1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/*
|
|
* linux/fs/hfs/part_tbl.c
|
|
*
|
|
* Copyright (C) 1996-1997 Paul H. Hargrove
|
|
* (C) 2003 Ardis Technologies <roman@ardistech.com>
|
|
* This file may be distributed under the terms of the GNU General Public License.
|
|
*
|
|
* Original code to handle the new style Mac partition table based on
|
|
* a patch contributed by Holger Schemel (aeglos@valinor.owl.de).
|
|
*/
|
|
|
|
#include "hfs_fs.h"
|
|
|
|
/*
|
|
* 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 {
|
|
__be32 pdStart;
|
|
__be32 pdSize;
|
|
__be32 pdFSID;
|
|
} pdEntry[42];
|
|
} __packed;
|
|
|
|
/*
|
|
* hfs_part_find()
|
|
*
|
|
* Parse the partition map looking for the
|
|
* start and length of the 'part'th HFS partition.
|
|
*/
|
|
int hfs_part_find(struct super_block *sb,
|
|
sector_t *part_start, sector_t *part_size)
|
|
{
|
|
struct buffer_head *bh;
|
|
__be16 *data;
|
|
int i, size, res;
|
|
|
|
res = -ENOENT;
|
|
bh = sb_bread512(sb, *part_start + HFS_PMAP_BLK, data);
|
|
if (!bh)
|
|
return -EIO;
|
|
|
|
switch (be16_to_cpu(*data)) {
|
|
case HFS_OLD_PMAP_MAGIC:
|
|
{
|
|
struct old_pmap *pm;
|
|
struct old_pmap_entry *p;
|
|
|
|
pm = (struct old_pmap *)bh->b_data;
|
|
p = pm->pdEntry;
|
|
size = 42;
|
|
for (i = 0; i < size; p++, i++) {
|
|
if (p->pdStart && p->pdSize &&
|
|
p->pdFSID == cpu_to_be32(0x54465331)/*"TFS1"*/ &&
|
|
(HFS_SB(sb)->part < 0 || HFS_SB(sb)->part == i)) {
|
|
*part_start += be32_to_cpu(p->pdStart);
|
|
*part_size = be32_to_cpu(p->pdSize);
|
|
res = 0;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case HFS_NEW_PMAP_MAGIC:
|
|
{
|
|
struct new_pmap *pm;
|
|
|
|
pm = (struct new_pmap *)bh->b_data;
|
|
size = be32_to_cpu(pm->pmMapBlkCnt);
|
|
for (i = 0; i < size;) {
|
|
if (!memcmp(pm->pmPartType,"Apple_HFS", 9) &&
|
|
(HFS_SB(sb)->part < 0 || HFS_SB(sb)->part == i)) {
|
|
*part_start += be32_to_cpu(pm->pmPyPartStart);
|
|
*part_size = be32_to_cpu(pm->pmPartBlkCnt);
|
|
res = 0;
|
|
break;
|
|
}
|
|
brelse(bh);
|
|
bh = sb_bread512(sb, *part_start + HFS_PMAP_BLK + ++i, pm);
|
|
if (!bh)
|
|
return -EIO;
|
|
if (pm->pmSig != cpu_to_be16(HFS_NEW_PMAP_MAGIC))
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
brelse(bh);
|
|
|
|
return res;
|
|
}
|