131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* fs/partitions/sun.c
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*
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* Code extracted from drivers/block/genhd.c
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*
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* Copyright (C) 1991-1998 Linus Torvalds
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* Re-organised Feb 1998 Russell King
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*/
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#include "check.h"
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#define SUN_LABEL_MAGIC 0xDABE
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#define SUN_VTOC_SANITY 0x600DDEEE
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enum {
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SUN_WHOLE_DISK = 5,
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LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
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};
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int sun_partition(struct parsed_partitions *state)
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{
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int i;
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__be16 csum;
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int slot = 1;
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__be16 *ush;
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Sector sect;
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struct sun_disklabel {
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unsigned char info[128]; /* Informative text string */
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struct sun_vtoc {
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__be32 version; /* Layout version */
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char volume[8]; /* Volume name */
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__be16 nparts; /* Number of partitions */
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struct sun_info { /* Partition hdrs, sec 2 */
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__be16 id;
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__be16 flags;
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} infos[8];
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__be16 padding; /* Alignment padding */
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__be32 bootinfo[3]; /* Info needed by mboot */
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__be32 sanity; /* To verify vtoc sanity */
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__be32 reserved[10]; /* Free space */
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__be32 timestamp[8]; /* Partition timestamp */
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} vtoc;
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__be32 write_reinstruct; /* sectors to skip, writes */
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__be32 read_reinstruct; /* sectors to skip, reads */
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unsigned char spare[148]; /* Padding */
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__be16 rspeed; /* Disk rotational speed */
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__be16 pcylcount; /* Physical cylinder count */
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__be16 sparecyl; /* extra sects per cylinder */
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__be16 obs1; /* gap1 */
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__be16 obs2; /* gap2 */
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__be16 ilfact; /* Interleave factor */
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__be16 ncyl; /* Data cylinder count */
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__be16 nacyl; /* Alt. cylinder count */
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__be16 ntrks; /* Tracks per cylinder */
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__be16 nsect; /* Sectors per track */
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__be16 obs3; /* bhead - Label head offset */
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__be16 obs4; /* ppart - Physical Partition */
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struct sun_partition {
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__be32 start_cylinder;
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__be32 num_sectors;
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} partitions[8];
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__be16 magic; /* Magic number */
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__be16 csum; /* Label xor'd checksum */
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} * label;
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struct sun_partition *p;
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unsigned long spc;
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char b[BDEVNAME_SIZE];
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int use_vtoc;
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int nparts;
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label = read_part_sector(state, 0, §);
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if (!label)
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return -1;
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p = label->partitions;
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if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
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/* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
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bdevname(bdev, b), be16_to_cpu(label->magic)); */
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put_dev_sector(sect);
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return 0;
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}
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/* Look at the checksum */
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ush = ((__be16 *) (label+1)) - 1;
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for (csum = 0; ush >= ((__be16 *) label);)
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csum ^= *ush--;
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if (csum) {
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printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
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bdevname(state->bdev, b));
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put_dev_sector(sect);
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return 0;
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}
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/* Check to see if we can use the VTOC table */
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use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) &&
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(be32_to_cpu(label->vtoc.version) == 1) &&
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(be16_to_cpu(label->vtoc.nparts) <= 8));
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/* Use 8 partition entries if not specified in validated VTOC */
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nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8;
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/*
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* So that old Linux-Sun partitions continue to work,
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* alow the VTOC to be used under the additional condition ...
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*/
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use_vtoc = use_vtoc || !(label->vtoc.sanity ||
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label->vtoc.version || label->vtoc.nparts);
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spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
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for (i = 0; i < nparts; i++, p++) {
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unsigned long st_sector;
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unsigned int num_sectors;
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st_sector = be32_to_cpu(p->start_cylinder) * spc;
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num_sectors = be32_to_cpu(p->num_sectors);
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if (num_sectors) {
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put_partition(state, slot, st_sector, num_sectors);
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state->parts[slot].flags = 0;
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if (use_vtoc) {
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if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION)
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state->parts[slot].flags |= ADDPART_FLAG_RAID;
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else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK)
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state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;
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}
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}
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slot++;
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}
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strlcat(state->pp_buf, "\n", PAGE_SIZE);
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put_dev_sector(sect);
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return 1;
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}
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