commands/mount.c

   1 /*
   2  * mount.c - mount devices
   3  *
   4  * Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2
  11  * as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 /**
  24  * @file
  25  * @brief Filesystem mounting support
  26  */
  27
  28 #include <common.h>
  29 #include <command.h>
  30 #include <fs.h>
  31 #include <errno.h>
  32
  33 static int do_mount(struct command *cmdtp, int argc, char *argv[])
  34 {
  35         int ret = 0;
  36         struct mtab_entry *entry = NULL;
  37
  38         if (argc == 1) {
  39                 do {
  40                         entry = mtab_next_entry(entry);
  41                         if (entry) {
  42                                 printf("%s on %s type %s\n",
  43                                         entry->parent_device ? entry->parent_device->name : "none",
  44                                         entry->path,
  45                                         entry->dev->name);
  46                         }
  47                 } while (entry);
  48                 return 0;
  49         }
  50
  51         if (argc != 4)
  52                 return COMMAND_ERROR_USAGE;
  53
  54         if ((ret = mount(argv[1], argv[2], argv[3]))) {
  55                 perror("mount");
  56                 return 1;
  57         }
  58         return 0;
  59 }
  60
  61 static const __maybe_unused char cmd_mount_help[] =
  62 "Usage: mount:         list mounted filesystems\n"
  63 "or:    mount <device> <fstype> <mountpoint>\n"
  64 "\n"
  65 "Mount a filesystem of a given type to a mountpoint.\n"
  66 "<device> can be one of /dev/* or some arbitrary string if no\n"
  67 "device is needed for this driver (for example ramfs).\n"
  68 "<fstype> is the filesystem driver to use. Try the 'devinfo' command\n"
  69 "for a list of available drivers.\n"
  70 "<mountpoint> must be an empty directory descending directly from the\n"
  71 "root directory.\n";
  72
  73 BAREBOX_CMD_START(mount)
  74         .cmd            = do_mount,
  75         .usage          = "mount a filesystem to a device",
  76         BAREBOX_CMD_HELP(cmd_mount_help)
  77 BAREBOX_CMD_END
  78
  79 /** @page mount_command mount
  80  * Usage: mount [\<device> \<fstype> \<mountpoint>]
  81  *
  82  * Mounts a filesystem of a given \<fstype> on a \<device> to a \<mountpoint>.
  83  * \<device> can be one of /dev/ * or some arbitrary string if no
  84  * device is needed for this driver (for example ramfs).
  85  *
  86  * \<fstype> is the filesystem driver to use. Try the 'devinfo' command
  87  * for a list of available drivers.
  88  *
  89  * \<mountpoint> must be an empty directory descending directly from the
  90  * root directory.
  91  */
  92
  93 /** @page how_mount_works How mount works in barebox
  94  *
  95  * Mounting a filesystem ontop of a device is working like devices and drivers
  96  * are finding together.
  97  *
  98  * The mount command creates a new device with the filesystem name as the
  99  * driver for this "device". So the framework is able to merge both parts
 100  * together.
 101  *
 102  * By the way: With this feature its impossible to accidentely remove
 103  * partitions in use. A partition is internally also a device. If its mounted
 104  * it will be marked as busy, so an delpart command fails, until the filesystem
 105  * has been unmounted.
 106  */