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/buffer_head.h>
  12 #include <linux/compat.h>
  13 #include <linux/falloc.h>
  14 #include <linux/fiemap.h>
  15
  16 #include "debug.h"
  17 #include "ntfs.h"
  18 #include "ntfs_fs.h"
  19
  20 static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
  21 {
  22         struct fstrim_range __user *user_range;
  23         struct fstrim_range range;
  24         struct request_queue *q = bdev_get_queue(sbi->sb->s_bdev);
  25         int err;
  26
  27         if (!capable(CAP_SYS_ADMIN))
  28                 return -EPERM;
  29
  30         if (!blk_queue_discard(q))
  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, q->limits.discard_granularity);
  38
  39         err = ntfs_trim_fs(sbi, &range);
  40         if (err < 0)
  41                 return err;
  42
  43         if (copy_to_user(user_range, &range, sizeof(range)))
  44                 return -EFAULT;
  45
  46         return 0;
  47 }
  48
  49 static long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg)
  50 {
  51         struct inode *inode = file_inode(filp);
  52         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
  53
  54         switch (cmd) {
  55         case FITRIM:
  56                 return ntfs_ioctl_fitrim(sbi, arg);
  57         }
  58         return -ENOTTY; /* Inappropriate ioctl for device. */
  59 }
  60
  61 #ifdef CONFIG_COMPAT
  62 static long ntfs_compat_ioctl(struct file *filp, u32 cmd, unsigned long arg)
  63
  64 {
  65         return ntfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
  66 }
  67 #endif
  68
  69 /*
  70  * ntfs_getattr - inode_operations::getattr
  71  */
  72 int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
  73                  struct kstat *stat, u32 request_mask, u32 flags)
  74 {
  75         struct inode *inode = d_inode(path->dentry);
  76         struct ntfs_inode *ni = ntfs_i(inode);
  77
  78         if (is_compressed(ni))
  79                 stat->attributes |= STATX_ATTR_COMPRESSED;
  80
  81         if (is_encrypted(ni))
  82                 stat->attributes |= STATX_ATTR_ENCRYPTED;
  83
  84         stat->attributes_mask |= STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED;
  85
  86         generic_fillattr(mnt_userns, inode, stat);
  87
  88         stat->result_mask |= STATX_BTIME;
  89         stat->btime = ni->i_crtime;
  90         stat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */
  91
  92         return 0;
  93 }
  94
  95 static int ntfs_extend_initialized_size(struct file *file,
  96                                         struct ntfs_inode *ni,
  97                                         const loff_t valid,
  98                                         const loff_t new_valid)
  99 {
 100         struct inode *inode = &ni->vfs_inode;
 101         struct address_space *mapping = inode->i_mapping;
 102         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
 103         loff_t pos = valid;
 104         int err;
 105
 106         if (is_resident(ni)) {
 107                 ni->i_valid = new_valid;
 108                 return 0;
 109         }
 110
 111         WARN_ON(is_compressed(ni));
 112         WARN_ON(valid >= new_valid);
 113
 114         for (;;) {
 115                 u32 zerofrom, len;
 116                 struct page *page;
 117                 void *fsdata;
 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 = pagecache_write_begin(file, mapping, pos, len, 0, &page,
 160                                             &fsdata);
 161                 if (err)
 162                         goto out;
 163
 164                 zero_user_segment(page, zerofrom, PAGE_SIZE);
 165
 166                 /* This function in any case puts page. */
 167                 err = pagecache_write_end(file, mapping, pos, len, len, page,
 168                                           fsdata);
 169                 if (err < 0)
 170                         goto out;
 171                 pos += len;
 172
 173 next:
 174                 if (pos >= new_valid)
 175                         break;
 176
 177                 balance_dirty_pages_ratelimited(mapping);
 178                 cond_resched();
 179         }
 180
 181         return 0;
 182
 183 out:
 184         ni->i_valid = valid;
 185         ntfs_inode_warn(inode, "failed to extend initialized size to %llx.",
 186                         new_valid);
 187         return err;
 188 }
 189
 190 /*
 191  * ntfs_zero_range - Helper function for punch_hole.
 192  *
 193  * It zeroes a range [vbo, vbo_to).
 194  */
 195 static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
 196 {
 197         int err = 0;
 198         struct address_space *mapping = inode->i_mapping;
 199         u32 blocksize = 1 << inode->i_blkbits;
 200         pgoff_t idx = vbo >> PAGE_SHIFT;
 201         u32 z_start = vbo & (PAGE_SIZE - 1);
 202         pgoff_t idx_end = (vbo_to + PAGE_SIZE - 1) >> PAGE_SHIFT;
 203         loff_t page_off;
 204         struct buffer_head *head, *bh;
 205         u32 bh_next, bh_off, z_end;
 206         sector_t iblock;
 207         struct page *page;
 208
 209         for (; idx < idx_end; idx += 1, z_start = 0) {
 210                 page_off = (loff_t)idx << PAGE_SHIFT;
 211                 z_end = (page_off + PAGE_SIZE) > vbo_to ? (vbo_to - page_off)
 212                                                         : PAGE_SIZE;
 213                 iblock = page_off >> inode->i_blkbits;
 214
 215                 page = find_or_create_page(mapping, idx,
 216                                            mapping_gfp_constraint(mapping,
 217                                                                   ~__GFP_FS));
 218                 if (!page)
 219                         return -ENOMEM;
 220
 221                 if (!page_has_buffers(page))
 222                         create_empty_buffers(page, blocksize, 0);
 223
 224                 bh = head = page_buffers(page);
 225                 bh_off = 0;
 226                 do {
 227                         bh_next = bh_off + blocksize;
 228
 229                         if (bh_next <= z_start || bh_off >= z_end)
 230                                 continue;
 231
 232                         if (!buffer_mapped(bh)) {
 233                                 ntfs_get_block(inode, iblock, bh, 0);
 234                                 /* Unmapped? It's a hole - nothing to do. */
 235                                 if (!buffer_mapped(bh))
 236                                         continue;
 237                         }
 238
 239                         /* Ok, it's mapped. Make sure it's up-to-date. */
 240                         if (PageUptodate(page))
 241                                 set_buffer_uptodate(bh);
 242
 243                         if (!buffer_uptodate(bh)) {
 244                                 lock_buffer(bh);
 245                                 bh->b_end_io = end_buffer_read_sync;
 246                                 get_bh(bh);
 247                                 submit_bh(REQ_OP_READ, 0, bh);
 248
 249                                 wait_on_buffer(bh);
 250                                 if (!buffer_uptodate(bh)) {
 251                                         unlock_page(page);
 252                                         put_page(page);
 253                                         err = -EIO;
 254                                         goto out;
 255                                 }
 256                         }
 257
 258                         mark_buffer_dirty(bh);
 259
 260                 } while (bh_off = bh_next, iblock += 1,
 261                          head != (bh = bh->b_this_page));
 262
 263                 zero_user_segment(page, z_start, z_end);
 264
 265                 unlock_page(page);
 266                 put_page(page);
 267                 cond_resched();
 268         }
 269 out:
 270         mark_inode_dirty(inode);
 271         return err;
 272 }
 273
 274 /*
 275  * ntfs_sparse_cluster - Helper function to zero a new allocated clusters.
 276  *
 277  * NOTE: 512 <= cluster size <= 2M
 278  */
 279 void ntfs_sparse_cluster(struct inode *inode, struct page *page0, CLST vcn,
 280                          CLST len)
 281 {
 282         struct address_space *mapping = inode->i_mapping;
 283         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
 284         u64 vbo = (u64)vcn << sbi->cluster_bits;
 285         u64 bytes = (u64)len << sbi->cluster_bits;
 286         u32 blocksize = 1 << inode->i_blkbits;
 287         pgoff_t idx0 = page0 ? page0->index : -1;
 288         loff_t vbo_clst = vbo & sbi->cluster_mask_inv;
 289         loff_t end = ntfs_up_cluster(sbi, vbo + bytes);
 290         pgoff_t idx = vbo_clst >> PAGE_SHIFT;
 291         u32 from = vbo_clst & (PAGE_SIZE - 1);
 292         pgoff_t idx_end = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
 293         loff_t page_off;
 294         u32 to;
 295         bool partial;
 296         struct page *page;
 297
 298         for (; idx < idx_end; idx += 1, from = 0) {
 299                 page = idx == idx0 ? page0 : grab_cache_page(mapping, idx);
 300
 301                 if (!page)
 302                         continue;
 303
 304                 page_off = (loff_t)idx << PAGE_SHIFT;
 305                 to = (page_off + PAGE_SIZE) > end ? (end - page_off)
 306                                                   : PAGE_SIZE;
 307                 partial = false;
 308
 309                 if ((from || PAGE_SIZE != to) &&
 310                     likely(!page_has_buffers(page))) {
 311                         create_empty_buffers(page, blocksize, 0);
 312                 }
 313
 314                 if (page_has_buffers(page)) {
 315                         struct buffer_head *head, *bh;
 316                         u32 bh_off = 0;
 317
 318                         bh = head = page_buffers(page);
 319                         do {
 320                                 u32 bh_next = bh_off + blocksize;
 321
 322                                 if (from <= bh_off && bh_next <= to) {
 323                                         set_buffer_uptodate(bh);
 324                                         mark_buffer_dirty(bh);
 325                                 } else if (!buffer_uptodate(bh)) {
 326                                         partial = true;
 327                                 }
 328                                 bh_off = bh_next;
 329                         } while (head != (bh = bh->b_this_page));
 330                 }
 331
 332                 zero_user_segment(page, from, to);
 333
 334                 if (!partial) {
 335                         if (!PageUptodate(page))
 336                                 SetPageUptodate(page);
 337                         set_page_dirty(page);
 338                 }
 339
 340                 if (idx != idx0) {
 341                         unlock_page(page);
 342                         put_page(page);
 343                 }
 344                 cond_resched();
 345         }
 346         mark_inode_dirty(inode);
 347 }
 348
 349 /*
 350  * ntfs_file_mmap - file_operations::mmap
 351  */
 352 static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma)
 353 {
 354         struct address_space *mapping = file->f_mapping;
 355         struct inode *inode = mapping->host;
 356         struct ntfs_inode *ni = ntfs_i(inode);
 357         u64 from = ((u64)vma->vm_pgoff << PAGE_SHIFT);
 358         bool rw = vma->vm_flags & VM_WRITE;
 359         int err;
 360
 361         if (is_encrypted(ni)) {
 362                 ntfs_inode_warn(inode, "mmap encrypted not supported");
 363                 return -EOPNOTSUPP;
 364         }
 365
 366         if (is_dedup(ni)) {
 367                 ntfs_inode_warn(inode, "mmap deduplicated not supported");
 368                 return -EOPNOTSUPP;
 369         }
 370
 371         if (is_compressed(ni) && rw) {
 372                 ntfs_inode_warn(inode, "mmap(write) compressed not supported");
 373                 return -EOPNOTSUPP;
 374         }
 375
 376         if (rw) {
 377                 u64 to = min_t(loff_t, i_size_read(inode),
 378                                from + vma->vm_end - vma->vm_start);
 379
 380                 if (is_sparsed(ni)) {
 381                         /* Allocate clusters for rw map. */
 382                         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
 383                         CLST lcn, len;
 384                         CLST vcn = from >> sbi->cluster_bits;
 385                         CLST end = bytes_to_cluster(sbi, to);
 386                         bool new;
 387
 388                         for (; vcn < end; vcn += len) {
 389                                 err = attr_data_get_block(ni, vcn, 1, &lcn,
 390                                                           &len, &new);
 391                                 if (err)
 392                                         goto out;
 393
 394                                 if (!new)
 395                                         continue;
 396                                 ntfs_sparse_cluster(inode, NULL, vcn, 1);
 397                         }
 398                 }
 399
 400                 if (ni->i_valid < to) {
 401                         if (!inode_trylock(inode)) {
 402                                 err = -EAGAIN;
 403                                 goto out;
 404                         }
 405                         err = ntfs_extend_initialized_size(file, ni,
 406                                                            ni->i_valid, to);
 407                         inode_unlock(inode);
 408                         if (err)
 409                                 goto out;
 410                 }
 411         }
 412
 413         err = generic_file_mmap(file, vma);
 414 out:
 415         return err;
 416 }
 417
 418 static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
 419                        struct file *file)
 420 {
 421         struct ntfs_inode *ni = ntfs_i(inode);
 422         struct address_space *mapping = inode->i_mapping;
 423         loff_t end = pos + count;
 424         bool extend_init = file && pos > ni->i_valid;
 425         int err;
 426
 427         if (end <= inode->i_size && !extend_init)
 428                 return 0;
 429
 430         /* Mark rw ntfs as dirty. It will be cleared at umount. */
 431         ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
 432
 433         if (end > inode->i_size) {
 434                 err = ntfs_set_size(inode, end);
 435                 if (err)
 436                         goto out;
 437                 inode->i_size = end;
 438         }
 439
 440         if (extend_init && !is_compressed(ni)) {
 441                 err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
 442                 if (err)
 443                         goto out;
 444         } else {
 445                 err = 0;
 446         }
 447
 448         inode->i_ctime = inode->i_mtime = current_time(inode);
 449         mark_inode_dirty(inode);
 450
 451         if (IS_SYNC(inode)) {
 452                 int err2;
 453
 454                 err = filemap_fdatawrite_range(mapping, pos, end - 1);
 455                 err2 = sync_mapping_buffers(mapping);
 456                 if (!err)
 457                         err = err2;
 458                 err2 = write_inode_now(inode, 1);
 459                 if (!err)
 460                         err = err2;
 461                 if (!err)
 462                         err = filemap_fdatawait_range(mapping, pos, end - 1);
 463         }
 464
 465 out:
 466         return err;
 467 }
 468
 469 static int ntfs_truncate(struct inode *inode, loff_t new_size)
 470 {
 471         struct super_block *sb = inode->i_sb;
 472         struct ntfs_inode *ni = ntfs_i(inode);
 473         int err, dirty = 0;
 474         u64 new_valid;
 475
 476         if (!S_ISREG(inode->i_mode))
 477                 return 0;
 478
 479         if (is_compressed(ni)) {
 480                 if (ni->i_valid > new_size)
 481                         ni->i_valid = new_size;
 482         } else {
 483                 err = block_truncate_page(inode->i_mapping, new_size,
 484                                           ntfs_get_block);
 485                 if (err)
 486                         return err;
 487         }
 488
 489         new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size));
 490
 491         ni_lock(ni);
 492
 493         truncate_setsize(inode, new_size);
 494
 495         down_write(&ni->file.run_lock);
 496         err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 497                             &new_valid, true, NULL);
 498         up_write(&ni->file.run_lock);
 499
 500         if (new_valid < ni->i_valid)
 501                 ni->i_valid = new_valid;
 502
 503         ni_unlock(ni);
 504
 505         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 506         inode->i_ctime = inode->i_mtime = current_time(inode);
 507         if (!IS_DIRSYNC(inode)) {
 508                 dirty = 1;
 509         } else {
 510                 err = ntfs_sync_inode(inode);
 511                 if (err)
 512                         return err;
 513         }
 514
 515         if (dirty)
 516                 mark_inode_dirty(inode);
 517
 518         /*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/
 519
 520         return 0;
 521 }
 522
 523 /*
 524  * ntfs_fallocate
 525  *
 526  * Preallocate space for a file. This implements ntfs's fallocate file
 527  * operation, which gets called from sys_fallocate system call. User
 528  * space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set
 529  * we just allocate clusters without zeroing them out. Otherwise we
 530  * allocate and zero out clusters via an expanding truncate.
 531  */
 532 static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
 533 {
 534         struct inode *inode = file->f_mapping->host;
 535         struct super_block *sb = inode->i_sb;
 536         struct ntfs_sb_info *sbi = sb->s_fs_info;
 537         struct ntfs_inode *ni = ntfs_i(inode);
 538         loff_t end = vbo + len;
 539         loff_t vbo_down = round_down(vbo, PAGE_SIZE);
 540         loff_t i_size;
 541         int err;
 542
 543         /* No support for dir. */
 544         if (!S_ISREG(inode->i_mode))
 545                 return -EOPNOTSUPP;
 546
 547         /* Return error if mode is not supported. */
 548         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
 549                      FALLOC_FL_COLLAPSE_RANGE)) {
 550                 ntfs_inode_warn(inode, "fallocate(0x%x) is not supported",
 551                                 mode);
 552                 return -EOPNOTSUPP;
 553         }
 554
 555         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
 556
 557         inode_lock(inode);
 558         i_size = inode->i_size;
 559
 560         if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
 561                 /* Should never be here, see ntfs_file_open. */
 562                 err = -EOPNOTSUPP;
 563                 goto out;
 564         }
 565
 566         if (mode & FALLOC_FL_PUNCH_HOLE) {
 567                 u32 frame_size;
 568                 loff_t mask, vbo_a, end_a, tmp;
 569
 570                 if (!(mode & FALLOC_FL_KEEP_SIZE)) {
 571                         err = -EINVAL;
 572                         goto out;
 573                 }
 574
 575                 err = filemap_write_and_wait_range(inode->i_mapping, vbo,
 576                                                    end - 1);
 577                 if (err)
 578                         goto out;
 579
 580                 err = filemap_write_and_wait_range(inode->i_mapping, end,
 581                                                    LLONG_MAX);
 582                 if (err)
 583                         goto out;
 584
 585                 inode_dio_wait(inode);
 586
 587                 truncate_pagecache(inode, vbo_down);
 588
 589                 if (!is_sparsed(ni) && !is_compressed(ni)) {
 590                         /* Normal file. */
 591                         err = ntfs_zero_range(inode, vbo, end);
 592                         goto out;
 593                 }
 594
 595                 ni_lock(ni);
 596                 err = attr_punch_hole(ni, vbo, len, &frame_size);
 597                 ni_unlock(ni);
 598                 if (err != E_NTFS_NOTALIGNED)
 599                         goto out;
 600
 601                 /* Process not aligned punch. */
 602                 mask = frame_size - 1;
 603                 vbo_a = (vbo + mask) & ~mask;
 604                 end_a = end & ~mask;
 605
 606                 tmp = min(vbo_a, end);
 607                 if (tmp > vbo) {
 608                         err = ntfs_zero_range(inode, vbo, tmp);
 609                         if (err)
 610                                 goto out;
 611                 }
 612
 613                 if (vbo < end_a && end_a < end) {
 614                         err = ntfs_zero_range(inode, end_a, end);
 615                         if (err)
 616                                 goto out;
 617                 }
 618
 619                 /* Aligned punch_hole */
 620                 if (end_a > vbo_a) {
 621                         ni_lock(ni);
 622                         err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL);
 623                         ni_unlock(ni);
 624                 }
 625         } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
 626                 if (mode & ~FALLOC_FL_COLLAPSE_RANGE) {
 627                         err = -EINVAL;
 628                         goto out;
 629                 }
 630
 631                 /*
 632                  * Write tail of the last page before removed range since
 633                  * it will get removed from the page cache below.
 634                  */
 635                 err = filemap_write_and_wait_range(inode->i_mapping, vbo_down,
 636                                                    vbo);
 637                 if (err)
 638                         goto out;
 639
 640                 /*
 641                  * Write data that will be shifted to preserve them
 642                  * when discarding page cache below.
 643                  */
 644                 err = filemap_write_and_wait_range(inode->i_mapping, end,
 645                                                    LLONG_MAX);
 646                 if (err)
 647                         goto out;
 648
 649                 /* Wait for existing dio to complete. */
 650                 inode_dio_wait(inode);
 651
 652                 truncate_pagecache(inode, vbo_down);
 653
 654                 ni_lock(ni);
 655                 err = attr_collapse_range(ni, vbo, len);
 656                 ni_unlock(ni);
 657         } else {
 658                 /*
 659                  * Normal file: Allocate clusters, do not change 'valid' size.
 660                  */
 661                 err = ntfs_set_size(inode, max(end, i_size));
 662                 if (err)
 663                         goto out;
 664
 665                 if (is_sparsed(ni) || is_compressed(ni)) {
 666                         CLST vcn_v = ni->i_valid >> sbi->cluster_bits;
 667                         CLST vcn = vbo >> sbi->cluster_bits;
 668                         CLST cend = bytes_to_cluster(sbi, end);
 669                         CLST lcn, clen;
 670                         bool new;
 671
 672                         /*
 673                          * Allocate but do not zero new clusters. (see below comments)
 674                          * This breaks security: One can read unused on-disk areas.
 675                          * Zeroing these clusters may be too long.
 676                          * Maybe we should check here for root rights?
 677                          */
 678                         for (; vcn < cend; vcn += clen) {
 679                                 err = attr_data_get_block(ni, vcn, cend - vcn,
 680                                                           &lcn, &clen, &new);
 681                                 if (err)
 682                                         goto out;
 683                                 if (!new || vcn >= vcn_v)
 684                                         continue;
 685
 686                                 /*
 687                                  * Unwritten area.
 688                                  * NTFS is not able to store several unwritten areas.
 689                                  * Activate 'ntfs_sparse_cluster' to zero new allocated clusters.
 690                                  *
 691                                  * Dangerous in case:
 692                                  * 1G of sparsed clusters + 1 cluster of data =>
 693                                  * valid_size == 1G + 1 cluster
 694                                  * fallocate(1G) will zero 1G and this can be very long
 695                                  * xfstest 016/086 will fail without 'ntfs_sparse_cluster'.
 696                                  */
 697                                 ntfs_sparse_cluster(inode, NULL, vcn,
 698                                                     min(vcn_v - vcn, clen));
 699                         }
 700                 }
 701
 702                 if (mode & FALLOC_FL_KEEP_SIZE) {
 703                         ni_lock(ni);
 704                         /* True - Keep preallocated. */
 705                         err = attr_set_size(ni, ATTR_DATA, NULL, 0,
 706                                             &ni->file.run, i_size, &ni->i_valid,
 707                                             true, NULL);
 708                         ni_unlock(ni);
 709                 }
 710         }
 711
 712 out:
 713         if (err == -EFBIG)
 714                 err = -ENOSPC;
 715
 716         if (!err) {
 717                 inode->i_ctime = inode->i_mtime = current_time(inode);
 718                 mark_inode_dirty(inode);
 719         }
 720
 721         inode_unlock(inode);
 722         return err;
 723 }
 724
 725 /*
 726  * ntfs3_setattr - inode_operations::setattr
 727  */
 728 int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 729                   struct iattr *attr)
 730 {
 731         struct super_block *sb = dentry->d_sb;
 732         struct ntfs_sb_info *sbi = sb->s_fs_info;
 733         struct inode *inode = d_inode(dentry);
 734         struct ntfs_inode *ni = ntfs_i(inode);
 735         u32 ia_valid = attr->ia_valid;
 736         umode_t mode = inode->i_mode;
 737         int err;
 738
 739         if (sbi->options->noacsrules) {
 740                 /* "No access rules" - Force any changes of time etc. */
 741                 attr->ia_valid |= ATTR_FORCE;
 742                 /* and disable for editing some attributes. */
 743                 attr->ia_valid &= ~(ATTR_UID | ATTR_GID | ATTR_MODE);
 744                 ia_valid = attr->ia_valid;
 745         }
 746
 747         err = setattr_prepare(mnt_userns, dentry, attr);
 748         if (err)
 749                 goto out;
 750
 751         if (ia_valid & ATTR_SIZE) {
 752                 loff_t oldsize = inode->i_size;
 753
 754                 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
 755                         /* Should never be here, see ntfs_file_open(). */
 756                         err = -EOPNOTSUPP;
 757                         goto out;
 758                 }
 759                 inode_dio_wait(inode);
 760
 761                 if (attr->ia_size < oldsize)
 762                         err = ntfs_truncate(inode, attr->ia_size);
 763                 else if (attr->ia_size > oldsize)
 764                         err = ntfs_extend(inode, attr->ia_size, 0, NULL);
 765
 766                 if (err)
 767                         goto out;
 768
 769                 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
 770         }
 771
 772         setattr_copy(mnt_userns, inode, attr);
 773
 774         if (mode != inode->i_mode) {
 775                 err = ntfs_acl_chmod(mnt_userns, inode);
 776                 if (err)
 777                         goto out;
 778
 779                 /* Linux 'w' -> Windows 'ro'. */
 780                 if (0222 & inode->i_mode)
 781                         ni->std_fa &= ~FILE_ATTRIBUTE_READONLY;
 782                 else
 783                         ni->std_fa |= FILE_ATTRIBUTE_READONLY;
 784         }
 785
 786         if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE))
 787                 ntfs_save_wsl_perm(inode);
 788         mark_inode_dirty(inode);
 789 out:
 790         return err;
 791 }
 792
 793 static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 794 {
 795         struct file *file = iocb->ki_filp;
 796         struct inode *inode = file->f_mapping->host;
 797         struct ntfs_inode *ni = ntfs_i(inode);
 798
 799         if (is_encrypted(ni)) {
 800                 ntfs_inode_warn(inode, "encrypted i/o not supported");
 801                 return -EOPNOTSUPP;
 802         }
 803
 804         if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
 805                 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
 806                 return -EOPNOTSUPP;
 807         }
 808
 809 #ifndef CONFIG_NTFS3_LZX_XPRESS
 810         if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) {
 811                 ntfs_inode_warn(
 812                         inode,
 813                         "activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files");
 814                 return -EOPNOTSUPP;
 815         }
 816 #endif
 817
 818         if (is_dedup(ni)) {
 819                 ntfs_inode_warn(inode, "read deduplicated not supported");
 820                 return -EOPNOTSUPP;
 821         }
 822
 823         return generic_file_read_iter(iocb, iter);
 824 }
 825
 826 /*
 827  * ntfs_get_frame_pages
 828  *
 829  * Return: Array of locked pages.
 830  */
 831 static int ntfs_get_frame_pages(struct address_space *mapping, pgoff_t index,
 832                                 struct page **pages, u32 pages_per_frame,
 833                                 bool *frame_uptodate)
 834 {
 835         gfp_t gfp_mask = mapping_gfp_mask(mapping);
 836         u32 npages;
 837
 838         *frame_uptodate = true;
 839
 840         for (npages = 0; npages < pages_per_frame; npages++, index++) {
 841                 struct page *page;
 842
 843                 page = find_or_create_page(mapping, index, gfp_mask);
 844                 if (!page) {
 845                         while (npages--) {
 846                                 page = pages[npages];
 847                                 unlock_page(page);
 848                                 put_page(page);
 849                         }
 850
 851                         return -ENOMEM;
 852                 }
 853
 854                 if (!PageUptodate(page))
 855                         *frame_uptodate = false;
 856
 857                 pages[npages] = page;
 858         }
 859
 860         return 0;
 861 }
 862
 863 /*
 864  * ntfs_compress_write - Helper for ntfs_file_write_iter() (compressed files).
 865  */
 866 static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
 867 {
 868         int err;
 869         struct file *file = iocb->ki_filp;
 870         size_t count = iov_iter_count(from);
 871         loff_t pos = iocb->ki_pos;
 872         struct inode *inode = file_inode(file);
 873         loff_t i_size = inode->i_size;
 874         struct address_space *mapping = inode->i_mapping;
 875         struct ntfs_inode *ni = ntfs_i(inode);
 876         u64 valid = ni->i_valid;
 877         struct ntfs_sb_info *sbi = ni->mi.sbi;
 878         struct page *page, **pages = NULL;
 879         size_t written = 0;
 880         u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits;
 881         u32 frame_size = 1u << frame_bits;
 882         u32 pages_per_frame = frame_size >> PAGE_SHIFT;
 883         u32 ip, off;
 884         CLST frame;
 885         u64 frame_vbo;
 886         pgoff_t index;
 887         bool frame_uptodate;
 888
 889         if (frame_size < PAGE_SIZE) {
 890                 /*
 891                  * frame_size == 8K if cluster 512
 892                  * frame_size == 64K if cluster 4096
 893                  */
 894                 ntfs_inode_warn(inode, "page size is bigger than frame size");
 895                 return -EOPNOTSUPP;
 896         }
 897
 898         pages = kmalloc_array(pages_per_frame, sizeof(struct page *), GFP_NOFS);
 899         if (!pages)
 900                 return -ENOMEM;
 901
 902         current->backing_dev_info = inode_to_bdi(inode);
 903         err = file_remove_privs(file);
 904         if (err)
 905                 goto out;
 906
 907         err = file_update_time(file);
 908         if (err)
 909                 goto out;
 910
 911         /* Zero range [valid : pos). */
 912         while (valid < pos) {
 913                 CLST lcn, clen;
 914
 915                 frame = valid >> frame_bits;
 916                 frame_vbo = valid & ~(frame_size - 1);
 917                 off = valid & (frame_size - 1);
 918
 919                 err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 0, &lcn,
 920                                           &clen, NULL);
 921                 if (err)
 922                         goto out;
 923
 924                 if (lcn == SPARSE_LCN) {
 925                         ni->i_valid = valid =
 926                                 frame_vbo + ((u64)clen << sbi->cluster_bits);
 927                         continue;
 928                 }
 929
 930                 /* Load full frame. */
 931                 err = ntfs_get_frame_pages(mapping, frame_vbo >> PAGE_SHIFT,
 932                                            pages, pages_per_frame,
 933                                            &frame_uptodate);
 934                 if (err)
 935                         goto out;
 936
 937                 if (!frame_uptodate && off) {
 938                         err = ni_read_frame(ni, frame_vbo, pages,
 939                                             pages_per_frame);
 940                         if (err) {
 941                                 for (ip = 0; ip < pages_per_frame; ip++) {
 942                                         page = pages[ip];
 943                                         unlock_page(page);
 944                                         put_page(page);
 945                                 }
 946                                 goto out;
 947                         }
 948                 }
 949
 950                 ip = off >> PAGE_SHIFT;
 951                 off = offset_in_page(valid);
 952                 for (; ip < pages_per_frame; ip++, off = 0) {
 953                         page = pages[ip];
 954                         zero_user_segment(page, off, PAGE_SIZE);
 955                         flush_dcache_page(page);
 956                         SetPageUptodate(page);
 957                 }
 958
 959                 ni_lock(ni);
 960                 err = ni_write_frame(ni, pages, pages_per_frame);
 961                 ni_unlock(ni);
 962
 963                 for (ip = 0; ip < pages_per_frame; ip++) {
 964                         page = pages[ip];
 965                         SetPageUptodate(page);
 966                         unlock_page(page);
 967                         put_page(page);
 968                 }
 969
 970                 if (err)
 971                         goto out;
 972
 973                 ni->i_valid = valid = frame_vbo + frame_size;
 974         }
 975
 976         /* Copy user data [pos : pos + count). */
 977         while (count) {
 978                 size_t copied, bytes;
 979
 980                 off = pos & (frame_size - 1);
 981                 bytes = frame_size - off;
 982                 if (bytes > count)
 983                         bytes = count;
 984
 985                 frame = pos >> frame_bits;
 986                 frame_vbo = pos & ~(frame_size - 1);
 987                 index = frame_vbo >> PAGE_SHIFT;
 988
 989                 if (unlikely(iov_iter_fault_in_readable(from, bytes))) {
 990                         err = -EFAULT;
 991                         goto out;
 992                 }
 993
 994                 /* Load full frame. */
 995                 err = ntfs_get_frame_pages(mapping, index, pages,
 996                                            pages_per_frame, &frame_uptodate);
 997                 if (err)
 998                         goto out;
 999
1000                 if (!frame_uptodate) {
1001                         loff_t to = pos + bytes;
1002
1003                         if (off || (to < i_size && (to & (frame_size - 1)))) {
1004                                 err = ni_read_frame(ni, frame_vbo, pages,
1005                                                     pages_per_frame);
1006                                 if (err) {
1007                                         for (ip = 0; ip < pages_per_frame;
1008                                              ip++) {
1009                                                 page = pages[ip];
1010                                                 unlock_page(page);
1011                                                 put_page(page);
1012                                         }
1013                                         goto out;
1014                                 }
1015                         }
1016                 }
1017
1018                 WARN_ON(!bytes);
1019                 copied = 0;
1020                 ip = off >> PAGE_SHIFT;
1021                 off = offset_in_page(pos);
1022
1023                 /* Copy user data to pages. */
1024                 for (;;) {
1025                         size_t cp, tail = PAGE_SIZE - off;
1026
1027                         page = pages[ip];
1028                         cp = copy_page_from_iter_atomic(page, off,
1029                                                         min(tail, bytes), from);
1030                         flush_dcache_page(page);
1031
1032                         copied += cp;
1033                         bytes -= cp;
1034                         if (!bytes || !cp)
1035                                 break;
1036
1037                         if (cp < tail) {
1038                                 off += cp;
1039                         } else {
1040                                 ip++;
1041                                 off = 0;
1042                         }
1043                 }
1044
1045                 ni_lock(ni);
1046                 err = ni_write_frame(ni, pages, pages_per_frame);
1047                 ni_unlock(ni);
1048
1049                 for (ip = 0; ip < pages_per_frame; ip++) {
1050                         page = pages[ip];
1051                         ClearPageDirty(page);
1052                         SetPageUptodate(page);
1053                         unlock_page(page);
1054                         put_page(page);
1055                 }
1056
1057                 if (err)
1058                         goto out;
1059
1060                 /*
1061                  * We can loop for a long time in here. Be nice and allow
1062                  * us to schedule out to avoid softlocking if preempt
1063                  * is disabled.
1064                  */
1065                 cond_resched();
1066
1067                 pos += copied;
1068                 written += copied;
1069
1070                 count = iov_iter_count(from);
1071         }
1072
1073 out:
1074         kfree(pages);
1075
1076         current->backing_dev_info = NULL;
1077
1078         if (err < 0)
1079                 return err;
1080
1081         iocb->ki_pos += written;
1082         if (iocb->ki_pos > ni->i_valid)
1083                 ni->i_valid = iocb->ki_pos;
1084
1085         return written;
1086 }
1087
1088 /*
1089  * ntfs_file_write_iter - file_operations::write_iter
1090  */
1091 static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1092 {
1093         struct file *file = iocb->ki_filp;
1094         struct address_space *mapping = file->f_mapping;
1095         struct inode *inode = mapping->host;
1096         ssize_t ret;
1097         struct ntfs_inode *ni = ntfs_i(inode);
1098
1099         if (is_encrypted(ni)) {
1100                 ntfs_inode_warn(inode, "encrypted i/o not supported");
1101                 return -EOPNOTSUPP;
1102         }
1103
1104         if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
1105                 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
1106                 return -EOPNOTSUPP;
1107         }
1108
1109         if (is_dedup(ni)) {
1110                 ntfs_inode_warn(inode, "write into deduplicated not supported");
1111                 return -EOPNOTSUPP;
1112         }
1113
1114         if (!inode_trylock(inode)) {
1115                 if (iocb->ki_flags & IOCB_NOWAIT)
1116                         return -EAGAIN;
1117                 inode_lock(inode);
1118         }
1119
1120         ret = generic_write_checks(iocb, from);
1121         if (ret <= 0)
1122                 goto out;
1123
1124         if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
1125                 /* Should never be here, see ntfs_file_open(). */
1126                 ret = -EOPNOTSUPP;
1127                 goto out;
1128         }
1129
1130         ret = ntfs_extend(inode, iocb->ki_pos, ret, file);
1131         if (ret)
1132                 goto out;
1133
1134         ret = is_compressed(ni) ? ntfs_compress_write(iocb, from)
1135                                 : __generic_file_write_iter(iocb, from);
1136
1137 out:
1138         inode_unlock(inode);
1139
1140         if (ret > 0)
1141                 ret = generic_write_sync(iocb, ret);
1142
1143         return ret;
1144 }
1145
1146 /*
1147  * ntfs_file_open - file_operations::open
1148  */
1149 int ntfs_file_open(struct inode *inode, struct file *file)
1150 {
1151         struct ntfs_inode *ni = ntfs_i(inode);
1152
1153         if (unlikely((is_compressed(ni) || is_encrypted(ni)) &&
1154                      (file->f_flags & O_DIRECT))) {
1155                 return -EOPNOTSUPP;
1156         }
1157
1158         /* Decompress "external compressed" file if opened for rw. */
1159         if ((ni->ni_flags & NI_FLAG_COMPRESSED_MASK) &&
1160             (file->f_flags & (O_WRONLY | O_RDWR | O_TRUNC))) {
1161 #ifdef CONFIG_NTFS3_LZX_XPRESS
1162                 int err = ni_decompress_file(ni);
1163
1164                 if (err)
1165                         return err;
1166 #else
1167                 ntfs_inode_warn(
1168                         inode,
1169                         "activate CONFIG_NTFS3_LZX_XPRESS to write external compressed files");
1170                 return -EOPNOTSUPP;
1171 #endif
1172         }
1173
1174         return generic_file_open(inode, file);
1175 }
1176
1177 /*
1178  * ntfs_file_release - file_operations::release
1179  */
1180 static int ntfs_file_release(struct inode *inode, struct file *file)
1181 {
1182         struct ntfs_inode *ni = ntfs_i(inode);
1183         struct ntfs_sb_info *sbi = ni->mi.sbi;
1184         int err = 0;
1185
1186         /* If we are last writer on the inode, drop the block reservation. */
1187         if (sbi->options->prealloc && ((file->f_mode & FMODE_WRITE) &&
1188                                       atomic_read(&inode->i_writecount) == 1)) {
1189                 ni_lock(ni);
1190                 down_write(&ni->file.run_lock);
1191
1192                 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
1193                                     inode->i_size, &ni->i_valid, false, NULL);
1194
1195                 up_write(&ni->file.run_lock);
1196                 ni_unlock(ni);
1197         }
1198         return err;
1199 }
1200
1201 /*
1202  * ntfs_fiemap - file_operations::fiemap
1203  */
1204 int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1205                 __u64 start, __u64 len)
1206 {
1207         int err;
1208         struct ntfs_inode *ni = ntfs_i(inode);
1209
1210         err = fiemap_prep(inode, fieinfo, start, &len, ~FIEMAP_FLAG_XATTR);
1211         if (err)
1212                 return err;
1213
1214         ni_lock(ni);
1215
1216         err = ni_fiemap(ni, fieinfo, start, len);
1217
1218         ni_unlock(ni);
1219
1220         return err;
1221 }
1222
1223 // clang-format off
1224 const struct inode_operations ntfs_file_inode_operations = {
1225         .getattr        = ntfs_getattr,
1226         .setattr        = ntfs3_setattr,
1227         .listxattr      = ntfs_listxattr,
1228         .permission     = ntfs_permission,
1229         .get_acl        = ntfs_get_acl,
1230         .set_acl        = ntfs_set_acl,
1231         .fiemap         = ntfs_fiemap,
1232 };
1233
1234 const struct file_operations ntfs_file_operations = {
1235         .llseek         = generic_file_llseek,
1236         .read_iter      = ntfs_file_read_iter,
1237         .write_iter     = ntfs_file_write_iter,
1238         .unlocked_ioctl = ntfs_ioctl,
1239 #ifdef CONFIG_COMPAT
1240         .compat_ioctl   = ntfs_compat_ioctl,
1241 #endif
1242         .splice_read    = generic_file_splice_read,
1243         .mmap           = ntfs_file_mmap,
1244         .open           = ntfs_file_open,
1245         .fsync          = generic_file_fsync,
1246         .splice_write   = iter_file_splice_write,
1247         .fallocate      = ntfs_fallocate,
1248         .release        = ntfs_file_release,
1249 };
1250 // clang-format on