linux-kernel - [PATCH 08/10] writeback: cosmetic change in account_page

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Message-Id: <1416299848-22112-9-git-send-email-tj@kernel.org>
Date:	Tue, 18 Nov 2014 03:37:26 -0500
From:	Tejun Heo <tj@...nel.org>
To:	axboe@...nel.dk
Cc:	linux-kernel@...r.kernel.org, jack@...e.cz,
	Tejun Heo <tj@...nel.org>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: [PATCH 08/10] writeback: cosmetic change in account_page_dirtied()

Flip the polarity of mapping_cap_account_dirty() test so that the body
of page accounting can be moved outside the if () block.  This will
help adding cgroup writeback support.

This causes no logic changes.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: Jan Kara <jack@...e.cz>
Cc: Wu Fengguang <fengguang.wu@...el.com>
---
 mm/page-writeback.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 7c721b4..29d5bd2 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2104,15 +2104,16 @@ void account_page_dirtied(struct page *page, struct address_space *mapping)
 {
 	trace_writeback_dirty_page(page, mapping);
 
-	if (mapping_cap_account_dirty(mapping)) {
-		__inc_zone_page_state(page, NR_FILE_DIRTY);
-		__inc_zone_page_state(page, NR_DIRTIED);
-		__inc_wb_stat(&mapping->backing_dev_info->wb, WB_RECLAIMABLE);
-		__inc_wb_stat(&mapping->backing_dev_info->wb, WB_DIRTIED);
-		task_io_account_write(PAGE_CACHE_SIZE);
-		current->nr_dirtied++;
-		this_cpu_inc(bdp_ratelimits);
-	}
+	if (!mapping_cap_account_dirty(mapping))
+		return;
+
+	__inc_zone_page_state(page, NR_FILE_DIRTY);
+	__inc_zone_page_state(page, NR_DIRTIED);
+	__inc_wb_stat(&mapping->backing_dev_info->wb, WB_RECLAIMABLE);
+	__inc_wb_stat(&mapping->backing_dev_info->wb, WB_DIRTIED);
+	task_io_account_write(PAGE_CACHE_SIZE);
+	current->nr_dirtied++;
+	this_cpu_inc(bdp_ratelimits);
 }
 EXPORT_SYMBOL(account_page_dirtied);
 
-- 
1.9.3

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