drivers/md/raid0.c

42 	pr_debug("md: RAID0 configuration for %s - %d zone%s\n",
52 		pr_debug("md: zone%d=[%s]\n", j, line);
55 		pr_debug("      zone-offset=%10lluKB, device-offset=%10lluKB, size=%10lluKB\n",
68 	struct strip_zone *zone;
152 	/* The first zone must contain all devices, so here we check that
155 	zone = &conf->strip_zone[0];
203 	zone->nb_dev = cnt;
204 	zone->zone_end = smallest->sectors * cnt;
206 	curr_zone_end = zone->zone_end;
213 		zone = conf->strip_zone + i;
216 		pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i);
217 		zone->dev_start = smallest->sectors;
223 			if (rdev->sectors <= zone->dev_start) {
243 		zone->nb_dev = c;
244 		sectors = (smallest->sectors - zone->dev_start) * c;
245 		pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n",
247 			 zone->nb_dev, (unsigned long long)sectors);
250 		zone->zone_end = curr_zone_end;
252 		pr_debug("md/raid0:%s: current zone start: %llu\n",
266 		pr_err("md/raid0:%s: cannot assemble multi-zone RAID0 with default_layout setting\n",
278 			zone = conf->strip_zone + i;
279 			/* disk_shift is first disk index used in the zone */
280 			zone->disk_shift = sector_div(first_sector,
281 						      zone->nb_dev);
297 /* Find the zone which holds a particular offset
298  * Update *sectorp to be an offset in that zone
320 static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone,
334 		/* chunk in zone */
337 		sector_div(chunk, zone->nb_dev << chunksect_bits);
341 		sector_div(chunk, chunk_sects * zone->nb_dev);
345 	*  real sector = chunk in device + starting of zone
349 	return conf->devlist[(zone - conf->strip_zone)*raid_disks
350 			     + sector_div(sector, zone->nb_dev)];
456 	struct strip_zone *zone;
469 	zone = find_zone(conf, &start);
471 	if (bio_end_sector(bio) > zone->zone_end) {
473 			zone->zone_end - bio->bi_iter.bi_sector, GFP_NOIO,
478 		end = zone->zone_end;
483 	if (zone != conf->strip_zone)
484 		end = end - zone[-1].zone_end;
486 	/* Now start and end is the offset in zone */
487 	stripe_size = zone->nb_dev * mddev->chunk_sectors;
494 	/* In the first zone the original and alternate layouts are the same */
495 	if ((conf->layout == RAID0_ORIG_LAYOUT) && (zone != conf->strip_zone)) {
497 		start_disk_index = sector_div(orig_start, zone->nb_dev);
499 						  zone->nb_dev,
500 						  zone->disk_shift);
502 		end_disk_index = sector_div(orig_end, zone->nb_dev);
504 						zone->nb_dev, zone->disk_shift);
518 	for (disk = 0; disk < zone->nb_dev; disk++) {
523 		compare_disk = map_disk_shift(disk, zone->nb_dev,
524 					      zone->disk_shift);
544 		rdev = conf->devlist[(zone - conf->strip_zone) *
547 			dev_start + zone->dev_start + rdev->data_offset,
556 	struct strip_zone *zone;
563 	zone = find_zone(mddev->private, &sector);
566 		tmp_dev = map_sector(mddev, zone, bio_sector, &sector);
569 		tmp_dev = map_sector(mddev, zone, sector, &sector);
584 	bio->bi_iter.bi_sector = sector + zone->dev_start +