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 <[email protected]>
### Diffstat output
./drivers/md/md.c | 10 ++++---
./drivers/md/raid1.c | 19 +++++++++++--
./drivers/md/raid5.c | 60 ++++++++++++++++++++++++--------------------
./include/linux/raid/md_k.h | 3 +-
4 files changed, 58 insertions(+), 34 deletions(-)
diff ./drivers/md/md.c~current~ ./drivers/md/md.c
--- ./drivers/md/md.c~current~ 2006-03-17 11:48:58.000000000 +1100
+++ ./drivers/md/md.c 2006-03-17 11:48:59.000000000 +1100
@@ -2589,7 +2589,7 @@ static int do_md_run(mddev_t * mddev)
strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
if (mddev->reshape_position != MaxSector &&
- pers->reshape == NULL) {
+ pers->start_reshape == NULL) {
/* This personality cannot handle reshaping... */
mddev->pers = NULL;
module_put(pers->owner);
@@ -3551,14 +3551,16 @@ static int update_raid_disks(mddev_t *md
{
int rv;
/* change the number of raid disks */
- if (mddev->pers->reshape == NULL)
+ if (mddev->pers->check_reshape == NULL)
return -EINVAL;
if (raid_disks <= 0 ||
raid_disks >= mddev->max_disks)
return -EINVAL;
- if (mddev->sync_thread)
+ if (mddev->sync_thread || mddev->reshape_position != MaxSector)
return -EBUSY;
- rv = mddev->pers->reshape(mddev, raid_disks);
+ mddev->delta_disks = raid_disks - mddev->raid_disks;
+
+ rv = mddev->pers->check_reshape(mddev);
return rv;
}
diff ./drivers/md/raid1.c~current~ ./drivers/md/raid1.c
--- ./drivers/md/raid1.c~current~ 2006-03-17 11:48:58.000000000 +1100
+++ ./drivers/md/raid1.c 2006-03-17 11:48:59.000000000 +1100
@@ -1976,7 +1976,7 @@ static int raid1_resize(mddev_t *mddev,
return 0;
}
-static int raid1_reshape(mddev_t *mddev, int raid_disks)
+static int raid1_reshape(mddev_t *mddev)
{
/* We need to:
* 1/ resize the r1bio_pool
@@ -1993,10 +1993,22 @@ static int raid1_reshape(mddev_t *mddev,
struct pool_info *newpoolinfo;
mirror_info_t *newmirrors;
conf_t *conf = mddev_to_conf(mddev);
- int cnt;
+ int cnt, raid_disks;
int d, d2;
+ /* Cannot change chunk_size, layout, or level */
+ if (mddev->chunk_size != mddev->new_chunk ||
+ mddev->layout != mddev->new_layout ||
+ mddev->level != mddev->new_level) {
+ mddev->new_chunk = mddev->chunk_size;
+ mddev->new_layout = mddev->layout;
+ mddev->new_level = mddev->level;
+ return -EINVAL;
+ }
+
+ raid_disks = mddev->raid_disks + mddev->delta_disks;
+
if (raid_disks < conf->raid_disks) {
cnt=0;
for (d= 0; d < conf->raid_disks; d++)
@@ -2043,6 +2055,7 @@ static int raid1_reshape(mddev_t *mddev,
mddev->degraded += (raid_disks - conf->raid_disks);
conf->raid_disks = mddev->raid_disks = raid_disks;
+ mddev->delta_disks = 0;
conf->last_used = 0; /* just make sure it is in-range */
lower_barrier(conf);
@@ -2084,7 +2097,7 @@ static struct mdk_personality raid1_pers
.spare_active = raid1_spare_active,
.sync_request = sync_request,
.resize = raid1_resize,
- .reshape = raid1_reshape,
+ .check_reshape = raid1_reshape,
.quiesce = raid1_quiesce,
};
diff ./drivers/md/raid5.c~current~ ./drivers/md/raid5.c
--- ./drivers/md/raid5.c~current~ 2006-03-17 11:48:58.000000000 +1100
+++ ./drivers/md/raid5.c 2006-03-17 11:48:59.000000000 +1100
@@ -2574,21 +2574,15 @@ static int raid5_resize(mddev_t *mddev,
return 0;
}
-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.
@@ -2599,30 +2593,48 @@ static int raid5_reshape(mddev_t *mddev,
* 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);
@@ -2644,12 +2656,8 @@ static int raid5_reshape(mddev_t *mddev,
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;
@@ -2663,7 +2671,6 @@ static int raid5_reshape(mddev_t *mddev,
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;
@@ -2735,7 +2742,8 @@ static struct mdk_personality raid5_pers
.sync_request = sync_request,
.resize = raid5_resize,
#if CONFIG_MD_RAID5_RESHAPE
- .reshape = raid5_reshape,
+ .check_reshape = raid5_check_reshape,
+ .start_reshape = raid5_start_reshape,
#endif
.quiesce = raid5_quiesce,
};
diff ./include/linux/raid/md_k.h~current~ ./include/linux/raid/md_k.h
--- ./include/linux/raid/md_k.h~current~ 2006-03-17 11:48:58.000000000 +1100
+++ ./include/linux/raid/md_k.h 2006-03-17 11:48:59.000000000 +1100
@@ -261,7 +261,8 @@ struct mdk_personality
int (*spare_active) (mddev_t *mddev);
sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster);
int (*resize) (mddev_t *mddev, sector_t sectors);
- int (*reshape) (mddev_t *mddev, int raid_disks);
+ int (*check_reshape) (mddev_t *mddev);
+ int (*start_reshape) (mddev_t *mddev);
int (*reconfig) (mddev_t *mddev, int layout, int chunk_size);
/* quiesce moves between quiescence states
* 0 - fully active
-
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