Btrfs: fix regression in scrub path resolving

In commit 4692cf58 we introduced new backref walking code for btrfs. This
assumes we're searching live roots, which requires a transaction context.
While scrubbing, however, we must not join a transaction because this could
deadlock with the commit path. Additionally, what scrub really wants to do
is resolving a logical address in the commit root it's currently checking.

This patch adds support for logical to path resolving on commit roots and
makes scrub use that.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index abc0fbffa510..b9b84cdfc359 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -352,8 +352,8 @@ static void scrub_print_warning(const char *errstr, struct scrub_bio *sbio,
                 } while (ret != 1);
         } else {
                 swarn.path = path;
-                iterate_extent_inodes(fs_info, path, found_key.objectid,
-                                        extent_item_pos,
+                iterate_extent_inodes(fs_info, found_key.objectid,
+                                        extent_item_pos, 1,
                                         scrub_print_warning_inode, &swarn);
         }