147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
#ifndef __IPC_NAMESPACE_H__
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#define __IPC_NAMESPACE_H__
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#include <linux/err.h>
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#include <linux/idr.h>
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#include <linux/rwsem.h>
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#include <linux/notifier.h>
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#include <linux/nsproxy.h>
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/*
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* ipc namespace events
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*/
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#define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */
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#define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */
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#define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */
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#define IPCNS_CALLBACK_PRI 0
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struct user_namespace;
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struct ipc_ids {
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int in_use;
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unsigned short seq;
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unsigned short seq_max;
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struct rw_semaphore rw_mutex;
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struct idr ipcs_idr;
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};
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struct ipc_namespace {
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atomic_t count;
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struct ipc_ids ids[3];
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int sem_ctls[4];
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int used_sems;
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int msg_ctlmax;
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int msg_ctlmnb;
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int msg_ctlmni;
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atomic_t msg_bytes;
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atomic_t msg_hdrs;
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int auto_msgmni;
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size_t shm_ctlmax;
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size_t shm_ctlall;
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int shm_ctlmni;
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int shm_tot;
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/*
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* Defines whether IPC_RMID is forced for _all_ shm segments regardless
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* of shmctl()
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*/
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int shm_rmid_forced;
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struct notifier_block ipcns_nb;
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/* The kern_mount of the mqueuefs sb. We take a ref on it */
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struct vfsmount *mq_mnt;
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/* # queues in this ns, protected by mq_lock */
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unsigned int mq_queues_count;
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/* next fields are set through sysctl */
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unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */
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unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */
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unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */
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/* user_ns which owns the ipc ns */
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struct user_namespace *user_ns;
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};
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extern struct ipc_namespace init_ipc_ns;
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extern atomic_t nr_ipc_ns;
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extern spinlock_t mq_lock;
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#ifdef CONFIG_SYSVIPC
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extern int register_ipcns_notifier(struct ipc_namespace *);
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extern int cond_register_ipcns_notifier(struct ipc_namespace *);
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extern void unregister_ipcns_notifier(struct ipc_namespace *);
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extern int ipcns_notify(unsigned long);
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extern void shm_destroy_orphaned(struct ipc_namespace *ns);
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#else /* CONFIG_SYSVIPC */
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static inline int register_ipcns_notifier(struct ipc_namespace *ns)
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{ return 0; }
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static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
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{ return 0; }
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static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
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static inline int ipcns_notify(unsigned long l) { return 0; }
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static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}
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#endif /* CONFIG_SYSVIPC */
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#ifdef CONFIG_POSIX_MQUEUE
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extern int mq_init_ns(struct ipc_namespace *ns);
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/* default values */
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#define DFLT_QUEUESMAX 256 /* max number of message queues */
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#define DFLT_MSGMAX 10 /* max number of messages in each queue */
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#define HARD_MSGMAX (32768*sizeof(void *)/4)
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#define DFLT_MSGSIZEMAX 8192 /* max message size */
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#else
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static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
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#endif
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#if defined(CONFIG_IPC_NS)
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extern struct ipc_namespace *copy_ipcs(unsigned long flags,
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struct task_struct *tsk);
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static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
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{
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if (ns)
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atomic_inc(&ns->count);
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return ns;
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}
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extern void put_ipc_ns(struct ipc_namespace *ns);
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#else
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static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
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struct task_struct *tsk)
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{
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if (flags & CLONE_NEWIPC)
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return ERR_PTR(-EINVAL);
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return tsk->nsproxy->ipc_ns;
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}
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static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
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{
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return ns;
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}
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static inline void put_ipc_ns(struct ipc_namespace *ns)
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{
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}
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#endif
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#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
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struct ctl_table_header;
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extern struct ctl_table_header *mq_register_sysctl_table(void);
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#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
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static inline struct ctl_table_header *mq_register_sysctl_table(void)
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{
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return NULL;
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}
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#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
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#endif
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