fs/ntfs3/file.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *
   4  * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
   5  *
   6  *  Regular file handling primitives for NTFS-based filesystems.
   7  *
   8  */
   9
  10 #include <linux/backing-dev.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/buffer_head.h>
  13 #include <linux/compat.h>
  14 #include <linux/falloc.h>
  15 #include <linux/fiemap.h>
  16
  17 #include "debug.h"
  18 #include "ntfs.h"
  19 #include "ntfs_fs.h"
  20
  21 static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
  22 {
  23         struct fstrim_range __user *user_range;
  24         struct fstrim_range range;
  25         struct block_device *dev;
  26         int err;
  27
  28         if (!capable(CAP_SYS_ADMIN))
  29                 return -EPERM;
  30
  31         dev = sbi->sb->s_bdev;
  32         if (!bdev_max_discard_sectors(dev))
  33                 return -EOPNOTSUPP;
  34
  35         user_range = (struct fstrim_range __user *)arg;
  36         if (copy_from_user(&range, user_range, sizeof(range)))
  37                 return -EFAULT;
  38
  39         range.minlen = max_t(u32, range.minlen, bdev_discard_granularity(dev));
  40
  41         err = ntfs_trim_fs(sbi, &range);
  42         if (err < 0)
  43                 return err;
  44
  45         if (copy_to_user(user_range, &range, sizeof(range)))
  46                 return -EFAULT;
  47
  48         return 0;
  49 }
  50
  51 long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg)
  52 {
  53         struct inode *inode = file_inode(filp);
  54         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
  55
  56         switch (cmd) {
  57         case FITRIM:
  58                 return ntfs_ioctl_fitrim(sbi, arg);
  59         }
  60         return -ENOTTY; /* Inappropriate ioctl for device. */
  61 }
  62
  63 #ifdef CONFIG_COMPAT
  64 long ntfs_compat_ioctl(struct file *filp, u32 cmd, unsigned long arg)
  65
  66 {
  67         return ntfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
  68 }
  69 #endif
  70
  71 /*
  72  * ntfs_getattr - inode_operations::getattr
  73  */
  74 int ntfs_getattr(struct mnt_idmap *idmap, const struct path *path,
  75                  struct kstat *stat, u32 request_mask, u32 flags)
  76 {
  77         struct inode *inode = d_inode(path->dentry);
  78         struct ntfs_inode *ni = ntfs_i(inode);
  79
  80         if (is_compressed(ni))
  81                 stat->attributes |= STATX_ATTR_COMPRESSED;
  82
  83         if (is_encrypted(ni))
  84                 stat->attributes |= STATX_ATTR_ENCRYPTED;
  85
  86         stat->attributes_mask |= STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED;
  87
  88         generic_fillattr(idmap, request_mask, inode, stat);
  89
  90         stat->result_mask |= STATX_BTIME;
  91         stat->btime = ni->i_crtime;
  92         stat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */
  93
  94         return 0;
  95 }
  96
  97 static int ntfs_extend_initialized_size(struct file *file,
  98                                         struct ntfs_inode *ni,
  99                                         const loff_t valid,
 100                                         const loff_t new_valid)
 101 {
 102         struct inode *inode = &ni->vfs_inode;
 103         struct address_space *mapping = inode->i_mapping;
 104         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
 105         loff_t pos = valid;
 106         int err;
 107
 108         if (is_resident(ni)) {
 109                 ni->i_valid = new_valid;
 110                 return 0;
 111         }
 112
 113         WARN_ON(is_compressed(ni));
 114         WARN_ON(valid >= new_valid);
 115
 116         for (;;) {
 117                 u32 zerofrom, len;
 118                 struct page *page;
 119                 u8 bits;
 120                 CLST vcn, lcn, clen;
 121
 122                 if (is_sparsed(ni)) {
 123                         bits = sbi->cluster_bits;
 124                         vcn = pos >> bits;
 125
 126                         err = attr_data_get_block(ni, vcn, 1, &lcn, &clen, NULL,
 127                                                   false);
 128                         if (err)
 129                                 goto out;
 130
 131                         if (lcn == SPARSE_LCN) {
 132                                 pos = ((loff_t)clen + vcn) << bits;
 133                                 ni->i_valid = pos;
 134                                 goto next;
 135                         }
 136                 }
 137
 138                 zerofrom = pos & (PAGE_SIZE - 1);
 139                 len = PAGE_SIZE - zerofrom;
 140
 141                 if (pos + len > new_valid)
 142                         len = new_valid - pos;
 143
 144                 err = ntfs_write_begin(file, mapping, pos, len, &page, NULL);
 145                 if (err)
 146                         goto out;
 147
 148                 zero_user_segment(page, zerofrom, PAGE_SIZE);
 149
 150                 /* This function in any case puts page. */
 151                 err = ntfs_write_end(file, mapping, pos, len, len, page, NULL);
 152                 if (err < 0)
 153                         goto out;
 154                 pos += len;
 155
 156 next:
 157                 if (pos >= new_valid)
 158                         break;
 159
 160                 balance_dirty_pages_ratelimited(mapping);
 161                 cond_resched();
 162         }
 163
 164         return 0;
 165
 166 out:
 167         ni->i_valid = valid;
 168         ntfs_inode_warn(inode, "failed to extend initialized size to %llx.",
 169                         new_valid);
 170         return err;
 171 }
 172
 173 /*
 174  * ntfs_zero_range - Helper function for punch_hole.
 175  *
 176  * It zeroes a range [vbo, vbo_to).
 177  */
 178 static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
 179 {
 180         int err = 0;
 181         struct address_space *mapping = inode->i_mapping;
 182         u32 blocksize = i_blocksize(inode);
 183         pgoff_t idx = vbo >> PAGE_SHIFT;
 184         u32 from = vbo & (PAGE_SIZE - 1);
 185         pgoff_t idx_end = (vbo_to + PAGE_SIZE - 1) >> PAGE_SHIFT;
 186         loff_t page_off;
 187         struct buffer_head *head, *bh;
 188         u32 bh_next, bh_off, to;
 189         sector_t iblock;
 190         struct folio *folio;
 191         bool dirty = false;
 192
 193         for (; idx < idx_end; idx += 1, from = 0) {
 194                 page_off = (loff_t)idx << PAGE_SHIFT;
 195                 to = (page_off + PAGE_SIZE) > vbo_to ? (vbo_to - page_off) :
 196                                                        PAGE_SIZE;
 197                 iblock = page_off >> inode->i_blkbits;
 198
 199                 folio = __filemap_get_folio(mapping, idx,
 200                                 FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
 201                                 mapping_gfp_constraint(mapping, ~__GFP_FS));
 202                 if (IS_ERR(folio))
 203                         return PTR_ERR(folio);
 204
 205                 head = folio_buffers(folio);
 206                 if (!head)
 207                         head = create_empty_buffers(folio, blocksize, 0);
 208
 209                 bh = head;
 210                 bh_off = 0;
 211                 do {
 212                         bh_next = bh_off + blocksize;
 213
 214                         if (bh_next <= from || bh_off >= to)
 215                                 continue;
 216
 217                         if (!buffer_mapped(bh)) {
 218                                 ntfs_get_block(inode, iblock, bh, 0);
 219                                 /* Unmapped? It's a hole - nothing to do. */
 220                                 if (!buffer_mapped(bh))
 221                                         continue;
 222                         }
 223
 224                         /* Ok, it's mapped. Make sure it's up-to-date. */
 225                         if (folio_test_uptodate(folio))
 226                                 set_buffer_uptodate(bh);
 227                         else if (bh_read(bh, 0) < 0) {
 228                                 err = -EIO;
 229                                 folio_unlock(folio);
 230                                 folio_put(folio);
 231                                 goto out;
 232                         }
 233
 234                         mark_buffer_dirty(bh);
 235                 } while (bh_off = bh_next, iblock += 1,
 236                          head != (bh = bh->b_this_page));
 237
 238                 folio_zero_segment(folio, from, to);
 239                 dirty = true;
 240
 241                 folio_unlock(folio);
 242                 folio_put(folio);
 243                 cond_resched();
 244         }
 245 out:
 246         if (dirty)
 247                 mark_inode_dirty(inode);
 248         return err;
 249 }
 250
 251 /*
 252  * ntfs_file_mmap - file_operations::mmap
 253  */
 254 static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma)
 255 {
 256         struct address_space *mapping = file->f_mapping;
 257         struct inode *inode = mapping->host;
 258         struct ntfs_inode *ni = ntfs_i(inode);
 259         u64 from = ((u64)vma->vm_pgoff << PAGE_SHIFT);
 260         bool rw = vma->vm_flags & VM_WRITE;
 261         int err;
 262
 263         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 264                 return -EIO;
 265
 266         if (is_encrypted(ni)) {
 267                 ntfs_inode_warn(inode, "mmap encrypted not supported");
 268                 return -EOPNOTSUPP;
 269         }
 270
 271         if (is_dedup(ni)) {
 272                 ntfs_inode_warn(inode, "mmap deduplicated not supported");
 273                 return -EOPNOTSUPP;
 274         }
 275
 276         if (is_compressed(ni) && rw) {
 277                 ntfs_inode_warn(inode, "mmap(write) compressed not supported");
 278                 return -EOPNOTSUPP;
 279         }
 280
 281         if (rw) {
 282                 u64 to = min_t(loff_t, i_size_read(inode),
 283                                from + vma->vm_end - vma->vm_start);
 284
 285                 if (is_sparsed(ni)) {
 286                         /* Allocate clusters for rw map. */
 287                         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
 288                         CLST lcn, len;
 289                         CLST vcn = from >> sbi->cluster_bits;
 290                         CLST end = bytes_to_cluster(sbi, to);
 291                         bool new;
 292
 293                         for (; vcn < end; vcn += len) {
 294                                 err = attr_data_get_block(ni, vcn, 1, &lcn,
 295                                                           &len, &new, true);
 296                                 if (err)
 297                                         goto out;
 298                         }
 299                 }
 300
 301                 if (ni->i_valid < to) {
 302                         if (!inode_trylock(inode)) {
 303                                 err = -EAGAIN;
 304                                 goto out;
 305                         }
 306                         err = ntfs_extend_initialized_size(file, ni,
 307                                                            ni->i_valid, to);
 308                         inode_unlock(inode);
 309                         if (err)
 310                                 goto out;
 311                 }
 312         }
 313
 314         err = generic_file_mmap(file, vma);
 315 out:
 316         return err;
 317 }
 318
 319 static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
 320                        struct file *file)
 321 {
 322         struct ntfs_inode *ni = ntfs_i(inode);
 323         struct address_space *mapping = inode->i_mapping;
 324         loff_t end = pos + count;
 325         bool extend_init = file && pos > ni->i_valid;
 326         int err;
 327
 328         if (end <= inode->i_size && !extend_init)
 329                 return 0;
 330
 331         /* Mark rw ntfs as dirty. It will be cleared at umount. */
 332         ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
 333
 334         if (end > inode->i_size) {
 335                 err = ntfs_set_size(inode, end);
 336                 if (err)
 337                         goto out;
 338         }
 339
 340         if (extend_init && !is_compressed(ni)) {
 341                 err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
 342                 if (err)
 343                         goto out;
 344         } else {
 345                 err = 0;
 346         }
 347
 348         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 349         mark_inode_dirty(inode);
 350
 351         if (IS_SYNC(inode)) {
 352                 int err2;
 353
 354                 err = filemap_fdatawrite_range(mapping, pos, end - 1);
 355                 err2 = sync_mapping_buffers(mapping);
 356                 if (!err)
 357                         err = err2;
 358                 err2 = write_inode_now(inode, 1);
 359                 if (!err)
 360                         err = err2;
 361                 if (!err)
 362                         err = filemap_fdatawait_range(mapping, pos, end - 1);
 363         }
 364
 365 out:
 366         return err;
 367 }
 368
 369 static int ntfs_truncate(struct inode *inode, loff_t new_size)
 370 {
 371         struct super_block *sb = inode->i_sb;
 372         struct ntfs_inode *ni = ntfs_i(inode);
 373         int err, dirty = 0;
 374         u64 new_valid;
 375
 376         if (!S_ISREG(inode->i_mode))
 377                 return 0;
 378
 379         if (is_compressed(ni)) {
 380                 if (ni->i_valid > new_size)
 381                         ni->i_valid = new_size;
 382         } else {
 383                 err = block_truncate_page(inode->i_mapping, new_size,
 384                                           ntfs_get_block);
 385                 if (err)
 386                         return err;
 387         }
 388
 389         new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size));
 390
 391         truncate_setsize(inode, new_size);
 392
 393         ni_lock(ni);
 394
 395         down_write(&ni->file.run_lock);
 396         err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 397                             &new_valid, ni->mi.sbi->options->prealloc, NULL);
 398         up_write(&ni->file.run_lock);
 399
 400         if (new_valid < ni->i_valid)
 401                 ni->i_valid = new_valid;
 402
 403         ni_unlock(ni);
 404
 405         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 406         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 407         if (!IS_DIRSYNC(inode)) {
 408                 dirty = 1;
 409         } else {
 410                 err = ntfs_sync_inode(inode);
 411                 if (err)
 412                         return err;
 413         }
 414
 415         if (dirty)
 416                 mark_inode_dirty(inode);
 417
 418         /*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/
 419
 420         return 0;
 421 }
 422
 423 /*
 424  * ntfs_fallocate
 425  *
 426  * Preallocate space for a file. This implements ntfs's fallocate file
 427  * operation, which gets called from sys_fallocate system call. User
 428  * space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set
 429  * we just allocate clusters without zeroing them out. Otherwise we
 430  * allocate and zero out clusters via an expanding truncate.
 431  */
 432 static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
 433 {
 434         struct inode *inode = file->f_mapping->host;
 435         struct address_space *mapping = inode->i_mapping;
 436         struct super_block *sb = inode->i_sb;
 437         struct ntfs_sb_info *sbi = sb->s_fs_info;
 438         struct ntfs_inode *ni = ntfs_i(inode);
 439         loff_t end = vbo + len;
 440         loff_t vbo_down = round_down(vbo, max_t(unsigned long,
 441                                                 sbi->cluster_size, PAGE_SIZE));
 442         bool is_supported_holes = is_sparsed(ni) || is_compressed(ni);
 443         loff_t i_size, new_size;
 444         bool map_locked;
 445         int err;
 446
 447         /* No support for dir. */
 448         if (!S_ISREG(inode->i_mode))
 449                 return -EOPNOTSUPP;
 450
 451         /*
 452          * vfs_fallocate checks all possible combinations of mode.
 453          * Do additional checks here before ntfs_set_state(dirty).
 454          */
 455         if (mode & FALLOC_FL_PUNCH_HOLE) {
 456                 if (!is_supported_holes)
 457                         return -EOPNOTSUPP;
 458         } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
 459         } else if (mode & FALLOC_FL_INSERT_RANGE) {
 460                 if (!is_supported_holes)
 461                         return -EOPNOTSUPP;
 462         } else if (mode &
 463                    ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
 464                      FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)) {
 465                 ntfs_inode_warn(inode, "fallocate(0x%x) is not supported",
 466                                 mode);
 467                 return -EOPNOTSUPP;
 468         }
 469
 470         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
 471
 472         inode_lock(inode);
 473         i_size = inode->i_size;
 474         new_size = max(end, i_size);
 475         map_locked = false;
 476
 477         if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
 478                 /* Should never be here, see ntfs_file_open. */
 479                 err = -EOPNOTSUPP;
 480                 goto out;
 481         }
 482
 483         if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE |
 484                     FALLOC_FL_INSERT_RANGE)) {
 485                 inode_dio_wait(inode);
 486                 filemap_invalidate_lock(mapping);
 487                 map_locked = true;
 488         }
 489
 490         if (mode & FALLOC_FL_PUNCH_HOLE) {
 491                 u32 frame_size;
 492                 loff_t mask, vbo_a, end_a, tmp;
 493
 494                 err = filemap_write_and_wait_range(mapping, vbo_down,
 495                                                    LLONG_MAX);
 496                 if (err)
 497                         goto out;
 498
 499                 truncate_pagecache(inode, vbo_down);
 500
 501                 ni_lock(ni);
 502                 err = attr_punch_hole(ni, vbo, len, &frame_size);
 503                 ni_unlock(ni);
 504                 if (!err)
 505                         goto ok;
 506
 507                 if (err != E_NTFS_NOTALIGNED)
 508                         goto out;
 509
 510                 /* Process not aligned punch. */
 511                 err = 0;
 512                 mask = frame_size - 1;
 513                 vbo_a = (vbo + mask) & ~mask;
 514                 end_a = end & ~mask;
 515
 516                 tmp = min(vbo_a, end);
 517                 if (tmp > vbo) {
 518                         err = ntfs_zero_range(inode, vbo, tmp);
 519                         if (err)
 520                                 goto out;
 521                 }
 522
 523                 if (vbo < end_a && end_a < end) {
 524                         err = ntfs_zero_range(inode, end_a, end);
 525                         if (err)
 526                                 goto out;
 527                 }
 528
 529                 /* Aligned punch_hole */
 530                 if (end_a > vbo_a) {
 531                         ni_lock(ni);
 532                         err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL);
 533                         ni_unlock(ni);
 534                         if (err)
 535                                 goto out;
 536                 }
 537         } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
 538                 /*
 539                  * Write tail of the last page before removed range since
 540                  * it will get removed from the page cache below.
 541                  */
 542                 err = filemap_write_and_wait_range(mapping, vbo_down, vbo);
 543                 if (err)
 544                         goto out;
 545
 546                 /*
 547                  * Write data that will be shifted to preserve them
 548                  * when discarding page cache below.
 549                  */
 550                 err = filemap_write_and_wait_range(mapping, end, LLONG_MAX);
 551                 if (err)
 552                         goto out;
 553
 554                 truncate_pagecache(inode, vbo_down);
 555
 556                 ni_lock(ni);
 557                 err = attr_collapse_range(ni, vbo, len);
 558                 ni_unlock(ni);
 559         } else if (mode & FALLOC_FL_INSERT_RANGE) {
 560                 /* Check new size. */
 561                 err = inode_newsize_ok(inode, new_size);
 562                 if (err)
 563                         goto out;
 564
 565                 /* Write out all dirty pages. */
 566                 err = filemap_write_and_wait_range(mapping, vbo_down,
 567                                                    LLONG_MAX);
 568                 if (err)
 569                         goto out;
 570                 truncate_pagecache(inode, vbo_down);
 571
 572                 ni_lock(ni);
 573                 err = attr_insert_range(ni, vbo, len);
 574                 ni_unlock(ni);
 575                 if (err)
 576                         goto out;
 577         } else {
 578                 /* Check new size. */
 579                 u8 cluster_bits = sbi->cluster_bits;
 580
 581                 /* generic/213: expected -ENOSPC instead of -EFBIG. */
 582                 if (!is_supported_holes) {
 583                         loff_t to_alloc = new_size - inode_get_bytes(inode);
 584
 585                         if (to_alloc > 0 &&
 586                             (to_alloc >> cluster_bits) >
 587                                     wnd_zeroes(&sbi->used.bitmap)) {
 588                                 err = -ENOSPC;
 589                                 goto out;
 590                         }
 591                 }
 592
 593                 err = inode_newsize_ok(inode, new_size);
 594                 if (err)
 595                         goto out;
 596
 597                 if (new_size > i_size) {
 598                         /*
 599                          * Allocate clusters, do not change 'valid' size.
 600                          */
 601                         err = ntfs_set_size(inode, new_size);
 602                         if (err)
 603                                 goto out;
 604                 }
 605
 606                 if (is_supported_holes) {
 607                         CLST vcn = vbo >> cluster_bits;
 608                         CLST cend = bytes_to_cluster(sbi, end);
 609                         CLST cend_v = bytes_to_cluster(sbi, ni->i_valid);
 610                         CLST lcn, clen;
 611                         bool new;
 612
 613                         if (cend_v > cend)
 614                                 cend_v = cend;
 615
 616                         /*
 617                          * Allocate and zero new clusters.
 618                          * Zeroing these clusters may be too long.
 619                          */
 620                         for (; vcn < cend_v; vcn += clen) {
 621                                 err = attr_data_get_block(ni, vcn, cend_v - vcn,
 622                                                           &lcn, &clen, &new,
 623                                                           true);
 624                                 if (err)
 625                                         goto out;
 626                         }
 627                         /*
 628                          * Allocate but not zero new clusters.
 629                          */
 630                         for (; vcn < cend; vcn += clen) {
 631                                 err = attr_data_get_block(ni, vcn, cend - vcn,
 632                                                           &lcn, &clen, &new,
 633                                                           false);
 634                                 if (err)
 635                                         goto out;
 636                         }
 637                 }
 638
 639                 if (mode & FALLOC_FL_KEEP_SIZE) {
 640                         ni_lock(ni);
 641                         /* True - Keep preallocated. */
 642                         err = attr_set_size(ni, ATTR_DATA, NULL, 0,
 643                                             &ni->file.run, i_size, &ni->i_valid,
 644                                             true, NULL);
 645                         ni_unlock(ni);
 646                         if (err)
 647                                 goto out;
 648                 } else if (new_size > i_size) {
 649                         i_size_write(inode, new_size);
 650                 }
 651         }
 652
 653 ok:
 654         err = file_modified(file);
 655         if (err)
 656                 goto out;
 657
 658 out:
 659         if (map_locked)
 660                 filemap_invalidate_unlock(mapping);
 661
 662         if (!err) {
 663                 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 664                 mark_inode_dirty(inode);
 665         }
 666
 667         inode_unlock(inode);
 668         return err;
 669 }
 670
 671 /*
 672  * ntfs3_setattr - inode_operations::setattr
 673  */
 674 int ntfs3_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 675                   struct iattr *attr)
 676 {
 677         struct inode *inode = d_inode(dentry);
 678         struct ntfs_inode *ni = ntfs_i(inode);
 679         u32 ia_valid = attr->ia_valid;
 680         umode_t mode = inode->i_mode;
 681         int err;
 682
 683         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 684                 return -EIO;
 685
 686         err = setattr_prepare(idmap, dentry, attr);
 687         if (err)
 688                 goto out;
 689
 690         if (ia_valid & ATTR_SIZE) {
 691                 loff_t newsize, oldsize;
 692
 693                 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
 694                         /* Should never be here, see ntfs_file_open(). */
 695                         err = -EOPNOTSUPP;
 696                         goto out;
 697                 }
 698                 inode_dio_wait(inode);
 699                 oldsize = i_size_read(inode);
 700                 newsize = attr->ia_size;
 701
 702                 if (newsize <= oldsize)
 703                         err = ntfs_truncate(inode, newsize);
 704                 else
 705                         err = ntfs_extend(inode, newsize, 0, NULL);
 706
 707                 if (err)
 708                         goto out;
 709
 710                 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
 711                 i_size_write(inode, newsize);
 712         }
 713
 714         setattr_copy(idmap, inode, attr);
 715
 716         if (mode != inode->i_mode) {
 717                 err = ntfs_acl_chmod(idmap, dentry);
 718                 if (err)
 719                         goto out;
 720
 721                 /* Linux 'w' -> Windows 'ro'. */
 722                 if (0222 & inode->i_mode)
 723                         ni->std_fa &= ~FILE_ATTRIBUTE_READONLY;
 724                 else
 725                         ni->std_fa |= FILE_ATTRIBUTE_READONLY;
 726         }
 727
 728         if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE))
 729                 ntfs_save_wsl_perm(inode, NULL);
 730         mark_inode_dirty(inode);
 731 out:
 732         return err;
 733 }
 734
 735 static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 736 {
 737         struct file *file = iocb->ki_filp;
 738         struct inode *inode = file->f_mapping->host;
 739         struct ntfs_inode *ni = ntfs_i(inode);
 740
 741         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 742                 return -EIO;
 743
 744         if (is_encrypted(ni)) {
 745                 ntfs_inode_warn(inode, "encrypted i/o not supported");
 746                 return -EOPNOTSUPP;
 747         }
 748
 749         if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
 750                 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
 751                 return -EOPNOTSUPP;
 752         }
 753
 754 #ifndef CONFIG_NTFS3_LZX_XPRESS
 755         if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) {
 756                 ntfs_inode_warn(
 757                         inode,
 758                         "activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files");
 759                 return -EOPNOTSUPP;
 760         }
 761 #endif
 762
 763         if (is_dedup(ni)) {
 764                 ntfs_inode_warn(inode, "read deduplicated not supported");
 765                 return -EOPNOTSUPP;
 766         }
 767
 768         return generic_file_read_iter(iocb, iter);
 769 }
 770
 771 static ssize_t ntfs_file_splice_read(struct file *in, loff_t *ppos,
 772                                      struct pipe_inode_info *pipe, size_t len,
 773                                      unsigned int flags)
 774 {
 775         struct inode *inode = in->f_mapping->host;
 776         struct ntfs_inode *ni = ntfs_i(inode);
 777
 778         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 779                 return -EIO;
 780
 781         if (is_encrypted(ni)) {
 782                 ntfs_inode_warn(inode, "encrypted i/o not supported");
 783                 return -EOPNOTSUPP;
 784         }
 785
 786 #ifndef CONFIG_NTFS3_LZX_XPRESS
 787         if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) {
 788                 ntfs_inode_warn(
 789                         inode,
 790                         "activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files");
 791                 return -EOPNOTSUPP;
 792         }
 793 #endif
 794
 795         if (is_dedup(ni)) {
 796                 ntfs_inode_warn(inode, "read deduplicated not supported");
 797                 return -EOPNOTSUPP;
 798         }
 799
 800         return filemap_splice_read(in, ppos, pipe, len, flags);
 801 }
 802
 803 /*
 804  * ntfs_get_frame_pages
 805  *
 806  * Return: Array of locked pages.
 807  */
 808 static int ntfs_get_frame_pages(struct address_space *mapping, pgoff_t index,
 809                                 struct page **pages, u32 pages_per_frame,
 810                                 bool *frame_uptodate)
 811 {
 812         gfp_t gfp_mask = mapping_gfp_mask(mapping);
 813         u32 npages;
 814
 815         *frame_uptodate = true;
 816
 817         for (npages = 0; npages < pages_per_frame; npages++, index++) {
 818                 struct page *page;
 819
 820                 page = find_or_create_page(mapping, index, gfp_mask);
 821                 if (!page) {
 822                         while (npages--) {
 823                                 page = pages[npages];
 824                                 unlock_page(page);
 825                                 put_page(page);
 826                         }
 827
 828                         return -ENOMEM;
 829                 }
 830
 831                 if (!PageUptodate(page))
 832                         *frame_uptodate = false;
 833
 834                 pages[npages] = page;
 835         }
 836
 837         return 0;
 838 }
 839
 840 /*
 841  * ntfs_compress_write - Helper for ntfs_file_write_iter() (compressed files).
 842  */
 843 static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
 844 {
 845         int err;
 846         struct file *file = iocb->ki_filp;
 847         size_t count = iov_iter_count(from);
 848         loff_t pos = iocb->ki_pos;
 849         struct inode *inode = file_inode(file);
 850         loff_t i_size = i_size_read(inode);
 851         struct address_space *mapping = inode->i_mapping;
 852         struct ntfs_inode *ni = ntfs_i(inode);
 853         u64 valid = ni->i_valid;
 854         struct ntfs_sb_info *sbi = ni->mi.sbi;
 855         struct page *page, **pages = NULL;
 856         size_t written = 0;
 857         u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits;
 858         u32 frame_size = 1u << frame_bits;
 859         u32 pages_per_frame = frame_size >> PAGE_SHIFT;
 860         u32 ip, off;
 861         CLST frame;
 862         u64 frame_vbo;
 863         pgoff_t index;
 864         bool frame_uptodate;
 865
 866         if (frame_size < PAGE_SIZE) {
 867                 /*
 868                  * frame_size == 8K if cluster 512
 869                  * frame_size == 64K if cluster 4096
 870                  */
 871                 ntfs_inode_warn(inode, "page size is bigger than frame size");
 872                 return -EOPNOTSUPP;
 873         }
 874
 875         pages = kmalloc_array(pages_per_frame, sizeof(struct page *), GFP_NOFS);
 876         if (!pages)
 877                 return -ENOMEM;
 878
 879         err = file_remove_privs(file);
 880         if (err)
 881                 goto out;
 882
 883         err = file_update_time(file);
 884         if (err)
 885                 goto out;
 886
 887         /* Zero range [valid : pos). */
 888         while (valid < pos) {
 889                 CLST lcn, clen;
 890
 891                 frame = valid >> frame_bits;
 892                 frame_vbo = valid & ~(frame_size - 1);
 893                 off = valid & (frame_size - 1);
 894
 895                 err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 1, &lcn,
 896                                           &clen, NULL, false);
 897                 if (err)
 898                         goto out;
 899
 900                 if (lcn == SPARSE_LCN) {
 901                         ni->i_valid = valid =
 902                                 frame_vbo + ((u64)clen << sbi->cluster_bits);
 903                         continue;
 904                 }
 905
 906                 /* Load full frame. */
 907                 err = ntfs_get_frame_pages(mapping, frame_vbo >> PAGE_SHIFT,
 908                                            pages, pages_per_frame,
 909                                            &frame_uptodate);
 910                 if (err)
 911                         goto out;
 912
 913                 if (!frame_uptodate && off) {
 914                         err = ni_read_frame(ni, frame_vbo, pages,
 915                                             pages_per_frame);
 916                         if (err) {
 917                                 for (ip = 0; ip < pages_per_frame; ip++) {
 918                                         page = pages[ip];
 919                                         unlock_page(page);
 920                                         put_page(page);
 921                                 }
 922                                 goto out;
 923                         }
 924                 }
 925
 926                 ip = off >> PAGE_SHIFT;
 927                 off = offset_in_page(valid);
 928                 for (; ip < pages_per_frame; ip++, off = 0) {
 929                         page = pages[ip];
 930                         zero_user_segment(page, off, PAGE_SIZE);
 931                         flush_dcache_page(page);
 932                         SetPageUptodate(page);
 933                 }
 934
 935                 ni_lock(ni);
 936                 err = ni_write_frame(ni, pages, pages_per_frame);
 937                 ni_unlock(ni);
 938
 939                 for (ip = 0; ip < pages_per_frame; ip++) {
 940                         page = pages[ip];
 941                         SetPageUptodate(page);
 942                         unlock_page(page);
 943                         put_page(page);
 944                 }
 945
 946                 if (err)
 947                         goto out;
 948
 949                 ni->i_valid = valid = frame_vbo + frame_size;
 950         }
 951
 952         /* Copy user data [pos : pos + count). */
 953         while (count) {
 954                 size_t copied, bytes;
 955
 956                 off = pos & (frame_size - 1);
 957                 bytes = frame_size - off;
 958                 if (bytes > count)
 959                         bytes = count;
 960
 961                 frame_vbo = pos & ~(frame_size - 1);
 962                 index = frame_vbo >> PAGE_SHIFT;
 963
 964                 if (unlikely(fault_in_iov_iter_readable(from, bytes))) {
 965                         err = -EFAULT;
 966                         goto out;
 967                 }
 968
 969                 /* Load full frame. */
 970                 err = ntfs_get_frame_pages(mapping, index, pages,
 971                                            pages_per_frame, &frame_uptodate);
 972                 if (err)
 973                         goto out;
 974
 975                 if (!frame_uptodate) {
 976                         loff_t to = pos + bytes;
 977
 978                         if (off || (to < i_size && (to & (frame_size - 1)))) {
 979                                 err = ni_read_frame(ni, frame_vbo, pages,
 980                                                     pages_per_frame);
 981                                 if (err) {
 982                                         for (ip = 0; ip < pages_per_frame;
 983                                              ip++) {
 984                                                 page = pages[ip];
 985                                                 unlock_page(page);
 986                                                 put_page(page);
 987                                         }
 988                                         goto out;
 989                                 }
 990                         }
 991                 }
 992
 993                 WARN_ON(!bytes);
 994                 copied = 0;
 995                 ip = off >> PAGE_SHIFT;
 996                 off = offset_in_page(pos);
 997
 998                 /* Copy user data to pages. */
 999                 for (;;) {
1000                         size_t cp, tail = PAGE_SIZE - off;
1001
1002                         page = pages[ip];
1003                         cp = copy_page_from_iter_atomic(page, off,
1004                                                         min(tail, bytes), from);
1005                         flush_dcache_page(page);
1006
1007                         copied += cp;
1008                         bytes -= cp;
1009                         if (!bytes || !cp)
1010                                 break;
1011
1012                         if (cp < tail) {
1013                                 off += cp;
1014                         } else {
1015                                 ip++;
1016                                 off = 0;
1017                         }
1018                 }
1019
1020                 ni_lock(ni);
1021                 err = ni_write_frame(ni, pages, pages_per_frame);
1022                 ni_unlock(ni);
1023
1024                 for (ip = 0; ip < pages_per_frame; ip++) {
1025                         page = pages[ip];
1026                         ClearPageDirty(page);
1027                         SetPageUptodate(page);
1028                         unlock_page(page);
1029                         put_page(page);
1030                 }
1031
1032                 if (err)
1033                         goto out;
1034
1035                 /*
1036                  * We can loop for a long time in here. Be nice and allow
1037                  * us to schedule out to avoid softlocking if preempt
1038                  * is disabled.
1039                  */
1040                 cond_resched();
1041
1042                 pos += copied;
1043                 written += copied;
1044
1045                 count = iov_iter_count(from);
1046         }
1047
1048 out:
1049         kfree(pages);
1050
1051         if (err < 0)
1052                 return err;
1053
1054         iocb->ki_pos += written;
1055         if (iocb->ki_pos > ni->i_valid)
1056                 ni->i_valid = iocb->ki_pos;
1057         if (iocb->ki_pos > i_size)
1058                 i_size_write(inode, iocb->ki_pos);
1059
1060         return written;
1061 }
1062
1063 /*
1064  * ntfs_file_write_iter - file_operations::write_iter
1065  */
1066 static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1067 {
1068         struct file *file = iocb->ki_filp;
1069         struct address_space *mapping = file->f_mapping;
1070         struct inode *inode = mapping->host;
1071         ssize_t ret;
1072         int err;
1073         struct ntfs_inode *ni = ntfs_i(inode);
1074
1075         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
1076                 return -EIO;
1077
1078         if (is_encrypted(ni)) {
1079                 ntfs_inode_warn(inode, "encrypted i/o not supported");
1080                 return -EOPNOTSUPP;
1081         }
1082
1083         if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
1084                 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
1085                 return -EOPNOTSUPP;
1086         }
1087
1088         if (is_dedup(ni)) {
1089                 ntfs_inode_warn(inode, "write into deduplicated not supported");
1090                 return -EOPNOTSUPP;
1091         }
1092
1093         if (!inode_trylock(inode)) {
1094                 if (iocb->ki_flags & IOCB_NOWAIT)
1095                         return -EAGAIN;
1096                 inode_lock(inode);
1097         }
1098
1099         ret = generic_write_checks(iocb, from);
1100         if (ret <= 0)
1101                 goto out;
1102
1103         err = file_modified(iocb->ki_filp);
1104         if (err) {
1105                 ret = err;
1106                 goto out;
1107         }
1108
1109         if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
1110                 /* Should never be here, see ntfs_file_open(). */
1111                 ret = -EOPNOTSUPP;
1112                 goto out;
1113         }
1114
1115         ret = ntfs_extend(inode, iocb->ki_pos, ret, file);
1116         if (ret)
1117                 goto out;
1118
1119         ret = is_compressed(ni) ? ntfs_compress_write(iocb, from) :
1120                                   __generic_file_write_iter(iocb, from);
1121
1122 out:
1123         inode_unlock(inode);
1124
1125         if (ret > 0)
1126                 ret = generic_write_sync(iocb, ret);
1127
1128         return ret;
1129 }
1130
1131 /*
1132  * ntfs_file_open - file_operations::open
1133  */
1134 int ntfs_file_open(struct inode *inode, struct file *file)
1135 {
1136         struct ntfs_inode *ni = ntfs_i(inode);
1137
1138         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
1139                 return -EIO;
1140
1141         if (unlikely((is_compressed(ni) || is_encrypted(ni)) &&
1142                      (file->f_flags & O_DIRECT))) {
1143                 return -EOPNOTSUPP;
1144         }
1145
1146         /* Decompress "external compressed" file if opened for rw. */
1147         if ((ni->ni_flags & NI_FLAG_COMPRESSED_MASK) &&
1148             (file->f_flags & (O_WRONLY | O_RDWR | O_TRUNC))) {
1149 #ifdef CONFIG_NTFS3_LZX_XPRESS
1150                 int err = ni_decompress_file(ni);
1151
1152                 if (err)
1153                         return err;
1154 #else
1155                 ntfs_inode_warn(
1156                         inode,
1157                         "activate CONFIG_NTFS3_LZX_XPRESS to write external compressed files");
1158                 return -EOPNOTSUPP;
1159 #endif
1160         }
1161
1162         return generic_file_open(inode, file);
1163 }
1164
1165 /*
1166  * ntfs_file_release - file_operations::release
1167  */
1168 static int ntfs_file_release(struct inode *inode, struct file *file)
1169 {
1170         struct ntfs_inode *ni = ntfs_i(inode);
1171         struct ntfs_sb_info *sbi = ni->mi.sbi;
1172         int err = 0;
1173
1174         /* If we are last writer on the inode, drop the block reservation. */
1175         if (sbi->options->prealloc &&
1176             ((file->f_mode & FMODE_WRITE) &&
1177              atomic_read(&inode->i_writecount) == 1)) {
1178                 ni_lock(ni);
1179                 down_write(&ni->file.run_lock);
1180
1181                 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
1182                                     i_size_read(inode), &ni->i_valid, false,
1183                                     NULL);
1184
1185                 up_write(&ni->file.run_lock);
1186                 ni_unlock(ni);
1187         }
1188         return err;
1189 }
1190
1191 /*
1192  * ntfs_fiemap - file_operations::fiemap
1193  */
1194 int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1195                 __u64 start, __u64 len)
1196 {
1197         int err;
1198         struct ntfs_inode *ni = ntfs_i(inode);
1199
1200         err = fiemap_prep(inode, fieinfo, start, &len, ~FIEMAP_FLAG_XATTR);
1201         if (err)
1202                 return err;
1203
1204         ni_lock(ni);
1205
1206         err = ni_fiemap(ni, fieinfo, start, len);
1207
1208         ni_unlock(ni);
1209
1210         return err;
1211 }
1212
1213 // clang-format off
1214 const struct inode_operations ntfs_file_inode_operations = {
1215         .getattr        = ntfs_getattr,
1216         .setattr        = ntfs3_setattr,
1217         .listxattr      = ntfs_listxattr,
1218         .get_acl        = ntfs_get_acl,
1219         .set_acl        = ntfs_set_acl,
1220         .fiemap         = ntfs_fiemap,
1221 };
1222
1223 const struct file_operations ntfs_file_operations = {
1224         .llseek         = generic_file_llseek,
1225         .read_iter      = ntfs_file_read_iter,
1226         .write_iter     = ntfs_file_write_iter,
1227         .unlocked_ioctl = ntfs_ioctl,
1228 #ifdef CONFIG_COMPAT
1229         .compat_ioctl   = ntfs_compat_ioctl,
1230 #endif
1231         .splice_read    = ntfs_file_splice_read,
1232         .mmap           = ntfs_file_mmap,
1233         .open           = ntfs_file_open,
1234         .fsync          = generic_file_fsync,
1235         .splice_write   = iter_file_splice_write,
1236         .fallocate      = ntfs_fallocate,
1237         .release        = ntfs_file_release,
1238 };
1239 // clang-format on