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authorMatthew Wilcox (Oracle) <willy@infradead.org>2021-05-14 15:04:28 -0400
committerMatthew Wilcox (Oracle) <willy@infradead.org>2021-10-18 07:49:40 -0400
commit3eed3ef55c83ec718fae676fd59699816223215f (patch)
tree68dc5ce7200238eaf9ee99b87626d5bfa5e103d7 /mm/internal.h
parent0995d7e568141226f10f8216aa4965e06ab5db8a (diff)
mm: Add folio_evictable()
This is the folio equivalent of page_evictable(). Unfortunately, it's different from !folio_test_unevictable(), but I think it's used in places where you have to be a VM expert and can reasonably be expected to know the difference. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Vlastimil Babka <vbabka@suse.cz>
Diffstat (limited to 'mm/internal.h')
-rw-r--r--mm/internal.h27
1 files changed, 19 insertions, 8 deletions
diff --git a/mm/internal.h b/mm/internal.h
index 08fb03b16d3d..b1001ebeb286 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -72,17 +72,28 @@ unsigned find_lock_entries(struct address_space *mapping, pgoff_t start,
pgoff_t end, struct pagevec *pvec, pgoff_t *indices);
/**
- * page_evictable - test whether a page is evictable
- * @page: the page to test
+ * folio_evictable - Test whether a folio is evictable.
+ * @folio: The folio to test.
*
- * Test whether page is evictable--i.e., should be placed on active/inactive
- * lists vs unevictable list.
- *
- * Reasons page might not be evictable:
- * (1) page's mapping marked unevictable
- * (2) page is part of an mlocked VMA
+ * Test whether @folio is evictable -- i.e., should be placed on
+ * active/inactive lists vs unevictable list.
*
+ * Reasons folio might not be evictable:
+ * 1. folio's mapping marked unevictable
+ * 2. One of the pages in the folio is part of an mlocked VMA
*/
+static inline bool folio_evictable(struct folio *folio)
+{
+ bool ret;
+
+ /* Prevent address_space of inode and swap cache from being freed */
+ rcu_read_lock();
+ ret = !mapping_unevictable(folio_mapping(folio)) &&
+ !folio_test_mlocked(folio);
+ rcu_read_unlock();
+ return ret;
+}
+
static inline bool page_evictable(struct page *page)
{
bool ret;