Commit e6e74717 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

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: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: default avatarIra Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20210727055646.118787-4-hch@lst.de


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent e45cef51

include/linux/bvec.h

+13 −0
Original line number Diff line number Diff line
@@ -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 */