X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fmd%2Fraid0.c;h=c08d7559be5531fb01bedb55e4663a0e40092607;hb=3b3809ac5375f614bbf8671cddeae3c693aa584e;hp=d8438494e9dbede455d3b8402e056511d796813d;hpb=a471200595b24fb1907ad12107a6a66db02c63f2;p=safe%2Fjmp%2Flinux-2.6 diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index d843849..c08d755 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -18,7 +18,10 @@ Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ -#include +#include +#include +#include "md.h" +#include "raid0.h" static void raid0_unplug(struct request_queue *q) { @@ -53,11 +56,10 @@ static int raid0_congested(void *data, int bits) static int create_strip_zones (mddev_t *mddev) { int i, c, j; - sector_t current_offset, curr_zone_offset; + sector_t current_start, curr_zone_start; sector_t min_spacing; raid0_conf_t *conf = mddev_to_conf(mddev); mdk_rdev_t *smallest, *rdev1, *rdev2, *rdev; - struct list_head *tmp1, *tmp2; struct strip_zone *zone; int cnt; char b[BDEVNAME_SIZE]; @@ -67,40 +69,40 @@ static int create_strip_zones (mddev_t *mddev) */ conf->nr_strip_zones = 0; - rdev_for_each(rdev1, tmp1, mddev) { - printk("raid0: looking at %s\n", + list_for_each_entry(rdev1, &mddev->disks, same_set) { + printk(KERN_INFO "raid0: looking at %s\n", bdevname(rdev1->bdev,b)); c = 0; - rdev_for_each(rdev2, tmp2, mddev) { - printk("raid0: comparing %s(%llu)", + list_for_each_entry(rdev2, &mddev->disks, same_set) { + printk(KERN_INFO "raid0: comparing %s(%llu)", bdevname(rdev1->bdev,b), - (unsigned long long)rdev1->size); - printk(" with %s(%llu)\n", + (unsigned long long)rdev1->sectors); + printk(KERN_INFO " with %s(%llu)\n", bdevname(rdev2->bdev,b), - (unsigned long long)rdev2->size); + (unsigned long long)rdev2->sectors); if (rdev2 == rdev1) { - printk("raid0: END\n"); + printk(KERN_INFO "raid0: END\n"); break; } - if (rdev2->size == rdev1->size) - { + if (rdev2->sectors == rdev1->sectors) { /* * Not unique, don't count it as a new * group */ - printk("raid0: EQUAL\n"); + printk(KERN_INFO "raid0: EQUAL\n"); c = 1; break; } - printk("raid0: NOT EQUAL\n"); + printk(KERN_INFO "raid0: NOT EQUAL\n"); } if (!c) { - printk("raid0: ==> UNIQUE\n"); + printk(KERN_INFO "raid0: ==> UNIQUE\n"); conf->nr_strip_zones++; - printk("raid0: %d zones\n", conf->nr_strip_zones); + printk(KERN_INFO "raid0: %d zones\n", + conf->nr_strip_zones); } } - printk("raid0: FINAL %d zones\n", conf->nr_strip_zones); + printk(KERN_INFO "raid0: FINAL %d zones\n", conf->nr_strip_zones); conf->strip_zone = kzalloc(sizeof(struct strip_zone)* conf->nr_strip_zones, GFP_KERNEL); @@ -119,16 +121,17 @@ static int create_strip_zones (mddev_t *mddev) cnt = 0; smallest = NULL; zone->dev = conf->devlist; - rdev_for_each(rdev1, tmp1, mddev) { + list_for_each_entry(rdev1, &mddev->disks, same_set) { int j = rdev1->raid_disk; if (j < 0 || j >= mddev->raid_disks) { - printk("raid0: bad disk number %d - aborting!\n", j); + printk(KERN_ERR "raid0: bad disk number %d - " + "aborting!\n", j); goto abort; } if (zone->dev[j]) { - printk("raid0: multiple devices for %d - aborting!\n", - j); + printk(KERN_ERR "raid0: multiple devices for %d - " + "aborting!\n", j); goto abort; } zone->dev[j] = rdev1; @@ -144,21 +147,21 @@ static int create_strip_zones (mddev_t *mddev) mddev->queue->max_sectors > (PAGE_SIZE>>9)) blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); - if (!smallest || (rdev1->size size)) + if (!smallest || (rdev1->sectors < smallest->sectors)) smallest = rdev1; cnt++; } if (cnt != mddev->raid_disks) { - printk("raid0: too few disks (%d of %d) - aborting!\n", - cnt, mddev->raid_disks); + printk(KERN_ERR "raid0: too few disks (%d of %d) - " + "aborting!\n", cnt, mddev->raid_disks); goto abort; } zone->nb_dev = cnt; - zone->size = smallest->size * cnt; - zone->zone_offset = 0; + zone->sectors = smallest->sectors * cnt; + zone->zone_start = 0; - current_offset = smallest->size; - curr_zone_offset = zone->size; + current_start = smallest->sectors; + curr_zone_start = zone->sectors; /* now do the other zones */ for (i = 1; i < conf->nr_strip_zones; i++) @@ -166,40 +169,41 @@ static int create_strip_zones (mddev_t *mddev) zone = conf->strip_zone + i; zone->dev = conf->strip_zone[i-1].dev + mddev->raid_disks; - printk("raid0: zone %d\n", i); - zone->dev_offset = current_offset; + printk(KERN_INFO "raid0: zone %d\n", i); + zone->dev_start = current_start; smallest = NULL; c = 0; for (j=0; jstrip_zone[0].dev[j]; - printk("raid0: checking %s ...", bdevname(rdev->bdev,b)); - if (rdev->size > current_offset) - { - printk(" contained as device %d\n", c); - zone->dev[c] = rdev; - c++; - if (!smallest || (rdev->size size)) { - smallest = rdev; - printk(" (%llu) is smallest!.\n", - (unsigned long long)rdev->size); - } - } else - printk(" nope.\n"); + printk(KERN_INFO "raid0: checking %s ...", + bdevname(rdev->bdev, b)); + if (rdev->sectors <= current_start) { + printk(KERN_INFO " nope.\n"); + continue; + } + printk(KERN_INFO " contained as device %d\n", c); + zone->dev[c] = rdev; + c++; + if (!smallest || rdev->sectors < smallest->sectors) { + smallest = rdev; + printk(KERN_INFO " (%llu) is smallest!.\n", + (unsigned long long)rdev->sectors); + } } zone->nb_dev = c; - zone->size = (smallest->size - current_offset) * c; - printk("raid0: zone->nb_dev: %d, size: %llu\n", - zone->nb_dev, (unsigned long long)zone->size); + zone->sectors = (smallest->sectors - current_start) * c; + printk(KERN_INFO "raid0: zone->nb_dev: %d, sectors: %llu\n", + zone->nb_dev, (unsigned long long)zone->sectors); - zone->zone_offset = curr_zone_offset; - curr_zone_offset += zone->size; + zone->zone_start = curr_zone_start; + curr_zone_start += zone->sectors; - current_offset = smallest->size; - printk("raid0: current zone offset: %llu\n", - (unsigned long long)current_offset); + current_start = smallest->sectors; + printk(KERN_INFO "raid0: current zone start: %llu\n", + (unsigned long long)current_start); } /* Now find appropriate hash spacing. @@ -210,16 +214,16 @@ static int create_strip_zones (mddev_t *mddev) * strip though as it's size has no bearing on the efficacy of the hash * table. */ - conf->hash_spacing = curr_zone_offset; - min_spacing = curr_zone_offset; + conf->spacing = curr_zone_start; + min_spacing = curr_zone_start; sector_div(min_spacing, PAGE_SIZE/sizeof(struct strip_zone*)); for (i=0; i < conf->nr_strip_zones-1; i++) { - sector_t sz = 0; - for (j=i; jnr_strip_zones-1 && - sz < min_spacing ; j++) - sz += conf->strip_zone[j].size; - if (sz >= min_spacing && sz < conf->hash_spacing) - conf->hash_spacing = sz; + sector_t s = 0; + for (j = i; j < conf->nr_strip_zones - 1 && + s < min_spacing; j++) + s += conf->strip_zone[j].sectors; + if (s >= min_spacing && s < conf->spacing) + conf->spacing = s; } mddev->queue->unplug_fn = raid0_unplug; @@ -227,7 +231,7 @@ static int create_strip_zones (mddev_t *mddev) mddev->queue->backing_dev_info.congested_fn = raid0_congested; mddev->queue->backing_dev_info.congested_data = mddev; - printk("raid0: done.\n"); + printk(KERN_INFO "raid0: done.\n"); return 0; abort: return 1; @@ -259,13 +263,25 @@ static int raid0_mergeable_bvec(struct request_queue *q, return max; } +static sector_t raid0_size(mddev_t *mddev, sector_t sectors, int raid_disks) +{ + sector_t array_sectors = 0; + mdk_rdev_t *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; + + return array_sectors; +} + static int raid0_run (mddev_t *mddev) { unsigned cur=0, i=0, nb_zone; - s64 size; + s64 sectors; raid0_conf_t *conf; - mdk_rdev_t *rdev; - struct list_head *tmp; if (mddev->chunk_size == 0) { printk(KERN_ERR "md/raid0: non-zero chunk size required.\n"); @@ -290,55 +306,53 @@ static int raid0_run (mddev_t *mddev) goto out_free_conf; /* calculate array device size */ - mddev->array_sectors = 0; - rdev_for_each(rdev, tmp, mddev) - mddev->array_sectors += rdev->size * 2; - - printk("raid0 : md_size is %llu blocks.\n", - (unsigned long long)mddev->array_sectors / 2); - printk("raid0 : conf->hash_spacing is %llu blocks.\n", - (unsigned long long)conf->hash_spacing); + md_set_array_sectors(mddev, raid0_size(mddev, 0, 0)); + + printk(KERN_INFO "raid0 : md_size is %llu sectors.\n", + (unsigned long long)mddev->array_sectors); + printk(KERN_INFO "raid0 : conf->spacing is %llu sectors.\n", + (unsigned long long)conf->spacing); { - sector_t s = mddev->array_sectors / 2; - sector_t space = conf->hash_spacing; + sector_t s = raid0_size(mddev, 0, 0); + sector_t space = conf->spacing; int round; - conf->preshift = 0; + conf->sector_shift = 0; if (sizeof(sector_t) > sizeof(u32)) { /*shift down space and s so that sector_div will work */ while (space > (sector_t) (~(u32)0)) { s >>= 1; space >>= 1; s += 1; /* force round-up */ - conf->preshift++; + conf->sector_shift++; } } round = sector_div(s, (u32)space) ? 1 : 0; nb_zone = s + round; } - printk("raid0 : nb_zone is %d.\n", nb_zone); + printk(KERN_INFO "raid0 : nb_zone is %d.\n", nb_zone); - printk("raid0 : Allocating %Zd bytes for hash.\n", + printk(KERN_INFO "raid0 : Allocating %zu bytes for hash.\n", nb_zone*sizeof(struct strip_zone*)); conf->hash_table = kmalloc (sizeof (struct strip_zone *)*nb_zone, GFP_KERNEL); if (!conf->hash_table) goto out_free_conf; - size = conf->strip_zone[cur].size; + sectors = conf->strip_zone[cur].sectors; conf->hash_table[0] = conf->strip_zone + cur; for (i=1; i< nb_zone; i++) { - while (size <= conf->hash_spacing) { + while (sectors <= conf->spacing) { cur++; - size += conf->strip_zone[cur].size; + sectors += conf->strip_zone[cur].sectors; } - size -= conf->hash_spacing; + sectors -= conf->spacing; conf->hash_table[i] = conf->strip_zone + cur; } - if (conf->preshift) { - conf->hash_spacing >>= conf->preshift; - /* round hash_spacing up so when we divide by it, we + if (conf->sector_shift) { + conf->spacing >>= conf->sector_shift; + /* round spacing up so when we divide by it, we * err on the side of too-low, which is safest */ - conf->hash_spacing++; + conf->spacing++; } /* calculate the max read-ahead size. @@ -392,7 +406,7 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio) struct strip_zone *zone; mdk_rdev_t *tmp_dev; sector_t chunk; - sector_t block, rsect; + sector_t sector, rsect; const int rw = bio_data_dir(bio); int cpu; @@ -409,8 +423,7 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio) chunk_sects = mddev->chunk_size >> 9; chunksect_bits = ffz(~chunk_sects); - block = bio->bi_sector >> 1; - + sector = bio->bi_sector; if (unlikely(chunk_sects < (bio->bi_sector & (chunk_sects - 1)) + (bio->bi_size >> 9))) { struct bio_pair *bp; @@ -433,28 +446,27 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio) { - sector_t x = block >> conf->preshift; - sector_div(x, (u32)conf->hash_spacing); + sector_t x = sector >> conf->sector_shift; + sector_div(x, (u32)conf->spacing); zone = conf->hash_table[x]; } - - while (block >= (zone->zone_offset + zone->size)) + + while (sector >= zone->zone_start + zone->sectors) zone++; - + sect_in_chunk = bio->bi_sector & (chunk_sects - 1); { - sector_t x = (block - zone->zone_offset) >> (chunksect_bits - 1); + sector_t x = (sector - zone->zone_start) >> chunksect_bits; sector_div(x, zone->nb_dev); chunk = x; - x = block >> (chunksect_bits - 1); + x = sector >> chunksect_bits; tmp_dev = zone->dev[sector_div(x, zone->nb_dev)]; } - rsect = (((chunk << (chunksect_bits - 1)) + zone->dev_offset)<<1) - + sect_in_chunk; + rsect = (chunk << chunksect_bits) + zone->dev_start + sect_in_chunk; bio->bi_bdev = tmp_dev->bdev; bio->bi_sector = rsect + tmp_dev->data_offset; @@ -491,10 +503,10 @@ static void raid0_status (struct seq_file *seq, mddev_t *mddev) seq_printf(seq, "%s/", bdevname( conf->strip_zone[j].dev[k]->bdev,b)); - seq_printf(seq, "] zo=%d do=%d s=%d\n", - conf->strip_zone[j].zone_offset, - conf->strip_zone[j].dev_offset, - conf->strip_zone[j].size); + seq_printf(seq, "] zs=%d ds=%d s=%d\n", + conf->strip_zone[j].zone_start, + conf->strip_zone[j].dev_start, + conf->strip_zone[j].sectors); } #endif seq_printf(seq, " %dk chunks", mddev->chunk_size/1024); @@ -510,6 +522,7 @@ static struct mdk_personality raid0_personality= .run = raid0_run, .stop = raid0_stop, .status = raid0_status, + .size = raid0_size, }; static int __init raid0_init (void)