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 * For data reads: checksumming and original I/O information. 43 * (for internal use in the btrfs_submit_bio machinery only) 44 */ 45 struct { 46 u8 *csum; 47 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; 48 struct bvec_iter saved_iter; 49 }; 50 51 /* 52 * For data writes: 53 * - ordered extent covering the bio 54 * - pointer to the checksums for this bio 55 * - original physical address from the allocator 56 * (for zone append only) 57 */ 58 struct { 59 struct btrfs_ordered_extent *ordered; 60 struct btrfs_ordered_sum *sums; 61 u64 orig_physical; 62 }; 63 64 /* For metadata reads: parentness verification. */ 65 struct btrfs_tree_parent_check parent_check; 66 }; 67 68 /* End I/O information supplied to btrfs_bio_alloc */ 69 btrfs_bio_end_io_t end_io; 70 void *private; 71 72 /* For internal use in read end I/O handling */ 73 unsigned int mirror_num; 74 atomic_t pending_ios; 75 struct work_struct end_io_work; 76 77 /* File system that this I/O operates on. */ 78 struct btrfs_fs_info *fs_info; 79 80 /* 81 * This member must come last, bio_alloc_bioset will allocate enough 82 * bytes for entire btrfs_bio but relies on bio being last. 83 */ 84 struct bio bio; 85 }; 86 87 static inline struct btrfs_bio *btrfs_bio(struct bio *bio) 88 { 89 return container_of(bio, struct btrfs_bio, bio); 90 } 91 92 int __init btrfs_bioset_init(void); 93 void __cold btrfs_bioset_exit(void); 94 95 void btrfs_bio_init(struct btrfs_bio *bbio, struct btrfs_fs_info *fs_info, 96 btrfs_bio_end_io_t end_io, void *private); 97 struct btrfs_bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf, 98 struct btrfs_fs_info *fs_info, 99 btrfs_bio_end_io_t end_io, void *private); 100 void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status); 101 102 /* Submit using blkcg_punt_bio_submit. */ 103 #define REQ_BTRFS_CGROUP_PUNT REQ_FS_PRIVATE 104 105 void btrfs_submit_bio(struct btrfs_bio *bbio, int mirror_num); 106 void btrfs_submit_repair_write(struct btrfs_bio *bbio, int mirror_num, bool dev_replace); 107 int btrfs_repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, 108 u64 length, u64 logical, struct page *page, 109 unsigned int pg_offset, int mirror_num); 110 111 #endif 112