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linux/fs/partitions/acorn.c
Tejun Heo 1493bf217f block: use struct parsed_partitions *state universally in partition check code 
Make the following changes to partition check code.

* Add ->bdev to struct parsed_partitions.

* Introduce read_part_sector() which is a simple wrapper around
  read_dev_sector() which takes struct parsed_partitions *state
  instead of @bdev.

* For functions which used to take @state and @bdev, drop @bdev.  For
  functions which used to take @bdev, replace it with @state.

* While updating, drop superflous checks on NULL state/bdev in ldm.c.

This cleans up the API a bit and enables better handling of IO errors
during partition check as the generic partition check code now has
much better visibility into what went wrong in the low level code
paths.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ben Hutchings <ben@decadent.org.uk>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2010-05-21 20:01:02 +02:00

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/*
* linux/fs/partitions/acorn.c
*
* Copyright (c) 1996-2000 Russell King.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Scan ADFS partitions on hard disk drives. Unfortunately, there
* isn't a standard for partitioning drives on Acorn machines, so
* every single manufacturer of SCSI and IDE cards created their own
* method.
*/
#include <linux/buffer_head.h>
#include <linux/adfs_fs.h>
#include "check.h"
#include "acorn.h"
/*
* Partition types. (Oh for reusability)
*/
#define PARTITION_RISCIX_MFM 1
#define PARTITION_RISCIX_SCSI 2
#define PARTITION_LINUX 9
#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
defined(CONFIG_ACORN_PARTITION_ADFS)
static struct adfs_discrecord *
adfs_partition(struct parsed_partitions *state, char *name, char *data,
unsigned long first_sector, int slot)
{
struct adfs_discrecord *dr;
unsigned int nr_sects;
if (adfs_checkbblk(data))
return NULL;
dr = (struct adfs_discrecord *)(data + 0x1c0);
if (dr->disc_size == 0 && dr->disc_size_high == 0)
return NULL;
nr_sects = (le32_to_cpu(dr->disc_size_high) << 23) |
(le32_to_cpu(dr->disc_size) >> 9);
if (name)
printk(" [%s]", name);
put_partition(state, slot, first_sector, nr_sects);
return dr;
}
#endif
#ifdef CONFIG_ACORN_PARTITION_RISCIX
struct riscix_part {
__le32 start;
__le32 length;
__le32 one;
char name[16];
};
struct riscix_record {
__le32 magic;
#define RISCIX_MAGIC cpu_to_le32(0x4a657320)
__le32 date;
struct riscix_part part[8];
};
#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
defined(CONFIG_ACORN_PARTITION_ADFS)
static int riscix_partition(struct parsed_partitions *state,
unsigned long first_sect, int slot,
unsigned long nr_sects)
{
Sector sect;
struct riscix_record *rr;
rr = read_part_sector(state, first_sect, &sect);
if (!rr)
return -1;
printk(" [RISCiX]");
if (rr->magic == RISCIX_MAGIC) {
unsigned long size = nr_sects > 2 ? 2 : nr_sects;
int part;
printk(" <");
put_partition(state, slot++, first_sect, size);
for (part = 0; part < 8; part++) {
if (rr->part[part].one &&
memcmp(rr->part[part].name, "All\0", 4)) {
put_partition(state, slot++,
le32_to_cpu(rr->part[part].start),
le32_to_cpu(rr->part[part].length));
printk("(%s)", rr->part[part].name);
}
}
printk(" >\n");
} else {
put_partition(state, slot++, first_sect, nr_sects);
}
put_dev_sector(sect);
return slot;
}
#endif
#endif
#define LINUX_NATIVE_MAGIC 0xdeafa1de
#define LINUX_SWAP_MAGIC 0xdeafab1e
struct linux_part {
__le32 magic;
__le32 start_sect;
__le32 nr_sects;
};
#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
defined(CONFIG_ACORN_PARTITION_ADFS)
static int linux_partition(struct parsed_partitions *state,
unsigned long first_sect, int slot,
unsigned long nr_sects)
{
Sector sect;
struct linux_part *linuxp;
unsigned long size = nr_sects > 2 ? 2 : nr_sects;
printk(" [Linux]");
put_partition(state, slot++, first_sect, size);
linuxp = read_part_sector(state, first_sect, &sect);
if (!linuxp)
return -1;
printk(" <");
while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) ||
linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) {
if (slot == state->limit)
break;
put_partition(state, slot++, first_sect +
le32_to_cpu(linuxp->start_sect),
le32_to_cpu(linuxp->nr_sects));
linuxp ++;
}
printk(" >");
put_dev_sector(sect);
return slot;
}
#endif
#ifdef CONFIG_ACORN_PARTITION_CUMANA
int adfspart_check_CUMANA(struct parsed_partitions *state)
{
unsigned long first_sector = 0;
unsigned int start_blk = 0;
Sector sect;
unsigned char *data;
char *name = "CUMANA/ADFS";
int first = 1;
int slot = 1;
/*
* Try Cumana style partitions - sector 6 contains ADFS boot block
* with pointer to next 'drive'.
*
* There are unknowns in this code - is the 'cylinder number' of the
* next partition relative to the start of this one - I'm assuming
* it is.
*
* Also, which ID did Cumana use?
*
* This is totally unfinished, and will require more work to get it
* going. Hence it is totally untested.
*/
do {
struct adfs_discrecord *dr;
unsigned int nr_sects;
data = read_part_sector(state, start_blk * 2 + 6, &sect);
if (!data)
return -1;
if (slot == state->limit)
break;
dr = adfs_partition(state, name, data, first_sector, slot++);
if (!dr)
break;
name = NULL;
nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) *
(dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) *
dr->secspertrack;
if (!nr_sects)
break;
first = 0;
first_sector += nr_sects;
start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9);
nr_sects = 0; /* hmm - should be partition size */
switch (data[0x1fc] & 15) {
case 0: /* No partition / ADFS? */
break;
#ifdef CONFIG_ACORN_PARTITION_RISCIX
case PARTITION_RISCIX_SCSI:
/* RISCiX - we don't know how to find the next one. */
slot = riscix_partition(state, first_sector, slot,
nr_sects);
break;
#endif
case PARTITION_LINUX:
slot = linux_partition(state, first_sector, slot,
nr_sects);
break;
}
put_dev_sector(sect);
if (slot == -1)
return -1;
} while (1);
put_dev_sector(sect);
return first ? 0 : 1;
}
#endif
#ifdef CONFIG_ACORN_PARTITION_ADFS
/*
* Purpose: allocate ADFS partitions.
*
* Params : hd - pointer to gendisk structure to store partition info.
* dev - device number to access.
*
* Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok.
*
* Alloc : hda = whole drive
* hda1 = ADFS partition on first drive.
* hda2 = non-ADFS partition.
*/
int adfspart_check_ADFS(struct parsed_partitions *state)
{
unsigned long start_sect, nr_sects, sectscyl, heads;
Sector sect;
unsigned char *data;
struct adfs_discrecord *dr;
unsigned char id;
int slot = 1;
data = read_part_sector(state, 6, &sect);
if (!data)
return -1;
dr = adfs_partition(state, "ADFS", data, 0, slot++);
if (!dr) {
put_dev_sector(sect);
return 0;
}
heads = dr->heads + ((dr->lowsector >> 6) & 1);
sectscyl = dr->secspertrack * heads;
start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl;
id = data[0x1fc] & 15;
put_dev_sector(sect);
/*
* Work out start of non-adfs partition.
*/
nr_sects = (state->bdev->bd_inode->i_size >> 9) - start_sect;
if (start_sect) {
switch (id) {
#ifdef CONFIG_ACORN_PARTITION_RISCIX
case PARTITION_RISCIX_SCSI:
case PARTITION_RISCIX_MFM:
slot = riscix_partition(state, start_sect, slot,
nr_sects);
break;
#endif
case PARTITION_LINUX:
slot = linux_partition(state, start_sect, slot,
nr_sects);
break;
}
}
printk("\n");
return 1;
}
#endif
#ifdef CONFIG_ACORN_PARTITION_ICS
struct ics_part {
__le32 start;
__le32 size;
};
static int adfspart_check_ICSLinux(struct parsed_partitions *state,
unsigned long block)
{
Sector sect;
unsigned char *data = read_part_sector(state, block, &sect);
int result = 0;
if (data) {
if (memcmp(data, "LinuxPart", 9) == 0)
result = 1;
put_dev_sector(sect);
}
return result;
}
/*
* Check for a valid ICS partition using the checksum.
*/
static inline int valid_ics_sector(const unsigned char *data)
{
unsigned long sum;
int i;
for (i = 0, sum = 0x50617274; i < 508; i++)
sum += data[i];
sum -= le32_to_cpu(*(__le32 *)(&data[508]));
return sum == 0;
}
/*
* Purpose: allocate ICS partitions.
* Params : hd - pointer to gendisk structure to store partition info.
* dev - device number to access.
* Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
* Alloc : hda = whole drive
* hda1 = ADFS partition 0 on first drive.
* hda2 = ADFS partition 1 on first drive.
* ..etc..
*/
int adfspart_check_ICS(struct parsed_partitions *state)
{
const unsigned char *data;
const struct ics_part *p;
int slot;
Sector sect;
/*
* Try ICS style partitions - sector 0 contains partition info.
*/
data = read_part_sector(state, 0, &sect);
if (!data)
return -1;
if (!valid_ics_sector(data)) {
put_dev_sector(sect);
return 0;
}
printk(" [ICS]");
for (slot = 1, p = (const struct ics_part *)data; p->size; p++) {
u32 start = le32_to_cpu(p->start);
s32 size = le32_to_cpu(p->size); /* yes, it's signed. */
if (slot == state->limit)
break;
/*
* Negative sizes tell the RISC OS ICS driver to ignore
* this partition - in effect it says that this does not
* contain an ADFS filesystem.
*/
if (size < 0) {
size = -size;
/*
* Our own extension - We use the first sector
* of the partition to identify what type this
* partition is. We must not make this visible
* to the filesystem.
*/
if (size > 1 && adfspart_check_ICSLinux(state, start)) {
start += 1;
size -= 1;
}
}
if (size)
put_partition(state, slot++, start, size);
}
put_dev_sector(sect);
printk("\n");
return 1;
}
#endif
#ifdef CONFIG_ACORN_PARTITION_POWERTEC
struct ptec_part {
__le32 unused1;
__le32 unused2;
__le32 start;
__le32 size;
__le32 unused5;
char type[8];
};
static inline int valid_ptec_sector(const unsigned char *data)
{
unsigned char checksum = 0x2a;
int i;
/*
* If it looks like a PC/BIOS partition, then it
* probably isn't PowerTec.
*/
if (data[510] == 0x55 && data[511] == 0xaa)
return 0;
for (i = 0; i < 511; i++)
checksum += data[i];
return checksum == data[511];
}
/*
* Purpose: allocate ICS partitions.
* Params : hd - pointer to gendisk structure to store partition info.
* dev - device number to access.
* Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
* Alloc : hda = whole drive
* hda1 = ADFS partition 0 on first drive.
* hda2 = ADFS partition 1 on first drive.
* ..etc..
*/
int adfspart_check_POWERTEC(struct parsed_partitions *state)
{
Sector sect;
const unsigned char *data;
const struct ptec_part *p;
int slot = 1;
int i;
data = read_part_sector(state, 0, &sect);
if (!data)
return -1;
if (!valid_ptec_sector(data)) {
put_dev_sector(sect);
return 0;
}
printk(" [POWERTEC]");
for (i = 0, p = (const struct ptec_part *)data; i < 12; i++, p++) {
u32 start = le32_to_cpu(p->start);
u32 size = le32_to_cpu(p->size);
if (size)
put_partition(state, slot++, start, size);
}
put_dev_sector(sect);
printk("\n");
return 1;
}
#endif
#ifdef CONFIG_ACORN_PARTITION_EESOX
struct eesox_part {
char magic[6];
char name[10];
__le32 start;
__le32 unused6;
__le32 unused7;
__le32 unused8;
};
/*
* Guess who created this format?
*/
static const char eesox_name[] = {
'N', 'e', 'i', 'l', ' ',
'C', 'r', 'i', 't', 'c', 'h', 'e', 'l', 'l', ' ', ' '
};
/*
* EESOX SCSI partition format.
*
* This is a goddamned awful partition format. We don't seem to store
* the size of the partition in this table, only the start addresses.
*
* There are two possibilities where the size comes from:
* 1. The individual ADFS boot block entries that are placed on the disk.
* 2. The start address of the next entry.
*/
int adfspart_check_EESOX(struct parsed_partitions *state)
{
Sector sect;
const unsigned char *data;
unsigned char buffer[256];
struct eesox_part *p;
sector_t start = 0;
int i, slot = 1;
data = read_part_sector(state, 7, &sect);
if (!data)
return -1;
/*
* "Decrypt" the partition table. God knows why...
*/
for (i = 0; i < 256; i++)
buffer[i] = data[i] ^ eesox_name[i & 15];
put_dev_sector(sect);
for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) {
sector_t next;
if (memcmp(p->magic, "Eesox", 6))
break;
next = le32_to_cpu(p->start);
if (i)
put_partition(state, slot++, start, next - start);
start = next;
}
if (i != 0) {
sector_t size;
size = get_capacity(state->bdev->bd_disk);
put_partition(state, slot++, start, size - start);
printk("\n");
}
return i ? 1 : 0;
}
#endif
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