patch-2.1.71 linux/fs/ufs/ufs_swab.h

• Lines: 60
• Date: Wed Dec 3 06:18:33 1997
• Orig file: v2.1.70/linux/fs/ufs/ufs_swab.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.70/linux/fs/ufs/ufs_swab.h linux/fs/ufs/ufs_swab.h
@@ -0,0 +1,59 @@
+/*
+ *  linux/fs/ufs/ufs_swab.h
+ *
+ * Copyright (C) 1997 
+ * Francois-Rene Rideau <rideau@ens.fr>
+ *
+ */
+
+#ifndef _UFS_SWAB_H
+#define _UFS_SWAB_H
+
+
+/*
+ * Notes:
+ * (1) HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes
+ *    in case there are ufs implementations that have strange bytesexes,
+ *    you'll need to modify code here as well as in ufs_super.c and ufs_fs.h
+ *    to support them.
+ * (2) for a read/write ufs driver, we should distinguish
+ *    between byteswapping for read or write accesses!
+ */
+
+#include <linux/ufs_fs.h>
+#include <asm/byteorder.h>
+
+/*
+ * These are only valid inside ufs routines,
+ * after bytesex has been initialized to sb->u.ufs_sb.s_flags&UFS_BYTESEX
+ */
+#define SWAB16(x) ufs_swab16(bytesex,x)
+#define SWAB32(x) ufs_swab32(bytesex,x)
+#define SWAB64(x) ufs_swab64(bytesex,x)
+
+extern __inline__ __const__ __u16 ufs_swab16(__u32 bytesex, __u16 x) {
+	if (bytesex == UFS_LITTLE_ENDIAN) {
+		return le16_to_cpu(x);
+	} else {
+		return be16_to_cpu(x);
+	}
+}
+extern __inline__ __const__ __u32 ufs_swab32(__u32 bytesex, __u32 x) {
+	if (bytesex == UFS_LITTLE_ENDIAN) {
+		return le32_to_cpu(x);
+	} else {
+		return be32_to_cpu(x);
+	}
+}
+extern __inline__ __const__ __u64 ufs_swab64(__u32 bytesex, __u64 x) {
+	if (bytesex == UFS_LITTLE_ENDIAN) {
+		return le64_to_cpu(x);
+	} else {
+		return be64_to_cpu(x);
+	}
+}
+
+extern void ufs_superblock_le_to_cpus(struct ufs_superblock * usb);
+extern void ufs_superblock_be_to_cpus(struct ufs_superblock * usb);
+
+#endif /* _UFS_SWAB_H */