fs/adfs/adfs.h

   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
  20 struct buffer_head;
  21
  22 /*
  23  * adfs file system inode data in memory
  24  */
  25 struct 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  */
  39 struct adfs_discmap;
  40 struct adfs_dir_ops;
  41
  42 /*
  43  * ADFS file system superblock data in memory
  44  */
  45 struct 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
  65 static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
  66 {
  67         return sb->s_fs_info;
  68 }
  69
  70 static 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  */
  78 struct 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 */
  98 struct 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 */
 113 static 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
 125 struct 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
 136 struct 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 */
 144 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
 145 int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
 146 int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
 147
 148 /* map.c */
 149 extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
 150 extern unsigned int adfs_map_free(struct super_block *sb);
 151
 152 /* Misc */
 153 void __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 */
 164 extern const struct inode_operations adfs_dir_inode_operations;
 165 extern const struct file_operations adfs_dir_operations;
 166 extern const struct dentry_operations adfs_dentry_operations;
 167 extern struct adfs_dir_ops adfs_f_dir_ops;
 168 extern struct adfs_dir_ops adfs_fplus_dir_ops;
 169
 170 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
 171                            int wait);
 172
 173 /* file.c */
 174 extern const struct inode_operations adfs_file_inode_operations;
 175 extern const struct file_operations adfs_file_operations;
 176
 177 static 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  */
 192 static 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 }