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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: Venkat R.B <vrbagal1@linux.vnet.ibm.com> Tested-by: Venkat R.B <vrbagal1@linux.vnet.ibm.com> Tested-by: Li Wang <liwang@redhat.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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parent
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commit
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18
block/bio.c
18
block/bio.c
@ -1967,6 +1967,24 @@ bad:
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}
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EXPORT_SYMBOL(bioset_init);
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/*
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* Initialize and setup a new bio_set, based on the settings from
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* another bio_set.
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*/
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int bioset_init_from_src(struct bio_set *bs, struct bio_set *src)
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{
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int flags;
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flags = 0;
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if (src->bvec_pool.min_nr)
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flags |= BIOSET_NEED_BVECS;
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if (src->rescue_workqueue)
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flags |= BIOSET_NEED_RESCUER;
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return bioset_init(bs, src->bio_pool.min_nr, src->front_pad, flags);
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}
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EXPORT_SYMBOL(bioset_init_from_src);
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#ifdef CONFIG_BLK_CGROUP
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/**
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@ -417,6 +417,7 @@ enum {
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extern int bioset_init(struct bio_set *, unsigned int, unsigned int, int flags);
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extern void bioset_exit(struct bio_set *);
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extern int biovec_init_pool(mempool_t *pool, int pool_entries);
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extern int bioset_init_from_src(struct bio_set *bs, struct bio_set *src);
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extern struct bio *bio_alloc_bioset(gfp_t, unsigned int, struct bio_set *);
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extern void bio_put(struct bio *);
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