1 /* 2 * super.c - NTFS kernel super block handling. Part of the Linux-NTFS project. 3 * 4 * Copyright (c) 2001-2004 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/string.h> 26 #include <linux/spinlock.h> 27 #include <linux/blkdev.h> /* For bdev_hardsect_size(). */ 28 #include <linux/backing-dev.h> 29 #include <linux/buffer_head.h> 30 #include <linux/vfs.h> 31 #include <linux/moduleparam.h> 32 #include <linux/smp_lock.h> 33 34 #include "sysctl.h" 35 #include "logfile.h" 36 #include "quota.h" 37 #include "dir.h" 38 #include "debug.h" 39 #include "index.h" 40 #include "aops.h" 41 #include "malloc.h" 42 #include "ntfs.h" 43 44 /* Number of mounted file systems which have compression enabled. */ 45 static unsigned long ntfs_nr_compression_users; 46 47 /* A global default upcase table and a corresponding reference count. */ 48 static ntfschar *default_upcase = NULL; 49 static unsigned long ntfs_nr_upcase_users = 0; 50 51 /* Error constants/strings used in inode.c::ntfs_show_options(). */ 52 typedef enum { 53 /* One of these must be present, default is ON_ERRORS_CONTINUE. */ 54 ON_ERRORS_PANIC = 0x01, 55 ON_ERRORS_REMOUNT_RO = 0x02, 56 ON_ERRORS_CONTINUE = 0x04, 57 /* Optional, can be combined with any of the above. */ 58 ON_ERRORS_RECOVER = 0x10, 59 } ON_ERRORS_ACTIONS; 60 61 const option_t on_errors_arr[] = { 62 { ON_ERRORS_PANIC, "panic" }, 63 { ON_ERRORS_REMOUNT_RO, "remount-ro", }, 64 { ON_ERRORS_CONTINUE, "continue", }, 65 { ON_ERRORS_RECOVER, "recover" }, 66 { 0, NULL } 67 }; 68 69 /** 70 * simple_getbool - 71 * 72 * Copied from old ntfs driver (which copied from vfat driver). 73 */ 74 static int simple_getbool(char *s, BOOL *setval) 75 { 76 if (s) { 77 if (!strcmp(s, "1") || !strcmp(s, "yes") || !strcmp(s, "true")) 78 *setval = TRUE; 79 else if (!strcmp(s, "0") || !strcmp(s, "no") || 80 !strcmp(s, "false")) 81 *setval = FALSE; 82 else 83 return 0; 84 } else 85 *setval = TRUE; 86 return 1; 87 } 88 89 /** 90 * parse_options - parse the (re)mount options 91 * @vol: ntfs volume 92 * @opt: string containing the (re)mount options 93 * 94 * Parse the recognized options in @opt for the ntfs volume described by @vol. 95 */ 96 static BOOL parse_options(ntfs_volume *vol, char *opt) 97 { 98 char *p, *v, *ov; 99 static char *utf8 = "utf8"; 100 int errors = 0, sloppy = 0; 101 uid_t uid = (uid_t)-1; 102 gid_t gid = (gid_t)-1; 103 mode_t fmask = (mode_t)-1, dmask = (mode_t)-1; 104 int mft_zone_multiplier = -1, on_errors = -1; 105 int show_sys_files = -1, case_sensitive = -1; 106 struct nls_table *nls_map = NULL, *old_nls; 107 108 /* I am lazy... (-8 */ 109 #define NTFS_GETOPT_WITH_DEFAULT(option, variable, default_value) \ 110 if (!strcmp(p, option)) { \ 111 if (!v || !*v) \ 112 variable = default_value; \ 113 else { \ 114 variable = simple_strtoul(ov = v, &v, 0); \ 115 if (*v) \ 116 goto needs_val; \ 117 } \ 118 } 119 #define NTFS_GETOPT(option, variable) \ 120 if (!strcmp(p, option)) { \ 121 if (!v || !*v) \ 122 goto needs_arg; \ 123 variable = simple_strtoul(ov = v, &v, 0); \ 124 if (*v) \ 125 goto needs_val; \ 126 } 127 #define NTFS_GETOPT_BOOL(option, variable) \ 128 if (!strcmp(p, option)) { \ 129 BOOL val; \ 130 if (!simple_getbool(v, &val)) \ 131 goto needs_bool; \ 132 variable = val; \ 133 } 134 #define NTFS_GETOPT_OPTIONS_ARRAY(option, variable, opt_array) \ 135 if (!strcmp(p, option)) { \ 136 int _i; \ 137 if (!v || !*v) \ 138 goto needs_arg; \ 139 ov = v; \ 140 if (variable == -1) \ 141 variable = 0; \ 142 for (_i = 0; opt_array[_i].str && *opt_array[_i].str; _i++) \ 143 if (!strcmp(opt_array[_i].str, v)) { \ 144 variable |= opt_array[_i].val; \ 145 break; \ 146 } \ 147 if (!opt_array[_i].str || !*opt_array[_i].str) \ 148 goto needs_val; \ 149 } 150 if (!opt || !*opt) 151 goto no_mount_options; 152 ntfs_debug("Entering with mount options string: %s", opt); 153 while ((p = strsep(&opt, ","))) { 154 if ((v = strchr(p, '='))) 155 *v++ = 0; 156 NTFS_GETOPT("uid", uid) 157 else NTFS_GETOPT("gid", gid) 158 else NTFS_GETOPT("umask", fmask = dmask) 159 else NTFS_GETOPT("fmask", fmask) 160 else NTFS_GETOPT("dmask", dmask) 161 else NTFS_GETOPT("mft_zone_multiplier", mft_zone_multiplier) 162 else NTFS_GETOPT_WITH_DEFAULT("sloppy", sloppy, TRUE) 163 else NTFS_GETOPT_BOOL("show_sys_files", show_sys_files) 164 else NTFS_GETOPT_BOOL("case_sensitive", case_sensitive) 165 else NTFS_GETOPT_OPTIONS_ARRAY("errors", on_errors, 166 on_errors_arr) 167 else if (!strcmp(p, "posix") || !strcmp(p, "show_inodes")) 168 ntfs_warning(vol->sb, "Ignoring obsolete option %s.", 169 p); 170 else if (!strcmp(p, "nls") || !strcmp(p, "iocharset")) { 171 if (!strcmp(p, "iocharset")) 172 ntfs_warning(vol->sb, "Option iocharset is " 173 "deprecated. Please use " 174 "option nls=<charsetname> in " 175 "the future."); 176 if (!v || !*v) 177 goto needs_arg; 178 use_utf8: 179 old_nls = nls_map; 180 nls_map = load_nls(v); 181 if (!nls_map) { 182 if (!old_nls) { 183 ntfs_error(vol->sb, "NLS character set " 184 "%s not found.", v); 185 return FALSE; 186 } 187 ntfs_error(vol->sb, "NLS character set %s not " 188 "found. Using previous one %s.", 189 v, old_nls->charset); 190 nls_map = old_nls; 191 } else /* nls_map */ { 192 if (old_nls) 193 unload_nls(old_nls); 194 } 195 } else if (!strcmp(p, "utf8")) { 196 BOOL val = FALSE; 197 ntfs_warning(vol->sb, "Option utf8 is no longer " 198 "supported, using option nls=utf8. Please " 199 "use option nls=utf8 in the future and " 200 "make sure utf8 is compiled either as a " 201 "module or into the kernel."); 202 if (!v || !*v) 203 val = TRUE; 204 else if (!simple_getbool(v, &val)) 205 goto needs_bool; 206 if (val) { 207 v = utf8; 208 goto use_utf8; 209 } 210 } else { 211 ntfs_error(vol->sb, "Unrecognized mount option %s.", p); 212 if (errors < INT_MAX) 213 errors++; 214 } 215 #undef NTFS_GETOPT_OPTIONS_ARRAY 216 #undef NTFS_GETOPT_BOOL 217 #undef NTFS_GETOPT 218 #undef NTFS_GETOPT_WITH_DEFAULT 219 } 220 no_mount_options: 221 if (errors && !sloppy) 222 return FALSE; 223 if (sloppy) 224 ntfs_warning(vol->sb, "Sloppy option given. Ignoring " 225 "unrecognized mount option(s) and continuing."); 226 /* Keep this first! */ 227 if (on_errors != -1) { 228 if (!on_errors) { 229 ntfs_error(vol->sb, "Invalid errors option argument " 230 "or bug in options parser."); 231 return FALSE; 232 } 233 } 234 if (nls_map) { 235 if (vol->nls_map && vol->nls_map != nls_map) { 236 ntfs_error(vol->sb, "Cannot change NLS character set " 237 "on remount."); 238 return FALSE; 239 } /* else (!vol->nls_map) */ 240 ntfs_debug("Using NLS character set %s.", nls_map->charset); 241 vol->nls_map = nls_map; 242 } else /* (!nls_map) */ { 243 if (!vol->nls_map) { 244 vol->nls_map = load_nls_default(); 245 if (!vol->nls_map) { 246 ntfs_error(vol->sb, "Failed to load default " 247 "NLS character set."); 248 return FALSE; 249 } 250 ntfs_debug("Using default NLS character set (%s).", 251 vol->nls_map->charset); 252 } 253 } 254 if (mft_zone_multiplier != -1) { 255 if (vol->mft_zone_multiplier && vol->mft_zone_multiplier != 256 mft_zone_multiplier) { 257 ntfs_error(vol->sb, "Cannot change mft_zone_multiplier " 258 "on remount."); 259 return FALSE; 260 } 261 if (mft_zone_multiplier < 1 || mft_zone_multiplier > 4) { 262 ntfs_error(vol->sb, "Invalid mft_zone_multiplier. " 263 "Using default value, i.e. 1."); 264 mft_zone_multiplier = 1; 265 } 266 vol->mft_zone_multiplier = mft_zone_multiplier; 267 } 268 if (!vol->mft_zone_multiplier) 269 vol->mft_zone_multiplier = 1; 270 if (on_errors != -1) 271 vol->on_errors = on_errors; 272 if (!vol->on_errors || vol->on_errors == ON_ERRORS_RECOVER) 273 vol->on_errors |= ON_ERRORS_CONTINUE; 274 if (uid != (uid_t)-1) 275 vol->uid = uid; 276 if (gid != (gid_t)-1) 277 vol->gid = gid; 278 if (fmask != (mode_t)-1) 279 vol->fmask = fmask; 280 if (dmask != (mode_t)-1) 281 vol->dmask = dmask; 282 if (show_sys_files != -1) { 283 if (show_sys_files) 284 NVolSetShowSystemFiles(vol); 285 else 286 NVolClearShowSystemFiles(vol); 287 } 288 if (case_sensitive != -1) { 289 if (case_sensitive) 290 NVolSetCaseSensitive(vol); 291 else 292 NVolClearCaseSensitive(vol); 293 } 294 return TRUE; 295 needs_arg: 296 ntfs_error(vol->sb, "The %s option requires an argument.", p); 297 return FALSE; 298 needs_bool: 299 ntfs_error(vol->sb, "The %s option requires a boolean argument.", p); 300 return FALSE; 301 needs_val: 302 ntfs_error(vol->sb, "Invalid %s option argument: %s", p, ov); 303 return FALSE; 304 } 305 306 #ifdef NTFS_RW 307 308 /** 309 * ntfs_write_volume_flags - write new flags to the volume information flags 310 * @vol: ntfs volume on which to modify the flags 311 * @flags: new flags value for the volume information flags 312 * 313 * Internal function. You probably want to use ntfs_{set,clear}_volume_flags() 314 * instead (see below). 315 * 316 * Replace the volume information flags on the volume @vol with the value 317 * supplied in @flags. Note, this overwrites the volume information flags, so 318 * make sure to combine the flags you want to modify with the old flags and use 319 * the result when calling ntfs_write_volume_flags(). 320 * 321 * Return 0 on success and -errno on error. 322 */ 323 static int ntfs_write_volume_flags(ntfs_volume *vol, const VOLUME_FLAGS flags) 324 { 325 ntfs_inode *ni = NTFS_I(vol->vol_ino); 326 MFT_RECORD *m; 327 VOLUME_INFORMATION *vi; 328 ntfs_attr_search_ctx *ctx; 329 int err; 330 331 ntfs_debug("Entering, old flags = 0x%x, new flags = 0x%x.", 332 le16_to_cpu(vol->vol_flags), le16_to_cpu(flags)); 333 if (vol->vol_flags == flags) 334 goto done; 335 BUG_ON(!ni); 336 m = map_mft_record(ni); 337 if (IS_ERR(m)) { 338 err = PTR_ERR(m); 339 goto err_out; 340 } 341 ctx = ntfs_attr_get_search_ctx(ni, m); 342 if (!ctx) { 343 err = -ENOMEM; 344 goto put_unm_err_out; 345 } 346 err = ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0, 347 ctx); 348 if (err) 349 goto put_unm_err_out; 350 vi = (VOLUME_INFORMATION*)((u8*)ctx->attr + 351 le16_to_cpu(ctx->attr->data.resident.value_offset)); 352 vol->vol_flags = vi->flags = flags; 353 flush_dcache_mft_record_page(ctx->ntfs_ino); 354 mark_mft_record_dirty(ctx->ntfs_ino); 355 ntfs_attr_put_search_ctx(ctx); 356 unmap_mft_record(ni); 357 done: 358 ntfs_debug("Done."); 359 return 0; 360 put_unm_err_out: 361 if (ctx) 362 ntfs_attr_put_search_ctx(ctx); 363 unmap_mft_record(ni); 364 err_out: 365 ntfs_error(vol->sb, "Failed with error code %i.", -err); 366 return err; 367 } 368 369 /** 370 * ntfs_set_volume_flags - set bits in the volume information flags 371 * @vol: ntfs volume on which to modify the flags 372 * @flags: flags to set on the volume 373 * 374 * Set the bits in @flags in the volume information flags on the volume @vol. 375 * 376 * Return 0 on success and -errno on error. 377 */ 378 static inline int ntfs_set_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags) 379 { 380 flags &= VOLUME_FLAGS_MASK; 381 return ntfs_write_volume_flags(vol, vol->vol_flags | flags); 382 } 383 384 /** 385 * ntfs_clear_volume_flags - clear bits in the volume information flags 386 * @vol: ntfs volume on which to modify the flags 387 * @flags: flags to clear on the volume 388 * 389 * Clear the bits in @flags in the volume information flags on the volume @vol. 390 * 391 * Return 0 on success and -errno on error. 392 */ 393 static inline int ntfs_clear_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags) 394 { 395 flags &= VOLUME_FLAGS_MASK; 396 flags = vol->vol_flags & cpu_to_le16(~le16_to_cpu(flags)); 397 return ntfs_write_volume_flags(vol, flags); 398 } 399 400 #endif /* NTFS_RW */ 401 402 /** 403 * ntfs_remount - change the mount options of a mounted ntfs filesystem 404 * @sb: superblock of mounted ntfs filesystem 405 * @flags: remount flags 406 * @opt: remount options string 407 * 408 * Change the mount options of an already mounted ntfs filesystem. 409 * 410 * NOTE: The VFS sets the @sb->s_flags remount flags to @flags after 411 * ntfs_remount() returns successfully (i.e. returns 0). Otherwise, 412 * @sb->s_flags are not changed. 413 */ 414 static int ntfs_remount(struct super_block *sb, int *flags, char *opt) 415 { 416 ntfs_volume *vol = NTFS_SB(sb); 417 418 ntfs_debug("Entering with remount options string: %s", opt); 419 #ifndef NTFS_RW 420 /* For read-only compiled driver, enforce all read-only flags. */ 421 *flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; 422 #else /* NTFS_RW */ 423 /* 424 * For the read-write compiled driver, if we are remounting read-write, 425 * make sure there are no volume errors and that no unsupported volume 426 * flags are set. Also, empty the logfile journal as it would become 427 * stale as soon as something is written to the volume and mark the 428 * volume dirty so that chkdsk is run if the volume is not umounted 429 * cleanly. Finally, mark the quotas out of date so Windows rescans 430 * the volume on boot and updates them. 431 * 432 * When remounting read-only, mark the volume clean if no volume errors 433 * have occured. 434 */ 435 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 436 static const char *es = ". Cannot remount read-write."; 437 438 /* Remounting read-write. */ 439 if (NVolErrors(vol)) { 440 ntfs_error(sb, "Volume has errors and is read-only%s", 441 es); 442 return -EROFS; 443 } 444 if (vol->vol_flags & VOLUME_IS_DIRTY) { 445 ntfs_error(sb, "Volume is dirty and read-only%s", es); 446 return -EROFS; 447 } 448 if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { 449 ntfs_error(sb, "Volume has unsupported flags set and " 450 "is read-only%s", es); 451 return -EROFS; 452 } 453 if (ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) { 454 ntfs_error(sb, "Failed to set dirty bit in volume " 455 "information flags%s", es); 456 return -EROFS; 457 } 458 #if 0 459 // TODO: Enable this code once we start modifying anything that 460 // is different between NTFS 1.2 and 3.x... 461 /* Set NT4 compatibility flag on newer NTFS version volumes. */ 462 if ((vol->major_ver > 1)) { 463 if (ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) { 464 ntfs_error(sb, "Failed to set NT4 " 465 "compatibility flag%s", es); 466 NVolSetErrors(vol); 467 return -EROFS; 468 } 469 } 470 #endif 471 if (!ntfs_empty_logfile(vol->logfile_ino)) { 472 ntfs_error(sb, "Failed to empty journal $LogFile%s", 473 es); 474 NVolSetErrors(vol); 475 return -EROFS; 476 } 477 if (!ntfs_mark_quotas_out_of_date(vol)) { 478 ntfs_error(sb, "Failed to mark quotas out of date%s", 479 es); 480 NVolSetErrors(vol); 481 return -EROFS; 482 } 483 } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) { 484 /* Remounting read-only. */ 485 if (!NVolErrors(vol)) { 486 if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY)) 487 ntfs_warning(sb, "Failed to clear dirty bit " 488 "in volume information " 489 "flags. Run chkdsk."); 490 } 491 } 492 #endif /* NTFS_RW */ 493 494 // TODO: Deal with *flags. 495 496 if (!parse_options(vol, opt)) 497 return -EINVAL; 498 ntfs_debug("Done."); 499 return 0; 500 } 501 502 /** 503 * is_boot_sector_ntfs - check whether a boot sector is a valid NTFS boot sector 504 * @sb: Super block of the device to which @b belongs. 505 * @b: Boot sector of device @sb to check. 506 * @silent: If TRUE, all output will be silenced. 507 * 508 * is_boot_sector_ntfs() checks whether the boot sector @b is a valid NTFS boot 509 * sector. Returns TRUE if it is valid and FALSE if not. 510 * 511 * @sb is only needed for warning/error output, i.e. it can be NULL when silent 512 * is TRUE. 513 */ 514 static BOOL is_boot_sector_ntfs(const struct super_block *sb, 515 const NTFS_BOOT_SECTOR *b, const BOOL silent) 516 { 517 /* 518 * Check that checksum == sum of u32 values from b to the checksum 519 * field. If checksum is zero, no checking is done. 520 */ 521 if ((void*)b < (void*)&b->checksum && b->checksum) { 522 le32 *u; 523 u32 i; 524 525 for (i = 0, u = (le32*)b; u < (le32*)(&b->checksum); ++u) 526 i += le32_to_cpup(u); 527 if (le32_to_cpu(b->checksum) != i) 528 goto not_ntfs; 529 } 530 /* Check OEMidentifier is "NTFS " */ 531 if (b->oem_id != magicNTFS) 532 goto not_ntfs; 533 /* Check bytes per sector value is between 256 and 4096. */ 534 if (le16_to_cpu(b->bpb.bytes_per_sector) < 0x100 || 535 le16_to_cpu(b->bpb.bytes_per_sector) > 0x1000) 536 goto not_ntfs; 537 /* Check sectors per cluster value is valid. */ 538 switch (b->bpb.sectors_per_cluster) { 539 case 1: case 2: case 4: case 8: case 16: case 32: case 64: case 128: 540 break; 541 default: 542 goto not_ntfs; 543 } 544 /* Check the cluster size is not above 65536 bytes. */ 545 if ((u32)le16_to_cpu(b->bpb.bytes_per_sector) * 546 b->bpb.sectors_per_cluster > 0x10000) 547 goto not_ntfs; 548 /* Check reserved/unused fields are really zero. */ 549 if (le16_to_cpu(b->bpb.reserved_sectors) || 550 le16_to_cpu(b->bpb.root_entries) || 551 le16_to_cpu(b->bpb.sectors) || 552 le16_to_cpu(b->bpb.sectors_per_fat) || 553 le32_to_cpu(b->bpb.large_sectors) || b->bpb.fats) 554 goto not_ntfs; 555 /* Check clusters per file mft record value is valid. */ 556 if ((u8)b->clusters_per_mft_record < 0xe1 || 557 (u8)b->clusters_per_mft_record > 0xf7) 558 switch (b->clusters_per_mft_record) { 559 case 1: case 2: case 4: case 8: case 16: case 32: case 64: 560 break; 561 default: 562 goto not_ntfs; 563 } 564 /* Check clusters per index block value is valid. */ 565 if ((u8)b->clusters_per_index_record < 0xe1 || 566 (u8)b->clusters_per_index_record > 0xf7) 567 switch (b->clusters_per_index_record) { 568 case 1: case 2: case 4: case 8: case 16: case 32: case 64: 569 break; 570 default: 571 goto not_ntfs; 572 } 573 /* 574 * Check for valid end of sector marker. We will work without it, but 575 * many BIOSes will refuse to boot from a bootsector if the magic is 576 * incorrect, so we emit a warning. 577 */ 578 if (!silent && b->end_of_sector_marker != cpu_to_le16(0xaa55)) 579 ntfs_warning(sb, "Invalid end of sector marker."); 580 return TRUE; 581 not_ntfs: 582 return FALSE; 583 } 584 585 /** 586 * read_ntfs_boot_sector - read the NTFS boot sector of a device 587 * @sb: super block of device to read the boot sector from 588 * @silent: if true, suppress all output 589 * 590 * Reads the boot sector from the device and validates it. If that fails, tries 591 * to read the backup boot sector, first from the end of the device a-la NT4 and 592 * later and then from the middle of the device a-la NT3.51 and before. 593 * 594 * If a valid boot sector is found but it is not the primary boot sector, we 595 * repair the primary boot sector silently (unless the device is read-only or 596 * the primary boot sector is not accessible). 597 * 598 * NOTE: To call this function, @sb must have the fields s_dev, the ntfs super 599 * block (u.ntfs_sb), nr_blocks and the device flags (s_flags) initialized 600 * to their respective values. 601 * 602 * Return the unlocked buffer head containing the boot sector or NULL on error. 603 */ 604 static struct buffer_head *read_ntfs_boot_sector(struct super_block *sb, 605 const int silent) 606 { 607 const char *read_err_str = "Unable to read %s boot sector."; 608 struct buffer_head *bh_primary, *bh_backup; 609 long nr_blocks = NTFS_SB(sb)->nr_blocks; 610 611 /* Try to read primary boot sector. */ 612 if ((bh_primary = sb_bread(sb, 0))) { 613 if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) 614 bh_primary->b_data, silent)) 615 return bh_primary; 616 if (!silent) 617 ntfs_error(sb, "Primary boot sector is invalid."); 618 } else if (!silent) 619 ntfs_error(sb, read_err_str, "primary"); 620 if (!(NTFS_SB(sb)->on_errors & ON_ERRORS_RECOVER)) { 621 if (bh_primary) 622 brelse(bh_primary); 623 if (!silent) 624 ntfs_error(sb, "Mount option errors=recover not used. " 625 "Aborting without trying to recover."); 626 return NULL; 627 } 628 /* Try to read NT4+ backup boot sector. */ 629 if ((bh_backup = sb_bread(sb, nr_blocks - 1))) { 630 if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) 631 bh_backup->b_data, silent)) 632 goto hotfix_primary_boot_sector; 633 brelse(bh_backup); 634 } else if (!silent) 635 ntfs_error(sb, read_err_str, "backup"); 636 /* Try to read NT3.51- backup boot sector. */ 637 if ((bh_backup = sb_bread(sb, nr_blocks >> 1))) { 638 if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) 639 bh_backup->b_data, silent)) 640 goto hotfix_primary_boot_sector; 641 if (!silent) 642 ntfs_error(sb, "Could not find a valid backup boot " 643 "sector."); 644 brelse(bh_backup); 645 } else if (!silent) 646 ntfs_error(sb, read_err_str, "backup"); 647 /* We failed. Cleanup and return. */ 648 if (bh_primary) 649 brelse(bh_primary); 650 return NULL; 651 hotfix_primary_boot_sector: 652 if (bh_primary) { 653 /* 654 * If we managed to read sector zero and the volume is not 655 * read-only, copy the found, valid backup boot sector to the 656 * primary boot sector. 657 */ 658 if (!(sb->s_flags & MS_RDONLY)) { 659 ntfs_warning(sb, "Hot-fix: Recovering invalid primary " 660 "boot sector from backup copy."); 661 memcpy(bh_primary->b_data, bh_backup->b_data, 662 sb->s_blocksize); 663 mark_buffer_dirty(bh_primary); 664 sync_dirty_buffer(bh_primary); 665 if (buffer_uptodate(bh_primary)) { 666 brelse(bh_backup); 667 return bh_primary; 668 } 669 ntfs_error(sb, "Hot-fix: Device write error while " 670 "recovering primary boot sector."); 671 } else { 672 ntfs_warning(sb, "Hot-fix: Recovery of primary boot " 673 "sector failed: Read-only mount."); 674 } 675 brelse(bh_primary); 676 } 677 ntfs_warning(sb, "Using backup boot sector."); 678 return bh_backup; 679 } 680 681 /** 682 * parse_ntfs_boot_sector - parse the boot sector and store the data in @vol 683 * @vol: volume structure to initialise with data from boot sector 684 * @b: boot sector to parse 685 * 686 * Parse the ntfs boot sector @b and store all imporant information therein in 687 * the ntfs super block @vol. Return TRUE on success and FALSE on error. 688 */ 689 static BOOL parse_ntfs_boot_sector(ntfs_volume *vol, const NTFS_BOOT_SECTOR *b) 690 { 691 unsigned int sectors_per_cluster_bits, nr_hidden_sects; 692 int clusters_per_mft_record, clusters_per_index_record; 693 s64 ll; 694 695 vol->sector_size = le16_to_cpu(b->bpb.bytes_per_sector); 696 vol->sector_size_bits = ffs(vol->sector_size) - 1; 697 ntfs_debug("vol->sector_size = %i (0x%x)", vol->sector_size, 698 vol->sector_size); 699 ntfs_debug("vol->sector_size_bits = %i (0x%x)", vol->sector_size_bits, 700 vol->sector_size_bits); 701 if (vol->sector_size != vol->sb->s_blocksize) 702 ntfs_warning(vol->sb, "The boot sector indicates a sector size " 703 "different from the device sector size."); 704 ntfs_debug("sectors_per_cluster = 0x%x", b->bpb.sectors_per_cluster); 705 sectors_per_cluster_bits = ffs(b->bpb.sectors_per_cluster) - 1; 706 ntfs_debug("sectors_per_cluster_bits = 0x%x", 707 sectors_per_cluster_bits); 708 nr_hidden_sects = le32_to_cpu(b->bpb.hidden_sectors); 709 ntfs_debug("number of hidden sectors = 0x%x", nr_hidden_sects); 710 vol->cluster_size = vol->sector_size << sectors_per_cluster_bits; 711 vol->cluster_size_mask = vol->cluster_size - 1; 712 vol->cluster_size_bits = ffs(vol->cluster_size) - 1; 713 ntfs_debug("vol->cluster_size = %i (0x%x)", vol->cluster_size, 714 vol->cluster_size); 715 ntfs_debug("vol->cluster_size_mask = 0x%x", vol->cluster_size_mask); 716 ntfs_debug("vol->cluster_size_bits = %i (0x%x)", 717 vol->cluster_size_bits, vol->cluster_size_bits); 718 if (vol->sector_size > vol->cluster_size) { 719 ntfs_error(vol->sb, "Sector sizes above the cluster size are " 720 "not supported. Sorry."); 721 return FALSE; 722 } 723 if (vol->sb->s_blocksize > vol->cluster_size) { 724 ntfs_error(vol->sb, "Cluster sizes smaller than the device " 725 "sector size are not supported. Sorry."); 726 return FALSE; 727 } 728 clusters_per_mft_record = b->clusters_per_mft_record; 729 ntfs_debug("clusters_per_mft_record = %i (0x%x)", 730 clusters_per_mft_record, clusters_per_mft_record); 731 if (clusters_per_mft_record > 0) 732 vol->mft_record_size = vol->cluster_size << 733 (ffs(clusters_per_mft_record) - 1); 734 else 735 /* 736 * When mft_record_size < cluster_size, clusters_per_mft_record 737 * = -log2(mft_record_size) bytes. mft_record_size normaly is 738 * 1024 bytes, which is encoded as 0xF6 (-10 in decimal). 739 */ 740 vol->mft_record_size = 1 << -clusters_per_mft_record; 741 vol->mft_record_size_mask = vol->mft_record_size - 1; 742 vol->mft_record_size_bits = ffs(vol->mft_record_size) - 1; 743 ntfs_debug("vol->mft_record_size = %i (0x%x)", vol->mft_record_size, 744 vol->mft_record_size); 745 ntfs_debug("vol->mft_record_size_mask = 0x%x", 746 vol->mft_record_size_mask); 747 ntfs_debug("vol->mft_record_size_bits = %i (0x%x)", 748 vol->mft_record_size_bits, vol->mft_record_size_bits); 749 /* 750 * We cannot support mft record sizes above the PAGE_CACHE_SIZE since 751 * we store $MFT/$DATA, the table of mft records in the page cache. 752 */ 753 if (vol->mft_record_size > PAGE_CACHE_SIZE) { 754 ntfs_error(vol->sb, "Mft record size %i (0x%x) exceeds the " 755 "page cache size on your system %lu (0x%lx). " 756 "This is not supported. Sorry.", 757 vol->mft_record_size, vol->mft_record_size, 758 PAGE_CACHE_SIZE, PAGE_CACHE_SIZE); 759 return FALSE; 760 } 761 clusters_per_index_record = b->clusters_per_index_record; 762 ntfs_debug("clusters_per_index_record = %i (0x%x)", 763 clusters_per_index_record, clusters_per_index_record); 764 if (clusters_per_index_record > 0) 765 vol->index_record_size = vol->cluster_size << 766 (ffs(clusters_per_index_record) - 1); 767 else 768 /* 769 * When index_record_size < cluster_size, 770 * clusters_per_index_record = -log2(index_record_size) bytes. 771 * index_record_size normaly equals 4096 bytes, which is 772 * encoded as 0xF4 (-12 in decimal). 773 */ 774 vol->index_record_size = 1 << -clusters_per_index_record; 775 vol->index_record_size_mask = vol->index_record_size - 1; 776 vol->index_record_size_bits = ffs(vol->index_record_size) - 1; 777 ntfs_debug("vol->index_record_size = %i (0x%x)", 778 vol->index_record_size, vol->index_record_size); 779 ntfs_debug("vol->index_record_size_mask = 0x%x", 780 vol->index_record_size_mask); 781 ntfs_debug("vol->index_record_size_bits = %i (0x%x)", 782 vol->index_record_size_bits, 783 vol->index_record_size_bits); 784 /* 785 * Get the size of the volume in clusters and check for 64-bit-ness. 786 * Windows currently only uses 32 bits to save the clusters so we do 787 * the same as it is much faster on 32-bit CPUs. 788 */ 789 ll = sle64_to_cpu(b->number_of_sectors) >> sectors_per_cluster_bits; 790 if ((u64)ll >= 1ULL << 32) { 791 ntfs_error(vol->sb, "Cannot handle 64-bit clusters. Sorry."); 792 return FALSE; 793 } 794 vol->nr_clusters = ll; 795 ntfs_debug("vol->nr_clusters = 0x%llx", (long long)vol->nr_clusters); 796 /* 797 * On an architecture where unsigned long is 32-bits, we restrict the 798 * volume size to 2TiB (2^41). On a 64-bit architecture, the compiler 799 * will hopefully optimize the whole check away. 800 */ 801 if (sizeof(unsigned long) < 8) { 802 if ((ll << vol->cluster_size_bits) >= (1ULL << 41)) { 803 ntfs_error(vol->sb, "Volume size (%lluTiB) is too " 804 "large for this architecture. " 805 "Maximum supported is 2TiB. Sorry.", 806 (unsigned long long)ll >> (40 - 807 vol->cluster_size_bits)); 808 return FALSE; 809 } 810 } 811 ll = sle64_to_cpu(b->mft_lcn); 812 if (ll >= vol->nr_clusters) { 813 ntfs_error(vol->sb, "MFT LCN is beyond end of volume. Weird."); 814 return FALSE; 815 } 816 vol->mft_lcn = ll; 817 ntfs_debug("vol->mft_lcn = 0x%llx", (long long)vol->mft_lcn); 818 ll = sle64_to_cpu(b->mftmirr_lcn); 819 if (ll >= vol->nr_clusters) { 820 ntfs_error(vol->sb, "MFTMirr LCN is beyond end of volume. " 821 "Weird."); 822 return FALSE; 823 } 824 vol->mftmirr_lcn = ll; 825 ntfs_debug("vol->mftmirr_lcn = 0x%llx", (long long)vol->mftmirr_lcn); 826 #ifdef NTFS_RW 827 /* 828 * Work out the size of the mft mirror in number of mft records. If the 829 * cluster size is less than or equal to the size taken by four mft 830 * records, the mft mirror stores the first four mft records. If the 831 * cluster size is bigger than the size taken by four mft records, the 832 * mft mirror contains as many mft records as will fit into one 833 * cluster. 834 */ 835 if (vol->cluster_size <= (4 << vol->mft_record_size_bits)) 836 vol->mftmirr_size = 4; 837 else 838 vol->mftmirr_size = vol->cluster_size >> 839 vol->mft_record_size_bits; 840 ntfs_debug("vol->mftmirr_size = %i", vol->mftmirr_size); 841 #endif /* NTFS_RW */ 842 vol->serial_no = le64_to_cpu(b->volume_serial_number); 843 ntfs_debug("vol->serial_no = 0x%llx", 844 (unsigned long long)vol->serial_no); 845 return TRUE; 846 } 847 848 /** 849 * ntfs_setup_allocators - initialize the cluster and mft allocators 850 * @vol: volume structure for which to setup the allocators 851 * 852 * Setup the cluster (lcn) and mft allocators to the starting values. 853 */ 854 static void ntfs_setup_allocators(ntfs_volume *vol) 855 { 856 #ifdef NTFS_RW 857 LCN mft_zone_size, mft_lcn; 858 #endif /* NTFS_RW */ 859 860 ntfs_debug("vol->mft_zone_multiplier = 0x%x", 861 vol->mft_zone_multiplier); 862 #ifdef NTFS_RW 863 /* Determine the size of the MFT zone. */ 864 mft_zone_size = vol->nr_clusters; 865 switch (vol->mft_zone_multiplier) { /* % of volume size in clusters */ 866 case 4: 867 mft_zone_size >>= 1; /* 50% */ 868 break; 869 case 3: 870 mft_zone_size = (mft_zone_size + 871 (mft_zone_size >> 1)) >> 2; /* 37.5% */ 872 break; 873 case 2: 874 mft_zone_size >>= 2; /* 25% */ 875 break; 876 /* case 1: */ 877 default: 878 mft_zone_size >>= 3; /* 12.5% */ 879 break; 880 } 881 /* Setup the mft zone. */ 882 vol->mft_zone_start = vol->mft_zone_pos = vol->mft_lcn; 883 ntfs_debug("vol->mft_zone_pos = 0x%llx", 884 (unsigned long long)vol->mft_zone_pos); 885 /* 886 * Calculate the mft_lcn for an unmodified NTFS volume (see mkntfs 887 * source) and if the actual mft_lcn is in the expected place or even 888 * further to the front of the volume, extend the mft_zone to cover the 889 * beginning of the volume as well. This is in order to protect the 890 * area reserved for the mft bitmap as well within the mft_zone itself. 891 * On non-standard volumes we do not protect it as the overhead would 892 * be higher than the speed increase we would get by doing it. 893 */ 894 mft_lcn = (8192 + 2 * vol->cluster_size - 1) / vol->cluster_size; 895 if (mft_lcn * vol->cluster_size < 16 * 1024) 896 mft_lcn = (16 * 1024 + vol->cluster_size - 1) / 897 vol->cluster_size; 898 if (vol->mft_zone_start <= mft_lcn) 899 vol->mft_zone_start = 0; 900 ntfs_debug("vol->mft_zone_start = 0x%llx", 901 (unsigned long long)vol->mft_zone_start); 902 /* 903 * Need to cap the mft zone on non-standard volumes so that it does 904 * not point outside the boundaries of the volume. We do this by 905 * halving the zone size until we are inside the volume. 906 */ 907 vol->mft_zone_end = vol->mft_lcn + mft_zone_size; 908 while (vol->mft_zone_end >= vol->nr_clusters) { 909 mft_zone_size >>= 1; 910 vol->mft_zone_end = vol->mft_lcn + mft_zone_size; 911 } 912 ntfs_debug("vol->mft_zone_end = 0x%llx", 913 (unsigned long long)vol->mft_zone_end); 914 /* 915 * Set the current position within each data zone to the start of the 916 * respective zone. 917 */ 918 vol->data1_zone_pos = vol->mft_zone_end; 919 ntfs_debug("vol->data1_zone_pos = 0x%llx", 920 (unsigned long long)vol->data1_zone_pos); 921 vol->data2_zone_pos = 0; 922 ntfs_debug("vol->data2_zone_pos = 0x%llx", 923 (unsigned long long)vol->data2_zone_pos); 924 925 /* Set the mft data allocation position to mft record 24. */ 926 vol->mft_data_pos = 24; 927 ntfs_debug("vol->mft_data_pos = 0x%llx", 928 (unsigned long long)vol->mft_data_pos); 929 #endif /* NTFS_RW */ 930 } 931 932 #ifdef NTFS_RW 933 934 /** 935 * load_and_init_mft_mirror - load and setup the mft mirror inode for a volume 936 * @vol: ntfs super block describing device whose mft mirror to load 937 * 938 * Return TRUE on success or FALSE on error. 939 */ 940 static BOOL load_and_init_mft_mirror(ntfs_volume *vol) 941 { 942 struct inode *tmp_ino; 943 ntfs_inode *tmp_ni; 944 945 ntfs_debug("Entering."); 946 /* Get mft mirror inode. */ 947 tmp_ino = ntfs_iget(vol->sb, FILE_MFTMirr); 948 if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { 949 if (!IS_ERR(tmp_ino)) 950 iput(tmp_ino); 951 /* Caller will display error message. */ 952 return FALSE; 953 } 954 /* 955 * Re-initialize some specifics about $MFTMirr's inode as 956 * ntfs_read_inode() will have set up the default ones. 957 */ 958 /* Set uid and gid to root. */ 959 tmp_ino->i_uid = tmp_ino->i_gid = 0; 960 /* Regular file. No access for anyone. */ 961 tmp_ino->i_mode = S_IFREG; 962 /* No VFS initiated operations allowed for $MFTMirr. */ 963 tmp_ino->i_op = &ntfs_empty_inode_ops; 964 tmp_ino->i_fop = &ntfs_empty_file_ops; 965 /* Put in our special address space operations. */ 966 tmp_ino->i_mapping->a_ops = &ntfs_mst_aops; 967 tmp_ni = NTFS_I(tmp_ino); 968 /* The $MFTMirr, like the $MFT is multi sector transfer protected. */ 969 NInoSetMstProtected(tmp_ni); 970 /* 971 * Set up our little cheat allowing us to reuse the async read io 972 * completion handler for directories. 973 */ 974 tmp_ni->itype.index.block_size = vol->mft_record_size; 975 tmp_ni->itype.index.block_size_bits = vol->mft_record_size_bits; 976 vol->mftmirr_ino = tmp_ino; 977 ntfs_debug("Done."); 978 return TRUE; 979 } 980 981 /** 982 * check_mft_mirror - compare contents of the mft mirror with the mft 983 * @vol: ntfs super block describing device whose mft mirror to check 984 * 985 * Return TRUE on success or FALSE on error. 986 * 987 * Note, this function also results in the mft mirror runlist being completely 988 * mapped into memory. The mft mirror write code requires this and will BUG() 989 * should it find an unmapped runlist element. 990 */ 991 static BOOL check_mft_mirror(ntfs_volume *vol) 992 { 993 unsigned long index; 994 struct super_block *sb = vol->sb; 995 ntfs_inode *mirr_ni; 996 struct page *mft_page, *mirr_page; 997 u8 *kmft, *kmirr; 998 runlist_element *rl, rl2[2]; 999 int mrecs_per_page, i; 1000 1001 ntfs_debug("Entering."); 1002 /* Compare contents of $MFT and $MFTMirr. */ 1003 mrecs_per_page = PAGE_CACHE_SIZE / vol->mft_record_size; 1004 BUG_ON(!mrecs_per_page); 1005 BUG_ON(!vol->mftmirr_size); 1006 mft_page = mirr_page = NULL; 1007 kmft = kmirr = NULL; 1008 index = i = 0; 1009 do { 1010 u32 bytes; 1011 1012 /* Switch pages if necessary. */ 1013 if (!(i % mrecs_per_page)) { 1014 if (index) { 1015 ntfs_unmap_page(mft_page); 1016 ntfs_unmap_page(mirr_page); 1017 } 1018 /* Get the $MFT page. */ 1019 mft_page = ntfs_map_page(vol->mft_ino->i_mapping, 1020 index); 1021 if (IS_ERR(mft_page)) { 1022 ntfs_error(sb, "Failed to read $MFT."); 1023 return FALSE; 1024 } 1025 kmft = page_address(mft_page); 1026 /* Get the $MFTMirr page. */ 1027 mirr_page = ntfs_map_page(vol->mftmirr_ino->i_mapping, 1028 index); 1029 if (IS_ERR(mirr_page)) { 1030 ntfs_error(sb, "Failed to read $MFTMirr."); 1031 goto mft_unmap_out; 1032 } 1033 kmirr = page_address(mirr_page); 1034 ++index; 1035 } 1036 /* Make sure the record is ok. */ 1037 if (ntfs_is_baad_recordp((le32*)kmft)) { 1038 ntfs_error(sb, "Incomplete multi sector transfer " 1039 "detected in mft record %i.", i); 1040 mm_unmap_out: 1041 ntfs_unmap_page(mirr_page); 1042 mft_unmap_out: 1043 ntfs_unmap_page(mft_page); 1044 return FALSE; 1045 } 1046 if (ntfs_is_baad_recordp((le32*)kmirr)) { 1047 ntfs_error(sb, "Incomplete multi sector transfer " 1048 "detected in mft mirror record %i.", i); 1049 goto mm_unmap_out; 1050 } 1051 /* Get the amount of data in the current record. */ 1052 bytes = le32_to_cpu(((MFT_RECORD*)kmft)->bytes_in_use); 1053 if (!bytes || bytes > vol->mft_record_size) { 1054 bytes = le32_to_cpu(((MFT_RECORD*)kmirr)->bytes_in_use); 1055 if (!bytes || bytes > vol->mft_record_size) 1056 bytes = vol->mft_record_size; 1057 } 1058 /* Compare the two records. */ 1059 if (memcmp(kmft, kmirr, bytes)) { 1060 ntfs_error(sb, "$MFT and $MFTMirr (record %i) do not " 1061 "match. Run ntfsfix or chkdsk.", i); 1062 goto mm_unmap_out; 1063 } 1064 kmft += vol->mft_record_size; 1065 kmirr += vol->mft_record_size; 1066 } while (++i < vol->mftmirr_size); 1067 /* Release the last pages. */ 1068 ntfs_unmap_page(mft_page); 1069 ntfs_unmap_page(mirr_page); 1070 1071 /* Construct the mft mirror runlist by hand. */ 1072 rl2[0].vcn = 0; 1073 rl2[0].lcn = vol->mftmirr_lcn; 1074 rl2[0].length = (vol->mftmirr_size * vol->mft_record_size + 1075 vol->cluster_size - 1) / vol->cluster_size; 1076 rl2[1].vcn = rl2[0].length; 1077 rl2[1].lcn = LCN_ENOENT; 1078 rl2[1].length = 0; 1079 /* 1080 * Because we have just read all of the mft mirror, we know we have 1081 * mapped the full runlist for it. 1082 */ 1083 mirr_ni = NTFS_I(vol->mftmirr_ino); 1084 down_read(&mirr_ni->runlist.lock); 1085 rl = mirr_ni->runlist.rl; 1086 /* Compare the two runlists. They must be identical. */ 1087 i = 0; 1088 do { 1089 if (rl2[i].vcn != rl[i].vcn || rl2[i].lcn != rl[i].lcn || 1090 rl2[i].length != rl[i].length) { 1091 ntfs_error(sb, "$MFTMirr location mismatch. " 1092 "Run chkdsk."); 1093 up_read(&mirr_ni->runlist.lock); 1094 return FALSE; 1095 } 1096 } while (rl2[i++].length); 1097 up_read(&mirr_ni->runlist.lock); 1098 ntfs_debug("Done."); 1099 return TRUE; 1100 } 1101 1102 /** 1103 * load_and_check_logfile - load and check the logfile inode for a volume 1104 * @vol: ntfs super block describing device whose logfile to load 1105 * 1106 * Return TRUE on success or FALSE on error. 1107 */ 1108 static BOOL load_and_check_logfile(ntfs_volume *vol) 1109 { 1110 struct inode *tmp_ino; 1111 1112 ntfs_debug("Entering."); 1113 tmp_ino = ntfs_iget(vol->sb, FILE_LogFile); 1114 if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { 1115 if (!IS_ERR(tmp_ino)) 1116 iput(tmp_ino); 1117 /* Caller will display error message. */ 1118 return FALSE; 1119 } 1120 if (!ntfs_check_logfile(tmp_ino)) { 1121 iput(tmp_ino); 1122 /* ntfs_check_logfile() will have displayed error output. */ 1123 return FALSE; 1124 } 1125 vol->logfile_ino = tmp_ino; 1126 ntfs_debug("Done."); 1127 return TRUE; 1128 } 1129 1130 /** 1131 * load_and_init_quota - load and setup the quota file for a volume if present 1132 * @vol: ntfs super block describing device whose quota file to load 1133 * 1134 * Return TRUE on success or FALSE on error. If $Quota is not present, we 1135 * leave vol->quota_ino as NULL and return success. 1136 */ 1137 static BOOL load_and_init_quota(ntfs_volume *vol) 1138 { 1139 MFT_REF mref; 1140 struct inode *tmp_ino; 1141 ntfs_name *name = NULL; 1142 static const ntfschar Quota[7] = { const_cpu_to_le16('$'), 1143 const_cpu_to_le16('Q'), const_cpu_to_le16('u'), 1144 const_cpu_to_le16('o'), const_cpu_to_le16('t'), 1145 const_cpu_to_le16('a'), 0 }; 1146 static ntfschar Q[3] = { const_cpu_to_le16('$'), 1147 const_cpu_to_le16('Q'), 0 }; 1148 1149 ntfs_debug("Entering."); 1150 /* 1151 * Find the inode number for the quota file by looking up the filename 1152 * $Quota in the extended system files directory $Extend. 1153 */ 1154 down(&vol->extend_ino->i_sem); 1155 mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), Quota, 6, 1156 &name); 1157 up(&vol->extend_ino->i_sem); 1158 if (IS_ERR_MREF(mref)) { 1159 /* 1160 * If the file does not exist, quotas are disabled and have 1161 * never been enabled on this volume, just return success. 1162 */ 1163 if (MREF_ERR(mref) == -ENOENT) { 1164 ntfs_debug("$Quota not present. Volume does not have " 1165 "quotas enabled."); 1166 /* 1167 * No need to try to set quotas out of date if they are 1168 * not enabled. 1169 */ 1170 NVolSetQuotaOutOfDate(vol); 1171 return TRUE; 1172 } 1173 /* A real error occured. */ 1174 ntfs_error(vol->sb, "Failed to find inode number for $Quota."); 1175 return FALSE; 1176 } 1177 /* We do not care for the type of match that was found. */ 1178 if (name) 1179 kfree(name); 1180 /* Get the inode. */ 1181 tmp_ino = ntfs_iget(vol->sb, MREF(mref)); 1182 if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { 1183 if (!IS_ERR(tmp_ino)) 1184 iput(tmp_ino); 1185 ntfs_error(vol->sb, "Failed to load $Quota."); 1186 return FALSE; 1187 } 1188 vol->quota_ino = tmp_ino; 1189 /* Get the $Q index allocation attribute. */ 1190 tmp_ino = ntfs_index_iget(vol->quota_ino, Q, 2); 1191 if (IS_ERR(tmp_ino)) { 1192 ntfs_error(vol->sb, "Failed to load $Quota/$Q index."); 1193 return FALSE; 1194 } 1195 vol->quota_q_ino = tmp_ino; 1196 ntfs_debug("Done."); 1197 return TRUE; 1198 } 1199 1200 /** 1201 * load_and_init_attrdef - load the attribute definitions table for a volume 1202 * @vol: ntfs super block describing device whose attrdef to load 1203 * 1204 * Return TRUE on success or FALSE on error. 1205 */ 1206 static BOOL load_and_init_attrdef(ntfs_volume *vol) 1207 { 1208 struct super_block *sb = vol->sb; 1209 struct inode *ino; 1210 struct page *page; 1211 unsigned long index, max_index; 1212 unsigned int size; 1213 1214 ntfs_debug("Entering."); 1215 /* Read attrdef table and setup vol->attrdef and vol->attrdef_size. */ 1216 ino = ntfs_iget(sb, FILE_AttrDef); 1217 if (IS_ERR(ino) || is_bad_inode(ino)) { 1218 if (!IS_ERR(ino)) 1219 iput(ino); 1220 goto failed; 1221 } 1222 /* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */ 1223 if (!ino->i_size || ino->i_size > 0x7fffffff) 1224 goto iput_failed; 1225 vol->attrdef = (ATTR_DEF*)ntfs_malloc_nofs(ino->i_size); 1226 if (!vol->attrdef) 1227 goto iput_failed; 1228 index = 0; 1229 max_index = ino->i_size >> PAGE_CACHE_SHIFT; 1230 size = PAGE_CACHE_SIZE; 1231 while (index < max_index) { 1232 /* Read the attrdef table and copy it into the linear buffer. */ 1233 read_partial_attrdef_page: 1234 page = ntfs_map_page(ino->i_mapping, index); 1235 if (IS_ERR(page)) 1236 goto free_iput_failed; 1237 memcpy((u8*)vol->attrdef + (index++ << PAGE_CACHE_SHIFT), 1238 page_address(page), size); 1239 ntfs_unmap_page(page); 1240 }; 1241 if (size == PAGE_CACHE_SIZE) { 1242 size = ino->i_size & ~PAGE_CACHE_MASK; 1243 if (size) 1244 goto read_partial_attrdef_page; 1245 } 1246 vol->attrdef_size = ino->i_size; 1247 ntfs_debug("Read %llu bytes from $AttrDef.", ino->i_size); 1248 iput(ino); 1249 return TRUE; 1250 free_iput_failed: 1251 ntfs_free(vol->attrdef); 1252 vol->attrdef = NULL; 1253 iput_failed: 1254 iput(ino); 1255 failed: 1256 ntfs_error(sb, "Failed to initialize attribute definition table."); 1257 return FALSE; 1258 } 1259 1260 #endif /* NTFS_RW */ 1261 1262 /** 1263 * load_and_init_upcase - load the upcase table for an ntfs volume 1264 * @vol: ntfs super block describing device whose upcase to load 1265 * 1266 * Return TRUE on success or FALSE on error. 1267 */ 1268 static BOOL load_and_init_upcase(ntfs_volume *vol) 1269 { 1270 struct super_block *sb = vol->sb; 1271 struct inode *ino; 1272 struct page *page; 1273 unsigned long index, max_index; 1274 unsigned int size; 1275 int i, max; 1276 1277 ntfs_debug("Entering."); 1278 /* Read upcase table and setup vol->upcase and vol->upcase_len. */ 1279 ino = ntfs_iget(sb, FILE_UpCase); 1280 if (IS_ERR(ino) || is_bad_inode(ino)) { 1281 if (!IS_ERR(ino)) 1282 iput(ino); 1283 goto upcase_failed; 1284 } 1285 /* 1286 * The upcase size must not be above 64k Unicode characters, must not 1287 * be zero and must be a multiple of sizeof(ntfschar). 1288 */ 1289 if (!ino->i_size || ino->i_size & (sizeof(ntfschar) - 1) || 1290 ino->i_size > 64ULL * 1024 * sizeof(ntfschar)) 1291 goto iput_upcase_failed; 1292 vol->upcase = (ntfschar*)ntfs_malloc_nofs(ino->i_size); 1293 if (!vol->upcase) 1294 goto iput_upcase_failed; 1295 index = 0; 1296 max_index = ino->i_size >> PAGE_CACHE_SHIFT; 1297 size = PAGE_CACHE_SIZE; 1298 while (index < max_index) { 1299 /* Read the upcase table and copy it into the linear buffer. */ 1300 read_partial_upcase_page: 1301 page = ntfs_map_page(ino->i_mapping, index); 1302 if (IS_ERR(page)) 1303 goto iput_upcase_failed; 1304 memcpy((char*)vol->upcase + (index++ << PAGE_CACHE_SHIFT), 1305 page_address(page), size); 1306 ntfs_unmap_page(page); 1307 }; 1308 if (size == PAGE_CACHE_SIZE) { 1309 size = ino->i_size & ~PAGE_CACHE_MASK; 1310 if (size) 1311 goto read_partial_upcase_page; 1312 } 1313 vol->upcase_len = ino->i_size >> UCHAR_T_SIZE_BITS; 1314 ntfs_debug("Read %llu bytes from $UpCase (expected %zu bytes).", 1315 ino->i_size, 64 * 1024 * sizeof(ntfschar)); 1316 iput(ino); 1317 down(&ntfs_lock); 1318 if (!default_upcase) { 1319 ntfs_debug("Using volume specified $UpCase since default is " 1320 "not present."); 1321 up(&ntfs_lock); 1322 return TRUE; 1323 } 1324 max = default_upcase_len; 1325 if (max > vol->upcase_len) 1326 max = vol->upcase_len; 1327 for (i = 0; i < max; i++) 1328 if (vol->upcase[i] != default_upcase[i]) 1329 break; 1330 if (i == max) { 1331 ntfs_free(vol->upcase); 1332 vol->upcase = default_upcase; 1333 vol->upcase_len = max; 1334 ntfs_nr_upcase_users++; 1335 up(&ntfs_lock); 1336 ntfs_debug("Volume specified $UpCase matches default. Using " 1337 "default."); 1338 return TRUE; 1339 } 1340 up(&ntfs_lock); 1341 ntfs_debug("Using volume specified $UpCase since it does not match " 1342 "the default."); 1343 return TRUE; 1344 iput_upcase_failed: 1345 iput(ino); 1346 ntfs_free(vol->upcase); 1347 vol->upcase = NULL; 1348 upcase_failed: 1349 down(&ntfs_lock); 1350 if (default_upcase) { 1351 vol->upcase = default_upcase; 1352 vol->upcase_len = default_upcase_len; 1353 ntfs_nr_upcase_users++; 1354 up(&ntfs_lock); 1355 ntfs_error(sb, "Failed to load $UpCase from the volume. Using " 1356 "default."); 1357 return TRUE; 1358 } 1359 up(&ntfs_lock); 1360 ntfs_error(sb, "Failed to initialize upcase table."); 1361 return FALSE; 1362 } 1363 1364 /** 1365 * load_system_files - open the system files using normal functions 1366 * @vol: ntfs super block describing device whose system files to load 1367 * 1368 * Open the system files with normal access functions and complete setting up 1369 * the ntfs super block @vol. 1370 * 1371 * Return TRUE on success or FALSE on error. 1372 */ 1373 static BOOL load_system_files(ntfs_volume *vol) 1374 { 1375 struct super_block *sb = vol->sb; 1376 MFT_RECORD *m; 1377 VOLUME_INFORMATION *vi; 1378 ntfs_attr_search_ctx *ctx; 1379 1380 ntfs_debug("Entering."); 1381 #ifdef NTFS_RW 1382 /* Get mft mirror inode compare the contents of $MFT and $MFTMirr. */ 1383 if (!load_and_init_mft_mirror(vol) || !check_mft_mirror(vol)) { 1384 static const char *es1 = "Failed to load $MFTMirr"; 1385 static const char *es2 = "$MFTMirr does not match $MFT"; 1386 static const char *es3 = ". Run ntfsfix and/or chkdsk."; 1387 1388 /* If a read-write mount, convert it to a read-only mount. */ 1389 if (!(sb->s_flags & MS_RDONLY)) { 1390 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 1391 ON_ERRORS_CONTINUE))) { 1392 ntfs_error(sb, "%s and neither on_errors=" 1393 "continue nor on_errors=" 1394 "remount-ro was specified%s", 1395 !vol->mftmirr_ino ? es1 : es2, 1396 es3); 1397 goto iput_mirr_err_out; 1398 } 1399 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; 1400 ntfs_error(sb, "%s. Mounting read-only%s", 1401 !vol->mftmirr_ino ? es1 : es2, es3); 1402 } else 1403 ntfs_warning(sb, "%s. Will not be able to remount " 1404 "read-write%s", 1405 !vol->mftmirr_ino ? es1 : es2, es3); 1406 /* This will prevent a read-write remount. */ 1407 NVolSetErrors(vol); 1408 } 1409 #endif /* NTFS_RW */ 1410 /* Get mft bitmap attribute inode. */ 1411 vol->mftbmp_ino = ntfs_attr_iget(vol->mft_ino, AT_BITMAP, NULL, 0); 1412 if (IS_ERR(vol->mftbmp_ino)) { 1413 ntfs_error(sb, "Failed to load $MFT/$BITMAP attribute."); 1414 goto iput_mirr_err_out; 1415 } 1416 /* Read upcase table and setup @vol->upcase and @vol->upcase_len. */ 1417 if (!load_and_init_upcase(vol)) 1418 goto iput_mftbmp_err_out; 1419 #ifdef NTFS_RW 1420 /* 1421 * Read attribute definitions table and setup @vol->attrdef and 1422 * @vol->attrdef_size. 1423 */ 1424 if (!load_and_init_attrdef(vol)) 1425 goto iput_upcase_err_out; 1426 #endif /* NTFS_RW */ 1427 /* 1428 * Get the cluster allocation bitmap inode and verify the size, no 1429 * need for any locking at this stage as we are already running 1430 * exclusively as we are mount in progress task. 1431 */ 1432 vol->lcnbmp_ino = ntfs_iget(sb, FILE_Bitmap); 1433 if (IS_ERR(vol->lcnbmp_ino) || is_bad_inode(vol->lcnbmp_ino)) { 1434 if (!IS_ERR(vol->lcnbmp_ino)) 1435 iput(vol->lcnbmp_ino); 1436 goto bitmap_failed; 1437 } 1438 if ((vol->nr_clusters + 7) >> 3 > vol->lcnbmp_ino->i_size) { 1439 iput(vol->lcnbmp_ino); 1440 bitmap_failed: 1441 ntfs_error(sb, "Failed to load $Bitmap."); 1442 goto iput_attrdef_err_out; 1443 } 1444 /* 1445 * Get the volume inode and setup our cache of the volume flags and 1446 * version. 1447 */ 1448 vol->vol_ino = ntfs_iget(sb, FILE_Volume); 1449 if (IS_ERR(vol->vol_ino) || is_bad_inode(vol->vol_ino)) { 1450 if (!IS_ERR(vol->vol_ino)) 1451 iput(vol->vol_ino); 1452 volume_failed: 1453 ntfs_error(sb, "Failed to load $Volume."); 1454 goto iput_lcnbmp_err_out; 1455 } 1456 m = map_mft_record(NTFS_I(vol->vol_ino)); 1457 if (IS_ERR(m)) { 1458 iput_volume_failed: 1459 iput(vol->vol_ino); 1460 goto volume_failed; 1461 } 1462 if (!(ctx = ntfs_attr_get_search_ctx(NTFS_I(vol->vol_ino), m))) { 1463 ntfs_error(sb, "Failed to get attribute search context."); 1464 goto get_ctx_vol_failed; 1465 } 1466 if (ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0, 1467 ctx) || ctx->attr->non_resident || ctx->attr->flags) { 1468 err_put_vol: 1469 ntfs_attr_put_search_ctx(ctx); 1470 get_ctx_vol_failed: 1471 unmap_mft_record(NTFS_I(vol->vol_ino)); 1472 goto iput_volume_failed; 1473 } 1474 vi = (VOLUME_INFORMATION*)((char*)ctx->attr + 1475 le16_to_cpu(ctx->attr->data.resident.value_offset)); 1476 /* Some bounds checks. */ 1477 if ((u8*)vi < (u8*)ctx->attr || (u8*)vi + 1478 le32_to_cpu(ctx->attr->data.resident.value_length) > 1479 (u8*)ctx->attr + le32_to_cpu(ctx->attr->length)) 1480 goto err_put_vol; 1481 /* Copy the volume flags and version to the ntfs_volume structure. */ 1482 vol->vol_flags = vi->flags; 1483 vol->major_ver = vi->major_ver; 1484 vol->minor_ver = vi->minor_ver; 1485 ntfs_attr_put_search_ctx(ctx); 1486 unmap_mft_record(NTFS_I(vol->vol_ino)); 1487 printk(KERN_INFO "NTFS volume version %i.%i.\n", vol->major_ver, 1488 vol->minor_ver); 1489 #ifdef NTFS_RW 1490 /* Make sure that no unsupported volume flags are set. */ 1491 if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { 1492 static const char *es1a = "Volume is dirty"; 1493 static const char *es1b = "Volume has unsupported flags set"; 1494 static const char *es2 = ". Run chkdsk and mount in Windows."; 1495 const char *es1; 1496 1497 es1 = vol->vol_flags & VOLUME_IS_DIRTY ? es1a : es1b; 1498 /* If a read-write mount, convert it to a read-only mount. */ 1499 if (!(sb->s_flags & MS_RDONLY)) { 1500 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 1501 ON_ERRORS_CONTINUE))) { 1502 ntfs_error(sb, "%s and neither on_errors=" 1503 "continue nor on_errors=" 1504 "remount-ro was specified%s", 1505 es1, es2); 1506 goto iput_vol_err_out; 1507 } 1508 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; 1509 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 1510 } else 1511 ntfs_warning(sb, "%s. Will not be able to remount " 1512 "read-write%s", es1, es2); 1513 /* 1514 * Do not set NVolErrors() because ntfs_remount() re-checks the 1515 * flags which we need to do in case any flags have changed. 1516 */ 1517 } 1518 /* 1519 * Get the inode for the logfile, check it and determine if the volume 1520 * was shutdown cleanly. 1521 */ 1522 if (!load_and_check_logfile(vol) || 1523 !ntfs_is_logfile_clean(vol->logfile_ino)) { 1524 static const char *es1a = "Failed to load $LogFile"; 1525 static const char *es1b = "$LogFile is not clean"; 1526 static const char *es2 = ". Mount in Windows."; 1527 const char *es1; 1528 1529 es1 = !vol->logfile_ino ? es1a : es1b; 1530 /* If a read-write mount, convert it to a read-only mount. */ 1531 if (!(sb->s_flags & MS_RDONLY)) { 1532 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 1533 ON_ERRORS_CONTINUE))) { 1534 ntfs_error(sb, "%s and neither on_errors=" 1535 "continue nor on_errors=" 1536 "remount-ro was specified%s", 1537 es1, es2); 1538 goto iput_logfile_err_out; 1539 } 1540 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; 1541 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 1542 } else 1543 ntfs_warning(sb, "%s. Will not be able to remount " 1544 "read-write%s", es1, es2); 1545 /* This will prevent a read-write remount. */ 1546 NVolSetErrors(vol); 1547 } 1548 /* If (still) a read-write mount, mark the volume dirty. */ 1549 if (!(sb->s_flags & MS_RDONLY) && 1550 ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) { 1551 static const char *es1 = "Failed to set dirty bit in volume " 1552 "information flags"; 1553 static const char *es2 = ". Run chkdsk."; 1554 1555 /* Convert to a read-only mount. */ 1556 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 1557 ON_ERRORS_CONTINUE))) { 1558 ntfs_error(sb, "%s and neither on_errors=continue nor " 1559 "on_errors=remount-ro was specified%s", 1560 es1, es2); 1561 goto iput_logfile_err_out; 1562 } 1563 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 1564 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; 1565 /* 1566 * Do not set NVolErrors() because ntfs_remount() might manage 1567 * to set the dirty flag in which case all would be well. 1568 */ 1569 } 1570 #if 0 1571 // TODO: Enable this code once we start modifying anything that is 1572 // different between NTFS 1.2 and 3.x... 1573 /* 1574 * If (still) a read-write mount, set the NT4 compatibility flag on 1575 * newer NTFS version volumes. 1576 */ 1577 if (!(sb->s_flags & MS_RDONLY) && (vol->major_ver > 1) && 1578 ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) { 1579 static const char *es1 = "Failed to set NT4 compatibility flag"; 1580 static const char *es2 = ". Run chkdsk."; 1581 1582 /* Convert to a read-only mount. */ 1583 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 1584 ON_ERRORS_CONTINUE))) { 1585 ntfs_error(sb, "%s and neither on_errors=continue nor " 1586 "on_errors=remount-ro was specified%s", 1587 es1, es2); 1588 goto iput_logfile_err_out; 1589 } 1590 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 1591 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; 1592 NVolSetErrors(vol); 1593 } 1594 #endif 1595 /* If (still) a read-write mount, empty the logfile. */ 1596 if (!(sb->s_flags & MS_RDONLY) && 1597 !ntfs_empty_logfile(vol->logfile_ino)) { 1598 static const char *es1 = "Failed to empty $LogFile"; 1599 static const char *es2 = ". Mount in Windows."; 1600 1601 /* Convert to a read-only mount. */ 1602 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 1603 ON_ERRORS_CONTINUE))) { 1604 ntfs_error(sb, "%s and neither on_errors=continue nor " 1605 "on_errors=remount-ro was specified%s", 1606 es1, es2); 1607 goto iput_logfile_err_out; 1608 } 1609 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 1610 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; 1611 NVolSetErrors(vol); 1612 } 1613 #endif /* NTFS_RW */ 1614 /* Get the root directory inode. */ 1615 vol->root_ino = ntfs_iget(sb, FILE_root); 1616 if (IS_ERR(vol->root_ino) || is_bad_inode(vol->root_ino)) { 1617 if (!IS_ERR(vol->root_ino)) 1618 iput(vol->root_ino); 1619 ntfs_error(sb, "Failed to load root directory."); 1620 goto iput_logfile_err_out; 1621 } 1622 /* If on NTFS versions before 3.0, we are done. */ 1623 if (vol->major_ver < 3) 1624 return TRUE; 1625 /* NTFS 3.0+ specific initialization. */ 1626 /* Get the security descriptors inode. */ 1627 vol->secure_ino = ntfs_iget(sb, FILE_Secure); 1628 if (IS_ERR(vol->secure_ino) || is_bad_inode(vol->secure_ino)) { 1629 if (!IS_ERR(vol->secure_ino)) 1630 iput(vol->secure_ino); 1631 ntfs_error(sb, "Failed to load $Secure."); 1632 goto iput_root_err_out; 1633 } 1634 // FIXME: Initialize security. 1635 /* Get the extended system files' directory inode. */ 1636 vol->extend_ino = ntfs_iget(sb, FILE_Extend); 1637 if (IS_ERR(vol->extend_ino) || is_bad_inode(vol->extend_ino)) { 1638 if (!IS_ERR(vol->extend_ino)) 1639 iput(vol->extend_ino); 1640 ntfs_error(sb, "Failed to load $Extend."); 1641 goto iput_sec_err_out; 1642 } 1643 #ifdef NTFS_RW 1644 /* Find the quota file, load it if present, and set it up. */ 1645 if (!load_and_init_quota(vol)) { 1646 static const char *es1 = "Failed to load $Quota"; 1647 static const char *es2 = ". Run chkdsk."; 1648 1649 /* If a read-write mount, convert it to a read-only mount. */ 1650 if (!(sb->s_flags & MS_RDONLY)) { 1651 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 1652 ON_ERRORS_CONTINUE))) { 1653 ntfs_error(sb, "%s and neither on_errors=" 1654 "continue nor on_errors=" 1655 "remount-ro was specified%s", 1656 es1, es2); 1657 goto iput_quota_err_out; 1658 } 1659 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; 1660 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 1661 } else 1662 ntfs_warning(sb, "%s. Will not be able to remount " 1663 "read-write%s", es1, es2); 1664 /* This will prevent a read-write remount. */ 1665 NVolSetErrors(vol); 1666 } 1667 /* If (still) a read-write mount, mark the quotas out of date. */ 1668 if (!(sb->s_flags & MS_RDONLY) && 1669 !ntfs_mark_quotas_out_of_date(vol)) { 1670 static const char *es1 = "Failed to mark quotas out of date"; 1671 static const char *es2 = ". Run chkdsk."; 1672 1673 /* Convert to a read-only mount. */ 1674 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | 1675 ON_ERRORS_CONTINUE))) { 1676 ntfs_error(sb, "%s and neither on_errors=continue nor " 1677 "on_errors=remount-ro was specified%s", 1678 es1, es2); 1679 goto iput_quota_err_out; 1680 } 1681 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); 1682 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; 1683 NVolSetErrors(vol); 1684 } 1685 // TODO: Delete or checkpoint the $UsnJrnl if it exists. 1686 #endif /* NTFS_RW */ 1687 return TRUE; 1688 #ifdef NTFS_RW 1689 iput_quota_err_out: 1690 if (vol->quota_q_ino) 1691 iput(vol->quota_q_ino); 1692 if (vol->quota_ino) 1693 iput(vol->quota_ino); 1694 iput(vol->extend_ino); 1695 #endif /* NTFS_RW */ 1696 iput_sec_err_out: 1697 iput(vol->secure_ino); 1698 iput_root_err_out: 1699 iput(vol->root_ino); 1700 iput_logfile_err_out: 1701 #ifdef NTFS_RW 1702 if (vol->logfile_ino) 1703 iput(vol->logfile_ino); 1704 iput_vol_err_out: 1705 #endif /* NTFS_RW */ 1706 iput(vol->vol_ino); 1707 iput_lcnbmp_err_out: 1708 iput(vol->lcnbmp_ino); 1709 iput_attrdef_err_out: 1710 vol->attrdef_size = 0; 1711 if (vol->attrdef) { 1712 ntfs_free(vol->attrdef); 1713 vol->attrdef = NULL; 1714 } 1715 #ifdef NTFS_RW 1716 iput_upcase_err_out: 1717 #endif /* NTFS_RW */ 1718 vol->upcase_len = 0; 1719 down(&ntfs_lock); 1720 if (vol->upcase == default_upcase) { 1721 ntfs_nr_upcase_users--; 1722 vol->upcase = NULL; 1723 } 1724 up(&ntfs_lock); 1725 if (vol->upcase) { 1726 ntfs_free(vol->upcase); 1727 vol->upcase = NULL; 1728 } 1729 iput_mftbmp_err_out: 1730 iput(vol->mftbmp_ino); 1731 iput_mirr_err_out: 1732 #ifdef NTFS_RW 1733 if (vol->mftmirr_ino) 1734 iput(vol->mftmirr_ino); 1735 #endif /* NTFS_RW */ 1736 return FALSE; 1737 } 1738 1739 /** 1740 * ntfs_put_super - called by the vfs to unmount a volume 1741 * @sb: vfs superblock of volume to unmount 1742 * 1743 * ntfs_put_super() is called by the VFS (from fs/super.c::do_umount()) when 1744 * the volume is being unmounted (umount system call has been invoked) and it 1745 * releases all inodes and memory belonging to the NTFS specific part of the 1746 * super block. 1747 */ 1748 static void ntfs_put_super(struct super_block *sb) 1749 { 1750 ntfs_volume *vol = NTFS_SB(sb); 1751 1752 ntfs_debug("Entering."); 1753 #ifdef NTFS_RW 1754 /* 1755 * Commit all inodes while they are still open in case some of them 1756 * cause others to be dirtied. 1757 */ 1758 ntfs_commit_inode(vol->vol_ino); 1759 1760 /* NTFS 3.0+ specific. */ 1761 if (vol->major_ver >= 3) { 1762 if (vol->quota_q_ino) 1763 ntfs_commit_inode(vol->quota_q_ino); 1764 if (vol->quota_ino) 1765 ntfs_commit_inode(vol->quota_ino); 1766 if (vol->extend_ino) 1767 ntfs_commit_inode(vol->extend_ino); 1768 if (vol->secure_ino) 1769 ntfs_commit_inode(vol->secure_ino); 1770 } 1771 1772 ntfs_commit_inode(vol->root_ino); 1773 1774 down_write(&vol->lcnbmp_lock); 1775 ntfs_commit_inode(vol->lcnbmp_ino); 1776 up_write(&vol->lcnbmp_lock); 1777 1778 down_write(&vol->mftbmp_lock); 1779 ntfs_commit_inode(vol->mftbmp_ino); 1780 up_write(&vol->mftbmp_lock); 1781 1782 if (vol->logfile_ino) 1783 ntfs_commit_inode(vol->logfile_ino); 1784 1785 if (vol->mftmirr_ino) 1786 ntfs_commit_inode(vol->mftmirr_ino); 1787 ntfs_commit_inode(vol->mft_ino); 1788 1789 /* 1790 * If a read-write mount and no volume errors have occured, mark the 1791 * volume clean. Also, re-commit all affected inodes. 1792 */ 1793 if (!(sb->s_flags & MS_RDONLY)) { 1794 if (!NVolErrors(vol)) { 1795 if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY)) 1796 ntfs_warning(sb, "Failed to clear dirty bit " 1797 "in volume information " 1798 "flags. Run chkdsk."); 1799 ntfs_commit_inode(vol->vol_ino); 1800 ntfs_commit_inode(vol->root_ino); 1801 if (vol->mftmirr_ino) 1802 ntfs_commit_inode(vol->mftmirr_ino); 1803 ntfs_commit_inode(vol->mft_ino); 1804 } else { 1805 ntfs_warning(sb, "Volume has errors. Leaving volume " 1806 "marked dirty. Run chkdsk."); 1807 } 1808 } 1809 #endif /* NTFS_RW */ 1810 1811 iput(vol->vol_ino); 1812 vol->vol_ino = NULL; 1813 1814 /* NTFS 3.0+ specific clean up. */ 1815 if (vol->major_ver >= 3) { 1816 #ifdef NTFS_RW 1817 if (vol->quota_q_ino) { 1818 iput(vol->quota_q_ino); 1819 vol->quota_q_ino = NULL; 1820 } 1821 if (vol->quota_ino) { 1822 iput(vol->quota_ino); 1823 vol->quota_ino = NULL; 1824 } 1825 #endif /* NTFS_RW */ 1826 if (vol->extend_ino) { 1827 iput(vol->extend_ino); 1828 vol->extend_ino = NULL; 1829 } 1830 if (vol->secure_ino) { 1831 iput(vol->secure_ino); 1832 vol->secure_ino = NULL; 1833 } 1834 } 1835 1836 iput(vol->root_ino); 1837 vol->root_ino = NULL; 1838 1839 down_write(&vol->lcnbmp_lock); 1840 iput(vol->lcnbmp_ino); 1841 vol->lcnbmp_ino = NULL; 1842 up_write(&vol->lcnbmp_lock); 1843 1844 down_write(&vol->mftbmp_lock); 1845 iput(vol->mftbmp_ino); 1846 vol->mftbmp_ino = NULL; 1847 up_write(&vol->mftbmp_lock); 1848 1849 #ifdef NTFS_RW 1850 if (vol->logfile_ino) { 1851 iput(vol->logfile_ino); 1852 vol->logfile_ino = NULL; 1853 } 1854 if (vol->mftmirr_ino) { 1855 /* Re-commit the mft mirror and mft just in case. */ 1856 ntfs_commit_inode(vol->mftmirr_ino); 1857 ntfs_commit_inode(vol->mft_ino); 1858 iput(vol->mftmirr_ino); 1859 vol->mftmirr_ino = NULL; 1860 } 1861 /* 1862 * If any dirty inodes are left, throw away all mft data page cache 1863 * pages to allow a clean umount. This should never happen any more 1864 * due to mft.c::ntfs_mft_writepage() cleaning all the dirty pages as 1865 * the underlying mft records are written out and cleaned. If it does, 1866 * happen anyway, we want to know... 1867 */ 1868 ntfs_commit_inode(vol->mft_ino); 1869 write_inode_now(vol->mft_ino, 1); 1870 if (!list_empty(&sb->s_dirty)) { 1871 const char *s1, *s2; 1872 1873 down(&vol->mft_ino->i_sem); 1874 truncate_inode_pages(vol->mft_ino->i_mapping, 0); 1875 up(&vol->mft_ino->i_sem); 1876 write_inode_now(vol->mft_ino, 1); 1877 if (!list_empty(&sb->s_dirty)) { 1878 static const char *_s1 = "inodes"; 1879 static const char *_s2 = ""; 1880 s1 = _s1; 1881 s2 = _s2; 1882 } else { 1883 static const char *_s1 = "mft pages"; 1884 static const char *_s2 = "They have been thrown " 1885 "away. "; 1886 s1 = _s1; 1887 s2 = _s2; 1888 } 1889 ntfs_error(sb, "Dirty %s found at umount time. %sYou should " 1890 "run chkdsk. Please email " 1891 "linux-ntfs-dev@lists.sourceforge.net and say " 1892 "that you saw this message. Thank you.", s1, 1893 s2); 1894 } 1895 #endif /* NTFS_RW */ 1896 1897 iput(vol->mft_ino); 1898 vol->mft_ino = NULL; 1899 1900 /* Throw away the table of attribute definitions. */ 1901 vol->attrdef_size = 0; 1902 if (vol->attrdef) { 1903 ntfs_free(vol->attrdef); 1904 vol->attrdef = NULL; 1905 } 1906 vol->upcase_len = 0; 1907 /* 1908 * Destroy the global default upcase table if necessary. Also decrease 1909 * the number of upcase users if we are a user. 1910 */ 1911 down(&ntfs_lock); 1912 if (vol->upcase == default_upcase) { 1913 ntfs_nr_upcase_users--; 1914 vol->upcase = NULL; 1915 } 1916 if (!ntfs_nr_upcase_users && default_upcase) { 1917 ntfs_free(default_upcase); 1918 default_upcase = NULL; 1919 } 1920 if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users) 1921 free_compression_buffers(); 1922 up(&ntfs_lock); 1923 if (vol->upcase) { 1924 ntfs_free(vol->upcase); 1925 vol->upcase = NULL; 1926 } 1927 if (vol->nls_map) { 1928 unload_nls(vol->nls_map); 1929 vol->nls_map = NULL; 1930 } 1931 sb->s_fs_info = NULL; 1932 kfree(vol); 1933 return; 1934 } 1935 1936 /** 1937 * get_nr_free_clusters - return the number of free clusters on a volume 1938 * @vol: ntfs volume for which to obtain free cluster count 1939 * 1940 * Calculate the number of free clusters on the mounted NTFS volume @vol. We 1941 * actually calculate the number of clusters in use instead because this 1942 * allows us to not care about partial pages as these will be just zero filled 1943 * and hence not be counted as allocated clusters. 1944 * 1945 * The only particularity is that clusters beyond the end of the logical ntfs 1946 * volume will be marked as allocated to prevent errors which means we have to 1947 * discount those at the end. This is important as the cluster bitmap always 1948 * has a size in multiples of 8 bytes, i.e. up to 63 clusters could be outside 1949 * the logical volume and marked in use when they are not as they do not exist. 1950 * 1951 * If any pages cannot be read we assume all clusters in the erroring pages are 1952 * in use. This means we return an underestimate on errors which is better than 1953 * an overestimate. 1954 */ 1955 static s64 get_nr_free_clusters(ntfs_volume *vol) 1956 { 1957 s64 nr_free = vol->nr_clusters; 1958 u32 *kaddr; 1959 struct address_space *mapping = vol->lcnbmp_ino->i_mapping; 1960 filler_t *readpage = (filler_t*)mapping->a_ops->readpage; 1961 struct page *page; 1962 unsigned long index, max_index; 1963 unsigned int max_size; 1964 1965 ntfs_debug("Entering."); 1966 /* Serialize accesses to the cluster bitmap. */ 1967 down_read(&vol->lcnbmp_lock); 1968 /* 1969 * Convert the number of bits into bytes rounded up, then convert into 1970 * multiples of PAGE_CACHE_SIZE, rounding up so that if we have one 1971 * full and one partial page max_index = 2. 1972 */ 1973 max_index = (((vol->nr_clusters + 7) >> 3) + PAGE_CACHE_SIZE - 1) >> 1974 PAGE_CACHE_SHIFT; 1975 /* Use multiples of 4 bytes. */ 1976 max_size = PAGE_CACHE_SIZE >> 2; 1977 ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%x.", 1978 max_index, max_size); 1979 for (index = 0UL; index < max_index; index++) { 1980 unsigned int i; 1981 /* 1982 * Read the page from page cache, getting it from backing store 1983 * if necessary, and increment the use count. 1984 */ 1985 page = read_cache_page(mapping, index, (filler_t*)readpage, 1986 NULL); 1987 /* Ignore pages which errored synchronously. */ 1988 if (IS_ERR(page)) { 1989 ntfs_debug("Sync read_cache_page() error. Skipping " 1990 "page (index 0x%lx).", index); 1991 nr_free -= PAGE_CACHE_SIZE * 8; 1992 continue; 1993 } 1994 wait_on_page_locked(page); 1995 /* Ignore pages which errored asynchronously. */ 1996 if (!PageUptodate(page)) { 1997 ntfs_debug("Async read_cache_page() error. Skipping " 1998 "page (index 0x%lx).", index); 1999 page_cache_release(page); 2000 nr_free -= PAGE_CACHE_SIZE * 8; 2001 continue; 2002 } 2003 kaddr = (u32*)kmap_atomic(page, KM_USER0); 2004 /* 2005 * For each 4 bytes, subtract the number of set bits. If this 2006 * is the last page and it is partial we don't really care as 2007 * it just means we do a little extra work but it won't affect 2008 * the result as all out of range bytes are set to zero by 2009 * ntfs_readpage(). 2010 */ 2011 for (i = 0; i < max_size; i++) 2012 nr_free -= (s64)hweight32(kaddr[i]); 2013 kunmap_atomic(kaddr, KM_USER0); 2014 page_cache_release(page); 2015 } 2016 ntfs_debug("Finished reading $Bitmap, last index = 0x%lx.", index - 1); 2017 /* 2018 * Fixup for eventual bits outside logical ntfs volume (see function 2019 * description above). 2020 */ 2021 if (vol->nr_clusters & 63) 2022 nr_free += 64 - (vol->nr_clusters & 63); 2023 up_read(&vol->lcnbmp_lock); 2024 /* If errors occured we may well have gone below zero, fix this. */ 2025 if (nr_free < 0) 2026 nr_free = 0; 2027 ntfs_debug("Exiting."); 2028 return nr_free; 2029 } 2030 2031 /** 2032 * __get_nr_free_mft_records - return the number of free inodes on a volume 2033 * @vol: ntfs volume for which to obtain free inode count 2034 * 2035 * Calculate the number of free mft records (inodes) on the mounted NTFS 2036 * volume @vol. We actually calculate the number of mft records in use instead 2037 * because this allows us to not care about partial pages as these will be just 2038 * zero filled and hence not be counted as allocated mft record. 2039 * 2040 * If any pages cannot be read we assume all mft records in the erroring pages 2041 * are in use. This means we return an underestimate on errors which is better 2042 * than an overestimate. 2043 * 2044 * NOTE: Caller must hold mftbmp_lock rw_semaphore for reading or writing. 2045 */ 2046 static unsigned long __get_nr_free_mft_records(ntfs_volume *vol) 2047 { 2048 s64 nr_free; 2049 u32 *kaddr; 2050 struct address_space *mapping = vol->mftbmp_ino->i_mapping; 2051 filler_t *readpage = (filler_t*)mapping->a_ops->readpage; 2052 struct page *page; 2053 unsigned long index, max_index; 2054 unsigned int max_size; 2055 2056 ntfs_debug("Entering."); 2057 /* Number of mft records in file system (at this point in time). */ 2058 nr_free = vol->mft_ino->i_size >> vol->mft_record_size_bits; 2059 /* 2060 * Convert the maximum number of set bits into bytes rounded up, then 2061 * convert into multiples of PAGE_CACHE_SIZE, rounding up so that if we 2062 * have one full and one partial page max_index = 2. 2063 */ 2064 max_index = ((((NTFS_I(vol->mft_ino)->initialized_size >> 2065 vol->mft_record_size_bits) + 7) >> 3) + 2066 PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 2067 /* Use multiples of 4 bytes. */ 2068 max_size = PAGE_CACHE_SIZE >> 2; 2069 ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = " 2070 "0x%x.", max_index, max_size); 2071 for (index = 0UL; index < max_index; index++) { 2072 unsigned int i; 2073 /* 2074 * Read the page from page cache, getting it from backing store 2075 * if necessary, and increment the use count. 2076 */ 2077 page = read_cache_page(mapping, index, (filler_t*)readpage, 2078 NULL); 2079 /* Ignore pages which errored synchronously. */ 2080 if (IS_ERR(page)) { 2081 ntfs_debug("Sync read_cache_page() error. Skipping " 2082 "page (index 0x%lx).", index); 2083 nr_free -= PAGE_CACHE_SIZE * 8; 2084 continue; 2085 } 2086 wait_on_page_locked(page); 2087 /* Ignore pages which errored asynchronously. */ 2088 if (!PageUptodate(page)) { 2089 ntfs_debug("Async read_cache_page() error. Skipping " 2090 "page (index 0x%lx).", index); 2091 page_cache_release(page); 2092 nr_free -= PAGE_CACHE_SIZE * 8; 2093 continue; 2094 } 2095 kaddr = (u32*)kmap_atomic(page, KM_USER0); 2096 /* 2097 * For each 4 bytes, subtract the number of set bits. If this 2098 * is the last page and it is partial we don't really care as 2099 * it just means we do a little extra work but it won't affect 2100 * the result as all out of range bytes are set to zero by 2101 * ntfs_readpage(). 2102 */ 2103 for (i = 0; i < max_size; i++) 2104 nr_free -= (s64)hweight32(kaddr[i]); 2105 kunmap_atomic(kaddr, KM_USER0); 2106 page_cache_release(page); 2107 } 2108 ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx.", 2109 index - 1); 2110 /* If errors occured we may well have gone below zero, fix this. */ 2111 if (nr_free < 0) 2112 nr_free = 0; 2113 ntfs_debug("Exiting."); 2114 return nr_free; 2115 } 2116 2117 /** 2118 * ntfs_statfs - return information about mounted NTFS volume 2119 * @sb: super block of mounted volume 2120 * @sfs: statfs structure in which to return the information 2121 * 2122 * Return information about the mounted NTFS volume @sb in the statfs structure 2123 * pointed to by @sfs (this is initialized with zeros before ntfs_statfs is 2124 * called). We interpret the values to be correct of the moment in time at 2125 * which we are called. Most values are variable otherwise and this isn't just 2126 * the free values but the totals as well. For example we can increase the 2127 * total number of file nodes if we run out and we can keep doing this until 2128 * there is no more space on the volume left at all. 2129 * 2130 * Called from vfs_statfs which is used to handle the statfs, fstatfs, and 2131 * ustat system calls. 2132 * 2133 * Return 0 on success or -errno on error. 2134 */ 2135 static int ntfs_statfs(struct super_block *sb, struct kstatfs *sfs) 2136 { 2137 ntfs_volume *vol = NTFS_SB(sb); 2138 s64 size; 2139 2140 ntfs_debug("Entering."); 2141 /* Type of filesystem. */ 2142 sfs->f_type = NTFS_SB_MAGIC; 2143 /* Optimal transfer block size. */ 2144 sfs->f_bsize = PAGE_CACHE_SIZE; 2145 /* 2146 * Total data blocks in file system in units of f_bsize and since 2147 * inodes are also stored in data blocs ($MFT is a file) this is just 2148 * the total clusters. 2149 */ 2150 sfs->f_blocks = vol->nr_clusters << vol->cluster_size_bits >> 2151 PAGE_CACHE_SHIFT; 2152 /* Free data blocks in file system in units of f_bsize. */ 2153 size = get_nr_free_clusters(vol) << vol->cluster_size_bits >> 2154 PAGE_CACHE_SHIFT; 2155 if (size < 0LL) 2156 size = 0LL; 2157 /* Free blocks avail to non-superuser, same as above on NTFS. */ 2158 sfs->f_bavail = sfs->f_bfree = size; 2159 /* Serialize accesses to the inode bitmap. */ 2160 down_read(&vol->mftbmp_lock); 2161 /* Number of inodes in file system (at this point in time). */ 2162 sfs->f_files = vol->mft_ino->i_size >> vol->mft_record_size_bits; 2163 /* Free inodes in fs (based on current total count). */ 2164 sfs->f_ffree = __get_nr_free_mft_records(vol); 2165 up_read(&vol->mftbmp_lock); 2166 /* 2167 * File system id. This is extremely *nix flavour dependent and even 2168 * within Linux itself all fs do their own thing. I interpret this to 2169 * mean a unique id associated with the mounted fs and not the id 2170 * associated with the file system driver, the latter is already given 2171 * by the file system type in sfs->f_type. Thus we use the 64-bit 2172 * volume serial number splitting it into two 32-bit parts. We enter 2173 * the least significant 32-bits in f_fsid[0] and the most significant 2174 * 32-bits in f_fsid[1]. 2175 */ 2176 sfs->f_fsid.val[0] = vol->serial_no & 0xffffffff; 2177 sfs->f_fsid.val[1] = (vol->serial_no >> 32) & 0xffffffff; 2178 /* Maximum length of filenames. */ 2179 sfs->f_namelen = NTFS_MAX_NAME_LEN; 2180 return 0; 2181 } 2182 2183 /** 2184 * The complete super operations. 2185 */ 2186 static struct super_operations ntfs_sops = { 2187 .alloc_inode = ntfs_alloc_big_inode, /* VFS: Allocate new inode. */ 2188 .destroy_inode = ntfs_destroy_big_inode, /* VFS: Deallocate inode. */ 2189 .put_inode = ntfs_put_inode, /* VFS: Called just before 2190 the inode reference count 2191 is decreased. */ 2192 #ifdef NTFS_RW 2193 //.dirty_inode = NULL, /* VFS: Called from 2194 // __mark_inode_dirty(). */ 2195 .write_inode = ntfs_write_inode, /* VFS: Write dirty inode to 2196 disk. */ 2197 //.drop_inode = NULL, /* VFS: Called just after the 2198 // inode reference count has 2199 // been decreased to zero. 2200 // NOTE: The inode lock is 2201 // held. See fs/inode.c:: 2202 // generic_drop_inode(). */ 2203 //.delete_inode = NULL, /* VFS: Delete inode from disk. 2204 // Called when i_count becomes 2205 // 0 and i_nlink is also 0. */ 2206 //.write_super = NULL, /* Flush dirty super block to 2207 // disk. */ 2208 //.sync_fs = NULL, /* ? */ 2209 //.write_super_lockfs = NULL, /* ? */ 2210 //.unlockfs = NULL, /* ? */ 2211 #endif /* NTFS_RW */ 2212 .put_super = ntfs_put_super, /* Syscall: umount. */ 2213 .statfs = ntfs_statfs, /* Syscall: statfs */ 2214 .remount_fs = ntfs_remount, /* Syscall: mount -o remount. */ 2215 .clear_inode = ntfs_clear_big_inode, /* VFS: Called when an inode is 2216 removed from memory. */ 2217 //.umount_begin = NULL, /* Forced umount. */ 2218 .show_options = ntfs_show_options, /* Show mount options in 2219 proc. */ 2220 }; 2221 2222 2223 /** 2224 * Declarations for NTFS specific export operations (fs/ntfs/namei.c). 2225 */ 2226 extern struct dentry *ntfs_get_parent(struct dentry *child_dent); 2227 extern struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh); 2228 2229 /** 2230 * Export operations allowing NFS exporting of mounted NTFS partitions. 2231 * 2232 * We use the default ->decode_fh() and ->encode_fh() for now. Note that they 2233 * use 32 bits to store the inode number which is an unsigned long so on 64-bit 2234 * architectures is usually 64 bits so it would all fail horribly on huge 2235 * volumes. I guess we need to define our own encode and decode fh functions 2236 * that store 64-bit inode numbers at some point but for now we will ignore the 2237 * problem... 2238 * 2239 * We also use the default ->get_name() helper (used by ->decode_fh() via 2240 * fs/exportfs/expfs.c::find_exported_dentry()) as that is completely fs 2241 * independent. 2242 * 2243 * The default ->get_parent() just returns -EACCES so we have to provide our 2244 * own and the default ->get_dentry() is incompatible with NTFS due to not 2245 * allowing the inode number 0 which is used in NTFS for the system file $MFT 2246 * and due to using iget() whereas NTFS needs ntfs_iget(). 2247 */ 2248 static struct export_operations ntfs_export_ops = { 2249 .get_parent = ntfs_get_parent, /* Find the parent of a given 2250 directory. */ 2251 .get_dentry = ntfs_get_dentry, /* Find a dentry for the inode 2252 given a file handle 2253 sub-fragment. */ 2254 }; 2255 2256 /** 2257 * ntfs_fill_super - mount an ntfs files system 2258 * @sb: super block of ntfs file system to mount 2259 * @opt: string containing the mount options 2260 * @silent: silence error output 2261 * 2262 * ntfs_fill_super() is called by the VFS to mount the device described by @sb 2263 * with the mount otions in @data with the NTFS file system. 2264 * 2265 * If @silent is true, remain silent even if errors are detected. This is used 2266 * during bootup, when the kernel tries to mount the root file system with all 2267 * registered file systems one after the other until one succeeds. This implies 2268 * that all file systems except the correct one will quite correctly and 2269 * expectedly return an error, but nobody wants to see error messages when in 2270 * fact this is what is supposed to happen. 2271 * 2272 * NOTE: @sb->s_flags contains the mount options flags. 2273 */ 2274 static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent) 2275 { 2276 ntfs_volume *vol; 2277 struct buffer_head *bh; 2278 struct inode *tmp_ino; 2279 int result; 2280 2281 ntfs_debug("Entering."); 2282 #ifndef NTFS_RW 2283 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; 2284 #endif /* ! NTFS_RW */ 2285 /* Allocate a new ntfs_volume and place it in sb->s_fs_info. */ 2286 sb->s_fs_info = kmalloc(sizeof(ntfs_volume), GFP_NOFS); 2287 vol = NTFS_SB(sb); 2288 if (!vol) { 2289 if (!silent) 2290 ntfs_error(sb, "Allocation of NTFS volume structure " 2291 "failed. Aborting mount..."); 2292 return -ENOMEM; 2293 } 2294 /* Initialize ntfs_volume structure. */ 2295 memset(vol, 0, sizeof(ntfs_volume)); 2296 vol->sb = sb; 2297 vol->upcase = NULL; 2298 vol->attrdef = NULL; 2299 vol->mft_ino = NULL; 2300 vol->mftbmp_ino = NULL; 2301 init_rwsem(&vol->mftbmp_lock); 2302 #ifdef NTFS_RW 2303 vol->mftmirr_ino = NULL; 2304 vol->logfile_ino = NULL; 2305 #endif /* NTFS_RW */ 2306 vol->lcnbmp_ino = NULL; 2307 init_rwsem(&vol->lcnbmp_lock); 2308 vol->vol_ino = NULL; 2309 vol->root_ino = NULL; 2310 vol->secure_ino = NULL; 2311 vol->extend_ino = NULL; 2312 #ifdef NTFS_RW 2313 vol->quota_ino = NULL; 2314 vol->quota_q_ino = NULL; 2315 #endif /* NTFS_RW */ 2316 vol->nls_map = NULL; 2317 2318 /* 2319 * Default is group and other don't have any access to files or 2320 * directories while owner has full access. Further, files by default 2321 * are not executable but directories are of course browseable. 2322 */ 2323 vol->fmask = 0177; 2324 vol->dmask = 0077; 2325 2326 unlock_kernel(); 2327 2328 /* Important to get the mount options dealt with now. */ 2329 if (!parse_options(vol, (char*)opt)) 2330 goto err_out_now; 2331 2332 /* 2333 * TODO: Fail safety check. In the future we should really be able to 2334 * cope with this being the case, but for now just bail out. 2335 */ 2336 if (bdev_hardsect_size(sb->s_bdev) > NTFS_BLOCK_SIZE) { 2337 if (!silent) 2338 ntfs_error(sb, "Device has unsupported hardsect_size."); 2339 goto err_out_now; 2340 } 2341 2342 /* Setup the device access block size to NTFS_BLOCK_SIZE. */ 2343 if (sb_set_blocksize(sb, NTFS_BLOCK_SIZE) != NTFS_BLOCK_SIZE) { 2344 if (!silent) 2345 ntfs_error(sb, "Unable to set block size."); 2346 goto err_out_now; 2347 } 2348 2349 /* Get the size of the device in units of NTFS_BLOCK_SIZE bytes. */ 2350 vol->nr_blocks = sb->s_bdev->bd_inode->i_size >> NTFS_BLOCK_SIZE_BITS; 2351 2352 /* Read the boot sector and return unlocked buffer head to it. */ 2353 if (!(bh = read_ntfs_boot_sector(sb, silent))) { 2354 if (!silent) 2355 ntfs_error(sb, "Not an NTFS volume."); 2356 goto err_out_now; 2357 } 2358 2359 /* 2360 * Extract the data from the boot sector and setup the ntfs super block 2361 * using it. 2362 */ 2363 result = parse_ntfs_boot_sector(vol, (NTFS_BOOT_SECTOR*)bh->b_data); 2364 2365 /* Initialize the cluster and mft allocators. */ 2366 ntfs_setup_allocators(vol); 2367 2368 brelse(bh); 2369 2370 if (!result) { 2371 if (!silent) 2372 ntfs_error(sb, "Unsupported NTFS filesystem."); 2373 goto err_out_now; 2374 } 2375 2376 /* 2377 * TODO: When we start coping with sector sizes different from 2378 * NTFS_BLOCK_SIZE, we now probably need to set the blocksize of the 2379 * device (probably to NTFS_BLOCK_SIZE). 2380 */ 2381 2382 /* Setup remaining fields in the super block. */ 2383 sb->s_magic = NTFS_SB_MAGIC; 2384 2385 /* 2386 * Ntfs allows 63 bits for the file size, i.e. correct would be: 2387 * sb->s_maxbytes = ~0ULL >> 1; 2388 * But the kernel uses a long as the page cache page index which on 2389 * 32-bit architectures is only 32-bits. MAX_LFS_FILESIZE is kernel 2390 * defined to the maximum the page cache page index can cope with 2391 * without overflowing the index or to 2^63 - 1, whichever is smaller. 2392 */ 2393 sb->s_maxbytes = MAX_LFS_FILESIZE; 2394 2395 sb->s_time_gran = 100; 2396 2397 /* 2398 * Now load the metadata required for the page cache and our address 2399 * space operations to function. We do this by setting up a specialised 2400 * read_inode method and then just calling the normal iget() to obtain 2401 * the inode for $MFT which is sufficient to allow our normal inode 2402 * operations and associated address space operations to function. 2403 */ 2404 sb->s_op = &ntfs_sops; 2405 tmp_ino = new_inode(sb); 2406 if (!tmp_ino) { 2407 if (!silent) 2408 ntfs_error(sb, "Failed to load essential metadata."); 2409 goto err_out_now; 2410 } 2411 tmp_ino->i_ino = FILE_MFT; 2412 insert_inode_hash(tmp_ino); 2413 if (ntfs_read_inode_mount(tmp_ino) < 0) { 2414 if (!silent) 2415 ntfs_error(sb, "Failed to load essential metadata."); 2416 goto iput_tmp_ino_err_out_now; 2417 } 2418 down(&ntfs_lock); 2419 /* 2420 * The current mount is a compression user if the cluster size is 2421 * less than or equal 4kiB. 2422 */ 2423 if (vol->cluster_size <= 4096 && !ntfs_nr_compression_users++) { 2424 result = allocate_compression_buffers(); 2425 if (result) { 2426 ntfs_error(NULL, "Failed to allocate buffers " 2427 "for compression engine."); 2428 ntfs_nr_compression_users--; 2429 up(&ntfs_lock); 2430 goto iput_tmp_ino_err_out_now; 2431 } 2432 } 2433 /* 2434 * Generate the global default upcase table if necessary. Also 2435 * temporarily increment the number of upcase users to avoid race 2436 * conditions with concurrent (u)mounts. 2437 */ 2438 if (!default_upcase) 2439 default_upcase = generate_default_upcase(); 2440 ntfs_nr_upcase_users++; 2441 up(&ntfs_lock); 2442 /* 2443 * From now on, ignore @silent parameter. If we fail below this line, 2444 * it will be due to a corrupt fs or a system error, so we report it. 2445 */ 2446 /* 2447 * Open the system files with normal access functions and complete 2448 * setting up the ntfs super block. 2449 */ 2450 if (!load_system_files(vol)) { 2451 ntfs_error(sb, "Failed to load system files."); 2452 goto unl_upcase_iput_tmp_ino_err_out_now; 2453 } 2454 if ((sb->s_root = d_alloc_root(vol->root_ino))) { 2455 /* We increment i_count simulating an ntfs_iget(). */ 2456 atomic_inc(&vol->root_ino->i_count); 2457 ntfs_debug("Exiting, status successful."); 2458 /* Release the default upcase if it has no users. */ 2459 down(&ntfs_lock); 2460 if (!--ntfs_nr_upcase_users && default_upcase) { 2461 ntfs_free(default_upcase); 2462 default_upcase = NULL; 2463 } 2464 up(&ntfs_lock); 2465 sb->s_export_op = &ntfs_export_ops; 2466 lock_kernel(); 2467 return 0; 2468 } 2469 ntfs_error(sb, "Failed to allocate root directory."); 2470 /* Clean up after the successful load_system_files() call from above. */ 2471 // TODO: Use ntfs_put_super() instead of repeating all this code... 2472 // FIXME: Should mark the volume clean as the error is most likely 2473 // -ENOMEM. 2474 iput(vol->vol_ino); 2475 vol->vol_ino = NULL; 2476 /* NTFS 3.0+ specific clean up. */ 2477 if (vol->major_ver >= 3) { 2478 #ifdef NTFS_RW 2479 if (vol->quota_q_ino) { 2480 iput(vol->quota_q_ino); 2481 vol->quota_q_ino = NULL; 2482 } 2483 if (vol->quota_ino) { 2484 iput(vol->quota_ino); 2485 vol->quota_ino = NULL; 2486 } 2487 #endif /* NTFS_RW */ 2488 if (vol->extend_ino) { 2489 iput(vol->extend_ino); 2490 vol->extend_ino = NULL; 2491 } 2492 if (vol->secure_ino) { 2493 iput(vol->secure_ino); 2494 vol->secure_ino = NULL; 2495 } 2496 } 2497 iput(vol->root_ino); 2498 vol->root_ino = NULL; 2499 iput(vol->lcnbmp_ino); 2500 vol->lcnbmp_ino = NULL; 2501 iput(vol->mftbmp_ino); 2502 vol->mftbmp_ino = NULL; 2503 #ifdef NTFS_RW 2504 if (vol->logfile_ino) { 2505 iput(vol->logfile_ino); 2506 vol->logfile_ino = NULL; 2507 } 2508 if (vol->mftmirr_ino) { 2509 iput(vol->mftmirr_ino); 2510 vol->mftmirr_ino = NULL; 2511 } 2512 #endif /* NTFS_RW */ 2513 /* Throw away the table of attribute definitions. */ 2514 vol->attrdef_size = 0; 2515 if (vol->attrdef) { 2516 ntfs_free(vol->attrdef); 2517 vol->attrdef = NULL; 2518 } 2519 vol->upcase_len = 0; 2520 down(&ntfs_lock); 2521 if (vol->upcase == default_upcase) { 2522 ntfs_nr_upcase_users--; 2523 vol->upcase = NULL; 2524 } 2525 up(&ntfs_lock); 2526 if (vol->upcase) { 2527 ntfs_free(vol->upcase); 2528 vol->upcase = NULL; 2529 } 2530 if (vol->nls_map) { 2531 unload_nls(vol->nls_map); 2532 vol->nls_map = NULL; 2533 } 2534 /* Error exit code path. */ 2535 unl_upcase_iput_tmp_ino_err_out_now: 2536 /* 2537 * Decrease the number of upcase users and destroy the global default 2538 * upcase table if necessary. 2539 */ 2540 down(&ntfs_lock); 2541 if (!--ntfs_nr_upcase_users && default_upcase) { 2542 ntfs_free(default_upcase); 2543 default_upcase = NULL; 2544 } 2545 if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users) 2546 free_compression_buffers(); 2547 up(&ntfs_lock); 2548 iput_tmp_ino_err_out_now: 2549 iput(tmp_ino); 2550 if (vol->mft_ino && vol->mft_ino != tmp_ino) 2551 iput(vol->mft_ino); 2552 vol->mft_ino = NULL; 2553 /* 2554 * This is needed to get ntfs_clear_extent_inode() called for each 2555 * inode we have ever called ntfs_iget()/iput() on, otherwise we A) 2556 * leak resources and B) a subsequent mount fails automatically due to 2557 * ntfs_iget() never calling down into our ntfs_read_locked_inode() 2558 * method again... FIXME: Do we need to do this twice now because of 2559 * attribute inodes? I think not, so leave as is for now... (AIA) 2560 */ 2561 if (invalidate_inodes(sb)) { 2562 ntfs_error(sb, "Busy inodes left. This is most likely a NTFS " 2563 "driver bug."); 2564 /* Copied from fs/super.c. I just love this message. (-; */ 2565 printk("NTFS: Busy inodes after umount. Self-destruct in 5 " 2566 "seconds. Have a nice day...\n"); 2567 } 2568 /* Errors at this stage are irrelevant. */ 2569 err_out_now: 2570 lock_kernel(); 2571 sb->s_fs_info = NULL; 2572 kfree(vol); 2573 ntfs_debug("Failed, returning -EINVAL."); 2574 return -EINVAL; 2575 } 2576 2577 /* 2578 * This is a slab cache to optimize allocations and deallocations of Unicode 2579 * strings of the maximum length allowed by NTFS, which is NTFS_MAX_NAME_LEN 2580 * (255) Unicode characters + a terminating NULL Unicode character. 2581 */ 2582 kmem_cache_t *ntfs_name_cache; 2583 2584 /* Slab caches for efficient allocation/deallocation of of inodes. */ 2585 kmem_cache_t *ntfs_inode_cache; 2586 kmem_cache_t *ntfs_big_inode_cache; 2587 2588 /* Init once constructor for the inode slab cache. */ 2589 static void ntfs_big_inode_init_once(void *foo, kmem_cache_t *cachep, 2590 unsigned long flags) 2591 { 2592 ntfs_inode *ni = (ntfs_inode *)foo; 2593 2594 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 2595 SLAB_CTOR_CONSTRUCTOR) 2596 inode_init_once(VFS_I(ni)); 2597 } 2598 2599 /* 2600 * Slab caches to optimize allocations and deallocations of attribute search 2601 * contexts and index contexts, respectively. 2602 */ 2603 kmem_cache_t *ntfs_attr_ctx_cache; 2604 kmem_cache_t *ntfs_index_ctx_cache; 2605 2606 /* Driver wide semaphore. */ 2607 DECLARE_MUTEX(ntfs_lock); 2608 2609 static struct super_block *ntfs_get_sb(struct file_system_type *fs_type, 2610 int flags, const char *dev_name, void *data) 2611 { 2612 return get_sb_bdev(fs_type, flags, dev_name, data, ntfs_fill_super); 2613 } 2614 2615 static struct file_system_type ntfs_fs_type = { 2616 .owner = THIS_MODULE, 2617 .name = "ntfs", 2618 .get_sb = ntfs_get_sb, 2619 .kill_sb = kill_block_super, 2620 .fs_flags = FS_REQUIRES_DEV, 2621 }; 2622 2623 /* Stable names for the slab caches. */ 2624 static const char ntfs_index_ctx_cache_name[] = "ntfs_index_ctx_cache"; 2625 static const char ntfs_attr_ctx_cache_name[] = "ntfs_attr_ctx_cache"; 2626 static const char ntfs_name_cache_name[] = "ntfs_name_cache"; 2627 static const char ntfs_inode_cache_name[] = "ntfs_inode_cache"; 2628 static const char ntfs_big_inode_cache_name[] = "ntfs_big_inode_cache"; 2629 2630 static int __init init_ntfs_fs(void) 2631 { 2632 int err = 0; 2633 2634 /* This may be ugly but it results in pretty output so who cares. (-8 */ 2635 printk(KERN_INFO "NTFS driver " NTFS_VERSION " [Flags: R/" 2636 #ifdef NTFS_RW 2637 "W" 2638 #else 2639 "O" 2640 #endif 2641 #ifdef DEBUG 2642 " DEBUG" 2643 #endif 2644 #ifdef MODULE 2645 " MODULE" 2646 #endif 2647 "].\n"); 2648 2649 ntfs_debug("Debug messages are enabled."); 2650 2651 ntfs_index_ctx_cache = kmem_cache_create(ntfs_index_ctx_cache_name, 2652 sizeof(ntfs_index_context), 0 /* offset */, 2653 SLAB_HWCACHE_ALIGN, NULL /* ctor */, NULL /* dtor */); 2654 if (!ntfs_index_ctx_cache) { 2655 printk(KERN_CRIT "NTFS: Failed to create %s!\n", 2656 ntfs_index_ctx_cache_name); 2657 goto ictx_err_out; 2658 } 2659 ntfs_attr_ctx_cache = kmem_cache_create(ntfs_attr_ctx_cache_name, 2660 sizeof(ntfs_attr_search_ctx), 0 /* offset */, 2661 SLAB_HWCACHE_ALIGN, NULL /* ctor */, NULL /* dtor */); 2662 if (!ntfs_attr_ctx_cache) { 2663 printk(KERN_CRIT "NTFS: Failed to create %s!\n", 2664 ntfs_attr_ctx_cache_name); 2665 goto actx_err_out; 2666 } 2667 2668 ntfs_name_cache = kmem_cache_create(ntfs_name_cache_name, 2669 (NTFS_MAX_NAME_LEN+1) * sizeof(ntfschar), 0, 2670 SLAB_HWCACHE_ALIGN, NULL, NULL); 2671 if (!ntfs_name_cache) { 2672 printk(KERN_CRIT "NTFS: Failed to create %s!\n", 2673 ntfs_name_cache_name); 2674 goto name_err_out; 2675 } 2676 2677 ntfs_inode_cache = kmem_cache_create(ntfs_inode_cache_name, 2678 sizeof(ntfs_inode), 0, 2679 SLAB_RECLAIM_ACCOUNT, NULL, NULL); 2680 if (!ntfs_inode_cache) { 2681 printk(KERN_CRIT "NTFS: Failed to create %s!\n", 2682 ntfs_inode_cache_name); 2683 goto inode_err_out; 2684 } 2685 2686 ntfs_big_inode_cache = kmem_cache_create(ntfs_big_inode_cache_name, 2687 sizeof(big_ntfs_inode), 0, 2688 SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, 2689 ntfs_big_inode_init_once, NULL); 2690 if (!ntfs_big_inode_cache) { 2691 printk(KERN_CRIT "NTFS: Failed to create %s!\n", 2692 ntfs_big_inode_cache_name); 2693 goto big_inode_err_out; 2694 } 2695 2696 /* Register the ntfs sysctls. */ 2697 err = ntfs_sysctl(1); 2698 if (err) { 2699 printk(KERN_CRIT "NTFS: Failed to register NTFS sysctls!\n"); 2700 goto sysctl_err_out; 2701 } 2702 2703 err = register_filesystem(&ntfs_fs_type); 2704 if (!err) { 2705 ntfs_debug("NTFS driver registered successfully."); 2706 return 0; /* Success! */ 2707 } 2708 printk(KERN_CRIT "NTFS: Failed to register NTFS file system driver!\n"); 2709 2710 sysctl_err_out: 2711 kmem_cache_destroy(ntfs_big_inode_cache); 2712 big_inode_err_out: 2713 kmem_cache_destroy(ntfs_inode_cache); 2714 inode_err_out: 2715 kmem_cache_destroy(ntfs_name_cache); 2716 name_err_out: 2717 kmem_cache_destroy(ntfs_attr_ctx_cache); 2718 actx_err_out: 2719 kmem_cache_destroy(ntfs_index_ctx_cache); 2720 ictx_err_out: 2721 if (!err) { 2722 printk(KERN_CRIT "NTFS: Aborting NTFS file system driver " 2723 "registration...\n"); 2724 err = -ENOMEM; 2725 } 2726 return err; 2727 } 2728 2729 static void __exit exit_ntfs_fs(void) 2730 { 2731 int err = 0; 2732 2733 ntfs_debug("Unregistering NTFS driver."); 2734 2735 unregister_filesystem(&ntfs_fs_type); 2736 2737 if (kmem_cache_destroy(ntfs_big_inode_cache) && (err = 1)) 2738 printk(KERN_CRIT "NTFS: Failed to destory %s.\n", 2739 ntfs_big_inode_cache_name); 2740 if (kmem_cache_destroy(ntfs_inode_cache) && (err = 1)) 2741 printk(KERN_CRIT "NTFS: Failed to destory %s.\n", 2742 ntfs_inode_cache_name); 2743 if (kmem_cache_destroy(ntfs_name_cache) && (err = 1)) 2744 printk(KERN_CRIT "NTFS: Failed to destory %s.\n", 2745 ntfs_name_cache_name); 2746 if (kmem_cache_destroy(ntfs_attr_ctx_cache) && (err = 1)) 2747 printk(KERN_CRIT "NTFS: Failed to destory %s.\n", 2748 ntfs_attr_ctx_cache_name); 2749 if (kmem_cache_destroy(ntfs_index_ctx_cache) && (err = 1)) 2750 printk(KERN_CRIT "NTFS: Failed to destory %s.\n", 2751 ntfs_index_ctx_cache_name); 2752 if (err) 2753 printk(KERN_CRIT "NTFS: This causes memory to leak! There is " 2754 "probably a BUG in the driver! Please report " 2755 "you saw this message to " 2756 "linux-ntfs-dev@lists.sourceforge.net\n"); 2757 /* Unregister the ntfs sysctls. */ 2758 ntfs_sysctl(0); 2759 } 2760 2761 MODULE_AUTHOR("Anton Altaparmakov <aia21@cantab.net>"); 2762 MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2004 Anton Altaparmakov"); 2763 MODULE_VERSION(NTFS_VERSION); 2764 MODULE_LICENSE("GPL"); 2765 #ifdef DEBUG 2766 module_param(debug_msgs, bool, 0); 2767 MODULE_PARM_DESC(debug_msgs, "Enable debug messages."); 2768 #endif 2769 2770 module_init(init_ntfs_fs) 2771 module_exit(exit_ntfs_fs) 2772