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| author | Josef Bacik <jbacik@fusionio.com> | 2013-07-15 12:41:42 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-04 16:50:52 +0800 |
| commit | 14e86565899d123a994d974560624b617d855ca8 (patch) | |
| tree | 44c6a6ff5f39bef7099265a041cb89c1587e98ff /fs | |
| parent | db60e49ae570b342d63f0bbda4d35b85a392da25 (diff) | |
| download | linux-3.10-14e86565899d123a994d974560624b617d855ca8.tar.gz linux-3.10-14e86565899d123a994d974560624b617d855ca8.tar.bz2 linux-3.10-14e86565899d123a994d974560624b617d855ca8.zip | |
Btrfs: fix lock leak when resuming snapshot deletion
commit fec386ac1428f9c0e672df952cbca5cebd4e4e2f upstream.
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,
Reported-by: Alex Lyakas <alex.btrfs@zadarastorage.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -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 df472ab1b5a..3915155ba27 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -7355,6 +7355,7 @@ 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, @@ -7370,6 +7371,7 @@ 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--; } |