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 45 struct bio_vec { 46 struct page *bv_page; 47 unsigned int bv_len; 48 unsigned int bv_offset; 49 }; 50 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 *); 55 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; 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) 153 154 struct bio_pair { 155 struct bio bio1, bio2; 156 struct bio_vec bv1, bv2; 157 atomic_t cnt; 158 int error; 159 }; 160 161 struct request_queue; 162 163 struct 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