diff options
Diffstat (limited to 'drivers/md/raid0.c')
| -rw-r--r-- | drivers/md/raid0.c | 538 |
1 files changed, 289 insertions, 249 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index a39f4c355e5..407a99e46f6 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -20,31 +20,17 @@ #include <linux/blkdev.h> #include <linux/seq_file.h> +#include <linux/module.h> #include <linux/slab.h> #include "md.h" #include "raid0.h" #include "raid5.h" -static void raid0_unplug(struct request_queue *q) -{ - mddev_t *mddev = q->queuedata; - raid0_conf_t *conf = mddev->private; - mdk_rdev_t **devlist = conf->devlist; - int raid_disks = conf->strip_zone[0].nb_dev; - int i; - - for (i=0; i < raid_disks; i++) { - struct request_queue *r_queue = bdev_get_queue(devlist[i]->bdev); - - blk_unplug(r_queue); - } -} - static int raid0_congested(void *data, int bits) { - mddev_t *mddev = data; - raid0_conf_t *conf = mddev->private; - mdk_rdev_t **devlist = conf->devlist; + struct mddev *mddev = data; + struct r0conf *conf = mddev->private; + struct md_rdev **devlist = conf->devlist; int raid_disks = conf->strip_zone[0].nb_dev; int i, ret = 0; @@ -62,52 +48,54 @@ static int raid0_congested(void *data, int bits) /* * inform the user of the raid configuration */ -static void dump_zones(mddev_t *mddev) +static void dump_zones(struct mddev *mddev) { - int j, k, h; + int j, k; sector_t zone_size = 0; sector_t zone_start = 0; char b[BDEVNAME_SIZE]; - raid0_conf_t *conf = mddev->private; + struct r0conf *conf = mddev->private; int raid_disks = conf->strip_zone[0].nb_dev; - printk(KERN_INFO "******* %s configuration *********\n", - mdname(mddev)); - h = 0; + printk(KERN_INFO "md: RAID0 configuration for %s - %d zone%s\n", + mdname(mddev), + conf->nr_strip_zones, conf->nr_strip_zones==1?"":"s"); for (j = 0; j < conf->nr_strip_zones; j++) { - printk(KERN_INFO "zone%d=[", j); + printk(KERN_INFO "md: zone%d=[", j); for (k = 0; k < conf->strip_zone[j].nb_dev; k++) - printk(KERN_CONT "%s/", + printk(KERN_CONT "%s%s", k?"/":"", bdevname(conf->devlist[j*raid_disks + k]->bdev, b)); printk(KERN_CONT "]\n"); zone_size = conf->strip_zone[j].zone_end - zone_start; - printk(KERN_INFO " zone offset=%llukb " - "device offset=%llukb size=%llukb\n", + printk(KERN_INFO " zone-offset=%10lluKB, " + "device-offset=%10lluKB, size=%10lluKB\n", (unsigned long long)zone_start>>1, (unsigned long long)conf->strip_zone[j].dev_start>>1, (unsigned long long)zone_size>>1); zone_start = conf->strip_zone[j].zone_end; } - printk(KERN_INFO "**********************************\n\n"); + printk(KERN_INFO "\n"); } -static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf) +static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf) { int i, c, err; sector_t curr_zone_end, sectors; - mdk_rdev_t *smallest, *rdev1, *rdev2, *rdev, **dev; + struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev; struct strip_zone *zone; int cnt; char b[BDEVNAME_SIZE]; - raid0_conf_t *conf = kzalloc(sizeof(*conf), GFP_KERNEL); + char b2[BDEVNAME_SIZE]; + struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL); + bool discard_supported = false; if (!conf) return -ENOMEM; - list_for_each_entry(rdev1, &mddev->disks, same_set) { - printk(KERN_INFO "md/raid0:%s: looking at %s\n", - mdname(mddev), - bdevname(rdev1->bdev, b)); + rdev_for_each(rdev1, mddev) { + pr_debug("md/raid0:%s: looking at %s\n", + mdname(mddev), + bdevname(rdev1->bdev, b)); c = 0; /* round size to chunk_size */ @@ -115,17 +103,17 @@ static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf) sector_div(sectors, mddev->chunk_sectors); rdev1->sectors = sectors * mddev->chunk_sectors; - list_for_each_entry(rdev2, &mddev->disks, same_set) { - printk(KERN_INFO "md/raid0:%s: comparing %s(%llu)", - mdname(mddev), - bdevname(rdev1->bdev,b), - (unsigned long long)rdev1->sectors); - printk(KERN_CONT " with %s(%llu)\n", - bdevname(rdev2->bdev,b), - (unsigned long long)rdev2->sectors); + rdev_for_each(rdev2, mddev) { + pr_debug("md/raid0:%s: comparing %s(%llu)" + " with %s(%llu)\n", + mdname(mddev), + bdevname(rdev1->bdev,b), + (unsigned long long)rdev1->sectors, + bdevname(rdev2->bdev,b2), + (unsigned long long)rdev2->sectors); if (rdev2 == rdev1) { - printk(KERN_INFO "md/raid0:%s: END\n", - mdname(mddev)); + pr_debug("md/raid0:%s: END\n", + mdname(mddev)); break; } if (rdev2->sectors == rdev1->sectors) { @@ -133,30 +121,30 @@ static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf) * Not unique, don't count it as a new * group */ - printk(KERN_INFO "md/raid0:%s: EQUAL\n", - mdname(mddev)); + pr_debug("md/raid0:%s: EQUAL\n", + mdname(mddev)); c = 1; break; } - printk(KERN_INFO "md/raid0:%s: NOT EQUAL\n", - mdname(mddev)); + pr_debug("md/raid0:%s: NOT EQUAL\n", + mdname(mddev)); } if (!c) { - printk(KERN_INFO "md/raid0:%s: ==> UNIQUE\n", - mdname(mddev)); + pr_debug("md/raid0:%s: ==> UNIQUE\n", + mdname(mddev)); conf->nr_strip_zones++; - printk(KERN_INFO "md/raid0:%s: %d zones\n", - mdname(mddev), conf->nr_strip_zones); + pr_debug("md/raid0:%s: %d zones\n", + mdname(mddev), conf->nr_strip_zones); } } - printk(KERN_INFO "md/raid0:%s: FINAL %d zones\n", - mdname(mddev), conf->nr_strip_zones); + pr_debug("md/raid0:%s: FINAL %d zones\n", + mdname(mddev), conf->nr_strip_zones); err = -ENOMEM; conf->strip_zone = kzalloc(sizeof(struct strip_zone)* conf->nr_strip_zones, GFP_KERNEL); if (!conf->strip_zone) goto abort; - conf->devlist = kzalloc(sizeof(mdk_rdev_t*)* + conf->devlist = kzalloc(sizeof(struct md_rdev*)* conf->nr_strip_zones*mddev->raid_disks, GFP_KERNEL); if (!conf->devlist) @@ -170,7 +158,7 @@ static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf) smallest = NULL; dev = conf->devlist; err = -EINVAL; - list_for_each_entry(rdev1, &mddev->disks, same_set) { + rdev_for_each(rdev1, mddev) { int j = rdev1->raid_disk; if (mddev->level == 10) { @@ -179,7 +167,21 @@ static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf) rdev1->new_raid_disk = j; } - if (j < 0 || j >= mddev->raid_disks) { + if (mddev->level == 1) { + /* taiking over a raid1 array- + * we have only one active disk + */ + j = 0; + rdev1->new_raid_disk = j; + } + + if (j < 0) { + printk(KERN_ERR + "md/raid0:%s: remove inactive devices before converting to RAID0\n", + mdname(mddev)); + goto abort; + } + if (j >= mddev->raid_disks) { printk(KERN_ERR "md/raid0:%s: bad disk number %d - " "aborting!\n", mdname(mddev), j); goto abort; @@ -193,19 +195,16 @@ static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf) disk_stack_limits(mddev->gendisk, rdev1->bdev, rdev1->data_offset << 9); - /* as we don't honour merge_bvec_fn, we must never risk - * violating it, so limit ->max_segments to 1, lying within - * a single page. - */ - - if (rdev1->bdev->bd_disk->queue->merge_bvec_fn) { - blk_queue_max_segments(mddev->queue, 1); - blk_queue_segment_boundary(mddev->queue, - PAGE_CACHE_SIZE - 1); - } + + if (rdev1->bdev->bd_disk->queue->merge_bvec_fn) + conf->has_merge_bvec = 1; + if (!smallest || (rdev1->sectors < smallest->sectors)) smallest = rdev1; cnt++; + + if (blk_queue_discard(bdev_get_queue(rdev1->bdev))) + discard_supported = true; } if (cnt != mddev->raid_disks) { printk(KERN_ERR "md/raid0:%s: too few disks (%d of %d) - " @@ -225,46 +224,46 @@ static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf) zone = conf->strip_zone + i; dev = conf->devlist + i * mddev->raid_disks; - printk(KERN_INFO "md/raid0:%s: zone %d\n", - mdname(mddev), i); + pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i); zone->dev_start = smallest->sectors; smallest = NULL; c = 0; for (j=0; j<cnt; j++) { rdev = conf->devlist[j]; - printk(KERN_INFO "md/raid0:%s: checking %s ...", - mdname(mddev), - bdevname(rdev->bdev, b)); if (rdev->sectors <= zone->dev_start) { - printk(KERN_CONT " nope.\n"); + pr_debug("md/raid0:%s: checking %s ... nope\n", + mdname(mddev), + bdevname(rdev->bdev, b)); continue; } - printk(KERN_CONT " contained as device %d\n", c); + pr_debug("md/raid0:%s: checking %s ..." + " contained as device %d\n", + mdname(mddev), + bdevname(rdev->bdev, b), c); dev[c] = rdev; c++; if (!smallest || rdev->sectors < smallest->sectors) { smallest = rdev; - printk(KERN_INFO "md/raid0:%s: (%llu) is smallest!.\n", - mdname(mddev), - (unsigned long long)rdev->sectors); + pr_debug("md/raid0:%s: (%llu) is smallest!.\n", + mdname(mddev), + (unsigned long long)rdev->sectors); } } zone->nb_dev = c; sectors = (smallest->sectors - zone->dev_start) * c; - printk(KERN_INFO "md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n", - mdname(mddev), - zone->nb_dev, (unsigned long long)sectors); + pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n", + mdname(mddev), + zone->nb_dev, (unsigned long long)sectors); curr_zone_end += sectors; zone->zone_end = curr_zone_end; - printk(KERN_INFO "md/raid0:%s: current zone start: %llu\n", - mdname(mddev), - (unsigned long long)smallest->sectors); + pr_debug("md/raid0:%s: current zone start: %llu\n", + mdname(mddev), + (unsigned long long)smallest->sectors); } - mddev->queue->unplug_fn = raid0_unplug; mddev->queue->backing_dev_info.congested_fn = raid0_congested; mddev->queue->backing_dev_info.congested_data = mddev; @@ -283,7 +282,12 @@ static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf) blk_queue_io_opt(mddev->queue, (mddev->chunk_sectors << 9) * mddev->raid_disks); - printk(KERN_INFO "md/raid0:%s: done.\n", mdname(mddev)); + if (!discard_supported) + queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); + else + queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); + + pr_debug("md/raid0:%s: done.\n", mdname(mddev)); *private_conf = conf; return 0; @@ -291,12 +295,68 @@ abort: kfree(conf->strip_zone); kfree(conf->devlist); kfree(conf); - *private_conf = NULL; + *private_conf = ERR_PTR(err); return err; } +/* Find the zone which holds a particular offset + * Update *sectorp to be an offset in that zone + */ +static struct strip_zone *find_zone(struct r0conf *conf, + sector_t *sectorp) +{ + int i; + struct strip_zone *z = conf->strip_zone; + sector_t sector = *sectorp; + + for (i = 0; i < conf->nr_strip_zones; i++) + if (sector < z[i].zone_end) { + if (i) + *sectorp = sector - z[i-1].zone_end; + return z + i; + } + BUG(); +} + +/* + * remaps the bio to the target device. we separate two flows. + * power 2 flow and a general flow for the sake of perfromance +*/ +static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone, + sector_t sector, sector_t *sector_offset) +{ + unsigned int sect_in_chunk; + sector_t chunk; + struct r0conf *conf = mddev->private; + int raid_disks = conf->strip_zone[0].nb_dev; + unsigned int chunk_sects = mddev->chunk_sectors; + + if (is_power_of_2(chunk_sects)) { + int chunksect_bits = ffz(~chunk_sects); + /* find the sector offset inside the chunk */ + sect_in_chunk = sector & (chunk_sects - 1); + sector >>= chunksect_bits; + /* chunk in zone */ + chunk = *sector_offset; + /* quotient is the chunk in real device*/ + sector_div(chunk, zone->nb_dev << chunksect_bits); + } else{ + sect_in_chunk = sector_div(sector, chunk_sects); + chunk = *sector_offset; + sector_div(chunk, chunk_sects * zone->nb_dev); + } + /* + * position the bio over the real device + * real sector = chunk in device + starting of zone + * + the position in the chunk + */ + *sector_offset = (chunk * chunk_sects) + sect_in_chunk; + return conf->devlist[(zone - conf->strip_zone)*raid_disks + + sector_div(sector, zone->nb_dev)]; +} + /** - * raid0_mergeable_bvec -- tell bio layer if a two requests can be merged + * raid0_mergeable_bvec -- tell bio layer if two requests can be merged * @q: request queue * @bvm: properties of new bio * @biovec: the request that could be merged to it. @@ -307,11 +367,16 @@ static int raid0_mergeable_bvec(struct request_queue *q, struct bvec_merge_data *bvm, struct bio_vec *biovec) { - mddev_t *mddev = q->queuedata; + struct mddev *mddev = q->queuedata; + struct r0conf *conf = mddev->private; sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); + sector_t sector_offset = sector; int max; unsigned int chunk_sectors = mddev->chunk_sectors; unsigned int bio_sectors = bvm->bi_size >> 9; + struct strip_zone *zone; + struct md_rdev *rdev; + struct request_queue *subq; if (is_power_of_2(chunk_sectors)) max = (chunk_sectors - ((sector & (chunk_sectors-1)) @@ -319,30 +384,50 @@ static int raid0_mergeable_bvec(struct request_queue *q, else max = (chunk_sectors - (sector_div(sector, chunk_sectors) + bio_sectors)) << 9; - if (max < 0) max = 0; /* bio_add cannot handle a negative return */ + if (max < 0) + max = 0; /* bio_add cannot handle a negative return */ if (max <= biovec->bv_len && bio_sectors == 0) return biovec->bv_len; - else + if (max < biovec->bv_len) + /* too small already, no need to check further */ + return max; + if (!conf->has_merge_bvec) + return max; + + /* May need to check subordinate device */ + sector = sector_offset; + zone = find_zone(mddev->private, §or_offset); + rdev = map_sector(mddev, zone, sector, §or_offset); + subq = bdev_get_queue(rdev->bdev); + if (subq->merge_bvec_fn) { + bvm->bi_bdev = rdev->bdev; + bvm->bi_sector = sector_offset + zone->dev_start + + rdev->data_offset; + return min(max, subq->merge_bvec_fn(subq, bvm, biovec)); + } else return max; } -static sector_t raid0_size(mddev_t *mddev, sector_t sectors, int raid_disks) +static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks) { sector_t array_sectors = 0; - mdk_rdev_t *rdev; + struct md_rdev *rdev; WARN_ONCE(sectors || raid_disks, "%s does not support generic reshape\n", __func__); - list_for_each_entry(rdev, &mddev->disks, same_set) - array_sectors += rdev->sectors; + rdev_for_each(rdev, mddev) + array_sectors += (rdev->sectors & + ~(sector_t)(mddev->chunk_sectors-1)); return array_sectors; } -static int raid0_run(mddev_t *mddev) +static int raid0_stop(struct mddev *mddev); + +static int raid0_run(struct mddev *mddev) { - raid0_conf_t *conf; + struct r0conf *conf; int ret; if (mddev->chunk_sectors == 0) { @@ -353,7 +438,8 @@ static int raid0_run(mddev_t *mddev) if (md_check_no_bitmap(mddev)) return -EINVAL; blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors); - mddev->queue->queue_lock = &mddev->queue->__queue_lock; + blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors); + blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors); /* if private is not null, we are here after takeover */ if (mddev->private == NULL) { @@ -388,13 +474,17 @@ static int raid0_run(mddev_t *mddev) blk_queue_merge_bvec(mddev->queue, raid0_mergeable_bvec); dump_zones(mddev); - md_integrity_register(mddev); - return 0; + + ret = md_integrity_register(mddev); + if (ret) + raid0_stop(mddev); + + return ret; } -static int raid0_stop(mddev_t *mddev) +static int raid0_stop(struct mddev *mddev) { - raid0_conf_t *conf = mddev->private; + struct r0conf *conf = mddev->private; blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ kfree(conf->strip_zone); @@ -404,175 +494,75 @@ static int raid0_stop(mddev_t *mddev) return 0; } -/* Find the zone which holds a particular offset - * Update *sectorp to be an offset in that zone - */ -static struct strip_zone *find_zone(struct raid0_private_data *conf, - sector_t *sectorp) -{ - int i; - struct strip_zone *z = conf->strip_zone; - sector_t sector = *sectorp; - - for (i = 0; i < conf->nr_strip_zones; i++) - if (sector < z[i].zone_end) { - if (i) - *sectorp = sector - z[i-1].zone_end; - return z + i; - } - BUG(); -} - -/* - * remaps the bio to the target device. we separate two flows. - * power 2 flow and a general flow for the sake of perfromance -*/ -static mdk_rdev_t *map_sector(mddev_t *mddev, struct strip_zone *zone, - sector_t sector, sector_t *sector_offset) -{ - unsigned int sect_in_chunk; - sector_t chunk; - raid0_conf_t *conf = mddev->private; - int raid_disks = conf->strip_zone[0].nb_dev; - unsigned int chunk_sects = mddev->chunk_sectors; - - if (is_power_of_2(chunk_sects)) { - int chunksect_bits = ffz(~chunk_sects); - /* find the sector offset inside the chunk */ - sect_in_chunk = sector & (chunk_sects - 1); - sector >>= chunksect_bits; - /* chunk in zone */ - chunk = *sector_offset; - /* quotient is the chunk in real device*/ - sector_div(chunk, zone->nb_dev << chunksect_bits); - } else{ - sect_in_chunk = sector_div(sector, chunk_sects); - chunk = *sector_offset; - sector_div(chunk, chunk_sects * zone->nb_dev); - } - /* - * position the bio over the real device - * real sector = chunk in device + starting of zone - * + the position in the chunk - */ - *sector_offset = (chunk * chunk_sects) + sect_in_chunk; - return conf->devlist[(zone - conf->strip_zone)*raid_disks - + sector_div(sector, zone->nb_dev)]; -} - /* * Is io distribute over 1 or more chunks ? */ -static inline int is_io_in_chunk_boundary(mddev_t *mddev, +static inline int is_io_in_chunk_boundary(struct mddev *mddev, unsigned int chunk_sects, struct bio *bio) { if (likely(is_power_of_2(chunk_sects))) { - return chunk_sects >= ((bio->bi_sector & (chunk_sects-1)) - + (bio->bi_size >> 9)); + return chunk_sects >= + ((bio->bi_iter.bi_sector & (chunk_sects-1)) + + bio_sectors(bio)); } else{ - sector_t sector = bio->bi_sector; + sector_t sector = bio->bi_iter.bi_sector; return chunk_sects >= (sector_div(sector, chunk_sects) - + (bio->bi_size >> 9)); + + bio_sectors(bio)); } } -static int raid0_make_request(mddev_t *mddev, struct bio *bio) +static void raid0_make_request(struct mddev *mddev, struct bio *bio) { - unsigned int chunk_sects; - sector_t sector_offset; struct strip_zone *zone; - mdk_rdev_t *tmp_dev; + struct md_rdev *tmp_dev; + struct bio *split; if (unlikely(bio->bi_rw & REQ_FLUSH)) { md_flush_request(mddev, bio); - return 0; + return; } - chunk_sects = mddev->chunk_sectors; - if (unlikely(!is_io_in_chunk_boundary(mddev, chunk_sects, bio))) { - sector_t sector = bio->bi_sector; - struct bio_pair *bp; - /* Sanity check -- queue functions should prevent this happening */ - if (bio->bi_vcnt != 1 || - bio->bi_idx != 0) - goto bad_map; - /* This is a one page bio that upper layers - * refuse to split for us, so we need to split it. - */ - if (likely(is_power_of_2(chunk_sects))) - bp = bio_split(bio, chunk_sects - (sector & - (chunk_sects-1))); - else - bp = bio_split(bio, chunk_sects - - sector_div(sector, chunk_sects)); - if (raid0_make_request(mddev, &bp->bio1)) - generic_make_request(&bp->bio1); - if (raid0_make_request(mddev, &bp->bio2)) - generic_make_request(&bp->bio2); - - bio_pair_release(bp); - return 0; - } + do { + sector_t sector = bio->bi_iter.bi_sector; + unsigned chunk_sects = mddev->chunk_sectors; - sector_offset = bio->bi_sector; - zone = find_zone(mddev->private, §or_offset); - tmp_dev = map_sector(mddev, zone, bio->bi_sector, - §or_offset); - bio->bi_bdev = tmp_dev->bdev; - bio->bi_sector = sector_offset + zone->dev_start + - tmp_dev->data_offset; - /* - * Let the main block layer submit the IO and resolve recursion: - */ - return 1; + unsigned sectors = chunk_sects - + (likely(is_power_of_2(chunk_sects)) + ? (sector & (chunk_sects-1)) + : sector_div(sector, chunk_sects)); -bad_map: - printk("md/raid0:%s: make_request bug: can't convert block across chunks" - " or bigger than %dk %llu %d\n", - mdname(mddev), chunk_sects / 2, - (unsigned long long)bio->bi_sector, bio->bi_size >> 10); + if (sectors < bio_sectors(bio)) { + split = bio_split(bio, sectors, GFP_NOIO, fs_bio_set); + bio_chain(split, bio); + } else { + split = bio; + } - bio_io_error(bio); - return 0; + zone = find_zone(mddev->private, §or); + tmp_dev = map_sector(mddev, zone, sector, §or); + split->bi_bdev = tmp_dev->bdev; + split->bi_iter.bi_sector = sector + zone->dev_start + + tmp_dev->data_offset; + + if (unlikely((split->bi_rw & REQ_DISCARD) && + !blk_queue_discard(bdev_get_queue(split->bi_bdev)))) { + /* Just ignore it */ + bio_endio(split, 0); + } else + generic_make_request(split); + } while (split != bio); } -static void raid0_status(struct seq_file *seq, mddev_t *mddev) +static void raid0_status(struct seq_file *seq, struct mddev *mddev) { -#undef MD_DEBUG -#ifdef MD_DEBUG - int j, k, h; - char b[BDEVNAME_SIZE]; - raid0_conf_t *conf = mddev->private; - int raid_disks = conf->strip_zone[0].nb_dev; - - sector_t zone_size; - sector_t zone_start = 0; - h = 0; - - for (j = 0; j < conf->nr_strip_zones; j++) { - seq_printf(seq, " z%d", j); - seq_printf(seq, "=["); - for (k = 0; k < conf->strip_zone[j].nb_dev; k++) - seq_printf(seq, "%s/", bdevname( - conf->devlist[j*raid_disks + k] - ->bdev, b)); - - zone_size = conf->strip_zone[j].zone_end - zone_start; - seq_printf(seq, "] ze=%lld ds=%lld s=%lld\n", - (unsigned long long)zone_start>>1, - (unsigned long long)conf->strip_zone[j].dev_start>>1, - (unsigned long long)zone_size>>1); - zone_start = conf->strip_zone[j].zone_end; - } -#endif seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); return; } -static void *raid0_takeover_raid45(mddev_t *mddev) +static void *raid0_takeover_raid45(struct mddev *mddev) { - mdk_rdev_t *rdev; - raid0_conf_t *priv_conf; + struct md_rdev *rdev; + struct r0conf *priv_conf; if (mddev->degraded != 1) { printk(KERN_ERR "md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n", @@ -581,13 +571,14 @@ static void *raid0_takeover_raid45(mddev_t *mddev) return ERR_PTR(-EINVAL); } - list_for_each_entry(rdev, &mddev->disks, same_set) { + rdev_for_each(rdev, mddev) { /* check slot number for a disk */ if (rdev->raid_disk == mddev->raid_disks-1) { printk(KERN_ERR "md/raid0:%s: raid5 must have missing parity disk!\n", mdname(mddev)); return ERR_PTR(-EINVAL); } + rdev->sectors = mddev->dev_sectors; } /* Set new parameters */ @@ -603,9 +594,9 @@ static void *raid0_takeover_raid45(mddev_t *mddev) return priv_conf; } -static void *raid0_takeover_raid10(mddev_t *mddev) +static void *raid0_takeover_raid10(struct mddev *mddev) { - raid0_conf_t *priv_conf; + struct r0conf *priv_conf; /* Check layout: * - far_copies must be 1 @@ -644,12 +635,55 @@ static void *raid0_takeover_raid10(mddev_t *mddev) return priv_conf; } -static void *raid0_takeover(mddev_t *mddev) +static void *raid0_takeover_raid1(struct mddev *mddev) +{ + struct r0conf *priv_conf; + int chunksect; + + /* Check layout: + * - (N - 1) mirror drives must be already faulty + */ + if ((mddev->raid_disks - 1) != mddev->degraded) { + printk(KERN_ERR "md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n", + mdname(mddev)); + return ERR_PTR(-EINVAL); + } + + /* + * a raid1 doesn't have the notion of chunk size, so + * figure out the largest suitable size we can use. + */ + chunksect = 64 * 2; /* 64K by default */ + + /* The array must be an exact multiple of chunksize */ + while (chunksect && (mddev->array_sectors & (chunksect - 1))) + chunksect >>= 1; + + if ((chunksect << 9) < PAGE_SIZE) + /* array size does not allow a suitable chunk size */ + return ERR_PTR(-EINVAL); + + /* Set new parameters */ + mddev->new_level = 0; + mddev->new_layout = 0; + mddev->new_chunk_sectors = chunksect; + mddev->chunk_sectors = chunksect; + mddev->delta_disks = 1 - mddev->raid_disks; + mddev->raid_disks = 1; + /* make sure it will be not marked as dirty */ + mddev->recovery_cp = MaxSector; + + create_strip_zones(mddev, &priv_conf); + return priv_conf; +} + +static void *raid0_takeover(struct mddev *mddev) { /* raid0 can take over: * raid4 - if all data disks are active. * raid5 - providing it is Raid4 layout and one disk is faulty * raid10 - assuming we have all necessary active disks + * raid1 - with (N -1) mirror drives faulty */ if (mddev->level == 4) return raid0_takeover_raid45(mddev); @@ -665,14 +699,20 @@ static void *raid0_takeover(mddev_t *mddev) if (mddev->level == 10) return raid0_takeover_raid10(mddev); + if (mddev->level == 1) + return raid0_takeover_raid1(mddev); + + printk(KERN_ERR "Takeover from raid%i to raid0 not supported\n", + mddev->level); + return ERR_PTR(-EINVAL); } -static void raid0_quiesce(mddev_t *mddev, int state) +static void raid0_quiesce(struct mddev *mddev, int state) { } -static struct mdk_personality raid0_personality= +static struct md_personality raid0_personality= { .name = "raid0", .level = 0, |