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1// SPDX-License-Identifier: GPL-2.02/*3 * fs/partitions/sun.c4 *5 * Code extracted from drivers/block/genhd.c6 *7 * Copyright (C) 1991-1998 Linus Torvalds8 * Re-organised Feb 1998 Russell King9 */10 11#include "check.h"12 13#define SUN_LABEL_MAGIC 0xDABE14#define SUN_VTOC_SANITY 0x600DDEEE15 16enum {17 SUN_WHOLE_DISK = 5,18 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */19};20 21int sun_partition(struct parsed_partitions *state)22{23 int i;24 __be16 csum;25 int slot = 1;26 __be16 *ush;27 Sector sect;28 struct sun_disklabel {29 unsigned char info[128]; /* Informative text string */30 struct sun_vtoc {31 __be32 version; /* Layout version */32 char volume[8]; /* Volume name */33 __be16 nparts; /* Number of partitions */34 struct sun_info { /* Partition hdrs, sec 2 */35 __be16 id;36 __be16 flags;37 } infos[8];38 __be16 padding; /* Alignment padding */39 __be32 bootinfo[3]; /* Info needed by mboot */40 __be32 sanity; /* To verify vtoc sanity */41 __be32 reserved[10]; /* Free space */42 __be32 timestamp[8]; /* Partition timestamp */43 } vtoc;44 __be32 write_reinstruct; /* sectors to skip, writes */45 __be32 read_reinstruct; /* sectors to skip, reads */46 unsigned char spare[148]; /* Padding */47 __be16 rspeed; /* Disk rotational speed */48 __be16 pcylcount; /* Physical cylinder count */49 __be16 sparecyl; /* extra sects per cylinder */50 __be16 obs1; /* gap1 */51 __be16 obs2; /* gap2 */52 __be16 ilfact; /* Interleave factor */53 __be16 ncyl; /* Data cylinder count */54 __be16 nacyl; /* Alt. cylinder count */55 __be16 ntrks; /* Tracks per cylinder */56 __be16 nsect; /* Sectors per track */57 __be16 obs3; /* bhead - Label head offset */58 __be16 obs4; /* ppart - Physical Partition */59 struct sun_partition {60 __be32 start_cylinder;61 __be32 num_sectors;62 } partitions[8];63 __be16 magic; /* Magic number */64 __be16 csum; /* Label xor'd checksum */65 } * label;66 struct sun_partition *p;67 unsigned long spc;68 int use_vtoc;69 int nparts;70 71 label = read_part_sector(state, 0, §);72 if (!label)73 return -1;74 75 p = label->partitions;76 if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {77/* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",78 state->disk->disk_name, be16_to_cpu(label->magic)); */79 put_dev_sector(sect);80 return 0;81 }82 /* Look at the checksum */83 ush = ((__be16 *) (label+1)) - 1;84 for (csum = 0; ush >= ((__be16 *) label);)85 csum ^= *ush--;86 if (csum) {87 printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",88 state->disk->disk_name);89 put_dev_sector(sect);90 return 0;91 }92 93 /* Check to see if we can use the VTOC table */94 use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) &&95 (be32_to_cpu(label->vtoc.version) == 1) &&96 (be16_to_cpu(label->vtoc.nparts) <= 8));97 98 /* Use 8 partition entries if not specified in validated VTOC */99 nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8;100 101 /*102 * So that old Linux-Sun partitions continue to work,103 * alow the VTOC to be used under the additional condition ...104 */105 use_vtoc = use_vtoc || !(label->vtoc.sanity ||106 label->vtoc.version || label->vtoc.nparts);107 spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);108 for (i = 0; i < nparts; i++, p++) {109 unsigned long st_sector;110 unsigned int num_sectors;111 112 st_sector = be32_to_cpu(p->start_cylinder) * spc;113 num_sectors = be32_to_cpu(p->num_sectors);114 if (num_sectors) {115 put_partition(state, slot, st_sector, num_sectors);116 state->parts[slot].flags = 0;117 if (use_vtoc) {118 if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION)119 state->parts[slot].flags |= ADDPART_FLAG_RAID;120 else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK)121 state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;122 }123 }124 slot++;125 }126 strlcat(state->pp_buf, "\n", PAGE_SIZE);127 put_dev_sector(sect);128 return 1;129}130