Something went wrong. Try again.
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844// SPDX-License-Identifier: GPL-2.0-or-later/* 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.
*/
#include <linux/blkdev.h>#include <linux/seq_file.h>#include <linux/module.h>#include <linux/slab.h>#include <linux/string_choices.h>#include <trace/events/block.h>#include "md.h"#include "raid0.h"#include "raid5.h"
static int default_layout = 0;module_param(default_layout, int, 0644);
#define UNSUPPORTED_MDDEV_FLAGS \ ((1L << MD_HAS_JOURNAL) | \ (1L << MD_JOURNAL_CLEAN) | \ (1L << MD_FAILFAST_SUPPORTED) |\ (1L << MD_HAS_PPL) | \ (1L << MD_HAS_MULTIPLE_PPLS) | \ (1L << MD_FAILLAST_DEV) | \ (1L << MD_SERIALIZE_POLICY))
/* * 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; 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, str_plural(conf->nr_strip_zones)); 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 += scnprintf(line+len, 200-len, "%s%pg", k?"/":"", conf->devlist[j * raid_disks + k]->bdev); 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; }}
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; struct r0conf *conf = kzalloc_obj(*conf); unsigned int blksize = 512;
if (!mddev_is_dm(mddev)) blksize = queue_logical_block_size(mddev->gendisk->queue);
*private_conf = ERR_PTR(-ENOMEM); if (!conf) return -ENOMEM; rdev_for_each(rdev1, mddev) { pr_debug("md/raid0:%s: looking at %pg\n", mdname(mddev), rdev1->bdev); c = 0;
/* round size to chunk_size */ sectors = rdev1->sectors; sector_div(sectors, mddev->chunk_sectors); rdev1->sectors = sectors * mddev->chunk_sectors;
if (mddev_is_dm(mddev)) blksize = max(blksize, queue_logical_block_size( rdev1->bdev->bd_disk->queue));
rdev_for_each(rdev2, mddev) { pr_debug("md/raid0:%s: comparing %pg(%llu)" " with %pg(%llu)\n", mdname(mddev), rdev1->bdev, (unsigned long long)rdev1->sectors, rdev2->bdev, (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 = kvzalloc_objs(struct strip_zone, conf->nr_strip_zones); if (!conf->strip_zone) goto abort; conf->devlist = kvzalloc(array3_size(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 %pg ... nope\n", mdname(mddev), rdev->bdev); continue; } pr_debug("md/raid0:%s: checking %pg ..." " contained as device %d\n", mdname(mddev), rdev->bdev, 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); }
if (conf->nr_strip_zones == 1 || conf->strip_zone[1].nb_dev == 1) { conf->layout = RAID0_ORIG_LAYOUT; } else if (mddev->layout == RAID0_ORIG_LAYOUT || mddev->layout == RAID0_ALT_MULTIZONE_LAYOUT) { conf->layout = mddev->layout; } else if (default_layout == RAID0_ORIG_LAYOUT || default_layout == RAID0_ALT_MULTIZONE_LAYOUT) { conf->layout = default_layout; } else { pr_err("md/raid0:%s: cannot assemble multi-zone RAID0 with default_layout setting\n", mdname(mddev)); pr_err("md/raid0: please set raid0.default_layout to 1 or 2\n"); err = -EOPNOTSUPP; goto abort; }
if (conf->layout == RAID0_ORIG_LAYOUT) { for (i = 1; i < conf->nr_strip_zones; i++) { sector_t first_sector = conf->strip_zone[i-1].zone_end;
sector_div(first_sector, mddev->chunk_sectors); zone = conf->strip_zone + i; /* disk_shift is first disk index used in the zone */ zone->disk_shift = sector_div(first_sector, zone->nb_dev); } }
pr_debug("md/raid0:%s: done.\n", mdname(mddev)); *private_conf = conf;
return 0;abort: kvfree(conf->strip_zone); kvfree(conf->devlist); kfree(conf); *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 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)];}
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;}
static void raid0_free(struct mddev *mddev, void *priv){ struct r0conf *conf = priv;
kvfree(conf->strip_zone); kvfree(conf->devlist); kfree(conf);}
static int raid0_set_limits(struct mddev *mddev){ struct queue_limits lim; int err;
md_init_stacking_limits(&lim); lim.max_hw_sectors = mddev->chunk_sectors; lim.max_write_zeroes_sectors = mddev->chunk_sectors; lim.max_hw_wzeroes_unmap_sectors = mddev->chunk_sectors; lim.logical_block_size = mddev->logical_block_size; lim.io_min = mddev->chunk_sectors << 9; lim.io_opt = lim.io_min * mddev->raid_disks; lim.chunk_sectors = mddev->chunk_sectors; lim.features |= BLK_FEAT_ATOMIC_WRITES; lim.features |= BLK_FEAT_PCI_P2PDMA; err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY); if (err) return err; return queue_limits_set(mddev->gendisk->queue, &lim);}
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 (!mddev_is_dm(mddev)) { ret = raid0_set_limits(mddev); if (ret) return ret; }
/* 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;
/* 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);
dump_zones(mddev);
return md_integrity_register(mddev);}
/* * Convert disk_index to the disk order in which it is read/written. * For example, if we have 4 disks, they are numbered 0,1,2,3. If we * write the disks starting at disk 3, then the read/write order would * be disk 3, then 0, then 1, and then disk 2 and we want map_disk_shift() * to map the disks as follows 0,1,2,3 => 1,2,3,0. So disk 0 would map * to 1, 1 to 2, 2 to 3, and 3 to 0. That way we can compare disks in * that 'output' space to understand the read/write disk ordering. */static int map_disk_shift(int disk_index, int num_disks, int disk_shift){ return ((disk_index + num_disks - disk_shift) % num_disks);}
static void raid0_handle_discard(struct mddev *mddev, struct bio *bio){ struct r0conf *conf = mddev->private; struct strip_zone *zone; sector_t start = bio->bi_iter.bi_sector; sector_t end; unsigned int stripe_size; sector_t first_stripe_index, last_stripe_index; sector_t start_disk_offset; unsigned int start_disk_index; sector_t end_disk_offset; unsigned int end_disk_index; unsigned int disk; sector_t orig_start, orig_end;
orig_start = start; zone = find_zone(conf, &start);
if (bio_end_sector(bio) > zone->zone_end) { bio = bio_submit_split_bioset(bio, zone->zone_end - bio->bi_iter.bi_sector, &mddev->bio_set); if (!bio) return;
end = zone->zone_end; } else { end = bio_end_sector(bio); }
orig_end = end; if (zone != conf->strip_zone) end = end - zone[-1].zone_end;
/* Now start and end is the offset in zone */ stripe_size = zone->nb_dev * mddev->chunk_sectors;
first_stripe_index = start; sector_div(first_stripe_index, stripe_size); last_stripe_index = end; sector_div(last_stripe_index, stripe_size);
/* In the first zone the original and alternate layouts are the same */ if ((conf->layout == RAID0_ORIG_LAYOUT) && (zone != conf->strip_zone)) { sector_div(orig_start, mddev->chunk_sectors); start_disk_index = sector_div(orig_start, zone->nb_dev); start_disk_index = map_disk_shift(start_disk_index, zone->nb_dev, zone->disk_shift); sector_div(orig_end, mddev->chunk_sectors); end_disk_index = sector_div(orig_end, zone->nb_dev); end_disk_index = map_disk_shift(end_disk_index, zone->nb_dev, zone->disk_shift); } else { start_disk_index = (int)(start - first_stripe_index * stripe_size) / mddev->chunk_sectors; end_disk_index = (int)(end - last_stripe_index * stripe_size) / mddev->chunk_sectors; } start_disk_offset = ((int)(start - first_stripe_index * stripe_size) % mddev->chunk_sectors) + first_stripe_index * mddev->chunk_sectors; end_disk_offset = ((int)(end - last_stripe_index * stripe_size) % mddev->chunk_sectors) + last_stripe_index * mddev->chunk_sectors;
for (disk = 0; disk < zone->nb_dev; disk++) { sector_t dev_start, dev_end; struct md_rdev *rdev; int compare_disk;
compare_disk = map_disk_shift(disk, zone->nb_dev, zone->disk_shift);
if (compare_disk < start_disk_index) dev_start = (first_stripe_index + 1) * mddev->chunk_sectors; else if (compare_disk > start_disk_index) dev_start = first_stripe_index * mddev->chunk_sectors; else dev_start = start_disk_offset;
if (compare_disk < end_disk_index) dev_end = (last_stripe_index + 1) * mddev->chunk_sectors; else if (compare_disk > end_disk_index) dev_end = last_stripe_index * mddev->chunk_sectors; else dev_end = end_disk_offset;
if (dev_end <= dev_start) continue;
rdev = conf->devlist[(zone - conf->strip_zone) * conf->strip_zone[0].nb_dev + disk]; md_submit_discard_bio(mddev, rdev, bio, dev_start + zone->dev_start + rdev->data_offset, dev_end - dev_start); } bio_endio(bio);}
static void raid0_map_submit_bio(struct mddev *mddev, struct bio *bio){ struct r0conf *conf = mddev->private; struct strip_zone *zone; struct md_rdev *tmp_dev; sector_t bio_sector = bio->bi_iter.bi_sector; sector_t sector = bio_sector;
md_account_bio(mddev, &bio);
zone = find_zone(mddev->private, §or); switch (conf->layout) { case RAID0_ORIG_LAYOUT: tmp_dev = map_sector(mddev, zone, bio_sector, §or); break; case RAID0_ALT_MULTIZONE_LAYOUT: tmp_dev = map_sector(mddev, zone, sector, §or); break; default: WARN(1, "md/raid0:%s: Invalid layout\n", mdname(mddev)); bio_io_error(bio); return; }
if (unlikely(is_rdev_broken(tmp_dev))) { bio_io_error(bio); md_error(mddev, tmp_dev); return; }
bio_set_dev(bio, tmp_dev->bdev); bio->bi_iter.bi_sector = sector + zone->dev_start + tmp_dev->data_offset; mddev_trace_remap(mddev, bio, bio_sector); mddev_check_write_zeroes(mddev, bio); submit_bio_noacct(bio);}
static bool raid0_make_request(struct mddev *mddev, struct bio *bio){ sector_t sector; unsigned chunk_sects; unsigned sectors;
if (unlikely(bio->bi_opf & REQ_PREFLUSH) && md_flush_request(mddev, bio)) return true;
if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) { raid0_handle_discard(mddev, bio); return true; }
sector = bio->bi_iter.bi_sector; chunk_sects = mddev->chunk_sectors;
sectors = chunk_sects - (likely(is_power_of_2(chunk_sects)) ? (sector & (chunk_sects-1)) : sector_div(sector, chunk_sects));
if (sectors < bio_sectors(bio)) { bio = bio_submit_split_bioset(bio, sectors, &mddev->bio_set); if (!bio) return true; }
raid0_map_submit_bio(mddev, bio); return true;}
static void raid0_status(struct seq_file *seq, struct mddev *mddev){ seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); return;}
static void raid0_error(struct mddev *mddev, struct md_rdev *rdev){ if (!test_and_set_bit(MD_BROKEN, &mddev->flags)) { char *md_name = mdname(mddev);
pr_crit("md/raid0%s: Disk failure on %pg detected, failing array.\n", md_name, rdev->bdev); }}
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->resync_offset = MaxSector; mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS);
create_strip_zones(mddev, &priv_conf);
return priv_conf;}
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->resync_offset = MaxSector; mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS);
create_strip_zones(mddev, &priv_conf); return priv_conf;}
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->resync_offset = MaxSector; mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS);
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->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);}
static void raid0_quiesce(struct mddev *mddev, int quiesce){}
static struct md_personality raid0_personality={ .head = { .type = MD_PERSONALITY, .id = ID_RAID0, .name = "raid0", .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, .error_handler = raid0_error,};
static int __init raid0_init(void){ return register_md_submodule(&raid0_personality.head);}
static void __exit raid0_exit(void){ unregister_md_submodule(&raid0_personality.head);}
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");