include/linux/adfs_fs.h

   1 #ifndef _ADFS_FS_H
   2 #define _ADFS_FS_H
   3
   4 #include <linux/types.h>
   5
   6 /*
   7  * Disc Record at disc address 0xc00
   8  */
   9 struct adfs_discrecord {
  10     __u8  log2secsize;
  11     __u8  secspertrack;
  12     __u8  heads;
  13     __u8  density;
  14     __u8  idlen;
  15     __u8  log2bpmb;
  16     __u8  skew;
  17     __u8  bootoption;
  18     __u8  lowsector;
  19     __u8  nzones;
  20     __le16 zone_spare;
  21     __le32 root;
  22     __le32 disc_size;
  23     __le16 disc_id;
  24     __u8  disc_name[10];
  25     __le32 disc_type;
  26     __le32 disc_size_high;
  27     __u8  log2sharesize:4;
  28     __u8  unused40:4;
  29     __u8  big_flag:1;
  30     __u8  unused41:1;
  31     __u8  nzones_high;
  32     __le32 format_version;
  33     __le32 root_size;
  34     __u8  unused52[60 - 52];
  35 };
  36
  37 #define ADFS_DISCRECORD         (0xc00)
  38 #define ADFS_DR_OFFSET          (0x1c0)
  39 #define ADFS_DR_SIZE             60
  40 #define ADFS_DR_SIZE_BITS       (ADFS_DR_SIZE << 3)
  41 #define ADFS_SUPER_MAGIC         0xadf5
  42
  43 #ifdef __KERNEL__
  44 #include <linux/adfs_fs_i.h>
  45 #include <linux/adfs_fs_sb.h>
  46 /*
  47  * Calculate the boot block checksum on an ADFS drive.  Note that this will
  48  * appear to be correct if the sector contains all zeros, so also check that
  49  * the disk size is non-zero!!!
  50  */
  51 static inline int adfs_checkbblk(unsigned char *ptr)
  52 {
  53         unsigned int result = 0;
  54         unsigned char *p = ptr + 511;
  55
  56         do {
  57                 result = (result & 0xff) + (result >> 8);
  58                 result = result + *--p;
  59         } while (p != ptr);
  60
  61         return (result & 0xff) != ptr[511];
  62 }
  63
  64 static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
  65 {
  66         return sb->s_fs_info;
  67 }
  68
  69 static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
  70 {
  71         return container_of(inode, struct adfs_inode_info, vfs_inode);
  72 }
  73
  74 #endif
  75
  76 #endif