linux-kernel - [ 072/123] cgroup_rm_file: dont delete the uncreated files

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Message-Id: <20130109201507.859215171@linuxfoundation.org>
Date:	Wed,  9 Jan 2013 12:35:11 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Gao feng <gaofeng@...fujitsu.com>,
	Li Zefan <lizefan@...wei.com>, Tejun Heo <tj@...hat.com>
Subject: [ 072/123] cgroup_rm_file: dont delete the uncreated files

3.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gao feng <gaofeng@...fujitsu.com>

commit f33fddc2b9573d8359f1007d4bbe5cd587a0c093 upstream.

in cgroup_add_file,when creating files for cgroup,
some of creation may be skipped. So we need to avoid
deleting these uncreated files in cgroup_rm_file,
otherwise the warning msg will be triggered.

"cgroup_addrm_files: failed to remove memory_pressure_enabled, err=-2"

Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
Acked-by: Li Zefan <lizefan@...wei.com>
Signed-off-by: Tejun Heo <tj@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/cgroup.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2789,12 +2789,6 @@ static int cgroup_add_file(struct cgroup
 
 	simple_xattrs_init(&cft->xattrs);
 
-	/* does @cft->flags tell us to skip creation on @cgrp? */
-	if ((cft->flags & CFTYPE_NOT_ON_ROOT) && !cgrp->parent)
-		return 0;
-	if ((cft->flags & CFTYPE_ONLY_ON_ROOT) && cgrp->parent)
-		return 0;
-
 	if (subsys && !test_bit(ROOT_NOPREFIX, &cgrp->root->flags)) {
 		strcpy(name, subsys->name);
 		strcat(name, ".");
@@ -2835,6 +2829,12 @@ static int cgroup_addrm_files(struct cgr
 	int err, ret = 0;
 
 	for (cft = cfts; cft->name[0] != '\0'; cft++) {
+		/* does cft->flags tell us to skip this file on @cgrp? */
+		if ((cft->flags & CFTYPE_NOT_ON_ROOT) && !cgrp->parent)
+			continue;
+		if ((cft->flags & CFTYPE_ONLY_ON_ROOT) && cgrp->parent)
+			continue;
+
 		if (is_add)
 			err = cgroup_add_file(cgrp, subsys, cft);
 		else


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