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authorJosef Bacik <josef@redhat.com>2011-09-11 10:52:24 -0400
committerChris Mason <chris.mason@oracle.com>2011-09-11 10:52:24 -0400
commitddf23b3fc6850bd4654d51ec9457fe7c77cde51e (patch)
tree9f5fe8f71a2793b5f651ef6c535d9116b5094348 /fs/btrfs/file-item.c
parente0b6d65be57fb37ca67b04ce8964546a74d2125c (diff)
downloadop-kernel-dev-ddf23b3fc6850bd4654d51ec9457fe7c77cde51e.zip
op-kernel-dev-ddf23b3fc6850bd4654d51ec9457fe7c77cde51e.tar.gz
Btrfs: skip locking if searching the commit root in csum lookup
It's not enough to just search the commit root, since we could be cow'ing the very block we need to search through, which would mean that its locked and we'll still deadlock. So use path->skip_locking as well. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/file-item.c')
-rw-r--r--fs/btrfs/file-item.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index b910694..a1cb782 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -183,8 +183,10 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
* read from the commit root and sidestep a nasty deadlock
* between reading the free space cache and updating the csum tree.
*/
- if (btrfs_is_free_space_inode(root, inode))
+ if (btrfs_is_free_space_inode(root, inode)) {
path->search_commit_root = 1;
+ path->skip_locking = 1;
+ }
disk_bytenr = (u64)bio->bi_sector << 9;
if (dio)
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