Commit f93a181a authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

bvec: add memcpy_{from,to}_bvec and memzero_bvec helper 



Add helpers to perform common memory operation on a bvec.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: default avatarIra Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20210727055646.118787-5-hch@lst.de


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent e6e74717

include/linux/bvec.h

+33 −0
Original line number Diff line number Diff line
@@ -196,4 +196,37 @@ static inline void *bvec_kmap_local(struct bio_vec *bvec) 
	return kmap_local_page(bvec->bv_page) + bvec->bv_offset;

}



/**

 * memcpy_from_bvec - copy data from a bvec

 * @bvec: bvec to copy from

 *

 * Must be called on single-page bvecs only.

 */

static inline void memcpy_from_bvec(char *to, struct bio_vec *bvec)

{

	memcpy_from_page(to, bvec->bv_page, bvec->bv_offset, bvec->bv_len);

}



/**

 * memcpy_to_bvec - copy data to a bvec

 * @bvec: bvec to copy to

 *

 * Must be called on single-page bvecs only.

 */

static inline void memcpy_to_bvec(struct bio_vec *bvec, const char *from)

{

	memcpy_to_page(bvec->bv_page, bvec->bv_offset, from, bvec->bv_len);

}



/**

 * memzero_bvec - zero all data in a bvec

 * @bvec: bvec to zero

 *

 * Must be called on single-page bvecs only.

 */

static inline void memzero_bvec(struct bio_vec *bvec)

{

	memzero_page(bvec->bv_page, bvec->bv_offset, bvec->bv_len);

}



#endif /* __LINUX_BVEC_H */