| 1 |
62 |
marcus.erl |
/*
|
| 2 |
|
|
* fs/partitions/sun.c
|
| 3 |
|
|
*
|
| 4 |
|
|
* Code extracted from drivers/block/genhd.c
|
| 5 |
|
|
*
|
| 6 |
|
|
* Copyright (C) 1991-1998 Linus Torvalds
|
| 7 |
|
|
* Re-organised Feb 1998 Russell King
|
| 8 |
|
|
*/
|
| 9 |
|
|
|
| 10 |
|
|
#include "check.h"
|
| 11 |
|
|
#include "sun.h"
|
| 12 |
|
|
|
| 13 |
|
|
int sun_partition(struct parsed_partitions *state, struct block_device *bdev)
|
| 14 |
|
|
{
|
| 15 |
|
|
int i;
|
| 16 |
|
|
__be16 csum;
|
| 17 |
|
|
int slot = 1;
|
| 18 |
|
|
__be16 *ush;
|
| 19 |
|
|
Sector sect;
|
| 20 |
|
|
struct sun_disklabel {
|
| 21 |
|
|
unsigned char info[128]; /* Informative text string */
|
| 22 |
|
|
struct sun_vtoc {
|
| 23 |
|
|
__be32 version; /* Layout version */
|
| 24 |
|
|
char volume[8]; /* Volume name */
|
| 25 |
|
|
__be16 nparts; /* Number of partitions */
|
| 26 |
|
|
struct sun_info { /* Partition hdrs, sec 2 */
|
| 27 |
|
|
__be16 id;
|
| 28 |
|
|
__be16 flags;
|
| 29 |
|
|
} infos[8];
|
| 30 |
|
|
__be16 padding; /* Alignment padding */
|
| 31 |
|
|
__be32 bootinfo[3]; /* Info needed by mboot */
|
| 32 |
|
|
__be32 sanity; /* To verify vtoc sanity */
|
| 33 |
|
|
__be32 reserved[10]; /* Free space */
|
| 34 |
|
|
__be32 timestamp[8]; /* Partition timestamp */
|
| 35 |
|
|
} vtoc;
|
| 36 |
|
|
__be32 write_reinstruct; /* sectors to skip, writes */
|
| 37 |
|
|
__be32 read_reinstruct; /* sectors to skip, reads */
|
| 38 |
|
|
unsigned char spare[148]; /* Padding */
|
| 39 |
|
|
__be16 rspeed; /* Disk rotational speed */
|
| 40 |
|
|
__be16 pcylcount; /* Physical cylinder count */
|
| 41 |
|
|
__be16 sparecyl; /* extra sects per cylinder */
|
| 42 |
|
|
__be16 obs1; /* gap1 */
|
| 43 |
|
|
__be16 obs2; /* gap2 */
|
| 44 |
|
|
__be16 ilfact; /* Interleave factor */
|
| 45 |
|
|
__be16 ncyl; /* Data cylinder count */
|
| 46 |
|
|
__be16 nacyl; /* Alt. cylinder count */
|
| 47 |
|
|
__be16 ntrks; /* Tracks per cylinder */
|
| 48 |
|
|
__be16 nsect; /* Sectors per track */
|
| 49 |
|
|
__be16 obs3; /* bhead - Label head offset */
|
| 50 |
|
|
__be16 obs4; /* ppart - Physical Partition */
|
| 51 |
|
|
struct sun_partition {
|
| 52 |
|
|
__be32 start_cylinder;
|
| 53 |
|
|
__be32 num_sectors;
|
| 54 |
|
|
} partitions[8];
|
| 55 |
|
|
__be16 magic; /* Magic number */
|
| 56 |
|
|
__be16 csum; /* Label xor'd checksum */
|
| 57 |
|
|
} * label;
|
| 58 |
|
|
struct sun_partition *p;
|
| 59 |
|
|
unsigned long spc;
|
| 60 |
|
|
char b[BDEVNAME_SIZE];
|
| 61 |
|
|
int use_vtoc;
|
| 62 |
|
|
int nparts;
|
| 63 |
|
|
|
| 64 |
|
|
label = (struct sun_disklabel *)read_dev_sector(bdev, 0, §);
|
| 65 |
|
|
if (!label)
|
| 66 |
|
|
return -1;
|
| 67 |
|
|
|
| 68 |
|
|
p = label->partitions;
|
| 69 |
|
|
if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
|
| 70 |
|
|
/* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
|
| 71 |
|
|
bdevname(bdev, b), be16_to_cpu(label->magic)); */
|
| 72 |
|
|
put_dev_sector(sect);
|
| 73 |
|
|
return 0;
|
| 74 |
|
|
}
|
| 75 |
|
|
/* Look at the checksum */
|
| 76 |
|
|
ush = ((__be16 *) (label+1)) - 1;
|
| 77 |
|
|
for (csum = 0; ush >= ((__be16 *) label);)
|
| 78 |
|
|
csum ^= *ush--;
|
| 79 |
|
|
if (csum) {
|
| 80 |
|
|
printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
|
| 81 |
|
|
bdevname(bdev, b));
|
| 82 |
|
|
put_dev_sector(sect);
|
| 83 |
|
|
return 0;
|
| 84 |
|
|
}
|
| 85 |
|
|
|
| 86 |
|
|
/* Check to see if we can use the VTOC table */
|
| 87 |
|
|
use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) &&
|
| 88 |
|
|
(be32_to_cpu(label->vtoc.version) == 1) &&
|
| 89 |
|
|
(be16_to_cpu(label->vtoc.nparts) <= 8));
|
| 90 |
|
|
|
| 91 |
|
|
/* Use 8 partition entries if not specified in validated VTOC */
|
| 92 |
|
|
nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8;
|
| 93 |
|
|
|
| 94 |
|
|
/*
|
| 95 |
|
|
* So that old Linux-Sun partitions continue to work,
|
| 96 |
|
|
* alow the VTOC to be used under the additional condition ...
|
| 97 |
|
|
*/
|
| 98 |
|
|
use_vtoc = use_vtoc || !(label->vtoc.sanity ||
|
| 99 |
|
|
label->vtoc.version || label->vtoc.nparts);
|
| 100 |
|
|
spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
|
| 101 |
|
|
for (i = 0; i < nparts; i++, p++) {
|
| 102 |
|
|
unsigned long st_sector;
|
| 103 |
|
|
unsigned int num_sectors;
|
| 104 |
|
|
|
| 105 |
|
|
st_sector = be32_to_cpu(p->start_cylinder) * spc;
|
| 106 |
|
|
num_sectors = be32_to_cpu(p->num_sectors);
|
| 107 |
|
|
if (num_sectors) {
|
| 108 |
|
|
put_partition(state, slot, st_sector, num_sectors);
|
| 109 |
|
|
state->parts[slot].flags = 0;
|
| 110 |
|
|
if (use_vtoc) {
|
| 111 |
|
|
if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION)
|
| 112 |
|
|
state->parts[slot].flags |= ADDPART_FLAG_RAID;
|
| 113 |
|
|
else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK)
|
| 114 |
|
|
state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;
|
| 115 |
|
|
}
|
| 116 |
|
|
}
|
| 117 |
|
|
slot++;
|
| 118 |
|
|
}
|
| 119 |
|
|
printk("\n");
|
| 120 |
|
|
put_dev_sector(sect);
|
| 121 |
|
|
return 1;
|
| 122 |
|
|
}
|
