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: NVenkat R.B <vrbagal1@linux.vnet.ibm.com> Tested-by: NVenkat R.B <vrbagal1@linux.vnet.ibm.com> Tested-by: NLi Wang <liwang@redhat.com> Reviewed-by: NMike Snitzer <snitzer@redhat.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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