#define CLONE_NEWUTS 0x04000000 /* New utsname group? */
#define CLONE_NEWIPC 0x08000000 /* New ipcs */
#define CLONE_NEWUSER 0x10000000 /* New user namespace */
+#define CLONE_NEWPID 0x20000000 /* New pid namespace */
#define CLONE_NEWNET 0x40000000 /* New network namespace */
/*
cputime_t it_prof_incr, it_virt_incr;
/* job control IDs */
- pid_t pgrp;
+
+ /*
+ * pgrp and session fields are deprecated.
+ * use the task_session_Xnr and task_pgrp_Xnr routines below
+ */
+
+ union {
+ pid_t pgrp __deprecated;
+ pid_t __pgrp;
+ };
+
struct pid *tty_old_pgrp;
union {
#endif
};
+extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new);
+
#endif /* CONFIG_SMP */
/*
}
struct io_context; /* See blkdev.h */
-struct cpuset;
-
#define NGROUPS_SMALL 32
#define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
struct group_info {
#endif
};
-#ifdef CONFIG_CGROUPS
-
-#define SUBSYS(_x) _x ## _subsys_id,
-enum cgroup_subsys_id {
-#include <linux/cgroup_subsys.h>
- CGROUP_SUBSYS_COUNT
-};
-#undef SUBSYS
-
-/* A css_set is a structure holding pointers to a set of
- * cgroup_subsys_state objects.
- */
-
-struct css_set {
-
- /* Set of subsystem states, one for each subsystem. NULL for
- * subsystems that aren't part of this hierarchy. These
- * pointers reduce the number of dereferences required to get
- * from a task to its state for a given cgroup, but result
- * in increased space usage if tasks are in wildly different
- * groupings across different hierarchies. This array is
- * immutable after creation */
- struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
-
-};
-
-#endif /* CONFIG_CGROUPS */
-
struct task_struct {
volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
void *stack;
short il_next;
#endif
#ifdef CONFIG_CPUSETS
- struct cpuset *cpuset;
nodemask_t mems_allowed;
int cpuset_mems_generation;
int cpuset_mem_spread_rotor;
#endif
#ifdef CONFIG_CGROUPS
- struct css_set cgroups;
+ /* Control Group info protected by css_set_lock */
+ struct css_set *cgroups;
+ /* cg_list protected by css_set_lock and tsk->alloc_lock */
+ struct list_head cg_list;
#endif
#ifdef CONFIG_FUTEX
struct robust_list_head __user *robust_list;
return rt_prio(p->prio);
}
-static inline pid_t process_group(struct task_struct *tsk)
-{
- return tsk->signal->pgrp;
-}
-
-static inline pid_t signal_session(struct signal_struct *sig)
-{
- return sig->__session;
-}
-
-static inline pid_t process_session(struct task_struct *tsk)
+static inline void set_task_session(struct task_struct *tsk, pid_t session)
{
- return signal_session(tsk->signal);
+ tsk->signal->__session = session;
}
-static inline void set_signal_session(struct signal_struct *sig, pid_t session)
+static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
{
- sig->__session = session;
+ tsk->signal->__pgrp = pgrp;
}
static inline struct pid *task_pid(struct task_struct *task)
return task->group_leader->pids[PIDTYPE_SID].pid;
}
+struct pid_namespace;
+
+/*
+ * the helpers to get the task's different pids as they are seen
+ * from various namespaces
+ *
+ * task_xid_nr() : global id, i.e. the id seen from the init namespace;
+ * task_xid_vnr() : virtual id, i.e. the id seen from the namespace the task
+ * belongs to. this only makes sence when called in the
+ * context of the task that belongs to the same namespace;
+ * task_xid_nr_ns() : id seen from the ns specified;
+ *
+ * set_task_vxid() : assigns a virtual id to a task;
+ *
+ * task_ppid_nr_ns() : the parent's id as seen from the namespace specified.
+ * the result depends on the namespace and whether the
+ * task in question is the namespace's init. e.g. for the
+ * namespace's init this will return 0 when called from
+ * the namespace of this init, or appropriate id otherwise.
+ *
+ *
+ * see also pid_nr() etc in include/linux/pid.h
+ */
+
+static inline pid_t task_pid_nr(struct task_struct *tsk)
+{
+ return tsk->pid;
+}
+
+pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
+
+static inline pid_t task_pid_vnr(struct task_struct *tsk)
+{
+ return pid_vnr(task_pid(tsk));
+}
+
+
+static inline pid_t task_tgid_nr(struct task_struct *tsk)
+{
+ return tsk->tgid;
+}
+
+pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
+
+static inline pid_t task_tgid_vnr(struct task_struct *tsk)
+{
+ return pid_vnr(task_tgid(tsk));
+}
+
+
+static inline pid_t task_pgrp_nr(struct task_struct *tsk)
+{
+ return tsk->signal->__pgrp;
+}
+
+pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
+
+static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
+{
+ return pid_vnr(task_pgrp(tsk));
+}
+
+
+static inline pid_t task_session_nr(struct task_struct *tsk)
+{
+ return tsk->signal->__session;
+}
+
+pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
+
+static inline pid_t task_session_vnr(struct task_struct *tsk)
+{
+ return pid_vnr(task_session(tsk));
+}
+
+
+static inline pid_t task_ppid_nr_ns(struct task_struct *tsk,
+ struct pid_namespace *ns)
+{
+ return pid_nr_ns(task_pid(rcu_dereference(tsk->real_parent)), ns);
+}
+
/**
* pid_alive - check that a task structure is not stale
* @p: Task structure to be checked.
}
/**
- * is_init - check if a task structure is init
+ * is_global_init - check if a task structure is init
* @tsk: Task structure to be checked.
*
* Check if a task structure is the first user space task the kernel created.
*/
-static inline int is_init(struct task_struct *tsk)
+static inline int is_global_init(struct task_struct *tsk)
{
return tsk->pid == 1;
}
+/*
+ * is_container_init:
+ * check whether in the task is init in its own pid namespace.
+ */
+extern int is_container_init(struct task_struct *tsk);
+
extern struct pid *cad_pid;
extern void free_task(struct task_struct *tsk);
extern struct mm_struct init_mm;
-#define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
-extern struct task_struct *find_task_by_pid_type(int type, int pid);
+extern struct pid_namespace init_pid_ns;
+
+/*
+ * find a task by one of its numerical ids
+ *
+ * find_task_by_pid_type_ns():
+ * it is the most generic call - it finds a task by all id,
+ * type and namespace specified
+ * find_task_by_pid_ns():
+ * finds a task by its pid in the specified namespace
+ * find_task_by_vpid():
+ * finds a task by its virtual pid
+ * find_task_by_pid():
+ * finds a task by its global pid
+ *
+ * see also find_pid() etc in include/linux/pid.h
+ */
+
+extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
+ struct pid_namespace *ns);
+
+extern struct task_struct *find_task_by_pid(pid_t nr);
+extern struct task_struct *find_task_by_vpid(pid_t nr);
+extern struct task_struct *find_task_by_pid_ns(pid_t nr,
+ struct pid_namespace *ns);
+
extern void __set_special_pids(pid_t session, pid_t pgrp);
/* per-UID process charging. */
return p->pid == p->tgid;
}
+static inline
+int same_thread_group(struct task_struct *p1, struct task_struct *p2)
+{
+ return p1->tgid == p2->tgid;
+}
+
static inline struct task_struct *next_thread(const struct task_struct *p)
{
return list_entry(rcu_dereference(p->thread_group.next),
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