ceph: redirty page when writepage_nounlock() skips unwritable page

Ceph needs to flush dirty page in the order in which in which snap
context they belong to. Dirty pages belong to older snap context
should be flushed earlier. if writepage_nounlock() can not flush a
page, it should redirty the page.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 96f83a417944..8fde3b59e3a5 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -551,8 +551,9 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
                 dout("writepage %p page %p snapc %p not writeable - noop\n",
                      inode, page, snapc);
                 /* we should only noop if called by kswapd */
-                WARN_ON((current->flags & PF_MEMALLOC) == 0);
+                WARN_ON(!(current->flags & PF_MEMALLOC));
                 ceph_put_snap_context(oldest);
+                redirty_page_for_writepage(wbc, page);
                 goto out;
         }
         ceph_put_snap_context(oldest);