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