mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-01 16:14:13 +08:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/*
|
|
* 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, struct block_device *bdev)
|
|
{
|
|
int i;
|
|
__be16 csum;
|
|
int slot = 1;
|
|
__be16 *ush;
|
|
Sector sect;
|
|
struct sun_disklabel {
|
|
unsigned char info[128]; /* Informative text string */
|
|
unsigned char spare0[14];
|
|
struct sun_info {
|
|
unsigned char spare1;
|
|
unsigned char id;
|
|
unsigned char spare2;
|
|
unsigned char flags;
|
|
} infos[8];
|
|
unsigned char spare[246]; /* Boot information etc. */
|
|
__be16 rspeed; /* Disk rotational speed */
|
|
__be16 pcylcount; /* Physical cylinder count */
|
|
__be16 sparecyl; /* extra sects per cylinder */
|
|
unsigned char spare2[4]; /* More magic... */
|
|
__be16 ilfact; /* Interleave factor */
|
|
__be16 ncyl; /* Data cylinder count */
|
|
__be16 nacyl; /* Alt. cylinder count */
|
|
__be16 ntrks; /* Tracks per cylinder */
|
|
__be16 nsect; /* Sectors per track */
|
|
unsigned char spare3[4]; /* Even more magic... */
|
|
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];
|
|
|
|
label = (struct sun_disklabel *)read_dev_sector(bdev, 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(bdev, b));
|
|
put_dev_sector(sect);
|
|
return 0;
|
|
}
|
|
|
|
/* All Sun disks have 8 partition entries */
|
|
spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
|
|
for (i = 0; i < 8; i++, p++) {
|
|
unsigned long st_sector;
|
|
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);
|
|
if (label->infos[i].id == LINUX_RAID_PARTITION)
|
|
state->parts[slot].flags = 1;
|
|
}
|
|
slot++;
|
|
}
|
|
printk("\n");
|
|
put_dev_sector(sect);
|
|
return 1;
|
|
}
|