Instead of checking i_private_list directly use appropriate wrapper
inode_has_buffers(). Also delete stale comment.

Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/buffer.c     | 1 +
 fs/ext4/inode.c | 5 +----
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 22b43642ba57..1bc0f22f3cc2 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -524,6 +524,7 @@ int inode_has_buffers(struct inode *inode)
 {
 	return !list_empty(&inode->i_data.i_private_list);
 }
+EXPORT_SYMBOL_GPL(inode_has_buffers);
 
 /*
  * osync is designed to support O_SYNC io.  It waits synchronously for
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index c2692b9c7123..6f892abef003 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1422,9 +1422,6 @@ static int write_end_fn(handle_t *handle, struct inode *inode,
 /*
  * We need to pick up the new inode size which generic_commit_write gave us
  * `iocb` can be NULL - eg, when called from page_symlink().
- *
- * ext4 never places buffers on inode->i_mapping->i_private_list.  metadata
- * buffers are managed internally.
  */
 static int ext4_write_end(const struct kiocb *iocb,
 			  struct address_space *mapping,
@@ -3439,7 +3436,7 @@ static bool ext4_inode_datasync_dirty(struct inode *inode)
 	}
 
 	/* Any metadata buffers to write? */
-	if (!list_empty(&inode->i_mapping->i_private_list))
+	if (inode_has_buffers(inode))
 		return true;
 	return inode_state_read_once(inode) & I_DIRTY_DATASYNC;
 }
-- 
2.51.0