Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * raid5.c : Multiple Devices driver for Linux |
| 3 | * Copyright (C) 1996, 1997 Ingo Molnar, Miguel de Icaza, Gadi Oxman |
| 4 | * Copyright (C) 1999, 2000 Ingo Molnar |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 5 | * Copyright (C) 2002, 2003 H. Peter Anvin |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 7 | * RAID-4/5/6 management functions. |
| 8 | * Thanks to Penguin Computing for making the RAID-6 development possible |
| 9 | * by donating a test server! |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2, or (at your option) |
| 14 | * any later version. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * (for example /usr/src/linux/COPYING); if not, write to the Free |
| 18 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 19 | */ |
| 20 | |
NeilBrown | ae3c20c | 2006-07-10 04:44:17 -0700 | [diff] [blame] | 21 | /* |
| 22 | * BITMAP UNPLUGGING: |
| 23 | * |
| 24 | * The sequencing for updating the bitmap reliably is a little |
| 25 | * subtle (and I got it wrong the first time) so it deserves some |
| 26 | * explanation. |
| 27 | * |
| 28 | * We group bitmap updates into batches. Each batch has a number. |
| 29 | * We may write out several batches at once, but that isn't very important. |
| 30 | * conf->bm_write is the number of the last batch successfully written. |
| 31 | * conf->bm_flush is the number of the last batch that was closed to |
| 32 | * new additions. |
| 33 | * When we discover that we will need to write to any block in a stripe |
| 34 | * (in add_stripe_bio) we update the in-memory bitmap and record in sh->bm_seq |
| 35 | * the number of the batch it will be in. This is bm_flush+1. |
| 36 | * When we are ready to do a write, if that batch hasn't been written yet, |
| 37 | * we plug the array and queue the stripe for later. |
| 38 | * When an unplug happens, we increment bm_flush, thus closing the current |
| 39 | * batch. |
| 40 | * When we notice that bm_flush > bm_write, we write out all pending updates |
| 41 | * to the bitmap, and advance bm_write to where bm_flush was. |
| 42 | * This may occasionally write a bit out twice, but is sure never to |
| 43 | * miss any bits. |
| 44 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/module.h> |
| 47 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <linux/highmem.h> |
| 49 | #include <linux/bitops.h> |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 50 | #include <linux/kthread.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <asm/atomic.h> |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 52 | #include "raid6.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 54 | #include <linux/raid/bitmap.h> |
| 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | /* |
| 57 | * Stripe cache |
| 58 | */ |
| 59 | |
| 60 | #define NR_STRIPES 256 |
| 61 | #define STRIPE_SIZE PAGE_SIZE |
| 62 | #define STRIPE_SHIFT (PAGE_SHIFT - 9) |
| 63 | #define STRIPE_SECTORS (STRIPE_SIZE>>9) |
| 64 | #define IO_THRESHOLD 1 |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 65 | #define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #define HASH_MASK (NR_HASH - 1) |
| 67 | |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 68 | #define stripe_hash(conf, sect) (&((conf)->stripe_hashtbl[((sect) >> STRIPE_SHIFT) & HASH_MASK])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
| 70 | /* bio's attached to a stripe+device for I/O are linked together in bi_sector |
| 71 | * order without overlap. There may be several bio's per stripe+device, and |
| 72 | * a bio could span several devices. |
| 73 | * When walking this list for a particular stripe+device, we must never proceed |
| 74 | * beyond a bio that extends past this device, as the next bio might no longer |
| 75 | * be valid. |
| 76 | * This macro is used to determine the 'next' bio in the list, given the sector |
| 77 | * of the current stripe+device |
| 78 | */ |
| 79 | #define r5_next_bio(bio, sect) ( ( (bio)->bi_sector + ((bio)->bi_size>>9) < sect + STRIPE_SECTORS) ? (bio)->bi_next : NULL) |
| 80 | /* |
| 81 | * The following can be used to debug the driver |
| 82 | */ |
| 83 | #define RAID5_DEBUG 0 |
| 84 | #define RAID5_PARANOIA 1 |
| 85 | #if RAID5_PARANOIA && defined(CONFIG_SMP) |
| 86 | # define CHECK_DEVLOCK() assert_spin_locked(&conf->device_lock) |
| 87 | #else |
| 88 | # define CHECK_DEVLOCK() |
| 89 | #endif |
| 90 | |
| 91 | #define PRINTK(x...) ((void)(RAID5_DEBUG && printk(x))) |
| 92 | #if RAID5_DEBUG |
| 93 | #define inline |
| 94 | #define __inline__ |
| 95 | #endif |
| 96 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 97 | #if !RAID6_USE_EMPTY_ZERO_PAGE |
| 98 | /* In .bss so it's zeroed */ |
| 99 | const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256))); |
| 100 | #endif |
| 101 | |
| 102 | static inline int raid6_next_disk(int disk, int raid_disks) |
| 103 | { |
| 104 | disk++; |
| 105 | return (disk < raid_disks) ? disk : 0; |
| 106 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | static void print_raid5_conf (raid5_conf_t *conf); |
| 108 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 109 | static void __release_stripe(raid5_conf_t *conf, struct stripe_head *sh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | { |
| 111 | if (atomic_dec_and_test(&sh->count)) { |
Eric Sesterhenn | 78bafeb | 2006-04-02 13:31:42 +0200 | [diff] [blame] | 112 | BUG_ON(!list_empty(&sh->lru)); |
| 113 | BUG_ON(atomic_read(&conf->active_stripes)==0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
NeilBrown | 7c785b7 | 2006-07-10 04:44:16 -0700 | [diff] [blame] | 115 | if (test_bit(STRIPE_DELAYED, &sh->state)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | list_add_tail(&sh->lru, &conf->delayed_list); |
NeilBrown | 7c785b7 | 2006-07-10 04:44:16 -0700 | [diff] [blame] | 117 | blk_plug_device(conf->mddev->queue); |
| 118 | } else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && |
NeilBrown | ae3c20c | 2006-07-10 04:44:17 -0700 | [diff] [blame] | 119 | sh->bm_seq - conf->seq_write > 0) { |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 120 | list_add_tail(&sh->lru, &conf->bitmap_list); |
NeilBrown | 7c785b7 | 2006-07-10 04:44:16 -0700 | [diff] [blame] | 121 | blk_plug_device(conf->mddev->queue); |
| 122 | } else { |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 123 | clear_bit(STRIPE_BIT_DELAY, &sh->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | list_add_tail(&sh->lru, &conf->handle_list); |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 125 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | md_wakeup_thread(conf->mddev->thread); |
| 127 | } else { |
| 128 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { |
| 129 | atomic_dec(&conf->preread_active_stripes); |
| 130 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) |
| 131 | md_wakeup_thread(conf->mddev->thread); |
| 132 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | atomic_dec(&conf->active_stripes); |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 134 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
| 135 | list_add_tail(&sh->lru, &conf->inactive_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | wake_up(&conf->wait_for_stripe); |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 137 | if (conf->retry_read_aligned) |
| 138 | md_wakeup_thread(conf->mddev->thread); |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 139 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
| 141 | } |
| 142 | } |
| 143 | static void release_stripe(struct stripe_head *sh) |
| 144 | { |
| 145 | raid5_conf_t *conf = sh->raid_conf; |
| 146 | unsigned long flags; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | spin_lock_irqsave(&conf->device_lock, flags); |
| 149 | __release_stripe(conf, sh); |
| 150 | spin_unlock_irqrestore(&conf->device_lock, flags); |
| 151 | } |
| 152 | |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 153 | static inline void remove_hash(struct stripe_head *sh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | { |
| 155 | PRINTK("remove_hash(), stripe %llu\n", (unsigned long long)sh->sector); |
| 156 | |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 157 | hlist_del_init(&sh->hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | } |
| 159 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 160 | static inline void insert_hash(raid5_conf_t *conf, struct stripe_head *sh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | { |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 162 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
| 164 | PRINTK("insert_hash(), stripe %llu\n", (unsigned long long)sh->sector); |
| 165 | |
| 166 | CHECK_DEVLOCK(); |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 167 | hlist_add_head(&sh->hash, hp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | |
| 171 | /* find an idle stripe, make sure it is unhashed, and return it. */ |
| 172 | static struct stripe_head *get_free_stripe(raid5_conf_t *conf) |
| 173 | { |
| 174 | struct stripe_head *sh = NULL; |
| 175 | struct list_head *first; |
| 176 | |
| 177 | CHECK_DEVLOCK(); |
| 178 | if (list_empty(&conf->inactive_list)) |
| 179 | goto out; |
| 180 | first = conf->inactive_list.next; |
| 181 | sh = list_entry(first, struct stripe_head, lru); |
| 182 | list_del_init(first); |
| 183 | remove_hash(sh); |
| 184 | atomic_inc(&conf->active_stripes); |
| 185 | out: |
| 186 | return sh; |
| 187 | } |
| 188 | |
| 189 | static void shrink_buffers(struct stripe_head *sh, int num) |
| 190 | { |
| 191 | struct page *p; |
| 192 | int i; |
| 193 | |
| 194 | for (i=0; i<num ; i++) { |
| 195 | p = sh->dev[i].page; |
| 196 | if (!p) |
| 197 | continue; |
| 198 | sh->dev[i].page = NULL; |
NeilBrown | 2d1f3b5 | 2006-01-06 00:20:31 -0800 | [diff] [blame] | 199 | put_page(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | } |
| 201 | } |
| 202 | |
| 203 | static int grow_buffers(struct stripe_head *sh, int num) |
| 204 | { |
| 205 | int i; |
| 206 | |
| 207 | for (i=0; i<num; i++) { |
| 208 | struct page *page; |
| 209 | |
| 210 | if (!(page = alloc_page(GFP_KERNEL))) { |
| 211 | return 1; |
| 212 | } |
| 213 | sh->dev[i].page = page; |
| 214 | } |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | static void raid5_build_block (struct stripe_head *sh, int i); |
| 219 | |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 220 | static void init_stripe(struct stripe_head *sh, sector_t sector, int pd_idx, int disks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | { |
| 222 | raid5_conf_t *conf = sh->raid_conf; |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 223 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
Eric Sesterhenn | 78bafeb | 2006-04-02 13:31:42 +0200 | [diff] [blame] | 225 | BUG_ON(atomic_read(&sh->count) != 0); |
| 226 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
| 228 | CHECK_DEVLOCK(); |
| 229 | PRINTK("init_stripe called, stripe %llu\n", |
| 230 | (unsigned long long)sh->sector); |
| 231 | |
| 232 | remove_hash(sh); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | sh->sector = sector; |
| 235 | sh->pd_idx = pd_idx; |
| 236 | sh->state = 0; |
| 237 | |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 238 | sh->disks = disks; |
| 239 | |
| 240 | for (i = sh->disks; i--; ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | struct r5dev *dev = &sh->dev[i]; |
| 242 | |
| 243 | if (dev->toread || dev->towrite || dev->written || |
| 244 | test_bit(R5_LOCKED, &dev->flags)) { |
| 245 | printk("sector=%llx i=%d %p %p %p %d\n", |
| 246 | (unsigned long long)sh->sector, i, dev->toread, |
| 247 | dev->towrite, dev->written, |
| 248 | test_bit(R5_LOCKED, &dev->flags)); |
| 249 | BUG(); |
| 250 | } |
| 251 | dev->flags = 0; |
| 252 | raid5_build_block(sh, i); |
| 253 | } |
| 254 | insert_hash(conf, sh); |
| 255 | } |
| 256 | |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 257 | static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, int disks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | { |
| 259 | struct stripe_head *sh; |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 260 | struct hlist_node *hn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
| 262 | CHECK_DEVLOCK(); |
| 263 | PRINTK("__find_stripe, sector %llu\n", (unsigned long long)sector); |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 264 | hlist_for_each_entry(sh, hn, stripe_hash(conf, sector), hash) |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 265 | if (sh->sector == sector && sh->disks == disks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | return sh; |
| 267 | PRINTK("__stripe %llu not in cache\n", (unsigned long long)sector); |
| 268 | return NULL; |
| 269 | } |
| 270 | |
| 271 | static void unplug_slaves(mddev_t *mddev); |
| 272 | static void raid5_unplug_device(request_queue_t *q); |
| 273 | |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 274 | static struct stripe_head *get_active_stripe(raid5_conf_t *conf, sector_t sector, int disks, |
| 275 | int pd_idx, int noblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | { |
| 277 | struct stripe_head *sh; |
| 278 | |
| 279 | PRINTK("get_stripe, sector %llu\n", (unsigned long long)sector); |
| 280 | |
| 281 | spin_lock_irq(&conf->device_lock); |
| 282 | |
| 283 | do { |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 284 | wait_event_lock_irq(conf->wait_for_stripe, |
| 285 | conf->quiesce == 0, |
| 286 | conf->device_lock, /* nothing */); |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 287 | sh = __find_stripe(conf, sector, disks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | if (!sh) { |
| 289 | if (!conf->inactive_blocked) |
| 290 | sh = get_free_stripe(conf); |
| 291 | if (noblock && sh == NULL) |
| 292 | break; |
| 293 | if (!sh) { |
| 294 | conf->inactive_blocked = 1; |
| 295 | wait_event_lock_irq(conf->wait_for_stripe, |
| 296 | !list_empty(&conf->inactive_list) && |
NeilBrown | 5036805 | 2005-12-12 02:39:17 -0800 | [diff] [blame] | 297 | (atomic_read(&conf->active_stripes) |
| 298 | < (conf->max_nr_stripes *3/4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | || !conf->inactive_blocked), |
| 300 | conf->device_lock, |
NeilBrown | f437078 | 2006-07-10 04:44:14 -0700 | [diff] [blame] | 301 | raid5_unplug_device(conf->mddev->queue) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | ); |
| 303 | conf->inactive_blocked = 0; |
| 304 | } else |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 305 | init_stripe(sh, sector, pd_idx, disks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } else { |
| 307 | if (atomic_read(&sh->count)) { |
Eric Sesterhenn | 78bafeb | 2006-04-02 13:31:42 +0200 | [diff] [blame] | 308 | BUG_ON(!list_empty(&sh->lru)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | } else { |
| 310 | if (!test_bit(STRIPE_HANDLE, &sh->state)) |
| 311 | atomic_inc(&conf->active_stripes); |
NeilBrown | ff4e8d9 | 2006-07-10 04:44:16 -0700 | [diff] [blame] | 312 | if (list_empty(&sh->lru) && |
| 313 | !test_bit(STRIPE_EXPANDING, &sh->state)) |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 314 | BUG(); |
| 315 | list_del_init(&sh->lru); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | } |
| 317 | } |
| 318 | } while (sh == NULL); |
| 319 | |
| 320 | if (sh) |
| 321 | atomic_inc(&sh->count); |
| 322 | |
| 323 | spin_unlock_irq(&conf->device_lock); |
| 324 | return sh; |
| 325 | } |
| 326 | |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 327 | static int grow_one_stripe(raid5_conf_t *conf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | { |
| 329 | struct stripe_head *sh; |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 330 | sh = kmem_cache_alloc(conf->slab_cache, GFP_KERNEL); |
| 331 | if (!sh) |
| 332 | return 0; |
| 333 | memset(sh, 0, sizeof(*sh) + (conf->raid_disks-1)*sizeof(struct r5dev)); |
| 334 | sh->raid_conf = conf; |
| 335 | spin_lock_init(&sh->lock); |
| 336 | |
| 337 | if (grow_buffers(sh, conf->raid_disks)) { |
| 338 | shrink_buffers(sh, conf->raid_disks); |
| 339 | kmem_cache_free(conf->slab_cache, sh); |
| 340 | return 0; |
| 341 | } |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 342 | sh->disks = conf->raid_disks; |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 343 | /* we just created an active stripe so... */ |
| 344 | atomic_set(&sh->count, 1); |
| 345 | atomic_inc(&conf->active_stripes); |
| 346 | INIT_LIST_HEAD(&sh->lru); |
| 347 | release_stripe(sh); |
| 348 | return 1; |
| 349 | } |
| 350 | |
| 351 | static int grow_stripes(raid5_conf_t *conf, int num) |
| 352 | { |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 353 | struct kmem_cache *sc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | int devs = conf->raid_disks; |
| 355 | |
NeilBrown | ad01c9e | 2006-03-27 01:18:07 -0800 | [diff] [blame] | 356 | sprintf(conf->cache_name[0], "raid5/%s", mdname(conf->mddev)); |
| 357 | sprintf(conf->cache_name[1], "raid5/%s-alt", mdname(conf->mddev)); |
| 358 | conf->active_name = 0; |
| 359 | sc = kmem_cache_create(conf->cache_name[conf->active_name], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
| 361 | 0, 0, NULL, NULL); |
| 362 | if (!sc) |
| 363 | return 1; |
| 364 | conf->slab_cache = sc; |
NeilBrown | ad01c9e | 2006-03-27 01:18:07 -0800 | [diff] [blame] | 365 | conf->pool_size = devs; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 366 | while (num--) |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 367 | if (!grow_one_stripe(conf)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | return 0; |
| 370 | } |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 371 | |
| 372 | #ifdef CONFIG_MD_RAID5_RESHAPE |
NeilBrown | ad01c9e | 2006-03-27 01:18:07 -0800 | [diff] [blame] | 373 | static int resize_stripes(raid5_conf_t *conf, int newsize) |
| 374 | { |
| 375 | /* Make all the stripes able to hold 'newsize' devices. |
| 376 | * New slots in each stripe get 'page' set to a new page. |
| 377 | * |
| 378 | * This happens in stages: |
| 379 | * 1/ create a new kmem_cache and allocate the required number of |
| 380 | * stripe_heads. |
| 381 | * 2/ gather all the old stripe_heads and tranfer the pages across |
| 382 | * to the new stripe_heads. This will have the side effect of |
| 383 | * freezing the array as once all stripe_heads have been collected, |
| 384 | * no IO will be possible. Old stripe heads are freed once their |
| 385 | * pages have been transferred over, and the old kmem_cache is |
| 386 | * freed when all stripes are done. |
| 387 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, |
| 388 | * we simple return a failre status - no need to clean anything up. |
| 389 | * 4/ allocate new pages for the new slots in the new stripe_heads. |
| 390 | * If this fails, we don't bother trying the shrink the |
| 391 | * stripe_heads down again, we just leave them as they are. |
| 392 | * As each stripe_head is processed the new one is released into |
| 393 | * active service. |
| 394 | * |
| 395 | * Once step2 is started, we cannot afford to wait for a write, |
| 396 | * so we use GFP_NOIO allocations. |
| 397 | */ |
| 398 | struct stripe_head *osh, *nsh; |
| 399 | LIST_HEAD(newstripes); |
| 400 | struct disk_info *ndisks; |
| 401 | int err = 0; |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 402 | struct kmem_cache *sc; |
NeilBrown | ad01c9e | 2006-03-27 01:18:07 -0800 | [diff] [blame] | 403 | int i; |
| 404 | |
| 405 | if (newsize <= conf->pool_size) |
| 406 | return 0; /* never bother to shrink */ |
| 407 | |
NeilBrown | 2a2275d | 2007-01-26 00:57:11 -0800 | [diff] [blame] | 408 | md_allow_write(conf->mddev); |
| 409 | |
NeilBrown | ad01c9e | 2006-03-27 01:18:07 -0800 | [diff] [blame] | 410 | /* Step 1 */ |
| 411 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], |
| 412 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), |
| 413 | 0, 0, NULL, NULL); |
| 414 | if (!sc) |
| 415 | return -ENOMEM; |
| 416 | |
| 417 | for (i = conf->max_nr_stripes; i; i--) { |
| 418 | nsh = kmem_cache_alloc(sc, GFP_KERNEL); |
| 419 | if (!nsh) |
| 420 | break; |
| 421 | |
| 422 | memset(nsh, 0, sizeof(*nsh) + (newsize-1)*sizeof(struct r5dev)); |
| 423 | |
| 424 | nsh->raid_conf = conf; |
| 425 | spin_lock_init(&nsh->lock); |
| 426 | |
| 427 | list_add(&nsh->lru, &newstripes); |
| 428 | } |
| 429 | if (i) { |
| 430 | /* didn't get enough, give up */ |
| 431 | while (!list_empty(&newstripes)) { |
| 432 | nsh = list_entry(newstripes.next, struct stripe_head, lru); |
| 433 | list_del(&nsh->lru); |
| 434 | kmem_cache_free(sc, nsh); |
| 435 | } |
| 436 | kmem_cache_destroy(sc); |
| 437 | return -ENOMEM; |
| 438 | } |
| 439 | /* Step 2 - Must use GFP_NOIO now. |
| 440 | * OK, we have enough stripes, start collecting inactive |
| 441 | * stripes and copying them over |
| 442 | */ |
| 443 | list_for_each_entry(nsh, &newstripes, lru) { |
| 444 | spin_lock_irq(&conf->device_lock); |
| 445 | wait_event_lock_irq(conf->wait_for_stripe, |
| 446 | !list_empty(&conf->inactive_list), |
| 447 | conf->device_lock, |
NeilBrown | b3b46be | 2006-03-27 01:18:16 -0800 | [diff] [blame] | 448 | unplug_slaves(conf->mddev) |
NeilBrown | ad01c9e | 2006-03-27 01:18:07 -0800 | [diff] [blame] | 449 | ); |
| 450 | osh = get_free_stripe(conf); |
| 451 | spin_unlock_irq(&conf->device_lock); |
| 452 | atomic_set(&nsh->count, 1); |
| 453 | for(i=0; i<conf->pool_size; i++) |
| 454 | nsh->dev[i].page = osh->dev[i].page; |
| 455 | for( ; i<newsize; i++) |
| 456 | nsh->dev[i].page = NULL; |
| 457 | kmem_cache_free(conf->slab_cache, osh); |
| 458 | } |
| 459 | kmem_cache_destroy(conf->slab_cache); |
| 460 | |
| 461 | /* Step 3. |
| 462 | * At this point, we are holding all the stripes so the array |
| 463 | * is completely stalled, so now is a good time to resize |
| 464 | * conf->disks. |
| 465 | */ |
| 466 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); |
| 467 | if (ndisks) { |
| 468 | for (i=0; i<conf->raid_disks; i++) |
| 469 | ndisks[i] = conf->disks[i]; |
| 470 | kfree(conf->disks); |
| 471 | conf->disks = ndisks; |
| 472 | } else |
| 473 | err = -ENOMEM; |
| 474 | |
| 475 | /* Step 4, return new stripes to service */ |
| 476 | while(!list_empty(&newstripes)) { |
| 477 | nsh = list_entry(newstripes.next, struct stripe_head, lru); |
| 478 | list_del_init(&nsh->lru); |
| 479 | for (i=conf->raid_disks; i < newsize; i++) |
| 480 | if (nsh->dev[i].page == NULL) { |
| 481 | struct page *p = alloc_page(GFP_NOIO); |
| 482 | nsh->dev[i].page = p; |
| 483 | if (!p) |
| 484 | err = -ENOMEM; |
| 485 | } |
| 486 | release_stripe(nsh); |
| 487 | } |
| 488 | /* critical section pass, GFP_NOIO no longer needed */ |
| 489 | |
| 490 | conf->slab_cache = sc; |
| 491 | conf->active_name = 1-conf->active_name; |
| 492 | conf->pool_size = newsize; |
| 493 | return err; |
| 494 | } |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 495 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 497 | static int drop_one_stripe(raid5_conf_t *conf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | { |
| 499 | struct stripe_head *sh; |
| 500 | |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 501 | spin_lock_irq(&conf->device_lock); |
| 502 | sh = get_free_stripe(conf); |
| 503 | spin_unlock_irq(&conf->device_lock); |
| 504 | if (!sh) |
| 505 | return 0; |
Eric Sesterhenn | 78bafeb | 2006-04-02 13:31:42 +0200 | [diff] [blame] | 506 | BUG_ON(atomic_read(&sh->count)); |
NeilBrown | ad01c9e | 2006-03-27 01:18:07 -0800 | [diff] [blame] | 507 | shrink_buffers(sh, conf->pool_size); |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 508 | kmem_cache_free(conf->slab_cache, sh); |
| 509 | atomic_dec(&conf->active_stripes); |
| 510 | return 1; |
| 511 | } |
| 512 | |
| 513 | static void shrink_stripes(raid5_conf_t *conf) |
| 514 | { |
| 515 | while (drop_one_stripe(conf)) |
| 516 | ; |
| 517 | |
NeilBrown | 29fc7e3 | 2006-02-03 03:03:41 -0800 | [diff] [blame] | 518 | if (conf->slab_cache) |
| 519 | kmem_cache_destroy(conf->slab_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | conf->slab_cache = NULL; |
| 521 | } |
| 522 | |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 523 | static int raid5_end_read_request(struct bio * bi, unsigned int bytes_done, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | int error) |
| 525 | { |
| 526 | struct stripe_head *sh = bi->bi_private; |
| 527 | raid5_conf_t *conf = sh->raid_conf; |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 528 | int disks = sh->disks, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
NeilBrown | d695043 | 2006-07-10 04:44:20 -0700 | [diff] [blame] | 530 | char b[BDEVNAME_SIZE]; |
| 531 | mdk_rdev_t *rdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
| 533 | if (bi->bi_size) |
| 534 | return 1; |
| 535 | |
| 536 | for (i=0 ; i<disks; i++) |
| 537 | if (bi == &sh->dev[i].req) |
| 538 | break; |
| 539 | |
| 540 | PRINTK("end_read_request %llu/%d, count: %d, uptodate %d.\n", |
| 541 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
| 542 | uptodate); |
| 543 | if (i == disks) { |
| 544 | BUG(); |
| 545 | return 0; |
| 546 | } |
| 547 | |
| 548 | if (uptodate) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 550 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
NeilBrown | d695043 | 2006-07-10 04:44:20 -0700 | [diff] [blame] | 551 | rdev = conf->disks[i].rdev; |
| 552 | printk(KERN_INFO "raid5:%s: read error corrected (%lu sectors at %llu on %s)\n", |
| 553 | mdname(conf->mddev), STRIPE_SECTORS, |
| 554 | (unsigned long long)sh->sector + rdev->data_offset, |
| 555 | bdevname(rdev->bdev, b)); |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 556 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
| 557 | clear_bit(R5_ReWrite, &sh->dev[i].flags); |
| 558 | } |
NeilBrown | ba22dcb | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 559 | if (atomic_read(&conf->disks[i].rdev->read_errors)) |
| 560 | atomic_set(&conf->disks[i].rdev->read_errors, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | } else { |
NeilBrown | d695043 | 2006-07-10 04:44:20 -0700 | [diff] [blame] | 562 | const char *bdn = bdevname(conf->disks[i].rdev->bdev, b); |
NeilBrown | ba22dcb | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 563 | int retry = 0; |
NeilBrown | d695043 | 2006-07-10 04:44:20 -0700 | [diff] [blame] | 564 | rdev = conf->disks[i].rdev; |
| 565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
NeilBrown | d695043 | 2006-07-10 04:44:20 -0700 | [diff] [blame] | 567 | atomic_inc(&rdev->read_errors); |
NeilBrown | ba22dcb | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 568 | if (conf->mddev->degraded) |
NeilBrown | d695043 | 2006-07-10 04:44:20 -0700 | [diff] [blame] | 569 | printk(KERN_WARNING "raid5:%s: read error not correctable (sector %llu on %s).\n", |
| 570 | mdname(conf->mddev), |
| 571 | (unsigned long long)sh->sector + rdev->data_offset, |
| 572 | bdn); |
NeilBrown | ba22dcb | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 573 | else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 574 | /* Oh, no!!! */ |
NeilBrown | d695043 | 2006-07-10 04:44:20 -0700 | [diff] [blame] | 575 | printk(KERN_WARNING "raid5:%s: read error NOT corrected!! (sector %llu on %s).\n", |
| 576 | mdname(conf->mddev), |
| 577 | (unsigned long long)sh->sector + rdev->data_offset, |
| 578 | bdn); |
| 579 | else if (atomic_read(&rdev->read_errors) |
NeilBrown | ba22dcb | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 580 | > conf->max_nr_stripes) |
NeilBrown | 14f8d26 | 2006-01-06 00:20:14 -0800 | [diff] [blame] | 581 | printk(KERN_WARNING |
NeilBrown | d695043 | 2006-07-10 04:44:20 -0700 | [diff] [blame] | 582 | "raid5:%s: Too many read errors, failing device %s.\n", |
| 583 | mdname(conf->mddev), bdn); |
NeilBrown | ba22dcb | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 584 | else |
| 585 | retry = 1; |
| 586 | if (retry) |
| 587 | set_bit(R5_ReadError, &sh->dev[i].flags); |
| 588 | else { |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 589 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
| 590 | clear_bit(R5_ReWrite, &sh->dev[i].flags); |
NeilBrown | d695043 | 2006-07-10 04:44:20 -0700 | [diff] [blame] | 591 | md_error(conf->mddev, rdev); |
NeilBrown | ba22dcb | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 592 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | } |
| 594 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
| 596 | set_bit(STRIPE_HANDLE, &sh->state); |
| 597 | release_stripe(sh); |
| 598 | return 0; |
| 599 | } |
| 600 | |
| 601 | static int raid5_end_write_request (struct bio *bi, unsigned int bytes_done, |
| 602 | int error) |
| 603 | { |
| 604 | struct stripe_head *sh = bi->bi_private; |
| 605 | raid5_conf_t *conf = sh->raid_conf; |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 606 | int disks = sh->disks, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
| 608 | |
| 609 | if (bi->bi_size) |
| 610 | return 1; |
| 611 | |
| 612 | for (i=0 ; i<disks; i++) |
| 613 | if (bi == &sh->dev[i].req) |
| 614 | break; |
| 615 | |
| 616 | PRINTK("end_write_request %llu/%d, count %d, uptodate: %d.\n", |
| 617 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
| 618 | uptodate); |
| 619 | if (i == disks) { |
| 620 | BUG(); |
| 621 | return 0; |
| 622 | } |
| 623 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | if (!uptodate) |
| 625 | md_error(conf->mddev, conf->disks[i].rdev); |
| 626 | |
| 627 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); |
| 628 | |
| 629 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
| 630 | set_bit(STRIPE_HANDLE, &sh->state); |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 631 | release_stripe(sh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | return 0; |
| 633 | } |
| 634 | |
| 635 | |
| 636 | static sector_t compute_blocknr(struct stripe_head *sh, int i); |
| 637 | |
| 638 | static void raid5_build_block (struct stripe_head *sh, int i) |
| 639 | { |
| 640 | struct r5dev *dev = &sh->dev[i]; |
| 641 | |
| 642 | bio_init(&dev->req); |
| 643 | dev->req.bi_io_vec = &dev->vec; |
| 644 | dev->req.bi_vcnt++; |
| 645 | dev->req.bi_max_vecs++; |
| 646 | dev->vec.bv_page = dev->page; |
| 647 | dev->vec.bv_len = STRIPE_SIZE; |
| 648 | dev->vec.bv_offset = 0; |
| 649 | |
| 650 | dev->req.bi_sector = sh->sector; |
| 651 | dev->req.bi_private = sh; |
| 652 | |
| 653 | dev->flags = 0; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 654 | dev->sector = compute_blocknr(sh, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | } |
| 656 | |
| 657 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) |
| 658 | { |
| 659 | char b[BDEVNAME_SIZE]; |
| 660 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; |
| 661 | PRINTK("raid5: error called\n"); |
| 662 | |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 663 | if (!test_bit(Faulty, &rdev->flags)) { |
NeilBrown | 850b2b4 | 2006-10-03 01:15:46 -0700 | [diff] [blame] | 664 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 665 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
| 666 | unsigned long flags; |
| 667 | spin_lock_irqsave(&conf->device_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | mddev->degraded++; |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 669 | spin_unlock_irqrestore(&conf->device_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | /* |
| 671 | * if recovery was running, make sure it aborts. |
| 672 | */ |
| 673 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); |
| 674 | } |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 675 | set_bit(Faulty, &rdev->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | printk (KERN_ALERT |
| 677 | "raid5: Disk failure on %s, disabling device." |
| 678 | " Operation continuing on %d devices\n", |
NeilBrown | 02c2de8 | 2006-10-03 01:15:47 -0700 | [diff] [blame] | 679 | bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 681 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
| 683 | /* |
| 684 | * Input: a 'big' sector number, |
| 685 | * Output: index of the data and parity disk, and the sector # in them. |
| 686 | */ |
| 687 | static sector_t raid5_compute_sector(sector_t r_sector, unsigned int raid_disks, |
| 688 | unsigned int data_disks, unsigned int * dd_idx, |
| 689 | unsigned int * pd_idx, raid5_conf_t *conf) |
| 690 | { |
| 691 | long stripe; |
| 692 | unsigned long chunk_number; |
| 693 | unsigned int chunk_offset; |
| 694 | sector_t new_sector; |
| 695 | int sectors_per_chunk = conf->chunk_size >> 9; |
| 696 | |
| 697 | /* First compute the information on this sector */ |
| 698 | |
| 699 | /* |
| 700 | * Compute the chunk number and the sector offset inside the chunk |
| 701 | */ |
| 702 | chunk_offset = sector_div(r_sector, sectors_per_chunk); |
| 703 | chunk_number = r_sector; |
| 704 | BUG_ON(r_sector != chunk_number); |
| 705 | |
| 706 | /* |
| 707 | * Compute the stripe number |
| 708 | */ |
| 709 | stripe = chunk_number / data_disks; |
| 710 | |
| 711 | /* |
| 712 | * Compute the data disk and parity disk indexes inside the stripe |
| 713 | */ |
| 714 | *dd_idx = chunk_number % data_disks; |
| 715 | |
| 716 | /* |
| 717 | * Select the parity disk based on the user selected algorithm. |
| 718 | */ |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 719 | switch(conf->level) { |
| 720 | case 4: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | *pd_idx = data_disks; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 722 | break; |
| 723 | case 5: |
| 724 | switch (conf->algorithm) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | case ALGORITHM_LEFT_ASYMMETRIC: |
| 726 | *pd_idx = data_disks - stripe % raid_disks; |
| 727 | if (*dd_idx >= *pd_idx) |
| 728 | (*dd_idx)++; |
| 729 | break; |
| 730 | case ALGORITHM_RIGHT_ASYMMETRIC: |
| 731 | *pd_idx = stripe % raid_disks; |
| 732 | if (*dd_idx >= *pd_idx) |
| 733 | (*dd_idx)++; |
| 734 | break; |
| 735 | case ALGORITHM_LEFT_SYMMETRIC: |
| 736 | *pd_idx = data_disks - stripe % raid_disks; |
| 737 | *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks; |
| 738 | break; |
| 739 | case ALGORITHM_RIGHT_SYMMETRIC: |
| 740 | *pd_idx = stripe % raid_disks; |
| 741 | *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks; |
| 742 | break; |
| 743 | default: |
NeilBrown | 14f8d26 | 2006-01-06 00:20:14 -0800 | [diff] [blame] | 744 | printk(KERN_ERR "raid5: unsupported algorithm %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | conf->algorithm); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 746 | } |
| 747 | break; |
| 748 | case 6: |
| 749 | |
| 750 | /**** FIX THIS ****/ |
| 751 | switch (conf->algorithm) { |
| 752 | case ALGORITHM_LEFT_ASYMMETRIC: |
| 753 | *pd_idx = raid_disks - 1 - (stripe % raid_disks); |
| 754 | if (*pd_idx == raid_disks-1) |
| 755 | (*dd_idx)++; /* Q D D D P */ |
| 756 | else if (*dd_idx >= *pd_idx) |
| 757 | (*dd_idx) += 2; /* D D P Q D */ |
| 758 | break; |
| 759 | case ALGORITHM_RIGHT_ASYMMETRIC: |
| 760 | *pd_idx = stripe % raid_disks; |
| 761 | if (*pd_idx == raid_disks-1) |
| 762 | (*dd_idx)++; /* Q D D D P */ |
| 763 | else if (*dd_idx >= *pd_idx) |
| 764 | (*dd_idx) += 2; /* D D P Q D */ |
| 765 | break; |
| 766 | case ALGORITHM_LEFT_SYMMETRIC: |
| 767 | *pd_idx = raid_disks - 1 - (stripe % raid_disks); |
| 768 | *dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks; |
| 769 | break; |
| 770 | case ALGORITHM_RIGHT_SYMMETRIC: |
| 771 | *pd_idx = stripe % raid_disks; |
| 772 | *dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks; |
| 773 | break; |
| 774 | default: |
| 775 | printk (KERN_CRIT "raid6: unsupported algorithm %d\n", |
| 776 | conf->algorithm); |
| 777 | } |
| 778 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | } |
| 780 | |
| 781 | /* |
| 782 | * Finally, compute the new sector number |
| 783 | */ |
| 784 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; |
| 785 | return new_sector; |
| 786 | } |
| 787 | |
| 788 | |
| 789 | static sector_t compute_blocknr(struct stripe_head *sh, int i) |
| 790 | { |
| 791 | raid5_conf_t *conf = sh->raid_conf; |
NeilBrown | b875e53 | 2006-12-10 02:20:49 -0800 | [diff] [blame] | 792 | int raid_disks = sh->disks; |
| 793 | int data_disks = raid_disks - conf->max_degraded; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | sector_t new_sector = sh->sector, check; |
| 795 | int sectors_per_chunk = conf->chunk_size >> 9; |
| 796 | sector_t stripe; |
| 797 | int chunk_offset; |
| 798 | int chunk_number, dummy1, dummy2, dd_idx = i; |
| 799 | sector_t r_sector; |
| 800 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 801 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | chunk_offset = sector_div(new_sector, sectors_per_chunk); |
| 803 | stripe = new_sector; |
| 804 | BUG_ON(new_sector != stripe); |
| 805 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 806 | if (i == sh->pd_idx) |
| 807 | return 0; |
| 808 | switch(conf->level) { |
| 809 | case 4: break; |
| 810 | case 5: |
| 811 | switch (conf->algorithm) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | case ALGORITHM_LEFT_ASYMMETRIC: |
| 813 | case ALGORITHM_RIGHT_ASYMMETRIC: |
| 814 | if (i > sh->pd_idx) |
| 815 | i--; |
| 816 | break; |
| 817 | case ALGORITHM_LEFT_SYMMETRIC: |
| 818 | case ALGORITHM_RIGHT_SYMMETRIC: |
| 819 | if (i < sh->pd_idx) |
| 820 | i += raid_disks; |
| 821 | i -= (sh->pd_idx + 1); |
| 822 | break; |
| 823 | default: |
NeilBrown | 14f8d26 | 2006-01-06 00:20:14 -0800 | [diff] [blame] | 824 | printk(KERN_ERR "raid5: unsupported algorithm %d\n", |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 825 | conf->algorithm); |
| 826 | } |
| 827 | break; |
| 828 | case 6: |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 829 | if (i == raid6_next_disk(sh->pd_idx, raid_disks)) |
| 830 | return 0; /* It is the Q disk */ |
| 831 | switch (conf->algorithm) { |
| 832 | case ALGORITHM_LEFT_ASYMMETRIC: |
| 833 | case ALGORITHM_RIGHT_ASYMMETRIC: |
| 834 | if (sh->pd_idx == raid_disks-1) |
| 835 | i--; /* Q D D D P */ |
| 836 | else if (i > sh->pd_idx) |
| 837 | i -= 2; /* D D P Q D */ |
| 838 | break; |
| 839 | case ALGORITHM_LEFT_SYMMETRIC: |
| 840 | case ALGORITHM_RIGHT_SYMMETRIC: |
| 841 | if (sh->pd_idx == raid_disks-1) |
| 842 | i--; /* Q D D D P */ |
| 843 | else { |
| 844 | /* D D P Q D */ |
| 845 | if (i < sh->pd_idx) |
| 846 | i += raid_disks; |
| 847 | i -= (sh->pd_idx + 2); |
| 848 | } |
| 849 | break; |
| 850 | default: |
| 851 | printk (KERN_CRIT "raid6: unsupported algorithm %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | conf->algorithm); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 853 | } |
| 854 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
| 856 | |
| 857 | chunk_number = stripe * data_disks + i; |
| 858 | r_sector = (sector_t)chunk_number * sectors_per_chunk + chunk_offset; |
| 859 | |
| 860 | check = raid5_compute_sector (r_sector, raid_disks, data_disks, &dummy1, &dummy2, conf); |
| 861 | if (check != sh->sector || dummy1 != dd_idx || dummy2 != sh->pd_idx) { |
NeilBrown | 14f8d26 | 2006-01-06 00:20:14 -0800 | [diff] [blame] | 862 | printk(KERN_ERR "compute_blocknr: map not correct\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | return 0; |
| 864 | } |
| 865 | return r_sector; |
| 866 | } |
| 867 | |
| 868 | |
| 869 | |
| 870 | /* |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 871 | * Copy data between a page in the stripe cache, and one or more bion |
| 872 | * The page could align with the middle of the bio, or there could be |
| 873 | * several bion, each with several bio_vecs, which cover part of the page |
| 874 | * Multiple bion are linked together on bi_next. There may be extras |
| 875 | * at the end of this list. We ignore them. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | */ |
| 877 | static void copy_data(int frombio, struct bio *bio, |
| 878 | struct page *page, |
| 879 | sector_t sector) |
| 880 | { |
| 881 | char *pa = page_address(page); |
| 882 | struct bio_vec *bvl; |
| 883 | int i; |
| 884 | int page_offset; |
| 885 | |
| 886 | if (bio->bi_sector >= sector) |
| 887 | page_offset = (signed)(bio->bi_sector - sector) * 512; |
| 888 | else |
| 889 | page_offset = (signed)(sector - bio->bi_sector) * -512; |
| 890 | bio_for_each_segment(bvl, bio, i) { |
| 891 | int len = bio_iovec_idx(bio,i)->bv_len; |
| 892 | int clen; |
| 893 | int b_offset = 0; |
| 894 | |
| 895 | if (page_offset < 0) { |
| 896 | b_offset = -page_offset; |
| 897 | page_offset += b_offset; |
| 898 | len -= b_offset; |
| 899 | } |
| 900 | |
| 901 | if (len > 0 && page_offset + len > STRIPE_SIZE) |
| 902 | clen = STRIPE_SIZE - page_offset; |
| 903 | else clen = len; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 904 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | if (clen > 0) { |
| 906 | char *ba = __bio_kmap_atomic(bio, i, KM_USER0); |
| 907 | if (frombio) |
| 908 | memcpy(pa+page_offset, ba+b_offset, clen); |
| 909 | else |
| 910 | memcpy(ba+b_offset, pa+page_offset, clen); |
| 911 | __bio_kunmap_atomic(ba, KM_USER0); |
| 912 | } |
| 913 | if (clen < len) /* hit end of page */ |
| 914 | break; |
| 915 | page_offset += len; |
| 916 | } |
| 917 | } |
| 918 | |
| 919 | #define check_xor() do { \ |
| 920 | if (count == MAX_XOR_BLOCKS) { \ |
| 921 | xor_block(count, STRIPE_SIZE, ptr); \ |
| 922 | count = 1; \ |
| 923 | } \ |
| 924 | } while(0) |
| 925 | |
| 926 | |
| 927 | static void compute_block(struct stripe_head *sh, int dd_idx) |
| 928 | { |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 929 | int i, count, disks = sh->disks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | void *ptr[MAX_XOR_BLOCKS], *p; |
| 931 | |
| 932 | PRINTK("compute_block, stripe %llu, idx %d\n", |
| 933 | (unsigned long long)sh->sector, dd_idx); |
| 934 | |
| 935 | ptr[0] = page_address(sh->dev[dd_idx].page); |
| 936 | memset(ptr[0], 0, STRIPE_SIZE); |
| 937 | count = 1; |
| 938 | for (i = disks ; i--; ) { |
| 939 | if (i == dd_idx) |
| 940 | continue; |
| 941 | p = page_address(sh->dev[i].page); |
| 942 | if (test_bit(R5_UPTODATE, &sh->dev[i].flags)) |
| 943 | ptr[count++] = p; |
| 944 | else |
NeilBrown | 14f8d26 | 2006-01-06 00:20:14 -0800 | [diff] [blame] | 945 | printk(KERN_ERR "compute_block() %d, stripe %llu, %d" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | " not present\n", dd_idx, |
| 947 | (unsigned long long)sh->sector, i); |
| 948 | |
| 949 | check_xor(); |
| 950 | } |
| 951 | if (count != 1) |
| 952 | xor_block(count, STRIPE_SIZE, ptr); |
| 953 | set_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); |
| 954 | } |
| 955 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 956 | static void compute_parity5(struct stripe_head *sh, int method) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | { |
| 958 | raid5_conf_t *conf = sh->raid_conf; |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 959 | int i, pd_idx = sh->pd_idx, disks = sh->disks, count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | void *ptr[MAX_XOR_BLOCKS]; |
| 961 | struct bio *chosen; |
| 962 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 963 | PRINTK("compute_parity5, stripe %llu, method %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | (unsigned long long)sh->sector, method); |
| 965 | |
| 966 | count = 1; |
| 967 | ptr[0] = page_address(sh->dev[pd_idx].page); |
| 968 | switch(method) { |
| 969 | case READ_MODIFY_WRITE: |
Eric Sesterhenn | 78bafeb | 2006-04-02 13:31:42 +0200 | [diff] [blame] | 970 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | for (i=disks ; i-- ;) { |
| 972 | if (i==pd_idx) |
| 973 | continue; |
| 974 | if (sh->dev[i].towrite && |
| 975 | test_bit(R5_UPTODATE, &sh->dev[i].flags)) { |
| 976 | ptr[count++] = page_address(sh->dev[i].page); |
| 977 | chosen = sh->dev[i].towrite; |
| 978 | sh->dev[i].towrite = NULL; |
| 979 | |
| 980 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
| 981 | wake_up(&conf->wait_for_overlap); |
| 982 | |
Eric Sesterhenn | 78bafeb | 2006-04-02 13:31:42 +0200 | [diff] [blame] | 983 | BUG_ON(sh->dev[i].written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | sh->dev[i].written = chosen; |
| 985 | check_xor(); |
| 986 | } |
| 987 | } |
| 988 | break; |
| 989 | case RECONSTRUCT_WRITE: |
| 990 | memset(ptr[0], 0, STRIPE_SIZE); |
| 991 | for (i= disks; i-- ;) |
| 992 | if (i!=pd_idx && sh->dev[i].towrite) { |
| 993 | chosen = sh->dev[i].towrite; |
| 994 | sh->dev[i].towrite = NULL; |
| 995 | |
| 996 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
| 997 | wake_up(&conf->wait_for_overlap); |
| 998 | |
Eric Sesterhenn | 78bafeb | 2006-04-02 13:31:42 +0200 | [diff] [blame] | 999 | BUG_ON(sh->dev[i].written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | sh->dev[i].written = chosen; |
| 1001 | } |
| 1002 | break; |
| 1003 | case CHECK_PARITY: |
| 1004 | break; |
| 1005 | } |
| 1006 | if (count>1) { |
| 1007 | xor_block(count, STRIPE_SIZE, ptr); |
| 1008 | count = 1; |
| 1009 | } |
| 1010 | |
| 1011 | for (i = disks; i--;) |
| 1012 | if (sh->dev[i].written) { |
| 1013 | sector_t sector = sh->dev[i].sector; |
| 1014 | struct bio *wbi = sh->dev[i].written; |
| 1015 | while (wbi && wbi->bi_sector < sector + STRIPE_SECTORS) { |
| 1016 | copy_data(1, wbi, sh->dev[i].page, sector); |
| 1017 | wbi = r5_next_bio(wbi, sector); |
| 1018 | } |
| 1019 | |
| 1020 | set_bit(R5_LOCKED, &sh->dev[i].flags); |
| 1021 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
| 1022 | } |
| 1023 | |
| 1024 | switch(method) { |
| 1025 | case RECONSTRUCT_WRITE: |
| 1026 | case CHECK_PARITY: |
| 1027 | for (i=disks; i--;) |
| 1028 | if (i != pd_idx) { |
| 1029 | ptr[count++] = page_address(sh->dev[i].page); |
| 1030 | check_xor(); |
| 1031 | } |
| 1032 | break; |
| 1033 | case READ_MODIFY_WRITE: |
| 1034 | for (i = disks; i--;) |
| 1035 | if (sh->dev[i].written) { |
| 1036 | ptr[count++] = page_address(sh->dev[i].page); |
| 1037 | check_xor(); |
| 1038 | } |
| 1039 | } |
| 1040 | if (count != 1) |
| 1041 | xor_block(count, STRIPE_SIZE, ptr); |
| 1042 | |
| 1043 | if (method != CHECK_PARITY) { |
| 1044 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); |
| 1045 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); |
| 1046 | } else |
| 1047 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); |
| 1048 | } |
| 1049 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1050 | static void compute_parity6(struct stripe_head *sh, int method) |
| 1051 | { |
| 1052 | raid6_conf_t *conf = sh->raid_conf; |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 1053 | int i, pd_idx = sh->pd_idx, qd_idx, d0_idx, disks = sh->disks, count; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1054 | struct bio *chosen; |
| 1055 | /**** FIX THIS: This could be very bad if disks is close to 256 ****/ |
| 1056 | void *ptrs[disks]; |
| 1057 | |
| 1058 | qd_idx = raid6_next_disk(pd_idx, disks); |
| 1059 | d0_idx = raid6_next_disk(qd_idx, disks); |
| 1060 | |
| 1061 | PRINTK("compute_parity, stripe %llu, method %d\n", |
| 1062 | (unsigned long long)sh->sector, method); |
| 1063 | |
| 1064 | switch(method) { |
| 1065 | case READ_MODIFY_WRITE: |
| 1066 | BUG(); /* READ_MODIFY_WRITE N/A for RAID-6 */ |
| 1067 | case RECONSTRUCT_WRITE: |
| 1068 | for (i= disks; i-- ;) |
| 1069 | if ( i != pd_idx && i != qd_idx && sh->dev[i].towrite ) { |
| 1070 | chosen = sh->dev[i].towrite; |
| 1071 | sh->dev[i].towrite = NULL; |
| 1072 | |
| 1073 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
| 1074 | wake_up(&conf->wait_for_overlap); |
| 1075 | |
Eric Sesterhenn | 52e5f9d | 2006-10-03 23:33:23 +0200 | [diff] [blame] | 1076 | BUG_ON(sh->dev[i].written); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1077 | sh->dev[i].written = chosen; |
| 1078 | } |
| 1079 | break; |
| 1080 | case CHECK_PARITY: |
| 1081 | BUG(); /* Not implemented yet */ |
| 1082 | } |
| 1083 | |
| 1084 | for (i = disks; i--;) |
| 1085 | if (sh->dev[i].written) { |
| 1086 | sector_t sector = sh->dev[i].sector; |
| 1087 | struct bio *wbi = sh->dev[i].written; |
| 1088 | while (wbi && wbi->bi_sector < sector + STRIPE_SECTORS) { |
| 1089 | copy_data(1, wbi, sh->dev[i].page, sector); |
| 1090 | wbi = r5_next_bio(wbi, sector); |
| 1091 | } |
| 1092 | |
| 1093 | set_bit(R5_LOCKED, &sh->dev[i].flags); |
| 1094 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
| 1095 | } |
| 1096 | |
| 1097 | // switch(method) { |
| 1098 | // case RECONSTRUCT_WRITE: |
| 1099 | // case CHECK_PARITY: |
| 1100 | // case UPDATE_PARITY: |
| 1101 | /* Note that unlike RAID-5, the ordering of the disks matters greatly. */ |
| 1102 | /* FIX: Is this ordering of drives even remotely optimal? */ |
| 1103 | count = 0; |
| 1104 | i = d0_idx; |
| 1105 | do { |
| 1106 | ptrs[count++] = page_address(sh->dev[i].page); |
| 1107 | if (count <= disks-2 && !test_bit(R5_UPTODATE, &sh->dev[i].flags)) |
| 1108 | printk("block %d/%d not uptodate on parity calc\n", i,count); |
| 1109 | i = raid6_next_disk(i, disks); |
| 1110 | } while ( i != d0_idx ); |
| 1111 | // break; |
| 1112 | // } |
| 1113 | |
| 1114 | raid6_call.gen_syndrome(disks, STRIPE_SIZE, ptrs); |
| 1115 | |
| 1116 | switch(method) { |
| 1117 | case RECONSTRUCT_WRITE: |
| 1118 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); |
| 1119 | set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); |
| 1120 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); |
| 1121 | set_bit(R5_LOCKED, &sh->dev[qd_idx].flags); |
| 1122 | break; |
| 1123 | case UPDATE_PARITY: |
| 1124 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); |
| 1125 | set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); |
| 1126 | break; |
| 1127 | } |
| 1128 | } |
| 1129 | |
| 1130 | |
| 1131 | /* Compute one missing block */ |
| 1132 | static void compute_block_1(struct stripe_head *sh, int dd_idx, int nozero) |
| 1133 | { |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 1134 | int i, count, disks = sh->disks; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1135 | void *ptr[MAX_XOR_BLOCKS], *p; |
| 1136 | int pd_idx = sh->pd_idx; |
| 1137 | int qd_idx = raid6_next_disk(pd_idx, disks); |
| 1138 | |
| 1139 | PRINTK("compute_block_1, stripe %llu, idx %d\n", |
| 1140 | (unsigned long long)sh->sector, dd_idx); |
| 1141 | |
| 1142 | if ( dd_idx == qd_idx ) { |
| 1143 | /* We're actually computing the Q drive */ |
| 1144 | compute_parity6(sh, UPDATE_PARITY); |
| 1145 | } else { |
| 1146 | ptr[0] = page_address(sh->dev[dd_idx].page); |
| 1147 | if (!nozero) memset(ptr[0], 0, STRIPE_SIZE); |
| 1148 | count = 1; |
| 1149 | for (i = disks ; i--; ) { |
| 1150 | if (i == dd_idx || i == qd_idx) |
| 1151 | continue; |
| 1152 | p = page_address(sh->dev[i].page); |
| 1153 | if (test_bit(R5_UPTODATE, &sh->dev[i].flags)) |
| 1154 | ptr[count++] = p; |
| 1155 | else |
| 1156 | printk("compute_block() %d, stripe %llu, %d" |
| 1157 | " not present\n", dd_idx, |
| 1158 | (unsigned long long)sh->sector, i); |
| 1159 | |
| 1160 | check_xor(); |
| 1161 | } |
| 1162 | if (count != 1) |
| 1163 | xor_block(count, STRIPE_SIZE, ptr); |
| 1164 | if (!nozero) set_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); |
| 1165 | else clear_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); |
| 1166 | } |
| 1167 | } |
| 1168 | |
| 1169 | /* Compute two missing blocks */ |
| 1170 | static void compute_block_2(struct stripe_head *sh, int dd_idx1, int dd_idx2) |
| 1171 | { |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 1172 | int i, count, disks = sh->disks; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1173 | int pd_idx = sh->pd_idx; |
| 1174 | int qd_idx = raid6_next_disk(pd_idx, disks); |
| 1175 | int d0_idx = raid6_next_disk(qd_idx, disks); |
| 1176 | int faila, failb; |
| 1177 | |
| 1178 | /* faila and failb are disk numbers relative to d0_idx */ |
| 1179 | /* pd_idx become disks-2 and qd_idx become disks-1 */ |
| 1180 | faila = (dd_idx1 < d0_idx) ? dd_idx1+(disks-d0_idx) : dd_idx1-d0_idx; |
| 1181 | failb = (dd_idx2 < d0_idx) ? dd_idx2+(disks-d0_idx) : dd_idx2-d0_idx; |
| 1182 | |
| 1183 | BUG_ON(faila == failb); |
| 1184 | if ( failb < faila ) { int tmp = faila; faila = failb; failb = tmp; } |
| 1185 | |
| 1186 | PRINTK("compute_block_2, stripe %llu, idx %d,%d (%d,%d)\n", |
| 1187 | (unsigned long long)sh->sector, dd_idx1, dd_idx2, faila, failb); |
| 1188 | |
| 1189 | if ( failb == disks-1 ) { |
| 1190 | /* Q disk is one of the missing disks */ |
| 1191 | if ( faila == disks-2 ) { |
| 1192 | /* Missing P+Q, just recompute */ |
| 1193 | compute_parity6(sh, UPDATE_PARITY); |
| 1194 | return; |
| 1195 | } else { |
| 1196 | /* We're missing D+Q; recompute D from P */ |
| 1197 | compute_block_1(sh, (dd_idx1 == qd_idx) ? dd_idx2 : dd_idx1, 0); |
| 1198 | compute_parity6(sh, UPDATE_PARITY); /* Is this necessary? */ |
| 1199 | return; |
| 1200 | } |
| 1201 | } |
| 1202 | |
| 1203 | /* We're missing D+P or D+D; build pointer table */ |
| 1204 | { |
| 1205 | /**** FIX THIS: This could be very bad if disks is close to 256 ****/ |
| 1206 | void *ptrs[disks]; |
| 1207 | |
| 1208 | count = 0; |
| 1209 | i = d0_idx; |
| 1210 | do { |
| 1211 | ptrs[count++] = page_address(sh->dev[i].page); |
| 1212 | i = raid6_next_disk(i, disks); |
| 1213 | if (i != dd_idx1 && i != dd_idx2 && |
| 1214 | !test_bit(R5_UPTODATE, &sh->dev[i].flags)) |
| 1215 | printk("compute_2 with missing block %d/%d\n", count, i); |
| 1216 | } while ( i != d0_idx ); |
| 1217 | |
| 1218 | if ( failb == disks-2 ) { |
| 1219 | /* We're missing D+P. */ |
| 1220 | raid6_datap_recov(disks, STRIPE_SIZE, faila, ptrs); |
| 1221 | } else { |
| 1222 | /* We're missing D+D. */ |
| 1223 | raid6_2data_recov(disks, STRIPE_SIZE, faila, failb, ptrs); |
| 1224 | } |
| 1225 | |
| 1226 | /* Both the above update both missing blocks */ |
| 1227 | set_bit(R5_UPTODATE, &sh->dev[dd_idx1].flags); |
| 1228 | set_bit(R5_UPTODATE, &sh->dev[dd_idx2].flags); |
| 1229 | } |
| 1230 | } |
| 1231 | |
| 1232 | |
| 1233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | /* |
| 1235 | * Each stripe/dev can have one or more bion attached. |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1236 | * toread/towrite point to the first in a chain. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | * The bi_next chain must be in order. |
| 1238 | */ |
| 1239 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, int forwrite) |
| 1240 | { |
| 1241 | struct bio **bip; |
| 1242 | raid5_conf_t *conf = sh->raid_conf; |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1243 | int firstwrite=0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | |
| 1245 | PRINTK("adding bh b#%llu to stripe s#%llu\n", |
| 1246 | (unsigned long long)bi->bi_sector, |
| 1247 | (unsigned long long)sh->sector); |
| 1248 | |
| 1249 | |
| 1250 | spin_lock(&sh->lock); |
| 1251 | spin_lock_irq(&conf->device_lock); |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1252 | if (forwrite) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | bip = &sh->dev[dd_idx].towrite; |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1254 | if (*bip == NULL && sh->dev[dd_idx].written == NULL) |
| 1255 | firstwrite = 1; |
| 1256 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | bip = &sh->dev[dd_idx].toread; |
| 1258 | while (*bip && (*bip)->bi_sector < bi->bi_sector) { |
| 1259 | if ((*bip)->bi_sector + ((*bip)->bi_size >> 9) > bi->bi_sector) |
| 1260 | goto overlap; |
| 1261 | bip = & (*bip)->bi_next; |
| 1262 | } |
| 1263 | if (*bip && (*bip)->bi_sector < bi->bi_sector + ((bi->bi_size)>>9)) |
| 1264 | goto overlap; |
| 1265 | |
Eric Sesterhenn | 78bafeb | 2006-04-02 13:31:42 +0200 | [diff] [blame] | 1266 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | if (*bip) |
| 1268 | bi->bi_next = *bip; |
| 1269 | *bip = bi; |
| 1270 | bi->bi_phys_segments ++; |
| 1271 | spin_unlock_irq(&conf->device_lock); |
| 1272 | spin_unlock(&sh->lock); |
| 1273 | |
| 1274 | PRINTK("added bi b#%llu to stripe s#%llu, disk %d.\n", |
| 1275 | (unsigned long long)bi->bi_sector, |
| 1276 | (unsigned long long)sh->sector, dd_idx); |
| 1277 | |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1278 | if (conf->mddev->bitmap && firstwrite) { |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1279 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, |
| 1280 | STRIPE_SECTORS, 0); |
NeilBrown | ae3c20c | 2006-07-10 04:44:17 -0700 | [diff] [blame] | 1281 | sh->bm_seq = conf->seq_flush+1; |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1282 | set_bit(STRIPE_BIT_DELAY, &sh->state); |
| 1283 | } |
| 1284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | if (forwrite) { |
| 1286 | /* check if page is covered */ |
| 1287 | sector_t sector = sh->dev[dd_idx].sector; |
| 1288 | for (bi=sh->dev[dd_idx].towrite; |
| 1289 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && |
| 1290 | bi && bi->bi_sector <= sector; |
| 1291 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { |
| 1292 | if (bi->bi_sector + (bi->bi_size>>9) >= sector) |
| 1293 | sector = bi->bi_sector + (bi->bi_size>>9); |
| 1294 | } |
| 1295 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) |
| 1296 | set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags); |
| 1297 | } |
| 1298 | return 1; |
| 1299 | |
| 1300 | overlap: |
| 1301 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); |
| 1302 | spin_unlock_irq(&conf->device_lock); |
| 1303 | spin_unlock(&sh->lock); |
| 1304 | return 0; |
| 1305 | } |
| 1306 | |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 1307 | static void end_reshape(raid5_conf_t *conf); |
| 1308 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1309 | static int page_is_zero(struct page *p) |
| 1310 | { |
| 1311 | char *a = page_address(p); |
| 1312 | return ((*(u32*)a) == 0 && |
| 1313 | memcmp(a, a+4, STRIPE_SIZE-4)==0); |
| 1314 | } |
| 1315 | |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1316 | static int stripe_to_pdidx(sector_t stripe, raid5_conf_t *conf, int disks) |
| 1317 | { |
| 1318 | int sectors_per_chunk = conf->chunk_size >> 9; |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1319 | int pd_idx, dd_idx; |
Coywolf Qi Hunt | 2d2063c | 2006-10-03 01:15:50 -0700 | [diff] [blame] | 1320 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
| 1321 | |
NeilBrown | b875e53 | 2006-12-10 02:20:49 -0800 | [diff] [blame] | 1322 | raid5_compute_sector(stripe * (disks - conf->max_degraded) |
| 1323 | *sectors_per_chunk + chunk_offset, |
| 1324 | disks, disks - conf->max_degraded, |
| 1325 | &dd_idx, &pd_idx, conf); |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1326 | return pd_idx; |
| 1327 | } |
| 1328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | |
| 1330 | /* |
| 1331 | * handle_stripe - do things to a stripe. |
| 1332 | * |
| 1333 | * We lock the stripe and then examine the state of various bits |
| 1334 | * to see what needs to be done. |
| 1335 | * Possible results: |
| 1336 | * return some read request which now have data |
| 1337 | * return some write requests which are safely on disc |
| 1338 | * schedule a read on some buffers |
| 1339 | * schedule a write of some buffers |
| 1340 | * return confirmation of parity correctness |
| 1341 | * |
| 1342 | * Parity calculations are done inside the stripe lock |
| 1343 | * buffers are taken off read_list or write_list, and bh_cache buffers |
| 1344 | * get BH_Lock set before the stripe lock is released. |
| 1345 | * |
| 1346 | */ |
| 1347 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1348 | static void handle_stripe5(struct stripe_head *sh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | { |
| 1350 | raid5_conf_t *conf = sh->raid_conf; |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 1351 | int disks = sh->disks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | struct bio *return_bi= NULL; |
| 1353 | struct bio *bi; |
| 1354 | int i; |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1355 | int syncing, expanding, expanded; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | int locked=0, uptodate=0, to_read=0, to_write=0, failed=0, written=0; |
| 1357 | int non_overwrite = 0; |
| 1358 | int failed_num=0; |
| 1359 | struct r5dev *dev; |
| 1360 | |
| 1361 | PRINTK("handling stripe %llu, cnt=%d, pd_idx=%d\n", |
| 1362 | (unsigned long long)sh->sector, atomic_read(&sh->count), |
| 1363 | sh->pd_idx); |
| 1364 | |
| 1365 | spin_lock(&sh->lock); |
| 1366 | clear_bit(STRIPE_HANDLE, &sh->state); |
| 1367 | clear_bit(STRIPE_DELAYED, &sh->state); |
| 1368 | |
| 1369 | syncing = test_bit(STRIPE_SYNCING, &sh->state); |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1370 | expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
| 1371 | expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | /* Now to look around and see what can be done */ |
| 1373 | |
NeilBrown | 9910f16 | 2006-01-06 00:20:24 -0800 | [diff] [blame] | 1374 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | for (i=disks; i--; ) { |
| 1376 | mdk_rdev_t *rdev; |
| 1377 | dev = &sh->dev[i]; |
| 1378 | clear_bit(R5_Insync, &dev->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | |
| 1380 | PRINTK("check %d: state 0x%lx read %p write %p written %p\n", |
| 1381 | i, dev->flags, dev->toread, dev->towrite, dev->written); |
| 1382 | /* maybe we can reply to a read */ |
| 1383 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread) { |
| 1384 | struct bio *rbi, *rbi2; |
| 1385 | PRINTK("Return read for disc %d\n", i); |
| 1386 | spin_lock_irq(&conf->device_lock); |
| 1387 | rbi = dev->toread; |
| 1388 | dev->toread = NULL; |
| 1389 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) |
| 1390 | wake_up(&conf->wait_for_overlap); |
| 1391 | spin_unlock_irq(&conf->device_lock); |
| 1392 | while (rbi && rbi->bi_sector < dev->sector + STRIPE_SECTORS) { |
| 1393 | copy_data(0, rbi, dev->page, dev->sector); |
| 1394 | rbi2 = r5_next_bio(rbi, dev->sector); |
| 1395 | spin_lock_irq(&conf->device_lock); |
| 1396 | if (--rbi->bi_phys_segments == 0) { |
| 1397 | rbi->bi_next = return_bi; |
| 1398 | return_bi = rbi; |
| 1399 | } |
| 1400 | spin_unlock_irq(&conf->device_lock); |
| 1401 | rbi = rbi2; |
| 1402 | } |
| 1403 | } |
| 1404 | |
| 1405 | /* now count some things */ |
| 1406 | if (test_bit(R5_LOCKED, &dev->flags)) locked++; |
| 1407 | if (test_bit(R5_UPTODATE, &dev->flags)) uptodate++; |
| 1408 | |
| 1409 | |
| 1410 | if (dev->toread) to_read++; |
| 1411 | if (dev->towrite) { |
| 1412 | to_write++; |
| 1413 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
| 1414 | non_overwrite++; |
| 1415 | } |
| 1416 | if (dev->written) written++; |
NeilBrown | 9910f16 | 2006-01-06 00:20:24 -0800 | [diff] [blame] | 1417 | rdev = rcu_dereference(conf->disks[i].rdev); |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 1418 | if (!rdev || !test_bit(In_sync, &rdev->flags)) { |
NeilBrown | 14f8d26 | 2006-01-06 00:20:14 -0800 | [diff] [blame] | 1419 | /* The ReadError flag will just be confusing now */ |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 1420 | clear_bit(R5_ReadError, &dev->flags); |
| 1421 | clear_bit(R5_ReWrite, &dev->flags); |
| 1422 | } |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 1423 | if (!rdev || !test_bit(In_sync, &rdev->flags) |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 1424 | || test_bit(R5_ReadError, &dev->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | failed++; |
| 1426 | failed_num = i; |
| 1427 | } else |
| 1428 | set_bit(R5_Insync, &dev->flags); |
| 1429 | } |
NeilBrown | 9910f16 | 2006-01-06 00:20:24 -0800 | [diff] [blame] | 1430 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | PRINTK("locked=%d uptodate=%d to_read=%d" |
| 1432 | " to_write=%d failed=%d failed_num=%d\n", |
| 1433 | locked, uptodate, to_read, to_write, failed, failed_num); |
| 1434 | /* check if the array has lost two devices and, if so, some requests might |
| 1435 | * need to be failed |
| 1436 | */ |
| 1437 | if (failed > 1 && to_read+to_write+written) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | for (i=disks; i--; ) { |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1439 | int bitmap_end = 0; |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 1440 | |
| 1441 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
NeilBrown | 9910f16 | 2006-01-06 00:20:24 -0800 | [diff] [blame] | 1442 | mdk_rdev_t *rdev; |
| 1443 | rcu_read_lock(); |
| 1444 | rdev = rcu_dereference(conf->disks[i].rdev); |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 1445 | if (rdev && test_bit(In_sync, &rdev->flags)) |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 1446 | /* multiple read failures in one stripe */ |
| 1447 | md_error(conf->mddev, rdev); |
NeilBrown | 9910f16 | 2006-01-06 00:20:24 -0800 | [diff] [blame] | 1448 | rcu_read_unlock(); |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 1449 | } |
| 1450 | |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1451 | spin_lock_irq(&conf->device_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | /* fail all writes first */ |
| 1453 | bi = sh->dev[i].towrite; |
| 1454 | sh->dev[i].towrite = NULL; |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1455 | if (bi) { to_write--; bitmap_end = 1; } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | |
| 1457 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
| 1458 | wake_up(&conf->wait_for_overlap); |
| 1459 | |
| 1460 | while (bi && bi->bi_sector < sh->dev[i].sector + STRIPE_SECTORS){ |
| 1461 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); |
| 1462 | clear_bit(BIO_UPTODATE, &bi->bi_flags); |
| 1463 | if (--bi->bi_phys_segments == 0) { |
| 1464 | md_write_end(conf->mddev); |
| 1465 | bi->bi_next = return_bi; |
| 1466 | return_bi = bi; |
| 1467 | } |
| 1468 | bi = nextbi; |
| 1469 | } |
| 1470 | /* and fail all 'written' */ |
| 1471 | bi = sh->dev[i].written; |
| 1472 | sh->dev[i].written = NULL; |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1473 | if (bi) bitmap_end = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | while (bi && bi->bi_sector < sh->dev[i].sector + STRIPE_SECTORS) { |
| 1475 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); |
| 1476 | clear_bit(BIO_UPTODATE, &bi->bi_flags); |
| 1477 | if (--bi->bi_phys_segments == 0) { |
| 1478 | md_write_end(conf->mddev); |
| 1479 | bi->bi_next = return_bi; |
| 1480 | return_bi = bi; |
| 1481 | } |
| 1482 | bi = bi2; |
| 1483 | } |
| 1484 | |
| 1485 | /* fail any reads if this device is non-operational */ |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 1486 | if (!test_bit(R5_Insync, &sh->dev[i].flags) || |
| 1487 | test_bit(R5_ReadError, &sh->dev[i].flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | bi = sh->dev[i].toread; |
| 1489 | sh->dev[i].toread = NULL; |
| 1490 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
| 1491 | wake_up(&conf->wait_for_overlap); |
| 1492 | if (bi) to_read--; |
| 1493 | while (bi && bi->bi_sector < sh->dev[i].sector + STRIPE_SECTORS){ |
| 1494 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); |
| 1495 | clear_bit(BIO_UPTODATE, &bi->bi_flags); |
| 1496 | if (--bi->bi_phys_segments == 0) { |
| 1497 | bi->bi_next = return_bi; |
| 1498 | return_bi = bi; |
| 1499 | } |
| 1500 | bi = nextbi; |
| 1501 | } |
| 1502 | } |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1503 | spin_unlock_irq(&conf->device_lock); |
| 1504 | if (bitmap_end) |
| 1505 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
| 1506 | STRIPE_SECTORS, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | } |
| 1509 | if (failed > 1 && syncing) { |
| 1510 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
| 1511 | clear_bit(STRIPE_SYNCING, &sh->state); |
| 1512 | syncing = 0; |
| 1513 | } |
| 1514 | |
| 1515 | /* might be able to return some write requests if the parity block |
| 1516 | * is safe, or on a failed drive |
| 1517 | */ |
| 1518 | dev = &sh->dev[sh->pd_idx]; |
| 1519 | if ( written && |
| 1520 | ( (test_bit(R5_Insync, &dev->flags) && !test_bit(R5_LOCKED, &dev->flags) && |
| 1521 | test_bit(R5_UPTODATE, &dev->flags)) |
| 1522 | || (failed == 1 && failed_num == sh->pd_idx)) |
| 1523 | ) { |
| 1524 | /* any written block on an uptodate or failed drive can be returned. |
| 1525 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but |
| 1526 | * never LOCKED, so we don't need to test 'failed' directly. |
| 1527 | */ |
| 1528 | for (i=disks; i--; ) |
| 1529 | if (sh->dev[i].written) { |
| 1530 | dev = &sh->dev[i]; |
| 1531 | if (!test_bit(R5_LOCKED, &dev->flags) && |
| 1532 | test_bit(R5_UPTODATE, &dev->flags) ) { |
| 1533 | /* We can return any write requests */ |
| 1534 | struct bio *wbi, *wbi2; |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1535 | int bitmap_end = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | PRINTK("Return write for disc %d\n", i); |
| 1537 | spin_lock_irq(&conf->device_lock); |
| 1538 | wbi = dev->written; |
| 1539 | dev->written = NULL; |
| 1540 | while (wbi && wbi->bi_sector < dev->sector + STRIPE_SECTORS) { |
| 1541 | wbi2 = r5_next_bio(wbi, dev->sector); |
| 1542 | if (--wbi->bi_phys_segments == 0) { |
| 1543 | md_write_end(conf->mddev); |
| 1544 | wbi->bi_next = return_bi; |
| 1545 | return_bi = wbi; |
| 1546 | } |
| 1547 | wbi = wbi2; |
| 1548 | } |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1549 | if (dev->towrite == NULL) |
| 1550 | bitmap_end = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | spin_unlock_irq(&conf->device_lock); |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1552 | if (bitmap_end) |
| 1553 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
| 1554 | STRIPE_SECTORS, |
| 1555 | !test_bit(STRIPE_DEGRADED, &sh->state), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | } |
| 1557 | } |
| 1558 | } |
| 1559 | |
| 1560 | /* Now we might consider reading some blocks, either to check/generate |
| 1561 | * parity, or to satisfy requests |
| 1562 | * or to load a block that is being partially written. |
| 1563 | */ |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1564 | if (to_read || non_overwrite || (syncing && (uptodate < disks)) || expanding) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | for (i=disks; i--;) { |
| 1566 | dev = &sh->dev[i]; |
| 1567 | if (!test_bit(R5_LOCKED, &dev->flags) && !test_bit(R5_UPTODATE, &dev->flags) && |
| 1568 | (dev->toread || |
| 1569 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || |
| 1570 | syncing || |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1571 | expanding || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | (failed && (sh->dev[failed_num].toread || |
| 1573 | (sh->dev[failed_num].towrite && !test_bit(R5_OVERWRITE, &sh->dev[failed_num].flags)))) |
| 1574 | ) |
| 1575 | ) { |
| 1576 | /* we would like to get this block, possibly |
| 1577 | * by computing it, but we might not be able to |
| 1578 | */ |
| 1579 | if (uptodate == disks-1) { |
| 1580 | PRINTK("Computing block %d\n", i); |
| 1581 | compute_block(sh, i); |
| 1582 | uptodate++; |
| 1583 | } else if (test_bit(R5_Insync, &dev->flags)) { |
| 1584 | set_bit(R5_LOCKED, &dev->flags); |
| 1585 | set_bit(R5_Wantread, &dev->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | locked++; |
| 1587 | PRINTK("Reading block %d (sync=%d)\n", |
| 1588 | i, syncing); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | } |
| 1590 | } |
| 1591 | } |
| 1592 | set_bit(STRIPE_HANDLE, &sh->state); |
| 1593 | } |
| 1594 | |
| 1595 | /* now to consider writing and what else, if anything should be read */ |
| 1596 | if (to_write) { |
| 1597 | int rmw=0, rcw=0; |
| 1598 | for (i=disks ; i--;) { |
| 1599 | /* would I have to read this buffer for read_modify_write */ |
| 1600 | dev = &sh->dev[i]; |
| 1601 | if ((dev->towrite || i == sh->pd_idx) && |
| 1602 | (!test_bit(R5_LOCKED, &dev->flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | ) && |
| 1604 | !test_bit(R5_UPTODATE, &dev->flags)) { |
| 1605 | if (test_bit(R5_Insync, &dev->flags) |
| 1606 | /* && !(!mddev->insync && i == sh->pd_idx) */ |
| 1607 | ) |
| 1608 | rmw++; |
| 1609 | else rmw += 2*disks; /* cannot read it */ |
| 1610 | } |
| 1611 | /* Would I have to read this buffer for reconstruct_write */ |
| 1612 | if (!test_bit(R5_OVERWRITE, &dev->flags) && i != sh->pd_idx && |
| 1613 | (!test_bit(R5_LOCKED, &dev->flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | ) && |
| 1615 | !test_bit(R5_UPTODATE, &dev->flags)) { |
| 1616 | if (test_bit(R5_Insync, &dev->flags)) rcw++; |
| 1617 | else rcw += 2*disks; |
| 1618 | } |
| 1619 | } |
| 1620 | PRINTK("for sector %llu, rmw=%d rcw=%d\n", |
| 1621 | (unsigned long long)sh->sector, rmw, rcw); |
| 1622 | set_bit(STRIPE_HANDLE, &sh->state); |
| 1623 | if (rmw < rcw && rmw > 0) |
| 1624 | /* prefer read-modify-write, but need to get some data */ |
| 1625 | for (i=disks; i--;) { |
| 1626 | dev = &sh->dev[i]; |
| 1627 | if ((dev->towrite || i == sh->pd_idx) && |
| 1628 | !test_bit(R5_LOCKED, &dev->flags) && !test_bit(R5_UPTODATE, &dev->flags) && |
| 1629 | test_bit(R5_Insync, &dev->flags)) { |
| 1630 | if (test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
| 1631 | { |
| 1632 | PRINTK("Read_old block %d for r-m-w\n", i); |
| 1633 | set_bit(R5_LOCKED, &dev->flags); |
| 1634 | set_bit(R5_Wantread, &dev->flags); |
| 1635 | locked++; |
| 1636 | } else { |
| 1637 | set_bit(STRIPE_DELAYED, &sh->state); |
| 1638 | set_bit(STRIPE_HANDLE, &sh->state); |
| 1639 | } |
| 1640 | } |
| 1641 | } |
| 1642 | if (rcw <= rmw && rcw > 0) |
| 1643 | /* want reconstruct write, but need to get some data */ |
| 1644 | for (i=disks; i--;) { |
| 1645 | dev = &sh->dev[i]; |
| 1646 | if (!test_bit(R5_OVERWRITE, &dev->flags) && i != sh->pd_idx && |
| 1647 | !test_bit(R5_LOCKED, &dev->flags) && !test_bit(R5_UPTODATE, &dev->flags) && |
| 1648 | test_bit(R5_Insync, &dev->flags)) { |
| 1649 | if (test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
| 1650 | { |
| 1651 | PRINTK("Read_old block %d for Reconstruct\n", i); |
| 1652 | set_bit(R5_LOCKED, &dev->flags); |
| 1653 | set_bit(R5_Wantread, &dev->flags); |
| 1654 | locked++; |
| 1655 | } else { |
| 1656 | set_bit(STRIPE_DELAYED, &sh->state); |
| 1657 | set_bit(STRIPE_HANDLE, &sh->state); |
| 1658 | } |
| 1659 | } |
| 1660 | } |
| 1661 | /* now if nothing is locked, and if we have enough data, we can start a write request */ |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1662 | if (locked == 0 && (rcw == 0 ||rmw == 0) && |
| 1663 | !test_bit(STRIPE_BIT_DELAY, &sh->state)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | PRINTK("Computing parity...\n"); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1665 | compute_parity5(sh, rcw==0 ? RECONSTRUCT_WRITE : READ_MODIFY_WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | /* now every locked buffer is ready to be written */ |
| 1667 | for (i=disks; i--;) |
| 1668 | if (test_bit(R5_LOCKED, &sh->dev[i].flags)) { |
| 1669 | PRINTK("Writing block %d\n", i); |
| 1670 | locked++; |
| 1671 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
| 1672 | if (!test_bit(R5_Insync, &sh->dev[i].flags) |
| 1673 | || (i==sh->pd_idx && failed == 0)) |
| 1674 | set_bit(STRIPE_INSYNC, &sh->state); |
| 1675 | } |
| 1676 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { |
| 1677 | atomic_dec(&conf->preread_active_stripes); |
| 1678 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) |
| 1679 | md_wakeup_thread(conf->mddev->thread); |
| 1680 | } |
| 1681 | } |
| 1682 | } |
| 1683 | |
| 1684 | /* maybe we need to check and possibly fix the parity for this stripe |
| 1685 | * Any reads will already have been scheduled, so we just see if enough data |
| 1686 | * is available |
| 1687 | */ |
| 1688 | if (syncing && locked == 0 && |
NeilBrown | 14f8d26 | 2006-01-06 00:20:14 -0800 | [diff] [blame] | 1689 | !test_bit(STRIPE_INSYNC, &sh->state)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | set_bit(STRIPE_HANDLE, &sh->state); |
| 1691 | if (failed == 0) { |
Eric Sesterhenn | 78bafeb | 2006-04-02 13:31:42 +0200 | [diff] [blame] | 1692 | BUG_ON(uptodate != disks); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1693 | compute_parity5(sh, CHECK_PARITY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | uptodate--; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1695 | if (page_is_zero(sh->dev[sh->pd_idx].page)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | /* parity is correct (on disc, not in buffer any more) */ |
| 1697 | set_bit(STRIPE_INSYNC, &sh->state); |
NeilBrown | 9d88883 | 2005-11-08 21:39:26 -0800 | [diff] [blame] | 1698 | } else { |
| 1699 | conf->mddev->resync_mismatches += STRIPE_SECTORS; |
| 1700 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) |
| 1701 | /* don't try to repair!! */ |
| 1702 | set_bit(STRIPE_INSYNC, &sh->state); |
NeilBrown | 14f8d26 | 2006-01-06 00:20:14 -0800 | [diff] [blame] | 1703 | else { |
| 1704 | compute_block(sh, sh->pd_idx); |
| 1705 | uptodate++; |
| 1706 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | } |
| 1708 | } |
| 1709 | if (!test_bit(STRIPE_INSYNC, &sh->state)) { |
NeilBrown | 14f8d26 | 2006-01-06 00:20:14 -0800 | [diff] [blame] | 1710 | /* either failed parity check, or recovery is happening */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | if (failed==0) |
| 1712 | failed_num = sh->pd_idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | dev = &sh->dev[failed_num]; |
NeilBrown | 14f8d26 | 2006-01-06 00:20:14 -0800 | [diff] [blame] | 1714 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
| 1715 | BUG_ON(uptodate != disks); |
| 1716 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | set_bit(R5_LOCKED, &dev->flags); |
| 1718 | set_bit(R5_Wantwrite, &dev->flags); |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1719 | clear_bit(STRIPE_DEGRADED, &sh->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | locked++; |
| 1721 | set_bit(STRIPE_INSYNC, &sh->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | } |
| 1723 | } |
| 1724 | if (syncing && locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
| 1725 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
| 1726 | clear_bit(STRIPE_SYNCING, &sh->state); |
| 1727 | } |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 1728 | |
| 1729 | /* If the failed drive is just a ReadError, then we might need to progress |
| 1730 | * the repair/check process |
| 1731 | */ |
NeilBrown | ba22dcb | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 1732 | if (failed == 1 && ! conf->mddev->ro && |
| 1733 | test_bit(R5_ReadError, &sh->dev[failed_num].flags) |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 1734 | && !test_bit(R5_LOCKED, &sh->dev[failed_num].flags) |
| 1735 | && test_bit(R5_UPTODATE, &sh->dev[failed_num].flags) |
| 1736 | ) { |
| 1737 | dev = &sh->dev[failed_num]; |
| 1738 | if (!test_bit(R5_ReWrite, &dev->flags)) { |
| 1739 | set_bit(R5_Wantwrite, &dev->flags); |
| 1740 | set_bit(R5_ReWrite, &dev->flags); |
| 1741 | set_bit(R5_LOCKED, &dev->flags); |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1742 | locked++; |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 1743 | } else { |
| 1744 | /* let's read it back */ |
| 1745 | set_bit(R5_Wantread, &dev->flags); |
| 1746 | set_bit(R5_LOCKED, &dev->flags); |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1747 | locked++; |
NeilBrown | 4e5314b | 2005-11-08 21:39:22 -0800 | [diff] [blame] | 1748 | } |
| 1749 | } |
| 1750 | |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1751 | if (expanded && test_bit(STRIPE_EXPANDING, &sh->state)) { |
| 1752 | /* Need to write out all blocks after computing parity */ |
| 1753 | sh->disks = conf->raid_disks; |
| 1754 | sh->pd_idx = stripe_to_pdidx(sh->sector, conf, conf->raid_disks); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1755 | compute_parity5(sh, RECONSTRUCT_WRITE); |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1756 | for (i= conf->raid_disks; i--;) { |
| 1757 | set_bit(R5_LOCKED, &sh->dev[i].flags); |
| 1758 | locked++; |
| 1759 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
| 1760 | } |
| 1761 | clear_bit(STRIPE_EXPANDING, &sh->state); |
| 1762 | } else if (expanded) { |
| 1763 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 1764 | atomic_dec(&conf->reshape_stripes); |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1765 | wake_up(&conf->wait_for_overlap); |
| 1766 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); |
| 1767 | } |
| 1768 | |
| 1769 | if (expanding && locked == 0) { |
| 1770 | /* We have read all the blocks in this stripe and now we need to |
| 1771 | * copy some of them into a target stripe for expand. |
| 1772 | */ |
| 1773 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
| 1774 | for (i=0; i< sh->disks; i++) |
| 1775 | if (i != sh->pd_idx) { |
| 1776 | int dd_idx, pd_idx, j; |
| 1777 | struct stripe_head *sh2; |
| 1778 | |
| 1779 | sector_t bn = compute_blocknr(sh, i); |
| 1780 | sector_t s = raid5_compute_sector(bn, conf->raid_disks, |
| 1781 | conf->raid_disks-1, |
| 1782 | &dd_idx, &pd_idx, conf); |
| 1783 | sh2 = get_active_stripe(conf, s, conf->raid_disks, pd_idx, 1); |
| 1784 | if (sh2 == NULL) |
| 1785 | /* so far only the early blocks of this stripe |
| 1786 | * have been requested. When later blocks |
| 1787 | * get requested, we will try again |
| 1788 | */ |
| 1789 | continue; |
| 1790 | if(!test_bit(STRIPE_EXPANDING, &sh2->state) || |
| 1791 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { |
| 1792 | /* must have already done this block */ |
| 1793 | release_stripe(sh2); |
| 1794 | continue; |
| 1795 | } |
| 1796 | memcpy(page_address(sh2->dev[dd_idx].page), |
| 1797 | page_address(sh->dev[i].page), |
| 1798 | STRIPE_SIZE); |
| 1799 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
| 1800 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); |
| 1801 | for (j=0; j<conf->raid_disks; j++) |
| 1802 | if (j != sh2->pd_idx && |
| 1803 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
| 1804 | break; |
| 1805 | if (j == conf->raid_disks) { |
| 1806 | set_bit(STRIPE_EXPAND_READY, &sh2->state); |
| 1807 | set_bit(STRIPE_HANDLE, &sh2->state); |
| 1808 | } |
| 1809 | release_stripe(sh2); |
| 1810 | } |
| 1811 | } |
| 1812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | spin_unlock(&sh->lock); |
| 1814 | |
| 1815 | while ((bi=return_bi)) { |
| 1816 | int bytes = bi->bi_size; |
| 1817 | |
| 1818 | return_bi = bi->bi_next; |
| 1819 | bi->bi_next = NULL; |
| 1820 | bi->bi_size = 0; |
NeilBrown | c2b0085 | 2006-12-10 02:20:51 -0800 | [diff] [blame] | 1821 | bi->bi_end_io(bi, bytes, |
| 1822 | test_bit(BIO_UPTODATE, &bi->bi_flags) |
| 1823 | ? 0 : -EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | } |
| 1825 | for (i=disks; i-- ;) { |
| 1826 | int rw; |
| 1827 | struct bio *bi; |
| 1828 | mdk_rdev_t *rdev; |
| 1829 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) |
NeilBrown | 802ba06 | 2006-12-13 00:34:13 -0800 | [diff] [blame] | 1830 | rw = WRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) |
NeilBrown | 802ba06 | 2006-12-13 00:34:13 -0800 | [diff] [blame] | 1832 | rw = READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | else |
| 1834 | continue; |
| 1835 | |
| 1836 | bi = &sh->dev[i].req; |
| 1837 | |
| 1838 | bi->bi_rw = rw; |
NeilBrown | 802ba06 | 2006-12-13 00:34:13 -0800 | [diff] [blame] | 1839 | if (rw == WRITE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | bi->bi_end_io = raid5_end_write_request; |
| 1841 | else |
| 1842 | bi->bi_end_io = raid5_end_read_request; |
| 1843 | |
| 1844 | rcu_read_lock(); |
Suzanne Wood | d6065f7 | 2005-11-08 21:39:27 -0800 | [diff] [blame] | 1845 | rdev = rcu_dereference(conf->disks[i].rdev); |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 1846 | if (rdev && test_bit(Faulty, &rdev->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | rdev = NULL; |
| 1848 | if (rdev) |
| 1849 | atomic_inc(&rdev->nr_pending); |
| 1850 | rcu_read_unlock(); |
| 1851 | |
| 1852 | if (rdev) { |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 1853 | if (syncing || expanding || expanded) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
| 1855 | |
| 1856 | bi->bi_bdev = rdev->bdev; |
| 1857 | PRINTK("for %llu schedule op %ld on disc %d\n", |
| 1858 | (unsigned long long)sh->sector, bi->bi_rw, i); |
| 1859 | atomic_inc(&sh->count); |
| 1860 | bi->bi_sector = sh->sector + rdev->data_offset; |
| 1861 | bi->bi_flags = 1 << BIO_UPTODATE; |
| 1862 | bi->bi_vcnt = 1; |
| 1863 | bi->bi_max_vecs = 1; |
| 1864 | bi->bi_idx = 0; |
| 1865 | bi->bi_io_vec = &sh->dev[i].vec; |
| 1866 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
| 1867 | bi->bi_io_vec[0].bv_offset = 0; |
| 1868 | bi->bi_size = STRIPE_SIZE; |
| 1869 | bi->bi_next = NULL; |
NeilBrown | 4dbcdc7 | 2006-01-06 00:20:52 -0800 | [diff] [blame] | 1870 | if (rw == WRITE && |
| 1871 | test_bit(R5_ReWrite, &sh->dev[i].flags)) |
| 1872 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | generic_make_request(bi); |
| 1874 | } else { |
NeilBrown | 802ba06 | 2006-12-13 00:34:13 -0800 | [diff] [blame] | 1875 | if (rw == WRITE) |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 1876 | set_bit(STRIPE_DEGRADED, &sh->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | PRINTK("skip op %ld on disc %d for sector %llu\n", |
| 1878 | bi->bi_rw, i, (unsigned long long)sh->sector); |
| 1879 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
| 1880 | set_bit(STRIPE_HANDLE, &sh->state); |
| 1881 | } |
| 1882 | } |
| 1883 | } |
| 1884 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1885 | static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page) |
| 1886 | { |
| 1887 | raid6_conf_t *conf = sh->raid_conf; |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 1888 | int disks = sh->disks; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1889 | struct bio *return_bi= NULL; |
| 1890 | struct bio *bi; |
| 1891 | int i; |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 1892 | int syncing, expanding, expanded; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1893 | int locked=0, uptodate=0, to_read=0, to_write=0, failed=0, written=0; |
| 1894 | int non_overwrite = 0; |
| 1895 | int failed_num[2] = {0, 0}; |
| 1896 | struct r5dev *dev, *pdev, *qdev; |
| 1897 | int pd_idx = sh->pd_idx; |
| 1898 | int qd_idx = raid6_next_disk(pd_idx, disks); |
| 1899 | int p_failed, q_failed; |
| 1900 | |
| 1901 | PRINTK("handling stripe %llu, state=%#lx cnt=%d, pd_idx=%d, qd_idx=%d\n", |
| 1902 | (unsigned long long)sh->sector, sh->state, atomic_read(&sh->count), |
| 1903 | pd_idx, qd_idx); |
| 1904 | |
| 1905 | spin_lock(&sh->lock); |
| 1906 | clear_bit(STRIPE_HANDLE, &sh->state); |
| 1907 | clear_bit(STRIPE_DELAYED, &sh->state); |
| 1908 | |
| 1909 | syncing = test_bit(STRIPE_SYNCING, &sh->state); |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 1910 | expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
| 1911 | expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 1912 | /* Now to look around and see what can be done */ |
| 1913 | |
| 1914 | rcu_read_lock(); |
| 1915 | for (i=disks; i--; ) { |
| 1916 | mdk_rdev_t *rdev; |
| 1917 | dev = &sh->dev[i]; |
| 1918 | clear_bit(R5_Insync, &dev->flags); |
| 1919 | |
| 1920 | PRINTK("check %d: state 0x%lx read %p write %p written %p\n", |
| 1921 | i, dev->flags, dev->toread, dev->towrite, dev->written); |
| 1922 | /* maybe we can reply to a read */ |
| 1923 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread) { |
| 1924 | struct bio *rbi, *rbi2; |
| 1925 | PRINTK("Return read for disc %d\n", i); |
| 1926 | spin_lock_irq(&conf->device_lock); |
| 1927 | rbi = dev->toread; |
| 1928 | dev->toread = NULL; |
| 1929 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) |
| 1930 | wake_up(&conf->wait_for_overlap); |
| 1931 | spin_unlock_irq(&conf->device_lock); |
| 1932 | while (rbi && rbi->bi_sector < dev->sector + STRIPE_SECTORS) { |
| 1933 | copy_data(0, rbi, dev->page, dev->sector); |
| 1934 | rbi2 = r5_next_bio(rbi, dev->sector); |
| 1935 | spin_lock_irq(&conf->device_lock); |
| 1936 | if (--rbi->bi_phys_segments == 0) { |
| 1937 | rbi->bi_next = return_bi; |
| 1938 | return_bi = rbi; |
| 1939 | } |
| 1940 | spin_unlock_irq(&conf->device_lock); |
| 1941 | rbi = rbi2; |
| 1942 | } |
| 1943 | } |
| 1944 | |
| 1945 | /* now count some things */ |
| 1946 | if (test_bit(R5_LOCKED, &dev->flags)) locked++; |
| 1947 | if (test_bit(R5_UPTODATE, &dev->flags)) uptodate++; |
| 1948 | |
| 1949 | |
| 1950 | if (dev->toread) to_read++; |
| 1951 | if (dev->towrite) { |
| 1952 | to_write++; |
| 1953 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
| 1954 | non_overwrite++; |
| 1955 | } |
| 1956 | if (dev->written) written++; |
| 1957 | rdev = rcu_dereference(conf->disks[i].rdev); |
| 1958 | if (!rdev || !test_bit(In_sync, &rdev->flags)) { |
| 1959 | /* The ReadError flag will just be confusing now */ |
| 1960 | clear_bit(R5_ReadError, &dev->flags); |
| 1961 | clear_bit(R5_ReWrite, &dev->flags); |
| 1962 | } |
| 1963 | if (!rdev || !test_bit(In_sync, &rdev->flags) |
| 1964 | || test_bit(R5_ReadError, &dev->flags)) { |
| 1965 | if ( failed < 2 ) |
| 1966 | failed_num[failed] = i; |
| 1967 | failed++; |
| 1968 | } else |
| 1969 | set_bit(R5_Insync, &dev->flags); |
| 1970 | } |
| 1971 | rcu_read_unlock(); |
| 1972 | PRINTK("locked=%d uptodate=%d to_read=%d" |
| 1973 | " to_write=%d failed=%d failed_num=%d,%d\n", |
| 1974 | locked, uptodate, to_read, to_write, failed, |
| 1975 | failed_num[0], failed_num[1]); |
| 1976 | /* check if the array has lost >2 devices and, if so, some requests might |
| 1977 | * need to be failed |
| 1978 | */ |
| 1979 | if (failed > 2 && to_read+to_write+written) { |
| 1980 | for (i=disks; i--; ) { |
| 1981 | int bitmap_end = 0; |
| 1982 | |
| 1983 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
| 1984 | mdk_rdev_t *rdev; |
| 1985 | rcu_read_lock(); |
| 1986 | rdev = rcu_dereference(conf->disks[i].rdev); |
| 1987 | if (rdev && test_bit(In_sync, &rdev->flags)) |
| 1988 | /* multiple read failures in one stripe */ |
| 1989 | md_error(conf->mddev, rdev); |
| 1990 | rcu_read_unlock(); |
| 1991 | } |
| 1992 | |
| 1993 | spin_lock_irq(&conf->device_lock); |
| 1994 | /* fail all writes first */ |
| 1995 | bi = sh->dev[i].towrite; |
| 1996 | sh->dev[i].towrite = NULL; |
| 1997 | if (bi) { to_write--; bitmap_end = 1; } |
| 1998 | |
| 1999 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
| 2000 | wake_up(&conf->wait_for_overlap); |
| 2001 | |
| 2002 | while (bi && bi->bi_sector < sh->dev[i].sector + STRIPE_SECTORS){ |
| 2003 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); |
| 2004 | clear_bit(BIO_UPTODATE, &bi->bi_flags); |
| 2005 | if (--bi->bi_phys_segments == 0) { |
| 2006 | md_write_end(conf->mddev); |
| 2007 | bi->bi_next = return_bi; |
| 2008 | return_bi = bi; |
| 2009 | } |
| 2010 | bi = nextbi; |
| 2011 | } |
| 2012 | /* and fail all 'written' */ |
| 2013 | bi = sh->dev[i].written; |
| 2014 | sh->dev[i].written = NULL; |
| 2015 | if (bi) bitmap_end = 1; |
| 2016 | while (bi && bi->bi_sector < sh->dev[i].sector + STRIPE_SECTORS) { |
| 2017 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); |
| 2018 | clear_bit(BIO_UPTODATE, &bi->bi_flags); |
| 2019 | if (--bi->bi_phys_segments == 0) { |
| 2020 | md_write_end(conf->mddev); |
| 2021 | bi->bi_next = return_bi; |
| 2022 | return_bi = bi; |
| 2023 | } |
| 2024 | bi = bi2; |
| 2025 | } |
| 2026 | |
| 2027 | /* fail any reads if this device is non-operational */ |
| 2028 | if (!test_bit(R5_Insync, &sh->dev[i].flags) || |
| 2029 | test_bit(R5_ReadError, &sh->dev[i].flags)) { |
| 2030 | bi = sh->dev[i].toread; |
| 2031 | sh->dev[i].toread = NULL; |
| 2032 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
| 2033 | wake_up(&conf->wait_for_overlap); |
| 2034 | if (bi) to_read--; |
| 2035 | while (bi && bi->bi_sector < sh->dev[i].sector + STRIPE_SECTORS){ |
| 2036 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); |
| 2037 | clear_bit(BIO_UPTODATE, &bi->bi_flags); |
| 2038 | if (--bi->bi_phys_segments == 0) { |
| 2039 | bi->bi_next = return_bi; |
| 2040 | return_bi = bi; |
| 2041 | } |
| 2042 | bi = nextbi; |
| 2043 | } |
| 2044 | } |
| 2045 | spin_unlock_irq(&conf->device_lock); |
| 2046 | if (bitmap_end) |
| 2047 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
| 2048 | STRIPE_SECTORS, 0, 0); |
| 2049 | } |
| 2050 | } |
| 2051 | if (failed > 2 && syncing) { |
| 2052 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
| 2053 | clear_bit(STRIPE_SYNCING, &sh->state); |
| 2054 | syncing = 0; |
| 2055 | } |
| 2056 | |
| 2057 | /* |
| 2058 | * might be able to return some write requests if the parity blocks |
| 2059 | * are safe, or on a failed drive |
| 2060 | */ |
| 2061 | pdev = &sh->dev[pd_idx]; |
| 2062 | p_failed = (failed >= 1 && failed_num[0] == pd_idx) |
| 2063 | || (failed >= 2 && failed_num[1] == pd_idx); |
| 2064 | qdev = &sh->dev[qd_idx]; |
| 2065 | q_failed = (failed >= 1 && failed_num[0] == qd_idx) |
| 2066 | || (failed >= 2 && failed_num[1] == qd_idx); |
| 2067 | |
| 2068 | if ( written && |
| 2069 | ( p_failed || ((test_bit(R5_Insync, &pdev->flags) |
| 2070 | && !test_bit(R5_LOCKED, &pdev->flags) |
| 2071 | && test_bit(R5_UPTODATE, &pdev->flags))) ) && |
| 2072 | ( q_failed || ((test_bit(R5_Insync, &qdev->flags) |
| 2073 | && !test_bit(R5_LOCKED, &qdev->flags) |
| 2074 | && test_bit(R5_UPTODATE, &qdev->flags))) ) ) { |
| 2075 | /* any written block on an uptodate or failed drive can be |
| 2076 | * returned. Note that if we 'wrote' to a failed drive, |
| 2077 | * it will be UPTODATE, but never LOCKED, so we don't need |
| 2078 | * to test 'failed' directly. |
| 2079 | */ |
| 2080 | for (i=disks; i--; ) |
| 2081 | if (sh->dev[i].written) { |
| 2082 | dev = &sh->dev[i]; |
| 2083 | if (!test_bit(R5_LOCKED, &dev->flags) && |
| 2084 | test_bit(R5_UPTODATE, &dev->flags) ) { |
| 2085 | /* We can return any write requests */ |
| 2086 | int bitmap_end = 0; |
| 2087 | struct bio *wbi, *wbi2; |
| 2088 | PRINTK("Return write for stripe %llu disc %d\n", |
| 2089 | (unsigned long long)sh->sector, i); |
| 2090 | spin_lock_irq(&conf->device_lock); |
| 2091 | wbi = dev->written; |
| 2092 | dev->written = NULL; |
| 2093 | while (wbi && wbi->bi_sector < dev->sector + STRIPE_SECTORS) { |
| 2094 | wbi2 = r5_next_bio(wbi, dev->sector); |
| 2095 | if (--wbi->bi_phys_segments == 0) { |
| 2096 | md_write_end(conf->mddev); |
| 2097 | wbi->bi_next = return_bi; |
| 2098 | return_bi = wbi; |
| 2099 | } |
| 2100 | wbi = wbi2; |
| 2101 | } |
| 2102 | if (dev->towrite == NULL) |
| 2103 | bitmap_end = 1; |
| 2104 | spin_unlock_irq(&conf->device_lock); |
| 2105 | if (bitmap_end) |
| 2106 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
| 2107 | STRIPE_SECTORS, |
| 2108 | !test_bit(STRIPE_DEGRADED, &sh->state), 0); |
| 2109 | } |
| 2110 | } |
| 2111 | } |
| 2112 | |
| 2113 | /* Now we might consider reading some blocks, either to check/generate |
| 2114 | * parity, or to satisfy requests |
| 2115 | * or to load a block that is being partially written. |
| 2116 | */ |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 2117 | if (to_read || non_overwrite || (to_write && failed) || |
| 2118 | (syncing && (uptodate < disks)) || expanding) { |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2119 | for (i=disks; i--;) { |
| 2120 | dev = &sh->dev[i]; |
| 2121 | if (!test_bit(R5_LOCKED, &dev->flags) && !test_bit(R5_UPTODATE, &dev->flags) && |
| 2122 | (dev->toread || |
| 2123 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || |
| 2124 | syncing || |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 2125 | expanding || |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2126 | (failed >= 1 && (sh->dev[failed_num[0]].toread || to_write)) || |
| 2127 | (failed >= 2 && (sh->dev[failed_num[1]].toread || to_write)) |
| 2128 | ) |
| 2129 | ) { |
| 2130 | /* we would like to get this block, possibly |
| 2131 | * by computing it, but we might not be able to |
| 2132 | */ |
| 2133 | if (uptodate == disks-1) { |
| 2134 | PRINTK("Computing stripe %llu block %d\n", |
| 2135 | (unsigned long long)sh->sector, i); |
| 2136 | compute_block_1(sh, i, 0); |
| 2137 | uptodate++; |
| 2138 | } else if ( uptodate == disks-2 && failed >= 2 ) { |
| 2139 | /* Computing 2-failure is *very* expensive; only do it if failed >= 2 */ |
| 2140 | int other; |
| 2141 | for (other=disks; other--;) { |
| 2142 | if ( other == i ) |
| 2143 | continue; |
| 2144 | if ( !test_bit(R5_UPTODATE, &sh->dev[other].flags) ) |
| 2145 | break; |
| 2146 | } |
| 2147 | BUG_ON(other < 0); |
| 2148 | PRINTK("Computing stripe %llu blocks %d,%d\n", |
| 2149 | (unsigned long long)sh->sector, i, other); |
| 2150 | compute_block_2(sh, i, other); |
| 2151 | uptodate += 2; |
| 2152 | } else if (test_bit(R5_Insync, &dev->flags)) { |
| 2153 | set_bit(R5_LOCKED, &dev->flags); |
| 2154 | set_bit(R5_Wantread, &dev->flags); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2155 | locked++; |
| 2156 | PRINTK("Reading block %d (sync=%d)\n", |
| 2157 | i, syncing); |
| 2158 | } |
| 2159 | } |
| 2160 | } |
| 2161 | set_bit(STRIPE_HANDLE, &sh->state); |
| 2162 | } |
| 2163 | |
| 2164 | /* now to consider writing and what else, if anything should be read */ |
| 2165 | if (to_write) { |
| 2166 | int rcw=0, must_compute=0; |
| 2167 | for (i=disks ; i--;) { |
| 2168 | dev = &sh->dev[i]; |
| 2169 | /* Would I have to read this buffer for reconstruct_write */ |
| 2170 | if (!test_bit(R5_OVERWRITE, &dev->flags) |
| 2171 | && i != pd_idx && i != qd_idx |
| 2172 | && (!test_bit(R5_LOCKED, &dev->flags) |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2173 | ) && |
| 2174 | !test_bit(R5_UPTODATE, &dev->flags)) { |
| 2175 | if (test_bit(R5_Insync, &dev->flags)) rcw++; |
| 2176 | else { |
| 2177 | PRINTK("raid6: must_compute: disk %d flags=%#lx\n", i, dev->flags); |
| 2178 | must_compute++; |
| 2179 | } |
| 2180 | } |
| 2181 | } |
| 2182 | PRINTK("for sector %llu, rcw=%d, must_compute=%d\n", |
| 2183 | (unsigned long long)sh->sector, rcw, must_compute); |
| 2184 | set_bit(STRIPE_HANDLE, &sh->state); |
| 2185 | |
| 2186 | if (rcw > 0) |
| 2187 | /* want reconstruct write, but need to get some data */ |
| 2188 | for (i=disks; i--;) { |
| 2189 | dev = &sh->dev[i]; |
| 2190 | if (!test_bit(R5_OVERWRITE, &dev->flags) |
| 2191 | && !(failed == 0 && (i == pd_idx || i == qd_idx)) |
| 2192 | && !test_bit(R5_LOCKED, &dev->flags) && !test_bit(R5_UPTODATE, &dev->flags) && |
| 2193 | test_bit(R5_Insync, &dev->flags)) { |
| 2194 | if (test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
| 2195 | { |
| 2196 | PRINTK("Read_old stripe %llu block %d for Reconstruct\n", |
| 2197 | (unsigned long long)sh->sector, i); |
| 2198 | set_bit(R5_LOCKED, &dev->flags); |
| 2199 | set_bit(R5_Wantread, &dev->flags); |
| 2200 | locked++; |
| 2201 | } else { |
| 2202 | PRINTK("Request delayed stripe %llu block %d for Reconstruct\n", |
| 2203 | (unsigned long long)sh->sector, i); |
| 2204 | set_bit(STRIPE_DELAYED, &sh->state); |
| 2205 | set_bit(STRIPE_HANDLE, &sh->state); |
| 2206 | } |
| 2207 | } |
| 2208 | } |
| 2209 | /* now if nothing is locked, and if we have enough data, we can start a write request */ |
| 2210 | if (locked == 0 && rcw == 0 && |
| 2211 | !test_bit(STRIPE_BIT_DELAY, &sh->state)) { |
| 2212 | if ( must_compute > 0 ) { |
| 2213 | /* We have failed blocks and need to compute them */ |
| 2214 | switch ( failed ) { |
| 2215 | case 0: BUG(); |
| 2216 | case 1: compute_block_1(sh, failed_num[0], 0); break; |
| 2217 | case 2: compute_block_2(sh, failed_num[0], failed_num[1]); break; |
| 2218 | default: BUG(); /* This request should have been failed? */ |
| 2219 | } |
| 2220 | } |
| 2221 | |
| 2222 | PRINTK("Computing parity for stripe %llu\n", (unsigned long long)sh->sector); |
| 2223 | compute_parity6(sh, RECONSTRUCT_WRITE); |
| 2224 | /* now every locked buffer is ready to be written */ |
| 2225 | for (i=disks; i--;) |
| 2226 | if (test_bit(R5_LOCKED, &sh->dev[i].flags)) { |
| 2227 | PRINTK("Writing stripe %llu block %d\n", |
| 2228 | (unsigned long long)sh->sector, i); |
| 2229 | locked++; |
| 2230 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
| 2231 | } |
| 2232 | /* after a RECONSTRUCT_WRITE, the stripe MUST be in-sync */ |
| 2233 | set_bit(STRIPE_INSYNC, &sh->state); |
| 2234 | |
| 2235 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { |
| 2236 | atomic_dec(&conf->preread_active_stripes); |
| 2237 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) |
| 2238 | md_wakeup_thread(conf->mddev->thread); |
| 2239 | } |
| 2240 | } |
| 2241 | } |
| 2242 | |
| 2243 | /* maybe we need to check and possibly fix the parity for this stripe |
| 2244 | * Any reads will already have been scheduled, so we just see if enough data |
| 2245 | * is available |
| 2246 | */ |
| 2247 | if (syncing && locked == 0 && !test_bit(STRIPE_INSYNC, &sh->state)) { |
| 2248 | int update_p = 0, update_q = 0; |
| 2249 | struct r5dev *dev; |
| 2250 | |
| 2251 | set_bit(STRIPE_HANDLE, &sh->state); |
| 2252 | |
| 2253 | BUG_ON(failed>2); |
| 2254 | BUG_ON(uptodate < disks); |
| 2255 | /* Want to check and possibly repair P and Q. |
| 2256 | * However there could be one 'failed' device, in which |
| 2257 | * case we can only check one of them, possibly using the |
| 2258 | * other to generate missing data |
| 2259 | */ |
| 2260 | |
| 2261 | /* If !tmp_page, we cannot do the calculations, |
| 2262 | * but as we have set STRIPE_HANDLE, we will soon be called |
| 2263 | * by stripe_handle with a tmp_page - just wait until then. |
| 2264 | */ |
| 2265 | if (tmp_page) { |
| 2266 | if (failed == q_failed) { |
| 2267 | /* The only possible failed device holds 'Q', so it makes |
| 2268 | * sense to check P (If anything else were failed, we would |
| 2269 | * have used P to recreate it). |
| 2270 | */ |
| 2271 | compute_block_1(sh, pd_idx, 1); |
| 2272 | if (!page_is_zero(sh->dev[pd_idx].page)) { |
| 2273 | compute_block_1(sh,pd_idx,0); |
| 2274 | update_p = 1; |
| 2275 | } |
| 2276 | } |
| 2277 | if (!q_failed && failed < 2) { |
| 2278 | /* q is not failed, and we didn't use it to generate |
| 2279 | * anything, so it makes sense to check it |
| 2280 | */ |
| 2281 | memcpy(page_address(tmp_page), |
| 2282 | page_address(sh->dev[qd_idx].page), |
| 2283 | STRIPE_SIZE); |
| 2284 | compute_parity6(sh, UPDATE_PARITY); |
| 2285 | if (memcmp(page_address(tmp_page), |
| 2286 | page_address(sh->dev[qd_idx].page), |
| 2287 | STRIPE_SIZE)!= 0) { |
| 2288 | clear_bit(STRIPE_INSYNC, &sh->state); |
| 2289 | update_q = 1; |
| 2290 | } |
| 2291 | } |
| 2292 | if (update_p || update_q) { |
| 2293 | conf->mddev->resync_mismatches += STRIPE_SECTORS; |
| 2294 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) |
| 2295 | /* don't try to repair!! */ |
| 2296 | update_p = update_q = 0; |
| 2297 | } |
| 2298 | |
| 2299 | /* now write out any block on a failed drive, |
| 2300 | * or P or Q if they need it |
| 2301 | */ |
| 2302 | |
| 2303 | if (failed == 2) { |
| 2304 | dev = &sh->dev[failed_num[1]]; |
| 2305 | locked++; |
| 2306 | set_bit(R5_LOCKED, &dev->flags); |
| 2307 | set_bit(R5_Wantwrite, &dev->flags); |
| 2308 | } |
| 2309 | if (failed >= 1) { |
| 2310 | dev = &sh->dev[failed_num[0]]; |
| 2311 | locked++; |
| 2312 | set_bit(R5_LOCKED, &dev->flags); |
| 2313 | set_bit(R5_Wantwrite, &dev->flags); |
| 2314 | } |
| 2315 | |
| 2316 | if (update_p) { |
| 2317 | dev = &sh->dev[pd_idx]; |
| 2318 | locked ++; |
| 2319 | set_bit(R5_LOCKED, &dev->flags); |
| 2320 | set_bit(R5_Wantwrite, &dev->flags); |
| 2321 | } |
| 2322 | if (update_q) { |
| 2323 | dev = &sh->dev[qd_idx]; |
| 2324 | locked++; |
| 2325 | set_bit(R5_LOCKED, &dev->flags); |
| 2326 | set_bit(R5_Wantwrite, &dev->flags); |
| 2327 | } |
| 2328 | clear_bit(STRIPE_DEGRADED, &sh->state); |
| 2329 | |
| 2330 | set_bit(STRIPE_INSYNC, &sh->state); |
| 2331 | } |
| 2332 | } |
| 2333 | |
| 2334 | if (syncing && locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
| 2335 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
| 2336 | clear_bit(STRIPE_SYNCING, &sh->state); |
| 2337 | } |
| 2338 | |
| 2339 | /* If the failed drives are just a ReadError, then we might need |
| 2340 | * to progress the repair/check process |
| 2341 | */ |
| 2342 | if (failed <= 2 && ! conf->mddev->ro) |
| 2343 | for (i=0; i<failed;i++) { |
| 2344 | dev = &sh->dev[failed_num[i]]; |
| 2345 | if (test_bit(R5_ReadError, &dev->flags) |
| 2346 | && !test_bit(R5_LOCKED, &dev->flags) |
| 2347 | && test_bit(R5_UPTODATE, &dev->flags) |
| 2348 | ) { |
| 2349 | if (!test_bit(R5_ReWrite, &dev->flags)) { |
| 2350 | set_bit(R5_Wantwrite, &dev->flags); |
| 2351 | set_bit(R5_ReWrite, &dev->flags); |
| 2352 | set_bit(R5_LOCKED, &dev->flags); |
| 2353 | } else { |
| 2354 | /* let's read it back */ |
| 2355 | set_bit(R5_Wantread, &dev->flags); |
| 2356 | set_bit(R5_LOCKED, &dev->flags); |
| 2357 | } |
| 2358 | } |
| 2359 | } |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 2360 | |
| 2361 | if (expanded && test_bit(STRIPE_EXPANDING, &sh->state)) { |
| 2362 | /* Need to write out all blocks after computing P&Q */ |
| 2363 | sh->disks = conf->raid_disks; |
| 2364 | sh->pd_idx = stripe_to_pdidx(sh->sector, conf, |
| 2365 | conf->raid_disks); |
| 2366 | compute_parity6(sh, RECONSTRUCT_WRITE); |
| 2367 | for (i = conf->raid_disks ; i-- ; ) { |
| 2368 | set_bit(R5_LOCKED, &sh->dev[i].flags); |
| 2369 | locked++; |
| 2370 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
| 2371 | } |
| 2372 | clear_bit(STRIPE_EXPANDING, &sh->state); |
| 2373 | } else if (expanded) { |
| 2374 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
| 2375 | atomic_dec(&conf->reshape_stripes); |
| 2376 | wake_up(&conf->wait_for_overlap); |
| 2377 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); |
| 2378 | } |
| 2379 | |
| 2380 | if (expanding && locked == 0) { |
| 2381 | /* We have read all the blocks in this stripe and now we need to |
| 2382 | * copy some of them into a target stripe for expand. |
| 2383 | */ |
| 2384 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
| 2385 | for (i = 0; i < sh->disks ; i++) |
| 2386 | if (i != pd_idx && i != qd_idx) { |
| 2387 | int dd_idx2, pd_idx2, j; |
| 2388 | struct stripe_head *sh2; |
| 2389 | |
| 2390 | sector_t bn = compute_blocknr(sh, i); |
| 2391 | sector_t s = raid5_compute_sector( |
| 2392 | bn, conf->raid_disks, |
| 2393 | conf->raid_disks - conf->max_degraded, |
| 2394 | &dd_idx2, &pd_idx2, conf); |
| 2395 | sh2 = get_active_stripe(conf, s, |
| 2396 | conf->raid_disks, |
| 2397 | pd_idx2, 1); |
| 2398 | if (sh2 == NULL) |
| 2399 | /* so for only the early blocks of |
| 2400 | * this stripe have been requests. |
| 2401 | * When later blocks get requests, we |
| 2402 | * will try again |
| 2403 | */ |
| 2404 | continue; |
| 2405 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || |
| 2406 | test_bit(R5_Expanded, |
| 2407 | &sh2->dev[dd_idx2].flags)) { |
| 2408 | /* must have already done this block */ |
| 2409 | release_stripe(sh2); |
| 2410 | continue; |
| 2411 | } |
| 2412 | memcpy(page_address(sh2->dev[dd_idx2].page), |
| 2413 | page_address(sh->dev[i].page), |
| 2414 | STRIPE_SIZE); |
| 2415 | set_bit(R5_Expanded, &sh2->dev[dd_idx2].flags); |
| 2416 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx2].flags); |
| 2417 | for (j = 0 ; j < conf->raid_disks ; j++) |
| 2418 | if (j != sh2->pd_idx && |
| 2419 | j != raid6_next_disk(sh2->pd_idx, |
| 2420 | sh2->disks) && |
| 2421 | !test_bit(R5_Expanded, |
| 2422 | &sh2->dev[j].flags)) |
| 2423 | break; |
| 2424 | if (j == conf->raid_disks) { |
| 2425 | set_bit(STRIPE_EXPAND_READY, |
| 2426 | &sh2->state); |
| 2427 | set_bit(STRIPE_HANDLE, &sh2->state); |
| 2428 | } |
| 2429 | release_stripe(sh2); |
| 2430 | } |
| 2431 | } |
| 2432 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2433 | spin_unlock(&sh->lock); |
| 2434 | |
| 2435 | while ((bi=return_bi)) { |
| 2436 | int bytes = bi->bi_size; |
| 2437 | |
| 2438 | return_bi = bi->bi_next; |
| 2439 | bi->bi_next = NULL; |
| 2440 | bi->bi_size = 0; |
NeilBrown | c2b0085 | 2006-12-10 02:20:51 -0800 | [diff] [blame] | 2441 | bi->bi_end_io(bi, bytes, |
| 2442 | test_bit(BIO_UPTODATE, &bi->bi_flags) |
| 2443 | ? 0 : -EIO); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2444 | } |
| 2445 | for (i=disks; i-- ;) { |
| 2446 | int rw; |
| 2447 | struct bio *bi; |
| 2448 | mdk_rdev_t *rdev; |
| 2449 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) |
NeilBrown | 802ba06 | 2006-12-13 00:34:13 -0800 | [diff] [blame] | 2450 | rw = WRITE; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2451 | else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) |
NeilBrown | 802ba06 | 2006-12-13 00:34:13 -0800 | [diff] [blame] | 2452 | rw = READ; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2453 | else |
| 2454 | continue; |
| 2455 | |
| 2456 | bi = &sh->dev[i].req; |
| 2457 | |
| 2458 | bi->bi_rw = rw; |
NeilBrown | 802ba06 | 2006-12-13 00:34:13 -0800 | [diff] [blame] | 2459 | if (rw == WRITE) |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2460 | bi->bi_end_io = raid5_end_write_request; |
| 2461 | else |
| 2462 | bi->bi_end_io = raid5_end_read_request; |
| 2463 | |
| 2464 | rcu_read_lock(); |
| 2465 | rdev = rcu_dereference(conf->disks[i].rdev); |
| 2466 | if (rdev && test_bit(Faulty, &rdev->flags)) |
| 2467 | rdev = NULL; |
| 2468 | if (rdev) |
| 2469 | atomic_inc(&rdev->nr_pending); |
| 2470 | rcu_read_unlock(); |
| 2471 | |
| 2472 | if (rdev) { |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 2473 | if (syncing || expanding || expanded) |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2474 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
| 2475 | |
| 2476 | bi->bi_bdev = rdev->bdev; |
| 2477 | PRINTK("for %llu schedule op %ld on disc %d\n", |
| 2478 | (unsigned long long)sh->sector, bi->bi_rw, i); |
| 2479 | atomic_inc(&sh->count); |
| 2480 | bi->bi_sector = sh->sector + rdev->data_offset; |
| 2481 | bi->bi_flags = 1 << BIO_UPTODATE; |
| 2482 | bi->bi_vcnt = 1; |
| 2483 | bi->bi_max_vecs = 1; |
| 2484 | bi->bi_idx = 0; |
| 2485 | bi->bi_io_vec = &sh->dev[i].vec; |
| 2486 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
| 2487 | bi->bi_io_vec[0].bv_offset = 0; |
| 2488 | bi->bi_size = STRIPE_SIZE; |
| 2489 | bi->bi_next = NULL; |
| 2490 | if (rw == WRITE && |
| 2491 | test_bit(R5_ReWrite, &sh->dev[i].flags)) |
| 2492 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); |
| 2493 | generic_make_request(bi); |
| 2494 | } else { |
NeilBrown | 802ba06 | 2006-12-13 00:34:13 -0800 | [diff] [blame] | 2495 | if (rw == WRITE) |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2496 | set_bit(STRIPE_DEGRADED, &sh->state); |
| 2497 | PRINTK("skip op %ld on disc %d for sector %llu\n", |
| 2498 | bi->bi_rw, i, (unsigned long long)sh->sector); |
| 2499 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
| 2500 | set_bit(STRIPE_HANDLE, &sh->state); |
| 2501 | } |
| 2502 | } |
| 2503 | } |
| 2504 | |
| 2505 | static void handle_stripe(struct stripe_head *sh, struct page *tmp_page) |
| 2506 | { |
| 2507 | if (sh->raid_conf->level == 6) |
| 2508 | handle_stripe6(sh, tmp_page); |
| 2509 | else |
| 2510 | handle_stripe5(sh); |
| 2511 | } |
| 2512 | |
| 2513 | |
| 2514 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 2515 | static void raid5_activate_delayed(raid5_conf_t *conf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2516 | { |
| 2517 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { |
| 2518 | while (!list_empty(&conf->delayed_list)) { |
| 2519 | struct list_head *l = conf->delayed_list.next; |
| 2520 | struct stripe_head *sh; |
| 2521 | sh = list_entry(l, struct stripe_head, lru); |
| 2522 | list_del_init(l); |
| 2523 | clear_bit(STRIPE_DELAYED, &sh->state); |
| 2524 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
| 2525 | atomic_inc(&conf->preread_active_stripes); |
| 2526 | list_add_tail(&sh->lru, &conf->handle_list); |
| 2527 | } |
| 2528 | } |
| 2529 | } |
| 2530 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 2531 | static void activate_bit_delay(raid5_conf_t *conf) |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 2532 | { |
| 2533 | /* device_lock is held */ |
| 2534 | struct list_head head; |
| 2535 | list_add(&head, &conf->bitmap_list); |
| 2536 | list_del_init(&conf->bitmap_list); |
| 2537 | while (!list_empty(&head)) { |
| 2538 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); |
| 2539 | list_del_init(&sh->lru); |
| 2540 | atomic_inc(&sh->count); |
| 2541 | __release_stripe(conf, sh); |
| 2542 | } |
| 2543 | } |
| 2544 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2545 | static void unplug_slaves(mddev_t *mddev) |
| 2546 | { |
| 2547 | raid5_conf_t *conf = mddev_to_conf(mddev); |
| 2548 | int i; |
| 2549 | |
| 2550 | rcu_read_lock(); |
| 2551 | for (i=0; i<mddev->raid_disks; i++) { |
Suzanne Wood | d6065f7 | 2005-11-08 21:39:27 -0800 | [diff] [blame] | 2552 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 2553 | if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2554 | request_queue_t *r_queue = bdev_get_queue(rdev->bdev); |
| 2555 | |
| 2556 | atomic_inc(&rdev->nr_pending); |
| 2557 | rcu_read_unlock(); |
| 2558 | |
| 2559 | if (r_queue->unplug_fn) |
| 2560 | r_queue->unplug_fn(r_queue); |
| 2561 | |
| 2562 | rdev_dec_pending(rdev, mddev); |
| 2563 | rcu_read_lock(); |
| 2564 | } |
| 2565 | } |
| 2566 | rcu_read_unlock(); |
| 2567 | } |
| 2568 | |
| 2569 | static void raid5_unplug_device(request_queue_t *q) |
| 2570 | { |
| 2571 | mddev_t *mddev = q->queuedata; |
| 2572 | raid5_conf_t *conf = mddev_to_conf(mddev); |
| 2573 | unsigned long flags; |
| 2574 | |
| 2575 | spin_lock_irqsave(&conf->device_lock, flags); |
| 2576 | |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 2577 | if (blk_remove_plug(q)) { |
| 2578 | conf->seq_flush++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2579 | raid5_activate_delayed(conf); |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 2580 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2581 | md_wakeup_thread(mddev->thread); |
| 2582 | |
| 2583 | spin_unlock_irqrestore(&conf->device_lock, flags); |
| 2584 | |
| 2585 | unplug_slaves(mddev); |
| 2586 | } |
| 2587 | |
| 2588 | static int raid5_issue_flush(request_queue_t *q, struct gendisk *disk, |
| 2589 | sector_t *error_sector) |
| 2590 | { |
| 2591 | mddev_t *mddev = q->queuedata; |
| 2592 | raid5_conf_t *conf = mddev_to_conf(mddev); |
| 2593 | int i, ret = 0; |
| 2594 | |
| 2595 | rcu_read_lock(); |
| 2596 | for (i=0; i<mddev->raid_disks && ret == 0; i++) { |
Suzanne Wood | d6065f7 | 2005-11-08 21:39:27 -0800 | [diff] [blame] | 2597 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 2598 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2599 | struct block_device *bdev = rdev->bdev; |
| 2600 | request_queue_t *r_queue = bdev_get_queue(bdev); |
| 2601 | |
| 2602 | if (!r_queue->issue_flush_fn) |
| 2603 | ret = -EOPNOTSUPP; |
| 2604 | else { |
| 2605 | atomic_inc(&rdev->nr_pending); |
| 2606 | rcu_read_unlock(); |
| 2607 | ret = r_queue->issue_flush_fn(r_queue, bdev->bd_disk, |
| 2608 | error_sector); |
| 2609 | rdev_dec_pending(rdev, mddev); |
| 2610 | rcu_read_lock(); |
| 2611 | } |
| 2612 | } |
| 2613 | } |
| 2614 | rcu_read_unlock(); |
| 2615 | return ret; |
| 2616 | } |
| 2617 | |
NeilBrown | f022b2f | 2006-10-03 01:15:56 -0700 | [diff] [blame] | 2618 | static int raid5_congested(void *data, int bits) |
| 2619 | { |
| 2620 | mddev_t *mddev = data; |
| 2621 | raid5_conf_t *conf = mddev_to_conf(mddev); |
| 2622 | |
| 2623 | /* No difference between reads and writes. Just check |
| 2624 | * how busy the stripe_cache is |
| 2625 | */ |
| 2626 | if (conf->inactive_blocked) |
| 2627 | return 1; |
| 2628 | if (conf->quiesce) |
| 2629 | return 1; |
| 2630 | if (list_empty_careful(&conf->inactive_list)) |
| 2631 | return 1; |
| 2632 | |
| 2633 | return 0; |
| 2634 | } |
| 2635 | |
Raz Ben-Jehuda(caro) | 23032a0 | 2006-12-10 02:20:45 -0800 | [diff] [blame] | 2636 | /* We want read requests to align with chunks where possible, |
| 2637 | * but write requests don't need to. |
| 2638 | */ |
| 2639 | static int raid5_mergeable_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *biovec) |
| 2640 | { |
| 2641 | mddev_t *mddev = q->queuedata; |
| 2642 | sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev); |
| 2643 | int max; |
| 2644 | unsigned int chunk_sectors = mddev->chunk_size >> 9; |
| 2645 | unsigned int bio_sectors = bio->bi_size >> 9; |
| 2646 | |
NeilBrown | 802ba06 | 2006-12-13 00:34:13 -0800 | [diff] [blame] | 2647 | if (bio_data_dir(bio) == WRITE) |
Raz Ben-Jehuda(caro) | 23032a0 | 2006-12-10 02:20:45 -0800 | [diff] [blame] | 2648 | return biovec->bv_len; /* always allow writes to be mergeable */ |
| 2649 | |
| 2650 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; |
| 2651 | if (max < 0) max = 0; |
| 2652 | if (max <= biovec->bv_len && bio_sectors == 0) |
| 2653 | return biovec->bv_len; |
| 2654 | else |
| 2655 | return max; |
| 2656 | } |
| 2657 | |
Raz Ben-Jehuda(caro) | f679623 | 2006-12-10 02:20:46 -0800 | [diff] [blame] | 2658 | |
| 2659 | static int in_chunk_boundary(mddev_t *mddev, struct bio *bio) |
| 2660 | { |
| 2661 | sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev); |
| 2662 | unsigned int chunk_sectors = mddev->chunk_size >> 9; |
| 2663 | unsigned int bio_sectors = bio->bi_size >> 9; |
| 2664 | |
| 2665 | return chunk_sectors >= |
| 2666 | ((sector & (chunk_sectors - 1)) + bio_sectors); |
| 2667 | } |
| 2668 | |
| 2669 | /* |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 2670 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) |
| 2671 | * later sampled by raid5d. |
| 2672 | */ |
| 2673 | static void add_bio_to_retry(struct bio *bi,raid5_conf_t *conf) |
| 2674 | { |
| 2675 | unsigned long flags; |
| 2676 | |
| 2677 | spin_lock_irqsave(&conf->device_lock, flags); |
| 2678 | |
| 2679 | bi->bi_next = conf->retry_read_aligned_list; |
| 2680 | conf->retry_read_aligned_list = bi; |
| 2681 | |
| 2682 | spin_unlock_irqrestore(&conf->device_lock, flags); |
| 2683 | md_wakeup_thread(conf->mddev->thread); |
| 2684 | } |
| 2685 | |
| 2686 | |
| 2687 | static struct bio *remove_bio_from_retry(raid5_conf_t *conf) |
| 2688 | { |
| 2689 | struct bio *bi; |
| 2690 | |
| 2691 | bi = conf->retry_read_aligned; |
| 2692 | if (bi) { |
| 2693 | conf->retry_read_aligned = NULL; |
| 2694 | return bi; |
| 2695 | } |
| 2696 | bi = conf->retry_read_aligned_list; |
| 2697 | if(bi) { |
Neil Brown | 387bb17 | 2007-02-08 14:20:29 -0800 | [diff] [blame] | 2698 | conf->retry_read_aligned_list = bi->bi_next; |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 2699 | bi->bi_next = NULL; |
| 2700 | bi->bi_phys_segments = 1; /* biased count of active stripes */ |
| 2701 | bi->bi_hw_segments = 0; /* count of processed stripes */ |
| 2702 | } |
| 2703 | |
| 2704 | return bi; |
| 2705 | } |
| 2706 | |
| 2707 | |
| 2708 | /* |
Raz Ben-Jehuda(caro) | f679623 | 2006-12-10 02:20:46 -0800 | [diff] [blame] | 2709 | * The "raid5_align_endio" should check if the read succeeded and if it |
| 2710 | * did, call bio_endio on the original bio (having bio_put the new bio |
| 2711 | * first). |
| 2712 | * If the read failed.. |
| 2713 | */ |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 2714 | static int raid5_align_endio(struct bio *bi, unsigned int bytes, int error) |
Raz Ben-Jehuda(caro) | f679623 | 2006-12-10 02:20:46 -0800 | [diff] [blame] | 2715 | { |
| 2716 | struct bio* raid_bi = bi->bi_private; |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 2717 | mddev_t *mddev; |
| 2718 | raid5_conf_t *conf; |
| 2719 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
| 2720 | mdk_rdev_t *rdev; |
| 2721 | |
Raz Ben-Jehuda(caro) | f679623 | 2006-12-10 02:20:46 -0800 | [diff] [blame] | 2722 | if (bi->bi_size) |
| 2723 | return 1; |
| 2724 | bio_put(bi); |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 2725 | |
| 2726 | mddev = raid_bi->bi_bdev->bd_disk->queue->queuedata; |
| 2727 | conf = mddev_to_conf(mddev); |
| 2728 | rdev = (void*)raid_bi->bi_next; |
| 2729 | raid_bi->bi_next = NULL; |
| 2730 | |
| 2731 | rdev_dec_pending(rdev, conf->mddev); |
| 2732 | |
| 2733 | if (!error && uptodate) { |
| 2734 | bio_endio(raid_bi, bytes, 0); |
| 2735 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
| 2736 | wake_up(&conf->wait_for_stripe); |
| 2737 | return 0; |
| 2738 | } |
| 2739 | |
| 2740 | |
| 2741 | PRINTK("raid5_align_endio : io error...handing IO for a retry\n"); |
| 2742 | |
| 2743 | add_bio_to_retry(raid_bi, conf); |
Raz Ben-Jehuda(caro) | f679623 | 2006-12-10 02:20:46 -0800 | [diff] [blame] | 2744 | return 0; |
| 2745 | } |
| 2746 | |
Neil Brown | 387bb17 | 2007-02-08 14:20:29 -0800 | [diff] [blame] | 2747 | static int bio_fits_rdev(struct bio *bi) |
| 2748 | { |
| 2749 | request_queue_t *q = bdev_get_queue(bi->bi_bdev); |
| 2750 | |
| 2751 | if ((bi->bi_size>>9) > q->max_sectors) |
| 2752 | return 0; |
| 2753 | blk_recount_segments(q, bi); |
| 2754 | if (bi->bi_phys_segments > q->max_phys_segments || |
| 2755 | bi->bi_hw_segments > q->max_hw_segments) |
| 2756 | return 0; |
| 2757 | |
| 2758 | if (q->merge_bvec_fn) |
| 2759 | /* it's too hard to apply the merge_bvec_fn at this stage, |
| 2760 | * just just give up |
| 2761 | */ |
| 2762 | return 0; |
| 2763 | |
| 2764 | return 1; |
| 2765 | } |
| 2766 | |
| 2767 | |
Raz Ben-Jehuda(caro) | f679623 | 2006-12-10 02:20:46 -0800 | [diff] [blame] | 2768 | static int chunk_aligned_read(request_queue_t *q, struct bio * raid_bio) |
| 2769 | { |
| 2770 | mddev_t *mddev = q->queuedata; |
| 2771 | raid5_conf_t *conf = mddev_to_conf(mddev); |
| 2772 | const unsigned int raid_disks = conf->raid_disks; |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 2773 | const unsigned int data_disks = raid_disks - conf->max_degraded; |
Raz Ben-Jehuda(caro) | f679623 | 2006-12-10 02:20:46 -0800 | [diff] [blame] | 2774 | unsigned int dd_idx, pd_idx; |
| 2775 | struct bio* align_bi; |
| 2776 | mdk_rdev_t *rdev; |
| 2777 | |
| 2778 | if (!in_chunk_boundary(mddev, raid_bio)) { |
NeilBrown | c20086d | 2007-01-26 00:57:14 -0800 | [diff] [blame] | 2779 | PRINTK("chunk_aligned_read : non aligned\n"); |
Raz Ben-Jehuda(caro) | f679623 | 2006-12-10 02:20:46 -0800 | [diff] [blame] | 2780 | return 0; |
| 2781 | } |
| 2782 | /* |
| 2783 | * use bio_clone to make a copy of the bio |
| 2784 | */ |
| 2785 | align_bi = bio_clone(raid_bio, GFP_NOIO); |
| 2786 | if (!align_bi) |
| 2787 | return 0; |
| 2788 | /* |
| 2789 | * set bi_end_io to a new function, and set bi_private to the |
| 2790 | * original bio. |
| 2791 | */ |
| 2792 | align_bi->bi_end_io = raid5_align_endio; |
| 2793 | align_bi->bi_private = raid_bio; |
| 2794 | /* |
| 2795 | * compute position |
| 2796 | */ |
| 2797 | align_bi->bi_sector = raid5_compute_sector(raid_bio->bi_sector, |
| 2798 | raid_disks, |
| 2799 | data_disks, |
| 2800 | &dd_idx, |
| 2801 | &pd_idx, |
| 2802 | conf); |
| 2803 | |
| 2804 | rcu_read_lock(); |
| 2805 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); |
| 2806 | if (rdev && test_bit(In_sync, &rdev->flags)) { |
Raz Ben-Jehuda(caro) | f679623 | 2006-12-10 02:20:46 -0800 | [diff] [blame] | 2807 | atomic_inc(&rdev->nr_pending); |
| 2808 | rcu_read_unlock(); |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 2809 | raid_bio->bi_next = (void*)rdev; |
| 2810 | align_bi->bi_bdev = rdev->bdev; |
| 2811 | align_bi->bi_flags &= ~(1 << BIO_SEG_VALID); |
| 2812 | align_bi->bi_sector += rdev->data_offset; |
| 2813 | |
Neil Brown | 387bb17 | 2007-02-08 14:20:29 -0800 | [diff] [blame] | 2814 | if (!bio_fits_rdev(align_bi)) { |
| 2815 | /* too big in some way */ |
| 2816 | bio_put(align_bi); |
| 2817 | rdev_dec_pending(rdev, mddev); |
| 2818 | return 0; |
| 2819 | } |
| 2820 | |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 2821 | spin_lock_irq(&conf->device_lock); |
| 2822 | wait_event_lock_irq(conf->wait_for_stripe, |
| 2823 | conf->quiesce == 0, |
| 2824 | conf->device_lock, /* nothing */); |
| 2825 | atomic_inc(&conf->active_aligned_reads); |
| 2826 | spin_unlock_irq(&conf->device_lock); |
| 2827 | |
Raz Ben-Jehuda(caro) | f679623 | 2006-12-10 02:20:46 -0800 | [diff] [blame] | 2828 | generic_make_request(align_bi); |
| 2829 | return 1; |
| 2830 | } else { |
| 2831 | rcu_read_unlock(); |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 2832 | bio_put(align_bi); |
Raz Ben-Jehuda(caro) | f679623 | 2006-12-10 02:20:46 -0800 | [diff] [blame] | 2833 | return 0; |
| 2834 | } |
| 2835 | } |
| 2836 | |
| 2837 | |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 2838 | static int make_request(request_queue_t *q, struct bio * bi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2839 | { |
| 2840 | mddev_t *mddev = q->queuedata; |
| 2841 | raid5_conf_t *conf = mddev_to_conf(mddev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2842 | unsigned int dd_idx, pd_idx; |
| 2843 | sector_t new_sector; |
| 2844 | sector_t logical_sector, last_sector; |
| 2845 | struct stripe_head *sh; |
Jens Axboe | a362357 | 2005-11-01 09:26:16 +0100 | [diff] [blame] | 2846 | const int rw = bio_data_dir(bi); |
NeilBrown | f634475 | 2006-03-27 01:18:17 -0800 | [diff] [blame] | 2847 | int remaining; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2848 | |
NeilBrown | e5dcdd8 | 2005-09-09 16:23:41 -0700 | [diff] [blame] | 2849 | if (unlikely(bio_barrier(bi))) { |
| 2850 | bio_endio(bi, bi->bi_size, -EOPNOTSUPP); |
| 2851 | return 0; |
| 2852 | } |
| 2853 | |
NeilBrown | 3d310eb | 2005-06-21 17:17:26 -0700 | [diff] [blame] | 2854 | md_write_start(mddev, bi); |
NeilBrown | 06d91a5 | 2005-06-21 17:17:12 -0700 | [diff] [blame] | 2855 | |
Jens Axboe | a362357 | 2005-11-01 09:26:16 +0100 | [diff] [blame] | 2856 | disk_stat_inc(mddev->gendisk, ios[rw]); |
| 2857 | disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bi)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2858 | |
NeilBrown | 802ba06 | 2006-12-13 00:34:13 -0800 | [diff] [blame] | 2859 | if (rw == READ && |
Raz Ben-Jehuda(caro) | 5248861 | 2006-12-10 02:20:48 -0800 | [diff] [blame] | 2860 | mddev->reshape_position == MaxSector && |
| 2861 | chunk_aligned_read(q,bi)) |
| 2862 | return 0; |
| 2863 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2864 | logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
| 2865 | last_sector = bi->bi_sector + (bi->bi_size>>9); |
| 2866 | bi->bi_next = NULL; |
| 2867 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ |
NeilBrown | 06d91a5 | 2005-06-21 17:17:12 -0700 | [diff] [blame] | 2868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2869 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
| 2870 | DEFINE_WAIT(w); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2871 | int disks, data_disks; |
NeilBrown | b578d55 | 2006-03-27 01:18:12 -0800 | [diff] [blame] | 2872 | |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 2873 | retry: |
NeilBrown | b578d55 | 2006-03-27 01:18:12 -0800 | [diff] [blame] | 2874 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 2875 | if (likely(conf->expand_progress == MaxSector)) |
| 2876 | disks = conf->raid_disks; |
| 2877 | else { |
NeilBrown | df8e7f7 | 2006-03-27 01:18:15 -0800 | [diff] [blame] | 2878 | /* spinlock is needed as expand_progress may be |
| 2879 | * 64bit on a 32bit platform, and so it might be |
| 2880 | * possible to see a half-updated value |
| 2881 | * Ofcourse expand_progress could change after |
| 2882 | * the lock is dropped, so once we get a reference |
| 2883 | * to the stripe that we think it is, we will have |
| 2884 | * to check again. |
| 2885 | */ |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 2886 | spin_lock_irq(&conf->device_lock); |
| 2887 | disks = conf->raid_disks; |
| 2888 | if (logical_sector >= conf->expand_progress) |
| 2889 | disks = conf->previous_raid_disks; |
NeilBrown | b578d55 | 2006-03-27 01:18:12 -0800 | [diff] [blame] | 2890 | else { |
| 2891 | if (logical_sector >= conf->expand_lo) { |
| 2892 | spin_unlock_irq(&conf->device_lock); |
| 2893 | schedule(); |
| 2894 | goto retry; |
| 2895 | } |
| 2896 | } |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 2897 | spin_unlock_irq(&conf->device_lock); |
| 2898 | } |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2899 | data_disks = disks - conf->max_degraded; |
| 2900 | |
| 2901 | new_sector = raid5_compute_sector(logical_sector, disks, data_disks, |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 2902 | &dd_idx, &pd_idx, conf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2903 | PRINTK("raid5: make_request, sector %llu logical %llu\n", |
| 2904 | (unsigned long long)new_sector, |
| 2905 | (unsigned long long)logical_sector); |
| 2906 | |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 2907 | sh = get_active_stripe(conf, new_sector, disks, pd_idx, (bi->bi_rw&RWA_MASK)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2908 | if (sh) { |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 2909 | if (unlikely(conf->expand_progress != MaxSector)) { |
| 2910 | /* expansion might have moved on while waiting for a |
NeilBrown | df8e7f7 | 2006-03-27 01:18:15 -0800 | [diff] [blame] | 2911 | * stripe, so we must do the range check again. |
| 2912 | * Expansion could still move past after this |
| 2913 | * test, but as we are holding a reference to |
| 2914 | * 'sh', we know that if that happens, |
| 2915 | * STRIPE_EXPANDING will get set and the expansion |
| 2916 | * won't proceed until we finish with the stripe. |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 2917 | */ |
| 2918 | int must_retry = 0; |
| 2919 | spin_lock_irq(&conf->device_lock); |
| 2920 | if (logical_sector < conf->expand_progress && |
| 2921 | disks == conf->previous_raid_disks) |
| 2922 | /* mismatch, need to try again */ |
| 2923 | must_retry = 1; |
| 2924 | spin_unlock_irq(&conf->device_lock); |
| 2925 | if (must_retry) { |
| 2926 | release_stripe(sh); |
| 2927 | goto retry; |
| 2928 | } |
| 2929 | } |
NeilBrown | e464eaf | 2006-03-27 01:18:14 -0800 | [diff] [blame] | 2930 | /* FIXME what if we get a false positive because these |
| 2931 | * are being updated. |
| 2932 | */ |
| 2933 | if (logical_sector >= mddev->suspend_lo && |
| 2934 | logical_sector < mddev->suspend_hi) { |
| 2935 | release_stripe(sh); |
| 2936 | schedule(); |
| 2937 | goto retry; |
| 2938 | } |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 2939 | |
| 2940 | if (test_bit(STRIPE_EXPANDING, &sh->state) || |
| 2941 | !add_stripe_bio(sh, bi, dd_idx, (bi->bi_rw&RW_MASK))) { |
| 2942 | /* Stripe is busy expanding or |
| 2943 | * add failed due to overlap. Flush everything |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2944 | * and wait a while |
| 2945 | */ |
| 2946 | raid5_unplug_device(mddev->queue); |
| 2947 | release_stripe(sh); |
| 2948 | schedule(); |
| 2949 | goto retry; |
| 2950 | } |
| 2951 | finish_wait(&conf->wait_for_overlap, &w); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2952 | handle_stripe(sh, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2953 | release_stripe(sh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2954 | } else { |
| 2955 | /* cannot get stripe for read-ahead, just give-up */ |
| 2956 | clear_bit(BIO_UPTODATE, &bi->bi_flags); |
| 2957 | finish_wait(&conf->wait_for_overlap, &w); |
| 2958 | break; |
| 2959 | } |
| 2960 | |
| 2961 | } |
| 2962 | spin_lock_irq(&conf->device_lock); |
NeilBrown | f634475 | 2006-03-27 01:18:17 -0800 | [diff] [blame] | 2963 | remaining = --bi->bi_phys_segments; |
| 2964 | spin_unlock_irq(&conf->device_lock); |
| 2965 | if (remaining == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2966 | int bytes = bi->bi_size; |
| 2967 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 2968 | if ( rw == WRITE ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2969 | md_write_end(mddev); |
| 2970 | bi->bi_size = 0; |
NeilBrown | c2b0085 | 2006-12-10 02:20:51 -0800 | [diff] [blame] | 2971 | bi->bi_end_io(bi, bytes, |
| 2972 | test_bit(BIO_UPTODATE, &bi->bi_flags) |
| 2973 | ? 0 : -EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2974 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2975 | return 0; |
| 2976 | } |
| 2977 | |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 2978 | static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2979 | { |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 2980 | /* reshaping is quite different to recovery/resync so it is |
| 2981 | * handled quite separately ... here. |
| 2982 | * |
| 2983 | * On each call to sync_request, we gather one chunk worth of |
| 2984 | * destination stripes and flag them as expanding. |
| 2985 | * Then we find all the source stripes and request reads. |
| 2986 | * As the reads complete, handle_stripe will copy the data |
| 2987 | * into the destination stripe and release that stripe. |
| 2988 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2989 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; |
| 2990 | struct stripe_head *sh; |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 2991 | int pd_idx; |
| 2992 | sector_t first_sector, last_sector; |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 2993 | int raid_disks = conf->previous_raid_disks; |
| 2994 | int data_disks = raid_disks - conf->max_degraded; |
| 2995 | int new_data_disks = conf->raid_disks - conf->max_degraded; |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 2996 | int i; |
| 2997 | int dd_idx; |
| 2998 | sector_t writepos, safepos, gap; |
| 2999 | |
| 3000 | if (sector_nr == 0 && |
| 3001 | conf->expand_progress != 0) { |
| 3002 | /* restarting in the middle, skip the initial sectors */ |
| 3003 | sector_nr = conf->expand_progress; |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3004 | sector_div(sector_nr, new_data_disks); |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3005 | *skipped = 1; |
| 3006 | return sector_nr; |
| 3007 | } |
| 3008 | |
| 3009 | /* we update the metadata when there is more than 3Meg |
| 3010 | * in the block range (that is rather arbitrary, should |
| 3011 | * probably be time based) or when the data about to be |
| 3012 | * copied would over-write the source of the data at |
| 3013 | * the front of the range. |
| 3014 | * i.e. one new_stripe forward from expand_progress new_maps |
| 3015 | * to after where expand_lo old_maps to |
| 3016 | */ |
| 3017 | writepos = conf->expand_progress + |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3018 | conf->chunk_size/512*(new_data_disks); |
| 3019 | sector_div(writepos, new_data_disks); |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3020 | safepos = conf->expand_lo; |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3021 | sector_div(safepos, data_disks); |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3022 | gap = conf->expand_progress - conf->expand_lo; |
| 3023 | |
| 3024 | if (writepos >= safepos || |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3025 | gap > (new_data_disks)*3000*2 /*3Meg*/) { |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3026 | /* Cannot proceed until we've updated the superblock... */ |
| 3027 | wait_event(conf->wait_for_overlap, |
| 3028 | atomic_read(&conf->reshape_stripes)==0); |
| 3029 | mddev->reshape_position = conf->expand_progress; |
NeilBrown | 850b2b4 | 2006-10-03 01:15:46 -0700 | [diff] [blame] | 3030 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3031 | md_wakeup_thread(mddev->thread); |
NeilBrown | 850b2b4 | 2006-10-03 01:15:46 -0700 | [diff] [blame] | 3032 | wait_event(mddev->sb_wait, mddev->flags == 0 || |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3033 | kthread_should_stop()); |
| 3034 | spin_lock_irq(&conf->device_lock); |
| 3035 | conf->expand_lo = mddev->reshape_position; |
| 3036 | spin_unlock_irq(&conf->device_lock); |
| 3037 | wake_up(&conf->wait_for_overlap); |
| 3038 | } |
| 3039 | |
| 3040 | for (i=0; i < conf->chunk_size/512; i+= STRIPE_SECTORS) { |
| 3041 | int j; |
| 3042 | int skipped = 0; |
| 3043 | pd_idx = stripe_to_pdidx(sector_nr+i, conf, conf->raid_disks); |
| 3044 | sh = get_active_stripe(conf, sector_nr+i, |
| 3045 | conf->raid_disks, pd_idx, 0); |
| 3046 | set_bit(STRIPE_EXPANDING, &sh->state); |
| 3047 | atomic_inc(&conf->reshape_stripes); |
| 3048 | /* If any of this stripe is beyond the end of the old |
| 3049 | * array, then we need to zero those blocks |
| 3050 | */ |
| 3051 | for (j=sh->disks; j--;) { |
| 3052 | sector_t s; |
| 3053 | if (j == sh->pd_idx) |
| 3054 | continue; |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3055 | if (conf->level == 6 && |
| 3056 | j == raid6_next_disk(sh->pd_idx, sh->disks)) |
| 3057 | continue; |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3058 | s = compute_blocknr(sh, j); |
| 3059 | if (s < (mddev->array_size<<1)) { |
| 3060 | skipped = 1; |
| 3061 | continue; |
| 3062 | } |
| 3063 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); |
| 3064 | set_bit(R5_Expanded, &sh->dev[j].flags); |
| 3065 | set_bit(R5_UPTODATE, &sh->dev[j].flags); |
| 3066 | } |
| 3067 | if (!skipped) { |
| 3068 | set_bit(STRIPE_EXPAND_READY, &sh->state); |
| 3069 | set_bit(STRIPE_HANDLE, &sh->state); |
| 3070 | } |
| 3071 | release_stripe(sh); |
| 3072 | } |
| 3073 | spin_lock_irq(&conf->device_lock); |
NeilBrown | 6d3baf2 | 2007-03-05 00:30:44 -0800 | [diff] [blame] | 3074 | conf->expand_progress = (sector_nr + i) * new_data_disks; |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3075 | spin_unlock_irq(&conf->device_lock); |
| 3076 | /* Ok, those stripe are ready. We can start scheduling |
| 3077 | * reads on the source stripes. |
| 3078 | * The source stripes are determined by mapping the first and last |
| 3079 | * block on the destination stripes. |
| 3080 | */ |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3081 | first_sector = |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3082 | raid5_compute_sector(sector_nr*(new_data_disks), |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3083 | raid_disks, data_disks, |
| 3084 | &dd_idx, &pd_idx, conf); |
| 3085 | last_sector = |
| 3086 | raid5_compute_sector((sector_nr+conf->chunk_size/512) |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3087 | *(new_data_disks) -1, |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3088 | raid_disks, data_disks, |
| 3089 | &dd_idx, &pd_idx, conf); |
| 3090 | if (last_sector >= (mddev->size<<1)) |
| 3091 | last_sector = (mddev->size<<1)-1; |
| 3092 | while (first_sector <= last_sector) { |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3093 | pd_idx = stripe_to_pdidx(first_sector, conf, |
| 3094 | conf->previous_raid_disks); |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3095 | sh = get_active_stripe(conf, first_sector, |
| 3096 | conf->previous_raid_disks, pd_idx, 0); |
| 3097 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
| 3098 | set_bit(STRIPE_HANDLE, &sh->state); |
| 3099 | release_stripe(sh); |
| 3100 | first_sector += STRIPE_SECTORS; |
| 3101 | } |
| 3102 | return conf->chunk_size>>9; |
| 3103 | } |
| 3104 | |
| 3105 | /* FIXME go_faster isn't used */ |
| 3106 | static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) |
| 3107 | { |
| 3108 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; |
| 3109 | struct stripe_head *sh; |
| 3110 | int pd_idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3111 | int raid_disks = conf->raid_disks; |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 3112 | sector_t max_sector = mddev->size << 1; |
| 3113 | int sync_blocks; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3114 | int still_degraded = 0; |
| 3115 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3116 | |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 3117 | if (sector_nr >= max_sector) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3118 | /* just being told to finish up .. nothing much to do */ |
| 3119 | unplug_slaves(mddev); |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3120 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
| 3121 | end_reshape(conf); |
| 3122 | return 0; |
| 3123 | } |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 3124 | |
| 3125 | if (mddev->curr_resync < max_sector) /* aborted */ |
| 3126 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, |
| 3127 | &sync_blocks, 1); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3128 | else /* completed sync */ |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 3129 | conf->fullsync = 0; |
| 3130 | bitmap_close_sync(mddev->bitmap); |
| 3131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3132 | return 0; |
| 3133 | } |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 3134 | |
NeilBrown | 52c0329 | 2006-06-26 00:27:43 -0700 | [diff] [blame] | 3135 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
| 3136 | return reshape_request(mddev, sector_nr, skipped); |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3137 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3138 | /* if there is too many failed drives and we are trying |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3139 | * to resync, then assert that we are finished, because there is |
| 3140 | * nothing we can do. |
| 3141 | */ |
NeilBrown | 3285edf | 2006-06-26 00:27:55 -0700 | [diff] [blame] | 3142 | if (mddev->degraded >= conf->max_degraded && |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3143 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
NeilBrown | 57afd89 | 2005-06-21 17:17:13 -0700 | [diff] [blame] | 3144 | sector_t rv = (mddev->size << 1) - sector_nr; |
| 3145 | *skipped = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3146 | return rv; |
| 3147 | } |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 3148 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
NeilBrown | 3855ad9 | 2005-11-08 21:39:38 -0800 | [diff] [blame] | 3149 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 3150 | !conf->fullsync && sync_blocks >= STRIPE_SECTORS) { |
| 3151 | /* we can skip this block, and probably more */ |
| 3152 | sync_blocks /= STRIPE_SECTORS; |
| 3153 | *skipped = 1; |
| 3154 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ |
| 3155 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3156 | |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 3157 | pd_idx = stripe_to_pdidx(sector_nr, conf, raid_disks); |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 3158 | sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3159 | if (sh == NULL) { |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 3160 | sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3161 | /* make sure we don't swamp the stripe cache if someone else |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3162 | * is trying to get access |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3163 | */ |
Nishanth Aravamudan | 66c006a | 2005-11-07 01:01:17 -0800 | [diff] [blame] | 3164 | schedule_timeout_uninterruptible(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3165 | } |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3166 | /* Need to check if array will still be degraded after recovery/resync |
| 3167 | * We don't need to check the 'failed' flag as when that gets set, |
| 3168 | * recovery aborts. |
| 3169 | */ |
| 3170 | for (i=0; i<mddev->raid_disks; i++) |
| 3171 | if (conf->disks[i].rdev == NULL) |
| 3172 | still_degraded = 1; |
| 3173 | |
| 3174 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); |
| 3175 | |
| 3176 | spin_lock(&sh->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3177 | set_bit(STRIPE_SYNCING, &sh->state); |
| 3178 | clear_bit(STRIPE_INSYNC, &sh->state); |
| 3179 | spin_unlock(&sh->lock); |
| 3180 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3181 | handle_stripe(sh, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3182 | release_stripe(sh); |
| 3183 | |
| 3184 | return STRIPE_SECTORS; |
| 3185 | } |
| 3186 | |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 3187 | static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) |
| 3188 | { |
| 3189 | /* We may not be able to submit a whole bio at once as there |
| 3190 | * may not be enough stripe_heads available. |
| 3191 | * We cannot pre-allocate enough stripe_heads as we may need |
| 3192 | * more than exist in the cache (if we allow ever large chunks). |
| 3193 | * So we do one stripe head at a time and record in |
| 3194 | * ->bi_hw_segments how many have been done. |
| 3195 | * |
| 3196 | * We *know* that this entire raid_bio is in one chunk, so |
| 3197 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. |
| 3198 | */ |
| 3199 | struct stripe_head *sh; |
| 3200 | int dd_idx, pd_idx; |
| 3201 | sector_t sector, logical_sector, last_sector; |
| 3202 | int scnt = 0; |
| 3203 | int remaining; |
| 3204 | int handled = 0; |
| 3205 | |
| 3206 | logical_sector = raid_bio->bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
| 3207 | sector = raid5_compute_sector( logical_sector, |
| 3208 | conf->raid_disks, |
| 3209 | conf->raid_disks - conf->max_degraded, |
| 3210 | &dd_idx, |
| 3211 | &pd_idx, |
| 3212 | conf); |
| 3213 | last_sector = raid_bio->bi_sector + (raid_bio->bi_size>>9); |
| 3214 | |
| 3215 | for (; logical_sector < last_sector; |
Neil Brown | 387bb17 | 2007-02-08 14:20:29 -0800 | [diff] [blame] | 3216 | logical_sector += STRIPE_SECTORS, |
| 3217 | sector += STRIPE_SECTORS, |
| 3218 | scnt++) { |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 3219 | |
| 3220 | if (scnt < raid_bio->bi_hw_segments) |
| 3221 | /* already done this stripe */ |
| 3222 | continue; |
| 3223 | |
| 3224 | sh = get_active_stripe(conf, sector, conf->raid_disks, pd_idx, 1); |
| 3225 | |
| 3226 | if (!sh) { |
| 3227 | /* failed to get a stripe - must wait */ |
| 3228 | raid_bio->bi_hw_segments = scnt; |
| 3229 | conf->retry_read_aligned = raid_bio; |
| 3230 | return handled; |
| 3231 | } |
| 3232 | |
| 3233 | set_bit(R5_ReadError, &sh->dev[dd_idx].flags); |
Neil Brown | 387bb17 | 2007-02-08 14:20:29 -0800 | [diff] [blame] | 3234 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) { |
| 3235 | release_stripe(sh); |
| 3236 | raid_bio->bi_hw_segments = scnt; |
| 3237 | conf->retry_read_aligned = raid_bio; |
| 3238 | return handled; |
| 3239 | } |
| 3240 | |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 3241 | handle_stripe(sh, NULL); |
| 3242 | release_stripe(sh); |
| 3243 | handled++; |
| 3244 | } |
| 3245 | spin_lock_irq(&conf->device_lock); |
| 3246 | remaining = --raid_bio->bi_phys_segments; |
| 3247 | spin_unlock_irq(&conf->device_lock); |
| 3248 | if (remaining == 0) { |
| 3249 | int bytes = raid_bio->bi_size; |
| 3250 | |
| 3251 | raid_bio->bi_size = 0; |
NeilBrown | c2b0085 | 2006-12-10 02:20:51 -0800 | [diff] [blame] | 3252 | raid_bio->bi_end_io(raid_bio, bytes, |
| 3253 | test_bit(BIO_UPTODATE, &raid_bio->bi_flags) |
| 3254 | ? 0 : -EIO); |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 3255 | } |
| 3256 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
| 3257 | wake_up(&conf->wait_for_stripe); |
| 3258 | return handled; |
| 3259 | } |
| 3260 | |
| 3261 | |
| 3262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3263 | /* |
| 3264 | * This is our raid5 kernel thread. |
| 3265 | * |
| 3266 | * We scan the hash table for stripes which can be handled now. |
| 3267 | * During the scan, completed stripes are saved for us by the interrupt |
| 3268 | * handler, so that they will not have to wait for our next wakeup. |
| 3269 | */ |
| 3270 | static void raid5d (mddev_t *mddev) |
| 3271 | { |
| 3272 | struct stripe_head *sh; |
| 3273 | raid5_conf_t *conf = mddev_to_conf(mddev); |
| 3274 | int handled; |
| 3275 | |
| 3276 | PRINTK("+++ raid5d active\n"); |
| 3277 | |
| 3278 | md_check_recovery(mddev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3279 | |
| 3280 | handled = 0; |
| 3281 | spin_lock_irq(&conf->device_lock); |
| 3282 | while (1) { |
| 3283 | struct list_head *first; |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 3284 | struct bio *bio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3285 | |
NeilBrown | ae3c20c | 2006-07-10 04:44:17 -0700 | [diff] [blame] | 3286 | if (conf->seq_flush != conf->seq_write) { |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 3287 | int seq = conf->seq_flush; |
NeilBrown | 700e432 | 2005-11-28 13:44:10 -0800 | [diff] [blame] | 3288 | spin_unlock_irq(&conf->device_lock); |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 3289 | bitmap_unplug(mddev->bitmap); |
NeilBrown | 700e432 | 2005-11-28 13:44:10 -0800 | [diff] [blame] | 3290 | spin_lock_irq(&conf->device_lock); |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 3291 | conf->seq_write = seq; |
| 3292 | activate_bit_delay(conf); |
| 3293 | } |
| 3294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3295 | if (list_empty(&conf->handle_list) && |
| 3296 | atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD && |
| 3297 | !blk_queue_plugged(mddev->queue) && |
| 3298 | !list_empty(&conf->delayed_list)) |
| 3299 | raid5_activate_delayed(conf); |
| 3300 | |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 3301 | while ((bio = remove_bio_from_retry(conf))) { |
| 3302 | int ok; |
| 3303 | spin_unlock_irq(&conf->device_lock); |
| 3304 | ok = retry_aligned_read(conf, bio); |
| 3305 | spin_lock_irq(&conf->device_lock); |
| 3306 | if (!ok) |
| 3307 | break; |
| 3308 | handled++; |
| 3309 | } |
| 3310 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3311 | if (list_empty(&conf->handle_list)) |
| 3312 | break; |
| 3313 | |
| 3314 | first = conf->handle_list.next; |
| 3315 | sh = list_entry(first, struct stripe_head, lru); |
| 3316 | |
| 3317 | list_del_init(first); |
| 3318 | atomic_inc(&sh->count); |
Eric Sesterhenn | 78bafeb | 2006-04-02 13:31:42 +0200 | [diff] [blame] | 3319 | BUG_ON(atomic_read(&sh->count)!= 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3320 | spin_unlock_irq(&conf->device_lock); |
| 3321 | |
| 3322 | handled++; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3323 | handle_stripe(sh, conf->spare_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3324 | release_stripe(sh); |
| 3325 | |
| 3326 | spin_lock_irq(&conf->device_lock); |
| 3327 | } |
| 3328 | PRINTK("%d stripes handled\n", handled); |
| 3329 | |
| 3330 | spin_unlock_irq(&conf->device_lock); |
| 3331 | |
| 3332 | unplug_slaves(mddev); |
| 3333 | |
| 3334 | PRINTK("--- raid5d inactive\n"); |
| 3335 | } |
| 3336 | |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3337 | static ssize_t |
NeilBrown | 007583c | 2005-11-08 21:39:30 -0800 | [diff] [blame] | 3338 | raid5_show_stripe_cache_size(mddev_t *mddev, char *page) |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3339 | { |
NeilBrown | 007583c | 2005-11-08 21:39:30 -0800 | [diff] [blame] | 3340 | raid5_conf_t *conf = mddev_to_conf(mddev); |
NeilBrown | 96de1e6 | 2005-11-08 21:39:39 -0800 | [diff] [blame] | 3341 | if (conf) |
| 3342 | return sprintf(page, "%d\n", conf->max_nr_stripes); |
| 3343 | else |
| 3344 | return 0; |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3345 | } |
| 3346 | |
| 3347 | static ssize_t |
NeilBrown | 007583c | 2005-11-08 21:39:30 -0800 | [diff] [blame] | 3348 | raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len) |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3349 | { |
NeilBrown | 007583c | 2005-11-08 21:39:30 -0800 | [diff] [blame] | 3350 | raid5_conf_t *conf = mddev_to_conf(mddev); |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3351 | char *end; |
| 3352 | int new; |
| 3353 | if (len >= PAGE_SIZE) |
| 3354 | return -EINVAL; |
NeilBrown | 96de1e6 | 2005-11-08 21:39:39 -0800 | [diff] [blame] | 3355 | if (!conf) |
| 3356 | return -ENODEV; |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3357 | |
| 3358 | new = simple_strtoul(page, &end, 10); |
| 3359 | if (!*page || (*end && *end != '\n') ) |
| 3360 | return -EINVAL; |
| 3361 | if (new <= 16 || new > 32768) |
| 3362 | return -EINVAL; |
| 3363 | while (new < conf->max_nr_stripes) { |
| 3364 | if (drop_one_stripe(conf)) |
| 3365 | conf->max_nr_stripes--; |
| 3366 | else |
| 3367 | break; |
| 3368 | } |
NeilBrown | 2a2275d | 2007-01-26 00:57:11 -0800 | [diff] [blame] | 3369 | md_allow_write(mddev); |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3370 | while (new > conf->max_nr_stripes) { |
| 3371 | if (grow_one_stripe(conf)) |
| 3372 | conf->max_nr_stripes++; |
| 3373 | else break; |
| 3374 | } |
| 3375 | return len; |
| 3376 | } |
NeilBrown | 007583c | 2005-11-08 21:39:30 -0800 | [diff] [blame] | 3377 | |
NeilBrown | 96de1e6 | 2005-11-08 21:39:39 -0800 | [diff] [blame] | 3378 | static struct md_sysfs_entry |
| 3379 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, |
| 3380 | raid5_show_stripe_cache_size, |
| 3381 | raid5_store_stripe_cache_size); |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3382 | |
| 3383 | static ssize_t |
NeilBrown | 96de1e6 | 2005-11-08 21:39:39 -0800 | [diff] [blame] | 3384 | stripe_cache_active_show(mddev_t *mddev, char *page) |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3385 | { |
NeilBrown | 007583c | 2005-11-08 21:39:30 -0800 | [diff] [blame] | 3386 | raid5_conf_t *conf = mddev_to_conf(mddev); |
NeilBrown | 96de1e6 | 2005-11-08 21:39:39 -0800 | [diff] [blame] | 3387 | if (conf) |
| 3388 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); |
| 3389 | else |
| 3390 | return 0; |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3391 | } |
| 3392 | |
NeilBrown | 96de1e6 | 2005-11-08 21:39:39 -0800 | [diff] [blame] | 3393 | static struct md_sysfs_entry |
| 3394 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3395 | |
NeilBrown | 007583c | 2005-11-08 21:39:30 -0800 | [diff] [blame] | 3396 | static struct attribute *raid5_attrs[] = { |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3397 | &raid5_stripecache_size.attr, |
| 3398 | &raid5_stripecache_active.attr, |
| 3399 | NULL, |
| 3400 | }; |
NeilBrown | 007583c | 2005-11-08 21:39:30 -0800 | [diff] [blame] | 3401 | static struct attribute_group raid5_attrs_group = { |
| 3402 | .name = NULL, |
| 3403 | .attrs = raid5_attrs, |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3404 | }; |
| 3405 | |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 3406 | static int run(mddev_t *mddev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3407 | { |
| 3408 | raid5_conf_t *conf; |
| 3409 | int raid_disk, memory; |
| 3410 | mdk_rdev_t *rdev; |
| 3411 | struct disk_info *disk; |
| 3412 | struct list_head *tmp; |
NeilBrown | 02c2de8 | 2006-10-03 01:15:47 -0700 | [diff] [blame] | 3413 | int working_disks = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3414 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3415 | if (mddev->level != 5 && mddev->level != 4 && mddev->level != 6) { |
| 3416 | printk(KERN_ERR "raid5: %s: raid level not set to 4/5/6 (%d)\n", |
NeilBrown | 14f8d26 | 2006-01-06 00:20:14 -0800 | [diff] [blame] | 3417 | mdname(mddev), mddev->level); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3418 | return -EIO; |
| 3419 | } |
| 3420 | |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3421 | if (mddev->reshape_position != MaxSector) { |
| 3422 | /* Check that we can continue the reshape. |
| 3423 | * Currently only disks can change, it must |
| 3424 | * increase, and we must be past the point where |
| 3425 | * a stripe over-writes itself |
| 3426 | */ |
| 3427 | sector_t here_new, here_old; |
| 3428 | int old_disks; |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3429 | int max_degraded = (mddev->level == 5 ? 1 : 2); |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3430 | |
| 3431 | if (mddev->new_level != mddev->level || |
| 3432 | mddev->new_layout != mddev->layout || |
| 3433 | mddev->new_chunk != mddev->chunk_size) { |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3434 | printk(KERN_ERR "raid5: %s: unsupported reshape " |
| 3435 | "required - aborting.\n", |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3436 | mdname(mddev)); |
| 3437 | return -EINVAL; |
| 3438 | } |
| 3439 | if (mddev->delta_disks <= 0) { |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3440 | printk(KERN_ERR "raid5: %s: unsupported reshape " |
| 3441 | "(reduce disks) required - aborting.\n", |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3442 | mdname(mddev)); |
| 3443 | return -EINVAL; |
| 3444 | } |
| 3445 | old_disks = mddev->raid_disks - mddev->delta_disks; |
| 3446 | /* reshape_position must be on a new-stripe boundary, and one |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3447 | * further up in new geometry must map after here in old |
| 3448 | * geometry. |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3449 | */ |
| 3450 | here_new = mddev->reshape_position; |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3451 | if (sector_div(here_new, (mddev->chunk_size>>9)* |
| 3452 | (mddev->raid_disks - max_degraded))) { |
| 3453 | printk(KERN_ERR "raid5: reshape_position not " |
| 3454 | "on a stripe boundary\n"); |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3455 | return -EINVAL; |
| 3456 | } |
| 3457 | /* here_new is the stripe we will write to */ |
| 3458 | here_old = mddev->reshape_position; |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3459 | sector_div(here_old, (mddev->chunk_size>>9)* |
| 3460 | (old_disks-max_degraded)); |
| 3461 | /* here_old is the first stripe that we might need to read |
| 3462 | * from */ |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3463 | if (here_new >= here_old) { |
| 3464 | /* Reading from the same stripe as writing to - bad */ |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3465 | printk(KERN_ERR "raid5: reshape_position too early for " |
| 3466 | "auto-recovery - aborting.\n"); |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3467 | return -EINVAL; |
| 3468 | } |
| 3469 | printk(KERN_INFO "raid5: reshape will continue\n"); |
| 3470 | /* OK, we should be able to continue; */ |
| 3471 | } |
| 3472 | |
| 3473 | |
NeilBrown | b55e6bf | 2006-03-27 01:18:06 -0800 | [diff] [blame] | 3474 | mddev->private = kzalloc(sizeof (raid5_conf_t), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3475 | if ((conf = mddev->private) == NULL) |
| 3476 | goto abort; |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3477 | if (mddev->reshape_position == MaxSector) { |
| 3478 | conf->previous_raid_disks = conf->raid_disks = mddev->raid_disks; |
| 3479 | } else { |
| 3480 | conf->raid_disks = mddev->raid_disks; |
| 3481 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; |
| 3482 | } |
| 3483 | |
| 3484 | conf->disks = kzalloc(conf->raid_disks * sizeof(struct disk_info), |
NeilBrown | b55e6bf | 2006-03-27 01:18:06 -0800 | [diff] [blame] | 3485 | GFP_KERNEL); |
| 3486 | if (!conf->disks) |
| 3487 | goto abort; |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 3488 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3489 | conf->mddev = mddev; |
| 3490 | |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 3491 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3492 | goto abort; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3493 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3494 | if (mddev->level == 6) { |
| 3495 | conf->spare_page = alloc_page(GFP_KERNEL); |
| 3496 | if (!conf->spare_page) |
| 3497 | goto abort; |
| 3498 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3499 | spin_lock_init(&conf->device_lock); |
| 3500 | init_waitqueue_head(&conf->wait_for_stripe); |
| 3501 | init_waitqueue_head(&conf->wait_for_overlap); |
| 3502 | INIT_LIST_HEAD(&conf->handle_list); |
| 3503 | INIT_LIST_HEAD(&conf->delayed_list); |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 3504 | INIT_LIST_HEAD(&conf->bitmap_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3505 | INIT_LIST_HEAD(&conf->inactive_list); |
| 3506 | atomic_set(&conf->active_stripes, 0); |
| 3507 | atomic_set(&conf->preread_active_stripes, 0); |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 3508 | atomic_set(&conf->active_aligned_reads, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3510 | PRINTK("raid5: run(%s) called.\n", mdname(mddev)); |
| 3511 | |
| 3512 | ITERATE_RDEV(mddev,rdev,tmp) { |
| 3513 | raid_disk = rdev->raid_disk; |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3514 | if (raid_disk >= conf->raid_disks |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3515 | || raid_disk < 0) |
| 3516 | continue; |
| 3517 | disk = conf->disks + raid_disk; |
| 3518 | |
| 3519 | disk->rdev = rdev; |
| 3520 | |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 3521 | if (test_bit(In_sync, &rdev->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3522 | char b[BDEVNAME_SIZE]; |
| 3523 | printk(KERN_INFO "raid5: device %s operational as raid" |
| 3524 | " disk %d\n", bdevname(rdev->bdev,b), |
| 3525 | raid_disk); |
NeilBrown | 02c2de8 | 2006-10-03 01:15:47 -0700 | [diff] [blame] | 3526 | working_disks++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3527 | } |
| 3528 | } |
| 3529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3530 | /* |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3531 | * 0 for a fully functional array, 1 or 2 for a degraded array. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3532 | */ |
NeilBrown | 02c2de8 | 2006-10-03 01:15:47 -0700 | [diff] [blame] | 3533 | mddev->degraded = conf->raid_disks - working_disks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3534 | conf->mddev = mddev; |
| 3535 | conf->chunk_size = mddev->chunk_size; |
| 3536 | conf->level = mddev->level; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3537 | if (conf->level == 6) |
| 3538 | conf->max_degraded = 2; |
| 3539 | else |
| 3540 | conf->max_degraded = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3541 | conf->algorithm = mddev->layout; |
| 3542 | conf->max_nr_stripes = NR_STRIPES; |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3543 | conf->expand_progress = mddev->reshape_position; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3544 | |
| 3545 | /* device size must be a multiple of chunk size */ |
| 3546 | mddev->size &= ~(mddev->chunk_size/1024 -1); |
NeilBrown | b158156 | 2005-07-31 22:34:50 -0700 | [diff] [blame] | 3547 | mddev->resync_max_sectors = mddev->size << 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3548 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3549 | if (conf->level == 6 && conf->raid_disks < 4) { |
| 3550 | printk(KERN_ERR "raid6: not enough configured devices for %s (%d, minimum 4)\n", |
| 3551 | mdname(mddev), conf->raid_disks); |
| 3552 | goto abort; |
| 3553 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3554 | if (!conf->chunk_size || conf->chunk_size % 4) { |
| 3555 | printk(KERN_ERR "raid5: invalid chunk size %d for %s\n", |
| 3556 | conf->chunk_size, mdname(mddev)); |
| 3557 | goto abort; |
| 3558 | } |
| 3559 | if (conf->algorithm > ALGORITHM_RIGHT_SYMMETRIC) { |
| 3560 | printk(KERN_ERR |
| 3561 | "raid5: unsupported parity algorithm %d for %s\n", |
| 3562 | conf->algorithm, mdname(mddev)); |
| 3563 | goto abort; |
| 3564 | } |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3565 | if (mddev->degraded > conf->max_degraded) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3566 | printk(KERN_ERR "raid5: not enough operational devices for %s" |
| 3567 | " (%d/%d failed)\n", |
NeilBrown | 02c2de8 | 2006-10-03 01:15:47 -0700 | [diff] [blame] | 3568 | mdname(mddev), mddev->degraded, conf->raid_disks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3569 | goto abort; |
| 3570 | } |
| 3571 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3572 | if (mddev->degraded > 0 && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3573 | mddev->recovery_cp != MaxSector) { |
NeilBrown | 6ff8d8e | 2006-01-06 00:20:15 -0800 | [diff] [blame] | 3574 | if (mddev->ok_start_degraded) |
| 3575 | printk(KERN_WARNING |
| 3576 | "raid5: starting dirty degraded array: %s" |
| 3577 | "- data corruption possible.\n", |
| 3578 | mdname(mddev)); |
| 3579 | else { |
| 3580 | printk(KERN_ERR |
| 3581 | "raid5: cannot start dirty degraded array for %s\n", |
| 3582 | mdname(mddev)); |
| 3583 | goto abort; |
| 3584 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3585 | } |
| 3586 | |
| 3587 | { |
| 3588 | mddev->thread = md_register_thread(raid5d, mddev, "%s_raid5"); |
| 3589 | if (!mddev->thread) { |
| 3590 | printk(KERN_ERR |
| 3591 | "raid5: couldn't allocate thread for %s\n", |
| 3592 | mdname(mddev)); |
| 3593 | goto abort; |
| 3594 | } |
| 3595 | } |
NeilBrown | 5036805 | 2005-12-12 02:39:17 -0800 | [diff] [blame] | 3596 | memory = conf->max_nr_stripes * (sizeof(struct stripe_head) + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3597 | conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
| 3598 | if (grow_stripes(conf, conf->max_nr_stripes)) { |
| 3599 | printk(KERN_ERR |
| 3600 | "raid5: couldn't allocate %dkB for buffers\n", memory); |
| 3601 | shrink_stripes(conf); |
| 3602 | md_unregister_thread(mddev->thread); |
| 3603 | goto abort; |
| 3604 | } else |
| 3605 | printk(KERN_INFO "raid5: allocated %dkB for %s\n", |
| 3606 | memory, mdname(mddev)); |
| 3607 | |
| 3608 | if (mddev->degraded == 0) |
| 3609 | printk("raid5: raid level %d set %s active with %d out of %d" |
| 3610 | " devices, algorithm %d\n", conf->level, mdname(mddev), |
| 3611 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, |
| 3612 | conf->algorithm); |
| 3613 | else |
| 3614 | printk(KERN_ALERT "raid5: raid level %d set %s active with %d" |
| 3615 | " out of %d devices, algorithm %d\n", conf->level, |
| 3616 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
| 3617 | mddev->raid_disks, conf->algorithm); |
| 3618 | |
| 3619 | print_raid5_conf(conf); |
| 3620 | |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3621 | if (conf->expand_progress != MaxSector) { |
| 3622 | printk("...ok start reshape thread\n"); |
NeilBrown | b578d55 | 2006-03-27 01:18:12 -0800 | [diff] [blame] | 3623 | conf->expand_lo = conf->expand_progress; |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3624 | atomic_set(&conf->reshape_stripes, 0); |
| 3625 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
| 3626 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
| 3627 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
| 3628 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
| 3629 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, |
| 3630 | "%s_reshape"); |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3631 | } |
| 3632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3633 | /* read-ahead size must cover two whole stripes, which is |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3634 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3635 | */ |
| 3636 | { |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3637 | int data_disks = conf->previous_raid_disks - conf->max_degraded; |
| 3638 | int stripe = data_disks * |
NeilBrown | 8932c2e | 2006-06-26 00:27:36 -0700 | [diff] [blame] | 3639 | (mddev->chunk_size / PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3640 | if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
| 3641 | mddev->queue->backing_dev_info.ra_pages = 2 * stripe; |
| 3642 | } |
| 3643 | |
| 3644 | /* Ok, everything is just fine now */ |
NeilBrown | 5e55e2f | 2007-03-26 21:32:14 -0800 | [diff] [blame^] | 3645 | if (sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) |
| 3646 | printk(KERN_WARNING |
| 3647 | "raid5: failed to create sysfs attributes for %s\n", |
| 3648 | mdname(mddev)); |
NeilBrown | 7a5febe | 2005-05-16 21:53:16 -0700 | [diff] [blame] | 3649 | |
| 3650 | mddev->queue->unplug_fn = raid5_unplug_device; |
| 3651 | mddev->queue->issue_flush_fn = raid5_issue_flush; |
NeilBrown | f022b2f | 2006-10-03 01:15:56 -0700 | [diff] [blame] | 3652 | mddev->queue->backing_dev_info.congested_data = mddev; |
NeilBrown | 041ae52 | 2007-03-26 21:32:14 -0800 | [diff] [blame] | 3653 | mddev->queue->backing_dev_info.congested_fn = raid5_congested; |
NeilBrown | f022b2f | 2006-10-03 01:15:56 -0700 | [diff] [blame] | 3654 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3655 | mddev->array_size = mddev->size * (conf->previous_raid_disks - |
| 3656 | conf->max_degraded); |
NeilBrown | 7a5febe | 2005-05-16 21:53:16 -0700 | [diff] [blame] | 3657 | |
Raz Ben-Jehuda(caro) | 23032a0 | 2006-12-10 02:20:45 -0800 | [diff] [blame] | 3658 | blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); |
| 3659 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3660 | return 0; |
| 3661 | abort: |
| 3662 | if (conf) { |
| 3663 | print_raid5_conf(conf); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3664 | safe_put_page(conf->spare_page); |
NeilBrown | b55e6bf | 2006-03-27 01:18:06 -0800 | [diff] [blame] | 3665 | kfree(conf->disks); |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 3666 | kfree(conf->stripe_hashtbl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3667 | kfree(conf); |
| 3668 | } |
| 3669 | mddev->private = NULL; |
| 3670 | printk(KERN_ALERT "raid5: failed to run raid set %s\n", mdname(mddev)); |
| 3671 | return -EIO; |
| 3672 | } |
| 3673 | |
| 3674 | |
| 3675 | |
NeilBrown | 3f294f4 | 2005-11-08 21:39:25 -0800 | [diff] [blame] | 3676 | static int stop(mddev_t *mddev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3677 | { |
| 3678 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; |
| 3679 | |
| 3680 | md_unregister_thread(mddev->thread); |
| 3681 | mddev->thread = NULL; |
| 3682 | shrink_stripes(conf); |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 3683 | kfree(conf->stripe_hashtbl); |
NeilBrown | 041ae52 | 2007-03-26 21:32:14 -0800 | [diff] [blame] | 3684 | mddev->queue->backing_dev_info.congested_fn = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3685 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ |
NeilBrown | 007583c | 2005-11-08 21:39:30 -0800 | [diff] [blame] | 3686 | sysfs_remove_group(&mddev->kobj, &raid5_attrs_group); |
NeilBrown | b55e6bf | 2006-03-27 01:18:06 -0800 | [diff] [blame] | 3687 | kfree(conf->disks); |
NeilBrown | 96de1e6 | 2005-11-08 21:39:39 -0800 | [diff] [blame] | 3688 | kfree(conf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3689 | mddev->private = NULL; |
| 3690 | return 0; |
| 3691 | } |
| 3692 | |
| 3693 | #if RAID5_DEBUG |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3694 | static void print_sh (struct seq_file *seq, struct stripe_head *sh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3695 | { |
| 3696 | int i; |
| 3697 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3698 | seq_printf(seq, "sh %llu, pd_idx %d, state %ld.\n", |
| 3699 | (unsigned long long)sh->sector, sh->pd_idx, sh->state); |
| 3700 | seq_printf(seq, "sh %llu, count %d.\n", |
| 3701 | (unsigned long long)sh->sector, atomic_read(&sh->count)); |
| 3702 | seq_printf(seq, "sh %llu, ", (unsigned long long)sh->sector); |
NeilBrown | 7ecaa1e | 2006-03-27 01:18:08 -0800 | [diff] [blame] | 3703 | for (i = 0; i < sh->disks; i++) { |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3704 | seq_printf(seq, "(cache%d: %p %ld) ", |
| 3705 | i, sh->dev[i].page, sh->dev[i].flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3706 | } |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3707 | seq_printf(seq, "\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3708 | } |
| 3709 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3710 | static void printall (struct seq_file *seq, raid5_conf_t *conf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3711 | { |
| 3712 | struct stripe_head *sh; |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 3713 | struct hlist_node *hn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3714 | int i; |
| 3715 | |
| 3716 | spin_lock_irq(&conf->device_lock); |
| 3717 | for (i = 0; i < NR_HASH; i++) { |
NeilBrown | fccddba | 2006-01-06 00:20:33 -0800 | [diff] [blame] | 3718 | hlist_for_each_entry(sh, hn, &conf->stripe_hashtbl[i], hash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3719 | if (sh->raid_conf != conf) |
| 3720 | continue; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3721 | print_sh(seq, sh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3722 | } |
| 3723 | } |
| 3724 | spin_unlock_irq(&conf->device_lock); |
| 3725 | } |
| 3726 | #endif |
| 3727 | |
| 3728 | static void status (struct seq_file *seq, mddev_t *mddev) |
| 3729 | { |
| 3730 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; |
| 3731 | int i; |
| 3732 | |
| 3733 | seq_printf (seq, " level %d, %dk chunk, algorithm %d", mddev->level, mddev->chunk_size >> 10, mddev->layout); |
NeilBrown | 02c2de8 | 2006-10-03 01:15:47 -0700 | [diff] [blame] | 3734 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3735 | for (i = 0; i < conf->raid_disks; i++) |
| 3736 | seq_printf (seq, "%s", |
| 3737 | conf->disks[i].rdev && |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 3738 | test_bit(In_sync, &conf->disks[i].rdev->flags) ? "U" : "_"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3739 | seq_printf (seq, "]"); |
| 3740 | #if RAID5_DEBUG |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3741 | seq_printf (seq, "\n"); |
| 3742 | printall(seq, conf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3743 | #endif |
| 3744 | } |
| 3745 | |
| 3746 | static void print_raid5_conf (raid5_conf_t *conf) |
| 3747 | { |
| 3748 | int i; |
| 3749 | struct disk_info *tmp; |
| 3750 | |
| 3751 | printk("RAID5 conf printout:\n"); |
| 3752 | if (!conf) { |
| 3753 | printk("(conf==NULL)\n"); |
| 3754 | return; |
| 3755 | } |
NeilBrown | 02c2de8 | 2006-10-03 01:15:47 -0700 | [diff] [blame] | 3756 | printk(" --- rd:%d wd:%d\n", conf->raid_disks, |
| 3757 | conf->raid_disks - conf->mddev->degraded); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3758 | |
| 3759 | for (i = 0; i < conf->raid_disks; i++) { |
| 3760 | char b[BDEVNAME_SIZE]; |
| 3761 | tmp = conf->disks + i; |
| 3762 | if (tmp->rdev) |
| 3763 | printk(" disk %d, o:%d, dev:%s\n", |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 3764 | i, !test_bit(Faulty, &tmp->rdev->flags), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3765 | bdevname(tmp->rdev->bdev,b)); |
| 3766 | } |
| 3767 | } |
| 3768 | |
| 3769 | static int raid5_spare_active(mddev_t *mddev) |
| 3770 | { |
| 3771 | int i; |
| 3772 | raid5_conf_t *conf = mddev->private; |
| 3773 | struct disk_info *tmp; |
| 3774 | |
| 3775 | for (i = 0; i < conf->raid_disks; i++) { |
| 3776 | tmp = conf->disks + i; |
| 3777 | if (tmp->rdev |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 3778 | && !test_bit(Faulty, &tmp->rdev->flags) |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 3779 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
| 3780 | unsigned long flags; |
| 3781 | spin_lock_irqsave(&conf->device_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3782 | mddev->degraded--; |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 3783 | spin_unlock_irqrestore(&conf->device_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3784 | } |
| 3785 | } |
| 3786 | print_raid5_conf(conf); |
| 3787 | return 0; |
| 3788 | } |
| 3789 | |
| 3790 | static int raid5_remove_disk(mddev_t *mddev, int number) |
| 3791 | { |
| 3792 | raid5_conf_t *conf = mddev->private; |
| 3793 | int err = 0; |
| 3794 | mdk_rdev_t *rdev; |
| 3795 | struct disk_info *p = conf->disks + number; |
| 3796 | |
| 3797 | print_raid5_conf(conf); |
| 3798 | rdev = p->rdev; |
| 3799 | if (rdev) { |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 3800 | if (test_bit(In_sync, &rdev->flags) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3801 | atomic_read(&rdev->nr_pending)) { |
| 3802 | err = -EBUSY; |
| 3803 | goto abort; |
| 3804 | } |
| 3805 | p->rdev = NULL; |
Paul E. McKenney | fbd568a3e | 2005-05-01 08:59:04 -0700 | [diff] [blame] | 3806 | synchronize_rcu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3807 | if (atomic_read(&rdev->nr_pending)) { |
| 3808 | /* lost the race, try later */ |
| 3809 | err = -EBUSY; |
| 3810 | p->rdev = rdev; |
| 3811 | } |
| 3812 | } |
| 3813 | abort: |
| 3814 | |
| 3815 | print_raid5_conf(conf); |
| 3816 | return err; |
| 3817 | } |
| 3818 | |
| 3819 | static int raid5_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) |
| 3820 | { |
| 3821 | raid5_conf_t *conf = mddev->private; |
| 3822 | int found = 0; |
| 3823 | int disk; |
| 3824 | struct disk_info *p; |
| 3825 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3826 | if (mddev->degraded > conf->max_degraded) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3827 | /* no point adding a device */ |
| 3828 | return 0; |
| 3829 | |
| 3830 | /* |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3831 | * find the disk ... but prefer rdev->saved_raid_disk |
| 3832 | * if possible. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3833 | */ |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3834 | if (rdev->saved_raid_disk >= 0 && |
| 3835 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
| 3836 | disk = rdev->saved_raid_disk; |
| 3837 | else |
| 3838 | disk = 0; |
| 3839 | for ( ; disk < conf->raid_disks; disk++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3840 | if ((p=conf->disks + disk)->rdev == NULL) { |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 3841 | clear_bit(In_sync, &rdev->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3842 | rdev->raid_disk = disk; |
| 3843 | found = 1; |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 3844 | if (rdev->saved_raid_disk != disk) |
| 3845 | conf->fullsync = 1; |
Suzanne Wood | d6065f7 | 2005-11-08 21:39:27 -0800 | [diff] [blame] | 3846 | rcu_assign_pointer(p->rdev, rdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3847 | break; |
| 3848 | } |
| 3849 | print_raid5_conf(conf); |
| 3850 | return found; |
| 3851 | } |
| 3852 | |
| 3853 | static int raid5_resize(mddev_t *mddev, sector_t sectors) |
| 3854 | { |
| 3855 | /* no resync is happening, and there is enough space |
| 3856 | * on all devices, so we can resize. |
| 3857 | * We need to make sure resync covers any new space. |
| 3858 | * If the array is shrinking we should possibly wait until |
| 3859 | * any io in the removed space completes, but it hardly seems |
| 3860 | * worth it. |
| 3861 | */ |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3862 | raid5_conf_t *conf = mddev_to_conf(mddev); |
| 3863 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3864 | sectors &= ~((sector_t)mddev->chunk_size/512 - 1); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 3865 | mddev->array_size = (sectors * (mddev->raid_disks-conf->max_degraded))>>1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3866 | set_capacity(mddev->gendisk, mddev->array_size << 1); |
| 3867 | mddev->changed = 1; |
| 3868 | if (sectors/2 > mddev->size && mddev->recovery_cp == MaxSector) { |
| 3869 | mddev->recovery_cp = mddev->size << 1; |
| 3870 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 3871 | } |
| 3872 | mddev->size = sectors /2; |
NeilBrown | 4b5c7ae | 2005-07-27 11:43:28 -0700 | [diff] [blame] | 3873 | mddev->resync_max_sectors = sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3874 | return 0; |
| 3875 | } |
| 3876 | |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3877 | #ifdef CONFIG_MD_RAID5_RESHAPE |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 3878 | static int raid5_check_reshape(mddev_t *mddev) |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3879 | { |
| 3880 | raid5_conf_t *conf = mddev_to_conf(mddev); |
| 3881 | int err; |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3882 | |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 3883 | if (mddev->delta_disks < 0 || |
| 3884 | mddev->new_level != mddev->level) |
| 3885 | return -EINVAL; /* Cannot shrink array or change level yet */ |
| 3886 | if (mddev->delta_disks == 0) |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3887 | return 0; /* nothing to do */ |
| 3888 | |
| 3889 | /* Can only proceed if there are plenty of stripe_heads. |
| 3890 | * We need a minimum of one full stripe,, and for sensible progress |
| 3891 | * it is best to have about 4 times that. |
| 3892 | * If we require 4 times, then the default 256 4K stripe_heads will |
| 3893 | * allow for chunk sizes up to 256K, which is probably OK. |
| 3894 | * If the chunk size is greater, user-space should request more |
| 3895 | * stripe_heads first. |
| 3896 | */ |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 3897 | if ((mddev->chunk_size / STRIPE_SIZE) * 4 > conf->max_nr_stripes || |
| 3898 | (mddev->new_chunk / STRIPE_SIZE) * 4 > conf->max_nr_stripes) { |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3899 | printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n", |
| 3900 | (mddev->chunk_size / STRIPE_SIZE)*4); |
| 3901 | return -ENOSPC; |
| 3902 | } |
| 3903 | |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 3904 | err = resize_stripes(conf, conf->raid_disks + mddev->delta_disks); |
| 3905 | if (err) |
| 3906 | return err; |
| 3907 | |
NeilBrown | b4c4c7b | 2007-02-28 20:11:48 -0800 | [diff] [blame] | 3908 | if (mddev->degraded > conf->max_degraded) |
| 3909 | return -EINVAL; |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 3910 | /* looks like we might be able to manage this */ |
| 3911 | return 0; |
| 3912 | } |
| 3913 | |
| 3914 | static int raid5_start_reshape(mddev_t *mddev) |
| 3915 | { |
| 3916 | raid5_conf_t *conf = mddev_to_conf(mddev); |
| 3917 | mdk_rdev_t *rdev; |
| 3918 | struct list_head *rtmp; |
| 3919 | int spares = 0; |
| 3920 | int added_devices = 0; |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 3921 | unsigned long flags; |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 3922 | |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3923 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 3924 | return -EBUSY; |
| 3925 | |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3926 | ITERATE_RDEV(mddev, rdev, rtmp) |
| 3927 | if (rdev->raid_disk < 0 && |
| 3928 | !test_bit(Faulty, &rdev->flags)) |
| 3929 | spares++; |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 3930 | |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3931 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3932 | /* Not enough devices even to make a degraded array |
| 3933 | * of that size |
| 3934 | */ |
| 3935 | return -EINVAL; |
| 3936 | |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3937 | atomic_set(&conf->reshape_stripes, 0); |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3938 | spin_lock_irq(&conf->device_lock); |
| 3939 | conf->previous_raid_disks = conf->raid_disks; |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 3940 | conf->raid_disks += mddev->delta_disks; |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3941 | conf->expand_progress = 0; |
NeilBrown | b578d55 | 2006-03-27 01:18:12 -0800 | [diff] [blame] | 3942 | conf->expand_lo = 0; |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3943 | spin_unlock_irq(&conf->device_lock); |
| 3944 | |
| 3945 | /* Add some new drives, as many as will fit. |
| 3946 | * We know there are enough to make the newly sized array work. |
| 3947 | */ |
| 3948 | ITERATE_RDEV(mddev, rdev, rtmp) |
| 3949 | if (rdev->raid_disk < 0 && |
| 3950 | !test_bit(Faulty, &rdev->flags)) { |
| 3951 | if (raid5_add_disk(mddev, rdev)) { |
| 3952 | char nm[20]; |
| 3953 | set_bit(In_sync, &rdev->flags); |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3954 | added_devices++; |
NeilBrown | 5fd6c1d | 2006-06-26 00:27:40 -0700 | [diff] [blame] | 3955 | rdev->recovery_offset = 0; |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3956 | sprintf(nm, "rd%d", rdev->raid_disk); |
NeilBrown | 5e55e2f | 2007-03-26 21:32:14 -0800 | [diff] [blame^] | 3957 | if (sysfs_create_link(&mddev->kobj, |
| 3958 | &rdev->kobj, nm)) |
| 3959 | printk(KERN_WARNING |
| 3960 | "raid5: failed to create " |
| 3961 | " link %s for %s\n", |
| 3962 | nm, mdname(mddev)); |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3963 | } else |
| 3964 | break; |
| 3965 | } |
| 3966 | |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 3967 | spin_lock_irqsave(&conf->device_lock, flags); |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 3968 | mddev->degraded = (conf->raid_disks - conf->previous_raid_disks) - added_devices; |
NeilBrown | c04be0a | 2006-10-03 01:15:53 -0700 | [diff] [blame] | 3969 | spin_unlock_irqrestore(&conf->device_lock, flags); |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 3970 | mddev->raid_disks = conf->raid_disks; |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3971 | mddev->reshape_position = 0; |
NeilBrown | 850b2b4 | 2006-10-03 01:15:46 -0700 | [diff] [blame] | 3972 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3973 | |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 3974 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
| 3975 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
| 3976 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
| 3977 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
| 3978 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, |
| 3979 | "%s_reshape"); |
| 3980 | if (!mddev->sync_thread) { |
| 3981 | mddev->recovery = 0; |
| 3982 | spin_lock_irq(&conf->device_lock); |
| 3983 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; |
| 3984 | conf->expand_progress = MaxSector; |
| 3985 | spin_unlock_irq(&conf->device_lock); |
| 3986 | return -EAGAIN; |
| 3987 | } |
| 3988 | md_wakeup_thread(mddev->sync_thread); |
| 3989 | md_new_event(mddev); |
| 3990 | return 0; |
| 3991 | } |
| 3992 | #endif |
| 3993 | |
| 3994 | static void end_reshape(raid5_conf_t *conf) |
| 3995 | { |
| 3996 | struct block_device *bdev; |
| 3997 | |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 3998 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 3999 | conf->mddev->array_size = conf->mddev->size * |
| 4000 | (conf->raid_disks - conf->max_degraded); |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 4001 | set_capacity(conf->mddev->gendisk, conf->mddev->array_size << 1); |
| 4002 | conf->mddev->changed = 1; |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 4003 | |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 4004 | bdev = bdget_disk(conf->mddev->gendisk, 0); |
| 4005 | if (bdev) { |
| 4006 | mutex_lock(&bdev->bd_inode->i_mutex); |
NeilBrown | 0692c6b | 2006-11-08 17:44:48 -0800 | [diff] [blame] | 4007 | i_size_write(bdev->bd_inode, (loff_t)conf->mddev->array_size << 10); |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 4008 | mutex_unlock(&bdev->bd_inode->i_mutex); |
| 4009 | bdput(bdev); |
| 4010 | } |
| 4011 | spin_lock_irq(&conf->device_lock); |
| 4012 | conf->expand_progress = MaxSector; |
| 4013 | spin_unlock_irq(&conf->device_lock); |
| 4014 | conf->mddev->reshape_position = MaxSector; |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 4015 | |
| 4016 | /* read-ahead size must cover two whole stripes, which is |
| 4017 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices |
| 4018 | */ |
| 4019 | { |
| 4020 | int data_disks = conf->previous_raid_disks - conf->max_degraded; |
| 4021 | int stripe = data_disks * |
| 4022 | (conf->mddev->chunk_size / PAGE_SIZE); |
| 4023 | if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
| 4024 | conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; |
| 4025 | } |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 4026 | } |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 4027 | } |
| 4028 | |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 4029 | static void raid5_quiesce(mddev_t *mddev, int state) |
| 4030 | { |
| 4031 | raid5_conf_t *conf = mddev_to_conf(mddev); |
| 4032 | |
| 4033 | switch(state) { |
NeilBrown | e464eaf | 2006-03-27 01:18:14 -0800 | [diff] [blame] | 4034 | case 2: /* resume for a suspend */ |
| 4035 | wake_up(&conf->wait_for_overlap); |
| 4036 | break; |
| 4037 | |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 4038 | case 1: /* stop all writes */ |
| 4039 | spin_lock_irq(&conf->device_lock); |
| 4040 | conf->quiesce = 1; |
| 4041 | wait_event_lock_irq(conf->wait_for_stripe, |
Raz Ben-Jehuda(caro) | 46031f9 | 2006-12-10 02:20:47 -0800 | [diff] [blame] | 4042 | atomic_read(&conf->active_stripes) == 0 && |
| 4043 | atomic_read(&conf->active_aligned_reads) == 0, |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 4044 | conf->device_lock, /* nothing */); |
| 4045 | spin_unlock_irq(&conf->device_lock); |
| 4046 | break; |
| 4047 | |
| 4048 | case 0: /* re-enable writes */ |
| 4049 | spin_lock_irq(&conf->device_lock); |
| 4050 | conf->quiesce = 0; |
| 4051 | wake_up(&conf->wait_for_stripe); |
NeilBrown | e464eaf | 2006-03-27 01:18:14 -0800 | [diff] [blame] | 4052 | wake_up(&conf->wait_for_overlap); |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 4053 | spin_unlock_irq(&conf->device_lock); |
| 4054 | break; |
| 4055 | } |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 4056 | } |
NeilBrown | b15c2e5 | 2006-01-06 00:20:16 -0800 | [diff] [blame] | 4057 | |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 4058 | static struct mdk_personality raid6_personality = |
| 4059 | { |
| 4060 | .name = "raid6", |
| 4061 | .level = 6, |
| 4062 | .owner = THIS_MODULE, |
| 4063 | .make_request = make_request, |
| 4064 | .run = run, |
| 4065 | .stop = stop, |
| 4066 | .status = status, |
| 4067 | .error_handler = error, |
| 4068 | .hot_add_disk = raid5_add_disk, |
| 4069 | .hot_remove_disk= raid5_remove_disk, |
| 4070 | .spare_active = raid5_spare_active, |
| 4071 | .sync_request = sync_request, |
| 4072 | .resize = raid5_resize, |
NeilBrown | f416885 | 2007-02-28 20:11:53 -0800 | [diff] [blame] | 4073 | #ifdef CONFIG_MD_RAID5_RESHAPE |
| 4074 | .check_reshape = raid5_check_reshape, |
| 4075 | .start_reshape = raid5_start_reshape, |
| 4076 | #endif |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 4077 | .quiesce = raid5_quiesce, |
| 4078 | }; |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 4079 | static struct mdk_personality raid5_personality = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4080 | { |
| 4081 | .name = "raid5", |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 4082 | .level = 5, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4083 | .owner = THIS_MODULE, |
| 4084 | .make_request = make_request, |
| 4085 | .run = run, |
| 4086 | .stop = stop, |
| 4087 | .status = status, |
| 4088 | .error_handler = error, |
| 4089 | .hot_add_disk = raid5_add_disk, |
| 4090 | .hot_remove_disk= raid5_remove_disk, |
| 4091 | .spare_active = raid5_spare_active, |
| 4092 | .sync_request = sync_request, |
| 4093 | .resize = raid5_resize, |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 4094 | #ifdef CONFIG_MD_RAID5_RESHAPE |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 4095 | .check_reshape = raid5_check_reshape, |
| 4096 | .start_reshape = raid5_start_reshape, |
NeilBrown | 2926955 | 2006-03-27 01:18:10 -0800 | [diff] [blame] | 4097 | #endif |
NeilBrown | 7262668 | 2005-09-09 16:23:54 -0700 | [diff] [blame] | 4098 | .quiesce = raid5_quiesce, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4099 | }; |
| 4100 | |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 4101 | static struct mdk_personality raid4_personality = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4102 | { |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 4103 | .name = "raid4", |
| 4104 | .level = 4, |
| 4105 | .owner = THIS_MODULE, |
| 4106 | .make_request = make_request, |
| 4107 | .run = run, |
| 4108 | .stop = stop, |
| 4109 | .status = status, |
| 4110 | .error_handler = error, |
| 4111 | .hot_add_disk = raid5_add_disk, |
| 4112 | .hot_remove_disk= raid5_remove_disk, |
| 4113 | .spare_active = raid5_spare_active, |
| 4114 | .sync_request = sync_request, |
| 4115 | .resize = raid5_resize, |
NeilBrown | 3d37890 | 2007-03-26 21:32:13 -0800 | [diff] [blame] | 4116 | #ifdef CONFIG_MD_RAID5_RESHAPE |
| 4117 | .check_reshape = raid5_check_reshape, |
| 4118 | .start_reshape = raid5_start_reshape, |
| 4119 | #endif |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 4120 | .quiesce = raid5_quiesce, |
| 4121 | }; |
| 4122 | |
| 4123 | static int __init raid5_init(void) |
| 4124 | { |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 4125 | int e; |
| 4126 | |
| 4127 | e = raid6_select_algo(); |
| 4128 | if ( e ) |
| 4129 | return e; |
| 4130 | register_md_personality(&raid6_personality); |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 4131 | register_md_personality(&raid5_personality); |
| 4132 | register_md_personality(&raid4_personality); |
| 4133 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4134 | } |
| 4135 | |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 4136 | static void raid5_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4137 | { |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 4138 | unregister_md_personality(&raid6_personality); |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 4139 | unregister_md_personality(&raid5_personality); |
| 4140 | unregister_md_personality(&raid4_personality); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4141 | } |
| 4142 | |
| 4143 | module_init(raid5_init); |
| 4144 | module_exit(raid5_exit); |
| 4145 | MODULE_LICENSE("GPL"); |
| 4146 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ |
NeilBrown | d9d166c | 2006-01-06 00:20:51 -0800 | [diff] [blame] | 4147 | MODULE_ALIAS("md-raid5"); |
| 4148 | MODULE_ALIAS("md-raid4"); |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 4149 | MODULE_ALIAS("md-level-5"); |
| 4150 | MODULE_ALIAS("md-level-4"); |
NeilBrown | 16a53ec | 2006-06-26 00:27:38 -0700 | [diff] [blame] | 4151 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
| 4152 | MODULE_ALIAS("md-raid6"); |
| 4153 | MODULE_ALIAS("md-level-6"); |
| 4154 | |
| 4155 | /* This used to be two separate modules, they were: */ |
| 4156 | MODULE_ALIAS("raid5"); |
| 4157 | MODULE_ALIAS("raid6"); |