mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
130 lines
3.9 KiB
130 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* 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" |
|
|
|
#define SUN_LABEL_MAGIC 0xDABE |
|
#define SUN_VTOC_SANITY 0x600DDEEE |
|
|
|
enum { |
|
SUN_WHOLE_DISK = 5, |
|
LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ |
|
}; |
|
|
|
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; |
|
}
|
|
|