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md: sync blockdev before stopping raid or setting readonly

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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>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240226031444.3606764-8-linan666@huaweicloud.com
This commit is contained in:
Li Nan 2024-02-26 11:14:42 +08:00 committed by Song Liu
parent f74aaf614e
commit 99b902ac17
1 changed files with 16 additions and 0 deletions
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16
drivers/md/md.c
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@ -4500,6 +4500,17 @@ 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;
}
@ -4599,6 +4610,11 @@ 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 =