License cleanup, ifdef namespace cleanup

[lttng-modules.git] / lib / ringbuffer / backend_internal.h

diff --git a/lib/ringbuffer/backend_internal.h b/lib/ringbuffer/backend_internal.h
index d6c1c8239b2ec35af257d9b7376ad45c52a6df89..3e262c2e27f65ca7b8b3ea5ca50fdbb8a7b92824 100644 (file)
--- a/lib/ringbuffer/backend_internal.h
+++ b/lib/ringbuffer/backend_internal.h
@@ -1,20 +1,33 @@
-#ifndef _LINUX_RING_BUFFER_BACKEND_INTERNAL_H
-#define _LINUX_RING_BUFFER_BACKEND_INTERNAL_H
+#ifndef _LIB_RING_BUFFER_BACKEND_INTERNAL_H
+#define _LIB_RING_BUFFER_BACKEND_INTERNAL_H
 
 /*
- * linux/ringbuffer/backend_internal.h
- *
- * Copyright (C) 2008-2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * lib/ringbuffer/backend_internal.h
  *
  * Ring buffer backend (internal helpers).
  *
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright (C) 2008-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "../../wrapper/ringbuffer/config.h"
-#include "../../wrapper//ringbuffer/backend_types.h"
+#include "../../wrapper/ringbuffer/backend_types.h"
 #include "../../wrapper/ringbuffer/frontend_types.h"
 #include <linux/string.h>
+#include <linux/uaccess.h>
 
 /* Ring buffer backend API presented to the frontend */
 
@@ -40,6 +53,12 @@ void lib_ring_buffer_backend_exit(void);
 extern void _lib_ring_buffer_write(struct lib_ring_buffer_backend *bufb,
                                   size_t offset, const void *src, size_t len,
                                   ssize_t pagecpy);
+extern void _lib_ring_buffer_memset(struct lib_ring_buffer_backend *bufb,
+                                   size_t offset, int c, size_t len,
+                                   ssize_t pagecpy);
+extern void _lib_ring_buffer_copy_from_user(struct lib_ring_buffer_backend *bufb,
+                                           size_t offset, const void *src,
+                                           size_t len, ssize_t pagecpy);
 
 /*
  * Subbuffer ID bits for overwrite mode. Need to fit within a single word to be
@@ -414,4 +433,29 @@ do {                                                               \
                inline_memcpy(dest, src, __len);                \
 } while (0)
 
-#endif /* _LINUX_RING_BUFFER_BACKEND_INTERNAL_H */
+/*
+ * We use __copy_from_user to copy userspace data since we already
+ * did the access_ok for the whole range.
+ */
+static inline
+unsigned long lib_ring_buffer_do_copy_from_user(void *dest,
+                                               const void __user *src,
+                                               unsigned long len)
+{
+       return __copy_from_user(dest, src, len);
+}
+
+/*
+ * write len bytes to dest with c
+ */
+static inline
+void lib_ring_buffer_do_memset(char *dest, int c,
+       unsigned long len)
+{
+       unsigned long i;
+
+       for (i = 0; i < len; i++)
+               dest[i] = c;
+}
+
+#endif /* _LIB_RING_BUFFER_BACKEND_INTERNAL_H */