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partition: add support for sysv68 partitions

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Add support for the Motorola sysv68 disk partition (slices in motorola
doc).

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Philippe De Muyter 2007-05-08 00:29:15 -07:00 committed by Linus Torvalds
parent e729aa16b1
commit 19d0e8ce85
5 changed files with 107 additions and 0 deletions
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9
fs/partitions/Kconfig
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@ -236,3 +236,12 @@ config EFI_PARTITION
help
Say Y here if you would like to use hard disks under Linux which
were partitioned using EFI GPT.
config SYSV68_PARTITION
bool "SYSV68 partition table support" if PARTITION_ADVANCED
default y if M68K
help
Say Y here if you would like to be able to read the hard disk
partition table format used by Motorola Delta machines (using
sysv68).
Otherwise, say N.

1
fs/partitions/Makefile
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@ -17,3 +17,4 @@ obj-$(CONFIG_ULTRIX_PARTITION) += ultrix.o
obj-$(CONFIG_IBM_PARTITION) += ibm.o
obj-$(CONFIG_EFI_PARTITION) += efi.o
obj-$(CONFIG_KARMA_PARTITION) += karma.o
obj-$(CONFIG_SYSV68_PARTITION) += sysv68.o

4
fs/partitions/check.c
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@ -34,6 +34,7 @@
#include "ultrix.h"
#include "efi.h"
#include "karma.h"
#include "sysv68.h"
#ifdef CONFIG_BLK_DEV_MD
extern void md_autodetect_dev(dev_t dev);
@ -104,6 +105,9 @@ static int (*check_part[])(struct parsed_partitions *, struct block_device *) =
#endif
#ifdef CONFIG_KARMA_PARTITION
karma_partition,
#endif
#ifdef CONFIG_SYSV68_PARTITION
sysv68_partition,
#endif
NULL
};

92
fs/partitions/sysv68.c Normal file
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@ -0,0 +1,92 @@
/*
* fs/partitions/sysv68.c
*
* Copyright (C) 2007 Philippe De Muyter <phdm@macqel.be>
*/
#include "check.h"
#include "sysv68.h"
/*
* Volume ID structure: on first 256-bytes sector of disk
*/
struct volumeid {
u8 vid_unused[248];
u8 vid_mac[8]; /* ASCII string "MOTOROLA" */
};
/*
* config block: second 256-bytes sector on disk
*/
struct dkconfig {
u8 ios_unused0[128];
__be32 ios_slcblk; /* Slice table block number */
__be16 ios_slccnt; /* Number of entries in slice table */
u8 ios_unused1[122];
};
/*
* combined volumeid and dkconfig block
*/
struct dkblk0 {
struct volumeid dk_vid;
struct dkconfig dk_ios;
};
/*
* Slice Table Structure
*/
struct slice {
__be32 nblocks; /* slice size (in blocks) */
__be32 blkoff; /* block offset of slice */
};
int sysv68_partition(struct parsed_partitions *state, struct block_device *bdev)
{
int i, slices;
int slot = 1;
Sector sect;
unsigned char *data;
struct dkblk0 *b;
struct slice *slice;
data = read_dev_sector(bdev, 0, &sect);
if (!data)
return -1;
b = (struct dkblk0 *)data;
if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) {
put_dev_sector(sect);
return 0;
}
slices = be16_to_cpu(b->dk_ios.ios_slccnt);
i = be32_to_cpu(b->dk_ios.ios_slcblk);
put_dev_sector(sect);
data = read_dev_sector(bdev, i, &sect);
if (!data)
return -1;
slices -= 1; /* last slice is the whole disk */
printk("sysV68: %s(s%u)", state->name, slices);
slice = (struct slice *)data;
for (i = 0; i < slices; i++, slice++) {
if (slot == state->limit)
break;
if (be32_to_cpu(slice->nblocks)) {
put_partition(state, slot,
be32_to_cpu(slice->blkoff),
be32_to_cpu(slice->nblocks));
printk("(s%u)", i);
}
slot++;
}
printk("\n");
put_dev_sector(sect);
return 1;
}

1
fs/partitions/sysv68.h Normal file
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@ -0,0 +1 @@
extern int sysv68_partition(struct parsed_partitions *state, struct block_device *bdev);