- if (!TestSetPageDirty(page)) {
- write_lock_irq(&mapping->tree_lock);
- if (page->mapping) { /* Race with truncate? */
- if (mapping_cap_account_dirty(mapping))
- __inc_zone_page_state(page, NR_FILE_DIRTY);
- radix_tree_tag_set(&mapping->page_tree,
- page_index(page),
- PAGECACHE_TAG_DIRTY);
+ if (TestSetPageDirty(page))
+ return 0;
+
+ write_lock_irq(&mapping->tree_lock);
+ if (page->mapping) { /* Race with truncate? */
+ if (mapping_cap_account_dirty(mapping)) {
+ __inc_zone_page_state(page, NR_FILE_DIRTY);
+ task_io_account_write(PAGE_CACHE_SIZE);