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         if (le16_to_cpu(attr->name_off) + attr->name_len > asize)
 133                 goto out;
 134
 135         if (attr->non_res) {
 136                 t64 = le64_to_cpu(attr->nres.alloc_size);
 137                 if (le64_to_cpu(attr->nres.data_size) > t64 ||
 138                     le64_to_cpu(attr->nres.valid_size) > t64)
 139                         goto out;
 140         }
 141
 142         switch (attr->type) {
 143         case ATTR_STD:
 144                 if (attr->non_res ||
 145                     asize < sizeof(struct ATTR_STD_INFO) + roff ||
 146                     rsize < sizeof(struct ATTR_STD_INFO))
 147                         goto out;
 148
 149                 if (std5)
 150                         goto next_attr;
 151
 152                 std5 = Add2Ptr(attr, roff);
 153
 154 #ifdef STATX_BTIME
 155                 nt2kernel(std5->cr_time, &ni->i_crtime);
 156 #endif
 157                 nt2kernel(std5->a_time, &inode->i_atime);
 158                 nt2kernel(std5->c_time, &inode->i_ctime);
 159                 nt2kernel(std5->m_time, &inode->i_mtime);
 160
 161                 ni->std_fa = std5->fa;
 162
 163                 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
 164                     rsize >= sizeof(struct ATTR_STD_INFO5))
 165                         ni->std_security_id = std5->security_id;
 166                 goto next_attr;
 167
 168         case ATTR_LIST:
 169                 if (attr->name_len || le || ino == MFT_REC_LOG)
 170                         goto out;
 171
 172                 err = ntfs_load_attr_list(ni, attr);
 173                 if (err)
 174                         goto out;
 175
 176                 le = NULL;
 177                 attr = NULL;
 178                 goto next_attr;
 179
 180         case ATTR_NAME:
 181                 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
 182                     rsize < SIZEOF_ATTRIBUTE_FILENAME)
 183                         goto out;
 184
 185                 fname = Add2Ptr(attr, roff);
 186                 if (fname->type == FILE_NAME_DOS)
 187                         goto next_attr;
 188
 189                 names += 1;
 190                 if (name && name->len == fname->name_len &&
 191                     !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
 192                                         NULL, false))
 193                         is_match = true;
 194
 195                 goto next_attr;
 196
 197         case ATTR_DATA:
 198                 if (is_dir) {
 199                         /* Ignore data attribute in dir record. */
 200                         goto next_attr;
 201                 }
 202
 203                 if (ino == MFT_REC_BADCLUST && !attr->non_res)
 204                         goto next_attr;
 205
 206                 if (attr->name_len &&
 207                     ((ino != MFT_REC_BADCLUST || !attr->non_res ||
 208                       attr->name_len != ARRAY_SIZE(BAD_NAME) ||
 209                       memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
 210                      (ino != MFT_REC_SECURE || !attr->non_res ||
 211                       attr->name_len != ARRAY_SIZE(SDS_NAME) ||
 212                       memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
 213                         /* File contains stream attribute. Ignore it. */
 214                         goto next_attr;
 215                 }
 216
 217                 if (is_attr_sparsed(attr))
 218                         ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
 219                 else
 220                         ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
 221
 222                 if (is_attr_compressed(attr))
 223                         ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
 224                 else
 225                         ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
 226
 227                 if (is_attr_encrypted(attr))
 228                         ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
 229                 else
 230                         ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
 231
 232                 if (!attr->non_res) {
 233                         ni->i_valid = inode->i_size = rsize;
 234                         inode_set_bytes(inode, rsize);
 235                 }
 236
 237                 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
 238
 239                 if (!attr->non_res) {
 240                         ni->ni_flags |= NI_FLAG_RESIDENT;
 241                         goto next_attr;
 242                 }
 243
 244                 inode_set_bytes(inode, attr_ondisk_size(attr));
 245
 246                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 247                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 248                 if (!attr->nres.alloc_size)
 249                         goto next_attr;
 250
 251                 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run
 252                                             : &ni->file.run;
 253                 break;
 254
 255         case ATTR_ROOT:
 256                 if (attr->non_res)
 257                         goto out;
 258
 259                 root = Add2Ptr(attr, roff);
 260                 is_root = true;
 261
 262                 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
 263                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 264                         goto next_attr;
 265
 266                 if (root->type != ATTR_NAME ||
 267                     root->rule != NTFS_COLLATION_TYPE_FILENAME)
 268                         goto out;
 269
 270                 if (!is_dir)
 271                         goto next_attr;
 272
 273                 ni->ni_flags |= NI_FLAG_DIR;
 274
 275                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
 276                 if (err)
 277                         goto out;
 278
 279                 mode = sb->s_root
 280                                ? (S_IFDIR | (0777 & sbi->options->fs_dmask_inv))
 281                                : (S_IFDIR | 0777);
 282                 goto next_attr;
 283
 284         case ATTR_ALLOC:
 285                 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
 286                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 287                         goto next_attr;
 288
 289                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 290                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 291                 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
 292
 293                 run = &ni->dir.alloc_run;
 294                 break;
 295
 296         case ATTR_BITMAP:
 297                 if (ino == MFT_REC_MFT) {
 298                         if (!attr->non_res)
 299                                 goto out;
 300 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
 301                         /* 0x20000000 = 2^32 / 8 */
 302                         if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
 303                                 goto out;
 304 #endif
 305                         run = &sbi->mft.bitmap.run;
 306                         break;
 307                 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
 308                            !memcmp(attr_name(attr), I30_NAME,
 309                                    sizeof(I30_NAME)) &&
 310                            attr->non_res) {
 311                         run = &ni->dir.bitmap_run;
 312                         break;
 313                 }
 314                 goto next_attr;
 315
 316         case ATTR_REPARSE:
 317                 if (attr->name_len)
 318                         goto next_attr;
 319
 320                 rp_fa = ni_parse_reparse(ni, attr, &rp);
 321                 switch (rp_fa) {
 322                 case REPARSE_LINK:
 323                         /*
 324                          * Normal symlink.
 325                          * Assume one unicode symbol == one utf8.
 326                          */
 327                         inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
 328                                                             .PrintNameLength) /
 329                                         sizeof(u16);
 330
 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         if (roff > asize) {
 378                 err = -EINVAL;
 379                 goto out;
 380         }
 381
 382         t64 = le64_to_cpu(attr->nres.svcn);
 383
 384         err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
 385                             t64, Add2Ptr(attr, roff), asize - roff);
 386         if (err < 0)
 387                 goto out;
 388         err = 0;
 389         goto next_attr;
 390
 391 end_enum:
 392
 393         if (!std5)
 394                 goto out;
 395
 396         if (!is_match && name) {
 397                 /* Reuse rec as buffer for ascii name. */
 398                 err = -ENOENT;
 399                 goto out;
 400         }
 401
 402         if (std5->fa & FILE_ATTRIBUTE_READONLY)
 403                 mode &= ~0222;
 404
 405         if (!names) {
 406                 err = -EINVAL;
 407                 goto out;
 408         }
 409
 410         if (names != le16_to_cpu(rec->hard_links)) {
 411                 /* Correct minor error on the fly. Do not mark inode as dirty. */
 412                 rec->hard_links = cpu_to_le16(names);
 413                 ni->mi.dirty = true;
 414         }
 415
 416         set_nlink(inode, names);
 417
 418         if (S_ISDIR(mode)) {
 419                 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
 420
 421                 /*
 422                  * Dot and dot-dot should be included in count but was not
 423                  * included in enumeration.
 424                  * Usually a hard links to directories are disabled.
 425                  */
 426                 inode->i_op = &ntfs_dir_inode_operations;
 427                 inode->i_fop = &ntfs_dir_operations;
 428                 ni->i_valid = 0;
 429         } else if (S_ISLNK(mode)) {
 430                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 431                 inode->i_op = &ntfs_link_inode_operations;
 432                 inode->i_fop = NULL;
 433                 inode_nohighmem(inode);
 434         } else if (S_ISREG(mode)) {
 435                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 436                 inode->i_op = &ntfs_file_inode_operations;
 437                 inode->i_fop = &ntfs_file_operations;
 438                 inode->i_mapping->a_ops =
 439                         is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
 440                 if (ino != MFT_REC_MFT)
 441                         init_rwsem(&ni->file.run_lock);
 442         } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
 443                    S_ISSOCK(mode)) {
 444                 inode->i_op = &ntfs_special_inode_operations;
 445                 init_special_inode(inode, mode, inode->i_rdev);
 446         } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
 447                    fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
 448                 /* Records in $Extend are not a files or general directories. */
 449                 inode->i_op = &ntfs_file_inode_operations;
 450         } else {
 451                 err = -EINVAL;
 452                 goto out;
 453         }
 454
 455         if ((sbi->options->sys_immutable &&
 456              (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
 457             !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
 458                 inode->i_flags |= S_IMMUTABLE;
 459         } else {
 460                 inode->i_flags &= ~S_IMMUTABLE;
 461         }
 462
 463         inode->i_mode = mode;
 464         if (!(ni->ni_flags & NI_FLAG_EA)) {
 465                 /* If no xattr then no security (stored in xattr). */
 466                 inode->i_flags |= S_NOSEC;
 467         }
 468
 469 Ok:
 470         if (ino == MFT_REC_MFT && !sb->s_root)
 471                 sbi->mft.ni = NULL;
 472
 473         unlock_new_inode(inode);
 474
 475         return inode;
 476
 477 out:
 478         if (ino == MFT_REC_MFT && !sb->s_root)
 479                 sbi->mft.ni = NULL;
 480
 481         iget_failed(inode);
 482         return ERR_PTR(err);
 483 }
 484
 485 /*
 486  * ntfs_test_inode
 487  *
 488  * Return: 1 if match.
 489  */
 490 static int ntfs_test_inode(struct inode *inode, void *data)
 491 {
 492         struct MFT_REF *ref = data;
 493
 494         return ino_get(ref) == inode->i_ino;
 495 }
 496
 497 static int ntfs_set_inode(struct inode *inode, void *data)
 498 {
 499         const struct MFT_REF *ref = data;
 500
 501         inode->i_ino = ino_get(ref);
 502         return 0;
 503 }
 504
 505 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
 506                          const struct cpu_str *name)
 507 {
 508         struct inode *inode;
 509
 510         inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
 511                              (void *)ref);
 512         if (unlikely(!inode))
 513                 return ERR_PTR(-ENOMEM);
 514
 515         /* If this is a freshly allocated inode, need to read it now. */
 516         if (inode->i_state & I_NEW)
 517                 inode = ntfs_read_mft(inode, name, ref);
 518         else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
 519                 /* Inode overlaps? */
 520                 _ntfs_bad_inode(inode);
 521         }
 522
 523         return inode;
 524 }
 525
 526 enum get_block_ctx {
 527         GET_BLOCK_GENERAL = 0,
 528         GET_BLOCK_WRITE_BEGIN = 1,
 529         GET_BLOCK_DIRECT_IO_R = 2,
 530         GET_BLOCK_DIRECT_IO_W = 3,
 531         GET_BLOCK_BMAP = 4,
 532 };
 533
 534 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
 535                                        struct buffer_head *bh, int create,
 536                                        enum get_block_ctx ctx)
 537 {
 538         struct super_block *sb = inode->i_sb;
 539         struct ntfs_sb_info *sbi = sb->s_fs_info;
 540         struct ntfs_inode *ni = ntfs_i(inode);
 541         struct page *page = bh->b_page;
 542         u8 cluster_bits = sbi->cluster_bits;
 543         u32 block_size = sb->s_blocksize;
 544         u64 bytes, lbo, valid;
 545         u32 off;
 546         int err;
 547         CLST vcn, lcn, len;
 548         bool new;
 549
 550         /* Clear previous state. */
 551         clear_buffer_new(bh);
 552         clear_buffer_uptodate(bh);
 553
 554         /* Direct write uses 'create=0'. */
 555         if (!create && vbo >= ni->i_valid) {
 556                 /* Out of valid. */
 557                 return 0;
 558         }
 559
 560         if (vbo >= inode->i_size) {
 561                 /* Out of size. */
 562                 return 0;
 563         }
 564
 565         if (is_resident(ni)) {
 566                 ni_lock(ni);
 567                 err = attr_data_read_resident(ni, page);
 568                 ni_unlock(ni);
 569
 570                 if (!err)
 571                         set_buffer_uptodate(bh);
 572                 bh->b_size = block_size;
 573                 return err;
 574         }
 575
 576         vcn = vbo >> cluster_bits;
 577         off = vbo & sbi->cluster_mask;
 578         new = false;
 579
 580         err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
 581                                   create && sbi->cluster_size > PAGE_SIZE);
 582         if (err)
 583                 goto out;
 584
 585         if (!len)
 586                 return 0;
 587
 588         bytes = ((u64)len << cluster_bits) - off;
 589
 590         if (lcn == SPARSE_LCN) {
 591                 if (!create) {
 592                         if (bh->b_size > bytes)
 593                                 bh->b_size = bytes;
 594                         return 0;
 595                 }
 596                 WARN_ON(1);
 597         }
 598
 599         if (new)
 600                 set_buffer_new(bh);
 601
 602         lbo = ((u64)lcn << cluster_bits) + off;
 603
 604         set_buffer_mapped(bh);
 605         bh->b_bdev = sb->s_bdev;
 606         bh->b_blocknr = lbo >> sb->s_blocksize_bits;
 607
 608         valid = ni->i_valid;
 609
 610         if (ctx == GET_BLOCK_DIRECT_IO_W) {
 611                 /* ntfs_direct_IO will update ni->i_valid. */
 612                 if (vbo >= valid)
 613                         set_buffer_new(bh);
 614         } else if (create) {
 615                 /* Normal write. */
 616                 if (bytes > bh->b_size)
 617                         bytes = bh->b_size;
 618
 619                 if (vbo >= valid)
 620                         set_buffer_new(bh);
 621
 622                 if (vbo + bytes > valid) {
 623                         ni->i_valid = vbo + bytes;
 624                         mark_inode_dirty(inode);
 625                 }
 626         } else if (vbo >= valid) {
 627                 /* Read out of valid data. */
 628                 /* Should never be here 'cause already checked. */
 629                 clear_buffer_mapped(bh);
 630         } else if (vbo + bytes <= valid) {
 631                 /* Normal read. */
 632         } else if (vbo + block_size <= valid) {
 633                 /* Normal short read. */
 634                 bytes = block_size;
 635         } else {
 636                 /*
 637                  * Read across valid size: vbo < valid && valid < vbo + block_size
 638                  */
 639                 bytes = block_size;
 640
 641                 if (page) {
 642                         u32 voff = valid - vbo;
 643
 644                         bh->b_size = block_size;
 645                         off = vbo & (PAGE_SIZE - 1);
 646                         set_bh_page(bh, page, off);
 647
 648                         lock_buffer(bh);
 649                         bh->b_end_io = end_buffer_read_sync;
 650                         get_bh(bh);
 651                         submit_bh(REQ_OP_READ, bh);
 652
 653                         wait_on_buffer(bh);
 654                         if (!buffer_uptodate(bh)) {
 655                                 err = -EIO;
 656                                 goto out;
 657                         }
 658                         zero_user_segment(page, off + voff, off + block_size);
 659                 }
 660         }
 661
 662         if (bh->b_size > bytes)
 663                 bh->b_size = bytes;
 664
 665 #ifndef __LP64__
 666         if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
 667                 static_assert(sizeof(size_t) < sizeof(loff_t));
 668                 if (bytes > 0x40000000u)
 669                         bh->b_size = 0x40000000u;
 670         }
 671 #endif
 672
 673         return 0;
 674
 675 out:
 676         return err;
 677 }
 678
 679 int ntfs_get_block(struct inode *inode, sector_t vbn,
 680                    struct buffer_head *bh_result, int create)
 681 {
 682         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 683                                   bh_result, create, GET_BLOCK_GENERAL);
 684 }
 685
 686 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
 687                                struct buffer_head *bh_result, int create)
 688 {
 689         return ntfs_get_block_vbo(inode,
 690                                   (u64)vsn << inode->i_sb->s_blocksize_bits,
 691                                   bh_result, create, GET_BLOCK_BMAP);
 692 }
 693
 694 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
 695 {
 696         return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
 697 }
 698
 699 static int ntfs_read_folio(struct file *file, struct folio *folio)
 700 {
 701         struct page *page = &folio->page;
 702         int err;
 703         struct address_space *mapping = page->mapping;
 704         struct inode *inode = mapping->host;
 705         struct ntfs_inode *ni = ntfs_i(inode);
 706
 707         if (is_resident(ni)) {
 708                 ni_lock(ni);
 709                 err = attr_data_read_resident(ni, page);
 710                 ni_unlock(ni);
 711                 if (err != E_NTFS_NONRESIDENT) {
 712                         unlock_page(page);
 713                         return err;
 714                 }
 715         }
 716
 717         if (is_compressed(ni)) {
 718                 ni_lock(ni);
 719                 err = ni_readpage_cmpr(ni, page);
 720                 ni_unlock(ni);
 721                 return err;
 722         }
 723
 724         /* Normal + sparse files. */
 725         return mpage_read_folio(folio, ntfs_get_block);
 726 }
 727
 728 static void ntfs_readahead(struct readahead_control *rac)
 729 {
 730         struct address_space *mapping = rac->mapping;
 731         struct inode *inode = mapping->host;
 732         struct ntfs_inode *ni = ntfs_i(inode);
 733         u64 valid;
 734         loff_t pos;
 735
 736         if (is_resident(ni)) {
 737                 /* No readahead for resident. */
 738                 return;
 739         }
 740
 741         if (is_compressed(ni)) {
 742                 /* No readahead for compressed. */
 743                 return;
 744         }
 745
 746         valid = ni->i_valid;
 747         pos = readahead_pos(rac);
 748
 749         if (valid < i_size_read(inode) && pos <= valid &&
 750             valid < pos + readahead_length(rac)) {
 751                 /* Range cross 'valid'. Read it page by page. */
 752                 return;
 753         }
 754
 755         mpage_readahead(rac, ntfs_get_block);
 756 }
 757
 758 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
 759                                       struct buffer_head *bh_result, int create)
 760 {
 761         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 762                                   bh_result, create, GET_BLOCK_DIRECT_IO_R);
 763 }
 764
 765 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
 766                                       struct buffer_head *bh_result, int create)
 767 {
 768         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 769                                   bh_result, create, GET_BLOCK_DIRECT_IO_W);
 770 }
 771
 772 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 773 {
 774         struct file *file = iocb->ki_filp;
 775         struct address_space *mapping = file->f_mapping;
 776         struct inode *inode = mapping->host;
 777         struct ntfs_inode *ni = ntfs_i(inode);
 778         loff_t vbo = iocb->ki_pos;
 779         loff_t end;
 780         int wr = iov_iter_rw(iter) & WRITE;
 781         size_t iter_count = iov_iter_count(iter);
 782         loff_t valid;
 783         ssize_t ret;
 784
 785         if (is_resident(ni)) {
 786                 /* Switch to buffered write. */
 787                 ret = 0;
 788                 goto out;
 789         }
 790
 791         ret = blockdev_direct_IO(iocb, inode, iter,
 792                                  wr ? ntfs_get_block_direct_IO_W
 793                                     : ntfs_get_block_direct_IO_R);
 794
 795         if (ret > 0)
 796                 end = vbo + ret;
 797         else if (wr && ret == -EIOCBQUEUED)
 798                 end = vbo + iter_count;
 799         else
 800                 goto out;
 801
 802         valid = ni->i_valid;
 803         if (wr) {
 804                 if (end > valid && !S_ISBLK(inode->i_mode)) {
 805                         ni->i_valid = end;
 806                         mark_inode_dirty(inode);
 807                 }
 808         } else if (vbo < valid && valid < end) {
 809                 /* Fix page. */
 810                 iov_iter_revert(iter, end - valid);
 811                 iov_iter_zero(end - valid, iter);
 812         }
 813
 814 out:
 815         return ret;
 816 }
 817
 818 int ntfs_set_size(struct inode *inode, u64 new_size)
 819 {
 820         struct super_block *sb = inode->i_sb;
 821         struct ntfs_sb_info *sbi = sb->s_fs_info;
 822         struct ntfs_inode *ni = ntfs_i(inode);
 823         int err;
 824
 825         /* Check for maximum file size. */
 826         if (is_sparsed(ni) || is_compressed(ni)) {
 827                 if (new_size > sbi->maxbytes_sparse) {
 828                         err = -EFBIG;
 829                         goto out;
 830                 }
 831         } else if (new_size > sbi->maxbytes) {
 832                 err = -EFBIG;
 833                 goto out;
 834         }
 835
 836         ni_lock(ni);
 837         down_write(&ni->file.run_lock);
 838
 839         err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 840                             &ni->i_valid, true, NULL);
 841
 842         up_write(&ni->file.run_lock);
 843         ni_unlock(ni);
 844
 845         mark_inode_dirty(inode);
 846
 847 out:
 848         return err;
 849 }
 850
 851 static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
 852 {
 853         struct address_space *mapping = page->mapping;
 854         struct inode *inode = mapping->host;
 855         struct ntfs_inode *ni = ntfs_i(inode);
 856         int err;
 857
 858         if (is_resident(ni)) {
 859                 ni_lock(ni);
 860                 err = attr_data_write_resident(ni, page);
 861                 ni_unlock(ni);
 862                 if (err != E_NTFS_NONRESIDENT) {
 863                         unlock_page(page);
 864                         return err;
 865                 }
 866         }
 867
 868         return block_write_full_page(page, ntfs_get_block, wbc);
 869 }
 870
 871 static int ntfs_writepages(struct address_space *mapping,
 872                            struct writeback_control *wbc)
 873 {
 874         /* Redirect call to 'ntfs_writepage' for resident files. */
 875         if (is_resident(ntfs_i(mapping->host)))
 876                 return generic_writepages(mapping, wbc);
 877         return mpage_writepages(mapping, wbc, ntfs_get_block);
 878 }
 879
 880 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
 881                                       struct buffer_head *bh_result, int create)
 882 {
 883         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 884                                   bh_result, create, GET_BLOCK_WRITE_BEGIN);
 885 }
 886
 887 int ntfs_write_begin(struct file *file, struct address_space *mapping,
 888                      loff_t pos, u32 len, struct page **pagep, void **fsdata)
 889 {
 890         int err;
 891         struct inode *inode = mapping->host;
 892         struct ntfs_inode *ni = ntfs_i(inode);
 893
 894         *pagep = NULL;
 895         if (is_resident(ni)) {
 896                 struct page *page = grab_cache_page_write_begin(
 897                         mapping, pos >> PAGE_SHIFT);
 898
 899                 if (!page) {
 900                         err = -ENOMEM;
 901                         goto out;
 902                 }
 903
 904                 ni_lock(ni);
 905                 err = attr_data_read_resident(ni, page);
 906                 ni_unlock(ni);
 907
 908                 if (!err) {
 909                         *pagep = page;
 910                         goto out;
 911                 }
 912                 unlock_page(page);
 913                 put_page(page);
 914
 915                 if (err != E_NTFS_NONRESIDENT)
 916                         goto out;
 917         }
 918
 919         err = block_write_begin(mapping, pos, len, pagep,
 920                                 ntfs_get_block_write_begin);
 921
 922 out:
 923         return err;
 924 }
 925
 926 /*
 927  * ntfs_write_end - Address_space_operations::write_end.
 928  */
 929 int ntfs_write_end(struct file *file, struct address_space *mapping,
 930                    loff_t pos, u32 len, u32 copied, struct page *page,
 931                    void *fsdata)
 932 {
 933         struct inode *inode = mapping->host;
 934         struct ntfs_inode *ni = ntfs_i(inode);
 935         u64 valid = ni->i_valid;
 936         bool dirty = false;
 937         int err;
 938
 939         if (is_resident(ni)) {
 940                 ni_lock(ni);
 941                 err = attr_data_write_resident(ni, page);
 942                 ni_unlock(ni);
 943                 if (!err) {
 944                         dirty = true;
 945                         /* Clear any buffers in page. */
 946                         if (page_has_buffers(page)) {
 947                                 struct buffer_head *head, *bh;
 948
 949                                 bh = head = page_buffers(page);
 950                                 do {
 951                                         clear_buffer_dirty(bh);
 952                                         clear_buffer_mapped(bh);
 953                                         set_buffer_uptodate(bh);
 954                                 } while (head != (bh = bh->b_this_page));
 955                         }
 956                         SetPageUptodate(page);
 957                         err = copied;
 958                 }
 959                 unlock_page(page);
 960                 put_page(page);
 961         } else {
 962                 err = generic_write_end(file, mapping, pos, len, copied, page,
 963                                         fsdata);
 964         }
 965
 966         if (err >= 0) {
 967                 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
 968                         inode->i_ctime = inode->i_mtime = current_time(inode);
 969                         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 970                         dirty = true;
 971                 }
 972
 973                 if (valid != ni->i_valid) {
 974                         /* ni->i_valid is changed in ntfs_get_block_vbo. */
 975                         dirty = true;
 976                 }
 977
 978                 if (dirty)
 979                         mark_inode_dirty(inode);
 980         }
 981
 982         return err;
 983 }
 984
 985 int reset_log_file(struct inode *inode)
 986 {
 987         int err;
 988         loff_t pos = 0;
 989         u32 log_size = inode->i_size;
 990         struct address_space *mapping = inode->i_mapping;
 991
 992         for (;;) {
 993                 u32 len;
 994                 void *kaddr;
 995                 struct page *page;
 996
 997                 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
 998
 999                 err = block_write_begin(mapping, pos, len, &page,
1000                                         ntfs_get_block_write_begin);
1001                 if (err)
1002                         goto out;
1003
1004                 kaddr = kmap_atomic(page);
1005                 memset(kaddr, -1, len);
1006                 kunmap_atomic(kaddr);
1007                 flush_dcache_page(page);
1008
1009                 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
1010                 if (err < 0)
1011                         goto out;
1012                 pos += len;
1013
1014                 if (pos >= log_size)
1015                         break;
1016                 balance_dirty_pages_ratelimited(mapping);
1017         }
1018 out:
1019         mark_inode_dirty_sync(inode);
1020
1021         return err;
1022 }
1023
1024 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1025 {
1026         return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1027 }
1028
1029 int ntfs_sync_inode(struct inode *inode)
1030 {
1031         return _ni_write_inode(inode, 1);
1032 }
1033
1034 /*
1035  * writeback_inode - Helper function for ntfs_flush_inodes().
1036  *
1037  * This writes both the inode and the file data blocks, waiting
1038  * for in flight data blocks before the start of the call.  It
1039  * does not wait for any io started during the call.
1040  */
1041 static int writeback_inode(struct inode *inode)
1042 {
1043         int ret = sync_inode_metadata(inode, 0);
1044
1045         if (!ret)
1046                 ret = filemap_fdatawrite(inode->i_mapping);
1047         return ret;
1048 }
1049
1050 /*
1051  * ntfs_flush_inodes
1052  *
1053  * Write data and metadata corresponding to i1 and i2.  The io is
1054  * started but we do not wait for any of it to finish.
1055  *
1056  * filemap_flush() is used for the block device, so if there is a dirty
1057  * page for a block already in flight, we will not wait and start the
1058  * io over again.
1059  */
1060 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1061                       struct inode *i2)
1062 {
1063         int ret = 0;
1064
1065         if (i1)
1066                 ret = writeback_inode(i1);
1067         if (!ret && i2)
1068                 ret = writeback_inode(i2);
1069         if (!ret)
1070                 ret = sync_blockdev_nowait(sb->s_bdev);
1071         return ret;
1072 }
1073
1074 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1075 {
1076         pgoff_t idx;
1077
1078         /* Write non resident data. */
1079         for (idx = 0; bytes; idx++) {
1080                 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1081                 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1082
1083                 if (IS_ERR(page))
1084                         return PTR_ERR(page);
1085
1086                 lock_page(page);
1087                 WARN_ON(!PageUptodate(page));
1088                 ClearPageUptodate(page);
1089
1090                 memcpy(page_address(page), data, op);
1091
1092                 flush_dcache_page(page);
1093                 SetPageUptodate(page);
1094                 unlock_page(page);
1095
1096                 ntfs_unmap_page(page);
1097
1098                 bytes -= op;
1099                 data = Add2Ptr(data, PAGE_SIZE);
1100         }
1101         return 0;
1102 }
1103
1104 /*
1105  * ntfs_reparse_bytes
1106  *
1107  * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1108  * for unicode string of @uni_len length.
1109  */
1110 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1111 {
1112         /* Header + unicode string + decorated unicode string. */
1113         return sizeof(short) * (2 * uni_len + 4) +
1114                offsetof(struct REPARSE_DATA_BUFFER,
1115                         SymbolicLinkReparseBuffer.PathBuffer);
1116 }
1117
1118 static struct REPARSE_DATA_BUFFER *
1119 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1120                            u32 size, u16 *nsize)
1121 {
1122         int i, err;
1123         struct REPARSE_DATA_BUFFER *rp;
1124         __le16 *rp_name;
1125         typeof(rp->SymbolicLinkReparseBuffer) *rs;
1126
1127         rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1128         if (!rp)
1129                 return ERR_PTR(-ENOMEM);
1130
1131         rs = &rp->SymbolicLinkReparseBuffer;
1132         rp_name = rs->PathBuffer;
1133
1134         /* Convert link name to UTF-16. */
1135         err = ntfs_nls_to_utf16(sbi, symname, size,
1136                                 (struct cpu_str *)(rp_name - 1), 2 * size,
1137                                 UTF16_LITTLE_ENDIAN);
1138         if (err < 0)
1139                 goto out;
1140
1141         /* err = the length of unicode name of symlink. */
1142         *nsize = ntfs_reparse_bytes(err);
1143
1144         if (*nsize > sbi->reparse.max_size) {
1145                 err = -EFBIG;
1146                 goto out;
1147         }
1148
1149         /* Translate Linux '/' into Windows '\'. */
1150         for (i = 0; i < err; i++) {
1151                 if (rp_name[i] == cpu_to_le16('/'))
1152                         rp_name[i] = cpu_to_le16('\\');
1153         }
1154
1155         rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1156         rp->ReparseDataLength =
1157                 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1158                                               SymbolicLinkReparseBuffer));
1159
1160         /* PrintName + SubstituteName. */
1161         rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1162         rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1163         rs->PrintNameLength = rs->SubstituteNameOffset;
1164
1165         /*
1166          * TODO: Use relative path if possible to allow Windows to
1167          * parse this path.
1168          * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1169          */
1170         rs->Flags = 0;
1171
1172         memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1173
1174         /* Decorate SubstituteName. */
1175         rp_name += err;
1176         rp_name[0] = cpu_to_le16('\\');
1177         rp_name[1] = cpu_to_le16('?');
1178         rp_name[2] = cpu_to_le16('?');
1179         rp_name[3] = cpu_to_le16('\\');
1180
1181         return rp;
1182 out:
1183         kfree(rp);
1184         return ERR_PTR(err);
1185 }
1186
1187 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
1188                                 struct inode *dir, struct dentry *dentry,
1189                                 const struct cpu_str *uni, umode_t mode,
1190                                 dev_t dev, const char *symname, u32 size,
1191                                 struct ntfs_fnd *fnd)
1192 {
1193         int err;
1194         struct super_block *sb = dir->i_sb;
1195         struct ntfs_sb_info *sbi = sb->s_fs_info;
1196         const struct qstr *name = &dentry->d_name;
1197         CLST ino = 0;
1198         struct ntfs_inode *dir_ni = ntfs_i(dir);
1199         struct ntfs_inode *ni = NULL;
1200         struct inode *inode = NULL;
1201         struct ATTRIB *attr;
1202         struct ATTR_STD_INFO5 *std5;
1203         struct ATTR_FILE_NAME *fname;
1204         struct MFT_REC *rec;
1205         u32 asize, dsize, sd_size;
1206         enum FILE_ATTRIBUTE fa;
1207         __le32 security_id = SECURITY_ID_INVALID;
1208         CLST vcn;
1209         const void *sd;
1210         u16 t16, nsize = 0, aid = 0;
1211         struct INDEX_ROOT *root, *dir_root;
1212         struct NTFS_DE *e, *new_de = NULL;
1213         struct REPARSE_DATA_BUFFER *rp = NULL;
1214         bool rp_inserted = false;
1215
1216         ni_lock_dir(dir_ni);
1217
1218         dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1219         if (!dir_root) {
1220                 err = -EINVAL;
1221                 goto out1;
1222         }
1223
1224         if (S_ISDIR(mode)) {
1225                 /* Use parent's directory attributes. */
1226                 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1227                      FILE_ATTRIBUTE_ARCHIVE;
1228                 /*
1229                  * By default child directory inherits parent attributes.
1230                  * Root directory is hidden + system.
1231                  * Make an exception for children in root.
1232                  */
1233                 if (dir->i_ino == MFT_REC_ROOT)
1234                         fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1235         } else if (S_ISLNK(mode)) {
1236                 /* It is good idea that link should be the same type (file/dir) as target */
1237                 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1238
1239                 /*
1240                  * Linux: there are dir/file/symlink and so on.
1241                  * NTFS: symlinks are "dir + reparse" or "file + reparse"
1242                  * It is good idea to create:
1243                  * dir + reparse if 'symname' points to directory
1244                  * or
1245                  * file + reparse if 'symname' points to file
1246                  * Unfortunately kern_path hangs if symname contains 'dir'.
1247                  */
1248
1249                 /*
1250                  *      struct path path;
1251                  *
1252                  *      if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1253                  *              struct inode *target = d_inode(path.dentry);
1254                  *
1255                  *              if (S_ISDIR(target->i_mode))
1256                  *                      fa |= FILE_ATTRIBUTE_DIRECTORY;
1257                  *              // if ( target->i_sb == sb ){
1258                  *              //      use relative path?
1259                  *              // }
1260                  *              path_put(&path);
1261                  *      }
1262                  */
1263         } else if (S_ISREG(mode)) {
1264                 if (sbi->options->sparse) {
1265                         /* Sparsed regular file, cause option 'sparse'. */
1266                         fa = FILE_ATTRIBUTE_SPARSE_FILE |
1267                              FILE_ATTRIBUTE_ARCHIVE;
1268                 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1269                         /* Compressed regular file, if parent is compressed. */
1270                         fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1271                 } else {
1272                         /* Regular file, default attributes. */
1273                         fa = FILE_ATTRIBUTE_ARCHIVE;
1274                 }
1275         } else {
1276                 fa = FILE_ATTRIBUTE_ARCHIVE;
1277         }
1278
1279         /* If option "hide_dot_files" then set hidden attribute for dot files. */
1280         if (sbi->options->hide_dot_files && name->name[0] == '.')
1281                 fa |= FILE_ATTRIBUTE_HIDDEN;
1282
1283         if (!(mode & 0222))
1284                 fa |= FILE_ATTRIBUTE_READONLY;
1285
1286         /* Allocate PATH_MAX bytes. */
1287         new_de = __getname();
1288         if (!new_de) {
1289                 err = -ENOMEM;
1290                 goto out1;
1291         }
1292
1293         /* Mark rw ntfs as dirty. it will be cleared at umount. */
1294         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1295
1296         /* Step 1: allocate and fill new mft record. */
1297         err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1298         if (err)
1299                 goto out2;
1300
1301         ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY);
1302         if (IS_ERR(ni)) {
1303                 err = PTR_ERR(ni);
1304                 ni = NULL;
1305                 goto out3;
1306         }
1307         inode = &ni->vfs_inode;
1308         inode_init_owner(mnt_userns, inode, dir, mode);
1309         mode = inode->i_mode;
1310
1311         inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
1312                 current_time(inode);
1313
1314         rec = ni->mi.mrec;
1315         rec->hard_links = cpu_to_le16(1);
1316         attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1317
1318         /* Get default security id. */
1319         sd = s_default_security;
1320         sd_size = sizeof(s_default_security);
1321
1322         if (is_ntfs3(sbi)) {
1323                 security_id = dir_ni->std_security_id;
1324                 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1325                         security_id = sbi->security.def_security_id;
1326
1327                         if (security_id == SECURITY_ID_INVALID &&
1328                             !ntfs_insert_security(sbi, sd, sd_size,
1329                                                   &security_id, NULL))
1330                                 sbi->security.def_security_id = security_id;
1331                 }
1332         }
1333
1334         /* Insert standard info. */
1335         std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1336
1337         if (security_id == SECURITY_ID_INVALID) {
1338                 dsize = sizeof(struct ATTR_STD_INFO);
1339         } else {
1340                 dsize = sizeof(struct ATTR_STD_INFO5);
1341                 std5->security_id = security_id;
1342                 ni->std_security_id = security_id;
1343         }
1344         asize = SIZEOF_RESIDENT + dsize;
1345
1346         attr->type = ATTR_STD;
1347         attr->size = cpu_to_le32(asize);
1348         attr->id = cpu_to_le16(aid++);
1349         attr->res.data_off = SIZEOF_RESIDENT_LE;
1350         attr->res.data_size = cpu_to_le32(dsize);
1351
1352         std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1353                 kernel2nt(&inode->i_atime);
1354
1355         ni->std_fa = fa;
1356         std5->fa = fa;
1357
1358         attr = Add2Ptr(attr, asize);
1359
1360         /* Insert file name. */
1361         err = fill_name_de(sbi, new_de, name, uni);
1362         if (err)
1363                 goto out4;
1364
1365         mi_get_ref(&ni->mi, &new_de->ref);
1366
1367         fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1368
1369         if (sbi->options->windows_names &&
1370             !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1371                 err = -EINVAL;
1372                 goto out4;
1373         }
1374
1375         mi_get_ref(&dir_ni->mi, &fname->home);
1376         fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1377                 fname->dup.a_time = std5->cr_time;
1378         fname->dup.alloc_size = fname->dup.data_size = 0;
1379         fname->dup.fa = std5->fa;
1380         fname->dup.ea_size = fname->dup.reparse = 0;
1381
1382         dsize = le16_to_cpu(new_de->key_size);
1383         asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1384
1385         attr->type = ATTR_NAME;
1386         attr->size = cpu_to_le32(asize);
1387         attr->res.data_off = SIZEOF_RESIDENT_LE;
1388         attr->res.flags = RESIDENT_FLAG_INDEXED;
1389         attr->id = cpu_to_le16(aid++);
1390         attr->res.data_size = cpu_to_le32(dsize);
1391         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1392
1393         attr = Add2Ptr(attr, asize);
1394
1395         if (security_id == SECURITY_ID_INVALID) {
1396                 /* Insert security attribute. */
1397                 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1398
1399                 attr->type = ATTR_SECURE;
1400                 attr->size = cpu_to_le32(asize);
1401                 attr->id = cpu_to_le16(aid++);
1402                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1403                 attr->res.data_size = cpu_to_le32(sd_size);
1404                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1405
1406                 attr = Add2Ptr(attr, asize);
1407         }
1408
1409         attr->id = cpu_to_le16(aid++);
1410         if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1411                 /*
1412                  * Regular directory or symlink to directory.
1413                  * Create root attribute.
1414                  */
1415                 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1416                 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1417
1418                 attr->type = ATTR_ROOT;
1419                 attr->size = cpu_to_le32(asize);
1420
1421                 attr->name_len = ARRAY_SIZE(I30_NAME);
1422                 attr->name_off = SIZEOF_RESIDENT_LE;
1423                 attr->res.data_off =
1424                         cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1425                 attr->res.data_size = cpu_to_le32(dsize);
1426                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1427                        sizeof(I30_NAME));
1428
1429                 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1430                 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1431                 root->ihdr.de_off =
1432                         cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10
1433                 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1434                                               sizeof(struct NTFS_DE));
1435                 root->ihdr.total = root->ihdr.used;
1436
1437                 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1438                 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1439                 e->flags = NTFS_IE_LAST;
1440         } else if (S_ISLNK(mode)) {
1441                 /*
1442                  * Symlink to file.
1443                  * Create empty resident data attribute.
1444                  */
1445                 asize = SIZEOF_RESIDENT;
1446
1447                 /* Insert empty ATTR_DATA */
1448                 attr->type = ATTR_DATA;
1449                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1450                 attr->name_off = SIZEOF_RESIDENT_LE;
1451                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1452         } else if (S_ISREG(mode)) {
1453                 /*
1454                  * Regular file. Create empty non resident data attribute.
1455                  */
1456                 attr->type = ATTR_DATA;
1457                 attr->non_res = 1;
1458                 attr->nres.evcn = cpu_to_le64(-1ll);
1459                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1460                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1461                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1462                         attr->flags = ATTR_FLAG_SPARSED;
1463                         asize = SIZEOF_NONRESIDENT_EX + 8;
1464                 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1465                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1466                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1467                         attr->flags = ATTR_FLAG_COMPRESSED;
1468                         attr->nres.c_unit = COMPRESSION_UNIT;
1469                         asize = SIZEOF_NONRESIDENT_EX + 8;
1470                 } else {
1471                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1472                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1473                         asize = SIZEOF_NONRESIDENT + 8;
1474                 }
1475                 attr->nres.run_off = attr->name_off;
1476         } else {
1477                 /*
1478                  * Node. Create empty resident data attribute.
1479                  */
1480                 attr->type = ATTR_DATA;
1481                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1482                 attr->name_off = SIZEOF_RESIDENT_LE;
1483                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1484                         attr->flags = ATTR_FLAG_SPARSED;
1485                 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1486                         attr->flags = ATTR_FLAG_COMPRESSED;
1487                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1488                 asize = SIZEOF_RESIDENT;
1489                 ni->ni_flags |= NI_FLAG_RESIDENT;
1490         }
1491
1492         if (S_ISDIR(mode)) {
1493                 ni->ni_flags |= NI_FLAG_DIR;
1494                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1495                 if (err)
1496                         goto out4;
1497         } else if (S_ISLNK(mode)) {
1498                 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1499
1500                 if (IS_ERR(rp)) {
1501                         err = PTR_ERR(rp);
1502                         rp = NULL;
1503                         goto out4;
1504                 }
1505
1506                 /*
1507                  * Insert ATTR_REPARSE.
1508                  */
1509                 attr = Add2Ptr(attr, asize);
1510                 attr->type = ATTR_REPARSE;
1511                 attr->id = cpu_to_le16(aid++);
1512
1513                 /* Resident or non resident? */
1514                 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1515                 t16 = PtrOffset(rec, attr);
1516
1517                 /*
1518                  * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1519                  * It is good idea to keep extened attributes resident.
1520                  */
1521                 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1522                         CLST alen;
1523                         CLST clst = bytes_to_cluster(sbi, nsize);
1524
1525                         /* Bytes per runs. */
1526                         t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1527
1528                         attr->non_res = 1;
1529                         attr->nres.evcn = cpu_to_le64(clst - 1);
1530                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1531                         attr->nres.run_off = attr->name_off;
1532                         attr->nres.data_size = cpu_to_le64(nsize);
1533                         attr->nres.valid_size = attr->nres.data_size;
1534                         attr->nres.alloc_size =
1535                                 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1536
1537                         err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1538                                                      clst, NULL, ALLOCATE_DEF,
1539                                                      &alen, 0, NULL, NULL);
1540                         if (err)
1541                                 goto out5;
1542
1543                         err = run_pack(&ni->file.run, 0, clst,
1544                                        Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1545                                        &vcn);
1546                         if (err < 0)
1547                                 goto out5;
1548
1549                         if (vcn != clst) {
1550                                 err = -EINVAL;
1551                                 goto out5;
1552                         }
1553
1554                         asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1555                 } else {
1556                         attr->res.data_off = SIZEOF_RESIDENT_LE;
1557                         attr->res.data_size = cpu_to_le32(nsize);
1558                         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1559                         nsize = 0;
1560                 }
1561                 /* Size of symlink equals the length of input string. */
1562                 inode->i_size = size;
1563
1564                 attr->size = cpu_to_le32(asize);
1565
1566                 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1567                                           &new_de->ref);
1568                 if (err)
1569                         goto out5;
1570
1571                 rp_inserted = true;
1572         }
1573
1574         attr = Add2Ptr(attr, asize);
1575         attr->type = ATTR_END;
1576
1577         rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1578         rec->next_attr_id = cpu_to_le16(aid);
1579
1580         /* Step 2: Add new name in index. */
1581         err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1582         if (err)
1583                 goto out6;
1584
1585         /* Unlock parent directory before ntfs_init_acl. */
1586         ni_unlock(dir_ni);
1587
1588         inode->i_generation = le16_to_cpu(rec->seq);
1589
1590         dir->i_mtime = dir->i_ctime = inode->i_atime;
1591
1592         if (S_ISDIR(mode)) {
1593                 inode->i_op = &ntfs_dir_inode_operations;
1594                 inode->i_fop = &ntfs_dir_operations;
1595         } else if (S_ISLNK(mode)) {
1596                 inode->i_op = &ntfs_link_inode_operations;
1597                 inode->i_fop = NULL;
1598                 inode->i_mapping->a_ops = &ntfs_aops;
1599                 inode->i_size = size;
1600                 inode_nohighmem(inode);
1601         } else if (S_ISREG(mode)) {
1602                 inode->i_op = &ntfs_file_inode_operations;
1603                 inode->i_fop = &ntfs_file_operations;
1604                 inode->i_mapping->a_ops =
1605                         is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
1606                 init_rwsem(&ni->file.run_lock);
1607         } else {
1608                 inode->i_op = &ntfs_special_inode_operations;
1609                 init_special_inode(inode, mode, dev);
1610         }
1611
1612 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1613         if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1614                 err = ntfs_init_acl(mnt_userns, inode, dir);
1615                 if (err)
1616                         goto out7;
1617         } else
1618 #endif
1619         {
1620                 inode->i_flags |= S_NOSEC;
1621         }
1622
1623         /* Write non resident data. */
1624         if (nsize) {
1625                 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0);
1626                 if (err)
1627                         goto out7;
1628         }
1629
1630         /*
1631          * Call 'd_instantiate' after inode->i_op is set
1632          * but before finish_open.
1633          */
1634         d_instantiate(dentry, inode);
1635
1636         ntfs_save_wsl_perm(inode);
1637         mark_inode_dirty(dir);
1638         mark_inode_dirty(inode);
1639
1640         /* Normal exit. */
1641         goto out2;
1642
1643 out7:
1644
1645         /* Undo 'indx_insert_entry'. */
1646         ni_lock_dir(dir_ni);
1647         indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
1648                           le16_to_cpu(new_de->key_size), sbi);
1649         /* ni_unlock(dir_ni); will be called later. */
1650 out6:
1651         if (rp_inserted)
1652                 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1653
1654 out5:
1655         if (S_ISDIR(mode) || run_is_empty(&ni->file.run))
1656                 goto out4;
1657
1658         run_deallocate(sbi, &ni->file.run, false);
1659
1660 out4:
1661         clear_rec_inuse(rec);
1662         clear_nlink(inode);
1663         ni->mi.dirty = false;
1664         discard_new_inode(inode);
1665 out3:
1666         ntfs_mark_rec_free(sbi, ino, false);
1667
1668 out2:
1669         __putname(new_de);
1670         kfree(rp);
1671
1672 out1:
1673         if (err) {
1674                 ni_unlock(dir_ni);
1675                 return ERR_PTR(err);
1676         }
1677
1678         unlock_new_inode(inode);
1679
1680         return inode;
1681 }
1682
1683 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1684 {
1685         int err;
1686         struct ntfs_inode *ni = ntfs_i(inode);
1687         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1688         struct NTFS_DE *de;
1689
1690         /* Allocate PATH_MAX bytes. */
1691         de = __getname();
1692         if (!de)
1693                 return -ENOMEM;
1694
1695         /* Mark rw ntfs as dirty. It will be cleared at umount. */
1696         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1697
1698         /* Construct 'de'. */
1699         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1700         if (err)
1701                 goto out;
1702
1703         err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1704 out:
1705         __putname(de);
1706         return err;
1707 }
1708
1709 /*
1710  * ntfs_unlink_inode
1711  *
1712  * inode_operations::unlink
1713  * inode_operations::rmdir
1714  */
1715 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1716 {
1717         int err;
1718         struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1719         struct inode *inode = d_inode(dentry);
1720         struct ntfs_inode *ni = ntfs_i(inode);
1721         struct ntfs_inode *dir_ni = ntfs_i(dir);
1722         struct NTFS_DE *de, *de2 = NULL;
1723         int undo_remove;
1724
1725         if (ntfs_is_meta_file(sbi, ni->mi.rno))
1726                 return -EINVAL;
1727
1728         /* Allocate PATH_MAX bytes. */
1729         de = __getname();
1730         if (!de)
1731                 return -ENOMEM;
1732
1733         ni_lock(ni);
1734
1735         if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1736                 err = -ENOTEMPTY;
1737                 goto out;
1738         }
1739
1740         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1741         if (err < 0)
1742                 goto out;
1743
1744         undo_remove = 0;
1745         err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1746
1747         if (!err) {
1748                 drop_nlink(inode);
1749                 dir->i_mtime = dir->i_ctime = current_time(dir);
1750                 mark_inode_dirty(dir);
1751                 inode->i_ctime = dir->i_ctime;
1752                 if (inode->i_nlink)
1753                         mark_inode_dirty(inode);
1754         } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1755                 _ntfs_bad_inode(inode);
1756         } else {
1757                 if (ni_is_dirty(dir))
1758                         mark_inode_dirty(dir);
1759                 if (ni_is_dirty(inode))
1760                         mark_inode_dirty(inode);
1761         }
1762
1763 out:
1764         ni_unlock(ni);
1765         __putname(de);
1766         return err;
1767 }
1768
1769 void ntfs_evict_inode(struct inode *inode)
1770 {
1771         truncate_inode_pages_final(&inode->i_data);
1772
1773         if (inode->i_nlink)
1774                 _ni_write_inode(inode, inode_needs_sync(inode));
1775
1776         invalidate_inode_buffers(inode);
1777         clear_inode(inode);
1778
1779         ni_clear(ntfs_i(inode));
1780 }
1781
1782 /*
1783  * ntfs_translate_junction
1784  *
1785  * Translate a Windows junction target to the Linux equivalent.
1786  * On junctions, targets are always absolute (they include the drive
1787  * letter). We have no way of knowing if the target is for the current
1788  * mounted device or not so we just assume it is.
1789  */
1790 static int ntfs_translate_junction(const struct super_block *sb,
1791                                    const struct dentry *link_de, char *target,
1792                                    int target_len, int target_max)
1793 {
1794         int tl_len, err = target_len;
1795         char *link_path_buffer = NULL, *link_path;
1796         char *translated = NULL;
1797         char *target_start;
1798         int copy_len;
1799
1800         link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1801         if (!link_path_buffer) {
1802                 err = -ENOMEM;
1803                 goto out;
1804         }
1805         /* Get link path, relative to mount point */
1806         link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1807         if (IS_ERR(link_path)) {
1808                 ntfs_err(sb, "Error getting link path");
1809                 err = -EINVAL;
1810                 goto out;
1811         }
1812
1813         translated = kmalloc(PATH_MAX, GFP_NOFS);
1814         if (!translated) {
1815                 err = -ENOMEM;
1816                 goto out;
1817         }
1818
1819         /* Make translated path a relative path to mount point */
1820         strcpy(translated, "./");
1821         ++link_path;    /* Skip leading / */
1822         for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1823                 if (*link_path == '/') {
1824                         if (PATH_MAX - tl_len < sizeof("../")) {
1825                                 ntfs_err(sb, "Link path %s has too many components",
1826                                          link_path);
1827                                 err = -EINVAL;
1828                                 goto out;
1829                         }
1830                         strcpy(translated + tl_len, "../");
1831                         tl_len += sizeof("../") - 1;
1832                 }
1833         }
1834
1835         /* Skip drive letter */
1836         target_start = target;
1837         while (*target_start && *target_start != ':')
1838                 ++target_start;
1839
1840         if (!*target_start) {
1841                 ntfs_err(sb, "Link target (%s) missing drive separator", target);
1842                 err = -EINVAL;
1843                 goto out;
1844         }
1845
1846         /* Skip drive separator and leading /, if exists */
1847         target_start += 1 + (target_start[1] == '/');
1848         copy_len = target_len - (target_start - target);
1849
1850         if (PATH_MAX - tl_len <= copy_len) {
1851                 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1852                          target_start, PATH_MAX - tl_len, copy_len);
1853                 err = -EINVAL;
1854                 goto out;
1855         }
1856
1857         /* translated path has a trailing / and target_start does not */
1858         strcpy(translated + tl_len, target_start);
1859         tl_len += copy_len;
1860         if (target_max <= tl_len) {
1861                 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1862                          translated, target_max, tl_len);
1863                 err = -EINVAL;
1864                 goto out;
1865         }
1866         strcpy(target, translated);
1867         err = tl_len;
1868
1869 out:
1870         kfree(link_path_buffer);
1871         kfree(translated);
1872         return err;
1873 }
1874
1875 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1876                                       struct inode *inode, char *buffer,
1877                                       int buflen)
1878 {
1879         int i, err = -EINVAL;
1880         struct ntfs_inode *ni = ntfs_i(inode);
1881         struct super_block *sb = inode->i_sb;
1882         struct ntfs_sb_info *sbi = sb->s_fs_info;
1883         u64 size;
1884         u16 ulen = 0;
1885         void *to_free = NULL;
1886         struct REPARSE_DATA_BUFFER *rp;
1887         const __le16 *uname;
1888         struct ATTRIB *attr;
1889
1890         /* Reparse data present. Try to parse it. */
1891         static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1892         static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1893
1894         *buffer = 0;
1895
1896         attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1897         if (!attr)
1898                 goto out;
1899
1900         if (!attr->non_res) {
1901                 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1902                 if (!rp)
1903                         goto out;
1904                 size = le32_to_cpu(attr->res.data_size);
1905         } else {
1906                 size = le64_to_cpu(attr->nres.data_size);
1907                 rp = NULL;
1908         }
1909
1910         if (size > sbi->reparse.max_size || size <= sizeof(u32))
1911                 goto out;
1912
1913         if (!rp) {
1914                 rp = kmalloc(size, GFP_NOFS);
1915                 if (!rp) {
1916                         err = -ENOMEM;
1917                         goto out;
1918                 }
1919                 to_free = rp;
1920                 /* Read into temporal buffer. */
1921                 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1922                 if (err)
1923                         goto out;
1924         }
1925
1926         /* Microsoft Tag. */
1927         switch (rp->ReparseTag) {
1928         case IO_REPARSE_TAG_MOUNT_POINT:
1929                 /* Mount points and junctions. */
1930                 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1931                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1932                                      MountPointReparseBuffer.PathBuffer))
1933                         goto out;
1934                 uname = Add2Ptr(rp,
1935                                 offsetof(struct REPARSE_DATA_BUFFER,
1936                                          MountPointReparseBuffer.PathBuffer) +
1937                                         le16_to_cpu(rp->MountPointReparseBuffer
1938                                                             .PrintNameOffset));
1939                 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1940                 break;
1941
1942         case IO_REPARSE_TAG_SYMLINK:
1943                 /* FolderSymbolicLink */
1944                 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1945                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1946                                      SymbolicLinkReparseBuffer.PathBuffer))
1947                         goto out;
1948                 uname = Add2Ptr(
1949                         rp, offsetof(struct REPARSE_DATA_BUFFER,
1950                                      SymbolicLinkReparseBuffer.PathBuffer) +
1951                                     le16_to_cpu(rp->SymbolicLinkReparseBuffer
1952                                                         .PrintNameOffset));
1953                 ulen = le16_to_cpu(
1954                         rp->SymbolicLinkReparseBuffer.PrintNameLength);
1955                 break;
1956
1957         case IO_REPARSE_TAG_CLOUD:
1958         case IO_REPARSE_TAG_CLOUD_1:
1959         case IO_REPARSE_TAG_CLOUD_2:
1960         case IO_REPARSE_TAG_CLOUD_3:
1961         case IO_REPARSE_TAG_CLOUD_4:
1962         case IO_REPARSE_TAG_CLOUD_5:
1963         case IO_REPARSE_TAG_CLOUD_6:
1964         case IO_REPARSE_TAG_CLOUD_7:
1965         case IO_REPARSE_TAG_CLOUD_8:
1966         case IO_REPARSE_TAG_CLOUD_9:
1967         case IO_REPARSE_TAG_CLOUD_A:
1968         case IO_REPARSE_TAG_CLOUD_B:
1969         case IO_REPARSE_TAG_CLOUD_C:
1970         case IO_REPARSE_TAG_CLOUD_D:
1971         case IO_REPARSE_TAG_CLOUD_E:
1972         case IO_REPARSE_TAG_CLOUD_F:
1973                 err = sizeof("OneDrive") - 1;
1974                 if (err > buflen)
1975                         err = buflen;
1976                 memcpy(buffer, "OneDrive", err);
1977                 goto out;
1978
1979         default:
1980                 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
1981                         /* Unknown Microsoft Tag. */
1982                         goto out;
1983                 }
1984                 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
1985                     size <= sizeof(struct REPARSE_POINT)) {
1986                         goto out;
1987                 }
1988
1989                 /* Users tag. */
1990                 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
1991                 ulen = le16_to_cpu(rp->ReparseDataLength) -
1992                        sizeof(struct REPARSE_POINT);
1993         }
1994
1995         /* Convert nlen from bytes to UNICODE chars. */
1996         ulen >>= 1;
1997
1998         /* Check that name is available. */
1999         if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2000                 goto out;
2001
2002         /* If name is already zero terminated then truncate it now. */
2003         if (!uname[ulen - 1])
2004                 ulen -= 1;
2005
2006         err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2007
2008         if (err < 0)
2009                 goto out;
2010
2011         /* Translate Windows '\' into Linux '/'. */
2012         for (i = 0; i < err; i++) {
2013                 if (buffer[i] == '\\')
2014                         buffer[i] = '/';
2015         }
2016
2017         /* Always set last zero. */
2018         buffer[err] = 0;
2019
2020         /* If this is a junction, translate the link target. */
2021         if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2022                 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2023
2024 out:
2025         kfree(to_free);
2026         return err;
2027 }
2028
2029 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2030                                  struct delayed_call *done)
2031 {
2032         int err;
2033         char *ret;
2034
2035         if (!de)
2036                 return ERR_PTR(-ECHILD);
2037
2038         ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2039         if (!ret)
2040                 return ERR_PTR(-ENOMEM);
2041
2042         err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2043         if (err < 0) {
2044                 kfree(ret);
2045                 return ERR_PTR(err);
2046         }
2047
2048         set_delayed_call(done, kfree_link, ret);
2049
2050         return ret;
2051 }
2052
2053 // clang-format off
2054 const struct inode_operations ntfs_link_inode_operations = {
2055         .get_link       = ntfs_get_link,
2056         .setattr        = ntfs3_setattr,
2057         .listxattr      = ntfs_listxattr,
2058         .permission     = ntfs_permission,
2059         .get_acl        = ntfs_get_acl,
2060         .set_acl        = ntfs_set_acl,
2061 };
2062
2063 const struct address_space_operations ntfs_aops = {
2064         .read_folio     = ntfs_read_folio,
2065         .readahead      = ntfs_readahead,
2066         .writepage      = ntfs_writepage,
2067         .writepages     = ntfs_writepages,
2068         .write_begin    = ntfs_write_begin,
2069         .write_end      = ntfs_write_end,
2070         .direct_IO      = ntfs_direct_IO,
2071         .bmap           = ntfs_bmap,
2072         .dirty_folio    = block_dirty_folio,
2073         .invalidate_folio = block_invalidate_folio,
2074 };
2075
2076 const struct address_space_operations ntfs_aops_cmpr = {
2077         .read_folio     = ntfs_read_folio,
2078         .readahead      = ntfs_readahead,
2079 };
2080 // clang-format on