Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/djm/tmem

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/djm/tmem:
  xen: cleancache shim to Xen Transcendent Memory
  ocfs2: add cleancache support
  ext4: add cleancache support
  btrfs: add cleancache support
  ext3: add cleancache support
  mm/fs: add hooks to support cleancache
  mm: cleancache core ops functions and config
  fs: add field to superblock to support cleancache
  mm/fs: cleancache documentation

Fix up trivial conflict in fs/btrfs/extent_io.c due to includes

1 files changed, 11 insertions, 0 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index 68e782b3d3de..7455ccd8bda8 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -34,6 +34,7 @@
 #include <linux/hardirq.h> /* for BUG_ON(!in_atomic()) only */
 #include <linux/memcontrol.h>
 #include <linux/mm_inline.h> /* for page_is_file_cache() */
+#include <linux/cleancache.h>
 #include "internal.h"
 
 /*
@@ -118,6 +119,16 @@ void __delete_from_page_cache(struct page *page)
 {
         struct address_space *mapping = page->mapping;
 
+        /*
+         * if we're uptodate, flush out into the cleancache, otherwise
+         * invalidate any existing cleancache entries.  We can't leave
+         * stale data around in the cleancache once our page is gone
+         */
+        if (PageUptodate(page) && PageMappedToDisk(page))
+                cleancache_put_page(page);
+        else
+                cleancache_flush_page(mapping, page);
+
         radix_tree_delete(&mapping->page_tree, page->index);
         page->mapping = NULL;
         mapping->nrpages--;