From: Yu Kuai <yukuai1@huaweicloud.com>
To: guoqing.jiang@linux.dev, agk@redhat.com, snitzer@kernel.org,
dm-devel@redhat.com, song@kernel.org
Cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com,
yangerkun@huawei.com
Subject: [PATCH -next v2 2/6] md: refactor action_store() for 'idle' and 'frozen'
Date: Mon, 29 May 2023 21:20:33 +0800 [thread overview]
Message-ID: <20230529132037.2124527-3-yukuai1@huaweicloud.com> (raw)
In-Reply-To: <20230529132037.2124527-1-yukuai1@huaweicloud.com>
From: Yu Kuai <yukuai3@huawei.com>
Prepare to handle 'idle' and 'frozen' differently to fix a deadlock, there
are no functional changes except that MD_RECOVERY_RUNNING is checked
again after 'reconfig_mutex' is held.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
drivers/md/md.c | 61 ++++++++++++++++++++++++++++++++++++-------------
1 file changed, 45 insertions(+), 16 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 9b97731e1fe4..23e8e7eae062 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4755,6 +4755,46 @@ action_show(struct mddev *mddev, char *page)
return sprintf(page, "%s\n", type);
}
+static void stop_sync_thread(struct mddev *mddev)
+{
+ if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
+ return;
+
+ if (mddev_lock(mddev))
+ return;
+
+ /*
+ * Check again in case MD_RECOVERY_RUNNING is cleared before lock is
+ * held.
+ */
+ if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
+ mddev_unlock(mddev);
+ return;
+ }
+
+ if (work_pending(&mddev->del_work))
+ flush_workqueue(md_misc_wq);
+
+ if (mddev->sync_thread) {
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+ md_reap_sync_thread(mddev);
+ }
+
+ mddev_unlock(mddev);
+}
+
+static void idle_sync_thread(struct mddev *mddev)
+{
+ clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
+ stop_sync_thread(mddev);
+}
+
+static void frozen_sync_thread(struct mddev *mddev)
+{
+ set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
+ stop_sync_thread(mddev);
+}
+
static ssize_t
action_store(struct mddev *mddev, const char *page, size_t len)
{
@@ -4762,22 +4802,11 @@ action_store(struct mddev *mddev, const char *page, size_t len)
return -EINVAL;
- if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
- if (cmd_match(page, "frozen"))
- set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
- else
- clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
- if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
- mddev_lock(mddev) == 0) {
- if (work_pending(&mddev->del_work))
- flush_workqueue(md_misc_wq);
- if (mddev->sync_thread) {
- set_bit(MD_RECOVERY_INTR, &mddev->recovery);
- md_reap_sync_thread(mddev);
- }
- mddev_unlock(mddev);
- }
- } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
+ if (cmd_match(page, "idle"))
+ idle_sync_thread(mddev);
+ else if (cmd_match(page, "frozen"))
+ frozen_sync_thread(mddev);
+ else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return -EBUSY;
else if (cmd_match(page, "resync"))
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
--
2.39.2
next prev parent reply other threads:[~2023-05-29 13:24 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-29 13:20 [PATCH -next v2 0/6] md: fix that MD_RECOVERY_RUNNING can be cleared while sync_thread is still running Yu Kuai
2023-05-29 13:20 ` [PATCH -next v2 1/6] Revert "md: unlock mddev before reap sync_thread in action_store" Yu Kuai
2023-06-13 6:25 ` Xiao Ni
2023-06-13 11:58 ` Yu Kuai
2023-05-29 13:20 ` Yu Kuai [this message]
2023-06-13 8:02 ` [dm-devel] [PATCH -next v2 2/6] md: refactor action_store() for 'idle' and 'frozen' Xiao Ni
2023-06-13 12:00 ` Yu Kuai
2023-06-13 12:25 ` Xiao Ni
2023-06-13 12:44 ` Yu Kuai
2023-06-13 14:14 ` Xiao Ni
2023-05-29 13:20 ` [PATCH -next v2 3/6] md: add a mutex to synchronize idle and frozen in action_store() Yu Kuai
2023-06-13 14:43 ` [dm-devel] " Xiao Ni
2023-06-14 1:15 ` Yu Kuai
2023-06-16 6:41 ` Song Liu
2023-05-29 13:20 ` [PATCH -next v2 4/6] md: refactor idle/frozen_sync_thread() to fix deadlock Yu Kuai
2023-06-13 14:50 ` [dm-devel] " Xiao Ni
2023-06-14 1:48 ` Yu Kuai
2023-06-14 2:04 ` Yu Kuai
2023-06-14 7:12 ` Xiao Ni
2023-06-14 7:38 ` Yu Kuai
2023-06-14 7:57 ` Xiao Ni
2023-06-14 8:28 ` Yu Kuai
2023-06-14 9:08 ` Xiao Ni
2023-06-15 1:28 ` Yu Kuai
2023-06-15 8:01 ` Xiao Ni
2023-06-15 8:17 ` Xiao Ni
2023-06-15 9:05 ` Yu Kuai
2023-06-15 9:14 ` Xiao Ni
2023-06-14 3:47 ` Xiao Ni
2023-06-14 6:04 ` Yu Kuai
2023-06-14 6:37 ` Xiao Ni
2023-05-29 13:20 ` [PATCH -next v2 5/6] md: wake up 'resync_wait' at last in md_reap_sync_thread() Yu Kuai
2023-06-14 7:20 ` Xiao Ni
2023-05-29 13:20 ` [PATCH -next v2 6/6] md: enhance checking in md_check_recovery() Yu Kuai
2023-06-14 7:24 ` [dm-devel] " Xiao Ni
2023-06-08 2:41 ` [PATCH -next v2 0/6] md: fix that MD_RECOVERY_RUNNING can be cleared while sync_thread is still running Yu Kuai
2023-06-09 4:44 ` Song Liu
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