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 | |
Shaohua Li | 394ed8e | 2017-01-04 16:10:19 -0800 | [diff] [blame] | 29 | #define UNSUPPORTED_MDDEV_FLAGS \ |
| 30 | ((1L << MD_HAS_JOURNAL) | \ |
| 31 | (1L << MD_JOURNAL_CLEAN) | \ |
Artur Paszkiewicz | ea0213e | 2017-03-09 09:59:57 +0100 | [diff] [blame] | 32 | (1L << MD_FAILFAST_SUPPORTED) |\ |
| 33 | (1L << MD_HAS_PPL)) |
Shaohua Li | 394ed8e | 2017-01-04 16:10:19 -0800 | [diff] [blame] | 34 | |
NeilBrown | 5c675f8 | 2014-12-15 12:56:56 +1100 | [diff] [blame] | 35 | static int raid0_congested(struct mddev *mddev, int bits) |
NeilBrown | 26be34d | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 36 | { |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 37 | struct r0conf *conf = mddev->private; |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 38 | struct md_rdev **devlist = conf->devlist; |
NeilBrown | 84707f3 | 2010-03-16 17:23:35 +1100 | [diff] [blame] | 39 | int raid_disks = conf->strip_zone[0].nb_dev; |
NeilBrown | 26be34d | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 40 | int i, ret = 0; |
| 41 | |
NeilBrown | 84707f3 | 2010-03-16 17:23:35 +1100 | [diff] [blame] | 42 | for (i = 0; i < raid_disks && !ret ; i++) { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 43 | struct request_queue *q = bdev_get_queue(devlist[i]->bdev); |
NeilBrown | 26be34d | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 44 | |
Jan Kara | dc3b17c | 2017-02-02 15:56:50 +0100 | [diff] [blame] | 45 | ret |= bdi_congested(q->backing_dev_info, bits); |
NeilBrown | 26be34d | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 46 | } |
| 47 | return ret; |
| 48 | } |
| 49 | |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 50 | /* |
| 51 | * inform the user of the raid configuration |
| 52 | */ |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 53 | static void dump_zones(struct mddev *mddev) |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 54 | { |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 55 | int j, k; |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 56 | sector_t zone_size = 0; |
| 57 | sector_t zone_start = 0; |
| 58 | char b[BDEVNAME_SIZE]; |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 59 | struct r0conf *conf = mddev->private; |
NeilBrown | 84707f3 | 2010-03-16 17:23:35 +1100 | [diff] [blame] | 60 | int raid_disks = conf->strip_zone[0].nb_dev; |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 61 | pr_debug("md: RAID0 configuration for %s - %d zone%s\n", |
| 62 | mdname(mddev), |
| 63 | conf->nr_strip_zones, conf->nr_strip_zones==1?"":"s"); |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 64 | for (j = 0; j < conf->nr_strip_zones; j++) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 65 | char line[200]; |
| 66 | int len = 0; |
| 67 | |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 68 | for (k = 0; k < conf->strip_zone[j].nb_dev; k++) |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 69 | len += snprintf(line+len, 200-len, "%s%s", k?"/":"", |
| 70 | bdevname(conf->devlist[j*raid_disks |
| 71 | + k]->bdev, b)); |
| 72 | pr_debug("md: zone%d=[%s]\n", j, line); |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 73 | |
| 74 | zone_size = conf->strip_zone[j].zone_end - zone_start; |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 75 | pr_debug(" zone-offset=%10lluKB, device-offset=%10lluKB, size=%10lluKB\n", |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 76 | (unsigned long long)zone_start>>1, |
| 77 | (unsigned long long)conf->strip_zone[j].dev_start>>1, |
| 78 | (unsigned long long)zone_size>>1); |
| 79 | zone_start = conf->strip_zone[j].zone_end; |
| 80 | } |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 81 | } |
| 82 | |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 83 | static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | { |
NeilBrown | a9f326e | 2009-09-23 18:06:41 +1000 | [diff] [blame] | 85 | int i, c, err; |
NeilBrown | 49f357a2 | 2009-06-16 16:50:35 +1000 | [diff] [blame] | 86 | sector_t curr_zone_end, sectors; |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 87 | struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | struct strip_zone *zone; |
| 89 | int cnt; |
| 90 | char b[BDEVNAME_SIZE]; |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 91 | char b2[BDEVNAME_SIZE]; |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 92 | struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL); |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 93 | unsigned short blksize = 512; |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 94 | |
Dan Carpenter | 7dedd15 | 2016-04-14 12:31:49 +0300 | [diff] [blame] | 95 | *private_conf = ERR_PTR(-ENOMEM); |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 96 | if (!conf) |
| 97 | return -ENOMEM; |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 98 | rdev_for_each(rdev1, mddev) { |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 99 | pr_debug("md/raid0:%s: looking at %s\n", |
| 100 | mdname(mddev), |
| 101 | bdevname(rdev1->bdev, b)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | c = 0; |
NeilBrown | 13f2682 | 2009-06-18 08:48:55 +1000 | [diff] [blame] | 103 | |
| 104 | /* round size to chunk_size */ |
| 105 | sectors = rdev1->sectors; |
| 106 | sector_div(sectors, mddev->chunk_sectors); |
| 107 | rdev1->sectors = sectors * mddev->chunk_sectors; |
| 108 | |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 109 | blksize = max(blksize, queue_logical_block_size( |
| 110 | rdev1->bdev->bd_disk->queue)); |
| 111 | |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 112 | rdev_for_each(rdev2, mddev) { |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 113 | pr_debug("md/raid0:%s: comparing %s(%llu)" |
| 114 | " with %s(%llu)\n", |
| 115 | mdname(mddev), |
| 116 | bdevname(rdev1->bdev,b), |
| 117 | (unsigned long long)rdev1->sectors, |
| 118 | bdevname(rdev2->bdev,b2), |
| 119 | (unsigned long long)rdev2->sectors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | if (rdev2 == rdev1) { |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 121 | pr_debug("md/raid0:%s: END\n", |
| 122 | mdname(mddev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | break; |
| 124 | } |
Andre Noll | dd8ac33 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 125 | if (rdev2->sectors == rdev1->sectors) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | /* |
| 127 | * Not unique, don't count it as a new |
| 128 | * group |
| 129 | */ |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 130 | pr_debug("md/raid0:%s: EQUAL\n", |
| 131 | mdname(mddev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | c = 1; |
| 133 | break; |
| 134 | } |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 135 | pr_debug("md/raid0:%s: NOT EQUAL\n", |
| 136 | mdname(mddev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | } |
| 138 | if (!c) { |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 139 | pr_debug("md/raid0:%s: ==> UNIQUE\n", |
| 140 | mdname(mddev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | conf->nr_strip_zones++; |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 142 | pr_debug("md/raid0:%s: %d zones\n", |
| 143 | mdname(mddev), conf->nr_strip_zones); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | } |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 146 | pr_debug("md/raid0:%s: FINAL %d zones\n", |
| 147 | mdname(mddev), conf->nr_strip_zones); |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 148 | /* |
| 149 | * now since we have the hard sector sizes, we can make sure |
| 150 | * chunk size is a multiple of that sector size |
| 151 | */ |
| 152 | if ((mddev->chunk_sectors << 9) % blksize) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 153 | pr_warn("md/raid0:%s: chunk_size of %d not multiple of block size %d\n", |
| 154 | mdname(mddev), |
| 155 | mddev->chunk_sectors << 9, blksize); |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 156 | err = -EINVAL; |
| 157 | goto abort; |
| 158 | } |
| 159 | |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 160 | err = -ENOMEM; |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 161 | conf->strip_zone = kzalloc(sizeof(struct strip_zone)* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | conf->nr_strip_zones, GFP_KERNEL); |
| 163 | if (!conf->strip_zone) |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 164 | goto abort; |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 165 | conf->devlist = kzalloc(sizeof(struct md_rdev*)* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | conf->nr_strip_zones*mddev->raid_disks, |
| 167 | GFP_KERNEL); |
| 168 | if (!conf->devlist) |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 169 | goto abort; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | /* The first zone must contain all devices, so here we check that |
| 172 | * there is a proper alignment of slots to devices and find them all |
| 173 | */ |
| 174 | zone = &conf->strip_zone[0]; |
| 175 | cnt = 0; |
| 176 | smallest = NULL; |
NeilBrown | b414579 | 2009-06-16 16:50:52 +1000 | [diff] [blame] | 177 | dev = conf->devlist; |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 178 | err = -EINVAL; |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 179 | rdev_for_each(rdev1, mddev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | int j = rdev1->raid_disk; |
| 181 | |
NeilBrown | e93f68a | 2010-06-15 09:36:03 +0100 | [diff] [blame] | 182 | if (mddev->level == 10) { |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 183 | /* taking over a raid10-n2 array */ |
| 184 | j /= 2; |
NeilBrown | e93f68a | 2010-06-15 09:36:03 +0100 | [diff] [blame] | 185 | rdev1->new_raid_disk = j; |
| 186 | } |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 187 | |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 188 | if (mddev->level == 1) { |
| 189 | /* taiking over a raid1 array- |
| 190 | * we have only one active disk |
| 191 | */ |
| 192 | j = 0; |
| 193 | rdev1->new_raid_disk = j; |
| 194 | } |
| 195 | |
NeilBrown | f96c9f3 | 2013-02-21 15:50:07 +1100 | [diff] [blame] | 196 | if (j < 0) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 197 | pr_warn("md/raid0:%s: remove inactive devices before converting to RAID0\n", |
| 198 | mdname(mddev)); |
NeilBrown | f96c9f3 | 2013-02-21 15:50:07 +1100 | [diff] [blame] | 199 | goto abort; |
| 200 | } |
| 201 | if (j >= mddev->raid_disks) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 202 | pr_warn("md/raid0:%s: bad disk number %d - aborting!\n", |
| 203 | mdname(mddev), j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | goto abort; |
| 205 | } |
NeilBrown | b414579 | 2009-06-16 16:50:52 +1000 | [diff] [blame] | 206 | if (dev[j]) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 207 | pr_warn("md/raid0:%s: multiple devices for %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 | dev[j] = rdev1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Andre Noll | dd8ac33 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 213 | if (!smallest || (rdev1->sectors < smallest->sectors)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | smallest = rdev1; |
| 215 | cnt++; |
| 216 | } |
| 217 | if (cnt != mddev->raid_disks) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 218 | pr_warn("md/raid0:%s: too few disks (%d of %d) - aborting!\n", |
| 219 | mdname(mddev), cnt, mddev->raid_disks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | goto abort; |
| 221 | } |
| 222 | zone->nb_dev = cnt; |
NeilBrown | 49f357a2 | 2009-06-16 16:50:35 +1000 | [diff] [blame] | 223 | zone->zone_end = smallest->sectors * cnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
NeilBrown | 49f357a2 | 2009-06-16 16:50:35 +1000 | [diff] [blame] | 225 | curr_zone_end = zone->zone_end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
| 227 | /* now do the other zones */ |
| 228 | for (i = 1; i < conf->nr_strip_zones; i++) |
| 229 | { |
NeilBrown | a9f326e | 2009-09-23 18:06:41 +1000 | [diff] [blame] | 230 | int j; |
| 231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | zone = conf->strip_zone + i; |
NeilBrown | b414579 | 2009-06-16 16:50:52 +1000 | [diff] [blame] | 233 | dev = conf->devlist + i * mddev->raid_disks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 235 | pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i); |
NeilBrown | d27a43ab | 2009-06-16 16:46:46 +1000 | [diff] [blame] | 236 | zone->dev_start = smallest->sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | smallest = NULL; |
| 238 | c = 0; |
| 239 | |
| 240 | for (j=0; j<cnt; j++) { |
NeilBrown | b414579 | 2009-06-16 16:50:52 +1000 | [diff] [blame] | 241 | rdev = conf->devlist[j]; |
NeilBrown | d27a43ab | 2009-06-16 16:46:46 +1000 | [diff] [blame] | 242 | if (rdev->sectors <= zone->dev_start) { |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 243 | pr_debug("md/raid0:%s: checking %s ... nope\n", |
| 244 | mdname(mddev), |
| 245 | bdevname(rdev->bdev, b)); |
Andre Noll | dd8ac33 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 246 | continue; |
| 247 | } |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 248 | pr_debug("md/raid0:%s: checking %s ..." |
| 249 | " contained as device %d\n", |
| 250 | mdname(mddev), |
| 251 | bdevname(rdev->bdev, b), c); |
NeilBrown | b414579 | 2009-06-16 16:50:52 +1000 | [diff] [blame] | 252 | dev[c] = rdev; |
Andre Noll | dd8ac33 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 253 | c++; |
| 254 | if (!smallest || rdev->sectors < smallest->sectors) { |
| 255 | smallest = rdev; |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 256 | pr_debug("md/raid0:%s: (%llu) is smallest!.\n", |
| 257 | mdname(mddev), |
| 258 | (unsigned long long)rdev->sectors); |
Andre Noll | dd8ac33 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 259 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } |
| 261 | |
| 262 | zone->nb_dev = c; |
NeilBrown | 49f357a2 | 2009-06-16 16:50:35 +1000 | [diff] [blame] | 263 | sectors = (smallest->sectors - zone->dev_start) * c; |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 264 | pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n", |
| 265 | mdname(mddev), |
| 266 | zone->nb_dev, (unsigned long long)sectors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
NeilBrown | 49f357a2 | 2009-06-16 16:50:35 +1000 | [diff] [blame] | 268 | curr_zone_end += sectors; |
NeilBrown | d27a43ab | 2009-06-16 16:46:46 +1000 | [diff] [blame] | 269 | zone->zone_end = curr_zone_end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | |
NeilBrown | 50de8df | 2011-10-07 14:23:22 +1100 | [diff] [blame] | 271 | pr_debug("md/raid0:%s: current zone start: %llu\n", |
| 272 | mdname(mddev), |
| 273 | (unsigned long long)smallest->sectors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | } |
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: done.\n", mdname(mddev)); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 277 | *private_conf = conf; |
| 278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | return 0; |
Andre Noll | 5568a60 | 2009-06-16 16:47:21 +1000 | [diff] [blame] | 280 | abort: |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 281 | kfree(conf->strip_zone); |
| 282 | kfree(conf->devlist); |
| 283 | kfree(conf); |
NeilBrown | 58ebb34 | 2013-02-21 15:36:38 +1100 | [diff] [blame] | 284 | *private_conf = ERR_PTR(err); |
Andre Noll | ed7b003 | 2009-06-16 16:47:36 +1000 | [diff] [blame] | 285 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | } |
| 287 | |
NeilBrown | ba13da4 | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 288 | /* Find the zone which holds a particular offset |
| 289 | * Update *sectorp to be an offset in that zone |
| 290 | */ |
| 291 | static struct strip_zone *find_zone(struct r0conf *conf, |
| 292 | sector_t *sectorp) |
| 293 | { |
| 294 | int i; |
| 295 | struct strip_zone *z = conf->strip_zone; |
| 296 | sector_t sector = *sectorp; |
| 297 | |
| 298 | for (i = 0; i < conf->nr_strip_zones; i++) |
| 299 | if (sector < z[i].zone_end) { |
| 300 | if (i) |
| 301 | *sectorp = sector - z[i-1].zone_end; |
| 302 | return z + i; |
| 303 | } |
| 304 | BUG(); |
| 305 | } |
| 306 | |
| 307 | /* |
| 308 | * remaps the bio to the target device. we separate two flows. |
NeilBrown | 47d6897 | 2015-04-10 13:19:04 +1000 | [diff] [blame] | 309 | * power 2 flow and a general flow for the sake of performance |
NeilBrown | ba13da4 | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 310 | */ |
| 311 | static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone, |
| 312 | sector_t sector, sector_t *sector_offset) |
| 313 | { |
| 314 | unsigned int sect_in_chunk; |
| 315 | sector_t chunk; |
| 316 | struct r0conf *conf = mddev->private; |
| 317 | int raid_disks = conf->strip_zone[0].nb_dev; |
| 318 | unsigned int chunk_sects = mddev->chunk_sectors; |
| 319 | |
| 320 | if (is_power_of_2(chunk_sects)) { |
| 321 | int chunksect_bits = ffz(~chunk_sects); |
| 322 | /* find the sector offset inside the chunk */ |
| 323 | sect_in_chunk = sector & (chunk_sects - 1); |
| 324 | sector >>= chunksect_bits; |
| 325 | /* chunk in zone */ |
| 326 | chunk = *sector_offset; |
| 327 | /* quotient is the chunk in real device*/ |
| 328 | sector_div(chunk, zone->nb_dev << chunksect_bits); |
| 329 | } else{ |
| 330 | sect_in_chunk = sector_div(sector, chunk_sects); |
| 331 | chunk = *sector_offset; |
| 332 | sector_div(chunk, chunk_sects * zone->nb_dev); |
| 333 | } |
| 334 | /* |
| 335 | * position the bio over the real device |
| 336 | * real sector = chunk in device + starting of zone |
| 337 | * + the position in the chunk |
| 338 | */ |
| 339 | *sector_offset = (chunk * chunk_sects) + sect_in_chunk; |
| 340 | return conf->devlist[(zone - conf->strip_zone)*raid_disks |
| 341 | + sector_div(sector, zone->nb_dev)]; |
| 342 | } |
| 343 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 344 | 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] | 345 | { |
| 346 | sector_t array_sectors = 0; |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 347 | struct md_rdev *rdev; |
Dan Williams | 80c3a6c | 2009-03-17 18:10:40 -0700 | [diff] [blame] | 348 | |
| 349 | WARN_ONCE(sectors || raid_disks, |
| 350 | "%s does not support generic reshape\n", __func__); |
| 351 | |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 352 | rdev_for_each(rdev, mddev) |
NeilBrown | a646853 | 2013-02-21 14:33:17 +1100 | [diff] [blame] | 353 | array_sectors += (rdev->sectors & |
| 354 | ~(sector_t)(mddev->chunk_sectors-1)); |
Dan Williams | 80c3a6c | 2009-03-17 18:10:40 -0700 | [diff] [blame] | 355 | |
| 356 | return array_sectors; |
| 357 | } |
| 358 | |
NeilBrown | afa0f55 | 2014-12-15 12:56:58 +1100 | [diff] [blame] | 359 | static void raid0_free(struct mddev *mddev, void *priv); |
majianpeng | 0366ef8 | 2012-04-02 09:48:37 +1000 | [diff] [blame] | 360 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 361 | static int raid0_run(struct mddev *mddev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | { |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 363 | struct r0conf *conf; |
Andre Noll | 5568a60 | 2009-06-16 16:47:21 +1000 | [diff] [blame] | 364 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
Andre Noll | 9d8f036 | 2009-06-18 08:45:01 +1000 | [diff] [blame] | 366 | if (mddev->chunk_sectors == 0) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 367 | pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev)); |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 368 | return -EINVAL; |
| 369 | } |
Andre Noll | 0894cc3 | 2009-06-18 08:49:23 +1000 | [diff] [blame] | 370 | if (md_check_no_bitmap(mddev)) |
| 371 | return -EINVAL; |
Heinz Mauelshagen | 753f285 | 2015-02-13 19:48:01 +0100 | [diff] [blame] | 372 | |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 373 | /* if private is not null, we are here after takeover */ |
| 374 | if (mddev->private == NULL) { |
| 375 | ret = create_strip_zones(mddev, &conf); |
| 376 | if (ret < 0) |
| 377 | return ret; |
| 378 | mddev->private = conf; |
| 379 | } |
| 380 | conf = mddev->private; |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 381 | if (mddev->queue) { |
| 382 | struct md_rdev *rdev; |
| 383 | bool discard_supported = false; |
| 384 | |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 385 | blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors); |
| 386 | blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors); |
| 387 | blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors); |
| 388 | |
| 389 | blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9); |
| 390 | blk_queue_io_opt(mddev->queue, |
| 391 | (mddev->chunk_sectors << 9) * mddev->raid_disks); |
| 392 | |
NeilBrown | 66eefe5 | 2015-09-24 15:47:47 +1000 | [diff] [blame] | 393 | rdev_for_each(rdev, mddev) { |
| 394 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
| 395 | rdev->data_offset << 9); |
| 396 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
| 397 | discard_supported = true; |
| 398 | } |
NeilBrown | 199dc6e | 2015-08-03 13:11:47 +1000 | [diff] [blame] | 399 | if (!discard_supported) |
| 400 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); |
| 401 | else |
| 402 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); |
| 403 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
| 405 | /* calculate array device size */ |
Dan Williams | 1f40362 | 2009-03-31 14:59:03 +1100 | [diff] [blame] | 406 | md_set_array_sectors(mddev, raid0_size(mddev, 0, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 408 | pr_debug("md/raid0:%s: md_size is %llu sectors.\n", |
| 409 | mdname(mddev), |
| 410 | (unsigned long long)mddev->array_sectors); |
Heinz Mauelshagen | 753f285 | 2015-02-13 19:48:01 +0100 | [diff] [blame] | 411 | |
| 412 | if (mddev->queue) { |
| 413 | /* calculate the max read-ahead size. |
| 414 | * For read-ahead of large files to be effective, we need to |
| 415 | * readahead at least twice a whole stripe. i.e. number of devices |
| 416 | * multiplied by chunk size times 2. |
| 417 | * If an individual device has an ra_pages greater than the |
| 418 | * chunk size, then we will not drive that device as hard as it |
| 419 | * wants. We consider this a configuration error: a larger |
| 420 | * chunksize should be used in that case. |
| 421 | */ |
Andre Noll | 9d8f036 | 2009-06-18 08:45:01 +1000 | [diff] [blame] | 422 | int stripe = mddev->raid_disks * |
| 423 | (mddev->chunk_sectors << 9) / PAGE_SIZE; |
Jan Kara | dc3b17c | 2017-02-02 15:56:50 +0100 | [diff] [blame] | 424 | if (mddev->queue->backing_dev_info->ra_pages < 2* stripe) |
| 425 | mddev->queue->backing_dev_info->ra_pages = 2* stripe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | } |
| 427 | |
raz ben yehuda | 4699419 | 2009-06-16 17:00:54 +1000 | [diff] [blame] | 428 | dump_zones(mddev); |
majianpeng | 0366ef8 | 2012-04-02 09:48:37 +1000 | [diff] [blame] | 429 | |
| 430 | ret = md_integrity_register(mddev); |
majianpeng | 0366ef8 | 2012-04-02 09:48:37 +1000 | [diff] [blame] | 431 | |
| 432 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | } |
| 434 | |
NeilBrown | afa0f55 | 2014-12-15 12:56:58 +1100 | [diff] [blame] | 435 | static void raid0_free(struct mddev *mddev, void *priv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | { |
NeilBrown | afa0f55 | 2014-12-15 12:56:58 +1100 | [diff] [blame] | 437 | struct r0conf *conf = priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
Jesper Juhl | 990a8ba | 2005-06-21 17:17:30 -0700 | [diff] [blame] | 439 | kfree(conf->strip_zone); |
Andre Noll | fb5ab4b | 2009-06-16 16:48:19 +1000 | [diff] [blame] | 440 | kfree(conf->devlist); |
Jesper Juhl | 990a8ba | 2005-06-21 17:17:30 -0700 | [diff] [blame] | 441 | kfree(conf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
| 443 | |
raz ben yehuda | fbb704e | 2009-06-16 17:02:05 +1000 | [diff] [blame] | 444 | /* |
| 445 | * Is io distribute over 1 or more chunks ? |
| 446 | */ |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 447 | static inline int is_io_in_chunk_boundary(struct mddev *mddev, |
raz ben yehuda | fbb704e | 2009-06-16 17:02:05 +1000 | [diff] [blame] | 448 | unsigned int chunk_sects, struct bio *bio) |
| 449 | { |
NeilBrown | d6e412e | 2009-06-18 08:47:00 +1000 | [diff] [blame] | 450 | if (likely(is_power_of_2(chunk_sects))) { |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 451 | return chunk_sects >= |
| 452 | ((bio->bi_iter.bi_sector & (chunk_sects-1)) |
Kent Overstreet | aa8b57a | 2013-02-05 15:19:29 -0800 | [diff] [blame] | 453 | + bio_sectors(bio)); |
raz ben yehuda | fbb704e | 2009-06-16 17:02:05 +1000 | [diff] [blame] | 454 | } else{ |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 455 | sector_t sector = bio->bi_iter.bi_sector; |
raz ben yehuda | fbb704e | 2009-06-16 17:02:05 +1000 | [diff] [blame] | 456 | return chunk_sects >= (sector_div(sector, chunk_sects) |
Kent Overstreet | aa8b57a | 2013-02-05 15:19:29 -0800 | [diff] [blame] | 457 | + bio_sectors(bio)); |
raz ben yehuda | fbb704e | 2009-06-16 17:02:05 +1000 | [diff] [blame] | 458 | } |
| 459 | } |
| 460 | |
Linus Torvalds | b4fdcb0 | 2011-11-04 17:06:58 -0700 | [diff] [blame] | 461 | static void raid0_make_request(struct mddev *mddev, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | struct strip_zone *zone; |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 464 | struct md_rdev *tmp_dev; |
Kent Overstreet | 20d0189 | 2013-11-23 18:21:01 -0800 | [diff] [blame] | 465 | struct bio *split; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 467 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { |
Tejun Heo | e9c7469 | 2010-09-03 11:56:18 +0200 | [diff] [blame] | 468 | md_flush_request(mddev, bio); |
Christoph Hellwig | 5a7bbad | 2011-09-12 12:12:01 +0200 | [diff] [blame] | 469 | return; |
NeilBrown | e5dcdd8 | 2005-09-09 16:23:41 -0700 | [diff] [blame] | 470 | } |
| 471 | |
Kent Overstreet | 20d0189 | 2013-11-23 18:21:01 -0800 | [diff] [blame] | 472 | do { |
NeilBrown | 109e376 | 2016-11-18 13:22:04 +1100 | [diff] [blame] | 473 | sector_t bio_sector = bio->bi_iter.bi_sector; |
| 474 | sector_t sector = bio_sector; |
Kent Overstreet | 20d0189 | 2013-11-23 18:21:01 -0800 | [diff] [blame] | 475 | unsigned chunk_sects = mddev->chunk_sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | |
Kent Overstreet | 20d0189 | 2013-11-23 18:21:01 -0800 | [diff] [blame] | 477 | unsigned sectors = chunk_sects - |
| 478 | (likely(is_power_of_2(chunk_sects)) |
| 479 | ? (sector & (chunk_sects-1)) |
| 480 | : sector_div(sector, chunk_sects)); |
Christoph Hellwig | 5a7bbad | 2011-09-12 12:12:01 +0200 | [diff] [blame] | 481 | |
Eric Work | a811577 | 2015-05-18 23:26:23 -0700 | [diff] [blame] | 482 | /* Restore due to sector_div */ |
NeilBrown | 109e376 | 2016-11-18 13:22:04 +1100 | [diff] [blame] | 483 | sector = bio_sector; |
Eric Work | a811577 | 2015-05-18 23:26:23 -0700 | [diff] [blame] | 484 | |
Kent Overstreet | 20d0189 | 2013-11-23 18:21:01 -0800 | [diff] [blame] | 485 | if (sectors < bio_sectors(bio)) { |
| 486 | split = bio_split(bio, sectors, GFP_NOIO, fs_bio_set); |
| 487 | bio_chain(split, bio); |
| 488 | } else { |
| 489 | split = bio; |
| 490 | } |
Shaohua Li | c83057a | 2012-10-11 13:25:44 +1100 | [diff] [blame] | 491 | |
Kent Overstreet | 20d0189 | 2013-11-23 18:21:01 -0800 | [diff] [blame] | 492 | zone = find_zone(mddev->private, §or); |
| 493 | tmp_dev = map_sector(mddev, zone, sector, §or); |
| 494 | split->bi_bdev = tmp_dev->bdev; |
| 495 | split->bi_iter.bi_sector = sector + zone->dev_start + |
| 496 | tmp_dev->data_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
Mike Christie | 796a5cf | 2016-06-05 14:32:07 -0500 | [diff] [blame] | 498 | if (unlikely((bio_op(split) == REQ_OP_DISCARD) && |
Kent Overstreet | 20d0189 | 2013-11-23 18:21:01 -0800 | [diff] [blame] | 499 | !blk_queue_discard(bdev_get_queue(split->bi_bdev)))) { |
| 500 | /* Just ignore it */ |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 501 | bio_endio(split); |
NeilBrown | 109e376 | 2016-11-18 13:22:04 +1100 | [diff] [blame] | 502 | } else { |
| 503 | if (mddev->gendisk) |
| 504 | trace_block_bio_remap(bdev_get_queue(split->bi_bdev), |
| 505 | split, disk_devt(mddev->gendisk), |
| 506 | bio_sector); |
Shaohua Li | 2648381 | 2017-02-13 16:21:49 -0800 | [diff] [blame] | 507 | mddev_check_writesame(mddev, split); |
Kent Overstreet | 20d0189 | 2013-11-23 18:21:01 -0800 | [diff] [blame] | 508 | generic_make_request(split); |
NeilBrown | 109e376 | 2016-11-18 13:22:04 +1100 | [diff] [blame] | 509 | } |
Kent Overstreet | 20d0189 | 2013-11-23 18:21:01 -0800 | [diff] [blame] | 510 | } while (split != bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | } |
NeilBrown | 8299d7f | 2007-10-16 23:30:53 -0700 | [diff] [blame] | 512 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 513 | static void raid0_status(struct seq_file *seq, struct mddev *mddev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | { |
Andre Noll | 9d8f036 | 2009-06-18 08:45:01 +1000 | [diff] [blame] | 515 | seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | return; |
| 517 | } |
| 518 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 519 | static void *raid0_takeover_raid45(struct mddev *mddev) |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 520 | { |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 521 | struct md_rdev *rdev; |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 522 | struct r0conf *priv_conf; |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 523 | |
| 524 | if (mddev->degraded != 1) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 525 | pr_warn("md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n", |
| 526 | mdname(mddev), |
| 527 | mddev->degraded); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 528 | return ERR_PTR(-EINVAL); |
| 529 | } |
| 530 | |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 531 | rdev_for_each(rdev, mddev) { |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 532 | /* check slot number for a disk */ |
| 533 | if (rdev->raid_disk == mddev->raid_disks-1) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 534 | pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n", |
| 535 | mdname(mddev)); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 536 | return ERR_PTR(-EINVAL); |
| 537 | } |
NeilBrown | eea136d | 2013-06-26 11:55:20 +1000 | [diff] [blame] | 538 | rdev->sectors = mddev->dev_sectors; |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 539 | } |
| 540 | |
| 541 | /* Set new parameters */ |
| 542 | mddev->new_level = 0; |
Maciej Trela | 001048a | 2010-06-16 11:55:14 +0100 | [diff] [blame] | 543 | mddev->new_layout = 0; |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 544 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
| 545 | mddev->raid_disks--; |
| 546 | mddev->delta_disks = -1; |
| 547 | /* make sure it will be not marked as dirty */ |
| 548 | mddev->recovery_cp = MaxSector; |
Shaohua Li | 394ed8e | 2017-01-04 16:10:19 -0800 | [diff] [blame] | 549 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 550 | |
| 551 | create_strip_zones(mddev, &priv_conf); |
Shaohua Li | 6995f0b | 2016-12-08 15:48:17 -0800 | [diff] [blame] | 552 | |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 553 | return priv_conf; |
| 554 | } |
| 555 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 556 | static void *raid0_takeover_raid10(struct mddev *mddev) |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 557 | { |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 558 | struct r0conf *priv_conf; |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 559 | |
| 560 | /* Check layout: |
| 561 | * - far_copies must be 1 |
| 562 | * - near_copies must be 2 |
| 563 | * - disks number must be even |
| 564 | * - all mirrors must be already degraded |
| 565 | */ |
| 566 | if (mddev->layout != ((1 << 8) + 2)) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 567 | pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n", |
| 568 | mdname(mddev), |
| 569 | mddev->layout); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 570 | return ERR_PTR(-EINVAL); |
| 571 | } |
| 572 | if (mddev->raid_disks & 1) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 573 | pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n", |
| 574 | mdname(mddev)); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 575 | return ERR_PTR(-EINVAL); |
| 576 | } |
| 577 | if (mddev->degraded != (mddev->raid_disks>>1)) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 578 | pr_warn("md/raid0:%s: All mirrors must be already degraded!\n", |
| 579 | mdname(mddev)); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 580 | return ERR_PTR(-EINVAL); |
| 581 | } |
| 582 | |
| 583 | /* Set new parameters */ |
| 584 | mddev->new_level = 0; |
Maciej Trela | 001048a | 2010-06-16 11:55:14 +0100 | [diff] [blame] | 585 | mddev->new_layout = 0; |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 586 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
| 587 | mddev->delta_disks = - mddev->raid_disks / 2; |
| 588 | mddev->raid_disks += mddev->delta_disks; |
| 589 | mddev->degraded = 0; |
| 590 | /* make sure it will be not marked as dirty */ |
| 591 | mddev->recovery_cp = MaxSector; |
Shaohua Li | 394ed8e | 2017-01-04 16:10:19 -0800 | [diff] [blame] | 592 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 593 | |
| 594 | create_strip_zones(mddev, &priv_conf); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 595 | return priv_conf; |
| 596 | } |
| 597 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 598 | static void *raid0_takeover_raid1(struct mddev *mddev) |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 599 | { |
NeilBrown | e373ab1 | 2011-10-11 16:48:59 +1100 | [diff] [blame] | 600 | struct r0conf *priv_conf; |
Jes Sorensen | 24b961f | 2012-04-01 23:48:38 +1000 | [diff] [blame] | 601 | int chunksect; |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 602 | |
| 603 | /* Check layout: |
| 604 | * - (N - 1) mirror drives must be already faulty |
| 605 | */ |
| 606 | if ((mddev->raid_disks - 1) != mddev->degraded) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 607 | 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] | 608 | mdname(mddev)); |
| 609 | return ERR_PTR(-EINVAL); |
| 610 | } |
| 611 | |
Jes Sorensen | 24b961f | 2012-04-01 23:48:38 +1000 | [diff] [blame] | 612 | /* |
| 613 | * a raid1 doesn't have the notion of chunk size, so |
| 614 | * figure out the largest suitable size we can use. |
| 615 | */ |
| 616 | chunksect = 64 * 2; /* 64K by default */ |
| 617 | |
| 618 | /* The array must be an exact multiple of chunksize */ |
| 619 | while (chunksect && (mddev->array_sectors & (chunksect - 1))) |
| 620 | chunksect >>= 1; |
| 621 | |
| 622 | if ((chunksect << 9) < PAGE_SIZE) |
| 623 | /* array size does not allow a suitable chunk size */ |
| 624 | return ERR_PTR(-EINVAL); |
| 625 | |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 626 | /* Set new parameters */ |
| 627 | mddev->new_level = 0; |
| 628 | mddev->new_layout = 0; |
Jes Sorensen | 24b961f | 2012-04-01 23:48:38 +1000 | [diff] [blame] | 629 | mddev->new_chunk_sectors = chunksect; |
| 630 | mddev->chunk_sectors = chunksect; |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 631 | mddev->delta_disks = 1 - mddev->raid_disks; |
Krzysztof Wojcik | f7bee80 | 2011-02-14 10:01:41 +1100 | [diff] [blame] | 632 | mddev->raid_disks = 1; |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 633 | /* make sure it will be not marked as dirty */ |
| 634 | mddev->recovery_cp = MaxSector; |
Shaohua Li | 394ed8e | 2017-01-04 16:10:19 -0800 | [diff] [blame] | 635 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 636 | |
| 637 | create_strip_zones(mddev, &priv_conf); |
| 638 | return priv_conf; |
| 639 | } |
| 640 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 641 | static void *raid0_takeover(struct mddev *mddev) |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 642 | { |
| 643 | /* raid0 can take over: |
Maciej Trela | 049d6c1 | 2010-06-16 11:56:12 +0100 | [diff] [blame] | 644 | * raid4 - if all data disks are active. |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 645 | * raid5 - providing it is Raid4 layout and one disk is faulty |
| 646 | * raid10 - assuming we have all necessary active disks |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 647 | * raid1 - with (N -1) mirror drives faulty |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 648 | */ |
NeilBrown | a8461a6 | 2014-08-06 16:34:27 +1000 | [diff] [blame] | 649 | |
| 650 | if (mddev->bitmap) { |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 651 | pr_warn("md/raid0: %s: cannot takeover array with bitmap\n", |
| 652 | mdname(mddev)); |
NeilBrown | a8461a6 | 2014-08-06 16:34:27 +1000 | [diff] [blame] | 653 | return ERR_PTR(-EBUSY); |
| 654 | } |
Maciej Trela | 049d6c1 | 2010-06-16 11:56:12 +0100 | [diff] [blame] | 655 | if (mddev->level == 4) |
| 656 | return raid0_takeover_raid45(mddev); |
| 657 | |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 658 | if (mddev->level == 5) { |
| 659 | if (mddev->layout == ALGORITHM_PARITY_N) |
Maciej Trela | 049d6c1 | 2010-06-16 11:56:12 +0100 | [diff] [blame] | 660 | return raid0_takeover_raid45(mddev); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 661 | |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 662 | pr_warn("md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n", |
| 663 | mdname(mddev), ALGORITHM_PARITY_N); |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 664 | } |
| 665 | |
| 666 | if (mddev->level == 10) |
| 667 | return raid0_takeover_raid10(mddev); |
| 668 | |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 669 | if (mddev->level == 1) |
| 670 | return raid0_takeover_raid1(mddev); |
| 671 | |
NeilBrown | 7660388 | 2016-11-02 14:16:50 +1100 | [diff] [blame] | 672 | pr_warn("Takeover from raid%i to raid0 not supported\n", |
Krzysztof Wojcik | fc3a08b | 2011-01-31 13:47:13 +1100 | [diff] [blame] | 673 | mddev->level); |
| 674 | |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 675 | return ERR_PTR(-EINVAL); |
| 676 | } |
| 677 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 678 | static void raid0_quiesce(struct mddev *mddev, int state) |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 679 | { |
| 680 | } |
| 681 | |
NeilBrown | 84fc4b5 | 2011-10-11 16:49:58 +1100 | [diff] [blame] | 682 | static struct md_personality raid0_personality= |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | { |
| 684 | .name = "raid0", |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 685 | .level = 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | .owner = THIS_MODULE, |
| 687 | .make_request = raid0_make_request, |
| 688 | .run = raid0_run, |
NeilBrown | afa0f55 | 2014-12-15 12:56:58 +1100 | [diff] [blame] | 689 | .free = raid0_free, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | .status = raid0_status, |
Dan Williams | 80c3a6c | 2009-03-17 18:10:40 -0700 | [diff] [blame] | 691 | .size = raid0_size, |
Trela, Maciej | 9af204c | 2010-03-08 16:02:44 +1100 | [diff] [blame] | 692 | .takeover = raid0_takeover, |
| 693 | .quiesce = raid0_quiesce, |
NeilBrown | 5c675f8 | 2014-12-15 12:56:56 +1100 | [diff] [blame] | 694 | .congested = raid0_congested, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | }; |
| 696 | |
| 697 | static int __init raid0_init (void) |
| 698 | { |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 699 | return register_md_personality (&raid0_personality); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | } |
| 701 | |
| 702 | static void raid0_exit (void) |
| 703 | { |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 704 | unregister_md_personality (&raid0_personality); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | } |
| 706 | |
| 707 | module_init(raid0_init); |
| 708 | module_exit(raid0_exit); |
| 709 | MODULE_LICENSE("GPL"); |
NeilBrown | 0efb9e6 | 2009-12-14 12:49:58 +1100 | [diff] [blame] | 710 | MODULE_DESCRIPTION("RAID0 (striping) personality for MD"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | MODULE_ALIAS("md-personality-2"); /* RAID0 */ |
NeilBrown | d9d166c | 2006-01-06 00:20:51 -0800 | [diff] [blame] | 712 | MODULE_ALIAS("md-raid0"); |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 713 | MODULE_ALIAS("md-level-0"); |