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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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11
drivers/md/multipath.c
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@@ -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)