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block: Globalize bio_set and bio_vec_slab

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Move struct bio_set and biovec_slab definitions to bio.h so they can
be used outside of bio.c.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Martin K. Petersen 2008-06-17 18:59:56 +02:00 • committed by Jens Axboe
parent a144ff09bc
commit 51d654e1d8
2 changed files with 31 additions and 28 deletions
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30
fs/bio.c
View file

@ -28,25 +28,10 @@
#include <linux/blktrace_api.h> #include <linux/blktrace_api.h>
#include <scsi/sg.h> /* for struct sg_iovec */ #include <scsi/sg.h> /* for struct sg_iovec */
#define BIO_POOL_SIZE 2
static struct kmem_cache *bio_slab __read_mostly; static struct kmem_cache *bio_slab __read_mostly;
#define BIOVEC_NR_POOLS 6
/*
* a small number of entries is fine, not going to be performance critical.
* basically we just need to survive
*/
#define BIO_SPLIT_ENTRIES 2
mempool_t *bio_split_pool __read_mostly; mempool_t *bio_split_pool __read_mostly;
struct biovec_slab {
int nr_vecs;
char *name;
struct kmem_cache *slab;
};
/* /*
* if you change this list, also change bvec_alloc or things will * if you change this list, also change bvec_alloc or things will
* break badly! cannot be bigger than what you can fit into an * break badly! cannot be bigger than what you can fit into an
@ -59,24 +44,13 @@ static struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly = {
}; };
#undef BV #undef BV
/*
* bio_set is used to allow other portions of the IO system to
* allocate their own private memory pools for bio and iovec structures.
* These memory pools in turn all allocate from the bio_slab
* and the bvec_slabs[].
*/
struct bio_set {
mempool_t *bio_pool;
mempool_t *bvec_pools[BIOVEC_NR_POOLS];
};
/* /*
* fs_bio_set is the bio_set containing bio and iovec memory pools used by * fs_bio_set is the bio_set containing bio and iovec memory pools used by
* IO code that does not need private memory pools. * IO code that does not need private memory pools.
*/ */
static struct bio_set *fs_bio_set; struct bio_set *fs_bio_set;
static inline struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx, struct bio_set *bs) struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx, struct bio_set *bs)
{ {
struct bio_vec *bvl; struct bio_vec *bvl;

29
include/linux/bio.h
View file

@ -333,6 +333,35 @@ extern struct bio *bio_copy_user_iov(struct request_queue *, struct sg_iovec *,
int, int); int, int);
extern int bio_uncopy_user(struct bio *); extern int bio_uncopy_user(struct bio *);
void zero_fill_bio(struct bio *bio); void zero_fill_bio(struct bio *bio);
extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
/*
* bio_set is used to allow other portions of the IO system to
* allocate their own private memory pools for bio and iovec structures.
* These memory pools in turn all allocate from the bio_slab
* and the bvec_slabs[].
*/
#define BIO_POOL_SIZE 2
#define BIOVEC_NR_POOLS 6
struct bio_set {
mempool_t *bio_pool;
mempool_t *bvec_pools[BIOVEC_NR_POOLS];
};
struct biovec_slab {
int nr_vecs;
char *name;
struct kmem_cache *slab;
};
extern struct bio_set *fs_bio_set;
/*
* a small number of entries is fine, not going to be performance critical.
* basically we just need to survive
*/
#define BIO_SPLIT_ENTRIES 2
#ifdef CONFIG_HIGHMEM #ifdef CONFIG_HIGHMEM
/* /*