linux-kernel - [PATCH 14/16] writeback: cosmetic change in account_page

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Date:	Tue,  6 Jan 2015 14:29:15 -0500
From:	Tejun Heo <tj@...nel.org>
To:	axboe@...nel.dk
Cc:	linux-kernel@...r.kernel.org, jack@...e.cz, hch@...radead.org,
	hannes@...xchg.org, linux-fsdevel@...r.kernel.org,
	vgoyal@...hat.com, lizefan@...wei.com, cgroups@...r.kernel.org,
	linux-mm@...ck.org, mhocko@...e.cz, Tejun Heo <tj@...nel.org>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: [PATCH 14/16] 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 026c91b..d73539f 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2094,15 +2094,16 @@ 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);
 
-- 
2.1.0

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