199 lines
4.2 KiB
C
199 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* fs/partitions/check.c
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*
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* Code extracted from drivers/block/genhd.c
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* Copyright (C) 1991-1998 Linus Torvalds
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* Re-organised Feb 1998 Russell King
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*
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* We now have independent partition support from the
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* block drivers, which allows all the partition code to
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* be grouped in one location, and it to be mostly self
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* contained.
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*
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* Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
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*/
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/ctype.h>
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#include <linux/genhd.h>
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#include "check.h"
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#include "acorn.h"
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#include "amiga.h"
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#include "atari.h"
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#include "ldm.h"
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#include "mac.h"
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#include "msdos.h"
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#include "osf.h"
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#include "sgi.h"
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#include "sun.h"
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#include "ibm.h"
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#include "ultrix.h"
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#include "efi.h"
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#include "karma.h"
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#include "sysv68.h"
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#include "cmdline.h"
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int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
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static int (*check_part[])(struct parsed_partitions *) = {
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/*
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* Probe partition formats with tables at disk address 0
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* that also have an ADFS boot block at 0xdc0.
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*/
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#ifdef CONFIG_ACORN_PARTITION_ICS
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adfspart_check_ICS,
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#endif
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#ifdef CONFIG_ACORN_PARTITION_POWERTEC
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adfspart_check_POWERTEC,
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#endif
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#ifdef CONFIG_ACORN_PARTITION_EESOX
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adfspart_check_EESOX,
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#endif
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/*
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* Now move on to formats that only have partition info at
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* disk address 0xdc0. Since these may also have stale
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* PC/BIOS partition tables, they need to come before
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* the msdos entry.
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*/
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#ifdef CONFIG_ACORN_PARTITION_CUMANA
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adfspart_check_CUMANA,
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#endif
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#ifdef CONFIG_ACORN_PARTITION_ADFS
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adfspart_check_ADFS,
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#endif
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#ifdef CONFIG_CMDLINE_PARTITION
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cmdline_partition,
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#endif
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#ifdef CONFIG_EFI_PARTITION
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efi_partition, /* this must come before msdos */
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#endif
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#ifdef CONFIG_SGI_PARTITION
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sgi_partition,
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#endif
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#ifdef CONFIG_LDM_PARTITION
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ldm_partition, /* this must come before msdos */
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#endif
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#ifdef CONFIG_MSDOS_PARTITION
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msdos_partition,
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#endif
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#ifdef CONFIG_OSF_PARTITION
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osf_partition,
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#endif
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#ifdef CONFIG_SUN_PARTITION
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sun_partition,
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#endif
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#ifdef CONFIG_AMIGA_PARTITION
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amiga_partition,
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#endif
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#ifdef CONFIG_ATARI_PARTITION
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atari_partition,
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#endif
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#ifdef CONFIG_MAC_PARTITION
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mac_partition,
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#endif
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#ifdef CONFIG_ULTRIX_PARTITION
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ultrix_partition,
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#endif
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#ifdef CONFIG_IBM_PARTITION
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ibm_partition,
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#endif
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#ifdef CONFIG_KARMA_PARTITION
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karma_partition,
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#endif
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#ifdef CONFIG_SYSV68_PARTITION
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sysv68_partition,
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#endif
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NULL
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};
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static struct parsed_partitions *allocate_partitions(struct gendisk *hd)
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{
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struct parsed_partitions *state;
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int nr;
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state = kzalloc(sizeof(*state), GFP_KERNEL);
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if (!state)
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return NULL;
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nr = disk_max_parts(hd);
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state->parts = vzalloc(array_size(nr, sizeof(state->parts[0])));
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if (!state->parts) {
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kfree(state);
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return NULL;
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}
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state->limit = nr;
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return state;
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}
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void free_partitions(struct parsed_partitions *state)
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{
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vfree(state->parts);
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kfree(state);
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}
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struct parsed_partitions *
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check_partition(struct gendisk *hd, struct block_device *bdev)
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{
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struct parsed_partitions *state;
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int i, res, err;
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state = allocate_partitions(hd);
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if (!state)
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return NULL;
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state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
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if (!state->pp_buf) {
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free_partitions(state);
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return NULL;
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}
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state->pp_buf[0] = '\0';
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state->bdev = bdev;
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disk_name(hd, 0, state->name);
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snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
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if (isdigit(state->name[strlen(state->name)-1]))
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sprintf(state->name, "p");
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i = res = err = 0;
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while (!res && check_part[i]) {
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memset(state->parts, 0, state->limit * sizeof(state->parts[0]));
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res = check_part[i++](state);
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if (res < 0) {
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/* We have hit an I/O error which we don't report now.
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* But record it, and let the others do their job.
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*/
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err = res;
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res = 0;
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}
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}
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if (res > 0) {
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printk(KERN_INFO "%s", state->pp_buf);
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free_page((unsigned long)state->pp_buf);
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return state;
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}
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if (state->access_beyond_eod)
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err = -ENOSPC;
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if (err)
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/* The partition is unrecognized. So report I/O errors if there were any */
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res = err;
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if (res) {
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if (warn_no_part)
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strlcat(state->pp_buf,
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" unable to read partition table\n", PAGE_SIZE);
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printk(KERN_INFO "%s", state->pp_buf);
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}
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free_page((unsigned long)state->pp_buf);
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free_partitions(state);
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return ERR_PTR(res);
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}
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