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Linux/fs/hfs/hfs.h

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

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