fs/hfs/hfs.h

   1 /*
   2  *  linux/fs/hfs/hfs.h
   3  *
   4  * Copyright (C) 1995-1997  Paul H. Hargrove
   5  * (C) 2003 Ardis Technologies <roman@ardistech.com>
   6  * This file may be distributed under the terms of the GNU General Public License.
   7  */
   8
   9 #ifndef _HFS_H
  10 #define _HFS_H
  11
  12 /* offsets to various blocks */
  13 #define HFS_DD_BLK              0 /* Driver Descriptor block */
  14 #define HFS_PMAP_BLK            1 /* First block of partition map */
  15 #define HFS_MDB_BLK             2 /* Block (w/i partition) of MDB */
  16
  17 /* magic numbers for various disk blocks */
  18 #define HFS_DRVR_DESC_MAGIC     0x4552 /* "ER": driver descriptor map */
  19 #define HFS_OLD_PMAP_MAGIC      0x5453 /* "TS": old-type partition map */
  20 #define HFS_NEW_PMAP_MAGIC      0x504D /* "PM": new-type partition map */
  21 #define HFS_SUPER_MAGIC         0x4244 /* "BD": HFS MDB (super block) */
  22 #define HFS_MFS_SUPER_MAGIC     0xD2D7 /* MFS MDB (super block) */
  23
  24 /* various FIXED size parameters */
  25 #define HFS_SECTOR_SIZE         512    /* size of an HFS sector */
  26 #define HFS_SECTOR_SIZE_BITS    9      /* log_2(HFS_SECTOR_SIZE) */
  27 #define HFS_NAMELEN             31     /* maximum length of an HFS filename */
  28 #define HFS_MAX_NAMELEN         128
  29 #define HFS_MAX_VALENCE         32767U
  30
  31 #define HFS_BAD_KEYLEN          0xFF
  32
  33 /* Meanings of the drAtrb field of the MDB,
  34  * Reference: _Inside Macintosh: Files_ p. 2-61
  35  */
  36 #define HFS_SB_ATTRIB_HLOCK     (1 << 7)
  37 #define HFS_SB_ATTRIB_UNMNT     (1 << 8)
  38 #define HFS_SB_ATTRIB_SPARED    (1 << 9)
  39 #define HFS_SB_ATTRIB_INCNSTNT  (1 << 11)
  40 #define HFS_SB_ATTRIB_SLOCK     (1 << 15)
  41
  42 /* Some special File ID numbers */
  43 #define HFS_POR_CNID            1       /* Parent Of the Root */
  44 #define HFS_ROOT_CNID           2       /* ROOT directory */
  45 #define HFS_EXT_CNID            3       /* EXTents B-tree */
  46 #define HFS_CAT_CNID            4       /* CATalog B-tree */
  47 #define HFS_BAD_CNID            5       /* BAD blocks file */
  48 #define HFS_ALLOC_CNID          6       /* ALLOCation file (HFS+) */
  49 #define HFS_START_CNID          7       /* STARTup file (HFS+) */
  50 #define HFS_ATTR_CNID           8       /* ATTRibutes file (HFS+) */
  51 #define HFS_EXCH_CNID           15      /* ExchangeFiles temp id */
  52 #define HFS_FIRSTUSER_CNID      16
  53
  54 /* values for hfs_cat_rec.cdrType */
  55 #define HFS_CDR_DIR    0x01    /* folder (directory) */
  56 #define HFS_CDR_FIL    0x02    /* file */
  57 #define HFS_CDR_THD    0x03    /* folder (directory) thread */
  58 #define HFS_CDR_FTH    0x04    /* file thread */
  59
  60 /* legal values for hfs_ext_key.FkType and hfs_file.fork */
  61 #define HFS_FK_DATA     0x00
  62 #define HFS_FK_RSRC     0xFF
  63
  64 /* bits in hfs_fil_entry.Flags */
  65 #define HFS_FIL_LOCK    0x01  /* locked */
  66 #define HFS_FIL_THD     0x02  /* file thread */
  67 #define HFS_FIL_DOPEN   0x04  /* data fork open */
  68 #define HFS_FIL_ROPEN   0x08  /* resource fork open */
  69 #define HFS_FIL_DIR     0x10  /* directory (always clear) */
  70 #define HFS_FIL_NOCOPY  0x40  /* copy-protected file */
  71 #define HFS_FIL_USED    0x80  /* open */
  72
  73 /* bits in hfs_dir_entry.Flags. dirflags is 16 bits. */
  74 #define HFS_DIR_LOCK        0x01  /* locked */
  75 #define HFS_DIR_THD         0x02  /* directory thread */
  76 #define HFS_DIR_INEXPFOLDER 0x04  /* in a shared area */
  77 #define HFS_DIR_MOUNTED     0x08  /* mounted */
  78 #define HFS_DIR_DIR         0x10  /* directory (always set) */
  79 #define HFS_DIR_EXPFOLDER   0x20  /* share point */
  80
  81 /* bits hfs_finfo.fdFlags */
  82 #define HFS_FLG_INITED          0x0100
  83 #define HFS_FLG_LOCKED          0x1000
  84 #define HFS_FLG_INVISIBLE       0x4000
  85
  86 /*======== HFS structures as they appear on the disk ========*/
  87
  88 /* Pascal-style string of up to 31 characters */
  89 struct hfs_name {
  90         u8 len;
  91         u8 name[HFS_NAMELEN];
  92 } __packed;
  93
  94 struct hfs_point {
  95         __be16 v;
  96         __be16 h;
  97 } __packed;
  98
  99 struct hfs_rect {
 100         __be16 top;
 101         __be16 left;
 102         __be16 bottom;
 103         __be16 right;
 104 } __packed;
 105
 106 struct hfs_finfo {
 107         __be32 fdType;
 108         __be32 fdCreator;
 109         __be16 fdFlags;
 110         struct hfs_point fdLocation;
 111         __be16 fdFldr;
 112 } __packed;
 113
 114 struct hfs_fxinfo {
 115         __be16 fdIconID;
 116         u8 fdUnused[8];
 117         __be16 fdComment;
 118         __be32 fdPutAway;
 119 } __packed;
 120
 121 struct hfs_dinfo {
 122         struct hfs_rect frRect;
 123         __be16 frFlags;
 124         struct hfs_point frLocation;
 125         __be16 frView;
 126 } __packed;
 127
 128 struct hfs_dxinfo {
 129         struct hfs_point frScroll;
 130         __be32 frOpenChain;
 131         __be16 frUnused;
 132         __be16 frComment;
 133         __be32 frPutAway;
 134 } __packed;
 135
 136 union hfs_finder_info {
 137         struct {
 138                 struct hfs_finfo finfo;
 139                 struct hfs_fxinfo fxinfo;
 140         } file;
 141         struct {
 142                 struct hfs_dinfo dinfo;
 143                 struct hfs_dxinfo dxinfo;
 144         } dir;
 145 } __packed;
 146
 147 /* Cast to a pointer to a generic bkey */
 148 #define HFS_BKEY(X)     (((void)((X)->KeyLen)), ((struct hfs_bkey *)(X)))
 149
 150 /* The key used in the catalog b-tree: */
 151 struct hfs_cat_key {
 152         u8 key_len;             /* number of bytes in the key */
 153         u8 reserved;            /* padding */
 154         __be32 ParID;           /* CNID of the parent dir */
 155         struct hfs_name CName;  /* The filename of the entry */
 156 } __packed;
 157
 158 /* The key used in the extents b-tree: */
 159 struct hfs_ext_key {
 160         u8 key_len;             /* number of bytes in the key */
 161         u8 FkType;              /* HFS_FK_{DATA,RSRC} */
 162         __be32 FNum;            /* The File ID of the file */
 163         __be16 FABN;            /* allocation blocks number*/
 164 } __packed;
 165
 166 typedef union hfs_btree_key {
 167         u8 key_len;                     /* number of bytes in the key */
 168         struct hfs_cat_key cat;
 169         struct hfs_ext_key ext;
 170 } hfs_btree_key;
 171
 172 #define HFS_MAX_CAT_KEYLEN      (sizeof(struct hfs_cat_key) - sizeof(u8))
 173 #define HFS_MAX_EXT_KEYLEN      (sizeof(struct hfs_ext_key) - sizeof(u8))
 174
 175 typedef union hfs_btree_key btree_key;
 176
 177 struct hfs_extent {
 178         __be16 block;
 179         __be16 count;
 180 };
 181 typedef struct hfs_extent hfs_extent_rec[3];
 182
 183 /* The catalog record for a file */
 184 struct hfs_cat_file {
 185         s8 type;                        /* The type of entry */
 186         u8 reserved;
 187         u8 Flags;                       /* Flags such as read-only */
 188         s8 Typ;                         /* file version number = 0 */
 189         struct hfs_finfo UsrWds;        /* data used by the Finder */
 190         __be32 FlNum;                   /* The CNID */
 191         __be16 StBlk;                   /* obsolete */
 192         __be32 LgLen;                   /* The logical EOF of the data fork*/
 193         __be32 PyLen;                   /* The physical EOF of the data fork */
 194         __be16 RStBlk;                  /* obsolete */
 195         __be32 RLgLen;                  /* The logical EOF of the rsrc fork */
 196         __be32 RPyLen;                  /* The physical EOF of the rsrc fork */
 197         __be32 CrDat;                   /* The creation date */
 198         __be32 MdDat;                   /* The modified date */
 199         __be32 BkDat;                   /* The last backup date */
 200         struct hfs_fxinfo FndrInfo;     /* more data for the Finder */
 201         __be16 ClpSize;                 /* number of bytes to allocate
 202                                            when extending files */
 203         hfs_extent_rec ExtRec;          /* first extent record
 204                                            for the data fork */
 205         hfs_extent_rec RExtRec;         /* first extent record
 206                                            for the resource fork */
 207         u32 Resrv;                      /* reserved by Apple */
 208 } __packed;
 209
 210 /* the catalog record for a directory */
 211 struct hfs_cat_dir {
 212         s8 type;                        /* The type of entry */
 213         u8 reserved;
 214         __be16 Flags;                   /* flags */
 215         __be16 Val;                     /* Valence: number of files and
 216                                            dirs in the directory */
 217         __be32 DirID;                   /* The CNID */
 218         __be32 CrDat;                   /* The creation date */
 219         __be32 MdDat;                   /* The modification date */
 220         __be32 BkDat;                   /* The last backup date */
 221         struct hfs_dinfo UsrInfo;       /* data used by the Finder */
 222         struct hfs_dxinfo FndrInfo;     /* more data used by Finder */
 223         u8 Resrv[16];                   /* reserved by Apple */
 224 } __packed;
 225
 226 /* the catalog record for a thread */
 227 struct hfs_cat_thread {
 228         s8 type;                        /* The type of entry */
 229         u8 reserved[9];                 /* reserved by Apple */
 230         __be32 ParID;                   /* CNID of parent directory */
 231         struct hfs_name CName;          /* The name of this entry */
 232 }  __packed;
 233
 234 /* A catalog tree record */
 235 typedef union hfs_cat_rec {
 236         s8 type;                        /* The type of entry */
 237         struct hfs_cat_file file;
 238         struct hfs_cat_dir dir;
 239         struct hfs_cat_thread thread;
 240 } hfs_cat_rec;
 241
 242 struct hfs_mdb {
 243         __be16 drSigWord;               /* Signature word indicating fs type */
 244         __be32 drCrDate;                /* fs creation date/time */
 245         __be32 drLsMod;                 /* fs modification date/time */
 246         __be16 drAtrb;                  /* fs attributes */
 247         __be16 drNmFls;                 /* number of files in root directory */
 248         __be16 drVBMSt;                 /* location (in 512-byte blocks)
 249                                            of the volume bitmap */
 250         __be16 drAllocPtr;              /* location (in allocation blocks)
 251                                            to begin next allocation search */
 252         __be16 drNmAlBlks;              /* number of allocation blocks */
 253         __be32 drAlBlkSiz;              /* bytes in an allocation block */
 254         __be32 drClpSiz;                /* clumpsize, the number of bytes to
 255                                            allocate when extending a file */
 256         __be16 drAlBlSt;                /* location (in 512-byte blocks)
 257                                            of the first allocation block */
 258         __be32 drNxtCNID;               /* CNID to assign to the next
 259                                            file or directory created */
 260         __be16 drFreeBks;               /* number of free allocation blocks */
 261         u8 drVN[28];                    /* the volume label */
 262         __be32 drVolBkUp;               /* fs backup date/time */
 263         __be16 drVSeqNum;               /* backup sequence number */
 264         __be32 drWrCnt;                 /* fs write count */
 265         __be32 drXTClpSiz;              /* clumpsize for the extents B-tree */
 266         __be32 drCTClpSiz;              /* clumpsize for the catalog B-tree */
 267         __be16 drNmRtDirs;              /* number of directories in
 268                                            the root directory */
 269         __be32 drFilCnt;                /* number of files in the fs */
 270         __be32 drDirCnt;                /* number of directories in the fs */
 271         u8 drFndrInfo[32];              /* data used by the Finder */
 272         __be16 drEmbedSigWord;          /* embedded volume signature */
 273         __be32 drEmbedExtent;           /* starting block number (xdrStABN)
 274                                            and number of allocation blocks
 275                                            (xdrNumABlks) occupied by embedded
 276                                            volume */
 277         __be32 drXTFlSize;              /* bytes in the extents B-tree */
 278         hfs_extent_rec drXTExtRec;      /* extents B-tree's first 3 extents */
 279         __be32 drCTFlSize;              /* bytes in the catalog B-tree */
 280         hfs_extent_rec drCTExtRec;      /* catalog B-tree's first 3 extents */
 281 } __packed;
 282
 283 /*======== Data structures kept in memory ========*/
 284
 285 struct hfs_readdir_data {
 286         struct list_head list;
 287         struct file *file;
 288         struct hfs_cat_key key;
 289 };
 290
 291 #endif