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