Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 1 | /* |
| 2 | * mkjournal.c --- make a journal for a filesystem |
| 3 | * |
| 4 | * Copyright (C) 2000 Theodore Ts'o. |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 5 | * |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 6 | * %Begin-Header% |
| 7 | * This file may be redistributed under the terms of the GNU Public |
| 8 | * License. |
| 9 | * %End-Header% |
| 10 | */ |
| 11 | |
| 12 | #include <stdio.h> |
| 13 | #include <string.h> |
| 14 | #if HAVE_UNISTD_H |
| 15 | #include <unistd.h> |
| 16 | #endif |
| 17 | #if HAVE_ERRNO_H |
| 18 | #include <errno.h> |
| 19 | #endif |
| 20 | #include <fcntl.h> |
| 21 | #include <time.h> |
| 22 | #if HAVE_SYS_STAT_H |
| 23 | #include <sys/stat.h> |
| 24 | #endif |
| 25 | #if HAVE_SYS_TYPES_H |
| 26 | #include <sys/types.h> |
| 27 | #endif |
| 28 | #if HAVE_SYS_IOCTL_H |
| 29 | #include <sys/ioctl.h> |
| 30 | #endif |
| 31 | #if HAVE_NETINET_IN_H |
| 32 | #include <netinet/in.h> |
| 33 | #endif |
| 34 | |
| 35 | #include "ext2_fs.h" |
"Vladimir N. Oleynik" | 083d3f4 | 2005-10-10 11:35:17 +0000 | [diff] [blame] | 36 | #include "../e2p/e2p.h" |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 37 | #include "ext2fs.h" |
| 38 | #include "jfs_user.h" |
| 39 | |
| 40 | /* |
| 41 | * This function automatically sets up the journal superblock and |
| 42 | * returns it as an allocated block. |
| 43 | */ |
| 44 | errcode_t ext2fs_create_journal_superblock(ext2_filsys fs, |
| 45 | __u32 size, int flags, |
| 46 | char **ret_jsb) |
| 47 | { |
| 48 | errcode_t retval; |
| 49 | journal_superblock_t *jsb; |
| 50 | |
| 51 | if (size < 1024) |
| 52 | return EXT2_ET_JOURNAL_TOO_SMALL; |
| 53 | |
| 54 | if ((retval = ext2fs_get_mem(fs->blocksize, &jsb))) |
| 55 | return retval; |
| 56 | |
| 57 | memset (jsb, 0, fs->blocksize); |
| 58 | |
| 59 | jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER); |
| 60 | if (flags & EXT2_MKJOURNAL_V1_SUPER) |
| 61 | jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V1); |
| 62 | else |
| 63 | jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2); |
| 64 | jsb->s_blocksize = htonl(fs->blocksize); |
| 65 | jsb->s_maxlen = htonl(size); |
| 66 | jsb->s_nr_users = htonl(1); |
| 67 | jsb->s_first = htonl(1); |
| 68 | jsb->s_sequence = htonl(1); |
| 69 | memcpy(jsb->s_uuid, fs->super->s_uuid, sizeof(fs->super->s_uuid)); |
| 70 | /* |
| 71 | * If we're creating an external journal device, we need to |
| 72 | * adjust these fields. |
| 73 | */ |
| 74 | if (fs->super->s_feature_incompat & |
| 75 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) { |
| 76 | jsb->s_nr_users = 0; |
| 77 | if (fs->blocksize == 1024) |
| 78 | jsb->s_first = htonl(3); |
| 79 | else |
| 80 | jsb->s_first = htonl(2); |
| 81 | } |
| 82 | |
| 83 | *ret_jsb = (char *) jsb; |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | /* |
| 88 | * This function writes a journal using POSIX routines. It is used |
| 89 | * for creating external journals and creating journals on live |
| 90 | * filesystems. |
| 91 | */ |
| 92 | static errcode_t write_journal_file(ext2_filsys fs, char *filename, |
| 93 | blk_t size, int flags) |
| 94 | { |
| 95 | errcode_t retval; |
| 96 | char *buf = 0; |
| 97 | int fd, ret_size; |
| 98 | blk_t i; |
| 99 | |
| 100 | if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf))) |
| 101 | return retval; |
| 102 | |
| 103 | /* Open the device or journal file */ |
| 104 | if ((fd = open(filename, O_WRONLY)) < 0) { |
| 105 | retval = errno; |
| 106 | goto errout; |
| 107 | } |
| 108 | |
| 109 | /* Write the superblock out */ |
| 110 | retval = EXT2_ET_SHORT_WRITE; |
| 111 | ret_size = write(fd, buf, fs->blocksize); |
| 112 | if (ret_size < 0) { |
| 113 | retval = errno; |
| 114 | goto errout; |
| 115 | } |
| 116 | if (ret_size != (int) fs->blocksize) |
| 117 | goto errout; |
| 118 | memset(buf, 0, fs->blocksize); |
| 119 | |
| 120 | for (i = 1; i < size; i++) { |
| 121 | ret_size = write(fd, buf, fs->blocksize); |
| 122 | if (ret_size < 0) { |
| 123 | retval = errno; |
| 124 | goto errout; |
| 125 | } |
| 126 | if (ret_size != (int) fs->blocksize) |
| 127 | goto errout; |
| 128 | } |
| 129 | close(fd); |
| 130 | |
| 131 | retval = 0; |
| 132 | errout: |
| 133 | ext2fs_free_mem(&buf); |
| 134 | return retval; |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Helper function for creating the journal using direct I/O routines |
| 139 | */ |
| 140 | struct mkjournal_struct { |
| 141 | int num_blocks; |
| 142 | int newblocks; |
| 143 | char *buf; |
| 144 | errcode_t err; |
| 145 | }; |
| 146 | |
| 147 | static int mkjournal_proc(ext2_filsys fs, |
| 148 | blk_t *blocknr, |
| 149 | e2_blkcnt_t blockcnt, |
| 150 | blk_t ref_block EXT2FS_ATTR((unused)), |
| 151 | int ref_offset EXT2FS_ATTR((unused)), |
| 152 | void *priv_data) |
| 153 | { |
| 154 | struct mkjournal_struct *es = (struct mkjournal_struct *) priv_data; |
| 155 | blk_t new_blk; |
| 156 | static blk_t last_blk = 0; |
| 157 | errcode_t retval; |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 158 | |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 159 | if (*blocknr) { |
| 160 | last_blk = *blocknr; |
| 161 | return 0; |
| 162 | } |
| 163 | retval = ext2fs_new_block(fs, last_blk, 0, &new_blk); |
| 164 | if (retval) { |
| 165 | es->err = retval; |
| 166 | return BLOCK_ABORT; |
| 167 | } |
| 168 | if (blockcnt > 0) |
| 169 | es->num_blocks--; |
| 170 | |
| 171 | es->newblocks++; |
| 172 | retval = io_channel_write_blk(fs->io, new_blk, 1, es->buf); |
| 173 | |
| 174 | if (blockcnt == 0) |
| 175 | memset(es->buf, 0, fs->blocksize); |
| 176 | |
| 177 | if (retval) { |
| 178 | es->err = retval; |
| 179 | return BLOCK_ABORT; |
| 180 | } |
| 181 | *blocknr = new_blk; |
| 182 | last_blk = new_blk; |
| 183 | ext2fs_block_alloc_stats(fs, new_blk, +1); |
| 184 | |
| 185 | if (es->num_blocks == 0) |
| 186 | return (BLOCK_CHANGED | BLOCK_ABORT); |
| 187 | else |
| 188 | return BLOCK_CHANGED; |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 189 | |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | /* |
| 193 | * This function creates a journal using direct I/O routines. |
| 194 | */ |
| 195 | static errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino, |
| 196 | blk_t size, int flags) |
| 197 | { |
| 198 | char *buf; |
| 199 | errcode_t retval; |
| 200 | struct ext2_inode inode; |
| 201 | struct mkjournal_struct es; |
| 202 | |
| 203 | if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf))) |
| 204 | return retval; |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 205 | |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 206 | if ((retval = ext2fs_read_bitmaps(fs))) |
| 207 | return retval; |
| 208 | |
| 209 | if ((retval = ext2fs_read_inode(fs, journal_ino, &inode))) |
| 210 | return retval; |
| 211 | |
| 212 | if (inode.i_blocks > 0) |
| 213 | return EEXIST; |
| 214 | |
| 215 | es.num_blocks = size; |
| 216 | es.newblocks = 0; |
| 217 | es.buf = buf; |
| 218 | es.err = 0; |
| 219 | |
| 220 | retval = ext2fs_block_iterate2(fs, journal_ino, BLOCK_FLAG_APPEND, |
| 221 | 0, mkjournal_proc, &es); |
| 222 | if (es.err) { |
| 223 | retval = es.err; |
| 224 | goto errout; |
| 225 | } |
| 226 | |
| 227 | if ((retval = ext2fs_read_inode(fs, journal_ino, &inode))) |
| 228 | goto errout; |
| 229 | |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 230 | inode.i_size += fs->blocksize * size; |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 231 | inode.i_blocks += (fs->blocksize / 512) * es.newblocks; |
| 232 | inode.i_mtime = inode.i_ctime = time(0); |
| 233 | inode.i_links_count = 1; |
| 234 | inode.i_mode = LINUX_S_IFREG | 0600; |
| 235 | |
| 236 | if ((retval = ext2fs_write_inode(fs, journal_ino, &inode))) |
| 237 | goto errout; |
| 238 | retval = 0; |
| 239 | |
| 240 | memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4); |
| 241 | fs->super->s_jnl_blocks[16] = inode.i_size; |
| 242 | fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS; |
| 243 | ext2fs_mark_super_dirty(fs); |
| 244 | |
| 245 | errout: |
| 246 | ext2fs_free_mem(&buf); |
| 247 | return retval; |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * This function adds a journal device to a filesystem |
| 252 | */ |
| 253 | errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev) |
| 254 | { |
| 255 | struct stat st; |
| 256 | errcode_t retval; |
| 257 | char buf[1024]; |
| 258 | journal_superblock_t *jsb; |
| 259 | int start; |
| 260 | __u32 i, nr_users; |
| 261 | |
| 262 | /* Make sure the device exists and is a block device */ |
| 263 | if (stat(journal_dev->device_name, &st) < 0) |
| 264 | return errno; |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 265 | |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 266 | if (!S_ISBLK(st.st_mode)) |
| 267 | return EXT2_ET_JOURNAL_NOT_BLOCK; /* Must be a block device */ |
| 268 | |
| 269 | /* Get the journal superblock */ |
| 270 | start = 1; |
| 271 | if (journal_dev->blocksize == 1024) |
| 272 | start++; |
| 273 | if ((retval = io_channel_read_blk(journal_dev->io, start, -1024, buf))) |
| 274 | return retval; |
| 275 | |
| 276 | jsb = (journal_superblock_t *) buf; |
| 277 | if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) || |
| 278 | (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2))) |
| 279 | return EXT2_ET_NO_JOURNAL_SB; |
| 280 | |
| 281 | if (ntohl(jsb->s_blocksize) != (unsigned long) fs->blocksize) |
| 282 | return EXT2_ET_UNEXPECTED_BLOCK_SIZE; |
| 283 | |
| 284 | /* Check and see if this filesystem has already been added */ |
| 285 | nr_users = ntohl(jsb->s_nr_users); |
| 286 | for (i=0; i < nr_users; i++) { |
| 287 | if (memcmp(fs->super->s_uuid, |
| 288 | &jsb->s_users[i*16], 16) == 0) |
| 289 | break; |
| 290 | } |
| 291 | if (i >= nr_users) { |
| 292 | memcpy(&jsb->s_users[nr_users*16], |
| 293 | fs->super->s_uuid, 16); |
| 294 | jsb->s_nr_users = htonl(nr_users+1); |
| 295 | } |
| 296 | |
| 297 | /* Writeback the journal superblock */ |
| 298 | if ((retval = io_channel_write_blk(journal_dev->io, start, -1024, buf))) |
| 299 | return retval; |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 300 | |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 301 | fs->super->s_journal_inum = 0; |
| 302 | fs->super->s_journal_dev = st.st_rdev; |
| 303 | memcpy(fs->super->s_journal_uuid, jsb->s_uuid, |
| 304 | sizeof(fs->super->s_journal_uuid)); |
| 305 | fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL; |
| 306 | ext2fs_mark_super_dirty(fs); |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | /* |
| 311 | * This function adds a journal inode to a filesystem, using either |
| 312 | * POSIX routines if the filesystem is mounted, or using direct I/O |
| 313 | * functions if it is not. |
| 314 | */ |
| 315 | errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t size, int flags) |
| 316 | { |
| 317 | errcode_t retval; |
| 318 | ext2_ino_t journal_ino; |
| 319 | struct stat st; |
| 320 | char jfile[1024]; |
| 321 | int fd, mount_flags, f; |
| 322 | |
| 323 | if ((retval = ext2fs_check_mount_point(fs->device_name, &mount_flags, |
| 324 | jfile, sizeof(jfile)-10))) |
| 325 | return retval; |
| 326 | |
| 327 | if (mount_flags & EXT2_MF_MOUNTED) { |
| 328 | strcat(jfile, "/.journal"); |
| 329 | |
| 330 | /* |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 331 | * If .../.journal already exists, make sure any |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 332 | * immutable or append-only flags are cleared. |
| 333 | */ |
| 334 | #if defined(HAVE_CHFLAGS) && defined(UF_NODUMP) |
| 335 | (void) chflags (jfile, 0); |
| 336 | #else |
| 337 | #if HAVE_EXT2_IOCTLS |
| 338 | fd = open(jfile, O_RDONLY); |
| 339 | if (fd >= 0) { |
| 340 | f = 0; |
| 341 | ioctl(fd, EXT2_IOC_SETFLAGS, &f); |
| 342 | close(fd); |
| 343 | } |
| 344 | #endif |
| 345 | #endif |
| 346 | |
| 347 | /* Create the journal file */ |
| 348 | if ((fd = open(jfile, O_CREAT|O_WRONLY, 0600)) < 0) |
| 349 | return errno; |
| 350 | |
| 351 | if ((retval = write_journal_file(fs, jfile, size, flags))) |
| 352 | goto errout; |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 353 | |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 354 | /* Get inode number of the journal file */ |
| 355 | if (fstat(fd, &st) < 0) |
| 356 | goto errout; |
| 357 | |
| 358 | #if defined(HAVE_CHFLAGS) && defined(UF_NODUMP) |
| 359 | retval = fchflags (fd, UF_NODUMP|UF_IMMUTABLE); |
| 360 | #else |
| 361 | #if HAVE_EXT2_IOCTLS |
| 362 | f = EXT2_NODUMP_FL | EXT2_IMMUTABLE_FL; |
| 363 | retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f); |
| 364 | #endif |
| 365 | #endif |
| 366 | if (retval) |
| 367 | goto errout; |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 368 | |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 369 | close(fd); |
| 370 | journal_ino = st.st_ino; |
| 371 | } else { |
| 372 | journal_ino = EXT2_JOURNAL_INO; |
| 373 | if ((retval = write_journal_inode(fs, journal_ino, |
| 374 | size, flags))) |
| 375 | return retval; |
| 376 | } |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 377 | |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 378 | fs->super->s_journal_inum = journal_ino; |
| 379 | fs->super->s_journal_dev = 0; |
| 380 | memset(fs->super->s_journal_uuid, 0, |
| 381 | sizeof(fs->super->s_journal_uuid)); |
| 382 | fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL; |
| 383 | |
| 384 | ext2fs_mark_super_dirty(fs); |
| 385 | return 0; |
| 386 | errout: |
| 387 | close(fd); |
| 388 | return retval; |
| 389 | } |
| 390 | |
| 391 | #ifdef DEBUG |
| 392 | main(int argc, char **argv) |
| 393 | { |
| 394 | errcode_t retval; |
| 395 | char *device_name; |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 396 | ext2_filsys fs; |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 397 | |
| 398 | if (argc < 2) { |
| 399 | fprintf(stderr, "Usage: %s filesystem\n", argv[0]); |
| 400 | exit(1); |
| 401 | } |
| 402 | device_name = argv[1]; |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 403 | |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 404 | retval = ext2fs_open (device_name, EXT2_FLAG_RW, 0, 0, |
| 405 | unix_io_manager, &fs); |
| 406 | if (retval) { |
| 407 | com_err(argv[0], retval, "while opening %s", device_name); |
| 408 | exit(1); |
| 409 | } |
| 410 | |
| 411 | retval = ext2fs_add_journal_inode(fs, 1024); |
| 412 | if (retval) { |
| 413 | com_err(argv[0], retval, "while adding journal to %s", |
| 414 | device_name); |
| 415 | exit(1); |
| 416 | } |
| 417 | retval = ext2fs_flush(fs); |
| 418 | if (retval) { |
| 419 | printf("Warning, had trouble writing out superblocks.\n"); |
| 420 | } |
| 421 | ext2fs_close(fs); |
| 422 | exit(0); |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame^] | 423 | |
Mike Frysinger | 1fd98e0 | 2005-05-09 22:10:42 +0000 | [diff] [blame] | 424 | } |
| 425 | #endif |