Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[linux-2.6-omap-h63xx.git] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5a50fdef5be5a208af6e66b5aacca1e3871287b1..b94f3541f67be00802c28f22fa5b56f9e8c91e55 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -68,7 +68,7 @@ struct sched_param {
 #include <linux/smp.h>
 #include <linux/sem.h>
 #include <linux/signal.h>
-#include <linux/fs_struct.h>
+#include <linux/path.h>
 #include <linux/compiler.h>
 #include <linux/completion.h>
 #include <linux/pid.h>
@@ -97,6 +97,7 @@ struct futex_pi_state;
 struct robust_list_head;
 struct bio;
 struct bts_tracer;
+struct fs_struct;
 
 /*
  * List of flags we want to share for kernel threads,
@@ -549,25 +550,8 @@ struct signal_struct {
 
        struct list_head cpu_timers[3];
 
-       /* job control IDs */
-
-       /*
-        * 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 {
-               pid_t session __deprecated;
-               pid_t __session;
-       };
-
        /* boolean value for session group leader */
        int leader;
 
@@ -1473,16 +1457,6 @@ static inline int rt_task(struct task_struct *p)
        return rt_prio(p->prio);
 }
 
-static inline void set_task_session(struct task_struct *tsk, pid_t session)
-{
-       tsk->signal->__session = session;
-}
-
-static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
-{
-       tsk->signal->__pgrp = pgrp;
-}
-
 static inline struct pid *task_pid(struct task_struct *task)
 {
        return task->pids[PIDTYPE_PID].pid;
@@ -1493,6 +1467,11 @@ static inline struct pid *task_tgid(struct task_struct *task)
        return task->group_leader->pids[PIDTYPE_PID].pid;
 }
 
+/*
+ * Without tasklist or rcu lock it is not safe to dereference
+ * the result of task_pgrp/task_session even if task == current,
+ * we can race with another thread doing sys_setsid/sys_setpgid.
+ */
 static inline struct pid *task_pgrp(struct task_struct *task)
 {
        return task->group_leader->pids[PIDTYPE_PGID].pid;
@@ -1518,17 +1497,23 @@ struct pid_namespace;
  *
  * see also pid_nr() etc in include/linux/pid.h
  */
+pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
+                       struct pid_namespace *ns);
 
 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_nr_ns(struct task_struct *tsk,
+                                       struct pid_namespace *ns)
+{
+       return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
+}
 
 static inline pid_t task_pid_vnr(struct task_struct *tsk)
 {
-       return pid_vnr(task_pid(tsk));
+       return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
 }
 
 
@@ -1545,31 +1530,34 @@ static inline pid_t task_tgid_vnr(struct task_struct *tsk)
 }
 
 
-static inline pid_t task_pgrp_nr(struct task_struct *tsk)
+static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
+                                       struct pid_namespace *ns)
 {
-       return tsk->signal->__pgrp;
+       return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
 }
 
-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));
+       return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
 }
 
 
-static inline pid_t task_session_nr(struct task_struct *tsk)
+static inline pid_t task_session_nr_ns(struct task_struct *tsk,
+                                       struct pid_namespace *ns)
 {
-       return tsk->signal->__session;
+       return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
 }
 
-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));
+       return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
 }
 
+/* obsolete, do not use */
+static inline pid_t task_pgrp_nr(struct task_struct *tsk)
+{
+       return task_pgrp_nr_ns(tsk, &init_pid_ns);
+}
 
 /**
  * pid_alive - check that a task structure is not stale
@@ -1979,7 +1967,8 @@ extern void mm_release(struct task_struct *, struct mm_struct *);
 /* Allocate a new mm structure and copy contents from tsk->mm */
 extern struct mm_struct *dup_mm(struct task_struct *tsk);
 
-extern int  copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
+extern int copy_thread(unsigned long, unsigned long, unsigned long,
+                       struct task_struct *, struct pt_regs *);
 extern void flush_thread(void);
 extern void exit_thread(void);
 
@@ -2064,6 +2053,11 @@ static inline int thread_group_empty(struct task_struct *p)
 #define delay_group_leader(p) \
                (thread_group_leader(p) && !thread_group_empty(p))
 
+static inline int task_detached(struct task_struct *p)
+{
+       return p->exit_signal == -1;
+}
+
 /*
  * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
  * subscriptions and synchronises with wait4().  Also used in procfs.  Also