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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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29
include/linux/bio.h
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@ -333,6 +333,35 @@ extern struct bio *bio_copy_user_iov(struct request_queue *, struct sg_iovec *,
int, int);
extern int bio_uncopy_user(struct 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
/*