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fs: pass dentry to set acl method
[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) {
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
652118b8 159 err = ntfs_write_begin(file, mapping, pos, len, &page, NULL);
4342306f
KK		 160 if (err)
161 goto out;
162
163 zero_user_segment(page, zerofrom, PAGE_SIZE);
164
e8b8e97f 165 /* This function in any case puts page. */
652118b8 166 err = ntfs_write_end(file, mapping, pos, len, len, page, NULL);
4342306f
KK		 167 if (err < 0)
168 goto out;
169 pos += len;
170
171next:
172 if (pos >= new_valid)
173 break;
174
175 balance_dirty_pages_ratelimited(mapping);
176 cond_resched();
177 }
178
179 return 0;
180
181out:
182 ni->i_valid = valid;
183 ntfs_inode_warn(inode, "failed to extend initialized size to %llx.",
184 new_valid);
185 return err;
186}
187
188/*
e8b8e97f 189 * ntfs_zero_range - Helper function for punch_hole.
d3624466
KK		 190 *
191 * It zeroes a range [vbo, vbo_to).
4342306f
KK		 192 */
193static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
194{
195 int err = 0;
196 struct address_space *mapping = inode->i_mapping;
197 u32 blocksize = 1 << inode->i_blkbits;
198 pgoff_t idx = vbo >> PAGE_SHIFT;
199 u32 z_start = vbo & (PAGE_SIZE - 1);
200 pgoff_t idx_end = (vbo_to + PAGE_SIZE - 1) >> PAGE_SHIFT;
201 loff_t page_off;
202 struct buffer_head *head, *bh;
203 u32 bh_next, bh_off, z_end;
204 sector_t iblock;
205 struct page *page;
206
207 for (; idx < idx_end; idx += 1, z_start = 0) {
208 page_off = (loff_t)idx << PAGE_SHIFT;
209 z_end = (page_off + PAGE_SIZE) > vbo_to ? (vbo_to - page_off)
210 : PAGE_SIZE;
211 iblock = page_off >> inode->i_blkbits;
212
213 page = find_or_create_page(mapping, idx,
214 mapping_gfp_constraint(mapping,
215 ~__GFP_FS));
216 if (!page)
217 return -ENOMEM;
218
219 if (!page_has_buffers(page))
220 create_empty_buffers(page, blocksize, 0);
221
222 bh = head = page_buffers(page);
223 bh_off = 0;
224 do {
225 bh_next = bh_off + blocksize;
226
227 if (bh_next <= z_start || bh_off >= z_end)
228 continue;
229
230 if (!buffer_mapped(bh)) {
231 ntfs_get_block(inode, iblock, bh, 0);
d3624466 232 /* Unmapped? It's a hole - nothing to do. */
4342306f
KK		 233 if (!buffer_mapped(bh))
234 continue;
235 }
236
d3624466 237 /* Ok, it's mapped. Make sure it's up-to-date. */
4342306f
KK		 238 if (PageUptodate(page))
239 set_buffer_uptodate(bh);
240
241 if (!buffer_uptodate(bh)) {
242 lock_buffer(bh);
243 bh->b_end_io = end_buffer_read_sync;
244 get_bh(bh);
1420c4a5 245 submit_bh(REQ_OP_READ, bh);
4342306f
KK		 246
247 wait_on_buffer(bh);
248 if (!buffer_uptodate(bh)) {
249 unlock_page(page);
250 put_page(page);
251 err = -EIO;
252 goto out;
253 }
254 }
255
256 mark_buffer_dirty(bh);
257
258 } while (bh_off = bh_next, iblock += 1,
259 head != (bh = bh->b_this_page));
260
261 zero_user_segment(page, z_start, z_end);
262
263 unlock_page(page);
264 put_page(page);
265 cond_resched();
266 }
267out:
268 mark_inode_dirty(inode);
269 return err;
270}
271
272/*
d3624466 273 * ntfs_sparse_cluster - Helper function to zero a new allocated clusters.
4342306f 274 *
4342306f
KK		 275 * NOTE: 512 <= cluster size <= 2M
276 */
277void ntfs_sparse_cluster(struct inode *inode, struct page *page0, CLST vcn,
278 CLST len)
279{
280 struct address_space *mapping = inode->i_mapping;
281 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
282 u64 vbo = (u64)vcn << sbi->cluster_bits;
283 u64 bytes = (u64)len << sbi->cluster_bits;
284 u32 blocksize = 1 << inode->i_blkbits;
285 pgoff_t idx0 = page0 ? page0->index : -1;
286 loff_t vbo_clst = vbo & sbi->cluster_mask_inv;
287 loff_t end = ntfs_up_cluster(sbi, vbo + bytes);
288 pgoff_t idx = vbo_clst >> PAGE_SHIFT;
289 u32 from = vbo_clst & (PAGE_SIZE - 1);
290 pgoff_t idx_end = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
291 loff_t page_off;
292 u32 to;
293 bool partial;
294 struct page *page;
295
296 for (; idx < idx_end; idx += 1, from = 0) {
297 page = idx == idx0 ? page0 : grab_cache_page(mapping, idx);
298
299 if (!page)
300 continue;
301
302 page_off = (loff_t)idx << PAGE_SHIFT;
303 to = (page_off + PAGE_SIZE) > end ? (end - page_off)
304 : PAGE_SIZE;
305 partial = false;
306
307 if ((from || PAGE_SIZE != to) &&
308 likely(!page_has_buffers(page))) {
309 create_empty_buffers(page, blocksize, 0);
310 }
311
312 if (page_has_buffers(page)) {
313 struct buffer_head *head, *bh;
314 u32 bh_off = 0;
315
316 bh = head = page_buffers(page);
317 do {
318 u32 bh_next = bh_off + blocksize;
319
320 if (from <= bh_off && bh_next <= to) {
321 set_buffer_uptodate(bh);
322 mark_buffer_dirty(bh);
323 } else if (!buffer_uptodate(bh)) {
324 partial = true;
325 }
326 bh_off = bh_next;
327 } while (head != (bh = bh->b_this_page));
328 }
329
330 zero_user_segment(page, from, to);
331
332 if (!partial) {
333 if (!PageUptodate(page))
334 SetPageUptodate(page);
335 set_page_dirty(page);
336 }
337
338 if (idx != idx0) {
339 unlock_page(page);
340 put_page(page);
341 }
342 cond_resched();
343 }
344 mark_inode_dirty(inode);
345}
346
347/*
e8b8e97f 348 * ntfs_file_mmap - file_operations::mmap
4342306f
KK		 349 */
350static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma)
351{
352 struct address_space *mapping = file->f_mapping;
353 struct inode *inode = mapping->host;
354 struct ntfs_inode *ni = ntfs_i(inode);
355 u64 from = ((u64)vma->vm_pgoff << PAGE_SHIFT);
356 bool rw = vma->vm_flags & VM_WRITE;
357 int err;
358
359 if (is_encrypted(ni)) {
360 ntfs_inode_warn(inode, "mmap encrypted not supported");
361 return -EOPNOTSUPP;
362 }
363
364 if (is_dedup(ni)) {
365 ntfs_inode_warn(inode, "mmap deduplicated not supported");
366 return -EOPNOTSUPP;
367 }
368
369 if (is_compressed(ni) && rw) {
370 ntfs_inode_warn(inode, "mmap(write) compressed not supported");
371 return -EOPNOTSUPP;
372 }
373
374 if (rw) {
375 u64 to = min_t(loff_t, i_size_read(inode),
376 from + vma->vm_end - vma->vm_start);
377
378 if (is_sparsed(ni)) {
e8b8e97f 379 /* Allocate clusters for rw map. */
4342306f
KK		 380 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
381 CLST lcn, len;
382 CLST vcn = from >> sbi->cluster_bits;
383 CLST end = bytes_to_cluster(sbi, to);
384 bool new;
385
386 for (; vcn < end; vcn += len) {
387 err = attr_data_get_block(ni, vcn, 1, &lcn,
388 &len, &new);
389 if (err)
390 goto out;
391
392 if (!new)
393 continue;
394 ntfs_sparse_cluster(inode, NULL, vcn, 1);
395 }
396 }
397
398 if (ni->i_valid < to) {
399 if (!inode_trylock(inode)) {
400 err = -EAGAIN;
401 goto out;
402 }
403 err = ntfs_extend_initialized_size(file, ni,
404 ni->i_valid, to);
405 inode_unlock(inode);
406 if (err)
407 goto out;
408 }
409 }
410
411 err = generic_file_mmap(file, vma);
412out:
413 return err;
414}
415
416static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
417 struct file *file)
418{
419 struct ntfs_inode *ni = ntfs_i(inode);
420 struct address_space *mapping = inode->i_mapping;
421 loff_t end = pos + count;
422 bool extend_init = file && pos > ni->i_valid;
423 int err;
424
425 if (end <= inode->i_size && !extend_init)
426 return 0;
427
e8b8e97f 428 /* Mark rw ntfs as dirty. It will be cleared at umount. */
4342306f
KK		 429 ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
430
431 if (end > inode->i_size) {
432 err = ntfs_set_size(inode, end);
433 if (err)
434 goto out;
435 inode->i_size = end;
436 }
437
438 if (extend_init && !is_compressed(ni)) {
439 err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
440 if (err)
441 goto out;
442 } else {
443 err = 0;
444 }
445
446 inode->i_ctime = inode->i_mtime = current_time(inode);
447 mark_inode_dirty(inode);
448
449 if (IS_SYNC(inode)) {
450 int err2;
451
452 err = filemap_fdatawrite_range(mapping, pos, end - 1);
453 err2 = sync_mapping_buffers(mapping);
454 if (!err)
455 err = err2;
456 err2 = write_inode_now(inode, 1);
457 if (!err)
458 err = err2;
459 if (!err)
460 err = filemap_fdatawait_range(mapping, pos, end - 1);
461 }
462
463out:
464 return err;
465}
466
467static int ntfs_truncate(struct inode *inode, loff_t new_size)
468{
469 struct super_block *sb = inode->i_sb;
470 struct ntfs_inode *ni = ntfs_i(inode);
471 int err, dirty = 0;
472 u64 new_valid;
473
474 if (!S_ISREG(inode->i_mode))
475 return 0;
476
477 if (is_compressed(ni)) {
478 if (ni->i_valid > new_size)
479 ni->i_valid = new_size;
480 } else {
481 err = block_truncate_page(inode->i_mapping, new_size,
482 ntfs_get_block);
483 if (err)
484 return err;
485 }
486
487 new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size));
488
489 ni_lock(ni);
490
491 truncate_setsize(inode, new_size);
492
493 down_write(&ni->file.run_lock);
494 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
e95113ed 495 &new_valid, ni->mi.sbi->options->prealloc, NULL);
4342306f
KK		 496 up_write(&ni->file.run_lock);
497
498 if (new_valid < ni->i_valid)
499 ni->i_valid = new_valid;
500
501 ni_unlock(ni);
502
503 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
504 inode->i_ctime = inode->i_mtime = current_time(inode);
505 if (!IS_DIRSYNC(inode)) {
506 dirty = 1;
507 } else {
508 err = ntfs_sync_inode(inode);
509 if (err)
510 return err;
511 }
512
513 if (dirty)
514 mark_inode_dirty(inode);
515
516 /*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/
517
518 return 0;
519}
520
521/*
e8b8e97f
KA		 522 * ntfs_fallocate
523 *
4342306f
KK		 524 * Preallocate space for a file. This implements ntfs's fallocate file
525 * operation, which gets called from sys_fallocate system call. User
526 * space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set
527 * we just allocate clusters without zeroing them out. Otherwise we
528 * allocate and zero out clusters via an expanding truncate.
529 */
530static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
531{
532 struct inode *inode = file->f_mapping->host;
e4d2f4fd 533 struct address_space *mapping = inode->i_mapping;
4342306f
KK		 534 struct super_block *sb = inode->i_sb;
535 struct ntfs_sb_info *sbi = sb->s_fs_info;
536 struct ntfs_inode *ni = ntfs_i(inode);
537 loff_t end = vbo + len;
538 loff_t vbo_down = round_down(vbo, PAGE_SIZE);
e4d2f4fd
KK		 539 bool is_supported_holes = is_sparsed(ni) || is_compressed(ni);
540 loff_t i_size, new_size;
541 bool map_locked;
4342306f
KK		 542 int err;
543
e8b8e97f 544 /* No support for dir. */
4342306f
KK		 545 if (!S_ISREG(inode->i_mode))
546 return -EOPNOTSUPP;
547
e4d2f4fd
KK		 548 /*
549 * vfs_fallocate checks all possible combinations of mode.
550 * Do additional checks here before ntfs_set_state(dirty).
551 */
552 if (mode & FALLOC_FL_PUNCH_HOLE) {
553 if (!is_supported_holes)
554 return -EOPNOTSUPP;
555 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
556 } else if (mode & FALLOC_FL_INSERT_RANGE) {
557 if (!is_supported_holes)
558 return -EOPNOTSUPP;
559 } else if (mode &
560 ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
561 FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)) {
4342306f
KK		 562 ntfs_inode_warn(inode, "fallocate(0x%x) is not supported",
563 mode);
564 return -EOPNOTSUPP;
565 }
566
567 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
568
569 inode_lock(inode);
570 i_size = inode->i_size;
e4d2f4fd
KK		 571 new_size = max(end, i_size);
572 map_locked = false;
4342306f
KK		 573
574 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
e8b8e97f 575 /* Should never be here, see ntfs_file_open. */
4342306f
KK		 576 err = -EOPNOTSUPP;
577 goto out;
578 }
579
e4d2f4fd
KK		 580 if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE |
581 FALLOC_FL_INSERT_RANGE)) {
582 inode_dio_wait(inode);
583 filemap_invalidate_lock(mapping);
584 map_locked = true;
585 }
586
4342306f
KK		 587 if (mode & FALLOC_FL_PUNCH_HOLE) {
588 u32 frame_size;
589 loff_t mask, vbo_a, end_a, tmp;
590
e4d2f4fd 591 err = filemap_write_and_wait_range(mapping, vbo, end - 1);
4342306f
KK		 592 if (err)
593 goto out;
594
e4d2f4fd 595 err = filemap_write_and_wait_range(mapping, end, LLONG_MAX);
4342306f
KK		 596 if (err)
597 goto out;
598
4342306f
KK		 599 truncate_pagecache(inode, vbo_down);
600
4342306f
KK		 601 ni_lock(ni);
602 err = attr_punch_hole(ni, vbo, len, &frame_size);
603 ni_unlock(ni);
604 if (err != E_NTFS_NOTALIGNED)
605 goto out;
606
d3624466 607 /* Process not aligned punch. */
4342306f
KK		 608 mask = frame_size - 1;
609 vbo_a = (vbo + mask) & ~mask;
610 end_a = end & ~mask;
611
612 tmp = min(vbo_a, end);
613 if (tmp > vbo) {
614 err = ntfs_zero_range(inode, vbo, tmp);
615 if (err)
616 goto out;
617 }
618
619 if (vbo < end_a && end_a < end) {
620 err = ntfs_zero_range(inode, end_a, end);
621 if (err)
622 goto out;
623 }
624
625 /* Aligned punch_hole */
626 if (end_a > vbo_a) {
627 ni_lock(ni);
628 err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL);
629 ni_unlock(ni);
630 }
631 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
4342306f
KK		 632 /*
633 * Write tail of the last page before removed range since
634 * it will get removed from the page cache below.
635 */
e4d2f4fd 636 err = filemap_write_and_wait_range(mapping, vbo_down, vbo);
4342306f
KK		 637 if (err)
638 goto out;
639
640 /*
641 * Write data that will be shifted to preserve them
e8b8e97f 642 * when discarding page cache below.
4342306f 643 */
e4d2f4fd 644 err = filemap_write_and_wait_range(mapping, end, LLONG_MAX);
4342306f
KK		 645 if (err)
646 goto out;
647
4342306f
KK		 648 truncate_pagecache(inode, vbo_down);
649
650 ni_lock(ni);
651 err = attr_collapse_range(ni, vbo, len);
652 ni_unlock(ni);
e4d2f4fd
KK		 653 } else if (mode & FALLOC_FL_INSERT_RANGE) {
654 /* Check new size. */
655 err = inode_newsize_ok(inode, new_size);
656 if (err)
657 goto out;
658
659 /* Write out all dirty pages. */
660 err = filemap_write_and_wait_range(mapping, vbo_down,
661 LLONG_MAX);
662 if (err)
663 goto out;
664 truncate_pagecache(inode, vbo_down);
11434697 665
e4d2f4fd
KK		 666 ni_lock(ni);
667 err = attr_insert_range(ni, vbo, len);
668 ni_unlock(ni);
4342306f 669 } else {
e4d2f4fd 670 /* Check new size. */
b3e04872
KK		 671
672 /* generic/213: expected -ENOSPC instead of -EFBIG. */
673 if (!is_supported_holes) {
674 loff_t to_alloc = new_size - inode_get_bytes(inode);
675
676 if (to_alloc > 0 &&
677 (to_alloc >> sbi->cluster_bits) >
678 wnd_zeroes(&sbi->used.bitmap)) {
679 err = -ENOSPC;
680 goto out;
681 }
682 }
11434697
KK		 683
684 err = inode_newsize_ok(inode, new_size);
685 if (err)
686 goto out;
687
e4d2f4fd
KK		 688 /*
689 * Allocate clusters, do not change 'valid' size.
690 */
11434697 691 err = ntfs_set_size(inode, new_size);
4342306f
KK		 692 if (err)
693 goto out;
694
e4d2f4fd 695 if (is_supported_holes) {
4342306f
KK		 696 CLST vcn_v = ni->i_valid >> sbi->cluster_bits;
697 CLST vcn = vbo >> sbi->cluster_bits;
698 CLST cend = bytes_to_cluster(sbi, end);
699 CLST lcn, clen;
700 bool new;
701
702 /*
e8b8e97f
KA		 703 * Allocate but do not zero new clusters. (see below comments)
704 * This breaks security: One can read unused on-disk areas.
705 * Zeroing these clusters may be too long.
706 * Maybe we should check here for root rights?
4342306f
KK		 707 */
708 for (; vcn < cend; vcn += clen) {
709 err = attr_data_get_block(ni, vcn, cend - vcn,
710 &lcn, &clen, &new);
711 if (err)
712 goto out;
713 if (!new || vcn >= vcn_v)
714 continue;
715
716 /*
e8b8e97f
KA		 717 * Unwritten area.
718 * NTFS is not able to store several unwritten areas.
719 * Activate 'ntfs_sparse_cluster' to zero new allocated clusters.
4342306f
KK		 720 *
721 * Dangerous in case:
722 * 1G of sparsed clusters + 1 cluster of data =>
723 * valid_size == 1G + 1 cluster
724 * fallocate(1G) will zero 1G and this can be very long
e8b8e97f 725 * xfstest 016/086 will fail without 'ntfs_sparse_cluster'.
4342306f
KK		 726 */
727 ntfs_sparse_cluster(inode, NULL, vcn,
728 min(vcn_v - vcn, clen));
729 }
730 }
731
732 if (mode & FALLOC_FL_KEEP_SIZE) {
733 ni_lock(ni);
e8b8e97f 734 /* True - Keep preallocated. */
4342306f
KK		 735 err = attr_set_size(ni, ATTR_DATA, NULL, 0,
736 &ni->file.run, i_size, &ni->i_valid,
737 true, NULL);
738 ni_unlock(ni);
739 }
740 }
741
742out:
e4d2f4fd
KK		 743 if (map_locked)
744 filemap_invalidate_unlock(mapping);
4342306f
KK		 745
746 if (!err) {
747 inode->i_ctime = inode->i_mtime = current_time(inode);
748 mark_inode_dirty(inode);
749 }
750
751 inode_unlock(inode);
752 return err;
753}
754
755/*
e8b8e97f 756 * ntfs3_setattr - inode_operations::setattr
4342306f
KK		 757 */
758int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
759 struct iattr *attr)
760{
761 struct super_block *sb = dentry->d_sb;
762 struct ntfs_sb_info *sbi = sb->s_fs_info;
763 struct inode *inode = d_inode(dentry);
764 struct ntfs_inode *ni = ntfs_i(inode);
765 u32 ia_valid = attr->ia_valid;
766 umode_t mode = inode->i_mode;
767 int err;
768
28a941ff 769 if (sbi->options->noacsrules) {
e8b8e97f 770 /* "No access rules" - Force any changes of time etc. */
4342306f 771 attr->ia_valid |= ATTR_FORCE;
e8b8e97f 772 /* and disable for editing some attributes. */
4342306f
KK		 773 attr->ia_valid &= ~(ATTR_UID | ATTR_GID | ATTR_MODE);
774 ia_valid = attr->ia_valid;
775 }
776
777 err = setattr_prepare(mnt_userns, dentry, attr);
778 if (err)
779 goto out;
780
781 if (ia_valid & ATTR_SIZE) {
782 loff_t oldsize = inode->i_size;
783
784 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
e8b8e97f 785 /* Should never be here, see ntfs_file_open(). */
4342306f
KK		 786 err = -EOPNOTSUPP;
787 goto out;
788 }
789 inode_dio_wait(inode);
790
3880f2b8 791 if (attr->ia_size <= oldsize)
4342306f
KK		 792 err = ntfs_truncate(inode, attr->ia_size);
793 else if (attr->ia_size > oldsize)
794 err = ntfs_extend(inode, attr->ia_size, 0, NULL);
795
796 if (err)
797 goto out;
798
799 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
800 }
801
802 setattr_copy(mnt_userns, inode, attr);
803
804 if (mode != inode->i_mode) {
138060ba 805 err = ntfs_acl_chmod(mnt_userns, dentry);
4342306f
KK		 806 if (err)
807 goto out;
808
e8b8e97f 809 /* Linux 'w' -> Windows 'ro'. */
4342306f
KK		 810 if (0222 & inode->i_mode)
811 ni->std_fa &= ~FILE_ATTRIBUTE_READONLY;
812 else
813 ni->std_fa |= FILE_ATTRIBUTE_READONLY;
814 }
815
816 if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE))
817 ntfs_save_wsl_perm(inode);
818 mark_inode_dirty(inode);
819out:
820 return err;
821}
822
823static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
824{
4342306f
KK		 825 struct file *file = iocb->ki_filp;
826 struct inode *inode = file->f_mapping->host;
827 struct ntfs_inode *ni = ntfs_i(inode);
828
829 if (is_encrypted(ni)) {
830 ntfs_inode_warn(inode, "encrypted i/o not supported");
831 return -EOPNOTSUPP;
832 }
833
834 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
835 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
836 return -EOPNOTSUPP;
837 }
838
839#ifndef CONFIG_NTFS3_LZX_XPRESS
840 if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) {
841 ntfs_inode_warn(
842 inode,
843 "activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files");
844 return -EOPNOTSUPP;
845 }
846#endif
847
848 if (is_dedup(ni)) {
849 ntfs_inode_warn(inode, "read deduplicated not supported");
850 return -EOPNOTSUPP;
851 }
852
dd854e4b 853 return generic_file_read_iter(iocb, iter);
4342306f
KK		 854}
855
e8b8e97f
KA		 856/*
857 * ntfs_get_frame_pages
858 *
859 * Return: Array of locked pages.
860 */
4342306f
KK		 861static int ntfs_get_frame_pages(struct address_space *mapping, pgoff_t index,
862 struct page **pages, u32 pages_per_frame,
863 bool *frame_uptodate)
864{
865 gfp_t gfp_mask = mapping_gfp_mask(mapping);
866 u32 npages;
867
868 *frame_uptodate = true;
869
870 for (npages = 0; npages < pages_per_frame; npages++, index++) {
871 struct page *page;
872
873 page = find_or_create_page(mapping, index, gfp_mask);
874 if (!page) {
875 while (npages--) {
876 page = pages[npages];
877 unlock_page(page);
878 put_page(page);
879 }
880
881 return -ENOMEM;
882 }
883
884 if (!PageUptodate(page))
885 *frame_uptodate = false;
886
887 pages[npages] = page;
888 }
889
890 return 0;
891}
892
e8b8e97f
KA		 893/*
894 * ntfs_compress_write - Helper for ntfs_file_write_iter() (compressed files).
895 */
4342306f
KK		 896static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
897{
898 int err;
899 struct file *file = iocb->ki_filp;
900 size_t count = iov_iter_count(from);
901 loff_t pos = iocb->ki_pos;
902 struct inode *inode = file_inode(file);
903 loff_t i_size = inode->i_size;
904 struct address_space *mapping = inode->i_mapping;
905 struct ntfs_inode *ni = ntfs_i(inode);
906 u64 valid = ni->i_valid;
907 struct ntfs_sb_info *sbi = ni->mi.sbi;
908 struct page *page, **pages = NULL;
909 size_t written = 0;
910 u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits;
911 u32 frame_size = 1u << frame_bits;
912 u32 pages_per_frame = frame_size >> PAGE_SHIFT;
913 u32 ip, off;
914 CLST frame;
915 u64 frame_vbo;
916 pgoff_t index;
917 bool frame_uptodate;
918
919 if (frame_size < PAGE_SIZE) {
920 /*
921 * frame_size == 8K if cluster 512
922 * frame_size == 64K if cluster 4096
923 */
924 ntfs_inode_warn(inode, "page size is bigger than frame size");
925 return -EOPNOTSUPP;
926 }
927
345482bc 928 pages = kmalloc_array(pages_per_frame, sizeof(struct page *), GFP_NOFS);
4342306f
KK		 929 if (!pages)
930 return -ENOMEM;
931
932 current->backing_dev_info = inode_to_bdi(inode);
933 err = file_remove_privs(file);
934 if (err)
935 goto out;
936
937 err = file_update_time(file);
938 if (err)
939 goto out;
940
e8b8e97f 941 /* Zero range [valid : pos). */
4342306f
KK		 942 while (valid < pos) {
943 CLST lcn, clen;
944
945 frame = valid >> frame_bits;
946 frame_vbo = valid & ~(frame_size - 1);
947 off = valid & (frame_size - 1);
948
949 err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 0, &lcn,
950 &clen, NULL);
951 if (err)
952 goto out;
953
954 if (lcn == SPARSE_LCN) {
955 ni->i_valid = valid =
956 frame_vbo + ((u64)clen << sbi->cluster_bits);
957 continue;
958 }
959
e8b8e97f 960 /* Load full frame. */
4342306f
KK		 961 err = ntfs_get_frame_pages(mapping, frame_vbo >> PAGE_SHIFT,
962 pages, pages_per_frame,
963 &frame_uptodate);
964 if (err)
965 goto out;
966
967 if (!frame_uptodate && off) {
968 err = ni_read_frame(ni, frame_vbo, pages,
969 pages_per_frame);
970 if (err) {
971 for (ip = 0; ip < pages_per_frame; ip++) {
972 page = pages[ip];
973 unlock_page(page);
974 put_page(page);
975 }
976 goto out;
977 }
978 }
979
980 ip = off >> PAGE_SHIFT;
981 off = offset_in_page(valid);
982 for (; ip < pages_per_frame; ip++, off = 0) {
983 page = pages[ip];
984 zero_user_segment(page, off, PAGE_SIZE);
985 flush_dcache_page(page);
986 SetPageUptodate(page);
987 }
988
989 ni_lock(ni);
990 err = ni_write_frame(ni, pages, pages_per_frame);
991 ni_unlock(ni);
992
993 for (ip = 0; ip < pages_per_frame; ip++) {
994 page = pages[ip];
995 SetPageUptodate(page);
996 unlock_page(page);
997 put_page(page);
998 }
999
1000 if (err)
1001 goto out;
1002
1003 ni->i_valid = valid = frame_vbo + frame_size;
1004 }
1005
e8b8e97f 1006 /* Copy user data [pos : pos + count). */
4342306f
KK		 1007 while (count) {
1008 size_t copied, bytes;
1009
1010 off = pos & (frame_size - 1);
1011 bytes = frame_size - off;
1012 if (bytes > count)
1013 bytes = count;
1014
4342306f
KK		 1015 frame_vbo = pos & ~(frame_size - 1);
1016 index = frame_vbo >> PAGE_SHIFT;
1017
a6294593 1018 if (unlikely(fault_in_iov_iter_readable(from, bytes))) {
4342306f
KK		 1019 err = -EFAULT;
1020 goto out;
1021 }
1022
e8b8e97f 1023 /* Load full frame. */
4342306f
KK		 1024 err = ntfs_get_frame_pages(mapping, index, pages,
1025 pages_per_frame, &frame_uptodate);
1026 if (err)
1027 goto out;
1028
1029 if (!frame_uptodate) {
1030 loff_t to = pos + bytes;
1031
1032 if (off || (to < i_size && (to & (frame_size - 1)))) {
1033 err = ni_read_frame(ni, frame_vbo, pages,
1034 pages_per_frame);
1035 if (err) {
1036 for (ip = 0; ip < pages_per_frame;
1037 ip++) {
1038 page = pages[ip];
1039 unlock_page(page);
1040 put_page(page);
1041 }
1042 goto out;
1043 }
1044 }
1045 }
1046
1047 WARN_ON(!bytes);
1048 copied = 0;
1049 ip = off >> PAGE_SHIFT;
1050 off = offset_in_page(pos);
1051
e8b8e97f 1052 /* Copy user data to pages. */
4342306f
KK		 1053 for (;;) {
1054 size_t cp, tail = PAGE_SIZE - off;
1055
1056 page = pages[ip];
1057 cp = copy_page_from_iter_atomic(page, off,
1058 min(tail, bytes), from);
1059 flush_dcache_page(page);
1060
1061 copied += cp;
1062 bytes -= cp;
1063 if (!bytes || !cp)
1064 break;
1065
1066 if (cp < tail) {
1067 off += cp;
1068 } else {
1069 ip++;
1070 off = 0;
1071 }
1072 }
1073
1074 ni_lock(ni);
1075 err = ni_write_frame(ni, pages, pages_per_frame);
1076 ni_unlock(ni);
1077
1078 for (ip = 0; ip < pages_per_frame; ip++) {
1079 page = pages[ip];
1080 ClearPageDirty(page);
1081 SetPageUptodate(page);
1082 unlock_page(page);
1083 put_page(page);
1084 }
1085
1086 if (err)
1087 goto out;
1088
1089 /*
1090 * We can loop for a long time in here. Be nice and allow
1091 * us to schedule out to avoid softlocking if preempt
1092 * is disabled.
1093 */
1094 cond_resched();
1095
1096 pos += copied;
1097 written += copied;
1098
1099 count = iov_iter_count(from);
1100 }
1101
1102out:
195c52bd 1103 kfree(pages);
4342306f
KK		 1104
1105 current->backing_dev_info = NULL;
1106
1107 if (err < 0)
1108 return err;
1109
1110 iocb->ki_pos += written;
1111 if (iocb->ki_pos > ni->i_valid)
1112 ni->i_valid = iocb->ki_pos;
1113
1114 return written;
1115}
1116
1117/*
e8b8e97f 1118 * ntfs_file_write_iter - file_operations::write_iter
4342306f
KK		 1119 */
1120static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1121{
1122 struct file *file = iocb->ki_filp;
1123 struct address_space *mapping = file->f_mapping;
1124 struct inode *inode = mapping->host;
1125 ssize_t ret;
1126 struct ntfs_inode *ni = ntfs_i(inode);
1127
1128 if (is_encrypted(ni)) {
1129 ntfs_inode_warn(inode, "encrypted i/o not supported");
1130 return -EOPNOTSUPP;
1131 }
1132
1133 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
1134 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
1135 return -EOPNOTSUPP;
1136 }
1137
1138 if (is_dedup(ni)) {
1139 ntfs_inode_warn(inode, "write into deduplicated not supported");
1140 return -EOPNOTSUPP;
1141 }
1142
1143 if (!inode_trylock(inode)) {
1144 if (iocb->ki_flags & IOCB_NOWAIT)
1145 return -EAGAIN;
1146 inode_lock(inode);
1147 }
1148
1149 ret = generic_write_checks(iocb, from);
1150 if (ret <= 0)
1151 goto out;
1152
1153 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
d3624466 1154 /* Should never be here, see ntfs_file_open(). */
4342306f
KK		 1155 ret = -EOPNOTSUPP;
1156 goto out;
1157 }
1158
1159 ret = ntfs_extend(inode, iocb->ki_pos, ret, file);
1160 if (ret)
1161 goto out;
1162
1163 ret = is_compressed(ni) ? ntfs_compress_write(iocb, from)
1164 : __generic_file_write_iter(iocb, from);
1165
1166out:
1167 inode_unlock(inode);
1168
1169 if (ret > 0)
1170 ret = generic_write_sync(iocb, ret);
1171
1172 return ret;
1173}
1174
1175/*
e8b8e97f 1176 * ntfs_file_open - file_operations::open
4342306f
KK		 1177 */
1178int ntfs_file_open(struct inode *inode, struct file *file)
1179{
1180 struct ntfs_inode *ni = ntfs_i(inode);
1181
1182 if (unlikely((is_compressed(ni) || is_encrypted(ni)) &&
1183 (file->f_flags & O_DIRECT))) {
1184 return -EOPNOTSUPP;
1185 }
1186
e8b8e97f 1187 /* Decompress "external compressed" file if opened for rw. */
4342306f
KK		 1188 if ((ni->ni_flags & NI_FLAG_COMPRESSED_MASK) &&
1189 (file->f_flags & (O_WRONLY | O_RDWR | O_TRUNC))) {
1190#ifdef CONFIG_NTFS3_LZX_XPRESS
1191 int err = ni_decompress_file(ni);
1192
1193 if (err)
1194 return err;
1195#else
1196 ntfs_inode_warn(
1197 inode,
1198 "activate CONFIG_NTFS3_LZX_XPRESS to write external compressed files");
1199 return -EOPNOTSUPP;
1200#endif
1201 }
1202
1203 return generic_file_open(inode, file);
1204}
1205
1206/*
e8b8e97f 1207 * ntfs_file_release - file_operations::release
4342306f
KK		 1208 */
1209static int ntfs_file_release(struct inode *inode, struct file *file)
1210{
1211 struct ntfs_inode *ni = ntfs_i(inode);
1212 struct ntfs_sb_info *sbi = ni->mi.sbi;
1213 int err = 0;
1214
e8b8e97f 1215 /* If we are last writer on the inode, drop the block reservation. */
564c97bd 1216 if (sbi->options->prealloc && ((file->f_mode & FMODE_WRITE) &&
4342306f
KK		 1217 atomic_read(&inode->i_writecount) == 1)) {
1218 ni_lock(ni);
1219 down_write(&ni->file.run_lock);
1220
1221 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
1222 inode->i_size, &ni->i_valid, false, NULL);
1223
1224 up_write(&ni->file.run_lock);
1225 ni_unlock(ni);
1226 }
1227 return err;
1228}
1229
e8b8e97f
KA		 1230/*
1231 * ntfs_fiemap - file_operations::fiemap
1232 */
4342306f
KK		 1233int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1234 __u64 start, __u64 len)
1235{
1236 int err;
1237 struct ntfs_inode *ni = ntfs_i(inode);
1238
d4e8e135
KA		 1239 err = fiemap_prep(inode, fieinfo, start, &len, ~FIEMAP_FLAG_XATTR);
1240 if (err)
1241 return err;
4342306f
KK		 1242
1243 ni_lock(ni);
1244
1245 err = ni_fiemap(ni, fieinfo, start, len);
1246
1247 ni_unlock(ni);
1248
1249 return err;
1250}
1251
1252// clang-format off
1253const struct inode_operations ntfs_file_inode_operations = {
1254 .getattr = ntfs_getattr,
1255 .setattr = ntfs3_setattr,
1256 .listxattr = ntfs_listxattr,
1257 .permission = ntfs_permission,
1258 .get_acl = ntfs_get_acl,
1259 .set_acl = ntfs_set_acl,
1260 .fiemap = ntfs_fiemap,
1261};
1262
1263const struct file_operations ntfs_file_operations = {
1264 .llseek = generic_file_llseek,
1265 .read_iter = ntfs_file_read_iter,
1266 .write_iter = ntfs_file_write_iter,
1267 .unlocked_ioctl = ntfs_ioctl,
1268#ifdef CONFIG_COMPAT
1269 .compat_ioctl = ntfs_compat_ioctl,
1270#endif
1271 .splice_read = generic_file_splice_read,
1272 .mmap = ntfs_file_mmap,
1273 .open = ntfs_file_open,
1274 .fsync = generic_file_fsync,
1275 .splice_write = iter_file_splice_write,
1276 .fallocate = ntfs_fallocate,
1277 .release = ntfs_file_release,
1278};
1279// clang-format on
Linux 6.x block layer and io_uring tree(s)