1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 *
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
5 *
6 * Regular file handling primitives for NTFS-based filesystems.
7 *
8 */
9
10 #include <linux/backing-dev.h>
11 #include <linux/buffer_head.h>
12 #include <linux/compat.h>
13 #include <linux/falloc.h>
14 #include <linux/fiemap.h>
15
16 #include "debug.h"
17 #include "ntfs.h"
18 #include "ntfs_fs.h"
19
ntfs_ioctl_fitrim(struct ntfs_sb_info * sbi,unsigned long arg)20 static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
21 {
22 struct fstrim_range __user *user_range;
23 struct fstrim_range range;
24 struct request_queue *q = bdev_get_queue(sbi->sb->s_bdev);
25 int err;
26
27 if (!capable(CAP_SYS_ADMIN))
28 return -EPERM;
29
30 if (!blk_queue_discard(q))
31 return -EOPNOTSUPP;
32
33 user_range = (struct fstrim_range __user *)arg;
34 if (copy_from_user(&range, user_range, sizeof(range)))
35 return -EFAULT;
36
37 range.minlen = max_t(u32, range.minlen, q->limits.discard_granularity);
38
39 err = ntfs_trim_fs(sbi, &range);
40 if (err < 0)
41 return err;
42
43 if (copy_to_user(user_range, &range, sizeof(range)))
44 return -EFAULT;
45
46 return 0;
47 }
48
ntfs_ioctl(struct file * filp,u32 cmd,unsigned long arg)49 static long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg)
50 {
51 struct inode *inode = file_inode(filp);
52 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
53
54 switch (cmd) {
55 case FITRIM:
56 return ntfs_ioctl_fitrim(sbi, arg);
57 }
58 return -ENOTTY; /* Inappropriate ioctl for device. */
59 }
60
61 #ifdef CONFIG_COMPAT
ntfs_compat_ioctl(struct file * filp,u32 cmd,unsigned long arg)62 static long ntfs_compat_ioctl(struct file *filp, u32 cmd, unsigned long arg)
63
64 {
65 return ntfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
66 }
67 #endif
68
69 /*
70 * ntfs_getattr - inode_operations::getattr
71 */
ntfs_getattr(struct user_namespace * mnt_userns,const struct path * path,struct kstat * stat,u32 request_mask,u32 flags)72 int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
73 struct kstat *stat, u32 request_mask, u32 flags)
74 {
75 struct inode *inode = d_inode(path->dentry);
76 struct ntfs_inode *ni = ntfs_i(inode);
77
78 if (is_compressed(ni))
79 stat->attributes |= STATX_ATTR_COMPRESSED;
80
81 if (is_encrypted(ni))
82 stat->attributes |= STATX_ATTR_ENCRYPTED;
83
84 stat->attributes_mask |= STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED;
85
86 generic_fillattr(mnt_userns, inode, stat);
87
88 stat->result_mask |= STATX_BTIME;
89 stat->btime = ni->i_crtime;
90 stat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */
91
92 return 0;
93 }
94
ntfs_extend_initialized_size(struct file * file,struct ntfs_inode * ni,const loff_t valid,const loff_t new_valid)95 static int ntfs_extend_initialized_size(struct file *file,
96 struct ntfs_inode *ni,
97 const loff_t valid,
98 const loff_t new_valid)
99 {
100 struct inode *inode = &ni->vfs_inode;
101 struct address_space *mapping = inode->i_mapping;
102 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
103 loff_t pos = valid;
104 int err;
105
106 if (is_resident(ni)) {
107 ni->i_valid = new_valid;
108 return 0;
109 }
110
111 WARN_ON(is_compressed(ni));
112 WARN_ON(valid >= new_valid);
113
114 for (;;) {
115 u32 zerofrom, len;
116 struct page *page;
117 void *fsdata;
118 u8 bits;
119 CLST vcn, lcn, clen;
120
121 if (is_sparsed(ni)) {
122 bits = sbi->cluster_bits;
123 vcn = pos >> bits;
124
125 err = attr_data_get_block(ni, vcn, 0, &lcn, &clen,
126 NULL);
127 if (err)
128 goto out;
129
130 if (lcn == SPARSE_LCN) {
131 loff_t vbo = (loff_t)vcn << bits;
132 loff_t to = vbo + ((loff_t)clen << bits);
133
134 if (to <= new_valid) {
135 ni->i_valid = to;
136 pos = to;
137 goto next;
138 }
139
140 if (vbo < pos) {
141 pos = vbo;
142 } else {
143 to = (new_valid >> bits) << bits;
144 if (pos < to) {
145 ni->i_valid = to;
146 pos = to;
147 goto next;
148 }
149 }
150 }
151 }
152
153 zerofrom = pos & (PAGE_SIZE - 1);
154 len = PAGE_SIZE - zerofrom;
155
156 if (pos + len > new_valid)
157 len = new_valid - pos;
158
159 err = pagecache_write_begin(file, mapping, pos, len, 0, &page,
160 &fsdata);
161 if (err)
162 goto out;
163
164 zero_user_segment(page, zerofrom, PAGE_SIZE);
165
166 /* This function in any case puts page. */
167 err = pagecache_write_end(file, mapping, pos, len, len, page,
168 fsdata);
169 if (err < 0)
170 goto out;
171 pos += len;
172
173 next:
174 if (pos >= new_valid)
175 break;
176
177 balance_dirty_pages_ratelimited(mapping);
178 cond_resched();
179 }
180
181 return 0;
182
183 out:
184 ni->i_valid = valid;
185 ntfs_inode_warn(inode, "failed to extend initialized size to %llx.",
186 new_valid);
187 return err;
188 }
189
190 /*
191 * ntfs_zero_range - Helper function for punch_hole.
192 *
193 * It zeroes a range [vbo, vbo_to).
194 */
ntfs_zero_range(struct inode * inode,u64 vbo,u64 vbo_to)195 static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
196 {
197 int err = 0;
198 struct address_space *mapping = inode->i_mapping;
199 u32 blocksize = 1 << inode->i_blkbits;
200 pgoff_t idx = vbo >> PAGE_SHIFT;
201 u32 z_start = vbo & (PAGE_SIZE - 1);
202 pgoff_t idx_end = (vbo_to + PAGE_SIZE - 1) >> PAGE_SHIFT;
203 loff_t page_off;
204 struct buffer_head *head, *bh;
205 u32 bh_next, bh_off, z_end;
206 sector_t iblock;
207 struct page *page;
208
209 for (; idx < idx_end; idx += 1, z_start = 0) {
210 page_off = (loff_t)idx << PAGE_SHIFT;
211 z_end = (page_off + PAGE_SIZE) > vbo_to ? (vbo_to - page_off)
212 : PAGE_SIZE;
213 iblock = page_off >> inode->i_blkbits;
214
215 page = find_or_create_page(mapping, idx,
216 mapping_gfp_constraint(mapping,
217 ~__GFP_FS));
218 if (!page)
219 return -ENOMEM;
220
221 if (!page_has_buffers(page))
222 create_empty_buffers(page, blocksize, 0);
223
224 bh = head = page_buffers(page);
225 bh_off = 0;
226 do {
227 bh_next = bh_off + blocksize;
228
229 if (bh_next <= z_start || bh_off >= z_end)
230 continue;
231
232 if (!buffer_mapped(bh)) {
233 ntfs_get_block(inode, iblock, bh, 0);
234 /* Unmapped? It's a hole - nothing to do. */
235 if (!buffer_mapped(bh))
236 continue;
237 }
238
239 /* Ok, it's mapped. Make sure it's up-to-date. */
240 if (PageUptodate(page))
241 set_buffer_uptodate(bh);
242
243 if (!buffer_uptodate(bh)) {
244 lock_buffer(bh);
245 bh->b_end_io = end_buffer_read_sync;
246 get_bh(bh);
247 submit_bh(REQ_OP_READ, 0, bh);
248
249 wait_on_buffer(bh);
250 if (!buffer_uptodate(bh)) {
251 unlock_page(page);
252 put_page(page);
253 err = -EIO;
254 goto out;
255 }
256 }
257
258 mark_buffer_dirty(bh);
259
260 } while (bh_off = bh_next, iblock += 1,
261 head != (bh = bh->b_this_page));
262
263 zero_user_segment(page, z_start, z_end);
264
265 unlock_page(page);
266 put_page(page);
267 cond_resched();
268 }
269 out:
270 mark_inode_dirty(inode);
271 return err;
272 }
273
274 /*
275 * ntfs_sparse_cluster - Helper function to zero a new allocated clusters.
276 *
277 * NOTE: 512 <= cluster size <= 2M
278 */
ntfs_sparse_cluster(struct inode * inode,struct page * page0,CLST vcn,CLST len)279 void ntfs_sparse_cluster(struct inode *inode, struct page *page0, CLST vcn,
280 CLST len)
281 {
282 struct address_space *mapping = inode->i_mapping;
283 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
284 u64 vbo = (u64)vcn << sbi->cluster_bits;
285 u64 bytes = (u64)len << sbi->cluster_bits;
286 u32 blocksize = 1 << inode->i_blkbits;
287 pgoff_t idx0 = page0 ? page0->index : -1;
288 loff_t vbo_clst = vbo & sbi->cluster_mask_inv;
289 loff_t end = ntfs_up_cluster(sbi, vbo + bytes);
290 pgoff_t idx = vbo_clst >> PAGE_SHIFT;
291 u32 from = vbo_clst & (PAGE_SIZE - 1);
292 pgoff_t idx_end = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
293 loff_t page_off;
294 u32 to;
295 bool partial;
296 struct page *page;
297
298 for (; idx < idx_end; idx += 1, from = 0) {
299 page = idx == idx0 ? page0 : grab_cache_page(mapping, idx);
300
301 if (!page)
302 continue;
303
304 page_off = (loff_t)idx << PAGE_SHIFT;
305 to = (page_off + PAGE_SIZE) > end ? (end - page_off)
306 : PAGE_SIZE;
307 partial = false;
308
309 if ((from || PAGE_SIZE != to) &&
310 likely(!page_has_buffers(page))) {
311 create_empty_buffers(page, blocksize, 0);
312 }
313
314 if (page_has_buffers(page)) {
315 struct buffer_head *head, *bh;
316 u32 bh_off = 0;
317
318 bh = head = page_buffers(page);
319 do {
320 u32 bh_next = bh_off + blocksize;
321
322 if (from <= bh_off && bh_next <= to) {
323 set_buffer_uptodate(bh);
324 mark_buffer_dirty(bh);
325 } else if (!buffer_uptodate(bh)) {
326 partial = true;
327 }
328 bh_off = bh_next;
329 } while (head != (bh = bh->b_this_page));
330 }
331
332 zero_user_segment(page, from, to);
333
334 if (!partial) {
335 if (!PageUptodate(page))
336 SetPageUptodate(page);
337 set_page_dirty(page);
338 }
339
340 if (idx != idx0) {
341 unlock_page(page);
342 put_page(page);
343 }
344 cond_resched();
345 }
346 mark_inode_dirty(inode);
347 }
348
349 /*
350 * ntfs_file_mmap - file_operations::mmap
351 */
ntfs_file_mmap(struct file * file,struct vm_area_struct * vma)352 static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma)
353 {
354 struct address_space *mapping = file->f_mapping;
355 struct inode *inode = mapping->host;
356 struct ntfs_inode *ni = ntfs_i(inode);
357 u64 from = ((u64)vma->vm_pgoff << PAGE_SHIFT);
358 bool rw = vma->vm_flags & VM_WRITE;
359 int err;
360
361 if (is_encrypted(ni)) {
362 ntfs_inode_warn(inode, "mmap encrypted not supported");
363 return -EOPNOTSUPP;
364 }
365
366 if (is_dedup(ni)) {
367 ntfs_inode_warn(inode, "mmap deduplicated not supported");
368 return -EOPNOTSUPP;
369 }
370
371 if (is_compressed(ni) && rw) {
372 ntfs_inode_warn(inode, "mmap(write) compressed not supported");
373 return -EOPNOTSUPP;
374 }
375
376 if (rw) {
377 u64 to = min_t(loff_t, i_size_read(inode),
378 from + vma->vm_end - vma->vm_start);
379
380 if (is_sparsed(ni)) {
381 /* Allocate clusters for rw map. */
382 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
383 CLST lcn, len;
384 CLST vcn = from >> sbi->cluster_bits;
385 CLST end = bytes_to_cluster(sbi, to);
386 bool new;
387
388 for (; vcn < end; vcn += len) {
389 err = attr_data_get_block(ni, vcn, 1, &lcn,
390 &len, &new);
391 if (err)
392 goto out;
393
394 if (!new)
395 continue;
396 ntfs_sparse_cluster(inode, NULL, vcn, 1);
397 }
398 }
399
400 if (ni->i_valid < to) {
401 if (!inode_trylock(inode)) {
402 err = -EAGAIN;
403 goto out;
404 }
405 err = ntfs_extend_initialized_size(file, ni,
406 ni->i_valid, to);
407 inode_unlock(inode);
408 if (err)
409 goto out;
410 }
411 }
412
413 err = generic_file_mmap(file, vma);
414 out:
415 return err;
416 }
417
ntfs_extend(struct inode * inode,loff_t pos,size_t count,struct file * file)418 static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
419 struct file *file)
420 {
421 struct ntfs_inode *ni = ntfs_i(inode);
422 struct address_space *mapping = inode->i_mapping;
423 loff_t end = pos + count;
424 bool extend_init = file && pos > ni->i_valid;
425 int err;
426
427 if (end <= inode->i_size && !extend_init)
428 return 0;
429
430 /* Mark rw ntfs as dirty. It will be cleared at umount. */
431 ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
432
433 if (end > inode->i_size) {
434 err = ntfs_set_size(inode, end);
435 if (err)
436 goto out;
437 inode->i_size = end;
438 }
439
440 if (extend_init && !is_compressed(ni)) {
441 err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
442 if (err)
443 goto out;
444 } else {
445 err = 0;
446 }
447
448 inode->i_ctime = inode->i_mtime = current_time(inode);
449 mark_inode_dirty(inode);
450
451 if (IS_SYNC(inode)) {
452 int err2;
453
454 err = filemap_fdatawrite_range(mapping, pos, end - 1);
455 err2 = sync_mapping_buffers(mapping);
456 if (!err)
457 err = err2;
458 err2 = write_inode_now(inode, 1);
459 if (!err)
460 err = err2;
461 if (!err)
462 err = filemap_fdatawait_range(mapping, pos, end - 1);
463 }
464
465 out:
466 return err;
467 }
468
ntfs_truncate(struct inode * inode,loff_t new_size)469 static int ntfs_truncate(struct inode *inode, loff_t new_size)
470 {
471 struct super_block *sb = inode->i_sb;
472 struct ntfs_inode *ni = ntfs_i(inode);
473 int err, dirty = 0;
474 u64 new_valid;
475
476 if (!S_ISREG(inode->i_mode))
477 return 0;
478
479 if (is_compressed(ni)) {
480 if (ni->i_valid > new_size)
481 ni->i_valid = new_size;
482 } else {
483 err = block_truncate_page(inode->i_mapping, new_size,
484 ntfs_get_block);
485 if (err)
486 return err;
487 }
488
489 new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size));
490
491 truncate_setsize(inode, new_size);
492
493 ni_lock(ni);
494
495 down_write(&ni->file.run_lock);
496 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
497 &new_valid, ni->mi.sbi->options->prealloc, NULL);
498 up_write(&ni->file.run_lock);
499
500 if (new_valid < ni->i_valid)
501 ni->i_valid = new_valid;
502
503 ni_unlock(ni);
504
505 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
506 inode->i_ctime = inode->i_mtime = current_time(inode);
507 if (!IS_DIRSYNC(inode)) {
508 dirty = 1;
509 } else {
510 err = ntfs_sync_inode(inode);
511 if (err)
512 return err;
513 }
514
515 if (dirty)
516 mark_inode_dirty(inode);
517
518 /*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/
519
520 return 0;
521 }
522
523 /*
524 * ntfs_fallocate
525 *
526 * Preallocate space for a file. This implements ntfs's fallocate file
527 * operation, which gets called from sys_fallocate system call. User
528 * space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set
529 * we just allocate clusters without zeroing them out. Otherwise we
530 * allocate and zero out clusters via an expanding truncate.
531 */
ntfs_fallocate(struct file * file,int mode,loff_t vbo,loff_t len)532 static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
533 {
534 struct inode *inode = file->f_mapping->host;
535 struct super_block *sb = inode->i_sb;
536 struct ntfs_sb_info *sbi = sb->s_fs_info;
537 struct ntfs_inode *ni = ntfs_i(inode);
538 loff_t end = vbo + len;
539 loff_t vbo_down = round_down(vbo, PAGE_SIZE);
540 loff_t i_size;
541 int err;
542
543 /* No support for dir. */
544 if (!S_ISREG(inode->i_mode))
545 return -EOPNOTSUPP;
546
547 /* Return error if mode is not supported. */
548 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
549 FALLOC_FL_COLLAPSE_RANGE)) {
550 ntfs_inode_warn(inode, "fallocate(0x%x) is not supported",
551 mode);
552 return -EOPNOTSUPP;
553 }
554
555 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
556
557 inode_lock(inode);
558 i_size = inode->i_size;
559
560 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
561 /* Should never be here, see ntfs_file_open. */
562 err = -EOPNOTSUPP;
563 goto out;
564 }
565
566 if (mode & FALLOC_FL_PUNCH_HOLE) {
567 u32 frame_size;
568 loff_t mask, vbo_a, end_a, tmp;
569
570 if (!(mode & FALLOC_FL_KEEP_SIZE)) {
571 err = -EINVAL;
572 goto out;
573 }
574
575 err = filemap_write_and_wait_range(inode->i_mapping, vbo,
576 end - 1);
577 if (err)
578 goto out;
579
580 err = filemap_write_and_wait_range(inode->i_mapping, end,
581 LLONG_MAX);
582 if (err)
583 goto out;
584
585 inode_dio_wait(inode);
586
587 truncate_pagecache(inode, vbo_down);
588
589 if (!is_sparsed(ni) && !is_compressed(ni)) {
590 /*
591 * Normal file, can't make hole.
592 * TODO: Try to find way to save info about hole.
593 */
594 err = -EOPNOTSUPP;
595 goto out;
596 }
597
598 ni_lock(ni);
599 err = attr_punch_hole(ni, vbo, len, &frame_size);
600 ni_unlock(ni);
601 if (err != E_NTFS_NOTALIGNED)
602 goto out;
603
604 /* Process not aligned punch. */
605 mask = frame_size - 1;
606 vbo_a = (vbo + mask) & ~mask;
607 end_a = end & ~mask;
608
609 tmp = min(vbo_a, end);
610 if (tmp > vbo) {
611 err = ntfs_zero_range(inode, vbo, tmp);
612 if (err)
613 goto out;
614 }
615
616 if (vbo < end_a && end_a < end) {
617 err = ntfs_zero_range(inode, end_a, end);
618 if (err)
619 goto out;
620 }
621
622 /* Aligned punch_hole */
623 if (end_a > vbo_a) {
624 ni_lock(ni);
625 err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL);
626 ni_unlock(ni);
627 }
628 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
629 if (mode & ~FALLOC_FL_COLLAPSE_RANGE) {
630 err = -EINVAL;
631 goto out;
632 }
633
634 /*
635 * Write tail of the last page before removed range since
636 * it will get removed from the page cache below.
637 */
638 err = filemap_write_and_wait_range(inode->i_mapping, vbo_down,
639 vbo);
640 if (err)
641 goto out;
642
643 /*
644 * Write data that will be shifted to preserve them
645 * when discarding page cache below.
646 */
647 err = filemap_write_and_wait_range(inode->i_mapping, end,
648 LLONG_MAX);
649 if (err)
650 goto out;
651
652 /* Wait for existing dio to complete. */
653 inode_dio_wait(inode);
654
655 truncate_pagecache(inode, vbo_down);
656
657 ni_lock(ni);
658 err = attr_collapse_range(ni, vbo, len);
659 ni_unlock(ni);
660 } else {
661 /*
662 * Normal file: Allocate clusters, do not change 'valid' size.
663 */
664 loff_t new_size = max(end, i_size);
665
666 err = inode_newsize_ok(inode, new_size);
667 if (err)
668 goto out;
669
670 err = ntfs_set_size(inode, new_size);
671 if (err)
672 goto out;
673
674 if (is_sparsed(ni) || is_compressed(ni)) {
675 CLST vcn_v = ni->i_valid >> sbi->cluster_bits;
676 CLST vcn = vbo >> sbi->cluster_bits;
677 CLST cend = bytes_to_cluster(sbi, end);
678 CLST lcn, clen;
679 bool new;
680
681 /*
682 * Allocate but do not zero new clusters. (see below comments)
683 * This breaks security: One can read unused on-disk areas.
684 * Zeroing these clusters may be too long.
685 * Maybe we should check here for root rights?
686 */
687 for (; vcn < cend; vcn += clen) {
688 err = attr_data_get_block(ni, vcn, cend - vcn,
689 &lcn, &clen, &new);
690 if (err)
691 goto out;
692 if (!new || vcn >= vcn_v)
693 continue;
694
695 /*
696 * Unwritten area.
697 * NTFS is not able to store several unwritten areas.
698 * Activate 'ntfs_sparse_cluster' to zero new allocated clusters.
699 *
700 * Dangerous in case:
701 * 1G of sparsed clusters + 1 cluster of data =>
702 * valid_size == 1G + 1 cluster
703 * fallocate(1G) will zero 1G and this can be very long
704 * xfstest 016/086 will fail without 'ntfs_sparse_cluster'.
705 */
706 ntfs_sparse_cluster(inode, NULL, vcn,
707 min(vcn_v - vcn, clen));
708 }
709 }
710
711 if (mode & FALLOC_FL_KEEP_SIZE) {
712 ni_lock(ni);
713 /* True - Keep preallocated. */
714 err = attr_set_size(ni, ATTR_DATA, NULL, 0,
715 &ni->file.run, i_size, &ni->i_valid,
716 true, NULL);
717 ni_unlock(ni);
718 }
719 }
720
721 out:
722 if (err == -EFBIG)
723 err = -ENOSPC;
724
725 if (!err) {
726 inode->i_ctime = inode->i_mtime = current_time(inode);
727 mark_inode_dirty(inode);
728 }
729
730 inode_unlock(inode);
731 return err;
732 }
733
734 /*
735 * ntfs3_setattr - inode_operations::setattr
736 */
ntfs3_setattr(struct user_namespace * mnt_userns,struct dentry * dentry,struct iattr * attr)737 int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
738 struct iattr *attr)
739 {
740 struct super_block *sb = dentry->d_sb;
741 struct ntfs_sb_info *sbi = sb->s_fs_info;
742 struct inode *inode = d_inode(dentry);
743 struct ntfs_inode *ni = ntfs_i(inode);
744 u32 ia_valid = attr->ia_valid;
745 umode_t mode = inode->i_mode;
746 int err;
747
748 if (sbi->options->noacsrules) {
749 /* "No access rules" - Force any changes of time etc. */
750 attr->ia_valid |= ATTR_FORCE;
751 /* and disable for editing some attributes. */
752 attr->ia_valid &= ~(ATTR_UID | ATTR_GID | ATTR_MODE);
753 ia_valid = attr->ia_valid;
754 }
755
756 err = setattr_prepare(mnt_userns, dentry, attr);
757 if (err)
758 goto out;
759
760 if (ia_valid & ATTR_SIZE) {
761 loff_t oldsize = inode->i_size;
762
763 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
764 /* Should never be here, see ntfs_file_open(). */
765 err = -EOPNOTSUPP;
766 goto out;
767 }
768 inode_dio_wait(inode);
769
770 if (attr->ia_size <= oldsize)
771 err = ntfs_truncate(inode, attr->ia_size);
772 else if (attr->ia_size > oldsize)
773 err = ntfs_extend(inode, attr->ia_size, 0, NULL);
774
775 if (err)
776 goto out;
777
778 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
779 }
780
781 setattr_copy(mnt_userns, inode, attr);
782
783 if (mode != inode->i_mode) {
784 err = ntfs_acl_chmod(mnt_userns, inode);
785 if (err)
786 goto out;
787
788 /* Linux 'w' -> Windows 'ro'. */
789 if (0222 & inode->i_mode)
790 ni->std_fa &= ~FILE_ATTRIBUTE_READONLY;
791 else
792 ni->std_fa |= FILE_ATTRIBUTE_READONLY;
793 }
794
795 if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE))
796 ntfs_save_wsl_perm(inode);
797 mark_inode_dirty(inode);
798 out:
799 return err;
800 }
801
ntfs_file_read_iter(struct kiocb * iocb,struct iov_iter * iter)802 static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
803 {
804 struct file *file = iocb->ki_filp;
805 struct inode *inode = file->f_mapping->host;
806 struct ntfs_inode *ni = ntfs_i(inode);
807
808 if (is_encrypted(ni)) {
809 ntfs_inode_warn(inode, "encrypted i/o not supported");
810 return -EOPNOTSUPP;
811 }
812
813 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
814 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
815 return -EOPNOTSUPP;
816 }
817
818 #ifndef CONFIG_NTFS3_LZX_XPRESS
819 if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) {
820 ntfs_inode_warn(
821 inode,
822 "activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files");
823 return -EOPNOTSUPP;
824 }
825 #endif
826
827 if (is_dedup(ni)) {
828 ntfs_inode_warn(inode, "read deduplicated not supported");
829 return -EOPNOTSUPP;
830 }
831
832 return generic_file_read_iter(iocb, iter);
833 }
834
835 /*
836 * ntfs_get_frame_pages
837 *
838 * Return: Array of locked pages.
839 */
ntfs_get_frame_pages(struct address_space * mapping,pgoff_t index,struct page ** pages,u32 pages_per_frame,bool * frame_uptodate)840 static int ntfs_get_frame_pages(struct address_space *mapping, pgoff_t index,
841 struct page **pages, u32 pages_per_frame,
842 bool *frame_uptodate)
843 {
844 gfp_t gfp_mask = mapping_gfp_mask(mapping);
845 u32 npages;
846
847 *frame_uptodate = true;
848
849 for (npages = 0; npages < pages_per_frame; npages++, index++) {
850 struct page *page;
851
852 page = find_or_create_page(mapping, index, gfp_mask);
853 if (!page) {
854 while (npages--) {
855 page = pages[npages];
856 unlock_page(page);
857 put_page(page);
858 }
859
860 return -ENOMEM;
861 }
862
863 if (!PageUptodate(page))
864 *frame_uptodate = false;
865
866 pages[npages] = page;
867 }
868
869 return 0;
870 }
871
872 /*
873 * ntfs_compress_write - Helper for ntfs_file_write_iter() (compressed files).
874 */
ntfs_compress_write(struct kiocb * iocb,struct iov_iter * from)875 static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
876 {
877 int err;
878 struct file *file = iocb->ki_filp;
879 size_t count = iov_iter_count(from);
880 loff_t pos = iocb->ki_pos;
881 struct inode *inode = file_inode(file);
882 loff_t i_size = inode->i_size;
883 struct address_space *mapping = inode->i_mapping;
884 struct ntfs_inode *ni = ntfs_i(inode);
885 u64 valid = ni->i_valid;
886 struct ntfs_sb_info *sbi = ni->mi.sbi;
887 struct page *page, **pages = NULL;
888 size_t written = 0;
889 u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits;
890 u32 frame_size = 1u << frame_bits;
891 u32 pages_per_frame = frame_size >> PAGE_SHIFT;
892 u32 ip, off;
893 CLST frame;
894 u64 frame_vbo;
895 pgoff_t index;
896 bool frame_uptodate;
897
898 if (frame_size < PAGE_SIZE) {
899 /*
900 * frame_size == 8K if cluster 512
901 * frame_size == 64K if cluster 4096
902 */
903 ntfs_inode_warn(inode, "page size is bigger than frame size");
904 return -EOPNOTSUPP;
905 }
906
907 pages = kmalloc_array(pages_per_frame, sizeof(struct page *), GFP_NOFS);
908 if (!pages)
909 return -ENOMEM;
910
911 current->backing_dev_info = inode_to_bdi(inode);
912 err = file_remove_privs(file);
913 if (err)
914 goto out;
915
916 err = file_update_time(file);
917 if (err)
918 goto out;
919
920 /* Zero range [valid : pos). */
921 while (valid < pos) {
922 CLST lcn, clen;
923
924 frame = valid >> frame_bits;
925 frame_vbo = valid & ~(frame_size - 1);
926 off = valid & (frame_size - 1);
927
928 err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 0, &lcn,
929 &clen, NULL);
930 if (err)
931 goto out;
932
933 if (lcn == SPARSE_LCN) {
934 ni->i_valid = valid =
935 frame_vbo + ((u64)clen << sbi->cluster_bits);
936 continue;
937 }
938
939 /* Load full frame. */
940 err = ntfs_get_frame_pages(mapping, frame_vbo >> PAGE_SHIFT,
941 pages, pages_per_frame,
942 &frame_uptodate);
943 if (err)
944 goto out;
945
946 if (!frame_uptodate && off) {
947 err = ni_read_frame(ni, frame_vbo, pages,
948 pages_per_frame);
949 if (err) {
950 for (ip = 0; ip < pages_per_frame; ip++) {
951 page = pages[ip];
952 unlock_page(page);
953 put_page(page);
954 }
955 goto out;
956 }
957 }
958
959 ip = off >> PAGE_SHIFT;
960 off = offset_in_page(valid);
961 for (; ip < pages_per_frame; ip++, off = 0) {
962 page = pages[ip];
963 zero_user_segment(page, off, PAGE_SIZE);
964 flush_dcache_page(page);
965 SetPageUptodate(page);
966 }
967
968 ni_lock(ni);
969 err = ni_write_frame(ni, pages, pages_per_frame);
970 ni_unlock(ni);
971
972 for (ip = 0; ip < pages_per_frame; ip++) {
973 page = pages[ip];
974 SetPageUptodate(page);
975 unlock_page(page);
976 put_page(page);
977 }
978
979 if (err)
980 goto out;
981
982 ni->i_valid = valid = frame_vbo + frame_size;
983 }
984
985 /* Copy user data [pos : pos + count). */
986 while (count) {
987 size_t copied, bytes;
988
989 off = pos & (frame_size - 1);
990 bytes = frame_size - off;
991 if (bytes > count)
992 bytes = count;
993
994 frame = pos >> frame_bits;
995 frame_vbo = pos & ~(frame_size - 1);
996 index = frame_vbo >> PAGE_SHIFT;
997
998 if (unlikely(fault_in_iov_iter_readable(from, bytes))) {
999 err = -EFAULT;
1000 goto out;
1001 }
1002
1003 /* Load full frame. */
1004 err = ntfs_get_frame_pages(mapping, index, pages,
1005 pages_per_frame, &frame_uptodate);
1006 if (err)
1007 goto out;
1008
1009 if (!frame_uptodate) {
1010 loff_t to = pos + bytes;
1011
1012 if (off || (to < i_size && (to & (frame_size - 1)))) {
1013 err = ni_read_frame(ni, frame_vbo, pages,
1014 pages_per_frame);
1015 if (err) {
1016 for (ip = 0; ip < pages_per_frame;
1017 ip++) {
1018 page = pages[ip];
1019 unlock_page(page);
1020 put_page(page);
1021 }
1022 goto out;
1023 }
1024 }
1025 }
1026
1027 WARN_ON(!bytes);
1028 copied = 0;
1029 ip = off >> PAGE_SHIFT;
1030 off = offset_in_page(pos);
1031
1032 /* Copy user data to pages. */
1033 for (;;) {
1034 size_t cp, tail = PAGE_SIZE - off;
1035
1036 page = pages[ip];
1037 cp = copy_page_from_iter_atomic(page, off,
1038 min(tail, bytes), from);
1039 flush_dcache_page(page);
1040
1041 copied += cp;
1042 bytes -= cp;
1043 if (!bytes || !cp)
1044 break;
1045
1046 if (cp < tail) {
1047 off += cp;
1048 } else {
1049 ip++;
1050 off = 0;
1051 }
1052 }
1053
1054 ni_lock(ni);
1055 err = ni_write_frame(ni, pages, pages_per_frame);
1056 ni_unlock(ni);
1057
1058 for (ip = 0; ip < pages_per_frame; ip++) {
1059 page = pages[ip];
1060 ClearPageDirty(page);
1061 SetPageUptodate(page);
1062 unlock_page(page);
1063 put_page(page);
1064 }
1065
1066 if (err)
1067 goto out;
1068
1069 /*
1070 * We can loop for a long time in here. Be nice and allow
1071 * us to schedule out to avoid softlocking if preempt
1072 * is disabled.
1073 */
1074 cond_resched();
1075
1076 pos += copied;
1077 written += copied;
1078
1079 count = iov_iter_count(from);
1080 }
1081
1082 out:
1083 kfree(pages);
1084
1085 current->backing_dev_info = NULL;
1086
1087 if (err < 0)
1088 return err;
1089
1090 iocb->ki_pos += written;
1091 if (iocb->ki_pos > ni->i_valid)
1092 ni->i_valid = iocb->ki_pos;
1093
1094 return written;
1095 }
1096
1097 /*
1098 * ntfs_file_write_iter - file_operations::write_iter
1099 */
ntfs_file_write_iter(struct kiocb * iocb,struct iov_iter * from)1100 static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1101 {
1102 struct file *file = iocb->ki_filp;
1103 struct address_space *mapping = file->f_mapping;
1104 struct inode *inode = mapping->host;
1105 ssize_t ret;
1106 struct ntfs_inode *ni = ntfs_i(inode);
1107
1108 if (is_encrypted(ni)) {
1109 ntfs_inode_warn(inode, "encrypted i/o not supported");
1110 return -EOPNOTSUPP;
1111 }
1112
1113 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
1114 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
1115 return -EOPNOTSUPP;
1116 }
1117
1118 if (is_dedup(ni)) {
1119 ntfs_inode_warn(inode, "write into deduplicated not supported");
1120 return -EOPNOTSUPP;
1121 }
1122
1123 if (!inode_trylock(inode)) {
1124 if (iocb->ki_flags & IOCB_NOWAIT)
1125 return -EAGAIN;
1126 inode_lock(inode);
1127 }
1128
1129 ret = generic_write_checks(iocb, from);
1130 if (ret <= 0)
1131 goto out;
1132
1133 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
1134 /* Should never be here, see ntfs_file_open(). */
1135 ret = -EOPNOTSUPP;
1136 goto out;
1137 }
1138
1139 ret = ntfs_extend(inode, iocb->ki_pos, ret, file);
1140 if (ret)
1141 goto out;
1142
1143 ret = is_compressed(ni) ? ntfs_compress_write(iocb, from)
1144 : __generic_file_write_iter(iocb, from);
1145
1146 out:
1147 inode_unlock(inode);
1148
1149 if (ret > 0)
1150 ret = generic_write_sync(iocb, ret);
1151
1152 return ret;
1153 }
1154
1155 /*
1156 * ntfs_file_open - file_operations::open
1157 */
ntfs_file_open(struct inode * inode,struct file * file)1158 int ntfs_file_open(struct inode *inode, struct file *file)
1159 {
1160 struct ntfs_inode *ni = ntfs_i(inode);
1161
1162 if (unlikely((is_compressed(ni) || is_encrypted(ni)) &&
1163 (file->f_flags & O_DIRECT))) {
1164 return -EOPNOTSUPP;
1165 }
1166
1167 /* Decompress "external compressed" file if opened for rw. */
1168 if ((ni->ni_flags & NI_FLAG_COMPRESSED_MASK) &&
1169 (file->f_flags & (O_WRONLY | O_RDWR | O_TRUNC))) {
1170 #ifdef CONFIG_NTFS3_LZX_XPRESS
1171 int err = ni_decompress_file(ni);
1172
1173 if (err)
1174 return err;
1175 #else
1176 ntfs_inode_warn(
1177 inode,
1178 "activate CONFIG_NTFS3_LZX_XPRESS to write external compressed files");
1179 return -EOPNOTSUPP;
1180 #endif
1181 }
1182
1183 return generic_file_open(inode, file);
1184 }
1185
1186 /*
1187 * ntfs_file_release - file_operations::release
1188 */
ntfs_file_release(struct inode * inode,struct file * file)1189 static int ntfs_file_release(struct inode *inode, struct file *file)
1190 {
1191 struct ntfs_inode *ni = ntfs_i(inode);
1192 struct ntfs_sb_info *sbi = ni->mi.sbi;
1193 int err = 0;
1194
1195 /* If we are last writer on the inode, drop the block reservation. */
1196 if (sbi->options->prealloc && ((file->f_mode & FMODE_WRITE) &&
1197 atomic_read(&inode->i_writecount) == 1)) {
1198 ni_lock(ni);
1199 down_write(&ni->file.run_lock);
1200
1201 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
1202 inode->i_size, &ni->i_valid, false, NULL);
1203
1204 up_write(&ni->file.run_lock);
1205 ni_unlock(ni);
1206 }
1207 return err;
1208 }
1209
1210 /*
1211 * ntfs_fiemap - file_operations::fiemap
1212 */
ntfs_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,__u64 start,__u64 len)1213 int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1214 __u64 start, __u64 len)
1215 {
1216 int err;
1217 struct ntfs_inode *ni = ntfs_i(inode);
1218
1219 err = fiemap_prep(inode, fieinfo, start, &len, ~FIEMAP_FLAG_XATTR);
1220 if (err)
1221 return err;
1222
1223 ni_lock(ni);
1224
1225 err = ni_fiemap(ni, fieinfo, start, len);
1226
1227 ni_unlock(ni);
1228
1229 return err;
1230 }
1231
1232 // clang-format off
1233 const struct inode_operations ntfs_file_inode_operations = {
1234 .getattr = ntfs_getattr,
1235 .setattr = ntfs3_setattr,
1236 .listxattr = ntfs_listxattr,
1237 .permission = ntfs_permission,
1238 .get_acl = ntfs_get_acl,
1239 .set_acl = ntfs_set_acl,
1240 .fiemap = ntfs_fiemap,
1241 };
1242
1243 const struct file_operations ntfs_file_operations = {
1244 .llseek = generic_file_llseek,
1245 .read_iter = ntfs_file_read_iter,
1246 .write_iter = ntfs_file_write_iter,
1247 .unlocked_ioctl = ntfs_ioctl,
1248 #ifdef CONFIG_COMPAT
1249 .compat_ioctl = ntfs_compat_ioctl,
1250 #endif
1251 .splice_read = generic_file_splice_read,
1252 .mmap = ntfs_file_mmap,
1253 .open = ntfs_file_open,
1254 .fsync = generic_file_fsync,
1255 .splice_write = iter_file_splice_write,
1256 .fallocate = ntfs_fallocate,
1257 .release = ntfs_file_release,
1258 };
1259 // clang-format on
1260