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         struct timespec64 ts;
  48
  49         inode->i_op = NULL;
  50         /* Setup 'uid' and 'gid' */
  51         inode->i_uid = sbi->options->fs_uid;
  52         inode->i_gid = sbi->options->fs_gid;
  53
  54         err = mi_init(&ni->mi, sbi, ino);
  55         if (err)
  56                 goto out;
  57
  58         if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
  59                 t64 = sbi->mft.lbo >> sbi->cluster_bits;
  60                 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
  61                 sbi->mft.ni = ni;
  62                 init_rwsem(&ni->file.run_lock);
  63
  64                 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
  65                         err = -ENOMEM;
  66                         goto out;
  67                 }
  68         }
  69
  70         err = mi_read(&ni->mi, ino == MFT_REC_MFT);
  71
  72         if (err)
  73                 goto out;
  74
  75         rec = ni->mi.mrec;
  76
  77         if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
  78                 ;
  79         } else if (ref->seq != rec->seq) {
  80                 err = -EINVAL;
  81                 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
  82                          le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
  83                 goto out;
  84         } else if (!is_rec_inuse(rec)) {
  85                 err = -ESTALE;
  86                 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
  87                 goto out;
  88         }
  89
  90         if (le32_to_cpu(rec->total) != sbi->record_size) {
  91                 /* Bad inode? */
  92                 err = -EINVAL;
  93                 goto out;
  94         }
  95
  96         if (!is_rec_base(rec)) {
  97                 err = -EINVAL;
  98                 goto out;
  99         }
 100
 101         /* Record should contain $I30 root. */
 102         is_dir = rec->flags & RECORD_FLAG_DIR;
 103
 104         /* MFT_REC_MFT is not a dir */
 105         if (is_dir && ino == MFT_REC_MFT) {
 106                 err = -EINVAL;
 107                 goto out;
 108         }
 109
 110         inode->i_generation = le16_to_cpu(rec->seq);
 111
 112         /* Enumerate all struct Attributes MFT. */
 113         le = NULL;
 114         attr = NULL;
 115
 116         /*
 117          * To reduce tab pressure use goto instead of
 118          * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
 119          */
 120 next_attr:
 121         run = NULL;
 122         err = -EINVAL;
 123         attr = ni_enum_attr_ex(ni, attr, &le, NULL);
 124         if (!attr)
 125                 goto end_enum;
 126
 127         if (le && le->vcn) {
 128                 /* This is non primary attribute segment. Ignore if not MFT. */
 129                 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
 130                         goto next_attr;
 131
 132                 run = &ni->file.run;
 133                 asize = le32_to_cpu(attr->size);
 134                 goto attr_unpack_run;
 135         }
 136
 137         roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
 138         rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
 139         asize = le32_to_cpu(attr->size);
 140
 141         /*
 142          * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'.
 143          * There not critical to check this case again
 144          */
 145         if (attr->name_len &&
 146             sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) >
 147                     asize)
 148                 goto out;
 149
 150         if (attr->non_res) {
 151                 t64 = le64_to_cpu(attr->nres.alloc_size);
 152                 if (le64_to_cpu(attr->nres.data_size) > t64 ||
 153                     le64_to_cpu(attr->nres.valid_size) > t64)
 154                         goto out;
 155         }
 156
 157         switch (attr->type) {
 158         case ATTR_STD:
 159                 if (attr->non_res ||
 160                     asize < sizeof(struct ATTR_STD_INFO) + roff ||
 161                     rsize < sizeof(struct ATTR_STD_INFO))
 162                         goto out;
 163
 164                 if (std5)
 165                         goto next_attr;
 166
 167                 std5 = Add2Ptr(attr, roff);
 168
 169 #ifdef STATX_BTIME
 170                 nt2kernel(std5->cr_time, &ni->i_crtime);
 171 #endif
 172                 nt2kernel(std5->a_time, &ts);
 173                 inode_set_atime_to_ts(inode, ts);
 174                 nt2kernel(std5->c_time, &ts);
 175                 inode_set_ctime_to_ts(inode, ts);
 176                 nt2kernel(std5->m_time, &ts);
 177                 inode_set_mtime_to_ts(inode, ts);
 178
 179                 ni->std_fa = std5->fa;
 180
 181                 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
 182                     rsize >= sizeof(struct ATTR_STD_INFO5))
 183                         ni->std_security_id = std5->security_id;
 184                 goto next_attr;
 185
 186         case ATTR_LIST:
 187                 if (attr->name_len || le || ino == MFT_REC_LOG)
 188                         goto out;
 189
 190                 err = ntfs_load_attr_list(ni, attr);
 191                 if (err)
 192                         goto out;
 193
 194                 le = NULL;
 195                 attr = NULL;
 196                 goto next_attr;
 197
 198         case ATTR_NAME:
 199                 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
 200                     rsize < SIZEOF_ATTRIBUTE_FILENAME)
 201                         goto out;
 202
 203                 fname = Add2Ptr(attr, roff);
 204                 if (fname->type == FILE_NAME_DOS)
 205                         goto next_attr;
 206
 207                 names += 1;
 208                 if (name && name->len == fname->name_len &&
 209                     !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
 210                                         NULL, false))
 211                         is_match = true;
 212
 213                 goto next_attr;
 214
 215         case ATTR_DATA:
 216                 if (is_dir) {
 217                         /* Ignore data attribute in dir record. */
 218                         goto next_attr;
 219                 }
 220
 221                 if (ino == MFT_REC_BADCLUST && !attr->non_res)
 222                         goto next_attr;
 223
 224                 if (attr->name_len &&
 225                     ((ino != MFT_REC_BADCLUST || !attr->non_res ||
 226                       attr->name_len != ARRAY_SIZE(BAD_NAME) ||
 227                       memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
 228                      (ino != MFT_REC_SECURE || !attr->non_res ||
 229                       attr->name_len != ARRAY_SIZE(SDS_NAME) ||
 230                       memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
 231                         /* File contains stream attribute. Ignore it. */
 232                         goto next_attr;
 233                 }
 234
 235                 if (is_attr_sparsed(attr))
 236                         ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
 237                 else
 238                         ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
 239
 240                 if (is_attr_compressed(attr))
 241                         ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
 242                 else
 243                         ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
 244
 245                 if (is_attr_encrypted(attr))
 246                         ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
 247                 else
 248                         ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
 249
 250                 if (!attr->non_res) {
 251                         ni->i_valid = inode->i_size = rsize;
 252                         inode_set_bytes(inode, rsize);
 253                 }
 254
 255                 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
 256
 257                 if (!attr->non_res) {
 258                         ni->ni_flags |= NI_FLAG_RESIDENT;
 259                         goto next_attr;
 260                 }
 261
 262                 inode_set_bytes(inode, attr_ondisk_size(attr));
 263
 264                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 265                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 266                 if (!attr->nres.alloc_size)
 267                         goto next_attr;
 268
 269                 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
 270                                               &ni->file.run;
 271                 break;
 272
 273         case ATTR_ROOT:
 274                 if (attr->non_res)
 275                         goto out;
 276
 277                 root = Add2Ptr(attr, roff);
 278
 279                 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
 280                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 281                         goto next_attr;
 282
 283                 if (root->type != ATTR_NAME ||
 284                     root->rule != NTFS_COLLATION_TYPE_FILENAME)
 285                         goto out;
 286
 287                 if (!is_dir)
 288                         goto next_attr;
 289
 290                 is_root = true;
 291                 ni->ni_flags |= NI_FLAG_DIR;
 292
 293                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
 294                 if (err)
 295                         goto out;
 296
 297                 mode = sb->s_root ?
 298                                (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
 299                                (S_IFDIR | 0777);
 300                 goto next_attr;
 301
 302         case ATTR_ALLOC:
 303                 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
 304                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 305                         goto next_attr;
 306
 307                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 308                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 309                 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
 310
 311                 run = &ni->dir.alloc_run;
 312                 break;
 313
 314         case ATTR_BITMAP:
 315                 if (ino == MFT_REC_MFT) {
 316                         if (!attr->non_res)
 317                                 goto out;
 318 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
 319                         /* 0x20000000 = 2^32 / 8 */
 320                         if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
 321                                 goto out;
 322 #endif
 323                         run = &sbi->mft.bitmap.run;
 324                         break;
 325                 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
 326                            !memcmp(attr_name(attr), I30_NAME,
 327                                    sizeof(I30_NAME)) &&
 328                            attr->non_res) {
 329                         run = &ni->dir.bitmap_run;
 330                         break;
 331                 }
 332                 goto next_attr;
 333
 334         case ATTR_REPARSE:
 335                 if (attr->name_len)
 336                         goto next_attr;
 337
 338                 rp_fa = ni_parse_reparse(ni, attr, &rp);
 339                 switch (rp_fa) {
 340                 case REPARSE_LINK:
 341                         /*
 342                          * Normal symlink.
 343                          * Assume one unicode symbol == one utf8.
 344                          */
 345                         inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
 346                                                             .PrintNameLength) /
 347                                         sizeof(u16);
 348                         ni->i_valid = inode->i_size;
 349                         /* Clear directory bit. */
 350                         if (ni->ni_flags & NI_FLAG_DIR) {
 351                                 indx_clear(&ni->dir);
 352                                 memset(&ni->dir, 0, sizeof(ni->dir));
 353                                 ni->ni_flags &= ~NI_FLAG_DIR;
 354                         } else {
 355                                 run_close(&ni->file.run);
 356                         }
 357                         mode = S_IFLNK | 0777;
 358                         is_dir = false;
 359                         if (attr->non_res) {
 360                                 run = &ni->file.run;
 361                                 goto attr_unpack_run; // Double break.
 362                         }
 363                         break;
 364
 365                 case REPARSE_COMPRESSED:
 366                         break;
 367
 368                 case REPARSE_DEDUPLICATED:
 369                         break;
 370                 }
 371                 goto next_attr;
 372
 373         case ATTR_EA_INFO:
 374                 if (!attr->name_len &&
 375                     resident_data_ex(attr, sizeof(struct EA_INFO))) {
 376                         ni->ni_flags |= NI_FLAG_EA;
 377                         /*
 378                          * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
 379                          */
 380                         inode->i_mode = mode;
 381                         ntfs_get_wsl_perm(inode);
 382                         mode = inode->i_mode;
 383                 }
 384                 goto next_attr;
 385
 386         default:
 387                 goto next_attr;
 388         }
 389
 390 attr_unpack_run:
 391         roff = le16_to_cpu(attr->nres.run_off);
 392
 393         if (roff > asize) {
 394                 err = -EINVAL;
 395                 goto out;
 396         }
 397
 398         t64 = le64_to_cpu(attr->nres.svcn);
 399
 400         err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
 401                             t64, Add2Ptr(attr, roff), asize - roff);
 402         if (err < 0)
 403                 goto out;
 404         err = 0;
 405         goto next_attr;
 406
 407 end_enum:
 408
 409         if (!std5)
 410                 goto out;
 411
 412         if (!is_match && name) {
 413                 err = -ENOENT;
 414                 goto out;
 415         }
 416
 417         if (std5->fa & FILE_ATTRIBUTE_READONLY)
 418                 mode &= ~0222;
 419
 420         if (!names) {
 421                 err = -EINVAL;
 422                 goto out;
 423         }
 424
 425         if (names != le16_to_cpu(rec->hard_links)) {
 426                 /* Correct minor error on the fly. Do not mark inode as dirty. */
 427                 ntfs_inode_warn(inode, "Correct links count -> %u.", names);
 428                 rec->hard_links = cpu_to_le16(names);
 429                 ni->mi.dirty = true;
 430         }
 431
 432         set_nlink(inode, names);
 433
 434         if (S_ISDIR(mode)) {
 435                 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
 436
 437                 /*
 438                  * Dot and dot-dot should be included in count but was not
 439                  * included in enumeration.
 440                  * Usually a hard links to directories are disabled.
 441                  */
 442                 inode->i_op = &ntfs_dir_inode_operations;
 443                 if (is_legacy_ntfs(inode->i_sb))
 444                         inode->i_fop = &ntfs_legacy_dir_operations;
 445                 else
 446                         inode->i_fop = &ntfs_dir_operations;
 447                 ni->i_valid = 0;
 448         } else if (S_ISLNK(mode)) {
 449                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 450                 inode->i_op = &ntfs_link_inode_operations;
 451                 inode->i_fop = NULL;
 452                 inode_nohighmem(inode);
 453         } else if (S_ISREG(mode)) {
 454                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 455                 inode->i_op = &ntfs_file_inode_operations;
 456                 if (is_legacy_ntfs(inode->i_sb))
 457                         inode->i_fop = &ntfs_legacy_file_operations;
 458                 else
 459                         inode->i_fop = &ntfs_file_operations;
 460                 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
 461                                                               &ntfs_aops;
 462                 if (ino != MFT_REC_MFT)
 463                         init_rwsem(&ni->file.run_lock);
 464         } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
 465                    S_ISSOCK(mode)) {
 466                 inode->i_op = &ntfs_special_inode_operations;
 467                 init_special_inode(inode, mode, inode->i_rdev);
 468         } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
 469                    fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
 470                 /* Records in $Extend are not a files or general directories. */
 471                 inode->i_op = &ntfs_file_inode_operations;
 472         } else {
 473                 err = -EINVAL;
 474                 goto out;
 475         }
 476
 477         if ((sbi->options->sys_immutable &&
 478              (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
 479             !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
 480                 inode->i_flags |= S_IMMUTABLE;
 481         } else {
 482                 inode->i_flags &= ~S_IMMUTABLE;
 483         }
 484
 485         inode->i_mode = mode;
 486         if (!(ni->ni_flags & NI_FLAG_EA)) {
 487                 /* If no xattr then no security (stored in xattr). */
 488                 inode->i_flags |= S_NOSEC;
 489         }
 490
 491         if (ino == MFT_REC_MFT && !sb->s_root)
 492                 sbi->mft.ni = NULL;
 493
 494         unlock_new_inode(inode);
 495
 496         return inode;
 497
 498 out:
 499         if (ino == MFT_REC_MFT && !sb->s_root)
 500                 sbi->mft.ni = NULL;
 501
 502         iget_failed(inode);
 503         return ERR_PTR(err);
 504 }
 505
 506 /*
 507  * ntfs_test_inode
 508  *
 509  * Return: 1 if match.
 510  */
 511 static int ntfs_test_inode(struct inode *inode, void *data)
 512 {
 513         struct MFT_REF *ref = data;
 514
 515         return ino_get(ref) == inode->i_ino;
 516 }
 517
 518 static int ntfs_set_inode(struct inode *inode, void *data)
 519 {
 520         const struct MFT_REF *ref = data;
 521
 522         inode->i_ino = ino_get(ref);
 523         return 0;
 524 }
 525
 526 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
 527                          const struct cpu_str *name)
 528 {
 529         struct inode *inode;
 530
 531         inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
 532                              (void *)ref);
 533         if (unlikely(!inode))
 534                 return ERR_PTR(-ENOMEM);
 535
 536         /* If this is a freshly allocated inode, need to read it now. */
 537         if (inode->i_state & I_NEW)
 538                 inode = ntfs_read_mft(inode, name, ref);
 539         else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
 540                 /* Inode overlaps? */
 541                 _ntfs_bad_inode(inode);
 542         }
 543
 544         if (IS_ERR(inode) && name)
 545                 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
 546
 547         return inode;
 548 }
 549
 550 enum get_block_ctx {
 551         GET_BLOCK_GENERAL = 0,
 552         GET_BLOCK_WRITE_BEGIN = 1,
 553         GET_BLOCK_DIRECT_IO_R = 2,
 554         GET_BLOCK_DIRECT_IO_W = 3,
 555         GET_BLOCK_BMAP = 4,
 556 };
 557
 558 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
 559                                        struct buffer_head *bh, int create,
 560                                        enum get_block_ctx ctx)
 561 {
 562         struct super_block *sb = inode->i_sb;
 563         struct ntfs_sb_info *sbi = sb->s_fs_info;
 564         struct ntfs_inode *ni = ntfs_i(inode);
 565         struct folio *folio = bh->b_folio;
 566         u8 cluster_bits = sbi->cluster_bits;
 567         u32 block_size = sb->s_blocksize;
 568         u64 bytes, lbo, valid;
 569         u32 off;
 570         int err;
 571         CLST vcn, lcn, len;
 572         bool new;
 573
 574         /* Clear previous state. */
 575         clear_buffer_new(bh);
 576         clear_buffer_uptodate(bh);
 577
 578         if (is_resident(ni)) {
 579                 ni_lock(ni);
 580                 err = attr_data_read_resident(ni, &folio->page);
 581                 ni_unlock(ni);
 582
 583                 if (!err)
 584                         set_buffer_uptodate(bh);
 585                 bh->b_size = block_size;
 586                 return err;
 587         }
 588
 589         vcn = vbo >> cluster_bits;
 590         off = vbo & sbi->cluster_mask;
 591         new = false;
 592
 593         err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
 594                                   create && sbi->cluster_size > PAGE_SIZE);
 595         if (err)
 596                 goto out;
 597
 598         if (!len)
 599                 return 0;
 600
 601         bytes = ((u64)len << cluster_bits) - off;
 602
 603         if (lcn == SPARSE_LCN) {
 604                 if (!create) {
 605                         if (bh->b_size > bytes)
 606                                 bh->b_size = bytes;
 607                         return 0;
 608                 }
 609                 WARN_ON(1);
 610         }
 611
 612         if (new)
 613                 set_buffer_new(bh);
 614
 615         lbo = ((u64)lcn << cluster_bits) + off;
 616
 617         set_buffer_mapped(bh);
 618         bh->b_bdev = sb->s_bdev;
 619         bh->b_blocknr = lbo >> sb->s_blocksize_bits;
 620
 621         valid = ni->i_valid;
 622
 623         if (ctx == GET_BLOCK_DIRECT_IO_W) {
 624                 /* ntfs_direct_IO will update ni->i_valid. */
 625                 if (vbo >= valid)
 626                         set_buffer_new(bh);
 627         } else if (create) {
 628                 /* Normal write. */
 629                 if (bytes > bh->b_size)
 630                         bytes = bh->b_size;
 631
 632                 if (vbo >= valid)
 633                         set_buffer_new(bh);
 634
 635                 if (vbo + bytes > valid) {
 636                         ni->i_valid = vbo + bytes;
 637                         mark_inode_dirty(inode);
 638                 }
 639         } else if (vbo >= valid) {
 640                 /* Read out of valid data. */
 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 (folio) {
 654                         u32 voff = valid - vbo;
 655
 656                         bh->b_size = block_size;
 657                         off = vbo & (PAGE_SIZE - 1);
 658                         folio_set_bh(bh, folio, off);
 659
 660                         if (bh_read(bh, 0) < 0) {
 661                                 err = -EIO;
 662                                 goto out;
 663                         }
 664                         folio_zero_segment(folio, off + voff, off + block_size);
 665                 }
 666         }
 667
 668         if (bh->b_size > bytes)
 669                 bh->b_size = bytes;
 670
 671 #ifndef __LP64__
 672         if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
 673                 static_assert(sizeof(size_t) < sizeof(loff_t));
 674                 if (bytes > 0x40000000u)
 675                         bh->b_size = 0x40000000u;
 676         }
 677 #endif
 678
 679         return 0;
 680
 681 out:
 682         return err;
 683 }
 684
 685 int ntfs_get_block(struct inode *inode, sector_t vbn,
 686                    struct buffer_head *bh_result, int create)
 687 {
 688         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 689                                   bh_result, create, GET_BLOCK_GENERAL);
 690 }
 691
 692 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
 693                                struct buffer_head *bh_result, int create)
 694 {
 695         return ntfs_get_block_vbo(inode,
 696                                   (u64)vsn << inode->i_sb->s_blocksize_bits,
 697                                   bh_result, create, GET_BLOCK_BMAP);
 698 }
 699
 700 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
 701 {
 702         return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
 703 }
 704
 705 static int ntfs_read_folio(struct file *file, struct folio *folio)
 706 {
 707         struct page *page = &folio->page;
 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_read_folio(folio, 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_resident_writepage(struct folio *folio,
 858                                    struct writeback_control *wbc, void *data)
 859 {
 860         struct address_space *mapping = data;
 861         struct inode *inode = mapping->host;
 862         struct ntfs_inode *ni = ntfs_i(inode);
 863         int ret;
 864
 865         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 866                 return -EIO;
 867
 868         ni_lock(ni);
 869         ret = attr_data_write_resident(ni, &folio->page);
 870         ni_unlock(ni);
 871
 872         if (ret != E_NTFS_NONRESIDENT)
 873                 folio_unlock(folio);
 874         mapping_set_error(mapping, ret);
 875         return ret;
 876 }
 877
 878 static int ntfs_writepages(struct address_space *mapping,
 879                            struct writeback_control *wbc)
 880 {
 881         struct inode *inode = mapping->host;
 882
 883         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 884                 return -EIO;
 885
 886         if (is_resident(ntfs_i(inode)))
 887                 return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
 888                                          mapping);
 889         return mpage_writepages(mapping, wbc, ntfs_get_block);
 890 }
 891
 892 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
 893                                       struct buffer_head *bh_result, int create)
 894 {
 895         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 896                                   bh_result, create, GET_BLOCK_WRITE_BEGIN);
 897 }
 898
 899 int ntfs_write_begin(struct file *file, struct address_space *mapping,
 900                      loff_t pos, u32 len, struct page **pagep, void **fsdata)
 901 {
 902         int err;
 903         struct inode *inode = mapping->host;
 904         struct ntfs_inode *ni = ntfs_i(inode);
 905
 906         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 907                 return -EIO;
 908
 909         *pagep = NULL;
 910         if (is_resident(ni)) {
 911                 struct page *page =
 912                         grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT);
 913
 914                 if (!page) {
 915                         err = -ENOMEM;
 916                         goto out;
 917                 }
 918
 919                 ni_lock(ni);
 920                 err = attr_data_read_resident(ni, page);
 921                 ni_unlock(ni);
 922
 923                 if (!err) {
 924                         *pagep = page;
 925                         goto out;
 926                 }
 927                 unlock_page(page);
 928                 put_page(page);
 929
 930                 if (err != E_NTFS_NONRESIDENT)
 931                         goto out;
 932         }
 933
 934         err = block_write_begin(mapping, pos, len, pagep,
 935                                 ntfs_get_block_write_begin);
 936
 937 out:
 938         return err;
 939 }
 940
 941 /*
 942  * ntfs_write_end - Address_space_operations::write_end.
 943  */
 944 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
 945                    u32 len, u32 copied, struct page *page, void *fsdata)
 946 {
 947         struct inode *inode = mapping->host;
 948         struct ntfs_inode *ni = ntfs_i(inode);
 949         u64 valid = ni->i_valid;
 950         bool dirty = false;
 951         int err;
 952
 953         if (is_resident(ni)) {
 954                 ni_lock(ni);
 955                 err = attr_data_write_resident(ni, page);
 956                 ni_unlock(ni);
 957                 if (!err) {
 958                         dirty = true;
 959                         /* Clear any buffers in page. */
 960                         if (page_has_buffers(page)) {
 961                                 struct buffer_head *head, *bh;
 962
 963                                 bh = head = page_buffers(page);
 964                                 do {
 965                                         clear_buffer_dirty(bh);
 966                                         clear_buffer_mapped(bh);
 967                                         set_buffer_uptodate(bh);
 968                                 } while (head != (bh = bh->b_this_page));
 969                         }
 970                         SetPageUptodate(page);
 971                         err = copied;
 972                 }
 973                 unlock_page(page);
 974                 put_page(page);
 975         } else {
 976                 err = generic_write_end(file, mapping, pos, len, copied, page,
 977                                         fsdata);
 978         }
 979
 980         if (err >= 0) {
 981                 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
 982                         inode_set_mtime_to_ts(inode,
 983                                               inode_set_ctime_current(inode));
 984                         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 985                         dirty = true;
 986                 }
 987
 988                 if (valid != ni->i_valid) {
 989                         /* ni->i_valid is changed in ntfs_get_block_vbo. */
 990                         dirty = true;
 991                 }
 992
 993                 if (pos + err > inode->i_size) {
 994                         i_size_write(inode, pos + err);
 995                         dirty = true;
 996                 }
 997
 998                 if (dirty)
 999                         mark_inode_dirty(inode);
1000         }
1001
1002         return err;
1003 }
1004
1005 int reset_log_file(struct inode *inode)
1006 {
1007         int err;
1008         loff_t pos = 0;
1009         u32 log_size = inode->i_size;
1010         struct address_space *mapping = inode->i_mapping;
1011
1012         for (;;) {
1013                 u32 len;
1014                 void *kaddr;
1015                 struct page *page;
1016
1017                 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
1018
1019                 err = block_write_begin(mapping, pos, len, &page,
1020                                         ntfs_get_block_write_begin);
1021                 if (err)
1022                         goto out;
1023
1024                 kaddr = kmap_atomic(page);
1025                 memset(kaddr, -1, len);
1026                 kunmap_atomic(kaddr);
1027                 flush_dcache_page(page);
1028
1029                 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
1030                 if (err < 0)
1031                         goto out;
1032                 pos += len;
1033
1034                 if (pos >= log_size)
1035                         break;
1036                 balance_dirty_pages_ratelimited(mapping);
1037         }
1038 out:
1039         mark_inode_dirty_sync(inode);
1040
1041         return err;
1042 }
1043
1044 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1045 {
1046         return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1047 }
1048
1049 int ntfs_sync_inode(struct inode *inode)
1050 {
1051         return _ni_write_inode(inode, 1);
1052 }
1053
1054 /*
1055  * writeback_inode - Helper function for ntfs_flush_inodes().
1056  *
1057  * This writes both the inode and the file data blocks, waiting
1058  * for in flight data blocks before the start of the call.  It
1059  * does not wait for any io started during the call.
1060  */
1061 static int writeback_inode(struct inode *inode)
1062 {
1063         int ret = sync_inode_metadata(inode, 0);
1064
1065         if (!ret)
1066                 ret = filemap_fdatawrite(inode->i_mapping);
1067         return ret;
1068 }
1069
1070 /*
1071  * ntfs_flush_inodes
1072  *
1073  * Write data and metadata corresponding to i1 and i2.  The io is
1074  * started but we do not wait for any of it to finish.
1075  *
1076  * filemap_flush() is used for the block device, so if there is a dirty
1077  * page for a block already in flight, we will not wait and start the
1078  * io over again.
1079  */
1080 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1081                       struct inode *i2)
1082 {
1083         int ret = 0;
1084
1085         if (i1)
1086                 ret = writeback_inode(i1);
1087         if (!ret && i2)
1088                 ret = writeback_inode(i2);
1089         if (!ret)
1090                 ret = sync_blockdev_nowait(sb->s_bdev);
1091         return ret;
1092 }
1093
1094 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1095 {
1096         pgoff_t idx;
1097
1098         /* Write non resident data. */
1099         for (idx = 0; bytes; idx++) {
1100                 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1101                 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1102
1103                 if (IS_ERR(page))
1104                         return PTR_ERR(page);
1105
1106                 lock_page(page);
1107                 WARN_ON(!PageUptodate(page));
1108                 ClearPageUptodate(page);
1109
1110                 memcpy(page_address(page), data, op);
1111
1112                 flush_dcache_page(page);
1113                 SetPageUptodate(page);
1114                 unlock_page(page);
1115
1116                 ntfs_unmap_page(page);
1117
1118                 bytes -= op;
1119                 data = Add2Ptr(data, PAGE_SIZE);
1120         }
1121         return 0;
1122 }
1123
1124 /*
1125  * ntfs_reparse_bytes
1126  *
1127  * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1128  * for unicode string of @uni_len length.
1129  */
1130 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1131 {
1132         /* Header + unicode string + decorated unicode string. */
1133         return sizeof(short) * (2 * uni_len + 4) +
1134                offsetof(struct REPARSE_DATA_BUFFER,
1135                         SymbolicLinkReparseBuffer.PathBuffer);
1136 }
1137
1138 static struct REPARSE_DATA_BUFFER *
1139 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1140                            u32 size, u16 *nsize)
1141 {
1142         int i, err;
1143         struct REPARSE_DATA_BUFFER *rp;
1144         __le16 *rp_name;
1145         typeof(rp->SymbolicLinkReparseBuffer) *rs;
1146
1147         rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1148         if (!rp)
1149                 return ERR_PTR(-ENOMEM);
1150
1151         rs = &rp->SymbolicLinkReparseBuffer;
1152         rp_name = rs->PathBuffer;
1153
1154         /* Convert link name to UTF-16. */
1155         err = ntfs_nls_to_utf16(sbi, symname, size,
1156                                 (struct cpu_str *)(rp_name - 1), 2 * size,
1157                                 UTF16_LITTLE_ENDIAN);
1158         if (err < 0)
1159                 goto out;
1160
1161         /* err = the length of unicode name of symlink. */
1162         *nsize = ntfs_reparse_bytes(err);
1163
1164         if (*nsize > sbi->reparse.max_size) {
1165                 err = -EFBIG;
1166                 goto out;
1167         }
1168
1169         /* Translate Linux '/' into Windows '\'. */
1170         for (i = 0; i < err; i++) {
1171                 if (rp_name[i] == cpu_to_le16('/'))
1172                         rp_name[i] = cpu_to_le16('\\');
1173         }
1174
1175         rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1176         rp->ReparseDataLength =
1177                 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1178                                               SymbolicLinkReparseBuffer));
1179
1180         /* PrintName + SubstituteName. */
1181         rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1182         rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1183         rs->PrintNameLength = rs->SubstituteNameOffset;
1184
1185         /*
1186          * TODO: Use relative path if possible to allow Windows to
1187          * parse this path.
1188          * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1189          */
1190         rs->Flags = 0;
1191
1192         memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1193
1194         /* Decorate SubstituteName. */
1195         rp_name += err;
1196         rp_name[0] = cpu_to_le16('\\');
1197         rp_name[1] = cpu_to_le16('?');
1198         rp_name[2] = cpu_to_le16('?');
1199         rp_name[3] = cpu_to_le16('\\');
1200
1201         return rp;
1202 out:
1203         kfree(rp);
1204         return ERR_PTR(err);
1205 }
1206
1207 /*
1208  * ntfs_create_inode
1209  *
1210  * Helper function for:
1211  * - ntfs_create
1212  * - ntfs_mknod
1213  * - ntfs_symlink
1214  * - ntfs_mkdir
1215  * - ntfs_atomic_open
1216  *
1217  * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1218  */
1219 struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1220                                 struct dentry *dentry,
1221                                 const struct cpu_str *uni, umode_t mode,
1222                                 dev_t dev, const char *symname, u32 size,
1223                                 struct ntfs_fnd *fnd)
1224 {
1225         int err;
1226         struct super_block *sb = dir->i_sb;
1227         struct ntfs_sb_info *sbi = sb->s_fs_info;
1228         const struct qstr *name = &dentry->d_name;
1229         CLST ino = 0;
1230         struct ntfs_inode *dir_ni = ntfs_i(dir);
1231         struct ntfs_inode *ni = NULL;
1232         struct inode *inode = NULL;
1233         struct ATTRIB *attr;
1234         struct ATTR_STD_INFO5 *std5;
1235         struct ATTR_FILE_NAME *fname;
1236         struct MFT_REC *rec;
1237         u32 asize, dsize, sd_size;
1238         enum FILE_ATTRIBUTE fa;
1239         __le32 security_id = SECURITY_ID_INVALID;
1240         CLST vcn;
1241         const void *sd;
1242         u16 t16, nsize = 0, aid = 0;
1243         struct INDEX_ROOT *root, *dir_root;
1244         struct NTFS_DE *e, *new_de = NULL;
1245         struct REPARSE_DATA_BUFFER *rp = NULL;
1246         bool rp_inserted = false;
1247
1248         if (!fnd)
1249                 ni_lock_dir(dir_ni);
1250
1251         dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1252         if (!dir_root) {
1253                 err = -EINVAL;
1254                 goto out1;
1255         }
1256
1257         if (S_ISDIR(mode)) {
1258                 /* Use parent's directory attributes. */
1259                 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1260                      FILE_ATTRIBUTE_ARCHIVE;
1261                 /*
1262                  * By default child directory inherits parent attributes.
1263                  * Root directory is hidden + system.
1264                  * Make an exception for children in root.
1265                  */
1266                 if (dir->i_ino == MFT_REC_ROOT)
1267                         fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1268         } else if (S_ISLNK(mode)) {
1269                 /* It is good idea that link should be the same type (file/dir) as target */
1270                 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1271
1272                 /*
1273                  * Linux: there are dir/file/symlink and so on.
1274                  * NTFS: symlinks are "dir + reparse" or "file + reparse"
1275                  * It is good idea to create:
1276                  * dir + reparse if 'symname' points to directory
1277                  * or
1278                  * file + reparse if 'symname' points to file
1279                  * Unfortunately kern_path hangs if symname contains 'dir'.
1280                  */
1281
1282                 /*
1283                  *      struct path path;
1284                  *
1285                  *      if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1286                  *              struct inode *target = d_inode(path.dentry);
1287                  *
1288                  *              if (S_ISDIR(target->i_mode))
1289                  *                      fa |= FILE_ATTRIBUTE_DIRECTORY;
1290                  *              // if ( target->i_sb == sb ){
1291                  *              //      use relative path?
1292                  *              // }
1293                  *              path_put(&path);
1294                  *      }
1295                  */
1296         } else if (S_ISREG(mode)) {
1297                 if (sbi->options->sparse) {
1298                         /* Sparsed regular file, cause option 'sparse'. */
1299                         fa = FILE_ATTRIBUTE_SPARSE_FILE |
1300                              FILE_ATTRIBUTE_ARCHIVE;
1301                 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1302                         /* Compressed regular file, if parent is compressed. */
1303                         fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1304                 } else {
1305                         /* Regular file, default attributes. */
1306                         fa = FILE_ATTRIBUTE_ARCHIVE;
1307                 }
1308         } else {
1309                 fa = FILE_ATTRIBUTE_ARCHIVE;
1310         }
1311
1312         /* If option "hide_dot_files" then set hidden attribute for dot files. */
1313         if (sbi->options->hide_dot_files && name->name[0] == '.')
1314                 fa |= FILE_ATTRIBUTE_HIDDEN;
1315
1316         if (!(mode & 0222))
1317                 fa |= FILE_ATTRIBUTE_READONLY;
1318
1319         /* Allocate PATH_MAX bytes. */
1320         new_de = __getname();
1321         if (!new_de) {
1322                 err = -ENOMEM;
1323                 goto out1;
1324         }
1325
1326         if (unlikely(ntfs3_forced_shutdown(sb))) {
1327                 err = -EIO;
1328                 goto out2;
1329         }
1330
1331         /* Mark rw ntfs as dirty. it will be cleared at umount. */
1332         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1333
1334         /* Step 1: allocate and fill new mft record. */
1335         err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1336         if (err)
1337                 goto out2;
1338
1339         ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1340         if (IS_ERR(ni)) {
1341                 err = PTR_ERR(ni);
1342                 ni = NULL;
1343                 goto out3;
1344         }
1345         inode = &ni->vfs_inode;
1346         inode_init_owner(idmap, inode, dir, mode);
1347         mode = inode->i_mode;
1348
1349         ni->i_crtime = current_time(inode);
1350
1351         rec = ni->mi.mrec;
1352         rec->hard_links = cpu_to_le16(1);
1353         attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1354
1355         /* Get default security id. */
1356         sd = s_default_security;
1357         sd_size = sizeof(s_default_security);
1358
1359         if (is_ntfs3(sbi)) {
1360                 security_id = dir_ni->std_security_id;
1361                 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1362                         security_id = sbi->security.def_security_id;
1363
1364                         if (security_id == SECURITY_ID_INVALID &&
1365                             !ntfs_insert_security(sbi, sd, sd_size,
1366                                                   &security_id, NULL))
1367                                 sbi->security.def_security_id = security_id;
1368                 }
1369         }
1370
1371         /* Insert standard info. */
1372         std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1373
1374         if (security_id == SECURITY_ID_INVALID) {
1375                 dsize = sizeof(struct ATTR_STD_INFO);
1376         } else {
1377                 dsize = sizeof(struct ATTR_STD_INFO5);
1378                 std5->security_id = security_id;
1379                 ni->std_security_id = security_id;
1380         }
1381         asize = SIZEOF_RESIDENT + dsize;
1382
1383         attr->type = ATTR_STD;
1384         attr->size = cpu_to_le32(asize);
1385         attr->id = cpu_to_le16(aid++);
1386         attr->res.data_off = SIZEOF_RESIDENT_LE;
1387         attr->res.data_size = cpu_to_le32(dsize);
1388
1389         std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1390                 kernel2nt(&ni->i_crtime);
1391
1392         std5->fa = ni->std_fa = fa;
1393
1394         attr = Add2Ptr(attr, asize);
1395
1396         /* Insert file name. */
1397         err = fill_name_de(sbi, new_de, name, uni);
1398         if (err)
1399                 goto out4;
1400
1401         mi_get_ref(&ni->mi, &new_de->ref);
1402
1403         fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1404
1405         if (sbi->options->windows_names &&
1406             !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1407                 err = -EINVAL;
1408                 goto out4;
1409         }
1410
1411         mi_get_ref(&dir_ni->mi, &fname->home);
1412         fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1413                 fname->dup.a_time = std5->cr_time;
1414         fname->dup.alloc_size = fname->dup.data_size = 0;
1415         fname->dup.fa = std5->fa;
1416         fname->dup.ea_size = fname->dup.reparse = 0;
1417
1418         dsize = le16_to_cpu(new_de->key_size);
1419         asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1420
1421         attr->type = ATTR_NAME;
1422         attr->size = cpu_to_le32(asize);
1423         attr->res.data_off = SIZEOF_RESIDENT_LE;
1424         attr->res.flags = RESIDENT_FLAG_INDEXED;
1425         attr->id = cpu_to_le16(aid++);
1426         attr->res.data_size = cpu_to_le32(dsize);
1427         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1428
1429         attr = Add2Ptr(attr, asize);
1430
1431         if (security_id == SECURITY_ID_INVALID) {
1432                 /* Insert security attribute. */
1433                 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1434
1435                 attr->type = ATTR_SECURE;
1436                 attr->size = cpu_to_le32(asize);
1437                 attr->id = cpu_to_le16(aid++);
1438                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1439                 attr->res.data_size = cpu_to_le32(sd_size);
1440                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1441
1442                 attr = Add2Ptr(attr, asize);
1443         }
1444
1445         attr->id = cpu_to_le16(aid++);
1446         if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1447                 /*
1448                  * Regular directory or symlink to directory.
1449                  * Create root attribute.
1450                  */
1451                 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1452                 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1453
1454                 attr->type = ATTR_ROOT;
1455                 attr->size = cpu_to_le32(asize);
1456
1457                 attr->name_len = ARRAY_SIZE(I30_NAME);
1458                 attr->name_off = SIZEOF_RESIDENT_LE;
1459                 attr->res.data_off =
1460                         cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1461                 attr->res.data_size = cpu_to_le32(dsize);
1462                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1463                        sizeof(I30_NAME));
1464
1465                 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1466                 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1467                 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1468                 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1469                                               sizeof(struct NTFS_DE));
1470                 root->ihdr.total = root->ihdr.used;
1471
1472                 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1473                 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1474                 e->flags = NTFS_IE_LAST;
1475         } else if (S_ISLNK(mode)) {
1476                 /*
1477                  * Symlink to file.
1478                  * Create empty resident data attribute.
1479                  */
1480                 asize = SIZEOF_RESIDENT;
1481
1482                 /* Insert empty ATTR_DATA */
1483                 attr->type = ATTR_DATA;
1484                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1485                 attr->name_off = SIZEOF_RESIDENT_LE;
1486                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1487         } else if (S_ISREG(mode)) {
1488                 /*
1489                  * Regular file. Create empty non resident data attribute.
1490                  */
1491                 attr->type = ATTR_DATA;
1492                 attr->non_res = 1;
1493                 attr->nres.evcn = cpu_to_le64(-1ll);
1494                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1495                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1496                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1497                         attr->flags = ATTR_FLAG_SPARSED;
1498                         asize = SIZEOF_NONRESIDENT_EX + 8;
1499                 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1500                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1501                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1502                         attr->flags = ATTR_FLAG_COMPRESSED;
1503                         attr->nres.c_unit = COMPRESSION_UNIT;
1504                         asize = SIZEOF_NONRESIDENT_EX + 8;
1505                 } else {
1506                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1507                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1508                         asize = SIZEOF_NONRESIDENT + 8;
1509                 }
1510                 attr->nres.run_off = attr->name_off;
1511         } else {
1512                 /*
1513                  * Node. Create empty resident data attribute.
1514                  */
1515                 attr->type = ATTR_DATA;
1516                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1517                 attr->name_off = SIZEOF_RESIDENT_LE;
1518                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1519                         attr->flags = ATTR_FLAG_SPARSED;
1520                 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1521                         attr->flags = ATTR_FLAG_COMPRESSED;
1522                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1523                 asize = SIZEOF_RESIDENT;
1524                 ni->ni_flags |= NI_FLAG_RESIDENT;
1525         }
1526
1527         if (S_ISDIR(mode)) {
1528                 ni->ni_flags |= NI_FLAG_DIR;
1529                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1530                 if (err)
1531                         goto out4;
1532         } else if (S_ISLNK(mode)) {
1533                 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1534
1535                 if (IS_ERR(rp)) {
1536                         err = PTR_ERR(rp);
1537                         rp = NULL;
1538                         goto out4;
1539                 }
1540
1541                 /*
1542                  * Insert ATTR_REPARSE.
1543                  */
1544                 attr = Add2Ptr(attr, asize);
1545                 attr->type = ATTR_REPARSE;
1546                 attr->id = cpu_to_le16(aid++);
1547
1548                 /* Resident or non resident? */
1549                 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1550                 t16 = PtrOffset(rec, attr);
1551
1552                 /*
1553                  * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1554                  * It is good idea to keep extened attributes resident.
1555                  */
1556                 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1557                         CLST alen;
1558                         CLST clst = bytes_to_cluster(sbi, nsize);
1559
1560                         /* Bytes per runs. */
1561                         t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1562
1563                         attr->non_res = 1;
1564                         attr->nres.evcn = cpu_to_le64(clst - 1);
1565                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1566                         attr->nres.run_off = attr->name_off;
1567                         attr->nres.data_size = cpu_to_le64(nsize);
1568                         attr->nres.valid_size = attr->nres.data_size;
1569                         attr->nres.alloc_size =
1570                                 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1571
1572                         err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1573                                                      clst, NULL, ALLOCATE_DEF,
1574                                                      &alen, 0, NULL, NULL);
1575                         if (err)
1576                                 goto out5;
1577
1578                         err = run_pack(&ni->file.run, 0, clst,
1579                                        Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1580                                        &vcn);
1581                         if (err < 0)
1582                                 goto out5;
1583
1584                         if (vcn != clst) {
1585                                 err = -EINVAL;
1586                                 goto out5;
1587                         }
1588
1589                         asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1590                         /* Write non resident data. */
1591                         err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1592                                                 nsize, 0);
1593                         if (err)
1594                                 goto out5;
1595                 } else {
1596                         attr->res.data_off = SIZEOF_RESIDENT_LE;
1597                         attr->res.data_size = cpu_to_le32(nsize);
1598                         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1599                 }
1600                 /* Size of symlink equals the length of input string. */
1601                 inode->i_size = size;
1602
1603                 attr->size = cpu_to_le32(asize);
1604
1605                 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1606                                           &new_de->ref);
1607                 if (err)
1608                         goto out5;
1609
1610                 rp_inserted = true;
1611         }
1612
1613         attr = Add2Ptr(attr, asize);
1614         attr->type = ATTR_END;
1615
1616         rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1617         rec->next_attr_id = cpu_to_le16(aid);
1618
1619         inode->i_generation = le16_to_cpu(rec->seq);
1620
1621         if (S_ISDIR(mode)) {
1622                 inode->i_op = &ntfs_dir_inode_operations;
1623                 if (is_legacy_ntfs(inode->i_sb))
1624                         inode->i_fop = &ntfs_legacy_dir_operations;
1625                 else
1626                         inode->i_fop = &ntfs_dir_operations;
1627         } else if (S_ISLNK(mode)) {
1628                 inode->i_op = &ntfs_link_inode_operations;
1629                 inode->i_fop = NULL;
1630                 inode->i_mapping->a_ops = &ntfs_aops;
1631                 inode->i_size = size;
1632                 inode_nohighmem(inode);
1633         } else if (S_ISREG(mode)) {
1634                 inode->i_op = &ntfs_file_inode_operations;
1635                 if (is_legacy_ntfs(inode->i_sb))
1636                         inode->i_fop = &ntfs_legacy_file_operations;
1637                 else
1638                         inode->i_fop = &ntfs_file_operations;
1639                 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1640                                                               &ntfs_aops;
1641                 init_rwsem(&ni->file.run_lock);
1642         } else {
1643                 inode->i_op = &ntfs_special_inode_operations;
1644                 init_special_inode(inode, mode, dev);
1645         }
1646
1647 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1648         if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1649                 err = ntfs_init_acl(idmap, inode, dir);
1650                 if (err)
1651                         goto out5;
1652         } else
1653 #endif
1654         {
1655                 inode->i_flags |= S_NOSEC;
1656         }
1657
1658         /*
1659          * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1660          * The packed size of extended attribute is stored in direntry too.
1661          * 'fname' here points to inside new_de.
1662          */
1663         ntfs_save_wsl_perm(inode, &fname->dup.ea_size);
1664
1665         /*
1666          * update ea_size in file_name attribute too.
1667          * Use ni_find_attr cause layout of MFT record may be changed
1668          * in ntfs_init_acl and ntfs_save_wsl_perm.
1669          */
1670         attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
1671         if (attr) {
1672                 struct ATTR_FILE_NAME *fn;
1673
1674                 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1675                 if (fn)
1676                         fn->dup.ea_size = fname->dup.ea_size;
1677         }
1678
1679         /* We do not need to update parent directory later */
1680         ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1681
1682         /* Step 2: Add new name in index. */
1683         err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1684         if (err)
1685                 goto out6;
1686
1687         /*
1688          * Call 'd_instantiate' after inode->i_op is set
1689          * but before finish_open.
1690          */
1691         d_instantiate(dentry, inode);
1692
1693         /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1694         inode_set_atime_to_ts(inode, ni->i_crtime);
1695         inode_set_ctime_to_ts(inode, ni->i_crtime);
1696         inode_set_mtime_to_ts(inode, ni->i_crtime);
1697         inode_set_mtime_to_ts(dir, ni->i_crtime);
1698         inode_set_ctime_to_ts(dir, ni->i_crtime);
1699
1700         mark_inode_dirty(dir);
1701         mark_inode_dirty(inode);
1702
1703         /* Normal exit. */
1704         goto out2;
1705
1706 out6:
1707         if (rp_inserted)
1708                 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1709
1710 out5:
1711         if (!S_ISDIR(mode))
1712                 run_deallocate(sbi, &ni->file.run, false);
1713
1714 out4:
1715         clear_rec_inuse(rec);
1716         clear_nlink(inode);
1717         ni->mi.dirty = false;
1718         discard_new_inode(inode);
1719 out3:
1720         ntfs_mark_rec_free(sbi, ino, false);
1721
1722 out2:
1723         __putname(new_de);
1724         kfree(rp);
1725
1726 out1:
1727         if (!fnd)
1728                 ni_unlock(dir_ni);
1729
1730         if (err)
1731                 return ERR_PTR(err);
1732
1733         unlock_new_inode(inode);
1734
1735         return inode;
1736 }
1737
1738 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1739 {
1740         int err;
1741         struct ntfs_inode *ni = ntfs_i(inode);
1742         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1743         struct NTFS_DE *de;
1744
1745         /* Allocate PATH_MAX bytes. */
1746         de = __getname();
1747         if (!de)
1748                 return -ENOMEM;
1749
1750         /* Mark rw ntfs as dirty. It will be cleared at umount. */
1751         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1752
1753         /* Construct 'de'. */
1754         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1755         if (err)
1756                 goto out;
1757
1758         err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1759 out:
1760         __putname(de);
1761         return err;
1762 }
1763
1764 /*
1765  * ntfs_unlink_inode
1766  *
1767  * inode_operations::unlink
1768  * inode_operations::rmdir
1769  */
1770 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1771 {
1772         int err;
1773         struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1774         struct inode *inode = d_inode(dentry);
1775         struct ntfs_inode *ni = ntfs_i(inode);
1776         struct ntfs_inode *dir_ni = ntfs_i(dir);
1777         struct NTFS_DE *de, *de2 = NULL;
1778         int undo_remove;
1779
1780         if (ntfs_is_meta_file(sbi, ni->mi.rno))
1781                 return -EINVAL;
1782
1783         /* Allocate PATH_MAX bytes. */
1784         de = __getname();
1785         if (!de)
1786                 return -ENOMEM;
1787
1788         ni_lock(ni);
1789
1790         if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1791                 err = -ENOTEMPTY;
1792                 goto out;
1793         }
1794
1795         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1796         if (err < 0)
1797                 goto out;
1798
1799         undo_remove = 0;
1800         err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1801
1802         if (!err) {
1803                 drop_nlink(inode);
1804                 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1805                 mark_inode_dirty(dir);
1806                 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1807                 if (inode->i_nlink)
1808                         mark_inode_dirty(inode);
1809         } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1810                 _ntfs_bad_inode(inode);
1811         } else {
1812                 if (ni_is_dirty(dir))
1813                         mark_inode_dirty(dir);
1814                 if (ni_is_dirty(inode))
1815                         mark_inode_dirty(inode);
1816         }
1817
1818 out:
1819         ni_unlock(ni);
1820         __putname(de);
1821         return err;
1822 }
1823
1824 void ntfs_evict_inode(struct inode *inode)
1825 {
1826         truncate_inode_pages_final(&inode->i_data);
1827
1828         invalidate_inode_buffers(inode);
1829         clear_inode(inode);
1830
1831         ni_clear(ntfs_i(inode));
1832 }
1833
1834 /*
1835  * ntfs_translate_junction
1836  *
1837  * Translate a Windows junction target to the Linux equivalent.
1838  * On junctions, targets are always absolute (they include the drive
1839  * letter). We have no way of knowing if the target is for the current
1840  * mounted device or not so we just assume it is.
1841  */
1842 static int ntfs_translate_junction(const struct super_block *sb,
1843                                    const struct dentry *link_de, char *target,
1844                                    int target_len, int target_max)
1845 {
1846         int tl_len, err = target_len;
1847         char *link_path_buffer = NULL, *link_path;
1848         char *translated = NULL;
1849         char *target_start;
1850         int copy_len;
1851
1852         link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1853         if (!link_path_buffer) {
1854                 err = -ENOMEM;
1855                 goto out;
1856         }
1857         /* Get link path, relative to mount point */
1858         link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1859         if (IS_ERR(link_path)) {
1860                 ntfs_err(sb, "Error getting link path");
1861                 err = -EINVAL;
1862                 goto out;
1863         }
1864
1865         translated = kmalloc(PATH_MAX, GFP_NOFS);
1866         if (!translated) {
1867                 err = -ENOMEM;
1868                 goto out;
1869         }
1870
1871         /* Make translated path a relative path to mount point */
1872         strcpy(translated, "./");
1873         ++link_path; /* Skip leading / */
1874         for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1875                 if (*link_path == '/') {
1876                         if (PATH_MAX - tl_len < sizeof("../")) {
1877                                 ntfs_err(sb,
1878                                          "Link path %s has too many components",
1879                                          link_path);
1880                                 err = -EINVAL;
1881                                 goto out;
1882                         }
1883                         strcpy(translated + tl_len, "../");
1884                         tl_len += sizeof("../") - 1;
1885                 }
1886         }
1887
1888         /* Skip drive letter */
1889         target_start = target;
1890         while (*target_start && *target_start != ':')
1891                 ++target_start;
1892
1893         if (!*target_start) {
1894                 ntfs_err(sb, "Link target (%s) missing drive separator",
1895                          target);
1896                 err = -EINVAL;
1897                 goto out;
1898         }
1899
1900         /* Skip drive separator and leading /, if exists */
1901         target_start += 1 + (target_start[1] == '/');
1902         copy_len = target_len - (target_start - target);
1903
1904         if (PATH_MAX - tl_len <= copy_len) {
1905                 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1906                          target_start, PATH_MAX - tl_len, copy_len);
1907                 err = -EINVAL;
1908                 goto out;
1909         }
1910
1911         /* translated path has a trailing / and target_start does not */
1912         strcpy(translated + tl_len, target_start);
1913         tl_len += copy_len;
1914         if (target_max <= tl_len) {
1915                 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1916                          translated, target_max, tl_len);
1917                 err = -EINVAL;
1918                 goto out;
1919         }
1920         strcpy(target, translated);
1921         err = tl_len;
1922
1923 out:
1924         kfree(link_path_buffer);
1925         kfree(translated);
1926         return err;
1927 }
1928
1929 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1930                                       struct inode *inode, char *buffer,
1931                                       int buflen)
1932 {
1933         int i, err = -EINVAL;
1934         struct ntfs_inode *ni = ntfs_i(inode);
1935         struct super_block *sb = inode->i_sb;
1936         struct ntfs_sb_info *sbi = sb->s_fs_info;
1937         u64 size;
1938         u16 ulen = 0;
1939         void *to_free = NULL;
1940         struct REPARSE_DATA_BUFFER *rp;
1941         const __le16 *uname;
1942         struct ATTRIB *attr;
1943
1944         /* Reparse data present. Try to parse it. */
1945         static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1946         static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1947
1948         *buffer = 0;
1949
1950         attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1951         if (!attr)
1952                 goto out;
1953
1954         if (!attr->non_res) {
1955                 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1956                 if (!rp)
1957                         goto out;
1958                 size = le32_to_cpu(attr->res.data_size);
1959         } else {
1960                 size = le64_to_cpu(attr->nres.data_size);
1961                 rp = NULL;
1962         }
1963
1964         if (size > sbi->reparse.max_size || size <= sizeof(u32))
1965                 goto out;
1966
1967         if (!rp) {
1968                 rp = kmalloc(size, GFP_NOFS);
1969                 if (!rp) {
1970                         err = -ENOMEM;
1971                         goto out;
1972                 }
1973                 to_free = rp;
1974                 /* Read into temporal buffer. */
1975                 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1976                 if (err)
1977                         goto out;
1978         }
1979
1980         /* Microsoft Tag. */
1981         switch (rp->ReparseTag) {
1982         case IO_REPARSE_TAG_MOUNT_POINT:
1983                 /* Mount points and junctions. */
1984                 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1985                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1986                                      MountPointReparseBuffer.PathBuffer))
1987                         goto out;
1988                 uname = Add2Ptr(rp,
1989                                 offsetof(struct REPARSE_DATA_BUFFER,
1990                                          MountPointReparseBuffer.PathBuffer) +
1991                                         le16_to_cpu(rp->MountPointReparseBuffer
1992                                                             .PrintNameOffset));
1993                 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1994                 break;
1995
1996         case IO_REPARSE_TAG_SYMLINK:
1997                 /* FolderSymbolicLink */
1998                 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1999                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
2000                                      SymbolicLinkReparseBuffer.PathBuffer))
2001                         goto out;
2002                 uname = Add2Ptr(
2003                         rp, offsetof(struct REPARSE_DATA_BUFFER,
2004                                      SymbolicLinkReparseBuffer.PathBuffer) +
2005                                     le16_to_cpu(rp->SymbolicLinkReparseBuffer
2006                                                         .PrintNameOffset));
2007                 ulen = le16_to_cpu(
2008                         rp->SymbolicLinkReparseBuffer.PrintNameLength);
2009                 break;
2010
2011         case IO_REPARSE_TAG_CLOUD:
2012         case IO_REPARSE_TAG_CLOUD_1:
2013         case IO_REPARSE_TAG_CLOUD_2:
2014         case IO_REPARSE_TAG_CLOUD_3:
2015         case IO_REPARSE_TAG_CLOUD_4:
2016         case IO_REPARSE_TAG_CLOUD_5:
2017         case IO_REPARSE_TAG_CLOUD_6:
2018         case IO_REPARSE_TAG_CLOUD_7:
2019         case IO_REPARSE_TAG_CLOUD_8:
2020         case IO_REPARSE_TAG_CLOUD_9:
2021         case IO_REPARSE_TAG_CLOUD_A:
2022         case IO_REPARSE_TAG_CLOUD_B:
2023         case IO_REPARSE_TAG_CLOUD_C:
2024         case IO_REPARSE_TAG_CLOUD_D:
2025         case IO_REPARSE_TAG_CLOUD_E:
2026         case IO_REPARSE_TAG_CLOUD_F:
2027                 err = sizeof("OneDrive") - 1;
2028                 if (err > buflen)
2029                         err = buflen;
2030                 memcpy(buffer, "OneDrive", err);
2031                 goto out;
2032
2033         default:
2034                 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2035                         /* Unknown Microsoft Tag. */
2036                         goto out;
2037                 }
2038                 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2039                     size <= sizeof(struct REPARSE_POINT)) {
2040                         goto out;
2041                 }
2042
2043                 /* Users tag. */
2044                 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2045                 ulen = le16_to_cpu(rp->ReparseDataLength) -
2046                        sizeof(struct REPARSE_POINT);
2047         }
2048
2049         /* Convert nlen from bytes to UNICODE chars. */
2050         ulen >>= 1;
2051
2052         /* Check that name is available. */
2053         if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2054                 goto out;
2055
2056         /* If name is already zero terminated then truncate it now. */
2057         if (!uname[ulen - 1])
2058                 ulen -= 1;
2059
2060         err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2061
2062         if (err < 0)
2063                 goto out;
2064
2065         /* Translate Windows '\' into Linux '/'. */
2066         for (i = 0; i < err; i++) {
2067                 if (buffer[i] == '\\')
2068                         buffer[i] = '/';
2069         }
2070
2071         /* Always set last zero. */
2072         buffer[err] = 0;
2073
2074         /* If this is a junction, translate the link target. */
2075         if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2076                 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2077
2078 out:
2079         kfree(to_free);
2080         return err;
2081 }
2082
2083 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2084                                  struct delayed_call *done)
2085 {
2086         int err;
2087         char *ret;
2088
2089         if (!de)
2090                 return ERR_PTR(-ECHILD);
2091
2092         ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2093         if (!ret)
2094                 return ERR_PTR(-ENOMEM);
2095
2096         err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2097         if (err < 0) {
2098                 kfree(ret);
2099                 return ERR_PTR(err);
2100         }
2101
2102         set_delayed_call(done, kfree_link, ret);
2103
2104         return ret;
2105 }
2106
2107 // clang-format off
2108 const struct inode_operations ntfs_link_inode_operations = {
2109         .get_link       = ntfs_get_link,
2110         .setattr        = ntfs3_setattr,
2111         .listxattr      = ntfs_listxattr,
2112 };
2113
2114 const struct address_space_operations ntfs_aops = {
2115         .read_folio     = ntfs_read_folio,
2116         .readahead      = ntfs_readahead,
2117         .writepages     = ntfs_writepages,
2118         .write_begin    = ntfs_write_begin,
2119         .write_end      = ntfs_write_end,
2120         .direct_IO      = ntfs_direct_IO,
2121         .bmap           = ntfs_bmap,
2122         .dirty_folio    = block_dirty_folio,
2123         .migrate_folio  = buffer_migrate_folio,
2124         .invalidate_folio = block_invalidate_folio,
2125 };
2126
2127 const struct address_space_operations ntfs_aops_cmpr = {
2128         .read_folio     = ntfs_read_folio,
2129         .readahead      = ntfs_readahead,
2130 };
2131 // clang-format on