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/bio.h> 26#include <linux/workqueue.h> 27#include <linux/slab.h> 28 29struct integrity_slab { 30 struct kmem_cache *slab; 31 unsigned short nr_vecs; 32 char name[8]; 33}; 34 35#define IS(x) { .nr_vecs = x, .name = "bip-"__stringify(x) } 36struct integrity_slab bip_slab[BIOVEC_NR_POOLS] __read_mostly = { 37 IS(1), IS(4), IS(16), IS(64), IS(128), IS(BIO_MAX_PAGES), 38}; 39#undef IS 40 41static struct workqueue_struct *kintegrityd_wq; 42 43static inline unsigned int vecs_to_idx(unsigned int nr) 44{ 45 switch (nr) { 46 case 1: 47 return 0; 48 case 2 ... 4: 49 return 1; 50 case 5 ... 16: 51 return 2; 52 case 17 ... 64: 53 return 3; 54 case 65 ... 128: 55 return 4; 56 case 129 ... BIO_MAX_PAGES: 57 return 5; 58 default: 59 BUG(); 60 } 61} 62 63static inline int use_bip_pool(unsigned int idx) 64{ 65 if (idx == BIOVEC_MAX_IDX) 66 return 1; 67 68 return 0; 69} 70 71/** 72 * bio_integrity_alloc_bioset - Allocate integrity payload and attach it to bio 73 * @bio: bio to attach integrity metadata to 74 * @gfp_mask: Memory allocation mask 75 * @nr_vecs: Number of integrity metadata scatter-gather elements 76 * @bs: bio_set to allocate from 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 */ 82struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *bio, 83 gfp_t gfp_mask, 84 unsigned int nr_vecs, 85 struct bio_set *bs) 86{ 87 struct bio_integrity_payload *bip; 88 unsigned int idx = vecs_to_idx(nr_vecs); 89 90 BUG_ON(bio == NULL); 91 bip = NULL; 92 93 /* Lower order allocations come straight from slab */ 94 if (!use_bip_pool(idx)) 95 bip = kmem_cache_alloc(bip_slab[idx].slab, gfp_mask); 96 97 /* Use mempool if lower order alloc failed or max vecs were requested */ 98 if (bip == NULL) { 99 idx = BIOVEC_MAX_IDX; /* so we free the payload properly later */ 100 bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask); 101 102 if (unlikely(bip == NULL)) { 103 printk(KERN_ERR "%s: could not alloc bip\n", __func__); 104 return NULL; 105 } 106 } 107 108 memset(bip, 0, sizeof(*bip)); 109 110 bip->bip_slab = idx; 111 bip->bip_bio = bio; 112 bio->bi_integrity = bip; 113 114 return bip; 115} 116EXPORT_SYMBOL(bio_integrity_alloc_bioset); 117 118/** 119 * bio_integrity_alloc - Allocate integrity payload and attach it to bio 120 * @bio: bio to attach integrity metadata to 121 * @gfp_mask: Memory allocation mask 122 * @nr_vecs: Number of integrity metadata scatter-gather elements 123 * 124 * Description: This function prepares a bio for attaching integrity 125 * metadata. nr_vecs specifies the maximum number of pages containing 126 * integrity metadata that can be attached. 127 */ 128struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, 129 gfp_t gfp_mask, 130 unsigned int nr_vecs) 131{ 132 return bio_integrity_alloc_bioset(bio, gfp_mask, nr_vecs, fs_bio_set); 133} 134EXPORT_SYMBOL(bio_integrity_alloc); 135 136/** 137 * bio_integrity_free - Free bio integrity payload 138 * @bio: bio containing bip to be freed 139 * @bs: bio_set this bio was allocated from 140 * 141 * Description: Used to free the integrity portion of a bio. Usually 142 * called from bio_free(). 143 */ 144void bio_integrity_free(struct bio *bio, struct bio_set *bs) 145{ 146 struct bio_integrity_payload *bip = bio->bi_integrity; 147 148 BUG_ON(bip == NULL); 149 150 /* A cloned bio doesn't own the integrity metadata */ 151 if (!bio_flagged(bio, BIO_CLONED) && !bio_flagged(bio, BIO_FS_INTEGRITY) 152 && bip->bip_buf != NULL) 153 kfree(bip->bip_buf); 154 155 if (use_bip_pool(bip->bip_slab)) 156 mempool_free(bip, bs->bio_integrity_pool); 157 else 158 kmem_cache_free(bip_slab[bip->bip_slab].slab, bip); 159 160 bio->bi_integrity = NULL; 161} 162EXPORT_SYMBOL(bio_integrity_free); 163 164/** 165 * bio_integrity_add_page - Attach integrity metadata 166 * @bio: bio to update 167 * @page: page containing integrity metadata 168 * @len: number of bytes of integrity metadata in page 169 * @offset: start offset within page 170 * 171 * Description: Attach a page containing integrity metadata to bio. 172 */ 173int bio_integrity_add_page(struct bio *bio, struct page *page, 174 unsigned int len, unsigned int offset) 175{ 176 struct bio_integrity_payload *bip = bio->bi_integrity; 177 struct bio_vec *iv; 178 179 if (bip->bip_vcnt >= bvec_nr_vecs(bip->bip_slab)) { 180 printk(KERN_ERR "%s: bip_vec full\n", __func__); 181 return 0; 182 } 183 184 iv = bip_vec_idx(bip, bip->bip_vcnt); 185 BUG_ON(iv == NULL); 186 187 iv->bv_page = page; 188 iv->bv_len = len; 189 iv->bv_offset = offset; 190 bip->bip_vcnt++; 191 192 return len; 193} 194EXPORT_SYMBOL(bio_integrity_add_page); 195 196static int bdev_integrity_enabled(struct block_device *bdev, int rw) 197{ 198 struct blk_integrity *bi = bdev_get_integrity(bdev); 199 200 if (bi == NULL) 201 return 0; 202 203 if (rw == READ && bi->verify_fn != NULL && 204 (bi->flags & INTEGRITY_FLAG_READ)) 205 return 1; 206 207 if (rw == WRITE && bi->generate_fn != NULL && 208 (bi->flags & INTEGRITY_FLAG_WRITE)) 209 return 1; 210 211 return 0; 212} 213 214/** 215 * bio_integrity_enabled - Check whether integrity can be passed 216 * @bio: bio to check 217 * 218 * Description: Determines whether bio_integrity_prep() can be called 219 * on this bio or not. bio data direction and target device must be 220 * set prior to calling. The functions honors the write_generate and 221 * read_verify flags in sysfs. 222 */ 223int bio_integrity_enabled(struct bio *bio) 224{ 225 /* Already protected? */ 226 if (bio_integrity(bio)) 227 return 0; 228 229 return bdev_integrity_enabled(bio->bi_bdev, bio_data_dir(bio)); 230} 231EXPORT_SYMBOL(bio_integrity_enabled); 232 233/** 234 * bio_integrity_hw_sectors - Convert 512b sectors to hardware ditto 235 * @bi: blk_integrity profile for device 236 * @sectors: Number of 512 sectors to convert 237 * 238 * Description: The block layer calculates everything in 512 byte 239 * sectors but integrity metadata is done in terms of the hardware 240 * sector size of the storage device. Convert the block layer sectors 241 * to physical sectors. 242 */ 243static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi, 244 unsigned int sectors) 245{ 246 /* At this point there are only 512b or 4096b DIF/EPP devices */ 247 if (bi->sector_size == 4096) 248 return sectors >>= 3; 249 250 return sectors; 251} 252 253/** 254 * bio_integrity_tag_size - Retrieve integrity tag space 255 * @bio: bio to inspect 256 * 257 * Description: Returns the maximum number of tag bytes that can be 258 * attached to this bio. Filesystems can use this to determine how 259 * much metadata to attach to an I/O. 260 */ 261unsigned int bio_integrity_tag_size(struct bio *bio) 262{ 263 struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); 264 265 BUG_ON(bio->bi_size == 0); 266 267 return bi->tag_size * (bio->bi_size / bi->sector_size); 268} 269EXPORT_SYMBOL(bio_integrity_tag_size); 270 271int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len, int set) 272{ 273 struct bio_integrity_payload *bip = bio->bi_integrity; 274 struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); 275 unsigned int nr_sectors; 276 277 BUG_ON(bip->bip_buf == NULL); 278 279 if (bi->tag_size == 0) 280 return -1; 281 282 nr_sectors = bio_integrity_hw_sectors(bi, 283 DIV_ROUND_UP(len, bi->tag_size)); 284 285 if (nr_sectors * bi->tuple_size > bip->bip_size) { 286 printk(KERN_ERR "%s: tag too big for bio: %u > %u\n", 287 __func__, nr_sectors * bi->tuple_size, bip->bip_size); 288 return -1; 289 } 290 291 if (set) 292 bi->set_tag_fn(bip->bip_buf, tag_buf, nr_sectors); 293 else 294 bi->get_tag_fn(bip->bip_buf, tag_buf, nr_sectors); 295 296 return 0; 297} 298 299/** 300 * bio_integrity_set_tag - Attach a tag buffer to a bio 301 * @bio: bio to attach buffer to 302 * @tag_buf: Pointer to a buffer containing tag data 303 * @len: Length of the included buffer 304 * 305 * Description: Use this function to tag a bio by leveraging the extra 306 * space provided by devices formatted with integrity protection. The 307 * size of the integrity buffer must be <= to the size reported by 308 * bio_integrity_tag_size(). 309 */ 310int bio_integrity_set_tag(struct bio *bio, void *tag_buf, unsigned int len) 311{ 312 BUG_ON(bio_data_dir(bio) != WRITE); 313 314 return bio_integrity_tag(bio, tag_buf, len, 1); 315} 316EXPORT_SYMBOL(bio_integrity_set_tag); 317 318/** 319 * bio_integrity_get_tag - Retrieve a tag buffer from a bio 320 * @bio: bio to retrieve buffer from 321 * @tag_buf: Pointer to a buffer for the tag data 322 * @len: Length of the target buffer 323 * 324 * Description: Use this function to retrieve the tag buffer from a 325 * completed I/O. The size of the integrity buffer must be <= to the 326 * size reported by bio_integrity_tag_size(). 327 */ 328int bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len) 329{ 330 BUG_ON(bio_data_dir(bio) != READ); 331 332 return bio_integrity_tag(bio, tag_buf, len, 0); 333} 334EXPORT_SYMBOL(bio_integrity_get_tag); 335 336/** 337 * bio_integrity_generate - Generate integrity metadata for a bio 338 * @bio: bio to generate integrity metadata for 339 * 340 * Description: Generates integrity metadata for a bio by calling the 341 * block device's generation callback function. The bio must have a 342 * bip attached with enough room to accommodate the generated 343 * integrity metadata. 344 */ 345static void bio_integrity_generate(struct bio *bio) 346{ 347 struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); 348 struct blk_integrity_exchg bix; 349 struct bio_vec *bv; 350 sector_t sector = bio->bi_sector; 351 unsigned int i, sectors, total; 352 void *prot_buf = bio->bi_integrity->bip_buf; 353 354 total = 0; 355 bix.disk_name = bio->bi_bdev->bd_disk->disk_name; 356 bix.sector_size = bi->sector_size; 357 358 bio_for_each_segment(bv, bio, i) { 359 void *kaddr = kmap_atomic(bv->bv_page, KM_USER0); 360 bix.data_buf = kaddr + bv->bv_offset; 361 bix.data_size = bv->bv_len; 362 bix.prot_buf = prot_buf; 363 bix.sector = sector; 364 365 bi->generate_fn(&bix); 366 367 sectors = bv->bv_len / bi->sector_size; 368 sector += sectors; 369 prot_buf += sectors * bi->tuple_size; 370 total += sectors * bi->tuple_size; 371 BUG_ON(total > bio->bi_integrity->bip_size); 372 373 kunmap_atomic(kaddr, KM_USER0); 374 } 375} 376 377static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi) 378{ 379 if (bi) 380 return bi->tuple_size; 381 382 return 0; 383} 384 385/** 386 * bio_integrity_prep - Prepare bio for integrity I/O 387 * @bio: bio to prepare 388 * 389 * Description: Allocates a buffer for integrity metadata, maps the 390 * pages and attaches them to a bio. The bio must have data 391 * direction, target device and start sector set priot to calling. In 392 * the WRITE case, integrity metadata will be generated using the 393 * block device's integrity function. In the READ case, the buffer 394 * will be prepared for DMA and a suitable end_io handler set up. 395 */ 396int bio_integrity_prep(struct bio *bio) 397{ 398 struct bio_integrity_payload *bip; 399 struct blk_integrity *bi; 400 struct request_queue *q; 401 void *buf; 402 unsigned long start, end; 403 unsigned int len, nr_pages; 404 unsigned int bytes, offset, i; 405 unsigned int sectors; 406 407 bi = bdev_get_integrity(bio->bi_bdev); 408 q = bdev_get_queue(bio->bi_bdev); 409 BUG_ON(bi == NULL); 410 BUG_ON(bio_integrity(bio)); 411 412 sectors = bio_integrity_hw_sectors(bi, bio_sectors(bio)); 413 414 /* Allocate kernel buffer for protection data */ 415 len = sectors * blk_integrity_tuple_size(bi); 416 buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); 417 if (unlikely(buf == NULL)) { 418 printk(KERN_ERR "could not allocate integrity buffer\n"); 419 return -ENOMEM; 420 } 421 422 end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; 423 start = ((unsigned long) buf) >> PAGE_SHIFT; 424 nr_pages = end - start; 425 426 /* Allocate bio integrity payload and integrity vectors */ 427 bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); 428 if (unlikely(bip == NULL)) { 429 printk(KERN_ERR "could not allocate data integrity bioset\n"); 430 kfree(buf); 431 return -EIO; 432 } 433 434 bip->bip_buf = buf; 435 bip->bip_size = len; 436 bip->bip_sector = bio->bi_sector; 437 438 /* Map it */ 439 offset = offset_in_page(buf); 440 for (i = 0 ; i < nr_pages ; i++) { 441 int ret; 442 bytes = PAGE_SIZE - offset; 443 444 if (len <= 0) 445 break; 446 447 if (bytes > len) 448 bytes = len; 449 450 ret = bio_integrity_add_page(bio, virt_to_page(buf), 451 bytes, offset); 452 453 if (ret == 0) 454 return 0; 455 456 if (ret < bytes) 457 break; 458 459 buf += bytes; 460 len -= bytes; 461 offset = 0; 462 } 463 464 /* Install custom I/O completion handler if read verify is enabled */ 465 if (bio_data_dir(bio) == READ) { 466 bip->bip_end_io = bio->bi_end_io; 467 bio->bi_end_io = bio_integrity_endio; 468 } 469 470 /* Auto-generate integrity metadata if this is a write */ 471 if (bio_data_dir(bio) == WRITE) 472 bio_integrity_generate(bio); 473 474 return 0; 475} 476EXPORT_SYMBOL(bio_integrity_prep); 477 478/** 479 * bio_integrity_verify - Verify integrity metadata for a bio 480 * @bio: bio to verify 481 * 482 * Description: This function is called to verify the integrity of a 483 * bio. The data in the bio io_vec is compared to the integrity 484 * metadata returned by the HBA. 485 */ 486static int bio_integrity_verify(struct bio *bio) 487{ 488 struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); 489 struct blk_integrity_exchg bix; 490 struct bio_vec *bv; 491 sector_t sector = bio->bi_integrity->bip_sector; 492 unsigned int i, sectors, total, ret; 493 void *prot_buf = bio->bi_integrity->bip_buf; 494 495 ret = total = 0; 496 bix.disk_name = bio->bi_bdev->bd_disk->disk_name; 497 bix.sector_size = bi->sector_size; 498 499 bio_for_each_segment(bv, bio, i) { 500 void *kaddr = kmap_atomic(bv->bv_page, KM_USER0); 501 bix.data_buf = kaddr + bv->bv_offset; 502 bix.data_size = bv->bv_len; 503 bix.prot_buf = prot_buf; 504 bix.sector = sector; 505 506 ret = bi->verify_fn(&bix); 507 508 if (ret) { 509 kunmap_atomic(kaddr, KM_USER0); 510 return ret; 511 } 512 513 sectors = bv->bv_len / bi->sector_size; 514 sector += sectors; 515 prot_buf += sectors * bi->tuple_size; 516 total += sectors * bi->tuple_size; 517 BUG_ON(total > bio->bi_integrity->bip_size); 518 519 kunmap_atomic(kaddr, KM_USER0); 520 } 521 522 return ret; 523} 524 525/** 526 * bio_integrity_verify_fn - Integrity I/O completion worker 527 * @work: Work struct stored in bio to be verified 528 * 529 * Description: This workqueue function is called to complete a READ 530 * request. The function verifies the transferred integrity metadata 531 * and then calls the original bio end_io function. 532 */ 533static void bio_integrity_verify_fn(struct work_struct *work) 534{ 535 struct bio_integrity_payload *bip = 536 container_of(work, struct bio_integrity_payload, bip_work); 537 struct bio *bio = bip->bip_bio; 538 int error; 539 540 error = bio_integrity_verify(bio); 541 542 /* Restore original bio completion handler */ 543 bio->bi_end_io = bip->bip_end_io; 544 bio_endio(bio, error); 545} 546 547/** 548 * bio_integrity_endio - Integrity I/O completion function 549 * @bio: Protected bio 550 * @error: Pointer to errno 551 * 552 * Description: Completion for integrity I/O 553 * 554 * Normally I/O completion is done in interrupt context. However, 555 * verifying I/O integrity is a time-consuming task which must be run 556 * in process context. This function postpones completion 557 * accordingly. 558 */ 559void bio_integrity_endio(struct bio *bio, int error) 560{ 561 struct bio_integrity_payload *bip = bio->bi_integrity; 562 563 BUG_ON(bip->bip_bio != bio); 564 565 /* In case of an I/O error there is no point in verifying the 566 * integrity metadata. Restore original bio end_io handler 567 * and run it. 568 */ 569 if (error) { 570 bio->bi_end_io = bip->bip_end_io; 571 bio_endio(bio, error); 572 573 return; 574 } 575 576 INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); 577 queue_work(kintegrityd_wq, &bip->bip_work); 578} 579EXPORT_SYMBOL(bio_integrity_endio); 580 581/** 582 * bio_integrity_mark_head - Advance bip_vec skip bytes 583 * @bip: Integrity vector to advance 584 * @skip: Number of bytes to advance it 585 */ 586void bio_integrity_mark_head(struct bio_integrity_payload *bip, 587 unsigned int skip) 588{ 589 struct bio_vec *iv; 590 unsigned int i; 591 592 bip_for_each_vec(iv, bip, i) { 593 if (skip == 0) { 594 bip->bip_idx = i; 595 return; 596 } else if (skip >= iv->bv_len) { 597 skip -= iv->bv_len; 598 } else { /* skip < iv->bv_len) */ 599 iv->bv_offset += skip; 600 iv->bv_len -= skip; 601 bip->bip_idx = i; 602 return; 603 } 604 } 605} 606 607/** 608 * bio_integrity_mark_tail - Truncate bip_vec to be len bytes long 609 * @bip: Integrity vector to truncate 610 * @len: New length of integrity vector 611 */ 612void bio_integrity_mark_tail(struct bio_integrity_payload *bip, 613 unsigned int len) 614{ 615 struct bio_vec *iv; 616 unsigned int i; 617 618 bip_for_each_vec(iv, bip, i) { 619 if (len == 0) { 620 bip->bip_vcnt = i; 621 return; 622 } else if (len >= iv->bv_len) { 623 len -= iv->bv_len; 624 } else { /* len < iv->bv_len) */ 625 iv->bv_len = len; 626 len = 0; 627 } 628 } 629} 630 631/** 632 * bio_integrity_advance - Advance integrity vector 633 * @bio: bio whose integrity vector to update 634 * @bytes_done: number of data bytes that have been completed 635 * 636 * Description: This function calculates how many integrity bytes the 637 * number of completed data bytes correspond to and advances the 638 * integrity vector accordingly. 639 */ 640void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) 641{ 642 struct bio_integrity_payload *bip = bio->bi_integrity; 643 struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); 644 unsigned int nr_sectors; 645 646 BUG_ON(bip == NULL); 647 BUG_ON(bi == NULL); 648 649 nr_sectors = bio_integrity_hw_sectors(bi, bytes_done >> 9); 650 bio_integrity_mark_head(bip, nr_sectors * bi->tuple_size); 651} 652EXPORT_SYMBOL(bio_integrity_advance); 653 654/** 655 * bio_integrity_trim - Trim integrity vector 656 * @bio: bio whose integrity vector to update 657 * @offset: offset to first data sector 658 * @sectors: number of data sectors 659 * 660 * Description: Used to trim the integrity vector in a cloned bio. 661 * The ivec will be advanced corresponding to 'offset' data sectors 662 * and the length will be truncated corresponding to 'len' data 663 * sectors. 664 */ 665void bio_integrity_trim(struct bio *bio, unsigned int offset, 666 unsigned int sectors) 667{ 668 struct bio_integrity_payload *bip = bio->bi_integrity; 669 struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); 670 unsigned int nr_sectors; 671 672 BUG_ON(bip == NULL); 673 BUG_ON(bi == NULL); 674 BUG_ON(!bio_flagged(bio, BIO_CLONED)); 675 676 nr_sectors = bio_integrity_hw_sectors(bi, sectors); 677 bip->bip_sector = bip->bip_sector + offset; 678 bio_integrity_mark_head(bip, offset * bi->tuple_size); 679 bio_integrity_mark_tail(bip, sectors * bi->tuple_size); 680} 681EXPORT_SYMBOL(bio_integrity_trim); 682 683/** 684 * bio_integrity_split - Split integrity metadata 685 * @bio: Protected bio 686 * @bp: Resulting bio_pair 687 * @sectors: Offset 688 * 689 * Description: Splits an integrity page into a bio_pair. 690 */ 691void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors) 692{ 693 struct blk_integrity *bi; 694 struct bio_integrity_payload *bip = bio->bi_integrity; 695 unsigned int nr_sectors; 696 697 if (bio_integrity(bio) == 0) 698 return; 699 700 bi = bdev_get_integrity(bio->bi_bdev); 701 BUG_ON(bi == NULL); 702 BUG_ON(bip->bip_vcnt != 1); 703 704 nr_sectors = bio_integrity_hw_sectors(bi, sectors); 705 706 bp->bio1.bi_integrity = &bp->bip1; 707 bp->bio2.bi_integrity = &bp->bip2; 708 709 bp->iv1 = bip->bip_vec[0]; 710 bp->iv2 = bip->bip_vec[0]; 711 712 bp->bip1.bip_vec[0] = bp->iv1; 713 bp->bip2.bip_vec[0] = bp->iv2; 714 715 bp->iv1.bv_len = sectors * bi->tuple_size; 716 bp->iv2.bv_offset += sectors * bi->tuple_size; 717 bp->iv2.bv_len -= sectors * bi->tuple_size; 718 719 bp->bip1.bip_sector = bio->bi_integrity->bip_sector; 720 bp->bip2.bip_sector = bio->bi_integrity->bip_sector + nr_sectors; 721 722 bp->bip1.bip_vcnt = bp->bip2.bip_vcnt = 1; 723 bp->bip1.bip_idx = bp->bip2.bip_idx = 0; 724} 725EXPORT_SYMBOL(bio_integrity_split); 726 727/** 728 * bio_integrity_clone - Callback for cloning bios with integrity metadata 729 * @bio: New bio 730 * @bio_src: Original bio 731 * @gfp_mask: Memory allocation mask 732 * @bs: bio_set to allocate bip from 733 * 734 * Description: Called to allocate a bip when cloning a bio 735 */ 736int bio_integrity_clone(struct bio *bio, struct bio *bio_src, 737 gfp_t gfp_mask, struct bio_set *bs) 738{ 739 struct bio_integrity_payload *bip_src = bio_src->bi_integrity; 740 struct bio_integrity_payload *bip; 741 742 BUG_ON(bip_src == NULL); 743 744 bip = bio_integrity_alloc_bioset(bio, gfp_mask, bip_src->bip_vcnt, bs); 745 746 if (bip == NULL) 747 return -EIO; 748 749 memcpy(bip->bip_vec, bip_src->bip_vec, 750 bip_src->bip_vcnt * sizeof(struct bio_vec)); 751 752 bip->bip_sector = bip_src->bip_sector; 753 bip->bip_vcnt = bip_src->bip_vcnt; 754 bip->bip_idx = bip_src->bip_idx; 755 756 return 0; 757} 758EXPORT_SYMBOL(bio_integrity_clone); 759 760int bioset_integrity_create(struct bio_set *bs, int pool_size) 761{ 762 unsigned int max_slab = vecs_to_idx(BIO_MAX_PAGES); 763 764 bs->bio_integrity_pool = 765 mempool_create_slab_pool(pool_size, bip_slab[max_slab].slab); 766 767 if (!bs->bio_integrity_pool) 768 return -1; 769 770 return 0; 771} 772EXPORT_SYMBOL(bioset_integrity_create); 773 774void bioset_integrity_free(struct bio_set *bs) 775{ 776 if (bs->bio_integrity_pool) 777 mempool_destroy(bs->bio_integrity_pool); 778} 779EXPORT_SYMBOL(bioset_integrity_free); 780 781void __init bio_integrity_init(void) 782{ 783 unsigned int i; 784 785 kintegrityd_wq = create_workqueue("kintegrityd"); 786 if (!kintegrityd_wq) 787 panic("Failed to create kintegrityd\n"); 788 789 for (i = 0 ; i < BIOVEC_NR_POOLS ; i++) { 790 unsigned int size; 791 792 size = sizeof(struct bio_integrity_payload) 793 + bip_slab[i].nr_vecs * sizeof(struct bio_vec); 794 795 bip_slab[i].slab = 796 kmem_cache_create(bip_slab[i].name, size, 0, 797 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); 798 } 799} 800