fs/ntfs3/inode.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *
   4  * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
   5  *
   6  */
   7
   8 #include <linux/buffer_head.h>
   9 #include <linux/fs.h>
  10 #include <linux/mpage.h>
  11 #include <linux/namei.h>
  12 #include <linux/nls.h>
  13 #include <linux/uio.h>
  14 #include <linux/writeback.h>
  15
  16 #include "debug.h"
  17 #include "ntfs.h"
  18 #include "ntfs_fs.h"
  19
  20 /*
  21  * ntfs_read_mft - Read record and parses MFT.
  22  */
  23 static struct inode *ntfs_read_mft(struct inode *inode,
  24                                    const struct cpu_str *name,
  25                                    const struct MFT_REF *ref)
  26 {
  27         int err = 0;
  28         struct ntfs_inode *ni = ntfs_i(inode);
  29         struct super_block *sb = inode->i_sb;
  30         struct ntfs_sb_info *sbi = sb->s_fs_info;
  31         mode_t mode = 0;
  32         struct ATTR_STD_INFO5 *std5 = NULL;
  33         struct ATTR_LIST_ENTRY *le;
  34         struct ATTRIB *attr;
  35         bool is_match = false;
  36         bool is_root = false;
  37         bool is_dir;
  38         unsigned long ino = inode->i_ino;
  39         u32 rp_fa = 0, asize, t32;
  40         u16 roff, rsize, names = 0;
  41         const struct ATTR_FILE_NAME *fname = NULL;
  42         const struct INDEX_ROOT *root;
  43         struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
  44         u64 t64;
  45         struct MFT_REC *rec;
  46         struct runs_tree *run;
  47
  48         inode->i_op = NULL;
  49         /* Setup 'uid' and 'gid' */
  50         inode->i_uid = sbi->options->fs_uid;
  51         inode->i_gid = sbi->options->fs_gid;
  52
  53         err = mi_init(&ni->mi, sbi, ino);
  54         if (err)
  55                 goto out;
  56
  57         if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
  58                 t64 = sbi->mft.lbo >> sbi->cluster_bits;
  59                 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
  60                 sbi->mft.ni = ni;
  61                 init_rwsem(&ni->file.run_lock);
  62
  63                 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
  64                         err = -ENOMEM;
  65                         goto out;
  66                 }
  67         }
  68
  69         err = mi_read(&ni->mi, ino == MFT_REC_MFT);
  70
  71         if (err)
  72                 goto out;
  73
  74         rec = ni->mi.mrec;
  75
  76         if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
  77                 ;
  78         } else if (ref->seq != rec->seq) {
  79                 err = -EINVAL;
  80                 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
  81                          le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
  82                 goto out;
  83         } else if (!is_rec_inuse(rec)) {
  84                 err = -EINVAL;
  85                 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
  86                 goto out;
  87         }
  88
  89         if (le32_to_cpu(rec->total) != sbi->record_size) {
  90                 /* Bad inode? */
  91                 err = -EINVAL;
  92                 goto out;
  93         }
  94
  95         if (!is_rec_base(rec))
  96                 goto Ok;
  97
  98         /* Record should contain $I30 root. */
  99         is_dir = rec->flags & RECORD_FLAG_DIR;
 100
 101         inode->i_generation = le16_to_cpu(rec->seq);
 102
 103         /* Enumerate all struct Attributes MFT. */
 104         le = NULL;
 105         attr = NULL;
 106
 107         /*
 108          * To reduce tab pressure use goto instead of
 109          * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
 110          */
 111 next_attr:
 112         run = NULL;
 113         err = -EINVAL;
 114         attr = ni_enum_attr_ex(ni, attr, &le, NULL);
 115         if (!attr)
 116                 goto end_enum;
 117
 118         if (le && le->vcn) {
 119                 /* This is non primary attribute segment. Ignore if not MFT. */
 120                 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
 121                         goto next_attr;
 122
 123                 run = &ni->file.run;
 124                 asize = le32_to_cpu(attr->size);
 125                 goto attr_unpack_run;
 126         }
 127
 128         roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
 129         rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
 130         asize = le32_to_cpu(attr->size);
 131
 132         switch (attr->type) {
 133         case ATTR_STD:
 134                 if (attr->non_res ||
 135                     asize < sizeof(struct ATTR_STD_INFO) + roff ||
 136                     rsize < sizeof(struct ATTR_STD_INFO))
 137                         goto out;
 138
 139                 if (std5)
 140                         goto next_attr;
 141
 142                 std5 = Add2Ptr(attr, roff);
 143
 144 #ifdef STATX_BTIME
 145                 nt2kernel(std5->cr_time, &ni->i_crtime);
 146 #endif
 147                 nt2kernel(std5->a_time, &inode->i_atime);
 148                 nt2kernel(std5->c_time, &inode->i_ctime);
 149                 nt2kernel(std5->m_time, &inode->i_mtime);
 150
 151                 ni->std_fa = std5->fa;
 152
 153                 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
 154                     rsize >= sizeof(struct ATTR_STD_INFO5))
 155                         ni->std_security_id = std5->security_id;
 156                 goto next_attr;
 157
 158         case ATTR_LIST:
 159                 if (attr->name_len || le || ino == MFT_REC_LOG)
 160                         goto out;
 161
 162                 err = ntfs_load_attr_list(ni, attr);
 163                 if (err)
 164                         goto out;
 165
 166                 le = NULL;
 167                 attr = NULL;
 168                 goto next_attr;
 169
 170         case ATTR_NAME:
 171                 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
 172                     rsize < SIZEOF_ATTRIBUTE_FILENAME)
 173                         goto out;
 174
 175                 fname = Add2Ptr(attr, roff);
 176                 if (fname->type == FILE_NAME_DOS)
 177                         goto next_attr;
 178
 179                 names += 1;
 180                 if (name && name->len == fname->name_len &&
 181                     !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
 182                                         NULL, false))
 183                         is_match = true;
 184
 185                 goto next_attr;
 186
 187         case ATTR_DATA:
 188                 if (is_dir) {
 189                         /* Ignore data attribute in dir record. */
 190                         goto next_attr;
 191                 }
 192
 193                 if (ino == MFT_REC_BADCLUST && !attr->non_res)
 194                         goto next_attr;
 195
 196                 if (attr->name_len &&
 197                     ((ino != MFT_REC_BADCLUST || !attr->non_res ||
 198                       attr->name_len != ARRAY_SIZE(BAD_NAME) ||
 199                       memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
 200                      (ino != MFT_REC_SECURE || !attr->non_res ||
 201                       attr->name_len != ARRAY_SIZE(SDS_NAME) ||
 202                       memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
 203                         /* File contains stream attribute. Ignore it. */
 204                         goto next_attr;
 205                 }
 206
 207                 if (is_attr_sparsed(attr))
 208                         ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
 209                 else
 210                         ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
 211
 212                 if (is_attr_compressed(attr))
 213                         ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
 214                 else
 215                         ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
 216
 217                 if (is_attr_encrypted(attr))
 218                         ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
 219                 else
 220                         ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
 221
 222                 if (!attr->non_res) {
 223                         ni->i_valid = inode->i_size = rsize;
 224                         inode_set_bytes(inode, rsize);
 225                 }
 226
 227                 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
 228
 229                 if (!attr->non_res) {
 230                         ni->ni_flags |= NI_FLAG_RESIDENT;
 231                         goto next_attr;
 232                 }
 233
 234                 inode_set_bytes(inode, attr_ondisk_size(attr));
 235
 236                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 237                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 238                 if (!attr->nres.alloc_size)
 239                         goto next_attr;
 240
 241                 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run
 242                                             : &ni->file.run;
 243                 break;
 244
 245         case ATTR_ROOT:
 246                 if (attr->non_res)
 247                         goto out;
 248
 249                 root = Add2Ptr(attr, roff);
 250                 is_root = true;
 251
 252                 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
 253                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 254                         goto next_attr;
 255
 256                 if (root->type != ATTR_NAME ||
 257                     root->rule != NTFS_COLLATION_TYPE_FILENAME)
 258                         goto out;
 259
 260                 if (!is_dir)
 261                         goto next_attr;
 262
 263                 ni->ni_flags |= NI_FLAG_DIR;
 264
 265                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
 266                 if (err)
 267                         goto out;
 268
 269                 mode = sb->s_root
 270                                ? (S_IFDIR | (0777 & sbi->options->fs_dmask_inv))
 271                                : (S_IFDIR | 0777);
 272                 goto next_attr;
 273
 274         case ATTR_ALLOC:
 275                 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
 276                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 277                         goto next_attr;
 278
 279                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 280                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 281                 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
 282
 283                 run = &ni->dir.alloc_run;
 284                 break;
 285
 286         case ATTR_BITMAP:
 287                 if (ino == MFT_REC_MFT) {
 288                         if (!attr->non_res)
 289                                 goto out;
 290 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
 291                         /* 0x20000000 = 2^32 / 8 */
 292                         if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
 293                                 goto out;
 294 #endif
 295                         run = &sbi->mft.bitmap.run;
 296                         break;
 297                 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
 298                            !memcmp(attr_name(attr), I30_NAME,
 299                                    sizeof(I30_NAME)) &&
 300                            attr->non_res) {
 301                         run = &ni->dir.bitmap_run;
 302                         break;
 303                 }
 304                 goto next_attr;
 305
 306         case ATTR_REPARSE:
 307                 if (attr->name_len)
 308                         goto next_attr;
 309
 310                 rp_fa = ni_parse_reparse(ni, attr, &rp);
 311                 switch (rp_fa) {
 312                 case REPARSE_LINK:
 313                         /*
 314                          * Normal symlink.
 315                          * Assume one unicode symbol == one utf8.
 316                          */
 317                         inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
 318                                                             .PrintNameLength) /
 319                                         sizeof(u16);
 320
 321                         ni->i_valid = inode->i_size;
 322
 323                         /* Clear directory bit. */
 324                         if (ni->ni_flags & NI_FLAG_DIR) {
 325                                 indx_clear(&ni->dir);
 326                                 memset(&ni->dir, 0, sizeof(ni->dir));
 327                                 ni->ni_flags &= ~NI_FLAG_DIR;
 328                         } else {
 329                                 run_close(&ni->file.run);
 330                         }
 331                         mode = S_IFLNK | 0777;
 332                         is_dir = false;
 333                         if (attr->non_res) {
 334                                 run = &ni->file.run;
 335                                 goto attr_unpack_run; // Double break.
 336                         }
 337                         break;
 338
 339                 case REPARSE_COMPRESSED:
 340                         break;
 341
 342                 case REPARSE_DEDUPLICATED:
 343                         break;
 344                 }
 345                 goto next_attr;
 346
 347         case ATTR_EA_INFO:
 348                 if (!attr->name_len &&
 349                     resident_data_ex(attr, sizeof(struct EA_INFO))) {
 350                         ni->ni_flags |= NI_FLAG_EA;
 351                         /*
 352                          * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
 353                          */
 354                         inode->i_mode = mode;
 355                         ntfs_get_wsl_perm(inode);
 356                         mode = inode->i_mode;
 357                 }
 358                 goto next_attr;
 359
 360         default:
 361                 goto next_attr;
 362         }
 363
 364 attr_unpack_run:
 365         roff = le16_to_cpu(attr->nres.run_off);
 366
 367         t64 = le64_to_cpu(attr->nres.svcn);
 368         err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
 369                             t64, Add2Ptr(attr, roff), asize - roff);
 370         if (err < 0)
 371                 goto out;
 372         err = 0;
 373         goto next_attr;
 374
 375 end_enum:
 376
 377         if (!std5)
 378                 goto out;
 379
 380         if (!is_match && name) {
 381                 /* Reuse rec as buffer for ascii name. */
 382                 err = -ENOENT;
 383                 goto out;
 384         }
 385
 386         if (std5->fa & FILE_ATTRIBUTE_READONLY)
 387                 mode &= ~0222;
 388
 389         if (!names) {
 390                 err = -EINVAL;
 391                 goto out;
 392         }
 393
 394         if (names != le16_to_cpu(rec->hard_links)) {
 395                 /* Correct minor error on the fly. Do not mark inode as dirty. */
 396                 rec->hard_links = cpu_to_le16(names);
 397                 ni->mi.dirty = true;
 398         }
 399
 400         set_nlink(inode, names);
 401
 402         if (S_ISDIR(mode)) {
 403                 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
 404
 405                 /*
 406                  * Dot and dot-dot should be included in count but was not
 407                  * included in enumeration.
 408                  * Usually a hard links to directories are disabled.
 409                  */
 410                 inode->i_op = &ntfs_dir_inode_operations;
 411                 inode->i_fop = &ntfs_dir_operations;
 412                 ni->i_valid = 0;
 413         } else if (S_ISLNK(mode)) {
 414                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 415                 inode->i_op = &ntfs_link_inode_operations;
 416                 inode->i_fop = NULL;
 417                 inode_nohighmem(inode);
 418         } else if (S_ISREG(mode)) {
 419                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 420                 inode->i_op = &ntfs_file_inode_operations;
 421                 inode->i_fop = &ntfs_file_operations;
 422                 inode->i_mapping->a_ops =
 423                         is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
 424                 if (ino != MFT_REC_MFT)
 425                         init_rwsem(&ni->file.run_lock);
 426         } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
 427                    S_ISSOCK(mode)) {
 428                 inode->i_op = &ntfs_special_inode_operations;
 429                 init_special_inode(inode, mode, inode->i_rdev);
 430         } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
 431                    fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
 432                 /* Records in $Extend are not a files or general directories. */
 433         } else {
 434                 err = -EINVAL;
 435                 goto out;
 436         }
 437
 438         if ((sbi->options->sys_immutable &&
 439              (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
 440             !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
 441                 inode->i_flags |= S_IMMUTABLE;
 442         } else {
 443                 inode->i_flags &= ~S_IMMUTABLE;
 444         }
 445
 446         inode->i_mode = mode;
 447         if (!(ni->ni_flags & NI_FLAG_EA)) {
 448                 /* If no xattr then no security (stored in xattr). */
 449                 inode->i_flags |= S_NOSEC;
 450         }
 451
 452 Ok:
 453         if (ino == MFT_REC_MFT && !sb->s_root)
 454                 sbi->mft.ni = NULL;
 455
 456         unlock_new_inode(inode);
 457
 458         return inode;
 459
 460 out:
 461         if (ino == MFT_REC_MFT && !sb->s_root)
 462                 sbi->mft.ni = NULL;
 463
 464         iget_failed(inode);
 465         return ERR_PTR(err);
 466 }
 467
 468 /*
 469  * ntfs_test_inode
 470  *
 471  * Return: 1 if match.
 472  */
 473 static int ntfs_test_inode(struct inode *inode, void *data)
 474 {
 475         struct MFT_REF *ref = data;
 476
 477         return ino_get(ref) == inode->i_ino;
 478 }
 479
 480 static int ntfs_set_inode(struct inode *inode, void *data)
 481 {
 482         const struct MFT_REF *ref = data;
 483
 484         inode->i_ino = ino_get(ref);
 485         return 0;
 486 }
 487
 488 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
 489                          const struct cpu_str *name)
 490 {
 491         struct inode *inode;
 492
 493         inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
 494                              (void *)ref);
 495         if (unlikely(!inode))
 496                 return ERR_PTR(-ENOMEM);
 497
 498         /* If this is a freshly allocated inode, need to read it now. */
 499         if (inode->i_state & I_NEW)
 500                 inode = ntfs_read_mft(inode, name, ref);
 501         else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
 502                 /* Inode overlaps? */
 503                 make_bad_inode(inode);
 504         }
 505
 506         return inode;
 507 }
 508
 509 enum get_block_ctx {
 510         GET_BLOCK_GENERAL = 0,
 511         GET_BLOCK_WRITE_BEGIN = 1,
 512         GET_BLOCK_DIRECT_IO_R = 2,
 513         GET_BLOCK_DIRECT_IO_W = 3,
 514         GET_BLOCK_BMAP = 4,
 515 };
 516
 517 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
 518                                        struct buffer_head *bh, int create,
 519                                        enum get_block_ctx ctx)
 520 {
 521         struct super_block *sb = inode->i_sb;
 522         struct ntfs_sb_info *sbi = sb->s_fs_info;
 523         struct ntfs_inode *ni = ntfs_i(inode);
 524         struct page *page = bh->b_page;
 525         u8 cluster_bits = sbi->cluster_bits;
 526         u32 block_size = sb->s_blocksize;
 527         u64 bytes, lbo, valid;
 528         u32 off;
 529         int err;
 530         CLST vcn, lcn, len;
 531         bool new;
 532
 533         /* Clear previous state. */
 534         clear_buffer_new(bh);
 535         clear_buffer_uptodate(bh);
 536
 537         /* Direct write uses 'create=0'. */
 538         if (!create && vbo >= ni->i_valid) {
 539                 /* Out of valid. */
 540                 return 0;
 541         }
 542
 543         if (vbo >= inode->i_size) {
 544                 /* Out of size. */
 545                 return 0;
 546         }
 547
 548         if (is_resident(ni)) {
 549                 ni_lock(ni);
 550                 err = attr_data_read_resident(ni, page);
 551                 ni_unlock(ni);
 552
 553                 if (!err)
 554                         set_buffer_uptodate(bh);
 555                 bh->b_size = block_size;
 556                 return err;
 557         }
 558
 559         vcn = vbo >> cluster_bits;
 560         off = vbo & sbi->cluster_mask;
 561         new = false;
 562
 563         err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL);
 564         if (err)
 565                 goto out;
 566
 567         if (!len)
 568                 return 0;
 569
 570         bytes = ((u64)len << cluster_bits) - off;
 571
 572         if (lcn == SPARSE_LCN) {
 573                 if (!create) {
 574                         if (bh->b_size > bytes)
 575                                 bh->b_size = bytes;
 576                         return 0;
 577                 }
 578                 WARN_ON(1);
 579         }
 580
 581         if (new) {
 582                 set_buffer_new(bh);
 583                 if ((len << cluster_bits) > block_size)
 584                         ntfs_sparse_cluster(inode, page, vcn, len);
 585         }
 586
 587         lbo = ((u64)lcn << cluster_bits) + off;
 588
 589         set_buffer_mapped(bh);
 590         bh->b_bdev = sb->s_bdev;
 591         bh->b_blocknr = lbo >> sb->s_blocksize_bits;
 592
 593         valid = ni->i_valid;
 594
 595         if (ctx == GET_BLOCK_DIRECT_IO_W) {
 596                 /* ntfs_direct_IO will update ni->i_valid. */
 597                 if (vbo >= valid)
 598                         set_buffer_new(bh);
 599         } else if (create) {
 600                 /* Normal write. */
 601                 if (bytes > bh->b_size)
 602                         bytes = bh->b_size;
 603
 604                 if (vbo >= valid)
 605                         set_buffer_new(bh);
 606
 607                 if (vbo + bytes > valid) {
 608                         ni->i_valid = vbo + bytes;
 609                         mark_inode_dirty(inode);
 610                 }
 611         } else if (vbo >= valid) {
 612                 /* Read out of valid data. */
 613                 /* Should never be here 'cause already checked. */
 614                 clear_buffer_mapped(bh);
 615         } else if (vbo + bytes <= valid) {
 616                 /* Normal read. */
 617         } else if (vbo + block_size <= valid) {
 618                 /* Normal short read. */
 619                 bytes = block_size;
 620         } else {
 621                 /*
 622                  * Read across valid size: vbo < valid && valid < vbo + block_size
 623                  */
 624                 bytes = block_size;
 625
 626                 if (page) {
 627                         u32 voff = valid - vbo;
 628
 629                         bh->b_size = block_size;
 630                         off = vbo & (PAGE_SIZE - 1);
 631                         set_bh_page(bh, page, off);
 632                         ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 633                         wait_on_buffer(bh);
 634                         if (!buffer_uptodate(bh)) {
 635                                 err = -EIO;
 636                                 goto out;
 637                         }
 638                         zero_user_segment(page, off + voff, off + block_size);
 639                 }
 640         }
 641
 642         if (bh->b_size > bytes)
 643                 bh->b_size = bytes;
 644
 645 #ifndef __LP64__
 646         if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
 647                 static_assert(sizeof(size_t) < sizeof(loff_t));
 648                 if (bytes > 0x40000000u)
 649                         bh->b_size = 0x40000000u;
 650         }
 651 #endif
 652
 653         return 0;
 654
 655 out:
 656         return err;
 657 }
 658
 659 int ntfs_get_block(struct inode *inode, sector_t vbn,
 660                    struct buffer_head *bh_result, int create)
 661 {
 662         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 663                                   bh_result, create, GET_BLOCK_GENERAL);
 664 }
 665
 666 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
 667                                struct buffer_head *bh_result, int create)
 668 {
 669         return ntfs_get_block_vbo(inode,
 670                                   (u64)vsn << inode->i_sb->s_blocksize_bits,
 671                                   bh_result, create, GET_BLOCK_BMAP);
 672 }
 673
 674 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
 675 {
 676         return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
 677 }
 678
 679 static int ntfs_readpage(struct file *file, struct page *page)
 680 {
 681         int err;
 682         struct address_space *mapping = page->mapping;
 683         struct inode *inode = mapping->host;
 684         struct ntfs_inode *ni = ntfs_i(inode);
 685
 686         if (is_resident(ni)) {
 687                 ni_lock(ni);
 688                 err = attr_data_read_resident(ni, page);
 689                 ni_unlock(ni);
 690                 if (err != E_NTFS_NONRESIDENT) {
 691                         unlock_page(page);
 692                         return err;
 693                 }
 694         }
 695
 696         if (is_compressed(ni)) {
 697                 ni_lock(ni);
 698                 err = ni_readpage_cmpr(ni, page);
 699                 ni_unlock(ni);
 700                 return err;
 701         }
 702
 703         /* Normal + sparse files. */
 704         return mpage_readpage(page, ntfs_get_block);
 705 }
 706
 707 static void ntfs_readahead(struct readahead_control *rac)
 708 {
 709         struct address_space *mapping = rac->mapping;
 710         struct inode *inode = mapping->host;
 711         struct ntfs_inode *ni = ntfs_i(inode);
 712         u64 valid;
 713         loff_t pos;
 714
 715         if (is_resident(ni)) {
 716                 /* No readahead for resident. */
 717                 return;
 718         }
 719
 720         if (is_compressed(ni)) {
 721                 /* No readahead for compressed. */
 722                 return;
 723         }
 724
 725         valid = ni->i_valid;
 726         pos = readahead_pos(rac);
 727
 728         if (valid < i_size_read(inode) && pos <= valid &&
 729             valid < pos + readahead_length(rac)) {
 730                 /* Range cross 'valid'. Read it page by page. */
 731                 return;
 732         }
 733
 734         mpage_readahead(rac, ntfs_get_block);
 735 }
 736
 737 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
 738                                       struct buffer_head *bh_result, int create)
 739 {
 740         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 741                                   bh_result, create, GET_BLOCK_DIRECT_IO_R);
 742 }
 743
 744 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
 745                                       struct buffer_head *bh_result, int create)
 746 {
 747         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 748                                   bh_result, create, GET_BLOCK_DIRECT_IO_W);
 749 }
 750
 751 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 752 {
 753         struct file *file = iocb->ki_filp;
 754         struct address_space *mapping = file->f_mapping;
 755         struct inode *inode = mapping->host;
 756         struct ntfs_inode *ni = ntfs_i(inode);
 757         loff_t vbo = iocb->ki_pos;
 758         loff_t end;
 759         int wr = iov_iter_rw(iter) & WRITE;
 760         size_t iter_count = iov_iter_count(iter);
 761         loff_t valid;
 762         ssize_t ret;
 763
 764         if (is_resident(ni)) {
 765                 /* Switch to buffered write. */
 766                 ret = 0;
 767                 goto out;
 768         }
 769
 770         ret = blockdev_direct_IO(iocb, inode, iter,
 771                                  wr ? ntfs_get_block_direct_IO_W
 772                                     : ntfs_get_block_direct_IO_R);
 773
 774         if (ret > 0)
 775                 end = vbo + ret;
 776         else if (wr && ret == -EIOCBQUEUED)
 777                 end = vbo + iter_count;
 778         else
 779                 goto out;
 780
 781         valid = ni->i_valid;
 782         if (wr) {
 783                 if (end > valid && !S_ISBLK(inode->i_mode)) {
 784                         ni->i_valid = end;
 785                         mark_inode_dirty(inode);
 786                 }
 787         } else if (vbo < valid && valid < end) {
 788                 /* Fix page. */
 789                 iov_iter_revert(iter, end - valid);
 790                 iov_iter_zero(end - valid, iter);
 791         }
 792
 793 out:
 794         return ret;
 795 }
 796
 797 int ntfs_set_size(struct inode *inode, u64 new_size)
 798 {
 799         struct super_block *sb = inode->i_sb;
 800         struct ntfs_sb_info *sbi = sb->s_fs_info;
 801         struct ntfs_inode *ni = ntfs_i(inode);
 802         int err;
 803
 804         /* Check for maximum file size. */
 805         if (is_sparsed(ni) || is_compressed(ni)) {
 806                 if (new_size > sbi->maxbytes_sparse) {
 807                         err = -EFBIG;
 808                         goto out;
 809                 }
 810         } else if (new_size > sbi->maxbytes) {
 811                 err = -EFBIG;
 812                 goto out;
 813         }
 814
 815         ni_lock(ni);
 816         down_write(&ni->file.run_lock);
 817
 818         err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 819                             &ni->i_valid, true, NULL);
 820
 821         up_write(&ni->file.run_lock);
 822         ni_unlock(ni);
 823
 824         mark_inode_dirty(inode);
 825
 826 out:
 827         return err;
 828 }
 829
 830 static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
 831 {
 832         struct address_space *mapping = page->mapping;
 833         struct inode *inode = mapping->host;
 834         struct ntfs_inode *ni = ntfs_i(inode);
 835         int err;
 836
 837         if (is_resident(ni)) {
 838                 ni_lock(ni);
 839                 err = attr_data_write_resident(ni, page);
 840                 ni_unlock(ni);
 841                 if (err != E_NTFS_NONRESIDENT) {
 842                         unlock_page(page);
 843                         return err;
 844                 }
 845         }
 846
 847         return block_write_full_page(page, ntfs_get_block, wbc);
 848 }
 849
 850 static int ntfs_writepages(struct address_space *mapping,
 851                            struct writeback_control *wbc)
 852 {
 853         struct inode *inode = mapping->host;
 854         struct ntfs_inode *ni = ntfs_i(inode);
 855         /* Redirect call to 'ntfs_writepage' for resident files. */
 856         get_block_t *get_block = is_resident(ni) ? NULL : &ntfs_get_block;
 857
 858         return mpage_writepages(mapping, wbc, get_block);
 859 }
 860
 861 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
 862                                       struct buffer_head *bh_result, int create)
 863 {
 864         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 865                                   bh_result, create, GET_BLOCK_WRITE_BEGIN);
 866 }
 867
 868 static int ntfs_write_begin(struct file *file, struct address_space *mapping,
 869                             loff_t pos, u32 len, u32 flags, struct page **pagep,
 870                             void **fsdata)
 871 {
 872         int err;
 873         struct inode *inode = mapping->host;
 874         struct ntfs_inode *ni = ntfs_i(inode);
 875
 876         *pagep = NULL;
 877         if (is_resident(ni)) {
 878                 struct page *page = grab_cache_page_write_begin(
 879                         mapping, pos >> PAGE_SHIFT, flags);
 880
 881                 if (!page) {
 882                         err = -ENOMEM;
 883                         goto out;
 884                 }
 885
 886                 ni_lock(ni);
 887                 err = attr_data_read_resident(ni, page);
 888                 ni_unlock(ni);
 889
 890                 if (!err) {
 891                         *pagep = page;
 892                         goto out;
 893                 }
 894                 unlock_page(page);
 895                 put_page(page);
 896
 897                 if (err != E_NTFS_NONRESIDENT)
 898                         goto out;
 899         }
 900
 901         err = block_write_begin(mapping, pos, len, flags, pagep,
 902                                 ntfs_get_block_write_begin);
 903
 904 out:
 905         return err;
 906 }
 907
 908 /*
 909  * ntfs_write_end - Address_space_operations::write_end.
 910  */
 911 static int ntfs_write_end(struct file *file, struct address_space *mapping,
 912                           loff_t pos, u32 len, u32 copied, struct page *page,
 913                           void *fsdata)
 914
 915 {
 916         struct inode *inode = mapping->host;
 917         struct ntfs_inode *ni = ntfs_i(inode);
 918         u64 valid = ni->i_valid;
 919         bool dirty = false;
 920         int err;
 921
 922         if (is_resident(ni)) {
 923                 ni_lock(ni);
 924                 err = attr_data_write_resident(ni, page);
 925                 ni_unlock(ni);
 926                 if (!err) {
 927                         dirty = true;
 928                         /* Clear any buffers in page. */
 929                         if (page_has_buffers(page)) {
 930                                 struct buffer_head *head, *bh;
 931
 932                                 bh = head = page_buffers(page);
 933                                 do {
 934                                         clear_buffer_dirty(bh);
 935                                         clear_buffer_mapped(bh);
 936                                         set_buffer_uptodate(bh);
 937                                 } while (head != (bh = bh->b_this_page));
 938                         }
 939                         SetPageUptodate(page);
 940                         err = copied;
 941                 }
 942                 unlock_page(page);
 943                 put_page(page);
 944         } else {
 945                 err = generic_write_end(file, mapping, pos, len, copied, page,
 946                                         fsdata);
 947         }
 948
 949         if (err >= 0) {
 950                 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
 951                         inode->i_ctime = inode->i_mtime = current_time(inode);
 952                         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 953                         dirty = true;
 954                 }
 955
 956                 if (valid != ni->i_valid) {
 957                         /* ni->i_valid is changed in ntfs_get_block_vbo. */
 958                         dirty = true;
 959                 }
 960
 961                 if (dirty)
 962                         mark_inode_dirty(inode);
 963         }
 964
 965         return err;
 966 }
 967
 968 int reset_log_file(struct inode *inode)
 969 {
 970         int err;
 971         loff_t pos = 0;
 972         u32 log_size = inode->i_size;
 973         struct address_space *mapping = inode->i_mapping;
 974
 975         for (;;) {
 976                 u32 len;
 977                 void *kaddr;
 978                 struct page *page;
 979
 980                 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
 981
 982                 err = block_write_begin(mapping, pos, len, 0, &page,
 983                                         ntfs_get_block_write_begin);
 984                 if (err)
 985                         goto out;
 986
 987                 kaddr = kmap_atomic(page);
 988                 memset(kaddr, -1, len);
 989                 kunmap_atomic(kaddr);
 990                 flush_dcache_page(page);
 991
 992                 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
 993                 if (err < 0)
 994                         goto out;
 995                 pos += len;
 996
 997                 if (pos >= log_size)
 998                         break;
 999                 balance_dirty_pages_ratelimited(mapping);
1000         }
1001 out:
1002         mark_inode_dirty_sync(inode);
1003
1004         return err;
1005 }
1006
1007 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1008 {
1009         return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1010 }
1011
1012 int ntfs_sync_inode(struct inode *inode)
1013 {
1014         return _ni_write_inode(inode, 1);
1015 }
1016
1017 /*
1018  * writeback_inode - Helper function for ntfs_flush_inodes().
1019  *
1020  * This writes both the inode and the file data blocks, waiting
1021  * for in flight data blocks before the start of the call.  It
1022  * does not wait for any io started during the call.
1023  */
1024 static int writeback_inode(struct inode *inode)
1025 {
1026         int ret = sync_inode_metadata(inode, 0);
1027
1028         if (!ret)
1029                 ret = filemap_fdatawrite(inode->i_mapping);
1030         return ret;
1031 }
1032
1033 /*
1034  * ntfs_flush_inodes
1035  *
1036  * Write data and metadata corresponding to i1 and i2.  The io is
1037  * started but we do not wait for any of it to finish.
1038  *
1039  * filemap_flush() is used for the block device, so if there is a dirty
1040  * page for a block already in flight, we will not wait and start the
1041  * io over again.
1042  */
1043 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1044                       struct inode *i2)
1045 {
1046         int ret = 0;
1047
1048         if (i1)
1049                 ret = writeback_inode(i1);
1050         if (!ret && i2)
1051                 ret = writeback_inode(i2);
1052         if (!ret)
1053                 ret = sync_blockdev_nowait(sb->s_bdev);
1054         return ret;
1055 }
1056
1057 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1058 {
1059         pgoff_t idx;
1060
1061         /* Write non resident data. */
1062         for (idx = 0; bytes; idx++) {
1063                 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1064                 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1065
1066                 if (IS_ERR(page))
1067                         return PTR_ERR(page);
1068
1069                 lock_page(page);
1070                 WARN_ON(!PageUptodate(page));
1071                 ClearPageUptodate(page);
1072
1073                 memcpy(page_address(page), data, op);
1074
1075                 flush_dcache_page(page);
1076                 SetPageUptodate(page);
1077                 unlock_page(page);
1078
1079                 ntfs_unmap_page(page);
1080
1081                 bytes -= op;
1082                 data = Add2Ptr(data, PAGE_SIZE);
1083         }
1084         return 0;
1085 }
1086
1087 /*
1088  * ntfs_reparse_bytes
1089  *
1090  * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1091  * for unicode string of @uni_len length.
1092  */
1093 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1094 {
1095         /* Header + unicode string + decorated unicode string. */
1096         return sizeof(short) * (2 * uni_len + 4) +
1097                offsetof(struct REPARSE_DATA_BUFFER,
1098                         SymbolicLinkReparseBuffer.PathBuffer);
1099 }
1100
1101 static struct REPARSE_DATA_BUFFER *
1102 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1103                            u32 size, u16 *nsize)
1104 {
1105         int i, err;
1106         struct REPARSE_DATA_BUFFER *rp;
1107         __le16 *rp_name;
1108         typeof(rp->SymbolicLinkReparseBuffer) *rs;
1109
1110         rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1111         if (!rp)
1112                 return ERR_PTR(-ENOMEM);
1113
1114         rs = &rp->SymbolicLinkReparseBuffer;
1115         rp_name = rs->PathBuffer;
1116
1117         /* Convert link name to UTF-16. */
1118         err = ntfs_nls_to_utf16(sbi, symname, size,
1119                                 (struct cpu_str *)(rp_name - 1), 2 * size,
1120                                 UTF16_LITTLE_ENDIAN);
1121         if (err < 0)
1122                 goto out;
1123
1124         /* err = the length of unicode name of symlink. */
1125         *nsize = ntfs_reparse_bytes(err);
1126
1127         if (*nsize > sbi->reparse.max_size) {
1128                 err = -EFBIG;
1129                 goto out;
1130         }
1131
1132         /* Translate Linux '/' into Windows '\'. */
1133         for (i = 0; i < err; i++) {
1134                 if (rp_name[i] == cpu_to_le16('/'))
1135                         rp_name[i] = cpu_to_le16('\\');
1136         }
1137
1138         rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1139         rp->ReparseDataLength =
1140                 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1141                                               SymbolicLinkReparseBuffer));
1142
1143         /* PrintName + SubstituteName. */
1144         rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1145         rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1146         rs->PrintNameLength = rs->SubstituteNameOffset;
1147
1148         /*
1149          * TODO: Use relative path if possible to allow Windows to
1150          * parse this path.
1151          * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1152          */
1153         rs->Flags = 0;
1154
1155         memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1156
1157         /* Decorate SubstituteName. */
1158         rp_name += err;
1159         rp_name[0] = cpu_to_le16('\\');
1160         rp_name[1] = cpu_to_le16('?');
1161         rp_name[2] = cpu_to_le16('?');
1162         rp_name[3] = cpu_to_le16('\\');
1163
1164         return rp;
1165 out:
1166         kfree(rp);
1167         return ERR_PTR(err);
1168 }
1169
1170 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
1171                                 struct inode *dir, struct dentry *dentry,
1172                                 const struct cpu_str *uni, umode_t mode,
1173                                 dev_t dev, const char *symname, u32 size,
1174                                 struct ntfs_fnd *fnd)
1175 {
1176         int err;
1177         struct super_block *sb = dir->i_sb;
1178         struct ntfs_sb_info *sbi = sb->s_fs_info;
1179         const struct qstr *name = &dentry->d_name;
1180         CLST ino = 0;
1181         struct ntfs_inode *dir_ni = ntfs_i(dir);
1182         struct ntfs_inode *ni = NULL;
1183         struct inode *inode = NULL;
1184         struct ATTRIB *attr;
1185         struct ATTR_STD_INFO5 *std5;
1186         struct ATTR_FILE_NAME *fname;
1187         struct MFT_REC *rec;
1188         u32 asize, dsize, sd_size;
1189         enum FILE_ATTRIBUTE fa;
1190         __le32 security_id = SECURITY_ID_INVALID;
1191         CLST vcn;
1192         const void *sd;
1193         u16 t16, nsize = 0, aid = 0;
1194         struct INDEX_ROOT *root, *dir_root;
1195         struct NTFS_DE *e, *new_de = NULL;
1196         struct REPARSE_DATA_BUFFER *rp = NULL;
1197         bool rp_inserted = false;
1198
1199         ni_lock_dir(dir_ni);
1200
1201         dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1202         if (!dir_root) {
1203                 err = -EINVAL;
1204                 goto out1;
1205         }
1206
1207         if (S_ISDIR(mode)) {
1208                 /* Use parent's directory attributes. */
1209                 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1210                      FILE_ATTRIBUTE_ARCHIVE;
1211                 /*
1212                  * By default child directory inherits parent attributes.
1213                  * Root directory is hidden + system.
1214                  * Make an exception for children in root.
1215                  */
1216                 if (dir->i_ino == MFT_REC_ROOT)
1217                         fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1218         } else if (S_ISLNK(mode)) {
1219                 /* It is good idea that link should be the same type (file/dir) as target */
1220                 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1221
1222                 /*
1223                  * Linux: there are dir/file/symlink and so on.
1224                  * NTFS: symlinks are "dir + reparse" or "file + reparse"
1225                  * It is good idea to create:
1226                  * dir + reparse if 'symname' points to directory
1227                  * or
1228                  * file + reparse if 'symname' points to file
1229                  * Unfortunately kern_path hangs if symname contains 'dir'.
1230                  */
1231
1232                 /*
1233                  *      struct path path;
1234                  *
1235                  *      if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1236                  *              struct inode *target = d_inode(path.dentry);
1237                  *
1238                  *              if (S_ISDIR(target->i_mode))
1239                  *                      fa |= FILE_ATTRIBUTE_DIRECTORY;
1240                  *              // if ( target->i_sb == sb ){
1241                  *              //      use relative path?
1242                  *              // }
1243                  *              path_put(&path);
1244                  *      }
1245                  */
1246         } else if (S_ISREG(mode)) {
1247                 if (sbi->options->sparse) {
1248                         /* Sparsed regular file, cause option 'sparse'. */
1249                         fa = FILE_ATTRIBUTE_SPARSE_FILE |
1250                              FILE_ATTRIBUTE_ARCHIVE;
1251                 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1252                         /* Compressed regular file, if parent is compressed. */
1253                         fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1254                 } else {
1255                         /* Regular file, default attributes. */
1256                         fa = FILE_ATTRIBUTE_ARCHIVE;
1257                 }
1258         } else {
1259                 fa = FILE_ATTRIBUTE_ARCHIVE;
1260         }
1261
1262         if (!(mode & 0222))
1263                 fa |= FILE_ATTRIBUTE_READONLY;
1264
1265         /* Allocate PATH_MAX bytes. */
1266         new_de = __getname();
1267         if (!new_de) {
1268                 err = -ENOMEM;
1269                 goto out1;
1270         }
1271
1272         /* Mark rw ntfs as dirty. it will be cleared at umount. */
1273         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1274
1275         /* Step 1: allocate and fill new mft record. */
1276         err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1277         if (err)
1278                 goto out2;
1279
1280         ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY);
1281         if (IS_ERR(ni)) {
1282                 err = PTR_ERR(ni);
1283                 ni = NULL;
1284                 goto out3;
1285         }
1286         inode = &ni->vfs_inode;
1287         inode_init_owner(mnt_userns, inode, dir, mode);
1288         mode = inode->i_mode;
1289
1290         inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
1291                 current_time(inode);
1292
1293         rec = ni->mi.mrec;
1294         rec->hard_links = cpu_to_le16(1);
1295         attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1296
1297         /* Get default security id. */
1298         sd = s_default_security;
1299         sd_size = sizeof(s_default_security);
1300
1301         if (is_ntfs3(sbi)) {
1302                 security_id = dir_ni->std_security_id;
1303                 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1304                         security_id = sbi->security.def_security_id;
1305
1306                         if (security_id == SECURITY_ID_INVALID &&
1307                             !ntfs_insert_security(sbi, sd, sd_size,
1308                                                   &security_id, NULL))
1309                                 sbi->security.def_security_id = security_id;
1310                 }
1311         }
1312
1313         /* Insert standard info. */
1314         std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1315
1316         if (security_id == SECURITY_ID_INVALID) {
1317                 dsize = sizeof(struct ATTR_STD_INFO);
1318         } else {
1319                 dsize = sizeof(struct ATTR_STD_INFO5);
1320                 std5->security_id = security_id;
1321                 ni->std_security_id = security_id;
1322         }
1323         asize = SIZEOF_RESIDENT + dsize;
1324
1325         attr->type = ATTR_STD;
1326         attr->size = cpu_to_le32(asize);
1327         attr->id = cpu_to_le16(aid++);
1328         attr->res.data_off = SIZEOF_RESIDENT_LE;
1329         attr->res.data_size = cpu_to_le32(dsize);
1330
1331         std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1332                 kernel2nt(&inode->i_atime);
1333
1334         ni->std_fa = fa;
1335         std5->fa = fa;
1336
1337         attr = Add2Ptr(attr, asize);
1338
1339         /* Insert file name. */
1340         err = fill_name_de(sbi, new_de, name, uni);
1341         if (err)
1342                 goto out4;
1343
1344         mi_get_ref(&ni->mi, &new_de->ref);
1345
1346         fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1347         mi_get_ref(&dir_ni->mi, &fname->home);
1348         fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1349                 fname->dup.a_time = std5->cr_time;
1350         fname->dup.alloc_size = fname->dup.data_size = 0;
1351         fname->dup.fa = std5->fa;
1352         fname->dup.ea_size = fname->dup.reparse = 0;
1353
1354         dsize = le16_to_cpu(new_de->key_size);
1355         asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1356
1357         attr->type = ATTR_NAME;
1358         attr->size = cpu_to_le32(asize);
1359         attr->res.data_off = SIZEOF_RESIDENT_LE;
1360         attr->res.flags = RESIDENT_FLAG_INDEXED;
1361         attr->id = cpu_to_le16(aid++);
1362         attr->res.data_size = cpu_to_le32(dsize);
1363         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1364
1365         attr = Add2Ptr(attr, asize);
1366
1367         if (security_id == SECURITY_ID_INVALID) {
1368                 /* Insert security attribute. */
1369                 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1370
1371                 attr->type = ATTR_SECURE;
1372                 attr->size = cpu_to_le32(asize);
1373                 attr->id = cpu_to_le16(aid++);
1374                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1375                 attr->res.data_size = cpu_to_le32(sd_size);
1376                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1377
1378                 attr = Add2Ptr(attr, asize);
1379         }
1380
1381         attr->id = cpu_to_le16(aid++);
1382         if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1383                 /*
1384                  * Regular directory or symlink to directory.
1385                  * Create root attribute.
1386                  */
1387                 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1388                 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1389
1390                 attr->type = ATTR_ROOT;
1391                 attr->size = cpu_to_le32(asize);
1392
1393                 attr->name_len = ARRAY_SIZE(I30_NAME);
1394                 attr->name_off = SIZEOF_RESIDENT_LE;
1395                 attr->res.data_off =
1396                         cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1397                 attr->res.data_size = cpu_to_le32(dsize);
1398                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1399                        sizeof(I30_NAME));
1400
1401                 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1402                 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1403                 root->ihdr.de_off =
1404                         cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10
1405                 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1406                                               sizeof(struct NTFS_DE));
1407                 root->ihdr.total = root->ihdr.used;
1408
1409                 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1410                 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1411                 e->flags = NTFS_IE_LAST;
1412         } else if (S_ISLNK(mode)) {
1413                 /*
1414                  * Symlink to file.
1415                  * Create empty resident data attribute.
1416                  */
1417                 asize = SIZEOF_RESIDENT;
1418
1419                 /* Insert empty ATTR_DATA */
1420                 attr->type = ATTR_DATA;
1421                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1422                 attr->name_off = SIZEOF_RESIDENT_LE;
1423                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1424         } else if (S_ISREG(mode)) {
1425                 /*
1426                  * Regular file. Create empty non resident data attribute.
1427                  */
1428                 attr->type = ATTR_DATA;
1429                 attr->non_res = 1;
1430                 attr->nres.evcn = cpu_to_le64(-1ll);
1431                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1432                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1433                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1434                         attr->flags = ATTR_FLAG_SPARSED;
1435                         asize = SIZEOF_NONRESIDENT_EX + 8;
1436                 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1437                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1438                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1439                         attr->flags = ATTR_FLAG_COMPRESSED;
1440                         attr->nres.c_unit = COMPRESSION_UNIT;
1441                         asize = SIZEOF_NONRESIDENT_EX + 8;
1442                 } else {
1443                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1444                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1445                         asize = SIZEOF_NONRESIDENT + 8;
1446                 }
1447                 attr->nres.run_off = attr->name_off;
1448         } else {
1449                 /*
1450                  * Node. Create empty resident data attribute.
1451                  */
1452                 attr->type = ATTR_DATA;
1453                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1454                 attr->name_off = SIZEOF_RESIDENT_LE;
1455                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1456                         attr->flags = ATTR_FLAG_SPARSED;
1457                 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1458                         attr->flags = ATTR_FLAG_COMPRESSED;
1459                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1460                 asize = SIZEOF_RESIDENT;
1461                 ni->ni_flags |= NI_FLAG_RESIDENT;
1462         }
1463
1464         if (S_ISDIR(mode)) {
1465                 ni->ni_flags |= NI_FLAG_DIR;
1466                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1467                 if (err)
1468                         goto out4;
1469         } else if (S_ISLNK(mode)) {
1470                 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1471
1472                 if (IS_ERR(rp)) {
1473                         err = PTR_ERR(rp);
1474                         rp = NULL;
1475                         goto out4;
1476                 }
1477
1478                 /*
1479                  * Insert ATTR_REPARSE.
1480                  */
1481                 attr = Add2Ptr(attr, asize);
1482                 attr->type = ATTR_REPARSE;
1483                 attr->id = cpu_to_le16(aid++);
1484
1485                 /* Resident or non resident? */
1486                 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1487                 t16 = PtrOffset(rec, attr);
1488
1489                 /*
1490                  * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1491                  * It is good idea to keep extened attributes resident.
1492                  */
1493                 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1494                         CLST alen;
1495                         CLST clst = bytes_to_cluster(sbi, nsize);
1496
1497                         /* Bytes per runs. */
1498                         t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1499
1500                         attr->non_res = 1;
1501                         attr->nres.evcn = cpu_to_le64(clst - 1);
1502                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1503                         attr->nres.run_off = attr->name_off;
1504                         attr->nres.data_size = cpu_to_le64(nsize);
1505                         attr->nres.valid_size = attr->nres.data_size;
1506                         attr->nres.alloc_size =
1507                                 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1508
1509                         err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1510                                                      clst, NULL, 0, &alen, 0,
1511                                                      NULL);
1512                         if (err)
1513                                 goto out5;
1514
1515                         err = run_pack(&ni->file.run, 0, clst,
1516                                        Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1517                                        &vcn);
1518                         if (err < 0)
1519                                 goto out5;
1520
1521                         if (vcn != clst) {
1522                                 err = -EINVAL;
1523                                 goto out5;
1524                         }
1525
1526                         asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1527                 } else {
1528                         attr->res.data_off = SIZEOF_RESIDENT_LE;
1529                         attr->res.data_size = cpu_to_le32(nsize);
1530                         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1531                         nsize = 0;
1532                 }
1533                 /* Size of symlink equals the length of input string. */
1534                 inode->i_size = size;
1535
1536                 attr->size = cpu_to_le32(asize);
1537
1538                 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1539                                           &new_de->ref);
1540                 if (err)
1541                         goto out5;
1542
1543                 rp_inserted = true;
1544         }
1545
1546         attr = Add2Ptr(attr, asize);
1547         attr->type = ATTR_END;
1548
1549         rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1550         rec->next_attr_id = cpu_to_le16(aid);
1551
1552         /* Step 2: Add new name in index. */
1553         err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1554         if (err)
1555                 goto out6;
1556
1557         /* Unlock parent directory before ntfs_init_acl. */
1558         ni_unlock(dir_ni);
1559
1560         inode->i_generation = le16_to_cpu(rec->seq);
1561
1562         dir->i_mtime = dir->i_ctime = inode->i_atime;
1563
1564         if (S_ISDIR(mode)) {
1565                 inode->i_op = &ntfs_dir_inode_operations;
1566                 inode->i_fop = &ntfs_dir_operations;
1567         } else if (S_ISLNK(mode)) {
1568                 inode->i_op = &ntfs_link_inode_operations;
1569                 inode->i_fop = NULL;
1570                 inode->i_mapping->a_ops = &ntfs_aops;
1571                 inode->i_size = size;
1572                 inode_nohighmem(inode);
1573         } else if (S_ISREG(mode)) {
1574                 inode->i_op = &ntfs_file_inode_operations;
1575                 inode->i_fop = &ntfs_file_operations;
1576                 inode->i_mapping->a_ops =
1577                         is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
1578                 init_rwsem(&ni->file.run_lock);
1579         } else {
1580                 inode->i_op = &ntfs_special_inode_operations;
1581                 init_special_inode(inode, mode, dev);
1582         }
1583
1584 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1585         if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1586                 err = ntfs_init_acl(mnt_userns, inode, dir);
1587                 if (err)
1588                         goto out7;
1589         } else
1590 #endif
1591         {
1592                 inode->i_flags |= S_NOSEC;
1593         }
1594
1595         /* Write non resident data. */
1596         if (nsize) {
1597                 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0);
1598                 if (err)
1599                         goto out7;
1600         }
1601
1602         /*
1603          * Call 'd_instantiate' after inode->i_op is set
1604          * but before finish_open.
1605          */
1606         d_instantiate(dentry, inode);
1607
1608         ntfs_save_wsl_perm(inode);
1609         mark_inode_dirty(dir);
1610         mark_inode_dirty(inode);
1611
1612         /* Normal exit. */
1613         goto out2;
1614
1615 out7:
1616
1617         /* Undo 'indx_insert_entry'. */
1618         ni_lock_dir(dir_ni);
1619         indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
1620                           le16_to_cpu(new_de->key_size), sbi);
1621         /* ni_unlock(dir_ni); will be called later. */
1622 out6:
1623         if (rp_inserted)
1624                 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1625
1626 out5:
1627         if (S_ISDIR(mode) || run_is_empty(&ni->file.run))
1628                 goto out4;
1629
1630         run_deallocate(sbi, &ni->file.run, false);
1631
1632 out4:
1633         clear_rec_inuse(rec);
1634         clear_nlink(inode);
1635         ni->mi.dirty = false;
1636         discard_new_inode(inode);
1637 out3:
1638         ntfs_mark_rec_free(sbi, ino);
1639
1640 out2:
1641         __putname(new_de);
1642         kfree(rp);
1643
1644 out1:
1645         if (err) {
1646                 ni_unlock(dir_ni);
1647                 return ERR_PTR(err);
1648         }
1649
1650         unlock_new_inode(inode);
1651
1652         return inode;
1653 }
1654
1655 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1656 {
1657         int err;
1658         struct ntfs_inode *ni = ntfs_i(inode);
1659         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1660         struct NTFS_DE *de;
1661         struct ATTR_FILE_NAME *de_name;
1662
1663         /* Allocate PATH_MAX bytes. */
1664         de = __getname();
1665         if (!de)
1666                 return -ENOMEM;
1667
1668         /* Mark rw ntfs as dirty. It will be cleared at umount. */
1669         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1670
1671         /* Construct 'de'. */
1672         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1673         if (err)
1674                 goto out;
1675
1676         de_name = (struct ATTR_FILE_NAME *)(de + 1);
1677         /* Fill duplicate info. */
1678         de_name->dup.cr_time = de_name->dup.m_time = de_name->dup.c_time =
1679                 de_name->dup.a_time = kernel2nt(&inode->i_ctime);
1680         de_name->dup.alloc_size = de_name->dup.data_size =
1681                 cpu_to_le64(inode->i_size);
1682         de_name->dup.fa = ni->std_fa;
1683         de_name->dup.ea_size = de_name->dup.reparse = 0;
1684
1685         err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1686 out:
1687         __putname(de);
1688         return err;
1689 }
1690
1691 /*
1692  * ntfs_unlink_inode
1693  *
1694  * inode_operations::unlink
1695  * inode_operations::rmdir
1696  */
1697 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1698 {
1699         int err;
1700         struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1701         struct inode *inode = d_inode(dentry);
1702         struct ntfs_inode *ni = ntfs_i(inode);
1703         struct ntfs_inode *dir_ni = ntfs_i(dir);
1704         struct NTFS_DE *de, *de2 = NULL;
1705         int undo_remove;
1706
1707         if (ntfs_is_meta_file(sbi, ni->mi.rno))
1708                 return -EINVAL;
1709
1710         /* Allocate PATH_MAX bytes. */
1711         de = __getname();
1712         if (!de)
1713                 return -ENOMEM;
1714
1715         ni_lock(ni);
1716
1717         if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1718                 err = -ENOTEMPTY;
1719                 goto out;
1720         }
1721
1722         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1723         if (err < 0)
1724                 goto out;
1725
1726         undo_remove = 0;
1727         err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1728
1729         if (!err) {
1730                 drop_nlink(inode);
1731                 dir->i_mtime = dir->i_ctime = current_time(dir);
1732                 mark_inode_dirty(dir);
1733                 inode->i_ctime = dir->i_ctime;
1734                 if (inode->i_nlink)
1735                         mark_inode_dirty(inode);
1736         } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1737                 make_bad_inode(inode);
1738                 ntfs_inode_err(inode, "failed to undo unlink");
1739                 ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
1740         } else {
1741                 if (ni_is_dirty(dir))
1742                         mark_inode_dirty(dir);
1743                 if (ni_is_dirty(inode))
1744                         mark_inode_dirty(inode);
1745         }
1746
1747 out:
1748         ni_unlock(ni);
1749         __putname(de);
1750         return err;
1751 }
1752
1753 void ntfs_evict_inode(struct inode *inode)
1754 {
1755         truncate_inode_pages_final(&inode->i_data);
1756
1757         if (inode->i_nlink)
1758                 _ni_write_inode(inode, inode_needs_sync(inode));
1759
1760         invalidate_inode_buffers(inode);
1761         clear_inode(inode);
1762
1763         ni_clear(ntfs_i(inode));
1764 }
1765
1766 static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer,
1767                                       int buflen)
1768 {
1769         int i, err = -EINVAL;
1770         struct ntfs_inode *ni = ntfs_i(inode);
1771         struct super_block *sb = inode->i_sb;
1772         struct ntfs_sb_info *sbi = sb->s_fs_info;
1773         u64 size;
1774         u16 ulen = 0;
1775         void *to_free = NULL;
1776         struct REPARSE_DATA_BUFFER *rp;
1777         const __le16 *uname;
1778         struct ATTRIB *attr;
1779
1780         /* Reparse data present. Try to parse it. */
1781         static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1782         static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1783
1784         *buffer = 0;
1785
1786         attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1787         if (!attr)
1788                 goto out;
1789
1790         if (!attr->non_res) {
1791                 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1792                 if (!rp)
1793                         goto out;
1794                 size = le32_to_cpu(attr->res.data_size);
1795         } else {
1796                 size = le64_to_cpu(attr->nres.data_size);
1797                 rp = NULL;
1798         }
1799
1800         if (size > sbi->reparse.max_size || size <= sizeof(u32))
1801                 goto out;
1802
1803         if (!rp) {
1804                 rp = kmalloc(size, GFP_NOFS);
1805                 if (!rp) {
1806                         err = -ENOMEM;
1807                         goto out;
1808                 }
1809                 to_free = rp;
1810                 /* Read into temporal buffer. */
1811                 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1812                 if (err)
1813                         goto out;
1814         }
1815
1816         /* Microsoft Tag. */
1817         switch (rp->ReparseTag) {
1818         case IO_REPARSE_TAG_MOUNT_POINT:
1819                 /* Mount points and junctions. */
1820                 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1821                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1822                                      MountPointReparseBuffer.PathBuffer))
1823                         goto out;
1824                 uname = Add2Ptr(rp,
1825                                 offsetof(struct REPARSE_DATA_BUFFER,
1826                                          MountPointReparseBuffer.PathBuffer) +
1827                                         le16_to_cpu(rp->MountPointReparseBuffer
1828                                                             .PrintNameOffset));
1829                 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1830                 break;
1831
1832         case IO_REPARSE_TAG_SYMLINK:
1833                 /* FolderSymbolicLink */
1834                 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1835                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1836                                      SymbolicLinkReparseBuffer.PathBuffer))
1837                         goto out;
1838                 uname = Add2Ptr(
1839                         rp, offsetof(struct REPARSE_DATA_BUFFER,
1840                                      SymbolicLinkReparseBuffer.PathBuffer) +
1841                                     le16_to_cpu(rp->SymbolicLinkReparseBuffer
1842                                                         .PrintNameOffset));
1843                 ulen = le16_to_cpu(
1844                         rp->SymbolicLinkReparseBuffer.PrintNameLength);
1845                 break;
1846
1847         case IO_REPARSE_TAG_CLOUD:
1848         case IO_REPARSE_TAG_CLOUD_1:
1849         case IO_REPARSE_TAG_CLOUD_2:
1850         case IO_REPARSE_TAG_CLOUD_3:
1851         case IO_REPARSE_TAG_CLOUD_4:
1852         case IO_REPARSE_TAG_CLOUD_5:
1853         case IO_REPARSE_TAG_CLOUD_6:
1854         case IO_REPARSE_TAG_CLOUD_7:
1855         case IO_REPARSE_TAG_CLOUD_8:
1856         case IO_REPARSE_TAG_CLOUD_9:
1857         case IO_REPARSE_TAG_CLOUD_A:
1858         case IO_REPARSE_TAG_CLOUD_B:
1859         case IO_REPARSE_TAG_CLOUD_C:
1860         case IO_REPARSE_TAG_CLOUD_D:
1861         case IO_REPARSE_TAG_CLOUD_E:
1862         case IO_REPARSE_TAG_CLOUD_F:
1863                 err = sizeof("OneDrive") - 1;
1864                 if (err > buflen)
1865                         err = buflen;
1866                 memcpy(buffer, "OneDrive", err);
1867                 goto out;
1868
1869         default:
1870                 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
1871                         /* Unknown Microsoft Tag. */
1872                         goto out;
1873                 }
1874                 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
1875                     size <= sizeof(struct REPARSE_POINT)) {
1876                         goto out;
1877                 }
1878
1879                 /* Users tag. */
1880                 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
1881                 ulen = le16_to_cpu(rp->ReparseDataLength) -
1882                        sizeof(struct REPARSE_POINT);
1883         }
1884
1885         /* Convert nlen from bytes to UNICODE chars. */
1886         ulen >>= 1;
1887
1888         /* Check that name is available. */
1889         if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
1890                 goto out;
1891
1892         /* If name is already zero terminated then truncate it now. */
1893         if (!uname[ulen - 1])
1894                 ulen -= 1;
1895
1896         err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
1897
1898         if (err < 0)
1899                 goto out;
1900
1901         /* Translate Windows '\' into Linux '/'. */
1902         for (i = 0; i < err; i++) {
1903                 if (buffer[i] == '\\')
1904                         buffer[i] = '/';
1905         }
1906
1907         /* Always set last zero. */
1908         buffer[err] = 0;
1909 out:
1910         kfree(to_free);
1911         return err;
1912 }
1913
1914 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
1915                                  struct delayed_call *done)
1916 {
1917         int err;
1918         char *ret;
1919
1920         if (!de)
1921                 return ERR_PTR(-ECHILD);
1922
1923         ret = kmalloc(PAGE_SIZE, GFP_NOFS);
1924         if (!ret)
1925                 return ERR_PTR(-ENOMEM);
1926
1927         err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE);
1928         if (err < 0) {
1929                 kfree(ret);
1930                 return ERR_PTR(err);
1931         }
1932
1933         set_delayed_call(done, kfree_link, ret);
1934
1935         return ret;
1936 }
1937
1938 // clang-format off
1939 const struct inode_operations ntfs_link_inode_operations = {
1940         .get_link       = ntfs_get_link,
1941         .setattr        = ntfs3_setattr,
1942         .listxattr      = ntfs_listxattr,
1943         .permission     = ntfs_permission,
1944         .get_acl        = ntfs_get_acl,
1945         .set_acl        = ntfs_set_acl,
1946 };
1947
1948 const struct address_space_operations ntfs_aops = {
1949         .readpage       = ntfs_readpage,
1950         .readahead      = ntfs_readahead,
1951         .writepage      = ntfs_writepage,
1952         .writepages     = ntfs_writepages,
1953         .write_begin    = ntfs_write_begin,
1954         .write_end      = ntfs_write_end,
1955         .direct_IO      = ntfs_direct_IO,
1956         .bmap           = ntfs_bmap,
1957         .dirty_folio    = block_dirty_folio,
1958 };
1959
1960 const struct address_space_operations ntfs_aops_cmpr = {
1961         .readpage       = ntfs_readpage,
1962         .readahead      = ntfs_readahead,
1963 };
1964 // clang-format on