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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_H8#define BTRFS_BIO_H9 10#include <linux/types.h>11#include <linux/bio.h>12#include <linux/workqueue.h>13#include "tree-checker.h"14 15struct btrfs_bio;16struct btrfs_fs_info;17struct btrfs_inode;18 19#define BTRFS_BIO_INLINE_CSUM_SIZE 6420 21/*22 * Maximum number of sectors for a single bio to limit the size of the23 * checksum array. This matches the number of bio_vecs per bio and thus the24 * I/O size for buffered I/O.25 */26#define BTRFS_MAX_BIO_SECTORS (256)27 28typedef void (*btrfs_bio_end_io_t)(struct btrfs_bio *bbio);29 30/*31 * Highlevel btrfs I/O structure. It is allocated by btrfs_bio_alloc and32 * passed to btrfs_submit_bbio() for mapping to the physical devices.33 */34struct btrfs_bio {35 /*36 * Inode and offset into it that this I/O operates on.37 * Only set for data I/O.38 */39 struct btrfs_inode *inode;40 u64 file_offset;41 42 union {43 /*44 * For data reads: checksumming and original I/O information.45 * (for internal use in the btrfs_submit_bbio() machinery only)46 */47 struct {48 u8 *csum;49 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];50 struct bvec_iter saved_iter;51 };52 53 /*54 * For data writes:55 * - ordered extent covering the bio56 * - pointer to the checksums for this bio57 * - original physical address from the allocator58 * (for zone append only)59 */60 struct {61 struct btrfs_ordered_extent *ordered;62 struct btrfs_ordered_sum *sums;63 u64 orig_physical;64 };65 66 /* For metadata reads: parentness verification. */67 struct btrfs_tree_parent_check parent_check;68 };69 70 /* End I/O information supplied to btrfs_bio_alloc */71 btrfs_bio_end_io_t end_io;72 void *private;73 74 /* For internal use in read end I/O handling */75 unsigned int mirror_num;76 atomic_t pending_ios;77 struct work_struct end_io_work;78 79 /* File system that this I/O operates on. */80 struct btrfs_fs_info *fs_info;81 82 /* Save the first error status of split bio. */83 blk_status_t status;84 85 /*86 * This member must come last, bio_alloc_bioset will allocate enough87 * bytes for entire btrfs_bio but relies on bio being last.88 */89 struct bio bio;90};91 92static inline struct btrfs_bio *btrfs_bio(struct bio *bio)93{94 return container_of(bio, struct btrfs_bio, bio);95}96 97int __init btrfs_bioset_init(void);98void __cold btrfs_bioset_exit(void);99 100void btrfs_bio_init(struct btrfs_bio *bbio, struct btrfs_fs_info *fs_info,101 btrfs_bio_end_io_t end_io, void *private);102struct btrfs_bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf,103 struct btrfs_fs_info *fs_info,104 btrfs_bio_end_io_t end_io, void *private);105void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status);106 107/* Submit using blkcg_punt_bio_submit. */108#define REQ_BTRFS_CGROUP_PUNT REQ_FS_PRIVATE109 110void btrfs_submit_bbio(struct btrfs_bio *bbio, int mirror_num);111void btrfs_submit_repair_write(struct btrfs_bio *bbio, int mirror_num, bool dev_replace);112int btrfs_repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,113 u64 length, u64 logical, struct folio *folio,114 unsigned int folio_offset, int mirror_num);115 116#endif117