ocfs2: Only bug out in direct io write for reflinked extent.

In ocfs2_direct_IO_get_blocks, we only need to bug out
in case of we are going to write a recounted extent rec.

What a silly bug introduced by me!

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Cc: stable@kernel.org

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 7e9df11260f4..4c2a6d282c4d 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -577,8 +577,9 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
                 goto bail;
         }
 
-        /* We should already CoW the refcounted extent. */
-        BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
+        /* We should already CoW the refcounted extent in case of create. */
+        BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED));
+
         /*
          * get_more_blocks() expects us to describe a hole by clearing
          * the mapped bit on bh_result().