3 * Copyright (C) 1999 Christoph Rohland
5 * ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com>
6 * namespaces support. 2006 OpenVZ, SWsoft Inc.
7 * Pavel Emelianov <xemul@openvz.org>
13 #include <linux/err.h>
15 #define SEQ_MULTIPLIER (IPCMNI)
23 #ifdef CONFIG_POSIX_MQUEUE
24 extern void mq_clear_sbinfo(struct ipc_namespace
*ns
);
25 extern void mq_put_mnt(struct ipc_namespace
*ns
);
27 static inline void mq_clear_sbinfo(struct ipc_namespace
*ns
) { }
28 static inline void mq_put_mnt(struct ipc_namespace
*ns
) { }
32 void sem_init_ns(struct ipc_namespace
*ns
);
33 void msg_init_ns(struct ipc_namespace
*ns
);
34 void shm_init_ns(struct ipc_namespace
*ns
);
36 void sem_exit_ns(struct ipc_namespace
*ns
);
37 void msg_exit_ns(struct ipc_namespace
*ns
);
38 void shm_exit_ns(struct ipc_namespace
*ns
);
40 static inline void sem_init_ns(struct ipc_namespace
*ns
) { }
41 static inline void msg_init_ns(struct ipc_namespace
*ns
) { }
42 static inline void shm_init_ns(struct ipc_namespace
*ns
) { }
44 static inline void sem_exit_ns(struct ipc_namespace
*ns
) { }
45 static inline void msg_exit_ns(struct ipc_namespace
*ns
) { }
46 static inline void shm_exit_ns(struct ipc_namespace
*ns
) { }
50 * Structure that holds the parameters needed by the ipc operations
57 size_t size
; /* for shared memories */
58 int nsems
; /* for semaphores */
59 } u
; /* holds the getnew() specific param */
63 * Structure that holds some ipc operations. This structure is used to unify
64 * the calls to sys_msgget(), sys_semget(), sys_shmget()
65 * . routine to call to create a new ipc object. Can be one of newque,
67 * . routine to call to check permissions for a new ipc object.
68 * Can be one of security_msg_associate, security_sem_associate,
69 * security_shm_associate
70 * . routine to call for an extra check if needed
73 int (*getnew
) (struct ipc_namespace
*, struct ipc_params
*);
74 int (*associate
) (struct kern_ipc_perm
*, int);
75 int (*more_checks
) (struct kern_ipc_perm
*, struct ipc_params
*);
81 void ipc_init_ids(struct ipc_ids
*);
83 void __init
ipc_init_proc_interface(const char *path
, const char *header
,
84 int ids
, int (*show
)(struct seq_file
*, void *));
86 #define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
93 #define ipcid_to_idx(id) ((id) % SEQ_MULTIPLIER)
95 /* must be called with ids->rw_mutex acquired for writing */
96 int ipc_addid(struct ipc_ids
*, struct kern_ipc_perm
*, int);
98 /* must be called with ids->rw_mutex acquired for reading */
99 int ipc_get_maxid(struct ipc_ids
*);
101 /* must be called with both locks acquired. */
102 void ipc_rmid(struct ipc_ids
*, struct kern_ipc_perm
*);
104 /* must be called with ipcp locked */
105 int ipcperms(struct kern_ipc_perm
*ipcp
, short flg
);
107 /* for rare, potentially huge allocations.
108 * both function can sleep
110 void* ipc_alloc(int size
);
111 void ipc_free(void* ptr
, int size
);
114 * For allocation that need to be freed by RCU.
115 * Objects are reference counted, they start with reference count 1.
116 * getref increases the refcount, the putref call that reduces the recount
117 * to 0 schedules the rcu destruction. Caller must guarantee locking.
119 void* ipc_rcu_alloc(int size
);
120 void ipc_rcu_getref(void *ptr
);
121 void ipc_rcu_putref(void *ptr
);
123 struct kern_ipc_perm
*ipc_lock(struct ipc_ids
*, int);
125 void kernel_to_ipc64_perm(struct kern_ipc_perm
*in
, struct ipc64_perm
*out
);
126 void ipc64_perm_to_ipc_perm(struct ipc64_perm
*in
, struct ipc_perm
*out
);
127 void ipc_update_perm(struct ipc64_perm
*in
, struct kern_ipc_perm
*out
);
128 struct kern_ipc_perm
*ipcctl_pre_down(struct ipc_ids
*ids
, int id
, int cmd
,
129 struct ipc64_perm
*perm
, int extra_perm
);
131 #if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) || defined(__XTENSA__)
132 /* On IA-64, we always use the "64-bit version" of the IPC structures. */
133 # define ipc_parse_version(cmd) IPC_64
135 int ipc_parse_version (int *cmd
);
138 extern void free_msg(struct msg_msg
*msg
);
139 extern struct msg_msg
*load_msg(const void __user
*src
, int len
);
140 extern int store_msg(void __user
*dest
, struct msg_msg
*msg
, int len
);
142 extern void recompute_msgmni(struct ipc_namespace
*);
144 static inline int ipc_buildid(int id
, int seq
)
146 return SEQ_MULTIPLIER
* seq
+ id
;
150 * Must be called with ipcp locked
152 static inline int ipc_checkid(struct kern_ipc_perm
*ipcp
, int uid
)
154 if (uid
/ SEQ_MULTIPLIER
!= ipcp
->seq
)
159 static inline void ipc_lock_by_ptr(struct kern_ipc_perm
*perm
)
162 spin_lock(&perm
->lock
);
165 static inline void ipc_unlock(struct kern_ipc_perm
*perm
)
167 spin_unlock(&perm
->lock
);
171 struct kern_ipc_perm
*ipc_lock_check(struct ipc_ids
*ids
, int id
);
172 int ipcget(struct ipc_namespace
*ns
, struct ipc_ids
*ids
,
173 struct ipc_ops
*ops
, struct ipc_params
*params
);
This page took 0.033824 seconds and 6 git commands to generate.