bvec: add memcpy_{from,to}_bvec and memzero_bvec helper
Add helpers to perform common memory operation on a bvec. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Link: https://lore.kernel.org/r/20210727055646.118787-5-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>
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