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