linux-kernel - [PATCH] page_writeback: put account_page_redirty() after set_page

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Message-ID: <20150115155238.31251.41331.stgit@buzz>
Date:	Thu, 15 Jan 2015 18:52:38 +0300
From:	Konstantin Khebnikov <khlebnikov@...dex-team.ru>
To:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	koct9i@...il.com
Subject: [PATCH] page_writeback: put account_page_redirty() after
 set_page_dirty()

Helper account_page_redirty() fixes dirty pages counter for redirtied pages.
This patch puts it after dirtying and prevents temporary underflows of
dirtied pages counters on zone/bdi and current->nr_dirtied.

Signed-off-by: Konstantin Khebnikov <khlebnikov@...dex-team.ru>
---
 fs/btrfs/extent_io.c |    2 +-
 mm/page-writeback.c  |    5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 4ebabd2..281bc7e 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1407,8 +1407,8 @@ int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end)
 	while (index <= end_index) {
 		page = find_get_page(inode->i_mapping, index);
 		BUG_ON(!page); /* Pages should be in the extent_io_tree */
-		account_page_redirty(page);
 		__set_page_dirty_nobuffers(page);
+		account_page_redirty(page);
 		page_cache_release(page);
 		index++;
 	}
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 6f43352..4da3cd5 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2168,9 +2168,12 @@ EXPORT_SYMBOL(account_page_redirty);
  */
 int redirty_page_for_writepage(struct writeback_control *wbc, struct page *page)
 {
+	int ret;
+
 	wbc->pages_skipped++;
+	ret = __set_page_dirty_nobuffers(page);
 	account_page_redirty(page);
-	return __set_page_dirty_nobuffers(page);
+	return ret;
 }
 EXPORT_SYMBOL(redirty_page_for_writepage);
 

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