198 строки
4.2 KiB
C
198 строки
4.2 KiB
C
/*
|
|
* fs/partitions/check.c
|
|
*
|
|
* Code extracted from drivers/block/genhd.c
|
|
* Copyright (C) 1991-1998 Linus Torvalds
|
|
* Re-organised Feb 1998 Russell King
|
|
*
|
|
* We now have independent partition support from the
|
|
* block drivers, which allows all the partition code to
|
|
* be grouped in one location, and it to be mostly self
|
|
* contained.
|
|
*
|
|
* Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/genhd.h>
|
|
|
|
#include "check.h"
|
|
|
|
#include "acorn.h"
|
|
#include "amiga.h"
|
|
#include "atari.h"
|
|
#include "ldm.h"
|
|
#include "mac.h"
|
|
#include "msdos.h"
|
|
#include "osf.h"
|
|
#include "sgi.h"
|
|
#include "sun.h"
|
|
#include "ibm.h"
|
|
#include "ultrix.h"
|
|
#include "efi.h"
|
|
#include "karma.h"
|
|
#include "sysv68.h"
|
|
#include "cmdline.h"
|
|
|
|
int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
|
|
|
|
static int (*check_part[])(struct parsed_partitions *) = {
|
|
/*
|
|
* Probe partition formats with tables at disk address 0
|
|
* that also have an ADFS boot block at 0xdc0.
|
|
*/
|
|
#ifdef CONFIG_ACORN_PARTITION_ICS
|
|
adfspart_check_ICS,
|
|
#endif
|
|
#ifdef CONFIG_ACORN_PARTITION_POWERTEC
|
|
adfspart_check_POWERTEC,
|
|
#endif
|
|
#ifdef CONFIG_ACORN_PARTITION_EESOX
|
|
adfspart_check_EESOX,
|
|
#endif
|
|
|
|
/*
|
|
* Now move on to formats that only have partition info at
|
|
* disk address 0xdc0. Since these may also have stale
|
|
* PC/BIOS partition tables, they need to come before
|
|
* the msdos entry.
|
|
*/
|
|
#ifdef CONFIG_ACORN_PARTITION_CUMANA
|
|
adfspart_check_CUMANA,
|
|
#endif
|
|
#ifdef CONFIG_ACORN_PARTITION_ADFS
|
|
adfspart_check_ADFS,
|
|
#endif
|
|
|
|
#ifdef CONFIG_CMDLINE_PARTITION
|
|
cmdline_partition,
|
|
#endif
|
|
#ifdef CONFIG_EFI_PARTITION
|
|
efi_partition, /* this must come before msdos */
|
|
#endif
|
|
#ifdef CONFIG_SGI_PARTITION
|
|
sgi_partition,
|
|
#endif
|
|
#ifdef CONFIG_LDM_PARTITION
|
|
ldm_partition, /* this must come before msdos */
|
|
#endif
|
|
#ifdef CONFIG_MSDOS_PARTITION
|
|
msdos_partition,
|
|
#endif
|
|
#ifdef CONFIG_OSF_PARTITION
|
|
osf_partition,
|
|
#endif
|
|
#ifdef CONFIG_SUN_PARTITION
|
|
sun_partition,
|
|
#endif
|
|
#ifdef CONFIG_AMIGA_PARTITION
|
|
amiga_partition,
|
|
#endif
|
|
#ifdef CONFIG_ATARI_PARTITION
|
|
atari_partition,
|
|
#endif
|
|
#ifdef CONFIG_MAC_PARTITION
|
|
mac_partition,
|
|
#endif
|
|
#ifdef CONFIG_ULTRIX_PARTITION
|
|
ultrix_partition,
|
|
#endif
|
|
#ifdef CONFIG_IBM_PARTITION
|
|
ibm_partition,
|
|
#endif
|
|
#ifdef CONFIG_KARMA_PARTITION
|
|
karma_partition,
|
|
#endif
|
|
#ifdef CONFIG_SYSV68_PARTITION
|
|
sysv68_partition,
|
|
#endif
|
|
NULL
|
|
};
|
|
|
|
static struct parsed_partitions *allocate_partitions(struct gendisk *hd)
|
|
{
|
|
struct parsed_partitions *state;
|
|
int nr;
|
|
|
|
state = kzalloc(sizeof(*state), GFP_KERNEL);
|
|
if (!state)
|
|
return NULL;
|
|
|
|
nr = disk_max_parts(hd);
|
|
state->parts = vzalloc(nr * sizeof(state->parts[0]));
|
|
if (!state->parts) {
|
|
kfree(state);
|
|
return NULL;
|
|
}
|
|
|
|
state->limit = nr;
|
|
|
|
return state;
|
|
}
|
|
|
|
void free_partitions(struct parsed_partitions *state)
|
|
{
|
|
vfree(state->parts);
|
|
kfree(state);
|
|
}
|
|
|
|
struct parsed_partitions *
|
|
check_partition(struct gendisk *hd, struct block_device *bdev)
|
|
{
|
|
struct parsed_partitions *state;
|
|
int i, res, err;
|
|
|
|
state = allocate_partitions(hd);
|
|
if (!state)
|
|
return NULL;
|
|
state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
|
|
if (!state->pp_buf) {
|
|
free_partitions(state);
|
|
return NULL;
|
|
}
|
|
state->pp_buf[0] = '\0';
|
|
|
|
state->bdev = bdev;
|
|
disk_name(hd, 0, state->name);
|
|
snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
|
|
if (isdigit(state->name[strlen(state->name)-1]))
|
|
sprintf(state->name, "p");
|
|
|
|
i = res = err = 0;
|
|
while (!res && check_part[i]) {
|
|
memset(state->parts, 0, state->limit * sizeof(state->parts[0]));
|
|
res = check_part[i++](state);
|
|
if (res < 0) {
|
|
/* We have hit an I/O error which we don't report now.
|
|
* But record it, and let the others do their job.
|
|
*/
|
|
err = res;
|
|
res = 0;
|
|
}
|
|
|
|
}
|
|
if (res > 0) {
|
|
printk(KERN_INFO "%s", state->pp_buf);
|
|
|
|
free_page((unsigned long)state->pp_buf);
|
|
return state;
|
|
}
|
|
if (state->access_beyond_eod)
|
|
err = -ENOSPC;
|
|
if (err)
|
|
/* The partition is unrecognized. So report I/O errors if there were any */
|
|
res = err;
|
|
if (res) {
|
|
if (warn_no_part)
|
|
strlcat(state->pp_buf,
|
|
" unable to read partition table\n", PAGE_SIZE);
|
|
printk(KERN_INFO "%s", state->pp_buf);
|
|
}
|
|
|
|
free_page((unsigned long)state->pp_buf);
|
|
free_partitions(state);
|
|
return ERR_PTR(res);
|
|
}
|