Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/ntfs/logfile.c
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1 /* 2 * logfile.c - NTFS kernel journal handling. Part of the Linux-NTFS project. 3 * 4 * Copyright (c) 2002-2007 Anton Altaparmakov 5 * 6 * This program/include file is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as published 8 * by the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program/include file is distributed in the hope that it will be 12 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty 13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program (in the main directory of the Linux-NTFS 18 * distribution in the file COPYING); if not, write to the Free Software 19 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22 #ifdef NTFS_RW 23 24 #include <linux/types.h> 25 #include <linux/fs.h> 26 #include <linux/highmem.h> 27 #include <linux/buffer_head.h> 28 #include <linux/bitops.h> 29 #include <linux/log2.h> 30 31 #include "attrib.h" 32 #include "aops.h" 33 #include "debug.h" 34 #include "logfile.h" 35 #include "malloc.h" 36 #include "volume.h" 37 #include "ntfs.h" 38 39 /** 40 * ntfs_check_restart_page_header - check the page header for consistency 41 * @vi: $LogFile inode to which the restart page header belongs 42 * @rp: restart page header to check 43 * @pos: position in @vi at which the restart page header resides 44 * 45 * Check the restart page header @rp for consistency and return 'true' if it is 46 * consistent and 'false' otherwise. 47 * 48 * This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not 49 * require the full restart page. 50 */ 51 static bool ntfs_check_restart_page_header(struct inode *vi, 52 RESTART_PAGE_HEADER *rp, s64 pos) 53 { 54 u32 logfile_system_page_size, logfile_log_page_size; 55 u16 ra_ofs, usa_count, usa_ofs, usa_end = 0; 56 bool have_usa = true; 57 58 ntfs_debug("Entering."); 59 /* 60 * If the system or log page sizes are smaller than the ntfs block size 61 * or either is not a power of 2 we cannot handle this log file. 62 */ 63 logfile_system_page_size = le32_to_cpu(rp->system_page_size); 64 logfile_log_page_size = le32_to_cpu(rp->log_page_size); 65 if (logfile_system_page_size < NTFS_BLOCK_SIZE || 66 logfile_log_page_size < NTFS_BLOCK_SIZE || 67 logfile_system_page_size & 68 (logfile_system_page_size - 1) || 69 !is_power_of_2(logfile_log_page_size)) { 70 ntfs_error(vi->i_sb, "$LogFile uses unsupported page size."); 71 return false; 72 } 73 /* 74 * We must be either at !pos (1st restart page) or at pos = system page 75 * size (2nd restart page). 76 */ 77 if (pos && pos != logfile_system_page_size) { 78 ntfs_error(vi->i_sb, "Found restart area in incorrect " 79 "position in $LogFile."); 80 return false; 81 } 82 /* We only know how to handle version 1.1. */ 83 if (sle16_to_cpu(rp->major_ver) != 1 || 84 sle16_to_cpu(rp->minor_ver) != 1) { 85 ntfs_error(vi->i_sb, "$LogFile version %i.%i is not " 86 "supported. (This driver supports version " 87 "1.1 only.)", (int)sle16_to_cpu(rp->major_ver), 88 (int)sle16_to_cpu(rp->minor_ver)); 89 return false; 90 } 91 /* 92 * If chkdsk has been run the restart page may not be protected by an 93 * update sequence array. 94 */ 95 if (ntfs_is_chkd_record(rp->magic) && !le16_to_cpu(rp->usa_count)) { 96 have_usa = false; 97 goto skip_usa_checks; 98 } 99 /* Verify the size of the update sequence array. */ 100 usa_count = 1 + (logfile_system_page_size >> NTFS_BLOCK_SIZE_BITS); 101 if (usa_count != le16_to_cpu(rp->usa_count)) { 102 ntfs_error(vi->i_sb, "$LogFile restart page specifies " 103 "inconsistent update sequence array count."); 104 return false; 105 } 106 /* Verify the position of the update sequence array. */ 107 usa_ofs = le16_to_cpu(rp->usa_ofs); 108 usa_end = usa_ofs + usa_count * sizeof(u16); 109 if (usa_ofs < sizeof(RESTART_PAGE_HEADER) || 110 usa_end > NTFS_BLOCK_SIZE - sizeof(u16)) { 111 ntfs_error(vi->i_sb, "$LogFile restart page specifies " 112 "inconsistent update sequence array offset."); 113 return false; 114 } 115 skip_usa_checks: 116 /* 117 * Verify the position of the restart area. It must be: 118 * - aligned to 8-byte boundary, 119 * - after the update sequence array, and 120 * - within the system page size. 121 */ 122 ra_ofs = le16_to_cpu(rp->restart_area_offset); 123 if (ra_ofs & 7 || (have_usa ? ra_ofs < usa_end : 124 ra_ofs < sizeof(RESTART_PAGE_HEADER)) || 125 ra_ofs > logfile_system_page_size) { 126 ntfs_error(vi->i_sb, "$LogFile restart page specifies " 127 "inconsistent restart area offset."); 128 return false; 129 } 130 /* 131 * Only restart pages modified by chkdsk are allowed to have chkdsk_lsn 132 * set. 133 */ 134 if (!ntfs_is_chkd_record(rp->magic) && sle64_to_cpu(rp->chkdsk_lsn)) { 135 ntfs_error(vi->i_sb, "$LogFile restart page is not modified " 136 "by chkdsk but a chkdsk LSN is specified."); 137 return false; 138 } 139 ntfs_debug("Done."); 140 return true; 141 } 142 143 /** 144 * ntfs_check_restart_area - check the restart area for consistency 145 * @vi: $LogFile inode to which the restart page belongs 146 * @rp: restart page whose restart area to check 147 * 148 * Check the restart area of the restart page @rp for consistency and return 149 * 'true' if it is consistent and 'false' otherwise. 150 * 151 * This function assumes that the restart page header has already been 152 * consistency checked. 153 * 154 * This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not 155 * require the full restart page. 156 */ 157 static bool ntfs_check_restart_area(struct inode *vi, RESTART_PAGE_HEADER *rp) 158 { 159 u64 file_size; 160 RESTART_AREA *ra; 161 u16 ra_ofs, ra_len, ca_ofs; 162 u8 fs_bits; 163 164 ntfs_debug("Entering."); 165 ra_ofs = le16_to_cpu(rp->restart_area_offset); 166 ra = (RESTART_AREA*)((u8*)rp + ra_ofs); 167 /* 168 * Everything before ra->file_size must be before the first word 169 * protected by an update sequence number. This ensures that it is 170 * safe to access ra->client_array_offset. 171 */ 172 if (ra_ofs + offsetof(RESTART_AREA, file_size) > 173 NTFS_BLOCK_SIZE - sizeof(u16)) { 174 ntfs_error(vi->i_sb, "$LogFile restart area specifies " 175 "inconsistent file offset."); 176 return false; 177 } 178 /* 179 * Now that we can access ra->client_array_offset, make sure everything 180 * up to the log client array is before the first word protected by an 181 * update sequence number. This ensures we can access all of the 182 * restart area elements safely. Also, the client array offset must be 183 * aligned to an 8-byte boundary. 184 */ 185 ca_ofs = le16_to_cpu(ra->client_array_offset); 186 if (((ca_ofs + 7) & ~7) != ca_ofs || 187 ra_ofs + ca_ofs > NTFS_BLOCK_SIZE - sizeof(u16)) { 188 ntfs_error(vi->i_sb, "$LogFile restart area specifies " 189 "inconsistent client array offset."); 190 return false; 191 } 192 /* 193 * The restart area must end within the system page size both when 194 * calculated manually and as specified by ra->restart_area_length. 195 * Also, the calculated length must not exceed the specified length. 196 */ 197 ra_len = ca_ofs + le16_to_cpu(ra->log_clients) * 198 sizeof(LOG_CLIENT_RECORD); 199 if (ra_ofs + ra_len > le32_to_cpu(rp->system_page_size) || 200 ra_ofs + le16_to_cpu(ra->restart_area_length) > 201 le32_to_cpu(rp->system_page_size) || 202 ra_len > le16_to_cpu(ra->restart_area_length)) { 203 ntfs_error(vi->i_sb, "$LogFile restart area is out of bounds " 204 "of the system page size specified by the " 205 "restart page header and/or the specified " 206 "restart area length is inconsistent."); 207 return false; 208 } 209 /* 210 * The ra->client_free_list and ra->client_in_use_list must be either 211 * LOGFILE_NO_CLIENT or less than ra->log_clients or they are 212 * overflowing the client array. 213 */ 214 if ((ra->client_free_list != LOGFILE_NO_CLIENT && 215 le16_to_cpu(ra->client_free_list) >= 216 le16_to_cpu(ra->log_clients)) || 217 (ra->client_in_use_list != LOGFILE_NO_CLIENT && 218 le16_to_cpu(ra->client_in_use_list) >= 219 le16_to_cpu(ra->log_clients))) { 220 ntfs_error(vi->i_sb, "$LogFile restart area specifies " 221 "overflowing client free and/or in use lists."); 222 return false; 223 } 224 /* 225 * Check ra->seq_number_bits against ra->file_size for consistency. 226 * We cannot just use ffs() because the file size is not a power of 2. 227 */ 228 file_size = (u64)sle64_to_cpu(ra->file_size); 229 fs_bits = 0; 230 while (file_size) { 231 file_size >>= 1; 232 fs_bits++; 233 } 234 if (le32_to_cpu(ra->seq_number_bits) != 67 - fs_bits) { 235 ntfs_error(vi->i_sb, "$LogFile restart area specifies " 236 "inconsistent sequence number bits."); 237 return false; 238 } 239 /* The log record header length must be a multiple of 8. */ 240 if (((le16_to_cpu(ra->log_record_header_length) + 7) & ~7) != 241 le16_to_cpu(ra->log_record_header_length)) { 242 ntfs_error(vi->i_sb, "$LogFile restart area specifies " 243 "inconsistent log record header length."); 244 return false; 245 } 246 /* Dito for the log page data offset. */ 247 if (((le16_to_cpu(ra->log_page_data_offset) + 7) & ~7) != 248 le16_to_cpu(ra->log_page_data_offset)) { 249 ntfs_error(vi->i_sb, "$LogFile restart area specifies " 250 "inconsistent log page data offset."); 251 return false; 252 } 253 ntfs_debug("Done."); 254 return true; 255 } 256 257 /** 258 * ntfs_check_log_client_array - check the log client array for consistency 259 * @vi: $LogFile inode to which the restart page belongs 260 * @rp: restart page whose log client array to check 261 * 262 * Check the log client array of the restart page @rp for consistency and 263 * return 'true' if it is consistent and 'false' otherwise. 264 * 265 * This function assumes that the restart page header and the restart area have 266 * already been consistency checked. 267 * 268 * Unlike ntfs_check_restart_page_header() and ntfs_check_restart_area(), this 269 * function needs @rp->system_page_size bytes in @rp, i.e. it requires the full 270 * restart page and the page must be multi sector transfer deprotected. 271 */ 272 static bool ntfs_check_log_client_array(struct inode *vi, 273 RESTART_PAGE_HEADER *rp) 274 { 275 RESTART_AREA *ra; 276 LOG_CLIENT_RECORD *ca, *cr; 277 u16 nr_clients, idx; 278 bool in_free_list, idx_is_first; 279 280 ntfs_debug("Entering."); 281 ra = (RESTART_AREA*)((u8*)rp + le16_to_cpu(rp->restart_area_offset)); 282 ca = (LOG_CLIENT_RECORD*)((u8*)ra + 283 le16_to_cpu(ra->client_array_offset)); 284 /* 285 * Check the ra->client_free_list first and then check the 286 * ra->client_in_use_list. Check each of the log client records in 287 * each of the lists and check that the array does not overflow the 288 * ra->log_clients value. Also keep track of the number of records 289 * visited as there cannot be more than ra->log_clients records and 290 * that way we detect eventual loops in within a list. 291 */ 292 nr_clients = le16_to_cpu(ra->log_clients); 293 idx = le16_to_cpu(ra->client_free_list); 294 in_free_list = true; 295 check_list: 296 for (idx_is_first = true; idx != LOGFILE_NO_CLIENT_CPU; nr_clients--, 297 idx = le16_to_cpu(cr->next_client)) { 298 if (!nr_clients || idx >= le16_to_cpu(ra->log_clients)) 299 goto err_out; 300 /* Set @cr to the current log client record. */ 301 cr = ca + idx; 302 /* The first log client record must not have a prev_client. */ 303 if (idx_is_first) { 304 if (cr->prev_client != LOGFILE_NO_CLIENT) 305 goto err_out; 306 idx_is_first = false; 307 } 308 } 309 /* Switch to and check the in use list if we just did the free list. */ 310 if (in_free_list) { 311 in_free_list = false; 312 idx = le16_to_cpu(ra->client_in_use_list); 313 goto check_list; 314 } 315 ntfs_debug("Done."); 316 return true; 317 err_out: 318 ntfs_error(vi->i_sb, "$LogFile log client array is corrupt."); 319 return false; 320 } 321 322 /** 323 * ntfs_check_and_load_restart_page - check the restart page for consistency 324 * @vi: $LogFile inode to which the restart page belongs 325 * @rp: restart page to check 326 * @pos: position in @vi at which the restart page resides 327 * @wrp: [OUT] copy of the multi sector transfer deprotected restart page 328 * @lsn: [OUT] set to the current logfile lsn on success 329 * 330 * Check the restart page @rp for consistency and return 0 if it is consistent 331 * and -errno otherwise. The restart page may have been modified by chkdsk in 332 * which case its magic is CHKD instead of RSTR. 333 * 334 * This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not 335 * require the full restart page. 336 * 337 * If @wrp is not NULL, on success, *@wrp will point to a buffer containing a 338 * copy of the complete multi sector transfer deprotected page. On failure, 339 * *@wrp is undefined. 340 * 341 * Simillarly, if @lsn is not NULL, on success *@lsn will be set to the current 342 * logfile lsn according to this restart page. On failure, *@lsn is undefined. 343 * 344 * The following error codes are defined: 345 * -EINVAL - The restart page is inconsistent. 346 * -ENOMEM - Not enough memory to load the restart page. 347 * -EIO - Failed to reading from $LogFile. 348 */ 349 static int ntfs_check_and_load_restart_page(struct inode *vi, 350 RESTART_PAGE_HEADER *rp, s64 pos, RESTART_PAGE_HEADER **wrp, 351 LSN *lsn) 352 { 353 RESTART_AREA *ra; 354 RESTART_PAGE_HEADER *trp; 355 int size, err; 356 357 ntfs_debug("Entering."); 358 /* Check the restart page header for consistency. */ 359 if (!ntfs_check_restart_page_header(vi, rp, pos)) { 360 /* Error output already done inside the function. */ 361 return -EINVAL; 362 } 363 /* Check the restart area for consistency. */ 364 if (!ntfs_check_restart_area(vi, rp)) { 365 /* Error output already done inside the function. */ 366 return -EINVAL; 367 } 368 ra = (RESTART_AREA*)((u8*)rp + le16_to_cpu(rp->restart_area_offset)); 369 /* 370 * Allocate a buffer to store the whole restart page so we can multi 371 * sector transfer deprotect it. 372 */ 373 trp = ntfs_malloc_nofs(le32_to_cpu(rp->system_page_size)); 374 if (!trp) { 375 ntfs_error(vi->i_sb, "Failed to allocate memory for $LogFile " 376 "restart page buffer."); 377 return -ENOMEM; 378 } 379 /* 380 * Read the whole of the restart page into the buffer. If it fits 381 * completely inside @rp, just copy it from there. Otherwise map all 382 * the required pages and copy the data from them. 383 */ 384 size = PAGE_CACHE_SIZE - (pos & ~PAGE_CACHE_MASK); 385 if (size >= le32_to_cpu(rp->system_page_size)) { 386 memcpy(trp, rp, le32_to_cpu(rp->system_page_size)); 387 } else { 388 pgoff_t idx; 389 struct page *page; 390 int have_read, to_read; 391 392 /* First copy what we already have in @rp. */ 393 memcpy(trp, rp, size); 394 /* Copy the remaining data one page at a time. */ 395 have_read = size; 396 to_read = le32_to_cpu(rp->system_page_size) - size; 397 idx = (pos + size) >> PAGE_CACHE_SHIFT; 398 BUG_ON((pos + size) & ~PAGE_CACHE_MASK); 399 do { 400 page = ntfs_map_page(vi->i_mapping, idx); 401 if (IS_ERR(page)) { 402 ntfs_error(vi->i_sb, "Error mapping $LogFile " 403 "page (index %lu).", idx); 404 err = PTR_ERR(page); 405 if (err != -EIO && err != -ENOMEM) 406 err = -EIO; 407 goto err_out; 408 } 409 size = min_t(int, to_read, PAGE_CACHE_SIZE); 410 memcpy((u8*)trp + have_read, page_address(page), size); 411 ntfs_unmap_page(page); 412 have_read += size; 413 to_read -= size; 414 idx++; 415 } while (to_read > 0); 416 } 417 /* 418 * Perform the multi sector transfer deprotection on the buffer if the 419 * restart page is protected. 420 */ 421 if ((!ntfs_is_chkd_record(trp->magic) || le16_to_cpu(trp->usa_count)) 422 && post_read_mst_fixup((NTFS_RECORD*)trp, 423 le32_to_cpu(rp->system_page_size))) { 424 /* 425 * A multi sector tranfer error was detected. We only need to 426 * abort if the restart page contents exceed the multi sector 427 * transfer fixup of the first sector. 428 */ 429 if (le16_to_cpu(rp->restart_area_offset) + 430 le16_to_cpu(ra->restart_area_length) > 431 NTFS_BLOCK_SIZE - sizeof(u16)) { 432 ntfs_error(vi->i_sb, "Multi sector transfer error " 433 "detected in $LogFile restart page."); 434 err = -EINVAL; 435 goto err_out; 436 } 437 } 438 /* 439 * If the restart page is modified by chkdsk or there are no active 440 * logfile clients, the logfile is consistent. Otherwise, need to 441 * check the log client records for consistency, too. 442 */ 443 err = 0; 444 if (ntfs_is_rstr_record(rp->magic) && 445 ra->client_in_use_list != LOGFILE_NO_CLIENT) { 446 if (!ntfs_check_log_client_array(vi, trp)) { 447 err = -EINVAL; 448 goto err_out; 449 } 450 } 451 if (lsn) { 452 if (ntfs_is_rstr_record(rp->magic)) 453 *lsn = sle64_to_cpu(ra->current_lsn); 454 else /* if (ntfs_is_chkd_record(rp->magic)) */ 455 *lsn = sle64_to_cpu(rp->chkdsk_lsn); 456 } 457 ntfs_debug("Done."); 458 if (wrp) 459 *wrp = trp; 460 else { 461 err_out: 462 ntfs_free(trp); 463 } 464 return err; 465 } 466 467 /** 468 * ntfs_check_logfile - check the journal for consistency 469 * @log_vi: struct inode of loaded journal $LogFile to check 470 * @rp: [OUT] on success this is a copy of the current restart page 471 * 472 * Check the $LogFile journal for consistency and return 'true' if it is 473 * consistent and 'false' if not. On success, the current restart page is 474 * returned in *@rp. Caller must call ntfs_free(*@rp) when finished with it. 475 * 476 * At present we only check the two restart pages and ignore the log record 477 * pages. 478 * 479 * Note that the MstProtected flag is not set on the $LogFile inode and hence 480 * when reading pages they are not deprotected. This is because we do not know 481 * if the $LogFile was created on a system with a different page size to ours 482 * yet and mst deprotection would fail if our page size is smaller. 483 */ 484 bool ntfs_check_logfile(struct inode *log_vi, RESTART_PAGE_HEADER **rp) 485 { 486 s64 size, pos; 487 LSN rstr1_lsn, rstr2_lsn; 488 ntfs_volume *vol = NTFS_SB(log_vi->i_sb); 489 struct address_space *mapping = log_vi->i_mapping; 490 struct page *page = NULL; 491 u8 *kaddr = NULL; 492 RESTART_PAGE_HEADER *rstr1_ph = NULL; 493 RESTART_PAGE_HEADER *rstr2_ph = NULL; 494 int log_page_size, log_page_mask, err; 495 bool logfile_is_empty = true; 496 u8 log_page_bits; 497 498 ntfs_debug("Entering."); 499 /* An empty $LogFile must have been clean before it got emptied. */ 500 if (NVolLogFileEmpty(vol)) 501 goto is_empty; 502 size = i_size_read(log_vi); 503 /* Make sure the file doesn't exceed the maximum allowed size. */ 504 if (size > MaxLogFileSize) 505 size = MaxLogFileSize; 506 /* 507 * Truncate size to a multiple of the page cache size or the default 508 * log page size if the page cache size is between the default log page 509 * log page size if the page cache size is between the default log page 510 * size and twice that. 511 */ 512 if (PAGE_CACHE_SIZE >= DefaultLogPageSize && PAGE_CACHE_SIZE <= 513 DefaultLogPageSize * 2) 514 log_page_size = DefaultLogPageSize; 515 else 516 log_page_size = PAGE_CACHE_SIZE; 517 log_page_mask = log_page_size - 1; 518 /* 519 * Use ntfs_ffs() instead of ffs() to enable the compiler to 520 * optimize log_page_size and log_page_bits into constants. 521 */ 522 log_page_bits = ntfs_ffs(log_page_size) - 1; 523 size &= ~(s64)(log_page_size - 1); 524 /* 525 * Ensure the log file is big enough to store at least the two restart 526 * pages and the minimum number of log record pages. 527 */ 528 if (size < log_page_size * 2 || (size - log_page_size * 2) >> 529 log_page_bits < MinLogRecordPages) { 530 ntfs_error(vol->sb, "$LogFile is too small."); 531 return false; 532 } 533 /* 534 * Read through the file looking for a restart page. Since the restart 535 * page header is at the beginning of a page we only need to search at 536 * what could be the beginning of a page (for each page size) rather 537 * than scanning the whole file byte by byte. If all potential places 538 * contain empty and uninitialzed records, the log file can be assumed 539 * to be empty. 540 */ 541 for (pos = 0; pos < size; pos <<= 1) { 542 pgoff_t idx = pos >> PAGE_CACHE_SHIFT; 543 if (!page || page->index != idx) { 544 if (page) 545 ntfs_unmap_page(page); 546 page = ntfs_map_page(mapping, idx); 547 if (IS_ERR(page)) { 548 ntfs_error(vol->sb, "Error mapping $LogFile " 549 "page (index %lu).", idx); 550 goto err_out; 551 } 552 } 553 kaddr = (u8*)page_address(page) + (pos & ~PAGE_CACHE_MASK); 554 /* 555 * A non-empty block means the logfile is not empty while an 556 * empty block after a non-empty block has been encountered 557 * means we are done. 558 */ 559 if (!ntfs_is_empty_recordp((le32*)kaddr)) 560 logfile_is_empty = false; 561 else if (!logfile_is_empty) 562 break; 563 /* 564 * A log record page means there cannot be a restart page after 565 * this so no need to continue searching. 566 */ 567 if (ntfs_is_rcrd_recordp((le32*)kaddr)) 568 break; 569 /* If not a (modified by chkdsk) restart page, continue. */ 570 if (!ntfs_is_rstr_recordp((le32*)kaddr) && 571 !ntfs_is_chkd_recordp((le32*)kaddr)) { 572 if (!pos) 573 pos = NTFS_BLOCK_SIZE >> 1; 574 continue; 575 } 576 /* 577 * Check the (modified by chkdsk) restart page for consistency 578 * and get a copy of the complete multi sector transfer 579 * deprotected restart page. 580 */ 581 err = ntfs_check_and_load_restart_page(log_vi, 582 (RESTART_PAGE_HEADER*)kaddr, pos, 583 !rstr1_ph ? &rstr1_ph : &rstr2_ph, 584 !rstr1_ph ? &rstr1_lsn : &rstr2_lsn); 585 if (!err) { 586 /* 587 * If we have now found the first (modified by chkdsk) 588 * restart page, continue looking for the second one. 589 */ 590 if (!pos) { 591 pos = NTFS_BLOCK_SIZE >> 1; 592 continue; 593 } 594 /* 595 * We have now found the second (modified by chkdsk) 596 * restart page, so we can stop looking. 597 */ 598 break; 599 } 600 /* 601 * Error output already done inside the function. Note, we do 602 * not abort if the restart page was invalid as we might still 603 * find a valid one further in the file. 604 */ 605 if (err != -EINVAL) { 606 ntfs_unmap_page(page); 607 goto err_out; 608 } 609 /* Continue looking. */ 610 if (!pos) 611 pos = NTFS_BLOCK_SIZE >> 1; 612 } 613 if (page) 614 ntfs_unmap_page(page); 615 if (logfile_is_empty) { 616 NVolSetLogFileEmpty(vol); 617 is_empty: 618 ntfs_debug("Done. ($LogFile is empty.)"); 619 return true; 620 } 621 if (!rstr1_ph) { 622 BUG_ON(rstr2_ph); 623 ntfs_error(vol->sb, "Did not find any restart pages in " 624 "$LogFile and it was not empty."); 625 return false; 626 } 627 /* If both restart pages were found, use the more recent one. */ 628 if (rstr2_ph) { 629 /* 630 * If the second restart area is more recent, switch to it. 631 * Otherwise just throw it away. 632 */ 633 if (rstr2_lsn > rstr1_lsn) { 634 ntfs_debug("Using second restart page as it is more " 635 "recent."); 636 ntfs_free(rstr1_ph); 637 rstr1_ph = rstr2_ph; 638 /* rstr1_lsn = rstr2_lsn; */ 639 } else { 640 ntfs_debug("Using first restart page as it is more " 641 "recent."); 642 ntfs_free(rstr2_ph); 643 } 644 rstr2_ph = NULL; 645 } 646 /* All consistency checks passed. */ 647 if (rp) 648 *rp = rstr1_ph; 649 else 650 ntfs_free(rstr1_ph); 651 ntfs_debug("Done."); 652 return true; 653 err_out: 654 if (rstr1_ph) 655 ntfs_free(rstr1_ph); 656 return false; 657 } 658 659 /** 660 * ntfs_is_logfile_clean - check in the journal if the volume is clean 661 * @log_vi: struct inode of loaded journal $LogFile to check 662 * @rp: copy of the current restart page 663 * 664 * Analyze the $LogFile journal and return 'true' if it indicates the volume was 665 * shutdown cleanly and 'false' if not. 666 * 667 * At present we only look at the two restart pages and ignore the log record 668 * pages. This is a little bit crude in that there will be a very small number 669 * of cases where we think that a volume is dirty when in fact it is clean. 670 * This should only affect volumes that have not been shutdown cleanly but did 671 * not have any pending, non-check-pointed i/o, i.e. they were completely idle 672 * at least for the five seconds preceding the unclean shutdown. 673 * 674 * This function assumes that the $LogFile journal has already been consistency 675 * checked by a call to ntfs_check_logfile() and in particular if the $LogFile 676 * is empty this function requires that NVolLogFileEmpty() is true otherwise an 677 * empty volume will be reported as dirty. 678 */ 679 bool ntfs_is_logfile_clean(struct inode *log_vi, const RESTART_PAGE_HEADER *rp) 680 { 681 ntfs_volume *vol = NTFS_SB(log_vi->i_sb); 682 RESTART_AREA *ra; 683 684 ntfs_debug("Entering."); 685 /* An empty $LogFile must have been clean before it got emptied. */ 686 if (NVolLogFileEmpty(vol)) { 687 ntfs_debug("Done. ($LogFile is empty.)"); 688 return true; 689 } 690 BUG_ON(!rp); 691 if (!ntfs_is_rstr_record(rp->magic) && 692 !ntfs_is_chkd_record(rp->magic)) { 693 ntfs_error(vol->sb, "Restart page buffer is invalid. This is " 694 "probably a bug in that the $LogFile should " 695 "have been consistency checked before calling " 696 "this function."); 697 return false; 698 } 699 ra = (RESTART_AREA*)((u8*)rp + le16_to_cpu(rp->restart_area_offset)); 700 /* 701 * If the $LogFile has active clients, i.e. it is open, and we do not 702 * have the RESTART_VOLUME_IS_CLEAN bit set in the restart area flags, 703 * we assume there was an unclean shutdown. 704 */ 705 if (ra->client_in_use_list != LOGFILE_NO_CLIENT && 706 !(ra->flags & RESTART_VOLUME_IS_CLEAN)) { 707 ntfs_debug("Done. $LogFile indicates a dirty shutdown."); 708 return false; 709 } 710 /* $LogFile indicates a clean shutdown. */ 711 ntfs_debug("Done. $LogFile indicates a clean shutdown."); 712 return true; 713 } 714 715 /** 716 * ntfs_empty_logfile - empty the contents of the $LogFile journal 717 * @log_vi: struct inode of loaded journal $LogFile to empty 718 * 719 * Empty the contents of the $LogFile journal @log_vi and return 'true' on 720 * success and 'false' on error. 721 * 722 * This function assumes that the $LogFile journal has already been consistency 723 * checked by a call to ntfs_check_logfile() and that ntfs_is_logfile_clean() 724 * has been used to ensure that the $LogFile is clean. 725 */ 726 bool ntfs_empty_logfile(struct inode *log_vi) 727 { 728 VCN vcn, end_vcn; 729 ntfs_inode *log_ni = NTFS_I(log_vi); 730 ntfs_volume *vol = log_ni->vol; 731 struct super_block *sb = vol->sb; 732 runlist_element *rl; 733 unsigned long flags; 734 unsigned block_size, block_size_bits; 735 int err; 736 bool should_wait = true; 737 738 ntfs_debug("Entering."); 739 if (NVolLogFileEmpty(vol)) { 740 ntfs_debug("Done."); 741 return true; 742 } 743 /* 744 * We cannot use ntfs_attr_set() because we may be still in the middle 745 * of a mount operation. Thus we do the emptying by hand by first 746 * zapping the page cache pages for the $LogFile/$DATA attribute and 747 * then emptying each of the buffers in each of the clusters specified 748 * by the runlist by hand. 749 */ 750 block_size = sb->s_blocksize; 751 block_size_bits = sb->s_blocksize_bits; 752 vcn = 0; 753 read_lock_irqsave(&log_ni->size_lock, flags); 754 end_vcn = (log_ni->initialized_size + vol->cluster_size_mask) >> 755 vol->cluster_size_bits; 756 read_unlock_irqrestore(&log_ni->size_lock, flags); 757 truncate_inode_pages(log_vi->i_mapping, 0); 758 down_write(&log_ni->runlist.lock); 759 rl = log_ni->runlist.rl; 760 if (unlikely(!rl || vcn < rl->vcn || !rl->length)) { 761 map_vcn: 762 err = ntfs_map_runlist_nolock(log_ni, vcn, NULL); 763 if (err) { 764 ntfs_error(sb, "Failed to map runlist fragment (error " 765 "%d).", -err); 766 goto err; 767 } 768 rl = log_ni->runlist.rl; 769 BUG_ON(!rl || vcn < rl->vcn || !rl->length); 770 } 771 /* Seek to the runlist element containing @vcn. */ 772 while (rl->length && vcn >= rl[1].vcn) 773 rl++; 774 do { 775 LCN lcn; 776 sector_t block, end_block; 777 s64 len; 778 779 /* 780 * If this run is not mapped map it now and start again as the 781 * runlist will have been updated. 782 */ 783 lcn = rl->lcn; 784 if (unlikely(lcn == LCN_RL_NOT_MAPPED)) { 785 vcn = rl->vcn; 786 goto map_vcn; 787 } 788 /* If this run is not valid abort with an error. */ 789 if (unlikely(!rl->length || lcn < LCN_HOLE)) 790 goto rl_err; 791 /* Skip holes. */ 792 if (lcn == LCN_HOLE) 793 continue; 794 block = lcn << vol->cluster_size_bits >> block_size_bits; 795 len = rl->length; 796 if (rl[1].vcn > end_vcn) 797 len = end_vcn - rl->vcn; 798 end_block = (lcn + len) << vol->cluster_size_bits >> 799 block_size_bits; 800 /* Iterate over the blocks in the run and empty them. */ 801 do { 802 struct buffer_head *bh; 803 804 /* Obtain the buffer, possibly not uptodate. */ 805 bh = sb_getblk(sb, block); 806 BUG_ON(!bh); 807 /* Setup buffer i/o submission. */ 808 lock_buffer(bh); 809 bh->b_end_io = end_buffer_write_sync; 810 get_bh(bh); 811 /* Set the entire contents of the buffer to 0xff. */ 812 memset(bh->b_data, -1, block_size); 813 if (!buffer_uptodate(bh)) 814 set_buffer_uptodate(bh); 815 if (buffer_dirty(bh)) 816 clear_buffer_dirty(bh); 817 /* 818 * Submit the buffer and wait for i/o to complete but 819 * only for the first buffer so we do not miss really 820 * serious i/o errors. Once the first buffer has 821 * completed ignore errors afterwards as we can assume 822 * that if one buffer worked all of them will work. 823 */ 824 submit_bh(WRITE, bh); 825 if (should_wait) { 826 should_wait = false; 827 wait_on_buffer(bh); 828 if (unlikely(!buffer_uptodate(bh))) 829 goto io_err; 830 } 831 brelse(bh); 832 } while (++block < end_block); 833 } while ((++rl)->vcn < end_vcn); 834 up_write(&log_ni->runlist.lock); 835 /* 836 * Zap the pages again just in case any got instantiated whilst we were 837 * emptying the blocks by hand. FIXME: We may not have completed 838 * writing to all the buffer heads yet so this may happen too early. 839 * We really should use a kernel thread to do the emptying 840 * asynchronously and then we can also set the volume dirty and output 841 * an error message if emptying should fail. 842 */ 843 truncate_inode_pages(log_vi->i_mapping, 0); 844 /* Set the flag so we do not have to do it again on remount. */ 845 NVolSetLogFileEmpty(vol); 846 ntfs_debug("Done."); 847 return true; 848 io_err: 849 ntfs_error(sb, "Failed to write buffer. Unmount and run chkdsk."); 850 goto dirty_err; 851 rl_err: 852 ntfs_error(sb, "Runlist is corrupt. Unmount and run chkdsk."); 853 dirty_err: 854 NVolSetErrors(vol); 855 err = -EIO; 856 err: 857 up_write(&log_ni->runlist.lock); 858 ntfs_error(sb, "Failed to fill $LogFile with 0xff bytes (error %d).", 859 -err); 860 return false; 861 } 862 863 #endif /* NTFS_RW */
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