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block: Add BIO_PAGE_PINNED and associated infrastructure 

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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6
block/bio.c
View File

@ -1169,7 +1169,7 @@ void __bio_release_pages(struct bio *bio, bool mark_dirty)
bio_for_each_segment_all(bvec, bio, iter_all) {
if (mark_dirty && !PageCompound(bvec->bv_page))
set_page_dirty_lock(bvec->bv_page);
put_page(bvec->bv_page);
bio_release_page(bio, bvec->bv_page);
}
}
EXPORT_SYMBOL_GPL(__bio_release_pages);
@ -1489,8 +1489,8 @@ void bio_set_pages_dirty(struct bio *bio)
* the BIO and re-dirty the pages in process context.
*
* It is expected that bio_check_pages_dirty() will wholly own the BIO from
* here on. It will run one put_page() against each page and will run one
* bio_put() against the BIO.
* here on. It will unpin each page and will run one bio_put() against the
* BIO.
*/
static void bio_dirty_fn(struct work_struct *work);

12
block/blk.h
View File

@ -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);

3
include/linux/bio.h
View File

@ -488,7 +488,8 @@ void zero_fill_bio(struct bio *bio);
static inline void bio_release_pages(struct bio *bio, bool mark_dirty)
{
if (bio_flagged(bio, BIO_PAGE_REFFED))
if (bio_flagged(bio, BIO_PAGE_REFFED) ||
bio_flagged(bio, BIO_PAGE_PINNED))
__bio_release_pages(bio, mark_dirty);
}

1
include/linux/blk_types.h
View File

@ -323,6 +323,7 @@ struct bio {
* bio flags
*/
enum {
BIO_PAGE_PINNED, /* Unpin pages in bio_release_pages() */
BIO_PAGE_REFFED, /* put pages in bio_release_pages() */
BIO_CLONED, /* doesn't own data */
BIO_BOUNCED, /* bio is a bounce bio */