commands/partition.c

   1 /*
   2  * partition.c - parse a linux-like mtd partition definition and register
   3  *               the new partitions
   4  *
   5  * Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2
  12  * as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 /**
  25  * @file
  26  * @brief partition handling and addpart and delpart command
  27  */
  28
  29 #ifdef CONFIG_ENABLE_PARTITION_NOISE
  30 # define DEBUG
  31 #endif
  32
  33 #include <common.h>
  34 #include <command.h>
  35 #include <driver.h>
  36 #include <malloc.h>
  37 #include <partition.h>
  38 #include <errno.h>
  39 #include <xfuncs.h>
  40 #include <fs.h>
  41 #include <linux/stat.h>
  42 #include <libgen.h>
  43
  44 #define SIZE_REMAINING ((ulong)-1)
  45
  46 static int mtd_part_do_parse_one(char *devname, const char *partstr,
  47                                  char **endp, unsigned long *offset,
  48                                  off_t devsize, size_t *retsize)
  49 {
  50         ulong size;
  51         char *end;
  52         char buf[PATH_MAX];
  53         unsigned long flags = 0;
  54         int ret;
  55
  56         memset(buf, 0, PATH_MAX);
  57
  58         if (*partstr == '-') {
  59                 size = SIZE_REMAINING;
  60                 end = (char *)partstr + 1;
  61         } else {
  62                 size = strtoul_suffix(partstr, &end, 0);
  63         }
  64
  65         if (*end == '@')
  66                 *offset = strtoul_suffix(end+1, &end, 0);
  67
  68         if (size == SIZE_REMAINING)
  69                 size = devsize - *offset;
  70
  71         partstr = end;
  72
  73         if (*partstr == '(') {
  74                 partstr++;
  75                 end = strchr((char *) partstr, ')');
  76                 if (!end) {
  77                         printf("could not find matching ')'\n");
  78                         return -EINVAL;
  79                 }
  80
  81                 sprintf(buf, "%s.", devname);
  82                 memcpy(buf + strlen(buf), partstr, end - partstr);
  83
  84                 end++;
  85         }
  86
  87         if (size + *offset > devsize) {
  88                 printf("%s: partition end is beyond device\n", buf);
  89                 return -EINVAL;
  90         }
  91
  92         partstr = end;
  93
  94         if (*partstr == 'r' && *(partstr + 1) == 'o') {
  95                 flags |= PARTITION_READONLY;
  96                 end = (char *)(partstr + 2);
  97         }
  98
  99         if (endp)
 100                 *endp = end;
 101
 102         *retsize = size;
 103
 104         ret = devfs_add_partition(devname, *offset, size, flags, buf);
 105         if (ret)
 106                 printf("cannot create %s: %s\n", buf, strerror(-ret));
 107         return ret;
 108 }
 109
 110 static int do_addpart(struct command * cmdtp, int argc, char *argv[])
 111 {
 112         char *devname;
 113         char *endp;
 114         unsigned long offset = 0;
 115         off_t devsize;
 116         struct stat s;
 117
 118         if (argc != 3)
 119                 return COMMAND_ERROR_USAGE;
 120
 121         if (stat(argv[1], &s)) {
 122                 perror("addpart");
 123                 return 1;
 124         }
 125         devsize = s.st_size;
 126
 127         devname = basename(argv[1]);
 128
 129         endp = argv[2];
 130
 131         while (1) {
 132                 size_t size = 0;
 133
 134                 if (mtd_part_do_parse_one(devname, endp, &endp, &offset, devsize, &size))
 135                         return 1;
 136
 137                 offset += size;
 138
 139                 if (!*endp)
 140                         break;
 141
 142                 if (*endp != ',') {
 143                         printf("parse error\n");
 144                         return 1;
 145                 }
 146                 endp++;
 147         }
 148
 149         return 0;
 150 }
 151
 152 static const __maybe_unused char cmd_addpart_help[] =
 153 "Usage: addpart <device> <partition description>\n"
 154 "\n"
 155 "addpart adds a partition description to a device. The partition description\n"
 156 "has the form\n"
 157 "size1[@offset1](name1)[ro],size2[@offset2](name2)[ro],...\n"
 158 "<device> is the device name under. Size and offset can be given in decimal\n"
 159 "or - if prefixed with 0x in hex. Both can have an optional suffix K,M,G.\n"
 160 "The size of the last partition can be specified as '-' for the remaining\n"
 161 "space of the device.\n"
 162 "This format is the same as used in the Linux kernel for cmdline mtd partitions.\n"
 163 "\n"
 164 "Note: That this command has to be reworked and will probably change it's API.";
 165
 166 BAREBOX_CMD_START(addpart)
 167         .cmd = do_addpart,
 168         .usage = "adds a partition table to a device",
 169         BAREBOX_CMD_HELP(cmd_addpart_help)
 170 BAREBOX_CMD_END
 171
 172 /** @page addpart_command addpart Add a partition to a device
 173  *
 174  * Usage is: addpart \<device> \<partition description>
 175  *
 176  * Adds a partition description to a device. The partition description has the
 177  * form
 178  *
 179  * size1[@offset1](name1)[ro],size2[@offset2](name2)[ro],...
 180  *
 181  * \<device> is the device name under. Size and offset can be given in decimal
 182  * or - if prefixed with 0x - in hex. Both can have an optional suffix K,M,G.
 183  * The size of the last partition can be specified as '-' for the remaining
 184  * space of the device.
 185  *
 186  * @note The format is the same as used in the Linux kernel for cmdline mtd
 187  * partitions.
 188  *
 189  * @note This command has to be reworked and will probably change it's API.
 190  */
 191
 192 static int do_delpart(struct command * cmdtp, int argc, char *argv[])
 193 {
 194         int i, err;
 195
 196         for (i = 1; i < argc; i++) {
 197                 err = devfs_del_partition(basename(argv[i]));
 198                 if (err) {
 199                         printf("cannot delete %s: %s\n", argv[i], strerror(-err));
 200                         break;
 201                 }
 202         }
 203
 204         return 1;
 205 }
 206
 207 static const __maybe_unused char cmd_delpart_help[] =
 208 "Usage: delpart FILE...\n"
 209 "Delete partitions previously added to a device with addpart.\n";
 210
 211 BAREBOX_CMD_START(delpart)
 212         .cmd = do_delpart,
 213         .usage = "delete partition(s)",
 214         BAREBOX_CMD_HELP(cmd_delpart_help)
 215 BAREBOX_CMD_END
 216
 217 /** @page delpart_command delpart Delete a partition
 218  *
 219  * Usage is: delpart \<partions>
 220  *
 221  * Delete a partition previously added to a device with addpart.
 222  */