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authorNeilBrown <neilb@suse.de>2009-08-02 20:59:55 -0400
committerNeilBrown <neilb@suse.de>2009-08-02 20:59:55 -0400
commit3a981b03f38dc3b8a69b77cbc679e66c1318a44a (patch)
tree7f8b0747385a02c793edd7df30d34c4c9c95b1a5 /drivers/md/md.c
parentac5e7113e74872928844d00085bd47c988f12728 (diff)
md: when a level change reduces the number of devices, remove the excess.
When an array is changed from RAID6 to RAID5, fewer drives are needed. So any device that is made superfluous by the level conversion must be marked as not-active. For the RAID6->RAID5 conversion, this will be a drive which only has 'Q' blocks on it. Cc: stable@kernel.org Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/md.c')
-rw-r--r--drivers/md/md.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 180949e94a7b..c194955aecae 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2695,6 +2695,7 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
2695 ssize_t rv = len; 2695 ssize_t rv = len;
2696 struct mdk_personality *pers; 2696 struct mdk_personality *pers;
2697 void *priv; 2697 void *priv;
2698 mdk_rdev_t *rdev;
2698 2699
2699 if (mddev->pers == NULL) { 2700 if (mddev->pers == NULL) {
2700 if (len == 0) 2701 if (len == 0)
@@ -2774,6 +2775,12 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
2774 mddev_suspend(mddev); 2775 mddev_suspend(mddev);
2775 mddev->pers->stop(mddev); 2776 mddev->pers->stop(mddev);
2776 module_put(mddev->pers->owner); 2777 module_put(mddev->pers->owner);
2778 /* Invalidate devices that are now superfluous */
2779 list_for_each_entry(rdev, &mddev->disks, same_set)
2780 if (rdev->raid_disk >= mddev->raid_disks) {
2781 rdev->raid_disk = -1;
2782 clear_bit(In_sync, &rdev->flags);
2783 }
2777 mddev->pers = pers; 2784 mddev->pers = pers;
2778 mddev->private = priv; 2785 mddev->private = priv;
2779 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 2786 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));