1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2007 Oracle. All rights reserved. 4 * Copyright (C) 2022 Christoph Hellwig. 5 */ 6 7 #ifndef BTRFS_BIO_H 8 #define BTRFS_BIO_H 9 10 #include <linux/bio.h> 11 #include <linux/workqueue.h> 12 #include "tree-checker.h" 13 14 struct btrfs_bio; 15 struct btrfs_fs_info; 16 17 #define BTRFS_BIO_INLINE_CSUM_SIZE 64 18 19 /* 20 * Maximum number of sectors for a single bio to limit the size of the 21 * checksum array. This matches the number of bio_vecs per bio and thus the 22 * I/O size for buffered I/O. 23 */ 24 #define BTRFS_MAX_BIO_SECTORS (256) 25 26 typedef void (*btrfs_bio_end_io_t)(struct btrfs_bio *bbio); 27 28 /* 29 * Additional info to pass along bio. 30 * 31 * Mostly for btrfs specific features like csum and mirror_num. 32 */ 33 struct btrfs_bio { 34 unsigned int mirror_num:7; 35 36 /* 37 * Extra indicator for metadata bios. 38 * For some btrfs bios they use pages without a mapping, thus 39 * we can not rely on page->mapping->host to determine if 40 * it's a metadata bio. 41 */ 42 unsigned int is_metadata:1; 43 struct bvec_iter iter; 44 45 /* for direct I/O */ 46 u64 file_offset; 47 48 /* @device is for stripe IO submission. */ 49 struct btrfs_device *device; 50 union { 51 /* For data checksum verification. */ 52 struct { 53 u8 *csum; 54 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; 55 }; 56 57 /* For metadata parentness verification. */ 58 struct btrfs_tree_parent_check parent_check; 59 }; 60 61 /* End I/O information supplied to btrfs_bio_alloc */ 62 btrfs_bio_end_io_t end_io; 63 void *private; 64 65 /* For read end I/O handling */ 66 struct work_struct end_io_work; 67 68 /* 69 * This member must come last, bio_alloc_bioset will allocate enough 70 * bytes for entire btrfs_bio but relies on bio being last. 71 */ 72 struct bio bio; 73 }; 74 75 static inline struct btrfs_bio *btrfs_bio(struct bio *bio) 76 { 77 return container_of(bio, struct btrfs_bio, bio); 78 } 79 80 int __init btrfs_bioset_init(void); 81 void __cold btrfs_bioset_exit(void); 82 83 struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf, 84 btrfs_bio_end_io_t end_io, void *private); 85 struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size, 86 btrfs_bio_end_io_t end_io, void *private); 87 88 89 static inline void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status) 90 { 91 bbio->bio.bi_status = status; 92 bbio->end_io(bbio); 93 } 94 95 static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio) 96 { 97 if (bbio->is_metadata) 98 return; 99 if (bbio->csum != bbio->csum_inline) { 100 kfree(bbio->csum); 101 bbio->csum = NULL; 102 } 103 } 104 105 /* 106 * Iterate through a btrfs_bio (@bbio) on a per-sector basis. 107 * 108 * bvl - struct bio_vec 109 * bbio - struct btrfs_bio 110 * iters - struct bvec_iter 111 * bio_offset - unsigned int 112 */ 113 #define btrfs_bio_for_each_sector(fs_info, bvl, bbio, iter, bio_offset) \ 114 for ((iter) = (bbio)->iter, (bio_offset) = 0; \ 115 (iter).bi_size && \ 116 (((bvl) = bio_iter_iovec((&(bbio)->bio), (iter))), 1); \ 117 (bio_offset) += fs_info->sectorsize, \ 118 bio_advance_iter_single(&(bbio)->bio, &(iter), \ 119 (fs_info)->sectorsize)) 120 121 void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, 122 int mirror_num); 123 int btrfs_repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, 124 u64 length, u64 logical, struct page *page, 125 unsigned int pg_offset, int mirror_num); 126 127 #endif 128