4.4-stable patches

[thirdparty/kernel/stable-queue.git] / queue-4.4 / writeback-initialize-inode-members-that-track-writeb.patch

From 7ad1b3cfd1989edaa716a4bf979a5396a77a5a15 Mon Sep 17 00:00:00 2001
From: Tahsin Erdogan <tahsin@google.com>
Date: Tue, 16 Feb 2016 13:34:39 -0800
Subject: writeback: initialize inode members that track writeback history

[ Upstream commit 3d65ae4634ed8350aee98a4e6f4e41fe40c7d282 ]

inode struct members that track cgroup writeback information
should be reinitialized when inode gets allocated from
kmem_cache. Otherwise, their values remain and get used by the
new inode.

Signed-off-by: Tahsin Erdogan <tahsin@google.com>
Acked-by: Tejun Heo <tj@kernel.org>
Fixes: d10c80955265 ("writeback: implement foreign cgroup inode bdi_writeback switching")
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/inode.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/inode.c b/fs/inode.c
index a39c2724d8a0..b5c3a6473aaa 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -154,6 +154,12 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
 	inode->i_rdev = 0;
 	inode->dirtied_when = 0;
 
+#ifdef CONFIG_CGROUP_WRITEBACK
+	inode->i_wb_frn_winner = 0;
+	inode->i_wb_frn_avg_time = 0;
+	inode->i_wb_frn_history = 0;
+#endif
+
 	if (security_inode_alloc(inode))
 		goto out;
 	spin_lock_init(&inode->i_lock);
-- 
2.19.1