misc/tune2fs.c

   1 /*
   2  * tune2fs.c            - Change the file system parameters on
   3  *                        an unmounted second extended file system
   4  *
   5  * Copyright (C) 1992, 1993, 1994  Remy Card <card@masi.ibp.fr>
   6  *                                 Laboratoire MASI, Institut Blaise Pascal
   7  *                                 Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  * This file can be redistributed under the terms of the GNU General
  10  * Public License
  11  */
  12
  13 /*
  14  * History:
  15  * 93/06/01     - Creation
  16  * 93/10/31     - Added the -c option to change the maximal mount counts
  17  * 93/12/14     - Added -l flag to list contents of superblock
  18  *                M.J.E. Mol (marcel@duteca.et.tudelft.nl)
  19  *                F.W. ten Wolde (franky@duteca.et.tudelft.nl)
  20  * 93/12/29     - Added the -e option to change errors behavior
  21  * 94/02/27     - Ported to use the ext2fs library
  22  * 94/03/06     - Added the checks interval from Uwe Ohse (uwe@tirka.gun.de)
  23  */
  24
  25 #include <fcntl.h>
  26 #include <grp.h>
  27 #include <getopt.h>
  28 #include <pwd.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <time.h>
  33 #include <unistd.h>
  34 #include <sys/types.h>
  35
  36 #include <linux/ext2_fs.h>
  37
  38 #include "ext2fs/ext2fs.h"
  39 #include "et/com_err.h"
  40 #include "e2p/e2p.h"
  41
  42 #include "../version.h"
  43
  44 const char * program_name = "tune2fs";
  45 char * device_name = NULL;
  46 int c_flag = 0;
  47 int e_flag = 0;
  48 int g_flag = 0;
  49 int i_flag = 0;
  50 int l_flag = 0;
  51 int m_flag = 0;
  52 int r_flag = 0;
  53 int u_flag = 0;
  54 int max_mount_count;
  55 unsigned long interval;
  56 unsigned long reserved_ratio = 0;
  57 unsigned long reserved_blocks = 0;
  58 unsigned short errors;
  59 unsigned long resgid = 0;
  60 unsigned long resuid = 0;
  61
  62 static volatile void usage (void)
  63 {
  64         fprintf (stderr, "Usage: %s [-c max-mounts-count] [-e errors-behavior] "
  65                  "[-g group]\n"
  66                  "\t[-i interval[d|m|w]] [-l] [-m reserved-blocks-percent]\n"
  67                  "\t[-r reserved-blocks-count] [-u user] device\n", program_name);
  68         exit (1);
  69 }
  70
  71 void main (int argc, char ** argv)
  72 {
  73         char c;
  74         char * tmp;
  75         errcode_t retval;
  76         ext2_filsys fs;
  77         struct group * gr;
  78         struct passwd * pw;
  79
  80         fprintf (stderr, "tune2fs %s, %s for EXT2 FS %s, %s\n",
  81                  E2FSPROGS_VERSION, E2FSPROGS_DATE,
  82                  EXT2FS_VERSION, EXT2FS_DATE);
  83         if (argc && *argv)
  84                 program_name = *argv;
  85         initialize_ext2_error_table();
  86         while ((c = getopt (argc, argv, "c:e:g:i:lm:r:u:")) != EOF)
  87                 switch (c)
  88                 {
  89                         case 'c':
  90                                 max_mount_count = strtoul (optarg, &tmp, 0);
  91                                 if (*tmp || max_mount_count > 16000)
  92                                 {
  93                                         com_err (program_name, 0,
  94                                                  "bad mounts count - %s",
  95                                                  optarg);
  96                                         usage ();
  97                                 }
  98                                 c_flag = 1;
  99                                 break;
 100                         case 'e':
 101                                 if (strcmp (optarg, "continue") == 0)
 102                                         errors = EXT2_ERRORS_CONTINUE;
 103                                 else if (strcmp (optarg, "remount-ro") == 0)
 104                                         errors = EXT2_ERRORS_RO;
 105                                 else if (strcmp (optarg, "panic") == 0)
 106                                         errors = EXT2_ERRORS_PANIC;
 107                                 else
 108                                 {
 109                                         com_err (program_name, 0,
 110                                                  "bad error behavior - %s",
 111                                                  optarg);
 112                                         usage ();
 113                                 }
 114                                 e_flag = 1;
 115                                 break;
 116                         case 'g':
 117                                 resgid = strtoul (optarg, &tmp, 0);
 118                                 if (*tmp)
 119                                 {
 120                                         gr = getgrnam (optarg);
 121                                         if (gr == NULL)
 122                                                 tmp = optarg;
 123                                         else
 124                                                 resgid = gr->gr_gid;
 125                                 }
 126                                 if (*tmp)
 127                                 {
 128                                         com_err (program_name, 0,
 129                                                  "bad gid/group name - %s",
 130                                                  optarg);
 131                                         usage ();
 132                                 }
 133                                 g_flag = 1;
 134                                 break;
 135                         case 'i':
 136                                 interval = strtoul (optarg, &tmp, 0);
 137                                 switch (*tmp)
 138                                 {
 139                                         case '\0':
 140                                         case 'd':
 141                                         case 'D': /* days */
 142                                                 interval *= 86400;
 143                                                 if (*tmp != '\0')
 144                                                         tmp++;
 145                                                 break;
 146                                         case 'm':
 147                                         case 'M': /* months! */
 148                                                 interval *= 86400 * 30;
 149                                                 tmp++;
 150                                                 break;
 151                                         case 'w':
 152                                         case 'W': /* weeks */
 153                                                 interval *= 86400 * 7;
 154                                                 tmp++;
 155                                                 break;
 156                                 }
 157                                 if (*tmp || interval > (365 * 86400))
 158                                 {
 159                                         com_err (program_name, 0,
 160                                                  "bad interval - %s", optarg);
 161                                         usage ();
 162                                 }
 163                                 i_flag = 1;
 164                                 break;
 165                         case 'l':
 166                                 l_flag = 1;
 167                                 break;
 168                         case 'm':
 169                                 reserved_ratio = strtoul (optarg, &tmp, 0);
 170                                 if (*tmp || reserved_ratio > 50)
 171                                 {
 172                                         com_err (program_name, 0,
 173                                                  "bad reserved block ratio - %s",
 174                                                  optarg);
 175                                         usage ();
 176                                 }
 177                                 m_flag = 1;
 178                                 break;
 179                         case 'r':
 180                                 reserved_blocks = strtoul (optarg, &tmp, 0);
 181                                 if (*tmp)
 182                                 {
 183                                         com_err (program_name, 0,
 184                                                  "bad reserved blocks count - %s",
 185                                                  optarg);
 186                                         usage ();
 187                                 }
 188                                 r_flag = 1;
 189                                 break;
 190                         case 'u':
 191                                 resuid = strtoul (optarg, &tmp, 0);
 192                                 if (*tmp)
 193                                 {
 194                                         pw = getpwnam (optarg);
 195                                         if (pw == NULL)
 196                                                 tmp = optarg;
 197                                         else
 198                                                 resuid = pw->pw_uid;
 199                                 }
 200                                 if (*tmp)
 201                                 {
 202                                         com_err (program_name, 0,
 203                                                  "bad uid/user name - %s",
 204                                                  optarg);
 205                                         usage ();
 206                                 }
 207                                 u_flag = 1;
 208                                 break;
 209                         default:
 210                                 usage ();
 211                 }
 212         if (optind < argc - 1 || optind == argc)
 213                 usage ();
 214         if (!c_flag && !e_flag && !g_flag && !i_flag && !l_flag && !m_flag
 215             && !r_flag && !u_flag)
 216                 usage ();
 217         device_name = argv[optind];
 218         retval = ext2fs_open (device_name,
 219                               (c_flag || e_flag || g_flag || i_flag || m_flag
 220                                || r_flag || u_flag) ? EXT2_FLAG_RW : 0,
 221                               0, 0, unix_io_manager, &fs);
 222         if (retval)
 223         {
 224                 com_err (program_name, retval, "while trying to open %s",
 225                          device_name);
 226                 printf("Couldn't find valid filesystem superblock.\n");
 227                 exit(1);
 228         }
 229
 230         if (c_flag)
 231         {
 232                 fs->super->s_max_mnt_count = max_mount_count;
 233                 ext2fs_mark_super_dirty(fs);
 234                 printf ("Setting maximal mount count to %d\n", max_mount_count);
 235         }
 236         if (e_flag)
 237         {
 238                 fs->super->s_errors = errors;
 239                 ext2fs_mark_super_dirty(fs);
 240                 printf ("Setting error behavior to %d\n", errors);
 241         }
 242         if (g_flag)
 243 #ifdef  EXT2_DEF_RESGID
 244         {
 245                 fs->super->s_def_resgid = resgid;
 246                 ext2fs_mark_super_dirty(fs);
 247                 printf ("Setting reserved blocks gid to %lu\n", resgid);
 248         }
 249 #else
 250                 com_err (program_name, 0,
 251                          "The -g option is not supported by this version -- "
 252                          "Recompile with a newer kernel");
 253 #endif
 254         if (i_flag)
 255         {
 256                 fs->super->s_checkinterval = interval;
 257                 ext2fs_mark_super_dirty(fs);
 258                 printf ("Setting interval between check %lu seconds\n", interval);
 259         }
 260         if (m_flag)
 261         {
 262                 fs->super->s_r_blocks_count = (fs->super->s_blocks_count / 100)
 263                         * reserved_ratio;
 264                 ext2fs_mark_super_dirty(fs);
 265                 printf ("Setting reserved blocks percentage to %lu (%lu blocks)\n",
 266                         reserved_ratio, fs->super->s_r_blocks_count);
 267         }
 268         if (r_flag)
 269         {
 270                 if (reserved_blocks >= fs->super->s_blocks_count)
 271                 {
 272                         com_err (program_name, 0,
 273                                  "reserved blocks count is too big (%ul)",
 274                                  reserved_blocks);
 275                         exit (1);
 276                 }
 277                 fs->super->s_r_blocks_count = reserved_blocks;
 278                 ext2fs_mark_super_dirty(fs);
 279                 printf ("Setting reserved blocks count to %lu\n",
 280                         reserved_blocks);
 281         }
 282         if (u_flag)
 283 #ifdef  EXT2_DEF_RESUID
 284         {
 285                 fs->super->s_def_resuid = resuid;
 286                 ext2fs_mark_super_dirty(fs);
 287                 printf ("Setting reserved blocks uid to %lu\n", resuid);
 288         }
 289 #else
 290                 com_err (program_name, 0,
 291                          "The -u option is not supported by this version -- "
 292                          "Recompile with a newer kernel");
 293 #endif
 294         if (l_flag)
 295                 list_super (fs->super);
 296         ext2fs_close (fs);
 297         exit (0);
 298 }