From: Xiubo Li <xiubli@xxxxxxxxxx> 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@xxxxxxxxxxxxxxx URL: https://tracker.ceph.com/issues/52436 Fixes: d517b3983dd3 ("ceph: reconnect to the export targets on new mdsmaps") Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx> Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx> Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/ceph/mdsmap.c | 4 ---- 1 file changed, 4 deletions(-) --- a/fs/ceph/mdsmap.c +++ b/fs/ceph/mdsmap.c @@ -263,10 +263,6 @@ struct ceph_mdsmap *ceph_mdsmap_decode(v 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 {
