[PATCH 1/2] btrfs-progs: check: run delayed refs after writing out dirty block groups

[jeffm@suse.com]

From: Jeff Mahoney <jeffm@suse.com>

When repairing the extent tree, it's possible for delayed extents to
be created when running btrfs_write_dirty_block_groups.  We run
delayed refs one last time in the kernel but that is missing in
the userspace tools.

That results in delayed refs getting dropped on the floor, the extent
records not getting created, and in the next tranaction, when the
extent tree is CoW'd again, we hit the BUG_ON when we can't find
the extent record.

We can fix this by running the delayed refs after writing out the
dirty block groups.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---
 transaction.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/transaction.c b/transaction.c
index e756db33..2f19e9c8 100644
--- a/transaction.c
+++ b/transaction.c
@@ -194,6 +194,8 @@ commit_tree:
 	ret = btrfs_run_delayed_refs(trans, -1);
 	BUG_ON(ret);
 	btrfs_write_dirty_block_groups(trans);
+	ret = btrfs_run_delayed_refs(trans, -1);
+	BUG_ON(ret);
 	__commit_transaction(trans, root);
 	if (ret < 0)
 		goto out;
-- 
2.16.4