From: Josef Bacik <josef@toxicpanda.com>
Date: Fri, 28 Sep 2018 07:18:03 -0400
Subject: btrfs: assert on non-empty delayed iputs
Git-commit: e187831e1875b2754a3ba3c683bd277d4a5f7be8
Patch-mainline: v4.20-rc1
References: bsc##1165949

I ran into an issue where there was some reference being held on an
inode that I couldn't track.  This assert wasn't triggered, but it at
least rules out we're doing something stupid.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Acked-by: Nikolay Borisov <nborisov@suse.com>
---
 fs/btrfs/disk-io.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 27f6a3348f94..b0ab41da91d1 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3976,6 +3976,7 @@ void close_ctree(struct btrfs_fs_info *fs_info)
 	kthread_stop(fs_info->transaction_kthread);
 	kthread_stop(fs_info->cleaner_kthread);
 
+	ASSERT(list_empty(&fs_info->delayed_iputs));
 	set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags);
 
 	btrfs_free_qgroup_config(fs_info);