X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fmd%2Fraid0.c;h=77605cdceaf179ce1a5ce15d9bf50d4239efb91e;hb=f653398c86a1c104f0992bd788dd4bb065449be4;hp=e7d934eca06f8de135d9cd5b545735422bc57790;hpb=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2;p=safe%2Fjmp%2Flinux-2.6

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index e7d934e..77605cd 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -18,115 +18,137 @@
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
 */
 
-#include <linux/module.h>
-#include <linux/raid/raid0.h>
+#include <linux/blkdev.h>
+#include <linux/seq_file.h>
+#include "md.h"
+#include "raid0.h"
 
-#define MAJOR_NR MD_MAJOR
-#define MD_DRIVER
-#define MD_PERSONALITY
-
-static void raid0_unplug(request_queue_t *q)
+static void raid0_unplug(struct request_queue *q)
 {
 	mddev_t *mddev = q->queuedata;
-	raid0_conf_t *conf = mddev_to_conf(mddev);
-	mdk_rdev_t **devlist = conf->strip_zone[0].dev;
+	raid0_conf_t *conf = mddev->private;
+	mdk_rdev_t **devlist = conf->devlist;
 	int i;
 
 	for (i=0; i<mddev->raid_disks; i++) {
-		request_queue_t *r_queue = bdev_get_queue(devlist[i]->bdev);
+		struct request_queue *r_queue = bdev_get_queue(devlist[i]->bdev);
 
-		if (r_queue->unplug_fn)
-			r_queue->unplug_fn(r_queue);
+		blk_unplug(r_queue);
 	}
 }
 
-static int raid0_issue_flush(request_queue_t *q, struct gendisk *disk,
-			     sector_t *error_sector)
+static int raid0_congested(void *data, int bits)
 {
-	mddev_t *mddev = q->queuedata;
-	raid0_conf_t *conf = mddev_to_conf(mddev);
-	mdk_rdev_t **devlist = conf->strip_zone[0].dev;
+	mddev_t *mddev = data;
+	raid0_conf_t *conf = mddev->private;
+	mdk_rdev_t **devlist = conf->devlist;
 	int i, ret = 0;
 
-	for (i=0; i<mddev->raid_disks && ret == 0; i++) {
-		struct block_device *bdev = devlist[i]->bdev;
-		request_queue_t *r_queue = bdev_get_queue(bdev);
+	if (mddev_congested(mddev, bits))
+		return 1;
 
-		if (!r_queue->issue_flush_fn)
-			ret = -EOPNOTSUPP;
-		else
-			ret = r_queue->issue_flush_fn(r_queue, bdev->bd_disk, error_sector);
+	for (i = 0; i < mddev->raid_disks && !ret ; i++) {
+		struct request_queue *q = bdev_get_queue(devlist[i]->bdev);
+
+		ret |= bdi_congested(&q->backing_dev_info, bits);
 	}
 	return ret;
 }
 
+/*
+ * inform the user of the raid configuration
+*/
+static void dump_zones(mddev_t *mddev)
+{
+	int j, k, h;
+	sector_t zone_size = 0;
+	sector_t zone_start = 0;
+	char b[BDEVNAME_SIZE];
+	raid0_conf_t *conf = mddev->private;
+	printk(KERN_INFO "******* %s configuration *********\n",
+		mdname(mddev));
+	h = 0;
+	for (j = 0; j < conf->nr_strip_zones; j++) {
+		printk(KERN_INFO "zone%d=[", j);
+		for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
+			printk("%s/",
+			bdevname(conf->devlist[j*mddev->raid_disks
+						+ k]->bdev, b));
+		printk("]\n");
+
+		zone_size  = conf->strip_zone[j].zone_end - zone_start;
+		printk(KERN_INFO "        zone offset=%llukb "
+				"device offset=%llukb size=%llukb\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");
+}
 
-static int create_strip_zones (mddev_t *mddev)
+static int create_strip_zones(mddev_t *mddev)
 {
-	int i, c, j;
-	sector_t current_offset, curr_zone_offset;
-	sector_t min_spacing;
-	raid0_conf_t *conf = mddev_to_conf(mddev);
-	mdk_rdev_t *smallest, *rdev1, *rdev2, *rdev;
-	struct list_head *tmp1, *tmp2;
+	int i, c, err;
+	sector_t curr_zone_end, sectors;
+	mdk_rdev_t *smallest, *rdev1, *rdev2, *rdev, **dev;
 	struct strip_zone *zone;
 	int cnt;
 	char b[BDEVNAME_SIZE];
- 
-	/*
-	 * The number of 'same size groups'
-	 */
-	conf->nr_strip_zones = 0;
- 
-	ITERATE_RDEV(mddev,rdev1,tmp1) {
-		printk("raid0: looking at %s\n",
+	raid0_conf_t *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
+
+	if (!conf)
+		return -ENOMEM;
+	list_for_each_entry(rdev1, &mddev->disks, same_set) {
+		printk(KERN_INFO "raid0: looking at %s\n",
 			bdevname(rdev1->bdev,b));
 		c = 0;
-		ITERATE_RDEV(mddev,rdev2,tmp2) {
-			printk("raid0:   comparing %s(%llu)",
+
+		/* round size to chunk_size */
+		sectors = rdev1->sectors;
+		sector_div(sectors, mddev->chunk_sectors);
+		rdev1->sectors = sectors * mddev->chunk_sectors;
+
+		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);
-
-	conf->strip_zone = kmalloc(sizeof(struct strip_zone)*
+	printk(KERN_INFO "raid0: FINAL %d zones\n", conf->nr_strip_zones);
+	err = -ENOMEM;
+	conf->strip_zone = kzalloc(sizeof(struct strip_zone)*
 				conf->nr_strip_zones, GFP_KERNEL);
 	if (!conf->strip_zone)
-		return 1;
-	conf->devlist = kmalloc(sizeof(mdk_rdev_t*)*
+		goto abort;
+	conf->devlist = kzalloc(sizeof(mdk_rdev_t*)*
 				conf->nr_strip_zones*mddev->raid_disks,
 				GFP_KERNEL);
 	if (!conf->devlist)
-		return 1;
-
-	memset(conf->strip_zone, 0,sizeof(struct strip_zone)*
-				   conf->nr_strip_zones);
-	memset(conf->devlist, 0,
-	       sizeof(mdk_rdev_t*) * conf->nr_strip_zones * mddev->raid_disks);
+		goto abort;
 
 	/* The first zone must contain all devices, so here we check that
 	 * there is a proper alignment of slots to devices and find them all
@@ -134,137 +156,144 @@ static int create_strip_zones (mddev_t *mddev)
 	zone = &conf->strip_zone[0];
 	cnt = 0;
 	smallest = NULL;
-	zone->dev = conf->devlist;
-	ITERATE_RDEV(mddev, rdev1, tmp1) {
+	dev = conf->devlist;
+	err = -EINVAL;
+	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);
+		if (dev[j]) {
+			printk(KERN_ERR "raid0: multiple devices for %d - "
+				"aborting!\n", j);
 			goto abort;
 		}
-		zone->dev[j] = rdev1;
+		dev[j] = rdev1;
 
-		blk_queue_stack_limits(mddev->queue,
-				       rdev1->bdev->bd_disk->queue);
+		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_sector to one PAGE, as
 		 * a one page request is never in violation.
 		 */
 
 		if (rdev1->bdev->bd_disk->queue->merge_bvec_fn &&
-		    mddev->queue->max_sectors > (PAGE_SIZE>>9))
+		    queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
 			blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
 
-		if (!smallest || (rdev1->size <smallest->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->zone_end = smallest->sectors * cnt;
 
-	current_offset = smallest->size;
-	curr_zone_offset = zone->size;
+	curr_zone_end = zone->zone_end;
 
 	/* now do the other zones */
 	for (i = 1; i < conf->nr_strip_zones; i++)
 	{
+		int j;
+
 		zone = conf->strip_zone + i;
-		zone->dev = conf->strip_zone[i-1].dev + mddev->raid_disks;
+		dev = conf->devlist + i * 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 = smallest->sectors;
 		smallest = NULL;
 		c = 0;
 
 		for (j=0; j<cnt; j++) {
-			char b[BDEVNAME_SIZE];
-			rdev = conf->strip_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 <smallest->size)) {
-					smallest = rdev;
-					printk("  (%llu) is smallest!.\n", 
-						(unsigned long long)rdev->size);
-				}
-			} else
-				printk(" nope.\n");
+			rdev = conf->devlist[j];
+			printk(KERN_INFO "raid0: checking %s ...",
+				bdevname(rdev->bdev, b));
+			if (rdev->sectors <= zone->dev_start) {
+				printk(KERN_INFO " nope.\n");
+				continue;
+			}
+			printk(KERN_INFO " contained as device %d\n", c);
+			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);
+		sectors = (smallest->sectors - zone->dev_start) * c;
+		printk(KERN_INFO "raid0: zone->nb_dev: %d, sectors: %llu\n",
+			zone->nb_dev, (unsigned long long)sectors);
 
-		zone->zone_offset = curr_zone_offset;
-		curr_zone_offset += zone->size;
+		curr_zone_end += sectors;
+		zone->zone_end = curr_zone_end;
 
-		current_offset = smallest->size;
-		printk("raid0: current zone offset: %llu\n",
-			(unsigned long long)current_offset);
+		printk(KERN_INFO "raid0: current zone start: %llu\n",
+			(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;
 
-	/* Now find appropriate hash spacing.
-	 * We want a number which causes most hash entries to cover
-	 * at most two strips, but the hash table must be at most
-	 * 1 PAGE.  We choose the smallest strip, or contiguous collection
-	 * of strips, that has big enough size.  We never consider the last
-	 * strip though as it's size has no bearing on the efficacy of the hash
-	 * table.
+	/*
+	 * now since we have the hard sector sizes, we can make sure
+	 * chunk size is a multiple of that sector size
 	 */
-	conf->hash_spacing = curr_zone_offset;
-	min_spacing = curr_zone_offset;
-	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; j<conf->nr_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;
+	if ((mddev->chunk_sectors << 9) % queue_logical_block_size(mddev->queue)) {
+		printk(KERN_ERR "%s chunk_size of %d not valid\n",
+		       mdname(mddev),
+		       mddev->chunk_sectors << 9);
+		goto abort;
 	}
 
-	mddev->queue->unplug_fn = raid0_unplug;
-
-	mddev->queue->issue_flush_fn = raid0_issue_flush;
+	blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
+	blk_queue_io_opt(mddev->queue,
+			 (mddev->chunk_sectors << 9) * mddev->raid_disks);
 
-	printk("raid0: done.\n");
+	printk(KERN_INFO "raid0: done.\n");
+	mddev->private = conf;
 	return 0;
- abort:
-	return 1;
+abort:
+	kfree(conf->strip_zone);
+	kfree(conf->devlist);
+	kfree(conf);
+	mddev->private = NULL;
+	return err;
 }
 
 /**
  *	raid0_mergeable_bvec -- tell bio layer if a two requests can be merged
  *	@q: request queue
- *	@bio: the buffer head that's been built up so far
+ *	@bvm: properties of new bio
  *	@biovec: the request that could be merged to it.
  *
  *	Return amount of bytes we can accept at this offset
  */
-static int raid0_mergeable_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *biovec)
+static int raid0_mergeable_bvec(struct request_queue *q,
+				struct bvec_merge_data *bvm,
+				struct bio_vec *biovec)
 {
 	mddev_t *mddev = q->queuedata;
-	sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev);
+	sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
 	int max;
-	unsigned int chunk_sectors = mddev->chunk_size >> 9;
-	unsigned int bio_sectors = bio->bi_size >> 9;
-
-	max =  (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9;
+	unsigned int chunk_sectors = mddev->chunk_sectors;
+	unsigned int bio_sectors = bvm->bi_size >> 9;
+
+	if (is_power_of_2(chunk_sectors))
+		max =  (chunk_sectors - ((sector & (chunk_sectors-1))
+						+ bio_sectors)) << 9;
+	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 <= biovec->bv_len && bio_sectors == 0)
 		return biovec->bv_len;
@@ -272,85 +301,42 @@ static int raid0_mergeable_bvec(request_queue_t *q, struct bio *bio, struct bio_
 		return max;
 }
 
-static int raid0_run (mddev_t *mddev)
+static sector_t raid0_size(mddev_t *mddev, sector_t sectors, int raid_disks)
 {
-	unsigned  cur=0, i=0, nb_zone;
-	s64 size;
-	raid0_conf_t *conf;
+	sector_t array_sectors = 0;
 	mdk_rdev_t *rdev;
-	struct list_head *tmp;
 
-	printk("%s: setting max_sectors to %d, segment boundary to %d\n",
-	       mdname(mddev),
-	       mddev->chunk_size >> 9,
-	       (mddev->chunk_size>>1)-1);
-	blk_queue_max_sectors(mddev->queue, mddev->chunk_size >> 9);
-	blk_queue_segment_boundary(mddev->queue, (mddev->chunk_size>>1) - 1);
+	WARN_ONCE(sectors || raid_disks,
+		  "%s does not support generic reshape\n", __func__);
 
-	conf = kmalloc(sizeof (raid0_conf_t), GFP_KERNEL);
-	if (!conf)
-		goto out;
-	mddev->private = (void *)conf;
- 
-	conf->strip_zone = NULL;
-	conf->devlist = NULL;
-	if (create_strip_zones (mddev)) 
-		goto out_free_conf;
+	list_for_each_entry(rdev, &mddev->disks, same_set)
+		array_sectors += rdev->sectors;
 
-	/* calculate array device size */
-	mddev->array_size = 0;
-	ITERATE_RDEV(mddev,rdev,tmp)
-		mddev->array_size += rdev->size;
-
-	printk("raid0 : md_size is %llu blocks.\n", 
-		(unsigned long long)mddev->array_size);
-	printk("raid0 : conf->hash_spacing is %llu blocks.\n",
-		(unsigned long long)conf->hash_spacing);
-	{
-#if __GNUC__ < 3
-		volatile
-#endif
-		sector_t s = mddev->array_size;
-		sector_t space = conf->hash_spacing;
-		int round;
-		conf->preshift = 0;
-		if (sizeof(sector_t) > sizeof(unsigned long)) {
-			/*shift down space and s so that sector_div will work */
-			while (space > (sector_t) (~(unsigned long)0)) {
-				s >>= 1;
-				space >>= 1;
-				s += 1; /* force round-up */
-				conf->preshift++;
-			}
-		}
-		round = sector_div(s, (unsigned long)space) ? 1 : 0;
-		nb_zone = s + round;
-	}
-	printk("raid0 : nb_zone is %d.\n", nb_zone);
-
-	printk("raid0 : Allocating %Zd 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;
-
-	for (i=0; i< nb_zone; i++) {
-		conf->hash_table[i] = conf->strip_zone + cur;
-		while (size <= conf->hash_spacing) {
-			cur++;
-			size += conf->strip_zone[cur].size;
-		}
-		size -= conf->hash_spacing;
-	}
-	if (conf->preshift) {
-		conf->hash_spacing >>= conf->preshift;
-		/* round hash_spacing up so when we divide by it, we
-		 * err on the side of too-low, which is safest
-		 */
-		conf->hash_spacing++;
+	return array_sectors;
+}
+
+static int raid0_run(mddev_t *mddev)
+{
+	int ret;
+
+	if (mddev->chunk_sectors == 0) {
+		printk(KERN_ERR "md/raid0: chunk size must be set.\n");
+		return -EINVAL;
 	}
+	if (md_check_no_bitmap(mddev))
+		return -EINVAL;
+	blk_queue_max_sectors(mddev->queue, mddev->chunk_sectors);
+	mddev->queue->queue_lock = &mddev->queue->__queue_lock;
+
+	ret = create_strip_zones(mddev);
+	if (ret < 0)
+		return ret;
+
+	/* calculate array device size */
+	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);
 	/* calculate the max read-ahead size.
 	 * For read-ahead of large files to be effective, we need to
 	 * readahead at least twice a whole stripe. i.e. number of devices
@@ -361,66 +347,125 @@ static int raid0_run (mddev_t *mddev)
 	 * chunksize should be used in that case.
 	 */
 	{
-		int stripe = mddev->raid_disks * mddev->chunk_size / PAGE_CACHE_SIZE;
+		int stripe = mddev->raid_disks *
+			(mddev->chunk_sectors << 9) / PAGE_SIZE;
 		if (mddev->queue->backing_dev_info.ra_pages < 2* stripe)
 			mddev->queue->backing_dev_info.ra_pages = 2* stripe;
 	}
 
-
 	blk_queue_merge_bvec(mddev->queue, raid0_mergeable_bvec);
+	dump_zones(mddev);
+	md_integrity_register(mddev);
 	return 0;
+}
 
-out_free_conf:
-	if (conf->strip_zone)
-		kfree(conf->strip_zone);
-	if (conf->devlist)
-		kfree (conf->devlist);
+static int raid0_stop(mddev_t *mddev)
+{
+	raid0_conf_t *conf = mddev->private;
+
+	blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
+	kfree(conf->strip_zone);
+	kfree(conf->devlist);
 	kfree(conf);
 	mddev->private = NULL;
-out:
-	return 1;
+	return 0;
 }
 
-static int raid0_stop (mddev_t *mddev)
+/* 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)
 {
-	raid0_conf_t *conf = mddev_to_conf(mddev);
+	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();
+}
 
-	blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
-	kfree (conf->hash_table);
-	conf->hash_table = NULL;
-	kfree (conf->strip_zone);
-	conf->strip_zone = NULL;
-	kfree (conf);
-	mddev->private = NULL;
+/*
+ * 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;
+	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)*mddev->raid_disks
+			     + sector_div(sector, zone->nb_dev)];
+}
 
-	return 0;
+/*
+ * Is io distribute over 1 or more chunks ?
+*/
+static inline int is_io_in_chunk_boundary(mddev_t *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));
+	} else{
+		sector_t sector = bio->bi_sector;
+		return chunk_sects >= (sector_div(sector, chunk_sects)
+						+ (bio->bi_size >> 9));
+	}
 }
 
-static int raid0_make_request (request_queue_t *q, struct bio *bio)
+static int raid0_make_request(struct request_queue *q, struct bio *bio)
 {
 	mddev_t *mddev = q->queuedata;
-	unsigned int sect_in_chunk, chunksize_bits,  chunk_size, chunk_sects;
-	raid0_conf_t *conf = mddev_to_conf(mddev);
+	unsigned int chunk_sects;
+	sector_t sector_offset;
 	struct strip_zone *zone;
 	mdk_rdev_t *tmp_dev;
-	unsigned long chunk;
-	sector_t block, rsect;
-
-	if (bio_data_dir(bio)==WRITE) {
-		disk_stat_inc(mddev->gendisk, writes);
-		disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bio));
-	} else {
-		disk_stat_inc(mddev->gendisk, reads);
-		disk_stat_add(mddev->gendisk, read_sectors, bio_sectors(bio));
+	const int rw = bio_data_dir(bio);
+	int cpu;
+
+	if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
+		md_barrier_request(mddev, bio);
+		return 0;
 	}
 
-	chunk_size = mddev->chunk_size >> 10;
-	chunk_sects = mddev->chunk_size >> 9;
-	chunksize_bits = ffz(~chunk_size);
-	block = bio->bi_sector >> 1;
-	
+	cpu = part_stat_lock();
+	part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
+	part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
+		      bio_sectors(bio));
+	part_stat_unlock();
 
-	if (unlikely(chunk_sects < (bio->bi_sector & (chunk_sects - 1)) + (bio->bi_size >> 9))) {
+	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 ||
@@ -429,7 +474,12 @@ static int raid0_make_request (request_queue_t *q, struct bio *bio)
 		/* This is a one page bio that upper layers
 		 * refuse to split for us, so we need to split it.
 		 */
-		bp = bio_split(bio, bio_split_pool, chunk_sects - (bio->bi_sector & (chunk_sects - 1)) );
+		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(q, &bp->bio1))
 			generic_make_request(&bp->bio1);
 		if (raid0_make_request(q, &bp->bio2))
@@ -438,39 +488,14 @@ static int raid0_make_request (request_queue_t *q, struct bio *bio)
 		bio_pair_release(bp);
 		return 0;
 	}
- 
-
-	{
-#if __GNUC__ < 3
-		volatile
-#endif
-		sector_t x = block >> conf->preshift;
-		sector_div(x, (unsigned long)conf->hash_spacing);
-		zone = conf->hash_table[x];
-	}
- 
-	while (block >= (zone->zone_offset + zone->size)) 
-		zone++;
-    
-	sect_in_chunk = bio->bi_sector & ((chunk_size<<1) -1);
-
-
-	{
-		sector_t x =  (block - zone->zone_offset) >> chunksize_bits;
-
-		sector_div(x, zone->nb_dev);
-		chunk = x;
-		BUG_ON(x != (sector_t)chunk);
 
-		x = block >> chunksize_bits;
-		tmp_dev = zone->dev[sector_div(x, zone->nb_dev)];
-	}
-	rsect = (((chunk << chunksize_bits) + zone->dev_offset)<<1)
-		+ sect_in_chunk;
- 
+	sector_offset = bio->bi_sector;
+	zone =  find_zone(mddev->private, &sector_offset);
+	tmp_dev = map_sector(mddev, zone, bio->bi_sector,
+			     &sector_offset);
 	bio->bi_bdev = tmp_dev->bdev;
-	bio->bi_sector = rsect + tmp_dev->data_offset;
-
+	bio->bi_sector = sector_offset + zone->dev_start +
+		tmp_dev->data_offset;
 	/*
 	 * Let the main block layer submit the IO and resolve recursion:
 	 */
@@ -478,62 +503,71 @@ static int raid0_make_request (request_queue_t *q, struct bio *bio)
 
 bad_map:
 	printk("raid0_make_request bug: can't convert block across chunks"
-		" or bigger than %dk %llu %d\n", chunk_size, 
+		" or bigger than %dk %llu %d\n", chunk_sects / 2,
 		(unsigned long long)bio->bi_sector, bio->bi_size >> 10);
 
-	bio_io_error(bio, bio->bi_size);
+	bio_io_error(bio);
 	return 0;
 }
-			   
-static void raid0_status (struct seq_file *seq, mddev_t *mddev)
+
+static void raid0_status(struct seq_file *seq, mddev_t *mddev)
 {
 #undef MD_DEBUG
 #ifdef MD_DEBUG
 	int j, k, h;
 	char b[BDEVNAME_SIZE];
-	raid0_conf_t *conf = mddev_to_conf(mddev);
-  
+	raid0_conf_t *conf = mddev->private;
+
+	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);
-		if (conf->hash_table[h] == conf->strip_zone+j)
-			seq_printf("(h%d)", h++);
 		seq_printf(seq, "=[");
 		for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
-			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, "%s/", bdevname(
+				conf->devlist[j*mddev->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_size/1024);
+	seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2);
 	return;
 }
 
-static mdk_personality_t raid0_personality=
+static struct mdk_personality raid0_personality=
 {
 	.name		= "raid0",
+	.level		= 0,
 	.owner		= THIS_MODULE,
 	.make_request	= raid0_make_request,
 	.run		= raid0_run,
 	.stop		= raid0_stop,
 	.status		= raid0_status,
+	.size		= raid0_size,
 };
 
 static int __init raid0_init (void)
 {
-	return register_md_personality (RAID0, &raid0_personality);
+	return register_md_personality (&raid0_personality);
 }
 
 static void raid0_exit (void)
 {
-	unregister_md_personality (RAID0);
+	unregister_md_personality (&raid0_personality);
 }
 
 module_init(raid0_init);
 module_exit(raid0_exit);
 MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("RAID0 (striping) personality for MD");
 MODULE_ALIAS("md-personality-2"); /* RAID0 */
+MODULE_ALIAS("md-raid0");
+MODULE_ALIAS("md-level-0");