include/linux/ipc_namespace.h

   1 #ifndef __IPC_NAMESPACE_H__
   2 #define __IPC_NAMESPACE_H__
   3
   4 #include <linux/err.h>
   5 #include <linux/idr.h>
   6 #include <linux/rwsem.h>
   7 #include <linux/notifier.h>
   8
   9 /*
  10  * ipc namespace events
  11  */
  12 #define IPCNS_MEMCHANGED   0x00000001   /* Notify lowmem size changed */
  13 #define IPCNS_CREATED  0x00000002   /* Notify new ipc namespace created */
  14 #define IPCNS_REMOVED  0x00000003   /* Notify ipc namespace removed */
  15
  16 #define IPCNS_CALLBACK_PRI 0
  17
  18
  19 struct ipc_ids {
  20         int in_use;
  21         unsigned short seq;
  22         unsigned short seq_max;
  23         struct rw_semaphore rw_mutex;
  24         struct idr ipcs_idr;
  25 };
  26
  27 struct ipc_namespace {
  28         atomic_t        count;
  29         struct ipc_ids  ids[3];
  30
  31         int             sem_ctls[4];
  32         int             used_sems;
  33
  34         int             msg_ctlmax;
  35         int             msg_ctlmnb;
  36         int             msg_ctlmni;
  37         atomic_t        msg_bytes;
  38         atomic_t        msg_hdrs;
  39         int             auto_msgmni;
  40
  41         size_t          shm_ctlmax;
  42         size_t          shm_ctlall;
  43         int             shm_ctlmni;
  44         int             shm_tot;
  45
  46         struct notifier_block ipcns_nb;
  47
  48         /* The kern_mount of the mqueuefs sb.  We take a ref on it */
  49         struct vfsmount *mq_mnt;
  50
  51         /* # queues in this ns, protected by mq_lock */
  52         unsigned int    mq_queues_count;
  53
  54         /* next fields are set through sysctl */
  55         unsigned int    mq_queues_max;   /* initialized to DFLT_QUEUESMAX */
  56         unsigned int    mq_msg_max;      /* initialized to DFLT_MSGMAX */
  57         unsigned int    mq_msgsize_max;  /* initialized to DFLT_MSGSIZEMAX */
  58
  59 };
  60
  61 extern struct ipc_namespace init_ipc_ns;
  62 extern atomic_t nr_ipc_ns;
  63
  64 extern spinlock_t mq_lock;
  65
  66 #ifdef CONFIG_SYSVIPC
  67 extern int register_ipcns_notifier(struct ipc_namespace *);
  68 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
  69 extern void unregister_ipcns_notifier(struct ipc_namespace *);
  70 extern int ipcns_notify(unsigned long);
  71 #else /* CONFIG_SYSVIPC */
  72 static inline int register_ipcns_notifier(struct ipc_namespace *ns)
  73 { return 0; }
  74 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
  75 { return 0; }
  76 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
  77 static inline int ipcns_notify(unsigned long l) { return 0; }
  78 #endif /* CONFIG_SYSVIPC */
  79
  80 #ifdef CONFIG_POSIX_MQUEUE
  81 extern int mq_init_ns(struct ipc_namespace *ns);
  82 /* default values */
  83 #define DFLT_QUEUESMAX 256     /* max number of message queues */
  84 #define DFLT_MSGMAX    10      /* max number of messages in each queue */
  85 #define HARD_MSGMAX    (32768*sizeof(void *)/4)
  86 #define DFLT_MSGSIZEMAX 8192   /* max message size */
  87 #else
  88 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
  89 #endif
  90
  91 #if defined(CONFIG_IPC_NS)
  92 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
  93                                        struct ipc_namespace *ns);
  94 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
  95 {
  96         if (ns)
  97                 atomic_inc(&ns->count);
  98         return ns;
  99 }
 100
 101 extern void put_ipc_ns(struct ipc_namespace *ns);
 102 #else
 103 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
 104                 struct ipc_namespace *ns)
 105 {
 106         if (flags & CLONE_NEWIPC)
 107                 return ERR_PTR(-EINVAL);
 108
 109         return ns;
 110 }
 111
 112 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
 113 {
 114         return ns;
 115 }
 116
 117 static inline void put_ipc_ns(struct ipc_namespace *ns)
 118 {
 119 }
 120 #endif
 121
 122 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
 123
 124 struct ctl_table_header;
 125 extern struct ctl_table_header *mq_register_sysctl_table(void);
 126
 127 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
 128
 129 static inline struct ctl_table_header *mq_register_sysctl_table(void)
 130 {
 131         return NULL;
 132 }
 133
 134 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
 135 #endif