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md: unlock mddev before reap sync_thread in action_store

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Since the bug which commit 8b48ec23cc51a ("md: don't unregister sync_thread
with reconfig_mutex held") fixed is related with action_store path, other
callers which reap sync_thread didn't need to be changed.

Let's pull md_unregister_thread from md_reap_sync_thread, then fix previous
bug with belows.

1. unlock mddev before md_reap_sync_thread in action_store.
2. save reshape_position before unlock, then restore it to ensure position
   not changed accidentally by others.

Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Guoqing Jiang 2022-06-21 11:11:29 +08:00 committed by Jens Axboe
parent 05ce7fb946
commit 9dfbdafda3
2 changed files with 18 additions and 2 deletions
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1
drivers/md/dm-raid.c
View File

@ -3728,6 +3728,7 @@ static int raid_message(struct dm_target *ti, unsigned int argc, char **argv,
if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) {
if (mddev->sync_thread) {
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
md_unregister_thread(&mddev->sync_thread);
md_reap_sync_thread(mddev);
}
} else if (decipher_sync_action(mddev, mddev->recovery) != st_idle)

19
drivers/md/md.c
View File

@ -4830,6 +4830,19 @@ action_store(struct mddev *mddev, const char *page, size_t len)
if (work_pending(&mddev->del_work))
flush_workqueue(md_misc_wq);
if (mddev->sync_thread) {
sector_t save_rp = mddev->reshape_position;
mddev_unlock(mddev);
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
md_unregister_thread(&mddev->sync_thread);
mddev_lock_nointr(mddev);
/*
* set RECOVERY_INTR again and restore reshape
* position in case others changed them after
* got lock, eg, reshape_position_store and
* md_check_recovery.
*/
mddev->reshape_position = save_rp;
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
md_reap_sync_thread(mddev);
}
@ -6197,6 +6210,7 @@ static void __md_stop_writes(struct mddev *mddev)
flush_workqueue(md_misc_wq);
if (mddev->sync_thread) {
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
md_unregister_thread(&mddev->sync_thread);
md_reap_sync_thread(mddev);
}
@ -9309,6 +9323,7 @@ void md_check_recovery(struct mddev *mddev)
* ->spare_active and clear saved_raid_disk
*/
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
md_unregister_thread(&mddev->sync_thread);
md_reap_sync_thread(mddev);
clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
@ -9344,6 +9359,7 @@ void md_check_recovery(struct mddev *mddev)
goto unlock;
}
if (mddev->sync_thread) {
md_unregister_thread(&mddev->sync_thread);
md_reap_sync_thread(mddev);
goto unlock;
}
@ -9423,8 +9439,7 @@ void md_reap_sync_thread(struct mddev *mddev)
sector_t old_dev_sectors = mddev->dev_sectors;
bool is_reshaped = false;
/* resync has finished, collect result */
md_unregister_thread(&mddev->sync_thread);
/* sync_thread should be unregistered, collect result */
if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
mddev->degraded != mddev->raid_disks) {