diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-08-04 11:56:20 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-08-16 10:50:32 -0600 |
| commit | 1113f0b69c6a98ff4e733c306a6658a31f8cbc49 (patch) | |
| tree | 250c53d803362f398ca08554a58508d3bb285f47 /include/linux/bvec.h | |
| parent | 889c05cc5834a1eef2dbe1e639cfd7a81c4f4c6d (diff) | |
bvec: add a bvec_virt helper
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>
Reviewed-by: Chaitanya Kulkarni <kch@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210804095634.460779-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/bvec.h')
| -rw-r--r-- | include/linux/bvec.h | 12 |
1 files changed, 12 insertions, 0 deletions
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 */ |