diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2009-03-17 18:10:40 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-03-31 14:57:49 +1100 |
| commit | 80c3a6ce4ba4470379b9e6a4d9bcd9d2ee26ae03 (patch) | |
| tree | de88622f05a7e681ac7bff7714e8f2d8953b66ac /drivers/md/raid10.c | |
| parent | 93ed05e2a56b5ee06c0100a169433b11c4aa5d0b (diff) | |
| download | linux-80c3a6ce4ba4470379b9e6a4d9bcd9d2ee26ae03.tar.bz2 | |
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 <maan@systemlinux.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/md/raid10.c')
| -rw-r--r-- | drivers/md/raid10.c | 24 |
1 files changed, 22 insertions, 2 deletions
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) |