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authorMiklos Szeredi <mszeredi@suse.cz>2013-10-01 16:44:53 +0200
committerMiklos Szeredi <mszeredi@suse.cz>2013-10-01 16:44:53 +0200
commitff17be0864777fe0dfb0a477868a8cb95c1ff90e (patch)
treee45109ae17eee26119d3b4d51f5282067aef09b0 /fs/fuse
parent8b284dc47291daf72fe300e1138a2e7ed56f38ab (diff)
downloadop-kernel-dev-ff17be0864777fe0dfb0a477868a8cb95c1ff90e.zip
op-kernel-dev-ff17be0864777fe0dfb0a477868a8cb95c1ff90e.tar.gz
fuse: writepage: skip already in flight
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@suse.cz>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/file.c12
1 files changed, 12 insertions, 0 deletions
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);
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