Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * raid1.c : Multiple Devices driver for Linux |
| 3 | * |
| 4 | * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat |
| 5 | * |
| 6 | * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman |
| 7 | * |
| 8 | * RAID-1 management functions. |
| 9 | * |
| 10 | * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 |
| 11 | * |
Jan Engelhardt | 96de0e2 | 2007-10-19 23:21:04 +0200 | [diff] [blame] | 12 | * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> |
| 14 | * |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 15 | * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support |
| 16 | * bitmapped intelligence in resync: |
| 17 | * |
| 18 | * - bitmap marked during normal i/o |
| 19 | * - bitmap used to skip nondirty blocks during sync |
| 20 | * |
| 21 | * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: |
| 22 | * - persistent bitmap code |
| 23 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | * This program is free software; you can redistribute it and/or modify |
| 25 | * it under the terms of the GNU General Public License as published by |
| 26 | * the Free Software Foundation; either version 2, or (at your option) |
| 27 | * any later version. |
| 28 | * |
| 29 | * You should have received a copy of the GNU General Public License |
| 30 | * (for example /usr/src/linux/COPYING); if not, write to the Free |
| 31 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 32 | */ |
| 33 | |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 34 | #include "dm-bio-list.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/raid/raid1.h> |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 36 | #include <linux/raid/bitmap.h> |
| 37 | |
| 38 | #define DEBUG 0 |
| 39 | #if DEBUG |
| 40 | #define PRINTK(x...) printk(x) |
| 41 | #else |
| 42 | #define PRINTK(x...) |
| 43 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | /* |
| 46 | * Number of guaranteed r1bios in case of extreme VM load: |
| 47 | */ |
| 48 | #define NR_RAID1_BIOS 256 |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | static void unplug_slaves(mddev_t *mddev); |
| 52 | |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 53 | static void allow_barrier(conf_t *conf); |
| 54 | static void lower_barrier(conf_t *conf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 56 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | { |
| 58 | struct pool_info *pi = data; |
| 59 | r1bio_t *r1_bio; |
| 60 | int size = offsetof(r1bio_t, bios[pi->raid_disks]); |
| 61 | |
| 62 | /* allocate a r1bio with room for raid_disks entries in the bios array */ |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 63 | r1_bio = kzalloc(size, gfp_flags); |
| 64 | if (!r1_bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | unplug_slaves(pi->mddev); |
| 66 | |
| 67 | return r1_bio; |
| 68 | } |
| 69 | |
| 70 | static void r1bio_pool_free(void *r1_bio, void *data) |
| 71 | { |
| 72 | kfree(r1_bio); |
| 73 | } |
| 74 | |
| 75 | #define RESYNC_BLOCK_SIZE (64*1024) |
| 76 | //#define RESYNC_BLOCK_SIZE PAGE_SIZE |
| 77 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) |
| 78 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) |
| 79 | #define RESYNC_WINDOW (2048*1024) |
| 80 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 81 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | { |
| 83 | struct pool_info *pi = data; |
| 84 | struct page *page; |
| 85 | r1bio_t *r1_bio; |
| 86 | struct bio *bio; |
| 87 | int i, j; |
| 88 | |
| 89 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); |
| 90 | if (!r1_bio) { |
| 91 | unplug_slaves(pi->mddev); |
| 92 | return NULL; |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * Allocate bios : 1 for reading, n-1 for writing |
| 97 | */ |
| 98 | for (j = pi->raid_disks ; j-- ; ) { |
| 99 | bio = bio_alloc(gfp_flags, RESYNC_PAGES); |
| 100 | if (!bio) |
| 101 | goto out_free_bio; |
| 102 | r1_bio->bios[j] = bio; |
| 103 | } |
| 104 | /* |
| 105 | * Allocate RESYNC_PAGES data pages and attach them to |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 106 | * the first bio. |
| 107 | * If this is a user-requested check/repair, allocate |
| 108 | * RESYNC_PAGES for each bio. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | */ |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 110 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
| 111 | j = pi->raid_disks; |
| 112 | else |
| 113 | j = 1; |
| 114 | while(j--) { |
| 115 | bio = r1_bio->bios[j]; |
| 116 | for (i = 0; i < RESYNC_PAGES; i++) { |
| 117 | page = alloc_page(gfp_flags); |
| 118 | if (unlikely(!page)) |
| 119 | goto out_free_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 121 | bio->bi_io_vec[i].bv_page = page; |
| 122 | } |
| 123 | } |
| 124 | /* If not user-requests, copy the page pointers to all bios */ |
| 125 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { |
| 126 | for (i=0; i<RESYNC_PAGES ; i++) |
| 127 | for (j=1; j<pi->raid_disks; j++) |
| 128 | r1_bio->bios[j]->bi_io_vec[i].bv_page = |
| 129 | r1_bio->bios[0]->bi_io_vec[i].bv_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | r1_bio->master_bio = NULL; |
| 133 | |
| 134 | return r1_bio; |
| 135 | |
| 136 | out_free_pages: |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 137 | for (i=0; i < RESYNC_PAGES ; i++) |
| 138 | for (j=0 ; j < pi->raid_disks; j++) |
NeilBrown | 1345b1d | 2006-01-06 00:20:40 -0800 | [diff] [blame] | 139 | safe_put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 140 | j = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | out_free_bio: |
| 142 | while ( ++j < pi->raid_disks ) |
| 143 | bio_put(r1_bio->bios[j]); |
| 144 | r1bio_pool_free(r1_bio, data); |
| 145 | return NULL; |
| 146 | } |
| 147 | |
| 148 | static void r1buf_pool_free(void *__r1_bio, void *data) |
| 149 | { |
| 150 | struct pool_info *pi = data; |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 151 | int i,j; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | r1bio_t *r1bio = __r1_bio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 154 | for (i = 0; i < RESYNC_PAGES; i++) |
| 155 | for (j = pi->raid_disks; j-- ;) { |
| 156 | if (j == 0 || |
| 157 | r1bio->bios[j]->bi_io_vec[i].bv_page != |
| 158 | r1bio->bios[0]->bi_io_vec[i].bv_page) |
NeilBrown | 1345b1d | 2006-01-06 00:20:40 -0800 | [diff] [blame] | 159 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 160 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | for (i=0 ; i < pi->raid_disks; i++) |
| 162 | bio_put(r1bio->bios[i]); |
| 163 | |
| 164 | r1bio_pool_free(r1bio, data); |
| 165 | } |
| 166 | |
| 167 | static void put_all_bios(conf_t *conf, r1bio_t *r1_bio) |
| 168 | { |
| 169 | int i; |
| 170 | |
| 171 | for (i = 0; i < conf->raid_disks; i++) { |
| 172 | struct bio **bio = r1_bio->bios + i; |
NeilBrown | cf30a47 | 2006-01-06 00:20:23 -0800 | [diff] [blame] | 173 | if (*bio && *bio != IO_BLOCKED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | bio_put(*bio); |
| 175 | *bio = NULL; |
| 176 | } |
| 177 | } |
| 178 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 179 | static void free_r1bio(r1bio_t *r1_bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | conf_t *conf = mddev_to_conf(r1_bio->mddev); |
| 182 | |
| 183 | /* |
| 184 | * Wake up any possible resync thread that waits for the device |
| 185 | * to go idle. |
| 186 | */ |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 187 | allow_barrier(conf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
| 189 | put_all_bios(conf, r1_bio); |
| 190 | mempool_free(r1_bio, conf->r1bio_pool); |
| 191 | } |
| 192 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 193 | static void put_buf(r1bio_t *r1_bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | { |
| 195 | conf_t *conf = mddev_to_conf(r1_bio->mddev); |
NeilBrown | 3e198f7 | 2006-01-06 00:20:21 -0800 | [diff] [blame] | 196 | int i; |
| 197 | |
| 198 | for (i=0; i<conf->raid_disks; i++) { |
| 199 | struct bio *bio = r1_bio->bios[i]; |
| 200 | if (bio->bi_end_io) |
| 201 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); |
| 202 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
| 204 | mempool_free(r1_bio, conf->r1buf_pool); |
| 205 | |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 206 | lower_barrier(conf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | static void reschedule_retry(r1bio_t *r1_bio) |
| 210 | { |
| 211 | unsigned long flags; |
| 212 | mddev_t *mddev = r1_bio->mddev; |
| 213 | conf_t *conf = mddev_to_conf(mddev); |
| 214 | |
| 215 | spin_lock_irqsave(&conf->device_lock, flags); |
| 216 | list_add(&r1_bio->retry_list, &conf->retry_list); |
NeilBrown | ddaf22a | 2006-01-06 00:20:19 -0800 | [diff] [blame] | 217 | conf->nr_queued ++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | spin_unlock_irqrestore(&conf->device_lock, flags); |
| 219 | |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 220 | wake_up(&conf->wait_barrier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | md_wakeup_thread(mddev->thread); |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | * raid_end_bio_io() is called when we have finished servicing a mirrored |
| 226 | * operation and are ready to return a success/failure code to the buffer |
| 227 | * cache layer. |
| 228 | */ |
| 229 | static void raid_end_bio_io(r1bio_t *r1_bio) |
| 230 | { |
| 231 | struct bio *bio = r1_bio->master_bio; |
| 232 | |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 233 | /* if nobody has done the final endio yet, do it now */ |
| 234 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { |
| 235 | PRINTK(KERN_DEBUG "raid1: sync end %s on sectors %llu-%llu\n", |
| 236 | (bio_data_dir(bio) == WRITE) ? "write" : "read", |
| 237 | (unsigned long long) bio->bi_sector, |
| 238 | (unsigned long long) bio->bi_sector + |
| 239 | (bio->bi_size >> 9) - 1); |
| 240 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 241 | bio_endio(bio, |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 242 | test_bit(R1BIO_Uptodate, &r1_bio->state) ? 0 : -EIO); |
| 243 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | free_r1bio(r1_bio); |
| 245 | } |
| 246 | |
| 247 | /* |
| 248 | * Update disk head position estimator based on IRQ completion info. |
| 249 | */ |
| 250 | static inline void update_head_pos(int disk, r1bio_t *r1_bio) |
| 251 | { |
| 252 | conf_t *conf = mddev_to_conf(r1_bio->mddev); |
| 253 | |
| 254 | conf->mirrors[disk].head_position = |
| 255 | r1_bio->sector + (r1_bio->sectors); |
| 256 | } |
| 257 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 258 | static void raid1_end_read_request(struct bio *bio, int error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | { |
| 260 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
| 261 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); |
| 262 | int mirror; |
| 263 | conf_t *conf = mddev_to_conf(r1_bio->mddev); |
| 264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | mirror = r1_bio->read_disk; |
| 266 | /* |
| 267 | * this branch is our 'one mirror IO has finished' event handler: |
| 268 | */ |
NeilBrown | ddaf22a | 2006-01-06 00:20:19 -0800 | [diff] [blame] | 269 | update_head_pos(mirror, r1_bio); |
| 270 | |
NeilBrown | dd00a99 | 2007-05-10 03:15:50 -0700 | [diff] [blame] | 271 | if (uptodate) |
| 272 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
| 273 | else { |
| 274 | /* If all other devices have failed, we want to return |
| 275 | * the error upwards rather than fail the last device. |
| 276 | * Here we redefine "uptodate" to mean "Don't want to retry" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | */ |
NeilBrown | dd00a99 | 2007-05-10 03:15:50 -0700 | [diff] [blame] | 278 | unsigned long flags; |
| 279 | spin_lock_irqsave(&conf->device_lock, flags); |
| 280 | if (r1_bio->mddev->degraded == conf->raid_disks || |
| 281 | (r1_bio->mddev->degraded == conf->raid_disks-1 && |
| 282 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) |
| 283 | uptodate = 1; |
| 284 | spin_unlock_irqrestore(&conf->device_lock, flags); |
| 285 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
NeilBrown | dd00a99 | 2007-05-10 03:15:50 -0700 | [diff] [blame] | 287 | if (uptodate) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | raid_end_bio_io(r1_bio); |
NeilBrown | dd00a99 | 2007-05-10 03:15:50 -0700 | [diff] [blame] | 289 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | /* |
| 291 | * oops, read error: |
| 292 | */ |
| 293 | char b[BDEVNAME_SIZE]; |
| 294 | if (printk_ratelimit()) |
| 295 | printk(KERN_ERR "raid1: %s: rescheduling sector %llu\n", |
| 296 | bdevname(conf->mirrors[mirror].rdev->bdev,b), (unsigned long long)r1_bio->sector); |
| 297 | reschedule_retry(r1_bio); |
| 298 | } |
| 299 | |
| 300 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | } |
| 302 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 303 | static void raid1_end_write_request(struct bio *bio, int error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | { |
| 305 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
| 306 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 307 | int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | conf_t *conf = mddev_to_conf(r1_bio->mddev); |
NeilBrown | 04b857f | 2006-03-09 17:33:46 -0800 | [diff] [blame] | 309 | struct bio *to_put = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
| 312 | for (mirror = 0; mirror < conf->raid_disks; mirror++) |
| 313 | if (r1_bio->bios[mirror] == bio) |
| 314 | break; |
| 315 | |
NeilBrown | bea2771 | 2006-05-01 12:15:46 -0700 | [diff] [blame] | 316 | if (error == -EOPNOTSUPP && test_bit(R1BIO_Barrier, &r1_bio->state)) { |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 317 | set_bit(BarriersNotsupp, &conf->mirrors[mirror].rdev->flags); |
| 318 | set_bit(R1BIO_BarrierRetry, &r1_bio->state); |
| 319 | r1_bio->mddev->barriers_work = 0; |
NeilBrown | 5e7dd2a | 2006-05-01 12:15:47 -0700 | [diff] [blame] | 320 | /* Don't rdev_dec_pending in this branch - keep it for the retry */ |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 321 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | /* |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 323 | * this branch is our 'one mirror IO has finished' event handler: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | */ |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 325 | r1_bio->bios[mirror] = NULL; |
NeilBrown | 04b857f | 2006-03-09 17:33:46 -0800 | [diff] [blame] | 326 | to_put = bio; |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 327 | if (!uptodate) { |
| 328 | md_error(r1_bio->mddev, conf->mirrors[mirror].rdev); |
| 329 | /* an I/O failed, we can't clear the bitmap */ |
| 330 | set_bit(R1BIO_Degraded, &r1_bio->state); |
| 331 | } else |
| 332 | /* |
| 333 | * Set R1BIO_Uptodate in our master bio, so that |
| 334 | * we will return a good error code for to the higher |
| 335 | * levels even if IO on some other mirrored buffer fails. |
| 336 | * |
| 337 | * The 'master' represents the composite IO operation to |
| 338 | * user-side. So if something waits for IO, then it will |
| 339 | * wait for the 'master' bio. |
| 340 | */ |
| 341 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 343 | update_head_pos(mirror, r1_bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 345 | if (behind) { |
| 346 | if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) |
| 347 | atomic_dec(&r1_bio->behind_remaining); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 348 | |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 349 | /* In behind mode, we ACK the master bio once the I/O has safely |
| 350 | * reached all non-writemostly disks. Setting the Returned bit |
| 351 | * ensures that this gets done only once -- we don't ever want to |
| 352 | * return -EIO here, instead we'll wait */ |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 353 | |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 354 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && |
| 355 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { |
| 356 | /* Maybe we can return now */ |
| 357 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { |
| 358 | struct bio *mbio = r1_bio->master_bio; |
| 359 | PRINTK(KERN_DEBUG "raid1: behind end write sectors %llu-%llu\n", |
| 360 | (unsigned long long) mbio->bi_sector, |
| 361 | (unsigned long long) mbio->bi_sector + |
| 362 | (mbio->bi_size >> 9) - 1); |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 363 | bio_endio(mbio, 0); |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 364 | } |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 365 | } |
| 366 | } |
NeilBrown | 5e7dd2a | 2006-05-01 12:15:47 -0700 | [diff] [blame] | 367 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 368 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | /* |
| 370 | * |
| 371 | * Let's see if all mirrored write operations have finished |
| 372 | * already. |
| 373 | */ |
| 374 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
NeilBrown | c70810b | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 375 | if (test_bit(R1BIO_BarrierRetry, &r1_bio->state)) |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 376 | reschedule_retry(r1_bio); |
NeilBrown | c70810b | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 377 | else { |
| 378 | /* it really is the end of this request */ |
| 379 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
| 380 | /* free extra copy of the data pages */ |
| 381 | int i = bio->bi_vcnt; |
| 382 | while (i--) |
| 383 | safe_put_page(bio->bi_io_vec[i].bv_page); |
| 384 | } |
| 385 | /* clear the bitmap if all writes complete successfully */ |
| 386 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, |
| 387 | r1_bio->sectors, |
| 388 | !test_bit(R1BIO_Degraded, &r1_bio->state), |
| 389 | behind); |
| 390 | md_write_end(r1_bio->mddev); |
| 391 | raid_end_bio_io(r1_bio); |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 392 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
NeilBrown | c70810b | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 394 | |
NeilBrown | 04b857f | 2006-03-09 17:33:46 -0800 | [diff] [blame] | 395 | if (to_put) |
| 396 | bio_put(to_put); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | |
| 400 | /* |
| 401 | * This routine returns the disk from which the requested read should |
| 402 | * be done. There is a per-array 'next expected sequential IO' sector |
| 403 | * number - if this matches on the next IO then we use the last disk. |
| 404 | * There is also a per-disk 'last know head position' sector that is |
| 405 | * maintained from IRQ contexts, both the normal and the resync IO |
| 406 | * completion handlers update this position correctly. If there is no |
| 407 | * perfect sequential match then we pick the disk whose head is closest. |
| 408 | * |
| 409 | * If there are 2 mirrors in the same 2 devices, performance degrades |
| 410 | * because position is mirror, not device based. |
| 411 | * |
| 412 | * The rdev for the device selected will have nr_pending incremented. |
| 413 | */ |
| 414 | static int read_balance(conf_t *conf, r1bio_t *r1_bio) |
| 415 | { |
| 416 | const unsigned long this_sector = r1_bio->sector; |
| 417 | int new_disk = conf->last_used, disk = new_disk; |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 418 | int wonly_disk = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | const int sectors = r1_bio->sectors; |
| 420 | sector_t new_distance, current_distance; |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 421 | mdk_rdev_t *rdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
| 423 | rcu_read_lock(); |
| 424 | /* |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 425 | * Check if we can balance. We can balance on the whole |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | * device if no resync is going on, or below the resync window. |
| 427 | * We take the first readable disk when above the resync window. |
| 428 | */ |
| 429 | retry: |
| 430 | if (conf->mddev->recovery_cp < MaxSector && |
| 431 | (this_sector + sectors >= conf->next_resync)) { |
| 432 | /* Choose the first operation device, for consistancy */ |
| 433 | new_disk = 0; |
| 434 | |
Suzanne Wood | d6065f7 | 2005-11-08 21:39:27 -0800 | [diff] [blame] | 435 | for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev); |
NeilBrown | cf30a47 | 2006-01-06 00:20:23 -0800 | [diff] [blame] | 436 | r1_bio->bios[new_disk] == IO_BLOCKED || |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 437 | !rdev || !test_bit(In_sync, &rdev->flags) |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 438 | || test_bit(WriteMostly, &rdev->flags); |
Suzanne Wood | d6065f7 | 2005-11-08 21:39:27 -0800 | [diff] [blame] | 439 | rdev = rcu_dereference(conf->mirrors[++new_disk].rdev)) { |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 440 | |
NeilBrown | cf30a47 | 2006-01-06 00:20:23 -0800 | [diff] [blame] | 441 | if (rdev && test_bit(In_sync, &rdev->flags) && |
| 442 | r1_bio->bios[new_disk] != IO_BLOCKED) |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 443 | wonly_disk = new_disk; |
| 444 | |
| 445 | if (new_disk == conf->raid_disks - 1) { |
| 446 | new_disk = wonly_disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | break; |
| 448 | } |
| 449 | } |
| 450 | goto rb_out; |
| 451 | } |
| 452 | |
| 453 | |
| 454 | /* make sure the disk is operational */ |
Suzanne Wood | d6065f7 | 2005-11-08 21:39:27 -0800 | [diff] [blame] | 455 | for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev); |
NeilBrown | cf30a47 | 2006-01-06 00:20:23 -0800 | [diff] [blame] | 456 | r1_bio->bios[new_disk] == IO_BLOCKED || |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 457 | !rdev || !test_bit(In_sync, &rdev->flags) || |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 458 | test_bit(WriteMostly, &rdev->flags); |
Suzanne Wood | d6065f7 | 2005-11-08 21:39:27 -0800 | [diff] [blame] | 459 | rdev = rcu_dereference(conf->mirrors[new_disk].rdev)) { |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 460 | |
NeilBrown | cf30a47 | 2006-01-06 00:20:23 -0800 | [diff] [blame] | 461 | if (rdev && test_bit(In_sync, &rdev->flags) && |
| 462 | r1_bio->bios[new_disk] != IO_BLOCKED) |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 463 | wonly_disk = new_disk; |
| 464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | if (new_disk <= 0) |
| 466 | new_disk = conf->raid_disks; |
| 467 | new_disk--; |
| 468 | if (new_disk == disk) { |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 469 | new_disk = wonly_disk; |
| 470 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | } |
| 472 | } |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 473 | |
| 474 | if (new_disk < 0) |
| 475 | goto rb_out; |
| 476 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | disk = new_disk; |
| 478 | /* now disk == new_disk == starting point for search */ |
| 479 | |
| 480 | /* |
| 481 | * Don't change to another disk for sequential reads: |
| 482 | */ |
| 483 | if (conf->next_seq_sect == this_sector) |
| 484 | goto rb_out; |
| 485 | if (this_sector == conf->mirrors[new_disk].head_position) |
| 486 | goto rb_out; |
| 487 | |
| 488 | current_distance = abs(this_sector - conf->mirrors[disk].head_position); |
| 489 | |
| 490 | /* Find the disk whose head is closest */ |
| 491 | |
| 492 | do { |
| 493 | if (disk <= 0) |
| 494 | disk = conf->raid_disks; |
| 495 | disk--; |
| 496 | |
Suzanne Wood | d6065f7 | 2005-11-08 21:39:27 -0800 | [diff] [blame] | 497 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 498 | |
NeilBrown | cf30a47 | 2006-01-06 00:20:23 -0800 | [diff] [blame] | 499 | if (!rdev || r1_bio->bios[disk] == IO_BLOCKED || |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 500 | !test_bit(In_sync, &rdev->flags) || |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 501 | test_bit(WriteMostly, &rdev->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | continue; |
| 503 | |
| 504 | if (!atomic_read(&rdev->nr_pending)) { |
| 505 | new_disk = disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | break; |
| 507 | } |
| 508 | new_distance = abs(this_sector - conf->mirrors[disk].head_position); |
| 509 | if (new_distance < current_distance) { |
| 510 | current_distance = new_distance; |
| 511 | new_disk = disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | } |
| 513 | } while (disk != conf->last_used); |
| 514 | |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 515 | rb_out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
| 517 | |
| 518 | if (new_disk >= 0) { |
Suzanne Wood | d6065f7 | 2005-11-08 21:39:27 -0800 | [diff] [blame] | 519 | rdev = rcu_dereference(conf->mirrors[new_disk].rdev); |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 520 | if (!rdev) |
| 521 | goto retry; |
| 522 | atomic_inc(&rdev->nr_pending); |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 523 | if (!test_bit(In_sync, &rdev->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | /* cannot risk returning a device that failed |
| 525 | * before we inc'ed nr_pending |
| 526 | */ |
NeilBrown | 03c902e | 2006-01-06 00:20:46 -0800 | [diff] [blame] | 527 | rdev_dec_pending(rdev, conf->mddev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | goto retry; |
| 529 | } |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 530 | conf->next_seq_sect = this_sector + sectors; |
| 531 | conf->last_used = new_disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | } |
| 533 | rcu_read_unlock(); |
| 534 | |
| 535 | return new_disk; |
| 536 | } |
| 537 | |
| 538 | static void unplug_slaves(mddev_t *mddev) |
| 539 | { |
| 540 | conf_t *conf = mddev_to_conf(mddev); |
| 541 | int i; |
| 542 | |
| 543 | rcu_read_lock(); |
| 544 | for (i=0; i<mddev->raid_disks; i++) { |
Suzanne Wood | d6065f7 | 2005-11-08 21:39:27 -0800 | [diff] [blame] | 545 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 546 | if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 547 | struct request_queue *r_queue = bdev_get_queue(rdev->bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
| 549 | atomic_inc(&rdev->nr_pending); |
| 550 | rcu_read_unlock(); |
| 551 | |
Alan D. Brunelle | 2ad8b1e | 2007-11-07 14:26:56 -0500 | [diff] [blame] | 552 | blk_unplug(r_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
| 554 | rdev_dec_pending(rdev, mddev); |
| 555 | rcu_read_lock(); |
| 556 | } |
| 557 | } |
| 558 | rcu_read_unlock(); |
| 559 | } |
| 560 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 561 | static void raid1_unplug(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | { |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 563 | mddev_t *mddev = q->queuedata; |
| 564 | |
| 565 | unplug_slaves(mddev); |
| 566 | md_wakeup_thread(mddev->thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | } |
| 568 | |
NeilBrown | 0d12922 | 2006-10-03 01:15:54 -0700 | [diff] [blame] | 569 | static int raid1_congested(void *data, int bits) |
| 570 | { |
| 571 | mddev_t *mddev = data; |
| 572 | conf_t *conf = mddev_to_conf(mddev); |
| 573 | int i, ret = 0; |
| 574 | |
| 575 | rcu_read_lock(); |
| 576 | for (i = 0; i < mddev->raid_disks; i++) { |
| 577 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
| 578 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 579 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
NeilBrown | 0d12922 | 2006-10-03 01:15:54 -0700 | [diff] [blame] | 580 | |
| 581 | /* Note the '|| 1' - when read_balance prefers |
| 582 | * non-congested targets, it can be removed |
| 583 | */ |
| 584 | if ((bits & (1<<BDI_write_congested)) || 1) |
| 585 | ret |= bdi_congested(&q->backing_dev_info, bits); |
| 586 | else |
| 587 | ret &= bdi_congested(&q->backing_dev_info, bits); |
| 588 | } |
| 589 | } |
| 590 | rcu_read_unlock(); |
| 591 | return ret; |
| 592 | } |
| 593 | |
| 594 | |
NeilBrown | a35e63e | 2008-03-04 14:29:29 -0800 | [diff] [blame] | 595 | static int flush_pending_writes(conf_t *conf) |
| 596 | { |
| 597 | /* Any writes that have been queued but are awaiting |
| 598 | * bitmap updates get flushed here. |
| 599 | * We return 1 if any requests were actually submitted. |
| 600 | */ |
| 601 | int rv = 0; |
| 602 | |
| 603 | spin_lock_irq(&conf->device_lock); |
| 604 | |
| 605 | if (conf->pending_bio_list.head) { |
| 606 | struct bio *bio; |
| 607 | bio = bio_list_get(&conf->pending_bio_list); |
| 608 | blk_remove_plug(conf->mddev->queue); |
| 609 | spin_unlock_irq(&conf->device_lock); |
| 610 | /* flush any pending bitmap writes to |
| 611 | * disk before proceeding w/ I/O */ |
| 612 | bitmap_unplug(conf->mddev->bitmap); |
| 613 | |
| 614 | while (bio) { /* submit pending writes */ |
| 615 | struct bio *next = bio->bi_next; |
| 616 | bio->bi_next = NULL; |
| 617 | generic_make_request(bio); |
| 618 | bio = next; |
| 619 | } |
| 620 | rv = 1; |
| 621 | } else |
| 622 | spin_unlock_irq(&conf->device_lock); |
| 623 | return rv; |
| 624 | } |
| 625 | |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 626 | /* Barriers.... |
| 627 | * Sometimes we need to suspend IO while we do something else, |
| 628 | * either some resync/recovery, or reconfigure the array. |
| 629 | * To do this we raise a 'barrier'. |
| 630 | * The 'barrier' is a counter that can be raised multiple times |
| 631 | * to count how many activities are happening which preclude |
| 632 | * normal IO. |
| 633 | * We can only raise the barrier if there is no pending IO. |
| 634 | * i.e. if nr_pending == 0. |
| 635 | * We choose only to raise the barrier if no-one is waiting for the |
| 636 | * barrier to go down. This means that as soon as an IO request |
| 637 | * is ready, no other operations which require a barrier will start |
| 638 | * until the IO request has had a chance. |
| 639 | * |
| 640 | * So: regular IO calls 'wait_barrier'. When that returns there |
| 641 | * is no backgroup IO happening, It must arrange to call |
| 642 | * allow_barrier when it has finished its IO. |
| 643 | * backgroup IO calls must call raise_barrier. Once that returns |
| 644 | * there is no normal IO happeing. It must arrange to call |
| 645 | * lower_barrier when the particular background IO completes. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | */ |
| 647 | #define RESYNC_DEPTH 32 |
| 648 | |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 649 | static void raise_barrier(conf_t *conf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | { |
| 651 | spin_lock_irq(&conf->resync_lock); |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 652 | |
| 653 | /* Wait until no block IO is waiting */ |
| 654 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, |
| 655 | conf->resync_lock, |
| 656 | raid1_unplug(conf->mddev->queue)); |
| 657 | |
| 658 | /* block any new IO from starting */ |
| 659 | conf->barrier++; |
| 660 | |
| 661 | /* No wait for all pending IO to complete */ |
| 662 | wait_event_lock_irq(conf->wait_barrier, |
| 663 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, |
| 664 | conf->resync_lock, |
| 665 | raid1_unplug(conf->mddev->queue)); |
| 666 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | spin_unlock_irq(&conf->resync_lock); |
| 668 | } |
| 669 | |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 670 | static void lower_barrier(conf_t *conf) |
| 671 | { |
| 672 | unsigned long flags; |
| 673 | spin_lock_irqsave(&conf->resync_lock, flags); |
| 674 | conf->barrier--; |
| 675 | spin_unlock_irqrestore(&conf->resync_lock, flags); |
| 676 | wake_up(&conf->wait_barrier); |
| 677 | } |
| 678 | |
| 679 | static void wait_barrier(conf_t *conf) |
| 680 | { |
| 681 | spin_lock_irq(&conf->resync_lock); |
| 682 | if (conf->barrier) { |
| 683 | conf->nr_waiting++; |
| 684 | wait_event_lock_irq(conf->wait_barrier, !conf->barrier, |
| 685 | conf->resync_lock, |
| 686 | raid1_unplug(conf->mddev->queue)); |
| 687 | conf->nr_waiting--; |
| 688 | } |
| 689 | conf->nr_pending++; |
| 690 | spin_unlock_irq(&conf->resync_lock); |
| 691 | } |
| 692 | |
| 693 | static void allow_barrier(conf_t *conf) |
| 694 | { |
| 695 | unsigned long flags; |
| 696 | spin_lock_irqsave(&conf->resync_lock, flags); |
| 697 | conf->nr_pending--; |
| 698 | spin_unlock_irqrestore(&conf->resync_lock, flags); |
| 699 | wake_up(&conf->wait_barrier); |
| 700 | } |
| 701 | |
NeilBrown | ddaf22a | 2006-01-06 00:20:19 -0800 | [diff] [blame] | 702 | static void freeze_array(conf_t *conf) |
| 703 | { |
| 704 | /* stop syncio and normal IO and wait for everything to |
| 705 | * go quite. |
| 706 | * We increment barrier and nr_waiting, and then |
NeilBrown | 1c83053 | 2008-03-04 14:29:35 -0800 | [diff] [blame] | 707 | * wait until nr_pending match nr_queued+1 |
| 708 | * This is called in the context of one normal IO request |
| 709 | * that has failed. Thus any sync request that might be pending |
| 710 | * will be blocked by nr_pending, and we need to wait for |
| 711 | * pending IO requests to complete or be queued for re-try. |
| 712 | * Thus the number queued (nr_queued) plus this request (1) |
| 713 | * must match the number of pending IOs (nr_pending) before |
| 714 | * we continue. |
NeilBrown | ddaf22a | 2006-01-06 00:20:19 -0800 | [diff] [blame] | 715 | */ |
| 716 | spin_lock_irq(&conf->resync_lock); |
| 717 | conf->barrier++; |
| 718 | conf->nr_waiting++; |
| 719 | wait_event_lock_irq(conf->wait_barrier, |
NeilBrown | 1c83053 | 2008-03-04 14:29:35 -0800 | [diff] [blame] | 720 | conf->nr_pending == conf->nr_queued+1, |
NeilBrown | ddaf22a | 2006-01-06 00:20:19 -0800 | [diff] [blame] | 721 | conf->resync_lock, |
NeilBrown | a35e63e | 2008-03-04 14:29:29 -0800 | [diff] [blame] | 722 | ({ flush_pending_writes(conf); |
| 723 | raid1_unplug(conf->mddev->queue); })); |
NeilBrown | ddaf22a | 2006-01-06 00:20:19 -0800 | [diff] [blame] | 724 | spin_unlock_irq(&conf->resync_lock); |
| 725 | } |
| 726 | static void unfreeze_array(conf_t *conf) |
| 727 | { |
| 728 | /* reverse the effect of the freeze */ |
| 729 | spin_lock_irq(&conf->resync_lock); |
| 730 | conf->barrier--; |
| 731 | conf->nr_waiting--; |
| 732 | wake_up(&conf->wait_barrier); |
| 733 | spin_unlock_irq(&conf->resync_lock); |
| 734 | } |
| 735 | |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 736 | |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 737 | /* duplicate the data pages for behind I/O */ |
| 738 | static struct page **alloc_behind_pages(struct bio *bio) |
| 739 | { |
| 740 | int i; |
| 741 | struct bio_vec *bvec; |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 742 | struct page **pages = kzalloc(bio->bi_vcnt * sizeof(struct page *), |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 743 | GFP_NOIO); |
| 744 | if (unlikely(!pages)) |
| 745 | goto do_sync_io; |
| 746 | |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 747 | bio_for_each_segment(bvec, bio, i) { |
| 748 | pages[i] = alloc_page(GFP_NOIO); |
| 749 | if (unlikely(!pages[i])) |
| 750 | goto do_sync_io; |
| 751 | memcpy(kmap(pages[i]) + bvec->bv_offset, |
| 752 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); |
| 753 | kunmap(pages[i]); |
| 754 | kunmap(bvec->bv_page); |
| 755 | } |
| 756 | |
| 757 | return pages; |
| 758 | |
| 759 | do_sync_io: |
| 760 | if (pages) |
| 761 | for (i = 0; i < bio->bi_vcnt && pages[i]; i++) |
NeilBrown | 2d1f3b5 | 2006-01-06 00:20:31 -0800 | [diff] [blame] | 762 | put_page(pages[i]); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 763 | kfree(pages); |
| 764 | PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); |
| 765 | return NULL; |
| 766 | } |
| 767 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 768 | static int make_request(struct request_queue *q, struct bio * bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | { |
| 770 | mddev_t *mddev = q->queuedata; |
| 771 | conf_t *conf = mddev_to_conf(mddev); |
| 772 | mirror_info_t *mirror; |
| 773 | r1bio_t *r1_bio; |
| 774 | struct bio *read_bio; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 775 | int i, targets = 0, disks; |
NeilBrown | 84255d1 | 2008-05-23 13:04:32 -0700 | [diff] [blame] | 776 | struct bitmap *bitmap; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 777 | unsigned long flags; |
| 778 | struct bio_list bl; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 779 | struct page **behind_pages = NULL; |
Jens Axboe | a362357 | 2005-11-01 09:26:16 +0100 | [diff] [blame] | 780 | const int rw = bio_data_dir(bio); |
Lars Ellenberg | e3881a6 | 2007-01-10 23:15:37 -0800 | [diff] [blame] | 781 | const int do_sync = bio_sync(bio); |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 782 | int do_barriers; |
Dan Williams | 6bfe0b4 | 2008-04-30 00:52:32 -0700 | [diff] [blame] | 783 | mdk_rdev_t *blocked_rdev; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 784 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | /* |
| 786 | * Register the new request and wait if the reconstruction |
| 787 | * thread has put up a bar for new requests. |
| 788 | * Continue immediately if no resync is active currently. |
NeilBrown | 62de608 | 2006-05-01 12:15:47 -0700 | [diff] [blame] | 789 | * We test barriers_work *after* md_write_start as md_write_start |
| 790 | * may cause the first superblock write, and that will check out |
| 791 | * if barriers work. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | */ |
NeilBrown | 62de608 | 2006-05-01 12:15:47 -0700 | [diff] [blame] | 793 | |
NeilBrown | 3d310eb | 2005-06-21 17:17:26 -0700 | [diff] [blame] | 794 | md_write_start(mddev, bio); /* wait on superblock update early */ |
| 795 | |
NeilBrown | 62de608 | 2006-05-01 12:15:47 -0700 | [diff] [blame] | 796 | if (unlikely(!mddev->barriers_work && bio_barrier(bio))) { |
| 797 | if (rw == WRITE) |
| 798 | md_write_end(mddev); |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 799 | bio_endio(bio, -EOPNOTSUPP); |
NeilBrown | 62de608 | 2006-05-01 12:15:47 -0700 | [diff] [blame] | 800 | return 0; |
| 801 | } |
| 802 | |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 803 | wait_barrier(conf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
NeilBrown | 84255d1 | 2008-05-23 13:04:32 -0700 | [diff] [blame] | 805 | bitmap = mddev->bitmap; |
| 806 | |
Jens Axboe | a362357 | 2005-11-01 09:26:16 +0100 | [diff] [blame] | 807 | disk_stat_inc(mddev->gendisk, ios[rw]); |
| 808 | disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
| 810 | /* |
| 811 | * make_request() can abort the operation when READA is being |
| 812 | * used and no empty request is available. |
| 813 | * |
| 814 | */ |
| 815 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); |
| 816 | |
| 817 | r1_bio->master_bio = bio; |
| 818 | r1_bio->sectors = bio->bi_size >> 9; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 819 | r1_bio->state = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | r1_bio->mddev = mddev; |
| 821 | r1_bio->sector = bio->bi_sector; |
| 822 | |
Jens Axboe | a362357 | 2005-11-01 09:26:16 +0100 | [diff] [blame] | 823 | if (rw == READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | /* |
| 825 | * read balancing logic: |
| 826 | */ |
| 827 | int rdisk = read_balance(conf, r1_bio); |
| 828 | |
| 829 | if (rdisk < 0) { |
| 830 | /* couldn't find anywhere to read from */ |
| 831 | raid_end_bio_io(r1_bio); |
| 832 | return 0; |
| 833 | } |
| 834 | mirror = conf->mirrors + rdisk; |
| 835 | |
| 836 | r1_bio->read_disk = rdisk; |
| 837 | |
| 838 | read_bio = bio_clone(bio, GFP_NOIO); |
| 839 | |
| 840 | r1_bio->bios[rdisk] = read_bio; |
| 841 | |
| 842 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; |
| 843 | read_bio->bi_bdev = mirror->rdev->bdev; |
| 844 | read_bio->bi_end_io = raid1_end_read_request; |
Lars Ellenberg | e3881a6 | 2007-01-10 23:15:37 -0800 | [diff] [blame] | 845 | read_bio->bi_rw = READ | do_sync; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | read_bio->bi_private = r1_bio; |
| 847 | |
| 848 | generic_make_request(read_bio); |
| 849 | return 0; |
| 850 | } |
| 851 | |
| 852 | /* |
| 853 | * WRITE: |
| 854 | */ |
| 855 | /* first select target devices under spinlock and |
| 856 | * inc refcount on their rdev. Record them by setting |
| 857 | * bios[x] to bio |
| 858 | */ |
| 859 | disks = conf->raid_disks; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 860 | #if 0 |
| 861 | { static int first=1; |
| 862 | if (first) printk("First Write sector %llu disks %d\n", |
| 863 | (unsigned long long)r1_bio->sector, disks); |
| 864 | first = 0; |
| 865 | } |
| 866 | #endif |
Dan Williams | 6bfe0b4 | 2008-04-30 00:52:32 -0700 | [diff] [blame] | 867 | retry_write: |
| 868 | blocked_rdev = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | rcu_read_lock(); |
| 870 | for (i = 0; i < disks; i++) { |
Dan Williams | 6bfe0b4 | 2008-04-30 00:52:32 -0700 | [diff] [blame] | 871 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
| 872 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
| 873 | atomic_inc(&rdev->nr_pending); |
| 874 | blocked_rdev = rdev; |
| 875 | break; |
| 876 | } |
| 877 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | atomic_inc(&rdev->nr_pending); |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 879 | if (test_bit(Faulty, &rdev->flags)) { |
NeilBrown | 03c902e | 2006-01-06 00:20:46 -0800 | [diff] [blame] | 880 | rdev_dec_pending(rdev, mddev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | r1_bio->bios[i] = NULL; |
| 882 | } else |
| 883 | r1_bio->bios[i] = bio; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 884 | targets++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | } else |
| 886 | r1_bio->bios[i] = NULL; |
| 887 | } |
| 888 | rcu_read_unlock(); |
| 889 | |
Dan Williams | 6bfe0b4 | 2008-04-30 00:52:32 -0700 | [diff] [blame] | 890 | if (unlikely(blocked_rdev)) { |
| 891 | /* Wait for this device to become unblocked */ |
| 892 | int j; |
| 893 | |
| 894 | for (j = 0; j < i; j++) |
| 895 | if (r1_bio->bios[j]) |
| 896 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); |
| 897 | |
| 898 | allow_barrier(conf); |
| 899 | md_wait_for_blocked_rdev(blocked_rdev, mddev); |
| 900 | wait_barrier(conf); |
| 901 | goto retry_write; |
| 902 | } |
| 903 | |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 904 | BUG_ON(targets == 0); /* we never fail the last device */ |
| 905 | |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 906 | if (targets < conf->raid_disks) { |
| 907 | /* array is degraded, we will not clear the bitmap |
| 908 | * on I/O completion (see raid1_end_write_request) */ |
| 909 | set_bit(R1BIO_Degraded, &r1_bio->state); |
| 910 | } |
NeilBrown | 06d91a5 | 2005-06-21 17:17:12 -0700 | [diff] [blame] | 911 | |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 912 | /* do behind I/O ? */ |
| 913 | if (bitmap && |
| 914 | atomic_read(&bitmap->behind_writes) < bitmap->max_write_behind && |
| 915 | (behind_pages = alloc_behind_pages(bio)) != NULL) |
| 916 | set_bit(R1BIO_BehindIO, &r1_bio->state); |
| 917 | |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 918 | atomic_set(&r1_bio->remaining, 0); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 919 | atomic_set(&r1_bio->behind_remaining, 0); |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 920 | |
NeilBrown | 04b857f | 2006-03-09 17:33:46 -0800 | [diff] [blame] | 921 | do_barriers = bio_barrier(bio); |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 922 | if (do_barriers) |
| 923 | set_bit(R1BIO_Barrier, &r1_bio->state); |
| 924 | |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 925 | bio_list_init(&bl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | for (i = 0; i < disks; i++) { |
| 927 | struct bio *mbio; |
| 928 | if (!r1_bio->bios[i]) |
| 929 | continue; |
| 930 | |
| 931 | mbio = bio_clone(bio, GFP_NOIO); |
| 932 | r1_bio->bios[i] = mbio; |
| 933 | |
| 934 | mbio->bi_sector = r1_bio->sector + conf->mirrors[i].rdev->data_offset; |
| 935 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; |
| 936 | mbio->bi_end_io = raid1_end_write_request; |
Lars Ellenberg | e3881a6 | 2007-01-10 23:15:37 -0800 | [diff] [blame] | 937 | mbio->bi_rw = WRITE | do_barriers | do_sync; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | mbio->bi_private = r1_bio; |
| 939 | |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 940 | if (behind_pages) { |
| 941 | struct bio_vec *bvec; |
| 942 | int j; |
| 943 | |
| 944 | /* Yes, I really want the '__' version so that |
| 945 | * we clear any unused pointer in the io_vec, rather |
| 946 | * than leave them unchanged. This is important |
| 947 | * because when we come to free the pages, we won't |
| 948 | * know the originial bi_idx, so we just free |
| 949 | * them all |
| 950 | */ |
| 951 | __bio_for_each_segment(bvec, mbio, j, 0) |
| 952 | bvec->bv_page = behind_pages[j]; |
| 953 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
| 954 | atomic_inc(&r1_bio->behind_remaining); |
| 955 | } |
| 956 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | atomic_inc(&r1_bio->remaining); |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 958 | |
| 959 | bio_list_add(&bl, mbio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | } |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 961 | kfree(behind_pages); /* the behind pages are attached to the bios now */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 963 | bitmap_startwrite(bitmap, bio->bi_sector, r1_bio->sectors, |
| 964 | test_bit(R1BIO_BehindIO, &r1_bio->state)); |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 965 | spin_lock_irqsave(&conf->device_lock, flags); |
| 966 | bio_list_merge(&conf->pending_bio_list, &bl); |
| 967 | bio_list_init(&bl); |
| 968 | |
| 969 | blk_plug_device(mddev->queue); |
| 970 | spin_unlock_irqrestore(&conf->device_lock, flags); |
| 971 | |
NeilBrown | a35e63e | 2008-03-04 14:29:29 -0800 | [diff] [blame] | 972 | /* In case raid1d snuck into freeze_array */ |
| 973 | wake_up(&conf->wait_barrier); |
| 974 | |
Lars Ellenberg | e3881a6 | 2007-01-10 23:15:37 -0800 | [diff] [blame] | 975 | if (do_sync) |
| 976 | md_wakeup_thread(mddev->thread); |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 977 | #if 0 |
| 978 | while ((bio = bio_list_pop(&bl)) != NULL) |
| 979 | generic_make_request(bio); |
| 980 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | |
| 982 | return 0; |
| 983 | } |
| 984 | |
| 985 | static void status(struct seq_file *seq, mddev_t *mddev) |
| 986 | { |
| 987 | conf_t *conf = mddev_to_conf(mddev); |
| 988 | int i; |
| 989 | |
| 990 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, |
NeilBrown | 11ce99e | 2006-10-03 01:15:52 -0700 | [diff] [blame] | 991 | conf->raid_disks - mddev->degraded); |
NeilBrown | ddac7c7 | 2006-08-31 21:27:36 -0700 | [diff] [blame] | 992 | rcu_read_lock(); |
| 993 | for (i = 0; i < conf->raid_disks; i++) { |
| 994 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | seq_printf(seq, "%s", |
NeilBrown | ddac7c7 | 2006-08-31 21:27:36 -0700 | [diff] [blame] | 996 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
| 997 | } |
| 998 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | seq_printf(seq, "]"); |
| 1000 | } |
| 1001 | |
| 1002 | |
| 1003 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) |
| 1004 | { |
| 1005 | char b[BDEVNAME_SIZE]; |
| 1006 | conf_t *conf = mddev_to_conf(mddev); |
| 1007 | |
| 1008 | /* |
| 1009 | * If it is not operational, then we have already marked it as dead |
| 1010 | * else if it is the last working disks, ignore the error, let the |
| 1011 | * next level up know. |
| 1012 | * else mark the drive as failed |
| 1013 | */ |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 1014 | if (test_bit(In_sync, &rdev->flags) |
NeilBrown | 11ce99e | 2006-10-03 01:15:52 -0700 | [diff] [blame] | 1015 | && (conf->raid_disks - mddev->degraded) == 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | /* |
| 1017 | * Don't fail the drive, act as though we were just a |
| 1018 | * normal single drive |
| 1019 | */ |
| 1020 | return; |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 1021 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
| 1022 | unsigned long flags; |
| 1023 | spin_lock_irqsave(&conf->device_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | mddev->degraded++; |
NeilBrown | dd00a99 | 2007-05-10 03:15:50 -0700 | [diff] [blame] | 1025 | set_bit(Faulty, &rdev->flags); |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 1026 | spin_unlock_irqrestore(&conf->device_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | /* |
| 1028 | * if recovery is running, make sure it aborts. |
| 1029 | */ |
NeilBrown | dfc7064 | 2008-05-23 13:04:39 -0700 | [diff] [blame] | 1030 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
NeilBrown | dd00a99 | 2007-05-10 03:15:50 -0700 | [diff] [blame] | 1031 | } else |
| 1032 | set_bit(Faulty, &rdev->flags); |
NeilBrown | 850b2b4 | 2006-10-03 01:15:46 -0700 | [diff] [blame] | 1033 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
Nick Andrew | d7a420c | 2008-04-28 02:15:55 -0700 | [diff] [blame] | 1034 | printk(KERN_ALERT "raid1: Disk failure on %s, disabling device.\n" |
| 1035 | "raid1: Operation continuing on %d devices.\n", |
NeilBrown | 11ce99e | 2006-10-03 01:15:52 -0700 | [diff] [blame] | 1036 | bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | } |
| 1038 | |
| 1039 | static void print_conf(conf_t *conf) |
| 1040 | { |
| 1041 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | |
| 1043 | printk("RAID1 conf printout:\n"); |
| 1044 | if (!conf) { |
| 1045 | printk("(!conf)\n"); |
| 1046 | return; |
| 1047 | } |
NeilBrown | 11ce99e | 2006-10-03 01:15:52 -0700 | [diff] [blame] | 1048 | printk(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | conf->raid_disks); |
| 1050 | |
NeilBrown | ddac7c7 | 2006-08-31 21:27:36 -0700 | [diff] [blame] | 1051 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | for (i = 0; i < conf->raid_disks; i++) { |
| 1053 | char b[BDEVNAME_SIZE]; |
NeilBrown | ddac7c7 | 2006-08-31 21:27:36 -0700 | [diff] [blame] | 1054 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
| 1055 | if (rdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | printk(" disk %d, wo:%d, o:%d, dev:%s\n", |
NeilBrown | ddac7c7 | 2006-08-31 21:27:36 -0700 | [diff] [blame] | 1057 | i, !test_bit(In_sync, &rdev->flags), |
| 1058 | !test_bit(Faulty, &rdev->flags), |
| 1059 | bdevname(rdev->bdev,b)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | } |
NeilBrown | ddac7c7 | 2006-08-31 21:27:36 -0700 | [diff] [blame] | 1061 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | } |
| 1063 | |
| 1064 | static void close_sync(conf_t *conf) |
| 1065 | { |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 1066 | wait_barrier(conf); |
| 1067 | allow_barrier(conf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | |
| 1069 | mempool_destroy(conf->r1buf_pool); |
| 1070 | conf->r1buf_pool = NULL; |
| 1071 | } |
| 1072 | |
| 1073 | static int raid1_spare_active(mddev_t *mddev) |
| 1074 | { |
| 1075 | int i; |
| 1076 | conf_t *conf = mddev->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | |
| 1078 | /* |
| 1079 | * Find all failed disks within the RAID1 configuration |
NeilBrown | ddac7c7 | 2006-08-31 21:27:36 -0700 | [diff] [blame] | 1080 | * and mark them readable. |
| 1081 | * Called under mddev lock, so rcu protection not needed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | */ |
| 1083 | for (i = 0; i < conf->raid_disks; i++) { |
NeilBrown | ddac7c7 | 2006-08-31 21:27:36 -0700 | [diff] [blame] | 1084 | mdk_rdev_t *rdev = conf->mirrors[i].rdev; |
| 1085 | if (rdev |
| 1086 | && !test_bit(Faulty, &rdev->flags) |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 1087 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
| 1088 | unsigned long flags; |
| 1089 | spin_lock_irqsave(&conf->device_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | mddev->degraded--; |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 1091 | spin_unlock_irqrestore(&conf->device_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | } |
| 1093 | } |
| 1094 | |
| 1095 | print_conf(conf); |
| 1096 | return 0; |
| 1097 | } |
| 1098 | |
| 1099 | |
| 1100 | static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) |
| 1101 | { |
| 1102 | conf_t *conf = mddev->private; |
Neil Brown | 199050e | 2008-06-28 08:31:33 +1000 | [diff] [blame^] | 1103 | int err = -EEXIST; |
NeilBrown | 41158c7 | 2005-06-21 17:17:25 -0700 | [diff] [blame] | 1104 | int mirror = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | mirror_info_t *p; |
Neil Brown | 6c2fce2 | 2008-06-28 08:31:31 +1000 | [diff] [blame] | 1106 | int first = 0; |
| 1107 | int last = mddev->raid_disks - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | |
Neil Brown | 6c2fce2 | 2008-06-28 08:31:31 +1000 | [diff] [blame] | 1109 | if (rdev->raid_disk >= 0) |
| 1110 | first = last = rdev->raid_disk; |
| 1111 | |
| 1112 | for (mirror = first; mirror <= last; mirror++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | if ( !(p=conf->mirrors+mirror)->rdev) { |
| 1114 | |
| 1115 | blk_queue_stack_limits(mddev->queue, |
| 1116 | rdev->bdev->bd_disk->queue); |
| 1117 | /* as we don't honour merge_bvec_fn, we must never risk |
| 1118 | * violating it, so limit ->max_sector to one PAGE, as |
| 1119 | * a one page request is never in violation. |
| 1120 | */ |
| 1121 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn && |
| 1122 | mddev->queue->max_sectors > (PAGE_SIZE>>9)) |
| 1123 | blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); |
| 1124 | |
| 1125 | p->head_position = 0; |
| 1126 | rdev->raid_disk = mirror; |
Neil Brown | 199050e | 2008-06-28 08:31:33 +1000 | [diff] [blame^] | 1127 | err = 0; |
NeilBrown | 6aea114a | 2005-11-28 13:44:13 -0800 | [diff] [blame] | 1128 | /* As all devices are equivalent, we don't need a full recovery |
| 1129 | * if this was recently any drive of the array |
| 1130 | */ |
| 1131 | if (rdev->saved_raid_disk < 0) |
NeilBrown | 41158c7 | 2005-06-21 17:17:25 -0700 | [diff] [blame] | 1132 | conf->fullsync = 1; |
Suzanne Wood | d6065f7 | 2005-11-08 21:39:27 -0800 | [diff] [blame] | 1133 | rcu_assign_pointer(p->rdev, rdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | break; |
| 1135 | } |
| 1136 | |
| 1137 | print_conf(conf); |
Neil Brown | 199050e | 2008-06-28 08:31:33 +1000 | [diff] [blame^] | 1138 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | } |
| 1140 | |
| 1141 | static int raid1_remove_disk(mddev_t *mddev, int number) |
| 1142 | { |
| 1143 | conf_t *conf = mddev->private; |
| 1144 | int err = 0; |
| 1145 | mdk_rdev_t *rdev; |
| 1146 | mirror_info_t *p = conf->mirrors+ number; |
| 1147 | |
| 1148 | print_conf(conf); |
| 1149 | rdev = p->rdev; |
| 1150 | if (rdev) { |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 1151 | if (test_bit(In_sync, &rdev->flags) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | atomic_read(&rdev->nr_pending)) { |
| 1153 | err = -EBUSY; |
| 1154 | goto abort; |
| 1155 | } |
NeilBrown | dfc7064 | 2008-05-23 13:04:39 -0700 | [diff] [blame] | 1156 | /* Only remove non-faulty devices is recovery |
| 1157 | * is not possible. |
| 1158 | */ |
| 1159 | if (!test_bit(Faulty, &rdev->flags) && |
| 1160 | mddev->degraded < conf->raid_disks) { |
| 1161 | err = -EBUSY; |
| 1162 | goto abort; |
| 1163 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | p->rdev = NULL; |
Paul E. McKenney | fbd568a3e | 2005-05-01 08:59:04 -0700 | [diff] [blame] | 1165 | synchronize_rcu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | if (atomic_read(&rdev->nr_pending)) { |
| 1167 | /* lost the race, try later */ |
| 1168 | err = -EBUSY; |
| 1169 | p->rdev = rdev; |
| 1170 | } |
| 1171 | } |
| 1172 | abort: |
| 1173 | |
| 1174 | print_conf(conf); |
| 1175 | return err; |
| 1176 | } |
| 1177 | |
| 1178 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 1179 | static void end_sync_read(struct bio *bio, int error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1182 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1184 | for (i=r1_bio->mddev->raid_disks; i--; ) |
| 1185 | if (r1_bio->bios[i] == bio) |
| 1186 | break; |
| 1187 | BUG_ON(i < 0); |
| 1188 | update_head_pos(i, r1_bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | /* |
| 1190 | * we have read a block, now it needs to be re-written, |
| 1191 | * or re-read if the read failed. |
| 1192 | * We don't do much here, just schedule handling by raid1d |
| 1193 | */ |
NeilBrown | 69382e8 | 2006-01-06 00:20:22 -0800 | [diff] [blame] | 1194 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1196 | |
| 1197 | if (atomic_dec_and_test(&r1_bio->remaining)) |
| 1198 | reschedule_retry(r1_bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | } |
| 1200 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 1201 | static void end_sync_write(struct bio *bio, int error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | { |
| 1203 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
| 1204 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); |
| 1205 | mddev_t *mddev = r1_bio->mddev; |
| 1206 | conf_t *conf = mddev_to_conf(mddev); |
| 1207 | int i; |
| 1208 | int mirror=0; |
| 1209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | for (i = 0; i < conf->raid_disks; i++) |
| 1211 | if (r1_bio->bios[i] == bio) { |
| 1212 | mirror = i; |
| 1213 | break; |
| 1214 | } |
NeilBrown | 6b1117d | 2006-03-31 02:31:57 -0800 | [diff] [blame] | 1215 | if (!uptodate) { |
| 1216 | int sync_blocks = 0; |
| 1217 | sector_t s = r1_bio->sector; |
| 1218 | long sectors_to_go = r1_bio->sectors; |
| 1219 | /* make sure these bits doesn't get cleared. */ |
| 1220 | do { |
NeilBrown | 5e3db64 | 2006-07-10 04:44:18 -0700 | [diff] [blame] | 1221 | bitmap_end_sync(mddev->bitmap, s, |
NeilBrown | 6b1117d | 2006-03-31 02:31:57 -0800 | [diff] [blame] | 1222 | &sync_blocks, 1); |
| 1223 | s += sync_blocks; |
| 1224 | sectors_to_go -= sync_blocks; |
| 1225 | } while (sectors_to_go > 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | md_error(mddev, conf->mirrors[mirror].rdev); |
NeilBrown | 6b1117d | 2006-03-31 02:31:57 -0800 | [diff] [blame] | 1227 | } |
NeilBrown | e3b9703 | 2005-08-04 12:53:34 -0700 | [diff] [blame] | 1228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | update_head_pos(mirror, r1_bio); |
| 1230 | |
| 1231 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
| 1232 | md_done_sync(mddev, r1_bio->sectors, uptodate); |
| 1233 | put_buf(r1_bio); |
| 1234 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | } |
| 1236 | |
| 1237 | static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) |
| 1238 | { |
| 1239 | conf_t *conf = mddev_to_conf(mddev); |
| 1240 | int i; |
| 1241 | int disks = conf->raid_disks; |
| 1242 | struct bio *bio, *wbio; |
| 1243 | |
| 1244 | bio = r1_bio->bios[r1_bio->read_disk]; |
| 1245 | |
NeilBrown | 69382e8 | 2006-01-06 00:20:22 -0800 | [diff] [blame] | 1246 | |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1247 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
| 1248 | /* We have read all readable devices. If we haven't |
| 1249 | * got the block, then there is no hope left. |
| 1250 | * If we have, then we want to do a comparison |
| 1251 | * and skip the write if everything is the same. |
| 1252 | * If any blocks failed to read, then we need to |
| 1253 | * attempt an over-write |
| 1254 | */ |
| 1255 | int primary; |
| 1256 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) { |
| 1257 | for (i=0; i<mddev->raid_disks; i++) |
| 1258 | if (r1_bio->bios[i]->bi_end_io == end_sync_read) |
| 1259 | md_error(mddev, conf->mirrors[i].rdev); |
| 1260 | |
| 1261 | md_done_sync(mddev, r1_bio->sectors, 1); |
| 1262 | put_buf(r1_bio); |
| 1263 | return; |
| 1264 | } |
| 1265 | for (primary=0; primary<mddev->raid_disks; primary++) |
| 1266 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
| 1267 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { |
| 1268 | r1_bio->bios[primary]->bi_end_io = NULL; |
NeilBrown | 03c902e | 2006-01-06 00:20:46 -0800 | [diff] [blame] | 1269 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1270 | break; |
| 1271 | } |
| 1272 | r1_bio->read_disk = primary; |
| 1273 | for (i=0; i<mddev->raid_disks; i++) |
Mike Accetta | ed45666 | 2007-06-16 10:16:07 -0700 | [diff] [blame] | 1274 | if (r1_bio->bios[i]->bi_end_io == end_sync_read) { |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1275 | int j; |
| 1276 | int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); |
| 1277 | struct bio *pbio = r1_bio->bios[primary]; |
| 1278 | struct bio *sbio = r1_bio->bios[i]; |
Mike Accetta | ed45666 | 2007-06-16 10:16:07 -0700 | [diff] [blame] | 1279 | |
| 1280 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { |
| 1281 | for (j = vcnt; j-- ; ) { |
| 1282 | struct page *p, *s; |
| 1283 | p = pbio->bi_io_vec[j].bv_page; |
| 1284 | s = sbio->bi_io_vec[j].bv_page; |
| 1285 | if (memcmp(page_address(p), |
| 1286 | page_address(s), |
| 1287 | PAGE_SIZE)) |
| 1288 | break; |
| 1289 | } |
| 1290 | } else |
| 1291 | j = 0; |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1292 | if (j >= 0) |
| 1293 | mddev->resync_mismatches += r1_bio->sectors; |
NeilBrown | cf7a441 | 2007-10-16 23:30:55 -0700 | [diff] [blame] | 1294 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
| 1295 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1296 | sbio->bi_end_io = NULL; |
NeilBrown | 03c902e | 2006-01-06 00:20:46 -0800 | [diff] [blame] | 1297 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); |
| 1298 | } else { |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1299 | /* fixup the bio for reuse */ |
NeilBrown | 698b18c | 2008-05-23 13:04:35 -0700 | [diff] [blame] | 1300 | int size; |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1301 | sbio->bi_vcnt = vcnt; |
| 1302 | sbio->bi_size = r1_bio->sectors << 9; |
| 1303 | sbio->bi_idx = 0; |
| 1304 | sbio->bi_phys_segments = 0; |
| 1305 | sbio->bi_hw_segments = 0; |
| 1306 | sbio->bi_hw_front_size = 0; |
| 1307 | sbio->bi_hw_back_size = 0; |
| 1308 | sbio->bi_flags &= ~(BIO_POOL_MASK - 1); |
| 1309 | sbio->bi_flags |= 1 << BIO_UPTODATE; |
| 1310 | sbio->bi_next = NULL; |
| 1311 | sbio->bi_sector = r1_bio->sector + |
| 1312 | conf->mirrors[i].rdev->data_offset; |
| 1313 | sbio->bi_bdev = conf->mirrors[i].rdev->bdev; |
NeilBrown | 698b18c | 2008-05-23 13:04:35 -0700 | [diff] [blame] | 1314 | size = sbio->bi_size; |
| 1315 | for (j = 0; j < vcnt ; j++) { |
| 1316 | struct bio_vec *bi; |
| 1317 | bi = &sbio->bi_io_vec[j]; |
| 1318 | bi->bv_offset = 0; |
| 1319 | if (size > PAGE_SIZE) |
| 1320 | bi->bv_len = PAGE_SIZE; |
| 1321 | else |
| 1322 | bi->bv_len = size; |
| 1323 | size -= PAGE_SIZE; |
| 1324 | memcpy(page_address(bi->bv_page), |
NeilBrown | 3eda22d | 2007-01-26 00:57:01 -0800 | [diff] [blame] | 1325 | page_address(pbio->bi_io_vec[j].bv_page), |
| 1326 | PAGE_SIZE); |
NeilBrown | 698b18c | 2008-05-23 13:04:35 -0700 | [diff] [blame] | 1327 | } |
NeilBrown | 3eda22d | 2007-01-26 00:57:01 -0800 | [diff] [blame] | 1328 | |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1329 | } |
| 1330 | } |
| 1331 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) { |
NeilBrown | 69382e8 | 2006-01-06 00:20:22 -0800 | [diff] [blame] | 1333 | /* ouch - failed to read all of that. |
| 1334 | * Try some synchronous reads of other devices to get |
| 1335 | * good data, much like with normal read errors. Only |
NeilBrown | ddac7c7 | 2006-08-31 21:27:36 -0700 | [diff] [blame] | 1336 | * read into the pages we already have so we don't |
NeilBrown | 69382e8 | 2006-01-06 00:20:22 -0800 | [diff] [blame] | 1337 | * need to re-issue the read request. |
| 1338 | * We don't need to freeze the array, because being in an |
| 1339 | * active sync request, there is no normal IO, and |
| 1340 | * no overlapping syncs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | */ |
NeilBrown | 69382e8 | 2006-01-06 00:20:22 -0800 | [diff] [blame] | 1342 | sector_t sect = r1_bio->sector; |
| 1343 | int sectors = r1_bio->sectors; |
| 1344 | int idx = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | |
NeilBrown | 69382e8 | 2006-01-06 00:20:22 -0800 | [diff] [blame] | 1346 | while(sectors) { |
| 1347 | int s = sectors; |
| 1348 | int d = r1_bio->read_disk; |
| 1349 | int success = 0; |
| 1350 | mdk_rdev_t *rdev; |
| 1351 | |
| 1352 | if (s > (PAGE_SIZE>>9)) |
| 1353 | s = PAGE_SIZE >> 9; |
| 1354 | do { |
| 1355 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { |
NeilBrown | ddac7c7 | 2006-08-31 21:27:36 -0700 | [diff] [blame] | 1356 | /* No rcu protection needed here devices |
| 1357 | * can only be removed when no resync is |
| 1358 | * active, and resync is currently active |
| 1359 | */ |
NeilBrown | 69382e8 | 2006-01-06 00:20:22 -0800 | [diff] [blame] | 1360 | rdev = conf->mirrors[d].rdev; |
| 1361 | if (sync_page_io(rdev->bdev, |
| 1362 | sect + rdev->data_offset, |
| 1363 | s<<9, |
| 1364 | bio->bi_io_vec[idx].bv_page, |
| 1365 | READ)) { |
| 1366 | success = 1; |
| 1367 | break; |
| 1368 | } |
| 1369 | } |
| 1370 | d++; |
| 1371 | if (d == conf->raid_disks) |
| 1372 | d = 0; |
| 1373 | } while (!success && d != r1_bio->read_disk); |
| 1374 | |
| 1375 | if (success) { |
NeilBrown | 097426f | 2006-01-06 00:20:37 -0800 | [diff] [blame] | 1376 | int start = d; |
NeilBrown | 69382e8 | 2006-01-06 00:20:22 -0800 | [diff] [blame] | 1377 | /* write it back and re-read */ |
| 1378 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
| 1379 | while (d != r1_bio->read_disk) { |
| 1380 | if (d == 0) |
| 1381 | d = conf->raid_disks; |
| 1382 | d--; |
| 1383 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) |
| 1384 | continue; |
| 1385 | rdev = conf->mirrors[d].rdev; |
NeilBrown | 4dbcdc7 | 2006-01-06 00:20:52 -0800 | [diff] [blame] | 1386 | atomic_add(s, &rdev->corrected_errors); |
NeilBrown | 69382e8 | 2006-01-06 00:20:22 -0800 | [diff] [blame] | 1387 | if (sync_page_io(rdev->bdev, |
| 1388 | sect + rdev->data_offset, |
| 1389 | s<<9, |
| 1390 | bio->bi_io_vec[idx].bv_page, |
NeilBrown | 097426f | 2006-01-06 00:20:37 -0800 | [diff] [blame] | 1391 | WRITE) == 0) |
| 1392 | md_error(mddev, rdev); |
| 1393 | } |
| 1394 | d = start; |
| 1395 | while (d != r1_bio->read_disk) { |
| 1396 | if (d == 0) |
| 1397 | d = conf->raid_disks; |
| 1398 | d--; |
| 1399 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) |
| 1400 | continue; |
| 1401 | rdev = conf->mirrors[d].rdev; |
| 1402 | if (sync_page_io(rdev->bdev, |
NeilBrown | 69382e8 | 2006-01-06 00:20:22 -0800 | [diff] [blame] | 1403 | sect + rdev->data_offset, |
| 1404 | s<<9, |
| 1405 | bio->bi_io_vec[idx].bv_page, |
NeilBrown | 097426f | 2006-01-06 00:20:37 -0800 | [diff] [blame] | 1406 | READ) == 0) |
NeilBrown | 69382e8 | 2006-01-06 00:20:22 -0800 | [diff] [blame] | 1407 | md_error(mddev, rdev); |
NeilBrown | 69382e8 | 2006-01-06 00:20:22 -0800 | [diff] [blame] | 1408 | } |
| 1409 | } else { |
| 1410 | char b[BDEVNAME_SIZE]; |
| 1411 | /* Cannot read from anywhere, array is toast */ |
| 1412 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); |
| 1413 | printk(KERN_ALERT "raid1: %s: unrecoverable I/O read error" |
| 1414 | " for block %llu\n", |
| 1415 | bdevname(bio->bi_bdev,b), |
| 1416 | (unsigned long long)r1_bio->sector); |
| 1417 | md_done_sync(mddev, r1_bio->sectors, 0); |
| 1418 | put_buf(r1_bio); |
| 1419 | return; |
| 1420 | } |
| 1421 | sectors -= s; |
| 1422 | sect += s; |
| 1423 | idx ++; |
| 1424 | } |
| 1425 | } |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1426 | |
| 1427 | /* |
| 1428 | * schedule writes |
| 1429 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | atomic_set(&r1_bio->remaining, 1); |
| 1431 | for (i = 0; i < disks ; i++) { |
| 1432 | wbio = r1_bio->bios[i]; |
NeilBrown | 3e198f7 | 2006-01-06 00:20:21 -0800 | [diff] [blame] | 1433 | if (wbio->bi_end_io == NULL || |
| 1434 | (wbio->bi_end_io == end_sync_read && |
| 1435 | (i == r1_bio->read_disk || |
| 1436 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | continue; |
| 1438 | |
NeilBrown | 3e198f7 | 2006-01-06 00:20:21 -0800 | [diff] [blame] | 1439 | wbio->bi_rw = WRITE; |
| 1440 | wbio->bi_end_io = end_sync_write; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | atomic_inc(&r1_bio->remaining); |
| 1442 | md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1443 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | generic_make_request(wbio); |
| 1445 | } |
| 1446 | |
| 1447 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1448 | /* if we're here, all write(s) have completed, so clean up */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | md_done_sync(mddev, r1_bio->sectors, 1); |
| 1450 | put_buf(r1_bio); |
| 1451 | } |
| 1452 | } |
| 1453 | |
| 1454 | /* |
| 1455 | * This is a kernel thread which: |
| 1456 | * |
| 1457 | * 1. Retries failed read operations on working mirrors. |
| 1458 | * 2. Updates the raid superblock when problems encounter. |
| 1459 | * 3. Performs writes following reads for array syncronising. |
| 1460 | */ |
| 1461 | |
NeilBrown | 867868f | 2006-10-03 01:15:51 -0700 | [diff] [blame] | 1462 | static void fix_read_error(conf_t *conf, int read_disk, |
| 1463 | sector_t sect, int sectors) |
| 1464 | { |
| 1465 | mddev_t *mddev = conf->mddev; |
| 1466 | while(sectors) { |
| 1467 | int s = sectors; |
| 1468 | int d = read_disk; |
| 1469 | int success = 0; |
| 1470 | int start; |
| 1471 | mdk_rdev_t *rdev; |
| 1472 | |
| 1473 | if (s > (PAGE_SIZE>>9)) |
| 1474 | s = PAGE_SIZE >> 9; |
| 1475 | |
| 1476 | do { |
| 1477 | /* Note: no rcu protection needed here |
| 1478 | * as this is synchronous in the raid1d thread |
| 1479 | * which is the thread that might remove |
| 1480 | * a device. If raid1d ever becomes multi-threaded.... |
| 1481 | */ |
| 1482 | rdev = conf->mirrors[d].rdev; |
| 1483 | if (rdev && |
| 1484 | test_bit(In_sync, &rdev->flags) && |
| 1485 | sync_page_io(rdev->bdev, |
| 1486 | sect + rdev->data_offset, |
| 1487 | s<<9, |
| 1488 | conf->tmppage, READ)) |
| 1489 | success = 1; |
| 1490 | else { |
| 1491 | d++; |
| 1492 | if (d == conf->raid_disks) |
| 1493 | d = 0; |
| 1494 | } |
| 1495 | } while (!success && d != read_disk); |
| 1496 | |
| 1497 | if (!success) { |
| 1498 | /* Cannot read from anywhere -- bye bye array */ |
| 1499 | md_error(mddev, conf->mirrors[read_disk].rdev); |
| 1500 | break; |
| 1501 | } |
| 1502 | /* write it back and re-read */ |
| 1503 | start = d; |
| 1504 | while (d != read_disk) { |
| 1505 | if (d==0) |
| 1506 | d = conf->raid_disks; |
| 1507 | d--; |
| 1508 | rdev = conf->mirrors[d].rdev; |
| 1509 | if (rdev && |
| 1510 | test_bit(In_sync, &rdev->flags)) { |
| 1511 | if (sync_page_io(rdev->bdev, |
| 1512 | sect + rdev->data_offset, |
| 1513 | s<<9, conf->tmppage, WRITE) |
| 1514 | == 0) |
| 1515 | /* Well, this device is dead */ |
| 1516 | md_error(mddev, rdev); |
| 1517 | } |
| 1518 | } |
| 1519 | d = start; |
| 1520 | while (d != read_disk) { |
| 1521 | char b[BDEVNAME_SIZE]; |
| 1522 | if (d==0) |
| 1523 | d = conf->raid_disks; |
| 1524 | d--; |
| 1525 | rdev = conf->mirrors[d].rdev; |
| 1526 | if (rdev && |
| 1527 | test_bit(In_sync, &rdev->flags)) { |
| 1528 | if (sync_page_io(rdev->bdev, |
| 1529 | sect + rdev->data_offset, |
| 1530 | s<<9, conf->tmppage, READ) |
| 1531 | == 0) |
| 1532 | /* Well, this device is dead */ |
| 1533 | md_error(mddev, rdev); |
| 1534 | else { |
| 1535 | atomic_add(s, &rdev->corrected_errors); |
| 1536 | printk(KERN_INFO |
| 1537 | "raid1:%s: read error corrected " |
| 1538 | "(%d sectors at %llu on %s)\n", |
| 1539 | mdname(mddev), s, |
Randy Dunlap | 969b755 | 2006-10-28 10:38:32 -0700 | [diff] [blame] | 1540 | (unsigned long long)(sect + |
| 1541 | rdev->data_offset), |
NeilBrown | 867868f | 2006-10-03 01:15:51 -0700 | [diff] [blame] | 1542 | bdevname(rdev->bdev, b)); |
| 1543 | } |
| 1544 | } |
| 1545 | } |
| 1546 | sectors -= s; |
| 1547 | sect += s; |
| 1548 | } |
| 1549 | } |
| 1550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | static void raid1d(mddev_t *mddev) |
| 1552 | { |
| 1553 | r1bio_t *r1_bio; |
| 1554 | struct bio *bio; |
| 1555 | unsigned long flags; |
| 1556 | conf_t *conf = mddev_to_conf(mddev); |
| 1557 | struct list_head *head = &conf->retry_list; |
| 1558 | int unplug=0; |
| 1559 | mdk_rdev_t *rdev; |
| 1560 | |
| 1561 | md_check_recovery(mddev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | |
| 1563 | for (;;) { |
| 1564 | char b[BDEVNAME_SIZE]; |
NeilBrown | a35e63e | 2008-03-04 14:29:29 -0800 | [diff] [blame] | 1565 | |
| 1566 | unplug += flush_pending_writes(conf); |
| 1567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | spin_lock_irqsave(&conf->device_lock, flags); |
NeilBrown | a35e63e | 2008-03-04 14:29:29 -0800 | [diff] [blame] | 1569 | if (list_empty(head)) { |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1570 | spin_unlock_irqrestore(&conf->device_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | break; |
NeilBrown | a35e63e | 2008-03-04 14:29:29 -0800 | [diff] [blame] | 1572 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | r1_bio = list_entry(head->prev, r1bio_t, retry_list); |
| 1574 | list_del(head->prev); |
NeilBrown | ddaf22a | 2006-01-06 00:20:19 -0800 | [diff] [blame] | 1575 | conf->nr_queued--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | spin_unlock_irqrestore(&conf->device_lock, flags); |
| 1577 | |
| 1578 | mddev = r1_bio->mddev; |
| 1579 | conf = mddev_to_conf(mddev); |
| 1580 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
| 1581 | sync_request_write(mddev, r1_bio); |
| 1582 | unplug = 1; |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 1583 | } else if (test_bit(R1BIO_BarrierRetry, &r1_bio->state)) { |
| 1584 | /* some requests in the r1bio were BIO_RW_BARRIER |
NeilBrown | bea2771 | 2006-05-01 12:15:46 -0700 | [diff] [blame] | 1585 | * requests which failed with -EOPNOTSUPP. Hohumm.. |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 1586 | * Better resubmit without the barrier. |
| 1587 | * We know which devices to resubmit for, because |
| 1588 | * all others have had their bios[] entry cleared. |
NeilBrown | 5e7dd2a | 2006-05-01 12:15:47 -0700 | [diff] [blame] | 1589 | * We already have a nr_pending reference on these rdevs. |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 1590 | */ |
| 1591 | int i; |
Lars Ellenberg | e3881a6 | 2007-01-10 23:15:37 -0800 | [diff] [blame] | 1592 | const int do_sync = bio_sync(r1_bio->master_bio); |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 1593 | clear_bit(R1BIO_BarrierRetry, &r1_bio->state); |
| 1594 | clear_bit(R1BIO_Barrier, &r1_bio->state); |
| 1595 | for (i=0; i < conf->raid_disks; i++) |
NeilBrown | 2f88912 | 2006-03-27 01:18:19 -0800 | [diff] [blame] | 1596 | if (r1_bio->bios[i]) |
| 1597 | atomic_inc(&r1_bio->remaining); |
| 1598 | for (i=0; i < conf->raid_disks; i++) |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 1599 | if (r1_bio->bios[i]) { |
| 1600 | struct bio_vec *bvec; |
| 1601 | int j; |
| 1602 | |
| 1603 | bio = bio_clone(r1_bio->master_bio, GFP_NOIO); |
| 1604 | /* copy pages from the failed bio, as |
| 1605 | * this might be a write-behind device */ |
| 1606 | __bio_for_each_segment(bvec, bio, j, 0) |
| 1607 | bvec->bv_page = bio_iovec_idx(r1_bio->bios[i], j)->bv_page; |
| 1608 | bio_put(r1_bio->bios[i]); |
| 1609 | bio->bi_sector = r1_bio->sector + |
| 1610 | conf->mirrors[i].rdev->data_offset; |
| 1611 | bio->bi_bdev = conf->mirrors[i].rdev->bdev; |
| 1612 | bio->bi_end_io = raid1_end_write_request; |
Lars Ellenberg | e3881a6 | 2007-01-10 23:15:37 -0800 | [diff] [blame] | 1613 | bio->bi_rw = WRITE | do_sync; |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 1614 | bio->bi_private = r1_bio; |
| 1615 | r1_bio->bios[i] = bio; |
| 1616 | generic_make_request(bio); |
| 1617 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | } else { |
| 1619 | int disk; |
NeilBrown | ddaf22a | 2006-01-06 00:20:19 -0800 | [diff] [blame] | 1620 | |
| 1621 | /* we got a read error. Maybe the drive is bad. Maybe just |
| 1622 | * the block and we can fix it. |
| 1623 | * We freeze all other IO, and try reading the block from |
| 1624 | * other devices. When we find one, we re-write |
| 1625 | * and check it that fixes the read error. |
| 1626 | * This is all done synchronously while the array is |
| 1627 | * frozen |
| 1628 | */ |
NeilBrown | 867868f | 2006-10-03 01:15:51 -0700 | [diff] [blame] | 1629 | if (mddev->ro == 0) { |
| 1630 | freeze_array(conf); |
| 1631 | fix_read_error(conf, r1_bio->read_disk, |
| 1632 | r1_bio->sector, |
| 1633 | r1_bio->sectors); |
| 1634 | unfreeze_array(conf); |
NeilBrown | ddaf22a | 2006-01-06 00:20:19 -0800 | [diff] [blame] | 1635 | } |
| 1636 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | bio = r1_bio->bios[r1_bio->read_disk]; |
| 1638 | if ((disk=read_balance(conf, r1_bio)) == -1) { |
| 1639 | printk(KERN_ALERT "raid1: %s: unrecoverable I/O" |
| 1640 | " read error for block %llu\n", |
| 1641 | bdevname(bio->bi_bdev,b), |
| 1642 | (unsigned long long)r1_bio->sector); |
| 1643 | raid_end_bio_io(r1_bio); |
| 1644 | } else { |
Lars Ellenberg | e3881a6 | 2007-01-10 23:15:37 -0800 | [diff] [blame] | 1645 | const int do_sync = bio_sync(r1_bio->master_bio); |
NeilBrown | cf30a47 | 2006-01-06 00:20:23 -0800 | [diff] [blame] | 1646 | r1_bio->bios[r1_bio->read_disk] = |
| 1647 | mddev->ro ? IO_BLOCKED : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | r1_bio->read_disk = disk; |
| 1649 | bio_put(bio); |
| 1650 | bio = bio_clone(r1_bio->master_bio, GFP_NOIO); |
| 1651 | r1_bio->bios[r1_bio->read_disk] = bio; |
| 1652 | rdev = conf->mirrors[disk].rdev; |
| 1653 | if (printk_ratelimit()) |
| 1654 | printk(KERN_ERR "raid1: %s: redirecting sector %llu to" |
| 1655 | " another mirror\n", |
| 1656 | bdevname(rdev->bdev,b), |
| 1657 | (unsigned long long)r1_bio->sector); |
| 1658 | bio->bi_sector = r1_bio->sector + rdev->data_offset; |
| 1659 | bio->bi_bdev = rdev->bdev; |
| 1660 | bio->bi_end_io = raid1_end_read_request; |
Lars Ellenberg | e3881a6 | 2007-01-10 23:15:37 -0800 | [diff] [blame] | 1661 | bio->bi_rw = READ | do_sync; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | bio->bi_private = r1_bio; |
| 1663 | unplug = 1; |
| 1664 | generic_make_request(bio); |
| 1665 | } |
| 1666 | } |
| 1667 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | if (unplug) |
| 1669 | unplug_slaves(mddev); |
| 1670 | } |
| 1671 | |
| 1672 | |
| 1673 | static int init_resync(conf_t *conf) |
| 1674 | { |
| 1675 | int buffs; |
| 1676 | |
| 1677 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; |
Eric Sesterhenn | 9e77c48 | 2006-04-01 01:08:49 +0200 | [diff] [blame] | 1678 | BUG_ON(conf->r1buf_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
| 1680 | conf->poolinfo); |
| 1681 | if (!conf->r1buf_pool) |
| 1682 | return -ENOMEM; |
| 1683 | conf->next_resync = 0; |
| 1684 | return 0; |
| 1685 | } |
| 1686 | |
| 1687 | /* |
| 1688 | * perform a "sync" on one "block" |
| 1689 | * |
| 1690 | * We need to make sure that no normal I/O request - particularly write |
| 1691 | * requests - conflict with active sync requests. |
| 1692 | * |
| 1693 | * This is achieved by tracking pending requests and a 'barrier' concept |
| 1694 | * that can be installed to exclude normal IO requests. |
| 1695 | */ |
| 1696 | |
NeilBrown | 57afd89 | 2005-06-21 17:17:13 -0700 | [diff] [blame] | 1697 | static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | { |
| 1699 | conf_t *conf = mddev_to_conf(mddev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | r1bio_t *r1_bio; |
| 1701 | struct bio *bio; |
| 1702 | sector_t max_sector, nr_sectors; |
NeilBrown | 3e198f7 | 2006-01-06 00:20:21 -0800 | [diff] [blame] | 1703 | int disk = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | int i; |
NeilBrown | 3e198f7 | 2006-01-06 00:20:21 -0800 | [diff] [blame] | 1705 | int wonly = -1; |
| 1706 | int write_targets = 0, read_targets = 0; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1707 | int sync_blocks; |
NeilBrown | e3b9703 | 2005-08-04 12:53:34 -0700 | [diff] [blame] | 1708 | int still_degraded = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | |
| 1710 | if (!conf->r1buf_pool) |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1711 | { |
| 1712 | /* |
| 1713 | printk("sync start - bitmap %p\n", mddev->bitmap); |
| 1714 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | if (init_resync(conf)) |
NeilBrown | 57afd89 | 2005-06-21 17:17:13 -0700 | [diff] [blame] | 1716 | return 0; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1717 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | |
| 1719 | max_sector = mddev->size << 1; |
| 1720 | if (sector_nr >= max_sector) { |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1721 | /* If we aborted, we need to abort the |
| 1722 | * sync on the 'current' bitmap chunk (there will |
| 1723 | * only be one in raid1 resync. |
| 1724 | * We can find the current addess in mddev->curr_resync |
| 1725 | */ |
NeilBrown | 6a806c5 | 2005-07-15 03:56:35 -0700 | [diff] [blame] | 1726 | if (mddev->curr_resync < max_sector) /* aborted */ |
| 1727 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1728 | &sync_blocks, 1); |
NeilBrown | 6a806c5 | 2005-07-15 03:56:35 -0700 | [diff] [blame] | 1729 | else /* completed sync */ |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1730 | conf->fullsync = 0; |
NeilBrown | 6a806c5 | 2005-07-15 03:56:35 -0700 | [diff] [blame] | 1731 | |
| 1732 | bitmap_close_sync(mddev->bitmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | close_sync(conf); |
| 1734 | return 0; |
| 1735 | } |
| 1736 | |
NeilBrown | 07d84d10 | 2006-06-26 00:27:56 -0700 | [diff] [blame] | 1737 | if (mddev->bitmap == NULL && |
| 1738 | mddev->recovery_cp == MaxSector && |
NeilBrown | 6394cca | 2006-08-27 01:23:50 -0700 | [diff] [blame] | 1739 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
NeilBrown | 07d84d10 | 2006-06-26 00:27:56 -0700 | [diff] [blame] | 1740 | conf->fullsync == 0) { |
| 1741 | *skipped = 1; |
| 1742 | return max_sector - sector_nr; |
| 1743 | } |
NeilBrown | 6394cca | 2006-08-27 01:23:50 -0700 | [diff] [blame] | 1744 | /* before building a request, check if we can skip these blocks.. |
| 1745 | * This call the bitmap_start_sync doesn't actually record anything |
| 1746 | */ |
NeilBrown | e3b9703 | 2005-08-04 12:53:34 -0700 | [diff] [blame] | 1747 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
NeilBrown | e5de485 | 2005-11-08 21:39:38 -0800 | [diff] [blame] | 1748 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1749 | /* We can skip this block, and probably several more */ |
| 1750 | *skipped = 1; |
| 1751 | return sync_blocks; |
| 1752 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | /* |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 1754 | * If there is non-resync activity waiting for a turn, |
| 1755 | * and resync is going fast enough, |
| 1756 | * then let it though before starting on this new sync request. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | */ |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 1758 | if (!go_faster && conf->nr_waiting) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | msleep_interruptible(1000); |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 1760 | |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1761 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 1762 | raise_barrier(conf); |
| 1763 | |
| 1764 | conf->next_resync = sector_nr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1765 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
NeilBrown | 3e198f7 | 2006-01-06 00:20:21 -0800 | [diff] [blame] | 1767 | rcu_read_lock(); |
| 1768 | /* |
| 1769 | * If we get a correctably read error during resync or recovery, |
| 1770 | * we might want to read from a different device. So we |
| 1771 | * flag all drives that could conceivably be read from for READ, |
| 1772 | * and any others (which will be non-In_sync devices) for WRITE. |
| 1773 | * If a read fails, we try reading from something else for which READ |
| 1774 | * is OK. |
| 1775 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | r1_bio->mddev = mddev; |
| 1778 | r1_bio->sector = sector_nr; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1779 | r1_bio->state = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | set_bit(R1BIO_IsSync, &r1_bio->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1781 | |
| 1782 | for (i=0; i < conf->raid_disks; i++) { |
NeilBrown | 3e198f7 | 2006-01-06 00:20:21 -0800 | [diff] [blame] | 1783 | mdk_rdev_t *rdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | bio = r1_bio->bios[i]; |
| 1785 | |
| 1786 | /* take from bio_init */ |
| 1787 | bio->bi_next = NULL; |
| 1788 | bio->bi_flags |= 1 << BIO_UPTODATE; |
NeilBrown | 802ba06 | 2006-12-13 00:34:13 -0800 | [diff] [blame] | 1789 | bio->bi_rw = READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | bio->bi_vcnt = 0; |
| 1791 | bio->bi_idx = 0; |
| 1792 | bio->bi_phys_segments = 0; |
| 1793 | bio->bi_hw_segments = 0; |
| 1794 | bio->bi_size = 0; |
| 1795 | bio->bi_end_io = NULL; |
| 1796 | bio->bi_private = NULL; |
| 1797 | |
NeilBrown | 3e198f7 | 2006-01-06 00:20:21 -0800 | [diff] [blame] | 1798 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
| 1799 | if (rdev == NULL || |
| 1800 | test_bit(Faulty, &rdev->flags)) { |
NeilBrown | e3b9703 | 2005-08-04 12:53:34 -0700 | [diff] [blame] | 1801 | still_degraded = 1; |
| 1802 | continue; |
NeilBrown | 3e198f7 | 2006-01-06 00:20:21 -0800 | [diff] [blame] | 1803 | } else if (!test_bit(In_sync, &rdev->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | bio->bi_rw = WRITE; |
| 1805 | bio->bi_end_io = end_sync_write; |
| 1806 | write_targets ++; |
NeilBrown | 3e198f7 | 2006-01-06 00:20:21 -0800 | [diff] [blame] | 1807 | } else { |
| 1808 | /* may need to read from here */ |
| 1809 | bio->bi_rw = READ; |
| 1810 | bio->bi_end_io = end_sync_read; |
| 1811 | if (test_bit(WriteMostly, &rdev->flags)) { |
| 1812 | if (wonly < 0) |
| 1813 | wonly = i; |
| 1814 | } else { |
| 1815 | if (disk < 0) |
| 1816 | disk = i; |
| 1817 | } |
| 1818 | read_targets++; |
| 1819 | } |
| 1820 | atomic_inc(&rdev->nr_pending); |
| 1821 | bio->bi_sector = sector_nr + rdev->data_offset; |
| 1822 | bio->bi_bdev = rdev->bdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | bio->bi_private = r1_bio; |
| 1824 | } |
NeilBrown | 3e198f7 | 2006-01-06 00:20:21 -0800 | [diff] [blame] | 1825 | rcu_read_unlock(); |
| 1826 | if (disk < 0) |
| 1827 | disk = wonly; |
| 1828 | r1_bio->read_disk = disk; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1829 | |
NeilBrown | 3e198f7 | 2006-01-06 00:20:21 -0800 | [diff] [blame] | 1830 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
| 1831 | /* extra read targets are also write targets */ |
| 1832 | write_targets += read_targets-1; |
| 1833 | |
| 1834 | if (write_targets == 0 || read_targets == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | /* There is nowhere to write, so all non-sync |
| 1836 | * drives must be failed - so we are finished |
| 1837 | */ |
NeilBrown | 57afd89 | 2005-06-21 17:17:13 -0700 | [diff] [blame] | 1838 | sector_t rv = max_sector - sector_nr; |
| 1839 | *skipped = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | put_buf(r1_bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | return rv; |
| 1842 | } |
| 1843 | |
NeilBrown | c620727 | 2008-02-06 01:39:52 -0800 | [diff] [blame] | 1844 | if (max_sector > mddev->resync_max) |
| 1845 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1846 | nr_sectors = 0; |
NeilBrown | 289e99e | 2005-06-21 17:17:24 -0700 | [diff] [blame] | 1847 | sync_blocks = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1848 | do { |
| 1849 | struct page *page; |
| 1850 | int len = PAGE_SIZE; |
| 1851 | if (sector_nr + (len>>9) > max_sector) |
| 1852 | len = (max_sector - sector_nr) << 9; |
| 1853 | if (len == 0) |
| 1854 | break; |
NeilBrown | 6a806c5 | 2005-07-15 03:56:35 -0700 | [diff] [blame] | 1855 | if (sync_blocks == 0) { |
| 1856 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, |
NeilBrown | e5de485 | 2005-11-08 21:39:38 -0800 | [diff] [blame] | 1857 | &sync_blocks, still_degraded) && |
| 1858 | !conf->fullsync && |
| 1859 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
NeilBrown | 6a806c5 | 2005-07-15 03:56:35 -0700 | [diff] [blame] | 1860 | break; |
Eric Sesterhenn | 9e77c48 | 2006-04-01 01:08:49 +0200 | [diff] [blame] | 1861 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
NeilBrown | 6a806c5 | 2005-07-15 03:56:35 -0700 | [diff] [blame] | 1862 | if (len > (sync_blocks<<9)) |
| 1863 | len = sync_blocks<<9; |
NeilBrown | ab7a30c | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1864 | } |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1865 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | for (i=0 ; i < conf->raid_disks; i++) { |
| 1867 | bio = r1_bio->bios[i]; |
| 1868 | if (bio->bi_end_io) { |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1869 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1870 | if (bio_add_page(bio, page, len, 0) == 0) { |
| 1871 | /* stop here */ |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1872 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | while (i > 0) { |
| 1874 | i--; |
| 1875 | bio = r1_bio->bios[i]; |
NeilBrown | 6a806c5 | 2005-07-15 03:56:35 -0700 | [diff] [blame] | 1876 | if (bio->bi_end_io==NULL) |
| 1877 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | /* remove last page from this bio */ |
| 1879 | bio->bi_vcnt--; |
| 1880 | bio->bi_size -= len; |
| 1881 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); |
| 1882 | } |
| 1883 | goto bio_full; |
| 1884 | } |
| 1885 | } |
| 1886 | } |
| 1887 | nr_sectors += len>>9; |
| 1888 | sector_nr += len>>9; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1889 | sync_blocks -= (len>>9); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
| 1891 | bio_full: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | r1_bio->sectors = nr_sectors; |
| 1893 | |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1894 | /* For a user-requested sync, we read all readable devices and do a |
| 1895 | * compare |
| 1896 | */ |
| 1897 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
| 1898 | atomic_set(&r1_bio->remaining, read_targets); |
| 1899 | for (i=0; i<conf->raid_disks; i++) { |
| 1900 | bio = r1_bio->bios[i]; |
| 1901 | if (bio->bi_end_io == end_sync_read) { |
NeilBrown | ddac7c7 | 2006-08-31 21:27:36 -0700 | [diff] [blame] | 1902 | md_sync_acct(bio->bi_bdev, nr_sectors); |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1903 | generic_make_request(bio); |
| 1904 | } |
| 1905 | } |
| 1906 | } else { |
| 1907 | atomic_set(&r1_bio->remaining, 1); |
| 1908 | bio = r1_bio->bios[r1_bio->read_disk]; |
NeilBrown | ddac7c7 | 2006-08-31 21:27:36 -0700 | [diff] [blame] | 1909 | md_sync_acct(bio->bi_bdev, nr_sectors); |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1910 | generic_make_request(bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | |
NeilBrown | d11c171 | 2006-01-06 00:20:26 -0800 | [diff] [blame] | 1912 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | return nr_sectors; |
| 1914 | } |
| 1915 | |
| 1916 | static int run(mddev_t *mddev) |
| 1917 | { |
| 1918 | conf_t *conf; |
| 1919 | int i, j, disk_idx; |
| 1920 | mirror_info_t *disk; |
| 1921 | mdk_rdev_t *rdev; |
| 1922 | struct list_head *tmp; |
| 1923 | |
| 1924 | if (mddev->level != 1) { |
| 1925 | printk("raid1: %s: raid level not set to mirroring (%d)\n", |
| 1926 | mdname(mddev), mddev->level); |
| 1927 | goto out; |
| 1928 | } |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 1929 | if (mddev->reshape_position != MaxSector) { |
| 1930 | printk("raid1: %s: reshape_position set but not supported\n", |
| 1931 | mdname(mddev)); |
| 1932 | goto out; |
| 1933 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | /* |
| 1935 | * copy the already verified devices into our private RAID1 |
| 1936 | * bookkeeping area. [whatever we allocate in run(), |
| 1937 | * should be freed in stop()] |
| 1938 | */ |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 1939 | conf = kzalloc(sizeof(conf_t), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1940 | mddev->private = conf; |
| 1941 | if (!conf) |
| 1942 | goto out_no_mem; |
| 1943 | |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 1944 | conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | GFP_KERNEL); |
| 1946 | if (!conf->mirrors) |
| 1947 | goto out_no_mem; |
| 1948 | |
NeilBrown | ddaf22a | 2006-01-06 00:20:19 -0800 | [diff] [blame] | 1949 | conf->tmppage = alloc_page(GFP_KERNEL); |
| 1950 | if (!conf->tmppage) |
| 1951 | goto out_no_mem; |
| 1952 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | conf->poolinfo = kmalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
| 1954 | if (!conf->poolinfo) |
| 1955 | goto out_no_mem; |
| 1956 | conf->poolinfo->mddev = mddev; |
| 1957 | conf->poolinfo->raid_disks = mddev->raid_disks; |
| 1958 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, |
| 1959 | r1bio_pool_free, |
| 1960 | conf->poolinfo); |
| 1961 | if (!conf->r1bio_pool) |
| 1962 | goto out_no_mem; |
| 1963 | |
Neil Brown | e7e72bf | 2008-05-14 16:05:54 -0700 | [diff] [blame] | 1964 | spin_lock_init(&conf->device_lock); |
| 1965 | mddev->queue->queue_lock = &conf->device_lock; |
| 1966 | |
NeilBrown | d089c6a | 2008-02-06 01:39:59 -0800 | [diff] [blame] | 1967 | rdev_for_each(rdev, tmp, mddev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | disk_idx = rdev->raid_disk; |
| 1969 | if (disk_idx >= mddev->raid_disks |
| 1970 | || disk_idx < 0) |
| 1971 | continue; |
| 1972 | disk = conf->mirrors + disk_idx; |
| 1973 | |
| 1974 | disk->rdev = rdev; |
| 1975 | |
| 1976 | blk_queue_stack_limits(mddev->queue, |
| 1977 | rdev->bdev->bd_disk->queue); |
| 1978 | /* as we don't honour merge_bvec_fn, we must never risk |
| 1979 | * violating it, so limit ->max_sector to one PAGE, as |
| 1980 | * a one page request is never in violation. |
| 1981 | */ |
| 1982 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn && |
| 1983 | mddev->queue->max_sectors > (PAGE_SIZE>>9)) |
| 1984 | blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); |
| 1985 | |
| 1986 | disk->head_position = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | } |
| 1988 | conf->raid_disks = mddev->raid_disks; |
| 1989 | conf->mddev = mddev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | INIT_LIST_HEAD(&conf->retry_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | |
| 1992 | spin_lock_init(&conf->resync_lock); |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 1993 | init_waitqueue_head(&conf->wait_barrier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 1995 | bio_list_init(&conf->pending_bio_list); |
| 1996 | bio_list_init(&conf->flushing_bio_list); |
| 1997 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1998 | |
| 1999 | mddev->degraded = 0; |
| 2000 | for (i = 0; i < conf->raid_disks; i++) { |
| 2001 | |
| 2002 | disk = conf->mirrors + i; |
| 2003 | |
NeilBrown | 5fd6c1d | 2006-06-26 00:27:40 -0700 | [diff] [blame] | 2004 | if (!disk->rdev || |
| 2005 | !test_bit(In_sync, &disk->rdev->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | disk->head_position = 0; |
| 2007 | mddev->degraded++; |
NeilBrown | 918f023 | 2007-08-22 14:01:52 -0700 | [diff] [blame] | 2008 | if (disk->rdev) |
| 2009 | conf->fullsync = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | } |
| 2011 | } |
NeilBrown | 11ce99e | 2006-10-03 01:15:52 -0700 | [diff] [blame] | 2012 | if (mddev->degraded == conf->raid_disks) { |
| 2013 | printk(KERN_ERR "raid1: no operational mirrors for %s\n", |
| 2014 | mdname(mddev)); |
| 2015 | goto out_free_conf; |
| 2016 | } |
| 2017 | if (conf->raid_disks - mddev->degraded == 1) |
| 2018 | mddev->recovery_cp = MaxSector; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | |
| 2020 | /* |
| 2021 | * find the first working one and use it as a starting point |
| 2022 | * to read balancing. |
| 2023 | */ |
| 2024 | for (j = 0; j < conf->raid_disks && |
| 2025 | (!conf->mirrors[j].rdev || |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 2026 | !test_bit(In_sync, &conf->mirrors[j].rdev->flags)) ; j++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | /* nothing */; |
| 2028 | conf->last_used = j; |
| 2029 | |
| 2030 | |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 2031 | mddev->thread = md_register_thread(raid1d, mddev, "%s_raid1"); |
| 2032 | if (!mddev->thread) { |
| 2033 | printk(KERN_ERR |
| 2034 | "raid1: couldn't allocate thread for %s\n", |
| 2035 | mdname(mddev)); |
| 2036 | goto out_free_conf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | } |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 2038 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | printk(KERN_INFO |
| 2040 | "raid1: raid set %s active with %d out of %d mirrors\n", |
| 2041 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
| 2042 | mddev->raid_disks); |
| 2043 | /* |
| 2044 | * Ok, everything is just fine now |
| 2045 | */ |
| 2046 | mddev->array_size = mddev->size; |
| 2047 | |
NeilBrown | 7a5febe | 2005-05-16 21:53:16 -0700 | [diff] [blame] | 2048 | mddev->queue->unplug_fn = raid1_unplug; |
NeilBrown | 0d12922 | 2006-10-03 01:15:54 -0700 | [diff] [blame] | 2049 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; |
| 2050 | mddev->queue->backing_dev_info.congested_data = mddev; |
NeilBrown | 7a5febe | 2005-05-16 21:53:16 -0700 | [diff] [blame] | 2051 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | return 0; |
| 2053 | |
| 2054 | out_no_mem: |
| 2055 | printk(KERN_ERR "raid1: couldn't allocate memory for %s\n", |
| 2056 | mdname(mddev)); |
| 2057 | |
| 2058 | out_free_conf: |
| 2059 | if (conf) { |
| 2060 | if (conf->r1bio_pool) |
| 2061 | mempool_destroy(conf->r1bio_pool); |
Jesper Juhl | 990a8ba | 2005-06-21 17:17:30 -0700 | [diff] [blame] | 2062 | kfree(conf->mirrors); |
NeilBrown | 1345b1d | 2006-01-06 00:20:40 -0800 | [diff] [blame] | 2063 | safe_put_page(conf->tmppage); |
Jesper Juhl | 990a8ba | 2005-06-21 17:17:30 -0700 | [diff] [blame] | 2064 | kfree(conf->poolinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | kfree(conf); |
| 2066 | mddev->private = NULL; |
| 2067 | } |
| 2068 | out: |
| 2069 | return -EIO; |
| 2070 | } |
| 2071 | |
| 2072 | static int stop(mddev_t *mddev) |
| 2073 | { |
| 2074 | conf_t *conf = mddev_to_conf(mddev); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 2075 | struct bitmap *bitmap = mddev->bitmap; |
| 2076 | int behind_wait = 0; |
| 2077 | |
| 2078 | /* wait for behind writes to complete */ |
| 2079 | while (bitmap && atomic_read(&bitmap->behind_writes) > 0) { |
| 2080 | behind_wait++; |
| 2081 | printk(KERN_INFO "raid1: behind writes in progress on device %s, waiting to stop (%d)\n", mdname(mddev), behind_wait); |
| 2082 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 2083 | schedule_timeout(HZ); /* wait a second */ |
| 2084 | /* need to kick something here to make sure I/O goes? */ |
| 2085 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2086 | |
| 2087 | md_unregister_thread(mddev->thread); |
| 2088 | mddev->thread = NULL; |
| 2089 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ |
| 2090 | if (conf->r1bio_pool) |
| 2091 | mempool_destroy(conf->r1bio_pool); |
Jesper Juhl | 990a8ba | 2005-06-21 17:17:30 -0700 | [diff] [blame] | 2092 | kfree(conf->mirrors); |
| 2093 | kfree(conf->poolinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | kfree(conf); |
| 2095 | mddev->private = NULL; |
| 2096 | return 0; |
| 2097 | } |
| 2098 | |
| 2099 | static int raid1_resize(mddev_t *mddev, sector_t sectors) |
| 2100 | { |
| 2101 | /* no resync is happening, and there is enough space |
| 2102 | * on all devices, so we can resize. |
| 2103 | * We need to make sure resync covers any new space. |
| 2104 | * If the array is shrinking we should possibly wait until |
| 2105 | * any io in the removed space completes, but it hardly seems |
| 2106 | * worth it. |
| 2107 | */ |
| 2108 | mddev->array_size = sectors>>1; |
| 2109 | set_capacity(mddev->gendisk, mddev->array_size << 1); |
Linus Torvalds | 44ce629 | 2007-05-09 18:51:36 -0700 | [diff] [blame] | 2110 | mddev->changed = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | if (mddev->array_size > mddev->size && mddev->recovery_cp == MaxSector) { |
| 2112 | mddev->recovery_cp = mddev->size << 1; |
| 2113 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 2114 | } |
| 2115 | mddev->size = mddev->array_size; |
NeilBrown | 4b5c7ae | 2005-07-27 11:43:28 -0700 | [diff] [blame] | 2116 | mddev->resync_max_sectors = sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | return 0; |
| 2118 | } |
| 2119 | |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 2120 | static int raid1_reshape(mddev_t *mddev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | { |
| 2122 | /* We need to: |
| 2123 | * 1/ resize the r1bio_pool |
| 2124 | * 2/ resize conf->mirrors |
| 2125 | * |
| 2126 | * We allocate a new r1bio_pool if we can. |
| 2127 | * Then raise a device barrier and wait until all IO stops. |
| 2128 | * Then resize conf->mirrors and swap in the new r1bio pool. |
NeilBrown | 6ea9c07 | 2005-06-21 17:17:09 -0700 | [diff] [blame] | 2129 | * |
| 2130 | * At the same time, we "pack" the devices so that all the missing |
| 2131 | * devices have the higher raid_disk numbers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | */ |
| 2133 | mempool_t *newpool, *oldpool; |
| 2134 | struct pool_info *newpoolinfo; |
| 2135 | mirror_info_t *newmirrors; |
| 2136 | conf_t *conf = mddev_to_conf(mddev); |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 2137 | int cnt, raid_disks; |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 2138 | unsigned long flags; |
NeilBrown | 6ea9c07 | 2005-06-21 17:17:09 -0700 | [diff] [blame] | 2139 | int d, d2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 2141 | /* Cannot change chunk_size, layout, or level */ |
| 2142 | if (mddev->chunk_size != mddev->new_chunk || |
| 2143 | mddev->layout != mddev->new_layout || |
| 2144 | mddev->level != mddev->new_level) { |
| 2145 | mddev->new_chunk = mddev->chunk_size; |
| 2146 | mddev->new_layout = mddev->layout; |
| 2147 | mddev->new_level = mddev->level; |
| 2148 | return -EINVAL; |
| 2149 | } |
| 2150 | |
NeilBrown | 2a2275d | 2007-01-26 00:57:11 -0800 | [diff] [blame] | 2151 | md_allow_write(mddev); |
| 2152 | |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 2153 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
| 2154 | |
NeilBrown | 6ea9c07 | 2005-06-21 17:17:09 -0700 | [diff] [blame] | 2155 | if (raid_disks < conf->raid_disks) { |
| 2156 | cnt=0; |
| 2157 | for (d= 0; d < conf->raid_disks; d++) |
| 2158 | if (conf->mirrors[d].rdev) |
| 2159 | cnt++; |
| 2160 | if (cnt > raid_disks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | return -EBUSY; |
NeilBrown | 6ea9c07 | 2005-06-21 17:17:09 -0700 | [diff] [blame] | 2162 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2163 | |
| 2164 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); |
| 2165 | if (!newpoolinfo) |
| 2166 | return -ENOMEM; |
| 2167 | newpoolinfo->mddev = mddev; |
| 2168 | newpoolinfo->raid_disks = raid_disks; |
| 2169 | |
| 2170 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, |
| 2171 | r1bio_pool_free, newpoolinfo); |
| 2172 | if (!newpool) { |
| 2173 | kfree(newpoolinfo); |
| 2174 | return -ENOMEM; |
| 2175 | } |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 2176 | newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | if (!newmirrors) { |
| 2178 | kfree(newpoolinfo); |
| 2179 | mempool_destroy(newpool); |
| 2180 | return -ENOMEM; |
| 2181 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 2183 | raise_barrier(conf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | |
| 2185 | /* ok, everything is stopped */ |
| 2186 | oldpool = conf->r1bio_pool; |
| 2187 | conf->r1bio_pool = newpool; |
NeilBrown | 6ea9c07 | 2005-06-21 17:17:09 -0700 | [diff] [blame] | 2188 | |
NeilBrown | a88aa78 | 2007-08-22 14:01:53 -0700 | [diff] [blame] | 2189 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
| 2190 | mdk_rdev_t *rdev = conf->mirrors[d].rdev; |
| 2191 | if (rdev && rdev->raid_disk != d2) { |
| 2192 | char nm[20]; |
| 2193 | sprintf(nm, "rd%d", rdev->raid_disk); |
| 2194 | sysfs_remove_link(&mddev->kobj, nm); |
| 2195 | rdev->raid_disk = d2; |
| 2196 | sprintf(nm, "rd%d", rdev->raid_disk); |
| 2197 | sysfs_remove_link(&mddev->kobj, nm); |
| 2198 | if (sysfs_create_link(&mddev->kobj, |
| 2199 | &rdev->kobj, nm)) |
| 2200 | printk(KERN_WARNING |
| 2201 | "md/raid1: cannot register " |
| 2202 | "%s for %s\n", |
| 2203 | nm, mdname(mddev)); |
NeilBrown | 6ea9c07 | 2005-06-21 17:17:09 -0700 | [diff] [blame] | 2204 | } |
NeilBrown | a88aa78 | 2007-08-22 14:01:53 -0700 | [diff] [blame] | 2205 | if (rdev) |
| 2206 | newmirrors[d2++].rdev = rdev; |
| 2207 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2208 | kfree(conf->mirrors); |
| 2209 | conf->mirrors = newmirrors; |
| 2210 | kfree(conf->poolinfo); |
| 2211 | conf->poolinfo = newpoolinfo; |
| 2212 | |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 2213 | spin_lock_irqsave(&conf->device_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2214 | mddev->degraded += (raid_disks - conf->raid_disks); |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 2215 | spin_unlock_irqrestore(&conf->device_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | conf->raid_disks = mddev->raid_disks = raid_disks; |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 2217 | mddev->delta_disks = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | |
NeilBrown | 6ea9c07 | 2005-06-21 17:17:09 -0700 | [diff] [blame] | 2219 | conf->last_used = 0; /* just make sure it is in-range */ |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 2220 | lower_barrier(conf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | |
| 2222 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 2223 | md_wakeup_thread(mddev->thread); |
| 2224 | |
| 2225 | mempool_destroy(oldpool); |
| 2226 | return 0; |
| 2227 | } |
| 2228 | |
NeilBrown | 500af87 | 2005-09-09 16:23:58 -0700 | [diff] [blame] | 2229 | static void raid1_quiesce(mddev_t *mddev, int state) |
NeilBrown | 36fa306 | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 2230 | { |
| 2231 | conf_t *conf = mddev_to_conf(mddev); |
| 2232 | |
| 2233 | switch(state) { |
NeilBrown | 9e6603d | 2005-09-09 16:23:48 -0700 | [diff] [blame] | 2234 | case 1: |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 2235 | raise_barrier(conf); |
NeilBrown | 36fa306 | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 2236 | break; |
NeilBrown | 9e6603d | 2005-09-09 16:23:48 -0700 | [diff] [blame] | 2237 | case 0: |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 2238 | lower_barrier(conf); |
NeilBrown | 36fa306 | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 2239 | break; |
| 2240 | } |
NeilBrown | 36fa306 | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 2241 | } |
| 2242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2243 | |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 2244 | static struct mdk_personality raid1_personality = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | { |
| 2246 | .name = "raid1", |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 2247 | .level = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | .owner = THIS_MODULE, |
| 2249 | .make_request = make_request, |
| 2250 | .run = run, |
| 2251 | .stop = stop, |
| 2252 | .status = status, |
| 2253 | .error_handler = error, |
| 2254 | .hot_add_disk = raid1_add_disk, |
| 2255 | .hot_remove_disk= raid1_remove_disk, |
| 2256 | .spare_active = raid1_spare_active, |
| 2257 | .sync_request = sync_request, |
| 2258 | .resize = raid1_resize, |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 2259 | .check_reshape = raid1_reshape, |
NeilBrown | 36fa306 | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 2260 | .quiesce = raid1_quiesce, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | }; |
| 2262 | |
| 2263 | static int __init raid_init(void) |
| 2264 | { |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 2265 | return register_md_personality(&raid1_personality); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | } |
| 2267 | |
| 2268 | static void raid_exit(void) |
| 2269 | { |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 2270 | unregister_md_personality(&raid1_personality); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | } |
| 2272 | |
| 2273 | module_init(raid_init); |
| 2274 | module_exit(raid_exit); |
| 2275 | MODULE_LICENSE("GPL"); |
| 2276 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
NeilBrown | d9d166c | 2006-01-06 00:20:51 -0800 | [diff] [blame] | 2277 | MODULE_ALIAS("md-raid1"); |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 2278 | MODULE_ALIAS("md-level-1"); |