dmaengine: make clients responsible for managing channels

[linux-2.6.git] / ipc / util.h

diff --git a/ipc/util.h b/ipc/util.h
index efaff3ee7de7c30b678fa686f88442aaa0aaeac4..e3aa2c5c97dc1f996add0ba9e2827c8cca8d7b28 100644 (file)
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -3,6 +3,8 @@
  * Copyright (C) 1999 Christoph Rohland
  *
  * ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com>
+ * namespaces support.      2006 OpenVZ, SWsoft Inc.
+ *                               Pavel Emelianov <xemul@openvz.org>
  */
 
 #ifndef _IPC_UTIL_H
@@ -15,6 +17,14 @@ void sem_init (void);
 void msg_init (void);
 void shm_init (void);
 
+int sem_init_ns(struct ipc_namespace *ns);
+int msg_init_ns(struct ipc_namespace *ns);
+int shm_init_ns(struct ipc_namespace *ns);
+
+void sem_exit_ns(struct ipc_namespace *ns);
+void msg_exit_ns(struct ipc_namespace *ns);
+void shm_exit_ns(struct ipc_namespace *ns);
+
 struct ipc_id_ary {
        int size;
        struct kern_ipc_perm *p[0];
@@ -25,22 +35,30 @@ struct ipc_ids {
        int max_id;
        unsigned short seq;
        unsigned short seq_max;
-       struct semaphore sem;   
+       struct mutex mutex;
        struct ipc_id_ary nullentry;
        struct ipc_id_ary* entries;
 };
 
 struct seq_file;
-void __init ipc_init_ids(struct ipc_ids* ids, int size);
+#ifdef CONFIG_IPC_NS
+#define __ipc_init
+#else
+#define __ipc_init     __init
+#endif
+void __ipc_init ipc_init_ids(struct ipc_ids *ids, int size);
 #ifdef CONFIG_PROC_FS
 void __init ipc_init_proc_interface(const char *path, const char *header,
-                                   struct ipc_ids *ids,
-                                   int (*show)(struct seq_file *, void *));
+               int ids, int (*show)(struct seq_file *, void *));
 #else
 #define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
 #endif
 
-/* must be called with ids->sem acquired.*/
+#define IPC_SEM_IDS    0
+#define IPC_MSG_IDS    1
+#define IPC_SHM_IDS    2
+
+/* must be called with ids->mutex acquired.*/
 int ipc_findkey(struct ipc_ids* ids, key_t key);
 int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size);
 
@@ -65,6 +83,18 @@ void* ipc_rcu_alloc(int size);
 void ipc_rcu_getref(void *ptr);
 void ipc_rcu_putref(void *ptr);
 
+static inline void __ipc_fini_ids(struct ipc_ids *ids,
+               struct ipc_id_ary *entries)
+{
+       if (entries != &ids->nullentry)
+               ipc_rcu_putref(entries);
+}
+
+static inline void ipc_fini_ids(struct ipc_ids *ids)
+{
+       __ipc_fini_ids(ids, ids->entries);
+}
+
 struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id);
 struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id);
 void ipc_lock_by_ptr(struct kern_ipc_perm *ipcp);