linux-kernel - [PATCH -next 04/29] md: add new helpers to suspend/resume and lock/unlock array

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230803132930.2742286-5-yukuai1@huaweicloud.com>
Date:   Thu,  3 Aug 2023 21:29:05 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     song@...nel.org, xni@...hat.com
Cc:     linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com, yukuai1@...weicloud.com, yi.zhang@...wei.com,
        yangerkun@...wei.com
Subject: [PATCH -next 04/29] md: add new helpers to suspend/resume and lock/unlock array

From: Yu Kuai <yukuai3@...wei.com>

The new helpers suspend the array first and then lock the array,

Prepare to refactor from:

mddev_lock/trylock/lock_nointr
mddev_suspend/pers->quiesce
mddev_resuem/pers->unquiesce
mddev_lock

With:

mddev_suspend_and_lock/trylock/lock_nointr
mddev_unlock_and_resume

After all the use cases is refactored, mddev_suspend/resume() will be
removed.

And mddev_suspend_and_lock() will also replace mddev_lock() for the case
that the array will be reconfigured, in order to synchronize with io to
prevent problems in many corner cases.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/md.h | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/md/md.h b/drivers/md/md.h
index 32bfe0fe0d97..3a2488231fd2 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -850,6 +850,42 @@ static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio
 		mddev->queue->limits.max_write_zeroes_sectors = 0;
 }
 
+static inline int mddev_suspend_and_lock(struct mddev *mddev)
+{
+	int ret;
+
+	__mddev_suspend(mddev);
+	ret = mddev_lock(mddev);
+	if (ret)
+		__mddev_resume(mddev);
+
+	return ret;
+}
+
+static inline void mddev_suspend_and_lock_nointr(struct mddev *mddev)
+{
+	__mddev_suspend(mddev);
+	mutex_lock(&mddev->reconfig_mutex);
+}
+
+static inline int mddev_suspend_and_trylock(struct mddev *mddev)
+{
+	int ret;
+
+	__mddev_suspend(mddev);
+	ret = mutex_trylock(&mddev->reconfig_mutex);
+	if (ret)
+		__mddev_resume(mddev);
+
+	return ret;
+}
+
+static inline void mddev_unlock_and_resume(struct mddev *mddev)
+{
+	mddev_unlock(mddev);
+	__mddev_resume(mddev);
+}
+
 struct mdu_array_info_s;
 struct mdu_disk_info_s;
 
-- 
2.39.2