cgroup: simplify proc_cgroup_show()
Use the ONE macro instead of REG, and we can simplify proc_cgroup_show(). Signed-off-by: Zefan Li <lizefan@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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971ff49355
Коммит
006f4ac497
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@ -376,21 +376,6 @@ static const struct file_operations proc_lstats_operations = {
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#endif
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#ifdef CONFIG_CGROUPS
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static int cgroup_open(struct inode *inode, struct file *file)
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{
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struct pid *pid = PROC_I(inode)->pid;
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return single_open(file, proc_cgroup_show, pid);
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}
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static const struct file_operations proc_cgroup_operations = {
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.open = cgroup_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#endif
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#ifdef CONFIG_PROC_PID_CPUSET
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static int cpuset_open(struct inode *inode, struct file *file)
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@ -2576,7 +2561,7 @@ static const struct pid_entry tgid_base_stuff[] = {
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REG("cpuset", S_IRUGO, proc_cpuset_operations),
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#endif
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#ifdef CONFIG_CGROUPS
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REG("cgroup", S_IRUGO, proc_cgroup_operations),
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ONE("cgroup", S_IRUGO, proc_cgroup_show),
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#endif
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ONE("oom_score", S_IRUGO, proc_oom_score),
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REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
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@ -2922,7 +2907,7 @@ static const struct pid_entry tid_base_stuff[] = {
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REG("cpuset", S_IRUGO, proc_cpuset_operations),
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#endif
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#ifdef CONFIG_CGROUPS
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REG("cgroup", S_IRUGO, proc_cgroup_operations),
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ONE("cgroup", S_IRUGO, proc_cgroup_show),
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#endif
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ONE("oom_score", S_IRUGO, proc_oom_score),
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REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
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@ -37,7 +37,8 @@ extern void cgroup_exit(struct task_struct *p);
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extern int cgroupstats_build(struct cgroupstats *stats,
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struct dentry *dentry);
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extern int proc_cgroup_show(struct seq_file *, void *);
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extern int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *tsk);
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/* define the enumeration of all cgroup subsystems */
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#define SUBSYS(_x) _x ## _cgrp_id,
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@ -5030,12 +5030,9 @@ core_initcall(cgroup_wq_init);
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* - Print task's cgroup paths into seq_file, one line for each hierarchy
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* - Used for /proc/<pid>/cgroup.
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*/
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/* TODO: Use a proper seq_file iterator */
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int proc_cgroup_show(struct seq_file *m, void *v)
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int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *tsk)
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{
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struct pid *pid;
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struct task_struct *tsk;
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char *buf, *path;
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int retval;
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struct cgroup_root *root;
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@ -5045,14 +5042,6 @@ int proc_cgroup_show(struct seq_file *m, void *v)
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if (!buf)
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goto out;
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retval = -ESRCH;
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pid = m->private;
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tsk = get_pid_task(pid, PIDTYPE_PID);
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if (!tsk)
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goto out_free;
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retval = 0;
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mutex_lock(&cgroup_mutex);
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down_read(&css_set_rwsem);
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@ -5082,11 +5071,10 @@ int proc_cgroup_show(struct seq_file *m, void *v)
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seq_putc(m, '\n');
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}
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retval = 0;
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out_unlock:
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up_read(&css_set_rwsem);
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mutex_unlock(&cgroup_mutex);
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put_task_struct(tsk);
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out_free:
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kfree(buf);
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out:
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return retval;
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