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 #ifdef _WIN32
  20 #define _POSIX
  21 #define __USE_MINGW_ALARM
  22 #endif
  23
  24 #include "config.h"
  25 #include <fcntl.h>
  26 #include <setjmp.h>
  27 #include <signal.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #ifdef HAVE_ERRNO_H
  31 #include <errno.h>
  32 #endif
  33 #if HAVE_UNISTD_H
  34 #include <unistd.h>
  35 #endif
  36 #ifdef HAVE_LINUX_MAJOR_H
  37 #include <linux/major.h>
  38 #endif
  39 #include <sys/types.h>
  40 #ifdef HAVE_SYS_STAT_H
  41 #include <sys/stat.h>
  42 #endif
  43 #ifdef HAVE_UNISTD_H
  44 #include <unistd.h>
  45 #endif
  46 #include <time.h>
  47
  48 #include "et/com_err.h"
  49 #include "e2p/e2p.h"
  50 #include "ext2fs/ext2_fs.h"
  51 #include "ext2fs/ext2fs.h"
  52 #include "support/nls-enable.h"
  53 #include "support/devname.h"
  54 #include "blkid/blkid.h"
  55 #include "util.h"
  56
  57 char *journal_location_string = NULL;
  58
  59 #ifndef HAVE_STRCASECMP
  60 int strcasecmp (char *s1, char *s2)
  61 {
  62         while (*s1 && *s2) {
  63                 int ch1 = *s1++, ch2 = *s2++;
  64                 if (isupper (ch1))
  65                         ch1 = tolower (ch1);
  66                 if (isupper (ch2))
  67                         ch2 = tolower (ch2);
  68                 if (ch1 != ch2)
  69                         return ch1 - ch2;
  70         }
  71         return *s1 ? 1 : *s2 ? -1 : 0;
  72 }
  73 #endif
  74
  75 /*
  76  * Given argv[0], return the program name.
  77  */
  78 char *get_progname(char *argv_zero)
  79 {
  80         char    *cp;
  81
  82         cp = strrchr(argv_zero, '/');
  83         if (!cp )
  84                 return argv_zero;
  85         else
  86                 return cp+1;
  87 }
  88
  89 static jmp_buf alarm_env;
  90
  91 static void alarm_signal(int signal EXT2FS_ATTR((unused)))
  92 {
  93         longjmp(alarm_env, 1);
  94 }
  95
  96 void proceed_question(int delay)
  97 {
  98         char buf[256];
  99         const char *short_yes = _("yY");
 100         const char *english_yes = "yY";
 101
 102         fflush(stdout);
 103         fflush(stderr);
 104         if (delay > 0) {
 105                 if (setjmp(alarm_env)) {
 106                         signal(SIGALRM, SIG_IGN);
 107                         printf("%s", _("<proceeding>\n"));
 108                         return;
 109                 }
 110                 signal(SIGALRM, alarm_signal);
 111                 printf(_("Proceed anyway (or wait %d seconds to proceed) ? (y,N) "),
 112                        delay);
 113                 alarm(delay);
 114         } else
 115                 fputs(_("Proceed anyway? (y,N) "), stdout);
 116         buf[0] = 0;
 117         if (!fgets(buf, sizeof(buf), stdin) ||
 118             strchr(_("nN"), buf[0]) ||
 119             !(strchr(short_yes, buf[0]) ||
 120               strchr(english_yes, buf[0]))) {
 121                 putc('\n', stdout);
 122                 exit(1);
 123         }
 124         signal(SIGALRM, SIG_IGN);
 125 }
 126
 127 void check_mount(const char *device, int force, const char *type)
 128 {
 129         errcode_t       retval;
 130         int             mount_flags;
 131
 132         retval = ext2fs_check_if_mounted(device, &mount_flags);
 133         if (retval) {
 134                 com_err("ext2fs_check_if_mount", retval,
 135                         _("while determining whether %s is mounted."),
 136                         device);
 137                 return;
 138         }
 139         if (mount_flags & EXT2_MF_MOUNTED) {
 140                 fprintf(stderr, _("%s is mounted; "), device);
 141                 if (force >= 2) {
 142                         fputs(_("mke2fs forced anyway.  Hope /etc/mtab is "
 143                                 "incorrect.\n"), stderr);
 144                         return;
 145                 }
 146         abort_mke2fs:
 147                 fprintf(stderr, _("will not make a %s here!\n"), type);
 148                 exit(1);
 149         }
 150         if (mount_flags & EXT2_MF_BUSY) {
 151                 fprintf(stderr, _("%s is apparently in use by the system; "),
 152                         device);
 153                 if (force >= 2) {
 154                         fputs(_("mke2fs forced anyway.\n"), stderr);
 155                         return;
 156                 }
 157                 goto abort_mke2fs;
 158         }
 159 }
 160
 161 void parse_journal_opts(const char *opts)
 162 {
 163         char    *buf, *token, *next, *p, *arg;
 164         int     len;
 165         int     journal_usage = 0;
 166
 167         len = strlen(opts);
 168         buf = malloc(len+1);
 169         if (!buf) {
 170                 fputs(_("Couldn't allocate memory to parse journal "
 171                         "options!\n"), stderr);
 172                 exit(1);
 173         }
 174         strcpy(buf, opts);
 175         for (token = buf; token && *token; token = next) {
 176                 p = strchr(token, ',');
 177                 next = 0;
 178                 if (p) {
 179                         *p = 0;
 180                         next = p+1;
 181                 }
 182                 arg = strchr(token, '=');
 183                 if (arg) {
 184                         *arg = 0;
 185                         arg++;
 186                 }
 187 #if 0
 188                 printf("Journal option=%s, argument=%s\n", token,
 189                        arg ? arg : "NONE");
 190 #endif
 191                 if (strcmp(token, "device") == 0) {
 192                         journal_device = get_devname(NULL, arg, NULL);
 193                         if (!journal_device) {
 194                                 if (arg)
 195                                         fprintf(stderr, _("\nCould not find "
 196                                                 "journal device matching %s\n"),
 197                                                 arg);
 198                                 journal_usage++;
 199                                 continue;
 200                         }
 201                 } else if (strcmp(token, "size") == 0) {
 202                         if (!arg) {
 203                                 journal_usage++;
 204                                 continue;
 205                         }
 206                         journal_size = strtoul(arg, &p, 0);
 207                         if (*p)
 208                                 journal_usage++;
 209                 } else if (strcmp(token, "fast_commit_size") == 0) {
 210                         if (!arg) {
 211                                 journal_usage++;
 212                                 continue;
 213                         }
 214                         journal_fc_size = strtoul(arg, &p, 0);
 215                         if (*p)
 216                                 journal_usage++;
 217                 } else if (!strcmp(token, "location")) {
 218                         if (!arg) {
 219                                 journal_usage++;
 220                                 continue;
 221                         }
 222                         journal_location_string = strdup(arg);
 223                 } else if (strcmp(token, "v1_superblock") == 0) {
 224                         journal_flags |= EXT2_MKJOURNAL_V1_SUPER;
 225                         continue;
 226                 } else
 227                         journal_usage++;
 228         }
 229         if (journal_usage) {
 230                 fputs(_("\nBad journal options specified.\n\n"
 231                         "Journal options are separated by commas, "
 232                         "and may take an argument which\n"
 233                         "\tis set off by an equals ('=') sign.\n\n"
 234                         "Valid journal options are:\n"
 235                         "\tsize=<journal size in megabytes>\n"
 236                         "\tdevice=<journal device>\n"
 237                         "\tlocation=<journal location>\n\n"
 238                         "The journal size must be between "
 239                         "1024 and 10240000 filesystem blocks.\n\n"), stderr);
 240                 free(buf);
 241                 exit(1);
 242         }
 243         free(buf);
 244 }
 245
 246 static inline int jsize_to_blks(ext2_filsys fs, int size)
 247 {
 248         return (size * 1024) / (fs->blocksize / 1024);
 249 }
 250
 251 /* Fast commit size is in KBs */
 252 static inline int fcsize_to_blks(ext2_filsys fs, int size)
 253 {
 254         return (size * 1024) / (fs->blocksize);
 255 }
 256
 257 /*
 258  * Determine the number of journal blocks to use, either via
 259  * user-specified # of megabytes, or via some intelligently selected
 260  * defaults.
 261  *
 262  * Find a reasonable journal file size (in blocks) given the number of blocks in
 263  * the filesystem. For very small filesystems, it is not reasonable to have a
 264  * journal that fills more than half of the filesystem.
 265  */
 266 void figure_journal_size(struct ext2fs_journal_params *jparams,
 267                 int requested_j_size, int requested_fc_size, ext2_filsys fs)
 268 {
 269         int total_blocks, ret;
 270
 271         ret = ext2fs_get_journal_params(jparams, fs);
 272         if (ret) {
 273                 fputs(_("\nFilesystem too small for a journal\n"), stderr);
 274                 return;
 275         }
 276
 277         if (requested_j_size > 0 ||
 278                 (ext2fs_has_feature_fast_commit(fs->super) && requested_fc_size > 0)) {
 279                 if (requested_j_size > 0)
 280                         jparams->num_journal_blocks =
 281                                 jsize_to_blks(fs, requested_j_size);
 282                 if (ext2fs_has_feature_fast_commit(fs->super) &&
 283                         requested_fc_size > 0)
 284                         jparams->num_fc_blocks =
 285                                 fcsize_to_blks(fs, requested_fc_size);
 286                 else if (!ext2fs_has_feature_fast_commit(fs->super))
 287                         jparams->num_fc_blocks = 0;
 288                 total_blocks = jparams->num_journal_blocks + jparams->num_fc_blocks;
 289                 if (total_blocks < 1024 || total_blocks > 10240000) {
 290                         fprintf(stderr, _("\nThe total requested journal "
 291                                 "size is %d blocks; it must be\n"
 292                                 "between 1024 and 10240000 blocks.  "
 293                                 "Aborting.\n"),
 294                                 total_blocks);
 295                         exit(1);
 296                 }
 297                 if ((unsigned int) total_blocks > ext2fs_free_blocks_count(fs->super) / 2) {
 298                         fputs(_("\nTotal journal size too big for filesystem.\n"),
 299                               stderr);
 300                         exit(1);
 301                 }
 302         }
 303 }
 304
 305 void print_check_message(int mnt, unsigned int check)
 306 {
 307         if (mnt < 0)
 308                 mnt = 0;
 309         if (!mnt && !check)
 310                 return;
 311         printf(_("This filesystem will be automatically "
 312                  "checked every %d mounts or\n"
 313                  "%g days, whichever comes first.  "
 314                  "Use tune2fs -c or -i to override.\n"),
 315                mnt, ((double) check) / (3600 * 24));
 316 }
 317
 318 void dump_mmp_msg(struct mmp_struct *mmp, const char *msg)
 319 {
 320
 321         if (msg)
 322                 printf("MMP check failed: %s\n", msg);
 323         if (mmp) {
 324                 time_t t = mmp->mmp_time;
 325
 326                 printf("MMP error info: node: %.*s, device: %.*s, updated: %s",
 327                        EXT2_LEN_STR(mmp->mmp_nodename),
 328                        EXT2_LEN_STR(mmp->mmp_bdevname), ctime(&t));
 329         }
 330 }