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 #include <linux/fileattr.h>
17
18 #include "debug.h"
19 #include "ntfs.h"
20 #include "ntfs_fs.h"
21
ntfs_ioctl_fitrim(struct ntfs_sb_info * sbi,unsigned long arg)22 static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
23 {
24 struct fstrim_range __user *user_range;
25 struct fstrim_range range;
26 struct block_device *dev;
27 int err;
28
29 if (!capable(CAP_SYS_ADMIN))
30 return -EPERM;
31
32 dev = sbi->sb->s_bdev;
33 if (!bdev_max_discard_sectors(dev))
34 return -EOPNOTSUPP;
35
36 user_range = (struct fstrim_range __user *)arg;
37 if (copy_from_user(&range, user_range, sizeof(range)))
38 return -EFAULT;
39
40 range.minlen = max_t(u32, range.minlen, bdev_discard_granularity(dev));
41
42 err = ntfs_trim_fs(sbi, &range);
43 if (err < 0)
44 return err;
45
46 if (copy_to_user(user_range, &range, sizeof(range)))
47 return -EFAULT;
48
49 return 0;
50 }
51
ntfs_ioctl_get_volume_label(struct ntfs_sb_info * sbi,u8 __user * buf)52 static int ntfs_ioctl_get_volume_label(struct ntfs_sb_info *sbi, u8 __user *buf)
53 {
54 if (copy_to_user(buf, sbi->volume.label, FSLABEL_MAX))
55 return -EFAULT;
56
57 return 0;
58 }
59
ntfs_ioctl_set_volume_label(struct ntfs_sb_info * sbi,u8 __user * buf)60 static int ntfs_ioctl_set_volume_label(struct ntfs_sb_info *sbi, u8 __user *buf)
61 {
62 u8 user[FSLABEL_MAX] = {0};
63 int len;
64
65 if (!capable(CAP_SYS_ADMIN))
66 return -EPERM;
67
68 if (copy_from_user(user, buf, FSLABEL_MAX))
69 return -EFAULT;
70
71 len = strnlen(user, FSLABEL_MAX);
72
73 return ntfs_set_label(sbi, user, len);
74 }
75
76 /*
77 * ntfs_ioctl - file_operations::unlocked_ioctl
78 */
ntfs_ioctl(struct file * filp,u32 cmd,unsigned long arg)79 long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg)
80 {
81 struct inode *inode = file_inode(filp);
82 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
83
84 /* Avoid any operation if inode is bad. */
85 if (unlikely(is_bad_ni(ntfs_i(inode))))
86 return -EINVAL;
87
88 switch (cmd) {
89 case FITRIM:
90 return ntfs_ioctl_fitrim(sbi, arg);
91 case FS_IOC_GETFSLABEL:
92 return ntfs_ioctl_get_volume_label(sbi, (u8 __user *)arg);
93 case FS_IOC_SETFSLABEL:
94 return ntfs_ioctl_set_volume_label(sbi, (u8 __user *)arg);
95 }
96 return -ENOTTY; /* Inappropriate ioctl for device. */
97 }
98
99 #ifdef CONFIG_COMPAT
ntfs_compat_ioctl(struct file * filp,u32 cmd,unsigned long arg)100 long ntfs_compat_ioctl(struct file *filp, u32 cmd, unsigned long arg)
101
102 {
103 return ntfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
104 }
105 #endif
106
107 /*
108 * ntfs_getattr - inode_operations::getattr
109 */
ntfs_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,u32 flags)110 int ntfs_getattr(struct mnt_idmap *idmap, const struct path *path,
111 struct kstat *stat, u32 request_mask, u32 flags)
112 {
113 struct inode *inode = d_inode(path->dentry);
114 struct ntfs_inode *ni = ntfs_i(inode);
115
116 /* Avoid any operation if inode is bad. */
117 if (unlikely(is_bad_ni(ni)))
118 return -EINVAL;
119
120 stat->result_mask |= STATX_BTIME;
121 stat->btime = ni->i_crtime;
122 stat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */
123
124 if (inode->i_flags & S_IMMUTABLE)
125 stat->attributes |= STATX_ATTR_IMMUTABLE;
126
127 if (inode->i_flags & S_APPEND)
128 stat->attributes |= STATX_ATTR_APPEND;
129
130 if (is_compressed(ni))
131 stat->attributes |= STATX_ATTR_COMPRESSED;
132
133 if (is_encrypted(ni))
134 stat->attributes |= STATX_ATTR_ENCRYPTED;
135
136 stat->attributes_mask |= STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED |
137 STATX_ATTR_IMMUTABLE | STATX_ATTR_APPEND;
138
139 generic_fillattr(idmap, request_mask, inode, stat);
140
141 return 0;
142 }
143
ntfs_extend_initialized_size(struct file * file,struct ntfs_inode * ni,const loff_t valid,const loff_t new_valid)144 static int ntfs_extend_initialized_size(struct file *file,
145 struct ntfs_inode *ni,
146 const loff_t valid,
147 const loff_t new_valid)
148 {
149 struct inode *inode = &ni->vfs_inode;
150 struct address_space *mapping = inode->i_mapping;
151 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
152 loff_t pos = valid;
153 int err;
154
155 if (valid >= new_valid)
156 return 0;
157
158 if (is_resident(ni)) {
159 ni->i_valid = new_valid;
160 return 0;
161 }
162
163 WARN_ON(is_compressed(ni));
164
165 for (;;) {
166 u32 zerofrom, len;
167 struct folio *folio;
168 u8 bits;
169 CLST vcn, lcn, clen;
170
171 if (is_sparsed(ni)) {
172 bits = sbi->cluster_bits;
173 vcn = pos >> bits;
174
175 err = attr_data_get_block(ni, vcn, 1, &lcn, &clen, NULL,
176 false);
177 if (err)
178 goto out;
179
180 if (lcn == SPARSE_LCN) {
181 pos = ((loff_t)clen + vcn) << bits;
182 ni->i_valid = pos;
183 goto next;
184 }
185 }
186
187 zerofrom = pos & (PAGE_SIZE - 1);
188 len = PAGE_SIZE - zerofrom;
189
190 if (pos + len > new_valid)
191 len = new_valid - pos;
192
193 err = ntfs_write_begin(NULL, mapping, pos, len, &folio, NULL);
194 if (err)
195 goto out;
196
197 folio_zero_range(folio, zerofrom, folio_size(folio) - zerofrom);
198
199 err = ntfs_write_end(NULL, mapping, pos, len, len, folio, NULL);
200 if (err < 0)
201 goto out;
202 pos += len;
203
204 next:
205 if (pos >= new_valid)
206 break;
207
208 balance_dirty_pages_ratelimited(mapping);
209 cond_resched();
210 }
211
212 return 0;
213
214 out:
215 ni->i_valid = valid;
216 ntfs_inode_warn(inode, "failed to extend initialized size to %llx.",
217 new_valid);
218 return err;
219 }
220
221 /*
222 * ntfs_zero_range - Helper function for punch_hole.
223 *
224 * It zeroes a range [vbo, vbo_to).
225 */
ntfs_zero_range(struct inode * inode,u64 vbo,u64 vbo_to)226 static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
227 {
228 int err = 0;
229 struct address_space *mapping = inode->i_mapping;
230 u32 blocksize = i_blocksize(inode);
231 pgoff_t idx = vbo >> PAGE_SHIFT;
232 u32 from = vbo & (PAGE_SIZE - 1);
233 pgoff_t idx_end = (vbo_to + PAGE_SIZE - 1) >> PAGE_SHIFT;
234 loff_t page_off;
235 struct buffer_head *head, *bh;
236 u32 bh_next, bh_off, to;
237 sector_t iblock;
238 struct folio *folio;
239 bool dirty = false;
240
241 for (; idx < idx_end; idx += 1, from = 0) {
242 page_off = (loff_t)idx << PAGE_SHIFT;
243 to = (page_off + PAGE_SIZE) > vbo_to ? (vbo_to - page_off) :
244 PAGE_SIZE;
245 iblock = page_off >> inode->i_blkbits;
246
247 folio = __filemap_get_folio(
248 mapping, idx, FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
249 mapping_gfp_constraint(mapping, ~__GFP_FS));
250 if (IS_ERR(folio))
251 return PTR_ERR(folio);
252
253 head = folio_buffers(folio);
254 if (!head)
255 head = create_empty_buffers(folio, blocksize, 0);
256
257 bh = head;
258 bh_off = 0;
259 do {
260 bh_next = bh_off + blocksize;
261
262 if (bh_next <= from || bh_off >= to)
263 continue;
264
265 if (!buffer_mapped(bh)) {
266 ntfs_get_block(inode, iblock, bh, 0);
267 /* Unmapped? It's a hole - nothing to do. */
268 if (!buffer_mapped(bh))
269 continue;
270 }
271
272 /* Ok, it's mapped. Make sure it's up-to-date. */
273 if (folio_test_uptodate(folio))
274 set_buffer_uptodate(bh);
275 else if (bh_read(bh, 0) < 0) {
276 err = -EIO;
277 folio_unlock(folio);
278 folio_put(folio);
279 goto out;
280 }
281
282 mark_buffer_dirty(bh);
283 } while (bh_off = bh_next, iblock += 1,
284 head != (bh = bh->b_this_page));
285
286 folio_zero_segment(folio, from, to);
287 dirty = true;
288
289 folio_unlock(folio);
290 folio_put(folio);
291 cond_resched();
292 }
293 out:
294 if (dirty)
295 mark_inode_dirty(inode);
296 return err;
297 }
298
299 /*
300 * ntfs_file_mmap_prepare - file_operations::mmap_prepare
301 */
ntfs_file_mmap_prepare(struct vm_area_desc * desc)302 static int ntfs_file_mmap_prepare(struct vm_area_desc *desc)
303 {
304 struct file *file = desc->file;
305 struct inode *inode = file_inode(file);
306 struct ntfs_inode *ni = ntfs_i(inode);
307 u64 from = ((u64)desc->pgoff << PAGE_SHIFT);
308 bool rw = desc->vm_flags & VM_WRITE;
309 int err;
310
311 /* Avoid any operation if inode is bad. */
312 if (unlikely(is_bad_ni(ni)))
313 return -EINVAL;
314
315 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
316 return -EIO;
317
318 if (is_encrypted(ni)) {
319 ntfs_inode_warn(inode, "mmap encrypted not supported");
320 return -EOPNOTSUPP;
321 }
322
323 if (is_dedup(ni)) {
324 ntfs_inode_warn(inode, "mmap deduplicated not supported");
325 return -EOPNOTSUPP;
326 }
327
328 if (is_compressed(ni) && rw) {
329 ntfs_inode_warn(inode, "mmap(write) compressed not supported");
330 return -EOPNOTSUPP;
331 }
332
333 if (rw) {
334 u64 to = min_t(loff_t, i_size_read(inode),
335 from + desc->end - desc->start);
336
337 if (is_sparsed(ni)) {
338 /* Allocate clusters for rw map. */
339 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
340 CLST lcn, len;
341 CLST vcn = from >> sbi->cluster_bits;
342 CLST end = bytes_to_cluster(sbi, to);
343 bool new;
344
345 for (; vcn < end; vcn += len) {
346 err = attr_data_get_block(ni, vcn, 1, &lcn,
347 &len, &new, true);
348 if (err)
349 goto out;
350 }
351 }
352
353 if (ni->i_valid < to) {
354 if (!inode_trylock(inode)) {
355 err = -EAGAIN;
356 goto out;
357 }
358 err = ntfs_extend_initialized_size(file, ni,
359 ni->i_valid, to);
360 inode_unlock(inode);
361 if (err)
362 goto out;
363 }
364 }
365
366 err = generic_file_mmap_prepare(desc);
367 out:
368 return err;
369 }
370
ntfs_extend(struct inode * inode,loff_t pos,size_t count,struct file * file)371 static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
372 struct file *file)
373 {
374 struct ntfs_inode *ni = ntfs_i(inode);
375 struct address_space *mapping = inode->i_mapping;
376 loff_t end = pos + count;
377 bool extend_init = file && pos > ni->i_valid;
378 int err;
379
380 if (end <= inode->i_size && !extend_init)
381 return 0;
382
383 /* Mark rw ntfs as dirty. It will be cleared at umount. */
384 ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
385
386 if (end > inode->i_size) {
387 err = ntfs_set_size(inode, end);
388 if (err)
389 goto out;
390 }
391
392 if (extend_init && !is_compressed(ni)) {
393 err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
394 if (err)
395 goto out;
396 } else {
397 err = 0;
398 }
399
400 if (file && is_sparsed(ni)) {
401 /*
402 * This code optimizes large writes to sparse file.
403 * TODO: merge this fragment with fallocate fragment.
404 */
405 struct ntfs_sb_info *sbi = ni->mi.sbi;
406 CLST vcn = pos >> sbi->cluster_bits;
407 CLST cend = bytes_to_cluster(sbi, end);
408 CLST cend_v = bytes_to_cluster(sbi, ni->i_valid);
409 CLST lcn, clen;
410 bool new;
411
412 if (cend_v > cend)
413 cend_v = cend;
414
415 /*
416 * Allocate and zero new clusters.
417 * Zeroing these clusters may be too long.
418 */
419 for (; vcn < cend_v; vcn += clen) {
420 err = attr_data_get_block(ni, vcn, cend_v - vcn, &lcn,
421 &clen, &new, true);
422 if (err)
423 goto out;
424 }
425 /*
426 * Allocate but not zero new clusters.
427 */
428 for (; vcn < cend; vcn += clen) {
429 err = attr_data_get_block(ni, vcn, cend - vcn, &lcn,
430 &clen, &new, false);
431 if (err)
432 goto out;
433 }
434 }
435
436 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
437 mark_inode_dirty(inode);
438
439 if (IS_SYNC(inode)) {
440 int err2;
441
442 err = filemap_fdatawrite_range(mapping, pos, end - 1);
443 err2 = sync_mapping_buffers(mapping);
444 if (!err)
445 err = err2;
446 err2 = write_inode_now(inode, 1);
447 if (!err)
448 err = err2;
449 if (!err)
450 err = filemap_fdatawait_range(mapping, pos, end - 1);
451 }
452
453 out:
454 return err;
455 }
456
ntfs_truncate(struct inode * inode,loff_t new_size)457 static int ntfs_truncate(struct inode *inode, loff_t new_size)
458 {
459 struct super_block *sb = inode->i_sb;
460 struct ntfs_inode *ni = ntfs_i(inode);
461 int err, dirty = 0;
462 u64 new_valid;
463
464 if (!S_ISREG(inode->i_mode))
465 return 0;
466
467 if (is_compressed(ni)) {
468 if (ni->i_valid > new_size)
469 ni->i_valid = new_size;
470 } else {
471 err = block_truncate_page(inode->i_mapping, new_size,
472 ntfs_get_block);
473 if (err)
474 return err;
475 }
476
477 new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size));
478
479 truncate_setsize(inode, new_size);
480
481 ni_lock(ni);
482
483 down_write(&ni->file.run_lock);
484 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
485 &new_valid, ni->mi.sbi->options->prealloc, NULL);
486 up_write(&ni->file.run_lock);
487
488 if (new_valid < ni->i_valid)
489 ni->i_valid = new_valid;
490
491 ni_unlock(ni);
492
493 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
494 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
495 if (!IS_DIRSYNC(inode)) {
496 dirty = 1;
497 } else {
498 err = ntfs_sync_inode(inode);
499 if (err)
500 return err;
501 }
502
503 if (dirty)
504 mark_inode_dirty(inode);
505
506 /*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/
507
508 return 0;
509 }
510
511 /*
512 * ntfs_fallocate - file_operations::ntfs_fallocate
513 *
514 * Preallocate space for a file. This implements ntfs's fallocate file
515 * operation, which gets called from sys_fallocate system call. User
516 * space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set
517 * we just allocate clusters without zeroing them out. Otherwise we
518 * allocate and zero out clusters via an expanding truncate.
519 */
ntfs_fallocate(struct file * file,int mode,loff_t vbo,loff_t len)520 static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
521 {
522 struct inode *inode = file_inode(file);
523 struct address_space *mapping = inode->i_mapping;
524 struct super_block *sb = inode->i_sb;
525 struct ntfs_sb_info *sbi = sb->s_fs_info;
526 struct ntfs_inode *ni = ntfs_i(inode);
527 loff_t end = vbo + len;
528 loff_t vbo_down = round_down(vbo, max_t(unsigned long,
529 sbi->cluster_size, PAGE_SIZE));
530 bool is_supported_holes = is_sparsed(ni) || is_compressed(ni);
531 loff_t i_size, new_size;
532 bool map_locked;
533 int err;
534
535 /* No support for dir. */
536 if (!S_ISREG(inode->i_mode))
537 return -EOPNOTSUPP;
538
539 /*
540 * vfs_fallocate checks all possible combinations of mode.
541 * Do additional checks here before ntfs_set_state(dirty).
542 */
543 if (mode & FALLOC_FL_PUNCH_HOLE) {
544 if (!is_supported_holes)
545 return -EOPNOTSUPP;
546 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
547 } else if (mode & FALLOC_FL_INSERT_RANGE) {
548 if (!is_supported_holes)
549 return -EOPNOTSUPP;
550 } else if (mode &
551 ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
552 FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)) {
553 ntfs_inode_warn(inode, "fallocate(0x%x) is not supported",
554 mode);
555 return -EOPNOTSUPP;
556 }
557
558 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
559
560 inode_lock(inode);
561 i_size = inode->i_size;
562 new_size = max(end, i_size);
563 map_locked = false;
564
565 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
566 /* Should never be here, see ntfs_file_open. */
567 err = -EOPNOTSUPP;
568 goto out;
569 }
570
571 if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE |
572 FALLOC_FL_INSERT_RANGE)) {
573 inode_dio_wait(inode);
574 filemap_invalidate_lock(mapping);
575 map_locked = true;
576 }
577
578 if (mode & FALLOC_FL_PUNCH_HOLE) {
579 u32 frame_size;
580 loff_t mask, vbo_a, end_a, tmp;
581
582 err = filemap_write_and_wait_range(mapping, vbo_down,
583 LLONG_MAX);
584 if (err)
585 goto out;
586
587 truncate_pagecache(inode, vbo_down);
588
589 ni_lock(ni);
590 err = attr_punch_hole(ni, vbo, len, &frame_size);
591 ni_unlock(ni);
592 if (!err)
593 goto ok;
594
595 if (err != E_NTFS_NOTALIGNED)
596 goto out;
597
598 /* Process not aligned punch. */
599 err = 0;
600 mask = frame_size - 1;
601 vbo_a = (vbo + mask) & ~mask;
602 end_a = end & ~mask;
603
604 tmp = min(vbo_a, end);
605 if (tmp > vbo) {
606 err = ntfs_zero_range(inode, vbo, tmp);
607 if (err)
608 goto out;
609 }
610
611 if (vbo < end_a && end_a < end) {
612 err = ntfs_zero_range(inode, end_a, end);
613 if (err)
614 goto out;
615 }
616
617 /* Aligned punch_hole */
618 if (end_a > vbo_a) {
619 ni_lock(ni);
620 err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL);
621 ni_unlock(ni);
622 if (err)
623 goto out;
624 }
625 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
626 /*
627 * Write tail of the last page before removed range since
628 * it will get removed from the page cache below.
629 */
630 err = filemap_write_and_wait_range(mapping, vbo_down, vbo);
631 if (err)
632 goto out;
633
634 /*
635 * Write data that will be shifted to preserve them
636 * when discarding page cache below.
637 */
638 err = filemap_write_and_wait_range(mapping, end, LLONG_MAX);
639 if (err)
640 goto out;
641
642 truncate_pagecache(inode, vbo_down);
643
644 ni_lock(ni);
645 err = attr_collapse_range(ni, vbo, len);
646 ni_unlock(ni);
647 if (err)
648 goto out;
649 } else if (mode & FALLOC_FL_INSERT_RANGE) {
650 /* Check new size. */
651 err = inode_newsize_ok(inode, new_size);
652 if (err)
653 goto out;
654
655 /* Write out all dirty pages. */
656 err = filemap_write_and_wait_range(mapping, vbo_down,
657 LLONG_MAX);
658 if (err)
659 goto out;
660 truncate_pagecache(inode, vbo_down);
661
662 ni_lock(ni);
663 err = attr_insert_range(ni, vbo, len);
664 ni_unlock(ni);
665 if (err)
666 goto out;
667 } else {
668 /* Check new size. */
669 u8 cluster_bits = sbi->cluster_bits;
670
671 /* Be sure file is non resident. */
672 if (is_resident(ni)) {
673 ni_lock(ni);
674 err = attr_force_nonresident(ni);
675 ni_unlock(ni);
676 if (err)
677 goto out;
678 }
679
680 /* generic/213: expected -ENOSPC instead of -EFBIG. */
681 if (!is_supported_holes) {
682 loff_t to_alloc = new_size - inode_get_bytes(inode);
683
684 if (to_alloc > 0 &&
685 (to_alloc >> cluster_bits) >
686 wnd_zeroes(&sbi->used.bitmap)) {
687 err = -ENOSPC;
688 goto out;
689 }
690 }
691
692 err = inode_newsize_ok(inode, new_size);
693 if (err)
694 goto out;
695
696 if (new_size > i_size) {
697 /*
698 * Allocate clusters, do not change 'valid' size.
699 */
700 err = ntfs_set_size(inode, new_size);
701 if (err)
702 goto out;
703 }
704
705 if (is_supported_holes) {
706 CLST vcn = vbo >> cluster_bits;
707 CLST cend = bytes_to_cluster(sbi, end);
708 CLST cend_v = bytes_to_cluster(sbi, ni->i_valid);
709 CLST lcn, clen;
710 bool new;
711
712 if (cend_v > cend)
713 cend_v = cend;
714
715 /*
716 * Allocate and zero new clusters.
717 * Zeroing these clusters may be too long.
718 */
719 for (; vcn < cend_v; vcn += clen) {
720 err = attr_data_get_block(ni, vcn, cend_v - vcn,
721 &lcn, &clen, &new,
722 true);
723 if (err)
724 goto out;
725 }
726 /*
727 * Allocate but not zero new clusters.
728 */
729 for (; vcn < cend; vcn += clen) {
730 err = attr_data_get_block(ni, vcn, cend - vcn,
731 &lcn, &clen, &new,
732 false);
733 if (err)
734 goto out;
735 }
736 }
737
738 if (mode & FALLOC_FL_KEEP_SIZE) {
739 ni_lock(ni);
740 /* True - Keep preallocated. */
741 err = attr_set_size(ni, ATTR_DATA, NULL, 0,
742 &ni->file.run, i_size, &ni->i_valid,
743 true, NULL);
744 ni_unlock(ni);
745 if (err)
746 goto out;
747 } else if (new_size > i_size) {
748 i_size_write(inode, new_size);
749 }
750 }
751
752 ok:
753 err = file_modified(file);
754 if (err)
755 goto out;
756
757 out:
758 if (map_locked)
759 filemap_invalidate_unlock(mapping);
760
761 if (!err) {
762 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
763 mark_inode_dirty(inode);
764 }
765
766 inode_unlock(inode);
767 return err;
768 }
769
770 /*
771 * ntfs_setattr - inode_operations::setattr
772 */
ntfs_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * attr)773 int ntfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
774 struct iattr *attr)
775 {
776 struct inode *inode = d_inode(dentry);
777 struct ntfs_inode *ni = ntfs_i(inode);
778 u32 ia_valid = attr->ia_valid;
779 umode_t mode = inode->i_mode;
780 int err;
781
782 /* Avoid any operation if inode is bad. */
783 if (unlikely(is_bad_ni(ni)))
784 return -EINVAL;
785
786 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
787 return -EIO;
788
789 err = setattr_prepare(idmap, dentry, attr);
790 if (err)
791 goto out;
792
793 if (ia_valid & ATTR_SIZE) {
794 loff_t newsize, oldsize;
795
796 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
797 /* Should never be here, see ntfs_file_open(). */
798 err = -EOPNOTSUPP;
799 goto out;
800 }
801 inode_dio_wait(inode);
802 oldsize = i_size_read(inode);
803 newsize = attr->ia_size;
804
805 if (newsize <= oldsize)
806 err = ntfs_truncate(inode, newsize);
807 else
808 err = ntfs_extend(inode, newsize, 0, NULL);
809
810 if (err)
811 goto out;
812
813 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
814 i_size_write(inode, newsize);
815 }
816
817 setattr_copy(idmap, inode, attr);
818
819 if (mode != inode->i_mode) {
820 err = ntfs_acl_chmod(idmap, dentry);
821 if (err)
822 goto out;
823
824 /* Linux 'w' -> Windows 'ro'. */
825 if (0222 & inode->i_mode)
826 ni->std_fa &= ~FILE_ATTRIBUTE_READONLY;
827 else
828 ni->std_fa |= FILE_ATTRIBUTE_READONLY;
829 }
830
831 if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE))
832 ntfs_save_wsl_perm(inode, NULL);
833 mark_inode_dirty(inode);
834 out:
835 return err;
836 }
837
838 /*
839 * check_read_restriction:
840 * common code for ntfs_file_read_iter and ntfs_file_splice_read
841 */
check_read_restriction(struct inode * inode)842 static int check_read_restriction(struct inode *inode)
843 {
844 struct ntfs_inode *ni = ntfs_i(inode);
845
846 /* Avoid any operation if inode is bad. */
847 if (unlikely(is_bad_ni(ni)))
848 return -EINVAL;
849
850 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
851 return -EIO;
852
853 if (is_encrypted(ni)) {
854 ntfs_inode_warn(inode, "encrypted i/o not supported");
855 return -EOPNOTSUPP;
856 }
857
858 #ifndef CONFIG_NTFS3_LZX_XPRESS
859 if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) {
860 ntfs_inode_warn(
861 inode,
862 "activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files");
863 return -EOPNOTSUPP;
864 }
865 #endif
866
867 if (is_dedup(ni)) {
868 ntfs_inode_warn(inode, "read deduplicated not supported");
869 return -EOPNOTSUPP;
870 }
871
872 return 0;
873 }
874
875 /*
876 * ntfs_file_read_iter - file_operations::read_iter
877 */
ntfs_file_read_iter(struct kiocb * iocb,struct iov_iter * iter)878 static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
879 {
880 struct file *file = iocb->ki_filp;
881 struct inode *inode = file_inode(file);
882 struct ntfs_inode *ni = ntfs_i(inode);
883 ssize_t err;
884
885 err = check_read_restriction(inode);
886 if (err)
887 return err;
888
889 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
890 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
891 return -EOPNOTSUPP;
892 }
893
894 return generic_file_read_iter(iocb, iter);
895 }
896
897 /*
898 * ntfs_file_splice_read - file_operations::splice_read
899 */
ntfs_file_splice_read(struct file * in,loff_t * ppos,struct pipe_inode_info * pipe,size_t len,unsigned int flags)900 static ssize_t ntfs_file_splice_read(struct file *in, loff_t *ppos,
901 struct pipe_inode_info *pipe, size_t len,
902 unsigned int flags)
903 {
904 struct inode *inode = file_inode(in);
905 ssize_t err;
906
907 err = check_read_restriction(inode);
908 if (err)
909 return err;
910
911 return filemap_splice_read(in, ppos, pipe, len, flags);
912 }
913
914 /*
915 * ntfs_get_frame_pages
916 *
917 * Return: Array of locked pages.
918 */
ntfs_get_frame_pages(struct address_space * mapping,pgoff_t index,struct page ** pages,u32 pages_per_frame,bool * frame_uptodate)919 static int ntfs_get_frame_pages(struct address_space *mapping, pgoff_t index,
920 struct page **pages, u32 pages_per_frame,
921 bool *frame_uptodate)
922 {
923 gfp_t gfp_mask = mapping_gfp_mask(mapping);
924 u32 npages;
925
926 *frame_uptodate = true;
927
928 for (npages = 0; npages < pages_per_frame; npages++, index++) {
929 struct folio *folio;
930
931 folio = __filemap_get_folio(mapping, index,
932 FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
933 gfp_mask);
934 if (IS_ERR(folio)) {
935 while (npages--) {
936 folio = page_folio(pages[npages]);
937 folio_unlock(folio);
938 folio_put(folio);
939 }
940
941 return -ENOMEM;
942 }
943
944 if (!folio_test_uptodate(folio))
945 *frame_uptodate = false;
946
947 pages[npages] = &folio->page;
948 }
949
950 return 0;
951 }
952
953 /*
954 * ntfs_compress_write - Helper for ntfs_file_write_iter() (compressed files).
955 */
ntfs_compress_write(struct kiocb * iocb,struct iov_iter * from)956 static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
957 {
958 int err;
959 struct file *file = iocb->ki_filp;
960 size_t count = iov_iter_count(from);
961 loff_t pos = iocb->ki_pos;
962 struct inode *inode = file_inode(file);
963 loff_t i_size = i_size_read(inode);
964 struct address_space *mapping = inode->i_mapping;
965 struct ntfs_inode *ni = ntfs_i(inode);
966 u64 valid = ni->i_valid;
967 struct ntfs_sb_info *sbi = ni->mi.sbi;
968 struct page **pages = NULL;
969 struct folio *folio;
970 size_t written = 0;
971 u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits;
972 u32 frame_size = 1u << frame_bits;
973 u32 pages_per_frame = frame_size >> PAGE_SHIFT;
974 u32 ip, off;
975 CLST frame;
976 u64 frame_vbo;
977 pgoff_t index;
978 bool frame_uptodate;
979
980 if (frame_size < PAGE_SIZE) {
981 /*
982 * frame_size == 8K if cluster 512
983 * frame_size == 64K if cluster 4096
984 */
985 ntfs_inode_warn(inode, "page size is bigger than frame size");
986 return -EOPNOTSUPP;
987 }
988
989 pages = kmalloc_array(pages_per_frame, sizeof(struct page *), GFP_NOFS);
990 if (!pages)
991 return -ENOMEM;
992
993 err = file_remove_privs(file);
994 if (err)
995 goto out;
996
997 err = file_update_time(file);
998 if (err)
999 goto out;
1000
1001 /* Zero range [valid : pos). */
1002 while (valid < pos) {
1003 CLST lcn, clen;
1004
1005 frame = valid >> frame_bits;
1006 frame_vbo = valid & ~(frame_size - 1);
1007 off = valid & (frame_size - 1);
1008
1009 err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 1, &lcn,
1010 &clen, NULL, false);
1011 if (err)
1012 goto out;
1013
1014 if (lcn == SPARSE_LCN) {
1015 ni->i_valid = valid =
1016 frame_vbo + ((u64)clen << sbi->cluster_bits);
1017 continue;
1018 }
1019
1020 /* Load full frame. */
1021 err = ntfs_get_frame_pages(mapping, frame_vbo >> PAGE_SHIFT,
1022 pages, pages_per_frame,
1023 &frame_uptodate);
1024 if (err)
1025 goto out;
1026
1027 if (!frame_uptodate && off) {
1028 err = ni_read_frame(ni, frame_vbo, pages,
1029 pages_per_frame);
1030 if (err) {
1031 for (ip = 0; ip < pages_per_frame; ip++) {
1032 folio = page_folio(pages[ip]);
1033 folio_unlock(folio);
1034 folio_put(folio);
1035 }
1036 goto out;
1037 }
1038 }
1039
1040 ip = off >> PAGE_SHIFT;
1041 off = offset_in_page(valid);
1042 for (; ip < pages_per_frame; ip++, off = 0) {
1043 folio = page_folio(pages[ip]);
1044 folio_zero_segment(folio, off, PAGE_SIZE);
1045 flush_dcache_folio(folio);
1046 folio_mark_uptodate(folio);
1047 }
1048
1049 ni_lock(ni);
1050 err = ni_write_frame(ni, pages, pages_per_frame);
1051 ni_unlock(ni);
1052
1053 for (ip = 0; ip < pages_per_frame; ip++) {
1054 folio = page_folio(pages[ip]);
1055 folio_mark_uptodate(folio);
1056 folio_unlock(folio);
1057 folio_put(folio);
1058 }
1059
1060 if (err)
1061 goto out;
1062
1063 ni->i_valid = valid = frame_vbo + frame_size;
1064 }
1065
1066 /* Copy user data [pos : pos + count). */
1067 while (count) {
1068 size_t copied, bytes;
1069
1070 off = pos & (frame_size - 1);
1071 bytes = frame_size - off;
1072 if (bytes > count)
1073 bytes = count;
1074
1075 frame_vbo = pos & ~(frame_size - 1);
1076 index = frame_vbo >> PAGE_SHIFT;
1077
1078 if (unlikely(fault_in_iov_iter_readable(from, bytes))) {
1079 err = -EFAULT;
1080 goto out;
1081 }
1082
1083 /* Load full frame. */
1084 err = ntfs_get_frame_pages(mapping, index, pages,
1085 pages_per_frame, &frame_uptodate);
1086 if (err)
1087 goto out;
1088
1089 if (!frame_uptodate) {
1090 loff_t to = pos + bytes;
1091
1092 if (off || (to < i_size && (to & (frame_size - 1)))) {
1093 err = ni_read_frame(ni, frame_vbo, pages,
1094 pages_per_frame);
1095 if (err) {
1096 for (ip = 0; ip < pages_per_frame;
1097 ip++) {
1098 folio = page_folio(pages[ip]);
1099 folio_unlock(folio);
1100 folio_put(folio);
1101 }
1102 goto out;
1103 }
1104 }
1105 }
1106
1107 WARN_ON(!bytes);
1108 copied = 0;
1109 ip = off >> PAGE_SHIFT;
1110 off = offset_in_page(pos);
1111
1112 /* Copy user data to pages. */
1113 for (;;) {
1114 size_t cp, tail = PAGE_SIZE - off;
1115
1116 folio = page_folio(pages[ip]);
1117 cp = copy_folio_from_iter_atomic(folio, off,
1118 min(tail, bytes), from);
1119 flush_dcache_folio(folio);
1120
1121 copied += cp;
1122 bytes -= cp;
1123 if (!bytes || !cp)
1124 break;
1125
1126 if (cp < tail) {
1127 off += cp;
1128 } else {
1129 ip++;
1130 off = 0;
1131 }
1132 }
1133
1134 ni_lock(ni);
1135 err = ni_write_frame(ni, pages, pages_per_frame);
1136 ni_unlock(ni);
1137
1138 for (ip = 0; ip < pages_per_frame; ip++) {
1139 folio = page_folio(pages[ip]);
1140 folio_clear_dirty(folio);
1141 folio_mark_uptodate(folio);
1142 folio_unlock(folio);
1143 folio_put(folio);
1144 }
1145
1146 if (err)
1147 goto out;
1148
1149 /*
1150 * We can loop for a long time in here. Be nice and allow
1151 * us to schedule out to avoid softlocking if preempt
1152 * is disabled.
1153 */
1154 cond_resched();
1155
1156 pos += copied;
1157 written += copied;
1158
1159 count = iov_iter_count(from);
1160 }
1161
1162 out:
1163 kfree(pages);
1164
1165 if (err < 0)
1166 return err;
1167
1168 iocb->ki_pos += written;
1169 if (iocb->ki_pos > ni->i_valid)
1170 ni->i_valid = iocb->ki_pos;
1171 if (iocb->ki_pos > i_size)
1172 i_size_write(inode, iocb->ki_pos);
1173
1174 return written;
1175 }
1176
1177 /*
1178 * check_write_restriction:
1179 * common code for ntfs_file_write_iter and ntfs_file_splice_write
1180 */
check_write_restriction(struct inode * inode)1181 static int check_write_restriction(struct inode *inode)
1182 {
1183 struct ntfs_inode *ni = ntfs_i(inode);
1184
1185 /* Avoid any operation if inode is bad. */
1186 if (unlikely(is_bad_ni(ni)))
1187 return -EINVAL;
1188
1189 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
1190 return -EIO;
1191
1192 if (is_encrypted(ni)) {
1193 ntfs_inode_warn(inode, "encrypted i/o not supported");
1194 return -EOPNOTSUPP;
1195 }
1196
1197 if (is_dedup(ni)) {
1198 ntfs_inode_warn(inode, "write into deduplicated not supported");
1199 return -EOPNOTSUPP;
1200 }
1201
1202 return 0;
1203 }
1204
1205 /*
1206 * ntfs_file_write_iter - file_operations::write_iter
1207 */
ntfs_file_write_iter(struct kiocb * iocb,struct iov_iter * from)1208 static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1209 {
1210 struct file *file = iocb->ki_filp;
1211 struct inode *inode = file_inode(file);
1212 struct ntfs_inode *ni = ntfs_i(inode);
1213 ssize_t ret;
1214 int err;
1215
1216 if (!inode_trylock(inode)) {
1217 if (iocb->ki_flags & IOCB_NOWAIT)
1218 return -EAGAIN;
1219 inode_lock(inode);
1220 }
1221
1222 ret = check_write_restriction(inode);
1223 if (ret)
1224 goto out;
1225
1226 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
1227 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
1228 ret = -EOPNOTSUPP;
1229 goto out;
1230 }
1231
1232 ret = generic_write_checks(iocb, from);
1233 if (ret <= 0)
1234 goto out;
1235
1236 err = file_modified(iocb->ki_filp);
1237 if (err) {
1238 ret = err;
1239 goto out;
1240 }
1241
1242 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
1243 /* Should never be here, see ntfs_file_open(). */
1244 ret = -EOPNOTSUPP;
1245 goto out;
1246 }
1247
1248 ret = ntfs_extend(inode, iocb->ki_pos, ret, file);
1249 if (ret)
1250 goto out;
1251
1252 ret = is_compressed(ni) ? ntfs_compress_write(iocb, from) :
1253 __generic_file_write_iter(iocb, from);
1254
1255 out:
1256 inode_unlock(inode);
1257
1258 if (ret > 0)
1259 ret = generic_write_sync(iocb, ret);
1260
1261 return ret;
1262 }
1263
1264 /*
1265 * ntfs_file_open - file_operations::open
1266 */
ntfs_file_open(struct inode * inode,struct file * file)1267 int ntfs_file_open(struct inode *inode, struct file *file)
1268 {
1269 struct ntfs_inode *ni = ntfs_i(inode);
1270
1271 /* Avoid any operation if inode is bad. */
1272 if (unlikely(is_bad_ni(ni)))
1273 return -EINVAL;
1274
1275 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
1276 return -EIO;
1277
1278 if (unlikely((is_compressed(ni) || is_encrypted(ni)) &&
1279 (file->f_flags & O_DIRECT))) {
1280 return -EOPNOTSUPP;
1281 }
1282
1283 /* Decompress "external compressed" file if opened for rw. */
1284 if ((ni->ni_flags & NI_FLAG_COMPRESSED_MASK) &&
1285 (file->f_flags & (O_WRONLY | O_RDWR | O_TRUNC))) {
1286 #ifdef CONFIG_NTFS3_LZX_XPRESS
1287 int err = ni_decompress_file(ni);
1288
1289 if (err)
1290 return err;
1291 #else
1292 ntfs_inode_warn(
1293 inode,
1294 "activate CONFIG_NTFS3_LZX_XPRESS to write external compressed files");
1295 return -EOPNOTSUPP;
1296 #endif
1297 }
1298
1299 return generic_file_open(inode, file);
1300 }
1301
1302 /*
1303 * ntfs_file_release - file_operations::release
1304 */
ntfs_file_release(struct inode * inode,struct file * file)1305 static int ntfs_file_release(struct inode *inode, struct file *file)
1306 {
1307 struct ntfs_inode *ni = ntfs_i(inode);
1308 struct ntfs_sb_info *sbi = ni->mi.sbi;
1309 int err = 0;
1310
1311 /* If we are last writer on the inode, drop the block reservation. */
1312 if (sbi->options->prealloc &&
1313 ((file->f_mode & FMODE_WRITE) &&
1314 atomic_read(&inode->i_writecount) == 1)
1315 /*
1316 * The only file when inode->i_fop = &ntfs_file_operations and
1317 * init_rwsem(&ni->file.run_lock) is not called explicitly is MFT.
1318 *
1319 * Add additional check here.
1320 */
1321 && inode->i_ino != MFT_REC_MFT) {
1322 ni_lock(ni);
1323 down_write(&ni->file.run_lock);
1324
1325 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
1326 i_size_read(inode), &ni->i_valid, false,
1327 NULL);
1328
1329 up_write(&ni->file.run_lock);
1330 ni_unlock(ni);
1331 }
1332 return err;
1333 }
1334
1335 /*
1336 * ntfs_fiemap - inode_operations::fiemap
1337 */
ntfs_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,__u64 start,__u64 len)1338 int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1339 __u64 start, __u64 len)
1340 {
1341 int err;
1342 struct ntfs_inode *ni = ntfs_i(inode);
1343
1344 /* Avoid any operation if inode is bad. */
1345 if (unlikely(is_bad_ni(ni)))
1346 return -EINVAL;
1347
1348 err = fiemap_prep(inode, fieinfo, start, &len, ~FIEMAP_FLAG_XATTR);
1349 if (err)
1350 return err;
1351
1352 ni_lock(ni);
1353
1354 err = ni_fiemap(ni, fieinfo, start, len);
1355
1356 ni_unlock(ni);
1357
1358 return err;
1359 }
1360
1361 /*
1362 * ntfs_file_splice_write - file_operations::splice_write
1363 */
ntfs_file_splice_write(struct pipe_inode_info * pipe,struct file * file,loff_t * ppos,size_t len,unsigned int flags)1364 static ssize_t ntfs_file_splice_write(struct pipe_inode_info *pipe,
1365 struct file *file, loff_t *ppos,
1366 size_t len, unsigned int flags)
1367 {
1368 ssize_t err;
1369 struct inode *inode = file_inode(file);
1370
1371 err = check_write_restriction(inode);
1372 if (err)
1373 return err;
1374
1375 return iter_file_splice_write(pipe, file, ppos, len, flags);
1376 }
1377
1378 // clang-format off
1379 const struct inode_operations ntfs_file_inode_operations = {
1380 .getattr = ntfs_getattr,
1381 .setattr = ntfs_setattr,
1382 .listxattr = ntfs_listxattr,
1383 .get_acl = ntfs_get_acl,
1384 .set_acl = ntfs_set_acl,
1385 .fiemap = ntfs_fiemap,
1386 };
1387
1388 const struct file_operations ntfs_file_operations = {
1389 .llseek = generic_file_llseek,
1390 .read_iter = ntfs_file_read_iter,
1391 .write_iter = ntfs_file_write_iter,
1392 .unlocked_ioctl = ntfs_ioctl,
1393 #ifdef CONFIG_COMPAT
1394 .compat_ioctl = ntfs_compat_ioctl,
1395 #endif
1396 .splice_read = ntfs_file_splice_read,
1397 .splice_write = ntfs_file_splice_write,
1398 .mmap_prepare = ntfs_file_mmap_prepare,
1399 .open = ntfs_file_open,
1400 .fsync = generic_file_fsync,
1401 .fallocate = ntfs_fallocate,
1402 .release = ntfs_file_release,
1403 };
1404
1405 #if IS_ENABLED(CONFIG_NTFS_FS)
1406 const struct file_operations ntfs_legacy_file_operations = {
1407 .llseek = generic_file_llseek,
1408 .read_iter = ntfs_file_read_iter,
1409 .splice_read = ntfs_file_splice_read,
1410 .open = ntfs_file_open,
1411 .release = ntfs_file_release,
1412 };
1413 #endif
1414 // clang-format on
1415