1 files changed, 142 insertions, 5 deletions

diff --git a/fs/proc/array.c b/fs/proc/array.c
index dc4c5a7b9ece..c1c207c36cae 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -370,7 +370,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
                         struct pid *pid, struct task_struct *task, int whole)
 {
         unsigned long vsize, eip, esp, wchan = ~0UL;
-        long priority, nice;
+        int priority, nice;
         int tty_pgrp = -1, tty_nr = 0;
         sigset_t sigign, sigcatch;
         char state;
@@ -492,7 +492,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
         seq_put_decimal_ull(m, ' ', 0);
         seq_put_decimal_ull(m, ' ', start_time);
         seq_put_decimal_ull(m, ' ', vsize);
-        seq_put_decimal_ll(m, ' ', mm ? get_mm_rss(mm) : 0);
+        seq_put_decimal_ull(m, ' ', mm ? get_mm_rss(mm) : 0);
         seq_put_decimal_ull(m, ' ', rsslim);
         seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->start_code : 1) : 0);
         seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->end_code : 1) : 0);
@@ -517,9 +517,23 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
         seq_put_decimal_ull(m, ' ', delayacct_blkio_ticks(task));
         seq_put_decimal_ull(m, ' ', cputime_to_clock_t(gtime));
         seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cgtime));
-        seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->start_data : 0);
-        seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->end_data : 0);
-        seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->start_brk : 0);
+
+        if (mm && permitted) {
+                seq_put_decimal_ull(m, ' ', mm->start_data);
+                seq_put_decimal_ull(m, ' ', mm->end_data);
+                seq_put_decimal_ull(m, ' ', mm->start_brk);
+                seq_put_decimal_ull(m, ' ', mm->arg_start);
+                seq_put_decimal_ull(m, ' ', mm->arg_end);
+                seq_put_decimal_ull(m, ' ', mm->env_start);
+                seq_put_decimal_ull(m, ' ', mm->env_end);
+        } else
+                seq_printf(m, " 0 0 0 0 0 0 0");
+
+        if (permitted)
+                seq_put_decimal_ll(m, ' ', task->exit_code);
+        else
+                seq_put_decimal_ll(m, ' ', 0);
+
         seq_putc(m, '\n');
         if (mm)
                 mmput(mm);
@@ -565,3 +579,126 @@ int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
 
         return 0;
 }
+
+#ifdef CONFIG_CHECKPOINT_RESTORE
+static struct pid *
+get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
+{
+        struct task_struct *start, *task;
+        struct pid *pid = NULL;
+
+        read_lock(&tasklist_lock);
+
+        start = pid_task(proc_pid(inode), PIDTYPE_PID);
+        if (!start)
+                goto out;
+
+        /*
+         * Lets try to continue searching first, this gives
+         * us significant speedup on children-rich processes.
+         */
+        if (pid_prev) {
+                task = pid_task(pid_prev, PIDTYPE_PID);
+                if (task && task->real_parent == start &&
+                    !(list_empty(&task->sibling))) {
+                        if (list_is_last(&task->sibling, &start->children))
+                                goto out;
+                        task = list_first_entry(&task->sibling,
+                                                struct task_struct, sibling);
+                        pid = get_pid(task_pid(task));
+                        goto out;
+                }
+        }
+
+        /*
+         * Slow search case.
+         *
+         * We might miss some children here if children
+         * are exited while we were not holding the lock,
+         * but it was never promised to be accurate that
+         * much.
+         *
+         * "Just suppose that the parent sleeps, but N children
+         *  exit after we printed their tids. Now the slow paths
+         *  skips N extra children, we miss N tasks." (c)
+         *
+         * So one need to stop or freeze the leader and all
+         * its children to get a precise result.
+         */
+        list_for_each_entry(task, &start->children, sibling) {
+                if (pos-- == 0) {
+                        pid = get_pid(task_pid(task));
+                        break;
+                }
+        }
+
+out:
+        read_unlock(&tasklist_lock);
+        return pid;
+}
+
+static int children_seq_show(struct seq_file *seq, void *v)
+{
+        struct inode *inode = seq->private;
+        pid_t pid;
+
+        pid = pid_nr_ns(v, inode->i_sb->s_fs_info);
+        return seq_printf(seq, "%d ", pid);
+}
+
+static void *children_seq_start(struct seq_file *seq, loff_t *pos)
+{
+        return get_children_pid(seq->private, NULL, *pos);
+}
+
+static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+        struct pid *pid;
+
+        pid = get_children_pid(seq->private, v, *pos + 1);
+        put_pid(v);
+
+        ++*pos;
+        return pid;
+}
+
+static void children_seq_stop(struct seq_file *seq, void *v)
+{
+        put_pid(v);
+}
+
+static const struct seq_operations children_seq_ops = {
+        .start  = children_seq_start,
+        .next   = children_seq_next,
+        .stop   = children_seq_stop,
+        .show   = children_seq_show,
+};
+
+static int children_seq_open(struct inode *inode, struct file *file)
+{
+        struct seq_file *m;
+        int ret;
+
+        ret = seq_open(file, &children_seq_ops);
+        if (ret)
+                return ret;
+
+        m = file->private_data;
+        m->private = inode;
+
+        return ret;
+}
+
+int children_seq_release(struct inode *inode, struct file *file)
+{
+        seq_release(inode, file);
+        return 0;
+}
+
+const struct file_operations proc_tid_children_operations = {
+        .open    = children_seq_open,
+        .read    = seq_read,
+        .llseek  = seq_lseek,
+        .release = children_seq_release,
+};
+#endif /* CONFIG_CHECKPOINT_RESTORE */