[PATCH] read_mapping_page for address space

Add read_mapping_page() which is used for callers that pass
mapping->a_ops->readpage as the filler for read_cache_page.  This removes
some duplication from filesystem code.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 7a1af574dedf..1245df7141aa 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -99,6 +99,13 @@ extern struct page * read_cache_page(struct address_space *mapping,
 extern int read_cache_pages(struct address_space *mapping,
                 struct list_head *pages, filler_t *filler, void *data);
 
+static inline struct page *read_mapping_page(struct address_space *mapping,
+                                             unsigned long index, void *data)
+{
+        filler_t *filler = (filler_t *)mapping->a_ops->readpage;
+        return read_cache_page(mapping, index, filler, data);
+}
+
 int add_to_page_cache(struct page *page, struct address_space *mapping,
                                 unsigned long index, gfp_t gfp_mask);
 int add_to_page_cache_lru(struct page *page, struct address_space *mapping,