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