From e6e7471706dc42cbe0e01278540c0730138d43e5 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 27 Jul 2021 07:56:34 +0200 Subject: bvec: add a bvec_kmap_local helper Add a helper to call kmap_local_page on a bvec. There is no need for an unmap helper given that kunmap_local accept any address in the mapped page. Signed-off-by: Christoph Hellwig Reviewed-by: Chaitanya Kulkarni Reviewed-by: Martin K. Petersen Reviewed-by: Ira Weiny Link: https://lore.kernel.org/r/20210727055646.118787-4-hch@lst.de Signed-off-by: Jens Axboe --- include/linux/bvec.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'include/linux/bvec.h') diff --git a/include/linux/bvec.h b/include/linux/bvec.h index 883faf5f1523..f8710af18eef 100644 --- a/include/linux/bvec.h +++ b/include/linux/bvec.h @@ -7,6 +7,7 @@ #ifndef __LINUX_BVEC_H #define __LINUX_BVEC_H +#include #include #include #include @@ -183,4 +184,16 @@ static inline void bvec_advance(const struct bio_vec *bvec, } } +/** + * bvec_kmap_local - map a bvec into the kernel virtual address space + * @bvec: bvec to map + * + * Must be called on single-page bvecs only. Call kunmap_local on the returned + * address to unmap. + */ +static inline void *bvec_kmap_local(struct bio_vec *bvec) +{ + return kmap_local_page(bvec->bv_page) + bvec->bv_offset; +} + #endif /* __LINUX_BVEC_H */ -- cgit v1.2.3