md: enhance checking in md_check_recovery()
For md_check_recovery():
1) if 'MD_RECOVERY_RUNING' is not set, register new sync_thread.
2) if 'MD_RECOVERY_RUNING' is set:
a) if 'MD_RECOVERY_DONE' is not set, don't do anything, wait for
md_do_sync() to be done.
b) if 'MD_RECOVERY_DONE' is set, unregister sync_thread. Current code
expects that sync_thread is not NULL, otherwise new sync_thread will
be registered, which will corrupt raid.
This patch add a WARN_ON_ONCE() in the above corruption, and make sure
md_check_recovery() won't register new sync_thread if 'MD_RECOVERY_RUNING'
is still set.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230322064122.2384589-7-yukuai1@huaweicloud.com
1 file changed
