Commit 850e210d authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

block: add a bio_add_virt_nofail helper 



Add a helper to add a directly mapped kernel virtual address to a
bio so that callers don't have to convert to pages or folios.

For now only the _nofail variant is provided as that is what all the
obvious callers want.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarDamien Le Moal <dlemoal@kernel.org>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Reviewed-by: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20250507120451.4000627-2-hch@lst.de


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent f31acff0

block/bio.c

+16 −0
Original line number Diff line number Diff line
@@ -991,6 +991,22 @@ void __bio_add_page(struct bio *bio, struct page *page, 
}

EXPORT_SYMBOL_GPL(__bio_add_page);



/**

 * bio_add_virt_nofail - add data in the direct kernel mapping to a bio

 * @bio: destination bio

 * @vaddr: data to add

 * @len: length of the data to add, may cross pages

 *

 * Add the data at @vaddr to @bio.  The caller must have ensure a segment

 * is available for the added data.  No merging into an existing segment

 * will be performed.

 */

void bio_add_virt_nofail(struct bio *bio, void *vaddr, unsigned len)

{

	__bio_add_page(bio, virt_to_page(vaddr), len, offset_in_page(vaddr));

}

EXPORT_SYMBOL_GPL(bio_add_virt_nofail);



/**

 *	bio_add_page	-	attempt to add page(s) to bio

 *	@bio: destination bio

include/linux/bio.h

+2 −0
Original line number Diff line number Diff line
@@ -417,6 +417,8 @@ void __bio_add_page(struct bio *bio, struct page *page, 
		unsigned int len, unsigned int off);

void bio_add_folio_nofail(struct bio *bio, struct folio *folio, size_t len,

			  size_t off);

void bio_add_virt_nofail(struct bio *bio, void *vaddr, unsigned len);



int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter);

void bio_iov_bvec_set(struct bio *bio, const struct iov_iter *iter);

void __bio_release_pages(struct bio *bio, bool mark_dirty);