diff options
| author | Filipe Manana <fdmanana@suse.com> | 2014-07-02 20:07:54 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-05 16:34:16 -0700 |
| commit | 8a6de3b6c9dd8b1fb52b40e4aa4d6c8bd9ce0a26 (patch) | |
| tree | 67b542670ebb5109628105e7751e64bc0ef0e48a /fs/btrfs | |
| parent | dcc48de73f9a8d7c85f27579ba9cc11000910cd7 (diff) | |
Btrfs: read lock extent buffer while walking backrefs
commit 6f7ff6d7832c6be13e8c95598884dbc40ad69fb7 upstream.
Before processing the extent buffer, acquire a read lock on it, so
that we're safe against concurrent updates on the extent buffer.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/backref.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index d9328a963983..6244f9cf8ae3 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -984,8 +984,11 @@ again: ret = -EIO; goto out; } + btrfs_tree_read_lock(eb); + btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK); ret = find_extent_in_eb(eb, bytenr, *extent_item_pos, &eie); + btrfs_tree_read_unlock_blocking(eb); free_extent_buffer(eb); if (ret < 0) goto out; |