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md: when a level change reduces the number of devices, remove the excess.

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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>
This commit is contained in:
NeilBrown 2009-08-03 10:59:55 +10:00
parent ac5e7113e7
commit 3a981b03f3
1 changed files with 7 additions and 0 deletions
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7
drivers/md/md.c
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@ -2695,6 +2695,7 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
ssize_t rv = len;
struct mdk_personality *pers;
void *priv;
mdk_rdev_t *rdev;
if (mddev->pers == NULL) {
if (len == 0)
@ -2774,6 +2775,12 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
mddev_suspend(mddev);
mddev->pers->stop(mddev);
module_put(mddev->pers->owner);
/* Invalidate devices that are now superfluous */
list_for_each_entry(rdev, &mddev->disks, same_set)
if (rdev->raid_disk >= mddev->raid_disks) {
rdev->raid_disk = -1;
clear_bit(In_sync, &rdev->flags);
}
mddev->pers = pers;
mddev->private = priv;
strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));