1 files changed, 213 insertions, 0 deletions
diff --git a/fs/xfs/xfs_arch.h b/fs/xfs/xfs_arch.h
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+/*
+ * Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+#ifndef __XFS_ARCH_H__
+#define __XFS_ARCH_H__
+
+#ifndef XFS_BIG_INUMS
+# error XFS_BIG_INUMS must be defined true or false
+#endif
+
+#ifdef __KERNEL__
+
+#include <asm/byteorder.h>
+
+#ifdef __LITTLE_ENDIAN
+# define __BYTE_ORDER	__LITTLE_ENDIAN
+#endif
+#ifdef __BIG_ENDIAN
+# define __BYTE_ORDER	__BIG_ENDIAN
+#endif
+
+#endif	/* __KERNEL__ */
+
+/* do we need conversion? */
+
+#define ARCH_NOCONVERT 1
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+# define ARCH_CONVERT	0
+#else
+# define ARCH_CONVERT	ARCH_NOCONVERT
+#endif
+
+/* generic swapping macros */
+
+#ifndef HAVE_SWABMACROS
+#define INT_SWAP16(type,var) ((typeof(type))(__swab16((__u16)(var))))
+#define INT_SWAP32(type,var) ((typeof(type))(__swab32((__u32)(var))))
+#define INT_SWAP64(type,var) ((typeof(type))(__swab64((__u64)(var))))
+#endif
+
+#define INT_SWAP(type, var) \
+    ((sizeof(type) == 8) ? INT_SWAP64(type,var) : \
+    ((sizeof(type) == 4) ? INT_SWAP32(type,var) : \
+    ((sizeof(type) == 2) ? INT_SWAP16(type,var) : \
+    (var))))
+
+/*
+ * get and set integers from potentially unaligned locations
+ */
+
+#define INT_GET_UNALIGNED_16_BE(pointer) \
+   ((__u16)((((__u8*)(pointer))[0] << 8) | (((__u8*)(pointer))[1])))
+#define INT_SET_UNALIGNED_16_BE(pointer,value) \
+    { \
+	((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \
+	((__u8*)(pointer))[1] = (((value)     ) & 0xff); \
+    }
+
+/* define generic INT_ macros */
+
+#define INT_GET(reference,arch) \
+    (((arch) == ARCH_NOCONVERT) \
+	? \
+	    (reference) \
+	: \
+	    INT_SWAP((reference),(reference)) \
+    )
+
+/* does not return a value */
+#define INT_SET(reference,arch,valueref) \
+    (__builtin_constant_p(valueref) ? \
+	(void)( (reference) = ( ((arch) != ARCH_NOCONVERT) ? (INT_SWAP((reference),(valueref))) : (valueref)) ) : \
+	(void)( \
+	    ((reference) = (valueref)), \
+	    ( ((arch) != ARCH_NOCONVERT) ? (reference) = INT_SWAP((reference),(reference)) : 0 ) \
+	) \
+    )
+
+/* does not return a value */
+#define INT_MOD_EXPR(reference,arch,code) \
+    (((arch) == ARCH_NOCONVERT) \
+	? \
+	    (void)((reference) code) \
+	: \
+	    (void)( \
+		(reference) = INT_GET((reference),arch) , \
+		((reference) code), \
+		INT_SET(reference, arch, reference) \
+	    ) \
+    )
+
+/* does not return a value */
+#define INT_MOD(reference,arch,delta) \
+    (void)( \
+	INT_MOD_EXPR(reference,arch,+=(delta)) \
+    )
+
+/*
+ * INT_COPY - copy a value between two locations with the
+ *	      _same architecture_ but _potentially different sizes_
+ *
+ *	    if the types of the two parameters are equal or they are
+ *		in native architecture, a simple copy is done
+ *
+ *	    otherwise, architecture conversions are done
+ *
+ */
+
+/* does not return a value */
+#define INT_COPY(dst,src,arch) \
+    ( \
+	((sizeof(dst) == sizeof(src)) || ((arch) == ARCH_NOCONVERT)) \
+	    ? \
+		(void)((dst) = (src)) \
+	    : \
+		INT_SET(dst, arch, INT_GET(src, arch)) \
+    )
+
+/*
+ * INT_XLATE - copy a value in either direction between two locations
+ *	       with different architectures
+ *
+ *		    dir < 0	- copy from memory to buffer (native to arch)
+ *		    dir > 0	- copy from buffer to memory (arch to native)
+ */
+
+/* does not return a value */
+#define INT_XLATE(buf,mem,dir,arch) {\
+    ASSERT(dir); \
+    if (dir>0) { \
+	(mem)=INT_GET(buf, arch); \
+    } else { \
+	INT_SET(buf, arch, mem); \
+    } \
+}
+
+/*
+ * In directories inode numbers are stored as unaligned arrays of unsigned
+ * 8bit integers on disk.
+ *
+ * For v1 directories or v2 directories that contain inode numbers that
+ * do not fit into 32bit the array has eight members, but the first member
+ * is always zero:
+ *
+ *  |unused|48-55|40-47|32-39|24-31|16-23| 8-15| 0- 7|
+ *
+ * For v2 directories that only contain entries with inode numbers that fit
+ * into 32bits a four-member array is used:
+ *
+ *  |24-31|16-23| 8-15| 0- 7|
+ */ 
+
+#define XFS_GET_DIR_INO4(di) \
+	(((u32)(di).i[0] << 24) | ((di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
+
+#define XFS_PUT_DIR_INO4(from, di) \
+do { \
+	(di).i[0] = (((from) & 0xff000000ULL) >> 24); \
+	(di).i[1] = (((from) & 0x00ff0000ULL) >> 16); \
+	(di).i[2] = (((from) & 0x0000ff00ULL) >> 8); \
+	(di).i[3] = ((from) & 0x000000ffULL); \
+} while (0)
+
+#define XFS_DI_HI(di) \
+	(((u32)(di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
+#define XFS_DI_LO(di) \
+	(((u32)(di).i[4] << 24) | ((di).i[5] << 16) | ((di).i[6] << 8) | ((di).i[7]))
+
+#define XFS_GET_DIR_INO8(di)        \
+	(((xfs_ino_t)XFS_DI_LO(di) & 0xffffffffULL) | \
+	 ((xfs_ino_t)XFS_DI_HI(di) << 32))
+
+#define XFS_PUT_DIR_INO8(from, di) \
+do { \
+	(di).i[0] = 0; \
+	(di).i[1] = (((from) & 0x00ff000000000000ULL) >> 48); \
+	(di).i[2] = (((from) & 0x0000ff0000000000ULL) >> 40); \
+	(di).i[3] = (((from) & 0x000000ff00000000ULL) >> 32); \
+	(di).i[4] = (((from) & 0x00000000ff000000ULL) >> 24); \
+	(di).i[5] = (((from) & 0x0000000000ff0000ULL) >> 16); \
+	(di).i[6] = (((from) & 0x000000000000ff00ULL) >> 8); \
+	(di).i[7] = ((from) & 0x00000000000000ffULL); \
+} while (0)
+	
+#endif	/* __XFS_ARCH_H__ */