1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * mkjournal.c --- make a journal for a filesystem
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4 | *
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5 | * Copyright (C) 2000 Theodore Ts'o.
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6 | *
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7 | * %Begin-Header%
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8 | * This file may be redistributed under the terms of the GNU Public
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9 | * License.
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10 | * %End-Header%
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11 | */
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12 |
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13 | #include <stdio.h>
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14 | #include <string.h>
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15 | #if HAVE_UNISTD_H
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16 | #include <unistd.h>
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17 | #endif
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18 | #if HAVE_ERRNO_H
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19 | #include <errno.h>
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20 | #endif
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21 | #include <fcntl.h>
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22 | #include <time.h>
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23 | #if HAVE_SYS_STAT_H
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24 | #include <sys/stat.h>
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25 | #endif
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26 | #if HAVE_SYS_TYPES_H
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27 | #include <sys/types.h>
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28 | #endif
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29 | #if HAVE_SYS_IOCTL_H
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30 | #include <sys/ioctl.h>
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31 | #endif
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32 | #if HAVE_NETINET_IN_H
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33 | #include <netinet/in.h>
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34 | #endif
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35 |
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36 | #include "ext2_fs.h"
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37 | #include "../e2p/e2p.h"
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38 | #include "../e2fsck.h"
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39 | #include "ext2fs.h"
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40 | #include "kernel-jbd.h"
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41 |
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42 | /*
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43 | * This function automatically sets up the journal superblock and
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44 | * returns it as an allocated block.
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45 | */
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46 | errcode_t ext2fs_create_journal_superblock(ext2_filsys fs,
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47 | __u32 size, int flags,
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48 | char **ret_jsb)
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49 | {
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50 | errcode_t retval;
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51 | journal_superblock_t *jsb;
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52 |
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53 | if (size < 1024)
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54 | return EXT2_ET_JOURNAL_TOO_SMALL;
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55 |
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56 | if ((retval = ext2fs_get_mem(fs->blocksize, &jsb)))
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57 | return retval;
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58 |
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59 | memset (jsb, 0, fs->blocksize);
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60 |
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61 | jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
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62 | if (flags & EXT2_MKJOURNAL_V1_SUPER)
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63 | jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V1);
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64 | else
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65 | jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
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66 | jsb->s_blocksize = htonl(fs->blocksize);
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67 | jsb->s_maxlen = htonl(size);
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68 | jsb->s_nr_users = htonl(1);
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69 | jsb->s_first = htonl(1);
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70 | jsb->s_sequence = htonl(1);
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71 | memcpy(jsb->s_uuid, fs->super->s_uuid, sizeof(fs->super->s_uuid));
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72 | /*
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73 | * If we're creating an external journal device, we need to
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74 | * adjust these fields.
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75 | */
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76 | if (fs->super->s_feature_incompat &
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77 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
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78 | jsb->s_nr_users = 0;
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79 | if (fs->blocksize == 1024)
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80 | jsb->s_first = htonl(3);
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81 | else
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82 | jsb->s_first = htonl(2);
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83 | }
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84 |
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85 | *ret_jsb = (char *) jsb;
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86 | return 0;
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87 | }
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88 |
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89 | /*
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90 | * This function writes a journal using POSIX routines. It is used
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91 | * for creating external journals and creating journals on live
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92 | * filesystems.
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93 | */
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94 | static errcode_t write_journal_file(ext2_filsys fs, char *filename,
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95 | blk_t size, int flags)
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96 | {
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97 | errcode_t retval;
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98 | char *buf = NULL;
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99 | int fd, ret_size;
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100 | blk_t i;
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101 |
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102 | if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))
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103 | return retval;
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104 |
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105 | /* Open the device or journal file */
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106 | if ((fd = open(filename, O_WRONLY)) < 0) {
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107 | retval = errno;
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108 | goto errout;
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109 | }
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110 |
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111 | /* Write the superblock out */
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112 | retval = EXT2_ET_SHORT_WRITE;
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113 | ret_size = write(fd, buf, fs->blocksize);
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114 | if (ret_size < 0) {
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115 | retval = errno;
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116 | goto errout;
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117 | }
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118 | if (ret_size != (int) fs->blocksize)
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119 | goto errout;
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120 | memset(buf, 0, fs->blocksize);
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121 |
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122 | for (i = 1; i < size; i++) {
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123 | ret_size = write(fd, buf, fs->blocksize);
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124 | if (ret_size < 0) {
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125 | retval = errno;
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126 | goto errout;
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127 | }
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128 | if (ret_size != (int) fs->blocksize)
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129 | goto errout;
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130 | }
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131 | close(fd);
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132 |
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133 | retval = 0;
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134 | errout:
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135 | ext2fs_free_mem(&buf);
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136 | return retval;
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137 | }
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138 |
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139 | /*
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140 | * Helper function for creating the journal using direct I/O routines
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141 | */
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142 | struct mkjournal_struct {
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143 | int num_blocks;
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144 | int newblocks;
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145 | char *buf;
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146 | errcode_t err;
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147 | };
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148 |
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149 | static int mkjournal_proc(ext2_filsys fs,
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150 | blk_t *blocknr,
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151 | e2_blkcnt_t blockcnt,
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152 | blk_t ref_block EXT2FS_ATTR((unused)),
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153 | int ref_offset EXT2FS_ATTR((unused)),
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154 | void *priv_data)
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155 | {
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156 | struct mkjournal_struct *es = (struct mkjournal_struct *) priv_data;
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157 | blk_t new_blk;
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158 | static blk_t last_blk = 0;
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159 | errcode_t retval;
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160 |
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161 | if (*blocknr) {
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162 | last_blk = *blocknr;
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163 | return 0;
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164 | }
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165 | retval = ext2fs_new_block(fs, last_blk, 0, &new_blk);
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166 | if (retval) {
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167 | es->err = retval;
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168 | return BLOCK_ABORT;
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169 | }
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170 | if (blockcnt > 0)
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171 | es->num_blocks--;
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172 |
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173 | es->newblocks++;
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174 | retval = io_channel_write_blk(fs->io, new_blk, 1, es->buf);
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175 |
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176 | if (blockcnt == 0)
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177 | memset(es->buf, 0, fs->blocksize);
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178 |
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179 | if (retval) {
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180 | es->err = retval;
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181 | return BLOCK_ABORT;
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182 | }
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183 | *blocknr = new_blk;
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184 | last_blk = new_blk;
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185 | ext2fs_block_alloc_stats(fs, new_blk, +1);
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186 |
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187 | if (es->num_blocks == 0)
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188 | return (BLOCK_CHANGED | BLOCK_ABORT);
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189 | else
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190 | return BLOCK_CHANGED;
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191 | }
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192 |
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193 | /*
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194 | * This function creates a journal using direct I/O routines.
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195 | */
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196 | static errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino,
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197 | blk_t size, int flags)
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198 | {
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199 | char *buf;
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200 | errcode_t retval;
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201 | struct ext2_inode inode;
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202 | struct mkjournal_struct es;
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203 |
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204 | if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))
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205 | return retval;
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206 |
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207 | if ((retval = ext2fs_read_bitmaps(fs)))
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208 | return retval;
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209 |
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210 | if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
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211 | return retval;
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212 |
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213 | if (inode.i_blocks > 0)
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214 | return EEXIST;
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215 |
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216 | es.num_blocks = size;
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217 | es.newblocks = 0;
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218 | es.buf = buf;
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219 | es.err = 0;
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220 |
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221 | retval = ext2fs_block_iterate2(fs, journal_ino, BLOCK_FLAG_APPEND,
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222 | 0, mkjournal_proc, &es);
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223 | if (es.err) {
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224 | retval = es.err;
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225 | goto errout;
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226 | }
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227 |
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228 | if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
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229 | goto errout;
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230 |
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231 | inode.i_size += fs->blocksize * size;
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232 | inode.i_blocks += (fs->blocksize / 512) * es.newblocks;
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233 | inode.i_mtime = inode.i_ctime = time(NULL);
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234 | inode.i_links_count = 1;
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235 | inode.i_mode = LINUX_S_IFREG | 0600;
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236 |
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237 | if ((retval = ext2fs_write_inode(fs, journal_ino, &inode)))
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238 | goto errout;
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239 | retval = 0;
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240 |
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241 | memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
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242 | fs->super->s_jnl_blocks[16] = inode.i_size;
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243 | fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
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244 | ext2fs_mark_super_dirty(fs);
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245 |
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246 | errout:
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247 | ext2fs_free_mem(&buf);
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248 | return retval;
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249 | }
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250 |
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251 | /*
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252 | * This function adds a journal device to a filesystem
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253 | */
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254 | errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev)
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255 | {
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256 | struct stat st;
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257 | errcode_t retval;
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258 | char buf[1024];
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259 | journal_superblock_t *jsb;
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260 | int start;
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261 | __u32 i, nr_users;
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262 |
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263 | /* Make sure the device exists and is a block device */
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264 | if (stat(journal_dev->device_name, &st) < 0)
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265 | return errno;
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266 |
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267 | if (!S_ISBLK(st.st_mode))
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268 | return EXT2_ET_JOURNAL_NOT_BLOCK; /* Must be a block device */
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269 |
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270 | /* Get the journal superblock */
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271 | start = 1;
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272 | if (journal_dev->blocksize == 1024)
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273 | start++;
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274 | if ((retval = io_channel_read_blk(journal_dev->io, start, -1024, buf)))
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275 | return retval;
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276 |
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277 | jsb = (journal_superblock_t *) buf;
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278 | if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
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279 | (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2)))
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280 | return EXT2_ET_NO_JOURNAL_SB;
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281 |
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282 | if (ntohl(jsb->s_blocksize) != (unsigned long) fs->blocksize)
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283 | return EXT2_ET_UNEXPECTED_BLOCK_SIZE;
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284 |
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285 | /* Check and see if this filesystem has already been added */
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286 | nr_users = ntohl(jsb->s_nr_users);
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287 | for (i=0; i < nr_users; i++) {
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288 | if (memcmp(fs->super->s_uuid,
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289 | &jsb->s_users[i*16], 16) == 0)
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290 | break;
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291 | }
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292 | if (i >= nr_users) {
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293 | memcpy(&jsb->s_users[nr_users*16],
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294 | fs->super->s_uuid, 16);
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295 | jsb->s_nr_users = htonl(nr_users+1);
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296 | }
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297 |
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298 | /* Writeback the journal superblock */
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299 | if ((retval = io_channel_write_blk(journal_dev->io, start, -1024, buf)))
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300 | return retval;
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301 |
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302 | fs->super->s_journal_inum = 0;
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303 | fs->super->s_journal_dev = st.st_rdev;
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304 | memcpy(fs->super->s_journal_uuid, jsb->s_uuid,
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305 | sizeof(fs->super->s_journal_uuid));
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306 | fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
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307 | ext2fs_mark_super_dirty(fs);
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308 | return 0;
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309 | }
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310 |
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311 | /*
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312 | * This function adds a journal inode to a filesystem, using either
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313 | * POSIX routines if the filesystem is mounted, or using direct I/O
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314 | * functions if it is not.
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315 | */
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316 | errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t size, int flags)
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317 | {
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318 | errcode_t retval;
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319 | ext2_ino_t journal_ino;
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320 | struct stat st;
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321 | char jfile[1024];
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322 | int fd, mount_flags, f;
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323 |
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324 | retval = ext2fs_check_mount_point(fs->device_name, &mount_flags,
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325 | jfile, sizeof(jfile)-10);
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326 | if (retval)
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327 | return retval;
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328 |
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329 | if (mount_flags & EXT2_MF_MOUNTED) {
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330 | strcat(jfile, "/.journal");
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331 |
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332 | /*
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333 | * If .../.journal already exists, make sure any
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334 | * immutable or append-only flags are cleared.
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335 | */
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336 | #if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
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337 | (void) chflags (jfile, 0);
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338 | #else
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339 | #if HAVE_EXT2_IOCTLS
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340 | fd = open(jfile, O_RDONLY);
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341 | if (fd >= 0) {
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342 | f = 0;
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343 | ioctl(fd, EXT2_IOC_SETFLAGS, &f);
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344 | close(fd);
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345 | }
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346 | #endif
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347 | #endif
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348 |
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349 | /* Create the journal file */
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350 | if ((fd = open(jfile, O_CREAT|O_WRONLY, 0600)) < 0)
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351 | return errno;
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352 |
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353 | if ((retval = write_journal_file(fs, jfile, size, flags)))
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354 | goto errout;
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355 |
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356 | /* Get inode number of the journal file */
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357 | if (fstat(fd, &st) < 0)
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358 | goto errout;
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359 |
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360 | #if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
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361 | retval = fchflags (fd, UF_NODUMP|UF_IMMUTABLE);
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362 | #else
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363 | #if HAVE_EXT2_IOCTLS
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364 | f = EXT2_NODUMP_FL | EXT2_IMMUTABLE_FL;
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365 | retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
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366 | #endif
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367 | #endif
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368 | if (retval)
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369 | goto errout;
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370 |
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371 | close(fd);
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372 | journal_ino = st.st_ino;
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373 | } else {
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374 | journal_ino = EXT2_JOURNAL_INO;
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375 | if ((retval = write_journal_inode(fs, journal_ino,
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376 | size, flags)))
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377 | return retval;
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378 | }
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379 |
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380 | fs->super->s_journal_inum = journal_ino;
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381 | fs->super->s_journal_dev = 0;
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382 | memset(fs->super->s_journal_uuid, 0,
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383 | sizeof(fs->super->s_journal_uuid));
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384 | fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
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385 |
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386 | ext2fs_mark_super_dirty(fs);
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387 | return 0;
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388 | errout:
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389 | close(fd);
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390 | return retval;
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391 | }
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392 |
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393 | #ifdef DEBUG
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394 | main(int argc, char **argv)
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395 | {
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396 | errcode_t retval;
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397 | char *device_name;
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398 | ext2_filsys fs;
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399 |
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400 | if (argc < 2) {
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401 | fprintf(stderr, "Usage: %s filesystem\n", argv[0]);
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402 | exit(1);
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403 | }
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404 | device_name = argv[1];
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405 |
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406 | retval = ext2fs_open (device_name, EXT2_FLAG_RW, 0, 0,
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407 | unix_io_manager, &fs);
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408 | if (retval) {
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409 | com_err(argv[0], retval, "while opening %s", device_name);
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410 | exit(1);
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411 | }
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412 |
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413 | retval = ext2fs_add_journal_inode(fs, 1024);
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414 | if (retval) {
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415 | com_err(argv[0], retval, "while adding journal to %s",
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416 | device_name);
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417 | exit(1);
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418 | }
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419 | retval = ext2fs_flush(fs);
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420 | if (retval) {
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421 | printf("Warning, had trouble writing out superblocks.\n");
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422 | }
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423 | ext2fs_close(fs);
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424 | exit(0);
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425 | }
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426 | #endif
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