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cgroup_rm_file: don't delete the uncreated files

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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@cn.fujitsu.com>
Acked-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Gao feng 2012-12-06 14:38:57 +08:00 committed by Tejun Heo
parent 7083d0378a
commit f33fddc2b9
1 changed files with 6 additions and 6 deletions
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12
kernel/cgroup.c
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@ -2724,12 +2724,6 @@ static int cgroup_add_file(struct cgroup *cgrp, struct cgroup_subsys *subsys,
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, ".");
@ -2770,6 +2764,12 @@ static int cgroup_addrm_files(struct cgroup *cgrp, struct cgroup_subsys *subsys,
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