release/src/router/busybox/e2fsprogs/util.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * util.c --- helper functions used by tune2fs and mke2fs
   4  *
   5  * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
   6  *
   7  * Licensed under GPLv2, see file LICENSE in this source tree.
   8  */
   9
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <errno.h>
  13 #include <linux/major.h>
  14 #include <sys/stat.h>
  15
  16 #include "e2fsbb.h"
  17 #include "e2p/e2p.h"
  18 #include "ext2fs/ext2_fs.h"
  19 #include "ext2fs/ext2fs.h"
  20 #include "volume_id.h"
  21 #include "util.h"
  22
  23 void proceed_question(void)
  24 {
  25         fputs("Proceed anyway? (y,n) ", stdout);
  26         if (bb_ask_confirmation() == 0)
  27                 exit(1);
  28 }
  29
  30 void check_plausibility(const char *device, int force)
  31 {
  32         int val;
  33         struct stat s;
  34         val = stat(device, &s);
  35         if (force)
  36                 return;
  37         if (val == -1)
  38                 bb_perror_msg_and_die("can't stat '%s'", device);
  39         if (!S_ISBLK(s.st_mode)) {
  40                 printf("%s is not a block special device.\n", device);
  41                 proceed_question();
  42                 return;
  43         }
  44
  45 #ifdef HAVE_LINUX_MAJOR_H
  46 #ifndef MAJOR
  47 #define MAJOR(dev)      ((dev)>>8)
  48 #define MINOR(dev)      ((dev) & 0xff)
  49 #endif
  50 #ifndef SCSI_BLK_MAJOR
  51 #ifdef SCSI_DISK0_MAJOR
  52 #ifdef SCSI_DISK8_MAJOR
  53 #define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
  54   ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR) || \
  55   ((M) >= SCSI_DISK8_MAJOR && (M) <= SCSI_DISK15_MAJOR))
  56 #else
  57 #define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
  58   ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR))
  59 #endif /* defined(SCSI_DISK8_MAJOR) */
  60 #define SCSI_BLK_MAJOR(M) (SCSI_DISK_MAJOR((M)) || (M) == SCSI_CDROM_MAJOR)
  61 #else
  62 #define SCSI_BLK_MAJOR(M)  ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
  63 #endif /* defined(SCSI_DISK0_MAJOR) */
  64 #endif /* defined(SCSI_BLK_MAJOR) */
  65         if (((MAJOR(s.st_rdev) == HD_MAJOR &&
  66               MINOR(s.st_rdev)%64 == 0) ||
  67              (SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
  68               MINOR(s.st_rdev)%16 == 0))) {
  69                 printf("%s is entire device, not just one partition!\n", device);
  70                 proceed_question();
  71         }
  72 #endif
  73 }
  74
  75 void check_mount(const char *device, int force, const char *type UNUSED_PARAM)
  76 {
  77         errcode_t retval;
  78         int mount_flags;
  79
  80         retval = ext2fs_check_if_mounted(device, &mount_flags);
  81         if (retval) {
  82                 bb_error_msg("can't determine if %s is mounted", device);
  83                 return;
  84         }
  85         if (mount_flags & EXT2_MF_MOUNTED) {
  86                 bb_error_msg("%s is mounted !", device);
  87 force_check:
  88                 if (force)
  89                         bb_error_msg("badblocks forced anyways");
  90                 else
  91                         bb_error_msg_and_die("it's not safe to run badblocks!");
  92         }
  93
  94         if (mount_flags & EXT2_MF_BUSY) {
  95                 bb_error_msg("%s is apparently in use by the system", device);
  96                 goto force_check;
  97         }
  98 }
  99
 100 void parse_journal_opts(char **journal_device, int *journal_flags,
 101                         int *journal_size, const char *opts)
 102 {
 103         char *buf, *token, *next, *p, *arg;
 104         int journal_usage = 0;
 105         buf = xstrdup(opts);
 106         for (token = buf; token && *token; token = next) {
 107                 p = strchr(token, ',');
 108                 next = 0;
 109                 if (p) {
 110                         *p = 0;
 111                         next = p+1;
 112                 }
 113                 arg = strchr(token, '=');
 114                 if (arg) {
 115                         *arg = 0;
 116                         arg++;
 117                 }
 118                 if (strcmp(token, "device") == 0) {
 119                         *journal_device = arg;
 120                         if (resolve_mount_spec(journal_device) < 0 ||
 121                             !(*journal_device)) {
 122                                 journal_usage++;
 123                                 continue;
 124                         }
 125                 } else if (strcmp(token, "size") == 0) {
 126                         if (!arg) {
 127                                 journal_usage++;
 128                                 continue;
 129                         }
 130                         (*journal_size) = strtoul(arg, &p, 0);
 131                         if (*p)
 132                                 journal_usage++;
 133                 } else if (strcmp(token, "v1_superblock") == 0) {
 134                         (*journal_flags) |= EXT2_MKJOURNAL_V1_SUPER;
 135                         continue;
 136                 } else
 137                         journal_usage++;
 138         }
 139         if (journal_usage)
 140                 bb_error_msg_and_die(
 141                         "\nBad journal options specified.\n\n"
 142                         "Journal options are separated by commas, "
 143                         "and may take an argument which\n"
 144                         "\tis set off by an equals ('=') sign.\n\n"
 145                         "Valid journal options are:\n"
 146                         "\tsize=<journal size in megabytes>\n"
 147                         "\tdevice=<journal device>\n\n"
 148                         "The journal size must be between "
 149                         "1024 and 102400 filesystem blocks.\n\n");
 150 }
 151
 152 /*
 153  * Determine the number of journal blocks to use, either via
 154  * user-specified # of megabytes, or via some intelligently selected
 155  * defaults.
 156  *
 157  * Find a reasonable journal file size (in blocks) given the number of blocks
 158  * in the filesystem.  For very small filesystems, it is not reasonable to
 159  * have a journal that fills more than half of the filesystem.
 160  */
 161 int figure_journal_size(int size, ext2_filsys fs)
 162 {
 163         blk_t j_blocks;
 164
 165         if (fs->super->s_blocks_count < 2048) {
 166                 bb_error_msg("Filesystem too small for a journal");
 167                 return 0;
 168         }
 169
 170         if (size >= 0) {
 171                 j_blocks = size * 1024 / (fs->blocksize / 1024);
 172                 if (j_blocks < 1024 || j_blocks > 102400)
 173                         bb_error_msg_and_die("\nThe requested journal "
 174                                 "size is %d blocks;\n it must be "
 175                                 "between 1024 and 102400 blocks; Aborting",
 176                                 j_blocks);
 177                 if (j_blocks > fs->super->s_free_blocks_count)
 178                         bb_error_msg_and_die("Journal size too big for filesystem");
 179                 return j_blocks;
 180         }
 181
 182         if (fs->super->s_blocks_count < 32768)
 183                 j_blocks = 1024;
 184         else if (fs->super->s_blocks_count < 256*1024)
 185                 j_blocks = 4096;
 186         else if (fs->super->s_blocks_count < 512*1024)
 187                 j_blocks = 8192;
 188         else if (fs->super->s_blocks_count < 1024*1024)
 189                 j_blocks = 16384;
 190         else
 191                 j_blocks = 32768;
 192
 193         return j_blocks;
 194 }
 195
 196 void print_check_message(ext2_filsys fs)
 197 {
 198         printf("This filesystem will be automatically "
 199                  "checked every %d mounts or\n"
 200                  "%g days, whichever comes first.  "
 201                  "Use tune2fs -c or -i to override.\n",
 202                fs->super->s_max_mnt_count,
 203                (double)fs->super->s_checkinterval / (3600 * 24));
 204 }
 205
 206 void make_journal_device(char *journal_device, ext2_filsys fs, int quiet, int force)
 207 {
 208         errcode_t       retval;
 209         ext2_filsys     jfs;
 210         io_manager      io_ptr;
 211
 212         check_plausibility(journal_device, force);
 213         check_mount(journal_device, force, "journal");
 214         io_ptr = unix_io_manager;
 215         retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
 216                                         EXT2_FLAG_JOURNAL_DEV_OK, 0,
 217                                         fs->blocksize, io_ptr, &jfs);
 218         if (retval)
 219                 bb_error_msg_and_die("can't journal device %s", journal_device);
 220         if (!quiet)
 221                 printf("Adding journal to device %s: ", journal_device);
 222         fflush(stdout);
 223         retval = ext2fs_add_journal_device(fs, jfs);
 224         if (retval)
 225                 bb_error_msg_and_die("\nFailed to add journal to device %s", journal_device);
 226         if (!quiet)
 227                 puts("done");
 228         ext2fs_close(jfs);
 229 }
 230
 231 void make_journal_blocks(ext2_filsys fs, int journal_size, int journal_flags, int quiet)
 232 {
 233         unsigned long journal_blocks;
 234         errcode_t       retval;
 235
 236         journal_blocks = figure_journal_size(journal_size, fs);
 237         if (!journal_blocks) {
 238                 fs->super->s_feature_compat &=
 239                         ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 240                 return;
 241         }
 242         if (!quiet)
 243                 printf("Creating journal (%ld blocks): ", journal_blocks);
 244         fflush(stdout);
 245         retval = ext2fs_add_journal_inode(fs, journal_blocks,
 246                                                   journal_flags);
 247         if (retval)
 248                 bb_error_msg_and_die("can't create journal");
 249         if (!quiet)
 250                 puts("done");
 251 }
 252
 253 char *e2fs_set_sbin_path(void)
 254 {
 255         char *oldpath = getenv("PATH");
 256         /* Update our PATH to include /sbin  */
 257 #define PATH_SET "/sbin"
 258         if (oldpath)
 259                 oldpath = xasprintf("%s:%s", PATH_SET, oldpath);
 260          else
 261                 oldpath = (char *)PATH_SET;
 262         putenv(oldpath);
 263         return oldpath;
 264 }