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fs/ntfs3: Fixing work with sparse clusters
[linux-block.git] / fs / ntfs3 / file.c
CommitLineData
4342306f
KK		 1// SPDX-License-Identifier: GPL-2.0
2/*
3 *
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
5 *
e8b8e97f
KA		 6 * Regular file handling primitives for NTFS-based filesystems.
7 *
4342306f 8 */
e8b8e97f 9
4342306f 10#include <linux/backing-dev.h>
ccdf7741 11#include <linux/blkdev.h>
4342306f
KK		 12#include <linux/buffer_head.h>
13#include <linux/compat.h>
14#include <linux/falloc.h>
15#include <linux/fiemap.h>
4342306f
KK		 16
17#include "debug.h"
18#include "ntfs.h"
19#include "ntfs_fs.h"
20
21static 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;
4342306f
KK		 25 int err;
26
27 if (!capable(CAP_SYS_ADMIN))
28 return -EPERM;
29
70200574 30 if (!bdev_max_discard_sectors(sbi->sb->s_bdev))
4342306f
KK		 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
7b47ef52
CH		 37 range.minlen = max_t(u32, range.minlen,
38 bdev_discard_granularity(sbi->sb->s_bdev));
4342306f
KK		 39
40 err = ntfs_trim_fs(sbi, &range);
41 if (err < 0)
42 return err;
43
44 if (copy_to_user(user_range, &range, sizeof(range)))
45 return -EFAULT;
46
47 return 0;
48}
49
50static long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg)
51{
52 struct inode *inode = file_inode(filp);
53 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
4342306f
KK		 54
55 switch (cmd) {
4342306f
KK		 56 case FITRIM:
57 return ntfs_ioctl_fitrim(sbi, arg);
58 }
e8b8e97f 59 return -ENOTTY; /* Inappropriate ioctl for device. */
4342306f
KK		 60}
61
62#ifdef CONFIG_COMPAT
63static long ntfs_compat_ioctl(struct file *filp, u32 cmd, unsigned long arg)
64
65{
66 return ntfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
67}
68#endif
69
70/*
e8b8e97f 71 * ntfs_getattr - inode_operations::getattr
4342306f
KK		 72 */
73int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
74 struct kstat *stat, u32 request_mask, u32 flags)
75{
76 struct inode *inode = d_inode(path->dentry);
77 struct ntfs_inode *ni = ntfs_i(inode);
78
79 if (is_compressed(ni))
80 stat->attributes |= STATX_ATTR_COMPRESSED;
81
82 if (is_encrypted(ni))
83 stat->attributes |= STATX_ATTR_ENCRYPTED;
84
85 stat->attributes_mask |= STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED;
86
87 generic_fillattr(mnt_userns, inode, stat);
88
89 stat->result_mask |= STATX_BTIME;
90 stat->btime = ni->i_crtime;
91 stat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */
92
93 return 0;
94}
95
96static int ntfs_extend_initialized_size(struct file *file,
97 struct ntfs_inode *ni,
98 const loff_t valid,
99 const loff_t new_valid)
100{
101 struct inode *inode = &ni->vfs_inode;
102 struct address_space *mapping = inode->i_mapping;
103 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
104 loff_t pos = valid;
105 int err;
106
107 if (is_resident(ni)) {
108 ni->i_valid = new_valid;
109 return 0;
110 }
111
112 WARN_ON(is_compressed(ni));
113 WARN_ON(valid >= new_valid);
114
115 for (;;) {
116 u32 zerofrom, len;
117 struct page *page;
4342306f
KK		 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) {
2f56a3f8
KK		 131 pos = ((loff_t)clen + vcn) << bits;
132 ni->i_valid = pos;
133 goto next;
4342306f
KK		 134 }
135 }
136
137 zerofrom = pos & (PAGE_SIZE - 1);
138 len = PAGE_SIZE - zerofrom;
139
140 if (pos + len > new_valid)
141 len = new_valid - pos;
142
652118b8 143 err = ntfs_write_begin(file, mapping, pos, len, &page, NULL);
4342306f
KK		 144 if (err)
145 goto out;
146
147 zero_user_segment(page, zerofrom, PAGE_SIZE);
148
e8b8e97f 149 /* This function in any case puts page. */
652118b8 150 err = ntfs_write_end(file, mapping, pos, len, len, page, NULL);
4342306f
KK		 151 if (err < 0)
152 goto out;
153 pos += len;
154
155next:
156 if (pos >= new_valid)
157 break;
158
159 balance_dirty_pages_ratelimited(mapping);
160 cond_resched();
161 }
162
163 return 0;
164
165out:
166 ni->i_valid = valid;
167 ntfs_inode_warn(inode, "failed to extend initialized size to %llx.",
168 new_valid);
169 return err;
170}
171
172/*
e8b8e97f 173 * ntfs_zero_range - Helper function for punch_hole.
d3624466
KK		 174 *
175 * It zeroes a range [vbo, vbo_to).
4342306f
KK		 176 */
177static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
178{
179 int err = 0;
180 struct address_space *mapping = inode->i_mapping;
181 u32 blocksize = 1 << inode->i_blkbits;
182 pgoff_t idx = vbo >> PAGE_SHIFT;
183 u32 z_start = vbo & (PAGE_SIZE - 1);
184 pgoff_t idx_end = (vbo_to + PAGE_SIZE - 1) >> PAGE_SHIFT;
185 loff_t page_off;
186 struct buffer_head *head, *bh;
187 u32 bh_next, bh_off, z_end;
188 sector_t iblock;
189 struct page *page;
190
191 for (; idx < idx_end; idx += 1, z_start = 0) {
192 page_off = (loff_t)idx << PAGE_SHIFT;
193 z_end = (page_off + PAGE_SIZE) > vbo_to ? (vbo_to - page_off)
194 : PAGE_SIZE;
195 iblock = page_off >> inode->i_blkbits;
196
197 page = find_or_create_page(mapping, idx,
198 mapping_gfp_constraint(mapping,
199 ~__GFP_FS));
200 if (!page)
201 return -ENOMEM;
202
203 if (!page_has_buffers(page))
204 create_empty_buffers(page, blocksize, 0);
205
206 bh = head = page_buffers(page);
207 bh_off = 0;
208 do {
209 bh_next = bh_off + blocksize;
210
211 if (bh_next <= z_start || bh_off >= z_end)
212 continue;
213
214 if (!buffer_mapped(bh)) {
215 ntfs_get_block(inode, iblock, bh, 0);
d3624466 216 /* Unmapped? It's a hole - nothing to do. */
4342306f
KK		 217 if (!buffer_mapped(bh))
218 continue;
219 }
220
d3624466 221 /* Ok, it's mapped. Make sure it's up-to-date. */
4342306f
KK		 222 if (PageUptodate(page))
223 set_buffer_uptodate(bh);
224
225 if (!buffer_uptodate(bh)) {
226 lock_buffer(bh);
227 bh->b_end_io = end_buffer_read_sync;
228 get_bh(bh);
1420c4a5 229 submit_bh(REQ_OP_READ, bh);
4342306f
KK		 230
231 wait_on_buffer(bh);
232 if (!buffer_uptodate(bh)) {
233 unlock_page(page);
234 put_page(page);
235 err = -EIO;
236 goto out;
237 }
238 }
239
240 mark_buffer_dirty(bh);
241
242 } while (bh_off = bh_next, iblock += 1,
243 head != (bh = bh->b_this_page));
244
245 zero_user_segment(page, z_start, z_end);
246
247 unlock_page(page);
248 put_page(page);
249 cond_resched();
250 }
251out:
252 mark_inode_dirty(inode);
253 return err;
254}
255
256/*
d3624466 257 * ntfs_sparse_cluster - Helper function to zero a new allocated clusters.
4342306f 258 *
4342306f
KK		 259 * NOTE: 512 <= cluster size <= 2M
260 */
261void ntfs_sparse_cluster(struct inode *inode, struct page *page0, CLST vcn,
262 CLST len)
263{
264 struct address_space *mapping = inode->i_mapping;
265 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
2f56a3f8
KK		 266 u8 cluster_bits = sbi->cluster_bits;
267 u64 vbo = (u64)vcn << cluster_bits;
268 u64 bytes = (u64)len << cluster_bits;
4342306f
KK		 269 u32 blocksize = 1 << inode->i_blkbits;
270 pgoff_t idx0 = page0 ? page0->index : -1;
271 loff_t vbo_clst = vbo & sbi->cluster_mask_inv;
272 loff_t end = ntfs_up_cluster(sbi, vbo + bytes);
273 pgoff_t idx = vbo_clst >> PAGE_SHIFT;
274 u32 from = vbo_clst & (PAGE_SIZE - 1);
275 pgoff_t idx_end = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
276 loff_t page_off;
277 u32 to;
278 bool partial;
279 struct page *page;
280
281 for (; idx < idx_end; idx += 1, from = 0) {
282 page = idx == idx0 ? page0 : grab_cache_page(mapping, idx);
283
284 if (!page)
285 continue;
286
287 page_off = (loff_t)idx << PAGE_SHIFT;
288 to = (page_off + PAGE_SIZE) > end ? (end - page_off)
289 : PAGE_SIZE;
290 partial = false;
291
292 if ((from || PAGE_SIZE != to) &&
293 likely(!page_has_buffers(page))) {
294 create_empty_buffers(page, blocksize, 0);
295 }
296
297 if (page_has_buffers(page)) {
298 struct buffer_head *head, *bh;
299 u32 bh_off = 0;
300
301 bh = head = page_buffers(page);
302 do {
303 u32 bh_next = bh_off + blocksize;
304
305 if (from <= bh_off && bh_next <= to) {
306 set_buffer_uptodate(bh);
307 mark_buffer_dirty(bh);
308 } else if (!buffer_uptodate(bh)) {
309 partial = true;
310 }
311 bh_off = bh_next;
312 } while (head != (bh = bh->b_this_page));
313 }
314
315 zero_user_segment(page, from, to);
316
2f56a3f8
KK		 317 if (!partial)
318 SetPageUptodate(page);
319 flush_dcache_page(page);
320 set_page_dirty(page);
4342306f
KK		 321
322 if (idx != idx0) {
323 unlock_page(page);
324 put_page(page);
325 }
326 cond_resched();
327 }
4342306f
KK		 328}
329
330/*
e8b8e97f 331 * ntfs_file_mmap - file_operations::mmap
4342306f
KK		 332 */
333static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma)
334{
335 struct address_space *mapping = file->f_mapping;
336 struct inode *inode = mapping->host;
337 struct ntfs_inode *ni = ntfs_i(inode);
338 u64 from = ((u64)vma->vm_pgoff << PAGE_SHIFT);
339 bool rw = vma->vm_flags & VM_WRITE;
340 int err;
341
342 if (is_encrypted(ni)) {
343 ntfs_inode_warn(inode, "mmap encrypted not supported");
344 return -EOPNOTSUPP;
345 }
346
347 if (is_dedup(ni)) {
348 ntfs_inode_warn(inode, "mmap deduplicated not supported");
349 return -EOPNOTSUPP;
350 }
351
352 if (is_compressed(ni) && rw) {
353 ntfs_inode_warn(inode, "mmap(write) compressed not supported");
354 return -EOPNOTSUPP;
355 }
356
357 if (rw) {
358 u64 to = min_t(loff_t, i_size_read(inode),
359 from + vma->vm_end - vma->vm_start);
360
361 if (is_sparsed(ni)) {
e8b8e97f 362 /* Allocate clusters for rw map. */
4342306f
KK		 363 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
364 CLST lcn, len;
365 CLST vcn = from >> sbi->cluster_bits;
366 CLST end = bytes_to_cluster(sbi, to);
367 bool new;
368
369 for (; vcn < end; vcn += len) {
370 err = attr_data_get_block(ni, vcn, 1, &lcn,
371 &len, &new);
372 if (err)
373 goto out;
374
375 if (!new)
376 continue;
377 ntfs_sparse_cluster(inode, NULL, vcn, 1);
378 }
379 }
380
381 if (ni->i_valid < to) {
382 if (!inode_trylock(inode)) {
383 err = -EAGAIN;
384 goto out;
385 }
386 err = ntfs_extend_initialized_size(file, ni,
387 ni->i_valid, to);
388 inode_unlock(inode);
389 if (err)
390 goto out;
391 }
392 }
393
394 err = generic_file_mmap(file, vma);
395out:
396 return err;
397}
398
399static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
400 struct file *file)
401{
402 struct ntfs_inode *ni = ntfs_i(inode);
403 struct address_space *mapping = inode->i_mapping;
404 loff_t end = pos + count;
405 bool extend_init = file && pos > ni->i_valid;
406 int err;
407
408 if (end <= inode->i_size && !extend_init)
409 return 0;
410
e8b8e97f 411 /* Mark rw ntfs as dirty. It will be cleared at umount. */
4342306f
KK		 412 ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
413
414 if (end > inode->i_size) {
415 err = ntfs_set_size(inode, end);
416 if (err)
417 goto out;
418 inode->i_size = end;
419 }
420
421 if (extend_init && !is_compressed(ni)) {
422 err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
423 if (err)
424 goto out;
425 } else {
426 err = 0;
427 }
428
429 inode->i_ctime = inode->i_mtime = current_time(inode);
430 mark_inode_dirty(inode);
431
432 if (IS_SYNC(inode)) {
433 int err2;
434
435 err = filemap_fdatawrite_range(mapping, pos, end - 1);
436 err2 = sync_mapping_buffers(mapping);
437 if (!err)
438 err = err2;
439 err2 = write_inode_now(inode, 1);
440 if (!err)
441 err = err2;
442 if (!err)
443 err = filemap_fdatawait_range(mapping, pos, end - 1);
444 }
445
446out:
447 return err;
448}
449
450static int ntfs_truncate(struct inode *inode, loff_t new_size)
451{
452 struct super_block *sb = inode->i_sb;
453 struct ntfs_inode *ni = ntfs_i(inode);
454 int err, dirty = 0;
455 u64 new_valid;
456
457 if (!S_ISREG(inode->i_mode))
458 return 0;
459
460 if (is_compressed(ni)) {
461 if (ni->i_valid > new_size)
462 ni->i_valid = new_size;
463 } else {
464 err = block_truncate_page(inode->i_mapping, new_size,
465 ntfs_get_block);
466 if (err)
467 return err;
468 }
469
470 new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size));
471
472 ni_lock(ni);
473
474 truncate_setsize(inode, new_size);
475
476 down_write(&ni->file.run_lock);
477 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
e95113ed 478 &new_valid, ni->mi.sbi->options->prealloc, NULL);
4342306f
KK		 479 up_write(&ni->file.run_lock);
480
481 if (new_valid < ni->i_valid)
482 ni->i_valid = new_valid;
483
484 ni_unlock(ni);
485
486 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
487 inode->i_ctime = inode->i_mtime = current_time(inode);
488 if (!IS_DIRSYNC(inode)) {
489 dirty = 1;
490 } else {
491 err = ntfs_sync_inode(inode);
492 if (err)
493 return err;
494 }
495
496 if (dirty)
497 mark_inode_dirty(inode);
498
499 /*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/
500
501 return 0;
502}
503
504/*
e8b8e97f
KA		 505 * ntfs_fallocate
506 *
4342306f
KK		 507 * Preallocate space for a file. This implements ntfs's fallocate file
508 * operation, which gets called from sys_fallocate system call. User
509 * space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set
510 * we just allocate clusters without zeroing them out. Otherwise we
511 * allocate and zero out clusters via an expanding truncate.
512 */
513static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
514{
515 struct inode *inode = file->f_mapping->host;
e4d2f4fd 516 struct address_space *mapping = inode->i_mapping;
4342306f
KK		 517 struct super_block *sb = inode->i_sb;
518 struct ntfs_sb_info *sbi = sb->s_fs_info;
519 struct ntfs_inode *ni = ntfs_i(inode);
520 loff_t end = vbo + len;
521 loff_t vbo_down = round_down(vbo, PAGE_SIZE);
e4d2f4fd
KK		 522 bool is_supported_holes = is_sparsed(ni) || is_compressed(ni);
523 loff_t i_size, new_size;
524 bool map_locked;
4342306f
KK		 525 int err;
526
e8b8e97f 527 /* No support for dir. */
4342306f
KK		 528 if (!S_ISREG(inode->i_mode))
529 return -EOPNOTSUPP;
530
e4d2f4fd
KK		 531 /*
532 * vfs_fallocate checks all possible combinations of mode.
533 * Do additional checks here before ntfs_set_state(dirty).
534 */
535 if (mode & FALLOC_FL_PUNCH_HOLE) {
536 if (!is_supported_holes)
537 return -EOPNOTSUPP;
538 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
539 } else if (mode & FALLOC_FL_INSERT_RANGE) {
540 if (!is_supported_holes)
541 return -EOPNOTSUPP;
542 } else if (mode &
543 ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
544 FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)) {
4342306f
KK		 545 ntfs_inode_warn(inode, "fallocate(0x%x) is not supported",
546 mode);
547 return -EOPNOTSUPP;
548 }
549
550 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
551
552 inode_lock(inode);
553 i_size = inode->i_size;
e4d2f4fd
KK		 554 new_size = max(end, i_size);
555 map_locked = false;
4342306f
KK		 556
557 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
e8b8e97f 558 /* Should never be here, see ntfs_file_open. */
4342306f
KK		 559 err = -EOPNOTSUPP;
560 goto out;
561 }
562
e4d2f4fd
KK		 563 if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE |
564 FALLOC_FL_INSERT_RANGE)) {
565 inode_dio_wait(inode);
566 filemap_invalidate_lock(mapping);
567 map_locked = true;
568 }
569
4342306f
KK		 570 if (mode & FALLOC_FL_PUNCH_HOLE) {
571 u32 frame_size;
572 loff_t mask, vbo_a, end_a, tmp;
573
2f56a3f8 574 err = filemap_write_and_wait_range(mapping, vbo, LLONG_MAX);
4342306f
KK		 575 if (err)
576 goto out;
577
4342306f
KK		 578 truncate_pagecache(inode, vbo_down);
579
4342306f
KK		 580 ni_lock(ni);
581 err = attr_punch_hole(ni, vbo, len, &frame_size);
582 ni_unlock(ni);
583 if (err != E_NTFS_NOTALIGNED)
584 goto out;
585
d3624466 586 /* Process not aligned punch. */
4342306f
KK		 587 mask = frame_size - 1;
588 vbo_a = (vbo + mask) & ~mask;
589 end_a = end & ~mask;
590
591 tmp = min(vbo_a, end);
592 if (tmp > vbo) {
593 err = ntfs_zero_range(inode, vbo, tmp);
594 if (err)
595 goto out;
596 }
597
598 if (vbo < end_a && end_a < end) {
599 err = ntfs_zero_range(inode, end_a, end);
600 if (err)
601 goto out;
602 }
603
604 /* Aligned punch_hole */
605 if (end_a > vbo_a) {
606 ni_lock(ni);
607 err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL);
608 ni_unlock(ni);
609 }
610 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
4342306f
KK		 611 /*
612 * Write tail of the last page before removed range since
613 * it will get removed from the page cache below.
614 */
e4d2f4fd 615 err = filemap_write_and_wait_range(mapping, vbo_down, vbo);
4342306f
KK		 616 if (err)
617 goto out;
618
619 /*
620 * Write data that will be shifted to preserve them
e8b8e97f 621 * when discarding page cache below.
4342306f 622 */
e4d2f4fd 623 err = filemap_write_and_wait_range(mapping, end, LLONG_MAX);
4342306f
KK		 624 if (err)
625 goto out;
626
4342306f
KK		 627 truncate_pagecache(inode, vbo_down);
628
629 ni_lock(ni);
630 err = attr_collapse_range(ni, vbo, len);
631 ni_unlock(ni);
e4d2f4fd
KK		 632 } else if (mode & FALLOC_FL_INSERT_RANGE) {
633 /* Check new size. */
634 err = inode_newsize_ok(inode, new_size);
635 if (err)
636 goto out;
637
638 /* Write out all dirty pages. */
639 err = filemap_write_and_wait_range(mapping, vbo_down,
640 LLONG_MAX);
641 if (err)
642 goto out;
643 truncate_pagecache(inode, vbo_down);
11434697 644
e4d2f4fd
KK		 645 ni_lock(ni);
646 err = attr_insert_range(ni, vbo, len);
647 ni_unlock(ni);
4342306f 648 } else {
e4d2f4fd 649 /* Check new size. */
b3e04872
KK		 650
651 /* generic/213: expected -ENOSPC instead of -EFBIG. */
652 if (!is_supported_holes) {
653 loff_t to_alloc = new_size - inode_get_bytes(inode);
654
655 if (to_alloc > 0 &&
656 (to_alloc >> sbi->cluster_bits) >
657 wnd_zeroes(&sbi->used.bitmap)) {
658 err = -ENOSPC;
659 goto out;
660 }
661 }
11434697
KK		 662
663 err = inode_newsize_ok(inode, new_size);
664 if (err)
665 goto out;
666
e4d2f4fd
KK		 667 /*
668 * Allocate clusters, do not change 'valid' size.
669 */
11434697 670 err = ntfs_set_size(inode, new_size);
4342306f
KK		 671 if (err)
672 goto out;
673
e4d2f4fd 674 if (is_supported_holes) {
2f56a3f8 675 CLST vcn_v = bytes_to_cluster(sbi, ni->i_valid);
4342306f
KK		 676 CLST vcn = vbo >> sbi->cluster_bits;
677 CLST cend = bytes_to_cluster(sbi, end);
678 CLST lcn, clen;
679 bool new;
680
681 /*
e8b8e97f
KA		 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?
4342306f
KK		 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 /*
e8b8e97f
KA		 696 * Unwritten area.
697 * NTFS is not able to store several unwritten areas.
698 * Activate 'ntfs_sparse_cluster' to zero new allocated clusters.
4342306f
KK		 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
e8b8e97f 704 * xfstest 016/086 will fail without 'ntfs_sparse_cluster'.
4342306f
KK		 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);
e8b8e97f 713 /* True - Keep preallocated. */
4342306f
KK		 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
721out:
e4d2f4fd
KK		 722 if (map_locked)
723 filemap_invalidate_unlock(mapping);
4342306f
KK		 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/*
e8b8e97f 735 * ntfs3_setattr - inode_operations::setattr
4342306f
KK		 736 */
737int 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
28a941ff 748 if (sbi->options->noacsrules) {
e8b8e97f 749 /* "No access rules" - Force any changes of time etc. */
4342306f 750 attr->ia_valid |= ATTR_FORCE;
e8b8e97f 751 /* and disable for editing some attributes. */
4342306f
KK		 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)) {
e8b8e97f 764 /* Should never be here, see ntfs_file_open(). */
4342306f
KK		 765 err = -EOPNOTSUPP;
766 goto out;
767 }
768 inode_dio_wait(inode);
769
3880f2b8 770 if (attr->ia_size <= oldsize)
4342306f
KK		 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
e8b8e97f 788 /* Linux 'w' -> Windows 'ro'. */
4342306f
KK		 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);
798out:
799 return err;
800}
801
802static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
803{
4342306f
KK		 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
dd854e4b 832 return generic_file_read_iter(iocb, iter);
4342306f
KK		 833}
834
e8b8e97f
KA		 835/*
836 * ntfs_get_frame_pages
837 *
838 * Return: Array of locked pages.
839 */
4342306f
KK		 840static 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
e8b8e97f
KA		 872/*
873 * ntfs_compress_write - Helper for ntfs_file_write_iter() (compressed files).
874 */
4342306f
KK		 875static 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
345482bc 907 pages = kmalloc_array(pages_per_frame, sizeof(struct page *), GFP_NOFS);
4342306f
KK		 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
e8b8e97f 920 /* Zero range [valid : pos). */
4342306f
KK		 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
e8b8e97f 939 /* Load full frame. */
4342306f
KK		 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
e8b8e97f 985 /* Copy user data [pos : pos + count). */
4342306f
KK		 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
4342306f
KK		 994 frame_vbo = pos & ~(frame_size - 1);
995 index = frame_vbo >> PAGE_SHIFT;
996
a6294593 997 if (unlikely(fault_in_iov_iter_readable(from, bytes))) {
4342306f
KK		 998 err = -EFAULT;
999 goto out;
1000 }
1001
e8b8e97f 1002 /* Load full frame. */
4342306f
KK		 1003 err = ntfs_get_frame_pages(mapping, index, pages,
1004 pages_per_frame, &frame_uptodate);
1005 if (err)
1006 goto out;
1007
1008 if (!frame_uptodate) {
1009 loff_t to = pos + bytes;
1010
1011 if (off || (to < i_size && (to & (frame_size - 1)))) {
1012 err = ni_read_frame(ni, frame_vbo, pages,
1013 pages_per_frame);
1014 if (err) {
1015 for (ip = 0; ip < pages_per_frame;
1016 ip++) {
1017 page = pages[ip];
1018 unlock_page(page);
1019 put_page(page);
1020 }
1021 goto out;
1022 }
1023 }
1024 }
1025
1026 WARN_ON(!bytes);
1027 copied = 0;
1028 ip = off >> PAGE_SHIFT;
1029 off = offset_in_page(pos);
1030
e8b8e97f 1031 /* Copy user data to pages. */
4342306f
KK		 1032 for (;;) {
1033 size_t cp, tail = PAGE_SIZE - off;
1034
1035 page = pages[ip];
1036 cp = copy_page_from_iter_atomic(page, off,
1037 min(tail, bytes), from);
1038 flush_dcache_page(page);
1039
1040 copied += cp;
1041 bytes -= cp;
1042 if (!bytes || !cp)
1043 break;
1044
1045 if (cp < tail) {
1046 off += cp;
1047 } else {
1048 ip++;
1049 off = 0;
1050 }
1051 }
1052
1053 ni_lock(ni);
1054 err = ni_write_frame(ni, pages, pages_per_frame);
1055 ni_unlock(ni);
1056
1057 for (ip = 0; ip < pages_per_frame; ip++) {
1058 page = pages[ip];
1059 ClearPageDirty(page);
1060 SetPageUptodate(page);
1061 unlock_page(page);
1062 put_page(page);
1063 }
1064
1065 if (err)
1066 goto out;
1067
1068 /*
1069 * We can loop for a long time in here. Be nice and allow
1070 * us to schedule out to avoid softlocking if preempt
1071 * is disabled.
1072 */
1073 cond_resched();
1074
1075 pos += copied;
1076 written += copied;
1077
1078 count = iov_iter_count(from);
1079 }
1080
1081out:
195c52bd 1082 kfree(pages);
4342306f
KK		 1083
1084 current->backing_dev_info = NULL;
1085
1086 if (err < 0)
1087 return err;
1088
1089 iocb->ki_pos += written;
1090 if (iocb->ki_pos > ni->i_valid)
1091 ni->i_valid = iocb->ki_pos;
1092
1093 return written;
1094}
1095
1096/*
e8b8e97f 1097 * ntfs_file_write_iter - file_operations::write_iter
4342306f
KK		 1098 */
1099static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1100{
1101 struct file *file = iocb->ki_filp;
1102 struct address_space *mapping = file->f_mapping;
1103 struct inode *inode = mapping->host;
1104 ssize_t ret;
1105 struct ntfs_inode *ni = ntfs_i(inode);
1106
1107 if (is_encrypted(ni)) {
1108 ntfs_inode_warn(inode, "encrypted i/o not supported");
1109 return -EOPNOTSUPP;
1110 }
1111
1112 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
1113 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
1114 return -EOPNOTSUPP;
1115 }
1116
1117 if (is_dedup(ni)) {
1118 ntfs_inode_warn(inode, "write into deduplicated not supported");
1119 return -EOPNOTSUPP;
1120 }
1121
1122 if (!inode_trylock(inode)) {
1123 if (iocb->ki_flags & IOCB_NOWAIT)
1124 return -EAGAIN;
1125 inode_lock(inode);
1126 }
1127
1128 ret = generic_write_checks(iocb, from);
1129 if (ret <= 0)
1130 goto out;
1131
1132 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
d3624466 1133 /* Should never be here, see ntfs_file_open(). */
4342306f
KK		 1134 ret = -EOPNOTSUPP;
1135 goto out;
1136 }
1137
1138 ret = ntfs_extend(inode, iocb->ki_pos, ret, file);
1139 if (ret)
1140 goto out;
1141
1142 ret = is_compressed(ni) ? ntfs_compress_write(iocb, from)
1143 : __generic_file_write_iter(iocb, from);
1144
1145out:
1146 inode_unlock(inode);
1147
1148 if (ret > 0)
1149 ret = generic_write_sync(iocb, ret);
1150
1151 return ret;
1152}
1153
1154/*
e8b8e97f 1155 * ntfs_file_open - file_operations::open
4342306f
KK		 1156 */
1157int ntfs_file_open(struct inode *inode, struct file *file)
1158{
1159 struct ntfs_inode *ni = ntfs_i(inode);
1160
1161 if (unlikely((is_compressed(ni) || is_encrypted(ni)) &&
1162 (file->f_flags & O_DIRECT))) {
1163 return -EOPNOTSUPP;
1164 }
1165
e8b8e97f 1166 /* Decompress "external compressed" file if opened for rw. */
4342306f
KK		 1167 if ((ni->ni_flags & NI_FLAG_COMPRESSED_MASK) &&
1168 (file->f_flags & (O_WRONLY | O_RDWR | O_TRUNC))) {
1169#ifdef CONFIG_NTFS3_LZX_XPRESS
1170 int err = ni_decompress_file(ni);
1171
1172 if (err)
1173 return err;
1174#else
1175 ntfs_inode_warn(
1176 inode,
1177 "activate CONFIG_NTFS3_LZX_XPRESS to write external compressed files");
1178 return -EOPNOTSUPP;
1179#endif
1180 }
1181
1182 return generic_file_open(inode, file);
1183}
1184
1185/*
e8b8e97f 1186 * ntfs_file_release - file_operations::release
4342306f
KK		 1187 */
1188static int ntfs_file_release(struct inode *inode, struct file *file)
1189{
1190 struct ntfs_inode *ni = ntfs_i(inode);
1191 struct ntfs_sb_info *sbi = ni->mi.sbi;
1192 int err = 0;
1193
e8b8e97f 1194 /* If we are last writer on the inode, drop the block reservation. */
564c97bd 1195 if (sbi->options->prealloc && ((file->f_mode & FMODE_WRITE) &&
4342306f
KK		 1196 atomic_read(&inode->i_writecount) == 1)) {
1197 ni_lock(ni);
1198 down_write(&ni->file.run_lock);
1199
1200 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
1201 inode->i_size, &ni->i_valid, false, NULL);
1202
1203 up_write(&ni->file.run_lock);
1204 ni_unlock(ni);
1205 }
1206 return err;
1207}
1208
e8b8e97f
KA		 1209/*
1210 * ntfs_fiemap - file_operations::fiemap
1211 */
4342306f
KK		 1212int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1213 __u64 start, __u64 len)
1214{
1215 int err;
1216 struct ntfs_inode *ni = ntfs_i(inode);
1217
d4e8e135
KA		 1218 err = fiemap_prep(inode, fieinfo, start, &len, ~FIEMAP_FLAG_XATTR);
1219 if (err)
1220 return err;
4342306f
KK		 1221
1222 ni_lock(ni);
1223
1224 err = ni_fiemap(ni, fieinfo, start, len);
1225
1226 ni_unlock(ni);
1227
1228 return err;
1229}
1230
1231// clang-format off
1232const struct inode_operations ntfs_file_inode_operations = {
1233 .getattr = ntfs_getattr,
1234 .setattr = ntfs3_setattr,
1235 .listxattr = ntfs_listxattr,
1236 .permission = ntfs_permission,
1237 .get_acl = ntfs_get_acl,
1238 .set_acl = ntfs_set_acl,
1239 .fiemap = ntfs_fiemap,
1240};
1241
1242const struct file_operations ntfs_file_operations = {
1243 .llseek = generic_file_llseek,
1244 .read_iter = ntfs_file_read_iter,
1245 .write_iter = ntfs_file_write_iter,
1246 .unlocked_ioctl = ntfs_ioctl,
1247#ifdef CONFIG_COMPAT
1248 .compat_ioctl = ntfs_compat_ioctl,
1249#endif
1250 .splice_read = generic_file_splice_read,
1251 .mmap = ntfs_file_mmap,
1252 .open = ntfs_file_open,
1253 .fsync = generic_file_fsync,
1254 .splice_write = iter_file_splice_write,
1255 .fallocate = ntfs_fallocate,
1256 .release = ntfs_file_release,
1257};
1258// clang-format on
Linux 6.x block layer and io_uring tree(s)