cgroup: remove subsystem files when remounting cgroup
cgroup_clear_directroy is called by cgroup_d_remove_dir and cgroup_remount. when we call cgroup_remount to remount the cgroup,the subsystem may be unlinked from cgroupfs_root->subsys_list in rebind_subsystem,this subsystem's files will not be removed in cgroup_clear_directroy. And the system will panic when we try to access these files. this patch removes subsystems's files before rebind_subsystems, if rebind_subsystems failed, repopulate these removed files. With help from Tejun. Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -1349,14 +1349,21 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
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goto out_unlock;
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}
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/*
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* Clear out the files of subsystems that should be removed, do
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* this before rebind_subsystems, since rebind_subsystems may
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* change this hierarchy's subsys_list.
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*/
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cgroup_clear_directory(cgrp->dentry, false, removed_mask);
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ret = rebind_subsystems(root, opts.subsys_mask);
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if (ret) {
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/* rebind_subsystems failed, re-populate the removed files */
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cgroup_populate_dir(cgrp, false, removed_mask);
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drop_parsed_module_refcounts(opts.subsys_mask);
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goto out_unlock;
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}
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/* clear out any existing files and repopulate subsystem files */
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cgroup_clear_directory(cgrp->dentry, false, removed_mask);
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/* re-populate subsystem files */
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cgroup_populate_dir(cgrp, false, added_mask);
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