diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mm.h | 1 | ||||
| -rw-r--r-- | include/linux/pagemap.h | 10 |
2 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 21115933b9b8..2e5c207e702c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1629,7 +1629,6 @@ static inline pgoff_t page_index(struct page *page) bool page_mapped(struct page *page); struct address_space *page_mapping(struct page *page); -struct address_space *page_mapping_file(struct page *page); /* * Return true only if the page has been allocated with diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 4686f9ab0636..469fa7ffcf96 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -158,6 +158,16 @@ static inline void filemap_nr_thps_dec(struct address_space *mapping) void release_pages(struct page **pages, int nr); /* + * For file cache pages, return the address_space, otherwise return NULL + */ +static inline struct address_space *page_mapping_file(struct page *page) +{ + if (unlikely(PageSwapCache(page))) + return NULL; + return page_mapping(page); +} + +/* * speculatively take a reference to a page. * If the page is free (_refcount == 0), then _refcount is untouched, and 0 * is returned. Otherwise, _refcount is incremented by 1 and 1 is returned. |