5171         md_wakeup_thread(mddev->thread);

4823 static void raid5d(struct md_thread *thread)
4824 {
4825         struct mddev *mddev = thread->mddev;
4826         struct r5conf *conf = mddev->private;
4827         int handled;
4828         struct blk_plug plug;
4829 
4830         pr_debug("+++ raid5d active\n");
4831 
4832         md_check_recovery(mddev);

7672 /*
7673  * This routine is regularly called by all per-raid-array threads to
7674  * deal with generic issues like resync and super-block update.
7675  * Raid personalities that don't have a thread (linear/raid0) do not
7676  * need this as they never do any recovery or update the superblock.
7677  *
7678  * It does not do any resync itself, but rather "forks" off other threads
7679  * to do that as needed.
7680  * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7681  * "->recovery" and create a thread at ->sync_thread.
7682  * When the thread finishes it sets MD_RECOVERY_DONE
7683  * and wakeups up this thread which will reap the thread and finish up.
7684  * This thread also removes any faulty devices (with nr_pending == 0).
7685  *
7686  * The overall approach is:
7687  *  1/ if the superblock needs updating, update it.
7688  *  2/ If a recovery thread is running, don't do anything else.
7689  *  3/ If recovery has finished, clean up, possibly marking spares active.
7690  *  4/ If there are any faulty devices, remove them.
7691  *  5/ If array is degraded, try to add spares devices
7692  *  6/ If array has spares or is not in-sync, start a resync thread.
7693  */