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/ipc.h>
   9 #include <linux/pid_namespace.h>
  10 #include <linux/user_namespace.h>
  11 #include <linux/securebits.h>
  12 #include <net/net_namespace.h>
  13
  14 extern struct files_struct init_files;
  15 extern struct fs_struct init_fs;
  16
  17 #define INIT_KIOCTX(name, which_mm) \
  18 {                                                       \
  19         .users          = ATOMIC_INIT(1),               \
  20         .dead           = 0,                            \
  21         .mm             = &which_mm,                    \
  22         .user_id        = 0,                            \
  23         .next           = NULL,                         \
  24         .wait           = __WAIT_QUEUE_HEAD_INITIALIZER(name.wait), \
  25         .ctx_lock       = __SPIN_LOCK_UNLOCKED(name.ctx_lock), \
  26         .reqs_active    = 0U,                           \
  27         .max_reqs       = ~0U,                          \
  28 }
  29
  30 #define INIT_MM(name) \
  31 {                                                               \
  32         .mm_rb          = RB_ROOT,                              \
  33         .pgd            = swapper_pg_dir,                       \
  34         .mm_users       = ATOMIC_INIT(2),                       \
  35         .mm_count       = ATOMIC_INIT(1),                       \
  36         .mmap_sem       = __RWSEM_INITIALIZER(name.mmap_sem),   \
  37         .page_table_lock =  __SPIN_LOCK_UNLOCKED(name.page_table_lock), \
  38         .mmlist         = LIST_HEAD_INIT(name.mmlist),          \
  39         .cpu_vm_mask    = CPU_MASK_ALL,                         \
  40 }
  41
  42 #define INIT_SIGNALS(sig) {                                             \
  43         .count          = ATOMIC_INIT(1),                               \
  44         .wait_chldexit  = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
  45         .shared_pending = {                                             \
  46                 .list = LIST_HEAD_INIT(sig.shared_pending.list),        \
  47                 .signal =  {{0}}},                                      \
  48         .posix_timers    = LIST_HEAD_INIT(sig.posix_timers),            \
  49         .cpu_timers     = INIT_CPU_TIMERS(sig.cpu_timers),              \
  50         .rlim           = INIT_RLIMITS,                                 \
  51         .cputimer       = {                                             \
  52                 .cputime = INIT_CPUTIME,                                \
  53                 .running = 0,                                           \
  54                 .lock = __SPIN_LOCK_UNLOCKED(sig.cputimer.lock),        \
  55         },                                                              \
  56 }
  57
  58 extern struct nsproxy init_nsproxy;
  59 #define INIT_NSPROXY(nsproxy) {                                         \
  60         .pid_ns         = &init_pid_ns,                                 \
  61         .count          = ATOMIC_INIT(1),                               \
  62         .uts_ns         = &init_uts_ns,                                 \
  63         .mnt_ns         = NULL,                                         \
  64         INIT_NET_NS(net_ns)                                             \
  65         INIT_IPC_NS(ipc_ns)                                             \
  66 }
  67
  68 #define INIT_SIGHAND(sighand) {                                         \
  69         .count          = ATOMIC_INIT(1),                               \
  70         .action         = { { { .sa_handler = NULL, } }, },             \
  71         .siglock        = __SPIN_LOCK_UNLOCKED(sighand.siglock),        \
  72         .signalfd_wqh   = __WAIT_QUEUE_HEAD_INITIALIZER(sighand.signalfd_wqh),  \
  73 }
  74
  75 extern struct group_info init_groups;
  76
  77 #define INIT_STRUCT_PID {                                               \
  78         .count          = ATOMIC_INIT(1),                               \
  79         .tasks          = {                                             \
  80                 { .first = &init_task.pids[PIDTYPE_PID].node },         \
  81                 { .first = &init_task.pids[PIDTYPE_PGID].node },        \
  82                 { .first = &init_task.pids[PIDTYPE_SID].node },         \
  83         },                                                              \
  84         .rcu            = RCU_HEAD_INIT,                                \
  85         .level          = 0,                                            \
  86         .numbers        = { {                                           \
  87                 .nr             = 0,                                    \
  88                 .ns             = &init_pid_ns,                         \
  89                 .pid_chain      = { .next = NULL, .pprev = NULL },      \
  90         }, }                                                            \
  91 }
  92
  93 #define INIT_PID_LINK(type)                                     \
  94 {                                                               \
  95         .node = {                                               \
  96                 .next = NULL,                                   \
  97                 .pprev = &init_struct_pid.tasks[type].first,    \
  98         },                                                      \
  99         .pid = &init_struct_pid,                                \
 100 }
 101
 102 #ifdef CONFIG_AUDITSYSCALL
 103 #define INIT_IDS \
 104         .loginuid = -1, \
 105         .sessionid = -1,
 106 #else
 107 #define INIT_IDS
 108 #endif
 109
 110 #ifdef CONFIG_SECURITY_FILE_CAPABILITIES
 111 /*
 112  * Because of the reduced scope of CAP_SETPCAP when filesystem
 113  * capabilities are in effect, it is safe to allow CAP_SETPCAP to
 114  * be available in the default configuration.
 115  */
 116 # define CAP_INIT_BSET  CAP_FULL_SET
 117 #else
 118 # define CAP_INIT_BSET  CAP_INIT_EFF_SET
 119 #endif
 120
 121 extern struct cred init_cred;
 122
 123 #ifdef CONFIG_PERF_COUNTERS
 124 # define INIT_PERF_COUNTERS(tsk)                                        \
 125         .perf_counter_ctx.counter_list =                                \
 126                 LIST_HEAD_INIT(tsk.perf_counter_ctx.counter_list),      \
 127         .perf_counter_ctx.lock =                                        \
 128                 __SPIN_LOCK_UNLOCKED(tsk.perf_counter_ctx.lock),
 129 #else
 130 # define INIT_PERF_COUNTERS(tsk)
 131 #endif
 132
 133 /*
 134  *  INIT_TASK is used to set up the first task table, touch at
 135  * your own risk!. Base=0, limit=0x1fffff (=2MB)
 136  */
 137 #define INIT_TASK(tsk)  \
 138 {                                                                       \
 139         .state          = 0,                                            \
 140         .stack          = &init_thread_info,                            \
 141         .usage          = ATOMIC_INIT(2),                               \
 142         .flags          = PF_KTHREAD,                                   \
 143         .lock_depth     = -1,                                           \
 144         .prio           = MAX_PRIO-20,                                  \
 145         .static_prio    = MAX_PRIO-20,                                  \
 146         .normal_prio    = MAX_PRIO-20,                                  \
 147         .policy         = SCHED_NORMAL,                                 \
 148         .cpus_allowed   = CPU_MASK_ALL,                                 \
 149         .mm             = NULL,                                         \
 150         .active_mm      = &init_mm,                                     \
 151         .se             = {                                             \
 152                 .group_node     = LIST_HEAD_INIT(tsk.se.group_node),    \
 153         },                                                              \
 154         .rt             = {                                             \
 155                 .run_list       = LIST_HEAD_INIT(tsk.rt.run_list),      \
 156                 .time_slice     = HZ,                                   \
 157                 .nr_cpus_allowed = NR_CPUS,                             \
 158         },                                                              \
 159         .tasks          = LIST_HEAD_INIT(tsk.tasks),                    \
 160         .pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO), \
 161         .ptraced        = LIST_HEAD_INIT(tsk.ptraced),                  \
 162         .ptrace_entry   = LIST_HEAD_INIT(tsk.ptrace_entry),             \
 163         .real_parent    = &tsk,                                         \
 164         .parent         = &tsk,                                         \
 165         .children       = LIST_HEAD_INIT(tsk.children),                 \
 166         .sibling        = LIST_HEAD_INIT(tsk.sibling),                  \
 167         .group_leader   = &tsk,                                         \
 168         .real_cred      = &init_cred,                                   \
 169         .cred           = &init_cred,                                   \
 170         .cred_exec_mutex =                                              \
 171                  __MUTEX_INITIALIZER(tsk.cred_exec_mutex),              \
 172         .comm           = "swapper",                                    \
 173         .thread         = INIT_THREAD,                                  \
 174         .fs             = &init_fs,                                     \
 175         .files          = &init_files,                                  \
 176         .signal         = &init_signals,                                \
 177         .sighand        = &init_sighand,                                \
 178         .nsproxy        = &init_nsproxy,                                \
 179         .pending        = {                                             \
 180                 .list = LIST_HEAD_INIT(tsk.pending.list),               \
 181                 .signal = {{0}}},                                       \
 182         .blocked        = {{0}},                                        \
 183         .alloc_lock     = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock),         \
 184         .journal_info   = NULL,                                         \
 185         .cpu_timers     = INIT_CPU_TIMERS(tsk.cpu_timers),              \
 186         .fs_excl        = ATOMIC_INIT(0),                               \
 187         .pi_lock        = __SPIN_LOCK_UNLOCKED(tsk.pi_lock),            \
 188         .timer_slack_ns = 50000, /* 50 usec default slack */            \
 189         .pids = {                                                       \
 190                 [PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),            \
 191                 [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),           \
 192                 [PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),            \
 193         },                                                              \
 194         .dirties = INIT_PROP_LOCAL_SINGLE(dirties),                     \
 195         INIT_IDS                                                        \
 196         INIT_TRACE_IRQFLAGS                                             \
 197         INIT_LOCKDEP                                                    \
 198         INIT_PERF_COUNTERS(tsk)                                         \
 199 }
 200
 201
 202 #define INIT_CPU_TIMERS(cpu_timers)                                     \
 203 {                                                                       \
 204         LIST_HEAD_INIT(cpu_timers[0]),                                  \
 205         LIST_HEAD_INIT(cpu_timers[1]),                                  \
 206         LIST_HEAD_INIT(cpu_timers[2]),                                  \
 207 }
 208
 209
 210 #endif