[PATCH] btrfs: Add assert or condition

[Lizhi Xu]

When the value of fsync_skip_inode_lock is true, i_mmap_lock is used,
so add it or condition in the ASSERT. 

Reported-and-tested-by: syzbot+4704b3cc972bd76024f1@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=4704b3cc972bd76024f1
Signed-off-by: Lizhi Xu <lizhi.xu@xxxxxxxxxxxxx>
---
 fs/btrfs/ordered-data.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index 82a68394a89c..d0187e1fb941 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -1015,7 +1015,8 @@ void btrfs_get_ordered_extents_for_logging(struct btrfs_inode *inode,
 {
 	struct rb_node *n;
 
-	ASSERT(inode_is_locked(&inode->vfs_inode));
+	ASSERT(inode_is_locked(&inode->vfs_inode) ||
+	       rwsem_is_locked(&inode->i_mmap_lock));
 
 	spin_lock_irq(&inode->ordered_tree_lock);
 	for (n = rb_first(&inode->ordered_tree); n; n = rb_next(n)) {
-- 
2.43.0