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md: add 'size' as a personality method

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In preparation for giving userspace control over ->array_sectors we need
to be able to retrieve the 'default' size, and the 'anticipated' size
when a reshape is requested.  For personalities that do not reshape emit
a warning if anything but the default size is requested.

In the raid5 case we need to update ->previous_raid_disks to make the
new 'default' size available.

Reviewed-by: Andre Noll <maan@systemlinux.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2009-03-17 18:10:40 -07:00
parent 93ed05e2a5
commit 80c3a6ce4b
8 changed files with 111 additions and 22 deletions
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14
drivers/md/faulty.c
View file

@ -283,6 +283,17 @@ static int reconfig(mddev_t *mddev, int layout, int chunk_size)
return 0;
}
static sector_t faulty_size(mddev_t *mddev, sector_t sectors, int raid_disks)
{
WARN_ONCE(raid_disks,
"%s does not support generic reshape\n", __func__);
if (sectors == 0)
return mddev->dev_sectors;
return sectors;
}
static int run(mddev_t *mddev)
{
mdk_rdev_t *rdev;
@ -301,7 +312,7 @@ static int run(mddev_t *mddev)
list_for_each_entry(rdev, &mddev->disks, same_set)
conf->rdev = rdev;
mddev->array_sectors = mddev->dev_sectors;
mddev->array_sectors = faulty_size(mddev, 0, 0);
mddev->private = conf;
reconfig(mddev, mddev->layout, -1);
@ -328,6 +339,7 @@ static struct mdk_personality faulty_personality =
.stop = stop,
.status = status,
.reconfig = reconfig,
.size = faulty_size,
};
static int __init raid_init(void)

15
drivers/md/linear.c
View file

@ -101,6 +101,16 @@ static int linear_congested(void *data, int bits)
return ret;
}
static sector_t linear_size(mddev_t *mddev, sector_t sectors, int raid_disks)
{
linear_conf_t *conf = mddev_to_conf(mddev);
WARN_ONCE(sectors || raid_disks,
"%s does not support generic reshape\n", __func__);
return conf->array_sectors;
}
static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
{
linear_conf_t *conf;
@ -253,7 +263,7 @@ static int linear_run (mddev_t *mddev)
if (!conf)
return 1;
mddev->private = conf;
mddev->array_sectors = conf->array_sectors;
mddev->array_sectors = linear_size(mddev, 0, 0);
blk_queue_merge_bvec(mddev->queue, linear_mergeable_bvec);
mddev->queue->unplug_fn = linear_unplug;
@ -287,7 +297,7 @@ static int linear_add(mddev_t *mddev, mdk_rdev_t *rdev)
newconf->prev = mddev_to_conf(mddev);
mddev->private = newconf;
mddev->raid_disks++;
mddev->array_sectors = newconf->array_sectors;
mddev->array_sectors = linear_size(mddev, 0, 0);
set_capacity(mddev->gendisk, mddev->array_sectors);
return 0;
}
@ -385,6 +395,7 @@ static struct mdk_personality linear_personality =
.stop = linear_stop,
.status = linear_status,
.hot_add_disk = linear_add,
.size = linear_size,
};
static int __init linear_init (void)

1
drivers/md/md.h
View file

@ -312,6 +312,7 @@ 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);
sector_t (*size) (mddev_t *mddev, sector_t sectors, 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);

11
drivers/md/multipath.c
View file

@ -406,6 +406,14 @@ static void multipathd (mddev_t *mddev)
spin_unlock_irqrestore(&conf->device_lock, flags);
}
static sector_t multipath_size(mddev_t *mddev, sector_t sectors, int raid_disks)
{
WARN_ONCE(sectors || raid_disks,
"%s does not support generic reshape\n", __func__);
return mddev->dev_sectors;
}
static int multipath_run (mddev_t *mddev)
{
multipath_conf_t *conf;
@ -502,7 +510,7 @@ static int multipath_run (mddev_t *mddev)
/*
* Ok, everything is just fine now
*/
mddev->array_sectors = mddev->dev_sectors;
mddev->array_sectors = multipath_size(mddev, 0, 0);
mddev->queue->unplug_fn = multipath_unplug;
mddev->queue->backing_dev_info.congested_fn = multipath_congested;
@ -547,6 +555,7 @@ static struct mdk_personality multipath_personality =
.error_handler = multipath_error,
.hot_add_disk = multipath_add_disk,
.hot_remove_disk= multipath_remove_disk,
.size = multipath_size,
};
static int __init multipath_init (void)

20
drivers/md/raid0.c
View file

@ -263,12 +263,25 @@ static int raid0_mergeable_bvec(struct request_queue *q,
return max;
}
static sector_t raid0_size(mddev_t *mddev, sector_t sectors, int raid_disks)
{
sector_t array_sectors = 0;
mdk_rdev_t *rdev;
WARN_ONCE(sectors || raid_disks,
"%s does not support generic reshape\n", __func__);
list_for_each_entry(rdev, &mddev->disks, same_set)
array_sectors += rdev->sectors;
return array_sectors;
}
static int raid0_run (mddev_t *mddev)
{
unsigned cur=0, i=0, nb_zone;
s64 sectors;
raid0_conf_t *conf;
mdk_rdev_t *rdev;
if (mddev->chunk_size == 0) {
printk(KERN_ERR "md/raid0: non-zero chunk size required.\n");
@ -293,9 +306,7 @@ static int raid0_run (mddev_t *mddev)
goto out_free_conf;
/* calculate array device size */
mddev->array_sectors = 0;
list_for_each_entry(rdev, &mddev->disks, same_set)
mddev->array_sectors += rdev->sectors;
mddev->array_sectors = raid0_size(mddev, 0, 0);
printk(KERN_INFO "raid0 : md_size is %llu sectors.\n",
(unsigned long long)mddev->array_sectors);
@ -511,6 +522,7 @@ static struct mdk_personality raid0_personality=
.run = raid0_run,
.stop = raid0_stop,
.status = raid0_status,
.size = raid0_size,
};
static int __init raid0_init (void)

13
drivers/md/raid1.c
View file

@ -1922,6 +1922,14 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
return nr_sectors;
}
static sector_t raid1_size(mddev_t *mddev, sector_t sectors, int raid_disks)
{
if (sectors)
return sectors;
return mddev->dev_sectors;
}
static int run(mddev_t *mddev)
{
conf_t *conf;
@ -2051,7 +2059,7 @@ static int run(mddev_t *mddev)
/*
* Ok, everything is just fine now
*/
mddev->array_sectors = mddev->dev_sectors;
mddev->array_sectors = raid1_size(mddev, 0, 0);
mddev->queue->unplug_fn = raid1_unplug;
mddev->queue->backing_dev_info.congested_fn = raid1_congested;
@ -2116,7 +2124,7 @@ static int raid1_resize(mddev_t *mddev, sector_t sectors)
* any io in the removed space completes, but it hardly seems
* worth it.
*/
mddev->array_sectors = sectors;
mddev->array_sectors = raid1_size(mddev, sectors, 0);
set_capacity(mddev->gendisk, mddev->array_sectors);
mddev->changed = 1;
if (mddev->array_sectors > mddev->dev_sectors &&
@ -2270,6 +2278,7 @@ static struct mdk_personality raid1_personality =
.spare_active = raid1_spare_active,
.sync_request = sync_request,
.resize = raid1_resize,
.size = raid1_size,
.check_reshape = raid1_reshape,
.quiesce = raid1_quiesce,
};

24
drivers/md/raid10.c
View file

@ -2023,6 +2023,25 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
goto skipped;
}
static sector_t
raid10_size(mddev_t *mddev, sector_t sectors, int raid_disks)
{
sector_t size;
conf_t *conf = mddev_to_conf(mddev);
if (!raid_disks)
raid_disks = mddev->raid_disks;
if (!sectors)
sectors = mddev->dev_sectors;
size = sectors >> conf->chunk_shift;
sector_div(size, conf->far_copies);
size = size * raid_disks;
sector_div(size, conf->near_copies);
return size << conf->chunk_shift;
}
static int run(mddev_t *mddev)
{
conf_t *conf;
@ -2174,8 +2193,8 @@ static int run(mddev_t *mddev)
/*
* Ok, everything is just fine now
*/
mddev->array_sectors = size << conf->chunk_shift;
mddev->resync_max_sectors = size << conf->chunk_shift;
mddev->array_sectors = raid10_size(mddev, 0, 0);
mddev->resync_max_sectors = mddev->array_sectors;
mddev->queue->unplug_fn = raid10_unplug;
mddev->queue->backing_dev_info.congested_fn = raid10_congested;
@ -2261,6 +2280,7 @@ static struct mdk_personality raid10_personality =
.spare_active = raid10_spare_active,
.sync_request = sync_request,
.quiesce = raid10_quiesce,
.size = raid10_size,
};
static int __init raid_init(void)

35
drivers/md/raid5.c
View file

@ -4166,6 +4166,20 @@ static struct attribute_group raid5_attrs_group = {
.attrs = raid5_attrs,
};
static sector_t
raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks)
{
raid5_conf_t *conf = mddev_to_conf(mddev);
if (!sectors)
sectors = mddev->dev_sectors;
if (!raid_disks)
raid_disks = conf->previous_raid_disks;
sectors &= ~((sector_t)mddev->chunk_size/512 - 1);
return sectors * (raid_disks - conf->max_degraded);
}
static raid5_conf_t *setup_conf(mddev_t *mddev)
{
raid5_conf_t *conf;
@ -4460,8 +4474,7 @@ static int run(mddev_t *mddev)
mddev->queue->backing_dev_info.congested_data = mddev;
mddev->queue->backing_dev_info.congested_fn = raid5_congested;
mddev->array_sectors = mddev->dev_sectors *
(conf->previous_raid_disks - conf->max_degraded);
mddev->array_sectors = raid5_size(mddev, 0, 0);
blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec);
@ -4684,11 +4697,8 @@ static int raid5_resize(mddev_t *mddev, sector_t sectors)
* any io in the removed space completes, but it hardly seems
* worth it.
*/
raid5_conf_t *conf = mddev_to_conf(mddev);
sectors &= ~((sector_t)mddev->chunk_size/512 - 1);
mddev->array_sectors = sectors * (mddev->raid_disks
- conf->max_degraded);
mddev->array_sectors = raid5_size(mddev, sectors, mddev->raid_disks);
set_capacity(mddev->gendisk, mddev->array_sectors);
mddev->changed = 1;
if (sectors > mddev->dev_sectors && mddev->recovery_cp == MaxSector) {
@ -4824,10 +4834,12 @@ static void end_reshape(raid5_conf_t *conf)
struct block_device *bdev;
if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) {
conf->mddev->array_sectors = conf->mddev->dev_sectors *
(conf->raid_disks - conf->max_degraded);
set_capacity(conf->mddev->gendisk, conf->mddev->array_sectors);
conf->mddev->changed = 1;
mddev_t *mddev = conf->mddev;
mddev->array_sectors = raid5_size(mddev, 0, conf->raid_disks);
set_capacity(mddev->gendisk, mddev->array_sectors);
mddev->changed = 1;
conf->previous_raid_disks = conf->raid_disks;
bdev = bdget_disk(conf->mddev->gendisk, 0);
if (bdev) {
@ -5076,6 +5088,7 @@ static struct mdk_personality raid6_personality =
.spare_active = raid5_spare_active,
.sync_request = sync_request,
.resize = raid5_resize,
.size = raid5_size,
#ifdef CONFIG_MD_RAID5_RESHAPE
.check_reshape = raid5_check_reshape,
.start_reshape = raid5_start_reshape,
@ -5098,6 +5111,7 @@ static struct mdk_personality raid5_personality =
.spare_active = raid5_spare_active,
.sync_request = sync_request,
.resize = raid5_resize,
.size = raid5_size,
#ifdef CONFIG_MD_RAID5_RESHAPE
.check_reshape = raid5_check_reshape,
.start_reshape = raid5_start_reshape,
@ -5122,6 +5136,7 @@ static struct mdk_personality raid4_personality =
.spare_active = raid5_spare_active,
.sync_request = sync_request,
.resize = raid5_resize,
.size = raid5_size,
#ifdef CONFIG_MD_RAID5_RESHAPE
.check_reshape = raid5_check_reshape,
.start_reshape = raid5_start_reshape,