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bvec: add a bvec_kmap_local helper
Add a helper to call kmap_local_page on a bvec. There is no need for an unmap helper given that kunmap_local accept any address in the mapped page. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Link: https://lore.kernel.org/r/20210727055646.118787-4-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -7,6 +7,7 @@
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#ifndef __LINUX_BVEC_H
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#define __LINUX_BVEC_H
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#include <linux/highmem.h>
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#include <linux/bug.h>
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#include <linux/errno.h>
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#include <linux/limits.h>
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@ -183,4 +184,16 @@ static inline void bvec_advance(const struct bio_vec *bvec,
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}
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}
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/**
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* bvec_kmap_local - map a bvec into the kernel virtual address space
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* @bvec: bvec to map
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*
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* Must be called on single-page bvecs only. Call kunmap_local on the returned
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* address to unmap.
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*/
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static inline void *bvec_kmap_local(struct bio_vec *bvec)
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{
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return kmap_local_page(bvec->bv_page) + bvec->bv_offset;
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}
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#endif /* __LINUX_BVEC_H */
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