[dm-devel] [PATCH 06/18] bvec: add a bvec_kmap_local helper
From: Christoph Hellwig <hch@lst.de>
Date: 2021-06-15 13:27:58
Also in:
ceph-devel, linux-arch, linux-block, linux-mips, linuxppc-dev, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
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 <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <redacted> Reviewed-by: Ira Weiny <ira.weiny@intel.com> --- include/linux/bvec.h | 13 +++++++++++++ 1 file changed, 13 insertions(+)
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 <linux/highmem.h> #include <linux/bug.h> #include <linux/errno.h> #include <linux/limits.h>
@@ -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 */
--
2.30.2
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