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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>
This commit is contained in:
Christoph Hellwig 2021-08-04 11:56:20 +02:00 committed by Jens Axboe
parent 889c05cc58
commit 1113f0b69c
1 changed files with 12 additions and 0 deletions
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12
include/linux/bvec.h
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@ -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 */