fs/ntfs3/file.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *
   4  * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
   5  *
   6  *  Regular file handling primitives for NTFS-based filesystems.
   7  *
   8  */
   9
  10 #include <linux/backing-dev.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/buffer_head.h>
  13 #include <linux/compat.h>
  14 #include <linux/falloc.h>
  15 #include <linux/fiemap.h>
  16
  17 #include "debug.h"
  18 #include "ntfs.h"
  19 #include "ntfs_fs.h"
  20
  21 static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
  22 {
  23         struct fstrim_range __user *user_range;
  24         struct fstrim_range range;
  25         struct request_queue *q = bdev_get_queue(sbi->sb->s_bdev);
  26         int err;
  27
  28         if (!capable(CAP_SYS_ADMIN))
  29                 return -EPERM;
  30
  31         if (!blk_queue_discard(q))
  32                 return -EOPNOTSUPP;
  33
  34         user_range = (struct fstrim_range __user *)arg;
  35         if (copy_from_user(&range, user_range, sizeof(range)))
  36                 return -EFAULT;
  37
  38         range.minlen = max_t(u32, range.minlen, q->limits.discard_granularity);
  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                 void *fsdata;
 119                 u8 bits;
 120                 CLST vcn, lcn, clen;
 121
 122                 if (is_sparsed(ni)) {
 123                         bits = sbi->cluster_bits;
 124                         vcn = pos >> bits;
 125
 126                         err = attr_data_get_block(ni, vcn, 0, &lcn, &clen,
 127                                                   NULL);
 128                         if (err)
 129                                 goto out;
 130
 131                         if (lcn == SPARSE_LCN) {
 132                                 loff_t vbo = (loff_t)vcn << bits;
 133                                 loff_t to = vbo + ((loff_t)clen << bits);
 134
 135                                 if (to <= new_valid) {
 136                                         ni->i_valid = to;
 137                                         pos = to;
 138                                         goto next;
 139                                 }
 140
 141                                 if (vbo < pos) {
 142                                         pos = vbo;
 143                                 } else {
 144                                         to = (new_valid >> bits) << bits;
 145                                         if (pos < to) {
 146                                                 ni->i_valid = to;
 147                                                 pos = to;
 148                                                 goto next;
 149                                         }
 150                                 }
 151                         }
 152                 }
 153
 154                 zerofrom = pos & (PAGE_SIZE - 1);
 155                 len = PAGE_SIZE - zerofrom;
 156
 157                 if (pos + len > new_valid)
 158                         len = new_valid - pos;
 159
 160                 err = pagecache_write_begin(file, mapping, pos, len, 0, &page,
 161                                             &fsdata);
 162                 if (err)
 163                         goto out;
 164
 165                 zero_user_segment(page, zerofrom, PAGE_SIZE);
 166
 167                 /* This function in any case puts page. */
 168                 err = pagecache_write_end(file, mapping, pos, len, len, page,
 169                                           fsdata);
 170                 if (err < 0)
 171                         goto out;
 172                 pos += len;
 173
 174 next:
 175                 if (pos >= new_valid)
 176                         break;
 177
 178                 balance_dirty_pages_ratelimited(mapping);
 179                 cond_resched();
 180         }
 181
 182         return 0;
 183
 184 out:
 185         ni->i_valid = valid;
 186         ntfs_inode_warn(inode, "failed to extend initialized size to %llx.",
 187                         new_valid);
 188         return err;
 189 }
 190
 191 /*
 192  * ntfs_zero_range - Helper function for punch_hole.
 193  *
 194  * It zeroes a range [vbo, vbo_to).
 195  */
 196 static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
 197 {
 198         int err = 0;
 199         struct address_space *mapping = inode->i_mapping;
 200         u32 blocksize = 1 << inode->i_blkbits;
 201         pgoff_t idx = vbo >> PAGE_SHIFT;
 202         u32 z_start = vbo & (PAGE_SIZE - 1);
 203         pgoff_t idx_end = (vbo_to + PAGE_SIZE - 1) >> PAGE_SHIFT;
 204         loff_t page_off;
 205         struct buffer_head *head, *bh;
 206         u32 bh_next, bh_off, z_end;
 207         sector_t iblock;
 208         struct page *page;
 209
 210         for (; idx < idx_end; idx += 1, z_start = 0) {
 211                 page_off = (loff_t)idx << PAGE_SHIFT;
 212                 z_end = (page_off + PAGE_SIZE) > vbo_to ? (vbo_to - page_off)
 213                                                         : PAGE_SIZE;
 214                 iblock = page_off >> inode->i_blkbits;
 215
 216                 page = find_or_create_page(mapping, idx,
 217                                            mapping_gfp_constraint(mapping,
 218                                                                   ~__GFP_FS));
 219                 if (!page)
 220                         return -ENOMEM;
 221
 222                 if (!page_has_buffers(page))
 223                         create_empty_buffers(page, blocksize, 0);
 224
 225                 bh = head = page_buffers(page);
 226                 bh_off = 0;
 227                 do {
 228                         bh_next = bh_off + blocksize;
 229
 230                         if (bh_next <= z_start || bh_off >= z_end)
 231                                 continue;
 232
 233                         if (!buffer_mapped(bh)) {
 234                                 ntfs_get_block(inode, iblock, bh, 0);
 235                                 /* Unmapped? It's a hole - nothing to do. */
 236                                 if (!buffer_mapped(bh))
 237                                         continue;
 238                         }
 239
 240                         /* Ok, it's mapped. Make sure it's up-to-date. */
 241                         if (PageUptodate(page))
 242                                 set_buffer_uptodate(bh);
 243
 244                         if (!buffer_uptodate(bh)) {
 245                                 lock_buffer(bh);
 246                                 bh->b_end_io = end_buffer_read_sync;
 247                                 get_bh(bh);
 248                                 submit_bh(REQ_OP_READ, 0, bh);
 249
 250                                 wait_on_buffer(bh);
 251                                 if (!buffer_uptodate(bh)) {
 252                                         unlock_page(page);
 253                                         put_page(page);
 254                                         err = -EIO;
 255                                         goto out;
 256                                 }
 257                         }
 258
 259                         mark_buffer_dirty(bh);
 260
 261                 } while (bh_off = bh_next, iblock += 1,
 262                          head != (bh = bh->b_this_page));
 263
 264                 zero_user_segment(page, z_start, z_end);
 265
 266                 unlock_page(page);
 267                 put_page(page);
 268                 cond_resched();
 269         }
 270 out:
 271         mark_inode_dirty(inode);
 272         return err;
 273 }
 274
 275 /*
 276  * ntfs_sparse_cluster - Helper function to zero a new allocated clusters.
 277  *
 278  * NOTE: 512 <= cluster size <= 2M
 279  */
 280 void ntfs_sparse_cluster(struct inode *inode, struct page *page0, CLST vcn,
 281                          CLST len)
 282 {
 283         struct address_space *mapping = inode->i_mapping;
 284         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
 285         u64 vbo = (u64)vcn << sbi->cluster_bits;
 286         u64 bytes = (u64)len << sbi->cluster_bits;
 287         u32 blocksize = 1 << inode->i_blkbits;
 288         pgoff_t idx0 = page0 ? page0->index : -1;
 289         loff_t vbo_clst = vbo & sbi->cluster_mask_inv;
 290         loff_t end = ntfs_up_cluster(sbi, vbo + bytes);
 291         pgoff_t idx = vbo_clst >> PAGE_SHIFT;
 292         u32 from = vbo_clst & (PAGE_SIZE - 1);
 293         pgoff_t idx_end = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
 294         loff_t page_off;
 295         u32 to;
 296         bool partial;
 297         struct page *page;
 298
 299         for (; idx < idx_end; idx += 1, from = 0) {
 300                 page = idx == idx0 ? page0 : grab_cache_page(mapping, idx);
 301
 302                 if (!page)
 303                         continue;
 304
 305                 page_off = (loff_t)idx << PAGE_SHIFT;
 306                 to = (page_off + PAGE_SIZE) > end ? (end - page_off)
 307                                                   : PAGE_SIZE;
 308                 partial = false;
 309
 310                 if ((from || PAGE_SIZE != to) &&
 311                     likely(!page_has_buffers(page))) {
 312                         create_empty_buffers(page, blocksize, 0);
 313                 }
 314
 315                 if (page_has_buffers(page)) {
 316                         struct buffer_head *head, *bh;
 317                         u32 bh_off = 0;
 318
 319                         bh = head = page_buffers(page);
 320                         do {
 321                                 u32 bh_next = bh_off + blocksize;
 322
 323                                 if (from <= bh_off && bh_next <= to) {
 324                                         set_buffer_uptodate(bh);
 325                                         mark_buffer_dirty(bh);
 326                                 } else if (!buffer_uptodate(bh)) {
 327                                         partial = true;
 328                                 }
 329                                 bh_off = bh_next;
 330                         } while (head != (bh = bh->b_this_page));
 331                 }
 332
 333                 zero_user_segment(page, from, to);
 334
 335                 if (!partial) {
 336                         if (!PageUptodate(page))
 337                                 SetPageUptodate(page);
 338                         set_page_dirty(page);
 339                 }
 340
 341                 if (idx != idx0) {
 342                         unlock_page(page);
 343                         put_page(page);
 344                 }
 345                 cond_resched();
 346         }
 347         mark_inode_dirty(inode);
 348 }
 349
 350 /*
 351  * ntfs_file_mmap - file_operations::mmap
 352  */
 353 static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma)
 354 {
 355         struct address_space *mapping = file->f_mapping;
 356         struct inode *inode = mapping->host;
 357         struct ntfs_inode *ni = ntfs_i(inode);
 358         u64 from = ((u64)vma->vm_pgoff << PAGE_SHIFT);
 359         bool rw = vma->vm_flags & VM_WRITE;
 360         int err;
 361
 362         if (is_encrypted(ni)) {
 363                 ntfs_inode_warn(inode, "mmap encrypted not supported");
 364                 return -EOPNOTSUPP;
 365         }
 366
 367         if (is_dedup(ni)) {
 368                 ntfs_inode_warn(inode, "mmap deduplicated not supported");
 369                 return -EOPNOTSUPP;
 370         }
 371
 372         if (is_compressed(ni) && rw) {
 373                 ntfs_inode_warn(inode, "mmap(write) compressed not supported");
 374                 return -EOPNOTSUPP;
 375         }
 376
 377         if (rw) {
 378                 u64 to = min_t(loff_t, i_size_read(inode),
 379                                from + vma->vm_end - vma->vm_start);
 380
 381                 if (is_sparsed(ni)) {
 382                         /* Allocate clusters for rw map. */
 383                         struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
 384                         CLST lcn, len;
 385                         CLST vcn = from >> sbi->cluster_bits;
 386                         CLST end = bytes_to_cluster(sbi, to);
 387                         bool new;
 388
 389                         for (; vcn < end; vcn += len) {
 390                                 err = attr_data_get_block(ni, vcn, 1, &lcn,
 391                                                           &len, &new);
 392                                 if (err)
 393                                         goto out;
 394
 395                                 if (!new)
 396                                         continue;
 397                                 ntfs_sparse_cluster(inode, NULL, vcn, 1);
 398                         }
 399                 }
 400
 401                 if (ni->i_valid < to) {
 402                         if (!inode_trylock(inode)) {
 403                                 err = -EAGAIN;
 404                                 goto out;
 405                         }
 406                         err = ntfs_extend_initialized_size(file, ni,
 407                                                            ni->i_valid, to);
 408                         inode_unlock(inode);
 409                         if (err)
 410                                 goto out;
 411                 }
 412         }
 413
 414         err = generic_file_mmap(file, vma);
 415 out:
 416         return err;
 417 }
 418
 419 static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
 420                        struct file *file)
 421 {
 422         struct ntfs_inode *ni = ntfs_i(inode);
 423         struct address_space *mapping = inode->i_mapping;
 424         loff_t end = pos + count;
 425         bool extend_init = file && pos > ni->i_valid;
 426         int err;
 427
 428         if (end <= inode->i_size && !extend_init)
 429                 return 0;
 430
 431         /* Mark rw ntfs as dirty. It will be cleared at umount. */
 432         ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
 433
 434         if (end > inode->i_size) {
 435                 err = ntfs_set_size(inode, end);
 436                 if (err)
 437                         goto out;
 438                 inode->i_size = end;
 439         }
 440
 441         if (extend_init && !is_compressed(ni)) {
 442                 err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
 443                 if (err)
 444                         goto out;
 445         } else {
 446                 err = 0;
 447         }
 448
 449         inode->i_ctime = inode->i_mtime = current_time(inode);
 450         mark_inode_dirty(inode);
 451
 452         if (IS_SYNC(inode)) {
 453                 int err2;
 454
 455                 err = filemap_fdatawrite_range(mapping, pos, end - 1);
 456                 err2 = sync_mapping_buffers(mapping);
 457                 if (!err)
 458                         err = err2;
 459                 err2 = write_inode_now(inode, 1);
 460                 if (!err)
 461                         err = err2;
 462                 if (!err)
 463                         err = filemap_fdatawait_range(mapping, pos, end - 1);
 464         }
 465
 466 out:
 467         return err;
 468 }
 469
 470 static int ntfs_truncate(struct inode *inode, loff_t new_size)
 471 {
 472         struct super_block *sb = inode->i_sb;
 473         struct ntfs_inode *ni = ntfs_i(inode);
 474         int err, dirty = 0;
 475         u64 new_valid;
 476
 477         if (!S_ISREG(inode->i_mode))
 478                 return 0;
 479
 480         if (is_compressed(ni)) {
 481                 if (ni->i_valid > new_size)
 482                         ni->i_valid = new_size;
 483         } else {
 484                 err = block_truncate_page(inode->i_mapping, new_size,
 485                                           ntfs_get_block);
 486                 if (err)
 487                         return err;
 488         }
 489
 490         new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size));
 491
 492         ni_lock(ni);
 493
 494         truncate_setsize(inode, new_size);
 495
 496         down_write(&ni->file.run_lock);
 497         err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 498                             &new_valid, true, NULL);
 499         up_write(&ni->file.run_lock);
 500
 501         if (new_valid < ni->i_valid)
 502                 ni->i_valid = new_valid;
 503
 504         ni_unlock(ni);
 505
 506         ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 507         inode->i_ctime = inode->i_mtime = current_time(inode);
 508         if (!IS_DIRSYNC(inode)) {
 509                 dirty = 1;
 510         } else {
 511                 err = ntfs_sync_inode(inode);
 512                 if (err)
 513                         return err;
 514         }
 515
 516         if (dirty)
 517                 mark_inode_dirty(inode);
 518
 519         /*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/
 520
 521         return 0;
 522 }
 523
 524 /*
 525  * ntfs_fallocate
 526  *
 527  * Preallocate space for a file. This implements ntfs's fallocate file
 528  * operation, which gets called from sys_fallocate system call. User
 529  * space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set
 530  * we just allocate clusters without zeroing them out. Otherwise we
 531  * allocate and zero out clusters via an expanding truncate.
 532  */
 533 static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
 534 {
 535         struct inode *inode = file->f_mapping->host;
 536         struct super_block *sb = inode->i_sb;
 537         struct ntfs_sb_info *sbi = sb->s_fs_info;
 538         struct ntfs_inode *ni = ntfs_i(inode);
 539         loff_t end = vbo + len;
 540         loff_t vbo_down = round_down(vbo, PAGE_SIZE);
 541         loff_t i_size;
 542         int err;
 543
 544         /* No support for dir. */
 545         if (!S_ISREG(inode->i_mode))
 546                 return -EOPNOTSUPP;
 547
 548         /* Return error if mode is not supported. */
 549         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
 550                      FALLOC_FL_COLLAPSE_RANGE)) {
 551                 ntfs_inode_warn(inode, "fallocate(0x%x) is not supported",
 552                                 mode);
 553                 return -EOPNOTSUPP;
 554         }
 555
 556         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
 557
 558         inode_lock(inode);
 559         i_size = inode->i_size;
 560
 561         if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
 562                 /* Should never be here, see ntfs_file_open. */
 563                 err = -EOPNOTSUPP;
 564                 goto out;
 565         }
 566
 567         if (mode & FALLOC_FL_PUNCH_HOLE) {
 568                 u32 frame_size;
 569                 loff_t mask, vbo_a, end_a, tmp;
 570
 571                 if (!(mode & FALLOC_FL_KEEP_SIZE)) {
 572                         err = -EINVAL;
 573                         goto out;
 574                 }
 575
 576                 err = filemap_write_and_wait_range(inode->i_mapping, vbo,
 577                                                    end - 1);
 578                 if (err)
 579                         goto out;
 580
 581                 err = filemap_write_and_wait_range(inode->i_mapping, end,
 582                                                    LLONG_MAX);
 583                 if (err)
 584                         goto out;
 585
 586                 inode_dio_wait(inode);
 587
 588                 truncate_pagecache(inode, vbo_down);
 589
 590                 if (!is_sparsed(ni) && !is_compressed(ni)) {
 591                         /*
 592                          * Normal file, can't make hole.
 593                          * TODO: Try to find way to save info about hole.
 594                          */
 595                         err = -EOPNOTSUPP;
 596                         goto out;
 597                 }
 598
 599                 ni_lock(ni);
 600                 err = attr_punch_hole(ni, vbo, len, &frame_size);
 601                 ni_unlock(ni);
 602                 if (err != E_NTFS_NOTALIGNED)
 603                         goto out;
 604
 605                 /* Process not aligned punch. */
 606                 mask = frame_size - 1;
 607                 vbo_a = (vbo + mask) & ~mask;
 608                 end_a = end & ~mask;
 609
 610                 tmp = min(vbo_a, end);
 611                 if (tmp > vbo) {
 612                         err = ntfs_zero_range(inode, vbo, tmp);
 613                         if (err)
 614                                 goto out;
 615                 }
 616
 617                 if (vbo < end_a && end_a < end) {
 618                         err = ntfs_zero_range(inode, end_a, end);
 619                         if (err)
 620                                 goto out;
 621                 }
 622
 623                 /* Aligned punch_hole */
 624                 if (end_a > vbo_a) {
 625                         ni_lock(ni);
 626                         err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL);
 627                         ni_unlock(ni);
 628                 }
 629         } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
 630                 if (mode & ~FALLOC_FL_COLLAPSE_RANGE) {
 631                         err = -EINVAL;
 632                         goto out;
 633                 }
 634
 635                 /*
 636                  * Write tail of the last page before removed range since
 637                  * it will get removed from the page cache below.
 638                  */
 639                 err = filemap_write_and_wait_range(inode->i_mapping, vbo_down,
 640                                                    vbo);
 641                 if (err)
 642                         goto out;
 643
 644                 /*
 645                  * Write data that will be shifted to preserve them
 646                  * when discarding page cache below.
 647                  */
 648                 err = filemap_write_and_wait_range(inode->i_mapping, end,
 649                                                    LLONG_MAX);
 650                 if (err)
 651                         goto out;
 652
 653                 /* Wait for existing dio to complete. */
 654                 inode_dio_wait(inode);
 655
 656                 truncate_pagecache(inode, vbo_down);
 657
 658                 ni_lock(ni);
 659                 err = attr_collapse_range(ni, vbo, len);
 660                 ni_unlock(ni);
 661         } else {
 662                 /*
 663                  * Normal file: Allocate clusters, do not change 'valid' size.
 664                  */
 665                 err = ntfs_set_size(inode, max(end, i_size));
 666                 if (err)
 667                         goto out;
 668
 669                 if (is_sparsed(ni) || is_compressed(ni)) {
 670                         CLST vcn_v = ni->i_valid >> sbi->cluster_bits;
 671                         CLST vcn = vbo >> sbi->cluster_bits;
 672                         CLST cend = bytes_to_cluster(sbi, end);
 673                         CLST lcn, clen;
 674                         bool new;
 675
 676                         /*
 677                          * Allocate but do not zero new clusters. (see below comments)
 678                          * This breaks security: One can read unused on-disk areas.
 679                          * Zeroing these clusters may be too long.
 680                          * Maybe we should check here for root rights?
 681                          */
 682                         for (; vcn < cend; vcn += clen) {
 683                                 err = attr_data_get_block(ni, vcn, cend - vcn,
 684                                                           &lcn, &clen, &new);
 685                                 if (err)
 686                                         goto out;
 687                                 if (!new || vcn >= vcn_v)
 688                                         continue;
 689
 690                                 /*
 691                                  * Unwritten area.
 692                                  * NTFS is not able to store several unwritten areas.
 693                                  * Activate 'ntfs_sparse_cluster' to zero new allocated clusters.
 694                                  *
 695                                  * Dangerous in case:
 696                                  * 1G of sparsed clusters + 1 cluster of data =>
 697                                  * valid_size == 1G + 1 cluster
 698                                  * fallocate(1G) will zero 1G and this can be very long
 699                                  * xfstest 016/086 will fail without 'ntfs_sparse_cluster'.
 700                                  */
 701                                 ntfs_sparse_cluster(inode, NULL, vcn,
 702                                                     min(vcn_v - vcn, clen));
 703                         }
 704                 }
 705
 706                 if (mode & FALLOC_FL_KEEP_SIZE) {
 707                         ni_lock(ni);
 708                         /* True - Keep preallocated. */
 709                         err = attr_set_size(ni, ATTR_DATA, NULL, 0,
 710                                             &ni->file.run, i_size, &ni->i_valid,
 711                                             true, NULL);
 712                         ni_unlock(ni);
 713                 }
 714         }
 715
 716 out:
 717         if (err == -EFBIG)
 718                 err = -ENOSPC;
 719
 720         if (!err) {
 721                 inode->i_ctime = inode->i_mtime = current_time(inode);
 722                 mark_inode_dirty(inode);
 723         }
 724
 725         inode_unlock(inode);
 726         return err;
 727 }
 728
 729 /*
 730  * ntfs3_setattr - inode_operations::setattr
 731  */
 732 int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 733                   struct iattr *attr)
 734 {
 735         struct super_block *sb = dentry->d_sb;
 736         struct ntfs_sb_info *sbi = sb->s_fs_info;
 737         struct inode *inode = d_inode(dentry);
 738         struct ntfs_inode *ni = ntfs_i(inode);
 739         u32 ia_valid = attr->ia_valid;
 740         umode_t mode = inode->i_mode;
 741         int err;
 742
 743         if (sbi->options->noacsrules) {
 744                 /* "No access rules" - Force any changes of time etc. */
 745                 attr->ia_valid |= ATTR_FORCE;
 746                 /* and disable for editing some attributes. */
 747                 attr->ia_valid &= ~(ATTR_UID | ATTR_GID | ATTR_MODE);
 748                 ia_valid = attr->ia_valid;
 749         }
 750
 751         err = setattr_prepare(mnt_userns, dentry, attr);
 752         if (err)
 753                 goto out;
 754
 755         if (ia_valid & ATTR_SIZE) {
 756                 loff_t oldsize = inode->i_size;
 757
 758                 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
 759                         /* Should never be here, see ntfs_file_open(). */
 760                         err = -EOPNOTSUPP;
 761                         goto out;
 762                 }
 763                 inode_dio_wait(inode);
 764
 765                 if (attr->ia_size < oldsize)
 766                         err = ntfs_truncate(inode, attr->ia_size);
 767                 else if (attr->ia_size > oldsize)
 768                         err = ntfs_extend(inode, attr->ia_size, 0, NULL);
 769
 770                 if (err)
 771                         goto out;
 772
 773                 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
 774         }
 775
 776         setattr_copy(mnt_userns, inode, attr);
 777
 778         if (mode != inode->i_mode) {
 779                 err = ntfs_acl_chmod(mnt_userns, inode);
 780                 if (err)
 781                         goto out;
 782
 783                 /* Linux 'w' -> Windows 'ro'. */
 784                 if (0222 & inode->i_mode)
 785                         ni->std_fa &= ~FILE_ATTRIBUTE_READONLY;
 786                 else
 787                         ni->std_fa |= FILE_ATTRIBUTE_READONLY;
 788         }
 789
 790         if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE))
 791                 ntfs_save_wsl_perm(inode);
 792         mark_inode_dirty(inode);
 793 out:
 794         return err;
 795 }
 796
 797 static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 798 {
 799         struct file *file = iocb->ki_filp;
 800         struct inode *inode = file->f_mapping->host;
 801         struct ntfs_inode *ni = ntfs_i(inode);
 802
 803         if (is_encrypted(ni)) {
 804                 ntfs_inode_warn(inode, "encrypted i/o not supported");
 805                 return -EOPNOTSUPP;
 806         }
 807
 808         if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
 809                 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
 810                 return -EOPNOTSUPP;
 811         }
 812
 813 #ifndef CONFIG_NTFS3_LZX_XPRESS
 814         if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) {
 815                 ntfs_inode_warn(
 816                         inode,
 817                         "activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files");
 818                 return -EOPNOTSUPP;
 819         }
 820 #endif
 821
 822         if (is_dedup(ni)) {
 823                 ntfs_inode_warn(inode, "read deduplicated not supported");
 824                 return -EOPNOTSUPP;
 825         }
 826
 827         return generic_file_read_iter(iocb, iter);
 828 }
 829
 830 /*
 831  * ntfs_get_frame_pages
 832  *
 833  * Return: Array of locked pages.
 834  */
 835 static int ntfs_get_frame_pages(struct address_space *mapping, pgoff_t index,
 836                                 struct page **pages, u32 pages_per_frame,
 837                                 bool *frame_uptodate)
 838 {
 839         gfp_t gfp_mask = mapping_gfp_mask(mapping);
 840         u32 npages;
 841
 842         *frame_uptodate = true;
 843
 844         for (npages = 0; npages < pages_per_frame; npages++, index++) {
 845                 struct page *page;
 846
 847                 page = find_or_create_page(mapping, index, gfp_mask);
 848                 if (!page) {
 849                         while (npages--) {
 850                                 page = pages[npages];
 851                                 unlock_page(page);
 852                                 put_page(page);
 853                         }
 854
 855                         return -ENOMEM;
 856                 }
 857
 858                 if (!PageUptodate(page))
 859                         *frame_uptodate = false;
 860
 861                 pages[npages] = page;
 862         }
 863
 864         return 0;
 865 }
 866
 867 /*
 868  * ntfs_compress_write - Helper for ntfs_file_write_iter() (compressed files).
 869  */
 870 static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
 871 {
 872         int err;
 873         struct file *file = iocb->ki_filp;
 874         size_t count = iov_iter_count(from);
 875         loff_t pos = iocb->ki_pos;
 876         struct inode *inode = file_inode(file);
 877         loff_t i_size = inode->i_size;
 878         struct address_space *mapping = inode->i_mapping;
 879         struct ntfs_inode *ni = ntfs_i(inode);
 880         u64 valid = ni->i_valid;
 881         struct ntfs_sb_info *sbi = ni->mi.sbi;
 882         struct page *page, **pages = NULL;
 883         size_t written = 0;
 884         u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits;
 885         u32 frame_size = 1u << frame_bits;
 886         u32 pages_per_frame = frame_size >> PAGE_SHIFT;
 887         u32 ip, off;
 888         CLST frame;
 889         u64 frame_vbo;
 890         pgoff_t index;
 891         bool frame_uptodate;
 892
 893         if (frame_size < PAGE_SIZE) {
 894                 /*
 895                  * frame_size == 8K if cluster 512
 896                  * frame_size == 64K if cluster 4096
 897                  */
 898                 ntfs_inode_warn(inode, "page size is bigger than frame size");
 899                 return -EOPNOTSUPP;
 900         }
 901
 902         pages = kmalloc_array(pages_per_frame, sizeof(struct page *), GFP_NOFS);
 903         if (!pages)
 904                 return -ENOMEM;
 905
 906         current->backing_dev_info = inode_to_bdi(inode);
 907         err = file_remove_privs(file);
 908         if (err)
 909                 goto out;
 910
 911         err = file_update_time(file);
 912         if (err)
 913                 goto out;
 914
 915         /* Zero range [valid : pos). */
 916         while (valid < pos) {
 917                 CLST lcn, clen;
 918
 919                 frame = valid >> frame_bits;
 920                 frame_vbo = valid & ~(frame_size - 1);
 921                 off = valid & (frame_size - 1);
 922
 923                 err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 0, &lcn,
 924                                           &clen, NULL);
 925                 if (err)
 926                         goto out;
 927
 928                 if (lcn == SPARSE_LCN) {
 929                         ni->i_valid = valid =
 930                                 frame_vbo + ((u64)clen << sbi->cluster_bits);
 931                         continue;
 932                 }
 933
 934                 /* Load full frame. */
 935                 err = ntfs_get_frame_pages(mapping, frame_vbo >> PAGE_SHIFT,
 936                                            pages, pages_per_frame,
 937                                            &frame_uptodate);
 938                 if (err)
 939                         goto out;
 940
 941                 if (!frame_uptodate && off) {
 942                         err = ni_read_frame(ni, frame_vbo, pages,
 943                                             pages_per_frame);
 944                         if (err) {
 945                                 for (ip = 0; ip < pages_per_frame; ip++) {
 946                                         page = pages[ip];
 947                                         unlock_page(page);
 948                                         put_page(page);
 949                                 }
 950                                 goto out;
 951                         }
 952                 }
 953
 954                 ip = off >> PAGE_SHIFT;
 955                 off = offset_in_page(valid);
 956                 for (; ip < pages_per_frame; ip++, off = 0) {
 957                         page = pages[ip];
 958                         zero_user_segment(page, off, PAGE_SIZE);
 959                         flush_dcache_page(page);
 960                         SetPageUptodate(page);
 961                 }
 962
 963                 ni_lock(ni);
 964                 err = ni_write_frame(ni, pages, pages_per_frame);
 965                 ni_unlock(ni);
 966
 967                 for (ip = 0; ip < pages_per_frame; ip++) {
 968                         page = pages[ip];
 969                         SetPageUptodate(page);
 970                         unlock_page(page);
 971                         put_page(page);
 972                 }
 973
 974                 if (err)
 975                         goto out;
 976
 977                 ni->i_valid = valid = frame_vbo + frame_size;
 978         }
 979
 980         /* Copy user data [pos : pos + count). */
 981         while (count) {
 982                 size_t copied, bytes;
 983
 984                 off = pos & (frame_size - 1);
 985                 bytes = frame_size - off;
 986                 if (bytes > count)
 987                         bytes = count;
 988
 989                 frame = pos >> frame_bits;
 990                 frame_vbo = pos & ~(frame_size - 1);
 991                 index = frame_vbo >> PAGE_SHIFT;
 992
 993                 if (unlikely(fault_in_iov_iter_readable(from, bytes))) {
 994                         err = -EFAULT;
 995                         goto out;
 996                 }
 997
 998                 /* Load full frame. */
 999                 err = ntfs_get_frame_pages(mapping, index, pages,
1000                                            pages_per_frame, &frame_uptodate);
1001                 if (err)
1002                         goto out;
1003
1004                 if (!frame_uptodate) {
1005                         loff_t to = pos + bytes;
1006
1007                         if (off || (to < i_size && (to & (frame_size - 1)))) {
1008                                 err = ni_read_frame(ni, frame_vbo, pages,
1009                                                     pages_per_frame);
1010                                 if (err) {
1011                                         for (ip = 0; ip < pages_per_frame;
1012                                              ip++) {
1013                                                 page = pages[ip];
1014                                                 unlock_page(page);
1015                                                 put_page(page);
1016                                         }
1017                                         goto out;
1018                                 }
1019                         }
1020                 }
1021
1022                 WARN_ON(!bytes);
1023                 copied = 0;
1024                 ip = off >> PAGE_SHIFT;
1025                 off = offset_in_page(pos);
1026
1027                 /* Copy user data to pages. */
1028                 for (;;) {
1029                         size_t cp, tail = PAGE_SIZE - off;
1030
1031                         page = pages[ip];
1032                         cp = copy_page_from_iter_atomic(page, off,
1033                                                         min(tail, bytes), from);
1034                         flush_dcache_page(page);
1035
1036                         copied += cp;
1037                         bytes -= cp;
1038                         if (!bytes || !cp)
1039                                 break;
1040
1041                         if (cp < tail) {
1042                                 off += cp;
1043                         } else {
1044                                 ip++;
1045                                 off = 0;
1046                         }
1047                 }
1048
1049                 ni_lock(ni);
1050                 err = ni_write_frame(ni, pages, pages_per_frame);
1051                 ni_unlock(ni);
1052
1053                 for (ip = 0; ip < pages_per_frame; ip++) {
1054                         page = pages[ip];
1055                         ClearPageDirty(page);
1056                         SetPageUptodate(page);
1057                         unlock_page(page);
1058                         put_page(page);
1059                 }
1060
1061                 if (err)
1062                         goto out;
1063
1064                 /*
1065                  * We can loop for a long time in here. Be nice and allow
1066                  * us to schedule out to avoid softlocking if preempt
1067                  * is disabled.
1068                  */
1069                 cond_resched();
1070
1071                 pos += copied;
1072                 written += copied;
1073
1074                 count = iov_iter_count(from);
1075         }
1076
1077 out:
1078         kfree(pages);
1079
1080         current->backing_dev_info = NULL;
1081
1082         if (err < 0)
1083                 return err;
1084
1085         iocb->ki_pos += written;
1086         if (iocb->ki_pos > ni->i_valid)
1087                 ni->i_valid = iocb->ki_pos;
1088
1089         return written;
1090 }
1091
1092 /*
1093  * ntfs_file_write_iter - file_operations::write_iter
1094  */
1095 static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1096 {
1097         struct file *file = iocb->ki_filp;
1098         struct address_space *mapping = file->f_mapping;
1099         struct inode *inode = mapping->host;
1100         ssize_t ret;
1101         struct ntfs_inode *ni = ntfs_i(inode);
1102
1103         if (is_encrypted(ni)) {
1104                 ntfs_inode_warn(inode, "encrypted i/o not supported");
1105                 return -EOPNOTSUPP;
1106         }
1107
1108         if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
1109                 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
1110                 return -EOPNOTSUPP;
1111         }
1112
1113         if (is_dedup(ni)) {
1114                 ntfs_inode_warn(inode, "write into deduplicated not supported");
1115                 return -EOPNOTSUPP;
1116         }
1117
1118         if (!inode_trylock(inode)) {
1119                 if (iocb->ki_flags & IOCB_NOWAIT)
1120                         return -EAGAIN;
1121                 inode_lock(inode);
1122         }
1123
1124         ret = generic_write_checks(iocb, from);
1125         if (ret <= 0)
1126                 goto out;
1127
1128         if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
1129                 /* Should never be here, see ntfs_file_open(). */
1130                 ret = -EOPNOTSUPP;
1131                 goto out;
1132         }
1133
1134         ret = ntfs_extend(inode, iocb->ki_pos, ret, file);
1135         if (ret)
1136                 goto out;
1137
1138         ret = is_compressed(ni) ? ntfs_compress_write(iocb, from)
1139                                 : __generic_file_write_iter(iocb, from);
1140
1141 out:
1142         inode_unlock(inode);
1143
1144         if (ret > 0)
1145                 ret = generic_write_sync(iocb, ret);
1146
1147         return ret;
1148 }
1149
1150 /*
1151  * ntfs_file_open - file_operations::open
1152  */
1153 int ntfs_file_open(struct inode *inode, struct file *file)
1154 {
1155         struct ntfs_inode *ni = ntfs_i(inode);
1156
1157         if (unlikely((is_compressed(ni) || is_encrypted(ni)) &&
1158                      (file->f_flags & O_DIRECT))) {
1159                 return -EOPNOTSUPP;
1160         }
1161
1162         /* Decompress "external compressed" file if opened for rw. */
1163         if ((ni->ni_flags & NI_FLAG_COMPRESSED_MASK) &&
1164             (file->f_flags & (O_WRONLY | O_RDWR | O_TRUNC))) {
1165 #ifdef CONFIG_NTFS3_LZX_XPRESS
1166                 int err = ni_decompress_file(ni);
1167
1168                 if (err)
1169                         return err;
1170 #else
1171                 ntfs_inode_warn(
1172                         inode,
1173                         "activate CONFIG_NTFS3_LZX_XPRESS to write external compressed files");
1174                 return -EOPNOTSUPP;
1175 #endif
1176         }
1177
1178         return generic_file_open(inode, file);
1179 }
1180
1181 /*
1182  * ntfs_file_release - file_operations::release
1183  */
1184 static int ntfs_file_release(struct inode *inode, struct file *file)
1185 {
1186         struct ntfs_inode *ni = ntfs_i(inode);
1187         struct ntfs_sb_info *sbi = ni->mi.sbi;
1188         int err = 0;
1189
1190         /* If we are last writer on the inode, drop the block reservation. */
1191         if (sbi->options->prealloc && ((file->f_mode & FMODE_WRITE) &&
1192                                       atomic_read(&inode->i_writecount) == 1)) {
1193                 ni_lock(ni);
1194                 down_write(&ni->file.run_lock);
1195
1196                 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
1197                                     inode->i_size, &ni->i_valid, false, NULL);
1198
1199                 up_write(&ni->file.run_lock);
1200                 ni_unlock(ni);
1201         }
1202         return err;
1203 }
1204
1205 /*
1206  * ntfs_fiemap - file_operations::fiemap
1207  */
1208 int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1209                 __u64 start, __u64 len)
1210 {
1211         int err;
1212         struct ntfs_inode *ni = ntfs_i(inode);
1213
1214         err = fiemap_prep(inode, fieinfo, start, &len, ~FIEMAP_FLAG_XATTR);
1215         if (err)
1216                 return err;
1217
1218         ni_lock(ni);
1219
1220         err = ni_fiemap(ni, fieinfo, start, len);
1221
1222         ni_unlock(ni);
1223
1224         return err;
1225 }
1226
1227 // clang-format off
1228 const struct inode_operations ntfs_file_inode_operations = {
1229         .getattr        = ntfs_getattr,
1230         .setattr        = ntfs3_setattr,
1231         .listxattr      = ntfs_listxattr,
1232         .permission     = ntfs_permission,
1233         .get_acl        = ntfs_get_acl,
1234         .set_acl        = ntfs_set_acl,
1235         .fiemap         = ntfs_fiemap,
1236 };
1237
1238 const struct file_operations ntfs_file_operations = {
1239         .llseek         = generic_file_llseek,
1240         .read_iter      = ntfs_file_read_iter,
1241         .write_iter     = ntfs_file_write_iter,
1242         .unlocked_ioctl = ntfs_ioctl,
1243 #ifdef CONFIG_COMPAT
1244         .compat_ioctl   = ntfs_compat_ioctl,
1245 #endif
1246         .splice_read    = generic_file_splice_read,
1247         .mmap           = ntfs_file_mmap,
1248         .open           = ntfs_file_open,
1249         .fsync          = generic_file_fsync,
1250         .splice_write   = iter_file_splice_write,
1251         .fallocate      = ntfs_fallocate,
1252         .release        = ntfs_file_release,
1253 };
1254 // clang-format on