Imported reiserfsprogs-3.6.20

2012-10-11 11:32:09 -04:00
1 parent 0ed773997f
commit dac518d099
@@ -0,0 +1,79 @@
+/*
+ * Copyright 1996-2004 by Hans Reiser, licensing governed by 
+ * reiserfsprogs/README
+ */
+
+#ifndef MISC_BITOPS_H
+#define MISC_BITOPS_H
+
+#include "misc/types.h"
+#include "misc/misc.h"
+
+extern __u16 mask16 (int from, int count);
+extern __u32 mask32 (int from, int count);
+extern __u64 mask64 (int from, int count);
+
+#define misc_set_bitfield_XX(XX,vp,val,from,count)				\
+({										\
+    __u##XX * p, tmp;								\
+										\
+    /* make sure that given value can be put in 'count' bits */			\
+    if (val > (1 << count))							\
+	misc_die ("misc_set_bitfield: val %d is too big for %d bits", val, count);	\
+										\
+    p = (__u##XX *)vp;								\
+    tmp = le##XX##_to_cpu (*p);							\
+										\
+    /* clear 'count' bits starting from 'from'-th one */			\
+    tmp &= ~mask##XX (from, count);						\
+										\
+    /* put given value in proper bits */					\
+    tmp |= (val << from);							\
+										\
+    *p = cpu_to_le##XX (tmp);							\
+})
+
+
+#define misc_get_bitfield_XX(XX,vp,from,count)					\
+({										\
+    __u##XX * p, tmp;								\
+										\
+    p = (__u##XX *)vp;								\
+    tmp = le##XX##_to_cpu (*p);							\
+										\
+    /* clear all bits but 'count' bits starting from 'from'-th one */		\
+    tmp &= mask##XX (from, count);						\
+										\
+    /* get value written in specified bits */					\
+    tmp >>= from;								\
+    tmp;									\
+})
+
+extern inline int misc_set_bit (unsigned long long nr, 
+				void * addr);
+
+extern inline int misc_clear_bit (unsigned long long nr, 
+				  void * addr);
+
+extern inline int misc_test_bit(unsigned long long nr, 
+				const void * addr);
+
+extern inline unsigned long long 
+misc_find_first_zero_bit (const void *vaddr, 
+			  unsigned long long size);
+
+extern inline unsigned long long 
+misc_find_next_zero_bit (const void *vaddr, 
+			 unsigned long long size, 
+			 unsigned long long offset);
+
+extern inline unsigned long long 
+misc_find_next_set_bit(const void *vaddr, 
+		       unsigned long long size, 
+		       unsigned long long offset);
+
+extern inline unsigned long long 
+misc_find_first_set_bit (const void *vaddr, 
+			 unsigned long long size);
+
+#endif