[PATCH v6 6/7] Revert "ceph: SetPageError() for writeback pages if writepages fails"

[Jeff Layton <jlayton@redhat.com>]

This reverts commit b109eec6f4332bd517e2f41e207037c4b9065094.

If I'm filling up a filesystem with this sort of command:

    $ dd if=/dev/urandom of=/mnt/cephfs/fillfile bs=2M oflag=sync

...then I'll eventually get back EIO on a write. Further calls
will give us ENOSPC.

I'm not sure what prompted this change, but I don't think it's what we
want to do. If writepages failed, we will have already set the mapping
error appropriately, and that's what gets reported by fsync() or
close().

__filemap_fdatawait_range however, does this:

	wait_on_page_writeback(page);
	if (TestClearPageError(page))
		ret = -EIO;

...and that -EIO ends up trumping the mapping's error if one exists.

When writepages fails, we only want to set the error in the mapping,
and not flag the individual pages.

Reviewed-by: "Yan, Zheng” <zyan@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
---
 fs/ceph/addr.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 7e3fae334620..6cdf94459ac4 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -703,9 +703,6 @@ static void writepages_finish(struct ceph_osd_request *req)
 				clear_bdi_congested(&fsc->backing_dev_info,
 						    BLK_RW_ASYNC);
 
-			if (rc < 0)
-				SetPageError(page);
-
 			ceph_put_snap_context(page_snap_context(page));
 			page->private = 0;
 			ClearPagePrivate(page);
-- 
2.9.3