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 * Highlevel btrfs I/O structure. It is allocated by btrfs_bio_alloc and 30 * passed to btrfs_submit_bio for mapping to the physical devices. 31 */ 32 struct btrfs_bio { 33 /* 34 * Inode and offset into it that this I/O operates on. 35 * Only set for data I/O. 36 */ 37 struct btrfs_inode *inode; 38 u64 file_offset; 39 40 union { 41 /* 42 * Data checksumming and original I/O information for internal 43 * use in the btrfs_submit_bio machinery. 44 */ 45 struct { 46 u8 *csum; 47 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; 48 struct bvec_iter saved_iter; 49 }; 50 51 /* For metadata parentness verification. */ 52 struct btrfs_tree_parent_check parent_check; 53 }; 54 55 /* End I/O information supplied to btrfs_bio_alloc */ 56 btrfs_bio_end_io_t end_io; 57 void *private; 58 59 /* For internal use in read end I/O handling */ 60 unsigned int mirror_num; 61 atomic_t pending_ios; 62 struct work_struct end_io_work; 63 64 /* File system that this I/O operates on. */ 65 struct btrfs_fs_info *fs_info; 66 67 /* 68 * This member must come last, bio_alloc_bioset will allocate enough 69 * bytes for entire btrfs_bio but relies on bio being last. 70 */ 71 struct bio bio; 72 }; 73 74 static inline struct btrfs_bio *btrfs_bio(struct bio *bio) 75 { 76 return container_of(bio, struct btrfs_bio, bio); 77 } 78 79 int __init btrfs_bioset_init(void); 80 void __cold btrfs_bioset_exit(void); 81 82 void btrfs_bio_init(struct btrfs_bio *bbio, struct btrfs_fs_info *fs_info, 83 btrfs_bio_end_io_t end_io, void *private); 84 struct btrfs_bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf, 85 struct btrfs_fs_info *fs_info, 86 btrfs_bio_end_io_t end_io, void *private); 87 88 static inline void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status) 89 { 90 bbio->bio.bi_status = status; 91 bbio->end_io(bbio); 92 } 93 94 /* Bio only refers to one ordered extent. */ 95 #define REQ_BTRFS_ONE_ORDERED REQ_DRV 96 97 /* Submit using blkcg_punt_bio_submit. */ 98 #define REQ_BTRFS_CGROUP_PUNT REQ_FS_PRIVATE 99 100 void btrfs_submit_bio(struct btrfs_bio *bbio, int mirror_num); 101 void btrfs_submit_repair_write(struct btrfs_bio *bbio, int mirror_num, bool dev_replace); 102 int btrfs_repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, 103 u64 length, u64 logical, struct page *page, 104 unsigned int pg_offset, int mirror_num); 105 106 #endif 107