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block: Add BIO_PAGE_PINNED and associated infrastructure

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Add BIO_PAGE_PINNED to indicate that the pages in a bio are pinned
(FOLL_PIN) and that the pin will need removing.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: Jens Axboe <axboe@kernel.dk>
cc: Jan Kara <jack@suse.cz>
cc: Matthew Wilcox <willy@infradead.org>
cc: Logan Gunthorpe <logang@deltatee.com>
cc: linux-block@vger.kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230522205744.2825689-5-dhowells@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
David Howells
2023-05-22 21:57:42 +01:00
committed by Jens Axboe
parent e51bab4e20
commit fd363244e8
4 changed files with 18 additions and 4 deletions
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12
block/blk.h
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@@ -420,6 +420,18 @@ int bio_add_hw_page(struct request_queue *q, struct bio *bio,
struct page *page, unsigned int len, unsigned int offset,
unsigned int max_sectors, bool *same_page);
/*
* Clean up a page appropriately, where the page may be pinned, may have a
* ref taken on it or neither.
*/
static inline void bio_release_page(struct bio *bio, struct page *page)
{
if (bio_flagged(bio, BIO_PAGE_PINNED))
unpin_user_page(page);
else if (bio_flagged(bio, BIO_PAGE_REFFED))
put_page(page);
}
struct request_queue *blk_alloc_queue(int node_id);
int disk_scan_partitions(struct gendisk *disk, fmode_t mode);