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, links = 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                 names += 1;
 204                 fname = Add2Ptr(attr, roff);
 205                 if (fname->type == FILE_NAME_DOS)
 206                         goto next_attr;
 207
 208                 links += 1;
 209                 if (name && name->len == fname->name_len &&
 210                     !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
 211                                         NULL, false))
 212                         is_match = true;
 213
 214                 goto next_attr;
 215
 216         case ATTR_DATA:
 217                 if (is_dir) {
 218                         /* Ignore data attribute in dir record. */
 219                         goto next_attr;
 220                 }
 221
 222                 if (ino == MFT_REC_BADCLUST && !attr->non_res)
 223                         goto next_attr;
 224
 225                 if (attr->name_len &&
 226                     ((ino != MFT_REC_BADCLUST || !attr->non_res ||
 227                       attr->name_len != ARRAY_SIZE(BAD_NAME) ||
 228                       memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
 229                      (ino != MFT_REC_SECURE || !attr->non_res ||
 230                       attr->name_len != ARRAY_SIZE(SDS_NAME) ||
 231                       memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
 232                         /* File contains stream attribute. Ignore it. */
 233                         goto next_attr;
 234                 }
 235
 236                 if (is_attr_sparsed(attr))
 237                         ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
 238                 else
 239                         ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
 240
 241                 if (is_attr_compressed(attr))
 242                         ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
 243                 else
 244                         ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
 245
 246                 if (is_attr_encrypted(attr))
 247                         ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
 248                 else
 249                         ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
 250
 251                 if (!attr->non_res) {
 252                         ni->i_valid = inode->i_size = rsize;
 253                         inode_set_bytes(inode, rsize);
 254                 }
 255
 256                 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
 257
 258                 if (!attr->non_res) {
 259                         ni->ni_flags |= NI_FLAG_RESIDENT;
 260                         goto next_attr;
 261                 }
 262
 263                 inode_set_bytes(inode, attr_ondisk_size(attr));
 264
 265                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 266                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 267                 if (!attr->nres.alloc_size)
 268                         goto next_attr;
 269
 270                 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
 271                                               &ni->file.run;
 272                 break;
 273
 274         case ATTR_ROOT:
 275                 if (attr->non_res)
 276                         goto out;
 277
 278                 root = Add2Ptr(attr, roff);
 279
 280                 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
 281                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 282                         goto next_attr;
 283
 284                 if (root->type != ATTR_NAME ||
 285                     root->rule != NTFS_COLLATION_TYPE_FILENAME)
 286                         goto out;
 287
 288                 if (!is_dir)
 289                         goto next_attr;
 290
 291                 is_root = true;
 292                 ni->ni_flags |= NI_FLAG_DIR;
 293
 294                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
 295                 if (err)
 296                         goto out;
 297
 298                 mode = sb->s_root ?
 299                                (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
 300                                (S_IFDIR | 0777);
 301                 goto next_attr;
 302
 303         case ATTR_ALLOC:
 304                 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
 305                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 306                         goto next_attr;
 307
 308                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 309                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 310                 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
 311
 312                 run = &ni->dir.alloc_run;
 313                 break;
 314
 315         case ATTR_BITMAP:
 316                 if (ino == MFT_REC_MFT) {
 317                         if (!attr->non_res)
 318                                 goto out;
 319 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
 320                         /* 0x20000000 = 2^32 / 8 */
 321                         if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
 322                                 goto out;
 323 #endif
 324                         run = &sbi->mft.bitmap.run;
 325                         break;
 326                 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
 327                            !memcmp(attr_name(attr), I30_NAME,
 328                                    sizeof(I30_NAME)) &&
 329                            attr->non_res) {
 330                         run = &ni->dir.bitmap_run;
 331                         break;
 332                 }
 333                 goto next_attr;
 334
 335         case ATTR_REPARSE:
 336                 if (attr->name_len)
 337                         goto next_attr;
 338
 339                 rp_fa = ni_parse_reparse(ni, attr, &rp);
 340                 switch (rp_fa) {
 341                 case REPARSE_LINK:
 342                         /*
 343                          * Normal symlink.
 344                          * Assume one unicode symbol == one utf8.
 345                          */
 346                         inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
 347                                                             .PrintNameLength) /
 348                                         sizeof(u16);
 349                         ni->i_valid = inode->i_size;
 350                         /* Clear directory bit. */
 351                         if (ni->ni_flags & NI_FLAG_DIR) {
 352                                 indx_clear(&ni->dir);
 353                                 memset(&ni->dir, 0, sizeof(ni->dir));
 354                                 ni->ni_flags &= ~NI_FLAG_DIR;
 355                         } else {
 356                                 run_close(&ni->file.run);
 357                         }
 358                         mode = S_IFLNK | 0777;
 359                         is_dir = false;
 360                         if (attr->non_res) {
 361                                 run = &ni->file.run;
 362                                 goto attr_unpack_run; // Double break.
 363                         }
 364                         break;
 365
 366                 case REPARSE_COMPRESSED:
 367                         break;
 368
 369                 case REPARSE_DEDUPLICATED:
 370                         break;
 371                 }
 372                 goto next_attr;
 373
 374         case ATTR_EA_INFO:
 375                 if (!attr->name_len &&
 376                     resident_data_ex(attr, sizeof(struct EA_INFO))) {
 377                         ni->ni_flags |= NI_FLAG_EA;
 378                         /*
 379                          * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
 380                          */
 381                         inode->i_mode = mode;
 382                         ntfs_get_wsl_perm(inode);
 383                         mode = inode->i_mode;
 384                 }
 385                 goto next_attr;
 386
 387         default:
 388                 goto next_attr;
 389         }
 390
 391 attr_unpack_run:
 392         roff = le16_to_cpu(attr->nres.run_off);
 393
 394         if (roff > asize) {
 395                 err = -EINVAL;
 396                 goto out;
 397         }
 398
 399         t64 = le64_to_cpu(attr->nres.svcn);
 400
 401         err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
 402                             t64, Add2Ptr(attr, roff), asize - roff);
 403         if (err < 0)
 404                 goto out;
 405         err = 0;
 406         goto next_attr;
 407
 408 end_enum:
 409
 410         if (!std5)
 411                 goto out;
 412
 413         if (!is_match && name) {
 414                 err = -ENOENT;
 415                 goto out;
 416         }
 417
 418         if (std5->fa & FILE_ATTRIBUTE_READONLY)
 419                 mode &= ~0222;
 420
 421         if (!names) {
 422                 err = -EINVAL;
 423                 goto out;
 424         }
 425
 426         if (names != le16_to_cpu(rec->hard_links)) {
 427                 /* Correct minor error on the fly. Do not mark inode as dirty. */
 428                 ntfs_inode_warn(inode, "Correct links count -> %u.", names);
 429                 rec->hard_links = cpu_to_le16(names);
 430                 ni->mi.dirty = true;
 431         }
 432
 433         set_nlink(inode, links);
 434
 435         if (S_ISDIR(mode)) {
 436                 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
 437
 438                 /*
 439                  * Dot and dot-dot should be included in count but was not
 440                  * included in enumeration.
 441                  * Usually a hard links to directories are disabled.
 442                  */
 443                 inode->i_op = &ntfs_dir_inode_operations;
 444                 if (is_legacy_ntfs(inode->i_sb))
 445                         inode->i_fop = &ntfs_legacy_dir_operations;
 446                 else
 447                         inode->i_fop = &ntfs_dir_operations;
 448                 ni->i_valid = 0;
 449         } else if (S_ISLNK(mode)) {
 450                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 451                 inode->i_op = &ntfs_link_inode_operations;
 452                 inode->i_fop = NULL;
 453                 inode_nohighmem(inode);
 454         } else if (S_ISREG(mode)) {
 455                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 456                 inode->i_op = &ntfs_file_inode_operations;
 457                 if (is_legacy_ntfs(inode->i_sb))
 458                         inode->i_fop = &ntfs_legacy_file_operations;
 459                 else
 460                         inode->i_fop = &ntfs_file_operations;
 461                 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
 462                                                               &ntfs_aops;
 463                 if (ino != MFT_REC_MFT)
 464                         init_rwsem(&ni->file.run_lock);
 465         } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
 466                    S_ISSOCK(mode)) {
 467                 inode->i_op = &ntfs_special_inode_operations;
 468                 init_special_inode(inode, mode, inode->i_rdev);
 469         } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
 470                    fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
 471                 /* Records in $Extend are not a files or general directories. */
 472                 inode->i_op = &ntfs_file_inode_operations;
 473         } else {
 474                 err = -EINVAL;
 475                 goto out;
 476         }
 477
 478         if ((sbi->options->sys_immutable &&
 479              (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
 480             !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
 481                 inode->i_flags |= S_IMMUTABLE;
 482         } else {
 483                 inode->i_flags &= ~S_IMMUTABLE;
 484         }
 485
 486         inode->i_mode = mode;
 487         if (!(ni->ni_flags & NI_FLAG_EA)) {
 488                 /* If no xattr then no security (stored in xattr). */
 489                 inode->i_flags |= S_NOSEC;
 490         }
 491
 492         if (ino == MFT_REC_MFT && !sb->s_root)
 493                 sbi->mft.ni = NULL;
 494
 495         unlock_new_inode(inode);
 496
 497         return inode;
 498
 499 out:
 500         if (ino == MFT_REC_MFT && !sb->s_root)
 501                 sbi->mft.ni = NULL;
 502
 503         iget_failed(inode);
 504         return ERR_PTR(err);
 505 }
 506
 507 /*
 508  * ntfs_test_inode
 509  *
 510  * Return: 1 if match.
 511  */
 512 static int ntfs_test_inode(struct inode *inode, void *data)
 513 {
 514         struct MFT_REF *ref = data;
 515
 516         return ino_get(ref) == inode->i_ino;
 517 }
 518
 519 static int ntfs_set_inode(struct inode *inode, void *data)
 520 {
 521         const struct MFT_REF *ref = data;
 522
 523         inode->i_ino = ino_get(ref);
 524         return 0;
 525 }
 526
 527 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
 528                          const struct cpu_str *name)
 529 {
 530         struct inode *inode;
 531
 532         inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
 533                              (void *)ref);
 534         if (unlikely(!inode))
 535                 return ERR_PTR(-ENOMEM);
 536
 537         /* If this is a freshly allocated inode, need to read it now. */
 538         if (inode->i_state & I_NEW)
 539                 inode = ntfs_read_mft(inode, name, ref);
 540         else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
 541                 /* Inode overlaps? */
 542                 _ntfs_bad_inode(inode);
 543         }
 544
 545         if (IS_ERR(inode) && name)
 546                 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
 547
 548         return inode;
 549 }
 550
 551 enum get_block_ctx {
 552         GET_BLOCK_GENERAL = 0,
 553         GET_BLOCK_WRITE_BEGIN = 1,
 554         GET_BLOCK_DIRECT_IO_R = 2,
 555         GET_BLOCK_DIRECT_IO_W = 3,
 556         GET_BLOCK_BMAP = 4,
 557 };
 558
 559 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
 560                                        struct buffer_head *bh, int create,
 561                                        enum get_block_ctx ctx)
 562 {
 563         struct super_block *sb = inode->i_sb;
 564         struct ntfs_sb_info *sbi = sb->s_fs_info;
 565         struct ntfs_inode *ni = ntfs_i(inode);
 566         struct folio *folio = bh->b_folio;
 567         u8 cluster_bits = sbi->cluster_bits;
 568         u32 block_size = sb->s_blocksize;
 569         u64 bytes, lbo, valid;
 570         u32 off;
 571         int err;
 572         CLST vcn, lcn, len;
 573         bool new;
 574
 575         /* Clear previous state. */
 576         clear_buffer_new(bh);
 577         clear_buffer_uptodate(bh);
 578
 579         if (is_resident(ni)) {
 580                 bh->b_blocknr = RESIDENT_LCN;
 581                 bh->b_size = block_size;
 582                 if (!folio) {
 583                         err = 0;
 584                 } else {
 585                         ni_lock(ni);
 586                         err = attr_data_read_resident(ni, &folio->page);
 587                         ni_unlock(ni);
 588
 589                         if (!err)
 590                                 set_buffer_uptodate(bh);
 591                 }
 592                 return err;
 593         }
 594
 595         vcn = vbo >> cluster_bits;
 596         off = vbo & sbi->cluster_mask;
 597         new = false;
 598
 599         err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
 600                                   create && sbi->cluster_size > PAGE_SIZE);
 601         if (err)
 602                 goto out;
 603
 604         if (!len)
 605                 return 0;
 606
 607         bytes = ((u64)len << cluster_bits) - off;
 608
 609         if (lcn == SPARSE_LCN) {
 610                 if (!create) {
 611                         if (bh->b_size > bytes)
 612                                 bh->b_size = bytes;
 613                         return 0;
 614                 }
 615                 WARN_ON(1);
 616         }
 617
 618         if (new)
 619                 set_buffer_new(bh);
 620
 621         lbo = ((u64)lcn << cluster_bits) + off;
 622
 623         set_buffer_mapped(bh);
 624         bh->b_bdev = sb->s_bdev;
 625         bh->b_blocknr = lbo >> sb->s_blocksize_bits;
 626
 627         valid = ni->i_valid;
 628
 629         if (ctx == GET_BLOCK_DIRECT_IO_W) {
 630                 /* ntfs_direct_IO will update ni->i_valid. */
 631                 if (vbo >= valid)
 632                         set_buffer_new(bh);
 633         } else if (create) {
 634                 /* Normal write. */
 635                 if (bytes > bh->b_size)
 636                         bytes = bh->b_size;
 637
 638                 if (vbo >= valid)
 639                         set_buffer_new(bh);
 640
 641                 if (vbo + bytes > valid) {
 642                         ni->i_valid = vbo + bytes;
 643                         mark_inode_dirty(inode);
 644                 }
 645         } else if (vbo >= valid) {
 646                 /* Read out of valid data. */
 647                 clear_buffer_mapped(bh);
 648         } else if (vbo + bytes <= valid) {
 649                 /* Normal read. */
 650         } else if (vbo + block_size <= valid) {
 651                 /* Normal short read. */
 652                 bytes = block_size;
 653         } else {
 654                 /*
 655                  * Read across valid size: vbo < valid && valid < vbo + block_size
 656                  */
 657                 bytes = block_size;
 658
 659                 if (folio) {
 660                         u32 voff = valid - vbo;
 661
 662                         bh->b_size = block_size;
 663                         off = vbo & (PAGE_SIZE - 1);
 664                         folio_set_bh(bh, folio, off);
 665
 666                         if (bh_read(bh, 0) < 0) {
 667                                 err = -EIO;
 668                                 goto out;
 669                         }
 670                         folio_zero_segment(folio, off + voff, off + block_size);
 671                 }
 672         }
 673
 674         if (bh->b_size > bytes)
 675                 bh->b_size = bytes;
 676
 677 #ifndef __LP64__
 678         if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
 679                 static_assert(sizeof(size_t) < sizeof(loff_t));
 680                 if (bytes > 0x40000000u)
 681                         bh->b_size = 0x40000000u;
 682         }
 683 #endif
 684
 685         return 0;
 686
 687 out:
 688         return err;
 689 }
 690
 691 int ntfs_get_block(struct inode *inode, sector_t vbn,
 692                    struct buffer_head *bh_result, int create)
 693 {
 694         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 695                                   bh_result, create, GET_BLOCK_GENERAL);
 696 }
 697
 698 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
 699                                struct buffer_head *bh_result, int create)
 700 {
 701         return ntfs_get_block_vbo(inode,
 702                                   (u64)vsn << inode->i_sb->s_blocksize_bits,
 703                                   bh_result, create, GET_BLOCK_BMAP);
 704 }
 705
 706 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
 707 {
 708         return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
 709 }
 710
 711 static int ntfs_read_folio(struct file *file, struct folio *folio)
 712 {
 713         struct page *page = &folio->page;
 714         int err;
 715         struct address_space *mapping = page->mapping;
 716         struct inode *inode = mapping->host;
 717         struct ntfs_inode *ni = ntfs_i(inode);
 718
 719         if (is_resident(ni)) {
 720                 ni_lock(ni);
 721                 err = attr_data_read_resident(ni, page);
 722                 ni_unlock(ni);
 723                 if (err != E_NTFS_NONRESIDENT) {
 724                         unlock_page(page);
 725                         return err;
 726                 }
 727         }
 728
 729         if (is_compressed(ni)) {
 730                 ni_lock(ni);
 731                 err = ni_readpage_cmpr(ni, page);
 732                 ni_unlock(ni);
 733                 return err;
 734         }
 735
 736         /* Normal + sparse files. */
 737         return mpage_read_folio(folio, ntfs_get_block);
 738 }
 739
 740 static void ntfs_readahead(struct readahead_control *rac)
 741 {
 742         struct address_space *mapping = rac->mapping;
 743         struct inode *inode = mapping->host;
 744         struct ntfs_inode *ni = ntfs_i(inode);
 745         u64 valid;
 746         loff_t pos;
 747
 748         if (is_resident(ni)) {
 749                 /* No readahead for resident. */
 750                 return;
 751         }
 752
 753         if (is_compressed(ni)) {
 754                 /* No readahead for compressed. */
 755                 return;
 756         }
 757
 758         valid = ni->i_valid;
 759         pos = readahead_pos(rac);
 760
 761         if (valid < i_size_read(inode) && pos <= valid &&
 762             valid < pos + readahead_length(rac)) {
 763                 /* Range cross 'valid'. Read it page by page. */
 764                 return;
 765         }
 766
 767         mpage_readahead(rac, ntfs_get_block);
 768 }
 769
 770 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
 771                                       struct buffer_head *bh_result, int create)
 772 {
 773         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 774                                   bh_result, create, GET_BLOCK_DIRECT_IO_R);
 775 }
 776
 777 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
 778                                       struct buffer_head *bh_result, int create)
 779 {
 780         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 781                                   bh_result, create, GET_BLOCK_DIRECT_IO_W);
 782 }
 783
 784 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 785 {
 786         struct file *file = iocb->ki_filp;
 787         struct address_space *mapping = file->f_mapping;
 788         struct inode *inode = mapping->host;
 789         struct ntfs_inode *ni = ntfs_i(inode);
 790         loff_t vbo = iocb->ki_pos;
 791         loff_t end;
 792         int wr = iov_iter_rw(iter) & WRITE;
 793         size_t iter_count = iov_iter_count(iter);
 794         loff_t valid;
 795         ssize_t ret;
 796
 797         if (is_resident(ni)) {
 798                 /* Switch to buffered write. */
 799                 ret = 0;
 800                 goto out;
 801         }
 802
 803         ret = blockdev_direct_IO(iocb, inode, iter,
 804                                  wr ? ntfs_get_block_direct_IO_W :
 805                                       ntfs_get_block_direct_IO_R);
 806
 807         if (ret > 0)
 808                 end = vbo + ret;
 809         else if (wr && ret == -EIOCBQUEUED)
 810                 end = vbo + iter_count;
 811         else
 812                 goto out;
 813
 814         valid = ni->i_valid;
 815         if (wr) {
 816                 if (end > valid && !S_ISBLK(inode->i_mode)) {
 817                         ni->i_valid = end;
 818                         mark_inode_dirty(inode);
 819                 }
 820         } else if (vbo < valid && valid < end) {
 821                 /* Fix page. */
 822                 iov_iter_revert(iter, end - valid);
 823                 iov_iter_zero(end - valid, iter);
 824         }
 825
 826 out:
 827         return ret;
 828 }
 829
 830 int ntfs_set_size(struct inode *inode, u64 new_size)
 831 {
 832         struct super_block *sb = inode->i_sb;
 833         struct ntfs_sb_info *sbi = sb->s_fs_info;
 834         struct ntfs_inode *ni = ntfs_i(inode);
 835         int err;
 836
 837         /* Check for maximum file size. */
 838         if (is_sparsed(ni) || is_compressed(ni)) {
 839                 if (new_size > sbi->maxbytes_sparse) {
 840                         err = -EFBIG;
 841                         goto out;
 842                 }
 843         } else if (new_size > sbi->maxbytes) {
 844                 err = -EFBIG;
 845                 goto out;
 846         }
 847
 848         ni_lock(ni);
 849         down_write(&ni->file.run_lock);
 850
 851         err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 852                             &ni->i_valid, true, NULL);
 853
 854         up_write(&ni->file.run_lock);
 855         ni_unlock(ni);
 856
 857         mark_inode_dirty(inode);
 858
 859 out:
 860         return err;
 861 }
 862
 863 static int ntfs_resident_writepage(struct folio *folio,
 864                                    struct writeback_control *wbc, void *data)
 865 {
 866         struct address_space *mapping = data;
 867         struct inode *inode = mapping->host;
 868         struct ntfs_inode *ni = ntfs_i(inode);
 869         int ret;
 870
 871         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 872                 return -EIO;
 873
 874         ni_lock(ni);
 875         ret = attr_data_write_resident(ni, &folio->page);
 876         ni_unlock(ni);
 877
 878         if (ret != E_NTFS_NONRESIDENT)
 879                 folio_unlock(folio);
 880         mapping_set_error(mapping, ret);
 881         return ret;
 882 }
 883
 884 static int ntfs_writepages(struct address_space *mapping,
 885                            struct writeback_control *wbc)
 886 {
 887         struct inode *inode = mapping->host;
 888
 889         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 890                 return -EIO;
 891
 892         if (is_resident(ntfs_i(inode)))
 893                 return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
 894                                          mapping);
 895         return mpage_writepages(mapping, wbc, ntfs_get_block);
 896 }
 897
 898 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
 899                                       struct buffer_head *bh_result, int create)
 900 {
 901         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 902                                   bh_result, create, GET_BLOCK_WRITE_BEGIN);
 903 }
 904
 905 int ntfs_write_begin(struct file *file, struct address_space *mapping,
 906                      loff_t pos, u32 len, struct page **pagep, void **fsdata)
 907 {
 908         int err;
 909         struct inode *inode = mapping->host;
 910         struct ntfs_inode *ni = ntfs_i(inode);
 911
 912         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 913                 return -EIO;
 914
 915         *pagep = NULL;
 916         if (is_resident(ni)) {
 917                 struct page *page =
 918                         grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT);
 919
 920                 if (!page) {
 921                         err = -ENOMEM;
 922                         goto out;
 923                 }
 924
 925                 ni_lock(ni);
 926                 err = attr_data_read_resident(ni, page);
 927                 ni_unlock(ni);
 928
 929                 if (!err) {
 930                         *pagep = page;
 931                         goto out;
 932                 }
 933                 unlock_page(page);
 934                 put_page(page);
 935
 936                 if (err != E_NTFS_NONRESIDENT)
 937                         goto out;
 938         }
 939
 940         err = block_write_begin(mapping, pos, len, pagep,
 941                                 ntfs_get_block_write_begin);
 942
 943 out:
 944         return err;
 945 }
 946
 947 /*
 948  * ntfs_write_end - Address_space_operations::write_end.
 949  */
 950 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
 951                    u32 len, u32 copied, struct page *page, void *fsdata)
 952 {
 953         struct inode *inode = mapping->host;
 954         struct ntfs_inode *ni = ntfs_i(inode);
 955         u64 valid = ni->i_valid;
 956         bool dirty = false;
 957         int err;
 958
 959         if (is_resident(ni)) {
 960                 ni_lock(ni);
 961                 err = attr_data_write_resident(ni, page);
 962                 ni_unlock(ni);
 963                 if (!err) {
 964                         dirty = true;
 965                         /* Clear any buffers in page. */
 966                         if (page_has_buffers(page)) {
 967                                 struct buffer_head *head, *bh;
 968
 969                                 bh = head = page_buffers(page);
 970                                 do {
 971                                         clear_buffer_dirty(bh);
 972                                         clear_buffer_mapped(bh);
 973                                         set_buffer_uptodate(bh);
 974                                 } while (head != (bh = bh->b_this_page));
 975                         }
 976                         SetPageUptodate(page);
 977                         err = copied;
 978                 }
 979                 unlock_page(page);
 980                 put_page(page);
 981         } else {
 982                 err = generic_write_end(file, mapping, pos, len, copied, page,
 983                                         fsdata);
 984         }
 985
 986         if (err >= 0) {
 987                 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
 988                         inode_set_mtime_to_ts(inode,
 989                                               inode_set_ctime_current(inode));
 990                         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 991                         dirty = true;
 992                 }
 993
 994                 if (valid != ni->i_valid) {
 995                         /* ni->i_valid is changed in ntfs_get_block_vbo. */
 996                         dirty = true;
 997                 }
 998
 999                 if (pos + err > inode->i_size) {
1000                         i_size_write(inode, pos + err);
1001                         dirty = true;
1002                 }
1003
1004                 if (dirty)
1005                         mark_inode_dirty(inode);
1006         }
1007
1008         return err;
1009 }
1010
1011 int reset_log_file(struct inode *inode)
1012 {
1013         int err;
1014         loff_t pos = 0;
1015         u32 log_size = inode->i_size;
1016         struct address_space *mapping = inode->i_mapping;
1017
1018         for (;;) {
1019                 u32 len;
1020                 void *kaddr;
1021                 struct page *page;
1022
1023                 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
1024
1025                 err = block_write_begin(mapping, pos, len, &page,
1026                                         ntfs_get_block_write_begin);
1027                 if (err)
1028                         goto out;
1029
1030                 kaddr = kmap_atomic(page);
1031                 memset(kaddr, -1, len);
1032                 kunmap_atomic(kaddr);
1033                 flush_dcache_page(page);
1034
1035                 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
1036                 if (err < 0)
1037                         goto out;
1038                 pos += len;
1039
1040                 if (pos >= log_size)
1041                         break;
1042                 balance_dirty_pages_ratelimited(mapping);
1043         }
1044 out:
1045         mark_inode_dirty_sync(inode);
1046
1047         return err;
1048 }
1049
1050 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1051 {
1052         return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1053 }
1054
1055 int ntfs_sync_inode(struct inode *inode)
1056 {
1057         return _ni_write_inode(inode, 1);
1058 }
1059
1060 /*
1061  * writeback_inode - Helper function for ntfs_flush_inodes().
1062  *
1063  * This writes both the inode and the file data blocks, waiting
1064  * for in flight data blocks before the start of the call.  It
1065  * does not wait for any io started during the call.
1066  */
1067 static int writeback_inode(struct inode *inode)
1068 {
1069         int ret = sync_inode_metadata(inode, 0);
1070
1071         if (!ret)
1072                 ret = filemap_fdatawrite(inode->i_mapping);
1073         return ret;
1074 }
1075
1076 /*
1077  * ntfs_flush_inodes
1078  *
1079  * Write data and metadata corresponding to i1 and i2.  The io is
1080  * started but we do not wait for any of it to finish.
1081  *
1082  * filemap_flush() is used for the block device, so if there is a dirty
1083  * page for a block already in flight, we will not wait and start the
1084  * io over again.
1085  */
1086 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1087                       struct inode *i2)
1088 {
1089         int ret = 0;
1090
1091         if (i1)
1092                 ret = writeback_inode(i1);
1093         if (!ret && i2)
1094                 ret = writeback_inode(i2);
1095         if (!ret)
1096                 ret = sync_blockdev_nowait(sb->s_bdev);
1097         return ret;
1098 }
1099
1100 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1101 {
1102         pgoff_t idx;
1103
1104         /* Write non resident data. */
1105         for (idx = 0; bytes; idx++) {
1106                 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1107                 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1108
1109                 if (IS_ERR(page))
1110                         return PTR_ERR(page);
1111
1112                 lock_page(page);
1113                 WARN_ON(!PageUptodate(page));
1114                 ClearPageUptodate(page);
1115
1116                 memcpy(page_address(page), data, op);
1117
1118                 flush_dcache_page(page);
1119                 SetPageUptodate(page);
1120                 unlock_page(page);
1121
1122                 ntfs_unmap_page(page);
1123
1124                 bytes -= op;
1125                 data = Add2Ptr(data, PAGE_SIZE);
1126         }
1127         return 0;
1128 }
1129
1130 /*
1131  * ntfs_reparse_bytes
1132  *
1133  * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1134  * for unicode string of @uni_len length.
1135  */
1136 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1137 {
1138         /* Header + unicode string + decorated unicode string. */
1139         return sizeof(short) * (2 * uni_len + 4) +
1140                offsetof(struct REPARSE_DATA_BUFFER,
1141                         SymbolicLinkReparseBuffer.PathBuffer);
1142 }
1143
1144 static struct REPARSE_DATA_BUFFER *
1145 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1146                            u32 size, u16 *nsize)
1147 {
1148         int i, err;
1149         struct REPARSE_DATA_BUFFER *rp;
1150         __le16 *rp_name;
1151         typeof(rp->SymbolicLinkReparseBuffer) *rs;
1152
1153         rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1154         if (!rp)
1155                 return ERR_PTR(-ENOMEM);
1156
1157         rs = &rp->SymbolicLinkReparseBuffer;
1158         rp_name = rs->PathBuffer;
1159
1160         /* Convert link name to UTF-16. */
1161         err = ntfs_nls_to_utf16(sbi, symname, size,
1162                                 (struct cpu_str *)(rp_name - 1), 2 * size,
1163                                 UTF16_LITTLE_ENDIAN);
1164         if (err < 0)
1165                 goto out;
1166
1167         /* err = the length of unicode name of symlink. */
1168         *nsize = ntfs_reparse_bytes(err);
1169
1170         if (*nsize > sbi->reparse.max_size) {
1171                 err = -EFBIG;
1172                 goto out;
1173         }
1174
1175         /* Translate Linux '/' into Windows '\'. */
1176         for (i = 0; i < err; i++) {
1177                 if (rp_name[i] == cpu_to_le16('/'))
1178                         rp_name[i] = cpu_to_le16('\\');
1179         }
1180
1181         rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1182         rp->ReparseDataLength =
1183                 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1184                                               SymbolicLinkReparseBuffer));
1185
1186         /* PrintName + SubstituteName. */
1187         rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1188         rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1189         rs->PrintNameLength = rs->SubstituteNameOffset;
1190
1191         /*
1192          * TODO: Use relative path if possible to allow Windows to
1193          * parse this path.
1194          * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1195          */
1196         rs->Flags = 0;
1197
1198         memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1199
1200         /* Decorate SubstituteName. */
1201         rp_name += err;
1202         rp_name[0] = cpu_to_le16('\\');
1203         rp_name[1] = cpu_to_le16('?');
1204         rp_name[2] = cpu_to_le16('?');
1205         rp_name[3] = cpu_to_le16('\\');
1206
1207         return rp;
1208 out:
1209         kfree(rp);
1210         return ERR_PTR(err);
1211 }
1212
1213 /*
1214  * ntfs_create_inode
1215  *
1216  * Helper function for:
1217  * - ntfs_create
1218  * - ntfs_mknod
1219  * - ntfs_symlink
1220  * - ntfs_mkdir
1221  * - ntfs_atomic_open
1222  *
1223  * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1224  */
1225 int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1226                       struct dentry *dentry, const struct cpu_str *uni,
1227                       umode_t mode, dev_t dev, const char *symname, u32 size,
1228                       struct ntfs_fnd *fnd)
1229 {
1230         int err;
1231         struct super_block *sb = dir->i_sb;
1232         struct ntfs_sb_info *sbi = sb->s_fs_info;
1233         const struct qstr *name = &dentry->d_name;
1234         CLST ino = 0;
1235         struct ntfs_inode *dir_ni = ntfs_i(dir);
1236         struct ntfs_inode *ni = NULL;
1237         struct inode *inode = NULL;
1238         struct ATTRIB *attr;
1239         struct ATTR_STD_INFO5 *std5;
1240         struct ATTR_FILE_NAME *fname;
1241         struct MFT_REC *rec;
1242         u32 asize, dsize, sd_size;
1243         enum FILE_ATTRIBUTE fa;
1244         __le32 security_id = SECURITY_ID_INVALID;
1245         CLST vcn;
1246         const void *sd;
1247         u16 t16, nsize = 0, aid = 0;
1248         struct INDEX_ROOT *root, *dir_root;
1249         struct NTFS_DE *e, *new_de = NULL;
1250         struct REPARSE_DATA_BUFFER *rp = NULL;
1251         bool rp_inserted = false;
1252
1253         /* New file will be resident or non resident. */
1254         const bool new_file_resident = 1;
1255
1256         if (!fnd)
1257                 ni_lock_dir(dir_ni);
1258
1259         dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1260         if (!dir_root) {
1261                 err = -EINVAL;
1262                 goto out1;
1263         }
1264
1265         if (S_ISDIR(mode)) {
1266                 /* Use parent's directory attributes. */
1267                 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1268                      FILE_ATTRIBUTE_ARCHIVE;
1269                 /*
1270                  * By default child directory inherits parent attributes.
1271                  * Root directory is hidden + system.
1272                  * Make an exception for children in root.
1273                  */
1274                 if (dir->i_ino == MFT_REC_ROOT)
1275                         fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1276         } else if (S_ISLNK(mode)) {
1277                 /* It is good idea that link should be the same type (file/dir) as target */
1278                 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1279
1280                 /*
1281                  * Linux: there are dir/file/symlink and so on.
1282                  * NTFS: symlinks are "dir + reparse" or "file + reparse"
1283                  * It is good idea to create:
1284                  * dir + reparse if 'symname' points to directory
1285                  * or
1286                  * file + reparse if 'symname' points to file
1287                  * Unfortunately kern_path hangs if symname contains 'dir'.
1288                  */
1289
1290                 /*
1291                  *      struct path path;
1292                  *
1293                  *      if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1294                  *              struct inode *target = d_inode(path.dentry);
1295                  *
1296                  *              if (S_ISDIR(target->i_mode))
1297                  *                      fa |= FILE_ATTRIBUTE_DIRECTORY;
1298                  *              // if ( target->i_sb == sb ){
1299                  *              //      use relative path?
1300                  *              // }
1301                  *              path_put(&path);
1302                  *      }
1303                  */
1304         } else if (S_ISREG(mode)) {
1305                 if (sbi->options->sparse) {
1306                         /* Sparsed regular file, cause option 'sparse'. */
1307                         fa = FILE_ATTRIBUTE_SPARSE_FILE |
1308                              FILE_ATTRIBUTE_ARCHIVE;
1309                 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1310                         /* Compressed regular file, if parent is compressed. */
1311                         fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1312                 } else {
1313                         /* Regular file, default attributes. */
1314                         fa = FILE_ATTRIBUTE_ARCHIVE;
1315                 }
1316         } else {
1317                 fa = FILE_ATTRIBUTE_ARCHIVE;
1318         }
1319
1320         /* If option "hide_dot_files" then set hidden attribute for dot files. */
1321         if (sbi->options->hide_dot_files && name->name[0] == '.')
1322                 fa |= FILE_ATTRIBUTE_HIDDEN;
1323
1324         if (!(mode & 0222))
1325                 fa |= FILE_ATTRIBUTE_READONLY;
1326
1327         /* Allocate PATH_MAX bytes. */
1328         new_de = __getname();
1329         if (!new_de) {
1330                 err = -ENOMEM;
1331                 goto out1;
1332         }
1333
1334         if (unlikely(ntfs3_forced_shutdown(sb))) {
1335                 err = -EIO;
1336                 goto out2;
1337         }
1338
1339         /* Mark rw ntfs as dirty. it will be cleared at umount. */
1340         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1341
1342         /* Step 1: allocate and fill new mft record. */
1343         err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1344         if (err)
1345                 goto out2;
1346
1347         ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1348         if (IS_ERR(ni)) {
1349                 err = PTR_ERR(ni);
1350                 ni = NULL;
1351                 goto out3;
1352         }
1353         inode = &ni->vfs_inode;
1354         inode_init_owner(idmap, inode, dir, mode);
1355         mode = inode->i_mode;
1356
1357         ni->i_crtime = current_time(inode);
1358
1359         rec = ni->mi.mrec;
1360         rec->hard_links = cpu_to_le16(1);
1361         attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1362
1363         /* Get default security id. */
1364         sd = s_default_security;
1365         sd_size = sizeof(s_default_security);
1366
1367         if (is_ntfs3(sbi)) {
1368                 security_id = dir_ni->std_security_id;
1369                 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1370                         security_id = sbi->security.def_security_id;
1371
1372                         if (security_id == SECURITY_ID_INVALID &&
1373                             !ntfs_insert_security(sbi, sd, sd_size,
1374                                                   &security_id, NULL))
1375                                 sbi->security.def_security_id = security_id;
1376                 }
1377         }
1378
1379         /* Insert standard info. */
1380         std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1381
1382         if (security_id == SECURITY_ID_INVALID) {
1383                 dsize = sizeof(struct ATTR_STD_INFO);
1384         } else {
1385                 dsize = sizeof(struct ATTR_STD_INFO5);
1386                 std5->security_id = security_id;
1387                 ni->std_security_id = security_id;
1388         }
1389         asize = SIZEOF_RESIDENT + dsize;
1390
1391         attr->type = ATTR_STD;
1392         attr->size = cpu_to_le32(asize);
1393         attr->id = cpu_to_le16(aid++);
1394         attr->res.data_off = SIZEOF_RESIDENT_LE;
1395         attr->res.data_size = cpu_to_le32(dsize);
1396
1397         std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1398                 kernel2nt(&ni->i_crtime);
1399
1400         std5->fa = ni->std_fa = fa;
1401
1402         attr = Add2Ptr(attr, asize);
1403
1404         /* Insert file name. */
1405         err = fill_name_de(sbi, new_de, name, uni);
1406         if (err)
1407                 goto out4;
1408
1409         mi_get_ref(&ni->mi, &new_de->ref);
1410
1411         fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1412
1413         if (sbi->options->windows_names &&
1414             !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1415                 err = -EINVAL;
1416                 goto out4;
1417         }
1418
1419         mi_get_ref(&dir_ni->mi, &fname->home);
1420         fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1421                 fname->dup.a_time = std5->cr_time;
1422         fname->dup.alloc_size = fname->dup.data_size = 0;
1423         fname->dup.fa = std5->fa;
1424         fname->dup.ea_size = fname->dup.reparse = 0;
1425
1426         dsize = le16_to_cpu(new_de->key_size);
1427         asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1428
1429         attr->type = ATTR_NAME;
1430         attr->size = cpu_to_le32(asize);
1431         attr->res.data_off = SIZEOF_RESIDENT_LE;
1432         attr->res.flags = RESIDENT_FLAG_INDEXED;
1433         attr->id = cpu_to_le16(aid++);
1434         attr->res.data_size = cpu_to_le32(dsize);
1435         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1436
1437         attr = Add2Ptr(attr, asize);
1438
1439         if (security_id == SECURITY_ID_INVALID) {
1440                 /* Insert security attribute. */
1441                 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1442
1443                 attr->type = ATTR_SECURE;
1444                 attr->size = cpu_to_le32(asize);
1445                 attr->id = cpu_to_le16(aid++);
1446                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1447                 attr->res.data_size = cpu_to_le32(sd_size);
1448                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1449
1450                 attr = Add2Ptr(attr, asize);
1451         }
1452
1453         attr->id = cpu_to_le16(aid++);
1454         if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1455                 /*
1456                  * Regular directory or symlink to directory.
1457                  * Create root attribute.
1458                  */
1459                 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1460                 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1461
1462                 attr->type = ATTR_ROOT;
1463                 attr->size = cpu_to_le32(asize);
1464
1465                 attr->name_len = ARRAY_SIZE(I30_NAME);
1466                 attr->name_off = SIZEOF_RESIDENT_LE;
1467                 attr->res.data_off =
1468                         cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1469                 attr->res.data_size = cpu_to_le32(dsize);
1470                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1471                        sizeof(I30_NAME));
1472
1473                 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1474                 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1475                 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1476                 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1477                                               sizeof(struct NTFS_DE));
1478                 root->ihdr.total = root->ihdr.used;
1479
1480                 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1481                 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1482                 e->flags = NTFS_IE_LAST;
1483         } else if (S_ISLNK(mode)) {
1484                 /*
1485                  * Symlink to file.
1486                  * Create empty resident data attribute.
1487                  */
1488                 asize = SIZEOF_RESIDENT;
1489
1490                 /* Insert empty ATTR_DATA */
1491                 attr->type = ATTR_DATA;
1492                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1493                 attr->name_off = SIZEOF_RESIDENT_LE;
1494                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1495         } else if (!new_file_resident && S_ISREG(mode)) {
1496                 /*
1497                  * Regular file. Create empty non resident data attribute.
1498                  */
1499                 attr->type = ATTR_DATA;
1500                 attr->non_res = 1;
1501                 attr->nres.evcn = cpu_to_le64(-1ll);
1502                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1503                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1504                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1505                         attr->flags = ATTR_FLAG_SPARSED;
1506                         asize = SIZEOF_NONRESIDENT_EX + 8;
1507                 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1508                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1509                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1510                         attr->flags = ATTR_FLAG_COMPRESSED;
1511                         attr->nres.c_unit = COMPRESSION_UNIT;
1512                         asize = SIZEOF_NONRESIDENT_EX + 8;
1513                 } else {
1514                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1515                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1516                         asize = SIZEOF_NONRESIDENT + 8;
1517                 }
1518                 attr->nres.run_off = attr->name_off;
1519         } else {
1520                 /*
1521                  * Node. Create empty resident data attribute.
1522                  */
1523                 attr->type = ATTR_DATA;
1524                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1525                 attr->name_off = SIZEOF_RESIDENT_LE;
1526                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1527                         attr->flags = ATTR_FLAG_SPARSED;
1528                 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1529                         attr->flags = ATTR_FLAG_COMPRESSED;
1530                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1531                 asize = SIZEOF_RESIDENT;
1532                 ni->ni_flags |= NI_FLAG_RESIDENT;
1533         }
1534
1535         if (S_ISDIR(mode)) {
1536                 ni->ni_flags |= NI_FLAG_DIR;
1537                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1538                 if (err)
1539                         goto out4;
1540         } else if (S_ISLNK(mode)) {
1541                 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1542
1543                 if (IS_ERR(rp)) {
1544                         err = PTR_ERR(rp);
1545                         rp = NULL;
1546                         goto out4;
1547                 }
1548
1549                 /*
1550                  * Insert ATTR_REPARSE.
1551                  */
1552                 attr = Add2Ptr(attr, asize);
1553                 attr->type = ATTR_REPARSE;
1554                 attr->id = cpu_to_le16(aid++);
1555
1556                 /* Resident or non resident? */
1557                 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1558                 t16 = PtrOffset(rec, attr);
1559
1560                 /*
1561                  * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1562                  * It is good idea to keep extened attributes resident.
1563                  */
1564                 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1565                         CLST alen;
1566                         CLST clst = bytes_to_cluster(sbi, nsize);
1567
1568                         /* Bytes per runs. */
1569                         t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1570
1571                         attr->non_res = 1;
1572                         attr->nres.evcn = cpu_to_le64(clst - 1);
1573                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1574                         attr->nres.run_off = attr->name_off;
1575                         attr->nres.data_size = cpu_to_le64(nsize);
1576                         attr->nres.valid_size = attr->nres.data_size;
1577                         attr->nres.alloc_size =
1578                                 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1579
1580                         err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1581                                                      clst, NULL, ALLOCATE_DEF,
1582                                                      &alen, 0, NULL, NULL);
1583                         if (err)
1584                                 goto out5;
1585
1586                         err = run_pack(&ni->file.run, 0, clst,
1587                                        Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1588                                        &vcn);
1589                         if (err < 0)
1590                                 goto out5;
1591
1592                         if (vcn != clst) {
1593                                 err = -EINVAL;
1594                                 goto out5;
1595                         }
1596
1597                         asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1598                         /* Write non resident data. */
1599                         err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1600                                                 nsize, 0);
1601                         if (err)
1602                                 goto out5;
1603                 } else {
1604                         attr->res.data_off = SIZEOF_RESIDENT_LE;
1605                         attr->res.data_size = cpu_to_le32(nsize);
1606                         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1607                 }
1608                 /* Size of symlink equals the length of input string. */
1609                 inode->i_size = size;
1610
1611                 attr->size = cpu_to_le32(asize);
1612
1613                 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1614                                           &new_de->ref);
1615                 if (err)
1616                         goto out5;
1617
1618                 rp_inserted = true;
1619         }
1620
1621         attr = Add2Ptr(attr, asize);
1622         attr->type = ATTR_END;
1623
1624         rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1625         rec->next_attr_id = cpu_to_le16(aid);
1626
1627         inode->i_generation = le16_to_cpu(rec->seq);
1628
1629         if (S_ISDIR(mode)) {
1630                 inode->i_op = &ntfs_dir_inode_operations;
1631                 if (is_legacy_ntfs(inode->i_sb))
1632                         inode->i_fop = &ntfs_legacy_dir_operations;
1633                 else
1634                         inode->i_fop = &ntfs_dir_operations;
1635         } else if (S_ISLNK(mode)) {
1636                 inode->i_op = &ntfs_link_inode_operations;
1637                 inode->i_fop = NULL;
1638                 inode->i_mapping->a_ops = &ntfs_aops;
1639                 inode->i_size = size;
1640                 inode_nohighmem(inode);
1641         } else if (S_ISREG(mode)) {
1642                 inode->i_op = &ntfs_file_inode_operations;
1643                 if (is_legacy_ntfs(inode->i_sb))
1644                         inode->i_fop = &ntfs_legacy_file_operations;
1645                 else
1646                         inode->i_fop = &ntfs_file_operations;
1647                 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1648                                                               &ntfs_aops;
1649                 init_rwsem(&ni->file.run_lock);
1650         } else {
1651                 inode->i_op = &ntfs_special_inode_operations;
1652                 init_special_inode(inode, mode, dev);
1653         }
1654
1655 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1656         if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1657                 err = ntfs_init_acl(idmap, inode, dir);
1658                 if (err)
1659                         goto out5;
1660         } else
1661 #endif
1662         {
1663                 inode->i_flags |= S_NOSEC;
1664         }
1665
1666         /*
1667          * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1668          * The packed size of extended attribute is stored in direntry too.
1669          * 'fname' here points to inside new_de.
1670          */
1671         ntfs_save_wsl_perm(inode, &fname->dup.ea_size);
1672
1673         /*
1674          * update ea_size in file_name attribute too.
1675          * Use ni_find_attr cause layout of MFT record may be changed
1676          * in ntfs_init_acl and ntfs_save_wsl_perm.
1677          */
1678         attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
1679         if (attr) {
1680                 struct ATTR_FILE_NAME *fn;
1681
1682                 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1683                 if (fn)
1684                         fn->dup.ea_size = fname->dup.ea_size;
1685         }
1686
1687         /* We do not need to update parent directory later */
1688         ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1689
1690         /* Step 2: Add new name in index. */
1691         err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1692         if (err)
1693                 goto out6;
1694
1695         /*
1696          * Call 'd_instantiate' after inode->i_op is set
1697          * but before finish_open.
1698          */
1699         d_instantiate(dentry, inode);
1700
1701         /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1702         inode_set_atime_to_ts(inode, ni->i_crtime);
1703         inode_set_ctime_to_ts(inode, ni->i_crtime);
1704         inode_set_mtime_to_ts(inode, ni->i_crtime);
1705         inode_set_mtime_to_ts(dir, ni->i_crtime);
1706         inode_set_ctime_to_ts(dir, ni->i_crtime);
1707
1708         mark_inode_dirty(dir);
1709         mark_inode_dirty(inode);
1710
1711         /* Normal exit. */
1712         goto out2;
1713
1714 out6:
1715         if (rp_inserted)
1716                 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1717
1718 out5:
1719         if (!S_ISDIR(mode))
1720                 run_deallocate(sbi, &ni->file.run, false);
1721
1722 out4:
1723         clear_rec_inuse(rec);
1724         clear_nlink(inode);
1725         ni->mi.dirty = false;
1726         discard_new_inode(inode);
1727 out3:
1728         ntfs_mark_rec_free(sbi, ino, false);
1729
1730 out2:
1731         __putname(new_de);
1732         kfree(rp);
1733
1734 out1:
1735         if (!fnd)
1736                 ni_unlock(dir_ni);
1737
1738         if (!err)
1739                 unlock_new_inode(inode);
1740
1741         return err;
1742 }
1743
1744 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1745 {
1746         int err;
1747         struct ntfs_inode *ni = ntfs_i(inode);
1748         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1749         struct NTFS_DE *de;
1750
1751         /* Allocate PATH_MAX bytes. */
1752         de = __getname();
1753         if (!de)
1754                 return -ENOMEM;
1755
1756         /* Mark rw ntfs as dirty. It will be cleared at umount. */
1757         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1758
1759         /* Construct 'de'. */
1760         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1761         if (err)
1762                 goto out;
1763
1764         err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1765 out:
1766         __putname(de);
1767         return err;
1768 }
1769
1770 /*
1771  * ntfs_unlink_inode
1772  *
1773  * inode_operations::unlink
1774  * inode_operations::rmdir
1775  */
1776 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1777 {
1778         int err;
1779         struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1780         struct inode *inode = d_inode(dentry);
1781         struct ntfs_inode *ni = ntfs_i(inode);
1782         struct ntfs_inode *dir_ni = ntfs_i(dir);
1783         struct NTFS_DE *de, *de2 = NULL;
1784         int undo_remove;
1785
1786         if (ntfs_is_meta_file(sbi, ni->mi.rno))
1787                 return -EINVAL;
1788
1789         /* Allocate PATH_MAX bytes. */
1790         de = __getname();
1791         if (!de)
1792                 return -ENOMEM;
1793
1794         ni_lock(ni);
1795
1796         if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1797                 err = -ENOTEMPTY;
1798                 goto out;
1799         }
1800
1801         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1802         if (err < 0)
1803                 goto out;
1804
1805         undo_remove = 0;
1806         err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1807
1808         if (!err) {
1809                 drop_nlink(inode);
1810                 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1811                 mark_inode_dirty(dir);
1812                 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1813                 if (inode->i_nlink)
1814                         mark_inode_dirty(inode);
1815         } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1816                 _ntfs_bad_inode(inode);
1817         } else {
1818                 if (ni_is_dirty(dir))
1819                         mark_inode_dirty(dir);
1820                 if (ni_is_dirty(inode))
1821                         mark_inode_dirty(inode);
1822         }
1823
1824 out:
1825         ni_unlock(ni);
1826         __putname(de);
1827         return err;
1828 }
1829
1830 void ntfs_evict_inode(struct inode *inode)
1831 {
1832         truncate_inode_pages_final(&inode->i_data);
1833
1834         invalidate_inode_buffers(inode);
1835         clear_inode(inode);
1836
1837         ni_clear(ntfs_i(inode));
1838 }
1839
1840 /*
1841  * ntfs_translate_junction
1842  *
1843  * Translate a Windows junction target to the Linux equivalent.
1844  * On junctions, targets are always absolute (they include the drive
1845  * letter). We have no way of knowing if the target is for the current
1846  * mounted device or not so we just assume it is.
1847  */
1848 static int ntfs_translate_junction(const struct super_block *sb,
1849                                    const struct dentry *link_de, char *target,
1850                                    int target_len, int target_max)
1851 {
1852         int tl_len, err = target_len;
1853         char *link_path_buffer = NULL, *link_path;
1854         char *translated = NULL;
1855         char *target_start;
1856         int copy_len;
1857
1858         link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1859         if (!link_path_buffer) {
1860                 err = -ENOMEM;
1861                 goto out;
1862         }
1863         /* Get link path, relative to mount point */
1864         link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1865         if (IS_ERR(link_path)) {
1866                 ntfs_err(sb, "Error getting link path");
1867                 err = -EINVAL;
1868                 goto out;
1869         }
1870
1871         translated = kmalloc(PATH_MAX, GFP_NOFS);
1872         if (!translated) {
1873                 err = -ENOMEM;
1874                 goto out;
1875         }
1876
1877         /* Make translated path a relative path to mount point */
1878         strcpy(translated, "./");
1879         ++link_path; /* Skip leading / */
1880         for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1881                 if (*link_path == '/') {
1882                         if (PATH_MAX - tl_len < sizeof("../")) {
1883                                 ntfs_err(sb,
1884                                          "Link path %s has too many components",
1885                                          link_path);
1886                                 err = -EINVAL;
1887                                 goto out;
1888                         }
1889                         strcpy(translated + tl_len, "../");
1890                         tl_len += sizeof("../") - 1;
1891                 }
1892         }
1893
1894         /* Skip drive letter */
1895         target_start = target;
1896         while (*target_start && *target_start != ':')
1897                 ++target_start;
1898
1899         if (!*target_start) {
1900                 ntfs_err(sb, "Link target (%s) missing drive separator",
1901                          target);
1902                 err = -EINVAL;
1903                 goto out;
1904         }
1905
1906         /* Skip drive separator and leading /, if exists */
1907         target_start += 1 + (target_start[1] == '/');
1908         copy_len = target_len - (target_start - target);
1909
1910         if (PATH_MAX - tl_len <= copy_len) {
1911                 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1912                          target_start, PATH_MAX - tl_len, copy_len);
1913                 err = -EINVAL;
1914                 goto out;
1915         }
1916
1917         /* translated path has a trailing / and target_start does not */
1918         strcpy(translated + tl_len, target_start);
1919         tl_len += copy_len;
1920         if (target_max <= tl_len) {
1921                 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1922                          translated, target_max, tl_len);
1923                 err = -EINVAL;
1924                 goto out;
1925         }
1926         strcpy(target, translated);
1927         err = tl_len;
1928
1929 out:
1930         kfree(link_path_buffer);
1931         kfree(translated);
1932         return err;
1933 }
1934
1935 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1936                                       struct inode *inode, char *buffer,
1937                                       int buflen)
1938 {
1939         int i, err = -EINVAL;
1940         struct ntfs_inode *ni = ntfs_i(inode);
1941         struct super_block *sb = inode->i_sb;
1942         struct ntfs_sb_info *sbi = sb->s_fs_info;
1943         u64 size;
1944         u16 ulen = 0;
1945         void *to_free = NULL;
1946         struct REPARSE_DATA_BUFFER *rp;
1947         const __le16 *uname;
1948         struct ATTRIB *attr;
1949
1950         /* Reparse data present. Try to parse it. */
1951         static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1952         static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1953
1954         *buffer = 0;
1955
1956         attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1957         if (!attr)
1958                 goto out;
1959
1960         if (!attr->non_res) {
1961                 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1962                 if (!rp)
1963                         goto out;
1964                 size = le32_to_cpu(attr->res.data_size);
1965         } else {
1966                 size = le64_to_cpu(attr->nres.data_size);
1967                 rp = NULL;
1968         }
1969
1970         if (size > sbi->reparse.max_size || size <= sizeof(u32))
1971                 goto out;
1972
1973         if (!rp) {
1974                 rp = kmalloc(size, GFP_NOFS);
1975                 if (!rp) {
1976                         err = -ENOMEM;
1977                         goto out;
1978                 }
1979                 to_free = rp;
1980                 /* Read into temporal buffer. */
1981                 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1982                 if (err)
1983                         goto out;
1984         }
1985
1986         /* Microsoft Tag. */
1987         switch (rp->ReparseTag) {
1988         case IO_REPARSE_TAG_MOUNT_POINT:
1989                 /* Mount points and junctions. */
1990                 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1991                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1992                                      MountPointReparseBuffer.PathBuffer))
1993                         goto out;
1994                 uname = Add2Ptr(rp,
1995                                 offsetof(struct REPARSE_DATA_BUFFER,
1996                                          MountPointReparseBuffer.PathBuffer) +
1997                                         le16_to_cpu(rp->MountPointReparseBuffer
1998                                                             .PrintNameOffset));
1999                 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
2000                 break;
2001
2002         case IO_REPARSE_TAG_SYMLINK:
2003                 /* FolderSymbolicLink */
2004                 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
2005                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
2006                                      SymbolicLinkReparseBuffer.PathBuffer))
2007                         goto out;
2008                 uname = Add2Ptr(
2009                         rp, offsetof(struct REPARSE_DATA_BUFFER,
2010                                      SymbolicLinkReparseBuffer.PathBuffer) +
2011                                     le16_to_cpu(rp->SymbolicLinkReparseBuffer
2012                                                         .PrintNameOffset));
2013                 ulen = le16_to_cpu(
2014                         rp->SymbolicLinkReparseBuffer.PrintNameLength);
2015                 break;
2016
2017         case IO_REPARSE_TAG_CLOUD:
2018         case IO_REPARSE_TAG_CLOUD_1:
2019         case IO_REPARSE_TAG_CLOUD_2:
2020         case IO_REPARSE_TAG_CLOUD_3:
2021         case IO_REPARSE_TAG_CLOUD_4:
2022         case IO_REPARSE_TAG_CLOUD_5:
2023         case IO_REPARSE_TAG_CLOUD_6:
2024         case IO_REPARSE_TAG_CLOUD_7:
2025         case IO_REPARSE_TAG_CLOUD_8:
2026         case IO_REPARSE_TAG_CLOUD_9:
2027         case IO_REPARSE_TAG_CLOUD_A:
2028         case IO_REPARSE_TAG_CLOUD_B:
2029         case IO_REPARSE_TAG_CLOUD_C:
2030         case IO_REPARSE_TAG_CLOUD_D:
2031         case IO_REPARSE_TAG_CLOUD_E:
2032         case IO_REPARSE_TAG_CLOUD_F:
2033                 err = sizeof("OneDrive") - 1;
2034                 if (err > buflen)
2035                         err = buflen;
2036                 memcpy(buffer, "OneDrive", err);
2037                 goto out;
2038
2039         default:
2040                 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2041                         /* Unknown Microsoft Tag. */
2042                         goto out;
2043                 }
2044                 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2045                     size <= sizeof(struct REPARSE_POINT)) {
2046                         goto out;
2047                 }
2048
2049                 /* Users tag. */
2050                 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2051                 ulen = le16_to_cpu(rp->ReparseDataLength) -
2052                        sizeof(struct REPARSE_POINT);
2053         }
2054
2055         /* Convert nlen from bytes to UNICODE chars. */
2056         ulen >>= 1;
2057
2058         /* Check that name is available. */
2059         if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2060                 goto out;
2061
2062         /* If name is already zero terminated then truncate it now. */
2063         if (!uname[ulen - 1])
2064                 ulen -= 1;
2065
2066         err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2067
2068         if (err < 0)
2069                 goto out;
2070
2071         /* Translate Windows '\' into Linux '/'. */
2072         for (i = 0; i < err; i++) {
2073                 if (buffer[i] == '\\')
2074                         buffer[i] = '/';
2075         }
2076
2077         /* Always set last zero. */
2078         buffer[err] = 0;
2079
2080         /* If this is a junction, translate the link target. */
2081         if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2082                 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2083
2084 out:
2085         kfree(to_free);
2086         return err;
2087 }
2088
2089 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2090                                  struct delayed_call *done)
2091 {
2092         int err;
2093         char *ret;
2094
2095         if (!de)
2096                 return ERR_PTR(-ECHILD);
2097
2098         ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2099         if (!ret)
2100                 return ERR_PTR(-ENOMEM);
2101
2102         err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2103         if (err < 0) {
2104                 kfree(ret);
2105                 return ERR_PTR(err);
2106         }
2107
2108         set_delayed_call(done, kfree_link, ret);
2109
2110         return ret;
2111 }
2112
2113 // clang-format off
2114 const struct inode_operations ntfs_link_inode_operations = {
2115         .get_link       = ntfs_get_link,
2116         .setattr        = ntfs3_setattr,
2117         .listxattr      = ntfs_listxattr,
2118 };
2119
2120 const struct address_space_operations ntfs_aops = {
2121         .read_folio     = ntfs_read_folio,
2122         .readahead      = ntfs_readahead,
2123         .writepages     = ntfs_writepages,
2124         .write_begin    = ntfs_write_begin,
2125         .write_end      = ntfs_write_end,
2126         .direct_IO      = ntfs_direct_IO,
2127         .bmap           = ntfs_bmap,
2128         .dirty_folio    = block_dirty_folio,
2129         .migrate_folio  = buffer_migrate_folio,
2130         .invalidate_folio = block_invalidate_folio,
2131 };
2132
2133 const struct address_space_operations ntfs_aops_cmpr = {
2134         .read_folio     = ntfs_read_folio,
2135         .readahead      = ntfs_readahead,
2136 };
2137 // clang-format on