aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJosef Bacik <jbacik@fusionio.com>2013-04-05 20:50:09 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-25 21:23:49 -0700
commit7a860c4dfb8ebaf777a7df185df4436ea343189a (patch)
tree8e96cc305860ccdfde5371e1bec3edae2014e5d6
parent856398d852436111d5cdbf30374f576671903998 (diff)
downloadlinux-linaro-stable-7a860c4dfb8ebaf777a7df185df4436ea343189a.tar.gz
Btrfs: make sure nbytes are right after log replay
commit 4bc4bee4595662d8bff92180d5c32e3313a704b0 upstream. While trying to track down a tree log replay bug I noticed that fsck was always complaining about nbytes not being right for our fsynced file. That is because the new fsync stuff doesn't wait for ordered extents to complete, so the inodes nbytes are not necessarily updated properly when we log it. So to fix this we need to set nbytes to whatever it is on the inode that is on disk, so when we replay the extents we can just add the bytes that are being added as we replay the extent. This makes it work for the case that we have the wrong nbytes or the case that we logged everything and nbytes is actually correct. With this I'm no longer getting nbytes errors out of btrfsck. Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com> Signed-off-by: Lingzhu Xiang <lxiang@redhat.com> Reviewed-by: CAI Qian <caiqian@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/btrfs/tree-log.c48
1 files changed, 42 insertions, 6 deletions
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index faf7d0bc0a01..88dec16d0b15 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -315,6 +315,7 @@ static noinline int overwrite_item(struct btrfs_trans_handle *trans,
unsigned long src_ptr;
unsigned long dst_ptr;
int overwrite_root = 0;
+ bool inode_item = key->type == BTRFS_INODE_ITEM_KEY;
if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID)
overwrite_root = 1;
@@ -324,6 +325,9 @@ static noinline int overwrite_item(struct btrfs_trans_handle *trans,
/* look for the key in the destination tree */
ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
+ if (ret < 0)
+ return ret;
+
if (ret == 0) {
char *src_copy;
char *dst_copy;
@@ -365,6 +369,30 @@ static noinline int overwrite_item(struct btrfs_trans_handle *trans,
return 0;
}
+ /*
+ * We need to load the old nbytes into the inode so when we
+ * replay the extents we've logged we get the right nbytes.
+ */
+ if (inode_item) {
+ struct btrfs_inode_item *item;
+ u64 nbytes;
+
+ item = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_inode_item);
+ nbytes = btrfs_inode_nbytes(path->nodes[0], item);
+ item = btrfs_item_ptr(eb, slot,
+ struct btrfs_inode_item);
+ btrfs_set_inode_nbytes(eb, item, nbytes);
+ }
+ } else if (inode_item) {
+ struct btrfs_inode_item *item;
+
+ /*
+ * New inode, set nbytes to 0 so that the nbytes comes out
+ * properly when we replay the extents.
+ */
+ item = btrfs_item_ptr(eb, slot, struct btrfs_inode_item);
+ btrfs_set_inode_nbytes(eb, item, 0);
}
insert:
btrfs_release_path(path);
@@ -487,7 +515,7 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
u64 extent_end;
u64 alloc_hint;
u64 start = key->offset;
- u64 saved_nbytes;
+ u64 nbytes = 0;
struct btrfs_file_extent_item *item;
struct inode *inode = NULL;
unsigned long size;
@@ -497,10 +525,19 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
found_type = btrfs_file_extent_type(eb, item);
if (found_type == BTRFS_FILE_EXTENT_REG ||
- found_type == BTRFS_FILE_EXTENT_PREALLOC)
- extent_end = start + btrfs_file_extent_num_bytes(eb, item);
- else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
+ found_type == BTRFS_FILE_EXTENT_PREALLOC) {
+ nbytes = btrfs_file_extent_num_bytes(eb, item);
+ extent_end = start + nbytes;
+
+ /*
+ * We don't add to the inodes nbytes if we are prealloc or a
+ * hole.
+ */
+ if (btrfs_file_extent_disk_bytenr(eb, item) == 0)
+ nbytes = 0;
+ } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
size = btrfs_file_extent_inline_len(eb, item);
+ nbytes = btrfs_file_extent_ram_bytes(eb, item);
extent_end = (start + size + mask) & ~mask;
} else {
ret = 0;
@@ -549,7 +586,6 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
}
btrfs_release_path(path);
- saved_nbytes = inode_get_bytes(inode);
/* drop any overlapping extents */
ret = btrfs_drop_extents(trans, inode, start, extent_end,
&alloc_hint, 1);
@@ -637,7 +673,7 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
BUG_ON(ret);
}
- inode_set_bytes(inode, saved_nbytes);
+ inode_add_bytes(inode, nbytes);
btrfs_update_inode(trans, root, inode);
out:
if (inode)