linux-kernel - [PATCH 01/10] cgroup: move cgroup_clear_directory() call out of cgroup_populate

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Date:	Fri, 16 Mar 2012 16:35:54 -0700
From:	Tejun Heo <tj@...nel.org>
To:	glommer@...allels.com, lizf@...fujitsu.com,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, fweisbec@...il.com, rni@...gle.com,
	ctalbott@...gle.com, Tejun Heo <tj@...nel.org>
Subject: [PATCH 01/10] cgroup: move cgroup_clear_directory() call out of cgroup_populate_dir()

cgroup_populate_dir() currently clears all files and then repopulate
the directory; however, the clearing part is only useful when it's
called from cgroup_remount().  Relocate the invocation to
cgroup_remount().

This is to prepare for further cgroup file handling updates.

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 kernel/cgroup.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index deeab87..2e2f93b 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1313,7 +1313,8 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
 		goto out_unlock;
 	}
 
-	/* (re)populate subsystem files */
+	/* clear out any existing files and repopulate subsystem files */
+	cgroup_clear_directory(cgrp->dentry);
 	cgroup_populate_dir(cgrp);
 
 	if (opts.release_agent)
@@ -3648,9 +3649,6 @@ static int cgroup_populate_dir(struct cgroup *cgrp)
 	int err;
 	struct cgroup_subsys *ss;
 
-	/* First clear out any existing files */
-	cgroup_clear_directory(cgrp->dentry);
-
 	err = cgroup_add_files(cgrp, NULL, files, ARRAY_SIZE(files));
 	if (err < 0)
 		return err;
-- 
1.7.7.3

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