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         uid_t           s_uid;          /* owner uid                             */
  50         gid_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
  54         __u32           s_ids_per_zone; /* max. no ids in one zone               */
  55         __u32           s_idlen;        /* length of ID in map                   */
  56         __u32           s_map_size;     /* sector size of a map                  */
  57         unsigned long   s_size;         /* total size (in blocks) of this fs     */
  58         signed int      s_map2blk;      /* shift left by this for map->sector    */
  59         unsigned int    s_log2sharesize;/* log2 share size                       */
  60         __le32          s_version;      /* disc format version                   */
  61         unsigned int    s_namelen;      /* maximum number of characters in name  */
  62 };
  63
  64 static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
  65 {
  66         return sb->s_fs_info;
  67 }
  68
  69 static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
  70 {
  71         return container_of(inode, struct adfs_inode_info, vfs_inode);
  72 }
  73
  74 /*
  75  * Directory handling
  76  */
  77 struct adfs_dir {
  78         struct super_block      *sb;
  79
  80         int                     nr_buffers;
  81         struct buffer_head      *bh[4];
  82         unsigned int            pos;
  83         unsigned int            parent_id;
  84
  85         struct adfs_dirheader   dirhead;
  86         union  adfs_dirtail     dirtail;
  87 };
  88
  89 /*
  90  * This is the overall maximum name length
  91  */
  92 #define ADFS_MAX_NAME_LEN       256
  93 struct object_info {
  94         __u32           parent_id;              /* parent object id     */
  95         __u32           file_id;                /* object id            */
  96         __u32           loadaddr;               /* load address         */
  97         __u32           execaddr;               /* execution address    */
  98         __u32           size;                   /* size                 */
  99         __u8            attr;                   /* RISC OS attributes   */
 100         unsigned char   name_len;               /* name length          */
 101         char            name[ADFS_MAX_NAME_LEN];/* file name            */
 102 };
 103
 104 struct adfs_dir_ops {
 105         int     (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
 106         int     (*setpos)(struct adfs_dir *dir, unsigned int fpos);
 107         int     (*getnext)(struct adfs_dir *dir, struct object_info *obj);
 108         int     (*update)(struct adfs_dir *dir, struct object_info *obj);
 109         int     (*create)(struct adfs_dir *dir, struct object_info *obj);
 110         int     (*remove)(struct adfs_dir *dir, struct object_info *obj);
 111         int     (*sync)(struct adfs_dir *dir);
 112         void    (*free)(struct adfs_dir *dir);
 113 };
 114
 115 struct adfs_discmap {
 116         struct buffer_head      *dm_bh;
 117         __u32                   dm_startblk;
 118         unsigned int            dm_startbit;
 119         unsigned int            dm_endbit;
 120 };
 121
 122 /* Inode stuff */
 123 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
 124 int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
 125 int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
 126
 127 /* map.c */
 128 extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
 129 extern unsigned int adfs_map_free(struct super_block *sb);
 130
 131 /* Misc */
 132 void __adfs_error(struct super_block *sb, const char *function,
 133                   const char *fmt, ...);
 134 #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
 135
 136 /* super.c */
 137
 138 /*
 139  * Inodes and file operations
 140  */
 141
 142 /* dir_*.c */
 143 extern const struct inode_operations adfs_dir_inode_operations;
 144 extern const struct file_operations adfs_dir_operations;
 145 extern const struct dentry_operations adfs_dentry_operations;
 146 extern struct adfs_dir_ops adfs_f_dir_ops;
 147 extern struct adfs_dir_ops adfs_fplus_dir_ops;
 148
 149 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
 150                            int wait);
 151
 152 /* file.c */
 153 extern const struct inode_operations adfs_file_inode_operations;
 154 extern const struct file_operations adfs_file_operations;
 155
 156 static inline __u32 signed_asl(__u32 val, signed int shift)
 157 {
 158         if (shift >= 0)
 159                 val <<= shift;
 160         else
 161                 val >>= -shift;
 162         return val;
 163 }
 164
 165 /*
 166  * Calculate the address of a block in an object given the block offset
 167  * and the object identity.
 168  *
 169  * The root directory ID should always be looked up in the map [3.4]
 170  */
 171 static inline int
 172 __adfs_block_map(struct super_block *sb, unsigned int object_id,
 173                  unsigned int block)
 174 {
 175         if (object_id & 255) {
 176                 unsigned int off;
 177
 178                 off = (object_id & 255) - 1;
 179                 block += off << ADFS_SB(sb)->s_log2sharesize;
 180         }
 181
 182         return adfs_map_lookup(sb, object_id >> 8, block);
 183 }