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

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
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+18 −0
Original line number Diff line number Diff line
@@ -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

/**
+1 −0
Original line number Diff line number Diff line
@@ -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 *);