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/blkdev.h>
   9 #include <linux/buffer_head.h>
  10 #include <linux/fs.h>
  11 #include <linux/iversion.h>
  12 #include <linux/mpage.h>
  13 #include <linux/namei.h>
  14 #include <linux/nls.h>
  15 #include <linux/uio.h>
  16 #include <linux/writeback.h>
  17
  18 #include "debug.h"
  19 #include "ntfs.h"
  20 #include "ntfs_fs.h"
  21
  22 /*
  23  * ntfs_read_mft
  24  *
  25  * reads record and parses MFT
  26  */
  27 static struct inode *ntfs_read_mft(struct inode *inode,
  28                                    const struct cpu_str *name,
  29                                    const struct MFT_REF *ref)
  30 {
  31         int err = 0;
  32         struct ntfs_inode *ni = ntfs_i(inode);
  33         struct super_block *sb = inode->i_sb;
  34         struct ntfs_sb_info *sbi = sb->s_fs_info;
  35         mode_t mode = 0;
  36         struct ATTR_STD_INFO5 *std5 = NULL;
  37         struct ATTR_LIST_ENTRY *le;
  38         struct ATTRIB *attr;
  39         bool is_match = false;
  40         bool is_root = false;
  41         bool is_dir;
  42         unsigned long ino = inode->i_ino;
  43         u32 rp_fa = 0, asize, t32;
  44         u16 roff, rsize, names = 0;
  45         const struct ATTR_FILE_NAME *fname = NULL;
  46         const struct INDEX_ROOT *root;
  47         struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
  48         u64 t64;
  49         struct MFT_REC *rec;
  50         struct runs_tree *run;
  51
  52         inode->i_op = NULL;
  53         /* Setup 'uid' and 'gid' */
  54         inode->i_uid = sbi->options.fs_uid;
  55         inode->i_gid = sbi->options.fs_gid;
  56
  57         err = mi_init(&ni->mi, sbi, ino);
  58         if (err)
  59                 goto out;
  60
  61         if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
  62                 t64 = sbi->mft.lbo >> sbi->cluster_bits;
  63                 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
  64                 sbi->mft.ni = ni;
  65                 init_rwsem(&ni->file.run_lock);
  66
  67                 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
  68                         err = -ENOMEM;
  69                         goto out;
  70                 }
  71         }
  72
  73         err = mi_read(&ni->mi, ino == MFT_REC_MFT);
  74
  75         if (err)
  76                 goto out;
  77
  78         rec = ni->mi.mrec;
  79
  80         if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
  81                 ;
  82         } else if (ref->seq != rec->seq) {
  83                 err = -EINVAL;
  84                 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
  85                          le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
  86                 goto out;
  87         } else if (!is_rec_inuse(rec)) {
  88                 err = -EINVAL;
  89                 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
  90                 goto out;
  91         }
  92
  93         if (le32_to_cpu(rec->total) != sbi->record_size) {
  94                 // bad inode?
  95                 err = -EINVAL;
  96                 goto out;
  97         }
  98
  99         if (!is_rec_base(rec))
 100                 goto Ok;
 101
 102         /* record should contain $I30 root */
 103         is_dir = rec->flags & RECORD_FLAG_DIR;
 104
 105         inode->i_generation = le16_to_cpu(rec->seq);
 106
 107         /* Enumerate all struct Attributes MFT */
 108         le = NULL;
 109         attr = NULL;
 110
 111         /*
 112          * to reduce tab pressure use goto instead of
 113          * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
 114          */
 115 next_attr:
 116         run = NULL;
 117         err = -EINVAL;
 118         attr = ni_enum_attr_ex(ni, attr, &le, NULL);
 119         if (!attr)
 120                 goto end_enum;
 121
 122         if (le && le->vcn) {
 123                 /* This is non primary attribute segment. Ignore if not MFT */
 124                 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
 125                         goto next_attr;
 126
 127                 run = &ni->file.run;
 128                 asize = le32_to_cpu(attr->size);
 129                 goto attr_unpack_run;
 130         }
 131
 132         roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
 133         rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
 134         asize = le32_to_cpu(attr->size);
 135
 136         switch (attr->type) {
 137         case ATTR_STD:
 138                 if (attr->non_res ||
 139                     asize < sizeof(struct ATTR_STD_INFO) + roff ||
 140                     rsize < sizeof(struct ATTR_STD_INFO))
 141                         goto out;
 142
 143                 if (std5)
 144                         goto next_attr;
 145
 146                 std5 = Add2Ptr(attr, roff);
 147
 148 #ifdef STATX_BTIME
 149                 nt2kernel(std5->cr_time, &ni->i_crtime);
 150 #endif
 151                 nt2kernel(std5->a_time, &inode->i_atime);
 152                 nt2kernel(std5->c_time, &inode->i_ctime);
 153                 nt2kernel(std5->m_time, &inode->i_mtime);
 154
 155                 ni->std_fa = std5->fa;
 156
 157                 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
 158                     rsize >= sizeof(struct ATTR_STD_INFO5))
 159                         ni->std_security_id = std5->security_id;
 160                 goto next_attr;
 161
 162         case ATTR_LIST:
 163                 if (attr->name_len || le || ino == MFT_REC_LOG)
 164                         goto out;
 165
 166                 err = ntfs_load_attr_list(ni, attr);
 167                 if (err)
 168                         goto out;
 169
 170                 le = NULL;
 171                 attr = NULL;
 172                 goto next_attr;
 173
 174         case ATTR_NAME:
 175                 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
 176                     rsize < SIZEOF_ATTRIBUTE_FILENAME)
 177                         goto out;
 178
 179                 fname = Add2Ptr(attr, roff);
 180                 if (fname->type == FILE_NAME_DOS)
 181                         goto next_attr;
 182
 183                 names += 1;
 184                 if (name && name->len == fname->name_len &&
 185                     !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
 186                                         NULL, false))
 187                         is_match = true;
 188
 189                 goto next_attr;
 190
 191         case ATTR_DATA:
 192                 if (is_dir) {
 193                         /* ignore data attribute in dir record */
 194                         goto next_attr;
 195                 }
 196
 197                 if (ino == MFT_REC_BADCLUST && !attr->non_res)
 198                         goto next_attr;
 199
 200                 if (attr->name_len &&
 201                     ((ino != MFT_REC_BADCLUST || !attr->non_res ||
 202                       attr->name_len != ARRAY_SIZE(BAD_NAME) ||
 203                       memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
 204                      (ino != MFT_REC_SECURE || !attr->non_res ||
 205                       attr->name_len != ARRAY_SIZE(SDS_NAME) ||
 206                       memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
 207                         /* file contains stream attribute. ignore it */
 208                         goto next_attr;
 209                 }
 210
 211                 if (is_attr_sparsed(attr))
 212                         ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
 213                 else
 214                         ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
 215
 216                 if (is_attr_compressed(attr))
 217                         ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
 218                 else
 219                         ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
 220
 221                 if (is_attr_encrypted(attr))
 222                         ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
 223                 else
 224                         ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
 225
 226                 if (!attr->non_res) {
 227                         ni->i_valid = inode->i_size = rsize;
 228                         inode_set_bytes(inode, rsize);
 229                         t32 = asize;
 230                 } else {
 231                         t32 = le16_to_cpu(attr->nres.run_off);
 232                 }
 233
 234                 mode = S_IFREG | (0777 & sbi->options.fs_fmask_inv);
 235
 236                 if (!attr->non_res) {
 237                         ni->ni_flags |= NI_FLAG_RESIDENT;
 238                         goto next_attr;
 239                 }
 240
 241                 inode_set_bytes(inode, attr_ondisk_size(attr));
 242
 243                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 244                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 245                 if (!attr->nres.alloc_size)
 246                         goto next_attr;
 247
 248                 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run
 249                                             : &ni->file.run;
 250                 break;
 251
 252         case ATTR_ROOT:
 253                 if (attr->non_res)
 254                         goto out;
 255
 256                 root = Add2Ptr(attr, roff);
 257                 is_root = true;
 258
 259                 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
 260                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 261                         goto next_attr;
 262
 263                 if (root->type != ATTR_NAME ||
 264                     root->rule != NTFS_COLLATION_TYPE_FILENAME)
 265                         goto out;
 266
 267                 if (!is_dir)
 268                         goto next_attr;
 269
 270                 ni->ni_flags |= NI_FLAG_DIR;
 271
 272                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
 273                 if (err)
 274                         goto out;
 275
 276                 mode = sb->s_root
 277                                ? (S_IFDIR | (0777 & sbi->options.fs_dmask_inv))
 278                                : (S_IFDIR | 0777);
 279                 goto next_attr;
 280
 281         case ATTR_ALLOC:
 282                 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
 283                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 284                         goto next_attr;
 285
 286                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 287                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 288                 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
 289
 290                 run = &ni->dir.alloc_run;
 291                 break;
 292
 293         case ATTR_BITMAP:
 294                 if (ino == MFT_REC_MFT) {
 295                         if (!attr->non_res)
 296                                 goto out;
 297 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
 298                         /* 0x20000000 = 2^32 / 8 */
 299                         if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
 300                                 goto out;
 301 #endif
 302                         run = &sbi->mft.bitmap.run;
 303                         break;
 304                 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
 305                            !memcmp(attr_name(attr), I30_NAME,
 306                                    sizeof(I30_NAME)) &&
 307                            attr->non_res) {
 308                         run = &ni->dir.bitmap_run;
 309                         break;
 310                 }
 311                 goto next_attr;
 312
 313         case ATTR_REPARSE:
 314                 if (attr->name_len)
 315                         goto next_attr;
 316
 317                 rp_fa = ni_parse_reparse(ni, attr, &rp);
 318                 switch (rp_fa) {
 319                 case REPARSE_LINK:
 320                         if (!attr->non_res) {
 321                                 inode->i_size = rsize;
 322                                 inode_set_bytes(inode, rsize);
 323                                 t32 = asize;
 324                         } else {
 325                                 inode->i_size =
 326                                         le64_to_cpu(attr->nres.data_size);
 327                                 t32 = le16_to_cpu(attr->nres.run_off);
 328                         }
 329
 330                         /* Looks like normal symlink */
 331                         ni->i_valid = inode->i_size;
 332
 333                         /* Clear directory bit */
 334                         if (ni->ni_flags & NI_FLAG_DIR) {
 335                                 indx_clear(&ni->dir);
 336                                 memset(&ni->dir, 0, sizeof(ni->dir));
 337                                 ni->ni_flags &= ~NI_FLAG_DIR;
 338                         } else {
 339                                 run_close(&ni->file.run);
 340                         }
 341                         mode = S_IFLNK | 0777;
 342                         is_dir = false;
 343                         if (attr->non_res) {
 344                                 run = &ni->file.run;
 345                                 goto attr_unpack_run; // double break
 346                         }
 347                         break;
 348
 349                 case REPARSE_COMPRESSED:
 350                         break;
 351
 352                 case REPARSE_DEDUPLICATED:
 353                         break;
 354                 }
 355                 goto next_attr;
 356
 357         case ATTR_EA_INFO:
 358                 if (!attr->name_len &&
 359                     resident_data_ex(attr, sizeof(struct EA_INFO))) {
 360                         ni->ni_flags |= NI_FLAG_EA;
 361                         /*
 362                          * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
 363                          */
 364                         inode->i_mode = mode;
 365                         ntfs_get_wsl_perm(inode);
 366                         mode = inode->i_mode;
 367                 }
 368                 goto next_attr;
 369
 370         default:
 371                 goto next_attr;
 372         }
 373
 374 attr_unpack_run:
 375         roff = le16_to_cpu(attr->nres.run_off);
 376
 377         t64 = le64_to_cpu(attr->nres.svcn);
 378         err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
 379                             t64, Add2Ptr(attr, roff), asize - roff);
 380         if (err < 0)
 381                 goto out;
 382         err = 0;
 383         goto next_attr;
 384
 385 end_enum:
 386
 387         if (!std5)
 388                 goto out;
 389
 390         if (!is_match && name) {
 391                 /* reuse rec as buffer for ascii name */
 392                 err = -ENOENT;
 393                 goto out;
 394         }
 395
 396         if (std5->fa & FILE_ATTRIBUTE_READONLY)
 397                 mode &= ~0222;
 398
 399         if (!names) {
 400                 err = -EINVAL;
 401                 goto out;
 402         }
 403
 404         set_nlink(inode, names);
 405
 406         if (S_ISDIR(mode)) {
 407                 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
 408
 409                 /*
 410                  * dot and dot-dot should be included in count but was not
 411                  * included in enumeration.
 412                  * Usually a hard links to directories are disabled
 413                  */
 414                 inode->i_op = &ntfs_dir_inode_operations;
 415                 inode->i_fop = &ntfs_dir_operations;
 416                 ni->i_valid = 0;
 417         } else if (S_ISLNK(mode)) {
 418                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 419                 inode->i_op = &ntfs_link_inode_operations;
 420                 inode->i_fop = NULL;
 421                 inode_nohighmem(inode); // ??
 422         } else if (S_ISREG(mode)) {
 423                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 424                 inode->i_op = &ntfs_file_inode_operations;
 425                 inode->i_fop = &ntfs_file_operations;
 426                 inode->i_mapping->a_ops =
 427                         is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
 428                 if (ino != MFT_REC_MFT)
 429                         init_rwsem(&ni->file.run_lock);
 430         } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
 431                    S_ISSOCK(mode)) {
 432                 inode->i_op = &ntfs_special_inode_operations;
 433                 init_special_inode(inode, mode, inode->i_rdev);
 434         } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
 435                    fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
 436                 /* Records in $Extend are not a files or general directories */
 437         } else {
 438                 err = -EINVAL;
 439                 goto out;
 440         }
 441
 442         if ((sbi->options.sys_immutable &&
 443              (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
 444             !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
 445                 inode->i_flags |= S_IMMUTABLE;
 446         } else {
 447                 inode->i_flags &= ~S_IMMUTABLE;
 448         }
 449
 450         inode->i_mode = mode;
 451         if (!(ni->ni_flags & NI_FLAG_EA)) {
 452                 /* if no xattr then no security (stored in xattr) */
 453                 inode->i_flags |= S_NOSEC;
 454         }
 455
 456 Ok:
 457         if (ino == MFT_REC_MFT && !sb->s_root)
 458                 sbi->mft.ni = NULL;
 459
 460         unlock_new_inode(inode);
 461
 462         return inode;
 463
 464 out:
 465         if (ino == MFT_REC_MFT && !sb->s_root)
 466                 sbi->mft.ni = NULL;
 467
 468         iget_failed(inode);
 469         return ERR_PTR(err);
 470 }
 471
 472 /* returns 1 if match */
 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         loff_t valid;
 761         ssize_t ret;
 762
 763         if (is_resident(ni)) {
 764                 /*switch to buffered write*/
 765                 ret = 0;
 766                 goto out;
 767         }
 768
 769         ret = blockdev_direct_IO(iocb, inode, iter,
 770                                  wr ? ntfs_get_block_direct_IO_W
 771                                     : ntfs_get_block_direct_IO_R);
 772
 773         if (ret <= 0)
 774                 goto out;
 775
 776         end = vbo + ret;
 777         valid = ni->i_valid;
 778         if (wr) {
 779                 if (end > valid && !S_ISBLK(inode->i_mode)) {
 780                         ni->i_valid = end;
 781                         mark_inode_dirty(inode);
 782                 }
 783         } else if (vbo < valid && valid < end) {
 784                 /* fix page */
 785                 iov_iter_revert(iter, end - valid);
 786                 iov_iter_zero(end - valid, iter);
 787         }
 788
 789 out:
 790         return ret;
 791 }
 792
 793 int ntfs_set_size(struct inode *inode, u64 new_size)
 794 {
 795         struct super_block *sb = inode->i_sb;
 796         struct ntfs_sb_info *sbi = sb->s_fs_info;
 797         struct ntfs_inode *ni = ntfs_i(inode);
 798         int err;
 799
 800         /* Check for maximum file size */
 801         if (is_sparsed(ni) || is_compressed(ni)) {
 802                 if (new_size > sbi->maxbytes_sparse) {
 803                         err = -EFBIG;
 804                         goto out;
 805                 }
 806         } else if (new_size > sbi->maxbytes) {
 807                 err = -EFBIG;
 808                 goto out;
 809         }
 810
 811         ni_lock(ni);
 812         down_write(&ni->file.run_lock);
 813
 814         err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 815                             &ni->i_valid, true, NULL);
 816
 817         up_write(&ni->file.run_lock);
 818         ni_unlock(ni);
 819
 820         mark_inode_dirty(inode);
 821
 822 out:
 823         return err;
 824 }
 825
 826 static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
 827 {
 828         struct address_space *mapping = page->mapping;
 829         struct inode *inode = mapping->host;
 830         struct ntfs_inode *ni = ntfs_i(inode);
 831         int err;
 832
 833         if (is_resident(ni)) {
 834                 ni_lock(ni);
 835                 err = attr_data_write_resident(ni, page);
 836                 ni_unlock(ni);
 837                 if (err != E_NTFS_NONRESIDENT) {
 838                         unlock_page(page);
 839                         return err;
 840                 }
 841         }
 842
 843         return block_write_full_page(page, ntfs_get_block, wbc);
 844 }
 845
 846 static int ntfs_writepages(struct address_space *mapping,
 847                            struct writeback_control *wbc)
 848 {
 849         struct inode *inode = mapping->host;
 850         struct ntfs_inode *ni = ntfs_i(inode);
 851         /* redirect call to 'ntfs_writepage' for resident files*/
 852         get_block_t *get_block = is_resident(ni) ? NULL : &ntfs_get_block;
 853
 854         return mpage_writepages(mapping, wbc, get_block);
 855 }
 856
 857 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
 858                                       struct buffer_head *bh_result, int create)
 859 {
 860         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 861                                   bh_result, create, GET_BLOCK_WRITE_BEGIN);
 862 }
 863
 864 static int ntfs_write_begin(struct file *file, struct address_space *mapping,
 865                             loff_t pos, u32 len, u32 flags, struct page **pagep,
 866                             void **fsdata)
 867 {
 868         int err;
 869         struct inode *inode = mapping->host;
 870         struct ntfs_inode *ni = ntfs_i(inode);
 871
 872         *pagep = NULL;
 873         if (is_resident(ni)) {
 874                 struct page *page = grab_cache_page_write_begin(
 875                         mapping, pos >> PAGE_SHIFT, flags);
 876
 877                 if (!page) {
 878                         err = -ENOMEM;
 879                         goto out;
 880                 }
 881
 882                 ni_lock(ni);
 883                 err = attr_data_read_resident(ni, page);
 884                 ni_unlock(ni);
 885
 886                 if (!err) {
 887                         *pagep = page;
 888                         goto out;
 889                 }
 890                 unlock_page(page);
 891                 put_page(page);
 892
 893                 if (err != E_NTFS_NONRESIDENT)
 894                         goto out;
 895         }
 896
 897         err = block_write_begin(mapping, pos, len, flags, pagep,
 898                                 ntfs_get_block_write_begin);
 899
 900 out:
 901         return err;
 902 }
 903
 904 /* address_space_operations::write_end */
 905 static int ntfs_write_end(struct file *file, struct address_space *mapping,
 906                           loff_t pos, u32 len, u32 copied, struct page *page,
 907                           void *fsdata)
 908
 909 {
 910         struct inode *inode = mapping->host;
 911         struct ntfs_inode *ni = ntfs_i(inode);
 912         u64 valid = ni->i_valid;
 913         bool dirty = false;
 914         int err;
 915
 916         if (is_resident(ni)) {
 917                 ni_lock(ni);
 918                 err = attr_data_write_resident(ni, page);
 919                 ni_unlock(ni);
 920                 if (!err) {
 921                         dirty = true;
 922                         /* clear any buffers in page*/
 923                         if (page_has_buffers(page)) {
 924                                 struct buffer_head *head, *bh;
 925
 926                                 bh = head = page_buffers(page);
 927                                 do {
 928                                         clear_buffer_dirty(bh);
 929                                         clear_buffer_mapped(bh);
 930                                         set_buffer_uptodate(bh);
 931                                 } while (head != (bh = bh->b_this_page));
 932                         }
 933                         SetPageUptodate(page);
 934                         err = copied;
 935                 }
 936                 unlock_page(page);
 937                 put_page(page);
 938         } else {
 939                 err = generic_write_end(file, mapping, pos, len, copied, page,
 940                                         fsdata);
 941         }
 942
 943         if (err >= 0) {
 944                 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
 945                         inode->i_ctime = inode->i_mtime = current_time(inode);
 946                         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 947                         dirty = true;
 948                 }
 949
 950                 if (valid != ni->i_valid) {
 951                         /* ni->i_valid is changed in ntfs_get_block_vbo */
 952                         dirty = true;
 953                 }
 954
 955                 if (dirty)
 956                         mark_inode_dirty(inode);
 957         }
 958
 959         return err;
 960 }
 961
 962 int reset_log_file(struct inode *inode)
 963 {
 964         int err;
 965         loff_t pos = 0;
 966         u32 log_size = inode->i_size;
 967         struct address_space *mapping = inode->i_mapping;
 968
 969         for (;;) {
 970                 u32 len;
 971                 void *kaddr;
 972                 struct page *page;
 973
 974                 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
 975
 976                 err = block_write_begin(mapping, pos, len, 0, &page,
 977                                         ntfs_get_block_write_begin);
 978                 if (err)
 979                         goto out;
 980
 981                 kaddr = kmap_atomic(page);
 982                 memset(kaddr, -1, len);
 983                 kunmap_atomic(kaddr);
 984                 flush_dcache_page(page);
 985
 986                 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
 987                 if (err < 0)
 988                         goto out;
 989                 pos += len;
 990
 991                 if (pos >= log_size)
 992                         break;
 993                 balance_dirty_pages_ratelimited(mapping);
 994         }
 995 out:
 996         mark_inode_dirty_sync(inode);
 997
 998         return err;
 999 }
1000
1001 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1002 {
1003         return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1004 }
1005
1006 int ntfs_sync_inode(struct inode *inode)
1007 {
1008         return _ni_write_inode(inode, 1);
1009 }
1010
1011 /*
1012  * helper function for ntfs_flush_inodes.  This writes both the inode
1013  * and the file data blocks, waiting for in flight data blocks before
1014  * the start of the call.  It does not wait for any io started
1015  * during the call
1016  */
1017 static int writeback_inode(struct inode *inode)
1018 {
1019         int ret = sync_inode_metadata(inode, 0);
1020
1021         if (!ret)
1022                 ret = filemap_fdatawrite(inode->i_mapping);
1023         return ret;
1024 }
1025
1026 /*
1027  * write data and metadata corresponding to i1 and i2.  The io is
1028  * started but we do not wait for any of it to finish.
1029  *
1030  * filemap_flush is used for the block device, so if there is a dirty
1031  * page for a block already in flight, we will not wait and start the
1032  * io over again
1033  */
1034 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1035                       struct inode *i2)
1036 {
1037         int ret = 0;
1038
1039         if (i1)
1040                 ret = writeback_inode(i1);
1041         if (!ret && i2)
1042                 ret = writeback_inode(i2);
1043         if (!ret)
1044                 ret = filemap_flush(sb->s_bdev->bd_inode->i_mapping);
1045         return ret;
1046 }
1047
1048 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1049 {
1050         pgoff_t idx;
1051
1052         /* Write non resident data */
1053         for (idx = 0; bytes; idx++) {
1054                 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1055                 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1056
1057                 if (IS_ERR(page))
1058                         return PTR_ERR(page);
1059
1060                 lock_page(page);
1061                 WARN_ON(!PageUptodate(page));
1062                 ClearPageUptodate(page);
1063
1064                 memcpy(page_address(page), data, op);
1065
1066                 flush_dcache_page(page);
1067                 SetPageUptodate(page);
1068                 unlock_page(page);
1069
1070                 ntfs_unmap_page(page);
1071
1072                 bytes -= op;
1073                 data = Add2Ptr(data, PAGE_SIZE);
1074         }
1075         return 0;
1076 }
1077
1078 /*
1079  * number of bytes to for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1080  * for unicode string of 'uni_len' length
1081  */
1082 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1083 {
1084         /* header + unicode string + decorated unicode string */
1085         return sizeof(short) * (2 * uni_len + 4) +
1086                offsetof(struct REPARSE_DATA_BUFFER,
1087                         SymbolicLinkReparseBuffer.PathBuffer);
1088 }
1089
1090 static struct REPARSE_DATA_BUFFER *
1091 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1092                            u32 size, u16 *nsize)
1093 {
1094         int i, err;
1095         struct REPARSE_DATA_BUFFER *rp;
1096         __le16 *rp_name;
1097         typeof(rp->SymbolicLinkReparseBuffer) *rs;
1098
1099         rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1100         if (!rp)
1101                 return ERR_PTR(-ENOMEM);
1102
1103         rs = &rp->SymbolicLinkReparseBuffer;
1104         rp_name = rs->PathBuffer;
1105
1106         /* Convert link name to utf16 */
1107         err = ntfs_nls_to_utf16(sbi, symname, size,
1108                                 (struct cpu_str *)(rp_name - 1), 2 * size,
1109                                 UTF16_LITTLE_ENDIAN);
1110         if (err < 0)
1111                 goto out;
1112
1113         /* err = the length of unicode name of symlink */
1114         *nsize = ntfs_reparse_bytes(err);
1115
1116         if (*nsize > sbi->reparse.max_size) {
1117                 err = -EFBIG;
1118                 goto out;
1119         }
1120
1121         /* translate linux '/' into windows '\' */
1122         for (i = 0; i < err; i++) {
1123                 if (rp_name[i] == cpu_to_le16('/'))
1124                         rp_name[i] = cpu_to_le16('\\');
1125         }
1126
1127         rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1128         rp->ReparseDataLength =
1129                 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1130                                               SymbolicLinkReparseBuffer));
1131
1132         /* PrintName + SubstituteName */
1133         rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1134         rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1135         rs->PrintNameLength = rs->SubstituteNameOffset;
1136
1137         /*
1138          * TODO: use relative path if possible to allow windows to parse this path
1139          * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE)
1140          */
1141         rs->Flags = 0;
1142
1143         memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1144
1145         /* decorate SubstituteName */
1146         rp_name += err;
1147         rp_name[0] = cpu_to_le16('\\');
1148         rp_name[1] = cpu_to_le16('?');
1149         rp_name[2] = cpu_to_le16('?');
1150         rp_name[3] = cpu_to_le16('\\');
1151
1152         return rp;
1153 out:
1154         kfree(rp);
1155         return ERR_PTR(err);
1156 }
1157
1158 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
1159                                 struct inode *dir, struct dentry *dentry,
1160                                 const struct cpu_str *uni, umode_t mode,
1161                                 dev_t dev, const char *symname, u32 size,
1162                                 struct ntfs_fnd *fnd)
1163 {
1164         int err;
1165         struct super_block *sb = dir->i_sb;
1166         struct ntfs_sb_info *sbi = sb->s_fs_info;
1167         const struct qstr *name = &dentry->d_name;
1168         CLST ino = 0;
1169         struct ntfs_inode *dir_ni = ntfs_i(dir);
1170         struct ntfs_inode *ni = NULL;
1171         struct inode *inode = NULL;
1172         struct ATTRIB *attr;
1173         struct ATTR_STD_INFO5 *std5;
1174         struct ATTR_FILE_NAME *fname;
1175         struct MFT_REC *rec;
1176         u32 asize, dsize, sd_size;
1177         enum FILE_ATTRIBUTE fa;
1178         __le32 security_id = SECURITY_ID_INVALID;
1179         CLST vcn;
1180         const void *sd;
1181         u16 t16, nsize = 0, aid = 0;
1182         struct INDEX_ROOT *root, *dir_root;
1183         struct NTFS_DE *e, *new_de = NULL;
1184         struct REPARSE_DATA_BUFFER *rp = NULL;
1185         bool rp_inserted = false;
1186
1187         dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1188         if (!dir_root)
1189                 return ERR_PTR(-EINVAL);
1190
1191         if (S_ISDIR(mode)) {
1192                 /* use parent's directory attributes */
1193                 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1194                      FILE_ATTRIBUTE_ARCHIVE;
1195                 /*
1196                  * By default child directory inherits parent attributes
1197                  * root directory is hidden + system
1198                  * Make an exception for children in root
1199                  */
1200                 if (dir->i_ino == MFT_REC_ROOT)
1201                         fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1202         } else if (S_ISLNK(mode)) {
1203                 /* It is good idea that link should be the same type (file/dir) as target */
1204                 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1205
1206                 /*
1207                  * linux: there are dir/file/symlink and so on
1208                  * NTFS: symlinks are "dir + reparse" or "file + reparse"
1209                  * It is good idea to create:
1210                  * dir + reparse if 'symname' points to directory
1211                  * or
1212                  * file + reparse if 'symname' points to file
1213                  * Unfortunately kern_path hangs if symname contains 'dir'
1214                  */
1215
1216                 /*
1217                  *      struct path path;
1218                  *
1219                  *      if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1220                  *              struct inode *target = d_inode(path.dentry);
1221                  *
1222                  *              if (S_ISDIR(target->i_mode))
1223                  *                      fa |= FILE_ATTRIBUTE_DIRECTORY;
1224                  *              // if ( target->i_sb == sb ){
1225                  *              //      use relative path?
1226                  *              // }
1227                  *              path_put(&path);
1228                  *      }
1229                  */
1230         } else if (S_ISREG(mode)) {
1231                 if (sbi->options.sparse) {
1232                         /* sparsed regular file, cause option 'sparse' */
1233                         fa = FILE_ATTRIBUTE_SPARSE_FILE |
1234                              FILE_ATTRIBUTE_ARCHIVE;
1235                 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1236                         /* compressed regular file, if parent is compressed */
1237                         fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1238                 } else {
1239                         /* regular file, default attributes */
1240                         fa = FILE_ATTRIBUTE_ARCHIVE;
1241                 }
1242         } else {
1243                 fa = FILE_ATTRIBUTE_ARCHIVE;
1244         }
1245
1246         if (!(mode & 0222))
1247                 fa |= FILE_ATTRIBUTE_READONLY;
1248
1249         /* allocate PATH_MAX bytes */
1250         new_de = __getname();
1251         if (!new_de) {
1252                 err = -ENOMEM;
1253                 goto out1;
1254         }
1255
1256         /*mark rw ntfs as dirty. it will be cleared at umount*/
1257         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1258
1259         /* Step 1: allocate and fill new mft record */
1260         err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1261         if (err)
1262                 goto out2;
1263
1264         ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY);
1265         if (IS_ERR(ni)) {
1266                 err = PTR_ERR(ni);
1267                 ni = NULL;
1268                 goto out3;
1269         }
1270         inode = &ni->vfs_inode;
1271         inode_init_owner(mnt_userns, inode, dir, mode);
1272
1273         inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
1274                 current_time(inode);
1275
1276         rec = ni->mi.mrec;
1277         rec->hard_links = cpu_to_le16(1);
1278         attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1279
1280         /* Get default security id */
1281         sd = s_default_security;
1282         sd_size = sizeof(s_default_security);
1283
1284         if (is_ntfs3(sbi)) {
1285                 security_id = dir_ni->std_security_id;
1286                 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1287                         security_id = sbi->security.def_security_id;
1288
1289                         if (security_id == SECURITY_ID_INVALID &&
1290                             !ntfs_insert_security(sbi, sd, sd_size,
1291                                                   &security_id, NULL))
1292                                 sbi->security.def_security_id = security_id;
1293                 }
1294         }
1295
1296         /* Insert standard info */
1297         std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1298
1299         if (security_id == SECURITY_ID_INVALID) {
1300                 dsize = sizeof(struct ATTR_STD_INFO);
1301         } else {
1302                 dsize = sizeof(struct ATTR_STD_INFO5);
1303                 std5->security_id = security_id;
1304                 ni->std_security_id = security_id;
1305         }
1306         asize = SIZEOF_RESIDENT + dsize;
1307
1308         attr->type = ATTR_STD;
1309         attr->size = cpu_to_le32(asize);
1310         attr->id = cpu_to_le16(aid++);
1311         attr->res.data_off = SIZEOF_RESIDENT_LE;
1312         attr->res.data_size = cpu_to_le32(dsize);
1313
1314         std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1315                 kernel2nt(&inode->i_atime);
1316
1317         ni->std_fa = fa;
1318         std5->fa = fa;
1319
1320         attr = Add2Ptr(attr, asize);
1321
1322         /* Insert file name */
1323         err = fill_name_de(sbi, new_de, name, uni);
1324         if (err)
1325                 goto out4;
1326
1327         mi_get_ref(&ni->mi, &new_de->ref);
1328
1329         fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1330         mi_get_ref(&dir_ni->mi, &fname->home);
1331         fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1332                 fname->dup.a_time = std5->cr_time;
1333         fname->dup.alloc_size = fname->dup.data_size = 0;
1334         fname->dup.fa = std5->fa;
1335         fname->dup.ea_size = fname->dup.reparse = 0;
1336
1337         dsize = le16_to_cpu(new_de->key_size);
1338         asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1339
1340         attr->type = ATTR_NAME;
1341         attr->size = cpu_to_le32(asize);
1342         attr->res.data_off = SIZEOF_RESIDENT_LE;
1343         attr->res.flags = RESIDENT_FLAG_INDEXED;
1344         attr->id = cpu_to_le16(aid++);
1345         attr->res.data_size = cpu_to_le32(dsize);
1346         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1347
1348         attr = Add2Ptr(attr, asize);
1349
1350         if (security_id == SECURITY_ID_INVALID) {
1351                 /* Insert security attribute */
1352                 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1353
1354                 attr->type = ATTR_SECURE;
1355                 attr->size = cpu_to_le32(asize);
1356                 attr->id = cpu_to_le16(aid++);
1357                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1358                 attr->res.data_size = cpu_to_le32(sd_size);
1359                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1360
1361                 attr = Add2Ptr(attr, asize);
1362         }
1363
1364         if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1365                 /*
1366                  * regular directory or symlink to directory
1367                  * Create root attribute
1368                  */
1369                 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1370                 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1371
1372                 attr->type = ATTR_ROOT;
1373                 attr->size = cpu_to_le32(asize);
1374                 attr->id = cpu_to_le16(aid++);
1375
1376                 attr->name_len = ARRAY_SIZE(I30_NAME);
1377                 attr->name_off = SIZEOF_RESIDENT_LE;
1378                 attr->res.data_off =
1379                         cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1380                 attr->res.data_size = cpu_to_le32(dsize);
1381                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1382                        sizeof(I30_NAME));
1383
1384                 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1385                 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1386                 root->ihdr.de_off =
1387                         cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10
1388                 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1389                                               sizeof(struct NTFS_DE));
1390                 root->ihdr.total = root->ihdr.used;
1391
1392                 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1393                 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1394                 e->flags = NTFS_IE_LAST;
1395         } else if (S_ISLNK(mode)) {
1396                 /*
1397                  * symlink to file
1398                  * Create empty resident data attribute
1399                  */
1400                 asize = SIZEOF_RESIDENT;
1401
1402                 /* insert empty ATTR_DATA */
1403                 attr->type = ATTR_DATA;
1404                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1405                 attr->id = cpu_to_le16(aid++);
1406                 attr->name_off = SIZEOF_RESIDENT_LE;
1407                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1408         } else {
1409                 /*
1410                  * regular file or node
1411                  */
1412                 attr->type = ATTR_DATA;
1413                 attr->id = cpu_to_le16(aid++);
1414
1415                 if (S_ISREG(mode)) {
1416                         /* Create empty non resident data attribute */
1417                         attr->non_res = 1;
1418                         attr->nres.evcn = cpu_to_le64(-1ll);
1419                         if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1420                                 attr->size =
1421                                         cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1422                                 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1423                                 attr->flags = ATTR_FLAG_SPARSED;
1424                                 asize = SIZEOF_NONRESIDENT_EX + 8;
1425                         } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1426                                 attr->size =
1427                                         cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1428                                 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1429                                 attr->flags = ATTR_FLAG_COMPRESSED;
1430                                 attr->nres.c_unit = COMPRESSION_UNIT;
1431                                 asize = SIZEOF_NONRESIDENT_EX + 8;
1432                         } else {
1433                                 attr->size =
1434                                         cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1435                                 attr->name_off = SIZEOF_NONRESIDENT_LE;
1436                                 asize = SIZEOF_NONRESIDENT + 8;
1437                         }
1438                         attr->nres.run_off = attr->name_off;
1439                 } else {
1440                         /* Create empty resident data attribute */
1441                         attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1442                         attr->name_off = SIZEOF_RESIDENT_LE;
1443                         if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1444                                 attr->flags = ATTR_FLAG_SPARSED;
1445                         else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1446                                 attr->flags = ATTR_FLAG_COMPRESSED;
1447                         attr->res.data_off = SIZEOF_RESIDENT_LE;
1448                         asize = SIZEOF_RESIDENT;
1449                         ni->ni_flags |= NI_FLAG_RESIDENT;
1450                 }
1451         }
1452
1453         if (S_ISDIR(mode)) {
1454                 ni->ni_flags |= NI_FLAG_DIR;
1455                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1456                 if (err)
1457                         goto out4;
1458         } else if (S_ISLNK(mode)) {
1459                 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1460
1461                 if (IS_ERR(rp)) {
1462                         err = PTR_ERR(rp);
1463                         rp = NULL;
1464                         goto out4;
1465                 }
1466
1467                 /*
1468                  * Insert ATTR_REPARSE
1469                  */
1470                 attr = Add2Ptr(attr, asize);
1471                 attr->type = ATTR_REPARSE;
1472                 attr->id = cpu_to_le16(aid++);
1473
1474                 /* resident or non resident? */
1475                 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1476                 t16 = PtrOffset(rec, attr);
1477
1478                 if (asize + t16 + 8 > sbi->record_size) {
1479                         CLST alen;
1480                         CLST clst = bytes_to_cluster(sbi, nsize);
1481
1482                         /* bytes per runs */
1483                         t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1484
1485                         attr->non_res = 1;
1486                         attr->nres.evcn = cpu_to_le64(clst - 1);
1487                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1488                         attr->nres.run_off = attr->name_off;
1489                         attr->nres.data_size = cpu_to_le64(nsize);
1490                         attr->nres.valid_size = attr->nres.data_size;
1491                         attr->nres.alloc_size =
1492                                 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1493
1494                         err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1495                                                      clst, NULL, 0, &alen, 0,
1496                                                      NULL);
1497                         if (err)
1498                                 goto out5;
1499
1500                         err = run_pack(&ni->file.run, 0, clst,
1501                                        Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1502                                        &vcn);
1503                         if (err < 0)
1504                                 goto out5;
1505
1506                         if (vcn != clst) {
1507                                 err = -EINVAL;
1508                                 goto out5;
1509                         }
1510
1511                         asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1512                         inode->i_size = nsize;
1513                 } else {
1514                         attr->res.data_off = SIZEOF_RESIDENT_LE;
1515                         attr->res.data_size = cpu_to_le32(nsize);
1516                         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1517                         inode->i_size = nsize;
1518                         nsize = 0;
1519                 }
1520
1521                 attr->size = cpu_to_le32(asize);
1522
1523                 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1524                                           &new_de->ref);
1525                 if (err)
1526                         goto out5;
1527
1528                 rp_inserted = true;
1529         }
1530
1531         attr = Add2Ptr(attr, asize);
1532         attr->type = ATTR_END;
1533
1534         rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1535         rec->next_attr_id = cpu_to_le16(aid);
1536
1537         /* Step 2: Add new name in index */
1538         err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd);
1539         if (err)
1540                 goto out6;
1541
1542         /* Update current directory record */
1543         mark_inode_dirty(dir);
1544
1545         inode->i_generation = le16_to_cpu(rec->seq);
1546
1547         dir->i_mtime = dir->i_ctime = inode->i_atime;
1548
1549         if (S_ISDIR(mode)) {
1550                 if (dir->i_mode & S_ISGID)
1551                         mode |= S_ISGID;
1552                 inode->i_op = &ntfs_dir_inode_operations;
1553                 inode->i_fop = &ntfs_dir_operations;
1554         } else if (S_ISLNK(mode)) {
1555                 inode->i_op = &ntfs_link_inode_operations;
1556                 inode->i_fop = NULL;
1557                 inode->i_mapping->a_ops = &ntfs_aops;
1558         } else if (S_ISREG(mode)) {
1559                 inode->i_op = &ntfs_file_inode_operations;
1560                 inode->i_fop = &ntfs_file_operations;
1561                 inode->i_mapping->a_ops =
1562                         is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
1563                 init_rwsem(&ni->file.run_lock);
1564         } else {
1565                 inode->i_op = &ntfs_special_inode_operations;
1566                 init_special_inode(inode, mode, dev);
1567         }
1568
1569 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1570         if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1571                 err = ntfs_init_acl(mnt_userns, inode, dir);
1572                 if (err)
1573                         goto out6;
1574         } else
1575 #endif
1576         {
1577                 inode->i_flags |= S_NOSEC;
1578         }
1579
1580         /* Write non resident data */
1581         if (nsize) {
1582                 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize);
1583                 if (err)
1584                         goto out7;
1585         }
1586
1587         /* call 'd_instantiate' after inode->i_op is set but before finish_open */
1588         d_instantiate(dentry, inode);
1589
1590         ntfs_save_wsl_perm(inode);
1591         mark_inode_dirty(inode);
1592         mark_inode_dirty(dir);
1593
1594         /* normal exit */
1595         goto out2;
1596
1597 out7:
1598
1599         /* undo 'indx_insert_entry' */
1600         indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
1601                           le16_to_cpu(new_de->key_size), sbi);
1602 out6:
1603         if (rp_inserted)
1604                 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1605
1606 out5:
1607         if (S_ISDIR(mode) || run_is_empty(&ni->file.run))
1608                 goto out4;
1609
1610         run_deallocate(sbi, &ni->file.run, false);
1611
1612 out4:
1613         clear_rec_inuse(rec);
1614         clear_nlink(inode);
1615         ni->mi.dirty = false;
1616         discard_new_inode(inode);
1617 out3:
1618         ntfs_mark_rec_free(sbi, ino);
1619
1620 out2:
1621         __putname(new_de);
1622         kfree(rp);
1623
1624 out1:
1625         if (err)
1626                 return ERR_PTR(err);
1627
1628         unlock_new_inode(inode);
1629
1630         return inode;
1631 }
1632
1633 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1634 {
1635         int err;
1636         struct inode *dir = d_inode(dentry->d_parent);
1637         struct ntfs_inode *dir_ni = ntfs_i(dir);
1638         struct ntfs_inode *ni = ntfs_i(inode);
1639         struct super_block *sb = inode->i_sb;
1640         struct ntfs_sb_info *sbi = sb->s_fs_info;
1641         const struct qstr *name = &dentry->d_name;
1642         struct NTFS_DE *new_de = NULL;
1643         struct ATTR_FILE_NAME *fname;
1644         struct ATTRIB *attr;
1645         u16 key_size;
1646         struct INDEX_ROOT *dir_root;
1647
1648         dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1649         if (!dir_root)
1650                 return -EINVAL;
1651
1652         /* allocate PATH_MAX bytes */
1653         new_de = __getname();
1654         if (!new_de)
1655                 return -ENOMEM;
1656
1657         /*mark rw ntfs as dirty. it will be cleared at umount*/
1658         ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
1659
1660         // Insert file name
1661         err = fill_name_de(sbi, new_de, name, NULL);
1662         if (err)
1663                 goto out;
1664
1665         key_size = le16_to_cpu(new_de->key_size);
1666         err = ni_insert_resident(ni, key_size, ATTR_NAME, NULL, 0, &attr, NULL);
1667         if (err)
1668                 goto out;
1669
1670         mi_get_ref(&ni->mi, &new_de->ref);
1671
1672         fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1673         mi_get_ref(&dir_ni->mi, &fname->home);
1674         fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1675                 fname->dup.a_time = kernel2nt(&inode->i_ctime);
1676         fname->dup.alloc_size = fname->dup.data_size = 0;
1677         fname->dup.fa = ni->std_fa;
1678         fname->dup.ea_size = fname->dup.reparse = 0;
1679
1680         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, key_size);
1681
1682         err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, NULL);
1683         if (err)
1684                 goto out;
1685
1686         le16_add_cpu(&ni->mi.mrec->hard_links, 1);
1687         ni->mi.dirty = true;
1688
1689 out:
1690         __putname(new_de);
1691         return err;
1692 }
1693
1694 /*
1695  * ntfs_unlink_inode
1696  *
1697  * inode_operations::unlink
1698  * inode_operations::rmdir
1699  */
1700 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1701 {
1702         int err;
1703         struct super_block *sb = dir->i_sb;
1704         struct ntfs_sb_info *sbi = sb->s_fs_info;
1705         struct inode *inode = d_inode(dentry);
1706         struct ntfs_inode *ni = ntfs_i(inode);
1707         const struct qstr *name = &dentry->d_name;
1708         struct ntfs_inode *dir_ni = ntfs_i(dir);
1709         struct ntfs_index *indx = &dir_ni->dir;
1710         struct cpu_str *uni = NULL;
1711         struct ATTR_FILE_NAME *fname;
1712         u8 name_type;
1713         struct ATTR_LIST_ENTRY *le;
1714         struct MFT_REF ref;
1715         bool is_dir = S_ISDIR(inode->i_mode);
1716         struct INDEX_ROOT *dir_root;
1717
1718         dir_root = indx_get_root(indx, dir_ni, NULL, NULL);
1719         if (!dir_root)
1720                 return -EINVAL;
1721
1722         ni_lock(ni);
1723
1724         if (is_dir && !dir_is_empty(inode)) {
1725                 err = -ENOTEMPTY;
1726                 goto out1;
1727         }
1728
1729         if (ntfs_is_meta_file(sbi, inode->i_ino)) {
1730                 err = -EINVAL;
1731                 goto out1;
1732         }
1733
1734         /* allocate PATH_MAX bytes */
1735         uni = __getname();
1736         if (!uni) {
1737                 err = -ENOMEM;
1738                 goto out1;
1739         }
1740
1741         /* Convert input string to unicode */
1742         err = ntfs_nls_to_utf16(sbi, name->name, name->len, uni, NTFS_NAME_LEN,
1743                                 UTF16_HOST_ENDIAN);
1744         if (err < 0)
1745                 goto out2;
1746
1747         /*mark rw ntfs as dirty. it will be cleared at umount*/
1748         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1749
1750         /* find name in record */
1751         mi_get_ref(&dir_ni->mi, &ref);
1752
1753         le = NULL;
1754         fname = ni_fname_name(ni, uni, &ref, &le);
1755         if (!fname) {
1756                 err = -ENOENT;
1757                 goto out3;
1758         }
1759
1760         name_type = paired_name(fname->type);
1761
1762         err = indx_delete_entry(indx, dir_ni, fname, fname_full_size(fname),
1763                                 sbi);
1764         if (err)
1765                 goto out3;
1766
1767         /* Then remove name from mft */
1768         ni_remove_attr_le(ni, attr_from_name(fname), le);
1769
1770         le16_add_cpu(&ni->mi.mrec->hard_links, -1);
1771         ni->mi.dirty = true;
1772
1773         if (name_type != FILE_NAME_POSIX) {
1774                 /* Now we should delete name by type */
1775                 fname = ni_fname_type(ni, name_type, &le);
1776                 if (fname) {
1777                         err = indx_delete_entry(indx, dir_ni, fname,
1778                                                 fname_full_size(fname), sbi);
1779                         if (err)
1780                                 goto out3;
1781
1782                         ni_remove_attr_le(ni, attr_from_name(fname), le);
1783
1784                         le16_add_cpu(&ni->mi.mrec->hard_links, -1);
1785                 }
1786         }
1787 out3:
1788         switch (err) {
1789         case 0:
1790                 drop_nlink(inode);
1791                 break;
1792         case -ENOTEMPTY:
1793         case -ENOSPC:
1794         case -EROFS:
1795                 break;
1796         default:
1797                 make_bad_inode(inode);
1798         }
1799
1800         dir->i_mtime = dir->i_ctime = current_time(dir);
1801         mark_inode_dirty(dir);
1802         inode->i_ctime = dir->i_ctime;
1803         if (inode->i_nlink)
1804                 mark_inode_dirty(inode);
1805
1806 out2:
1807         __putname(uni);
1808 out1:
1809         ni_unlock(ni);
1810         return err;
1811 }
1812
1813 void ntfs_evict_inode(struct inode *inode)
1814 {
1815         truncate_inode_pages_final(&inode->i_data);
1816
1817         if (inode->i_nlink)
1818                 _ni_write_inode(inode, inode_needs_sync(inode));
1819
1820         invalidate_inode_buffers(inode);
1821         clear_inode(inode);
1822
1823         ni_clear(ntfs_i(inode));
1824 }
1825
1826 static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer,
1827                                       int buflen)
1828 {
1829         int i, err = 0;
1830         struct ntfs_inode *ni = ntfs_i(inode);
1831         struct super_block *sb = inode->i_sb;
1832         struct ntfs_sb_info *sbi = sb->s_fs_info;
1833         u64 i_size = inode->i_size;
1834         u16 nlen = 0;
1835         void *to_free = NULL;
1836         struct REPARSE_DATA_BUFFER *rp;
1837         struct le_str *uni;
1838         struct ATTRIB *attr;
1839
1840         /* Reparse data present. Try to parse it */
1841         static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1842         static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1843
1844         *buffer = 0;
1845
1846         /* Read into temporal buffer */
1847         if (i_size > sbi->reparse.max_size || i_size <= sizeof(u32)) {
1848                 err = -EINVAL;
1849                 goto out;
1850         }
1851
1852         attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1853         if (!attr) {
1854                 err = -EINVAL;
1855                 goto out;
1856         }
1857
1858         if (!attr->non_res) {
1859                 rp = resident_data_ex(attr, i_size);
1860                 if (!rp) {
1861                         err = -EINVAL;
1862                         goto out;
1863                 }
1864         } else {
1865                 rp = kmalloc(i_size, GFP_NOFS);
1866                 if (!rp) {
1867                         err = -ENOMEM;
1868                         goto out;
1869                 }
1870                 to_free = rp;
1871                 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, i_size, NULL);
1872                 if (err)
1873                         goto out;
1874         }
1875
1876         err = -EINVAL;
1877
1878         /* Microsoft Tag */
1879         switch (rp->ReparseTag) {
1880         case IO_REPARSE_TAG_MOUNT_POINT:
1881                 /* Mount points and junctions */
1882                 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1883                 if (i_size <= offsetof(struct REPARSE_DATA_BUFFER,
1884                                        MountPointReparseBuffer.PathBuffer))
1885                         goto out;
1886                 uni = Add2Ptr(rp,
1887                               offsetof(struct REPARSE_DATA_BUFFER,
1888                                        MountPointReparseBuffer.PathBuffer) +
1889                                       le16_to_cpu(rp->MountPointReparseBuffer
1890                                                           .PrintNameOffset) -
1891                                       2);
1892                 nlen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1893                 break;
1894
1895         case IO_REPARSE_TAG_SYMLINK:
1896                 /* FolderSymbolicLink */
1897                 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1898                 if (i_size <= offsetof(struct REPARSE_DATA_BUFFER,
1899                                        SymbolicLinkReparseBuffer.PathBuffer))
1900                         goto out;
1901                 uni = Add2Ptr(rp,
1902                               offsetof(struct REPARSE_DATA_BUFFER,
1903                                        SymbolicLinkReparseBuffer.PathBuffer) +
1904                                       le16_to_cpu(rp->SymbolicLinkReparseBuffer
1905                                                           .PrintNameOffset) -
1906                                       2);
1907                 nlen = le16_to_cpu(
1908                         rp->SymbolicLinkReparseBuffer.PrintNameLength);
1909                 break;
1910
1911         case IO_REPARSE_TAG_CLOUD:
1912         case IO_REPARSE_TAG_CLOUD_1:
1913         case IO_REPARSE_TAG_CLOUD_2:
1914         case IO_REPARSE_TAG_CLOUD_3:
1915         case IO_REPARSE_TAG_CLOUD_4:
1916         case IO_REPARSE_TAG_CLOUD_5:
1917         case IO_REPARSE_TAG_CLOUD_6:
1918         case IO_REPARSE_TAG_CLOUD_7:
1919         case IO_REPARSE_TAG_CLOUD_8:
1920         case IO_REPARSE_TAG_CLOUD_9:
1921         case IO_REPARSE_TAG_CLOUD_A:
1922         case IO_REPARSE_TAG_CLOUD_B:
1923         case IO_REPARSE_TAG_CLOUD_C:
1924         case IO_REPARSE_TAG_CLOUD_D:
1925         case IO_REPARSE_TAG_CLOUD_E:
1926         case IO_REPARSE_TAG_CLOUD_F:
1927                 err = sizeof("OneDrive") - 1;
1928                 if (err > buflen)
1929                         err = buflen;
1930                 memcpy(buffer, "OneDrive", err);
1931                 goto out;
1932
1933         default:
1934                 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
1935                         /* unknown Microsoft Tag */
1936                         goto out;
1937                 }
1938                 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
1939                     i_size <= sizeof(struct REPARSE_POINT)) {
1940                         goto out;
1941                 }
1942
1943                 /* Users tag */
1944                 uni = Add2Ptr(rp, sizeof(struct REPARSE_POINT) - 2);
1945                 nlen = le16_to_cpu(rp->ReparseDataLength) -
1946                        sizeof(struct REPARSE_POINT);
1947         }
1948
1949         /* Convert nlen from bytes to UNICODE chars */
1950         nlen >>= 1;
1951
1952         /* Check that name is available */
1953         if (!nlen || &uni->name[nlen] > (__le16 *)Add2Ptr(rp, i_size))
1954                 goto out;
1955
1956         /* If name is already zero terminated then truncate it now */
1957         if (!uni->name[nlen - 1])
1958                 nlen -= 1;
1959         uni->len = nlen;
1960
1961         err = ntfs_utf16_to_nls(sbi, uni, buffer, buflen);
1962
1963         if (err < 0)
1964                 goto out;
1965
1966         /* translate windows '\' into linux '/' */
1967         for (i = 0; i < err; i++) {
1968                 if (buffer[i] == '\\')
1969                         buffer[i] = '/';
1970         }
1971
1972         /* Always set last zero */
1973         buffer[err] = 0;
1974 out:
1975         kfree(to_free);
1976         return err;
1977 }
1978
1979 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
1980                                  struct delayed_call *done)
1981 {
1982         int err;
1983         char *ret;
1984
1985         if (!de)
1986                 return ERR_PTR(-ECHILD);
1987
1988         ret = kmalloc(PAGE_SIZE, GFP_NOFS);
1989         if (!ret)
1990                 return ERR_PTR(-ENOMEM);
1991
1992         err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE);
1993         if (err < 0) {
1994                 kfree(ret);
1995                 return ERR_PTR(err);
1996         }
1997
1998         set_delayed_call(done, kfree_link, ret);
1999
2000         return ret;
2001 }
2002
2003 // clang-format off
2004 const struct inode_operations ntfs_link_inode_operations = {
2005         .get_link       = ntfs_get_link,
2006         .setattr        = ntfs3_setattr,
2007         .listxattr      = ntfs_listxattr,
2008         .permission     = ntfs_permission,
2009         .get_acl        = ntfs_get_acl,
2010         .set_acl        = ntfs_set_acl,
2011 };
2012
2013 const struct address_space_operations ntfs_aops = {
2014         .readpage       = ntfs_readpage,
2015         .readahead      = ntfs_readahead,
2016         .writepage      = ntfs_writepage,
2017         .writepages     = ntfs_writepages,
2018         .write_begin    = ntfs_write_begin,
2019         .write_end      = ntfs_write_end,
2020         .direct_IO      = ntfs_direct_IO,
2021         .bmap           = ntfs_bmap,
2022         .set_page_dirty = __set_page_dirty_buffers,
2023 };
2024
2025 const struct address_space_operations ntfs_aops_cmpr = {
2026         .readpage       = ntfs_readpage,
2027         .readahead      = ntfs_readahead,
2028 };
2029 // clang-format on