From 80c3a6ce4ba4470379b9e6a4d9bcd9d2ee26ae03 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 17 Mar 2009 18:10:40 -0700 Subject: md: add 'size' as a personality method 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 Signed-off-by: Dan Williams --- drivers/md/raid10.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) (limited to 'drivers/md/raid10.c') diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index c2059e25d03f..5bf1b24ae802 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -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) -- cgit v1.2.3