[PATCH wip-fscrypt] ceph: reset "err = 0" after iov_get_pages_alloc in ceph_netfs_issue_read

[Jeff Layton <jlayton@kernel.org>]

Currently, when we call ceph_netfs_issue_read for an encrypted inode,
we'll call iov_iter_get_pages_alloc and assign its result to "err".
Later we'll end up inappropriately calling netfs_subreq_terminated with
that value after submitting the request. Ensure we reset "err = 0;"
after calling iov_iter_get_pages_alloc.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/ceph/addr.c | 1 +
 1 file changed, 1 insertion(+)

Probably this should get squashed into the patch that adds fscrypt
support to buffered reads.

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index c713b5491012..64facef79883 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -376,6 +376,7 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
 		/* should always give us a page-aligned read */
 		WARN_ON_ONCE(page_off);
 		len = err;
+		err = 0;
 
 		osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
 	} else {
-- 
2.36.1