diff options
Diffstat (limited to 'kernel/pid.c')
| -rw-r--r-- | kernel/pid.c | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index b13b624e2c49..ed6c343fe50d 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -41,7 +41,19 @@ #include <linux/sched/task.h> #include <linux/idr.h> -struct pid init_struct_pid = INIT_STRUCT_PID; +struct pid init_struct_pid = { + .count = ATOMIC_INIT(1), + .tasks = { + { .first = NULL }, + { .first = NULL }, + { .first = NULL }, + }, + .level = 0, + .numbers = { { + .nr = 0, + .ns = &init_pid_ns, + }, } +}; int pid_max = PID_MAX_DEFAULT; @@ -193,10 +205,8 @@ struct pid *alloc_pid(struct pid_namespace *ns) } if (unlikely(is_child_reaper(pid))) { - if (pid_ns_prepare_proc(ns)) { - disable_pid_allocation(ns); + if (pid_ns_prepare_proc(ns)) goto out_free; - } } get_pid_ns(ns); @@ -226,6 +236,10 @@ out_free: while (++i <= ns->level) idr_remove(&ns->idr, (pid->numbers + i)->nr); + /* On failure to allocate the first pid, reset the state */ + if (ns->pid_allocated == PIDNS_ADDING) + idr_set_cursor(&ns->idr, 0); + spin_unlock_irq(&pidmap_lock); kmem_cache_free(ns->pid_cachep, pid); @@ -329,6 +343,19 @@ struct task_struct *find_task_by_vpid(pid_t vnr) return find_task_by_pid_ns(vnr, task_active_pid_ns(current)); } +struct task_struct *find_get_task_by_vpid(pid_t nr) +{ + struct task_struct *task; + + rcu_read_lock(); + task = find_task_by_vpid(nr); + if (task) + get_task_struct(task); + rcu_read_unlock(); + + return task; +} + struct pid *get_task_pid(struct task_struct *task, enum pid_type type) { struct pid *pid; |