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block: add a bvec_phys helper

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Get callers out of poking into bvec internals a bit more.  Not a huge win
right now, but with the proposed new DMA mapping API we might end up with
a lot more of this otherwise.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20240706075228.2350978-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2024-07-06 09:52:17 +02:00
committed by Jens Axboe
parent bf86bcdb40
commit 25f76c3db2
4 changed files with 18 additions and 4 deletions
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14
include/linux/bvec.h
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@@ -280,4 +280,18 @@ static inline void *bvec_virt(struct bio_vec *bvec)
return page_address(bvec->bv_page) + bvec->bv_offset;
}
/**
* bvec_phys - return the physical address for a bvec
* @bvec: bvec to return the physical address for
*/
static inline phys_addr_t bvec_phys(const struct bio_vec *bvec)
{
/*
* Note this open codes page_to_phys because page_to_phys is defined in
* <asm/io.h>, which we don't want to pull in here. If it ever moves to
* a sensible place we should start using it.
*/
return PFN_PHYS(page_to_pfn(bvec->bv_page)) + bvec->bv_offset;
}
#endif /* __LINUX_BVEC_H */