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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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20
drivers/md/raid0.c
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@@ -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)