mirror of
https://github.com/torvalds/linux.git
synced 2024-12-04 18:13:04 +00:00
103c19723c
The code used by btrfs_submit_bio only interacts with the rest of volumes.c through __btrfs_map_block (which itself is a more generic version of two exported helpers) and does not really have anything to do with volumes.c. Create a new bio.c file and a bio.h header going along with it for the btrfs_bio-based storage layer, which will grow even more going forward. Also update the file with my copyright notice given that a large part of the moved code was written or rewritten by me. Reviewed-by: Josef Bacik <josef@toxicpanda.com> 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>
128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/* 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);
|
|
|
|
/*
|
|
* Additional info to pass along bio.
|
|
*
|
|
* Mostly for btrfs specific features like csum and mirror_num.
|
|
*/
|
|
struct btrfs_bio {
|
|
unsigned int mirror_num:7;
|
|
|
|
/*
|
|
* Extra indicator for metadata bios.
|
|
* For some btrfs bios they use pages without a mapping, thus
|
|
* we can not rely on page->mapping->host to determine if
|
|
* it's a metadata bio.
|
|
*/
|
|
unsigned int is_metadata:1;
|
|
struct bvec_iter iter;
|
|
|
|
/* for direct I/O */
|
|
u64 file_offset;
|
|
|
|
/* @device is for stripe IO submission. */
|
|
struct btrfs_device *device;
|
|
union {
|
|
/* For data checksum verification. */
|
|
struct {
|
|
u8 *csum;
|
|
u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
|
|
};
|
|
|
|
/* For metadata 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 read end I/O handling */
|
|
struct work_struct end_io_work;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf,
|
|
btrfs_bio_end_io_t end_io, void *private);
|
|
struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size,
|
|
btrfs_bio_end_io_t end_io, void *private);
|
|
|
|
|
|
static inline void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status)
|
|
{
|
|
bbio->bio.bi_status = status;
|
|
bbio->end_io(bbio);
|
|
}
|
|
|
|
static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio)
|
|
{
|
|
if (bbio->is_metadata)
|
|
return;
|
|
if (bbio->csum != bbio->csum_inline) {
|
|
kfree(bbio->csum);
|
|
bbio->csum = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Iterate through a btrfs_bio (@bbio) on a per-sector basis.
|
|
*
|
|
* bvl - struct bio_vec
|
|
* bbio - struct btrfs_bio
|
|
* iters - struct bvec_iter
|
|
* bio_offset - unsigned int
|
|
*/
|
|
#define btrfs_bio_for_each_sector(fs_info, bvl, bbio, iter, bio_offset) \
|
|
for ((iter) = (bbio)->iter, (bio_offset) = 0; \
|
|
(iter).bi_size && \
|
|
(((bvl) = bio_iter_iovec((&(bbio)->bio), (iter))), 1); \
|
|
(bio_offset) += fs_info->sectorsize, \
|
|
bio_advance_iter_single(&(bbio)->bio, &(iter), \
|
|
(fs_info)->sectorsize))
|
|
|
|
void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
|
|
int mirror_num);
|
|
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
|