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7ba1ba12 MP |
1 | /* |
2 | * bio-integrity.c - bio data integrity extensions | |
3 | * | |
7878cba9 | 4 | * Copyright (C) 2007, 2008, 2009 Oracle Corporation |
7ba1ba12 MP |
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> | |
afeacc8c | 25 | #include <linux/export.h> |
7ba1ba12 MP |
26 | #include <linux/bio.h> |
27 | #include <linux/workqueue.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
7ba1ba12 | 29 | |
9f060e22 | 30 | #define BIP_INLINE_VECS 4 |
7878cba9 | 31 | |
9f060e22 | 32 | static struct kmem_cache *bip_slab; |
7ba1ba12 MP |
33 | static struct workqueue_struct *kintegrityd_wq; |
34 | ||
35 | /** | |
1e2a410f | 36 | * bio_integrity_alloc - Allocate integrity payload and attach it to bio |
7ba1ba12 MP |
37 | * @bio: bio to attach integrity metadata to |
38 | * @gfp_mask: Memory allocation mask | |
39 | * @nr_vecs: Number of integrity metadata scatter-gather elements | |
7ba1ba12 MP |
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 | */ | |
1e2a410f KO |
45 | struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, |
46 | gfp_t gfp_mask, | |
47 | unsigned int nr_vecs) | |
7ba1ba12 MP |
48 | { |
49 | struct bio_integrity_payload *bip; | |
1e2a410f | 50 | struct bio_set *bs = bio->bi_pool; |
9f060e22 KO |
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 { | |
7878cba9 | 59 | bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask); |
9f060e22 | 60 | inline_vecs = BIP_INLINE_VECS; |
7ba1ba12 MP |
61 | } |
62 | ||
9f060e22 KO |
63 | if (unlikely(!bip)) |
64 | return NULL; | |
65 | ||
7878cba9 MP |
66 | memset(bip, 0, sizeof(*bip)); |
67 | ||
9f060e22 KO |
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 | ||
7878cba9 | 77 | bip->bip_slab = idx; |
7ba1ba12 MP |
78 | bip->bip_bio = bio; |
79 | bio->bi_integrity = bip; | |
80 | ||
81 | return bip; | |
9f060e22 KO |
82 | err: |
83 | mempool_free(bip, bs->bio_integrity_pool); | |
84 | return NULL; | |
7ba1ba12 | 85 | } |
7ba1ba12 MP |
86 | EXPORT_SYMBOL(bio_integrity_alloc); |
87 | ||
88 | /** | |
89 | * bio_integrity_free - Free bio integrity payload | |
90 | * @bio: bio containing bip to be freed | |
7ba1ba12 MP |
91 | * |
92 | * Description: Used to free the integrity portion of a bio. Usually | |
93 | * called from bio_free(). | |
94 | */ | |
1e2a410f | 95 | void bio_integrity_free(struct bio *bio) |
7ba1ba12 MP |
96 | { |
97 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
1e2a410f KO |
98 | struct bio_set *bs = bio->bi_pool; |
99 | ||
29ed7813 | 100 | if (bip->bip_owns_buf) |
7ba1ba12 MP |
101 | kfree(bip->bip_buf); |
102 | ||
9f060e22 KO |
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 | ||
7878cba9 | 108 | mempool_free(bip, bs->bio_integrity_pool); |
9f060e22 KO |
109 | } else { |
110 | kfree(bip); | |
111 | } | |
7ba1ba12 MP |
112 | |
113 | bio->bi_integrity = NULL; | |
114 | } | |
115 | EXPORT_SYMBOL(bio_integrity_free); | |
116 | ||
caaeac35 MP |
117 | static inline unsigned int bip_integrity_vecs(struct bio_integrity_payload *bip) |
118 | { | |
119 | if (bip->bip_slab == BIO_POOL_NONE) | |
120 | return BIP_INLINE_VECS; | |
121 | ||
122 | return bvec_nr_vecs(bip->bip_slab); | |
123 | } | |
124 | ||
7ba1ba12 MP |
125 | /** |
126 | * bio_integrity_add_page - Attach integrity metadata | |
127 | * @bio: bio to update | |
128 | * @page: page containing integrity metadata | |
129 | * @len: number of bytes of integrity metadata in page | |
130 | * @offset: start offset within page | |
131 | * | |
132 | * Description: Attach a page containing integrity metadata to bio. | |
133 | */ | |
134 | int bio_integrity_add_page(struct bio *bio, struct page *page, | |
135 | unsigned int len, unsigned int offset) | |
136 | { | |
137 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
138 | struct bio_vec *iv; | |
139 | ||
caaeac35 | 140 | if (bip->bip_vcnt >= bip_integrity_vecs(bip)) { |
7ba1ba12 MP |
141 | printk(KERN_ERR "%s: bip_vec full\n", __func__); |
142 | return 0; | |
143 | } | |
144 | ||
145 | iv = bip_vec_idx(bip, bip->bip_vcnt); | |
146 | BUG_ON(iv == NULL); | |
7ba1ba12 MP |
147 | |
148 | iv->bv_page = page; | |
149 | iv->bv_len = len; | |
150 | iv->bv_offset = offset; | |
151 | bip->bip_vcnt++; | |
152 | ||
153 | return len; | |
154 | } | |
155 | EXPORT_SYMBOL(bio_integrity_add_page); | |
156 | ||
9c02f2b0 JA |
157 | static int bdev_integrity_enabled(struct block_device *bdev, int rw) |
158 | { | |
159 | struct blk_integrity *bi = bdev_get_integrity(bdev); | |
160 | ||
161 | if (bi == NULL) | |
162 | return 0; | |
163 | ||
164 | if (rw == READ && bi->verify_fn != NULL && | |
165 | (bi->flags & INTEGRITY_FLAG_READ)) | |
166 | return 1; | |
167 | ||
168 | if (rw == WRITE && bi->generate_fn != NULL && | |
169 | (bi->flags & INTEGRITY_FLAG_WRITE)) | |
170 | return 1; | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
7ba1ba12 MP |
175 | /** |
176 | * bio_integrity_enabled - Check whether integrity can be passed | |
177 | * @bio: bio to check | |
178 | * | |
179 | * Description: Determines whether bio_integrity_prep() can be called | |
180 | * on this bio or not. bio data direction and target device must be | |
181 | * set prior to calling. The functions honors the write_generate and | |
182 | * read_verify flags in sysfs. | |
183 | */ | |
184 | int bio_integrity_enabled(struct bio *bio) | |
185 | { | |
186 | /* Already protected? */ | |
187 | if (bio_integrity(bio)) | |
188 | return 0; | |
189 | ||
190 | return bdev_integrity_enabled(bio->bi_bdev, bio_data_dir(bio)); | |
191 | } | |
192 | EXPORT_SYMBOL(bio_integrity_enabled); | |
193 | ||
194 | /** | |
195 | * bio_integrity_hw_sectors - Convert 512b sectors to hardware ditto | |
196 | * @bi: blk_integrity profile for device | |
197 | * @sectors: Number of 512 sectors to convert | |
198 | * | |
199 | * Description: The block layer calculates everything in 512 byte | |
200 | * sectors but integrity metadata is done in terms of the hardware | |
201 | * sector size of the storage device. Convert the block layer sectors | |
202 | * to physical sectors. | |
203 | */ | |
b984679e JA |
204 | static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi, |
205 | unsigned int sectors) | |
7ba1ba12 MP |
206 | { |
207 | /* At this point there are only 512b or 4096b DIF/EPP devices */ | |
208 | if (bi->sector_size == 4096) | |
209 | return sectors >>= 3; | |
210 | ||
211 | return sectors; | |
212 | } | |
213 | ||
214 | /** | |
215 | * bio_integrity_tag_size - Retrieve integrity tag space | |
216 | * @bio: bio to inspect | |
217 | * | |
218 | * Description: Returns the maximum number of tag bytes that can be | |
219 | * attached to this bio. Filesystems can use this to determine how | |
220 | * much metadata to attach to an I/O. | |
221 | */ | |
222 | unsigned int bio_integrity_tag_size(struct bio *bio) | |
223 | { | |
224 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
225 | ||
226 | BUG_ON(bio->bi_size == 0); | |
227 | ||
228 | return bi->tag_size * (bio->bi_size / bi->sector_size); | |
229 | } | |
230 | EXPORT_SYMBOL(bio_integrity_tag_size); | |
231 | ||
232 | int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len, int set) | |
233 | { | |
234 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
235 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
236 | unsigned int nr_sectors; | |
237 | ||
238 | BUG_ON(bip->bip_buf == NULL); | |
239 | ||
240 | if (bi->tag_size == 0) | |
241 | return -1; | |
242 | ||
b984679e JA |
243 | nr_sectors = bio_integrity_hw_sectors(bi, |
244 | DIV_ROUND_UP(len, bi->tag_size)); | |
7ba1ba12 MP |
245 | |
246 | if (nr_sectors * bi->tuple_size > bip->bip_size) { | |
247 | printk(KERN_ERR "%s: tag too big for bio: %u > %u\n", | |
248 | __func__, nr_sectors * bi->tuple_size, bip->bip_size); | |
249 | return -1; | |
250 | } | |
251 | ||
252 | if (set) | |
253 | bi->set_tag_fn(bip->bip_buf, tag_buf, nr_sectors); | |
254 | else | |
255 | bi->get_tag_fn(bip->bip_buf, tag_buf, nr_sectors); | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | /** | |
261 | * bio_integrity_set_tag - Attach a tag buffer to a bio | |
262 | * @bio: bio to attach buffer to | |
263 | * @tag_buf: Pointer to a buffer containing tag data | |
264 | * @len: Length of the included buffer | |
265 | * | |
266 | * Description: Use this function to tag a bio by leveraging the extra | |
267 | * space provided by devices formatted with integrity protection. The | |
268 | * size of the integrity buffer must be <= to the size reported by | |
269 | * bio_integrity_tag_size(). | |
270 | */ | |
271 | int bio_integrity_set_tag(struct bio *bio, void *tag_buf, unsigned int len) | |
272 | { | |
273 | BUG_ON(bio_data_dir(bio) != WRITE); | |
274 | ||
275 | return bio_integrity_tag(bio, tag_buf, len, 1); | |
276 | } | |
277 | EXPORT_SYMBOL(bio_integrity_set_tag); | |
278 | ||
279 | /** | |
280 | * bio_integrity_get_tag - Retrieve a tag buffer from a bio | |
281 | * @bio: bio to retrieve buffer from | |
282 | * @tag_buf: Pointer to a buffer for the tag data | |
283 | * @len: Length of the target buffer | |
284 | * | |
285 | * Description: Use this function to retrieve the tag buffer from a | |
286 | * completed I/O. The size of the integrity buffer must be <= to the | |
287 | * size reported by bio_integrity_tag_size(). | |
288 | */ | |
289 | int bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len) | |
290 | { | |
291 | BUG_ON(bio_data_dir(bio) != READ); | |
292 | ||
293 | return bio_integrity_tag(bio, tag_buf, len, 0); | |
294 | } | |
295 | EXPORT_SYMBOL(bio_integrity_get_tag); | |
296 | ||
297 | /** | |
298 | * bio_integrity_generate - Generate integrity metadata for a bio | |
299 | * @bio: bio to generate integrity metadata for | |
300 | * | |
301 | * Description: Generates integrity metadata for a bio by calling the | |
302 | * block device's generation callback function. The bio must have a | |
303 | * bip attached with enough room to accommodate the generated | |
304 | * integrity metadata. | |
305 | */ | |
306 | static void bio_integrity_generate(struct bio *bio) | |
307 | { | |
308 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
309 | struct blk_integrity_exchg bix; | |
310 | struct bio_vec *bv; | |
311 | sector_t sector = bio->bi_sector; | |
312 | unsigned int i, sectors, total; | |
313 | void *prot_buf = bio->bi_integrity->bip_buf; | |
314 | ||
315 | total = 0; | |
316 | bix.disk_name = bio->bi_bdev->bd_disk->disk_name; | |
317 | bix.sector_size = bi->sector_size; | |
318 | ||
319 | bio_for_each_segment(bv, bio, i) { | |
e8e3c3d6 | 320 | void *kaddr = kmap_atomic(bv->bv_page); |
7ba1ba12 MP |
321 | bix.data_buf = kaddr + bv->bv_offset; |
322 | bix.data_size = bv->bv_len; | |
323 | bix.prot_buf = prot_buf; | |
324 | bix.sector = sector; | |
325 | ||
326 | bi->generate_fn(&bix); | |
327 | ||
328 | sectors = bv->bv_len / bi->sector_size; | |
329 | sector += sectors; | |
330 | prot_buf += sectors * bi->tuple_size; | |
331 | total += sectors * bi->tuple_size; | |
332 | BUG_ON(total > bio->bi_integrity->bip_size); | |
333 | ||
e8e3c3d6 | 334 | kunmap_atomic(kaddr); |
7ba1ba12 MP |
335 | } |
336 | } | |
337 | ||
9c02f2b0 JA |
338 | static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi) |
339 | { | |
340 | if (bi) | |
341 | return bi->tuple_size; | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
7ba1ba12 MP |
346 | /** |
347 | * bio_integrity_prep - Prepare bio for integrity I/O | |
348 | * @bio: bio to prepare | |
349 | * | |
350 | * Description: Allocates a buffer for integrity metadata, maps the | |
351 | * pages and attaches them to a bio. The bio must have data | |
352 | * direction, target device and start sector set priot to calling. In | |
353 | * the WRITE case, integrity metadata will be generated using the | |
354 | * block device's integrity function. In the READ case, the buffer | |
355 | * will be prepared for DMA and a suitable end_io handler set up. | |
356 | */ | |
357 | int bio_integrity_prep(struct bio *bio) | |
358 | { | |
359 | struct bio_integrity_payload *bip; | |
360 | struct blk_integrity *bi; | |
361 | struct request_queue *q; | |
362 | void *buf; | |
363 | unsigned long start, end; | |
364 | unsigned int len, nr_pages; | |
365 | unsigned int bytes, offset, i; | |
366 | unsigned int sectors; | |
367 | ||
368 | bi = bdev_get_integrity(bio->bi_bdev); | |
369 | q = bdev_get_queue(bio->bi_bdev); | |
370 | BUG_ON(bi == NULL); | |
371 | BUG_ON(bio_integrity(bio)); | |
372 | ||
373 | sectors = bio_integrity_hw_sectors(bi, bio_sectors(bio)); | |
374 | ||
375 | /* Allocate kernel buffer for protection data */ | |
376 | len = sectors * blk_integrity_tuple_size(bi); | |
72f46503 | 377 | buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); |
7ba1ba12 MP |
378 | if (unlikely(buf == NULL)) { |
379 | printk(KERN_ERR "could not allocate integrity buffer\n"); | |
220eb7fd | 380 | return -ENOMEM; |
7ba1ba12 MP |
381 | } |
382 | ||
383 | end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
384 | start = ((unsigned long) buf) >> PAGE_SHIFT; | |
385 | nr_pages = end - start; | |
386 | ||
387 | /* Allocate bio integrity payload and integrity vectors */ | |
388 | bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); | |
389 | if (unlikely(bip == NULL)) { | |
390 | printk(KERN_ERR "could not allocate data integrity bioset\n"); | |
391 | kfree(buf); | |
392 | return -EIO; | |
393 | } | |
394 | ||
29ed7813 | 395 | bip->bip_owns_buf = 1; |
7ba1ba12 MP |
396 | bip->bip_buf = buf; |
397 | bip->bip_size = len; | |
398 | bip->bip_sector = bio->bi_sector; | |
399 | ||
400 | /* Map it */ | |
401 | offset = offset_in_page(buf); | |
402 | for (i = 0 ; i < nr_pages ; i++) { | |
403 | int ret; | |
404 | bytes = PAGE_SIZE - offset; | |
405 | ||
406 | if (len <= 0) | |
407 | break; | |
408 | ||
409 | if (bytes > len) | |
410 | bytes = len; | |
411 | ||
412 | ret = bio_integrity_add_page(bio, virt_to_page(buf), | |
413 | bytes, offset); | |
414 | ||
415 | if (ret == 0) | |
416 | return 0; | |
417 | ||
418 | if (ret < bytes) | |
419 | break; | |
420 | ||
421 | buf += bytes; | |
422 | len -= bytes; | |
423 | offset = 0; | |
424 | } | |
425 | ||
426 | /* Install custom I/O completion handler if read verify is enabled */ | |
427 | if (bio_data_dir(bio) == READ) { | |
428 | bip->bip_end_io = bio->bi_end_io; | |
429 | bio->bi_end_io = bio_integrity_endio; | |
430 | } | |
431 | ||
432 | /* Auto-generate integrity metadata if this is a write */ | |
433 | if (bio_data_dir(bio) == WRITE) | |
434 | bio_integrity_generate(bio); | |
435 | ||
436 | return 0; | |
437 | } | |
438 | EXPORT_SYMBOL(bio_integrity_prep); | |
439 | ||
440 | /** | |
441 | * bio_integrity_verify - Verify integrity metadata for a bio | |
442 | * @bio: bio to verify | |
443 | * | |
444 | * Description: This function is called to verify the integrity of a | |
445 | * bio. The data in the bio io_vec is compared to the integrity | |
446 | * metadata returned by the HBA. | |
447 | */ | |
448 | static int bio_integrity_verify(struct bio *bio) | |
449 | { | |
450 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
451 | struct blk_integrity_exchg bix; | |
452 | struct bio_vec *bv; | |
453 | sector_t sector = bio->bi_integrity->bip_sector; | |
454 | unsigned int i, sectors, total, ret; | |
455 | void *prot_buf = bio->bi_integrity->bip_buf; | |
456 | ||
457 | ret = total = 0; | |
458 | bix.disk_name = bio->bi_bdev->bd_disk->disk_name; | |
459 | bix.sector_size = bi->sector_size; | |
460 | ||
68c52c3e | 461 | bio_for_each_segment_all(bv, bio, i) { |
e8e3c3d6 | 462 | void *kaddr = kmap_atomic(bv->bv_page); |
7ba1ba12 MP |
463 | bix.data_buf = kaddr + bv->bv_offset; |
464 | bix.data_size = bv->bv_len; | |
465 | bix.prot_buf = prot_buf; | |
466 | bix.sector = sector; | |
467 | ||
468 | ret = bi->verify_fn(&bix); | |
469 | ||
470 | if (ret) { | |
e8e3c3d6 | 471 | kunmap_atomic(kaddr); |
7b24fc4d | 472 | return ret; |
7ba1ba12 MP |
473 | } |
474 | ||
475 | sectors = bv->bv_len / bi->sector_size; | |
476 | sector += sectors; | |
477 | prot_buf += sectors * bi->tuple_size; | |
478 | total += sectors * bi->tuple_size; | |
479 | BUG_ON(total > bio->bi_integrity->bip_size); | |
480 | ||
e8e3c3d6 | 481 | kunmap_atomic(kaddr); |
7ba1ba12 MP |
482 | } |
483 | ||
484 | return ret; | |
485 | } | |
486 | ||
487 | /** | |
488 | * bio_integrity_verify_fn - Integrity I/O completion worker | |
489 | * @work: Work struct stored in bio to be verified | |
490 | * | |
491 | * Description: This workqueue function is called to complete a READ | |
492 | * request. The function verifies the transferred integrity metadata | |
493 | * and then calls the original bio end_io function. | |
494 | */ | |
495 | static void bio_integrity_verify_fn(struct work_struct *work) | |
496 | { | |
b984679e | 497 | struct bio_integrity_payload *bip = |
7ba1ba12 MP |
498 | container_of(work, struct bio_integrity_payload, bip_work); |
499 | struct bio *bio = bip->bip_bio; | |
7b24fc4d | 500 | int error; |
7ba1ba12 | 501 | |
7b24fc4d | 502 | error = bio_integrity_verify(bio); |
7ba1ba12 MP |
503 | |
504 | /* Restore original bio completion handler */ | |
505 | bio->bi_end_io = bip->bip_end_io; | |
7b24fc4d | 506 | bio_endio(bio, error); |
7ba1ba12 MP |
507 | } |
508 | ||
509 | /** | |
510 | * bio_integrity_endio - Integrity I/O completion function | |
511 | * @bio: Protected bio | |
512 | * @error: Pointer to errno | |
513 | * | |
514 | * Description: Completion for integrity I/O | |
515 | * | |
516 | * Normally I/O completion is done in interrupt context. However, | |
517 | * verifying I/O integrity is a time-consuming task which must be run | |
518 | * in process context. This function postpones completion | |
519 | * accordingly. | |
520 | */ | |
521 | void bio_integrity_endio(struct bio *bio, int error) | |
522 | { | |
523 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
524 | ||
525 | BUG_ON(bip->bip_bio != bio); | |
526 | ||
7b24fc4d MP |
527 | /* In case of an I/O error there is no point in verifying the |
528 | * integrity metadata. Restore original bio end_io handler | |
529 | * and run it. | |
530 | */ | |
531 | if (error) { | |
532 | bio->bi_end_io = bip->bip_end_io; | |
533 | bio_endio(bio, error); | |
534 | ||
535 | return; | |
536 | } | |
537 | ||
7ba1ba12 MP |
538 | INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); |
539 | queue_work(kintegrityd_wq, &bip->bip_work); | |
540 | } | |
541 | EXPORT_SYMBOL(bio_integrity_endio); | |
542 | ||
543 | /** | |
544 | * bio_integrity_mark_head - Advance bip_vec skip bytes | |
545 | * @bip: Integrity vector to advance | |
546 | * @skip: Number of bytes to advance it | |
547 | */ | |
b984679e JA |
548 | void bio_integrity_mark_head(struct bio_integrity_payload *bip, |
549 | unsigned int skip) | |
7ba1ba12 MP |
550 | { |
551 | struct bio_vec *iv; | |
552 | unsigned int i; | |
553 | ||
554 | bip_for_each_vec(iv, bip, i) { | |
555 | if (skip == 0) { | |
556 | bip->bip_idx = i; | |
557 | return; | |
558 | } else if (skip >= iv->bv_len) { | |
559 | skip -= iv->bv_len; | |
560 | } else { /* skip < iv->bv_len) */ | |
561 | iv->bv_offset += skip; | |
562 | iv->bv_len -= skip; | |
563 | bip->bip_idx = i; | |
564 | return; | |
565 | } | |
566 | } | |
567 | } | |
568 | ||
569 | /** | |
570 | * bio_integrity_mark_tail - Truncate bip_vec to be len bytes long | |
571 | * @bip: Integrity vector to truncate | |
572 | * @len: New length of integrity vector | |
573 | */ | |
b984679e JA |
574 | void bio_integrity_mark_tail(struct bio_integrity_payload *bip, |
575 | unsigned int len) | |
7ba1ba12 MP |
576 | { |
577 | struct bio_vec *iv; | |
578 | unsigned int i; | |
579 | ||
580 | bip_for_each_vec(iv, bip, i) { | |
581 | if (len == 0) { | |
582 | bip->bip_vcnt = i; | |
583 | return; | |
584 | } else if (len >= iv->bv_len) { | |
585 | len -= iv->bv_len; | |
586 | } else { /* len < iv->bv_len) */ | |
587 | iv->bv_len = len; | |
588 | len = 0; | |
589 | } | |
590 | } | |
591 | } | |
592 | ||
593 | /** | |
594 | * bio_integrity_advance - Advance integrity vector | |
595 | * @bio: bio whose integrity vector to update | |
596 | * @bytes_done: number of data bytes that have been completed | |
597 | * | |
598 | * Description: This function calculates how many integrity bytes the | |
599 | * number of completed data bytes correspond to and advances the | |
600 | * integrity vector accordingly. | |
601 | */ | |
602 | void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) | |
603 | { | |
604 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
605 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
606 | unsigned int nr_sectors; | |
607 | ||
608 | BUG_ON(bip == NULL); | |
609 | BUG_ON(bi == NULL); | |
610 | ||
611 | nr_sectors = bio_integrity_hw_sectors(bi, bytes_done >> 9); | |
612 | bio_integrity_mark_head(bip, nr_sectors * bi->tuple_size); | |
613 | } | |
614 | EXPORT_SYMBOL(bio_integrity_advance); | |
615 | ||
616 | /** | |
617 | * bio_integrity_trim - Trim integrity vector | |
618 | * @bio: bio whose integrity vector to update | |
619 | * @offset: offset to first data sector | |
620 | * @sectors: number of data sectors | |
621 | * | |
622 | * Description: Used to trim the integrity vector in a cloned bio. | |
623 | * The ivec will be advanced corresponding to 'offset' data sectors | |
624 | * and the length will be truncated corresponding to 'len' data | |
625 | * sectors. | |
626 | */ | |
b984679e JA |
627 | void bio_integrity_trim(struct bio *bio, unsigned int offset, |
628 | unsigned int sectors) | |
7ba1ba12 MP |
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 | BUG_ON(!bio_flagged(bio, BIO_CLONED)); | |
637 | ||
638 | nr_sectors = bio_integrity_hw_sectors(bi, sectors); | |
639 | bip->bip_sector = bip->bip_sector + offset; | |
640 | bio_integrity_mark_head(bip, offset * bi->tuple_size); | |
641 | bio_integrity_mark_tail(bip, sectors * bi->tuple_size); | |
642 | } | |
643 | EXPORT_SYMBOL(bio_integrity_trim); | |
644 | ||
645 | /** | |
646 | * bio_integrity_split - Split integrity metadata | |
647 | * @bio: Protected bio | |
648 | * @bp: Resulting bio_pair | |
649 | * @sectors: Offset | |
650 | * | |
651 | * Description: Splits an integrity page into a bio_pair. | |
652 | */ | |
653 | void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors) | |
654 | { | |
655 | struct blk_integrity *bi; | |
656 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
657 | unsigned int nr_sectors; | |
658 | ||
659 | if (bio_integrity(bio) == 0) | |
660 | return; | |
661 | ||
662 | bi = bdev_get_integrity(bio->bi_bdev); | |
663 | BUG_ON(bi == NULL); | |
664 | BUG_ON(bip->bip_vcnt != 1); | |
665 | ||
666 | nr_sectors = bio_integrity_hw_sectors(bi, sectors); | |
667 | ||
668 | bp->bio1.bi_integrity = &bp->bip1; | |
669 | bp->bio2.bi_integrity = &bp->bip2; | |
670 | ||
5b83636a KO |
671 | bp->iv1 = bip->bip_vec[bip->bip_idx]; |
672 | bp->iv2 = bip->bip_vec[bip->bip_idx]; | |
7ba1ba12 | 673 | |
6fda981c KO |
674 | bp->bip1.bip_vec = &bp->iv1; |
675 | bp->bip2.bip_vec = &bp->iv2; | |
7ba1ba12 MP |
676 | |
677 | bp->iv1.bv_len = sectors * bi->tuple_size; | |
678 | bp->iv2.bv_offset += sectors * bi->tuple_size; | |
679 | bp->iv2.bv_len -= sectors * bi->tuple_size; | |
680 | ||
681 | bp->bip1.bip_sector = bio->bi_integrity->bip_sector; | |
682 | bp->bip2.bip_sector = bio->bi_integrity->bip_sector + nr_sectors; | |
683 | ||
684 | bp->bip1.bip_vcnt = bp->bip2.bip_vcnt = 1; | |
685 | bp->bip1.bip_idx = bp->bip2.bip_idx = 0; | |
686 | } | |
687 | EXPORT_SYMBOL(bio_integrity_split); | |
688 | ||
689 | /** | |
690 | * bio_integrity_clone - Callback for cloning bios with integrity metadata | |
691 | * @bio: New bio | |
692 | * @bio_src: Original bio | |
87092698 | 693 | * @gfp_mask: Memory allocation mask |
7ba1ba12 MP |
694 | * |
695 | * Description: Called to allocate a bip when cloning a bio | |
696 | */ | |
7878cba9 | 697 | int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 698 | gfp_t gfp_mask) |
7ba1ba12 MP |
699 | { |
700 | struct bio_integrity_payload *bip_src = bio_src->bi_integrity; | |
701 | struct bio_integrity_payload *bip; | |
702 | ||
703 | BUG_ON(bip_src == NULL); | |
704 | ||
1e2a410f | 705 | bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); |
7ba1ba12 MP |
706 | |
707 | if (bip == NULL) | |
708 | return -EIO; | |
709 | ||
710 | memcpy(bip->bip_vec, bip_src->bip_vec, | |
711 | bip_src->bip_vcnt * sizeof(struct bio_vec)); | |
712 | ||
713 | bip->bip_sector = bip_src->bip_sector; | |
714 | bip->bip_vcnt = bip_src->bip_vcnt; | |
715 | bip->bip_idx = bip_src->bip_idx; | |
716 | ||
717 | return 0; | |
718 | } | |
719 | EXPORT_SYMBOL(bio_integrity_clone); | |
720 | ||
7878cba9 | 721 | int bioset_integrity_create(struct bio_set *bs, int pool_size) |
7ba1ba12 | 722 | { |
a91a2785 MP |
723 | if (bs->bio_integrity_pool) |
724 | return 0; | |
725 | ||
9f060e22 KO |
726 | bs->bio_integrity_pool = mempool_create_slab_pool(pool_size, bip_slab); |
727 | ||
728 | bs->bvec_integrity_pool = biovec_create_pool(bs, pool_size); | |
729 | if (!bs->bvec_integrity_pool) | |
730 | return -1; | |
7ba1ba12 | 731 | |
7878cba9 MP |
732 | if (!bs->bio_integrity_pool) |
733 | return -1; | |
734 | ||
735 | return 0; | |
736 | } | |
737 | EXPORT_SYMBOL(bioset_integrity_create); | |
738 | ||
739 | void bioset_integrity_free(struct bio_set *bs) | |
740 | { | |
741 | if (bs->bio_integrity_pool) | |
742 | mempool_destroy(bs->bio_integrity_pool); | |
9f060e22 KO |
743 | |
744 | if (bs->bvec_integrity_pool) | |
edc96e2c | 745 | mempool_destroy(bs->bvec_integrity_pool); |
7878cba9 MP |
746 | } |
747 | EXPORT_SYMBOL(bioset_integrity_free); | |
748 | ||
749 | void __init bio_integrity_init(void) | |
750 | { | |
a6e8dc46 TH |
751 | /* |
752 | * kintegrityd won't block much but may burn a lot of CPU cycles. | |
753 | * Make it highpri CPU intensive wq with max concurrency of 1. | |
754 | */ | |
755 | kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM | | |
756 | WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1); | |
6d2a78e7 MP |
757 | if (!kintegrityd_wq) |
758 | panic("Failed to create kintegrityd\n"); | |
7ba1ba12 | 759 | |
9f060e22 KO |
760 | bip_slab = kmem_cache_create("bio_integrity_payload", |
761 | sizeof(struct bio_integrity_payload) + | |
762 | sizeof(struct bio_vec) * BIP_INLINE_VECS, | |
763 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); | |
764 | if (!bip_slab) | |
765 | panic("Failed to create slab\n"); | |
7ba1ba12 | 766 | } |