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
15 #include <linux/highmem.h>
16 #include <linux/mempool.h>
17 #include <linux/ioprio.h>
19 #include <asm/io.h>
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
29 #ifndef BIO_VMERGE_BOUNDARY
30 #define BIO_VMERGE_BOUNDARY 0
31 #endif
33 #define BIO_DEBUG
35 #ifdef BIO_DEBUG
36 #define BIO_BUG_ON BUG_ON
37 #else
38 #define BIO_BUG_ON
39 #endif
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)
45 struct bio_vec {
46 struct page *bv_page;
47 unsigned int bv_len;
48 unsigned int bv_offset;
49 };
51 struct bio_set;
52 struct bio;
53 typedef int (bio_end_io_t) (struct bio *, unsigned int, int);
54 typedef void (bio_destructor_t) (struct bio *);
56 struct 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;
63 unsigned short bi_vcnt;
64 unsigned short bi_idx;
66 unsigned short bi_phys_segments;
68 unsigned short bi_hw_segments;
70 unsigned int bi_size;
72 unsigned int bi_hw_front_size;
73 unsigned int bi_hw_back_size;
75 unsigned int bi_max_vecs;
77 struct bio_vec *bi_io_vec;
79 bio_end_io_t *bi_end_io;
80 atomic_t bi_cnt;
82 void *bi_private;
84 bio_destructor_t *bi_destructor;
85 };
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)))
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)
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
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))
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)
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))
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)
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)
132 #define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype)
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)
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
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)))
146 #define bio_io_error(bio, bytes) bio_endio((bio), (bytes), -EIO)
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++)
150 #define bio_for_each_segment(bvl, bio, i) __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx)
152 #define bio_get(bio) atomic_inc(&(bio)->bi_cnt)
154 struct bio_pair {
155 struct bio bio1, bio2;
156 struct bio_vec bv1, bv2;
157 atomic_t cnt;
158 int error;
159 };
161 struct request_queue;
163 struct sg_iovec;
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)
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