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7ba1ba12 MP |
1 | /* |
2 | * bio-integrity.c - bio data integrity extensions | |
3 | * | |
4 | * Copyright (C) 2007, 2008 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/bio.h> | |
26 | #include <linux/workqueue.h> | |
27 | ||
28 | static struct kmem_cache *bio_integrity_slab __read_mostly; | |
6d2a78e7 MP |
29 | static mempool_t *bio_integrity_pool; |
30 | static struct bio_set *integrity_bio_set; | |
7ba1ba12 MP |
31 | static struct workqueue_struct *kintegrityd_wq; |
32 | ||
33 | /** | |
6d2a78e7 | 34 | * bio_integrity_alloc - Allocate integrity payload and attach it to bio |
7ba1ba12 MP |
35 | * @bio: bio to attach integrity metadata to |
36 | * @gfp_mask: Memory allocation mask | |
37 | * @nr_vecs: Number of integrity metadata scatter-gather elements | |
7ba1ba12 MP |
38 | * |
39 | * Description: This function prepares a bio for attaching integrity | |
40 | * metadata. nr_vecs specifies the maximum number of pages containing | |
41 | * integrity metadata that can be attached. | |
42 | */ | |
6d2a78e7 MP |
43 | struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, |
44 | gfp_t gfp_mask, | |
45 | unsigned int nr_vecs) | |
7ba1ba12 MP |
46 | { |
47 | struct bio_integrity_payload *bip; | |
48 | struct bio_vec *iv; | |
49 | unsigned long idx; | |
50 | ||
51 | BUG_ON(bio == NULL); | |
52 | ||
6d2a78e7 | 53 | bip = mempool_alloc(bio_integrity_pool, gfp_mask); |
7ba1ba12 MP |
54 | if (unlikely(bip == NULL)) { |
55 | printk(KERN_ERR "%s: could not alloc bip\n", __func__); | |
56 | return NULL; | |
57 | } | |
58 | ||
59 | memset(bip, 0, sizeof(*bip)); | |
60 | ||
6d2a78e7 | 61 | iv = bvec_alloc_bs(gfp_mask, nr_vecs, &idx, integrity_bio_set); |
7ba1ba12 MP |
62 | if (unlikely(iv == NULL)) { |
63 | printk(KERN_ERR "%s: could not alloc bip_vec\n", __func__); | |
6d2a78e7 | 64 | mempool_free(bip, bio_integrity_pool); |
7ba1ba12 MP |
65 | return NULL; |
66 | } | |
67 | ||
68 | bip->bip_pool = idx; | |
69 | bip->bip_vec = iv; | |
70 | bip->bip_bio = bio; | |
71 | bio->bi_integrity = bip; | |
72 | ||
73 | return bip; | |
74 | } | |
7ba1ba12 MP |
75 | EXPORT_SYMBOL(bio_integrity_alloc); |
76 | ||
77 | /** | |
78 | * bio_integrity_free - Free bio integrity payload | |
79 | * @bio: bio containing bip to be freed | |
7ba1ba12 MP |
80 | * |
81 | * Description: Used to free the integrity portion of a bio. Usually | |
82 | * called from bio_free(). | |
83 | */ | |
6d2a78e7 | 84 | void bio_integrity_free(struct bio *bio) |
7ba1ba12 MP |
85 | { |
86 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
87 | ||
88 | BUG_ON(bip == NULL); | |
89 | ||
90 | /* A cloned bio doesn't own the integrity metadata */ | |
74aa8c2c MP |
91 | if (!bio_flagged(bio, BIO_CLONED) && !bio_flagged(bio, BIO_FS_INTEGRITY) |
92 | && bip->bip_buf != NULL) | |
7ba1ba12 MP |
93 | kfree(bip->bip_buf); |
94 | ||
6d2a78e7 MP |
95 | bvec_free_bs(integrity_bio_set, bip->bip_vec, bip->bip_pool); |
96 | mempool_free(bip, bio_integrity_pool); | |
7ba1ba12 MP |
97 | |
98 | bio->bi_integrity = NULL; | |
99 | } | |
100 | EXPORT_SYMBOL(bio_integrity_free); | |
101 | ||
102 | /** | |
103 | * bio_integrity_add_page - Attach integrity metadata | |
104 | * @bio: bio to update | |
105 | * @page: page containing integrity metadata | |
106 | * @len: number of bytes of integrity metadata in page | |
107 | * @offset: start offset within page | |
108 | * | |
109 | * Description: Attach a page containing integrity metadata to bio. | |
110 | */ | |
111 | int bio_integrity_add_page(struct bio *bio, struct page *page, | |
112 | unsigned int len, unsigned int offset) | |
113 | { | |
114 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
115 | struct bio_vec *iv; | |
116 | ||
117 | if (bip->bip_vcnt >= bvec_nr_vecs(bip->bip_pool)) { | |
118 | printk(KERN_ERR "%s: bip_vec full\n", __func__); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | iv = bip_vec_idx(bip, bip->bip_vcnt); | |
123 | BUG_ON(iv == NULL); | |
7ba1ba12 MP |
124 | |
125 | iv->bv_page = page; | |
126 | iv->bv_len = len; | |
127 | iv->bv_offset = offset; | |
128 | bip->bip_vcnt++; | |
129 | ||
130 | return len; | |
131 | } | |
132 | EXPORT_SYMBOL(bio_integrity_add_page); | |
133 | ||
9c02f2b0 JA |
134 | static int bdev_integrity_enabled(struct block_device *bdev, int rw) |
135 | { | |
136 | struct blk_integrity *bi = bdev_get_integrity(bdev); | |
137 | ||
138 | if (bi == NULL) | |
139 | return 0; | |
140 | ||
141 | if (rw == READ && bi->verify_fn != NULL && | |
142 | (bi->flags & INTEGRITY_FLAG_READ)) | |
143 | return 1; | |
144 | ||
145 | if (rw == WRITE && bi->generate_fn != NULL && | |
146 | (bi->flags & INTEGRITY_FLAG_WRITE)) | |
147 | return 1; | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
7ba1ba12 MP |
152 | /** |
153 | * bio_integrity_enabled - Check whether integrity can be passed | |
154 | * @bio: bio to check | |
155 | * | |
156 | * Description: Determines whether bio_integrity_prep() can be called | |
157 | * on this bio or not. bio data direction and target device must be | |
158 | * set prior to calling. The functions honors the write_generate and | |
159 | * read_verify flags in sysfs. | |
160 | */ | |
161 | int bio_integrity_enabled(struct bio *bio) | |
162 | { | |
163 | /* Already protected? */ | |
164 | if (bio_integrity(bio)) | |
165 | return 0; | |
166 | ||
167 | return bdev_integrity_enabled(bio->bi_bdev, bio_data_dir(bio)); | |
168 | } | |
169 | EXPORT_SYMBOL(bio_integrity_enabled); | |
170 | ||
171 | /** | |
172 | * bio_integrity_hw_sectors - Convert 512b sectors to hardware ditto | |
173 | * @bi: blk_integrity profile for device | |
174 | * @sectors: Number of 512 sectors to convert | |
175 | * | |
176 | * Description: The block layer calculates everything in 512 byte | |
177 | * sectors but integrity metadata is done in terms of the hardware | |
178 | * sector size of the storage device. Convert the block layer sectors | |
179 | * to physical sectors. | |
180 | */ | |
b984679e JA |
181 | static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi, |
182 | unsigned int sectors) | |
7ba1ba12 MP |
183 | { |
184 | /* At this point there are only 512b or 4096b DIF/EPP devices */ | |
185 | if (bi->sector_size == 4096) | |
186 | return sectors >>= 3; | |
187 | ||
188 | return sectors; | |
189 | } | |
190 | ||
191 | /** | |
192 | * bio_integrity_tag_size - Retrieve integrity tag space | |
193 | * @bio: bio to inspect | |
194 | * | |
195 | * Description: Returns the maximum number of tag bytes that can be | |
196 | * attached to this bio. Filesystems can use this to determine how | |
197 | * much metadata to attach to an I/O. | |
198 | */ | |
199 | unsigned int bio_integrity_tag_size(struct bio *bio) | |
200 | { | |
201 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
202 | ||
203 | BUG_ON(bio->bi_size == 0); | |
204 | ||
205 | return bi->tag_size * (bio->bi_size / bi->sector_size); | |
206 | } | |
207 | EXPORT_SYMBOL(bio_integrity_tag_size); | |
208 | ||
209 | int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len, int set) | |
210 | { | |
211 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
212 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
213 | unsigned int nr_sectors; | |
214 | ||
215 | BUG_ON(bip->bip_buf == NULL); | |
216 | ||
217 | if (bi->tag_size == 0) | |
218 | return -1; | |
219 | ||
b984679e JA |
220 | nr_sectors = bio_integrity_hw_sectors(bi, |
221 | DIV_ROUND_UP(len, bi->tag_size)); | |
7ba1ba12 MP |
222 | |
223 | if (nr_sectors * bi->tuple_size > bip->bip_size) { | |
224 | printk(KERN_ERR "%s: tag too big for bio: %u > %u\n", | |
225 | __func__, nr_sectors * bi->tuple_size, bip->bip_size); | |
226 | return -1; | |
227 | } | |
228 | ||
229 | if (set) | |
230 | bi->set_tag_fn(bip->bip_buf, tag_buf, nr_sectors); | |
231 | else | |
232 | bi->get_tag_fn(bip->bip_buf, tag_buf, nr_sectors); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | /** | |
238 | * bio_integrity_set_tag - Attach a tag buffer to a bio | |
239 | * @bio: bio to attach buffer to | |
240 | * @tag_buf: Pointer to a buffer containing tag data | |
241 | * @len: Length of the included buffer | |
242 | * | |
243 | * Description: Use this function to tag a bio by leveraging the extra | |
244 | * space provided by devices formatted with integrity protection. The | |
245 | * size of the integrity buffer must be <= to the size reported by | |
246 | * bio_integrity_tag_size(). | |
247 | */ | |
248 | int bio_integrity_set_tag(struct bio *bio, void *tag_buf, unsigned int len) | |
249 | { | |
250 | BUG_ON(bio_data_dir(bio) != WRITE); | |
251 | ||
252 | return bio_integrity_tag(bio, tag_buf, len, 1); | |
253 | } | |
254 | EXPORT_SYMBOL(bio_integrity_set_tag); | |
255 | ||
256 | /** | |
257 | * bio_integrity_get_tag - Retrieve a tag buffer from a bio | |
258 | * @bio: bio to retrieve buffer from | |
259 | * @tag_buf: Pointer to a buffer for the tag data | |
260 | * @len: Length of the target buffer | |
261 | * | |
262 | * Description: Use this function to retrieve the tag buffer from a | |
263 | * completed I/O. The size of the integrity buffer must be <= to the | |
264 | * size reported by bio_integrity_tag_size(). | |
265 | */ | |
266 | int bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len) | |
267 | { | |
268 | BUG_ON(bio_data_dir(bio) != READ); | |
269 | ||
270 | return bio_integrity_tag(bio, tag_buf, len, 0); | |
271 | } | |
272 | EXPORT_SYMBOL(bio_integrity_get_tag); | |
273 | ||
274 | /** | |
275 | * bio_integrity_generate - Generate integrity metadata for a bio | |
276 | * @bio: bio to generate integrity metadata for | |
277 | * | |
278 | * Description: Generates integrity metadata for a bio by calling the | |
279 | * block device's generation callback function. The bio must have a | |
280 | * bip attached with enough room to accommodate the generated | |
281 | * integrity metadata. | |
282 | */ | |
283 | static void bio_integrity_generate(struct bio *bio) | |
284 | { | |
285 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
286 | struct blk_integrity_exchg bix; | |
287 | struct bio_vec *bv; | |
288 | sector_t sector = bio->bi_sector; | |
289 | unsigned int i, sectors, total; | |
290 | void *prot_buf = bio->bi_integrity->bip_buf; | |
291 | ||
292 | total = 0; | |
293 | bix.disk_name = bio->bi_bdev->bd_disk->disk_name; | |
294 | bix.sector_size = bi->sector_size; | |
295 | ||
296 | bio_for_each_segment(bv, bio, i) { | |
297 | void *kaddr = kmap_atomic(bv->bv_page, KM_USER0); | |
298 | bix.data_buf = kaddr + bv->bv_offset; | |
299 | bix.data_size = bv->bv_len; | |
300 | bix.prot_buf = prot_buf; | |
301 | bix.sector = sector; | |
302 | ||
303 | bi->generate_fn(&bix); | |
304 | ||
305 | sectors = bv->bv_len / bi->sector_size; | |
306 | sector += sectors; | |
307 | prot_buf += sectors * bi->tuple_size; | |
308 | total += sectors * bi->tuple_size; | |
309 | BUG_ON(total > bio->bi_integrity->bip_size); | |
310 | ||
311 | kunmap_atomic(kaddr, KM_USER0); | |
312 | } | |
313 | } | |
314 | ||
9c02f2b0 JA |
315 | static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi) |
316 | { | |
317 | if (bi) | |
318 | return bi->tuple_size; | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
7ba1ba12 MP |
323 | /** |
324 | * bio_integrity_prep - Prepare bio for integrity I/O | |
325 | * @bio: bio to prepare | |
326 | * | |
327 | * Description: Allocates a buffer for integrity metadata, maps the | |
328 | * pages and attaches them to a bio. The bio must have data | |
329 | * direction, target device and start sector set priot to calling. In | |
330 | * the WRITE case, integrity metadata will be generated using the | |
331 | * block device's integrity function. In the READ case, the buffer | |
332 | * will be prepared for DMA and a suitable end_io handler set up. | |
333 | */ | |
334 | int bio_integrity_prep(struct bio *bio) | |
335 | { | |
336 | struct bio_integrity_payload *bip; | |
337 | struct blk_integrity *bi; | |
338 | struct request_queue *q; | |
339 | void *buf; | |
340 | unsigned long start, end; | |
341 | unsigned int len, nr_pages; | |
342 | unsigned int bytes, offset, i; | |
343 | unsigned int sectors; | |
344 | ||
345 | bi = bdev_get_integrity(bio->bi_bdev); | |
346 | q = bdev_get_queue(bio->bi_bdev); | |
347 | BUG_ON(bi == NULL); | |
348 | BUG_ON(bio_integrity(bio)); | |
349 | ||
350 | sectors = bio_integrity_hw_sectors(bi, bio_sectors(bio)); | |
351 | ||
352 | /* Allocate kernel buffer for protection data */ | |
353 | len = sectors * blk_integrity_tuple_size(bi); | |
354 | buf = kmalloc(len, GFP_NOIO | __GFP_NOFAIL | q->bounce_gfp); | |
355 | if (unlikely(buf == NULL)) { | |
356 | printk(KERN_ERR "could not allocate integrity buffer\n"); | |
357 | return -EIO; | |
358 | } | |
359 | ||
360 | end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
361 | start = ((unsigned long) buf) >> PAGE_SHIFT; | |
362 | nr_pages = end - start; | |
363 | ||
364 | /* Allocate bio integrity payload and integrity vectors */ | |
365 | bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); | |
366 | if (unlikely(bip == NULL)) { | |
367 | printk(KERN_ERR "could not allocate data integrity bioset\n"); | |
368 | kfree(buf); | |
369 | return -EIO; | |
370 | } | |
371 | ||
372 | bip->bip_buf = buf; | |
373 | bip->bip_size = len; | |
374 | bip->bip_sector = bio->bi_sector; | |
375 | ||
376 | /* Map it */ | |
377 | offset = offset_in_page(buf); | |
378 | for (i = 0 ; i < nr_pages ; i++) { | |
379 | int ret; | |
380 | bytes = PAGE_SIZE - offset; | |
381 | ||
382 | if (len <= 0) | |
383 | break; | |
384 | ||
385 | if (bytes > len) | |
386 | bytes = len; | |
387 | ||
388 | ret = bio_integrity_add_page(bio, virt_to_page(buf), | |
389 | bytes, offset); | |
390 | ||
391 | if (ret == 0) | |
392 | return 0; | |
393 | ||
394 | if (ret < bytes) | |
395 | break; | |
396 | ||
397 | buf += bytes; | |
398 | len -= bytes; | |
399 | offset = 0; | |
400 | } | |
401 | ||
402 | /* Install custom I/O completion handler if read verify is enabled */ | |
403 | if (bio_data_dir(bio) == READ) { | |
404 | bip->bip_end_io = bio->bi_end_io; | |
405 | bio->bi_end_io = bio_integrity_endio; | |
406 | } | |
407 | ||
408 | /* Auto-generate integrity metadata if this is a write */ | |
409 | if (bio_data_dir(bio) == WRITE) | |
410 | bio_integrity_generate(bio); | |
411 | ||
412 | return 0; | |
413 | } | |
414 | EXPORT_SYMBOL(bio_integrity_prep); | |
415 | ||
416 | /** | |
417 | * bio_integrity_verify - Verify integrity metadata for a bio | |
418 | * @bio: bio to verify | |
419 | * | |
420 | * Description: This function is called to verify the integrity of a | |
421 | * bio. The data in the bio io_vec is compared to the integrity | |
422 | * metadata returned by the HBA. | |
423 | */ | |
424 | static int bio_integrity_verify(struct bio *bio) | |
425 | { | |
426 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
427 | struct blk_integrity_exchg bix; | |
428 | struct bio_vec *bv; | |
429 | sector_t sector = bio->bi_integrity->bip_sector; | |
430 | unsigned int i, sectors, total, ret; | |
431 | void *prot_buf = bio->bi_integrity->bip_buf; | |
432 | ||
433 | ret = total = 0; | |
434 | bix.disk_name = bio->bi_bdev->bd_disk->disk_name; | |
435 | bix.sector_size = bi->sector_size; | |
436 | ||
437 | bio_for_each_segment(bv, bio, i) { | |
438 | void *kaddr = kmap_atomic(bv->bv_page, KM_USER0); | |
439 | bix.data_buf = kaddr + bv->bv_offset; | |
440 | bix.data_size = bv->bv_len; | |
441 | bix.prot_buf = prot_buf; | |
442 | bix.sector = sector; | |
443 | ||
444 | ret = bi->verify_fn(&bix); | |
445 | ||
446 | if (ret) { | |
447 | kunmap_atomic(kaddr, KM_USER0); | |
7b24fc4d | 448 | return ret; |
7ba1ba12 MP |
449 | } |
450 | ||
451 | sectors = bv->bv_len / bi->sector_size; | |
452 | sector += sectors; | |
453 | prot_buf += sectors * bi->tuple_size; | |
454 | total += sectors * bi->tuple_size; | |
455 | BUG_ON(total > bio->bi_integrity->bip_size); | |
456 | ||
457 | kunmap_atomic(kaddr, KM_USER0); | |
458 | } | |
459 | ||
460 | return ret; | |
461 | } | |
462 | ||
463 | /** | |
464 | * bio_integrity_verify_fn - Integrity I/O completion worker | |
465 | * @work: Work struct stored in bio to be verified | |
466 | * | |
467 | * Description: This workqueue function is called to complete a READ | |
468 | * request. The function verifies the transferred integrity metadata | |
469 | * and then calls the original bio end_io function. | |
470 | */ | |
471 | static void bio_integrity_verify_fn(struct work_struct *work) | |
472 | { | |
b984679e | 473 | struct bio_integrity_payload *bip = |
7ba1ba12 MP |
474 | container_of(work, struct bio_integrity_payload, bip_work); |
475 | struct bio *bio = bip->bip_bio; | |
7b24fc4d | 476 | int error; |
7ba1ba12 | 477 | |
7b24fc4d | 478 | error = bio_integrity_verify(bio); |
7ba1ba12 MP |
479 | |
480 | /* Restore original bio completion handler */ | |
481 | bio->bi_end_io = bip->bip_end_io; | |
7b24fc4d | 482 | bio_endio(bio, error); |
7ba1ba12 MP |
483 | } |
484 | ||
485 | /** | |
486 | * bio_integrity_endio - Integrity I/O completion function | |
487 | * @bio: Protected bio | |
488 | * @error: Pointer to errno | |
489 | * | |
490 | * Description: Completion for integrity I/O | |
491 | * | |
492 | * Normally I/O completion is done in interrupt context. However, | |
493 | * verifying I/O integrity is a time-consuming task which must be run | |
494 | * in process context. This function postpones completion | |
495 | * accordingly. | |
496 | */ | |
497 | void bio_integrity_endio(struct bio *bio, int error) | |
498 | { | |
499 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
500 | ||
501 | BUG_ON(bip->bip_bio != bio); | |
502 | ||
7b24fc4d MP |
503 | /* In case of an I/O error there is no point in verifying the |
504 | * integrity metadata. Restore original bio end_io handler | |
505 | * and run it. | |
506 | */ | |
507 | if (error) { | |
508 | bio->bi_end_io = bip->bip_end_io; | |
509 | bio_endio(bio, error); | |
510 | ||
511 | return; | |
512 | } | |
513 | ||
7ba1ba12 MP |
514 | INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); |
515 | queue_work(kintegrityd_wq, &bip->bip_work); | |
516 | } | |
517 | EXPORT_SYMBOL(bio_integrity_endio); | |
518 | ||
519 | /** | |
520 | * bio_integrity_mark_head - Advance bip_vec skip bytes | |
521 | * @bip: Integrity vector to advance | |
522 | * @skip: Number of bytes to advance it | |
523 | */ | |
b984679e JA |
524 | void bio_integrity_mark_head(struct bio_integrity_payload *bip, |
525 | unsigned int skip) | |
7ba1ba12 MP |
526 | { |
527 | struct bio_vec *iv; | |
528 | unsigned int i; | |
529 | ||
530 | bip_for_each_vec(iv, bip, i) { | |
531 | if (skip == 0) { | |
532 | bip->bip_idx = i; | |
533 | return; | |
534 | } else if (skip >= iv->bv_len) { | |
535 | skip -= iv->bv_len; | |
536 | } else { /* skip < iv->bv_len) */ | |
537 | iv->bv_offset += skip; | |
538 | iv->bv_len -= skip; | |
539 | bip->bip_idx = i; | |
540 | return; | |
541 | } | |
542 | } | |
543 | } | |
544 | ||
545 | /** | |
546 | * bio_integrity_mark_tail - Truncate bip_vec to be len bytes long | |
547 | * @bip: Integrity vector to truncate | |
548 | * @len: New length of integrity vector | |
549 | */ | |
b984679e JA |
550 | void bio_integrity_mark_tail(struct bio_integrity_payload *bip, |
551 | unsigned int len) | |
7ba1ba12 MP |
552 | { |
553 | struct bio_vec *iv; | |
554 | unsigned int i; | |
555 | ||
556 | bip_for_each_vec(iv, bip, i) { | |
557 | if (len == 0) { | |
558 | bip->bip_vcnt = i; | |
559 | return; | |
560 | } else if (len >= iv->bv_len) { | |
561 | len -= iv->bv_len; | |
562 | } else { /* len < iv->bv_len) */ | |
563 | iv->bv_len = len; | |
564 | len = 0; | |
565 | } | |
566 | } | |
567 | } | |
568 | ||
569 | /** | |
570 | * bio_integrity_advance - Advance integrity vector | |
571 | * @bio: bio whose integrity vector to update | |
572 | * @bytes_done: number of data bytes that have been completed | |
573 | * | |
574 | * Description: This function calculates how many integrity bytes the | |
575 | * number of completed data bytes correspond to and advances the | |
576 | * integrity vector accordingly. | |
577 | */ | |
578 | void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) | |
579 | { | |
580 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
581 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
582 | unsigned int nr_sectors; | |
583 | ||
584 | BUG_ON(bip == NULL); | |
585 | BUG_ON(bi == NULL); | |
586 | ||
587 | nr_sectors = bio_integrity_hw_sectors(bi, bytes_done >> 9); | |
588 | bio_integrity_mark_head(bip, nr_sectors * bi->tuple_size); | |
589 | } | |
590 | EXPORT_SYMBOL(bio_integrity_advance); | |
591 | ||
592 | /** | |
593 | * bio_integrity_trim - Trim integrity vector | |
594 | * @bio: bio whose integrity vector to update | |
595 | * @offset: offset to first data sector | |
596 | * @sectors: number of data sectors | |
597 | * | |
598 | * Description: Used to trim the integrity vector in a cloned bio. | |
599 | * The ivec will be advanced corresponding to 'offset' data sectors | |
600 | * and the length will be truncated corresponding to 'len' data | |
601 | * sectors. | |
602 | */ | |
b984679e JA |
603 | void bio_integrity_trim(struct bio *bio, unsigned int offset, |
604 | unsigned int sectors) | |
7ba1ba12 MP |
605 | { |
606 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
607 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
608 | unsigned int nr_sectors; | |
609 | ||
610 | BUG_ON(bip == NULL); | |
611 | BUG_ON(bi == NULL); | |
612 | BUG_ON(!bio_flagged(bio, BIO_CLONED)); | |
613 | ||
614 | nr_sectors = bio_integrity_hw_sectors(bi, sectors); | |
615 | bip->bip_sector = bip->bip_sector + offset; | |
616 | bio_integrity_mark_head(bip, offset * bi->tuple_size); | |
617 | bio_integrity_mark_tail(bip, sectors * bi->tuple_size); | |
618 | } | |
619 | EXPORT_SYMBOL(bio_integrity_trim); | |
620 | ||
621 | /** | |
622 | * bio_integrity_split - Split integrity metadata | |
623 | * @bio: Protected bio | |
624 | * @bp: Resulting bio_pair | |
625 | * @sectors: Offset | |
626 | * | |
627 | * Description: Splits an integrity page into a bio_pair. | |
628 | */ | |
629 | void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors) | |
630 | { | |
631 | struct blk_integrity *bi; | |
632 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
633 | unsigned int nr_sectors; | |
634 | ||
635 | if (bio_integrity(bio) == 0) | |
636 | return; | |
637 | ||
638 | bi = bdev_get_integrity(bio->bi_bdev); | |
639 | BUG_ON(bi == NULL); | |
640 | BUG_ON(bip->bip_vcnt != 1); | |
641 | ||
642 | nr_sectors = bio_integrity_hw_sectors(bi, sectors); | |
643 | ||
644 | bp->bio1.bi_integrity = &bp->bip1; | |
645 | bp->bio2.bi_integrity = &bp->bip2; | |
646 | ||
647 | bp->iv1 = bip->bip_vec[0]; | |
648 | bp->iv2 = bip->bip_vec[0]; | |
649 | ||
650 | bp->bip1.bip_vec = &bp->iv1; | |
651 | bp->bip2.bip_vec = &bp->iv2; | |
652 | ||
653 | bp->iv1.bv_len = sectors * bi->tuple_size; | |
654 | bp->iv2.bv_offset += sectors * bi->tuple_size; | |
655 | bp->iv2.bv_len -= sectors * bi->tuple_size; | |
656 | ||
657 | bp->bip1.bip_sector = bio->bi_integrity->bip_sector; | |
658 | bp->bip2.bip_sector = bio->bi_integrity->bip_sector + nr_sectors; | |
659 | ||
660 | bp->bip1.bip_vcnt = bp->bip2.bip_vcnt = 1; | |
661 | bp->bip1.bip_idx = bp->bip2.bip_idx = 0; | |
662 | } | |
663 | EXPORT_SYMBOL(bio_integrity_split); | |
664 | ||
665 | /** | |
666 | * bio_integrity_clone - Callback for cloning bios with integrity metadata | |
667 | * @bio: New bio | |
668 | * @bio_src: Original bio | |
87092698 | 669 | * @gfp_mask: Memory allocation mask |
7ba1ba12 MP |
670 | * |
671 | * Description: Called to allocate a bip when cloning a bio | |
672 | */ | |
6d2a78e7 | 673 | int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask) |
7ba1ba12 MP |
674 | { |
675 | struct bio_integrity_payload *bip_src = bio_src->bi_integrity; | |
676 | struct bio_integrity_payload *bip; | |
677 | ||
678 | BUG_ON(bip_src == NULL); | |
679 | ||
6d2a78e7 | 680 | bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); |
7ba1ba12 MP |
681 | |
682 | if (bip == NULL) | |
683 | return -EIO; | |
684 | ||
685 | memcpy(bip->bip_vec, bip_src->bip_vec, | |
686 | bip_src->bip_vcnt * sizeof(struct bio_vec)); | |
687 | ||
688 | bip->bip_sector = bip_src->bip_sector; | |
689 | bip->bip_vcnt = bip_src->bip_vcnt; | |
690 | bip->bip_idx = bip_src->bip_idx; | |
691 | ||
692 | return 0; | |
693 | } | |
694 | EXPORT_SYMBOL(bio_integrity_clone); | |
695 | ||
6d2a78e7 | 696 | static int __init bio_integrity_init(void) |
7ba1ba12 | 697 | { |
6d2a78e7 | 698 | kintegrityd_wq = create_workqueue("kintegrityd"); |
7ba1ba12 | 699 | |
6d2a78e7 MP |
700 | if (!kintegrityd_wq) |
701 | panic("Failed to create kintegrityd\n"); | |
7ba1ba12 | 702 | |
7ba1ba12 MP |
703 | bio_integrity_slab = KMEM_CACHE(bio_integrity_payload, |
704 | SLAB_HWCACHE_ALIGN|SLAB_PANIC); | |
7ba1ba12 | 705 | |
6d2a78e7 MP |
706 | bio_integrity_pool = mempool_create_slab_pool(BIO_POOL_SIZE, |
707 | bio_integrity_slab); | |
708 | if (!bio_integrity_pool) | |
709 | panic("bio_integrity: can't allocate bip pool\n"); | |
7ba1ba12 | 710 | |
6d2a78e7 MP |
711 | integrity_bio_set = bioset_create(BIO_POOL_SIZE, 0); |
712 | if (!integrity_bio_set) | |
713 | panic("bio_integrity: can't allocate bio_set\n"); | |
7ba1ba12 MP |
714 | |
715 | return 0; | |
716 | } | |
6d2a78e7 | 717 | subsys_initcall(bio_integrity_init); |