Imported reiserfsprogs-3.6.20

include/misc/unaligned.h

@@ -0,0 +1,40 @@
+/*
+ *  Copyright 2000-2004 by Hans Reiser, licensing governed by 
+ *  reiserfsprogs/README
+ */
+
+#ifndef MISC_UNALIGNED_H
+#define MISC_UNALIGNED_H
+
+#ifdef HAVE_ASM_UNALIGNED_H
+#  include <asm/unaligned.h>
+#endif
+
+#ifndef get_unaligned
+#define get_unaligned(ptr)                              \
+({                                                      \
+        __typeof__(*(ptr)) __tmp;                       \
+        memcpy(&__tmp, (ptr), sizeof(*(ptr)));      \
+        __tmp;                                          \
+})
+#endif
+
+#ifndef put_unaligned
+#define put_unaligned(val, ptr)                         \
+({                                                      \
+        __typeof__(*(ptr)) __tmp = (val);               \
+        memcpy((ptr), &__tmp, sizeof(*(ptr)));      \
+        (void)0;                                        \
+})
+#endif
+
+/* these operate on extent items, where you've got an array of ints
+** at a possibly unaligned location.  These are a noop on ia32
+**
+** p is the array of __u32, i is the index into the array, v is the value
+** to store there.
+*/
+#define d32_get(p, i)	 le32_to_cpu(get_unaligned((__u32 *)(p) + (i)))
+#define d32_put(p, i, v) put_unaligned(cpu_to_le32(v), (__u32 *)(p) + (i))
+
+#endif