linux-imx

/*

 * linux/fs/hfsplus/part_tbl.c

 *

 * Copyright (C) 1996-1997  Paul H. Hargrove

 * This file may be distributed under the terms of

 * the GNU General Public License.

 *

 * Original code to handle the new style Mac partition table based on

 * a patch contributed by Holger Schemel (aeglos@valinor.owl.de).

 *

 * In function preconditions the term "valid" applied to a pointer to

 * a structure means that the pointer is non-NULL and the structure it

 * points to has all fields initialized to consistent values.

 *

 */

​

#include <linux/slab.h>

#include "hfsplus_fs.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) */

​

/*

 * The new style Mac partition map

 *

 * For each partition on the media there is a physical block (512-byte

 * block) containing one of these structures.  These blocks are

 * contiguous starting at block 1.

 */

struct new_pmap {

    __be16  pmSig;      /* signature */

    __be16  reSigPad;   /* padding */

    __be32  pmMapBlkCnt;    /* partition blocks count */

    __be32  pmPyPartStart;  /* physical block start of partition */

    __be32  pmPartBlkCnt;   /* physical block count of partition */

    u8  pmPartName[32]; /* (null terminated?) string

                   giving the name of this

                   partition */

    u8  pmPartType[32]; /* (null terminated?) string

                   giving the type of this

                   partition */

    /* a bunch more stuff we don't need */

} __packed;

​

/*

 * The old style Mac partition map

 *

 * The partition map consists for a 2-byte signature followed by an

 * array of these structures.  The map is terminated with an all-zero

 * one of these.

 */

struct old_pmap {

    __be16      pdSig;  /* Signature bytes */

    struct old_pmap_entry {