fs/adfs/adfs.h

   1 /* Internal data structures for ADFS */
   2
   3 #define ADFS_FREE_FRAG           0
   4 #define ADFS_BAD_FRAG            1
   5 #define ADFS_ROOT_FRAG           2
   6
   7 #define ADFS_NDA_OWNER_READ     (1 << 0)
   8 #define ADFS_NDA_OWNER_WRITE    (1 << 1)
   9 #define ADFS_NDA_LOCKED         (1 << 2)
  10 #define ADFS_NDA_DIRECTORY      (1 << 3)
  11 #define ADFS_NDA_EXECUTE        (1 << 4)
  12 #define ADFS_NDA_PUBLIC_READ    (1 << 5)
  13 #define ADFS_NDA_PUBLIC_WRITE   (1 << 6)
  14
  15 #include <linux/version.h>
  16 #include "dir_f.h"
  17
  18 struct buffer_head;
  19
  20 /*
  21  * Directory handling
  22  */
  23 struct adfs_dir {
  24         struct super_block      *sb;
  25
  26         int                     nr_buffers;
  27         struct buffer_head      *bh[4];
  28         unsigned int            pos;
  29         unsigned int            parent_id;
  30
  31         struct adfs_dirheader   dirhead;
  32         union  adfs_dirtail     dirtail;
  33 };
  34
  35 /*
  36  * This is the overall maximum name length
  37  */
  38 #define ADFS_MAX_NAME_LEN       256
  39 struct object_info {
  40         __u32           parent_id;              /* parent object id     */
  41         __u32           file_id;                /* object id            */
  42         __u32           loadaddr;               /* load address         */
  43         __u32           execaddr;               /* execution address    */
  44         __u32           size;                   /* size                 */
  45         __u8            attr;                   /* RISC OS attributes   */
  46         unsigned char   name_len;               /* name length          */
  47         char            name[ADFS_MAX_NAME_LEN];/* file name            */
  48 };
  49
  50 struct adfs_dir_ops {
  51         int     (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
  52         int     (*setpos)(struct adfs_dir *dir, unsigned int fpos);
  53         int     (*getnext)(struct adfs_dir *dir, struct object_info *obj);
  54         int     (*update)(struct adfs_dir *dir, struct object_info *obj);
  55         int     (*create)(struct adfs_dir *dir, struct object_info *obj);
  56         int     (*remove)(struct adfs_dir *dir, struct object_info *obj);
  57         void    (*free)(struct adfs_dir *dir);
  58 };
  59
  60 struct adfs_discmap {
  61         struct buffer_head      *dm_bh;
  62         __u32                   dm_startblk;
  63         unsigned int            dm_startbit;
  64         unsigned int            dm_endbit;
  65 };
  66
  67 /* Inode stuff */
  68 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
  69 int adfs_write_inode(struct inode *inode,int unused);
  70 int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
  71
  72 /* map.c */
  73 extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
  74 extern unsigned int adfs_map_free(struct super_block *sb);
  75
  76 /* Misc */
  77 void __adfs_error(struct super_block *sb, const char *function,
  78                   const char *fmt, ...);
  79 #define adfs_error(sb, fmt...) __adfs_error(sb, __FUNCTION__, fmt)
  80
  81 /* super.c */
  82
  83 /*
  84  * Inodes and file operations
  85  */
  86
  87 /* dir_*.c */
  88 extern struct inode_operations adfs_dir_inode_operations;
  89 extern struct file_operations adfs_dir_operations;
  90 extern struct dentry_operations adfs_dentry_operations;
  91 extern struct adfs_dir_ops adfs_f_dir_ops;
  92 extern struct adfs_dir_ops adfs_fplus_dir_ops;
  93
  94 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj);
  95
  96 /* file.c */
  97 extern struct inode_operations adfs_file_inode_operations;
  98 extern struct file_operations adfs_file_operations;
  99
 100 static inline __u32 signed_asl(__u32 val, signed int shift)
 101 {
 102         if (shift >= 0)
 103                 val <<= shift;
 104         else
 105                 val >>= -shift;
 106         return val;
 107 }
 108
 109 /*
 110  * Calculate the address of a block in an object given the block offset
 111  * and the object identity.
 112  *
 113  * The root directory ID should always be looked up in the map [3.4]
 114  */
 115 static inline int
 116 __adfs_block_map(struct super_block *sb, unsigned int object_id,
 117                  unsigned int block)
 118 {
 119         if (object_id & 255) {
 120                 unsigned int off;
 121
 122                 off = (object_id & 255) - 1;
 123                 block += off << ADFS_SB(sb)->s_log2sharesize;
 124         }
 125
 126         return adfs_map_lookup(sb, object_id >> 8, block);
 127 }