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 struct user_namespace;
  19
  20 struct ipc_ids {
  21         int in_use;
  22         unsigned short seq;
  23         unsigned short seq_max;
  24         struct rw_semaphore rw_mutex;
  25         struct idr ipcs_idr;
  26 };
  27
  28 struct ipc_namespace {
  29         atomic_t        count;
  30         struct ipc_ids  ids[3];
  31
  32         int             sem_ctls[4];
  33         int             used_sems;
  34
  35         int             msg_ctlmax;
  36         int             msg_ctlmnb;
  37         int             msg_ctlmni;
  38         atomic_t        msg_bytes;
  39         atomic_t        msg_hdrs;
  40         int             auto_msgmni;
  41
  42         size_t          shm_ctlmax;
  43         size_t          shm_ctlall;
  44         int             shm_ctlmni;
  45         int             shm_tot;
  46
  47         struct notifier_block ipcns_nb;
  48
  49         /* The kern_mount of the mqueuefs sb.  We take a ref on it */
  50         struct vfsmount *mq_mnt;
  51
  52         /* # queues in this ns, protected by mq_lock */
  53         unsigned int    mq_queues_count;
  54
  55         /* next fields are set through sysctl */
  56         unsigned int    mq_queues_max;   /* initialized to DFLT_QUEUESMAX */
  57         unsigned int    mq_msg_max;      /* initialized to DFLT_MSGMAX */
  58         unsigned int    mq_msgsize_max;  /* initialized to DFLT_MSGSIZEMAX */
  59
  60         /* user_ns which owns the ipc ns */
  61         struct user_namespace *user_ns;
  62 };
  63
  64 extern struct ipc_namespace init_ipc_ns;
  65 extern atomic_t nr_ipc_ns;
  66
  67 extern spinlock_t mq_lock;
  68
  69 #ifdef CONFIG_SYSVIPC
  70 extern int register_ipcns_notifier(struct ipc_namespace *);
  71 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
  72 extern void unregister_ipcns_notifier(struct ipc_namespace *);
  73 extern int ipcns_notify(unsigned long);
  74 #else /* CONFIG_SYSVIPC */
  75 static inline int register_ipcns_notifier(struct ipc_namespace *ns)
  76 { return 0; }
  77 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
  78 { return 0; }
  79 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
  80 static inline int ipcns_notify(unsigned long l) { return 0; }
  81 #endif /* CONFIG_SYSVIPC */
  82
  83 #ifdef CONFIG_POSIX_MQUEUE
  84 extern int mq_init_ns(struct ipc_namespace *ns);
  85 /* default values */
  86 #define DFLT_QUEUESMAX 256     /* max number of message queues */
  87 #define DFLT_MSGMAX    10      /* max number of messages in each queue */
  88 #define HARD_MSGMAX    (32768*sizeof(void *)/4)
  89 #define DFLT_MSGSIZEMAX 8192   /* max message size */
  90 #else
  91 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
  92 #endif
  93
  94 #if defined(CONFIG_IPC_NS)
  95 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
  96                                        struct ipc_namespace *ns);
  97 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
  98 {
  99         if (ns)
 100                 atomic_inc(&ns->count);
 101         return ns;
 102 }
 103
 104 extern void put_ipc_ns(struct ipc_namespace *ns);
 105 #else
 106 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
 107                 struct ipc_namespace *ns)
 108 {
 109         if (flags & CLONE_NEWIPC)
 110                 return ERR_PTR(-EINVAL);
 111
 112         return ns;
 113 }
 114
 115 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
 116 {
 117         return ns;
 118 }
 119
 120 static inline void put_ipc_ns(struct ipc_namespace *ns)
 121 {
 122 }
 123 #endif
 124
 125 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
 126
 127 struct ctl_table_header;
 128 extern struct ctl_table_header *mq_register_sysctl_table(void);
 129
 130 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
 131
 132 static inline struct ctl_table_header *mq_register_sysctl_table(void)
 133 {
 134         return NULL;
 135 }
 136
 137 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
 138 #endif