diff options
| author | Filipe Manana <fdmanana@suse.com> | 2014-07-02 20:07:54 +0100 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-09-17 15:12:20 +0200 |
| commit | 308d30d163995b77b264982dd463ae05aedeb0f9 (patch) | |
| tree | cda0dac9fffd3c8cf567a6809beaf2846f6ef998 /fs | |
| parent | e2e8bf61f04c4560db4bbb1cbc87334b824d892b (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: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'fs')
| -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 715cfa42e182..53039de1495d 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -954,8 +954,11 @@ 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; |