linux-kernel - [PATCH] block-dev: enable writeback cgroup support

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Date:	Mon, 1 Feb 2016 17:50:33 -0800
From:	Shaohua Li <shli@...com>
To:	<linux-kernel@...r.kernel.org>
CC:	<axboe@...nel.dk>, <tj@...nel.org>, <Kernel-team@...com>
Subject: [PATCH] block-dev: enable writeback cgroup support

block_dev's .writepages/.writepage already handles
wbc_init_bio/wbc_account_io. We only set the SB_I_CGROUPWB bit to
suppport writeback cgroup support.

Signed-off-by: Shaohua Li <shli@...com>
---
 fs/block_dev.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 7b9cd49..548ded7 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -575,7 +575,11 @@ static const struct super_operations bdev_sops = {
 static struct dentry *bd_mount(struct file_system_type *fs_type,
 	int flags, const char *dev_name, void *data)
 {
-	return mount_pseudo(fs_type, "bdev:", &bdev_sops, NULL, BDEVFS_MAGIC);
+	struct dentry *dent;
+	dent = mount_pseudo(fs_type, "bdev:", &bdev_sops, NULL, BDEVFS_MAGIC);
+	if (dent)
+		dent->d_sb->s_iflags |= SB_I_CGROUPWB;
+	return dent;
 }
 
 static struct file_system_type bd_type = {
-- 
2.4.6