From: Andrew Morton <[email protected]>
Account for the number of byte writes which this process caused to not happen
after all.
Cc: Jay Lan <[email protected]>
Cc: Shailabh Nagar <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Chris Sturtivant <[email protected]>
Cc: Tony Ernst <[email protected]>
Cc: Guillaume Thouvenin <[email protected]>
Cc: David Wright <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
fs/buffer.c | 7 ++++++-
mm/truncate.c | 4 +++-
2 files changed, 9 insertions(+), 2 deletions(-)
diff -puN fs/buffer.c~io-accounting-write-cancel-accounting fs/buffer.c
--- a/fs/buffer.c~io-accounting-write-cancel-accounting
+++ a/fs/buffer.c
@@ -2823,8 +2823,13 @@ int try_to_free_buffers(struct page *pag
* 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) {
diff -puN mm/truncate.c~io-accounting-write-cancel-accounting mm/truncate.c
--- a/mm/truncate.c~io-accounting-write-cancel-accounting
+++ a/mm/truncate.c
@@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/pagevec.h>
+#include <linux/task_io_accounting_ops.h>
#include <linux/buffer_head.h> /* grr. try_to_release_page,
do_invalidatepage */
@@ -69,7 +70,8 @@ truncate_complete_page(struct address_sp
if (PagePrivate(page))
do_invalidatepage(page, 0);
- clear_page_dirty(page);
+ if (test_clear_page_dirty(page))
+ task_io_account_cancelled_write(PAGE_CACHE_SIZE);
ClearPageUptodate(page);
ClearPageMappedToDisk(page);
remove_from_page_cache(page);
_
-
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