Root/
1 | /* |
2 | * bio-integrity.c - bio data integrity extensions |
3 | * |
4 | * Copyright (C) 2007, 2008, 2009 Oracle Corporation |
5 | * Written by: Martin K. Petersen <martin.petersen@oracle.com> |
6 | * |
7 | * This program is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU General Public License version |
9 | * 2 as published by the Free Software Foundation. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, but |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; see the file COPYING. If not, write to |
18 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, |
19 | * USA. |
20 | * |
21 | */ |
22 | |
23 | #include <linux/blkdev.h> |
24 | #include <linux/mempool.h> |
25 | #include <linux/export.h> |
26 | #include <linux/bio.h> |
27 | #include <linux/workqueue.h> |
28 | #include <linux/slab.h> |
29 | |
30 | struct integrity_slab { |
31 | struct kmem_cache *slab; |
32 | unsigned short nr_vecs; |
33 | char name[8]; |
34 | }; |
35 | |
36 | #define IS(x) { .nr_vecs = x, .name = "bip-"__stringify(x) } |
37 | struct integrity_slab bip_slab[BIOVEC_NR_POOLS] __read_mostly = { |
38 | IS(1), IS(4), IS(16), IS(64), IS(128), IS(BIO_MAX_PAGES), |
39 | }; |
40 | #undef IS |
41 | |
42 | static struct workqueue_struct *kintegrityd_wq; |
43 | |
44 | static inline unsigned int vecs_to_idx(unsigned int nr) |
45 | { |
46 | switch (nr) { |
47 | case 1: |
48 | return 0; |
49 | case 2 ... 4: |
50 | return 1; |
51 | case 5 ... 16: |
52 | return 2; |
53 | case 17 ... 64: |
54 | return 3; |
55 | case 65 ... 128: |
56 | return 4; |
57 | case 129 ... BIO_MAX_PAGES: |
58 | return 5; |
59 | default: |
60 | BUG(); |
61 | } |
62 | } |
63 | |
64 | static inline int use_bip_pool(unsigned int idx) |
65 | { |
66 | if (idx == BIOVEC_MAX_IDX) |
67 | return 1; |
68 | |
69 | return 0; |
70 | } |
71 | |
72 | /** |
73 | * bio_integrity_alloc - Allocate integrity payload and attach it to bio |
74 | * @bio: bio to attach integrity metadata to |
75 | * @gfp_mask: Memory allocation mask |
76 | * @nr_vecs: Number of integrity metadata scatter-gather elements |
77 | * |
78 | * Description: This function prepares a bio for attaching integrity |
79 | * metadata. nr_vecs specifies the maximum number of pages containing |
80 | * integrity metadata that can be attached. |
81 | */ |
82 | struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, |
83 | gfp_t gfp_mask, |
84 | unsigned int nr_vecs) |
85 | { |
86 | struct bio_integrity_payload *bip; |
87 | unsigned int idx = vecs_to_idx(nr_vecs); |
88 | struct bio_set *bs = bio->bi_pool; |
89 | |
90 | if (!bs) |
91 | bs = fs_bio_set; |
92 | |
93 | BUG_ON(bio == NULL); |
94 | bip = NULL; |
95 | |
96 | /* Lower order allocations come straight from slab */ |
97 | if (!use_bip_pool(idx)) |
98 | bip = kmem_cache_alloc(bip_slab[idx].slab, gfp_mask); |
99 | |
100 | /* Use mempool if lower order alloc failed or max vecs were requested */ |
101 | if (bip == NULL) { |
102 | idx = BIOVEC_MAX_IDX; /* so we free the payload properly later */ |
103 | bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask); |
104 | |
105 | if (unlikely(bip == NULL)) { |
106 | printk(KERN_ERR "%s: could not alloc bip\n", __func__); |
107 | return NULL; |
108 | } |
109 | } |
110 | |
111 | memset(bip, 0, sizeof(*bip)); |
112 | |
113 | bip->bip_slab = idx; |
114 | bip->bip_bio = bio; |
115 | bio->bi_integrity = bip; |
116 | |
117 | return bip; |
118 | } |
119 | EXPORT_SYMBOL(bio_integrity_alloc); |
120 | |
121 | /** |
122 | * bio_integrity_free - Free bio integrity payload |
123 | * @bio: bio containing bip to be freed |
124 | * |
125 | * Description: Used to free the integrity portion of a bio. Usually |
126 | * called from bio_free(). |
127 | */ |
128 | void bio_integrity_free(struct bio *bio) |
129 | { |
130 | struct bio_integrity_payload *bip = bio->bi_integrity; |
131 | struct bio_set *bs = bio->bi_pool; |
132 | |
133 | if (!bs) |
134 | bs = fs_bio_set; |
135 | |
136 | BUG_ON(bip == NULL); |
137 | |
138 | /* A cloned bio doesn't own the integrity metadata */ |
139 | if (!bio_flagged(bio, BIO_CLONED) && !bio_flagged(bio, BIO_FS_INTEGRITY) |
140 | && bip->bip_buf != NULL) |
141 | kfree(bip->bip_buf); |
142 | |
143 | if (use_bip_pool(bip->bip_slab)) |
144 | mempool_free(bip, bs->bio_integrity_pool); |
145 | else |
146 | kmem_cache_free(bip_slab[bip->bip_slab].slab, bip); |
147 | |
148 | bio->bi_integrity = NULL; |
149 | } |
150 | EXPORT_SYMBOL(bio_integrity_free); |
151 | |
152 | /** |
153 | * bio_integrity_add_page - Attach integrity metadata |
154 | * @bio: bio to update |
155 | * @page: page containing integrity metadata |
156 | * @len: number of bytes of integrity metadata in page |
157 | * @offset: start offset within page |
158 | * |
159 | * Description: Attach a page containing integrity metadata to bio. |
160 | */ |
161 | int bio_integrity_add_page(struct bio *bio, struct page *page, |
162 | unsigned int len, unsigned int offset) |
163 | { |
164 | struct bio_integrity_payload *bip = bio->bi_integrity; |
165 | struct bio_vec *iv; |
166 | |
167 | if (bip->bip_vcnt >= bvec_nr_vecs(bip->bip_slab)) { |
168 | printk(KERN_ERR "%s: bip_vec full\n", __func__); |
169 | return 0; |
170 | } |
171 | |
172 | iv = bip_vec_idx(bip, bip->bip_vcnt); |
173 | BUG_ON(iv == NULL); |
174 | |
175 | iv->bv_page = page; |
176 | iv->bv_len = len; |
177 | iv->bv_offset = offset; |
178 | bip->bip_vcnt++; |
179 | |
180 | return len; |
181 | } |
182 | EXPORT_SYMBOL(bio_integrity_add_page); |
183 | |
184 | static int bdev_integrity_enabled(struct block_device *bdev, int rw) |
185 | { |
186 | struct blk_integrity *bi = bdev_get_integrity(bdev); |
187 | |
188 | if (bi == NULL) |
189 | return 0; |
190 | |
191 | if (rw == READ && bi->verify_fn != NULL && |
192 | (bi->flags & INTEGRITY_FLAG_READ)) |
193 | return 1; |
194 | |
195 | if (rw == WRITE && bi->generate_fn != NULL && |
196 | (bi->flags & INTEGRITY_FLAG_WRITE)) |
197 | return 1; |
198 | |
199 | return 0; |
200 | } |
201 | |
202 | /** |
203 | * bio_integrity_enabled - Check whether integrity can be passed |
204 | * @bio: bio to check |
205 | * |
206 | * Description: Determines whether bio_integrity_prep() can be called |
207 | * on this bio or not. bio data direction and target device must be |
208 | * set prior to calling. The functions honors the write_generate and |
209 | * read_verify flags in sysfs. |
210 | */ |
211 | int bio_integrity_enabled(struct bio *bio) |
212 | { |
213 | /* Already protected? */ |
214 | if (bio_integrity(bio)) |
215 | return 0; |
216 | |
217 | return bdev_integrity_enabled(bio->bi_bdev, bio_data_dir(bio)); |
218 | } |
219 | EXPORT_SYMBOL(bio_integrity_enabled); |
220 | |
221 | /** |
222 | * bio_integrity_hw_sectors - Convert 512b sectors to hardware ditto |
223 | * @bi: blk_integrity profile for device |
224 | * @sectors: Number of 512 sectors to convert |
225 | * |
226 | * Description: The block layer calculates everything in 512 byte |
227 | * sectors but integrity metadata is done in terms of the hardware |
228 | * sector size of the storage device. Convert the block layer sectors |
229 | * to physical sectors. |
230 | */ |
231 | static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi, |
232 | unsigned int sectors) |
233 | { |
234 | /* At this point there are only 512b or 4096b DIF/EPP devices */ |
235 | if (bi->sector_size == 4096) |
236 | return sectors >>= 3; |
237 | |
238 | return sectors; |
239 | } |
240 | |
241 | /** |
242 | * bio_integrity_tag_size - Retrieve integrity tag space |
243 | * @bio: bio to inspect |
244 | * |
245 | * Description: Returns the maximum number of tag bytes that can be |
246 | * attached to this bio. Filesystems can use this to determine how |
247 | * much metadata to attach to an I/O. |
248 | */ |
249 | unsigned int bio_integrity_tag_size(struct bio *bio) |
250 | { |
251 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
252 | |
253 | BUG_ON(bio->bi_size == 0); |
254 | |
255 | return bi->tag_size * (bio->bi_size / bi->sector_size); |
256 | } |
257 | EXPORT_SYMBOL(bio_integrity_tag_size); |
258 | |
259 | int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len, int set) |
260 | { |
261 | struct bio_integrity_payload *bip = bio->bi_integrity; |
262 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
263 | unsigned int nr_sectors; |
264 | |
265 | BUG_ON(bip->bip_buf == NULL); |
266 | |
267 | if (bi->tag_size == 0) |
268 | return -1; |
269 | |
270 | nr_sectors = bio_integrity_hw_sectors(bi, |
271 | DIV_ROUND_UP(len, bi->tag_size)); |
272 | |
273 | if (nr_sectors * bi->tuple_size > bip->bip_size) { |
274 | printk(KERN_ERR "%s: tag too big for bio: %u > %u\n", |
275 | __func__, nr_sectors * bi->tuple_size, bip->bip_size); |
276 | return -1; |
277 | } |
278 | |
279 | if (set) |
280 | bi->set_tag_fn(bip->bip_buf, tag_buf, nr_sectors); |
281 | else |
282 | bi->get_tag_fn(bip->bip_buf, tag_buf, nr_sectors); |
283 | |
284 | return 0; |
285 | } |
286 | |
287 | /** |
288 | * bio_integrity_set_tag - Attach a tag buffer to a bio |
289 | * @bio: bio to attach buffer to |
290 | * @tag_buf: Pointer to a buffer containing tag data |
291 | * @len: Length of the included buffer |
292 | * |
293 | * Description: Use this function to tag a bio by leveraging the extra |
294 | * space provided by devices formatted with integrity protection. The |
295 | * size of the integrity buffer must be <= to the size reported by |
296 | * bio_integrity_tag_size(). |
297 | */ |
298 | int bio_integrity_set_tag(struct bio *bio, void *tag_buf, unsigned int len) |
299 | { |
300 | BUG_ON(bio_data_dir(bio) != WRITE); |
301 | |
302 | return bio_integrity_tag(bio, tag_buf, len, 1); |
303 | } |
304 | EXPORT_SYMBOL(bio_integrity_set_tag); |
305 | |
306 | /** |
307 | * bio_integrity_get_tag - Retrieve a tag buffer from a bio |
308 | * @bio: bio to retrieve buffer from |
309 | * @tag_buf: Pointer to a buffer for the tag data |
310 | * @len: Length of the target buffer |
311 | * |
312 | * Description: Use this function to retrieve the tag buffer from a |
313 | * completed I/O. The size of the integrity buffer must be <= to the |
314 | * size reported by bio_integrity_tag_size(). |
315 | */ |
316 | int bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len) |
317 | { |
318 | BUG_ON(bio_data_dir(bio) != READ); |
319 | |
320 | return bio_integrity_tag(bio, tag_buf, len, 0); |
321 | } |
322 | EXPORT_SYMBOL(bio_integrity_get_tag); |
323 | |
324 | /** |
325 | * bio_integrity_generate - Generate integrity metadata for a bio |
326 | * @bio: bio to generate integrity metadata for |
327 | * |
328 | * Description: Generates integrity metadata for a bio by calling the |
329 | * block device's generation callback function. The bio must have a |
330 | * bip attached with enough room to accommodate the generated |
331 | * integrity metadata. |
332 | */ |
333 | static void bio_integrity_generate(struct bio *bio) |
334 | { |
335 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
336 | struct blk_integrity_exchg bix; |
337 | struct bio_vec *bv; |
338 | sector_t sector = bio->bi_sector; |
339 | unsigned int i, sectors, total; |
340 | void *prot_buf = bio->bi_integrity->bip_buf; |
341 | |
342 | total = 0; |
343 | bix.disk_name = bio->bi_bdev->bd_disk->disk_name; |
344 | bix.sector_size = bi->sector_size; |
345 | |
346 | bio_for_each_segment(bv, bio, i) { |
347 | void *kaddr = kmap_atomic(bv->bv_page); |
348 | bix.data_buf = kaddr + bv->bv_offset; |
349 | bix.data_size = bv->bv_len; |
350 | bix.prot_buf = prot_buf; |
351 | bix.sector = sector; |
352 | |
353 | bi->generate_fn(&bix); |
354 | |
355 | sectors = bv->bv_len / bi->sector_size; |
356 | sector += sectors; |
357 | prot_buf += sectors * bi->tuple_size; |
358 | total += sectors * bi->tuple_size; |
359 | BUG_ON(total > bio->bi_integrity->bip_size); |
360 | |
361 | kunmap_atomic(kaddr); |
362 | } |
363 | } |
364 | |
365 | static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi) |
366 | { |
367 | if (bi) |
368 | return bi->tuple_size; |
369 | |
370 | return 0; |
371 | } |
372 | |
373 | /** |
374 | * bio_integrity_prep - Prepare bio for integrity I/O |
375 | * @bio: bio to prepare |
376 | * |
377 | * Description: Allocates a buffer for integrity metadata, maps the |
378 | * pages and attaches them to a bio. The bio must have data |
379 | * direction, target device and start sector set priot to calling. In |
380 | * the WRITE case, integrity metadata will be generated using the |
381 | * block device's integrity function. In the READ case, the buffer |
382 | * will be prepared for DMA and a suitable end_io handler set up. |
383 | */ |
384 | int bio_integrity_prep(struct bio *bio) |
385 | { |
386 | struct bio_integrity_payload *bip; |
387 | struct blk_integrity *bi; |
388 | struct request_queue *q; |
389 | void *buf; |
390 | unsigned long start, end; |
391 | unsigned int len, nr_pages; |
392 | unsigned int bytes, offset, i; |
393 | unsigned int sectors; |
394 | |
395 | bi = bdev_get_integrity(bio->bi_bdev); |
396 | q = bdev_get_queue(bio->bi_bdev); |
397 | BUG_ON(bi == NULL); |
398 | BUG_ON(bio_integrity(bio)); |
399 | |
400 | sectors = bio_integrity_hw_sectors(bi, bio_sectors(bio)); |
401 | |
402 | /* Allocate kernel buffer for protection data */ |
403 | len = sectors * blk_integrity_tuple_size(bi); |
404 | buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); |
405 | if (unlikely(buf == NULL)) { |
406 | printk(KERN_ERR "could not allocate integrity buffer\n"); |
407 | return -ENOMEM; |
408 | } |
409 | |
410 | end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
411 | start = ((unsigned long) buf) >> PAGE_SHIFT; |
412 | nr_pages = end - start; |
413 | |
414 | /* Allocate bio integrity payload and integrity vectors */ |
415 | bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); |
416 | if (unlikely(bip == NULL)) { |
417 | printk(KERN_ERR "could not allocate data integrity bioset\n"); |
418 | kfree(buf); |
419 | return -EIO; |
420 | } |
421 | |
422 | bip->bip_buf = buf; |
423 | bip->bip_size = len; |
424 | bip->bip_sector = bio->bi_sector; |
425 | |
426 | /* Map it */ |
427 | offset = offset_in_page(buf); |
428 | for (i = 0 ; i < nr_pages ; i++) { |
429 | int ret; |
430 | bytes = PAGE_SIZE - offset; |
431 | |
432 | if (len <= 0) |
433 | break; |
434 | |
435 | if (bytes > len) |
436 | bytes = len; |
437 | |
438 | ret = bio_integrity_add_page(bio, virt_to_page(buf), |
439 | bytes, offset); |
440 | |
441 | if (ret == 0) |
442 | return 0; |
443 | |
444 | if (ret < bytes) |
445 | break; |
446 | |
447 | buf += bytes; |
448 | len -= bytes; |
449 | offset = 0; |
450 | } |
451 | |
452 | /* Install custom I/O completion handler if read verify is enabled */ |
453 | if (bio_data_dir(bio) == READ) { |
454 | bip->bip_end_io = bio->bi_end_io; |
455 | bio->bi_end_io = bio_integrity_endio; |
456 | } |
457 | |
458 | /* Auto-generate integrity metadata if this is a write */ |
459 | if (bio_data_dir(bio) == WRITE) |
460 | bio_integrity_generate(bio); |
461 | |
462 | return 0; |
463 | } |
464 | EXPORT_SYMBOL(bio_integrity_prep); |
465 | |
466 | /** |
467 | * bio_integrity_verify - Verify integrity metadata for a bio |
468 | * @bio: bio to verify |
469 | * |
470 | * Description: This function is called to verify the integrity of a |
471 | * bio. The data in the bio io_vec is compared to the integrity |
472 | * metadata returned by the HBA. |
473 | */ |
474 | static int bio_integrity_verify(struct bio *bio) |
475 | { |
476 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
477 | struct blk_integrity_exchg bix; |
478 | struct bio_vec *bv; |
479 | sector_t sector = bio->bi_integrity->bip_sector; |
480 | unsigned int i, sectors, total, ret; |
481 | void *prot_buf = bio->bi_integrity->bip_buf; |
482 | |
483 | ret = total = 0; |
484 | bix.disk_name = bio->bi_bdev->bd_disk->disk_name; |
485 | bix.sector_size = bi->sector_size; |
486 | |
487 | bio_for_each_segment(bv, bio, i) { |
488 | void *kaddr = kmap_atomic(bv->bv_page); |
489 | bix.data_buf = kaddr + bv->bv_offset; |
490 | bix.data_size = bv->bv_len; |
491 | bix.prot_buf = prot_buf; |
492 | bix.sector = sector; |
493 | |
494 | ret = bi->verify_fn(&bix); |
495 | |
496 | if (ret) { |
497 | kunmap_atomic(kaddr); |
498 | return ret; |
499 | } |
500 | |
501 | sectors = bv->bv_len / bi->sector_size; |
502 | sector += sectors; |
503 | prot_buf += sectors * bi->tuple_size; |
504 | total += sectors * bi->tuple_size; |
505 | BUG_ON(total > bio->bi_integrity->bip_size); |
506 | |
507 | kunmap_atomic(kaddr); |
508 | } |
509 | |
510 | return ret; |
511 | } |
512 | |
513 | /** |
514 | * bio_integrity_verify_fn - Integrity I/O completion worker |
515 | * @work: Work struct stored in bio to be verified |
516 | * |
517 | * Description: This workqueue function is called to complete a READ |
518 | * request. The function verifies the transferred integrity metadata |
519 | * and then calls the original bio end_io function. |
520 | */ |
521 | static void bio_integrity_verify_fn(struct work_struct *work) |
522 | { |
523 | struct bio_integrity_payload *bip = |
524 | container_of(work, struct bio_integrity_payload, bip_work); |
525 | struct bio *bio = bip->bip_bio; |
526 | int error; |
527 | |
528 | error = bio_integrity_verify(bio); |
529 | |
530 | /* Restore original bio completion handler */ |
531 | bio->bi_end_io = bip->bip_end_io; |
532 | bio_endio(bio, error); |
533 | } |
534 | |
535 | /** |
536 | * bio_integrity_endio - Integrity I/O completion function |
537 | * @bio: Protected bio |
538 | * @error: Pointer to errno |
539 | * |
540 | * Description: Completion for integrity I/O |
541 | * |
542 | * Normally I/O completion is done in interrupt context. However, |
543 | * verifying I/O integrity is a time-consuming task which must be run |
544 | * in process context. This function postpones completion |
545 | * accordingly. |
546 | */ |
547 | void bio_integrity_endio(struct bio *bio, int error) |
548 | { |
549 | struct bio_integrity_payload *bip = bio->bi_integrity; |
550 | |
551 | BUG_ON(bip->bip_bio != bio); |
552 | |
553 | /* In case of an I/O error there is no point in verifying the |
554 | * integrity metadata. Restore original bio end_io handler |
555 | * and run it. |
556 | */ |
557 | if (error) { |
558 | bio->bi_end_io = bip->bip_end_io; |
559 | bio_endio(bio, error); |
560 | |
561 | return; |
562 | } |
563 | |
564 | INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); |
565 | queue_work(kintegrityd_wq, &bip->bip_work); |
566 | } |
567 | EXPORT_SYMBOL(bio_integrity_endio); |
568 | |
569 | /** |
570 | * bio_integrity_mark_head - Advance bip_vec skip bytes |
571 | * @bip: Integrity vector to advance |
572 | * @skip: Number of bytes to advance it |
573 | */ |
574 | void bio_integrity_mark_head(struct bio_integrity_payload *bip, |
575 | unsigned int skip) |
576 | { |
577 | struct bio_vec *iv; |
578 | unsigned int i; |
579 | |
580 | bip_for_each_vec(iv, bip, i) { |
581 | if (skip == 0) { |
582 | bip->bip_idx = i; |
583 | return; |
584 | } else if (skip >= iv->bv_len) { |
585 | skip -= iv->bv_len; |
586 | } else { /* skip < iv->bv_len) */ |
587 | iv->bv_offset += skip; |
588 | iv->bv_len -= skip; |
589 | bip->bip_idx = i; |
590 | return; |
591 | } |
592 | } |
593 | } |
594 | |
595 | /** |
596 | * bio_integrity_mark_tail - Truncate bip_vec to be len bytes long |
597 | * @bip: Integrity vector to truncate |
598 | * @len: New length of integrity vector |
599 | */ |
600 | void bio_integrity_mark_tail(struct bio_integrity_payload *bip, |
601 | unsigned int len) |
602 | { |
603 | struct bio_vec *iv; |
604 | unsigned int i; |
605 | |
606 | bip_for_each_vec(iv, bip, i) { |
607 | if (len == 0) { |
608 | bip->bip_vcnt = i; |
609 | return; |
610 | } else if (len >= iv->bv_len) { |
611 | len -= iv->bv_len; |
612 | } else { /* len < iv->bv_len) */ |
613 | iv->bv_len = len; |
614 | len = 0; |
615 | } |
616 | } |
617 | } |
618 | |
619 | /** |
620 | * bio_integrity_advance - Advance integrity vector |
621 | * @bio: bio whose integrity vector to update |
622 | * @bytes_done: number of data bytes that have been completed |
623 | * |
624 | * Description: This function calculates how many integrity bytes the |
625 | * number of completed data bytes correspond to and advances the |
626 | * integrity vector accordingly. |
627 | */ |
628 | void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) |
629 | { |
630 | struct bio_integrity_payload *bip = bio->bi_integrity; |
631 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
632 | unsigned int nr_sectors; |
633 | |
634 | BUG_ON(bip == NULL); |
635 | BUG_ON(bi == NULL); |
636 | |
637 | nr_sectors = bio_integrity_hw_sectors(bi, bytes_done >> 9); |
638 | bio_integrity_mark_head(bip, nr_sectors * bi->tuple_size); |
639 | } |
640 | EXPORT_SYMBOL(bio_integrity_advance); |
641 | |
642 | /** |
643 | * bio_integrity_trim - Trim integrity vector |
644 | * @bio: bio whose integrity vector to update |
645 | * @offset: offset to first data sector |
646 | * @sectors: number of data sectors |
647 | * |
648 | * Description: Used to trim the integrity vector in a cloned bio. |
649 | * The ivec will be advanced corresponding to 'offset' data sectors |
650 | * and the length will be truncated corresponding to 'len' data |
651 | * sectors. |
652 | */ |
653 | void bio_integrity_trim(struct bio *bio, unsigned int offset, |
654 | unsigned int sectors) |
655 | { |
656 | struct bio_integrity_payload *bip = bio->bi_integrity; |
657 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
658 | unsigned int nr_sectors; |
659 | |
660 | BUG_ON(bip == NULL); |
661 | BUG_ON(bi == NULL); |
662 | BUG_ON(!bio_flagged(bio, BIO_CLONED)); |
663 | |
664 | nr_sectors = bio_integrity_hw_sectors(bi, sectors); |
665 | bip->bip_sector = bip->bip_sector + offset; |
666 | bio_integrity_mark_head(bip, offset * bi->tuple_size); |
667 | bio_integrity_mark_tail(bip, sectors * bi->tuple_size); |
668 | } |
669 | EXPORT_SYMBOL(bio_integrity_trim); |
670 | |
671 | /** |
672 | * bio_integrity_split - Split integrity metadata |
673 | * @bio: Protected bio |
674 | * @bp: Resulting bio_pair |
675 | * @sectors: Offset |
676 | * |
677 | * Description: Splits an integrity page into a bio_pair. |
678 | */ |
679 | void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors) |
680 | { |
681 | struct blk_integrity *bi; |
682 | struct bio_integrity_payload *bip = bio->bi_integrity; |
683 | unsigned int nr_sectors; |
684 | |
685 | if (bio_integrity(bio) == 0) |
686 | return; |
687 | |
688 | bi = bdev_get_integrity(bio->bi_bdev); |
689 | BUG_ON(bi == NULL); |
690 | BUG_ON(bip->bip_vcnt != 1); |
691 | |
692 | nr_sectors = bio_integrity_hw_sectors(bi, sectors); |
693 | |
694 | bp->bio1.bi_integrity = &bp->bip1; |
695 | bp->bio2.bi_integrity = &bp->bip2; |
696 | |
697 | bp->iv1 = bip->bip_vec[0]; |
698 | bp->iv2 = bip->bip_vec[0]; |
699 | |
700 | bp->bip1.bip_vec[0] = bp->iv1; |
701 | bp->bip2.bip_vec[0] = bp->iv2; |
702 | |
703 | bp->iv1.bv_len = sectors * bi->tuple_size; |
704 | bp->iv2.bv_offset += sectors * bi->tuple_size; |
705 | bp->iv2.bv_len -= sectors * bi->tuple_size; |
706 | |
707 | bp->bip1.bip_sector = bio->bi_integrity->bip_sector; |
708 | bp->bip2.bip_sector = bio->bi_integrity->bip_sector + nr_sectors; |
709 | |
710 | bp->bip1.bip_vcnt = bp->bip2.bip_vcnt = 1; |
711 | bp->bip1.bip_idx = bp->bip2.bip_idx = 0; |
712 | } |
713 | EXPORT_SYMBOL(bio_integrity_split); |
714 | |
715 | /** |
716 | * bio_integrity_clone - Callback for cloning bios with integrity metadata |
717 | * @bio: New bio |
718 | * @bio_src: Original bio |
719 | * @gfp_mask: Memory allocation mask |
720 | * |
721 | * Description: Called to allocate a bip when cloning a bio |
722 | */ |
723 | int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
724 | gfp_t gfp_mask) |
725 | { |
726 | struct bio_integrity_payload *bip_src = bio_src->bi_integrity; |
727 | struct bio_integrity_payload *bip; |
728 | |
729 | BUG_ON(bip_src == NULL); |
730 | |
731 | bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); |
732 | |
733 | if (bip == NULL) |
734 | return -EIO; |
735 | |
736 | memcpy(bip->bip_vec, bip_src->bip_vec, |
737 | bip_src->bip_vcnt * sizeof(struct bio_vec)); |
738 | |
739 | bip->bip_sector = bip_src->bip_sector; |
740 | bip->bip_vcnt = bip_src->bip_vcnt; |
741 | bip->bip_idx = bip_src->bip_idx; |
742 | |
743 | return 0; |
744 | } |
745 | EXPORT_SYMBOL(bio_integrity_clone); |
746 | |
747 | int bioset_integrity_create(struct bio_set *bs, int pool_size) |
748 | { |
749 | unsigned int max_slab = vecs_to_idx(BIO_MAX_PAGES); |
750 | |
751 | if (bs->bio_integrity_pool) |
752 | return 0; |
753 | |
754 | bs->bio_integrity_pool = |
755 | mempool_create_slab_pool(pool_size, bip_slab[max_slab].slab); |
756 | |
757 | if (!bs->bio_integrity_pool) |
758 | return -1; |
759 | |
760 | return 0; |
761 | } |
762 | EXPORT_SYMBOL(bioset_integrity_create); |
763 | |
764 | void bioset_integrity_free(struct bio_set *bs) |
765 | { |
766 | if (bs->bio_integrity_pool) |
767 | mempool_destroy(bs->bio_integrity_pool); |
768 | } |
769 | EXPORT_SYMBOL(bioset_integrity_free); |
770 | |
771 | void __init bio_integrity_init(void) |
772 | { |
773 | unsigned int i; |
774 | |
775 | /* |
776 | * kintegrityd won't block much but may burn a lot of CPU cycles. |
777 | * Make it highpri CPU intensive wq with max concurrency of 1. |
778 | */ |
779 | kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM | |
780 | WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1); |
781 | if (!kintegrityd_wq) |
782 | panic("Failed to create kintegrityd\n"); |
783 | |
784 | for (i = 0 ; i < BIOVEC_NR_POOLS ; i++) { |
785 | unsigned int size; |
786 | |
787 | size = sizeof(struct bio_integrity_payload) |
788 | + bip_slab[i].nr_vecs * sizeof(struct bio_vec); |
789 | |
790 | bip_slab[i].slab = |
791 | kmem_cache_create(bip_slab[i].name, size, 0, |
792 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
793 | } |
794 | } |
795 |
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v2.6.34-rc5
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