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SubjectRe: [patch] IDE OnTrack remap for 2.5.58

Jim,

The remapping mess was ripped out in 2.5.
I do not want it back.
Remove your overlay junk on the drive and use it normal mode.

Cheers,

On Thu, 16 Jan 2003, Jim Houston wrote:

>
> Hi Everyone,
>
> I'm running a Seagate 80 GB disk in an old Pentium Pro dual processor.
> I installed the current Redhat (phoebe) beta, and it works fine until
> I try to boot a 2.5.58 kernel. It fails to mount the root disk because
> the disk has been setup with OnTrack remaping. I didn't do anything
> to ask for this remapping. Perhaps Seagate is shipping with this pre-
> installed?
>
> I went back and looked through the patches and found that the remapping
> support was removed in patch-2.5.30. The comments in the mailing list
> suggest that it belonged in user space. I have not found code/instructions
> on how to do this. Since then, most of IDE code has been reverted to the
> 2.4 versions but not this bit.
>
> The attached patch is just the bit of code which was removed in 2.5.30
> with the obvious changes needed to make it work in a 2.5.58 kernel.
> I have a dream of upgrading my test machine to something clean and modern
> unpolluted by backwards compatible cruft. Until then, this bit of code
> doesn't seem too bad.
>
> Jim Houston - Concurrent Computer Corp.
>
>
> --- linux-2.5.58.orig/fs/partitions/msdos.c Thu Jan 16 11:56:13 2003
> +++ linux-2.5.58/fs/partitions/msdos.c Wed Jan 15 17:32:22 2003
> @@ -385,6 +385,87 @@
> {SOLARIS_X86_PARTITION, parse_solaris_x86},
> {0, NULL},
> };
> +/*
> + * Look for various forms of IDE disk geometry translation
> + */
> +static int handle_ide_mess(struct block_device *bdev)
> +{
> +#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
> + Sector sect;
> + unsigned char *data;
> + kdev_t dev = to_kdev_t(bdev->bd_dev);
> + unsigned int sig;
> + int heads = 0;
> + struct partition *p;
> + int i;
> +#ifdef CONFIG_BLK_DEV_IDE_MODULE
> + if (!ide_xlate_1024)
> + return 1;
> +#endif
> + /*
> + * The i386 partition handling programs very often
> + * make partitions end on cylinder boundaries.
> + * There is no need to do so, and Linux fdisk doesn't always
> + * do this, and Windows NT on Alpha doesn't do this either,
> + * but still, this helps to guess #heads.
> + */
> + data = read_dev_sector(bdev, 0, &sect);
> + if (!data)
> + return -1;
> + if (!msdos_magic_present(data + 510)) {
> + put_dev_sector(sect);
> + return 0;
> + }
> + sig = le16_to_cpu(*(unsigned short *)(data + 2));
> + p = (struct partition *) (data + 0x1be);
> + for (i = 0; i < 4; i++) {
> + struct partition *q = &p[i];
> + if (NR_SECTS(q)) {
> + if ((q->sector & 63) == 1 &&
> + (q->end_sector & 63) == 63)
> + heads = q->end_head + 1;
> + break;
> + }
> + }
> + if (SYS_IND(p) == EZD_PARTITION) {
> + /*
> + * Accesses to sector 0 must go to sector 1 instead.
> + */
> + if (ide_xlate_1024(bdev, -1, heads, " [EZD]"))
> + goto reread;
> + } else if (SYS_IND(p) == DM6_PARTITION) {
> +
> + /*
> + * Everything on the disk is offset by 63 sectors,
> + * including a "new" MBR with its own partition table.
> + */
> + if (ide_xlate_1024(bdev, 1, heads, " [DM6:DDO]"))
> + goto reread;
> + } else if (sig <= 0x1ae &&
> + data[sig] == 0xAA && data[sig+1] == 0x55 &&
> + (data[sig+2] & 1)) {
> + /* DM6 signature in MBR, courtesy of OnTrack */
> + (void) ide_xlate_1024 (bdev, 0, heads, " [DM6:MBR]");
> + } else if (SYS_IND(p) == DM6_AUX1PARTITION ||
> + SYS_IND(p) == DM6_AUX3PARTITION) {
> + /*
> + * DM6 on other than the first (boot) drive
> + */
> + (void) ide_xlate_1024(bdev, 0, heads, " [DM6:AUX]");
> + } else {
> + (void) ide_xlate_1024(bdev, 2, heads, " [PTBL]");
> + }
> + put_dev_sector(sect);
> + return 1;
> +
> +reread:
> + put_dev_sector(sect);
> + /* Flush the cache */
> + invalidate_bdev(bdev, 1);
> + truncate_inode_pages(bdev->bd_inode->i_mapping, 0);
> +#endif /* defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE) */
> + return 1;
> +}
>
> int msdos_partition(struct parsed_partitions *state, struct block_device *bdev)
> {
> @@ -393,7 +474,11 @@
> unsigned char *data;
> struct partition *p;
> int slot;
> + int err;
>
> + err = handle_ide_mess(bdev);
> + if (err <= 0)
> + return err;
> data = read_dev_sector(bdev, 0, &sect);
> if (!data)
> return -1;
> @@ -439,6 +524,21 @@
> state->parts[slot].flags = 1;
> }
>
> + /*
> + * Check for old-style Disk Manager partition table
> + */
> + if (msdos_magic_present(data + 0xfc)) {
> + p = (struct partition *) (0x1be + data);
> + for (slot = 4 ; slot < 16 ; slot++, state->next++) {
> + p--;
> + if (state->next == state->limit)
> + break;
> + if (!(START_SECT(p) && NR_SECTS(p)))
> + continue;
> + put_partition(state, state->next,
> + START_SECT(p), NR_SECTS(p));
> + }
> + }
> printk("\n");
>
> /* second pass - output for each on a separate line */
> @@ -456,7 +556,7 @@
> if (!subtypes[n].parse)
> continue;
> subtypes[n].parse(state, bdev, START_SECT(p)*sector_size,
> - NR_SECTS(p)*sector_size, slot);
> + NR_SECTS(p)*sector_size, n);
> }
> put_dev_sector(sect);
> return 1;
> -
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> Please read the FAQ at http://www.tux.org/lkml/
>

Andre Hedrick
LAD Storage Consulting Group

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