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505 return -EROFS; 506 } 507 if (!ntfs_mark_quotas_out_of_date(vol)) { 508 ntfs_error(sb, "Failed to mark quotas out of date%s", 509 es); 510 NVolSetErrors(vol); 511 unlock_kernel(); 512 return -EROFS; 513 } 514 if (!ntfs_stamp_usnjrnl(vol)) { 515 ntfs_error(sb, "Failed to stamp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