linux/fs/adfs/adfs.h
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   1#include <linux/fs.h>
   2#include <linux/adfs_fs.h>
   3
   4/* Internal data structures for ADFS */
   5
   6#define ADFS_FREE_FRAG           0
   7#define ADFS_BAD_FRAG            1
   8#define ADFS_ROOT_FRAG           2
   9
  10#define ADFS_NDA_OWNER_READ     (1 << 0)
  11#define ADFS_NDA_OWNER_WRITE    (1 << 1)
  12#define ADFS_NDA_LOCKED         (1 << 2)
  13#define ADFS_NDA_DIRECTORY      (1 << 3)
  14#define ADFS_NDA_EXECUTE        (1 << 4)
  15#define ADFS_NDA_PUBLIC_READ    (1 << 5)
  16#define ADFS_NDA_PUBLIC_WRITE   (1 << 6)
  17
  18#include "dir_f.h"
  19
  20struct buffer_head;
  21
  22/*
  23 * adfs file system inode data in memory
  24 */
  25struct adfs_inode_info {
  26        loff_t          mmu_private;
  27        unsigned long   parent_id;      /* object id of parent          */
  28        __u32           loadaddr;       /* RISC OS load address         */
  29        __u32           execaddr;       /* RISC OS exec address         */
  30        unsigned int    filetype;       /* RISC OS file type            */
  31        unsigned int    attr;           /* RISC OS permissions          */
  32        unsigned int    stamped:1;      /* RISC OS file has date/time   */
  33        struct inode vfs_inode;
  34};
  35
  36/*
  37 * Forward-declare this
  38 */
  39struct adfs_discmap;
  40struct adfs_dir_ops;
  41
  42/*
  43 * ADFS file system superblock data in memory
  44 */
  45struct adfs_sb_info {
  46        struct adfs_discmap *s_map;     /* bh list containing map                */
  47        struct adfs_dir_ops *s_dir;     /* directory operations                  */
  48
  49        kuid_t          s_uid;          /* owner uid                             */
  50        kgid_t          s_gid;          /* owner gid                             */
  51        umode_t         s_owner_mask;   /* ADFS owner perm -> unix perm          */
  52        umode_t         s_other_mask;   /* ADFS other perm -> unix perm          */
  53        int             s_ftsuffix;     /* ,xyz hex filetype suffix option */
  54
  55        __u32           s_ids_per_zone; /* max. no ids in one zone               */
  56        __u32           s_idlen;        /* length of ID in map                   */
  57        __u32           s_map_size;     /* sector size of a map                  */
  58        unsigned long   s_size;         /* total size (in blocks) of this fs     */
  59        signed int      s_map2blk;      /* shift left by this for map->sector    */
  60        unsigned int    s_log2sharesize;/* log2 share size                       */
  61        __le32          s_version;      /* disc format version                   */
  62        unsigned int    s_namelen;      /* maximum number of characters in name  */
  63};
  64
  65static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
  66{
  67        return sb->s_fs_info;
  68}
  69
  70static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
  71{
  72        return container_of(inode, struct adfs_inode_info, vfs_inode);
  73}
  74
  75/*
  76 * Directory handling
  77 */
  78struct adfs_dir {
  79        struct super_block      *sb;
  80
  81        int                     nr_buffers;
  82        struct buffer_head      *bh[4];
  83
  84        /* big directories need allocated buffers */
  85        struct buffer_head      **bh_fplus;
  86
  87        unsigned int            pos;
  88        unsigned int            parent_id;
  89
  90        struct adfs_dirheader   dirhead;
  91        union  adfs_dirtail     dirtail;
  92};
  93
  94/*
  95 * This is the overall maximum name length
  96 */
  97#define ADFS_MAX_NAME_LEN       (256 + 4) /* +4 for ,xyz hex filetype suffix */
  98struct object_info {
  99        __u32           parent_id;              /* parent object id     */
 100        __u32           file_id;                /* object id            */
 101        __u32           loadaddr;               /* load address         */
 102        __u32           execaddr;               /* execution address    */
 103        __u32           size;                   /* size                 */
 104        __u8            attr;                   /* RISC OS attributes   */
 105        unsigned int    name_len;               /* name length          */
 106        char            name[ADFS_MAX_NAME_LEN];/* file name            */
 107
 108        /* RISC OS file type (12-bit: derived from loadaddr) */
 109        __u16           filetype;
 110};
 111
 112/* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */
 113static inline int append_filetype_suffix(char *buf, __u16 filetype)
 114{
 115        if (filetype == 0xffff) /* no explicit 12-bit file type was set */
 116                return 0;
 117
 118        *buf++ = ',';
 119        *buf++ = hex_asc_lo(filetype >> 8);
 120        *buf++ = hex_asc_lo(filetype >> 4);
 121        *buf++ = hex_asc_lo(filetype >> 0);
 122        return 4;
 123}
 124
 125struct adfs_dir_ops {
 126        int     (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
 127        int     (*setpos)(struct adfs_dir *dir, unsigned int fpos);
 128        int     (*getnext)(struct adfs_dir *dir, struct object_info *obj);
 129        int     (*update)(struct adfs_dir *dir, struct object_info *obj);
 130        int     (*create)(struct adfs_dir *dir, struct object_info *obj);
 131        int     (*remove)(struct adfs_dir *dir, struct object_info *obj);
 132        int     (*sync)(struct adfs_dir *dir);
 133        void    (*free)(struct adfs_dir *dir);
 134};
 135
 136struct adfs_discmap {
 137        struct buffer_head      *dm_bh;
 138        __u32                   dm_startblk;
 139        unsigned int            dm_startbit;
 140        unsigned int            dm_endbit;
 141};
 142
 143/* Inode stuff */
 144struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
 145int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
 146int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
 147
 148/* map.c */
 149extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
 150extern unsigned int adfs_map_free(struct super_block *sb);
 151
 152/* Misc */
 153void __adfs_error(struct super_block *sb, const char *function,
 154                  const char *fmt, ...);
 155#define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
 156
 157/* super.c */
 158
 159/*
 160 * Inodes and file operations
 161 */
 162
 163/* dir_*.c */
 164extern const struct inode_operations adfs_dir_inode_operations;
 165extern const struct file_operations adfs_dir_operations;
 166extern const struct dentry_operations adfs_dentry_operations;
 167extern struct adfs_dir_ops adfs_f_dir_ops;
 168extern struct adfs_dir_ops adfs_fplus_dir_ops;
 169
 170extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
 171                           int wait);
 172
 173/* file.c */
 174extern const struct inode_operations adfs_file_inode_operations;
 175extern const struct file_operations adfs_file_operations;
 176
 177static inline __u32 signed_asl(__u32 val, signed int shift)
 178{
 179        if (shift >= 0)
 180                val <<= shift;
 181        else
 182                val >>= -shift;
 183        return val;
 184}
 185
 186/*
 187 * Calculate the address of a block in an object given the block offset
 188 * and the object identity.
 189 *
 190 * The root directory ID should always be looked up in the map [3.4]
 191 */
 192static inline int
 193__adfs_block_map(struct super_block *sb, unsigned int object_id,
 194                 unsigned int block)
 195{
 196        if (object_id & 255) {
 197                unsigned int off;
 198
 199                off = (object_id & 255) - 1;
 200                block += off << ADFS_SB(sb)->s_log2sharesize;
 201        }
 202
 203        return adfs_map_lookup(sb, object_id >> 8, block);
 204}
 205
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