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Commit | Line | Data |
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1da177e4 LT |
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 | |
16a53ecc | 5 | * Copyright (C) 2002, 2003 H. Peter Anvin |
1da177e4 | 6 | * |
16a53ecc N |
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! | |
1da177e4 LT |
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 | ||
ae3c20cc N |
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 | */ | |
1da177e4 | 45 | |
1da177e4 LT |
46 | #include <linux/module.h> |
47 | #include <linux/slab.h> | |
1da177e4 LT |
48 | #include <linux/highmem.h> |
49 | #include <linux/bitops.h> | |
f6705578 | 50 | #include <linux/kthread.h> |
1da177e4 | 51 | #include <asm/atomic.h> |
16a53ecc | 52 | #include "raid6.h" |
1da177e4 | 53 | |
72626685 | 54 | #include <linux/raid/bitmap.h> |
91c00924 | 55 | #include <linux/async_tx.h> |
72626685 | 56 | |
1da177e4 LT |
57 | /* |
58 | * Stripe cache | |
59 | */ | |
60 | ||
61 | #define NR_STRIPES 256 | |
62 | #define STRIPE_SIZE PAGE_SIZE | |
63 | #define STRIPE_SHIFT (PAGE_SHIFT - 9) | |
64 | #define STRIPE_SECTORS (STRIPE_SIZE>>9) | |
65 | #define IO_THRESHOLD 1 | |
fccddba0 | 66 | #define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head)) |
1da177e4 LT |
67 | #define HASH_MASK (NR_HASH - 1) |
68 | ||
fccddba0 | 69 | #define stripe_hash(conf, sect) (&((conf)->stripe_hashtbl[((sect) >> STRIPE_SHIFT) & HASH_MASK])) |
1da177e4 LT |
70 | |
71 | /* bio's attached to a stripe+device for I/O are linked together in bi_sector | |
72 | * order without overlap. There may be several bio's per stripe+device, and | |
73 | * a bio could span several devices. | |
74 | * When walking this list for a particular stripe+device, we must never proceed | |
75 | * beyond a bio that extends past this device, as the next bio might no longer | |
76 | * be valid. | |
77 | * This macro is used to determine the 'next' bio in the list, given the sector | |
78 | * of the current stripe+device | |
79 | */ | |
80 | #define r5_next_bio(bio, sect) ( ( (bio)->bi_sector + ((bio)->bi_size>>9) < sect + STRIPE_SECTORS) ? (bio)->bi_next : NULL) | |
81 | /* | |
82 | * The following can be used to debug the driver | |
83 | */ | |
1da177e4 LT |
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 | ||
45b4233c | 91 | #ifdef DEBUG |
1da177e4 LT |
92 | #define inline |
93 | #define __inline__ | |
94 | #endif | |
95 | ||
16a53ecc N |
96 | #if !RAID6_USE_EMPTY_ZERO_PAGE |
97 | /* In .bss so it's zeroed */ | |
98 | const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256))); | |
99 | #endif | |
100 | ||
101 | static inline int raid6_next_disk(int disk, int raid_disks) | |
102 | { | |
103 | disk++; | |
104 | return (disk < raid_disks) ? disk : 0; | |
105 | } | |
a4456856 DW |
106 | |
107 | static void return_io(struct bio *return_bi) | |
108 | { | |
109 | struct bio *bi = return_bi; | |
110 | while (bi) { | |
a4456856 DW |
111 | |
112 | return_bi = bi->bi_next; | |
113 | bi->bi_next = NULL; | |
114 | bi->bi_size = 0; | |
6712ecf8 | 115 | bi->bi_end_io(bi, |
a4456856 DW |
116 | test_bit(BIO_UPTODATE, &bi->bi_flags) |
117 | ? 0 : -EIO); | |
118 | bi = return_bi; | |
119 | } | |
120 | } | |
121 | ||
1da177e4 LT |
122 | static void print_raid5_conf (raid5_conf_t *conf); |
123 | ||
858119e1 | 124 | static void __release_stripe(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 LT |
125 | { |
126 | if (atomic_dec_and_test(&sh->count)) { | |
78bafebd ES |
127 | BUG_ON(!list_empty(&sh->lru)); |
128 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1da177e4 | 129 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
7c785b7a | 130 | if (test_bit(STRIPE_DELAYED, &sh->state)) { |
1da177e4 | 131 | list_add_tail(&sh->lru, &conf->delayed_list); |
7c785b7a N |
132 | blk_plug_device(conf->mddev->queue); |
133 | } else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && | |
ae3c20cc | 134 | sh->bm_seq - conf->seq_write > 0) { |
72626685 | 135 | list_add_tail(&sh->lru, &conf->bitmap_list); |
7c785b7a N |
136 | blk_plug_device(conf->mddev->queue); |
137 | } else { | |
72626685 | 138 | clear_bit(STRIPE_BIT_DELAY, &sh->state); |
1da177e4 | 139 | list_add_tail(&sh->lru, &conf->handle_list); |
72626685 | 140 | } |
1da177e4 LT |
141 | md_wakeup_thread(conf->mddev->thread); |
142 | } else { | |
d84e0f10 | 143 | BUG_ON(sh->ops.pending); |
1da177e4 LT |
144 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { |
145 | atomic_dec(&conf->preread_active_stripes); | |
146 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) | |
147 | md_wakeup_thread(conf->mddev->thread); | |
148 | } | |
1da177e4 | 149 | atomic_dec(&conf->active_stripes); |
ccfcc3c1 N |
150 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
151 | list_add_tail(&sh->lru, &conf->inactive_list); | |
1da177e4 | 152 | wake_up(&conf->wait_for_stripe); |
46031f9a RBJ |
153 | if (conf->retry_read_aligned) |
154 | md_wakeup_thread(conf->mddev->thread); | |
ccfcc3c1 | 155 | } |
1da177e4 LT |
156 | } |
157 | } | |
158 | } | |
159 | static void release_stripe(struct stripe_head *sh) | |
160 | { | |
161 | raid5_conf_t *conf = sh->raid_conf; | |
162 | unsigned long flags; | |
16a53ecc | 163 | |
1da177e4 LT |
164 | spin_lock_irqsave(&conf->device_lock, flags); |
165 | __release_stripe(conf, sh); | |
166 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
167 | } | |
168 | ||
fccddba0 | 169 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 170 | { |
45b4233c DW |
171 | pr_debug("remove_hash(), stripe %llu\n", |
172 | (unsigned long long)sh->sector); | |
1da177e4 | 173 | |
fccddba0 | 174 | hlist_del_init(&sh->hash); |
1da177e4 LT |
175 | } |
176 | ||
16a53ecc | 177 | static inline void insert_hash(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 | 178 | { |
fccddba0 | 179 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 180 | |
45b4233c DW |
181 | pr_debug("insert_hash(), stripe %llu\n", |
182 | (unsigned long long)sh->sector); | |
1da177e4 LT |
183 | |
184 | CHECK_DEVLOCK(); | |
fccddba0 | 185 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
186 | } |
187 | ||
188 | ||
189 | /* find an idle stripe, make sure it is unhashed, and return it. */ | |
190 | static struct stripe_head *get_free_stripe(raid5_conf_t *conf) | |
191 | { | |
192 | struct stripe_head *sh = NULL; | |
193 | struct list_head *first; | |
194 | ||
195 | CHECK_DEVLOCK(); | |
196 | if (list_empty(&conf->inactive_list)) | |
197 | goto out; | |
198 | first = conf->inactive_list.next; | |
199 | sh = list_entry(first, struct stripe_head, lru); | |
200 | list_del_init(first); | |
201 | remove_hash(sh); | |
202 | atomic_inc(&conf->active_stripes); | |
203 | out: | |
204 | return sh; | |
205 | } | |
206 | ||
207 | static void shrink_buffers(struct stripe_head *sh, int num) | |
208 | { | |
209 | struct page *p; | |
210 | int i; | |
211 | ||
212 | for (i=0; i<num ; i++) { | |
213 | p = sh->dev[i].page; | |
214 | if (!p) | |
215 | continue; | |
216 | sh->dev[i].page = NULL; | |
2d1f3b5d | 217 | put_page(p); |
1da177e4 LT |
218 | } |
219 | } | |
220 | ||
221 | static int grow_buffers(struct stripe_head *sh, int num) | |
222 | { | |
223 | int i; | |
224 | ||
225 | for (i=0; i<num; i++) { | |
226 | struct page *page; | |
227 | ||
228 | if (!(page = alloc_page(GFP_KERNEL))) { | |
229 | return 1; | |
230 | } | |
231 | sh->dev[i].page = page; | |
232 | } | |
233 | return 0; | |
234 | } | |
235 | ||
236 | static void raid5_build_block (struct stripe_head *sh, int i); | |
237 | ||
7ecaa1e6 | 238 | static void init_stripe(struct stripe_head *sh, sector_t sector, int pd_idx, int disks) |
1da177e4 LT |
239 | { |
240 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 241 | int i; |
1da177e4 | 242 | |
78bafebd ES |
243 | BUG_ON(atomic_read(&sh->count) != 0); |
244 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
d84e0f10 DW |
245 | BUG_ON(sh->ops.pending || sh->ops.ack || sh->ops.complete); |
246 | ||
1da177e4 | 247 | CHECK_DEVLOCK(); |
45b4233c | 248 | pr_debug("init_stripe called, stripe %llu\n", |
1da177e4 LT |
249 | (unsigned long long)sh->sector); |
250 | ||
251 | remove_hash(sh); | |
16a53ecc | 252 | |
1da177e4 LT |
253 | sh->sector = sector; |
254 | sh->pd_idx = pd_idx; | |
255 | sh->state = 0; | |
256 | ||
7ecaa1e6 N |
257 | sh->disks = disks; |
258 | ||
259 | for (i = sh->disks; i--; ) { | |
1da177e4 LT |
260 | struct r5dev *dev = &sh->dev[i]; |
261 | ||
d84e0f10 | 262 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 263 | test_bit(R5_LOCKED, &dev->flags)) { |
d84e0f10 | 264 | printk(KERN_ERR "sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 265 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 266 | dev->read, dev->towrite, dev->written, |
1da177e4 LT |
267 | test_bit(R5_LOCKED, &dev->flags)); |
268 | BUG(); | |
269 | } | |
270 | dev->flags = 0; | |
271 | raid5_build_block(sh, i); | |
272 | } | |
273 | insert_hash(conf, sh); | |
274 | } | |
275 | ||
7ecaa1e6 | 276 | static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, int disks) |
1da177e4 LT |
277 | { |
278 | struct stripe_head *sh; | |
fccddba0 | 279 | struct hlist_node *hn; |
1da177e4 LT |
280 | |
281 | CHECK_DEVLOCK(); | |
45b4233c | 282 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
fccddba0 | 283 | hlist_for_each_entry(sh, hn, stripe_hash(conf, sector), hash) |
7ecaa1e6 | 284 | if (sh->sector == sector && sh->disks == disks) |
1da177e4 | 285 | return sh; |
45b4233c | 286 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
287 | return NULL; |
288 | } | |
289 | ||
290 | static void unplug_slaves(mddev_t *mddev); | |
165125e1 | 291 | static void raid5_unplug_device(struct request_queue *q); |
1da177e4 | 292 | |
7ecaa1e6 N |
293 | static struct stripe_head *get_active_stripe(raid5_conf_t *conf, sector_t sector, int disks, |
294 | int pd_idx, int noblock) | |
1da177e4 LT |
295 | { |
296 | struct stripe_head *sh; | |
297 | ||
45b4233c | 298 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 LT |
299 | |
300 | spin_lock_irq(&conf->device_lock); | |
301 | ||
302 | do { | |
72626685 N |
303 | wait_event_lock_irq(conf->wait_for_stripe, |
304 | conf->quiesce == 0, | |
305 | conf->device_lock, /* nothing */); | |
7ecaa1e6 | 306 | sh = __find_stripe(conf, sector, disks); |
1da177e4 LT |
307 | if (!sh) { |
308 | if (!conf->inactive_blocked) | |
309 | sh = get_free_stripe(conf); | |
310 | if (noblock && sh == NULL) | |
311 | break; | |
312 | if (!sh) { | |
313 | conf->inactive_blocked = 1; | |
314 | wait_event_lock_irq(conf->wait_for_stripe, | |
315 | !list_empty(&conf->inactive_list) && | |
5036805b N |
316 | (atomic_read(&conf->active_stripes) |
317 | < (conf->max_nr_stripes *3/4) | |
1da177e4 LT |
318 | || !conf->inactive_blocked), |
319 | conf->device_lock, | |
f4370781 | 320 | raid5_unplug_device(conf->mddev->queue) |
1da177e4 LT |
321 | ); |
322 | conf->inactive_blocked = 0; | |
323 | } else | |
7ecaa1e6 | 324 | init_stripe(sh, sector, pd_idx, disks); |
1da177e4 LT |
325 | } else { |
326 | if (atomic_read(&sh->count)) { | |
78bafebd | 327 | BUG_ON(!list_empty(&sh->lru)); |
1da177e4 LT |
328 | } else { |
329 | if (!test_bit(STRIPE_HANDLE, &sh->state)) | |
330 | atomic_inc(&conf->active_stripes); | |
ff4e8d9a N |
331 | if (list_empty(&sh->lru) && |
332 | !test_bit(STRIPE_EXPANDING, &sh->state)) | |
16a53ecc N |
333 | BUG(); |
334 | list_del_init(&sh->lru); | |
1da177e4 LT |
335 | } |
336 | } | |
337 | } while (sh == NULL); | |
338 | ||
339 | if (sh) | |
340 | atomic_inc(&sh->count); | |
341 | ||
342 | spin_unlock_irq(&conf->device_lock); | |
343 | return sh; | |
344 | } | |
345 | ||
d84e0f10 DW |
346 | /* test_and_ack_op() ensures that we only dequeue an operation once */ |
347 | #define test_and_ack_op(op, pend) \ | |
348 | do { \ | |
349 | if (test_bit(op, &sh->ops.pending) && \ | |
350 | !test_bit(op, &sh->ops.complete)) { \ | |
351 | if (test_and_set_bit(op, &sh->ops.ack)) \ | |
352 | clear_bit(op, &pend); \ | |
353 | else \ | |
354 | ack++; \ | |
355 | } else \ | |
356 | clear_bit(op, &pend); \ | |
357 | } while (0) | |
358 | ||
359 | /* find new work to run, do not resubmit work that is already | |
360 | * in flight | |
361 | */ | |
362 | static unsigned long get_stripe_work(struct stripe_head *sh) | |
363 | { | |
364 | unsigned long pending; | |
365 | int ack = 0; | |
366 | ||
367 | pending = sh->ops.pending; | |
368 | ||
369 | test_and_ack_op(STRIPE_OP_BIOFILL, pending); | |
370 | test_and_ack_op(STRIPE_OP_COMPUTE_BLK, pending); | |
371 | test_and_ack_op(STRIPE_OP_PREXOR, pending); | |
372 | test_and_ack_op(STRIPE_OP_BIODRAIN, pending); | |
373 | test_and_ack_op(STRIPE_OP_POSTXOR, pending); | |
374 | test_and_ack_op(STRIPE_OP_CHECK, pending); | |
375 | if (test_and_clear_bit(STRIPE_OP_IO, &sh->ops.pending)) | |
376 | ack++; | |
377 | ||
378 | sh->ops.count -= ack; | |
4ae3f847 DW |
379 | if (unlikely(sh->ops.count < 0)) { |
380 | printk(KERN_ERR "pending: %#lx ops.pending: %#lx ops.ack: %#lx " | |
381 | "ops.complete: %#lx\n", pending, sh->ops.pending, | |
382 | sh->ops.ack, sh->ops.complete); | |
383 | BUG(); | |
384 | } | |
d84e0f10 DW |
385 | |
386 | return pending; | |
387 | } | |
388 | ||
6712ecf8 N |
389 | static void |
390 | raid5_end_read_request(struct bio *bi, int error); | |
391 | static void | |
392 | raid5_end_write_request(struct bio *bi, int error); | |
91c00924 DW |
393 | |
394 | static void ops_run_io(struct stripe_head *sh) | |
395 | { | |
396 | raid5_conf_t *conf = sh->raid_conf; | |
397 | int i, disks = sh->disks; | |
398 | ||
399 | might_sleep(); | |
400 | ||
401 | for (i = disks; i--; ) { | |
402 | int rw; | |
403 | struct bio *bi; | |
404 | mdk_rdev_t *rdev; | |
405 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) | |
406 | rw = WRITE; | |
407 | else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) | |
408 | rw = READ; | |
409 | else | |
410 | continue; | |
411 | ||
412 | bi = &sh->dev[i].req; | |
413 | ||
414 | bi->bi_rw = rw; | |
415 | if (rw == WRITE) | |
416 | bi->bi_end_io = raid5_end_write_request; | |
417 | else | |
418 | bi->bi_end_io = raid5_end_read_request; | |
419 | ||
420 | rcu_read_lock(); | |
421 | rdev = rcu_dereference(conf->disks[i].rdev); | |
422 | if (rdev && test_bit(Faulty, &rdev->flags)) | |
423 | rdev = NULL; | |
424 | if (rdev) | |
425 | atomic_inc(&rdev->nr_pending); | |
426 | rcu_read_unlock(); | |
427 | ||
428 | if (rdev) { | |
429 | if (test_bit(STRIPE_SYNCING, &sh->state) || | |
430 | test_bit(STRIPE_EXPAND_SOURCE, &sh->state) || | |
431 | test_bit(STRIPE_EXPAND_READY, &sh->state)) | |
432 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); | |
433 | ||
434 | bi->bi_bdev = rdev->bdev; | |
435 | pr_debug("%s: for %llu schedule op %ld on disc %d\n", | |
436 | __FUNCTION__, (unsigned long long)sh->sector, | |
437 | bi->bi_rw, i); | |
438 | atomic_inc(&sh->count); | |
439 | bi->bi_sector = sh->sector + rdev->data_offset; | |
440 | bi->bi_flags = 1 << BIO_UPTODATE; | |
441 | bi->bi_vcnt = 1; | |
442 | bi->bi_max_vecs = 1; | |
443 | bi->bi_idx = 0; | |
444 | bi->bi_io_vec = &sh->dev[i].vec; | |
445 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; | |
446 | bi->bi_io_vec[0].bv_offset = 0; | |
447 | bi->bi_size = STRIPE_SIZE; | |
448 | bi->bi_next = NULL; | |
449 | if (rw == WRITE && | |
450 | test_bit(R5_ReWrite, &sh->dev[i].flags)) | |
451 | atomic_add(STRIPE_SECTORS, | |
452 | &rdev->corrected_errors); | |
453 | generic_make_request(bi); | |
454 | } else { | |
455 | if (rw == WRITE) | |
456 | set_bit(STRIPE_DEGRADED, &sh->state); | |
457 | pr_debug("skip op %ld on disc %d for sector %llu\n", | |
458 | bi->bi_rw, i, (unsigned long long)sh->sector); | |
459 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
460 | set_bit(STRIPE_HANDLE, &sh->state); | |
461 | } | |
462 | } | |
463 | } | |
464 | ||
465 | static struct dma_async_tx_descriptor * | |
466 | async_copy_data(int frombio, struct bio *bio, struct page *page, | |
467 | sector_t sector, struct dma_async_tx_descriptor *tx) | |
468 | { | |
469 | struct bio_vec *bvl; | |
470 | struct page *bio_page; | |
471 | int i; | |
472 | int page_offset; | |
473 | ||
474 | if (bio->bi_sector >= sector) | |
475 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
476 | else | |
477 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
478 | bio_for_each_segment(bvl, bio, i) { | |
479 | int len = bio_iovec_idx(bio, i)->bv_len; | |
480 | int clen; | |
481 | int b_offset = 0; | |
482 | ||
483 | if (page_offset < 0) { | |
484 | b_offset = -page_offset; | |
485 | page_offset += b_offset; | |
486 | len -= b_offset; | |
487 | } | |
488 | ||
489 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
490 | clen = STRIPE_SIZE - page_offset; | |
491 | else | |
492 | clen = len; | |
493 | ||
494 | if (clen > 0) { | |
495 | b_offset += bio_iovec_idx(bio, i)->bv_offset; | |
496 | bio_page = bio_iovec_idx(bio, i)->bv_page; | |
497 | if (frombio) | |
498 | tx = async_memcpy(page, bio_page, page_offset, | |
499 | b_offset, clen, | |
eb0645a8 | 500 | ASYNC_TX_DEP_ACK, |
91c00924 DW |
501 | tx, NULL, NULL); |
502 | else | |
503 | tx = async_memcpy(bio_page, page, b_offset, | |
504 | page_offset, clen, | |
eb0645a8 | 505 | ASYNC_TX_DEP_ACK, |
91c00924 DW |
506 | tx, NULL, NULL); |
507 | } | |
508 | if (clen < len) /* hit end of page */ | |
509 | break; | |
510 | page_offset += len; | |
511 | } | |
512 | ||
513 | return tx; | |
514 | } | |
515 | ||
516 | static void ops_complete_biofill(void *stripe_head_ref) | |
517 | { | |
518 | struct stripe_head *sh = stripe_head_ref; | |
519 | struct bio *return_bi = NULL; | |
520 | raid5_conf_t *conf = sh->raid_conf; | |
e4d84909 | 521 | int i; |
91c00924 DW |
522 | |
523 | pr_debug("%s: stripe %llu\n", __FUNCTION__, | |
524 | (unsigned long long)sh->sector); | |
525 | ||
526 | /* clear completed biofills */ | |
527 | for (i = sh->disks; i--; ) { | |
528 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
529 | |
530 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
531 | /* and check if we need to reply to a read request, |
532 | * new R5_Wantfill requests are held off until | |
533 | * !test_bit(STRIPE_OP_BIOFILL, &sh->ops.pending) | |
534 | */ | |
535 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 536 | struct bio *rbi, *rbi2; |
91c00924 DW |
537 | |
538 | /* The access to dev->read is outside of the | |
539 | * spin_lock_irq(&conf->device_lock), but is protected | |
540 | * by the STRIPE_OP_BIOFILL pending bit | |
541 | */ | |
542 | BUG_ON(!dev->read); | |
543 | rbi = dev->read; | |
544 | dev->read = NULL; | |
545 | while (rbi && rbi->bi_sector < | |
546 | dev->sector + STRIPE_SECTORS) { | |
547 | rbi2 = r5_next_bio(rbi, dev->sector); | |
548 | spin_lock_irq(&conf->device_lock); | |
549 | if (--rbi->bi_phys_segments == 0) { | |
550 | rbi->bi_next = return_bi; | |
551 | return_bi = rbi; | |
552 | } | |
553 | spin_unlock_irq(&conf->device_lock); | |
554 | rbi = rbi2; | |
555 | } | |
556 | } | |
557 | } | |
4ae3f847 | 558 | set_bit(STRIPE_OP_BIOFILL, &sh->ops.complete); |
91c00924 DW |
559 | |
560 | return_io(return_bi); | |
561 | ||
e4d84909 | 562 | set_bit(STRIPE_HANDLE, &sh->state); |
91c00924 DW |
563 | release_stripe(sh); |
564 | } | |
565 | ||
566 | static void ops_run_biofill(struct stripe_head *sh) | |
567 | { | |
568 | struct dma_async_tx_descriptor *tx = NULL; | |
569 | raid5_conf_t *conf = sh->raid_conf; | |
570 | int i; | |
571 | ||
572 | pr_debug("%s: stripe %llu\n", __FUNCTION__, | |
573 | (unsigned long long)sh->sector); | |
574 | ||
575 | for (i = sh->disks; i--; ) { | |
576 | struct r5dev *dev = &sh->dev[i]; | |
577 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
578 | struct bio *rbi; | |
579 | spin_lock_irq(&conf->device_lock); | |
580 | dev->read = rbi = dev->toread; | |
581 | dev->toread = NULL; | |
582 | spin_unlock_irq(&conf->device_lock); | |
583 | while (rbi && rbi->bi_sector < | |
584 | dev->sector + STRIPE_SECTORS) { | |
585 | tx = async_copy_data(0, rbi, dev->page, | |
586 | dev->sector, tx); | |
587 | rbi = r5_next_bio(rbi, dev->sector); | |
588 | } | |
589 | } | |
590 | } | |
591 | ||
592 | atomic_inc(&sh->count); | |
593 | async_trigger_callback(ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, tx, | |
594 | ops_complete_biofill, sh); | |
595 | } | |
596 | ||
597 | static void ops_complete_compute5(void *stripe_head_ref) | |
598 | { | |
599 | struct stripe_head *sh = stripe_head_ref; | |
600 | int target = sh->ops.target; | |
601 | struct r5dev *tgt = &sh->dev[target]; | |
602 | ||
603 | pr_debug("%s: stripe %llu\n", __FUNCTION__, | |
604 | (unsigned long long)sh->sector); | |
605 | ||
606 | set_bit(R5_UPTODATE, &tgt->flags); | |
607 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
608 | clear_bit(R5_Wantcompute, &tgt->flags); | |
609 | set_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.complete); | |
610 | set_bit(STRIPE_HANDLE, &sh->state); | |
611 | release_stripe(sh); | |
612 | } | |
613 | ||
614 | static struct dma_async_tx_descriptor * | |
615 | ops_run_compute5(struct stripe_head *sh, unsigned long pending) | |
616 | { | |
617 | /* kernel stack size limits the total number of disks */ | |
618 | int disks = sh->disks; | |
619 | struct page *xor_srcs[disks]; | |
620 | int target = sh->ops.target; | |
621 | struct r5dev *tgt = &sh->dev[target]; | |
622 | struct page *xor_dest = tgt->page; | |
623 | int count = 0; | |
624 | struct dma_async_tx_descriptor *tx; | |
625 | int i; | |
626 | ||
627 | pr_debug("%s: stripe %llu block: %d\n", | |
628 | __FUNCTION__, (unsigned long long)sh->sector, target); | |
629 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
630 | ||
631 | for (i = disks; i--; ) | |
632 | if (i != target) | |
633 | xor_srcs[count++] = sh->dev[i].page; | |
634 | ||
635 | atomic_inc(&sh->count); | |
636 | ||
637 | if (unlikely(count == 1)) | |
638 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, | |
639 | 0, NULL, ops_complete_compute5, sh); | |
640 | else | |
641 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, | |
642 | ASYNC_TX_XOR_ZERO_DST, NULL, | |
643 | ops_complete_compute5, sh); | |
644 | ||
645 | /* ack now if postxor is not set to be run */ | |
646 | if (tx && !test_bit(STRIPE_OP_POSTXOR, &pending)) | |
647 | async_tx_ack(tx); | |
648 | ||
649 | return tx; | |
650 | } | |
651 | ||
652 | static void ops_complete_prexor(void *stripe_head_ref) | |
653 | { | |
654 | struct stripe_head *sh = stripe_head_ref; | |
655 | ||
656 | pr_debug("%s: stripe %llu\n", __FUNCTION__, | |
657 | (unsigned long long)sh->sector); | |
658 | ||
659 | set_bit(STRIPE_OP_PREXOR, &sh->ops.complete); | |
660 | } | |
661 | ||
662 | static struct dma_async_tx_descriptor * | |
663 | ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) | |
664 | { | |
665 | /* kernel stack size limits the total number of disks */ | |
666 | int disks = sh->disks; | |
667 | struct page *xor_srcs[disks]; | |
668 | int count = 0, pd_idx = sh->pd_idx, i; | |
669 | ||
670 | /* existing parity data subtracted */ | |
671 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
672 | ||
673 | pr_debug("%s: stripe %llu\n", __FUNCTION__, | |
674 | (unsigned long long)sh->sector); | |
675 | ||
676 | for (i = disks; i--; ) { | |
677 | struct r5dev *dev = &sh->dev[i]; | |
678 | /* Only process blocks that are known to be uptodate */ | |
679 | if (dev->towrite && test_bit(R5_Wantprexor, &dev->flags)) | |
680 | xor_srcs[count++] = dev->page; | |
681 | } | |
682 | ||
683 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, | |
684 | ASYNC_TX_DEP_ACK | ASYNC_TX_XOR_DROP_DST, tx, | |
685 | ops_complete_prexor, sh); | |
686 | ||
687 | return tx; | |
688 | } | |
689 | ||
690 | static struct dma_async_tx_descriptor * | |
691 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) | |
692 | { | |
693 | int disks = sh->disks; | |
694 | int pd_idx = sh->pd_idx, i; | |
695 | ||
696 | /* check if prexor is active which means only process blocks | |
697 | * that are part of a read-modify-write (Wantprexor) | |
698 | */ | |
699 | int prexor = test_bit(STRIPE_OP_PREXOR, &sh->ops.pending); | |
700 | ||
701 | pr_debug("%s: stripe %llu\n", __FUNCTION__, | |
702 | (unsigned long long)sh->sector); | |
703 | ||
704 | for (i = disks; i--; ) { | |
705 | struct r5dev *dev = &sh->dev[i]; | |
706 | struct bio *chosen; | |
707 | int towrite; | |
708 | ||
709 | towrite = 0; | |
710 | if (prexor) { /* rmw */ | |
711 | if (dev->towrite && | |
712 | test_bit(R5_Wantprexor, &dev->flags)) | |
713 | towrite = 1; | |
714 | } else { /* rcw */ | |
715 | if (i != pd_idx && dev->towrite && | |
716 | test_bit(R5_LOCKED, &dev->flags)) | |
717 | towrite = 1; | |
718 | } | |
719 | ||
720 | if (towrite) { | |
721 | struct bio *wbi; | |
722 | ||
723 | spin_lock(&sh->lock); | |
724 | chosen = dev->towrite; | |
725 | dev->towrite = NULL; | |
726 | BUG_ON(dev->written); | |
727 | wbi = dev->written = chosen; | |
728 | spin_unlock(&sh->lock); | |
729 | ||
730 | while (wbi && wbi->bi_sector < | |
731 | dev->sector + STRIPE_SECTORS) { | |
732 | tx = async_copy_data(1, wbi, dev->page, | |
733 | dev->sector, tx); | |
734 | wbi = r5_next_bio(wbi, dev->sector); | |
735 | } | |
736 | } | |
737 | } | |
738 | ||
739 | return tx; | |
740 | } | |
741 | ||
742 | static void ops_complete_postxor(void *stripe_head_ref) | |
743 | { | |
744 | struct stripe_head *sh = stripe_head_ref; | |
745 | ||
746 | pr_debug("%s: stripe %llu\n", __FUNCTION__, | |
747 | (unsigned long long)sh->sector); | |
748 | ||
749 | set_bit(STRIPE_OP_POSTXOR, &sh->ops.complete); | |
750 | set_bit(STRIPE_HANDLE, &sh->state); | |
751 | release_stripe(sh); | |
752 | } | |
753 | ||
754 | static void ops_complete_write(void *stripe_head_ref) | |
755 | { | |
756 | struct stripe_head *sh = stripe_head_ref; | |
757 | int disks = sh->disks, i, pd_idx = sh->pd_idx; | |
758 | ||
759 | pr_debug("%s: stripe %llu\n", __FUNCTION__, | |
760 | (unsigned long long)sh->sector); | |
761 | ||
762 | for (i = disks; i--; ) { | |
763 | struct r5dev *dev = &sh->dev[i]; | |
764 | if (dev->written || i == pd_idx) | |
765 | set_bit(R5_UPTODATE, &dev->flags); | |
766 | } | |
767 | ||
768 | set_bit(STRIPE_OP_BIODRAIN, &sh->ops.complete); | |
769 | set_bit(STRIPE_OP_POSTXOR, &sh->ops.complete); | |
770 | ||
771 | set_bit(STRIPE_HANDLE, &sh->state); | |
772 | release_stripe(sh); | |
773 | } | |
774 | ||
775 | static void | |
776 | ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) | |
777 | { | |
778 | /* kernel stack size limits the total number of disks */ | |
779 | int disks = sh->disks; | |
780 | struct page *xor_srcs[disks]; | |
781 | ||
782 | int count = 0, pd_idx = sh->pd_idx, i; | |
783 | struct page *xor_dest; | |
784 | int prexor = test_bit(STRIPE_OP_PREXOR, &sh->ops.pending); | |
785 | unsigned long flags; | |
786 | dma_async_tx_callback callback; | |
787 | ||
788 | pr_debug("%s: stripe %llu\n", __FUNCTION__, | |
789 | (unsigned long long)sh->sector); | |
790 | ||
791 | /* check if prexor is active which means only process blocks | |
792 | * that are part of a read-modify-write (written) | |
793 | */ | |
794 | if (prexor) { | |
795 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
796 | for (i = disks; i--; ) { | |
797 | struct r5dev *dev = &sh->dev[i]; | |
798 | if (dev->written) | |
799 | xor_srcs[count++] = dev->page; | |
800 | } | |
801 | } else { | |
802 | xor_dest = sh->dev[pd_idx].page; | |
803 | for (i = disks; i--; ) { | |
804 | struct r5dev *dev = &sh->dev[i]; | |
805 | if (i != pd_idx) | |
806 | xor_srcs[count++] = dev->page; | |
807 | } | |
808 | } | |
809 | ||
810 | /* check whether this postxor is part of a write */ | |
811 | callback = test_bit(STRIPE_OP_BIODRAIN, &sh->ops.pending) ? | |
812 | ops_complete_write : ops_complete_postxor; | |
813 | ||
814 | /* 1/ if we prexor'd then the dest is reused as a source | |
815 | * 2/ if we did not prexor then we are redoing the parity | |
816 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
817 | * for the synchronous xor case | |
818 | */ | |
819 | flags = ASYNC_TX_DEP_ACK | ASYNC_TX_ACK | | |
820 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); | |
821 | ||
822 | atomic_inc(&sh->count); | |
823 | ||
824 | if (unlikely(count == 1)) { | |
825 | flags &= ~(ASYNC_TX_XOR_DROP_DST | ASYNC_TX_XOR_ZERO_DST); | |
826 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, | |
827 | flags, tx, callback, sh); | |
828 | } else | |
829 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, | |
830 | flags, tx, callback, sh); | |
831 | } | |
832 | ||
833 | static void ops_complete_check(void *stripe_head_ref) | |
834 | { | |
835 | struct stripe_head *sh = stripe_head_ref; | |
836 | int pd_idx = sh->pd_idx; | |
837 | ||
838 | pr_debug("%s: stripe %llu\n", __FUNCTION__, | |
839 | (unsigned long long)sh->sector); | |
840 | ||
841 | if (test_and_clear_bit(STRIPE_OP_MOD_DMA_CHECK, &sh->ops.pending) && | |
842 | sh->ops.zero_sum_result == 0) | |
843 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
844 | ||
845 | set_bit(STRIPE_OP_CHECK, &sh->ops.complete); | |
846 | set_bit(STRIPE_HANDLE, &sh->state); | |
847 | release_stripe(sh); | |
848 | } | |
849 | ||
850 | static void ops_run_check(struct stripe_head *sh) | |
851 | { | |
852 | /* kernel stack size limits the total number of disks */ | |
853 | int disks = sh->disks; | |
854 | struct page *xor_srcs[disks]; | |
855 | struct dma_async_tx_descriptor *tx; | |
856 | ||
857 | int count = 0, pd_idx = sh->pd_idx, i; | |
858 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
859 | ||
860 | pr_debug("%s: stripe %llu\n", __FUNCTION__, | |
861 | (unsigned long long)sh->sector); | |
862 | ||
863 | for (i = disks; i--; ) { | |
864 | struct r5dev *dev = &sh->dev[i]; | |
865 | if (i != pd_idx) | |
866 | xor_srcs[count++] = dev->page; | |
867 | } | |
868 | ||
869 | tx = async_xor_zero_sum(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, | |
870 | &sh->ops.zero_sum_result, 0, NULL, NULL, NULL); | |
871 | ||
872 | if (tx) | |
873 | set_bit(STRIPE_OP_MOD_DMA_CHECK, &sh->ops.pending); | |
874 | else | |
875 | clear_bit(STRIPE_OP_MOD_DMA_CHECK, &sh->ops.pending); | |
876 | ||
877 | atomic_inc(&sh->count); | |
878 | tx = async_trigger_callback(ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, tx, | |
879 | ops_complete_check, sh); | |
880 | } | |
881 | ||
882 | static void raid5_run_ops(struct stripe_head *sh, unsigned long pending) | |
883 | { | |
884 | int overlap_clear = 0, i, disks = sh->disks; | |
885 | struct dma_async_tx_descriptor *tx = NULL; | |
886 | ||
887 | if (test_bit(STRIPE_OP_BIOFILL, &pending)) { | |
888 | ops_run_biofill(sh); | |
889 | overlap_clear++; | |
890 | } | |
891 | ||
892 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &pending)) | |
893 | tx = ops_run_compute5(sh, pending); | |
894 | ||
895 | if (test_bit(STRIPE_OP_PREXOR, &pending)) | |
896 | tx = ops_run_prexor(sh, tx); | |
897 | ||
898 | if (test_bit(STRIPE_OP_BIODRAIN, &pending)) { | |
899 | tx = ops_run_biodrain(sh, tx); | |
900 | overlap_clear++; | |
901 | } | |
902 | ||
903 | if (test_bit(STRIPE_OP_POSTXOR, &pending)) | |
904 | ops_run_postxor(sh, tx); | |
905 | ||
906 | if (test_bit(STRIPE_OP_CHECK, &pending)) | |
907 | ops_run_check(sh); | |
908 | ||
909 | if (test_bit(STRIPE_OP_IO, &pending)) | |
910 | ops_run_io(sh); | |
911 | ||
912 | if (overlap_clear) | |
913 | for (i = disks; i--; ) { | |
914 | struct r5dev *dev = &sh->dev[i]; | |
915 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
916 | wake_up(&sh->raid_conf->wait_for_overlap); | |
917 | } | |
918 | } | |
919 | ||
3f294f4f | 920 | static int grow_one_stripe(raid5_conf_t *conf) |
1da177e4 LT |
921 | { |
922 | struct stripe_head *sh; | |
3f294f4f N |
923 | sh = kmem_cache_alloc(conf->slab_cache, GFP_KERNEL); |
924 | if (!sh) | |
925 | return 0; | |
926 | memset(sh, 0, sizeof(*sh) + (conf->raid_disks-1)*sizeof(struct r5dev)); | |
927 | sh->raid_conf = conf; | |
928 | spin_lock_init(&sh->lock); | |
929 | ||
930 | if (grow_buffers(sh, conf->raid_disks)) { | |
931 | shrink_buffers(sh, conf->raid_disks); | |
932 | kmem_cache_free(conf->slab_cache, sh); | |
933 | return 0; | |
934 | } | |
7ecaa1e6 | 935 | sh->disks = conf->raid_disks; |
3f294f4f N |
936 | /* we just created an active stripe so... */ |
937 | atomic_set(&sh->count, 1); | |
938 | atomic_inc(&conf->active_stripes); | |
939 | INIT_LIST_HEAD(&sh->lru); | |
940 | release_stripe(sh); | |
941 | return 1; | |
942 | } | |
943 | ||
944 | static int grow_stripes(raid5_conf_t *conf, int num) | |
945 | { | |
e18b890b | 946 | struct kmem_cache *sc; |
1da177e4 LT |
947 | int devs = conf->raid_disks; |
948 | ||
42b9bebe N |
949 | sprintf(conf->cache_name[0], "raid5-%s", mdname(conf->mddev)); |
950 | sprintf(conf->cache_name[1], "raid5-%s-alt", mdname(conf->mddev)); | |
ad01c9e3 N |
951 | conf->active_name = 0; |
952 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 953 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 954 | 0, 0, NULL); |
1da177e4 LT |
955 | if (!sc) |
956 | return 1; | |
957 | conf->slab_cache = sc; | |
ad01c9e3 | 958 | conf->pool_size = devs; |
16a53ecc | 959 | while (num--) |
3f294f4f | 960 | if (!grow_one_stripe(conf)) |
1da177e4 | 961 | return 1; |
1da177e4 LT |
962 | return 0; |
963 | } | |
29269553 N |
964 | |
965 | #ifdef CONFIG_MD_RAID5_RESHAPE | |
ad01c9e3 N |
966 | static int resize_stripes(raid5_conf_t *conf, int newsize) |
967 | { | |
968 | /* Make all the stripes able to hold 'newsize' devices. | |
969 | * New slots in each stripe get 'page' set to a new page. | |
970 | * | |
971 | * This happens in stages: | |
972 | * 1/ create a new kmem_cache and allocate the required number of | |
973 | * stripe_heads. | |
974 | * 2/ gather all the old stripe_heads and tranfer the pages across | |
975 | * to the new stripe_heads. This will have the side effect of | |
976 | * freezing the array as once all stripe_heads have been collected, | |
977 | * no IO will be possible. Old stripe heads are freed once their | |
978 | * pages have been transferred over, and the old kmem_cache is | |
979 | * freed when all stripes are done. | |
980 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
981 | * we simple return a failre status - no need to clean anything up. | |
982 | * 4/ allocate new pages for the new slots in the new stripe_heads. | |
983 | * If this fails, we don't bother trying the shrink the | |
984 | * stripe_heads down again, we just leave them as they are. | |
985 | * As each stripe_head is processed the new one is released into | |
986 | * active service. | |
987 | * | |
988 | * Once step2 is started, we cannot afford to wait for a write, | |
989 | * so we use GFP_NOIO allocations. | |
990 | */ | |
991 | struct stripe_head *osh, *nsh; | |
992 | LIST_HEAD(newstripes); | |
993 | struct disk_info *ndisks; | |
994 | int err = 0; | |
e18b890b | 995 | struct kmem_cache *sc; |
ad01c9e3 N |
996 | int i; |
997 | ||
998 | if (newsize <= conf->pool_size) | |
999 | return 0; /* never bother to shrink */ | |
1000 | ||
2a2275d6 N |
1001 | md_allow_write(conf->mddev); |
1002 | ||
ad01c9e3 N |
1003 | /* Step 1 */ |
1004 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
1005 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 1006 | 0, 0, NULL); |
ad01c9e3 N |
1007 | if (!sc) |
1008 | return -ENOMEM; | |
1009 | ||
1010 | for (i = conf->max_nr_stripes; i; i--) { | |
1011 | nsh = kmem_cache_alloc(sc, GFP_KERNEL); | |
1012 | if (!nsh) | |
1013 | break; | |
1014 | ||
1015 | memset(nsh, 0, sizeof(*nsh) + (newsize-1)*sizeof(struct r5dev)); | |
1016 | ||
1017 | nsh->raid_conf = conf; | |
1018 | spin_lock_init(&nsh->lock); | |
1019 | ||
1020 | list_add(&nsh->lru, &newstripes); | |
1021 | } | |
1022 | if (i) { | |
1023 | /* didn't get enough, give up */ | |
1024 | while (!list_empty(&newstripes)) { | |
1025 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1026 | list_del(&nsh->lru); | |
1027 | kmem_cache_free(sc, nsh); | |
1028 | } | |
1029 | kmem_cache_destroy(sc); | |
1030 | return -ENOMEM; | |
1031 | } | |
1032 | /* Step 2 - Must use GFP_NOIO now. | |
1033 | * OK, we have enough stripes, start collecting inactive | |
1034 | * stripes and copying them over | |
1035 | */ | |
1036 | list_for_each_entry(nsh, &newstripes, lru) { | |
1037 | spin_lock_irq(&conf->device_lock); | |
1038 | wait_event_lock_irq(conf->wait_for_stripe, | |
1039 | !list_empty(&conf->inactive_list), | |
1040 | conf->device_lock, | |
b3b46be3 | 1041 | unplug_slaves(conf->mddev) |
ad01c9e3 N |
1042 | ); |
1043 | osh = get_free_stripe(conf); | |
1044 | spin_unlock_irq(&conf->device_lock); | |
1045 | atomic_set(&nsh->count, 1); | |
1046 | for(i=0; i<conf->pool_size; i++) | |
1047 | nsh->dev[i].page = osh->dev[i].page; | |
1048 | for( ; i<newsize; i++) | |
1049 | nsh->dev[i].page = NULL; | |
1050 | kmem_cache_free(conf->slab_cache, osh); | |
1051 | } | |
1052 | kmem_cache_destroy(conf->slab_cache); | |
1053 | ||
1054 | /* Step 3. | |
1055 | * At this point, we are holding all the stripes so the array | |
1056 | * is completely stalled, so now is a good time to resize | |
1057 | * conf->disks. | |
1058 | */ | |
1059 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); | |
1060 | if (ndisks) { | |
1061 | for (i=0; i<conf->raid_disks; i++) | |
1062 | ndisks[i] = conf->disks[i]; | |
1063 | kfree(conf->disks); | |
1064 | conf->disks = ndisks; | |
1065 | } else | |
1066 | err = -ENOMEM; | |
1067 | ||
1068 | /* Step 4, return new stripes to service */ | |
1069 | while(!list_empty(&newstripes)) { | |
1070 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1071 | list_del_init(&nsh->lru); | |
1072 | for (i=conf->raid_disks; i < newsize; i++) | |
1073 | if (nsh->dev[i].page == NULL) { | |
1074 | struct page *p = alloc_page(GFP_NOIO); | |
1075 | nsh->dev[i].page = p; | |
1076 | if (!p) | |
1077 | err = -ENOMEM; | |
1078 | } | |
1079 | release_stripe(nsh); | |
1080 | } | |
1081 | /* critical section pass, GFP_NOIO no longer needed */ | |
1082 | ||
1083 | conf->slab_cache = sc; | |
1084 | conf->active_name = 1-conf->active_name; | |
1085 | conf->pool_size = newsize; | |
1086 | return err; | |
1087 | } | |
29269553 | 1088 | #endif |
1da177e4 | 1089 | |
3f294f4f | 1090 | static int drop_one_stripe(raid5_conf_t *conf) |
1da177e4 LT |
1091 | { |
1092 | struct stripe_head *sh; | |
1093 | ||
3f294f4f N |
1094 | spin_lock_irq(&conf->device_lock); |
1095 | sh = get_free_stripe(conf); | |
1096 | spin_unlock_irq(&conf->device_lock); | |
1097 | if (!sh) | |
1098 | return 0; | |
78bafebd | 1099 | BUG_ON(atomic_read(&sh->count)); |
ad01c9e3 | 1100 | shrink_buffers(sh, conf->pool_size); |
3f294f4f N |
1101 | kmem_cache_free(conf->slab_cache, sh); |
1102 | atomic_dec(&conf->active_stripes); | |
1103 | return 1; | |
1104 | } | |
1105 | ||
1106 | static void shrink_stripes(raid5_conf_t *conf) | |
1107 | { | |
1108 | while (drop_one_stripe(conf)) | |
1109 | ; | |
1110 | ||
29fc7e3e N |
1111 | if (conf->slab_cache) |
1112 | kmem_cache_destroy(conf->slab_cache); | |
1da177e4 LT |
1113 | conf->slab_cache = NULL; |
1114 | } | |
1115 | ||
6712ecf8 | 1116 | static void raid5_end_read_request(struct bio * bi, int error) |
1da177e4 LT |
1117 | { |
1118 | struct stripe_head *sh = bi->bi_private; | |
1119 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 1120 | int disks = sh->disks, i; |
1da177e4 | 1121 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
d6950432 N |
1122 | char b[BDEVNAME_SIZE]; |
1123 | mdk_rdev_t *rdev; | |
1da177e4 | 1124 | |
1da177e4 LT |
1125 | |
1126 | for (i=0 ; i<disks; i++) | |
1127 | if (bi == &sh->dev[i].req) | |
1128 | break; | |
1129 | ||
45b4233c DW |
1130 | pr_debug("end_read_request %llu/%d, count: %d, uptodate %d.\n", |
1131 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), | |
1da177e4 LT |
1132 | uptodate); |
1133 | if (i == disks) { | |
1134 | BUG(); | |
6712ecf8 | 1135 | return; |
1da177e4 LT |
1136 | } |
1137 | ||
1138 | if (uptodate) { | |
1da177e4 | 1139 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 1140 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
d6950432 N |
1141 | rdev = conf->disks[i].rdev; |
1142 | printk(KERN_INFO "raid5:%s: read error corrected (%lu sectors at %llu on %s)\n", | |
1143 | mdname(conf->mddev), STRIPE_SECTORS, | |
1144 | (unsigned long long)sh->sector + rdev->data_offset, | |
1145 | bdevname(rdev->bdev, b)); | |
4e5314b5 N |
1146 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1147 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
1148 | } | |
ba22dcbf N |
1149 | if (atomic_read(&conf->disks[i].rdev->read_errors)) |
1150 | atomic_set(&conf->disks[i].rdev->read_errors, 0); | |
1da177e4 | 1151 | } else { |
d6950432 | 1152 | const char *bdn = bdevname(conf->disks[i].rdev->bdev, b); |
ba22dcbf | 1153 | int retry = 0; |
d6950432 N |
1154 | rdev = conf->disks[i].rdev; |
1155 | ||
1da177e4 | 1156 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 1157 | atomic_inc(&rdev->read_errors); |
ba22dcbf | 1158 | if (conf->mddev->degraded) |
d6950432 N |
1159 | printk(KERN_WARNING "raid5:%s: read error not correctable (sector %llu on %s).\n", |
1160 | mdname(conf->mddev), | |
1161 | (unsigned long long)sh->sector + rdev->data_offset, | |
1162 | bdn); | |
ba22dcbf | 1163 | else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) |
4e5314b5 | 1164 | /* Oh, no!!! */ |
d6950432 N |
1165 | printk(KERN_WARNING "raid5:%s: read error NOT corrected!! (sector %llu on %s).\n", |
1166 | mdname(conf->mddev), | |
1167 | (unsigned long long)sh->sector + rdev->data_offset, | |
1168 | bdn); | |
1169 | else if (atomic_read(&rdev->read_errors) | |
ba22dcbf | 1170 | > conf->max_nr_stripes) |
14f8d26b | 1171 | printk(KERN_WARNING |
d6950432 N |
1172 | "raid5:%s: Too many read errors, failing device %s.\n", |
1173 | mdname(conf->mddev), bdn); | |
ba22dcbf N |
1174 | else |
1175 | retry = 1; | |
1176 | if (retry) | |
1177 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
1178 | else { | |
4e5314b5 N |
1179 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1180 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
d6950432 | 1181 | md_error(conf->mddev, rdev); |
ba22dcbf | 1182 | } |
1da177e4 LT |
1183 | } |
1184 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1da177e4 LT |
1185 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1186 | set_bit(STRIPE_HANDLE, &sh->state); | |
1187 | release_stripe(sh); | |
1da177e4 LT |
1188 | } |
1189 | ||
6712ecf8 | 1190 | static void raid5_end_write_request (struct bio *bi, int error) |
1da177e4 LT |
1191 | { |
1192 | struct stripe_head *sh = bi->bi_private; | |
1193 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 1194 | int disks = sh->disks, i; |
1da177e4 LT |
1195 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
1196 | ||
1da177e4 LT |
1197 | for (i=0 ; i<disks; i++) |
1198 | if (bi == &sh->dev[i].req) | |
1199 | break; | |
1200 | ||
45b4233c | 1201 | pr_debug("end_write_request %llu/%d, count %d, uptodate: %d.\n", |
1da177e4 LT |
1202 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
1203 | uptodate); | |
1204 | if (i == disks) { | |
1205 | BUG(); | |
6712ecf8 | 1206 | return; |
1da177e4 LT |
1207 | } |
1208 | ||
1da177e4 LT |
1209 | if (!uptodate) |
1210 | md_error(conf->mddev, conf->disks[i].rdev); | |
1211 | ||
1212 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1213 | ||
1214 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1215 | set_bit(STRIPE_HANDLE, &sh->state); | |
c04be0aa | 1216 | release_stripe(sh); |
1da177e4 LT |
1217 | } |
1218 | ||
1219 | ||
1220 | static sector_t compute_blocknr(struct stripe_head *sh, int i); | |
1221 | ||
1222 | static void raid5_build_block (struct stripe_head *sh, int i) | |
1223 | { | |
1224 | struct r5dev *dev = &sh->dev[i]; | |
1225 | ||
1226 | bio_init(&dev->req); | |
1227 | dev->req.bi_io_vec = &dev->vec; | |
1228 | dev->req.bi_vcnt++; | |
1229 | dev->req.bi_max_vecs++; | |
1230 | dev->vec.bv_page = dev->page; | |
1231 | dev->vec.bv_len = STRIPE_SIZE; | |
1232 | dev->vec.bv_offset = 0; | |
1233 | ||
1234 | dev->req.bi_sector = sh->sector; | |
1235 | dev->req.bi_private = sh; | |
1236 | ||
1237 | dev->flags = 0; | |
16a53ecc | 1238 | dev->sector = compute_blocknr(sh, i); |
1da177e4 LT |
1239 | } |
1240 | ||
1241 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
1242 | { | |
1243 | char b[BDEVNAME_SIZE]; | |
1244 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
45b4233c | 1245 | pr_debug("raid5: error called\n"); |
1da177e4 | 1246 | |
b2d444d7 | 1247 | if (!test_bit(Faulty, &rdev->flags)) { |
850b2b42 | 1248 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
c04be0aa N |
1249 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1250 | unsigned long flags; | |
1251 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1252 | mddev->degraded++; |
c04be0aa | 1253 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1254 | /* |
1255 | * if recovery was running, make sure it aborts. | |
1256 | */ | |
1257 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
1258 | } | |
b2d444d7 | 1259 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1260 | printk (KERN_ALERT |
1261 | "raid5: Disk failure on %s, disabling device." | |
1262 | " Operation continuing on %d devices\n", | |
02c2de8c | 1263 | bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded); |
1da177e4 | 1264 | } |
16a53ecc | 1265 | } |
1da177e4 LT |
1266 | |
1267 | /* | |
1268 | * Input: a 'big' sector number, | |
1269 | * Output: index of the data and parity disk, and the sector # in them. | |
1270 | */ | |
1271 | static sector_t raid5_compute_sector(sector_t r_sector, unsigned int raid_disks, | |
1272 | unsigned int data_disks, unsigned int * dd_idx, | |
1273 | unsigned int * pd_idx, raid5_conf_t *conf) | |
1274 | { | |
1275 | long stripe; | |
1276 | unsigned long chunk_number; | |
1277 | unsigned int chunk_offset; | |
1278 | sector_t new_sector; | |
1279 | int sectors_per_chunk = conf->chunk_size >> 9; | |
1280 | ||
1281 | /* First compute the information on this sector */ | |
1282 | ||
1283 | /* | |
1284 | * Compute the chunk number and the sector offset inside the chunk | |
1285 | */ | |
1286 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
1287 | chunk_number = r_sector; | |
1288 | BUG_ON(r_sector != chunk_number); | |
1289 | ||
1290 | /* | |
1291 | * Compute the stripe number | |
1292 | */ | |
1293 | stripe = chunk_number / data_disks; | |
1294 | ||
1295 | /* | |
1296 | * Compute the data disk and parity disk indexes inside the stripe | |
1297 | */ | |
1298 | *dd_idx = chunk_number % data_disks; | |
1299 | ||
1300 | /* | |
1301 | * Select the parity disk based on the user selected algorithm. | |
1302 | */ | |
16a53ecc N |
1303 | switch(conf->level) { |
1304 | case 4: | |
1da177e4 | 1305 | *pd_idx = data_disks; |
16a53ecc N |
1306 | break; |
1307 | case 5: | |
1308 | switch (conf->algorithm) { | |
1da177e4 LT |
1309 | case ALGORITHM_LEFT_ASYMMETRIC: |
1310 | *pd_idx = data_disks - stripe % raid_disks; | |
1311 | if (*dd_idx >= *pd_idx) | |
1312 | (*dd_idx)++; | |
1313 | break; | |
1314 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1315 | *pd_idx = stripe % raid_disks; | |
1316 | if (*dd_idx >= *pd_idx) | |
1317 | (*dd_idx)++; | |
1318 | break; | |
1319 | case ALGORITHM_LEFT_SYMMETRIC: | |
1320 | *pd_idx = data_disks - stripe % raid_disks; | |
1321 | *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks; | |
1322 | break; | |
1323 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1324 | *pd_idx = stripe % raid_disks; | |
1325 | *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks; | |
1326 | break; | |
1327 | default: | |
14f8d26b | 1328 | printk(KERN_ERR "raid5: unsupported algorithm %d\n", |
1da177e4 | 1329 | conf->algorithm); |
16a53ecc N |
1330 | } |
1331 | break; | |
1332 | case 6: | |
1333 | ||
1334 | /**** FIX THIS ****/ | |
1335 | switch (conf->algorithm) { | |
1336 | case ALGORITHM_LEFT_ASYMMETRIC: | |
1337 | *pd_idx = raid_disks - 1 - (stripe % raid_disks); | |
1338 | if (*pd_idx == raid_disks-1) | |
1339 | (*dd_idx)++; /* Q D D D P */ | |
1340 | else if (*dd_idx >= *pd_idx) | |
1341 | (*dd_idx) += 2; /* D D P Q D */ | |
1342 | break; | |
1343 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1344 | *pd_idx = stripe % raid_disks; | |
1345 | if (*pd_idx == raid_disks-1) | |
1346 | (*dd_idx)++; /* Q D D D P */ | |
1347 | else if (*dd_idx >= *pd_idx) | |
1348 | (*dd_idx) += 2; /* D D P Q D */ | |
1349 | break; | |
1350 | case ALGORITHM_LEFT_SYMMETRIC: | |
1351 | *pd_idx = raid_disks - 1 - (stripe % raid_disks); | |
1352 | *dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks; | |
1353 | break; | |
1354 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1355 | *pd_idx = stripe % raid_disks; | |
1356 | *dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks; | |
1357 | break; | |
1358 | default: | |
1359 | printk (KERN_CRIT "raid6: unsupported algorithm %d\n", | |
1360 | conf->algorithm); | |
1361 | } | |
1362 | break; | |
1da177e4 LT |
1363 | } |
1364 | ||
1365 | /* | |
1366 | * Finally, compute the new sector number | |
1367 | */ | |
1368 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
1369 | return new_sector; | |
1370 | } | |
1371 | ||
1372 | ||
1373 | static sector_t compute_blocknr(struct stripe_head *sh, int i) | |
1374 | { | |
1375 | raid5_conf_t *conf = sh->raid_conf; | |
b875e531 N |
1376 | int raid_disks = sh->disks; |
1377 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
1378 | sector_t new_sector = sh->sector, check; |
1379 | int sectors_per_chunk = conf->chunk_size >> 9; | |
1380 | sector_t stripe; | |
1381 | int chunk_offset; | |
1382 | int chunk_number, dummy1, dummy2, dd_idx = i; | |
1383 | sector_t r_sector; | |
1384 | ||
16a53ecc | 1385 | |
1da177e4 LT |
1386 | chunk_offset = sector_div(new_sector, sectors_per_chunk); |
1387 | stripe = new_sector; | |
1388 | BUG_ON(new_sector != stripe); | |
1389 | ||
16a53ecc N |
1390 | if (i == sh->pd_idx) |
1391 | return 0; | |
1392 | switch(conf->level) { | |
1393 | case 4: break; | |
1394 | case 5: | |
1395 | switch (conf->algorithm) { | |
1da177e4 LT |
1396 | case ALGORITHM_LEFT_ASYMMETRIC: |
1397 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1398 | if (i > sh->pd_idx) | |
1399 | i--; | |
1400 | break; | |
1401 | case ALGORITHM_LEFT_SYMMETRIC: | |
1402 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1403 | if (i < sh->pd_idx) | |
1404 | i += raid_disks; | |
1405 | i -= (sh->pd_idx + 1); | |
1406 | break; | |
1407 | default: | |
14f8d26b | 1408 | printk(KERN_ERR "raid5: unsupported algorithm %d\n", |
16a53ecc N |
1409 | conf->algorithm); |
1410 | } | |
1411 | break; | |
1412 | case 6: | |
16a53ecc N |
1413 | if (i == raid6_next_disk(sh->pd_idx, raid_disks)) |
1414 | return 0; /* It is the Q disk */ | |
1415 | switch (conf->algorithm) { | |
1416 | case ALGORITHM_LEFT_ASYMMETRIC: | |
1417 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1418 | if (sh->pd_idx == raid_disks-1) | |
1419 | i--; /* Q D D D P */ | |
1420 | else if (i > sh->pd_idx) | |
1421 | i -= 2; /* D D P Q D */ | |
1422 | break; | |
1423 | case ALGORITHM_LEFT_SYMMETRIC: | |
1424 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1425 | if (sh->pd_idx == raid_disks-1) | |
1426 | i--; /* Q D D D P */ | |
1427 | else { | |
1428 | /* D D P Q D */ | |
1429 | if (i < sh->pd_idx) | |
1430 | i += raid_disks; | |
1431 | i -= (sh->pd_idx + 2); | |
1432 | } | |
1433 | break; | |
1434 | default: | |
1435 | printk (KERN_CRIT "raid6: unsupported algorithm %d\n", | |
1da177e4 | 1436 | conf->algorithm); |
16a53ecc N |
1437 | } |
1438 | break; | |
1da177e4 LT |
1439 | } |
1440 | ||
1441 | chunk_number = stripe * data_disks + i; | |
1442 | r_sector = (sector_t)chunk_number * sectors_per_chunk + chunk_offset; | |
1443 | ||
1444 | check = raid5_compute_sector (r_sector, raid_disks, data_disks, &dummy1, &dummy2, conf); | |
1445 | if (check != sh->sector || dummy1 != dd_idx || dummy2 != sh->pd_idx) { | |
14f8d26b | 1446 | printk(KERN_ERR "compute_blocknr: map not correct\n"); |
1da177e4 LT |
1447 | return 0; |
1448 | } | |
1449 | return r_sector; | |
1450 | } | |
1451 | ||
1452 | ||
1453 | ||
1454 | /* | |
16a53ecc N |
1455 | * Copy data between a page in the stripe cache, and one or more bion |
1456 | * The page could align with the middle of the bio, or there could be | |
1457 | * several bion, each with several bio_vecs, which cover part of the page | |
1458 | * Multiple bion are linked together on bi_next. There may be extras | |
1459 | * at the end of this list. We ignore them. | |
1da177e4 LT |
1460 | */ |
1461 | static void copy_data(int frombio, struct bio *bio, | |
1462 | struct page *page, | |
1463 | sector_t sector) | |
1464 | { | |
1465 | char *pa = page_address(page); | |
1466 | struct bio_vec *bvl; | |
1467 | int i; | |
1468 | int page_offset; | |
1469 | ||
1470 | if (bio->bi_sector >= sector) | |
1471 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
1472 | else | |
1473 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
1474 | bio_for_each_segment(bvl, bio, i) { | |
1475 | int len = bio_iovec_idx(bio,i)->bv_len; | |
1476 | int clen; | |
1477 | int b_offset = 0; | |
1478 | ||
1479 | if (page_offset < 0) { | |
1480 | b_offset = -page_offset; | |
1481 | page_offset += b_offset; | |
1482 | len -= b_offset; | |
1483 | } | |
1484 | ||
1485 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
1486 | clen = STRIPE_SIZE - page_offset; | |
1487 | else clen = len; | |
16a53ecc | 1488 | |
1da177e4 LT |
1489 | if (clen > 0) { |
1490 | char *ba = __bio_kmap_atomic(bio, i, KM_USER0); | |
1491 | if (frombio) | |
1492 | memcpy(pa+page_offset, ba+b_offset, clen); | |
1493 | else | |
1494 | memcpy(ba+b_offset, pa+page_offset, clen); | |
1495 | __bio_kunmap_atomic(ba, KM_USER0); | |
1496 | } | |
1497 | if (clen < len) /* hit end of page */ | |
1498 | break; | |
1499 | page_offset += len; | |
1500 | } | |
1501 | } | |
1502 | ||
9bc89cd8 DW |
1503 | #define check_xor() do { \ |
1504 | if (count == MAX_XOR_BLOCKS) { \ | |
1505 | xor_blocks(count, STRIPE_SIZE, dest, ptr);\ | |
1506 | count = 0; \ | |
1507 | } \ | |
1da177e4 LT |
1508 | } while(0) |
1509 | ||
16a53ecc N |
1510 | static void compute_parity6(struct stripe_head *sh, int method) |
1511 | { | |
1512 | raid6_conf_t *conf = sh->raid_conf; | |
f416885e | 1513 | int i, pd_idx = sh->pd_idx, qd_idx, d0_idx, disks = sh->disks, count; |
16a53ecc N |
1514 | struct bio *chosen; |
1515 | /**** FIX THIS: This could be very bad if disks is close to 256 ****/ | |
1516 | void *ptrs[disks]; | |
1517 | ||
1518 | qd_idx = raid6_next_disk(pd_idx, disks); | |
1519 | d0_idx = raid6_next_disk(qd_idx, disks); | |
1520 | ||
45b4233c | 1521 | pr_debug("compute_parity, stripe %llu, method %d\n", |
16a53ecc N |
1522 | (unsigned long long)sh->sector, method); |
1523 | ||
1524 | switch(method) { | |
1525 | case READ_MODIFY_WRITE: | |
1526 | BUG(); /* READ_MODIFY_WRITE N/A for RAID-6 */ | |
1527 | case RECONSTRUCT_WRITE: | |
1528 | for (i= disks; i-- ;) | |
1529 | if ( i != pd_idx && i != qd_idx && sh->dev[i].towrite ) { | |
1530 | chosen = sh->dev[i].towrite; | |
1531 | sh->dev[i].towrite = NULL; | |
1532 | ||
1533 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1534 | wake_up(&conf->wait_for_overlap); | |
1535 | ||
52e5f9d1 | 1536 | BUG_ON(sh->dev[i].written); |
16a53ecc N |
1537 | sh->dev[i].written = chosen; |
1538 | } | |
1539 | break; | |
1540 | case CHECK_PARITY: | |
1541 | BUG(); /* Not implemented yet */ | |
1542 | } | |
1543 | ||
1544 | for (i = disks; i--;) | |
1545 | if (sh->dev[i].written) { | |
1546 | sector_t sector = sh->dev[i].sector; | |
1547 | struct bio *wbi = sh->dev[i].written; | |
1548 | while (wbi && wbi->bi_sector < sector + STRIPE_SECTORS) { | |
1549 | copy_data(1, wbi, sh->dev[i].page, sector); | |
1550 | wbi = r5_next_bio(wbi, sector); | |
1551 | } | |
1552 | ||
1553 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
1554 | set_bit(R5_UPTODATE, &sh->dev[i].flags); | |
1555 | } | |
1556 | ||
1557 | // switch(method) { | |
1558 | // case RECONSTRUCT_WRITE: | |
1559 | // case CHECK_PARITY: | |
1560 | // case UPDATE_PARITY: | |
1561 | /* Note that unlike RAID-5, the ordering of the disks matters greatly. */ | |
1562 | /* FIX: Is this ordering of drives even remotely optimal? */ | |
1563 | count = 0; | |
1564 | i = d0_idx; | |
1565 | do { | |
1566 | ptrs[count++] = page_address(sh->dev[i].page); | |
1567 | if (count <= disks-2 && !test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1568 | printk("block %d/%d not uptodate on parity calc\n", i,count); | |
1569 | i = raid6_next_disk(i, disks); | |
1570 | } while ( i != d0_idx ); | |
1571 | // break; | |
1572 | // } | |
1573 | ||
1574 | raid6_call.gen_syndrome(disks, STRIPE_SIZE, ptrs); | |
1575 | ||
1576 | switch(method) { | |
1577 | case RECONSTRUCT_WRITE: | |
1578 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1579 | set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); | |
1580 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
1581 | set_bit(R5_LOCKED, &sh->dev[qd_idx].flags); | |
1582 | break; | |
1583 | case UPDATE_PARITY: | |
1584 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1585 | set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); | |
1586 | break; | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | ||
1591 | /* Compute one missing block */ | |
1592 | static void compute_block_1(struct stripe_head *sh, int dd_idx, int nozero) | |
1593 | { | |
f416885e | 1594 | int i, count, disks = sh->disks; |
9bc89cd8 | 1595 | void *ptr[MAX_XOR_BLOCKS], *dest, *p; |
16a53ecc N |
1596 | int pd_idx = sh->pd_idx; |
1597 | int qd_idx = raid6_next_disk(pd_idx, disks); | |
1598 | ||
45b4233c | 1599 | pr_debug("compute_block_1, stripe %llu, idx %d\n", |
16a53ecc N |
1600 | (unsigned long long)sh->sector, dd_idx); |
1601 | ||
1602 | if ( dd_idx == qd_idx ) { | |
1603 | /* We're actually computing the Q drive */ | |
1604 | compute_parity6(sh, UPDATE_PARITY); | |
1605 | } else { | |
9bc89cd8 DW |
1606 | dest = page_address(sh->dev[dd_idx].page); |
1607 | if (!nozero) memset(dest, 0, STRIPE_SIZE); | |
1608 | count = 0; | |
16a53ecc N |
1609 | for (i = disks ; i--; ) { |
1610 | if (i == dd_idx || i == qd_idx) | |
1611 | continue; | |
1612 | p = page_address(sh->dev[i].page); | |
1613 | if (test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1614 | ptr[count++] = p; | |
1615 | else | |
1616 | printk("compute_block() %d, stripe %llu, %d" | |
1617 | " not present\n", dd_idx, | |
1618 | (unsigned long long)sh->sector, i); | |
1619 | ||
1620 | check_xor(); | |
1621 | } | |
9bc89cd8 DW |
1622 | if (count) |
1623 | xor_blocks(count, STRIPE_SIZE, dest, ptr); | |
16a53ecc N |
1624 | if (!nozero) set_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); |
1625 | else clear_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); | |
1626 | } | |
1627 | } | |
1628 | ||
1629 | /* Compute two missing blocks */ | |
1630 | static void compute_block_2(struct stripe_head *sh, int dd_idx1, int dd_idx2) | |
1631 | { | |
f416885e | 1632 | int i, count, disks = sh->disks; |
16a53ecc N |
1633 | int pd_idx = sh->pd_idx; |
1634 | int qd_idx = raid6_next_disk(pd_idx, disks); | |
1635 | int d0_idx = raid6_next_disk(qd_idx, disks); | |
1636 | int faila, failb; | |
1637 | ||
1638 | /* faila and failb are disk numbers relative to d0_idx */ | |
1639 | /* pd_idx become disks-2 and qd_idx become disks-1 */ | |
1640 | faila = (dd_idx1 < d0_idx) ? dd_idx1+(disks-d0_idx) : dd_idx1-d0_idx; | |
1641 | failb = (dd_idx2 < d0_idx) ? dd_idx2+(disks-d0_idx) : dd_idx2-d0_idx; | |
1642 | ||
1643 | BUG_ON(faila == failb); | |
1644 | if ( failb < faila ) { int tmp = faila; faila = failb; failb = tmp; } | |
1645 | ||
45b4233c | 1646 | pr_debug("compute_block_2, stripe %llu, idx %d,%d (%d,%d)\n", |
16a53ecc N |
1647 | (unsigned long long)sh->sector, dd_idx1, dd_idx2, faila, failb); |
1648 | ||
1649 | if ( failb == disks-1 ) { | |
1650 | /* Q disk is one of the missing disks */ | |
1651 | if ( faila == disks-2 ) { | |
1652 | /* Missing P+Q, just recompute */ | |
1653 | compute_parity6(sh, UPDATE_PARITY); | |
1654 | return; | |
1655 | } else { | |
1656 | /* We're missing D+Q; recompute D from P */ | |
1657 | compute_block_1(sh, (dd_idx1 == qd_idx) ? dd_idx2 : dd_idx1, 0); | |
1658 | compute_parity6(sh, UPDATE_PARITY); /* Is this necessary? */ | |
1659 | return; | |
1660 | } | |
1661 | } | |
1662 | ||
1663 | /* We're missing D+P or D+D; build pointer table */ | |
1664 | { | |
1665 | /**** FIX THIS: This could be very bad if disks is close to 256 ****/ | |
1666 | void *ptrs[disks]; | |
1667 | ||
1668 | count = 0; | |
1669 | i = d0_idx; | |
1670 | do { | |
1671 | ptrs[count++] = page_address(sh->dev[i].page); | |
1672 | i = raid6_next_disk(i, disks); | |
1673 | if (i != dd_idx1 && i != dd_idx2 && | |
1674 | !test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1675 | printk("compute_2 with missing block %d/%d\n", count, i); | |
1676 | } while ( i != d0_idx ); | |
1677 | ||
1678 | if ( failb == disks-2 ) { | |
1679 | /* We're missing D+P. */ | |
1680 | raid6_datap_recov(disks, STRIPE_SIZE, faila, ptrs); | |
1681 | } else { | |
1682 | /* We're missing D+D. */ | |
1683 | raid6_2data_recov(disks, STRIPE_SIZE, faila, failb, ptrs); | |
1684 | } | |
1685 | ||
1686 | /* Both the above update both missing blocks */ | |
1687 | set_bit(R5_UPTODATE, &sh->dev[dd_idx1].flags); | |
1688 | set_bit(R5_UPTODATE, &sh->dev[dd_idx2].flags); | |
1689 | } | |
1690 | } | |
1691 | ||
e33129d8 DW |
1692 | static int |
1693 | handle_write_operations5(struct stripe_head *sh, int rcw, int expand) | |
1694 | { | |
1695 | int i, pd_idx = sh->pd_idx, disks = sh->disks; | |
1696 | int locked = 0; | |
1697 | ||
1698 | if (rcw) { | |
1699 | /* if we are not expanding this is a proper write request, and | |
1700 | * there will be bios with new data to be drained into the | |
1701 | * stripe cache | |
1702 | */ | |
1703 | if (!expand) { | |
1704 | set_bit(STRIPE_OP_BIODRAIN, &sh->ops.pending); | |
1705 | sh->ops.count++; | |
1706 | } | |
16a53ecc | 1707 | |
e33129d8 DW |
1708 | set_bit(STRIPE_OP_POSTXOR, &sh->ops.pending); |
1709 | sh->ops.count++; | |
1710 | ||
1711 | for (i = disks; i--; ) { | |
1712 | struct r5dev *dev = &sh->dev[i]; | |
1713 | ||
1714 | if (dev->towrite) { | |
1715 | set_bit(R5_LOCKED, &dev->flags); | |
1716 | if (!expand) | |
1717 | clear_bit(R5_UPTODATE, &dev->flags); | |
1718 | locked++; | |
1719 | } | |
1720 | } | |
1721 | } else { | |
1722 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || | |
1723 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
1724 | ||
1725 | set_bit(STRIPE_OP_PREXOR, &sh->ops.pending); | |
1726 | set_bit(STRIPE_OP_BIODRAIN, &sh->ops.pending); | |
1727 | set_bit(STRIPE_OP_POSTXOR, &sh->ops.pending); | |
1728 | ||
1729 | sh->ops.count += 3; | |
1730 | ||
1731 | for (i = disks; i--; ) { | |
1732 | struct r5dev *dev = &sh->dev[i]; | |
1733 | if (i == pd_idx) | |
1734 | continue; | |
1735 | ||
1736 | /* For a read-modify write there may be blocks that are | |
1737 | * locked for reading while others are ready to be | |
1738 | * written so we distinguish these blocks by the | |
1739 | * R5_Wantprexor bit | |
1740 | */ | |
1741 | if (dev->towrite && | |
1742 | (test_bit(R5_UPTODATE, &dev->flags) || | |
1743 | test_bit(R5_Wantcompute, &dev->flags))) { | |
1744 | set_bit(R5_Wantprexor, &dev->flags); | |
1745 | set_bit(R5_LOCKED, &dev->flags); | |
1746 | clear_bit(R5_UPTODATE, &dev->flags); | |
1747 | locked++; | |
1748 | } | |
1749 | } | |
1750 | } | |
1751 | ||
1752 | /* keep the parity disk locked while asynchronous operations | |
1753 | * are in flight | |
1754 | */ | |
1755 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
1756 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1757 | locked++; | |
1758 | ||
1759 | pr_debug("%s: stripe %llu locked: %d pending: %lx\n", | |
1760 | __FUNCTION__, (unsigned long long)sh->sector, | |
1761 | locked, sh->ops.pending); | |
1762 | ||
1763 | return locked; | |
1764 | } | |
16a53ecc | 1765 | |
1da177e4 LT |
1766 | /* |
1767 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 1768 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
1769 | * The bi_next chain must be in order. |
1770 | */ | |
1771 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, int forwrite) | |
1772 | { | |
1773 | struct bio **bip; | |
1774 | raid5_conf_t *conf = sh->raid_conf; | |
72626685 | 1775 | int firstwrite=0; |
1da177e4 | 1776 | |
45b4233c | 1777 | pr_debug("adding bh b#%llu to stripe s#%llu\n", |
1da177e4 LT |
1778 | (unsigned long long)bi->bi_sector, |
1779 | (unsigned long long)sh->sector); | |
1780 | ||
1781 | ||
1782 | spin_lock(&sh->lock); | |
1783 | spin_lock_irq(&conf->device_lock); | |
72626685 | 1784 | if (forwrite) { |
1da177e4 | 1785 | bip = &sh->dev[dd_idx].towrite; |
72626685 N |
1786 | if (*bip == NULL && sh->dev[dd_idx].written == NULL) |
1787 | firstwrite = 1; | |
1788 | } else | |
1da177e4 LT |
1789 | bip = &sh->dev[dd_idx].toread; |
1790 | while (*bip && (*bip)->bi_sector < bi->bi_sector) { | |
1791 | if ((*bip)->bi_sector + ((*bip)->bi_size >> 9) > bi->bi_sector) | |
1792 | goto overlap; | |
1793 | bip = & (*bip)->bi_next; | |
1794 | } | |
1795 | if (*bip && (*bip)->bi_sector < bi->bi_sector + ((bi->bi_size)>>9)) | |
1796 | goto overlap; | |
1797 | ||
78bafebd | 1798 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
1799 | if (*bip) |
1800 | bi->bi_next = *bip; | |
1801 | *bip = bi; | |
1802 | bi->bi_phys_segments ++; | |
1803 | spin_unlock_irq(&conf->device_lock); | |
1804 | spin_unlock(&sh->lock); | |
1805 | ||
45b4233c | 1806 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", |
1da177e4 LT |
1807 | (unsigned long long)bi->bi_sector, |
1808 | (unsigned long long)sh->sector, dd_idx); | |
1809 | ||
72626685 | 1810 | if (conf->mddev->bitmap && firstwrite) { |
72626685 N |
1811 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, |
1812 | STRIPE_SECTORS, 0); | |
ae3c20cc | 1813 | sh->bm_seq = conf->seq_flush+1; |
72626685 N |
1814 | set_bit(STRIPE_BIT_DELAY, &sh->state); |
1815 | } | |
1816 | ||
1da177e4 LT |
1817 | if (forwrite) { |
1818 | /* check if page is covered */ | |
1819 | sector_t sector = sh->dev[dd_idx].sector; | |
1820 | for (bi=sh->dev[dd_idx].towrite; | |
1821 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
1822 | bi && bi->bi_sector <= sector; | |
1823 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { | |
1824 | if (bi->bi_sector + (bi->bi_size>>9) >= sector) | |
1825 | sector = bi->bi_sector + (bi->bi_size>>9); | |
1826 | } | |
1827 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
1828 | set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags); | |
1829 | } | |
1830 | return 1; | |
1831 | ||
1832 | overlap: | |
1833 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
1834 | spin_unlock_irq(&conf->device_lock); | |
1835 | spin_unlock(&sh->lock); | |
1836 | return 0; | |
1837 | } | |
1838 | ||
29269553 N |
1839 | static void end_reshape(raid5_conf_t *conf); |
1840 | ||
16a53ecc N |
1841 | static int page_is_zero(struct page *p) |
1842 | { | |
1843 | char *a = page_address(p); | |
1844 | return ((*(u32*)a) == 0 && | |
1845 | memcmp(a, a+4, STRIPE_SIZE-4)==0); | |
1846 | } | |
1847 | ||
ccfcc3c1 N |
1848 | static int stripe_to_pdidx(sector_t stripe, raid5_conf_t *conf, int disks) |
1849 | { | |
1850 | int sectors_per_chunk = conf->chunk_size >> 9; | |
ccfcc3c1 | 1851 | int pd_idx, dd_idx; |
2d2063ce CQH |
1852 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
1853 | ||
b875e531 N |
1854 | raid5_compute_sector(stripe * (disks - conf->max_degraded) |
1855 | *sectors_per_chunk + chunk_offset, | |
1856 | disks, disks - conf->max_degraded, | |
1857 | &dd_idx, &pd_idx, conf); | |
ccfcc3c1 N |
1858 | return pd_idx; |
1859 | } | |
1860 | ||
a4456856 DW |
1861 | static void |
1862 | handle_requests_to_failed_array(raid5_conf_t *conf, struct stripe_head *sh, | |
1863 | struct stripe_head_state *s, int disks, | |
1864 | struct bio **return_bi) | |
1865 | { | |
1866 | int i; | |
1867 | for (i = disks; i--; ) { | |
1868 | struct bio *bi; | |
1869 | int bitmap_end = 0; | |
1870 | ||
1871 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
1872 | mdk_rdev_t *rdev; | |
1873 | rcu_read_lock(); | |
1874 | rdev = rcu_dereference(conf->disks[i].rdev); | |
1875 | if (rdev && test_bit(In_sync, &rdev->flags)) | |
1876 | /* multiple read failures in one stripe */ | |
1877 | md_error(conf->mddev, rdev); | |
1878 | rcu_read_unlock(); | |
1879 | } | |
1880 | spin_lock_irq(&conf->device_lock); | |
1881 | /* fail all writes first */ | |
1882 | bi = sh->dev[i].towrite; | |
1883 | sh->dev[i].towrite = NULL; | |
1884 | if (bi) { | |
1885 | s->to_write--; | |
1886 | bitmap_end = 1; | |
1887 | } | |
1888 | ||
1889 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1890 | wake_up(&conf->wait_for_overlap); | |
1891 | ||
1892 | while (bi && bi->bi_sector < | |
1893 | sh->dev[i].sector + STRIPE_SECTORS) { | |
1894 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
1895 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
1896 | if (--bi->bi_phys_segments == 0) { | |
1897 | md_write_end(conf->mddev); | |
1898 | bi->bi_next = *return_bi; | |
1899 | *return_bi = bi; | |
1900 | } | |
1901 | bi = nextbi; | |
1902 | } | |
1903 | /* and fail all 'written' */ | |
1904 | bi = sh->dev[i].written; | |
1905 | sh->dev[i].written = NULL; | |
1906 | if (bi) bitmap_end = 1; | |
1907 | while (bi && bi->bi_sector < | |
1908 | sh->dev[i].sector + STRIPE_SECTORS) { | |
1909 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
1910 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
1911 | if (--bi->bi_phys_segments == 0) { | |
1912 | md_write_end(conf->mddev); | |
1913 | bi->bi_next = *return_bi; | |
1914 | *return_bi = bi; | |
1915 | } | |
1916 | bi = bi2; | |
1917 | } | |
1918 | ||
b5e98d65 DW |
1919 | /* fail any reads if this device is non-operational and |
1920 | * the data has not reached the cache yet. | |
1921 | */ | |
1922 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
1923 | (!test_bit(R5_Insync, &sh->dev[i].flags) || | |
1924 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
a4456856 DW |
1925 | bi = sh->dev[i].toread; |
1926 | sh->dev[i].toread = NULL; | |
1927 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1928 | wake_up(&conf->wait_for_overlap); | |
1929 | if (bi) s->to_read--; | |
1930 | while (bi && bi->bi_sector < | |
1931 | sh->dev[i].sector + STRIPE_SECTORS) { | |
1932 | struct bio *nextbi = | |
1933 | r5_next_bio(bi, sh->dev[i].sector); | |
1934 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
1935 | if (--bi->bi_phys_segments == 0) { | |
1936 | bi->bi_next = *return_bi; | |
1937 | *return_bi = bi; | |
1938 | } | |
1939 | bi = nextbi; | |
1940 | } | |
1941 | } | |
1942 | spin_unlock_irq(&conf->device_lock); | |
1943 | if (bitmap_end) | |
1944 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
1945 | STRIPE_SECTORS, 0, 0); | |
1946 | } | |
1947 | ||
1948 | } | |
1949 | ||
f38e1219 DW |
1950 | /* __handle_issuing_new_read_requests5 - returns 0 if there are no more disks |
1951 | * to process | |
1952 | */ | |
1953 | static int __handle_issuing_new_read_requests5(struct stripe_head *sh, | |
1954 | struct stripe_head_state *s, int disk_idx, int disks) | |
1955 | { | |
1956 | struct r5dev *dev = &sh->dev[disk_idx]; | |
1957 | struct r5dev *failed_dev = &sh->dev[s->failed_num]; | |
1958 | ||
1959 | /* don't schedule compute operations or reads on the parity block while | |
1960 | * a check is in flight | |
1961 | */ | |
1962 | if ((disk_idx == sh->pd_idx) && | |
1963 | test_bit(STRIPE_OP_CHECK, &sh->ops.pending)) | |
1964 | return ~0; | |
1965 | ||
1966 | /* is the data in this block needed, and can we get it? */ | |
1967 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
1968 | !test_bit(R5_UPTODATE, &dev->flags) && (dev->toread || | |
1969 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || | |
1970 | s->syncing || s->expanding || (s->failed && | |
1971 | (failed_dev->toread || (failed_dev->towrite && | |
1972 | !test_bit(R5_OVERWRITE, &failed_dev->flags) | |
1973 | ))))) { | |
1974 | /* 1/ We would like to get this block, possibly by computing it, | |
1975 | * but we might not be able to. | |
1976 | * | |
1977 | * 2/ Since parity check operations potentially make the parity | |
1978 | * block !uptodate it will need to be refreshed before any | |
1979 | * compute operations on data disks are scheduled. | |
1980 | * | |
1981 | * 3/ We hold off parity block re-reads until check operations | |
1982 | * have quiesced. | |
1983 | */ | |
1984 | if ((s->uptodate == disks - 1) && | |
1985 | !test_bit(STRIPE_OP_CHECK, &sh->ops.pending)) { | |
1986 | set_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending); | |
1987 | set_bit(R5_Wantcompute, &dev->flags); | |
1988 | sh->ops.target = disk_idx; | |
1989 | s->req_compute = 1; | |
1990 | sh->ops.count++; | |
1991 | /* Careful: from this point on 'uptodate' is in the eye | |
1992 | * of raid5_run_ops which services 'compute' operations | |
1993 | * before writes. R5_Wantcompute flags a block that will | |
1994 | * be R5_UPTODATE by the time it is needed for a | |
1995 | * subsequent operation. | |
1996 | */ | |
1997 | s->uptodate++; | |
1998 | return 0; /* uptodate + compute == disks */ | |
1999 | } else if ((s->uptodate < disks - 1) && | |
2000 | test_bit(R5_Insync, &dev->flags)) { | |
2001 | /* Note: we hold off compute operations while checks are | |
2002 | * in flight, but we still prefer 'compute' over 'read' | |
2003 | * hence we only read if (uptodate < * disks-1) | |
2004 | */ | |
2005 | set_bit(R5_LOCKED, &dev->flags); | |
2006 | set_bit(R5_Wantread, &dev->flags); | |
2007 | if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending)) | |
2008 | sh->ops.count++; | |
2009 | s->locked++; | |
2010 | pr_debug("Reading block %d (sync=%d)\n", disk_idx, | |
2011 | s->syncing); | |
2012 | } | |
2013 | } | |
2014 | ||
2015 | return ~0; | |
2016 | } | |
2017 | ||
a4456856 DW |
2018 | static void handle_issuing_new_read_requests5(struct stripe_head *sh, |
2019 | struct stripe_head_state *s, int disks) | |
2020 | { | |
2021 | int i; | |
f38e1219 DW |
2022 | |
2023 | /* Clear completed compute operations. Parity recovery | |
2024 | * (STRIPE_OP_MOD_REPAIR_PD) implies a write-back which is handled | |
2025 | * later on in this routine | |
2026 | */ | |
2027 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.complete) && | |
2028 | !test_bit(STRIPE_OP_MOD_REPAIR_PD, &sh->ops.pending)) { | |
2029 | clear_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.complete); | |
2030 | clear_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.ack); | |
2031 | clear_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending); | |
2032 | } | |
2033 | ||
2034 | /* look for blocks to read/compute, skip this if a compute | |
2035 | * is already in flight, or if the stripe contents are in the | |
2036 | * midst of changing due to a write | |
2037 | */ | |
2038 | if (!test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending) && | |
2039 | !test_bit(STRIPE_OP_PREXOR, &sh->ops.pending) && | |
2040 | !test_bit(STRIPE_OP_POSTXOR, &sh->ops.pending)) { | |
2041 | for (i = disks; i--; ) | |
2042 | if (__handle_issuing_new_read_requests5( | |
2043 | sh, s, i, disks) == 0) | |
2044 | break; | |
a4456856 DW |
2045 | } |
2046 | set_bit(STRIPE_HANDLE, &sh->state); | |
2047 | } | |
2048 | ||
2049 | static void handle_issuing_new_read_requests6(struct stripe_head *sh, | |
2050 | struct stripe_head_state *s, struct r6_state *r6s, | |
2051 | int disks) | |
2052 | { | |
2053 | int i; | |
2054 | for (i = disks; i--; ) { | |
2055 | struct r5dev *dev = &sh->dev[i]; | |
2056 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2057 | !test_bit(R5_UPTODATE, &dev->flags) && | |
2058 | (dev->toread || (dev->towrite && | |
2059 | !test_bit(R5_OVERWRITE, &dev->flags)) || | |
2060 | s->syncing || s->expanding || | |
2061 | (s->failed >= 1 && | |
2062 | (sh->dev[r6s->failed_num[0]].toread || | |
2063 | s->to_write)) || | |
2064 | (s->failed >= 2 && | |
2065 | (sh->dev[r6s->failed_num[1]].toread || | |
2066 | s->to_write)))) { | |
2067 | /* we would like to get this block, possibly | |
2068 | * by computing it, but we might not be able to | |
2069 | */ | |
2070 | if (s->uptodate == disks-1) { | |
45b4233c | 2071 | pr_debug("Computing stripe %llu block %d\n", |
a4456856 DW |
2072 | (unsigned long long)sh->sector, i); |
2073 | compute_block_1(sh, i, 0); | |
2074 | s->uptodate++; | |
2075 | } else if ( s->uptodate == disks-2 && s->failed >= 2 ) { | |
2076 | /* Computing 2-failure is *very* expensive; only | |
2077 | * do it if failed >= 2 | |
2078 | */ | |
2079 | int other; | |
2080 | for (other = disks; other--; ) { | |
2081 | if (other == i) | |
2082 | continue; | |
2083 | if (!test_bit(R5_UPTODATE, | |
2084 | &sh->dev[other].flags)) | |
2085 | break; | |
2086 | } | |
2087 | BUG_ON(other < 0); | |
45b4233c | 2088 | pr_debug("Computing stripe %llu blocks %d,%d\n", |
a4456856 DW |
2089 | (unsigned long long)sh->sector, |
2090 | i, other); | |
2091 | compute_block_2(sh, i, other); | |
2092 | s->uptodate += 2; | |
2093 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
2094 | set_bit(R5_LOCKED, &dev->flags); | |
2095 | set_bit(R5_Wantread, &dev->flags); | |
2096 | s->locked++; | |
45b4233c | 2097 | pr_debug("Reading block %d (sync=%d)\n", |
a4456856 DW |
2098 | i, s->syncing); |
2099 | } | |
2100 | } | |
2101 | } | |
2102 | set_bit(STRIPE_HANDLE, &sh->state); | |
2103 | } | |
2104 | ||
2105 | ||
2106 | /* handle_completed_write_requests | |
2107 | * any written block on an uptodate or failed drive can be returned. | |
2108 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
2109 | * never LOCKED, so we don't need to test 'failed' directly. | |
2110 | */ | |
2111 | static void handle_completed_write_requests(raid5_conf_t *conf, | |
2112 | struct stripe_head *sh, int disks, struct bio **return_bi) | |
2113 | { | |
2114 | int i; | |
2115 | struct r5dev *dev; | |
2116 | ||
2117 | for (i = disks; i--; ) | |
2118 | if (sh->dev[i].written) { | |
2119 | dev = &sh->dev[i]; | |
2120 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2121 | test_bit(R5_UPTODATE, &dev->flags)) { | |
2122 | /* We can return any write requests */ | |
2123 | struct bio *wbi, *wbi2; | |
2124 | int bitmap_end = 0; | |
45b4233c | 2125 | pr_debug("Return write for disc %d\n", i); |
a4456856 DW |
2126 | spin_lock_irq(&conf->device_lock); |
2127 | wbi = dev->written; | |
2128 | dev->written = NULL; | |
2129 | while (wbi && wbi->bi_sector < | |
2130 | dev->sector + STRIPE_SECTORS) { | |
2131 | wbi2 = r5_next_bio(wbi, dev->sector); | |
2132 | if (--wbi->bi_phys_segments == 0) { | |
2133 | md_write_end(conf->mddev); | |
2134 | wbi->bi_next = *return_bi; | |
2135 | *return_bi = wbi; | |
2136 | } | |
2137 | wbi = wbi2; | |
2138 | } | |
2139 | if (dev->towrite == NULL) | |
2140 | bitmap_end = 1; | |
2141 | spin_unlock_irq(&conf->device_lock); | |
2142 | if (bitmap_end) | |
2143 | bitmap_endwrite(conf->mddev->bitmap, | |
2144 | sh->sector, | |
2145 | STRIPE_SECTORS, | |
2146 | !test_bit(STRIPE_DEGRADED, &sh->state), | |
2147 | 0); | |
2148 | } | |
2149 | } | |
2150 | } | |
2151 | ||
2152 | static void handle_issuing_new_write_requests5(raid5_conf_t *conf, | |
2153 | struct stripe_head *sh, struct stripe_head_state *s, int disks) | |
2154 | { | |
2155 | int rmw = 0, rcw = 0, i; | |
2156 | for (i = disks; i--; ) { | |
2157 | /* would I have to read this buffer for read_modify_write */ | |
2158 | struct r5dev *dev = &sh->dev[i]; | |
2159 | if ((dev->towrite || i == sh->pd_idx) && | |
2160 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2161 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2162 | test_bit(R5_Wantcompute, &dev->flags))) { | |
a4456856 DW |
2163 | if (test_bit(R5_Insync, &dev->flags)) |
2164 | rmw++; | |
2165 | else | |
2166 | rmw += 2*disks; /* cannot read it */ | |
2167 | } | |
2168 | /* Would I have to read this buffer for reconstruct_write */ | |
2169 | if (!test_bit(R5_OVERWRITE, &dev->flags) && i != sh->pd_idx && | |
2170 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2171 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2172 | test_bit(R5_Wantcompute, &dev->flags))) { | |
2173 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
a4456856 DW |
2174 | else |
2175 | rcw += 2*disks; | |
2176 | } | |
2177 | } | |
45b4233c | 2178 | pr_debug("for sector %llu, rmw=%d rcw=%d\n", |
a4456856 DW |
2179 | (unsigned long long)sh->sector, rmw, rcw); |
2180 | set_bit(STRIPE_HANDLE, &sh->state); | |
2181 | if (rmw < rcw && rmw > 0) | |
2182 | /* prefer read-modify-write, but need to get some data */ | |
2183 | for (i = disks; i--; ) { | |
2184 | struct r5dev *dev = &sh->dev[i]; | |
2185 | if ((dev->towrite || i == sh->pd_idx) && | |
2186 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2187 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2188 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2189 | test_bit(R5_Insync, &dev->flags)) { |
2190 | if ( | |
2191 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2192 | pr_debug("Read_old block " |
a4456856 DW |
2193 | "%d for r-m-w\n", i); |
2194 | set_bit(R5_LOCKED, &dev->flags); | |
2195 | set_bit(R5_Wantread, &dev->flags); | |
830ea016 DW |
2196 | if (!test_and_set_bit( |
2197 | STRIPE_OP_IO, &sh->ops.pending)) | |
2198 | sh->ops.count++; | |
a4456856 DW |
2199 | s->locked++; |
2200 | } else { | |
2201 | set_bit(STRIPE_DELAYED, &sh->state); | |
2202 | set_bit(STRIPE_HANDLE, &sh->state); | |
2203 | } | |
2204 | } | |
2205 | } | |
2206 | if (rcw <= rmw && rcw > 0) | |
2207 | /* want reconstruct write, but need to get some data */ | |
2208 | for (i = disks; i--; ) { | |
2209 | struct r5dev *dev = &sh->dev[i]; | |
2210 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
2211 | i != sh->pd_idx && | |
2212 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2213 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2214 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2215 | test_bit(R5_Insync, &dev->flags)) { |
2216 | if ( | |
2217 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2218 | pr_debug("Read_old block " |
a4456856 DW |
2219 | "%d for Reconstruct\n", i); |
2220 | set_bit(R5_LOCKED, &dev->flags); | |
2221 | set_bit(R5_Wantread, &dev->flags); | |
830ea016 DW |
2222 | if (!test_and_set_bit( |
2223 | STRIPE_OP_IO, &sh->ops.pending)) | |
2224 | sh->ops.count++; | |
a4456856 DW |
2225 | s->locked++; |
2226 | } else { | |
2227 | set_bit(STRIPE_DELAYED, &sh->state); | |
2228 | set_bit(STRIPE_HANDLE, &sh->state); | |
2229 | } | |
2230 | } | |
2231 | } | |
2232 | /* now if nothing is locked, and if we have enough data, | |
2233 | * we can start a write request | |
2234 | */ | |
f38e1219 DW |
2235 | /* since handle_stripe can be called at any time we need to handle the |
2236 | * case where a compute block operation has been submitted and then a | |
2237 | * subsequent call wants to start a write request. raid5_run_ops only | |
2238 | * handles the case where compute block and postxor are requested | |
2239 | * simultaneously. If this is not the case then new writes need to be | |
2240 | * held off until the compute completes. | |
2241 | */ | |
2242 | if ((s->req_compute || | |
2243 | !test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending)) && | |
2244 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
2245 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) | |
e33129d8 | 2246 | s->locked += handle_write_operations5(sh, rcw == 0, 0); |
a4456856 DW |
2247 | } |
2248 | ||
2249 | static void handle_issuing_new_write_requests6(raid5_conf_t *conf, | |
2250 | struct stripe_head *sh, struct stripe_head_state *s, | |
2251 | struct r6_state *r6s, int disks) | |
2252 | { | |
2253 | int rcw = 0, must_compute = 0, pd_idx = sh->pd_idx, i; | |
2254 | int qd_idx = r6s->qd_idx; | |
2255 | for (i = disks; i--; ) { | |
2256 | struct r5dev *dev = &sh->dev[i]; | |
2257 | /* Would I have to read this buffer for reconstruct_write */ | |
2258 | if (!test_bit(R5_OVERWRITE, &dev->flags) | |
2259 | && i != pd_idx && i != qd_idx | |
2260 | && (!test_bit(R5_LOCKED, &dev->flags) | |
2261 | ) && | |
2262 | !test_bit(R5_UPTODATE, &dev->flags)) { | |
2263 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
2264 | else { | |
45b4233c | 2265 | pr_debug("raid6: must_compute: " |
a4456856 DW |
2266 | "disk %d flags=%#lx\n", i, dev->flags); |
2267 | must_compute++; | |
2268 | } | |
2269 | } | |
2270 | } | |
45b4233c | 2271 | pr_debug("for sector %llu, rcw=%d, must_compute=%d\n", |
a4456856 DW |
2272 | (unsigned long long)sh->sector, rcw, must_compute); |
2273 | set_bit(STRIPE_HANDLE, &sh->state); | |
2274 | ||
2275 | if (rcw > 0) | |
2276 | /* want reconstruct write, but need to get some data */ | |
2277 | for (i = disks; i--; ) { | |
2278 | struct r5dev *dev = &sh->dev[i]; | |
2279 | if (!test_bit(R5_OVERWRITE, &dev->flags) | |
2280 | && !(s->failed == 0 && (i == pd_idx || i == qd_idx)) | |
2281 | && !test_bit(R5_LOCKED, &dev->flags) && | |
2282 | !test_bit(R5_UPTODATE, &dev->flags) && | |
2283 | test_bit(R5_Insync, &dev->flags)) { | |
2284 | if ( | |
2285 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2286 | pr_debug("Read_old stripe %llu " |
a4456856 DW |
2287 | "block %d for Reconstruct\n", |
2288 | (unsigned long long)sh->sector, i); | |
2289 | set_bit(R5_LOCKED, &dev->flags); | |
2290 | set_bit(R5_Wantread, &dev->flags); | |
2291 | s->locked++; | |
2292 | } else { | |
45b4233c | 2293 | pr_debug("Request delayed stripe %llu " |
a4456856 DW |
2294 | "block %d for Reconstruct\n", |
2295 | (unsigned long long)sh->sector, i); | |
2296 | set_bit(STRIPE_DELAYED, &sh->state); | |
2297 | set_bit(STRIPE_HANDLE, &sh->state); | |
2298 | } | |
2299 | } | |
2300 | } | |
2301 | /* now if nothing is locked, and if we have enough data, we can start a | |
2302 | * write request | |
2303 | */ | |
2304 | if (s->locked == 0 && rcw == 0 && | |
2305 | !test_bit(STRIPE_BIT_DELAY, &sh->state)) { | |
2306 | if (must_compute > 0) { | |
2307 | /* We have failed blocks and need to compute them */ | |
2308 | switch (s->failed) { | |
2309 | case 0: | |
2310 | BUG(); | |
2311 | case 1: | |
2312 | compute_block_1(sh, r6s->failed_num[0], 0); | |
2313 | break; | |
2314 | case 2: | |
2315 | compute_block_2(sh, r6s->failed_num[0], | |
2316 | r6s->failed_num[1]); | |
2317 | break; | |
2318 | default: /* This request should have been failed? */ | |
2319 | BUG(); | |
2320 | } | |
2321 | } | |
2322 | ||
45b4233c | 2323 | pr_debug("Computing parity for stripe %llu\n", |
a4456856 DW |
2324 | (unsigned long long)sh->sector); |
2325 | compute_parity6(sh, RECONSTRUCT_WRITE); | |
2326 | /* now every locked buffer is ready to be written */ | |
2327 | for (i = disks; i--; ) | |
2328 | if (test_bit(R5_LOCKED, &sh->dev[i].flags)) { | |
45b4233c | 2329 | pr_debug("Writing stripe %llu block %d\n", |
a4456856 DW |
2330 | (unsigned long long)sh->sector, i); |
2331 | s->locked++; | |
2332 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
2333 | } | |
2334 | /* after a RECONSTRUCT_WRITE, the stripe MUST be in-sync */ | |
2335 | set_bit(STRIPE_INSYNC, &sh->state); | |
2336 | ||
2337 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
2338 | atomic_dec(&conf->preread_active_stripes); | |
2339 | if (atomic_read(&conf->preread_active_stripes) < | |
2340 | IO_THRESHOLD) | |
2341 | md_wakeup_thread(conf->mddev->thread); | |
2342 | } | |
2343 | } | |
2344 | } | |
2345 | ||
2346 | static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, | |
2347 | struct stripe_head_state *s, int disks) | |
2348 | { | |
2349 | set_bit(STRIPE_HANDLE, &sh->state); | |
e89f8962 DW |
2350 | /* Take one of the following actions: |
2351 | * 1/ start a check parity operation if (uptodate == disks) | |
2352 | * 2/ finish a check parity operation and act on the result | |
2353 | * 3/ skip to the writeback section if we previously | |
2354 | * initiated a recovery operation | |
2355 | */ | |
2356 | if (s->failed == 0 && | |
2357 | !test_bit(STRIPE_OP_MOD_REPAIR_PD, &sh->ops.pending)) { | |
2358 | if (!test_and_set_bit(STRIPE_OP_CHECK, &sh->ops.pending)) { | |
2359 | BUG_ON(s->uptodate != disks); | |
2360 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); | |
2361 | sh->ops.count++; | |
2362 | s->uptodate--; | |
2363 | } else if ( | |
2364 | test_and_clear_bit(STRIPE_OP_CHECK, &sh->ops.complete)) { | |
2365 | clear_bit(STRIPE_OP_CHECK, &sh->ops.ack); | |
2366 | clear_bit(STRIPE_OP_CHECK, &sh->ops.pending); | |
2367 | ||
2368 | if (sh->ops.zero_sum_result == 0) | |
2369 | /* parity is correct (on disc, | |
2370 | * not in buffer any more) | |
2371 | */ | |
a4456856 DW |
2372 | set_bit(STRIPE_INSYNC, &sh->state); |
2373 | else { | |
e89f8962 DW |
2374 | conf->mddev->resync_mismatches += |
2375 | STRIPE_SECTORS; | |
2376 | if (test_bit( | |
2377 | MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2378 | /* don't try to repair!! */ | |
2379 | set_bit(STRIPE_INSYNC, &sh->state); | |
2380 | else { | |
2381 | set_bit(STRIPE_OP_COMPUTE_BLK, | |
2382 | &sh->ops.pending); | |
2383 | set_bit(STRIPE_OP_MOD_REPAIR_PD, | |
2384 | &sh->ops.pending); | |
2385 | set_bit(R5_Wantcompute, | |
2386 | &sh->dev[sh->pd_idx].flags); | |
2387 | sh->ops.target = sh->pd_idx; | |
2388 | sh->ops.count++; | |
2389 | s->uptodate++; | |
2390 | } | |
a4456856 DW |
2391 | } |
2392 | } | |
2393 | } | |
e89f8962 DW |
2394 | |
2395 | /* check if we can clear a parity disk reconstruct */ | |
2396 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.complete) && | |
2397 | test_bit(STRIPE_OP_MOD_REPAIR_PD, &sh->ops.pending)) { | |
2398 | ||
2399 | clear_bit(STRIPE_OP_MOD_REPAIR_PD, &sh->ops.pending); | |
2400 | clear_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.complete); | |
2401 | clear_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.ack); | |
2402 | clear_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending); | |
2403 | } | |
2404 | ||
2405 | /* Wait for check parity and compute block operations to complete | |
2406 | * before write-back | |
2407 | */ | |
2408 | if (!test_bit(STRIPE_INSYNC, &sh->state) && | |
2409 | !test_bit(STRIPE_OP_CHECK, &sh->ops.pending) && | |
2410 | !test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending)) { | |
a4456856 DW |
2411 | struct r5dev *dev; |
2412 | /* either failed parity check, or recovery is happening */ | |
2413 | if (s->failed == 0) | |
2414 | s->failed_num = sh->pd_idx; | |
2415 | dev = &sh->dev[s->failed_num]; | |
2416 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); | |
2417 | BUG_ON(s->uptodate != disks); | |
2418 | ||
2419 | set_bit(R5_LOCKED, &dev->flags); | |
2420 | set_bit(R5_Wantwrite, &dev->flags); | |
830ea016 DW |
2421 | if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending)) |
2422 | sh->ops.count++; | |
2423 | ||
a4456856 DW |
2424 | clear_bit(STRIPE_DEGRADED, &sh->state); |
2425 | s->locked++; | |
2426 | set_bit(STRIPE_INSYNC, &sh->state); | |
2427 | } | |
2428 | } | |
2429 | ||
2430 | ||
2431 | static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, | |
2432 | struct stripe_head_state *s, | |
2433 | struct r6_state *r6s, struct page *tmp_page, | |
2434 | int disks) | |
2435 | { | |
2436 | int update_p = 0, update_q = 0; | |
2437 | struct r5dev *dev; | |
2438 | int pd_idx = sh->pd_idx; | |
2439 | int qd_idx = r6s->qd_idx; | |
2440 | ||
2441 | set_bit(STRIPE_HANDLE, &sh->state); | |
2442 | ||
2443 | BUG_ON(s->failed > 2); | |
2444 | BUG_ON(s->uptodate < disks); | |
2445 | /* Want to check and possibly repair P and Q. | |
2446 | * However there could be one 'failed' device, in which | |
2447 | * case we can only check one of them, possibly using the | |
2448 | * other to generate missing data | |
2449 | */ | |
2450 | ||
2451 | /* If !tmp_page, we cannot do the calculations, | |
2452 | * but as we have set STRIPE_HANDLE, we will soon be called | |
2453 | * by stripe_handle with a tmp_page - just wait until then. | |
2454 | */ | |
2455 | if (tmp_page) { | |
2456 | if (s->failed == r6s->q_failed) { | |
2457 | /* The only possible failed device holds 'Q', so it | |
2458 | * makes sense to check P (If anything else were failed, | |
2459 | * we would have used P to recreate it). | |
2460 | */ | |
2461 | compute_block_1(sh, pd_idx, 1); | |
2462 | if (!page_is_zero(sh->dev[pd_idx].page)) { | |
2463 | compute_block_1(sh, pd_idx, 0); | |
2464 | update_p = 1; | |
2465 | } | |
2466 | } | |
2467 | if (!r6s->q_failed && s->failed < 2) { | |
2468 | /* q is not failed, and we didn't use it to generate | |
2469 | * anything, so it makes sense to check it | |
2470 | */ | |
2471 | memcpy(page_address(tmp_page), | |
2472 | page_address(sh->dev[qd_idx].page), | |
2473 | STRIPE_SIZE); | |
2474 | compute_parity6(sh, UPDATE_PARITY); | |
2475 | if (memcmp(page_address(tmp_page), | |
2476 | page_address(sh->dev[qd_idx].page), | |
2477 | STRIPE_SIZE) != 0) { | |
2478 | clear_bit(STRIPE_INSYNC, &sh->state); | |
2479 | update_q = 1; | |
2480 | } | |
2481 | } | |
2482 | if (update_p || update_q) { | |
2483 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2484 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2485 | /* don't try to repair!! */ | |
2486 | update_p = update_q = 0; | |
2487 | } | |
2488 | ||
2489 | /* now write out any block on a failed drive, | |
2490 | * or P or Q if they need it | |
2491 | */ | |
2492 | ||
2493 | if (s->failed == 2) { | |
2494 | dev = &sh->dev[r6s->failed_num[1]]; | |
2495 | s->locked++; | |
2496 | set_bit(R5_LOCKED, &dev->flags); | |
2497 | set_bit(R5_Wantwrite, &dev->flags); | |
2498 | } | |
2499 | if (s->failed >= 1) { | |
2500 | dev = &sh->dev[r6s->failed_num[0]]; | |
2501 | s->locked++; | |
2502 | set_bit(R5_LOCKED, &dev->flags); | |
2503 | set_bit(R5_Wantwrite, &dev->flags); | |
2504 | } | |
2505 | ||
2506 | if (update_p) { | |
2507 | dev = &sh->dev[pd_idx]; | |
2508 | s->locked++; | |
2509 | set_bit(R5_LOCKED, &dev->flags); | |
2510 | set_bit(R5_Wantwrite, &dev->flags); | |
2511 | } | |
2512 | if (update_q) { | |
2513 | dev = &sh->dev[qd_idx]; | |
2514 | s->locked++; | |
2515 | set_bit(R5_LOCKED, &dev->flags); | |
2516 | set_bit(R5_Wantwrite, &dev->flags); | |
2517 | } | |
2518 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
2519 | ||
2520 | set_bit(STRIPE_INSYNC, &sh->state); | |
2521 | } | |
2522 | } | |
2523 | ||
2524 | static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, | |
2525 | struct r6_state *r6s) | |
2526 | { | |
2527 | int i; | |
2528 | ||
2529 | /* We have read all the blocks in this stripe and now we need to | |
2530 | * copy some of them into a target stripe for expand. | |
2531 | */ | |
f0a50d37 | 2532 | struct dma_async_tx_descriptor *tx = NULL; |
a4456856 DW |
2533 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
2534 | for (i = 0; i < sh->disks; i++) | |
a2e08551 | 2535 | if (i != sh->pd_idx && (!r6s || i != r6s->qd_idx)) { |
a4456856 DW |
2536 | int dd_idx, pd_idx, j; |
2537 | struct stripe_head *sh2; | |
2538 | ||
2539 | sector_t bn = compute_blocknr(sh, i); | |
2540 | sector_t s = raid5_compute_sector(bn, conf->raid_disks, | |
2541 | conf->raid_disks - | |
2542 | conf->max_degraded, &dd_idx, | |
2543 | &pd_idx, conf); | |
2544 | sh2 = get_active_stripe(conf, s, conf->raid_disks, | |
2545 | pd_idx, 1); | |
2546 | if (sh2 == NULL) | |
2547 | /* so far only the early blocks of this stripe | |
2548 | * have been requested. When later blocks | |
2549 | * get requested, we will try again | |
2550 | */ | |
2551 | continue; | |
2552 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
2553 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
2554 | /* must have already done this block */ | |
2555 | release_stripe(sh2); | |
2556 | continue; | |
2557 | } | |
f0a50d37 DW |
2558 | |
2559 | /* place all the copies on one channel */ | |
2560 | tx = async_memcpy(sh2->dev[dd_idx].page, | |
2561 | sh->dev[i].page, 0, 0, STRIPE_SIZE, | |
2562 | ASYNC_TX_DEP_ACK, tx, NULL, NULL); | |
2563 | ||
a4456856 DW |
2564 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
2565 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
2566 | for (j = 0; j < conf->raid_disks; j++) | |
2567 | if (j != sh2->pd_idx && | |
a2e08551 N |
2568 | (!r6s || j != raid6_next_disk(sh2->pd_idx, |
2569 | sh2->disks)) && | |
a4456856 DW |
2570 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
2571 | break; | |
2572 | if (j == conf->raid_disks) { | |
2573 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
2574 | set_bit(STRIPE_HANDLE, &sh2->state); | |
2575 | } | |
2576 | release_stripe(sh2); | |
f0a50d37 | 2577 | |
a4456856 | 2578 | } |
a2e08551 N |
2579 | /* done submitting copies, wait for them to complete */ |
2580 | if (tx) { | |
2581 | async_tx_ack(tx); | |
2582 | dma_wait_for_async_tx(tx); | |
2583 | } | |
a4456856 | 2584 | } |
1da177e4 LT |
2585 | |
2586 | /* | |
2587 | * handle_stripe - do things to a stripe. | |
2588 | * | |
2589 | * We lock the stripe and then examine the state of various bits | |
2590 | * to see what needs to be done. | |
2591 | * Possible results: | |
2592 | * return some read request which now have data | |
2593 | * return some write requests which are safely on disc | |
2594 | * schedule a read on some buffers | |
2595 | * schedule a write of some buffers | |
2596 | * return confirmation of parity correctness | |
2597 | * | |
1da177e4 LT |
2598 | * buffers are taken off read_list or write_list, and bh_cache buffers |
2599 | * get BH_Lock set before the stripe lock is released. | |
2600 | * | |
2601 | */ | |
a4456856 | 2602 | |
16a53ecc | 2603 | static void handle_stripe5(struct stripe_head *sh) |
1da177e4 LT |
2604 | { |
2605 | raid5_conf_t *conf = sh->raid_conf; | |
a4456856 DW |
2606 | int disks = sh->disks, i; |
2607 | struct bio *return_bi = NULL; | |
2608 | struct stripe_head_state s; | |
1da177e4 | 2609 | struct r5dev *dev; |
d84e0f10 | 2610 | unsigned long pending = 0; |
1da177e4 | 2611 | |
a4456856 | 2612 | memset(&s, 0, sizeof(s)); |
d84e0f10 DW |
2613 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, pd_idx=%d " |
2614 | "ops=%lx:%lx:%lx\n", (unsigned long long)sh->sector, sh->state, | |
2615 | atomic_read(&sh->count), sh->pd_idx, | |
2616 | sh->ops.pending, sh->ops.ack, sh->ops.complete); | |
1da177e4 LT |
2617 | |
2618 | spin_lock(&sh->lock); | |
2619 | clear_bit(STRIPE_HANDLE, &sh->state); | |
2620 | clear_bit(STRIPE_DELAYED, &sh->state); | |
2621 | ||
a4456856 DW |
2622 | s.syncing = test_bit(STRIPE_SYNCING, &sh->state); |
2623 | s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
2624 | s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
1da177e4 LT |
2625 | /* Now to look around and see what can be done */ |
2626 | ||
def6ae26 NB |
2627 | /* clean-up completed biofill operations */ |
2628 | if (test_bit(STRIPE_OP_BIOFILL, &sh->ops.complete)) { | |
2629 | clear_bit(STRIPE_OP_BIOFILL, &sh->ops.pending); | |
2630 | clear_bit(STRIPE_OP_BIOFILL, &sh->ops.ack); | |
2631 | clear_bit(STRIPE_OP_BIOFILL, &sh->ops.complete); | |
2632 | } | |
2633 | ||
9910f16a | 2634 | rcu_read_lock(); |
1da177e4 LT |
2635 | for (i=disks; i--; ) { |
2636 | mdk_rdev_t *rdev; | |
a4456856 | 2637 | struct r5dev *dev = &sh->dev[i]; |
1da177e4 | 2638 | clear_bit(R5_Insync, &dev->flags); |
1da177e4 | 2639 | |
b5e98d65 DW |
2640 | pr_debug("check %d: state 0x%lx toread %p read %p write %p " |
2641 | "written %p\n", i, dev->flags, dev->toread, dev->read, | |
2642 | dev->towrite, dev->written); | |
2643 | ||
2644 | /* maybe we can request a biofill operation | |
2645 | * | |
2646 | * new wantfill requests are only permitted while | |
2647 | * STRIPE_OP_BIOFILL is clear | |
2648 | */ | |
2649 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
2650 | !test_bit(STRIPE_OP_BIOFILL, &sh->ops.pending)) | |
2651 | set_bit(R5_Wantfill, &dev->flags); | |
1da177e4 LT |
2652 | |
2653 | /* now count some things */ | |
a4456856 DW |
2654 | if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; |
2655 | if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; | |
f38e1219 | 2656 | if (test_bit(R5_Wantcompute, &dev->flags)) s.compute++; |
1da177e4 | 2657 | |
b5e98d65 DW |
2658 | if (test_bit(R5_Wantfill, &dev->flags)) |
2659 | s.to_fill++; | |
2660 | else if (dev->toread) | |
a4456856 | 2661 | s.to_read++; |
1da177e4 | 2662 | if (dev->towrite) { |
a4456856 | 2663 | s.to_write++; |
1da177e4 | 2664 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
a4456856 | 2665 | s.non_overwrite++; |
1da177e4 | 2666 | } |
a4456856 DW |
2667 | if (dev->written) |
2668 | s.written++; | |
9910f16a | 2669 | rdev = rcu_dereference(conf->disks[i].rdev); |
b2d444d7 | 2670 | if (!rdev || !test_bit(In_sync, &rdev->flags)) { |
14f8d26b | 2671 | /* The ReadError flag will just be confusing now */ |
4e5314b5 N |
2672 | clear_bit(R5_ReadError, &dev->flags); |
2673 | clear_bit(R5_ReWrite, &dev->flags); | |
2674 | } | |
b2d444d7 | 2675 | if (!rdev || !test_bit(In_sync, &rdev->flags) |
4e5314b5 | 2676 | || test_bit(R5_ReadError, &dev->flags)) { |
a4456856 DW |
2677 | s.failed++; |
2678 | s.failed_num = i; | |
1da177e4 LT |
2679 | } else |
2680 | set_bit(R5_Insync, &dev->flags); | |
2681 | } | |
9910f16a | 2682 | rcu_read_unlock(); |
b5e98d65 DW |
2683 | |
2684 | if (s.to_fill && !test_and_set_bit(STRIPE_OP_BIOFILL, &sh->ops.pending)) | |
2685 | sh->ops.count++; | |
2686 | ||
45b4233c | 2687 | pr_debug("locked=%d uptodate=%d to_read=%d" |
1da177e4 | 2688 | " to_write=%d failed=%d failed_num=%d\n", |
a4456856 DW |
2689 | s.locked, s.uptodate, s.to_read, s.to_write, |
2690 | s.failed, s.failed_num); | |
1da177e4 LT |
2691 | /* check if the array has lost two devices and, if so, some requests might |
2692 | * need to be failed | |
2693 | */ | |
a4456856 DW |
2694 | if (s.failed > 1 && s.to_read+s.to_write+s.written) |
2695 | handle_requests_to_failed_array(conf, sh, &s, disks, | |
2696 | &return_bi); | |
2697 | if (s.failed > 1 && s.syncing) { | |
1da177e4 LT |
2698 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
2699 | clear_bit(STRIPE_SYNCING, &sh->state); | |
a4456856 | 2700 | s.syncing = 0; |
1da177e4 LT |
2701 | } |
2702 | ||
2703 | /* might be able to return some write requests if the parity block | |
2704 | * is safe, or on a failed drive | |
2705 | */ | |
2706 | dev = &sh->dev[sh->pd_idx]; | |
a4456856 DW |
2707 | if ( s.written && |
2708 | ((test_bit(R5_Insync, &dev->flags) && | |
2709 | !test_bit(R5_LOCKED, &dev->flags) && | |
2710 | test_bit(R5_UPTODATE, &dev->flags)) || | |
2711 | (s.failed == 1 && s.failed_num == sh->pd_idx))) | |
2712 | handle_completed_write_requests(conf, sh, disks, &return_bi); | |
1da177e4 LT |
2713 | |
2714 | /* Now we might consider reading some blocks, either to check/generate | |
2715 | * parity, or to satisfy requests | |
2716 | * or to load a block that is being partially written. | |
2717 | */ | |
a4456856 | 2718 | if (s.to_read || s.non_overwrite || |
f38e1219 DW |
2719 | (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding || |
2720 | test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending)) | |
a4456856 | 2721 | handle_issuing_new_read_requests5(sh, &s, disks); |
1da177e4 | 2722 | |
e33129d8 DW |
2723 | /* Now we check to see if any write operations have recently |
2724 | * completed | |
2725 | */ | |
2726 | ||
2727 | /* leave prexor set until postxor is done, allows us to distinguish | |
2728 | * a rmw from a rcw during biodrain | |
2729 | */ | |
2730 | if (test_bit(STRIPE_OP_PREXOR, &sh->ops.complete) && | |
2731 | test_bit(STRIPE_OP_POSTXOR, &sh->ops.complete)) { | |
2732 | ||
2733 | clear_bit(STRIPE_OP_PREXOR, &sh->ops.complete); | |
2734 | clear_bit(STRIPE_OP_PREXOR, &sh->ops.ack); | |
2735 | clear_bit(STRIPE_OP_PREXOR, &sh->ops.pending); | |
2736 | ||
2737 | for (i = disks; i--; ) | |
2738 | clear_bit(R5_Wantprexor, &sh->dev[i].flags); | |
2739 | } | |
2740 | ||
2741 | /* if only POSTXOR is set then this is an 'expand' postxor */ | |
2742 | if (test_bit(STRIPE_OP_BIODRAIN, &sh->ops.complete) && | |
2743 | test_bit(STRIPE_OP_POSTXOR, &sh->ops.complete)) { | |
2744 | ||
2745 | clear_bit(STRIPE_OP_BIODRAIN, &sh->ops.complete); | |
2746 | clear_bit(STRIPE_OP_BIODRAIN, &sh->ops.ack); | |
2747 | clear_bit(STRIPE_OP_BIODRAIN, &sh->ops.pending); | |
2748 | ||
2749 | clear_bit(STRIPE_OP_POSTXOR, &sh->ops.complete); | |
2750 | clear_bit(STRIPE_OP_POSTXOR, &sh->ops.ack); | |
2751 | clear_bit(STRIPE_OP_POSTXOR, &sh->ops.pending); | |
2752 | ||
2753 | /* All the 'written' buffers and the parity block are ready to | |
2754 | * be written back to disk | |
2755 | */ | |
2756 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags)); | |
2757 | for (i = disks; i--; ) { | |
2758 | dev = &sh->dev[i]; | |
2759 | if (test_bit(R5_LOCKED, &dev->flags) && | |
2760 | (i == sh->pd_idx || dev->written)) { | |
2761 | pr_debug("Writing block %d\n", i); | |
2762 | set_bit(R5_Wantwrite, &dev->flags); | |
2763 | if (!test_and_set_bit( | |
2764 | STRIPE_OP_IO, &sh->ops.pending)) | |
2765 | sh->ops.count++; | |
2766 | if (!test_bit(R5_Insync, &dev->flags) || | |
2767 | (i == sh->pd_idx && s.failed == 0)) | |
2768 | set_bit(STRIPE_INSYNC, &sh->state); | |
2769 | } | |
2770 | } | |
2771 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
2772 | atomic_dec(&conf->preread_active_stripes); | |
2773 | if (atomic_read(&conf->preread_active_stripes) < | |
2774 | IO_THRESHOLD) | |
2775 | md_wakeup_thread(conf->mddev->thread); | |
2776 | } | |
2777 | } | |
2778 | ||
2779 | /* Now to consider new write requests and what else, if anything | |
2780 | * should be read. We do not handle new writes when: | |
2781 | * 1/ A 'write' operation (copy+xor) is already in flight. | |
2782 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
2783 | * block. | |
2784 | */ | |
2785 | if (s.to_write && !test_bit(STRIPE_OP_POSTXOR, &sh->ops.pending) && | |
2786 | !test_bit(STRIPE_OP_CHECK, &sh->ops.pending)) | |
a4456856 | 2787 | handle_issuing_new_write_requests5(conf, sh, &s, disks); |
1da177e4 LT |
2788 | |
2789 | /* maybe we need to check and possibly fix the parity for this stripe | |
e89f8962 DW |
2790 | * Any reads will already have been scheduled, so we just see if enough |
2791 | * data is available. The parity check is held off while parity | |
2792 | * dependent operations are in flight. | |
1da177e4 | 2793 | */ |
e89f8962 DW |
2794 | if ((s.syncing && s.locked == 0 && |
2795 | !test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending) && | |
2796 | !test_bit(STRIPE_INSYNC, &sh->state)) || | |
2797 | test_bit(STRIPE_OP_CHECK, &sh->ops.pending) || | |
2798 | test_bit(STRIPE_OP_MOD_REPAIR_PD, &sh->ops.pending)) | |
a4456856 | 2799 | handle_parity_checks5(conf, sh, &s, disks); |
e89f8962 | 2800 | |
a4456856 | 2801 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
1da177e4 LT |
2802 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
2803 | clear_bit(STRIPE_SYNCING, &sh->state); | |
2804 | } | |
4e5314b5 N |
2805 | |
2806 | /* If the failed drive is just a ReadError, then we might need to progress | |
2807 | * the repair/check process | |
2808 | */ | |
a4456856 DW |
2809 | if (s.failed == 1 && !conf->mddev->ro && |
2810 | test_bit(R5_ReadError, &sh->dev[s.failed_num].flags) | |
2811 | && !test_bit(R5_LOCKED, &sh->dev[s.failed_num].flags) | |
2812 | && test_bit(R5_UPTODATE, &sh->dev[s.failed_num].flags) | |
4e5314b5 | 2813 | ) { |
a4456856 | 2814 | dev = &sh->dev[s.failed_num]; |
4e5314b5 N |
2815 | if (!test_bit(R5_ReWrite, &dev->flags)) { |
2816 | set_bit(R5_Wantwrite, &dev->flags); | |
830ea016 DW |
2817 | if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending)) |
2818 | sh->ops.count++; | |
4e5314b5 N |
2819 | set_bit(R5_ReWrite, &dev->flags); |
2820 | set_bit(R5_LOCKED, &dev->flags); | |
a4456856 | 2821 | s.locked++; |
4e5314b5 N |
2822 | } else { |
2823 | /* let's read it back */ | |
2824 | set_bit(R5_Wantread, &dev->flags); | |
830ea016 DW |
2825 | if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending)) |
2826 | sh->ops.count++; | |
4e5314b5 | 2827 | set_bit(R5_LOCKED, &dev->flags); |
a4456856 | 2828 | s.locked++; |
4e5314b5 N |
2829 | } |
2830 | } | |
2831 | ||
f0a50d37 DW |
2832 | /* Finish postxor operations initiated by the expansion |
2833 | * process | |
2834 | */ | |
2835 | if (test_bit(STRIPE_OP_POSTXOR, &sh->ops.complete) && | |
2836 | !test_bit(STRIPE_OP_BIODRAIN, &sh->ops.pending)) { | |
2837 | ||
2838 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
2839 | ||
2840 | clear_bit(STRIPE_OP_POSTXOR, &sh->ops.pending); | |
2841 | clear_bit(STRIPE_OP_POSTXOR, &sh->ops.ack); | |
2842 | clear_bit(STRIPE_OP_POSTXOR, &sh->ops.complete); | |
2843 | ||
a4456856 | 2844 | for (i = conf->raid_disks; i--; ) { |
ccfcc3c1 | 2845 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
f0a50d37 DW |
2846 | if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending)) |
2847 | sh->ops.count++; | |
ccfcc3c1 | 2848 | } |
f0a50d37 DW |
2849 | } |
2850 | ||
2851 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && | |
2852 | !test_bit(STRIPE_OP_POSTXOR, &sh->ops.pending)) { | |
2853 | /* Need to write out all blocks after computing parity */ | |
2854 | sh->disks = conf->raid_disks; | |
2855 | sh->pd_idx = stripe_to_pdidx(sh->sector, conf, | |
2856 | conf->raid_disks); | |
a2e08551 | 2857 | s.locked += handle_write_operations5(sh, 1, 1); |
f0a50d37 DW |
2858 | } else if (s.expanded && |
2859 | !test_bit(STRIPE_OP_POSTXOR, &sh->ops.pending)) { | |
ccfcc3c1 | 2860 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
f6705578 | 2861 | atomic_dec(&conf->reshape_stripes); |
ccfcc3c1 N |
2862 | wake_up(&conf->wait_for_overlap); |
2863 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
2864 | } | |
2865 | ||
a4456856 DW |
2866 | if (s.expanding && s.locked == 0) |
2867 | handle_stripe_expansion(conf, sh, NULL); | |
ccfcc3c1 | 2868 | |
d84e0f10 DW |
2869 | if (sh->ops.count) |
2870 | pending = get_stripe_work(sh); | |
2871 | ||
1da177e4 LT |
2872 | spin_unlock(&sh->lock); |
2873 | ||
d84e0f10 DW |
2874 | if (pending) |
2875 | raid5_run_ops(sh, pending); | |
2876 | ||
a4456856 | 2877 | return_io(return_bi); |
1da177e4 | 2878 | |
1da177e4 LT |
2879 | } |
2880 | ||
16a53ecc | 2881 | static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page) |
1da177e4 | 2882 | { |
16a53ecc | 2883 | raid6_conf_t *conf = sh->raid_conf; |
f416885e | 2884 | int disks = sh->disks; |
a4456856 DW |
2885 | struct bio *return_bi = NULL; |
2886 | int i, pd_idx = sh->pd_idx; | |
2887 | struct stripe_head_state s; | |
2888 | struct r6_state r6s; | |
16a53ecc | 2889 | struct r5dev *dev, *pdev, *qdev; |
1da177e4 | 2890 | |
a4456856 | 2891 | r6s.qd_idx = raid6_next_disk(pd_idx, disks); |
45b4233c | 2892 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " |
a4456856 DW |
2893 | "pd_idx=%d, qd_idx=%d\n", |
2894 | (unsigned long long)sh->sector, sh->state, | |
2895 | atomic_read(&sh->count), pd_idx, r6s.qd_idx); | |
2896 | memset(&s, 0, sizeof(s)); | |
72626685 | 2897 | |
16a53ecc N |
2898 | spin_lock(&sh->lock); |
2899 | clear_bit(STRIPE_HANDLE, &sh->state); | |
2900 | clear_bit(STRIPE_DELAYED, &sh->state); | |
2901 | ||
a4456856 DW |
2902 | s.syncing = test_bit(STRIPE_SYNCING, &sh->state); |
2903 | s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
2904 | s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
16a53ecc | 2905 | /* Now to look around and see what can be done */ |
1da177e4 LT |
2906 | |
2907 | rcu_read_lock(); | |
16a53ecc N |
2908 | for (i=disks; i--; ) { |
2909 | mdk_rdev_t *rdev; | |
2910 | dev = &sh->dev[i]; | |
2911 | clear_bit(R5_Insync, &dev->flags); | |
1da177e4 | 2912 | |
45b4233c | 2913 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
16a53ecc N |
2914 | i, dev->flags, dev->toread, dev->towrite, dev->written); |
2915 | /* maybe we can reply to a read */ | |
2916 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread) { | |
2917 | struct bio *rbi, *rbi2; | |
45b4233c | 2918 | pr_debug("Return read for disc %d\n", i); |
16a53ecc N |
2919 | spin_lock_irq(&conf->device_lock); |
2920 | rbi = dev->toread; | |
2921 | dev->toread = NULL; | |
2922 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
2923 | wake_up(&conf->wait_for_overlap); | |
2924 | spin_unlock_irq(&conf->device_lock); | |
2925 | while (rbi && rbi->bi_sector < dev->sector + STRIPE_SECTORS) { | |
2926 | copy_data(0, rbi, dev->page, dev->sector); | |
2927 | rbi2 = r5_next_bio(rbi, dev->sector); | |
2928 | spin_lock_irq(&conf->device_lock); | |
2929 | if (--rbi->bi_phys_segments == 0) { | |
2930 | rbi->bi_next = return_bi; | |
2931 | return_bi = rbi; | |
2932 | } | |
2933 | spin_unlock_irq(&conf->device_lock); | |
2934 | rbi = rbi2; | |
2935 | } | |
2936 | } | |
1da177e4 | 2937 | |
16a53ecc | 2938 | /* now count some things */ |
a4456856 DW |
2939 | if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; |
2940 | if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; | |
1da177e4 | 2941 | |
16a53ecc | 2942 | |
a4456856 DW |
2943 | if (dev->toread) |
2944 | s.to_read++; | |
16a53ecc | 2945 | if (dev->towrite) { |
a4456856 | 2946 | s.to_write++; |
16a53ecc | 2947 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
a4456856 | 2948 | s.non_overwrite++; |
16a53ecc | 2949 | } |
a4456856 DW |
2950 | if (dev->written) |
2951 | s.written++; | |
16a53ecc N |
2952 | rdev = rcu_dereference(conf->disks[i].rdev); |
2953 | if (!rdev || !test_bit(In_sync, &rdev->flags)) { | |
2954 | /* The ReadError flag will just be confusing now */ | |
2955 | clear_bit(R5_ReadError, &dev->flags); | |
2956 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 2957 | } |
16a53ecc N |
2958 | if (!rdev || !test_bit(In_sync, &rdev->flags) |
2959 | || test_bit(R5_ReadError, &dev->flags)) { | |
a4456856 DW |
2960 | if (s.failed < 2) |
2961 | r6s.failed_num[s.failed] = i; | |
2962 | s.failed++; | |
16a53ecc N |
2963 | } else |
2964 | set_bit(R5_Insync, &dev->flags); | |
1da177e4 LT |
2965 | } |
2966 | rcu_read_unlock(); | |
45b4233c | 2967 | pr_debug("locked=%d uptodate=%d to_read=%d" |
16a53ecc | 2968 | " to_write=%d failed=%d failed_num=%d,%d\n", |
a4456856 DW |
2969 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, |
2970 | r6s.failed_num[0], r6s.failed_num[1]); | |
2971 | /* check if the array has lost >2 devices and, if so, some requests | |
2972 | * might need to be failed | |
16a53ecc | 2973 | */ |
a4456856 DW |
2974 | if (s.failed > 2 && s.to_read+s.to_write+s.written) |
2975 | handle_requests_to_failed_array(conf, sh, &s, disks, | |
2976 | &return_bi); | |
2977 | if (s.failed > 2 && s.syncing) { | |
16a53ecc N |
2978 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
2979 | clear_bit(STRIPE_SYNCING, &sh->state); | |
a4456856 | 2980 | s.syncing = 0; |
16a53ecc N |
2981 | } |
2982 | ||
2983 | /* | |
2984 | * might be able to return some write requests if the parity blocks | |
2985 | * are safe, or on a failed drive | |
2986 | */ | |
2987 | pdev = &sh->dev[pd_idx]; | |
a4456856 DW |
2988 | r6s.p_failed = (s.failed >= 1 && r6s.failed_num[0] == pd_idx) |
2989 | || (s.failed >= 2 && r6s.failed_num[1] == pd_idx); | |
2990 | qdev = &sh->dev[r6s.qd_idx]; | |
2991 | r6s.q_failed = (s.failed >= 1 && r6s.failed_num[0] == r6s.qd_idx) | |
2992 | || (s.failed >= 2 && r6s.failed_num[1] == r6s.qd_idx); | |
2993 | ||
2994 | if ( s.written && | |
2995 | ( r6s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
16a53ecc | 2996 | && !test_bit(R5_LOCKED, &pdev->flags) |
a4456856 DW |
2997 | && test_bit(R5_UPTODATE, &pdev->flags)))) && |
2998 | ( r6s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
16a53ecc | 2999 | && !test_bit(R5_LOCKED, &qdev->flags) |
a4456856 DW |
3000 | && test_bit(R5_UPTODATE, &qdev->flags))))) |
3001 | handle_completed_write_requests(conf, sh, disks, &return_bi); | |
16a53ecc N |
3002 | |
3003 | /* Now we might consider reading some blocks, either to check/generate | |
3004 | * parity, or to satisfy requests | |
3005 | * or to load a block that is being partially written. | |
3006 | */ | |
a4456856 DW |
3007 | if (s.to_read || s.non_overwrite || (s.to_write && s.failed) || |
3008 | (s.syncing && (s.uptodate < disks)) || s.expanding) | |
3009 | handle_issuing_new_read_requests6(sh, &s, &r6s, disks); | |
16a53ecc N |
3010 | |
3011 | /* now to consider writing and what else, if anything should be read */ | |
a4456856 DW |
3012 | if (s.to_write) |
3013 | handle_issuing_new_write_requests6(conf, sh, &s, &r6s, disks); | |
16a53ecc N |
3014 | |
3015 | /* maybe we need to check and possibly fix the parity for this stripe | |
a4456856 DW |
3016 | * Any reads will already have been scheduled, so we just see if enough |
3017 | * data is available | |
16a53ecc | 3018 | */ |
a4456856 DW |
3019 | if (s.syncing && s.locked == 0 && !test_bit(STRIPE_INSYNC, &sh->state)) |
3020 | handle_parity_checks6(conf, sh, &s, &r6s, tmp_page, disks); | |
16a53ecc | 3021 | |
a4456856 | 3022 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
16a53ecc N |
3023 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
3024 | clear_bit(STRIPE_SYNCING, &sh->state); | |
3025 | } | |
3026 | ||
3027 | /* If the failed drives are just a ReadError, then we might need | |
3028 | * to progress the repair/check process | |
3029 | */ | |
a4456856 DW |
3030 | if (s.failed <= 2 && !conf->mddev->ro) |
3031 | for (i = 0; i < s.failed; i++) { | |
3032 | dev = &sh->dev[r6s.failed_num[i]]; | |
16a53ecc N |
3033 | if (test_bit(R5_ReadError, &dev->flags) |
3034 | && !test_bit(R5_LOCKED, &dev->flags) | |
3035 | && test_bit(R5_UPTODATE, &dev->flags) | |
3036 | ) { | |
3037 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
3038 | set_bit(R5_Wantwrite, &dev->flags); | |
3039 | set_bit(R5_ReWrite, &dev->flags); | |
3040 | set_bit(R5_LOCKED, &dev->flags); | |
3041 | } else { | |
3042 | /* let's read it back */ | |
3043 | set_bit(R5_Wantread, &dev->flags); | |
3044 | set_bit(R5_LOCKED, &dev->flags); | |
3045 | } | |
3046 | } | |
3047 | } | |
f416885e | 3048 | |
a4456856 | 3049 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state)) { |
f416885e N |
3050 | /* Need to write out all blocks after computing P&Q */ |
3051 | sh->disks = conf->raid_disks; | |
3052 | sh->pd_idx = stripe_to_pdidx(sh->sector, conf, | |
3053 | conf->raid_disks); | |
3054 | compute_parity6(sh, RECONSTRUCT_WRITE); | |
3055 | for (i = conf->raid_disks ; i-- ; ) { | |
3056 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 | 3057 | s.locked++; |
f416885e N |
3058 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
3059 | } | |
3060 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
a4456856 | 3061 | } else if (s.expanded) { |
f416885e N |
3062 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
3063 | atomic_dec(&conf->reshape_stripes); | |
3064 | wake_up(&conf->wait_for_overlap); | |
3065 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
3066 | } | |
3067 | ||
a4456856 DW |
3068 | if (s.expanding && s.locked == 0) |
3069 | handle_stripe_expansion(conf, sh, &r6s); | |
f416885e | 3070 | |
16a53ecc N |
3071 | spin_unlock(&sh->lock); |
3072 | ||
a4456856 | 3073 | return_io(return_bi); |
16a53ecc | 3074 | |
16a53ecc N |
3075 | for (i=disks; i-- ;) { |
3076 | int rw; | |
3077 | struct bio *bi; | |
3078 | mdk_rdev_t *rdev; | |
3079 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) | |
802ba064 | 3080 | rw = WRITE; |
16a53ecc | 3081 | else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) |
802ba064 | 3082 | rw = READ; |
16a53ecc N |
3083 | else |
3084 | continue; | |
3085 | ||
3086 | bi = &sh->dev[i].req; | |
3087 | ||
3088 | bi->bi_rw = rw; | |
802ba064 | 3089 | if (rw == WRITE) |
16a53ecc N |
3090 | bi->bi_end_io = raid5_end_write_request; |
3091 | else | |
3092 | bi->bi_end_io = raid5_end_read_request; | |
3093 | ||
3094 | rcu_read_lock(); | |
3095 | rdev = rcu_dereference(conf->disks[i].rdev); | |
3096 | if (rdev && test_bit(Faulty, &rdev->flags)) | |
3097 | rdev = NULL; | |
3098 | if (rdev) | |
3099 | atomic_inc(&rdev->nr_pending); | |
3100 | rcu_read_unlock(); | |
3101 | ||
3102 | if (rdev) { | |
a4456856 | 3103 | if (s.syncing || s.expanding || s.expanded) |
16a53ecc N |
3104 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
3105 | ||
3106 | bi->bi_bdev = rdev->bdev; | |
45b4233c | 3107 | pr_debug("for %llu schedule op %ld on disc %d\n", |
16a53ecc N |
3108 | (unsigned long long)sh->sector, bi->bi_rw, i); |
3109 | atomic_inc(&sh->count); | |
3110 | bi->bi_sector = sh->sector + rdev->data_offset; | |
3111 | bi->bi_flags = 1 << BIO_UPTODATE; | |
3112 | bi->bi_vcnt = 1; | |
3113 | bi->bi_max_vecs = 1; | |
3114 | bi->bi_idx = 0; | |
3115 | bi->bi_io_vec = &sh->dev[i].vec; | |
3116 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; | |
3117 | bi->bi_io_vec[0].bv_offset = 0; | |
3118 | bi->bi_size = STRIPE_SIZE; | |
3119 | bi->bi_next = NULL; | |
3120 | if (rw == WRITE && | |
3121 | test_bit(R5_ReWrite, &sh->dev[i].flags)) | |
3122 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); | |
3123 | generic_make_request(bi); | |
3124 | } else { | |
802ba064 | 3125 | if (rw == WRITE) |
16a53ecc | 3126 | set_bit(STRIPE_DEGRADED, &sh->state); |
45b4233c | 3127 | pr_debug("skip op %ld on disc %d for sector %llu\n", |
16a53ecc N |
3128 | bi->bi_rw, i, (unsigned long long)sh->sector); |
3129 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
3130 | set_bit(STRIPE_HANDLE, &sh->state); | |
3131 | } | |
3132 | } | |
3133 | } | |
3134 | ||
3135 | static void handle_stripe(struct stripe_head *sh, struct page *tmp_page) | |
3136 | { | |
3137 | if (sh->raid_conf->level == 6) | |
3138 | handle_stripe6(sh, tmp_page); | |
3139 | else | |
3140 | handle_stripe5(sh); | |
3141 | } | |
3142 | ||
3143 | ||
3144 | ||
3145 | static void raid5_activate_delayed(raid5_conf_t *conf) | |
3146 | { | |
3147 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
3148 | while (!list_empty(&conf->delayed_list)) { | |
3149 | struct list_head *l = conf->delayed_list.next; | |
3150 | struct stripe_head *sh; | |
3151 | sh = list_entry(l, struct stripe_head, lru); | |
3152 | list_del_init(l); | |
3153 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3154 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3155 | atomic_inc(&conf->preread_active_stripes); | |
3156 | list_add_tail(&sh->lru, &conf->handle_list); | |
3157 | } | |
3158 | } | |
3159 | } | |
3160 | ||
3161 | static void activate_bit_delay(raid5_conf_t *conf) | |
3162 | { | |
3163 | /* device_lock is held */ | |
3164 | struct list_head head; | |
3165 | list_add(&head, &conf->bitmap_list); | |
3166 | list_del_init(&conf->bitmap_list); | |
3167 | while (!list_empty(&head)) { | |
3168 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
3169 | list_del_init(&sh->lru); | |
3170 | atomic_inc(&sh->count); | |
3171 | __release_stripe(conf, sh); | |
3172 | } | |
3173 | } | |
3174 | ||
3175 | static void unplug_slaves(mddev_t *mddev) | |
3176 | { | |
3177 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3178 | int i; | |
3179 | ||
3180 | rcu_read_lock(); | |
3181 | for (i=0; i<mddev->raid_disks; i++) { | |
3182 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); | |
3183 | if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { | |
165125e1 | 3184 | struct request_queue *r_queue = bdev_get_queue(rdev->bdev); |
16a53ecc N |
3185 | |
3186 | atomic_inc(&rdev->nr_pending); | |
3187 | rcu_read_unlock(); | |
3188 | ||
2ad8b1ef | 3189 | blk_unplug(r_queue); |
16a53ecc N |
3190 | |
3191 | rdev_dec_pending(rdev, mddev); | |
3192 | rcu_read_lock(); | |
3193 | } | |
3194 | } | |
3195 | rcu_read_unlock(); | |
3196 | } | |
3197 | ||
165125e1 | 3198 | static void raid5_unplug_device(struct request_queue *q) |
16a53ecc N |
3199 | { |
3200 | mddev_t *mddev = q->queuedata; | |
3201 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3202 | unsigned long flags; | |
3203 | ||
3204 | spin_lock_irqsave(&conf->device_lock, flags); | |
3205 | ||
3206 | if (blk_remove_plug(q)) { | |
3207 | conf->seq_flush++; | |
3208 | raid5_activate_delayed(conf); | |
72626685 | 3209 | } |
1da177e4 LT |
3210 | md_wakeup_thread(mddev->thread); |
3211 | ||
3212 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3213 | ||
3214 | unplug_slaves(mddev); | |
3215 | } | |
3216 | ||
f022b2fd N |
3217 | static int raid5_congested(void *data, int bits) |
3218 | { | |
3219 | mddev_t *mddev = data; | |
3220 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3221 | ||
3222 | /* No difference between reads and writes. Just check | |
3223 | * how busy the stripe_cache is | |
3224 | */ | |
3225 | if (conf->inactive_blocked) | |
3226 | return 1; | |
3227 | if (conf->quiesce) | |
3228 | return 1; | |
3229 | if (list_empty_careful(&conf->inactive_list)) | |
3230 | return 1; | |
3231 | ||
3232 | return 0; | |
3233 | } | |
3234 | ||
23032a0e RBJ |
3235 | /* We want read requests to align with chunks where possible, |
3236 | * but write requests don't need to. | |
3237 | */ | |
165125e1 | 3238 | static int raid5_mergeable_bvec(struct request_queue *q, struct bio *bio, struct bio_vec *biovec) |
23032a0e RBJ |
3239 | { |
3240 | mddev_t *mddev = q->queuedata; | |
3241 | sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev); | |
3242 | int max; | |
3243 | unsigned int chunk_sectors = mddev->chunk_size >> 9; | |
3244 | unsigned int bio_sectors = bio->bi_size >> 9; | |
3245 | ||
802ba064 | 3246 | if (bio_data_dir(bio) == WRITE) |
23032a0e RBJ |
3247 | return biovec->bv_len; /* always allow writes to be mergeable */ |
3248 | ||
3249 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; | |
3250 | if (max < 0) max = 0; | |
3251 | if (max <= biovec->bv_len && bio_sectors == 0) | |
3252 | return biovec->bv_len; | |
3253 | else | |
3254 | return max; | |
3255 | } | |
3256 | ||
f679623f RBJ |
3257 | |
3258 | static int in_chunk_boundary(mddev_t *mddev, struct bio *bio) | |
3259 | { | |
3260 | sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev); | |
3261 | unsigned int chunk_sectors = mddev->chunk_size >> 9; | |
3262 | unsigned int bio_sectors = bio->bi_size >> 9; | |
3263 | ||
3264 | return chunk_sectors >= | |
3265 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
3266 | } | |
3267 | ||
46031f9a RBJ |
3268 | /* |
3269 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
3270 | * later sampled by raid5d. | |
3271 | */ | |
3272 | static void add_bio_to_retry(struct bio *bi,raid5_conf_t *conf) | |
3273 | { | |
3274 | unsigned long flags; | |
3275 | ||
3276 | spin_lock_irqsave(&conf->device_lock, flags); | |
3277 | ||
3278 | bi->bi_next = conf->retry_read_aligned_list; | |
3279 | conf->retry_read_aligned_list = bi; | |
3280 | ||
3281 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3282 | md_wakeup_thread(conf->mddev->thread); | |
3283 | } | |
3284 | ||
3285 | ||
3286 | static struct bio *remove_bio_from_retry(raid5_conf_t *conf) | |
3287 | { | |
3288 | struct bio *bi; | |
3289 | ||
3290 | bi = conf->retry_read_aligned; | |
3291 | if (bi) { | |
3292 | conf->retry_read_aligned = NULL; | |
3293 | return bi; | |
3294 | } | |
3295 | bi = conf->retry_read_aligned_list; | |
3296 | if(bi) { | |
387bb173 | 3297 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a RBJ |
3298 | bi->bi_next = NULL; |
3299 | bi->bi_phys_segments = 1; /* biased count of active stripes */ | |
3300 | bi->bi_hw_segments = 0; /* count of processed stripes */ | |
3301 | } | |
3302 | ||
3303 | return bi; | |
3304 | } | |
3305 | ||
3306 | ||
f679623f RBJ |
3307 | /* |
3308 | * The "raid5_align_endio" should check if the read succeeded and if it | |
3309 | * did, call bio_endio on the original bio (having bio_put the new bio | |
3310 | * first). | |
3311 | * If the read failed.. | |
3312 | */ | |
6712ecf8 | 3313 | static void raid5_align_endio(struct bio *bi, int error) |
f679623f RBJ |
3314 | { |
3315 | struct bio* raid_bi = bi->bi_private; | |
46031f9a RBJ |
3316 | mddev_t *mddev; |
3317 | raid5_conf_t *conf; | |
3318 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); | |
3319 | mdk_rdev_t *rdev; | |
3320 | ||
f679623f | 3321 | bio_put(bi); |
46031f9a RBJ |
3322 | |
3323 | mddev = raid_bi->bi_bdev->bd_disk->queue->queuedata; | |
3324 | conf = mddev_to_conf(mddev); | |
3325 | rdev = (void*)raid_bi->bi_next; | |
3326 | raid_bi->bi_next = NULL; | |
3327 | ||
3328 | rdev_dec_pending(rdev, conf->mddev); | |
3329 | ||
3330 | if (!error && uptodate) { | |
6712ecf8 | 3331 | bio_endio(raid_bi, 0); |
46031f9a RBJ |
3332 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
3333 | wake_up(&conf->wait_for_stripe); | |
6712ecf8 | 3334 | return; |
46031f9a RBJ |
3335 | } |
3336 | ||
3337 | ||
45b4233c | 3338 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
3339 | |
3340 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
3341 | } |
3342 | ||
387bb173 NB |
3343 | static int bio_fits_rdev(struct bio *bi) |
3344 | { | |
165125e1 | 3345 | struct request_queue *q = bdev_get_queue(bi->bi_bdev); |
387bb173 NB |
3346 | |
3347 | if ((bi->bi_size>>9) > q->max_sectors) | |
3348 | return 0; | |
3349 | blk_recount_segments(q, bi); | |
3350 | if (bi->bi_phys_segments > q->max_phys_segments || | |
3351 | bi->bi_hw_segments > q->max_hw_segments) | |
3352 | return 0; | |
3353 | ||
3354 | if (q->merge_bvec_fn) | |
3355 | /* it's too hard to apply the merge_bvec_fn at this stage, | |
3356 | * just just give up | |
3357 | */ | |
3358 | return 0; | |
3359 | ||
3360 | return 1; | |
3361 | } | |
3362 | ||
3363 | ||
165125e1 | 3364 | static int chunk_aligned_read(struct request_queue *q, struct bio * raid_bio) |
f679623f RBJ |
3365 | { |
3366 | mddev_t *mddev = q->queuedata; | |
3367 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3368 | const unsigned int raid_disks = conf->raid_disks; | |
46031f9a | 3369 | const unsigned int data_disks = raid_disks - conf->max_degraded; |
f679623f RBJ |
3370 | unsigned int dd_idx, pd_idx; |
3371 | struct bio* align_bi; | |
3372 | mdk_rdev_t *rdev; | |
3373 | ||
3374 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
45b4233c | 3375 | pr_debug("chunk_aligned_read : non aligned\n"); |
f679623f RBJ |
3376 | return 0; |
3377 | } | |
3378 | /* | |
3379 | * use bio_clone to make a copy of the bio | |
3380 | */ | |
3381 | align_bi = bio_clone(raid_bio, GFP_NOIO); | |
3382 | if (!align_bi) | |
3383 | return 0; | |
3384 | /* | |
3385 | * set bi_end_io to a new function, and set bi_private to the | |
3386 | * original bio. | |
3387 | */ | |
3388 | align_bi->bi_end_io = raid5_align_endio; | |
3389 | align_bi->bi_private = raid_bio; | |
3390 | /* | |
3391 | * compute position | |
3392 | */ | |
3393 | align_bi->bi_sector = raid5_compute_sector(raid_bio->bi_sector, | |
3394 | raid_disks, | |
3395 | data_disks, | |
3396 | &dd_idx, | |
3397 | &pd_idx, | |
3398 | conf); | |
3399 | ||
3400 | rcu_read_lock(); | |
3401 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
3402 | if (rdev && test_bit(In_sync, &rdev->flags)) { | |
f679623f RBJ |
3403 | atomic_inc(&rdev->nr_pending); |
3404 | rcu_read_unlock(); | |
46031f9a RBJ |
3405 | raid_bio->bi_next = (void*)rdev; |
3406 | align_bi->bi_bdev = rdev->bdev; | |
3407 | align_bi->bi_flags &= ~(1 << BIO_SEG_VALID); | |
3408 | align_bi->bi_sector += rdev->data_offset; | |
3409 | ||
387bb173 NB |
3410 | if (!bio_fits_rdev(align_bi)) { |
3411 | /* too big in some way */ | |
3412 | bio_put(align_bi); | |
3413 | rdev_dec_pending(rdev, mddev); | |
3414 | return 0; | |
3415 | } | |
3416 | ||
46031f9a RBJ |
3417 | spin_lock_irq(&conf->device_lock); |
3418 | wait_event_lock_irq(conf->wait_for_stripe, | |
3419 | conf->quiesce == 0, | |
3420 | conf->device_lock, /* nothing */); | |
3421 | atomic_inc(&conf->active_aligned_reads); | |
3422 | spin_unlock_irq(&conf->device_lock); | |
3423 | ||
f679623f RBJ |
3424 | generic_make_request(align_bi); |
3425 | return 1; | |
3426 | } else { | |
3427 | rcu_read_unlock(); | |
46031f9a | 3428 | bio_put(align_bi); |
f679623f RBJ |
3429 | return 0; |
3430 | } | |
3431 | } | |
3432 | ||
3433 | ||
165125e1 | 3434 | static int make_request(struct request_queue *q, struct bio * bi) |
1da177e4 LT |
3435 | { |
3436 | mddev_t *mddev = q->queuedata; | |
3437 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
1da177e4 LT |
3438 | unsigned int dd_idx, pd_idx; |
3439 | sector_t new_sector; | |
3440 | sector_t logical_sector, last_sector; | |
3441 | struct stripe_head *sh; | |
a362357b | 3442 | const int rw = bio_data_dir(bi); |
f6344757 | 3443 | int remaining; |
1da177e4 | 3444 | |
e5dcdd80 | 3445 | if (unlikely(bio_barrier(bi))) { |
6712ecf8 | 3446 | bio_endio(bi, -EOPNOTSUPP); |
e5dcdd80 N |
3447 | return 0; |
3448 | } | |
3449 | ||
3d310eb7 | 3450 | md_write_start(mddev, bi); |
06d91a5f | 3451 | |
a362357b JA |
3452 | disk_stat_inc(mddev->gendisk, ios[rw]); |
3453 | disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bi)); | |
1da177e4 | 3454 | |
802ba064 | 3455 | if (rw == READ && |
52488615 RBJ |
3456 | mddev->reshape_position == MaxSector && |
3457 | chunk_aligned_read(q,bi)) | |
3458 | return 0; | |
3459 | ||
1da177e4 LT |
3460 | logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
3461 | last_sector = bi->bi_sector + (bi->bi_size>>9); | |
3462 | bi->bi_next = NULL; | |
3463 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
06d91a5f | 3464 | |
1da177e4 LT |
3465 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
3466 | DEFINE_WAIT(w); | |
16a53ecc | 3467 | int disks, data_disks; |
b578d55f | 3468 | |
7ecaa1e6 | 3469 | retry: |
b578d55f | 3470 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
7ecaa1e6 N |
3471 | if (likely(conf->expand_progress == MaxSector)) |
3472 | disks = conf->raid_disks; | |
3473 | else { | |
df8e7f76 N |
3474 | /* spinlock is needed as expand_progress may be |
3475 | * 64bit on a 32bit platform, and so it might be | |
3476 | * possible to see a half-updated value | |
3477 | * Ofcourse expand_progress could change after | |
3478 | * the lock is dropped, so once we get a reference | |
3479 | * to the stripe that we think it is, we will have | |
3480 | * to check again. | |
3481 | */ | |
7ecaa1e6 N |
3482 | spin_lock_irq(&conf->device_lock); |
3483 | disks = conf->raid_disks; | |
3484 | if (logical_sector >= conf->expand_progress) | |
3485 | disks = conf->previous_raid_disks; | |
b578d55f N |
3486 | else { |
3487 | if (logical_sector >= conf->expand_lo) { | |
3488 | spin_unlock_irq(&conf->device_lock); | |
3489 | schedule(); | |
3490 | goto retry; | |
3491 | } | |
3492 | } | |
7ecaa1e6 N |
3493 | spin_unlock_irq(&conf->device_lock); |
3494 | } | |
16a53ecc N |
3495 | data_disks = disks - conf->max_degraded; |
3496 | ||
3497 | new_sector = raid5_compute_sector(logical_sector, disks, data_disks, | |
7ecaa1e6 | 3498 | &dd_idx, &pd_idx, conf); |
45b4233c | 3499 | pr_debug("raid5: make_request, sector %llu logical %llu\n", |
1da177e4 LT |
3500 | (unsigned long long)new_sector, |
3501 | (unsigned long long)logical_sector); | |
3502 | ||
7ecaa1e6 | 3503 | sh = get_active_stripe(conf, new_sector, disks, pd_idx, (bi->bi_rw&RWA_MASK)); |
1da177e4 | 3504 | if (sh) { |
7ecaa1e6 N |
3505 | if (unlikely(conf->expand_progress != MaxSector)) { |
3506 | /* expansion might have moved on while waiting for a | |
df8e7f76 N |
3507 | * stripe, so we must do the range check again. |
3508 | * Expansion could still move past after this | |
3509 | * test, but as we are holding a reference to | |
3510 | * 'sh', we know that if that happens, | |
3511 | * STRIPE_EXPANDING will get set and the expansion | |
3512 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
3513 | */ |
3514 | int must_retry = 0; | |
3515 | spin_lock_irq(&conf->device_lock); | |
3516 | if (logical_sector < conf->expand_progress && | |
3517 | disks == conf->previous_raid_disks) | |
3518 | /* mismatch, need to try again */ | |
3519 | must_retry = 1; | |
3520 | spin_unlock_irq(&conf->device_lock); | |
3521 | if (must_retry) { | |
3522 | release_stripe(sh); | |
3523 | goto retry; | |
3524 | } | |
3525 | } | |
e464eafd N |
3526 | /* FIXME what if we get a false positive because these |
3527 | * are being updated. | |
3528 | */ | |
3529 | if (logical_sector >= mddev->suspend_lo && | |
3530 | logical_sector < mddev->suspend_hi) { | |
3531 | release_stripe(sh); | |
3532 | schedule(); | |
3533 | goto retry; | |
3534 | } | |
7ecaa1e6 N |
3535 | |
3536 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
3537 | !add_stripe_bio(sh, bi, dd_idx, (bi->bi_rw&RW_MASK))) { | |
3538 | /* Stripe is busy expanding or | |
3539 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
3540 | * and wait a while |
3541 | */ | |
3542 | raid5_unplug_device(mddev->queue); | |
3543 | release_stripe(sh); | |
3544 | schedule(); | |
3545 | goto retry; | |
3546 | } | |
3547 | finish_wait(&conf->wait_for_overlap, &w); | |
16a53ecc | 3548 | handle_stripe(sh, NULL); |
1da177e4 | 3549 | release_stripe(sh); |
1da177e4 LT |
3550 | } else { |
3551 | /* cannot get stripe for read-ahead, just give-up */ | |
3552 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
3553 | finish_wait(&conf->wait_for_overlap, &w); | |
3554 | break; | |
3555 | } | |
3556 | ||
3557 | } | |
3558 | spin_lock_irq(&conf->device_lock); | |
f6344757 N |
3559 | remaining = --bi->bi_phys_segments; |
3560 | spin_unlock_irq(&conf->device_lock); | |
3561 | if (remaining == 0) { | |
1da177e4 | 3562 | |
16a53ecc | 3563 | if ( rw == WRITE ) |
1da177e4 | 3564 | md_write_end(mddev); |
6712ecf8 N |
3565 | |
3566 | bi->bi_end_io(bi, | |
c2b00852 N |
3567 | test_bit(BIO_UPTODATE, &bi->bi_flags) |
3568 | ? 0 : -EIO); | |
1da177e4 | 3569 | } |
1da177e4 LT |
3570 | return 0; |
3571 | } | |
3572 | ||
52c03291 | 3573 | static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 3574 | { |
52c03291 N |
3575 | /* reshaping is quite different to recovery/resync so it is |
3576 | * handled quite separately ... here. | |
3577 | * | |
3578 | * On each call to sync_request, we gather one chunk worth of | |
3579 | * destination stripes and flag them as expanding. | |
3580 | * Then we find all the source stripes and request reads. | |
3581 | * As the reads complete, handle_stripe will copy the data | |
3582 | * into the destination stripe and release that stripe. | |
3583 | */ | |
1da177e4 LT |
3584 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; |
3585 | struct stripe_head *sh; | |
ccfcc3c1 N |
3586 | int pd_idx; |
3587 | sector_t first_sector, last_sector; | |
f416885e N |
3588 | int raid_disks = conf->previous_raid_disks; |
3589 | int data_disks = raid_disks - conf->max_degraded; | |
3590 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
3591 | int i; |
3592 | int dd_idx; | |
3593 | sector_t writepos, safepos, gap; | |
3594 | ||
3595 | if (sector_nr == 0 && | |
3596 | conf->expand_progress != 0) { | |
3597 | /* restarting in the middle, skip the initial sectors */ | |
3598 | sector_nr = conf->expand_progress; | |
f416885e | 3599 | sector_div(sector_nr, new_data_disks); |
52c03291 N |
3600 | *skipped = 1; |
3601 | return sector_nr; | |
3602 | } | |
3603 | ||
3604 | /* we update the metadata when there is more than 3Meg | |
3605 | * in the block range (that is rather arbitrary, should | |
3606 | * probably be time based) or when the data about to be | |
3607 | * copied would over-write the source of the data at | |
3608 | * the front of the range. | |
3609 | * i.e. one new_stripe forward from expand_progress new_maps | |
3610 | * to after where expand_lo old_maps to | |
3611 | */ | |
3612 | writepos = conf->expand_progress + | |
f416885e N |
3613 | conf->chunk_size/512*(new_data_disks); |
3614 | sector_div(writepos, new_data_disks); | |
52c03291 | 3615 | safepos = conf->expand_lo; |
f416885e | 3616 | sector_div(safepos, data_disks); |
52c03291 N |
3617 | gap = conf->expand_progress - conf->expand_lo; |
3618 | ||
3619 | if (writepos >= safepos || | |
f416885e | 3620 | gap > (new_data_disks)*3000*2 /*3Meg*/) { |
52c03291 N |
3621 | /* Cannot proceed until we've updated the superblock... */ |
3622 | wait_event(conf->wait_for_overlap, | |
3623 | atomic_read(&conf->reshape_stripes)==0); | |
3624 | mddev->reshape_position = conf->expand_progress; | |
850b2b42 | 3625 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
52c03291 | 3626 | md_wakeup_thread(mddev->thread); |
850b2b42 | 3627 | wait_event(mddev->sb_wait, mddev->flags == 0 || |
52c03291 N |
3628 | kthread_should_stop()); |
3629 | spin_lock_irq(&conf->device_lock); | |
3630 | conf->expand_lo = mddev->reshape_position; | |
3631 | spin_unlock_irq(&conf->device_lock); | |
3632 | wake_up(&conf->wait_for_overlap); | |
3633 | } | |
3634 | ||
3635 | for (i=0; i < conf->chunk_size/512; i+= STRIPE_SECTORS) { | |
3636 | int j; | |
3637 | int skipped = 0; | |
3638 | pd_idx = stripe_to_pdidx(sector_nr+i, conf, conf->raid_disks); | |
3639 | sh = get_active_stripe(conf, sector_nr+i, | |
3640 | conf->raid_disks, pd_idx, 0); | |
3641 | set_bit(STRIPE_EXPANDING, &sh->state); | |
3642 | atomic_inc(&conf->reshape_stripes); | |
3643 | /* If any of this stripe is beyond the end of the old | |
3644 | * array, then we need to zero those blocks | |
3645 | */ | |
3646 | for (j=sh->disks; j--;) { | |
3647 | sector_t s; | |
3648 | if (j == sh->pd_idx) | |
3649 | continue; | |
f416885e N |
3650 | if (conf->level == 6 && |
3651 | j == raid6_next_disk(sh->pd_idx, sh->disks)) | |
3652 | continue; | |
52c03291 N |
3653 | s = compute_blocknr(sh, j); |
3654 | if (s < (mddev->array_size<<1)) { | |
3655 | skipped = 1; | |
3656 | continue; | |
3657 | } | |
3658 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
3659 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
3660 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
3661 | } | |
3662 | if (!skipped) { | |
3663 | set_bit(STRIPE_EXPAND_READY, &sh->state); | |
3664 | set_bit(STRIPE_HANDLE, &sh->state); | |
3665 | } | |
3666 | release_stripe(sh); | |
3667 | } | |
3668 | spin_lock_irq(&conf->device_lock); | |
6d3baf2e | 3669 | conf->expand_progress = (sector_nr + i) * new_data_disks; |
52c03291 N |
3670 | spin_unlock_irq(&conf->device_lock); |
3671 | /* Ok, those stripe are ready. We can start scheduling | |
3672 | * reads on the source stripes. | |
3673 | * The source stripes are determined by mapping the first and last | |
3674 | * block on the destination stripes. | |
3675 | */ | |
52c03291 | 3676 | first_sector = |
f416885e | 3677 | raid5_compute_sector(sector_nr*(new_data_disks), |
52c03291 N |
3678 | raid_disks, data_disks, |
3679 | &dd_idx, &pd_idx, conf); | |
3680 | last_sector = | |
3681 | raid5_compute_sector((sector_nr+conf->chunk_size/512) | |
f416885e | 3682 | *(new_data_disks) -1, |
52c03291 N |
3683 | raid_disks, data_disks, |
3684 | &dd_idx, &pd_idx, conf); | |
3685 | if (last_sector >= (mddev->size<<1)) | |
3686 | last_sector = (mddev->size<<1)-1; | |
3687 | while (first_sector <= last_sector) { | |
f416885e N |
3688 | pd_idx = stripe_to_pdidx(first_sector, conf, |
3689 | conf->previous_raid_disks); | |
52c03291 N |
3690 | sh = get_active_stripe(conf, first_sector, |
3691 | conf->previous_raid_disks, pd_idx, 0); | |
3692 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
3693 | set_bit(STRIPE_HANDLE, &sh->state); | |
3694 | release_stripe(sh); | |
3695 | first_sector += STRIPE_SECTORS; | |
3696 | } | |
3697 | return conf->chunk_size>>9; | |
3698 | } | |
3699 | ||
3700 | /* FIXME go_faster isn't used */ | |
3701 | static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) | |
3702 | { | |
3703 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
3704 | struct stripe_head *sh; | |
3705 | int pd_idx; | |
1da177e4 | 3706 | int raid_disks = conf->raid_disks; |
72626685 N |
3707 | sector_t max_sector = mddev->size << 1; |
3708 | int sync_blocks; | |
16a53ecc N |
3709 | int still_degraded = 0; |
3710 | int i; | |
1da177e4 | 3711 | |
72626685 | 3712 | if (sector_nr >= max_sector) { |
1da177e4 LT |
3713 | /* just being told to finish up .. nothing much to do */ |
3714 | unplug_slaves(mddev); | |
29269553 N |
3715 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
3716 | end_reshape(conf); | |
3717 | return 0; | |
3718 | } | |
72626685 N |
3719 | |
3720 | if (mddev->curr_resync < max_sector) /* aborted */ | |
3721 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
3722 | &sync_blocks, 1); | |
16a53ecc | 3723 | else /* completed sync */ |
72626685 N |
3724 | conf->fullsync = 0; |
3725 | bitmap_close_sync(mddev->bitmap); | |
3726 | ||
1da177e4 LT |
3727 | return 0; |
3728 | } | |
ccfcc3c1 | 3729 | |
52c03291 N |
3730 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3731 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 3732 | |
16a53ecc | 3733 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
3734 | * to resync, then assert that we are finished, because there is |
3735 | * nothing we can do. | |
3736 | */ | |
3285edf1 | 3737 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 3738 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
57afd89f N |
3739 | sector_t rv = (mddev->size << 1) - sector_nr; |
3740 | *skipped = 1; | |
1da177e4 LT |
3741 | return rv; |
3742 | } | |
72626685 | 3743 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
3855ad9f | 3744 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
72626685 N |
3745 | !conf->fullsync && sync_blocks >= STRIPE_SECTORS) { |
3746 | /* we can skip this block, and probably more */ | |
3747 | sync_blocks /= STRIPE_SECTORS; | |
3748 | *skipped = 1; | |
3749 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
3750 | } | |
1da177e4 | 3751 | |
ccfcc3c1 | 3752 | pd_idx = stripe_to_pdidx(sector_nr, conf, raid_disks); |
7ecaa1e6 | 3753 | sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 1); |
1da177e4 | 3754 | if (sh == NULL) { |
7ecaa1e6 | 3755 | sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 0); |
1da177e4 | 3756 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 3757 | * is trying to get access |
1da177e4 | 3758 | */ |
66c006a5 | 3759 | schedule_timeout_uninterruptible(1); |
1da177e4 | 3760 | } |
16a53ecc N |
3761 | /* Need to check if array will still be degraded after recovery/resync |
3762 | * We don't need to check the 'failed' flag as when that gets set, | |
3763 | * recovery aborts. | |
3764 | */ | |
3765 | for (i=0; i<mddev->raid_disks; i++) | |
3766 | if (conf->disks[i].rdev == NULL) | |
3767 | still_degraded = 1; | |
3768 | ||
3769 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
3770 | ||
3771 | spin_lock(&sh->lock); | |
1da177e4 LT |
3772 | set_bit(STRIPE_SYNCING, &sh->state); |
3773 | clear_bit(STRIPE_INSYNC, &sh->state); | |
3774 | spin_unlock(&sh->lock); | |
3775 | ||
16a53ecc | 3776 | handle_stripe(sh, NULL); |
1da177e4 LT |
3777 | release_stripe(sh); |
3778 | ||
3779 | return STRIPE_SECTORS; | |
3780 | } | |
3781 | ||
46031f9a RBJ |
3782 | static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) |
3783 | { | |
3784 | /* We may not be able to submit a whole bio at once as there | |
3785 | * may not be enough stripe_heads available. | |
3786 | * We cannot pre-allocate enough stripe_heads as we may need | |
3787 | * more than exist in the cache (if we allow ever large chunks). | |
3788 | * So we do one stripe head at a time and record in | |
3789 | * ->bi_hw_segments how many have been done. | |
3790 | * | |
3791 | * We *know* that this entire raid_bio is in one chunk, so | |
3792 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
3793 | */ | |
3794 | struct stripe_head *sh; | |
3795 | int dd_idx, pd_idx; | |
3796 | sector_t sector, logical_sector, last_sector; | |
3797 | int scnt = 0; | |
3798 | int remaining; | |
3799 | int handled = 0; | |
3800 | ||
3801 | logical_sector = raid_bio->bi_sector & ~((sector_t)STRIPE_SECTORS-1); | |
3802 | sector = raid5_compute_sector( logical_sector, | |
3803 | conf->raid_disks, | |
3804 | conf->raid_disks - conf->max_degraded, | |
3805 | &dd_idx, | |
3806 | &pd_idx, | |
3807 | conf); | |
3808 | last_sector = raid_bio->bi_sector + (raid_bio->bi_size>>9); | |
3809 | ||
3810 | for (; logical_sector < last_sector; | |
387bb173 NB |
3811 | logical_sector += STRIPE_SECTORS, |
3812 | sector += STRIPE_SECTORS, | |
3813 | scnt++) { | |
46031f9a RBJ |
3814 | |
3815 | if (scnt < raid_bio->bi_hw_segments) | |
3816 | /* already done this stripe */ | |
3817 | continue; | |
3818 | ||
3819 | sh = get_active_stripe(conf, sector, conf->raid_disks, pd_idx, 1); | |
3820 | ||
3821 | if (!sh) { | |
3822 | /* failed to get a stripe - must wait */ | |
3823 | raid_bio->bi_hw_segments = scnt; | |
3824 | conf->retry_read_aligned = raid_bio; | |
3825 | return handled; | |
3826 | } | |
3827 | ||
3828 | set_bit(R5_ReadError, &sh->dev[dd_idx].flags); | |
387bb173 NB |
3829 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) { |
3830 | release_stripe(sh); | |
3831 | raid_bio->bi_hw_segments = scnt; | |
3832 | conf->retry_read_aligned = raid_bio; | |
3833 | return handled; | |
3834 | } | |
3835 | ||
46031f9a RBJ |
3836 | handle_stripe(sh, NULL); |
3837 | release_stripe(sh); | |
3838 | handled++; | |
3839 | } | |
3840 | spin_lock_irq(&conf->device_lock); | |
3841 | remaining = --raid_bio->bi_phys_segments; | |
3842 | spin_unlock_irq(&conf->device_lock); | |
3843 | if (remaining == 0) { | |
46031f9a | 3844 | |
6712ecf8 | 3845 | raid_bio->bi_end_io(raid_bio, |
c2b00852 N |
3846 | test_bit(BIO_UPTODATE, &raid_bio->bi_flags) |
3847 | ? 0 : -EIO); | |
46031f9a RBJ |
3848 | } |
3849 | if (atomic_dec_and_test(&conf->active_aligned_reads)) | |
3850 | wake_up(&conf->wait_for_stripe); | |
3851 | return handled; | |
3852 | } | |
3853 | ||
3854 | ||
3855 | ||
1da177e4 LT |
3856 | /* |
3857 | * This is our raid5 kernel thread. | |
3858 | * | |
3859 | * We scan the hash table for stripes which can be handled now. | |
3860 | * During the scan, completed stripes are saved for us by the interrupt | |
3861 | * handler, so that they will not have to wait for our next wakeup. | |
3862 | */ | |
3863 | static void raid5d (mddev_t *mddev) | |
3864 | { | |
3865 | struct stripe_head *sh; | |
3866 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3867 | int handled; | |
3868 | ||
45b4233c | 3869 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
3870 | |
3871 | md_check_recovery(mddev); | |
1da177e4 LT |
3872 | |
3873 | handled = 0; | |
3874 | spin_lock_irq(&conf->device_lock); | |
3875 | while (1) { | |
3876 | struct list_head *first; | |
46031f9a | 3877 | struct bio *bio; |
1da177e4 | 3878 | |
ae3c20cc | 3879 | if (conf->seq_flush != conf->seq_write) { |
72626685 | 3880 | int seq = conf->seq_flush; |
700e432d | 3881 | spin_unlock_irq(&conf->device_lock); |
72626685 | 3882 | bitmap_unplug(mddev->bitmap); |
700e432d | 3883 | spin_lock_irq(&conf->device_lock); |
72626685 N |
3884 | conf->seq_write = seq; |
3885 | activate_bit_delay(conf); | |
3886 | } | |
3887 | ||
1da177e4 LT |
3888 | if (list_empty(&conf->handle_list) && |
3889 | atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD && | |
3890 | !blk_queue_plugged(mddev->queue) && | |
3891 | !list_empty(&conf->delayed_list)) | |
3892 | raid5_activate_delayed(conf); | |
3893 | ||
46031f9a RBJ |
3894 | while ((bio = remove_bio_from_retry(conf))) { |
3895 | int ok; | |
3896 | spin_unlock_irq(&conf->device_lock); | |
3897 | ok = retry_aligned_read(conf, bio); | |
3898 | spin_lock_irq(&conf->device_lock); | |
3899 | if (!ok) | |
3900 | break; | |
3901 | handled++; | |
3902 | } | |
3903 | ||
d84e0f10 DW |
3904 | if (list_empty(&conf->handle_list)) { |
3905 | async_tx_issue_pending_all(); | |
1da177e4 | 3906 | break; |
d84e0f10 | 3907 | } |
1da177e4 LT |
3908 | |
3909 | first = conf->handle_list.next; | |
3910 | sh = list_entry(first, struct stripe_head, lru); | |
3911 | ||
3912 | list_del_init(first); | |
3913 | atomic_inc(&sh->count); | |
78bafebd | 3914 | BUG_ON(atomic_read(&sh->count)!= 1); |
1da177e4 LT |
3915 | spin_unlock_irq(&conf->device_lock); |
3916 | ||
3917 | handled++; | |
16a53ecc | 3918 | handle_stripe(sh, conf->spare_page); |
1da177e4 LT |
3919 | release_stripe(sh); |
3920 | ||
3921 | spin_lock_irq(&conf->device_lock); | |
3922 | } | |
45b4233c | 3923 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
3924 | |
3925 | spin_unlock_irq(&conf->device_lock); | |
3926 | ||
3927 | unplug_slaves(mddev); | |
3928 | ||
45b4233c | 3929 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
3930 | } |
3931 | ||
3f294f4f | 3932 | static ssize_t |
007583c9 | 3933 | raid5_show_stripe_cache_size(mddev_t *mddev, char *page) |
3f294f4f | 3934 | { |
007583c9 | 3935 | raid5_conf_t *conf = mddev_to_conf(mddev); |
96de1e66 N |
3936 | if (conf) |
3937 | return sprintf(page, "%d\n", conf->max_nr_stripes); | |
3938 | else | |
3939 | return 0; | |
3f294f4f N |
3940 | } |
3941 | ||
3942 | static ssize_t | |
007583c9 | 3943 | raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len) |
3f294f4f | 3944 | { |
007583c9 | 3945 | raid5_conf_t *conf = mddev_to_conf(mddev); |
3f294f4f N |
3946 | char *end; |
3947 | int new; | |
3948 | if (len >= PAGE_SIZE) | |
3949 | return -EINVAL; | |
96de1e66 N |
3950 | if (!conf) |
3951 | return -ENODEV; | |
3f294f4f N |
3952 | |
3953 | new = simple_strtoul(page, &end, 10); | |
3954 | if (!*page || (*end && *end != '\n') ) | |
3955 | return -EINVAL; | |
3956 | if (new <= 16 || new > 32768) | |
3957 | return -EINVAL; | |
3958 | while (new < conf->max_nr_stripes) { | |
3959 | if (drop_one_stripe(conf)) | |
3960 | conf->max_nr_stripes--; | |
3961 | else | |
3962 | break; | |
3963 | } | |
2a2275d6 | 3964 | md_allow_write(mddev); |
3f294f4f N |
3965 | while (new > conf->max_nr_stripes) { |
3966 | if (grow_one_stripe(conf)) | |
3967 | conf->max_nr_stripes++; | |
3968 | else break; | |
3969 | } | |
3970 | return len; | |
3971 | } | |
007583c9 | 3972 | |
96de1e66 N |
3973 | static struct md_sysfs_entry |
3974 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
3975 | raid5_show_stripe_cache_size, | |
3976 | raid5_store_stripe_cache_size); | |
3f294f4f N |
3977 | |
3978 | static ssize_t | |
96de1e66 | 3979 | stripe_cache_active_show(mddev_t *mddev, char *page) |
3f294f4f | 3980 | { |
007583c9 | 3981 | raid5_conf_t *conf = mddev_to_conf(mddev); |
96de1e66 N |
3982 | if (conf) |
3983 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
3984 | else | |
3985 | return 0; | |
3f294f4f N |
3986 | } |
3987 | ||
96de1e66 N |
3988 | static struct md_sysfs_entry |
3989 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 3990 | |
007583c9 | 3991 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
3992 | &raid5_stripecache_size.attr, |
3993 | &raid5_stripecache_active.attr, | |
3994 | NULL, | |
3995 | }; | |
007583c9 N |
3996 | static struct attribute_group raid5_attrs_group = { |
3997 | .name = NULL, | |
3998 | .attrs = raid5_attrs, | |
3f294f4f N |
3999 | }; |
4000 | ||
72626685 | 4001 | static int run(mddev_t *mddev) |
1da177e4 LT |
4002 | { |
4003 | raid5_conf_t *conf; | |
4004 | int raid_disk, memory; | |
4005 | mdk_rdev_t *rdev; | |
4006 | struct disk_info *disk; | |
4007 | struct list_head *tmp; | |
02c2de8c | 4008 | int working_disks = 0; |
1da177e4 | 4009 | |
16a53ecc N |
4010 | if (mddev->level != 5 && mddev->level != 4 && mddev->level != 6) { |
4011 | printk(KERN_ERR "raid5: %s: raid level not set to 4/5/6 (%d)\n", | |
14f8d26b | 4012 | mdname(mddev), mddev->level); |
1da177e4 LT |
4013 | return -EIO; |
4014 | } | |
4015 | ||
f6705578 N |
4016 | if (mddev->reshape_position != MaxSector) { |
4017 | /* Check that we can continue the reshape. | |
4018 | * Currently only disks can change, it must | |
4019 | * increase, and we must be past the point where | |
4020 | * a stripe over-writes itself | |
4021 | */ | |
4022 | sector_t here_new, here_old; | |
4023 | int old_disks; | |
f416885e | 4024 | int max_degraded = (mddev->level == 5 ? 1 : 2); |
f6705578 N |
4025 | |
4026 | if (mddev->new_level != mddev->level || | |
4027 | mddev->new_layout != mddev->layout || | |
4028 | mddev->new_chunk != mddev->chunk_size) { | |
f416885e N |
4029 | printk(KERN_ERR "raid5: %s: unsupported reshape " |
4030 | "required - aborting.\n", | |
f6705578 N |
4031 | mdname(mddev)); |
4032 | return -EINVAL; | |
4033 | } | |
4034 | if (mddev->delta_disks <= 0) { | |
f416885e N |
4035 | printk(KERN_ERR "raid5: %s: unsupported reshape " |
4036 | "(reduce disks) required - aborting.\n", | |
f6705578 N |
4037 | mdname(mddev)); |
4038 | return -EINVAL; | |
4039 | } | |
4040 | old_disks = mddev->raid_disks - mddev->delta_disks; | |
4041 | /* reshape_position must be on a new-stripe boundary, and one | |
f416885e N |
4042 | * further up in new geometry must map after here in old |
4043 | * geometry. | |
f6705578 N |
4044 | */ |
4045 | here_new = mddev->reshape_position; | |
f416885e N |
4046 | if (sector_div(here_new, (mddev->chunk_size>>9)* |
4047 | (mddev->raid_disks - max_degraded))) { | |
4048 | printk(KERN_ERR "raid5: reshape_position not " | |
4049 | "on a stripe boundary\n"); | |
f6705578 N |
4050 | return -EINVAL; |
4051 | } | |
4052 | /* here_new is the stripe we will write to */ | |
4053 | here_old = mddev->reshape_position; | |
f416885e N |
4054 | sector_div(here_old, (mddev->chunk_size>>9)* |
4055 | (old_disks-max_degraded)); | |
4056 | /* here_old is the first stripe that we might need to read | |
4057 | * from */ | |
f6705578 N |
4058 | if (here_new >= here_old) { |
4059 | /* Reading from the same stripe as writing to - bad */ | |
f416885e N |
4060 | printk(KERN_ERR "raid5: reshape_position too early for " |
4061 | "auto-recovery - aborting.\n"); | |
f6705578 N |
4062 | return -EINVAL; |
4063 | } | |
4064 | printk(KERN_INFO "raid5: reshape will continue\n"); | |
4065 | /* OK, we should be able to continue; */ | |
4066 | } | |
4067 | ||
4068 | ||
b55e6bfc | 4069 | mddev->private = kzalloc(sizeof (raid5_conf_t), GFP_KERNEL); |
1da177e4 LT |
4070 | if ((conf = mddev->private) == NULL) |
4071 | goto abort; | |
f6705578 N |
4072 | if (mddev->reshape_position == MaxSector) { |
4073 | conf->previous_raid_disks = conf->raid_disks = mddev->raid_disks; | |
4074 | } else { | |
4075 | conf->raid_disks = mddev->raid_disks; | |
4076 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; | |
4077 | } | |
4078 | ||
4079 | conf->disks = kzalloc(conf->raid_disks * sizeof(struct disk_info), | |
b55e6bfc N |
4080 | GFP_KERNEL); |
4081 | if (!conf->disks) | |
4082 | goto abort; | |
9ffae0cf | 4083 | |
1da177e4 LT |
4084 | conf->mddev = mddev; |
4085 | ||
fccddba0 | 4086 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 4087 | goto abort; |
1da177e4 | 4088 | |
16a53ecc N |
4089 | if (mddev->level == 6) { |
4090 | conf->spare_page = alloc_page(GFP_KERNEL); | |
4091 | if (!conf->spare_page) | |
4092 | goto abort; | |
4093 | } | |
1da177e4 LT |
4094 | spin_lock_init(&conf->device_lock); |
4095 | init_waitqueue_head(&conf->wait_for_stripe); | |
4096 | init_waitqueue_head(&conf->wait_for_overlap); | |
4097 | INIT_LIST_HEAD(&conf->handle_list); | |
4098 | INIT_LIST_HEAD(&conf->delayed_list); | |
72626685 | 4099 | INIT_LIST_HEAD(&conf->bitmap_list); |
1da177e4 LT |
4100 | INIT_LIST_HEAD(&conf->inactive_list); |
4101 | atomic_set(&conf->active_stripes, 0); | |
4102 | atomic_set(&conf->preread_active_stripes, 0); | |
46031f9a | 4103 | atomic_set(&conf->active_aligned_reads, 0); |
1da177e4 | 4104 | |
45b4233c | 4105 | pr_debug("raid5: run(%s) called.\n", mdname(mddev)); |
1da177e4 LT |
4106 | |
4107 | ITERATE_RDEV(mddev,rdev,tmp) { | |
4108 | raid_disk = rdev->raid_disk; | |
f6705578 | 4109 | if (raid_disk >= conf->raid_disks |
1da177e4 LT |
4110 | || raid_disk < 0) |
4111 | continue; | |
4112 | disk = conf->disks + raid_disk; | |
4113 | ||
4114 | disk->rdev = rdev; | |
4115 | ||
b2d444d7 | 4116 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4117 | char b[BDEVNAME_SIZE]; |
4118 | printk(KERN_INFO "raid5: device %s operational as raid" | |
4119 | " disk %d\n", bdevname(rdev->bdev,b), | |
4120 | raid_disk); | |
02c2de8c | 4121 | working_disks++; |
1da177e4 LT |
4122 | } |
4123 | } | |
4124 | ||
1da177e4 | 4125 | /* |
16a53ecc | 4126 | * 0 for a fully functional array, 1 or 2 for a degraded array. |
1da177e4 | 4127 | */ |
02c2de8c | 4128 | mddev->degraded = conf->raid_disks - working_disks; |
1da177e4 LT |
4129 | conf->mddev = mddev; |
4130 | conf->chunk_size = mddev->chunk_size; | |
4131 | conf->level = mddev->level; | |
16a53ecc N |
4132 | if (conf->level == 6) |
4133 | conf->max_degraded = 2; | |
4134 | else | |
4135 | conf->max_degraded = 1; | |
1da177e4 LT |
4136 | conf->algorithm = mddev->layout; |
4137 | conf->max_nr_stripes = NR_STRIPES; | |
f6705578 | 4138 | conf->expand_progress = mddev->reshape_position; |
1da177e4 LT |
4139 | |
4140 | /* device size must be a multiple of chunk size */ | |
4141 | mddev->size &= ~(mddev->chunk_size/1024 -1); | |
b1581566 | 4142 | mddev->resync_max_sectors = mddev->size << 1; |
1da177e4 | 4143 | |
16a53ecc N |
4144 | if (conf->level == 6 && conf->raid_disks < 4) { |
4145 | printk(KERN_ERR "raid6: not enough configured devices for %s (%d, minimum 4)\n", | |
4146 | mdname(mddev), conf->raid_disks); | |
4147 | goto abort; | |
4148 | } | |
1da177e4 LT |
4149 | if (!conf->chunk_size || conf->chunk_size % 4) { |
4150 | printk(KERN_ERR "raid5: invalid chunk size %d for %s\n", | |
4151 | conf->chunk_size, mdname(mddev)); | |
4152 | goto abort; | |
4153 | } | |
4154 | if (conf->algorithm > ALGORITHM_RIGHT_SYMMETRIC) { | |
4155 | printk(KERN_ERR | |
4156 | "raid5: unsupported parity algorithm %d for %s\n", | |
4157 | conf->algorithm, mdname(mddev)); | |
4158 | goto abort; | |
4159 | } | |
16a53ecc | 4160 | if (mddev->degraded > conf->max_degraded) { |
1da177e4 LT |
4161 | printk(KERN_ERR "raid5: not enough operational devices for %s" |
4162 | " (%d/%d failed)\n", | |
02c2de8c | 4163 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
4164 | goto abort; |
4165 | } | |
4166 | ||
16a53ecc | 4167 | if (mddev->degraded > 0 && |
1da177e4 | 4168 | mddev->recovery_cp != MaxSector) { |
6ff8d8ec N |
4169 | if (mddev->ok_start_degraded) |
4170 | printk(KERN_WARNING | |
4171 | "raid5: starting dirty degraded array: %s" | |
4172 | "- data corruption possible.\n", | |
4173 | mdname(mddev)); | |
4174 | else { | |
4175 | printk(KERN_ERR | |
4176 | "raid5: cannot start dirty degraded array for %s\n", | |
4177 | mdname(mddev)); | |
4178 | goto abort; | |
4179 | } | |
1da177e4 LT |
4180 | } |
4181 | ||
4182 | { | |
4183 | mddev->thread = md_register_thread(raid5d, mddev, "%s_raid5"); | |
4184 | if (!mddev->thread) { | |
4185 | printk(KERN_ERR | |
4186 | "raid5: couldn't allocate thread for %s\n", | |
4187 | mdname(mddev)); | |
4188 | goto abort; | |
4189 | } | |
4190 | } | |
5036805b | 4191 | memory = conf->max_nr_stripes * (sizeof(struct stripe_head) + |
1da177e4 LT |
4192 | conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
4193 | if (grow_stripes(conf, conf->max_nr_stripes)) { | |
4194 | printk(KERN_ERR | |
4195 | "raid5: couldn't allocate %dkB for buffers\n", memory); | |
4196 | shrink_stripes(conf); | |
4197 | md_unregister_thread(mddev->thread); | |
4198 | goto abort; | |
4199 | } else | |
4200 | printk(KERN_INFO "raid5: allocated %dkB for %s\n", | |
4201 | memory, mdname(mddev)); | |
4202 | ||
4203 | if (mddev->degraded == 0) | |
4204 | printk("raid5: raid level %d set %s active with %d out of %d" | |
4205 | " devices, algorithm %d\n", conf->level, mdname(mddev), | |
4206 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, | |
4207 | conf->algorithm); | |
4208 | else | |
4209 | printk(KERN_ALERT "raid5: raid level %d set %s active with %d" | |
4210 | " out of %d devices, algorithm %d\n", conf->level, | |
4211 | mdname(mddev), mddev->raid_disks - mddev->degraded, | |
4212 | mddev->raid_disks, conf->algorithm); | |
4213 | ||
4214 | print_raid5_conf(conf); | |
4215 | ||
f6705578 N |
4216 | if (conf->expand_progress != MaxSector) { |
4217 | printk("...ok start reshape thread\n"); | |
b578d55f | 4218 | conf->expand_lo = conf->expand_progress; |
f6705578 N |
4219 | atomic_set(&conf->reshape_stripes, 0); |
4220 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4221 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4222 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
4223 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4224 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
4225 | "%s_reshape"); | |
f6705578 N |
4226 | } |
4227 | ||
1da177e4 | 4228 | /* read-ahead size must cover two whole stripes, which is |
16a53ecc | 4229 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices |
1da177e4 LT |
4230 | */ |
4231 | { | |
16a53ecc N |
4232 | int data_disks = conf->previous_raid_disks - conf->max_degraded; |
4233 | int stripe = data_disks * | |
8932c2e0 | 4234 | (mddev->chunk_size / PAGE_SIZE); |
1da177e4 LT |
4235 | if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
4236 | mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
4237 | } | |
4238 | ||
4239 | /* Ok, everything is just fine now */ | |
5e55e2f5 N |
4240 | if (sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) |
4241 | printk(KERN_WARNING | |
4242 | "raid5: failed to create sysfs attributes for %s\n", | |
4243 | mdname(mddev)); | |
7a5febe9 N |
4244 | |
4245 | mddev->queue->unplug_fn = raid5_unplug_device; | |
f022b2fd | 4246 | mddev->queue->backing_dev_info.congested_data = mddev; |
041ae52e | 4247 | mddev->queue->backing_dev_info.congested_fn = raid5_congested; |
f022b2fd | 4248 | |
16a53ecc N |
4249 | mddev->array_size = mddev->size * (conf->previous_raid_disks - |
4250 | conf->max_degraded); | |
7a5febe9 | 4251 | |
23032a0e RBJ |
4252 | blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); |
4253 | ||
1da177e4 LT |
4254 | return 0; |
4255 | abort: | |
4256 | if (conf) { | |
4257 | print_raid5_conf(conf); | |
16a53ecc | 4258 | safe_put_page(conf->spare_page); |
b55e6bfc | 4259 | kfree(conf->disks); |
fccddba0 | 4260 | kfree(conf->stripe_hashtbl); |
1da177e4 LT |
4261 | kfree(conf); |
4262 | } | |
4263 | mddev->private = NULL; | |
4264 | printk(KERN_ALERT "raid5: failed to run raid set %s\n", mdname(mddev)); | |
4265 | return -EIO; | |
4266 | } | |
4267 | ||
4268 | ||
4269 | ||
3f294f4f | 4270 | static int stop(mddev_t *mddev) |
1da177e4 LT |
4271 | { |
4272 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
4273 | ||
4274 | md_unregister_thread(mddev->thread); | |
4275 | mddev->thread = NULL; | |
4276 | shrink_stripes(conf); | |
fccddba0 | 4277 | kfree(conf->stripe_hashtbl); |
041ae52e | 4278 | mddev->queue->backing_dev_info.congested_fn = NULL; |
1da177e4 | 4279 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ |
007583c9 | 4280 | sysfs_remove_group(&mddev->kobj, &raid5_attrs_group); |
b55e6bfc | 4281 | kfree(conf->disks); |
96de1e66 | 4282 | kfree(conf); |
1da177e4 LT |
4283 | mddev->private = NULL; |
4284 | return 0; | |
4285 | } | |
4286 | ||
45b4233c | 4287 | #ifdef DEBUG |
16a53ecc | 4288 | static void print_sh (struct seq_file *seq, struct stripe_head *sh) |
1da177e4 LT |
4289 | { |
4290 | int i; | |
4291 | ||
16a53ecc N |
4292 | seq_printf(seq, "sh %llu, pd_idx %d, state %ld.\n", |
4293 | (unsigned long long)sh->sector, sh->pd_idx, sh->state); | |
4294 | seq_printf(seq, "sh %llu, count %d.\n", | |
4295 | (unsigned long long)sh->sector, atomic_read(&sh->count)); | |
4296 | seq_printf(seq, "sh %llu, ", (unsigned long long)sh->sector); | |
7ecaa1e6 | 4297 | for (i = 0; i < sh->disks; i++) { |
16a53ecc N |
4298 | seq_printf(seq, "(cache%d: %p %ld) ", |
4299 | i, sh->dev[i].page, sh->dev[i].flags); | |
1da177e4 | 4300 | } |
16a53ecc | 4301 | seq_printf(seq, "\n"); |
1da177e4 LT |
4302 | } |
4303 | ||
16a53ecc | 4304 | static void printall (struct seq_file *seq, raid5_conf_t *conf) |
1da177e4 LT |
4305 | { |
4306 | struct stripe_head *sh; | |
fccddba0 | 4307 | struct hlist_node *hn; |
1da177e4 LT |
4308 | int i; |
4309 | ||
4310 | spin_lock_irq(&conf->device_lock); | |
4311 | for (i = 0; i < NR_HASH; i++) { | |
fccddba0 | 4312 | hlist_for_each_entry(sh, hn, &conf->stripe_hashtbl[i], hash) { |
1da177e4 LT |
4313 | if (sh->raid_conf != conf) |
4314 | continue; | |
16a53ecc | 4315 | print_sh(seq, sh); |
1da177e4 LT |
4316 | } |
4317 | } | |
4318 | spin_unlock_irq(&conf->device_lock); | |
4319 | } | |
4320 | #endif | |
4321 | ||
4322 | static void status (struct seq_file *seq, mddev_t *mddev) | |
4323 | { | |
4324 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
4325 | int i; | |
4326 | ||
4327 | seq_printf (seq, " level %d, %dk chunk, algorithm %d", mddev->level, mddev->chunk_size >> 10, mddev->layout); | |
02c2de8c | 4328 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
1da177e4 LT |
4329 | for (i = 0; i < conf->raid_disks; i++) |
4330 | seq_printf (seq, "%s", | |
4331 | conf->disks[i].rdev && | |
b2d444d7 | 4332 | test_bit(In_sync, &conf->disks[i].rdev->flags) ? "U" : "_"); |
1da177e4 | 4333 | seq_printf (seq, "]"); |
45b4233c | 4334 | #ifdef DEBUG |
16a53ecc N |
4335 | seq_printf (seq, "\n"); |
4336 | printall(seq, conf); | |
1da177e4 LT |
4337 | #endif |
4338 | } | |
4339 | ||
4340 | static void print_raid5_conf (raid5_conf_t *conf) | |
4341 | { | |
4342 | int i; | |
4343 | struct disk_info *tmp; | |
4344 | ||
4345 | printk("RAID5 conf printout:\n"); | |
4346 | if (!conf) { | |
4347 | printk("(conf==NULL)\n"); | |
4348 | return; | |
4349 | } | |
02c2de8c N |
4350 | printk(" --- rd:%d wd:%d\n", conf->raid_disks, |
4351 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
4352 | |
4353 | for (i = 0; i < conf->raid_disks; i++) { | |
4354 | char b[BDEVNAME_SIZE]; | |
4355 | tmp = conf->disks + i; | |
4356 | if (tmp->rdev) | |
4357 | printk(" disk %d, o:%d, dev:%s\n", | |
b2d444d7 | 4358 | i, !test_bit(Faulty, &tmp->rdev->flags), |
1da177e4 LT |
4359 | bdevname(tmp->rdev->bdev,b)); |
4360 | } | |
4361 | } | |
4362 | ||
4363 | static int raid5_spare_active(mddev_t *mddev) | |
4364 | { | |
4365 | int i; | |
4366 | raid5_conf_t *conf = mddev->private; | |
4367 | struct disk_info *tmp; | |
4368 | ||
4369 | for (i = 0; i < conf->raid_disks; i++) { | |
4370 | tmp = conf->disks + i; | |
4371 | if (tmp->rdev | |
b2d444d7 | 4372 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa N |
4373 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
4374 | unsigned long flags; | |
4375 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 4376 | mddev->degraded--; |
c04be0aa | 4377 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
4378 | } |
4379 | } | |
4380 | print_raid5_conf(conf); | |
4381 | return 0; | |
4382 | } | |
4383 | ||
4384 | static int raid5_remove_disk(mddev_t *mddev, int number) | |
4385 | { | |
4386 | raid5_conf_t *conf = mddev->private; | |
4387 | int err = 0; | |
4388 | mdk_rdev_t *rdev; | |
4389 | struct disk_info *p = conf->disks + number; | |
4390 | ||
4391 | print_raid5_conf(conf); | |
4392 | rdev = p->rdev; | |
4393 | if (rdev) { | |
b2d444d7 | 4394 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
4395 | atomic_read(&rdev->nr_pending)) { |
4396 | err = -EBUSY; | |
4397 | goto abort; | |
4398 | } | |
4399 | p->rdev = NULL; | |
fbd568a3 | 4400 | synchronize_rcu(); |
1da177e4 LT |
4401 | if (atomic_read(&rdev->nr_pending)) { |
4402 | /* lost the race, try later */ | |
4403 | err = -EBUSY; | |
4404 | p->rdev = rdev; | |
4405 | } | |
4406 | } | |
4407 | abort: | |
4408 | ||
4409 | print_raid5_conf(conf); | |
4410 | return err; | |
4411 | } | |
4412 | ||
4413 | static int raid5_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
4414 | { | |
4415 | raid5_conf_t *conf = mddev->private; | |
4416 | int found = 0; | |
4417 | int disk; | |
4418 | struct disk_info *p; | |
4419 | ||
16a53ecc | 4420 | if (mddev->degraded > conf->max_degraded) |
1da177e4 LT |
4421 | /* no point adding a device */ |
4422 | return 0; | |
4423 | ||
4424 | /* | |
16a53ecc N |
4425 | * find the disk ... but prefer rdev->saved_raid_disk |
4426 | * if possible. | |
1da177e4 | 4427 | */ |
16a53ecc N |
4428 | if (rdev->saved_raid_disk >= 0 && |
4429 | conf->disks[rdev->saved_raid_disk].rdev == NULL) | |
4430 | disk = rdev->saved_raid_disk; | |
4431 | else | |
4432 | disk = 0; | |
4433 | for ( ; disk < conf->raid_disks; disk++) | |
1da177e4 | 4434 | if ((p=conf->disks + disk)->rdev == NULL) { |
b2d444d7 | 4435 | clear_bit(In_sync, &rdev->flags); |
1da177e4 LT |
4436 | rdev->raid_disk = disk; |
4437 | found = 1; | |
72626685 N |
4438 | if (rdev->saved_raid_disk != disk) |
4439 | conf->fullsync = 1; | |
d6065f7b | 4440 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
4441 | break; |
4442 | } | |
4443 | print_raid5_conf(conf); | |
4444 | return found; | |
4445 | } | |
4446 | ||
4447 | static int raid5_resize(mddev_t *mddev, sector_t sectors) | |
4448 | { | |
4449 | /* no resync is happening, and there is enough space | |
4450 | * on all devices, so we can resize. | |
4451 | * We need to make sure resync covers any new space. | |
4452 | * If the array is shrinking we should possibly wait until | |
4453 | * any io in the removed space completes, but it hardly seems | |
4454 | * worth it. | |
4455 | */ | |
16a53ecc N |
4456 | raid5_conf_t *conf = mddev_to_conf(mddev); |
4457 | ||
1da177e4 | 4458 | sectors &= ~((sector_t)mddev->chunk_size/512 - 1); |
16a53ecc | 4459 | mddev->array_size = (sectors * (mddev->raid_disks-conf->max_degraded))>>1; |
1da177e4 | 4460 | set_capacity(mddev->gendisk, mddev->array_size << 1); |
44ce6294 | 4461 | mddev->changed = 1; |
1da177e4 LT |
4462 | if (sectors/2 > mddev->size && mddev->recovery_cp == MaxSector) { |
4463 | mddev->recovery_cp = mddev->size << 1; | |
4464 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4465 | } | |
4466 | mddev->size = sectors /2; | |
4b5c7ae8 | 4467 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
4468 | return 0; |
4469 | } | |
4470 | ||
29269553 | 4471 | #ifdef CONFIG_MD_RAID5_RESHAPE |
63c70c4f | 4472 | static int raid5_check_reshape(mddev_t *mddev) |
29269553 N |
4473 | { |
4474 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4475 | int err; | |
29269553 | 4476 | |
63c70c4f N |
4477 | if (mddev->delta_disks < 0 || |
4478 | mddev->new_level != mddev->level) | |
4479 | return -EINVAL; /* Cannot shrink array or change level yet */ | |
4480 | if (mddev->delta_disks == 0) | |
29269553 N |
4481 | return 0; /* nothing to do */ |
4482 | ||
4483 | /* Can only proceed if there are plenty of stripe_heads. | |
4484 | * We need a minimum of one full stripe,, and for sensible progress | |
4485 | * it is best to have about 4 times that. | |
4486 | * If we require 4 times, then the default 256 4K stripe_heads will | |
4487 | * allow for chunk sizes up to 256K, which is probably OK. | |
4488 | * If the chunk size is greater, user-space should request more | |
4489 | * stripe_heads first. | |
4490 | */ | |
63c70c4f N |
4491 | if ((mddev->chunk_size / STRIPE_SIZE) * 4 > conf->max_nr_stripes || |
4492 | (mddev->new_chunk / STRIPE_SIZE) * 4 > conf->max_nr_stripes) { | |
29269553 N |
4493 | printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n", |
4494 | (mddev->chunk_size / STRIPE_SIZE)*4); | |
4495 | return -ENOSPC; | |
4496 | } | |
4497 | ||
63c70c4f N |
4498 | err = resize_stripes(conf, conf->raid_disks + mddev->delta_disks); |
4499 | if (err) | |
4500 | return err; | |
4501 | ||
b4c4c7b8 N |
4502 | if (mddev->degraded > conf->max_degraded) |
4503 | return -EINVAL; | |
63c70c4f N |
4504 | /* looks like we might be able to manage this */ |
4505 | return 0; | |
4506 | } | |
4507 | ||
4508 | static int raid5_start_reshape(mddev_t *mddev) | |
4509 | { | |
4510 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4511 | mdk_rdev_t *rdev; | |
4512 | struct list_head *rtmp; | |
4513 | int spares = 0; | |
4514 | int added_devices = 0; | |
c04be0aa | 4515 | unsigned long flags; |
63c70c4f | 4516 | |
f416885e | 4517 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
4518 | return -EBUSY; |
4519 | ||
29269553 N |
4520 | ITERATE_RDEV(mddev, rdev, rtmp) |
4521 | if (rdev->raid_disk < 0 && | |
4522 | !test_bit(Faulty, &rdev->flags)) | |
4523 | spares++; | |
63c70c4f | 4524 | |
f416885e | 4525 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
4526 | /* Not enough devices even to make a degraded array |
4527 | * of that size | |
4528 | */ | |
4529 | return -EINVAL; | |
4530 | ||
f6705578 | 4531 | atomic_set(&conf->reshape_stripes, 0); |
29269553 N |
4532 | spin_lock_irq(&conf->device_lock); |
4533 | conf->previous_raid_disks = conf->raid_disks; | |
63c70c4f | 4534 | conf->raid_disks += mddev->delta_disks; |
29269553 | 4535 | conf->expand_progress = 0; |
b578d55f | 4536 | conf->expand_lo = 0; |
29269553 N |
4537 | spin_unlock_irq(&conf->device_lock); |
4538 | ||
4539 | /* Add some new drives, as many as will fit. | |
4540 | * We know there are enough to make the newly sized array work. | |
4541 | */ | |
4542 | ITERATE_RDEV(mddev, rdev, rtmp) | |
4543 | if (rdev->raid_disk < 0 && | |
4544 | !test_bit(Faulty, &rdev->flags)) { | |
4545 | if (raid5_add_disk(mddev, rdev)) { | |
4546 | char nm[20]; | |
4547 | set_bit(In_sync, &rdev->flags); | |
29269553 | 4548 | added_devices++; |
5fd6c1dc | 4549 | rdev->recovery_offset = 0; |
29269553 | 4550 | sprintf(nm, "rd%d", rdev->raid_disk); |
5e55e2f5 N |
4551 | if (sysfs_create_link(&mddev->kobj, |
4552 | &rdev->kobj, nm)) | |
4553 | printk(KERN_WARNING | |
4554 | "raid5: failed to create " | |
4555 | " link %s for %s\n", | |
4556 | nm, mdname(mddev)); | |
29269553 N |
4557 | } else |
4558 | break; | |
4559 | } | |
4560 | ||
c04be0aa | 4561 | spin_lock_irqsave(&conf->device_lock, flags); |
63c70c4f | 4562 | mddev->degraded = (conf->raid_disks - conf->previous_raid_disks) - added_devices; |
c04be0aa | 4563 | spin_unlock_irqrestore(&conf->device_lock, flags); |
63c70c4f | 4564 | mddev->raid_disks = conf->raid_disks; |
f6705578 | 4565 | mddev->reshape_position = 0; |
850b2b42 | 4566 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
f6705578 | 4567 | |
29269553 N |
4568 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
4569 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4570 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
4571 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4572 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
4573 | "%s_reshape"); | |
4574 | if (!mddev->sync_thread) { | |
4575 | mddev->recovery = 0; | |
4576 | spin_lock_irq(&conf->device_lock); | |
4577 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; | |
4578 | conf->expand_progress = MaxSector; | |
4579 | spin_unlock_irq(&conf->device_lock); | |
4580 | return -EAGAIN; | |
4581 | } | |
4582 | md_wakeup_thread(mddev->sync_thread); | |
4583 | md_new_event(mddev); | |
4584 | return 0; | |
4585 | } | |
4586 | #endif | |
4587 | ||
4588 | static void end_reshape(raid5_conf_t *conf) | |
4589 | { | |
4590 | struct block_device *bdev; | |
4591 | ||
f6705578 | 4592 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
f416885e N |
4593 | conf->mddev->array_size = conf->mddev->size * |
4594 | (conf->raid_disks - conf->max_degraded); | |
f6705578 | 4595 | set_capacity(conf->mddev->gendisk, conf->mddev->array_size << 1); |
44ce6294 | 4596 | conf->mddev->changed = 1; |
f6705578 N |
4597 | |
4598 | bdev = bdget_disk(conf->mddev->gendisk, 0); | |
4599 | if (bdev) { | |
4600 | mutex_lock(&bdev->bd_inode->i_mutex); | |
0692c6b1 | 4601 | i_size_write(bdev->bd_inode, (loff_t)conf->mddev->array_size << 10); |
f6705578 N |
4602 | mutex_unlock(&bdev->bd_inode->i_mutex); |
4603 | bdput(bdev); | |
4604 | } | |
4605 | spin_lock_irq(&conf->device_lock); | |
4606 | conf->expand_progress = MaxSector; | |
4607 | spin_unlock_irq(&conf->device_lock); | |
4608 | conf->mddev->reshape_position = MaxSector; | |
16a53ecc N |
4609 | |
4610 | /* read-ahead size must cover two whole stripes, which is | |
4611 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
4612 | */ | |
4613 | { | |
4614 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
4615 | int stripe = data_disks * | |
4616 | (conf->mddev->chunk_size / PAGE_SIZE); | |
4617 | if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) | |
4618 | conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
4619 | } | |
29269553 | 4620 | } |
29269553 N |
4621 | } |
4622 | ||
72626685 N |
4623 | static void raid5_quiesce(mddev_t *mddev, int state) |
4624 | { | |
4625 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4626 | ||
4627 | switch(state) { | |
e464eafd N |
4628 | case 2: /* resume for a suspend */ |
4629 | wake_up(&conf->wait_for_overlap); | |
4630 | break; | |
4631 | ||
72626685 N |
4632 | case 1: /* stop all writes */ |
4633 | spin_lock_irq(&conf->device_lock); | |
4634 | conf->quiesce = 1; | |
4635 | wait_event_lock_irq(conf->wait_for_stripe, | |
46031f9a RBJ |
4636 | atomic_read(&conf->active_stripes) == 0 && |
4637 | atomic_read(&conf->active_aligned_reads) == 0, | |
72626685 N |
4638 | conf->device_lock, /* nothing */); |
4639 | spin_unlock_irq(&conf->device_lock); | |
4640 | break; | |
4641 | ||
4642 | case 0: /* re-enable writes */ | |
4643 | spin_lock_irq(&conf->device_lock); | |
4644 | conf->quiesce = 0; | |
4645 | wake_up(&conf->wait_for_stripe); | |
e464eafd | 4646 | wake_up(&conf->wait_for_overlap); |
72626685 N |
4647 | spin_unlock_irq(&conf->device_lock); |
4648 | break; | |
4649 | } | |
72626685 | 4650 | } |
b15c2e57 | 4651 | |
16a53ecc N |
4652 | static struct mdk_personality raid6_personality = |
4653 | { | |
4654 | .name = "raid6", | |
4655 | .level = 6, | |
4656 | .owner = THIS_MODULE, | |
4657 | .make_request = make_request, | |
4658 | .run = run, | |
4659 | .stop = stop, | |
4660 | .status = status, | |
4661 | .error_handler = error, | |
4662 | .hot_add_disk = raid5_add_disk, | |
4663 | .hot_remove_disk= raid5_remove_disk, | |
4664 | .spare_active = raid5_spare_active, | |
4665 | .sync_request = sync_request, | |
4666 | .resize = raid5_resize, | |
f416885e N |
4667 | #ifdef CONFIG_MD_RAID5_RESHAPE |
4668 | .check_reshape = raid5_check_reshape, | |
4669 | .start_reshape = raid5_start_reshape, | |
4670 | #endif | |
16a53ecc N |
4671 | .quiesce = raid5_quiesce, |
4672 | }; | |
2604b703 | 4673 | static struct mdk_personality raid5_personality = |
1da177e4 LT |
4674 | { |
4675 | .name = "raid5", | |
2604b703 | 4676 | .level = 5, |
1da177e4 LT |
4677 | .owner = THIS_MODULE, |
4678 | .make_request = make_request, | |
4679 | .run = run, | |
4680 | .stop = stop, | |
4681 | .status = status, | |
4682 | .error_handler = error, | |
4683 | .hot_add_disk = raid5_add_disk, | |
4684 | .hot_remove_disk= raid5_remove_disk, | |
4685 | .spare_active = raid5_spare_active, | |
4686 | .sync_request = sync_request, | |
4687 | .resize = raid5_resize, | |
29269553 | 4688 | #ifdef CONFIG_MD_RAID5_RESHAPE |
63c70c4f N |
4689 | .check_reshape = raid5_check_reshape, |
4690 | .start_reshape = raid5_start_reshape, | |
29269553 | 4691 | #endif |
72626685 | 4692 | .quiesce = raid5_quiesce, |
1da177e4 LT |
4693 | }; |
4694 | ||
2604b703 | 4695 | static struct mdk_personality raid4_personality = |
1da177e4 | 4696 | { |
2604b703 N |
4697 | .name = "raid4", |
4698 | .level = 4, | |
4699 | .owner = THIS_MODULE, | |
4700 | .make_request = make_request, | |
4701 | .run = run, | |
4702 | .stop = stop, | |
4703 | .status = status, | |
4704 | .error_handler = error, | |
4705 | .hot_add_disk = raid5_add_disk, | |
4706 | .hot_remove_disk= raid5_remove_disk, | |
4707 | .spare_active = raid5_spare_active, | |
4708 | .sync_request = sync_request, | |
4709 | .resize = raid5_resize, | |
3d37890b N |
4710 | #ifdef CONFIG_MD_RAID5_RESHAPE |
4711 | .check_reshape = raid5_check_reshape, | |
4712 | .start_reshape = raid5_start_reshape, | |
4713 | #endif | |
2604b703 N |
4714 | .quiesce = raid5_quiesce, |
4715 | }; | |
4716 | ||
4717 | static int __init raid5_init(void) | |
4718 | { | |
16a53ecc N |
4719 | int e; |
4720 | ||
4721 | e = raid6_select_algo(); | |
4722 | if ( e ) | |
4723 | return e; | |
4724 | register_md_personality(&raid6_personality); | |
2604b703 N |
4725 | register_md_personality(&raid5_personality); |
4726 | register_md_personality(&raid4_personality); | |
4727 | return 0; | |
1da177e4 LT |
4728 | } |
4729 | ||
2604b703 | 4730 | static void raid5_exit(void) |
1da177e4 | 4731 | { |
16a53ecc | 4732 | unregister_md_personality(&raid6_personality); |
2604b703 N |
4733 | unregister_md_personality(&raid5_personality); |
4734 | unregister_md_personality(&raid4_personality); | |
1da177e4 LT |
4735 | } |
4736 | ||
4737 | module_init(raid5_init); | |
4738 | module_exit(raid5_exit); | |
4739 | MODULE_LICENSE("GPL"); | |
4740 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ | |
d9d166c2 N |
4741 | MODULE_ALIAS("md-raid5"); |
4742 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
4743 | MODULE_ALIAS("md-level-5"); |
4744 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
4745 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
4746 | MODULE_ALIAS("md-raid6"); | |
4747 | MODULE_ALIAS("md-level-6"); | |
4748 | ||
4749 | /* This used to be two separate modules, they were: */ | |
4750 | MODULE_ALIAS("raid5"); | |
4751 | MODULE_ALIAS("raid6"); |