barebox/commands/partition.c

/*
 * partition.c - parse a linux-like mtd partition definition and register
 *               the new partitions
 *
 * Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/**
 * @file
 * @brief partition handling and addpart and delpart command
 */

#ifdef CONFIG_ENABLE_PARTITION_NOISE
# define DEBUG
#endif

#include <common.h>
#include <command.h>
#include <driver.h>
#include <malloc.h>
#include <partition.h>
#include <errno.h>
#include <xfuncs.h>
#include <fs.h>
#include <linux/stat.h>
#include <libgen.h>

#define SIZE_REMAINING ((ulong)-1)

static int mtd_part_do_parse_one(char *devname, const char *partstr,
				 char **endp, unsigned long *offset,
				 off_t devsize, size_t *retsize)
{
	ulong size;
	char *end;
	char buf[PATH_MAX];
	unsigned long flags = 0;
	int ret;

	memset(buf, 0, PATH_MAX);

	if (*partstr == '-') {
		size = SIZE_REMAINING;
		end = (char *)partstr + 1;
	} else {
		size = strtoul_suffix(partstr, &end, 0);
	}

	if (*end == '@')
		*offset = strtoul_suffix(end+1, &end, 0);

	if (size == SIZE_REMAINING)
		size = devsize - *offset;

	partstr = end;

	if (*partstr == '(') {
		partstr++;
		end = strchr((char *) partstr, ')');
		if (!end) {
			printf("could not find matching ')'\n");
			return -EINVAL;
		}

		sprintf(buf, "%s.", devname);
		memcpy(buf + strlen(buf), partstr, end - partstr);

		end++;
	}

	if (size + *offset > devsize) {
		printf("%s: partition end is beyond device\n", buf);
		return -EINVAL;
	}

	partstr = end;

	if (*partstr == 'r' && *(partstr + 1) == 'o') {
		flags |= PARTITION_READONLY;
		end = (char *)(partstr + 2);
	}

	if (endp)
		*endp = end;

	*retsize = size;

	ret = devfs_add_partition(devname, *offset, size, flags, buf);
	if (ret)
		printf("cannot create %s: %s\n", buf, strerror(-ret));
	return ret;
}

static int do_addpart(struct command * cmdtp, int argc, char *argv[])
{
	char *devname;
	char *endp;
	unsigned long offset = 0;
	off_t devsize;
	struct stat s;

	if (argc != 3)
		return COMMAND_ERROR_USAGE;

	if (stat(argv[1], &s)) {
		perror("addpart");
		return 1;
	}
	devsize = s.st_size;

	devname = basename(argv[1]);

	endp = argv[2];

	while (1) {
		size_t size = 0;

		if (mtd_part_do_parse_one(devname, endp, &endp, &offset, devsize, &size))
			return 1;

		offset += size;

		if (!*endp)
			break;

		if (*endp != ',') {
			printf("parse error\n");
			return 1;
		}
		endp++;
	}

	return 0;
}

static const __maybe_unused char cmd_addpart_help[] =
"Usage: addpart <device> <partition description>\n"
"\n"
"addpart adds a partition description to a device. The partition description\n"
"has the form\n"
"size1[@offset1](name1)[ro],size2[@offset2](name2)[ro],...\n"
"<device> is the device name under. Size and offset can be given in decimal\n"
"or - if prefixed with 0x in hex. Both can have an optional suffix K,M,G.\n"
"The size of the last partition can be specified as '-' for the remaining\n"
"space of the device.\n"
"This format is the same as used in the Linux kernel for cmdline mtd partitions.\n"
"\n"
"Note: That this command has to be reworked and will probably change it's API.";

BAREBOX_CMD_START(addpart)
	.cmd = do_addpart,
	.usage = "adds a partition table to a device",
	BAREBOX_CMD_HELP(cmd_addpart_help)
BAREBOX_CMD_END

/** @page addpart_command addpart Add a partition to a device
 *
 * Usage is: addpart \<device> \<partition description>
 *
 * Adds a partition description to a device. The partition description has the
 * form
 *
 * size1[@offset1](name1)[ro],size2[@offset2](name2)[ro],...
 *
 * \<device> is the device name under. Size and offset can be given in decimal
 * or - if prefixed with 0x - in hex. Both can have an optional suffix K,M,G.
 * The size of the last partition can be specified as '-' for the remaining
 * space of the device.
 *
 * @note The format is the same as used in the Linux kernel for cmdline mtd
 * partitions.
 *
 * @note This command has to be reworked and will probably change it's API.
 */

static int do_delpart(struct command * cmdtp, int argc, char *argv[])
{
	int i, err;

	for (i = 1; i < argc; i++) {
		err = devfs_del_partition(basename(argv[i]));
		if (err) {
			printf("cannot delete %s: %s\n", argv[i], strerror(-err));
			break;
		}
	}

	return 1;
}

static const __maybe_unused char cmd_delpart_help[] =
"Usage: delpart FILE...\n"
"Delete partitions previously added to a device with addpart.\n";

BAREBOX_CMD_START(delpart)
	.cmd = do_delpart,
	.usage = "delete partition(s)",
	BAREBOX_CMD_HELP(cmd_delpart_help)
BAREBOX_CMD_END

/** @page delpart_command delpart Delete a partition
 *
 * Usage is: delpart \<partions>
 *
 * Delete a partition previously added to a device with addpart.
 */