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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>
This commit is contained in:
Christoph Hellwig 2021-07-27 07:56:34 +02:00 committed by Jens Axboe
parent e45cef51db
commit e6e7471706
1 changed files with 13 additions and 0 deletions
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13
include/linux/bvec.h
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@ -7,6 +7,7 @@
#ifndef __LINUX_BVEC_H
#define __LINUX_BVEC_H
#include <linux/highmem.h>
#include <linux/bug.h>
#include <linux/errno.h>
#include <linux/limits.h>
@ -183,4 +184,16 @@ static inline void bvec_advance(const struct bio_vec *bvec,
}
}
/**
* bvec_kmap_local - map a bvec into the kernel virtual address space
* @bvec: bvec to map
*
* Must be called on single-page bvecs only. Call kunmap_local on the returned
* address to unmap.
*/
static inline void *bvec_kmap_local(struct bio_vec *bvec)
{
return kmap_local_page(bvec->bv_page) + bvec->bv_offset;
}
#endif /* __LINUX_BVEC_H */