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block: move two bvec structure into bvec.h 

This patch moves 'struct bio_vec' and 'struct bvec_iter'
into 'include/linux/bvec.h', then always include this header
into 'include/linux/blk_types.h'.

With this change, both 'struct bvec_iter' and bvec iterator
helpers don't depend on CONFIG_BLOCK any more, then we can
use bvec iterator to implement iterate_bvec(): lib/iov_iter.c.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Tested-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2016-05-30 21:34:30 +08:00 committed by Jens Axboe
parent 8fc554552c
commit 0781e79eb2
3 changed files with 23 additions and 23 deletions
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1
include/linux/bio.h
View File

@ -31,7 +31,6 @@
/* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */
#include <linux/blk_types.h>
#include <linux/bvec.h>
#define BIO_DEBUG

22
include/linux/blk_types.h
View File

@ -6,6 +6,7 @@
#define __LINUX_BLK_TYPES_H
#include <linux/types.h>
#include <linux/bvec.h>
struct bio_set;
struct bio;
@ -17,28 +18,7 @@ struct cgroup_subsys_state;
typedef void (bio_end_io_t) (struct bio *);
typedef void (bio_destructor_t) (struct bio *);
/*
* was unsigned short, but we might as well be ready for > 64kB I/O pages
*/
struct bio_vec {
struct page *bv_page;
unsigned int bv_len;
unsigned int bv_offset;
};
#ifdef CONFIG_BLOCK
struct bvec_iter {
sector_t bi_sector; /* device address in 512 byte
sectors */
unsigned int bi_size; /* residual I/O count */
unsigned int bi_idx; /* current index into bvl_vec */
unsigned int bi_bvec_done; /* number of bytes completed in
current bvec */
};
/*
* main unit of I/O for the block layer and lower layers (ie drivers and
* stacking drivers)

23
include/linux/bvec.h
View File

@ -20,7 +20,28 @@
#ifndef __LINUX_BVEC_ITER_H
#define __LINUX_BVEC_ITER_H
#include <linux/blk_types.h>
#include <linux/kernel.h>
#include <linux/bug.h>
/*
* was unsigned short, but we might as well be ready for > 64kB I/O pages
*/
struct bio_vec {
struct page *bv_page;
unsigned int bv_len;
unsigned int bv_offset;
};
struct bvec_iter {
sector_t bi_sector; /* device address in 512 byte
sectors */
unsigned int bi_size; /* residual I/O count */
unsigned int bi_idx; /* current index into bvl_vec */
unsigned int bi_bvec_done; /* number of bytes completed in
current bvec */
};
/*
* various member access, note that bio_data should of course not be used