/*
 * mount.c - mount devices
 *
 * 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 Filesystem mounting support
 */

#include <common.h>
#include <command.h>
#include <fs.h>
#include <errno.h>

static int do_mount(struct command *cmdtp, int argc, char *argv[])
{
	int ret = 0;
	struct mtab_entry *entry = NULL;

	if (argc == 1) {
		do {
			entry = mtab_next_entry(entry);
			if (entry) {
				printf("%s on %s type %s\n",
					entry->parent_device ? entry->parent_device->name : "none",
					entry->path,
					entry->dev->name);
			}
		} while (entry);
		return 0;
	}

	if (argc != 4)
		return COMMAND_ERROR_USAGE;

	if ((ret = mount(argv[1], argv[2], argv[3]))) {
		perror("mount");
		return 1;
	}
	return 0;
}

static const __maybe_unused char cmd_mount_help[] =
"Usage: mount:         list mounted filesystems\n"
"or:    mount <device> <fstype> <mountpoint>\n"
"\n"
"Mount a filesystem of a given type to a mountpoint.\n"
"<device> can be one of /dev/* or some arbitrary string if no\n"
"device is needed for this driver (for example ramfs).\n"
"<fstype> is the filesystem driver to use. Try the 'devinfo' command\n"
"for a list of available drivers.\n"
"<mountpoint> must be an empty directory descending directly from the\n"
"root directory.\n";

BAREBOX_CMD_START(mount)
	.cmd		= do_mount,
	.usage		= "mount a filesystem to a device",
	BAREBOX_CMD_HELP(cmd_mount_help)
BAREBOX_CMD_END

/** @page mount_command mount
 * Usage: mount [\<device> \<fstype> \<mountpoint>]
 *
 * Mounts a filesystem of a given \<fstype> on a \<device> to a \<mountpoint>.
 * \<device> can be one of /dev/ * or some arbitrary string if no
 * device is needed for this driver (for example ramfs).
 *
 * \<fstype> is the filesystem driver to use. Try the 'devinfo' command
 * for a list of available drivers.
 *
 * \<mountpoint> must be an empty directory descending directly from the
 * root directory.
 */

/** @page how_mount_works How mount works in barebox
 *
 * Mounting a filesystem ontop of a device is working like devices and drivers
 * are finding together.
 *
 * The mount command creates a new device with the filesystem name as the
 * driver for this "device". So the framework is able to merge both parts
 * together.
 *
 * By the way: With this feature its impossible to accidentely remove
 * partitions in use. A partition is internally also a device. If its mounted
 * it will be marked as busy, so an delpart command fails, until the filesystem
 * has been unmounted.
 */