From: Xiubo Li <xiubli@redhat.com>
Date: Fri, 5 Nov 2021 17:34:18 +0800
Subject: ceph: fix mdsmap decode when there are MDS's beyond max_mds
Git-commit: 0e24421ac431e7af62d4acef6c638b85aae51728
Patch-mainline: v5.16-rc1
References: jsc#SES-1880

If the max_mds is decreased in a cephfs cluster, there is a window
of time before the MDSs are removed. If a map goes out during this
period, the mdsmap may show the decreased max_mds but still shows
those MDSes as in or in the export target list.

Ensure that we don't fail the map decode in that case.

Cc: stable@vger.kernel.org
URL: https://tracker.ceph.com/issues/52436
Fixes: d517b3983dd3 ("ceph: reconnect to the export targets on new mdsmaps")
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
 fs/ceph/mdsmap.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
index 61d67cbcb367..30387733765d 100644
--- a/fs/ceph/mdsmap.c
+++ b/fs/ceph/mdsmap.c
@@ -263,10 +263,6 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end, bool msgr2)
 				goto nomem;
 			for (j = 0; j < num_export_targets; j++) {
 				target = ceph_decode_32(&pexport_targets);
-				if (target >= m->possible_max_rank) {
-					err = -EIO;
-					goto corrupt;
-				}
 				info->export_targets[j] = target;
 			}
 		} else {