1 files changed, 76 insertions, 0 deletions

diff --git a/include/linux/adfs_fs.h b/include/linux/adfs_fs.h
new file mode 100644
index 000000000000..4a5d50c2bdbf
--- /dev/null
+++ b/include/linux/adfs_fs.h
@@ -0,0 +1,76 @@
+#ifndef _ADFS_FS_H
+#define _ADFS_FS_H
+
+#include <linux/types.h>
+
+/*
+ * Disc Record at disc address 0xc00
+ */
+struct adfs_discrecord {
+    __u8  log2secsize;
+    __u8  secspertrack;
+    __u8  heads;
+    __u8  density;
+    __u8  idlen;
+    __u8  log2bpmb;
+    __u8  skew;
+    __u8  bootoption;
+    __u8  lowsector;
+    __u8  nzones;
+    __le16 zone_spare;
+    __le32 root;
+    __le32 disc_size;
+    __le16 disc_id;
+    __u8  disc_name[10];
+    __le32 disc_type;
+    __le32 disc_size_high;
+    __u8  log2sharesize:4;
+    __u8  unused40:4;
+    __u8  big_flag:1;
+    __u8  unused41:1;
+    __u8  nzones_high;
+    __le32 format_version;
+    __le32 root_size;
+    __u8  unused52[60 - 52];
+};
+
+#define ADFS_DISCRECORD         (0xc00)
+#define ADFS_DR_OFFSET          (0x1c0)
+#define ADFS_DR_SIZE             60
+#define ADFS_DR_SIZE_BITS       (ADFS_DR_SIZE << 3)
+#define ADFS_SUPER_MAGIC         0xadf5
+
+#ifdef __KERNEL__
+#include <linux/adfs_fs_i.h>
+#include <linux/adfs_fs_sb.h>
+/*
+ * Calculate the boot block checksum on an ADFS drive.  Note that this will
+ * appear to be correct if the sector contains all zeros, so also check that
+ * the disk size is non-zero!!!
+ */
+static inline int adfs_checkbblk(unsigned char *ptr)
+{
+        unsigned int result = 0;
+        unsigned char *p = ptr + 511;
+
+        do {
+                result = (result & 0xff) + (result >> 8);
+                result = result + *--p;
+        } while (p != ptr);
+
+        return (result & 0xff) != ptr[511];
+}
+
+static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
+{
+        return sb->s_fs_info;
+}
+
+static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
+{
+        return container_of(inode, struct adfs_inode_info, vfs_inode);
+}
+
+#endif
+
+#endif