[PATCH] io-accounting: write-cancel accounting

[pandora-kernel.git] / fs / buffer.c

diff --git a/fs/buffer.c b/fs/buffer.c
index 904d59d..d1f1b54 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2853,8 +2853,13 @@ int try_to_free_buffers(struct page *page)
                 * could encounter a non-uptodate page, which is unresolvable.
                 * This only applies in the rare case where try_to_free_buffers
                 * succeeds but the page is not freed.
+                *
+                * Also, during truncate, discard_buffer will have marked all
+                * the page's buffers clean.  We discover that here and clean
+                * the page also.
                 */
-               clear_page_dirty(page);
+               if (test_clear_page_dirty(page))
+                       task_io_account_cancelled_write(PAGE_CACHE_SIZE);
        }
 out:
        if (buffers_to_free) {