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The device field is only used by the simple end I/O handler, and for that it can simply be stored in the bi_private field of the bio, which is currently used for the fs_info that can be retrieved through bbio->inode as well. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/* 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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unsigned int mirror_num:7;
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/*
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* Extra indicator for metadata bios.
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* For some btrfs bios they use pages without a mapping, thus
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* we can not rely on page->mapping->host to determine if
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* it's a metadata bio.
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*/
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unsigned int is_metadata:1;
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struct bvec_iter iter;
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/* Inode and offset into it that this I/O operates on. */
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struct btrfs_inode *inode;
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u64 file_offset;
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union {
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/* For data checksum verification. */
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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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};
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/* For metadata 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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struct work_struct end_io_work;
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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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struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf,
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struct btrfs_inode *inode,
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btrfs_bio_end_io_t end_io, void *private);
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struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size,
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struct btrfs_inode *inode,
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btrfs_bio_end_io_t end_io, void *private);
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static inline void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status)
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{
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bbio->bio.bi_status = status;
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bbio->end_io(bbio);
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}
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void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
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int mirror_num);
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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 page *page,
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unsigned int pg_offset, int mirror_num);
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#endif
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