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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Roman Zippel328b9222005-09-06 15:18:49 -070028#define HFS_MAX_NAMELEN 128
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#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#define __packed __attribute__ ((packed))
87
88/* Pascal-style string of up to 31 characters */
89struct hfs_name {
90 u8 len;
91 u8 name[HFS_NAMELEN];
92} __packed;
93
94struct hfs_point {
95 __be16 v;
96 __be16 h;
97} __packed;
98
99struct hfs_rect {
100 __be16 top;
101 __be16 left;
102 __be16 bottom;
103 __be16 right;
104} __packed;
105
106struct hfs_finfo {
107 __be32 fdType;
108 __be32 fdCreator;
109 __be16 fdFlags;
110 struct hfs_point fdLocation;
111 __be16 fdFldr;
112} __packed;
113
114struct hfs_fxinfo {
115 __be16 fdIconID;
116 u8 fdUnused[8];
117 __be16 fdComment;
118 __be32 fdPutAway;
119} __packed;
120
121struct hfs_dinfo {
122 struct hfs_rect frRect;
123 __be16 frFlags;
124 struct hfs_point frLocation;
125 __be16 frView;
126} __packed;
127
128struct hfs_dxinfo {
129 struct hfs_point frScroll;
130 __be32 frOpenChain;
131 __be16 frUnused;
132 __be16 frComment;
133 __be32 frPutAway;
134} __packed;
135
136union 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: */
151struct 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: */
159struct 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
166typedef 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
172typedef union hfs_btree_key btree_key;
173
174struct hfs_extent {
175 __be16 block;
176 __be16 count;
177};
178typedef struct hfs_extent hfs_extent_rec[3];
179
180/* The catalog record for a file */
181struct hfs_cat_file {
182 s8 type; /* The type of entry */
183 u8 reserved;
184 u8 Flags; /* Flags such as read-only */
185 s8 Typ; /* file version number = 0 */
186 struct hfs_finfo UsrWds; /* data used by the Finder */
187 __be32 FlNum; /* The CNID */
188 __be16 StBlk; /* obsolete */
189 __be32 LgLen; /* The logical EOF of the data fork*/
190 __be32 PyLen; /* The physical EOF of the data fork */
191 __be16 RStBlk; /* obsolete */
192 __be32 RLgLen; /* The logical EOF of the rsrc fork */
193 __be32 RPyLen; /* The physical EOF of the rsrc fork */
194 __be32 CrDat; /* The creation date */
195 __be32 MdDat; /* The modified date */
196 __be32 BkDat; /* The last backup date */
197 struct hfs_fxinfo FndrInfo; /* more data for the Finder */
198 __be16 ClpSize; /* number of bytes to allocate
199 when extending files */
200 hfs_extent_rec ExtRec; /* first extent record
201 for the data fork */
202 hfs_extent_rec RExtRec; /* first extent record
203 for the resource fork */
204 u32 Resrv; /* reserved by Apple */
205} __packed;
206
207/* the catalog record for a directory */
208struct hfs_cat_dir {
209 s8 type; /* The type of entry */
210 u8 reserved;
211 __be16 Flags; /* flags */
212 __be16 Val; /* Valence: number of files and
213 dirs in the directory */
214 __be32 DirID; /* The CNID */
215 __be32 CrDat; /* The creation date */
216 __be32 MdDat; /* The modification date */
217 __be32 BkDat; /* The last backup date */
218 struct hfs_dinfo UsrInfo; /* data used by the Finder */
219 struct hfs_dxinfo FndrInfo; /* more data used by Finder */
220 u8 Resrv[16]; /* reserved by Apple */
221} __packed;
222
223/* the catalog record for a thread */
224struct hfs_cat_thread {
225 s8 type; /* The type of entry */
226 u8 reserved[9]; /* reserved by Apple */
227 __be32 ParID; /* CNID of parent directory */
228 struct hfs_name CName; /* The name of this entry */
229} __packed;
230
231/* A catalog tree record */
232typedef union hfs_cat_rec {
233 s8 type; /* The type of entry */
234 struct hfs_cat_file file;
235 struct hfs_cat_dir dir;
236 struct hfs_cat_thread thread;
237} hfs_cat_rec;
238
239struct hfs_mdb {
240 __be16 drSigWord; /* Signature word indicating fs type */
241 __be32 drCrDate; /* fs creation date/time */
242 __be32 drLsMod; /* fs modification date/time */
243 __be16 drAtrb; /* fs attributes */
244 __be16 drNmFls; /* number of files in root directory */
245 __be16 drVBMSt; /* location (in 512-byte blocks)
246 of the volume bitmap */
247 __be16 drAllocPtr; /* location (in allocation blocks)
248 to begin next allocation search */
249 __be16 drNmAlBlks; /* number of allocation blocks */
250 __be32 drAlBlkSiz; /* bytes in an allocation block */
251 __be32 drClpSiz; /* clumpsize, the number of bytes to
252 allocate when extending a file */
253 __be16 drAlBlSt; /* location (in 512-byte blocks)
254 of the first allocation block */
255 __be32 drNxtCNID; /* CNID to assign to the next
256 file or directory created */
257 __be16 drFreeBks; /* number of free allocation blocks */
258 u8 drVN[28]; /* the volume label */
259 __be32 drVolBkUp; /* fs backup date/time */
260 __be16 drVSeqNum; /* backup sequence number */
261 __be32 drWrCnt; /* fs write count */
262 __be32 drXTClpSiz; /* clumpsize for the extents B-tree */
263 __be32 drCTClpSiz; /* clumpsize for the catalog B-tree */
264 __be16 drNmRtDirs; /* number of directories in
265 the root directory */
266 __be32 drFilCnt; /* number of files in the fs */
267 __be32 drDirCnt; /* number of directories in the fs */
268 u8 drFndrInfo[32]; /* data used by the Finder */
269 __be16 drEmbedSigWord; /* embedded volume signature */
270 __be32 drEmbedExtent; /* starting block number (xdrStABN)
271 and number of allocation blocks
272 (xdrNumABlks) occupied by embedded
273 volume */
274 __be32 drXTFlSize; /* bytes in the extents B-tree */
275 hfs_extent_rec drXTExtRec; /* extents B-tree's first 3 extents */
276 __be32 drCTFlSize; /* bytes in the catalog B-tree */
277 hfs_extent_rec drCTExtRec; /* catalog B-tree's first 3 extents */
278} __packed;
279
280/*======== Data structures kept in memory ========*/
281
282struct hfs_readdir_data {
283 struct list_head list;
284 struct file *file;
285 struct hfs_cat_key key;
286};
287
288#endif