Release 4.11 drivers/md/raid0.c

/*
   raid0.c : Multiple Devices driver for Linux
             Copyright (C) 1994-96 Marc ZYNGIER
             <zyngier@ufr-info-p7.ibp.fr> or
             <maz@gloups.fdn.fr>
             Copyright (C) 1999, 2000 Ingo Molnar, Red Hat

   RAID-0 management functions.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   You should have received a copy of the GNU General Public License
   (for example /usr/src/linux/COPYING); if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/blkdev.h>
#include <linux/seq_file.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <trace/events/block.h>
#include "md.h"
#include "raid0.h"
#include "raid5.h"


#define UNSUPPORTED_MDDEV_FLAGS		\
	((1L << MD_HAS_JOURNAL) |       \
         (1L << MD_JOURNAL_CLEAN) |     \
         (1L << MD_FAILFAST_SUPPORTED))



static int raid0_congested(struct mddev *mddev, int bits)
{
	struct r0conf *conf = mddev->private;
	struct md_rdev **devlist = conf->devlist;
	int raid_disks = conf->strip_zone[0].nb_dev;
	int i, ret = 0;

	for (i = 0; i < raid_disks && !ret ; i++) {
		struct request_queue *q = bdev_get_queue(devlist[i]->bdev);

		ret |= bdi_congested(q->backing_dev_info, bits);
	}
	return ret;
}

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9
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/*
 * inform the user of the raid configuration
*/


static void dump_zones(struct mddev *mddev)
{
	int j, k;
	sector_t zone_size = 0;
	sector_t zone_start = 0;
	char b[BDEVNAME_SIZE];
	struct r0conf *conf = mddev->private;
	int raid_disks = conf->strip_zone[0].nb_dev;
	pr_debug("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++) {
		char line[200];
		int len = 0;

		for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
			len += snprintf(line+len, 200-len, "%s%s", k?"/":"",
					bdevname(conf->devlist[j*raid_disks
							       + k]->bdev, b));
		pr_debug("md: zone%d=[%s]\n", j, line);

		zone_size  = conf->strip_zone[j].zone_end - zone_start;
		pr_debug("      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;
	}
}

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6
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static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf)
{
	int i, c, err;
	sector_t curr_zone_end, sectors;
	struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev;
	struct strip_zone *zone;
	int cnt;
	char b[BDEVNAME_SIZE];
	char b2[BDEVNAME_SIZE];
	struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
	unsigned short blksize = 512;

	*private_conf = ERR_PTR(-ENOMEM);
	if (!conf)
		return -ENOMEM;
	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 */
		sectors = rdev1->sectors;
		sector_div(sectors, mddev->chunk_sectors);
		rdev1->sectors = sectors * mddev->chunk_sectors;

		blksize = max(blksize, queue_logical_block_size(
				      rdev1->bdev->bd_disk->queue));

		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) {
				pr_debug("md/raid0:%s:   END\n",
					 mdname(mddev));
				break;
			}
			if (rdev2->sectors == rdev1->sectors) {
				/*
                                 * Not unique, don't count it as a new
                                 * group
                                 */
				pr_debug("md/raid0:%s:   EQUAL\n",
					 mdname(mddev));
				c = 1;
				break;
			}
			pr_debug("md/raid0:%s:   NOT EQUAL\n",
				 mdname(mddev));
		}
		if (!c) {
			pr_debug("md/raid0:%s:   ==> UNIQUE\n",
				 mdname(mddev));
			conf->nr_strip_zones++;
			pr_debug("md/raid0:%s: %d zones\n",
				 mdname(mddev), conf->nr_strip_zones);
		}
	}
	pr_debug("md/raid0:%s: FINAL %d zones\n",
		 mdname(mddev), conf->nr_strip_zones);
	/*
         * now since we have the hard sector sizes, we can make sure
         * chunk size is a multiple of that sector size
         */
	if ((mddev->chunk_sectors << 9) % blksize) {
		pr_warn("md/raid0:%s: chunk_size of %d not multiple of block size %d\n",
			mdname(mddev),
			mddev->chunk_sectors << 9, blksize);
		err = -EINVAL;
		goto abort;
	}

	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(struct md_rdev*)*
				conf->nr_strip_zones*mddev->raid_disks,
				GFP_KERNEL);
	if (!conf->devlist)
		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
         */
	zone = &conf->strip_zone[0];
	cnt = 0;
	smallest = NULL;
	dev = conf->devlist;
	err = -EINVAL;
	rdev_for_each(rdev1, mddev) {
		int j = rdev1->raid_disk;

		if (mddev->level == 10) {
			/* taking over a raid10-n2 array */
			j /= 2;
			rdev1->new_raid_disk = j;
		}

		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) {
			pr_warn("md/raid0:%s: remove inactive devices before converting to RAID0\n",
				mdname(mddev));
			goto abort;
		}
		if (j >= mddev->raid_disks) {
			pr_warn("md/raid0:%s: bad disk number %d - aborting!\n",
				mdname(mddev), j);
			goto abort;
		}
		if (dev[j]) {
			pr_warn("md/raid0:%s: multiple devices for %d - aborting!\n",
				mdname(mddev), j);
			goto abort;
		}
		dev[j] = rdev1;

		if (!smallest || (rdev1->sectors < smallest->sectors))
			smallest = rdev1;
		cnt++;
	}
	if (cnt != mddev->raid_disks) {
		pr_warn("md/raid0:%s: too few disks (%d of %d) - aborting!\n",
			mdname(mddev), cnt, mddev->raid_disks);
		goto abort;
	}
	zone->nb_dev = cnt;
	zone->zone_end = smallest->sectors * cnt;

	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;
		dev = conf->devlist + i * mddev->raid_disks;

		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];
			if (rdev->sectors <= zone->dev_start) {
				pr_debug("md/raid0:%s: checking %s ... nope\n",
					 mdname(mddev),
					 bdevname(rdev->bdev, b));
				continue;
			}
			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;
				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;
		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;

		pr_debug("md/raid0:%s: current zone start: %llu\n",
			 mdname(mddev),
			 (unsigned long long)smallest->sectors);
	}

	pr_debug("md/raid0:%s: done.\n", mdname(mddev));
	*private_conf = conf;

	return 0;
abort:
	kfree(conf->strip_zone);
	kfree(conf->devlist);
	kfree(conf);
	*private_conf = ERR_PTR(err);
	return err;
}

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82
8.16%
5
12.82%
Andrew Morton
26
2.59%
2
5.13%
Krzysztof Wojcik
21
2.09%
1
2.56%
Maciej Trela
21
2.09%
1
2.56%
Dan Carpenter
9
0.90%
1
2.56%
Heinz Mauelshagen
2
0.20%
1
2.56%
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2
0.20%
1
2.56%
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1005
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39
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/* 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();
}

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1
1.12%
1
14.29%
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89
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7
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/*
 * remaps the bio to the target device. we separate two flows.
 * power 2 flow and a general flow for the sake of performance
*/


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)];
}

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10
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1
16.67%
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1
0.56%
1
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6
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static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks)
{
	sector_t array_sectors = 0;
	struct md_rdev *rdev;

	WARN_ONCE(sectors || raid_disks,
		  "%s does not support generic reshape\n", __func__);

	rdev_for_each(rdev, mddev)
		array_sectors += (rdev->sectors &
				  ~(sector_t)(mddev->chunk_sectors-1));

	return array_sectors;
}

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static void raid0_free(struct mddev *mddev, void *priv);



static int raid0_run(struct mddev *mddev)
{
	struct r0conf *conf;
	int ret;

	if (mddev->chunk_sectors == 0) {
		pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev));
		return -EINVAL;
	}
	if (md_check_no_bitmap(mddev))
		return -EINVAL;

	/* if private is not null, we are here after takeover */
	if (mddev->private == NULL) {
		ret = create_strip_zones(mddev, &conf);
		if (ret < 0)
			return ret;
		mddev->private = conf;
	}
	conf = mddev->private;
	if (mddev->queue) {
		struct md_rdev *rdev;
		bool discard_supported = false;

		blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
		blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors);
		blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors);

		blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
		blk_queue_io_opt(mddev->queue,
				 (mddev->chunk_sectors << 9) * mddev->raid_disks);

		rdev_for_each(rdev, mddev) {
			disk_stack_limits(mddev->gendisk, rdev->bdev,
					  rdev->data_offset << 9);
			if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
				discard_supported = true;
		}
		if (!discard_supported)
			queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
		else
			queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
	}

	/* calculate array device size */
	md_set_array_sectors(mddev, raid0_size(mddev, 0, 0));

	pr_debug("md/raid0:%s: md_size is %llu sectors.\n",
		 mdname(mddev),
		 (unsigned long long)mddev->array_sectors);

	if (mddev->queue) {
		/* 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
                 * multiplied by chunk size times 2.
                 * If an individual device has an ra_pages greater than the
                 * chunk size, then we will not drive that device as hard as it
                 * wants.  We consider this a configuration error: a larger
                 * chunksize should be used in that case.
                 */
		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;
	}

	dump_zones(mddev);

	ret = md_integrity_register(mddev);

	return ret;
}

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2
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Heinz Mauelshagen
14
4.06%
1
3.33%
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3.48%
2
6.67%
Maciej Trela
12
3.48%
1
3.33%
Shaohua Li
11
3.19%
1
3.33%
Dan J Williams
8
2.32%
2
6.67%
Andrew Morton
7
2.03%
2
6.67%
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5
1.45%
1
3.33%
Jan Kara
2
0.58%
1
3.33%
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345
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30
100.00%



static void raid0_free(struct mddev *mddev, void *priv)
{
	struct r0conf *conf = priv;

	kfree(conf->strip_zone);
	kfree(conf->devlist);
	kfree(conf);
}

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/*
 * Is io distribute over 1 or more chunks ?
*/


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_iter.bi_sector & (chunk_sects-1))
					+ bio_sectors(bio));
	} else{
		sector_t sector = bio->bi_iter.bi_sector;
		return chunk_sects >= (sector_div(sector, chunk_sects)
						+ bio_sectors(bio));
	}
}

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40.00%
Neil Brown
3
3.49%
2
40.00%
Total
86
100.00%
5
100.00%



static void raid0_make_request(struct mddev *mddev, struct bio *bio)
{
	struct strip_zone *zone;
	struct md_rdev *tmp_dev;
	struct bio *split;

	if (unlikely(bio->bi_opf & REQ_PREFLUSH)) {
		md_flush_request(mddev, bio);
		return;
	}

	do {
		sector_t bio_sector = bio->bi_iter.bi_sector;
		sector_t sector = bio_sector;
		unsigned chunk_sects = mddev->chunk_sectors;

		unsigned sectors = chunk_sects -
			(likely(is_power_of_2(chunk_sects))
			 ? (sector & (chunk_sects-1))
			 : sector_div(sector, chunk_sects));

		/* Restore due to sector_div */
		sector = bio_sector;

		if (sectors < bio_sectors(bio)) {
			split = bio_split(bio, sectors, GFP_NOIO, fs_bio_set);
			bio_chain(split, bio);
		} else {
			split = bio;
		}

		zone = find_zone(mddev->private, &sector);
		tmp_dev = map_sector(mddev, zone, sector, &sector);
		split->bi_bdev = tmp_dev->bdev;
		split->bi_iter.bi_sector = sector + zone->dev_start +
			tmp_dev->data_offset;

		if (unlikely((bio_op(split) == REQ_OP_DISCARD) &&
			 !blk_queue_discard(bdev_get_queue(split->bi_bdev)))) {
			/* Just ignore it */
			bio_endio(split);
		} else {
			if (mddev->gendisk)
				trace_block_bio_remap(bdev_get_queue(split->bi_bdev),
						      split, disk_devt(mddev->gendisk),
						      bio_sector);
			mddev_check_writesame(mddev, split);
			generic_make_request(split);
		}
	} while (split != bio);
}

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34
12.01%
4
12.50%
Raz Ben-Jehuda (caro)
32
11.31%
1
3.12%
Shaohua Li
32
11.31%
2
6.25%
Christoph Hellwig
8
2.83%
2
6.25%
Andrew Morton
7
2.47%
2
6.25%
Michael Christie
6
2.12%
2
6.25%
Eric Work
4
1.41%
1
3.12%
Linus Torvalds
4
1.41%
1
3.12%
Al Viro
2
0.71%
1
3.12%
Andre Noll
2
0.71%
1
3.12%
Tejun Heo
1
0.35%
1
3.12%
Jens Axboe
1
0.35%
1
3.12%
Total
283
100.00%
32
100.00%



static void raid0_status(struct seq_file *seq, struct mddev *mddev)
{
	seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2);
	return;
}

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33.33%
Andre Noll
2
6.67%
1
16.67%
Total
30
100.00%
6
100.00%



static void *raid0_takeover_raid45(struct mddev *mddev)
{
	struct md_rdev *rdev;
	struct r0conf *priv_conf;

	if (mddev->degraded != 1) {
		pr_warn("md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n",
			mdname(mddev),
			mddev->degraded);
		return ERR_PTR(-EINVAL);
	}

	rdev_for_each(rdev, mddev) {
		/* check slot number for a disk */
		if (rdev->raid_disk == mddev->raid_disks-1) {
			pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n",
				mdname(mddev));
			return ERR_PTR(-EINVAL);
		}
		rdev->sectors = mddev->dev_sectors;
	}

	/* Set new parameters */
	mddev->new_level = 0;
	mddev->new_layout = 0;
	mddev->new_chunk_sectors = mddev->chunk_sectors;
	mddev->raid_disks--;
	mddev->delta_disks = -1;
	/* make sure it will be not marked as dirty */
	mddev->recovery_cp = MaxSector;
	mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS);

	create_strip_zones(mddev, &priv_conf);

	return priv_conf;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Maciej Trela
122
76.73%
3
25.00%
Neil Brown
30
18.87%
7
58.33%
Shaohua Li
7
4.40%
2
16.67%
Total
159
100.00%
12
100.00%



static void *raid0_takeover_raid10(struct mddev *mddev)
{
	struct r0conf *priv_conf;

	/* Check layout:
         *  - far_copies must be 1
         *  - near_copies must be 2
         *  - disks number must be even
         *  - all mirrors must be already degraded
         */
	if (mddev->layout != ((1 << 8) + 2)) {
		pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n",
			mdname(mddev),
			mddev->layout);
		return ERR_PTR(-EINVAL);
	}
	if (mddev->raid_disks & 1) {
		pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n",
			mdname(mddev));
		return ERR_PTR(-EINVAL);
	}
	if (mddev->degraded != (mddev->raid_disks>>1)) {
		pr_warn("md/raid0:%s: All mirrors must be already degraded!\n",
			mdname(mddev));
		return ERR_PTR(-EINVAL);
	}

	/* Set new parameters */
	mddev->new_level = 0;
	mddev->new_layout = 0;
	mddev->new_chunk_sectors = mddev->chunk_sectors;
	mddev->delta_disks = - mddev->raid_disks / 2;
	mddev->raid_disks += mddev->delta_disks;
	mddev->degraded = 0;
	/* make sure it will be not marked as dirty */
	mddev->recovery_cp = MaxSector;
	mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS);

	create_strip_zones(mddev, &priv_conf);
	return priv_conf;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Maciej Trela
156
82.98%
2
22.22%
Neil Brown
23
12.23%
4
44.44%
Shaohua Li
7
3.72%
2
22.22%
Masanari Iida
2
1.06%
1
11.11%
Total
188
100.00%
9
100.00%



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) {
		pr_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;
	mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS);

	create_strip_zones(mddev, &priv_conf);
	return priv_conf;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Krzysztof Wojcik
98
58.68%
2
25.00%
Jes Sorensen
57
34.13%
1
12.50%
Shaohua Li
7
4.19%
2
25.00%
Neil Brown
5
2.99%
3
37.50%
Total
167
100.00%
8
100.00%



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->bitmap) {
		pr_warn("md/raid0: %s: cannot takeover array with bitmap\n",
			mdname(mddev));
		return ERR_PTR(-EBUSY);
	}
	if (mddev->level == 4)
		return raid0_takeover_raid45(mddev);

	if (mddev->level == 5) {
		if (mddev->layout == ALGORITHM_PARITY_N)
			return raid0_takeover_raid45(mddev);

		pr_warn("md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n",
			mdname(mddev), ALGORITHM_PARITY_N);
	}

	if (mddev->level == 10)
		return raid0_takeover_raid10(mddev);

	if (mddev->level == 1)
		return raid0_takeover_raid1(mddev);

	pr_warn("Takeover from raid%i to raid0 not supported\n",
		mddev->level);

	return ERR_PTR(-EINVAL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Maciej Trela
74
56.06%
2
28.57%
Neil Brown
35
26.52%
4
57.14%
Krzysztof Wojcik
23
17.42%
1
14.29%
Total
132
100.00%
7
100.00%



static void raid0_quiesce(struct mddev *mddev, int state)
{
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Maciej Trela
11
84.62%
1
50.00%
Neil Brown
2
15.38%
1
50.00%
Total
13
100.00%
2
100.00%


static struct md_personality raid0_personality=
{
	.name		= "raid0",
	.level		= 0,
	.owner		= THIS_MODULE,
	.make_request	= raid0_make_request,
	.run		= raid0_run,
	.free		= raid0_free,
	.status		= raid0_status,
	.size		= raid0_size,
	.takeover	= raid0_takeover,
	.quiesce	= raid0_quiesce,
	.congested	= raid0_congested,
};



static int __init raid0_init (void)
{
	return register_md_personality (&raid0_personality);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
15
93.75%
2
66.67%
Linus Torvalds
1
6.25%
1
33.33%
Total
16
100.00%
3
100.00%



static void raid0_exit (void)
{
	unregister_md_personality (&raid0_personality);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
12
85.71%
2
66.67%
Neil Brown
2
14.29%
1
33.33%
Total
14
100.00%
3
100.00%


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");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Neil Brown
1477
44.85%
57
46.72%
Linus Torvalds (pre-git)
417
12.66%
9
7.38%
Maciej Trela
409
12.42%
3
2.46%
Raz Ben-Jehuda (caro)
309
9.38%
2
1.64%
Krzysztof Wojcik
142
4.31%
2
1.64%
Andre Noll
111
3.37%
9
7.38%
Kent Overstreet
79
2.40%
3
2.46%
Shaohua Li
71
2.16%
4
3.28%
Dan J Williams
60
1.82%
2
1.64%
Jes Sorensen
57
1.73%
1
0.82%
Andrew Morton
41
1.25%
5
4.10%
Peter Chubb
23
0.70%
1
0.82%
Heinz Mauelshagen
16
0.49%
2
1.64%
Jianpeng Ma (马建朋)
13
0.39%
1
0.82%
Martin K. Petersen
12
0.36%
2
1.64%
Linus Torvalds
10
0.30%
3
2.46%
Christoph Hellwig
9
0.27%
3
2.46%
Dan Carpenter
9
0.27%
1
0.82%
Michael Christie
6
0.18%
2
1.64%
Jens Axboe
5
0.15%
3
2.46%
Tejun Heo
4
0.12%
2
1.64%
Eric Work
4
0.12%
1
0.82%
Paul Gortmaker
3
0.09%
1
0.82%
Jan Kara
2
0.06%
1
0.82%
Masanari Iida
2
0.06%
1
0.82%
Al Viro
2
0.06%
1
0.82%
Total
3293
100.00%
122
100.00%
Directory: drivers/md

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