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1 /* 1 /*
2 * 2.5 block I/O model 2 * 2.5 block I/O model
3 * 3 *
4 * Copyright (C) 2001 Jens Axboe <axboe@suse.d 4 * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
5 * 5 *
6 * This program is free software; you can redi 6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Publi 7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation. 8 * published by the Free Software Foundation.
9 * 9 *
10 * This program is distributed in the hope tha 10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 12
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details 14 * GNU General Public License for more details.
15 * 15 *
16 * You should have received a copy of the GNU 16 * You should have received a copy of the GNU General Public Licens
17 * along with this program; if not, write to t 17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 33 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
19 */ 19 */
20 #ifndef __LINUX_BIO_H 20 #ifndef __LINUX_BIO_H
21 #define __LINUX_BIO_H 21 #define __LINUX_BIO_H
22 22
23 #include <linux/highmem.h> 23 #include <linux/highmem.h>
24 #include <linux/mempool.h> 24 #include <linux/mempool.h>
25 #include <linux/ioprio.h> 25 #include <linux/ioprio.h>
26 26
27 #ifdef CONFIG_BLOCK 27 #ifdef CONFIG_BLOCK
28 28
29 /* Platforms may set this to teach the BIO lay <<
30 #include <asm/io.h> 29 #include <asm/io.h>
31 30
32 #if defined(BIO_VMERGE_MAX_SIZE) && defined(BI <<
33 #define BIOVEC_VIRT_START_SIZE(x) (bvec_to_phy <<
34 #define BIOVEC_VIRT_OVERSIZE(x) ((x) > BIO_VME <<
35 #else <<
36 #define BIOVEC_VIRT_START_SIZE(x) 0 <<
37 #define BIOVEC_VIRT_OVERSIZE(x) 0 <<
38 #endif <<
39 <<
40 #ifndef BIO_VMERGE_BOUNDARY <<
41 #define BIO_VMERGE_BOUNDARY 0 <<
42 #endif <<
43 <<
44 #define BIO_DEBUG 31 #define BIO_DEBUG
45 32
46 #ifdef BIO_DEBUG 33 #ifdef BIO_DEBUG
47 #define BIO_BUG_ON BUG_ON 34 #define BIO_BUG_ON BUG_ON
48 #else 35 #else
49 #define BIO_BUG_ON 36 #define BIO_BUG_ON
50 #endif 37 #endif
51 38
52 #define BIO_MAX_PAGES 256 39 #define BIO_MAX_PAGES 256
53 #define BIO_MAX_SIZE (BIO_MAX_PAGES 40 #define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT)
54 #define BIO_MAX_SECTORS (BIO_MAX_SIZE 41 #define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9)
55 42
56 /* 43 /*
57 * was unsigned short, but we might as well be 44 * was unsigned short, but we might as well be ready for > 64kB I/O pages
58 */ 45 */
59 struct bio_vec { 46 struct bio_vec {
60 struct page *bv_page; 47 struct page *bv_page;
61 unsigned int bv_len; 48 unsigned int bv_len;
62 unsigned int bv_offset; 49 unsigned int bv_offset;
63 }; 50 };
64 51
65 struct bio_set; 52 struct bio_set;
66 struct bio; 53 struct bio;
>> 54 struct bio_integrity_payload;
67 typedef void (bio_end_io_t) (struct bio *, int 55 typedef void (bio_end_io_t) (struct bio *, int);
68 typedef void (bio_destructor_t) (struct bio *) 56 typedef void (bio_destructor_t) (struct bio *);
69 57
70 /* 58 /*
71 * main unit of I/O for the block layer and lo 59 * main unit of I/O for the block layer and lower layers (ie drivers and
72 * stacking drivers) 60 * stacking drivers)
73 */ 61 */
74 struct bio { 62 struct bio {
75 sector_t bi_sector; 63 sector_t bi_sector; /* device address in 512 byte
76 64 sectors */
77 struct bio *bi_next; 65 struct bio *bi_next; /* request queue link */
78 struct block_device *bi_bdev; 66 struct block_device *bi_bdev;
79 unsigned long bi_flags; 67 unsigned long bi_flags; /* status, command, etc */
80 unsigned long bi_rw; 68 unsigned long bi_rw; /* bottom bits READ/WRITE,
81 69 * top bits priority
82 70 */
83 71
84 unsigned short bi_vcnt; 72 unsigned short bi_vcnt; /* how many bio_vec's */
85 unsigned short bi_idx; 73 unsigned short bi_idx; /* current index into bvl_vec */
86 74
87 /* Number of segments in this BIO afte 75 /* Number of segments in this BIO after
88 * physical address coalescing is perf 76 * physical address coalescing is performed.
89 */ 77 */
90 unsigned short bi_phys_segmen !! 78 unsigned int bi_phys_segments;
91 <<
92 /* Number of segments after physical a <<
93 * hardware coalescing is performed. <<
94 */ <<
95 unsigned short bi_hw_segments <<
96 79
97 unsigned int bi_size; 80 unsigned int bi_size; /* residual I/O count */
98 81
99 /* 82 /*
100 * To keep track of the max hw size, w !! 83 * To keep track of the max segment size, we account for the
101 * sizes of the first and last virtual !! 84 * sizes of the first and last mergeable segments in this bio.
102 * in this bio <<
103 */ 85 */
104 unsigned int bi_hw_front_si !! 86 unsigned int bi_seg_front_size;
105 unsigned int bi_hw_back_siz !! 87 unsigned int bi_seg_back_size;
106 88
107 unsigned int bi_max_vecs; 89 unsigned int bi_max_vecs; /* max bvl_vecs we can hold */
108 90
>> 91 unsigned int bi_comp_cpu; /* completion CPU */
>> 92
>> 93 atomic_t bi_cnt; /* pin count */
>> 94
109 struct bio_vec *bi_io_vec; 95 struct bio_vec *bi_io_vec; /* the actual vec list */
110 96
111 bio_end_io_t *bi_end_io; 97 bio_end_io_t *bi_end_io;
112 atomic_t bi_cnt; <<
113 98
114 void *bi_private; 99 void *bi_private;
>> 100 #if defined(CONFIG_BLK_DEV_INTEGRITY)
>> 101 struct bio_integrity_payload *bi_integrity; /* data integrity */
>> 102 #endif
115 103
116 bio_destructor_t *bi_destructor 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];
117 }; 112 };
118 113
119 /* 114 /*
120 * bio flags 115 * bio flags
121 */ 116 */
122 #define BIO_UPTODATE 0 /* ok after I/ 117 #define BIO_UPTODATE 0 /* ok after I/O completion */
123 #define BIO_RW_BLOCK 1 /* RW_AHEAD se 118 #define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */
124 #define BIO_EOF 2 /* out-out-bou 119 #define BIO_EOF 2 /* out-out-bounds error */
125 #define BIO_SEG_VALID 3 /* nr_hw_seg v !! 120 #define BIO_SEG_VALID 3 /* bi_phys_segments valid */
126 #define BIO_CLONED 4 /* doesn't own 121 #define BIO_CLONED 4 /* doesn't own data */
127 #define BIO_BOUNCED 5 /* bio is a bo 122 #define BIO_BOUNCED 5 /* bio is a bounce bio */
128 #define BIO_USER_MAPPED 6 /* contains us 123 #define BIO_USER_MAPPED 6 /* contains user pages */
129 #define BIO_EOPNOTSUPP 7 /* not support 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 */
130 #define bio_flagged(bio, flag) ((bio)->bi_fla 129 #define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
131 130
132 /* 131 /*
133 * top 4 bits of bio flags indicate the pool t 132 * top 4 bits of bio flags indicate the pool this bio came from
134 */ 133 */
135 #define BIO_POOL_BITS (4) 134 #define BIO_POOL_BITS (4)
>> 135 #define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1)
136 #define BIO_POOL_OFFSET (BITS_PER_LONG 136 #define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS)
137 #define BIO_POOL_MASK (1UL << BIO_PO 137 #define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET)
138 #define BIO_POOL_IDX(bio) ((bio)->bi_fla 138 #define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET)
139 139
140 /* 140 /*
141 * bio bi_rw flags 141 * bio bi_rw flags
142 * 142 *
143 * bit 0 -- read (not set) or write (set) !! 143 * bit 0 -- data direction
>> 144 * 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 1 -- rw-ahead when set
145 * bit 2 -- barrier 146 * bit 2 -- barrier
146 * bit 3 -- fail fast, don't want low level dr !! 147 * Insert a serialization point in the IO queue, forcing previously
147 * bit 4 -- synchronous I/O hint: the block la !! 148 * submitted IO to be completed before this one is issued.
>> 149 * bit 3 -- synchronous I/O hint.
>> 150 * bit 4 -- Unplug the device immediately after submitting this bio.
>> 151 * bit 5 -- 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 6 -- 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 7 -- fail fast device errors
>> 159 * bit 8 -- fail fast transport errors
>> 160 * bit 9 -- fail fast driver errors
>> 161 * Don't want driver retries for any fast fail whatever the reason.
>> 162 * bit 10 -- Tell the IO scheduler not to wait for more requests after this
>> 163 one has been submitted, even if it is a SYNC request.
148 */ 164 */
149 #define BIO_RW 0 !! 165 #define BIO_RW 0 /* Must match RW in req flags (blkdev.h) */
150 #define BIO_RW_AHEAD 1 !! 166 #define BIO_RW_AHEAD 1 /* Must match FAILFAST in req flags */
151 #define BIO_RW_BARRIER 2 167 #define BIO_RW_BARRIER 2
152 #define BIO_RW_FAILFAST 3 !! 168 #define BIO_RW_SYNCIO 3
153 #define BIO_RW_SYNC 4 !! 169 #define BIO_RW_UNPLUG 4
154 #define BIO_RW_META 5 170 #define BIO_RW_META 5
>> 171 #define BIO_RW_DISCARD 6
>> 172 #define BIO_RW_FAILFAST_DEV 7
>> 173 #define BIO_RW_FAILFAST_TRANSPORT 8
>> 174 #define BIO_RW_FAILFAST_DRIVER 9
>> 175 #define BIO_RW_NOIDLE 10
>> 176
>> 177 #define bio_rw_flagged(bio, flag) ((bio)->bi_rw & (1 << (flag)))
>> 178
>> 179 /*
>> 180 * Old defines, these should eventually be replaced by direct usage of
>> 181 * bio_rw_flagged()
>> 182 */
>> 183 #define bio_barrier(bio) bio_rw_flagged(bio, BIO_RW_BARRIER)
>> 184 #define bio_sync(bio) bio_rw_flagged(bio, BIO_RW_SYNCIO)
>> 185 #define bio_unplug(bio) bio_rw_flagged(bio, BIO_RW_UNPLUG)
>> 186 #define bio_failfast_dev(bio) bio_rw_flagged(bio, BIO_RW_FAILFAST_DEV)
>> 187 #define bio_failfast_transport(bio) \
>> 188 bio_rw_flagged(bio, BIO_RW_FAILFAST_TRANSPORT)
>> 189 #define bio_failfast_driver(bio) \
>> 190 bio_rw_flagged(bio, BIO_RW_FAILFAST_DRIVER)
>> 191 #define bio_rw_ahead(bio) bio_rw_flagged(bio, BIO_RW_AHEAD)
>> 192 #define bio_rw_meta(bio) bio_rw_flagged(bio, BIO_RW_META)
>> 193 #define bio_discard(bio) bio_rw_flagged(bio, BIO_RW_DISCARD)
>> 194 #define bio_noidle(bio) bio_rw_flagged(bio, BIO_RW_NOIDLE)
155 195
156 /* 196 /*
157 * upper 16 bits of bi_rw define the io priori 197 * upper 16 bits of bi_rw define the io priority of this bio
158 */ 198 */
159 #define BIO_PRIO_SHIFT (8 * sizeof(unsigned l 199 #define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS)
160 #define bio_prio(bio) ((bio)->bi_rw >> BIO_P 200 #define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT)
161 #define bio_prio_valid(bio) ioprio_valid(b 201 #define bio_prio_valid(bio) ioprio_valid(bio_prio(bio))
162 202
163 #define bio_set_prio(bio, prio) do { 203 #define bio_set_prio(bio, prio) do { \
164 WARN_ON(prio >= (1 << IOPRIO_BITS)); 204 WARN_ON(prio >= (1 << IOPRIO_BITS)); \
165 (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIF 205 (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \
166 (bio)->bi_rw |= ((unsigned long) (prio 206 (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \
167 } while (0) 207 } while (0)
168 208
169 /* 209 /*
170 * various member access, note that bio_data s 210 * various member access, note that bio_data should of course not be used
171 * on highmem page vectors 211 * on highmem page vectors
172 */ 212 */
173 #define bio_iovec_idx(bio, idx) (&((bio)->bi_i 213 #define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)]))
174 #define bio_iovec(bio) bio_iovec_idx( 214 #define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx)
175 #define bio_page(bio) bio_iovec((bio 215 #define bio_page(bio) bio_iovec((bio))->bv_page
176 #define bio_offset(bio) bio_iovec((bio 216 #define bio_offset(bio) bio_iovec((bio))->bv_offset
177 #define bio_segments(bio) ((bio)->bi_vcn 217 #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx)
178 #define bio_sectors(bio) ((bio)->bi_siz 218 #define bio_sectors(bio) ((bio)->bi_size >> 9)
179 #define bio_barrier(bio) ((bio)->bi_rw !! 219 #define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio))
180 #define bio_sync(bio) ((bio)->bi_rw <<
181 #define bio_failfast(bio) ((bio)->bi_rw <<
182 #define bio_rw_ahead(bio) ((bio)->bi_rw <<
183 #define bio_rw_meta(bio) ((bio)->bi_rw <<
184 #define bio_empty_barrier(bio) (bio_barrier(b <<
185 220
186 static inline unsigned int bio_cur_sectors(str !! 221 static inline unsigned int bio_cur_bytes(struct bio *bio)
187 { 222 {
188 if (bio->bi_vcnt) 223 if (bio->bi_vcnt)
189 return bio_iovec(bio)->bv_len !! 224 return bio_iovec(bio)->bv_len;
190 !! 225 else /* dataless requests such as discard */
191 return 0; !! 226 return bio->bi_size;
192 } 227 }
193 228
194 static inline void *bio_data(struct bio *bio) 229 static inline void *bio_data(struct bio *bio)
195 { 230 {
196 if (bio->bi_vcnt) 231 if (bio->bi_vcnt)
197 return page_address(bio_page(b 232 return page_address(bio_page(bio)) + bio_offset(bio);
198 233
199 return NULL; 234 return NULL;
200 } 235 }
201 236
>> 237 static inline int bio_has_allocated_vec(struct bio *bio)
>> 238 {
>> 239 return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs;
>> 240 }
>> 241
202 /* 242 /*
203 * will die 243 * will die
204 */ 244 */
205 #define bio_to_phys(bio) (page_to_phys( 245 #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))
206 #define bvec_to_phys(bv) (page_to_phys( 246 #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
207 247
208 /* 248 /*
209 * queues that have highmem support enabled ma 249 * queues that have highmem support enabled may still need to revert to
210 * PIO transfers occasionally and thus map hig 250 * PIO transfers occasionally and thus map high pages temporarily. For
211 * permanent PIO fall back, user is probably b 251 * permanent PIO fall back, user is probably better off disabling highmem
212 * I/O completely on that queue (see ide-dma f 252 * I/O completely on that queue (see ide-dma for example)
213 */ 253 */
214 #define __bio_kmap_atomic(bio, idx, kmtype) 254 #define __bio_kmap_atomic(bio, idx, kmtype) \
215 (kmap_atomic(bio_iovec_idx((bio), (idx 255 (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) + \
216 bio_iovec_idx((bio), (idx))->b 256 bio_iovec_idx((bio), (idx))->bv_offset)
217 257
218 #define __bio_kunmap_atomic(addr, kmtype) kunm 258 #define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype)
219 259
220 /* 260 /*
221 * merge helpers etc 261 * merge helpers etc
222 */ 262 */
223 263
224 #define __BVEC_END(bio) bio_iovec_idx( 264 #define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
225 #define __BVEC_START(bio) bio_iovec_idx( 265 #define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx)
226 266
>> 267 /* Default implementation of BIOVEC_PHYS_MERGEABLE */
>> 268 #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
>> 269 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
>> 270
227 /* 271 /*
228 * allow arch override, for eg virtualized arc 272 * allow arch override, for eg virtualized architectures (put in asm/io.h)
229 */ 273 */
230 #ifndef BIOVEC_PHYS_MERGEABLE 274 #ifndef BIOVEC_PHYS_MERGEABLE
231 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) 275 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
232 ((bvec_to_phys((vec1)) + (vec1)->bv_le !! 276 __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
233 #endif 277 #endif
234 278
235 #define BIOVEC_VIRT_MERGEABLE(vec1, vec2) <<
236 ((((bvec_to_phys((vec1)) + (vec1)->bv_ <<
237 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) 279 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
238 (((addr1) | (mask)) == (((addr2) - 1) 280 (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
239 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ 281 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
240 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), !! 282 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
241 #define BIO_SEG_BOUNDARY(q, b1, b2) \ 283 #define BIO_SEG_BOUNDARY(q, b1, b2) \
242 BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b 284 BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
243 285
244 #define bio_io_error(bio) bio_endio((bio), -EI 286 #define bio_io_error(bio) bio_endio((bio), -EIO)
245 287
246 /* 288 /*
247 * drivers should not use the __ version unles 289 * drivers should not use the __ version unless they _really_ want to
248 * run through the entire bio and not just pen 290 * run through the entire bio and not just pending pieces
249 */ 291 */
250 #define __bio_for_each_segment(bvl, bio, i, st 292 #define __bio_for_each_segment(bvl, bio, i, start_idx) \
251 for (bvl = bio_iovec_idx((bio), (start 293 for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \
252 i < (bio)->bi_vcnt; 294 i < (bio)->bi_vcnt; \
253 bvl++, i++) 295 bvl++, i++)
254 296
255 #define bio_for_each_segment(bvl, bio, i) 297 #define bio_for_each_segment(bvl, bio, i) \
256 __bio_for_each_segment(bvl, bio, i, (b 298 __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx)
257 299
258 /* 300 /*
259 * get a reference to a bio, so it won't disap 301 * get a reference to a bio, so it won't disappear. the intended use is
260 * something like: 302 * something like:
261 * 303 *
262 * bio_get(bio); 304 * bio_get(bio);
263 * submit_bio(rw, bio); 305 * submit_bio(rw, bio);
264 * if (bio->bi_flags ...) 306 * if (bio->bi_flags ...)
265 * do_something 307 * do_something
266 * bio_put(bio); 308 * bio_put(bio);
267 * 309 *
268 * without the bio_get(), it could potentially 310 * without the bio_get(), it could potentially complete I/O before submit_bio
269 * returns. and then bio would be freed memory 311 * returns. and then bio would be freed memory when if (bio->bi_flags ...)
270 * runs 312 * runs
271 */ 313 */
272 #define bio_get(bio) atomic_inc(&(bio)->bi_ 314 #define bio_get(bio) atomic_inc(&(bio)->bi_cnt)
273 315
>> 316 #if defined(CONFIG_BLK_DEV_INTEGRITY)
>> 317 /*
>> 318 * bio integrity payload
>> 319 */
>> 320 struct bio_integrity_payload {
>> 321 struct bio *bip_bio; /* parent bio */
>> 322
>> 323 sector_t bip_sector; /* virtual start sector */
>> 324
>> 325 void *bip_buf; /* generated integrity data */
>> 326 bio_end_io_t *bip_end_io; /* saved I/O completion fn */
>> 327
>> 328 unsigned int bip_size;
>> 329
>> 330 unsigned short bip_slab; /* slab the bip came from */
>> 331 unsigned short bip_vcnt; /* # of integrity bio_vecs */
>> 332 unsigned short bip_idx; /* current bip_vec index */
>> 333
>> 334 struct work_struct bip_work; /* I/O completion */
>> 335 struct bio_vec bip_vec[0]; /* embedded bvec array */
>> 336 };
>> 337 #endif /* CONFIG_BLK_DEV_INTEGRITY */
274 338
275 /* 339 /*
276 * A bio_pair is used when we need to split a 340 * A bio_pair is used when we need to split a bio.
277 * This can only happen for a bio that refers 341 * This can only happen for a bio that refers to just one
278 * page of data, and in the unusual situation 342 * page of data, and in the unusual situation when the
279 * page crosses a chunk/device boundary 343 * page crosses a chunk/device boundary
280 * 344 *
281 * The address of the master bio is stored in 345 * The address of the master bio is stored in bio1.bi_private
282 * The address of the pool the pair was alloca 346 * The address of the pool the pair was allocated from is stored
283 * in bio2.bi_private 347 * in bio2.bi_private
284 */ 348 */
285 struct bio_pair { 349 struct bio_pair {
286 struct bio bio1, bio2; !! 350 struct bio bio1, bio2;
287 struct bio_vec bv1, bv2; !! 351 struct bio_vec bv1, bv2;
288 atomic_t cnt; !! 352 #if defined(CONFIG_BLK_DEV_INTEGRITY)
289 int error; !! 353 struct bio_integrity_payload bip1, bip2;
>> 354 struct bio_vec iv1, iv2;
>> 355 #endif
>> 356 atomic_t cnt;
>> 357 int error;
290 }; 358 };
291 extern struct bio_pair *bio_split(struct bio * !! 359 extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
292 int first_se <<
293 extern mempool_t *bio_split_pool; <<
294 extern void bio_pair_release(struct bio_pair * 360 extern void bio_pair_release(struct bio_pair *dbio);
295 361
296 extern struct bio_set *bioset_create(int, int) !! 362 extern struct bio_set *bioset_create(unsigned int, unsigned int);
297 extern void bioset_free(struct bio_set *); 363 extern void bioset_free(struct bio_set *);
298 364
299 extern struct bio *bio_alloc(gfp_t, int); 365 extern struct bio *bio_alloc(gfp_t, int);
>> 366 extern struct bio *bio_kmalloc(gfp_t, int);
300 extern struct bio *bio_alloc_bioset(gfp_t, int 367 extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
301 extern void bio_put(struct bio *); 368 extern void bio_put(struct bio *);
302 extern void bio_free(struct bio *, struct bio_ 369 extern void bio_free(struct bio *, struct bio_set *);
303 370
304 extern void bio_endio(struct bio *, int); 371 extern void bio_endio(struct bio *, int);
305 struct request_queue; 372 struct request_queue;
306 extern int bio_phys_segments(struct request_qu 373 extern int bio_phys_segments(struct request_queue *, struct bio *);
307 extern int bio_hw_segments(struct request_queu <<
308 374
309 extern void __bio_clone(struct bio *, struct b 375 extern void __bio_clone(struct bio *, struct bio *);
310 extern struct bio *bio_clone(struct bio *, gfp 376 extern struct bio *bio_clone(struct bio *, gfp_t);
311 377
312 extern void bio_init(struct bio *); 378 extern void bio_init(struct bio *);
313 379
314 extern int bio_add_page(struct bio *, struct p 380 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
315 extern int bio_add_pc_page(struct request_queu 381 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
316 unsigned int, unsig 382 unsigned int, unsigned int);
317 extern int bio_get_nr_vecs(struct block_device 383 extern int bio_get_nr_vecs(struct block_device *);
>> 384 extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
318 extern struct bio *bio_map_user(struct request 385 extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
319 unsigned long, !! 386 unsigned long, unsigned int, int, gfp_t);
320 struct sg_iovec; 387 struct sg_iovec;
>> 388 struct rq_map_data;
321 extern struct bio *bio_map_user_iov(struct req 389 extern struct bio *bio_map_user_iov(struct request_queue *,
322 struct blo 390 struct block_device *,
323 struct sg_ !! 391 struct sg_iovec *, int, int, gfp_t);
324 extern void bio_unmap_user(struct bio *); 392 extern void bio_unmap_user(struct bio *);
325 extern struct bio *bio_map_kern(struct request 393 extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
326 gfp_t); 394 gfp_t);
>> 395 extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
>> 396 gfp_t, int);
327 extern void bio_set_pages_dirty(struct bio *bi 397 extern void bio_set_pages_dirty(struct bio *bio);
328 extern void bio_check_pages_dirty(struct bio * 398 extern void bio_check_pages_dirty(struct bio *bio);
329 extern struct bio *bio_copy_user(struct reques !! 399 extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
>> 400 unsigned long, unsigned int, int, gfp_t);
>> 401 extern struct bio *bio_copy_user_iov(struct request_queue *,
>> 402 struct rq_map_data *, struct sg_iovec *,
>> 403 int, int, gfp_t);
330 extern int bio_uncopy_user(struct bio *); 404 extern int bio_uncopy_user(struct bio *);
331 void zero_fill_bio(struct bio *bio); 405 void zero_fill_bio(struct bio *bio);
>> 406 extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
>> 407 extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int);
>> 408 extern unsigned int bvec_nr_vecs(unsigned short idx);
>> 409
>> 410 /*
>> 411 * Allow queuer to specify a completion CPU for this bio
>> 412 */
>> 413 static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
>> 414 {
>> 415 bio->bi_comp_cpu = cpu;
>> 416 }
>> 417
>> 418 /*
>> 419 * bio_set is used to allow other portions of the IO system to
>> 420 * allocate their own private memory pools for bio and iovec structures.
>> 421 * These memory pools in turn all allocate from the bio_slab
>> 422 * and the bvec_slabs[].
>> 423 */
>> 424 #define BIO_POOL_SIZE 2
>> 425 #define BIOVEC_NR_POOLS 6
>> 426 #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1)
>> 427
>> 428 struct bio_set {
>> 429 struct kmem_cache *bio_slab;
>> 430 unsigned int front_pad;
>> 431
>> 432 mempool_t *bio_pool;
>> 433 #if defined(CONFIG_BLK_DEV_INTEGRITY)
>> 434 mempool_t *bio_integrity_pool;
>> 435 #endif
>> 436 mempool_t *bvec_pool;
>> 437 };
>> 438
>> 439 struct biovec_slab {
>> 440 int nr_vecs;
>> 441 char *name;
>> 442 struct kmem_cache *slab;
>> 443 };
>> 444
>> 445 extern struct bio_set *fs_bio_set;
>> 446 extern struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly;
>> 447
>> 448 /*
>> 449 * a small number of entries is fine, not going to be performance critical.
>> 450 * basically we just need to survive
>> 451 */
>> 452 #define BIO_SPLIT_ENTRIES 2
332 453
333 #ifdef CONFIG_HIGHMEM 454 #ifdef CONFIG_HIGHMEM
334 /* 455 /*
335 * remember to add offset! and never ever reen !! 456 * remember never ever reenable interrupts between a bvec_kmap_irq and
336 * bvec_kmap_irq and bvec_kunmap_irq!! !! 457 * bvec_kunmap_irq!
337 * 458 *
338 * This function MUST be inlined - it plays wi 459 * This function MUST be inlined - it plays with the CPU interrupt flags.
339 */ 460 */
340 static inline char *bvec_kmap_irq(struct bio_v !! 461 static __always_inline char *bvec_kmap_irq(struct bio_vec *bvec,
>> 462 unsigned long *flags)
341 { 463 {
342 unsigned long addr; 464 unsigned long addr;
343 465
344 /* 466 /*
345 * might not be a highmem page, but th 467 * might not be a highmem page, but the preempt/irq count
346 * balancing is a lot nicer this way 468 * balancing is a lot nicer this way
347 */ 469 */
348 local_irq_save(*flags); 470 local_irq_save(*flags);
349 addr = (unsigned long) kmap_atomic(bve 471 addr = (unsigned long) kmap_atomic(bvec->bv_page, KM_BIO_SRC_IRQ);
350 472
351 BUG_ON(addr & ~PAGE_MASK); 473 BUG_ON(addr & ~PAGE_MASK);
352 474
353 return (char *) addr + bvec->bv_offset 475 return (char *) addr + bvec->bv_offset;
354 } 476 }
355 477
356 static inline void bvec_kunmap_irq(char *buffe !! 478 static __always_inline void bvec_kunmap_irq(char *buffer,
>> 479 unsigned long *flags)
357 { 480 {
358 unsigned long ptr = (unsigned long) bu 481 unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
359 482
360 kunmap_atomic((void *) ptr, KM_BIO_SRC 483 kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ);
361 local_irq_restore(*flags); 484 local_irq_restore(*flags);
362 } 485 }
363 486
364 #else 487 #else
365 #define bvec_kmap_irq(bvec, flags) (page_ 488 #define bvec_kmap_irq(bvec, flags) (page_address((bvec)->bv_page) + (bvec)->bv_offset)
366 #define bvec_kunmap_irq(buf, flags) do { * 489 #define bvec_kunmap_irq(buf, flags) do { *(flags) = 0; } while (0)
367 #endif 490 #endif
368 491
369 static inline char *__bio_kmap_irq(struct bio 492 static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
370 unsigned lo 493 unsigned long *flags)
371 { 494 {
372 return bvec_kmap_irq(bio_iovec_idx(bio 495 return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags);
373 } 496 }
374 #define __bio_kunmap_irq(buf, flags) bvec_k 497 #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
375 498
376 #define bio_kmap_irq(bio, flags) \ 499 #define bio_kmap_irq(bio, flags) \
377 __bio_kmap_irq((bio), (bio)->bi_idx, ( 500 __bio_kmap_irq((bio), (bio)->bi_idx, (flags))
378 #define bio_kunmap_irq(buf,flags) __bio_ 501 #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
379 502
>> 503 /*
>> 504 * Check whether this bio carries any data or not. A NULL bio is allowed.
>> 505 */
>> 506 static inline int bio_has_data(struct bio *bio)
>> 507 {
>> 508 return bio && bio->bi_io_vec != NULL;
>> 509 }
>> 510
>> 511 /*
>> 512 * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
>> 513 *
>> 514 * A bio_list anchors a singly-linked list of bios chained through the bi_next
>> 515 * member of the bio. The bio_list also caches the last list member to allow
>> 516 * fast access to the tail.
>> 517 */
>> 518 struct bio_list {
>> 519 struct bio *head;
>> 520 struct bio *tail;
>> 521 };
>> 522
>> 523 static inline int bio_list_empty(const struct bio_list *bl)
>> 524 {
>> 525 return bl->head == NULL;
>> 526 }
>> 527
>> 528 static inline void bio_list_init(struct bio_list *bl)
>> 529 {
>> 530 bl->head = bl->tail = NULL;
>> 531 }
>> 532
>> 533 #define bio_list_for_each(bio, bl) \
>> 534 for (bio = (bl)->head; bio; bio = bio->bi_next)
>> 535
>> 536 static inline unsigned bio_list_size(const struct bio_list *bl)
>> 537 {
>> 538 unsigned sz = 0;
>> 539 struct bio *bio;
>> 540
>> 541 bio_list_for_each(bio, bl)
>> 542 sz++;
>> 543
>> 544 return sz;
>> 545 }
>> 546
>> 547 static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
>> 548 {
>> 549 bio->bi_next = NULL;
>> 550
>> 551 if (bl->tail)
>> 552 bl->tail->bi_next = bio;
>> 553 else
>> 554 bl->head = bio;
>> 555
>> 556 bl->tail = bio;
>> 557 }
>> 558
>> 559 static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
>> 560 {
>> 561 bio->bi_next = bl->head;
>> 562
>> 563 bl->head = bio;
>> 564
>> 565 if (!bl->tail)
>> 566 bl->tail = bio;
>> 567 }
>> 568
>> 569 static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
>> 570 {
>> 571 if (!bl2->head)
>> 572 return;
>> 573
>> 574 if (bl->tail)
>> 575 bl->tail->bi_next = bl2->head;
>> 576 else
>> 577 bl->head = bl2->head;
>> 578
>> 579 bl->tail = bl2->tail;
>> 580 }
>> 581
>> 582 static inline void bio_list_merge_head(struct bio_list *bl,
>> 583 struct bio_list *bl2)
>> 584 {
>> 585 if (!bl2->head)
>> 586 return;
>> 587
>> 588 if (bl->head)
>> 589 bl2->tail->bi_next = bl->head;
>> 590 else
>> 591 bl->tail = bl2->tail;
>> 592
>> 593 bl->head = bl2->head;
>> 594 }
>> 595
>> 596 static inline struct bio *bio_list_peek(struct bio_list *bl)
>> 597 {
>> 598 return bl->head;
>> 599 }
>> 600
>> 601 static inline struct bio *bio_list_pop(struct bio_list *bl)
>> 602 {
>> 603 struct bio *bio = bl->head;
>> 604
>> 605 if (bio) {
>> 606 bl->head = bl->head->bi_next;
>> 607 if (!bl->head)
>> 608 bl->tail = NULL;
>> 609
>> 610 bio->bi_next = NULL;
>> 611 }
>> 612
>> 613 return bio;
>> 614 }
>> 615
>> 616 static inline struct bio *bio_list_get(struct bio_list *bl)
>> 617 {
>> 618 struct bio *bio = bl->head;
>> 619
>> 620 bl->head = bl->tail = NULL;
>> 621
>> 622 return bio;
>> 623 }
>> 624
>> 625 #if defined(CONFIG_BLK_DEV_INTEGRITY)
>> 626
>> 627 #define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
>> 628 #define bip_vec(bip) bip_vec_idx(bip, 0)
>> 629
>> 630 #define __bip_for_each_vec(bvl, bip, i, start_idx) \
>> 631 for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \
>> 632 i < (bip)->bip_vcnt; \
>> 633 bvl++, i++)
>> 634
>> 635 #define bip_for_each_vec(bvl, bip, i) \
>> 636 __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
>> 637
>> 638 #define bio_integrity(bio) (bio->bi_integrity != NULL)
>> 639
>> 640 extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
>> 641 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
>> 642 extern void bio_integrity_free(struct bio *, struct bio_set *);
>> 643 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
>> 644 extern int bio_integrity_enabled(struct bio *bio);
>> 645 extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
>> 646 extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
>> 647 extern int bio_integrity_prep(struct bio *);
>> 648 extern void bio_integrity_endio(struct bio *, int);
>> 649 extern void bio_integrity_advance(struct bio *, unsigned int);
>> 650 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
>> 651 extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
>> 652 extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t, struct bio_set *);
>> 653 extern int bioset_integrity_create(struct bio_set *, int);
>> 654 extern void bioset_integrity_free(struct bio_set *);
>> 655 extern void bio_integrity_init(void);
>> 656
>> 657 #else /* CONFIG_BLK_DEV_INTEGRITY */
>> 658
>> 659 #define bio_integrity(a) (0)
>> 660 #define bioset_integrity_create(a, b) (0)
>> 661 #define bio_integrity_prep(a) (0)
>> 662 #define bio_integrity_enabled(a) (0)
>> 663 #define bio_integrity_clone(a, b, c, d) (0)
>> 664 #define bioset_integrity_free(a) do { } while (0)
>> 665 #define bio_integrity_free(a, b) do { } while (0)
>> 666 #define bio_integrity_endio(a, b) do { } while (0)
>> 667 #define bio_integrity_advance(a, b) do { } while (0)
>> 668 #define bio_integrity_trim(a, b, c) do { } while (0)
>> 669 #define bio_integrity_split(a, b, c) do { } while (0)
>> 670 #define bio_integrity_set_tag(a, b, c) do { } while (0)
>> 671 #define bio_integrity_get_tag(a, b, c) do { } while (0)
>> 672 #define bio_integrity_init(a) do { } while (0)
>> 673
>> 674 #endif /* CONFIG_BLK_DEV_INTEGRITY */
>> 675
380 #endif /* CONFIG_BLOCK */ 676 #endif /* CONFIG_BLOCK */
381 #endif /* __LINUX_BIO_H */ 677 #endif /* __LINUX_BIO_H */
382 678
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