1 /* 2 * super.c - NTFS kernel super block handling. Part of the Linux-NTFS project. 3 * 4 * Copyright (c) 2001-2007 Anton Altaparmakov 5 * Copyright (c) 2001,2002 Richard Russon 6 * 7 * This program/include file is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License as published 9 * by the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program/include file is distributed in the hope that it will be 13 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty 14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program (in the main directory of the Linux-NTFS 19 * distribution in the file COPYING); if not, write to the Free Software 20 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 */ 22 23 #include <linux/stddef.h> 24 #include <linux/init.h> 25 #include <linux/slab.h> 26 #include <linux/string.h> 27 #include <linux/spinlock.h> 28 #include <linux/blkdev.h> /* For bdev_logical_block_size(). */ 29 #include <linux/backing-dev.h> 30 #include <linux/buffer_head.h> 31 #include <linux/vfs.h> 32 #include <linux/moduleparam.h> 33 #include <linux/smp_lock.h> 34 #include <linux/bitmap.h> 35 36 #include "sysctl.h" 37 #include "logfile.h" 38 #include "quota.h" 39 #include "usnjrnl.h" 40 #include "dir.h" 41 #include "debug.h" 42 #include "index.h" 43 #include "inode.h" 44 #include "aops.h" 45 #include "layout.h" 46 #include "malloc.h" 47 #include "ntfs.h" 48 49 /* Number of mounted filesystems which have compression enabled. */ 50 static unsigned long ntfs_nr_compression_users; 51 52 /* A global default upcase table and a corresponding reference count. */ 53 static ntfschar *default_upcase = NULL; 54 static unsigned long ntfs_nr_upcase_users = 0; 55 56 /* Error constants/strings used in inode.c::ntfs_show_options(). */ 57 typedef enum { 58 /* One of these must be present, default is ON_ERRORS_CONTINUE. */ 59 ON_ERRORS_PANIC = 0x01, 60 ON_ERRORS_REMOUNT_RO = 0x02, 61 ON_ERRORS_CONTINUE = 0x04, 62 /* Optional, can be combined with any of the above. */ 63 ON_ERRORS_RECOVER = 0x10, 64 } ON_ERRORS_ACTIONS; 65 66 const option_t on_errors_arr[] = { 67 { ON_ERRORS_PANIC, "panic" }, 68 { ON_ERRORS_REMOUNT_RO, "remount-ro", }, 69 { ON_ERRORS_CONTINUE, "continue", }, 70 { ON_ERRORS_RECOVER, "recover" }, 71 { 0, NULL } 72 }; 73 74 /** 75 * simple_getbool - 76 * 77 * Copied from old ntfs driver (which copied from vfat driver). 78 */ 79 static int simple_getbool(char *s, bool *setval) 80 { 81 if (s) { 82 if (!strcmp(s, "1") || !strcmp(s, "yes") || !strcmp(s, "true")) 83 *setval = true; 84 else if (!strcmp(s, "0") || !strcmp(s, "no") || 85 !strcmp(s, "false")) 86 *setval = false; 87 else 88 return 0; 89 } else 90 *setval = true; 91 return 1; 92 } 93 94 /** 95 * parse_options - parse the (re)mount options 96 * @vol: ntfs volume 97 * @opt: string containing the (re)mount options 98 * 99 * Parse the recognized options in @opt for the ntfs volume described by @vol. 100 */ 101 static bool parse_options(ntfs_volume *vol, char *opt) 102 { 103 char *p, *v, *ov; 104 static char *utf8 = "utf8"; 105 int errors = 0, sloppy = 0; 106 uid_t uid = (uid_t)-1; 107 gid_t gid = (gid_t)-1; 108 mode_t fmask = (mode_t)-1, dmask = (mode_t)-1; 109 int mft_zone_multiplier = -1, on_errors = -1; 110 int show_sys_files = -1, case_sensitive = -1, disable_sparse = -1; 111 struct nls_table *nls_map = NULL, *old_nls; 112 113 /* I am lazy... (-8 */ 114 #define NTFS_GETOPT_WITH_DEFAULT(option, variable, default_value) \ 115 if (!strcmp(p, option)) { \ 116 if (!v || !*v) \ 117 variable = default_value; \ 118 else { \ 119 variable = simple_strtoul(ov = v, &v, 0); \ 120 if (*v) \ 121 goto needs_val; \ 122 } \ 123 } 124 #define NTFS_GETOPT(option, variable) \ 125 if (!strcmp(p, option)) { \ 126 if (!v || !*v) \ 127 goto needs_arg; \ 128 variable = simple_strtoul(ov = v, &v, 0); \ 129 if (*v) \ 130 goto needs_val; \ 131 } 132 #define NTFS_GETOPT_OCTAL(option, variable) \ 133 if (!strcmp(p, option)) { \ 134 if (!v || !*v) \ 135 goto needs_arg; \ 136 variable = simple_strtoul(ov = v, &v, 8); \ 137 if (*v) \ 138 goto needs_val; \ 139 } 140 #define NTFS_GETOPT_BOOL(option, variable) \ 141 if (!strcmp(p, option)) { \ 142 bool val; \ 143 if (!simple_getbool(v, &val)) \ 144 goto needs_bool; \ 145 variable = val; \ 146 } 147 #define NTFS_GETOPT_OPTIONS_ARRAY(option, variable, opt_array) \ 148 if (!strcmp(p, option)) { \ 149 int _i; \ 150 if (!v || !*v) \ 151 goto needs_arg; \ 152 ov = v; \ 153 if (variable == -1) \ 154 variable = 0; \ 155 for (_i = 0; opt_array[_i].str && *opt_array[_i].str; _i++) \ 156 if (!strcmp(opt_array[_i].str, v)) { \ 157 variable |= opt_array[_i].val; \ 158 break; \ 159 } \ 160 if (!opt_array[_i].str || !*opt_array[_i].str) \ 161 goto needs_val; \ 162 } 163 if (!opt || !*opt) 164 goto no_mount_options; 165 ntfs_debug("Entering with mount options string: %s", opt); 166 while ((p = strsep(&opt, ","))) { 167 if ((v = strchr(p, '='))) 168 *v++ = 0; 169 NTFS_GETOPT("uid", uid) 170 else NTFS_GETOPT("gid", gid) 171 else NTFS_GETOPT_OCTAL("umask", fmask = dmask) 172 else NTFS_GETOPT_OCTAL("fmask", fmask) 173 else NTFS_GETOPT_OCTAL("dmask", dmask) 174 else NTFS_GETOPT("mft_zone_multiplier", mft_zone_multiplier) 175 else NTFS_GETOPT_WITH_DEFAULT("sloppy", sloppy, true) 176 else NTFS_GETOPT_BOOL("show_sys_files", show_sys_files) 177 else NTFS_GETOPT_BOOL("case_sensitive", case_sensitive) 178 else NTFS_GETOPT_BOOL("disable_sparse", disable_sparse) 179 else NTFS_GETOPT_OPTIONS_ARRAY("errors", on_errors, 180 on_errors_arr) 181 else if (!strcmp(p, "posix") || !strcmp(p, "show_inodes")) 182 ntfs_warning(vol->sb, "Ignoring obsolete option %s.", 183 p); 184 else if (!strcmp(p, "nls") || !strcmp(p, "iocharset")) { 185 if (!strcmp(p, "iocharset")) 186 ntfs_warning(vol->sb, "Option iocharset is " 187 "deprecated. Please use " 188 "option nls=<charsetname> in " 189 "the future."); 190 if (!v || !*v) 191 goto needs_arg; 192 use_utf8: 193 old_nls = nls_map; 194 nls_map = load_nls(v); 195 if (!nls_map) { 196 if (!old_nls) { 197 ntfs_error(vol->sb, "NLS character set " 198 "%s not found.", v); 199 return false; 200 } 201 ntfs_error(vol->sb, "NLS character set %s not " 202 "found. Using previous one %s.", 203 v, old_nls->charset); 204 nls_map = old_nls; 205 } else /* nls_map */ { 206 unload_nls(old_nls); 207 } 208 } else if (!strcmp(p, "utf8")) { 209 bool val = false; 210 ntfs_warning(vol->sb, "Option utf8 is no longer " 211 "supported, using option nls=utf8. Please " 212 "use option nls=utf8 in the future and " 213 "make sure utf8 is compiled either as a " 214 "module or into the kernel."); 215 if (!v || !*v) 216 val = true; 217 else if (!simple_getbool(v, &val)) 218 goto needs_bool; 219 if (val) { 220 v = utf8; 221 goto use_utf8; 222 } 223 } else { 224 ntfs_error(vol->sb, "Unrecognized mount option %s.", p); 225 if (errors < INT_MAX) 226 errors++; 227 } 228 #undef NTFS_GETOPT_OPTIONS_ARRAY 229 #undef NTFS_GETOPT_BOOL 230 #undef NTFS_GETOPT 231 #undef NTFS_GETOPT_WITH_DEFAULT 232 } 233 no_mount_options: 234 if (errors && !sloppy) 235 return false; 236 if (sloppy) 237 ntfs_warning(vol->sb, "Sloppy option given. Ignoring " 238 "unrecognized mount option(s) and continuing."); 239 /* Keep this first! */ 240 if (on_errors != -1) { 241 if (!on_errors) { 242 ntfs_error(vol->sb, "Invalid errors option argument " 243 "or bug in options parser."); 244 return false; 245 } 246 } 247 if (nls_map) { 248 if (vol->nls_map && vol->nls_map != nls_map) { 249 ntfs_error(vol->sb, "Cannot change NLS character set " 250 "on remount."); 251 return false; 252 } /* else (!vol->nls_map) */ 253 ntfs_debug("Using NLS character set %s.", nls_map->charset); 254 vol->nls_map = nls_map; 255 } else /* (!nls_map) */ { 256 if (!vol->nls_map) { 257 vol->nls_map = load_nls_default(); 258 if (!vol->nls_map) { 259 ntfs_error(vol->sb, "Failed to load default " 260 "NLS character set."); 261 return false; 262 } 263 ntfs_debug("Using default NLS character set (%s).", 264 vol->nls_map->charset); 265 } 266 } 267 if (mft_zone_multiplier != -1) { 268 if (vol->mft_zone_multiplier && vol->mft_zone_multiplier != 269 mft_zone_multiplier) { 270 ntfs_error(vol->sb, "Cannot change mft_zone_multiplier " 271 "on remount."); 272 return false; 273 } 274 if (mft_zone_multiplier < 1 || mft_zone_multiplier > 4) { 275 ntfs_error(vol->sb, "Invalid mft_zone_multiplier. " 276 "Using default value, i.e. 1."); 277 mft_zone_multiplier = 1; 278 } 279 vol->mft_zone_multiplier = mft_zone_multiplier; 280 } 281 if (!vol->mft_zone_multiplier) 282 vol->mft_zone_multiplier = 1; 283 if (on_errors != -1) 284 vol->on_errors = on_errors; 285 if (!vol->on_errors || vol->on_errors == ON_ERRORS_RECOVER) 286 vol->on_errors |= ON_ERRORS_CONTINUE; 287 if (uid != (uid_t)-1) 288 vol->uid = uid; 289 if (gid != (gid_t)-1) 290 vol->gid = gid; 291 if (fmask != (mode_t)-1) 292 vol->fmask = fmask; 293 if (dmask != (mode_t)-1) 294 vol->dmask = dmask; 295 if (show_sys_files != -1) { 296 if (show_sys_files) 297 NVolSetShowSystemFiles(vol); 298 else 299 NVolClearShowSystemFiles(vol); 300 } 301 if (case_sensitive != -1) { 302 if (case_sensitive) 303 NVolSetCaseSensitive(vol); 304 else 305 NVolClearCaseSensitive(vol); 306 } 307 if (disable_sparse != -1) { 308 if (disable_sparse) 309 NVolClearSparseEnabled(vol); 310 else { 311 if (!NVolSparseEnabled(vol) && 312 vol->major_ver && vol->major_ver < 3) 313 ntfs_warning(vol->sb, "Not enabling sparse " 314 "support due to NTFS volume " 315 "version %i.%i (need at least " 316 "version 3.0).", vol->major_ver, 317 vol->minor_ver); 318 else 319 NVolSetSparseEnabled(vol); 320 } 321 } 322 return true; 323 needs_arg: 324 ntfs_error(vol->sb, "The %s option requires an argument.", p); 325 return false; 326 needs_bool: 327 ntfs_error(vol->sb, "The %s option requires a boolean argument.", p); 328 return false; 329 needs_val: 330 ntfs_error(vol->sb, "Invalid %s option argument: %s", p, ov); 331 return false; 332 } 333 334 #ifdef NTFS_RW 335 336 /** 337 * ntfs_write_volume_flags - write new flags to the volume information flags 338 * @vol: ntfs volume on which to modify the flags 339 * @flags: new flags value for the volume information flags 340 * 341 * Internal function. You probably want to use ntfs_{set,clear}_volume_flags() 342 * instead (see below). 343 * 344 * Replace the volume information flags on the volume @vol with the value 345 * supplied in @flags. Note, this overwrites the volume information flags, so 346 * make sure to combine the flags you want to modify with the old flags and use 347 * the result when calling ntfs_write_volume_flags(). 348 * 349 * Return 0 on success and -errno on error. 350 */ 351 static int ntfs_write_volume_flags(ntfs_volume *vol, const VOLUME_FLAGS flags) 352 { 353 ntfs_inode *ni = NTFS_I(vol->vol_ino); 354 MFT_RECORD *m; 355 VOLUME_INFORMATION *vi; 356 ntfs_attr_search_ctx *ctx; 357 int err; 358 359 ntfs_debug("Entering, old flags = 0x%x, new flags = 0x%x.", 360 le16_to_cpu(vol->vol_flags), le16_to_cpu(flags)); 361 if (vol->vol_flags == flags) 362 goto done; 363 BUG_ON(!ni); 364 m = map_mft_record(ni); 365 if (IS_ERR(m)) { 366 err = PTR_ERR(m); 367 goto err_out; 368 } 369 ctx = ntfs_attr_get_search_ctx(ni, m); 370 if (!ctx) { 371 err = -ENOMEM; 372 goto put_unm_err_out; 373 } 374 err = ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0, 375 ctx); 376 if (err) 377 goto put_unm_err_out; 378 vi = (VOLUME_INFORMATION*)((u8*)ctx->attr + 379 le16_to_cpu(ctx->attr->data.resident.value_offset)); 380 vol->vol_flags = vi->flags = flags; 381 flush_dcache_mft_record_page(ctx->ntfs_ino); 382 mark_mft_record_dirty(ctx->ntfs_ino); 383 ntfs_attr_put_search_ctx(ctx); 384 unmap_mft_record(ni); 385 done: 386 ntfs_debug("Done."); 387 return 0; 388 put_unm_err_out: 389 if (ctx) 390 ntfs_attr_put_search_ctx(ctx); 391 unmap_mft_record(ni); 392 err_out: 393 ntfs_error(vol->sb, "Failed with error code %i.", -err); 394 return err; 395 } 396 397 /** 398 * ntfs_set_volume_flags - set bits in the volume information flags 399 * @vol: ntfs volume on which to modify the flags 400 * @flags: flags to set on the volume 401 * 402 * Set the bits in @flags in the volume information flags on the volume @vol. 403 * 404 * Return 0 on success and -errno on error. 405 */ 406 static inline int ntfs_set_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags) 407 { 408 flags &= VOLUME_FLAGS_MASK; 409 return ntfs_write_volume_flags(vol, vol->vol_flags | flags); 410 } 411 412 /** 413 * ntfs_clear_volume_flags - clear bits in the volume information flags 414 * @vol: ntfs volume on which to modify the flags 415 * @flags: flags to clear on the volume 416 * 417 * Clear the bits in @flags in the volume information flags on the volume @vol. 418 * 419 * Return 0 on success and -errno on error. 420 */ 421 static inline int ntfs_clear_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags) 422 { 423 flags &= VOLUME_FLAGS_MASK; 424 flags = vol->vol_flags & cpu_to_le16(~le16_to_cpu(flags)); 425 return ntfs_write_volume_flags(vol, flags); 426 } 427 428 #endif /* NTFS_RW */ 429 430 /** 431 * ntfs_remount - change the mount options of a mounted ntfs filesystem 432 * @sb: superblock of mounted ntfs filesystem 433 * @flags: remount flags 434 * @opt: remount options string 435 * 436 * Change the mount options of an already mounted ntfs filesystem. 437 * 438 * NOTE: The VFS sets the @sb->s_flags remount flags to @flags after 439 * ntfs_remount() returns successfully (i.e. returns 0). Otherwise, 440 * @sb->s_flags are not changed. 441 */ 442 static int ntfs_remount(struct super_block *sb, int *flags, char *opt) 443 { 444 ntfs_volume *vol = NTFS_SB(sb); 445 446 ntfs_debug("Entering with remount options string: %s", opt); 447 448 lock_kernel(); 449 #ifndef NTFS_RW 450 /* For read-only compiled driver, enforce read-only flag. */ 451 *flags |= MS_RDONLY; 452 #else /* NTFS_RW */ 453 /* 454 * For the read-write compiled driver, if we are remounting read-write, 455 * make sure there are no volume errors and that no unsupported volume 456 * flags are set. Also, empty the logfile journal as it would become 457 * stale as soon as something is written to the volume and mark the 458 * volume dirty so that chkdsk is run if the volume is not umounted 459 * cleanly. Finally, mark the quotas out of date so Windows rescans 460 * the volume on boot and updates them. 461 * 462 * When remounting read-only, mark the volume clean if no volume errors 463 * have occured. 464 */ 465 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 466 static const char *es = ". Cannot remount read-write."; 467 468 /* Remounting read-write. */ 469 if (NVolErrors(vol)) { 470 ntfs_error(sb, "Volume has errors and is read-only%s", 471 es); 472 unlock_kernel(); 473 return -EROFS; 474 } 475 if (vol->vol_flags & VOLUME_IS_DIRTY) { 476 ntfs_error(sb, "Volume is dirty and read-only%s", es); 477 unlock_kernel(); 478 return -EROFS; 479 } 480 if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) { 481 ntfs_error(sb, "Volume has been modified by chkdsk " 482 "and is read-only%s", es); 483 unlock_kernel(); 484 return -EROFS; 485 } 486 if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { 487 ntfs_error(sb, "Volume has unsupported flags set " 488 "(0x%x) and is read-only%s", 489 (unsigned)le16_to_cpu(vol->vol_flags), 490 es); 491 unlock_kernel(); 492 return -EROFS; 493 } 494 if (ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) { 495 ntfs_error(sb, "Failed to set dirty bit in volume " 496 "information flags%s", es); 497 unlock_kernel(); 498 return -EROFS; 499 } 500 #if 0 501 // TODO: Enable this code once we start modifying anything that 502 // is different between NTFS 1.2 and 3.x... 503 /* Set NT4 compatibility flag on newer NTFS version volumes. */ 504 if ((vol->major_ver > 1)) { 505 if (ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) { 506 ntfs_error(sb, "Failed to set NT4 " 507 "compatibility flag%s", es); 508 NVolSetErrors(vol); 509 return -EROFS; 510 } 511 } 512 #endif 513 if (!ntfs_empty_logfile(vol->logfile_ino)) { 514 ntfs_error(sb, "Failed to empty journal $LogFile%s", 515 es); 516 NVolSetErrors(vol); 517 unlock_kernel(); 518 return -EROFS; 519 } 520 if (!ntfs_mark_quotas_out_of_date(vol)) { 521 ntfs_error(sb, "Failed to mark quotas out of date%s", 522 es); 523 NVolSetErrors(vol); 524 unlock_kernel(); 525 return -EROFS; 526 } 527 if (!ntfs_stamp_usnjrnl(vol)) { 528 ntfs_error(sb, "Failed to stamp transation log " 529 "($UsnJrnl)%s", es); 530 NVolSetErrors(vol); 531 unlock_kernel(); 532 return -EROFS; 533 } 534 } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) { 535 /* Remounting read-only. */ 536 if (!NVolErrors(vol)) { 537 if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY)) 538 ntfs_warning(sb, "Failed to clear dirty bit " 539 "in volume information " 540 "flags. Run chkdsk."); 541 } 542 } 543 #endif /* NTFS_RW */ 544 545 // TODO: Deal with *flags. 546 547 if (!parse_options(vol, opt)) { 548 unlock_kernel(); 549 return -EINVAL; 550 } 551 unlock_kernel(); 552 ntfs_debug("Done."); 553 return 0; 554 } 555 556 /** 557 * is_boot_sector_ntfs - check whether a boot sector is a valid NTFS boot sector 558 * @sb: Super block of the device to which @b belongs. 559 * @b: Boot sector of device @sb to check. 560 * @silent: If 'true', all output will be silenced. 561 * 562 * is_boot_sector_ntfs() checks whether the boot sector @b is a valid NTFS boot 563 * sector. Returns 'true' if it is valid and 'false' if not. 564 * 565 * @sb is only needed for warning/error output, i.e. it can be NULL when silent 566 * is 'true'. 567 */ 568 static bool is_boot_sector_ntfs(const struct super_block *sb, 569 const NTFS_BOOT_SECTOR *b, const bool silent) 570 { 571 /* 572 * Check that checksum == sum of u32 values from b to the checksum 573 * field. If checksum is zero, no checking is done. We will work when 574 * the checksum test fails, since some utilities update the boot sector 575 * ignoring the checksum which leaves the checksum out-of-date. We 576 * report a warning if this is the case. 577 */ 578 if ((void*)b < (void*)&b->checksum && b->checksum && !silent) { 579 le32 *u; 580 u32 i; 581 582 for (i = 0, u = (le32*)b; u < (le32*)(&b->checksum); ++u) 583 i += le32_to_cpup(u); 584 if (le32_to_cpu(b->checksum) != i) 585 ntfs_warning(sb, "Invalid boot sector checksum."); 586 } 587 /* Check OEMidentifier is "NTFS " */ 588 if (b->oem_id != magicNTFS) 589 goto not_ntfs; 590 /* Check bytes per sector value is between 256 and 4096. */ 591 if (le16_to_cpu(b->bpb.bytes_per_sector) < 0x100 || 592 le16_to_cpu(b->bpb.bytes_per_sector) > 0x1000) 593 goto not_ntfs; 594 /* Check sectors per cluster value is valid. */ 595 switch (b->bpb.sectors_per_cluster) { 596 case 1: case 2: case 4: case 8: case 16: case 32: case 64: case 128: 597 break; 598 default: 599 goto not_ntfs; 600 } 601 /* Check the cluster size is not above the maximum (64kiB). */ 602 if ((u32)le16_to_cpu(b->bpb.bytes_per_sector) * 603 b->bpb.sectors_per_cluster > NTFS_MAX_CLUSTER_SIZE) 604 goto not_ntfs; 605 /* Check reserved/unused fields are really zero. */ 606 if (le16_to_cpu(b->bpb.reserved_sectors) || 607 le16_to_cpu(b->bpb.root_entries) || 608 le16_to_cpu(b->bpb.sectors) || 609 le16_to_cpu(b->bpb.sectors_per_fat) || 610 le32_to_cpu(b->bpb.large_sectors) || b->bpb.fats) 611 goto not_ntfs; 612 /* Check clusters per file mft record value is valid. */ 613 if ((u8)b->clusters_per_mft_record < 0xe1 || 614 (u8)b->clusters_per_mft_record > 0xf7) 615 switch (b->clusters_per_mft_record) { 616 case 1: case 2: case 4: case 8: case 16: case 32: case 64: 617 break; 618 default: 619 goto not_ntfs; 620 } 621 /* Check clusters per index block value is valid. */ 622 if ((u8)b->clusters_per_index_record < 0xe1 || 623 (u8)b->clusters_per_index_record > 0xf7) 624 switch (b->clusters_per_index_record) { 625 case 1: case 2: case 4: case 8: case 16: case 32: case 64: 626 break; 627 default: 628 goto not_ntfs; 629 } 630 /* 631 * Check for valid end of sector marker. We will work without it, but 632 * many BIOSes will refuse to boot from a bootsector if the magic is 633 * incorrect, so we emit a warning. 634 */ 635 if (!silent && b->end_of_sector_marker != cpu_to_le16(0xaa55)) 636 ntfs_warning(sb, "Invalid end of sector marker."); 637 return true; 638 not_ntfs: 639 return false; 640 } 641 642 /** 643 * read_ntfs_boot_sector - read the NTFS boot sector of a device 644 * @sb: super block of device to read the boot sector from 645 * @silent: if true, suppress all output 646 * 647 * Reads the boot sector from the device and validates it. If that fails, tries 648 * to read the backup boot sector, first from the end of the device a-la NT4 and 649 * later and then from the middle of the device a-la NT3.51 and before. 650 * 651 * If a valid boot sector is found but it is not the primary boot sector, we 652 * repair the primary boot sector silently (unless the device is read-only or 653 * the primary boot sector is not accessible). 654 * 655 * NOTE: To call this function, @sb must have the fields s_dev, the ntfs super 656 * block (u.ntfs_sb), nr_blocks and the device flags (s_flags) initialized 657 * to their respective values. 658 * 659 * Return the unlocked buffer head containing the boot sector or NULL on error. 660 */ 661 static struct buffer_head *read_ntfs_boot_sector(struct super_block *sb, 662 const int silent) 663 { 664 const char *read_err_str = "Unable to read %s boot sector."; 665 struct buffer_head *bh_primary, *bh_backup; 666 sector_t nr_blocks = NTFS_SB(sb)->nr_blocks; 667 668 /* Try to read primary boot sector. */ 669 if ((bh_primary = sb_bread(sb, 0))) { 670 if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) 671 bh_primary->b_data, silent)) 672 return bh_primary; 673 if (!silent) 674 ntfs_error(sb, "Primary boot sector is invalid."); 675 } else if (!silent) 676 ntfs_error(sb, read_err_str, "primary"); 677 if (!(NTFS_SB(sb)->on_errors & ON_ERRORS_RECOVER)) { 678 if (bh_primary) 679 brelse(bh_primary); 680 if (!silent) 681 ntfs_error(sb, "Mount option errors=recover not used. " 682 "Aborting without trying to recover."); 683 return NULL; 684 } 685 /* Try to read NT4+ backup boot sector. */ 686 if ((bh_backup = sb_bread(sb, nr_blocks - 1))) { 687 if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) 688 bh_backup->b_data, silent)) 689 goto hotfix_primary_boot_sector; 690 brelse(bh_backup); 691 } else if (!silent) 692 ntfs_error(sb, read_err_str, "backup"); 693 /* Try to read NT3.51- backup boot sector. */ 694 if ((bh_backup = sb_bread(sb, nr_blocks >> 1))) { 695 if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) 696 bh_backup->b_data, silent)) 697 goto hotfix_primary_boot_sector; 698 if (!silent) 699 ntfs_error(sb, "Could not find a valid backup boot " 700 "sector."); 701 brelse(bh_backup); 702 } else if (!silent) 703 ntfs_error(sb, read_err_str, "backup"); 704 /* We failed. Cleanup and return. */ 705 if (bh_primary) 706 brelse(bh_primary); 707 return NULL; 708 hotfix_primary_boot_sector: 709 if (bh_primary) { 710 /* 711 * If we managed to read sector zero and the volume is not 712 * read-only, copy the found, valid backup boot sector to the 713 * primary boot sector. Note we only copy the actual boot 714 * sector structure, not the actual whole device sector as that 715 * may be bigger and would potentially damage the $Boot system 716 * file (FIXME: Would be nice to know if the backup boot sector 717 * on a large sector device contains the whole boot loader or 718 * just the first 512 bytes). 719 */ 720 if (!(sb->s_flags & MS_RDONLY)) { 721 ntfs_warning(sb, "Hot-fix: Recovering invalid primary " 722 "boot sector from backup copy."); 723 memcpy(bh_primary->b_data, bh_backup->b_data, 724 NTFS_BLOCK_SIZE); 725 mark_buffer_dirty(bh_primary); 726 sync_dirty_buffer(bh_primary); 727 if (buffer_uptodate(bh_primary)) { 728 brelse(bh_backup); 729 return bh_primary; 730 } 731 ntfs_error(sb, "Hot-fix: Device write error while " 732 "recovering primary boot sector."); 733 } else { 734 ntfs_warning(sb, "Hot-fix: Recovery of primary boot " 735 "sector failed: Read-only mount."); 736 } 737 brelse(bh_primary); 738 } 739 ntfs_warning(sb, "Using backup boot sector."); 740 return bh_backup; 741 } 742 743 /** 744 * parse_ntfs_boot_sector - parse the boot sector and store the data in @vol 745 * @vol: volume structure to initialise with data from boot sector 746 * @b: boot sector to parse 747 * 748 * Parse the ntfs boot sector @b and store all imporant information therein in 749 * the ntfs super block @vol. Return 'true' on success and 'false' on error. 750 */ 751 static bool parse_ntfs_boot_sector(ntfs_volume *vol, const NTFS_BOOT_SECTOR *b) 752 { 753 unsigned int sectors_per_cluster_bits, nr_hidden_sects; 754 int clusters_per_mft_record, clusters_per_index_record; 755 s64 ll; 756 757 vol->sector_size = le16_to_cpu(b->bpb.bytes_per_sector); 758 vol->sector_size_bits = ffs(vol->sector_size) - 1; 759 ntfs_debug("vol->sector_size = %i (0x%x)", vol->sector_size, 760 vol->sector_size); 761 ntfs_debug("vol->sector_size_bits = %i (0x%x)", vol->sector_size_bits, 762 vol->sector_size_bits); 763 if (vol->sector_size < vol->sb->s_blocksize) { 764 ntfs_error(vol->sb, "Sector size (%i) is smaller than the " 765 "device block size (%lu). This is not " 766 "supported. Sorry.", vol->sector_size, 767 vol->sb->s_blocksize); 768 return false; 769 } 770 ntfs_debug("sectors_per_cluster = 0x%x", b->bpb.sectors_per_cluster); 771 sectors_per_cluster_bits = ffs(b->bpb.sectors_per_cluster) - 1; 772 ntfs_debug("sectors_per_cluster_bits = 0x%x", 773 sectors_per_cluster_bits); 774 nr_hidden_sects = le32_to_cpu(b->bpb.hidden_sectors); 775 ntfs_debug("number of hidden sectors = 0x%x", nr_hidden_sects); 776 vol->cluster_size = vol->sector_size << sectors_per_cluster_bits; 777 vol->cluster_size_mask = vol->cluster_size - 1; 778 vol->cluster_size_bits = ffs(vol->cluster_size) - 1; 779 ntfs_debug("vol->cluster_size = %i (0x%x)", vol->cluster_size, 780 vol->cluster_size); 781 ntfs_debug("vol->cluster_size_mask = 0x%x", vol->cluster_size_mask); 782 ntfs_debug("vol->cluster_size_bits = %i", vol->cluster_size_bits); 783 if (vol->cluster_size < vol->sector_size) { 784 ntfs_error(vol->sb, "Cluster size (%i) is smaller than the " 785 "sector size (%i). This is not supported. " 786 "Sorry.", vol->cluster_size, vol->sector_size); 787 return false; 788 } 789 clusters_per_mft_record = b->clusters_per_mft_record; 790 ntfs_debug("clusters_per_mft_record = %i (0x%x)", 791 clusters_per_mft_record, clusters_per_mft_record); 792 if (clusters_per_mft_record > 0) 793 vol->mft_record_size = vol->cluster_size << 794 (ffs(clusters_per_mft_record) - 1); 795 else 796 /* 797 * When mft_record_size < cluster_size, clusters_per_mft_record 798 * = -log2(mft_record_size) bytes. mft_record_size normaly is 799 * 1024 bytes, which is encoded as 0xF6 (-10 in decimal). 800 */ 801 vol->mft_record_size = 1 << -clusters_per_mft_record; 802 vol->mft_record_size_mask = vol->mft_record_size - 1; 803 vol->mft_record_size_bits = ffs(vol->mft_record_size) - 1; 804 ntfs_debug("vol->mft_record_size = %i (0x%x)", vol->mft_record_size, 805 vol->mft_record_size); 806 ntfs_debug("vol->mft_record_size_mask = 0x%x", 807 vol->mft_record_size_mask); 808 ntfs_debug("vol->mft_record_size_bits = %i (0x%x)", 809 vol->mft_record_size_bits, vol->mft_record_size_bits); 810 /* 811 * We cannot support mft record sizes above the PAGE_CACHE_SIZE since 812 * we store $MFT/$DATA, the table of mft records in the page cache. 813 */ 814 if (vol->mft_record_size > PAGE_CACHE_SIZE) { 815 ntfs_error(vol->sb, "Mft record size (%i) exceeds the " 816 "PAGE_CACHE_SIZE on your system (%lu). " 817 "This is not supported. Sorry.", 818 vol->mft_record_size, PAGE_CACHE_SIZE); 819 return false; 820 } 821 /* We cannot support mft record sizes below the sector size. */ 822 if (vol->mft_record_size < vol->sector_size) { 823 ntfs_error(vol->sb, "Mft record size (%i) is smaller than the " 824 "sector size (%i). This is not supported. " 825 "Sorry.", vol->mft_record_size, 826 vol->sector_size); 827 return false; 828 } 829 clusters_per_index_record = b->clusters_per_index_record; 830 ntfs_debug("clusters_per_index_record = %i (0x%x)", 831 clusters_per_index_record, clusters_per_index_record); 832 if (clusters_per_index_record > 0) 833 vol->index_record_size = vol->cluster_size << 834 (ffs(clusters_per_index_record) - 1); 835 else 836 /* 837 * When index_record_size < cluster_size, 838 * clusters_per_index_record = -log2(index_record_size) bytes. 839 * index_record_size normaly equals 4096 bytes, which is 840 * encoded as 0xF4 (-12 in decimal). 841 */ 842 vol->index_record_size = 1 << -clusters_per_index_record; 843 vol->index_record_size_mask = vol->index_record_size - 1; 844 vol->index_record_size_bits = ffs(vol->index_record_size) - 1; 845 ntfs_debug("vol->index_record_size = %i (0x%x)", 846 vol->index_record_size, vol->index_record_size); 847 ntfs_debug("vol->index_record_size_mask = 0x%x", 848 vol->index_record_size_mask); 849 ntfs_debug("vol->index_record_size_bits = %i (0x%x)", 850 vol->index_record_size_bits, 851 vol->index_record_size_bits); 852 /* We cannot support index record sizes below the sector size. */ 853 if (vol->index_record_size < vol->sector_size) { 854 ntfs_error(vol->sb, "Index record size (%i) is smaller than " 855 "the sector size (%i). This is not " 856 "supported. Sorry.", vol->index_record_size, 857 vol->sector_size); 858 return false; 859 } 860 /* 861 * Get the size of the volume in clusters and check for 64-bit-ness. 862 * Windows currently only uses 32 bits to save the clusters so we do 863 * the same as it is much faster on 32-bit CPUs. 864 */ 865 ll = sle64_to_cpu(b->number_of_sectors) >> sectors_per_cluster_bits; 866 if ((u64)ll >= 1ULL << 32) { 867 ntfs_error(vol->sb, "Cannot handle 64-bit clusters. Sorry."); 868 return false; 869 } 870 vol->nr_clusters = ll; 871 ntfs_debug("vol->nr_clusters = 0x%llx", (long long)vol->nr_clusters); 872 /* 873 * On an architecture where unsigned long is 32-bits, we restrict the 874 * volume size to 2TiB (2^41). On a 64-bit architecture, the compiler 875 * will hopefully optimize the whole check away. 876 */ 877 if (sizeof(unsigned long) < 8) { 878 if ((ll << vol->cluster_size_bits) >= (1ULL << 41)) { 879 ntfs_error(vol->sb, "Volume size (%lluTiB) is too " 880 "large for this architecture. " 881 "Maximum supported is 2TiB. Sorry.", 882 (unsigned long long)ll >> (40 - 883 vol->cluster_size_bits)); 884 return false; 885 } 886 } 887 ll = sle64_to_cpu(b->mft_lcn); 888 if (ll >= vol->nr_clusters) { 889 ntfs_error(vol->sb, "MFT LCN (%lli, 0x%llx) is beyond end of " 890 "volume. Weird.", (unsigned long long)ll, 891 (unsigned long long)ll); 892 return false; 893 } 894 vol->mft_lcn = ll; 895 ntfs_debug("vol->mft_lcn = 0x%llx", (long long)vol->mft_lcn); 896 ll = sle64_to_cpu(b->mftmirr_lcn); 897 if (ll >= vol->nr_clusters) { 898 ntfs_error(vol->sb, "MFTMirr LCN (%lli, 0x%llx) is beyond end " 899 "of volume. Weird.", (unsigned long long)ll, 900 (unsigned long long)ll); 901 return false; 902 } 903 vol->mftmirr_lcn = ll; 904 ntfs_debug("vol->mftmirr_lcn = 0x%llx", (long long)vol->mftmirr_lcn); 905 #ifdef NTFS_RW 906 /* 907 * Work out the size of the mft mirror in number of mft records. If the 908 * cluster size is less than or equal to the size taken by four mft 909 * records, the mft mirror stores the first four mft records. If the 910 * cluster size is bigger than the size taken by four mft records, the 911 * mft mirror contains as many mft records as will fit into one 912 * cluster. 913 */ 914 if (vol->cluster_size <= (4 << vol->mft_record_size_bits)) 915 vol->mftmirr_size = 4; 916 else 917 vol->mftmirr_size = vol->cluster_size >> 918 vol->mft_record_size_bits; 919 ntfs_debug("vol->mftmirr_size = %i", vol->mftmirr_size); 920 #endif /* NTFS_RW */ 921 vol->serial_no = le64_to_cpu(b->volume_serial_number); 922 ntfs_debug("vol->serial_no = 0x%llx", 923 (unsigned long long)vol->serial_no); 924 return true; 925 } 926 927 /** 928 * ntfs_setup_allocators - initialize the cluster and mft allocators 929 * @vol: volume structure for which to setup the allocators 930 * 931 * Setup the cluster (lcn) and mft allocators to the starting values. 932 */ 933 static void ntfs_setup_allocators(ntfs_volume *vol) 934 { 935 #ifdef NTFS_RW 936 LCN mft_zone_size, mft_lcn; 937 #endif /* NTFS_RW */ 938 939 ntfs_debug("vol->mft_zone_multiplier = 0x%x", 940 vol->mft_zone_multiplier); 941 #ifdef NTFS_RW 942 /* Determine the size of the MFT zone. */ 943 mft_zone_size = vol->nr_clusters; 944 switch (vol->mft_zone_multiplier) { /* % of volume size in clusters */ 945 case 4: 946 mft_zone_size >>= 1; /* 50% */ 947 break; 948 case 3: 949 mft_zone_size = (mft_zone_size + 950 (mft_zone_size >> 1)) >> 2; /* 37.5% */ 951 break; 952 case 2: 953 mft_zone_size >>= 2; /* 25% */ 954 break; 955 /* case 1: */ 956 default: 957 mft_zone_size >>= 3; /* 12.5% */ 958 break; 959 } 960 /* Setup the mft zone. */ 961 vol->mft_zone_start = vol->mft_zone_pos = vol->mft_lcn; 962 ntfs_debug("vol->mft_zone_pos = 0x%llx", 963 (unsigned long long)vol->mft_zone_pos); 964 /* 965 * Calculate the mft_lcn for an unmodified NTFS volume (see mkntfs 966 * source) and if the actual mft_lcn is in the expected place or even 967 * further to the front of the volume, extend the mft_zone to cover the 968 * beginning of the volume as well. This is in order to protect the 969 * area reserved for the mft bitmap as well within the mft_zone itself. 970 * On non-standard volumes we do not protect it as the overhead would 971 * be higher than the speed increase we would get by doing it. 972 */ 973 mft_lcn = (8192 + 2 * vol->cluster_size - 1) / vol->cluster_size; 974 if (mft_lcn * vol->cluster_size < 16 * 1024) 975 mft_lcn = (16 * 1024 + vol->cluster_size - 1) / 976 vol->cluster_size; 977 if (vol->mft_zone_start <= mft_lcn) 978 vol->mft_zone_start = 0; 979 ntfs_debug("vol->mft_zone_start = 0x%llx", 980 (unsigned long long)vol->mft_zone_start); 981 /* 982 * Need to cap the mft zone on non-standard volumes so that it does 983 * not point outside the boundaries of the volume. We do this by 984 * halving the zone size until we are inside the volume. 985 */ 986 vol->mft_zone_end = vol->mft_lcn + mft_zone_size; 987 while (vol->mft_zone_end >= vol->nr_clusters) { 988 mft_zone_size >>= 1; 989 vol->mft_zone_end = vol->mft_lcn + mft_zone_size; 990 } 991 ntfs_debug("vol->mft_zone_end = 0x%llx", 992 (unsigned long long)vol->mft_zone_end); 993 /* 994 * Set the current position within each data zone to the start of the 995 * respective zone. 996 */ 997 vol->data1_zone_pos = vol->mft_zone_end; 998 ntfs_debug("vol->data1_zone_pos = 0x%llx", 999 (unsigned long long)vol->data1_zone_pos); 1000 vol->data2_zone_pos = 0; 1001 ntfs_debug("vol->data2_zone_pos = 0x%llx", 1002 (unsigned long long)vol->data2_zone_pos); 1003 1004 /* Set the mft data allocation position to mft record 24. */ 1005 vol->mft_data_pos = 24; 1006 ntfs_debug("vol->mft_data_pos = 0x%llx", 1007 (unsigned long long)vol->mft_data_pos); 1008 #endif /* NTFS_RW */ 1009 } 1010 1011 #ifdef NTFS_RW 1012 1013 /** 1014 * load_and_init_mft_mirror - load and setup the mft mirror inode for a volume 1015 * @vol: ntfs super block describing device whose mft mirror to load 1016 * 1017 * Return 'true' on success or 'false' on error. 1018 */ 1019 static bool load_and_init_mft_mirror(ntfs_volume *vol) 1020 { 1021 struct inode *tmp_ino; 1022 ntfs_inode *tmp_ni; 1023 1024 ntfs_debug("Entering."); 1025 /* Get mft mirror inode. */ 1026 tmp_ino = ntfs_iget(vol->sb, FILE_MFTMirr); 1027 if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { 1028 if (!IS_ERR(tmp_ino)) 1029 iput(tmp_ino); 1030 /* Caller will display error message. */ 1031 return false; 1032 } 1033 /* 1034 * Re-initialize some specifics about $MFTMirr's inode as 1035 * ntfs_read_inode() will have set up the default ones. 1036 */ 1037 /* Set uid and gid to root. */ 1038 tmp_ino->i_uid = tmp_ino->i_gid = 0; 1039 /* Regular file. No access for anyone. */ 1040 tmp_ino->i_mode = S_IFREG; 1041 /* No VFS initiated operations allowed for $MFTMirr. */ 1042 tmp_ino->i_op = &ntfs_empty_inode_ops; 1043 tmp_ino->i_fop = &ntfs_empty_file_ops; 1044 /* Put in our special address space operations. */ 1045 tmp_ino->i_mapping->a_ops = &ntfs_mst_aops; 1046 tmp_ni = NTFS_I(tmp_ino); 1047 /* The $MFTMirr, like the $MFT is multi sector transfer protected. */ 1048 NInoSetMstProtected(tmp_ni); 1049 NInoSetSparseDisabled(tmp_ni); 1050 /* 1051 * Set up our little cheat allowing us to reuse the async read io 1052 * completion handler for directories. 1053 */ 1054 tmp_ni->itype.index.block_size = vol->mft_record_size; 1055 tmp_ni->itype.index.block_size_bits = vol->mft_record_size_bits; 1056 vol->mftmirr_ino = tmp_ino; 1057 ntfs_debug("Done."); 1058 return true; 1059 } 1060 1061 /** 1062 * check_mft_mirror - compare contents of the mft mirror with the mft 1063 * @vol: ntfs super block describing device whose mft mirror to check 1064 * 1065 * Return 'true' on success or 'false' on error. 1066 * 1067 * Note, this function also results in the mft mirror runlist being completely 1068 * mapped into memory. The mft mirror write code requires this and will BUG() 1069 * should it find an unmapped runlist element. 1070 */ 1071 static bool check_mft_mirror(ntfs_volume *vol) 1072 { 1073 struct super_block *sb = vol->sb; 1074 ntfs_inode *mirr_ni; 1075 struct page *mft_page, *mirr_page; 1076 u8 *kmft, *kmirr; 1077 runlist_element *rl, rl2[2]; 1078 pgoff_t index; 1079 int mrecs_per_page, i; 1080 1081 ntfs_debug("Entering."); 1082 /* Compare contents of $MFT and $MFTMirr. */ 1083 mrecs_per_page = PAGE_CACHE_SIZE / vol->mft_record_size; 1084 BUG_ON(!mrecs_per_page); 1085 BUG_ON(!vol->mftmirr_size); 1086 mft_page = mirr_page = NULL; 1087 kmft = kmirr = NULL; 1088 index = i = 0; 1089 do { 1090 u32 bytes; 1091 1092 /* Switch pages if necessary. */ 1093 if (!(i % mrecs_per_page)) { 1094 if (index) { 1095 ntfs_unmap_page(mft_page); 1096 ntfs_unmap_page(mirr_page); 1097 } 1098 /* Get the $MFT page. */ 1099 mft_page = ntfs_map_page(vol->mft_ino->i_mapping, 1100 index); 1101 if (IS_ERR(mft_page)) { 1102 ntfs_error(sb, "Failed to read $MFT."); 1103 return false; 1104 } 1105 kmft = page_address(mft_page); 1106 /* Get the $MFTMirr page. */ 1107 mirr_page = ntfs_map_page(vol->mftmirr_ino->i_mapping, 1108 index); 1109 if (IS_ERR(mirr_page)) { 1110 ntfs_error(sb, "Failed to read $MFTMirr."); 1111 goto mft_unmap_out; 1112 } 1113 kmirr = page_address(mirr_page); 1114 ++index; 1115 } 1116 /* Do not check the record if it is not in use. */ 1117 if (((MFT_RECORD*)kmft)->flags & MFT_RECORD_IN_USE) { 1118 /* Make sure the record is ok. */ 1119 if (ntfs_is_baad_recordp((le32*)kmft)) { 1120 ntfs_error(sb, "Incomplete multi sector " 1121 "transfer detected in mft " 1122 "record %i.", i); 1123 mm_unmap_out: 1124 ntfs_unmap_page(mirr_page); 1125 mft_unmap_out: 1126 ntfs_unmap_page(mft_page); 1127 return false; 1128 } 1129 } 1130 /* Do not check the mirror record if it is not in use. */ 1131 if (((MFT_RECORD*)kmirr)->flags & MFT_RECORD_IN_USE) { 1132 if (ntfs_is_baad_recordp((le32*)kmirr)) { 1133 ntfs_error(sb, "Incomplete multi sector " 1134 "transfer detected in mft " 1135 "mirror record %i.", i); 1136 goto mm_unmap_out; 1137 } 1138 } 1139 /* Get the amount of data in the current record. */ 1140 bytes = le32_to_cpu(((MFT_RECORD*)kmft)->bytes_in_use); 1141 if (bytes < sizeof(MFT_RECORD_OLD) || 1142 bytes > vol->mft_record_size || 1143 ntfs_is_baad_recordp((le32*)kmft)) { 1144 bytes = le32_to_cpu(((MFT_RECORD*)kmirr)->bytes_in_use); 1145 if (bytes < sizeof(MFT_RECORD_OLD) || 1146 bytes > vol->mft_record_size || 1147 ntfs_is_baad_recordp((le32*)kmirr)) 1148 bytes = vol->mft_record_size; 1149 } 1150 /* Compare the two records. */ 1151 if (memcmp(kmft, kmirr, bytes)) { 1152 ntfs_error(sb, "$MFT and $MFTMirr (record %i) do not " 1153 "match. Run ntfsfix or chkdsk.", i); 1154 goto mm_unmap_out; 1155 } 1156 kmft += vol->mft_record_size; 1157 kmirr += vol->mft_record_size; 1158 } while (++i < vol->mftmirr_size); 1159 /* Release the last pages. */ 1160 ntfs_unmap_page(mft_page); 1161 ntfs_unmap_page(mirr_page); 1162 1163 /* Construct the mft mirror runlist by hand. */ 1164 rl2[0].vcn = 0; 1165 rl2[0].lcn = vol->mftmirr_lcn; 1166 rl2[0].length = (vol->mftmirr_size * vol->mft_record_size + 1167 vol->cluster_size - 1) / vol->cluster_size; 1168 rl2[1].vcn = rl2[0].length; 1169 rl2[1].lcn = LCN_ENOENT; 1170 rl2[1].length = 0; 1171 /* 1172 * Because we have just read all of the mft mirror, we know we have 1173 * mapped the full runlist for it. 1174 */ 1175 mirr_ni = NTFS_I(vol->mftmirr_ino); 1176 down_read(&mirr_ni->runlist.lock); 1177 rl = mirr_ni->runlist.rl; 1178 /* Compare the two runlists. They must be identical. */ 1179 i = 0; 1180 do { 1181 if (rl2[i].vcn != rl[i].vcn || rl2[i].lcn != rl[i].lcn || 1182 rl2[i].length != rl[i].length) { 1183 ntfs_error(sb, "$MFTMirr location mismatch. " 1184 "Run chkdsk."); 1185 up_read(&mirr_ni->runlist.lock); 1186 return false; 1187 } 1188 } while (rl2[i++].length); 1189 up_read(&mirr_ni->runlist.lock); 1190 ntfs_debug("Done."); 1191 return true; 1192 } 1193 1194 /** 1195 * load_and_check_logfile - load and check the logfile inode for a volume 1196 * @vol: ntfs super block describing device whose logfile to load 1197 * 1198 * Return 'true' on success or 'false' on error. 1199 */ 1200 static bool load_and_check_logfile(ntfs_volume *vol, 1201 RESTART_PAGE_HEADER **rp) 1202 { 1203 struct inode *tmp_ino; 1204 1205 ntfs_debug("Entering."); 1206 tmp_ino = ntfs_iget(vol->sb, FILE_LogFile); 1207 if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { 1208 if (!IS_ERR(tmp_ino)) 1209 iput(tmp_ino); 1210 /* Caller will display error message. */ 1211 return false; 1212 } 1213 if (!ntfs_check_logfile(tmp_ino, rp)) { 1214 iput(tmp_ino); 1215 /* ntfs_check_logfile() will have displayed error output. */ 1216 return false; 1217 } 1218 NInoSetSparseDisabled(NTFS_I(tmp_ino)); 1219 vol->logfile_ino = tmp_ino; 1220 ntfs_debug("Done."); 1221 return true; 1222 } 1223 1224 #define NTFS_HIBERFIL_HEADER_SIZE 4096 1225 1226 /** 1227 * check_windows_hibernation_status - check if Windows is suspended on a volume 1228 * @vol: ntfs super block of device to check 1229 * 1230 * Check if Windows is hibernated on the ntfs volume @vol. This is done by 1231 * looking for the file hiberfil.sys in the root directory of the volume. If 1232 * the file is not present Windows is definitely not suspended. 1233 * 1234 * If hiberfil.sys exists and is less than 4kiB in size it means Windows is 1235 * definitely suspended (this volume is not the system volume). Caveat: on a 1236 * system with many volumes it is possible that the < 4kiB check is bogus but 1237 * for now this should do fine. 1238 * 1239 * If hiberfil.sys exists and is larger than 4kiB in size, we need to read the 1240 * hiberfil header (which is the first 4kiB). If this begins with "hibr", 1241 * Windows is definitely suspended. If it is completely full of zeroes, 1242 * Windows is definitely not hibernated. Any other case is treated as if 1243 * Windows is suspended. This caters for the above mentioned caveat of a 1244 * system with many volumes where no "hibr" magic would be present and there is 1245 * no zero header. 1246 * 1247 * Return 0 if Windows is not hibernated on the volume, >0 if Windows is 1248 * hibernated on the volume, and -errno on error. 1249 */ 1250 static int check_windows_hibernation_status(ntfs_volume *vol) 1251 { 1252 MFT_REF mref; 1253 struct inode *vi; 1254 ntfs_inode *ni; 1255 struct page *page; 1256 u32 *kaddr, *kend; 1257 ntfs_name *name = NULL; 1258 int ret = 1; 1259 static const ntfschar hiberfil[13] = { cpu_to_le16('h'), 1260 cpu_to_le16('i'), cpu_to_le16('b'), 1261 cpu_to_le16('e'), cpu_to_le16('r'), 1262 cpu_to_le16('f'), cpu_to_le16('i'), 1263 cpu_to_le16('l'), cpu_to_le16('.'), 1264 cpu_to_le16('s'), cpu_to_le16('y'), 1265 cpu_to_le16('s'), 0 }; 1266 1267 ntfs_debug("Entering."); 1268 /* 1269 * Find the inode number for the hibernation file by looking up the 1270 * filename hiberfil.sys in the root directory. 1271 */ 1272 mutex_lock(&vol->root_ino->i_mutex); 1273 mref = ntfs_lookup_inode_by_name(NTFS_I(vol->root_ino), hiberfil, 12, 1274 &name); 1275 mutex_unlock(&vol->root_ino->i_mutex); 1276 if (IS_ERR_MREF(mref)) { 1277 ret = MREF_ERR(mref); 1278 /* If the file does not exist, Windows is not hibernated. */ 1279 if (ret == -ENOENT) { 1280 ntfs_debug("hiberfil.sys not present. Windows is not " 1281 "hibernated on the volume."); 1282 return 0; 1283 } 1284 /* A real error occured. */ 1285 ntfs_error(vol->sb, "Failed to find inode number for " 1286 "hiberfil.sys."); 1287 return ret; 1288 } 1289 /* We do not care for the type of match that was found. */ 1290 kfree(name); 1291 /* Get the inode. */ 1292 vi = ntfs_iget(vol->sb, MREF(mref)); 1293 if (IS_ERR(vi) || is_bad_inode(vi)) { 1294 if (!IS_ERR(vi)) 1295 iput(vi); 1296 ntfs_error(vol->sb, "Failed to load hiberfil.sys."); 1297 return IS_ERR(vi) ? PTR_ERR(vi) : -EIO; 1298 } 1299 if (unlikely(i_size_read(vi) < NTFS_HIBERFIL_HEADER_SIZE)) { 1300 ntfs_debug("hiberfil.sys is smaller than 4kiB (0x%llx). " 1301 "Windows is hibernated on the volume. This " 1302 "is not the system volume.", i_size_read(vi)); 1303 goto iput_out; 1304 } 1305 ni = NTFS_I(vi); 1306 page = ntfs_map_page(vi->i_mapping, 0); 1307 if (IS_ERR(page)) { 1308 ntfs_error(vol->sb, "Failed to read from hiberfil.sys."); 1309 ret = PTR_ERR(page); 1310 goto iput_out; 1311 } 1312 kaddr = (u32*)page_address(page); 1313 if (*(le32*)kaddr == cpu_to_le32(0x72626968)/*'hibr'*/) { 1314 ntfs_debug("Magic \"hibr\" found in hiberfil.sys. Windows is " 1315 "hibernated on the volume. This is the " 1316 "system volume."); 1317 goto unm_iput_out; 1318 } 1319 kend = kaddr + NTFS_HIBERFIL_HEADER_SIZE/sizeof(*kaddr); 1320 do { 1321 if (unlikely(*kaddr)) { 1322 ntfs_debug("hiberfil.sys is larger than 4kiB " 1323 "(0x%llx), does not contain the " 1324 "\"hibr\" magic, and does not have a " 1325 "zero header. Windows is hibernated " 1326 "on the volume. This is not the " 1327 "system volume.", i_size_read(vi)); 1328 goto unm_iput_out; 1329 } 1330 } while (++kaddr < kend); 1331 ntfs_debug("hiberfil.sys contains a zero header. Windows is not " 1332 "hibernated on the volume. This is the system " 1333 "volume."); 1334 ret = 0; 1335 unm_iput_out: 1336 ntfs_unmap_page(page); 1337 iput_out: 1338 iput(vi); 1339 return ret; 1340 } 1341 1342 /** 1343 * load_and_init_quota - load and setup the quota file for a volume if present 1344 * @vol: ntfs super block describing device whose quota file to load 1345 * 1346 * Return 'true' on success or 'false' on error. If $Quota is not present, we 1347 * leave vol->quota_ino as NULL and return success. 1348 */ 1349 static bool load_and_init_quota(ntfs_volume *vol) 1350 { 1351 MFT_REF mref; 1352 struct inode *tmp_ino; 1353 ntfs_name *name = NULL; 1354 static const ntfschar Quota[7] = { cpu_to_le16('$'), 1355 cpu_to_le16('Q'), cpu_to_le16('u'), 1356 cpu_to_le16('o'), cpu_to_le16('t'), 1357 cpu_to_le16('a'), 0 }; 1358 static ntfschar Q[3] = { cpu_to_le16('$'), 1359 cpu_to_le16('Q'), 0 }; 1360 1361 ntfs_debug("Entering."); 1362 /* 1363 * Find the inode number for the quota file by looking up the filename 1364 * $Quota in the extended system files directory $Extend. 1365 */ 1366 mutex_lock(&vol->extend_ino->i_mutex); 1367 mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), Quota, 6, 1368 &name); 1369 mutex_unlock(&vol->extend_ino->i_mutex); 1370 if (IS_ERR_MREF(mref)) { 1371 /* 1372 * If the file does not exist, quotas are disabled and have 1373 * never been enabled on this volume, just return success. 1374 */ 1375 if (MREF_ERR(mref) == -ENOENT) { 1376 ntfs_debug("$Quota not present. Volume does not have " 1377 "quotas enabled."); 1378 /* 1379 * No need to try to set quotas out of date if they are 1380 * not enabled. 1381 */ 1382 NVolSetQuotaOutOfDate(vol); 1383 return true; 1384 } 1385 /* A real error occured. */ 1386 ntfs_error(vol->sb, "Failed to find inode number for $Quota."); 1387 return false; 1388 } 1389 /* We do not care for the type of match that was found. */ 1390 kfree(name); 1391 /* Get the inode. */ 1392 tmp_ino = ntfs_iget(vol->sb, MREF(mref)); 1393 if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { 1394 if (!IS_ERR(tmp_ino)) 1395 iput(tmp_ino); 1396 ntfs_error(vol->sb, "Failed to load $Quota."); 1397 return false; 1398 } 1399 vol->quota_ino = tmp_ino; 1400 /* Get the $Q index allocation attribute. */ 1401 tmp_ino = ntfs_index_iget(vol->quota_ino, Q, 2); 1402 if (IS_ERR(tmp_ino)) { 1403 ntfs_error(vol->sb, "Failed to load $Quota/$Q index."); 1404 return false; 1405 } 1406 vol->quota_q_ino = tmp_ino; 1407 ntfs_debug("Done."); 1408 return true; 1409 } 1410 1411 /** 1412 * load_and_init_usnjrnl - load and setup the transaction log if present 1413 * @vol: ntfs super block describing device whose usnjrnl file to load 1414 * 1415 * Return 'true' on success or 'false' on error. 1416 * 1417 * If $UsnJrnl is not present or in the process of being disabled, we set 1418 * NVolUsnJrnlStamped() and return success. 1419 * 1420 * If the $UsnJrnl $DATA/$J attribute has a size equal to the lowest valid usn, 1421 * i.e. transaction logging has only just been enabled or the journal has been 1422 * stamped and nothing has been logged since, we also set NVolUsnJrnlStamped() 1423 * and return success. 1424 */ 1425 static bool load_and_init_usnjrnl(ntfs_volume *vol) 1426 { 1427 MFT_REF mref; 1428 struct inode *tmp_ino; 1429 ntfs_inode *tmp_ni; 1430 struct page *page; 1431 ntfs_name *name = NULL; 1432 USN_HEADER *uh; 1433 static const ntfschar UsnJrnl[9] = { cpu_to_le16('$'), 1434 cpu_to_le16('U'), cpu_to_le16('s'), 1435 cpu_to_le16('n'), cpu_to_le16('J'), 1436 cpu_to_le16('r'), cpu_to_le16('n'), 1437 cpu_to_le16('l'), 0 }; 1438 static ntfschar Max[5] = { cpu_to_le16('$'), 1439 cpu_to_le16('M'), cpu_to_le16('a'), 1440 cpu_to_le16('x'), 0 }; 1441 static ntfschar J[3] = { cpu_to_le16('$'), 1442 cpu_to_le16('J'), 0 }; 1443 1444 ntfs_debug("Entering."); 1445 /* 1446 * Find the inode number for the transaction log file by looking up the 1447 * filename $UsnJrnl in the extended system files directory $Extend. 1448 */ 1449 mutex_lock(&vol->extend_ino->i_mutex); 1450 mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), UsnJrnl, 8, 1451 &name); 1452 mutex_unlock(&vol->extend_ino->i_mutex); 1453 if (IS_ERR_MREF(mref)) { 1454 /* 1455 * If the file does not exist, transaction logging is disabled, 1456 * just return success. 1457 */ 1458 if (MREF_ERR(mref) == -ENOENT) { 1459 ntfs_debug("$UsnJrnl not present. Volume does not " 1460 "have transaction logging enabled."); 1461 not_enabled: 1462 /* 1463 * No need to try to stamp the transaction log if 1464 * transaction logging is not enabled. 1465 */ 1466 NVolSetUsnJrnlStamped(vol); 1467 return true; 1468 } 1469 /* A real error occured. */ 1470 ntfs_error(vol->sb, "Failed to find inode number for " 1471 "$UsnJrnl."); 1472 return false; 1473 } 1474 /* We do not care for the type of match that was found. */ 1475 kfree(name); 1476 /* Get the inode. */ 1477 tmp_ino = ntfs_iget(vol->sb, MREF(mref)); 1478 if (unlikely(IS_ERR(tmp_ino) || is_bad_inode(tmp_ino))) { 1479 if (!IS_ERR(tmp_ino)) 1480 iput(tmp_ino); 1481 ntfs_error(vol->sb, "Failed to load $UsnJrnl."); 1482 return false; 1483 } 1484 vol->usnjrnl_ino = tmp_ino; 1485 /* 1486 * If the transaction log is in the process of being deleted, we can 1487 * ignore it. 1488 */ 1489 if (unlikely(vol->vol_flags & VOLUME_DELETE_USN_UNDERWAY)) { 1490 ntfs_debug("$UsnJrnl in the process of being disabled. " 1491 "Volume does not have transaction logging " 1492 "enabled."); 1493 goto not_enabled; 1494 } 1495 /* Get the $DATA/$Max attribute. */ 1496 tmp_ino = ntfs_attr_iget(vol->usnjrnl_ino, AT_DATA, Max, 4); 1497 if (IS_ERR(tmp_ino)) { 1498 ntfs_error(vol->sb, "Failed to load $UsnJrnl/$DATA/$Max " 1499 "attribute."); 1500 return false; 1501 } 1502 vol->usnjrnl_max_ino = tmp_ino; 1503 if (unlikely(i_size_read(tmp_ino) < sizeof(USN_HEADER))) { 1504 ntfs_error(vol->sb, "Found corrupt $UsnJrnl/$DATA/$Max " 1505 "attribute (size is 0x%llx but should be at " 1506 "least 0x%zx bytes).", i_size_read(tmp_ino), 1507 sizeof(USN_HEADER)); 1508 return false; 1509 } 1510 /* Get the $DATA/$J attribute. */ 1511 tmp_ino = ntfs_attr_iget(vol->usnjrnl_ino, AT_DATA, J, 2); 1512 if (IS_ERR(tmp_ino)) { 1513 ntfs_error(vol->sb, "Failed to load $UsnJrnl/$DATA/$J " 1514 "attribute."); 1515 return false; 1516 } 1517 vol->usnjrnl_j_ino = tmp_ino; 1518 /* Verify $J is non-resident and sparse. */ 1519 tmp_ni = NTFS_I(vol->usnjrnl_j_ino); 1520 if (unlikely(!NInoNonResident(tmp_ni) || !NInoSparse(tmp_ni))) { 1521 ntfs_error(vol->sb, "$UsnJrnl/$DATA/$J attribute is resident " 1522 "and/or not sparse."); 1523 return false; 1524 } 1525 /* Read the USN_HEADER from $DATA/$Max. */ 1526 page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0); 1527 if (IS_ERR(page)) { 1528 ntfs_error(vol->sb, "Failed to read from $UsnJrnl/$DATA/$Max " 1529 "attribute."); 1530 return false; 1531 } 1532 uh = (USN_HEADER*)page_address(page); 1533 /* Sanity check the $Max. */ 1534 if (unlikely(sle64_to_cpu(uh->allocation_delta) > 1535 sle64_to_cpu(uh->maximum_size))) { 1536 ntfs_error(vol->sb, "Allocation delta (0x%llx) exceeds " 1537 "maximum size (0x%llx). $UsnJrnl is corrupt.", 1538 (long long)sle64_to_cpu(uh->allocation_delta), 1539 (long long)sle64_to_cpu(uh->maximum_size)); 1540 ntfs_unmap_page(page); 1541 return false; 1542 } 1543 /* 1544 * If the transaction log has been stamped and nothing has been written 1545 * to it since, we do not need to stamp it. 1546 */ 1547 if (unlikely(sle64_to_cpu(uh->lowest_valid_usn) >= 1548 i_size_read(vol->usnjrnl_j_ino))) { 1549 if (likely(sle64_to_cpu(uh->lowest_valid_usn) == 1550 i_size_read(vol->usnjrnl_j_ino))) { 1551 ntfs_unmap_page(page); 1552 ntfs_debug("$UsnJrnl is enabled but nothing has been " 1553 "logged since it was last stamped. " 1554 "Treating this as if the volume does " 1555 "not have transaction logging " 1556 "enabled."); 1557 goto not_enabled; 1558 } 1559 ntfs_error(vol->sb, "$UsnJrnl has lowest valid usn (0x%llx) " 1560 "which is out of bounds (0x%llx). $UsnJrnl " 1561 "is corrupt.", 1562 (long long)sle64_to_cpu(uh->lowest_valid_usn), 1563 i_size_read(vol->usnjrnl_j_ino)); 1564 ntfs_unmap_page(page); 1565 return false; 1566 } 1567 ntfs_unmap_page(page); 1568 ntfs_debug("Done."); 1569 return true; 1570 } 1571 1572 /** 1573 * load_and_init_attrdef - load the attribute definitions table for a volume 1574 * @vol: ntfs super block describing device whose attrdef to load 1575 * 1576 * Return 'true' on success or 'false' on error. 1577 */ 1578 static bool load_and_init_attrdef(ntfs_volume *vol) 1579 { 1580 loff_t i_size; 1581 struct super_block *sb = vol->sb; 1582 struct inode *ino; 1583 struct page *page; 1584 pgoff_t index, max_index; 1585 unsigned int size; 1586 1587 ntfs_debug("Entering."); 1588 /* Read attrdef table and setup vol->attrdef and vol->attrdef_size. */ 1589 ino = ntfs_iget(sb, FILE_AttrDef); 1590 if (IS_ERR(ino) || is_bad_inode(ino)) { 1591 if (!IS_ERR(ino)) 1592 iput(ino); 1593 goto failed; 1594 } 1595 NInoSetSparseDisabled(NTFS_I(ino)); 1596 /* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */ 1597 i_size = i_size_read(ino); 1598 if (i_size <= 0 || i_size > 0x7fffffff) 1599 goto iput_failed; 1600 vol->attrdef = (ATTR_DEF*)ntfs_malloc_nofs(i_size); 1601 if (!vol->attrdef) 1602 goto iput_failed; 1603 index = 0; 1604 max_index = i_size >> PAGE_CACHE_SHIFT; 1605 size = PAGE_CACHE_SIZE; 1606 while (index < max_index) { 1607 /* Read the attrdef table and copy it into the linear buffer. */ 1608 read_partial_attrdef_page: 1609 page = ntfs_map_page(ino->i_mapping, index); 1610 if (IS_ERR(page)) 1611 goto free_iput_failed; 1612 memcpy((u8*)vol->attrdef + (index++ << PAGE_CACHE_SHIFT), 1613 page_address(page), size); 1614 ntfs_unmap_page(page); 1615 }; 1616 if (size == PAGE_CACHE_SIZE) { 1617 size = i_size & ~PAGE_CACHE_MASK; 1618 if (size) 1619 goto read_partial_attrdef_page; 1620 } 1621 vol->attrdef_size = i_size; 1622 ntfs_debug("Read %llu bytes from $AttrDef.", i_size); 1623 iput(ino); 1624 return true; 1625 free_iput_failed: 1626 ntfs_free(vol->attrdef); 1627 vol->attrdef = NULL; 1628 iput_failed: 1629 iput(ino); 1630 failed: 1631 ntfs_error(sb, "Failed to initialize attribute definition table."); 1632 return false; 1633 } 1634 1635 #endif /* NTFS_RW */ 1636 1637 /** 1638 * load_and_init_upcase - load the upcase table for an ntfs volume 1639 * @vol: ntfs super block describing device whose upcase to load 1640 * 1641 * Return 'true' on success or 'false' on error. 1642 */ 1643 static bool load_and_init_upcase(ntfs_volume *vol) 1644 { 1645 loff_t i_size; 1646 struct super_block *sb = vol->sb; 1647 struct inode *ino; 1648 struct page *page; 1649 pgoff_t index, max_index; 1650 unsigned int size; 1651 int i, max; 1652 1653 ntfs_debug("Entering."); 1654 /* Read upcase table and setup vol->upcase and vol->upcase_len. */ 1655 ino = ntfs_iget(sb, FILE_UpCase); 1656 if (IS_ERR(ino) || is_bad_inode(ino)) { 1657 if (!IS_ERR(ino)) 1658 iput(ino); 1659 goto upcase_failed; 1660 } 1661 /* 1662 * The upcase size must not be above 64k Unicode characters, must not 1663 * be zero and must be a multiple of sizeof(ntfschar). 1664 */ 1665 i_size = i_size_read(ino); 1666 if (!i_size || i_size & (sizeof(ntfschar) - 1) || 1667 i_size > 64ULL * 1024 * sizeof(ntfschar)) 1668 goto iput_upcase_failed; 1669 vol->upcase = (ntfschar*)ntfs_malloc_nofs(i_size); 1670 if (!vol->upcase) 1671 goto iput_upcase_failed; 1672 index = 0; 1673 max_index = i_size >> PAGE_CACHE_SHIFT; 1674 size = PAGE_CACHE_SIZE; 1675 while (index < max_index) { 1676 /* Read the upcase table and copy it into the linear buffer. */ 1677 read_partial_upcase_page: 1678 page = ntfs_map_page(ino->i_mapping, index); 1679 if (IS_ERR(page)) 1680 goto iput_upcase_failed; 1681 memcpy((char*)vol->upcase + (index++ << PAGE_CACHE_SHIFT), 1682 page_address(page), size); 1683 ntfs_unmap_page(page); 1684 }; 1685 if (size == PAGE_CACHE_SIZE) { 1686 size = i_size & ~PAGE_CACHE_MASK; 1687 if (size) 1688 goto read_partial_upcase_page; 1689 } 1690 vol->upcase_len = i_size >> UCHAR_T_SIZE_BITS; 1691 ntfs_debug("Read %llu bytes from $UpCase (expected %zu bytes).", 1692 i_size, 64 * 1024 * sizeof(ntfschar)); 1693 iput(ino); 1694 mutex_lock(&ntfs_lock); 1695 if (!default_upcase) { 1696 ntfs_debug("Using volume specified $UpCase since default is " 1697 "not present."); 1698 mutex_unlock(&ntfs_lock); 1699 return true; 1700 } 1701 max = default_upcase_len; 1702 if (max > vol->upcase_len) 1703 max = vol->upcase_len; 1704 for (i = 0; i < max; i++) 1705 if (vol->upcase[i] != default_upcase[i]) 1706 break; 1707 if (i == max) { 1708 ntfs_free(vol->upcase); 1709 vol->upcase = default_upcase; 1710 vol->upcase_len = max; 1711 ntfs_nr_upcase_users++; 1712 mutex_unlock(&ntfs_lock); 1713 ntfs_debug("Volume specified $UpCase matches default. Using " 1714 "default."); 1715 return true; 1716 } 1717 mutex_unlock(&ntfs_lock); 1718 ntfs_debug("Using volume specified $UpCase since it does not match " 1719 "the default."); 1720 return true; 1721 iput_upcase_failed: 1722 iput(ino); 1723 ntfs_free(vol->upcase); 1724 vol->upcase = NULL; 1725 upcase_failed: 1726 mutex_lock(&ntfs_lock); 1727 if (default_upcase) { 1728 vol->upcase = default_upcase; 1729 vol->upcase_len = default_upcase_len; 1730 ntfs_nr_upcase_users++; 1731 mutex_unlock(&ntfs_lock); 1732 ntfs_error(sb, "Failed to load $UpCase from the volume. Using " 1733 "default."); 1734 return true; 1735 } 1736 mutex_unlock(&ntfs_lock); 1737 ntfs_error(sb, "Failed to initialize upcase table."); 1738 return false; 1739 } 1740 1741 /* 1742 * The lcn and mft bitmap inodes are NTFS-internal inodes with 1743 * their own special locking rules: 1744 */ 1745 static struct lock_class_key 1746 lcnbmp_runlist_lock_key, lcnbmp_mrec_lock_key, 1747 mftbmp_runlist_lock_key, mftbmp_mrec_lock_key; 1748 1749 /** 1750 * load_system_files - open the system files using normal functions 1751 * @vol: ntfs super block describing device whose system files to load 1752 * 1753 * Open the system files with normal access functions and complete setting up 1754 * the ntfs super block @vol. 1755 * 1756 * Return 'true' on success or 'false' on error. 1757 */ 1758 static bool load_system_files(ntfs_volume *vol) 1759 { 1760 struct super_block *sb = vol->sb; 1761 MFT_RECORD *m; 1762 VOLUME_INFORMATION *vi; 1763 ntfs_attr_search_ctx *ctx; 1764 #ifdef NTFS_RW 1765 RESTART_PAGE_HEADER *rp; 1766 int err; 1767 #endif /* NTFS_RW */ 1768 1769 ntfs_debug("Entering."); 1770 #ifdef NTFS_RW 1771 /* Get mft mirror inode compare the contents of $MFT and $MFTMirr. */ 1772 if (!load_and_init_mft_mirror(vol) || !check_mft_mirror(vol)) { 1773 static const char *es1 = "Failed to load $MFTMirr"; 1774 static const char *es2 = "$MFTMirr does not match $MFT"; 1775 static const char *es3 = ". Run ntfsfix and/or chkdsk."; 1776 1777 /* If a read-write mount, convert it to a read-only mount. */ 1778 if (!(sb->s_flags & MS_RDONLY)) { 1779 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 1780 ON_ERRORS_CONTINUE))) { 1781 ntfs_error(sb, "%s and neither on_errors=" 1782 "continue nor on_errors=" 1783 "remount-ro was specified%s", 1784 !vol->mftmirr_ino ? es1 : es2, 1785 es3); 1786 goto iput_mirr_err_out; 1787 } 1788 sb->s_flags |= MS_RDONLY; 1789 ntfs_error(sb, "%s. Mounting read-only%s", 1790 !vol->mftmirr_ino ? es1 : es2, es3); 1791 } else 1792 ntfs_warning(sb, "%s. Will not be able to remount " 1793 "read-write%s", 1794 !vol->mftmirr_ino ? es1 : es2, es3); 1795 /* This will prevent a read-write remount. */ 1796 NVolSetErrors(vol); 1797 } 1798 #endif /* NTFS_RW */ 1799 /* Get mft bitmap attribute inode. */ 1800 vol->mftbmp_ino = ntfs_attr_iget(vol->mft_ino, AT_BITMAP, NULL, 0); 1801 if (IS_ERR(vol->mftbmp_ino)) { 1802 ntfs_error(sb, "Failed to load $MFT/$BITMAP attribute."); 1803 goto iput_mirr_err_out; 1804 } 1805 lockdep_set_class(&NTFS_I(vol->mftbmp_ino)->runlist.lock, 1806 &mftbmp_runlist_lock_key); 1807 lockdep_set_class(&NTFS_I(vol->mftbmp_ino)->mrec_lock, 1808 &mftbmp_mrec_lock_key); 1809 /* Read upcase table and setup @vol->upcase and @vol->upcase_len. */ 1810 if (!load_and_init_upcase(vol)) 1811 goto iput_mftbmp_err_out; 1812 #ifdef NTFS_RW 1813 /* 1814 * Read attribute definitions table and setup @vol->attrdef and 1815 * @vol->attrdef_size. 1816 */ 1817 if (!load_and_init_attrdef(vol)) 1818 goto iput_upcase_err_out; 1819 #endif /* NTFS_RW */ 1820 /* 1821 * Get the cluster allocation bitmap inode and verify the size, no 1822 * need for any locking at this stage as we are already running 1823 * exclusively as we are mount in progress task. 1824 */ 1825 vol->lcnbmp_ino = ntfs_iget(sb, FILE_Bitmap); 1826 if (IS_ERR(vol->lcnbmp_ino) || is_bad_inode(vol->lcnbmp_ino)) { 1827 if (!IS_ERR(vol->lcnbmp_ino)) 1828 iput(vol->lcnbmp_ino); 1829 goto bitmap_failed; 1830 } 1831 lockdep_set_class(&NTFS_I(vol->lcnbmp_ino)->runlist.lock, 1832 &lcnbmp_runlist_lock_key); 1833 lockdep_set_class(&NTFS_I(vol->lcnbmp_ino)->mrec_lock, 1834 &lcnbmp_mrec_lock_key); 1835 1836 NInoSetSparseDisabled(NTFS_I(vol->lcnbmp_ino)); 1837 if ((vol->nr_clusters + 7) >> 3 > i_size_read(vol->lcnbmp_ino)) { 1838 iput(vol->lcnbmp_ino); 1839 bitmap_failed: 1840 ntfs_error(sb, "Failed to load $Bitmap."); 1841 goto iput_attrdef_err_out; 1842 } 1843 /* 1844 * Get the volume inode and setup our cache of the volume flags and 1845 * version. 1846 */ 1847 vol->vol_ino = ntfs_iget(sb, FILE_Volume); 1848 if (IS_ERR(vol->vol_ino) || is_bad_inode(vol->vol_ino)) { 1849 if (!IS_ERR(vol->vol_ino)) 1850 iput(vol->vol_ino); 1851 volume_failed: 1852 ntfs_error(sb, "Failed to load $Volume."); 1853 goto iput_lcnbmp_err_out; 1854 } 1855 m = map_mft_record(NTFS_I(vol->vol_ino)); 1856 if (IS_ERR(m)) { 1857 iput_volume_failed: 1858 iput(vol->vol_ino); 1859 goto volume_failed; 1860 } 1861 if (!(ctx = ntfs_attr_get_search_ctx(NTFS_I(vol->vol_ino), m))) { 1862 ntfs_error(sb, "Failed to get attribute search context."); 1863 goto get_ctx_vol_failed; 1864 } 1865 if (ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0, 1866 ctx) || ctx->attr->non_resident || ctx->attr->flags) { 1867 err_put_vol: 1868 ntfs_attr_put_search_ctx(ctx); 1869 get_ctx_vol_failed: 1870 unmap_mft_record(NTFS_I(vol->vol_ino)); 1871 goto iput_volume_failed; 1872 } 1873 vi = (VOLUME_INFORMATION*)((char*)ctx->attr + 1874 le16_to_cpu(ctx->attr->data.resident.value_offset)); 1875 /* Some bounds checks. */ 1876 if ((u8*)vi < (u8*)ctx->attr || (u8*)vi + 1877 le32_to_cpu(ctx->attr->data.resident.value_length) > 1878 (u8*)ctx->attr + le32_to_cpu(ctx->attr->length)) 1879 goto err_put_vol; 1880 /* Copy the volume flags and version to the ntfs_volume structure. */ 1881 vol->vol_flags = vi->flags; 1882 vol->major_ver = vi->major_ver; 1883 vol->minor_ver = vi->minor_ver; 1884 ntfs_attr_put_search_ctx(ctx); 1885 unmap_mft_record(NTFS_I(vol->vol_ino)); 1886 printk(KERN_INFO "NTFS volume version %i.%i.\n", vol->major_ver, 1887 vol->minor_ver); 1888 if (vol->major_ver < 3 && NVolSparseEnabled(vol)) { 1889 ntfs_warning(vol->sb, "Disabling sparse support due to NTFS " 1890 "volume version %i.%i (need at least version " 1891 "3.0).", vol->major_ver, vol->minor_ver); 1892 NVolClearSparseEnabled(vol); 1893 } 1894 #ifdef NTFS_RW 1895 /* Make sure that no unsupported volume flags are set. */ 1896 if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { 1897 static const char *es1a = "Volume is dirty"; 1898 static const char *es1b = "Volume has been modified by chkdsk"; 1899 static const char *es1c = "Volume has unsupported flags set"; 1900 static const char *es2a = ". Run chkdsk and mount in Windows."; 1901 static const char *es2b = ". Mount in Windows."; 1902 const char *es1, *es2; 1903 1904 es2 = es2a; 1905 if (vol->vol_flags & VOLUME_IS_DIRTY) 1906 es1 = es1a; 1907 else if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) { 1908 es1 = es1b; 1909 es2 = es2b; 1910 } else { 1911 es1 = es1c; 1912 ntfs_warning(sb, "Unsupported volume flags 0x%x " 1913 "encountered.", 1914 (unsigned)le16_to_cpu(vol->vol_flags)); 1915 } 1916 /* If a read-write mount, convert it to a read-only mount. */ 1917 if (!(sb->s_flags & MS_RDONLY)) { 1918 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 1919 ON_ERRORS_CONTINUE))) { 1920 ntfs_error(sb, "%s and neither on_errors=" 1921 "continue nor on_errors=" 1922 "remount-ro was specified%s", 1923 es1, es2); 1924 goto iput_vol_err_out; 1925 } 1926 sb->s_flags |= MS_RDONLY; 1927 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 1928 } else 1929 ntfs_warning(sb, "%s. Will not be able to remount " 1930 "read-write%s", es1, es2); 1931 /* 1932 * Do not set NVolErrors() because ntfs_remount() re-checks the 1933 * flags which we need to do in case any flags have changed. 1934 */ 1935 } 1936 /* 1937 * Get the inode for the logfile, check it and determine if the volume 1938 * was shutdown cleanly. 1939 */ 1940 rp = NULL; 1941 if (!load_and_check_logfile(vol, &rp) || 1942 !ntfs_is_logfile_clean(vol->logfile_ino, rp)) { 1943 static const char *es1a = "Failed to load $LogFile"; 1944 static const char *es1b = "$LogFile is not clean"; 1945 static const char *es2 = ". Mount in Windows."; 1946 const char *es1; 1947 1948 es1 = !vol->logfile_ino ? es1a : es1b; 1949 /* If a read-write mount, convert it to a read-only mount. */ 1950 if (!(sb->s_flags & MS_RDONLY)) { 1951 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 1952 ON_ERRORS_CONTINUE))) { 1953 ntfs_error(sb, "%s and neither on_errors=" 1954 "continue nor on_errors=" 1955 "remount-ro was specified%s", 1956 es1, es2); 1957 if (vol->logfile_ino) { 1958 BUG_ON(!rp); 1959 ntfs_free(rp); 1960 } 1961 goto iput_logfile_err_out; 1962 } 1963 sb->s_flags |= MS_RDONLY; 1964 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 1965 } else 1966 ntfs_warning(sb, "%s. Will not be able to remount " 1967 "read-write%s", es1, es2); 1968 /* This will prevent a read-write remount. */ 1969 NVolSetErrors(vol); 1970 } 1971 ntfs_free(rp); 1972 #endif /* NTFS_RW */ 1973 /* Get the root directory inode so we can do path lookups. */ 1974 vol->root_ino = ntfs_iget(sb, FILE_root); 1975 if (IS_ERR(vol->root_ino) || is_bad_inode(vol->root_ino)) { 1976 if (!IS_ERR(vol->root_ino)) 1977 iput(vol->root_ino); 1978 ntfs_error(sb, "Failed to load root directory."); 1979 goto iput_logfile_err_out; 1980 } 1981 #ifdef NTFS_RW 1982 /* 1983 * Check if Windows is suspended to disk on the target volume. If it 1984 * is hibernated, we must not write *anything* to the disk so set 1985 * NVolErrors() without setting the dirty volume flag and mount 1986 * read-only. This will prevent read-write remounting and it will also 1987 * prevent all writes. 1988 */ 1989 err = check_windows_hibernation_status(vol); 1990 if (unlikely(err)) { 1991 static const char *es1a = "Failed to determine if Windows is " 1992 "hibernated"; 1993 static const char *es1b = "Windows is hibernated"; 1994 static const char *es2 = ". Run chkdsk."; 1995 const char *es1; 1996 1997 es1 = err < 0 ? es1a : es1b; 1998 /* If a read-write mount, convert it to a read-only mount. */ 1999 if (!(sb->s_flags & MS_RDONLY)) { 2000 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 2001 ON_ERRORS_CONTINUE))) { 2002 ntfs_error(sb, "%s and neither on_errors=" 2003 "continue nor on_errors=" 2004 "remount-ro was specified%s", 2005 es1, es2); 2006 goto iput_root_err_out; 2007 } 2008 sb->s_flags |= MS_RDONLY; 2009 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 2010 } else 2011 ntfs_warning(sb, "%s. Will not be able to remount " 2012 "read-write%s", es1, es2); 2013 /* This will prevent a read-write remount. */ 2014 NVolSetErrors(vol); 2015 } 2016 /* If (still) a read-write mount, mark the volume dirty. */ 2017 if (!(sb->s_flags & MS_RDONLY) && 2018 ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) { 2019 static const char *es1 = "Failed to set dirty bit in volume " 2020 "information flags"; 2021 static const char *es2 = ". Run chkdsk."; 2022 2023 /* Convert to a read-only mount. */ 2024 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 2025 ON_ERRORS_CONTINUE))) { 2026 ntfs_error(sb, "%s and neither on_errors=continue nor " 2027 "on_errors=remount-ro was specified%s", 2028 es1, es2); 2029 goto iput_root_err_out; 2030 } 2031 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 2032 sb->s_flags |= MS_RDONLY; 2033 /* 2034 * Do not set NVolErrors() because ntfs_remount() might manage 2035 * to set the dirty flag in which case all would be well. 2036 */ 2037 } 2038 #if 0 2039 // TODO: Enable this code once we start modifying anything that is 2040 // different between NTFS 1.2 and 3.x... 2041 /* 2042 * If (still) a read-write mount, set the NT4 compatibility flag on 2043 * newer NTFS version volumes. 2044 */ 2045 if (!(sb->s_flags & MS_RDONLY) && (vol->major_ver > 1) && 2046 ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) { 2047 static const char *es1 = "Failed to set NT4 compatibility flag"; 2048 static const char *es2 = ". Run chkdsk."; 2049 2050 /* Convert to a read-only mount. */ 2051 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 2052 ON_ERRORS_CONTINUE))) { 2053 ntfs_error(sb, "%s and neither on_errors=continue nor " 2054 "on_errors=remount-ro was specified%s", 2055 es1, es2); 2056 goto iput_root_err_out; 2057 } 2058 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 2059 sb->s_flags |= MS_RDONLY; 2060 NVolSetErrors(vol); 2061 } 2062 #endif 2063 /* If (still) a read-write mount, empty the logfile. */ 2064 if (!(sb->s_flags & MS_RDONLY) && 2065 !ntfs_empty_logfile(vol->logfile_ino)) { 2066 static const char *es1 = "Failed to empty $LogFile"; 2067 static const char *es2 = ". Mount in Windows."; 2068 2069 /* Convert to a read-only mount. */ 2070 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 2071 ON_ERRORS_CONTINUE))) { 2072 ntfs_error(sb, "%s and neither on_errors=continue nor " 2073 "on_errors=remount-ro was specified%s", 2074 es1, es2); 2075 goto iput_root_err_out; 2076 } 2077 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 2078 sb->s_flags |= MS_RDONLY; 2079 NVolSetErrors(vol); 2080 } 2081 #endif /* NTFS_RW */ 2082 /* If on NTFS versions before 3.0, we are done. */ 2083 if (unlikely(vol->major_ver < 3)) 2084 return true; 2085 /* NTFS 3.0+ specific initialization. */ 2086 /* Get the security descriptors inode. */ 2087 vol->secure_ino = ntfs_iget(sb, FILE_Secure); 2088 if (IS_ERR(vol->secure_ino) || is_bad_inode(vol->secure_ino)) { 2089 if (!IS_ERR(vol->secure_ino)) 2090 iput(vol->secure_ino); 2091 ntfs_error(sb, "Failed to load $Secure."); 2092 goto iput_root_err_out; 2093 } 2094 // TODO: Initialize security. 2095 /* Get the extended system files' directory inode. */ 2096 vol->extend_ino = ntfs_iget(sb, FILE_Extend); 2097 if (IS_ERR(vol->extend_ino) || is_bad_inode(vol->extend_ino)) { 2098 if (!IS_ERR(vol->extend_ino)) 2099 iput(vol->extend_ino); 2100 ntfs_error(sb, "Failed to load $Extend."); 2101 goto iput_sec_err_out; 2102 } 2103 #ifdef NTFS_RW 2104 /* Find the quota file, load it if present, and set it up. */ 2105 if (!load_and_init_quota(vol)) { 2106 static const char *es1 = "Failed to load $Quota"; 2107 static const char *es2 = ". Run chkdsk."; 2108 2109 /* If a read-write mount, convert it to a read-only mount. */ 2110 if (!(sb->s_flags & MS_RDONLY)) { 2111 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 2112 ON_ERRORS_CONTINUE))) { 2113 ntfs_error(sb, "%s and neither on_errors=" 2114 "continue nor on_errors=" 2115 "remount-ro was specified%s", 2116 es1, es2); 2117 goto iput_quota_err_out; 2118 } 2119 sb->s_flags |= MS_RDONLY; 2120 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 2121 } else 2122 ntfs_warning(sb, "%s. Will not be able to remount " 2123 "read-write%s", es1, es2); 2124 /* This will prevent a read-write remount. */ 2125 NVolSetErrors(vol); 2126 } 2127 /* If (still) a read-write mount, mark the quotas out of date. */ 2128 if (!(sb->s_flags & MS_RDONLY) && 2129 !ntfs_mark_quotas_out_of_date(vol)) { 2130 static const char *es1 = "Failed to mark quotas out of date"; 2131 static const char *es2 = ". Run chkdsk."; 2132 2133 /* Convert to a read-only mount. */ 2134 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 2135 ON_ERRORS_CONTINUE))) { 2136 ntfs_error(sb, "%s and neither on_errors=continue nor " 2137 "on_errors=remount-ro was specified%s", 2138 es1, es2); 2139 goto iput_quota_err_out; 2140 } 2141 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 2142 sb->s_flags |= MS_RDONLY; 2143 NVolSetErrors(vol); 2144 } 2145 /* 2146 * Find the transaction log file ($UsnJrnl), load it if present, check 2147 * it, and set it up. 2148 */ 2149 if (!load_and_init_usnjrnl(vol)) { 2150 static const char *es1 = "Failed to load $UsnJrnl"; 2151 static const char *es2 = ". Run chkdsk."; 2152 2153 /* If a read-write mount, convert it to a read-only mount. */ 2154 if (!(sb->s_flags & MS_RDONLY)) { 2155 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 2156 ON_ERRORS_CONTINUE))) { 2157 ntfs_error(sb, "%s and neither on_errors=" 2158 "continue nor on_errors=" 2159 "remount-ro was specified%s", 2160 es1, es2); 2161 goto iput_usnjrnl_err_out; 2162 } 2163 sb->s_flags |= MS_RDONLY; 2164 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 2165 } else 2166 ntfs_warning(sb, "%s. Will not be able to remount " 2167 "read-write%s", es1, es2); 2168 /* This will prevent a read-write remount. */ 2169 NVolSetErrors(vol); 2170 } 2171 /* If (still) a read-write mount, stamp the transaction log. */ 2172 if (!(sb->s_flags & MS_RDONLY) && !ntfs_stamp_usnjrnl(vol)) { 2173 static const char *es1 = "Failed to stamp transaction log " 2174 "($UsnJrnl)"; 2175 static const char *es2 = ". Run chkdsk."; 2176 2177 /* Convert to a read-only mount. */ 2178 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 2179 ON_ERRORS_CONTINUE))) { 2180 ntfs_error(sb, "%s and neither on_errors=continue nor " 2181 "on_errors=remount-ro was specified%s", 2182 es1, es2); 2183 goto iput_usnjrnl_err_out; 2184 } 2185 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 2186 sb->s_flags |= MS_RDONLY; 2187 NVolSetErrors(vol); 2188 } 2189 #endif /* NTFS_RW */ 2190 return true; 2191 #ifdef NTFS_RW 2192 iput_usnjrnl_err_out: 2193 if (vol->usnjrnl_j_ino) 2194 iput(vol->usnjrnl_j_ino); 2195 if (vol->usnjrnl_max_ino) 2196 iput(vol->usnjrnl_max_ino); 2197 if (vol->usnjrnl_ino) 2198 iput(vol->usnjrnl_ino); 2199 iput_quota_err_out: 2200 if (vol->quota_q_ino) 2201 iput(vol->quota_q_ino); 2202 if (vol->quota_ino) 2203 iput(vol->quota_ino); 2204 iput(vol->extend_ino); 2205 #endif /* NTFS_RW */ 2206 iput_sec_err_out: 2207 iput(vol->secure_ino); 2208 iput_root_err_out: 2209 iput(vol->root_ino); 2210 iput_logfile_err_out: 2211 #ifdef NTFS_RW 2212 if (vol->logfile_ino) 2213 iput(vol->logfile_ino); 2214 iput_vol_err_out: 2215 #endif /* NTFS_RW */ 2216 iput(vol->vol_ino); 2217 iput_lcnbmp_err_out: 2218 iput(vol->lcnbmp_ino); 2219 iput_attrdef_err_out: 2220 vol->attrdef_size = 0; 2221 if (vol->attrdef) { 2222 ntfs_free(vol->attrdef); 2223 vol->attrdef = NULL; 2224 } 2225 #ifdef NTFS_RW 2226 iput_upcase_err_out: 2227 #endif /* NTFS_RW */ 2228 vol->upcase_len = 0; 2229 mutex_lock(&ntfs_lock); 2230 if (vol->upcase == default_upcase) { 2231 ntfs_nr_upcase_users--; 2232 vol->upcase = NULL; 2233 } 2234 mutex_unlock(&ntfs_lock); 2235 if (vol->upcase) { 2236 ntfs_free(vol->upcase); 2237 vol->upcase = NULL; 2238 } 2239 iput_mftbmp_err_out: 2240 iput(vol->mftbmp_ino); 2241 iput_mirr_err_out: 2242 #ifdef NTFS_RW 2243 if (vol->mftmirr_ino) 2244 iput(vol->mftmirr_ino); 2245 #endif /* NTFS_RW */ 2246 return false; 2247 } 2248 2249 /** 2250 * ntfs_put_super - called by the vfs to unmount a volume 2251 * @sb: vfs superblock of volume to unmount 2252 * 2253 * ntfs_put_super() is called by the VFS (from fs/super.c::do_umount()) when 2254 * the volume is being unmounted (umount system call has been invoked) and it 2255 * releases all inodes and memory belonging to the NTFS specific part of the 2256 * super block. 2257 */ 2258 static void ntfs_put_super(struct super_block *sb) 2259 { 2260 ntfs_volume *vol = NTFS_SB(sb); 2261 2262 ntfs_debug("Entering."); 2263 2264 lock_kernel(); 2265 2266 #ifdef NTFS_RW 2267 /* 2268 * Commit all inodes while they are still open in case some of them 2269 * cause others to be dirtied. 2270 */ 2271 ntfs_commit_inode(vol->vol_ino); 2272 2273 /* NTFS 3.0+ specific. */ 2274 if (vol->major_ver >= 3) { 2275 if (vol->usnjrnl_j_ino) 2276 ntfs_commit_inode(vol->usnjrnl_j_ino); 2277 if (vol->usnjrnl_max_ino) 2278 ntfs_commit_inode(vol->usnjrnl_max_ino); 2279 if (vol->usnjrnl_ino) 2280 ntfs_commit_inode(vol->usnjrnl_ino); 2281 if (vol->quota_q_ino) 2282 ntfs_commit_inode(vol->quota_q_ino); 2283 if (vol->quota_ino) 2284 ntfs_commit_inode(vol->quota_ino); 2285 if (vol->extend_ino) 2286 ntfs_commit_inode(vol->extend_ino); 2287 if (vol->secure_ino) 2288 ntfs_commit_inode(vol->secure_ino); 2289 } 2290 2291 ntfs_commit_inode(vol->root_ino); 2292 2293 down_write(&vol->lcnbmp_lock); 2294 ntfs_commit_inode(vol->lcnbmp_ino); 2295 up_write(&vol->lcnbmp_lock); 2296 2297 down_write(&vol->mftbmp_lock); 2298 ntfs_commit_inode(vol->mftbmp_ino); 2299 up_write(&vol->mftbmp_lock); 2300 2301 if (vol->logfile_ino) 2302 ntfs_commit_inode(vol->logfile_ino); 2303 2304 if (vol->mftmirr_ino) 2305 ntfs_commit_inode(vol->mftmirr_ino); 2306 ntfs_commit_inode(vol->mft_ino); 2307 2308 /* 2309 * If a read-write mount and no volume errors have occured, mark the 2310 * volume clean. Also, re-commit all affected inodes. 2311 */ 2312 if (!(sb->s_flags & MS_RDONLY)) { 2313 if (!NVolErrors(vol)) { 2314 if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY)) 2315 ntfs_warning(sb, "Failed to clear dirty bit " 2316 "in volume information " 2317 "flags. Run chkdsk."); 2318 ntfs_commit_inode(vol->vol_ino); 2319 ntfs_commit_inode(vol->root_ino); 2320 if (vol->mftmirr_ino) 2321 ntfs_commit_inode(vol->mftmirr_ino); 2322 ntfs_commit_inode(vol->mft_ino); 2323 } else { 2324 ntfs_warning(sb, "Volume has errors. Leaving volume " 2325 "marked dirty. Run chkdsk."); 2326 } 2327 } 2328 #endif /* NTFS_RW */ 2329 2330 iput(vol->vol_ino); 2331 vol->vol_ino = NULL; 2332 2333 /* NTFS 3.0+ specific clean up. */ 2334 if (vol->major_ver >= 3) { 2335 #ifdef NTFS_RW 2336 if (vol->usnjrnl_j_ino) { 2337 iput(vol->usnjrnl_j_ino); 2338 vol->usnjrnl_j_ino = NULL; 2339 } 2340 if (vol->usnjrnl_max_ino) { 2341 iput(vol->usnjrnl_max_ino); 2342 vol->usnjrnl_max_ino = NULL; 2343 } 2344 if (vol->usnjrnl_ino) { 2345 iput(vol->usnjrnl_ino); 2346 vol->usnjrnl_ino = NULL; 2347 } 2348 if (vol->quota_q_ino) { 2349 iput(vol->quota_q_ino); 2350 vol->quota_q_ino = NULL; 2351 } 2352 if (vol->quota_ino) { 2353 iput(vol->quota_ino); 2354 vol->quota_ino = NULL; 2355 } 2356 #endif /* NTFS_RW */ 2357 if (vol->extend_ino) { 2358 iput(vol->extend_ino); 2359 vol->extend_ino = NULL; 2360 } 2361 if (vol->secure_ino) { 2362 iput(vol->secure_ino); 2363 vol->secure_ino = NULL; 2364 } 2365 } 2366 2367 iput(vol->root_ino); 2368 vol->root_ino = NULL; 2369 2370 down_write(&vol->lcnbmp_lock); 2371 iput(vol->lcnbmp_ino); 2372 vol->lcnbmp_ino = NULL; 2373 up_write(&vol->lcnbmp_lock); 2374 2375 down_write(&vol->mftbmp_lock); 2376 iput(vol->mftbmp_ino); 2377 vol->mftbmp_ino = NULL; 2378 up_write(&vol->mftbmp_lock); 2379 2380 #ifdef NTFS_RW 2381 if (vol->logfile_ino) { 2382 iput(vol->logfile_ino); 2383 vol->logfile_ino = NULL; 2384 } 2385 if (vol->mftmirr_ino) { 2386 /* Re-commit the mft mirror and mft just in case. */ 2387 ntfs_commit_inode(vol->mftmirr_ino); 2388 ntfs_commit_inode(vol->mft_ino); 2389 iput(vol->mftmirr_ino); 2390 vol->mftmirr_ino = NULL; 2391 } 2392 /* 2393 * We should have no dirty inodes left, due to 2394 * mft.c::ntfs_mft_writepage() cleaning all the dirty pages as 2395 * the underlying mft records are written out and cleaned. 2396 */ 2397 ntfs_commit_inode(vol->mft_ino); 2398 write_inode_now(vol->mft_ino, 1); 2399 #endif /* NTFS_RW */ 2400 2401 iput(vol->mft_ino); 2402 vol->mft_ino = NULL; 2403 2404 /* Throw away the table of attribute definitions. */ 2405 vol->attrdef_size = 0; 2406 if (vol->attrdef) { 2407 ntfs_free(vol->attrdef); 2408 vol->attrdef = NULL; 2409 } 2410 vol->upcase_len = 0; 2411 /* 2412 * Destroy the global default upcase table if necessary. Also decrease 2413 * the number of upcase users if we are a user. 2414 */ 2415 mutex_lock(&ntfs_lock); 2416 if (vol->upcase == default_upcase) { 2417 ntfs_nr_upcase_users--; 2418 vol->upcase = NULL; 2419 } 2420 if (!ntfs_nr_upcase_users && default_upcase) { 2421 ntfs_free(default_upcase); 2422 default_upcase = NULL; 2423 } 2424 if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users) 2425 free_compression_buffers(); 2426 mutex_unlock(&ntfs_lock); 2427 if (vol->upcase) { 2428 ntfs_free(vol->upcase); 2429 vol->upcase = NULL; 2430 } 2431 2432 unload_nls(vol->nls_map); 2433 2434 sb->s_fs_info = NULL; 2435 kfree(vol); 2436 2437 unlock_kernel(); 2438 } 2439 2440 /** 2441 * get_nr_free_clusters - return the number of free clusters on a volume 2442 * @vol: ntfs volume for which to obtain free cluster count 2443 * 2444 * Calculate the number of free clusters on the mounted NTFS volume @vol. We 2445 * actually calculate the number of clusters in use instead because this 2446 * allows us to not care about partial pages as these will be just zero filled 2447 * and hence not be counted as allocated clusters. 2448 * 2449 * The only particularity is that clusters beyond the end of the logical ntfs 2450 * volume will be marked as allocated to prevent errors which means we have to 2451 * discount those at the end. This is important as the cluster bitmap always 2452 * has a size in multiples of 8 bytes, i.e. up to 63 clusters could be outside 2453 * the logical volume and marked in use when they are not as they do not exist. 2454 * 2455 * If any pages cannot be read we assume all clusters in the erroring pages are 2456 * in use. This means we return an underestimate on errors which is better than 2457 * an overestimate. 2458 */ 2459 static s64 get_nr_free_clusters(ntfs_volume *vol) 2460 { 2461 s64 nr_free = vol->nr_clusters; 2462 struct address_space *mapping = vol->lcnbmp_ino->i_mapping; 2463 struct page *page; 2464 pgoff_t index, max_index; 2465 2466 ntfs_debug("Entering."); 2467 /* Serialize accesses to the cluster bitmap. */ 2468 down_read(&vol->lcnbmp_lock); 2469 /* 2470 * Convert the number of bits into bytes rounded up, then convert into 2471 * multiples of PAGE_CACHE_SIZE, rounding up so that if we have one 2472 * full and one partial page max_index = 2. 2473 */ 2474 max_index = (((vol->nr_clusters + 7) >> 3) + PAGE_CACHE_SIZE - 1) >> 2475 PAGE_CACHE_SHIFT; 2476 /* Use multiples of 4 bytes, thus max_size is PAGE_CACHE_SIZE / 4. */ 2477 ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%lx.", 2478 max_index, PAGE_CACHE_SIZE / 4); 2479 for (index = 0; index < max_index; index++) { 2480 unsigned long *kaddr; 2481 2482 /* 2483 * Read the page from page cache, getting it from backing store 2484 * if necessary, and increment the use count. 2485 */ 2486 page = read_mapping_page(mapping, index, NULL); 2487 /* Ignore pages which errored synchronously. */ 2488 if (IS_ERR(page)) { 2489 ntfs_debug("read_mapping_page() error. Skipping " 2490 "page (index 0x%lx).", index); 2491 nr_free -= PAGE_CACHE_SIZE * 8; 2492 continue; 2493 } 2494 kaddr = kmap_atomic(page, KM_USER0); 2495 /* 2496 * Subtract the number of set bits. If this 2497 * is the last page and it is partial we don't really care as 2498 * it just means we do a little extra work but it won't affect 2499 * the result as all out of range bytes are set to zero by 2500 * ntfs_readpage(). 2501 */ 2502 nr_free -= bitmap_weight(kaddr, 2503 PAGE_CACHE_SIZE * BITS_PER_BYTE); 2504 kunmap_atomic(kaddr, KM_USER0); 2505 page_cache_release(page); 2506 } 2507 ntfs_debug("Finished reading $Bitmap, last index = 0x%lx.", index - 1); 2508 /* 2509 * Fixup for eventual bits outside logical ntfs volume (see function 2510 * description above). 2511 */ 2512 if (vol->nr_clusters & 63) 2513 nr_free += 64 - (vol->nr_clusters & 63); 2514 up_read(&vol->lcnbmp_lock); 2515 /* If errors occured we may well have gone below zero, fix this. */ 2516 if (nr_free < 0) 2517 nr_free = 0; 2518 ntfs_debug("Exiting."); 2519 return nr_free; 2520 } 2521 2522 /** 2523 * __get_nr_free_mft_records - return the number of free inodes on a volume 2524 * @vol: ntfs volume for which to obtain free inode count 2525 * @nr_free: number of mft records in filesystem 2526 * @max_index: maximum number of pages containing set bits 2527 * 2528 * Calculate the number of free mft records (inodes) on the mounted NTFS 2529 * volume @vol. We actually calculate the number of mft records in use instead 2530 * because this allows us to not care about partial pages as these will be just 2531 * zero filled and hence not be counted as allocated mft record. 2532 * 2533 * If any pages cannot be read we assume all mft records in the erroring pages 2534 * are in use. This means we return an underestimate on errors which is better 2535 * than an overestimate. 2536 * 2537 * NOTE: Caller must hold mftbmp_lock rw_semaphore for reading or writing. 2538 */ 2539 static unsigned long __get_nr_free_mft_records(ntfs_volume *vol, 2540 s64 nr_free, const pgoff_t max_index) 2541 { 2542 struct address_space *mapping = vol->mftbmp_ino->i_mapping; 2543 struct page *page; 2544 pgoff_t index; 2545 2546 ntfs_debug("Entering."); 2547 /* Use multiples of 4 bytes, thus max_size is PAGE_CACHE_SIZE / 4. */ 2548 ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = " 2549 "0x%lx.", max_index, PAGE_CACHE_SIZE / 4); 2550 for (index = 0; index < max_index; index++) { 2551 unsigned long *kaddr; 2552 2553 /* 2554 * Read the page from page cache, getting it from backing store 2555 * if necessary, and increment the use count. 2556 */ 2557 page = read_mapping_page(mapping, index, NULL); 2558 /* Ignore pages which errored synchronously. */ 2559 if (IS_ERR(page)) { 2560 ntfs_debug("read_mapping_page() error. Skipping " 2561 "page (index 0x%lx).", index); 2562 nr_free -= PAGE_CACHE_SIZE * 8; 2563 continue; 2564 } 2565 kaddr = kmap_atomic(page, KM_USER0); 2566 /* 2567 * Subtract the number of set bits. If this 2568 * is the last page and it is partial we don't really care as 2569 * it just means we do a little extra work but it won't affect 2570 * the result as all out of range bytes are set to zero by 2571 * ntfs_readpage(). 2572 */ 2573 nr_free -= bitmap_weight(kaddr, 2574 PAGE_CACHE_SIZE * BITS_PER_BYTE); 2575 kunmap_atomic(kaddr, KM_USER0); 2576 page_cache_release(page); 2577 } 2578 ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx.", 2579 index - 1); 2580 /* If errors occured we may well have gone below zero, fix this. */ 2581 if (nr_free < 0) 2582 nr_free = 0; 2583 ntfs_debug("Exiting."); 2584 return nr_free; 2585 } 2586 2587 /** 2588 * ntfs_statfs - return information about mounted NTFS volume 2589 * @dentry: dentry from mounted volume 2590 * @sfs: statfs structure in which to return the information 2591 * 2592 * Return information about the mounted NTFS volume @dentry in the statfs structure 2593 * pointed to by @sfs (this is initialized with zeros before ntfs_statfs is 2594 * called). We interpret the values to be correct of the moment in time at 2595 * which we are called. Most values are variable otherwise and this isn't just 2596 * the free values but the totals as well. For example we can increase the 2597 * total number of file nodes if we run out and we can keep doing this until 2598 * there is no more space on the volume left at all. 2599 * 2600 * Called from vfs_statfs which is used to handle the statfs, fstatfs, and 2601 * ustat system calls. 2602 * 2603 * Return 0 on success or -errno on error. 2604 */ 2605 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *sfs) 2606 { 2607 struct super_block *sb = dentry->d_sb; 2608 s64 size; 2609 ntfs_volume *vol = NTFS_SB(sb); 2610 ntfs_inode *mft_ni = NTFS_I(vol->mft_ino); 2611 pgoff_t max_index; 2612 unsigned long flags; 2613 2614 ntfs_debug("Entering."); 2615 /* Type of filesystem. */ 2616 sfs->f_type = NTFS_SB_MAGIC; 2617 /* Optimal transfer block size. */ 2618 sfs->f_bsize = PAGE_CACHE_SIZE; 2619 /* 2620 * Total data blocks in filesystem in units of f_bsize and since 2621 * inodes are also stored in data blocs ($MFT is a file) this is just 2622 * the total clusters. 2623 */ 2624 sfs->f_blocks = vol->nr_clusters << vol->cluster_size_bits >> 2625 PAGE_CACHE_SHIFT; 2626 /* Free data blocks in filesystem in units of f_bsize. */ 2627 size = get_nr_free_clusters(vol) << vol->cluster_size_bits >> 2628 PAGE_CACHE_SHIFT; 2629 if (size < 0LL) 2630 size = 0LL; 2631 /* Free blocks avail to non-superuser, same as above on NTFS. */ 2632 sfs->f_bavail = sfs->f_bfree = size; 2633 /* Serialize accesses to the inode bitmap. */ 2634 down_read(&vol->mftbmp_lock); 2635 read_lock_irqsave(&mft_ni->size_lock, flags); 2636 size = i_size_read(vol->mft_ino) >> vol->mft_record_size_bits; 2637 /* 2638 * Convert the maximum number of set bits into bytes rounded up, then 2639 * convert into multiples of PAGE_CACHE_SIZE, rounding up so that if we 2640 * have one full and one partial page max_index = 2. 2641 */ 2642 max_index = ((((mft_ni->initialized_size >> vol->mft_record_size_bits) 2643 + 7) >> 3) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 2644 read_unlock_irqrestore(&mft_ni->size_lock, flags); 2645 /* Number of inodes in filesystem (at this point in time). */ 2646 sfs->f_files = size; 2647 /* Free inodes in fs (based on current total count). */ 2648 sfs->f_ffree = __get_nr_free_mft_records(vol, size, max_index); 2649 up_read(&vol->mftbmp_lock); 2650 /* 2651 * File system id. This is extremely *nix flavour dependent and even 2652 * within Linux itself all fs do their own thing. I interpret this to 2653 * mean a unique id associated with the mounted fs and not the id 2654 * associated with the filesystem driver, the latter is already given 2655 * by the filesystem type in sfs->f_type. Thus we use the 64-bit 2656 * volume serial number splitting it into two 32-bit parts. We enter 2657 * the least significant 32-bits in f_fsid[0] and the most significant 2658 * 32-bits in f_fsid[1]. 2659 */ 2660 sfs->f_fsid.val[0] = vol->serial_no & 0xffffffff; 2661 sfs->f_fsid.val[1] = (vol->serial_no >> 32) & 0xffffffff; 2662 /* Maximum length of filenames. */ 2663 sfs->f_namelen = NTFS_MAX_NAME_LEN; 2664 return 0; 2665 } 2666 2667 #ifdef NTFS_RW 2668 static int ntfs_write_inode(struct inode *vi, struct writeback_control *wbc) 2669 { 2670 return __ntfs_write_inode(vi, wbc->sync_mode == WB_SYNC_ALL); 2671 } 2672 #endif 2673 2674 /** 2675 * The complete super operations. 2676 */ 2677 static const struct super_operations ntfs_sops = { 2678 .alloc_inode = ntfs_alloc_big_inode, /* VFS: Allocate new inode. */ 2679 .destroy_inode = ntfs_destroy_big_inode, /* VFS: Deallocate inode. */ 2680 #ifdef NTFS_RW 2681 //.dirty_inode = NULL, /* VFS: Called from 2682 // __mark_inode_dirty(). */ 2683 .write_inode = ntfs_write_inode, /* VFS: Write dirty inode to 2684 disk. */ 2685 //.drop_inode = NULL, /* VFS: Called just after the 2686 // inode reference count has 2687 // been decreased to zero. 2688 // NOTE: The inode lock is 2689 // held. See fs/inode.c:: 2690 // generic_drop_inode(). */ 2691 //.delete_inode = NULL, /* VFS: Delete inode from disk. 2692 // Called when i_count becomes 2693 // 0 and i_nlink is also 0. */ 2694 //.write_super = NULL, /* Flush dirty super block to 2695 // disk. */ 2696 //.sync_fs = NULL, /* ? */ 2697 //.write_super_lockfs = NULL, /* ? */ 2698 //.unlockfs = NULL, /* ? */ 2699 #endif /* NTFS_RW */ 2700 .put_super = ntfs_put_super, /* Syscall: umount. */ 2701 .statfs = ntfs_statfs, /* Syscall: statfs */ 2702 .remount_fs = ntfs_remount, /* Syscall: mount -o remount. */ 2703 .clear_inode = ntfs_clear_big_inode, /* VFS: Called when an inode is 2704 removed from memory. */ 2705 //.umount_begin = NULL, /* Forced umount. */ 2706 .show_options = ntfs_show_options, /* Show mount options in 2707 proc. */ 2708 }; 2709 2710 /** 2711 * ntfs_fill_super - mount an ntfs filesystem 2712 * @sb: super block of ntfs filesystem to mount 2713 * @opt: string containing the mount options 2714 * @silent: silence error output 2715 * 2716 * ntfs_fill_super() is called by the VFS to mount the device described by @sb 2717 * with the mount otions in @data with the NTFS filesystem. 2718 * 2719 * If @silent is true, remain silent even if errors are detected. This is used 2720 * during bootup, when the kernel tries to mount the root filesystem with all 2721 * registered filesystems one after the other until one succeeds. This implies 2722 * that all filesystems except the correct one will quite correctly and 2723 * expectedly return an error, but nobody wants to see error messages when in 2724 * fact this is what is supposed to happen. 2725 * 2726 * NOTE: @sb->s_flags contains the mount options flags. 2727 */ 2728 static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent) 2729 { 2730 ntfs_volume *vol; 2731 struct buffer_head *bh; 2732 struct inode *tmp_ino; 2733 int blocksize, result; 2734 2735 /* 2736 * We do a pretty difficult piece of bootstrap by reading the 2737 * MFT (and other metadata) from disk into memory. We'll only 2738 * release this metadata during umount, so the locking patterns 2739 * observed during bootstrap do not count. So turn off the 2740 * observation of locking patterns (strictly for this context 2741 * only) while mounting NTFS. [The validator is still active 2742 * otherwise, even for this context: it will for example record 2743 * lock class registrations.] 2744 */ 2745 lockdep_off(); 2746 ntfs_debug("Entering."); 2747 #ifndef NTFS_RW 2748 sb->s_flags |= MS_RDONLY; 2749 #endif /* ! NTFS_RW */ 2750 /* Allocate a new ntfs_volume and place it in sb->s_fs_info. */ 2751 sb->s_fs_info = kmalloc(sizeof(ntfs_volume), GFP_NOFS); 2752 vol = NTFS_SB(sb); 2753 if (!vol) { 2754 if (!silent) 2755 ntfs_error(sb, "Allocation of NTFS volume structure " 2756 "failed. Aborting mount..."); 2757 lockdep_on(); 2758 return -ENOMEM; 2759 } 2760 /* Initialize ntfs_volume structure. */ 2761 *vol = (ntfs_volume) { 2762 .sb = sb, 2763 /* 2764 * Default is group and other don't have any access to files or 2765 * directories while owner has full access. Further, files by 2766 * default are not executable but directories are of course 2767 * browseable. 2768 */ 2769 .fmask = 0177, 2770 .dmask = 0077, 2771 }; 2772 init_rwsem(&vol->mftbmp_lock); 2773 init_rwsem(&vol->lcnbmp_lock); 2774 2775 unlock_kernel(); 2776 2777 /* By default, enable sparse support. */ 2778 NVolSetSparseEnabled(vol); 2779 2780 /* Important to get the mount options dealt with now. */ 2781 if (!parse_options(vol, (char*)opt)) 2782 goto err_out_now; 2783 2784 /* We support sector sizes up to the PAGE_CACHE_SIZE. */ 2785 if (bdev_logical_block_size(sb->s_bdev) > PAGE_CACHE_SIZE) { 2786 if (!silent) 2787 ntfs_error(sb, "Device has unsupported sector size " 2788 "(%i). The maximum supported sector " 2789 "size on this architecture is %lu " 2790 "bytes.", 2791 bdev_logical_block_size(sb->s_bdev), 2792 PAGE_CACHE_SIZE); 2793 goto err_out_now; 2794 } 2795 /* 2796 * Setup the device access block size to NTFS_BLOCK_SIZE or the hard 2797 * sector size, whichever is bigger. 2798 */ 2799 blocksize = sb_min_blocksize(sb, NTFS_BLOCK_SIZE); 2800 if (blocksize < NTFS_BLOCK_SIZE) { 2801 if (!silent) 2802 ntfs_error(sb, "Unable to set device block size."); 2803 goto err_out_now; 2804 } 2805 BUG_ON(blocksize != sb->s_blocksize); 2806 ntfs_debug("Set device block size to %i bytes (block size bits %i).", 2807 blocksize, sb->s_blocksize_bits); 2808 /* Determine the size of the device in units of block_size bytes. */ 2809 if (!i_size_read(sb->s_bdev->bd_inode)) { 2810 if (!silent) 2811 ntfs_error(sb, "Unable to determine device size."); 2812 goto err_out_now; 2813 } 2814 vol->nr_blocks = i_size_read(sb->s_bdev->bd_inode) >> 2815 sb->s_blocksize_bits; 2816 /* Read the boot sector and return unlocked buffer head to it. */ 2817 if (!(bh = read_ntfs_boot_sector(sb, silent))) { 2818 if (!silent) 2819 ntfs_error(sb, "Not an NTFS volume."); 2820 goto err_out_now; 2821 } 2822 /* 2823 * Extract the data from the boot sector and setup the ntfs volume 2824 * using it. 2825 */ 2826 result = parse_ntfs_boot_sector(vol, (NTFS_BOOT_SECTOR*)bh->b_data); 2827 brelse(bh); 2828 if (!result) { 2829 if (!silent) 2830 ntfs_error(sb, "Unsupported NTFS filesystem."); 2831 goto err_out_now; 2832 } 2833 /* 2834 * If the boot sector indicates a sector size bigger than the current 2835 * device block size, switch the device block size to the sector size. 2836 * TODO: It may be possible to support this case even when the set 2837 * below fails, we would just be breaking up the i/o for each sector 2838 * into multiple blocks for i/o purposes but otherwise it should just 2839 * work. However it is safer to leave disabled until someone hits this 2840 * error message and then we can get them to try it without the setting 2841 * so we know for sure that it works. 2842 */ 2843 if (vol->sector_size > blocksize) { 2844 blocksize = sb_set_blocksize(sb, vol->sector_size); 2845 if (blocksize != vol->sector_size) { 2846 if (!silent) 2847 ntfs_error(sb, "Unable to set device block " 2848 "size to sector size (%i).", 2849 vol->sector_size); 2850 goto err_out_now; 2851 } 2852 BUG_ON(blocksize != sb->s_blocksize); 2853 vol->nr_blocks = i_size_read(sb->s_bdev->bd_inode) >> 2854 sb->s_blocksize_bits; 2855 ntfs_debug("Changed device block size to %i bytes (block size " 2856 "bits %i) to match volume sector size.", 2857 blocksize, sb->s_blocksize_bits); 2858 } 2859 /* Initialize the cluster and mft allocators. */ 2860 ntfs_setup_allocators(vol); 2861 /* Setup remaining fields in the super block. */ 2862 sb->s_magic = NTFS_SB_MAGIC; 2863 /* 2864 * Ntfs allows 63 bits for the file size, i.e. correct would be: 2865 * sb->s_maxbytes = ~0ULL >> 1; 2866 * But the kernel uses a long as the page cache page index which on 2867 * 32-bit architectures is only 32-bits. MAX_LFS_FILESIZE is kernel 2868 * defined to the maximum the page cache page index can cope with 2869 * without overflowing the index or to 2^63 - 1, whichever is smaller. 2870 */ 2871 sb->s_maxbytes = MAX_LFS_FILESIZE; 2872 /* Ntfs measures time in 100ns intervals. */ 2873 sb->s_time_gran = 100; 2874 /* 2875 * Now load the metadata required for the page cache and our address 2876 * space operations to function. We do this by setting up a specialised 2877 * read_inode method and then just calling the normal iget() to obtain 2878 * the inode for $MFT which is sufficient to allow our normal inode 2879 * operations and associated address space operations to function. 2880 */ 2881 sb->s_op = &ntfs_sops; 2882 tmp_ino = new_inode(sb); 2883 if (!tmp_ino) { 2884 if (!silent) 2885 ntfs_error(sb, "Failed to load essential metadata."); 2886 goto err_out_now; 2887 } 2888 tmp_ino->i_ino = FILE_MFT; 2889 insert_inode_hash(tmp_ino); 2890 if (ntfs_read_inode_mount(tmp_ino) < 0) { 2891 if (!silent) 2892 ntfs_error(sb, "Failed to load essential metadata."); 2893 goto iput_tmp_ino_err_out_now; 2894 } 2895 mutex_lock(&ntfs_lock); 2896 /* 2897 * The current mount is a compression user if the cluster size is 2898 * less than or equal 4kiB. 2899 */ 2900 if (vol->cluster_size <= 4096 && !ntfs_nr_compression_users++) { 2901 result = allocate_compression_buffers(); 2902 if (result) { 2903 ntfs_error(NULL, "Failed to allocate buffers " 2904 "for compression engine."); 2905 ntfs_nr_compression_users--; 2906 mutex_unlock(&ntfs_lock); 2907 goto iput_tmp_ino_err_out_now; 2908 } 2909 } 2910 /* 2911 * Generate the global default upcase table if necessary. Also 2912 * temporarily increment the number of upcase users to avoid race 2913 * conditions with concurrent (u)mounts. 2914 */ 2915 if (!default_upcase) 2916 default_upcase = generate_default_upcase(); 2917 ntfs_nr_upcase_users++; 2918 mutex_unlock(&ntfs_lock); 2919 /* 2920 * From now on, ignore @silent parameter. If we fail below this line, 2921 * it will be due to a corrupt fs or a system error, so we report it. 2922 */ 2923 /* 2924 * Open the system files with normal access functions and complete 2925 * setting up the ntfs super block. 2926 */ 2927 if (!load_system_files(vol)) { 2928 ntfs_error(sb, "Failed to load system files."); 2929 goto unl_upcase_iput_tmp_ino_err_out_now; 2930 } 2931 if ((sb->s_root = d_alloc_root(vol->root_ino))) { 2932 /* We increment i_count simulating an ntfs_iget(). */ 2933 atomic_inc(&vol->root_ino->i_count); 2934 ntfs_debug("Exiting, status successful."); 2935 /* Release the default upcase if it has no users. */ 2936 mutex_lock(&ntfs_lock); 2937 if (!--ntfs_nr_upcase_users && default_upcase) { 2938 ntfs_free(default_upcase); 2939 default_upcase = NULL; 2940 } 2941 mutex_unlock(&ntfs_lock); 2942 sb->s_export_op = &ntfs_export_ops; 2943 lock_kernel(); 2944 lockdep_on(); 2945 return 0; 2946 } 2947 ntfs_error(sb, "Failed to allocate root directory."); 2948 /* Clean up after the successful load_system_files() call from above. */ 2949 // TODO: Use ntfs_put_super() instead of repeating all this code... 2950 // FIXME: Should mark the volume clean as the error is most likely 2951 // -ENOMEM. 2952 iput(vol->vol_ino); 2953 vol->vol_ino = NULL; 2954 /* NTFS 3.0+ specific clean up. */ 2955 if (vol->major_ver >= 3) { 2956 #ifdef NTFS_RW 2957 if (vol->usnjrnl_j_ino) { 2958 iput(vol->usnjrnl_j_ino); 2959 vol->usnjrnl_j_ino = NULL; 2960 } 2961 if (vol->usnjrnl_max_ino) { 2962 iput(vol->usnjrnl_max_ino); 2963 vol->usnjrnl_max_ino = NULL; 2964 } 2965 if (vol->usnjrnl_ino) { 2966 iput(vol->usnjrnl_ino); 2967 vol->usnjrnl_ino = NULL; 2968 } 2969 if (vol->quota_q_ino) { 2970 iput(vol->quota_q_ino); 2971 vol->quota_q_ino = NULL; 2972 } 2973 if (vol->quota_ino) { 2974 iput(vol->quota_ino); 2975 vol->quota_ino = NULL; 2976 } 2977 #endif /* NTFS_RW */ 2978 if (vol->extend_ino) { 2979 iput(vol->extend_ino); 2980 vol->extend_ino = NULL; 2981 } 2982 if (vol->secure_ino) { 2983 iput(vol->secure_ino); 2984 vol->secure_ino = NULL; 2985 } 2986 } 2987 iput(vol->root_ino); 2988 vol->root_ino = NULL; 2989 iput(vol->lcnbmp_ino); 2990 vol->lcnbmp_ino = NULL; 2991 iput(vol->mftbmp_ino); 2992 vol->mftbmp_ino = NULL; 2993 #ifdef NTFS_RW 2994 if (vol->logfile_ino) { 2995 iput(vol->logfile_ino); 2996 vol->logfile_ino = NULL; 2997 } 2998 if (vol->mftmirr_ino) { 2999 iput(vol->mftmirr_ino); 3000 vol->mftmirr_ino = NULL; 3001 } 3002 #endif /* NTFS_RW */ 3003 /* Throw away the table of attribute definitions. */ 3004 vol->attrdef_size = 0; 3005 if (vol->attrdef) { 3006 ntfs_free(vol->attrdef); 3007 vol->attrdef = NULL; 3008 } 3009 vol->upcase_len = 0; 3010 mutex_lock(&ntfs_lock); 3011 if (vol->upcase == default_upcase) { 3012 ntfs_nr_upcase_users--; 3013 vol->upcase = NULL; 3014 } 3015 mutex_unlock(&ntfs_lock); 3016 if (vol->upcase) { 3017 ntfs_free(vol->upcase); 3018 vol->upcase = NULL; 3019 } 3020 if (vol->nls_map) { 3021 unload_nls(vol->nls_map); 3022 vol->nls_map = NULL; 3023 } 3024 /* Error exit code path. */ 3025 unl_upcase_iput_tmp_ino_err_out_now: 3026 /* 3027 * Decrease the number of upcase users and destroy the global default 3028 * upcase table if necessary. 3029 */ 3030 mutex_lock(&ntfs_lock); 3031 if (!--ntfs_nr_upcase_users && default_upcase) { 3032 ntfs_free(default_upcase); 3033 default_upcase = NULL; 3034 } 3035 if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users) 3036 free_compression_buffers(); 3037 mutex_unlock(&ntfs_lock); 3038 iput_tmp_ino_err_out_now: 3039 iput(tmp_ino); 3040 if (vol->mft_ino && vol->mft_ino != tmp_ino) 3041 iput(vol->mft_ino); 3042 vol->mft_ino = NULL; 3043 /* 3044 * This is needed to get ntfs_clear_extent_inode() called for each 3045 * inode we have ever called ntfs_iget()/iput() on, otherwise we A) 3046 * leak resources and B) a subsequent mount fails automatically due to 3047 * ntfs_iget() never calling down into our ntfs_read_locked_inode() 3048 * method again... FIXME: Do we need to do this twice now because of 3049 * attribute inodes? I think not, so leave as is for now... (AIA) 3050 */ 3051 if (invalidate_inodes(sb)) { 3052 ntfs_error(sb, "Busy inodes left. This is most likely a NTFS " 3053 "driver bug."); 3054 /* Copied from fs/super.c. I just love this message. (-; */ 3055 printk("NTFS: Busy inodes after umount. Self-destruct in 5 " 3056 "seconds. Have a nice day...\n"); 3057 } 3058 /* Errors at this stage are irrelevant. */ 3059 err_out_now: 3060 lock_kernel(); 3061 sb->s_fs_info = NULL; 3062 kfree(vol); 3063 ntfs_debug("Failed, returning -EINVAL."); 3064 lockdep_on(); 3065 return -EINVAL; 3066 } 3067 3068 /* 3069 * This is a slab cache to optimize allocations and deallocations of Unicode 3070 * strings of the maximum length allowed by NTFS, which is NTFS_MAX_NAME_LEN 3071 * (255) Unicode characters + a terminating NULL Unicode character. 3072 */ 3073 struct kmem_cache *ntfs_name_cache; 3074 3075 /* Slab caches for efficient allocation/deallocation of inodes. */ 3076 struct kmem_cache *ntfs_inode_cache; 3077 struct kmem_cache *ntfs_big_inode_cache; 3078 3079 /* Init once constructor for the inode slab cache. */ 3080 static void ntfs_big_inode_init_once(void *foo) 3081 { 3082 ntfs_inode *ni = (ntfs_inode *)foo; 3083 3084 inode_init_once(VFS_I(ni)); 3085 } 3086 3087 /* 3088 * Slab caches to optimize allocations and deallocations of attribute search 3089 * contexts and index contexts, respectively. 3090 */ 3091 struct kmem_cache *ntfs_attr_ctx_cache; 3092 struct kmem_cache *ntfs_index_ctx_cache; 3093 3094 /* Driver wide mutex. */ 3095 DEFINE_MUTEX(ntfs_lock); 3096 3097 static int ntfs_get_sb(struct file_system_type *fs_type, 3098 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 3099 { 3100 return get_sb_bdev(fs_type, flags, dev_name, data, ntfs_fill_super, 3101 mnt); 3102 } 3103 3104 static struct file_system_type ntfs_fs_type = { 3105 .owner = THIS_MODULE, 3106 .name = "ntfs", 3107 .get_sb = ntfs_get_sb, 3108 .kill_sb = kill_block_super, 3109 .fs_flags = FS_REQUIRES_DEV, 3110 }; 3111 3112 /* Stable names for the slab caches. */ 3113 static const char ntfs_index_ctx_cache_name[] = "ntfs_index_ctx_cache"; 3114 static const char ntfs_attr_ctx_cache_name[] = "ntfs_attr_ctx_cache"; 3115 static const char ntfs_name_cache_name[] = "ntfs_name_cache"; 3116 static const char ntfs_inode_cache_name[] = "ntfs_inode_cache"; 3117 static const char ntfs_big_inode_cache_name[] = "ntfs_big_inode_cache"; 3118 3119 static int __init init_ntfs_fs(void) 3120 { 3121 int err = 0; 3122 3123 /* This may be ugly but it results in pretty output so who cares. (-8 */ 3124 printk(KERN_INFO "NTFS driver " NTFS_VERSION " [Flags: R/" 3125 #ifdef NTFS_RW 3126 "W" 3127 #else 3128 "O" 3129 #endif 3130 #ifdef DEBUG 3131 " DEBUG" 3132 #endif 3133 #ifdef MODULE 3134 " MODULE" 3135 #endif 3136 "].\n"); 3137 3138 ntfs_debug("Debug messages are enabled."); 3139 3140 ntfs_index_ctx_cache = kmem_cache_create(ntfs_index_ctx_cache_name, 3141 sizeof(ntfs_index_context), 0 /* offset */, 3142 SLAB_HWCACHE_ALIGN, NULL /* ctor */); 3143 if (!ntfs_index_ctx_cache) { 3144 printk(KERN_CRIT "NTFS: Failed to create %s!\n", 3145 ntfs_index_ctx_cache_name); 3146 goto ictx_err_out; 3147 } 3148 ntfs_attr_ctx_cache = kmem_cache_create(ntfs_attr_ctx_cache_name, 3149 sizeof(ntfs_attr_search_ctx), 0 /* offset */, 3150 SLAB_HWCACHE_ALIGN, NULL /* ctor */); 3151 if (!ntfs_attr_ctx_cache) { 3152 printk(KERN_CRIT "NTFS: Failed to create %s!\n", 3153 ntfs_attr_ctx_cache_name); 3154 goto actx_err_out; 3155 } 3156 3157 ntfs_name_cache = kmem_cache_create(ntfs_name_cache_name, 3158 (NTFS_MAX_NAME_LEN+1) * sizeof(ntfschar), 0, 3159 SLAB_HWCACHE_ALIGN, NULL); 3160 if (!ntfs_name_cache) { 3161 printk(KERN_CRIT "NTFS: Failed to create %s!\n", 3162 ntfs_name_cache_name); 3163 goto name_err_out; 3164 } 3165 3166 ntfs_inode_cache = kmem_cache_create(ntfs_inode_cache_name, 3167 sizeof(ntfs_inode), 0, 3168 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL); 3169 if (!ntfs_inode_cache) { 3170 printk(KERN_CRIT "NTFS: Failed to create %s!\n", 3171 ntfs_inode_cache_name); 3172 goto inode_err_out; 3173 } 3174 3175 ntfs_big_inode_cache = kmem_cache_create(ntfs_big_inode_cache_name, 3176 sizeof(big_ntfs_inode), 0, 3177 SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 3178 ntfs_big_inode_init_once); 3179 if (!ntfs_big_inode_cache) { 3180 printk(KERN_CRIT "NTFS: Failed to create %s!\n", 3181 ntfs_big_inode_cache_name); 3182 goto big_inode_err_out; 3183 } 3184 3185 /* Register the ntfs sysctls. */ 3186 err = ntfs_sysctl(1); 3187 if (err) { 3188 printk(KERN_CRIT "NTFS: Failed to register NTFS sysctls!\n"); 3189 goto sysctl_err_out; 3190 } 3191 3192 err = register_filesystem(&ntfs_fs_type); 3193 if (!err) { 3194 ntfs_debug("NTFS driver registered successfully."); 3195 return 0; /* Success! */ 3196 } 3197 printk(KERN_CRIT "NTFS: Failed to register NTFS filesystem driver!\n"); 3198 3199 sysctl_err_out: 3200 kmem_cache_destroy(ntfs_big_inode_cache); 3201 big_inode_err_out: 3202 kmem_cache_destroy(ntfs_inode_cache); 3203 inode_err_out: 3204 kmem_cache_destroy(ntfs_name_cache); 3205 name_err_out: 3206 kmem_cache_destroy(ntfs_attr_ctx_cache); 3207 actx_err_out: 3208 kmem_cache_destroy(ntfs_index_ctx_cache); 3209 ictx_err_out: 3210 if (!err) { 3211 printk(KERN_CRIT "NTFS: Aborting NTFS filesystem driver " 3212 "registration...\n"); 3213 err = -ENOMEM; 3214 } 3215 return err; 3216 } 3217 3218 static void __exit exit_ntfs_fs(void) 3219 { 3220 ntfs_debug("Unregistering NTFS driver."); 3221 3222 unregister_filesystem(&ntfs_fs_type); 3223 kmem_cache_destroy(ntfs_big_inode_cache); 3224 kmem_cache_destroy(ntfs_inode_cache); 3225 kmem_cache_destroy(ntfs_name_cache); 3226 kmem_cache_destroy(ntfs_attr_ctx_cache); 3227 kmem_cache_destroy(ntfs_index_ctx_cache); 3228 /* Unregister the ntfs sysctls. */ 3229 ntfs_sysctl(0); 3230 } 3231 3232 MODULE_AUTHOR("Anton Altaparmakov <aia21@cantab.net>"); 3233 MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2007 Anton Altaparmakov"); 3234 MODULE_VERSION(NTFS_VERSION); 3235 MODULE_LICENSE("GPL"); 3236 #ifdef DEBUG 3237 module_param(debug_msgs, bool, 0); 3238 MODULE_PARM_DESC(debug_msgs, "Enable debug messages."); 3239 #endif 3240 3241 module_init(init_ntfs_fs) 3242 module_exit(exit_ntfs_fs) 3243