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         inode->i_generation = le16_to_cpu(rec->seq);
 104
 105         /* Enumerate all struct Attributes MFT. */
 106         le = NULL;
 107         attr = NULL;
 108
 109         /*
 110          * To reduce tab pressure use goto instead of
 111          * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
 112          */
 113 next_attr:
 114         run = NULL;
 115         err = -EINVAL;
 116         attr = ni_enum_attr_ex(ni, attr, &le, NULL);
 117         if (!attr)
 118                 goto end_enum;
 119
 120         if (le && le->vcn) {
 121                 /* This is non primary attribute segment. Ignore if not MFT. */
 122                 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
 123                         goto next_attr;
 124
 125                 run = &ni->file.run;
 126                 asize = le32_to_cpu(attr->size);
 127                 goto attr_unpack_run;
 128         }
 129
 130         roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
 131         rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
 132         asize = le32_to_cpu(attr->size);
 133
 134         if (le16_to_cpu(attr->name_off) + attr->name_len > asize)
 135                 goto out;
 136
 137         if (attr->non_res) {
 138                 t64 = le64_to_cpu(attr->nres.alloc_size);
 139                 if (le64_to_cpu(attr->nres.data_size) > t64 ||
 140                     le64_to_cpu(attr->nres.valid_size) > t64)
 141                         goto out;
 142         }
 143
 144         switch (attr->type) {
 145         case ATTR_STD:
 146                 if (attr->non_res ||
 147                     asize < sizeof(struct ATTR_STD_INFO) + roff ||
 148                     rsize < sizeof(struct ATTR_STD_INFO))
 149                         goto out;
 150
 151                 if (std5)
 152                         goto next_attr;
 153
 154                 std5 = Add2Ptr(attr, roff);
 155
 156 #ifdef STATX_BTIME
 157                 nt2kernel(std5->cr_time, &ni->i_crtime);
 158 #endif
 159                 nt2kernel(std5->a_time, &inode->i_atime);
 160                 nt2kernel(std5->c_time, &inode->i_ctime);
 161                 nt2kernel(std5->m_time, &inode->i_mtime);
 162
 163                 ni->std_fa = std5->fa;
 164
 165                 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
 166                     rsize >= sizeof(struct ATTR_STD_INFO5))
 167                         ni->std_security_id = std5->security_id;
 168                 goto next_attr;
 169
 170         case ATTR_LIST:
 171                 if (attr->name_len || le || ino == MFT_REC_LOG)
 172                         goto out;
 173
 174                 err = ntfs_load_attr_list(ni, attr);
 175                 if (err)
 176                         goto out;
 177
 178                 le = NULL;
 179                 attr = NULL;
 180                 goto next_attr;
 181
 182         case ATTR_NAME:
 183                 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
 184                     rsize < SIZEOF_ATTRIBUTE_FILENAME)
 185                         goto out;
 186
 187                 fname = Add2Ptr(attr, roff);
 188                 if (fname->type == FILE_NAME_DOS)
 189                         goto next_attr;
 190
 191                 names += 1;
 192                 if (name && name->len == fname->name_len &&
 193                     !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
 194                                         NULL, false))
 195                         is_match = true;
 196
 197                 goto next_attr;
 198
 199         case ATTR_DATA:
 200                 if (is_dir) {
 201                         /* Ignore data attribute in dir record. */
 202                         goto next_attr;
 203                 }
 204
 205                 if (ino == MFT_REC_BADCLUST && !attr->non_res)
 206                         goto next_attr;
 207
 208                 if (attr->name_len &&
 209                     ((ino != MFT_REC_BADCLUST || !attr->non_res ||
 210                       attr->name_len != ARRAY_SIZE(BAD_NAME) ||
 211                       memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
 212                      (ino != MFT_REC_SECURE || !attr->non_res ||
 213                       attr->name_len != ARRAY_SIZE(SDS_NAME) ||
 214                       memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
 215                         /* File contains stream attribute. Ignore it. */
 216                         goto next_attr;
 217                 }
 218
 219                 if (is_attr_sparsed(attr))
 220                         ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
 221                 else
 222                         ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
 223
 224                 if (is_attr_compressed(attr))
 225                         ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
 226                 else
 227                         ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
 228
 229                 if (is_attr_encrypted(attr))
 230                         ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
 231                 else
 232                         ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
 233
 234                 if (!attr->non_res) {
 235                         ni->i_valid = inode->i_size = rsize;
 236                         inode_set_bytes(inode, rsize);
 237                 }
 238
 239                 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
 240
 241                 if (!attr->non_res) {
 242                         ni->ni_flags |= NI_FLAG_RESIDENT;
 243                         goto next_attr;
 244                 }
 245
 246                 inode_set_bytes(inode, attr_ondisk_size(attr));
 247
 248                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 249                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 250                 if (!attr->nres.alloc_size)
 251                         goto next_attr;
 252
 253                 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run
 254                                             : &ni->file.run;
 255                 break;
 256
 257         case ATTR_ROOT:
 258                 if (attr->non_res)
 259                         goto out;
 260
 261                 root = Add2Ptr(attr, roff);
 262                 is_root = true;
 263
 264                 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
 265                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 266                         goto next_attr;
 267
 268                 if (root->type != ATTR_NAME ||
 269                     root->rule != NTFS_COLLATION_TYPE_FILENAME)
 270                         goto out;
 271
 272                 if (!is_dir)
 273                         goto next_attr;
 274
 275                 ni->ni_flags |= NI_FLAG_DIR;
 276
 277                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
 278                 if (err)
 279                         goto out;
 280
 281                 mode = sb->s_root
 282                                ? (S_IFDIR | (0777 & sbi->options->fs_dmask_inv))
 283                                : (S_IFDIR | 0777);
 284                 goto next_attr;
 285
 286         case ATTR_ALLOC:
 287                 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
 288                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 289                         goto next_attr;
 290
 291                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 292                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 293                 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
 294
 295                 run = &ni->dir.alloc_run;
 296                 break;
 297
 298         case ATTR_BITMAP:
 299                 if (ino == MFT_REC_MFT) {
 300                         if (!attr->non_res)
 301                                 goto out;
 302 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
 303                         /* 0x20000000 = 2^32 / 8 */
 304                         if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
 305                                 goto out;
 306 #endif
 307                         run = &sbi->mft.bitmap.run;
 308                         break;
 309                 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
 310                            !memcmp(attr_name(attr), I30_NAME,
 311                                    sizeof(I30_NAME)) &&
 312                            attr->non_res) {
 313                         run = &ni->dir.bitmap_run;
 314                         break;
 315                 }
 316                 goto next_attr;
 317
 318         case ATTR_REPARSE:
 319                 if (attr->name_len)
 320                         goto next_attr;
 321
 322                 rp_fa = ni_parse_reparse(ni, attr, &rp);
 323                 switch (rp_fa) {
 324                 case REPARSE_LINK:
 325                         /*
 326                          * Normal symlink.
 327                          * Assume one unicode symbol == one utf8.
 328                          */
 329                         inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
 330                                                             .PrintNameLength) /
 331                                         sizeof(u16);
 332
 333                         ni->i_valid = inode->i_size;
 334
 335                         /* Clear directory bit. */
 336                         if (ni->ni_flags & NI_FLAG_DIR) {
 337                                 indx_clear(&ni->dir);
 338                                 memset(&ni->dir, 0, sizeof(ni->dir));
 339                                 ni->ni_flags &= ~NI_FLAG_DIR;
 340                         } else {
 341                                 run_close(&ni->file.run);
 342                         }
 343                         mode = S_IFLNK | 0777;
 344                         is_dir = false;
 345                         if (attr->non_res) {
 346                                 run = &ni->file.run;
 347                                 goto attr_unpack_run; // Double break.
 348                         }
 349                         break;
 350
 351                 case REPARSE_COMPRESSED:
 352                         break;
 353
 354                 case REPARSE_DEDUPLICATED:
 355                         break;
 356                 }
 357                 goto next_attr;
 358
 359         case ATTR_EA_INFO:
 360                 if (!attr->name_len &&
 361                     resident_data_ex(attr, sizeof(struct EA_INFO))) {
 362                         ni->ni_flags |= NI_FLAG_EA;
 363                         /*
 364                          * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
 365                          */
 366                         inode->i_mode = mode;
 367                         ntfs_get_wsl_perm(inode);
 368                         mode = inode->i_mode;
 369                 }
 370                 goto next_attr;
 371
 372         default:
 373                 goto next_attr;
 374         }
 375
 376 attr_unpack_run:
 377         roff = le16_to_cpu(attr->nres.run_off);
 378
 379         if (roff > asize) {
 380                 err = -EINVAL;
 381                 goto out;
 382         }
 383
 384         t64 = le64_to_cpu(attr->nres.svcn);
 385
 386         err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
 387                             t64, Add2Ptr(attr, roff), asize - roff);
 388         if (err < 0)
 389                 goto out;
 390         err = 0;
 391         goto next_attr;
 392
 393 end_enum:
 394
 395         if (!std5)
 396                 goto out;
 397
 398         if (!is_match && name) {
 399                 /* Reuse rec as buffer for ascii name. */
 400                 err = -ENOENT;
 401                 goto out;
 402         }
 403
 404         if (std5->fa & FILE_ATTRIBUTE_READONLY)
 405                 mode &= ~0222;
 406
 407         if (!names) {
 408                 err = -EINVAL;
 409                 goto out;
 410         }
 411
 412         if (names != le16_to_cpu(rec->hard_links)) {
 413                 /* Correct minor error on the fly. Do not mark inode as dirty. */
 414                 rec->hard_links = cpu_to_le16(names);
 415                 ni->mi.dirty = true;
 416         }
 417
 418         set_nlink(inode, names);
 419
 420         if (S_ISDIR(mode)) {
 421                 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
 422
 423                 /*
 424                  * Dot and dot-dot should be included in count but was not
 425                  * included in enumeration.
 426                  * Usually a hard links to directories are disabled.
 427                  */
 428                 inode->i_op = &ntfs_dir_inode_operations;
 429                 inode->i_fop = &ntfs_dir_operations;
 430                 ni->i_valid = 0;
 431         } else if (S_ISLNK(mode)) {
 432                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 433                 inode->i_op = &ntfs_link_inode_operations;
 434                 inode->i_fop = NULL;
 435                 inode_nohighmem(inode);
 436         } else if (S_ISREG(mode)) {
 437                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 438                 inode->i_op = &ntfs_file_inode_operations;
 439                 inode->i_fop = &ntfs_file_operations;
 440                 inode->i_mapping->a_ops =
 441                         is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
 442                 if (ino != MFT_REC_MFT)
 443                         init_rwsem(&ni->file.run_lock);
 444         } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
 445                    S_ISSOCK(mode)) {
 446                 inode->i_op = &ntfs_special_inode_operations;
 447                 init_special_inode(inode, mode, inode->i_rdev);
 448         } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
 449                    fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
 450                 /* Records in $Extend are not a files or general directories. */
 451                 inode->i_op = &ntfs_file_inode_operations;
 452         } else {
 453                 err = -EINVAL;
 454                 goto out;
 455         }
 456
 457         if ((sbi->options->sys_immutable &&
 458              (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
 459             !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
 460                 inode->i_flags |= S_IMMUTABLE;
 461         } else {
 462                 inode->i_flags &= ~S_IMMUTABLE;
 463         }
 464
 465         inode->i_mode = mode;
 466         if (!(ni->ni_flags & NI_FLAG_EA)) {
 467                 /* If no xattr then no security (stored in xattr). */
 468                 inode->i_flags |= S_NOSEC;
 469         }
 470
 471         if (ino == MFT_REC_MFT && !sb->s_root)
 472                 sbi->mft.ni = NULL;
 473
 474         unlock_new_inode(inode);
 475
 476         return inode;
 477
 478 out:
 479         if (ino == MFT_REC_MFT && !sb->s_root)
 480                 sbi->mft.ni = NULL;
 481
 482         iget_failed(inode);
 483         return ERR_PTR(err);
 484 }
 485
 486 /*
 487  * ntfs_test_inode
 488  *
 489  * Return: 1 if match.
 490  */
 491 static int ntfs_test_inode(struct inode *inode, void *data)
 492 {
 493         struct MFT_REF *ref = data;
 494
 495         return ino_get(ref) == inode->i_ino;
 496 }
 497
 498 static int ntfs_set_inode(struct inode *inode, void *data)
 499 {
 500         const struct MFT_REF *ref = data;
 501
 502         inode->i_ino = ino_get(ref);
 503         return 0;
 504 }
 505
 506 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
 507                          const struct cpu_str *name)
 508 {
 509         struct inode *inode;
 510
 511         inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
 512                              (void *)ref);
 513         if (unlikely(!inode))
 514                 return ERR_PTR(-ENOMEM);
 515
 516         /* If this is a freshly allocated inode, need to read it now. */
 517         if (inode->i_state & I_NEW)
 518                 inode = ntfs_read_mft(inode, name, ref);
 519         else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
 520                 /* Inode overlaps? */
 521                 _ntfs_bad_inode(inode);
 522         }
 523
 524         if (IS_ERR(inode) && name)
 525                 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
 526
 527         return inode;
 528 }
 529
 530 enum get_block_ctx {
 531         GET_BLOCK_GENERAL = 0,
 532         GET_BLOCK_WRITE_BEGIN = 1,
 533         GET_BLOCK_DIRECT_IO_R = 2,
 534         GET_BLOCK_DIRECT_IO_W = 3,
 535         GET_BLOCK_BMAP = 4,
 536 };
 537
 538 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
 539                                        struct buffer_head *bh, int create,
 540                                        enum get_block_ctx ctx)
 541 {
 542         struct super_block *sb = inode->i_sb;
 543         struct ntfs_sb_info *sbi = sb->s_fs_info;
 544         struct ntfs_inode *ni = ntfs_i(inode);
 545         struct page *page = bh->b_page;
 546         u8 cluster_bits = sbi->cluster_bits;
 547         u32 block_size = sb->s_blocksize;
 548         u64 bytes, lbo, valid;
 549         u32 off;
 550         int err;
 551         CLST vcn, lcn, len;
 552         bool new;
 553
 554         /* Clear previous state. */
 555         clear_buffer_new(bh);
 556         clear_buffer_uptodate(bh);
 557
 558         if (is_resident(ni)) {
 559                 ni_lock(ni);
 560                 err = attr_data_read_resident(ni, page);
 561                 ni_unlock(ni);
 562
 563                 if (!err)
 564                         set_buffer_uptodate(bh);
 565                 bh->b_size = block_size;
 566                 return err;
 567         }
 568
 569         vcn = vbo >> cluster_bits;
 570         off = vbo & sbi->cluster_mask;
 571         new = false;
 572
 573         err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
 574                                   create && sbi->cluster_size > PAGE_SIZE);
 575         if (err)
 576                 goto out;
 577
 578         if (!len)
 579                 return 0;
 580
 581         bytes = ((u64)len << cluster_bits) - off;
 582
 583         if (lcn == SPARSE_LCN) {
 584                 if (!create) {
 585                         if (bh->b_size > bytes)
 586                                 bh->b_size = bytes;
 587                         return 0;
 588                 }
 589                 WARN_ON(1);
 590         }
 591
 592         if (new)
 593                 set_buffer_new(bh);
 594
 595         lbo = ((u64)lcn << cluster_bits) + off;
 596
 597         set_buffer_mapped(bh);
 598         bh->b_bdev = sb->s_bdev;
 599         bh->b_blocknr = lbo >> sb->s_blocksize_bits;
 600
 601         valid = ni->i_valid;
 602
 603         if (ctx == GET_BLOCK_DIRECT_IO_W) {
 604                 /* ntfs_direct_IO will update ni->i_valid. */
 605                 if (vbo >= valid)
 606                         set_buffer_new(bh);
 607         } else if (create) {
 608                 /* Normal write. */
 609                 if (bytes > bh->b_size)
 610                         bytes = bh->b_size;
 611
 612                 if (vbo >= valid)
 613                         set_buffer_new(bh);
 614
 615                 if (vbo + bytes > valid) {
 616                         ni->i_valid = vbo + bytes;
 617                         mark_inode_dirty(inode);
 618                 }
 619         } else if (vbo >= valid) {
 620                 /* Read out of valid data. */
 621                 clear_buffer_mapped(bh);
 622         } else if (vbo + bytes <= valid) {
 623                 /* Normal read. */
 624         } else if (vbo + block_size <= valid) {
 625                 /* Normal short read. */
 626                 bytes = block_size;
 627         } else {
 628                 /*
 629                  * Read across valid size: vbo < valid && valid < vbo + block_size
 630                  */
 631                 bytes = block_size;
 632
 633                 if (page) {
 634                         u32 voff = valid - vbo;
 635
 636                         bh->b_size = block_size;
 637                         off = vbo & (PAGE_SIZE - 1);
 638                         set_bh_page(bh, page, off);
 639                         err = bh_read(bh, 0);
 640                         if (err < 0)
 641                                 goto out;
 642                         zero_user_segment(page, off + voff, off + block_size);
 643                 }
 644         }
 645
 646         if (bh->b_size > bytes)
 647                 bh->b_size = bytes;
 648
 649 #ifndef __LP64__
 650         if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
 651                 static_assert(sizeof(size_t) < sizeof(loff_t));
 652                 if (bytes > 0x40000000u)
 653                         bh->b_size = 0x40000000u;
 654         }
 655 #endif
 656
 657         return 0;
 658
 659 out:
 660         return err;
 661 }
 662
 663 int ntfs_get_block(struct inode *inode, sector_t vbn,
 664                    struct buffer_head *bh_result, int create)
 665 {
 666         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 667                                   bh_result, create, GET_BLOCK_GENERAL);
 668 }
 669
 670 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
 671                                struct buffer_head *bh_result, int create)
 672 {
 673         return ntfs_get_block_vbo(inode,
 674                                   (u64)vsn << inode->i_sb->s_blocksize_bits,
 675                                   bh_result, create, GET_BLOCK_BMAP);
 676 }
 677
 678 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
 679 {
 680         return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
 681 }
 682
 683 static int ntfs_read_folio(struct file *file, struct folio *folio)
 684 {
 685         struct page *page = &folio->page;
 686         int err;
 687         struct address_space *mapping = page->mapping;
 688         struct inode *inode = mapping->host;
 689         struct ntfs_inode *ni = ntfs_i(inode);
 690
 691         if (is_resident(ni)) {
 692                 ni_lock(ni);
 693                 err = attr_data_read_resident(ni, page);
 694                 ni_unlock(ni);
 695                 if (err != E_NTFS_NONRESIDENT) {
 696                         unlock_page(page);
 697                         return err;
 698                 }
 699         }
 700
 701         if (is_compressed(ni)) {
 702                 ni_lock(ni);
 703                 err = ni_readpage_cmpr(ni, page);
 704                 ni_unlock(ni);
 705                 return err;
 706         }
 707
 708         /* Normal + sparse files. */
 709         return mpage_read_folio(folio, ntfs_get_block);
 710 }
 711
 712 static void ntfs_readahead(struct readahead_control *rac)
 713 {
 714         struct address_space *mapping = rac->mapping;
 715         struct inode *inode = mapping->host;
 716         struct ntfs_inode *ni = ntfs_i(inode);
 717         u64 valid;
 718         loff_t pos;
 719
 720         if (is_resident(ni)) {
 721                 /* No readahead for resident. */
 722                 return;
 723         }
 724
 725         if (is_compressed(ni)) {
 726                 /* No readahead for compressed. */
 727                 return;
 728         }
 729
 730         valid = ni->i_valid;
 731         pos = readahead_pos(rac);
 732
 733         if (valid < i_size_read(inode) && pos <= valid &&
 734             valid < pos + readahead_length(rac)) {
 735                 /* Range cross 'valid'. Read it page by page. */
 736                 return;
 737         }
 738
 739         mpage_readahead(rac, ntfs_get_block);
 740 }
 741
 742 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
 743                                       struct buffer_head *bh_result, int create)
 744 {
 745         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 746                                   bh_result, create, GET_BLOCK_DIRECT_IO_R);
 747 }
 748
 749 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
 750                                       struct buffer_head *bh_result, int create)
 751 {
 752         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 753                                   bh_result, create, GET_BLOCK_DIRECT_IO_W);
 754 }
 755
 756 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 757 {
 758         struct file *file = iocb->ki_filp;
 759         struct address_space *mapping = file->f_mapping;
 760         struct inode *inode = mapping->host;
 761         struct ntfs_inode *ni = ntfs_i(inode);
 762         loff_t vbo = iocb->ki_pos;
 763         loff_t end;
 764         int wr = iov_iter_rw(iter) & WRITE;
 765         size_t iter_count = iov_iter_count(iter);
 766         loff_t valid;
 767         ssize_t ret;
 768
 769         if (is_resident(ni)) {
 770                 /* Switch to buffered write. */
 771                 ret = 0;
 772                 goto out;
 773         }
 774
 775         ret = blockdev_direct_IO(iocb, inode, iter,
 776                                  wr ? ntfs_get_block_direct_IO_W
 777                                     : ntfs_get_block_direct_IO_R);
 778
 779         if (ret > 0)
 780                 end = vbo + ret;
 781         else if (wr && ret == -EIOCBQUEUED)
 782                 end = vbo + iter_count;
 783         else
 784                 goto out;
 785
 786         valid = ni->i_valid;
 787         if (wr) {
 788                 if (end > valid && !S_ISBLK(inode->i_mode)) {
 789                         ni->i_valid = end;
 790                         mark_inode_dirty(inode);
 791                 }
 792         } else if (vbo < valid && valid < end) {
 793                 /* Fix page. */
 794                 iov_iter_revert(iter, end - valid);
 795                 iov_iter_zero(end - valid, iter);
 796         }
 797
 798 out:
 799         return ret;
 800 }
 801
 802 int ntfs_set_size(struct inode *inode, u64 new_size)
 803 {
 804         struct super_block *sb = inode->i_sb;
 805         struct ntfs_sb_info *sbi = sb->s_fs_info;
 806         struct ntfs_inode *ni = ntfs_i(inode);
 807         int err;
 808
 809         /* Check for maximum file size. */
 810         if (is_sparsed(ni) || is_compressed(ni)) {
 811                 if (new_size > sbi->maxbytes_sparse) {
 812                         err = -EFBIG;
 813                         goto out;
 814                 }
 815         } else if (new_size > sbi->maxbytes) {
 816                 err = -EFBIG;
 817                 goto out;
 818         }
 819
 820         ni_lock(ni);
 821         down_write(&ni->file.run_lock);
 822
 823         err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 824                             &ni->i_valid, true, NULL);
 825
 826         up_write(&ni->file.run_lock);
 827         ni_unlock(ni);
 828
 829         mark_inode_dirty(inode);
 830
 831 out:
 832         return err;
 833 }
 834
 835 static int ntfs_resident_writepage(struct folio *folio,
 836                 struct writeback_control *wbc, void *data)
 837 {
 838         struct address_space *mapping = data;
 839         struct ntfs_inode *ni = ntfs_i(mapping->host);
 840         int ret;
 841
 842         ni_lock(ni);
 843         ret = attr_data_write_resident(ni, &folio->page);
 844         ni_unlock(ni);
 845
 846         if (ret != E_NTFS_NONRESIDENT)
 847                 folio_unlock(folio);
 848         mapping_set_error(mapping, ret);
 849         return ret;
 850 }
 851
 852 static int ntfs_writepages(struct address_space *mapping,
 853                            struct writeback_control *wbc)
 854 {
 855         if (is_resident(ntfs_i(mapping->host)))
 856                 return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
 857                                          mapping);
 858         return mpage_writepages(mapping, wbc, ntfs_get_block);
 859 }
 860
 861 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
 862                                       struct buffer_head *bh_result, int create)
 863 {
 864         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 865                                   bh_result, create, GET_BLOCK_WRITE_BEGIN);
 866 }
 867
 868 int ntfs_write_begin(struct file *file, struct address_space *mapping,
 869                      loff_t pos, u32 len, struct page **pagep, void **fsdata)
 870 {
 871         int err;
 872         struct inode *inode = mapping->host;
 873         struct ntfs_inode *ni = ntfs_i(inode);
 874
 875         *pagep = NULL;
 876         if (is_resident(ni)) {
 877                 struct page *page = grab_cache_page_write_begin(
 878                         mapping, pos >> PAGE_SHIFT);
 879
 880                 if (!page) {
 881                         err = -ENOMEM;
 882                         goto out;
 883                 }
 884
 885                 ni_lock(ni);
 886                 err = attr_data_read_resident(ni, page);
 887                 ni_unlock(ni);
 888
 889                 if (!err) {
 890                         *pagep = page;
 891                         goto out;
 892                 }
 893                 unlock_page(page);
 894                 put_page(page);
 895
 896                 if (err != E_NTFS_NONRESIDENT)
 897                         goto out;
 898         }
 899
 900         err = block_write_begin(mapping, pos, len, pagep,
 901                                 ntfs_get_block_write_begin);
 902
 903 out:
 904         return err;
 905 }
 906
 907 /*
 908  * ntfs_write_end - Address_space_operations::write_end.
 909  */
 910 int ntfs_write_end(struct file *file, struct address_space *mapping,
 911                    loff_t pos, u32 len, u32 copied, struct page *page,
 912                    void *fsdata)
 913 {
 914         struct inode *inode = mapping->host;
 915         struct ntfs_inode *ni = ntfs_i(inode);
 916         u64 valid = ni->i_valid;
 917         bool dirty = false;
 918         int err;
 919
 920         if (is_resident(ni)) {
 921                 ni_lock(ni);
 922                 err = attr_data_write_resident(ni, page);
 923                 ni_unlock(ni);
 924                 if (!err) {
 925                         dirty = true;
 926                         /* Clear any buffers in page. */
 927                         if (page_has_buffers(page)) {
 928                                 struct buffer_head *head, *bh;
 929
 930                                 bh = head = page_buffers(page);
 931                                 do {
 932                                         clear_buffer_dirty(bh);
 933                                         clear_buffer_mapped(bh);
 934                                         set_buffer_uptodate(bh);
 935                                 } while (head != (bh = bh->b_this_page));
 936                         }
 937                         SetPageUptodate(page);
 938                         err = copied;
 939                 }
 940                 unlock_page(page);
 941                 put_page(page);
 942         } else {
 943                 err = generic_write_end(file, mapping, pos, len, copied, page,
 944                                         fsdata);
 945         }
 946
 947         if (err >= 0) {
 948                 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
 949                         inode->i_ctime = inode->i_mtime = current_time(inode);
 950                         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 951                         dirty = true;
 952                 }
 953
 954                 if (valid != ni->i_valid) {
 955                         /* ni->i_valid is changed in ntfs_get_block_vbo. */
 956                         dirty = true;
 957                 }
 958
 959                 if (pos + err > inode->i_size) {
 960                         inode->i_size = pos + err;
 961                         dirty = true;
 962                 }
 963
 964                 if (dirty)
 965                         mark_inode_dirty(inode);
 966         }
 967
 968         return err;
 969 }
 970
 971 int reset_log_file(struct inode *inode)
 972 {
 973         int err;
 974         loff_t pos = 0;
 975         u32 log_size = inode->i_size;
 976         struct address_space *mapping = inode->i_mapping;
 977
 978         for (;;) {
 979                 u32 len;
 980                 void *kaddr;
 981                 struct page *page;
 982
 983                 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
 984
 985                 err = block_write_begin(mapping, pos, len, &page,
 986                                         ntfs_get_block_write_begin);
 987                 if (err)
 988                         goto out;
 989
 990                 kaddr = kmap_atomic(page);
 991                 memset(kaddr, -1, len);
 992                 kunmap_atomic(kaddr);
 993                 flush_dcache_page(page);
 994
 995                 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
 996                 if (err < 0)
 997                         goto out;
 998                 pos += len;
 999
1000                 if (pos >= log_size)
1001                         break;
1002                 balance_dirty_pages_ratelimited(mapping);
1003         }
1004 out:
1005         mark_inode_dirty_sync(inode);
1006
1007         return err;
1008 }
1009
1010 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1011 {
1012         return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1013 }
1014
1015 int ntfs_sync_inode(struct inode *inode)
1016 {
1017         return _ni_write_inode(inode, 1);
1018 }
1019
1020 /*
1021  * writeback_inode - Helper function for ntfs_flush_inodes().
1022  *
1023  * This writes both the inode and the file data blocks, waiting
1024  * for in flight data blocks before the start of the call.  It
1025  * does not wait for any io started during the call.
1026  */
1027 static int writeback_inode(struct inode *inode)
1028 {
1029         int ret = sync_inode_metadata(inode, 0);
1030
1031         if (!ret)
1032                 ret = filemap_fdatawrite(inode->i_mapping);
1033         return ret;
1034 }
1035
1036 /*
1037  * ntfs_flush_inodes
1038  *
1039  * Write data and metadata corresponding to i1 and i2.  The io is
1040  * started but we do not wait for any of it to finish.
1041  *
1042  * filemap_flush() is used for the block device, so if there is a dirty
1043  * page for a block already in flight, we will not wait and start the
1044  * io over again.
1045  */
1046 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1047                       struct inode *i2)
1048 {
1049         int ret = 0;
1050
1051         if (i1)
1052                 ret = writeback_inode(i1);
1053         if (!ret && i2)
1054                 ret = writeback_inode(i2);
1055         if (!ret)
1056                 ret = sync_blockdev_nowait(sb->s_bdev);
1057         return ret;
1058 }
1059
1060 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1061 {
1062         pgoff_t idx;
1063
1064         /* Write non resident data. */
1065         for (idx = 0; bytes; idx++) {
1066                 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1067                 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1068
1069                 if (IS_ERR(page))
1070                         return PTR_ERR(page);
1071
1072                 lock_page(page);
1073                 WARN_ON(!PageUptodate(page));
1074                 ClearPageUptodate(page);
1075
1076                 memcpy(page_address(page), data, op);
1077
1078                 flush_dcache_page(page);
1079                 SetPageUptodate(page);
1080                 unlock_page(page);
1081
1082                 ntfs_unmap_page(page);
1083
1084                 bytes -= op;
1085                 data = Add2Ptr(data, PAGE_SIZE);
1086         }
1087         return 0;
1088 }
1089
1090 /*
1091  * ntfs_reparse_bytes
1092  *
1093  * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1094  * for unicode string of @uni_len length.
1095  */
1096 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1097 {
1098         /* Header + unicode string + decorated unicode string. */
1099         return sizeof(short) * (2 * uni_len + 4) +
1100                offsetof(struct REPARSE_DATA_BUFFER,
1101                         SymbolicLinkReparseBuffer.PathBuffer);
1102 }
1103
1104 static struct REPARSE_DATA_BUFFER *
1105 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1106                            u32 size, u16 *nsize)
1107 {
1108         int i, err;
1109         struct REPARSE_DATA_BUFFER *rp;
1110         __le16 *rp_name;
1111         typeof(rp->SymbolicLinkReparseBuffer) *rs;
1112
1113         rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1114         if (!rp)
1115                 return ERR_PTR(-ENOMEM);
1116
1117         rs = &rp->SymbolicLinkReparseBuffer;
1118         rp_name = rs->PathBuffer;
1119
1120         /* Convert link name to UTF-16. */
1121         err = ntfs_nls_to_utf16(sbi, symname, size,
1122                                 (struct cpu_str *)(rp_name - 1), 2 * size,
1123                                 UTF16_LITTLE_ENDIAN);
1124         if (err < 0)
1125                 goto out;
1126
1127         /* err = the length of unicode name of symlink. */
1128         *nsize = ntfs_reparse_bytes(err);
1129
1130         if (*nsize > sbi->reparse.max_size) {
1131                 err = -EFBIG;
1132                 goto out;
1133         }
1134
1135         /* Translate Linux '/' into Windows '\'. */
1136         for (i = 0; i < err; i++) {
1137                 if (rp_name[i] == cpu_to_le16('/'))
1138                         rp_name[i] = cpu_to_le16('\\');
1139         }
1140
1141         rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1142         rp->ReparseDataLength =
1143                 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1144                                               SymbolicLinkReparseBuffer));
1145
1146         /* PrintName + SubstituteName. */
1147         rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1148         rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1149         rs->PrintNameLength = rs->SubstituteNameOffset;
1150
1151         /*
1152          * TODO: Use relative path if possible to allow Windows to
1153          * parse this path.
1154          * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1155          */
1156         rs->Flags = 0;
1157
1158         memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1159
1160         /* Decorate SubstituteName. */
1161         rp_name += err;
1162         rp_name[0] = cpu_to_le16('\\');
1163         rp_name[1] = cpu_to_le16('?');
1164         rp_name[2] = cpu_to_le16('?');
1165         rp_name[3] = cpu_to_le16('\\');
1166
1167         return rp;
1168 out:
1169         kfree(rp);
1170         return ERR_PTR(err);
1171 }
1172
1173 /*
1174  * ntfs_create_inode
1175  *
1176  * Helper function for:
1177  * - ntfs_create
1178  * - ntfs_mknod
1179  * - ntfs_symlink
1180  * - ntfs_mkdir
1181  * - ntfs_atomic_open
1182  *
1183  * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1184  */
1185 struct inode *ntfs_create_inode(struct mnt_idmap *idmap,
1186                                 struct inode *dir, struct dentry *dentry,
1187                                 const struct cpu_str *uni, umode_t mode,
1188                                 dev_t dev, const char *symname, u32 size,
1189                                 struct ntfs_fnd *fnd)
1190 {
1191         int err;
1192         struct super_block *sb = dir->i_sb;
1193         struct ntfs_sb_info *sbi = sb->s_fs_info;
1194         const struct qstr *name = &dentry->d_name;
1195         CLST ino = 0;
1196         struct ntfs_inode *dir_ni = ntfs_i(dir);
1197         struct ntfs_inode *ni = NULL;
1198         struct inode *inode = NULL;
1199         struct ATTRIB *attr;
1200         struct ATTR_STD_INFO5 *std5;
1201         struct ATTR_FILE_NAME *fname;
1202         struct MFT_REC *rec;
1203         u32 asize, dsize, sd_size;
1204         enum FILE_ATTRIBUTE fa;
1205         __le32 security_id = SECURITY_ID_INVALID;
1206         CLST vcn;
1207         const void *sd;
1208         u16 t16, nsize = 0, aid = 0;
1209         struct INDEX_ROOT *root, *dir_root;
1210         struct NTFS_DE *e, *new_de = NULL;
1211         struct REPARSE_DATA_BUFFER *rp = NULL;
1212         bool rp_inserted = false;
1213
1214         if (!fnd)
1215                 ni_lock_dir(dir_ni);
1216
1217         dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1218         if (!dir_root) {
1219                 err = -EINVAL;
1220                 goto out1;
1221         }
1222
1223         if (S_ISDIR(mode)) {
1224                 /* Use parent's directory attributes. */
1225                 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1226                      FILE_ATTRIBUTE_ARCHIVE;
1227                 /*
1228                  * By default child directory inherits parent attributes.
1229                  * Root directory is hidden + system.
1230                  * Make an exception for children in root.
1231                  */
1232                 if (dir->i_ino == MFT_REC_ROOT)
1233                         fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1234         } else if (S_ISLNK(mode)) {
1235                 /* It is good idea that link should be the same type (file/dir) as target */
1236                 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1237
1238                 /*
1239                  * Linux: there are dir/file/symlink and so on.
1240                  * NTFS: symlinks are "dir + reparse" or "file + reparse"
1241                  * It is good idea to create:
1242                  * dir + reparse if 'symname' points to directory
1243                  * or
1244                  * file + reparse if 'symname' points to file
1245                  * Unfortunately kern_path hangs if symname contains 'dir'.
1246                  */
1247
1248                 /*
1249                  *      struct path path;
1250                  *
1251                  *      if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1252                  *              struct inode *target = d_inode(path.dentry);
1253                  *
1254                  *              if (S_ISDIR(target->i_mode))
1255                  *                      fa |= FILE_ATTRIBUTE_DIRECTORY;
1256                  *              // if ( target->i_sb == sb ){
1257                  *              //      use relative path?
1258                  *              // }
1259                  *              path_put(&path);
1260                  *      }
1261                  */
1262         } else if (S_ISREG(mode)) {
1263                 if (sbi->options->sparse) {
1264                         /* Sparsed regular file, cause option 'sparse'. */
1265                         fa = FILE_ATTRIBUTE_SPARSE_FILE |
1266                              FILE_ATTRIBUTE_ARCHIVE;
1267                 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1268                         /* Compressed regular file, if parent is compressed. */
1269                         fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1270                 } else {
1271                         /* Regular file, default attributes. */
1272                         fa = FILE_ATTRIBUTE_ARCHIVE;
1273                 }
1274         } else {
1275                 fa = FILE_ATTRIBUTE_ARCHIVE;
1276         }
1277
1278         /* If option "hide_dot_files" then set hidden attribute for dot files. */
1279         if (sbi->options->hide_dot_files && name->name[0] == '.')
1280                 fa |= FILE_ATTRIBUTE_HIDDEN;
1281
1282         if (!(mode & 0222))
1283                 fa |= FILE_ATTRIBUTE_READONLY;
1284
1285         /* Allocate PATH_MAX bytes. */
1286         new_de = __getname();
1287         if (!new_de) {
1288                 err = -ENOMEM;
1289                 goto out1;
1290         }
1291
1292         /* Mark rw ntfs as dirty. it will be cleared at umount. */
1293         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1294
1295         /* Step 1: allocate and fill new mft record. */
1296         err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1297         if (err)
1298                 goto out2;
1299
1300         ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY);
1301         if (IS_ERR(ni)) {
1302                 err = PTR_ERR(ni);
1303                 ni = NULL;
1304                 goto out3;
1305         }
1306         inode = &ni->vfs_inode;
1307         inode_init_owner(idmap, inode, dir, mode);
1308         mode = inode->i_mode;
1309
1310         inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
1311                 current_time(inode);
1312
1313         rec = ni->mi.mrec;
1314         rec->hard_links = cpu_to_le16(1);
1315         attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1316
1317         /* Get default security id. */
1318         sd = s_default_security;
1319         sd_size = sizeof(s_default_security);
1320
1321         if (is_ntfs3(sbi)) {
1322                 security_id = dir_ni->std_security_id;
1323                 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1324                         security_id = sbi->security.def_security_id;
1325
1326                         if (security_id == SECURITY_ID_INVALID &&
1327                             !ntfs_insert_security(sbi, sd, sd_size,
1328                                                   &security_id, NULL))
1329                                 sbi->security.def_security_id = security_id;
1330                 }
1331         }
1332
1333         /* Insert standard info. */
1334         std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1335
1336         if (security_id == SECURITY_ID_INVALID) {
1337                 dsize = sizeof(struct ATTR_STD_INFO);
1338         } else {
1339                 dsize = sizeof(struct ATTR_STD_INFO5);
1340                 std5->security_id = security_id;
1341                 ni->std_security_id = security_id;
1342         }
1343         asize = SIZEOF_RESIDENT + dsize;
1344
1345         attr->type = ATTR_STD;
1346         attr->size = cpu_to_le32(asize);
1347         attr->id = cpu_to_le16(aid++);
1348         attr->res.data_off = SIZEOF_RESIDENT_LE;
1349         attr->res.data_size = cpu_to_le32(dsize);
1350
1351         std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1352                 kernel2nt(&inode->i_atime);
1353
1354         ni->std_fa = fa;
1355         std5->fa = fa;
1356
1357         attr = Add2Ptr(attr, asize);
1358
1359         /* Insert file name. */
1360         err = fill_name_de(sbi, new_de, name, uni);
1361         if (err)
1362                 goto out4;
1363
1364         mi_get_ref(&ni->mi, &new_de->ref);
1365
1366         fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1367
1368         if (sbi->options->windows_names &&
1369             !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1370                 err = -EINVAL;
1371                 goto out4;
1372         }
1373
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, ALLOCATE_DEF,
1538                                                      &alen, 0, NULL, 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         if (!fnd)
1586                 ni_unlock(dir_ni);
1587
1588         inode->i_generation = le16_to_cpu(rec->seq);
1589
1590         dir->i_mtime = dir->i_ctime = inode->i_atime;
1591
1592         if (S_ISDIR(mode)) {
1593                 inode->i_op = &ntfs_dir_inode_operations;
1594                 inode->i_fop = &ntfs_dir_operations;
1595         } else if (S_ISLNK(mode)) {
1596                 inode->i_op = &ntfs_link_inode_operations;
1597                 inode->i_fop = NULL;
1598                 inode->i_mapping->a_ops = &ntfs_aops;
1599                 inode->i_size = size;
1600                 inode_nohighmem(inode);
1601         } else if (S_ISREG(mode)) {
1602                 inode->i_op = &ntfs_file_inode_operations;
1603                 inode->i_fop = &ntfs_file_operations;
1604                 inode->i_mapping->a_ops =
1605                         is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
1606                 init_rwsem(&ni->file.run_lock);
1607         } else {
1608                 inode->i_op = &ntfs_special_inode_operations;
1609                 init_special_inode(inode, mode, dev);
1610         }
1611
1612 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1613         if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1614                 err = ntfs_init_acl(idmap, inode, dir);
1615                 if (err)
1616                         goto out7;
1617         } else
1618 #endif
1619         {
1620                 inode->i_flags |= S_NOSEC;
1621         }
1622
1623         /* Write non resident data. */
1624         if (nsize) {
1625                 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0);
1626                 if (err)
1627                         goto out7;
1628         }
1629
1630         /*
1631          * Call 'd_instantiate' after inode->i_op is set
1632          * but before finish_open.
1633          */
1634         d_instantiate(dentry, inode);
1635
1636         ntfs_save_wsl_perm(inode);
1637         mark_inode_dirty(dir);
1638         mark_inode_dirty(inode);
1639
1640         /* Normal exit. */
1641         goto out2;
1642
1643 out7:
1644
1645         /* Undo 'indx_insert_entry'. */
1646         if (!fnd)
1647                 ni_lock_dir(dir_ni);
1648         indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
1649                           le16_to_cpu(new_de->key_size), sbi);
1650         /* ni_unlock(dir_ni); will be called later. */
1651 out6:
1652         if (rp_inserted)
1653                 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1654
1655 out5:
1656         if (!S_ISDIR(mode))
1657                 run_deallocate(sbi, &ni->file.run, false);
1658
1659 out4:
1660         clear_rec_inuse(rec);
1661         clear_nlink(inode);
1662         ni->mi.dirty = false;
1663         discard_new_inode(inode);
1664 out3:
1665         ntfs_mark_rec_free(sbi, ino, false);
1666
1667 out2:
1668         __putname(new_de);
1669         kfree(rp);
1670
1671 out1:
1672         if (err) {
1673                 if (!fnd)
1674                         ni_unlock(dir_ni);
1675                 return ERR_PTR(err);
1676         }
1677
1678         unlock_new_inode(inode);
1679
1680         return inode;
1681 }
1682
1683 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1684 {
1685         int err;
1686         struct ntfs_inode *ni = ntfs_i(inode);
1687         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1688         struct NTFS_DE *de;
1689
1690         /* Allocate PATH_MAX bytes. */
1691         de = __getname();
1692         if (!de)
1693                 return -ENOMEM;
1694
1695         /* Mark rw ntfs as dirty. It will be cleared at umount. */
1696         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1697
1698         /* Construct 'de'. */
1699         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1700         if (err)
1701                 goto out;
1702
1703         err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1704 out:
1705         __putname(de);
1706         return err;
1707 }
1708
1709 /*
1710  * ntfs_unlink_inode
1711  *
1712  * inode_operations::unlink
1713  * inode_operations::rmdir
1714  */
1715 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1716 {
1717         int err;
1718         struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1719         struct inode *inode = d_inode(dentry);
1720         struct ntfs_inode *ni = ntfs_i(inode);
1721         struct ntfs_inode *dir_ni = ntfs_i(dir);
1722         struct NTFS_DE *de, *de2 = NULL;
1723         int undo_remove;
1724
1725         if (ntfs_is_meta_file(sbi, ni->mi.rno))
1726                 return -EINVAL;
1727
1728         /* Allocate PATH_MAX bytes. */
1729         de = __getname();
1730         if (!de)
1731                 return -ENOMEM;
1732
1733         ni_lock(ni);
1734
1735         if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1736                 err = -ENOTEMPTY;
1737                 goto out;
1738         }
1739
1740         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1741         if (err < 0)
1742                 goto out;
1743
1744         undo_remove = 0;
1745         err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1746
1747         if (!err) {
1748                 drop_nlink(inode);
1749                 dir->i_mtime = dir->i_ctime = current_time(dir);
1750                 mark_inode_dirty(dir);
1751                 inode->i_ctime = dir->i_ctime;
1752                 if (inode->i_nlink)
1753                         mark_inode_dirty(inode);
1754         } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1755                 _ntfs_bad_inode(inode);
1756         } else {
1757                 if (ni_is_dirty(dir))
1758                         mark_inode_dirty(dir);
1759                 if (ni_is_dirty(inode))
1760                         mark_inode_dirty(inode);
1761         }
1762
1763 out:
1764         ni_unlock(ni);
1765         __putname(de);
1766         return err;
1767 }
1768
1769 void ntfs_evict_inode(struct inode *inode)
1770 {
1771         truncate_inode_pages_final(&inode->i_data);
1772
1773         if (inode->i_nlink)
1774                 _ni_write_inode(inode, inode_needs_sync(inode));
1775
1776         invalidate_inode_buffers(inode);
1777         clear_inode(inode);
1778
1779         ni_clear(ntfs_i(inode));
1780 }
1781
1782 /*
1783  * ntfs_translate_junction
1784  *
1785  * Translate a Windows junction target to the Linux equivalent.
1786  * On junctions, targets are always absolute (they include the drive
1787  * letter). We have no way of knowing if the target is for the current
1788  * mounted device or not so we just assume it is.
1789  */
1790 static int ntfs_translate_junction(const struct super_block *sb,
1791                                    const struct dentry *link_de, char *target,
1792                                    int target_len, int target_max)
1793 {
1794         int tl_len, err = target_len;
1795         char *link_path_buffer = NULL, *link_path;
1796         char *translated = NULL;
1797         char *target_start;
1798         int copy_len;
1799
1800         link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1801         if (!link_path_buffer) {
1802                 err = -ENOMEM;
1803                 goto out;
1804         }
1805         /* Get link path, relative to mount point */
1806         link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1807         if (IS_ERR(link_path)) {
1808                 ntfs_err(sb, "Error getting link path");
1809                 err = -EINVAL;
1810                 goto out;
1811         }
1812
1813         translated = kmalloc(PATH_MAX, GFP_NOFS);
1814         if (!translated) {
1815                 err = -ENOMEM;
1816                 goto out;
1817         }
1818
1819         /* Make translated path a relative path to mount point */
1820         strcpy(translated, "./");
1821         ++link_path; /* Skip leading / */
1822         for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1823                 if (*link_path == '/') {
1824                         if (PATH_MAX - tl_len < sizeof("../")) {
1825                                 ntfs_err(sb,
1826                                          "Link path %s has too many components",
1827                                          link_path);
1828                                 err = -EINVAL;
1829                                 goto out;
1830                         }
1831                         strcpy(translated + tl_len, "../");
1832                         tl_len += sizeof("../") - 1;
1833                 }
1834         }
1835
1836         /* Skip drive letter */
1837         target_start = target;
1838         while (*target_start && *target_start != ':')
1839                 ++target_start;
1840
1841         if (!*target_start) {
1842                 ntfs_err(sb, "Link target (%s) missing drive separator",
1843                          target);
1844                 err = -EINVAL;
1845                 goto out;
1846         }
1847
1848         /* Skip drive separator and leading /, if exists */
1849         target_start += 1 + (target_start[1] == '/');
1850         copy_len = target_len - (target_start - target);
1851
1852         if (PATH_MAX - tl_len <= copy_len) {
1853                 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1854                          target_start, PATH_MAX - tl_len, copy_len);
1855                 err = -EINVAL;
1856                 goto out;
1857         }
1858
1859         /* translated path has a trailing / and target_start does not */
1860         strcpy(translated + tl_len, target_start);
1861         tl_len += copy_len;
1862         if (target_max <= tl_len) {
1863                 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1864                          translated, target_max, tl_len);
1865                 err = -EINVAL;
1866                 goto out;
1867         }
1868         strcpy(target, translated);
1869         err = tl_len;
1870
1871 out:
1872         kfree(link_path_buffer);
1873         kfree(translated);
1874         return err;
1875 }
1876
1877 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1878                                       struct inode *inode, char *buffer,
1879                                       int buflen)
1880 {
1881         int i, err = -EINVAL;
1882         struct ntfs_inode *ni = ntfs_i(inode);
1883         struct super_block *sb = inode->i_sb;
1884         struct ntfs_sb_info *sbi = sb->s_fs_info;
1885         u64 size;
1886         u16 ulen = 0;
1887         void *to_free = NULL;
1888         struct REPARSE_DATA_BUFFER *rp;
1889         const __le16 *uname;
1890         struct ATTRIB *attr;
1891
1892         /* Reparse data present. Try to parse it. */
1893         static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1894         static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1895
1896         *buffer = 0;
1897
1898         attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1899         if (!attr)
1900                 goto out;
1901
1902         if (!attr->non_res) {
1903                 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1904                 if (!rp)
1905                         goto out;
1906                 size = le32_to_cpu(attr->res.data_size);
1907         } else {
1908                 size = le64_to_cpu(attr->nres.data_size);
1909                 rp = NULL;
1910         }
1911
1912         if (size > sbi->reparse.max_size || size <= sizeof(u32))
1913                 goto out;
1914
1915         if (!rp) {
1916                 rp = kmalloc(size, GFP_NOFS);
1917                 if (!rp) {
1918                         err = -ENOMEM;
1919                         goto out;
1920                 }
1921                 to_free = rp;
1922                 /* Read into temporal buffer. */
1923                 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1924                 if (err)
1925                         goto out;
1926         }
1927
1928         /* Microsoft Tag. */
1929         switch (rp->ReparseTag) {
1930         case IO_REPARSE_TAG_MOUNT_POINT:
1931                 /* Mount points and junctions. */
1932                 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1933                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1934                                      MountPointReparseBuffer.PathBuffer))
1935                         goto out;
1936                 uname = Add2Ptr(rp,
1937                                 offsetof(struct REPARSE_DATA_BUFFER,
1938                                          MountPointReparseBuffer.PathBuffer) +
1939                                         le16_to_cpu(rp->MountPointReparseBuffer
1940                                                             .PrintNameOffset));
1941                 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1942                 break;
1943
1944         case IO_REPARSE_TAG_SYMLINK:
1945                 /* FolderSymbolicLink */
1946                 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1947                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1948                                      SymbolicLinkReparseBuffer.PathBuffer))
1949                         goto out;
1950                 uname = Add2Ptr(
1951                         rp, offsetof(struct REPARSE_DATA_BUFFER,
1952                                      SymbolicLinkReparseBuffer.PathBuffer) +
1953                                     le16_to_cpu(rp->SymbolicLinkReparseBuffer
1954                                                         .PrintNameOffset));
1955                 ulen = le16_to_cpu(
1956                         rp->SymbolicLinkReparseBuffer.PrintNameLength);
1957                 break;
1958
1959         case IO_REPARSE_TAG_CLOUD:
1960         case IO_REPARSE_TAG_CLOUD_1:
1961         case IO_REPARSE_TAG_CLOUD_2:
1962         case IO_REPARSE_TAG_CLOUD_3:
1963         case IO_REPARSE_TAG_CLOUD_4:
1964         case IO_REPARSE_TAG_CLOUD_5:
1965         case IO_REPARSE_TAG_CLOUD_6:
1966         case IO_REPARSE_TAG_CLOUD_7:
1967         case IO_REPARSE_TAG_CLOUD_8:
1968         case IO_REPARSE_TAG_CLOUD_9:
1969         case IO_REPARSE_TAG_CLOUD_A:
1970         case IO_REPARSE_TAG_CLOUD_B:
1971         case IO_REPARSE_TAG_CLOUD_C:
1972         case IO_REPARSE_TAG_CLOUD_D:
1973         case IO_REPARSE_TAG_CLOUD_E:
1974         case IO_REPARSE_TAG_CLOUD_F:
1975                 err = sizeof("OneDrive") - 1;
1976                 if (err > buflen)
1977                         err = buflen;
1978                 memcpy(buffer, "OneDrive", err);
1979                 goto out;
1980
1981         default:
1982                 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
1983                         /* Unknown Microsoft Tag. */
1984                         goto out;
1985                 }
1986                 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
1987                     size <= sizeof(struct REPARSE_POINT)) {
1988                         goto out;
1989                 }
1990
1991                 /* Users tag. */
1992                 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
1993                 ulen = le16_to_cpu(rp->ReparseDataLength) -
1994                        sizeof(struct REPARSE_POINT);
1995         }
1996
1997         /* Convert nlen from bytes to UNICODE chars. */
1998         ulen >>= 1;
1999
2000         /* Check that name is available. */
2001         if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2002                 goto out;
2003
2004         /* If name is already zero terminated then truncate it now. */
2005         if (!uname[ulen - 1])
2006                 ulen -= 1;
2007
2008         err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2009
2010         if (err < 0)
2011                 goto out;
2012
2013         /* Translate Windows '\' into Linux '/'. */
2014         for (i = 0; i < err; i++) {
2015                 if (buffer[i] == '\\')
2016                         buffer[i] = '/';
2017         }
2018
2019         /* Always set last zero. */
2020         buffer[err] = 0;
2021
2022         /* If this is a junction, translate the link target. */
2023         if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2024                 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2025
2026 out:
2027         kfree(to_free);
2028         return err;
2029 }
2030
2031 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2032                                  struct delayed_call *done)
2033 {
2034         int err;
2035         char *ret;
2036
2037         if (!de)
2038                 return ERR_PTR(-ECHILD);
2039
2040         ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2041         if (!ret)
2042                 return ERR_PTR(-ENOMEM);
2043
2044         err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2045         if (err < 0) {
2046                 kfree(ret);
2047                 return ERR_PTR(err);
2048         }
2049
2050         set_delayed_call(done, kfree_link, ret);
2051
2052         return ret;
2053 }
2054
2055 // clang-format off
2056 const struct inode_operations ntfs_link_inode_operations = {
2057         .get_link       = ntfs_get_link,
2058         .setattr        = ntfs3_setattr,
2059         .listxattr      = ntfs_listxattr,
2060         .permission     = ntfs_permission,
2061 };
2062
2063 const struct address_space_operations ntfs_aops = {
2064         .read_folio     = ntfs_read_folio,
2065         .readahead      = ntfs_readahead,
2066         .writepages     = ntfs_writepages,
2067         .write_begin    = ntfs_write_begin,
2068         .write_end      = ntfs_write_end,
2069         .direct_IO      = ntfs_direct_IO,
2070         .bmap           = ntfs_bmap,
2071         .dirty_folio    = block_dirty_folio,
2072         .migrate_folio  = buffer_migrate_folio,
2073         .invalidate_folio = block_invalidate_folio,
2074 };
2075
2076 const struct address_space_operations ntfs_aops_cmpr = {
2077         .read_folio     = ntfs_read_folio,
2078         .readahead      = ntfs_readahead,
2079 };
2080 // clang-format on