1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 */ 7 8 #include <linux/blkdev.h> 9 #include <linux/buffer_head.h> 10 #include <linux/fs.h> 11 #include <linux/kernel.h> 12 13 #include "debug.h" 14 #include "ntfs.h" 15 #include "ntfs_fs.h" 16 17 // clang-format off 18 const struct cpu_str NAME_MFT = { 19 4, 0, { '$', 'M', 'F', 'T' }, 20 }; 21 const struct cpu_str NAME_MIRROR = { 22 8, 0, { '$', 'M', 'F', 'T', 'M', 'i', 'r', 'r' }, 23 }; 24 const struct cpu_str NAME_LOGFILE = { 25 8, 0, { '$', 'L', 'o', 'g', 'F', 'i', 'l', 'e' }, 26 }; 27 const struct cpu_str NAME_VOLUME = { 28 7, 0, { '$', 'V', 'o', 'l', 'u', 'm', 'e' }, 29 }; 30 const struct cpu_str NAME_ATTRDEF = { 31 8, 0, { '$', 'A', 't', 't', 'r', 'D', 'e', 'f' }, 32 }; 33 const struct cpu_str NAME_ROOT = { 34 1, 0, { '.' }, 35 }; 36 const struct cpu_str NAME_BITMAP = { 37 7, 0, { '$', 'B', 'i', 't', 'm', 'a', 'p' }, 38 }; 39 const struct cpu_str NAME_BOOT = { 40 5, 0, { '$', 'B', 'o', 'o', 't' }, 41 }; 42 const struct cpu_str NAME_BADCLUS = { 43 8, 0, { '$', 'B', 'a', 'd', 'C', 'l', 'u', 's' }, 44 }; 45 const struct cpu_str NAME_QUOTA = { 46 6, 0, { '$', 'Q', 'u', 'o', 't', 'a' }, 47 }; 48 const struct cpu_str NAME_SECURE = { 49 7, 0, { '$', 'S', 'e', 'c', 'u', 'r', 'e' }, 50 }; 51 const struct cpu_str NAME_UPCASE = { 52 7, 0, { '$', 'U', 'p', 'C', 'a', 's', 'e' }, 53 }; 54 const struct cpu_str NAME_EXTEND = { 55 7, 0, { '$', 'E', 'x', 't', 'e', 'n', 'd' }, 56 }; 57 const struct cpu_str NAME_OBJID = { 58 6, 0, { '$', 'O', 'b', 'j', 'I', 'd' }, 59 }; 60 const struct cpu_str NAME_REPARSE = { 61 8, 0, { '$', 'R', 'e', 'p', 'a', 'r', 's', 'e' }, 62 }; 63 const struct cpu_str NAME_USNJRNL = { 64 8, 0, { '$', 'U', 's', 'n', 'J', 'r', 'n', 'l' }, 65 }; 66 const __le16 BAD_NAME[4] = { 67 cpu_to_le16('$'), cpu_to_le16('B'), cpu_to_le16('a'), cpu_to_le16('d'), 68 }; 69 const __le16 I30_NAME[4] = { 70 cpu_to_le16('$'), cpu_to_le16('I'), cpu_to_le16('3'), cpu_to_le16('0'), 71 }; 72 const __le16 SII_NAME[4] = { 73 cpu_to_le16('$'), cpu_to_le16('S'), cpu_to_le16('I'), cpu_to_le16('I'), 74 }; 75 const __le16 SDH_NAME[4] = { 76 cpu_to_le16('$'), cpu_to_le16('S'), cpu_to_le16('D'), cpu_to_le16('H'), 77 }; 78 const __le16 SDS_NAME[4] = { 79 cpu_to_le16('$'), cpu_to_le16('S'), cpu_to_le16('D'), cpu_to_le16('S'), 80 }; 81 const __le16 SO_NAME[2] = { 82 cpu_to_le16('$'), cpu_to_le16('O'), 83 }; 84 const __le16 SQ_NAME[2] = { 85 cpu_to_le16('$'), cpu_to_le16('Q'), 86 }; 87 const __le16 SR_NAME[2] = { 88 cpu_to_le16('$'), cpu_to_le16('R'), 89 }; 90 91 #ifdef CONFIG_NTFS3_LZX_XPRESS 92 const __le16 WOF_NAME[17] = { 93 cpu_to_le16('W'), cpu_to_le16('o'), cpu_to_le16('f'), cpu_to_le16('C'), 94 cpu_to_le16('o'), cpu_to_le16('m'), cpu_to_le16('p'), cpu_to_le16('r'), 95 cpu_to_le16('e'), cpu_to_le16('s'), cpu_to_le16('s'), cpu_to_le16('e'), 96 cpu_to_le16('d'), cpu_to_le16('D'), cpu_to_le16('a'), cpu_to_le16('t'), 97 cpu_to_le16('a'), 98 }; 99 #endif 100 101 // clang-format on 102 103 /* 104 * ntfs_fix_pre_write - Insert fixups into @rhdr before writing to disk. 105 */ 106 bool ntfs_fix_pre_write(struct NTFS_RECORD_HEADER *rhdr, size_t bytes) 107 { 108 u16 *fixup, *ptr; 109 u16 sample; 110 u16 fo = le16_to_cpu(rhdr->fix_off); 111 u16 fn = le16_to_cpu(rhdr->fix_num); 112 113 if ((fo & 1) || fo + fn * sizeof(short) > SECTOR_SIZE || !fn-- || 114 fn * SECTOR_SIZE > bytes) { 115 return false; 116 } 117 118 /* Get fixup pointer. */ 119 fixup = Add2Ptr(rhdr, fo); 120 121 if (*fixup >= 0x7FFF) 122 *fixup = 1; 123 else 124 *fixup += 1; 125 126 sample = *fixup; 127 128 ptr = Add2Ptr(rhdr, SECTOR_SIZE - sizeof(short)); 129 130 while (fn--) { 131 *++fixup = *ptr; 132 *ptr = sample; 133 ptr += SECTOR_SIZE / sizeof(short); 134 } 135 return true; 136 } 137 138 /* 139 * ntfs_fix_post_read - Remove fixups after reading from disk. 140 * 141 * Return: < 0 if error, 0 if ok, 1 if need to update fixups. 142 */ 143 int ntfs_fix_post_read(struct NTFS_RECORD_HEADER *rhdr, size_t bytes, 144 bool simple) 145 { 146 int ret; 147 u16 *fixup, *ptr; 148 u16 sample, fo, fn; 149 150 fo = le16_to_cpu(rhdr->fix_off); 151 fn = simple ? ((bytes >> SECTOR_SHIFT) + 1) 152 : le16_to_cpu(rhdr->fix_num); 153 154 /* Check errors. */ 155 if ((fo & 1) || fo + fn * sizeof(short) > SECTOR_SIZE || !fn-- || 156 fn * SECTOR_SIZE > bytes) { 157 return -EINVAL; /* Native chkntfs returns ok! */ 158 } 159 160 /* Get fixup pointer. */ 161 fixup = Add2Ptr(rhdr, fo); 162 sample = *fixup; 163 ptr = Add2Ptr(rhdr, SECTOR_SIZE - sizeof(short)); 164 ret = 0; 165 166 while (fn--) { 167 /* Test current word. */ 168 if (*ptr != sample) { 169 /* Fixup does not match! Is it serious error? */ 170 ret = -E_NTFS_FIXUP; 171 } 172 173 /* Replace fixup. */ 174 *ptr = *++fixup; 175 ptr += SECTOR_SIZE / sizeof(short); 176 } 177 178 return ret; 179 } 180 181 /* 182 * ntfs_extend_init - Load $Extend file. 183 */ 184 int ntfs_extend_init(struct ntfs_sb_info *sbi) 185 { 186 int err; 187 struct super_block *sb = sbi->sb; 188 struct inode *inode, *inode2; 189 struct MFT_REF ref; 190 191 if (sbi->volume.major_ver < 3) { 192 ntfs_notice(sb, "Skip $Extend 'cause NTFS version"); 193 return 0; 194 } 195 196 ref.low = cpu_to_le32(MFT_REC_EXTEND); 197 ref.high = 0; 198 ref.seq = cpu_to_le16(MFT_REC_EXTEND); 199 inode = ntfs_iget5(sb, &ref, &NAME_EXTEND); 200 if (IS_ERR(inode)) { 201 err = PTR_ERR(inode); 202 ntfs_err(sb, "Failed to load $Extend."); 203 inode = NULL; 204 goto out; 205 } 206 207 /* If ntfs_iget5() reads from disk it never returns bad inode. */ 208 if (!S_ISDIR(inode->i_mode)) { 209 err = -EINVAL; 210 goto out; 211 } 212 213 /* Try to find $ObjId */ 214 inode2 = dir_search_u(inode, &NAME_OBJID, NULL); 215 if (inode2 && !IS_ERR(inode2)) { 216 if (is_bad_inode(inode2)) { 217 iput(inode2); 218 } else { 219 sbi->objid.ni = ntfs_i(inode2); 220 sbi->objid_no = inode2->i_ino; 221 } 222 } 223 224 /* Try to find $Quota */ 225 inode2 = dir_search_u(inode, &NAME_QUOTA, NULL); 226 if (inode2 && !IS_ERR(inode2)) { 227 sbi->quota_no = inode2->i_ino; 228 iput(inode2); 229 } 230 231 /* Try to find $Reparse */ 232 inode2 = dir_search_u(inode, &NAME_REPARSE, NULL); 233 if (inode2 && !IS_ERR(inode2)) { 234 sbi->reparse.ni = ntfs_i(inode2); 235 sbi->reparse_no = inode2->i_ino; 236 } 237 238 /* Try to find $UsnJrnl */ 239 inode2 = dir_search_u(inode, &NAME_USNJRNL, NULL); 240 if (inode2 && !IS_ERR(inode2)) { 241 sbi->usn_jrnl_no = inode2->i_ino; 242 iput(inode2); 243 } 244 245 err = 0; 246 out: 247 iput(inode); 248 return err; 249 } 250 251 int ntfs_loadlog_and_replay(struct ntfs_inode *ni, struct ntfs_sb_info *sbi) 252 { 253 int err = 0; 254 struct super_block *sb = sbi->sb; 255 bool initialized = false; 256 struct MFT_REF ref; 257 struct inode *inode; 258 259 /* Check for 4GB. */ 260 if (ni->vfs_inode.i_size >= 0x100000000ull) { 261 ntfs_err(sb, "\x24LogFile is too big"); 262 err = -EINVAL; 263 goto out; 264 } 265 266 sbi->flags |= NTFS_FLAGS_LOG_REPLAYING; 267 268 ref.low = cpu_to_le32(MFT_REC_MFT); 269 ref.high = 0; 270 ref.seq = cpu_to_le16(1); 271 272 inode = ntfs_iget5(sb, &ref, NULL); 273 274 if (IS_ERR(inode)) 275 inode = NULL; 276 277 if (!inode) { 278 /* Try to use MFT copy. */ 279 u64 t64 = sbi->mft.lbo; 280 281 sbi->mft.lbo = sbi->mft.lbo2; 282 inode = ntfs_iget5(sb, &ref, NULL); 283 sbi->mft.lbo = t64; 284 if (IS_ERR(inode)) 285 inode = NULL; 286 } 287 288 if (!inode) { 289 err = -EINVAL; 290 ntfs_err(sb, "Failed to load $MFT."); 291 goto out; 292 } 293 294 sbi->mft.ni = ntfs_i(inode); 295 296 /* LogFile should not contains attribute list. */ 297 err = ni_load_all_mi(sbi->mft.ni); 298 if (!err) 299 err = log_replay(ni, &initialized); 300 301 iput(inode); 302 sbi->mft.ni = NULL; 303 304 sync_blockdev(sb->s_bdev); 305 invalidate_bdev(sb->s_bdev); 306 307 if (sbi->flags & NTFS_FLAGS_NEED_REPLAY) { 308 err = 0; 309 goto out; 310 } 311 312 if (sb_rdonly(sb) || !initialized) 313 goto out; 314 315 /* Fill LogFile by '-1' if it is initialized. */ 316 err = ntfs_bio_fill_1(sbi, &ni->file.run); 317 318 out: 319 sbi->flags &= ~NTFS_FLAGS_LOG_REPLAYING; 320 321 return err; 322 } 323 324 /* 325 * ntfs_query_def 326 * 327 * Return: Current ATTR_DEF_ENTRY for given attribute type. 328 */ 329 const struct ATTR_DEF_ENTRY *ntfs_query_def(struct ntfs_sb_info *sbi, 330 enum ATTR_TYPE type) 331 { 332 int type_in = le32_to_cpu(type); 333 size_t min_idx = 0; 334 size_t max_idx = sbi->def_entries - 1; 335 336 while (min_idx <= max_idx) { 337 size_t i = min_idx + ((max_idx - min_idx) >> 1); 338 const struct ATTR_DEF_ENTRY *entry = sbi->def_table + i; 339 int diff = le32_to_cpu(entry->type) - type_in; 340 341 if (!diff) 342 return entry; 343 if (diff < 0) 344 min_idx = i + 1; 345 else if (i) 346 max_idx = i - 1; 347 else 348 return NULL; 349 } 350 return NULL; 351 } 352 353 /* 354 * ntfs_look_for_free_space - Look for a free space in bitmap. 355 */ 356 int ntfs_look_for_free_space(struct ntfs_sb_info *sbi, CLST lcn, CLST len, 357 CLST *new_lcn, CLST *new_len, 358 enum ALLOCATE_OPT opt) 359 { 360 int err; 361 CLST alen; 362 struct super_block *sb = sbi->sb; 363 size_t alcn, zlen, zeroes, zlcn, zlen2, ztrim, new_zlen; 364 struct wnd_bitmap *wnd = &sbi->used.bitmap; 365 366 down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_CLUSTERS); 367 if (opt & ALLOCATE_MFT) { 368 zlen = wnd_zone_len(wnd); 369 370 if (!zlen) { 371 err = ntfs_refresh_zone(sbi); 372 if (err) 373 goto up_write; 374 375 zlen = wnd_zone_len(wnd); 376 } 377 378 if (!zlen) { 379 ntfs_err(sbi->sb, "no free space to extend mft"); 380 err = -ENOSPC; 381 goto up_write; 382 } 383 384 lcn = wnd_zone_bit(wnd); 385 alen = min_t(CLST, len, zlen); 386 387 wnd_zone_set(wnd, lcn + alen, zlen - alen); 388 389 err = wnd_set_used(wnd, lcn, alen); 390 if (err) 391 goto up_write; 392 393 alcn = lcn; 394 goto space_found; 395 } 396 /* 397 * 'Cause cluster 0 is always used this value means that we should use 398 * cached value of 'next_free_lcn' to improve performance. 399 */ 400 if (!lcn) 401 lcn = sbi->used.next_free_lcn; 402 403 if (lcn >= wnd->nbits) 404 lcn = 0; 405 406 alen = wnd_find(wnd, len, lcn, BITMAP_FIND_MARK_AS_USED, &alcn); 407 if (alen) 408 goto space_found; 409 410 /* Try to use clusters from MftZone. */ 411 zlen = wnd_zone_len(wnd); 412 zeroes = wnd_zeroes(wnd); 413 414 /* Check too big request */ 415 if (len > zeroes + zlen || zlen <= NTFS_MIN_MFT_ZONE) { 416 err = -ENOSPC; 417 goto up_write; 418 } 419 420 /* How many clusters to cat from zone. */ 421 zlcn = wnd_zone_bit(wnd); 422 zlen2 = zlen >> 1; 423 ztrim = clamp_val(len, zlen2, zlen); 424 new_zlen = max_t(size_t, zlen - ztrim, NTFS_MIN_MFT_ZONE); 425 426 wnd_zone_set(wnd, zlcn, new_zlen); 427 428 /* Allocate continues clusters. */ 429 alen = wnd_find(wnd, len, 0, 430 BITMAP_FIND_MARK_AS_USED | BITMAP_FIND_FULL, &alcn); 431 if (!alen) { 432 err = -ENOSPC; 433 goto up_write; 434 } 435 436 space_found: 437 err = 0; 438 *new_len = alen; 439 *new_lcn = alcn; 440 441 ntfs_unmap_meta(sb, alcn, alen); 442 443 /* Set hint for next requests. */ 444 if (!(opt & ALLOCATE_MFT)) 445 sbi->used.next_free_lcn = alcn + alen; 446 up_write: 447 up_write(&wnd->rw_lock); 448 return err; 449 } 450 451 /* 452 * ntfs_extend_mft - Allocate additional MFT records. 453 * 454 * sbi->mft.bitmap is locked for write. 455 * 456 * NOTE: recursive: 457 * ntfs_look_free_mft -> 458 * ntfs_extend_mft -> 459 * attr_set_size -> 460 * ni_insert_nonresident -> 461 * ni_insert_attr -> 462 * ni_ins_attr_ext -> 463 * ntfs_look_free_mft -> 464 * ntfs_extend_mft 465 * 466 * To avoid recursive always allocate space for two new MFT records 467 * see attrib.c: "at least two MFT to avoid recursive loop". 468 */ 469 static int ntfs_extend_mft(struct ntfs_sb_info *sbi) 470 { 471 int err; 472 struct ntfs_inode *ni = sbi->mft.ni; 473 size_t new_mft_total; 474 u64 new_mft_bytes, new_bitmap_bytes; 475 struct ATTRIB *attr; 476 struct wnd_bitmap *wnd = &sbi->mft.bitmap; 477 478 new_mft_total = (wnd->nbits + MFT_INCREASE_CHUNK + 127) & (CLST)~127; 479 new_mft_bytes = (u64)new_mft_total << sbi->record_bits; 480 481 /* Step 1: Resize $MFT::DATA. */ 482 down_write(&ni->file.run_lock); 483 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, 484 new_mft_bytes, NULL, false, &attr); 485 486 if (err) { 487 up_write(&ni->file.run_lock); 488 goto out; 489 } 490 491 attr->nres.valid_size = attr->nres.data_size; 492 new_mft_total = le64_to_cpu(attr->nres.alloc_size) >> sbi->record_bits; 493 ni->mi.dirty = true; 494 495 /* Step 2: Resize $MFT::BITMAP. */ 496 new_bitmap_bytes = bitmap_size(new_mft_total); 497 498 err = attr_set_size(ni, ATTR_BITMAP, NULL, 0, &sbi->mft.bitmap.run, 499 new_bitmap_bytes, &new_bitmap_bytes, true, NULL); 500 501 /* Refresh MFT Zone if necessary. */ 502 down_write_nested(&sbi->used.bitmap.rw_lock, BITMAP_MUTEX_CLUSTERS); 503 504 ntfs_refresh_zone(sbi); 505 506 up_write(&sbi->used.bitmap.rw_lock); 507 up_write(&ni->file.run_lock); 508 509 if (err) 510 goto out; 511 512 err = wnd_extend(wnd, new_mft_total); 513 514 if (err) 515 goto out; 516 517 ntfs_clear_mft_tail(sbi, sbi->mft.used, new_mft_total); 518 519 err = _ni_write_inode(&ni->vfs_inode, 0); 520 out: 521 return err; 522 } 523 524 /* 525 * ntfs_look_free_mft - Look for a free MFT record. 526 */ 527 int ntfs_look_free_mft(struct ntfs_sb_info *sbi, CLST *rno, bool mft, 528 struct ntfs_inode *ni, struct mft_inode **mi) 529 { 530 int err = 0; 531 size_t zbit, zlen, from, to, fr; 532 size_t mft_total; 533 struct MFT_REF ref; 534 struct super_block *sb = sbi->sb; 535 struct wnd_bitmap *wnd = &sbi->mft.bitmap; 536 u32 ir; 537 538 static_assert(sizeof(sbi->mft.reserved_bitmap) * 8 >= 539 MFT_REC_FREE - MFT_REC_RESERVED); 540 541 if (!mft) 542 down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_MFT); 543 544 zlen = wnd_zone_len(wnd); 545 546 /* Always reserve space for MFT. */ 547 if (zlen) { 548 if (mft) { 549 zbit = wnd_zone_bit(wnd); 550 *rno = zbit; 551 wnd_zone_set(wnd, zbit + 1, zlen - 1); 552 } 553 goto found; 554 } 555 556 /* No MFT zone. Find the nearest to '0' free MFT. */ 557 if (!wnd_find(wnd, 1, MFT_REC_FREE, 0, &zbit)) { 558 /* Resize MFT */ 559 mft_total = wnd->nbits; 560 561 err = ntfs_extend_mft(sbi); 562 if (!err) { 563 zbit = mft_total; 564 goto reserve_mft; 565 } 566 567 if (!mft || MFT_REC_FREE == sbi->mft.next_reserved) 568 goto out; 569 570 err = 0; 571 572 /* 573 * Look for free record reserved area [11-16) == 574 * [MFT_REC_RESERVED, MFT_REC_FREE ) MFT bitmap always 575 * marks it as used. 576 */ 577 if (!sbi->mft.reserved_bitmap) { 578 /* Once per session create internal bitmap for 5 bits. */ 579 sbi->mft.reserved_bitmap = 0xFF; 580 581 ref.high = 0; 582 for (ir = MFT_REC_RESERVED; ir < MFT_REC_FREE; ir++) { 583 struct inode *i; 584 struct ntfs_inode *ni; 585 struct MFT_REC *mrec; 586 587 ref.low = cpu_to_le32(ir); 588 ref.seq = cpu_to_le16(ir); 589 590 i = ntfs_iget5(sb, &ref, NULL); 591 if (IS_ERR(i)) { 592 next: 593 ntfs_notice( 594 sb, 595 "Invalid reserved record %x", 596 ref.low); 597 continue; 598 } 599 if (is_bad_inode(i)) { 600 iput(i); 601 goto next; 602 } 603 604 ni = ntfs_i(i); 605 606 mrec = ni->mi.mrec; 607 608 if (!is_rec_base(mrec)) 609 goto next; 610 611 if (mrec->hard_links) 612 goto next; 613 614 if (!ni_std(ni)) 615 goto next; 616 617 if (ni_find_attr(ni, NULL, NULL, ATTR_NAME, 618 NULL, 0, NULL, NULL)) 619 goto next; 620 621 __clear_bit(ir - MFT_REC_RESERVED, 622 &sbi->mft.reserved_bitmap); 623 } 624 } 625 626 /* Scan 5 bits for zero. Bit 0 == MFT_REC_RESERVED */ 627 zbit = find_next_zero_bit(&sbi->mft.reserved_bitmap, 628 MFT_REC_FREE, MFT_REC_RESERVED); 629 if (zbit >= MFT_REC_FREE) { 630 sbi->mft.next_reserved = MFT_REC_FREE; 631 goto out; 632 } 633 634 zlen = 1; 635 sbi->mft.next_reserved = zbit; 636 } else { 637 reserve_mft: 638 zlen = zbit == MFT_REC_FREE ? (MFT_REC_USER - MFT_REC_FREE) : 4; 639 if (zbit + zlen > wnd->nbits) 640 zlen = wnd->nbits - zbit; 641 642 while (zlen > 1 && !wnd_is_free(wnd, zbit, zlen)) 643 zlen -= 1; 644 645 /* [zbit, zbit + zlen) will be used for MFT itself. */ 646 from = sbi->mft.used; 647 if (from < zbit) 648 from = zbit; 649 to = zbit + zlen; 650 if (from < to) { 651 ntfs_clear_mft_tail(sbi, from, to); 652 sbi->mft.used = to; 653 } 654 } 655 656 if (mft) { 657 *rno = zbit; 658 zbit += 1; 659 zlen -= 1; 660 } 661 662 wnd_zone_set(wnd, zbit, zlen); 663 664 found: 665 if (!mft) { 666 /* The request to get record for general purpose. */ 667 if (sbi->mft.next_free < MFT_REC_USER) 668 sbi->mft.next_free = MFT_REC_USER; 669 670 for (;;) { 671 if (sbi->mft.next_free >= sbi->mft.bitmap.nbits) { 672 } else if (!wnd_find(wnd, 1, MFT_REC_USER, 0, &fr)) { 673 sbi->mft.next_free = sbi->mft.bitmap.nbits; 674 } else { 675 *rno = fr; 676 sbi->mft.next_free = *rno + 1; 677 break; 678 } 679 680 err = ntfs_extend_mft(sbi); 681 if (err) 682 goto out; 683 } 684 } 685 686 if (ni && !ni_add_subrecord(ni, *rno, mi)) { 687 err = -ENOMEM; 688 goto out; 689 } 690 691 /* We have found a record that are not reserved for next MFT. */ 692 if (*rno >= MFT_REC_FREE) 693 wnd_set_used(wnd, *rno, 1); 694 else if (*rno >= MFT_REC_RESERVED && sbi->mft.reserved_bitmap_inited) 695 __set_bit(*rno - MFT_REC_RESERVED, &sbi->mft.reserved_bitmap); 696 697 out: 698 if (!mft) 699 up_write(&wnd->rw_lock); 700 701 return err; 702 } 703 704 /* 705 * ntfs_mark_rec_free - Mark record as free. 706 */ 707 void ntfs_mark_rec_free(struct ntfs_sb_info *sbi, CLST rno) 708 { 709 struct wnd_bitmap *wnd = &sbi->mft.bitmap; 710 711 down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_MFT); 712 if (rno >= wnd->nbits) 713 goto out; 714 715 if (rno >= MFT_REC_FREE) { 716 if (!wnd_is_used(wnd, rno, 1)) 717 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 718 else 719 wnd_set_free(wnd, rno, 1); 720 } else if (rno >= MFT_REC_RESERVED && sbi->mft.reserved_bitmap_inited) { 721 __clear_bit(rno - MFT_REC_RESERVED, &sbi->mft.reserved_bitmap); 722 } 723 724 if (rno < wnd_zone_bit(wnd)) 725 wnd_zone_set(wnd, rno, 1); 726 else if (rno < sbi->mft.next_free && rno >= MFT_REC_USER) 727 sbi->mft.next_free = rno; 728 729 out: 730 up_write(&wnd->rw_lock); 731 } 732 733 /* 734 * ntfs_clear_mft_tail - Format empty records [from, to). 735 * 736 * sbi->mft.bitmap is locked for write. 737 */ 738 int ntfs_clear_mft_tail(struct ntfs_sb_info *sbi, size_t from, size_t to) 739 { 740 int err; 741 u32 rs; 742 u64 vbo; 743 struct runs_tree *run; 744 struct ntfs_inode *ni; 745 746 if (from >= to) 747 return 0; 748 749 rs = sbi->record_size; 750 ni = sbi->mft.ni; 751 run = &ni->file.run; 752 753 down_read(&ni->file.run_lock); 754 vbo = (u64)from * rs; 755 for (; from < to; from++, vbo += rs) { 756 struct ntfs_buffers nb; 757 758 err = ntfs_get_bh(sbi, run, vbo, rs, &nb); 759 if (err) 760 goto out; 761 762 err = ntfs_write_bh(sbi, &sbi->new_rec->rhdr, &nb, 0); 763 nb_put(&nb); 764 if (err) 765 goto out; 766 } 767 768 out: 769 sbi->mft.used = from; 770 up_read(&ni->file.run_lock); 771 return err; 772 } 773 774 /* 775 * ntfs_refresh_zone - Refresh MFT zone. 776 * 777 * sbi->used.bitmap is locked for rw. 778 * sbi->mft.bitmap is locked for write. 779 * sbi->mft.ni->file.run_lock for write. 780 */ 781 int ntfs_refresh_zone(struct ntfs_sb_info *sbi) 782 { 783 CLST zone_limit, zone_max, lcn, vcn, len; 784 size_t lcn_s, zlen; 785 struct wnd_bitmap *wnd = &sbi->used.bitmap; 786 struct ntfs_inode *ni = sbi->mft.ni; 787 788 /* Do not change anything unless we have non empty MFT zone. */ 789 if (wnd_zone_len(wnd)) 790 return 0; 791 792 /* 793 * Compute the MFT zone at two steps. 794 * It would be nice if we are able to allocate 1/8 of 795 * total clusters for MFT but not more then 512 MB. 796 */ 797 zone_limit = (512 * 1024 * 1024) >> sbi->cluster_bits; 798 zone_max = wnd->nbits >> 3; 799 if (zone_max > zone_limit) 800 zone_max = zone_limit; 801 802 vcn = bytes_to_cluster(sbi, 803 (u64)sbi->mft.bitmap.nbits << sbi->record_bits); 804 805 if (!run_lookup_entry(&ni->file.run, vcn - 1, &lcn, &len, NULL)) 806 lcn = SPARSE_LCN; 807 808 /* We should always find Last Lcn for MFT. */ 809 if (lcn == SPARSE_LCN) 810 return -EINVAL; 811 812 lcn_s = lcn + 1; 813 814 /* Try to allocate clusters after last MFT run. */ 815 zlen = wnd_find(wnd, zone_max, lcn_s, 0, &lcn_s); 816 if (!zlen) { 817 ntfs_notice(sbi->sb, "MftZone: unavailable"); 818 return 0; 819 } 820 821 /* Truncate too large zone. */ 822 wnd_zone_set(wnd, lcn_s, zlen); 823 824 return 0; 825 } 826 827 /* 828 * ntfs_update_mftmirr - Update $MFTMirr data. 829 */ 830 int ntfs_update_mftmirr(struct ntfs_sb_info *sbi, int wait) 831 { 832 int err; 833 struct super_block *sb = sbi->sb; 834 u32 blocksize = sb->s_blocksize; 835 sector_t block1, block2; 836 u32 bytes; 837 838 if (!(sbi->flags & NTFS_FLAGS_MFTMIRR)) 839 return 0; 840 841 err = 0; 842 bytes = sbi->mft.recs_mirr << sbi->record_bits; 843 block1 = sbi->mft.lbo >> sb->s_blocksize_bits; 844 block2 = sbi->mft.lbo2 >> sb->s_blocksize_bits; 845 846 for (; bytes >= blocksize; bytes -= blocksize) { 847 struct buffer_head *bh1, *bh2; 848 849 bh1 = sb_bread(sb, block1++); 850 if (!bh1) { 851 err = -EIO; 852 goto out; 853 } 854 855 bh2 = sb_getblk(sb, block2++); 856 if (!bh2) { 857 put_bh(bh1); 858 err = -EIO; 859 goto out; 860 } 861 862 if (buffer_locked(bh2)) 863 __wait_on_buffer(bh2); 864 865 lock_buffer(bh2); 866 memcpy(bh2->b_data, bh1->b_data, blocksize); 867 set_buffer_uptodate(bh2); 868 mark_buffer_dirty(bh2); 869 unlock_buffer(bh2); 870 871 put_bh(bh1); 872 bh1 = NULL; 873 874 if (wait) 875 err = sync_dirty_buffer(bh2); 876 877 put_bh(bh2); 878 if (err) 879 goto out; 880 } 881 882 sbi->flags &= ~NTFS_FLAGS_MFTMIRR; 883 884 out: 885 return err; 886 } 887 888 /* 889 * ntfs_set_state 890 * 891 * Mount: ntfs_set_state(NTFS_DIRTY_DIRTY) 892 * Umount: ntfs_set_state(NTFS_DIRTY_CLEAR) 893 * NTFS error: ntfs_set_state(NTFS_DIRTY_ERROR) 894 */ 895 int ntfs_set_state(struct ntfs_sb_info *sbi, enum NTFS_DIRTY_FLAGS dirty) 896 { 897 int err; 898 struct ATTRIB *attr; 899 struct VOLUME_INFO *info; 900 struct mft_inode *mi; 901 struct ntfs_inode *ni; 902 903 /* 904 * Do not change state if fs was real_dirty. 905 * Do not change state if fs already dirty(clear). 906 * Do not change any thing if mounted read only. 907 */ 908 if (sbi->volume.real_dirty || sb_rdonly(sbi->sb)) 909 return 0; 910 911 /* Check cached value. */ 912 if ((dirty == NTFS_DIRTY_CLEAR ? 0 : VOLUME_FLAG_DIRTY) == 913 (sbi->volume.flags & VOLUME_FLAG_DIRTY)) 914 return 0; 915 916 ni = sbi->volume.ni; 917 if (!ni) 918 return -EINVAL; 919 920 mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_DIRTY); 921 922 attr = ni_find_attr(ni, NULL, NULL, ATTR_VOL_INFO, NULL, 0, NULL, &mi); 923 if (!attr) { 924 err = -EINVAL; 925 goto out; 926 } 927 928 info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO); 929 if (!info) { 930 err = -EINVAL; 931 goto out; 932 } 933 934 switch (dirty) { 935 case NTFS_DIRTY_ERROR: 936 ntfs_notice(sbi->sb, "Mark volume as dirty due to NTFS errors"); 937 sbi->volume.real_dirty = true; 938 fallthrough; 939 case NTFS_DIRTY_DIRTY: 940 info->flags |= VOLUME_FLAG_DIRTY; 941 break; 942 case NTFS_DIRTY_CLEAR: 943 info->flags &= ~VOLUME_FLAG_DIRTY; 944 break; 945 } 946 /* Cache current volume flags. */ 947 sbi->volume.flags = info->flags; 948 mi->dirty = true; 949 err = 0; 950 951 out: 952 ni_unlock(ni); 953 if (err) 954 return err; 955 956 mark_inode_dirty(&ni->vfs_inode); 957 /* verify(!ntfs_update_mftmirr()); */ 958 959 /* 960 * If we used wait=1, sync_inode_metadata waits for the io for the 961 * inode to finish. It hangs when media is removed. 962 * So wait=0 is sent down to sync_inode_metadata 963 * and filemap_fdatawrite is used for the data blocks. 964 */ 965 err = sync_inode_metadata(&ni->vfs_inode, 0); 966 if (!err) 967 err = filemap_fdatawrite(ni->vfs_inode.i_mapping); 968 969 return err; 970 } 971 972 /* 973 * security_hash - Calculates a hash of security descriptor. 974 */ 975 static inline __le32 security_hash(const void *sd, size_t bytes) 976 { 977 u32 hash = 0; 978 const __le32 *ptr = sd; 979 980 bytes >>= 2; 981 while (bytes--) 982 hash = ((hash >> 0x1D) | (hash << 3)) + le32_to_cpu(*ptr++); 983 return cpu_to_le32(hash); 984 } 985 986 int ntfs_sb_read(struct super_block *sb, u64 lbo, size_t bytes, void *buffer) 987 { 988 struct block_device *bdev = sb->s_bdev; 989 u32 blocksize = sb->s_blocksize; 990 u64 block = lbo >> sb->s_blocksize_bits; 991 u32 off = lbo & (blocksize - 1); 992 u32 op = blocksize - off; 993 994 for (; bytes; block += 1, off = 0, op = blocksize) { 995 struct buffer_head *bh = __bread(bdev, block, blocksize); 996 997 if (!bh) 998 return -EIO; 999 1000 if (op > bytes) 1001 op = bytes; 1002 1003 memcpy(buffer, bh->b_data + off, op); 1004 1005 put_bh(bh); 1006 1007 bytes -= op; 1008 buffer = Add2Ptr(buffer, op); 1009 } 1010 1011 return 0; 1012 } 1013 1014 int ntfs_sb_write(struct super_block *sb, u64 lbo, size_t bytes, 1015 const void *buf, int wait) 1016 { 1017 u32 blocksize = sb->s_blocksize; 1018 struct block_device *bdev = sb->s_bdev; 1019 sector_t block = lbo >> sb->s_blocksize_bits; 1020 u32 off = lbo & (blocksize - 1); 1021 u32 op = blocksize - off; 1022 struct buffer_head *bh; 1023 1024 if (!wait && (sb->s_flags & SB_SYNCHRONOUS)) 1025 wait = 1; 1026 1027 for (; bytes; block += 1, off = 0, op = blocksize) { 1028 if (op > bytes) 1029 op = bytes; 1030 1031 if (op < blocksize) { 1032 bh = __bread(bdev, block, blocksize); 1033 if (!bh) { 1034 ntfs_err(sb, "failed to read block %llx", 1035 (u64)block); 1036 return -EIO; 1037 } 1038 } else { 1039 bh = __getblk(bdev, block, blocksize); 1040 if (!bh) 1041 return -ENOMEM; 1042 } 1043 1044 if (buffer_locked(bh)) 1045 __wait_on_buffer(bh); 1046 1047 lock_buffer(bh); 1048 if (buf) { 1049 memcpy(bh->b_data + off, buf, op); 1050 buf = Add2Ptr(buf, op); 1051 } else { 1052 memset(bh->b_data + off, -1, op); 1053 } 1054 1055 set_buffer_uptodate(bh); 1056 mark_buffer_dirty(bh); 1057 unlock_buffer(bh); 1058 1059 if (wait) { 1060 int err = sync_dirty_buffer(bh); 1061 1062 if (err) { 1063 ntfs_err( 1064 sb, 1065 "failed to sync buffer at block %llx, error %d", 1066 (u64)block, err); 1067 put_bh(bh); 1068 return err; 1069 } 1070 } 1071 1072 put_bh(bh); 1073 1074 bytes -= op; 1075 } 1076 return 0; 1077 } 1078 1079 int ntfs_sb_write_run(struct ntfs_sb_info *sbi, const struct runs_tree *run, 1080 u64 vbo, const void *buf, size_t bytes, int sync) 1081 { 1082 struct super_block *sb = sbi->sb; 1083 u8 cluster_bits = sbi->cluster_bits; 1084 u32 off = vbo & sbi->cluster_mask; 1085 CLST lcn, clen, vcn = vbo >> cluster_bits, vcn_next; 1086 u64 lbo, len; 1087 size_t idx; 1088 1089 if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) 1090 return -ENOENT; 1091 1092 if (lcn == SPARSE_LCN) 1093 return -EINVAL; 1094 1095 lbo = ((u64)lcn << cluster_bits) + off; 1096 len = ((u64)clen << cluster_bits) - off; 1097 1098 for (;;) { 1099 u32 op = min_t(u64, len, bytes); 1100 int err = ntfs_sb_write(sb, lbo, op, buf, sync); 1101 1102 if (err) 1103 return err; 1104 1105 bytes -= op; 1106 if (!bytes) 1107 break; 1108 1109 vcn_next = vcn + clen; 1110 if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) || 1111 vcn != vcn_next) 1112 return -ENOENT; 1113 1114 if (lcn == SPARSE_LCN) 1115 return -EINVAL; 1116 1117 if (buf) 1118 buf = Add2Ptr(buf, op); 1119 1120 lbo = ((u64)lcn << cluster_bits); 1121 len = ((u64)clen << cluster_bits); 1122 } 1123 1124 return 0; 1125 } 1126 1127 struct buffer_head *ntfs_bread_run(struct ntfs_sb_info *sbi, 1128 const struct runs_tree *run, u64 vbo) 1129 { 1130 struct super_block *sb = sbi->sb; 1131 u8 cluster_bits = sbi->cluster_bits; 1132 CLST lcn; 1133 u64 lbo; 1134 1135 if (!run_lookup_entry(run, vbo >> cluster_bits, &lcn, NULL, NULL)) 1136 return ERR_PTR(-ENOENT); 1137 1138 lbo = ((u64)lcn << cluster_bits) + (vbo & sbi->cluster_mask); 1139 1140 return ntfs_bread(sb, lbo >> sb->s_blocksize_bits); 1141 } 1142 1143 int ntfs_read_run_nb(struct ntfs_sb_info *sbi, const struct runs_tree *run, 1144 u64 vbo, void *buf, u32 bytes, struct ntfs_buffers *nb) 1145 { 1146 int err; 1147 struct super_block *sb = sbi->sb; 1148 u32 blocksize = sb->s_blocksize; 1149 u8 cluster_bits = sbi->cluster_bits; 1150 u32 off = vbo & sbi->cluster_mask; 1151 u32 nbh = 0; 1152 CLST vcn_next, vcn = vbo >> cluster_bits; 1153 CLST lcn, clen; 1154 u64 lbo, len; 1155 size_t idx; 1156 struct buffer_head *bh; 1157 1158 if (!run) { 1159 /* First reading of $Volume + $MFTMirr + $LogFile goes here. */ 1160 if (vbo > MFT_REC_VOL * sbi->record_size) { 1161 err = -ENOENT; 1162 goto out; 1163 } 1164 1165 /* Use absolute boot's 'MFTCluster' to read record. */ 1166 lbo = vbo + sbi->mft.lbo; 1167 len = sbi->record_size; 1168 } else if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) { 1169 err = -ENOENT; 1170 goto out; 1171 } else { 1172 if (lcn == SPARSE_LCN) { 1173 err = -EINVAL; 1174 goto out; 1175 } 1176 1177 lbo = ((u64)lcn << cluster_bits) + off; 1178 len = ((u64)clen << cluster_bits) - off; 1179 } 1180 1181 off = lbo & (blocksize - 1); 1182 if (nb) { 1183 nb->off = off; 1184 nb->bytes = bytes; 1185 } 1186 1187 for (;;) { 1188 u32 len32 = len >= bytes ? bytes : len; 1189 sector_t block = lbo >> sb->s_blocksize_bits; 1190 1191 do { 1192 u32 op = blocksize - off; 1193 1194 if (op > len32) 1195 op = len32; 1196 1197 bh = ntfs_bread(sb, block); 1198 if (!bh) { 1199 err = -EIO; 1200 goto out; 1201 } 1202 1203 if (buf) { 1204 memcpy(buf, bh->b_data + off, op); 1205 buf = Add2Ptr(buf, op); 1206 } 1207 1208 if (!nb) { 1209 put_bh(bh); 1210 } else if (nbh >= ARRAY_SIZE(nb->bh)) { 1211 err = -EINVAL; 1212 goto out; 1213 } else { 1214 nb->bh[nbh++] = bh; 1215 nb->nbufs = nbh; 1216 } 1217 1218 bytes -= op; 1219 if (!bytes) 1220 return 0; 1221 len32 -= op; 1222 block += 1; 1223 off = 0; 1224 1225 } while (len32); 1226 1227 vcn_next = vcn + clen; 1228 if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) || 1229 vcn != vcn_next) { 1230 err = -ENOENT; 1231 goto out; 1232 } 1233 1234 if (lcn == SPARSE_LCN) { 1235 err = -EINVAL; 1236 goto out; 1237 } 1238 1239 lbo = ((u64)lcn << cluster_bits); 1240 len = ((u64)clen << cluster_bits); 1241 } 1242 1243 out: 1244 if (!nbh) 1245 return err; 1246 1247 while (nbh) { 1248 put_bh(nb->bh[--nbh]); 1249 nb->bh[nbh] = NULL; 1250 } 1251 1252 nb->nbufs = 0; 1253 return err; 1254 } 1255 1256 /* 1257 * ntfs_read_bh 1258 * 1259 * Return: < 0 if error, 0 if ok, -E_NTFS_FIXUP if need to update fixups. 1260 */ 1261 int ntfs_read_bh(struct ntfs_sb_info *sbi, const struct runs_tree *run, u64 vbo, 1262 struct NTFS_RECORD_HEADER *rhdr, u32 bytes, 1263 struct ntfs_buffers *nb) 1264 { 1265 int err = ntfs_read_run_nb(sbi, run, vbo, rhdr, bytes, nb); 1266 1267 if (err) 1268 return err; 1269 return ntfs_fix_post_read(rhdr, nb->bytes, true); 1270 } 1271 1272 int ntfs_get_bh(struct ntfs_sb_info *sbi, const struct runs_tree *run, u64 vbo, 1273 u32 bytes, struct ntfs_buffers *nb) 1274 { 1275 int err = 0; 1276 struct super_block *sb = sbi->sb; 1277 u32 blocksize = sb->s_blocksize; 1278 u8 cluster_bits = sbi->cluster_bits; 1279 CLST vcn_next, vcn = vbo >> cluster_bits; 1280 u32 off; 1281 u32 nbh = 0; 1282 CLST lcn, clen; 1283 u64 lbo, len; 1284 size_t idx; 1285 1286 nb->bytes = bytes; 1287 1288 if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) { 1289 err = -ENOENT; 1290 goto out; 1291 } 1292 1293 off = vbo & sbi->cluster_mask; 1294 lbo = ((u64)lcn << cluster_bits) + off; 1295 len = ((u64)clen << cluster_bits) - off; 1296 1297 nb->off = off = lbo & (blocksize - 1); 1298 1299 for (;;) { 1300 u32 len32 = min_t(u64, len, bytes); 1301 sector_t block = lbo >> sb->s_blocksize_bits; 1302 1303 do { 1304 u32 op; 1305 struct buffer_head *bh; 1306 1307 if (nbh >= ARRAY_SIZE(nb->bh)) { 1308 err = -EINVAL; 1309 goto out; 1310 } 1311 1312 op = blocksize - off; 1313 if (op > len32) 1314 op = len32; 1315 1316 if (op == blocksize) { 1317 bh = sb_getblk(sb, block); 1318 if (!bh) { 1319 err = -ENOMEM; 1320 goto out; 1321 } 1322 if (buffer_locked(bh)) 1323 __wait_on_buffer(bh); 1324 set_buffer_uptodate(bh); 1325 } else { 1326 bh = ntfs_bread(sb, block); 1327 if (!bh) { 1328 err = -EIO; 1329 goto out; 1330 } 1331 } 1332 1333 nb->bh[nbh++] = bh; 1334 bytes -= op; 1335 if (!bytes) { 1336 nb->nbufs = nbh; 1337 return 0; 1338 } 1339 1340 block += 1; 1341 len32 -= op; 1342 off = 0; 1343 } while (len32); 1344 1345 vcn_next = vcn + clen; 1346 if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) || 1347 vcn != vcn_next) { 1348 err = -ENOENT; 1349 goto out; 1350 } 1351 1352 lbo = ((u64)lcn << cluster_bits); 1353 len = ((u64)clen << cluster_bits); 1354 } 1355 1356 out: 1357 while (nbh) { 1358 put_bh(nb->bh[--nbh]); 1359 nb->bh[nbh] = NULL; 1360 } 1361 1362 nb->nbufs = 0; 1363 1364 return err; 1365 } 1366 1367 int ntfs_write_bh(struct ntfs_sb_info *sbi, struct NTFS_RECORD_HEADER *rhdr, 1368 struct ntfs_buffers *nb, int sync) 1369 { 1370 int err = 0; 1371 struct super_block *sb = sbi->sb; 1372 u32 block_size = sb->s_blocksize; 1373 u32 bytes = nb->bytes; 1374 u32 off = nb->off; 1375 u16 fo = le16_to_cpu(rhdr->fix_off); 1376 u16 fn = le16_to_cpu(rhdr->fix_num); 1377 u32 idx; 1378 __le16 *fixup; 1379 __le16 sample; 1380 1381 if ((fo & 1) || fo + fn * sizeof(short) > SECTOR_SIZE || !fn-- || 1382 fn * SECTOR_SIZE > bytes) { 1383 return -EINVAL; 1384 } 1385 1386 for (idx = 0; bytes && idx < nb->nbufs; idx += 1, off = 0) { 1387 u32 op = block_size - off; 1388 char *bh_data; 1389 struct buffer_head *bh = nb->bh[idx]; 1390 __le16 *ptr, *end_data; 1391 1392 if (op > bytes) 1393 op = bytes; 1394 1395 if (buffer_locked(bh)) 1396 __wait_on_buffer(bh); 1397 1398 lock_buffer(nb->bh[idx]); 1399 1400 bh_data = bh->b_data + off; 1401 end_data = Add2Ptr(bh_data, op); 1402 memcpy(bh_data, rhdr, op); 1403 1404 if (!idx) { 1405 u16 t16; 1406 1407 fixup = Add2Ptr(bh_data, fo); 1408 sample = *fixup; 1409 t16 = le16_to_cpu(sample); 1410 if (t16 >= 0x7FFF) { 1411 sample = *fixup = cpu_to_le16(1); 1412 } else { 1413 sample = cpu_to_le16(t16 + 1); 1414 *fixup = sample; 1415 } 1416 1417 *(__le16 *)Add2Ptr(rhdr, fo) = sample; 1418 } 1419 1420 ptr = Add2Ptr(bh_data, SECTOR_SIZE - sizeof(short)); 1421 1422 do { 1423 *++fixup = *ptr; 1424 *ptr = sample; 1425 ptr += SECTOR_SIZE / sizeof(short); 1426 } while (ptr < end_data); 1427 1428 set_buffer_uptodate(bh); 1429 mark_buffer_dirty(bh); 1430 unlock_buffer(bh); 1431 1432 if (sync) { 1433 int err2 = sync_dirty_buffer(bh); 1434 1435 if (!err && err2) 1436 err = err2; 1437 } 1438 1439 bytes -= op; 1440 rhdr = Add2Ptr(rhdr, op); 1441 } 1442 1443 return err; 1444 } 1445 1446 /* 1447 * ntfs_bio_pages - Read/write pages from/to disk. 1448 */ 1449 int ntfs_bio_pages(struct ntfs_sb_info *sbi, const struct runs_tree *run, 1450 struct page **pages, u32 nr_pages, u64 vbo, u32 bytes, 1451 u32 op) 1452 { 1453 int err = 0; 1454 struct bio *new, *bio = NULL; 1455 struct super_block *sb = sbi->sb; 1456 struct block_device *bdev = sb->s_bdev; 1457 struct page *page; 1458 u8 cluster_bits = sbi->cluster_bits; 1459 CLST lcn, clen, vcn, vcn_next; 1460 u32 add, off, page_idx; 1461 u64 lbo, len; 1462 size_t run_idx; 1463 struct blk_plug plug; 1464 1465 if (!bytes) 1466 return 0; 1467 1468 blk_start_plug(&plug); 1469 1470 /* Align vbo and bytes to be 512 bytes aligned. */ 1471 lbo = (vbo + bytes + 511) & ~511ull; 1472 vbo = vbo & ~511ull; 1473 bytes = lbo - vbo; 1474 1475 vcn = vbo >> cluster_bits; 1476 if (!run_lookup_entry(run, vcn, &lcn, &clen, &run_idx)) { 1477 err = -ENOENT; 1478 goto out; 1479 } 1480 off = vbo & sbi->cluster_mask; 1481 page_idx = 0; 1482 page = pages[0]; 1483 1484 for (;;) { 1485 lbo = ((u64)lcn << cluster_bits) + off; 1486 len = ((u64)clen << cluster_bits) - off; 1487 new_bio: 1488 new = bio_alloc(bdev, nr_pages - page_idx, op, GFP_NOFS); 1489 if (bio) { 1490 bio_chain(bio, new); 1491 submit_bio(bio); 1492 } 1493 bio = new; 1494 bio->bi_iter.bi_sector = lbo >> 9; 1495 1496 while (len) { 1497 off = vbo & (PAGE_SIZE - 1); 1498 add = off + len > PAGE_SIZE ? (PAGE_SIZE - off) : len; 1499 1500 if (bio_add_page(bio, page, add, off) < add) 1501 goto new_bio; 1502 1503 if (bytes <= add) 1504 goto out; 1505 bytes -= add; 1506 vbo += add; 1507 1508 if (add + off == PAGE_SIZE) { 1509 page_idx += 1; 1510 if (WARN_ON(page_idx >= nr_pages)) { 1511 err = -EINVAL; 1512 goto out; 1513 } 1514 page = pages[page_idx]; 1515 } 1516 1517 if (len <= add) 1518 break; 1519 len -= add; 1520 lbo += add; 1521 } 1522 1523 vcn_next = vcn + clen; 1524 if (!run_get_entry(run, ++run_idx, &vcn, &lcn, &clen) || 1525 vcn != vcn_next) { 1526 err = -ENOENT; 1527 goto out; 1528 } 1529 off = 0; 1530 } 1531 out: 1532 if (bio) { 1533 if (!err) 1534 err = submit_bio_wait(bio); 1535 bio_put(bio); 1536 } 1537 blk_finish_plug(&plug); 1538 1539 return err; 1540 } 1541 1542 /* 1543 * ntfs_bio_fill_1 - Helper for ntfs_loadlog_and_replay(). 1544 * 1545 * Fill on-disk logfile range by (-1) 1546 * this means empty logfile. 1547 */ 1548 int ntfs_bio_fill_1(struct ntfs_sb_info *sbi, const struct runs_tree *run) 1549 { 1550 int err = 0; 1551 struct super_block *sb = sbi->sb; 1552 struct block_device *bdev = sb->s_bdev; 1553 u8 cluster_bits = sbi->cluster_bits; 1554 struct bio *new, *bio = NULL; 1555 CLST lcn, clen; 1556 u64 lbo, len; 1557 size_t run_idx; 1558 struct page *fill; 1559 void *kaddr; 1560 struct blk_plug plug; 1561 1562 fill = alloc_page(GFP_KERNEL); 1563 if (!fill) 1564 return -ENOMEM; 1565 1566 kaddr = kmap_atomic(fill); 1567 memset(kaddr, -1, PAGE_SIZE); 1568 kunmap_atomic(kaddr); 1569 flush_dcache_page(fill); 1570 lock_page(fill); 1571 1572 if (!run_lookup_entry(run, 0, &lcn, &clen, &run_idx)) { 1573 err = -ENOENT; 1574 goto out; 1575 } 1576 1577 /* 1578 * TODO: Try blkdev_issue_write_same. 1579 */ 1580 blk_start_plug(&plug); 1581 do { 1582 lbo = (u64)lcn << cluster_bits; 1583 len = (u64)clen << cluster_bits; 1584 new_bio: 1585 new = bio_alloc(bdev, BIO_MAX_VECS, REQ_OP_WRITE, GFP_NOFS); 1586 if (bio) { 1587 bio_chain(bio, new); 1588 submit_bio(bio); 1589 } 1590 bio = new; 1591 bio->bi_iter.bi_sector = lbo >> 9; 1592 1593 for (;;) { 1594 u32 add = len > PAGE_SIZE ? PAGE_SIZE : len; 1595 1596 if (bio_add_page(bio, fill, add, 0) < add) 1597 goto new_bio; 1598 1599 lbo += add; 1600 if (len <= add) 1601 break; 1602 len -= add; 1603 } 1604 } while (run_get_entry(run, ++run_idx, NULL, &lcn, &clen)); 1605 1606 if (!err) 1607 err = submit_bio_wait(bio); 1608 bio_put(bio); 1609 1610 blk_finish_plug(&plug); 1611 out: 1612 unlock_page(fill); 1613 put_page(fill); 1614 1615 return err; 1616 } 1617 1618 int ntfs_vbo_to_lbo(struct ntfs_sb_info *sbi, const struct runs_tree *run, 1619 u64 vbo, u64 *lbo, u64 *bytes) 1620 { 1621 u32 off; 1622 CLST lcn, len; 1623 u8 cluster_bits = sbi->cluster_bits; 1624 1625 if (!run_lookup_entry(run, vbo >> cluster_bits, &lcn, &len, NULL)) 1626 return -ENOENT; 1627 1628 off = vbo & sbi->cluster_mask; 1629 *lbo = lcn == SPARSE_LCN ? -1 : (((u64)lcn << cluster_bits) + off); 1630 *bytes = ((u64)len << cluster_bits) - off; 1631 1632 return 0; 1633 } 1634 1635 struct ntfs_inode *ntfs_new_inode(struct ntfs_sb_info *sbi, CLST rno, bool dir) 1636 { 1637 int err = 0; 1638 struct super_block *sb = sbi->sb; 1639 struct inode *inode = new_inode(sb); 1640 struct ntfs_inode *ni; 1641 1642 if (!inode) 1643 return ERR_PTR(-ENOMEM); 1644 1645 ni = ntfs_i(inode); 1646 1647 err = mi_format_new(&ni->mi, sbi, rno, dir ? RECORD_FLAG_DIR : 0, 1648 false); 1649 if (err) 1650 goto out; 1651 1652 inode->i_ino = rno; 1653 if (insert_inode_locked(inode) < 0) { 1654 err = -EIO; 1655 goto out; 1656 } 1657 1658 out: 1659 if (err) { 1660 iput(inode); 1661 ni = ERR_PTR(err); 1662 } 1663 return ni; 1664 } 1665 1666 /* 1667 * O:BAG:BAD:(A;OICI;FA;;;WD) 1668 * Owner S-1-5-32-544 (Administrators) 1669 * Group S-1-5-32-544 (Administrators) 1670 * ACE: allow S-1-1-0 (Everyone) with FILE_ALL_ACCESS 1671 */ 1672 const u8 s_default_security[] __aligned(8) = { 1673 0x01, 0x00, 0x04, 0x80, 0x30, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 1674 0x00, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x02, 0x00, 0x1C, 0x00, 1675 0x01, 0x00, 0x00, 0x00, 0x00, 0x03, 0x14, 0x00, 0xFF, 0x01, 0x1F, 0x00, 1676 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 1677 0x01, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x20, 0x00, 0x00, 0x00, 1678 0x20, 0x02, 0x00, 0x00, 0x01, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 1679 0x20, 0x00, 0x00, 0x00, 0x20, 0x02, 0x00, 0x00, 1680 }; 1681 1682 static_assert(sizeof(s_default_security) == 0x50); 1683 1684 static inline u32 sid_length(const struct SID *sid) 1685 { 1686 return struct_size(sid, SubAuthority, sid->SubAuthorityCount); 1687 } 1688 1689 /* 1690 * is_acl_valid 1691 * 1692 * Thanks Mark Harmstone for idea. 1693 */ 1694 static bool is_acl_valid(const struct ACL *acl, u32 len) 1695 { 1696 const struct ACE_HEADER *ace; 1697 u32 i; 1698 u16 ace_count, ace_size; 1699 1700 if (acl->AclRevision != ACL_REVISION && 1701 acl->AclRevision != ACL_REVISION_DS) { 1702 /* 1703 * This value should be ACL_REVISION, unless the ACL contains an 1704 * object-specific ACE, in which case this value must be ACL_REVISION_DS. 1705 * All ACEs in an ACL must be at the same revision level. 1706 */ 1707 return false; 1708 } 1709 1710 if (acl->Sbz1) 1711 return false; 1712 1713 if (le16_to_cpu(acl->AclSize) > len) 1714 return false; 1715 1716 if (acl->Sbz2) 1717 return false; 1718 1719 len -= sizeof(struct ACL); 1720 ace = (struct ACE_HEADER *)&acl[1]; 1721 ace_count = le16_to_cpu(acl->AceCount); 1722 1723 for (i = 0; i < ace_count; i++) { 1724 if (len < sizeof(struct ACE_HEADER)) 1725 return false; 1726 1727 ace_size = le16_to_cpu(ace->AceSize); 1728 if (len < ace_size) 1729 return false; 1730 1731 len -= ace_size; 1732 ace = Add2Ptr(ace, ace_size); 1733 } 1734 1735 return true; 1736 } 1737 1738 bool is_sd_valid(const struct SECURITY_DESCRIPTOR_RELATIVE *sd, u32 len) 1739 { 1740 u32 sd_owner, sd_group, sd_sacl, sd_dacl; 1741 1742 if (len < sizeof(struct SECURITY_DESCRIPTOR_RELATIVE)) 1743 return false; 1744 1745 if (sd->Revision != 1) 1746 return false; 1747 1748 if (sd->Sbz1) 1749 return false; 1750 1751 if (!(sd->Control & SE_SELF_RELATIVE)) 1752 return false; 1753 1754 sd_owner = le32_to_cpu(sd->Owner); 1755 if (sd_owner) { 1756 const struct SID *owner = Add2Ptr(sd, sd_owner); 1757 1758 if (sd_owner + offsetof(struct SID, SubAuthority) > len) 1759 return false; 1760 1761 if (owner->Revision != 1) 1762 return false; 1763 1764 if (sd_owner + sid_length(owner) > len) 1765 return false; 1766 } 1767 1768 sd_group = le32_to_cpu(sd->Group); 1769 if (sd_group) { 1770 const struct SID *group = Add2Ptr(sd, sd_group); 1771 1772 if (sd_group + offsetof(struct SID, SubAuthority) > len) 1773 return false; 1774 1775 if (group->Revision != 1) 1776 return false; 1777 1778 if (sd_group + sid_length(group) > len) 1779 return false; 1780 } 1781 1782 sd_sacl = le32_to_cpu(sd->Sacl); 1783 if (sd_sacl) { 1784 const struct ACL *sacl = Add2Ptr(sd, sd_sacl); 1785 1786 if (sd_sacl + sizeof(struct ACL) > len) 1787 return false; 1788 1789 if (!is_acl_valid(sacl, len - sd_sacl)) 1790 return false; 1791 } 1792 1793 sd_dacl = le32_to_cpu(sd->Dacl); 1794 if (sd_dacl) { 1795 const struct ACL *dacl = Add2Ptr(sd, sd_dacl); 1796 1797 if (sd_dacl + sizeof(struct ACL) > len) 1798 return false; 1799 1800 if (!is_acl_valid(dacl, len - sd_dacl)) 1801 return false; 1802 } 1803 1804 return true; 1805 } 1806 1807 /* 1808 * ntfs_security_init - Load and parse $Secure. 1809 */ 1810 int ntfs_security_init(struct ntfs_sb_info *sbi) 1811 { 1812 int err; 1813 struct super_block *sb = sbi->sb; 1814 struct inode *inode; 1815 struct ntfs_inode *ni; 1816 struct MFT_REF ref; 1817 struct ATTRIB *attr; 1818 struct ATTR_LIST_ENTRY *le; 1819 u64 sds_size; 1820 size_t off; 1821 struct NTFS_DE *ne; 1822 struct NTFS_DE_SII *sii_e; 1823 struct ntfs_fnd *fnd_sii = NULL; 1824 const struct INDEX_ROOT *root_sii; 1825 const struct INDEX_ROOT *root_sdh; 1826 struct ntfs_index *indx_sdh = &sbi->security.index_sdh; 1827 struct ntfs_index *indx_sii = &sbi->security.index_sii; 1828 1829 ref.low = cpu_to_le32(MFT_REC_SECURE); 1830 ref.high = 0; 1831 ref.seq = cpu_to_le16(MFT_REC_SECURE); 1832 1833 inode = ntfs_iget5(sb, &ref, &NAME_SECURE); 1834 if (IS_ERR(inode)) { 1835 err = PTR_ERR(inode); 1836 ntfs_err(sb, "Failed to load $Secure."); 1837 inode = NULL; 1838 goto out; 1839 } 1840 1841 ni = ntfs_i(inode); 1842 1843 le = NULL; 1844 1845 attr = ni_find_attr(ni, NULL, &le, ATTR_ROOT, SDH_NAME, 1846 ARRAY_SIZE(SDH_NAME), NULL, NULL); 1847 if (!attr) { 1848 err = -EINVAL; 1849 goto out; 1850 } 1851 1852 root_sdh = resident_data(attr); 1853 if (root_sdh->type != ATTR_ZERO || 1854 root_sdh->rule != NTFS_COLLATION_TYPE_SECURITY_HASH) { 1855 err = -EINVAL; 1856 goto out; 1857 } 1858 1859 err = indx_init(indx_sdh, sbi, attr, INDEX_MUTEX_SDH); 1860 if (err) 1861 goto out; 1862 1863 attr = ni_find_attr(ni, attr, &le, ATTR_ROOT, SII_NAME, 1864 ARRAY_SIZE(SII_NAME), NULL, NULL); 1865 if (!attr) { 1866 err = -EINVAL; 1867 goto out; 1868 } 1869 1870 root_sii = resident_data(attr); 1871 if (root_sii->type != ATTR_ZERO || 1872 root_sii->rule != NTFS_COLLATION_TYPE_UINT) { 1873 err = -EINVAL; 1874 goto out; 1875 } 1876 1877 err = indx_init(indx_sii, sbi, attr, INDEX_MUTEX_SII); 1878 if (err) 1879 goto out; 1880 1881 fnd_sii = fnd_get(); 1882 if (!fnd_sii) { 1883 err = -ENOMEM; 1884 goto out; 1885 } 1886 1887 sds_size = inode->i_size; 1888 1889 /* Find the last valid Id. */ 1890 sbi->security.next_id = SECURITY_ID_FIRST; 1891 /* Always write new security at the end of bucket. */ 1892 sbi->security.next_off = 1893 ALIGN(sds_size - SecurityDescriptorsBlockSize, 16); 1894 1895 off = 0; 1896 ne = NULL; 1897 1898 for (;;) { 1899 u32 next_id; 1900 1901 err = indx_find_raw(indx_sii, ni, root_sii, &ne, &off, fnd_sii); 1902 if (err || !ne) 1903 break; 1904 1905 sii_e = (struct NTFS_DE_SII *)ne; 1906 if (le16_to_cpu(ne->view.data_size) < SIZEOF_SECURITY_HDR) 1907 continue; 1908 1909 next_id = le32_to_cpu(sii_e->sec_id) + 1; 1910 if (next_id >= sbi->security.next_id) 1911 sbi->security.next_id = next_id; 1912 } 1913 1914 sbi->security.ni = ni; 1915 inode = NULL; 1916 out: 1917 iput(inode); 1918 fnd_put(fnd_sii); 1919 1920 return err; 1921 } 1922 1923 /* 1924 * ntfs_get_security_by_id - Read security descriptor by id. 1925 */ 1926 int ntfs_get_security_by_id(struct ntfs_sb_info *sbi, __le32 security_id, 1927 struct SECURITY_DESCRIPTOR_RELATIVE **sd, 1928 size_t *size) 1929 { 1930 int err; 1931 int diff; 1932 struct ntfs_inode *ni = sbi->security.ni; 1933 struct ntfs_index *indx = &sbi->security.index_sii; 1934 void *p = NULL; 1935 struct NTFS_DE_SII *sii_e; 1936 struct ntfs_fnd *fnd_sii; 1937 struct SECURITY_HDR d_security; 1938 const struct INDEX_ROOT *root_sii; 1939 u32 t32; 1940 1941 *sd = NULL; 1942 1943 mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_SECURITY); 1944 1945 fnd_sii = fnd_get(); 1946 if (!fnd_sii) { 1947 err = -ENOMEM; 1948 goto out; 1949 } 1950 1951 root_sii = indx_get_root(indx, ni, NULL, NULL); 1952 if (!root_sii) { 1953 err = -EINVAL; 1954 goto out; 1955 } 1956 1957 /* Try to find this SECURITY descriptor in SII indexes. */ 1958 err = indx_find(indx, ni, root_sii, &security_id, sizeof(security_id), 1959 NULL, &diff, (struct NTFS_DE **)&sii_e, fnd_sii); 1960 if (err) 1961 goto out; 1962 1963 if (diff) 1964 goto out; 1965 1966 t32 = le32_to_cpu(sii_e->sec_hdr.size); 1967 if (t32 < SIZEOF_SECURITY_HDR) { 1968 err = -EINVAL; 1969 goto out; 1970 } 1971 1972 if (t32 > SIZEOF_SECURITY_HDR + 0x10000) { 1973 /* Looks like too big security. 0x10000 - is arbitrary big number. */ 1974 err = -EFBIG; 1975 goto out; 1976 } 1977 1978 *size = t32 - SIZEOF_SECURITY_HDR; 1979 1980 p = kmalloc(*size, GFP_NOFS); 1981 if (!p) { 1982 err = -ENOMEM; 1983 goto out; 1984 } 1985 1986 err = ntfs_read_run_nb(sbi, &ni->file.run, 1987 le64_to_cpu(sii_e->sec_hdr.off), &d_security, 1988 sizeof(d_security), NULL); 1989 if (err) 1990 goto out; 1991 1992 if (memcmp(&d_security, &sii_e->sec_hdr, SIZEOF_SECURITY_HDR)) { 1993 err = -EINVAL; 1994 goto out; 1995 } 1996 1997 err = ntfs_read_run_nb(sbi, &ni->file.run, 1998 le64_to_cpu(sii_e->sec_hdr.off) + 1999 SIZEOF_SECURITY_HDR, 2000 p, *size, NULL); 2001 if (err) 2002 goto out; 2003 2004 *sd = p; 2005 p = NULL; 2006 2007 out: 2008 kfree(p); 2009 fnd_put(fnd_sii); 2010 ni_unlock(ni); 2011 2012 return err; 2013 } 2014 2015 /* 2016 * ntfs_insert_security - Insert security descriptor into $Secure::SDS. 2017 * 2018 * SECURITY Descriptor Stream data is organized into chunks of 256K bytes 2019 * and it contains a mirror copy of each security descriptor. When writing 2020 * to a security descriptor at location X, another copy will be written at 2021 * location (X+256K). 2022 * When writing a security descriptor that will cross the 256K boundary, 2023 * the pointer will be advanced by 256K to skip 2024 * over the mirror portion. 2025 */ 2026 int ntfs_insert_security(struct ntfs_sb_info *sbi, 2027 const struct SECURITY_DESCRIPTOR_RELATIVE *sd, 2028 u32 size_sd, __le32 *security_id, bool *inserted) 2029 { 2030 int err, diff; 2031 struct ntfs_inode *ni = sbi->security.ni; 2032 struct ntfs_index *indx_sdh = &sbi->security.index_sdh; 2033 struct ntfs_index *indx_sii = &sbi->security.index_sii; 2034 struct NTFS_DE_SDH *e; 2035 struct NTFS_DE_SDH sdh_e; 2036 struct NTFS_DE_SII sii_e; 2037 struct SECURITY_HDR *d_security; 2038 u32 new_sec_size = size_sd + SIZEOF_SECURITY_HDR; 2039 u32 aligned_sec_size = ALIGN(new_sec_size, 16); 2040 struct SECURITY_KEY hash_key; 2041 struct ntfs_fnd *fnd_sdh = NULL; 2042 const struct INDEX_ROOT *root_sdh; 2043 const struct INDEX_ROOT *root_sii; 2044 u64 mirr_off, new_sds_size; 2045 u32 next, left; 2046 2047 static_assert((1 << Log2OfSecurityDescriptorsBlockSize) == 2048 SecurityDescriptorsBlockSize); 2049 2050 hash_key.hash = security_hash(sd, size_sd); 2051 hash_key.sec_id = SECURITY_ID_INVALID; 2052 2053 if (inserted) 2054 *inserted = false; 2055 *security_id = SECURITY_ID_INVALID; 2056 2057 /* Allocate a temporal buffer. */ 2058 d_security = kzalloc(aligned_sec_size, GFP_NOFS); 2059 if (!d_security) 2060 return -ENOMEM; 2061 2062 mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_SECURITY); 2063 2064 fnd_sdh = fnd_get(); 2065 if (!fnd_sdh) { 2066 err = -ENOMEM; 2067 goto out; 2068 } 2069 2070 root_sdh = indx_get_root(indx_sdh, ni, NULL, NULL); 2071 if (!root_sdh) { 2072 err = -EINVAL; 2073 goto out; 2074 } 2075 2076 root_sii = indx_get_root(indx_sii, ni, NULL, NULL); 2077 if (!root_sii) { 2078 err = -EINVAL; 2079 goto out; 2080 } 2081 2082 /* 2083 * Check if such security already exists. 2084 * Use "SDH" and hash -> to get the offset in "SDS". 2085 */ 2086 err = indx_find(indx_sdh, ni, root_sdh, &hash_key, sizeof(hash_key), 2087 &d_security->key.sec_id, &diff, (struct NTFS_DE **)&e, 2088 fnd_sdh); 2089 if (err) 2090 goto out; 2091 2092 while (e) { 2093 if (le32_to_cpu(e->sec_hdr.size) == new_sec_size) { 2094 err = ntfs_read_run_nb(sbi, &ni->file.run, 2095 le64_to_cpu(e->sec_hdr.off), 2096 d_security, new_sec_size, NULL); 2097 if (err) 2098 goto out; 2099 2100 if (le32_to_cpu(d_security->size) == new_sec_size && 2101 d_security->key.hash == hash_key.hash && 2102 !memcmp(d_security + 1, sd, size_sd)) { 2103 *security_id = d_security->key.sec_id; 2104 /* Such security already exists. */ 2105 err = 0; 2106 goto out; 2107 } 2108 } 2109 2110 err = indx_find_sort(indx_sdh, ni, root_sdh, 2111 (struct NTFS_DE **)&e, fnd_sdh); 2112 if (err) 2113 goto out; 2114 2115 if (!e || e->key.hash != hash_key.hash) 2116 break; 2117 } 2118 2119 /* Zero unused space. */ 2120 next = sbi->security.next_off & (SecurityDescriptorsBlockSize - 1); 2121 left = SecurityDescriptorsBlockSize - next; 2122 2123 /* Zero gap until SecurityDescriptorsBlockSize. */ 2124 if (left < new_sec_size) { 2125 /* Zero "left" bytes from sbi->security.next_off. */ 2126 sbi->security.next_off += SecurityDescriptorsBlockSize + left; 2127 } 2128 2129 /* Zero tail of previous security. */ 2130 //used = ni->vfs_inode.i_size & (SecurityDescriptorsBlockSize - 1); 2131 2132 /* 2133 * Example: 2134 * 0x40438 == ni->vfs_inode.i_size 2135 * 0x00440 == sbi->security.next_off 2136 * need to zero [0x438-0x440) 2137 * if (next > used) { 2138 * u32 tozero = next - used; 2139 * zero "tozero" bytes from sbi->security.next_off - tozero 2140 */ 2141 2142 /* Format new security descriptor. */ 2143 d_security->key.hash = hash_key.hash; 2144 d_security->key.sec_id = cpu_to_le32(sbi->security.next_id); 2145 d_security->off = cpu_to_le64(sbi->security.next_off); 2146 d_security->size = cpu_to_le32(new_sec_size); 2147 memcpy(d_security + 1, sd, size_sd); 2148 2149 /* Write main SDS bucket. */ 2150 err = ntfs_sb_write_run(sbi, &ni->file.run, sbi->security.next_off, 2151 d_security, aligned_sec_size, 0); 2152 2153 if (err) 2154 goto out; 2155 2156 mirr_off = sbi->security.next_off + SecurityDescriptorsBlockSize; 2157 new_sds_size = mirr_off + aligned_sec_size; 2158 2159 if (new_sds_size > ni->vfs_inode.i_size) { 2160 err = attr_set_size(ni, ATTR_DATA, SDS_NAME, 2161 ARRAY_SIZE(SDS_NAME), &ni->file.run, 2162 new_sds_size, &new_sds_size, false, NULL); 2163 if (err) 2164 goto out; 2165 } 2166 2167 /* Write copy SDS bucket. */ 2168 err = ntfs_sb_write_run(sbi, &ni->file.run, mirr_off, d_security, 2169 aligned_sec_size, 0); 2170 if (err) 2171 goto out; 2172 2173 /* Fill SII entry. */ 2174 sii_e.de.view.data_off = 2175 cpu_to_le16(offsetof(struct NTFS_DE_SII, sec_hdr)); 2176 sii_e.de.view.data_size = cpu_to_le16(SIZEOF_SECURITY_HDR); 2177 sii_e.de.view.res = 0; 2178 sii_e.de.size = cpu_to_le16(SIZEOF_SII_DIRENTRY); 2179 sii_e.de.key_size = cpu_to_le16(sizeof(d_security->key.sec_id)); 2180 sii_e.de.flags = 0; 2181 sii_e.de.res = 0; 2182 sii_e.sec_id = d_security->key.sec_id; 2183 memcpy(&sii_e.sec_hdr, d_security, SIZEOF_SECURITY_HDR); 2184 2185 err = indx_insert_entry(indx_sii, ni, &sii_e.de, NULL, NULL, 0); 2186 if (err) 2187 goto out; 2188 2189 /* Fill SDH entry. */ 2190 sdh_e.de.view.data_off = 2191 cpu_to_le16(offsetof(struct NTFS_DE_SDH, sec_hdr)); 2192 sdh_e.de.view.data_size = cpu_to_le16(SIZEOF_SECURITY_HDR); 2193 sdh_e.de.view.res = 0; 2194 sdh_e.de.size = cpu_to_le16(SIZEOF_SDH_DIRENTRY); 2195 sdh_e.de.key_size = cpu_to_le16(sizeof(sdh_e.key)); 2196 sdh_e.de.flags = 0; 2197 sdh_e.de.res = 0; 2198 sdh_e.key.hash = d_security->key.hash; 2199 sdh_e.key.sec_id = d_security->key.sec_id; 2200 memcpy(&sdh_e.sec_hdr, d_security, SIZEOF_SECURITY_HDR); 2201 sdh_e.magic[0] = cpu_to_le16('I'); 2202 sdh_e.magic[1] = cpu_to_le16('I'); 2203 2204 fnd_clear(fnd_sdh); 2205 err = indx_insert_entry(indx_sdh, ni, &sdh_e.de, (void *)(size_t)1, 2206 fnd_sdh, 0); 2207 if (err) 2208 goto out; 2209 2210 *security_id = d_security->key.sec_id; 2211 if (inserted) 2212 *inserted = true; 2213 2214 /* Update Id and offset for next descriptor. */ 2215 sbi->security.next_id += 1; 2216 sbi->security.next_off += aligned_sec_size; 2217 2218 out: 2219 fnd_put(fnd_sdh); 2220 mark_inode_dirty(&ni->vfs_inode); 2221 ni_unlock(ni); 2222 kfree(d_security); 2223 2224 return err; 2225 } 2226 2227 /* 2228 * ntfs_reparse_init - Load and parse $Extend/$Reparse. 2229 */ 2230 int ntfs_reparse_init(struct ntfs_sb_info *sbi) 2231 { 2232 int err; 2233 struct ntfs_inode *ni = sbi->reparse.ni; 2234 struct ntfs_index *indx = &sbi->reparse.index_r; 2235 struct ATTRIB *attr; 2236 struct ATTR_LIST_ENTRY *le; 2237 const struct INDEX_ROOT *root_r; 2238 2239 if (!ni) 2240 return 0; 2241 2242 le = NULL; 2243 attr = ni_find_attr(ni, NULL, &le, ATTR_ROOT, SR_NAME, 2244 ARRAY_SIZE(SR_NAME), NULL, NULL); 2245 if (!attr) { 2246 err = -EINVAL; 2247 goto out; 2248 } 2249 2250 root_r = resident_data(attr); 2251 if (root_r->type != ATTR_ZERO || 2252 root_r->rule != NTFS_COLLATION_TYPE_UINTS) { 2253 err = -EINVAL; 2254 goto out; 2255 } 2256 2257 err = indx_init(indx, sbi, attr, INDEX_MUTEX_SR); 2258 if (err) 2259 goto out; 2260 2261 out: 2262 return err; 2263 } 2264 2265 /* 2266 * ntfs_objid_init - Load and parse $Extend/$ObjId. 2267 */ 2268 int ntfs_objid_init(struct ntfs_sb_info *sbi) 2269 { 2270 int err; 2271 struct ntfs_inode *ni = sbi->objid.ni; 2272 struct ntfs_index *indx = &sbi->objid.index_o; 2273 struct ATTRIB *attr; 2274 struct ATTR_LIST_ENTRY *le; 2275 const struct INDEX_ROOT *root; 2276 2277 if (!ni) 2278 return 0; 2279 2280 le = NULL; 2281 attr = ni_find_attr(ni, NULL, &le, ATTR_ROOT, SO_NAME, 2282 ARRAY_SIZE(SO_NAME), NULL, NULL); 2283 if (!attr) { 2284 err = -EINVAL; 2285 goto out; 2286 } 2287 2288 root = resident_data(attr); 2289 if (root->type != ATTR_ZERO || 2290 root->rule != NTFS_COLLATION_TYPE_UINTS) { 2291 err = -EINVAL; 2292 goto out; 2293 } 2294 2295 err = indx_init(indx, sbi, attr, INDEX_MUTEX_SO); 2296 if (err) 2297 goto out; 2298 2299 out: 2300 return err; 2301 } 2302 2303 int ntfs_objid_remove(struct ntfs_sb_info *sbi, struct GUID *guid) 2304 { 2305 int err; 2306 struct ntfs_inode *ni = sbi->objid.ni; 2307 struct ntfs_index *indx = &sbi->objid.index_o; 2308 2309 if (!ni) 2310 return -EINVAL; 2311 2312 mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_OBJID); 2313 2314 err = indx_delete_entry(indx, ni, guid, sizeof(*guid), NULL); 2315 2316 mark_inode_dirty(&ni->vfs_inode); 2317 ni_unlock(ni); 2318 2319 return err; 2320 } 2321 2322 int ntfs_insert_reparse(struct ntfs_sb_info *sbi, __le32 rtag, 2323 const struct MFT_REF *ref) 2324 { 2325 int err; 2326 struct ntfs_inode *ni = sbi->reparse.ni; 2327 struct ntfs_index *indx = &sbi->reparse.index_r; 2328 struct NTFS_DE_R re; 2329 2330 if (!ni) 2331 return -EINVAL; 2332 2333 memset(&re, 0, sizeof(re)); 2334 2335 re.de.view.data_off = cpu_to_le16(offsetof(struct NTFS_DE_R, zero)); 2336 re.de.size = cpu_to_le16(sizeof(struct NTFS_DE_R)); 2337 re.de.key_size = cpu_to_le16(sizeof(re.key)); 2338 2339 re.key.ReparseTag = rtag; 2340 memcpy(&re.key.ref, ref, sizeof(*ref)); 2341 2342 mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_REPARSE); 2343 2344 err = indx_insert_entry(indx, ni, &re.de, NULL, NULL, 0); 2345 2346 mark_inode_dirty(&ni->vfs_inode); 2347 ni_unlock(ni); 2348 2349 return err; 2350 } 2351 2352 int ntfs_remove_reparse(struct ntfs_sb_info *sbi, __le32 rtag, 2353 const struct MFT_REF *ref) 2354 { 2355 int err, diff; 2356 struct ntfs_inode *ni = sbi->reparse.ni; 2357 struct ntfs_index *indx = &sbi->reparse.index_r; 2358 struct ntfs_fnd *fnd = NULL; 2359 struct REPARSE_KEY rkey; 2360 struct NTFS_DE_R *re; 2361 struct INDEX_ROOT *root_r; 2362 2363 if (!ni) 2364 return -EINVAL; 2365 2366 rkey.ReparseTag = rtag; 2367 rkey.ref = *ref; 2368 2369 mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_REPARSE); 2370 2371 if (rtag) { 2372 err = indx_delete_entry(indx, ni, &rkey, sizeof(rkey), NULL); 2373 goto out1; 2374 } 2375 2376 fnd = fnd_get(); 2377 if (!fnd) { 2378 err = -ENOMEM; 2379 goto out1; 2380 } 2381 2382 root_r = indx_get_root(indx, ni, NULL, NULL); 2383 if (!root_r) { 2384 err = -EINVAL; 2385 goto out; 2386 } 2387 2388 /* 1 - forces to ignore rkey.ReparseTag when comparing keys. */ 2389 err = indx_find(indx, ni, root_r, &rkey, sizeof(rkey), (void *)1, &diff, 2390 (struct NTFS_DE **)&re, fnd); 2391 if (err) 2392 goto out; 2393 2394 if (memcmp(&re->key.ref, ref, sizeof(*ref))) { 2395 /* Impossible. Looks like volume corrupt? */ 2396 goto out; 2397 } 2398 2399 memcpy(&rkey, &re->key, sizeof(rkey)); 2400 2401 fnd_put(fnd); 2402 fnd = NULL; 2403 2404 err = indx_delete_entry(indx, ni, &rkey, sizeof(rkey), NULL); 2405 if (err) 2406 goto out; 2407 2408 out: 2409 fnd_put(fnd); 2410 2411 out1: 2412 mark_inode_dirty(&ni->vfs_inode); 2413 ni_unlock(ni); 2414 2415 return err; 2416 } 2417 2418 static inline void ntfs_unmap_and_discard(struct ntfs_sb_info *sbi, CLST lcn, 2419 CLST len) 2420 { 2421 ntfs_unmap_meta(sbi->sb, lcn, len); 2422 ntfs_discard(sbi, lcn, len); 2423 } 2424 2425 void mark_as_free_ex(struct ntfs_sb_info *sbi, CLST lcn, CLST len, bool trim) 2426 { 2427 CLST end, i; 2428 struct wnd_bitmap *wnd = &sbi->used.bitmap; 2429 2430 down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_CLUSTERS); 2431 if (!wnd_is_used(wnd, lcn, len)) { 2432 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 2433 2434 end = lcn + len; 2435 len = 0; 2436 for (i = lcn; i < end; i++) { 2437 if (wnd_is_used(wnd, i, 1)) { 2438 if (!len) 2439 lcn = i; 2440 len += 1; 2441 continue; 2442 } 2443 2444 if (!len) 2445 continue; 2446 2447 if (trim) 2448 ntfs_unmap_and_discard(sbi, lcn, len); 2449 2450 wnd_set_free(wnd, lcn, len); 2451 len = 0; 2452 } 2453 2454 if (!len) 2455 goto out; 2456 } 2457 2458 if (trim) 2459 ntfs_unmap_and_discard(sbi, lcn, len); 2460 wnd_set_free(wnd, lcn, len); 2461 2462 out: 2463 up_write(&wnd->rw_lock); 2464 } 2465 2466 /* 2467 * run_deallocate - Deallocate clusters. 2468 */ 2469 int run_deallocate(struct ntfs_sb_info *sbi, struct runs_tree *run, bool trim) 2470 { 2471 CLST lcn, len; 2472 size_t idx = 0; 2473 2474 while (run_get_entry(run, idx++, NULL, &lcn, &len)) { 2475 if (lcn == SPARSE_LCN) 2476 continue; 2477 2478 mark_as_free_ex(sbi, lcn, len, trim); 2479 } 2480 2481 return 0; 2482 } 2483