287 строки
9.0 KiB
C
287 строки
9.0 KiB
C
/*
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* linux/fs/hfs/hfs.h
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*
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* Copyright (C) 1995-1997 Paul H. Hargrove
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* (C) 2003 Ardis Technologies <roman@ardistech.com>
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* This file may be distributed under the terms of the GNU General Public License.
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*/
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#ifndef _HFS_H
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#define _HFS_H
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/* offsets to various blocks */
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#define HFS_DD_BLK 0 /* Driver Descriptor block */
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#define HFS_PMAP_BLK 1 /* First block of partition map */
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#define HFS_MDB_BLK 2 /* Block (w/i partition) of MDB */
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/* magic numbers for various disk blocks */
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#define HFS_DRVR_DESC_MAGIC 0x4552 /* "ER": driver descriptor map */
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#define HFS_OLD_PMAP_MAGIC 0x5453 /* "TS": old-type partition map */
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#define HFS_NEW_PMAP_MAGIC 0x504D /* "PM": new-type partition map */
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#define HFS_SUPER_MAGIC 0x4244 /* "BD": HFS MDB (super block) */
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#define HFS_MFS_SUPER_MAGIC 0xD2D7 /* MFS MDB (super block) */
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/* various FIXED size parameters */
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#define HFS_SECTOR_SIZE 512 /* size of an HFS sector */
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#define HFS_SECTOR_SIZE_BITS 9 /* log_2(HFS_SECTOR_SIZE) */
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#define HFS_NAMELEN 31 /* maximum length of an HFS filename */
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#define HFS_MAX_NAMELEN 128
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#define HFS_MAX_VALENCE 32767U
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/* Meanings of the drAtrb field of the MDB,
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* Reference: _Inside Macintosh: Files_ p. 2-61
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*/
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#define HFS_SB_ATTRIB_HLOCK (1 << 7)
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#define HFS_SB_ATTRIB_UNMNT (1 << 8)
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#define HFS_SB_ATTRIB_SPARED (1 << 9)
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#define HFS_SB_ATTRIB_INCNSTNT (1 << 11)
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#define HFS_SB_ATTRIB_SLOCK (1 << 15)
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/* Some special File ID numbers */
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#define HFS_POR_CNID 1 /* Parent Of the Root */
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#define HFS_ROOT_CNID 2 /* ROOT directory */
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#define HFS_EXT_CNID 3 /* EXTents B-tree */
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#define HFS_CAT_CNID 4 /* CATalog B-tree */
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#define HFS_BAD_CNID 5 /* BAD blocks file */
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#define HFS_ALLOC_CNID 6 /* ALLOCation file (HFS+) */
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#define HFS_START_CNID 7 /* STARTup file (HFS+) */
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#define HFS_ATTR_CNID 8 /* ATTRibutes file (HFS+) */
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#define HFS_EXCH_CNID 15 /* ExchangeFiles temp id */
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#define HFS_FIRSTUSER_CNID 16
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/* values for hfs_cat_rec.cdrType */
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#define HFS_CDR_DIR 0x01 /* folder (directory) */
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#define HFS_CDR_FIL 0x02 /* file */
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#define HFS_CDR_THD 0x03 /* folder (directory) thread */
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#define HFS_CDR_FTH 0x04 /* file thread */
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/* legal values for hfs_ext_key.FkType and hfs_file.fork */
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#define HFS_FK_DATA 0x00
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#define HFS_FK_RSRC 0xFF
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/* bits in hfs_fil_entry.Flags */
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#define HFS_FIL_LOCK 0x01 /* locked */
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#define HFS_FIL_THD 0x02 /* file thread */
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#define HFS_FIL_DOPEN 0x04 /* data fork open */
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#define HFS_FIL_ROPEN 0x08 /* resource fork open */
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#define HFS_FIL_DIR 0x10 /* directory (always clear) */
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#define HFS_FIL_NOCOPY 0x40 /* copy-protected file */
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#define HFS_FIL_USED 0x80 /* open */
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/* bits in hfs_dir_entry.Flags. dirflags is 16 bits. */
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#define HFS_DIR_LOCK 0x01 /* locked */
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#define HFS_DIR_THD 0x02 /* directory thread */
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#define HFS_DIR_INEXPFOLDER 0x04 /* in a shared area */
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#define HFS_DIR_MOUNTED 0x08 /* mounted */
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#define HFS_DIR_DIR 0x10 /* directory (always set) */
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#define HFS_DIR_EXPFOLDER 0x20 /* share point */
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/* bits hfs_finfo.fdFlags */
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#define HFS_FLG_INITED 0x0100
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#define HFS_FLG_LOCKED 0x1000
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#define HFS_FLG_INVISIBLE 0x4000
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/*======== HFS structures as they appear on the disk ========*/
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/* Pascal-style string of up to 31 characters */
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struct hfs_name {
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u8 len;
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u8 name[HFS_NAMELEN];
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} __packed;
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struct hfs_point {
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__be16 v;
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__be16 h;
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} __packed;
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struct hfs_rect {
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__be16 top;
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__be16 left;
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__be16 bottom;
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__be16 right;
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} __packed;
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struct hfs_finfo {
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__be32 fdType;
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__be32 fdCreator;
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__be16 fdFlags;
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struct hfs_point fdLocation;
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__be16 fdFldr;
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} __packed;
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struct hfs_fxinfo {
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__be16 fdIconID;
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u8 fdUnused[8];
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__be16 fdComment;
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__be32 fdPutAway;
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} __packed;
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struct hfs_dinfo {
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struct hfs_rect frRect;
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__be16 frFlags;
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struct hfs_point frLocation;
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__be16 frView;
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} __packed;
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struct hfs_dxinfo {
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struct hfs_point frScroll;
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__be32 frOpenChain;
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__be16 frUnused;
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__be16 frComment;
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__be32 frPutAway;
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} __packed;
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union hfs_finder_info {
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struct {
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struct hfs_finfo finfo;
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struct hfs_fxinfo fxinfo;
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} file;
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struct {
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struct hfs_dinfo dinfo;
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struct hfs_dxinfo dxinfo;
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} dir;
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} __packed;
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/* Cast to a pointer to a generic bkey */
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#define HFS_BKEY(X) (((void)((X)->KeyLen)), ((struct hfs_bkey *)(X)))
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/* The key used in the catalog b-tree: */
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struct hfs_cat_key {
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u8 key_len; /* number of bytes in the key */
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u8 reserved; /* padding */
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__be32 ParID; /* CNID of the parent dir */
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struct hfs_name CName; /* The filename of the entry */
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} __packed;
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/* The key used in the extents b-tree: */
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struct hfs_ext_key {
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u8 key_len; /* number of bytes in the key */
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u8 FkType; /* HFS_FK_{DATA,RSRC} */
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__be32 FNum; /* The File ID of the file */
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__be16 FABN; /* allocation blocks number*/
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} __packed;
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typedef union hfs_btree_key {
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u8 key_len; /* number of bytes in the key */
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struct hfs_cat_key cat;
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struct hfs_ext_key ext;
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} hfs_btree_key;
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typedef union hfs_btree_key btree_key;
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struct hfs_extent {
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__be16 block;
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__be16 count;
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};
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typedef struct hfs_extent hfs_extent_rec[3];
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/* The catalog record for a file */
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struct hfs_cat_file {
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s8 type; /* The type of entry */
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u8 reserved;
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u8 Flags; /* Flags such as read-only */
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s8 Typ; /* file version number = 0 */
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struct hfs_finfo UsrWds; /* data used by the Finder */
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__be32 FlNum; /* The CNID */
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__be16 StBlk; /* obsolete */
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__be32 LgLen; /* The logical EOF of the data fork*/
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__be32 PyLen; /* The physical EOF of the data fork */
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__be16 RStBlk; /* obsolete */
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__be32 RLgLen; /* The logical EOF of the rsrc fork */
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__be32 RPyLen; /* The physical EOF of the rsrc fork */
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__be32 CrDat; /* The creation date */
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__be32 MdDat; /* The modified date */
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__be32 BkDat; /* The last backup date */
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struct hfs_fxinfo FndrInfo; /* more data for the Finder */
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__be16 ClpSize; /* number of bytes to allocate
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when extending files */
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hfs_extent_rec ExtRec; /* first extent record
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for the data fork */
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hfs_extent_rec RExtRec; /* first extent record
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for the resource fork */
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u32 Resrv; /* reserved by Apple */
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} __packed;
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/* the catalog record for a directory */
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struct hfs_cat_dir {
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s8 type; /* The type of entry */
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u8 reserved;
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__be16 Flags; /* flags */
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__be16 Val; /* Valence: number of files and
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dirs in the directory */
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__be32 DirID; /* The CNID */
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__be32 CrDat; /* The creation date */
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__be32 MdDat; /* The modification date */
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__be32 BkDat; /* The last backup date */
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struct hfs_dinfo UsrInfo; /* data used by the Finder */
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struct hfs_dxinfo FndrInfo; /* more data used by Finder */
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u8 Resrv[16]; /* reserved by Apple */
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} __packed;
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/* the catalog record for a thread */
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struct hfs_cat_thread {
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s8 type; /* The type of entry */
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u8 reserved[9]; /* reserved by Apple */
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__be32 ParID; /* CNID of parent directory */
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struct hfs_name CName; /* The name of this entry */
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} __packed;
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/* A catalog tree record */
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typedef union hfs_cat_rec {
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s8 type; /* The type of entry */
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struct hfs_cat_file file;
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struct hfs_cat_dir dir;
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struct hfs_cat_thread thread;
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} hfs_cat_rec;
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struct hfs_mdb {
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__be16 drSigWord; /* Signature word indicating fs type */
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__be32 drCrDate; /* fs creation date/time */
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__be32 drLsMod; /* fs modification date/time */
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__be16 drAtrb; /* fs attributes */
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__be16 drNmFls; /* number of files in root directory */
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__be16 drVBMSt; /* location (in 512-byte blocks)
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of the volume bitmap */
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__be16 drAllocPtr; /* location (in allocation blocks)
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to begin next allocation search */
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__be16 drNmAlBlks; /* number of allocation blocks */
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__be32 drAlBlkSiz; /* bytes in an allocation block */
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__be32 drClpSiz; /* clumpsize, the number of bytes to
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allocate when extending a file */
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__be16 drAlBlSt; /* location (in 512-byte blocks)
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of the first allocation block */
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__be32 drNxtCNID; /* CNID to assign to the next
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file or directory created */
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__be16 drFreeBks; /* number of free allocation blocks */
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u8 drVN[28]; /* the volume label */
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__be32 drVolBkUp; /* fs backup date/time */
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__be16 drVSeqNum; /* backup sequence number */
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__be32 drWrCnt; /* fs write count */
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__be32 drXTClpSiz; /* clumpsize for the extents B-tree */
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__be32 drCTClpSiz; /* clumpsize for the catalog B-tree */
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__be16 drNmRtDirs; /* number of directories in
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the root directory */
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__be32 drFilCnt; /* number of files in the fs */
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__be32 drDirCnt; /* number of directories in the fs */
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u8 drFndrInfo[32]; /* data used by the Finder */
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__be16 drEmbedSigWord; /* embedded volume signature */
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__be32 drEmbedExtent; /* starting block number (xdrStABN)
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and number of allocation blocks
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(xdrNumABlks) occupied by embedded
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volume */
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__be32 drXTFlSize; /* bytes in the extents B-tree */
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hfs_extent_rec drXTExtRec; /* extents B-tree's first 3 extents */
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__be32 drCTFlSize; /* bytes in the catalog B-tree */
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hfs_extent_rec drCTExtRec; /* catalog B-tree's first 3 extents */
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} __packed;
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/*======== Data structures kept in memory ========*/
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struct hfs_readdir_data {
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struct list_head list;
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struct file *file;
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struct hfs_cat_key key;
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};
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#endif
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