md/raid10: split out interpretation of layout to separate function.
We will soon be interpreting the layout (and chunksize etc) from multiple places to support reshape. So split it out into separate function. Signed-off-by: NeilBrown <neilb@suse.de>
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deb200d085
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@ -3253,26 +3253,64 @@ static void calc_sectors(struct r10conf *conf, sector_t size)
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}
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}
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enum geo_type {geo_new, geo_old, geo_start};
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static int setup_geo(struct geom *geo, struct mddev *mddev, enum geo_type new)
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{
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int nc, fc, fo;
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int layout, chunk, disks;
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switch (new) {
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case geo_old:
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layout = mddev->layout;
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chunk = mddev->chunk_sectors;
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disks = mddev->raid_disks - mddev->delta_disks;
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break;
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case geo_new:
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layout = mddev->new_layout;
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chunk = mddev->new_chunk_sectors;
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disks = mddev->raid_disks;
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break;
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default: /* avoid 'may be unused' warnings */
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case geo_start: /* new when starting reshape - raid_disks not
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* updated yet. */
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layout = mddev->new_layout;
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chunk = mddev->new_chunk_sectors;
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disks = mddev->raid_disks + mddev->delta_disks;
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break;
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}
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if (layout >> 17)
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return -1;
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if (chunk < (PAGE_SIZE >> 9) ||
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!is_power_of_2(chunk))
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return -2;
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nc = layout & 255;
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fc = (layout >> 8) & 255;
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fo = layout & (1<<16);
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geo->raid_disks = disks;
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geo->near_copies = nc;
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geo->far_copies = fc;
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geo->far_offset = fo;
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geo->chunk_mask = chunk - 1;
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geo->chunk_shift = ffz(~chunk);
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return nc*fc;
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}
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static struct r10conf *setup_conf(struct mddev *mddev)
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{
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struct r10conf *conf = NULL;
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int nc, fc, fo;
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int err = -EINVAL;
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struct geom geo;
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int copies;
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if (mddev->new_chunk_sectors < (PAGE_SIZE >> 9) ||
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!is_power_of_2(mddev->new_chunk_sectors)) {
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copies = setup_geo(&geo, mddev, geo_new);
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if (copies == -2) {
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printk(KERN_ERR "md/raid10:%s: chunk size must be "
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"at least PAGE_SIZE(%ld) and be a power of 2.\n",
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mdname(mddev), PAGE_SIZE);
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goto out;
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}
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nc = mddev->new_layout & 255;
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fc = (mddev->new_layout >> 8) & 255;
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fo = mddev->new_layout & (1<<16);
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if ((nc*fc) <2 || (nc*fc) > mddev->raid_disks ||
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(mddev->new_layout >> 17)) {
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if (copies < 2 || copies > mddev->raid_disks) {
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printk(KERN_ERR "md/raid10:%s: unsupported raid10 layout: 0x%8x\n",
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mdname(mddev), mddev->new_layout);
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goto out;
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@ -3292,15 +3330,8 @@ static struct r10conf *setup_conf(struct mddev *mddev)
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if (!conf->tmppage)
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goto out;
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conf->geo.raid_disks = mddev->raid_disks;
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conf->geo.near_copies = nc;
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conf->geo.far_copies = fc;
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conf->copies = nc*fc;
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conf->geo.far_offset = fo;
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conf->geo.chunk_mask = mddev->new_chunk_sectors - 1;
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conf->geo.chunk_shift = ffz(~mddev->new_chunk_sectors);
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conf->geo = geo;
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conf->copies = copies;
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conf->r10bio_pool = mempool_create(NR_RAID10_BIOS, r10bio_pool_alloc,
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r10bio_pool_free, conf);
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if (!conf->r10bio_pool)
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