From 9674f54e41fffaf06f6a60202e1fa4cc13de3cf5 Mon Sep 17 00:00:00 2001
From: Li Nan <linan122@huawei.com>
Date: Mon, 26 Feb 2024 11:14:40 +0800
Subject: [PATCH] md: Don't clear MD_CLOSING when the raid is about to stop
Git-commit: 9674f54e41fffaf06f6a60202e1fa4cc13de3cf5
Patch-mainline: v6.9-rc1
References: git-fixes

The raid should not be opened anymore when it is about to be stopped.
However, other processes can open it again if the flag MD_CLOSING is
cleared before exiting. From now on, this flag will not be cleared when
the raid will be stopped.

Fixes: 065e519e71b2 ("md: MD_CLOSING needs to be cleared after called md_set_readonly or do_md_stop")
Signed-off-by: Li Nan <linan122@huawei.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240226031444.3606764-6-linan666@huaweicloud.com
Signed-off-by: Coly Li <colyli@suse.de>

---
 drivers/md/md.c |   14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6206,7 +6206,15 @@ static void md_clean(struct mddev *mddev
 	mddev->persistent = 0;
 	mddev->level = LEVEL_NONE;
 	mddev->clevel[0] = 0;
-	mddev->flags = 0;
+	/*
+	 * Don't clear MD_CLOSING, or mddev can be opened again.
+	 * 'hold_active != 0' means mddev is still in the creation
+	 * process and will be used later.
+	 */
+	if (mddev->hold_active)
+		mddev->flags = 0;
+	else
+		mddev->flags &= BIT_ULL_MASK(MD_CLOSING);
 	mddev->sb_flags = 0;
 	mddev->ro = MD_RDWR;
 	mddev->metadata_type[0] = 0;
@@ -7528,7 +7536,6 @@ static int md_ioctl(struct block_device
 	int err = 0;
 	void __user *argp = (void __user *)arg;
 	struct mddev *mddev = NULL;
-	bool did_set_md_closing = false;
 
 	if (!md_ioctl_valid(cmd))
 		return -ENOTTY;
@@ -7615,7 +7622,6 @@ static int md_ioctl(struct block_device
 			err = -EBUSY;
 			goto out;
 		}
-		did_set_md_closing = true;
 		mutex_unlock(&mddev->open_mutex);
 		sync_blockdev(bdev);
 	}
@@ -7778,7 +7784,7 @@ unlock:
 		mddev->hold_active = 0;
 	mddev_unlock(mddev);
 out:
-	if(did_set_md_closing)
+	if (cmd == STOP_ARRAY_RO || (err && cmd == STOP_ARRAY))
 		clear_bit(MD_CLOSING, &mddev->flags);
 	return err;
 }