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         struct kref     kref;
  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
  49 extern struct ipc_namespace init_ipc_ns;
  50 extern atomic_t nr_ipc_ns;
  51
  52 #ifdef CONFIG_SYSVIPC
  53 #define INIT_IPC_NS(ns)         .ns             = &init_ipc_ns,
  54
  55 extern int register_ipcns_notifier(struct ipc_namespace *);
  56 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
  57 extern void unregister_ipcns_notifier(struct ipc_namespace *);
  58 extern int ipcns_notify(unsigned long);
  59
  60 #else /* CONFIG_SYSVIPC */
  61 #define INIT_IPC_NS(ns)
  62 #endif /* CONFIG_SYSVIPC */
  63
  64 #if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS)
  65 extern void free_ipc_ns(struct kref *kref);
  66 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
  67                                        struct ipc_namespace *ns);
  68 extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
  69                       void (*free)(struct ipc_namespace *,
  70                                    struct kern_ipc_perm *));
  71
  72 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
  73 {
  74         if (ns)
  75                 kref_get(&ns->kref);
  76         return ns;
  77 }
  78
  79 static inline void put_ipc_ns(struct ipc_namespace *ns)
  80 {
  81         kref_put(&ns->kref, free_ipc_ns);
  82 }
  83 #else
  84 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
  85                 struct ipc_namespace *ns)
  86 {
  87         if (flags & CLONE_NEWIPC)
  88                 return ERR_PTR(-EINVAL);
  89
  90         return ns;
  91 }
  92
  93 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
  94 {
  95         return ns;
  96 }
  97
  98 static inline void put_ipc_ns(struct ipc_namespace *ns)
  99 {
 100 }
 101 #endif
 102 #endif