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>
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@ -1169,7 +1169,7 @@ void __bio_release_pages(struct bio *bio, bool mark_dirty)
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bio_for_each_segment_all(bvec, bio, iter_all) {
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bio_for_each_segment_all(bvec, bio, iter_all) {
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if (mark_dirty && !PageCompound(bvec->bv_page))
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if (mark_dirty && !PageCompound(bvec->bv_page))
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set_page_dirty_lock(bvec->bv_page);
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set_page_dirty_lock(bvec->bv_page);
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put_page(bvec->bv_page);
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bio_release_page(bio, bvec->bv_page);
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}
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}
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}
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}
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EXPORT_SYMBOL_GPL(__bio_release_pages);
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EXPORT_SYMBOL_GPL(__bio_release_pages);
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@ -1489,8 +1489,8 @@ void bio_set_pages_dirty(struct bio *bio)
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* the BIO and re-dirty the pages in process context.
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* the BIO and re-dirty the pages in process context.
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*
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*
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* It is expected that bio_check_pages_dirty() will wholly own the BIO from
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* It is expected that bio_check_pages_dirty() will wholly own the BIO from
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* here on. It will run one put_page() against each page and will run one
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* here on. It will unpin each page and will run one bio_put() against the
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* bio_put() against the BIO.
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* BIO.
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*/
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*/
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static void bio_dirty_fn(struct work_struct *work);
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static void bio_dirty_fn(struct work_struct *work);
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12
block/blk.h
12
block/blk.h
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@ -420,6 +420,18 @@ int bio_add_hw_page(struct request_queue *q, struct bio *bio,
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struct page *page, unsigned int len, unsigned int offset,
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struct page *page, unsigned int len, unsigned int offset,
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unsigned int max_sectors, bool *same_page);
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unsigned int max_sectors, bool *same_page);
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/*
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* Clean up a page appropriately, where the page may be pinned, may have a
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* ref taken on it or neither.
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*/
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static inline void bio_release_page(struct bio *bio, struct page *page)
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{
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if (bio_flagged(bio, BIO_PAGE_PINNED))
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unpin_user_page(page);
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else if (bio_flagged(bio, BIO_PAGE_REFFED))
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put_page(page);
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}
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struct request_queue *blk_alloc_queue(int node_id);
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struct request_queue *blk_alloc_queue(int node_id);
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int disk_scan_partitions(struct gendisk *disk, fmode_t mode);
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int disk_scan_partitions(struct gendisk *disk, fmode_t mode);
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@ -488,7 +488,8 @@ void zero_fill_bio(struct bio *bio);
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static inline void bio_release_pages(struct bio *bio, bool mark_dirty)
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static inline void bio_release_pages(struct bio *bio, bool mark_dirty)
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{
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{
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if (bio_flagged(bio, BIO_PAGE_REFFED))
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if (bio_flagged(bio, BIO_PAGE_REFFED) ||
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bio_flagged(bio, BIO_PAGE_PINNED))
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__bio_release_pages(bio, mark_dirty);
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__bio_release_pages(bio, mark_dirty);
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}
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}
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@ -323,6 +323,7 @@ struct bio {
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* bio flags
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* bio flags
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*/
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*/
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enum {
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enum {
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BIO_PAGE_PINNED, /* Unpin pages in bio_release_pages() */
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BIO_PAGE_REFFED, /* put pages in bio_release_pages() */
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BIO_PAGE_REFFED, /* put pages in bio_release_pages() */
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BIO_CLONED, /* doesn't own data */
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BIO_CLONED, /* doesn't own data */
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BIO_BOUNCED, /* bio is a bounce bio */
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BIO_BOUNCED, /* bio is a bounce bio */
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