NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1 | /* |
| 2 | * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 |
| 3 | * |
| 4 | * bitmap_create - sets up the bitmap structure |
| 5 | * bitmap_destroy - destroys the bitmap structure |
| 6 | * |
| 7 | * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.: |
| 8 | * - added disk storage for bitmap |
| 9 | * - changes to allow various bitmap chunk sizes |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | /* |
| 13 | * Still to do: |
| 14 | * |
| 15 | * flush after percent set rather than just time based. (maybe both). |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 16 | */ |
| 17 | |
NeilBrown | bff6197 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 18 | #include <linux/blkdev.h> |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 19 | #include <linux/module.h> |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 20 | #include <linux/errno.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/init.h> |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 23 | #include <linux/timer.h> |
| 24 | #include <linux/sched.h> |
| 25 | #include <linux/list.h> |
| 26 | #include <linux/file.h> |
| 27 | #include <linux/mount.h> |
| 28 | #include <linux/buffer_head.h> |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 29 | #include <linux/seq_file.h> |
NeilBrown | 43b2e5d | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 30 | #include "md.h" |
Christoph Hellwig | ef740c3 | 2009-03-31 14:27:03 +1100 | [diff] [blame] | 31 | #include "bitmap.h" |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 32 | |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 33 | static inline char *bmname(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 34 | { |
| 35 | return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; |
| 36 | } |
| 37 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 38 | /* |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 39 | * check a page and, if necessary, allocate it (or hijack it if the alloc fails) |
| 40 | * |
| 41 | * 1) check to see if this page is allocated, if it's not then try to alloc |
| 42 | * 2) if the alloc fails, set the page's hijacked flag so we'll use the |
| 43 | * page pointer directly as a counter |
| 44 | * |
| 45 | * if we find our page, we increment the page's refcount so that it stays |
| 46 | * allocated while we're using it |
| 47 | */ |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 48 | static int bitmap_checkpage(struct bitmap *bitmap, |
| 49 | unsigned long page, int create) |
NeilBrown | ee305ac | 2009-09-23 18:06:44 +1000 | [diff] [blame] | 50 | __releases(bitmap->lock) |
| 51 | __acquires(bitmap->lock) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 52 | { |
| 53 | unsigned char *mappage; |
| 54 | |
| 55 | if (page >= bitmap->pages) { |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 56 | /* This can happen if bitmap_start_sync goes beyond |
| 57 | * End-of-device while looking for a whole page. |
| 58 | * It is harmless. |
| 59 | */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 60 | return -EINVAL; |
| 61 | } |
| 62 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 63 | if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ |
| 64 | return 0; |
| 65 | |
| 66 | if (bitmap->bp[page].map) /* page is already allocated, just return */ |
| 67 | return 0; |
| 68 | |
| 69 | if (!create) |
| 70 | return -ENOENT; |
| 71 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 72 | /* this page has not been allocated yet */ |
| 73 | |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 74 | spin_unlock_irq(&bitmap->lock); |
NeilBrown | 792a1d4 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 75 | mappage = kzalloc(PAGE_SIZE, GFP_NOIO); |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 76 | spin_lock_irq(&bitmap->lock); |
| 77 | |
| 78 | if (mappage == NULL) { |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 79 | pr_debug("%s: bitmap map page allocation failed, hijacking\n", |
| 80 | bmname(bitmap)); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 81 | /* failed - set the hijacked flag so that we can use the |
| 82 | * pointer as a counter */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 83 | if (!bitmap->bp[page].map) |
| 84 | bitmap->bp[page].hijacked = 1; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 85 | } else if (bitmap->bp[page].map || |
| 86 | bitmap->bp[page].hijacked) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 87 | /* somebody beat us to getting the page */ |
NeilBrown | 792a1d4 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 88 | kfree(mappage); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 89 | return 0; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 90 | } else { |
| 91 | |
| 92 | /* no page was in place and we have one, so install it */ |
| 93 | |
| 94 | bitmap->bp[page].map = mappage; |
| 95 | bitmap->missing_pages--; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 96 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 97 | return 0; |
| 98 | } |
| 99 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 100 | /* if page is completely empty, put it back on the free list, or dealloc it */ |
| 101 | /* if page was hijacked, unmark the flag so it might get alloced next time */ |
| 102 | /* Note: lock should be held when calling this */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 103 | static void bitmap_checkfree(struct bitmap *bitmap, unsigned long page) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 104 | { |
| 105 | char *ptr; |
| 106 | |
| 107 | if (bitmap->bp[page].count) /* page is still busy */ |
| 108 | return; |
| 109 | |
| 110 | /* page is no longer in use, it can be released */ |
| 111 | |
| 112 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ |
| 113 | bitmap->bp[page].hijacked = 0; |
| 114 | bitmap->bp[page].map = NULL; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 115 | } else { |
| 116 | /* normal case, free the page */ |
| 117 | ptr = bitmap->bp[page].map; |
| 118 | bitmap->bp[page].map = NULL; |
| 119 | bitmap->missing_pages++; |
NeilBrown | 792a1d4 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 120 | kfree(ptr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 121 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 122 | } |
| 123 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 124 | /* |
| 125 | * bitmap file handling - read and write the bitmap file and its superblock |
| 126 | */ |
| 127 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 128 | /* |
| 129 | * basic page I/O operations |
| 130 | */ |
| 131 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 132 | /* IO operations when bitmap is stored near all superblocks */ |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 133 | static int read_sb_page(struct mddev *mddev, loff_t offset, |
| 134 | struct page *page, |
| 135 | unsigned long index, int size) |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 136 | { |
| 137 | /* choose a good rdev and read the page from there */ |
| 138 | |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 139 | struct md_rdev *rdev; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 140 | sector_t target; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 141 | |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 142 | rdev_for_each(rdev, mddev) { |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 143 | if (! test_bit(In_sync, &rdev->flags) |
| 144 | || test_bit(Faulty, &rdev->flags)) |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 145 | continue; |
| 146 | |
Jonathan Brassow | ccebd4c | 2011-01-14 09:14:33 +1100 | [diff] [blame] | 147 | target = offset + index * (PAGE_SIZE/512); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 148 | |
NeilBrown | 2b19336 | 2010-10-27 15:16:40 +1100 | [diff] [blame] | 149 | if (sync_page_io(rdev, target, |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 150 | roundup(size, bdev_logical_block_size(rdev->bdev)), |
Jonathan Brassow | ccebd4c | 2011-01-14 09:14:33 +1100 | [diff] [blame] | 151 | page, READ, true)) { |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 152 | page->index = index; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 153 | return 0; |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 154 | } |
| 155 | } |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 156 | return -EIO; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 157 | } |
| 158 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 159 | static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev) |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 160 | { |
| 161 | /* Iterate the disks of an mddev, using rcu to protect access to the |
| 162 | * linked list, and raising the refcount of devices we return to ensure |
| 163 | * they don't disappear while in use. |
| 164 | * As devices are only added or removed when raid_disk is < 0 and |
| 165 | * nr_pending is 0 and In_sync is clear, the entries we return will |
| 166 | * still be in the same position on the list when we re-enter |
| 167 | * list_for_each_continue_rcu. |
| 168 | */ |
| 169 | struct list_head *pos; |
| 170 | rcu_read_lock(); |
| 171 | if (rdev == NULL) |
| 172 | /* start at the beginning */ |
| 173 | pos = &mddev->disks; |
| 174 | else { |
| 175 | /* release the previous rdev and start from there. */ |
| 176 | rdev_dec_pending(rdev, mddev); |
| 177 | pos = &rdev->same_set; |
| 178 | } |
| 179 | list_for_each_continue_rcu(pos, &mddev->disks) { |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 180 | rdev = list_entry(pos, struct md_rdev, same_set); |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 181 | if (rdev->raid_disk >= 0 && |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 182 | !test_bit(Faulty, &rdev->flags)) { |
| 183 | /* this is a usable devices */ |
| 184 | atomic_inc(&rdev->nr_pending); |
| 185 | rcu_read_unlock(); |
| 186 | return rdev; |
| 187 | } |
| 188 | } |
| 189 | rcu_read_unlock(); |
| 190 | return NULL; |
| 191 | } |
| 192 | |
NeilBrown | ab6085c | 2007-05-23 13:58:10 -0700 | [diff] [blame] | 193 | static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 194 | { |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 195 | struct md_rdev *rdev = NULL; |
Jonathan Brassow | a6ff7e0 | 2011-01-14 09:14:34 +1100 | [diff] [blame] | 196 | struct block_device *bdev; |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 197 | struct mddev *mddev = bitmap->mddev; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 198 | struct bitmap_storage *store = &bitmap->storage; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 199 | |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 200 | while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 201 | int size = PAGE_SIZE; |
| 202 | loff_t offset = mddev->bitmap_info.offset; |
Jonathan Brassow | a6ff7e0 | 2011-01-14 09:14:34 +1100 | [diff] [blame] | 203 | |
| 204 | bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; |
| 205 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 206 | if (page->index == store->file_pages-1) |
| 207 | size = roundup(store->last_page_size, |
Jonathan Brassow | a6ff7e0 | 2011-01-14 09:14:34 +1100 | [diff] [blame] | 208 | bdev_logical_block_size(bdev)); |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 209 | /* Just make sure we aren't corrupting data or |
| 210 | * metadata |
| 211 | */ |
| 212 | if (mddev->external) { |
| 213 | /* Bitmap could be anywhere. */ |
| 214 | if (rdev->sb_start + offset + (page->index |
| 215 | * (PAGE_SIZE/512)) |
| 216 | > rdev->data_offset |
| 217 | && |
| 218 | rdev->sb_start + offset |
| 219 | < (rdev->data_offset + mddev->dev_sectors |
| 220 | + (PAGE_SIZE/512))) |
| 221 | goto bad_alignment; |
| 222 | } else if (offset < 0) { |
| 223 | /* DATA BITMAP METADATA */ |
| 224 | if (offset |
| 225 | + (long)(page->index * (PAGE_SIZE/512)) |
| 226 | + size/512 > 0) |
| 227 | /* bitmap runs in to metadata */ |
| 228 | goto bad_alignment; |
| 229 | if (rdev->data_offset + mddev->dev_sectors |
| 230 | > rdev->sb_start + offset) |
| 231 | /* data runs in to bitmap */ |
| 232 | goto bad_alignment; |
| 233 | } else if (rdev->sb_start < rdev->data_offset) { |
| 234 | /* METADATA BITMAP DATA */ |
| 235 | if (rdev->sb_start |
| 236 | + offset |
| 237 | + page->index*(PAGE_SIZE/512) + size/512 |
| 238 | > rdev->data_offset) |
| 239 | /* bitmap runs in to data */ |
| 240 | goto bad_alignment; |
| 241 | } else { |
| 242 | /* DATA METADATA BITMAP - no problems */ |
| 243 | } |
| 244 | md_super_write(mddev, rdev, |
| 245 | rdev->sb_start + offset |
| 246 | + page->index * (PAGE_SIZE/512), |
| 247 | size, |
| 248 | page); |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 249 | } |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 250 | |
| 251 | if (wait) |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 252 | md_super_wait(mddev); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 253 | return 0; |
NeilBrown | 4b80991 | 2008-07-21 17:05:25 +1000 | [diff] [blame] | 254 | |
| 255 | bad_alignment: |
NeilBrown | 4b80991 | 2008-07-21 17:05:25 +1000 | [diff] [blame] | 256 | return -EINVAL; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 257 | } |
| 258 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 259 | static void bitmap_file_kick(struct bitmap *bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 260 | /* |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 261 | * write out a page to a file |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 262 | */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 263 | static void write_page(struct bitmap *bitmap, struct page *page, int wait) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 264 | { |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 265 | struct buffer_head *bh; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 266 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 267 | if (bitmap->storage.file == NULL) { |
NeilBrown | f0d76d7 | 2007-07-17 04:06:12 -0700 | [diff] [blame] | 268 | switch (write_sb_page(bitmap, page, wait)) { |
| 269 | case -EINVAL: |
| 270 | bitmap->flags |= BITMAP_WRITE_ERROR; |
NeilBrown | f0d76d7 | 2007-07-17 04:06:12 -0700 | [diff] [blame] | 271 | } |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 272 | } else { |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 273 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 274 | bh = page_buffers(page); |
NeilBrown | c708443 | 2006-01-06 00:20:45 -0800 | [diff] [blame] | 275 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 276 | while (bh && bh->b_blocknr) { |
| 277 | atomic_inc(&bitmap->pending_writes); |
| 278 | set_buffer_locked(bh); |
| 279 | set_buffer_mapped(bh); |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 280 | submit_bh(WRITE | REQ_SYNC, bh); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 281 | bh = bh->b_this_page; |
| 282 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 283 | |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 284 | if (wait) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 285 | wait_event(bitmap->write_wait, |
| 286 | atomic_read(&bitmap->pending_writes)==0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 287 | } |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 288 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
| 289 | bitmap_file_kick(bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 290 | } |
| 291 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 292 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 293 | { |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 294 | struct bitmap *bitmap = bh->b_private; |
| 295 | unsigned long flags; |
| 296 | |
| 297 | if (!uptodate) { |
| 298 | spin_lock_irqsave(&bitmap->lock, flags); |
| 299 | bitmap->flags |= BITMAP_WRITE_ERROR; |
| 300 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 301 | } |
| 302 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
| 303 | wake_up(&bitmap->write_wait); |
| 304 | } |
| 305 | |
| 306 | /* copied from buffer.c */ |
| 307 | static void |
| 308 | __clear_page_buffers(struct page *page) |
| 309 | { |
| 310 | ClearPagePrivate(page); |
| 311 | set_page_private(page, 0); |
| 312 | page_cache_release(page); |
| 313 | } |
| 314 | static void free_buffers(struct page *page) |
| 315 | { |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 316 | struct buffer_head *bh; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 317 | |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 318 | if (!PagePrivate(page)) |
| 319 | return; |
| 320 | |
| 321 | bh = page_buffers(page); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 322 | while (bh) { |
| 323 | struct buffer_head *next = bh->b_this_page; |
| 324 | free_buffer_head(bh); |
| 325 | bh = next; |
| 326 | } |
| 327 | __clear_page_buffers(page); |
| 328 | put_page(page); |
| 329 | } |
| 330 | |
| 331 | /* read a page from a file. |
| 332 | * We both read the page, and attach buffers to the page to record the |
| 333 | * address of each block (using bmap). These addresses will be used |
| 334 | * to write the block later, completely bypassing the filesystem. |
| 335 | * This usage is similar to how swap files are handled, and allows us |
| 336 | * to write to a file with no concerns of memory allocation failing. |
| 337 | */ |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 338 | static int read_page(struct file *file, unsigned long index, |
| 339 | struct bitmap *bitmap, |
| 340 | unsigned long count, |
| 341 | struct page *page) |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 342 | { |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 343 | int ret = 0; |
Josef Sipek | c649bb9 | 2006-12-08 02:37:19 -0800 | [diff] [blame] | 344 | struct inode *inode = file->f_path.dentry->d_inode; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 345 | struct buffer_head *bh; |
| 346 | sector_t block; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 347 | |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 348 | pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, |
| 349 | (unsigned long long)index << PAGE_SHIFT); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 350 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 351 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); |
| 352 | if (!bh) { |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 353 | ret = -ENOMEM; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 354 | goto out; |
| 355 | } |
| 356 | attach_page_buffers(page, bh); |
| 357 | block = index << (PAGE_SHIFT - inode->i_blkbits); |
| 358 | while (bh) { |
| 359 | if (count == 0) |
| 360 | bh->b_blocknr = 0; |
| 361 | else { |
| 362 | bh->b_blocknr = bmap(inode, block); |
| 363 | if (bh->b_blocknr == 0) { |
| 364 | /* Cannot use this file! */ |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 365 | ret = -EINVAL; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 366 | goto out; |
| 367 | } |
| 368 | bh->b_bdev = inode->i_sb->s_bdev; |
| 369 | if (count < (1<<inode->i_blkbits)) |
| 370 | count = 0; |
| 371 | else |
| 372 | count -= (1<<inode->i_blkbits); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 373 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 374 | bh->b_end_io = end_bitmap_write; |
| 375 | bh->b_private = bitmap; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 376 | atomic_inc(&bitmap->pending_writes); |
| 377 | set_buffer_locked(bh); |
| 378 | set_buffer_mapped(bh); |
| 379 | submit_bh(READ, bh); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 380 | } |
| 381 | block++; |
| 382 | bh = bh->b_this_page; |
| 383 | } |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 384 | page->index = index; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 385 | |
| 386 | wait_event(bitmap->write_wait, |
| 387 | atomic_read(&bitmap->pending_writes)==0); |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 388 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
| 389 | ret = -EIO; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 390 | out: |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 391 | if (ret) |
| 392 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %d\n", |
NeilBrown | 2d1f3b5 | 2006-01-06 00:20:31 -0800 | [diff] [blame] | 393 | (int)PAGE_SIZE, |
| 394 | (unsigned long long)index << PAGE_SHIFT, |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 395 | ret); |
| 396 | return ret; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | /* |
| 400 | * bitmap file superblock operations |
| 401 | */ |
| 402 | |
| 403 | /* update the event counter and sync the superblock to disk */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 404 | void bitmap_update_sb(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 405 | { |
| 406 | bitmap_super_t *sb; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 407 | |
| 408 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 409 | return; |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 410 | if (bitmap->mddev->bitmap_info.external) |
| 411 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 412 | if (!bitmap->storage.sb_page) /* no superblock */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 413 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 414 | sb = kmap_atomic(bitmap->storage.sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 415 | sb->events = cpu_to_le64(bitmap->mddev->events); |
NeilBrown | 8258c53 | 2011-05-11 14:26:30 +1000 | [diff] [blame] | 416 | if (bitmap->mddev->events < bitmap->events_cleared) |
Neil Brown | a0da84f | 2008-06-28 08:31:22 +1000 | [diff] [blame] | 417 | /* rocking back to read-only */ |
| 418 | bitmap->events_cleared = bitmap->mddev->events; |
NeilBrown | 8258c53 | 2011-05-11 14:26:30 +1000 | [diff] [blame] | 419 | sb->events_cleared = cpu_to_le64(bitmap->events_cleared); |
| 420 | sb->state = cpu_to_le32(bitmap->flags); |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 421 | /* Just in case these have been changed via sysfs: */ |
| 422 | sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); |
| 423 | sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 424 | kunmap_atomic(sb); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 425 | write_page(bitmap, bitmap->storage.sb_page, 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 426 | } |
| 427 | |
| 428 | /* print out the bitmap file superblock */ |
| 429 | void bitmap_print_sb(struct bitmap *bitmap) |
| 430 | { |
| 431 | bitmap_super_t *sb; |
| 432 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 433 | if (!bitmap || !bitmap->storage.sb_page) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 434 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 435 | sb = kmap_atomic(bitmap->storage.sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 436 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 437 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
| 438 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); |
| 439 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 440 | *(__u32 *)(sb->uuid+0), |
| 441 | *(__u32 *)(sb->uuid+4), |
| 442 | *(__u32 *)(sb->uuid+8), |
| 443 | *(__u32 *)(sb->uuid+12)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 444 | printk(KERN_DEBUG " events: %llu\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 445 | (unsigned long long) le64_to_cpu(sb->events)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 446 | printk(KERN_DEBUG "events cleared: %llu\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 447 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 448 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
| 449 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); |
| 450 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); |
| 451 | printk(KERN_DEBUG " sync size: %llu KB\n", |
| 452 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 453 | printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 454 | kunmap_atomic(sb); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 455 | } |
| 456 | |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 457 | /* |
| 458 | * bitmap_new_disk_sb |
| 459 | * @bitmap |
| 460 | * |
| 461 | * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb |
| 462 | * reads and verifies the on-disk bitmap superblock and populates bitmap_info. |
| 463 | * This function verifies 'bitmap_info' and populates the on-disk bitmap |
| 464 | * structure, which is to be written to disk. |
| 465 | * |
| 466 | * Returns: 0 on success, -Exxx on error |
| 467 | */ |
| 468 | static int bitmap_new_disk_sb(struct bitmap *bitmap) |
| 469 | { |
| 470 | bitmap_super_t *sb; |
| 471 | unsigned long chunksize, daemon_sleep, write_behind; |
| 472 | int err = -EINVAL; |
| 473 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 474 | bitmap->storage.sb_page = alloc_page(GFP_KERNEL); |
| 475 | if (IS_ERR(bitmap->storage.sb_page)) { |
| 476 | err = PTR_ERR(bitmap->storage.sb_page); |
| 477 | bitmap->storage.sb_page = NULL; |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 478 | return err; |
| 479 | } |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 480 | bitmap->storage.sb_page->index = 0; |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 481 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 482 | sb = kmap_atomic(bitmap->storage.sb_page); |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 483 | |
| 484 | sb->magic = cpu_to_le32(BITMAP_MAGIC); |
| 485 | sb->version = cpu_to_le32(BITMAP_MAJOR_HI); |
| 486 | |
| 487 | chunksize = bitmap->mddev->bitmap_info.chunksize; |
| 488 | BUG_ON(!chunksize); |
| 489 | if (!is_power_of_2(chunksize)) { |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 490 | kunmap_atomic(sb); |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 491 | printk(KERN_ERR "bitmap chunksize not a power of 2\n"); |
| 492 | return -EINVAL; |
| 493 | } |
| 494 | sb->chunksize = cpu_to_le32(chunksize); |
| 495 | |
| 496 | daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep; |
| 497 | if (!daemon_sleep || |
| 498 | (daemon_sleep < 1) || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) { |
| 499 | printk(KERN_INFO "Choosing daemon_sleep default (5 sec)\n"); |
| 500 | daemon_sleep = 5 * HZ; |
| 501 | } |
| 502 | sb->daemon_sleep = cpu_to_le32(daemon_sleep); |
| 503 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; |
| 504 | |
| 505 | /* |
| 506 | * FIXME: write_behind for RAID1. If not specified, what |
| 507 | * is a good choice? We choose COUNTER_MAX / 2 arbitrarily. |
| 508 | */ |
| 509 | write_behind = bitmap->mddev->bitmap_info.max_write_behind; |
| 510 | if (write_behind > COUNTER_MAX) |
| 511 | write_behind = COUNTER_MAX / 2; |
| 512 | sb->write_behind = cpu_to_le32(write_behind); |
| 513 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; |
| 514 | |
| 515 | /* keep the array size field of the bitmap superblock up to date */ |
| 516 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); |
| 517 | |
| 518 | memcpy(sb->uuid, bitmap->mddev->uuid, 16); |
| 519 | |
| 520 | bitmap->flags |= BITMAP_STALE; |
| 521 | sb->state |= cpu_to_le32(BITMAP_STALE); |
| 522 | bitmap->events_cleared = bitmap->mddev->events; |
| 523 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); |
| 524 | |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 525 | kunmap_atomic(sb); |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 526 | |
| 527 | return 0; |
| 528 | } |
| 529 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 530 | /* read the superblock from the bitmap file and initialize some bitmap fields */ |
| 531 | static int bitmap_read_sb(struct bitmap *bitmap) |
| 532 | { |
| 533 | char *reason = NULL; |
| 534 | bitmap_super_t *sb; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 535 | unsigned long chunksize, daemon_sleep, write_behind; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 536 | unsigned long long events; |
| 537 | int err = -EINVAL; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 538 | struct page *sb_page; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 539 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 540 | if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) { |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 541 | chunksize = 128 * 1024 * 1024; |
| 542 | daemon_sleep = 5 * HZ; |
| 543 | write_behind = 0; |
| 544 | bitmap->flags = BITMAP_STALE; |
| 545 | err = 0; |
| 546 | goto out_no_sb; |
| 547 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 548 | /* page 0 is the superblock, read it... */ |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 549 | sb_page = alloc_page(GFP_KERNEL); |
| 550 | if (!sb_page) |
| 551 | return -ENOMEM; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 552 | bitmap->storage.sb_page = sb_page; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 553 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 554 | if (bitmap->storage.file) { |
| 555 | loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host); |
NeilBrown | f49d5e6 | 2007-01-26 00:57:03 -0800 | [diff] [blame] | 556 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; |
| 557 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 558 | err = read_page(bitmap->storage.file, 0, |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 559 | bitmap, bytes, sb_page); |
NeilBrown | f49d5e6 | 2007-01-26 00:57:03 -0800 | [diff] [blame] | 560 | } else { |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 561 | err = read_sb_page(bitmap->mddev, |
| 562 | bitmap->mddev->bitmap_info.offset, |
| 563 | sb_page, |
| 564 | 0, sizeof(bitmap_super_t)); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 565 | } |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 566 | if (err) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 567 | return err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 568 | |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 569 | sb = kmap_atomic(sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 570 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 571 | chunksize = le32_to_cpu(sb->chunksize); |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 572 | daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 573 | write_behind = le32_to_cpu(sb->write_behind); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 574 | |
| 575 | /* verify that the bitmap-specific fields are valid */ |
| 576 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) |
| 577 | reason = "bad magic"; |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 578 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
| 579 | le32_to_cpu(sb->version) > BITMAP_MAJOR_HI) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 580 | reason = "unrecognized superblock version"; |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 581 | else if (chunksize < 512) |
NeilBrown | 7dd5d34 | 2006-01-06 00:20:39 -0800 | [diff] [blame] | 582 | reason = "bitmap chunksize too small"; |
Jonathan Brassow | d744540 | 2011-06-08 18:01:10 -0500 | [diff] [blame] | 583 | else if (!is_power_of_2(chunksize)) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 584 | reason = "bitmap chunksize not a power of 2"; |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 585 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) |
NeilBrown | 7dd5d34 | 2006-01-06 00:20:39 -0800 | [diff] [blame] | 586 | reason = "daemon sleep period out of range"; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 587 | else if (write_behind > COUNTER_MAX) |
| 588 | reason = "write-behind limit out of range (0 - 16383)"; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 589 | if (reason) { |
| 590 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", |
| 591 | bmname(bitmap), reason); |
| 592 | goto out; |
| 593 | } |
| 594 | |
| 595 | /* keep the array size field of the bitmap superblock up to date */ |
| 596 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); |
| 597 | |
NeilBrown | 278c1ca | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 598 | if (bitmap->mddev->persistent) { |
| 599 | /* |
| 600 | * We have a persistent array superblock, so compare the |
| 601 | * bitmap's UUID and event counter to the mddev's |
| 602 | */ |
| 603 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { |
| 604 | printk(KERN_INFO |
| 605 | "%s: bitmap superblock UUID mismatch\n", |
| 606 | bmname(bitmap)); |
| 607 | goto out; |
| 608 | } |
| 609 | events = le64_to_cpu(sb->events); |
| 610 | if (events < bitmap->mddev->events) { |
| 611 | printk(KERN_INFO |
| 612 | "%s: bitmap file is out of date (%llu < %llu) " |
| 613 | "-- forcing full recovery\n", |
| 614 | bmname(bitmap), events, |
| 615 | (unsigned long long) bitmap->mddev->events); |
| 616 | sb->state |= cpu_to_le32(BITMAP_STALE); |
| 617 | } |
| 618 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 619 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 620 | /* assign fields using values from superblock */ |
NeilBrown | 4f2e639 | 2006-10-21 10:24:09 -0700 | [diff] [blame] | 621 | bitmap->flags |= le32_to_cpu(sb->state); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 622 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
| 623 | bitmap->flags |= BITMAP_HOSTENDIAN; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 624 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
| 625 | err = 0; |
| 626 | out: |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 627 | kunmap_atomic(sb); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 628 | out_no_sb: |
| 629 | if (bitmap->flags & BITMAP_STALE) |
| 630 | bitmap->events_cleared = bitmap->mddev->events; |
| 631 | bitmap->mddev->bitmap_info.chunksize = chunksize; |
| 632 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; |
| 633 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 634 | if (err) |
| 635 | bitmap_print_sb(bitmap); |
| 636 | return err; |
| 637 | } |
| 638 | |
| 639 | enum bitmap_mask_op { |
| 640 | MASK_SET, |
| 641 | MASK_UNSET |
| 642 | }; |
| 643 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 644 | /* record the state of the bitmap in the superblock. Return the old value */ |
| 645 | static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, |
| 646 | enum bitmap_mask_op op) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 647 | { |
| 648 | bitmap_super_t *sb; |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 649 | int old; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 650 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 651 | if (!bitmap->storage.sb_page) /* can't set the state */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 652 | return 0; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 653 | sb = kmap_atomic(bitmap->storage.sb_page); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 654 | old = le32_to_cpu(sb->state) & bits; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 655 | switch (op) { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 656 | case MASK_SET: |
| 657 | sb->state |= cpu_to_le32(bits); |
NeilBrown | 8258c53 | 2011-05-11 14:26:30 +1000 | [diff] [blame] | 658 | bitmap->flags |= bits; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 659 | break; |
| 660 | case MASK_UNSET: |
| 661 | sb->state &= cpu_to_le32(~bits); |
NeilBrown | 8258c53 | 2011-05-11 14:26:30 +1000 | [diff] [blame] | 662 | bitmap->flags &= ~bits; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 663 | break; |
| 664 | default: |
| 665 | BUG(); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 666 | } |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 667 | kunmap_atomic(sb); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 668 | return old; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 669 | } |
| 670 | |
| 671 | /* |
| 672 | * general bitmap file operations |
| 673 | */ |
| 674 | |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 675 | /* |
| 676 | * on-disk bitmap: |
| 677 | * |
| 678 | * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap |
| 679 | * file a page at a time. There's a superblock at the start of the file. |
| 680 | */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 681 | /* calculate the index of the page that contains this bit */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 682 | static inline unsigned long file_page_index(struct bitmap_storage *store, |
| 683 | unsigned long chunk) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 684 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 685 | if (store->sb_page) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 686 | chunk += sizeof(bitmap_super_t) << 3; |
| 687 | return chunk >> PAGE_BIT_SHIFT; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 688 | } |
| 689 | |
| 690 | /* calculate the (bit) offset of this bit within a page */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 691 | static inline unsigned long file_page_offset(struct bitmap_storage *store, |
| 692 | unsigned long chunk) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 693 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 694 | if (store->sb_page) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 695 | chunk += sizeof(bitmap_super_t) << 3; |
| 696 | return chunk & (PAGE_BITS - 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 697 | } |
| 698 | |
| 699 | /* |
| 700 | * return a pointer to the page in the filemap that contains the given bit |
| 701 | * |
| 702 | * this lookup is complicated by the fact that the bitmap sb might be exactly |
| 703 | * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page |
| 704 | * 0 or page 1 |
| 705 | */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 706 | static inline struct page *filemap_get_page(struct bitmap_storage *store, |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 707 | unsigned long chunk) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 708 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 709 | if (file_page_index(store, chunk) >= store->file_pages) |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 710 | return NULL; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 711 | return store->filemap[file_page_index(store, chunk) |
| 712 | - file_page_index(store, 0)]; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 713 | } |
| 714 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 715 | static void bitmap_file_unmap(struct bitmap *bitmap) |
| 716 | { |
| 717 | struct page **map, *sb_page; |
| 718 | unsigned long *attr; |
| 719 | int pages; |
| 720 | unsigned long flags; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 721 | struct bitmap_storage *store = &bitmap->storage; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 722 | |
| 723 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 724 | map = store->filemap; |
| 725 | store->filemap = NULL; |
| 726 | attr = store->filemap_attr; |
| 727 | store->filemap_attr = NULL; |
| 728 | pages = store->file_pages; |
| 729 | store->file_pages = 0; |
| 730 | sb_page = store->sb_page; |
| 731 | store->sb_page = NULL; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 732 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 733 | |
| 734 | while (pages--) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 735 | if (map[pages] != sb_page) /* 0 is sb_page, release it below */ |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 736 | free_buffers(map[pages]); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 737 | kfree(map); |
| 738 | kfree(attr); |
| 739 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 740 | if (sb_page) |
| 741 | free_buffers(sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 742 | } |
| 743 | |
| 744 | static void bitmap_file_put(struct bitmap *bitmap) |
| 745 | { |
| 746 | struct file *file; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 747 | unsigned long flags; |
| 748 | |
| 749 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 750 | file = bitmap->storage.file; |
| 751 | bitmap->storage.file = NULL; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 752 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 753 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 754 | if (file) |
| 755 | wait_event(bitmap->write_wait, |
| 756 | atomic_read(&bitmap->pending_writes)==0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 757 | bitmap_file_unmap(bitmap); |
| 758 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 759 | if (file) { |
Josef Sipek | c649bb9 | 2006-12-08 02:37:19 -0800 | [diff] [blame] | 760 | struct inode *inode = file->f_path.dentry->d_inode; |
Andrew Morton | fc0ecff | 2007-02-10 01:45:39 -0800 | [diff] [blame] | 761 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 762 | fput(file); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 763 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 764 | } |
| 765 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 766 | /* |
| 767 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file |
| 768 | * then it is no longer reliable, so we stop using it and we mark the file |
| 769 | * as failed in the superblock |
| 770 | */ |
| 771 | static void bitmap_file_kick(struct bitmap *bitmap) |
| 772 | { |
| 773 | char *path, *ptr = NULL; |
| 774 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 775 | if (bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET) == 0) { |
| 776 | bitmap_update_sb(bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 777 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 778 | if (bitmap->storage.file) { |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 779 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 780 | if (path) |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 781 | ptr = d_path(&bitmap->storage.file->f_path, |
| 782 | path, PAGE_SIZE); |
Christoph Hellwig | 6bcfd60 | 2008-05-23 13:04:34 -0700 | [diff] [blame] | 783 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 784 | printk(KERN_ALERT |
| 785 | "%s: kicking failed bitmap file %s from array!\n", |
Christoph Hellwig | 6bcfd60 | 2008-05-23 13:04:34 -0700 | [diff] [blame] | 786 | bmname(bitmap), IS_ERR(ptr) ? "" : ptr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 787 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 788 | kfree(path); |
| 789 | } else |
| 790 | printk(KERN_ALERT |
| 791 | "%s: disabling internal bitmap due to errors\n", |
| 792 | bmname(bitmap)); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 793 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 794 | |
| 795 | bitmap_file_put(bitmap); |
| 796 | |
| 797 | return; |
| 798 | } |
| 799 | |
| 800 | enum bitmap_page_attr { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 801 | BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ |
NeilBrown | 5a537df | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 802 | BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned. |
| 803 | * i.e. counter is 1 or 2. */ |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 804 | BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 805 | }; |
| 806 | |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 807 | static inline void set_page_attr(struct bitmap *bitmap, int pnum, |
| 808 | enum bitmap_page_attr attr) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 809 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 810 | __set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 811 | } |
| 812 | |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 813 | static inline void clear_page_attr(struct bitmap *bitmap, int pnum, |
| 814 | enum bitmap_page_attr attr) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 815 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 816 | __clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 817 | } |
| 818 | |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 819 | static inline unsigned long test_page_attr(struct bitmap *bitmap, int pnum, |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 820 | enum bitmap_page_attr attr) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 821 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 822 | return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 823 | } |
| 824 | |
| 825 | /* |
| 826 | * bitmap_file_set_bit -- called before performing a write to the md device |
| 827 | * to set (and eventually sync) a particular bit in the bitmap file |
| 828 | * |
| 829 | * we set the bit immediately, then we record the page number so that |
| 830 | * when an unplug occurs, we can flush the dirty pages out to disk |
| 831 | */ |
| 832 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) |
| 833 | { |
| 834 | unsigned long bit; |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 835 | struct page *page; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 836 | void *kaddr; |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 837 | unsigned long chunk = block >> bitmap->chunkshift; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 838 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 839 | page = filemap_get_page(&bitmap->storage, chunk); |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 840 | if (!page) |
| 841 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 842 | bit = file_page_offset(&bitmap->storage, chunk); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 843 | |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 844 | /* set the bit */ |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 845 | kaddr = kmap_atomic(page); |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 846 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
| 847 | set_bit(bit, kaddr); |
| 848 | else |
| 849 | __set_bit_le(bit, kaddr); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 850 | kunmap_atomic(kaddr); |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 851 | pr_debug("set file bit %lu page %lu\n", bit, page->index); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 852 | /* record page number so it gets flushed to disk when unplug occurs */ |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 853 | set_page_attr(bitmap, page->index, BITMAP_PAGE_DIRTY); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 854 | } |
| 855 | |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 856 | static void bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block) |
| 857 | { |
| 858 | unsigned long bit; |
| 859 | struct page *page; |
| 860 | void *paddr; |
| 861 | unsigned long chunk = block >> bitmap->chunkshift; |
| 862 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 863 | page = filemap_get_page(&bitmap->storage, chunk); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 864 | if (!page) |
| 865 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 866 | bit = file_page_offset(&bitmap->storage, chunk); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 867 | paddr = kmap_atomic(page); |
| 868 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
| 869 | clear_bit(bit, paddr); |
| 870 | else |
| 871 | __clear_bit_le(bit, paddr); |
| 872 | kunmap_atomic(paddr); |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 873 | if (!test_page_attr(bitmap, page->index, BITMAP_PAGE_NEEDWRITE)) { |
| 874 | set_page_attr(bitmap, page->index, BITMAP_PAGE_PENDING); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 875 | bitmap->allclean = 0; |
| 876 | } |
| 877 | } |
| 878 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 879 | /* this gets called when the md device is ready to unplug its underlying |
| 880 | * (slave) device queues -- before we let any writes go down, we need to |
| 881 | * sync the dirty pages of the bitmap file to disk */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 882 | void bitmap_unplug(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 883 | { |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 884 | unsigned long i, flags; |
| 885 | int dirty, need_write; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 886 | int wait = 0; |
| 887 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 888 | if (!bitmap || !bitmap->storage.filemap) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 889 | return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 890 | |
| 891 | /* look at each page to see if there are any set bits that need to be |
| 892 | * flushed out to disk */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 893 | for (i = 0; i < bitmap->storage.file_pages; i++) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 894 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 895 | if (!bitmap->storage.filemap) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 896 | spin_unlock_irqrestore(&bitmap->lock, flags); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 897 | return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 898 | } |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 899 | dirty = test_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); |
| 900 | need_write = test_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE); |
| 901 | clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); |
| 902 | clear_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE); |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 903 | if (dirty || need_write) |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 904 | clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING); |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 905 | if (dirty) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 906 | wait = 1; |
| 907 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 908 | |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 909 | if (dirty || need_write) |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 910 | write_page(bitmap, bitmap->storage.filemap[i], 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 911 | } |
| 912 | if (wait) { /* if any writes were performed, we need to wait on them */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 913 | if (bitmap->storage.file) |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 914 | wait_event(bitmap->write_wait, |
| 915 | atomic_read(&bitmap->pending_writes)==0); |
NeilBrown | 0b79ccf | 2006-06-26 00:27:44 -0700 | [diff] [blame] | 916 | else |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 917 | md_super_wait(bitmap->mddev); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 918 | } |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 919 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
| 920 | bitmap_file_kick(bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 921 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 922 | EXPORT_SYMBOL(bitmap_unplug); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 923 | |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 924 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 925 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
| 926 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the |
| 927 | * memory mapping of the bitmap file |
| 928 | * Special cases: |
| 929 | * if there's no bitmap file, or if the bitmap file had been |
| 930 | * previously kicked from the array, we mark all the bits as |
| 931 | * 1's in order to cause a full resync. |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 932 | * |
| 933 | * We ignore all bits for sectors that end earlier than 'start'. |
| 934 | * This is used when reading an out-of-date bitmap... |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 935 | */ |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 936 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 937 | { |
| 938 | unsigned long i, chunks, index, oldindex, bit; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 939 | int pnum; |
| 940 | struct page *page = NULL; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 941 | unsigned long num_pages, bit_cnt = 0; |
| 942 | struct file *file; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 943 | unsigned long bytes, offset; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 944 | int outofdate; |
| 945 | int ret = -ENOSPC; |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 946 | void *paddr; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 947 | struct bitmap_storage *store = &bitmap->storage; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 948 | |
| 949 | chunks = bitmap->chunks; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 950 | file = store->file; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 951 | |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 952 | if (!file && !bitmap->mddev->bitmap_info.offset) { |
| 953 | /* No permanent bitmap - fill with '1s'. */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 954 | store->filemap = NULL; |
| 955 | store->file_pages = 0; |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 956 | for (i = 0; i < chunks ; i++) { |
| 957 | /* if the disk bit is set, set the memory bit */ |
| 958 | int needed = ((sector_t)(i+1) << (bitmap->chunkshift) |
| 959 | >= start); |
| 960 | bitmap_set_memory_bits(bitmap, |
| 961 | (sector_t)i << bitmap->chunkshift, |
| 962 | needed); |
| 963 | } |
| 964 | return 0; |
| 965 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 966 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 967 | outofdate = bitmap->flags & BITMAP_STALE; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 968 | if (outofdate) |
| 969 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " |
| 970 | "recovery\n", bmname(bitmap)); |
| 971 | |
NeilBrown | e384e58 | 2010-06-01 19:37:34 +1000 | [diff] [blame] | 972 | bytes = DIV_ROUND_UP(bitmap->chunks, 8); |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 973 | if (!bitmap->mddev->bitmap_info.external) |
| 974 | bytes += sizeof(bitmap_super_t); |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 975 | |
NeilBrown | e384e58 | 2010-06-01 19:37:34 +1000 | [diff] [blame] | 976 | num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 977 | |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 978 | if (file && i_size_read(file->f_mapping->host) < bytes) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 979 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
| 980 | bmname(bitmap), |
| 981 | (unsigned long) i_size_read(file->f_mapping->host), |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 982 | bytes); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 983 | goto err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 984 | } |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 985 | |
| 986 | ret = -ENOMEM; |
| 987 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 988 | store->filemap = kmalloc(sizeof(struct page *) |
| 989 | * num_pages, GFP_KERNEL); |
| 990 | if (!store->filemap) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 991 | goto err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 992 | |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 993 | pnum = 0; |
| 994 | offset = 0; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 995 | if (store->sb_page) { |
| 996 | store->filemap[0] = store->sb_page; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 997 | pnum = 1; |
| 998 | offset = sizeof(bitmap_super_t); |
| 999 | } |
| 1000 | for ( ; pnum < num_pages; pnum++) { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1001 | store->filemap[pnum] = alloc_page(GFP_KERNEL); |
| 1002 | if (!store->filemap[pnum]) { |
| 1003 | store->file_pages = pnum; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1004 | goto err; |
| 1005 | } |
| 1006 | } |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1007 | store->file_pages = pnum; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1008 | |
NeilBrown | e16b68b | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 1009 | /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1010 | store->filemap_attr = kzalloc( |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1011 | roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), |
NeilBrown | e16b68b | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 1012 | GFP_KERNEL); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1013 | if (!store->filemap_attr) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1014 | goto err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1015 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1016 | oldindex = ~0L; |
| 1017 | |
| 1018 | for (i = 0; i < chunks; i++) { |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1019 | int b; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1020 | index = file_page_index(&bitmap->storage, i); |
| 1021 | bit = file_page_offset(&bitmap->storage, i); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1022 | if (index != oldindex) { /* this is a new page, read it in */ |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 1023 | int count; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1024 | /* unmap the old page, we're done with it */ |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 1025 | if (index == num_pages-1) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1026 | count = bytes - index * PAGE_SIZE; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 1027 | else |
| 1028 | count = PAGE_SIZE; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1029 | page = store->filemap[index]; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1030 | if (file) |
| 1031 | ret = read_page(file, index, bitmap, |
| 1032 | count, page); |
| 1033 | else |
| 1034 | ret = read_sb_page( |
| 1035 | bitmap->mddev, |
| 1036 | bitmap->mddev->bitmap_info.offset, |
| 1037 | page, |
| 1038 | index, count); |
| 1039 | |
| 1040 | if (ret) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1041 | goto err; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1042 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1043 | oldindex = index; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1044 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1045 | store->last_page_size = count; |
NeilBrown | b74fd28 | 2009-05-07 12:47:19 +1000 | [diff] [blame] | 1046 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1047 | if (outofdate) { |
| 1048 | /* |
| 1049 | * if bitmap is out of date, dirty the |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1050 | * whole page and write it out |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1051 | */ |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 1052 | paddr = kmap_atomic(page); |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 1053 | memset(paddr + offset, 0xff, |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1054 | PAGE_SIZE - offset); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 1055 | kunmap_atomic(paddr); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1056 | write_page(bitmap, page, 1); |
| 1057 | |
| 1058 | ret = -EIO; |
NeilBrown | b74fd28 | 2009-05-07 12:47:19 +1000 | [diff] [blame] | 1059 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1060 | goto err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1061 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1062 | } |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 1063 | paddr = kmap_atomic(page); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1064 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 1065 | b = test_bit(bit, paddr); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1066 | else |
Akinobu Mita | 6b33aff | 2011-03-23 16:42:13 -0700 | [diff] [blame] | 1067 | b = test_bit_le(bit, paddr); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 1068 | kunmap_atomic(paddr); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1069 | if (b) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1070 | /* if the disk bit is set, set the memory bit */ |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1071 | int needed = ((sector_t)(i+1) << bitmap->chunkshift |
NeilBrown | db305e5 | 2009-05-07 12:49:06 +1000 | [diff] [blame] | 1072 | >= start); |
| 1073 | bitmap_set_memory_bits(bitmap, |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1074 | (sector_t)i << bitmap->chunkshift, |
NeilBrown | db305e5 | 2009-05-07 12:49:06 +1000 | [diff] [blame] | 1075 | needed); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1076 | bit_cnt++; |
| 1077 | } |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1078 | offset = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1079 | } |
| 1080 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1081 | printk(KERN_INFO "%s: bitmap initialized from disk: " |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 1082 | "read %lu/%lu pages, set %lu of %lu bits\n", |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1083 | bmname(bitmap), store->file_pages, |
| 1084 | num_pages, bit_cnt, chunks); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1085 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1086 | return 0; |
| 1087 | |
| 1088 | err: |
| 1089 | printk(KERN_INFO "%s: bitmap initialisation failed: %d\n", |
| 1090 | bmname(bitmap), ret); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1091 | return ret; |
| 1092 | } |
| 1093 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1094 | void bitmap_write_all(struct bitmap *bitmap) |
| 1095 | { |
| 1096 | /* We don't actually write all bitmap blocks here, |
| 1097 | * just flag them as needing to be written |
| 1098 | */ |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 1099 | int i; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1100 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1101 | if (!bitmap || !bitmap->storage.filemap) |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1102 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1103 | if (bitmap->storage.file) |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1104 | /* Only one copy, so nothing needed */ |
| 1105 | return; |
| 1106 | |
NeilBrown | 7c8f424 | 2011-11-23 10:18:52 +1100 | [diff] [blame] | 1107 | spin_lock_irq(&bitmap->lock); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1108 | for (i = 0; i < bitmap->storage.file_pages; i++) |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1109 | set_page_attr(bitmap, i, |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 1110 | BITMAP_PAGE_NEEDWRITE); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1111 | bitmap->allclean = 0; |
NeilBrown | 7c8f424 | 2011-11-23 10:18:52 +1100 | [diff] [blame] | 1112 | spin_unlock_irq(&bitmap->lock); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1113 | } |
| 1114 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1115 | static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc) |
| 1116 | { |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1117 | sector_t chunk = offset >> bitmap->chunkshift; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1118 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 1119 | bitmap->bp[page].count += inc; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1120 | bitmap_checkfree(bitmap, page); |
| 1121 | } |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1122 | |
| 1123 | static void bitmap_set_pending(struct bitmap *bitmap, sector_t offset) |
| 1124 | { |
| 1125 | sector_t chunk = offset >> bitmap->chunkshift; |
| 1126 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 1127 | struct bitmap_page *bp = &bitmap->bp[page]; |
| 1128 | |
| 1129 | if (!bp->pending) |
| 1130 | bp->pending = 1; |
| 1131 | } |
| 1132 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1133 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1134 | sector_t offset, sector_t *blocks, |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1135 | int create); |
| 1136 | |
| 1137 | /* |
| 1138 | * bitmap daemon -- periodically wakes up to clean bits and flush pages |
| 1139 | * out to disk |
| 1140 | */ |
| 1141 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1142 | void bitmap_daemon_work(struct mddev *mddev) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1143 | { |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1144 | struct bitmap *bitmap; |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1145 | unsigned long j; |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1146 | unsigned long nextpage; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1147 | unsigned long flags; |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1148 | sector_t blocks; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1149 | |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1150 | /* Use a mutex to guard daemon_work against |
| 1151 | * bitmap_destroy. |
| 1152 | */ |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1153 | mutex_lock(&mddev->bitmap_info.mutex); |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1154 | bitmap = mddev->bitmap; |
| 1155 | if (bitmap == NULL) { |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1156 | mutex_unlock(&mddev->bitmap_info.mutex); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1157 | return; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1158 | } |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1159 | if (time_before(jiffies, bitmap->daemon_lastrun |
NeilBrown | 2e61ebb | 2011-12-23 10:17:50 +1100 | [diff] [blame] | 1160 | + mddev->bitmap_info.daemon_sleep)) |
NeilBrown | 7be3dfe | 2008-03-10 11:43:48 -0700 | [diff] [blame] | 1161 | goto done; |
| 1162 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1163 | bitmap->daemon_lastrun = jiffies; |
NeilBrown | 8311c29 | 2008-03-04 14:29:30 -0800 | [diff] [blame] | 1164 | if (bitmap->allclean) { |
NeilBrown | 2e61ebb | 2011-12-23 10:17:50 +1100 | [diff] [blame] | 1165 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1166 | goto done; |
NeilBrown | 8311c29 | 2008-03-04 14:29:30 -0800 | [diff] [blame] | 1167 | } |
| 1168 | bitmap->allclean = 1; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1169 | |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1170 | /* Any file-page which is PENDING now needs to be written. |
| 1171 | * So set NEEDWRITE now, then after we make any last-minute changes |
| 1172 | * we will write it. |
| 1173 | */ |
NeilBrown | be51269 | 2009-05-26 09:41:17 +1000 | [diff] [blame] | 1174 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1175 | for (j = 0; j < bitmap->storage.file_pages; j++) |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1176 | if (test_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1177 | BITMAP_PAGE_PENDING)) { |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1178 | set_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1179 | BITMAP_PAGE_NEEDWRITE); |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1180 | clear_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1181 | BITMAP_PAGE_PENDING); |
| 1182 | } |
| 1183 | |
| 1184 | if (bitmap->need_sync && |
| 1185 | mddev->bitmap_info.external == 0) { |
| 1186 | /* Arrange for superblock update as well as |
| 1187 | * other changes */ |
| 1188 | bitmap_super_t *sb; |
| 1189 | bitmap->need_sync = 0; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1190 | if (bitmap->storage.filemap) { |
| 1191 | sb = kmap_atomic(bitmap->storage.sb_page); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1192 | sb->events_cleared = |
| 1193 | cpu_to_le64(bitmap->events_cleared); |
| 1194 | kunmap_atomic(sb); |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1195 | set_page_attr(bitmap, 0, |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1196 | BITMAP_PAGE_NEEDWRITE); |
| 1197 | } |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1198 | } |
| 1199 | /* Now look at the bitmap counters and if any are '2' or '1', |
| 1200 | * decrement and handle accordingly. |
| 1201 | */ |
| 1202 | nextpage = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1203 | for (j = 0; j < bitmap->chunks; j++) { |
| 1204 | bitmap_counter_t *bmc; |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1205 | sector_t block = (sector_t)j << bitmap->chunkshift; |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1206 | |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1207 | if (j == nextpage) { |
| 1208 | nextpage += PAGE_COUNTER_RATIO; |
| 1209 | if (!bitmap->bp[j >> PAGE_COUNTER_SHIFT].pending) { |
| 1210 | j |= PAGE_COUNTER_MASK; |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1211 | continue; |
| 1212 | } |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1213 | bitmap->bp[j >> PAGE_COUNTER_SHIFT].pending = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1214 | } |
NeilBrown | db305e5 | 2009-05-07 12:49:06 +1000 | [diff] [blame] | 1215 | bmc = bitmap_get_counter(bitmap, |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1216 | block, |
NeilBrown | db305e5 | 2009-05-07 12:49:06 +1000 | [diff] [blame] | 1217 | &blocks, 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1218 | |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1219 | if (!bmc) { |
| 1220 | j |= PAGE_COUNTER_MASK; |
| 1221 | continue; |
| 1222 | } |
| 1223 | if (*bmc == 1 && !bitmap->need_sync) { |
| 1224 | /* We can clear the bit */ |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1225 | *bmc = 0; |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1226 | bitmap_count_page(bitmap, block, -1); |
| 1227 | bitmap_file_clear_bit(bitmap, block); |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1228 | } else if (*bmc && *bmc <= 2) { |
| 1229 | *bmc = 1; |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1230 | bitmap_set_pending(bitmap, block); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1231 | bitmap->allclean = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1232 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1233 | } |
| 1234 | |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1235 | /* Now start writeout on any page in NEEDWRITE that isn't DIRTY. |
| 1236 | * DIRTY pages need to be written by bitmap_unplug so it can wait |
| 1237 | * for them. |
| 1238 | * If we find any DIRTY page we stop there and let bitmap_unplug |
| 1239 | * handle all the rest. This is important in the case where |
| 1240 | * the first blocking holds the superblock and it has been updated. |
| 1241 | * We mustn't write any other blocks before the superblock. |
| 1242 | */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1243 | for (j = 0; j < bitmap->storage.file_pages; j++) { |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1244 | |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1245 | if (test_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1246 | BITMAP_PAGE_DIRTY)) |
| 1247 | /* bitmap_unplug will handle the rest */ |
| 1248 | break; |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1249 | if (test_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1250 | BITMAP_PAGE_NEEDWRITE)) { |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1251 | clear_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1252 | BITMAP_PAGE_NEEDWRITE); |
| 1253 | spin_unlock_irqrestore(&bitmap->lock, flags); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1254 | write_page(bitmap, bitmap->storage.filemap[j], 0); |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1255 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1256 | if (!bitmap->storage.filemap) |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1257 | break; |
| 1258 | } |
| 1259 | } |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1260 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1261 | |
NeilBrown | 7be3dfe | 2008-03-10 11:43:48 -0700 | [diff] [blame] | 1262 | done: |
NeilBrown | 8311c29 | 2008-03-04 14:29:30 -0800 | [diff] [blame] | 1263 | if (bitmap->allclean == 0) |
NeilBrown | 2e61ebb | 2011-12-23 10:17:50 +1100 | [diff] [blame] | 1264 | mddev->thread->timeout = |
| 1265 | mddev->bitmap_info.daemon_sleep; |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1266 | mutex_unlock(&mddev->bitmap_info.mutex); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1267 | } |
| 1268 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1269 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1270 | sector_t offset, sector_t *blocks, |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1271 | int create) |
NeilBrown | ee305ac | 2009-09-23 18:06:44 +1000 | [diff] [blame] | 1272 | __releases(bitmap->lock) |
| 1273 | __acquires(bitmap->lock) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1274 | { |
| 1275 | /* If 'create', we might release the lock and reclaim it. |
| 1276 | * The lock must have been taken with interrupts enabled. |
| 1277 | * If !create, we don't release the lock. |
| 1278 | */ |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1279 | sector_t chunk = offset >> bitmap->chunkshift; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1280 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 1281 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; |
| 1282 | sector_t csize; |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1283 | int err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1284 | |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1285 | err = bitmap_checkpage(bitmap, page, create); |
| 1286 | |
| 1287 | if (bitmap->bp[page].hijacked || |
| 1288 | bitmap->bp[page].map == NULL) |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1289 | csize = ((sector_t)1) << (bitmap->chunkshift + |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1290 | PAGE_COUNTER_SHIFT - 1); |
| 1291 | else |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1292 | csize = ((sector_t)1) << bitmap->chunkshift; |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1293 | *blocks = csize - (offset & (csize - 1)); |
| 1294 | |
| 1295 | if (err < 0) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1296 | return NULL; |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1297 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1298 | /* now locked ... */ |
| 1299 | |
| 1300 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ |
| 1301 | /* should we use the first or second counter field |
| 1302 | * of the hijacked pointer? */ |
| 1303 | int hi = (pageoff > PAGE_COUNTER_MASK); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1304 | return &((bitmap_counter_t *) |
| 1305 | &bitmap->bp[page].map)[hi]; |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1306 | } else /* page is allocated */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1307 | return (bitmap_counter_t *) |
| 1308 | &(bitmap->bp[page].map[pageoff]); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1309 | } |
| 1310 | |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1311 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1312 | { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1313 | if (!bitmap) |
| 1314 | return 0; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1315 | |
| 1316 | if (behind) { |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 1317 | int bw; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1318 | atomic_inc(&bitmap->behind_writes); |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 1319 | bw = atomic_read(&bitmap->behind_writes); |
| 1320 | if (bw > bitmap->behind_writes_used) |
| 1321 | bitmap->behind_writes_used = bw; |
| 1322 | |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 1323 | pr_debug("inc write-behind count %d/%lu\n", |
| 1324 | bw, bitmap->mddev->bitmap_info.max_write_behind); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1325 | } |
| 1326 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1327 | while (sectors) { |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1328 | sector_t blocks; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1329 | bitmap_counter_t *bmc; |
| 1330 | |
| 1331 | spin_lock_irq(&bitmap->lock); |
| 1332 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 1); |
| 1333 | if (!bmc) { |
| 1334 | spin_unlock_irq(&bitmap->lock); |
| 1335 | return 0; |
| 1336 | } |
| 1337 | |
Namhyung Kim | 27d5ea0 | 2011-06-09 11:42:57 +1000 | [diff] [blame] | 1338 | if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) { |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1339 | DEFINE_WAIT(__wait); |
| 1340 | /* note that it is safe to do the prepare_to_wait |
| 1341 | * after the test as long as we do it before dropping |
| 1342 | * the spinlock. |
| 1343 | */ |
| 1344 | prepare_to_wait(&bitmap->overflow_wait, &__wait, |
| 1345 | TASK_UNINTERRUPTIBLE); |
| 1346 | spin_unlock_irq(&bitmap->lock); |
Jens Axboe | 7eaceac | 2011-03-10 08:52:07 +0100 | [diff] [blame] | 1347 | io_schedule(); |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1348 | finish_wait(&bitmap->overflow_wait, &__wait); |
| 1349 | continue; |
| 1350 | } |
| 1351 | |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1352 | switch (*bmc) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1353 | case 0: |
| 1354 | bitmap_file_set_bit(bitmap, offset); |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1355 | bitmap_count_page(bitmap, offset, 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1356 | /* fall through */ |
| 1357 | case 1: |
| 1358 | *bmc = 2; |
| 1359 | } |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1360 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1361 | (*bmc)++; |
| 1362 | |
| 1363 | spin_unlock_irq(&bitmap->lock); |
| 1364 | |
| 1365 | offset += blocks; |
| 1366 | if (sectors > blocks) |
| 1367 | sectors -= blocks; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1368 | else |
| 1369 | sectors = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1370 | } |
| 1371 | return 0; |
| 1372 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1373 | EXPORT_SYMBOL(bitmap_startwrite); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1374 | |
| 1375 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1376 | int success, int behind) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1377 | { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1378 | if (!bitmap) |
| 1379 | return; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1380 | if (behind) { |
NeilBrown | e555190 | 2010-03-31 11:21:44 +1100 | [diff] [blame] | 1381 | if (atomic_dec_and_test(&bitmap->behind_writes)) |
| 1382 | wake_up(&bitmap->behind_wait); |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 1383 | pr_debug("dec write-behind count %d/%lu\n", |
| 1384 | atomic_read(&bitmap->behind_writes), |
| 1385 | bitmap->mddev->bitmap_info.max_write_behind); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1386 | } |
| 1387 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1388 | while (sectors) { |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1389 | sector_t blocks; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1390 | unsigned long flags; |
| 1391 | bitmap_counter_t *bmc; |
| 1392 | |
| 1393 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1394 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 0); |
| 1395 | if (!bmc) { |
| 1396 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1397 | return; |
| 1398 | } |
| 1399 | |
NeilBrown | 961902c | 2011-12-23 09:57:48 +1100 | [diff] [blame] | 1400 | if (success && !bitmap->mddev->degraded && |
Neil Brown | a0da84f | 2008-06-28 08:31:22 +1000 | [diff] [blame] | 1401 | bitmap->events_cleared < bitmap->mddev->events) { |
| 1402 | bitmap->events_cleared = bitmap->mddev->events; |
| 1403 | bitmap->need_sync = 1; |
NeilBrown | 5ff5aff | 2010-06-01 19:37:32 +1000 | [diff] [blame] | 1404 | sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); |
Neil Brown | a0da84f | 2008-06-28 08:31:22 +1000 | [diff] [blame] | 1405 | } |
| 1406 | |
Namhyung Kim | 27d5ea0 | 2011-06-09 11:42:57 +1000 | [diff] [blame] | 1407 | if (!success && !NEEDED(*bmc)) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1408 | *bmc |= NEEDED_MASK; |
| 1409 | |
Namhyung Kim | 27d5ea0 | 2011-06-09 11:42:57 +1000 | [diff] [blame] | 1410 | if (COUNTER(*bmc) == COUNTER_MAX) |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1411 | wake_up(&bitmap->overflow_wait); |
| 1412 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1413 | (*bmc)--; |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1414 | if (*bmc <= 2) { |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1415 | bitmap_set_pending(bitmap, offset); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1416 | bitmap->allclean = 0; |
| 1417 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1418 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1419 | offset += blocks; |
| 1420 | if (sectors > blocks) |
| 1421 | sectors -= blocks; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1422 | else |
| 1423 | sectors = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1424 | } |
| 1425 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1426 | EXPORT_SYMBOL(bitmap_endwrite); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1427 | |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1428 | static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 1429 | int degraded) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1430 | { |
| 1431 | bitmap_counter_t *bmc; |
| 1432 | int rv; |
| 1433 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ |
| 1434 | *blocks = 1024; |
| 1435 | return 1; /* always resync if no bitmap */ |
| 1436 | } |
| 1437 | spin_lock_irq(&bitmap->lock); |
| 1438 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); |
| 1439 | rv = 0; |
| 1440 | if (bmc) { |
| 1441 | /* locked */ |
| 1442 | if (RESYNC(*bmc)) |
| 1443 | rv = 1; |
| 1444 | else if (NEEDED(*bmc)) { |
| 1445 | rv = 1; |
NeilBrown | 6a806c5 | 2005-07-15 03:56:35 -0700 | [diff] [blame] | 1446 | if (!degraded) { /* don't set/clear bits if degraded */ |
| 1447 | *bmc |= RESYNC_MASK; |
| 1448 | *bmc &= ~NEEDED_MASK; |
| 1449 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1450 | } |
| 1451 | } |
| 1452 | spin_unlock_irq(&bitmap->lock); |
| 1453 | return rv; |
| 1454 | } |
| 1455 | |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1456 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 1457 | int degraded) |
| 1458 | { |
| 1459 | /* bitmap_start_sync must always report on multiples of whole |
| 1460 | * pages, otherwise resync (which is very PAGE_SIZE based) will |
| 1461 | * get confused. |
| 1462 | * So call __bitmap_start_sync repeatedly (if needed) until |
| 1463 | * At least PAGE_SIZE>>9 blocks are covered. |
| 1464 | * Return the 'or' of the result. |
| 1465 | */ |
| 1466 | int rv = 0; |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1467 | sector_t blocks1; |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 1468 | |
| 1469 | *blocks = 0; |
| 1470 | while (*blocks < (PAGE_SIZE>>9)) { |
| 1471 | rv |= __bitmap_start_sync(bitmap, offset, |
| 1472 | &blocks1, degraded); |
| 1473 | offset += blocks1; |
| 1474 | *blocks += blocks1; |
| 1475 | } |
| 1476 | return rv; |
| 1477 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1478 | EXPORT_SYMBOL(bitmap_start_sync); |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 1479 | |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1480 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1481 | { |
| 1482 | bitmap_counter_t *bmc; |
| 1483 | unsigned long flags; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1484 | |
| 1485 | if (bitmap == NULL) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1486 | *blocks = 1024; |
| 1487 | return; |
| 1488 | } |
| 1489 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1490 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); |
| 1491 | if (bmc == NULL) |
| 1492 | goto unlock; |
| 1493 | /* locked */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1494 | if (RESYNC(*bmc)) { |
| 1495 | *bmc &= ~RESYNC_MASK; |
| 1496 | |
| 1497 | if (!NEEDED(*bmc) && aborted) |
| 1498 | *bmc |= NEEDED_MASK; |
| 1499 | else { |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1500 | if (*bmc <= 2) { |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1501 | bitmap_set_pending(bitmap, offset); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1502 | bitmap->allclean = 0; |
| 1503 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1504 | } |
| 1505 | } |
| 1506 | unlock: |
| 1507 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1508 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1509 | EXPORT_SYMBOL(bitmap_end_sync); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1510 | |
| 1511 | void bitmap_close_sync(struct bitmap *bitmap) |
| 1512 | { |
| 1513 | /* Sync has finished, and any bitmap chunks that weren't synced |
| 1514 | * properly have been aborted. It remains to us to clear the |
| 1515 | * RESYNC bit wherever it is still on |
| 1516 | */ |
| 1517 | sector_t sector = 0; |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1518 | sector_t blocks; |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1519 | if (!bitmap) |
| 1520 | return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1521 | while (sector < bitmap->mddev->resync_max_sectors) { |
| 1522 | bitmap_end_sync(bitmap, sector, &blocks, 0); |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1523 | sector += blocks; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1524 | } |
| 1525 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1526 | EXPORT_SYMBOL(bitmap_close_sync); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1527 | |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1528 | void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector) |
| 1529 | { |
| 1530 | sector_t s = 0; |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1531 | sector_t blocks; |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1532 | |
| 1533 | if (!bitmap) |
| 1534 | return; |
| 1535 | if (sector == 0) { |
| 1536 | bitmap->last_end_sync = jiffies; |
| 1537 | return; |
| 1538 | } |
| 1539 | if (time_before(jiffies, (bitmap->last_end_sync |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1540 | + bitmap->mddev->bitmap_info.daemon_sleep))) |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1541 | return; |
| 1542 | wait_event(bitmap->mddev->recovery_wait, |
| 1543 | atomic_read(&bitmap->mddev->recovery_active) == 0); |
| 1544 | |
NeilBrown | 75d3da4 | 2011-01-14 09:14:34 +1100 | [diff] [blame] | 1545 | bitmap->mddev->curr_resync_completed = sector; |
NeilBrown | 070dc6d | 2010-08-30 17:33:34 +1000 | [diff] [blame] | 1546 | set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags); |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1547 | sector &= ~((1ULL << bitmap->chunkshift) - 1); |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1548 | s = 0; |
| 1549 | while (s < sector && s < bitmap->mddev->resync_max_sectors) { |
| 1550 | bitmap_end_sync(bitmap, s, &blocks, 0); |
| 1551 | s += blocks; |
| 1552 | } |
| 1553 | bitmap->last_end_sync = jiffies; |
NeilBrown | acb180b | 2009-04-14 16:28:34 +1000 | [diff] [blame] | 1554 | sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed"); |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1555 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1556 | EXPORT_SYMBOL(bitmap_cond_end_sync); |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1557 | |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1558 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1559 | { |
| 1560 | /* For each chunk covered by any of these sectors, set the |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1561 | * counter to 2 and possibly set resync_needed. They should all |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1562 | * be 0 at this point |
| 1563 | */ |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1564 | |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1565 | sector_t secs; |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1566 | bitmap_counter_t *bmc; |
| 1567 | spin_lock_irq(&bitmap->lock); |
| 1568 | bmc = bitmap_get_counter(bitmap, offset, &secs, 1); |
| 1569 | if (!bmc) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1570 | spin_unlock_irq(&bitmap->lock); |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1571 | return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1572 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1573 | if (!*bmc) { |
NeilBrown | 915c420 | 2011-12-23 10:17:51 +1100 | [diff] [blame] | 1574 | *bmc = 2 | (needed ? NEEDED_MASK : 0); |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1575 | bitmap_count_page(bitmap, offset, 1); |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1576 | bitmap_set_pending(bitmap, offset); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1577 | bitmap->allclean = 0; |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1578 | } |
| 1579 | spin_unlock_irq(&bitmap->lock); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1580 | } |
| 1581 | |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 1582 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
| 1583 | void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) |
| 1584 | { |
| 1585 | unsigned long chunk; |
| 1586 | |
| 1587 | for (chunk = s; chunk <= e; chunk++) { |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1588 | sector_t sec = (sector_t)chunk << bitmap->chunkshift; |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 1589 | bitmap_set_memory_bits(bitmap, sec, 1); |
NeilBrown | 7c8f424 | 2011-11-23 10:18:52 +1100 | [diff] [blame] | 1590 | spin_lock_irq(&bitmap->lock); |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 1591 | bitmap_file_set_bit(bitmap, sec); |
NeilBrown | 7c8f424 | 2011-11-23 10:18:52 +1100 | [diff] [blame] | 1592 | spin_unlock_irq(&bitmap->lock); |
NeilBrown | ffa2332 | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1593 | if (sec < bitmap->mddev->recovery_cp) |
| 1594 | /* We are asserting that the array is dirty, |
| 1595 | * so move the recovery_cp address back so |
| 1596 | * that it is obvious that it is dirty |
| 1597 | */ |
| 1598 | bitmap->mddev->recovery_cp = sec; |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 1599 | } |
| 1600 | } |
| 1601 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1602 | /* |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1603 | * flush out any pending updates |
| 1604 | */ |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1605 | void bitmap_flush(struct mddev *mddev) |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1606 | { |
| 1607 | struct bitmap *bitmap = mddev->bitmap; |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1608 | long sleep; |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1609 | |
| 1610 | if (!bitmap) /* there was no bitmap */ |
| 1611 | return; |
| 1612 | |
| 1613 | /* run the daemon_work three time to ensure everything is flushed |
| 1614 | * that can be |
| 1615 | */ |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1616 | sleep = mddev->bitmap_info.daemon_sleep * 2; |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1617 | bitmap->daemon_lastrun -= sleep; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1618 | bitmap_daemon_work(mddev); |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1619 | bitmap->daemon_lastrun -= sleep; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1620 | bitmap_daemon_work(mddev); |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1621 | bitmap->daemon_lastrun -= sleep; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1622 | bitmap_daemon_work(mddev); |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1623 | bitmap_update_sb(bitmap); |
| 1624 | } |
| 1625 | |
| 1626 | /* |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1627 | * free memory that was allocated |
| 1628 | */ |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1629 | static void bitmap_free(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1630 | { |
| 1631 | unsigned long k, pages; |
| 1632 | struct bitmap_page *bp; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1633 | |
| 1634 | if (!bitmap) /* there was no bitmap */ |
| 1635 | return; |
| 1636 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1637 | /* release the bitmap file and kill the daemon */ |
| 1638 | bitmap_file_put(bitmap); |
| 1639 | |
| 1640 | bp = bitmap->bp; |
| 1641 | pages = bitmap->pages; |
| 1642 | |
| 1643 | /* free all allocated memory */ |
| 1644 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1645 | if (bp) /* deallocate the page memory */ |
| 1646 | for (k = 0; k < pages; k++) |
| 1647 | if (bp[k].map && !bp[k].hijacked) |
| 1648 | kfree(bp[k].map); |
| 1649 | kfree(bp); |
| 1650 | kfree(bitmap); |
| 1651 | } |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1652 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1653 | void bitmap_destroy(struct mddev *mddev) |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1654 | { |
| 1655 | struct bitmap *bitmap = mddev->bitmap; |
| 1656 | |
| 1657 | if (!bitmap) /* there was no bitmap */ |
| 1658 | return; |
| 1659 | |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1660 | mutex_lock(&mddev->bitmap_info.mutex); |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1661 | mddev->bitmap = NULL; /* disconnect from the md device */ |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1662 | mutex_unlock(&mddev->bitmap_info.mutex); |
NeilBrown | b15c2e5 | 2006-01-06 00:20:16 -0800 | [diff] [blame] | 1663 | if (mddev->thread) |
| 1664 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1665 | |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1666 | if (bitmap->sysfs_can_clear) |
| 1667 | sysfs_put(bitmap->sysfs_can_clear); |
| 1668 | |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1669 | bitmap_free(bitmap); |
| 1670 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1671 | |
| 1672 | /* |
| 1673 | * initialize the bitmap structure |
| 1674 | * if this returns an error, bitmap_destroy must be called to do clean up |
| 1675 | */ |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1676 | int bitmap_create(struct mddev *mddev) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1677 | { |
| 1678 | struct bitmap *bitmap; |
NeilBrown | 1f593903 | 2009-04-20 11:50:24 +1000 | [diff] [blame] | 1679 | sector_t blocks = mddev->resync_max_sectors; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1680 | unsigned long chunks; |
| 1681 | unsigned long pages; |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1682 | struct file *file = mddev->bitmap_info.file; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1683 | int err; |
NeilBrown | 5ff5aff | 2010-06-01 19:37:32 +1000 | [diff] [blame] | 1684 | struct sysfs_dirent *bm = NULL; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1685 | |
Alexey Dobriyan | 5f6e3c83 | 2006-10-11 01:22:26 -0700 | [diff] [blame] | 1686 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1687 | |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1688 | BUG_ON(file && mddev->bitmap_info.offset); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1689 | |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 1690 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1691 | if (!bitmap) |
| 1692 | return -ENOMEM; |
| 1693 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1694 | spin_lock_init(&bitmap->lock); |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1695 | atomic_set(&bitmap->pending_writes, 0); |
| 1696 | init_waitqueue_head(&bitmap->write_wait); |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1697 | init_waitqueue_head(&bitmap->overflow_wait); |
NeilBrown | e555190 | 2010-03-31 11:21:44 +1100 | [diff] [blame] | 1698 | init_waitqueue_head(&bitmap->behind_wait); |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1699 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1700 | bitmap->mddev = mddev; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1701 | |
NeilBrown | 5ff5aff | 2010-06-01 19:37:32 +1000 | [diff] [blame] | 1702 | if (mddev->kobj.sd) |
| 1703 | bm = sysfs_get_dirent(mddev->kobj.sd, NULL, "bitmap"); |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1704 | if (bm) { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 1705 | bitmap->sysfs_can_clear = sysfs_get_dirent(bm, NULL, "can_clear"); |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1706 | sysfs_put(bm); |
| 1707 | } else |
| 1708 | bitmap->sysfs_can_clear = NULL; |
| 1709 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1710 | bitmap->storage.file = file; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1711 | if (file) { |
| 1712 | get_file(file); |
NeilBrown | ae8fa28 | 2009-10-16 15:56:01 +1100 | [diff] [blame] | 1713 | /* As future accesses to this file will use bmap, |
| 1714 | * and bypass the page cache, we must sync the file |
| 1715 | * first. |
| 1716 | */ |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 1717 | vfs_fsync(file, 1); |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1718 | } |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1719 | /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 1720 | if (!mddev->bitmap_info.external) { |
| 1721 | /* |
| 1722 | * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is |
| 1723 | * instructing us to create a new on-disk bitmap instance. |
| 1724 | */ |
| 1725 | if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags)) |
| 1726 | err = bitmap_new_disk_sb(bitmap); |
| 1727 | else |
| 1728 | err = bitmap_read_sb(bitmap); |
| 1729 | } else { |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1730 | err = 0; |
| 1731 | if (mddev->bitmap_info.chunksize == 0 || |
| 1732 | mddev->bitmap_info.daemon_sleep == 0) |
| 1733 | /* chunksize and time_base need to be |
| 1734 | * set first. */ |
| 1735 | err = -EINVAL; |
| 1736 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1737 | if (err) |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1738 | goto error; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1739 | |
NeilBrown | 624ce4f | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1740 | bitmap->daemon_lastrun = jiffies; |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1741 | bitmap->chunkshift = (ffz(~mddev->bitmap_info.chunksize) |
| 1742 | - BITMAP_BLOCK_SHIFT); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1743 | |
NeilBrown | b16b1b6 | 2012-05-04 17:03:18 +1000 | [diff] [blame] | 1744 | chunks = (blocks + (1 << bitmap->chunkshift) - 1) >> |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1745 | bitmap->chunkshift; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1746 | pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1747 | |
| 1748 | BUG_ON(!pages); |
| 1749 | |
| 1750 | bitmap->chunks = chunks; |
| 1751 | bitmap->pages = pages; |
| 1752 | bitmap->missing_pages = pages; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1753 | |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 1754 | bitmap->bp = kzalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL); |
NeilBrown | 29d3247 | 2011-10-11 16:49:56 +1100 | [diff] [blame] | 1755 | |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1756 | err = -ENOMEM; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1757 | if (!bitmap->bp) |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1758 | goto error; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1759 | |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1760 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", |
| 1761 | pages, bmname(bitmap)); |
| 1762 | |
| 1763 | mddev->bitmap = bitmap; |
| 1764 | |
| 1765 | |
| 1766 | return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0; |
| 1767 | |
| 1768 | error: |
| 1769 | bitmap_free(bitmap); |
| 1770 | return err; |
| 1771 | } |
| 1772 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1773 | int bitmap_load(struct mddev *mddev) |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1774 | { |
| 1775 | int err = 0; |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1776 | sector_t start = 0; |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1777 | sector_t sector = 0; |
| 1778 | struct bitmap *bitmap = mddev->bitmap; |
| 1779 | |
| 1780 | if (!bitmap) |
| 1781 | goto out; |
| 1782 | |
| 1783 | /* Clear out old bitmap info first: Either there is none, or we |
| 1784 | * are resuming after someone else has possibly changed things, |
| 1785 | * so we should forget old cached info. |
| 1786 | * All chunks should be clean, but some might need_sync. |
| 1787 | */ |
| 1788 | while (sector < mddev->resync_max_sectors) { |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1789 | sector_t blocks; |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1790 | bitmap_start_sync(bitmap, sector, &blocks, 0); |
| 1791 | sector += blocks; |
| 1792 | } |
| 1793 | bitmap_close_sync(bitmap); |
| 1794 | |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1795 | if (mddev->degraded == 0 |
| 1796 | || bitmap->events_cleared == mddev->events) |
| 1797 | /* no need to keep dirty bits to optimise a |
| 1798 | * re-add of a missing device */ |
| 1799 | start = mddev->recovery_cp; |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1800 | |
NeilBrown | afbaa90 | 2012-04-12 16:05:06 +1000 | [diff] [blame] | 1801 | mutex_lock(&mddev->bitmap_info.mutex); |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1802 | err = bitmap_init_from_disk(bitmap, start); |
NeilBrown | afbaa90 | 2012-04-12 16:05:06 +1000 | [diff] [blame] | 1803 | mutex_unlock(&mddev->bitmap_info.mutex); |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1804 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1805 | if (err) |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1806 | goto out; |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1807 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); |
| 1808 | |
| 1809 | /* Kick recovery in case any bits were set */ |
| 1810 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1811 | |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1812 | mddev->thread->timeout = mddev->bitmap_info.daemon_sleep; |
NeilBrown | 9cd30fd | 2009-12-14 12:49:54 +1100 | [diff] [blame] | 1813 | md_wakeup_thread(mddev->thread); |
NeilBrown | b15c2e5 | 2006-01-06 00:20:16 -0800 | [diff] [blame] | 1814 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1815 | bitmap_update_sb(bitmap); |
| 1816 | |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1817 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
| 1818 | err = -EIO; |
| 1819 | out: |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1820 | return err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1821 | } |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1822 | EXPORT_SYMBOL_GPL(bitmap_load); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1823 | |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1824 | void bitmap_status(struct seq_file *seq, struct bitmap *bitmap) |
| 1825 | { |
| 1826 | unsigned long chunk_kb; |
| 1827 | unsigned long flags; |
| 1828 | |
| 1829 | if (!bitmap) |
| 1830 | return; |
| 1831 | |
| 1832 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1833 | chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10; |
| 1834 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
| 1835 | "%lu%s chunk", |
| 1836 | bitmap->pages - bitmap->missing_pages, |
| 1837 | bitmap->pages, |
| 1838 | (bitmap->pages - bitmap->missing_pages) |
| 1839 | << (PAGE_SHIFT - 10), |
| 1840 | chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize, |
| 1841 | chunk_kb ? "KB" : "B"); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1842 | if (bitmap->storage.file) { |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1843 | seq_printf(seq, ", file: "); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1844 | seq_path(seq, &bitmap->storage.file->f_path, " \t\n"); |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1845 | } |
| 1846 | |
| 1847 | seq_printf(seq, "\n"); |
| 1848 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1849 | } |
| 1850 | |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1851 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1852 | location_show(struct mddev *mddev, char *page) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1853 | { |
| 1854 | ssize_t len; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1855 | if (mddev->bitmap_info.file) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1856 | len = sprintf(page, "file"); |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1857 | else if (mddev->bitmap_info.offset) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1858 | len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1859 | else |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1860 | len = sprintf(page, "none"); |
| 1861 | len += sprintf(page+len, "\n"); |
| 1862 | return len; |
| 1863 | } |
| 1864 | |
| 1865 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1866 | location_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1867 | { |
| 1868 | |
| 1869 | if (mddev->pers) { |
| 1870 | if (!mddev->pers->quiesce) |
| 1871 | return -EBUSY; |
| 1872 | if (mddev->recovery || mddev->sync_thread) |
| 1873 | return -EBUSY; |
| 1874 | } |
| 1875 | |
| 1876 | if (mddev->bitmap || mddev->bitmap_info.file || |
| 1877 | mddev->bitmap_info.offset) { |
| 1878 | /* bitmap already configured. Only option is to clear it */ |
| 1879 | if (strncmp(buf, "none", 4) != 0) |
| 1880 | return -EBUSY; |
| 1881 | if (mddev->pers) { |
| 1882 | mddev->pers->quiesce(mddev, 1); |
| 1883 | bitmap_destroy(mddev); |
| 1884 | mddev->pers->quiesce(mddev, 0); |
| 1885 | } |
| 1886 | mddev->bitmap_info.offset = 0; |
| 1887 | if (mddev->bitmap_info.file) { |
| 1888 | struct file *f = mddev->bitmap_info.file; |
| 1889 | mddev->bitmap_info.file = NULL; |
| 1890 | restore_bitmap_write_access(f); |
| 1891 | fput(f); |
| 1892 | } |
| 1893 | } else { |
| 1894 | /* No bitmap, OK to set a location */ |
| 1895 | long long offset; |
| 1896 | if (strncmp(buf, "none", 4) == 0) |
| 1897 | /* nothing to be done */; |
| 1898 | else if (strncmp(buf, "file:", 5) == 0) { |
| 1899 | /* Not supported yet */ |
| 1900 | return -EINVAL; |
| 1901 | } else { |
| 1902 | int rv; |
| 1903 | if (buf[0] == '+') |
| 1904 | rv = strict_strtoll(buf+1, 10, &offset); |
| 1905 | else |
| 1906 | rv = strict_strtoll(buf, 10, &offset); |
| 1907 | if (rv) |
| 1908 | return rv; |
| 1909 | if (offset == 0) |
| 1910 | return -EINVAL; |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1911 | if (mddev->bitmap_info.external == 0 && |
| 1912 | mddev->major_version == 0 && |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1913 | offset != mddev->bitmap_info.default_offset) |
| 1914 | return -EINVAL; |
| 1915 | mddev->bitmap_info.offset = offset; |
| 1916 | if (mddev->pers) { |
| 1917 | mddev->pers->quiesce(mddev, 1); |
| 1918 | rv = bitmap_create(mddev); |
NeilBrown | 4474ca4 | 2012-03-19 12:46:37 +1100 | [diff] [blame] | 1919 | if (!rv) |
| 1920 | rv = bitmap_load(mddev); |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1921 | if (rv) { |
| 1922 | bitmap_destroy(mddev); |
| 1923 | mddev->bitmap_info.offset = 0; |
| 1924 | } |
| 1925 | mddev->pers->quiesce(mddev, 0); |
| 1926 | if (rv) |
| 1927 | return rv; |
| 1928 | } |
| 1929 | } |
| 1930 | } |
| 1931 | if (!mddev->external) { |
| 1932 | /* Ensure new bitmap info is stored in |
| 1933 | * metadata promptly. |
| 1934 | */ |
| 1935 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| 1936 | md_wakeup_thread(mddev->thread); |
| 1937 | } |
| 1938 | return len; |
| 1939 | } |
| 1940 | |
| 1941 | static struct md_sysfs_entry bitmap_location = |
| 1942 | __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); |
| 1943 | |
NeilBrown | 6409bb0 | 2012-05-22 13:55:07 +1000 | [diff] [blame] | 1944 | /* 'bitmap/space' is the space available at 'location' for the |
| 1945 | * bitmap. This allows the kernel to know when it is safe to |
| 1946 | * resize the bitmap to match a resized array. |
| 1947 | */ |
| 1948 | static ssize_t |
| 1949 | space_show(struct mddev *mddev, char *page) |
| 1950 | { |
| 1951 | return sprintf(page, "%lu\n", mddev->bitmap_info.space); |
| 1952 | } |
| 1953 | |
| 1954 | static ssize_t |
| 1955 | space_store(struct mddev *mddev, const char *buf, size_t len) |
| 1956 | { |
| 1957 | unsigned long sectors; |
| 1958 | int rv; |
| 1959 | |
| 1960 | rv = kstrtoul(buf, 10, §ors); |
| 1961 | if (rv) |
| 1962 | return rv; |
| 1963 | |
| 1964 | if (sectors == 0) |
| 1965 | return -EINVAL; |
| 1966 | |
| 1967 | if (mddev->bitmap && |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame^] | 1968 | sectors < ((mddev->bitmap->storage.file_pages - 1) |
| 1969 | * PAGE_SIZE |
| 1970 | + mddev->bitmap->storage.last_page_size + 511) >> 9) |
NeilBrown | 6409bb0 | 2012-05-22 13:55:07 +1000 | [diff] [blame] | 1971 | return -EFBIG; /* Bitmap is too big for this small space */ |
| 1972 | |
| 1973 | /* could make sure it isn't too big, but that isn't really |
| 1974 | * needed - user-space should be careful. |
| 1975 | */ |
| 1976 | mddev->bitmap_info.space = sectors; |
| 1977 | return len; |
| 1978 | } |
| 1979 | |
| 1980 | static struct md_sysfs_entry bitmap_space = |
| 1981 | __ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store); |
| 1982 | |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1983 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1984 | timeout_show(struct mddev *mddev, char *page) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1985 | { |
| 1986 | ssize_t len; |
| 1987 | unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; |
| 1988 | unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1989 | |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1990 | len = sprintf(page, "%lu", secs); |
| 1991 | if (jifs) |
| 1992 | len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); |
| 1993 | len += sprintf(page+len, "\n"); |
| 1994 | return len; |
| 1995 | } |
| 1996 | |
| 1997 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1998 | timeout_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1999 | { |
| 2000 | /* timeout can be set at any time */ |
| 2001 | unsigned long timeout; |
| 2002 | int rv = strict_strtoul_scaled(buf, &timeout, 4); |
| 2003 | if (rv) |
| 2004 | return rv; |
| 2005 | |
| 2006 | /* just to make sure we don't overflow... */ |
| 2007 | if (timeout >= LONG_MAX / HZ) |
| 2008 | return -EINVAL; |
| 2009 | |
| 2010 | timeout = timeout * HZ / 10000; |
| 2011 | |
| 2012 | if (timeout >= MAX_SCHEDULE_TIMEOUT) |
| 2013 | timeout = MAX_SCHEDULE_TIMEOUT-1; |
| 2014 | if (timeout < 1) |
| 2015 | timeout = 1; |
| 2016 | mddev->bitmap_info.daemon_sleep = timeout; |
| 2017 | if (mddev->thread) { |
| 2018 | /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then |
| 2019 | * the bitmap is all clean and we don't need to |
| 2020 | * adjust the timeout right now |
| 2021 | */ |
| 2022 | if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) { |
| 2023 | mddev->thread->timeout = timeout; |
| 2024 | md_wakeup_thread(mddev->thread); |
| 2025 | } |
| 2026 | } |
| 2027 | return len; |
| 2028 | } |
| 2029 | |
| 2030 | static struct md_sysfs_entry bitmap_timeout = |
| 2031 | __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); |
| 2032 | |
| 2033 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2034 | backlog_show(struct mddev *mddev, char *page) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2035 | { |
| 2036 | return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); |
| 2037 | } |
| 2038 | |
| 2039 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2040 | backlog_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2041 | { |
| 2042 | unsigned long backlog; |
| 2043 | int rv = strict_strtoul(buf, 10, &backlog); |
| 2044 | if (rv) |
| 2045 | return rv; |
| 2046 | if (backlog > COUNTER_MAX) |
| 2047 | return -EINVAL; |
| 2048 | mddev->bitmap_info.max_write_behind = backlog; |
| 2049 | return len; |
| 2050 | } |
| 2051 | |
| 2052 | static struct md_sysfs_entry bitmap_backlog = |
| 2053 | __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); |
| 2054 | |
| 2055 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2056 | chunksize_show(struct mddev *mddev, char *page) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2057 | { |
| 2058 | return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); |
| 2059 | } |
| 2060 | |
| 2061 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2062 | chunksize_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2063 | { |
| 2064 | /* Can only be changed when no bitmap is active */ |
| 2065 | int rv; |
| 2066 | unsigned long csize; |
| 2067 | if (mddev->bitmap) |
| 2068 | return -EBUSY; |
| 2069 | rv = strict_strtoul(buf, 10, &csize); |
| 2070 | if (rv) |
| 2071 | return rv; |
| 2072 | if (csize < 512 || |
| 2073 | !is_power_of_2(csize)) |
| 2074 | return -EINVAL; |
| 2075 | mddev->bitmap_info.chunksize = csize; |
| 2076 | return len; |
| 2077 | } |
| 2078 | |
| 2079 | static struct md_sysfs_entry bitmap_chunksize = |
| 2080 | __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); |
| 2081 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2082 | static ssize_t metadata_show(struct mddev *mddev, char *page) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2083 | { |
| 2084 | return sprintf(page, "%s\n", (mddev->bitmap_info.external |
| 2085 | ? "external" : "internal")); |
| 2086 | } |
| 2087 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2088 | static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2089 | { |
| 2090 | if (mddev->bitmap || |
| 2091 | mddev->bitmap_info.file || |
| 2092 | mddev->bitmap_info.offset) |
| 2093 | return -EBUSY; |
| 2094 | if (strncmp(buf, "external", 8) == 0) |
| 2095 | mddev->bitmap_info.external = 1; |
| 2096 | else if (strncmp(buf, "internal", 8) == 0) |
| 2097 | mddev->bitmap_info.external = 0; |
| 2098 | else |
| 2099 | return -EINVAL; |
| 2100 | return len; |
| 2101 | } |
| 2102 | |
| 2103 | static struct md_sysfs_entry bitmap_metadata = |
| 2104 | __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
| 2105 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2106 | static ssize_t can_clear_show(struct mddev *mddev, char *page) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2107 | { |
| 2108 | int len; |
| 2109 | if (mddev->bitmap) |
| 2110 | len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? |
| 2111 | "false" : "true")); |
| 2112 | else |
| 2113 | len = sprintf(page, "\n"); |
| 2114 | return len; |
| 2115 | } |
| 2116 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2117 | static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2118 | { |
| 2119 | if (mddev->bitmap == NULL) |
| 2120 | return -ENOENT; |
| 2121 | if (strncmp(buf, "false", 5) == 0) |
| 2122 | mddev->bitmap->need_sync = 1; |
| 2123 | else if (strncmp(buf, "true", 4) == 0) { |
| 2124 | if (mddev->degraded) |
| 2125 | return -EBUSY; |
| 2126 | mddev->bitmap->need_sync = 0; |
| 2127 | } else |
| 2128 | return -EINVAL; |
| 2129 | return len; |
| 2130 | } |
| 2131 | |
| 2132 | static struct md_sysfs_entry bitmap_can_clear = |
| 2133 | __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); |
| 2134 | |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2135 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2136 | behind_writes_used_show(struct mddev *mddev, char *page) |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2137 | { |
| 2138 | if (mddev->bitmap == NULL) |
| 2139 | return sprintf(page, "0\n"); |
| 2140 | return sprintf(page, "%lu\n", |
| 2141 | mddev->bitmap->behind_writes_used); |
| 2142 | } |
| 2143 | |
| 2144 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2145 | behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len) |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2146 | { |
| 2147 | if (mddev->bitmap) |
| 2148 | mddev->bitmap->behind_writes_used = 0; |
| 2149 | return len; |
| 2150 | } |
| 2151 | |
| 2152 | static struct md_sysfs_entry max_backlog_used = |
| 2153 | __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, |
| 2154 | behind_writes_used_show, behind_writes_used_reset); |
| 2155 | |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2156 | static struct attribute *md_bitmap_attrs[] = { |
| 2157 | &bitmap_location.attr, |
NeilBrown | 6409bb0 | 2012-05-22 13:55:07 +1000 | [diff] [blame] | 2158 | &bitmap_space.attr, |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2159 | &bitmap_timeout.attr, |
| 2160 | &bitmap_backlog.attr, |
| 2161 | &bitmap_chunksize.attr, |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2162 | &bitmap_metadata.attr, |
| 2163 | &bitmap_can_clear.attr, |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2164 | &max_backlog_used.attr, |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2165 | NULL |
| 2166 | }; |
| 2167 | struct attribute_group md_bitmap_group = { |
| 2168 | .name = "bitmap", |
| 2169 | .attrs = md_bitmap_attrs, |
| 2170 | }; |
| 2171 | |