fs/ntfs3/inode.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *
   4  * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
   5  *
   6  */
   7
   8 #include <linux/buffer_head.h>
   9 #include <linux/fs.h>
  10 #include <linux/mpage.h>
  11 #include <linux/namei.h>
  12 #include <linux/nls.h>
  13 #include <linux/uio.h>
  14 #include <linux/writeback.h>
  15
  16 #include "debug.h"
  17 #include "ntfs.h"
  18 #include "ntfs_fs.h"
  19
  20 /*
  21  * ntfs_read_mft - Read record and parses MFT.
  22  */
  23 static struct inode *ntfs_read_mft(struct inode *inode,
  24                                    const struct cpu_str *name,
  25                                    const struct MFT_REF *ref)
  26 {
  27         int err = 0;
  28         struct ntfs_inode *ni = ntfs_i(inode);
  29         struct super_block *sb = inode->i_sb;
  30         struct ntfs_sb_info *sbi = sb->s_fs_info;
  31         mode_t mode = 0;
  32         struct ATTR_STD_INFO5 *std5 = NULL;
  33         struct ATTR_LIST_ENTRY *le;
  34         struct ATTRIB *attr;
  35         bool is_match = false;
  36         bool is_root = false;
  37         bool is_dir;
  38         unsigned long ino = inode->i_ino;
  39         u32 rp_fa = 0, asize, t32;
  40         u16 roff, rsize, names = 0;
  41         const struct ATTR_FILE_NAME *fname = NULL;
  42         const struct INDEX_ROOT *root;
  43         struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
  44         u64 t64;
  45         struct MFT_REC *rec;
  46         struct runs_tree *run;
  47
  48         inode->i_op = NULL;
  49         /* Setup 'uid' and 'gid' */
  50         inode->i_uid = sbi->options->fs_uid;
  51         inode->i_gid = sbi->options->fs_gid;
  52
  53         err = mi_init(&ni->mi, sbi, ino);
  54         if (err)
  55                 goto out;
  56
  57         if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
  58                 t64 = sbi->mft.lbo >> sbi->cluster_bits;
  59                 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
  60                 sbi->mft.ni = ni;
  61                 init_rwsem(&ni->file.run_lock);
  62
  63                 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
  64                         err = -ENOMEM;
  65                         goto out;
  66                 }
  67         }
  68
  69         err = mi_read(&ni->mi, ino == MFT_REC_MFT);
  70
  71         if (err)
  72                 goto out;
  73
  74         rec = ni->mi.mrec;
  75
  76         if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
  77                 ;
  78         } else if (ref->seq != rec->seq) {
  79                 err = -EINVAL;
  80                 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
  81                          le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
  82                 goto out;
  83         } else if (!is_rec_inuse(rec)) {
  84                 err = -EINVAL;
  85                 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
  86                 goto out;
  87         }
  88
  89         if (le32_to_cpu(rec->total) != sbi->record_size) {
  90                 /* Bad inode? */
  91                 err = -EINVAL;
  92                 goto out;
  93         }
  94
  95         if (!is_rec_base(rec))
  96                 goto Ok;
  97
  98         /* Record should contain $I30 root. */
  99         is_dir = rec->flags & RECORD_FLAG_DIR;
 100
 101         inode->i_generation = le16_to_cpu(rec->seq);
 102
 103         /* Enumerate all struct Attributes MFT. */
 104         le = NULL;
 105         attr = NULL;
 106
 107         /*
 108          * To reduce tab pressure use goto instead of
 109          * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
 110          */
 111 next_attr:
 112         run = NULL;
 113         err = -EINVAL;
 114         attr = ni_enum_attr_ex(ni, attr, &le, NULL);
 115         if (!attr)
 116                 goto end_enum;
 117
 118         if (le && le->vcn) {
 119                 /* This is non primary attribute segment. Ignore if not MFT. */
 120                 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
 121                         goto next_attr;
 122
 123                 run = &ni->file.run;
 124                 asize = le32_to_cpu(attr->size);
 125                 goto attr_unpack_run;
 126         }
 127
 128         roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
 129         rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
 130         asize = le32_to_cpu(attr->size);
 131
 132         switch (attr->type) {
 133         case ATTR_STD:
 134                 if (attr->non_res ||
 135                     asize < sizeof(struct ATTR_STD_INFO) + roff ||
 136                     rsize < sizeof(struct ATTR_STD_INFO))
 137                         goto out;
 138
 139                 if (std5)
 140                         goto next_attr;
 141
 142                 std5 = Add2Ptr(attr, roff);
 143
 144 #ifdef STATX_BTIME
 145                 nt2kernel(std5->cr_time, &ni->i_crtime);
 146 #endif
 147                 nt2kernel(std5->a_time, &inode->i_atime);
 148                 nt2kernel(std5->c_time, &inode->i_ctime);
 149                 nt2kernel(std5->m_time, &inode->i_mtime);
 150
 151                 ni->std_fa = std5->fa;
 152
 153                 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
 154                     rsize >= sizeof(struct ATTR_STD_INFO5))
 155                         ni->std_security_id = std5->security_id;
 156                 goto next_attr;
 157
 158         case ATTR_LIST:
 159                 if (attr->name_len || le || ino == MFT_REC_LOG)
 160                         goto out;
 161
 162                 err = ntfs_load_attr_list(ni, attr);
 163                 if (err)
 164                         goto out;
 165
 166                 le = NULL;
 167                 attr = NULL;
 168                 goto next_attr;
 169
 170         case ATTR_NAME:
 171                 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
 172                     rsize < SIZEOF_ATTRIBUTE_FILENAME)
 173                         goto out;
 174
 175                 fname = Add2Ptr(attr, roff);
 176                 if (fname->type == FILE_NAME_DOS)
 177                         goto next_attr;
 178
 179                 names += 1;
 180                 if (name && name->len == fname->name_len &&
 181                     !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
 182                                         NULL, false))
 183                         is_match = true;
 184
 185                 goto next_attr;
 186
 187         case ATTR_DATA:
 188                 if (is_dir) {
 189                         /* Ignore data attribute in dir record. */
 190                         goto next_attr;
 191                 }
 192
 193                 if (ino == MFT_REC_BADCLUST && !attr->non_res)
 194                         goto next_attr;
 195
 196                 if (attr->name_len &&
 197                     ((ino != MFT_REC_BADCLUST || !attr->non_res ||
 198                       attr->name_len != ARRAY_SIZE(BAD_NAME) ||
 199                       memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
 200                      (ino != MFT_REC_SECURE || !attr->non_res ||
 201                       attr->name_len != ARRAY_SIZE(SDS_NAME) ||
 202                       memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
 203                         /* File contains stream attribute. Ignore it. */
 204                         goto next_attr;
 205                 }
 206
 207                 if (is_attr_sparsed(attr))
 208                         ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
 209                 else
 210                         ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
 211
 212                 if (is_attr_compressed(attr))
 213                         ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
 214                 else
 215                         ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
 216
 217                 if (is_attr_encrypted(attr))
 218                         ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
 219                 else
 220                         ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
 221
 222                 if (!attr->non_res) {
 223                         ni->i_valid = inode->i_size = rsize;
 224                         inode_set_bytes(inode, rsize);
 225                 }
 226
 227                 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
 228
 229                 if (!attr->non_res) {
 230                         ni->ni_flags |= NI_FLAG_RESIDENT;
 231                         goto next_attr;
 232                 }
 233
 234                 inode_set_bytes(inode, attr_ondisk_size(attr));
 235
 236                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 237                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 238                 if (!attr->nres.alloc_size)
 239                         goto next_attr;
 240
 241                 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run
 242                                             : &ni->file.run;
 243                 break;
 244
 245         case ATTR_ROOT:
 246                 if (attr->non_res)
 247                         goto out;
 248
 249                 root = Add2Ptr(attr, roff);
 250                 is_root = true;
 251
 252                 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
 253                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 254                         goto next_attr;
 255
 256                 if (root->type != ATTR_NAME ||
 257                     root->rule != NTFS_COLLATION_TYPE_FILENAME)
 258                         goto out;
 259
 260                 if (!is_dir)
 261                         goto next_attr;
 262
 263                 ni->ni_flags |= NI_FLAG_DIR;
 264
 265                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
 266                 if (err)
 267                         goto out;
 268
 269                 mode = sb->s_root
 270                                ? (S_IFDIR | (0777 & sbi->options->fs_dmask_inv))
 271                                : (S_IFDIR | 0777);
 272                 goto next_attr;
 273
 274         case ATTR_ALLOC:
 275                 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
 276                     memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 277                         goto next_attr;
 278
 279                 inode->i_size = le64_to_cpu(attr->nres.data_size);
 280                 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 281                 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
 282
 283                 run = &ni->dir.alloc_run;
 284                 break;
 285
 286         case ATTR_BITMAP:
 287                 if (ino == MFT_REC_MFT) {
 288                         if (!attr->non_res)
 289                                 goto out;
 290 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
 291                         /* 0x20000000 = 2^32 / 8 */
 292                         if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
 293                                 goto out;
 294 #endif
 295                         run = &sbi->mft.bitmap.run;
 296                         break;
 297                 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
 298                            !memcmp(attr_name(attr), I30_NAME,
 299                                    sizeof(I30_NAME)) &&
 300                            attr->non_res) {
 301                         run = &ni->dir.bitmap_run;
 302                         break;
 303                 }
 304                 goto next_attr;
 305
 306         case ATTR_REPARSE:
 307                 if (attr->name_len)
 308                         goto next_attr;
 309
 310                 rp_fa = ni_parse_reparse(ni, attr, &rp);
 311                 switch (rp_fa) {
 312                 case REPARSE_LINK:
 313                         /*
 314                          * Normal symlink.
 315                          * Assume one unicode symbol == one utf8.
 316                          */
 317                         inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
 318                                                             .PrintNameLength) /
 319                                         sizeof(u16);
 320
 321                         ni->i_valid = inode->i_size;
 322
 323                         /* Clear directory bit. */
 324                         if (ni->ni_flags & NI_FLAG_DIR) {
 325                                 indx_clear(&ni->dir);
 326                                 memset(&ni->dir, 0, sizeof(ni->dir));
 327                                 ni->ni_flags &= ~NI_FLAG_DIR;
 328                         } else {
 329                                 run_close(&ni->file.run);
 330                         }
 331                         mode = S_IFLNK | 0777;
 332                         is_dir = false;
 333                         if (attr->non_res) {
 334                                 run = &ni->file.run;
 335                                 goto attr_unpack_run; // Double break.
 336                         }
 337                         break;
 338
 339                 case REPARSE_COMPRESSED:
 340                         break;
 341
 342                 case REPARSE_DEDUPLICATED:
 343                         break;
 344                 }
 345                 goto next_attr;
 346
 347         case ATTR_EA_INFO:
 348                 if (!attr->name_len &&
 349                     resident_data_ex(attr, sizeof(struct EA_INFO))) {
 350                         ni->ni_flags |= NI_FLAG_EA;
 351                         /*
 352                          * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
 353                          */
 354                         inode->i_mode = mode;
 355                         ntfs_get_wsl_perm(inode);
 356                         mode = inode->i_mode;
 357                 }
 358                 goto next_attr;
 359
 360         default:
 361                 goto next_attr;
 362         }
 363
 364 attr_unpack_run:
 365         roff = le16_to_cpu(attr->nres.run_off);
 366
 367         if (roff > asize) {
 368                 err = -EINVAL;
 369                 goto out;
 370         }
 371
 372         t64 = le64_to_cpu(attr->nres.svcn);
 373         err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
 374                             t64, Add2Ptr(attr, roff), asize - roff);
 375         if (err < 0)
 376                 goto out;
 377         err = 0;
 378         goto next_attr;
 379
 380 end_enum:
 381
 382         if (!std5)
 383                 goto out;
 384
 385         if (!is_match && name) {
 386                 /* Reuse rec as buffer for ascii name. */
 387                 err = -ENOENT;
 388                 goto out;
 389         }
 390
 391         if (std5->fa & FILE_ATTRIBUTE_READONLY)
 392                 mode &= ~0222;
 393
 394         if (!names) {
 395                 err = -EINVAL;
 396                 goto out;
 397         }
 398
 399         if (names != le16_to_cpu(rec->hard_links)) {
 400                 /* Correct minor error on the fly. Do not mark inode as dirty. */
 401                 rec->hard_links = cpu_to_le16(names);
 402                 ni->mi.dirty = true;
 403         }
 404
 405         set_nlink(inode, names);
 406
 407         if (S_ISDIR(mode)) {
 408                 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
 409
 410                 /*
 411                  * Dot and dot-dot should be included in count but was not
 412                  * included in enumeration.
 413                  * Usually a hard links to directories are disabled.
 414                  */
 415                 inode->i_op = &ntfs_dir_inode_operations;
 416                 inode->i_fop = &ntfs_dir_operations;
 417                 ni->i_valid = 0;
 418         } else if (S_ISLNK(mode)) {
 419                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 420                 inode->i_op = &ntfs_link_inode_operations;
 421                 inode->i_fop = NULL;
 422                 inode_nohighmem(inode);
 423         } else if (S_ISREG(mode)) {
 424                 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 425                 inode->i_op = &ntfs_file_inode_operations;
 426                 inode->i_fop = &ntfs_file_operations;
 427                 inode->i_mapping->a_ops =
 428                         is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
 429                 if (ino != MFT_REC_MFT)
 430                         init_rwsem(&ni->file.run_lock);
 431         } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
 432                    S_ISSOCK(mode)) {
 433                 inode->i_op = &ntfs_special_inode_operations;
 434                 init_special_inode(inode, mode, inode->i_rdev);
 435         } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
 436                    fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
 437                 /* Records in $Extend are not a files or general directories. */
 438                 inode->i_op = &ntfs_file_inode_operations;
 439         } else {
 440                 err = -EINVAL;
 441                 goto out;
 442         }
 443
 444         if ((sbi->options->sys_immutable &&
 445              (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
 446             !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
 447                 inode->i_flags |= S_IMMUTABLE;
 448         } else {
 449                 inode->i_flags &= ~S_IMMUTABLE;
 450         }
 451
 452         inode->i_mode = mode;
 453         if (!(ni->ni_flags & NI_FLAG_EA)) {
 454                 /* If no xattr then no security (stored in xattr). */
 455                 inode->i_flags |= S_NOSEC;
 456         }
 457
 458 Ok:
 459         if (ino == MFT_REC_MFT && !sb->s_root)
 460                 sbi->mft.ni = NULL;
 461
 462         unlock_new_inode(inode);
 463
 464         return inode;
 465
 466 out:
 467         if (ino == MFT_REC_MFT && !sb->s_root)
 468                 sbi->mft.ni = NULL;
 469
 470         iget_failed(inode);
 471         return ERR_PTR(err);
 472 }
 473
 474 /*
 475  * ntfs_test_inode
 476  *
 477  * Return: 1 if match.
 478  */
 479 static int ntfs_test_inode(struct inode *inode, void *data)
 480 {
 481         struct MFT_REF *ref = data;
 482
 483         return ino_get(ref) == inode->i_ino;
 484 }
 485
 486 static int ntfs_set_inode(struct inode *inode, void *data)
 487 {
 488         const struct MFT_REF *ref = data;
 489
 490         inode->i_ino = ino_get(ref);
 491         return 0;
 492 }
 493
 494 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
 495                          const struct cpu_str *name)
 496 {
 497         struct inode *inode;
 498
 499         inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
 500                              (void *)ref);
 501         if (unlikely(!inode))
 502                 return ERR_PTR(-ENOMEM);
 503
 504         /* If this is a freshly allocated inode, need to read it now. */
 505         if (inode->i_state & I_NEW)
 506                 inode = ntfs_read_mft(inode, name, ref);
 507         else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
 508                 /* Inode overlaps? */
 509                 make_bad_inode(inode);
 510         }
 511
 512         return inode;
 513 }
 514
 515 enum get_block_ctx {
 516         GET_BLOCK_GENERAL = 0,
 517         GET_BLOCK_WRITE_BEGIN = 1,
 518         GET_BLOCK_DIRECT_IO_R = 2,
 519         GET_BLOCK_DIRECT_IO_W = 3,
 520         GET_BLOCK_BMAP = 4,
 521 };
 522
 523 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
 524                                        struct buffer_head *bh, int create,
 525                                        enum get_block_ctx ctx)
 526 {
 527         struct super_block *sb = inode->i_sb;
 528         struct ntfs_sb_info *sbi = sb->s_fs_info;
 529         struct ntfs_inode *ni = ntfs_i(inode);
 530         struct page *page = bh->b_page;
 531         u8 cluster_bits = sbi->cluster_bits;
 532         u32 block_size = sb->s_blocksize;
 533         u64 bytes, lbo, valid;
 534         u32 off;
 535         int err;
 536         CLST vcn, lcn, len;
 537         bool new;
 538
 539         /* Clear previous state. */
 540         clear_buffer_new(bh);
 541         clear_buffer_uptodate(bh);
 542
 543         /* Direct write uses 'create=0'. */
 544         if (!create && vbo >= ni->i_valid) {
 545                 /* Out of valid. */
 546                 return 0;
 547         }
 548
 549         if (vbo >= inode->i_size) {
 550                 /* Out of size. */
 551                 return 0;
 552         }
 553
 554         if (is_resident(ni)) {
 555                 ni_lock(ni);
 556                 err = attr_data_read_resident(ni, page);
 557                 ni_unlock(ni);
 558
 559                 if (!err)
 560                         set_buffer_uptodate(bh);
 561                 bh->b_size = block_size;
 562                 return err;
 563         }
 564
 565         vcn = vbo >> cluster_bits;
 566         off = vbo & sbi->cluster_mask;
 567         new = false;
 568
 569         err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL);
 570         if (err)
 571                 goto out;
 572
 573         if (!len)
 574                 return 0;
 575
 576         bytes = ((u64)len << cluster_bits) - off;
 577
 578         if (lcn == SPARSE_LCN) {
 579                 if (!create) {
 580                         if (bh->b_size > bytes)
 581                                 bh->b_size = bytes;
 582                         return 0;
 583                 }
 584                 WARN_ON(1);
 585         }
 586
 587         if (new) {
 588                 set_buffer_new(bh);
 589                 if ((len << cluster_bits) > block_size)
 590                         ntfs_sparse_cluster(inode, page, vcn, len);
 591         }
 592
 593         lbo = ((u64)lcn << cluster_bits) + off;
 594
 595         set_buffer_mapped(bh);
 596         bh->b_bdev = sb->s_bdev;
 597         bh->b_blocknr = lbo >> sb->s_blocksize_bits;
 598
 599         valid = ni->i_valid;
 600
 601         if (ctx == GET_BLOCK_DIRECT_IO_W) {
 602                 /* ntfs_direct_IO will update ni->i_valid. */
 603                 if (vbo >= valid)
 604                         set_buffer_new(bh);
 605         } else if (create) {
 606                 /* Normal write. */
 607                 if (bytes > bh->b_size)
 608                         bytes = bh->b_size;
 609
 610                 if (vbo >= valid)
 611                         set_buffer_new(bh);
 612
 613                 if (vbo + bytes > valid) {
 614                         ni->i_valid = vbo + bytes;
 615                         mark_inode_dirty(inode);
 616                 }
 617         } else if (vbo >= valid) {
 618                 /* Read out of valid data. */
 619                 /* Should never be here 'cause already checked. */
 620                 clear_buffer_mapped(bh);
 621         } else if (vbo + bytes <= valid) {
 622                 /* Normal read. */
 623         } else if (vbo + block_size <= valid) {
 624                 /* Normal short read. */
 625                 bytes = block_size;
 626         } else {
 627                 /*
 628                  * Read across valid size: vbo < valid && valid < vbo + block_size
 629                  */
 630                 bytes = block_size;
 631
 632                 if (page) {
 633                         u32 voff = valid - vbo;
 634
 635                         bh->b_size = block_size;
 636                         off = vbo & (PAGE_SIZE - 1);
 637                         set_bh_page(bh, page, off);
 638                         ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 639                         wait_on_buffer(bh);
 640                         if (!buffer_uptodate(bh)) {
 641                                 err = -EIO;
 642                                 goto out;
 643                         }
 644                         zero_user_segment(page, off + voff, off + block_size);
 645                 }
 646         }
 647
 648         if (bh->b_size > bytes)
 649                 bh->b_size = bytes;
 650
 651 #ifndef __LP64__
 652         if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
 653                 static_assert(sizeof(size_t) < sizeof(loff_t));
 654                 if (bytes > 0x40000000u)
 655                         bh->b_size = 0x40000000u;
 656         }
 657 #endif
 658
 659         return 0;
 660
 661 out:
 662         return err;
 663 }
 664
 665 int ntfs_get_block(struct inode *inode, sector_t vbn,
 666                    struct buffer_head *bh_result, int create)
 667 {
 668         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 669                                   bh_result, create, GET_BLOCK_GENERAL);
 670 }
 671
 672 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
 673                                struct buffer_head *bh_result, int create)
 674 {
 675         return ntfs_get_block_vbo(inode,
 676                                   (u64)vsn << inode->i_sb->s_blocksize_bits,
 677                                   bh_result, create, GET_BLOCK_BMAP);
 678 }
 679
 680 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
 681 {
 682         return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
 683 }
 684
 685 static int ntfs_readpage(struct file *file, struct page *page)
 686 {
 687         int err;
 688         struct address_space *mapping = page->mapping;
 689         struct inode *inode = mapping->host;
 690         struct ntfs_inode *ni = ntfs_i(inode);
 691
 692         if (is_resident(ni)) {
 693                 ni_lock(ni);
 694                 err = attr_data_read_resident(ni, page);
 695                 ni_unlock(ni);
 696                 if (err != E_NTFS_NONRESIDENT) {
 697                         unlock_page(page);
 698                         return err;
 699                 }
 700         }
 701
 702         if (is_compressed(ni)) {
 703                 ni_lock(ni);
 704                 err = ni_readpage_cmpr(ni, page);
 705                 ni_unlock(ni);
 706                 return err;
 707         }
 708
 709         /* Normal + sparse files. */
 710         return mpage_readpage(page, ntfs_get_block);
 711 }
 712
 713 static void ntfs_readahead(struct readahead_control *rac)
 714 {
 715         struct address_space *mapping = rac->mapping;
 716         struct inode *inode = mapping->host;
 717         struct ntfs_inode *ni = ntfs_i(inode);
 718         u64 valid;
 719         loff_t pos;
 720
 721         if (is_resident(ni)) {
 722                 /* No readahead for resident. */
 723                 return;
 724         }
 725
 726         if (is_compressed(ni)) {
 727                 /* No readahead for compressed. */
 728                 return;
 729         }
 730
 731         valid = ni->i_valid;
 732         pos = readahead_pos(rac);
 733
 734         if (valid < i_size_read(inode) && pos <= valid &&
 735             valid < pos + readahead_length(rac)) {
 736                 /* Range cross 'valid'. Read it page by page. */
 737                 return;
 738         }
 739
 740         mpage_readahead(rac, ntfs_get_block);
 741 }
 742
 743 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
 744                                       struct buffer_head *bh_result, int create)
 745 {
 746         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 747                                   bh_result, create, GET_BLOCK_DIRECT_IO_R);
 748 }
 749
 750 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
 751                                       struct buffer_head *bh_result, int create)
 752 {
 753         return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 754                                   bh_result, create, GET_BLOCK_DIRECT_IO_W);
 755 }
 756
 757 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 758 {
 759         struct file *file = iocb->ki_filp;
 760         struct address_space *mapping = file->f_mapping;
 761         struct inode *inode = mapping->host;
 762         struct ntfs_inode *ni = ntfs_i(inode);
 763         loff_t vbo = iocb->ki_pos;
 764         loff_t end;
 765         int wr = iov_iter_rw(iter) & WRITE;
 766         size_t iter_count = iov_iter_count(iter);
 767         loff_t valid;
 768         ssize_t ret;
 769
 770         if (is_resident(ni)) {
 771                 /* Switch to buffered write. */
 772                 ret = 0;
 773                 goto out;
 774         }
 775
 776         ret = blockdev_direct_IO(iocb, inode, iter,
 777                                  wr ? ntfs_get_block_direct_IO_W
 778                                     : ntfs_get_block_direct_IO_R);
 779
 780         if (ret > 0)
 781                 end = vbo + ret;
 782         else if (wr && ret == -EIOCBQUEUED)
 783                 end = vbo + iter_count;
 784         else
 785                 goto out;
 786
 787         valid = ni->i_valid;
 788         if (wr) {
 789                 if (end > valid && !S_ISBLK(inode->i_mode)) {
 790                         ni->i_valid = end;
 791                         mark_inode_dirty(inode);
 792                 }
 793         } else if (vbo < valid && valid < end) {
 794                 /* Fix page. */
 795                 iov_iter_revert(iter, end - valid);
 796                 iov_iter_zero(end - valid, iter);
 797         }
 798
 799 out:
 800         return ret;
 801 }
 802
 803 int ntfs_set_size(struct inode *inode, u64 new_size)
 804 {
 805         struct super_block *sb = inode->i_sb;
 806         struct ntfs_sb_info *sbi = sb->s_fs_info;
 807         struct ntfs_inode *ni = ntfs_i(inode);
 808         int err;
 809
 810         /* Check for maximum file size. */
 811         if (is_sparsed(ni) || is_compressed(ni)) {
 812                 if (new_size > sbi->maxbytes_sparse) {
 813                         err = -EFBIG;
 814                         goto out;
 815                 }
 816         } else if (new_size > sbi->maxbytes) {
 817                 err = -EFBIG;
 818                 goto out;
 819         }
 820
 821         ni_lock(ni);
 822         down_write(&ni->file.run_lock);
 823
 824         err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 825                             &ni->i_valid, true, NULL);
 826
 827         up_write(&ni->file.run_lock);
 828         ni_unlock(ni);
 829
 830         mark_inode_dirty(inode);
 831
 832 out:
 833         return err;
 834 }
 835
 836 static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
 837 {
 838         struct address_space *mapping = page->mapping;
 839         struct inode *inode = mapping->host;
 840         struct ntfs_inode *ni = ntfs_i(inode);
 841         int err;
 842
 843         if (is_resident(ni)) {
 844                 ni_lock(ni);
 845                 err = attr_data_write_resident(ni, page);
 846                 ni_unlock(ni);
 847                 if (err != E_NTFS_NONRESIDENT) {
 848                         unlock_page(page);
 849                         return err;
 850                 }
 851         }
 852
 853         return block_write_full_page(page, ntfs_get_block, wbc);
 854 }
 855
 856 static int ntfs_writepages(struct address_space *mapping,
 857                            struct writeback_control *wbc)
 858 {
 859         struct inode *inode = mapping->host;
 860         struct ntfs_inode *ni = ntfs_i(inode);
 861         /* Redirect call to 'ntfs_writepage' for resident files. */
 862         get_block_t *get_block = is_resident(ni) ? NULL : &ntfs_get_block;
 863
 864         return mpage_writepages(mapping, wbc, get_block);
 865 }
 866
 867 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
 868                                       struct buffer_head *bh_result, int create)
 869 {
 870         return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 871                                   bh_result, create, GET_BLOCK_WRITE_BEGIN);
 872 }
 873
 874 static int ntfs_write_begin(struct file *file, struct address_space *mapping,
 875                             loff_t pos, u32 len, u32 flags, struct page **pagep,
 876                             void **fsdata)
 877 {
 878         int err;
 879         struct inode *inode = mapping->host;
 880         struct ntfs_inode *ni = ntfs_i(inode);
 881
 882         *pagep = NULL;
 883         if (is_resident(ni)) {
 884                 struct page *page = grab_cache_page_write_begin(
 885                         mapping, pos >> PAGE_SHIFT, flags);
 886
 887                 if (!page) {
 888                         err = -ENOMEM;
 889                         goto out;
 890                 }
 891
 892                 ni_lock(ni);
 893                 err = attr_data_read_resident(ni, page);
 894                 ni_unlock(ni);
 895
 896                 if (!err) {
 897                         *pagep = page;
 898                         goto out;
 899                 }
 900                 unlock_page(page);
 901                 put_page(page);
 902
 903                 if (err != E_NTFS_NONRESIDENT)
 904                         goto out;
 905         }
 906
 907         err = block_write_begin(mapping, pos, len, flags, pagep,
 908                                 ntfs_get_block_write_begin);
 909
 910 out:
 911         return err;
 912 }
 913
 914 /*
 915  * ntfs_write_end - Address_space_operations::write_end.
 916  */
 917 static int ntfs_write_end(struct file *file, struct address_space *mapping,
 918                           loff_t pos, u32 len, u32 copied, struct page *page,
 919                           void *fsdata)
 920
 921 {
 922         struct inode *inode = mapping->host;
 923         struct ntfs_inode *ni = ntfs_i(inode);
 924         u64 valid = ni->i_valid;
 925         bool dirty = false;
 926         int err;
 927
 928         if (is_resident(ni)) {
 929                 ni_lock(ni);
 930                 err = attr_data_write_resident(ni, page);
 931                 ni_unlock(ni);
 932                 if (!err) {
 933                         dirty = true;
 934                         /* Clear any buffers in page. */
 935                         if (page_has_buffers(page)) {
 936                                 struct buffer_head *head, *bh;
 937
 938                                 bh = head = page_buffers(page);
 939                                 do {
 940                                         clear_buffer_dirty(bh);
 941                                         clear_buffer_mapped(bh);
 942                                         set_buffer_uptodate(bh);
 943                                 } while (head != (bh = bh->b_this_page));
 944                         }
 945                         SetPageUptodate(page);
 946                         err = copied;
 947                 }
 948                 unlock_page(page);
 949                 put_page(page);
 950         } else {
 951                 err = generic_write_end(file, mapping, pos, len, copied, page,
 952                                         fsdata);
 953         }
 954
 955         if (err >= 0) {
 956                 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
 957                         inode->i_ctime = inode->i_mtime = current_time(inode);
 958                         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 959                         dirty = true;
 960                 }
 961
 962                 if (valid != ni->i_valid) {
 963                         /* ni->i_valid is changed in ntfs_get_block_vbo. */
 964                         dirty = true;
 965                 }
 966
 967                 if (dirty)
 968                         mark_inode_dirty(inode);
 969         }
 970
 971         return err;
 972 }
 973
 974 int reset_log_file(struct inode *inode)
 975 {
 976         int err;
 977         loff_t pos = 0;
 978         u32 log_size = inode->i_size;
 979         struct address_space *mapping = inode->i_mapping;
 980
 981         for (;;) {
 982                 u32 len;
 983                 void *kaddr;
 984                 struct page *page;
 985
 986                 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
 987
 988                 err = block_write_begin(mapping, pos, len, 0, &page,
 989                                         ntfs_get_block_write_begin);
 990                 if (err)
 991                         goto out;
 992
 993                 kaddr = kmap_atomic(page);
 994                 memset(kaddr, -1, len);
 995                 kunmap_atomic(kaddr);
 996                 flush_dcache_page(page);
 997
 998                 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
 999                 if (err < 0)
1000                         goto out;
1001                 pos += len;
1002
1003                 if (pos >= log_size)
1004                         break;
1005                 balance_dirty_pages_ratelimited(mapping);
1006         }
1007 out:
1008         mark_inode_dirty_sync(inode);
1009
1010         return err;
1011 }
1012
1013 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1014 {
1015         return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1016 }
1017
1018 int ntfs_sync_inode(struct inode *inode)
1019 {
1020         return _ni_write_inode(inode, 1);
1021 }
1022
1023 /*
1024  * writeback_inode - Helper function for ntfs_flush_inodes().
1025  *
1026  * This writes both the inode and the file data blocks, waiting
1027  * for in flight data blocks before the start of the call.  It
1028  * does not wait for any io started during the call.
1029  */
1030 static int writeback_inode(struct inode *inode)
1031 {
1032         int ret = sync_inode_metadata(inode, 0);
1033
1034         if (!ret)
1035                 ret = filemap_fdatawrite(inode->i_mapping);
1036         return ret;
1037 }
1038
1039 /*
1040  * ntfs_flush_inodes
1041  *
1042  * Write data and metadata corresponding to i1 and i2.  The io is
1043  * started but we do not wait for any of it to finish.
1044  *
1045  * filemap_flush() is used for the block device, so if there is a dirty
1046  * page for a block already in flight, we will not wait and start the
1047  * io over again.
1048  */
1049 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1050                       struct inode *i2)
1051 {
1052         int ret = 0;
1053
1054         if (i1)
1055                 ret = writeback_inode(i1);
1056         if (!ret && i2)
1057                 ret = writeback_inode(i2);
1058         if (!ret)
1059                 ret = filemap_flush(sb->s_bdev->bd_inode->i_mapping);
1060         return ret;
1061 }
1062
1063 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1064 {
1065         pgoff_t idx;
1066
1067         /* Write non resident data. */
1068         for (idx = 0; bytes; idx++) {
1069                 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1070                 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1071
1072                 if (IS_ERR(page))
1073                         return PTR_ERR(page);
1074
1075                 lock_page(page);
1076                 WARN_ON(!PageUptodate(page));
1077                 ClearPageUptodate(page);
1078
1079                 memcpy(page_address(page), data, op);
1080
1081                 flush_dcache_page(page);
1082                 SetPageUptodate(page);
1083                 unlock_page(page);
1084
1085                 ntfs_unmap_page(page);
1086
1087                 bytes -= op;
1088                 data = Add2Ptr(data, PAGE_SIZE);
1089         }
1090         return 0;
1091 }
1092
1093 /*
1094  * ntfs_reparse_bytes
1095  *
1096  * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1097  * for unicode string of @uni_len length.
1098  */
1099 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1100 {
1101         /* Header + unicode string + decorated unicode string. */
1102         return sizeof(short) * (2 * uni_len + 4) +
1103                offsetof(struct REPARSE_DATA_BUFFER,
1104                         SymbolicLinkReparseBuffer.PathBuffer);
1105 }
1106
1107 static struct REPARSE_DATA_BUFFER *
1108 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1109                            u32 size, u16 *nsize)
1110 {
1111         int i, err;
1112         struct REPARSE_DATA_BUFFER *rp;
1113         __le16 *rp_name;
1114         typeof(rp->SymbolicLinkReparseBuffer) *rs;
1115
1116         rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1117         if (!rp)
1118                 return ERR_PTR(-ENOMEM);
1119
1120         rs = &rp->SymbolicLinkReparseBuffer;
1121         rp_name = rs->PathBuffer;
1122
1123         /* Convert link name to UTF-16. */
1124         err = ntfs_nls_to_utf16(sbi, symname, size,
1125                                 (struct cpu_str *)(rp_name - 1), 2 * size,
1126                                 UTF16_LITTLE_ENDIAN);
1127         if (err < 0)
1128                 goto out;
1129
1130         /* err = the length of unicode name of symlink. */
1131         *nsize = ntfs_reparse_bytes(err);
1132
1133         if (*nsize > sbi->reparse.max_size) {
1134                 err = -EFBIG;
1135                 goto out;
1136         }
1137
1138         /* Translate Linux '/' into Windows '\'. */
1139         for (i = 0; i < err; i++) {
1140                 if (rp_name[i] == cpu_to_le16('/'))
1141                         rp_name[i] = cpu_to_le16('\\');
1142         }
1143
1144         rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1145         rp->ReparseDataLength =
1146                 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1147                                               SymbolicLinkReparseBuffer));
1148
1149         /* PrintName + SubstituteName. */
1150         rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1151         rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1152         rs->PrintNameLength = rs->SubstituteNameOffset;
1153
1154         /*
1155          * TODO: Use relative path if possible to allow Windows to
1156          * parse this path.
1157          * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1158          */
1159         rs->Flags = 0;
1160
1161         memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1162
1163         /* Decorate SubstituteName. */
1164         rp_name += err;
1165         rp_name[0] = cpu_to_le16('\\');
1166         rp_name[1] = cpu_to_le16('?');
1167         rp_name[2] = cpu_to_le16('?');
1168         rp_name[3] = cpu_to_le16('\\');
1169
1170         return rp;
1171 out:
1172         kfree(rp);
1173         return ERR_PTR(err);
1174 }
1175
1176 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
1177                                 struct inode *dir, struct dentry *dentry,
1178                                 const struct cpu_str *uni, umode_t mode,
1179                                 dev_t dev, const char *symname, u32 size,
1180                                 struct ntfs_fnd *fnd)
1181 {
1182         int err;
1183         struct super_block *sb = dir->i_sb;
1184         struct ntfs_sb_info *sbi = sb->s_fs_info;
1185         const struct qstr *name = &dentry->d_name;
1186         CLST ino = 0;
1187         struct ntfs_inode *dir_ni = ntfs_i(dir);
1188         struct ntfs_inode *ni = NULL;
1189         struct inode *inode = NULL;
1190         struct ATTRIB *attr;
1191         struct ATTR_STD_INFO5 *std5;
1192         struct ATTR_FILE_NAME *fname;
1193         struct MFT_REC *rec;
1194         u32 asize, dsize, sd_size;
1195         enum FILE_ATTRIBUTE fa;
1196         __le32 security_id = SECURITY_ID_INVALID;
1197         CLST vcn;
1198         const void *sd;
1199         u16 t16, nsize = 0, aid = 0;
1200         struct INDEX_ROOT *root, *dir_root;
1201         struct NTFS_DE *e, *new_de = NULL;
1202         struct REPARSE_DATA_BUFFER *rp = NULL;
1203         bool rp_inserted = false;
1204
1205         ni_lock_dir(dir_ni);
1206
1207         dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1208         if (!dir_root) {
1209                 err = -EINVAL;
1210                 goto out1;
1211         }
1212
1213         if (S_ISDIR(mode)) {
1214                 /* Use parent's directory attributes. */
1215                 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1216                      FILE_ATTRIBUTE_ARCHIVE;
1217                 /*
1218                  * By default child directory inherits parent attributes.
1219                  * Root directory is hidden + system.
1220                  * Make an exception for children in root.
1221                  */
1222                 if (dir->i_ino == MFT_REC_ROOT)
1223                         fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1224         } else if (S_ISLNK(mode)) {
1225                 /* It is good idea that link should be the same type (file/dir) as target */
1226                 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1227
1228                 /*
1229                  * Linux: there are dir/file/symlink and so on.
1230                  * NTFS: symlinks are "dir + reparse" or "file + reparse"
1231                  * It is good idea to create:
1232                  * dir + reparse if 'symname' points to directory
1233                  * or
1234                  * file + reparse if 'symname' points to file
1235                  * Unfortunately kern_path hangs if symname contains 'dir'.
1236                  */
1237
1238                 /*
1239                  *      struct path path;
1240                  *
1241                  *      if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1242                  *              struct inode *target = d_inode(path.dentry);
1243                  *
1244                  *              if (S_ISDIR(target->i_mode))
1245                  *                      fa |= FILE_ATTRIBUTE_DIRECTORY;
1246                  *              // if ( target->i_sb == sb ){
1247                  *              //      use relative path?
1248                  *              // }
1249                  *              path_put(&path);
1250                  *      }
1251                  */
1252         } else if (S_ISREG(mode)) {
1253                 if (sbi->options->sparse) {
1254                         /* Sparsed regular file, cause option 'sparse'. */
1255                         fa = FILE_ATTRIBUTE_SPARSE_FILE |
1256                              FILE_ATTRIBUTE_ARCHIVE;
1257                 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1258                         /* Compressed regular file, if parent is compressed. */
1259                         fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1260                 } else {
1261                         /* Regular file, default attributes. */
1262                         fa = FILE_ATTRIBUTE_ARCHIVE;
1263                 }
1264         } else {
1265                 fa = FILE_ATTRIBUTE_ARCHIVE;
1266         }
1267
1268         if (!(mode & 0222))
1269                 fa |= FILE_ATTRIBUTE_READONLY;
1270
1271         /* Allocate PATH_MAX bytes. */
1272         new_de = __getname();
1273         if (!new_de) {
1274                 err = -ENOMEM;
1275                 goto out1;
1276         }
1277
1278         /* Mark rw ntfs as dirty. it will be cleared at umount. */
1279         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1280
1281         /* Step 1: allocate and fill new mft record. */
1282         err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1283         if (err)
1284                 goto out2;
1285
1286         ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY);
1287         if (IS_ERR(ni)) {
1288                 err = PTR_ERR(ni);
1289                 ni = NULL;
1290                 goto out3;
1291         }
1292         inode = &ni->vfs_inode;
1293         inode_init_owner(mnt_userns, inode, dir, mode);
1294         mode = inode->i_mode;
1295
1296         inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
1297                 current_time(inode);
1298
1299         rec = ni->mi.mrec;
1300         rec->hard_links = cpu_to_le16(1);
1301         attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1302
1303         /* Get default security id. */
1304         sd = s_default_security;
1305         sd_size = sizeof(s_default_security);
1306
1307         if (is_ntfs3(sbi)) {
1308                 security_id = dir_ni->std_security_id;
1309                 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1310                         security_id = sbi->security.def_security_id;
1311
1312                         if (security_id == SECURITY_ID_INVALID &&
1313                             !ntfs_insert_security(sbi, sd, sd_size,
1314                                                   &security_id, NULL))
1315                                 sbi->security.def_security_id = security_id;
1316                 }
1317         }
1318
1319         /* Insert standard info. */
1320         std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1321
1322         if (security_id == SECURITY_ID_INVALID) {
1323                 dsize = sizeof(struct ATTR_STD_INFO);
1324         } else {
1325                 dsize = sizeof(struct ATTR_STD_INFO5);
1326                 std5->security_id = security_id;
1327                 ni->std_security_id = security_id;
1328         }
1329         asize = SIZEOF_RESIDENT + dsize;
1330
1331         attr->type = ATTR_STD;
1332         attr->size = cpu_to_le32(asize);
1333         attr->id = cpu_to_le16(aid++);
1334         attr->res.data_off = SIZEOF_RESIDENT_LE;
1335         attr->res.data_size = cpu_to_le32(dsize);
1336
1337         std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1338                 kernel2nt(&inode->i_atime);
1339
1340         ni->std_fa = fa;
1341         std5->fa = fa;
1342
1343         attr = Add2Ptr(attr, asize);
1344
1345         /* Insert file name. */
1346         err = fill_name_de(sbi, new_de, name, uni);
1347         if (err)
1348                 goto out4;
1349
1350         mi_get_ref(&ni->mi, &new_de->ref);
1351
1352         fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1353         mi_get_ref(&dir_ni->mi, &fname->home);
1354         fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1355                 fname->dup.a_time = std5->cr_time;
1356         fname->dup.alloc_size = fname->dup.data_size = 0;
1357         fname->dup.fa = std5->fa;
1358         fname->dup.ea_size = fname->dup.reparse = 0;
1359
1360         dsize = le16_to_cpu(new_de->key_size);
1361         asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1362
1363         attr->type = ATTR_NAME;
1364         attr->size = cpu_to_le32(asize);
1365         attr->res.data_off = SIZEOF_RESIDENT_LE;
1366         attr->res.flags = RESIDENT_FLAG_INDEXED;
1367         attr->id = cpu_to_le16(aid++);
1368         attr->res.data_size = cpu_to_le32(dsize);
1369         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1370
1371         attr = Add2Ptr(attr, asize);
1372
1373         if (security_id == SECURITY_ID_INVALID) {
1374                 /* Insert security attribute. */
1375                 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1376
1377                 attr->type = ATTR_SECURE;
1378                 attr->size = cpu_to_le32(asize);
1379                 attr->id = cpu_to_le16(aid++);
1380                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1381                 attr->res.data_size = cpu_to_le32(sd_size);
1382                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1383
1384                 attr = Add2Ptr(attr, asize);
1385         }
1386
1387         attr->id = cpu_to_le16(aid++);
1388         if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1389                 /*
1390                  * Regular directory or symlink to directory.
1391                  * Create root attribute.
1392                  */
1393                 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1394                 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1395
1396                 attr->type = ATTR_ROOT;
1397                 attr->size = cpu_to_le32(asize);
1398
1399                 attr->name_len = ARRAY_SIZE(I30_NAME);
1400                 attr->name_off = SIZEOF_RESIDENT_LE;
1401                 attr->res.data_off =
1402                         cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1403                 attr->res.data_size = cpu_to_le32(dsize);
1404                 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1405                        sizeof(I30_NAME));
1406
1407                 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1408                 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1409                 root->ihdr.de_off =
1410                         cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10
1411                 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1412                                               sizeof(struct NTFS_DE));
1413                 root->ihdr.total = root->ihdr.used;
1414
1415                 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1416                 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1417                 e->flags = NTFS_IE_LAST;
1418         } else if (S_ISLNK(mode)) {
1419                 /*
1420                  * Symlink to file.
1421                  * Create empty resident data attribute.
1422                  */
1423                 asize = SIZEOF_RESIDENT;
1424
1425                 /* Insert empty ATTR_DATA */
1426                 attr->type = ATTR_DATA;
1427                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1428                 attr->name_off = SIZEOF_RESIDENT_LE;
1429                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1430         } else if (S_ISREG(mode)) {
1431                 /*
1432                  * Regular file. Create empty non resident data attribute.
1433                  */
1434                 attr->type = ATTR_DATA;
1435                 attr->non_res = 1;
1436                 attr->nres.evcn = cpu_to_le64(-1ll);
1437                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1438                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1439                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1440                         attr->flags = ATTR_FLAG_SPARSED;
1441                         asize = SIZEOF_NONRESIDENT_EX + 8;
1442                 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1443                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1444                         attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1445                         attr->flags = ATTR_FLAG_COMPRESSED;
1446                         attr->nres.c_unit = COMPRESSION_UNIT;
1447                         asize = SIZEOF_NONRESIDENT_EX + 8;
1448                 } else {
1449                         attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1450                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1451                         asize = SIZEOF_NONRESIDENT + 8;
1452                 }
1453                 attr->nres.run_off = attr->name_off;
1454         } else {
1455                 /*
1456                  * Node. Create empty resident data attribute.
1457                  */
1458                 attr->type = ATTR_DATA;
1459                 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1460                 attr->name_off = SIZEOF_RESIDENT_LE;
1461                 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1462                         attr->flags = ATTR_FLAG_SPARSED;
1463                 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1464                         attr->flags = ATTR_FLAG_COMPRESSED;
1465                 attr->res.data_off = SIZEOF_RESIDENT_LE;
1466                 asize = SIZEOF_RESIDENT;
1467                 ni->ni_flags |= NI_FLAG_RESIDENT;
1468         }
1469
1470         if (S_ISDIR(mode)) {
1471                 ni->ni_flags |= NI_FLAG_DIR;
1472                 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1473                 if (err)
1474                         goto out4;
1475         } else if (S_ISLNK(mode)) {
1476                 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1477
1478                 if (IS_ERR(rp)) {
1479                         err = PTR_ERR(rp);
1480                         rp = NULL;
1481                         goto out4;
1482                 }
1483
1484                 /*
1485                  * Insert ATTR_REPARSE.
1486                  */
1487                 attr = Add2Ptr(attr, asize);
1488                 attr->type = ATTR_REPARSE;
1489                 attr->id = cpu_to_le16(aid++);
1490
1491                 /* Resident or non resident? */
1492                 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1493                 t16 = PtrOffset(rec, attr);
1494
1495                 /*
1496                  * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1497                  * It is good idea to keep extened attributes resident.
1498                  */
1499                 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1500                         CLST alen;
1501                         CLST clst = bytes_to_cluster(sbi, nsize);
1502
1503                         /* Bytes per runs. */
1504                         t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1505
1506                         attr->non_res = 1;
1507                         attr->nres.evcn = cpu_to_le64(clst - 1);
1508                         attr->name_off = SIZEOF_NONRESIDENT_LE;
1509                         attr->nres.run_off = attr->name_off;
1510                         attr->nres.data_size = cpu_to_le64(nsize);
1511                         attr->nres.valid_size = attr->nres.data_size;
1512                         attr->nres.alloc_size =
1513                                 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1514
1515                         err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1516                                                      clst, NULL, 0, &alen, 0,
1517                                                      NULL);
1518                         if (err)
1519                                 goto out5;
1520
1521                         err = run_pack(&ni->file.run, 0, clst,
1522                                        Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1523                                        &vcn);
1524                         if (err < 0)
1525                                 goto out5;
1526
1527                         if (vcn != clst) {
1528                                 err = -EINVAL;
1529                                 goto out5;
1530                         }
1531
1532                         asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1533                 } else {
1534                         attr->res.data_off = SIZEOF_RESIDENT_LE;
1535                         attr->res.data_size = cpu_to_le32(nsize);
1536                         memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1537                         nsize = 0;
1538                 }
1539                 /* Size of symlink equals the length of input string. */
1540                 inode->i_size = size;
1541
1542                 attr->size = cpu_to_le32(asize);
1543
1544                 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1545                                           &new_de->ref);
1546                 if (err)
1547                         goto out5;
1548
1549                 rp_inserted = true;
1550         }
1551
1552         attr = Add2Ptr(attr, asize);
1553         attr->type = ATTR_END;
1554
1555         rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1556         rec->next_attr_id = cpu_to_le16(aid);
1557
1558         /* Step 2: Add new name in index. */
1559         err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1560         if (err)
1561                 goto out6;
1562
1563         /* Unlock parent directory before ntfs_init_acl. */
1564         ni_unlock(dir_ni);
1565
1566         inode->i_generation = le16_to_cpu(rec->seq);
1567
1568         dir->i_mtime = dir->i_ctime = inode->i_atime;
1569
1570         if (S_ISDIR(mode)) {
1571                 inode->i_op = &ntfs_dir_inode_operations;
1572                 inode->i_fop = &ntfs_dir_operations;
1573         } else if (S_ISLNK(mode)) {
1574                 inode->i_op = &ntfs_link_inode_operations;
1575                 inode->i_fop = NULL;
1576                 inode->i_mapping->a_ops = &ntfs_aops;
1577                 inode->i_size = size;
1578                 inode_nohighmem(inode);
1579         } else if (S_ISREG(mode)) {
1580                 inode->i_op = &ntfs_file_inode_operations;
1581                 inode->i_fop = &ntfs_file_operations;
1582                 inode->i_mapping->a_ops =
1583                         is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
1584                 init_rwsem(&ni->file.run_lock);
1585         } else {
1586                 inode->i_op = &ntfs_special_inode_operations;
1587                 init_special_inode(inode, mode, dev);
1588         }
1589
1590 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1591         if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1592                 err = ntfs_init_acl(mnt_userns, inode, dir);
1593                 if (err)
1594                         goto out7;
1595         } else
1596 #endif
1597         {
1598                 inode->i_flags |= S_NOSEC;
1599         }
1600
1601         /* Write non resident data. */
1602         if (nsize) {
1603                 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0);
1604                 if (err)
1605                         goto out7;
1606         }
1607
1608         /*
1609          * Call 'd_instantiate' after inode->i_op is set
1610          * but before finish_open.
1611          */
1612         d_instantiate(dentry, inode);
1613
1614         ntfs_save_wsl_perm(inode);
1615         mark_inode_dirty(dir);
1616         mark_inode_dirty(inode);
1617
1618         /* Normal exit. */
1619         goto out2;
1620
1621 out7:
1622
1623         /* Undo 'indx_insert_entry'. */
1624         ni_lock_dir(dir_ni);
1625         indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
1626                           le16_to_cpu(new_de->key_size), sbi);
1627         /* ni_unlock(dir_ni); will be called later. */
1628 out6:
1629         if (rp_inserted)
1630                 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1631
1632 out5:
1633         if (S_ISDIR(mode) || run_is_empty(&ni->file.run))
1634                 goto out4;
1635
1636         run_deallocate(sbi, &ni->file.run, false);
1637
1638 out4:
1639         clear_rec_inuse(rec);
1640         clear_nlink(inode);
1641         ni->mi.dirty = false;
1642         discard_new_inode(inode);
1643 out3:
1644         ntfs_mark_rec_free(sbi, ino);
1645
1646 out2:
1647         __putname(new_de);
1648         kfree(rp);
1649
1650 out1:
1651         if (err) {
1652                 ni_unlock(dir_ni);
1653                 return ERR_PTR(err);
1654         }
1655
1656         unlock_new_inode(inode);
1657
1658         return inode;
1659 }
1660
1661 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1662 {
1663         int err;
1664         struct ntfs_inode *ni = ntfs_i(inode);
1665         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1666         struct NTFS_DE *de;
1667         struct ATTR_FILE_NAME *de_name;
1668
1669         /* Allocate PATH_MAX bytes. */
1670         de = __getname();
1671         if (!de)
1672                 return -ENOMEM;
1673
1674         /* Mark rw ntfs as dirty. It will be cleared at umount. */
1675         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1676
1677         /* Construct 'de'. */
1678         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1679         if (err)
1680                 goto out;
1681
1682         de_name = (struct ATTR_FILE_NAME *)(de + 1);
1683         /* Fill duplicate info. */
1684         de_name->dup.cr_time = de_name->dup.m_time = de_name->dup.c_time =
1685                 de_name->dup.a_time = kernel2nt(&inode->i_ctime);
1686         de_name->dup.alloc_size = de_name->dup.data_size =
1687                 cpu_to_le64(inode->i_size);
1688         de_name->dup.fa = ni->std_fa;
1689         de_name->dup.ea_size = de_name->dup.reparse = 0;
1690
1691         err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1692 out:
1693         __putname(de);
1694         return err;
1695 }
1696
1697 /*
1698  * ntfs_unlink_inode
1699  *
1700  * inode_operations::unlink
1701  * inode_operations::rmdir
1702  */
1703 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1704 {
1705         int err;
1706         struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1707         struct inode *inode = d_inode(dentry);
1708         struct ntfs_inode *ni = ntfs_i(inode);
1709         struct ntfs_inode *dir_ni = ntfs_i(dir);
1710         struct NTFS_DE *de, *de2 = NULL;
1711         int undo_remove;
1712
1713         if (ntfs_is_meta_file(sbi, ni->mi.rno))
1714                 return -EINVAL;
1715
1716         /* Allocate PATH_MAX bytes. */
1717         de = __getname();
1718         if (!de)
1719                 return -ENOMEM;
1720
1721         ni_lock(ni);
1722
1723         if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1724                 err = -ENOTEMPTY;
1725                 goto out;
1726         }
1727
1728         err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1729         if (err < 0)
1730                 goto out;
1731
1732         undo_remove = 0;
1733         err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1734
1735         if (!err) {
1736                 drop_nlink(inode);
1737                 dir->i_mtime = dir->i_ctime = current_time(dir);
1738                 mark_inode_dirty(dir);
1739                 inode->i_ctime = dir->i_ctime;
1740                 if (inode->i_nlink)
1741                         mark_inode_dirty(inode);
1742         } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1743                 make_bad_inode(inode);
1744                 ntfs_inode_err(inode, "failed to undo unlink");
1745                 ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
1746         } else {
1747                 if (ni_is_dirty(dir))
1748                         mark_inode_dirty(dir);
1749                 if (ni_is_dirty(inode))
1750                         mark_inode_dirty(inode);
1751         }
1752
1753 out:
1754         ni_unlock(ni);
1755         __putname(de);
1756         return err;
1757 }
1758
1759 void ntfs_evict_inode(struct inode *inode)
1760 {
1761         truncate_inode_pages_final(&inode->i_data);
1762
1763         if (inode->i_nlink)
1764                 _ni_write_inode(inode, inode_needs_sync(inode));
1765
1766         invalidate_inode_buffers(inode);
1767         clear_inode(inode);
1768
1769         ni_clear(ntfs_i(inode));
1770 }
1771
1772 static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer,
1773                                       int buflen)
1774 {
1775         int i, err = -EINVAL;
1776         struct ntfs_inode *ni = ntfs_i(inode);
1777         struct super_block *sb = inode->i_sb;
1778         struct ntfs_sb_info *sbi = sb->s_fs_info;
1779         u64 size;
1780         u16 ulen = 0;
1781         void *to_free = NULL;
1782         struct REPARSE_DATA_BUFFER *rp;
1783         const __le16 *uname;
1784         struct ATTRIB *attr;
1785
1786         /* Reparse data present. Try to parse it. */
1787         static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1788         static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1789
1790         *buffer = 0;
1791
1792         attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1793         if (!attr)
1794                 goto out;
1795
1796         if (!attr->non_res) {
1797                 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1798                 if (!rp)
1799                         goto out;
1800                 size = le32_to_cpu(attr->res.data_size);
1801         } else {
1802                 size = le64_to_cpu(attr->nres.data_size);
1803                 rp = NULL;
1804         }
1805
1806         if (size > sbi->reparse.max_size || size <= sizeof(u32))
1807                 goto out;
1808
1809         if (!rp) {
1810                 rp = kmalloc(size, GFP_NOFS);
1811                 if (!rp) {
1812                         err = -ENOMEM;
1813                         goto out;
1814                 }
1815                 to_free = rp;
1816                 /* Read into temporal buffer. */
1817                 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1818                 if (err)
1819                         goto out;
1820         }
1821
1822         /* Microsoft Tag. */
1823         switch (rp->ReparseTag) {
1824         case IO_REPARSE_TAG_MOUNT_POINT:
1825                 /* Mount points and junctions. */
1826                 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1827                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1828                                      MountPointReparseBuffer.PathBuffer))
1829                         goto out;
1830                 uname = Add2Ptr(rp,
1831                                 offsetof(struct REPARSE_DATA_BUFFER,
1832                                          MountPointReparseBuffer.PathBuffer) +
1833                                         le16_to_cpu(rp->MountPointReparseBuffer
1834                                                             .PrintNameOffset));
1835                 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1836                 break;
1837
1838         case IO_REPARSE_TAG_SYMLINK:
1839                 /* FolderSymbolicLink */
1840                 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1841                 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1842                                      SymbolicLinkReparseBuffer.PathBuffer))
1843                         goto out;
1844                 uname = Add2Ptr(
1845                         rp, offsetof(struct REPARSE_DATA_BUFFER,
1846                                      SymbolicLinkReparseBuffer.PathBuffer) +
1847                                     le16_to_cpu(rp->SymbolicLinkReparseBuffer
1848                                                         .PrintNameOffset));
1849                 ulen = le16_to_cpu(
1850                         rp->SymbolicLinkReparseBuffer.PrintNameLength);
1851                 break;
1852
1853         case IO_REPARSE_TAG_CLOUD:
1854         case IO_REPARSE_TAG_CLOUD_1:
1855         case IO_REPARSE_TAG_CLOUD_2:
1856         case IO_REPARSE_TAG_CLOUD_3:
1857         case IO_REPARSE_TAG_CLOUD_4:
1858         case IO_REPARSE_TAG_CLOUD_5:
1859         case IO_REPARSE_TAG_CLOUD_6:
1860         case IO_REPARSE_TAG_CLOUD_7:
1861         case IO_REPARSE_TAG_CLOUD_8:
1862         case IO_REPARSE_TAG_CLOUD_9:
1863         case IO_REPARSE_TAG_CLOUD_A:
1864         case IO_REPARSE_TAG_CLOUD_B:
1865         case IO_REPARSE_TAG_CLOUD_C:
1866         case IO_REPARSE_TAG_CLOUD_D:
1867         case IO_REPARSE_TAG_CLOUD_E:
1868         case IO_REPARSE_TAG_CLOUD_F:
1869                 err = sizeof("OneDrive") - 1;
1870                 if (err > buflen)
1871                         err = buflen;
1872                 memcpy(buffer, "OneDrive", err);
1873                 goto out;
1874
1875         default:
1876                 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
1877                         /* Unknown Microsoft Tag. */
1878                         goto out;
1879                 }
1880                 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
1881                     size <= sizeof(struct REPARSE_POINT)) {
1882                         goto out;
1883                 }
1884
1885                 /* Users tag. */
1886                 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
1887                 ulen = le16_to_cpu(rp->ReparseDataLength) -
1888                        sizeof(struct REPARSE_POINT);
1889         }
1890
1891         /* Convert nlen from bytes to UNICODE chars. */
1892         ulen >>= 1;
1893
1894         /* Check that name is available. */
1895         if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
1896                 goto out;
1897
1898         /* If name is already zero terminated then truncate it now. */
1899         if (!uname[ulen - 1])
1900                 ulen -= 1;
1901
1902         err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
1903
1904         if (err < 0)
1905                 goto out;
1906
1907         /* Translate Windows '\' into Linux '/'. */
1908         for (i = 0; i < err; i++) {
1909                 if (buffer[i] == '\\')
1910                         buffer[i] = '/';
1911         }
1912
1913         /* Always set last zero. */
1914         buffer[err] = 0;
1915 out:
1916         kfree(to_free);
1917         return err;
1918 }
1919
1920 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
1921                                  struct delayed_call *done)
1922 {
1923         int err;
1924         char *ret;
1925
1926         if (!de)
1927                 return ERR_PTR(-ECHILD);
1928
1929         ret = kmalloc(PAGE_SIZE, GFP_NOFS);
1930         if (!ret)
1931                 return ERR_PTR(-ENOMEM);
1932
1933         err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE);
1934         if (err < 0) {
1935                 kfree(ret);
1936                 return ERR_PTR(err);
1937         }
1938
1939         set_delayed_call(done, kfree_link, ret);
1940
1941         return ret;
1942 }
1943
1944 // clang-format off
1945 const struct inode_operations ntfs_link_inode_operations = {
1946         .get_link       = ntfs_get_link,
1947         .setattr        = ntfs3_setattr,
1948         .listxattr      = ntfs_listxattr,
1949         .permission     = ntfs_permission,
1950 };
1951
1952 const struct address_space_operations ntfs_aops = {
1953         .readpage       = ntfs_readpage,
1954         .readahead      = ntfs_readahead,
1955         .writepage      = ntfs_writepage,
1956         .writepages     = ntfs_writepages,
1957         .write_begin    = ntfs_write_begin,
1958         .write_end      = ntfs_write_end,
1959         .direct_IO      = ntfs_direct_IO,
1960         .bmap           = ntfs_bmap,
1961         .set_page_dirty = __set_page_dirty_buffers,
1962 };
1963
1964 const struct address_space_operations ntfs_aops_cmpr = {
1965         .readpage       = ntfs_readpage,
1966         .readahead      = ntfs_readahead,
1967 };
1968 // clang-format on