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md/raid10: Remove extras after reshape to smaller number of devices. 

When a reshape which reduced the number of devices finishes
we must remove the extra devices.

So ensure  that raid10_remove_disk won't try to keep them, and
have raid10_finish_reshape clear the 'in_sync' flag.  Then
remove_and_add_spares will be able to remove them.

Reported-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2012-05-22 13:55:33 +10:00
parent da7613b8b0
commit 63aced6102
1 changed files with 13 additions and 0 deletions
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13
drivers/md/raid10.c
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@ -1731,6 +1731,7 @@ static int raid10_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
if (!test_bit(Faulty, &rdev->flags) &&
mddev->recovery_disabled != p->recovery_disabled &&
(!p->replacement || p->replacement == rdev) &&
number < conf->geo.raid_disks &&
enough(conf, -1)) {
err = -EBUSY;
goto abort;
@ -4485,6 +4486,18 @@ static void raid10_finish_reshape(struct mddev *mddev)
mddev->resync_max_sectors = size;
set_capacity(mddev->gendisk, mddev->array_sectors);
revalidate_disk(mddev->gendisk);
} else {
int d;
for (d = conf->geo.raid_disks ;
d < conf->geo.raid_disks - mddev->delta_disks;
d++) {
struct md_rdev *rdev = conf->mirrors[d].rdev;
if (rdev)
clear_bit(In_sync, &rdev->flags);
rdev = conf->mirrors[d].replacement;
if (rdev)
clear_bit(In_sync, &rdev->flags);
}
}
mddev->layout = mddev->new_layout;
mddev->chunk_sectors = 1 << conf->geo.chunk_shift;