3.16-stable review patch. If anyone has any objections, please let me know.
------------------
From: Filipe Manana <fdman...@suse.com>
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 <fdman...@suse.com>
Signed-off-by: Chris Mason <c...@fb.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
fs/btrfs/backref.c | 3 +++
1 file changed, 3 insertions(+)
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1000,8 +1000,11 @@ 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;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
