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19d0e8ce85
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>
92 lines
1.8 KiB
C
92 lines
1.8 KiB
C
/*
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* fs/partitions/sysv68.c
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*
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* Copyright (C) 2007 Philippe De Muyter <phdm@macqel.be>
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*/
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#include "check.h"
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#include "sysv68.h"
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/*
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* Volume ID structure: on first 256-bytes sector of disk
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*/
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struct volumeid {
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u8 vid_unused[248];
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u8 vid_mac[8]; /* ASCII string "MOTOROLA" */
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};
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/*
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* config block: second 256-bytes sector on disk
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*/
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struct dkconfig {
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u8 ios_unused0[128];
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__be32 ios_slcblk; /* Slice table block number */
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__be16 ios_slccnt; /* Number of entries in slice table */
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u8 ios_unused1[122];
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};
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/*
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* combined volumeid and dkconfig block
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*/
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struct dkblk0 {
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struct volumeid dk_vid;
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struct dkconfig dk_ios;
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};
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/*
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* Slice Table Structure
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*/
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struct slice {
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__be32 nblocks; /* slice size (in blocks) */
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__be32 blkoff; /* block offset of slice */
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};
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int sysv68_partition(struct parsed_partitions *state, struct block_device *bdev)
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{
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int i, slices;
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int slot = 1;
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Sector sect;
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unsigned char *data;
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struct dkblk0 *b;
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struct slice *slice;
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data = read_dev_sector(bdev, 0, §);
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if (!data)
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return -1;
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b = (struct dkblk0 *)data;
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if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) {
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put_dev_sector(sect);
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return 0;
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}
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slices = be16_to_cpu(b->dk_ios.ios_slccnt);
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i = be32_to_cpu(b->dk_ios.ios_slcblk);
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put_dev_sector(sect);
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data = read_dev_sector(bdev, i, §);
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if (!data)
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return -1;
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slices -= 1; /* last slice is the whole disk */
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printk("sysV68: %s(s%u)", state->name, slices);
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slice = (struct slice *)data;
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for (i = 0; i < slices; i++, slice++) {
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if (slot == state->limit)
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break;
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if (be32_to_cpu(slice->nblocks)) {
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put_partition(state, slot,
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be32_to_cpu(slice->blkoff),
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be32_to_cpu(slice->nblocks));
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printk("(s%u)", i);
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}
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slot++;
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}
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printk("\n");
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put_dev_sector(sect);
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return 1;
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}
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