vfs: add/use account_page_dirtied()

Add a helper function account_page_dirtied().  Use that from two
callsites.  reiser4 adds a function which adds a third callsite.

Signed-off-by: Edward Shishkin<edward.shishkin@gmail.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 15 insertions, 7 deletions

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 40ca7cdb653e..6aa92b03c747 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1198,6 +1198,20 @@ int __set_page_dirty_no_writeback(struct page *page)
 }
 
 /*
+ * Helper function for set_page_dirty family.
+ * NOTE: This relies on being atomic wrt interrupts.
+ */
+void account_page_dirtied(struct page *page, struct address_space *mapping)
+{
+        if (mapping_cap_account_dirty(mapping)) {
+                __inc_zone_page_state(page, NR_FILE_DIRTY);
+                __inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);
+                task_dirty_inc(current);
+                task_io_account_write(PAGE_CACHE_SIZE);
+        }
+}
+
+/*
  * For address_spaces which do not use buffers.  Just tag the page as dirty in
  * its radix tree.
  *
@@ -1226,13 +1240,7 @@ int __set_page_dirty_nobuffers(struct page *page)
                 if (mapping2) { /* Race with truncate? */
                         BUG_ON(mapping2 != mapping);
                         WARN_ON_ONCE(!PagePrivate(page) && !PageUptodate(page));
-                        if (mapping_cap_account_dirty(mapping)) {
-                                __inc_zone_page_state(page, NR_FILE_DIRTY);
-                                __inc_bdi_stat(mapping->backing_dev_info,
-                                                BDI_RECLAIMABLE);
-                                task_dirty_inc(current);
-                                task_io_account_write(PAGE_CACHE_SIZE);
-                        }
+                        account_page_dirtied(page, mapping);
                         radix_tree_tag_set(&mapping->page_tree,
                                 page_index(page), PAGECACHE_TAG_DIRTY);
                 }