linux-kernel - [PATCH 3/8] writeback: use WRITE_SYNC for reclaim or sync writeback

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Message-ID: <1458746750-9213-4-git-send-email-axboe@fb.com>
Date:	Wed, 23 Mar 2016 09:25:45 -0600
From:	Jens Axboe <axboe@...com>
To:	<linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	<linux-block@...r.kernel.org>
CC:	Jens Axboe <axboe@...com>
Subject: [PATCH 3/8] writeback: use WRITE_SYNC for reclaim or sync writeback

If we're doing reclaim or sync IO, use WRITE_SYNC to inform the lower
levels of the importance of this IO.

Signed-off-by: Jens Axboe <axboe@...com>
---
 include/linux/writeback.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 719c255e105a..b2c75b8901da 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -102,7 +102,7 @@ struct writeback_control {
 
 static inline int wbc_to_write(struct writeback_control *wbc)
 {
-	if (wbc->sync_mode == WB_SYNC_ALL)
+	if (wbc->sync_mode == WB_SYNC_ALL || wbc->for_reclaim || wbc->for_sync)
 		return WRITE_SYNC;
 
 	return WRITE;
-- 
2.4.1.168.g1ea28e1