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cgroup: CGRP_ROOT_SUBSYS_BOUND should also be ignored when mounting an existing hierarchy

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0ce6cba357 ("cgroup: CGRP_ROOT_SUBSYS_BOUND should be ignored when
comparing mount options") only updated the remount path but
CGRP_ROOT_SUBSYS_BOUND should also be ignored when comparing options
while mounting an existing hierarchy.  As option mismatch triggers a
warning but doesn't fail the mount without sane_behavior, this only
triggers a spurious warning message.

Fix it by only comparing CGRP_ROOT_OPTION_MASK bits when comparing new
and existing root options.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2013-06-29 14:06:10 -07:00
parent 0ce6cba357
commit c7ba8287cd
1 changed files with 1 additions and 1 deletions
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kernel/cgroup.c
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@ -1703,7 +1703,7 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
*/
cgroup_free_root(opts.new_root);
if (root->flags != opts.flags) {
if ((root->flags ^ opts.flags) & CGRP_ROOT_OPTION_MASK) {
if ((root->flags | opts.flags) & CGRP_ROOT_SANE_BEHAVIOR) {
pr_err("cgroup: sane_behavior: new mount options should match the existing superblock\n");
ret = -EINVAL;