linux-kernel - [PATCH v5 7/8] md: sync blockdev before stopping raid or setting readonly

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Date: Thu,  1 Feb 2024 14:34:03 +0800
From: linan666@...weicloud.com
To: song@...nel.org,
	neilb@...e.com,
	mariusz.tkaczyk@...ux.intel.com,
	shli@...com
Cc: linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linan666@...weicloud.com,
	yukuai3@...wei.com,
	yi.zhang@...wei.com,
	houtao1@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH v5 7/8] md: sync blockdev before stopping raid or setting readonly

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

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 4c7a0225f77d..86becf0015f5 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4493,6 +4493,16 @@ 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;
+		err = mddev_set_closing_and_sync_blockdev(mddev);
+		if (err)
+			return err;
+		break;
 	default:
 		break;
 	}
@@ -4518,6 +4528,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
 		spin_unlock(&mddev->lock);
 		return err ?: len;
 	}
+
 	err = mddev_lock(mddev);
 	if (err)
 		return err;
@@ -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