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         struct timespec64 ctime;
  48
  49         inode->i_op = NULL;
  50         /* Setup 'uid' and 'gid' */
  51         inode->i_uid = sbi->options->fs_uid;
  52         inode->i_gid = sbi->options->fs_gid;
  53
  54         err = mi_init(&ni->mi, sbi, ino);
  55         if (err)
  56                 goto out;
  57
  58         if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
  59                 t64 = sbi->mft.lbo >> sbi->cluster_bits;
  60                 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
  61                 sbi->mft.ni = ni;
  62                 init_rwsem(&ni->file.run_lock);
  63
  64                 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
  65                         err = -ENOMEM;
  66                         goto out;
  67                 }
  68         }
  69
  70         err = mi_read(&ni->mi, ino == MFT_REC_MFT);
  71
  72         if (err)
  73                 goto out;
  74
  75         rec = ni->mi.mrec;
  76
  77         if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
  78                 ;
  79         } else if (ref->seq != rec->seq) {
  80                 err = -EINVAL;
  81                 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
  82                          le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
  83                 goto out;
  84         } else if (!is_rec_inuse(rec)) {
  85                 err = -ESTALE;
  86                 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
  87                 goto out;
  88         }
  89
  90         if (le32_to_cpu(rec->total) != sbi->record_size) {
  91                 /* Bad inode? */
  92                 err = -EINVAL;
  93                 goto out;
  94         }
  95
  96         if (!is_rec_base(rec)) {
  97                 err = -EINVAL;
  98                 goto out;
  99         }
 100
 101         /* Record should contain $I30 root. */
 102         is_dir = rec->flags & RECORD_FLAG_DIR;
 103
 104         /* MFT_REC_MFT is not a dir */
 105         if (is_dir && ino == MFT_REC_MFT) {
 106                 err = -EINVAL;
 107                 goto out;
 108         }
 109
 110         inode->i_generation = le16_to_cpu(rec->seq);
 111
 112         /* Enumerate all struct Attributes MFT. */
 113         le = NULL;
 114         attr = NULL;
 115
 116         /*
 117          * To reduce tab pressure use goto instead of
 118          * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
 119          */
 120 next_attr:
 121         run = NULL;
 122         err = -EINVAL;
 123         attr = ni_enum_attr_ex(ni, attr, &le, NULL);
 124         if (!attr)
 125                 goto end_enum;
 126
 127         if (le && le->vcn) {
 128                 /* This is non primary attribute segment. Ignore if not MFT. */
 129                 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
 130                         goto next_attr;
 131
 132                 run = &ni->file.run;
 133                 asize = le32_to_cpu(attr->size);
 134                 goto attr_unpack_run;
 135         }
 136
 137         roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
 138         rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
 139         asize = le32_to_cpu(attr->size);
 140
 141         /*
 142          * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'.
 143          * There not critical to check this case again
 144          */
 145         if (attr->name_len &&
 146             sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) >
 147                     asize)
 148                 goto out;
 149
 150         if (attr->non_res) {
 151                 t64 = le64_to_cpu(attr->nres.alloc_size);
 152                 if (le64_to_cpu(attr->nres.data_size) > t64 ||
 153                     le64_to_cpu(attr->nres.valid_size) > t64)
 154                         goto out;
 155         }
 156
 157         switch (attr->type) {
 158         case ATTR_STD:
 159                 if (attr->non_res ||
 160                     asize < sizeof(struct ATTR_STD_INFO) + roff ||
 161                     rsize < sizeof(struct ATTR_STD_INFO))
 162                         goto out;
 163
 164                 if (std5)
 165                         goto next_attr;
 166
 167                 std5 = Add2Ptr(attr, roff);
 168
 169 #ifdef STATX_BTIME
 170                 nt2kernel(std5->cr_time, &ni->i_crtime);
 171 #endif
 172                 nt2kernel(std5->a_time, &inode->i_atime);
 173                 nt2kernel(std5->c_time, &ctime);
 174                 inode_set_ctime_to_ts(inode, ctime);
 175                 nt2kernel(std5->m_time, &inode->i_mtime);
 176
 177                 ni->std_fa = std5->fa;
 178
 179                 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
 180                     rsize >= sizeof(struct ATTR_STD_INFO5))
 181                         ni->std_security_id = std5->security_id;
 182                 goto next_attr;
 183
 184         case ATTR_LIST:
 185                 if (attr->name_len || le || ino == MFT_REC_LOG)
 186                         goto out;
 187
 188                 err = ntfs_load_attr_list(ni, attr);
 189                 if (err)
 190                         goto out;
 191
 192                 le = NULL;
 193                 attr = NULL;
 194                 goto next_attr;
 195
 196         case ATTR_NAME:
 197                 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
 198                     rsize < SIZEOF_ATTRIBUTE_FILENAME)
 199                         goto out;
 200
 201                 fname = Add2Ptr(attr, roff);
 202                 if (fname->type == FILE_NAME_DOS)
 203                         goto next_attr;
 204
 205                 names += 1;
 206                 if (name && name->len == fname->name_len &&
 207                     !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
 208                                         NULL, false))
 209                         is_match = true;
 210
 211                 goto next_attr;
 212
 213         case ATTR_DATA:
 214                 if (is_dir) {
 215                         /* Ignore data attribute in dir record. */
 216                         goto next_attr;
 217                 }
 218
 219                 if (ino == MFT_REC_BADCLUST && !attr->non_res)
 220                         goto next_attr;
 221
 222                 if (attr->name_len &&
 223                     ((ino != MFT_REC_BADCLUST || !attr->non_res ||
 224                       attr->name_len != ARRAY_SIZE(BAD_NAME) ||
 225                       memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
 226                      (ino != MFT_REC_SECURE || !attr->non_res ||
 227                       attr->name_len != ARRAY_SIZE(SDS_NAME) ||
 228                       memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
 229                         /* File contains stream attribute. Ignore it. */
 230                         goto next_attr;
 231                 }
 232
 233                 if (is_attr_sparsed(attr))
 234                         ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
 235                 else
 236                         ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
 237
 238                 if (is_attr_compressed(attr))
 239                         ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
 240                 else
 241                         ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
 242
 243                 if (is_attr_encrypted(attr))
 244                         ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
 245                 else
 246                         ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
 247
 248                 if (!attr->non_res) {
 249                         ni->i_valid = inode->i_size = rsize;
 250                         inode_set_bytes(inode, rsize);
 251                 }
 252
 253                 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
 254
 255                 if (!attr->non_res) {
 256                         ni->ni_flags |= NI_FLAG_RESIDENT;
 257                         goto next_attr;
 258                 }
 259
 260                 inode_set_bytes(inode, attr_ondisk_size(attr));
 261
 262                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 263                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 264                 if (!attr->nres.alloc_size)
 265                         goto next_attr;
 266
 267                 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
 268                                               &ni->file.run;
 269                 break;
 270
 271         case ATTR_ROOT:
 272                 if (attr->non_res)
 273                         goto out;
 274
 275                 root = Add2Ptr(attr, roff);
 276
 277                 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
 278                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 279                         goto next_attr;
 280
 281                 if (root->type != ATTR_NAME ||
 282                     root->rule != NTFS_COLLATION_TYPE_FILENAME)
 283                         goto out;
 284
 285                 if (!is_dir)
 286                         goto next_attr;
 287
 288                 is_root = true;
 289                 ni->ni_flags |= NI_FLAG_DIR;
 290
 291                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
 292                 if (err)
 293                         goto out;
 294
 295                 mode = sb->s_root ?
 296                                (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
 297                                (S_IFDIR | 0777);
 298                 goto next_attr;
 299
 300         case ATTR_ALLOC:
 301                 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
 302                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 303                         goto next_attr;
 304
 305                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 306                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 307                 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
 308
 309                 run = &ni->dir.alloc_run;
 310                 break;
 311
 312         case ATTR_BITMAP:
 313                 if (ino == MFT_REC_MFT) {
 314                         if (!attr->non_res)
 315                                 goto out;
 316 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
 317                         /* 0x20000000 = 2^32 / 8 */
 318                         if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
 319                                 goto out;
 320 #endif
 321                         run = &sbi->mft.bitmap.run;
 322                         break;
 323                 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
 324                            !memcmp(attr_name(attr), I30_NAME,
 325                                    sizeof(I30_NAME)) &&
 326                            attr->non_res) {
 327                         run = &ni->dir.bitmap_run;
 328                         break;
 329                 }
 330                 goto next_attr;
 331
 332         case ATTR_REPARSE:
 333                 if (attr->name_len)
 334                         goto next_attr;
 335
 336                 rp_fa = ni_parse_reparse(ni, attr, &rp);
 337                 switch (rp_fa) {
 338                 case REPARSE_LINK:
 339                         /*
 340                          * Normal symlink.
 341                          * Assume one unicode symbol == one utf8.
 342                          */
 343                         inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
 344                                                             .PrintNameLength) /
 345                                         sizeof(u16);
 346
 347                         ni->i_valid = inode->i_size;
 348
 349                         /* Clear directory bit. */
 350                         if (ni->ni_flags & NI_FLAG_DIR) {
 351                                 indx_clear(&ni->dir);
 352                                 memset(&ni->dir, 0, sizeof(ni->dir));
 353                                 ni->ni_flags &= ~NI_FLAG_DIR;
 354                         } else {
 355                                 run_close(&ni->file.run);
 356                         }
 357                         mode = S_IFLNK | 0777;
 358                         is_dir = false;
 359                         if (attr->non_res) {
 360                                 run = &ni->file.run;
 361                                 goto attr_unpack_run; // Double break.
 362                         }
 363                         break;
 364
 365                 case REPARSE_COMPRESSED:
 366                         break;
 367
 368                 case REPARSE_DEDUPLICATED:
 369                         break;
 370                 }
 371                 goto next_attr;
 372
 373         case ATTR_EA_INFO:
 374                 if (!attr->name_len &&
 375                     resident_data_ex(attr, sizeof(struct EA_INFO))) {
 376                         ni->ni_flags |= NI_FLAG_EA;
 377                         /*
 378                          * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
 379                          */
 380                         inode->i_mode = mode;
 381                         ntfs_get_wsl_perm(inode);
 382                         mode = inode->i_mode;
 383                 }
 384                 goto next_attr;
 385
 386         default:
 387                 goto next_attr;
 388         }
 389
 390 attr_unpack_run:
 391         roff = le16_to_cpu(attr->nres.run_off);
 392
 393         if (roff > asize) {
 394                 err = -EINVAL;
 395                 goto out;
 396         }
 397
 398         t64 = le64_to_cpu(attr->nres.svcn);
 399
 400         err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
 401                             t64, Add2Ptr(attr, roff), asize - roff);
 402         if (err < 0)
 403                 goto out;
 404         err = 0;
 405         goto next_attr;
 406
 407 end_enum:
 408
 409         if (!std5)
 410                 goto out;
 411
 412         if (!is_match && name) {
 413                 err = -ENOENT;
 414                 goto out;
 415         }
 416
 417         if (std5->fa & FILE_ATTRIBUTE_READONLY)
 418                 mode &= ~0222;
 419
 420         if (!names) {
 421                 err = -EINVAL;
 422                 goto out;
 423         }
 424
 425         if (names != le16_to_cpu(rec->hard_links)) {
 426                 /* Correct minor error on the fly. Do not mark inode as dirty. */
 427                 ntfs_inode_warn(inode, "Correct links count -> %u.", names);
 428                 rec->hard_links = cpu_to_le16(names);
 429                 ni->mi.dirty = true;
 430         }
 431
 432         set_nlink(inode, names);
 433
 434         if (S_ISDIR(mode)) {
 435                 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
 436
 437                 /*
 438                  * Dot and dot-dot should be included in count but was not
 439                  * included in enumeration.
 440                  * Usually a hard links to directories are disabled.
 441                  */
 442                 inode->i_op = &ntfs_dir_inode_operations;
 443                 inode->i_fop = &ntfs_dir_operations;
 444                 ni->i_valid = 0;
 445         } else if (S_ISLNK(mode)) {
 446                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 447                 inode->i_op = &ntfs_link_inode_operations;
 448                 inode->i_fop = NULL;
 449                 inode_nohighmem(inode);
 450         } else if (S_ISREG(mode)) {
 451                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 452                 inode->i_op = &ntfs_file_inode_operations;
 453                 inode->i_fop = &ntfs_file_operations;
 454                 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
 455                                                               &ntfs_aops;
 456                 if (ino != MFT_REC_MFT)
 457                         init_rwsem(&ni->file.run_lock);
 458         } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
 459                    S_ISSOCK(mode)) {
 460                 inode->i_op = &ntfs_special_inode_operations;
 461                 init_special_inode(inode, mode, inode->i_rdev);
 462         } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
 463                    fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
 464                 /* Records in $Extend are not a files or general directories. */
 465                 inode->i_op = &ntfs_file_inode_operations;
 466         } else {
 467                 err = -EINVAL;
 468                 goto out;
 469         }
 470
 471         if ((sbi->options->sys_immutable &&
 472              (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
 473             !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
 474                 inode->i_flags |= S_IMMUTABLE;
 475         } else {
 476                 inode->i_flags &= ~S_IMMUTABLE;
 477         }
 478
 479         inode->i_mode = mode;
 480         if (!(ni->ni_flags & NI_FLAG_EA)) {
 481                 /* If no xattr then no security (stored in xattr). */
 482                 inode->i_flags |= S_NOSEC;
 483         }
 484
 485         if (ino == MFT_REC_MFT && !sb->s_root)
 486                 sbi->mft.ni = NULL;
 487
 488         unlock_new_inode(inode);
 489
 490         return inode;
 491
 492 out:
 493         if (ino == MFT_REC_MFT && !sb->s_root)
 494                 sbi->mft.ni = NULL;
 495
 496         iget_failed(inode);
 497         return ERR_PTR(err);
 498 }
 499
 500 /*
 501  * ntfs_test_inode
 502  *
 503  * Return: 1 if match.
 504  */
 505 static int ntfs_test_inode(struct inode *inode, void *data)
 506 {
 507         struct MFT_REF *ref = data;
 508
 509         return ino_get(ref) == inode->i_ino;
 510 }
 511
 512 static int ntfs_set_inode(struct inode *inode, void *data)
 513 {
 514         const struct MFT_REF *ref = data;
 515
 516         inode->i_ino = ino_get(ref);
 517         return 0;
 518 }
 519
 520 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
 521                          const struct cpu_str *name)
 522 {
 523         struct inode *inode;
 524
 525         inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
 526                              (void *)ref);
 527         if (unlikely(!inode))
 528                 return ERR_PTR(-ENOMEM);
 529
 530         /* If this is a freshly allocated inode, need to read it now. */
 531         if (inode->i_state & I_NEW)
 532                 inode = ntfs_read_mft(inode, name, ref);
 533         else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
 534                 /* Inode overlaps? */
 535                 _ntfs_bad_inode(inode);
 536         }
 537
 538         if (IS_ERR(inode) && name)
 539                 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
 540
 541         return inode;
 542 }
 543
 544 enum get_block_ctx {
 545         GET_BLOCK_GENERAL = 0,
 546         GET_BLOCK_WRITE_BEGIN = 1,
 547         GET_BLOCK_DIRECT_IO_R = 2,
 548         GET_BLOCK_DIRECT_IO_W = 3,
 549         GET_BLOCK_BMAP = 4,
 550 };
 551
 552 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
 553                                        struct buffer_head *bh, int create,
 554                                        enum get_block_ctx ctx)
 555 {
 556         struct super_block *sb = inode->i_sb;
 557         struct ntfs_sb_info *sbi = sb->s_fs_info;
 558         struct ntfs_inode *ni = ntfs_i(inode);
 559         struct folio *folio = bh->b_folio;
 560         u8 cluster_bits = sbi->cluster_bits;
 561         u32 block_size = sb->s_blocksize;
 562         u64 bytes, lbo, valid;
 563         u32 off;
 564         int err;
 565         CLST vcn, lcn, len;
 566         bool new;
 567
 568         /* Clear previous state. */
 569         clear_buffer_new(bh);
 570         clear_buffer_uptodate(bh);
 571
 572         if (is_resident(ni)) {
 573                 ni_lock(ni);
 574                 err = attr_data_read_resident(ni, &folio->page);
 575                 ni_unlock(ni);
 576
 577                 if (!err)
 578                         set_buffer_uptodate(bh);
 579                 bh->b_size = block_size;
 580                 return err;
 581         }
 582
 583         vcn = vbo >> cluster_bits;
 584         off = vbo & sbi->cluster_mask;
 585         new = false;
 586
 587         err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
 588                                   create && sbi->cluster_size > PAGE_SIZE);
 589         if (err)
 590                 goto out;
 591
 592         if (!len)
 593                 return 0;
 594
 595         bytes = ((u64)len << cluster_bits) - off;
 596
 597         if (lcn == SPARSE_LCN) {
 598                 if (!create) {
 599                         if (bh->b_size > bytes)
 600                                 bh->b_size = bytes;
 601                         return 0;
 602                 }
 603                 WARN_ON(1);
 604         }
 605
 606         if (new)
 607                 set_buffer_new(bh);
 608
 609         lbo = ((u64)lcn << cluster_bits) + off;
 610
 611         set_buffer_mapped(bh);
 612         bh->b_bdev = sb->s_bdev;
 613         bh->b_blocknr = lbo >> sb->s_blocksize_bits;
 614
 615         valid = ni->i_valid;
 616
 617         if (ctx == GET_BLOCK_DIRECT_IO_W) {
 618                 /* ntfs_direct_IO will update ni->i_valid. */
 619                 if (vbo >= valid)
 620                         set_buffer_new(bh);
 621         } else if (create) {
 622                 /* Normal write. */
 623                 if (bytes > bh->b_size)
 624                         bytes = bh->b_size;
 625
 626                 if (vbo >= valid)
 627                         set_buffer_new(bh);
 628
 629                 if (vbo + bytes > valid) {
 630                         ni->i_valid = vbo + bytes;
 631                         mark_inode_dirty(inode);
 632                 }
 633         } else if (vbo >= valid) {
 634                 /* Read out of valid data. */
 635                 clear_buffer_mapped(bh);
 636         } else if (vbo + bytes <= valid) {
 637                 /* Normal read. */
 638         } else if (vbo + block_size <= valid) {
 639                 /* Normal short read. */
 640                 bytes = block_size;
 641         } else {
 642                 /*
 643                  * Read across valid size: vbo < valid && valid < vbo + block_size
 644                  */
 645                 bytes = block_size;
 646
 647                 if (folio) {
 648                         u32 voff = valid - vbo;
 649
 650                         bh->b_size = block_size;
 651                         off = vbo & (PAGE_SIZE - 1);
 652                         folio_set_bh(bh, folio, off);
 653
 654                         err = bh_read(bh, 0);
 655                         if (err < 0)
 656                                 goto out;
 657                         folio_zero_segment(folio, off + voff, off + block_size);
 658                 }
 659         }
 660
 661         if (bh->b_size > bytes)
 662                 bh->b_size = bytes;
 663
 664 #ifndef __LP64__
 665         if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
 666                 static_assert(sizeof(size_t) < sizeof(loff_t));
 667                 if (bytes > 0x40000000u)
 668                         bh->b_size = 0x40000000u;
 669         }
 670 #endif
 671
 672         return 0;
 673
 674 out:
 675         return err;
 676 }
 677
 678 int ntfs_get_block(struct inode *inode, sector_t vbn,
 679                    struct buffer_head *bh_result, int create)
 680 {
 681         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 682                                   bh_result, create, GET_BLOCK_GENERAL);
 683 }
 684
 685 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
 686                                struct buffer_head *bh_result, int create)
 687 {
 688         return ntfs_get_block_vbo(inode,
 689                                   (u64)vsn << inode->i_sb->s_blocksize_bits,
 690                                   bh_result, create, GET_BLOCK_BMAP);
 691 }
 692
 693 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
 694 {
 695         return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
 696 }
 697
 698 static int ntfs_read_folio(struct file *file, struct folio *folio)
 699 {
 700         struct page *page = &folio->page;
 701         int err;
 702         struct address_space *mapping = page->mapping;
 703         struct inode *inode = mapping->host;
 704         struct ntfs_inode *ni = ntfs_i(inode);
 705
 706         if (is_resident(ni)) {
 707                 ni_lock(ni);
 708                 err = attr_data_read_resident(ni, page);
 709                 ni_unlock(ni);
 710                 if (err != E_NTFS_NONRESIDENT) {
 711                         unlock_page(page);
 712                         return err;
 713                 }
 714         }
 715
 716         if (is_compressed(ni)) {
 717                 ni_lock(ni);
 718                 err = ni_readpage_cmpr(ni, page);
 719                 ni_unlock(ni);
 720                 return err;
 721         }
 722
 723         /* Normal + sparse files. */
 724         return mpage_read_folio(folio, ntfs_get_block);
 725 }
 726
 727 static void ntfs_readahead(struct readahead_control *rac)
 728 {
 729         struct address_space *mapping = rac->mapping;
 730         struct inode *inode = mapping->host;
 731         struct ntfs_inode *ni = ntfs_i(inode);
 732         u64 valid;
 733         loff_t pos;
 734
 735         if (is_resident(ni)) {
 736                 /* No readahead for resident. */
 737                 return;
 738         }
 739
 740         if (is_compressed(ni)) {
 741                 /* No readahead for compressed. */
 742                 return;
 743         }
 744
 745         valid = ni->i_valid;
 746         pos = readahead_pos(rac);
 747
 748         if (valid < i_size_read(inode) && pos <= valid &&
 749             valid < pos + readahead_length(rac)) {
 750                 /* Range cross 'valid'. Read it page by page. */
 751                 return;
 752         }
 753
 754         mpage_readahead(rac, ntfs_get_block);
 755 }
 756
 757 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
 758                                       struct buffer_head *bh_result, int create)
 759 {
 760         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 761                                   bh_result, create, GET_BLOCK_DIRECT_IO_R);
 762 }
 763
 764 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
 765                                       struct buffer_head *bh_result, int create)
 766 {
 767         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 768                                   bh_result, create, GET_BLOCK_DIRECT_IO_W);
 769 }
 770
 771 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 772 {
 773         struct file *file = iocb->ki_filp;
 774         struct address_space *mapping = file->f_mapping;
 775         struct inode *inode = mapping->host;
 776         struct ntfs_inode *ni = ntfs_i(inode);
 777         loff_t vbo = iocb->ki_pos;
 778         loff_t end;
 779         int wr = iov_iter_rw(iter) & WRITE;
 780         size_t iter_count = iov_iter_count(iter);
 781         loff_t valid;
 782         ssize_t ret;
 783
 784         if (is_resident(ni)) {
 785                 /* Switch to buffered write. */
 786                 ret = 0;
 787                 goto out;
 788         }
 789
 790         ret = blockdev_direct_IO(iocb, inode, iter,
 791                                  wr ? ntfs_get_block_direct_IO_W :
 792                                       ntfs_get_block_direct_IO_R);
 793
 794         if (ret > 0)
 795                 end = vbo + ret;
 796         else if (wr && ret == -EIOCBQUEUED)
 797                 end = vbo + iter_count;
 798         else
 799                 goto out;
 800
 801         valid = ni->i_valid;
 802         if (wr) {
 803                 if (end > valid && !S_ISBLK(inode->i_mode)) {
 804                         ni->i_valid = end;
 805                         mark_inode_dirty(inode);
 806                 }
 807         } else if (vbo < valid && valid < end) {
 808                 /* Fix page. */
 809                 iov_iter_revert(iter, end - valid);
 810                 iov_iter_zero(end - valid, iter);
 811         }
 812
 813 out:
 814         return ret;
 815 }
 816
 817 int ntfs_set_size(struct inode *inode, u64 new_size)
 818 {
 819         struct super_block *sb = inode->i_sb;
 820         struct ntfs_sb_info *sbi = sb->s_fs_info;
 821         struct ntfs_inode *ni = ntfs_i(inode);
 822         int err;
 823
 824         /* Check for maximum file size. */
 825         if (is_sparsed(ni) || is_compressed(ni)) {
 826                 if (new_size > sbi->maxbytes_sparse) {
 827                         err = -EFBIG;
 828                         goto out;
 829                 }
 830         } else if (new_size > sbi->maxbytes) {
 831                 err = -EFBIG;
 832                 goto out;
 833         }
 834
 835         ni_lock(ni);
 836         down_write(&ni->file.run_lock);
 837
 838         err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 839                             &ni->i_valid, true, NULL);
 840
 841         up_write(&ni->file.run_lock);
 842         ni_unlock(ni);
 843
 844         mark_inode_dirty(inode);
 845
 846 out:
 847         return err;
 848 }
 849
 850 static int ntfs_resident_writepage(struct folio *folio,
 851                                    struct writeback_control *wbc, void *data)
 852 {
 853         struct address_space *mapping = data;
 854         struct inode *inode = mapping->host;
 855         struct ntfs_inode *ni = ntfs_i(inode);
 856         int ret;
 857
 858         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 859                 return -EIO;
 860
 861         ni_lock(ni);
 862         ret = attr_data_write_resident(ni, &folio->page);
 863         ni_unlock(ni);
 864
 865         if (ret != E_NTFS_NONRESIDENT)
 866                 folio_unlock(folio);
 867         mapping_set_error(mapping, ret);
 868         return ret;
 869 }
 870
 871 static int ntfs_writepages(struct address_space *mapping,
 872                            struct writeback_control *wbc)
 873 {
 874         struct inode *inode = mapping->host;
 875
 876         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 877                 return -EIO;
 878
 879         if (is_resident(ntfs_i(inode)))
 880                 return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
 881                                          mapping);
 882         return mpage_writepages(mapping, wbc, ntfs_get_block);
 883 }
 884
 885 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
 886                                       struct buffer_head *bh_result, int create)
 887 {
 888         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 889                                   bh_result, create, GET_BLOCK_WRITE_BEGIN);
 890 }
 891
 892 int ntfs_write_begin(struct file *file, struct address_space *mapping,
 893                      loff_t pos, u32 len, struct page **pagep, void **fsdata)
 894 {
 895         int err;
 896         struct inode *inode = mapping->host;
 897         struct ntfs_inode *ni = ntfs_i(inode);
 898
 899         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 900                 return -EIO;
 901
 902         *pagep = NULL;
 903         if (is_resident(ni)) {
 904                 struct page *page =
 905                         grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT);
 906
 907                 if (!page) {
 908                         err = -ENOMEM;
 909                         goto out;
 910                 }
 911
 912                 ni_lock(ni);
 913                 err = attr_data_read_resident(ni, page);
 914                 ni_unlock(ni);
 915
 916                 if (!err) {
 917                         *pagep = page;
 918                         goto out;
 919                 }
 920                 unlock_page(page);
 921                 put_page(page);
 922
 923                 if (err != E_NTFS_NONRESIDENT)
 924                         goto out;
 925         }
 926
 927         err = block_write_begin(mapping, pos, len, pagep,
 928                                 ntfs_get_block_write_begin);
 929
 930 out:
 931         return err;
 932 }
 933
 934 /*
 935  * ntfs_write_end - Address_space_operations::write_end.
 936  */
 937 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
 938                    u32 len, u32 copied, struct page *page, void *fsdata)
 939 {
 940         struct inode *inode = mapping->host;
 941         struct ntfs_inode *ni = ntfs_i(inode);
 942         u64 valid = ni->i_valid;
 943         bool dirty = false;
 944         int err;
 945
 946         if (is_resident(ni)) {
 947                 ni_lock(ni);
 948                 err = attr_data_write_resident(ni, page);
 949                 ni_unlock(ni);
 950                 if (!err) {
 951                         dirty = true;
 952                         /* Clear any buffers in page. */
 953                         if (page_has_buffers(page)) {
 954                                 struct buffer_head *head, *bh;
 955
 956                                 bh = head = page_buffers(page);
 957                                 do {
 958                                         clear_buffer_dirty(bh);
 959                                         clear_buffer_mapped(bh);
 960                                         set_buffer_uptodate(bh);
 961                                 } while (head != (bh = bh->b_this_page));
 962                         }
 963                         SetPageUptodate(page);
 964                         err = copied;
 965                 }
 966                 unlock_page(page);
 967                 put_page(page);
 968         } else {
 969                 err = generic_write_end(file, mapping, pos, len, copied, page,
 970                                         fsdata);
 971         }
 972
 973         if (err >= 0) {
 974                 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
 975                         inode->i_mtime = inode_set_ctime_current(inode);
 976                         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 977                         dirty = true;
 978                 }
 979
 980                 if (valid != ni->i_valid) {
 981                         /* ni->i_valid is changed in ntfs_get_block_vbo. */
 982                         dirty = true;
 983                 }
 984
 985                 if (pos + err > inode->i_size) {
 986                         i_size_write(inode, pos + err);
 987                         dirty = true;
 988                 }
 989
 990                 if (dirty)
 991                         mark_inode_dirty(inode);
 992         }
 993
 994         return err;
 995 }
 996
 997 int reset_log_file(struct inode *inode)
 998 {
 999         int err;
1000         loff_t pos = 0;
1001         u32 log_size = inode->i_size;
1002         struct address_space *mapping = inode->i_mapping;
1003
1004         for (;;) {
1005                 u32 len;
1006                 void *kaddr;
1007                 struct page *page;
1008
1009                 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
1010
1011                 err = block_write_begin(mapping, pos, len, &page,
1012                                         ntfs_get_block_write_begin);
1013                 if (err)
1014                         goto out;
1015
1016                 kaddr = kmap_atomic(page);
1017                 memset(kaddr, -1, len);
1018                 kunmap_atomic(kaddr);
1019                 flush_dcache_page(page);
1020
1021                 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
1022                 if (err < 0)
1023                         goto out;
1024                 pos += len;
1025
1026                 if (pos >= log_size)
1027                         break;
1028                 balance_dirty_pages_ratelimited(mapping);
1029         }
1030 out:
1031         mark_inode_dirty_sync(inode);
1032
1033         return err;
1034 }
1035
1036 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1037 {
1038         return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1039 }
1040
1041 int ntfs_sync_inode(struct inode *inode)
1042 {
1043         return _ni_write_inode(inode, 1);
1044 }
1045
1046 /*
1047  * writeback_inode - Helper function for ntfs_flush_inodes().
1048  *
1049  * This writes both the inode and the file data blocks, waiting
1050  * for in flight data blocks before the start of the call.  It
1051  * does not wait for any io started during the call.
1052  */
1053 static int writeback_inode(struct inode *inode)
1054 {
1055         int ret = sync_inode_metadata(inode, 0);
1056
1057         if (!ret)
1058                 ret = filemap_fdatawrite(inode->i_mapping);
1059         return ret;
1060 }
1061
1062 /*
1063  * ntfs_flush_inodes
1064  *
1065  * Write data and metadata corresponding to i1 and i2.  The io is
1066  * started but we do not wait for any of it to finish.
1067  *
1068  * filemap_flush() is used for the block device, so if there is a dirty
1069  * page for a block already in flight, we will not wait and start the
1070  * io over again.
1071  */
1072 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1073                       struct inode *i2)
1074 {
1075         int ret = 0;
1076
1077         if (i1)
1078                 ret = writeback_inode(i1);
1079         if (!ret && i2)
1080                 ret = writeback_inode(i2);
1081         if (!ret)
1082                 ret = sync_blockdev_nowait(sb->s_bdev);
1083         return ret;
1084 }
1085
1086 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1087 {
1088         pgoff_t idx;
1089
1090         /* Write non resident data. */
1091         for (idx = 0; bytes; idx++) {
1092                 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1093                 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1094
1095                 if (IS_ERR(page))
1096                         return PTR_ERR(page);
1097
1098                 lock_page(page);
1099                 WARN_ON(!PageUptodate(page));
1100                 ClearPageUptodate(page);
1101
1102                 memcpy(page_address(page), data, op);
1103
1104                 flush_dcache_page(page);
1105                 SetPageUptodate(page);
1106                 unlock_page(page);
1107
1108                 ntfs_unmap_page(page);
1109
1110                 bytes -= op;
1111                 data = Add2Ptr(data, PAGE_SIZE);
1112         }
1113         return 0;
1114 }
1115
1116 /*
1117  * ntfs_reparse_bytes
1118  *
1119  * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1120  * for unicode string of @uni_len length.
1121  */
1122 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1123 {
1124         /* Header + unicode string + decorated unicode string. */
1125         return sizeof(short) * (2 * uni_len + 4) +
1126                offsetof(struct REPARSE_DATA_BUFFER,
1127                         SymbolicLinkReparseBuffer.PathBuffer);
1128 }
1129
1130 static struct REPARSE_DATA_BUFFER *
1131 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1132                            u32 size, u16 *nsize)
1133 {
1134         int i, err;
1135         struct REPARSE_DATA_BUFFER *rp;
1136         __le16 *rp_name;
1137         typeof(rp->SymbolicLinkReparseBuffer) *rs;
1138
1139         rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1140         if (!rp)
1141                 return ERR_PTR(-ENOMEM);
1142
1143         rs = &rp->SymbolicLinkReparseBuffer;
1144         rp_name = rs->PathBuffer;
1145
1146         /* Convert link name to UTF-16. */
1147         err = ntfs_nls_to_utf16(sbi, symname, size,
1148                                 (struct cpu_str *)(rp_name - 1), 2 * size,
1149                                 UTF16_LITTLE_ENDIAN);
1150         if (err < 0)
1151                 goto out;
1152
1153         /* err = the length of unicode name of symlink. */
1154         *nsize = ntfs_reparse_bytes(err);
1155
1156         if (*nsize > sbi->reparse.max_size) {
1157                 err = -EFBIG;
1158                 goto out;
1159         }
1160
1161         /* Translate Linux '/' into Windows '\'. */
1162         for (i = 0; i < err; i++) {
1163                 if (rp_name[i] == cpu_to_le16('/'))
1164                         rp_name[i] = cpu_to_le16('\\');
1165         }
1166
1167         rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1168         rp->ReparseDataLength =
1169                 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1170                                               SymbolicLinkReparseBuffer));
1171
1172         /* PrintName + SubstituteName. */
1173         rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1174         rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1175         rs->PrintNameLength = rs->SubstituteNameOffset;
1176
1177         /*
1178          * TODO: Use relative path if possible to allow Windows to
1179          * parse this path.
1180          * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1181          */
1182         rs->Flags = 0;
1183
1184         memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1185
1186         /* Decorate SubstituteName. */
1187         rp_name += err;
1188         rp_name[0] = cpu_to_le16('\\');
1189         rp_name[1] = cpu_to_le16('?');
1190         rp_name[2] = cpu_to_le16('?');
1191         rp_name[3] = cpu_to_le16('\\');
1192
1193         return rp;
1194 out:
1195         kfree(rp);
1196         return ERR_PTR(err);
1197 }
1198
1199 /*
1200  * ntfs_create_inode
1201  *
1202  * Helper function for:
1203  * - ntfs_create
1204  * - ntfs_mknod
1205  * - ntfs_symlink
1206  * - ntfs_mkdir
1207  * - ntfs_atomic_open
1208  *
1209  * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1210  */
1211 struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1212                                 struct dentry *dentry,
1213                                 const struct cpu_str *uni, umode_t mode,
1214                                 dev_t dev, const char *symname, u32 size,
1215                                 struct ntfs_fnd *fnd)
1216 {
1217         int err;
1218         struct super_block *sb = dir->i_sb;
1219         struct ntfs_sb_info *sbi = sb->s_fs_info;
1220         const struct qstr *name = &dentry->d_name;
1221         CLST ino = 0;
1222         struct ntfs_inode *dir_ni = ntfs_i(dir);
1223         struct ntfs_inode *ni = NULL;
1224         struct inode *inode = NULL;
1225         struct ATTRIB *attr;
1226         struct ATTR_STD_INFO5 *std5;
1227         struct ATTR_FILE_NAME *fname;
1228         struct MFT_REC *rec;
1229         u32 asize, dsize, sd_size;
1230         enum FILE_ATTRIBUTE fa;
1231         __le32 security_id = SECURITY_ID_INVALID;
1232         CLST vcn;
1233         const void *sd;
1234         u16 t16, nsize = 0, aid = 0;
1235         struct INDEX_ROOT *root, *dir_root;
1236         struct NTFS_DE *e, *new_de = NULL;
1237         struct REPARSE_DATA_BUFFER *rp = NULL;
1238         bool rp_inserted = false;
1239
1240         if (!fnd)
1241                 ni_lock_dir(dir_ni);
1242
1243         dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1244         if (!dir_root) {
1245                 err = -EINVAL;
1246                 goto out1;
1247         }
1248
1249         if (S_ISDIR(mode)) {
1250                 /* Use parent's directory attributes. */
1251                 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1252                      FILE_ATTRIBUTE_ARCHIVE;
1253                 /*
1254                  * By default child directory inherits parent attributes.
1255                  * Root directory is hidden + system.
1256                  * Make an exception for children in root.
1257                  */
1258                 if (dir->i_ino == MFT_REC_ROOT)
1259                         fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1260         } else if (S_ISLNK(mode)) {
1261                 /* It is good idea that link should be the same type (file/dir) as target */
1262                 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1263
1264                 /*
1265                  * Linux: there are dir/file/symlink and so on.
1266                  * NTFS: symlinks are "dir + reparse" or "file + reparse"
1267                  * It is good idea to create:
1268                  * dir + reparse if 'symname' points to directory
1269                  * or
1270                  * file + reparse if 'symname' points to file
1271                  * Unfortunately kern_path hangs if symname contains 'dir'.
1272                  */
1273
1274                 /*
1275                  *      struct path path;
1276                  *
1277                  *      if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1278                  *              struct inode *target = d_inode(path.dentry);
1279                  *
1280                  *              if (S_ISDIR(target->i_mode))
1281                  *                      fa |= FILE_ATTRIBUTE_DIRECTORY;
1282                  *              // if ( target->i_sb == sb ){
1283                  *              //      use relative path?
1284                  *              // }
1285                  *              path_put(&path);
1286                  *      }
1287                  */
1288         } else if (S_ISREG(mode)) {
1289                 if (sbi->options->sparse) {
1290                         /* Sparsed regular file, cause option 'sparse'. */
1291                         fa = FILE_ATTRIBUTE_SPARSE_FILE |
1292                              FILE_ATTRIBUTE_ARCHIVE;
1293                 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1294                         /* Compressed regular file, if parent is compressed. */
1295                         fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1296                 } else {
1297                         /* Regular file, default attributes. */
1298                         fa = FILE_ATTRIBUTE_ARCHIVE;
1299                 }
1300         } else {
1301                 fa = FILE_ATTRIBUTE_ARCHIVE;
1302         }
1303
1304         /* If option "hide_dot_files" then set hidden attribute for dot files. */
1305         if (sbi->options->hide_dot_files && name->name[0] == '.')
1306                 fa |= FILE_ATTRIBUTE_HIDDEN;
1307
1308         if (!(mode & 0222))
1309                 fa |= FILE_ATTRIBUTE_READONLY;
1310
1311         /* Allocate PATH_MAX bytes. */
1312         new_de = __getname();
1313         if (!new_de) {
1314                 err = -ENOMEM;
1315                 goto out1;
1316         }
1317
1318         if (unlikely(ntfs3_forced_shutdown(sb))) {
1319                 err = -EIO;
1320                 goto out2;
1321         }
1322
1323         /* Mark rw ntfs as dirty. it will be cleared at umount. */
1324         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1325
1326         /* Step 1: allocate and fill new mft record. */
1327         err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1328         if (err)
1329                 goto out2;
1330
1331         ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1332         if (IS_ERR(ni)) {
1333                 err = PTR_ERR(ni);
1334                 ni = NULL;
1335                 goto out3;
1336         }
1337         inode = &ni->vfs_inode;
1338         inode_init_owner(idmap, inode, dir, mode);
1339         mode = inode->i_mode;
1340
1341         ni->i_crtime = current_time(inode);
1342
1343         rec = ni->mi.mrec;
1344         rec->hard_links = cpu_to_le16(1);
1345         attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1346
1347         /* Get default security id. */
1348         sd = s_default_security;
1349         sd_size = sizeof(s_default_security);
1350
1351         if (is_ntfs3(sbi)) {
1352                 security_id = dir_ni->std_security_id;
1353                 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1354                         security_id = sbi->security.def_security_id;
1355
1356                         if (security_id == SECURITY_ID_INVALID &&
1357                             !ntfs_insert_security(sbi, sd, sd_size,
1358                                                   &security_id, NULL))
1359                                 sbi->security.def_security_id = security_id;
1360                 }
1361         }
1362
1363         /* Insert standard info. */
1364         std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1365
1366         if (security_id == SECURITY_ID_INVALID) {
1367                 dsize = sizeof(struct ATTR_STD_INFO);
1368         } else {
1369                 dsize = sizeof(struct ATTR_STD_INFO5);
1370                 std5->security_id = security_id;
1371                 ni->std_security_id = security_id;
1372         }
1373         asize = SIZEOF_RESIDENT + dsize;
1374
1375         attr->type = ATTR_STD;
1376         attr->size = cpu_to_le32(asize);
1377         attr->id = cpu_to_le16(aid++);
1378         attr->res.data_off = SIZEOF_RESIDENT_LE;
1379         attr->res.data_size = cpu_to_le32(dsize);
1380
1381         std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1382                 kernel2nt(&ni->i_crtime);
1383
1384         std5->fa = ni->std_fa = fa;
1385
1386         attr = Add2Ptr(attr, asize);
1387
1388         /* Insert file name. */
1389         err = fill_name_de(sbi, new_de, name, uni);
1390         if (err)
1391                 goto out4;
1392
1393         mi_get_ref(&ni->mi, &new_de->ref);
1394
1395         fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1396
1397         if (sbi->options->windows_names &&
1398             !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1399                 err = -EINVAL;
1400                 goto out4;
1401         }
1402
1403         mi_get_ref(&dir_ni->mi, &fname->home);
1404         fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1405                 fname->dup.a_time = std5->cr_time;
1406         fname->dup.alloc_size = fname->dup.data_size = 0;
1407         fname->dup.fa = std5->fa;
1408         fname->dup.ea_size = fname->dup.reparse = 0;
1409
1410         dsize = le16_to_cpu(new_de->key_size);
1411         asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1412
1413         attr->type = ATTR_NAME;
1414         attr->size = cpu_to_le32(asize);
1415         attr->res.data_off = SIZEOF_RESIDENT_LE;
1416         attr->res.flags = RESIDENT_FLAG_INDEXED;
1417         attr->id = cpu_to_le16(aid++);
1418         attr->res.data_size = cpu_to_le32(dsize);
1419         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1420
1421         attr = Add2Ptr(attr, asize);
1422
1423         if (security_id == SECURITY_ID_INVALID) {
1424                 /* Insert security attribute. */
1425                 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1426
1427                 attr->type = ATTR_SECURE;
1428                 attr->size = cpu_to_le32(asize);
1429                 attr->id = cpu_to_le16(aid++);
1430                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1431                 attr->res.data_size = cpu_to_le32(sd_size);
1432                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1433
1434                 attr = Add2Ptr(attr, asize);
1435         }
1436
1437         attr->id = cpu_to_le16(aid++);
1438         if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1439                 /*
1440                  * Regular directory or symlink to directory.
1441                  * Create root attribute.
1442                  */
1443                 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1444                 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1445
1446                 attr->type = ATTR_ROOT;
1447                 attr->size = cpu_to_le32(asize);
1448
1449                 attr->name_len = ARRAY_SIZE(I30_NAME);
1450                 attr->name_off = SIZEOF_RESIDENT_LE;
1451                 attr->res.data_off =
1452                         cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1453                 attr->res.data_size = cpu_to_le32(dsize);
1454                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1455                        sizeof(I30_NAME));
1456
1457                 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1458                 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1459                 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1460                 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1461                                               sizeof(struct NTFS_DE));
1462                 root->ihdr.total = root->ihdr.used;
1463
1464                 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1465                 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1466                 e->flags = NTFS_IE_LAST;
1467         } else if (S_ISLNK(mode)) {
1468                 /*
1469                  * Symlink to file.
1470                  * Create empty resident data attribute.
1471                  */
1472                 asize = SIZEOF_RESIDENT;
1473
1474                 /* Insert empty ATTR_DATA */
1475                 attr->type = ATTR_DATA;
1476                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1477                 attr->name_off = SIZEOF_RESIDENT_LE;
1478                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1479         } else if (S_ISREG(mode)) {
1480                 /*
1481                  * Regular file. Create empty non resident data attribute.
1482                  */
1483                 attr->type = ATTR_DATA;
1484                 attr->non_res = 1;
1485                 attr->nres.evcn = cpu_to_le64(-1ll);
1486                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1487                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1488                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1489                         attr->flags = ATTR_FLAG_SPARSED;
1490                         asize = SIZEOF_NONRESIDENT_EX + 8;
1491                 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1492                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1493                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1494                         attr->flags = ATTR_FLAG_COMPRESSED;
1495                         attr->nres.c_unit = COMPRESSION_UNIT;
1496                         asize = SIZEOF_NONRESIDENT_EX + 8;
1497                 } else {
1498                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1499                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1500                         asize = SIZEOF_NONRESIDENT + 8;
1501                 }
1502                 attr->nres.run_off = attr->name_off;
1503         } else {
1504                 /*
1505                  * Node. Create empty resident data attribute.
1506                  */
1507                 attr->type = ATTR_DATA;
1508                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1509                 attr->name_off = SIZEOF_RESIDENT_LE;
1510                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1511                         attr->flags = ATTR_FLAG_SPARSED;
1512                 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1513                         attr->flags = ATTR_FLAG_COMPRESSED;
1514                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1515                 asize = SIZEOF_RESIDENT;
1516                 ni->ni_flags |= NI_FLAG_RESIDENT;
1517         }
1518
1519         if (S_ISDIR(mode)) {
1520                 ni->ni_flags |= NI_FLAG_DIR;
1521                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1522                 if (err)
1523                         goto out4;
1524         } else if (S_ISLNK(mode)) {
1525                 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1526
1527                 if (IS_ERR(rp)) {
1528                         err = PTR_ERR(rp);
1529                         rp = NULL;
1530                         goto out4;
1531                 }
1532
1533                 /*
1534                  * Insert ATTR_REPARSE.
1535                  */
1536                 attr = Add2Ptr(attr, asize);
1537                 attr->type = ATTR_REPARSE;
1538                 attr->id = cpu_to_le16(aid++);
1539
1540                 /* Resident or non resident? */
1541                 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1542                 t16 = PtrOffset(rec, attr);
1543
1544                 /*
1545                  * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1546                  * It is good idea to keep extened attributes resident.
1547                  */
1548                 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1549                         CLST alen;
1550                         CLST clst = bytes_to_cluster(sbi, nsize);
1551
1552                         /* Bytes per runs. */
1553                         t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1554
1555                         attr->non_res = 1;
1556                         attr->nres.evcn = cpu_to_le64(clst - 1);
1557                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1558                         attr->nres.run_off = attr->name_off;
1559                         attr->nres.data_size = cpu_to_le64(nsize);
1560                         attr->nres.valid_size = attr->nres.data_size;
1561                         attr->nres.alloc_size =
1562                                 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1563
1564                         err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1565                                                      clst, NULL, ALLOCATE_DEF,
1566                                                      &alen, 0, NULL, NULL);
1567                         if (err)
1568                                 goto out5;
1569
1570                         err = run_pack(&ni->file.run, 0, clst,
1571                                        Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1572                                        &vcn);
1573                         if (err < 0)
1574                                 goto out5;
1575
1576                         if (vcn != clst) {
1577                                 err = -EINVAL;
1578                                 goto out5;
1579                         }
1580
1581                         asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1582                         /* Write non resident data. */
1583                         err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1584                                                 nsize, 0);
1585                         if (err)
1586                                 goto out5;
1587                 } else {
1588                         attr->res.data_off = SIZEOF_RESIDENT_LE;
1589                         attr->res.data_size = cpu_to_le32(nsize);
1590                         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1591                 }
1592                 /* Size of symlink equals the length of input string. */
1593                 inode->i_size = size;
1594
1595                 attr->size = cpu_to_le32(asize);
1596
1597                 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1598                                           &new_de->ref);
1599                 if (err)
1600                         goto out5;
1601
1602                 rp_inserted = true;
1603         }
1604
1605         attr = Add2Ptr(attr, asize);
1606         attr->type = ATTR_END;
1607
1608         rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1609         rec->next_attr_id = cpu_to_le16(aid);
1610
1611         inode->i_generation = le16_to_cpu(rec->seq);
1612
1613         if (S_ISDIR(mode)) {
1614                 inode->i_op = &ntfs_dir_inode_operations;
1615                 inode->i_fop = &ntfs_dir_operations;
1616         } else if (S_ISLNK(mode)) {
1617                 inode->i_op = &ntfs_link_inode_operations;
1618                 inode->i_fop = NULL;
1619                 inode->i_mapping->a_ops = &ntfs_aops;
1620                 inode->i_size = size;
1621                 inode_nohighmem(inode);
1622         } else if (S_ISREG(mode)) {
1623                 inode->i_op = &ntfs_file_inode_operations;
1624                 inode->i_fop = &ntfs_file_operations;
1625                 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1626                                                               &ntfs_aops;
1627                 init_rwsem(&ni->file.run_lock);
1628         } else {
1629                 inode->i_op = &ntfs_special_inode_operations;
1630                 init_special_inode(inode, mode, dev);
1631         }
1632
1633 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1634         if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1635                 err = ntfs_init_acl(idmap, inode, dir);
1636                 if (err)
1637                         goto out5;
1638         } else
1639 #endif
1640         {
1641                 inode->i_flags |= S_NOSEC;
1642         }
1643
1644         /*
1645          * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1646          * The packed size of extended attribute is stored in direntry too.
1647          * 'fname' here points to inside new_de.
1648          */
1649         ntfs_save_wsl_perm(inode, &fname->dup.ea_size);
1650
1651         /*
1652          * update ea_size in file_name attribute too.
1653          * Use ni_find_attr cause layout of MFT record may be changed
1654          * in ntfs_init_acl and ntfs_save_wsl_perm.
1655          */
1656         attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
1657         if (attr) {
1658                 struct ATTR_FILE_NAME *fn;
1659
1660                 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1661                 if (fn)
1662                         fn->dup.ea_size = fname->dup.ea_size;
1663         }
1664
1665         /* We do not need to update parent directory later */
1666         ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1667
1668         /* Step 2: Add new name in index. */
1669         err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1670         if (err)
1671                 goto out6;
1672
1673         /*
1674          * Call 'd_instantiate' after inode->i_op is set
1675          * but before finish_open.
1676          */
1677         d_instantiate(dentry, inode);
1678
1679         /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1680         inode->i_atime = inode->i_mtime =
1681                 inode_set_ctime_to_ts(inode, ni->i_crtime);
1682         dir->i_mtime = inode_set_ctime_to_ts(dir, ni->i_crtime);
1683
1684         mark_inode_dirty(dir);
1685         mark_inode_dirty(inode);
1686
1687         /* Normal exit. */
1688         goto out2;
1689
1690 out6:
1691         if (rp_inserted)
1692                 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1693
1694 out5:
1695         if (!S_ISDIR(mode))
1696                 run_deallocate(sbi, &ni->file.run, false);
1697
1698 out4:
1699         clear_rec_inuse(rec);
1700         clear_nlink(inode);
1701         ni->mi.dirty = false;
1702         discard_new_inode(inode);
1703 out3:
1704         ntfs_mark_rec_free(sbi, ino, false);
1705
1706 out2:
1707         __putname(new_de);
1708         kfree(rp);
1709
1710 out1:
1711         if (!fnd)
1712                 ni_unlock(dir_ni);
1713
1714         if (err)
1715                 return ERR_PTR(err);
1716
1717         unlock_new_inode(inode);
1718
1719         return inode;
1720 }
1721
1722 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1723 {
1724         int err;
1725         struct ntfs_inode *ni = ntfs_i(inode);
1726         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1727         struct NTFS_DE *de;
1728
1729         /* Allocate PATH_MAX bytes. */
1730         de = __getname();
1731         if (!de)
1732                 return -ENOMEM;
1733
1734         /* Mark rw ntfs as dirty. It will be cleared at umount. */
1735         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1736
1737         /* Construct 'de'. */
1738         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1739         if (err)
1740                 goto out;
1741
1742         err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1743 out:
1744         __putname(de);
1745         return err;
1746 }
1747
1748 /*
1749  * ntfs_unlink_inode
1750  *
1751  * inode_operations::unlink
1752  * inode_operations::rmdir
1753  */
1754 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1755 {
1756         int err;
1757         struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1758         struct inode *inode = d_inode(dentry);
1759         struct ntfs_inode *ni = ntfs_i(inode);
1760         struct ntfs_inode *dir_ni = ntfs_i(dir);
1761         struct NTFS_DE *de, *de2 = NULL;
1762         int undo_remove;
1763
1764         if (ntfs_is_meta_file(sbi, ni->mi.rno))
1765                 return -EINVAL;
1766
1767         /* Allocate PATH_MAX bytes. */
1768         de = __getname();
1769         if (!de)
1770                 return -ENOMEM;
1771
1772         ni_lock(ni);
1773
1774         if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1775                 err = -ENOTEMPTY;
1776                 goto out;
1777         }
1778
1779         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1780         if (err < 0)
1781                 goto out;
1782
1783         undo_remove = 0;
1784         err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1785
1786         if (!err) {
1787                 drop_nlink(inode);
1788                 dir->i_mtime = inode_set_ctime_current(dir);
1789                 mark_inode_dirty(dir);
1790                 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1791                 if (inode->i_nlink)
1792                         mark_inode_dirty(inode);
1793         } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1794                 _ntfs_bad_inode(inode);
1795         } else {
1796                 if (ni_is_dirty(dir))
1797                         mark_inode_dirty(dir);
1798                 if (ni_is_dirty(inode))
1799                         mark_inode_dirty(inode);
1800         }
1801
1802 out:
1803         ni_unlock(ni);
1804         __putname(de);
1805         return err;
1806 }
1807
1808 void ntfs_evict_inode(struct inode *inode)
1809 {
1810         truncate_inode_pages_final(&inode->i_data);
1811
1812         invalidate_inode_buffers(inode);
1813         clear_inode(inode);
1814
1815         ni_clear(ntfs_i(inode));
1816 }
1817
1818 /*
1819  * ntfs_translate_junction
1820  *
1821  * Translate a Windows junction target to the Linux equivalent.
1822  * On junctions, targets are always absolute (they include the drive
1823  * letter). We have no way of knowing if the target is for the current
1824  * mounted device or not so we just assume it is.
1825  */
1826 static int ntfs_translate_junction(const struct super_block *sb,
1827                                    const struct dentry *link_de, char *target,
1828                                    int target_len, int target_max)
1829 {
1830         int tl_len, err = target_len;
1831         char *link_path_buffer = NULL, *link_path;
1832         char *translated = NULL;
1833         char *target_start;
1834         int copy_len;
1835
1836         link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1837         if (!link_path_buffer) {
1838                 err = -ENOMEM;
1839                 goto out;
1840         }
1841         /* Get link path, relative to mount point */
1842         link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1843         if (IS_ERR(link_path)) {
1844                 ntfs_err(sb, "Error getting link path");
1845                 err = -EINVAL;
1846                 goto out;
1847         }
1848
1849         translated = kmalloc(PATH_MAX, GFP_NOFS);
1850         if (!translated) {
1851                 err = -ENOMEM;
1852                 goto out;
1853         }
1854
1855         /* Make translated path a relative path to mount point */
1856         strcpy(translated, "./");
1857         ++link_path; /* Skip leading / */
1858         for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1859                 if (*link_path == '/') {
1860                         if (PATH_MAX - tl_len < sizeof("../")) {
1861                                 ntfs_err(sb,
1862                                          "Link path %s has too many components",
1863                                          link_path);
1864                                 err = -EINVAL;
1865                                 goto out;
1866                         }
1867                         strcpy(translated + tl_len, "../");
1868                         tl_len += sizeof("../") - 1;
1869                 }
1870         }
1871
1872         /* Skip drive letter */
1873         target_start = target;
1874         while (*target_start && *target_start != ':')
1875                 ++target_start;
1876
1877         if (!*target_start) {
1878                 ntfs_err(sb, "Link target (%s) missing drive separator",
1879                          target);
1880                 err = -EINVAL;
1881                 goto out;
1882         }
1883
1884         /* Skip drive separator and leading /, if exists */
1885         target_start += 1 + (target_start[1] == '/');
1886         copy_len = target_len - (target_start - target);
1887
1888         if (PATH_MAX - tl_len <= copy_len) {
1889                 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1890                          target_start, PATH_MAX - tl_len, copy_len);
1891                 err = -EINVAL;
1892                 goto out;
1893         }
1894
1895         /* translated path has a trailing / and target_start does not */
1896         strcpy(translated + tl_len, target_start);
1897         tl_len += copy_len;
1898         if (target_max <= tl_len) {
1899                 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1900                          translated, target_max, tl_len);
1901                 err = -EINVAL;
1902                 goto out;
1903         }
1904         strcpy(target, translated);
1905         err = tl_len;
1906
1907 out:
1908         kfree(link_path_buffer);
1909         kfree(translated);
1910         return err;
1911 }
1912
1913 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1914                                       struct inode *inode, char *buffer,
1915                                       int buflen)
1916 {
1917         int i, err = -EINVAL;
1918         struct ntfs_inode *ni = ntfs_i(inode);
1919         struct super_block *sb = inode->i_sb;
1920         struct ntfs_sb_info *sbi = sb->s_fs_info;
1921         u64 size;
1922         u16 ulen = 0;
1923         void *to_free = NULL;
1924         struct REPARSE_DATA_BUFFER *rp;
1925         const __le16 *uname;
1926         struct ATTRIB *attr;
1927
1928         /* Reparse data present. Try to parse it. */
1929         static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1930         static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1931
1932         *buffer = 0;
1933
1934         attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1935         if (!attr)
1936                 goto out;
1937
1938         if (!attr->non_res) {
1939                 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1940                 if (!rp)
1941                         goto out;
1942                 size = le32_to_cpu(attr->res.data_size);
1943         } else {
1944                 size = le64_to_cpu(attr->nres.data_size);
1945                 rp = NULL;
1946         }
1947
1948         if (size > sbi->reparse.max_size || size <= sizeof(u32))
1949                 goto out;
1950
1951         if (!rp) {
1952                 rp = kmalloc(size, GFP_NOFS);
1953                 if (!rp) {
1954                         err = -ENOMEM;
1955                         goto out;
1956                 }
1957                 to_free = rp;
1958                 /* Read into temporal buffer. */
1959                 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1960                 if (err)
1961                         goto out;
1962         }
1963
1964         /* Microsoft Tag. */
1965         switch (rp->ReparseTag) {
1966         case IO_REPARSE_TAG_MOUNT_POINT:
1967                 /* Mount points and junctions. */
1968                 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1969                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1970                                      MountPointReparseBuffer.PathBuffer))
1971                         goto out;
1972                 uname = Add2Ptr(rp,
1973                                 offsetof(struct REPARSE_DATA_BUFFER,
1974                                          MountPointReparseBuffer.PathBuffer) +
1975                                         le16_to_cpu(rp->MountPointReparseBuffer
1976                                                             .PrintNameOffset));
1977                 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1978                 break;
1979
1980         case IO_REPARSE_TAG_SYMLINK:
1981                 /* FolderSymbolicLink */
1982                 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1983                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1984                                      SymbolicLinkReparseBuffer.PathBuffer))
1985                         goto out;
1986                 uname = Add2Ptr(
1987                         rp, offsetof(struct REPARSE_DATA_BUFFER,
1988                                      SymbolicLinkReparseBuffer.PathBuffer) +
1989                                     le16_to_cpu(rp->SymbolicLinkReparseBuffer
1990                                                         .PrintNameOffset));
1991                 ulen = le16_to_cpu(
1992                         rp->SymbolicLinkReparseBuffer.PrintNameLength);
1993                 break;
1994
1995         case IO_REPARSE_TAG_CLOUD:
1996         case IO_REPARSE_TAG_CLOUD_1:
1997         case IO_REPARSE_TAG_CLOUD_2:
1998         case IO_REPARSE_TAG_CLOUD_3:
1999         case IO_REPARSE_TAG_CLOUD_4:
2000         case IO_REPARSE_TAG_CLOUD_5:
2001         case IO_REPARSE_TAG_CLOUD_6:
2002         case IO_REPARSE_TAG_CLOUD_7:
2003         case IO_REPARSE_TAG_CLOUD_8:
2004         case IO_REPARSE_TAG_CLOUD_9:
2005         case IO_REPARSE_TAG_CLOUD_A:
2006         case IO_REPARSE_TAG_CLOUD_B:
2007         case IO_REPARSE_TAG_CLOUD_C:
2008         case IO_REPARSE_TAG_CLOUD_D:
2009         case IO_REPARSE_TAG_CLOUD_E:
2010         case IO_REPARSE_TAG_CLOUD_F:
2011                 err = sizeof("OneDrive") - 1;
2012                 if (err > buflen)
2013                         err = buflen;
2014                 memcpy(buffer, "OneDrive", err);
2015                 goto out;
2016
2017         default:
2018                 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2019                         /* Unknown Microsoft Tag. */
2020                         goto out;
2021                 }
2022                 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2023                     size <= sizeof(struct REPARSE_POINT)) {
2024                         goto out;
2025                 }
2026
2027                 /* Users tag. */
2028                 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2029                 ulen = le16_to_cpu(rp->ReparseDataLength) -
2030                        sizeof(struct REPARSE_POINT);
2031         }
2032
2033         /* Convert nlen from bytes to UNICODE chars. */
2034         ulen >>= 1;
2035
2036         /* Check that name is available. */
2037         if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2038                 goto out;
2039
2040         /* If name is already zero terminated then truncate it now. */
2041         if (!uname[ulen - 1])
2042                 ulen -= 1;
2043
2044         err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2045
2046         if (err < 0)
2047                 goto out;
2048
2049         /* Translate Windows '\' into Linux '/'. */
2050         for (i = 0; i < err; i++) {
2051                 if (buffer[i] == '\\')
2052                         buffer[i] = '/';
2053         }
2054
2055         /* Always set last zero. */
2056         buffer[err] = 0;
2057
2058         /* If this is a junction, translate the link target. */
2059         if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2060                 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2061
2062 out:
2063         kfree(to_free);
2064         return err;
2065 }
2066
2067 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2068                                  struct delayed_call *done)
2069 {
2070         int err;
2071         char *ret;
2072
2073         if (!de)
2074                 return ERR_PTR(-ECHILD);
2075
2076         ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2077         if (!ret)
2078                 return ERR_PTR(-ENOMEM);
2079
2080         err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2081         if (err < 0) {
2082                 kfree(ret);
2083                 return ERR_PTR(err);
2084         }
2085
2086         set_delayed_call(done, kfree_link, ret);
2087
2088         return ret;
2089 }
2090
2091 // clang-format off
2092 const struct inode_operations ntfs_link_inode_operations = {
2093         .get_link       = ntfs_get_link,
2094         .setattr        = ntfs3_setattr,
2095         .listxattr      = ntfs_listxattr,
2096 };
2097
2098 const struct address_space_operations ntfs_aops = {
2099         .read_folio     = ntfs_read_folio,
2100         .readahead      = ntfs_readahead,
2101         .writepages     = ntfs_writepages,
2102         .write_begin    = ntfs_write_begin,
2103         .write_end      = ntfs_write_end,
2104         .direct_IO      = ntfs_direct_IO,
2105         .bmap           = ntfs_bmap,
2106         .dirty_folio    = block_dirty_folio,
2107         .migrate_folio  = buffer_migrate_folio,
2108         .invalidate_folio = block_invalidate_folio,
2109 };
2110
2111 const struct address_space_operations ntfs_aops_cmpr = {
2112         .read_folio     = ntfs_read_folio,
2113         .readahead      = ntfs_readahead,
2114 };
2115 // clang-format on