md: reinitialise more mddev fields in do_md_stop.

I keep finding problems where an mddev gets reused and some fields has a value
from a previous usage that confuses the new usage.  So clear all fields that
could possible need clearing when calling do_md_stop.

Also initialise the 'level' of a new array to LEVEL_NONE (which isn't 0).

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 61767f1..7a44c81 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -276,6 +276,7 @@ static mddev_t * mddev_find(dev_t unit)
        init_waitqueue_head(&new->sb_wait);
        new->reshape_position = MaxSector;
        new->resync_max = MaxSector;
+       new->level = LEVEL_NONE;
 
        new->queue = blk_alloc_queue(GFP_KERNEL);
        if (!new->queue) {
@@ -3714,6 +3715,30 @@ static int do_md_stop(mddev_t * mddev, int mode)
                mddev->reshape_position = MaxSector;
                mddev->external = 0;
                mddev->persistent = 0;
+               mddev->level = LEVEL_NONE;
+               mddev->clevel[0] = 0;
+               mddev->flags = 0;
+               mddev->ro = 0;
+               mddev->metadata_type[0] = 0;
+               mddev->chunk_size = 0;
+               mddev->ctime = mddev->utime = 0;
+               mddev->layout = 0;
+               mddev->max_disks = 0;
+               mddev->events = 0;
+               mddev->delta_disks = 0;
+               mddev->new_level = LEVEL_NONE;
+               mddev->new_layout = 0;
+               mddev->new_chunk = 0;
+               mddev->curr_resync = 0;
+               mddev->resync_mismatches = 0;
+               mddev->suspend_lo = mddev->suspend_hi = 0;
+               mddev->sync_speed_min = mddev->sync_speed_max = 0;
+               mddev->recovery = 0;
+               mddev->in_sync = 0;
+               mddev->changed = 0;
+               mddev->degraded = 0;
+               mddev->barriers_work = 0;
+               mddev->safemode = 0;
 
        } else if (mddev->pers)
                printk(KERN_INFO "md: %s switched to read-only mode.\n",