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filemap: Add filemap_release_folio()

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Reimplement try_to_release_page() as a wrapper around
filemap_release_folio().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-07-28 15:14:48 -04:00
parent 960ea971fa
commit 82c50f8b44
4 changed files with 27 additions and 21 deletions
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1
include/linux/mm.h
View File

@ -1970,7 +1970,6 @@ int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
struct page **pages);
struct page *get_dump_page(unsigned long addr);
extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
extern void do_invalidatepage(struct page *page, unsigned int offset,
unsigned int length);

2
include/linux/pagemap.h
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@ -939,6 +939,8 @@ static inline void __delete_from_page_cache(struct page *page, void *shadow)
void replace_page_cache_page(struct page *old, struct page *new);
void delete_from_page_cache_batch(struct address_space *mapping,
struct pagevec *pvec);
int try_to_release_page(struct page *page, gfp_t gfp);
bool filemap_release_folio(struct folio *folio, gfp_t gfp);
loff_t mapping_seek_hole_data(struct address_space *, loff_t start, loff_t end,
int whence);

39
mm/filemap.c
View File

@ -3889,33 +3889,32 @@ ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
EXPORT_SYMBOL(generic_file_write_iter);
/**
* try_to_release_page() - release old fs-specific metadata on a page
* filemap_release_folio() - Release fs-specific metadata on a folio.
* @folio: The folio which the kernel is trying to free.
* @gfp: Memory allocation flags (and I/O mode).
*
* @page: the page which the kernel is trying to free
* @gfp_mask: memory allocation flags (and I/O mode)
* The address_space is trying to release any data attached to a folio
* (presumably at folio->private).
*
* The address_space is to try to release any data against the page
* (presumably at page->private).
* This will also be called if the private_2 flag is set on a page,
* indicating that the folio has other metadata associated with it.
*
* This may also be called if PG_fscache is set on a page, indicating that the
* page is known to the local caching routines.
* The @gfp argument specifies whether I/O may be performed to release
* this page (__GFP_IO), and whether the call may block
* (__GFP_RECLAIM & __GFP_FS).
*
* The @gfp_mask argument specifies whether I/O may be performed to release
* this page (__GFP_IO), and whether the call may block (__GFP_RECLAIM & __GFP_FS).
*
* Return: %1 if the release was successful, otherwise return zero.
* Return: %true if the release was successful, otherwise %false.
*/
int try_to_release_page(struct page *page, gfp_t gfp_mask)
bool filemap_release_folio(struct folio *folio, gfp_t gfp)
{
struct address_space * const mapping = page->mapping;
struct address_space * const mapping = folio->mapping;
BUG_ON(!PageLocked(page));
if (PageWriteback(page))
return 0;
BUG_ON(!folio_test_locked(folio));
if (folio_test_writeback(folio))
return false;
if (mapping && mapping->a_ops->releasepage)
return mapping->a_ops->releasepage(page, gfp_mask);
return try_to_free_buffers(page);
return mapping->a_ops->releasepage(&folio->page, gfp);
return try_to_free_buffers(&folio->page);
}
EXPORT_SYMBOL(try_to_release_page);
EXPORT_SYMBOL(filemap_release_folio);

6
mm/folio-compat.c
View File

@ -145,3 +145,9 @@ void delete_from_page_cache(struct page *page)
{
return filemap_remove_folio(page_folio(page));
}
int try_to_release_page(struct page *page, gfp_t gfp)
{
return filemap_release_folio(page_folio(page), gfp);
}
EXPORT_SYMBOL(try_to_release_page);