[PATCH 01/15] FOLD: iomap: make the discard_page method optional

Christoph Hellwig
2019-07-01T21:54:58Z

For file system that do not support delayed allocations there is
nothing to discard here, so don't require them to implement the
method.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/iomap.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/iomap.c b/fs/iomap.c
index 72ba3962acf3..ebfff663b2a9 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -2545,7 +2545,8 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
*/
if (unlikely(error)) {
if (!count) {
- wpc->ops->discard_page(page);
+ if (wpc->ops->discard_page)
+ wpc->ops->discard_page(page);
ClearPageUptodate(page);
unlock_page(page);
goto done;
--
2.20.1