[PATCH] md: Split reshape handler in check_reshape and start_reshape
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>
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 089a326..355dafb 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2590,21 +2590,15 @@
}
#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 @@
* 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 @@
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 @@
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 @@
.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,
};