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>

diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index 5048df1b432ca2699a5bf6c5a604fe99868628f0..a9c16cabddc010f622324f9d3009c381da0247f0 100644 (file)
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -189,4 +189,19 @@ static inline char *bvec_kmap_local(struct bio_vec *bvec)
        return kmap_local_page(bvec->bv_page) + bvec->bv_offset;
 }
 
+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);
+}
+
+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);
+}
+
+static inline void memzero_bvec(struct bio_vec *bvec)
+{
+       memzero_page(bvec->bv_page, bvec->bv_offset, bvec->bv_len);
+}
+
 #endif /* __LINUX_BVEC_H */