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