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