diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-07-27 07:56:35 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-08-02 13:37:27 -0600 |
| commit | f93a181af40b159aabea2ccf1a0496e9280be2d5 (patch) | |
| tree | 6cf0563b4bb64119ff985f986144bed6f5c777ac | |
| parent | e6e7471706dc42cbe0e01278540c0730138d43e5 (diff) | |
| download | lwn-f93a181af40b159aabea2ccf1a0496e9280be2d5.tar.gz lwn-f93a181af40b159aabea2ccf1a0496e9280be2d5.zip | |
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.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | include/linux/bvec.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/include/linux/bvec.h b/include/linux/bvec.h index f8710af18eef..f9fa43b940ff 100644 --- a/include/linux/bvec.h +++ b/include/linux/bvec.h @@ -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 */ |