diff options
| author | Martin K. Petersen <martin.petersen@oracle.com> | 2008-06-17 18:59:56 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-07-03 13:21:13 +0200 |
| commit | 51d654e1d885607a6edd02b337105fa5c28b6d33 (patch) | |
| tree | 64e87fa9b3b28cb10be635cf4edc76ccf39befe1 /include | |
| parent | a144ff09bc52ef3f3684ed23eadc9c7c0e57b3aa (diff) | |
block: Globalize bio_set and bio_vec_slab
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bio.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index 61c15eaf3fb..49dfb3cb746 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -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 /* |