fs/ntfs3/inode.c

   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/buffer_head.h>
   9 #include <linux/fs.h>
  10 #include <linux/mpage.h>
  11 #include <linux/namei.h>
  12 #include <linux/nls.h>
  13 #include <linux/uio.h>
  14 #include <linux/writeback.h>
  15
  16 #include "debug.h"
  17 #include "ntfs.h"
  18 #include "ntfs_fs.h"
  19
  20 /*
  21  * ntfs_read_mft - Read record and parses MFT.
  22  */
  23 static struct inode *ntfs_read_mft(struct inode *inode,
  24                                    const struct cpu_str *name,
  25                                    const struct MFT_REF *ref)
  26 {
  27         int err = 0;
  28         struct ntfs_inode *ni = ntfs_i(inode);
  29         struct super_block *sb = inode->i_sb;
  30         struct ntfs_sb_info *sbi = sb->s_fs_info;
  31         mode_t mode = 0;
  32         struct ATTR_STD_INFO5 *std5 = NULL;
  33         struct ATTR_LIST_ENTRY *le;
  34         struct ATTRIB *attr;
  35         bool is_match = false;
  36         bool is_root = false;
  37         bool is_dir;
  38         unsigned long ino = inode->i_ino;
  39         u32 rp_fa = 0, asize, t32;
  40         u16 roff, rsize, names = 0;
  41         const struct ATTR_FILE_NAME *fname = NULL;
  42         const struct INDEX_ROOT *root;
  43         struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
  44         u64 t64;
  45         struct MFT_REC *rec;
  46         struct runs_tree *run;
  47
  48         inode->i_op = NULL;
  49         /* Setup 'uid' and 'gid' */
  50         inode->i_uid = sbi->options->fs_uid;
  51         inode->i_gid = sbi->options->fs_gid;
  52
  53         err = mi_init(&ni->mi, sbi, ino);
  54         if (err)
  55                 goto out;
  56
  57         if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
  58                 t64 = sbi->mft.lbo >> sbi->cluster_bits;
  59                 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
  60                 sbi->mft.ni = ni;
  61                 init_rwsem(&ni->file.run_lock);
  62
  63                 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
  64                         err = -ENOMEM;
  65                         goto out;
  66                 }
  67         }
  68
  69         err = mi_read(&ni->mi, ino == MFT_REC_MFT);
  70
  71         if (err)
  72                 goto out;
  73
  74         rec = ni->mi.mrec;
  75
  76         if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
  77                 ;
  78         } else if (ref->seq != rec->seq) {
  79                 err = -EINVAL;
  80                 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
  81                          le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
  82                 goto out;
  83         } else if (!is_rec_inuse(rec)) {
  84                 err = -ESTALE;
  85                 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
  86                 goto out;
  87         }
  88
  89         if (le32_to_cpu(rec->total) != sbi->record_size) {
  90                 /* Bad inode? */
  91                 err = -EINVAL;
  92                 goto out;
  93         }
  94
  95         if (!is_rec_base(rec)) {
  96                 err = -EINVAL;
  97                 goto out;
  98         }
  99
 100         /* Record should contain $I30 root. */
 101         is_dir = rec->flags & RECORD_FLAG_DIR;
 102
 103         /* MFT_REC_MFT is not a dir */
 104         if (is_dir && ino == MFT_REC_MFT) {
 105                 err = -EINVAL;
 106                 goto out;
 107         }
 108
 109         inode->i_generation = le16_to_cpu(rec->seq);
 110
 111         /* Enumerate all struct Attributes MFT. */
 112         le = NULL;
 113         attr = NULL;
 114
 115         /*
 116          * To reduce tab pressure use goto instead of
 117          * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
 118          */
 119 next_attr:
 120         run = NULL;
 121         err = -EINVAL;
 122         attr = ni_enum_attr_ex(ni, attr, &le, NULL);
 123         if (!attr)
 124                 goto end_enum;
 125
 126         if (le && le->vcn) {
 127                 /* This is non primary attribute segment. Ignore if not MFT. */
 128                 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
 129                         goto next_attr;
 130
 131                 run = &ni->file.run;
 132                 asize = le32_to_cpu(attr->size);
 133                 goto attr_unpack_run;
 134         }
 135
 136         roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
 137         rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
 138         asize = le32_to_cpu(attr->size);
 139
 140         if (le16_to_cpu(attr->name_off) + attr->name_len > asize)
 141                 goto out;
 142
 143         if (attr->non_res) {
 144                 t64 = le64_to_cpu(attr->nres.alloc_size);
 145                 if (le64_to_cpu(attr->nres.data_size) > t64 ||
 146                     le64_to_cpu(attr->nres.valid_size) > t64)
 147                         goto out;
 148         }
 149
 150         switch (attr->type) {
 151         case ATTR_STD:
 152                 if (attr->non_res ||
 153                     asize < sizeof(struct ATTR_STD_INFO) + roff ||
 154                     rsize < sizeof(struct ATTR_STD_INFO))
 155                         goto out;
 156
 157                 if (std5)
 158                         goto next_attr;
 159
 160                 std5 = Add2Ptr(attr, roff);
 161
 162 #ifdef STATX_BTIME
 163                 nt2kernel(std5->cr_time, &ni->i_crtime);
 164 #endif
 165                 nt2kernel(std5->a_time, &inode->i_atime);
 166                 nt2kernel(std5->c_time, &inode->i_ctime);
 167                 nt2kernel(std5->m_time, &inode->i_mtime);
 168
 169                 ni->std_fa = std5->fa;
 170
 171                 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
 172                     rsize >= sizeof(struct ATTR_STD_INFO5))
 173                         ni->std_security_id = std5->security_id;
 174                 goto next_attr;
 175
 176         case ATTR_LIST:
 177                 if (attr->name_len || le || ino == MFT_REC_LOG)
 178                         goto out;
 179
 180                 err = ntfs_load_attr_list(ni, attr);
 181                 if (err)
 182                         goto out;
 183
 184                 le = NULL;
 185                 attr = NULL;
 186                 goto next_attr;
 187
 188         case ATTR_NAME:
 189                 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
 190                     rsize < SIZEOF_ATTRIBUTE_FILENAME)
 191                         goto out;
 192
 193                 fname = Add2Ptr(attr, roff);
 194                 if (fname->type == FILE_NAME_DOS)
 195                         goto next_attr;
 196
 197                 names += 1;
 198                 if (name && name->len == fname->name_len &&
 199                     !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
 200                                         NULL, false))
 201                         is_match = true;
 202
 203                 goto next_attr;
 204
 205         case ATTR_DATA:
 206                 if (is_dir) {
 207                         /* Ignore data attribute in dir record. */
 208                         goto next_attr;
 209                 }
 210
 211                 if (ino == MFT_REC_BADCLUST && !attr->non_res)
 212                         goto next_attr;
 213
 214                 if (attr->name_len &&
 215                     ((ino != MFT_REC_BADCLUST || !attr->non_res ||
 216                       attr->name_len != ARRAY_SIZE(BAD_NAME) ||
 217                       memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
 218                      (ino != MFT_REC_SECURE || !attr->non_res ||
 219                       attr->name_len != ARRAY_SIZE(SDS_NAME) ||
 220                       memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
 221                         /* File contains stream attribute. Ignore it. */
 222                         goto next_attr;
 223                 }
 224
 225                 if (is_attr_sparsed(attr))
 226                         ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
 227                 else
 228                         ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
 229
 230                 if (is_attr_compressed(attr))
 231                         ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
 232                 else
 233                         ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
 234
 235                 if (is_attr_encrypted(attr))
 236                         ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
 237                 else
 238                         ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
 239
 240                 if (!attr->non_res) {
 241                         ni->i_valid = inode->i_size = rsize;
 242                         inode_set_bytes(inode, rsize);
 243                 }
 244
 245                 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
 246
 247                 if (!attr->non_res) {
 248                         ni->ni_flags |= NI_FLAG_RESIDENT;
 249                         goto next_attr;
 250                 }
 251
 252                 inode_set_bytes(inode, attr_ondisk_size(attr));
 253
 254                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 255                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 256                 if (!attr->nres.alloc_size)
 257                         goto next_attr;
 258
 259                 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run
 260                                             : &ni->file.run;
 261                 break;
 262
 263         case ATTR_ROOT:
 264                 if (attr->non_res)
 265                         goto out;
 266
 267                 root = Add2Ptr(attr, roff);
 268
 269                 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
 270                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 271                         goto next_attr;
 272
 273                 if (root->type != ATTR_NAME ||
 274                     root->rule != NTFS_COLLATION_TYPE_FILENAME)
 275                         goto out;
 276
 277                 if (!is_dir)
 278                         goto next_attr;
 279
 280                 is_root = true;
 281                 ni->ni_flags |= NI_FLAG_DIR;
 282
 283                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
 284                 if (err)
 285                         goto out;
 286
 287                 mode = sb->s_root
 288                                ? (S_IFDIR | (0777 & sbi->options->fs_dmask_inv))
 289                                : (S_IFDIR | 0777);
 290                 goto next_attr;
 291
 292         case ATTR_ALLOC:
 293                 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
 294                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 295                         goto next_attr;
 296
 297                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 298                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 299                 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
 300
 301                 run = &ni->dir.alloc_run;
 302                 break;
 303
 304         case ATTR_BITMAP:
 305                 if (ino == MFT_REC_MFT) {
 306                         if (!attr->non_res)
 307                                 goto out;
 308 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
 309                         /* 0x20000000 = 2^32 / 8 */
 310                         if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
 311                                 goto out;
 312 #endif
 313                         run = &sbi->mft.bitmap.run;
 314                         break;
 315                 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
 316                            !memcmp(attr_name(attr), I30_NAME,
 317                                    sizeof(I30_NAME)) &&
 318                            attr->non_res) {
 319                         run = &ni->dir.bitmap_run;
 320                         break;
 321                 }
 322                 goto next_attr;
 323
 324         case ATTR_REPARSE:
 325                 if (attr->name_len)
 326                         goto next_attr;
 327
 328                 rp_fa = ni_parse_reparse(ni, attr, &rp);
 329                 switch (rp_fa) {
 330                 case REPARSE_LINK:
 331                         /*
 332                          * Normal symlink.
 333                          * Assume one unicode symbol == one utf8.
 334                          */
 335                         inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
 336                                                             .PrintNameLength) /
 337                                         sizeof(u16);
 338
 339                         ni->i_valid = inode->i_size;
 340
 341                         /* Clear directory bit. */
 342                         if (ni->ni_flags & NI_FLAG_DIR) {
 343                                 indx_clear(&ni->dir);
 344                                 memset(&ni->dir, 0, sizeof(ni->dir));
 345                                 ni->ni_flags &= ~NI_FLAG_DIR;
 346                         } else {
 347                                 run_close(&ni->file.run);
 348                         }
 349                         mode = S_IFLNK | 0777;
 350                         is_dir = false;
 351                         if (attr->non_res) {
 352                                 run = &ni->file.run;
 353                                 goto attr_unpack_run; // Double break.
 354                         }
 355                         break;
 356
 357                 case REPARSE_COMPRESSED:
 358                         break;
 359
 360                 case REPARSE_DEDUPLICATED:
 361                         break;
 362                 }
 363                 goto next_attr;
 364
 365         case ATTR_EA_INFO:
 366                 if (!attr->name_len &&
 367                     resident_data_ex(attr, sizeof(struct EA_INFO))) {
 368                         ni->ni_flags |= NI_FLAG_EA;
 369                         /*
 370                          * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
 371                          */
 372                         inode->i_mode = mode;
 373                         ntfs_get_wsl_perm(inode);
 374                         mode = inode->i_mode;
 375                 }
 376                 goto next_attr;
 377
 378         default:
 379                 goto next_attr;
 380         }
 381
 382 attr_unpack_run:
 383         roff = le16_to_cpu(attr->nres.run_off);
 384
 385         if (roff > asize) {
 386                 err = -EINVAL;
 387                 goto out;
 388         }
 389
 390         t64 = le64_to_cpu(attr->nres.svcn);
 391
 392         err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
 393                             t64, Add2Ptr(attr, roff), asize - roff);
 394         if (err < 0)
 395                 goto out;
 396         err = 0;
 397         goto next_attr;
 398
 399 end_enum:
 400
 401         if (!std5)
 402                 goto out;
 403
 404         if (!is_match && name) {
 405                 /* Reuse rec as buffer for ascii name. */
 406                 err = -ENOENT;
 407                 goto out;
 408         }
 409
 410         if (std5->fa & FILE_ATTRIBUTE_READONLY)
 411                 mode &= ~0222;
 412
 413         if (!names) {
 414                 err = -EINVAL;
 415                 goto out;
 416         }
 417
 418         if (names != le16_to_cpu(rec->hard_links)) {
 419                 /* Correct minor error on the fly. Do not mark inode as dirty. */
 420                 rec->hard_links = cpu_to_le16(names);
 421                 ni->mi.dirty = true;
 422         }
 423
 424         set_nlink(inode, names);
 425
 426         if (S_ISDIR(mode)) {
 427                 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
 428
 429                 /*
 430                  * Dot and dot-dot should be included in count but was not
 431                  * included in enumeration.
 432                  * Usually a hard links to directories are disabled.
 433                  */
 434                 inode->i_op = &ntfs_dir_inode_operations;
 435                 inode->i_fop = &ntfs_dir_operations;
 436                 ni->i_valid = 0;
 437         } else if (S_ISLNK(mode)) {
 438                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 439                 inode->i_op = &ntfs_link_inode_operations;
 440                 inode->i_fop = NULL;
 441                 inode_nohighmem(inode);
 442         } else if (S_ISREG(mode)) {
 443                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 444                 inode->i_op = &ntfs_file_inode_operations;
 445                 inode->i_fop = &ntfs_file_operations;
 446                 inode->i_mapping->a_ops =
 447                         is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
 448                 if (ino != MFT_REC_MFT)
 449                         init_rwsem(&ni->file.run_lock);
 450         } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
 451                    S_ISSOCK(mode)) {
 452                 inode->i_op = &ntfs_special_inode_operations;
 453                 init_special_inode(inode, mode, inode->i_rdev);
 454         } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
 455                    fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
 456                 /* Records in $Extend are not a files or general directories. */
 457                 inode->i_op = &ntfs_file_inode_operations;
 458         } else {
 459                 err = -EINVAL;
 460                 goto out;
 461         }
 462
 463         if ((sbi->options->sys_immutable &&
 464              (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
 465             !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
 466                 inode->i_flags |= S_IMMUTABLE;
 467         } else {
 468                 inode->i_flags &= ~S_IMMUTABLE;
 469         }
 470
 471         inode->i_mode = mode;
 472         if (!(ni->ni_flags & NI_FLAG_EA)) {
 473                 /* If no xattr then no security (stored in xattr). */
 474                 inode->i_flags |= S_NOSEC;
 475         }
 476
 477         if (ino == MFT_REC_MFT && !sb->s_root)
 478                 sbi->mft.ni = NULL;
 479
 480         unlock_new_inode(inode);
 481
 482         return inode;
 483
 484 out:
 485         if (ino == MFT_REC_MFT && !sb->s_root)
 486                 sbi->mft.ni = NULL;
 487
 488         iget_failed(inode);
 489         return ERR_PTR(err);
 490 }
 491
 492 /*
 493  * ntfs_test_inode
 494  *
 495  * Return: 1 if match.
 496  */
 497 static int ntfs_test_inode(struct inode *inode, void *data)
 498 {
 499         struct MFT_REF *ref = data;
 500
 501         return ino_get(ref) == inode->i_ino;
 502 }
 503
 504 static int ntfs_set_inode(struct inode *inode, void *data)
 505 {
 506         const struct MFT_REF *ref = data;
 507
 508         inode->i_ino = ino_get(ref);
 509         return 0;
 510 }
 511
 512 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
 513                          const struct cpu_str *name)
 514 {
 515         struct inode *inode;
 516
 517         inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
 518                              (void *)ref);
 519         if (unlikely(!inode))
 520                 return ERR_PTR(-ENOMEM);
 521
 522         /* If this is a freshly allocated inode, need to read it now. */
 523         if (inode->i_state & I_NEW)
 524                 inode = ntfs_read_mft(inode, name, ref);
 525         else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
 526                 /* Inode overlaps? */
 527                 make_bad_inode(inode);
 528         }
 529
 530         if (IS_ERR(inode) && name)
 531                 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
 532
 533         return inode;
 534 }
 535
 536 enum get_block_ctx {
 537         GET_BLOCK_GENERAL = 0,
 538         GET_BLOCK_WRITE_BEGIN = 1,
 539         GET_BLOCK_DIRECT_IO_R = 2,
 540         GET_BLOCK_DIRECT_IO_W = 3,
 541         GET_BLOCK_BMAP = 4,
 542 };
 543
 544 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
 545                                        struct buffer_head *bh, int create,
 546                                        enum get_block_ctx ctx)
 547 {
 548         struct super_block *sb = inode->i_sb;
 549         struct ntfs_sb_info *sbi = sb->s_fs_info;
 550         struct ntfs_inode *ni = ntfs_i(inode);
 551         struct page *page = bh->b_page;
 552         u8 cluster_bits = sbi->cluster_bits;
 553         u32 block_size = sb->s_blocksize;
 554         u64 bytes, lbo, valid;
 555         u32 off;
 556         int err;
 557         CLST vcn, lcn, len;
 558         bool new;
 559
 560         /* Clear previous state. */
 561         clear_buffer_new(bh);
 562         clear_buffer_uptodate(bh);
 563
 564         /* Direct write uses 'create=0'. */
 565         if (!create && vbo >= ni->i_valid) {
 566                 /* Out of valid. */
 567                 return 0;
 568         }
 569
 570         if (vbo >= inode->i_size) {
 571                 /* Out of size. */
 572                 return 0;
 573         }
 574
 575         if (is_resident(ni)) {
 576                 ni_lock(ni);
 577                 err = attr_data_read_resident(ni, page);
 578                 ni_unlock(ni);
 579
 580                 if (!err)
 581                         set_buffer_uptodate(bh);
 582                 bh->b_size = block_size;
 583                 return err;
 584         }
 585
 586         vcn = vbo >> cluster_bits;
 587         off = vbo & sbi->cluster_mask;
 588         new = false;
 589
 590         err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL);
 591         if (err)
 592                 goto out;
 593
 594         if (!len)
 595                 return 0;
 596
 597         bytes = ((u64)len << cluster_bits) - off;
 598
 599         if (lcn == SPARSE_LCN) {
 600                 if (!create) {
 601                         if (bh->b_size > bytes)
 602                                 bh->b_size = bytes;
 603                         return 0;
 604                 }
 605                 WARN_ON(1);
 606         }
 607
 608         if (new) {
 609                 set_buffer_new(bh);
 610                 if ((len << cluster_bits) > block_size)
 611                         ntfs_sparse_cluster(inode, page, vcn, len);
 612         }
 613
 614         lbo = ((u64)lcn << cluster_bits) + off;
 615
 616         set_buffer_mapped(bh);
 617         bh->b_bdev = sb->s_bdev;
 618         bh->b_blocknr = lbo >> sb->s_blocksize_bits;
 619
 620         valid = ni->i_valid;
 621
 622         if (ctx == GET_BLOCK_DIRECT_IO_W) {
 623                 /* ntfs_direct_IO will update ni->i_valid. */
 624                 if (vbo >= valid)
 625                         set_buffer_new(bh);
 626         } else if (create) {
 627                 /* Normal write. */
 628                 if (bytes > bh->b_size)
 629                         bytes = bh->b_size;
 630
 631                 if (vbo >= valid)
 632                         set_buffer_new(bh);
 633
 634                 if (vbo + bytes > valid) {
 635                         ni->i_valid = vbo + bytes;
 636                         mark_inode_dirty(inode);
 637                 }
 638         } else if (vbo >= valid) {
 639                 /* Read out of valid data. */
 640                 /* Should never be here 'cause already checked. */
 641                 clear_buffer_mapped(bh);
 642         } else if (vbo + bytes <= valid) {
 643                 /* Normal read. */
 644         } else if (vbo + block_size <= valid) {
 645                 /* Normal short read. */
 646                 bytes = block_size;
 647         } else {
 648                 /*
 649                  * Read across valid size: vbo < valid && valid < vbo + block_size
 650                  */
 651                 bytes = block_size;
 652
 653                 if (page) {
 654                         u32 voff = valid - vbo;
 655
 656                         bh->b_size = block_size;
 657                         off = vbo & (PAGE_SIZE - 1);
 658                         set_bh_page(bh, page, off);
 659                         ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 660                         wait_on_buffer(bh);
 661                         if (!buffer_uptodate(bh)) {
 662                                 err = -EIO;
 663                                 goto out;
 664                         }
 665                         zero_user_segment(page, off + voff, off + block_size);
 666                 }
 667         }
 668
 669         if (bh->b_size > bytes)
 670                 bh->b_size = bytes;
 671
 672 #ifndef __LP64__
 673         if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
 674                 static_assert(sizeof(size_t) < sizeof(loff_t));
 675                 if (bytes > 0x40000000u)
 676                         bh->b_size = 0x40000000u;
 677         }
 678 #endif
 679
 680         return 0;
 681
 682 out:
 683         return err;
 684 }
 685
 686 int ntfs_get_block(struct inode *inode, sector_t vbn,
 687                    struct buffer_head *bh_result, int create)
 688 {
 689         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 690                                   bh_result, create, GET_BLOCK_GENERAL);
 691 }
 692
 693 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
 694                                struct buffer_head *bh_result, int create)
 695 {
 696         return ntfs_get_block_vbo(inode,
 697                                   (u64)vsn << inode->i_sb->s_blocksize_bits,
 698                                   bh_result, create, GET_BLOCK_BMAP);
 699 }
 700
 701 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
 702 {
 703         return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
 704 }
 705
 706 static int ntfs_readpage(struct file *file, struct page *page)
 707 {
 708         int err;
 709         struct address_space *mapping = page->mapping;
 710         struct inode *inode = mapping->host;
 711         struct ntfs_inode *ni = ntfs_i(inode);
 712
 713         if (is_resident(ni)) {
 714                 ni_lock(ni);
 715                 err = attr_data_read_resident(ni, page);
 716                 ni_unlock(ni);
 717                 if (err != E_NTFS_NONRESIDENT) {
 718                         unlock_page(page);
 719                         return err;
 720                 }
 721         }
 722
 723         if (is_compressed(ni)) {
 724                 ni_lock(ni);
 725                 err = ni_readpage_cmpr(ni, page);
 726                 ni_unlock(ni);
 727                 return err;
 728         }
 729
 730         /* Normal + sparse files. */
 731         return mpage_readpage(page, ntfs_get_block);
 732 }
 733
 734 static void ntfs_readahead(struct readahead_control *rac)
 735 {
 736         struct address_space *mapping = rac->mapping;
 737         struct inode *inode = mapping->host;
 738         struct ntfs_inode *ni = ntfs_i(inode);
 739         u64 valid;
 740         loff_t pos;
 741
 742         if (is_resident(ni)) {
 743                 /* No readahead for resident. */
 744                 return;
 745         }
 746
 747         if (is_compressed(ni)) {
 748                 /* No readahead for compressed. */
 749                 return;
 750         }
 751
 752         valid = ni->i_valid;
 753         pos = readahead_pos(rac);
 754
 755         if (valid < i_size_read(inode) && pos <= valid &&
 756             valid < pos + readahead_length(rac)) {
 757                 /* Range cross 'valid'. Read it page by page. */
 758                 return;
 759         }
 760
 761         mpage_readahead(rac, ntfs_get_block);
 762 }
 763
 764 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
 765                                       struct buffer_head *bh_result, int create)
 766 {
 767         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 768                                   bh_result, create, GET_BLOCK_DIRECT_IO_R);
 769 }
 770
 771 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
 772                                       struct buffer_head *bh_result, int create)
 773 {
 774         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 775                                   bh_result, create, GET_BLOCK_DIRECT_IO_W);
 776 }
 777
 778 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 779 {
 780         struct file *file = iocb->ki_filp;
 781         struct address_space *mapping = file->f_mapping;
 782         struct inode *inode = mapping->host;
 783         struct ntfs_inode *ni = ntfs_i(inode);
 784         loff_t vbo = iocb->ki_pos;
 785         loff_t end;
 786         int wr = iov_iter_rw(iter) & WRITE;
 787         size_t iter_count = iov_iter_count(iter);
 788         loff_t valid;
 789         ssize_t ret;
 790
 791         if (is_resident(ni)) {
 792                 /* Switch to buffered write. */
 793                 ret = 0;
 794                 goto out;
 795         }
 796
 797         ret = blockdev_direct_IO(iocb, inode, iter,
 798                                  wr ? ntfs_get_block_direct_IO_W
 799                                     : ntfs_get_block_direct_IO_R);
 800
 801         if (ret > 0)
 802                 end = vbo + ret;
 803         else if (wr && ret == -EIOCBQUEUED)
 804                 end = vbo + iter_count;
 805         else
 806                 goto out;
 807
 808         valid = ni->i_valid;
 809         if (wr) {
 810                 if (end > valid && !S_ISBLK(inode->i_mode)) {
 811                         ni->i_valid = end;
 812                         mark_inode_dirty(inode);
 813                 }
 814         } else if (vbo < valid && valid < end) {
 815                 /* Fix page. */
 816                 iov_iter_revert(iter, end - valid);
 817                 iov_iter_zero(end - valid, iter);
 818         }
 819
 820 out:
 821         return ret;
 822 }
 823
 824 int ntfs_set_size(struct inode *inode, u64 new_size)
 825 {
 826         struct super_block *sb = inode->i_sb;
 827         struct ntfs_sb_info *sbi = sb->s_fs_info;
 828         struct ntfs_inode *ni = ntfs_i(inode);
 829         int err;
 830
 831         /* Check for maximum file size. */
 832         if (is_sparsed(ni) || is_compressed(ni)) {
 833                 if (new_size > sbi->maxbytes_sparse) {
 834                         err = -EFBIG;
 835                         goto out;
 836                 }
 837         } else if (new_size > sbi->maxbytes) {
 838                 err = -EFBIG;
 839                 goto out;
 840         }
 841
 842         ni_lock(ni);
 843         down_write(&ni->file.run_lock);
 844
 845         err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 846                             &ni->i_valid, true, NULL);
 847
 848         up_write(&ni->file.run_lock);
 849         ni_unlock(ni);
 850
 851         mark_inode_dirty(inode);
 852
 853 out:
 854         return err;
 855 }
 856
 857 static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
 858 {
 859         struct address_space *mapping = page->mapping;
 860         struct inode *inode = mapping->host;
 861         struct ntfs_inode *ni = ntfs_i(inode);
 862         int err;
 863
 864         if (is_resident(ni)) {
 865                 ni_lock(ni);
 866                 err = attr_data_write_resident(ni, page);
 867                 ni_unlock(ni);
 868                 if (err != E_NTFS_NONRESIDENT) {
 869                         unlock_page(page);
 870                         return err;
 871                 }
 872         }
 873
 874         return block_write_full_page(page, ntfs_get_block, wbc);
 875 }
 876
 877 static int ntfs_writepages(struct address_space *mapping,
 878                            struct writeback_control *wbc)
 879 {
 880         struct inode *inode = mapping->host;
 881         struct ntfs_inode *ni = ntfs_i(inode);
 882         /* Redirect call to 'ntfs_writepage' for resident files. */
 883         get_block_t *get_block = is_resident(ni) ? NULL : &ntfs_get_block;
 884
 885         return mpage_writepages(mapping, wbc, get_block);
 886 }
 887
 888 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
 889                                       struct buffer_head *bh_result, int create)
 890 {
 891         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 892                                   bh_result, create, GET_BLOCK_WRITE_BEGIN);
 893 }
 894
 895 static int ntfs_write_begin(struct file *file, struct address_space *mapping,
 896                             loff_t pos, u32 len, u32 flags, struct page **pagep,
 897                             void **fsdata)
 898 {
 899         int err;
 900         struct inode *inode = mapping->host;
 901         struct ntfs_inode *ni = ntfs_i(inode);
 902
 903         *pagep = NULL;
 904         if (is_resident(ni)) {
 905                 struct page *page = grab_cache_page_write_begin(
 906                         mapping, pos >> PAGE_SHIFT, flags);
 907
 908                 if (!page) {
 909                         err = -ENOMEM;
 910                         goto out;
 911                 }
 912
 913                 ni_lock(ni);
 914                 err = attr_data_read_resident(ni, page);
 915                 ni_unlock(ni);
 916
 917                 if (!err) {
 918                         *pagep = page;
 919                         goto out;
 920                 }
 921                 unlock_page(page);
 922                 put_page(page);
 923
 924                 if (err != E_NTFS_NONRESIDENT)
 925                         goto out;
 926         }
 927
 928         err = block_write_begin(mapping, pos, len, flags, pagep,
 929                                 ntfs_get_block_write_begin);
 930
 931 out:
 932         return err;
 933 }
 934
 935 /*
 936  * ntfs_write_end - Address_space_operations::write_end.
 937  */
 938 static int ntfs_write_end(struct file *file, struct address_space *mapping,
 939                           loff_t pos, u32 len, u32 copied, struct page *page,
 940                           void *fsdata)
 941
 942 {
 943         struct inode *inode = mapping->host;
 944         struct ntfs_inode *ni = ntfs_i(inode);
 945         u64 valid = ni->i_valid;
 946         bool dirty = false;
 947         int err;
 948
 949         if (is_resident(ni)) {
 950                 ni_lock(ni);
 951                 err = attr_data_write_resident(ni, page);
 952                 ni_unlock(ni);
 953                 if (!err) {
 954                         dirty = true;
 955                         /* Clear any buffers in page. */
 956                         if (page_has_buffers(page)) {
 957                                 struct buffer_head *head, *bh;
 958
 959                                 bh = head = page_buffers(page);
 960                                 do {
 961                                         clear_buffer_dirty(bh);
 962                                         clear_buffer_mapped(bh);
 963                                         set_buffer_uptodate(bh);
 964                                 } while (head != (bh = bh->b_this_page));
 965                         }
 966                         SetPageUptodate(page);
 967                         err = copied;
 968                 }
 969                 unlock_page(page);
 970                 put_page(page);
 971         } else {
 972                 err = generic_write_end(file, mapping, pos, len, copied, page,
 973                                         fsdata);
 974         }
 975
 976         if (err >= 0) {
 977                 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
 978                         inode->i_ctime = inode->i_mtime = current_time(inode);
 979                         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 980                         dirty = true;
 981                 }
 982
 983                 if (valid != ni->i_valid) {
 984                         /* ni->i_valid is changed in ntfs_get_block_vbo. */
 985                         dirty = true;
 986                 }
 987
 988                 if (dirty)
 989                         mark_inode_dirty(inode);
 990         }
 991
 992         return err;
 993 }
 994
 995 int reset_log_file(struct inode *inode)
 996 {
 997         int err;
 998         loff_t pos = 0;
 999         u32 log_size = inode->i_size;
1000         struct address_space *mapping = inode->i_mapping;
1001
1002         for (;;) {
1003                 u32 len;
1004                 void *kaddr;
1005                 struct page *page;
1006
1007                 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
1008
1009                 err = block_write_begin(mapping, pos, len, 0, &page,
1010                                         ntfs_get_block_write_begin);
1011                 if (err)
1012                         goto out;
1013
1014                 kaddr = kmap_atomic(page);
1015                 memset(kaddr, -1, len);
1016                 kunmap_atomic(kaddr);
1017                 flush_dcache_page(page);
1018
1019                 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
1020                 if (err < 0)
1021                         goto out;
1022                 pos += len;
1023
1024                 if (pos >= log_size)
1025                         break;
1026                 balance_dirty_pages_ratelimited(mapping);
1027         }
1028 out:
1029         mark_inode_dirty_sync(inode);
1030
1031         return err;
1032 }
1033
1034 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1035 {
1036         return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1037 }
1038
1039 int ntfs_sync_inode(struct inode *inode)
1040 {
1041         return _ni_write_inode(inode, 1);
1042 }
1043
1044 /*
1045  * writeback_inode - Helper function for ntfs_flush_inodes().
1046  *
1047  * This writes both the inode and the file data blocks, waiting
1048  * for in flight data blocks before the start of the call.  It
1049  * does not wait for any io started during the call.
1050  */
1051 static int writeback_inode(struct inode *inode)
1052 {
1053         int ret = sync_inode_metadata(inode, 0);
1054
1055         if (!ret)
1056                 ret = filemap_fdatawrite(inode->i_mapping);
1057         return ret;
1058 }
1059
1060 /*
1061  * ntfs_flush_inodes
1062  *
1063  * Write data and metadata corresponding to i1 and i2.  The io is
1064  * started but we do not wait for any of it to finish.
1065  *
1066  * filemap_flush() is used for the block device, so if there is a dirty
1067  * page for a block already in flight, we will not wait and start the
1068  * io over again.
1069  */
1070 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1071                       struct inode *i2)
1072 {
1073         int ret = 0;
1074
1075         if (i1)
1076                 ret = writeback_inode(i1);
1077         if (!ret && i2)
1078                 ret = writeback_inode(i2);
1079         if (!ret)
1080                 ret = filemap_flush(sb->s_bdev->bd_inode->i_mapping);
1081         return ret;
1082 }
1083
1084 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1085 {
1086         pgoff_t idx;
1087
1088         /* Write non resident data. */
1089         for (idx = 0; bytes; idx++) {
1090                 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1091                 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1092
1093                 if (IS_ERR(page))
1094                         return PTR_ERR(page);
1095
1096                 lock_page(page);
1097                 WARN_ON(!PageUptodate(page));
1098                 ClearPageUptodate(page);
1099
1100                 memcpy(page_address(page), data, op);
1101
1102                 flush_dcache_page(page);
1103                 SetPageUptodate(page);
1104                 unlock_page(page);
1105
1106                 ntfs_unmap_page(page);
1107
1108                 bytes -= op;
1109                 data = Add2Ptr(data, PAGE_SIZE);
1110         }
1111         return 0;
1112 }
1113
1114 /*
1115  * ntfs_reparse_bytes
1116  *
1117  * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1118  * for unicode string of @uni_len length.
1119  */
1120 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1121 {
1122         /* Header + unicode string + decorated unicode string. */
1123         return sizeof(short) * (2 * uni_len + 4) +
1124                offsetof(struct REPARSE_DATA_BUFFER,
1125                         SymbolicLinkReparseBuffer.PathBuffer);
1126 }
1127
1128 static struct REPARSE_DATA_BUFFER *
1129 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1130                            u32 size, u16 *nsize)
1131 {
1132         int i, err;
1133         struct REPARSE_DATA_BUFFER *rp;
1134         __le16 *rp_name;
1135         typeof(rp->SymbolicLinkReparseBuffer) *rs;
1136
1137         rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1138         if (!rp)
1139                 return ERR_PTR(-ENOMEM);
1140
1141         rs = &rp->SymbolicLinkReparseBuffer;
1142         rp_name = rs->PathBuffer;
1143
1144         /* Convert link name to UTF-16. */
1145         err = ntfs_nls_to_utf16(sbi, symname, size,
1146                                 (struct cpu_str *)(rp_name - 1), 2 * size,
1147                                 UTF16_LITTLE_ENDIAN);
1148         if (err < 0)
1149                 goto out;
1150
1151         /* err = the length of unicode name of symlink. */
1152         *nsize = ntfs_reparse_bytes(err);
1153
1154         if (*nsize > sbi->reparse.max_size) {
1155                 err = -EFBIG;
1156                 goto out;
1157         }
1158
1159         /* Translate Linux '/' into Windows '\'. */
1160         for (i = 0; i < err; i++) {
1161                 if (rp_name[i] == cpu_to_le16('/'))
1162                         rp_name[i] = cpu_to_le16('\\');
1163         }
1164
1165         rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1166         rp->ReparseDataLength =
1167                 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1168                                               SymbolicLinkReparseBuffer));
1169
1170         /* PrintName + SubstituteName. */
1171         rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1172         rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1173         rs->PrintNameLength = rs->SubstituteNameOffset;
1174
1175         /*
1176          * TODO: Use relative path if possible to allow Windows to
1177          * parse this path.
1178          * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1179          */
1180         rs->Flags = 0;
1181
1182         memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1183
1184         /* Decorate SubstituteName. */
1185         rp_name += err;
1186         rp_name[0] = cpu_to_le16('\\');
1187         rp_name[1] = cpu_to_le16('?');
1188         rp_name[2] = cpu_to_le16('?');
1189         rp_name[3] = cpu_to_le16('\\');
1190
1191         return rp;
1192 out:
1193         kfree(rp);
1194         return ERR_PTR(err);
1195 }
1196
1197 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
1198                                 struct inode *dir, struct dentry *dentry,
1199                                 const struct cpu_str *uni, umode_t mode,
1200                                 dev_t dev, const char *symname, u32 size,
1201                                 struct ntfs_fnd *fnd)
1202 {
1203         int err;
1204         struct super_block *sb = dir->i_sb;
1205         struct ntfs_sb_info *sbi = sb->s_fs_info;
1206         const struct qstr *name = &dentry->d_name;
1207         CLST ino = 0;
1208         struct ntfs_inode *dir_ni = ntfs_i(dir);
1209         struct ntfs_inode *ni = NULL;
1210         struct inode *inode = NULL;
1211         struct ATTRIB *attr;
1212         struct ATTR_STD_INFO5 *std5;
1213         struct ATTR_FILE_NAME *fname;
1214         struct MFT_REC *rec;
1215         u32 asize, dsize, sd_size;
1216         enum FILE_ATTRIBUTE fa;
1217         __le32 security_id = SECURITY_ID_INVALID;
1218         CLST vcn;
1219         const void *sd;
1220         u16 t16, nsize = 0, aid = 0;
1221         struct INDEX_ROOT *root, *dir_root;
1222         struct NTFS_DE *e, *new_de = NULL;
1223         struct REPARSE_DATA_BUFFER *rp = NULL;
1224         bool rp_inserted = false;
1225
1226         ni_lock_dir(dir_ni);
1227
1228         dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1229         if (!dir_root) {
1230                 err = -EINVAL;
1231                 goto out1;
1232         }
1233
1234         if (S_ISDIR(mode)) {
1235                 /* Use parent's directory attributes. */
1236                 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1237                      FILE_ATTRIBUTE_ARCHIVE;
1238                 /*
1239                  * By default child directory inherits parent attributes.
1240                  * Root directory is hidden + system.
1241                  * Make an exception for children in root.
1242                  */
1243                 if (dir->i_ino == MFT_REC_ROOT)
1244                         fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1245         } else if (S_ISLNK(mode)) {
1246                 /* It is good idea that link should be the same type (file/dir) as target */
1247                 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1248
1249                 /*
1250                  * Linux: there are dir/file/symlink and so on.
1251                  * NTFS: symlinks are "dir + reparse" or "file + reparse"
1252                  * It is good idea to create:
1253                  * dir + reparse if 'symname' points to directory
1254                  * or
1255                  * file + reparse if 'symname' points to file
1256                  * Unfortunately kern_path hangs if symname contains 'dir'.
1257                  */
1258
1259                 /*
1260                  *      struct path path;
1261                  *
1262                  *      if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1263                  *              struct inode *target = d_inode(path.dentry);
1264                  *
1265                  *              if (S_ISDIR(target->i_mode))
1266                  *                      fa |= FILE_ATTRIBUTE_DIRECTORY;
1267                  *              // if ( target->i_sb == sb ){
1268                  *              //      use relative path?
1269                  *              // }
1270                  *              path_put(&path);
1271                  *      }
1272                  */
1273         } else if (S_ISREG(mode)) {
1274                 if (sbi->options->sparse) {
1275                         /* Sparsed regular file, cause option 'sparse'. */
1276                         fa = FILE_ATTRIBUTE_SPARSE_FILE |
1277                              FILE_ATTRIBUTE_ARCHIVE;
1278                 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1279                         /* Compressed regular file, if parent is compressed. */
1280                         fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1281                 } else {
1282                         /* Regular file, default attributes. */
1283                         fa = FILE_ATTRIBUTE_ARCHIVE;
1284                 }
1285         } else {
1286                 fa = FILE_ATTRIBUTE_ARCHIVE;
1287         }
1288
1289         if (!(mode & 0222))
1290                 fa |= FILE_ATTRIBUTE_READONLY;
1291
1292         /* Allocate PATH_MAX bytes. */
1293         new_de = __getname();
1294         if (!new_de) {
1295                 err = -ENOMEM;
1296                 goto out1;
1297         }
1298
1299         /* Mark rw ntfs as dirty. it will be cleared at umount. */
1300         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1301
1302         /* Step 1: allocate and fill new mft record. */
1303         err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1304         if (err)
1305                 goto out2;
1306
1307         ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY);
1308         if (IS_ERR(ni)) {
1309                 err = PTR_ERR(ni);
1310                 ni = NULL;
1311                 goto out3;
1312         }
1313         inode = &ni->vfs_inode;
1314         inode_init_owner(mnt_userns, inode, dir, mode);
1315         mode = inode->i_mode;
1316
1317         inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
1318                 current_time(inode);
1319
1320         rec = ni->mi.mrec;
1321         rec->hard_links = cpu_to_le16(1);
1322         attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1323
1324         /* Get default security id. */
1325         sd = s_default_security;
1326         sd_size = sizeof(s_default_security);
1327
1328         if (is_ntfs3(sbi)) {
1329                 security_id = dir_ni->std_security_id;
1330                 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1331                         security_id = sbi->security.def_security_id;
1332
1333                         if (security_id == SECURITY_ID_INVALID &&
1334                             !ntfs_insert_security(sbi, sd, sd_size,
1335                                                   &security_id, NULL))
1336                                 sbi->security.def_security_id = security_id;
1337                 }
1338         }
1339
1340         /* Insert standard info. */
1341         std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1342
1343         if (security_id == SECURITY_ID_INVALID) {
1344                 dsize = sizeof(struct ATTR_STD_INFO);
1345         } else {
1346                 dsize = sizeof(struct ATTR_STD_INFO5);
1347                 std5->security_id = security_id;
1348                 ni->std_security_id = security_id;
1349         }
1350         asize = SIZEOF_RESIDENT + dsize;
1351
1352         attr->type = ATTR_STD;
1353         attr->size = cpu_to_le32(asize);
1354         attr->id = cpu_to_le16(aid++);
1355         attr->res.data_off = SIZEOF_RESIDENT_LE;
1356         attr->res.data_size = cpu_to_le32(dsize);
1357
1358         std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1359                 kernel2nt(&inode->i_atime);
1360
1361         ni->std_fa = fa;
1362         std5->fa = fa;
1363
1364         attr = Add2Ptr(attr, asize);
1365
1366         /* Insert file name. */
1367         err = fill_name_de(sbi, new_de, name, uni);
1368         if (err)
1369                 goto out4;
1370
1371         mi_get_ref(&ni->mi, &new_de->ref);
1372
1373         fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1374         mi_get_ref(&dir_ni->mi, &fname->home);
1375         fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1376                 fname->dup.a_time = std5->cr_time;
1377         fname->dup.alloc_size = fname->dup.data_size = 0;
1378         fname->dup.fa = std5->fa;
1379         fname->dup.ea_size = fname->dup.reparse = 0;
1380
1381         dsize = le16_to_cpu(new_de->key_size);
1382         asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1383
1384         attr->type = ATTR_NAME;
1385         attr->size = cpu_to_le32(asize);
1386         attr->res.data_off = SIZEOF_RESIDENT_LE;
1387         attr->res.flags = RESIDENT_FLAG_INDEXED;
1388         attr->id = cpu_to_le16(aid++);
1389         attr->res.data_size = cpu_to_le32(dsize);
1390         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1391
1392         attr = Add2Ptr(attr, asize);
1393
1394         if (security_id == SECURITY_ID_INVALID) {
1395                 /* Insert security attribute. */
1396                 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1397
1398                 attr->type = ATTR_SECURE;
1399                 attr->size = cpu_to_le32(asize);
1400                 attr->id = cpu_to_le16(aid++);
1401                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1402                 attr->res.data_size = cpu_to_le32(sd_size);
1403                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1404
1405                 attr = Add2Ptr(attr, asize);
1406         }
1407
1408         attr->id = cpu_to_le16(aid++);
1409         if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1410                 /*
1411                  * Regular directory or symlink to directory.
1412                  * Create root attribute.
1413                  */
1414                 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1415                 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1416
1417                 attr->type = ATTR_ROOT;
1418                 attr->size = cpu_to_le32(asize);
1419
1420                 attr->name_len = ARRAY_SIZE(I30_NAME);
1421                 attr->name_off = SIZEOF_RESIDENT_LE;
1422                 attr->res.data_off =
1423                         cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1424                 attr->res.data_size = cpu_to_le32(dsize);
1425                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1426                        sizeof(I30_NAME));
1427
1428                 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1429                 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1430                 root->ihdr.de_off =
1431                         cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10
1432                 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1433                                               sizeof(struct NTFS_DE));
1434                 root->ihdr.total = root->ihdr.used;
1435
1436                 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1437                 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1438                 e->flags = NTFS_IE_LAST;
1439         } else if (S_ISLNK(mode)) {
1440                 /*
1441                  * Symlink to file.
1442                  * Create empty resident data attribute.
1443                  */
1444                 asize = SIZEOF_RESIDENT;
1445
1446                 /* Insert empty ATTR_DATA */
1447                 attr->type = ATTR_DATA;
1448                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1449                 attr->name_off = SIZEOF_RESIDENT_LE;
1450                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1451         } else if (S_ISREG(mode)) {
1452                 /*
1453                  * Regular file. Create empty non resident data attribute.
1454                  */
1455                 attr->type = ATTR_DATA;
1456                 attr->non_res = 1;
1457                 attr->nres.evcn = cpu_to_le64(-1ll);
1458                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1459                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1460                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1461                         attr->flags = ATTR_FLAG_SPARSED;
1462                         asize = SIZEOF_NONRESIDENT_EX + 8;
1463                 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1464                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1465                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1466                         attr->flags = ATTR_FLAG_COMPRESSED;
1467                         attr->nres.c_unit = COMPRESSION_UNIT;
1468                         asize = SIZEOF_NONRESIDENT_EX + 8;
1469                 } else {
1470                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1471                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1472                         asize = SIZEOF_NONRESIDENT + 8;
1473                 }
1474                 attr->nres.run_off = attr->name_off;
1475         } else {
1476                 /*
1477                  * Node. Create empty resident data attribute.
1478                  */
1479                 attr->type = ATTR_DATA;
1480                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1481                 attr->name_off = SIZEOF_RESIDENT_LE;
1482                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1483                         attr->flags = ATTR_FLAG_SPARSED;
1484                 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1485                         attr->flags = ATTR_FLAG_COMPRESSED;
1486                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1487                 asize = SIZEOF_RESIDENT;
1488                 ni->ni_flags |= NI_FLAG_RESIDENT;
1489         }
1490
1491         if (S_ISDIR(mode)) {
1492                 ni->ni_flags |= NI_FLAG_DIR;
1493                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1494                 if (err)
1495                         goto out4;
1496         } else if (S_ISLNK(mode)) {
1497                 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1498
1499                 if (IS_ERR(rp)) {
1500                         err = PTR_ERR(rp);
1501                         rp = NULL;
1502                         goto out4;
1503                 }
1504
1505                 /*
1506                  * Insert ATTR_REPARSE.
1507                  */
1508                 attr = Add2Ptr(attr, asize);
1509                 attr->type = ATTR_REPARSE;
1510                 attr->id = cpu_to_le16(aid++);
1511
1512                 /* Resident or non resident? */
1513                 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1514                 t16 = PtrOffset(rec, attr);
1515
1516                 /*
1517                  * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1518                  * It is good idea to keep extened attributes resident.
1519                  */
1520                 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1521                         CLST alen;
1522                         CLST clst = bytes_to_cluster(sbi, nsize);
1523
1524                         /* Bytes per runs. */
1525                         t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1526
1527                         attr->non_res = 1;
1528                         attr->nres.evcn = cpu_to_le64(clst - 1);
1529                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1530                         attr->nres.run_off = attr->name_off;
1531                         attr->nres.data_size = cpu_to_le64(nsize);
1532                         attr->nres.valid_size = attr->nres.data_size;
1533                         attr->nres.alloc_size =
1534                                 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1535
1536                         err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1537                                                      clst, NULL, 0, &alen, 0,
1538                                                      NULL);
1539                         if (err)
1540                                 goto out5;
1541
1542                         err = run_pack(&ni->file.run, 0, clst,
1543                                        Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1544                                        &vcn);
1545                         if (err < 0)
1546                                 goto out5;
1547
1548                         if (vcn != clst) {
1549                                 err = -EINVAL;
1550                                 goto out5;
1551                         }
1552
1553                         asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1554                 } else {
1555                         attr->res.data_off = SIZEOF_RESIDENT_LE;
1556                         attr->res.data_size = cpu_to_le32(nsize);
1557                         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1558                         nsize = 0;
1559                 }
1560                 /* Size of symlink equals the length of input string. */
1561                 inode->i_size = size;
1562
1563                 attr->size = cpu_to_le32(asize);
1564
1565                 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1566                                           &new_de->ref);
1567                 if (err)
1568                         goto out5;
1569
1570                 rp_inserted = true;
1571         }
1572
1573         attr = Add2Ptr(attr, asize);
1574         attr->type = ATTR_END;
1575
1576         rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1577         rec->next_attr_id = cpu_to_le16(aid);
1578
1579         /* Step 2: Add new name in index. */
1580         err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1581         if (err)
1582                 goto out6;
1583
1584         /* Unlock parent directory before ntfs_init_acl. */
1585         ni_unlock(dir_ni);
1586
1587         inode->i_generation = le16_to_cpu(rec->seq);
1588
1589         dir->i_mtime = dir->i_ctime = inode->i_atime;
1590
1591         if (S_ISDIR(mode)) {
1592                 inode->i_op = &ntfs_dir_inode_operations;
1593                 inode->i_fop = &ntfs_dir_operations;
1594         } else if (S_ISLNK(mode)) {
1595                 inode->i_op = &ntfs_link_inode_operations;
1596                 inode->i_fop = NULL;
1597                 inode->i_mapping->a_ops = &ntfs_aops;
1598                 inode->i_size = size;
1599                 inode_nohighmem(inode);
1600         } else if (S_ISREG(mode)) {
1601                 inode->i_op = &ntfs_file_inode_operations;
1602                 inode->i_fop = &ntfs_file_operations;
1603                 inode->i_mapping->a_ops =
1604                         is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
1605                 init_rwsem(&ni->file.run_lock);
1606         } else {
1607                 inode->i_op = &ntfs_special_inode_operations;
1608                 init_special_inode(inode, mode, dev);
1609         }
1610
1611 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1612         if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1613                 err = ntfs_init_acl(mnt_userns, inode, dir);
1614                 if (err)
1615                         goto out7;
1616         } else
1617 #endif
1618         {
1619                 inode->i_flags |= S_NOSEC;
1620         }
1621
1622         /* Write non resident data. */
1623         if (nsize) {
1624                 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0);
1625                 if (err)
1626                         goto out7;
1627         }
1628
1629         /*
1630          * Call 'd_instantiate' after inode->i_op is set
1631          * but before finish_open.
1632          */
1633         d_instantiate(dentry, inode);
1634
1635         ntfs_save_wsl_perm(inode);
1636         mark_inode_dirty(dir);
1637         mark_inode_dirty(inode);
1638
1639         /* Normal exit. */
1640         goto out2;
1641
1642 out7:
1643
1644         /* Undo 'indx_insert_entry'. */
1645         ni_lock_dir(dir_ni);
1646         indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
1647                           le16_to_cpu(new_de->key_size), sbi);
1648         /* ni_unlock(dir_ni); will be called later. */
1649 out6:
1650         if (rp_inserted)
1651                 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1652
1653 out5:
1654         if (!S_ISDIR(mode))
1655                 run_deallocate(sbi, &ni->file.run, false);
1656
1657 out4:
1658         clear_rec_inuse(rec);
1659         clear_nlink(inode);
1660         ni->mi.dirty = false;
1661         discard_new_inode(inode);
1662 out3:
1663         ntfs_mark_rec_free(sbi, ino);
1664
1665 out2:
1666         __putname(new_de);
1667         kfree(rp);
1668
1669 out1:
1670         if (err) {
1671                 ni_unlock(dir_ni);
1672                 return ERR_PTR(err);
1673         }
1674
1675         unlock_new_inode(inode);
1676
1677         return inode;
1678 }
1679
1680 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1681 {
1682         int err;
1683         struct ntfs_inode *ni = ntfs_i(inode);
1684         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1685         struct NTFS_DE *de;
1686         struct ATTR_FILE_NAME *de_name;
1687
1688         /* Allocate PATH_MAX bytes. */
1689         de = __getname();
1690         if (!de)
1691                 return -ENOMEM;
1692
1693         /* Mark rw ntfs as dirty. It will be cleared at umount. */
1694         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1695
1696         /* Construct 'de'. */
1697         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1698         if (err)
1699                 goto out;
1700
1701         de_name = (struct ATTR_FILE_NAME *)(de + 1);
1702         /* Fill duplicate info. */
1703         de_name->dup.cr_time = de_name->dup.m_time = de_name->dup.c_time =
1704                 de_name->dup.a_time = kernel2nt(&inode->i_ctime);
1705         de_name->dup.alloc_size = de_name->dup.data_size =
1706                 cpu_to_le64(inode->i_size);
1707         de_name->dup.fa = ni->std_fa;
1708         de_name->dup.ea_size = de_name->dup.reparse = 0;
1709
1710         err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1711 out:
1712         __putname(de);
1713         return err;
1714 }
1715
1716 /*
1717  * ntfs_unlink_inode
1718  *
1719  * inode_operations::unlink
1720  * inode_operations::rmdir
1721  */
1722 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1723 {
1724         int err;
1725         struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1726         struct inode *inode = d_inode(dentry);
1727         struct ntfs_inode *ni = ntfs_i(inode);
1728         struct ntfs_inode *dir_ni = ntfs_i(dir);
1729         struct NTFS_DE *de, *de2 = NULL;
1730         int undo_remove;
1731
1732         if (ntfs_is_meta_file(sbi, ni->mi.rno))
1733                 return -EINVAL;
1734
1735         /* Allocate PATH_MAX bytes. */
1736         de = __getname();
1737         if (!de)
1738                 return -ENOMEM;
1739
1740         ni_lock(ni);
1741
1742         if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1743                 err = -ENOTEMPTY;
1744                 goto out;
1745         }
1746
1747         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1748         if (err < 0)
1749                 goto out;
1750
1751         undo_remove = 0;
1752         err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1753
1754         if (!err) {
1755                 drop_nlink(inode);
1756                 dir->i_mtime = dir->i_ctime = current_time(dir);
1757                 mark_inode_dirty(dir);
1758                 inode->i_ctime = dir->i_ctime;
1759                 if (inode->i_nlink)
1760                         mark_inode_dirty(inode);
1761         } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1762                 make_bad_inode(inode);
1763                 ntfs_inode_err(inode, "failed to undo unlink");
1764                 ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
1765         } else {
1766                 if (ni_is_dirty(dir))
1767                         mark_inode_dirty(dir);
1768                 if (ni_is_dirty(inode))
1769                         mark_inode_dirty(inode);
1770         }
1771
1772 out:
1773         ni_unlock(ni);
1774         __putname(de);
1775         return err;
1776 }
1777
1778 void ntfs_evict_inode(struct inode *inode)
1779 {
1780         truncate_inode_pages_final(&inode->i_data);
1781
1782         if (inode->i_nlink)
1783                 _ni_write_inode(inode, inode_needs_sync(inode));
1784
1785         invalidate_inode_buffers(inode);
1786         clear_inode(inode);
1787
1788         ni_clear(ntfs_i(inode));
1789 }
1790
1791 static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer,
1792                                       int buflen)
1793 {
1794         int i, err = -EINVAL;
1795         struct ntfs_inode *ni = ntfs_i(inode);
1796         struct super_block *sb = inode->i_sb;
1797         struct ntfs_sb_info *sbi = sb->s_fs_info;
1798         u64 size;
1799         u16 ulen = 0;
1800         void *to_free = NULL;
1801         struct REPARSE_DATA_BUFFER *rp;
1802         const __le16 *uname;
1803         struct ATTRIB *attr;
1804
1805         /* Reparse data present. Try to parse it. */
1806         static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1807         static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1808
1809         *buffer = 0;
1810
1811         attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1812         if (!attr)
1813                 goto out;
1814
1815         if (!attr->non_res) {
1816                 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1817                 if (!rp)
1818                         goto out;
1819                 size = le32_to_cpu(attr->res.data_size);
1820         } else {
1821                 size = le64_to_cpu(attr->nres.data_size);
1822                 rp = NULL;
1823         }
1824
1825         if (size > sbi->reparse.max_size || size <= sizeof(u32))
1826                 goto out;
1827
1828         if (!rp) {
1829                 rp = kmalloc(size, GFP_NOFS);
1830                 if (!rp) {
1831                         err = -ENOMEM;
1832                         goto out;
1833                 }
1834                 to_free = rp;
1835                 /* Read into temporal buffer. */
1836                 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1837                 if (err)
1838                         goto out;
1839         }
1840
1841         /* Microsoft Tag. */
1842         switch (rp->ReparseTag) {
1843         case IO_REPARSE_TAG_MOUNT_POINT:
1844                 /* Mount points and junctions. */
1845                 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1846                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1847                                      MountPointReparseBuffer.PathBuffer))
1848                         goto out;
1849                 uname = Add2Ptr(rp,
1850                                 offsetof(struct REPARSE_DATA_BUFFER,
1851                                          MountPointReparseBuffer.PathBuffer) +
1852                                         le16_to_cpu(rp->MountPointReparseBuffer
1853                                                             .PrintNameOffset));
1854                 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1855                 break;
1856
1857         case IO_REPARSE_TAG_SYMLINK:
1858                 /* FolderSymbolicLink */
1859                 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1860                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1861                                      SymbolicLinkReparseBuffer.PathBuffer))
1862                         goto out;
1863                 uname = Add2Ptr(
1864                         rp, offsetof(struct REPARSE_DATA_BUFFER,
1865                                      SymbolicLinkReparseBuffer.PathBuffer) +
1866                                     le16_to_cpu(rp->SymbolicLinkReparseBuffer
1867                                                         .PrintNameOffset));
1868                 ulen = le16_to_cpu(
1869                         rp->SymbolicLinkReparseBuffer.PrintNameLength);
1870                 break;
1871
1872         case IO_REPARSE_TAG_CLOUD:
1873         case IO_REPARSE_TAG_CLOUD_1:
1874         case IO_REPARSE_TAG_CLOUD_2:
1875         case IO_REPARSE_TAG_CLOUD_3:
1876         case IO_REPARSE_TAG_CLOUD_4:
1877         case IO_REPARSE_TAG_CLOUD_5:
1878         case IO_REPARSE_TAG_CLOUD_6:
1879         case IO_REPARSE_TAG_CLOUD_7:
1880         case IO_REPARSE_TAG_CLOUD_8:
1881         case IO_REPARSE_TAG_CLOUD_9:
1882         case IO_REPARSE_TAG_CLOUD_A:
1883         case IO_REPARSE_TAG_CLOUD_B:
1884         case IO_REPARSE_TAG_CLOUD_C:
1885         case IO_REPARSE_TAG_CLOUD_D:
1886         case IO_REPARSE_TAG_CLOUD_E:
1887         case IO_REPARSE_TAG_CLOUD_F:
1888                 err = sizeof("OneDrive") - 1;
1889                 if (err > buflen)
1890                         err = buflen;
1891                 memcpy(buffer, "OneDrive", err);
1892                 goto out;
1893
1894         default:
1895                 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
1896                         /* Unknown Microsoft Tag. */
1897                         goto out;
1898                 }
1899                 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
1900                     size <= sizeof(struct REPARSE_POINT)) {
1901                         goto out;
1902                 }
1903
1904                 /* Users tag. */
1905                 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
1906                 ulen = le16_to_cpu(rp->ReparseDataLength) -
1907                        sizeof(struct REPARSE_POINT);
1908         }
1909
1910         /* Convert nlen from bytes to UNICODE chars. */
1911         ulen >>= 1;
1912
1913         /* Check that name is available. */
1914         if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
1915                 goto out;
1916
1917         /* If name is already zero terminated then truncate it now. */
1918         if (!uname[ulen - 1])
1919                 ulen -= 1;
1920
1921         err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
1922
1923         if (err < 0)
1924                 goto out;
1925
1926         /* Translate Windows '\' into Linux '/'. */
1927         for (i = 0; i < err; i++) {
1928                 if (buffer[i] == '\\')
1929                         buffer[i] = '/';
1930         }
1931
1932         /* Always set last zero. */
1933         buffer[err] = 0;
1934 out:
1935         kfree(to_free);
1936         return err;
1937 }
1938
1939 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
1940                                  struct delayed_call *done)
1941 {
1942         int err;
1943         char *ret;
1944
1945         if (!de)
1946                 return ERR_PTR(-ECHILD);
1947
1948         ret = kmalloc(PAGE_SIZE, GFP_NOFS);
1949         if (!ret)
1950                 return ERR_PTR(-ENOMEM);
1951
1952         err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE);
1953         if (err < 0) {
1954                 kfree(ret);
1955                 return ERR_PTR(err);
1956         }
1957
1958         set_delayed_call(done, kfree_link, ret);
1959
1960         return ret;
1961 }
1962
1963 // clang-format off
1964 const struct inode_operations ntfs_link_inode_operations = {
1965         .get_link       = ntfs_get_link,
1966         .setattr        = ntfs3_setattr,
1967         .listxattr      = ntfs_listxattr,
1968         .permission     = ntfs_permission,
1969 };
1970
1971 const struct address_space_operations ntfs_aops = {
1972         .readpage       = ntfs_readpage,
1973         .readahead      = ntfs_readahead,
1974         .writepage      = ntfs_writepage,
1975         .writepages     = ntfs_writepages,
1976         .write_begin    = ntfs_write_begin,
1977         .write_end      = ntfs_write_end,
1978         .direct_IO      = ntfs_direct_IO,
1979         .bmap           = ntfs_bmap,
1980         .set_page_dirty = __set_page_dirty_buffers,
1981 };
1982
1983 const struct address_space_operations ntfs_aops_cmpr = {
1984         .readpage       = ntfs_readpage,
1985         .readahead      = ntfs_readahead,
1986 };
1987 // clang-format on