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         int err;
  26
  27         if (!capable(CAP_SYS_ADMIN))
  28                 return -EPERM;
  29
  30         if (!bdev_max_discard_sectors(sbi->sb->s_bdev))
  31                 return -EOPNOTSUPP;
  32
  33         user_range = (struct fstrim_range __user *)arg;
  34         if (copy_from_user(&range, user_range, sizeof(range)))
  35                 return -EFAULT;
  36
  37         range.minlen = max_t(u32, range.minlen,
  38                              bdev_discard_granularity(sbi->sb->s_bdev));
  39
  40         err = ntfs_trim_fs(sbi, &range);
  41         if (err < 0)
  42                 return err;
  43
  44         if (copy_to_user(user_range, &range, sizeof(range)))
  45                 return -EFAULT;
  46
  47         return 0;
  48 }
  49
  50 static long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg)
  51 {
  52         struct inode *inode = file_inode(filp);
  53         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
  54
  55         switch (cmd) {
  56         case FITRIM:
  57                 return ntfs_ioctl_fitrim(sbi, arg);
  58         }
  59         return -ENOTTY; /* Inappropriate ioctl for device. */
  60 }
  61
  62 #ifdef CONFIG_COMPAT
  63 static long ntfs_compat_ioctl(struct file *filp, u32 cmd, unsigned long arg)
  64
  65 {
  66         return ntfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
  67 }
  68 #endif
  69
  70 /*
  71  * ntfs_getattr - inode_operations::getattr
  72  */
  73 int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
  74                  struct kstat *stat, u32 request_mask, u32 flags)
  75 {
  76         struct inode *inode = d_inode(path->dentry);
  77         struct ntfs_inode *ni = ntfs_i(inode);
  78
  79         if (is_compressed(ni))
  80                 stat->attributes |= STATX_ATTR_COMPRESSED;
  81
  82         if (is_encrypted(ni))
  83                 stat->attributes |= STATX_ATTR_ENCRYPTED;
  84
  85         stat->attributes_mask |= STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED;
  86
  87         generic_fillattr(mnt_userns, inode, stat);
  88
  89         stat->result_mask |= STATX_BTIME;
  90         stat->btime = ni->i_crtime;
  91         stat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */
  92
  93         return 0;
  94 }
  95
  96 static int ntfs_extend_initialized_size(struct file *file,
  97                                         struct ntfs_inode *ni,
  98                                         const loff_t valid,
  99                                         const loff_t new_valid)
 100 {
 101         struct inode *inode = &ni->vfs_inode;
 102         struct address_space *mapping = inode->i_mapping;
 103         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
 104         loff_t pos = valid;
 105         int err;
 106
 107         if (is_resident(ni)) {
 108                 ni->i_valid = new_valid;
 109                 return 0;
 110         }
 111
 112         WARN_ON(is_compressed(ni));
 113         WARN_ON(valid >= new_valid);
 114
 115         for (;;) {
 116                 u32 zerofrom, len;
 117                 struct page *page;
 118                 u8 bits;
 119                 CLST vcn, lcn, clen;
 120
 121                 if (is_sparsed(ni)) {
 122                         bits = sbi->cluster_bits;
 123                         vcn = pos >> bits;
 124
 125                         err = attr_data_get_block(ni, vcn, 0, &lcn, &clen,
 126                                                   NULL);
 127                         if (err)
 128                                 goto out;
 129
 130                         if (lcn == SPARSE_LCN) {
 131                                 loff_t vbo = (loff_t)vcn << bits;
 132                                 loff_t to = vbo + ((loff_t)clen << bits);
 133
 134                                 if (to <= new_valid) {
 135                                         ni->i_valid = to;
 136                                         pos = to;
 137                                         goto next;
 138                                 }
 139
 140                                 if (vbo < pos) {
 141                                         pos = vbo;
 142                                 } else {
 143                                         to = (new_valid >> bits) << bits;
 144                                         if (pos < to) {
 145                                                 ni->i_valid = to;
 146                                                 pos = to;
 147                                                 goto next;
 148                                         }
 149                                 }
 150                         }
 151                 }
 152
 153                 zerofrom = pos & (PAGE_SIZE - 1);
 154                 len = PAGE_SIZE - zerofrom;
 155
 156                 if (pos + len > new_valid)
 157                         len = new_valid - pos;
 158
 159                 err = ntfs_write_begin(file, mapping, pos, len, &page, NULL);
 160                 if (err)
 161                         goto out;
 162
 163                 zero_user_segment(page, zerofrom, PAGE_SIZE);
 164
 165                 /* This function in any case puts page. */
 166                 err = ntfs_write_end(file, mapping, pos, len, len, page, NULL);
 167                 if (err < 0)
 168                         goto out;
 169                 pos += len;
 170
 171 next:
 172                 if (pos >= new_valid)
 173                         break;
 174
 175                 balance_dirty_pages_ratelimited(mapping);
 176                 cond_resched();
 177         }
 178
 179         return 0;
 180
 181 out:
 182         ni->i_valid = valid;
 183         ntfs_inode_warn(inode, "failed to extend initialized size to %llx.",
 184                         new_valid);
 185         return err;
 186 }
 187
 188 /*
 189  * ntfs_zero_range - Helper function for punch_hole.
 190  *
 191  * It zeroes a range [vbo, vbo_to).
 192  */
 193 static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
 194 {
 195         int err = 0;
 196         struct address_space *mapping = inode->i_mapping;
 197         u32 blocksize = 1 << inode->i_blkbits;
 198         pgoff_t idx = vbo >> PAGE_SHIFT;
 199         u32 z_start = vbo & (PAGE_SIZE - 1);
 200         pgoff_t idx_end = (vbo_to + PAGE_SIZE - 1) >> PAGE_SHIFT;
 201         loff_t page_off;
 202         struct buffer_head *head, *bh;
 203         u32 bh_next, bh_off, z_end;
 204         sector_t iblock;
 205         struct page *page;
 206
 207         for (; idx < idx_end; idx += 1, z_start = 0) {
 208                 page_off = (loff_t)idx << PAGE_SHIFT;
 209                 z_end = (page_off + PAGE_SIZE) > vbo_to ? (vbo_to - page_off)
 210                                                         : PAGE_SIZE;
 211                 iblock = page_off >> inode->i_blkbits;
 212
 213                 page = find_or_create_page(mapping, idx,
 214                                            mapping_gfp_constraint(mapping,
 215                                                                   ~__GFP_FS));
 216                 if (!page)
 217                         return -ENOMEM;
 218
 219                 if (!page_has_buffers(page))
 220                         create_empty_buffers(page, blocksize, 0);
 221
 222                 bh = head = page_buffers(page);
 223                 bh_off = 0;
 224                 do {
 225                         bh_next = bh_off + blocksize;
 226
 227                         if (bh_next <= z_start || bh_off >= z_end)
 228                                 continue;
 229
 230                         if (!buffer_mapped(bh)) {
 231                                 ntfs_get_block(inode, iblock, bh, 0);
 232                                 /* Unmapped? It's a hole - nothing to do. */
 233                                 if (!buffer_mapped(bh))
 234                                         continue;
 235                         }
 236
 237                         /* Ok, it's mapped. Make sure it's up-to-date. */
 238                         if (PageUptodate(page))
 239                                 set_buffer_uptodate(bh);
 240
 241                         if (!buffer_uptodate(bh)) {
 242                                 lock_buffer(bh);
 243                                 bh->b_end_io = end_buffer_read_sync;
 244                                 get_bh(bh);
 245                                 submit_bh(REQ_OP_READ, 0, bh);
 246
 247                                 wait_on_buffer(bh);
 248                                 if (!buffer_uptodate(bh)) {
 249                                         unlock_page(page);
 250                                         put_page(page);
 251                                         err = -EIO;
 252                                         goto out;
 253                                 }
 254                         }
 255
 256                         mark_buffer_dirty(bh);
 257
 258                 } while (bh_off = bh_next, iblock += 1,
 259                          head != (bh = bh->b_this_page));
 260
 261                 zero_user_segment(page, z_start, z_end);
 262
 263                 unlock_page(page);
 264                 put_page(page);
 265                 cond_resched();
 266         }
 267 out:
 268         mark_inode_dirty(inode);
 269         return err;
 270 }
 271
 272 /*
 273  * ntfs_sparse_cluster - Helper function to zero a new allocated clusters.
 274  *
 275  * NOTE: 512 <= cluster size <= 2M
 276  */
 277 void ntfs_sparse_cluster(struct inode *inode, struct page *page0, CLST vcn,
 278                          CLST len)
 279 {
 280         struct address_space *mapping = inode->i_mapping;
 281         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
 282         u64 vbo = (u64)vcn << sbi->cluster_bits;
 283         u64 bytes = (u64)len << sbi->cluster_bits;
 284         u32 blocksize = 1 << inode->i_blkbits;
 285         pgoff_t idx0 = page0 ? page0->index : -1;
 286         loff_t vbo_clst = vbo & sbi->cluster_mask_inv;
 287         loff_t end = ntfs_up_cluster(sbi, vbo + bytes);
 288         pgoff_t idx = vbo_clst >> PAGE_SHIFT;
 289         u32 from = vbo_clst & (PAGE_SIZE - 1);
 290         pgoff_t idx_end = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
 291         loff_t page_off;
 292         u32 to;
 293         bool partial;
 294         struct page *page;
 295
 296         for (; idx < idx_end; idx += 1, from = 0) {
 297                 page = idx == idx0 ? page0 : grab_cache_page(mapping, idx);
 298
 299                 if (!page)
 300                         continue;
 301
 302                 page_off = (loff_t)idx << PAGE_SHIFT;
 303                 to = (page_off + PAGE_SIZE) > end ? (end - page_off)
 304                                                   : PAGE_SIZE;
 305                 partial = false;
 306
 307                 if ((from || PAGE_SIZE != to) &&
 308                     likely(!page_has_buffers(page))) {
 309                         create_empty_buffers(page, blocksize, 0);
 310                 }
 311
 312                 if (page_has_buffers(page)) {
 313                         struct buffer_head *head, *bh;
 314                         u32 bh_off = 0;
 315
 316                         bh = head = page_buffers(page);
 317                         do {
 318                                 u32 bh_next = bh_off + blocksize;
 319
 320                                 if (from <= bh_off && bh_next <= to) {
 321                                         set_buffer_uptodate(bh);
 322                                         mark_buffer_dirty(bh);
 323                                 } else if (!buffer_uptodate(bh)) {
 324                                         partial = true;
 325                                 }
 326                                 bh_off = bh_next;
 327                         } while (head != (bh = bh->b_this_page));
 328                 }
 329
 330                 zero_user_segment(page, from, to);
 331
 332                 if (!partial) {
 333                         if (!PageUptodate(page))
 334                                 SetPageUptodate(page);
 335                         set_page_dirty(page);
 336                 }
 337
 338                 if (idx != idx0) {
 339                         unlock_page(page);
 340                         put_page(page);
 341                 }
 342                 cond_resched();
 343         }
 344         mark_inode_dirty(inode);
 345 }
 346
 347 /*
 348  * ntfs_file_mmap - file_operations::mmap
 349  */
 350 static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma)
 351 {
 352         struct address_space *mapping = file->f_mapping;
 353         struct inode *inode = mapping->host;
 354         struct ntfs_inode *ni = ntfs_i(inode);
 355         u64 from = ((u64)vma->vm_pgoff << PAGE_SHIFT);
 356         bool rw = vma->vm_flags & VM_WRITE;
 357         int err;
 358
 359         if (is_encrypted(ni)) {
 360                 ntfs_inode_warn(inode, "mmap encrypted not supported");
 361                 return -EOPNOTSUPP;
 362         }
 363
 364         if (is_dedup(ni)) {
 365                 ntfs_inode_warn(inode, "mmap deduplicated not supported");
 366                 return -EOPNOTSUPP;
 367         }
 368
 369         if (is_compressed(ni) && rw) {
 370                 ntfs_inode_warn(inode, "mmap(write) compressed not supported");
 371                 return -EOPNOTSUPP;
 372         }
 373
 374         if (rw) {
 375                 u64 to = min_t(loff_t, i_size_read(inode),
 376                                from + vma->vm_end - vma->vm_start);
 377
 378                 if (is_sparsed(ni)) {
 379                         /* Allocate clusters for rw map. */
 380                         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
 381                         CLST lcn, len;
 382                         CLST vcn = from >> sbi->cluster_bits;
 383                         CLST end = bytes_to_cluster(sbi, to);
 384                         bool new;
 385
 386                         for (; vcn < end; vcn += len) {
 387                                 err = attr_data_get_block(ni, vcn, 1, &lcn,
 388                                                           &len, &new);
 389                                 if (err)
 390                                         goto out;
 391
 392                                 if (!new)
 393                                         continue;
 394                                 ntfs_sparse_cluster(inode, NULL, vcn, 1);
 395                         }
 396                 }
 397
 398                 if (ni->i_valid < to) {
 399                         if (!inode_trylock(inode)) {
 400                                 err = -EAGAIN;
 401                                 goto out;
 402                         }
 403                         err = ntfs_extend_initialized_size(file, ni,
 404                                                            ni->i_valid, to);
 405                         inode_unlock(inode);
 406                         if (err)
 407                                 goto out;
 408                 }
 409         }
 410
 411         err = generic_file_mmap(file, vma);
 412 out:
 413         return err;
 414 }
 415
 416 static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
 417                        struct file *file)
 418 {
 419         struct ntfs_inode *ni = ntfs_i(inode);
 420         struct address_space *mapping = inode->i_mapping;
 421         loff_t end = pos + count;
 422         bool extend_init = file && pos > ni->i_valid;
 423         int err;
 424
 425         if (end <= inode->i_size && !extend_init)
 426                 return 0;
 427
 428         /* Mark rw ntfs as dirty. It will be cleared at umount. */
 429         ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
 430
 431         if (end > inode->i_size) {
 432                 err = ntfs_set_size(inode, end);
 433                 if (err)
 434                         goto out;
 435                 inode->i_size = end;
 436         }
 437
 438         if (extend_init && !is_compressed(ni)) {
 439                 err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
 440                 if (err)
 441                         goto out;
 442         } else {
 443                 err = 0;
 444         }
 445
 446         inode->i_ctime = inode->i_mtime = current_time(inode);
 447         mark_inode_dirty(inode);
 448
 449         if (IS_SYNC(inode)) {
 450                 int err2;
 451
 452                 err = filemap_fdatawrite_range(mapping, pos, end - 1);
 453                 err2 = sync_mapping_buffers(mapping);
 454                 if (!err)
 455                         err = err2;
 456                 err2 = write_inode_now(inode, 1);
 457                 if (!err)
 458                         err = err2;
 459                 if (!err)
 460                         err = filemap_fdatawait_range(mapping, pos, end - 1);
 461         }
 462
 463 out:
 464         return err;
 465 }
 466
 467 static int ntfs_truncate(struct inode *inode, loff_t new_size)
 468 {
 469         struct super_block *sb = inode->i_sb;
 470         struct ntfs_inode *ni = ntfs_i(inode);
 471         int err, dirty = 0;
 472         u64 new_valid;
 473
 474         if (!S_ISREG(inode->i_mode))
 475                 return 0;
 476
 477         if (is_compressed(ni)) {
 478                 if (ni->i_valid > new_size)
 479                         ni->i_valid = new_size;
 480         } else {
 481                 err = block_truncate_page(inode->i_mapping, new_size,
 482                                           ntfs_get_block);
 483                 if (err)
 484                         return err;
 485         }
 486
 487         new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size));
 488
 489         ni_lock(ni);
 490
 491         truncate_setsize(inode, new_size);
 492
 493         down_write(&ni->file.run_lock);
 494         err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 495                             &new_valid, ni->mi.sbi->options->prealloc, NULL);
 496         up_write(&ni->file.run_lock);
 497
 498         if (new_valid < ni->i_valid)
 499                 ni->i_valid = new_valid;
 500
 501         ni_unlock(ni);
 502
 503         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 504         inode->i_ctime = inode->i_mtime = current_time(inode);
 505         if (!IS_DIRSYNC(inode)) {
 506                 dirty = 1;
 507         } else {
 508                 err = ntfs_sync_inode(inode);
 509                 if (err)
 510                         return err;
 511         }
 512
 513         if (dirty)
 514                 mark_inode_dirty(inode);
 515
 516         /*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/
 517
 518         return 0;
 519 }
 520
 521 /*
 522  * ntfs_fallocate
 523  *
 524  * Preallocate space for a file. This implements ntfs's fallocate file
 525  * operation, which gets called from sys_fallocate system call. User
 526  * space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set
 527  * we just allocate clusters without zeroing them out. Otherwise we
 528  * allocate and zero out clusters via an expanding truncate.
 529  */
 530 static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
 531 {
 532         struct inode *inode = file->f_mapping->host;
 533         struct super_block *sb = inode->i_sb;
 534         struct ntfs_sb_info *sbi = sb->s_fs_info;
 535         struct ntfs_inode *ni = ntfs_i(inode);
 536         loff_t end = vbo + len;
 537         loff_t vbo_down = round_down(vbo, PAGE_SIZE);
 538         loff_t i_size;
 539         int err;
 540
 541         /* No support for dir. */
 542         if (!S_ISREG(inode->i_mode))
 543                 return -EOPNOTSUPP;
 544
 545         /* Return error if mode is not supported. */
 546         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
 547                      FALLOC_FL_COLLAPSE_RANGE)) {
 548                 ntfs_inode_warn(inode, "fallocate(0x%x) is not supported",
 549                                 mode);
 550                 return -EOPNOTSUPP;
 551         }
 552
 553         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
 554
 555         inode_lock(inode);
 556         i_size = inode->i_size;
 557
 558         if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
 559                 /* Should never be here, see ntfs_file_open. */
 560                 err = -EOPNOTSUPP;
 561                 goto out;
 562         }
 563
 564         if (mode & FALLOC_FL_PUNCH_HOLE) {
 565                 u32 frame_size;
 566                 loff_t mask, vbo_a, end_a, tmp;
 567
 568                 if (!(mode & FALLOC_FL_KEEP_SIZE)) {
 569                         err = -EINVAL;
 570                         goto out;
 571                 }
 572
 573                 err = filemap_write_and_wait_range(inode->i_mapping, vbo,
 574                                                    end - 1);
 575                 if (err)
 576                         goto out;
 577
 578                 err = filemap_write_and_wait_range(inode->i_mapping, end,
 579                                                    LLONG_MAX);
 580                 if (err)
 581                         goto out;
 582
 583                 inode_dio_wait(inode);
 584
 585                 truncate_pagecache(inode, vbo_down);
 586
 587                 if (!is_sparsed(ni) && !is_compressed(ni)) {
 588                         /*
 589                          * Normal file, can't make hole.
 590                          * TODO: Try to find way to save info about hole.
 591                          */
 592                         err = -EOPNOTSUPP;
 593                         goto out;
 594                 }
 595
 596                 ni_lock(ni);
 597                 err = attr_punch_hole(ni, vbo, len, &frame_size);
 598                 ni_unlock(ni);
 599                 if (err != E_NTFS_NOTALIGNED)
 600                         goto out;
 601
 602                 /* Process not aligned punch. */
 603                 mask = frame_size - 1;
 604                 vbo_a = (vbo + mask) & ~mask;
 605                 end_a = end & ~mask;
 606
 607                 tmp = min(vbo_a, end);
 608                 if (tmp > vbo) {
 609                         err = ntfs_zero_range(inode, vbo, tmp);
 610                         if (err)
 611                                 goto out;
 612                 }
 613
 614                 if (vbo < end_a && end_a < end) {
 615                         err = ntfs_zero_range(inode, end_a, end);
 616                         if (err)
 617                                 goto out;
 618                 }
 619
 620                 /* Aligned punch_hole */
 621                 if (end_a > vbo_a) {
 622                         ni_lock(ni);
 623                         err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL);
 624                         ni_unlock(ni);
 625                 }
 626         } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
 627                 if (mode & ~FALLOC_FL_COLLAPSE_RANGE) {
 628                         err = -EINVAL;
 629                         goto out;
 630                 }
 631
 632                 /*
 633                  * Write tail of the last page before removed range since
 634                  * it will get removed from the page cache below.
 635                  */
 636                 err = filemap_write_and_wait_range(inode->i_mapping, vbo_down,
 637                                                    vbo);
 638                 if (err)
 639                         goto out;
 640
 641                 /*
 642                  * Write data that will be shifted to preserve them
 643                  * when discarding page cache below.
 644                  */
 645                 err = filemap_write_and_wait_range(inode->i_mapping, end,
 646                                                    LLONG_MAX);
 647                 if (err)
 648                         goto out;
 649
 650                 /* Wait for existing dio to complete. */
 651                 inode_dio_wait(inode);
 652
 653                 truncate_pagecache(inode, vbo_down);
 654
 655                 ni_lock(ni);
 656                 err = attr_collapse_range(ni, vbo, len);
 657                 ni_unlock(ni);
 658         } else {
 659                 /*
 660                  * Normal file: Allocate clusters, do not change 'valid' size.
 661                  */
 662                 loff_t new_size = max(end, i_size);
 663
 664                 err = inode_newsize_ok(inode, new_size);
 665                 if (err)
 666                         goto out;
 667
 668                 err = ntfs_set_size(inode, new_size);
 669                 if (err)
 670                         goto out;
 671
 672                 if (is_sparsed(ni) || is_compressed(ni)) {
 673                         CLST vcn_v = ni->i_valid >> sbi->cluster_bits;
 674                         CLST vcn = vbo >> sbi->cluster_bits;
 675                         CLST cend = bytes_to_cluster(sbi, end);
 676                         CLST lcn, clen;
 677                         bool new;
 678
 679                         /*
 680                          * Allocate but do not zero new clusters. (see below comments)
 681                          * This breaks security: One can read unused on-disk areas.
 682                          * Zeroing these clusters may be too long.
 683                          * Maybe we should check here for root rights?
 684                          */
 685                         for (; vcn < cend; vcn += clen) {
 686                                 err = attr_data_get_block(ni, vcn, cend - vcn,
 687                                                           &lcn, &clen, &new);
 688                                 if (err)
 689                                         goto out;
 690                                 if (!new || vcn >= vcn_v)
 691                                         continue;
 692
 693                                 /*
 694                                  * Unwritten area.
 695                                  * NTFS is not able to store several unwritten areas.
 696                                  * Activate 'ntfs_sparse_cluster' to zero new allocated clusters.
 697                                  *
 698                                  * Dangerous in case:
 699                                  * 1G of sparsed clusters + 1 cluster of data =>
 700                                  * valid_size == 1G + 1 cluster
 701                                  * fallocate(1G) will zero 1G and this can be very long
 702                                  * xfstest 016/086 will fail without 'ntfs_sparse_cluster'.
 703                                  */
 704                                 ntfs_sparse_cluster(inode, NULL, vcn,
 705                                                     min(vcn_v - vcn, clen));
 706                         }
 707                 }
 708
 709                 if (mode & FALLOC_FL_KEEP_SIZE) {
 710                         ni_lock(ni);
 711                         /* True - Keep preallocated. */
 712                         err = attr_set_size(ni, ATTR_DATA, NULL, 0,
 713                                             &ni->file.run, i_size, &ni->i_valid,
 714                                             true, NULL);
 715                         ni_unlock(ni);
 716                 }
 717         }
 718
 719 out:
 720         if (err == -EFBIG)
 721                 err = -ENOSPC;
 722
 723         if (!err) {
 724                 inode->i_ctime = inode->i_mtime = current_time(inode);
 725                 mark_inode_dirty(inode);
 726         }
 727
 728         inode_unlock(inode);
 729         return err;
 730 }
 731
 732 /*
 733  * ntfs3_setattr - inode_operations::setattr
 734  */
 735 int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 736                   struct iattr *attr)
 737 {
 738         struct super_block *sb = dentry->d_sb;
 739         struct ntfs_sb_info *sbi = sb->s_fs_info;
 740         struct inode *inode = d_inode(dentry);
 741         struct ntfs_inode *ni = ntfs_i(inode);
 742         u32 ia_valid = attr->ia_valid;
 743         umode_t mode = inode->i_mode;
 744         int err;
 745
 746         if (sbi->options->noacsrules) {
 747                 /* "No access rules" - Force any changes of time etc. */
 748                 attr->ia_valid |= ATTR_FORCE;
 749                 /* and disable for editing some attributes. */
 750                 attr->ia_valid &= ~(ATTR_UID | ATTR_GID | ATTR_MODE);
 751                 ia_valid = attr->ia_valid;
 752         }
 753
 754         err = setattr_prepare(mnt_userns, dentry, attr);
 755         if (err)
 756                 goto out;
 757
 758         if (ia_valid & ATTR_SIZE) {
 759                 loff_t oldsize = inode->i_size;
 760
 761                 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
 762                         /* Should never be here, see ntfs_file_open(). */
 763                         err = -EOPNOTSUPP;
 764                         goto out;
 765                 }
 766                 inode_dio_wait(inode);
 767
 768                 if (attr->ia_size <= oldsize)
 769                         err = ntfs_truncate(inode, attr->ia_size);
 770                 else if (attr->ia_size > oldsize)
 771                         err = ntfs_extend(inode, attr->ia_size, 0, NULL);
 772
 773                 if (err)
 774                         goto out;
 775
 776                 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
 777         }
 778
 779         setattr_copy(mnt_userns, inode, attr);
 780
 781         if (mode != inode->i_mode) {
 782                 err = ntfs_acl_chmod(mnt_userns, inode);
 783                 if (err)
 784                         goto out;
 785
 786                 /* Linux 'w' -> Windows 'ro'. */
 787                 if (0222 & inode->i_mode)
 788                         ni->std_fa &= ~FILE_ATTRIBUTE_READONLY;
 789                 else
 790                         ni->std_fa |= FILE_ATTRIBUTE_READONLY;
 791         }
 792
 793         if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE))
 794                 ntfs_save_wsl_perm(inode);
 795         mark_inode_dirty(inode);
 796 out:
 797         return err;
 798 }
 799
 800 static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 801 {
 802         struct file *file = iocb->ki_filp;
 803         struct inode *inode = file->f_mapping->host;
 804         struct ntfs_inode *ni = ntfs_i(inode);
 805
 806         if (is_encrypted(ni)) {
 807                 ntfs_inode_warn(inode, "encrypted i/o not supported");
 808                 return -EOPNOTSUPP;
 809         }
 810
 811         if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
 812                 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
 813                 return -EOPNOTSUPP;
 814         }
 815
 816 #ifndef CONFIG_NTFS3_LZX_XPRESS
 817         if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) {
 818                 ntfs_inode_warn(
 819                         inode,
 820                         "activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files");
 821                 return -EOPNOTSUPP;
 822         }
 823 #endif
 824
 825         if (is_dedup(ni)) {
 826                 ntfs_inode_warn(inode, "read deduplicated not supported");
 827                 return -EOPNOTSUPP;
 828         }
 829
 830         return generic_file_read_iter(iocb, iter);
 831 }
 832
 833 /*
 834  * ntfs_get_frame_pages
 835  *
 836  * Return: Array of locked pages.
 837  */
 838 static int ntfs_get_frame_pages(struct address_space *mapping, pgoff_t index,
 839                                 struct page **pages, u32 pages_per_frame,
 840                                 bool *frame_uptodate)
 841 {
 842         gfp_t gfp_mask = mapping_gfp_mask(mapping);
 843         u32 npages;
 844
 845         *frame_uptodate = true;
 846
 847         for (npages = 0; npages < pages_per_frame; npages++, index++) {
 848                 struct page *page;
 849
 850                 page = find_or_create_page(mapping, index, gfp_mask);
 851                 if (!page) {
 852                         while (npages--) {
 853                                 page = pages[npages];
 854                                 unlock_page(page);
 855                                 put_page(page);
 856                         }
 857
 858                         return -ENOMEM;
 859                 }
 860
 861                 if (!PageUptodate(page))
 862                         *frame_uptodate = false;
 863
 864                 pages[npages] = page;
 865         }
 866
 867         return 0;
 868 }
 869
 870 /*
 871  * ntfs_compress_write - Helper for ntfs_file_write_iter() (compressed files).
 872  */
 873 static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
 874 {
 875         int err;
 876         struct file *file = iocb->ki_filp;
 877         size_t count = iov_iter_count(from);
 878         loff_t pos = iocb->ki_pos;
 879         struct inode *inode = file_inode(file);
 880         loff_t i_size = inode->i_size;
 881         struct address_space *mapping = inode->i_mapping;
 882         struct ntfs_inode *ni = ntfs_i(inode);
 883         u64 valid = ni->i_valid;
 884         struct ntfs_sb_info *sbi = ni->mi.sbi;
 885         struct page *page, **pages = NULL;
 886         size_t written = 0;
 887         u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits;
 888         u32 frame_size = 1u << frame_bits;
 889         u32 pages_per_frame = frame_size >> PAGE_SHIFT;
 890         u32 ip, off;
 891         CLST frame;
 892         u64 frame_vbo;
 893         pgoff_t index;
 894         bool frame_uptodate;
 895
 896         if (frame_size < PAGE_SIZE) {
 897                 /*
 898                  * frame_size == 8K if cluster 512
 899                  * frame_size == 64K if cluster 4096
 900                  */
 901                 ntfs_inode_warn(inode, "page size is bigger than frame size");
 902                 return -EOPNOTSUPP;
 903         }
 904
 905         pages = kmalloc_array(pages_per_frame, sizeof(struct page *), GFP_NOFS);
 906         if (!pages)
 907                 return -ENOMEM;
 908
 909         current->backing_dev_info = inode_to_bdi(inode);
 910         err = file_remove_privs(file);
 911         if (err)
 912                 goto out;
 913
 914         err = file_update_time(file);
 915         if (err)
 916                 goto out;
 917
 918         /* Zero range [valid : pos). */
 919         while (valid < pos) {
 920                 CLST lcn, clen;
 921
 922                 frame = valid >> frame_bits;
 923                 frame_vbo = valid & ~(frame_size - 1);
 924                 off = valid & (frame_size - 1);
 925
 926                 err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 0, &lcn,
 927                                           &clen, NULL);
 928                 if (err)
 929                         goto out;
 930
 931                 if (lcn == SPARSE_LCN) {
 932                         ni->i_valid = valid =
 933                                 frame_vbo + ((u64)clen << sbi->cluster_bits);
 934                         continue;
 935                 }
 936
 937                 /* Load full frame. */
 938                 err = ntfs_get_frame_pages(mapping, frame_vbo >> PAGE_SHIFT,
 939                                            pages, pages_per_frame,
 940                                            &frame_uptodate);
 941                 if (err)
 942                         goto out;
 943
 944                 if (!frame_uptodate && off) {
 945                         err = ni_read_frame(ni, frame_vbo, pages,
 946                                             pages_per_frame);
 947                         if (err) {
 948                                 for (ip = 0; ip < pages_per_frame; ip++) {
 949                                         page = pages[ip];
 950                                         unlock_page(page);
 951                                         put_page(page);
 952                                 }
 953                                 goto out;
 954                         }
 955                 }
 956
 957                 ip = off >> PAGE_SHIFT;
 958                 off = offset_in_page(valid);
 959                 for (; ip < pages_per_frame; ip++, off = 0) {
 960                         page = pages[ip];
 961                         zero_user_segment(page, off, PAGE_SIZE);
 962                         flush_dcache_page(page);
 963                         SetPageUptodate(page);
 964                 }
 965
 966                 ni_lock(ni);
 967                 err = ni_write_frame(ni, pages, pages_per_frame);
 968                 ni_unlock(ni);
 969
 970                 for (ip = 0; ip < pages_per_frame; ip++) {
 971                         page = pages[ip];
 972                         SetPageUptodate(page);
 973                         unlock_page(page);
 974                         put_page(page);
 975                 }
 976
 977                 if (err)
 978                         goto out;
 979
 980                 ni->i_valid = valid = frame_vbo + frame_size;
 981         }
 982
 983         /* Copy user data [pos : pos + count). */
 984         while (count) {
 985                 size_t copied, bytes;
 986
 987                 off = pos & (frame_size - 1);
 988                 bytes = frame_size - off;
 989                 if (bytes > count)
 990                         bytes = count;
 991
 992                 frame = pos >> frame_bits;
 993                 frame_vbo = pos & ~(frame_size - 1);
 994                 index = frame_vbo >> PAGE_SHIFT;
 995
 996                 if (unlikely(fault_in_iov_iter_readable(from, bytes))) {
 997                         err = -EFAULT;
 998                         goto out;
 999                 }
1000
1001                 /* Load full frame. */
1002                 err = ntfs_get_frame_pages(mapping, index, pages,
1003                                            pages_per_frame, &frame_uptodate);
1004                 if (err)
1005                         goto out;
1006
1007                 if (!frame_uptodate) {
1008                         loff_t to = pos + bytes;
1009
1010                         if (off || (to < i_size && (to & (frame_size - 1)))) {
1011                                 err = ni_read_frame(ni, frame_vbo, pages,
1012                                                     pages_per_frame);
1013                                 if (err) {
1014                                         for (ip = 0; ip < pages_per_frame;
1015                                              ip++) {
1016                                                 page = pages[ip];
1017                                                 unlock_page(page);
1018                                                 put_page(page);
1019                                         }
1020                                         goto out;
1021                                 }
1022                         }
1023                 }
1024
1025                 WARN_ON(!bytes);
1026                 copied = 0;
1027                 ip = off >> PAGE_SHIFT;
1028                 off = offset_in_page(pos);
1029
1030                 /* Copy user data to pages. */
1031                 for (;;) {
1032                         size_t cp, tail = PAGE_SIZE - off;
1033
1034                         page = pages[ip];
1035                         cp = copy_page_from_iter_atomic(page, off,
1036                                                         min(tail, bytes), from);
1037                         flush_dcache_page(page);
1038
1039                         copied += cp;
1040                         bytes -= cp;
1041                         if (!bytes || !cp)
1042                                 break;
1043
1044                         if (cp < tail) {
1045                                 off += cp;
1046                         } else {
1047                                 ip++;
1048                                 off = 0;
1049                         }
1050                 }
1051
1052                 ni_lock(ni);
1053                 err = ni_write_frame(ni, pages, pages_per_frame);
1054                 ni_unlock(ni);
1055
1056                 for (ip = 0; ip < pages_per_frame; ip++) {
1057                         page = pages[ip];
1058                         ClearPageDirty(page);
1059                         SetPageUptodate(page);
1060                         unlock_page(page);
1061                         put_page(page);
1062                 }
1063
1064                 if (err)
1065                         goto out;
1066
1067                 /*
1068                  * We can loop for a long time in here. Be nice and allow
1069                  * us to schedule out to avoid softlocking if preempt
1070                  * is disabled.
1071                  */
1072                 cond_resched();
1073
1074                 pos += copied;
1075                 written += copied;
1076
1077                 count = iov_iter_count(from);
1078         }
1079
1080 out:
1081         kfree(pages);
1082
1083         current->backing_dev_info = NULL;
1084
1085         if (err < 0)
1086                 return err;
1087
1088         iocb->ki_pos += written;
1089         if (iocb->ki_pos > ni->i_valid)
1090                 ni->i_valid = iocb->ki_pos;
1091
1092         return written;
1093 }
1094
1095 /*
1096  * ntfs_file_write_iter - file_operations::write_iter
1097  */
1098 static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1099 {
1100         struct file *file = iocb->ki_filp;
1101         struct address_space *mapping = file->f_mapping;
1102         struct inode *inode = mapping->host;
1103         ssize_t ret;
1104         struct ntfs_inode *ni = ntfs_i(inode);
1105
1106         if (is_encrypted(ni)) {
1107                 ntfs_inode_warn(inode, "encrypted i/o not supported");
1108                 return -EOPNOTSUPP;
1109         }
1110
1111         if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
1112                 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
1113                 return -EOPNOTSUPP;
1114         }
1115
1116         if (is_dedup(ni)) {
1117                 ntfs_inode_warn(inode, "write into deduplicated not supported");
1118                 return -EOPNOTSUPP;
1119         }
1120
1121         if (!inode_trylock(inode)) {
1122                 if (iocb->ki_flags & IOCB_NOWAIT)
1123                         return -EAGAIN;
1124                 inode_lock(inode);
1125         }
1126
1127         ret = generic_write_checks(iocb, from);
1128         if (ret <= 0)
1129                 goto out;
1130
1131         if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
1132                 /* Should never be here, see ntfs_file_open(). */
1133                 ret = -EOPNOTSUPP;
1134                 goto out;
1135         }
1136
1137         ret = ntfs_extend(inode, iocb->ki_pos, ret, file);
1138         if (ret)
1139                 goto out;
1140
1141         ret = is_compressed(ni) ? ntfs_compress_write(iocb, from)
1142                                 : __generic_file_write_iter(iocb, from);
1143
1144 out:
1145         inode_unlock(inode);
1146
1147         if (ret > 0)
1148                 ret = generic_write_sync(iocb, ret);
1149
1150         return ret;
1151 }
1152
1153 /*
1154  * ntfs_file_open - file_operations::open
1155  */
1156 int ntfs_file_open(struct inode *inode, struct file *file)
1157 {
1158         struct ntfs_inode *ni = ntfs_i(inode);
1159
1160         if (unlikely((is_compressed(ni) || is_encrypted(ni)) &&
1161                      (file->f_flags & O_DIRECT))) {
1162                 return -EOPNOTSUPP;
1163         }
1164
1165         /* Decompress "external compressed" file if opened for rw. */
1166         if ((ni->ni_flags & NI_FLAG_COMPRESSED_MASK) &&
1167             (file->f_flags & (O_WRONLY | O_RDWR | O_TRUNC))) {
1168 #ifdef CONFIG_NTFS3_LZX_XPRESS
1169                 int err = ni_decompress_file(ni);
1170
1171                 if (err)
1172                         return err;
1173 #else
1174                 ntfs_inode_warn(
1175                         inode,
1176                         "activate CONFIG_NTFS3_LZX_XPRESS to write external compressed files");
1177                 return -EOPNOTSUPP;
1178 #endif
1179         }
1180
1181         return generic_file_open(inode, file);
1182 }
1183
1184 /*
1185  * ntfs_file_release - file_operations::release
1186  */
1187 static int ntfs_file_release(struct inode *inode, struct file *file)
1188 {
1189         struct ntfs_inode *ni = ntfs_i(inode);
1190         struct ntfs_sb_info *sbi = ni->mi.sbi;
1191         int err = 0;
1192
1193         /* If we are last writer on the inode, drop the block reservation. */
1194         if (sbi->options->prealloc && ((file->f_mode & FMODE_WRITE) &&
1195                                       atomic_read(&inode->i_writecount) == 1)) {
1196                 ni_lock(ni);
1197                 down_write(&ni->file.run_lock);
1198
1199                 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
1200                                     inode->i_size, &ni->i_valid, false, NULL);
1201
1202                 up_write(&ni->file.run_lock);
1203                 ni_unlock(ni);
1204         }
1205         return err;
1206 }
1207
1208 /*
1209  * ntfs_fiemap - file_operations::fiemap
1210  */
1211 int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1212                 __u64 start, __u64 len)
1213 {
1214         int err;
1215         struct ntfs_inode *ni = ntfs_i(inode);
1216
1217         err = fiemap_prep(inode, fieinfo, start, &len, ~FIEMAP_FLAG_XATTR);
1218         if (err)
1219                 return err;
1220
1221         ni_lock(ni);
1222
1223         err = ni_fiemap(ni, fieinfo, start, len);
1224
1225         ni_unlock(ni);
1226
1227         return err;
1228 }
1229
1230 // clang-format off
1231 const struct inode_operations ntfs_file_inode_operations = {
1232         .getattr        = ntfs_getattr,
1233         .setattr        = ntfs3_setattr,
1234         .listxattr      = ntfs_listxattr,
1235         .permission     = ntfs_permission,
1236         .get_acl        = ntfs_get_acl,
1237         .set_acl        = ntfs_set_acl,
1238         .fiemap         = ntfs_fiemap,
1239 };
1240
1241 const struct file_operations ntfs_file_operations = {
1242         .llseek         = generic_file_llseek,
1243         .read_iter      = ntfs_file_read_iter,
1244         .write_iter     = ntfs_file_write_iter,
1245         .unlocked_ioctl = ntfs_ioctl,
1246 #ifdef CONFIG_COMPAT
1247         .compat_ioctl   = ntfs_compat_ioctl,
1248 #endif
1249         .splice_read    = generic_file_splice_read,
1250         .mmap           = ntfs_file_mmap,
1251         .open           = ntfs_file_open,
1252         .fsync          = generic_file_fsync,
1253         .splice_write   = iter_file_splice_write,
1254         .fallocate      = ntfs_fallocate,
1255         .release        = ntfs_file_release,
1256 };
1257 // clang-format on