diff options
| author | Yan, Zheng <zheng.yan@oracle.com> | 2010-02-04 08:46:56 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-13 13:20:10 -0700 |
| commit | 85d0fbf78459afd67f19052fca86e804db8e1251 (patch) | |
| tree | aebbd467fa766daed7a679ae27abcf6a96aa7ee8 /fs | |
| parent | 95ec1a915f8c7730a5dffdd604c2b0498be15200 (diff) | |
Btrfs: fix race between allocate and release extent buffer.
commit f044ba7835b84e69c68b620ca8fa27e5ef67759d upstream.
Increase extent buffer's reference count while holding the lock.
Otherwise it can race with try_release_extent_buffer.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Acked-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/extent_io.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 96577e8bf9f..b177ed31961 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -3165,10 +3165,9 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, spin_unlock(&tree->buffer_lock); goto free_eb; } - spin_unlock(&tree->buffer_lock); - /* add one reference for the tree */ atomic_inc(&eb->refs); + spin_unlock(&tree->buffer_lock); return eb; free_eb: |