Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * 2.5 block I/O model |
| 3 | * |
| 4 | * Copyright (C) 2001 Jens Axboe <axboe@suse.de> |
| 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 |
Tejun Heo | 7cc0158 | 2010-08-03 13:14:58 +0200 | [diff] [blame] | 12 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 25 | #include <linux/ioprio.h> |
Paul Gortmaker | 187f188 | 2011-11-23 20:12:59 -0500 | [diff] [blame] | 26 | #include <linux/bug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
David Howells | 02a5e0a | 2007-08-11 22:34:32 +0200 | [diff] [blame] | 28 | #ifdef CONFIG_BLOCK |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/io.h> |
| 31 | |
Tejun Heo | 7cc0158 | 2010-08-03 13:14:58 +0200 | [diff] [blame] | 32 | /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */ |
| 33 | #include <linux/blk_types.h> |
| 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #define BIO_DEBUG |
| 36 | |
| 37 | #ifdef BIO_DEBUG |
| 38 | #define BIO_BUG_ON BUG_ON |
| 39 | #else |
| 40 | #define BIO_BUG_ON |
| 41 | #endif |
| 42 | |
Alexey Dobriyan | d84a847 | 2006-06-25 05:49:32 -0700 | [diff] [blame] | 43 | #define BIO_MAX_PAGES 256 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT) |
| 45 | #define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9) |
| 46 | |
| 47 | /* |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 48 | * upper 16 bits of bi_rw define the io priority of this bio |
| 49 | */ |
| 50 | #define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS) |
| 51 | #define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT) |
| 52 | #define bio_prio_valid(bio) ioprio_valid(bio_prio(bio)) |
| 53 | |
| 54 | #define bio_set_prio(bio, prio) do { \ |
| 55 | WARN_ON(prio >= (1 << IOPRIO_BITS)); \ |
| 56 | (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \ |
| 57 | (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \ |
| 58 | } while (0) |
| 59 | |
| 60 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | * various member access, note that bio_data should of course not be used |
| 62 | * on highmem page vectors |
| 63 | */ |
Kent Overstreet | 4550dd6 | 2013-08-07 14:26:21 -0700 | [diff] [blame] | 64 | #define __bvec_iter_bvec(bvec, iter) (&(bvec)[(iter).bi_idx]) |
Kent Overstreet | a4ad39b1 | 2013-08-07 14:24:32 -0700 | [diff] [blame] | 65 | |
Kent Overstreet | 4550dd6 | 2013-08-07 14:26:21 -0700 | [diff] [blame] | 66 | #define bvec_iter_page(bvec, iter) \ |
| 67 | (__bvec_iter_bvec((bvec), (iter))->bv_page) |
| 68 | |
| 69 | #define bvec_iter_len(bvec, iter) \ |
| 70 | min((iter).bi_size, \ |
| 71 | __bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done) |
| 72 | |
| 73 | #define bvec_iter_offset(bvec, iter) \ |
| 74 | (__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done) |
| 75 | |
| 76 | #define bvec_iter_bvec(bvec, iter) \ |
| 77 | ((struct bio_vec) { \ |
| 78 | .bv_page = bvec_iter_page((bvec), (iter)), \ |
| 79 | .bv_len = bvec_iter_len((bvec), (iter)), \ |
| 80 | .bv_offset = bvec_iter_offset((bvec), (iter)), \ |
| 81 | }) |
| 82 | |
| 83 | #define bio_iter_iovec(bio, iter) \ |
| 84 | bvec_iter_bvec((bio)->bi_io_vec, (iter)) |
| 85 | |
| 86 | #define bio_iter_page(bio, iter) \ |
| 87 | bvec_iter_page((bio)->bi_io_vec, (iter)) |
| 88 | #define bio_iter_len(bio, iter) \ |
| 89 | bvec_iter_len((bio)->bi_io_vec, (iter)) |
| 90 | #define bio_iter_offset(bio, iter) \ |
| 91 | bvec_iter_offset((bio)->bi_io_vec, (iter)) |
| 92 | |
| 93 | #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter) |
| 94 | #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter) |
| 95 | #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter) |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 96 | |
Kent Overstreet | 458b76e | 2013-09-24 16:26:05 -0700 | [diff] [blame] | 97 | #define bio_multiple_segments(bio) \ |
| 98 | ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len) |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 99 | #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9) |
| 100 | #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio))) |
Jens Axboe | bf2de6f | 2007-09-27 13:01:25 +0200 | [diff] [blame] | 101 | |
Kent Overstreet | 458b76e | 2013-09-24 16:26:05 -0700 | [diff] [blame] | 102 | /* |
| 103 | * Check whether this bio carries any data or not. A NULL bio is allowed. |
| 104 | */ |
| 105 | static inline bool bio_has_data(struct bio *bio) |
| 106 | { |
| 107 | if (bio && |
| 108 | bio->bi_iter.bi_size && |
| 109 | !(bio->bi_rw & REQ_DISCARD)) |
| 110 | return true; |
| 111 | |
| 112 | return false; |
| 113 | } |
| 114 | |
| 115 | static inline bool bio_is_rw(struct bio *bio) |
| 116 | { |
| 117 | if (!bio_has_data(bio)) |
| 118 | return false; |
| 119 | |
| 120 | if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK) |
| 121 | return false; |
| 122 | |
| 123 | return true; |
| 124 | } |
| 125 | |
| 126 | static inline bool bio_mergeable(struct bio *bio) |
| 127 | { |
| 128 | if (bio->bi_rw & REQ_NOMERGE_FLAGS) |
| 129 | return false; |
| 130 | |
| 131 | return true; |
| 132 | } |
| 133 | |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 134 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
Jens Axboe | bf2de6f | 2007-09-27 13:01:25 +0200 | [diff] [blame] | 135 | { |
Kent Overstreet | 458b76e | 2013-09-24 16:26:05 -0700 | [diff] [blame] | 136 | if (bio_has_data(bio)) |
Kent Overstreet | a4ad39b1 | 2013-08-07 14:24:32 -0700 | [diff] [blame] | 137 | return bio_iovec(bio).bv_len; |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 138 | else /* dataless requests such as discard */ |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 139 | return bio->bi_iter.bi_size; |
Jens Axboe | bf2de6f | 2007-09-27 13:01:25 +0200 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | static inline void *bio_data(struct bio *bio) |
| 143 | { |
Kent Overstreet | 458b76e | 2013-09-24 16:26:05 -0700 | [diff] [blame] | 144 | if (bio_has_data(bio)) |
Jens Axboe | bf2de6f | 2007-09-27 13:01:25 +0200 | [diff] [blame] | 145 | return page_address(bio_page(bio)) + bio_offset(bio); |
| 146 | |
| 147 | return NULL; |
| 148 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | /* |
| 151 | * will die |
| 152 | */ |
| 153 | #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) |
| 154 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) |
| 155 | |
| 156 | /* |
| 157 | * queues that have highmem support enabled may still need to revert to |
| 158 | * PIO transfers occasionally and thus map high pages temporarily. For |
| 159 | * permanent PIO fall back, user is probably better off disabling highmem |
| 160 | * I/O completely on that queue (see ide-dma for example) |
| 161 | */ |
Kent Overstreet | f619d25 | 2013-08-07 14:30:33 -0700 | [diff] [blame] | 162 | #define __bio_kmap_atomic(bio, iter) \ |
| 163 | (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \ |
| 164 | bio_iter_iovec((bio), (iter)).bv_offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
Kent Overstreet | f619d25 | 2013-08-07 14:30:33 -0700 | [diff] [blame] | 166 | #define __bio_kunmap_atomic(addr) kunmap_atomic(addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
| 168 | /* |
| 169 | * merge helpers etc |
| 170 | */ |
| 171 | |
Jeremy Fitzhardinge | f92131c | 2008-10-29 14:10:51 +0100 | [diff] [blame] | 172 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
| 173 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ |
| 174 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) |
| 175 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | /* |
| 177 | * allow arch override, for eg virtualized architectures (put in asm/io.h) |
| 178 | */ |
| 179 | #ifndef BIOVEC_PHYS_MERGEABLE |
| 180 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ |
Jeremy Fitzhardinge | f92131c | 2008-10-29 14:10:51 +0100 | [diff] [blame] | 181 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | #endif |
| 183 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
| 185 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) |
| 186 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 187 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 189 | #define bio_io_error(bio) bio_endio((bio), -EIO) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
| 191 | /* |
Kent Overstreet | d74c6d5 | 2013-02-06 12:23:11 -0800 | [diff] [blame] | 192 | * drivers should _never_ use the all version - the bio may have been split |
| 193 | * before it got to the driver and the driver won't own all of it |
| 194 | */ |
| 195 | #define bio_for_each_segment_all(bvl, bio, i) \ |
Kent Overstreet | f619d25 | 2013-08-07 14:30:33 -0700 | [diff] [blame] | 196 | for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) |
Kent Overstreet | d74c6d5 | 2013-02-06 12:23:11 -0800 | [diff] [blame] | 197 | |
Kent Overstreet | 4550dd6 | 2013-08-07 14:26:21 -0700 | [diff] [blame] | 198 | static inline void bvec_iter_advance(struct bio_vec *bv, struct bvec_iter *iter, |
| 199 | unsigned bytes) |
| 200 | { |
| 201 | WARN_ONCE(bytes > iter->bi_size, |
| 202 | "Attempted to advance past end of bvec iter\n"); |
| 203 | |
| 204 | while (bytes) { |
| 205 | unsigned len = min(bytes, bvec_iter_len(bv, *iter)); |
| 206 | |
| 207 | bytes -= len; |
| 208 | iter->bi_size -= len; |
| 209 | iter->bi_bvec_done += len; |
| 210 | |
| 211 | if (iter->bi_bvec_done == __bvec_iter_bvec(bv, *iter)->bv_len) { |
| 212 | iter->bi_bvec_done = 0; |
| 213 | iter->bi_idx++; |
| 214 | } |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | #define for_each_bvec(bvl, bio_vec, iter, start) \ |
| 219 | for ((iter) = start; \ |
| 220 | (bvl) = bvec_iter_bvec((bio_vec), (iter)), \ |
| 221 | (iter).bi_size; \ |
| 222 | bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len)) |
| 223 | |
| 224 | |
| 225 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, |
| 226 | unsigned bytes) |
| 227 | { |
| 228 | iter->bi_sector += bytes >> 9; |
| 229 | |
| 230 | if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK) |
| 231 | iter->bi_size -= bytes; |
| 232 | else |
| 233 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); |
| 234 | } |
| 235 | |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 236 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
| 237 | for (iter = (start); \ |
Kent Overstreet | 4550dd6 | 2013-08-07 14:26:21 -0700 | [diff] [blame] | 238 | (iter).bi_size && \ |
| 239 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ |
| 240 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 241 | |
| 242 | #define bio_for_each_segment(bvl, bio, iter) \ |
| 243 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) |
| 244 | |
Kent Overstreet | 4550dd6 | 2013-08-07 14:26:21 -0700 | [diff] [blame] | 245 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
Kent Overstreet | 458b76e | 2013-09-24 16:26:05 -0700 | [diff] [blame] | 247 | static inline unsigned bio_segments(struct bio *bio) |
| 248 | { |
| 249 | unsigned segs = 0; |
| 250 | struct bio_vec bv; |
| 251 | struct bvec_iter iter; |
| 252 | |
| 253 | bio_for_each_segment(bv, bio, iter) |
| 254 | segs++; |
| 255 | |
| 256 | return segs; |
| 257 | } |
| 258 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | /* |
| 260 | * get a reference to a bio, so it won't disappear. the intended use is |
| 261 | * something like: |
| 262 | * |
| 263 | * bio_get(bio); |
| 264 | * submit_bio(rw, bio); |
| 265 | * if (bio->bi_flags ...) |
| 266 | * do_something |
| 267 | * bio_put(bio); |
| 268 | * |
| 269 | * without the bio_get(), it could potentially complete I/O before submit_bio |
| 270 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) |
| 271 | * runs |
| 272 | */ |
| 273 | #define bio_get(bio) atomic_inc(&(bio)->bi_cnt) |
| 274 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 275 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 276 | /* |
| 277 | * bio integrity payload |
| 278 | */ |
| 279 | struct bio_integrity_payload { |
| 280 | struct bio *bip_bio; /* parent bio */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 281 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 282 | struct bvec_iter bip_iter; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 283 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 284 | /* kill - should just use bip_vec */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 285 | void *bip_buf; /* generated integrity data */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 286 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 287 | bio_end_io_t *bip_end_io; /* saved I/O completion fn */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 288 | |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 289 | unsigned short bip_slab; /* slab the bip came from */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 290 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
Kent Overstreet | 29ed781 | 2012-09-04 09:54:22 -0700 | [diff] [blame] | 291 | unsigned bip_owns_buf:1; /* should free bip_buf */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 292 | |
| 293 | struct work_struct bip_work; /* I/O completion */ |
Kent Overstreet | 6fda981 | 2012-10-12 13:18:27 -0700 | [diff] [blame] | 294 | |
| 295 | struct bio_vec *bip_vec; |
| 296 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 297 | }; |
| 298 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
Kent Overstreet | 6678d83 | 2013-08-07 11:14:32 -0700 | [diff] [blame] | 300 | extern void bio_trim(struct bio *bio, int offset, int size); |
Kent Overstreet | 20d0189 | 2013-11-23 18:21:01 -0800 | [diff] [blame] | 301 | extern struct bio *bio_split(struct bio *bio, int sectors, |
| 302 | gfp_t gfp, struct bio_set *bs); |
| 303 | |
| 304 | /** |
| 305 | * bio_next_split - get next @sectors from a bio, splitting if necessary |
| 306 | * @bio: bio to split |
| 307 | * @sectors: number of sectors to split from the front of @bio |
| 308 | * @gfp: gfp mask |
| 309 | * @bs: bio set to allocate from |
| 310 | * |
| 311 | * Returns a bio representing the next @sectors of @bio - if the bio is smaller |
| 312 | * than @sectors, returns the original bio unchanged. |
| 313 | */ |
| 314 | static inline struct bio *bio_next_split(struct bio *bio, int sectors, |
| 315 | gfp_t gfp, struct bio_set *bs) |
| 316 | { |
| 317 | if (sectors >= bio_sectors(bio)) |
| 318 | return bio; |
| 319 | |
| 320 | return bio_split(bio, sectors, gfp, bs); |
| 321 | } |
| 322 | |
Jens Axboe | bb799ca | 2008-12-10 15:35:05 +0100 | [diff] [blame] | 323 | extern struct bio_set *bioset_create(unsigned int, unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | extern void bioset_free(struct bio_set *); |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 325 | extern mempool_t *biovec_create_pool(struct bio_set *bs, int pool_entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 327 | extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | extern void bio_put(struct bio *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
Kent Overstreet | 59d276f | 2013-11-23 18:19:27 -0800 | [diff] [blame] | 330 | extern void __bio_clone_fast(struct bio *, struct bio *); |
| 331 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); |
Kent Overstreet | bf800ef | 2012-09-06 15:35:02 -0700 | [diff] [blame] | 332 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
| 333 | |
Kent Overstreet | 3f86a82 | 2012-09-06 15:35:01 -0700 | [diff] [blame] | 334 | extern struct bio_set *fs_bio_set; |
Rashika Kheria | c4540a7 | 2014-02-09 18:30:39 +0530 | [diff] [blame^] | 335 | unsigned int bio_integrity_tag_size(struct bio *bio); |
Kent Overstreet | 3f86a82 | 2012-09-06 15:35:01 -0700 | [diff] [blame] | 336 | |
| 337 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
| 338 | { |
| 339 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); |
| 340 | } |
| 341 | |
Kent Overstreet | bf800ef | 2012-09-06 15:35:02 -0700 | [diff] [blame] | 342 | static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) |
| 343 | { |
| 344 | return bio_clone_bioset(bio, gfp_mask, fs_bio_set); |
| 345 | } |
| 346 | |
Kent Overstreet | 3f86a82 | 2012-09-06 15:35:01 -0700 | [diff] [blame] | 347 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
| 348 | { |
| 349 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); |
| 350 | } |
| 351 | |
Kent Overstreet | bf800ef | 2012-09-06 15:35:02 -0700 | [diff] [blame] | 352 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
| 353 | { |
| 354 | return bio_clone_bioset(bio, gfp_mask, NULL); |
| 355 | |
| 356 | } |
| 357 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 358 | extern void bio_endio(struct bio *, int); |
Kent Overstreet | 196d38b | 2013-11-23 18:34:15 -0800 | [diff] [blame] | 359 | extern void bio_endio_nodec(struct bio *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | struct request_queue; |
| 361 | extern int bio_phys_segments(struct request_queue *, struct bio *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
Kent Overstreet | 9e88224 | 2012-09-10 14:41:12 -0700 | [diff] [blame] | 363 | extern int submit_bio_wait(int rw, struct bio *bio); |
Kent Overstreet | 054bdf6 | 2012-09-28 13:17:55 -0700 | [diff] [blame] | 364 | extern void bio_advance(struct bio *, unsigned); |
| 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | extern void bio_init(struct bio *); |
Kent Overstreet | f44b48c | 2012-09-06 15:34:58 -0700 | [diff] [blame] | 367 | extern void bio_reset(struct bio *); |
Kent Overstreet | 196d38b | 2013-11-23 18:34:15 -0800 | [diff] [blame] | 368 | void bio_chain(struct bio *, struct bio *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
| 370 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); |
Mike Christie | 6e68af6 | 2005-11-11 05:30:27 -0600 | [diff] [blame] | 371 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
| 372 | unsigned int, unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | extern int bio_get_nr_vecs(struct block_device *); |
| 374 | extern struct bio *bio_map_user(struct request_queue *, struct block_device *, |
FUJITA Tomonori | a3bce90 | 2008-08-28 16:17:05 +0900 | [diff] [blame] | 375 | unsigned long, unsigned int, int, gfp_t); |
James Bottomley | f1970ba | 2005-06-20 14:06:52 +0200 | [diff] [blame] | 376 | struct sg_iovec; |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 377 | struct rq_map_data; |
James Bottomley | f1970ba | 2005-06-20 14:06:52 +0200 | [diff] [blame] | 378 | extern struct bio *bio_map_user_iov(struct request_queue *, |
| 379 | struct block_device *, |
FUJITA Tomonori | a3bce90 | 2008-08-28 16:17:05 +0900 | [diff] [blame] | 380 | struct sg_iovec *, int, int, gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | extern void bio_unmap_user(struct bio *); |
Mike Christie | df46b9a | 2005-06-20 14:04:44 +0200 | [diff] [blame] | 382 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
Al Viro | 27496a8 | 2005-10-21 03:20:48 -0400 | [diff] [blame] | 383 | gfp_t); |
FUJITA Tomonori | 68154e9 | 2008-04-25 12:47:50 +0200 | [diff] [blame] | 384 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
| 385 | gfp_t, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | extern void bio_set_pages_dirty(struct bio *bio); |
| 387 | extern void bio_check_pages_dirty(struct bio *bio); |
Ilya Loginov | 2d4dc89 | 2009-11-26 09:16:19 +0100 | [diff] [blame] | 388 | |
| 389 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| 390 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" |
| 391 | #endif |
| 392 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| 393 | extern void bio_flush_dcache_pages(struct bio *bi); |
| 394 | #else |
| 395 | static inline void bio_flush_dcache_pages(struct bio *bi) |
| 396 | { |
| 397 | } |
| 398 | #endif |
| 399 | |
Kent Overstreet | 16ac3d6 | 2012-09-10 13:57:51 -0700 | [diff] [blame] | 400 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
Kent Overstreet | a078760 | 2012-09-10 14:03:28 -0700 | [diff] [blame] | 401 | extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); |
Kent Overstreet | 16ac3d6 | 2012-09-10 13:57:51 -0700 | [diff] [blame] | 402 | |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 403 | extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *, |
| 404 | unsigned long, unsigned int, int, gfp_t); |
| 405 | extern struct bio *bio_copy_user_iov(struct request_queue *, |
| 406 | struct rq_map_data *, struct sg_iovec *, |
FUJITA Tomonori | a3bce90 | 2008-08-28 16:17:05 +0900 | [diff] [blame] | 407 | int, int, gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | extern int bio_uncopy_user(struct bio *); |
| 409 | void zero_fill_bio(struct bio *bio); |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 410 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
| 411 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 412 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
Martin K. Petersen | 51d654e | 2008-06-17 18:59:56 +0200 | [diff] [blame] | 413 | |
Tejun Heo | 852c788 | 2012-03-05 13:15:27 -0800 | [diff] [blame] | 414 | #ifdef CONFIG_BLK_CGROUP |
| 415 | int bio_associate_current(struct bio *bio); |
| 416 | void bio_disassociate_task(struct bio *bio); |
| 417 | #else /* CONFIG_BLK_CGROUP */ |
| 418 | static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } |
| 419 | static inline void bio_disassociate_task(struct bio *bio) { } |
| 420 | #endif /* CONFIG_BLK_CGROUP */ |
| 421 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | #ifdef CONFIG_HIGHMEM |
| 423 | /* |
Alberto Bertogli | 20b636b | 2009-02-02 12:41:07 +0100 | [diff] [blame] | 424 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
| 425 | * bvec_kunmap_irq! |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | */ |
Alberto Bertogli | 4f570f9 | 2009-11-02 11:40:16 +0100 | [diff] [blame] | 427 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | { |
| 429 | unsigned long addr; |
| 430 | |
| 431 | /* |
| 432 | * might not be a highmem page, but the preempt/irq count |
| 433 | * balancing is a lot nicer this way |
| 434 | */ |
| 435 | local_irq_save(*flags); |
Cong Wang | e8e3c3d | 2011-11-25 23:14:27 +0800 | [diff] [blame] | 436 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
| 438 | BUG_ON(addr & ~PAGE_MASK); |
| 439 | |
| 440 | return (char *) addr + bvec->bv_offset; |
| 441 | } |
| 442 | |
Alberto Bertogli | 4f570f9 | 2009-11-02 11:40:16 +0100 | [diff] [blame] | 443 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | { |
| 445 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; |
| 446 | |
Cong Wang | e8e3c3d | 2011-11-25 23:14:27 +0800 | [diff] [blame] | 447 | kunmap_atomic((void *) ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | local_irq_restore(*flags); |
| 449 | } |
| 450 | |
| 451 | #else |
Geert Uytterhoeven | 11a691b | 2010-10-21 10:32:29 +0200 | [diff] [blame] | 452 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
| 453 | { |
| 454 | return page_address(bvec->bv_page) + bvec->bv_offset; |
| 455 | } |
| 456 | |
| 457 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
| 458 | { |
| 459 | *flags = 0; |
| 460 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | #endif |
| 462 | |
Kent Overstreet | f619d25 | 2013-08-07 14:30:33 -0700 | [diff] [blame] | 463 | static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | unsigned long *flags) |
| 465 | { |
Kent Overstreet | f619d25 | 2013-08-07 14:30:33 -0700 | [diff] [blame] | 466 | return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | } |
| 468 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) |
| 469 | |
| 470 | #define bio_kmap_irq(bio, flags) \ |
Kent Overstreet | f619d25 | 2013-08-07 14:30:33 -0700 | [diff] [blame] | 471 | __bio_kmap_irq((bio), (bio)->bi_iter, (flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
| 473 | |
Jens Axboe | 7a67f63 | 2008-08-08 11:17:12 +0200 | [diff] [blame] | 474 | /* |
Akinobu Mita | e686307 | 2009-04-17 08:41:21 +0200 | [diff] [blame] | 475 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
Christoph Hellwig | 8f3d8ba | 2009-04-07 19:55:13 +0200 | [diff] [blame] | 476 | * |
| 477 | * A bio_list anchors a singly-linked list of bios chained through the bi_next |
| 478 | * member of the bio. The bio_list also caches the last list member to allow |
| 479 | * fast access to the tail. |
| 480 | */ |
| 481 | struct bio_list { |
| 482 | struct bio *head; |
| 483 | struct bio *tail; |
| 484 | }; |
| 485 | |
| 486 | static inline int bio_list_empty(const struct bio_list *bl) |
| 487 | { |
| 488 | return bl->head == NULL; |
| 489 | } |
| 490 | |
| 491 | static inline void bio_list_init(struct bio_list *bl) |
| 492 | { |
| 493 | bl->head = bl->tail = NULL; |
| 494 | } |
| 495 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 496 | #define BIO_EMPTY_LIST { NULL, NULL } |
| 497 | |
Christoph Hellwig | 8f3d8ba | 2009-04-07 19:55:13 +0200 | [diff] [blame] | 498 | #define bio_list_for_each(bio, bl) \ |
| 499 | for (bio = (bl)->head; bio; bio = bio->bi_next) |
| 500 | |
| 501 | static inline unsigned bio_list_size(const struct bio_list *bl) |
| 502 | { |
| 503 | unsigned sz = 0; |
| 504 | struct bio *bio; |
| 505 | |
| 506 | bio_list_for_each(bio, bl) |
| 507 | sz++; |
| 508 | |
| 509 | return sz; |
| 510 | } |
| 511 | |
| 512 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) |
| 513 | { |
| 514 | bio->bi_next = NULL; |
| 515 | |
| 516 | if (bl->tail) |
| 517 | bl->tail->bi_next = bio; |
| 518 | else |
| 519 | bl->head = bio; |
| 520 | |
| 521 | bl->tail = bio; |
| 522 | } |
| 523 | |
| 524 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) |
| 525 | { |
| 526 | bio->bi_next = bl->head; |
| 527 | |
| 528 | bl->head = bio; |
| 529 | |
| 530 | if (!bl->tail) |
| 531 | bl->tail = bio; |
| 532 | } |
| 533 | |
| 534 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) |
| 535 | { |
| 536 | if (!bl2->head) |
| 537 | return; |
| 538 | |
| 539 | if (bl->tail) |
| 540 | bl->tail->bi_next = bl2->head; |
| 541 | else |
| 542 | bl->head = bl2->head; |
| 543 | |
| 544 | bl->tail = bl2->tail; |
| 545 | } |
| 546 | |
| 547 | static inline void bio_list_merge_head(struct bio_list *bl, |
| 548 | struct bio_list *bl2) |
| 549 | { |
| 550 | if (!bl2->head) |
| 551 | return; |
| 552 | |
| 553 | if (bl->head) |
| 554 | bl2->tail->bi_next = bl->head; |
| 555 | else |
| 556 | bl->tail = bl2->tail; |
| 557 | |
| 558 | bl->head = bl2->head; |
| 559 | } |
| 560 | |
Geert Uytterhoeven | 13685a1 | 2009-06-10 04:38:40 +0000 | [diff] [blame] | 561 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
| 562 | { |
| 563 | return bl->head; |
| 564 | } |
| 565 | |
Christoph Hellwig | 8f3d8ba | 2009-04-07 19:55:13 +0200 | [diff] [blame] | 566 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
| 567 | { |
| 568 | struct bio *bio = bl->head; |
| 569 | |
| 570 | if (bio) { |
| 571 | bl->head = bl->head->bi_next; |
| 572 | if (!bl->head) |
| 573 | bl->tail = NULL; |
| 574 | |
| 575 | bio->bi_next = NULL; |
| 576 | } |
| 577 | |
| 578 | return bio; |
| 579 | } |
| 580 | |
| 581 | static inline struct bio *bio_list_get(struct bio_list *bl) |
| 582 | { |
| 583 | struct bio *bio = bl->head; |
| 584 | |
| 585 | bl->head = bl->tail = NULL; |
| 586 | |
| 587 | return bio; |
| 588 | } |
| 589 | |
Kent Overstreet | 57fb233 | 2012-08-24 04:56:11 -0700 | [diff] [blame] | 590 | /* |
| 591 | * bio_set is used to allow other portions of the IO system to |
| 592 | * allocate their own private memory pools for bio and iovec structures. |
| 593 | * These memory pools in turn all allocate from the bio_slab |
| 594 | * and the bvec_slabs[]. |
| 595 | */ |
| 596 | #define BIO_POOL_SIZE 2 |
| 597 | #define BIOVEC_NR_POOLS 6 |
| 598 | #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1) |
| 599 | |
| 600 | struct bio_set { |
| 601 | struct kmem_cache *bio_slab; |
| 602 | unsigned int front_pad; |
| 603 | |
| 604 | mempool_t *bio_pool; |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 605 | mempool_t *bvec_pool; |
Kent Overstreet | 57fb233 | 2012-08-24 04:56:11 -0700 | [diff] [blame] | 606 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 607 | mempool_t *bio_integrity_pool; |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 608 | mempool_t *bvec_integrity_pool; |
Kent Overstreet | 57fb233 | 2012-08-24 04:56:11 -0700 | [diff] [blame] | 609 | #endif |
Kent Overstreet | df2cb6d | 2012-09-10 14:33:46 -0700 | [diff] [blame] | 610 | |
| 611 | /* |
| 612 | * Deadlock avoidance for stacking block drivers: see comments in |
| 613 | * bio_alloc_bioset() for details |
| 614 | */ |
| 615 | spinlock_t rescue_lock; |
| 616 | struct bio_list rescue_list; |
| 617 | struct work_struct rescue_work; |
| 618 | struct workqueue_struct *rescue_workqueue; |
Kent Overstreet | 57fb233 | 2012-08-24 04:56:11 -0700 | [diff] [blame] | 619 | }; |
| 620 | |
| 621 | struct biovec_slab { |
| 622 | int nr_vecs; |
| 623 | char *name; |
| 624 | struct kmem_cache *slab; |
| 625 | }; |
| 626 | |
| 627 | /* |
| 628 | * a small number of entries is fine, not going to be performance critical. |
| 629 | * basically we just need to survive |
| 630 | */ |
| 631 | #define BIO_SPLIT_ENTRIES 2 |
| 632 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 633 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 634 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 635 | |
| 636 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 637 | #define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)])) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 638 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 639 | #define bip_for_each_vec(bvl, bip, iter) \ |
| 640 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 641 | |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 642 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
| 643 | for_each_bio(_bio) \ |
| 644 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) |
| 645 | |
Alberto Bertogli | 8deaf72 | 2008-10-02 12:46:53 +0200 | [diff] [blame] | 646 | #define bio_integrity(bio) (bio->bi_integrity != NULL) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 647 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 648 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 649 | extern void bio_integrity_free(struct bio *); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 650 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
| 651 | extern int bio_integrity_enabled(struct bio *bio); |
| 652 | extern int bio_integrity_set_tag(struct bio *, void *, unsigned int); |
| 653 | extern int bio_integrity_get_tag(struct bio *, void *, unsigned int); |
| 654 | extern int bio_integrity_prep(struct bio *); |
| 655 | extern void bio_integrity_endio(struct bio *, int); |
| 656 | extern void bio_integrity_advance(struct bio *, unsigned int); |
| 657 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 658 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 659 | extern int bioset_integrity_create(struct bio_set *, int); |
| 660 | extern void bioset_integrity_free(struct bio_set *); |
| 661 | extern void bio_integrity_init(void); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 662 | |
| 663 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| 664 | |
Martin K. Petersen | 6898e3b | 2012-01-13 08:15:33 +0100 | [diff] [blame] | 665 | static inline int bio_integrity(struct bio *bio) |
| 666 | { |
| 667 | return 0; |
| 668 | } |
| 669 | |
| 670 | static inline int bio_integrity_enabled(struct bio *bio) |
| 671 | { |
| 672 | return 0; |
| 673 | } |
| 674 | |
| 675 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) |
| 676 | { |
| 677 | return 0; |
| 678 | } |
| 679 | |
| 680 | static inline void bioset_integrity_free (struct bio_set *bs) |
| 681 | { |
| 682 | return; |
| 683 | } |
| 684 | |
| 685 | static inline int bio_integrity_prep(struct bio *bio) |
| 686 | { |
| 687 | return 0; |
| 688 | } |
| 689 | |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 690 | static inline void bio_integrity_free(struct bio *bio) |
Martin K. Petersen | 6898e3b | 2012-01-13 08:15:33 +0100 | [diff] [blame] | 691 | { |
| 692 | return; |
| 693 | } |
| 694 | |
Stephen Rothwell | 0c614e2 | 2011-11-16 09:21:48 +0100 | [diff] [blame] | 695 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 696 | gfp_t gfp_mask) |
Stephen Rothwell | 0c614e2 | 2011-11-16 09:21:48 +0100 | [diff] [blame] | 697 | { |
| 698 | return 0; |
| 699 | } |
Martin K. Petersen | 6898e3b | 2012-01-13 08:15:33 +0100 | [diff] [blame] | 700 | |
Martin K. Petersen | 6898e3b | 2012-01-13 08:15:33 +0100 | [diff] [blame] | 701 | static inline void bio_integrity_advance(struct bio *bio, |
| 702 | unsigned int bytes_done) |
| 703 | { |
| 704 | return; |
| 705 | } |
| 706 | |
| 707 | static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, |
| 708 | unsigned int sectors) |
| 709 | { |
| 710 | return; |
| 711 | } |
| 712 | |
| 713 | static inline void bio_integrity_init(void) |
| 714 | { |
| 715 | return; |
| 716 | } |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 717 | |
| 718 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| 719 | |
David Howells | 02a5e0a | 2007-08-11 22:34:32 +0200 | [diff] [blame] | 720 | #endif /* CONFIG_BLOCK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | #endif /* __LINUX_BIO_H */ |