From: Li Nan linan122@huawei.com
[ Upstream commit 9674f54e41fffaf06f6a60202e1fa4cc13de3cf5 ]
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: Sasha Levin sashal@kernel.org --- drivers/md/md.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c index d6f12338cb989..09c7f52156f3f 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -6243,7 +6243,15 @@ 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 = 0; mddev->metadata_type[0] = 0; @@ -7562,7 +7570,6 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode, 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; @@ -7649,7 +7656,6 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode, err = -EBUSY; goto out; } - did_set_md_closing = true; mutex_unlock(&mddev->open_mutex); sync_blockdev(bdev); } @@ -7813,7 +7819,7 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode, 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; }