[dm-devel] [PATCH 07/18] bvec: add memcpy_{from, to}_bvec and memzero_bvec helper
From: Christoph Hellwig <hch@lst.de>
Date: 2021-06-15 13:28:53
Also in:
ceph-devel, linux-arch, linux-block, linux-mips, linuxppc-dev, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
Add helpers to perform common memory operation on a bvec. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <redacted> Reviewed-by: Ira Weiny <ira.weiny@intel.com> --- include/linux/bvec.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+)
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 */
--
2.30.2
--
dm-devel mailing list
dm-devel@redhat.com
https://listman.redhat.com/mailman/listinfo/dm-devel