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-rw-r--r--mm/page-writeback.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 644bcb665773..0372411f38fc 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2111,6 +2111,25 @@ void account_page_dirtied(struct page *page, struct address_space *mapping)
EXPORT_SYMBOL(account_page_dirtied);
/*
+ * Helper function for deaccounting dirty page without writeback.
+ *
+ * Doing this should *normally* only ever be done when a page
+ * is truncated, and is not actually mapped anywhere at all. However,
+ * fs/buffer.c does this when it notices that somebody has cleaned
+ * out all the buffers on a page without actually doing it through
+ * the VM. Can you say "ext3 is horribly ugly"? Thought you could.
+ */
+void account_page_cleaned(struct page *page, struct address_space *mapping)
+{
+ if (mapping_cap_account_dirty(mapping)) {
+ dec_zone_page_state(page, NR_FILE_DIRTY);
+ dec_bdi_stat(inode_to_bdi(mapping->host), BDI_RECLAIMABLE);
+ task_io_account_cancelled_write(PAGE_CACHE_SIZE);
+ }
+}
+EXPORT_SYMBOL(account_page_cleaned);
+
+/*
* For address_spaces which do not use buffers. Just tag the page as dirty in
* its radix tree.
*