Commit 28e89fd9 authored by Jens Axboe's avatar Jens Axboe

block: add bioset_init_from_src() helper

Add a helper that allows a caller to initialize a new bio_set,
using the settings from an existing bio_set.
Reported-by: default avatarVenkat R.B <vrbagal1@linux.vnet.ibm.com>
Tested-by: default avatarVenkat R.B <vrbagal1@linux.vnet.ibm.com>
Tested-by: default avatarLi Wang <liwang@redhat.com>
Reviewed-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent c04fa44b
......@@ -1967,6 +1967,24 @@ int bioset_init(struct bio_set *bs,
}
EXPORT_SYMBOL(bioset_init);
/*
* Initialize and setup a new bio_set, based on the settings from
* another bio_set.
*/
int bioset_init_from_src(struct bio_set *bs, struct bio_set *src)
{
int flags;
flags = 0;
if (src->bvec_pool.min_nr)
flags |= BIOSET_NEED_BVECS;
if (src->rescue_workqueue)
flags |= BIOSET_NEED_RESCUER;
return bioset_init(bs, src->bio_pool.min_nr, src->front_pad, flags);
}
EXPORT_SYMBOL(bioset_init_from_src);
#ifdef CONFIG_BLK_CGROUP
/**
......
......@@ -417,6 +417,7 @@ enum {
extern int bioset_init(struct bio_set *, unsigned int, unsigned int, int flags);
extern void bioset_exit(struct bio_set *);
extern int biovec_init_pool(mempool_t *pool, int pool_entries);
extern int bioset_init_from_src(struct bio_set *bs, struct bio_set *src);
extern struct bio *bio_alloc_bioset(gfp_t, unsigned int, struct bio_set *);
extern void bio_put(struct bio *);
......
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