btrfs has it's own per-root inode list for snapshot uses, and it has a
sanity check to make sure we're not overwriting a live inode when we add
one to the root's xarray. Change this to check the refcount to validate
it's not a live inode.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/btrfs/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index eb9496342346..69aab55648b9 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3860,7 +3860,7 @@ static int btrfs_add_inode_to_root(struct btrfs_inode *inode, bool prealloc)
 		ASSERT(ret != -ENOMEM);
 		return ret;
 	} else if (existing) {
-		WARN_ON(!(existing->vfs_inode.i_state & (I_WILL_FREE | I_FREEING)));
+		WARN_ON(!icount_read(&existing->vfs_inode));
 	}
 
 	return 0;
-- 
2.49.0