Received-SPF: pass (google.com: domain of linux-kernel+bounces-54550-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
From: linan666@huaweicloud.com
To: song@kernel.org,
	mariusz.tkaczyk@linux.intel.com,
	shli@fb.com,
	neilb@suse.com
Cc: linux-raid@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linan666@huaweicloud.com,
	yukuai3@huawei.com,
	yi.zhang@huawei.com,
	houtao1@huawei.com,
	yangerkun@huawei.com
Subject: [PATCH v6 7/9] md: sync blockdev before stopping raid or setting readonly
Date: Tue,  6 Feb 2024 16:55:09 +0800
Message-Id: <20240206085511.2841555-8-linan666@huaweicloud.com>
In-Reply-To: <20240206085511.2841555-1-linan666@huaweicloud.com>
References: <20240206085511.2841555-1-linan666@huaweicloud.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

From: Li Nan <linan122@huawei.com>

Commit a05b7ea03d72 ("md: avoid crash when stopping md array races
with closing other open fds.") added sync_block before stopping raid and
setting readonly. Later in commit 260fa034ef7a ("md: avoid deadlock when
dirty buffers during md_stop.") it is moved to ioctl. array_state_store()
was ignored. Add sync blockdev to array_state_store() now.

Signed-off-by: Li Nan <linan122@huawei.com>
---
 drivers/md/md.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 04826431d3c6..200410a8adf3 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4493,6 +4493,17 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
 	case broken:		/* cannot be set */
 	case bad_word:
 		return -EINVAL;
+	case clear:
+	case readonly:
+	case inactive:
+	case read_auto:
+		if (!mddev->pers || !md_is_rdwr(mddev))
+			break;
+		/* write sysfs will not open mddev and opener should be 0 */
+		err = mddev_set_closing_and_sync_blockdev(mddev, 0);
+		if (err)
+			return err;
+		break;
 	default:
 		break;
 	}
@@ -4592,6 +4603,11 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
 		sysfs_notify_dirent_safe(mddev->sysfs_state);
 	}
 	mddev_unlock(mddev);
+
+	if (st == readonly || st == read_auto || st == inactive ||
+	    (err && st == clear))
+		clear_bit(MD_CLOSING, &mddev->flags);
+
 	return err ?: len;
 }
 static struct md_sysfs_entry md_array_state =
-- 
2.39.2