misc/util.c

   1 /*
   2  * util.c --- helper functions used by tune2fs and mke2fs
   3  *
   4  * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the GNU Public
   8  * License.
   9  * %End-Header%
  10  */
  11
  12 #ifndef _LARGEFILE_SOURCE
  13 #define _LARGEFILE_SOURCE
  14 #endif
  15 #ifndef _LARGEFILE64_SOURCE
  16 #define _LARGEFILE64_SOURCE
  17 #endif
  18
  19 #include "config.h"
  20 #include <fcntl.h>
  21 #include <setjmp.h>
  22 #include <signal.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #ifdef HAVE_ERRNO_H
  26 #include <errno.h>
  27 #endif
  28 #if HAVE_UNISTD_H
  29 #include <unistd.h>
  30 #endif
  31 #ifdef HAVE_LINUX_MAJOR_H
  32 #include <linux/major.h>
  33 #endif
  34 #include <sys/types.h>
  35 #ifdef HAVE_SYS_STAT_H
  36 #include <sys/stat.h>
  37 #endif
  38 #ifdef HAVE_UNISTD_H
  39 #include <unistd.h>
  40 #endif
  41 #include <time.h>
  42
  43 #include "et/com_err.h"
  44 #include "e2p/e2p.h"
  45 #include "ext2fs/ext2_fs.h"
  46 #include "ext2fs/ext2fs.h"
  47 #include "support/nls-enable.h"
  48 #include "support/devname.h"
  49 #include "blkid/blkid.h"
  50 #include "util.h"
  51
  52 char *journal_location_string = NULL;
  53
  54 #ifndef HAVE_STRCASECMP
  55 int strcasecmp (char *s1, char *s2)
  56 {
  57         while (*s1 && *s2) {
  58                 int ch1 = *s1++, ch2 = *s2++;
  59                 if (isupper (ch1))
  60                         ch1 = tolower (ch1);
  61                 if (isupper (ch2))
  62                         ch2 = tolower (ch2);
  63                 if (ch1 != ch2)
  64                         return ch1 - ch2;
  65         }
  66         return *s1 ? 1 : *s2 ? -1 : 0;
  67 }
  68 #endif
  69
  70 /*
  71  * Given argv[0], return the program name.
  72  */
  73 char *get_progname(char *argv_zero)
  74 {
  75         char    *cp;
  76
  77         cp = strrchr(argv_zero, '/');
  78         if (!cp )
  79                 return argv_zero;
  80         else
  81                 return cp+1;
  82 }
  83
  84 static jmp_buf alarm_env;
  85
  86 static void alarm_signal(int signal EXT2FS_ATTR((unused)))
  87 {
  88         longjmp(alarm_env, 1);
  89 }
  90
  91 void proceed_question(int delay)
  92 {
  93         char buf[256];
  94         const char *short_yes = _("yY");
  95         const char *english_yes = "yY";
  96
  97         fflush(stdout);
  98         fflush(stderr);
  99         if (delay > 0) {
 100                 if (setjmp(alarm_env)) {
 101                         signal(SIGALRM, SIG_IGN);
 102                         printf("%s", _("<proceeding>\n"));
 103                         return;
 104                 }
 105                 signal(SIGALRM, alarm_signal);
 106                 printf(_("Proceed anyway (or wait %d seconds to proceed) ? (y,N) "),
 107                        delay);
 108                 alarm(delay);
 109         } else
 110                 fputs(_("Proceed anyway? (y,N) "), stdout);
 111         buf[0] = 0;
 112         if (!fgets(buf, sizeof(buf), stdin) ||
 113             strchr(_("nN"), buf[0]) ||
 114             !(strchr(short_yes, buf[0]) ||
 115               strchr(english_yes, buf[0]))) {
 116                 putc('\n', stdout);
 117                 exit(1);
 118         }
 119         signal(SIGALRM, SIG_IGN);
 120 }
 121
 122 void check_mount(const char *device, int force, const char *type)
 123 {
 124         errcode_t       retval;
 125         int             mount_flags;
 126
 127         retval = ext2fs_check_if_mounted(device, &mount_flags);
 128         if (retval) {
 129                 com_err("ext2fs_check_if_mount", retval,
 130                         _("while determining whether %s is mounted."),
 131                         device);
 132                 return;
 133         }
 134         if (mount_flags & EXT2_MF_MOUNTED) {
 135                 fprintf(stderr, _("%s is mounted; "), device);
 136                 if (force >= 2) {
 137                         fputs(_("mke2fs forced anyway.  Hope /etc/mtab is "
 138                                 "incorrect.\n"), stderr);
 139                         return;
 140                 }
 141         abort_mke2fs:
 142                 fprintf(stderr, _("will not make a %s here!\n"), type);
 143                 exit(1);
 144         }
 145         if (mount_flags & EXT2_MF_BUSY) {
 146                 fprintf(stderr, _("%s is apparently in use by the system; "),
 147                         device);
 148                 if (force >= 2) {
 149                         fputs(_("mke2fs forced anyway.\n"), stderr);
 150                         return;
 151                 }
 152                 goto abort_mke2fs;
 153         }
 154 }
 155
 156 void parse_journal_opts(const char *opts)
 157 {
 158         char    *buf, *token, *next, *p, *arg;
 159         int     len;
 160         int     journal_usage = 0;
 161
 162         len = strlen(opts);
 163         buf = malloc(len+1);
 164         if (!buf) {
 165                 fputs(_("Couldn't allocate memory to parse journal "
 166                         "options!\n"), stderr);
 167                 exit(1);
 168         }
 169         strcpy(buf, opts);
 170         for (token = buf; token && *token; token = next) {
 171                 p = strchr(token, ',');
 172                 next = 0;
 173                 if (p) {
 174                         *p = 0;
 175                         next = p+1;
 176                 }
 177                 arg = strchr(token, '=');
 178                 if (arg) {
 179                         *arg = 0;
 180                         arg++;
 181                 }
 182 #if 0
 183                 printf("Journal option=%s, argument=%s\n", token,
 184                        arg ? arg : "NONE");
 185 #endif
 186                 if (strcmp(token, "device") == 0) {
 187                         journal_device = get_devname(NULL, arg, NULL);
 188                         if (!journal_device) {
 189                                 if (arg)
 190                                         fprintf(stderr, _("\nCould not find "
 191                                                 "journal device matching %s\n"),
 192                                                 arg);
 193                                 journal_usage++;
 194                                 continue;
 195                         }
 196                 } else if (strcmp(token, "size") == 0) {
 197                         if (!arg) {
 198                                 journal_usage++;
 199                                 continue;
 200                         }
 201                         journal_size = strtoul(arg, &p, 0);
 202                         if (*p)
 203                                 journal_usage++;
 204                 } else if (strcmp(token, "fast_commit_size") == 0) {
 205                         if (!arg) {
 206                                 journal_usage++;
 207                                 continue;
 208                         }
 209                         journal_fc_size = strtoul(arg, &p, 0);
 210                         if (*p)
 211                                 journal_usage++;
 212                 } else if (!strcmp(token, "location")) {
 213                         if (!arg) {
 214                                 journal_usage++;
 215                                 continue;
 216                         }
 217                         journal_location_string = strdup(arg);
 218                 } else if (strcmp(token, "v1_superblock") == 0) {
 219                         journal_flags |= EXT2_MKJOURNAL_V1_SUPER;
 220                         continue;
 221                 } else
 222                         journal_usage++;
 223         }
 224         if (journal_usage) {
 225                 fputs(_("\nBad journal options specified.\n\n"
 226                         "Journal options are separated by commas, "
 227                         "and may take an argument which\n"
 228                         "\tis set off by an equals ('=') sign.\n\n"
 229                         "Valid journal options are:\n"
 230                         "\tsize=<journal size in megabytes>\n"
 231                         "\tdevice=<journal device>\n"
 232                         "\tlocation=<journal location>\n\n"
 233                         "The journal size must be between "
 234                         "1024 and 10240000 filesystem blocks.\n\n"), stderr);
 235                 free(buf);
 236                 exit(1);
 237         }
 238         free(buf);
 239 }
 240
 241 static inline int jsize_to_blks(ext2_filsys fs, int size)
 242 {
 243         return (size * 1024) / (fs->blocksize / 1024);
 244 }
 245
 246 /* Fast commit size is in KBs */
 247 static inline int fcsize_to_blks(ext2_filsys fs, int size)
 248 {
 249         return (size * 1024) / (fs->blocksize);
 250 }
 251
 252 /*
 253  * Determine the number of journal blocks to use, either via
 254  * user-specified # of megabytes, or via some intelligently selected
 255  * defaults.
 256  *
 257  * Find a reasonable journal file size (in blocks) given the number of blocks in
 258  * the filesystem. For very small filesystems, it is not reasonable to have a
 259  * journal that fills more than half of the filesystem.
 260  */
 261 void figure_journal_size(struct ext2fs_journal_params *jparams,
 262                 int requested_j_size, int requested_fc_size, ext2_filsys fs)
 263 {
 264         int total_blocks, ret;
 265
 266         ret = ext2fs_get_journal_params(jparams, fs);
 267         if (ret) {
 268                 fputs(_("\nFilesystem too small for a journal\n"), stderr);
 269                 return;
 270         }
 271
 272         if (requested_j_size > 0 ||
 273                 (ext2fs_has_feature_fast_commit(fs->super) && requested_fc_size > 0)) {
 274                 if (requested_j_size > 0)
 275                         jparams->num_journal_blocks =
 276                                 jsize_to_blks(fs, requested_j_size);
 277                 if (ext2fs_has_feature_fast_commit(fs->super) &&
 278                         requested_fc_size > 0)
 279                         jparams->num_fc_blocks =
 280                                 fcsize_to_blks(fs, requested_fc_size);
 281                 else if (!ext2fs_has_feature_fast_commit(fs->super))
 282                         jparams->num_fc_blocks = 0;
 283                 total_blocks = jparams->num_journal_blocks + jparams->num_fc_blocks;
 284                 if (total_blocks < 1024 || total_blocks > 10240000) {
 285                         fprintf(stderr, _("\nThe total requested journal "
 286                                 "size is %d blocks; it must be\n"
 287                                 "between 1024 and 10240000 blocks.  "
 288                                 "Aborting.\n"),
 289                                 total_blocks);
 290                         exit(1);
 291                 }
 292                 if ((unsigned int) total_blocks > ext2fs_free_blocks_count(fs->super) / 2) {
 293                         fputs(_("\nTotal journal size too big for filesystem.\n"),
 294                               stderr);
 295                         exit(1);
 296                 }
 297         }
 298 }
 299
 300 void print_check_message(int mnt, unsigned int check)
 301 {
 302         if (mnt < 0)
 303                 mnt = 0;
 304         if (!mnt && !check)
 305                 return;
 306         printf(_("This filesystem will be automatically "
 307                  "checked every %d mounts or\n"
 308                  "%g days, whichever comes first.  "
 309                  "Use tune2fs -c or -i to override.\n"),
 310                mnt, ((double) check) / (3600 * 24));
 311 }
 312
 313 void dump_mmp_msg(struct mmp_struct *mmp, const char *msg)
 314 {
 315
 316         if (msg)
 317                 printf("MMP check failed: %s\n", msg);
 318         if (mmp) {
 319                 time_t t = mmp->mmp_time;
 320
 321                 printf("MMP error info: node: %.*s, device: %.*s, updated: %s",
 322                        EXT2_LEN_STR(mmp->mmp_nodename),
 323                        EXT2_LEN_STR(mmp->mmp_bdevname), ctime(&t));
 324         }
 325 }