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-rw-r--r--mm/truncate.c37
1 files changed, 7 insertions, 30 deletions
diff --git a/mm/truncate.c b/mm/truncate.c
index ddec5a5966d7..7a9d8a3cb143 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -93,35 +93,6 @@ void do_invalidatepage(struct page *page, unsigned int offset,
}
/*
- * This cancels just the dirty bit on the kernel page itself, it
- * does NOT actually remove dirty bits on any mmap's that may be
- * around. It also leaves the page tagged dirty, so any sync
- * activity will still find it on the dirty lists, and in particular,
- * clear_page_dirty_for_io() will still look at the dirty bits in
- * the VM.
- *
- * 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"? Tought you could.
- */
-void cancel_dirty_page(struct page *page, unsigned int account_size)
-{
- if (TestClearPageDirty(page)) {
- struct address_space *mapping = page->mapping;
- if (mapping && mapping_cap_account_dirty(mapping)) {
- dec_zone_page_state(page, NR_FILE_DIRTY);
- dec_bdi_stat(inode_to_bdi(mapping->host),
- BDI_RECLAIMABLE);
- if (account_size)
- task_io_account_cancelled_write(account_size);
- }
- }
-}
-EXPORT_SYMBOL(cancel_dirty_page);
-
-/*
* If truncate cannot remove the fs-private metadata from the page, the page
* becomes orphaned. It will be left on the LRU and may even be mapped into
* user pagetables if we're racing with filemap_fault().
@@ -140,7 +111,13 @@ truncate_complete_page(struct address_space *mapping, struct page *page)
if (page_has_private(page))
do_invalidatepage(page, 0, PAGE_CACHE_SIZE);
- cancel_dirty_page(page, PAGE_CACHE_SIZE);
+ /*
+ * Some filesystems seem to re-dirty the page even after
+ * the VM has canceled the dirty bit (eg ext3 journaling).
+ * Hence dirty accounting check is placed after invalidation.
+ */
+ if (TestClearPageDirty(page))
+ account_page_cleaned(page, mapping);
ClearPageMappedToDisk(page);
delete_from_page_cache(page);