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         union { struct {
  47                 struct adfs_discmap *s_map;     /* bh list containing map        */
  48                 struct adfs_dir_ops *s_dir;     /* directory operations          */
  49                 };
  50                 struct rcu_head rcu;            /* used only at shutdown time    */
  51         };
  52         kuid_t          s_uid;          /* owner uid                             */
  53         kgid_t          s_gid;          /* owner gid                             */
  54         umode_t         s_owner_mask;   /* ADFS owner perm -> unix perm          */
  55         umode_t         s_other_mask;   /* ADFS other perm -> unix perm          */
  56         int             s_ftsuffix;     /* ,xyz hex filetype suffix option */
  57
  58         __u32           s_ids_per_zone; /* max. no ids in one zone               */
  59         __u32           s_idlen;        /* length of ID in map                   */
  60         __u32           s_map_size;     /* sector size of a map                  */
  61         unsigned long   s_size;         /* total size (in blocks) of this fs     */
  62         signed int      s_map2blk;      /* shift left by this for map->sector    */
  63         unsigned int    s_log2sharesize;/* log2 share size                       */
  64         __le32          s_version;      /* disc format version                   */
  65         unsigned int    s_namelen;      /* maximum number of characters in name  */
  66 };
  67
  68 static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
  69 {
  70         return sb->s_fs_info;
  71 }
  72
  73 static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
  74 {
  75         return container_of(inode, struct adfs_inode_info, vfs_inode);
  76 }
  77
  78 /*
  79  * Directory handling
  80  */
  81 struct adfs_dir {
  82         struct super_block      *sb;
  83
  84         int                     nr_buffers;
  85         struct buffer_head      *bh[4];
  86
  87         /* big directories need allocated buffers */
  88         struct buffer_head      **bh_fplus;
  89
  90         unsigned int            pos;
  91         unsigned int            parent_id;
  92
  93         struct adfs_dirheader   dirhead;
  94         union  adfs_dirtail     dirtail;
  95 };
  96
  97 /*
  98  * This is the overall maximum name length
  99  */
 100 #define ADFS_MAX_NAME_LEN       (256 + 4) /* +4 for ,xyz hex filetype suffix */
 101 struct object_info {
 102         __u32           parent_id;              /* parent object id     */
 103         __u32           file_id;                /* object id            */
 104         __u32           loadaddr;               /* load address         */
 105         __u32           execaddr;               /* execution address    */
 106         __u32           size;                   /* size                 */
 107         __u8            attr;                   /* RISC OS attributes   */
 108         unsigned int    name_len;               /* name length          */
 109         char            name[ADFS_MAX_NAME_LEN];/* file name            */
 110
 111         /* RISC OS file type (12-bit: derived from loadaddr) */
 112         __u16           filetype;
 113 };
 114
 115 /* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */
 116 static inline int append_filetype_suffix(char *buf, __u16 filetype)
 117 {
 118         if (filetype == 0xffff) /* no explicit 12-bit file type was set */
 119                 return 0;
 120
 121         *buf++ = ',';
 122         *buf++ = hex_asc_lo(filetype >> 8);
 123         *buf++ = hex_asc_lo(filetype >> 4);
 124         *buf++ = hex_asc_lo(filetype >> 0);
 125         return 4;
 126 }
 127
 128 struct adfs_dir_ops {
 129         int     (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
 130         int     (*setpos)(struct adfs_dir *dir, unsigned int fpos);
 131         int     (*getnext)(struct adfs_dir *dir, struct object_info *obj);
 132         int     (*update)(struct adfs_dir *dir, struct object_info *obj);
 133         int     (*create)(struct adfs_dir *dir, struct object_info *obj);
 134         int     (*remove)(struct adfs_dir *dir, struct object_info *obj);
 135         int     (*sync)(struct adfs_dir *dir);
 136         void    (*free)(struct adfs_dir *dir);
 137 };
 138
 139 struct adfs_discmap {
 140         struct buffer_head      *dm_bh;
 141         __u32                   dm_startblk;
 142         unsigned int            dm_startbit;
 143         unsigned int            dm_endbit;
 144 };
 145
 146 /* Inode stuff */
 147 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
 148 int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
 149 int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
 150
 151 /* map.c */
 152 extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
 153 extern unsigned int adfs_map_free(struct super_block *sb);
 154
 155 /* Misc */
 156 __printf(3, 4)
 157 void __adfs_error(struct super_block *sb, const char *function,
 158                   const char *fmt, ...);
 159 #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
 160
 161 /* super.c */
 162
 163 /*
 164  * Inodes and file operations
 165  */
 166
 167 /* dir_*.c */
 168 extern const struct inode_operations adfs_dir_inode_operations;
 169 extern const struct file_operations adfs_dir_operations;
 170 extern const struct dentry_operations adfs_dentry_operations;
 171 extern struct adfs_dir_ops adfs_f_dir_ops;
 172 extern struct adfs_dir_ops adfs_fplus_dir_ops;
 173
 174 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
 175                            int wait);
 176
 177 /* file.c */
 178 extern const struct inode_operations adfs_file_inode_operations;
 179 extern const struct file_operations adfs_file_operations;
 180
 181 static inline __u32 signed_asl(__u32 val, signed int shift)
 182 {
 183         if (shift >= 0)
 184                 val <<= shift;
 185         else
 186                 val >>= -shift;
 187         return val;
 188 }
 189
 190 /*
 191  * Calculate the address of a block in an object given the block offset
 192  * and the object identity.
 193  *
 194  * The root directory ID should always be looked up in the map [3.4]
 195  */
 196 static inline int
 197 __adfs_block_map(struct super_block *sb, unsigned int object_id,
 198                  unsigned int block)
 199 {
 200         if (object_id & 255) {
 201                 unsigned int off;
 202
 203                 off = (object_id & 255) - 1;
 204                 block += off << ADFS_SB(sb)->s_log2sharesize;
 205         }
 206
 207         return adfs_map_lookup(sb, object_id >> 8, block);
 208 }