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