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>

3 files changed, 7 insertions, 33 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index baf852b648ad..6b96892015ec 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -376,21 +376,6 @@ static const struct file_operations proc_lstats_operations = {
 
 #endif
 
-#ifdef CONFIG_CGROUPS
-static int cgroup_open(struct inode *inode, struct file *file)
-{
-        struct pid *pid = PROC_I(inode)->pid;
-        return single_open(file, proc_cgroup_show, pid);
-}
-
-static const struct file_operations proc_cgroup_operations = {
-        .open           = cgroup_open,
-        .read           = seq_read,
-        .llseek         = seq_lseek,
-        .release        = single_release,
-};
-#endif
-
 #ifdef CONFIG_PROC_PID_CPUSET
 
 static int cpuset_open(struct inode *inode, struct file *file)
@@ -2576,7 +2561,7 @@ static const struct pid_entry tgid_base_stuff[] = {
         REG("cpuset",     S_IRUGO, proc_cpuset_operations),
 #endif
 #ifdef CONFIG_CGROUPS
-        REG("cgroup",  S_IRUGO, proc_cgroup_operations),
+        ONE("cgroup",  S_IRUGO, proc_cgroup_show),
 #endif
         ONE("oom_score",  S_IRUGO, proc_oom_score),
         REG("oom_adj",    S_IRUGO|S_IWUSR, proc_oom_adj_operations),
@@ -2922,7 +2907,7 @@ static const struct pid_entry tid_base_stuff[] = {
         REG("cpuset",    S_IRUGO, proc_cpuset_operations),
 #endif
 #ifdef CONFIG_CGROUPS
-        REG("cgroup",  S_IRUGO, proc_cgroup_operations),
+        ONE("cgroup",  S_IRUGO, proc_cgroup_show),
 #endif
         ONE("oom_score", S_IRUGO, proc_oom_score),
         REG("oom_adj",   S_IRUGO|S_IWUSR, proc_oom_adj_operations),
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 51958d0fb88f..77a1d37b742b 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -37,7 +37,8 @@ extern void cgroup_exit(struct task_struct *p);
 extern int cgroupstats_build(struct cgroupstats *stats,
                                 struct dentry *dentry);
 
-extern int proc_cgroup_show(struct seq_file *, void *);
+extern int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
+                            struct pid *pid, struct task_struct *tsk);
 
 /* define the enumeration of all cgroup subsystems */
 #define SUBSYS(_x) _x ## _cgrp_id,
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index db19a4884a7f..df7733b48d2e 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5030,12 +5030,9 @@ core_initcall(cgroup_wq_init);
  *  - Print task's cgroup paths into seq_file, one line for each hierarchy
  *  - Used for /proc/<pid>/cgroup.
  */
-
-/* TODO: Use a proper seq_file iterator */
-int proc_cgroup_show(struct seq_file *m, void *v)
+int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
+                     struct pid *pid, struct task_struct *tsk)
 {
-        struct pid *pid;
-        struct task_struct *tsk;
         char *buf, *path;
         int retval;
         struct cgroup_root *root;
@@ -5045,14 +5042,6 @@ int proc_cgroup_show(struct seq_file *m, void *v)
         if (!buf)
                 goto out;
 
-        retval = -ESRCH;
-        pid = m->private;
-        tsk = get_pid_task(pid, PIDTYPE_PID);
-        if (!tsk)
-                goto out_free;
-
-        retval = 0;
-
         mutex_lock(&cgroup_mutex);
         down_read(&css_set_rwsem);
 
@@ -5082,11 +5071,10 @@ int proc_cgroup_show(struct seq_file *m, void *v)
                 seq_putc(m, '\n');
         }
 
+        retval = 0;
 out_unlock:
         up_read(&css_set_rwsem);
         mutex_unlock(&cgroup_mutex);
-        put_task_struct(tsk);
-out_free:
         kfree(buf);
 out:
         return retval;