1/****************************************************************************
2 ****************************************************************************
3 ***
4 ***   This header was automatically generated from a Linux kernel header
5 ***   of the same name, to make information necessary for userspace to
6 ***   call into the kernel available to libc.  It contains only constants,
7 ***   structures, and macros generated from the original header, and thus,
8 ***   contains no copyrightable information.
9 ***
10 ****************************************************************************
11 ****************************************************************************/
12#ifndef __LINUX_BIO_H
13#define __LINUX_BIO_H
14
15#include <linux/highmem.h>
16#include <linux/mempool.h>
17#include <linux/ioprio.h>
18
19#include <asm/io.h>
20
21#if defined(BIO_VMERGE_MAX_SIZE) && defined(BIO_VMERGE_BOUNDARY)
22#define BIOVEC_VIRT_START_SIZE(x) (bvec_to_phys(x) & (BIO_VMERGE_BOUNDARY - 1))
23#define BIOVEC_VIRT_OVERSIZE(x) ((x) > BIO_VMERGE_MAX_SIZE)
24#else
25#define BIOVEC_VIRT_START_SIZE(x) 0
26#define BIOVEC_VIRT_OVERSIZE(x) 0
27#endif
28
29#ifndef BIO_VMERGE_BOUNDARY
30#define BIO_VMERGE_BOUNDARY 0
31#endif
32
33#define BIO_DEBUG
34
35#ifdef BIO_DEBUG
36#define BIO_BUG_ON BUG_ON
37#else
38#define BIO_BUG_ON
39#endif
40
41#define BIO_MAX_PAGES 256
42#define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT)
43#define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9)
44
45struct bio_vec {
46 struct page *bv_page;
47 unsigned int bv_len;
48 unsigned int bv_offset;
49};
50
51struct bio_set;
52struct bio;
53typedef int (bio_end_io_t) (struct bio *, unsigned int, int);
54typedef void (bio_destructor_t) (struct bio *);
55
56struct bio {
57 sector_t bi_sector;
58 struct bio *bi_next;
59 struct block_device *bi_bdev;
60 unsigned long bi_flags;
61 unsigned long bi_rw;
62
63 unsigned short bi_vcnt;
64 unsigned short bi_idx;
65
66 unsigned short bi_phys_segments;
67
68 unsigned short bi_hw_segments;
69
70 unsigned int bi_size;
71
72 unsigned int bi_hw_front_size;
73 unsigned int bi_hw_back_size;
74
75 unsigned int bi_max_vecs;
76
77 struct bio_vec *bi_io_vec;
78
79 bio_end_io_t *bi_end_io;
80 atomic_t bi_cnt;
81
82 void *bi_private;
83
84 bio_destructor_t *bi_destructor;
85};
86
87#define BIO_UPTODATE 0
88#define BIO_RW_BLOCK 1
89#define BIO_EOF 2
90#define BIO_SEG_VALID 3
91#define BIO_CLONED 4
92#define BIO_BOUNCED 5
93#define BIO_USER_MAPPED 6
94#define BIO_EOPNOTSUPP 7
95#define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
96
97#define BIO_POOL_BITS (4)
98#define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS)
99#define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET)
100#define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET)
101
102#define BIO_RW 0
103#define BIO_RW_AHEAD 1
104#define BIO_RW_BARRIER 2
105#define BIO_RW_FAILFAST 3
106#define BIO_RW_SYNC 4
107
108#define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS)
109#define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT)
110#define bio_prio_valid(bio) ioprio_valid(bio_prio(bio))
111
112#define bio_set_prio(bio, prio) do {   WARN_ON(prio >= (1 << IOPRIO_BITS));   (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1);   (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT);  } while (0)
113
114#define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)]))
115#define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx)
116#define bio_page(bio) bio_iovec((bio))->bv_page
117#define bio_offset(bio) bio_iovec((bio))->bv_offset
118#define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx)
119#define bio_sectors(bio) ((bio)->bi_size >> 9)
120#define bio_cur_sectors(bio) (bio_iovec(bio)->bv_len >> 9)
121#define bio_data(bio) (page_address(bio_page((bio))) + bio_offset((bio)))
122#define bio_barrier(bio) ((bio)->bi_rw & (1 << BIO_RW_BARRIER))
123#define bio_sync(bio) ((bio)->bi_rw & (1 << BIO_RW_SYNC))
124#define bio_failfast(bio) ((bio)->bi_rw & (1 << BIO_RW_FAILFAST))
125#define bio_rw_ahead(bio) ((bio)->bi_rw & (1 << BIO_RW_AHEAD))
126
127#define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))
128#define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
129
130#define __bio_kmap_atomic(bio, idx, kmtype)   (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) +   bio_iovec_idx((bio), (idx))->bv_offset)
131
132#define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype)
133
134#define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
135#define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx)
136
137#ifndef BIOVEC_PHYS_MERGEABLE
138#define BIOVEC_PHYS_MERGEABLE(vec1, vec2)   ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
139#endif
140
141#define BIOVEC_VIRT_MERGEABLE(vec1, vec2)   ((((bvec_to_phys((vec1)) + (vec1)->bv_len) | bvec_to_phys((vec2))) & (BIO_VMERGE_BOUNDARY - 1)) == 0)
142#define __BIO_SEG_BOUNDARY(addr1, addr2, mask)   (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
143#define BIOVEC_SEG_BOUNDARY(q, b1, b2)   __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, (q)->seg_boundary_mask)
144#define BIO_SEG_BOUNDARY(q, b1, b2)   BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
145
146#define bio_io_error(bio, bytes) bio_endio((bio), (bytes), -EIO)
147
148#define __bio_for_each_segment(bvl, bio, i, start_idx)   for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx);   i < (bio)->bi_vcnt;   bvl++, i++)
149
150#define bio_for_each_segment(bvl, bio, i)   __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx)
151
152#define bio_get(bio) atomic_inc(&(bio)->bi_cnt)
153
154struct bio_pair {
155 struct bio bio1, bio2;
156 struct bio_vec bv1, bv2;
157 atomic_t cnt;
158 int error;
159};
160
161struct request_queue;
162
163struct sg_iovec;
164
165#define bvec_kmap_irq(bvec, flags) (page_address((bvec)->bv_page) + (bvec)->bv_offset)
166#define bvec_kunmap_irq(buf, flags) do { *(flags) = 0; } while (0)
167
168#define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
169#define bio_kmap_irq(bio, flags)   __bio_kmap_irq((bio), (bio)->bi_idx, (flags))
170#define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
171#endif
172