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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> <<
26 <<
27 #ifdef CONFIG_BLOCK <<
28 25
29 /* Platforms may set this to teach the BIO lay 26 /* Platforms may set this to teach the BIO layer about IOMMU hardware. */
30 #include <asm/io.h> 27 #include <asm/io.h>
31 28
32 #if defined(BIO_VMERGE_MAX_SIZE) && defined(BI 29 #if defined(BIO_VMERGE_MAX_SIZE) && defined(BIO_VMERGE_BOUNDARY)
33 #define BIOVEC_VIRT_START_SIZE(x) (bvec_to_phy 30 #define BIOVEC_VIRT_START_SIZE(x) (bvec_to_phys(x) & (BIO_VMERGE_BOUNDARY - 1))
34 #define BIOVEC_VIRT_OVERSIZE(x) ((x) > BIO_VME 31 #define BIOVEC_VIRT_OVERSIZE(x) ((x) > BIO_VMERGE_MAX_SIZE)
35 #else 32 #else
36 #define BIOVEC_VIRT_START_SIZE(x) 0 33 #define BIOVEC_VIRT_START_SIZE(x) 0
37 #define BIOVEC_VIRT_OVERSIZE(x) 0 34 #define BIOVEC_VIRT_OVERSIZE(x) 0
38 #endif 35 #endif
39 36
40 #ifndef BIO_VMERGE_BOUNDARY 37 #ifndef BIO_VMERGE_BOUNDARY
41 #define BIO_VMERGE_BOUNDARY 0 38 #define BIO_VMERGE_BOUNDARY 0
42 #endif 39 #endif
43 40
44 #define BIO_DEBUG 41 #define BIO_DEBUG
45 42
46 #ifdef BIO_DEBUG 43 #ifdef BIO_DEBUG
47 #define BIO_BUG_ON BUG_ON 44 #define BIO_BUG_ON BUG_ON
48 #else 45 #else
49 #define BIO_BUG_ON 46 #define BIO_BUG_ON
50 #endif 47 #endif
51 48
52 #define BIO_MAX_PAGES 256 !! 49 #define BIO_MAX_PAGES (256)
53 #define BIO_MAX_SIZE (BIO_MAX_PAGES 50 #define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT)
54 #define BIO_MAX_SECTORS (BIO_MAX_SIZE 51 #define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9)
55 52
56 /* 53 /*
57 * was unsigned short, but we might as well be 54 * was unsigned short, but we might as well be ready for > 64kB I/O pages
58 */ 55 */
59 struct bio_vec { 56 struct bio_vec {
60 struct page *bv_page; 57 struct page *bv_page;
61 unsigned int bv_len; 58 unsigned int bv_len;
62 unsigned int bv_offset; 59 unsigned int bv_offset;
63 }; 60 };
64 61
65 struct bio_set; <<
66 struct bio; 62 struct bio;
67 typedef void (bio_end_io_t) (struct bio *, int !! 63 typedef int (bio_end_io_t) (struct bio *, unsigned int, int);
68 typedef void (bio_destructor_t) (struct bio *) 64 typedef void (bio_destructor_t) (struct bio *);
69 65
70 /* 66 /*
71 * main unit of I/O for the block layer and lo 67 * main unit of I/O for the block layer and lower layers (ie drivers and
72 * stacking drivers) 68 * stacking drivers)
73 */ 69 */
74 struct bio { 70 struct bio {
75 sector_t bi_sector; !! 71 sector_t bi_sector;
76 <<
77 struct bio *bi_next; 72 struct bio *bi_next; /* request queue link */
78 struct block_device *bi_bdev; 73 struct block_device *bi_bdev;
79 unsigned long bi_flags; 74 unsigned long bi_flags; /* status, command, etc */
80 unsigned long bi_rw; 75 unsigned long bi_rw; /* bottom bits READ/WRITE,
81 76 * top bits priority
82 77 */
83 78
84 unsigned short bi_vcnt; 79 unsigned short bi_vcnt; /* how many bio_vec's */
85 unsigned short bi_idx; 80 unsigned short bi_idx; /* current index into bvl_vec */
86 81
87 /* Number of segments in this BIO afte 82 /* Number of segments in this BIO after
88 * physical address coalescing is perf 83 * physical address coalescing is performed.
89 */ 84 */
90 unsigned short bi_phys_segmen 85 unsigned short bi_phys_segments;
91 86
92 /* Number of segments after physical a 87 /* Number of segments after physical and DMA remapping
93 * hardware coalescing is performed. 88 * hardware coalescing is performed.
94 */ 89 */
95 unsigned short bi_hw_segments 90 unsigned short bi_hw_segments;
96 91
97 unsigned int bi_size; 92 unsigned int bi_size; /* residual I/O count */
98 93
99 /* 94 /*
100 * To keep track of the max hw size, w 95 * To keep track of the max hw size, we account for the
101 * sizes of the first and last virtual 96 * sizes of the first and last virtually mergeable segments
102 * in this bio 97 * in this bio
103 */ 98 */
104 unsigned int bi_hw_front_si 99 unsigned int bi_hw_front_size;
105 unsigned int bi_hw_back_siz 100 unsigned int bi_hw_back_size;
106 101
107 unsigned int bi_max_vecs; 102 unsigned int bi_max_vecs; /* max bvl_vecs we can hold */
108 103
109 struct bio_vec *bi_io_vec; 104 struct bio_vec *bi_io_vec; /* the actual vec list */
110 105
111 bio_end_io_t *bi_end_io; 106 bio_end_io_t *bi_end_io;
112 atomic_t bi_cnt; 107 atomic_t bi_cnt; /* pin count */
113 108
114 void *bi_private; 109 void *bi_private;
115 110
116 bio_destructor_t *bi_destructor 111 bio_destructor_t *bi_destructor; /* destructor */
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 /* nr_hw_seg 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 */
130 #define bio_flagged(bio, flag) ((bio)->bi_fla 125 #define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
131 126
132 /* 127 /*
133 * top 4 bits of bio flags indicate the pool t 128 * top 4 bits of bio flags indicate the pool this bio came from
134 */ 129 */
135 #define BIO_POOL_BITS (4) 130 #define BIO_POOL_BITS (4)
136 #define BIO_POOL_OFFSET (BITS_PER_LONG 131 #define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS)
137 #define BIO_POOL_MASK (1UL << BIO_PO 132 #define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET)
138 #define BIO_POOL_IDX(bio) ((bio)->bi_fla 133 #define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET)
139 134
140 /* 135 /*
141 * bio bi_rw flags 136 * bio bi_rw flags
142 * 137 *
143 * bit 0 -- read (not set) or write (set) 138 * bit 0 -- read (not set) or write (set)
144 * bit 1 -- rw-ahead when set 139 * bit 1 -- rw-ahead when set
145 * bit 2 -- barrier 140 * bit 2 -- barrier
146 * bit 3 -- fail fast, don't want low level dr 141 * bit 3 -- fail fast, don't want low level driver retries
147 * bit 4 -- synchronous I/O hint: the block la 142 * bit 4 -- synchronous I/O hint: the block layer will unplug immediately
148 */ 143 */
149 #define BIO_RW 0 144 #define BIO_RW 0
150 #define BIO_RW_AHEAD 1 145 #define BIO_RW_AHEAD 1
151 #define BIO_RW_BARRIER 2 146 #define BIO_RW_BARRIER 2
152 #define BIO_RW_FAILFAST 3 147 #define BIO_RW_FAILFAST 3
153 #define BIO_RW_SYNC 4 148 #define BIO_RW_SYNC 4
154 #define BIO_RW_META 5 <<
155 <<
156 /* <<
157 * upper 16 bits of bi_rw define the io priori <<
158 */ <<
159 #define BIO_PRIO_SHIFT (8 * sizeof(unsigned l <<
160 #define bio_prio(bio) ((bio)->bi_rw >> BIO_P <<
161 #define bio_prio_valid(bio) ioprio_valid(b <<
162 <<
163 #define bio_set_prio(bio, prio) do { <<
164 WARN_ON(prio >= (1 << IOPRIO_BITS)); <<
165 (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIF <<
166 (bio)->bi_rw |= ((unsigned long) (prio <<
167 } while (0) <<
168 149
169 /* 150 /*
170 * various member access, note that bio_data s 151 * various member access, note that bio_data should of course not be used
171 * on highmem page vectors 152 * on highmem page vectors
172 */ 153 */
173 #define bio_iovec_idx(bio, idx) (&((bio)->bi_i 154 #define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)]))
174 #define bio_iovec(bio) bio_iovec_idx( 155 #define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx)
175 #define bio_page(bio) bio_iovec((bio 156 #define bio_page(bio) bio_iovec((bio))->bv_page
176 #define bio_offset(bio) bio_iovec((bio 157 #define bio_offset(bio) bio_iovec((bio))->bv_offset
177 #define bio_segments(bio) ((bio)->bi_vcn 158 #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx)
178 #define bio_sectors(bio) ((bio)->bi_siz 159 #define bio_sectors(bio) ((bio)->bi_size >> 9)
>> 160 #define bio_cur_sectors(bio) (bio_iovec(bio)->bv_len >> 9)
>> 161 #define bio_data(bio) (page_address(bio_page((bio))) + bio_offset((bio)))
179 #define bio_barrier(bio) ((bio)->bi_rw 162 #define bio_barrier(bio) ((bio)->bi_rw & (1 << BIO_RW_BARRIER))
180 #define bio_sync(bio) ((bio)->bi_rw 163 #define bio_sync(bio) ((bio)->bi_rw & (1 << BIO_RW_SYNC))
181 #define bio_failfast(bio) ((bio)->bi_rw 164 #define bio_failfast(bio) ((bio)->bi_rw & (1 << BIO_RW_FAILFAST))
182 #define bio_rw_ahead(bio) ((bio)->bi_rw 165 #define bio_rw_ahead(bio) ((bio)->bi_rw & (1 << BIO_RW_AHEAD))
183 #define bio_rw_meta(bio) ((bio)->bi_rw <<
184 #define bio_empty_barrier(bio) (bio_barrier(b <<
185 <<
186 static inline unsigned int bio_cur_sectors(str <<
187 { <<
188 if (bio->bi_vcnt) <<
189 return bio_iovec(bio)->bv_len <<
190 <<
191 return 0; <<
192 } <<
193 <<
194 static inline void *bio_data(struct bio *bio) <<
195 { <<
196 if (bio->bi_vcnt) <<
197 return page_address(bio_page(b <<
198 <<
199 return NULL; <<
200 } <<
201 166
202 /* 167 /*
203 * will die 168 * will die
204 */ 169 */
205 #define bio_to_phys(bio) (page_to_phys( 170 #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( 171 #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
207 172
208 /* 173 /*
209 * queues that have highmem support enabled ma 174 * queues that have highmem support enabled may still need to revert to
210 * PIO transfers occasionally and thus map hig 175 * PIO transfers occasionally and thus map high pages temporarily. For
211 * permanent PIO fall back, user is probably b 176 * permanent PIO fall back, user is probably better off disabling highmem
212 * I/O completely on that queue (see ide-dma f 177 * I/O completely on that queue (see ide-dma for example)
213 */ 178 */
214 #define __bio_kmap_atomic(bio, idx, kmtype) 179 #define __bio_kmap_atomic(bio, idx, kmtype) \
215 (kmap_atomic(bio_iovec_idx((bio), (idx 180 (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) + \
216 bio_iovec_idx((bio), (idx))->b 181 bio_iovec_idx((bio), (idx))->bv_offset)
217 182
218 #define __bio_kunmap_atomic(addr, kmtype) kunm 183 #define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype)
219 184
220 /* 185 /*
221 * merge helpers etc 186 * merge helpers etc
222 */ 187 */
223 188
224 #define __BVEC_END(bio) bio_iovec_idx( 189 #define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
225 #define __BVEC_START(bio) bio_iovec_idx( 190 #define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx)
226 191
227 /* 192 /*
228 * allow arch override, for eg virtualized arc 193 * allow arch override, for eg virtualized architectures (put in asm/io.h)
229 */ 194 */
230 #ifndef BIOVEC_PHYS_MERGEABLE 195 #ifndef BIOVEC_PHYS_MERGEABLE
231 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) 196 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
232 ((bvec_to_phys((vec1)) + (vec1)->bv_le 197 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
233 #endif 198 #endif
234 199
235 #define BIOVEC_VIRT_MERGEABLE(vec1, vec2) 200 #define BIOVEC_VIRT_MERGEABLE(vec1, vec2) \
236 ((((bvec_to_phys((vec1)) + (vec1)->bv_ 201 ((((bvec_to_phys((vec1)) + (vec1)->bv_len) | bvec_to_phys((vec2))) & (BIO_VMERGE_BOUNDARY - 1)) == 0)
237 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) 202 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
238 (((addr1) | (mask)) == (((addr2) - 1) 203 (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
239 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ 204 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
240 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), 205 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, (q)->seg_boundary_mask)
241 #define BIO_SEG_BOUNDARY(q, b1, b2) \ 206 #define BIO_SEG_BOUNDARY(q, b1, b2) \
242 BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b 207 BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
243 208
244 #define bio_io_error(bio) bio_endio((bio), -EI !! 209 #define bio_io_error(bio, bytes) bio_endio((bio), (bytes), -EIO)
245 210
246 /* 211 /*
247 * drivers should not use the __ version unles 212 * drivers should not use the __ version unless they _really_ want to
248 * run through the entire bio and not just pen 213 * run through the entire bio and not just pending pieces
249 */ 214 */
250 #define __bio_for_each_segment(bvl, bio, i, st 215 #define __bio_for_each_segment(bvl, bio, i, start_idx) \
251 for (bvl = bio_iovec_idx((bio), (start 216 for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \
252 i < (bio)->bi_vcnt; 217 i < (bio)->bi_vcnt; \
253 bvl++, i++) 218 bvl++, i++)
254 219
255 #define bio_for_each_segment(bvl, bio, i) 220 #define bio_for_each_segment(bvl, bio, i) \
256 __bio_for_each_segment(bvl, bio, i, (b 221 __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx)
257 222
258 /* 223 /*
259 * get a reference to a bio, so it won't disap 224 * get a reference to a bio, so it won't disappear. the intended use is
260 * something like: 225 * something like:
261 * 226 *
262 * bio_get(bio); 227 * bio_get(bio);
263 * submit_bio(rw, bio); 228 * submit_bio(rw, bio);
264 * if (bio->bi_flags ...) 229 * if (bio->bi_flags ...)
265 * do_something 230 * do_something
266 * bio_put(bio); 231 * bio_put(bio);
267 * 232 *
268 * without the bio_get(), it could potentially 233 * without the bio_get(), it could potentially complete I/O before submit_bio
269 * returns. and then bio would be freed memory 234 * returns. and then bio would be freed memory when if (bio->bi_flags ...)
270 * runs 235 * runs
271 */ 236 */
272 #define bio_get(bio) atomic_inc(&(bio)->bi_ 237 #define bio_get(bio) atomic_inc(&(bio)->bi_cnt)
273 238
274 239
275 /* 240 /*
276 * A bio_pair is used when we need to split a 241 * A bio_pair is used when we need to split a bio.
277 * This can only happen for a bio that refers 242 * This can only happen for a bio that refers to just one
278 * page of data, and in the unusual situation 243 * page of data, and in the unusual situation when the
279 * page crosses a chunk/device boundary 244 * page crosses a chunk/device boundary
280 * 245 *
281 * The address of the master bio is stored in 246 * The address of the master bio is stored in bio1.bi_private
282 * The address of the pool the pair was alloca 247 * The address of the pool the pair was allocated from is stored
283 * in bio2.bi_private 248 * in bio2.bi_private
284 */ 249 */
285 struct bio_pair { 250 struct bio_pair {
286 struct bio bio1, bio2; 251 struct bio bio1, bio2;
287 struct bio_vec bv1, bv2; 252 struct bio_vec bv1, bv2;
288 atomic_t cnt; 253 atomic_t cnt;
289 int error; 254 int error;
290 }; 255 };
291 extern struct bio_pair *bio_split(struct bio * 256 extern struct bio_pair *bio_split(struct bio *bi, mempool_t *pool,
292 int first_se 257 int first_sectors);
293 extern mempool_t *bio_split_pool; 258 extern mempool_t *bio_split_pool;
294 extern void bio_pair_release(struct bio_pair * 259 extern void bio_pair_release(struct bio_pair *dbio);
295 260
296 extern struct bio_set *bioset_create(int, int) !! 261 extern struct bio *bio_alloc(int, int);
297 extern void bioset_free(struct bio_set *); <<
298 <<
299 extern struct bio *bio_alloc(gfp_t, int); <<
300 extern struct bio *bio_alloc_bioset(gfp_t, int <<
301 extern void bio_put(struct bio *); 262 extern void bio_put(struct bio *);
302 extern void bio_free(struct bio *, struct bio_ <<
303 263
304 extern void bio_endio(struct bio *, int); !! 264 extern void bio_endio(struct bio *, unsigned int, int);
305 struct request_queue; 265 struct request_queue;
306 extern int bio_phys_segments(struct request_qu 266 extern int bio_phys_segments(struct request_queue *, struct bio *);
307 extern int bio_hw_segments(struct request_queu 267 extern int bio_hw_segments(struct request_queue *, struct bio *);
308 268
309 extern void __bio_clone(struct bio *, struct b 269 extern void __bio_clone(struct bio *, struct bio *);
310 extern struct bio *bio_clone(struct bio *, gfp !! 270 extern struct bio *bio_clone(struct bio *, int);
311 271
312 extern void bio_init(struct bio *); 272 extern void bio_init(struct bio *);
313 273
314 extern int bio_add_page(struct bio *, struct p 274 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
315 extern int bio_add_pc_page(struct request_queu <<
316 unsigned int, unsig <<
317 extern int bio_get_nr_vecs(struct block_device 275 extern int bio_get_nr_vecs(struct block_device *);
318 extern struct bio *bio_map_user(struct request 276 extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
319 unsigned long, 277 unsigned long, unsigned int, int);
320 struct sg_iovec; <<
321 extern struct bio *bio_map_user_iov(struct req <<
322 struct blo <<
323 struct sg_ <<
324 extern void bio_unmap_user(struct bio *); 278 extern void bio_unmap_user(struct bio *);
325 extern struct bio *bio_map_kern(struct request <<
326 gfp_t); <<
327 extern void bio_set_pages_dirty(struct bio *bi 279 extern void bio_set_pages_dirty(struct bio *bio);
328 extern void bio_check_pages_dirty(struct bio * 280 extern void bio_check_pages_dirty(struct bio *bio);
329 extern struct bio *bio_copy_user(struct reques 281 extern struct bio *bio_copy_user(struct request_queue *, unsigned long, unsigned int, int);
330 extern int bio_uncopy_user(struct bio *); 282 extern int bio_uncopy_user(struct bio *);
331 void zero_fill_bio(struct bio *bio); <<
332 283
333 #ifdef CONFIG_HIGHMEM 284 #ifdef CONFIG_HIGHMEM
334 /* 285 /*
335 * remember to add offset! and never ever reen 286 * remember to add offset! and never ever reenable interrupts between a
336 * bvec_kmap_irq and bvec_kunmap_irq!! 287 * bvec_kmap_irq and bvec_kunmap_irq!!
337 * 288 *
338 * This function MUST be inlined - it plays wi 289 * This function MUST be inlined - it plays with the CPU interrupt flags.
>> 290 * Hence the `extern inline'.
339 */ 291 */
340 static inline char *bvec_kmap_irq(struct bio_v !! 292 extern inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
341 { 293 {
342 unsigned long addr; 294 unsigned long addr;
343 295
344 /* 296 /*
345 * might not be a highmem page, but th 297 * might not be a highmem page, but the preempt/irq count
346 * balancing is a lot nicer this way 298 * balancing is a lot nicer this way
347 */ 299 */
348 local_irq_save(*flags); 300 local_irq_save(*flags);
349 addr = (unsigned long) kmap_atomic(bve 301 addr = (unsigned long) kmap_atomic(bvec->bv_page, KM_BIO_SRC_IRQ);
350 302
351 BUG_ON(addr & ~PAGE_MASK); 303 BUG_ON(addr & ~PAGE_MASK);
352 304
353 return (char *) addr + bvec->bv_offset 305 return (char *) addr + bvec->bv_offset;
354 } 306 }
355 307
356 static inline void bvec_kunmap_irq(char *buffe !! 308 extern inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
357 { 309 {
358 unsigned long ptr = (unsigned long) bu 310 unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
359 311
360 kunmap_atomic((void *) ptr, KM_BIO_SRC 312 kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ);
361 local_irq_restore(*flags); 313 local_irq_restore(*flags);
362 } 314 }
363 315
364 #else 316 #else
365 #define bvec_kmap_irq(bvec, flags) (page_ 317 #define bvec_kmap_irq(bvec, flags) (page_address((bvec)->bv_page) + (bvec)->bv_offset)
366 #define bvec_kunmap_irq(buf, flags) do { * 318 #define bvec_kunmap_irq(buf, flags) do { *(flags) = 0; } while (0)
367 #endif 319 #endif
368 320
369 static inline char *__bio_kmap_irq(struct bio !! 321 extern inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
370 unsigned lo 322 unsigned long *flags)
371 { 323 {
372 return bvec_kmap_irq(bio_iovec_idx(bio 324 return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags);
373 } 325 }
374 #define __bio_kunmap_irq(buf, flags) bvec_k 326 #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
375 327
376 #define bio_kmap_irq(bio, flags) \ 328 #define bio_kmap_irq(bio, flags) \
377 __bio_kmap_irq((bio), (bio)->bi_idx, ( 329 __bio_kmap_irq((bio), (bio)->bi_idx, (flags))
378 #define bio_kunmap_irq(buf,flags) __bio_ 330 #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
379 331
380 #endif /* CONFIG_BLOCK */ <<
381 #endif /* __LINUX_BIO_H */ 332 #endif /* __LINUX_BIO_H */
382 333
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