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Commit 57fb233f authored by Kent Overstreet's avatar Kent Overstreet
Browse files

block: Reorder struct bio_set 



This is prep work for the next patch, which embeds a struct bio_list in
struct bio_set.

Signed-off-by: default avatarKent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
parent a937536b

include/linux/bio.h

+33 −33
Original line number Diff line number Diff line
@@ -298,39 +298,6 @@ static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } 
static inline void bio_disassociate_task(struct bio *bio) { }

#endif	/* CONFIG_BLK_CGROUP */



/*

 * 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

#define BIOVEC_MAX_IDX	(BIOVEC_NR_POOLS - 1)



struct bio_set {

	struct kmem_cache *bio_slab;

	unsigned int front_pad;



	mempool_t *bio_pool;

#if defined(CONFIG_BLK_DEV_INTEGRITY)

	mempool_t *bio_integrity_pool;

#endif

	mempool_t *bvec_pool;

};



struct biovec_slab {

	int nr_vecs;

	char *name;

	struct kmem_cache *slab;

};



/*

 * 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

/*

 * remember never ever reenable interrupts between a bvec_kmap_irq and
@@ -527,6 +494,39 @@ static inline struct bio *bio_list_get(struct bio_list *bl) 
	return bio;

}



/*

 * 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

#define BIOVEC_MAX_IDX	(BIOVEC_NR_POOLS - 1)



struct bio_set {

	struct kmem_cache *bio_slab;

	unsigned int front_pad;



	mempool_t *bio_pool;

#if defined(CONFIG_BLK_DEV_INTEGRITY)

	mempool_t *bio_integrity_pool;

#endif

	mempool_t *bvec_pool;

};



struct biovec_slab {

	int nr_vecs;

	char *name;

	struct kmem_cache *slab;

};



/*

 * a small number of entries is fine, not going to be performance critical.

 * basically we just need to survive

 */

#define BIO_SPLIT_ENTRIES 2



#if defined(CONFIG_BLK_DEV_INTEGRITY)



#define bip_vec_idx(bip, idx)	(&(bip->bip_vec[(idx)]))