1 /* 2 * Copyright (C) 2001 Jens Axboe <axboe@suse.de> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public Licens 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- 17 */ 18 #ifndef __LINUX_BIO_H 19 #define __LINUX_BIO_H 20 21 #include <linux/highmem.h> 22 #include <linux/mempool.h> 23 #include <linux/ioprio.h> 24 #include <linux/bug.h> 25 26 #ifdef CONFIG_BLOCK 27 28 #include <asm/io.h> 29 30 /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */ 31 #include <linux/blk_types.h> 32 33 #define BIO_DEBUG 34 35 #ifdef BIO_DEBUG 36 #define BIO_BUG_ON BUG_ON 37 #else 38 #define BIO_BUG_ON 39 #endif 40 41 #define BIO_MAX_PAGES 256 42 43 #define bio_prio(bio) (bio)->bi_ioprio 44 #define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio) 45 46 #define bio_iter_iovec(bio, iter) \ 47 bvec_iter_bvec((bio)->bi_io_vec, (iter)) 48 49 #define bio_iter_page(bio, iter) \ 50 bvec_iter_page((bio)->bi_io_vec, (iter)) 51 #define bio_iter_len(bio, iter) \ 52 bvec_iter_len((bio)->bi_io_vec, (iter)) 53 #define bio_iter_offset(bio, iter) \ 54 bvec_iter_offset((bio)->bi_io_vec, (iter)) 55 56 #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter) 57 #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter) 58 #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter) 59 60 #define bio_multiple_segments(bio) \ 61 ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len) 62 #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9) 63 #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio))) 64 65 /* 66 * Check whether this bio carries any data or not. A NULL bio is allowed. 67 */ 68 static inline bool bio_has_data(struct bio *bio) 69 { 70 if (bio && 71 bio->bi_iter.bi_size && 72 bio_op(bio) != REQ_OP_DISCARD && 73 bio_op(bio) != REQ_OP_SECURE_ERASE) 74 return true; 75 76 return false; 77 } 78 79 static inline bool bio_no_advance_iter(struct bio *bio) 80 { 81 return bio_op(bio) == REQ_OP_DISCARD || 82 bio_op(bio) == REQ_OP_SECURE_ERASE || 83 bio_op(bio) == REQ_OP_WRITE_SAME; 84 } 85 86 static inline bool bio_is_rw(struct bio *bio) 87 { 88 if (!bio_has_data(bio)) 89 return false; 90 91 if (bio_no_advance_iter(bio)) 92 return false; 93 94 return true; 95 } 96 97 static inline bool bio_mergeable(struct bio *bio) 98 { 99 if (bio->bi_opf & REQ_NOMERGE_FLAGS) 100 return false; 101 102 return true; 103 } 104 105 static inline unsigned int bio_cur_bytes(struct bio *bio) 106 { 107 if (bio_has_data(bio)) 108 return bio_iovec(bio).bv_len; 109 else /* dataless requests such as discard */ 110 return bio->bi_iter.bi_size; 111 } 112 113 static inline void *bio_data(struct bio *bio) 114 { 115 if (bio_has_data(bio)) 116 return page_address(bio_page(bio)) + bio_offset(bio); 117 118 return NULL; 119 } 120 121 /* 122 * will die 123 */ 124 #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) 125 #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) 126 127 /* 128 * queues that have highmem support enabled may still need to revert to 129 * PIO transfers occasionally and thus map high pages temporarily. For 130 * permanent PIO fall back, user is probably better off disabling highmem 131 * I/O completely on that queue (see ide-dma for example) 132 */ 133 #define __bio_kmap_atomic(bio, iter) \ 134 (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \ 135 bio_iter_iovec((bio), (iter)).bv_offset) 136 137 #define __bio_kunmap_atomic(addr) kunmap_atomic(addr) 138 139 /* 140 * merge helpers etc 141 */ 142 143 /* Default implementation of BIOVEC_PHYS_MERGEABLE */ 144 #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ 145 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) 146 147 /* 148 * allow arch override, for eg virtualized architectures (put in asm/io.h) 149 */ 150 #ifndef BIOVEC_PHYS_MERGEABLE 151 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ 152 __BIOVEC_PHYS_MERGEABLE(vec1, vec2) 153 #endif 154 155 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ 156 (((addr1) | (mask)) == (((addr2) - 1) | (mask))) 157 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ 158 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) 159 160 /* 161 * drivers should _never_ use the all version - the bio may have been split 162 * before it got to the driver and the driver won't own all of it 163 */ 164 #define bio_for_each_segment_all(bvl, bio, i) \ 165 for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) 166 167 static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, 168 unsigned bytes) 169 { 170 iter->bi_sector += bytes >> 9; 171 172 if (bio_no_advance_iter(bio)) 173 iter->bi_size -= bytes; 174 else 175 bvec_iter_advance(bio->bi_io_vec, iter, bytes); 176 } 177 178 #define __bio_for_each_segment(bvl, bio, iter, start) \ 179 for (iter = (start); \ 180 (iter).bi_size && \ 181 ((bvl = bio_iter_iovec((bio), (iter))), 1); \ 182 bio_advance_iter((bio), &(iter), (bvl).bv_len)) 183 184 #define bio_for_each_segment(bvl, bio, iter) \ 185 __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) 186 187 #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) 188 189 static inline unsigned bio_segments(struct bio *bio) 190 { 191 unsigned segs = 0; 192 struct bio_vec bv; 193 struct bvec_iter iter; 194 195 /* 196 * We special case discard/write same, because they interpret bi_size 197 * differently: 198 */ 199 200 if (bio_op(bio) == REQ_OP_DISCARD) 201 return 1; 202 203 if (bio_op(bio) == REQ_OP_SECURE_ERASE) 204 return 1; 205 206 if (bio_op(bio) == REQ_OP_WRITE_SAME) 207 return 1; 208 209 bio_for_each_segment(bv, bio, iter) 210 segs++; 211 212 return segs; 213 } 214 215 /* 216 * get a reference to a bio, so it won't disappear. the intended use is 217 * something like: 218 * 219 * bio_get(bio); 220 * submit_bio(rw, bio); 221 * if (bio->bi_flags ...) 222 * do_something 223 * bio_put(bio); 224 * 225 * without the bio_get(), it could potentially complete I/O before submit_bio 226 * returns. and then bio would be freed memory when if (bio->bi_flags ...) 227 * runs 228 */ 229 static inline void bio_get(struct bio *bio) 230 { 231 bio->bi_flags |= (1 << BIO_REFFED); 232 smp_mb__before_atomic(); 233 atomic_inc(&bio->__bi_cnt); 234 } 235 236 static inline void bio_cnt_set(struct bio *bio, unsigned int count) 237 { 238 if (count != 1) { 239 bio->bi_flags |= (1 << BIO_REFFED); 240 smp_mb__before_atomic(); 241 } 242 atomic_set(&bio->__bi_cnt, count); 243 } 244 245 static inline bool bio_flagged(struct bio *bio, unsigned int bit) 246 { 247 return (bio->bi_flags & (1U << bit)) != 0; 248 } 249 250 static inline void bio_set_flag(struct bio *bio, unsigned int bit) 251 { 252 bio->bi_flags |= (1U << bit); 253 } 254 255 static inline void bio_clear_flag(struct bio *bio, unsigned int bit) 256 { 257 bio->bi_flags &= ~(1U << bit); 258 } 259 260 static inline void bio_get_first_bvec(struct bio *bio, struct bio_vec *bv) 261 { 262 *bv = bio_iovec(bio); 263 } 264 265 static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) 266 { 267 struct bvec_iter iter = bio->bi_iter; 268 int idx; 269 270 if (unlikely(!bio_multiple_segments(bio))) { 271 *bv = bio_iovec(bio); 272 return; 273 } 274 275 bio_advance_iter(bio, &iter, iter.bi_size); 276 277 if (!iter.bi_bvec_done) 278 idx = iter.bi_idx - 1; 279 else /* in the middle of bvec */ 280 idx = iter.bi_idx; 281 282 *bv = bio->bi_io_vec[idx]; 283 284 /* 285 * iter.bi_bvec_done records actual length of the last bvec 286 * if this bio ends in the middle of one io vector 287 */ 288 if (iter.bi_bvec_done) 289 bv->bv_len = iter.bi_bvec_done; 290 } 291 292 enum bip_flags { 293 BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ 294 BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ 295 BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ 296 BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ 297 BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ 298 }; 299 300 /* 301 * bio integrity payload 302 */ 303 struct bio_integrity_payload { 304 struct bio *bip_bio; /* parent bio */ 305 306 struct bvec_iter bip_iter; 307 308 bio_end_io_t *bip_end_io; /* saved I/O completion fn */ 309 310 unsigned short bip_slab; /* slab the bip came from */ 311 unsigned short bip_vcnt; /* # of integrity bio_vecs */ 312 unsigned short bip_max_vcnt; /* integrity bio_vec slots */ 313 unsigned short bip_flags; /* control flags */ 314 315 struct work_struct bip_work; /* I/O completion */ 316 317 struct bio_vec *bip_vec; 318 struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ 319 }; 320 321 #if defined(CONFIG_BLK_DEV_INTEGRITY) 322 323 static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) 324 { 325 if (bio->bi_opf & REQ_INTEGRITY) 326 return bio->bi_integrity; 327 328 return NULL; 329 } 330 331 static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) 332 { 333 struct bio_integrity_payload *bip = bio_integrity(bio); 334 335 if (bip) 336 return bip->bip_flags & flag; 337 338 return false; 339 } 340 341 static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) 342 { 343 return bip->bip_iter.bi_sector; 344 } 345 346 static inline void bip_set_seed(struct bio_integrity_payload *bip, 347 sector_t seed) 348 { 349 bip->bip_iter.bi_sector = seed; 350 } 351 352 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 353 354 extern void bio_trim(struct bio *bio, int offset, int size); 355 extern struct bio *bio_split(struct bio *bio, int sectors, 356 gfp_t gfp, struct bio_set *bs); 357 358 /** 359 * bio_next_split - get next @sectors from a bio, splitting if necessary 360 * @bio: bio to split 361 * @sectors: number of sectors to split from the front of @bio 362 * @gfp: gfp mask 363 * @bs: bio set to allocate from 364 * 365 * Returns a bio representing the next @sectors of @bio - if the bio is smaller 366 * than @sectors, returns the original bio unchanged. 367 */ 368 static inline struct bio *bio_next_split(struct bio *bio, int sectors, 369 gfp_t gfp, struct bio_set *bs) 370 { 371 if (sectors >= bio_sectors(bio)) 372 return bio; 373 374 return bio_split(bio, sectors, gfp, bs); 375 } 376 377 extern struct bio_set *bioset_create(unsigned int, unsigned int); 378 extern struct bio_set *bioset_create_nobvec(unsigned int, unsigned int); 379 extern void bioset_free(struct bio_set *); 380 extern mempool_t *biovec_create_pool(int pool_entries); 381 382 extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); 383 extern void bio_put(struct bio *); 384 385 extern void __bio_clone_fast(struct bio *, struct bio *); 386 extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); 387 extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); 388 389 extern struct bio_set *fs_bio_set; 390 391 static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) 392 { 393 return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); 394 } 395 396 static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) 397 { 398 return bio_clone_bioset(bio, gfp_mask, fs_bio_set); 399 } 400 401 static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) 402 { 403 return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); 404 } 405 406 static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) 407 { 408 return bio_clone_bioset(bio, gfp_mask, NULL); 409 410 } 411 412 extern void bio_endio(struct bio *); 413 414 static inline void bio_io_error(struct bio *bio) 415 { 416 bio->bi_error = -EIO; 417 bio_endio(bio); 418 } 419 420 struct request_queue; 421 extern int bio_phys_segments(struct request_queue *, struct bio *); 422 423 extern int submit_bio_wait(struct bio *bio); 424 extern void bio_advance(struct bio *, unsigned); 425 426 extern void bio_init(struct bio *); 427 extern void bio_reset(struct bio *); 428 void bio_chain(struct bio *, struct bio *); 429 430 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); 431 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, 432 unsigned int, unsigned int); 433 struct rq_map_data; 434 extern struct bio *bio_map_user_iov(struct request_queue *, 435 const struct iov_iter *, gfp_t); 436 extern void bio_unmap_user(struct bio *); 437 extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, 438 gfp_t); 439 extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, 440 gfp_t, int); 441 extern void bio_set_pages_dirty(struct bio *bio); 442 extern void bio_check_pages_dirty(struct bio *bio); 443 444 void generic_start_io_acct(int rw, unsigned long sectors, 445 struct hd_struct *part); 446 void generic_end_io_acct(int rw, struct hd_struct *part, 447 unsigned long start_time); 448 449 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 450 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" 451 #endif 452 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 453 extern void bio_flush_dcache_pages(struct bio *bi); 454 #else 455 static inline void bio_flush_dcache_pages(struct bio *bi) 456 { 457 } 458 #endif 459 460 extern void bio_copy_data(struct bio *dst, struct bio *src); 461 extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); 462 extern void bio_free_pages(struct bio *bio); 463 464 extern struct bio *bio_copy_user_iov(struct request_queue *, 465 struct rq_map_data *, 466 const struct iov_iter *, 467 gfp_t); 468 extern int bio_uncopy_user(struct bio *); 469 void zero_fill_bio(struct bio *bio); 470 extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); 471 extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); 472 extern unsigned int bvec_nr_vecs(unsigned short idx); 473 474 #ifdef CONFIG_BLK_CGROUP 475 int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); 476 int bio_associate_current(struct bio *bio); 477 void bio_disassociate_task(struct bio *bio); 478 void bio_clone_blkcg_association(struct bio *dst, struct bio *src); 479 #else /* CONFIG_BLK_CGROUP */ 480 static inline int bio_associate_blkcg(struct bio *bio, 481 struct cgroup_subsys_state *blkcg_css) { return 0; } 482 static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } 483 static inline void bio_disassociate_task(struct bio *bio) { } 484 static inline void bio_clone_blkcg_association(struct bio *dst, 485 struct bio *src) { } 486 #endif /* CONFIG_BLK_CGROUP */ 487 488 #ifdef CONFIG_HIGHMEM 489 /* 490 * remember never ever reenable interrupts between a bvec_kmap_irq and 491 * bvec_kunmap_irq! 492 */ 493 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) 494 { 495 unsigned long addr; 496 497 /* 498 * might not be a highmem page, but the preempt/irq count 499 * balancing is a lot nicer this way 500 */ 501 local_irq_save(*flags); 502 addr = (unsigned long) kmap_atomic(bvec->bv_page); 503 504 BUG_ON(addr & ~PAGE_MASK); 505 506 return (char *) addr + bvec->bv_offset; 507 } 508 509 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) 510 { 511 unsigned long ptr = (unsigned long) buffer & PAGE_MASK; 512 513 kunmap_atomic((void *) ptr); 514 local_irq_restore(*flags); 515 } 516 517 #else 518 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) 519 { 520 return page_address(bvec->bv_page) + bvec->bv_offset; 521 } 522 523 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) 524 { 525 *flags = 0; 526 } 527 #endif 528 529 static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter, 530 unsigned long *flags) 531 { 532 return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags); 533 } 534 #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) 535 536 #define bio_kmap_irq(bio, flags) \ 537 __bio_kmap_irq((bio), (bio)->bi_iter, (flags)) 538 #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) 539 540 /* 541 * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. 542 * 543 * A bio_list anchors a singly-linked list of bios chained through the bi_next 544 * member of the bio. The bio_list also caches the last list member to allow 545 * fast access to the tail. 546 */ 547 struct bio_list { 548 struct bio *head; 549 struct bio *tail; 550 }; 551 552 static inline int bio_list_empty(const struct bio_list *bl) 553 { 554 return bl->head == NULL; 555 } 556 557 static inline void bio_list_init(struct bio_list *bl) 558 { 559 bl->head = bl->tail = NULL; 560 } 561 562 #define BIO_EMPTY_LIST { NULL, NULL } 563 564 #define bio_list_for_each(bio, bl) \ 565 for (bio = (bl)->head; bio; bio = bio->bi_next) 566 567 static inline unsigned bio_list_size(const struct bio_list *bl) 568 { 569 unsigned sz = 0; 570 struct bio *bio; 571 572 bio_list_for_each(bio, bl) 573 sz++; 574 575 return sz; 576 } 577 578 static inline void bio_list_add(struct bio_list *bl, struct bio *bio) 579 { 580 bio->bi_next = NULL; 581 582 if (bl->tail) 583 bl->tail->bi_next = bio; 584 else 585 bl->head = bio; 586 587 bl->tail = bio; 588 } 589 590 static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) 591 { 592 bio->bi_next = bl->head; 593 594 bl->head = bio; 595 596 if (!bl->tail) 597 bl->tail = bio; 598 } 599 600 static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) 601 { 602 if (!bl2->head) 603 return; 604 605 if (bl->tail) 606 bl->tail->bi_next = bl2->head; 607 else 608 bl->head = bl2->head; 609 610 bl->tail = bl2->tail; 611 } 612 613 static inline void bio_list_merge_head(struct bio_list *bl, 614 struct bio_list *bl2) 615 { 616 if (!bl2->head) 617 return; 618 619 if (bl->head) 620 bl2->tail->bi_next = bl->head; 621 else 622 bl->tail = bl2->tail; 623 624 bl->head = bl2->head; 625 } 626 627 static inline struct bio *bio_list_peek(struct bio_list *bl) 628 { 629 return bl->head; 630 } 631 632 static inline struct bio *bio_list_pop(struct bio_list *bl) 633 { 634 struct bio *bio = bl->head; 635 636 if (bio) { 637 bl->head = bl->head->bi_next; 638 if (!bl->head) 639 bl->tail = NULL; 640 641 bio->bi_next = NULL; 642 } 643 644 return bio; 645 } 646 647 static inline struct bio *bio_list_get(struct bio_list *bl) 648 { 649 struct bio *bio = bl->head; 650 651 bl->head = bl->tail = NULL; 652 653 return bio; 654 } 655 656 /* 657 * Increment chain count for the bio. Make sure the CHAIN flag update 658 * is visible before the raised count. 659 */ 660 static inline void bio_inc_remaining(struct bio *bio) 661 { 662 bio_set_flag(bio, BIO_CHAIN); 663 smp_mb__before_atomic(); 664 atomic_inc(&bio->__bi_remaining); 665 } 666 667 /* 668 * bio_set is used to allow other portions of the IO system to 669 * allocate their own private memory pools for bio and iovec structures. 670 * These memory pools in turn all allocate from the bio_slab 671 * and the bvec_slabs[]. 672 */ 673 #define BIO_POOL_SIZE 2 674 675 struct bio_set { 676 struct kmem_cache *bio_slab; 677 unsigned int front_pad; 678 679 mempool_t *bio_pool; 680 mempool_t *bvec_pool; 681 #if defined(CONFIG_BLK_DEV_INTEGRITY) 682 mempool_t *bio_integrity_pool; 683 mempool_t *bvec_integrity_pool; 684 #endif 685 686 /* 687 * Deadlock avoidance for stacking block drivers: see comments in 688 * bio_alloc_bioset() for details 689 */ 690 spinlock_t rescue_lock; 691 struct bio_list rescue_list; 692 struct work_struct rescue_work; 693 struct workqueue_struct *rescue_workqueue; 694 }; 695 696 struct biovec_slab { 697 int nr_vecs; 698 char *name; 699 struct kmem_cache *slab; 700 }; 701 702 /* 703 * a small number of entries is fine, not going to be performance critical. 704 * basically we just need to survive 705 */ 706 #define BIO_SPLIT_ENTRIES 2 707 708 #if defined(CONFIG_BLK_DEV_INTEGRITY) 709 710 #define bip_for_each_vec(bvl, bip, iter) \ 711 for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) 712 713 #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ 714 for_each_bio(_bio) \ 715 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) 716 717 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); 718 extern void bio_integrity_free(struct bio *); 719 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); 720 extern bool bio_integrity_enabled(struct bio *bio); 721 extern int bio_integrity_prep(struct bio *); 722 extern void bio_integrity_endio(struct bio *); 723 extern void bio_integrity_advance(struct bio *, unsigned int); 724 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); 725 extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); 726 extern int bioset_integrity_create(struct bio_set *, int); 727 extern void bioset_integrity_free(struct bio_set *); 728 extern void bio_integrity_init(void); 729 730 #else /* CONFIG_BLK_DEV_INTEGRITY */ 731 732 static inline void *bio_integrity(struct bio *bio) 733 { 734 return NULL; 735 } 736 737 static inline bool bio_integrity_enabled(struct bio *bio) 738 { 739 return false; 740 } 741 742 static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) 743 { 744 return 0; 745 } 746 747 static inline void bioset_integrity_free (struct bio_set *bs) 748 { 749 return; 750 } 751 752 static inline int bio_integrity_prep(struct bio *bio) 753 { 754 return 0; 755 } 756 757 static inline void bio_integrity_free(struct bio *bio) 758 { 759 return; 760 } 761 762 static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, 763 gfp_t gfp_mask) 764 { 765 return 0; 766 } 767 768 static inline void bio_integrity_advance(struct bio *bio, 769 unsigned int bytes_done) 770 { 771 return; 772 } 773 774 static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, 775 unsigned int sectors) 776 { 777 return; 778 } 779 780 static inline void bio_integrity_init(void) 781 { 782 return; 783 } 784 785 static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) 786 { 787 return false; 788 } 789 790 static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, 791 unsigned int nr) 792 { 793 return ERR_PTR(-EINVAL); 794 } 795 796 static inline int bio_integrity_add_page(struct bio *bio, struct page *page, 797 unsigned int len, unsigned int offset) 798 { 799 return 0; 800 } 801 802 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 803 804 #endif /* CONFIG_BLOCK */ 805 #endif /* __LINUX_BIO_H */ 806