | spin_lock(&cache->lock); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2735 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used " |
| 2736 | "%llu pinned %llu reserved\n", |
| 2737 | (unsigned long long)cache->key.objectid, |
| 2738 | (unsigned long long)cache->key.offset, |
| 2739 | (unsigned long long)btrfs_block_group_used(&cache->item), |
| 2740 | (unsigned long long)cache->pinned, |
| 2741 | (unsigned long long)cache->reserved); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2742 | btrfs_dump_free_space(cache, bytes); |
| 2743 | spin_unlock(&cache->lock); |
| 2744 | } |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2745 | up_read(&info->groups_sem); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2746 | } |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2747 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2748 | static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
| 2749 | struct btrfs_root *root, |
| 2750 | u64 num_bytes, u64 min_alloc_size, |
| 2751 | u64 empty_size, u64 hint_byte, |
| 2752 | u64 search_end, struct btrfs_key *ins, |
| 2753 | u64 data) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2754 | { |
| 2755 | int ret; |
Chris Mason | fbdc762 | 2007-05-30 10:22:12 -0400 | [diff] [blame] | 2756 | u64 search_start = 0; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 2757 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2758 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 2759 | data = btrfs_get_alloc_profile(root, data); |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 2760 | again: |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2761 | /* |
| 2762 | * the only place that sets empty_size is btrfs_realloc_node, which |
| 2763 | * is not called recursively on allocations |
| 2764 | */ |
| 2765 | if (empty_size || root->ref_cows) { |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 2766 | if (!(data & BTRFS_BLOCK_GROUP_METADATA)) { |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2767 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2768 | 2 * 1024 * 1024, |
| 2769 | BTRFS_BLOCK_GROUP_METADATA | |
| 2770 | (info->metadata_alloc_profile & |
| 2771 | info->avail_metadata_alloc_bits), 0); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2772 | } |
| 2773 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2774 | num_bytes + 2 * 1024 * 1024, data, 0); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2775 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2776 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2777 | WARN_ON(num_bytes < root->sectorsize); |
| 2778 | ret = find_free_extent(trans, root, num_bytes, empty_size, |
| 2779 | search_start, search_end, hint_byte, ins, |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 2780 | trans->alloc_exclude_start, |
| 2781 | trans->alloc_exclude_nr, data); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 2782 | |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 2783 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
| 2784 | num_bytes = num_bytes >> 1; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2785 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 2786 | num_bytes = max(num_bytes, min_alloc_size); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2787 | do_chunk_alloc(trans, root->fs_info->extent_root, |
| 2788 | num_bytes, data, 1); |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 2789 | goto again; |
| 2790 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 2791 | if (ret) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2792 | struct btrfs_space_info *sinfo; |
| 2793 | |
| 2794 | sinfo = __find_space_info(root->fs_info, data); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2795 | printk(KERN_ERR "btrfs allocation failed flags %llu, " |
| 2796 | "wanted %llu\n", (unsigned long long)data, |
| 2797 | (unsigned long long)num_bytes); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2798 | dump_space_info(sinfo, num_bytes); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2799 | BUG(); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2800 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2801 | |
| 2802 | return ret; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2803 | } |
| 2804 | |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 2805 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
| 2806 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2807 | struct btrfs_block_group_cache *cache; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 2808 | int ret = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2809 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2810 | cache = btrfs_lookup_block_group(root->fs_info, start); |
| 2811 | if (!cache) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2812 | printk(KERN_ERR "Unable to find block group for %llu\n", |
| 2813 | (unsigned long long)start); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2814 | return -ENOSPC; |
| 2815 | } |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 2816 | |
| 2817 | ret = btrfs_discard_extent(root, start, len); |
| 2818 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2819 | btrfs_add_free_space(cache, start, len); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2820 | put_block_group(cache); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 2821 | update_reserved_extents(root, start, len, 0); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 2822 | |
| 2823 | return ret; |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 2824 | } |
| 2825 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2826 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
| 2827 | struct btrfs_root *root, |
| 2828 | u64 num_bytes, u64 min_alloc_size, |
| 2829 | u64 empty_size, u64 hint_byte, |
| 2830 | u64 search_end, struct btrfs_key *ins, |
| 2831 | u64 data) |
| 2832 | { |
| 2833 | int ret; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2834 | ret = __btrfs_reserve_extent(trans, root, num_bytes, min_alloc_size, |
| 2835 | empty_size, hint_byte, search_end, ins, |
| 2836 | data); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2837 | update_reserved_extents(root, ins->objectid, ins->offset, 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2838 | return ret; |
| 2839 | } |
| 2840 | |
| 2841 | static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2842 | struct btrfs_root *root, u64 parent, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2843 | u64 root_objectid, u64 ref_generation, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2844 | u64 owner, struct btrfs_key *ins, |
| 2845 | int ref_mod) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2846 | { |
| 2847 | int ret; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2848 | u64 super_used; |
| 2849 | u64 root_used; |
| 2850 | u64 num_bytes = ins->offset; |
| 2851 | u32 sizes[2]; |
| 2852 | struct btrfs_fs_info *info = root->fs_info; |
| 2853 | struct btrfs_root *extent_root = info->extent_root; |
| 2854 | struct btrfs_extent_item *extent_item; |
| 2855 | struct btrfs_extent_ref *ref; |
| 2856 | struct btrfs_path *path; |
| 2857 | struct btrfs_key keys[2]; |
Chris Mason | f2654de | 2007-06-26 12:20:46 -0400 | [diff] [blame] | 2858 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2859 | if (parent == 0) |
| 2860 | parent = ins->objectid; |
| 2861 | |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 2862 | /* block accounting for super block */ |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 2863 | spin_lock(&info->delalloc_lock); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2864 | super_used = btrfs_super_bytes_used(&info->super_copy); |
| 2865 | btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes); |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 2866 | |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 2867 | /* block accounting for root item */ |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2868 | root_used = btrfs_root_used(&root->root_item); |
| 2869 | btrfs_set_root_used(&root->root_item, root_used + num_bytes); |
Yan Zheng | 34bf63c | 2008-12-19 10:58:46 -0500 | [diff] [blame] | 2870 | spin_unlock(&info->delalloc_lock); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 2871 | |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 2872 | memcpy(&keys[0], ins, sizeof(*ins)); |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 2873 | keys[1].objectid = ins->objectid; |
| 2874 | keys[1].type = BTRFS_EXTENT_REF_KEY; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2875 | keys[1].offset = parent; |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 2876 | sizes[0] = sizeof(*extent_item); |
| 2877 | sizes[1] = sizeof(*ref); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2878 | |
| 2879 | path = btrfs_alloc_path(); |
| 2880 | BUG_ON(!path); |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 2881 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2882 | path->leave_spinning = 1; |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 2883 | ret = btrfs_insert_empty_items(trans, extent_root, path, keys, |
| 2884 | sizes, 2); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2885 | BUG_ON(ret); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2886 | |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 2887 | extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 2888 | struct btrfs_extent_item); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2889 | btrfs_set_extent_refs(path->nodes[0], extent_item, ref_mod); |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 2890 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, |
| 2891 | struct btrfs_extent_ref); |
| 2892 | |
| 2893 | btrfs_set_ref_root(path->nodes[0], ref, root_objectid); |
| 2894 | btrfs_set_ref_generation(path->nodes[0], ref, ref_generation); |
| 2895 | btrfs_set_ref_objectid(path->nodes[0], ref, owner); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2896 | btrfs_set_ref_num_refs(path->nodes[0], ref, ref_mod); |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 2897 | |
| 2898 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 2899 | |
| 2900 | trans->alloc_exclude_start = 0; |
| 2901 | trans->alloc_exclude_nr = 0; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2902 | btrfs_free_path(path); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 2903 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2904 | if (ret) |
| 2905 | goto out; |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 2906 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2907 | ret = update_block_group(trans, root, ins->objectid, |
| 2908 | ins->offset, 1, 0); |
Chris Mason | f594706 | 2008-02-04 10:10:13 -0500 | [diff] [blame] | 2909 | if (ret) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2910 | printk(KERN_ERR "btrfs update block group failed for %llu " |
| 2911 | "%llu\n", (unsigned long long)ins->objectid, |
| 2912 | (unsigned long long)ins->offset); |
Chris Mason | f594706 | 2008-02-04 10:10:13 -0500 | [diff] [blame] | 2913 | BUG(); |
| 2914 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2915 | out: |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2916 | return ret; |
| 2917 | } |
| 2918 | |
| 2919 | int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2920 | struct btrfs_root *root, u64 parent, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2921 | u64 root_objectid, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2922 | u64 owner, struct btrfs_key *ins) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2923 | { |
| 2924 | int ret; |
Chris Mason | 1c2308f | 2008-09-23 13:14:13 -0400 | [diff] [blame] | 2925 | |
| 2926 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) |
| 2927 | return 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2928 | |
| 2929 | ret = btrfs_add_delayed_ref(trans, ins->objectid, |
| 2930 | ins->offset, parent, root_objectid, |
| 2931 | ref_generation, owner, |
| 2932 | BTRFS_ADD_DELAYED_EXTENT, 0); |
| 2933 | BUG_ON(ret); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2934 | return ret; |
| 2935 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2936 | |
| 2937 | /* |
| 2938 | * this is used by the tree logging recovery code. It records that |
| 2939 | * an extent has been allocated and makes sure to clear the free |
| 2940 | * space cache bits as well |
| 2941 | */ |
| 2942 | int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2943 | struct btrfs_root *root, u64 parent, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2944 | u64 root_objectid, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2945 | u64 owner, struct btrfs_key *ins) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2946 | { |
| 2947 | int ret; |
| 2948 | struct btrfs_block_group_cache *block_group; |
| 2949 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2950 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 2951 | mutex_lock(&block_group->cache_mutex); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2952 | cache_block_group(root, block_group); |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 2953 | mutex_unlock(&block_group->cache_mutex); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2954 | |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 2955 | ret = btrfs_remove_free_space(block_group, ins->objectid, |
| 2956 | ins->offset); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2957 | BUG_ON(ret); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2958 | put_block_group(block_group); |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2959 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid, |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2960 | ref_generation, owner, ins, 1); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2961 | return ret; |
| 2962 | } |
| 2963 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2964 | /* |
| 2965 | * finds a free extent and does all the dirty work required for allocation |
| 2966 | * returns the key for the extent through ins, and a tree buffer for |
| 2967 | * the first block of the extent through buf. |
| 2968 | * |
| 2969 | * returns 0 if everything worked, non-zero otherwise. |
| 2970 | */ |
| 2971 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, |
| 2972 | struct btrfs_root *root, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2973 | u64 num_bytes, u64 parent, u64 min_alloc_size, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2974 | u64 root_objectid, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2975 | u64 owner_objectid, u64 empty_size, u64 hint_byte, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2976 | u64 search_end, struct btrfs_key *ins, u64 data) |
| 2977 | { |
| 2978 | int ret; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2979 | ret = __btrfs_reserve_extent(trans, root, num_bytes, |
| 2980 | min_alloc_size, empty_size, hint_byte, |
| 2981 | search_end, ins, data); |
| 2982 | BUG_ON(ret); |
Chris Mason | d00aff0 | 2008-09-11 15:54:42 -0400 | [diff] [blame] | 2983 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2984 | ret = btrfs_add_delayed_ref(trans, ins->objectid, |
| 2985 | ins->offset, parent, root_objectid, |
| 2986 | ref_generation, owner_objectid, |
| 2987 | BTRFS_ADD_DELAYED_EXTENT, 0); |
Chris Mason | d00aff0 | 2008-09-11 15:54:42 -0400 | [diff] [blame] | 2988 | BUG_ON(ret); |
Chris Mason | d00aff0 | 2008-09-11 15:54:42 -0400 | [diff] [blame] | 2989 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2990 | update_reserved_extents(root, ins->objectid, ins->offset, 1); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2991 | return ret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2992 | } |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 2993 | |
| 2994 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, |
| 2995 | struct btrfs_root *root, |
Chris Mason | 4008c04 | 2009-02-12 14:09:45 -0500 | [diff] [blame] | 2996 | u64 bytenr, u32 blocksize, |
| 2997 | int level) |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 2998 | { |
| 2999 | struct extent_buffer *buf; |
| 3000 | |
| 3001 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
| 3002 | if (!buf) |
| 3003 | return ERR_PTR(-ENOMEM); |
| 3004 | btrfs_set_header_generation(buf, trans->transid); |
Chris Mason | 4008c04 | 2009-02-12 14:09:45 -0500 | [diff] [blame] | 3005 | btrfs_set_buffer_lockdep_class(buf, level); |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3006 | btrfs_tree_lock(buf); |
| 3007 | clean_tree_block(trans, root, buf); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 3008 | |
| 3009 | btrfs_set_lock_blocking(buf); |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3010 | btrfs_set_buffer_uptodate(buf); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 3011 | |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3012 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
| 3013 | set_extent_dirty(&root->dirty_log_pages, buf->start, |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3014 | buf->start + buf->len - 1, GFP_NOFS); |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3015 | } else { |
| 3016 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
| 3017 | buf->start + buf->len - 1, GFP_NOFS); |
| 3018 | } |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3019 | trans->blocks_used++; |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 3020 | /* this returns a buffer locked for blocking */ |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3021 | return buf; |
| 3022 | } |
| 3023 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3024 | /* |
| 3025 | * helper function to allocate a block for a given tree |
| 3026 | * returns the tree buffer or NULL. |
| 3027 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3028 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3029 | struct btrfs_root *root, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3030 | u32 blocksize, u64 parent, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3031 | u64 root_objectid, |
| 3032 | u64 ref_generation, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3033 | int level, |
| 3034 | u64 hint, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3035 | u64 empty_size) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3036 | { |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 3037 | struct btrfs_key ins; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3038 | int ret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3039 | struct extent_buffer *buf; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3040 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3041 | ret = btrfs_alloc_extent(trans, root, blocksize, parent, blocksize, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3042 | root_objectid, ref_generation, level, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3043 | empty_size, hint, (u64)-1, &ins, 0); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3044 | if (ret) { |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3045 | BUG_ON(ret > 0); |
| 3046 | return ERR_PTR(ret); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3047 | } |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 3048 | |
Chris Mason | 4008c04 | 2009-02-12 14:09:45 -0500 | [diff] [blame] | 3049 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, |
| 3050 | blocksize, level); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3051 | return buf; |
| 3052 | } |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 3053 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3054 | int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, |
| 3055 | struct btrfs_root *root, struct extent_buffer *leaf) |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3056 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3057 | u64 leaf_owner; |
| 3058 | u64 leaf_generation; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3059 | struct refsort *sorted; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3060 | struct btrfs_key key; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3061 | struct btrfs_file_extent_item *fi; |
| 3062 | int i; |
| 3063 | int nritems; |
| 3064 | int ret; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3065 | int refi = 0; |
| 3066 | int slot; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3067 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3068 | BUG_ON(!btrfs_is_leaf(leaf)); |
| 3069 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3070 | leaf_owner = btrfs_header_owner(leaf); |
| 3071 | leaf_generation = btrfs_header_generation(leaf); |
| 3072 | |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3073 | sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS); |
| 3074 | /* we do this loop twice. The first time we build a list |
| 3075 | * of the extents we have a reference on, then we sort the list |
| 3076 | * by bytenr. The second time around we actually do the |
| 3077 | * extent freeing. |
| 3078 | */ |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3079 | for (i = 0; i < nritems; i++) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3080 | u64 disk_bytenr; |
Chris Mason | e34a5b4 | 2008-07-22 12:08:37 -0400 | [diff] [blame] | 3081 | cond_resched(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3082 | |
| 3083 | btrfs_item_key_to_cpu(leaf, &key, i); |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3084 | |
| 3085 | /* only extents have references, skip everything else */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3086 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3087 | continue; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3088 | |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3089 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3090 | |
| 3091 | /* inline extents live in the btree, they don't have refs */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3092 | if (btrfs_file_extent_type(leaf, fi) == |
| 3093 | BTRFS_FILE_EXTENT_INLINE) |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 3094 | continue; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3095 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3096 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3097 | |
| 3098 | /* holes don't have refs */ |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3099 | if (disk_bytenr == 0) |
Chris Mason | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 3100 | continue; |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 3101 | |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3102 | sorted[refi].bytenr = disk_bytenr; |
| 3103 | sorted[refi].slot = i; |
| 3104 | refi++; |
| 3105 | } |
| 3106 | |
| 3107 | if (refi == 0) |
| 3108 | goto out; |
| 3109 | |
| 3110 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); |
| 3111 | |
| 3112 | for (i = 0; i < refi; i++) { |
| 3113 | u64 disk_bytenr; |
| 3114 | |
| 3115 | disk_bytenr = sorted[i].bytenr; |
| 3116 | slot = sorted[i].slot; |
| 3117 | |
| 3118 | cond_resched(); |
| 3119 | |
| 3120 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 3121 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
| 3122 | continue; |
| 3123 | |
| 3124 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); |
| 3125 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 3126 | ret = btrfs_free_extent(trans, root, disk_bytenr, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3127 | btrfs_file_extent_disk_num_bytes(leaf, fi), |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3128 | leaf->start, leaf_owner, leaf_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3129 | key.objectid, 0); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3130 | BUG_ON(ret); |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 3131 | |
| 3132 | atomic_inc(&root->fs_info->throttle_gen); |
| 3133 | wake_up(&root->fs_info->transaction_throttle); |
| 3134 | cond_resched(); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3135 | } |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3136 | out: |
| 3137 | kfree(sorted); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3138 | return 0; |
| 3139 | } |
| 3140 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3141 | static noinline int cache_drop_leaf_ref(struct btrfs_trans_handle *trans, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3142 | struct btrfs_root *root, |
| 3143 | struct btrfs_leaf_ref *ref) |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3144 | { |
| 3145 | int i; |
| 3146 | int ret; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3147 | struct btrfs_extent_info *info; |
| 3148 | struct refsort *sorted; |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3149 | |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3150 | if (ref->nritems == 0) |
| 3151 | return 0; |
| 3152 | |
| 3153 | sorted = kmalloc(sizeof(*sorted) * ref->nritems, GFP_NOFS); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3154 | for (i = 0; i < ref->nritems; i++) { |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3155 | sorted[i].bytenr = ref->extents[i].bytenr; |
| 3156 | sorted[i].slot = i; |
| 3157 | } |
| 3158 | sort(sorted, ref->nritems, sizeof(struct refsort), refsort_cmp, NULL); |
| 3159 | |
| 3160 | /* |
| 3161 | * the items in the ref were sorted when the ref was inserted |
| 3162 | * into the ref cache, so this is already in order |
| 3163 | */ |
| 3164 | for (i = 0; i < ref->nritems; i++) { |
| 3165 | info = ref->extents + sorted[i].slot; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 3166 | ret = btrfs_free_extent(trans, root, info->bytenr, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3167 | info->num_bytes, ref->bytenr, |
| 3168 | ref->owner, ref->generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3169 | info->objectid, 0); |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 3170 | |
| 3171 | atomic_inc(&root->fs_info->throttle_gen); |
| 3172 | wake_up(&root->fs_info->transaction_throttle); |
| 3173 | cond_resched(); |
| 3174 | |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3175 | BUG_ON(ret); |
| 3176 | info++; |
| 3177 | } |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3178 | |
Chris Mason | 806638b | 2009-02-05 09:08:14 -0500 | [diff] [blame] | 3179 | kfree(sorted); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3180 | return 0; |
| 3181 | } |
| 3182 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 3183 | static int drop_snap_lookup_refcount(struct btrfs_trans_handle *trans, |
| 3184 | struct btrfs_root *root, u64 start, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3185 | u64 len, u32 *refs) |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3186 | { |
Chris Mason | 017e536 | 2008-07-28 15:32:51 -0400 | [diff] [blame] | 3187 | int ret; |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 3188 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 3189 | ret = btrfs_lookup_extent_ref(trans, root, start, len, refs); |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 3190 | BUG_ON(ret); |
| 3191 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3192 | #if 0 /* some debugging code in case we see problems here */ |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 3193 | /* if the refs count is one, it won't get increased again. But |
| 3194 | * if the ref count is > 1, someone may be decreasing it at |
| 3195 | * the same time we are. |
| 3196 | */ |
| 3197 | if (*refs != 1) { |
| 3198 | struct extent_buffer *eb = NULL; |
| 3199 | eb = btrfs_find_create_tree_block(root, start, len); |
| 3200 | if (eb) |
| 3201 | btrfs_tree_lock(eb); |
| 3202 | |
| 3203 | mutex_lock(&root->fs_info->alloc_mutex); |
| 3204 | ret = lookup_extent_ref(NULL, root, start, len, refs); |
| 3205 | BUG_ON(ret); |
| 3206 | mutex_unlock(&root->fs_info->alloc_mutex); |
| 3207 | |
| 3208 | if (eb) { |
| 3209 | btrfs_tree_unlock(eb); |
| 3210 | free_extent_buffer(eb); |
| 3211 | } |
| 3212 | if (*refs == 1) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3213 | printk(KERN_ERR "btrfs block %llu went down to one " |
| 3214 | "during drop_snap\n", (unsigned long long)start); |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 3215 | } |
| 3216 | |
| 3217 | } |
| 3218 | #endif |
| 3219 | |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 3220 | cond_resched(); |
Chris Mason | 017e536 | 2008-07-28 15:32:51 -0400 | [diff] [blame] | 3221 | return ret; |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3222 | } |
| 3223 | |
| 3224 | /* |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3225 | * this is used while deleting old snapshots, and it drops the refs |
| 3226 | * on a whole subtree starting from a level 1 node. |
| 3227 | * |
| 3228 | * The idea is to sort all the leaf pointers, and then drop the |
| 3229 | * ref on all the leaves in order. Most of the time the leaves |
| 3230 | * will have ref cache entries, so no leaf IOs will be required to |
| 3231 | * find the extents they have references on. |
| 3232 | * |
| 3233 | * For each leaf, any references it has are also dropped in order |
| 3234 | * |
| 3235 | * This ends up dropping the references in something close to optimal |
| 3236 | * order for reading and modifying the extent allocation tree. |
| 3237 | */ |
| 3238 | static noinline int drop_level_one_refs(struct btrfs_trans_handle *trans, |
| 3239 | struct btrfs_root *root, |
| 3240 | struct btrfs_path *path) |
| 3241 | { |
| 3242 | u64 bytenr; |
| 3243 | u64 root_owner; |
| 3244 | u64 root_gen; |
| 3245 | struct extent_buffer *eb = path->nodes[1]; |
| 3246 | struct extent_buffer *leaf; |
| 3247 | struct btrfs_leaf_ref *ref; |
| 3248 | struct refsort *sorted = NULL; |
| 3249 | int nritems = btrfs_header_nritems(eb); |
| 3250 | int ret; |
| 3251 | int i; |
| 3252 | int refi = 0; |
| 3253 | int slot = path->slots[1]; |
| 3254 | u32 blocksize = btrfs_level_size(root, 0); |
| 3255 | u32 refs; |
| 3256 | |
| 3257 | if (nritems == 0) |
| 3258 | goto out; |
| 3259 | |
| 3260 | root_owner = btrfs_header_owner(eb); |
| 3261 | root_gen = btrfs_header_generation(eb); |
| 3262 | sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS); |
| 3263 | |
| 3264 | /* |
| 3265 | * step one, sort all the leaf pointers so we don't scribble |
| 3266 | * randomly into the extent allocation tree |
| 3267 | */ |
| 3268 | for (i = slot; i < nritems; i++) { |
| 3269 | sorted[refi].bytenr = btrfs_node_blockptr(eb, i); |
| 3270 | sorted[refi].slot = i; |
| 3271 | refi++; |
| 3272 | } |
| 3273 | |
| 3274 | /* |
| 3275 | * nritems won't be zero, but if we're picking up drop_snapshot |
| 3276 | * after a crash, slot might be > 0, so double check things |
| 3277 | * just in case. |
| 3278 | */ |
| 3279 | if (refi == 0) |
| 3280 | goto out; |
| 3281 | |
| 3282 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); |
| 3283 | |
| 3284 | /* |
| 3285 | * the first loop frees everything the leaves point to |
| 3286 | */ |
| 3287 | for (i = 0; i < refi; i++) { |
| 3288 | u64 ptr_gen; |
| 3289 | |
| 3290 | bytenr = sorted[i].bytenr; |
| 3291 | |
| 3292 | /* |
| 3293 | * check the reference count on this leaf. If it is > 1 |
| 3294 | * we just decrement it below and don't update any |
| 3295 | * of the refs the leaf points to. |
| 3296 | */ |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 3297 | ret = drop_snap_lookup_refcount(trans, root, bytenr, |
| 3298 | blocksize, &refs); |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3299 | BUG_ON(ret); |
| 3300 | if (refs != 1) |
| 3301 | continue; |
| 3302 | |
| 3303 | ptr_gen = btrfs_node_ptr_generation(eb, sorted[i].slot); |
| 3304 | |
| 3305 | /* |
| 3306 | * the leaf only had one reference, which means the |
| 3307 | * only thing pointing to this leaf is the snapshot |
| 3308 | * we're deleting. It isn't possible for the reference |
| 3309 | * count to increase again later |
| 3310 | * |
| 3311 | * The reference cache is checked for the leaf, |
| 3312 | * and if found we'll be able to drop any refs held by |
| 3313 | * the leaf without needing to read it in. |
| 3314 | */ |
| 3315 | ref = btrfs_lookup_leaf_ref(root, bytenr); |
| 3316 | if (ref && ref->generation != ptr_gen) { |
| 3317 | btrfs_free_leaf_ref(root, ref); |
| 3318 | ref = NULL; |
| 3319 | } |
| 3320 | if (ref) { |
| 3321 | ret = cache_drop_leaf_ref(trans, root, ref); |
| 3322 | BUG_ON(ret); |
| 3323 | btrfs_remove_leaf_ref(root, ref); |
| 3324 | btrfs_free_leaf_ref(root, ref); |
| 3325 | } else { |
| 3326 | /* |
| 3327 | * the leaf wasn't in the reference cache, so |
| 3328 | * we have to read it. |
| 3329 | */ |
| 3330 | leaf = read_tree_block(root, bytenr, blocksize, |
| 3331 | ptr_gen); |
| 3332 | ret = btrfs_drop_leaf_ref(trans, root, leaf); |
| 3333 | BUG_ON(ret); |
| 3334 | free_extent_buffer(leaf); |
| 3335 | } |
| 3336 | atomic_inc(&root->fs_info->throttle_gen); |
| 3337 | wake_up(&root->fs_info->transaction_throttle); |
| 3338 | cond_resched(); |
| 3339 | } |
| 3340 | |
| 3341 | /* |
| 3342 | * run through the loop again to free the refs on the leaves. |
| 3343 | * This is faster than doing it in the loop above because |
| 3344 | * the leaves are likely to be clustered together. We end up |
| 3345 | * working in nice chunks on the extent allocation tree. |
| 3346 | */ |
| 3347 | for (i = 0; i < refi; i++) { |
| 3348 | bytenr = sorted[i].bytenr; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 3349 | ret = btrfs_free_extent(trans, root, bytenr, |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3350 | blocksize, eb->start, |
| 3351 | root_owner, root_gen, 0, 1); |
| 3352 | BUG_ON(ret); |
| 3353 | |
| 3354 | atomic_inc(&root->fs_info->throttle_gen); |
| 3355 | wake_up(&root->fs_info->transaction_throttle); |
| 3356 | cond_resched(); |
| 3357 | } |
| 3358 | out: |
| 3359 | kfree(sorted); |
| 3360 | |
| 3361 | /* |
| 3362 | * update the path to show we've processed the entire level 1 |
| 3363 | * node. This will get saved into the root's drop_snapshot_progress |
| 3364 | * field so these drops are not repeated again if this transaction |
| 3365 | * commits. |
| 3366 | */ |
| 3367 | path->slots[1] = nritems; |
| 3368 | return 0; |
| 3369 | } |
| 3370 | |
| 3371 | /* |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3372 | * helper function for drop_snapshot, this walks down the tree dropping ref |
| 3373 | * counts as it goes. |
| 3374 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3375 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 3376 | struct btrfs_root *root, |
| 3377 | struct btrfs_path *path, int *level) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3378 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3379 | u64 root_owner; |
| 3380 | u64 root_gen; |
| 3381 | u64 bytenr; |
Chris Mason | ca7a79a | 2008-05-12 12:59:19 -0400 | [diff] [blame] | 3382 | u64 ptr_gen; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3383 | struct extent_buffer *next; |
| 3384 | struct extent_buffer *cur; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3385 | struct extent_buffer *parent; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3386 | u32 blocksize; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3387 | int ret; |
| 3388 | u32 refs; |
| 3389 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3390 | WARN_ON(*level < 0); |
| 3391 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 3392 | ret = drop_snap_lookup_refcount(trans, root, path->nodes[*level]->start, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3393 | path->nodes[*level]->len, &refs); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3394 | BUG_ON(ret); |
| 3395 | if (refs > 1) |
| 3396 | goto out; |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 3397 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3398 | /* |
| 3399 | * walk down to the last node level and free all the leaves |
| 3400 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3401 | while (*level >= 0) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3402 | WARN_ON(*level < 0); |
| 3403 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3404 | cur = path->nodes[*level]; |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 3405 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3406 | if (btrfs_header_level(cur) != *level) |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 3407 | WARN_ON(1); |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 3408 | |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 3409 | if (path->slots[*level] >= |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3410 | btrfs_header_nritems(cur)) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3411 | break; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3412 | |
| 3413 | /* the new code goes down to level 1 and does all the |
| 3414 | * leaves pointed to that node in bulk. So, this check |
| 3415 | * for level 0 will always be false. |
| 3416 | * |
| 3417 | * But, the disk format allows the drop_snapshot_progress |
| 3418 | * field in the root to leave things in a state where |
| 3419 | * a leaf will need cleaning up here. If someone crashes |
| 3420 | * with the old code and then boots with the new code, |
| 3421 | * we might find a leaf here. |
| 3422 | */ |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3423 | if (*level == 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3424 | ret = btrfs_drop_leaf_ref(trans, root, cur); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3425 | BUG_ON(ret); |
| 3426 | break; |
| 3427 | } |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3428 | |
| 3429 | /* |
| 3430 | * once we get to level one, process the whole node |
| 3431 | * at once, including everything below it. |
| 3432 | */ |
| 3433 | if (*level == 1) { |
| 3434 | ret = drop_level_one_refs(trans, root, path); |
| 3435 | BUG_ON(ret); |
| 3436 | break; |
| 3437 | } |
| 3438 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3439 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
Chris Mason | ca7a79a | 2008-05-12 12:59:19 -0400 | [diff] [blame] | 3440 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3441 | blocksize = btrfs_level_size(root, *level - 1); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3442 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 3443 | ret = drop_snap_lookup_refcount(trans, root, bytenr, |
| 3444 | blocksize, &refs); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3445 | BUG_ON(ret); |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3446 | |
| 3447 | /* |
| 3448 | * if there is more than one reference, we don't need |
| 3449 | * to read that node to drop any references it has. We |
| 3450 | * just drop the ref we hold on that node and move on to the |
| 3451 | * next slot in this level. |
| 3452 | */ |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3453 | if (refs != 1) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3454 | parent = path->nodes[*level]; |
| 3455 | root_owner = btrfs_header_owner(parent); |
| 3456 | root_gen = btrfs_header_generation(parent); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3457 | path->slots[*level]++; |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 3458 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 3459 | ret = btrfs_free_extent(trans, root, bytenr, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3460 | blocksize, parent->start, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3461 | root_owner, root_gen, |
| 3462 | *level - 1, 1); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3463 | BUG_ON(ret); |
Chris Mason | 18e35e0a | 2008-08-01 13:11:41 -0400 | [diff] [blame] | 3464 | |
| 3465 | atomic_inc(&root->fs_info->throttle_gen); |
| 3466 | wake_up(&root->fs_info->transaction_throttle); |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 3467 | cond_resched(); |
Chris Mason | 18e35e0a | 2008-08-01 13:11:41 -0400 | [diff] [blame] | 3468 | |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3469 | continue; |
| 3470 | } |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3471 | |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3472 | /* |
| 3473 | * we need to keep freeing things in the next level down. |
| 3474 | * read the block and loop around to process it |
| 3475 | */ |
| 3476 | next = read_tree_block(root, bytenr, blocksize, ptr_gen); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3477 | WARN_ON(*level <= 0); |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 3478 | if (path->nodes[*level-1]) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3479 | free_extent_buffer(path->nodes[*level-1]); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3480 | path->nodes[*level-1] = next; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3481 | *level = btrfs_header_level(next); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3482 | path->slots[*level] = 0; |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 3483 | cond_resched(); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3484 | } |
| 3485 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3486 | WARN_ON(*level < 0); |
| 3487 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3488 | |
| 3489 | if (path->nodes[*level] == root->node) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3490 | parent = path->nodes[*level]; |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3491 | bytenr = path->nodes[*level]->start; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3492 | } else { |
| 3493 | parent = path->nodes[*level + 1]; |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3494 | bytenr = btrfs_node_blockptr(parent, path->slots[*level + 1]); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3495 | } |
| 3496 | |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3497 | blocksize = btrfs_level_size(root, *level); |
| 3498 | root_owner = btrfs_header_owner(parent); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3499 | root_gen = btrfs_header_generation(parent); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3500 | |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3501 | /* |
| 3502 | * cleanup and free the reference on the last node |
| 3503 | * we processed |
| 3504 | */ |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 3505 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3506 | parent->start, root_owner, root_gen, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3507 | *level, 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3508 | free_extent_buffer(path->nodes[*level]); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3509 | path->nodes[*level] = NULL; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3510 | |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3511 | *level += 1; |
| 3512 | BUG_ON(ret); |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 3513 | |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 3514 | cond_resched(); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3515 | return 0; |
| 3516 | } |
| 3517 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3518 | /* |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3519 | * helper function for drop_subtree, this function is similar to |
| 3520 | * walk_down_tree. The main difference is that it checks reference |
| 3521 | * counts while tree blocks are locked. |
| 3522 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3523 | static noinline int walk_down_subtree(struct btrfs_trans_handle *trans, |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3524 | struct btrfs_root *root, |
| 3525 | struct btrfs_path *path, int *level) |
| 3526 | { |
| 3527 | struct extent_buffer *next; |
| 3528 | struct extent_buffer *cur; |
| 3529 | struct extent_buffer *parent; |
| 3530 | u64 bytenr; |
| 3531 | u64 ptr_gen; |
| 3532 | u32 blocksize; |
| 3533 | u32 refs; |
| 3534 | int ret; |
| 3535 | |
| 3536 | cur = path->nodes[*level]; |
| 3537 | ret = btrfs_lookup_extent_ref(trans, root, cur->start, cur->len, |
| 3538 | &refs); |
| 3539 | BUG_ON(ret); |
| 3540 | if (refs > 1) |
| 3541 | goto out; |
| 3542 | |
| 3543 | while (*level >= 0) { |
| 3544 | cur = path->nodes[*level]; |
| 3545 | if (*level == 0) { |
| 3546 | ret = btrfs_drop_leaf_ref(trans, root, cur); |
| 3547 | BUG_ON(ret); |
| 3548 | clean_tree_block(trans, root, cur); |
| 3549 | break; |
| 3550 | } |
| 3551 | if (path->slots[*level] >= btrfs_header_nritems(cur)) { |
| 3552 | clean_tree_block(trans, root, cur); |
| 3553 | break; |
| 3554 | } |
| 3555 | |
| 3556 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
| 3557 | blocksize = btrfs_level_size(root, *level - 1); |
| 3558 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
| 3559 | |
| 3560 | next = read_tree_block(root, bytenr, blocksize, ptr_gen); |
| 3561 | btrfs_tree_lock(next); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 3562 | btrfs_set_lock_blocking(next); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3563 | |
| 3564 | ret = btrfs_lookup_extent_ref(trans, root, bytenr, blocksize, |
| 3565 | &refs); |
| 3566 | BUG_ON(ret); |
| 3567 | if (refs > 1) { |
| 3568 | parent = path->nodes[*level]; |
| 3569 | ret = btrfs_free_extent(trans, root, bytenr, |
| 3570 | blocksize, parent->start, |
| 3571 | btrfs_header_owner(parent), |
| 3572 | btrfs_header_generation(parent), |
| 3573 | *level - 1, 1); |
| 3574 | BUG_ON(ret); |
| 3575 | path->slots[*level]++; |
| 3576 | btrfs_tree_unlock(next); |
| 3577 | free_extent_buffer(next); |
| 3578 | continue; |
| 3579 | } |
| 3580 | |
| 3581 | *level = btrfs_header_level(next); |
| 3582 | path->nodes[*level] = next; |
| 3583 | path->slots[*level] = 0; |
| 3584 | path->locks[*level] = 1; |
| 3585 | cond_resched(); |
| 3586 | } |
| 3587 | out: |
| 3588 | parent = path->nodes[*level + 1]; |
| 3589 | bytenr = path->nodes[*level]->start; |
| 3590 | blocksize = path->nodes[*level]->len; |
| 3591 | |
| 3592 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, |
| 3593 | parent->start, btrfs_header_owner(parent), |
| 3594 | btrfs_header_generation(parent), *level, 1); |
| 3595 | BUG_ON(ret); |
| 3596 | |
| 3597 | if (path->locks[*level]) { |
| 3598 | btrfs_tree_unlock(path->nodes[*level]); |
| 3599 | path->locks[*level] = 0; |
| 3600 | } |
| 3601 | free_extent_buffer(path->nodes[*level]); |
| 3602 | path->nodes[*level] = NULL; |
| 3603 | *level += 1; |
| 3604 | cond_resched(); |
| 3605 | return 0; |
| 3606 | } |
| 3607 | |
| 3608 | /* |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3609 | * helper for dropping snapshots. This walks back up the tree in the path |
| 3610 | * to find the first node higher up where we haven't yet gone through |
| 3611 | * all the slots |
| 3612 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3613 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 3614 | struct btrfs_root *root, |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3615 | struct btrfs_path *path, |
| 3616 | int *level, int max_level) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3617 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3618 | u64 root_owner; |
| 3619 | u64 root_gen; |
| 3620 | struct btrfs_root_item *root_item = &root->root_item; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3621 | int i; |
| 3622 | int slot; |
| 3623 | int ret; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3624 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3625 | for (i = *level; i < max_level && path->nodes[i]; i++) { |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3626 | slot = path->slots[i]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3627 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { |
| 3628 | struct extent_buffer *node; |
| 3629 | struct btrfs_disk_key disk_key; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3630 | |
| 3631 | /* |
| 3632 | * there is more work to do in this level. |
| 3633 | * Update the drop_progress marker to reflect |
| 3634 | * the work we've done so far, and then bump |
| 3635 | * the slot number |
| 3636 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3637 | node = path->nodes[i]; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3638 | path->slots[i]++; |
| 3639 | *level = i; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3640 | WARN_ON(*level == 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3641 | btrfs_node_key(node, &disk_key, path->slots[i]); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3642 | memcpy(&root_item->drop_progress, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3643 | &disk_key, sizeof(disk_key)); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3644 | root_item->drop_level = i; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3645 | return 0; |
| 3646 | } else { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3647 | struct extent_buffer *parent; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3648 | |
| 3649 | /* |
| 3650 | * this whole node is done, free our reference |
| 3651 | * on it and go up one level |
| 3652 | */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3653 | if (path->nodes[*level] == root->node) |
| 3654 | parent = path->nodes[*level]; |
| 3655 | else |
| 3656 | parent = path->nodes[*level + 1]; |
| 3657 | |
| 3658 | root_owner = btrfs_header_owner(parent); |
| 3659 | root_gen = btrfs_header_generation(parent); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3660 | |
| 3661 | clean_tree_block(trans, root, path->nodes[*level]); |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 3662 | ret = btrfs_free_extent(trans, root, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3663 | path->nodes[*level]->start, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3664 | path->nodes[*level]->len, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3665 | parent->start, root_owner, |
| 3666 | root_gen, *level, 1); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3667 | BUG_ON(ret); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3668 | if (path->locks[*level]) { |
| 3669 | btrfs_tree_unlock(path->nodes[*level]); |
| 3670 | path->locks[*level] = 0; |
| 3671 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3672 | free_extent_buffer(path->nodes[*level]); |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 3673 | path->nodes[*level] = NULL; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3674 | *level = i + 1; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3675 | } |
| 3676 | } |
| 3677 | return 1; |
| 3678 | } |
| 3679 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3680 | /* |
| 3681 | * drop the reference count on the tree rooted at 'snap'. This traverses |
| 3682 | * the tree freeing any blocks that have a ref count of zero after being |
| 3683 | * decremented. |
| 3684 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 3685 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3686 | *root) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3687 | { |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 3688 | int ret = 0; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3689 | int wret; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3690 | int level; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3691 | struct btrfs_path *path; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3692 | int i; |
| 3693 | int orig_level; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 3694 | int update_count; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3695 | struct btrfs_root_item *root_item = &root->root_item; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3696 | |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3697 | WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex)); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3698 | path = btrfs_alloc_path(); |
| 3699 | BUG_ON(!path); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3700 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3701 | level = btrfs_header_level(root->node); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3702 | orig_level = level; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3703 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
| 3704 | path->nodes[level] = root->node; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 3705 | extent_buffer_get(root->node); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3706 | path->slots[level] = 0; |
| 3707 | } else { |
| 3708 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3709 | struct btrfs_disk_key found_key; |
| 3710 | struct extent_buffer *node; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 3711 | |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3712 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 3713 | level = root_item->drop_level; |
| 3714 | path->lowest_level = level; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3715 | wret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 3716 | if (wret < 0) { |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3717 | ret = wret; |
| 3718 | goto out; |
| 3719 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3720 | node = path->nodes[level]; |
| 3721 | btrfs_node_key(node, &found_key, path->slots[level]); |
| 3722 | WARN_ON(memcmp(&found_key, &root_item->drop_progress, |
| 3723 | sizeof(found_key))); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 3724 | /* |
| 3725 | * unlock our path, this is safe because only this |
| 3726 | * function is allowed to delete this snapshot |
| 3727 | */ |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3728 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) { |
| 3729 | if (path->nodes[i] && path->locks[i]) { |
| 3730 | path->locks[i] = 0; |
| 3731 | btrfs_tree_unlock(path->nodes[i]); |
| 3732 | } |
| 3733 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3734 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3735 | while (1) { |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 3736 | unsigned long update; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3737 | wret = walk_down_tree(trans, root, path, &level); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3738 | if (wret > 0) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3739 | break; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3740 | if (wret < 0) |
| 3741 | ret = wret; |
| 3742 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3743 | wret = walk_up_tree(trans, root, path, &level, |
| 3744 | BTRFS_MAX_LEVEL); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3745 | if (wret > 0) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3746 | break; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3747 | if (wret < 0) |
| 3748 | ret = wret; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 3749 | if (trans->transaction->in_commit || |
| 3750 | trans->transaction->delayed_refs.flushing) { |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 3751 | ret = -EAGAIN; |
| 3752 | break; |
| 3753 | } |
Chris Mason | 18e35e0a | 2008-08-01 13:11:41 -0400 | [diff] [blame] | 3754 | atomic_inc(&root->fs_info->throttle_gen); |
Chris Mason | 017e536 | 2008-07-28 15:32:51 -0400 | [diff] [blame] | 3755 | wake_up(&root->fs_info->transaction_throttle); |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 3756 | for (update_count = 0; update_count < 16; update_count++) { |
| 3757 | update = trans->delayed_ref_updates; |
| 3758 | trans->delayed_ref_updates = 0; |
| 3759 | if (update) |
| 3760 | btrfs_run_delayed_refs(trans, root, update); |
| 3761 | else |
| 3762 | break; |
| 3763 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3764 | } |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 3765 | for (i = 0; i <= orig_level; i++) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3766 | if (path->nodes[i]) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3767 | free_extent_buffer(path->nodes[i]); |
Chris Mason | 0f82731 | 2007-10-15 16:18:56 -0400 | [diff] [blame] | 3768 | path->nodes[i] = NULL; |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 3769 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3770 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 3771 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3772 | btrfs_free_path(path); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3773 | return ret; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3774 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3775 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3776 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
| 3777 | struct btrfs_root *root, |
| 3778 | struct extent_buffer *node, |
| 3779 | struct extent_buffer *parent) |
| 3780 | { |
| 3781 | struct btrfs_path *path; |
| 3782 | int level; |
| 3783 | int parent_level; |
| 3784 | int ret = 0; |
| 3785 | int wret; |
| 3786 | |
| 3787 | path = btrfs_alloc_path(); |
| 3788 | BUG_ON(!path); |
| 3789 | |
Chris Mason | b9447ef | 2009-03-09 11:45:38 -0400 | [diff] [blame] | 3790 | btrfs_assert_tree_locked(parent); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3791 | parent_level = btrfs_header_level(parent); |
| 3792 | extent_buffer_get(parent); |
| 3793 | path->nodes[parent_level] = parent; |
| 3794 | path->slots[parent_level] = btrfs_header_nritems(parent); |
| 3795 | |
Chris Mason | b9447ef | 2009-03-09 11:45:38 -0400 | [diff] [blame] | 3796 | btrfs_assert_tree_locked(node); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3797 | level = btrfs_header_level(node); |
| 3798 | extent_buffer_get(node); |
| 3799 | path->nodes[level] = node; |
| 3800 | path->slots[level] = 0; |
| 3801 | |
| 3802 | while (1) { |
| 3803 | wret = walk_down_subtree(trans, root, path, &level); |
| 3804 | if (wret < 0) |
| 3805 | ret = wret; |
| 3806 | if (wret != 0) |
| 3807 | break; |
| 3808 | |
| 3809 | wret = walk_up_tree(trans, root, path, &level, parent_level); |
| 3810 | if (wret < 0) |
| 3811 | ret = wret; |
| 3812 | if (wret != 0) |
| 3813 | break; |
| 3814 | } |
| 3815 | |
| 3816 | btrfs_free_path(path); |
| 3817 | return ret; |
| 3818 | } |
| 3819 | |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 3820 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
| 3821 | unsigned long nr) |
| 3822 | { |
| 3823 | return min(last, start + nr - 1); |
| 3824 | } |
| 3825 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3826 | static noinline int relocate_inode_pages(struct inode *inode, u64 start, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 3827 | u64 len) |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3828 | { |
| 3829 | u64 page_start; |
| 3830 | u64 page_end; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3831 | unsigned long first_index; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3832 | unsigned long last_index; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3833 | unsigned long i; |
| 3834 | struct page *page; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 3835 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 3836 | struct file_ra_state *ra; |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 3837 | struct btrfs_ordered_extent *ordered; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3838 | unsigned int total_read = 0; |
| 3839 | unsigned int total_dirty = 0; |
| 3840 | int ret = 0; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 3841 | |
| 3842 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3843 | |
| 3844 | mutex_lock(&inode->i_mutex); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3845 | first_index = start >> PAGE_CACHE_SHIFT; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3846 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
| 3847 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3848 | /* make sure the dirty trick played by the caller work */ |
| 3849 | ret = invalidate_inode_pages2_range(inode->i_mapping, |
| 3850 | first_index, last_index); |
| 3851 | if (ret) |
| 3852 | goto out_unlock; |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 3853 | |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 3854 | file_ra_state_init(ra, inode->i_mapping); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3855 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3856 | for (i = first_index ; i <= last_index; i++) { |
| 3857 | if (total_read % ra->ra_pages == 0) { |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 3858 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3859 | calc_ra(i, last_index, ra->ra_pages)); |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 3860 | } |
| 3861 | total_read++; |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 3862 | again: |
| 3863 | if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3864 | BUG_ON(1); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3865 | page = grab_cache_page(inode->i_mapping, i); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3866 | if (!page) { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3867 | ret = -ENOMEM; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3868 | goto out_unlock; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3869 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3870 | if (!PageUptodate(page)) { |
| 3871 | btrfs_readpage(NULL, page); |
| 3872 | lock_page(page); |
| 3873 | if (!PageUptodate(page)) { |
| 3874 | unlock_page(page); |
| 3875 | page_cache_release(page); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3876 | ret = -EIO; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3877 | goto out_unlock; |
| 3878 | } |
| 3879 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3880 | wait_on_page_writeback(page); |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 3881 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3882 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
| 3883 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 3884 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3885 | |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 3886 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 3887 | if (ordered) { |
| 3888 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
| 3889 | unlock_page(page); |
| 3890 | page_cache_release(page); |
| 3891 | btrfs_start_ordered_extent(inode, ordered, 1); |
| 3892 | btrfs_put_ordered_extent(ordered); |
| 3893 | goto again; |
| 3894 | } |
| 3895 | set_page_extent_mapped(page); |
| 3896 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3897 | if (i == first_index) |
| 3898 | set_extent_bits(io_tree, page_start, page_end, |
| 3899 | EXTENT_BOUNDARY, GFP_NOFS); |
Yan Zheng | 1f80e4d | 2008-12-19 10:59:04 -0500 | [diff] [blame] | 3900 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3901 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3902 | set_page_dirty(page); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3903 | total_dirty++; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3904 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 3905 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3906 | unlock_page(page); |
| 3907 | page_cache_release(page); |
| 3908 | } |
| 3909 | |
| 3910 | out_unlock: |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3911 | kfree(ra); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3912 | mutex_unlock(&inode->i_mutex); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3913 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty); |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 3914 | return ret; |
| 3915 | } |
| 3916 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3917 | static noinline int relocate_data_extent(struct inode *reloc_inode, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3918 | struct btrfs_key *extent_key, |
| 3919 | u64 offset) |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3920 | { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3921 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; |
| 3922 | struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree; |
| 3923 | struct extent_map *em; |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 3924 | u64 start = extent_key->objectid - offset; |
| 3925 | u64 end = start + extent_key->offset - 1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3926 | |
| 3927 | em = alloc_extent_map(GFP_NOFS); |
| 3928 | BUG_ON(!em || IS_ERR(em)); |
| 3929 | |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 3930 | em->start = start; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3931 | em->len = extent_key->offset; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 3932 | em->block_len = extent_key->offset; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3933 | em->block_start = extent_key->objectid; |
| 3934 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
| 3935 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
| 3936 | |
| 3937 | /* setup extent map to cheat btrfs_readpage */ |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 3938 | lock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3939 | while (1) { |
| 3940 | int ret; |
| 3941 | spin_lock(&em_tree->lock); |
| 3942 | ret = add_extent_mapping(em_tree, em); |
| 3943 | spin_unlock(&em_tree->lock); |
| 3944 | if (ret != -EEXIST) { |
| 3945 | free_extent_map(em); |
| 3946 | break; |
| 3947 | } |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 3948 | btrfs_drop_extent_cache(reloc_inode, start, end, 0); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3949 | } |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 3950 | unlock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3951 | |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 3952 | return relocate_inode_pages(reloc_inode, start, extent_key->offset); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3953 | } |
| 3954 | |
| 3955 | struct btrfs_ref_path { |
| 3956 | u64 extent_start; |
| 3957 | u64 nodes[BTRFS_MAX_LEVEL]; |
| 3958 | u64 root_objectid; |
| 3959 | u64 root_generation; |
| 3960 | u64 owner_objectid; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3961 | u32 num_refs; |
| 3962 | int lowest_level; |
| 3963 | int current_level; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3964 | int shared_level; |
| 3965 | |
| 3966 | struct btrfs_key node_keys[BTRFS_MAX_LEVEL]; |
| 3967 | u64 new_nodes[BTRFS_MAX_LEVEL]; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3968 | }; |
| 3969 | |
| 3970 | struct disk_extent { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 3971 | u64 ram_bytes; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3972 | u64 disk_bytenr; |
| 3973 | u64 disk_num_bytes; |
| 3974 | u64 offset; |
| 3975 | u64 num_bytes; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 3976 | u8 compression; |
| 3977 | u8 encryption; |
| 3978 | u16 other_encoding; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3979 | }; |
| 3980 | |
| 3981 | static int is_cowonly_root(u64 root_objectid) |
| 3982 | { |
| 3983 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || |
| 3984 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || |
| 3985 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || |
| 3986 | root_objectid == BTRFS_DEV_TREE_OBJECTID || |
Yan Zheng | 0403e47 | 2008-12-10 20:32:51 -0500 | [diff] [blame] | 3987 | root_objectid == BTRFS_TREE_LOG_OBJECTID || |
| 3988 | root_objectid == BTRFS_CSUM_TREE_OBJECTID) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3989 | return 1; |
| 3990 | return 0; |
| 3991 | } |
| 3992 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3993 | static noinline int __next_ref_path(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3994 | struct btrfs_root *extent_root, |
| 3995 | struct btrfs_ref_path *ref_path, |
| 3996 | int first_time) |
| 3997 | { |
| 3998 | struct extent_buffer *leaf; |
| 3999 | struct btrfs_path *path; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 4000 | struct btrfs_extent_ref *ref; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4001 | struct btrfs_key key; |
| 4002 | struct btrfs_key found_key; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4003 | u64 bytenr; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4004 | u32 nritems; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4005 | int level; |
| 4006 | int ret = 1; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4007 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4008 | path = btrfs_alloc_path(); |
| 4009 | if (!path) |
| 4010 | return -ENOMEM; |
| 4011 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4012 | if (first_time) { |
| 4013 | ref_path->lowest_level = -1; |
| 4014 | ref_path->current_level = -1; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4015 | ref_path->shared_level = -1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4016 | goto walk_up; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4017 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4018 | walk_down: |
| 4019 | level = ref_path->current_level - 1; |
| 4020 | while (level >= -1) { |
| 4021 | u64 parent; |
| 4022 | if (level < ref_path->lowest_level) |
| 4023 | break; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4024 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4025 | if (level >= 0) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4026 | bytenr = ref_path->nodes[level]; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4027 | else |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4028 | bytenr = ref_path->extent_start; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4029 | BUG_ON(bytenr == 0); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4030 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4031 | parent = ref_path->nodes[level + 1]; |
| 4032 | ref_path->nodes[level + 1] = 0; |
| 4033 | ref_path->current_level = level; |
| 4034 | BUG_ON(parent == 0); |
| 4035 | |
| 4036 | key.objectid = bytenr; |
| 4037 | key.offset = parent + 1; |
| 4038 | key.type = BTRFS_EXTENT_REF_KEY; |
| 4039 | |
| 4040 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4041 | if (ret < 0) |
| 4042 | goto out; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4043 | BUG_ON(ret == 0); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4044 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4045 | leaf = path->nodes[0]; |
| 4046 | nritems = btrfs_header_nritems(leaf); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4047 | if (path->slots[0] >= nritems) { |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4048 | ret = btrfs_next_leaf(extent_root, path); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4049 | if (ret < 0) |
| 4050 | goto out; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4051 | if (ret > 0) |
| 4052 | goto next; |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 4053 | leaf = path->nodes[0]; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4054 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4055 | |
| 4056 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4057 | if (found_key.objectid == bytenr && |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4058 | found_key.type == BTRFS_EXTENT_REF_KEY) { |
| 4059 | if (level < ref_path->shared_level) |
| 4060 | ref_path->shared_level = level; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4061 | goto found; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4062 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4063 | next: |
| 4064 | level--; |
| 4065 | btrfs_release_path(extent_root, path); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4066 | cond_resched(); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4067 | } |
| 4068 | /* reached lowest level */ |
| 4069 | ret = 1; |
| 4070 | goto out; |
| 4071 | walk_up: |
| 4072 | level = ref_path->current_level; |
| 4073 | while (level < BTRFS_MAX_LEVEL - 1) { |
| 4074 | u64 ref_objectid; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4075 | |
| 4076 | if (level >= 0) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4077 | bytenr = ref_path->nodes[level]; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4078 | else |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4079 | bytenr = ref_path->extent_start; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4080 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4081 | BUG_ON(bytenr == 0); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4082 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4083 | key.objectid = bytenr; |
| 4084 | key.offset = 0; |
| 4085 | key.type = BTRFS_EXTENT_REF_KEY; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4086 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4087 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
| 4088 | if (ret < 0) |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4089 | goto out; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4090 | |
| 4091 | leaf = path->nodes[0]; |
| 4092 | nritems = btrfs_header_nritems(leaf); |
| 4093 | if (path->slots[0] >= nritems) { |
| 4094 | ret = btrfs_next_leaf(extent_root, path); |
| 4095 | if (ret < 0) |
| 4096 | goto out; |
| 4097 | if (ret > 0) { |
| 4098 | /* the extent was freed by someone */ |
| 4099 | if (ref_path->lowest_level == level) |
| 4100 | goto out; |
| 4101 | btrfs_release_path(extent_root, path); |
| 4102 | goto walk_down; |
| 4103 | } |
| 4104 | leaf = path->nodes[0]; |
| 4105 | } |
| 4106 | |
| 4107 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 4108 | if (found_key.objectid != bytenr || |
| 4109 | found_key.type != BTRFS_EXTENT_REF_KEY) { |
| 4110 | /* the extent was freed by someone */ |
| 4111 | if (ref_path->lowest_level == level) { |
| 4112 | ret = 1; |
| 4113 | goto out; |
| 4114 | } |
| 4115 | btrfs_release_path(extent_root, path); |
| 4116 | goto walk_down; |
| 4117 | } |
| 4118 | found: |
| 4119 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 4120 | struct btrfs_extent_ref); |
| 4121 | ref_objectid = btrfs_ref_objectid(leaf, ref); |
| 4122 | if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
| 4123 | if (first_time) { |
| 4124 | level = (int)ref_objectid; |
| 4125 | BUG_ON(level >= BTRFS_MAX_LEVEL); |
| 4126 | ref_path->lowest_level = level; |
| 4127 | ref_path->current_level = level; |
| 4128 | ref_path->nodes[level] = bytenr; |
| 4129 | } else { |
| 4130 | WARN_ON(ref_objectid != level); |
| 4131 | } |
| 4132 | } else { |
| 4133 | WARN_ON(level != -1); |
| 4134 | } |
| 4135 | first_time = 0; |
| 4136 | |
| 4137 | if (ref_path->lowest_level == level) { |
| 4138 | ref_path->owner_objectid = ref_objectid; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4139 | ref_path->num_refs = btrfs_ref_num_refs(leaf, ref); |
| 4140 | } |
| 4141 | |
| 4142 | /* |
| 4143 | * the block is tree root or the block isn't in reference |
| 4144 | * counted tree. |
| 4145 | */ |
| 4146 | if (found_key.objectid == found_key.offset || |
| 4147 | is_cowonly_root(btrfs_ref_root(leaf, ref))) { |
| 4148 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); |
| 4149 | ref_path->root_generation = |
| 4150 | btrfs_ref_generation(leaf, ref); |
| 4151 | if (level < 0) { |
| 4152 | /* special reference from the tree log */ |
| 4153 | ref_path->nodes[0] = found_key.offset; |
| 4154 | ref_path->current_level = 0; |
| 4155 | } |
| 4156 | ret = 0; |
| 4157 | goto out; |
| 4158 | } |
| 4159 | |
| 4160 | level++; |
| 4161 | BUG_ON(ref_path->nodes[level] != 0); |
| 4162 | ref_path->nodes[level] = found_key.offset; |
| 4163 | ref_path->current_level = level; |
| 4164 | |
| 4165 | /* |
| 4166 | * the reference was created in the running transaction, |
| 4167 | * no need to continue walking up. |
| 4168 | */ |
| 4169 | if (btrfs_ref_generation(leaf, ref) == trans->transid) { |
| 4170 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); |
| 4171 | ref_path->root_generation = |
| 4172 | btrfs_ref_generation(leaf, ref); |
| 4173 | ret = 0; |
| 4174 | goto out; |
| 4175 | } |
| 4176 | |
| 4177 | btrfs_release_path(extent_root, path); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4178 | cond_resched(); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4179 | } |
| 4180 | /* reached max tree level, but no tree root found. */ |
| 4181 | BUG(); |
| 4182 | out: |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4183 | btrfs_free_path(path); |
| 4184 | return ret; |
| 4185 | } |
| 4186 | |
| 4187 | static int btrfs_first_ref_path(struct btrfs_trans_handle *trans, |
| 4188 | struct btrfs_root *extent_root, |
| 4189 | struct btrfs_ref_path *ref_path, |
| 4190 | u64 extent_start) |
| 4191 | { |
| 4192 | memset(ref_path, 0, sizeof(*ref_path)); |
| 4193 | ref_path->extent_start = extent_start; |
| 4194 | |
| 4195 | return __next_ref_path(trans, extent_root, ref_path, 1); |
| 4196 | } |
| 4197 | |
| 4198 | static int btrfs_next_ref_path(struct btrfs_trans_handle *trans, |
| 4199 | struct btrfs_root *extent_root, |
| 4200 | struct btrfs_ref_path *ref_path) |
| 4201 | { |
| 4202 | return __next_ref_path(trans, extent_root, ref_path, 0); |
| 4203 | } |
| 4204 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4205 | static noinline int get_new_locations(struct inode *reloc_inode, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4206 | struct btrfs_key *extent_key, |
| 4207 | u64 offset, int no_fragment, |
| 4208 | struct disk_extent **extents, |
| 4209 | int *nr_extents) |
| 4210 | { |
| 4211 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; |
| 4212 | struct btrfs_path *path; |
| 4213 | struct btrfs_file_extent_item *fi; |
| 4214 | struct extent_buffer *leaf; |
| 4215 | struct disk_extent *exts = *extents; |
| 4216 | struct btrfs_key found_key; |
| 4217 | u64 cur_pos; |
| 4218 | u64 last_byte; |
| 4219 | u32 nritems; |
| 4220 | int nr = 0; |
| 4221 | int max = *nr_extents; |
| 4222 | int ret; |
| 4223 | |
| 4224 | WARN_ON(!no_fragment && *extents); |
| 4225 | if (!exts) { |
| 4226 | max = 1; |
| 4227 | exts = kmalloc(sizeof(*exts) * max, GFP_NOFS); |
| 4228 | if (!exts) |
| 4229 | return -ENOMEM; |
| 4230 | } |
| 4231 | |
| 4232 | path = btrfs_alloc_path(); |
| 4233 | BUG_ON(!path); |
| 4234 | |
| 4235 | cur_pos = extent_key->objectid - offset; |
| 4236 | last_byte = extent_key->objectid + extent_key->offset; |
| 4237 | ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino, |
| 4238 | cur_pos, 0); |
| 4239 | if (ret < 0) |
| 4240 | goto out; |
| 4241 | if (ret > 0) { |
| 4242 | ret = -ENOENT; |
| 4243 | goto out; |
| 4244 | } |
| 4245 | |
| 4246 | while (1) { |
| 4247 | leaf = path->nodes[0]; |
| 4248 | nritems = btrfs_header_nritems(leaf); |
| 4249 | if (path->slots[0] >= nritems) { |
| 4250 | ret = btrfs_next_leaf(root, path); |
| 4251 | if (ret < 0) |
| 4252 | goto out; |
| 4253 | if (ret > 0) |
| 4254 | break; |
| 4255 | leaf = path->nodes[0]; |
| 4256 | } |
| 4257 | |
| 4258 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 4259 | if (found_key.offset != cur_pos || |
| 4260 | found_key.type != BTRFS_EXTENT_DATA_KEY || |
| 4261 | found_key.objectid != reloc_inode->i_ino) |
| 4262 | break; |
| 4263 | |
| 4264 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 4265 | struct btrfs_file_extent_item); |
| 4266 | if (btrfs_file_extent_type(leaf, fi) != |
| 4267 | BTRFS_FILE_EXTENT_REG || |
| 4268 | btrfs_file_extent_disk_bytenr(leaf, fi) == 0) |
| 4269 | break; |
| 4270 | |
| 4271 | if (nr == max) { |
| 4272 | struct disk_extent *old = exts; |
| 4273 | max *= 2; |
| 4274 | exts = kzalloc(sizeof(*exts) * max, GFP_NOFS); |
| 4275 | memcpy(exts, old, sizeof(*exts) * nr); |
| 4276 | if (old != *extents) |
| 4277 | kfree(old); |
| 4278 | } |
| 4279 | |
| 4280 | exts[nr].disk_bytenr = |
| 4281 | btrfs_file_extent_disk_bytenr(leaf, fi); |
| 4282 | exts[nr].disk_num_bytes = |
| 4283 | btrfs_file_extent_disk_num_bytes(leaf, fi); |
| 4284 | exts[nr].offset = btrfs_file_extent_offset(leaf, fi); |
| 4285 | exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4286 | exts[nr].ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
| 4287 | exts[nr].compression = btrfs_file_extent_compression(leaf, fi); |
| 4288 | exts[nr].encryption = btrfs_file_extent_encryption(leaf, fi); |
| 4289 | exts[nr].other_encoding = btrfs_file_extent_other_encoding(leaf, |
| 4290 | fi); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4291 | BUG_ON(exts[nr].offset > 0); |
| 4292 | BUG_ON(exts[nr].compression || exts[nr].encryption); |
| 4293 | BUG_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4294 | |
| 4295 | cur_pos += exts[nr].num_bytes; |
| 4296 | nr++; |
| 4297 | |
| 4298 | if (cur_pos + offset >= last_byte) |
| 4299 | break; |
| 4300 | |
| 4301 | if (no_fragment) { |
| 4302 | ret = 1; |
| 4303 | goto out; |
| 4304 | } |
| 4305 | path->slots[0]++; |
| 4306 | } |
| 4307 | |
Yan Zheng | 1f80e4d | 2008-12-19 10:59:04 -0500 | [diff] [blame] | 4308 | BUG_ON(cur_pos + offset > last_byte); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4309 | if (cur_pos + offset < last_byte) { |
| 4310 | ret = -ENOENT; |
| 4311 | goto out; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4312 | } |
| 4313 | ret = 0; |
| 4314 | out: |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4315 | btrfs_free_path(path); |
| 4316 | if (ret) { |
| 4317 | if (exts != *extents) |
| 4318 | kfree(exts); |
| 4319 | } else { |
| 4320 | *extents = exts; |
| 4321 | *nr_extents = nr; |
| 4322 | } |
| 4323 | return ret; |
| 4324 | } |
| 4325 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4326 | static noinline int replace_one_extent(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4327 | struct btrfs_root *root, |
| 4328 | struct btrfs_path *path, |
| 4329 | struct btrfs_key *extent_key, |
| 4330 | struct btrfs_key *leaf_key, |
| 4331 | struct btrfs_ref_path *ref_path, |
| 4332 | struct disk_extent *new_extents, |
| 4333 | int nr_extents) |
| 4334 | { |
| 4335 | struct extent_buffer *leaf; |
| 4336 | struct btrfs_file_extent_item *fi; |
| 4337 | struct inode *inode = NULL; |
| 4338 | struct btrfs_key key; |
| 4339 | u64 lock_start = 0; |
| 4340 | u64 lock_end = 0; |
| 4341 | u64 num_bytes; |
| 4342 | u64 ext_offset; |
Yan Zheng | 86288a1 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 4343 | u64 search_end = (u64)-1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4344 | u32 nritems; |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4345 | int nr_scaned = 0; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4346 | int extent_locked = 0; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4347 | int extent_type; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4348 | int ret; |
| 4349 | |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4350 | memcpy(&key, leaf_key, sizeof(key)); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4351 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4352 | if (key.objectid < ref_path->owner_objectid || |
| 4353 | (key.objectid == ref_path->owner_objectid && |
| 4354 | key.type < BTRFS_EXTENT_DATA_KEY)) { |
| 4355 | key.objectid = ref_path->owner_objectid; |
| 4356 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 4357 | key.offset = 0; |
| 4358 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4359 | } |
| 4360 | |
| 4361 | while (1) { |
| 4362 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 4363 | if (ret < 0) |
| 4364 | goto out; |
| 4365 | |
| 4366 | leaf = path->nodes[0]; |
| 4367 | nritems = btrfs_header_nritems(leaf); |
| 4368 | next: |
| 4369 | if (extent_locked && ret > 0) { |
| 4370 | /* |
| 4371 | * the file extent item was modified by someone |
| 4372 | * before the extent got locked. |
| 4373 | */ |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4374 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
| 4375 | lock_end, GFP_NOFS); |
| 4376 | extent_locked = 0; |
| 4377 | } |
| 4378 | |
| 4379 | if (path->slots[0] >= nritems) { |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4380 | if (++nr_scaned > 2) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4381 | break; |
| 4382 | |
| 4383 | BUG_ON(extent_locked); |
| 4384 | ret = btrfs_next_leaf(root, path); |
| 4385 | if (ret < 0) |
| 4386 | goto out; |
| 4387 | if (ret > 0) |
| 4388 | break; |
| 4389 | leaf = path->nodes[0]; |
| 4390 | nritems = btrfs_header_nritems(leaf); |
| 4391 | } |
| 4392 | |
| 4393 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 4394 | |
| 4395 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
| 4396 | if ((key.objectid > ref_path->owner_objectid) || |
| 4397 | (key.objectid == ref_path->owner_objectid && |
| 4398 | key.type > BTRFS_EXTENT_DATA_KEY) || |
Yan Zheng | 86288a1 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 4399 | key.offset >= search_end) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4400 | break; |
| 4401 | } |
| 4402 | |
| 4403 | if (inode && key.objectid != inode->i_ino) { |
| 4404 | BUG_ON(extent_locked); |
| 4405 | btrfs_release_path(root, path); |
| 4406 | mutex_unlock(&inode->i_mutex); |
| 4407 | iput(inode); |
| 4408 | inode = NULL; |
| 4409 | continue; |
| 4410 | } |
| 4411 | |
| 4412 | if (key.type != BTRFS_EXTENT_DATA_KEY) { |
| 4413 | path->slots[0]++; |
| 4414 | ret = 1; |
| 4415 | goto next; |
| 4416 | } |
| 4417 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 4418 | struct btrfs_file_extent_item); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4419 | extent_type = btrfs_file_extent_type(leaf, fi); |
| 4420 | if ((extent_type != BTRFS_FILE_EXTENT_REG && |
| 4421 | extent_type != BTRFS_FILE_EXTENT_PREALLOC) || |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4422 | (btrfs_file_extent_disk_bytenr(leaf, fi) != |
| 4423 | extent_key->objectid)) { |
| 4424 | path->slots[0]++; |
| 4425 | ret = 1; |
| 4426 | goto next; |
| 4427 | } |
| 4428 | |
| 4429 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); |
| 4430 | ext_offset = btrfs_file_extent_offset(leaf, fi); |
| 4431 | |
Yan Zheng | 86288a1 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 4432 | if (search_end == (u64)-1) { |
| 4433 | search_end = key.offset - ext_offset + |
| 4434 | btrfs_file_extent_ram_bytes(leaf, fi); |
| 4435 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4436 | |
| 4437 | if (!extent_locked) { |
| 4438 | lock_start = key.offset; |
| 4439 | lock_end = lock_start + num_bytes - 1; |
| 4440 | } else { |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 4441 | if (lock_start > key.offset || |
| 4442 | lock_end + 1 < key.offset + num_bytes) { |
| 4443 | unlock_extent(&BTRFS_I(inode)->io_tree, |
| 4444 | lock_start, lock_end, GFP_NOFS); |
| 4445 | extent_locked = 0; |
| 4446 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4447 | } |
| 4448 | |
| 4449 | if (!inode) { |
| 4450 | btrfs_release_path(root, path); |
| 4451 | |
| 4452 | inode = btrfs_iget_locked(root->fs_info->sb, |
| 4453 | key.objectid, root); |
| 4454 | if (inode->i_state & I_NEW) { |
| 4455 | BTRFS_I(inode)->root = root; |
| 4456 | BTRFS_I(inode)->location.objectid = |
| 4457 | key.objectid; |
| 4458 | BTRFS_I(inode)->location.type = |
| 4459 | BTRFS_INODE_ITEM_KEY; |
| 4460 | BTRFS_I(inode)->location.offset = 0; |
| 4461 | btrfs_read_locked_inode(inode); |
| 4462 | unlock_new_inode(inode); |
| 4463 | } |
| 4464 | /* |
| 4465 | * some code call btrfs_commit_transaction while |
| 4466 | * holding the i_mutex, so we can't use mutex_lock |
| 4467 | * here. |
| 4468 | */ |
| 4469 | if (is_bad_inode(inode) || |
| 4470 | !mutex_trylock(&inode->i_mutex)) { |
| 4471 | iput(inode); |
| 4472 | inode = NULL; |
| 4473 | key.offset = (u64)-1; |
| 4474 | goto skip; |
| 4475 | } |
| 4476 | } |
| 4477 | |
| 4478 | if (!extent_locked) { |
| 4479 | struct btrfs_ordered_extent *ordered; |
| 4480 | |
| 4481 | btrfs_release_path(root, path); |
| 4482 | |
| 4483 | lock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
| 4484 | lock_end, GFP_NOFS); |
| 4485 | ordered = btrfs_lookup_first_ordered_extent(inode, |
| 4486 | lock_end); |
| 4487 | if (ordered && |
| 4488 | ordered->file_offset <= lock_end && |
| 4489 | ordered->file_offset + ordered->len > lock_start) { |
| 4490 | unlock_extent(&BTRFS_I(inode)->io_tree, |
| 4491 | lock_start, lock_end, GFP_NOFS); |
| 4492 | btrfs_start_ordered_extent(inode, ordered, 1); |
| 4493 | btrfs_put_ordered_extent(ordered); |
| 4494 | key.offset += num_bytes; |
| 4495 | goto skip; |
| 4496 | } |
| 4497 | if (ordered) |
| 4498 | btrfs_put_ordered_extent(ordered); |
| 4499 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4500 | extent_locked = 1; |
| 4501 | continue; |
| 4502 | } |
| 4503 | |
| 4504 | if (nr_extents == 1) { |
| 4505 | /* update extent pointer in place */ |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4506 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
| 4507 | new_extents[0].disk_bytenr); |
| 4508 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, |
| 4509 | new_extents[0].disk_num_bytes); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4510 | btrfs_mark_buffer_dirty(leaf); |
| 4511 | |
| 4512 | btrfs_drop_extent_cache(inode, key.offset, |
| 4513 | key.offset + num_bytes - 1, 0); |
| 4514 | |
| 4515 | ret = btrfs_inc_extent_ref(trans, root, |
| 4516 | new_extents[0].disk_bytenr, |
| 4517 | new_extents[0].disk_num_bytes, |
| 4518 | leaf->start, |
| 4519 | root->root_key.objectid, |
| 4520 | trans->transid, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4521 | key.objectid); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4522 | BUG_ON(ret); |
| 4523 | |
| 4524 | ret = btrfs_free_extent(trans, root, |
| 4525 | extent_key->objectid, |
| 4526 | extent_key->offset, |
| 4527 | leaf->start, |
| 4528 | btrfs_header_owner(leaf), |
| 4529 | btrfs_header_generation(leaf), |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4530 | key.objectid, 0); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4531 | BUG_ON(ret); |
| 4532 | |
| 4533 | btrfs_release_path(root, path); |
| 4534 | key.offset += num_bytes; |
| 4535 | } else { |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4536 | BUG_ON(1); |
| 4537 | #if 0 |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4538 | u64 alloc_hint; |
| 4539 | u64 extent_len; |
| 4540 | int i; |
| 4541 | /* |
| 4542 | * drop old extent pointer at first, then insert the |
| 4543 | * new pointers one bye one |
| 4544 | */ |
| 4545 | btrfs_release_path(root, path); |
| 4546 | ret = btrfs_drop_extents(trans, root, inode, key.offset, |
| 4547 | key.offset + num_bytes, |
| 4548 | key.offset, &alloc_hint); |
| 4549 | BUG_ON(ret); |
| 4550 | |
| 4551 | for (i = 0; i < nr_extents; i++) { |
| 4552 | if (ext_offset >= new_extents[i].num_bytes) { |
| 4553 | ext_offset -= new_extents[i].num_bytes; |
| 4554 | continue; |
| 4555 | } |
| 4556 | extent_len = min(new_extents[i].num_bytes - |
| 4557 | ext_offset, num_bytes); |
| 4558 | |
| 4559 | ret = btrfs_insert_empty_item(trans, root, |
| 4560 | path, &key, |
| 4561 | sizeof(*fi)); |
| 4562 | BUG_ON(ret); |
| 4563 | |
| 4564 | leaf = path->nodes[0]; |
| 4565 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 4566 | struct btrfs_file_extent_item); |
| 4567 | btrfs_set_file_extent_generation(leaf, fi, |
| 4568 | trans->transid); |
| 4569 | btrfs_set_file_extent_type(leaf, fi, |
| 4570 | BTRFS_FILE_EXTENT_REG); |
| 4571 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
| 4572 | new_extents[i].disk_bytenr); |
| 4573 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, |
| 4574 | new_extents[i].disk_num_bytes); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4575 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
| 4576 | new_extents[i].ram_bytes); |
| 4577 | |
| 4578 | btrfs_set_file_extent_compression(leaf, fi, |
| 4579 | new_extents[i].compression); |
| 4580 | btrfs_set_file_extent_encryption(leaf, fi, |
| 4581 | new_extents[i].encryption); |
| 4582 | btrfs_set_file_extent_other_encoding(leaf, fi, |
| 4583 | new_extents[i].other_encoding); |
| 4584 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4585 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 4586 | extent_len); |
| 4587 | ext_offset += new_extents[i].offset; |
| 4588 | btrfs_set_file_extent_offset(leaf, fi, |
| 4589 | ext_offset); |
| 4590 | btrfs_mark_buffer_dirty(leaf); |
| 4591 | |
| 4592 | btrfs_drop_extent_cache(inode, key.offset, |
| 4593 | key.offset + extent_len - 1, 0); |
| 4594 | |
| 4595 | ret = btrfs_inc_extent_ref(trans, root, |
| 4596 | new_extents[i].disk_bytenr, |
| 4597 | new_extents[i].disk_num_bytes, |
| 4598 | leaf->start, |
| 4599 | root->root_key.objectid, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4600 | trans->transid, key.objectid); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4601 | BUG_ON(ret); |
| 4602 | btrfs_release_path(root, path); |
| 4603 | |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 4604 | inode_add_bytes(inode, extent_len); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4605 | |
| 4606 | ext_offset = 0; |
| 4607 | num_bytes -= extent_len; |
| 4608 | key.offset += extent_len; |
| 4609 | |
| 4610 | if (num_bytes == 0) |
| 4611 | break; |
| 4612 | } |
| 4613 | BUG_ON(i >= nr_extents); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4614 | #endif |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4615 | } |
| 4616 | |
| 4617 | if (extent_locked) { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4618 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
| 4619 | lock_end, GFP_NOFS); |
| 4620 | extent_locked = 0; |
| 4621 | } |
| 4622 | skip: |
| 4623 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS && |
Yan Zheng | 86288a1 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 4624 | key.offset >= search_end) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4625 | break; |
| 4626 | |
| 4627 | cond_resched(); |
| 4628 | } |
| 4629 | ret = 0; |
| 4630 | out: |
| 4631 | btrfs_release_path(root, path); |
| 4632 | if (inode) { |
| 4633 | mutex_unlock(&inode->i_mutex); |
| 4634 | if (extent_locked) { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4635 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
| 4636 | lock_end, GFP_NOFS); |
| 4637 | } |
| 4638 | iput(inode); |
| 4639 | } |
| 4640 | return ret; |
| 4641 | } |
| 4642 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4643 | int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, |
| 4644 | struct btrfs_root *root, |
| 4645 | struct extent_buffer *buf, u64 orig_start) |
| 4646 | { |
| 4647 | int level; |
| 4648 | int ret; |
| 4649 | |
| 4650 | BUG_ON(btrfs_header_generation(buf) != trans->transid); |
| 4651 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
| 4652 | |
| 4653 | level = btrfs_header_level(buf); |
| 4654 | if (level == 0) { |
| 4655 | struct btrfs_leaf_ref *ref; |
| 4656 | struct btrfs_leaf_ref *orig_ref; |
| 4657 | |
| 4658 | orig_ref = btrfs_lookup_leaf_ref(root, orig_start); |
| 4659 | if (!orig_ref) |
| 4660 | return -ENOENT; |
| 4661 | |
| 4662 | ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems); |
| 4663 | if (!ref) { |
| 4664 | btrfs_free_leaf_ref(root, orig_ref); |
| 4665 | return -ENOMEM; |
| 4666 | } |
| 4667 | |
| 4668 | ref->nritems = orig_ref->nritems; |
| 4669 | memcpy(ref->extents, orig_ref->extents, |
| 4670 | sizeof(ref->extents[0]) * ref->nritems); |
| 4671 | |
| 4672 | btrfs_free_leaf_ref(root, orig_ref); |
| 4673 | |
| 4674 | ref->root_gen = trans->transid; |
| 4675 | ref->bytenr = buf->start; |
| 4676 | ref->owner = btrfs_header_owner(buf); |
| 4677 | ref->generation = btrfs_header_generation(buf); |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 4678 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4679 | ret = btrfs_add_leaf_ref(root, ref, 0); |
| 4680 | WARN_ON(ret); |
| 4681 | btrfs_free_leaf_ref(root, ref); |
| 4682 | } |
| 4683 | return 0; |
| 4684 | } |
| 4685 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4686 | static noinline int invalidate_extent_cache(struct btrfs_root *root, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4687 | struct extent_buffer *leaf, |
| 4688 | struct btrfs_block_group_cache *group, |
| 4689 | struct btrfs_root *target_root) |
| 4690 | { |
| 4691 | struct btrfs_key key; |
| 4692 | struct inode *inode = NULL; |
| 4693 | struct btrfs_file_extent_item *fi; |
| 4694 | u64 num_bytes; |
| 4695 | u64 skip_objectid = 0; |
| 4696 | u32 nritems; |
| 4697 | u32 i; |
| 4698 | |
| 4699 | nritems = btrfs_header_nritems(leaf); |
| 4700 | for (i = 0; i < nritems; i++) { |
| 4701 | btrfs_item_key_to_cpu(leaf, &key, i); |
| 4702 | if (key.objectid == skip_objectid || |
| 4703 | key.type != BTRFS_EXTENT_DATA_KEY) |
| 4704 | continue; |
| 4705 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); |
| 4706 | if (btrfs_file_extent_type(leaf, fi) == |
| 4707 | BTRFS_FILE_EXTENT_INLINE) |
| 4708 | continue; |
| 4709 | if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0) |
| 4710 | continue; |
| 4711 | if (!inode || inode->i_ino != key.objectid) { |
| 4712 | iput(inode); |
| 4713 | inode = btrfs_ilookup(target_root->fs_info->sb, |
| 4714 | key.objectid, target_root, 1); |
| 4715 | } |
| 4716 | if (!inode) { |
| 4717 | skip_objectid = key.objectid; |
| 4718 | continue; |
| 4719 | } |
| 4720 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); |
| 4721 | |
| 4722 | lock_extent(&BTRFS_I(inode)->io_tree, key.offset, |
| 4723 | key.offset + num_bytes - 1, GFP_NOFS); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4724 | btrfs_drop_extent_cache(inode, key.offset, |
| 4725 | key.offset + num_bytes - 1, 1); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4726 | unlock_extent(&BTRFS_I(inode)->io_tree, key.offset, |
| 4727 | key.offset + num_bytes - 1, GFP_NOFS); |
| 4728 | cond_resched(); |
| 4729 | } |
| 4730 | iput(inode); |
| 4731 | return 0; |
| 4732 | } |
| 4733 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4734 | static noinline int replace_extents_in_leaf(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4735 | struct btrfs_root *root, |
| 4736 | struct extent_buffer *leaf, |
| 4737 | struct btrfs_block_group_cache *group, |
| 4738 | struct inode *reloc_inode) |
| 4739 | { |
| 4740 | struct btrfs_key key; |
| 4741 | struct btrfs_key extent_key; |
| 4742 | struct btrfs_file_extent_item *fi; |
| 4743 | struct btrfs_leaf_ref *ref; |
| 4744 | struct disk_extent *new_extent; |
| 4745 | u64 bytenr; |
| 4746 | u64 num_bytes; |
| 4747 | u32 nritems; |
| 4748 | u32 i; |
| 4749 | int ext_index; |
| 4750 | int nr_extent; |
| 4751 | int ret; |
| 4752 | |
| 4753 | new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS); |
| 4754 | BUG_ON(!new_extent); |
| 4755 | |
| 4756 | ref = btrfs_lookup_leaf_ref(root, leaf->start); |
| 4757 | BUG_ON(!ref); |
| 4758 | |
| 4759 | ext_index = -1; |
| 4760 | nritems = btrfs_header_nritems(leaf); |
| 4761 | for (i = 0; i < nritems; i++) { |
| 4762 | btrfs_item_key_to_cpu(leaf, &key, i); |
| 4763 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
| 4764 | continue; |
| 4765 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); |
| 4766 | if (btrfs_file_extent_type(leaf, fi) == |
| 4767 | BTRFS_FILE_EXTENT_INLINE) |
| 4768 | continue; |
| 4769 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 4770 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
| 4771 | if (bytenr == 0) |
| 4772 | continue; |
| 4773 | |
| 4774 | ext_index++; |
| 4775 | if (bytenr >= group->key.objectid + group->key.offset || |
| 4776 | bytenr + num_bytes <= group->key.objectid) |
| 4777 | continue; |
| 4778 | |
| 4779 | extent_key.objectid = bytenr; |
| 4780 | extent_key.offset = num_bytes; |
| 4781 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; |
| 4782 | nr_extent = 1; |
| 4783 | ret = get_new_locations(reloc_inode, &extent_key, |
| 4784 | group->key.objectid, 1, |
| 4785 | &new_extent, &nr_extent); |
| 4786 | if (ret > 0) |
| 4787 | continue; |
| 4788 | BUG_ON(ret < 0); |
| 4789 | |
| 4790 | BUG_ON(ref->extents[ext_index].bytenr != bytenr); |
| 4791 | BUG_ON(ref->extents[ext_index].num_bytes != num_bytes); |
| 4792 | ref->extents[ext_index].bytenr = new_extent->disk_bytenr; |
| 4793 | ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes; |
| 4794 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4795 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
| 4796 | new_extent->disk_bytenr); |
| 4797 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, |
| 4798 | new_extent->disk_num_bytes); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4799 | btrfs_mark_buffer_dirty(leaf); |
| 4800 | |
| 4801 | ret = btrfs_inc_extent_ref(trans, root, |
| 4802 | new_extent->disk_bytenr, |
| 4803 | new_extent->disk_num_bytes, |
| 4804 | leaf->start, |
| 4805 | root->root_key.objectid, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4806 | trans->transid, key.objectid); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4807 | BUG_ON(ret); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 4808 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4809 | ret = btrfs_free_extent(trans, root, |
| 4810 | bytenr, num_bytes, leaf->start, |
| 4811 | btrfs_header_owner(leaf), |
| 4812 | btrfs_header_generation(leaf), |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4813 | key.objectid, 0); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4814 | BUG_ON(ret); |
| 4815 | cond_resched(); |
| 4816 | } |
| 4817 | kfree(new_extent); |
| 4818 | BUG_ON(ext_index + 1 != ref->nritems); |
| 4819 | btrfs_free_leaf_ref(root, ref); |
| 4820 | return 0; |
| 4821 | } |
| 4822 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4823 | int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, |
| 4824 | struct btrfs_root *root) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4825 | { |
| 4826 | struct btrfs_root *reloc_root; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4827 | int ret; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4828 | |
| 4829 | if (root->reloc_root) { |
| 4830 | reloc_root = root->reloc_root; |
| 4831 | root->reloc_root = NULL; |
| 4832 | list_add(&reloc_root->dead_list, |
| 4833 | &root->fs_info->dead_reloc_roots); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4834 | |
| 4835 | btrfs_set_root_bytenr(&reloc_root->root_item, |
| 4836 | reloc_root->node->start); |
| 4837 | btrfs_set_root_level(&root->root_item, |
| 4838 | btrfs_header_level(reloc_root->node)); |
| 4839 | memset(&reloc_root->root_item.drop_progress, 0, |
| 4840 | sizeof(struct btrfs_disk_key)); |
| 4841 | reloc_root->root_item.drop_level = 0; |
| 4842 | |
| 4843 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
| 4844 | &reloc_root->root_key, |
| 4845 | &reloc_root->root_item); |
| 4846 | BUG_ON(ret); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4847 | } |
| 4848 | return 0; |
| 4849 | } |
| 4850 | |
| 4851 | int btrfs_drop_dead_reloc_roots(struct btrfs_root *root) |
| 4852 | { |
| 4853 | struct btrfs_trans_handle *trans; |
| 4854 | struct btrfs_root *reloc_root; |
| 4855 | struct btrfs_root *prev_root = NULL; |
| 4856 | struct list_head dead_roots; |
| 4857 | int ret; |
| 4858 | unsigned long nr; |
| 4859 | |
| 4860 | INIT_LIST_HEAD(&dead_roots); |
| 4861 | list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots); |
| 4862 | |
| 4863 | while (!list_empty(&dead_roots)) { |
| 4864 | reloc_root = list_entry(dead_roots.prev, |
| 4865 | struct btrfs_root, dead_list); |
| 4866 | list_del_init(&reloc_root->dead_list); |
| 4867 | |
| 4868 | BUG_ON(reloc_root->commit_root != NULL); |
| 4869 | while (1) { |
| 4870 | trans = btrfs_join_transaction(root, 1); |
| 4871 | BUG_ON(!trans); |
| 4872 | |
| 4873 | mutex_lock(&root->fs_info->drop_mutex); |
| 4874 | ret = btrfs_drop_snapshot(trans, reloc_root); |
| 4875 | if (ret != -EAGAIN) |
| 4876 | break; |
| 4877 | mutex_unlock(&root->fs_info->drop_mutex); |
| 4878 | |
| 4879 | nr = trans->blocks_used; |
| 4880 | ret = btrfs_end_transaction(trans, root); |
| 4881 | BUG_ON(ret); |
| 4882 | btrfs_btree_balance_dirty(root, nr); |
| 4883 | } |
| 4884 | |
| 4885 | free_extent_buffer(reloc_root->node); |
| 4886 | |
| 4887 | ret = btrfs_del_root(trans, root->fs_info->tree_root, |
| 4888 | &reloc_root->root_key); |
| 4889 | BUG_ON(ret); |
| 4890 | mutex_unlock(&root->fs_info->drop_mutex); |
| 4891 | |
| 4892 | nr = trans->blocks_used; |
| 4893 | ret = btrfs_end_transaction(trans, root); |
| 4894 | BUG_ON(ret); |
| 4895 | btrfs_btree_balance_dirty(root, nr); |
| 4896 | |
| 4897 | kfree(prev_root); |
| 4898 | prev_root = reloc_root; |
| 4899 | } |
| 4900 | if (prev_root) { |
| 4901 | btrfs_remove_leaf_refs(prev_root, (u64)-1, 0); |
| 4902 | kfree(prev_root); |
| 4903 | } |
| 4904 | return 0; |
| 4905 | } |
| 4906 | |
| 4907 | int btrfs_add_dead_reloc_root(struct btrfs_root *root) |
| 4908 | { |
| 4909 | list_add(&root->dead_list, &root->fs_info->dead_reloc_roots); |
| 4910 | return 0; |
| 4911 | } |
| 4912 | |
| 4913 | int btrfs_cleanup_reloc_trees(struct btrfs_root *root) |
| 4914 | { |
| 4915 | struct btrfs_root *reloc_root; |
| 4916 | struct btrfs_trans_handle *trans; |
| 4917 | struct btrfs_key location; |
| 4918 | int found; |
| 4919 | int ret; |
| 4920 | |
| 4921 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
| 4922 | ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL); |
| 4923 | BUG_ON(ret); |
| 4924 | found = !list_empty(&root->fs_info->dead_reloc_roots); |
| 4925 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
| 4926 | |
| 4927 | if (found) { |
| 4928 | trans = btrfs_start_transaction(root, 1); |
| 4929 | BUG_ON(!trans); |
| 4930 | ret = btrfs_commit_transaction(trans, root); |
| 4931 | BUG_ON(ret); |
| 4932 | } |
| 4933 | |
| 4934 | location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; |
| 4935 | location.offset = (u64)-1; |
| 4936 | location.type = BTRFS_ROOT_ITEM_KEY; |
| 4937 | |
| 4938 | reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location); |
| 4939 | BUG_ON(!reloc_root); |
| 4940 | btrfs_orphan_cleanup(reloc_root); |
| 4941 | return 0; |
| 4942 | } |
| 4943 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4944 | static noinline int init_reloc_tree(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4945 | struct btrfs_root *root) |
| 4946 | { |
| 4947 | struct btrfs_root *reloc_root; |
| 4948 | struct extent_buffer *eb; |
| 4949 | struct btrfs_root_item *root_item; |
| 4950 | struct btrfs_key root_key; |
| 4951 | int ret; |
| 4952 | |
| 4953 | BUG_ON(!root->ref_cows); |
| 4954 | if (root->reloc_root) |
| 4955 | return 0; |
| 4956 | |
| 4957 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); |
| 4958 | BUG_ON(!root_item); |
| 4959 | |
| 4960 | ret = btrfs_copy_root(trans, root, root->commit_root, |
| 4961 | &eb, BTRFS_TREE_RELOC_OBJECTID); |
| 4962 | BUG_ON(ret); |
| 4963 | |
| 4964 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; |
| 4965 | root_key.offset = root->root_key.objectid; |
| 4966 | root_key.type = BTRFS_ROOT_ITEM_KEY; |
| 4967 | |
| 4968 | memcpy(root_item, &root->root_item, sizeof(root_item)); |
| 4969 | btrfs_set_root_refs(root_item, 0); |
| 4970 | btrfs_set_root_bytenr(root_item, eb->start); |
| 4971 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4972 | btrfs_set_root_generation(root_item, trans->transid); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4973 | |
| 4974 | btrfs_tree_unlock(eb); |
| 4975 | free_extent_buffer(eb); |
| 4976 | |
| 4977 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, |
| 4978 | &root_key, root_item); |
| 4979 | BUG_ON(ret); |
| 4980 | kfree(root_item); |
| 4981 | |
| 4982 | reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, |
| 4983 | &root_key); |
| 4984 | BUG_ON(!reloc_root); |
| 4985 | reloc_root->last_trans = trans->transid; |
| 4986 | reloc_root->commit_root = NULL; |
| 4987 | reloc_root->ref_tree = &root->fs_info->reloc_ref_tree; |
| 4988 | |
| 4989 | root->reloc_root = reloc_root; |
| 4990 | return 0; |
| 4991 | } |
| 4992 | |
| 4993 | /* |
| 4994 | * Core function of space balance. |
| 4995 | * |
| 4996 | * The idea is using reloc trees to relocate tree blocks in reference |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4997 | * counted roots. There is one reloc tree for each subvol, and all |
| 4998 | * reloc trees share same root key objectid. Reloc trees are snapshots |
| 4999 | * of the latest committed roots of subvols (root->commit_root). |
| 5000 | * |
| 5001 | * To relocate a tree block referenced by a subvol, there are two steps. |
| 5002 | * COW the block through subvol's reloc tree, then update block pointer |
| 5003 | * in the subvol to point to the new block. Since all reloc trees share |
| 5004 | * same root key objectid, doing special handing for tree blocks owned |
| 5005 | * by them is easy. Once a tree block has been COWed in one reloc tree, |
| 5006 | * we can use the resulting new block directly when the same block is |
| 5007 | * required to COW again through other reloc trees. By this way, relocated |
| 5008 | * tree blocks are shared between reloc trees, so they are also shared |
| 5009 | * between subvols. |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5010 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5011 | static noinline int relocate_one_path(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5012 | struct btrfs_root *root, |
| 5013 | struct btrfs_path *path, |
| 5014 | struct btrfs_key *first_key, |
| 5015 | struct btrfs_ref_path *ref_path, |
| 5016 | struct btrfs_block_group_cache *group, |
| 5017 | struct inode *reloc_inode) |
| 5018 | { |
| 5019 | struct btrfs_root *reloc_root; |
| 5020 | struct extent_buffer *eb = NULL; |
| 5021 | struct btrfs_key *keys; |
| 5022 | u64 *nodes; |
| 5023 | int level; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5024 | int shared_level; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5025 | int lowest_level = 0; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5026 | int ret; |
| 5027 | |
| 5028 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) |
| 5029 | lowest_level = ref_path->owner_objectid; |
| 5030 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5031 | if (!root->ref_cows) { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5032 | path->lowest_level = lowest_level; |
| 5033 | ret = btrfs_search_slot(trans, root, first_key, path, 0, 1); |
| 5034 | BUG_ON(ret < 0); |
| 5035 | path->lowest_level = 0; |
| 5036 | btrfs_release_path(root, path); |
| 5037 | return 0; |
| 5038 | } |
| 5039 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5040 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
| 5041 | ret = init_reloc_tree(trans, root); |
| 5042 | BUG_ON(ret); |
| 5043 | reloc_root = root->reloc_root; |
| 5044 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5045 | shared_level = ref_path->shared_level; |
| 5046 | ref_path->shared_level = BTRFS_MAX_LEVEL - 1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5047 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5048 | keys = ref_path->node_keys; |
| 5049 | nodes = ref_path->new_nodes; |
| 5050 | memset(&keys[shared_level + 1], 0, |
| 5051 | sizeof(*keys) * (BTRFS_MAX_LEVEL - shared_level - 1)); |
| 5052 | memset(&nodes[shared_level + 1], 0, |
| 5053 | sizeof(*nodes) * (BTRFS_MAX_LEVEL - shared_level - 1)); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5054 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5055 | if (nodes[lowest_level] == 0) { |
| 5056 | path->lowest_level = lowest_level; |
| 5057 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
| 5058 | 0, 1); |
| 5059 | BUG_ON(ret); |
| 5060 | for (level = lowest_level; level < BTRFS_MAX_LEVEL; level++) { |
| 5061 | eb = path->nodes[level]; |
| 5062 | if (!eb || eb == reloc_root->node) |
| 5063 | break; |
| 5064 | nodes[level] = eb->start; |
| 5065 | if (level == 0) |
| 5066 | btrfs_item_key_to_cpu(eb, &keys[level], 0); |
| 5067 | else |
| 5068 | btrfs_node_key_to_cpu(eb, &keys[level], 0); |
| 5069 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 5070 | if (nodes[0] && |
| 5071 | ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5072 | eb = path->nodes[0]; |
| 5073 | ret = replace_extents_in_leaf(trans, reloc_root, eb, |
| 5074 | group, reloc_inode); |
| 5075 | BUG_ON(ret); |
| 5076 | } |
| 5077 | btrfs_release_path(reloc_root, path); |
| 5078 | } else { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5079 | ret = btrfs_merge_path(trans, reloc_root, keys, nodes, |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5080 | lowest_level); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5081 | BUG_ON(ret); |
| 5082 | } |
| 5083 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5084 | /* |
| 5085 | * replace tree blocks in the fs tree with tree blocks in |
| 5086 | * the reloc tree. |
| 5087 | */ |
| 5088 | ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level); |
| 5089 | BUG_ON(ret < 0); |
| 5090 | |
| 5091 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5092 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
| 5093 | 0, 0); |
| 5094 | BUG_ON(ret); |
| 5095 | extent_buffer_get(path->nodes[0]); |
| 5096 | eb = path->nodes[0]; |
| 5097 | btrfs_release_path(reloc_root, path); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5098 | ret = invalidate_extent_cache(reloc_root, eb, group, root); |
| 5099 | BUG_ON(ret); |
| 5100 | free_extent_buffer(eb); |
| 5101 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5102 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5103 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5104 | path->lowest_level = 0; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5105 | return 0; |
| 5106 | } |
| 5107 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5108 | static noinline int relocate_tree_block(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5109 | struct btrfs_root *root, |
| 5110 | struct btrfs_path *path, |
| 5111 | struct btrfs_key *first_key, |
| 5112 | struct btrfs_ref_path *ref_path) |
| 5113 | { |
| 5114 | int ret; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5115 | |
| 5116 | ret = relocate_one_path(trans, root, path, first_key, |
| 5117 | ref_path, NULL, NULL); |
| 5118 | BUG_ON(ret); |
| 5119 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5120 | return 0; |
| 5121 | } |
| 5122 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5123 | static noinline int del_extent_zero(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5124 | struct btrfs_root *extent_root, |
| 5125 | struct btrfs_path *path, |
| 5126 | struct btrfs_key *extent_key) |
| 5127 | { |
| 5128 | int ret; |
| 5129 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5130 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); |
| 5131 | if (ret) |
| 5132 | goto out; |
| 5133 | ret = btrfs_del_item(trans, extent_root, path); |
| 5134 | out: |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5135 | btrfs_release_path(extent_root, path); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5136 | return ret; |
| 5137 | } |
| 5138 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5139 | static noinline struct btrfs_root *read_ref_root(struct btrfs_fs_info *fs_info, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5140 | struct btrfs_ref_path *ref_path) |
| 5141 | { |
| 5142 | struct btrfs_key root_key; |
| 5143 | |
| 5144 | root_key.objectid = ref_path->root_objectid; |
| 5145 | root_key.type = BTRFS_ROOT_ITEM_KEY; |
| 5146 | if (is_cowonly_root(ref_path->root_objectid)) |
| 5147 | root_key.offset = 0; |
| 5148 | else |
| 5149 | root_key.offset = (u64)-1; |
| 5150 | |
| 5151 | return btrfs_read_fs_root_no_name(fs_info, &root_key); |
| 5152 | } |
| 5153 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5154 | static noinline int relocate_one_extent(struct btrfs_root *extent_root, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5155 | struct btrfs_path *path, |
| 5156 | struct btrfs_key *extent_key, |
| 5157 | struct btrfs_block_group_cache *group, |
| 5158 | struct inode *reloc_inode, int pass) |
| 5159 | { |
| 5160 | struct btrfs_trans_handle *trans; |
| 5161 | struct btrfs_root *found_root; |
| 5162 | struct btrfs_ref_path *ref_path = NULL; |
| 5163 | struct disk_extent *new_extents = NULL; |
| 5164 | int nr_extents = 0; |
| 5165 | int loops; |
| 5166 | int ret; |
| 5167 | int level; |
| 5168 | struct btrfs_key first_key; |
| 5169 | u64 prev_block = 0; |
| 5170 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5171 | |
| 5172 | trans = btrfs_start_transaction(extent_root, 1); |
| 5173 | BUG_ON(!trans); |
| 5174 | |
| 5175 | if (extent_key->objectid == 0) { |
| 5176 | ret = del_extent_zero(trans, extent_root, path, extent_key); |
| 5177 | goto out; |
| 5178 | } |
| 5179 | |
| 5180 | ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS); |
| 5181 | if (!ref_path) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5182 | ret = -ENOMEM; |
| 5183 | goto out; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5184 | } |
| 5185 | |
| 5186 | for (loops = 0; ; loops++) { |
| 5187 | if (loops == 0) { |
| 5188 | ret = btrfs_first_ref_path(trans, extent_root, ref_path, |
| 5189 | extent_key->objectid); |
| 5190 | } else { |
| 5191 | ret = btrfs_next_ref_path(trans, extent_root, ref_path); |
| 5192 | } |
| 5193 | if (ret < 0) |
| 5194 | goto out; |
| 5195 | if (ret > 0) |
| 5196 | break; |
| 5197 | |
| 5198 | if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID || |
| 5199 | ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID) |
| 5200 | continue; |
| 5201 | |
| 5202 | found_root = read_ref_root(extent_root->fs_info, ref_path); |
| 5203 | BUG_ON(!found_root); |
| 5204 | /* |
| 5205 | * for reference counted tree, only process reference paths |
| 5206 | * rooted at the latest committed root. |
| 5207 | */ |
| 5208 | if (found_root->ref_cows && |
| 5209 | ref_path->root_generation != found_root->root_key.offset) |
| 5210 | continue; |
| 5211 | |
| 5212 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
| 5213 | if (pass == 0) { |
| 5214 | /* |
| 5215 | * copy data extents to new locations |
| 5216 | */ |
| 5217 | u64 group_start = group->key.objectid; |
| 5218 | ret = relocate_data_extent(reloc_inode, |
| 5219 | extent_key, |
| 5220 | group_start); |
| 5221 | if (ret < 0) |
| 5222 | goto out; |
| 5223 | break; |
| 5224 | } |
| 5225 | level = 0; |
| 5226 | } else { |
| 5227 | level = ref_path->owner_objectid; |
| 5228 | } |
| 5229 | |
| 5230 | if (prev_block != ref_path->nodes[level]) { |
| 5231 | struct extent_buffer *eb; |
| 5232 | u64 block_start = ref_path->nodes[level]; |
| 5233 | u64 block_size = btrfs_level_size(found_root, level); |
| 5234 | |
| 5235 | eb = read_tree_block(found_root, block_start, |
| 5236 | block_size, 0); |
| 5237 | btrfs_tree_lock(eb); |
| 5238 | BUG_ON(level != btrfs_header_level(eb)); |
| 5239 | |
| 5240 | if (level == 0) |
| 5241 | btrfs_item_key_to_cpu(eb, &first_key, 0); |
| 5242 | else |
| 5243 | btrfs_node_key_to_cpu(eb, &first_key, 0); |
| 5244 | |
| 5245 | btrfs_tree_unlock(eb); |
| 5246 | free_extent_buffer(eb); |
| 5247 | prev_block = block_start; |
| 5248 | } |
| 5249 | |
Yan Zheng | 2456242 | 2009-02-12 14:14:53 -0500 | [diff] [blame] | 5250 | mutex_lock(&extent_root->fs_info->trans_mutex); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 5251 | btrfs_record_root_in_trans(found_root); |
Yan Zheng | 2456242 | 2009-02-12 14:14:53 -0500 | [diff] [blame] | 5252 | mutex_unlock(&extent_root->fs_info->trans_mutex); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 5253 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
| 5254 | /* |
| 5255 | * try to update data extent references while |
| 5256 | * keeping metadata shared between snapshots. |
| 5257 | */ |
| 5258 | if (pass == 1) { |
| 5259 | ret = relocate_one_path(trans, found_root, |
| 5260 | path, &first_key, ref_path, |
| 5261 | group, reloc_inode); |
| 5262 | if (ret < 0) |
| 5263 | goto out; |
| 5264 | continue; |
| 5265 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5266 | /* |
| 5267 | * use fallback method to process the remaining |
| 5268 | * references. |
| 5269 | */ |
| 5270 | if (!new_extents) { |
| 5271 | u64 group_start = group->key.objectid; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5272 | new_extents = kmalloc(sizeof(*new_extents), |
| 5273 | GFP_NOFS); |
| 5274 | nr_extents = 1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5275 | ret = get_new_locations(reloc_inode, |
| 5276 | extent_key, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5277 | group_start, 1, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5278 | &new_extents, |
| 5279 | &nr_extents); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5280 | if (ret) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5281 | goto out; |
| 5282 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5283 | ret = replace_one_extent(trans, found_root, |
| 5284 | path, extent_key, |
| 5285 | &first_key, ref_path, |
| 5286 | new_extents, nr_extents); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 5287 | } else { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5288 | ret = relocate_tree_block(trans, found_root, path, |
| 5289 | &first_key, ref_path); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5290 | } |
| 5291 | if (ret < 0) |
| 5292 | goto out; |
| 5293 | } |
| 5294 | ret = 0; |
| 5295 | out: |
| 5296 | btrfs_end_transaction(trans, extent_root); |
| 5297 | kfree(new_extents); |
| 5298 | kfree(ref_path); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5299 | return ret; |
| 5300 | } |
| 5301 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 5302 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
| 5303 | { |
| 5304 | u64 num_devices; |
| 5305 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | |
| 5306 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
| 5307 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 5308 | num_devices = root->fs_info->fs_devices->rw_devices; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 5309 | if (num_devices == 1) { |
| 5310 | stripped |= BTRFS_BLOCK_GROUP_DUP; |
| 5311 | stripped = flags & ~stripped; |
| 5312 | |
| 5313 | /* turn raid0 into single device chunks */ |
| 5314 | if (flags & BTRFS_BLOCK_GROUP_RAID0) |
| 5315 | return stripped; |
| 5316 | |
| 5317 | /* turn mirroring into duplication */ |
| 5318 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | |
| 5319 | BTRFS_BLOCK_GROUP_RAID10)) |
| 5320 | return stripped | BTRFS_BLOCK_GROUP_DUP; |
| 5321 | return flags; |
| 5322 | } else { |
| 5323 | /* they already had raid on here, just return */ |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 5324 | if (flags & stripped) |
| 5325 | return flags; |
| 5326 | |
| 5327 | stripped |= BTRFS_BLOCK_GROUP_DUP; |
| 5328 | stripped = flags & ~stripped; |
| 5329 | |
| 5330 | /* switch duplicated blocks with raid1 */ |
| 5331 | if (flags & BTRFS_BLOCK_GROUP_DUP) |
| 5332 | return stripped | BTRFS_BLOCK_GROUP_RAID1; |
| 5333 | |
| 5334 | /* turn single device chunks into raid0 */ |
| 5335 | return stripped | BTRFS_BLOCK_GROUP_RAID0; |
| 5336 | } |
| 5337 | return flags; |
| 5338 | } |
| 5339 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 5340 | static int __alloc_chunk_for_shrink(struct btrfs_root *root, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5341 | struct btrfs_block_group_cache *shrink_block_group, |
| 5342 | int force) |
| 5343 | { |
| 5344 | struct btrfs_trans_handle *trans; |
| 5345 | u64 new_alloc_flags; |
| 5346 | u64 calc; |
| 5347 | |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5348 | spin_lock(&shrink_block_group->lock); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5349 | if (btrfs_block_group_used(&shrink_block_group->item) > 0) { |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5350 | spin_unlock(&shrink_block_group->lock); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5351 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5352 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5353 | spin_lock(&shrink_block_group->lock); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 5354 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5355 | new_alloc_flags = update_block_group_flags(root, |
| 5356 | shrink_block_group->flags); |
| 5357 | if (new_alloc_flags != shrink_block_group->flags) { |
| 5358 | calc = |
| 5359 | btrfs_block_group_used(&shrink_block_group->item); |
| 5360 | } else { |
| 5361 | calc = shrink_block_group->key.offset; |
| 5362 | } |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5363 | spin_unlock(&shrink_block_group->lock); |
| 5364 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5365 | do_chunk_alloc(trans, root->fs_info->extent_root, |
| 5366 | calc + 2 * 1024 * 1024, new_alloc_flags, force); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 5367 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5368 | btrfs_end_transaction(trans, root); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5369 | } else |
| 5370 | spin_unlock(&shrink_block_group->lock); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5371 | return 0; |
| 5372 | } |
| 5373 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5374 | static int __insert_orphan_inode(struct btrfs_trans_handle *trans, |
| 5375 | struct btrfs_root *root, |
| 5376 | u64 objectid, u64 size) |
| 5377 | { |
| 5378 | struct btrfs_path *path; |
| 5379 | struct btrfs_inode_item *item; |
| 5380 | struct extent_buffer *leaf; |
| 5381 | int ret; |
| 5382 | |
| 5383 | path = btrfs_alloc_path(); |
| 5384 | if (!path) |
| 5385 | return -ENOMEM; |
| 5386 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 5387 | path->leave_spinning = 1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5388 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
| 5389 | if (ret) |
| 5390 | goto out; |
| 5391 | |
| 5392 | leaf = path->nodes[0]; |
| 5393 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); |
| 5394 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); |
| 5395 | btrfs_set_inode_generation(leaf, item, 1); |
| 5396 | btrfs_set_inode_size(leaf, item, size); |
| 5397 | btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); |
Yan Zheng | 0403e47 | 2008-12-10 20:32:51 -0500 | [diff] [blame] | 5398 | btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5399 | btrfs_mark_buffer_dirty(leaf); |
| 5400 | btrfs_release_path(root, path); |
| 5401 | out: |
| 5402 | btrfs_free_path(path); |
| 5403 | return ret; |
| 5404 | } |
| 5405 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5406 | static noinline struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5407 | struct btrfs_block_group_cache *group) |
| 5408 | { |
| 5409 | struct inode *inode = NULL; |
| 5410 | struct btrfs_trans_handle *trans; |
| 5411 | struct btrfs_root *root; |
| 5412 | struct btrfs_key root_key; |
| 5413 | u64 objectid = BTRFS_FIRST_FREE_OBJECTID; |
| 5414 | int err = 0; |
| 5415 | |
| 5416 | root_key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; |
| 5417 | root_key.type = BTRFS_ROOT_ITEM_KEY; |
| 5418 | root_key.offset = (u64)-1; |
| 5419 | root = btrfs_read_fs_root_no_name(fs_info, &root_key); |
| 5420 | if (IS_ERR(root)) |
| 5421 | return ERR_CAST(root); |
| 5422 | |
| 5423 | trans = btrfs_start_transaction(root, 1); |
| 5424 | BUG_ON(!trans); |
| 5425 | |
| 5426 | err = btrfs_find_free_objectid(trans, root, objectid, &objectid); |
| 5427 | if (err) |
| 5428 | goto out; |
| 5429 | |
| 5430 | err = __insert_orphan_inode(trans, root, objectid, group->key.offset); |
| 5431 | BUG_ON(err); |
| 5432 | |
| 5433 | err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5434 | group->key.offset, 0, group->key.offset, |
| 5435 | 0, 0, 0); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5436 | BUG_ON(err); |
| 5437 | |
| 5438 | inode = btrfs_iget_locked(root->fs_info->sb, objectid, root); |
| 5439 | if (inode->i_state & I_NEW) { |
| 5440 | BTRFS_I(inode)->root = root; |
| 5441 | BTRFS_I(inode)->location.objectid = objectid; |
| 5442 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; |
| 5443 | BTRFS_I(inode)->location.offset = 0; |
| 5444 | btrfs_read_locked_inode(inode); |
| 5445 | unlock_new_inode(inode); |
| 5446 | BUG_ON(is_bad_inode(inode)); |
| 5447 | } else { |
| 5448 | BUG_ON(1); |
| 5449 | } |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 5450 | BTRFS_I(inode)->index_cnt = group->key.objectid; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5451 | |
| 5452 | err = btrfs_orphan_add(trans, inode); |
| 5453 | out: |
| 5454 | btrfs_end_transaction(trans, root); |
| 5455 | if (err) { |
| 5456 | if (inode) |
| 5457 | iput(inode); |
| 5458 | inode = ERR_PTR(err); |
| 5459 | } |
| 5460 | return inode; |
| 5461 | } |
| 5462 | |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 5463 | int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len) |
| 5464 | { |
| 5465 | |
| 5466 | struct btrfs_ordered_sum *sums; |
| 5467 | struct btrfs_sector_sum *sector_sum; |
| 5468 | struct btrfs_ordered_extent *ordered; |
| 5469 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5470 | struct list_head list; |
| 5471 | size_t offset; |
| 5472 | int ret; |
| 5473 | u64 disk_bytenr; |
| 5474 | |
| 5475 | INIT_LIST_HEAD(&list); |
| 5476 | |
| 5477 | ordered = btrfs_lookup_ordered_extent(inode, file_pos); |
| 5478 | BUG_ON(ordered->file_offset != file_pos || ordered->len != len); |
| 5479 | |
| 5480 | disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt; |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 5481 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr, |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 5482 | disk_bytenr + len - 1, &list); |
| 5483 | |
| 5484 | while (!list_empty(&list)) { |
| 5485 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); |
| 5486 | list_del_init(&sums->list); |
| 5487 | |
| 5488 | sector_sum = sums->sums; |
| 5489 | sums->bytenr = ordered->start; |
| 5490 | |
| 5491 | offset = 0; |
| 5492 | while (offset < sums->len) { |
| 5493 | sector_sum->bytenr += ordered->start - disk_bytenr; |
| 5494 | sector_sum++; |
| 5495 | offset += root->sectorsize; |
| 5496 | } |
| 5497 | |
| 5498 | btrfs_add_ordered_sum(inode, ordered, sums); |
| 5499 | } |
| 5500 | btrfs_put_ordered_extent(ordered); |
| 5501 | return 0; |
| 5502 | } |
| 5503 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5504 | int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start) |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5505 | { |
| 5506 | struct btrfs_trans_handle *trans; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5507 | struct btrfs_path *path; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5508 | struct btrfs_fs_info *info = root->fs_info; |
| 5509 | struct extent_buffer *leaf; |
| 5510 | struct inode *reloc_inode; |
| 5511 | struct btrfs_block_group_cache *block_group; |
| 5512 | struct btrfs_key key; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5513 | u64 skipped; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5514 | u64 cur_byte; |
| 5515 | u64 total_found; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5516 | u32 nritems; |
| 5517 | int ret; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5518 | int progress; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5519 | int pass = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5520 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5521 | root = root->fs_info->extent_root; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5522 | |
| 5523 | block_group = btrfs_lookup_block_group(info, group_start); |
| 5524 | BUG_ON(!block_group); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5525 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5526 | printk(KERN_INFO "btrfs relocating block group %llu flags %llu\n", |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5527 | (unsigned long long)block_group->key.objectid, |
| 5528 | (unsigned long long)block_group->flags); |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 5529 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5530 | path = btrfs_alloc_path(); |
| 5531 | BUG_ON(!path); |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 5532 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5533 | reloc_inode = create_reloc_inode(info, block_group); |
| 5534 | BUG_ON(IS_ERR(reloc_inode)); |
| 5535 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5536 | __alloc_chunk_for_shrink(root, block_group, 1); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 5537 | set_block_group_readonly(block_group); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5538 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5539 | btrfs_start_delalloc_inodes(info->tree_root); |
| 5540 | btrfs_wait_ordered_extents(info->tree_root, 0); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5541 | again: |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5542 | skipped = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5543 | total_found = 0; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5544 | progress = 0; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5545 | key.objectid = block_group->key.objectid; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5546 | key.offset = 0; |
| 5547 | key.type = 0; |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 5548 | cur_byte = key.objectid; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 5549 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5550 | trans = btrfs_start_transaction(info->tree_root, 1); |
| 5551 | btrfs_commit_transaction(trans, info->tree_root); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 5552 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5553 | mutex_lock(&root->fs_info->cleaner_mutex); |
| 5554 | btrfs_clean_old_snapshots(info->tree_root); |
| 5555 | btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1); |
| 5556 | mutex_unlock(&root->fs_info->cleaner_mutex); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 5557 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 5558 | trans = btrfs_start_transaction(info->tree_root, 1); |
| 5559 | btrfs_commit_transaction(trans, info->tree_root); |
| 5560 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5561 | while (1) { |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5562 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 5563 | if (ret < 0) |
| 5564 | goto out; |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 5565 | next: |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5566 | leaf = path->nodes[0]; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5567 | nritems = btrfs_header_nritems(leaf); |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 5568 | if (path->slots[0] >= nritems) { |
| 5569 | ret = btrfs_next_leaf(root, path); |
| 5570 | if (ret < 0) |
| 5571 | goto out; |
| 5572 | if (ret == 1) { |
| 5573 | ret = 0; |
| 5574 | break; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5575 | } |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 5576 | leaf = path->nodes[0]; |
| 5577 | nritems = btrfs_header_nritems(leaf); |
| 5578 | } |
| 5579 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5580 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 5581 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5582 | if (key.objectid >= block_group->key.objectid + |
| 5583 | block_group->key.offset) |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 5584 | break; |
| 5585 | |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 5586 | if (progress && need_resched()) { |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 5587 | btrfs_release_path(root, path); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5588 | cond_resched(); |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 5589 | progress = 0; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5590 | continue; |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 5591 | } |
| 5592 | progress = 1; |
| 5593 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5594 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY || |
| 5595 | key.objectid + key.offset <= cur_byte) { |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 5596 | path->slots[0]++; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5597 | goto next; |
| 5598 | } |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 5599 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5600 | total_found++; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5601 | cur_byte = key.objectid + key.offset; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5602 | btrfs_release_path(root, path); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5603 | |
| 5604 | __alloc_chunk_for_shrink(root, block_group, 0); |
| 5605 | ret = relocate_one_extent(root, path, &key, block_group, |
| 5606 | reloc_inode, pass); |
| 5607 | BUG_ON(ret < 0); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5608 | if (ret > 0) |
| 5609 | skipped++; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5610 | |
| 5611 | key.objectid = cur_byte; |
| 5612 | key.type = 0; |
| 5613 | key.offset = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5614 | } |
| 5615 | |
| 5616 | btrfs_release_path(root, path); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5617 | |
| 5618 | if (pass == 0) { |
| 5619 | btrfs_wait_ordered_range(reloc_inode, 0, (u64)-1); |
| 5620 | invalidate_mapping_pages(reloc_inode->i_mapping, 0, -1); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5621 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5622 | |
| 5623 | if (total_found > 0) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5624 | printk(KERN_INFO "btrfs found %llu extents in pass %d\n", |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5625 | (unsigned long long)total_found, pass); |
| 5626 | pass++; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5627 | if (total_found == skipped && pass > 2) { |
| 5628 | iput(reloc_inode); |
| 5629 | reloc_inode = create_reloc_inode(info, block_group); |
| 5630 | pass = 0; |
| 5631 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5632 | goto again; |
| 5633 | } |
| 5634 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5635 | /* delete reloc_inode */ |
| 5636 | iput(reloc_inode); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 5637 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5638 | /* unpin extents in this range */ |
| 5639 | trans = btrfs_start_transaction(info->tree_root, 1); |
| 5640 | btrfs_commit_transaction(trans, info->tree_root); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5641 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5642 | spin_lock(&block_group->lock); |
| 5643 | WARN_ON(block_group->pinned > 0); |
| 5644 | WARN_ON(block_group->reserved > 0); |
| 5645 | WARN_ON(btrfs_block_group_used(&block_group->item) > 0); |
| 5646 | spin_unlock(&block_group->lock); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5647 | put_block_group(block_group); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5648 | ret = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5649 | out: |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5650 | btrfs_free_path(path); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5651 | return ret; |
| 5652 | } |
| 5653 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 5654 | static int find_first_block_group(struct btrfs_root *root, |
| 5655 | struct btrfs_path *path, struct btrfs_key *key) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5656 | { |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 5657 | int ret = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5658 | struct btrfs_key found_key; |
| 5659 | struct extent_buffer *leaf; |
| 5660 | int slot; |
| 5661 | |
| 5662 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
| 5663 | if (ret < 0) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 5664 | goto out; |
| 5665 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5666 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5667 | slot = path->slots[0]; |
| 5668 | leaf = path->nodes[0]; |
| 5669 | if (slot >= btrfs_header_nritems(leaf)) { |
| 5670 | ret = btrfs_next_leaf(root, path); |
| 5671 | if (ret == 0) |
| 5672 | continue; |
| 5673 | if (ret < 0) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 5674 | goto out; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5675 | break; |
| 5676 | } |
| 5677 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 5678 | |
| 5679 | if (found_key.objectid >= key->objectid && |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 5680 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
| 5681 | ret = 0; |
| 5682 | goto out; |
| 5683 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5684 | path->slots[0]++; |
| 5685 | } |
| 5686 | ret = -ENOENT; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 5687 | out: |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5688 | return ret; |
| 5689 | } |
| 5690 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5691 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
| 5692 | { |
| 5693 | struct btrfs_block_group_cache *block_group; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 5694 | struct btrfs_space_info *space_info; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5695 | struct rb_node *n; |
| 5696 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5697 | spin_lock(&info->block_group_cache_lock); |
| 5698 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { |
| 5699 | block_group = rb_entry(n, struct btrfs_block_group_cache, |
| 5700 | cache_node); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5701 | rb_erase(&block_group->cache_node, |
| 5702 | &info->block_group_cache_tree); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5703 | spin_unlock(&info->block_group_cache_lock); |
| 5704 | |
| 5705 | btrfs_remove_free_space_cache(block_group); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5706 | down_write(&block_group->space_info->groups_sem); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5707 | list_del(&block_group->list); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5708 | up_write(&block_group->space_info->groups_sem); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5709 | |
| 5710 | WARN_ON(atomic_read(&block_group->count) != 1); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5711 | kfree(block_group); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5712 | |
| 5713 | spin_lock(&info->block_group_cache_lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5714 | } |
| 5715 | spin_unlock(&info->block_group_cache_lock); |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 5716 | |
| 5717 | /* now that all the block groups are freed, go through and |
| 5718 | * free all the space_info structs. This is only called during |
| 5719 | * the final stages of unmount, and so we know nobody is |
| 5720 | * using them. We call synchronize_rcu() once before we start, |
| 5721 | * just to be on the safe side. |
| 5722 | */ |
| 5723 | synchronize_rcu(); |
| 5724 | |
| 5725 | while(!list_empty(&info->space_info)) { |
| 5726 | space_info = list_entry(info->space_info.next, |
| 5727 | struct btrfs_space_info, |
| 5728 | list); |
| 5729 | |
| 5730 | list_del(&space_info->list); |
| 5731 | kfree(space_info); |
| 5732 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5733 | return 0; |
| 5734 | } |
| 5735 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5736 | int btrfs_read_block_groups(struct btrfs_root *root) |
| 5737 | { |
| 5738 | struct btrfs_path *path; |
| 5739 | int ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5740 | struct btrfs_block_group_cache *cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 5741 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5742 | struct btrfs_space_info *space_info; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5743 | struct btrfs_key key; |
| 5744 | struct btrfs_key found_key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5745 | struct extent_buffer *leaf; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 5746 | |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 5747 | root = info->extent_root; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5748 | key.objectid = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5749 | key.offset = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5750 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5751 | path = btrfs_alloc_path(); |
| 5752 | if (!path) |
| 5753 | return -ENOMEM; |
| 5754 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5755 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5756 | ret = find_first_block_group(root, path, &key); |
| 5757 | if (ret > 0) { |
| 5758 | ret = 0; |
| 5759 | goto error; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5760 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5761 | if (ret != 0) |
| 5762 | goto error; |
| 5763 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5764 | leaf = path->nodes[0]; |
| 5765 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 5766 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5767 | if (!cache) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5768 | ret = -ENOMEM; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5769 | break; |
| 5770 | } |
Chris Mason | 3e1ad54 | 2007-05-07 20:03:49 -0400 | [diff] [blame] | 5771 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5772 | atomic_set(&cache->count, 1); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5773 | spin_lock_init(&cache->lock); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 5774 | spin_lock_init(&cache->tree_lock); |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 5775 | mutex_init(&cache->cache_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5776 | INIT_LIST_HEAD(&cache->list); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5777 | read_extent_buffer(leaf, &cache->item, |
| 5778 | btrfs_item_ptr_offset(leaf, path->slots[0]), |
| 5779 | sizeof(cache->item)); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5780 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5781 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5782 | key.objectid = found_key.objectid + found_key.offset; |
| 5783 | btrfs_release_path(root, path); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5784 | cache->flags = btrfs_block_group_flags(&cache->item); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 5785 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5786 | ret = update_space_info(info, cache->flags, found_key.offset, |
| 5787 | btrfs_block_group_used(&cache->item), |
| 5788 | &space_info); |
| 5789 | BUG_ON(ret); |
| 5790 | cache->space_info = space_info; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5791 | down_write(&space_info->groups_sem); |
| 5792 | list_add_tail(&cache->list, &space_info->block_groups); |
| 5793 | up_write(&space_info->groups_sem); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5794 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5795 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
| 5796 | BUG_ON(ret); |
Chris Mason | 75ccf47 | 2008-09-30 19:24:06 -0400 | [diff] [blame] | 5797 | |
| 5798 | set_avail_alloc_bits(root->fs_info, cache->flags); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 5799 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
| 5800 | set_block_group_readonly(cache); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5801 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5802 | ret = 0; |
| 5803 | error: |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5804 | btrfs_free_path(path); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 5805 | return ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 5806 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5807 | |
| 5808 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
| 5809 | struct btrfs_root *root, u64 bytes_used, |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 5810 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5811 | u64 size) |
| 5812 | { |
| 5813 | int ret; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5814 | struct btrfs_root *extent_root; |
| 5815 | struct btrfs_block_group_cache *cache; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5816 | |
| 5817 | extent_root = root->fs_info->extent_root; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5818 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5819 | root->fs_info->last_trans_log_full_commit = trans->transid; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5820 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 5821 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5822 | if (!cache) |
| 5823 | return -ENOMEM; |
| 5824 | |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 5825 | cache->key.objectid = chunk_offset; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5826 | cache->key.offset = size; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5827 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
| 5828 | atomic_set(&cache->count, 1); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5829 | spin_lock_init(&cache->lock); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 5830 | spin_lock_init(&cache->tree_lock); |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 5831 | mutex_init(&cache->cache_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5832 | INIT_LIST_HEAD(&cache->list); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5833 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5834 | btrfs_set_block_group_used(&cache->item, bytes_used); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5835 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
| 5836 | cache->flags = type; |
| 5837 | btrfs_set_block_group_flags(&cache->item, type); |
| 5838 | |
| 5839 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
| 5840 | &cache->space_info); |
| 5841 | BUG_ON(ret); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5842 | down_write(&cache->space_info->groups_sem); |
| 5843 | list_add_tail(&cache->list, &cache->space_info->block_groups); |
| 5844 | up_write(&cache->space_info->groups_sem); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5845 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 5846 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
| 5847 | BUG_ON(ret); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5848 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5849 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
| 5850 | sizeof(cache->item)); |
| 5851 | BUG_ON(ret); |
| 5852 | |
Chris Mason | d18a2c4 | 2008-04-04 15:40:00 -0400 | [diff] [blame] | 5853 | set_avail_alloc_bits(extent_root->fs_info, type); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 5854 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 5855 | return 0; |
| 5856 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5857 | |
| 5858 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
| 5859 | struct btrfs_root *root, u64 group_start) |
| 5860 | { |
| 5861 | struct btrfs_path *path; |
| 5862 | struct btrfs_block_group_cache *block_group; |
| 5863 | struct btrfs_key key; |
| 5864 | int ret; |
| 5865 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5866 | root = root->fs_info->extent_root; |
| 5867 | |
| 5868 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); |
| 5869 | BUG_ON(!block_group); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 5870 | BUG_ON(!block_group->ro); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5871 | |
| 5872 | memcpy(&key, &block_group->key, sizeof(key)); |
| 5873 | |
| 5874 | path = btrfs_alloc_path(); |
| 5875 | BUG_ON(!path); |
| 5876 | |
Yan Zheng | 3dfdb93 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 5877 | spin_lock(&root->fs_info->block_group_cache_lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5878 | rb_erase(&block_group->cache_node, |
| 5879 | &root->fs_info->block_group_cache_tree); |
Yan Zheng | 3dfdb93 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 5880 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 5881 | btrfs_remove_free_space_cache(block_group); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5882 | down_write(&block_group->space_info->groups_sem); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5883 | list_del(&block_group->list); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5884 | up_write(&block_group->space_info->groups_sem); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5885 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 5886 | spin_lock(&block_group->space_info->lock); |
| 5887 | block_group->space_info->total_bytes -= block_group->key.offset; |
| 5888 | block_group->space_info->bytes_readonly -= block_group->key.offset; |
| 5889 | spin_unlock(&block_group->space_info->lock); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 5890 | block_group->space_info->full = 0; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 5891 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 5892 | put_block_group(block_group); |
| 5893 | put_block_group(block_group); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5894 | |
| 5895 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 5896 | if (ret > 0) |
| 5897 | ret = -EIO; |
| 5898 | if (ret < 0) |
| 5899 | goto out; |
| 5900 | |
| 5901 | ret = btrfs_del_item(trans, root, path); |
| 5902 | out: |
| 5903 | btrfs_free_path(path); |
| 5904 | return ret; |
| 5905 | } |