Commit | Line | Data |
---|---|---|
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) { | |
111 | int bytes = bi->bi_size; | |
112 | ||
113 | return_bi = bi->bi_next; | |
114 | bi->bi_next = NULL; | |
115 | bi->bi_size = 0; | |
116 | bi->bi_end_io(bi, bytes, | |
117 | test_bit(BIO_UPTODATE, &bi->bi_flags) | |
118 | ? 0 : -EIO); | |
119 | bi = return_bi; | |
120 | } | |
121 | } | |
122 | ||
1da177e4 LT |
123 | static void print_raid5_conf (raid5_conf_t *conf); |
124 | ||
858119e1 | 125 | static void __release_stripe(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 LT |
126 | { |
127 | if (atomic_dec_and_test(&sh->count)) { | |
78bafebd ES |
128 | BUG_ON(!list_empty(&sh->lru)); |
129 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1da177e4 | 130 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
7c785b7a | 131 | if (test_bit(STRIPE_DELAYED, &sh->state)) { |
1da177e4 | 132 | list_add_tail(&sh->lru, &conf->delayed_list); |
7c785b7a N |
133 | blk_plug_device(conf->mddev->queue); |
134 | } else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && | |
ae3c20cc | 135 | sh->bm_seq - conf->seq_write > 0) { |
72626685 | 136 | list_add_tail(&sh->lru, &conf->bitmap_list); |
7c785b7a N |
137 | blk_plug_device(conf->mddev->queue); |
138 | } else { | |
72626685 | 139 | clear_bit(STRIPE_BIT_DELAY, &sh->state); |
1da177e4 | 140 | list_add_tail(&sh->lru, &conf->handle_list); |
72626685 | 141 | } |
1da177e4 LT |
142 | md_wakeup_thread(conf->mddev->thread); |
143 | } else { | |
d84e0f10 | 144 | BUG_ON(sh->ops.pending); |
1da177e4 LT |
145 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { |
146 | atomic_dec(&conf->preread_active_stripes); | |
147 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) | |
148 | md_wakeup_thread(conf->mddev->thread); | |
149 | } | |
1da177e4 | 150 | atomic_dec(&conf->active_stripes); |
ccfcc3c1 N |
151 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
152 | list_add_tail(&sh->lru, &conf->inactive_list); | |
1da177e4 | 153 | wake_up(&conf->wait_for_stripe); |
46031f9a RBJ |
154 | if (conf->retry_read_aligned) |
155 | md_wakeup_thread(conf->mddev->thread); | |
ccfcc3c1 | 156 | } |
1da177e4 LT |
157 | } |
158 | } | |
159 | } | |
160 | static void release_stripe(struct stripe_head *sh) | |
161 | { | |
162 | raid5_conf_t *conf = sh->raid_conf; | |
163 | unsigned long flags; | |
16a53ecc | 164 | |
1da177e4 LT |
165 | spin_lock_irqsave(&conf->device_lock, flags); |
166 | __release_stripe(conf, sh); | |
167 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
168 | } | |
169 | ||
fccddba0 | 170 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 171 | { |
45b4233c DW |
172 | pr_debug("remove_hash(), stripe %llu\n", |
173 | (unsigned long long)sh->sector); | |
1da177e4 | 174 | |
fccddba0 | 175 | hlist_del_init(&sh->hash); |
1da177e4 LT |
176 | } |
177 | ||
16a53ecc | 178 | static inline void insert_hash(raid5_conf_t *conf, struct stripe_head *sh) |
1da177e4 | 179 | { |
fccddba0 | 180 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 181 | |
45b4233c DW |
182 | pr_debug("insert_hash(), stripe %llu\n", |
183 | (unsigned long long)sh->sector); | |
1da177e4 LT |
184 | |
185 | CHECK_DEVLOCK(); | |
fccddba0 | 186 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
187 | } |
188 | ||
189 | ||
190 | /* find an idle stripe, make sure it is unhashed, and return it. */ | |
191 | static struct stripe_head *get_free_stripe(raid5_conf_t *conf) | |
192 | { | |
193 | struct stripe_head *sh = NULL; | |
194 | struct list_head *first; | |
195 | ||
196 | CHECK_DEVLOCK(); | |
197 | if (list_empty(&conf->inactive_list)) | |
198 | goto out; | |
199 | first = conf->inactive_list.next; | |
200 | sh = list_entry(first, struct stripe_head, lru); | |
201 | list_del_init(first); | |
202 | remove_hash(sh); | |
203 | atomic_inc(&conf->active_stripes); | |
204 | out: | |
205 | return sh; | |
206 | } | |
207 | ||
208 | static void shrink_buffers(struct stripe_head *sh, int num) | |
209 | { | |
210 | struct page *p; | |
211 | int i; | |
212 | ||
213 | for (i=0; i<num ; i++) { | |
214 | p = sh->dev[i].page; | |
215 | if (!p) | |
216 | continue; | |
217 | sh->dev[i].page = NULL; | |
2d1f3b5d | 218 | put_page(p); |
1da177e4 LT |
219 | } |
220 | } | |
221 | ||
222 | static int grow_buffers(struct stripe_head *sh, int num) | |
223 | { | |
224 | int i; | |
225 | ||
226 | for (i=0; i<num; i++) { | |
227 | struct page *page; | |
228 | ||
229 | if (!(page = alloc_page(GFP_KERNEL))) { | |
230 | return 1; | |
231 | } | |
232 | sh->dev[i].page = page; | |
233 | } | |
234 | return 0; | |
235 | } | |
236 | ||
237 | static void raid5_build_block (struct stripe_head *sh, int i); | |
238 | ||
7ecaa1e6 | 239 | static void init_stripe(struct stripe_head *sh, sector_t sector, int pd_idx, int disks) |
1da177e4 LT |
240 | { |
241 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 242 | int i; |
1da177e4 | 243 | |
78bafebd ES |
244 | BUG_ON(atomic_read(&sh->count) != 0); |
245 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
d84e0f10 DW |
246 | BUG_ON(sh->ops.pending || sh->ops.ack || sh->ops.complete); |
247 | ||
1da177e4 | 248 | CHECK_DEVLOCK(); |
45b4233c | 249 | pr_debug("init_stripe called, stripe %llu\n", |
1da177e4 LT |
250 | (unsigned long long)sh->sector); |
251 | ||
252 | remove_hash(sh); | |
16a53ecc | 253 | |
1da177e4 LT |
254 | sh->sector = sector; |
255 | sh->pd_idx = pd_idx; | |
256 | sh->state = 0; | |
257 | ||
7ecaa1e6 N |
258 | sh->disks = disks; |
259 | ||
260 | for (i = sh->disks; i--; ) { | |
1da177e4 LT |
261 | struct r5dev *dev = &sh->dev[i]; |
262 | ||
d84e0f10 | 263 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 264 | test_bit(R5_LOCKED, &dev->flags)) { |
d84e0f10 | 265 | printk(KERN_ERR "sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 266 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 267 | dev->read, dev->towrite, dev->written, |
1da177e4 LT |
268 | test_bit(R5_LOCKED, &dev->flags)); |
269 | BUG(); | |
270 | } | |
271 | dev->flags = 0; | |
272 | raid5_build_block(sh, i); | |
273 | } | |
274 | insert_hash(conf, sh); | |
275 | } | |
276 | ||
7ecaa1e6 | 277 | static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, int disks) |
1da177e4 LT |
278 | { |
279 | struct stripe_head *sh; | |
fccddba0 | 280 | struct hlist_node *hn; |
1da177e4 LT |
281 | |
282 | CHECK_DEVLOCK(); | |
45b4233c | 283 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
fccddba0 | 284 | hlist_for_each_entry(sh, hn, stripe_hash(conf, sector), hash) |
7ecaa1e6 | 285 | if (sh->sector == sector && sh->disks == disks) |
1da177e4 | 286 | return sh; |
45b4233c | 287 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
288 | return NULL; |
289 | } | |
290 | ||
291 | static void unplug_slaves(mddev_t *mddev); | |
292 | static void raid5_unplug_device(request_queue_t *q); | |
293 | ||
7ecaa1e6 N |
294 | static struct stripe_head *get_active_stripe(raid5_conf_t *conf, sector_t sector, int disks, |
295 | int pd_idx, int noblock) | |
1da177e4 LT |
296 | { |
297 | struct stripe_head *sh; | |
298 | ||
45b4233c | 299 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 LT |
300 | |
301 | spin_lock_irq(&conf->device_lock); | |
302 | ||
303 | do { | |
72626685 N |
304 | wait_event_lock_irq(conf->wait_for_stripe, |
305 | conf->quiesce == 0, | |
306 | conf->device_lock, /* nothing */); | |
7ecaa1e6 | 307 | sh = __find_stripe(conf, sector, disks); |
1da177e4 LT |
308 | if (!sh) { |
309 | if (!conf->inactive_blocked) | |
310 | sh = get_free_stripe(conf); | |
311 | if (noblock && sh == NULL) | |
312 | break; | |
313 | if (!sh) { | |
314 | conf->inactive_blocked = 1; | |
315 | wait_event_lock_irq(conf->wait_for_stripe, | |
316 | !list_empty(&conf->inactive_list) && | |
5036805b N |
317 | (atomic_read(&conf->active_stripes) |
318 | < (conf->max_nr_stripes *3/4) | |
1da177e4 LT |
319 | || !conf->inactive_blocked), |
320 | conf->device_lock, | |
f4370781 | 321 | raid5_unplug_device(conf->mddev->queue) |
1da177e4 LT |
322 | ); |
323 | conf->inactive_blocked = 0; | |
324 | } else | |
7ecaa1e6 | 325 | init_stripe(sh, sector, pd_idx, disks); |
1da177e4 LT |
326 | } else { |
327 | if (atomic_read(&sh->count)) { | |
78bafebd | 328 | BUG_ON(!list_empty(&sh->lru)); |
1da177e4 LT |
329 | } else { |
330 | if (!test_bit(STRIPE_HANDLE, &sh->state)) | |
331 | atomic_inc(&conf->active_stripes); | |
ff4e8d9a N |
332 | if (list_empty(&sh->lru) && |
333 | !test_bit(STRIPE_EXPANDING, &sh->state)) | |
16a53ecc N |
334 | BUG(); |
335 | list_del_init(&sh->lru); | |
1da177e4 LT |
336 | } |
337 | } | |
338 | } while (sh == NULL); | |
339 | ||
340 | if (sh) | |
341 | atomic_inc(&sh->count); | |
342 | ||
343 | spin_unlock_irq(&conf->device_lock); | |
344 | return sh; | |
345 | } | |
346 | ||
d84e0f10 DW |
347 | /* test_and_ack_op() ensures that we only dequeue an operation once */ |
348 | #define test_and_ack_op(op, pend) \ | |
349 | do { \ | |
350 | if (test_bit(op, &sh->ops.pending) && \ | |
351 | !test_bit(op, &sh->ops.complete)) { \ | |
352 | if (test_and_set_bit(op, &sh->ops.ack)) \ | |
353 | clear_bit(op, &pend); \ | |
354 | else \ | |
355 | ack++; \ | |
356 | } else \ | |
357 | clear_bit(op, &pend); \ | |
358 | } while (0) | |
359 | ||
360 | /* find new work to run, do not resubmit work that is already | |
361 | * in flight | |
362 | */ | |
363 | static unsigned long get_stripe_work(struct stripe_head *sh) | |
364 | { | |
365 | unsigned long pending; | |
366 | int ack = 0; | |
367 | ||
368 | pending = sh->ops.pending; | |
369 | ||
370 | test_and_ack_op(STRIPE_OP_BIOFILL, pending); | |
371 | test_and_ack_op(STRIPE_OP_COMPUTE_BLK, pending); | |
372 | test_and_ack_op(STRIPE_OP_PREXOR, pending); | |
373 | test_and_ack_op(STRIPE_OP_BIODRAIN, pending); | |
374 | test_and_ack_op(STRIPE_OP_POSTXOR, pending); | |
375 | test_and_ack_op(STRIPE_OP_CHECK, pending); | |
376 | if (test_and_clear_bit(STRIPE_OP_IO, &sh->ops.pending)) | |
377 | ack++; | |
378 | ||
379 | sh->ops.count -= ack; | |
380 | BUG_ON(sh->ops.count < 0); | |
381 | ||
382 | return pending; | |
383 | } | |
384 | ||
91c00924 DW |
385 | static int |
386 | raid5_end_read_request(struct bio *bi, unsigned int bytes_done, int error); | |
387 | static int | |
388 | raid5_end_write_request (struct bio *bi, unsigned int bytes_done, int error); | |
389 | ||
390 | static void ops_run_io(struct stripe_head *sh) | |
391 | { | |
392 | raid5_conf_t *conf = sh->raid_conf; | |
393 | int i, disks = sh->disks; | |
394 | ||
395 | might_sleep(); | |
396 | ||
397 | for (i = disks; i--; ) { | |
398 | int rw; | |
399 | struct bio *bi; | |
400 | mdk_rdev_t *rdev; | |
401 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) | |
402 | rw = WRITE; | |
403 | else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) | |
404 | rw = READ; | |
405 | else | |
406 | continue; | |
407 | ||
408 | bi = &sh->dev[i].req; | |
409 | ||
410 | bi->bi_rw = rw; | |
411 | if (rw == WRITE) | |
412 | bi->bi_end_io = raid5_end_write_request; | |
413 | else | |
414 | bi->bi_end_io = raid5_end_read_request; | |
415 | ||
416 | rcu_read_lock(); | |
417 | rdev = rcu_dereference(conf->disks[i].rdev); | |
418 | if (rdev && test_bit(Faulty, &rdev->flags)) | |
419 | rdev = NULL; | |
420 | if (rdev) | |
421 | atomic_inc(&rdev->nr_pending); | |
422 | rcu_read_unlock(); | |
423 | ||
424 | if (rdev) { | |
425 | if (test_bit(STRIPE_SYNCING, &sh->state) || | |
426 | test_bit(STRIPE_EXPAND_SOURCE, &sh->state) || | |
427 | test_bit(STRIPE_EXPAND_READY, &sh->state)) | |
428 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); | |
429 | ||
430 | bi->bi_bdev = rdev->bdev; | |
431 | pr_debug("%s: for %llu schedule op %ld on disc %d\n", | |
432 | __FUNCTION__, (unsigned long long)sh->sector, | |
433 | bi->bi_rw, i); | |
434 | atomic_inc(&sh->count); | |
435 | bi->bi_sector = sh->sector + rdev->data_offset; | |
436 | bi->bi_flags = 1 << BIO_UPTODATE; | |
437 | bi->bi_vcnt = 1; | |
438 | bi->bi_max_vecs = 1; | |
439 | bi->bi_idx = 0; | |
440 | bi->bi_io_vec = &sh->dev[i].vec; | |
441 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; | |
442 | bi->bi_io_vec[0].bv_offset = 0; | |
443 | bi->bi_size = STRIPE_SIZE; | |
444 | bi->bi_next = NULL; | |
445 | if (rw == WRITE && | |
446 | test_bit(R5_ReWrite, &sh->dev[i].flags)) | |
447 | atomic_add(STRIPE_SECTORS, | |
448 | &rdev->corrected_errors); | |
449 | generic_make_request(bi); | |
450 | } else { | |
451 | if (rw == WRITE) | |
452 | set_bit(STRIPE_DEGRADED, &sh->state); | |
453 | pr_debug("skip op %ld on disc %d for sector %llu\n", | |
454 | bi->bi_rw, i, (unsigned long long)sh->sector); | |
455 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
456 | set_bit(STRIPE_HANDLE, &sh->state); | |
457 | } | |
458 | } | |
459 | } | |
460 | ||
461 | static struct dma_async_tx_descriptor * | |
462 | async_copy_data(int frombio, struct bio *bio, struct page *page, | |
463 | sector_t sector, struct dma_async_tx_descriptor *tx) | |
464 | { | |
465 | struct bio_vec *bvl; | |
466 | struct page *bio_page; | |
467 | int i; | |
468 | int page_offset; | |
469 | ||
470 | if (bio->bi_sector >= sector) | |
471 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
472 | else | |
473 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
474 | bio_for_each_segment(bvl, bio, i) { | |
475 | int len = bio_iovec_idx(bio, i)->bv_len; | |
476 | int clen; | |
477 | int b_offset = 0; | |
478 | ||
479 | if (page_offset < 0) { | |
480 | b_offset = -page_offset; | |
481 | page_offset += b_offset; | |
482 | len -= b_offset; | |
483 | } | |
484 | ||
485 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
486 | clen = STRIPE_SIZE - page_offset; | |
487 | else | |
488 | clen = len; | |
489 | ||
490 | if (clen > 0) { | |
491 | b_offset += bio_iovec_idx(bio, i)->bv_offset; | |
492 | bio_page = bio_iovec_idx(bio, i)->bv_page; | |
493 | if (frombio) | |
494 | tx = async_memcpy(page, bio_page, page_offset, | |
495 | b_offset, clen, | |
496 | ASYNC_TX_DEP_ACK | ASYNC_TX_KMAP_SRC, | |
497 | tx, NULL, NULL); | |
498 | else | |
499 | tx = async_memcpy(bio_page, page, b_offset, | |
500 | page_offset, clen, | |
501 | ASYNC_TX_DEP_ACK | ASYNC_TX_KMAP_DST, | |
502 | tx, NULL, NULL); | |
503 | } | |
504 | if (clen < len) /* hit end of page */ | |
505 | break; | |
506 | page_offset += len; | |
507 | } | |
508 | ||
509 | return tx; | |
510 | } | |
511 | ||
512 | static void ops_complete_biofill(void *stripe_head_ref) | |
513 | { | |
514 | struct stripe_head *sh = stripe_head_ref; | |
515 | struct bio *return_bi = NULL; | |
516 | raid5_conf_t *conf = sh->raid_conf; | |
517 | int i, more_to_read = 0; | |
518 | ||
519 | pr_debug("%s: stripe %llu\n", __FUNCTION__, | |
520 | (unsigned long long)sh->sector); | |
521 | ||
522 | /* clear completed biofills */ | |
523 | for (i = sh->disks; i--; ) { | |
524 | struct r5dev *dev = &sh->dev[i]; | |
525 | /* check if this stripe has new incoming reads */ | |
526 | if (dev->toread) | |
527 | more_to_read++; | |
528 | ||
529 | /* acknowledge completion of a biofill operation */ | |
530 | /* and check if we need to reply to a read request | |
531 | */ | |
532 | if (test_bit(R5_Wantfill, &dev->flags) && !dev->toread) { | |
533 | struct bio *rbi, *rbi2; | |
534 | clear_bit(R5_Wantfill, &dev->flags); | |
535 | ||
536 | /* The access to dev->read is outside of the | |
537 | * spin_lock_irq(&conf->device_lock), but is protected | |
538 | * by the STRIPE_OP_BIOFILL pending bit | |
539 | */ | |
540 | BUG_ON(!dev->read); | |
541 | rbi = dev->read; | |
542 | dev->read = NULL; | |
543 | while (rbi && rbi->bi_sector < | |
544 | dev->sector + STRIPE_SECTORS) { | |
545 | rbi2 = r5_next_bio(rbi, dev->sector); | |
546 | spin_lock_irq(&conf->device_lock); | |
547 | if (--rbi->bi_phys_segments == 0) { | |
548 | rbi->bi_next = return_bi; | |
549 | return_bi = rbi; | |
550 | } | |
551 | spin_unlock_irq(&conf->device_lock); | |
552 | rbi = rbi2; | |
553 | } | |
554 | } | |
555 | } | |
556 | clear_bit(STRIPE_OP_BIOFILL, &sh->ops.ack); | |
557 | clear_bit(STRIPE_OP_BIOFILL, &sh->ops.pending); | |
558 | ||
559 | return_io(return_bi); | |
560 | ||
561 | if (more_to_read) | |
562 | set_bit(STRIPE_HANDLE, &sh->state); | |
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 LT |
953 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
954 | 0, 0, NULL, NULL); | |
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), | |
1006 | 0, 0, NULL, NULL); | |
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 | ||
4e5314b5 | 1116 | static int raid5_end_read_request(struct bio * bi, unsigned int bytes_done, |
1da177e4 LT |
1117 | int error) |
1118 | { | |
1119 | struct stripe_head *sh = bi->bi_private; | |
1120 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 1121 | int disks = sh->disks, i; |
1da177e4 | 1122 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
d6950432 N |
1123 | char b[BDEVNAME_SIZE]; |
1124 | mdk_rdev_t *rdev; | |
1da177e4 LT |
1125 | |
1126 | if (bi->bi_size) | |
1127 | return 1; | |
1128 | ||
1129 | for (i=0 ; i<disks; i++) | |
1130 | if (bi == &sh->dev[i].req) | |
1131 | break; | |
1132 | ||
45b4233c DW |
1133 | pr_debug("end_read_request %llu/%d, count: %d, uptodate %d.\n", |
1134 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), | |
1da177e4 LT |
1135 | uptodate); |
1136 | if (i == disks) { | |
1137 | BUG(); | |
1138 | return 0; | |
1139 | } | |
1140 | ||
1141 | if (uptodate) { | |
1da177e4 | 1142 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 1143 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
d6950432 N |
1144 | rdev = conf->disks[i].rdev; |
1145 | printk(KERN_INFO "raid5:%s: read error corrected (%lu sectors at %llu on %s)\n", | |
1146 | mdname(conf->mddev), STRIPE_SECTORS, | |
1147 | (unsigned long long)sh->sector + rdev->data_offset, | |
1148 | bdevname(rdev->bdev, b)); | |
4e5314b5 N |
1149 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1150 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
1151 | } | |
ba22dcbf N |
1152 | if (atomic_read(&conf->disks[i].rdev->read_errors)) |
1153 | atomic_set(&conf->disks[i].rdev->read_errors, 0); | |
1da177e4 | 1154 | } else { |
d6950432 | 1155 | const char *bdn = bdevname(conf->disks[i].rdev->bdev, b); |
ba22dcbf | 1156 | int retry = 0; |
d6950432 N |
1157 | rdev = conf->disks[i].rdev; |
1158 | ||
1da177e4 | 1159 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 1160 | atomic_inc(&rdev->read_errors); |
ba22dcbf | 1161 | if (conf->mddev->degraded) |
d6950432 N |
1162 | printk(KERN_WARNING "raid5:%s: read error not correctable (sector %llu on %s).\n", |
1163 | mdname(conf->mddev), | |
1164 | (unsigned long long)sh->sector + rdev->data_offset, | |
1165 | bdn); | |
ba22dcbf | 1166 | else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) |
4e5314b5 | 1167 | /* Oh, no!!! */ |
d6950432 N |
1168 | printk(KERN_WARNING "raid5:%s: read error NOT corrected!! (sector %llu on %s).\n", |
1169 | mdname(conf->mddev), | |
1170 | (unsigned long long)sh->sector + rdev->data_offset, | |
1171 | bdn); | |
1172 | else if (atomic_read(&rdev->read_errors) | |
ba22dcbf | 1173 | > conf->max_nr_stripes) |
14f8d26b | 1174 | printk(KERN_WARNING |
d6950432 N |
1175 | "raid5:%s: Too many read errors, failing device %s.\n", |
1176 | mdname(conf->mddev), bdn); | |
ba22dcbf N |
1177 | else |
1178 | retry = 1; | |
1179 | if (retry) | |
1180 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
1181 | else { | |
4e5314b5 N |
1182 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
1183 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
d6950432 | 1184 | md_error(conf->mddev, rdev); |
ba22dcbf | 1185 | } |
1da177e4 LT |
1186 | } |
1187 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1da177e4 LT |
1188 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1189 | set_bit(STRIPE_HANDLE, &sh->state); | |
1190 | release_stripe(sh); | |
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | static int raid5_end_write_request (struct bio *bi, unsigned int bytes_done, | |
1195 | int error) | |
1196 | { | |
1197 | struct stripe_head *sh = bi->bi_private; | |
1198 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 1199 | int disks = sh->disks, i; |
1da177e4 LT |
1200 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
1201 | ||
1202 | if (bi->bi_size) | |
1203 | return 1; | |
1204 | ||
1205 | for (i=0 ; i<disks; i++) | |
1206 | if (bi == &sh->dev[i].req) | |
1207 | break; | |
1208 | ||
45b4233c | 1209 | pr_debug("end_write_request %llu/%d, count %d, uptodate: %d.\n", |
1da177e4 LT |
1210 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
1211 | uptodate); | |
1212 | if (i == disks) { | |
1213 | BUG(); | |
1214 | return 0; | |
1215 | } | |
1216 | ||
1da177e4 LT |
1217 | if (!uptodate) |
1218 | md_error(conf->mddev, conf->disks[i].rdev); | |
1219 | ||
1220 | rdev_dec_pending(conf->disks[i].rdev, conf->mddev); | |
1221 | ||
1222 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1223 | set_bit(STRIPE_HANDLE, &sh->state); | |
c04be0aa | 1224 | release_stripe(sh); |
1da177e4 LT |
1225 | return 0; |
1226 | } | |
1227 | ||
1228 | ||
1229 | static sector_t compute_blocknr(struct stripe_head *sh, int i); | |
1230 | ||
1231 | static void raid5_build_block (struct stripe_head *sh, int i) | |
1232 | { | |
1233 | struct r5dev *dev = &sh->dev[i]; | |
1234 | ||
1235 | bio_init(&dev->req); | |
1236 | dev->req.bi_io_vec = &dev->vec; | |
1237 | dev->req.bi_vcnt++; | |
1238 | dev->req.bi_max_vecs++; | |
1239 | dev->vec.bv_page = dev->page; | |
1240 | dev->vec.bv_len = STRIPE_SIZE; | |
1241 | dev->vec.bv_offset = 0; | |
1242 | ||
1243 | dev->req.bi_sector = sh->sector; | |
1244 | dev->req.bi_private = sh; | |
1245 | ||
1246 | dev->flags = 0; | |
16a53ecc | 1247 | dev->sector = compute_blocknr(sh, i); |
1da177e4 LT |
1248 | } |
1249 | ||
1250 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
1251 | { | |
1252 | char b[BDEVNAME_SIZE]; | |
1253 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
45b4233c | 1254 | pr_debug("raid5: error called\n"); |
1da177e4 | 1255 | |
b2d444d7 | 1256 | if (!test_bit(Faulty, &rdev->flags)) { |
850b2b42 | 1257 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
c04be0aa N |
1258 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1259 | unsigned long flags; | |
1260 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1261 | mddev->degraded++; |
c04be0aa | 1262 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1263 | /* |
1264 | * if recovery was running, make sure it aborts. | |
1265 | */ | |
1266 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
1267 | } | |
b2d444d7 | 1268 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1269 | printk (KERN_ALERT |
1270 | "raid5: Disk failure on %s, disabling device." | |
1271 | " Operation continuing on %d devices\n", | |
02c2de8c | 1272 | bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded); |
1da177e4 | 1273 | } |
16a53ecc | 1274 | } |
1da177e4 LT |
1275 | |
1276 | /* | |
1277 | * Input: a 'big' sector number, | |
1278 | * Output: index of the data and parity disk, and the sector # in them. | |
1279 | */ | |
1280 | static sector_t raid5_compute_sector(sector_t r_sector, unsigned int raid_disks, | |
1281 | unsigned int data_disks, unsigned int * dd_idx, | |
1282 | unsigned int * pd_idx, raid5_conf_t *conf) | |
1283 | { | |
1284 | long stripe; | |
1285 | unsigned long chunk_number; | |
1286 | unsigned int chunk_offset; | |
1287 | sector_t new_sector; | |
1288 | int sectors_per_chunk = conf->chunk_size >> 9; | |
1289 | ||
1290 | /* First compute the information on this sector */ | |
1291 | ||
1292 | /* | |
1293 | * Compute the chunk number and the sector offset inside the chunk | |
1294 | */ | |
1295 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
1296 | chunk_number = r_sector; | |
1297 | BUG_ON(r_sector != chunk_number); | |
1298 | ||
1299 | /* | |
1300 | * Compute the stripe number | |
1301 | */ | |
1302 | stripe = chunk_number / data_disks; | |
1303 | ||
1304 | /* | |
1305 | * Compute the data disk and parity disk indexes inside the stripe | |
1306 | */ | |
1307 | *dd_idx = chunk_number % data_disks; | |
1308 | ||
1309 | /* | |
1310 | * Select the parity disk based on the user selected algorithm. | |
1311 | */ | |
16a53ecc N |
1312 | switch(conf->level) { |
1313 | case 4: | |
1da177e4 | 1314 | *pd_idx = data_disks; |
16a53ecc N |
1315 | break; |
1316 | case 5: | |
1317 | switch (conf->algorithm) { | |
1da177e4 LT |
1318 | case ALGORITHM_LEFT_ASYMMETRIC: |
1319 | *pd_idx = data_disks - stripe % raid_disks; | |
1320 | if (*dd_idx >= *pd_idx) | |
1321 | (*dd_idx)++; | |
1322 | break; | |
1323 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1324 | *pd_idx = stripe % raid_disks; | |
1325 | if (*dd_idx >= *pd_idx) | |
1326 | (*dd_idx)++; | |
1327 | break; | |
1328 | case ALGORITHM_LEFT_SYMMETRIC: | |
1329 | *pd_idx = data_disks - stripe % raid_disks; | |
1330 | *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks; | |
1331 | break; | |
1332 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1333 | *pd_idx = stripe % raid_disks; | |
1334 | *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks; | |
1335 | break; | |
1336 | default: | |
14f8d26b | 1337 | printk(KERN_ERR "raid5: unsupported algorithm %d\n", |
1da177e4 | 1338 | conf->algorithm); |
16a53ecc N |
1339 | } |
1340 | break; | |
1341 | case 6: | |
1342 | ||
1343 | /**** FIX THIS ****/ | |
1344 | switch (conf->algorithm) { | |
1345 | case ALGORITHM_LEFT_ASYMMETRIC: | |
1346 | *pd_idx = raid_disks - 1 - (stripe % raid_disks); | |
1347 | if (*pd_idx == raid_disks-1) | |
1348 | (*dd_idx)++; /* Q D D D P */ | |
1349 | else if (*dd_idx >= *pd_idx) | |
1350 | (*dd_idx) += 2; /* D D P Q D */ | |
1351 | break; | |
1352 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1353 | *pd_idx = stripe % raid_disks; | |
1354 | if (*pd_idx == raid_disks-1) | |
1355 | (*dd_idx)++; /* Q D D D P */ | |
1356 | else if (*dd_idx >= *pd_idx) | |
1357 | (*dd_idx) += 2; /* D D P Q D */ | |
1358 | break; | |
1359 | case ALGORITHM_LEFT_SYMMETRIC: | |
1360 | *pd_idx = raid_disks - 1 - (stripe % raid_disks); | |
1361 | *dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks; | |
1362 | break; | |
1363 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1364 | *pd_idx = stripe % raid_disks; | |
1365 | *dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks; | |
1366 | break; | |
1367 | default: | |
1368 | printk (KERN_CRIT "raid6: unsupported algorithm %d\n", | |
1369 | conf->algorithm); | |
1370 | } | |
1371 | break; | |
1da177e4 LT |
1372 | } |
1373 | ||
1374 | /* | |
1375 | * Finally, compute the new sector number | |
1376 | */ | |
1377 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
1378 | return new_sector; | |
1379 | } | |
1380 | ||
1381 | ||
1382 | static sector_t compute_blocknr(struct stripe_head *sh, int i) | |
1383 | { | |
1384 | raid5_conf_t *conf = sh->raid_conf; | |
b875e531 N |
1385 | int raid_disks = sh->disks; |
1386 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
1387 | sector_t new_sector = sh->sector, check; |
1388 | int sectors_per_chunk = conf->chunk_size >> 9; | |
1389 | sector_t stripe; | |
1390 | int chunk_offset; | |
1391 | int chunk_number, dummy1, dummy2, dd_idx = i; | |
1392 | sector_t r_sector; | |
1393 | ||
16a53ecc | 1394 | |
1da177e4 LT |
1395 | chunk_offset = sector_div(new_sector, sectors_per_chunk); |
1396 | stripe = new_sector; | |
1397 | BUG_ON(new_sector != stripe); | |
1398 | ||
16a53ecc N |
1399 | if (i == sh->pd_idx) |
1400 | return 0; | |
1401 | switch(conf->level) { | |
1402 | case 4: break; | |
1403 | case 5: | |
1404 | switch (conf->algorithm) { | |
1da177e4 LT |
1405 | case ALGORITHM_LEFT_ASYMMETRIC: |
1406 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1407 | if (i > sh->pd_idx) | |
1408 | i--; | |
1409 | break; | |
1410 | case ALGORITHM_LEFT_SYMMETRIC: | |
1411 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1412 | if (i < sh->pd_idx) | |
1413 | i += raid_disks; | |
1414 | i -= (sh->pd_idx + 1); | |
1415 | break; | |
1416 | default: | |
14f8d26b | 1417 | printk(KERN_ERR "raid5: unsupported algorithm %d\n", |
16a53ecc N |
1418 | conf->algorithm); |
1419 | } | |
1420 | break; | |
1421 | case 6: | |
16a53ecc N |
1422 | if (i == raid6_next_disk(sh->pd_idx, raid_disks)) |
1423 | return 0; /* It is the Q disk */ | |
1424 | switch (conf->algorithm) { | |
1425 | case ALGORITHM_LEFT_ASYMMETRIC: | |
1426 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
1427 | if (sh->pd_idx == raid_disks-1) | |
1428 | i--; /* Q D D D P */ | |
1429 | else if (i > sh->pd_idx) | |
1430 | i -= 2; /* D D P Q D */ | |
1431 | break; | |
1432 | case ALGORITHM_LEFT_SYMMETRIC: | |
1433 | case ALGORITHM_RIGHT_SYMMETRIC: | |
1434 | if (sh->pd_idx == raid_disks-1) | |
1435 | i--; /* Q D D D P */ | |
1436 | else { | |
1437 | /* D D P Q D */ | |
1438 | if (i < sh->pd_idx) | |
1439 | i += raid_disks; | |
1440 | i -= (sh->pd_idx + 2); | |
1441 | } | |
1442 | break; | |
1443 | default: | |
1444 | printk (KERN_CRIT "raid6: unsupported algorithm %d\n", | |
1da177e4 | 1445 | conf->algorithm); |
16a53ecc N |
1446 | } |
1447 | break; | |
1da177e4 LT |
1448 | } |
1449 | ||
1450 | chunk_number = stripe * data_disks + i; | |
1451 | r_sector = (sector_t)chunk_number * sectors_per_chunk + chunk_offset; | |
1452 | ||
1453 | check = raid5_compute_sector (r_sector, raid_disks, data_disks, &dummy1, &dummy2, conf); | |
1454 | if (check != sh->sector || dummy1 != dd_idx || dummy2 != sh->pd_idx) { | |
14f8d26b | 1455 | printk(KERN_ERR "compute_blocknr: map not correct\n"); |
1da177e4 LT |
1456 | return 0; |
1457 | } | |
1458 | return r_sector; | |
1459 | } | |
1460 | ||
1461 | ||
1462 | ||
1463 | /* | |
16a53ecc N |
1464 | * Copy data between a page in the stripe cache, and one or more bion |
1465 | * The page could align with the middle of the bio, or there could be | |
1466 | * several bion, each with several bio_vecs, which cover part of the page | |
1467 | * Multiple bion are linked together on bi_next. There may be extras | |
1468 | * at the end of this list. We ignore them. | |
1da177e4 LT |
1469 | */ |
1470 | static void copy_data(int frombio, struct bio *bio, | |
1471 | struct page *page, | |
1472 | sector_t sector) | |
1473 | { | |
1474 | char *pa = page_address(page); | |
1475 | struct bio_vec *bvl; | |
1476 | int i; | |
1477 | int page_offset; | |
1478 | ||
1479 | if (bio->bi_sector >= sector) | |
1480 | page_offset = (signed)(bio->bi_sector - sector) * 512; | |
1481 | else | |
1482 | page_offset = (signed)(sector - bio->bi_sector) * -512; | |
1483 | bio_for_each_segment(bvl, bio, i) { | |
1484 | int len = bio_iovec_idx(bio,i)->bv_len; | |
1485 | int clen; | |
1486 | int b_offset = 0; | |
1487 | ||
1488 | if (page_offset < 0) { | |
1489 | b_offset = -page_offset; | |
1490 | page_offset += b_offset; | |
1491 | len -= b_offset; | |
1492 | } | |
1493 | ||
1494 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
1495 | clen = STRIPE_SIZE - page_offset; | |
1496 | else clen = len; | |
16a53ecc | 1497 | |
1da177e4 LT |
1498 | if (clen > 0) { |
1499 | char *ba = __bio_kmap_atomic(bio, i, KM_USER0); | |
1500 | if (frombio) | |
1501 | memcpy(pa+page_offset, ba+b_offset, clen); | |
1502 | else | |
1503 | memcpy(ba+b_offset, pa+page_offset, clen); | |
1504 | __bio_kunmap_atomic(ba, KM_USER0); | |
1505 | } | |
1506 | if (clen < len) /* hit end of page */ | |
1507 | break; | |
1508 | page_offset += len; | |
1509 | } | |
1510 | } | |
1511 | ||
9bc89cd8 DW |
1512 | #define check_xor() do { \ |
1513 | if (count == MAX_XOR_BLOCKS) { \ | |
1514 | xor_blocks(count, STRIPE_SIZE, dest, ptr);\ | |
1515 | count = 0; \ | |
1516 | } \ | |
1da177e4 LT |
1517 | } while(0) |
1518 | ||
1519 | ||
1520 | static void compute_block(struct stripe_head *sh, int dd_idx) | |
1521 | { | |
7ecaa1e6 | 1522 | int i, count, disks = sh->disks; |
9bc89cd8 | 1523 | void *ptr[MAX_XOR_BLOCKS], *dest, *p; |
1da177e4 | 1524 | |
45b4233c | 1525 | pr_debug("compute_block, stripe %llu, idx %d\n", |
1da177e4 LT |
1526 | (unsigned long long)sh->sector, dd_idx); |
1527 | ||
9bc89cd8 DW |
1528 | dest = page_address(sh->dev[dd_idx].page); |
1529 | memset(dest, 0, STRIPE_SIZE); | |
1530 | count = 0; | |
1da177e4 LT |
1531 | for (i = disks ; i--; ) { |
1532 | if (i == dd_idx) | |
1533 | continue; | |
1534 | p = page_address(sh->dev[i].page); | |
1535 | if (test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1536 | ptr[count++] = p; | |
1537 | else | |
14f8d26b | 1538 | printk(KERN_ERR "compute_block() %d, stripe %llu, %d" |
1da177e4 LT |
1539 | " not present\n", dd_idx, |
1540 | (unsigned long long)sh->sector, i); | |
1541 | ||
1542 | check_xor(); | |
1543 | } | |
9bc89cd8 DW |
1544 | if (count) |
1545 | xor_blocks(count, STRIPE_SIZE, dest, ptr); | |
1da177e4 LT |
1546 | set_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); |
1547 | } | |
1548 | ||
16a53ecc | 1549 | static void compute_parity5(struct stripe_head *sh, int method) |
1da177e4 LT |
1550 | { |
1551 | raid5_conf_t *conf = sh->raid_conf; | |
7ecaa1e6 | 1552 | int i, pd_idx = sh->pd_idx, disks = sh->disks, count; |
9bc89cd8 | 1553 | void *ptr[MAX_XOR_BLOCKS], *dest; |
1da177e4 LT |
1554 | struct bio *chosen; |
1555 | ||
45b4233c | 1556 | pr_debug("compute_parity5, stripe %llu, method %d\n", |
1da177e4 LT |
1557 | (unsigned long long)sh->sector, method); |
1558 | ||
9bc89cd8 DW |
1559 | count = 0; |
1560 | dest = page_address(sh->dev[pd_idx].page); | |
1da177e4 LT |
1561 | switch(method) { |
1562 | case READ_MODIFY_WRITE: | |
78bafebd | 1563 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags)); |
1da177e4 LT |
1564 | for (i=disks ; i-- ;) { |
1565 | if (i==pd_idx) | |
1566 | continue; | |
1567 | if (sh->dev[i].towrite && | |
1568 | test_bit(R5_UPTODATE, &sh->dev[i].flags)) { | |
1569 | ptr[count++] = page_address(sh->dev[i].page); | |
1570 | chosen = sh->dev[i].towrite; | |
1571 | sh->dev[i].towrite = NULL; | |
1572 | ||
1573 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1574 | wake_up(&conf->wait_for_overlap); | |
1575 | ||
78bafebd | 1576 | BUG_ON(sh->dev[i].written); |
1da177e4 LT |
1577 | sh->dev[i].written = chosen; |
1578 | check_xor(); | |
1579 | } | |
1580 | } | |
1581 | break; | |
1582 | case RECONSTRUCT_WRITE: | |
9bc89cd8 | 1583 | memset(dest, 0, STRIPE_SIZE); |
1da177e4 LT |
1584 | for (i= disks; i-- ;) |
1585 | if (i!=pd_idx && sh->dev[i].towrite) { | |
1586 | chosen = sh->dev[i].towrite; | |
1587 | sh->dev[i].towrite = NULL; | |
1588 | ||
1589 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1590 | wake_up(&conf->wait_for_overlap); | |
1591 | ||
78bafebd | 1592 | BUG_ON(sh->dev[i].written); |
1da177e4 LT |
1593 | sh->dev[i].written = chosen; |
1594 | } | |
1595 | break; | |
1596 | case CHECK_PARITY: | |
1597 | break; | |
1598 | } | |
9bc89cd8 DW |
1599 | if (count) { |
1600 | xor_blocks(count, STRIPE_SIZE, dest, ptr); | |
1601 | count = 0; | |
1da177e4 LT |
1602 | } |
1603 | ||
1604 | for (i = disks; i--;) | |
1605 | if (sh->dev[i].written) { | |
1606 | sector_t sector = sh->dev[i].sector; | |
1607 | struct bio *wbi = sh->dev[i].written; | |
1608 | while (wbi && wbi->bi_sector < sector + STRIPE_SECTORS) { | |
1609 | copy_data(1, wbi, sh->dev[i].page, sector); | |
1610 | wbi = r5_next_bio(wbi, sector); | |
1611 | } | |
1612 | ||
1613 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
1614 | set_bit(R5_UPTODATE, &sh->dev[i].flags); | |
1615 | } | |
1616 | ||
1617 | switch(method) { | |
1618 | case RECONSTRUCT_WRITE: | |
1619 | case CHECK_PARITY: | |
1620 | for (i=disks; i--;) | |
1621 | if (i != pd_idx) { | |
1622 | ptr[count++] = page_address(sh->dev[i].page); | |
1623 | check_xor(); | |
1624 | } | |
1625 | break; | |
1626 | case READ_MODIFY_WRITE: | |
1627 | for (i = disks; i--;) | |
1628 | if (sh->dev[i].written) { | |
1629 | ptr[count++] = page_address(sh->dev[i].page); | |
1630 | check_xor(); | |
1631 | } | |
1632 | } | |
9bc89cd8 DW |
1633 | if (count) |
1634 | xor_blocks(count, STRIPE_SIZE, dest, ptr); | |
1635 | ||
1da177e4 LT |
1636 | if (method != CHECK_PARITY) { |
1637 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1638 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
1639 | } else | |
1640 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1641 | } | |
1642 | ||
16a53ecc N |
1643 | static void compute_parity6(struct stripe_head *sh, int method) |
1644 | { | |
1645 | raid6_conf_t *conf = sh->raid_conf; | |
f416885e | 1646 | int i, pd_idx = sh->pd_idx, qd_idx, d0_idx, disks = sh->disks, count; |
16a53ecc N |
1647 | struct bio *chosen; |
1648 | /**** FIX THIS: This could be very bad if disks is close to 256 ****/ | |
1649 | void *ptrs[disks]; | |
1650 | ||
1651 | qd_idx = raid6_next_disk(pd_idx, disks); | |
1652 | d0_idx = raid6_next_disk(qd_idx, disks); | |
1653 | ||
45b4233c | 1654 | pr_debug("compute_parity, stripe %llu, method %d\n", |
16a53ecc N |
1655 | (unsigned long long)sh->sector, method); |
1656 | ||
1657 | switch(method) { | |
1658 | case READ_MODIFY_WRITE: | |
1659 | BUG(); /* READ_MODIFY_WRITE N/A for RAID-6 */ | |
1660 | case RECONSTRUCT_WRITE: | |
1661 | for (i= disks; i-- ;) | |
1662 | if ( i != pd_idx && i != qd_idx && sh->dev[i].towrite ) { | |
1663 | chosen = sh->dev[i].towrite; | |
1664 | sh->dev[i].towrite = NULL; | |
1665 | ||
1666 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
1667 | wake_up(&conf->wait_for_overlap); | |
1668 | ||
52e5f9d1 | 1669 | BUG_ON(sh->dev[i].written); |
16a53ecc N |
1670 | sh->dev[i].written = chosen; |
1671 | } | |
1672 | break; | |
1673 | case CHECK_PARITY: | |
1674 | BUG(); /* Not implemented yet */ | |
1675 | } | |
1676 | ||
1677 | for (i = disks; i--;) | |
1678 | if (sh->dev[i].written) { | |
1679 | sector_t sector = sh->dev[i].sector; | |
1680 | struct bio *wbi = sh->dev[i].written; | |
1681 | while (wbi && wbi->bi_sector < sector + STRIPE_SECTORS) { | |
1682 | copy_data(1, wbi, sh->dev[i].page, sector); | |
1683 | wbi = r5_next_bio(wbi, sector); | |
1684 | } | |
1685 | ||
1686 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
1687 | set_bit(R5_UPTODATE, &sh->dev[i].flags); | |
1688 | } | |
1689 | ||
1690 | // switch(method) { | |
1691 | // case RECONSTRUCT_WRITE: | |
1692 | // case CHECK_PARITY: | |
1693 | // case UPDATE_PARITY: | |
1694 | /* Note that unlike RAID-5, the ordering of the disks matters greatly. */ | |
1695 | /* FIX: Is this ordering of drives even remotely optimal? */ | |
1696 | count = 0; | |
1697 | i = d0_idx; | |
1698 | do { | |
1699 | ptrs[count++] = page_address(sh->dev[i].page); | |
1700 | if (count <= disks-2 && !test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1701 | printk("block %d/%d not uptodate on parity calc\n", i,count); | |
1702 | i = raid6_next_disk(i, disks); | |
1703 | } while ( i != d0_idx ); | |
1704 | // break; | |
1705 | // } | |
1706 | ||
1707 | raid6_call.gen_syndrome(disks, STRIPE_SIZE, ptrs); | |
1708 | ||
1709 | switch(method) { | |
1710 | case RECONSTRUCT_WRITE: | |
1711 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1712 | set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); | |
1713 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
1714 | set_bit(R5_LOCKED, &sh->dev[qd_idx].flags); | |
1715 | break; | |
1716 | case UPDATE_PARITY: | |
1717 | set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1718 | set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); | |
1719 | break; | |
1720 | } | |
1721 | } | |
1722 | ||
1723 | ||
1724 | /* Compute one missing block */ | |
1725 | static void compute_block_1(struct stripe_head *sh, int dd_idx, int nozero) | |
1726 | { | |
f416885e | 1727 | int i, count, disks = sh->disks; |
9bc89cd8 | 1728 | void *ptr[MAX_XOR_BLOCKS], *dest, *p; |
16a53ecc N |
1729 | int pd_idx = sh->pd_idx; |
1730 | int qd_idx = raid6_next_disk(pd_idx, disks); | |
1731 | ||
45b4233c | 1732 | pr_debug("compute_block_1, stripe %llu, idx %d\n", |
16a53ecc N |
1733 | (unsigned long long)sh->sector, dd_idx); |
1734 | ||
1735 | if ( dd_idx == qd_idx ) { | |
1736 | /* We're actually computing the Q drive */ | |
1737 | compute_parity6(sh, UPDATE_PARITY); | |
1738 | } else { | |
9bc89cd8 DW |
1739 | dest = page_address(sh->dev[dd_idx].page); |
1740 | if (!nozero) memset(dest, 0, STRIPE_SIZE); | |
1741 | count = 0; | |
16a53ecc N |
1742 | for (i = disks ; i--; ) { |
1743 | if (i == dd_idx || i == qd_idx) | |
1744 | continue; | |
1745 | p = page_address(sh->dev[i].page); | |
1746 | if (test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1747 | ptr[count++] = p; | |
1748 | else | |
1749 | printk("compute_block() %d, stripe %llu, %d" | |
1750 | " not present\n", dd_idx, | |
1751 | (unsigned long long)sh->sector, i); | |
1752 | ||
1753 | check_xor(); | |
1754 | } | |
9bc89cd8 DW |
1755 | if (count) |
1756 | xor_blocks(count, STRIPE_SIZE, dest, ptr); | |
16a53ecc N |
1757 | if (!nozero) set_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); |
1758 | else clear_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); | |
1759 | } | |
1760 | } | |
1761 | ||
1762 | /* Compute two missing blocks */ | |
1763 | static void compute_block_2(struct stripe_head *sh, int dd_idx1, int dd_idx2) | |
1764 | { | |
f416885e | 1765 | int i, count, disks = sh->disks; |
16a53ecc N |
1766 | int pd_idx = sh->pd_idx; |
1767 | int qd_idx = raid6_next_disk(pd_idx, disks); | |
1768 | int d0_idx = raid6_next_disk(qd_idx, disks); | |
1769 | int faila, failb; | |
1770 | ||
1771 | /* faila and failb are disk numbers relative to d0_idx */ | |
1772 | /* pd_idx become disks-2 and qd_idx become disks-1 */ | |
1773 | faila = (dd_idx1 < d0_idx) ? dd_idx1+(disks-d0_idx) : dd_idx1-d0_idx; | |
1774 | failb = (dd_idx2 < d0_idx) ? dd_idx2+(disks-d0_idx) : dd_idx2-d0_idx; | |
1775 | ||
1776 | BUG_ON(faila == failb); | |
1777 | if ( failb < faila ) { int tmp = faila; faila = failb; failb = tmp; } | |
1778 | ||
45b4233c | 1779 | pr_debug("compute_block_2, stripe %llu, idx %d,%d (%d,%d)\n", |
16a53ecc N |
1780 | (unsigned long long)sh->sector, dd_idx1, dd_idx2, faila, failb); |
1781 | ||
1782 | if ( failb == disks-1 ) { | |
1783 | /* Q disk is one of the missing disks */ | |
1784 | if ( faila == disks-2 ) { | |
1785 | /* Missing P+Q, just recompute */ | |
1786 | compute_parity6(sh, UPDATE_PARITY); | |
1787 | return; | |
1788 | } else { | |
1789 | /* We're missing D+Q; recompute D from P */ | |
1790 | compute_block_1(sh, (dd_idx1 == qd_idx) ? dd_idx2 : dd_idx1, 0); | |
1791 | compute_parity6(sh, UPDATE_PARITY); /* Is this necessary? */ | |
1792 | return; | |
1793 | } | |
1794 | } | |
1795 | ||
1796 | /* We're missing D+P or D+D; build pointer table */ | |
1797 | { | |
1798 | /**** FIX THIS: This could be very bad if disks is close to 256 ****/ | |
1799 | void *ptrs[disks]; | |
1800 | ||
1801 | count = 0; | |
1802 | i = d0_idx; | |
1803 | do { | |
1804 | ptrs[count++] = page_address(sh->dev[i].page); | |
1805 | i = raid6_next_disk(i, disks); | |
1806 | if (i != dd_idx1 && i != dd_idx2 && | |
1807 | !test_bit(R5_UPTODATE, &sh->dev[i].flags)) | |
1808 | printk("compute_2 with missing block %d/%d\n", count, i); | |
1809 | } while ( i != d0_idx ); | |
1810 | ||
1811 | if ( failb == disks-2 ) { | |
1812 | /* We're missing D+P. */ | |
1813 | raid6_datap_recov(disks, STRIPE_SIZE, faila, ptrs); | |
1814 | } else { | |
1815 | /* We're missing D+D. */ | |
1816 | raid6_2data_recov(disks, STRIPE_SIZE, faila, failb, ptrs); | |
1817 | } | |
1818 | ||
1819 | /* Both the above update both missing blocks */ | |
1820 | set_bit(R5_UPTODATE, &sh->dev[dd_idx1].flags); | |
1821 | set_bit(R5_UPTODATE, &sh->dev[dd_idx2].flags); | |
1822 | } | |
1823 | } | |
1824 | ||
e33129d8 DW |
1825 | static int |
1826 | handle_write_operations5(struct stripe_head *sh, int rcw, int expand) | |
1827 | { | |
1828 | int i, pd_idx = sh->pd_idx, disks = sh->disks; | |
1829 | int locked = 0; | |
1830 | ||
1831 | if (rcw) { | |
1832 | /* if we are not expanding this is a proper write request, and | |
1833 | * there will be bios with new data to be drained into the | |
1834 | * stripe cache | |
1835 | */ | |
1836 | if (!expand) { | |
1837 | set_bit(STRIPE_OP_BIODRAIN, &sh->ops.pending); | |
1838 | sh->ops.count++; | |
1839 | } | |
16a53ecc | 1840 | |
e33129d8 DW |
1841 | set_bit(STRIPE_OP_POSTXOR, &sh->ops.pending); |
1842 | sh->ops.count++; | |
1843 | ||
1844 | for (i = disks; i--; ) { | |
1845 | struct r5dev *dev = &sh->dev[i]; | |
1846 | ||
1847 | if (dev->towrite) { | |
1848 | set_bit(R5_LOCKED, &dev->flags); | |
1849 | if (!expand) | |
1850 | clear_bit(R5_UPTODATE, &dev->flags); | |
1851 | locked++; | |
1852 | } | |
1853 | } | |
1854 | } else { | |
1855 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || | |
1856 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
1857 | ||
1858 | set_bit(STRIPE_OP_PREXOR, &sh->ops.pending); | |
1859 | set_bit(STRIPE_OP_BIODRAIN, &sh->ops.pending); | |
1860 | set_bit(STRIPE_OP_POSTXOR, &sh->ops.pending); | |
1861 | ||
1862 | sh->ops.count += 3; | |
1863 | ||
1864 | for (i = disks; i--; ) { | |
1865 | struct r5dev *dev = &sh->dev[i]; | |
1866 | if (i == pd_idx) | |
1867 | continue; | |
1868 | ||
1869 | /* For a read-modify write there may be blocks that are | |
1870 | * locked for reading while others are ready to be | |
1871 | * written so we distinguish these blocks by the | |
1872 | * R5_Wantprexor bit | |
1873 | */ | |
1874 | if (dev->towrite && | |
1875 | (test_bit(R5_UPTODATE, &dev->flags) || | |
1876 | test_bit(R5_Wantcompute, &dev->flags))) { | |
1877 | set_bit(R5_Wantprexor, &dev->flags); | |
1878 | set_bit(R5_LOCKED, &dev->flags); | |
1879 | clear_bit(R5_UPTODATE, &dev->flags); | |
1880 | locked++; | |
1881 | } | |
1882 | } | |
1883 | } | |
1884 | ||
1885 | /* keep the parity disk locked while asynchronous operations | |
1886 | * are in flight | |
1887 | */ | |
1888 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
1889 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
1890 | locked++; | |
1891 | ||
1892 | pr_debug("%s: stripe %llu locked: %d pending: %lx\n", | |
1893 | __FUNCTION__, (unsigned long long)sh->sector, | |
1894 | locked, sh->ops.pending); | |
1895 | ||
1896 | return locked; | |
1897 | } | |
16a53ecc | 1898 | |
1da177e4 LT |
1899 | /* |
1900 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 1901 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
1902 | * The bi_next chain must be in order. |
1903 | */ | |
1904 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, int forwrite) | |
1905 | { | |
1906 | struct bio **bip; | |
1907 | raid5_conf_t *conf = sh->raid_conf; | |
72626685 | 1908 | int firstwrite=0; |
1da177e4 | 1909 | |
45b4233c | 1910 | pr_debug("adding bh b#%llu to stripe s#%llu\n", |
1da177e4 LT |
1911 | (unsigned long long)bi->bi_sector, |
1912 | (unsigned long long)sh->sector); | |
1913 | ||
1914 | ||
1915 | spin_lock(&sh->lock); | |
1916 | spin_lock_irq(&conf->device_lock); | |
72626685 | 1917 | if (forwrite) { |
1da177e4 | 1918 | bip = &sh->dev[dd_idx].towrite; |
72626685 N |
1919 | if (*bip == NULL && sh->dev[dd_idx].written == NULL) |
1920 | firstwrite = 1; | |
1921 | } else | |
1da177e4 LT |
1922 | bip = &sh->dev[dd_idx].toread; |
1923 | while (*bip && (*bip)->bi_sector < bi->bi_sector) { | |
1924 | if ((*bip)->bi_sector + ((*bip)->bi_size >> 9) > bi->bi_sector) | |
1925 | goto overlap; | |
1926 | bip = & (*bip)->bi_next; | |
1927 | } | |
1928 | if (*bip && (*bip)->bi_sector < bi->bi_sector + ((bi->bi_size)>>9)) | |
1929 | goto overlap; | |
1930 | ||
78bafebd | 1931 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
1932 | if (*bip) |
1933 | bi->bi_next = *bip; | |
1934 | *bip = bi; | |
1935 | bi->bi_phys_segments ++; | |
1936 | spin_unlock_irq(&conf->device_lock); | |
1937 | spin_unlock(&sh->lock); | |
1938 | ||
45b4233c | 1939 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", |
1da177e4 LT |
1940 | (unsigned long long)bi->bi_sector, |
1941 | (unsigned long long)sh->sector, dd_idx); | |
1942 | ||
72626685 | 1943 | if (conf->mddev->bitmap && firstwrite) { |
72626685 N |
1944 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, |
1945 | STRIPE_SECTORS, 0); | |
ae3c20cc | 1946 | sh->bm_seq = conf->seq_flush+1; |
72626685 N |
1947 | set_bit(STRIPE_BIT_DELAY, &sh->state); |
1948 | } | |
1949 | ||
1da177e4 LT |
1950 | if (forwrite) { |
1951 | /* check if page is covered */ | |
1952 | sector_t sector = sh->dev[dd_idx].sector; | |
1953 | for (bi=sh->dev[dd_idx].towrite; | |
1954 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
1955 | bi && bi->bi_sector <= sector; | |
1956 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { | |
1957 | if (bi->bi_sector + (bi->bi_size>>9) >= sector) | |
1958 | sector = bi->bi_sector + (bi->bi_size>>9); | |
1959 | } | |
1960 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
1961 | set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags); | |
1962 | } | |
1963 | return 1; | |
1964 | ||
1965 | overlap: | |
1966 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
1967 | spin_unlock_irq(&conf->device_lock); | |
1968 | spin_unlock(&sh->lock); | |
1969 | return 0; | |
1970 | } | |
1971 | ||
29269553 N |
1972 | static void end_reshape(raid5_conf_t *conf); |
1973 | ||
16a53ecc N |
1974 | static int page_is_zero(struct page *p) |
1975 | { | |
1976 | char *a = page_address(p); | |
1977 | return ((*(u32*)a) == 0 && | |
1978 | memcmp(a, a+4, STRIPE_SIZE-4)==0); | |
1979 | } | |
1980 | ||
ccfcc3c1 N |
1981 | static int stripe_to_pdidx(sector_t stripe, raid5_conf_t *conf, int disks) |
1982 | { | |
1983 | int sectors_per_chunk = conf->chunk_size >> 9; | |
ccfcc3c1 | 1984 | int pd_idx, dd_idx; |
2d2063ce CQH |
1985 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
1986 | ||
b875e531 N |
1987 | raid5_compute_sector(stripe * (disks - conf->max_degraded) |
1988 | *sectors_per_chunk + chunk_offset, | |
1989 | disks, disks - conf->max_degraded, | |
1990 | &dd_idx, &pd_idx, conf); | |
ccfcc3c1 N |
1991 | return pd_idx; |
1992 | } | |
1993 | ||
a4456856 DW |
1994 | static void |
1995 | handle_requests_to_failed_array(raid5_conf_t *conf, struct stripe_head *sh, | |
1996 | struct stripe_head_state *s, int disks, | |
1997 | struct bio **return_bi) | |
1998 | { | |
1999 | int i; | |
2000 | for (i = disks; i--; ) { | |
2001 | struct bio *bi; | |
2002 | int bitmap_end = 0; | |
2003 | ||
2004 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
2005 | mdk_rdev_t *rdev; | |
2006 | rcu_read_lock(); | |
2007 | rdev = rcu_dereference(conf->disks[i].rdev); | |
2008 | if (rdev && test_bit(In_sync, &rdev->flags)) | |
2009 | /* multiple read failures in one stripe */ | |
2010 | md_error(conf->mddev, rdev); | |
2011 | rcu_read_unlock(); | |
2012 | } | |
2013 | spin_lock_irq(&conf->device_lock); | |
2014 | /* fail all writes first */ | |
2015 | bi = sh->dev[i].towrite; | |
2016 | sh->dev[i].towrite = NULL; | |
2017 | if (bi) { | |
2018 | s->to_write--; | |
2019 | bitmap_end = 1; | |
2020 | } | |
2021 | ||
2022 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2023 | wake_up(&conf->wait_for_overlap); | |
2024 | ||
2025 | while (bi && bi->bi_sector < | |
2026 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2027 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
2028 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
2029 | if (--bi->bi_phys_segments == 0) { | |
2030 | md_write_end(conf->mddev); | |
2031 | bi->bi_next = *return_bi; | |
2032 | *return_bi = bi; | |
2033 | } | |
2034 | bi = nextbi; | |
2035 | } | |
2036 | /* and fail all 'written' */ | |
2037 | bi = sh->dev[i].written; | |
2038 | sh->dev[i].written = NULL; | |
2039 | if (bi) bitmap_end = 1; | |
2040 | while (bi && bi->bi_sector < | |
2041 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2042 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
2043 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
2044 | if (--bi->bi_phys_segments == 0) { | |
2045 | md_write_end(conf->mddev); | |
2046 | bi->bi_next = *return_bi; | |
2047 | *return_bi = bi; | |
2048 | } | |
2049 | bi = bi2; | |
2050 | } | |
2051 | ||
2052 | /* fail any reads if this device is non-operational */ | |
2053 | if (!test_bit(R5_Insync, &sh->dev[i].flags) || | |
2054 | test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
2055 | bi = sh->dev[i].toread; | |
2056 | sh->dev[i].toread = NULL; | |
2057 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2058 | wake_up(&conf->wait_for_overlap); | |
2059 | if (bi) s->to_read--; | |
2060 | while (bi && bi->bi_sector < | |
2061 | sh->dev[i].sector + STRIPE_SECTORS) { | |
2062 | struct bio *nextbi = | |
2063 | r5_next_bio(bi, sh->dev[i].sector); | |
2064 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
2065 | if (--bi->bi_phys_segments == 0) { | |
2066 | bi->bi_next = *return_bi; | |
2067 | *return_bi = bi; | |
2068 | } | |
2069 | bi = nextbi; | |
2070 | } | |
2071 | } | |
2072 | spin_unlock_irq(&conf->device_lock); | |
2073 | if (bitmap_end) | |
2074 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
2075 | STRIPE_SECTORS, 0, 0); | |
2076 | } | |
2077 | ||
2078 | } | |
2079 | ||
f38e1219 DW |
2080 | /* __handle_issuing_new_read_requests5 - returns 0 if there are no more disks |
2081 | * to process | |
2082 | */ | |
2083 | static int __handle_issuing_new_read_requests5(struct stripe_head *sh, | |
2084 | struct stripe_head_state *s, int disk_idx, int disks) | |
2085 | { | |
2086 | struct r5dev *dev = &sh->dev[disk_idx]; | |
2087 | struct r5dev *failed_dev = &sh->dev[s->failed_num]; | |
2088 | ||
2089 | /* don't schedule compute operations or reads on the parity block while | |
2090 | * a check is in flight | |
2091 | */ | |
2092 | if ((disk_idx == sh->pd_idx) && | |
2093 | test_bit(STRIPE_OP_CHECK, &sh->ops.pending)) | |
2094 | return ~0; | |
2095 | ||
2096 | /* is the data in this block needed, and can we get it? */ | |
2097 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2098 | !test_bit(R5_UPTODATE, &dev->flags) && (dev->toread || | |
2099 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || | |
2100 | s->syncing || s->expanding || (s->failed && | |
2101 | (failed_dev->toread || (failed_dev->towrite && | |
2102 | !test_bit(R5_OVERWRITE, &failed_dev->flags) | |
2103 | ))))) { | |
2104 | /* 1/ We would like to get this block, possibly by computing it, | |
2105 | * but we might not be able to. | |
2106 | * | |
2107 | * 2/ Since parity check operations potentially make the parity | |
2108 | * block !uptodate it will need to be refreshed before any | |
2109 | * compute operations on data disks are scheduled. | |
2110 | * | |
2111 | * 3/ We hold off parity block re-reads until check operations | |
2112 | * have quiesced. | |
2113 | */ | |
2114 | if ((s->uptodate == disks - 1) && | |
2115 | !test_bit(STRIPE_OP_CHECK, &sh->ops.pending)) { | |
2116 | set_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending); | |
2117 | set_bit(R5_Wantcompute, &dev->flags); | |
2118 | sh->ops.target = disk_idx; | |
2119 | s->req_compute = 1; | |
2120 | sh->ops.count++; | |
2121 | /* Careful: from this point on 'uptodate' is in the eye | |
2122 | * of raid5_run_ops which services 'compute' operations | |
2123 | * before writes. R5_Wantcompute flags a block that will | |
2124 | * be R5_UPTODATE by the time it is needed for a | |
2125 | * subsequent operation. | |
2126 | */ | |
2127 | s->uptodate++; | |
2128 | return 0; /* uptodate + compute == disks */ | |
2129 | } else if ((s->uptodate < disks - 1) && | |
2130 | test_bit(R5_Insync, &dev->flags)) { | |
2131 | /* Note: we hold off compute operations while checks are | |
2132 | * in flight, but we still prefer 'compute' over 'read' | |
2133 | * hence we only read if (uptodate < * disks-1) | |
2134 | */ | |
2135 | set_bit(R5_LOCKED, &dev->flags); | |
2136 | set_bit(R5_Wantread, &dev->flags); | |
2137 | if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending)) | |
2138 | sh->ops.count++; | |
2139 | s->locked++; | |
2140 | pr_debug("Reading block %d (sync=%d)\n", disk_idx, | |
2141 | s->syncing); | |
2142 | } | |
2143 | } | |
2144 | ||
2145 | return ~0; | |
2146 | } | |
2147 | ||
a4456856 DW |
2148 | static void handle_issuing_new_read_requests5(struct stripe_head *sh, |
2149 | struct stripe_head_state *s, int disks) | |
2150 | { | |
2151 | int i; | |
f38e1219 DW |
2152 | |
2153 | /* Clear completed compute operations. Parity recovery | |
2154 | * (STRIPE_OP_MOD_REPAIR_PD) implies a write-back which is handled | |
2155 | * later on in this routine | |
2156 | */ | |
2157 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.complete) && | |
2158 | !test_bit(STRIPE_OP_MOD_REPAIR_PD, &sh->ops.pending)) { | |
2159 | clear_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.complete); | |
2160 | clear_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.ack); | |
2161 | clear_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending); | |
2162 | } | |
2163 | ||
2164 | /* look for blocks to read/compute, skip this if a compute | |
2165 | * is already in flight, or if the stripe contents are in the | |
2166 | * midst of changing due to a write | |
2167 | */ | |
2168 | if (!test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending) && | |
2169 | !test_bit(STRIPE_OP_PREXOR, &sh->ops.pending) && | |
2170 | !test_bit(STRIPE_OP_POSTXOR, &sh->ops.pending)) { | |
2171 | for (i = disks; i--; ) | |
2172 | if (__handle_issuing_new_read_requests5( | |
2173 | sh, s, i, disks) == 0) | |
2174 | break; | |
a4456856 DW |
2175 | } |
2176 | set_bit(STRIPE_HANDLE, &sh->state); | |
2177 | } | |
2178 | ||
2179 | static void handle_issuing_new_read_requests6(struct stripe_head *sh, | |
2180 | struct stripe_head_state *s, struct r6_state *r6s, | |
2181 | int disks) | |
2182 | { | |
2183 | int i; | |
2184 | for (i = disks; i--; ) { | |
2185 | struct r5dev *dev = &sh->dev[i]; | |
2186 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2187 | !test_bit(R5_UPTODATE, &dev->flags) && | |
2188 | (dev->toread || (dev->towrite && | |
2189 | !test_bit(R5_OVERWRITE, &dev->flags)) || | |
2190 | s->syncing || s->expanding || | |
2191 | (s->failed >= 1 && | |
2192 | (sh->dev[r6s->failed_num[0]].toread || | |
2193 | s->to_write)) || | |
2194 | (s->failed >= 2 && | |
2195 | (sh->dev[r6s->failed_num[1]].toread || | |
2196 | s->to_write)))) { | |
2197 | /* we would like to get this block, possibly | |
2198 | * by computing it, but we might not be able to | |
2199 | */ | |
2200 | if (s->uptodate == disks-1) { | |
45b4233c | 2201 | pr_debug("Computing stripe %llu block %d\n", |
a4456856 DW |
2202 | (unsigned long long)sh->sector, i); |
2203 | compute_block_1(sh, i, 0); | |
2204 | s->uptodate++; | |
2205 | } else if ( s->uptodate == disks-2 && s->failed >= 2 ) { | |
2206 | /* Computing 2-failure is *very* expensive; only | |
2207 | * do it if failed >= 2 | |
2208 | */ | |
2209 | int other; | |
2210 | for (other = disks; other--; ) { | |
2211 | if (other == i) | |
2212 | continue; | |
2213 | if (!test_bit(R5_UPTODATE, | |
2214 | &sh->dev[other].flags)) | |
2215 | break; | |
2216 | } | |
2217 | BUG_ON(other < 0); | |
45b4233c | 2218 | pr_debug("Computing stripe %llu blocks %d,%d\n", |
a4456856 DW |
2219 | (unsigned long long)sh->sector, |
2220 | i, other); | |
2221 | compute_block_2(sh, i, other); | |
2222 | s->uptodate += 2; | |
2223 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
2224 | set_bit(R5_LOCKED, &dev->flags); | |
2225 | set_bit(R5_Wantread, &dev->flags); | |
2226 | s->locked++; | |
45b4233c | 2227 | pr_debug("Reading block %d (sync=%d)\n", |
a4456856 DW |
2228 | i, s->syncing); |
2229 | } | |
2230 | } | |
2231 | } | |
2232 | set_bit(STRIPE_HANDLE, &sh->state); | |
2233 | } | |
2234 | ||
2235 | ||
2236 | /* handle_completed_write_requests | |
2237 | * any written block on an uptodate or failed drive can be returned. | |
2238 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
2239 | * never LOCKED, so we don't need to test 'failed' directly. | |
2240 | */ | |
2241 | static void handle_completed_write_requests(raid5_conf_t *conf, | |
2242 | struct stripe_head *sh, int disks, struct bio **return_bi) | |
2243 | { | |
2244 | int i; | |
2245 | struct r5dev *dev; | |
2246 | ||
2247 | for (i = disks; i--; ) | |
2248 | if (sh->dev[i].written) { | |
2249 | dev = &sh->dev[i]; | |
2250 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
2251 | test_bit(R5_UPTODATE, &dev->flags)) { | |
2252 | /* We can return any write requests */ | |
2253 | struct bio *wbi, *wbi2; | |
2254 | int bitmap_end = 0; | |
45b4233c | 2255 | pr_debug("Return write for disc %d\n", i); |
a4456856 DW |
2256 | spin_lock_irq(&conf->device_lock); |
2257 | wbi = dev->written; | |
2258 | dev->written = NULL; | |
2259 | while (wbi && wbi->bi_sector < | |
2260 | dev->sector + STRIPE_SECTORS) { | |
2261 | wbi2 = r5_next_bio(wbi, dev->sector); | |
2262 | if (--wbi->bi_phys_segments == 0) { | |
2263 | md_write_end(conf->mddev); | |
2264 | wbi->bi_next = *return_bi; | |
2265 | *return_bi = wbi; | |
2266 | } | |
2267 | wbi = wbi2; | |
2268 | } | |
2269 | if (dev->towrite == NULL) | |
2270 | bitmap_end = 1; | |
2271 | spin_unlock_irq(&conf->device_lock); | |
2272 | if (bitmap_end) | |
2273 | bitmap_endwrite(conf->mddev->bitmap, | |
2274 | sh->sector, | |
2275 | STRIPE_SECTORS, | |
2276 | !test_bit(STRIPE_DEGRADED, &sh->state), | |
2277 | 0); | |
2278 | } | |
2279 | } | |
2280 | } | |
2281 | ||
2282 | static void handle_issuing_new_write_requests5(raid5_conf_t *conf, | |
2283 | struct stripe_head *sh, struct stripe_head_state *s, int disks) | |
2284 | { | |
2285 | int rmw = 0, rcw = 0, i; | |
2286 | for (i = disks; i--; ) { | |
2287 | /* would I have to read this buffer for read_modify_write */ | |
2288 | struct r5dev *dev = &sh->dev[i]; | |
2289 | if ((dev->towrite || i == sh->pd_idx) && | |
2290 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2291 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2292 | test_bit(R5_Wantcompute, &dev->flags))) { | |
a4456856 DW |
2293 | if (test_bit(R5_Insync, &dev->flags)) |
2294 | rmw++; | |
2295 | else | |
2296 | rmw += 2*disks; /* cannot read it */ | |
2297 | } | |
2298 | /* Would I have to read this buffer for reconstruct_write */ | |
2299 | if (!test_bit(R5_OVERWRITE, &dev->flags) && i != sh->pd_idx && | |
2300 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2301 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2302 | test_bit(R5_Wantcompute, &dev->flags))) { | |
2303 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
a4456856 DW |
2304 | else |
2305 | rcw += 2*disks; | |
2306 | } | |
2307 | } | |
45b4233c | 2308 | pr_debug("for sector %llu, rmw=%d rcw=%d\n", |
a4456856 DW |
2309 | (unsigned long long)sh->sector, rmw, rcw); |
2310 | set_bit(STRIPE_HANDLE, &sh->state); | |
2311 | if (rmw < rcw && rmw > 0) | |
2312 | /* prefer read-modify-write, but need to get some data */ | |
2313 | for (i = disks; i--; ) { | |
2314 | struct r5dev *dev = &sh->dev[i]; | |
2315 | if ((dev->towrite || i == sh->pd_idx) && | |
2316 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2317 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2318 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2319 | test_bit(R5_Insync, &dev->flags)) { |
2320 | if ( | |
2321 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2322 | pr_debug("Read_old block " |
a4456856 DW |
2323 | "%d for r-m-w\n", i); |
2324 | set_bit(R5_LOCKED, &dev->flags); | |
2325 | set_bit(R5_Wantread, &dev->flags); | |
2326 | s->locked++; | |
2327 | } else { | |
2328 | set_bit(STRIPE_DELAYED, &sh->state); | |
2329 | set_bit(STRIPE_HANDLE, &sh->state); | |
2330 | } | |
2331 | } | |
2332 | } | |
2333 | if (rcw <= rmw && rcw > 0) | |
2334 | /* want reconstruct write, but need to get some data */ | |
2335 | for (i = disks; i--; ) { | |
2336 | struct r5dev *dev = &sh->dev[i]; | |
2337 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
2338 | i != sh->pd_idx && | |
2339 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
2340 | !(test_bit(R5_UPTODATE, &dev->flags) || |
2341 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 DW |
2342 | test_bit(R5_Insync, &dev->flags)) { |
2343 | if ( | |
2344 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2345 | pr_debug("Read_old block " |
a4456856 DW |
2346 | "%d for Reconstruct\n", i); |
2347 | set_bit(R5_LOCKED, &dev->flags); | |
2348 | set_bit(R5_Wantread, &dev->flags); | |
2349 | s->locked++; | |
2350 | } else { | |
2351 | set_bit(STRIPE_DELAYED, &sh->state); | |
2352 | set_bit(STRIPE_HANDLE, &sh->state); | |
2353 | } | |
2354 | } | |
2355 | } | |
2356 | /* now if nothing is locked, and if we have enough data, | |
2357 | * we can start a write request | |
2358 | */ | |
f38e1219 DW |
2359 | /* since handle_stripe can be called at any time we need to handle the |
2360 | * case where a compute block operation has been submitted and then a | |
2361 | * subsequent call wants to start a write request. raid5_run_ops only | |
2362 | * handles the case where compute block and postxor are requested | |
2363 | * simultaneously. If this is not the case then new writes need to be | |
2364 | * held off until the compute completes. | |
2365 | */ | |
2366 | if ((s->req_compute || | |
2367 | !test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending)) && | |
2368 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
2369 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) | |
e33129d8 | 2370 | s->locked += handle_write_operations5(sh, rcw == 0, 0); |
a4456856 DW |
2371 | } |
2372 | ||
2373 | static void handle_issuing_new_write_requests6(raid5_conf_t *conf, | |
2374 | struct stripe_head *sh, struct stripe_head_state *s, | |
2375 | struct r6_state *r6s, int disks) | |
2376 | { | |
2377 | int rcw = 0, must_compute = 0, pd_idx = sh->pd_idx, i; | |
2378 | int qd_idx = r6s->qd_idx; | |
2379 | for (i = disks; i--; ) { | |
2380 | struct r5dev *dev = &sh->dev[i]; | |
2381 | /* Would I have to read this buffer for reconstruct_write */ | |
2382 | if (!test_bit(R5_OVERWRITE, &dev->flags) | |
2383 | && i != pd_idx && i != qd_idx | |
2384 | && (!test_bit(R5_LOCKED, &dev->flags) | |
2385 | ) && | |
2386 | !test_bit(R5_UPTODATE, &dev->flags)) { | |
2387 | if (test_bit(R5_Insync, &dev->flags)) rcw++; | |
2388 | else { | |
45b4233c | 2389 | pr_debug("raid6: must_compute: " |
a4456856 DW |
2390 | "disk %d flags=%#lx\n", i, dev->flags); |
2391 | must_compute++; | |
2392 | } | |
2393 | } | |
2394 | } | |
45b4233c | 2395 | pr_debug("for sector %llu, rcw=%d, must_compute=%d\n", |
a4456856 DW |
2396 | (unsigned long long)sh->sector, rcw, must_compute); |
2397 | set_bit(STRIPE_HANDLE, &sh->state); | |
2398 | ||
2399 | if (rcw > 0) | |
2400 | /* want reconstruct write, but need to get some data */ | |
2401 | for (i = disks; i--; ) { | |
2402 | struct r5dev *dev = &sh->dev[i]; | |
2403 | if (!test_bit(R5_OVERWRITE, &dev->flags) | |
2404 | && !(s->failed == 0 && (i == pd_idx || i == qd_idx)) | |
2405 | && !test_bit(R5_LOCKED, &dev->flags) && | |
2406 | !test_bit(R5_UPTODATE, &dev->flags) && | |
2407 | test_bit(R5_Insync, &dev->flags)) { | |
2408 | if ( | |
2409 | test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
45b4233c | 2410 | pr_debug("Read_old stripe %llu " |
a4456856 DW |
2411 | "block %d for Reconstruct\n", |
2412 | (unsigned long long)sh->sector, i); | |
2413 | set_bit(R5_LOCKED, &dev->flags); | |
2414 | set_bit(R5_Wantread, &dev->flags); | |
2415 | s->locked++; | |
2416 | } else { | |
45b4233c | 2417 | pr_debug("Request delayed stripe %llu " |
a4456856 DW |
2418 | "block %d for Reconstruct\n", |
2419 | (unsigned long long)sh->sector, i); | |
2420 | set_bit(STRIPE_DELAYED, &sh->state); | |
2421 | set_bit(STRIPE_HANDLE, &sh->state); | |
2422 | } | |
2423 | } | |
2424 | } | |
2425 | /* now if nothing is locked, and if we have enough data, we can start a | |
2426 | * write request | |
2427 | */ | |
2428 | if (s->locked == 0 && rcw == 0 && | |
2429 | !test_bit(STRIPE_BIT_DELAY, &sh->state)) { | |
2430 | if (must_compute > 0) { | |
2431 | /* We have failed blocks and need to compute them */ | |
2432 | switch (s->failed) { | |
2433 | case 0: | |
2434 | BUG(); | |
2435 | case 1: | |
2436 | compute_block_1(sh, r6s->failed_num[0], 0); | |
2437 | break; | |
2438 | case 2: | |
2439 | compute_block_2(sh, r6s->failed_num[0], | |
2440 | r6s->failed_num[1]); | |
2441 | break; | |
2442 | default: /* This request should have been failed? */ | |
2443 | BUG(); | |
2444 | } | |
2445 | } | |
2446 | ||
45b4233c | 2447 | pr_debug("Computing parity for stripe %llu\n", |
a4456856 DW |
2448 | (unsigned long long)sh->sector); |
2449 | compute_parity6(sh, RECONSTRUCT_WRITE); | |
2450 | /* now every locked buffer is ready to be written */ | |
2451 | for (i = disks; i--; ) | |
2452 | if (test_bit(R5_LOCKED, &sh->dev[i].flags)) { | |
45b4233c | 2453 | pr_debug("Writing stripe %llu block %d\n", |
a4456856 DW |
2454 | (unsigned long long)sh->sector, i); |
2455 | s->locked++; | |
2456 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
2457 | } | |
2458 | /* after a RECONSTRUCT_WRITE, the stripe MUST be in-sync */ | |
2459 | set_bit(STRIPE_INSYNC, &sh->state); | |
2460 | ||
2461 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
2462 | atomic_dec(&conf->preread_active_stripes); | |
2463 | if (atomic_read(&conf->preread_active_stripes) < | |
2464 | IO_THRESHOLD) | |
2465 | md_wakeup_thread(conf->mddev->thread); | |
2466 | } | |
2467 | } | |
2468 | } | |
2469 | ||
2470 | static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, | |
2471 | struct stripe_head_state *s, int disks) | |
2472 | { | |
2473 | set_bit(STRIPE_HANDLE, &sh->state); | |
2474 | if (s->failed == 0) { | |
2475 | BUG_ON(s->uptodate != disks); | |
2476 | compute_parity5(sh, CHECK_PARITY); | |
2477 | s->uptodate--; | |
2478 | if (page_is_zero(sh->dev[sh->pd_idx].page)) { | |
2479 | /* parity is correct (on disc, not in buffer any more) | |
2480 | */ | |
2481 | set_bit(STRIPE_INSYNC, &sh->state); | |
2482 | } else { | |
2483 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2484 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2485 | /* don't try to repair!! */ | |
2486 | set_bit(STRIPE_INSYNC, &sh->state); | |
2487 | else { | |
2488 | compute_block(sh, sh->pd_idx); | |
2489 | s->uptodate++; | |
2490 | } | |
2491 | } | |
2492 | } | |
2493 | if (!test_bit(STRIPE_INSYNC, &sh->state)) { | |
2494 | struct r5dev *dev; | |
2495 | /* either failed parity check, or recovery is happening */ | |
2496 | if (s->failed == 0) | |
2497 | s->failed_num = sh->pd_idx; | |
2498 | dev = &sh->dev[s->failed_num]; | |
2499 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); | |
2500 | BUG_ON(s->uptodate != disks); | |
2501 | ||
2502 | set_bit(R5_LOCKED, &dev->flags); | |
2503 | set_bit(R5_Wantwrite, &dev->flags); | |
2504 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
2505 | s->locked++; | |
2506 | set_bit(STRIPE_INSYNC, &sh->state); | |
2507 | } | |
2508 | } | |
2509 | ||
2510 | ||
2511 | static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, | |
2512 | struct stripe_head_state *s, | |
2513 | struct r6_state *r6s, struct page *tmp_page, | |
2514 | int disks) | |
2515 | { | |
2516 | int update_p = 0, update_q = 0; | |
2517 | struct r5dev *dev; | |
2518 | int pd_idx = sh->pd_idx; | |
2519 | int qd_idx = r6s->qd_idx; | |
2520 | ||
2521 | set_bit(STRIPE_HANDLE, &sh->state); | |
2522 | ||
2523 | BUG_ON(s->failed > 2); | |
2524 | BUG_ON(s->uptodate < disks); | |
2525 | /* Want to check and possibly repair P and Q. | |
2526 | * However there could be one 'failed' device, in which | |
2527 | * case we can only check one of them, possibly using the | |
2528 | * other to generate missing data | |
2529 | */ | |
2530 | ||
2531 | /* If !tmp_page, we cannot do the calculations, | |
2532 | * but as we have set STRIPE_HANDLE, we will soon be called | |
2533 | * by stripe_handle with a tmp_page - just wait until then. | |
2534 | */ | |
2535 | if (tmp_page) { | |
2536 | if (s->failed == r6s->q_failed) { | |
2537 | /* The only possible failed device holds 'Q', so it | |
2538 | * makes sense to check P (If anything else were failed, | |
2539 | * we would have used P to recreate it). | |
2540 | */ | |
2541 | compute_block_1(sh, pd_idx, 1); | |
2542 | if (!page_is_zero(sh->dev[pd_idx].page)) { | |
2543 | compute_block_1(sh, pd_idx, 0); | |
2544 | update_p = 1; | |
2545 | } | |
2546 | } | |
2547 | if (!r6s->q_failed && s->failed < 2) { | |
2548 | /* q is not failed, and we didn't use it to generate | |
2549 | * anything, so it makes sense to check it | |
2550 | */ | |
2551 | memcpy(page_address(tmp_page), | |
2552 | page_address(sh->dev[qd_idx].page), | |
2553 | STRIPE_SIZE); | |
2554 | compute_parity6(sh, UPDATE_PARITY); | |
2555 | if (memcmp(page_address(tmp_page), | |
2556 | page_address(sh->dev[qd_idx].page), | |
2557 | STRIPE_SIZE) != 0) { | |
2558 | clear_bit(STRIPE_INSYNC, &sh->state); | |
2559 | update_q = 1; | |
2560 | } | |
2561 | } | |
2562 | if (update_p || update_q) { | |
2563 | conf->mddev->resync_mismatches += STRIPE_SECTORS; | |
2564 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) | |
2565 | /* don't try to repair!! */ | |
2566 | update_p = update_q = 0; | |
2567 | } | |
2568 | ||
2569 | /* now write out any block on a failed drive, | |
2570 | * or P or Q if they need it | |
2571 | */ | |
2572 | ||
2573 | if (s->failed == 2) { | |
2574 | dev = &sh->dev[r6s->failed_num[1]]; | |
2575 | s->locked++; | |
2576 | set_bit(R5_LOCKED, &dev->flags); | |
2577 | set_bit(R5_Wantwrite, &dev->flags); | |
2578 | } | |
2579 | if (s->failed >= 1) { | |
2580 | dev = &sh->dev[r6s->failed_num[0]]; | |
2581 | s->locked++; | |
2582 | set_bit(R5_LOCKED, &dev->flags); | |
2583 | set_bit(R5_Wantwrite, &dev->flags); | |
2584 | } | |
2585 | ||
2586 | if (update_p) { | |
2587 | dev = &sh->dev[pd_idx]; | |
2588 | s->locked++; | |
2589 | set_bit(R5_LOCKED, &dev->flags); | |
2590 | set_bit(R5_Wantwrite, &dev->flags); | |
2591 | } | |
2592 | if (update_q) { | |
2593 | dev = &sh->dev[qd_idx]; | |
2594 | s->locked++; | |
2595 | set_bit(R5_LOCKED, &dev->flags); | |
2596 | set_bit(R5_Wantwrite, &dev->flags); | |
2597 | } | |
2598 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
2599 | ||
2600 | set_bit(STRIPE_INSYNC, &sh->state); | |
2601 | } | |
2602 | } | |
2603 | ||
2604 | static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, | |
2605 | struct r6_state *r6s) | |
2606 | { | |
2607 | int i; | |
2608 | ||
2609 | /* We have read all the blocks in this stripe and now we need to | |
2610 | * copy some of them into a target stripe for expand. | |
2611 | */ | |
2612 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
2613 | for (i = 0; i < sh->disks; i++) | |
2614 | if (i != sh->pd_idx && (r6s && i != r6s->qd_idx)) { | |
2615 | int dd_idx, pd_idx, j; | |
2616 | struct stripe_head *sh2; | |
2617 | ||
2618 | sector_t bn = compute_blocknr(sh, i); | |
2619 | sector_t s = raid5_compute_sector(bn, conf->raid_disks, | |
2620 | conf->raid_disks - | |
2621 | conf->max_degraded, &dd_idx, | |
2622 | &pd_idx, conf); | |
2623 | sh2 = get_active_stripe(conf, s, conf->raid_disks, | |
2624 | pd_idx, 1); | |
2625 | if (sh2 == NULL) | |
2626 | /* so far only the early blocks of this stripe | |
2627 | * have been requested. When later blocks | |
2628 | * get requested, we will try again | |
2629 | */ | |
2630 | continue; | |
2631 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
2632 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
2633 | /* must have already done this block */ | |
2634 | release_stripe(sh2); | |
2635 | continue; | |
2636 | } | |
2637 | memcpy(page_address(sh2->dev[dd_idx].page), | |
2638 | page_address(sh->dev[i].page), | |
2639 | STRIPE_SIZE); | |
2640 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); | |
2641 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
2642 | for (j = 0; j < conf->raid_disks; j++) | |
2643 | if (j != sh2->pd_idx && | |
2644 | (r6s && j != r6s->qd_idx) && | |
2645 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) | |
2646 | break; | |
2647 | if (j == conf->raid_disks) { | |
2648 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
2649 | set_bit(STRIPE_HANDLE, &sh2->state); | |
2650 | } | |
2651 | release_stripe(sh2); | |
2652 | } | |
2653 | } | |
1da177e4 LT |
2654 | |
2655 | /* | |
2656 | * handle_stripe - do things to a stripe. | |
2657 | * | |
2658 | * We lock the stripe and then examine the state of various bits | |
2659 | * to see what needs to be done. | |
2660 | * Possible results: | |
2661 | * return some read request which now have data | |
2662 | * return some write requests which are safely on disc | |
2663 | * schedule a read on some buffers | |
2664 | * schedule a write of some buffers | |
2665 | * return confirmation of parity correctness | |
2666 | * | |
1da177e4 LT |
2667 | * buffers are taken off read_list or write_list, and bh_cache buffers |
2668 | * get BH_Lock set before the stripe lock is released. | |
2669 | * | |
2670 | */ | |
a4456856 | 2671 | |
16a53ecc | 2672 | static void handle_stripe5(struct stripe_head *sh) |
1da177e4 LT |
2673 | { |
2674 | raid5_conf_t *conf = sh->raid_conf; | |
a4456856 DW |
2675 | int disks = sh->disks, i; |
2676 | struct bio *return_bi = NULL; | |
2677 | struct stripe_head_state s; | |
1da177e4 | 2678 | struct r5dev *dev; |
d84e0f10 | 2679 | unsigned long pending = 0; |
1da177e4 | 2680 | |
a4456856 | 2681 | memset(&s, 0, sizeof(s)); |
d84e0f10 DW |
2682 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, pd_idx=%d " |
2683 | "ops=%lx:%lx:%lx\n", (unsigned long long)sh->sector, sh->state, | |
2684 | atomic_read(&sh->count), sh->pd_idx, | |
2685 | sh->ops.pending, sh->ops.ack, sh->ops.complete); | |
1da177e4 LT |
2686 | |
2687 | spin_lock(&sh->lock); | |
2688 | clear_bit(STRIPE_HANDLE, &sh->state); | |
2689 | clear_bit(STRIPE_DELAYED, &sh->state); | |
2690 | ||
a4456856 DW |
2691 | s.syncing = test_bit(STRIPE_SYNCING, &sh->state); |
2692 | s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
2693 | s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
1da177e4 LT |
2694 | /* Now to look around and see what can be done */ |
2695 | ||
9910f16a | 2696 | rcu_read_lock(); |
1da177e4 LT |
2697 | for (i=disks; i--; ) { |
2698 | mdk_rdev_t *rdev; | |
a4456856 | 2699 | struct r5dev *dev = &sh->dev[i]; |
1da177e4 | 2700 | clear_bit(R5_Insync, &dev->flags); |
1da177e4 | 2701 | |
45b4233c | 2702 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
1da177e4 LT |
2703 | i, dev->flags, dev->toread, dev->towrite, dev->written); |
2704 | /* maybe we can reply to a read */ | |
2705 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread) { | |
2706 | struct bio *rbi, *rbi2; | |
45b4233c | 2707 | pr_debug("Return read for disc %d\n", i); |
1da177e4 LT |
2708 | spin_lock_irq(&conf->device_lock); |
2709 | rbi = dev->toread; | |
2710 | dev->toread = NULL; | |
2711 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
2712 | wake_up(&conf->wait_for_overlap); | |
2713 | spin_unlock_irq(&conf->device_lock); | |
2714 | while (rbi && rbi->bi_sector < dev->sector + STRIPE_SECTORS) { | |
2715 | copy_data(0, rbi, dev->page, dev->sector); | |
2716 | rbi2 = r5_next_bio(rbi, dev->sector); | |
2717 | spin_lock_irq(&conf->device_lock); | |
2718 | if (--rbi->bi_phys_segments == 0) { | |
2719 | rbi->bi_next = return_bi; | |
2720 | return_bi = rbi; | |
2721 | } | |
2722 | spin_unlock_irq(&conf->device_lock); | |
2723 | rbi = rbi2; | |
2724 | } | |
2725 | } | |
2726 | ||
2727 | /* now count some things */ | |
a4456856 DW |
2728 | if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; |
2729 | if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; | |
f38e1219 | 2730 | if (test_bit(R5_Wantcompute, &dev->flags)) s.compute++; |
1da177e4 | 2731 | |
a4456856 DW |
2732 | if (dev->toread) |
2733 | s.to_read++; | |
1da177e4 | 2734 | if (dev->towrite) { |
a4456856 | 2735 | s.to_write++; |
1da177e4 | 2736 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
a4456856 | 2737 | s.non_overwrite++; |
1da177e4 | 2738 | } |
a4456856 DW |
2739 | if (dev->written) |
2740 | s.written++; | |
9910f16a | 2741 | rdev = rcu_dereference(conf->disks[i].rdev); |
b2d444d7 | 2742 | if (!rdev || !test_bit(In_sync, &rdev->flags)) { |
14f8d26b | 2743 | /* The ReadError flag will just be confusing now */ |
4e5314b5 N |
2744 | clear_bit(R5_ReadError, &dev->flags); |
2745 | clear_bit(R5_ReWrite, &dev->flags); | |
2746 | } | |
b2d444d7 | 2747 | if (!rdev || !test_bit(In_sync, &rdev->flags) |
4e5314b5 | 2748 | || test_bit(R5_ReadError, &dev->flags)) { |
a4456856 DW |
2749 | s.failed++; |
2750 | s.failed_num = i; | |
1da177e4 LT |
2751 | } else |
2752 | set_bit(R5_Insync, &dev->flags); | |
2753 | } | |
9910f16a | 2754 | rcu_read_unlock(); |
45b4233c | 2755 | pr_debug("locked=%d uptodate=%d to_read=%d" |
1da177e4 | 2756 | " to_write=%d failed=%d failed_num=%d\n", |
a4456856 DW |
2757 | s.locked, s.uptodate, s.to_read, s.to_write, |
2758 | s.failed, s.failed_num); | |
1da177e4 LT |
2759 | /* check if the array has lost two devices and, if so, some requests might |
2760 | * need to be failed | |
2761 | */ | |
a4456856 DW |
2762 | if (s.failed > 1 && s.to_read+s.to_write+s.written) |
2763 | handle_requests_to_failed_array(conf, sh, &s, disks, | |
2764 | &return_bi); | |
2765 | if (s.failed > 1 && s.syncing) { | |
1da177e4 LT |
2766 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
2767 | clear_bit(STRIPE_SYNCING, &sh->state); | |
a4456856 | 2768 | s.syncing = 0; |
1da177e4 LT |
2769 | } |
2770 | ||
2771 | /* might be able to return some write requests if the parity block | |
2772 | * is safe, or on a failed drive | |
2773 | */ | |
2774 | dev = &sh->dev[sh->pd_idx]; | |
a4456856 DW |
2775 | if ( s.written && |
2776 | ((test_bit(R5_Insync, &dev->flags) && | |
2777 | !test_bit(R5_LOCKED, &dev->flags) && | |
2778 | test_bit(R5_UPTODATE, &dev->flags)) || | |
2779 | (s.failed == 1 && s.failed_num == sh->pd_idx))) | |
2780 | handle_completed_write_requests(conf, sh, disks, &return_bi); | |
1da177e4 LT |
2781 | |
2782 | /* Now we might consider reading some blocks, either to check/generate | |
2783 | * parity, or to satisfy requests | |
2784 | * or to load a block that is being partially written. | |
2785 | */ | |
a4456856 | 2786 | if (s.to_read || s.non_overwrite || |
f38e1219 DW |
2787 | (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding || |
2788 | test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending)) | |
a4456856 | 2789 | handle_issuing_new_read_requests5(sh, &s, disks); |
1da177e4 | 2790 | |
e33129d8 DW |
2791 | /* Now we check to see if any write operations have recently |
2792 | * completed | |
2793 | */ | |
2794 | ||
2795 | /* leave prexor set until postxor is done, allows us to distinguish | |
2796 | * a rmw from a rcw during biodrain | |
2797 | */ | |
2798 | if (test_bit(STRIPE_OP_PREXOR, &sh->ops.complete) && | |
2799 | test_bit(STRIPE_OP_POSTXOR, &sh->ops.complete)) { | |
2800 | ||
2801 | clear_bit(STRIPE_OP_PREXOR, &sh->ops.complete); | |
2802 | clear_bit(STRIPE_OP_PREXOR, &sh->ops.ack); | |
2803 | clear_bit(STRIPE_OP_PREXOR, &sh->ops.pending); | |
2804 | ||
2805 | for (i = disks; i--; ) | |
2806 | clear_bit(R5_Wantprexor, &sh->dev[i].flags); | |
2807 | } | |
2808 | ||
2809 | /* if only POSTXOR is set then this is an 'expand' postxor */ | |
2810 | if (test_bit(STRIPE_OP_BIODRAIN, &sh->ops.complete) && | |
2811 | test_bit(STRIPE_OP_POSTXOR, &sh->ops.complete)) { | |
2812 | ||
2813 | clear_bit(STRIPE_OP_BIODRAIN, &sh->ops.complete); | |
2814 | clear_bit(STRIPE_OP_BIODRAIN, &sh->ops.ack); | |
2815 | clear_bit(STRIPE_OP_BIODRAIN, &sh->ops.pending); | |
2816 | ||
2817 | clear_bit(STRIPE_OP_POSTXOR, &sh->ops.complete); | |
2818 | clear_bit(STRIPE_OP_POSTXOR, &sh->ops.ack); | |
2819 | clear_bit(STRIPE_OP_POSTXOR, &sh->ops.pending); | |
2820 | ||
2821 | /* All the 'written' buffers and the parity block are ready to | |
2822 | * be written back to disk | |
2823 | */ | |
2824 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags)); | |
2825 | for (i = disks; i--; ) { | |
2826 | dev = &sh->dev[i]; | |
2827 | if (test_bit(R5_LOCKED, &dev->flags) && | |
2828 | (i == sh->pd_idx || dev->written)) { | |
2829 | pr_debug("Writing block %d\n", i); | |
2830 | set_bit(R5_Wantwrite, &dev->flags); | |
2831 | if (!test_and_set_bit( | |
2832 | STRIPE_OP_IO, &sh->ops.pending)) | |
2833 | sh->ops.count++; | |
2834 | if (!test_bit(R5_Insync, &dev->flags) || | |
2835 | (i == sh->pd_idx && s.failed == 0)) | |
2836 | set_bit(STRIPE_INSYNC, &sh->state); | |
2837 | } | |
2838 | } | |
2839 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { | |
2840 | atomic_dec(&conf->preread_active_stripes); | |
2841 | if (atomic_read(&conf->preread_active_stripes) < | |
2842 | IO_THRESHOLD) | |
2843 | md_wakeup_thread(conf->mddev->thread); | |
2844 | } | |
2845 | } | |
2846 | ||
2847 | /* Now to consider new write requests and what else, if anything | |
2848 | * should be read. We do not handle new writes when: | |
2849 | * 1/ A 'write' operation (copy+xor) is already in flight. | |
2850 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
2851 | * block. | |
2852 | */ | |
2853 | if (s.to_write && !test_bit(STRIPE_OP_POSTXOR, &sh->ops.pending) && | |
2854 | !test_bit(STRIPE_OP_CHECK, &sh->ops.pending)) | |
a4456856 | 2855 | handle_issuing_new_write_requests5(conf, sh, &s, disks); |
1da177e4 LT |
2856 | |
2857 | /* maybe we need to check and possibly fix the parity for this stripe | |
2858 | * Any reads will already have been scheduled, so we just see if enough data | |
2859 | * is available | |
2860 | */ | |
a4456856 DW |
2861 | if (s.syncing && s.locked == 0 && |
2862 | !test_bit(STRIPE_INSYNC, &sh->state)) | |
2863 | handle_parity_checks5(conf, sh, &s, disks); | |
2864 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { | |
1da177e4 LT |
2865 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
2866 | clear_bit(STRIPE_SYNCING, &sh->state); | |
2867 | } | |
4e5314b5 N |
2868 | |
2869 | /* If the failed drive is just a ReadError, then we might need to progress | |
2870 | * the repair/check process | |
2871 | */ | |
a4456856 DW |
2872 | if (s.failed == 1 && !conf->mddev->ro && |
2873 | test_bit(R5_ReadError, &sh->dev[s.failed_num].flags) | |
2874 | && !test_bit(R5_LOCKED, &sh->dev[s.failed_num].flags) | |
2875 | && test_bit(R5_UPTODATE, &sh->dev[s.failed_num].flags) | |
4e5314b5 | 2876 | ) { |
a4456856 | 2877 | dev = &sh->dev[s.failed_num]; |
4e5314b5 N |
2878 | if (!test_bit(R5_ReWrite, &dev->flags)) { |
2879 | set_bit(R5_Wantwrite, &dev->flags); | |
2880 | set_bit(R5_ReWrite, &dev->flags); | |
2881 | set_bit(R5_LOCKED, &dev->flags); | |
a4456856 | 2882 | s.locked++; |
4e5314b5 N |
2883 | } else { |
2884 | /* let's read it back */ | |
2885 | set_bit(R5_Wantread, &dev->flags); | |
2886 | set_bit(R5_LOCKED, &dev->flags); | |
a4456856 | 2887 | s.locked++; |
4e5314b5 N |
2888 | } |
2889 | } | |
2890 | ||
a4456856 | 2891 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state)) { |
ccfcc3c1 N |
2892 | /* Need to write out all blocks after computing parity */ |
2893 | sh->disks = conf->raid_disks; | |
2894 | sh->pd_idx = stripe_to_pdidx(sh->sector, conf, conf->raid_disks); | |
16a53ecc | 2895 | compute_parity5(sh, RECONSTRUCT_WRITE); |
a4456856 | 2896 | for (i = conf->raid_disks; i--; ) { |
ccfcc3c1 | 2897 | set_bit(R5_LOCKED, &sh->dev[i].flags); |
a4456856 | 2898 | s.locked++; |
ccfcc3c1 N |
2899 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
2900 | } | |
2901 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
a4456856 | 2902 | } else if (s.expanded) { |
ccfcc3c1 | 2903 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
f6705578 | 2904 | atomic_dec(&conf->reshape_stripes); |
ccfcc3c1 N |
2905 | wake_up(&conf->wait_for_overlap); |
2906 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
2907 | } | |
2908 | ||
a4456856 DW |
2909 | if (s.expanding && s.locked == 0) |
2910 | handle_stripe_expansion(conf, sh, NULL); | |
ccfcc3c1 | 2911 | |
d84e0f10 DW |
2912 | if (sh->ops.count) |
2913 | pending = get_stripe_work(sh); | |
2914 | ||
1da177e4 LT |
2915 | spin_unlock(&sh->lock); |
2916 | ||
d84e0f10 DW |
2917 | if (pending) |
2918 | raid5_run_ops(sh, pending); | |
2919 | ||
a4456856 | 2920 | return_io(return_bi); |
1da177e4 | 2921 | |
1da177e4 LT |
2922 | for (i=disks; i-- ;) { |
2923 | int rw; | |
2924 | struct bio *bi; | |
2925 | mdk_rdev_t *rdev; | |
2926 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) | |
802ba064 | 2927 | rw = WRITE; |
1da177e4 | 2928 | else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) |
802ba064 | 2929 | rw = READ; |
1da177e4 LT |
2930 | else |
2931 | continue; | |
2932 | ||
2933 | bi = &sh->dev[i].req; | |
2934 | ||
2935 | bi->bi_rw = rw; | |
802ba064 | 2936 | if (rw == WRITE) |
1da177e4 LT |
2937 | bi->bi_end_io = raid5_end_write_request; |
2938 | else | |
2939 | bi->bi_end_io = raid5_end_read_request; | |
2940 | ||
2941 | rcu_read_lock(); | |
d6065f7b | 2942 | rdev = rcu_dereference(conf->disks[i].rdev); |
b2d444d7 | 2943 | if (rdev && test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2944 | rdev = NULL; |
2945 | if (rdev) | |
2946 | atomic_inc(&rdev->nr_pending); | |
2947 | rcu_read_unlock(); | |
2948 | ||
2949 | if (rdev) { | |
a4456856 | 2950 | if (s.syncing || s.expanding || s.expanded) |
1da177e4 LT |
2951 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
2952 | ||
2953 | bi->bi_bdev = rdev->bdev; | |
45b4233c | 2954 | pr_debug("for %llu schedule op %ld on disc %d\n", |
1da177e4 LT |
2955 | (unsigned long long)sh->sector, bi->bi_rw, i); |
2956 | atomic_inc(&sh->count); | |
2957 | bi->bi_sector = sh->sector + rdev->data_offset; | |
2958 | bi->bi_flags = 1 << BIO_UPTODATE; | |
2959 | bi->bi_vcnt = 1; | |
2960 | bi->bi_max_vecs = 1; | |
2961 | bi->bi_idx = 0; | |
2962 | bi->bi_io_vec = &sh->dev[i].vec; | |
2963 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; | |
2964 | bi->bi_io_vec[0].bv_offset = 0; | |
2965 | bi->bi_size = STRIPE_SIZE; | |
2966 | bi->bi_next = NULL; | |
4dbcdc75 N |
2967 | if (rw == WRITE && |
2968 | test_bit(R5_ReWrite, &sh->dev[i].flags)) | |
2969 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); | |
1da177e4 LT |
2970 | generic_make_request(bi); |
2971 | } else { | |
802ba064 | 2972 | if (rw == WRITE) |
72626685 | 2973 | set_bit(STRIPE_DEGRADED, &sh->state); |
45b4233c | 2974 | pr_debug("skip op %ld on disc %d for sector %llu\n", |
1da177e4 LT |
2975 | bi->bi_rw, i, (unsigned long long)sh->sector); |
2976 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
2977 | set_bit(STRIPE_HANDLE, &sh->state); | |
2978 | } | |
2979 | } | |
2980 | } | |
2981 | ||
16a53ecc | 2982 | static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page) |
1da177e4 | 2983 | { |
16a53ecc | 2984 | raid6_conf_t *conf = sh->raid_conf; |
f416885e | 2985 | int disks = sh->disks; |
a4456856 DW |
2986 | struct bio *return_bi = NULL; |
2987 | int i, pd_idx = sh->pd_idx; | |
2988 | struct stripe_head_state s; | |
2989 | struct r6_state r6s; | |
16a53ecc | 2990 | struct r5dev *dev, *pdev, *qdev; |
1da177e4 | 2991 | |
a4456856 | 2992 | r6s.qd_idx = raid6_next_disk(pd_idx, disks); |
45b4233c | 2993 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " |
a4456856 DW |
2994 | "pd_idx=%d, qd_idx=%d\n", |
2995 | (unsigned long long)sh->sector, sh->state, | |
2996 | atomic_read(&sh->count), pd_idx, r6s.qd_idx); | |
2997 | memset(&s, 0, sizeof(s)); | |
72626685 | 2998 | |
16a53ecc N |
2999 | spin_lock(&sh->lock); |
3000 | clear_bit(STRIPE_HANDLE, &sh->state); | |
3001 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3002 | ||
a4456856 DW |
3003 | s.syncing = test_bit(STRIPE_SYNCING, &sh->state); |
3004 | s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
3005 | s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
16a53ecc | 3006 | /* Now to look around and see what can be done */ |
1da177e4 LT |
3007 | |
3008 | rcu_read_lock(); | |
16a53ecc N |
3009 | for (i=disks; i--; ) { |
3010 | mdk_rdev_t *rdev; | |
3011 | dev = &sh->dev[i]; | |
3012 | clear_bit(R5_Insync, &dev->flags); | |
1da177e4 | 3013 | |
45b4233c | 3014 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
16a53ecc N |
3015 | i, dev->flags, dev->toread, dev->towrite, dev->written); |
3016 | /* maybe we can reply to a read */ | |
3017 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread) { | |
3018 | struct bio *rbi, *rbi2; | |
45b4233c | 3019 | pr_debug("Return read for disc %d\n", i); |
16a53ecc N |
3020 | spin_lock_irq(&conf->device_lock); |
3021 | rbi = dev->toread; | |
3022 | dev->toread = NULL; | |
3023 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
3024 | wake_up(&conf->wait_for_overlap); | |
3025 | spin_unlock_irq(&conf->device_lock); | |
3026 | while (rbi && rbi->bi_sector < dev->sector + STRIPE_SECTORS) { | |
3027 | copy_data(0, rbi, dev->page, dev->sector); | |
3028 | rbi2 = r5_next_bio(rbi, dev->sector); | |
3029 | spin_lock_irq(&conf->device_lock); | |
3030 | if (--rbi->bi_phys_segments == 0) { | |
3031 | rbi->bi_next = return_bi; | |
3032 | return_bi = rbi; | |
3033 | } | |
3034 | spin_unlock_irq(&conf->device_lock); | |
3035 | rbi = rbi2; | |
3036 | } | |
3037 | } | |
1da177e4 | 3038 | |
16a53ecc | 3039 | /* now count some things */ |
a4456856 DW |
3040 | if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; |
3041 | if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; | |
1da177e4 | 3042 | |
16a53ecc | 3043 | |
a4456856 DW |
3044 | if (dev->toread) |
3045 | s.to_read++; | |
16a53ecc | 3046 | if (dev->towrite) { |
a4456856 | 3047 | s.to_write++; |
16a53ecc | 3048 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
a4456856 | 3049 | s.non_overwrite++; |
16a53ecc | 3050 | } |
a4456856 DW |
3051 | if (dev->written) |
3052 | s.written++; | |
16a53ecc N |
3053 | rdev = rcu_dereference(conf->disks[i].rdev); |
3054 | if (!rdev || !test_bit(In_sync, &rdev->flags)) { | |
3055 | /* The ReadError flag will just be confusing now */ | |
3056 | clear_bit(R5_ReadError, &dev->flags); | |
3057 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 3058 | } |
16a53ecc N |
3059 | if (!rdev || !test_bit(In_sync, &rdev->flags) |
3060 | || test_bit(R5_ReadError, &dev->flags)) { | |
a4456856 DW |
3061 | if (s.failed < 2) |
3062 | r6s.failed_num[s.failed] = i; | |
3063 | s.failed++; | |
16a53ecc N |
3064 | } else |
3065 | set_bit(R5_Insync, &dev->flags); | |
1da177e4 LT |
3066 | } |
3067 | rcu_read_unlock(); | |
45b4233c | 3068 | pr_debug("locked=%d uptodate=%d to_read=%d" |
16a53ecc | 3069 | " to_write=%d failed=%d failed_num=%d,%d\n", |
a4456856 DW |
3070 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, |
3071 | r6s.failed_num[0], r6s.failed_num[1]); | |
3072 | /* check if the array has lost >2 devices and, if so, some requests | |
3073 | * might need to be failed | |
16a53ecc | 3074 | */ |
a4456856 DW |
3075 | if (s.failed > 2 && s.to_read+s.to_write+s.written) |
3076 | handle_requests_to_failed_array(conf, sh, &s, disks, | |
3077 | &return_bi); | |
3078 | if (s.failed > 2 && s.syncing) { | |
16a53ecc N |
3079 | md_done_sync(conf->mddev, STRIPE_SECTORS,0); |
3080 | clear_bit(STRIPE_SYNCING, &sh->state); | |
a4456856 | 3081 | s.syncing = 0; |
16a53ecc N |
3082 | } |
3083 | ||
3084 | /* | |
3085 | * might be able to return some write requests if the parity blocks | |
3086 | * are safe, or on a failed drive | |
3087 | */ | |
3088 | pdev = &sh->dev[pd_idx]; | |
a4456856 DW |
3089 | r6s.p_failed = (s.failed >= 1 && r6s.failed_num[0] == pd_idx) |
3090 | || (s.failed >= 2 && r6s.failed_num[1] == pd_idx); | |
3091 | qdev = &sh->dev[r6s.qd_idx]; | |
3092 | r6s.q_failed = (s.failed >= 1 && r6s.failed_num[0] == r6s.qd_idx) | |
3093 | || (s.failed >= 2 && r6s.failed_num[1] == r6s.qd_idx); | |
3094 | ||
3095 | if ( s.written && | |
3096 | ( r6s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
16a53ecc | 3097 | && !test_bit(R5_LOCKED, &pdev->flags) |
a4456856 DW |
3098 | && test_bit(R5_UPTODATE, &pdev->flags)))) && |
3099 | ( r6s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
16a53ecc | 3100 | && !test_bit(R5_LOCKED, &qdev->flags) |
a4456856 DW |
3101 | && test_bit(R5_UPTODATE, &qdev->flags))))) |
3102 | handle_completed_write_requests(conf, sh, disks, &return_bi); | |
16a53ecc N |
3103 | |
3104 | /* Now we might consider reading some blocks, either to check/generate | |
3105 | * parity, or to satisfy requests | |
3106 | * or to load a block that is being partially written. | |
3107 | */ | |
a4456856 DW |
3108 | if (s.to_read || s.non_overwrite || (s.to_write && s.failed) || |
3109 | (s.syncing && (s.uptodate < disks)) || s.expanding) | |
3110 | handle_issuing_new_read_requests6(sh, &s, &r6s, disks); | |
16a53ecc N |
3111 | |
3112 | /* now to consider writing and what else, if anything should be read */ | |
a4456856 DW |
3113 | if (s.to_write) |
3114 | handle_issuing_new_write_requests6(conf, sh, &s, &r6s, disks); | |
16a53ecc N |
3115 | |
3116 | /* maybe we need to check and possibly fix the parity for this stripe | |
a4456856 DW |
3117 | * Any reads will already have been scheduled, so we just see if enough |
3118 | * data is available | |
16a53ecc | 3119 | */ |
a4456856 DW |
3120 | if (s.syncing && s.locked == 0 && !test_bit(STRIPE_INSYNC, &sh->state)) |
3121 | handle_parity_checks6(conf, sh, &s, &r6s, tmp_page, disks); | |
16a53ecc | 3122 | |
a4456856 | 3123 | if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { |
16a53ecc N |
3124 | md_done_sync(conf->mddev, STRIPE_SECTORS,1); |
3125 | clear_bit(STRIPE_SYNCING, &sh->state); | |
3126 | } | |
3127 | ||
3128 | /* If the failed drives are just a ReadError, then we might need | |
3129 | * to progress the repair/check process | |
3130 | */ | |
a4456856 DW |
3131 | if (s.failed <= 2 && !conf->mddev->ro) |
3132 | for (i = 0; i < s.failed; i++) { | |
3133 | dev = &sh->dev[r6s.failed_num[i]]; | |
16a53ecc N |
3134 | if (test_bit(R5_ReadError, &dev->flags) |
3135 | && !test_bit(R5_LOCKED, &dev->flags) | |
3136 | && test_bit(R5_UPTODATE, &dev->flags) | |
3137 | ) { | |
3138 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
3139 | set_bit(R5_Wantwrite, &dev->flags); | |
3140 | set_bit(R5_ReWrite, &dev->flags); | |
3141 | set_bit(R5_LOCKED, &dev->flags); | |
3142 | } else { | |
3143 | /* let's read it back */ | |
3144 | set_bit(R5_Wantread, &dev->flags); | |
3145 | set_bit(R5_LOCKED, &dev->flags); | |
3146 | } | |
3147 | } | |
3148 | } | |
f416885e | 3149 | |
a4456856 | 3150 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state)) { |
f416885e N |
3151 | /* Need to write out all blocks after computing P&Q */ |
3152 | sh->disks = conf->raid_disks; | |
3153 | sh->pd_idx = stripe_to_pdidx(sh->sector, conf, | |
3154 | conf->raid_disks); | |
3155 | compute_parity6(sh, RECONSTRUCT_WRITE); | |
3156 | for (i = conf->raid_disks ; i-- ; ) { | |
3157 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 | 3158 | s.locked++; |
f416885e N |
3159 | set_bit(R5_Wantwrite, &sh->dev[i].flags); |
3160 | } | |
3161 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
a4456856 | 3162 | } else if (s.expanded) { |
f416885e N |
3163 | clear_bit(STRIPE_EXPAND_READY, &sh->state); |
3164 | atomic_dec(&conf->reshape_stripes); | |
3165 | wake_up(&conf->wait_for_overlap); | |
3166 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
3167 | } | |
3168 | ||
a4456856 DW |
3169 | if (s.expanding && s.locked == 0) |
3170 | handle_stripe_expansion(conf, sh, &r6s); | |
f416885e | 3171 | |
16a53ecc N |
3172 | spin_unlock(&sh->lock); |
3173 | ||
a4456856 | 3174 | return_io(return_bi); |
16a53ecc | 3175 | |
16a53ecc N |
3176 | for (i=disks; i-- ;) { |
3177 | int rw; | |
3178 | struct bio *bi; | |
3179 | mdk_rdev_t *rdev; | |
3180 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) | |
802ba064 | 3181 | rw = WRITE; |
16a53ecc | 3182 | else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) |
802ba064 | 3183 | rw = READ; |
16a53ecc N |
3184 | else |
3185 | continue; | |
3186 | ||
3187 | bi = &sh->dev[i].req; | |
3188 | ||
3189 | bi->bi_rw = rw; | |
802ba064 | 3190 | if (rw == WRITE) |
16a53ecc N |
3191 | bi->bi_end_io = raid5_end_write_request; |
3192 | else | |
3193 | bi->bi_end_io = raid5_end_read_request; | |
3194 | ||
3195 | rcu_read_lock(); | |
3196 | rdev = rcu_dereference(conf->disks[i].rdev); | |
3197 | if (rdev && test_bit(Faulty, &rdev->flags)) | |
3198 | rdev = NULL; | |
3199 | if (rdev) | |
3200 | atomic_inc(&rdev->nr_pending); | |
3201 | rcu_read_unlock(); | |
3202 | ||
3203 | if (rdev) { | |
a4456856 | 3204 | if (s.syncing || s.expanding || s.expanded) |
16a53ecc N |
3205 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
3206 | ||
3207 | bi->bi_bdev = rdev->bdev; | |
45b4233c | 3208 | pr_debug("for %llu schedule op %ld on disc %d\n", |
16a53ecc N |
3209 | (unsigned long long)sh->sector, bi->bi_rw, i); |
3210 | atomic_inc(&sh->count); | |
3211 | bi->bi_sector = sh->sector + rdev->data_offset; | |
3212 | bi->bi_flags = 1 << BIO_UPTODATE; | |
3213 | bi->bi_vcnt = 1; | |
3214 | bi->bi_max_vecs = 1; | |
3215 | bi->bi_idx = 0; | |
3216 | bi->bi_io_vec = &sh->dev[i].vec; | |
3217 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; | |
3218 | bi->bi_io_vec[0].bv_offset = 0; | |
3219 | bi->bi_size = STRIPE_SIZE; | |
3220 | bi->bi_next = NULL; | |
3221 | if (rw == WRITE && | |
3222 | test_bit(R5_ReWrite, &sh->dev[i].flags)) | |
3223 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); | |
3224 | generic_make_request(bi); | |
3225 | } else { | |
802ba064 | 3226 | if (rw == WRITE) |
16a53ecc | 3227 | set_bit(STRIPE_DEGRADED, &sh->state); |
45b4233c | 3228 | pr_debug("skip op %ld on disc %d for sector %llu\n", |
16a53ecc N |
3229 | bi->bi_rw, i, (unsigned long long)sh->sector); |
3230 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
3231 | set_bit(STRIPE_HANDLE, &sh->state); | |
3232 | } | |
3233 | } | |
3234 | } | |
3235 | ||
3236 | static void handle_stripe(struct stripe_head *sh, struct page *tmp_page) | |
3237 | { | |
3238 | if (sh->raid_conf->level == 6) | |
3239 | handle_stripe6(sh, tmp_page); | |
3240 | else | |
3241 | handle_stripe5(sh); | |
3242 | } | |
3243 | ||
3244 | ||
3245 | ||
3246 | static void raid5_activate_delayed(raid5_conf_t *conf) | |
3247 | { | |
3248 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
3249 | while (!list_empty(&conf->delayed_list)) { | |
3250 | struct list_head *l = conf->delayed_list.next; | |
3251 | struct stripe_head *sh; | |
3252 | sh = list_entry(l, struct stripe_head, lru); | |
3253 | list_del_init(l); | |
3254 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3255 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3256 | atomic_inc(&conf->preread_active_stripes); | |
3257 | list_add_tail(&sh->lru, &conf->handle_list); | |
3258 | } | |
3259 | } | |
3260 | } | |
3261 | ||
3262 | static void activate_bit_delay(raid5_conf_t *conf) | |
3263 | { | |
3264 | /* device_lock is held */ | |
3265 | struct list_head head; | |
3266 | list_add(&head, &conf->bitmap_list); | |
3267 | list_del_init(&conf->bitmap_list); | |
3268 | while (!list_empty(&head)) { | |
3269 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
3270 | list_del_init(&sh->lru); | |
3271 | atomic_inc(&sh->count); | |
3272 | __release_stripe(conf, sh); | |
3273 | } | |
3274 | } | |
3275 | ||
3276 | static void unplug_slaves(mddev_t *mddev) | |
3277 | { | |
3278 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3279 | int i; | |
3280 | ||
3281 | rcu_read_lock(); | |
3282 | for (i=0; i<mddev->raid_disks; i++) { | |
3283 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); | |
3284 | if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { | |
3285 | request_queue_t *r_queue = bdev_get_queue(rdev->bdev); | |
3286 | ||
3287 | atomic_inc(&rdev->nr_pending); | |
3288 | rcu_read_unlock(); | |
3289 | ||
3290 | if (r_queue->unplug_fn) | |
3291 | r_queue->unplug_fn(r_queue); | |
3292 | ||
3293 | rdev_dec_pending(rdev, mddev); | |
3294 | rcu_read_lock(); | |
3295 | } | |
3296 | } | |
3297 | rcu_read_unlock(); | |
3298 | } | |
3299 | ||
3300 | static void raid5_unplug_device(request_queue_t *q) | |
3301 | { | |
3302 | mddev_t *mddev = q->queuedata; | |
3303 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3304 | unsigned long flags; | |
3305 | ||
3306 | spin_lock_irqsave(&conf->device_lock, flags); | |
3307 | ||
3308 | if (blk_remove_plug(q)) { | |
3309 | conf->seq_flush++; | |
3310 | raid5_activate_delayed(conf); | |
72626685 | 3311 | } |
1da177e4 LT |
3312 | md_wakeup_thread(mddev->thread); |
3313 | ||
3314 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3315 | ||
3316 | unplug_slaves(mddev); | |
3317 | } | |
3318 | ||
3319 | static int raid5_issue_flush(request_queue_t *q, struct gendisk *disk, | |
3320 | sector_t *error_sector) | |
3321 | { | |
3322 | mddev_t *mddev = q->queuedata; | |
3323 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3324 | int i, ret = 0; | |
3325 | ||
3326 | rcu_read_lock(); | |
3327 | for (i=0; i<mddev->raid_disks && ret == 0; i++) { | |
d6065f7b | 3328 | mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); |
b2d444d7 | 3329 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
3330 | struct block_device *bdev = rdev->bdev; |
3331 | request_queue_t *r_queue = bdev_get_queue(bdev); | |
3332 | ||
3333 | if (!r_queue->issue_flush_fn) | |
3334 | ret = -EOPNOTSUPP; | |
3335 | else { | |
3336 | atomic_inc(&rdev->nr_pending); | |
3337 | rcu_read_unlock(); | |
3338 | ret = r_queue->issue_flush_fn(r_queue, bdev->bd_disk, | |
3339 | error_sector); | |
3340 | rdev_dec_pending(rdev, mddev); | |
3341 | rcu_read_lock(); | |
3342 | } | |
3343 | } | |
3344 | } | |
3345 | rcu_read_unlock(); | |
3346 | return ret; | |
3347 | } | |
3348 | ||
f022b2fd N |
3349 | static int raid5_congested(void *data, int bits) |
3350 | { | |
3351 | mddev_t *mddev = data; | |
3352 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3353 | ||
3354 | /* No difference between reads and writes. Just check | |
3355 | * how busy the stripe_cache is | |
3356 | */ | |
3357 | if (conf->inactive_blocked) | |
3358 | return 1; | |
3359 | if (conf->quiesce) | |
3360 | return 1; | |
3361 | if (list_empty_careful(&conf->inactive_list)) | |
3362 | return 1; | |
3363 | ||
3364 | return 0; | |
3365 | } | |
3366 | ||
23032a0e RBJ |
3367 | /* We want read requests to align with chunks where possible, |
3368 | * but write requests don't need to. | |
3369 | */ | |
3370 | static int raid5_mergeable_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *biovec) | |
3371 | { | |
3372 | mddev_t *mddev = q->queuedata; | |
3373 | sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev); | |
3374 | int max; | |
3375 | unsigned int chunk_sectors = mddev->chunk_size >> 9; | |
3376 | unsigned int bio_sectors = bio->bi_size >> 9; | |
3377 | ||
802ba064 | 3378 | if (bio_data_dir(bio) == WRITE) |
23032a0e RBJ |
3379 | return biovec->bv_len; /* always allow writes to be mergeable */ |
3380 | ||
3381 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; | |
3382 | if (max < 0) max = 0; | |
3383 | if (max <= biovec->bv_len && bio_sectors == 0) | |
3384 | return biovec->bv_len; | |
3385 | else | |
3386 | return max; | |
3387 | } | |
3388 | ||
f679623f RBJ |
3389 | |
3390 | static int in_chunk_boundary(mddev_t *mddev, struct bio *bio) | |
3391 | { | |
3392 | sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev); | |
3393 | unsigned int chunk_sectors = mddev->chunk_size >> 9; | |
3394 | unsigned int bio_sectors = bio->bi_size >> 9; | |
3395 | ||
3396 | return chunk_sectors >= | |
3397 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
3398 | } | |
3399 | ||
46031f9a RBJ |
3400 | /* |
3401 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
3402 | * later sampled by raid5d. | |
3403 | */ | |
3404 | static void add_bio_to_retry(struct bio *bi,raid5_conf_t *conf) | |
3405 | { | |
3406 | unsigned long flags; | |
3407 | ||
3408 | spin_lock_irqsave(&conf->device_lock, flags); | |
3409 | ||
3410 | bi->bi_next = conf->retry_read_aligned_list; | |
3411 | conf->retry_read_aligned_list = bi; | |
3412 | ||
3413 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
3414 | md_wakeup_thread(conf->mddev->thread); | |
3415 | } | |
3416 | ||
3417 | ||
3418 | static struct bio *remove_bio_from_retry(raid5_conf_t *conf) | |
3419 | { | |
3420 | struct bio *bi; | |
3421 | ||
3422 | bi = conf->retry_read_aligned; | |
3423 | if (bi) { | |
3424 | conf->retry_read_aligned = NULL; | |
3425 | return bi; | |
3426 | } | |
3427 | bi = conf->retry_read_aligned_list; | |
3428 | if(bi) { | |
387bb173 | 3429 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a RBJ |
3430 | bi->bi_next = NULL; |
3431 | bi->bi_phys_segments = 1; /* biased count of active stripes */ | |
3432 | bi->bi_hw_segments = 0; /* count of processed stripes */ | |
3433 | } | |
3434 | ||
3435 | return bi; | |
3436 | } | |
3437 | ||
3438 | ||
f679623f RBJ |
3439 | /* |
3440 | * The "raid5_align_endio" should check if the read succeeded and if it | |
3441 | * did, call bio_endio on the original bio (having bio_put the new bio | |
3442 | * first). | |
3443 | * If the read failed.. | |
3444 | */ | |
46031f9a | 3445 | static int raid5_align_endio(struct bio *bi, unsigned int bytes, int error) |
f679623f RBJ |
3446 | { |
3447 | struct bio* raid_bi = bi->bi_private; | |
46031f9a RBJ |
3448 | mddev_t *mddev; |
3449 | raid5_conf_t *conf; | |
3450 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); | |
3451 | mdk_rdev_t *rdev; | |
3452 | ||
f679623f RBJ |
3453 | if (bi->bi_size) |
3454 | return 1; | |
3455 | bio_put(bi); | |
46031f9a RBJ |
3456 | |
3457 | mddev = raid_bi->bi_bdev->bd_disk->queue->queuedata; | |
3458 | conf = mddev_to_conf(mddev); | |
3459 | rdev = (void*)raid_bi->bi_next; | |
3460 | raid_bi->bi_next = NULL; | |
3461 | ||
3462 | rdev_dec_pending(rdev, conf->mddev); | |
3463 | ||
3464 | if (!error && uptodate) { | |
3465 | bio_endio(raid_bi, bytes, 0); | |
3466 | if (atomic_dec_and_test(&conf->active_aligned_reads)) | |
3467 | wake_up(&conf->wait_for_stripe); | |
3468 | return 0; | |
3469 | } | |
3470 | ||
3471 | ||
45b4233c | 3472 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
3473 | |
3474 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
3475 | return 0; |
3476 | } | |
3477 | ||
387bb173 NB |
3478 | static int bio_fits_rdev(struct bio *bi) |
3479 | { | |
3480 | request_queue_t *q = bdev_get_queue(bi->bi_bdev); | |
3481 | ||
3482 | if ((bi->bi_size>>9) > q->max_sectors) | |
3483 | return 0; | |
3484 | blk_recount_segments(q, bi); | |
3485 | if (bi->bi_phys_segments > q->max_phys_segments || | |
3486 | bi->bi_hw_segments > q->max_hw_segments) | |
3487 | return 0; | |
3488 | ||
3489 | if (q->merge_bvec_fn) | |
3490 | /* it's too hard to apply the merge_bvec_fn at this stage, | |
3491 | * just just give up | |
3492 | */ | |
3493 | return 0; | |
3494 | ||
3495 | return 1; | |
3496 | } | |
3497 | ||
3498 | ||
f679623f RBJ |
3499 | static int chunk_aligned_read(request_queue_t *q, struct bio * raid_bio) |
3500 | { | |
3501 | mddev_t *mddev = q->queuedata; | |
3502 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
3503 | const unsigned int raid_disks = conf->raid_disks; | |
46031f9a | 3504 | const unsigned int data_disks = raid_disks - conf->max_degraded; |
f679623f RBJ |
3505 | unsigned int dd_idx, pd_idx; |
3506 | struct bio* align_bi; | |
3507 | mdk_rdev_t *rdev; | |
3508 | ||
3509 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
45b4233c | 3510 | pr_debug("chunk_aligned_read : non aligned\n"); |
f679623f RBJ |
3511 | return 0; |
3512 | } | |
3513 | /* | |
3514 | * use bio_clone to make a copy of the bio | |
3515 | */ | |
3516 | align_bi = bio_clone(raid_bio, GFP_NOIO); | |
3517 | if (!align_bi) | |
3518 | return 0; | |
3519 | /* | |
3520 | * set bi_end_io to a new function, and set bi_private to the | |
3521 | * original bio. | |
3522 | */ | |
3523 | align_bi->bi_end_io = raid5_align_endio; | |
3524 | align_bi->bi_private = raid_bio; | |
3525 | /* | |
3526 | * compute position | |
3527 | */ | |
3528 | align_bi->bi_sector = raid5_compute_sector(raid_bio->bi_sector, | |
3529 | raid_disks, | |
3530 | data_disks, | |
3531 | &dd_idx, | |
3532 | &pd_idx, | |
3533 | conf); | |
3534 | ||
3535 | rcu_read_lock(); | |
3536 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
3537 | if (rdev && test_bit(In_sync, &rdev->flags)) { | |
f679623f RBJ |
3538 | atomic_inc(&rdev->nr_pending); |
3539 | rcu_read_unlock(); | |
46031f9a RBJ |
3540 | raid_bio->bi_next = (void*)rdev; |
3541 | align_bi->bi_bdev = rdev->bdev; | |
3542 | align_bi->bi_flags &= ~(1 << BIO_SEG_VALID); | |
3543 | align_bi->bi_sector += rdev->data_offset; | |
3544 | ||
387bb173 NB |
3545 | if (!bio_fits_rdev(align_bi)) { |
3546 | /* too big in some way */ | |
3547 | bio_put(align_bi); | |
3548 | rdev_dec_pending(rdev, mddev); | |
3549 | return 0; | |
3550 | } | |
3551 | ||
46031f9a RBJ |
3552 | spin_lock_irq(&conf->device_lock); |
3553 | wait_event_lock_irq(conf->wait_for_stripe, | |
3554 | conf->quiesce == 0, | |
3555 | conf->device_lock, /* nothing */); | |
3556 | atomic_inc(&conf->active_aligned_reads); | |
3557 | spin_unlock_irq(&conf->device_lock); | |
3558 | ||
f679623f RBJ |
3559 | generic_make_request(align_bi); |
3560 | return 1; | |
3561 | } else { | |
3562 | rcu_read_unlock(); | |
46031f9a | 3563 | bio_put(align_bi); |
f679623f RBJ |
3564 | return 0; |
3565 | } | |
3566 | } | |
3567 | ||
3568 | ||
7ecaa1e6 | 3569 | static int make_request(request_queue_t *q, struct bio * bi) |
1da177e4 LT |
3570 | { |
3571 | mddev_t *mddev = q->queuedata; | |
3572 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
1da177e4 LT |
3573 | unsigned int dd_idx, pd_idx; |
3574 | sector_t new_sector; | |
3575 | sector_t logical_sector, last_sector; | |
3576 | struct stripe_head *sh; | |
a362357b | 3577 | const int rw = bio_data_dir(bi); |
f6344757 | 3578 | int remaining; |
1da177e4 | 3579 | |
e5dcdd80 N |
3580 | if (unlikely(bio_barrier(bi))) { |
3581 | bio_endio(bi, bi->bi_size, -EOPNOTSUPP); | |
3582 | return 0; | |
3583 | } | |
3584 | ||
3d310eb7 | 3585 | md_write_start(mddev, bi); |
06d91a5f | 3586 | |
a362357b JA |
3587 | disk_stat_inc(mddev->gendisk, ios[rw]); |
3588 | disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bi)); | |
1da177e4 | 3589 | |
802ba064 | 3590 | if (rw == READ && |
52488615 RBJ |
3591 | mddev->reshape_position == MaxSector && |
3592 | chunk_aligned_read(q,bi)) | |
3593 | return 0; | |
3594 | ||
1da177e4 LT |
3595 | logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
3596 | last_sector = bi->bi_sector + (bi->bi_size>>9); | |
3597 | bi->bi_next = NULL; | |
3598 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
06d91a5f | 3599 | |
1da177e4 LT |
3600 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
3601 | DEFINE_WAIT(w); | |
16a53ecc | 3602 | int disks, data_disks; |
b578d55f | 3603 | |
7ecaa1e6 | 3604 | retry: |
b578d55f | 3605 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
7ecaa1e6 N |
3606 | if (likely(conf->expand_progress == MaxSector)) |
3607 | disks = conf->raid_disks; | |
3608 | else { | |
df8e7f76 N |
3609 | /* spinlock is needed as expand_progress may be |
3610 | * 64bit on a 32bit platform, and so it might be | |
3611 | * possible to see a half-updated value | |
3612 | * Ofcourse expand_progress could change after | |
3613 | * the lock is dropped, so once we get a reference | |
3614 | * to the stripe that we think it is, we will have | |
3615 | * to check again. | |
3616 | */ | |
7ecaa1e6 N |
3617 | spin_lock_irq(&conf->device_lock); |
3618 | disks = conf->raid_disks; | |
3619 | if (logical_sector >= conf->expand_progress) | |
3620 | disks = conf->previous_raid_disks; | |
b578d55f N |
3621 | else { |
3622 | if (logical_sector >= conf->expand_lo) { | |
3623 | spin_unlock_irq(&conf->device_lock); | |
3624 | schedule(); | |
3625 | goto retry; | |
3626 | } | |
3627 | } | |
7ecaa1e6 N |
3628 | spin_unlock_irq(&conf->device_lock); |
3629 | } | |
16a53ecc N |
3630 | data_disks = disks - conf->max_degraded; |
3631 | ||
3632 | new_sector = raid5_compute_sector(logical_sector, disks, data_disks, | |
7ecaa1e6 | 3633 | &dd_idx, &pd_idx, conf); |
45b4233c | 3634 | pr_debug("raid5: make_request, sector %llu logical %llu\n", |
1da177e4 LT |
3635 | (unsigned long long)new_sector, |
3636 | (unsigned long long)logical_sector); | |
3637 | ||
7ecaa1e6 | 3638 | sh = get_active_stripe(conf, new_sector, disks, pd_idx, (bi->bi_rw&RWA_MASK)); |
1da177e4 | 3639 | if (sh) { |
7ecaa1e6 N |
3640 | if (unlikely(conf->expand_progress != MaxSector)) { |
3641 | /* expansion might have moved on while waiting for a | |
df8e7f76 N |
3642 | * stripe, so we must do the range check again. |
3643 | * Expansion could still move past after this | |
3644 | * test, but as we are holding a reference to | |
3645 | * 'sh', we know that if that happens, | |
3646 | * STRIPE_EXPANDING will get set and the expansion | |
3647 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
3648 | */ |
3649 | int must_retry = 0; | |
3650 | spin_lock_irq(&conf->device_lock); | |
3651 | if (logical_sector < conf->expand_progress && | |
3652 | disks == conf->previous_raid_disks) | |
3653 | /* mismatch, need to try again */ | |
3654 | must_retry = 1; | |
3655 | spin_unlock_irq(&conf->device_lock); | |
3656 | if (must_retry) { | |
3657 | release_stripe(sh); | |
3658 | goto retry; | |
3659 | } | |
3660 | } | |
e464eafd N |
3661 | /* FIXME what if we get a false positive because these |
3662 | * are being updated. | |
3663 | */ | |
3664 | if (logical_sector >= mddev->suspend_lo && | |
3665 | logical_sector < mddev->suspend_hi) { | |
3666 | release_stripe(sh); | |
3667 | schedule(); | |
3668 | goto retry; | |
3669 | } | |
7ecaa1e6 N |
3670 | |
3671 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
3672 | !add_stripe_bio(sh, bi, dd_idx, (bi->bi_rw&RW_MASK))) { | |
3673 | /* Stripe is busy expanding or | |
3674 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
3675 | * and wait a while |
3676 | */ | |
3677 | raid5_unplug_device(mddev->queue); | |
3678 | release_stripe(sh); | |
3679 | schedule(); | |
3680 | goto retry; | |
3681 | } | |
3682 | finish_wait(&conf->wait_for_overlap, &w); | |
16a53ecc | 3683 | handle_stripe(sh, NULL); |
1da177e4 | 3684 | release_stripe(sh); |
1da177e4 LT |
3685 | } else { |
3686 | /* cannot get stripe for read-ahead, just give-up */ | |
3687 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
3688 | finish_wait(&conf->wait_for_overlap, &w); | |
3689 | break; | |
3690 | } | |
3691 | ||
3692 | } | |
3693 | spin_lock_irq(&conf->device_lock); | |
f6344757 N |
3694 | remaining = --bi->bi_phys_segments; |
3695 | spin_unlock_irq(&conf->device_lock); | |
3696 | if (remaining == 0) { | |
1da177e4 LT |
3697 | int bytes = bi->bi_size; |
3698 | ||
16a53ecc | 3699 | if ( rw == WRITE ) |
1da177e4 LT |
3700 | md_write_end(mddev); |
3701 | bi->bi_size = 0; | |
c2b00852 N |
3702 | bi->bi_end_io(bi, bytes, |
3703 | test_bit(BIO_UPTODATE, &bi->bi_flags) | |
3704 | ? 0 : -EIO); | |
1da177e4 | 3705 | } |
1da177e4 LT |
3706 | return 0; |
3707 | } | |
3708 | ||
52c03291 | 3709 | static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 3710 | { |
52c03291 N |
3711 | /* reshaping is quite different to recovery/resync so it is |
3712 | * handled quite separately ... here. | |
3713 | * | |
3714 | * On each call to sync_request, we gather one chunk worth of | |
3715 | * destination stripes and flag them as expanding. | |
3716 | * Then we find all the source stripes and request reads. | |
3717 | * As the reads complete, handle_stripe will copy the data | |
3718 | * into the destination stripe and release that stripe. | |
3719 | */ | |
1da177e4 LT |
3720 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; |
3721 | struct stripe_head *sh; | |
ccfcc3c1 N |
3722 | int pd_idx; |
3723 | sector_t first_sector, last_sector; | |
f416885e N |
3724 | int raid_disks = conf->previous_raid_disks; |
3725 | int data_disks = raid_disks - conf->max_degraded; | |
3726 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
3727 | int i; |
3728 | int dd_idx; | |
3729 | sector_t writepos, safepos, gap; | |
3730 | ||
3731 | if (sector_nr == 0 && | |
3732 | conf->expand_progress != 0) { | |
3733 | /* restarting in the middle, skip the initial sectors */ | |
3734 | sector_nr = conf->expand_progress; | |
f416885e | 3735 | sector_div(sector_nr, new_data_disks); |
52c03291 N |
3736 | *skipped = 1; |
3737 | return sector_nr; | |
3738 | } | |
3739 | ||
3740 | /* we update the metadata when there is more than 3Meg | |
3741 | * in the block range (that is rather arbitrary, should | |
3742 | * probably be time based) or when the data about to be | |
3743 | * copied would over-write the source of the data at | |
3744 | * the front of the range. | |
3745 | * i.e. one new_stripe forward from expand_progress new_maps | |
3746 | * to after where expand_lo old_maps to | |
3747 | */ | |
3748 | writepos = conf->expand_progress + | |
f416885e N |
3749 | conf->chunk_size/512*(new_data_disks); |
3750 | sector_div(writepos, new_data_disks); | |
52c03291 | 3751 | safepos = conf->expand_lo; |
f416885e | 3752 | sector_div(safepos, data_disks); |
52c03291 N |
3753 | gap = conf->expand_progress - conf->expand_lo; |
3754 | ||
3755 | if (writepos >= safepos || | |
f416885e | 3756 | gap > (new_data_disks)*3000*2 /*3Meg*/) { |
52c03291 N |
3757 | /* Cannot proceed until we've updated the superblock... */ |
3758 | wait_event(conf->wait_for_overlap, | |
3759 | atomic_read(&conf->reshape_stripes)==0); | |
3760 | mddev->reshape_position = conf->expand_progress; | |
850b2b42 | 3761 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
52c03291 | 3762 | md_wakeup_thread(mddev->thread); |
850b2b42 | 3763 | wait_event(mddev->sb_wait, mddev->flags == 0 || |
52c03291 N |
3764 | kthread_should_stop()); |
3765 | spin_lock_irq(&conf->device_lock); | |
3766 | conf->expand_lo = mddev->reshape_position; | |
3767 | spin_unlock_irq(&conf->device_lock); | |
3768 | wake_up(&conf->wait_for_overlap); | |
3769 | } | |
3770 | ||
3771 | for (i=0; i < conf->chunk_size/512; i+= STRIPE_SECTORS) { | |
3772 | int j; | |
3773 | int skipped = 0; | |
3774 | pd_idx = stripe_to_pdidx(sector_nr+i, conf, conf->raid_disks); | |
3775 | sh = get_active_stripe(conf, sector_nr+i, | |
3776 | conf->raid_disks, pd_idx, 0); | |
3777 | set_bit(STRIPE_EXPANDING, &sh->state); | |
3778 | atomic_inc(&conf->reshape_stripes); | |
3779 | /* If any of this stripe is beyond the end of the old | |
3780 | * array, then we need to zero those blocks | |
3781 | */ | |
3782 | for (j=sh->disks; j--;) { | |
3783 | sector_t s; | |
3784 | if (j == sh->pd_idx) | |
3785 | continue; | |
f416885e N |
3786 | if (conf->level == 6 && |
3787 | j == raid6_next_disk(sh->pd_idx, sh->disks)) | |
3788 | continue; | |
52c03291 N |
3789 | s = compute_blocknr(sh, j); |
3790 | if (s < (mddev->array_size<<1)) { | |
3791 | skipped = 1; | |
3792 | continue; | |
3793 | } | |
3794 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
3795 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
3796 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
3797 | } | |
3798 | if (!skipped) { | |
3799 | set_bit(STRIPE_EXPAND_READY, &sh->state); | |
3800 | set_bit(STRIPE_HANDLE, &sh->state); | |
3801 | } | |
3802 | release_stripe(sh); | |
3803 | } | |
3804 | spin_lock_irq(&conf->device_lock); | |
6d3baf2e | 3805 | conf->expand_progress = (sector_nr + i) * new_data_disks; |
52c03291 N |
3806 | spin_unlock_irq(&conf->device_lock); |
3807 | /* Ok, those stripe are ready. We can start scheduling | |
3808 | * reads on the source stripes. | |
3809 | * The source stripes are determined by mapping the first and last | |
3810 | * block on the destination stripes. | |
3811 | */ | |
52c03291 | 3812 | first_sector = |
f416885e | 3813 | raid5_compute_sector(sector_nr*(new_data_disks), |
52c03291 N |
3814 | raid_disks, data_disks, |
3815 | &dd_idx, &pd_idx, conf); | |
3816 | last_sector = | |
3817 | raid5_compute_sector((sector_nr+conf->chunk_size/512) | |
f416885e | 3818 | *(new_data_disks) -1, |
52c03291 N |
3819 | raid_disks, data_disks, |
3820 | &dd_idx, &pd_idx, conf); | |
3821 | if (last_sector >= (mddev->size<<1)) | |
3822 | last_sector = (mddev->size<<1)-1; | |
3823 | while (first_sector <= last_sector) { | |
f416885e N |
3824 | pd_idx = stripe_to_pdidx(first_sector, conf, |
3825 | conf->previous_raid_disks); | |
52c03291 N |
3826 | sh = get_active_stripe(conf, first_sector, |
3827 | conf->previous_raid_disks, pd_idx, 0); | |
3828 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); | |
3829 | set_bit(STRIPE_HANDLE, &sh->state); | |
3830 | release_stripe(sh); | |
3831 | first_sector += STRIPE_SECTORS; | |
3832 | } | |
3833 | return conf->chunk_size>>9; | |
3834 | } | |
3835 | ||
3836 | /* FIXME go_faster isn't used */ | |
3837 | static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) | |
3838 | { | |
3839 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
3840 | struct stripe_head *sh; | |
3841 | int pd_idx; | |
1da177e4 | 3842 | int raid_disks = conf->raid_disks; |
72626685 N |
3843 | sector_t max_sector = mddev->size << 1; |
3844 | int sync_blocks; | |
16a53ecc N |
3845 | int still_degraded = 0; |
3846 | int i; | |
1da177e4 | 3847 | |
72626685 | 3848 | if (sector_nr >= max_sector) { |
1da177e4 LT |
3849 | /* just being told to finish up .. nothing much to do */ |
3850 | unplug_slaves(mddev); | |
29269553 N |
3851 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
3852 | end_reshape(conf); | |
3853 | return 0; | |
3854 | } | |
72626685 N |
3855 | |
3856 | if (mddev->curr_resync < max_sector) /* aborted */ | |
3857 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
3858 | &sync_blocks, 1); | |
16a53ecc | 3859 | else /* completed sync */ |
72626685 N |
3860 | conf->fullsync = 0; |
3861 | bitmap_close_sync(mddev->bitmap); | |
3862 | ||
1da177e4 LT |
3863 | return 0; |
3864 | } | |
ccfcc3c1 | 3865 | |
52c03291 N |
3866 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3867 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 3868 | |
16a53ecc | 3869 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
3870 | * to resync, then assert that we are finished, because there is |
3871 | * nothing we can do. | |
3872 | */ | |
3285edf1 | 3873 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 3874 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
57afd89f N |
3875 | sector_t rv = (mddev->size << 1) - sector_nr; |
3876 | *skipped = 1; | |
1da177e4 LT |
3877 | return rv; |
3878 | } | |
72626685 | 3879 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
3855ad9f | 3880 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
72626685 N |
3881 | !conf->fullsync && sync_blocks >= STRIPE_SECTORS) { |
3882 | /* we can skip this block, and probably more */ | |
3883 | sync_blocks /= STRIPE_SECTORS; | |
3884 | *skipped = 1; | |
3885 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
3886 | } | |
1da177e4 | 3887 | |
ccfcc3c1 | 3888 | pd_idx = stripe_to_pdidx(sector_nr, conf, raid_disks); |
7ecaa1e6 | 3889 | sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 1); |
1da177e4 | 3890 | if (sh == NULL) { |
7ecaa1e6 | 3891 | sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 0); |
1da177e4 | 3892 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 3893 | * is trying to get access |
1da177e4 | 3894 | */ |
66c006a5 | 3895 | schedule_timeout_uninterruptible(1); |
1da177e4 | 3896 | } |
16a53ecc N |
3897 | /* Need to check if array will still be degraded after recovery/resync |
3898 | * We don't need to check the 'failed' flag as when that gets set, | |
3899 | * recovery aborts. | |
3900 | */ | |
3901 | for (i=0; i<mddev->raid_disks; i++) | |
3902 | if (conf->disks[i].rdev == NULL) | |
3903 | still_degraded = 1; | |
3904 | ||
3905 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
3906 | ||
3907 | spin_lock(&sh->lock); | |
1da177e4 LT |
3908 | set_bit(STRIPE_SYNCING, &sh->state); |
3909 | clear_bit(STRIPE_INSYNC, &sh->state); | |
3910 | spin_unlock(&sh->lock); | |
3911 | ||
16a53ecc | 3912 | handle_stripe(sh, NULL); |
1da177e4 LT |
3913 | release_stripe(sh); |
3914 | ||
3915 | return STRIPE_SECTORS; | |
3916 | } | |
3917 | ||
46031f9a RBJ |
3918 | static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) |
3919 | { | |
3920 | /* We may not be able to submit a whole bio at once as there | |
3921 | * may not be enough stripe_heads available. | |
3922 | * We cannot pre-allocate enough stripe_heads as we may need | |
3923 | * more than exist in the cache (if we allow ever large chunks). | |
3924 | * So we do one stripe head at a time and record in | |
3925 | * ->bi_hw_segments how many have been done. | |
3926 | * | |
3927 | * We *know* that this entire raid_bio is in one chunk, so | |
3928 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
3929 | */ | |
3930 | struct stripe_head *sh; | |
3931 | int dd_idx, pd_idx; | |
3932 | sector_t sector, logical_sector, last_sector; | |
3933 | int scnt = 0; | |
3934 | int remaining; | |
3935 | int handled = 0; | |
3936 | ||
3937 | logical_sector = raid_bio->bi_sector & ~((sector_t)STRIPE_SECTORS-1); | |
3938 | sector = raid5_compute_sector( logical_sector, | |
3939 | conf->raid_disks, | |
3940 | conf->raid_disks - conf->max_degraded, | |
3941 | &dd_idx, | |
3942 | &pd_idx, | |
3943 | conf); | |
3944 | last_sector = raid_bio->bi_sector + (raid_bio->bi_size>>9); | |
3945 | ||
3946 | for (; logical_sector < last_sector; | |
387bb173 NB |
3947 | logical_sector += STRIPE_SECTORS, |
3948 | sector += STRIPE_SECTORS, | |
3949 | scnt++) { | |
46031f9a RBJ |
3950 | |
3951 | if (scnt < raid_bio->bi_hw_segments) | |
3952 | /* already done this stripe */ | |
3953 | continue; | |
3954 | ||
3955 | sh = get_active_stripe(conf, sector, conf->raid_disks, pd_idx, 1); | |
3956 | ||
3957 | if (!sh) { | |
3958 | /* failed to get a stripe - must wait */ | |
3959 | raid_bio->bi_hw_segments = scnt; | |
3960 | conf->retry_read_aligned = raid_bio; | |
3961 | return handled; | |
3962 | } | |
3963 | ||
3964 | set_bit(R5_ReadError, &sh->dev[dd_idx].flags); | |
387bb173 NB |
3965 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) { |
3966 | release_stripe(sh); | |
3967 | raid_bio->bi_hw_segments = scnt; | |
3968 | conf->retry_read_aligned = raid_bio; | |
3969 | return handled; | |
3970 | } | |
3971 | ||
46031f9a RBJ |
3972 | handle_stripe(sh, NULL); |
3973 | release_stripe(sh); | |
3974 | handled++; | |
3975 | } | |
3976 | spin_lock_irq(&conf->device_lock); | |
3977 | remaining = --raid_bio->bi_phys_segments; | |
3978 | spin_unlock_irq(&conf->device_lock); | |
3979 | if (remaining == 0) { | |
3980 | int bytes = raid_bio->bi_size; | |
3981 | ||
3982 | raid_bio->bi_size = 0; | |
c2b00852 N |
3983 | raid_bio->bi_end_io(raid_bio, bytes, |
3984 | test_bit(BIO_UPTODATE, &raid_bio->bi_flags) | |
3985 | ? 0 : -EIO); | |
46031f9a RBJ |
3986 | } |
3987 | if (atomic_dec_and_test(&conf->active_aligned_reads)) | |
3988 | wake_up(&conf->wait_for_stripe); | |
3989 | return handled; | |
3990 | } | |
3991 | ||
3992 | ||
3993 | ||
1da177e4 LT |
3994 | /* |
3995 | * This is our raid5 kernel thread. | |
3996 | * | |
3997 | * We scan the hash table for stripes which can be handled now. | |
3998 | * During the scan, completed stripes are saved for us by the interrupt | |
3999 | * handler, so that they will not have to wait for our next wakeup. | |
4000 | */ | |
4001 | static void raid5d (mddev_t *mddev) | |
4002 | { | |
4003 | struct stripe_head *sh; | |
4004 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4005 | int handled; | |
4006 | ||
45b4233c | 4007 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
4008 | |
4009 | md_check_recovery(mddev); | |
1da177e4 LT |
4010 | |
4011 | handled = 0; | |
4012 | spin_lock_irq(&conf->device_lock); | |
4013 | while (1) { | |
4014 | struct list_head *first; | |
46031f9a | 4015 | struct bio *bio; |
1da177e4 | 4016 | |
ae3c20cc | 4017 | if (conf->seq_flush != conf->seq_write) { |
72626685 | 4018 | int seq = conf->seq_flush; |
700e432d | 4019 | spin_unlock_irq(&conf->device_lock); |
72626685 | 4020 | bitmap_unplug(mddev->bitmap); |
700e432d | 4021 | spin_lock_irq(&conf->device_lock); |
72626685 N |
4022 | conf->seq_write = seq; |
4023 | activate_bit_delay(conf); | |
4024 | } | |
4025 | ||
1da177e4 LT |
4026 | if (list_empty(&conf->handle_list) && |
4027 | atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD && | |
4028 | !blk_queue_plugged(mddev->queue) && | |
4029 | !list_empty(&conf->delayed_list)) | |
4030 | raid5_activate_delayed(conf); | |
4031 | ||
46031f9a RBJ |
4032 | while ((bio = remove_bio_from_retry(conf))) { |
4033 | int ok; | |
4034 | spin_unlock_irq(&conf->device_lock); | |
4035 | ok = retry_aligned_read(conf, bio); | |
4036 | spin_lock_irq(&conf->device_lock); | |
4037 | if (!ok) | |
4038 | break; | |
4039 | handled++; | |
4040 | } | |
4041 | ||
d84e0f10 DW |
4042 | if (list_empty(&conf->handle_list)) { |
4043 | async_tx_issue_pending_all(); | |
1da177e4 | 4044 | break; |
d84e0f10 | 4045 | } |
1da177e4 LT |
4046 | |
4047 | first = conf->handle_list.next; | |
4048 | sh = list_entry(first, struct stripe_head, lru); | |
4049 | ||
4050 | list_del_init(first); | |
4051 | atomic_inc(&sh->count); | |
78bafebd | 4052 | BUG_ON(atomic_read(&sh->count)!= 1); |
1da177e4 LT |
4053 | spin_unlock_irq(&conf->device_lock); |
4054 | ||
4055 | handled++; | |
16a53ecc | 4056 | handle_stripe(sh, conf->spare_page); |
1da177e4 LT |
4057 | release_stripe(sh); |
4058 | ||
4059 | spin_lock_irq(&conf->device_lock); | |
4060 | } | |
45b4233c | 4061 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
4062 | |
4063 | spin_unlock_irq(&conf->device_lock); | |
4064 | ||
4065 | unplug_slaves(mddev); | |
4066 | ||
45b4233c | 4067 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
4068 | } |
4069 | ||
3f294f4f | 4070 | static ssize_t |
007583c9 | 4071 | raid5_show_stripe_cache_size(mddev_t *mddev, char *page) |
3f294f4f | 4072 | { |
007583c9 | 4073 | raid5_conf_t *conf = mddev_to_conf(mddev); |
96de1e66 N |
4074 | if (conf) |
4075 | return sprintf(page, "%d\n", conf->max_nr_stripes); | |
4076 | else | |
4077 | return 0; | |
3f294f4f N |
4078 | } |
4079 | ||
4080 | static ssize_t | |
007583c9 | 4081 | raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len) |
3f294f4f | 4082 | { |
007583c9 | 4083 | raid5_conf_t *conf = mddev_to_conf(mddev); |
3f294f4f N |
4084 | char *end; |
4085 | int new; | |
4086 | if (len >= PAGE_SIZE) | |
4087 | return -EINVAL; | |
96de1e66 N |
4088 | if (!conf) |
4089 | return -ENODEV; | |
3f294f4f N |
4090 | |
4091 | new = simple_strtoul(page, &end, 10); | |
4092 | if (!*page || (*end && *end != '\n') ) | |
4093 | return -EINVAL; | |
4094 | if (new <= 16 || new > 32768) | |
4095 | return -EINVAL; | |
4096 | while (new < conf->max_nr_stripes) { | |
4097 | if (drop_one_stripe(conf)) | |
4098 | conf->max_nr_stripes--; | |
4099 | else | |
4100 | break; | |
4101 | } | |
2a2275d6 | 4102 | md_allow_write(mddev); |
3f294f4f N |
4103 | while (new > conf->max_nr_stripes) { |
4104 | if (grow_one_stripe(conf)) | |
4105 | conf->max_nr_stripes++; | |
4106 | else break; | |
4107 | } | |
4108 | return len; | |
4109 | } | |
007583c9 | 4110 | |
96de1e66 N |
4111 | static struct md_sysfs_entry |
4112 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
4113 | raid5_show_stripe_cache_size, | |
4114 | raid5_store_stripe_cache_size); | |
3f294f4f N |
4115 | |
4116 | static ssize_t | |
96de1e66 | 4117 | stripe_cache_active_show(mddev_t *mddev, char *page) |
3f294f4f | 4118 | { |
007583c9 | 4119 | raid5_conf_t *conf = mddev_to_conf(mddev); |
96de1e66 N |
4120 | if (conf) |
4121 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
4122 | else | |
4123 | return 0; | |
3f294f4f N |
4124 | } |
4125 | ||
96de1e66 N |
4126 | static struct md_sysfs_entry |
4127 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 4128 | |
007583c9 | 4129 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
4130 | &raid5_stripecache_size.attr, |
4131 | &raid5_stripecache_active.attr, | |
4132 | NULL, | |
4133 | }; | |
007583c9 N |
4134 | static struct attribute_group raid5_attrs_group = { |
4135 | .name = NULL, | |
4136 | .attrs = raid5_attrs, | |
3f294f4f N |
4137 | }; |
4138 | ||
72626685 | 4139 | static int run(mddev_t *mddev) |
1da177e4 LT |
4140 | { |
4141 | raid5_conf_t *conf; | |
4142 | int raid_disk, memory; | |
4143 | mdk_rdev_t *rdev; | |
4144 | struct disk_info *disk; | |
4145 | struct list_head *tmp; | |
02c2de8c | 4146 | int working_disks = 0; |
1da177e4 | 4147 | |
16a53ecc N |
4148 | if (mddev->level != 5 && mddev->level != 4 && mddev->level != 6) { |
4149 | printk(KERN_ERR "raid5: %s: raid level not set to 4/5/6 (%d)\n", | |
14f8d26b | 4150 | mdname(mddev), mddev->level); |
1da177e4 LT |
4151 | return -EIO; |
4152 | } | |
4153 | ||
f6705578 N |
4154 | if (mddev->reshape_position != MaxSector) { |
4155 | /* Check that we can continue the reshape. | |
4156 | * Currently only disks can change, it must | |
4157 | * increase, and we must be past the point where | |
4158 | * a stripe over-writes itself | |
4159 | */ | |
4160 | sector_t here_new, here_old; | |
4161 | int old_disks; | |
f416885e | 4162 | int max_degraded = (mddev->level == 5 ? 1 : 2); |
f6705578 N |
4163 | |
4164 | if (mddev->new_level != mddev->level || | |
4165 | mddev->new_layout != mddev->layout || | |
4166 | mddev->new_chunk != mddev->chunk_size) { | |
f416885e N |
4167 | printk(KERN_ERR "raid5: %s: unsupported reshape " |
4168 | "required - aborting.\n", | |
f6705578 N |
4169 | mdname(mddev)); |
4170 | return -EINVAL; | |
4171 | } | |
4172 | if (mddev->delta_disks <= 0) { | |
f416885e N |
4173 | printk(KERN_ERR "raid5: %s: unsupported reshape " |
4174 | "(reduce disks) required - aborting.\n", | |
f6705578 N |
4175 | mdname(mddev)); |
4176 | return -EINVAL; | |
4177 | } | |
4178 | old_disks = mddev->raid_disks - mddev->delta_disks; | |
4179 | /* reshape_position must be on a new-stripe boundary, and one | |
f416885e N |
4180 | * further up in new geometry must map after here in old |
4181 | * geometry. | |
f6705578 N |
4182 | */ |
4183 | here_new = mddev->reshape_position; | |
f416885e N |
4184 | if (sector_div(here_new, (mddev->chunk_size>>9)* |
4185 | (mddev->raid_disks - max_degraded))) { | |
4186 | printk(KERN_ERR "raid5: reshape_position not " | |
4187 | "on a stripe boundary\n"); | |
f6705578 N |
4188 | return -EINVAL; |
4189 | } | |
4190 | /* here_new is the stripe we will write to */ | |
4191 | here_old = mddev->reshape_position; | |
f416885e N |
4192 | sector_div(here_old, (mddev->chunk_size>>9)* |
4193 | (old_disks-max_degraded)); | |
4194 | /* here_old is the first stripe that we might need to read | |
4195 | * from */ | |
f6705578 N |
4196 | if (here_new >= here_old) { |
4197 | /* Reading from the same stripe as writing to - bad */ | |
f416885e N |
4198 | printk(KERN_ERR "raid5: reshape_position too early for " |
4199 | "auto-recovery - aborting.\n"); | |
f6705578 N |
4200 | return -EINVAL; |
4201 | } | |
4202 | printk(KERN_INFO "raid5: reshape will continue\n"); | |
4203 | /* OK, we should be able to continue; */ | |
4204 | } | |
4205 | ||
4206 | ||
b55e6bfc | 4207 | mddev->private = kzalloc(sizeof (raid5_conf_t), GFP_KERNEL); |
1da177e4 LT |
4208 | if ((conf = mddev->private) == NULL) |
4209 | goto abort; | |
f6705578 N |
4210 | if (mddev->reshape_position == MaxSector) { |
4211 | conf->previous_raid_disks = conf->raid_disks = mddev->raid_disks; | |
4212 | } else { | |
4213 | conf->raid_disks = mddev->raid_disks; | |
4214 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; | |
4215 | } | |
4216 | ||
4217 | conf->disks = kzalloc(conf->raid_disks * sizeof(struct disk_info), | |
b55e6bfc N |
4218 | GFP_KERNEL); |
4219 | if (!conf->disks) | |
4220 | goto abort; | |
9ffae0cf | 4221 | |
1da177e4 LT |
4222 | conf->mddev = mddev; |
4223 | ||
fccddba0 | 4224 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 4225 | goto abort; |
1da177e4 | 4226 | |
16a53ecc N |
4227 | if (mddev->level == 6) { |
4228 | conf->spare_page = alloc_page(GFP_KERNEL); | |
4229 | if (!conf->spare_page) | |
4230 | goto abort; | |
4231 | } | |
1da177e4 LT |
4232 | spin_lock_init(&conf->device_lock); |
4233 | init_waitqueue_head(&conf->wait_for_stripe); | |
4234 | init_waitqueue_head(&conf->wait_for_overlap); | |
4235 | INIT_LIST_HEAD(&conf->handle_list); | |
4236 | INIT_LIST_HEAD(&conf->delayed_list); | |
72626685 | 4237 | INIT_LIST_HEAD(&conf->bitmap_list); |
1da177e4 LT |
4238 | INIT_LIST_HEAD(&conf->inactive_list); |
4239 | atomic_set(&conf->active_stripes, 0); | |
4240 | atomic_set(&conf->preread_active_stripes, 0); | |
46031f9a | 4241 | atomic_set(&conf->active_aligned_reads, 0); |
1da177e4 | 4242 | |
45b4233c | 4243 | pr_debug("raid5: run(%s) called.\n", mdname(mddev)); |
1da177e4 LT |
4244 | |
4245 | ITERATE_RDEV(mddev,rdev,tmp) { | |
4246 | raid_disk = rdev->raid_disk; | |
f6705578 | 4247 | if (raid_disk >= conf->raid_disks |
1da177e4 LT |
4248 | || raid_disk < 0) |
4249 | continue; | |
4250 | disk = conf->disks + raid_disk; | |
4251 | ||
4252 | disk->rdev = rdev; | |
4253 | ||
b2d444d7 | 4254 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4255 | char b[BDEVNAME_SIZE]; |
4256 | printk(KERN_INFO "raid5: device %s operational as raid" | |
4257 | " disk %d\n", bdevname(rdev->bdev,b), | |
4258 | raid_disk); | |
02c2de8c | 4259 | working_disks++; |
1da177e4 LT |
4260 | } |
4261 | } | |
4262 | ||
1da177e4 | 4263 | /* |
16a53ecc | 4264 | * 0 for a fully functional array, 1 or 2 for a degraded array. |
1da177e4 | 4265 | */ |
02c2de8c | 4266 | mddev->degraded = conf->raid_disks - working_disks; |
1da177e4 LT |
4267 | conf->mddev = mddev; |
4268 | conf->chunk_size = mddev->chunk_size; | |
4269 | conf->level = mddev->level; | |
16a53ecc N |
4270 | if (conf->level == 6) |
4271 | conf->max_degraded = 2; | |
4272 | else | |
4273 | conf->max_degraded = 1; | |
1da177e4 LT |
4274 | conf->algorithm = mddev->layout; |
4275 | conf->max_nr_stripes = NR_STRIPES; | |
f6705578 | 4276 | conf->expand_progress = mddev->reshape_position; |
1da177e4 LT |
4277 | |
4278 | /* device size must be a multiple of chunk size */ | |
4279 | mddev->size &= ~(mddev->chunk_size/1024 -1); | |
b1581566 | 4280 | mddev->resync_max_sectors = mddev->size << 1; |
1da177e4 | 4281 | |
16a53ecc N |
4282 | if (conf->level == 6 && conf->raid_disks < 4) { |
4283 | printk(KERN_ERR "raid6: not enough configured devices for %s (%d, minimum 4)\n", | |
4284 | mdname(mddev), conf->raid_disks); | |
4285 | goto abort; | |
4286 | } | |
1da177e4 LT |
4287 | if (!conf->chunk_size || conf->chunk_size % 4) { |
4288 | printk(KERN_ERR "raid5: invalid chunk size %d for %s\n", | |
4289 | conf->chunk_size, mdname(mddev)); | |
4290 | goto abort; | |
4291 | } | |
4292 | if (conf->algorithm > ALGORITHM_RIGHT_SYMMETRIC) { | |
4293 | printk(KERN_ERR | |
4294 | "raid5: unsupported parity algorithm %d for %s\n", | |
4295 | conf->algorithm, mdname(mddev)); | |
4296 | goto abort; | |
4297 | } | |
16a53ecc | 4298 | if (mddev->degraded > conf->max_degraded) { |
1da177e4 LT |
4299 | printk(KERN_ERR "raid5: not enough operational devices for %s" |
4300 | " (%d/%d failed)\n", | |
02c2de8c | 4301 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
4302 | goto abort; |
4303 | } | |
4304 | ||
16a53ecc | 4305 | if (mddev->degraded > 0 && |
1da177e4 | 4306 | mddev->recovery_cp != MaxSector) { |
6ff8d8ec N |
4307 | if (mddev->ok_start_degraded) |
4308 | printk(KERN_WARNING | |
4309 | "raid5: starting dirty degraded array: %s" | |
4310 | "- data corruption possible.\n", | |
4311 | mdname(mddev)); | |
4312 | else { | |
4313 | printk(KERN_ERR | |
4314 | "raid5: cannot start dirty degraded array for %s\n", | |
4315 | mdname(mddev)); | |
4316 | goto abort; | |
4317 | } | |
1da177e4 LT |
4318 | } |
4319 | ||
4320 | { | |
4321 | mddev->thread = md_register_thread(raid5d, mddev, "%s_raid5"); | |
4322 | if (!mddev->thread) { | |
4323 | printk(KERN_ERR | |
4324 | "raid5: couldn't allocate thread for %s\n", | |
4325 | mdname(mddev)); | |
4326 | goto abort; | |
4327 | } | |
4328 | } | |
5036805b | 4329 | memory = conf->max_nr_stripes * (sizeof(struct stripe_head) + |
1da177e4 LT |
4330 | conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
4331 | if (grow_stripes(conf, conf->max_nr_stripes)) { | |
4332 | printk(KERN_ERR | |
4333 | "raid5: couldn't allocate %dkB for buffers\n", memory); | |
4334 | shrink_stripes(conf); | |
4335 | md_unregister_thread(mddev->thread); | |
4336 | goto abort; | |
4337 | } else | |
4338 | printk(KERN_INFO "raid5: allocated %dkB for %s\n", | |
4339 | memory, mdname(mddev)); | |
4340 | ||
4341 | if (mddev->degraded == 0) | |
4342 | printk("raid5: raid level %d set %s active with %d out of %d" | |
4343 | " devices, algorithm %d\n", conf->level, mdname(mddev), | |
4344 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, | |
4345 | conf->algorithm); | |
4346 | else | |
4347 | printk(KERN_ALERT "raid5: raid level %d set %s active with %d" | |
4348 | " out of %d devices, algorithm %d\n", conf->level, | |
4349 | mdname(mddev), mddev->raid_disks - mddev->degraded, | |
4350 | mddev->raid_disks, conf->algorithm); | |
4351 | ||
4352 | print_raid5_conf(conf); | |
4353 | ||
f6705578 N |
4354 | if (conf->expand_progress != MaxSector) { |
4355 | printk("...ok start reshape thread\n"); | |
b578d55f | 4356 | conf->expand_lo = conf->expand_progress; |
f6705578 N |
4357 | atomic_set(&conf->reshape_stripes, 0); |
4358 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4359 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4360 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
4361 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4362 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
4363 | "%s_reshape"); | |
f6705578 N |
4364 | } |
4365 | ||
1da177e4 | 4366 | /* read-ahead size must cover two whole stripes, which is |
16a53ecc | 4367 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices |
1da177e4 LT |
4368 | */ |
4369 | { | |
16a53ecc N |
4370 | int data_disks = conf->previous_raid_disks - conf->max_degraded; |
4371 | int stripe = data_disks * | |
8932c2e0 | 4372 | (mddev->chunk_size / PAGE_SIZE); |
1da177e4 LT |
4373 | if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
4374 | mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
4375 | } | |
4376 | ||
4377 | /* Ok, everything is just fine now */ | |
5e55e2f5 N |
4378 | if (sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) |
4379 | printk(KERN_WARNING | |
4380 | "raid5: failed to create sysfs attributes for %s\n", | |
4381 | mdname(mddev)); | |
7a5febe9 N |
4382 | |
4383 | mddev->queue->unplug_fn = raid5_unplug_device; | |
4384 | mddev->queue->issue_flush_fn = raid5_issue_flush; | |
f022b2fd | 4385 | mddev->queue->backing_dev_info.congested_data = mddev; |
041ae52e | 4386 | mddev->queue->backing_dev_info.congested_fn = raid5_congested; |
f022b2fd | 4387 | |
16a53ecc N |
4388 | mddev->array_size = mddev->size * (conf->previous_raid_disks - |
4389 | conf->max_degraded); | |
7a5febe9 | 4390 | |
23032a0e RBJ |
4391 | blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); |
4392 | ||
1da177e4 LT |
4393 | return 0; |
4394 | abort: | |
4395 | if (conf) { | |
4396 | print_raid5_conf(conf); | |
16a53ecc | 4397 | safe_put_page(conf->spare_page); |
b55e6bfc | 4398 | kfree(conf->disks); |
fccddba0 | 4399 | kfree(conf->stripe_hashtbl); |
1da177e4 LT |
4400 | kfree(conf); |
4401 | } | |
4402 | mddev->private = NULL; | |
4403 | printk(KERN_ALERT "raid5: failed to run raid set %s\n", mdname(mddev)); | |
4404 | return -EIO; | |
4405 | } | |
4406 | ||
4407 | ||
4408 | ||
3f294f4f | 4409 | static int stop(mddev_t *mddev) |
1da177e4 LT |
4410 | { |
4411 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
4412 | ||
4413 | md_unregister_thread(mddev->thread); | |
4414 | mddev->thread = NULL; | |
4415 | shrink_stripes(conf); | |
fccddba0 | 4416 | kfree(conf->stripe_hashtbl); |
041ae52e | 4417 | mddev->queue->backing_dev_info.congested_fn = NULL; |
1da177e4 | 4418 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ |
007583c9 | 4419 | sysfs_remove_group(&mddev->kobj, &raid5_attrs_group); |
b55e6bfc | 4420 | kfree(conf->disks); |
96de1e66 | 4421 | kfree(conf); |
1da177e4 LT |
4422 | mddev->private = NULL; |
4423 | return 0; | |
4424 | } | |
4425 | ||
45b4233c | 4426 | #ifdef DEBUG |
16a53ecc | 4427 | static void print_sh (struct seq_file *seq, struct stripe_head *sh) |
1da177e4 LT |
4428 | { |
4429 | int i; | |
4430 | ||
16a53ecc N |
4431 | seq_printf(seq, "sh %llu, pd_idx %d, state %ld.\n", |
4432 | (unsigned long long)sh->sector, sh->pd_idx, sh->state); | |
4433 | seq_printf(seq, "sh %llu, count %d.\n", | |
4434 | (unsigned long long)sh->sector, atomic_read(&sh->count)); | |
4435 | seq_printf(seq, "sh %llu, ", (unsigned long long)sh->sector); | |
7ecaa1e6 | 4436 | for (i = 0; i < sh->disks; i++) { |
16a53ecc N |
4437 | seq_printf(seq, "(cache%d: %p %ld) ", |
4438 | i, sh->dev[i].page, sh->dev[i].flags); | |
1da177e4 | 4439 | } |
16a53ecc | 4440 | seq_printf(seq, "\n"); |
1da177e4 LT |
4441 | } |
4442 | ||
16a53ecc | 4443 | static void printall (struct seq_file *seq, raid5_conf_t *conf) |
1da177e4 LT |
4444 | { |
4445 | struct stripe_head *sh; | |
fccddba0 | 4446 | struct hlist_node *hn; |
1da177e4 LT |
4447 | int i; |
4448 | ||
4449 | spin_lock_irq(&conf->device_lock); | |
4450 | for (i = 0; i < NR_HASH; i++) { | |
fccddba0 | 4451 | hlist_for_each_entry(sh, hn, &conf->stripe_hashtbl[i], hash) { |
1da177e4 LT |
4452 | if (sh->raid_conf != conf) |
4453 | continue; | |
16a53ecc | 4454 | print_sh(seq, sh); |
1da177e4 LT |
4455 | } |
4456 | } | |
4457 | spin_unlock_irq(&conf->device_lock); | |
4458 | } | |
4459 | #endif | |
4460 | ||
4461 | static void status (struct seq_file *seq, mddev_t *mddev) | |
4462 | { | |
4463 | raid5_conf_t *conf = (raid5_conf_t *) mddev->private; | |
4464 | int i; | |
4465 | ||
4466 | seq_printf (seq, " level %d, %dk chunk, algorithm %d", mddev->level, mddev->chunk_size >> 10, mddev->layout); | |
02c2de8c | 4467 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
1da177e4 LT |
4468 | for (i = 0; i < conf->raid_disks; i++) |
4469 | seq_printf (seq, "%s", | |
4470 | conf->disks[i].rdev && | |
b2d444d7 | 4471 | test_bit(In_sync, &conf->disks[i].rdev->flags) ? "U" : "_"); |
1da177e4 | 4472 | seq_printf (seq, "]"); |
45b4233c | 4473 | #ifdef DEBUG |
16a53ecc N |
4474 | seq_printf (seq, "\n"); |
4475 | printall(seq, conf); | |
1da177e4 LT |
4476 | #endif |
4477 | } | |
4478 | ||
4479 | static void print_raid5_conf (raid5_conf_t *conf) | |
4480 | { | |
4481 | int i; | |
4482 | struct disk_info *tmp; | |
4483 | ||
4484 | printk("RAID5 conf printout:\n"); | |
4485 | if (!conf) { | |
4486 | printk("(conf==NULL)\n"); | |
4487 | return; | |
4488 | } | |
02c2de8c N |
4489 | printk(" --- rd:%d wd:%d\n", conf->raid_disks, |
4490 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
4491 | |
4492 | for (i = 0; i < conf->raid_disks; i++) { | |
4493 | char b[BDEVNAME_SIZE]; | |
4494 | tmp = conf->disks + i; | |
4495 | if (tmp->rdev) | |
4496 | printk(" disk %d, o:%d, dev:%s\n", | |
b2d444d7 | 4497 | i, !test_bit(Faulty, &tmp->rdev->flags), |
1da177e4 LT |
4498 | bdevname(tmp->rdev->bdev,b)); |
4499 | } | |
4500 | } | |
4501 | ||
4502 | static int raid5_spare_active(mddev_t *mddev) | |
4503 | { | |
4504 | int i; | |
4505 | raid5_conf_t *conf = mddev->private; | |
4506 | struct disk_info *tmp; | |
4507 | ||
4508 | for (i = 0; i < conf->raid_disks; i++) { | |
4509 | tmp = conf->disks + i; | |
4510 | if (tmp->rdev | |
b2d444d7 | 4511 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa N |
4512 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
4513 | unsigned long flags; | |
4514 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 4515 | mddev->degraded--; |
c04be0aa | 4516 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
4517 | } |
4518 | } | |
4519 | print_raid5_conf(conf); | |
4520 | return 0; | |
4521 | } | |
4522 | ||
4523 | static int raid5_remove_disk(mddev_t *mddev, int number) | |
4524 | { | |
4525 | raid5_conf_t *conf = mddev->private; | |
4526 | int err = 0; | |
4527 | mdk_rdev_t *rdev; | |
4528 | struct disk_info *p = conf->disks + number; | |
4529 | ||
4530 | print_raid5_conf(conf); | |
4531 | rdev = p->rdev; | |
4532 | if (rdev) { | |
b2d444d7 | 4533 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
4534 | atomic_read(&rdev->nr_pending)) { |
4535 | err = -EBUSY; | |
4536 | goto abort; | |
4537 | } | |
4538 | p->rdev = NULL; | |
fbd568a3 | 4539 | synchronize_rcu(); |
1da177e4 LT |
4540 | if (atomic_read(&rdev->nr_pending)) { |
4541 | /* lost the race, try later */ | |
4542 | err = -EBUSY; | |
4543 | p->rdev = rdev; | |
4544 | } | |
4545 | } | |
4546 | abort: | |
4547 | ||
4548 | print_raid5_conf(conf); | |
4549 | return err; | |
4550 | } | |
4551 | ||
4552 | static int raid5_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
4553 | { | |
4554 | raid5_conf_t *conf = mddev->private; | |
4555 | int found = 0; | |
4556 | int disk; | |
4557 | struct disk_info *p; | |
4558 | ||
16a53ecc | 4559 | if (mddev->degraded > conf->max_degraded) |
1da177e4 LT |
4560 | /* no point adding a device */ |
4561 | return 0; | |
4562 | ||
4563 | /* | |
16a53ecc N |
4564 | * find the disk ... but prefer rdev->saved_raid_disk |
4565 | * if possible. | |
1da177e4 | 4566 | */ |
16a53ecc N |
4567 | if (rdev->saved_raid_disk >= 0 && |
4568 | conf->disks[rdev->saved_raid_disk].rdev == NULL) | |
4569 | disk = rdev->saved_raid_disk; | |
4570 | else | |
4571 | disk = 0; | |
4572 | for ( ; disk < conf->raid_disks; disk++) | |
1da177e4 | 4573 | if ((p=conf->disks + disk)->rdev == NULL) { |
b2d444d7 | 4574 | clear_bit(In_sync, &rdev->flags); |
1da177e4 LT |
4575 | rdev->raid_disk = disk; |
4576 | found = 1; | |
72626685 N |
4577 | if (rdev->saved_raid_disk != disk) |
4578 | conf->fullsync = 1; | |
d6065f7b | 4579 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
4580 | break; |
4581 | } | |
4582 | print_raid5_conf(conf); | |
4583 | return found; | |
4584 | } | |
4585 | ||
4586 | static int raid5_resize(mddev_t *mddev, sector_t sectors) | |
4587 | { | |
4588 | /* no resync is happening, and there is enough space | |
4589 | * on all devices, so we can resize. | |
4590 | * We need to make sure resync covers any new space. | |
4591 | * If the array is shrinking we should possibly wait until | |
4592 | * any io in the removed space completes, but it hardly seems | |
4593 | * worth it. | |
4594 | */ | |
16a53ecc N |
4595 | raid5_conf_t *conf = mddev_to_conf(mddev); |
4596 | ||
1da177e4 | 4597 | sectors &= ~((sector_t)mddev->chunk_size/512 - 1); |
16a53ecc | 4598 | mddev->array_size = (sectors * (mddev->raid_disks-conf->max_degraded))>>1; |
1da177e4 | 4599 | set_capacity(mddev->gendisk, mddev->array_size << 1); |
44ce6294 | 4600 | mddev->changed = 1; |
1da177e4 LT |
4601 | if (sectors/2 > mddev->size && mddev->recovery_cp == MaxSector) { |
4602 | mddev->recovery_cp = mddev->size << 1; | |
4603 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4604 | } | |
4605 | mddev->size = sectors /2; | |
4b5c7ae8 | 4606 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
4607 | return 0; |
4608 | } | |
4609 | ||
29269553 | 4610 | #ifdef CONFIG_MD_RAID5_RESHAPE |
63c70c4f | 4611 | static int raid5_check_reshape(mddev_t *mddev) |
29269553 N |
4612 | { |
4613 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4614 | int err; | |
29269553 | 4615 | |
63c70c4f N |
4616 | if (mddev->delta_disks < 0 || |
4617 | mddev->new_level != mddev->level) | |
4618 | return -EINVAL; /* Cannot shrink array or change level yet */ | |
4619 | if (mddev->delta_disks == 0) | |
29269553 N |
4620 | return 0; /* nothing to do */ |
4621 | ||
4622 | /* Can only proceed if there are plenty of stripe_heads. | |
4623 | * We need a minimum of one full stripe,, and for sensible progress | |
4624 | * it is best to have about 4 times that. | |
4625 | * If we require 4 times, then the default 256 4K stripe_heads will | |
4626 | * allow for chunk sizes up to 256K, which is probably OK. | |
4627 | * If the chunk size is greater, user-space should request more | |
4628 | * stripe_heads first. | |
4629 | */ | |
63c70c4f N |
4630 | if ((mddev->chunk_size / STRIPE_SIZE) * 4 > conf->max_nr_stripes || |
4631 | (mddev->new_chunk / STRIPE_SIZE) * 4 > conf->max_nr_stripes) { | |
29269553 N |
4632 | printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n", |
4633 | (mddev->chunk_size / STRIPE_SIZE)*4); | |
4634 | return -ENOSPC; | |
4635 | } | |
4636 | ||
63c70c4f N |
4637 | err = resize_stripes(conf, conf->raid_disks + mddev->delta_disks); |
4638 | if (err) | |
4639 | return err; | |
4640 | ||
b4c4c7b8 N |
4641 | if (mddev->degraded > conf->max_degraded) |
4642 | return -EINVAL; | |
63c70c4f N |
4643 | /* looks like we might be able to manage this */ |
4644 | return 0; | |
4645 | } | |
4646 | ||
4647 | static int raid5_start_reshape(mddev_t *mddev) | |
4648 | { | |
4649 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4650 | mdk_rdev_t *rdev; | |
4651 | struct list_head *rtmp; | |
4652 | int spares = 0; | |
4653 | int added_devices = 0; | |
c04be0aa | 4654 | unsigned long flags; |
63c70c4f | 4655 | |
f416885e | 4656 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
4657 | return -EBUSY; |
4658 | ||
29269553 N |
4659 | ITERATE_RDEV(mddev, rdev, rtmp) |
4660 | if (rdev->raid_disk < 0 && | |
4661 | !test_bit(Faulty, &rdev->flags)) | |
4662 | spares++; | |
63c70c4f | 4663 | |
f416885e | 4664 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
4665 | /* Not enough devices even to make a degraded array |
4666 | * of that size | |
4667 | */ | |
4668 | return -EINVAL; | |
4669 | ||
f6705578 | 4670 | atomic_set(&conf->reshape_stripes, 0); |
29269553 N |
4671 | spin_lock_irq(&conf->device_lock); |
4672 | conf->previous_raid_disks = conf->raid_disks; | |
63c70c4f | 4673 | conf->raid_disks += mddev->delta_disks; |
29269553 | 4674 | conf->expand_progress = 0; |
b578d55f | 4675 | conf->expand_lo = 0; |
29269553 N |
4676 | spin_unlock_irq(&conf->device_lock); |
4677 | ||
4678 | /* Add some new drives, as many as will fit. | |
4679 | * We know there are enough to make the newly sized array work. | |
4680 | */ | |
4681 | ITERATE_RDEV(mddev, rdev, rtmp) | |
4682 | if (rdev->raid_disk < 0 && | |
4683 | !test_bit(Faulty, &rdev->flags)) { | |
4684 | if (raid5_add_disk(mddev, rdev)) { | |
4685 | char nm[20]; | |
4686 | set_bit(In_sync, &rdev->flags); | |
29269553 | 4687 | added_devices++; |
5fd6c1dc | 4688 | rdev->recovery_offset = 0; |
29269553 | 4689 | sprintf(nm, "rd%d", rdev->raid_disk); |
5e55e2f5 N |
4690 | if (sysfs_create_link(&mddev->kobj, |
4691 | &rdev->kobj, nm)) | |
4692 | printk(KERN_WARNING | |
4693 | "raid5: failed to create " | |
4694 | " link %s for %s\n", | |
4695 | nm, mdname(mddev)); | |
29269553 N |
4696 | } else |
4697 | break; | |
4698 | } | |
4699 | ||
c04be0aa | 4700 | spin_lock_irqsave(&conf->device_lock, flags); |
63c70c4f | 4701 | mddev->degraded = (conf->raid_disks - conf->previous_raid_disks) - added_devices; |
c04be0aa | 4702 | spin_unlock_irqrestore(&conf->device_lock, flags); |
63c70c4f | 4703 | mddev->raid_disks = conf->raid_disks; |
f6705578 | 4704 | mddev->reshape_position = 0; |
850b2b42 | 4705 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
f6705578 | 4706 | |
29269553 N |
4707 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
4708 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4709 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
4710 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4711 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
4712 | "%s_reshape"); | |
4713 | if (!mddev->sync_thread) { | |
4714 | mddev->recovery = 0; | |
4715 | spin_lock_irq(&conf->device_lock); | |
4716 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; | |
4717 | conf->expand_progress = MaxSector; | |
4718 | spin_unlock_irq(&conf->device_lock); | |
4719 | return -EAGAIN; | |
4720 | } | |
4721 | md_wakeup_thread(mddev->sync_thread); | |
4722 | md_new_event(mddev); | |
4723 | return 0; | |
4724 | } | |
4725 | #endif | |
4726 | ||
4727 | static void end_reshape(raid5_conf_t *conf) | |
4728 | { | |
4729 | struct block_device *bdev; | |
4730 | ||
f6705578 | 4731 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
f416885e N |
4732 | conf->mddev->array_size = conf->mddev->size * |
4733 | (conf->raid_disks - conf->max_degraded); | |
f6705578 | 4734 | set_capacity(conf->mddev->gendisk, conf->mddev->array_size << 1); |
44ce6294 | 4735 | conf->mddev->changed = 1; |
f6705578 N |
4736 | |
4737 | bdev = bdget_disk(conf->mddev->gendisk, 0); | |
4738 | if (bdev) { | |
4739 | mutex_lock(&bdev->bd_inode->i_mutex); | |
0692c6b1 | 4740 | i_size_write(bdev->bd_inode, (loff_t)conf->mddev->array_size << 10); |
f6705578 N |
4741 | mutex_unlock(&bdev->bd_inode->i_mutex); |
4742 | bdput(bdev); | |
4743 | } | |
4744 | spin_lock_irq(&conf->device_lock); | |
4745 | conf->expand_progress = MaxSector; | |
4746 | spin_unlock_irq(&conf->device_lock); | |
4747 | conf->mddev->reshape_position = MaxSector; | |
16a53ecc N |
4748 | |
4749 | /* read-ahead size must cover two whole stripes, which is | |
4750 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
4751 | */ | |
4752 | { | |
4753 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
4754 | int stripe = data_disks * | |
4755 | (conf->mddev->chunk_size / PAGE_SIZE); | |
4756 | if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) | |
4757 | conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
4758 | } | |
29269553 | 4759 | } |
29269553 N |
4760 | } |
4761 | ||
72626685 N |
4762 | static void raid5_quiesce(mddev_t *mddev, int state) |
4763 | { | |
4764 | raid5_conf_t *conf = mddev_to_conf(mddev); | |
4765 | ||
4766 | switch(state) { | |
e464eafd N |
4767 | case 2: /* resume for a suspend */ |
4768 | wake_up(&conf->wait_for_overlap); | |
4769 | break; | |
4770 | ||
72626685 N |
4771 | case 1: /* stop all writes */ |
4772 | spin_lock_irq(&conf->device_lock); | |
4773 | conf->quiesce = 1; | |
4774 | wait_event_lock_irq(conf->wait_for_stripe, | |
46031f9a RBJ |
4775 | atomic_read(&conf->active_stripes) == 0 && |
4776 | atomic_read(&conf->active_aligned_reads) == 0, | |
72626685 N |
4777 | conf->device_lock, /* nothing */); |
4778 | spin_unlock_irq(&conf->device_lock); | |
4779 | break; | |
4780 | ||
4781 | case 0: /* re-enable writes */ | |
4782 | spin_lock_irq(&conf->device_lock); | |
4783 | conf->quiesce = 0; | |
4784 | wake_up(&conf->wait_for_stripe); | |
e464eafd | 4785 | wake_up(&conf->wait_for_overlap); |
72626685 N |
4786 | spin_unlock_irq(&conf->device_lock); |
4787 | break; | |
4788 | } | |
72626685 | 4789 | } |
b15c2e57 | 4790 | |
16a53ecc N |
4791 | static struct mdk_personality raid6_personality = |
4792 | { | |
4793 | .name = "raid6", | |
4794 | .level = 6, | |
4795 | .owner = THIS_MODULE, | |
4796 | .make_request = make_request, | |
4797 | .run = run, | |
4798 | .stop = stop, | |
4799 | .status = status, | |
4800 | .error_handler = error, | |
4801 | .hot_add_disk = raid5_add_disk, | |
4802 | .hot_remove_disk= raid5_remove_disk, | |
4803 | .spare_active = raid5_spare_active, | |
4804 | .sync_request = sync_request, | |
4805 | .resize = raid5_resize, | |
f416885e N |
4806 | #ifdef CONFIG_MD_RAID5_RESHAPE |
4807 | .check_reshape = raid5_check_reshape, | |
4808 | .start_reshape = raid5_start_reshape, | |
4809 | #endif | |
16a53ecc N |
4810 | .quiesce = raid5_quiesce, |
4811 | }; | |
2604b703 | 4812 | static struct mdk_personality raid5_personality = |
1da177e4 LT |
4813 | { |
4814 | .name = "raid5", | |
2604b703 | 4815 | .level = 5, |
1da177e4 LT |
4816 | .owner = THIS_MODULE, |
4817 | .make_request = make_request, | |
4818 | .run = run, | |
4819 | .stop = stop, | |
4820 | .status = status, | |
4821 | .error_handler = error, | |
4822 | .hot_add_disk = raid5_add_disk, | |
4823 | .hot_remove_disk= raid5_remove_disk, | |
4824 | .spare_active = raid5_spare_active, | |
4825 | .sync_request = sync_request, | |
4826 | .resize = raid5_resize, | |
29269553 | 4827 | #ifdef CONFIG_MD_RAID5_RESHAPE |
63c70c4f N |
4828 | .check_reshape = raid5_check_reshape, |
4829 | .start_reshape = raid5_start_reshape, | |
29269553 | 4830 | #endif |
72626685 | 4831 | .quiesce = raid5_quiesce, |
1da177e4 LT |
4832 | }; |
4833 | ||
2604b703 | 4834 | static struct mdk_personality raid4_personality = |
1da177e4 | 4835 | { |
2604b703 N |
4836 | .name = "raid4", |
4837 | .level = 4, | |
4838 | .owner = THIS_MODULE, | |
4839 | .make_request = make_request, | |
4840 | .run = run, | |
4841 | .stop = stop, | |
4842 | .status = status, | |
4843 | .error_handler = error, | |
4844 | .hot_add_disk = raid5_add_disk, | |
4845 | .hot_remove_disk= raid5_remove_disk, | |
4846 | .spare_active = raid5_spare_active, | |
4847 | .sync_request = sync_request, | |
4848 | .resize = raid5_resize, | |
3d37890b N |
4849 | #ifdef CONFIG_MD_RAID5_RESHAPE |
4850 | .check_reshape = raid5_check_reshape, | |
4851 | .start_reshape = raid5_start_reshape, | |
4852 | #endif | |
2604b703 N |
4853 | .quiesce = raid5_quiesce, |
4854 | }; | |
4855 | ||
4856 | static int __init raid5_init(void) | |
4857 | { | |
16a53ecc N |
4858 | int e; |
4859 | ||
4860 | e = raid6_select_algo(); | |
4861 | if ( e ) | |
4862 | return e; | |
4863 | register_md_personality(&raid6_personality); | |
2604b703 N |
4864 | register_md_personality(&raid5_personality); |
4865 | register_md_personality(&raid4_personality); | |
4866 | return 0; | |
1da177e4 LT |
4867 | } |
4868 | ||
2604b703 | 4869 | static void raid5_exit(void) |
1da177e4 | 4870 | { |
16a53ecc | 4871 | unregister_md_personality(&raid6_personality); |
2604b703 N |
4872 | unregister_md_personality(&raid5_personality); |
4873 | unregister_md_personality(&raid4_personality); | |
1da177e4 LT |
4874 | } |
4875 | ||
4876 | module_init(raid5_init); | |
4877 | module_exit(raid5_exit); | |
4878 | MODULE_LICENSE("GPL"); | |
4879 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ | |
d9d166c2 N |
4880 | MODULE_ALIAS("md-raid5"); |
4881 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
4882 | MODULE_ALIAS("md-level-5"); |
4883 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
4884 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
4885 | MODULE_ALIAS("md-raid6"); | |
4886 | MODULE_ALIAS("md-level-6"); | |
4887 | ||
4888 | /* This used to be two separate modules, they were: */ | |
4889 | MODULE_ALIAS("raid5"); | |
4890 | MODULE_ALIAS("raid6"); |