include/linux/adfs_fs.h

   1 #ifndef _ADFS_FS_H
   2 #define _ADFS_FS_H
   3
   4 #include <linux/types.h>
   5 /*
   6  * Structures of data on the disk
   7  */
   8
   9 /*
  10  * Disc Record at disc address 0xc00
  11  */
  12 struct adfs_discrecord {
  13     unsigned char  log2secsize;
  14     unsigned char  secspertrack;
  15     unsigned char  heads;
  16     unsigned char  density;
  17     unsigned char  idlen;
  18     unsigned char  log2bpmb;
  19     unsigned char  skew;
  20     unsigned char  bootoption;
  21     unsigned char  lowsector;
  22     unsigned char  nzones;
  23     unsigned short zone_spare;
  24     unsigned long  root;
  25     unsigned long  disc_size;
  26     unsigned short disc_id;
  27     unsigned char  disc_name[10];
  28     unsigned long  disc_type;
  29     unsigned long  disc_size_high;
  30     unsigned char  log2sharesize:4;
  31     unsigned char  unused:4;
  32     unsigned char  big_flag:1;
  33 };
  34
  35 #define ADFS_DISCRECORD         (0xc00)
  36 #define ADFS_DR_OFFSET          (0x1c0)
  37 #define ADFS_DR_SIZE             60
  38 #define ADFS_SUPER_MAGIC         0xadf5
  39 #define ADFS_FREE_FRAG           0
  40 #define ADFS_BAD_FRAG            1
  41 #define ADFS_ROOT_FRAG           2
  42
  43 /*
  44  * Directory header
  45  */
  46 struct adfs_dirheader {
  47         unsigned char startmasseq;
  48         unsigned char startname[4];
  49 };
  50
  51 #define ADFS_NEWDIR_SIZE        2048
  52 #define ADFS_OLDDIR_SIZE        1024
  53 #define ADFS_NUM_DIR_ENTRIES    77
  54
  55 /*
  56  * Directory entries
  57  */
  58 struct adfs_direntry {
  59         char dirobname[10];
  60 #define ADFS_NAME_LEN 10
  61         __u8 dirload[4];
  62         __u8 direxec[4];
  63         __u8 dirlen[4];
  64         __u8 dirinddiscadd[3];
  65         __u8 newdiratts;
  66 #define ADFS_NDA_OWNER_READ     (1 << 0)
  67 #define ADFS_NDA_OWNER_WRITE    (1 << 1)
  68 #define ADFS_NDA_LOCKED         (1 << 2)
  69 #define ADFS_NDA_DIRECTORY      (1 << 3)
  70 #define ADFS_NDA_EXECUTE        (1 << 4)
  71 #define ADFS_NDA_PUBLIC_READ    (1 << 5)
  72 #define ADFS_NDA_PUBLIC_WRITE   (1 << 6)
  73 };
  74
  75 #define ADFS_MAX_NAME_LEN       255
  76 struct adfs_idir_entry {
  77         __u32           inode_no;                       /* Address              */
  78         __u32           file_id;                        /* file id              */
  79         __u32           name_len;                       /* name length          */
  80         __u32           size;                           /* size                 */
  81         __u32           mtime;                          /* modification time    */
  82         __u32           filetype;                       /* RiscOS file type     */
  83         __u8            mode;                           /* internal mode        */
  84         char            name[ADFS_MAX_NAME_LEN];        /* file name            */
  85 };
  86
  87 /*
  88  * Directory tail
  89  */
  90 union adfs_dirtail {
  91         struct {
  92                 unsigned char dirlastmask;
  93                 char dirname[10];
  94                 unsigned char dirparent[3];
  95                 char dirtitle[19];
  96                 unsigned char reserved[14];
  97                 unsigned char endmasseq;
  98                 unsigned char endname[4];
  99                 unsigned char dircheckbyte;
 100         } old;
 101         struct {
 102                 unsigned char dirlastmask;
 103                 unsigned char reserved[2];
 104                 unsigned char dirparent[3];
 105                 char dirtitle[19];
 106                 char dirname[10];
 107                 unsigned char endmasseq;
 108                 unsigned char endname[4];
 109                 unsigned char dircheckbyte;
 110         } new;
 111 };
 112
 113 #ifdef __KERNEL__
 114 /*
 115  * Calculate the boot block checksum on an ADFS drive.  Note that this will
 116  * appear to be correct if the sector contains all zeros, so also check that
 117  * the disk size is non-zero!!!
 118  */
 119 extern inline int adfs_checkbblk(unsigned char *ptr)
 120 {
 121         unsigned int result = 0;
 122         unsigned char *p = ptr + 511;
 123
 124         do {
 125                 result = (result & 0xff) + (result >> 8);
 126                 result = result + *--p;
 127         } while (p != ptr);
 128
 129         return (result & 0xff) != ptr[511];
 130 }
 131
 132 /* dir.c */
 133 extern unsigned int adfs_val (unsigned char *p, int len);
 134 extern int adfs_dir_read_parent (struct inode *inode, struct buffer_head **bhp);
 135 extern int adfs_dir_read (struct inode *inode, struct buffer_head **bhp);
 136 extern int adfs_dir_check (struct inode *inode, struct buffer_head **bhp,
 137                            int buffers, union adfs_dirtail *dtp);
 138 extern void adfs_dir_free (struct buffer_head **bhp, int buffers);
 139 extern int adfs_dir_get (struct super_block *sb, struct buffer_head **bhp,
 140                          int buffers, int pos, unsigned long parent_object_id,
 141                          struct adfs_idir_entry *ide);
 142 extern int adfs_dir_find_entry (struct super_block *sb, struct buffer_head **bhp,
 143                                 int buffers, unsigned int index,
 144                                 struct adfs_idir_entry *ide);
 145
 146 /* inode.c */
 147 extern int adfs_inode_validate (struct inode *inode);
 148 extern unsigned long adfs_inode_generate (unsigned long parent_id, int diridx);
 149 extern unsigned long adfs_inode_objid (struct inode *inode);
 150 extern unsigned int adfs_parent_bmap (struct inode *inode, int block);
 151 extern int adfs_bmap (struct inode *inode, int block);
 152 extern void adfs_read_inode (struct inode *inode);
 153
 154 /* map.c */
 155 extern int adfs_map_lookup (struct super_block *sb, int frag_id, int offset);
 156
 157 /* namei.c */
 158 extern struct dentry *adfs_lookup (struct inode *dir, struct dentry *dentry);
 159
 160 /* super.c */
 161 extern int init_adfs_fs (void);
 162 extern void adfs_error (struct super_block *, const char *, const char *, ...);
 163
 164 /*
 165  * Inodes and file operations
 166  */
 167
 168 /* dir.c */
 169 extern struct inode_operations adfs_dir_inode_operations;
 170
 171 /* file.c */
 172 extern struct inode_operations adfs_file_inode_operations;
 173 #endif
 174
 175 #endif