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[PATCH] md: Split reshape handler in check_reshape and start_reshape

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check_reshape checks validity and does things that can be done instantly -
like adding devices to raid1.  start_reshape initiates a restriping process to
convert the whole array.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown
2006-03-27 01:18:13 -08:00
committed by Linus Torvalds
parent b578d55fdd
commit 63c70c4f3a
4 changed files with 58 additions and 34 deletions
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60
drivers/md/raid5.c
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@@ -2590,21 +2590,15 @@ static int raid5_resize(mddev_t *mddev, sector_t sectors)
}
#ifdef CONFIG_MD_RAID5_RESHAPE
static int raid5_reshape(mddev_t *mddev, int raid_disks)
static int raid5_check_reshape(mddev_t *mddev)
{
raid5_conf_t *conf = mddev_to_conf(mddev);
int err;
mdk_rdev_t *rdev;
struct list_head *rtmp;
int spares = 0;
int added_devices = 0;
if (mddev->degraded ||
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return -EBUSY;
if (conf->raid_disks > raid_disks)
return -EINVAL; /* Cannot shrink array yet */
if (conf->raid_disks == raid_disks)
if (mddev->delta_disks < 0 ||
mddev->new_level != mddev->level)
return -EINVAL; /* Cannot shrink array or change level yet */
if (mddev->delta_disks == 0)
return 0; /* nothing to do */
/* Can only proceed if there are plenty of stripe_heads.
@@ -2615,30 +2609,48 @@ static int raid5_reshape(mddev_t *mddev, int raid_disks)
* If the chunk size is greater, user-space should request more
* stripe_heads first.
*/
if ((mddev->chunk_size / STRIPE_SIZE) * 4 > conf->max_nr_stripes) {
if ((mddev->chunk_size / STRIPE_SIZE) * 4 > conf->max_nr_stripes ||
(mddev->new_chunk / STRIPE_SIZE) * 4 > conf->max_nr_stripes) {
printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n",
(mddev->chunk_size / STRIPE_SIZE)*4);
return -ENOSPC;
}
err = resize_stripes(conf, conf->raid_disks + mddev->delta_disks);
if (err)
return err;
/* looks like we might be able to manage this */
return 0;
}
static int raid5_start_reshape(mddev_t *mddev)
{
raid5_conf_t *conf = mddev_to_conf(mddev);
mdk_rdev_t *rdev;
struct list_head *rtmp;
int spares = 0;
int added_devices = 0;
if (mddev->degraded ||
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return -EBUSY;
ITERATE_RDEV(mddev, rdev, rtmp)
if (rdev->raid_disk < 0 &&
!test_bit(Faulty, &rdev->flags))
spares++;
if (conf->raid_disks + spares < raid_disks-1)
if (spares < mddev->delta_disks-1)
/* Not enough devices even to make a degraded array
* of that size
*/
return -EINVAL;
err = resize_stripes(conf, raid_disks);
if (err)
return err;
atomic_set(&conf->reshape_stripes, 0);
spin_lock_irq(&conf->device_lock);
conf->previous_raid_disks = conf->raid_disks;
conf->raid_disks = raid_disks;
conf->raid_disks += mddev->delta_disks;
conf->expand_progress = 0;
conf->expand_lo = 0;
spin_unlock_irq(&conf->device_lock);
@@ -2660,12 +2672,8 @@ static int raid5_reshape(mddev_t *mddev, int raid_disks)
break;
}
mddev->degraded = (raid_disks - conf->previous_raid_disks) - added_devices;
mddev->new_chunk = mddev->chunk_size;
mddev->new_layout = mddev->layout;
mddev->new_level = mddev->level;
mddev->raid_disks = raid_disks;
mddev->delta_disks = raid_disks - conf->previous_raid_disks;
mddev->degraded = (conf->raid_disks - conf->previous_raid_disks) - added_devices;
mddev->raid_disks = conf->raid_disks;
mddev->reshape_position = 0;
mddev->sb_dirty = 1;
@@ -2679,7 +2687,6 @@ static int raid5_reshape(mddev_t *mddev, int raid_disks)
mddev->recovery = 0;
spin_lock_irq(&conf->device_lock);
mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks;
mddev->delta_disks = 0;
conf->expand_progress = MaxSector;
spin_unlock_irq(&conf->device_lock);
return -EAGAIN;
@@ -2752,7 +2759,8 @@ static struct mdk_personality raid5_personality =
.sync_request = sync_request,
.resize = raid5_resize,
#ifdef CONFIG_MD_RAID5_RESHAPE
.reshape = raid5_reshape,
.check_reshape = raid5_check_reshape,
.start_reshape = raid5_start_reshape,
#endif
.quiesce = raid5_quiesce,
};