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| author | Josef Bacik <jbacik@fusionio.com> | 2013-07-15 12:41:42 -0400 |
|---|---|---|
| committer | Josef Bacik <jbacik@fusionio.com> | 2013-07-19 15:07:11 -0400 |
| commit | fec386ac1428f9c0e672df952cbca5cebd4e4e2f (patch) | |
| tree | 3dbfcb86647729564322d967bc7f00b523123e8d | |
| parent | 3c8f24225752fba30f7265202ce6092318ed9fac (diff) | |
| download | linux-fec386ac1428f9c0e672df952cbca5cebd4e4e2f.tar.bz2 | |
Btrfs: fix lock leak when resuming snapshot deletion
We aren't setting path->locks[level] when we resume a snapshot deletion which
means we won't unlock the buffer when we free the path. This causes deadlocks
if we happen to re-allocate the block before we've evicted the extent buffer
from cache. Thanks,
Cc: stable@vger.kernel.org
Reported-by: Alex Lyakas <alex.btrfs@zadarastorage.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
| -rw-r--r-- | fs/btrfs/extent-tree.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index a429704dd95f..e814b1312511 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -7523,6 +7523,7 @@ int btrfs_drop_snapshot(struct btrfs_root *root, while (1) { btrfs_tree_lock(path->nodes[level]); btrfs_set_lock_blocking(path->nodes[level]); + path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING; ret = btrfs_lookup_extent_info(trans, root, path->nodes[level]->start, @@ -7538,6 +7539,7 @@ int btrfs_drop_snapshot(struct btrfs_root *root, break; btrfs_tree_unlock(path->nodes[level]); + path->locks[level] = 0; WARN_ON(wc->refs[level] != 1); level--; } |