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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
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@@ -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)