| Message ID | 20210804095634.460779-2-hch@lst.de |
|---|---|
| State | New |
| Headers | show |
| Series | [01/15] bvec: add a bvec_virt helper | expand |
On 8/4/2021 2:56 AM, Christoph Hellwig wrote: > Add a helper to get the virtual address for a bvec. This avoids that > all callers need to know about the page + offset representation. > > Signed-off-by: Christoph Hellwig<hch@lst.de> Looks good. Reviewed-by: Chaitanya Kulkarni <kch@kernel.org> -- -ck
Christoph, > Add a helper to get the virtual address for a bvec. This avoids that > all callers need to know about the page + offset representation. Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> -- Martin K. Petersen Oracle Linux Engineering
diff --git a/include/linux/bvec.h b/include/linux/bvec.h index f9fa43b940ff..0e9bdd42dafb 100644 --- a/include/linux/bvec.h +++ b/include/linux/bvec.h @@ -229,4 +229,16 @@ static inline void memzero_bvec(struct bio_vec *bvec) memzero_page(bvec->bv_page, bvec->bv_offset, bvec->bv_len); } +/** + * bvec_virt - return the virtual address for a bvec + * @bvec: bvec to return the virtual address for + * + * Note: the caller must ensure that @bvec->bv_page is not a highmem page. + */ +static inline void *bvec_virt(struct bio_vec *bvec) +{ + WARN_ON_ONCE(PageHighMem(bvec->bv_page)); + return page_address(bvec->bv_page) + bvec->bv_offset; +} + #endif /* __LINUX_BVEC_H */
Add a helper to get the virtual address for a bvec. This avoids that all callers need to know about the page + offset representation. Signed-off-by: Christoph Hellwig <hch@lst.de> --- include/linux/bvec.h | 12 ++++++++++++ 1 file changed, 12 insertions(+)