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md: Make sure md_do_sync() will set MD_RECOVERY_DONE

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stop_sync_thread() will interrupt md_do_sync(), and md_do_sync() must
set MD_RECOVERY_DONE, so that follow up md_check_recovery() will
unregister sync_thread, clear MD_RECOVERY_RUNNING and wake up
stop_sync_thread().

If MD_RECOVERY_WAIT is set or the array is read-only, md_do_sync() will
return without setting MD_RECOVERY_DONE, and after commit f52f5c71f3
("md: fix stopping sync thread"), dm-raid switch from
md_reap_sync_thread() to stop_sync_thread() to unregister sync_thread
from md_stop() and md_stop_writes(), causing the test
shell/lvconvert-raid-reshape.sh hang.

We shouldn't switch back to md_reap_sync_thread() because it's
problematic in the first place. Fix the problem by making sure
md_do_sync() will set MD_RECOVERY_DONE.

Reported-by: Mikulas Patocka <mpatocka@redhat.com>
Closes: https://lore.kernel.org/all/ece2b06f-d647-6613-a534-ff4c9bec1142@redhat.com/
Fixes: d5d885fd51 ("md: introduce new personality funciton start()")
Fixes: 5fd6c1dce0 ("[PATCH] md: allow checkpoint of recovery with version-1 superblock")
Fixes: f52f5c71f3 ("md: fix stopping sync thread")
Cc: stable@vger.kernel.org # v6.7+
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240201092559.910982-4-yukuai1@huaweicloud.com
This commit is contained in:
Yu Kuai 2024-02-01 17:25:48 +08:00 committed by Song Liu
parent 55a48ad2db
commit 82ec0ae59d
1 changed files with 8 additions and 4 deletions
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12
drivers/md/md.c
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@ -8792,12 +8792,16 @@ void md_do_sync(struct md_thread *thread)
int ret;
/* just incase thread restarts... */
if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
return;
if (!md_is_rdwr(mddev)) {/* never try to sync a read-only array */
if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
goto skip;
if (test_bit(MD_RECOVERY_WAIT, &mddev->recovery) ||
!md_is_rdwr(mddev)) {/* never try to sync a read-only array */
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
return;
goto skip;
}
if (mddev_is_clustered(mddev)) {