Commit 1113f0b6 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

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: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarChaitanya Kulkarni <kch@kernel.org>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210804095634.460779-2-hch@lst.de


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 889c05cc

include/linux/bvec.h

+12 −0
Original line number Diff line number Diff line
@@ -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 */