Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | raid0.c : Multiple Devices driver for Linux |
NeilBrown | f72ffdd | 2014-09-30 14:23:59 +1000 | [diff] [blame] | 3 | Copyright (C) 1994-96 Marc ZYNGIER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | <zyngier@ufr-info-p7.ibp.fr> or |
| 5 | <maz@gloups.fdn.fr> |
NeilBrown | f72ffdd | 2014-09-30 14:23:59 +1000 | [diff] [blame] | 6 | Copyright (C) 1999, 2000 Ingo Molnar, Red Hat |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | |
| 8 | RAID-0 management functions. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2, or (at your option) |
| 13 | any later version. |
NeilBrown | f72ffdd | 2014-09-30 14:23:59 +1000 | [diff] [blame] | 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | You should have received a copy of the GNU General Public License |
| 16 | (for example /usr/src/linux/COPYING); if not, write to the Free |
NeilBrown | f72ffdd | 2014-09-30 14:23:59 +1000 | [diff] [blame] | 17 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | */ |
| 19 | |
NeilBrown | bff6197 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 20 | #include <linux/blkdev.h> |
NeilBrown | bff6197 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 21 | #include <linux/seq_file.h> |
Paul Gortmaker | 056075c | 2011-07-03 13:58:33 -0400 | [diff] [blame] | 22 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 23 | #include <linux/slab.h> |
NeilBrown | 109e376 | 2016-11-18 13:22:04 +1100 | [diff] [blame] | 24 | #include <trace/events/block.h> |
NeilBrown | 43b2e5d | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 25 | #include "md.h" |
Christoph Hellwig | ef740c3 | 2009-03-31 14:27:03 +1100 | [diff] [blame] | 26 | #include "raid0.h" |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 27 | #include "raid5.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
NeilBrown | ca39e818 | 2019-09-09 16:30:02 +1000 | [diff] [blame] | 29 | static int default_layout = 0; |
| 30 | module_param(default_layout, int, 0644); |
| 31 | |
Shaohua Li | 394ed8e | 2017-01-04 16:10:19 -0800 | [diff] [blame] | 32 | #define UNSUPPORTED_MDDEV_FLAGS \ |
| 33 | ((1L << MD_HAS_JOURNAL) | \ |
| 34 | (1L << MD_JOURNAL_CLEAN) | \ |
Artur Paszkiewicz | ea0213e | 2017-03-09 09:59:57 +0100 | [diff] [blame] | 35 | (1L << MD_FAILFAST_SUPPORTED) |\ |
Pawel Baldysiak | ddc0882 | 2017-08-16 17:13:45 +0200 | [diff] [blame] | 36 | (1L << MD_HAS_PPL) | \ |
| 37 | (1L << MD_HAS_MULTIPLE_PPLS)) |
Shaohua Li | 394ed8e | 2017-01-04 16:10:19 -0800 | [diff] [blame] | 38 | |
NeilBrown | 5c675f8 | 2014-12-15 12:56:56 +1100 | [diff] [blame] | 39 | static int raid0_congested(struct mddev *mddev, int bits) |
NeilBrown | 26be34d | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 40 | { |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 41 | struct r0conf *conf = mddev->private; |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 42 | struct md_rdev **devlist = conf->devlist; |
NeilBrown | 84707f3 | 2010-03-16 17:23:35 +1100 | [diff] [blame] | 43 | int raid_disks = conf->strip_zone[0].nb_dev; |
NeilBrown | 26be34d | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 44 | int i, ret = 0; |
| 45 | |
NeilBrown | 84707f3 | 2010-03-16 17:23:35 +1100 | [diff] [blame] | 46 | for (i = 0; i < raid_disks && !ret ; i++) { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 47 | struct request_queue *q = bdev_get_queue(devlist[i]->bdev); |
NeilBrown | 26be34d | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 48 | |
Jan Kara | dc3b17c | 2017-02-02 15:56:50 +0100 | [diff] [blame] | 49 | ret |= bdi_congested(q->backing_dev_info, bits); |
NeilBrown | 26be34d | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 50 | } |
| 51 | return ret; |
| 52 | } |
| 53 | |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 54 | /* |
| 55 | * inform the user of the raid configuration |
| 56 | */ |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 57 | static void dump_zones(struct mddev *mddev) |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 58 | { |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 59 | int j, k; |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 60 | sector_t zone_size = 0; |
| 61 | sector_t zone_start = 0; |
| 62 | char b[BDEVNAME_SIZE]; |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 63 | struct r0conf *conf = mddev->private; |
NeilBrown | 84707f3 | 2010-03-16 17:23:35 +1100 | [diff] [blame] | 64 | int raid_disks = conf->strip_zone[0].nb_dev; |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 65 | pr_debug("md: RAID0 configuration for %s - %d zone%s\n", |
| 66 | mdname(mddev), |
| 67 | conf->nr_strip_zones, conf->nr_strip_zones==1?"":"s"); |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 68 | for (j = 0; j < conf->nr_strip_zones; j++) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 69 | char line[200]; |
| 70 | int len = 0; |
| 71 | |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 72 | for (k = 0; k < conf->strip_zone[j].nb_dev; k++) |
Saurabh Sengar | 3b0a2bd | 2022-08-23 11:51:04 -0700 | [diff] [blame] | 73 | len += scnprintf(line+len, 200-len, "%s%s", k?"/":"", |
| 74 | bdevname(conf->devlist[j*raid_disks |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 75 | + k]->bdev, b)); |
| 76 | pr_debug("md: zone%d=[%s]\n", j, line); |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 77 | |
| 78 | zone_size = conf->strip_zone[j].zone_end - zone_start; |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 79 | pr_debug(" zone-offset=%10lluKB, device-offset=%10lluKB, size=%10lluKB\n", |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 80 | (unsigned long long)zone_start>>1, |
| 81 | (unsigned long long)conf->strip_zone[j].dev_start>>1, |
| 82 | (unsigned long long)zone_size>>1); |
| 83 | zone_start = conf->strip_zone[j].zone_end; |
| 84 | } |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 85 | } |
| 86 | |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 87 | static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | { |
NeilBrown | a9f326e | 2009-09-23 18:06:41 +1000 | [diff] [blame] | 89 | int i, c, err; |
NeilBrown | 49f357a2 | 2009-06-16 16:50:35 +1000 | [diff] [blame] | 90 | sector_t curr_zone_end, sectors; |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 91 | struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | struct strip_zone *zone; |
| 93 | int cnt; |
| 94 | char b[BDEVNAME_SIZE]; |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 95 | char b2[BDEVNAME_SIZE]; |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 96 | struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL); |
Mikulas Patocka | 0c7a7d8 | 2020-01-15 08:35:25 -0500 | [diff] [blame] | 97 | unsigned blksize = 512; |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 98 | |
Dan Carpenter | 7dedd15 | 2016-04-14 12:31:49 +0300 | [diff] [blame] | 99 | *private_conf = ERR_PTR(-ENOMEM); |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 100 | if (!conf) |
| 101 | return -ENOMEM; |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 102 | rdev_for_each(rdev1, mddev) { |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 103 | pr_debug("md/raid0:%s: looking at %s\n", |
| 104 | mdname(mddev), |
| 105 | bdevname(rdev1->bdev, b)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | c = 0; |
NeilBrown | 13f2682 | 2009-06-18 08:48:55 +1000 | [diff] [blame] | 107 | |
| 108 | /* round size to chunk_size */ |
| 109 | sectors = rdev1->sectors; |
| 110 | sector_div(sectors, mddev->chunk_sectors); |
| 111 | rdev1->sectors = sectors * mddev->chunk_sectors; |
| 112 | |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 113 | blksize = max(blksize, queue_logical_block_size( |
| 114 | rdev1->bdev->bd_disk->queue)); |
| 115 | |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 116 | rdev_for_each(rdev2, mddev) { |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 117 | pr_debug("md/raid0:%s: comparing %s(%llu)" |
| 118 | " with %s(%llu)\n", |
| 119 | mdname(mddev), |
| 120 | bdevname(rdev1->bdev,b), |
| 121 | (unsigned long long)rdev1->sectors, |
| 122 | bdevname(rdev2->bdev,b2), |
| 123 | (unsigned long long)rdev2->sectors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | if (rdev2 == rdev1) { |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 125 | pr_debug("md/raid0:%s: END\n", |
| 126 | mdname(mddev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | break; |
| 128 | } |
Andre Noll | dd8ac33 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 129 | if (rdev2->sectors == rdev1->sectors) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | /* |
| 131 | * Not unique, don't count it as a new |
| 132 | * group |
| 133 | */ |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 134 | pr_debug("md/raid0:%s: EQUAL\n", |
| 135 | mdname(mddev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | c = 1; |
| 137 | break; |
| 138 | } |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 139 | pr_debug("md/raid0:%s: NOT EQUAL\n", |
| 140 | mdname(mddev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | } |
| 142 | if (!c) { |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 143 | pr_debug("md/raid0:%s: ==> UNIQUE\n", |
| 144 | mdname(mddev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | conf->nr_strip_zones++; |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 146 | pr_debug("md/raid0:%s: %d zones\n", |
| 147 | mdname(mddev), conf->nr_strip_zones); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | } |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 150 | pr_debug("md/raid0:%s: FINAL %d zones\n", |
| 151 | mdname(mddev), conf->nr_strip_zones); |
NeilBrown | ca39e818 | 2019-09-09 16:30:02 +1000 | [diff] [blame] | 152 | |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 153 | /* |
| 154 | * now since we have the hard sector sizes, we can make sure |
| 155 | * chunk size is a multiple of that sector size |
| 156 | */ |
| 157 | if ((mddev->chunk_sectors << 9) % blksize) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 158 | pr_warn("md/raid0:%s: chunk_size of %d not multiple of block size %d\n", |
| 159 | mdname(mddev), |
| 160 | mddev->chunk_sectors << 9, blksize); |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 161 | err = -EINVAL; |
| 162 | goto abort; |
| 163 | } |
| 164 | |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 165 | err = -ENOMEM; |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 166 | conf->strip_zone = kzalloc(sizeof(struct strip_zone)* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | conf->nr_strip_zones, GFP_KERNEL); |
| 168 | if (!conf->strip_zone) |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 169 | goto abort; |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 170 | conf->devlist = kzalloc(sizeof(struct md_rdev*)* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | conf->nr_strip_zones*mddev->raid_disks, |
| 172 | GFP_KERNEL); |
| 173 | if (!conf->devlist) |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 174 | goto abort; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | /* The first zone must contain all devices, so here we check that |
| 177 | * there is a proper alignment of slots to devices and find them all |
| 178 | */ |
| 179 | zone = &conf->strip_zone[0]; |
| 180 | cnt = 0; |
| 181 | smallest = NULL; |
NeilBrown | b414579 | 2009-06-16 16:50:52 +1000 | [diff] [blame] | 182 | dev = conf->devlist; |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 183 | err = -EINVAL; |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 184 | rdev_for_each(rdev1, mddev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | int j = rdev1->raid_disk; |
| 186 | |
NeilBrown | e93f68a | 2010-06-15 09:36:03 +0100 | [diff] [blame] | 187 | if (mddev->level == 10) { |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 188 | /* taking over a raid10-n2 array */ |
| 189 | j /= 2; |
NeilBrown | e93f68a | 2010-06-15 09:36:03 +0100 | [diff] [blame] | 190 | rdev1->new_raid_disk = j; |
| 191 | } |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 192 | |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 193 | if (mddev->level == 1) { |
| 194 | /* taiking over a raid1 array- |
| 195 | * we have only one active disk |
| 196 | */ |
| 197 | j = 0; |
| 198 | rdev1->new_raid_disk = j; |
| 199 | } |
| 200 | |
NeilBrown | f96c9f3 | 2013-02-21 15:50:07 +1100 | [diff] [blame] | 201 | if (j < 0) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 202 | pr_warn("md/raid0:%s: remove inactive devices before converting to RAID0\n", |
| 203 | mdname(mddev)); |
NeilBrown | f96c9f3 | 2013-02-21 15:50:07 +1100 | [diff] [blame] | 204 | goto abort; |
| 205 | } |
| 206 | if (j >= mddev->raid_disks) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 207 | pr_warn("md/raid0:%s: bad disk number %d - aborting!\n", |
| 208 | mdname(mddev), j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | goto abort; |
| 210 | } |
NeilBrown | b414579 | 2009-06-16 16:50:52 +1000 | [diff] [blame] | 211 | if (dev[j]) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 212 | pr_warn("md/raid0:%s: multiple devices for %d - aborting!\n", |
| 213 | mdname(mddev), j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | goto abort; |
| 215 | } |
NeilBrown | b414579 | 2009-06-16 16:50:52 +1000 | [diff] [blame] | 216 | dev[j] = rdev1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
Andre Noll | dd8ac33 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 218 | if (!smallest || (rdev1->sectors < smallest->sectors)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | smallest = rdev1; |
| 220 | cnt++; |
| 221 | } |
| 222 | if (cnt != mddev->raid_disks) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 223 | pr_warn("md/raid0:%s: too few disks (%d of %d) - aborting!\n", |
| 224 | mdname(mddev), cnt, mddev->raid_disks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | goto abort; |
| 226 | } |
| 227 | zone->nb_dev = cnt; |
NeilBrown | 49f357a2 | 2009-06-16 16:50:35 +1000 | [diff] [blame] | 228 | zone->zone_end = smallest->sectors * cnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | |
NeilBrown | 49f357a2 | 2009-06-16 16:50:35 +1000 | [diff] [blame] | 230 | curr_zone_end = zone->zone_end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
| 232 | /* now do the other zones */ |
| 233 | for (i = 1; i < conf->nr_strip_zones; i++) |
| 234 | { |
NeilBrown | a9f326e | 2009-09-23 18:06:41 +1000 | [diff] [blame] | 235 | int j; |
| 236 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | zone = conf->strip_zone + i; |
NeilBrown | b414579 | 2009-06-16 16:50:52 +1000 | [diff] [blame] | 238 | dev = conf->devlist + i * mddev->raid_disks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 240 | pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i); |
NeilBrown | d27a43ab | 2009-06-16 16:46:46 +1000 | [diff] [blame] | 241 | zone->dev_start = smallest->sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | smallest = NULL; |
| 243 | c = 0; |
| 244 | |
| 245 | for (j=0; j<cnt; j++) { |
NeilBrown | b414579 | 2009-06-16 16:50:52 +1000 | [diff] [blame] | 246 | rdev = conf->devlist[j]; |
NeilBrown | d27a43ab | 2009-06-16 16:46:46 +1000 | [diff] [blame] | 247 | if (rdev->sectors <= zone->dev_start) { |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 248 | pr_debug("md/raid0:%s: checking %s ... nope\n", |
| 249 | mdname(mddev), |
| 250 | bdevname(rdev->bdev, b)); |
Andre Noll | dd8ac33 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 251 | continue; |
| 252 | } |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 253 | pr_debug("md/raid0:%s: checking %s ..." |
| 254 | " contained as device %d\n", |
| 255 | mdname(mddev), |
| 256 | bdevname(rdev->bdev, b), c); |
NeilBrown | b414579 | 2009-06-16 16:50:52 +1000 | [diff] [blame] | 257 | dev[c] = rdev; |
Andre Noll | dd8ac33 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 258 | c++; |
| 259 | if (!smallest || rdev->sectors < smallest->sectors) { |
| 260 | smallest = rdev; |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 261 | pr_debug("md/raid0:%s: (%llu) is smallest!.\n", |
| 262 | mdname(mddev), |
| 263 | (unsigned long long)rdev->sectors); |
Andre Noll | dd8ac33 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 264 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
| 266 | |
| 267 | zone->nb_dev = c; |
NeilBrown | 49f357a2 | 2009-06-16 16:50:35 +1000 | [diff] [blame] | 268 | sectors = (smallest->sectors - zone->dev_start) * c; |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 269 | pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n", |
| 270 | mdname(mddev), |
| 271 | zone->nb_dev, (unsigned long long)sectors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
NeilBrown | 49f357a2 | 2009-06-16 16:50:35 +1000 | [diff] [blame] | 273 | curr_zone_end += sectors; |
NeilBrown | d27a43ab | 2009-06-16 16:46:46 +1000 | [diff] [blame] | 274 | zone->zone_end = curr_zone_end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 276 | pr_debug("md/raid0:%s: current zone start: %llu\n", |
| 277 | mdname(mddev), |
| 278 | (unsigned long long)smallest->sectors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | |
Pascal Hambourg | c2e6681 | 2022-04-13 08:53:56 +0200 | [diff] [blame] | 281 | if (conf->nr_strip_zones == 1 || conf->strip_zone[1].nb_dev == 1) { |
| 282 | conf->layout = RAID0_ORIG_LAYOUT; |
| 283 | } else if (mddev->layout == RAID0_ORIG_LAYOUT || |
| 284 | mddev->layout == RAID0_ALT_MULTIZONE_LAYOUT) { |
| 285 | conf->layout = mddev->layout; |
| 286 | } else if (default_layout == RAID0_ORIG_LAYOUT || |
| 287 | default_layout == RAID0_ALT_MULTIZONE_LAYOUT) { |
| 288 | conf->layout = default_layout; |
| 289 | } else { |
| 290 | pr_err("md/raid0:%s: cannot assemble multi-zone RAID0 with default_layout setting\n", |
| 291 | mdname(mddev)); |
| 292 | pr_err("md/raid0: please set raid0.default_layout to 1 or 2\n"); |
| 293 | err = -EOPNOTSUPP; |
| 294 | goto abort; |
| 295 | } |
| 296 | |
Jason Baron | 7bf29ed | 2023-06-23 14:05:23 -0400 | [diff] [blame] | 297 | if (conf->layout == RAID0_ORIG_LAYOUT) { |
| 298 | for (i = 1; i < conf->nr_strip_zones; i++) { |
| 299 | sector_t first_sector = conf->strip_zone[i-1].zone_end; |
| 300 | |
| 301 | sector_div(first_sector, mddev->chunk_sectors); |
| 302 | zone = conf->strip_zone + i; |
| 303 | /* disk_shift is first disk index used in the zone */ |
| 304 | zone->disk_shift = sector_div(first_sector, |
| 305 | zone->nb_dev); |
| 306 | } |
| 307 | } |
| 308 | |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 309 | pr_debug("md/raid0:%s: done.\n", mdname(mddev)); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 310 | *private_conf = conf; |
| 311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | return 0; |
Andre Noll | 5568a60 | 2009-06-16 16:47:21 +1000 | [diff] [blame] | 313 | abort: |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 314 | kfree(conf->strip_zone); |
| 315 | kfree(conf->devlist); |
| 316 | kfree(conf); |
NeilBrown | 58ebb34 | 2013-02-21 15:36:38 +1100 | [diff] [blame] | 317 | *private_conf = ERR_PTR(err); |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 318 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | } |
| 320 | |
NeilBrown | ba13da4 | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 321 | /* Find the zone which holds a particular offset |
| 322 | * Update *sectorp to be an offset in that zone |
| 323 | */ |
| 324 | static struct strip_zone *find_zone(struct r0conf *conf, |
| 325 | sector_t *sectorp) |
| 326 | { |
| 327 | int i; |
| 328 | struct strip_zone *z = conf->strip_zone; |
| 329 | sector_t sector = *sectorp; |
| 330 | |
| 331 | for (i = 0; i < conf->nr_strip_zones; i++) |
| 332 | if (sector < z[i].zone_end) { |
| 333 | if (i) |
| 334 | *sectorp = sector - z[i-1].zone_end; |
| 335 | return z + i; |
| 336 | } |
| 337 | BUG(); |
| 338 | } |
| 339 | |
| 340 | /* |
| 341 | * remaps the bio to the target device. we separate two flows. |
NeilBrown | 47d6897 | 2015-04-10 13:19:04 +1000 | [diff] [blame] | 342 | * power 2 flow and a general flow for the sake of performance |
NeilBrown | ba13da4 | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 343 | */ |
| 344 | static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone, |
| 345 | sector_t sector, sector_t *sector_offset) |
| 346 | { |
| 347 | unsigned int sect_in_chunk; |
| 348 | sector_t chunk; |
| 349 | struct r0conf *conf = mddev->private; |
| 350 | int raid_disks = conf->strip_zone[0].nb_dev; |
| 351 | unsigned int chunk_sects = mddev->chunk_sectors; |
| 352 | |
| 353 | if (is_power_of_2(chunk_sects)) { |
| 354 | int chunksect_bits = ffz(~chunk_sects); |
| 355 | /* find the sector offset inside the chunk */ |
| 356 | sect_in_chunk = sector & (chunk_sects - 1); |
| 357 | sector >>= chunksect_bits; |
| 358 | /* chunk in zone */ |
| 359 | chunk = *sector_offset; |
| 360 | /* quotient is the chunk in real device*/ |
| 361 | sector_div(chunk, zone->nb_dev << chunksect_bits); |
| 362 | } else{ |
| 363 | sect_in_chunk = sector_div(sector, chunk_sects); |
| 364 | chunk = *sector_offset; |
| 365 | sector_div(chunk, chunk_sects * zone->nb_dev); |
| 366 | } |
| 367 | /* |
| 368 | * position the bio over the real device |
| 369 | * real sector = chunk in device + starting of zone |
| 370 | * + the position in the chunk |
| 371 | */ |
| 372 | *sector_offset = (chunk * chunk_sects) + sect_in_chunk; |
| 373 | return conf->devlist[(zone - conf->strip_zone)*raid_disks |
| 374 | + sector_div(sector, zone->nb_dev)]; |
| 375 | } |
| 376 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 377 | static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
Dan Williams | 80c3a6c | 2009-03-17 18:10:40 -0700 | [diff] [blame] | 378 | { |
| 379 | sector_t array_sectors = 0; |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 380 | struct md_rdev *rdev; |
Dan Williams | 80c3a6c | 2009-03-17 18:10:40 -0700 | [diff] [blame] | 381 | |
| 382 | WARN_ONCE(sectors || raid_disks, |
| 383 | "%s does not support generic reshape\n", __func__); |
| 384 | |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 385 | rdev_for_each(rdev, mddev) |
NeilBrown | a646853 | 2013-02-21 14:33:17 +1100 | [diff] [blame] | 386 | array_sectors += (rdev->sectors & |
| 387 | ~(sector_t)(mddev->chunk_sectors-1)); |
Dan Williams | 80c3a6c | 2009-03-17 18:10:40 -0700 | [diff] [blame] | 388 | |
| 389 | return array_sectors; |
| 390 | } |
| 391 | |
NeilBrown | afa0f55 | 2014-12-15 12:56:58 +1100 | [diff] [blame] | 392 | static void raid0_free(struct mddev *mddev, void *priv); |
majianpeng | 0366ef8 | 2012-04-02 09:48:37 +1000 | [diff] [blame] | 393 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 394 | static int raid0_run(struct mddev *mddev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | { |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 396 | struct r0conf *conf; |
Andre Noll | 5568a60 | 2009-06-16 16:47:21 +1000 | [diff] [blame] | 397 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
Andre Noll | 9d8f036 | 2009-06-18 08:45:01 +1000 | [diff] [blame] | 399 | if (mddev->chunk_sectors == 0) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 400 | pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev)); |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 401 | return -EINVAL; |
| 402 | } |
Andre Noll | 0894cc3 | 2009-06-18 08:49:23 +1000 | [diff] [blame] | 403 | if (md_check_no_bitmap(mddev)) |
| 404 | return -EINVAL; |
Heinz Mauelshagen | 753f285 | 2015-02-13 19:48:01 +0100 | [diff] [blame] | 405 | |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 406 | /* if private is not null, we are here after takeover */ |
| 407 | if (mddev->private == NULL) { |
| 408 | ret = create_strip_zones(mddev, &conf); |
| 409 | if (ret < 0) |
| 410 | return ret; |
| 411 | mddev->private = conf; |
| 412 | } |
| 413 | conf = mddev->private; |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 414 | if (mddev->queue) { |
| 415 | struct md_rdev *rdev; |
| 416 | bool discard_supported = false; |
| 417 | |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 418 | blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors); |
| 419 | blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors); |
Christoph Hellwig | 3deff1a | 2017-04-05 19:21:03 +0200 | [diff] [blame] | 420 | blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors); |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 421 | blk_queue_max_discard_sectors(mddev->queue, UINT_MAX); |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 422 | |
| 423 | blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9); |
| 424 | blk_queue_io_opt(mddev->queue, |
| 425 | (mddev->chunk_sectors << 9) * mddev->raid_disks); |
| 426 | |
NeilBrown | 66eefe5 | 2015-09-24 15:47:47 +1000 | [diff] [blame] | 427 | rdev_for_each(rdev, mddev) { |
| 428 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
| 429 | rdev->data_offset << 9); |
| 430 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
| 431 | discard_supported = true; |
| 432 | } |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 433 | if (!discard_supported) |
| 434 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); |
| 435 | else |
| 436 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); |
| 437 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
| 439 | /* calculate array device size */ |
Dan Williams | 1f40362 | 2009-03-31 14:59:03 +1100 | [diff] [blame] | 440 | md_set_array_sectors(mddev, raid0_size(mddev, 0, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 442 | pr_debug("md/raid0:%s: md_size is %llu sectors.\n", |
| 443 | mdname(mddev), |
| 444 | (unsigned long long)mddev->array_sectors); |
Heinz Mauelshagen | 753f285 | 2015-02-13 19:48:01 +0100 | [diff] [blame] | 445 | |
| 446 | if (mddev->queue) { |
| 447 | /* calculate the max read-ahead size. |
| 448 | * For read-ahead of large files to be effective, we need to |
| 449 | * readahead at least twice a whole stripe. i.e. number of devices |
| 450 | * multiplied by chunk size times 2. |
| 451 | * If an individual device has an ra_pages greater than the |
| 452 | * chunk size, then we will not drive that device as hard as it |
| 453 | * wants. We consider this a configuration error: a larger |
| 454 | * chunksize should be used in that case. |
| 455 | */ |
Andre Noll | 9d8f036 | 2009-06-18 08:45:01 +1000 | [diff] [blame] | 456 | int stripe = mddev->raid_disks * |
| 457 | (mddev->chunk_sectors << 9) / PAGE_SIZE; |
Jan Kara | dc3b17c | 2017-02-02 15:56:50 +0100 | [diff] [blame] | 458 | if (mddev->queue->backing_dev_info->ra_pages < 2* stripe) |
| 459 | mddev->queue->backing_dev_info->ra_pages = 2* stripe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
| 461 | |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 462 | dump_zones(mddev); |
majianpeng | 0366ef8 | 2012-04-02 09:48:37 +1000 | [diff] [blame] | 463 | |
| 464 | ret = md_integrity_register(mddev); |
majianpeng | 0366ef8 | 2012-04-02 09:48:37 +1000 | [diff] [blame] | 465 | |
| 466 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | } |
| 468 | |
NeilBrown | afa0f55 | 2014-12-15 12:56:58 +1100 | [diff] [blame] | 469 | static void raid0_free(struct mddev *mddev, void *priv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | { |
NeilBrown | afa0f55 | 2014-12-15 12:56:58 +1100 | [diff] [blame] | 471 | struct r0conf *conf = priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
Jesper Juhl | 990a8ba | 2005-06-21 17:17:30 -0700 | [diff] [blame] | 473 | kfree(conf->strip_zone); |
Andre Noll | fb5ab4b | 2009-06-16 16:48:19 +1000 | [diff] [blame] | 474 | kfree(conf->devlist); |
Jesper Juhl | 990a8ba | 2005-06-21 17:17:30 -0700 | [diff] [blame] | 475 | kfree(conf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | } |
| 477 | |
raz ben yehuda | fbb704e | 2009-06-16 17:02:05 +1000 | [diff] [blame] | 478 | /* |
| 479 | * Is io distribute over 1 or more chunks ? |
| 480 | */ |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 481 | static inline int is_io_in_chunk_boundary(struct mddev *mddev, |
raz ben yehuda | fbb704e | 2009-06-16 17:02:05 +1000 | [diff] [blame] | 482 | unsigned int chunk_sects, struct bio *bio) |
| 483 | { |
NeilBrown | d6e412e | 2009-06-18 08:47:00 +1000 | [diff] [blame] | 484 | if (likely(is_power_of_2(chunk_sects))) { |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 485 | return chunk_sects >= |
| 486 | ((bio->bi_iter.bi_sector & (chunk_sects-1)) |
Kent Overstreet | aa8b57a | 2013-02-05 15:19:29 -0800 | [diff] [blame] | 487 | + bio_sectors(bio)); |
raz ben yehuda | fbb704e | 2009-06-16 17:02:05 +1000 | [diff] [blame] | 488 | } else{ |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 489 | sector_t sector = bio->bi_iter.bi_sector; |
raz ben yehuda | fbb704e | 2009-06-16 17:02:05 +1000 | [diff] [blame] | 490 | return chunk_sects >= (sector_div(sector, chunk_sects) |
Kent Overstreet | aa8b57a | 2013-02-05 15:19:29 -0800 | [diff] [blame] | 491 | + bio_sectors(bio)); |
raz ben yehuda | fbb704e | 2009-06-16 17:02:05 +1000 | [diff] [blame] | 492 | } |
| 493 | } |
| 494 | |
Jason Baron | 7bf29ed | 2023-06-23 14:05:23 -0400 | [diff] [blame] | 495 | /* |
| 496 | * Convert disk_index to the disk order in which it is read/written. |
| 497 | * For example, if we have 4 disks, they are numbered 0,1,2,3. If we |
| 498 | * write the disks starting at disk 3, then the read/write order would |
| 499 | * be disk 3, then 0, then 1, and then disk 2 and we want map_disk_shift() |
| 500 | * to map the disks as follows 0,1,2,3 => 1,2,3,0. So disk 0 would map |
| 501 | * to 1, 1 to 2, 2 to 3, and 3 to 0. That way we can compare disks in |
| 502 | * that 'output' space to understand the read/write disk ordering. |
| 503 | */ |
| 504 | static int map_disk_shift(int disk_index, int num_disks, int disk_shift) |
| 505 | { |
| 506 | return ((disk_index + num_disks - disk_shift) % num_disks); |
| 507 | } |
| 508 | |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 509 | static void raid0_handle_discard(struct mddev *mddev, struct bio *bio) |
| 510 | { |
| 511 | struct r0conf *conf = mddev->private; |
| 512 | struct strip_zone *zone; |
| 513 | sector_t start = bio->bi_iter.bi_sector; |
| 514 | sector_t end; |
| 515 | unsigned int stripe_size; |
| 516 | sector_t first_stripe_index, last_stripe_index; |
| 517 | sector_t start_disk_offset; |
| 518 | unsigned int start_disk_index; |
| 519 | sector_t end_disk_offset; |
| 520 | unsigned int end_disk_index; |
| 521 | unsigned int disk; |
Jason Baron | 7bf29ed | 2023-06-23 14:05:23 -0400 | [diff] [blame] | 522 | sector_t orig_start, orig_end; |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 523 | |
Jason Baron | 7bf29ed | 2023-06-23 14:05:23 -0400 | [diff] [blame] | 524 | orig_start = start; |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 525 | zone = find_zone(conf, &start); |
| 526 | |
| 527 | if (bio_end_sector(bio) > zone->zone_end) { |
| 528 | struct bio *split = bio_split(bio, |
| 529 | zone->zone_end - bio->bi_iter.bi_sector, GFP_NOIO, |
| 530 | mddev->bio_set); |
| 531 | bio_chain(split, bio); |
| 532 | generic_make_request(bio); |
| 533 | bio = split; |
| 534 | end = zone->zone_end; |
| 535 | } else |
| 536 | end = bio_end_sector(bio); |
| 537 | |
Jason Baron | 7bf29ed | 2023-06-23 14:05:23 -0400 | [diff] [blame] | 538 | orig_end = end; |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 539 | if (zone != conf->strip_zone) |
| 540 | end = end - zone[-1].zone_end; |
| 541 | |
| 542 | /* Now start and end is the offset in zone */ |
| 543 | stripe_size = zone->nb_dev * mddev->chunk_sectors; |
| 544 | |
| 545 | first_stripe_index = start; |
| 546 | sector_div(first_stripe_index, stripe_size); |
| 547 | last_stripe_index = end; |
| 548 | sector_div(last_stripe_index, stripe_size); |
| 549 | |
Jason Baron | 7bf29ed | 2023-06-23 14:05:23 -0400 | [diff] [blame] | 550 | /* In the first zone the original and alternate layouts are the same */ |
| 551 | if ((conf->layout == RAID0_ORIG_LAYOUT) && (zone != conf->strip_zone)) { |
| 552 | sector_div(orig_start, mddev->chunk_sectors); |
| 553 | start_disk_index = sector_div(orig_start, zone->nb_dev); |
| 554 | start_disk_index = map_disk_shift(start_disk_index, |
| 555 | zone->nb_dev, |
| 556 | zone->disk_shift); |
| 557 | sector_div(orig_end, mddev->chunk_sectors); |
| 558 | end_disk_index = sector_div(orig_end, zone->nb_dev); |
| 559 | end_disk_index = map_disk_shift(end_disk_index, |
| 560 | zone->nb_dev, zone->disk_shift); |
| 561 | } else { |
| 562 | start_disk_index = (int)(start - first_stripe_index * stripe_size) / |
| 563 | mddev->chunk_sectors; |
| 564 | end_disk_index = (int)(end - last_stripe_index * stripe_size) / |
| 565 | mddev->chunk_sectors; |
| 566 | } |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 567 | start_disk_offset = ((int)(start - first_stripe_index * stripe_size) % |
| 568 | mddev->chunk_sectors) + |
| 569 | first_stripe_index * mddev->chunk_sectors; |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 570 | end_disk_offset = ((int)(end - last_stripe_index * stripe_size) % |
| 571 | mddev->chunk_sectors) + |
| 572 | last_stripe_index * mddev->chunk_sectors; |
| 573 | |
| 574 | for (disk = 0; disk < zone->nb_dev; disk++) { |
| 575 | sector_t dev_start, dev_end; |
| 576 | struct bio *discard_bio = NULL; |
| 577 | struct md_rdev *rdev; |
Jason Baron | 7bf29ed | 2023-06-23 14:05:23 -0400 | [diff] [blame] | 578 | int compare_disk; |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 579 | |
Jason Baron | 7bf29ed | 2023-06-23 14:05:23 -0400 | [diff] [blame] | 580 | compare_disk = map_disk_shift(disk, zone->nb_dev, |
| 581 | zone->disk_shift); |
| 582 | |
| 583 | if (compare_disk < start_disk_index) |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 584 | dev_start = (first_stripe_index + 1) * |
| 585 | mddev->chunk_sectors; |
Jason Baron | 7bf29ed | 2023-06-23 14:05:23 -0400 | [diff] [blame] | 586 | else if (compare_disk > start_disk_index) |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 587 | dev_start = first_stripe_index * mddev->chunk_sectors; |
| 588 | else |
| 589 | dev_start = start_disk_offset; |
| 590 | |
Jason Baron | 7bf29ed | 2023-06-23 14:05:23 -0400 | [diff] [blame] | 591 | if (compare_disk < end_disk_index) |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 592 | dev_end = (last_stripe_index + 1) * mddev->chunk_sectors; |
Jason Baron | 7bf29ed | 2023-06-23 14:05:23 -0400 | [diff] [blame] | 593 | else if (compare_disk > end_disk_index) |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 594 | dev_end = last_stripe_index * mddev->chunk_sectors; |
| 595 | else |
| 596 | dev_end = end_disk_offset; |
| 597 | |
| 598 | if (dev_end <= dev_start) |
| 599 | continue; |
| 600 | |
| 601 | rdev = conf->devlist[(zone - conf->strip_zone) * |
| 602 | conf->strip_zone[0].nb_dev + disk]; |
| 603 | if (__blkdev_issue_discard(rdev->bdev, |
| 604 | dev_start + zone->dev_start + rdev->data_offset, |
| 605 | dev_end - dev_start, GFP_NOIO, 0, &discard_bio) || |
| 606 | !discard_bio) |
| 607 | continue; |
| 608 | bio_chain(discard_bio, bio); |
Shaohua Li | 8a8e6f8 | 2017-08-18 10:27:59 -0700 | [diff] [blame] | 609 | bio_clone_blkcg_association(discard_bio, bio); |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 610 | if (mddev->gendisk) |
| 611 | trace_block_bio_remap(bdev_get_queue(rdev->bdev), |
| 612 | discard_bio, disk_devt(mddev->gendisk), |
| 613 | bio->bi_iter.bi_sector); |
| 614 | generic_make_request(discard_bio); |
| 615 | } |
| 616 | bio_endio(bio); |
| 617 | } |
| 618 | |
NeilBrown | cc27b0c | 2017-06-05 16:49:39 +1000 | [diff] [blame] | 619 | static bool raid0_make_request(struct mddev *mddev, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | { |
NeilBrown | ca39e818 | 2019-09-09 16:30:02 +1000 | [diff] [blame] | 621 | struct r0conf *conf = mddev->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | struct strip_zone *zone; |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 623 | struct md_rdev *tmp_dev; |
NeilBrown | f00d7c8 | 2017-04-05 14:05:51 +1000 | [diff] [blame] | 624 | sector_t bio_sector; |
| 625 | sector_t sector; |
NeilBrown | ca39e818 | 2019-09-09 16:30:02 +1000 | [diff] [blame] | 626 | sector_t orig_sector; |
NeilBrown | f00d7c8 | 2017-04-05 14:05:51 +1000 | [diff] [blame] | 627 | unsigned chunk_sects; |
| 628 | unsigned sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 630 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { |
Tejun Heo | e9c7469 | 2010-09-03 11:56:18 +0200 | [diff] [blame] | 631 | md_flush_request(mddev, bio); |
NeilBrown | cc27b0c | 2017-06-05 16:49:39 +1000 | [diff] [blame] | 632 | return true; |
NeilBrown | e5dcdd8 | 2005-09-09 16:23:41 -0700 | [diff] [blame] | 633 | } |
| 634 | |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 635 | if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) { |
| 636 | raid0_handle_discard(mddev, bio); |
NeilBrown | cc27b0c | 2017-06-05 16:49:39 +1000 | [diff] [blame] | 637 | return true; |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 638 | } |
| 639 | |
NeilBrown | f00d7c8 | 2017-04-05 14:05:51 +1000 | [diff] [blame] | 640 | bio_sector = bio->bi_iter.bi_sector; |
| 641 | sector = bio_sector; |
| 642 | chunk_sects = mddev->chunk_sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
NeilBrown | f00d7c8 | 2017-04-05 14:05:51 +1000 | [diff] [blame] | 644 | sectors = chunk_sects - |
| 645 | (likely(is_power_of_2(chunk_sects)) |
| 646 | ? (sector & (chunk_sects-1)) |
| 647 | : sector_div(sector, chunk_sects)); |
Christoph Hellwig | 5a7bbad | 2011-09-12 12:12:01 +0200 | [diff] [blame] | 648 | |
NeilBrown | f00d7c8 | 2017-04-05 14:05:51 +1000 | [diff] [blame] | 649 | /* Restore due to sector_div */ |
| 650 | sector = bio_sector; |
Eric Work | a811577 | 2015-05-18 23:26:23 -0700 | [diff] [blame] | 651 | |
NeilBrown | f00d7c8 | 2017-04-05 14:05:51 +1000 | [diff] [blame] | 652 | if (sectors < bio_sectors(bio)) { |
| 653 | struct bio *split = bio_split(bio, sectors, GFP_NOIO, mddev->bio_set); |
| 654 | bio_chain(split, bio); |
| 655 | generic_make_request(bio); |
| 656 | bio = split; |
| 657 | } |
Shaohua Li | c83057a | 2012-10-11 13:25:44 +1100 | [diff] [blame] | 658 | |
NeilBrown | ca39e818 | 2019-09-09 16:30:02 +1000 | [diff] [blame] | 659 | orig_sector = sector; |
NeilBrown | f00d7c8 | 2017-04-05 14:05:51 +1000 | [diff] [blame] | 660 | zone = find_zone(mddev->private, §or); |
NeilBrown | ca39e818 | 2019-09-09 16:30:02 +1000 | [diff] [blame] | 661 | switch (conf->layout) { |
| 662 | case RAID0_ORIG_LAYOUT: |
| 663 | tmp_dev = map_sector(mddev, zone, orig_sector, §or); |
| 664 | break; |
| 665 | case RAID0_ALT_MULTIZONE_LAYOUT: |
| 666 | tmp_dev = map_sector(mddev, zone, sector, §or); |
| 667 | break; |
| 668 | default: |
Dan Carpenter | 8f873b8 | 2019-09-21 09:00:31 +0300 | [diff] [blame] | 669 | WARN(1, "md/raid0:%s: Invalid layout\n", mdname(mddev)); |
NeilBrown | ca39e818 | 2019-09-09 16:30:02 +1000 | [diff] [blame] | 670 | bio_io_error(bio); |
| 671 | return true; |
| 672 | } |
| 673 | |
Christoph Hellwig | 74d4699 | 2017-08-23 19:10:32 +0200 | [diff] [blame] | 674 | bio_set_dev(bio, tmp_dev->bdev); |
NeilBrown | f00d7c8 | 2017-04-05 14:05:51 +1000 | [diff] [blame] | 675 | bio->bi_iter.bi_sector = sector + zone->dev_start + |
| 676 | tmp_dev->data_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 678 | if (mddev->gendisk) |
Christoph Hellwig | 74d4699 | 2017-08-23 19:10:32 +0200 | [diff] [blame] | 679 | trace_block_bio_remap(bio->bi_disk->queue, bio, |
| 680 | disk_devt(mddev->gendisk), bio_sector); |
Shaohua Li | 29efc39 | 2017-05-07 17:36:24 -0700 | [diff] [blame] | 681 | mddev_check_writesame(mddev, bio); |
| 682 | mddev_check_write_zeroes(mddev, bio); |
| 683 | generic_make_request(bio); |
NeilBrown | cc27b0c | 2017-06-05 16:49:39 +1000 | [diff] [blame] | 684 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | } |
NeilBrown | 8299d7f | 2007-10-16 23:30:53 -0700 | [diff] [blame] | 686 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 687 | static void raid0_status(struct seq_file *seq, struct mddev *mddev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | { |
Andre Noll | 9d8f036 | 2009-06-18 08:45:01 +1000 | [diff] [blame] | 689 | seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | return; |
| 691 | } |
| 692 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 693 | static void *raid0_takeover_raid45(struct mddev *mddev) |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 694 | { |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 695 | struct md_rdev *rdev; |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 696 | struct r0conf *priv_conf; |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 697 | |
| 698 | if (mddev->degraded != 1) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 699 | pr_warn("md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n", |
| 700 | mdname(mddev), |
| 701 | mddev->degraded); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 702 | return ERR_PTR(-EINVAL); |
| 703 | } |
| 704 | |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 705 | rdev_for_each(rdev, mddev) { |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 706 | /* check slot number for a disk */ |
| 707 | if (rdev->raid_disk == mddev->raid_disks-1) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 708 | pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n", |
| 709 | mdname(mddev)); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 710 | return ERR_PTR(-EINVAL); |
| 711 | } |
NeilBrown | eea136d | 2013-06-26 11:55:20 +1000 | [diff] [blame] | 712 | rdev->sectors = mddev->dev_sectors; |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 713 | } |
| 714 | |
| 715 | /* Set new parameters */ |
| 716 | mddev->new_level = 0; |
Maciej Trela | 001048a | 2010-06-16 11:55:14 +0100 | [diff] [blame] | 717 | mddev->new_layout = 0; |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 718 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
| 719 | mddev->raid_disks--; |
| 720 | mddev->delta_disks = -1; |
| 721 | /* make sure it will be not marked as dirty */ |
| 722 | mddev->recovery_cp = MaxSector; |
Shaohua Li | 394ed8e | 2017-01-04 16:10:19 -0800 | [diff] [blame] | 723 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 724 | |
| 725 | create_strip_zones(mddev, &priv_conf); |
Shaohua Li | 6995f0b | 2016-12-08 15:48:17 -0800 | [diff] [blame] | 726 | |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 727 | return priv_conf; |
| 728 | } |
| 729 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 730 | static void *raid0_takeover_raid10(struct mddev *mddev) |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 731 | { |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 732 | struct r0conf *priv_conf; |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 733 | |
| 734 | /* Check layout: |
| 735 | * - far_copies must be 1 |
| 736 | * - near_copies must be 2 |
| 737 | * - disks number must be even |
| 738 | * - all mirrors must be already degraded |
| 739 | */ |
| 740 | if (mddev->layout != ((1 << 8) + 2)) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 741 | pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n", |
| 742 | mdname(mddev), |
| 743 | mddev->layout); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 744 | return ERR_PTR(-EINVAL); |
| 745 | } |
| 746 | if (mddev->raid_disks & 1) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 747 | pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n", |
| 748 | mdname(mddev)); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 749 | return ERR_PTR(-EINVAL); |
| 750 | } |
| 751 | if (mddev->degraded != (mddev->raid_disks>>1)) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 752 | pr_warn("md/raid0:%s: All mirrors must be already degraded!\n", |
| 753 | mdname(mddev)); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 754 | return ERR_PTR(-EINVAL); |
| 755 | } |
| 756 | |
| 757 | /* Set new parameters */ |
| 758 | mddev->new_level = 0; |
Maciej Trela | 001048a | 2010-06-16 11:55:14 +0100 | [diff] [blame] | 759 | mddev->new_layout = 0; |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 760 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
| 761 | mddev->delta_disks = - mddev->raid_disks / 2; |
| 762 | mddev->raid_disks += mddev->delta_disks; |
| 763 | mddev->degraded = 0; |
| 764 | /* make sure it will be not marked as dirty */ |
| 765 | mddev->recovery_cp = MaxSector; |
Shaohua Li | 394ed8e | 2017-01-04 16:10:19 -0800 | [diff] [blame] | 766 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 767 | |
| 768 | create_strip_zones(mddev, &priv_conf); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 769 | return priv_conf; |
| 770 | } |
| 771 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 772 | static void *raid0_takeover_raid1(struct mddev *mddev) |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 773 | { |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 774 | struct r0conf *priv_conf; |
Jes Sorensen | 24b961f | 2012-04-01 23:48:38 +1000 | [diff] [blame] | 775 | int chunksect; |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 776 | |
| 777 | /* Check layout: |
| 778 | * - (N - 1) mirror drives must be already faulty |
| 779 | */ |
| 780 | if ((mddev->raid_disks - 1) != mddev->degraded) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 781 | pr_err("md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n", |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 782 | mdname(mddev)); |
| 783 | return ERR_PTR(-EINVAL); |
| 784 | } |
| 785 | |
Jes Sorensen | 24b961f | 2012-04-01 23:48:38 +1000 | [diff] [blame] | 786 | /* |
| 787 | * a raid1 doesn't have the notion of chunk size, so |
| 788 | * figure out the largest suitable size we can use. |
| 789 | */ |
| 790 | chunksect = 64 * 2; /* 64K by default */ |
| 791 | |
| 792 | /* The array must be an exact multiple of chunksize */ |
| 793 | while (chunksect && (mddev->array_sectors & (chunksect - 1))) |
| 794 | chunksect >>= 1; |
| 795 | |
| 796 | if ((chunksect << 9) < PAGE_SIZE) |
| 797 | /* array size does not allow a suitable chunk size */ |
| 798 | return ERR_PTR(-EINVAL); |
| 799 | |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 800 | /* Set new parameters */ |
| 801 | mddev->new_level = 0; |
| 802 | mddev->new_layout = 0; |
Jes Sorensen | 24b961f | 2012-04-01 23:48:38 +1000 | [diff] [blame] | 803 | mddev->new_chunk_sectors = chunksect; |
| 804 | mddev->chunk_sectors = chunksect; |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 805 | mddev->delta_disks = 1 - mddev->raid_disks; |
Krzysztof Wojcik | f7bee80 | 2011-02-14 10:01:41 +1100 | [diff] [blame] | 806 | mddev->raid_disks = 1; |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 807 | /* make sure it will be not marked as dirty */ |
| 808 | mddev->recovery_cp = MaxSector; |
Shaohua Li | 394ed8e | 2017-01-04 16:10:19 -0800 | [diff] [blame] | 809 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 810 | |
| 811 | create_strip_zones(mddev, &priv_conf); |
| 812 | return priv_conf; |
| 813 | } |
| 814 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 815 | static void *raid0_takeover(struct mddev *mddev) |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 816 | { |
| 817 | /* raid0 can take over: |
Maciej Trela | 049d6c1 | 2010-06-16 11:56:12 +0100 | [diff] [blame] | 818 | * raid4 - if all data disks are active. |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 819 | * raid5 - providing it is Raid4 layout and one disk is faulty |
| 820 | * raid10 - assuming we have all necessary active disks |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 821 | * raid1 - with (N -1) mirror drives faulty |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 822 | */ |
NeilBrown | a8461a6 | 2014-08-06 16:34:27 +1000 | [diff] [blame] | 823 | |
| 824 | if (mddev->bitmap) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 825 | pr_warn("md/raid0: %s: cannot takeover array with bitmap\n", |
| 826 | mdname(mddev)); |
NeilBrown | a8461a6 | 2014-08-06 16:34:27 +1000 | [diff] [blame] | 827 | return ERR_PTR(-EBUSY); |
| 828 | } |
Maciej Trela | 049d6c1 | 2010-06-16 11:56:12 +0100 | [diff] [blame] | 829 | if (mddev->level == 4) |
| 830 | return raid0_takeover_raid45(mddev); |
| 831 | |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 832 | if (mddev->level == 5) { |
| 833 | if (mddev->layout == ALGORITHM_PARITY_N) |
Maciej Trela | 049d6c1 | 2010-06-16 11:56:12 +0100 | [diff] [blame] | 834 | return raid0_takeover_raid45(mddev); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 835 | |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 836 | pr_warn("md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n", |
| 837 | mdname(mddev), ALGORITHM_PARITY_N); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 838 | } |
| 839 | |
| 840 | if (mddev->level == 10) |
| 841 | return raid0_takeover_raid10(mddev); |
| 842 | |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 843 | if (mddev->level == 1) |
| 844 | return raid0_takeover_raid1(mddev); |
| 845 | |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 846 | pr_warn("Takeover from raid%i to raid0 not supported\n", |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 847 | mddev->level); |
| 848 | |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 849 | return ERR_PTR(-EINVAL); |
| 850 | } |
| 851 | |
NeilBrown | 2fc45ef | 2017-10-19 12:49:15 +1100 | [diff] [blame] | 852 | static void raid0_quiesce(struct mddev *mddev, int quiesce) |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 853 | { |
| 854 | } |
| 855 | |
NeilBrown | 84fc4b5 | 2011-10-11 16:49:58 +1100 | [diff] [blame] | 856 | static struct md_personality raid0_personality= |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | { |
| 858 | .name = "raid0", |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 859 | .level = 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | .owner = THIS_MODULE, |
| 861 | .make_request = raid0_make_request, |
| 862 | .run = raid0_run, |
NeilBrown | afa0f55 | 2014-12-15 12:56:58 +1100 | [diff] [blame] | 863 | .free = raid0_free, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | .status = raid0_status, |
Dan Williams | 80c3a6c | 2009-03-17 18:10:40 -0700 | [diff] [blame] | 865 | .size = raid0_size, |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 866 | .takeover = raid0_takeover, |
| 867 | .quiesce = raid0_quiesce, |
NeilBrown | 5c675f8 | 2014-12-15 12:56:56 +1100 | [diff] [blame] | 868 | .congested = raid0_congested, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | }; |
| 870 | |
| 871 | static int __init raid0_init (void) |
| 872 | { |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 873 | return register_md_personality (&raid0_personality); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | } |
| 875 | |
| 876 | static void raid0_exit (void) |
| 877 | { |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 878 | unregister_md_personality (&raid0_personality); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | } |
| 880 | |
| 881 | module_init(raid0_init); |
| 882 | module_exit(raid0_exit); |
| 883 | MODULE_LICENSE("GPL"); |
NeilBrown | 0efb9e6 | 2009-12-14 12:49:58 +1100 | [diff] [blame] | 884 | MODULE_DESCRIPTION("RAID0 (striping) personality for MD"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | MODULE_ALIAS("md-personality-2"); /* RAID0 */ |
NeilBrown | d9d166c | 2006-01-06 00:20:51 -0800 | [diff] [blame] | 886 | MODULE_ALIAS("md-raid0"); |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 887 | MODULE_ALIAS("md-level-0"); |