mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Christoph Hellwig](/assets/img/avatar_default.png)
Partition scanning only happens on the whole device, so pass a struct gendisk instead of the whole device block_device to the scanners. This allows to simplify printing the device name in various places as the disk name is available in disk->name. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Stefan Haberland <sth@linux.ibm.com> Link: https://lore.kernel.org/r/20210810154512.1809898-2-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
129 lines
3.9 KiB
C
129 lines
3.9 KiB
C
// 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;
|
|
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",
|
|
state->disk->disk_name, 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",
|
|
state->disk->disk_name);
|
|
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;
|
|
}
|