This is a note to let you know that I've just added the patch titled
ceph: fix mdsmap decode when there are MDS's beyond max_mds
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ceph-fix-mdsmap-decode-when-there-are-mds-s-beyond-max_mds.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0e24421ac431e7af62d4acef6c638b85aae51728 Mon Sep 17 00:00:00 2001
From: Xiubo Li <xiubli@xxxxxxxxxx>
Date: Fri, 5 Nov 2021 17:34:18 +0800
Subject: ceph: fix mdsmap decode when there are MDS's beyond max_mds
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 {
Patches currently in stable-queue which might be from xiubli@xxxxxxxxxx are
queue-5.15/ceph-fix-mdsmap-decode-when-there-are-mds-s-beyond-max_mds.patch
