/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2007 Oracle. All rights reserved. * Copyright (C) 2022 Christoph Hellwig. */ #ifndef BTRFS_BIO_H #define BTRFS_BIO_H #include <linux/bio.h> #include <linux/workqueue.h> #include "tree-checker.h" struct btrfs_bio; struct btrfs_fs_info; #define BTRFS_BIO_INLINE_CSUM_SIZE 64 /* * Maximum number of sectors for a single bio to limit the size of the * checksum array. This matches the number of bio_vecs per bio and thus the * I/O size for buffered I/O. */ #define BTRFS_MAX_BIO_SECTORS (256) typedef void (*btrfs_bio_end_io_t)(struct btrfs_bio *bbio); /* * Highlevel btrfs I/O structure. It is allocated by btrfs_bio_alloc and * passed to btrfs_submit_bio for mapping to the physical devices. */ struct btrfs_bio { /* * Inode and offset into it that this I/O operates on. * Only set for data I/O. */ struct btrfs_inode *inode; u64 file_offset; union { /* * For data reads: checksumming and original I/O information. * (for internal use in the btrfs_submit_bio machinery only) */ struct { u8 *csum; u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; struct bvec_iter saved_iter; }; /* * For data writes: * - ordered extent covering the bio * - pointer to the checksums for this bio * - original physical address from the allocator * (for zone append only) */ struct { struct btrfs_ordered_extent *ordered; struct btrfs_ordered_sum *sums; u64 orig_physical; }; /* For metadata reads: parentness verification. */ struct btrfs_tree_parent_check parent_check; }; /* End I/O information supplied to btrfs_bio_alloc */ btrfs_bio_end_io_t end_io; void *private; /* For internal use in read end I/O handling */ unsigned int mirror_num; atomic_t pending_ios; struct work_struct end_io_work; /* File system that this I/O operates on. */ struct btrfs_fs_info *fs_info; /* * This member must come last, bio_alloc_bioset will allocate enough * bytes for entire btrfs_bio but relies on bio being last. */ struct bio bio; }; static inline struct btrfs_bio *btrfs_bio(struct bio *bio) { return container_of(bio, struct btrfs_bio, bio); } int __init btrfs_bioset_init(void); void __cold btrfs_bioset_exit(void); void btrfs_bio_init(struct btrfs_bio *bbio, struct btrfs_fs_info *fs_info, btrfs_bio_end_io_t end_io, void *private); struct btrfs_bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf, struct btrfs_fs_info *fs_info, btrfs_bio_end_io_t end_io, void *private); void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status); /* Submit using blkcg_punt_bio_submit. */ #define REQ_BTRFS_CGROUP_PUNT REQ_FS_PRIVATE void btrfs_submit_bio(struct btrfs_bio *bbio, int mirror_num); void btrfs_submit_repair_write(struct btrfs_bio *bbio, int mirror_num, bool dev_replace); int btrfs_repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, u64 length, u64 logical, struct page *page, unsigned int pg_offset, int mirror_num); #endif