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/*
* mtdpart.c
*
* Copyright 2015 The Chromium OS Authors.
*
* 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.
*
* Overview:
* This utility adds or removes a partition from an MTD device.
*/
#define PROGRAM_NAME "mtdpart"
#include <fcntl.h>
#include <getopt.h>
#include <limits.h>
#include <linux/blkpg.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "common.h"
static void display_help(int status)
{
fprintf(status == EXIT_SUCCESS ? stdout : stderr,
"Usage: %1$s add [OPTION] <MTD_DEVICE> <PART_NAME> <START> <SIZE>\n"
" %1$s del [OPTION] <MTD_DEVICE> <PART_NUMBER>\n"
"Adds a partition to an MTD device, or remove an existing partition from it.\n"
"\n"
" -h, --help Display this help and exit\n"
" -V, --version Output version information and exit\n"
"\n"
"START location and SIZE of the partition are in bytes. They should align on\n"
"eraseblock size. If SIZE is 0 the partition will go to end of MTD device.\n",
PROGRAM_NAME
);
exit(status);
}
static void display_version(void)
{
common_print_version();
printf("%1$s comes with NO WARRANTY\n"
"to the extent permitted by law.\n"
"\n"
"You may redistribute copies of %1$s\n"
"under the terms of the GNU General Public Licence.\n"
"See the file `COPYING' for more information.\n",
PROGRAM_NAME);
exit(EXIT_SUCCESS);
}
/* Command arguments */
typedef enum {
COMMAND_ADD,
COMMAND_DEL
} command_type;
static command_type command; /* add or del */
static const char *mtddev; /* mtd device name */
static const char *part_name; /* partition name */
static int part_no; /* partition number */
static long long start_addr; /* start address */
static long long length; /* partition size */
static void process_options(int argc, char * const argv[])
{
int error = 0;
for (;;) {
int option_index = 0;
static const char short_options[] = "hV";
static const struct option long_options[] = {
{"version", no_argument, 0, 'V'},
{"help", no_argument, 0, 'h'},
{0, 0, 0, 0},
};
int c = getopt_long(argc, argv, short_options,
long_options, &option_index);
if (c == EOF) {
break;
}
switch (c) {
case 'V':
display_version();
break;
case 'h':
display_help(EXIT_SUCCESS);
break;
case '?':
error++;
break;
}
}
if ((argc - optind) < 3 || error)
display_help(EXIT_FAILURE);
const char *s_command = argv[optind++];
mtddev = argv[optind++];
if (strcmp(s_command, "del") == 0 && (argc - optind) == 1) {
const char *s_part_no = argv[optind++];
long tmp = simple_strtol(s_part_no, &error);
if (tmp < 0)
errmsg_die("Can't specify negative partition number: %ld",
tmp);
if (tmp > INT_MAX)
errmsg_die("Partition number exceeds INT_MAX: %ld",
tmp);
part_no = tmp;
command = COMMAND_DEL;
} else if (strcmp(s_command, "add") == 0 && (argc - optind) == 3) {
const char *s_start;
const char *s_length;
part_name = argv[optind++];
s_start = argv[optind++];
s_length = argv[optind++];
if (strlen(part_name) >= BLKPG_DEVNAMELTH)
errmsg_die("Partition name (%s) should be less than %d characters",
part_name, BLKPG_DEVNAMELTH);
start_addr = simple_strtoll(s_start, &error);
if (start_addr < 0)
errmsg_die("Can't specify negative start offset: %lld",
start_addr);
length = simple_strtoll(s_length, &error);
if (length < 0)
errmsg_die("Can't specify negative length: %lld",
length);
command = COMMAND_ADD;
} else
display_help(EXIT_FAILURE);
if (error)
display_help(EXIT_FAILURE);
}
int main(int argc, char * const argv[])
{
int fd;
struct blkpg_partition part;
struct blkpg_ioctl_arg arg;
process_options(argc, argv);
fd = open(mtddev, O_RDWR | O_CLOEXEC);
if (fd == -1)
sys_errmsg_die("Cannot open %s", mtddev);
memset(&part, 0, sizeof(part));
memset(&arg, 0, sizeof(arg));
arg.datalen = sizeof(part);
arg.data = ∂
switch (command) {
case COMMAND_ADD:
part.start = start_addr;
part.length = length;
strncpy(part.devname, part_name,
sizeof(part.devname) - 1);
part.devname[sizeof(part.devname) - 1] = '\0';
arg.op = BLKPG_ADD_PARTITION;
break;
case COMMAND_DEL:
part.pno = part_no;
arg.op = BLKPG_DEL_PARTITION;
break;
}
if (ioctl(fd, BLKPG, &arg))
sys_errmsg_die("Failed to issue BLKPG ioctl");
close(fd);
/* Exit happy */
return EXIT_SUCCESS;
}
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