MD: move thread wakeups into resume

Move personality and sync/recovery thread starting outside md_run.

Moving the wakeup's of the personality and sync/recovery threads out of
md_run and into do_md_run and mddev_resume solves two issues:
1) It allows bitmap_load to be called before the sync_thread is run and
2) when MD personalities are used by device-mapper (dm-raid.c), the start-up
of the array is better alligned with device-mapper primatives
(CTR/resume/suspend/DTR).  I/O - in this case, recovery operations - should
not happen until after a resume has taken place.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 3715e89dcaae9178bcf5fbedd15afcfe62863ff4..d5385188c44574b4ffb12851ec9fcdcdb85fdfc6 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -351,6 +351,9 @@ void mddev_resume(mddev_t *mddev)
        mddev->suspended = 0;
        wake_up(&mddev->sb_wait);
        mddev->pers->quiesce(mddev, 0);
+
+       md_wakeup_thread(mddev->thread);
+       md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
 }
 EXPORT_SYMBOL_GPL(mddev_resume);
 
@@ -4619,9 +4622,6 @@ int md_run(mddev_t *mddev)
        if (mddev->flags)
                md_update_sb(mddev, 0);
 
-       md_wakeup_thread(mddev->thread);
-       md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
-
        md_new_event(mddev);
        sysfs_notify_dirent_safe(mddev->sysfs_state);
        sysfs_notify_dirent_safe(mddev->sysfs_action);
@@ -4642,6 +4642,10 @@ static int do_md_run(mddev_t *mddev)
                bitmap_destroy(mddev);
                goto out;
        }
+
+       md_wakeup_thread(mddev->thread);
+       md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
+
        set_capacity(mddev->gendisk, mddev->array_sectors);
        revalidate_disk(mddev->gendisk);
        mddev->changed = 1;