From 11a102de53a7403252d50de4acdfafd47d734fad Mon Sep 17 00:00:00 2001 From: Xiubo Li Date: Fri, 5 Nov 2021 17:34:18 +0800 Subject: [PATCH] ceph: fix mdsmap decode when there are MDS's beyond max_mds commit 0e24421ac431e7af62d4acef6c638b85aae51728 upstream. 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 Reviewed-by: Jeff Layton Signed-off-by: Ilya Dryomov Signed-off-by: Greg Kroah-Hartman --- fs/ceph/mdsmap.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c index 61d67cbcb3671..30387733765d5 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 {