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 page *page; 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 page = find_or_create_page(mapping, idx, 199 mapping_gfp_constraint(mapping, 200 ~__GFP_FS)); 201 if (!page) 202 return -ENOMEM; 203 204 if (!page_has_buffers(page)) 205 create_empty_buffers(page, blocksize, 0); 206 207 bh = head = page_buffers(page); 208 bh_off = 0; 209 do { 210 bh_next = bh_off + blocksize; 211 212 if (bh_next <= from || bh_off >= to) 213 continue; 214 215 if (!buffer_mapped(bh)) { 216 ntfs_get_block(inode, iblock, bh, 0); 217 /* Unmapped? It's a hole - nothing to do. */ 218 if (!buffer_mapped(bh)) 219 continue; 220 } 221 222 /* Ok, it's mapped. Make sure it's up-to-date. */ 223 if (PageUptodate(page)) 224 set_buffer_uptodate(bh); 225 226 if (!buffer_uptodate(bh)) { 227 err = bh_read(bh, 0); 228 if (err < 0) { 229 unlock_page(page); 230 put_page(page); 231 goto out; 232 } 233 } 234 235 mark_buffer_dirty(bh); 236 237 } while (bh_off = bh_next, iblock += 1, 238 head != (bh = bh->b_this_page)); 239 240 zero_user_segment(page, from, to); 241 242 unlock_page(page); 243 put_page(page); 244 cond_resched(); 245 } 246 out: 247 mark_inode_dirty(inode); 248 return err; 249 } 250 251 /* 252 * ntfs_file_mmap - file_operations::mmap 253 */ 254 static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma) 255 { 256 struct address_space *mapping = file->f_mapping; 257 struct inode *inode = mapping->host; 258 struct ntfs_inode *ni = ntfs_i(inode); 259 u64 from = ((u64)vma->vm_pgoff << PAGE_SHIFT); 260 bool rw = vma->vm_flags & VM_WRITE; 261 int err; 262 263 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 264 return -EIO; 265 266 if (is_encrypted(ni)) { 267 ntfs_inode_warn(inode, "mmap encrypted not supported"); 268 return -EOPNOTSUPP; 269 } 270 271 if (is_dedup(ni)) { 272 ntfs_inode_warn(inode, "mmap deduplicated not supported"); 273 return -EOPNOTSUPP; 274 } 275 276 if (is_compressed(ni) && rw) { 277 ntfs_inode_warn(inode, "mmap(write) compressed not supported"); 278 return -EOPNOTSUPP; 279 } 280 281 if (rw) { 282 u64 to = min_t(loff_t, i_size_read(inode), 283 from + vma->vm_end - vma->vm_start); 284 285 if (is_sparsed(ni)) { 286 /* Allocate clusters for rw map. */ 287 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 288 CLST lcn, len; 289 CLST vcn = from >> sbi->cluster_bits; 290 CLST end = bytes_to_cluster(sbi, to); 291 bool new; 292 293 for (; vcn < end; vcn += len) { 294 err = attr_data_get_block(ni, vcn, 1, &lcn, 295 &len, &new, true); 296 if (err) 297 goto out; 298 } 299 } 300 301 if (ni->i_valid < to) { 302 if (!inode_trylock(inode)) { 303 err = -EAGAIN; 304 goto out; 305 } 306 err = ntfs_extend_initialized_size(file, ni, 307 ni->i_valid, to); 308 inode_unlock(inode); 309 if (err) 310 goto out; 311 } 312 } 313 314 err = generic_file_mmap(file, vma); 315 out: 316 return err; 317 } 318 319 static int ntfs_extend(struct inode *inode, loff_t pos, size_t count, 320 struct file *file) 321 { 322 struct ntfs_inode *ni = ntfs_i(inode); 323 struct address_space *mapping = inode->i_mapping; 324 loff_t end = pos + count; 325 bool extend_init = file && pos > ni->i_valid; 326 int err; 327 328 if (end <= inode->i_size && !extend_init) 329 return 0; 330 331 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 332 ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY); 333 334 if (end > inode->i_size) { 335 err = ntfs_set_size(inode, end); 336 if (err) 337 goto out; 338 } 339 340 if (extend_init && !is_compressed(ni)) { 341 err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos); 342 if (err) 343 goto out; 344 } else { 345 err = 0; 346 } 347 348 inode->i_mtime = inode_set_ctime_current(inode); 349 mark_inode_dirty(inode); 350 351 if (IS_SYNC(inode)) { 352 int err2; 353 354 err = filemap_fdatawrite_range(mapping, pos, end - 1); 355 err2 = sync_mapping_buffers(mapping); 356 if (!err) 357 err = err2; 358 err2 = write_inode_now(inode, 1); 359 if (!err) 360 err = err2; 361 if (!err) 362 err = filemap_fdatawait_range(mapping, pos, end - 1); 363 } 364 365 out: 366 return err; 367 } 368 369 static int ntfs_truncate(struct inode *inode, loff_t new_size) 370 { 371 struct super_block *sb = inode->i_sb; 372 struct ntfs_inode *ni = ntfs_i(inode); 373 int err, dirty = 0; 374 u64 new_valid; 375 376 if (!S_ISREG(inode->i_mode)) 377 return 0; 378 379 if (is_compressed(ni)) { 380 if (ni->i_valid > new_size) 381 ni->i_valid = new_size; 382 } else { 383 err = block_truncate_page(inode->i_mapping, new_size, 384 ntfs_get_block); 385 if (err) 386 return err; 387 } 388 389 new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size)); 390 391 truncate_setsize(inode, new_size); 392 393 ni_lock(ni); 394 395 down_write(&ni->file.run_lock); 396 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 397 &new_valid, ni->mi.sbi->options->prealloc, NULL); 398 up_write(&ni->file.run_lock); 399 400 if (new_valid < ni->i_valid) 401 ni->i_valid = new_valid; 402 403 ni_unlock(ni); 404 405 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 406 inode->i_mtime = inode_set_ctime_current(inode); 407 if (!IS_DIRSYNC(inode)) { 408 dirty = 1; 409 } else { 410 err = ntfs_sync_inode(inode); 411 if (err) 412 return err; 413 } 414 415 if (dirty) 416 mark_inode_dirty(inode); 417 418 /*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/ 419 420 return 0; 421 } 422 423 /* 424 * ntfs_fallocate 425 * 426 * Preallocate space for a file. This implements ntfs's fallocate file 427 * operation, which gets called from sys_fallocate system call. User 428 * space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set 429 * we just allocate clusters without zeroing them out. Otherwise we 430 * allocate and zero out clusters via an expanding truncate. 431 */ 432 static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len) 433 { 434 struct inode *inode = file->f_mapping->host; 435 struct address_space *mapping = inode->i_mapping; 436 struct super_block *sb = inode->i_sb; 437 struct ntfs_sb_info *sbi = sb->s_fs_info; 438 struct ntfs_inode *ni = ntfs_i(inode); 439 loff_t end = vbo + len; 440 loff_t vbo_down = round_down(vbo, max_t(unsigned long, 441 sbi->cluster_size, PAGE_SIZE)); 442 bool is_supported_holes = is_sparsed(ni) || is_compressed(ni); 443 loff_t i_size, new_size; 444 bool map_locked; 445 int err; 446 447 /* No support for dir. */ 448 if (!S_ISREG(inode->i_mode)) 449 return -EOPNOTSUPP; 450 451 /* 452 * vfs_fallocate checks all possible combinations of mode. 453 * Do additional checks here before ntfs_set_state(dirty). 454 */ 455 if (mode & FALLOC_FL_PUNCH_HOLE) { 456 if (!is_supported_holes) 457 return -EOPNOTSUPP; 458 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) { 459 } else if (mode & FALLOC_FL_INSERT_RANGE) { 460 if (!is_supported_holes) 461 return -EOPNOTSUPP; 462 } else if (mode & 463 ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | 464 FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)) { 465 ntfs_inode_warn(inode, "fallocate(0x%x) is not supported", 466 mode); 467 return -EOPNOTSUPP; 468 } 469 470 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 471 472 inode_lock(inode); 473 i_size = inode->i_size; 474 new_size = max(end, i_size); 475 map_locked = false; 476 477 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) { 478 /* Should never be here, see ntfs_file_open. */ 479 err = -EOPNOTSUPP; 480 goto out; 481 } 482 483 if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE | 484 FALLOC_FL_INSERT_RANGE)) { 485 inode_dio_wait(inode); 486 filemap_invalidate_lock(mapping); 487 map_locked = true; 488 } 489 490 if (mode & FALLOC_FL_PUNCH_HOLE) { 491 u32 frame_size; 492 loff_t mask, vbo_a, end_a, tmp; 493 494 err = filemap_write_and_wait_range(mapping, vbo_down, 495 LLONG_MAX); 496 if (err) 497 goto out; 498 499 truncate_pagecache(inode, vbo_down); 500 501 ni_lock(ni); 502 err = attr_punch_hole(ni, vbo, len, &frame_size); 503 ni_unlock(ni); 504 if (!err) 505 goto ok; 506 507 if (err != E_NTFS_NOTALIGNED) 508 goto out; 509 510 /* Process not aligned punch. */ 511 err = 0; 512 mask = frame_size - 1; 513 vbo_a = (vbo + mask) & ~mask; 514 end_a = end & ~mask; 515 516 tmp = min(vbo_a, end); 517 if (tmp > vbo) { 518 err = ntfs_zero_range(inode, vbo, tmp); 519 if (err) 520 goto out; 521 } 522 523 if (vbo < end_a && end_a < end) { 524 err = ntfs_zero_range(inode, end_a, end); 525 if (err) 526 goto out; 527 } 528 529 /* Aligned punch_hole */ 530 if (end_a > vbo_a) { 531 ni_lock(ni); 532 err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL); 533 ni_unlock(ni); 534 if (err) 535 goto out; 536 } 537 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) { 538 /* 539 * Write tail of the last page before removed range since 540 * it will get removed from the page cache below. 541 */ 542 err = filemap_write_and_wait_range(mapping, vbo_down, vbo); 543 if (err) 544 goto out; 545 546 /* 547 * Write data that will be shifted to preserve them 548 * when discarding page cache below. 549 */ 550 err = filemap_write_and_wait_range(mapping, end, LLONG_MAX); 551 if (err) 552 goto out; 553 554 truncate_pagecache(inode, vbo_down); 555 556 ni_lock(ni); 557 err = attr_collapse_range(ni, vbo, len); 558 ni_unlock(ni); 559 } else if (mode & FALLOC_FL_INSERT_RANGE) { 560 /* Check new size. */ 561 err = inode_newsize_ok(inode, new_size); 562 if (err) 563 goto out; 564 565 /* Write out all dirty pages. */ 566 err = filemap_write_and_wait_range(mapping, vbo_down, 567 LLONG_MAX); 568 if (err) 569 goto out; 570 truncate_pagecache(inode, vbo_down); 571 572 ni_lock(ni); 573 err = attr_insert_range(ni, vbo, len); 574 ni_unlock(ni); 575 if (err) 576 goto out; 577 } else { 578 /* Check new size. */ 579 u8 cluster_bits = sbi->cluster_bits; 580 581 /* generic/213: expected -ENOSPC instead of -EFBIG. */ 582 if (!is_supported_holes) { 583 loff_t to_alloc = new_size - inode_get_bytes(inode); 584 585 if (to_alloc > 0 && 586 (to_alloc >> cluster_bits) > 587 wnd_zeroes(&sbi->used.bitmap)) { 588 err = -ENOSPC; 589 goto out; 590 } 591 } 592 593 err = inode_newsize_ok(inode, new_size); 594 if (err) 595 goto out; 596 597 if (new_size > i_size) { 598 /* 599 * Allocate clusters, do not change 'valid' size. 600 */ 601 err = ntfs_set_size(inode, new_size); 602 if (err) 603 goto out; 604 } 605 606 if (is_supported_holes) { 607 CLST vcn = vbo >> cluster_bits; 608 CLST cend = bytes_to_cluster(sbi, end); 609 CLST cend_v = bytes_to_cluster(sbi, ni->i_valid); 610 CLST lcn, clen; 611 bool new; 612 613 if (cend_v > cend) 614 cend_v = cend; 615 616 /* 617 * Allocate and zero new clusters. 618 * Zeroing these clusters may be too long. 619 */ 620 for (; vcn < cend_v; vcn += clen) { 621 err = attr_data_get_block(ni, vcn, cend_v - vcn, 622 &lcn, &clen, &new, 623 true); 624 if (err) 625 goto out; 626 } 627 /* 628 * Allocate but not zero new clusters. 629 */ 630 for (; vcn < cend; vcn += clen) { 631 err = attr_data_get_block(ni, vcn, cend - vcn, 632 &lcn, &clen, &new, 633 false); 634 if (err) 635 goto out; 636 } 637 } 638 639 if (mode & FALLOC_FL_KEEP_SIZE) { 640 ni_lock(ni); 641 /* True - Keep preallocated. */ 642 err = attr_set_size(ni, ATTR_DATA, NULL, 0, 643 &ni->file.run, i_size, &ni->i_valid, 644 true, NULL); 645 ni_unlock(ni); 646 if (err) 647 goto out; 648 } else if (new_size > i_size) { 649 i_size_write(inode, new_size); 650 } 651 } 652 653 ok: 654 err = file_modified(file); 655 if (err) 656 goto out; 657 658 out: 659 if (map_locked) 660 filemap_invalidate_unlock(mapping); 661 662 if (!err) { 663 inode->i_mtime = inode_set_ctime_current(inode); 664 mark_inode_dirty(inode); 665 } 666 667 inode_unlock(inode); 668 return err; 669 } 670 671 /* 672 * ntfs3_setattr - inode_operations::setattr 673 */ 674 int ntfs3_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 675 struct iattr *attr) 676 { 677 struct inode *inode = d_inode(dentry); 678 struct ntfs_inode *ni = ntfs_i(inode); 679 u32 ia_valid = attr->ia_valid; 680 umode_t mode = inode->i_mode; 681 int err; 682 683 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 684 return -EIO; 685 686 err = setattr_prepare(idmap, dentry, attr); 687 if (err) 688 goto out; 689 690 if (ia_valid & ATTR_SIZE) { 691 loff_t newsize, oldsize; 692 693 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) { 694 /* Should never be here, see ntfs_file_open(). */ 695 err = -EOPNOTSUPP; 696 goto out; 697 } 698 inode_dio_wait(inode); 699 oldsize = i_size_read(inode); 700 newsize = attr->ia_size; 701 702 if (newsize <= oldsize) 703 err = ntfs_truncate(inode, newsize); 704 else 705 err = ntfs_extend(inode, newsize, 0, NULL); 706 707 if (err) 708 goto out; 709 710 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 711 i_size_write(inode, newsize); 712 } 713 714 setattr_copy(idmap, inode, attr); 715 716 if (mode != inode->i_mode) { 717 err = ntfs_acl_chmod(idmap, dentry); 718 if (err) 719 goto out; 720 721 /* Linux 'w' -> Windows 'ro'. */ 722 if (0222 & inode->i_mode) 723 ni->std_fa &= ~FILE_ATTRIBUTE_READONLY; 724 else 725 ni->std_fa |= FILE_ATTRIBUTE_READONLY; 726 } 727 728 if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE)) 729 ntfs_save_wsl_perm(inode, NULL); 730 mark_inode_dirty(inode); 731 out: 732 return err; 733 } 734 735 static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) 736 { 737 struct file *file = iocb->ki_filp; 738 struct inode *inode = file->f_mapping->host; 739 struct ntfs_inode *ni = ntfs_i(inode); 740 741 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 742 return -EIO; 743 744 if (is_encrypted(ni)) { 745 ntfs_inode_warn(inode, "encrypted i/o not supported"); 746 return -EOPNOTSUPP; 747 } 748 749 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) { 750 ntfs_inode_warn(inode, "direct i/o + compressed not supported"); 751 return -EOPNOTSUPP; 752 } 753 754 #ifndef CONFIG_NTFS3_LZX_XPRESS 755 if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) { 756 ntfs_inode_warn( 757 inode, 758 "activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files"); 759 return -EOPNOTSUPP; 760 } 761 #endif 762 763 if (is_dedup(ni)) { 764 ntfs_inode_warn(inode, "read deduplicated not supported"); 765 return -EOPNOTSUPP; 766 } 767 768 return generic_file_read_iter(iocb, iter); 769 } 770 771 static ssize_t ntfs_file_splice_read(struct file *in, loff_t *ppos, 772 struct pipe_inode_info *pipe, size_t len, 773 unsigned int flags) 774 { 775 struct inode *inode = in->f_mapping->host; 776 struct ntfs_inode *ni = ntfs_i(inode); 777 778 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 779 return -EIO; 780 781 if (is_encrypted(ni)) { 782 ntfs_inode_warn(inode, "encrypted i/o not supported"); 783 return -EOPNOTSUPP; 784 } 785 786 #ifndef CONFIG_NTFS3_LZX_XPRESS 787 if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) { 788 ntfs_inode_warn( 789 inode, 790 "activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files"); 791 return -EOPNOTSUPP; 792 } 793 #endif 794 795 if (is_dedup(ni)) { 796 ntfs_inode_warn(inode, "read deduplicated not supported"); 797 return -EOPNOTSUPP; 798 } 799 800 return filemap_splice_read(in, ppos, pipe, len, flags); 801 } 802 803 /* 804 * ntfs_get_frame_pages 805 * 806 * Return: Array of locked pages. 807 */ 808 static int ntfs_get_frame_pages(struct address_space *mapping, pgoff_t index, 809 struct page **pages, u32 pages_per_frame, 810 bool *frame_uptodate) 811 { 812 gfp_t gfp_mask = mapping_gfp_mask(mapping); 813 u32 npages; 814 815 *frame_uptodate = true; 816 817 for (npages = 0; npages < pages_per_frame; npages++, index++) { 818 struct page *page; 819 820 page = find_or_create_page(mapping, index, gfp_mask); 821 if (!page) { 822 while (npages--) { 823 page = pages[npages]; 824 unlock_page(page); 825 put_page(page); 826 } 827 828 return -ENOMEM; 829 } 830 831 if (!PageUptodate(page)) 832 *frame_uptodate = false; 833 834 pages[npages] = page; 835 } 836 837 return 0; 838 } 839 840 /* 841 * ntfs_compress_write - Helper for ntfs_file_write_iter() (compressed files). 842 */ 843 static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from) 844 { 845 int err; 846 struct file *file = iocb->ki_filp; 847 size_t count = iov_iter_count(from); 848 loff_t pos = iocb->ki_pos; 849 struct inode *inode = file_inode(file); 850 loff_t i_size = i_size_read(inode); 851 struct address_space *mapping = inode->i_mapping; 852 struct ntfs_inode *ni = ntfs_i(inode); 853 u64 valid = ni->i_valid; 854 struct ntfs_sb_info *sbi = ni->mi.sbi; 855 struct page *page, **pages = NULL; 856 size_t written = 0; 857 u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits; 858 u32 frame_size = 1u << frame_bits; 859 u32 pages_per_frame = frame_size >> PAGE_SHIFT; 860 u32 ip, off; 861 CLST frame; 862 u64 frame_vbo; 863 pgoff_t index; 864 bool frame_uptodate; 865 866 if (frame_size < PAGE_SIZE) { 867 /* 868 * frame_size == 8K if cluster 512 869 * frame_size == 64K if cluster 4096 870 */ 871 ntfs_inode_warn(inode, "page size is bigger than frame size"); 872 return -EOPNOTSUPP; 873 } 874 875 pages = kmalloc_array(pages_per_frame, sizeof(struct page *), GFP_NOFS); 876 if (!pages) 877 return -ENOMEM; 878 879 err = file_remove_privs(file); 880 if (err) 881 goto out; 882 883 err = file_update_time(file); 884 if (err) 885 goto out; 886 887 /* Zero range [valid : pos). */ 888 while (valid < pos) { 889 CLST lcn, clen; 890 891 frame = valid >> frame_bits; 892 frame_vbo = valid & ~(frame_size - 1); 893 off = valid & (frame_size - 1); 894 895 err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 1, &lcn, 896 &clen, NULL, false); 897 if (err) 898 goto out; 899 900 if (lcn == SPARSE_LCN) { 901 ni->i_valid = valid = 902 frame_vbo + ((u64)clen << sbi->cluster_bits); 903 continue; 904 } 905 906 /* Load full frame. */ 907 err = ntfs_get_frame_pages(mapping, frame_vbo >> PAGE_SHIFT, 908 pages, pages_per_frame, 909 &frame_uptodate); 910 if (err) 911 goto out; 912 913 if (!frame_uptodate && off) { 914 err = ni_read_frame(ni, frame_vbo, pages, 915 pages_per_frame); 916 if (err) { 917 for (ip = 0; ip < pages_per_frame; ip++) { 918 page = pages[ip]; 919 unlock_page(page); 920 put_page(page); 921 } 922 goto out; 923 } 924 } 925 926 ip = off >> PAGE_SHIFT; 927 off = offset_in_page(valid); 928 for (; ip < pages_per_frame; ip++, off = 0) { 929 page = pages[ip]; 930 zero_user_segment(page, off, PAGE_SIZE); 931 flush_dcache_page(page); 932 SetPageUptodate(page); 933 } 934 935 ni_lock(ni); 936 err = ni_write_frame(ni, pages, pages_per_frame); 937 ni_unlock(ni); 938 939 for (ip = 0; ip < pages_per_frame; ip++) { 940 page = pages[ip]; 941 SetPageUptodate(page); 942 unlock_page(page); 943 put_page(page); 944 } 945 946 if (err) 947 goto out; 948 949 ni->i_valid = valid = frame_vbo + frame_size; 950 } 951 952 /* Copy user data [pos : pos + count). */ 953 while (count) { 954 size_t copied, bytes; 955 956 off = pos & (frame_size - 1); 957 bytes = frame_size - off; 958 if (bytes > count) 959 bytes = count; 960 961 frame_vbo = pos & ~(frame_size - 1); 962 index = frame_vbo >> PAGE_SHIFT; 963 964 if (unlikely(fault_in_iov_iter_readable(from, bytes))) { 965 err = -EFAULT; 966 goto out; 967 } 968 969 /* Load full frame. */ 970 err = ntfs_get_frame_pages(mapping, index, pages, 971 pages_per_frame, &frame_uptodate); 972 if (err) 973 goto out; 974 975 if (!frame_uptodate) { 976 loff_t to = pos + bytes; 977 978 if (off || (to < i_size && (to & (frame_size - 1)))) { 979 err = ni_read_frame(ni, frame_vbo, pages, 980 pages_per_frame); 981 if (err) { 982 for (ip = 0; ip < pages_per_frame; 983 ip++) { 984 page = pages[ip]; 985 unlock_page(page); 986 put_page(page); 987 } 988 goto out; 989 } 990 } 991 } 992 993 WARN_ON(!bytes); 994 copied = 0; 995 ip = off >> PAGE_SHIFT; 996 off = offset_in_page(pos); 997 998 /* Copy user data to pages. */ 999 for (;;) { 1000 size_t cp, tail = PAGE_SIZE - off; 1001 1002 page = pages[ip]; 1003 cp = copy_page_from_iter_atomic(page, off, 1004 min(tail, bytes), from); 1005 flush_dcache_page(page); 1006 1007 copied += cp; 1008 bytes -= cp; 1009 if (!bytes || !cp) 1010 break; 1011 1012 if (cp < tail) { 1013 off += cp; 1014 } else { 1015 ip++; 1016 off = 0; 1017 } 1018 } 1019 1020 ni_lock(ni); 1021 err = ni_write_frame(ni, pages, pages_per_frame); 1022 ni_unlock(ni); 1023 1024 for (ip = 0; ip < pages_per_frame; ip++) { 1025 page = pages[ip]; 1026 ClearPageDirty(page); 1027 SetPageUptodate(page); 1028 unlock_page(page); 1029 put_page(page); 1030 } 1031 1032 if (err) 1033 goto out; 1034 1035 /* 1036 * We can loop for a long time in here. Be nice and allow 1037 * us to schedule out to avoid softlocking if preempt 1038 * is disabled. 1039 */ 1040 cond_resched(); 1041 1042 pos += copied; 1043 written += copied; 1044 1045 count = iov_iter_count(from); 1046 } 1047 1048 out: 1049 kfree(pages); 1050 1051 if (err < 0) 1052 return err; 1053 1054 iocb->ki_pos += written; 1055 if (iocb->ki_pos > ni->i_valid) 1056 ni->i_valid = iocb->ki_pos; 1057 if (iocb->ki_pos > i_size) 1058 i_size_write(inode, iocb->ki_pos); 1059 1060 return written; 1061 } 1062 1063 /* 1064 * ntfs_file_write_iter - file_operations::write_iter 1065 */ 1066 static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from) 1067 { 1068 struct file *file = iocb->ki_filp; 1069 struct address_space *mapping = file->f_mapping; 1070 struct inode *inode = mapping->host; 1071 ssize_t ret; 1072 int err; 1073 struct ntfs_inode *ni = ntfs_i(inode); 1074 1075 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 1076 return -EIO; 1077 1078 if (is_encrypted(ni)) { 1079 ntfs_inode_warn(inode, "encrypted i/o not supported"); 1080 return -EOPNOTSUPP; 1081 } 1082 1083 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) { 1084 ntfs_inode_warn(inode, "direct i/o + compressed not supported"); 1085 return -EOPNOTSUPP; 1086 } 1087 1088 if (is_dedup(ni)) { 1089 ntfs_inode_warn(inode, "write into deduplicated not supported"); 1090 return -EOPNOTSUPP; 1091 } 1092 1093 if (!inode_trylock(inode)) { 1094 if (iocb->ki_flags & IOCB_NOWAIT) 1095 return -EAGAIN; 1096 inode_lock(inode); 1097 } 1098 1099 ret = generic_write_checks(iocb, from); 1100 if (ret <= 0) 1101 goto out; 1102 1103 err = file_modified(iocb->ki_filp); 1104 if (err) { 1105 ret = err; 1106 goto out; 1107 } 1108 1109 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) { 1110 /* Should never be here, see ntfs_file_open(). */ 1111 ret = -EOPNOTSUPP; 1112 goto out; 1113 } 1114 1115 ret = ntfs_extend(inode, iocb->ki_pos, ret, file); 1116 if (ret) 1117 goto out; 1118 1119 ret = is_compressed(ni) ? ntfs_compress_write(iocb, from) : 1120 __generic_file_write_iter(iocb, from); 1121 1122 out: 1123 inode_unlock(inode); 1124 1125 if (ret > 0) 1126 ret = generic_write_sync(iocb, ret); 1127 1128 return ret; 1129 } 1130 1131 /* 1132 * ntfs_file_open - file_operations::open 1133 */ 1134 int ntfs_file_open(struct inode *inode, struct file *file) 1135 { 1136 struct ntfs_inode *ni = ntfs_i(inode); 1137 1138 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 1139 return -EIO; 1140 1141 if (unlikely((is_compressed(ni) || is_encrypted(ni)) && 1142 (file->f_flags & O_DIRECT))) { 1143 return -EOPNOTSUPP; 1144 } 1145 1146 /* Decompress "external compressed" file if opened for rw. */ 1147 if ((ni->ni_flags & NI_FLAG_COMPRESSED_MASK) && 1148 (file->f_flags & (O_WRONLY | O_RDWR | O_TRUNC))) { 1149 #ifdef CONFIG_NTFS3_LZX_XPRESS 1150 int err = ni_decompress_file(ni); 1151 1152 if (err) 1153 return err; 1154 #else 1155 ntfs_inode_warn( 1156 inode, 1157 "activate CONFIG_NTFS3_LZX_XPRESS to write external compressed files"); 1158 return -EOPNOTSUPP; 1159 #endif 1160 } 1161 1162 return generic_file_open(inode, file); 1163 } 1164 1165 /* 1166 * ntfs_file_release - file_operations::release 1167 */ 1168 static int ntfs_file_release(struct inode *inode, struct file *file) 1169 { 1170 struct ntfs_inode *ni = ntfs_i(inode); 1171 struct ntfs_sb_info *sbi = ni->mi.sbi; 1172 int err = 0; 1173 1174 /* If we are last writer on the inode, drop the block reservation. */ 1175 if (sbi->options->prealloc && 1176 ((file->f_mode & FMODE_WRITE) && 1177 atomic_read(&inode->i_writecount) == 1)) { 1178 ni_lock(ni); 1179 down_write(&ni->file.run_lock); 1180 1181 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, 1182 i_size_read(inode), &ni->i_valid, false, 1183 NULL); 1184 1185 up_write(&ni->file.run_lock); 1186 ni_unlock(ni); 1187 } 1188 return err; 1189 } 1190 1191 /* 1192 * ntfs_fiemap - file_operations::fiemap 1193 */ 1194 int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1195 __u64 start, __u64 len) 1196 { 1197 int err; 1198 struct ntfs_inode *ni = ntfs_i(inode); 1199 1200 err = fiemap_prep(inode, fieinfo, start, &len, ~FIEMAP_FLAG_XATTR); 1201 if (err) 1202 return err; 1203 1204 ni_lock(ni); 1205 1206 err = ni_fiemap(ni, fieinfo, start, len); 1207 1208 ni_unlock(ni); 1209 1210 return err; 1211 } 1212 1213 // clang-format off 1214 const struct inode_operations ntfs_file_inode_operations = { 1215 .getattr = ntfs_getattr, 1216 .setattr = ntfs3_setattr, 1217 .listxattr = ntfs_listxattr, 1218 .get_acl = ntfs_get_acl, 1219 .set_acl = ntfs_set_acl, 1220 .fiemap = ntfs_fiemap, 1221 }; 1222 1223 const struct file_operations ntfs_file_operations = { 1224 .llseek = generic_file_llseek, 1225 .read_iter = ntfs_file_read_iter, 1226 .write_iter = ntfs_file_write_iter, 1227 .unlocked_ioctl = ntfs_ioctl, 1228 #ifdef CONFIG_COMPAT 1229 .compat_ioctl = ntfs_compat_ioctl, 1230 #endif 1231 .splice_read = ntfs_file_splice_read, 1232 .mmap = ntfs_file_mmap, 1233 .open = ntfs_file_open, 1234 .fsync = generic_file_fsync, 1235 .splice_write = iter_file_splice_write, 1236 .fallocate = ntfs_fallocate, 1237 .release = ntfs_file_release, 1238 }; 1239 // clang-format on 1240