1 /* 2 * 2.5 block I/O model 3 * 4 * Copyright (C) 2001 Jens Axboe <[email protected]> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public Licens 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- 19 */ 20 #ifndef __LINUX_BIO_H 21 #define __LINUX_BIO_H 22 23 #include <linux/highmem.h> 24 #include <linux/mempool.h> 25 #include <linux/ioprio.h> 26 27 #ifdef CONFIG_BLOCK 28 29 #include <asm/io.h> 30 31 #define BIO_DEBUG 32 33 #ifdef BIO_DEBUG 34 #define BIO_BUG_ON BUG_ON 35 #else 36 #define BIO_BUG_ON 37 #endif 38 39 #define BIO_MAX_PAGES 256 40 #define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT) 41 #define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9) 42 43 /* 44 * was unsigned short, but we might as well be ready for > 64kB I/O pages 45 */ 46 struct bio_vec { 47 struct page *bv_page; 48 unsigned int bv_len; 49 unsigned int bv_offset; 50 }; 51 52 struct bio_set; 53 struct bio; 54 struct bio_integrity_payload; 55 typedef void (bio_end_io_t) (struct bio *, int); 56 typedef void (bio_destructor_t) (struct bio *); 57 58 /* 59 * main unit of I/O for the block layer and lower layers (ie drivers and 60 * stacking drivers) 61 */ 62 struct bio { 63 sector_t bi_sector; /* device address in 512 byte 64 sectors */ 65 struct bio *bi_next; /* request queue link */ 66 struct block_device *bi_bdev; 67 unsigned long bi_flags; /* status, command, etc */ 68 unsigned long bi_rw; /* bottom bits READ/WRITE, 69 * top bits priority 70 */ 71 72 unsigned short bi_vcnt; /* how many bio_vec's */ 73 unsigned short bi_idx; /* current index into bvl_vec */ 74 75 /* Number of segments in this BIO after 76 * physical address coalescing is performed. 77 */ 78 unsigned int bi_phys_segments; 79 80 unsigned int bi_size; /* residual I/O count */ 81 82 /* 83 * To keep track of the max segment size, we account for the 84 * sizes of the first and last mergeable segments in this bio. 85 */ 86 unsigned int bi_seg_front_size; 87 unsigned int bi_seg_back_size; 88 89 unsigned int bi_max_vecs; /* max bvl_vecs we can hold */ 90 91 unsigned int bi_comp_cpu; /* completion CPU */ 92 93 atomic_t bi_cnt; /* pin count */ 94 95 struct bio_vec *bi_io_vec; /* the actual vec list */ 96 97 bio_end_io_t *bi_end_io; 98 99 void *bi_private; 100 #if defined(CONFIG_BLK_DEV_INTEGRITY) 101 struct bio_integrity_payload *bi_integrity; /* data integrity */ 102 #endif 103 104 bio_destructor_t *bi_destructor; /* destructor */ 105 106 /* 107 * We can inline a number of vecs at the end of the bio, to avoid 108 * double allocations for a small number of bio_vecs. This member 109 * MUST obviously be kept at the very end of the bio. 110 */ 111 struct bio_vec bi_inline_vecs[0]; 112 }; 113 114 /* 115 * bio flags 116 */ 117 #define BIO_UPTODATE 0 /* ok after I/O completion */ 118 #define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */ 119 #define BIO_EOF 2 /* out-out-bounds error */ 120 #define BIO_SEG_VALID 3 /* bi_phys_segments valid */ 121 #define BIO_CLONED 4 /* doesn't own data */ 122 #define BIO_BOUNCED 5 /* bio is a bounce bio */ 123 #define BIO_USER_MAPPED 6 /* contains user pages */ 124 #define BIO_EOPNOTSUPP 7 /* not supported */ 125 #define BIO_CPU_AFFINE 8 /* complete bio on same CPU as submitted */ 126 #define BIO_NULL_MAPPED 9 /* contains invalid user pages */ 127 #define BIO_FS_INTEGRITY 10 /* fs owns integrity data, not block layer */ 128 #define BIO_QUIET 11 /* Make BIO Quiet */ 129 #define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag))) 130 131 /* 132 * top 4 bits of bio flags indicate the pool this bio came from 133 */ 134 #define BIO_POOL_BITS (4) 135 #define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS) 136 #define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET) 137 #define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET) 138 139 /* 140 * bio bi_rw flags 141 * 142 * bit 0 -- data direction 143 * If not set, bio is a read from device. If set, it's a write to device. 144 * bit 1 -- rw-ahead when set 145 * bit 2 -- barrier 146 * Insert a serialization point in the IO queue, forcing previously 147 * submitted IO to be completed before this one is issued. 148 * bit 3 -- synchronous I/O hint: the block layer will unplug immediately 149 * Note that this does NOT indicate that the IO itself is sync, just 150 * that the block layer will not postpone issue of this IO by plugging. 151 * bit 4 -- metadata request 152 * Used for tracing to differentiate metadata and data IO. May also 153 * get some preferential treatment in the IO scheduler 154 * bit 5 -- discard sectors 155 * Informs the lower level device that this range of sectors is no longer 156 * used by the file system and may thus be freed by the device. Used 157 * for flash based storage. 158 * bit 6 -- fail fast device errors 159 * bit 7 -- fail fast transport errors 160 * bit 8 -- fail fast driver errors 161 * Don't want driver retries for any fast fail whatever the reason. 162 */ 163 #define BIO_RW 0 /* Must match RW in req flags (blkdev.h) */ 164 #define BIO_RW_AHEAD 1 /* Must match FAILFAST in req flags */ 165 #define BIO_RW_BARRIER 2 166 #define BIO_RW_SYNCIO 3 167 #define BIO_RW_UNPLUG 4 168 #define BIO_RW_META 5 169 #define BIO_RW_DISCARD 6 170 #define BIO_RW_FAILFAST_DEV 7 171 #define BIO_RW_FAILFAST_TRANSPORT 8 172 #define BIO_RW_FAILFAST_DRIVER 9 173 174 #define BIO_RW_SYNC (BIO_RW_SYNCIO | BIO_RW_UNPLUG) 175 176 #define bio_rw_flagged(bio, flag) ((bio)->bi_rw & (1 << (flag))) 177 178 /* 179 * Old defines, these should eventually be replaced by direct usage of 180 * bio_rw_flagged() 181 */ 182 #define bio_barrier(bio) bio_rw_flagged(bio, BIO_RW_BARRIER) 183 #define bio_sync(bio) bio_rw_flagged(bio, BIO_RW_SYNCIO) 184 #define bio_unplug(bio) bio_rw_flagged(bio, BIO_RW_UNPLUG) 185 #define bio_failfast_dev(bio) bio_rw_flagged(bio, BIO_RW_FAILFAST_DEV) 186 #define bio_failfast_transport(bio) \ 187 bio_rw_flagged(bio, BIO_RW_FAILFAST_TRANSPORT) 188 #define bio_failfast_driver(bio) \ 189 bio_rw_flagged(bio, BIO_RW_FAILFAST_DRIVER) 190 #define bio_rw_ahead(bio) bio_rw_flagged(bio, BIO_RW_AHEAD) 191 #define bio_rw_meta(bio) bio_rw_flagged(bio, BIO_RW_META) 192 #define bio_discard(bio) bio_rw_flagged(bio, BIO_RW_DISCARD) 193 194 /* 195 * upper 16 bits of bi_rw define the io priority of this bio 196 */ 197 #define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS) 198 #define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT) 199 #define bio_prio_valid(bio) ioprio_valid(bio_prio(bio)) 200 201 #define bio_set_prio(bio, prio) do { \ 202 WARN_ON(prio >= (1 << IOPRIO_BITS)); \ 203 (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \ 204 (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \ 205 } while (0) 206 207 /* 208 * various member access, note that bio_data should of course not be used 209 * on highmem page vectors 210 */ 211 #define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)])) 212 #define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx) 213 #define bio_page(bio) bio_iovec((bio))->bv_page 214 #define bio_offset(bio) bio_iovec((bio))->bv_offset 215 #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx) 216 #define bio_sectors(bio) ((bio)->bi_size >> 9) 217 #define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio)) 218 219 static inline unsigned int bio_cur_sectors(struct bio *bio) 220 { 221 if (bio->bi_vcnt) 222 return bio_iovec(bio)->bv_len >> 9; 223 else /* dataless requests such as discard */ 224 return bio->bi_size >> 9; 225 } 226 227 static inline void *bio_data(struct bio *bio) 228 { 229 if (bio->bi_vcnt) 230 return page_address(bio_page(bio)) + bio_offset(bio); 231 232 return NULL; 233 } 234 235 static inline int bio_has_allocated_vec(struct bio *bio) 236 { 237 return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs; 238 } 239 240 /* 241 * will die 242 */ 243 #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) 244 #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) 245 246 /* 247 * queues that have highmem support enabled may still need to revert to 248 * PIO transfers occasionally and thus map high pages temporarily. For 249 * permanent PIO fall back, user is probably better off disabling highmem 250 * I/O completely on that queue (see ide-dma for example) 251 */ 252 #define __bio_kmap_atomic(bio, idx, kmtype) \ 253 (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) + \ 254 bio_iovec_idx((bio), (idx))->bv_offset) 255 256 #define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype) 257 258 /* 259 * merge helpers etc 260 */ 261 262 #define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1) 263 #define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx) 264 265 /* Default implementation of BIOVEC_PHYS_MERGEABLE */ 266 #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ 267 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) 268 269 /* 270 * allow arch override, for eg virtualized architectures (put in asm/io.h) 271 */ 272 #ifndef BIOVEC_PHYS_MERGEABLE 273 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ 274 __BIOVEC_PHYS_MERGEABLE(vec1, vec2) 275 #endif 276 277 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ 278 (((addr1) | (mask)) == (((addr2) - 1) | (mask))) 279 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ 280 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, (q)->seg_boundary_mask) 281 #define BIO_SEG_BOUNDARY(q, b1, b2) \ 282 BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2))) 283 284 #define bio_io_error(bio) bio_endio((bio), -EIO) 285 286 /* 287 * drivers should not use the __ version unless they _really_ want to 288 * run through the entire bio and not just pending pieces 289 */ 290 #define __bio_for_each_segment(bvl, bio, i, start_idx) \ 291 for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \ 292 i < (bio)->bi_vcnt; \ 293 bvl++, i++) 294 295 #define bio_for_each_segment(bvl, bio, i) \ 296 __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx) 297 298 /* 299 * get a reference to a bio, so it won't disappear. the intended use is 300 * something like: 301 * 302 * bio_get(bio); 303 * submit_bio(rw, bio); 304 * if (bio->bi_flags ...) 305 * do_something 306 * bio_put(bio); 307 * 308 * without the bio_get(), it could potentially complete I/O before submit_bio 309 * returns. and then bio would be freed memory when if (bio->bi_flags ...) 310 * runs 311 */ 312 #define bio_get(bio) atomic_inc(&(bio)->bi_cnt) 313 314 #if defined(CONFIG_BLK_DEV_INTEGRITY) 315 /* 316 * bio integrity payload 317 */ 318 struct bio_integrity_payload { 319 struct bio *bip_bio; /* parent bio */ 320 struct bio_vec *bip_vec; /* integrity data vector */ 321 322 sector_t bip_sector; /* virtual start sector */ 323 324 void *bip_buf; /* generated integrity data */ 325 bio_end_io_t *bip_end_io; /* saved I/O completion fn */ 326 327 unsigned int bip_size; 328 329 unsigned short bip_pool; /* pool the ivec came from */ 330 unsigned short bip_vcnt; /* # of integrity bio_vecs */ 331 unsigned short bip_idx; /* current bip_vec index */ 332 333 struct work_struct bip_work; /* I/O completion */ 334 }; 335 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 336 337 /* 338 * A bio_pair is used when we need to split a bio. 339 * This can only happen for a bio that refers to just one 340 * page of data, and in the unusual situation when the 341 * page crosses a chunk/device boundary 342 * 343 * The address of the master bio is stored in bio1.bi_private 344 * The address of the pool the pair was allocated from is stored 345 * in bio2.bi_private 346 */ 347 struct bio_pair { 348 struct bio bio1, bio2; 349 struct bio_vec bv1, bv2; 350 #if defined(CONFIG_BLK_DEV_INTEGRITY) 351 struct bio_integrity_payload bip1, bip2; 352 struct bio_vec iv1, iv2; 353 #endif 354 atomic_t cnt; 355 int error; 356 }; 357 extern struct bio_pair *bio_split(struct bio *bi, int first_sectors); 358 extern void bio_pair_release(struct bio_pair *dbio); 359 360 extern struct bio_set *bioset_create(unsigned int, unsigned int); 361 extern void bioset_free(struct bio_set *); 362 363 extern struct bio *bio_alloc(gfp_t, int); 364 extern struct bio *bio_kmalloc(gfp_t, int); 365 extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); 366 extern void bio_put(struct bio *); 367 extern void bio_free(struct bio *, struct bio_set *); 368 369 extern void bio_endio(struct bio *, int); 370 struct request_queue; 371 extern int bio_phys_segments(struct request_queue *, struct bio *); 372 373 extern void __bio_clone(struct bio *, struct bio *); 374 extern struct bio *bio_clone(struct bio *, gfp_t); 375 376 extern void bio_init(struct bio *); 377 378 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); 379 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, 380 unsigned int, unsigned int); 381 extern int bio_get_nr_vecs(struct block_device *); 382 extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int); 383 extern struct bio *bio_map_user(struct request_queue *, struct block_device *, 384 unsigned long, unsigned int, int, gfp_t); 385 struct sg_iovec; 386 struct rq_map_data; 387 extern struct bio *bio_map_user_iov(struct request_queue *, 388 struct block_device *, 389 struct sg_iovec *, int, int, gfp_t); 390 extern void bio_unmap_user(struct bio *); 391 extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, 392 gfp_t); 393 extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, 394 gfp_t, int); 395 extern void bio_set_pages_dirty(struct bio *bio); 396 extern void bio_check_pages_dirty(struct bio *bio); 397 extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *, 398 unsigned long, unsigned int, int, gfp_t); 399 extern struct bio *bio_copy_user_iov(struct request_queue *, 400 struct rq_map_data *, struct sg_iovec *, 401 int, int, gfp_t); 402 extern int bio_uncopy_user(struct bio *); 403 void zero_fill_bio(struct bio *bio); 404 extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *); 405 extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int); 406 extern unsigned int bvec_nr_vecs(unsigned short idx); 407 408 /* 409 * Allow queuer to specify a completion CPU for this bio 410 */ 411 static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu) 412 { 413 bio->bi_comp_cpu = cpu; 414 } 415 416 /* 417 * bio_set is used to allow other portions of the IO system to 418 * allocate their own private memory pools for bio and iovec structures. 419 * These memory pools in turn all allocate from the bio_slab 420 * and the bvec_slabs[]. 421 */ 422 #define BIO_POOL_SIZE 2 423 #define BIOVEC_NR_POOLS 6 424 #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1) 425 426 struct bio_set { 427 struct kmem_cache *bio_slab; 428 unsigned int front_pad; 429 430 mempool_t *bio_pool; 431 #if defined(CONFIG_BLK_DEV_INTEGRITY) 432 mempool_t *bio_integrity_pool; 433 #endif 434 mempool_t *bvec_pool; 435 }; 436 437 struct biovec_slab { 438 int nr_vecs; 439 char *name; 440 struct kmem_cache *slab; 441 }; 442 443 extern struct bio_set *fs_bio_set; 444 extern struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly; 445 446 /* 447 * a small number of entries is fine, not going to be performance critical. 448 * basically we just need to survive 449 */ 450 #define BIO_SPLIT_ENTRIES 2 451 452 #ifdef CONFIG_HIGHMEM 453 /* 454 * remember never ever reenable interrupts between a bvec_kmap_irq and 455 * bvec_kunmap_irq! 456 * 457 * This function MUST be inlined - it plays with the CPU interrupt flags. 458 */ 459 static __always_inline char *bvec_kmap_irq(struct bio_vec *bvec, 460 unsigned long *flags) 461 { 462 unsigned long addr; 463 464 /* 465 * might not be a highmem page, but the preempt/irq count 466 * balancing is a lot nicer this way 467 */ 468 local_irq_save(*flags); 469 addr = (unsigned long) kmap_atomic(bvec->bv_page, KM_BIO_SRC_IRQ); 470 471 BUG_ON(addr & ~PAGE_MASK); 472 473 return (char *) addr + bvec->bv_offset; 474 } 475 476 static __always_inline void bvec_kunmap_irq(char *buffer, 477 unsigned long *flags) 478 { 479 unsigned long ptr = (unsigned long) buffer & PAGE_MASK; 480 481 kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ); 482 local_irq_restore(*flags); 483 } 484 485 #else 486 #define bvec_kmap_irq(bvec, flags) (page_address((bvec)->bv_page) + (bvec)->bv_offset) 487 #define bvec_kunmap_irq(buf, flags) do { *(flags) = 0; } while (0) 488 #endif 489 490 static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx, 491 unsigned long *flags) 492 { 493 return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags); 494 } 495 #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) 496 497 #define bio_kmap_irq(bio, flags) \ 498 __bio_kmap_irq((bio), (bio)->bi_idx, (flags)) 499 #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) 500 501 /* 502 * Check whether this bio carries any data or not. A NULL bio is allowed. 503 */ 504 static inline int bio_has_data(struct bio *bio) 505 { 506 return bio && bio->bi_io_vec != NULL; 507 } 508 509 #if defined(CONFIG_BLK_DEV_INTEGRITY) 510 511 #define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)])) 512 #define bip_vec(bip) bip_vec_idx(bip, 0) 513 514 #define __bip_for_each_vec(bvl, bip, i, start_idx) \ 515 for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \ 516 i < (bip)->bip_vcnt; \ 517 bvl++, i++) 518 519 #define bip_for_each_vec(bvl, bip, i) \ 520 __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx) 521 522 #define bio_integrity(bio) (bio->bi_integrity != NULL) 523 524 extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *); 525 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); 526 extern void bio_integrity_free(struct bio *, struct bio_set *); 527 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); 528 extern int bio_integrity_enabled(struct bio *bio); 529 extern int bio_integrity_set_tag(struct bio *, void *, unsigned int); 530 extern int bio_integrity_get_tag(struct bio *, void *, unsigned int); 531 extern int bio_integrity_prep(struct bio *); 532 extern void bio_integrity_endio(struct bio *, int); 533 extern void bio_integrity_advance(struct bio *, unsigned int); 534 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); 535 extern void bio_integrity_split(struct bio *, struct bio_pair *, int); 536 extern int bio_integrity_clone(struct bio *, struct bio *, struct bio_set *); 537 extern int bioset_integrity_create(struct bio_set *, int); 538 extern void bioset_integrity_free(struct bio_set *); 539 extern void bio_integrity_init_slab(void); 540 541 #else /* CONFIG_BLK_DEV_INTEGRITY */ 542 543 #define bio_integrity(a) (0) 544 #define bioset_integrity_create(a, b) (0) 545 #define bio_integrity_prep(a) (0) 546 #define bio_integrity_enabled(a) (0) 547 #define bio_integrity_clone(a, b, c) (0) 548 #define bioset_integrity_free(a) do { } while (0) 549 #define bio_integrity_free(a, b) do { } while (0) 550 #define bio_integrity_endio(a, b) do { } while (0) 551 #define bio_integrity_advance(a, b) do { } while (0) 552 #define bio_integrity_trim(a, b, c) do { } while (0) 553 #define bio_integrity_split(a, b, c) do { } while (0) 554 #define bio_integrity_set_tag(a, b, c) do { } while (0) 555 #define bio_integrity_get_tag(a, b, c) do { } while (0) 556 #define bio_integrity_init_slab(a) do { } while (0) 557 558 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 559 560 #endif /* CONFIG_BLOCK */ 561 #endif /* __LINUX_BIO_H */ 562