This is a note to let you know that I've just added the patch titled
ceph: don't let check_caps skip sending responses for revoke msgs
to the 6.4-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-don-t-let-check_caps-skip-sending-responses-for-revoke-msgs.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 257e6172ab36ebbe295a6c9ee9a9dd0fe54c1dc2 Mon Sep 17 00:00:00 2001
From: Xiubo Li <xiubli@xxxxxxxxxx>
Date: Wed, 28 Jun 2023 07:57:09 +0800
Subject: ceph: don't let check_caps skip sending responses for revoke msgs
From: Xiubo Li <xiubli@xxxxxxxxxx>
commit 257e6172ab36ebbe295a6c9ee9a9dd0fe54c1dc2 upstream.
If a client sends out a cap update dropping caps with the prior 'seq'
just before an incoming cap revoke request, then the client may drop
the revoke because it believes it's already released the requested
capabilities.
This causes the MDS to wait indefinitely for the client to respond
to the revoke. It's therefore always a good idea to ack the cap
revoke request with the bumped up 'seq'.
Cc: stable@xxxxxxxxxxxxxxx
Link: https://tracker.ceph.com/issues/61782
Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
Reviewed-by: Milind Changire <mchangir@xxxxxxxxxx>
Reviewed-by: Patrick Donnelly <pdonnell@xxxxxxxxxx>
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ceph/caps.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3560,6 +3560,15 @@ static void handle_cap_grant(struct inod
}
BUG_ON(cap->issued & ~cap->implemented);
+ /* don't let check_caps skip sending a response to MDS for revoke msgs */
+ if (le32_to_cpu(grant->op) == CEPH_CAP_OP_REVOKE) {
+ cap->mds_wanted = 0;
+ if (cap == ci->i_auth_cap)
+ check_caps = 1; /* check auth cap only */
+ else
+ check_caps = 2; /* check all caps */
+ }
+
if (extra_info->inline_version > 0 &&
extra_info->inline_version >= ci->i_inline_version) {
ci->i_inline_version = extra_info->inline_version;
Patches currently in stable-queue which might be from xiubli@xxxxxxxxxx are
queue-6.4/ceph-fix-blindly-expanding-the-readahead-windows.patch
queue-6.4/ceph-don-t-let-check_caps-skip-sending-responses-for-revoke-msgs.patch
queue-6.4/libceph-harden-msgr2.1-frame-segment-length-checks.patch
queue-6.4/ceph-add-a-dedicated-private-data-for-netfs-rreq.patch
