This is a note to let you know that I've just added the patch titled
ceph: defer stopping mdsc delayed_work
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-defer-stopping-mdsc-delayed_work.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 e7e607bd00481745550389a29ecabe33e13d67cf Mon Sep 17 00:00:00 2001
From: Xiubo Li <xiubli@xxxxxxxxxx>
Date: Tue, 25 Jul 2023 12:03:59 +0800
Subject: ceph: defer stopping mdsc delayed_work
From: Xiubo Li <xiubli@xxxxxxxxxx>
commit e7e607bd00481745550389a29ecabe33e13d67cf upstream.
Flushing the dirty buffer may take a long time if the cluster is
overloaded or if there is network issue. So we should ping the
MDSs periodically to keep alive, else the MDS will blocklist
the kclient.
Cc: stable@xxxxxxxxxxxxxxx
Link: https://tracker.ceph.com/issues/61843
Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
Reviewed-by: Milind Changire <mchangir@xxxxxxxxxx>
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ceph/mds_client.c | 4 ++--
fs/ceph/mds_client.h | 5 +++++
fs/ceph/super.c | 10 ++++++++++
3 files changed, 17 insertions(+), 2 deletions(-)
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -4762,7 +4762,7 @@ static void delayed_work(struct work_str
dout("mdsc delayed_work\n");
- if (mdsc->stopping)
+ if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHED)
return;
mutex_lock(&mdsc->mutex);
@@ -4941,7 +4941,7 @@ void send_flush_mdlog(struct ceph_mds_se
void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
{
dout("pre_umount\n");
- mdsc->stopping = 1;
+ mdsc->stopping = CEPH_MDSC_STOPPING_BEGIN;
ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true);
ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false);
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -380,6 +380,11 @@ struct cap_wait {
int want;
};
+enum {
+ CEPH_MDSC_STOPPING_BEGIN = 1,
+ CEPH_MDSC_STOPPING_FLUSHED = 2,
+};
+
/*
* mds client state
*/
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -1374,6 +1374,16 @@ static void ceph_kill_sb(struct super_bl
ceph_mdsc_pre_umount(fsc->mdsc);
flush_fs_workqueues(fsc);
+ /*
+ * Though the kill_anon_super() will finally trigger the
+ * sync_filesystem() anyway, we still need to do it here
+ * and then bump the stage of shutdown to stop the work
+ * queue as earlier as possible.
+ */
+ sync_filesystem(s);
+
+ fsc->mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHED;
+
kill_anon_super(s);
fsc->client->extra_mon_dispatch = NULL;
Patches currently in stable-queue which might be from xiubli@xxxxxxxxxx are
queue-6.4/ceph-defer-stopping-mdsc-delayed_work.patch
queue-6.4/libceph-fix-potential-hang-in-ceph_osdc_notify.patch
