From: Miklos Szeredi <mszeredi@xxxxxxx>
If ->writepage() tries to write back a page whose copy is still in flight,
then just skip by calling redirty_page_for_writepage().
This is OK, since now ->writepage() should never be called for data
integrity sync.
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
---
fs/fuse/file.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index f8ff019..135360e 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1591,6 +1591,18 @@ static int fuse_writepage(struct page *page, struct writeback_control *wbc)
{
int err;
+ if (fuse_page_is_writeback(page->mapping->host, page->index)) {
+ /*
+ * ->writepages() should be called for sync() and friends. We
+ * should only get here on direct reclaim and then we are
+ * allowed to skip a page which is already in flight
+ */
+ WARN_ON(wbc->sync_mode == WB_SYNC_ALL);
+
+ redirty_page_for_writepage(wbc, page);
+ return 0;
+ }
+
err = fuse_writepage_locked(page);
unlock_page(page);
--
1.8.1.4
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