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mm: release number of pages of a folio

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Add a new function unpin_user_folio() to put the refs of a folio by
npages count.

The check for BIO_PAGE_PINNED flag is removed as it is already checked
in bio_release_pages().

Signed-off-by: Kundan Kumar <kundan.kumar@samsung.com>
Tested-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20240911064935.5630-4-kundan.kumar@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kundan Kumar 2024-09-11 12:19:34 +05:30 committed by Jens Axboe
parent ed9832bc08
commit d3bfbfb124
2 changed files with 14 additions and 0 deletions
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1
include/linux/mm.h
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@ -1597,6 +1597,7 @@ void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages,
void unpin_user_page_range_dirty_lock(struct page *page, unsigned long npages,
bool make_dirty);
void unpin_user_pages(struct page **pages, unsigned long npages);
void unpin_user_folio(struct folio *folio, unsigned long npages);
void unpin_folios(struct folio **folios, unsigned long nfolios);
static inline bool is_cow_mapping(vm_flags_t flags)

13
mm/gup.c
View File

@ -415,6 +415,19 @@ void unpin_user_pages(struct page **pages, unsigned long npages)
}
EXPORT_SYMBOL(unpin_user_pages);
/**
* unpin_user_folio() - release pages of a folio
* @folio: pointer to folio to be released
* @npages: number of pages of same folio
*
* Release npages of the folio
*/
void unpin_user_folio(struct folio *folio, unsigned long npages)
{
gup_put_folio(folio, npages, FOLL_PIN);
}
EXPORT_SYMBOL(unpin_user_folio);
/**
* unpin_folios() - release an array of gup-pinned folios.
* @folios: array of folios to be marked dirty and released.