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 #if defined(CONFIG_POSIX_MQUEUE) || defined(CONFIG_SYSVIPC)
  66 #define INIT_IPC_NS(ns)         .ns             = &init_ipc_ns,
  67 #else
  68 #define INIT_IPC_NS(ns)
  69 #endif
  70
  71 #ifdef CONFIG_SYSVIPC
  72 extern int register_ipcns_notifier(struct ipc_namespace *);
  73 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
  74 extern void unregister_ipcns_notifier(struct ipc_namespace *);
  75 extern int ipcns_notify(unsigned long);
  76 #else /* CONFIG_SYSVIPC */
  77 static inline int register_ipcns_notifier(struct ipc_namespace *ns)
  78 { return 0; }
  79 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
  80 { return 0; }
  81 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
  82 static inline int ipcns_notify(unsigned long l) { return 0; }
  83 #endif /* CONFIG_SYSVIPC */
  84
  85 #ifdef CONFIG_POSIX_MQUEUE
  86 extern int mq_init_ns(struct ipc_namespace *ns);
  87 /* default values */
  88 #define DFLT_QUEUESMAX 256     /* max number of message queues */
  89 #define DFLT_MSGMAX    10      /* max number of messages in each queue */
  90 #define HARD_MSGMAX    (131072/sizeof(void *))
  91 #define DFLT_MSGSIZEMAX 8192   /* max message size */
  92 #else
  93 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
  94 #endif
  95
  96 #if defined(CONFIG_IPC_NS)
  97 extern void free_ipc_ns(struct ipc_namespace *ns);
  98 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
  99                                        struct ipc_namespace *ns);
 100 extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
 101                       void (*free)(struct ipc_namespace *,
 102                                    struct kern_ipc_perm *));
 103
 104 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
 105 {
 106         if (ns)
 107                 atomic_inc(&ns->count);
 108         return ns;
 109 }
 110
 111 extern void put_ipc_ns(struct ipc_namespace *ns);
 112 #else
 113 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
 114                 struct ipc_namespace *ns)
 115 {
 116         if (flags & CLONE_NEWIPC)
 117                 return ERR_PTR(-EINVAL);
 118
 119         return ns;
 120 }
 121
 122 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
 123 {
 124         return ns;
 125 }
 126
 127 static inline void put_ipc_ns(struct ipc_namespace *ns)
 128 {
 129 }
 130 #endif
 131
 132 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
 133
 134 struct ctl_table_header;
 135 extern struct ctl_table_header *mq_register_sysctl_table(void);
 136
 137 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
 138
 139 static inline struct ctl_table_header *mq_register_sysctl_table(void)
 140 {
 141         return NULL;
 142 }
 143
 144 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
 145 #endif