1 files changed, 65 insertions, 0 deletions
diff --git a/serverboot/ffs_compat.c b/serverboot/ffs_compat.c
new file mode 100644
index 00000000..6e322b63
--- /dev/null
+++ b/serverboot/ffs_compat.c
@@ -0,0 +1,65 @@
+/*
+ * BSD FFS like functions used to ease porting bootstrap to Linux ext2 fs
+ * Copyright (C) 1994 Remy Card
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <device/device_types.h>
+#include <device/device.h>
+
+#include <mach/mach_traps.h>
+#include <mach/mach_interface.h>
+
+#include <file_io.h>
+
+#define	EXT2_INODES_PER_BLOCK(s)	(EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_inode))
+
+int ino2blk (struct ext2_super_block *fs, struct ext2_group_desc *gd, int ino)
+{
+        int group;
+        int blk;
+
+        group = (ino - 1) / EXT2_INODES_PER_GROUP(fs);
+        blk = gd[group].bg_inode_table +
+	      (((ino - 1) % EXT2_INODES_PER_GROUP(fs)) /
+               EXT2_INODES_PER_BLOCK(fs));
+        return blk;
+}
+
+int fsbtodb (struct ext2_super_block *fs, int b)
+{
+        return (b * EXT2_BLOCK_SIZE(fs)) / DEV_BSIZE;
+}
+
+int itoo (struct ext2_super_block *fs, int ino)
+{
+	return (ino - 1) % EXT2_INODES_PER_BLOCK(fs);
+}
+
+int blkoff (struct ext2_super_block * fs, vm_offset_t offset)
+{
+	return offset % EXT2_BLOCK_SIZE(fs);
+}
+
+int lblkno (struct ext2_super_block * fs, vm_offset_t offset)
+{
+	return offset / EXT2_BLOCK_SIZE(fs);
+}
+
+int blksize (struct ext2_super_block *fs, struct file *fp, daddr_t file_block)
+{
+	return EXT2_BLOCK_SIZE(fs);	/* XXX - fix for fragments */
+}