fs/ntfs3/inode.c

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