leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Btrfs: skip locking if searching the commit root in csum lookup

Browse Source 
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>
This commit is contained in:
Josef Bacik 2011-09-11 10:52:24 -04:00 committed by Chris Mason
parent e0b6d65be5
commit ddf23b3fc6
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/btrfs/file-item.c
View File

@ -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)