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