[PATCH 5/7] iomap: mark ->iomap_end as optional

[Christoph Hellwig]

No need to implement it for read-only mappings.

Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 fs/iomap.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/iomap.c b/fs/iomap.c
index d9d1f50..0342254 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -84,8 +84,11 @@ iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags,
 	 * Now the data has been copied, commit the range we've copied.  This
 	 * should not fail unless the filesystem has had a fatal error.
 	 */
-	ret = ops->iomap_end(inode, pos, length, written > 0 ? written : 0,
-			flags, &iomap);
+	if (ops->iomap_end) {
+		ret = ops->iomap_end(inode, pos, length,
+				     written > 0 ? written : 0,
+				     flags, &iomap);
+	}
 
 	return written ? written : ret;
 }
-- 
2.1.4