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Message-Id: <20230330202046.795213-2-yukuai1@huaweicloud.com>
Date: Fri, 31 Mar 2023 04:20:44 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: logang@...tatee.com, song@...nel.org
Cc: linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
yukuai3@...wei.com, yukuai1@...weicloud.com, yi.zhang@...wei.com,
yangerkun@...wei.com
Subject: [PATCH v3 1/3] md: pass a md_thread pointer to md_register_thread()
From: Yu Kuai <yukuai3@...wei.com>
Prepare to protect md_thread with rcu, there are no functional changes.
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
drivers/md/md-cluster.c | 11 +++++------
drivers/md/md-multipath.c | 6 +++---
drivers/md/md.c | 27 ++++++++++++++-------------
drivers/md/md.h | 7 +++----
drivers/md/raid1.c | 5 ++---
drivers/md/raid10.c | 15 ++++++---------
drivers/md/raid5-cache.c | 5 ++---
drivers/md/raid5.c | 15 ++++++---------
8 files changed, 41 insertions(+), 50 deletions(-)
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 10e0c5381d01..c19e29cb73bf 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -362,9 +362,8 @@ static void __recover_slot(struct mddev *mddev, int slot)
set_bit(slot, &cinfo->recovery_map);
if (!cinfo->recovery_thread) {
- cinfo->recovery_thread = md_register_thread(recover_bitmaps,
- mddev, "recover");
- if (!cinfo->recovery_thread) {
+ if (md_register_thread(&cinfo->recovery_thread, recover_bitmaps,
+ mddev, "recover")) {
pr_warn("md-cluster: Could not create recovery thread\n");
return;
}
@@ -888,9 +887,9 @@ static int join(struct mddev *mddev, int nodes)
goto err;
}
/* Initiate the communication resources */
- ret = -ENOMEM;
- cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv");
- if (!cinfo->recv_thread) {
+ ret = md_register_thread(&cinfo->recv_thread, recv_daemon, mddev,
+ "cluster_recv");
+ if (ret) {
pr_err("md-cluster: cannot allocate memory for recv_thread!\n");
goto err;
}
diff --git a/drivers/md/md-multipath.c b/drivers/md/md-multipath.c
index 66edf5e72bd6..ceec9e4b2a60 100644
--- a/drivers/md/md-multipath.c
+++ b/drivers/md/md-multipath.c
@@ -400,9 +400,9 @@ static int multipath_run (struct mddev *mddev)
if (ret)
goto out_free_conf;
- mddev->thread = md_register_thread(multipathd, mddev,
- "multipath");
- if (!mddev->thread)
+ ret = md_register_thread(&mddev->thread, multipathd, mddev,
+ "multipath");
+ if (ret)
goto out_free_conf;
pr_info("multipath: array %s active with %d out of %d IO paths\n",
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 8e1f7442ca1b..6a678b4c584e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7929,29 +7929,32 @@ void md_wakeup_thread(struct md_thread *thread)
}
EXPORT_SYMBOL(md_wakeup_thread);
-struct md_thread *md_register_thread(void (*run) (struct md_thread *),
- struct mddev *mddev, const char *name)
+int md_register_thread(struct md_thread **threadp,
+ void (*run)(struct md_thread *),
+ struct mddev *mddev, const char *name)
{
struct md_thread *thread;
thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
if (!thread)
- return NULL;
+ return -ENOMEM;
init_waitqueue_head(&thread->wqueue);
thread->run = run;
thread->mddev = mddev;
thread->timeout = MAX_SCHEDULE_TIMEOUT;
- thread->tsk = kthread_run(md_thread, thread,
- "%s_%s",
- mdname(thread->mddev),
- name);
+ thread->tsk = kthread_run(md_thread, thread, "%s_%s",
+ mdname(thread->mddev), name);
if (IS_ERR(thread->tsk)) {
+ int err = PTR_ERR(thread->tsk);
+
kfree(thread);
- return NULL;
+ return err;
}
- return thread;
+
+ *threadp = thread;
+ return 0;
}
EXPORT_SYMBOL(md_register_thread);
@@ -9232,10 +9235,8 @@ static void md_start_sync(struct work_struct *ws)
{
struct mddev *mddev = container_of(ws, struct mddev, del_work);
- mddev->sync_thread = md_register_thread(md_do_sync,
- mddev,
- "resync");
- if (!mddev->sync_thread) {
+ if (md_register_thread(&mddev->sync_thread, md_do_sync, mddev,
+ "resync")) {
pr_warn("%s: could not start resync thread...\n",
mdname(mddev));
/* leave the spares where they are, it shouldn't hurt */
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 10d425a3daa3..d0cc4544893d 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -735,10 +735,9 @@ extern int register_md_cluster_operations(struct md_cluster_operations *ops,
extern int unregister_md_cluster_operations(void);
extern int md_setup_cluster(struct mddev *mddev, int nodes);
extern void md_cluster_stop(struct mddev *mddev);
-extern struct md_thread *md_register_thread(
- void (*run)(struct md_thread *thread),
- struct mddev *mddev,
- const char *name);
+int md_register_thread(struct md_thread **threadp,
+ void (*run)(struct md_thread *thread),
+ struct mddev *mddev, const char *name);
extern void md_unregister_thread(struct md_thread **threadp);
extern void md_wakeup_thread(struct md_thread *thread);
extern void md_check_recovery(struct mddev *mddev);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 68a9e2d9985b..1217c1db0a40 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -3083,9 +3083,8 @@ static struct r1conf *setup_conf(struct mddev *mddev)
}
}
- err = -ENOMEM;
- conf->thread = md_register_thread(raid1d, mddev, "raid1");
- if (!conf->thread)
+ err = md_register_thread(&conf->thread, raid1d, mddev, "raid1");
+ if (err)
goto abort;
return conf;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 6c66357f92f5..0171ba4f19b0 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4077,9 +4077,8 @@ static struct r10conf *setup_conf(struct mddev *mddev)
init_waitqueue_head(&conf->wait_barrier);
atomic_set(&conf->nr_pending, 0);
- err = -ENOMEM;
- conf->thread = md_register_thread(raid10d, mddev, "raid10");
- if (!conf->thread)
+ err = md_register_thread(&conf->thread, raid10d, mddev, "raid10");
+ if (err)
goto out;
conf->mddev = mddev;
@@ -4273,9 +4272,8 @@ static int raid10_run(struct mddev *mddev)
clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
- mddev->sync_thread = md_register_thread(md_do_sync, mddev,
- "reshape");
- if (!mddev->sync_thread)
+ if (md_register_thread(&mddev->sync_thread, md_do_sync, mddev,
+ "reshape"))
goto out_free_conf;
}
@@ -4686,9 +4684,8 @@ static int raid10_start_reshape(struct mddev *mddev)
set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
- mddev->sync_thread = md_register_thread(md_do_sync, mddev,
- "reshape");
- if (!mddev->sync_thread) {
+ if (md_register_thread(&mddev->sync_thread, md_do_sync, mddev,
+ "reshape")) {
ret = -EAGAIN;
goto abort;
}
diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 46182b955aef..0464d4d551fc 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -3121,9 +3121,8 @@ int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev)
spin_lock_init(&log->tree_lock);
INIT_RADIX_TREE(&log->big_stripe_tree, GFP_NOWAIT | __GFP_NOWARN);
- log->reclaim_thread = md_register_thread(r5l_reclaim_thread,
- log->rdev->mddev, "reclaim");
- if (!log->reclaim_thread)
+ if (md_register_thread(&log->reclaim_thread, r5l_reclaim_thread,
+ log->rdev->mddev, "reclaim"))
goto reclaim_thread;
log->reclaim_thread->timeout = R5C_RECLAIM_WAKEUP_INTERVAL;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 7b820b81d8c2..04b1093195d0 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -7665,11 +7665,10 @@ static struct r5conf *setup_conf(struct mddev *mddev)
}
sprintf(pers_name, "raid%d", mddev->new_level);
- conf->thread = md_register_thread(raid5d, mddev, pers_name);
- if (!conf->thread) {
+ ret = md_register_thread(&conf->thread, raid5d, mddev, pers_name);
+ if (ret) {
pr_warn("md/raid:%s: couldn't allocate thread.\n",
mdname(mddev));
- ret = -ENOMEM;
goto abort;
}
@@ -7989,9 +7988,8 @@ static int raid5_run(struct mddev *mddev)
clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
- mddev->sync_thread = md_register_thread(md_do_sync, mddev,
- "reshape");
- if (!mddev->sync_thread)
+ if (md_register_thread(&mddev->sync_thread, md_do_sync, mddev,
+ "reshape"))
goto abort;
}
@@ -8567,9 +8565,8 @@ static int raid5_start_reshape(struct mddev *mddev)
clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
- mddev->sync_thread = md_register_thread(md_do_sync, mddev,
- "reshape");
- if (!mddev->sync_thread) {
+ if (md_register_thread(&mddev->sync_thread, md_do_sync, mddev,
+ "reshape")) {
mddev->recovery = 0;
spin_lock_irq(&conf->device_lock);
write_seqcount_begin(&conf->gen_lock);
--
2.39.2
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