include/linux/init_task.h

   1 #ifndef _LINUX__INIT_TASK_H
   2 #define _LINUX__INIT_TASK_H
   3
   4 #include <linux/rcupdate.h>
   5 #include <linux/irqflags.h>
   6 #include <linux/utsname.h>
   7 #include <linux/lockdep.h>
   8 #include <linux/ftrace.h>
   9 #include <linux/ipc.h>
  10 #include <linux/pid_namespace.h>
  11 #include <linux/user_namespace.h>
  12 #include <linux/securebits.h>
  13 #include <net/net_namespace.h>
  14
  15 extern struct files_struct init_files;
  16 extern struct fs_struct init_fs;
  17
  18 #define INIT_SIGNALS(sig) {                                             \
  19         .count          = ATOMIC_INIT(1),                               \
  20         .wait_chldexit  = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
  21         .shared_pending = {                                             \
  22                 .list = LIST_HEAD_INIT(sig.shared_pending.list),        \
  23                 .signal =  {{0}}},                                      \
  24         .posix_timers    = LIST_HEAD_INIT(sig.posix_timers),            \
  25         .cpu_timers     = INIT_CPU_TIMERS(sig.cpu_timers),              \
  26         .rlim           = INIT_RLIMITS,                                 \
  27         .cputimer       = {                                             \
  28                 .cputime = INIT_CPUTIME,                                \
  29                 .running = 0,                                           \
  30                 .lock = __SPIN_LOCK_UNLOCKED(sig.cputimer.lock),        \
  31         },                                                              \
  32 }
  33
  34 extern struct nsproxy init_nsproxy;
  35 #define INIT_NSPROXY(nsproxy) {                                         \
  36         .pid_ns         = &init_pid_ns,                                 \
  37         .count          = ATOMIC_INIT(1),                               \
  38         .uts_ns         = &init_uts_ns,                                 \
  39         .mnt_ns         = NULL,                                         \
  40         INIT_NET_NS(net_ns)                                             \
  41         INIT_IPC_NS(ipc_ns)                                             \
  42 }
  43
  44 #define INIT_SIGHAND(sighand) {                                         \
  45         .count          = ATOMIC_INIT(1),                               \
  46         .action         = { { { .sa_handler = NULL, } }, },             \
  47         .siglock        = __SPIN_LOCK_UNLOCKED(sighand.siglock),        \
  48         .signalfd_wqh   = __WAIT_QUEUE_HEAD_INITIALIZER(sighand.signalfd_wqh),  \
  49 }
  50
  51 extern struct group_info init_groups;
  52
  53 #define INIT_STRUCT_PID {                                               \
  54         .count          = ATOMIC_INIT(1),                               \
  55         .tasks          = {                                             \
  56                 { .first = &init_task.pids[PIDTYPE_PID].node },         \
  57                 { .first = &init_task.pids[PIDTYPE_PGID].node },        \
  58                 { .first = &init_task.pids[PIDTYPE_SID].node },         \
  59         },                                                              \
  60         .rcu            = RCU_HEAD_INIT,                                \
  61         .level          = 0,                                            \
  62         .numbers        = { {                                           \
  63                 .nr             = 0,                                    \
  64                 .ns             = &init_pid_ns,                         \
  65                 .pid_chain      = { .next = NULL, .pprev = NULL },      \
  66         }, }                                                            \
  67 }
  68
  69 #define INIT_PID_LINK(type)                                     \
  70 {                                                               \
  71         .node = {                                               \
  72                 .next = NULL,                                   \
  73                 .pprev = &init_struct_pid.tasks[type].first,    \
  74         },                                                      \
  75         .pid = &init_struct_pid,                                \
  76 }
  77
  78 #ifdef CONFIG_AUDITSYSCALL
  79 #define INIT_IDS \
  80         .loginuid = -1, \
  81         .sessionid = -1,
  82 #else
  83 #define INIT_IDS
  84 #endif
  85
  86 /*
  87  * Because of the reduced scope of CAP_SETPCAP when filesystem
  88  * capabilities are in effect, it is safe to allow CAP_SETPCAP to
  89  * be available in the default configuration.
  90  */
  91 # define CAP_INIT_BSET  CAP_FULL_SET
  92
  93 #ifdef CONFIG_TREE_PREEMPT_RCU
  94 #define INIT_TASK_RCU_PREEMPT(tsk)                                      \
  95         .rcu_read_lock_nesting = 0,                                     \
  96         .rcu_read_unlock_special = 0,                                   \
  97         .rcu_blocked_node = NULL,                                       \
  98         .rcu_node_entry = LIST_HEAD_INIT(tsk.rcu_node_entry),
  99 #else
 100 #define INIT_TASK_RCU_PREEMPT(tsk)
 101 #endif
 102
 103 extern struct cred init_cred;
 104
 105 #ifdef CONFIG_PERF_EVENTS
 106 # define INIT_PERF_EVENTS(tsk)                                  \
 107         .perf_event_mutex =                                             \
 108                  __MUTEX_INITIALIZER(tsk.perf_event_mutex),             \
 109         .perf_event_list = LIST_HEAD_INIT(tsk.perf_event_list),
 110 #else
 111 # define INIT_PERF_EVENTS(tsk)
 112 #endif
 113
 114 /*
 115  *  INIT_TASK is used to set up the first task table, touch at
 116  * your own risk!. Base=0, limit=0x1fffff (=2MB)
 117  */
 118 #define INIT_TASK(tsk)  \
 119 {                                                                       \
 120         .state          = 0,                                            \
 121         .stack          = &init_thread_info,                            \
 122         .usage          = ATOMIC_INIT(2),                               \
 123         .flags          = PF_KTHREAD,                                   \
 124         .lock_depth     = -1,                                           \
 125         .prio           = MAX_PRIO-20,                                  \
 126         .static_prio    = MAX_PRIO-20,                                  \
 127         .normal_prio    = MAX_PRIO-20,                                  \
 128         .policy         = SCHED_NORMAL,                                 \
 129         .cpus_allowed   = CPU_MASK_ALL,                                 \
 130         .mm             = NULL,                                         \
 131         .active_mm      = &init_mm,                                     \
 132         .se             = {                                             \
 133                 .group_node     = LIST_HEAD_INIT(tsk.se.group_node),    \
 134         },                                                              \
 135         .rt             = {                                             \
 136                 .run_list       = LIST_HEAD_INIT(tsk.rt.run_list),      \
 137                 .time_slice     = HZ,                                   \
 138                 .nr_cpus_allowed = NR_CPUS,                             \
 139         },                                                              \
 140         .tasks          = LIST_HEAD_INIT(tsk.tasks),                    \
 141         .pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO), \
 142         .ptraced        = LIST_HEAD_INIT(tsk.ptraced),                  \
 143         .ptrace_entry   = LIST_HEAD_INIT(tsk.ptrace_entry),             \
 144         .real_parent    = &tsk,                                         \
 145         .parent         = &tsk,                                         \
 146         .children       = LIST_HEAD_INIT(tsk.children),                 \
 147         .sibling        = LIST_HEAD_INIT(tsk.sibling),                  \
 148         .group_leader   = &tsk,                                         \
 149         .real_cred      = &init_cred,                                   \
 150         .cred           = &init_cred,                                   \
 151         .cred_guard_mutex =                                             \
 152                  __MUTEX_INITIALIZER(tsk.cred_guard_mutex),             \
 153         .comm           = "swapper",                                    \
 154         .thread         = INIT_THREAD,                                  \
 155         .fs             = &init_fs,                                     \
 156         .files          = &init_files,                                  \
 157         .signal         = &init_signals,                                \
 158         .sighand        = &init_sighand,                                \
 159         .nsproxy        = &init_nsproxy,                                \
 160         .pending        = {                                             \
 161                 .list = LIST_HEAD_INIT(tsk.pending.list),               \
 162                 .signal = {{0}}},                                       \
 163         .blocked        = {{0}},                                        \
 164         .alloc_lock     = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock),         \
 165         .journal_info   = NULL,                                         \
 166         .cpu_timers     = INIT_CPU_TIMERS(tsk.cpu_timers),              \
 167         .fs_excl        = ATOMIC_INIT(0),                               \
 168         .pi_lock        = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock),        \
 169         .timer_slack_ns = 50000, /* 50 usec default slack */            \
 170         .pids = {                                                       \
 171                 [PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),            \
 172                 [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),           \
 173                 [PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),            \
 174         },                                                              \
 175         .dirties = INIT_PROP_LOCAL_SINGLE(dirties),                     \
 176         INIT_IDS                                                        \
 177         INIT_PERF_EVENTS(tsk)                                           \
 178         INIT_TRACE_IRQFLAGS                                             \
 179         INIT_LOCKDEP                                                    \
 180         INIT_FTRACE_GRAPH                                               \
 181         INIT_TRACE_RECURSION                                            \
 182         INIT_TASK_RCU_PREEMPT(tsk)                                      \
 183 }
 184
 185
 186 #define INIT_CPU_TIMERS(cpu_timers)                                     \
 187 {                                                                       \
 188         LIST_HEAD_INIT(cpu_timers[0]),                                  \
 189         LIST_HEAD_INIT(cpu_timers[1]),                                  \
 190         LIST_HEAD_INIT(cpu_timers[2]),                                  \
 191 }
 192
 193 /* Attach to the init_task data structure for proper alignment */
 194 #define __init_task_data __attribute__((__section__(".data.init_task")))
 195
 196
 197 #endif