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 "ext2fs/ext2fsP.h"
  48 #include "support/nls-enable.h"
  49 #include "support/devname.h"
  50 #include "blkid/blkid.h"
  51 #include "util.h"
  52
  53 char *journal_location_string = NULL;
  54
  55 #ifndef HAVE_STRCASECMP
  56 int strcasecmp (char *s1, char *s2)
  57 {
  58         while (*s1 && *s2) {
  59                 int ch1 = *s1++, ch2 = *s2++;
  60                 if (isupper (ch1))
  61                         ch1 = tolower (ch1);
  62                 if (isupper (ch2))
  63                         ch2 = tolower (ch2);
  64                 if (ch1 != ch2)
  65                         return ch1 - ch2;
  66         }
  67         return *s1 ? 1 : *s2 ? -1 : 0;
  68 }
  69 #endif
  70
  71 /*
  72  * Given argv[0], return the program name.
  73  */
  74 char *get_progname(char *argv_zero)
  75 {
  76         char    *cp;
  77
  78         cp = strrchr(argv_zero, '/');
  79         if (!cp )
  80                 return argv_zero;
  81         else
  82                 return cp+1;
  83 }
  84
  85 static jmp_buf alarm_env;
  86
  87 static void alarm_signal(int signal EXT2FS_ATTR((unused)))
  88 {
  89         longjmp(alarm_env, 1);
  90 }
  91
  92 void proceed_question(int delay)
  93 {
  94         char buf[256];
  95         const char *short_yes = _("yY");
  96         const char *english_yes = "yY";
  97
  98         fflush(stdout);
  99         fflush(stderr);
 100         if (delay > 0) {
 101                 if (setjmp(alarm_env)) {
 102                         signal(SIGALRM, SIG_IGN);
 103                         printf("%s", _("<proceeding>\n"));
 104                         return;
 105                 }
 106                 signal(SIGALRM, alarm_signal);
 107                 printf(_("Proceed anyway (or wait %d seconds to proceed) ? (y,N) "),
 108                        delay);
 109                 alarm(delay);
 110         } else
 111                 fputs(_("Proceed anyway? (y,N) "), stdout);
 112         buf[0] = 0;
 113         if (!fgets(buf, sizeof(buf), stdin) ||
 114             strchr(_("nN"), buf[0]) ||
 115             !(strchr(short_yes, buf[0]) ||
 116               strchr(english_yes, buf[0]))) {
 117                 putc('\n', stdout);
 118                 exit(1);
 119         }
 120         signal(SIGALRM, SIG_IGN);
 121 }
 122
 123 void check_mount(const char *device, int force, const char *type)
 124 {
 125         errcode_t       retval;
 126         int             mount_flags;
 127
 128         retval = ext2fs_check_if_mounted(device, &mount_flags);
 129         if (retval) {
 130                 com_err("ext2fs_check_if_mount", retval,
 131                         _("while determining whether %s is mounted."),
 132                         device);
 133                 return;
 134         }
 135         if (mount_flags & EXT2_MF_MOUNTED) {
 136                 fprintf(stderr, _("%s is mounted; "), device);
 137                 if (force >= 2) {
 138                         fputs(_("mke2fs forced anyway.  Hope /etc/mtab is "
 139                                 "incorrect.\n"), stderr);
 140                         return;
 141                 }
 142         abort_mke2fs:
 143                 fprintf(stderr, _("will not make a %s here!\n"), type);
 144                 exit(1);
 145         }
 146         if (mount_flags & EXT2_MF_BUSY) {
 147                 fprintf(stderr, _("%s is apparently in use by the system; "),
 148                         device);
 149                 if (force >= 2) {
 150                         fputs(_("mke2fs forced anyway.\n"), stderr);
 151                         return;
 152                 }
 153                 goto abort_mke2fs;
 154         }
 155 }
 156
 157 void parse_journal_opts(const char *opts)
 158 {
 159         char    *buf, *token, *next, *p, *arg;
 160         int     len;
 161         int     journal_usage = 0;
 162
 163         len = strlen(opts);
 164         buf = malloc(len+1);
 165         if (!buf) {
 166                 fputs(_("Couldn't allocate memory to parse journal "
 167                         "options!\n"), stderr);
 168                 exit(1);
 169         }
 170         strcpy(buf, opts);
 171         for (token = buf; token && *token; token = next) {
 172                 p = strchr(token, ',');
 173                 next = 0;
 174                 if (p) {
 175                         *p = 0;
 176                         next = p+1;
 177                 }
 178                 arg = strchr(token, '=');
 179                 if (arg) {
 180                         *arg = 0;
 181                         arg++;
 182                 }
 183 #if 0
 184                 printf("Journal option=%s, argument=%s\n", token,
 185                        arg ? arg : "NONE");
 186 #endif
 187                 if (strcmp(token, "device") == 0) {
 188                         journal_device = get_devname(NULL, arg, NULL);
 189                         if (!journal_device) {
 190                                 if (arg)
 191                                         fprintf(stderr, _("\nCould not find "
 192                                                 "journal device matching %s\n"),
 193                                                 arg);
 194                                 journal_usage++;
 195                                 continue;
 196                         }
 197                 } else if (strcmp(token, "size") == 0) {
 198                         if (!arg) {
 199                                 journal_usage++;
 200                                 continue;
 201                         }
 202                         journal_size = strtoul(arg, &p, 0);
 203                         if (*p)
 204                                 journal_usage++;
 205                 } else if (strcmp(token, "fast_commit_size") == 0) {
 206                         if (!arg) {
 207                                 journal_usage++;
 208                                 continue;
 209                         }
 210                         journal_fc_size = strtoul(arg, &p, 0);
 211                         if (*p)
 212                                 journal_usage++;
 213                 } else if (!strcmp(token, "location")) {
 214                         if (!arg) {
 215                                 journal_usage++;
 216                                 continue;
 217                         }
 218                         journal_location_string = strdup(arg);
 219                 } else if (strcmp(token, "v1_superblock") == 0) {
 220                         journal_flags |= EXT2_MKJOURNAL_V1_SUPER;
 221                         continue;
 222                 } else
 223                         journal_usage++;
 224         }
 225         if (journal_usage) {
 226                 fputs(_("\nBad journal options specified.\n\n"
 227                         "Journal options are separated by commas, "
 228                         "and may take an argument which\n"
 229                         "\tis set off by an equals ('=') sign.\n\n"
 230                         "Valid journal options are:\n"
 231                         "\tsize=<journal size in megabytes>\n"
 232                         "\tdevice=<journal device>\n"
 233                         "\tlocation=<journal location>\n\n"
 234                         "The journal size must be between "
 235                         "1024 and 10240000 filesystem blocks.\n\n"), stderr);
 236                 free(buf);
 237                 exit(1);
 238         }
 239         free(buf);
 240 }
 241
 242 static inline int jsize_to_blks(ext2_filsys fs, int size)
 243 {
 244         return (size * 1024) / (fs->blocksize / 1024);
 245 }
 246
 247 /* Fast commit size is in KBs */
 248 static inline int fcsize_to_blks(ext2_filsys fs, int size)
 249 {
 250         return (size * 1024) / (fs->blocksize);
 251 }
 252
 253 /*
 254  * Determine the number of journal blocks to use, either via
 255  * user-specified # of megabytes, or via some intelligently selected
 256  * defaults.
 257  *
 258  * Find a reasonable journal file size (in blocks) given the number of blocks in
 259  * the filesystem. For very small filesystems, it is not reasonable to have a
 260  * journal that fills more than half of the filesystem.
 261  */
 262 void figure_journal_size(struct ext2fs_journal_params *jparams,
 263                 int requested_j_size, int requested_fc_size, ext2_filsys fs)
 264 {
 265         int total_blocks, ret;
 266
 267         ret = ext2fs_get_journal_params(jparams, fs);
 268         if (ret) {
 269                 fputs(_("\nFilesystem too small for a journal\n"), stderr);
 270                 return;
 271         }
 272
 273         if (requested_j_size > 0 ||
 274                 (ext2fs_has_feature_fast_commit(fs->super) && requested_fc_size > 0)) {
 275                 int min_size;
 276
 277                 if (ext2fs_is_before_linux_ver(3, 10, 0) ||
 278                     ext2fs_blocks_count(fs->super) <= 8192)
 279                         min_size = 1024;
 280                 else
 281                         min_size = 2048;
 282
 283                 if (requested_j_size > 0)
 284                         jparams->num_journal_blocks =
 285                                 jsize_to_blks(fs, requested_j_size);
 286                 if (ext2fs_has_feature_fast_commit(fs->super) &&
 287                         requested_fc_size > 0)
 288                         jparams->num_fc_blocks =
 289                                 fcsize_to_blks(fs, requested_fc_size);
 290                 else if (!ext2fs_has_feature_fast_commit(fs->super))
 291                         jparams->num_fc_blocks = 0;
 292                 total_blocks = jparams->num_journal_blocks + jparams->num_fc_blocks;
 293                 if (total_blocks < min_size || total_blocks > 10240000) {
 294                         fprintf(stderr, _("\nThe total requested journal "
 295                                 "size is %d blocks; it must be\n"
 296                                 "between %d and 10240000 blocks.  "
 297                                 "Aborting.\n"),
 298                                 total_blocks, min_size);
 299                         exit(1);
 300                 }
 301                 if ((unsigned int) total_blocks > ext2fs_free_blocks_count(fs->super) / 2) {
 302                         fputs(_("\nTotal journal size too big for filesystem.\n"),
 303                               stderr);
 304                         exit(1);
 305                 }
 306         }
 307 }
 308
 309 void print_check_message(int mnt, unsigned int check)
 310 {
 311         if (mnt < 0)
 312                 mnt = 0;
 313         if (!mnt && !check)
 314                 return;
 315         printf(_("This filesystem will be automatically "
 316                  "checked every %d mounts or\n"
 317                  "%g days, whichever comes first.  "
 318                  "Use tune2fs -c or -i to override.\n"),
 319                mnt, ((double) check) / (3600 * 24));
 320 }
 321
 322 void dump_mmp_msg(struct mmp_struct *mmp, const char *msg)
 323 {
 324
 325         if (msg)
 326                 printf("MMP check failed: %s\n", msg);
 327         if (mmp) {
 328                 time_t t = mmp->mmp_time;
 329
 330                 printf("MMP error info: node: %.*s, device: %.*s, updated: %s",
 331                        EXT2_LEN_STR(mmp->mmp_nodename),
 332                        EXT2_LEN_STR(mmp->mmp_bdevname), ctime(&t));
 333         }
 334 }