+static void *cgroup_tasks_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct cgroup *cgrp = s->private;
+ int *p = v;
+ int *end = cgrp->tasks_pids + cgrp->pids_length;
+
+ /*
+ * Advance to the next pid in the array. If this goes off the
+ * end, we're done
+ */
+ p++;
+ if (p >= end) {
+ return NULL;
+ } else {
+ *pos = *p;
+ return p;
+ }
+}
+
+static int cgroup_tasks_show(struct seq_file *s, void *v)
+{
+ return seq_printf(s, "%d\n", *(int *)v);
+}
+
+static struct seq_operations cgroup_tasks_seq_operations = {
+ .start = cgroup_tasks_start,
+ .stop = cgroup_tasks_stop,
+ .next = cgroup_tasks_next,
+ .show = cgroup_tasks_show,
+};
+
+static void release_cgroup_pid_array(struct cgroup *cgrp)
+{
+ down_write(&cgrp->pids_mutex);
+ BUG_ON(!cgrp->pids_use_count);
+ if (!--cgrp->pids_use_count) {
+ kfree(cgrp->tasks_pids);
+ cgrp->tasks_pids = NULL;
+ cgrp->pids_length = 0;
+ }
+ up_write(&cgrp->pids_mutex);
+}
+
+static int cgroup_tasks_release(struct inode *inode, struct file *file)
+{
+ struct cgroup *cgrp = __d_cgrp(file->f_dentry->d_parent);
+
+ if (!(file->f_mode & FMODE_READ))
+ return 0;
+
+ release_cgroup_pid_array(cgrp);
+ return seq_release(inode, file);
+}
+
+static struct file_operations cgroup_tasks_operations = {
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = cgroup_file_write,
+ .release = cgroup_tasks_release,
+};
+