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md: don't leave 'MD_RECOVERY_FROZEN' in error path of md_set_readonly() 

[ Upstream commit c9f7cb5b2bc968adcdc686c197ed108f47fd8eb0 ]

If md_set_readonly() failed, the array could still be read-write, however
'MD_RECOVERY_FROZEN' could still be set, which leave the array in an
abnormal state that sync or recovery can't continue anymore.
Hence make sure the flag is cleared after md_set_readonly() returns.

Fixes: 88724bfa68 ("md: wait for pending superblock updates before switching to read-only")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20231205094215.1824240-3-yukuai1@huaweicloud.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yu Kuai 2023-12-05 17:42:14 +08:00 committed by Greg Kroah-Hartman
parent 7442310ee4
commit 49b79af00d
1 changed files with 13 additions and 11 deletions
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24
drivers/md/md.c
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@ -6316,6 +6316,9 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
int err = 0;
int did_freeze = 0;
if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
return -EBUSY;
if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
did_freeze = 1;
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
@ -6330,8 +6333,6 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
*/
md_wakeup_thread_directly(mddev->sync_thread);
if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
return -EBUSY;
mddev_unlock(mddev);
wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
&mddev->recovery));
@ -6344,29 +6345,30 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
mddev->sync_thread ||
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
pr_warn("md: %s still in use.\n",mdname(mddev));
if (did_freeze) {
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
}
err = -EBUSY;
goto out;
}
if (mddev->pers) {
__md_stop_writes(mddev);
err = -ENXIO;
if (mddev->ro == MD_RDONLY)
if (mddev->ro == MD_RDONLY) {
err = -ENXIO;
goto out;
}
mddev->ro = MD_RDONLY;
set_disk_ro(mddev->gendisk, 1);
}
out:
if ((mddev->pers && !err) || did_freeze) {
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
sysfs_notify_dirent_safe(mddev->sysfs_state);
err = 0;
}
out:
mutex_unlock(&mddev->open_mutex);
return err;
}