1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 * Regular file handling primitives for NTFS-based filesystems. 7 * 8 */ 9 10 #include <linux/backing-dev.h> 11 #include <linux/blkdev.h> 12 #include <linux/buffer_head.h> 13 #include <linux/compat.h> 14 #include <linux/falloc.h> 15 #include <linux/fiemap.h> 16 17 #include "debug.h" 18 #include "ntfs.h" 19 #include "ntfs_fs.h" 20 21 static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg) 22 { 23 struct fstrim_range __user *user_range; 24 struct fstrim_range range; 25 int err; 26 27 if (!capable(CAP_SYS_ADMIN)) 28 return -EPERM; 29 30 if (!bdev_max_discard_sectors(sbi->sb->s_bdev)) 31 return -EOPNOTSUPP; 32 33 user_range = (struct fstrim_range __user *)arg; 34 if (copy_from_user(&range, user_range, sizeof(range))) 35 return -EFAULT; 36 37 range.minlen = max_t(u32, range.minlen, 38 bdev_discard_granularity(sbi->sb->s_bdev)); 39 40 err = ntfs_trim_fs(sbi, &range); 41 if (err < 0) 42 return err; 43 44 if (copy_to_user(user_range, &range, sizeof(range))) 45 return -EFAULT; 46 47 return 0; 48 } 49 50 static long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg) 51 { 52 struct inode *inode = file_inode(filp); 53 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 54 55 switch (cmd) { 56 case FITRIM: 57 return ntfs_ioctl_fitrim(sbi, arg); 58 } 59 return -ENOTTY; /* Inappropriate ioctl for device. */ 60 } 61 62 #ifdef CONFIG_COMPAT 63 static long ntfs_compat_ioctl(struct file *filp, u32 cmd, unsigned long arg) 64 65 { 66 return ntfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); 67 } 68 #endif 69 70 /* 71 * ntfs_getattr - inode_operations::getattr 72 */ 73 int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path, 74 struct kstat *stat, u32 request_mask, u32 flags) 75 { 76 struct inode *inode = d_inode(path->dentry); 77 struct ntfs_inode *ni = ntfs_i(inode); 78 79 if (is_compressed(ni)) 80 stat->attributes |= STATX_ATTR_COMPRESSED; 81 82 if (is_encrypted(ni)) 83 stat->attributes |= STATX_ATTR_ENCRYPTED; 84 85 stat->attributes_mask |= STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED; 86 87 generic_fillattr(mnt_userns, inode, stat); 88 89 stat->result_mask |= STATX_BTIME; 90 stat->btime = ni->i_crtime; 91 stat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */ 92 93 return 0; 94 } 95 96 static int ntfs_extend_initialized_size(struct file *file, 97 struct ntfs_inode *ni, 98 const loff_t valid, 99 const loff_t new_valid) 100 { 101 struct inode *inode = &ni->vfs_inode; 102 struct address_space *mapping = inode->i_mapping; 103 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 104 loff_t pos = valid; 105 int err; 106 107 if (is_resident(ni)) { 108 ni->i_valid = new_valid; 109 return 0; 110 } 111 112 WARN_ON(is_compressed(ni)); 113 WARN_ON(valid >= new_valid); 114 115 for (;;) { 116 u32 zerofrom, len; 117 struct page *page; 118 u8 bits; 119 CLST vcn, lcn, clen; 120 121 if (is_sparsed(ni)) { 122 bits = sbi->cluster_bits; 123 vcn = pos >> bits; 124 125 err = attr_data_get_block(ni, vcn, 0, &lcn, &clen, 126 NULL); 127 if (err) 128 goto out; 129 130 if (lcn == SPARSE_LCN) { 131 loff_t vbo = (loff_t)vcn << bits; 132 loff_t to = vbo + ((loff_t)clen << bits); 133 134 if (to <= new_valid) { 135 ni->i_valid = to; 136 pos = to; 137 goto next; 138 } 139 140 if (vbo < pos) { 141 pos = vbo; 142 } else { 143 to = (new_valid >> bits) << bits; 144 if (pos < to) { 145 ni->i_valid = to; 146 pos = to; 147 goto next; 148 } 149 } 150 } 151 } 152 153 zerofrom = pos & (PAGE_SIZE - 1); 154 len = PAGE_SIZE - zerofrom; 155 156 if (pos + len > new_valid) 157 len = new_valid - pos; 158 159 err = ntfs_write_begin(file, mapping, pos, len, &page, NULL); 160 if (err) 161 goto out; 162 163 zero_user_segment(page, zerofrom, PAGE_SIZE); 164 165 /* This function in any case puts page. */ 166 err = ntfs_write_end(file, mapping, pos, len, len, page, NULL); 167 if (err < 0) 168 goto out; 169 pos += len; 170 171 next: 172 if (pos >= new_valid) 173 break; 174 175 balance_dirty_pages_ratelimited(mapping); 176 cond_resched(); 177 } 178 179 return 0; 180 181 out: 182 ni->i_valid = valid; 183 ntfs_inode_warn(inode, "failed to extend initialized size to %llx.", 184 new_valid); 185 return err; 186 } 187 188 /* 189 * ntfs_zero_range - Helper function for punch_hole. 190 * 191 * It zeroes a range [vbo, vbo_to). 192 */ 193 static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to) 194 { 195 int err = 0; 196 struct address_space *mapping = inode->i_mapping; 197 u32 blocksize = 1 << inode->i_blkbits; 198 pgoff_t idx = vbo >> PAGE_SHIFT; 199 u32 z_start = vbo & (PAGE_SIZE - 1); 200 pgoff_t idx_end = (vbo_to + PAGE_SIZE - 1) >> PAGE_SHIFT; 201 loff_t page_off; 202 struct buffer_head *head, *bh; 203 u32 bh_next, bh_off, z_end; 204 sector_t iblock; 205 struct page *page; 206 207 for (; idx < idx_end; idx += 1, z_start = 0) { 208 page_off = (loff_t)idx << PAGE_SHIFT; 209 z_end = (page_off + PAGE_SIZE) > vbo_to ? (vbo_to - page_off) 210 : PAGE_SIZE; 211 iblock = page_off >> inode->i_blkbits; 212 213 page = find_or_create_page(mapping, idx, 214 mapping_gfp_constraint(mapping, 215 ~__GFP_FS)); 216 if (!page) 217 return -ENOMEM; 218 219 if (!page_has_buffers(page)) 220 create_empty_buffers(page, blocksize, 0); 221 222 bh = head = page_buffers(page); 223 bh_off = 0; 224 do { 225 bh_next = bh_off + blocksize; 226 227 if (bh_next <= z_start || bh_off >= z_end) 228 continue; 229 230 if (!buffer_mapped(bh)) { 231 ntfs_get_block(inode, iblock, bh, 0); 232 /* Unmapped? It's a hole - nothing to do. */ 233 if (!buffer_mapped(bh)) 234 continue; 235 } 236 237 /* Ok, it's mapped. Make sure it's up-to-date. */ 238 if (PageUptodate(page)) 239 set_buffer_uptodate(bh); 240 241 if (!buffer_uptodate(bh)) { 242 lock_buffer(bh); 243 bh->b_end_io = end_buffer_read_sync; 244 get_bh(bh); 245 submit_bh(REQ_OP_READ, 0, bh); 246 247 wait_on_buffer(bh); 248 if (!buffer_uptodate(bh)) { 249 unlock_page(page); 250 put_page(page); 251 err = -EIO; 252 goto out; 253 } 254 } 255 256 mark_buffer_dirty(bh); 257 258 } while (bh_off = bh_next, iblock += 1, 259 head != (bh = bh->b_this_page)); 260 261 zero_user_segment(page, z_start, z_end); 262 263 unlock_page(page); 264 put_page(page); 265 cond_resched(); 266 } 267 out: 268 mark_inode_dirty(inode); 269 return err; 270 } 271 272 /* 273 * ntfs_sparse_cluster - Helper function to zero a new allocated clusters. 274 * 275 * NOTE: 512 <= cluster size <= 2M 276 */ 277 void ntfs_sparse_cluster(struct inode *inode, struct page *page0, CLST vcn, 278 CLST len) 279 { 280 struct address_space *mapping = inode->i_mapping; 281 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 282 u64 vbo = (u64)vcn << sbi->cluster_bits; 283 u64 bytes = (u64)len << sbi->cluster_bits; 284 u32 blocksize = 1 << inode->i_blkbits; 285 pgoff_t idx0 = page0 ? page0->index : -1; 286 loff_t vbo_clst = vbo & sbi->cluster_mask_inv; 287 loff_t end = ntfs_up_cluster(sbi, vbo + bytes); 288 pgoff_t idx = vbo_clst >> PAGE_SHIFT; 289 u32 from = vbo_clst & (PAGE_SIZE - 1); 290 pgoff_t idx_end = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; 291 loff_t page_off; 292 u32 to; 293 bool partial; 294 struct page *page; 295 296 for (; idx < idx_end; idx += 1, from = 0) { 297 page = idx == idx0 ? page0 : grab_cache_page(mapping, idx); 298 299 if (!page) 300 continue; 301 302 page_off = (loff_t)idx << PAGE_SHIFT; 303 to = (page_off + PAGE_SIZE) > end ? (end - page_off) 304 : PAGE_SIZE; 305 partial = false; 306 307 if ((from || PAGE_SIZE != to) && 308 likely(!page_has_buffers(page))) { 309 create_empty_buffers(page, blocksize, 0); 310 } 311 312 if (page_has_buffers(page)) { 313 struct buffer_head *head, *bh; 314 u32 bh_off = 0; 315 316 bh = head = page_buffers(page); 317 do { 318 u32 bh_next = bh_off + blocksize; 319 320 if (from <= bh_off && bh_next <= to) { 321 set_buffer_uptodate(bh); 322 mark_buffer_dirty(bh); 323 } else if (!buffer_uptodate(bh)) { 324 partial = true; 325 } 326 bh_off = bh_next; 327 } while (head != (bh = bh->b_this_page)); 328 } 329 330 zero_user_segment(page, from, to); 331 332 if (!partial) { 333 if (!PageUptodate(page)) 334 SetPageUptodate(page); 335 set_page_dirty(page); 336 } 337 338 if (idx != idx0) { 339 unlock_page(page); 340 put_page(page); 341 } 342 cond_resched(); 343 } 344 mark_inode_dirty(inode); 345 } 346 347 /* 348 * ntfs_file_mmap - file_operations::mmap 349 */ 350 static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma) 351 { 352 struct address_space *mapping = file->f_mapping; 353 struct inode *inode = mapping->host; 354 struct ntfs_inode *ni = ntfs_i(inode); 355 u64 from = ((u64)vma->vm_pgoff << PAGE_SHIFT); 356 bool rw = vma->vm_flags & VM_WRITE; 357 int err; 358 359 if (is_encrypted(ni)) { 360 ntfs_inode_warn(inode, "mmap encrypted not supported"); 361 return -EOPNOTSUPP; 362 } 363 364 if (is_dedup(ni)) { 365 ntfs_inode_warn(inode, "mmap deduplicated not supported"); 366 return -EOPNOTSUPP; 367 } 368 369 if (is_compressed(ni) && rw) { 370 ntfs_inode_warn(inode, "mmap(write) compressed not supported"); 371 return -EOPNOTSUPP; 372 } 373 374 if (rw) { 375 u64 to = min_t(loff_t, i_size_read(inode), 376 from + vma->vm_end - vma->vm_start); 377 378 if (is_sparsed(ni)) { 379 /* Allocate clusters for rw map. */ 380 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 381 CLST lcn, len; 382 CLST vcn = from >> sbi->cluster_bits; 383 CLST end = bytes_to_cluster(sbi, to); 384 bool new; 385 386 for (; vcn < end; vcn += len) { 387 err = attr_data_get_block(ni, vcn, 1, &lcn, 388 &len, &new); 389 if (err) 390 goto out; 391 392 if (!new) 393 continue; 394 ntfs_sparse_cluster(inode, NULL, vcn, 1); 395 } 396 } 397 398 if (ni->i_valid < to) { 399 if (!inode_trylock(inode)) { 400 err = -EAGAIN; 401 goto out; 402 } 403 err = ntfs_extend_initialized_size(file, ni, 404 ni->i_valid, to); 405 inode_unlock(inode); 406 if (err) 407 goto out; 408 } 409 } 410 411 err = generic_file_mmap(file, vma); 412 out: 413 return err; 414 } 415 416 static int ntfs_extend(struct inode *inode, loff_t pos, size_t count, 417 struct file *file) 418 { 419 struct ntfs_inode *ni = ntfs_i(inode); 420 struct address_space *mapping = inode->i_mapping; 421 loff_t end = pos + count; 422 bool extend_init = file && pos > ni->i_valid; 423 int err; 424 425 if (end <= inode->i_size && !extend_init) 426 return 0; 427 428 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 429 ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY); 430 431 if (end > inode->i_size) { 432 err = ntfs_set_size(inode, end); 433 if (err) 434 goto out; 435 inode->i_size = end; 436 } 437 438 if (extend_init && !is_compressed(ni)) { 439 err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos); 440 if (err) 441 goto out; 442 } else { 443 err = 0; 444 } 445 446 inode->i_ctime = inode->i_mtime = current_time(inode); 447 mark_inode_dirty(inode); 448 449 if (IS_SYNC(inode)) { 450 int err2; 451 452 err = filemap_fdatawrite_range(mapping, pos, end - 1); 453 err2 = sync_mapping_buffers(mapping); 454 if (!err) 455 err = err2; 456 err2 = write_inode_now(inode, 1); 457 if (!err) 458 err = err2; 459 if (!err) 460 err = filemap_fdatawait_range(mapping, pos, end - 1); 461 } 462 463 out: 464 return err; 465 } 466 467 static int ntfs_truncate(struct inode *inode, loff_t new_size) 468 { 469 struct super_block *sb = inode->i_sb; 470 struct ntfs_inode *ni = ntfs_i(inode); 471 int err, dirty = 0; 472 u64 new_valid; 473 474 if (!S_ISREG(inode->i_mode)) 475 return 0; 476 477 if (is_compressed(ni)) { 478 if (ni->i_valid > new_size) 479 ni->i_valid = new_size; 480 } else { 481 err = block_truncate_page(inode->i_mapping, new_size, 482 ntfs_get_block); 483 if (err) 484 return err; 485 } 486 487 new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size)); 488 489 ni_lock(ni); 490 491 truncate_setsize(inode, new_size); 492 493 down_write(&ni->file.run_lock); 494 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 495 &new_valid, ni->mi.sbi->options->prealloc, NULL); 496 up_write(&ni->file.run_lock); 497 498 if (new_valid < ni->i_valid) 499 ni->i_valid = new_valid; 500 501 ni_unlock(ni); 502 503 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 504 inode->i_ctime = inode->i_mtime = current_time(inode); 505 if (!IS_DIRSYNC(inode)) { 506 dirty = 1; 507 } else { 508 err = ntfs_sync_inode(inode); 509 if (err) 510 return err; 511 } 512 513 if (dirty) 514 mark_inode_dirty(inode); 515 516 /*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/ 517 518 return 0; 519 } 520 521 /* 522 * ntfs_fallocate 523 * 524 * Preallocate space for a file. This implements ntfs's fallocate file 525 * operation, which gets called from sys_fallocate system call. User 526 * space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set 527 * we just allocate clusters without zeroing them out. Otherwise we 528 * allocate and zero out clusters via an expanding truncate. 529 */ 530 static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len) 531 { 532 struct inode *inode = file->f_mapping->host; 533 struct super_block *sb = inode->i_sb; 534 struct ntfs_sb_info *sbi = sb->s_fs_info; 535 struct ntfs_inode *ni = ntfs_i(inode); 536 loff_t end = vbo + len; 537 loff_t vbo_down = round_down(vbo, PAGE_SIZE); 538 loff_t i_size; 539 int err; 540 541 /* No support for dir. */ 542 if (!S_ISREG(inode->i_mode)) 543 return -EOPNOTSUPP; 544 545 /* Return error if mode is not supported. */ 546 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | 547 FALLOC_FL_COLLAPSE_RANGE)) { 548 ntfs_inode_warn(inode, "fallocate(0x%x) is not supported", 549 mode); 550 return -EOPNOTSUPP; 551 } 552 553 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 554 555 inode_lock(inode); 556 i_size = inode->i_size; 557 558 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) { 559 /* Should never be here, see ntfs_file_open. */ 560 err = -EOPNOTSUPP; 561 goto out; 562 } 563 564 if (mode & FALLOC_FL_PUNCH_HOLE) { 565 u32 frame_size; 566 loff_t mask, vbo_a, end_a, tmp; 567 568 if (!(mode & FALLOC_FL_KEEP_SIZE)) { 569 err = -EINVAL; 570 goto out; 571 } 572 573 err = filemap_write_and_wait_range(inode->i_mapping, vbo, 574 end - 1); 575 if (err) 576 goto out; 577 578 err = filemap_write_and_wait_range(inode->i_mapping, end, 579 LLONG_MAX); 580 if (err) 581 goto out; 582 583 inode_dio_wait(inode); 584 585 truncate_pagecache(inode, vbo_down); 586 587 if (!is_sparsed(ni) && !is_compressed(ni)) { 588 /* 589 * Normal file, can't make hole. 590 * TODO: Try to find way to save info about hole. 591 */ 592 err = -EOPNOTSUPP; 593 goto out; 594 } 595 596 ni_lock(ni); 597 err = attr_punch_hole(ni, vbo, len, &frame_size); 598 ni_unlock(ni); 599 if (err != E_NTFS_NOTALIGNED) 600 goto out; 601 602 /* Process not aligned punch. */ 603 mask = frame_size - 1; 604 vbo_a = (vbo + mask) & ~mask; 605 end_a = end & ~mask; 606 607 tmp = min(vbo_a, end); 608 if (tmp > vbo) { 609 err = ntfs_zero_range(inode, vbo, tmp); 610 if (err) 611 goto out; 612 } 613 614 if (vbo < end_a && end_a < end) { 615 err = ntfs_zero_range(inode, end_a, end); 616 if (err) 617 goto out; 618 } 619 620 /* Aligned punch_hole */ 621 if (end_a > vbo_a) { 622 ni_lock(ni); 623 err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL); 624 ni_unlock(ni); 625 } 626 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) { 627 if (mode & ~FALLOC_FL_COLLAPSE_RANGE) { 628 err = -EINVAL; 629 goto out; 630 } 631 632 /* 633 * Write tail of the last page before removed range since 634 * it will get removed from the page cache below. 635 */ 636 err = filemap_write_and_wait_range(inode->i_mapping, vbo_down, 637 vbo); 638 if (err) 639 goto out; 640 641 /* 642 * Write data that will be shifted to preserve them 643 * when discarding page cache below. 644 */ 645 err = filemap_write_and_wait_range(inode->i_mapping, end, 646 LLONG_MAX); 647 if (err) 648 goto out; 649 650 /* Wait for existing dio to complete. */ 651 inode_dio_wait(inode); 652 653 truncate_pagecache(inode, vbo_down); 654 655 ni_lock(ni); 656 err = attr_collapse_range(ni, vbo, len); 657 ni_unlock(ni); 658 } else { 659 /* 660 * Normal file: Allocate clusters, do not change 'valid' size. 661 */ 662 loff_t new_size = max(end, i_size); 663 664 err = inode_newsize_ok(inode, new_size); 665 if (err) 666 goto out; 667 668 err = ntfs_set_size(inode, new_size); 669 if (err) 670 goto out; 671 672 if (is_sparsed(ni) || is_compressed(ni)) { 673 CLST vcn_v = ni->i_valid >> sbi->cluster_bits; 674 CLST vcn = vbo >> sbi->cluster_bits; 675 CLST cend = bytes_to_cluster(sbi, end); 676 CLST lcn, clen; 677 bool new; 678 679 /* 680 * Allocate but do not zero new clusters. (see below comments) 681 * This breaks security: One can read unused on-disk areas. 682 * Zeroing these clusters may be too long. 683 * Maybe we should check here for root rights? 684 */ 685 for (; vcn < cend; vcn += clen) { 686 err = attr_data_get_block(ni, vcn, cend - vcn, 687 &lcn, &clen, &new); 688 if (err) 689 goto out; 690 if (!new || vcn >= vcn_v) 691 continue; 692 693 /* 694 * Unwritten area. 695 * NTFS is not able to store several unwritten areas. 696 * Activate 'ntfs_sparse_cluster' to zero new allocated clusters. 697 * 698 * Dangerous in case: 699 * 1G of sparsed clusters + 1 cluster of data => 700 * valid_size == 1G + 1 cluster 701 * fallocate(1G) will zero 1G and this can be very long 702 * xfstest 016/086 will fail without 'ntfs_sparse_cluster'. 703 */ 704 ntfs_sparse_cluster(inode, NULL, vcn, 705 min(vcn_v - vcn, clen)); 706 } 707 } 708 709 if (mode & FALLOC_FL_KEEP_SIZE) { 710 ni_lock(ni); 711 /* True - Keep preallocated. */ 712 err = attr_set_size(ni, ATTR_DATA, NULL, 0, 713 &ni->file.run, i_size, &ni->i_valid, 714 true, NULL); 715 ni_unlock(ni); 716 } 717 } 718 719 out: 720 if (err == -EFBIG) 721 err = -ENOSPC; 722 723 if (!err) { 724 inode->i_ctime = inode->i_mtime = current_time(inode); 725 mark_inode_dirty(inode); 726 } 727 728 inode_unlock(inode); 729 return err; 730 } 731 732 /* 733 * ntfs3_setattr - inode_operations::setattr 734 */ 735 int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, 736 struct iattr *attr) 737 { 738 struct super_block *sb = dentry->d_sb; 739 struct ntfs_sb_info *sbi = sb->s_fs_info; 740 struct inode *inode = d_inode(dentry); 741 struct ntfs_inode *ni = ntfs_i(inode); 742 u32 ia_valid = attr->ia_valid; 743 umode_t mode = inode->i_mode; 744 int err; 745 746 if (sbi->options->noacsrules) { 747 /* "No access rules" - Force any changes of time etc. */ 748 attr->ia_valid |= ATTR_FORCE; 749 /* and disable for editing some attributes. */ 750 attr->ia_valid &= ~(ATTR_UID | ATTR_GID | ATTR_MODE); 751 ia_valid = attr->ia_valid; 752 } 753 754 err = setattr_prepare(mnt_userns, dentry, attr); 755 if (err) 756 goto out; 757 758 if (ia_valid & ATTR_SIZE) { 759 loff_t oldsize = inode->i_size; 760 761 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) { 762 /* Should never be here, see ntfs_file_open(). */ 763 err = -EOPNOTSUPP; 764 goto out; 765 } 766 inode_dio_wait(inode); 767 768 if (attr->ia_size <= oldsize) 769 err = ntfs_truncate(inode, attr->ia_size); 770 else if (attr->ia_size > oldsize) 771 err = ntfs_extend(inode, attr->ia_size, 0, NULL); 772 773 if (err) 774 goto out; 775 776 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 777 } 778 779 setattr_copy(mnt_userns, inode, attr); 780 781 if (mode != inode->i_mode) { 782 err = ntfs_acl_chmod(mnt_userns, inode); 783 if (err) 784 goto out; 785 786 /* Linux 'w' -> Windows 'ro'. */ 787 if (0222 & inode->i_mode) 788 ni->std_fa &= ~FILE_ATTRIBUTE_READONLY; 789 else 790 ni->std_fa |= FILE_ATTRIBUTE_READONLY; 791 } 792 793 if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE)) 794 ntfs_save_wsl_perm(inode); 795 mark_inode_dirty(inode); 796 out: 797 return err; 798 } 799 800 static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) 801 { 802 struct file *file = iocb->ki_filp; 803 struct inode *inode = file->f_mapping->host; 804 struct ntfs_inode *ni = ntfs_i(inode); 805 806 if (is_encrypted(ni)) { 807 ntfs_inode_warn(inode, "encrypted i/o not supported"); 808 return -EOPNOTSUPP; 809 } 810 811 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) { 812 ntfs_inode_warn(inode, "direct i/o + compressed not supported"); 813 return -EOPNOTSUPP; 814 } 815 816 #ifndef CONFIG_NTFS3_LZX_XPRESS 817 if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) { 818 ntfs_inode_warn( 819 inode, 820 "activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files"); 821 return -EOPNOTSUPP; 822 } 823 #endif 824 825 if (is_dedup(ni)) { 826 ntfs_inode_warn(inode, "read deduplicated not supported"); 827 return -EOPNOTSUPP; 828 } 829 830 return generic_file_read_iter(iocb, iter); 831 } 832 833 /* 834 * ntfs_get_frame_pages 835 * 836 * Return: Array of locked pages. 837 */ 838 static int ntfs_get_frame_pages(struct address_space *mapping, pgoff_t index, 839 struct page **pages, u32 pages_per_frame, 840 bool *frame_uptodate) 841 { 842 gfp_t gfp_mask = mapping_gfp_mask(mapping); 843 u32 npages; 844 845 *frame_uptodate = true; 846 847 for (npages = 0; npages < pages_per_frame; npages++, index++) { 848 struct page *page; 849 850 page = find_or_create_page(mapping, index, gfp_mask); 851 if (!page) { 852 while (npages--) { 853 page = pages[npages]; 854 unlock_page(page); 855 put_page(page); 856 } 857 858 return -ENOMEM; 859 } 860 861 if (!PageUptodate(page)) 862 *frame_uptodate = false; 863 864 pages[npages] = page; 865 } 866 867 return 0; 868 } 869 870 /* 871 * ntfs_compress_write - Helper for ntfs_file_write_iter() (compressed files). 872 */ 873 static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from) 874 { 875 int err; 876 struct file *file = iocb->ki_filp; 877 size_t count = iov_iter_count(from); 878 loff_t pos = iocb->ki_pos; 879 struct inode *inode = file_inode(file); 880 loff_t i_size = inode->i_size; 881 struct address_space *mapping = inode->i_mapping; 882 struct ntfs_inode *ni = ntfs_i(inode); 883 u64 valid = ni->i_valid; 884 struct ntfs_sb_info *sbi = ni->mi.sbi; 885 struct page *page, **pages = NULL; 886 size_t written = 0; 887 u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits; 888 u32 frame_size = 1u << frame_bits; 889 u32 pages_per_frame = frame_size >> PAGE_SHIFT; 890 u32 ip, off; 891 CLST frame; 892 u64 frame_vbo; 893 pgoff_t index; 894 bool frame_uptodate; 895 896 if (frame_size < PAGE_SIZE) { 897 /* 898 * frame_size == 8K if cluster 512 899 * frame_size == 64K if cluster 4096 900 */ 901 ntfs_inode_warn(inode, "page size is bigger than frame size"); 902 return -EOPNOTSUPP; 903 } 904 905 pages = kmalloc_array(pages_per_frame, sizeof(struct page *), GFP_NOFS); 906 if (!pages) 907 return -ENOMEM; 908 909 current->backing_dev_info = inode_to_bdi(inode); 910 err = file_remove_privs(file); 911 if (err) 912 goto out; 913 914 err = file_update_time(file); 915 if (err) 916 goto out; 917 918 /* Zero range [valid : pos). */ 919 while (valid < pos) { 920 CLST lcn, clen; 921 922 frame = valid >> frame_bits; 923 frame_vbo = valid & ~(frame_size - 1); 924 off = valid & (frame_size - 1); 925 926 err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 0, &lcn, 927 &clen, NULL); 928 if (err) 929 goto out; 930 931 if (lcn == SPARSE_LCN) { 932 ni->i_valid = valid = 933 frame_vbo + ((u64)clen << sbi->cluster_bits); 934 continue; 935 } 936 937 /* Load full frame. */ 938 err = ntfs_get_frame_pages(mapping, frame_vbo >> PAGE_SHIFT, 939 pages, pages_per_frame, 940 &frame_uptodate); 941 if (err) 942 goto out; 943 944 if (!frame_uptodate && off) { 945 err = ni_read_frame(ni, frame_vbo, pages, 946 pages_per_frame); 947 if (err) { 948 for (ip = 0; ip < pages_per_frame; ip++) { 949 page = pages[ip]; 950 unlock_page(page); 951 put_page(page); 952 } 953 goto out; 954 } 955 } 956 957 ip = off >> PAGE_SHIFT; 958 off = offset_in_page(valid); 959 for (; ip < pages_per_frame; ip++, off = 0) { 960 page = pages[ip]; 961 zero_user_segment(page, off, PAGE_SIZE); 962 flush_dcache_page(page); 963 SetPageUptodate(page); 964 } 965 966 ni_lock(ni); 967 err = ni_write_frame(ni, pages, pages_per_frame); 968 ni_unlock(ni); 969 970 for (ip = 0; ip < pages_per_frame; ip++) { 971 page = pages[ip]; 972 SetPageUptodate(page); 973 unlock_page(page); 974 put_page(page); 975 } 976 977 if (err) 978 goto out; 979 980 ni->i_valid = valid = frame_vbo + frame_size; 981 } 982 983 /* Copy user data [pos : pos + count). */ 984 while (count) { 985 size_t copied, bytes; 986 987 off = pos & (frame_size - 1); 988 bytes = frame_size - off; 989 if (bytes > count) 990 bytes = count; 991 992 frame = pos >> frame_bits; 993 frame_vbo = pos & ~(frame_size - 1); 994 index = frame_vbo >> PAGE_SHIFT; 995 996 if (unlikely(fault_in_iov_iter_readable(from, bytes))) { 997 err = -EFAULT; 998 goto out; 999 } 1000 1001 /* Load full frame. */ 1002 err = ntfs_get_frame_pages(mapping, index, pages, 1003 pages_per_frame, &frame_uptodate); 1004 if (err) 1005 goto out; 1006 1007 if (!frame_uptodate) { 1008 loff_t to = pos + bytes; 1009 1010 if (off || (to < i_size && (to & (frame_size - 1)))) { 1011 err = ni_read_frame(ni, frame_vbo, pages, 1012 pages_per_frame); 1013 if (err) { 1014 for (ip = 0; ip < pages_per_frame; 1015 ip++) { 1016 page = pages[ip]; 1017 unlock_page(page); 1018 put_page(page); 1019 } 1020 goto out; 1021 } 1022 } 1023 } 1024 1025 WARN_ON(!bytes); 1026 copied = 0; 1027 ip = off >> PAGE_SHIFT; 1028 off = offset_in_page(pos); 1029 1030 /* Copy user data to pages. */ 1031 for (;;) { 1032 size_t cp, tail = PAGE_SIZE - off; 1033 1034 page = pages[ip]; 1035 cp = copy_page_from_iter_atomic(page, off, 1036 min(tail, bytes), from); 1037 flush_dcache_page(page); 1038 1039 copied += cp; 1040 bytes -= cp; 1041 if (!bytes || !cp) 1042 break; 1043 1044 if (cp < tail) { 1045 off += cp; 1046 } else { 1047 ip++; 1048 off = 0; 1049 } 1050 } 1051 1052 ni_lock(ni); 1053 err = ni_write_frame(ni, pages, pages_per_frame); 1054 ni_unlock(ni); 1055 1056 for (ip = 0; ip < pages_per_frame; ip++) { 1057 page = pages[ip]; 1058 ClearPageDirty(page); 1059 SetPageUptodate(page); 1060 unlock_page(page); 1061 put_page(page); 1062 } 1063 1064 if (err) 1065 goto out; 1066 1067 /* 1068 * We can loop for a long time in here. Be nice and allow 1069 * us to schedule out to avoid softlocking if preempt 1070 * is disabled. 1071 */ 1072 cond_resched(); 1073 1074 pos += copied; 1075 written += copied; 1076 1077 count = iov_iter_count(from); 1078 } 1079 1080 out: 1081 kfree(pages); 1082 1083 current->backing_dev_info = NULL; 1084 1085 if (err < 0) 1086 return err; 1087 1088 iocb->ki_pos += written; 1089 if (iocb->ki_pos > ni->i_valid) 1090 ni->i_valid = iocb->ki_pos; 1091 1092 return written; 1093 } 1094 1095 /* 1096 * ntfs_file_write_iter - file_operations::write_iter 1097 */ 1098 static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from) 1099 { 1100 struct file *file = iocb->ki_filp; 1101 struct address_space *mapping = file->f_mapping; 1102 struct inode *inode = mapping->host; 1103 ssize_t ret; 1104 struct ntfs_inode *ni = ntfs_i(inode); 1105 1106 if (is_encrypted(ni)) { 1107 ntfs_inode_warn(inode, "encrypted i/o not supported"); 1108 return -EOPNOTSUPP; 1109 } 1110 1111 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) { 1112 ntfs_inode_warn(inode, "direct i/o + compressed not supported"); 1113 return -EOPNOTSUPP; 1114 } 1115 1116 if (is_dedup(ni)) { 1117 ntfs_inode_warn(inode, "write into deduplicated not supported"); 1118 return -EOPNOTSUPP; 1119 } 1120 1121 if (!inode_trylock(inode)) { 1122 if (iocb->ki_flags & IOCB_NOWAIT) 1123 return -EAGAIN; 1124 inode_lock(inode); 1125 } 1126 1127 ret = generic_write_checks(iocb, from); 1128 if (ret <= 0) 1129 goto out; 1130 1131 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) { 1132 /* Should never be here, see ntfs_file_open(). */ 1133 ret = -EOPNOTSUPP; 1134 goto out; 1135 } 1136 1137 ret = ntfs_extend(inode, iocb->ki_pos, ret, file); 1138 if (ret) 1139 goto out; 1140 1141 ret = is_compressed(ni) ? ntfs_compress_write(iocb, from) 1142 : __generic_file_write_iter(iocb, from); 1143 1144 out: 1145 inode_unlock(inode); 1146 1147 if (ret > 0) 1148 ret = generic_write_sync(iocb, ret); 1149 1150 return ret; 1151 } 1152 1153 /* 1154 * ntfs_file_open - file_operations::open 1155 */ 1156 int ntfs_file_open(struct inode *inode, struct file *file) 1157 { 1158 struct ntfs_inode *ni = ntfs_i(inode); 1159 1160 if (unlikely((is_compressed(ni) || is_encrypted(ni)) && 1161 (file->f_flags & O_DIRECT))) { 1162 return -EOPNOTSUPP; 1163 } 1164 1165 /* Decompress "external compressed" file if opened for rw. */ 1166 if ((ni->ni_flags & NI_FLAG_COMPRESSED_MASK) && 1167 (file->f_flags & (O_WRONLY | O_RDWR | O_TRUNC))) { 1168 #ifdef CONFIG_NTFS3_LZX_XPRESS 1169 int err = ni_decompress_file(ni); 1170 1171 if (err) 1172 return err; 1173 #else 1174 ntfs_inode_warn( 1175 inode, 1176 "activate CONFIG_NTFS3_LZX_XPRESS to write external compressed files"); 1177 return -EOPNOTSUPP; 1178 #endif 1179 } 1180 1181 return generic_file_open(inode, file); 1182 } 1183 1184 /* 1185 * ntfs_file_release - file_operations::release 1186 */ 1187 static int ntfs_file_release(struct inode *inode, struct file *file) 1188 { 1189 struct ntfs_inode *ni = ntfs_i(inode); 1190 struct ntfs_sb_info *sbi = ni->mi.sbi; 1191 int err = 0; 1192 1193 /* If we are last writer on the inode, drop the block reservation. */ 1194 if (sbi->options->prealloc && ((file->f_mode & FMODE_WRITE) && 1195 atomic_read(&inode->i_writecount) == 1)) { 1196 ni_lock(ni); 1197 down_write(&ni->file.run_lock); 1198 1199 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, 1200 inode->i_size, &ni->i_valid, false, NULL); 1201 1202 up_write(&ni->file.run_lock); 1203 ni_unlock(ni); 1204 } 1205 return err; 1206 } 1207 1208 /* 1209 * ntfs_fiemap - file_operations::fiemap 1210 */ 1211 int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1212 __u64 start, __u64 len) 1213 { 1214 int err; 1215 struct ntfs_inode *ni = ntfs_i(inode); 1216 1217 err = fiemap_prep(inode, fieinfo, start, &len, ~FIEMAP_FLAG_XATTR); 1218 if (err) 1219 return err; 1220 1221 ni_lock(ni); 1222 1223 err = ni_fiemap(ni, fieinfo, start, len); 1224 1225 ni_unlock(ni); 1226 1227 return err; 1228 } 1229 1230 // clang-format off 1231 const struct inode_operations ntfs_file_inode_operations = { 1232 .getattr = ntfs_getattr, 1233 .setattr = ntfs3_setattr, 1234 .listxattr = ntfs_listxattr, 1235 .permission = ntfs_permission, 1236 .get_acl = ntfs_get_acl, 1237 .set_acl = ntfs_set_acl, 1238 .fiemap = ntfs_fiemap, 1239 }; 1240 1241 const struct file_operations ntfs_file_operations = { 1242 .llseek = generic_file_llseek, 1243 .read_iter = ntfs_file_read_iter, 1244 .write_iter = ntfs_file_write_iter, 1245 .unlocked_ioctl = ntfs_ioctl, 1246 #ifdef CONFIG_COMPAT 1247 .compat_ioctl = ntfs_compat_ioctl, 1248 #endif 1249 .splice_read = generic_file_splice_read, 1250 .mmap = ntfs_file_mmap, 1251 .open = ntfs_file_open, 1252 .fsync = generic_file_fsync, 1253 .splice_write = iter_file_splice_write, 1254 .fallocate = ntfs_fallocate, 1255 .release = ntfs_file_release, 1256 }; 1257 // clang-format on 1258