The patch titled Subject: mm: make mapping_evict_folio() the preferred way to evict clean folios has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-make-mapping_evict_folio-the-preferred-way-to-evict-clean-folios.patch
This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...
This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------ From: "Matthew Wilcox (Oracle)" willy@infradead.org Subject: mm: make mapping_evict_folio() the preferred way to evict clean folios Date: Wed, 8 Nov 2023 18:28:04 +0000
Patch series "Fix fault handler's handling of poisoned tail pages".
Since introducing the ability to have large folios in the page cache, it's been possible to have a hwpoisoned tail page returned from the fault handler. We handle this situation poorly; failing to remove the affected page from use.
This isn't a minimal patch to fix it, it's a full conversion of all the code surrounding it.
This patch (of 6):
invalidate_inode_page() does very little beyond calling mapping_evict_folio(). Move the check for mapping being NULL into mapping_evict_folio() and make it available to the rest of the MM for use in the next few patches.
Link: https://lkml.kernel.org/r/20231108182809.602073-1-willy@infradead.org Link: https://lkml.kernel.org/r/20231108182809.602073-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) willy@infradead.org Cc: Naoya Horiguchi naoya.horiguchi@nec.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
mm/internal.h | 1 + mm/truncate.c | 33 ++++++++++++++++----------------- 2 files changed, 17 insertions(+), 17 deletions(-)
--- a/mm/internal.h~mm-make-mapping_evict_folio-the-preferred-way-to-evict-clean-folios +++ a/mm/internal.h @@ -138,6 +138,7 @@ void filemap_free_folio(struct address_s int truncate_inode_folio(struct address_space *mapping, struct folio *folio); bool truncate_inode_partial_folio(struct folio *folio, loff_t start, loff_t end); +long mapping_evict_folio(struct address_space *mapping, struct folio *folio); long invalidate_inode_page(struct page *page); unsigned long mapping_try_invalidate(struct address_space *mapping, pgoff_t start, pgoff_t end, unsigned long *nr_failed); --- a/mm/truncate.c~mm-make-mapping_evict_folio-the-preferred-way-to-evict-clean-folios +++ a/mm/truncate.c @@ -266,9 +266,22 @@ int generic_error_remove_page(struct add } EXPORT_SYMBOL(generic_error_remove_page);
-static long mapping_evict_folio(struct address_space *mapping, - struct folio *folio) +/** + * mapping_evict_folio() - Remove an unused folio from the page-cache. + * @mapping: The mapping this folio belongs to. + * @folio: The folio to remove. + * + * Safely remove one folio from the page cache. + * It only drops clean, unused folios. + * + * Context: Folio must be locked. + * Return: The number of pages successfully removed. + */ +long mapping_evict_folio(struct address_space *mapping, struct folio *folio) { + /* The page may have been truncated before it was locked */ + if (!mapping) + return 0; if (folio_test_dirty(folio) || folio_test_writeback(folio)) return 0; /* The refcount will be elevated if any page in the folio is mapped */ @@ -281,25 +294,11 @@ static long mapping_evict_folio(struct a return remove_mapping(mapping, folio); }
-/** - * invalidate_inode_page() - Remove an unused page from the pagecache. - * @page: The page to remove. - * - * Safely invalidate one page from its pagecache mapping. - * It only drops clean, unused pages. - * - * Context: Page must be locked. - * Return: The number of pages successfully removed. - */ long invalidate_inode_page(struct page *page) { struct folio *folio = page_folio(page); - struct address_space *mapping = folio_mapping(folio);
- /* The page may have been truncated before it was locked */ - if (!mapping) - return 0; - return mapping_evict_folio(mapping, folio); + return mapping_evict_folio(folio_mapping(folio), folio); }
/** _
Patches currently in -mm which might be from willy@infradead.org are
mm-make-mapping_evict_folio-the-preferred-way-to-evict-clean-folios.patch mm-convert-__do_fault-to-use-a-folio.patch mm-use-mapping_evict_folio-in-truncate_error_page.patch mm-convert-soft_offline_in_use_page-to-use-a-folio.patch mm-convert-isolate_page-to-mf_isolate_folio.patch mm-remove-invalidate_inode_page.patch