init_task.h revision 6976675d94042fbd446231d1bd8b7de71a980ada 
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
14extern struct files_struct init_files;
15
16#define INIT_KIOCTX(name, which_mm) \
17{							\
18	.users		= ATOMIC_INIT(1),		\
19	.dead		= 0,				\
20	.mm		= &which_mm,			\
21	.user_id	= 0,				\
22	.next		= NULL,				\
23	.wait		= __WAIT_QUEUE_HEAD_INITIALIZER(name.wait), \
24	.ctx_lock	= __SPIN_LOCK_UNLOCKED(name.ctx_lock), \
25	.reqs_active	= 0U,				\
26	.max_reqs	= ~0U,				\
27}
28
29#define INIT_MM(name) \
30{			 					\
31	.mm_rb		= RB_ROOT,				\
32	.pgd		= swapper_pg_dir, 			\
33	.mm_users	= ATOMIC_INIT(2), 			\
34	.mm_count	= ATOMIC_INIT(1), 			\
35	.mmap_sem	= __RWSEM_INITIALIZER(name.mmap_sem),	\
36	.page_table_lock =  __SPIN_LOCK_UNLOCKED(name.page_table_lock),	\
37	.mmlist		= LIST_HEAD_INIT(name.mmlist),		\
38	.cpu_vm_mask	= CPU_MASK_ALL,				\
39}
40
41#define INIT_SIGNALS(sig) {						\
42	.count		= ATOMIC_INIT(1), 				\
43	.wait_chldexit	= __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
44	.shared_pending	= { 						\
45		.list = LIST_HEAD_INIT(sig.shared_pending.list),	\
46		.signal =  {{0}}},					\
47	.posix_timers	 = LIST_HEAD_INIT(sig.posix_timers),		\
48	.cpu_timers	= INIT_CPU_TIMERS(sig.cpu_timers),		\
49	.rlim		= INIT_RLIMITS,					\
50}
51
52extern struct nsproxy init_nsproxy;
53#define INIT_NSPROXY(nsproxy) {						\
54	.pid_ns		= &init_pid_ns,					\
55	.count		= ATOMIC_INIT(1),				\
56	.uts_ns		= &init_uts_ns,					\
57	.mnt_ns		= NULL,						\
58	INIT_NET_NS(net_ns)                                             \
59	INIT_IPC_NS(ipc_ns)						\
60	.user_ns	= &init_user_ns,				\
61}
62
63#define INIT_SIGHAND(sighand) {						\
64	.count		= ATOMIC_INIT(1), 				\
65	.action		= { { { .sa_handler = NULL, } }, },		\
66	.siglock	= __SPIN_LOCK_UNLOCKED(sighand.siglock),	\
67	.signalfd_wqh	= __WAIT_QUEUE_HEAD_INITIALIZER(sighand.signalfd_wqh),	\
68}
69
70extern struct group_info init_groups;
71
72#define INIT_STRUCT_PID {						\
73	.count 		= ATOMIC_INIT(1),				\
74	.tasks		= {						\
75		{ .first = &init_task.pids[PIDTYPE_PID].node },		\
76		{ .first = &init_task.pids[PIDTYPE_PGID].node },	\
77		{ .first = &init_task.pids[PIDTYPE_SID].node },		\
78	},								\
79	.rcu		= RCU_HEAD_INIT,				\
80	.level		= 0,						\
81	.numbers	= { {						\
82		.nr		= 0,					\
83		.ns		= &init_pid_ns,				\
84		.pid_chain	= { .next = NULL, .pprev = NULL },	\
85	}, }								\
86}
87
88#define INIT_PID_LINK(type) 					\
89{								\
90	.node = {						\
91		.next = NULL,					\
92		.pprev = &init_struct_pid.tasks[type].first,	\
93	},							\
94	.pid = &init_struct_pid,				\
95}
96
97#ifdef CONFIG_AUDITSYSCALL
98#define INIT_IDS \
99	.loginuid = -1, \
100	.sessionid = -1,
101#else
102#define INIT_IDS
103#endif
104
105#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
106/*
107 * Because of the reduced scope of CAP_SETPCAP when filesystem
108 * capabilities are in effect, it is safe to allow CAP_SETPCAP to
109 * be available in the default configuration.
110 */
111# define CAP_INIT_BSET  CAP_FULL_SET
112#else
113# define CAP_INIT_BSET  CAP_INIT_EFF_SET
114#endif
115
116/*
117 *  INIT_TASK is used to set up the first task table, touch at
118 * your own risk!. Base=0, limit=0x1fffff (=2MB)
119 */
120#define INIT_TASK(tsk)	\
121{									\
122	.state		= 0,						\
123	.stack		= &init_thread_info,				\
124	.usage		= ATOMIC_INIT(2),				\
125	.flags		= PF_KTHREAD,					\
126	.lock_depth	= -1,						\
127	.prio		= MAX_PRIO-20,					\
128	.static_prio	= MAX_PRIO-20,					\
129	.normal_prio	= MAX_PRIO-20,					\
130	.policy		= SCHED_NORMAL,					\
131	.cpus_allowed	= CPU_MASK_ALL,					\
132	.mm		= NULL,						\
133	.active_mm	= &init_mm,					\
134	.se		= {						\
135		.group_node 	= LIST_HEAD_INIT(tsk.se.group_node),	\
136	},								\
137	.rt		= {						\
138		.run_list	= LIST_HEAD_INIT(tsk.rt.run_list),	\
139		.time_slice	= HZ, 					\
140		.nr_cpus_allowed = NR_CPUS,				\
141	},								\
142	.tasks		= LIST_HEAD_INIT(tsk.tasks),			\
143	.ptraced	= LIST_HEAD_INIT(tsk.ptraced),			\
144	.ptrace_entry	= LIST_HEAD_INIT(tsk.ptrace_entry),		\
145	.real_parent	= &tsk,						\
146	.parent		= &tsk,						\
147	.children	= LIST_HEAD_INIT(tsk.children),			\
148	.sibling	= LIST_HEAD_INIT(tsk.sibling),			\
149	.group_leader	= &tsk,						\
150	.group_info	= &init_groups,					\
151	.cap_effective	= CAP_INIT_EFF_SET,				\
152	.cap_inheritable = CAP_INIT_INH_SET,				\
153	.cap_permitted	= CAP_FULL_SET,					\
154	.cap_bset 	= CAP_INIT_BSET,				\
155	.securebits     = SECUREBITS_DEFAULT,				\
156	.user		= INIT_USER,					\
157	.comm		= "swapper",					\
158	.thread		= INIT_THREAD,					\
159	.fs		= &init_fs,					\
160	.files		= &init_files,					\
161	.signal		= &init_signals,				\
162	.sighand	= &init_sighand,				\
163	.nsproxy	= &init_nsproxy,				\
164	.pending	= {						\
165		.list = LIST_HEAD_INIT(tsk.pending.list),		\
166		.signal = {{0}}},					\
167	.blocked	= {{0}},					\
168	.alloc_lock	= __SPIN_LOCK_UNLOCKED(tsk.alloc_lock),		\
169	.journal_info	= NULL,						\
170	.cpu_timers	= INIT_CPU_TIMERS(tsk.cpu_timers),		\
171	.fs_excl	= ATOMIC_INIT(0),				\
172	.pi_lock	= __SPIN_LOCK_UNLOCKED(tsk.pi_lock),		\
173	.timer_slack_ns = 50000, /* 50 usec default slack */		\
174	.pids = {							\
175		[PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),		\
176		[PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),		\
177		[PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),		\
178	},								\
179	.dirties = INIT_PROP_LOCAL_SINGLE(dirties),			\
180	INIT_IDS							\
181	INIT_TRACE_IRQFLAGS						\
182	INIT_LOCKDEP							\
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
194#endif
195