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Merge tag 'block-6.2-2022-12-29' of git://git.kernel.dk/linux
[mirror_ubuntu-kernels.git] / fs / ntfs3 / inode.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 *
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
5 *
6 */
7
8 #include <linux/buffer_head.h>
9 #include <linux/fs.h>
10 #include <linux/mpage.h>
11 #include <linux/namei.h>
12 #include <linux/nls.h>
13 #include <linux/uio.h>
14 #include <linux/writeback.h>
15
16 #include "debug.h"
17 #include "ntfs.h"
18 #include "ntfs_fs.h"
19
20 /*
21 * ntfs_read_mft - Read record and parses MFT.
22 */
23 static struct inode *ntfs_read_mft(struct inode *inode,
24 const struct cpu_str *name,
25 const struct MFT_REF *ref)
26 {
27 int err = 0;
28 struct ntfs_inode *ni = ntfs_i(inode);
29 struct super_block *sb = inode->i_sb;
30 struct ntfs_sb_info *sbi = sb->s_fs_info;
31 mode_t mode = 0;
32 struct ATTR_STD_INFO5 *std5 = NULL;
33 struct ATTR_LIST_ENTRY *le;
34 struct ATTRIB *attr;
35 bool is_match = false;
36 bool is_root = false;
37 bool is_dir;
38 unsigned long ino = inode->i_ino;
39 u32 rp_fa = 0, asize, t32;
40 u16 roff, rsize, names = 0;
41 const struct ATTR_FILE_NAME *fname = NULL;
42 const struct INDEX_ROOT *root;
43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
44 u64 t64;
45 struct MFT_REC *rec;
46 struct runs_tree *run;
47
48 inode->i_op = NULL;
49 /* Setup 'uid' and 'gid' */
50 inode->i_uid = sbi->options->fs_uid;
51 inode->i_gid = sbi->options->fs_gid;
52
53 err = mi_init(&ni->mi, sbi, ino);
54 if (err)
55 goto out;
56
57 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
58 t64 = sbi->mft.lbo >> sbi->cluster_bits;
59 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
60 sbi->mft.ni = ni;
61 init_rwsem(&ni->file.run_lock);
62
63 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
64 err = -ENOMEM;
65 goto out;
66 }
67 }
68
69 err = mi_read(&ni->mi, ino == MFT_REC_MFT);
70
71 if (err)
72 goto out;
73
74 rec = ni->mi.mrec;
75
76 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
77 ;
78 } else if (ref->seq != rec->seq) {
79 err = -EINVAL;
80 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
81 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
82 goto out;
83 } else if (!is_rec_inuse(rec)) {
84 err = -ESTALE;
85 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
86 goto out;
87 }
88
89 if (le32_to_cpu(rec->total) != sbi->record_size) {
90 /* Bad inode? */
91 err = -EINVAL;
92 goto out;
93 }
94
95 if (!is_rec_base(rec)) {
96 err = -EINVAL;
97 goto out;
98 }
99
100 /* Record should contain $I30 root. */
101 is_dir = rec->flags & RECORD_FLAG_DIR;
102
103 inode->i_generation = le16_to_cpu(rec->seq);
104
105 /* Enumerate all struct Attributes MFT. */
106 le = NULL;
107 attr = NULL;
108
109 /*
110 * To reduce tab pressure use goto instead of
111 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
112 */
113 next_attr:
114 run = NULL;
115 err = -EINVAL;
116 attr = ni_enum_attr_ex(ni, attr, &le, NULL);
117 if (!attr)
118 goto end_enum;
119
120 if (le && le->vcn) {
121 /* This is non primary attribute segment. Ignore if not MFT. */
122 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
123 goto next_attr;
124
125 run = &ni->file.run;
126 asize = le32_to_cpu(attr->size);
127 goto attr_unpack_run;
128 }
129
130 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
131 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
132 asize = le32_to_cpu(attr->size);
133
134 if (le16_to_cpu(attr->name_off) + attr->name_len > asize)
135 goto out;
136
137 if (attr->non_res) {
138 t64 = le64_to_cpu(attr->nres.alloc_size);
139 if (le64_to_cpu(attr->nres.data_size) > t64 ||
140 le64_to_cpu(attr->nres.valid_size) > t64)
141 goto out;
142 }
143
144 switch (attr->type) {
145 case ATTR_STD:
146 if (attr->non_res ||
147 asize < sizeof(struct ATTR_STD_INFO) + roff ||
148 rsize < sizeof(struct ATTR_STD_INFO))
149 goto out;
150
151 if (std5)
152 goto next_attr;
153
154 std5 = Add2Ptr(attr, roff);
155
156 #ifdef STATX_BTIME
157 nt2kernel(std5->cr_time, &ni->i_crtime);
158 #endif
159 nt2kernel(std5->a_time, &inode->i_atime);
160 nt2kernel(std5->c_time, &inode->i_ctime);
161 nt2kernel(std5->m_time, &inode->i_mtime);
162
163 ni->std_fa = std5->fa;
164
165 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
166 rsize >= sizeof(struct ATTR_STD_INFO5))
167 ni->std_security_id = std5->security_id;
168 goto next_attr;
169
170 case ATTR_LIST:
171 if (attr->name_len || le || ino == MFT_REC_LOG)
172 goto out;
173
174 err = ntfs_load_attr_list(ni, attr);
175 if (err)
176 goto out;
177
178 le = NULL;
179 attr = NULL;
180 goto next_attr;
181
182 case ATTR_NAME:
183 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
184 rsize < SIZEOF_ATTRIBUTE_FILENAME)
185 goto out;
186
187 fname = Add2Ptr(attr, roff);
188 if (fname->type == FILE_NAME_DOS)
189 goto next_attr;
190
191 names += 1;
192 if (name && name->len == fname->name_len &&
193 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
194 NULL, false))
195 is_match = true;
196
197 goto next_attr;
198
199 case ATTR_DATA:
200 if (is_dir) {
201 /* Ignore data attribute in dir record. */
202 goto next_attr;
203 }
204
205 if (ino == MFT_REC_BADCLUST && !attr->non_res)
206 goto next_attr;
207
208 if (attr->name_len &&
209 ((ino != MFT_REC_BADCLUST || !attr->non_res ||
210 attr->name_len != ARRAY_SIZE(BAD_NAME) ||
211 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
212 (ino != MFT_REC_SECURE || !attr->non_res ||
213 attr->name_len != ARRAY_SIZE(SDS_NAME) ||
214 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
215 /* File contains stream attribute. Ignore it. */
216 goto next_attr;
217 }
218
219 if (is_attr_sparsed(attr))
220 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
221 else
222 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
223
224 if (is_attr_compressed(attr))
225 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
226 else
227 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
228
229 if (is_attr_encrypted(attr))
230 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
231 else
232 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
233
234 if (!attr->non_res) {
235 ni->i_valid = inode->i_size = rsize;
236 inode_set_bytes(inode, rsize);
237 }
238
239 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
240
241 if (!attr->non_res) {
242 ni->ni_flags |= NI_FLAG_RESIDENT;
243 goto next_attr;
244 }
245
246 inode_set_bytes(inode, attr_ondisk_size(attr));
247
248 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
249 inode->i_size = le64_to_cpu(attr->nres.data_size);
250 if (!attr->nres.alloc_size)
251 goto next_attr;
252
253 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run
254 : &ni->file.run;
255 break;
256
257 case ATTR_ROOT:
258 if (attr->non_res)
259 goto out;
260
261 root = Add2Ptr(attr, roff);
262 is_root = true;
263
264 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
265 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
266 goto next_attr;
267
268 if (root->type != ATTR_NAME ||
269 root->rule != NTFS_COLLATION_TYPE_FILENAME)
270 goto out;
271
272 if (!is_dir)
273 goto next_attr;
274
275 ni->ni_flags |= NI_FLAG_DIR;
276
277 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
278 if (err)
279 goto out;
280
281 mode = sb->s_root
282 ? (S_IFDIR | (0777 & sbi->options->fs_dmask_inv))
283 : (S_IFDIR | 0777);
284 goto next_attr;
285
286 case ATTR_ALLOC:
287 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
288 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
289 goto next_attr;
290
291 inode->i_size = le64_to_cpu(attr->nres.data_size);
292 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
293 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
294
295 run = &ni->dir.alloc_run;
296 break;
297
298 case ATTR_BITMAP:
299 if (ino == MFT_REC_MFT) {
300 if (!attr->non_res)
301 goto out;
302 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
303 /* 0x20000000 = 2^32 / 8 */
304 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
305 goto out;
306 #endif
307 run = &sbi->mft.bitmap.run;
308 break;
309 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
310 !memcmp(attr_name(attr), I30_NAME,
311 sizeof(I30_NAME)) &&
312 attr->non_res) {
313 run = &ni->dir.bitmap_run;
314 break;
315 }
316 goto next_attr;
317
318 case ATTR_REPARSE:
319 if (attr->name_len)
320 goto next_attr;
321
322 rp_fa = ni_parse_reparse(ni, attr, &rp);
323 switch (rp_fa) {
324 case REPARSE_LINK:
325 /*
326 * Normal symlink.
327 * Assume one unicode symbol == one utf8.
328 */
329 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
330 .PrintNameLength) /
331 sizeof(u16);
332
333 ni->i_valid = inode->i_size;
334
335 /* Clear directory bit. */
336 if (ni->ni_flags & NI_FLAG_DIR) {
337 indx_clear(&ni->dir);
338 memset(&ni->dir, 0, sizeof(ni->dir));
339 ni->ni_flags &= ~NI_FLAG_DIR;
340 } else {
341 run_close(&ni->file.run);
342 }
343 mode = S_IFLNK | 0777;
344 is_dir = false;
345 if (attr->non_res) {
346 run = &ni->file.run;
347 goto attr_unpack_run; // Double break.
348 }
349 break;
350
351 case REPARSE_COMPRESSED:
352 break;
353
354 case REPARSE_DEDUPLICATED:
355 break;
356 }
357 goto next_attr;
358
359 case ATTR_EA_INFO:
360 if (!attr->name_len &&
361 resident_data_ex(attr, sizeof(struct EA_INFO))) {
362 ni->ni_flags |= NI_FLAG_EA;
363 /*
364 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
365 */
366 inode->i_mode = mode;
367 ntfs_get_wsl_perm(inode);
368 mode = inode->i_mode;
369 }
370 goto next_attr;
371
372 default:
373 goto next_attr;
374 }
375
376 attr_unpack_run:
377 roff = le16_to_cpu(attr->nres.run_off);
378
379 if (roff > asize) {
380 err = -EINVAL;
381 goto out;
382 }
383
384 t64 = le64_to_cpu(attr->nres.svcn);
385
386 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
387 t64, Add2Ptr(attr, roff), asize - roff);
388 if (err < 0)
389 goto out;
390 err = 0;
391 goto next_attr;
392
393 end_enum:
394
395 if (!std5)
396 goto out;
397
398 if (!is_match && name) {
399 /* Reuse rec as buffer for ascii name. */
400 err = -ENOENT;
401 goto out;
402 }
403
404 if (std5->fa & FILE_ATTRIBUTE_READONLY)
405 mode &= ~0222;
406
407 if (!names) {
408 err = -EINVAL;
409 goto out;
410 }
411
412 if (names != le16_to_cpu(rec->hard_links)) {
413 /* Correct minor error on the fly. Do not mark inode as dirty. */
414 rec->hard_links = cpu_to_le16(names);
415 ni->mi.dirty = true;
416 }
417
418 set_nlink(inode, names);
419
420 if (S_ISDIR(mode)) {
421 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
422
423 /*
424 * Dot and dot-dot should be included in count but was not
425 * included in enumeration.
426 * Usually a hard links to directories are disabled.
427 */
428 inode->i_op = &ntfs_dir_inode_operations;
429 inode->i_fop = &ntfs_dir_operations;
430 ni->i_valid = 0;
431 } else if (S_ISLNK(mode)) {
432 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
433 inode->i_op = &ntfs_link_inode_operations;
434 inode->i_fop = NULL;
435 inode_nohighmem(inode);
436 } else if (S_ISREG(mode)) {
437 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
438 inode->i_op = &ntfs_file_inode_operations;
439 inode->i_fop = &ntfs_file_operations;
440 inode->i_mapping->a_ops =
441 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
442 if (ino != MFT_REC_MFT)
443 init_rwsem(&ni->file.run_lock);
444 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
445 S_ISSOCK(mode)) {
446 inode->i_op = &ntfs_special_inode_operations;
447 init_special_inode(inode, mode, inode->i_rdev);
448 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
449 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
450 /* Records in $Extend are not a files or general directories. */
451 inode->i_op = &ntfs_file_inode_operations;
452 } else {
453 err = -EINVAL;
454 goto out;
455 }
456
457 if ((sbi->options->sys_immutable &&
458 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
459 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
460 inode->i_flags |= S_IMMUTABLE;
461 } else {
462 inode->i_flags &= ~S_IMMUTABLE;
463 }
464
465 inode->i_mode = mode;
466 if (!(ni->ni_flags & NI_FLAG_EA)) {
467 /* If no xattr then no security (stored in xattr). */
468 inode->i_flags |= S_NOSEC;
469 }
470
471 if (ino == MFT_REC_MFT && !sb->s_root)
472 sbi->mft.ni = NULL;
473
474 unlock_new_inode(inode);
475
476 return inode;
477
478 out:
479 if (ino == MFT_REC_MFT && !sb->s_root)
480 sbi->mft.ni = NULL;
481
482 iget_failed(inode);
483 return ERR_PTR(err);
484 }
485
486 /*
487 * ntfs_test_inode
488 *
489 * Return: 1 if match.
490 */
491 static int ntfs_test_inode(struct inode *inode, void *data)
492 {
493 struct MFT_REF *ref = data;
494
495 return ino_get(ref) == inode->i_ino;
496 }
497
498 static int ntfs_set_inode(struct inode *inode, void *data)
499 {
500 const struct MFT_REF *ref = data;
501
502 inode->i_ino = ino_get(ref);
503 return 0;
504 }
505
506 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
507 const struct cpu_str *name)
508 {
509 struct inode *inode;
510
511 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
512 (void *)ref);
513 if (unlikely(!inode))
514 return ERR_PTR(-ENOMEM);
515
516 /* If this is a freshly allocated inode, need to read it now. */
517 if (inode->i_state & I_NEW)
518 inode = ntfs_read_mft(inode, name, ref);
519 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
520 /* Inode overlaps? */
521 _ntfs_bad_inode(inode);
522 }
523
524 if (IS_ERR(inode) && name)
525 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
526
527 return inode;
528 }
529
530 enum get_block_ctx {
531 GET_BLOCK_GENERAL = 0,
532 GET_BLOCK_WRITE_BEGIN = 1,
533 GET_BLOCK_DIRECT_IO_R = 2,
534 GET_BLOCK_DIRECT_IO_W = 3,
535 GET_BLOCK_BMAP = 4,
536 };
537
538 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
539 struct buffer_head *bh, int create,
540 enum get_block_ctx ctx)
541 {
542 struct super_block *sb = inode->i_sb;
543 struct ntfs_sb_info *sbi = sb->s_fs_info;
544 struct ntfs_inode *ni = ntfs_i(inode);
545 struct page *page = bh->b_page;
546 u8 cluster_bits = sbi->cluster_bits;
547 u32 block_size = sb->s_blocksize;
548 u64 bytes, lbo, valid;
549 u32 off;
550 int err;
551 CLST vcn, lcn, len;
552 bool new;
553
554 /* Clear previous state. */
555 clear_buffer_new(bh);
556 clear_buffer_uptodate(bh);
557
558 if (is_resident(ni)) {
559 ni_lock(ni);
560 err = attr_data_read_resident(ni, page);
561 ni_unlock(ni);
562
563 if (!err)
564 set_buffer_uptodate(bh);
565 bh->b_size = block_size;
566 return err;
567 }
568
569 vcn = vbo >> cluster_bits;
570 off = vbo & sbi->cluster_mask;
571 new = false;
572
573 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
574 create && sbi->cluster_size > PAGE_SIZE);
575 if (err)
576 goto out;
577
578 if (!len)
579 return 0;
580
581 bytes = ((u64)len << cluster_bits) - off;
582
583 if (lcn == SPARSE_LCN) {
584 if (!create) {
585 if (bh->b_size > bytes)
586 bh->b_size = bytes;
587 return 0;
588 }
589 WARN_ON(1);
590 }
591
592 if (new)
593 set_buffer_new(bh);
594
595 lbo = ((u64)lcn << cluster_bits) + off;
596
597 set_buffer_mapped(bh);
598 bh->b_bdev = sb->s_bdev;
599 bh->b_blocknr = lbo >> sb->s_blocksize_bits;
600
601 valid = ni->i_valid;
602
603 if (ctx == GET_BLOCK_DIRECT_IO_W) {
604 /* ntfs_direct_IO will update ni->i_valid. */
605 if (vbo >= valid)
606 set_buffer_new(bh);
607 } else if (create) {
608 /* Normal write. */
609 if (bytes > bh->b_size)
610 bytes = bh->b_size;
611
612 if (vbo >= valid)
613 set_buffer_new(bh);
614
615 if (vbo + bytes > valid) {
616 ni->i_valid = vbo + bytes;
617 mark_inode_dirty(inode);
618 }
619 } else if (vbo >= valid) {
620 /* Read out of valid data. */
621 clear_buffer_mapped(bh);
622 } else if (vbo + bytes <= valid) {
623 /* Normal read. */
624 } else if (vbo + block_size <= valid) {
625 /* Normal short read. */
626 bytes = block_size;
627 } else {
628 /*
629 * Read across valid size: vbo < valid && valid < vbo + block_size
630 */
631 bytes = block_size;
632
633 if (page) {
634 u32 voff = valid - vbo;
635
636 bh->b_size = block_size;
637 off = vbo & (PAGE_SIZE - 1);
638 set_bh_page(bh, page, off);
639 err = bh_read(bh, 0);
640 if (err < 0)
641 goto out;
642 zero_user_segment(page, off + voff, off + block_size);
643 }
644 }
645
646 if (bh->b_size > bytes)
647 bh->b_size = bytes;
648
649 #ifndef __LP64__
650 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
651 static_assert(sizeof(size_t) < sizeof(loff_t));
652 if (bytes > 0x40000000u)
653 bh->b_size = 0x40000000u;
654 }
655 #endif
656
657 return 0;
658
659 out:
660 return err;
661 }
662
663 int ntfs_get_block(struct inode *inode, sector_t vbn,
664 struct buffer_head *bh_result, int create)
665 {
666 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
667 bh_result, create, GET_BLOCK_GENERAL);
668 }
669
670 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
671 struct buffer_head *bh_result, int create)
672 {
673 return ntfs_get_block_vbo(inode,
674 (u64)vsn << inode->i_sb->s_blocksize_bits,
675 bh_result, create, GET_BLOCK_BMAP);
676 }
677
678 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
679 {
680 return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
681 }
682
683 static int ntfs_read_folio(struct file *file, struct folio *folio)
684 {
685 struct page *page = &folio->page;
686 int err;
687 struct address_space *mapping = page->mapping;
688 struct inode *inode = mapping->host;
689 struct ntfs_inode *ni = ntfs_i(inode);
690
691 if (is_resident(ni)) {
692 ni_lock(ni);
693 err = attr_data_read_resident(ni, page);
694 ni_unlock(ni);
695 if (err != E_NTFS_NONRESIDENT) {
696 unlock_page(page);
697 return err;
698 }
699 }
700
701 if (is_compressed(ni)) {
702 ni_lock(ni);
703 err = ni_readpage_cmpr(ni, page);
704 ni_unlock(ni);
705 return err;
706 }
707
708 /* Normal + sparse files. */
709 return mpage_read_folio(folio, ntfs_get_block);
710 }
711
712 static void ntfs_readahead(struct readahead_control *rac)
713 {
714 struct address_space *mapping = rac->mapping;
715 struct inode *inode = mapping->host;
716 struct ntfs_inode *ni = ntfs_i(inode);
717 u64 valid;
718 loff_t pos;
719
720 if (is_resident(ni)) {
721 /* No readahead for resident. */
722 return;
723 }
724
725 if (is_compressed(ni)) {
726 /* No readahead for compressed. */
727 return;
728 }
729
730 valid = ni->i_valid;
731 pos = readahead_pos(rac);
732
733 if (valid < i_size_read(inode) && pos <= valid &&
734 valid < pos + readahead_length(rac)) {
735 /* Range cross 'valid'. Read it page by page. */
736 return;
737 }
738
739 mpage_readahead(rac, ntfs_get_block);
740 }
741
742 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
743 struct buffer_head *bh_result, int create)
744 {
745 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
746 bh_result, create, GET_BLOCK_DIRECT_IO_R);
747 }
748
749 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
750 struct buffer_head *bh_result, int create)
751 {
752 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
753 bh_result, create, GET_BLOCK_DIRECT_IO_W);
754 }
755
756 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
757 {
758 struct file *file = iocb->ki_filp;
759 struct address_space *mapping = file->f_mapping;
760 struct inode *inode = mapping->host;
761 struct ntfs_inode *ni = ntfs_i(inode);
762 loff_t vbo = iocb->ki_pos;
763 loff_t end;
764 int wr = iov_iter_rw(iter) & WRITE;
765 size_t iter_count = iov_iter_count(iter);
766 loff_t valid;
767 ssize_t ret;
768
769 if (is_resident(ni)) {
770 /* Switch to buffered write. */
771 ret = 0;
772 goto out;
773 }
774
775 ret = blockdev_direct_IO(iocb, inode, iter,
776 wr ? ntfs_get_block_direct_IO_W
777 : ntfs_get_block_direct_IO_R);
778
779 if (ret > 0)
780 end = vbo + ret;
781 else if (wr && ret == -EIOCBQUEUED)
782 end = vbo + iter_count;
783 else
784 goto out;
785
786 valid = ni->i_valid;
787 if (wr) {
788 if (end > valid && !S_ISBLK(inode->i_mode)) {
789 ni->i_valid = end;
790 mark_inode_dirty(inode);
791 }
792 } else if (vbo < valid && valid < end) {
793 /* Fix page. */
794 iov_iter_revert(iter, end - valid);
795 iov_iter_zero(end - valid, iter);
796 }
797
798 out:
799 return ret;
800 }
801
802 int ntfs_set_size(struct inode *inode, u64 new_size)
803 {
804 struct super_block *sb = inode->i_sb;
805 struct ntfs_sb_info *sbi = sb->s_fs_info;
806 struct ntfs_inode *ni = ntfs_i(inode);
807 int err;
808
809 /* Check for maximum file size. */
810 if (is_sparsed(ni) || is_compressed(ni)) {
811 if (new_size > sbi->maxbytes_sparse) {
812 err = -EFBIG;
813 goto out;
814 }
815 } else if (new_size > sbi->maxbytes) {
816 err = -EFBIG;
817 goto out;
818 }
819
820 ni_lock(ni);
821 down_write(&ni->file.run_lock);
822
823 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
824 &ni->i_valid, true, NULL);
825
826 up_write(&ni->file.run_lock);
827 ni_unlock(ni);
828
829 mark_inode_dirty(inode);
830
831 out:
832 return err;
833 }
834
835 static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
836 {
837 struct address_space *mapping = page->mapping;
838 struct inode *inode = mapping->host;
839 struct ntfs_inode *ni = ntfs_i(inode);
840 int err;
841
842 if (is_resident(ni)) {
843 ni_lock(ni);
844 err = attr_data_write_resident(ni, page);
845 ni_unlock(ni);
846 if (err != E_NTFS_NONRESIDENT) {
847 unlock_page(page);
848 return err;
849 }
850 }
851
852 return block_write_full_page(page, ntfs_get_block, wbc);
853 }
854
855 static int ntfs_writepages(struct address_space *mapping,
856 struct writeback_control *wbc)
857 {
858 /* Redirect call to 'ntfs_writepage' for resident files. */
859 if (is_resident(ntfs_i(mapping->host)))
860 return generic_writepages(mapping, wbc);
861 return mpage_writepages(mapping, wbc, ntfs_get_block);
862 }
863
864 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
865 struct buffer_head *bh_result, int create)
866 {
867 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
868 bh_result, create, GET_BLOCK_WRITE_BEGIN);
869 }
870
871 int ntfs_write_begin(struct file *file, struct address_space *mapping,
872 loff_t pos, u32 len, struct page **pagep, void **fsdata)
873 {
874 int err;
875 struct inode *inode = mapping->host;
876 struct ntfs_inode *ni = ntfs_i(inode);
877
878 *pagep = NULL;
879 if (is_resident(ni)) {
880 struct page *page = grab_cache_page_write_begin(
881 mapping, pos >> PAGE_SHIFT);
882
883 if (!page) {
884 err = -ENOMEM;
885 goto out;
886 }
887
888 ni_lock(ni);
889 err = attr_data_read_resident(ni, page);
890 ni_unlock(ni);
891
892 if (!err) {
893 *pagep = page;
894 goto out;
895 }
896 unlock_page(page);
897 put_page(page);
898
899 if (err != E_NTFS_NONRESIDENT)
900 goto out;
901 }
902
903 err = block_write_begin(mapping, pos, len, pagep,
904 ntfs_get_block_write_begin);
905
906 out:
907 return err;
908 }
909
910 /*
911 * ntfs_write_end - Address_space_operations::write_end.
912 */
913 int ntfs_write_end(struct file *file, struct address_space *mapping,
914 loff_t pos, u32 len, u32 copied, struct page *page,
915 void *fsdata)
916 {
917 struct inode *inode = mapping->host;
918 struct ntfs_inode *ni = ntfs_i(inode);
919 u64 valid = ni->i_valid;
920 bool dirty = false;
921 int err;
922
923 if (is_resident(ni)) {
924 ni_lock(ni);
925 err = attr_data_write_resident(ni, page);
926 ni_unlock(ni);
927 if (!err) {
928 dirty = true;
929 /* Clear any buffers in page. */
930 if (page_has_buffers(page)) {
931 struct buffer_head *head, *bh;
932
933 bh = head = page_buffers(page);
934 do {
935 clear_buffer_dirty(bh);
936 clear_buffer_mapped(bh);
937 set_buffer_uptodate(bh);
938 } while (head != (bh = bh->b_this_page));
939 }
940 SetPageUptodate(page);
941 err = copied;
942 }
943 unlock_page(page);
944 put_page(page);
945 } else {
946 err = generic_write_end(file, mapping, pos, len, copied, page,
947 fsdata);
948 }
949
950 if (err >= 0) {
951 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
952 inode->i_ctime = inode->i_mtime = current_time(inode);
953 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
954 dirty = true;
955 }
956
957 if (valid != ni->i_valid) {
958 /* ni->i_valid is changed in ntfs_get_block_vbo. */
959 dirty = true;
960 }
961
962 if (pos + err > inode->i_size) {
963 inode->i_size = pos + err;
964 dirty = true;
965 }
966
967 if (dirty)
968 mark_inode_dirty(inode);
969 }
970
971 return err;
972 }
973
974 int reset_log_file(struct inode *inode)
975 {
976 int err;
977 loff_t pos = 0;
978 u32 log_size = inode->i_size;
979 struct address_space *mapping = inode->i_mapping;
980
981 for (;;) {
982 u32 len;
983 void *kaddr;
984 struct page *page;
985
986 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
987
988 err = block_write_begin(mapping, pos, len, &page,
989 ntfs_get_block_write_begin);
990 if (err)
991 goto out;
992
993 kaddr = kmap_atomic(page);
994 memset(kaddr, -1, len);
995 kunmap_atomic(kaddr);
996 flush_dcache_page(page);
997
998 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
999 if (err < 0)
1000 goto out;
1001 pos += len;
1002
1003 if (pos >= log_size)
1004 break;
1005 balance_dirty_pages_ratelimited(mapping);
1006 }
1007 out:
1008 mark_inode_dirty_sync(inode);
1009
1010 return err;
1011 }
1012
1013 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1014 {
1015 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1016 }
1017
1018 int ntfs_sync_inode(struct inode *inode)
1019 {
1020 return _ni_write_inode(inode, 1);
1021 }
1022
1023 /*
1024 * writeback_inode - Helper function for ntfs_flush_inodes().
1025 *
1026 * This writes both the inode and the file data blocks, waiting
1027 * for in flight data blocks before the start of the call. It
1028 * does not wait for any io started during the call.
1029 */
1030 static int writeback_inode(struct inode *inode)
1031 {
1032 int ret = sync_inode_metadata(inode, 0);
1033
1034 if (!ret)
1035 ret = filemap_fdatawrite(inode->i_mapping);
1036 return ret;
1037 }
1038
1039 /*
1040 * ntfs_flush_inodes
1041 *
1042 * Write data and metadata corresponding to i1 and i2. The io is
1043 * started but we do not wait for any of it to finish.
1044 *
1045 * filemap_flush() is used for the block device, so if there is a dirty
1046 * page for a block already in flight, we will not wait and start the
1047 * io over again.
1048 */
1049 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1050 struct inode *i2)
1051 {
1052 int ret = 0;
1053
1054 if (i1)
1055 ret = writeback_inode(i1);
1056 if (!ret && i2)
1057 ret = writeback_inode(i2);
1058 if (!ret)
1059 ret = sync_blockdev_nowait(sb->s_bdev);
1060 return ret;
1061 }
1062
1063 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1064 {
1065 pgoff_t idx;
1066
1067 /* Write non resident data. */
1068 for (idx = 0; bytes; idx++) {
1069 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1070 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1071
1072 if (IS_ERR(page))
1073 return PTR_ERR(page);
1074
1075 lock_page(page);
1076 WARN_ON(!PageUptodate(page));
1077 ClearPageUptodate(page);
1078
1079 memcpy(page_address(page), data, op);
1080
1081 flush_dcache_page(page);
1082 SetPageUptodate(page);
1083 unlock_page(page);
1084
1085 ntfs_unmap_page(page);
1086
1087 bytes -= op;
1088 data = Add2Ptr(data, PAGE_SIZE);
1089 }
1090 return 0;
1091 }
1092
1093 /*
1094 * ntfs_reparse_bytes
1095 *
1096 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1097 * for unicode string of @uni_len length.
1098 */
1099 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1100 {
1101 /* Header + unicode string + decorated unicode string. */
1102 return sizeof(short) * (2 * uni_len + 4) +
1103 offsetof(struct REPARSE_DATA_BUFFER,
1104 SymbolicLinkReparseBuffer.PathBuffer);
1105 }
1106
1107 static struct REPARSE_DATA_BUFFER *
1108 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1109 u32 size, u16 *nsize)
1110 {
1111 int i, err;
1112 struct REPARSE_DATA_BUFFER *rp;
1113 __le16 *rp_name;
1114 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1115
1116 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1117 if (!rp)
1118 return ERR_PTR(-ENOMEM);
1119
1120 rs = &rp->SymbolicLinkReparseBuffer;
1121 rp_name = rs->PathBuffer;
1122
1123 /* Convert link name to UTF-16. */
1124 err = ntfs_nls_to_utf16(sbi, symname, size,
1125 (struct cpu_str *)(rp_name - 1), 2 * size,
1126 UTF16_LITTLE_ENDIAN);
1127 if (err < 0)
1128 goto out;
1129
1130 /* err = the length of unicode name of symlink. */
1131 *nsize = ntfs_reparse_bytes(err);
1132
1133 if (*nsize > sbi->reparse.max_size) {
1134 err = -EFBIG;
1135 goto out;
1136 }
1137
1138 /* Translate Linux '/' into Windows '\'. */
1139 for (i = 0; i < err; i++) {
1140 if (rp_name[i] == cpu_to_le16('/'))
1141 rp_name[i] = cpu_to_le16('\\');
1142 }
1143
1144 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1145 rp->ReparseDataLength =
1146 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1147 SymbolicLinkReparseBuffer));
1148
1149 /* PrintName + SubstituteName. */
1150 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1151 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1152 rs->PrintNameLength = rs->SubstituteNameOffset;
1153
1154 /*
1155 * TODO: Use relative path if possible to allow Windows to
1156 * parse this path.
1157 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1158 */
1159 rs->Flags = 0;
1160
1161 memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1162
1163 /* Decorate SubstituteName. */
1164 rp_name += err;
1165 rp_name[0] = cpu_to_le16('\\');
1166 rp_name[1] = cpu_to_le16('?');
1167 rp_name[2] = cpu_to_le16('?');
1168 rp_name[3] = cpu_to_le16('\\');
1169
1170 return rp;
1171 out:
1172 kfree(rp);
1173 return ERR_PTR(err);
1174 }
1175
1176 /*
1177 * ntfs_create_inode
1178 *
1179 * Helper function for:
1180 * - ntfs_create
1181 * - ntfs_mknod
1182 * - ntfs_symlink
1183 * - ntfs_mkdir
1184 * - ntfs_atomic_open
1185 *
1186 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1187 */
1188 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
1189 struct inode *dir, struct dentry *dentry,
1190 const struct cpu_str *uni, umode_t mode,
1191 dev_t dev, const char *symname, u32 size,
1192 struct ntfs_fnd *fnd)
1193 {
1194 int err;
1195 struct super_block *sb = dir->i_sb;
1196 struct ntfs_sb_info *sbi = sb->s_fs_info;
1197 const struct qstr *name = &dentry->d_name;
1198 CLST ino = 0;
1199 struct ntfs_inode *dir_ni = ntfs_i(dir);
1200 struct ntfs_inode *ni = NULL;
1201 struct inode *inode = NULL;
1202 struct ATTRIB *attr;
1203 struct ATTR_STD_INFO5 *std5;
1204 struct ATTR_FILE_NAME *fname;
1205 struct MFT_REC *rec;
1206 u32 asize, dsize, sd_size;
1207 enum FILE_ATTRIBUTE fa;
1208 __le32 security_id = SECURITY_ID_INVALID;
1209 CLST vcn;
1210 const void *sd;
1211 u16 t16, nsize = 0, aid = 0;
1212 struct INDEX_ROOT *root, *dir_root;
1213 struct NTFS_DE *e, *new_de = NULL;
1214 struct REPARSE_DATA_BUFFER *rp = NULL;
1215 bool rp_inserted = false;
1216
1217 if (!fnd)
1218 ni_lock_dir(dir_ni);
1219
1220 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1221 if (!dir_root) {
1222 err = -EINVAL;
1223 goto out1;
1224 }
1225
1226 if (S_ISDIR(mode)) {
1227 /* Use parent's directory attributes. */
1228 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1229 FILE_ATTRIBUTE_ARCHIVE;
1230 /*
1231 * By default child directory inherits parent attributes.
1232 * Root directory is hidden + system.
1233 * Make an exception for children in root.
1234 */
1235 if (dir->i_ino == MFT_REC_ROOT)
1236 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1237 } else if (S_ISLNK(mode)) {
1238 /* It is good idea that link should be the same type (file/dir) as target */
1239 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1240
1241 /*
1242 * Linux: there are dir/file/symlink and so on.
1243 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1244 * It is good idea to create:
1245 * dir + reparse if 'symname' points to directory
1246 * or
1247 * file + reparse if 'symname' points to file
1248 * Unfortunately kern_path hangs if symname contains 'dir'.
1249 */
1250
1251 /*
1252 * struct path path;
1253 *
1254 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1255 * struct inode *target = d_inode(path.dentry);
1256 *
1257 * if (S_ISDIR(target->i_mode))
1258 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1259 * // if ( target->i_sb == sb ){
1260 * // use relative path?
1261 * // }
1262 * path_put(&path);
1263 * }
1264 */
1265 } else if (S_ISREG(mode)) {
1266 if (sbi->options->sparse) {
1267 /* Sparsed regular file, cause option 'sparse'. */
1268 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1269 FILE_ATTRIBUTE_ARCHIVE;
1270 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1271 /* Compressed regular file, if parent is compressed. */
1272 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1273 } else {
1274 /* Regular file, default attributes. */
1275 fa = FILE_ATTRIBUTE_ARCHIVE;
1276 }
1277 } else {
1278 fa = FILE_ATTRIBUTE_ARCHIVE;
1279 }
1280
1281 /* If option "hide_dot_files" then set hidden attribute for dot files. */
1282 if (sbi->options->hide_dot_files && name->name[0] == '.')
1283 fa |= FILE_ATTRIBUTE_HIDDEN;
1284
1285 if (!(mode & 0222))
1286 fa |= FILE_ATTRIBUTE_READONLY;
1287
1288 /* Allocate PATH_MAX bytes. */
1289 new_de = __getname();
1290 if (!new_de) {
1291 err = -ENOMEM;
1292 goto out1;
1293 }
1294
1295 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1296 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1297
1298 /* Step 1: allocate and fill new mft record. */
1299 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1300 if (err)
1301 goto out2;
1302
1303 ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY);
1304 if (IS_ERR(ni)) {
1305 err = PTR_ERR(ni);
1306 ni = NULL;
1307 goto out3;
1308 }
1309 inode = &ni->vfs_inode;
1310 inode_init_owner(mnt_userns, inode, dir, mode);
1311 mode = inode->i_mode;
1312
1313 inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
1314 current_time(inode);
1315
1316 rec = ni->mi.mrec;
1317 rec->hard_links = cpu_to_le16(1);
1318 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1319
1320 /* Get default security id. */
1321 sd = s_default_security;
1322 sd_size = sizeof(s_default_security);
1323
1324 if (is_ntfs3(sbi)) {
1325 security_id = dir_ni->std_security_id;
1326 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1327 security_id = sbi->security.def_security_id;
1328
1329 if (security_id == SECURITY_ID_INVALID &&
1330 !ntfs_insert_security(sbi, sd, sd_size,
1331 &security_id, NULL))
1332 sbi->security.def_security_id = security_id;
1333 }
1334 }
1335
1336 /* Insert standard info. */
1337 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1338
1339 if (security_id == SECURITY_ID_INVALID) {
1340 dsize = sizeof(struct ATTR_STD_INFO);
1341 } else {
1342 dsize = sizeof(struct ATTR_STD_INFO5);
1343 std5->security_id = security_id;
1344 ni->std_security_id = security_id;
1345 }
1346 asize = SIZEOF_RESIDENT + dsize;
1347
1348 attr->type = ATTR_STD;
1349 attr->size = cpu_to_le32(asize);
1350 attr->id = cpu_to_le16(aid++);
1351 attr->res.data_off = SIZEOF_RESIDENT_LE;
1352 attr->res.data_size = cpu_to_le32(dsize);
1353
1354 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1355 kernel2nt(&inode->i_atime);
1356
1357 ni->std_fa = fa;
1358 std5->fa = fa;
1359
1360 attr = Add2Ptr(attr, asize);
1361
1362 /* Insert file name. */
1363 err = fill_name_de(sbi, new_de, name, uni);
1364 if (err)
1365 goto out4;
1366
1367 mi_get_ref(&ni->mi, &new_de->ref);
1368
1369 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1370
1371 if (sbi->options->windows_names &&
1372 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1373 err = -EINVAL;
1374 goto out4;
1375 }
1376
1377 mi_get_ref(&dir_ni->mi, &fname->home);
1378 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1379 fname->dup.a_time = std5->cr_time;
1380 fname->dup.alloc_size = fname->dup.data_size = 0;
1381 fname->dup.fa = std5->fa;
1382 fname->dup.ea_size = fname->dup.reparse = 0;
1383
1384 dsize = le16_to_cpu(new_de->key_size);
1385 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1386
1387 attr->type = ATTR_NAME;
1388 attr->size = cpu_to_le32(asize);
1389 attr->res.data_off = SIZEOF_RESIDENT_LE;
1390 attr->res.flags = RESIDENT_FLAG_INDEXED;
1391 attr->id = cpu_to_le16(aid++);
1392 attr->res.data_size = cpu_to_le32(dsize);
1393 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1394
1395 attr = Add2Ptr(attr, asize);
1396
1397 if (security_id == SECURITY_ID_INVALID) {
1398 /* Insert security attribute. */
1399 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1400
1401 attr->type = ATTR_SECURE;
1402 attr->size = cpu_to_le32(asize);
1403 attr->id = cpu_to_le16(aid++);
1404 attr->res.data_off = SIZEOF_RESIDENT_LE;
1405 attr->res.data_size = cpu_to_le32(sd_size);
1406 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1407
1408 attr = Add2Ptr(attr, asize);
1409 }
1410
1411 attr->id = cpu_to_le16(aid++);
1412 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1413 /*
1414 * Regular directory or symlink to directory.
1415 * Create root attribute.
1416 */
1417 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1418 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1419
1420 attr->type = ATTR_ROOT;
1421 attr->size = cpu_to_le32(asize);
1422
1423 attr->name_len = ARRAY_SIZE(I30_NAME);
1424 attr->name_off = SIZEOF_RESIDENT_LE;
1425 attr->res.data_off =
1426 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1427 attr->res.data_size = cpu_to_le32(dsize);
1428 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1429 sizeof(I30_NAME));
1430
1431 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1432 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1433 root->ihdr.de_off =
1434 cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10
1435 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1436 sizeof(struct NTFS_DE));
1437 root->ihdr.total = root->ihdr.used;
1438
1439 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1440 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1441 e->flags = NTFS_IE_LAST;
1442 } else if (S_ISLNK(mode)) {
1443 /*
1444 * Symlink to file.
1445 * Create empty resident data attribute.
1446 */
1447 asize = SIZEOF_RESIDENT;
1448
1449 /* Insert empty ATTR_DATA */
1450 attr->type = ATTR_DATA;
1451 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1452 attr->name_off = SIZEOF_RESIDENT_LE;
1453 attr->res.data_off = SIZEOF_RESIDENT_LE;
1454 } else if (S_ISREG(mode)) {
1455 /*
1456 * Regular file. Create empty non resident data attribute.
1457 */
1458 attr->type = ATTR_DATA;
1459 attr->non_res = 1;
1460 attr->nres.evcn = cpu_to_le64(-1ll);
1461 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1462 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1463 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1464 attr->flags = ATTR_FLAG_SPARSED;
1465 asize = SIZEOF_NONRESIDENT_EX + 8;
1466 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1467 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1468 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1469 attr->flags = ATTR_FLAG_COMPRESSED;
1470 attr->nres.c_unit = COMPRESSION_UNIT;
1471 asize = SIZEOF_NONRESIDENT_EX + 8;
1472 } else {
1473 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1474 attr->name_off = SIZEOF_NONRESIDENT_LE;
1475 asize = SIZEOF_NONRESIDENT + 8;
1476 }
1477 attr->nres.run_off = attr->name_off;
1478 } else {
1479 /*
1480 * Node. Create empty resident data attribute.
1481 */
1482 attr->type = ATTR_DATA;
1483 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1484 attr->name_off = SIZEOF_RESIDENT_LE;
1485 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1486 attr->flags = ATTR_FLAG_SPARSED;
1487 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1488 attr->flags = ATTR_FLAG_COMPRESSED;
1489 attr->res.data_off = SIZEOF_RESIDENT_LE;
1490 asize = SIZEOF_RESIDENT;
1491 ni->ni_flags |= NI_FLAG_RESIDENT;
1492 }
1493
1494 if (S_ISDIR(mode)) {
1495 ni->ni_flags |= NI_FLAG_DIR;
1496 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1497 if (err)
1498 goto out4;
1499 } else if (S_ISLNK(mode)) {
1500 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1501
1502 if (IS_ERR(rp)) {
1503 err = PTR_ERR(rp);
1504 rp = NULL;
1505 goto out4;
1506 }
1507
1508 /*
1509 * Insert ATTR_REPARSE.
1510 */
1511 attr = Add2Ptr(attr, asize);
1512 attr->type = ATTR_REPARSE;
1513 attr->id = cpu_to_le16(aid++);
1514
1515 /* Resident or non resident? */
1516 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1517 t16 = PtrOffset(rec, attr);
1518
1519 /*
1520 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1521 * It is good idea to keep extened attributes resident.
1522 */
1523 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1524 CLST alen;
1525 CLST clst = bytes_to_cluster(sbi, nsize);
1526
1527 /* Bytes per runs. */
1528 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1529
1530 attr->non_res = 1;
1531 attr->nres.evcn = cpu_to_le64(clst - 1);
1532 attr->name_off = SIZEOF_NONRESIDENT_LE;
1533 attr->nres.run_off = attr->name_off;
1534 attr->nres.data_size = cpu_to_le64(nsize);
1535 attr->nres.valid_size = attr->nres.data_size;
1536 attr->nres.alloc_size =
1537 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1538
1539 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1540 clst, NULL, ALLOCATE_DEF,
1541 &alen, 0, NULL, NULL);
1542 if (err)
1543 goto out5;
1544
1545 err = run_pack(&ni->file.run, 0, clst,
1546 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1547 &vcn);
1548 if (err < 0)
1549 goto out5;
1550
1551 if (vcn != clst) {
1552 err = -EINVAL;
1553 goto out5;
1554 }
1555
1556 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1557 } else {
1558 attr->res.data_off = SIZEOF_RESIDENT_LE;
1559 attr->res.data_size = cpu_to_le32(nsize);
1560 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1561 nsize = 0;
1562 }
1563 /* Size of symlink equals the length of input string. */
1564 inode->i_size = size;
1565
1566 attr->size = cpu_to_le32(asize);
1567
1568 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1569 &new_de->ref);
1570 if (err)
1571 goto out5;
1572
1573 rp_inserted = true;
1574 }
1575
1576 attr = Add2Ptr(attr, asize);
1577 attr->type = ATTR_END;
1578
1579 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1580 rec->next_attr_id = cpu_to_le16(aid);
1581
1582 /* Step 2: Add new name in index. */
1583 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1584 if (err)
1585 goto out6;
1586
1587 /* Unlock parent directory before ntfs_init_acl. */
1588 if (!fnd)
1589 ni_unlock(dir_ni);
1590
1591 inode->i_generation = le16_to_cpu(rec->seq);
1592
1593 dir->i_mtime = dir->i_ctime = inode->i_atime;
1594
1595 if (S_ISDIR(mode)) {
1596 inode->i_op = &ntfs_dir_inode_operations;
1597 inode->i_fop = &ntfs_dir_operations;
1598 } else if (S_ISLNK(mode)) {
1599 inode->i_op = &ntfs_link_inode_operations;
1600 inode->i_fop = NULL;
1601 inode->i_mapping->a_ops = &ntfs_aops;
1602 inode->i_size = size;
1603 inode_nohighmem(inode);
1604 } else if (S_ISREG(mode)) {
1605 inode->i_op = &ntfs_file_inode_operations;
1606 inode->i_fop = &ntfs_file_operations;
1607 inode->i_mapping->a_ops =
1608 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
1609 init_rwsem(&ni->file.run_lock);
1610 } else {
1611 inode->i_op = &ntfs_special_inode_operations;
1612 init_special_inode(inode, mode, dev);
1613 }
1614
1615 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1616 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1617 err = ntfs_init_acl(mnt_userns, inode, dir);
1618 if (err)
1619 goto out7;
1620 } else
1621 #endif
1622 {
1623 inode->i_flags |= S_NOSEC;
1624 }
1625
1626 /* Write non resident data. */
1627 if (nsize) {
1628 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0);
1629 if (err)
1630 goto out7;
1631 }
1632
1633 /*
1634 * Call 'd_instantiate' after inode->i_op is set
1635 * but before finish_open.
1636 */
1637 d_instantiate(dentry, inode);
1638
1639 ntfs_save_wsl_perm(inode);
1640 mark_inode_dirty(dir);
1641 mark_inode_dirty(inode);
1642
1643 /* Normal exit. */
1644 goto out2;
1645
1646 out7:
1647
1648 /* Undo 'indx_insert_entry'. */
1649 if (!fnd)
1650 ni_lock_dir(dir_ni);
1651 indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
1652 le16_to_cpu(new_de->key_size), sbi);
1653 /* ni_unlock(dir_ni); will be called later. */
1654 out6:
1655 if (rp_inserted)
1656 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1657
1658 out5:
1659 if (!S_ISDIR(mode))
1660 run_deallocate(sbi, &ni->file.run, false);
1661
1662 out4:
1663 clear_rec_inuse(rec);
1664 clear_nlink(inode);
1665 ni->mi.dirty = false;
1666 discard_new_inode(inode);
1667 out3:
1668 ntfs_mark_rec_free(sbi, ino, false);
1669
1670 out2:
1671 __putname(new_de);
1672 kfree(rp);
1673
1674 out1:
1675 if (err) {
1676 if (!fnd)
1677 ni_unlock(dir_ni);
1678 return ERR_PTR(err);
1679 }
1680
1681 unlock_new_inode(inode);
1682
1683 return inode;
1684 }
1685
1686 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1687 {
1688 int err;
1689 struct ntfs_inode *ni = ntfs_i(inode);
1690 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1691 struct NTFS_DE *de;
1692
1693 /* Allocate PATH_MAX bytes. */
1694 de = __getname();
1695 if (!de)
1696 return -ENOMEM;
1697
1698 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1699 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1700
1701 /* Construct 'de'. */
1702 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1703 if (err)
1704 goto out;
1705
1706 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1707 out:
1708 __putname(de);
1709 return err;
1710 }
1711
1712 /*
1713 * ntfs_unlink_inode
1714 *
1715 * inode_operations::unlink
1716 * inode_operations::rmdir
1717 */
1718 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1719 {
1720 int err;
1721 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1722 struct inode *inode = d_inode(dentry);
1723 struct ntfs_inode *ni = ntfs_i(inode);
1724 struct ntfs_inode *dir_ni = ntfs_i(dir);
1725 struct NTFS_DE *de, *de2 = NULL;
1726 int undo_remove;
1727
1728 if (ntfs_is_meta_file(sbi, ni->mi.rno))
1729 return -EINVAL;
1730
1731 /* Allocate PATH_MAX bytes. */
1732 de = __getname();
1733 if (!de)
1734 return -ENOMEM;
1735
1736 ni_lock(ni);
1737
1738 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1739 err = -ENOTEMPTY;
1740 goto out;
1741 }
1742
1743 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1744 if (err < 0)
1745 goto out;
1746
1747 undo_remove = 0;
1748 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1749
1750 if (!err) {
1751 drop_nlink(inode);
1752 dir->i_mtime = dir->i_ctime = current_time(dir);
1753 mark_inode_dirty(dir);
1754 inode->i_ctime = dir->i_ctime;
1755 if (inode->i_nlink)
1756 mark_inode_dirty(inode);
1757 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1758 _ntfs_bad_inode(inode);
1759 } else {
1760 if (ni_is_dirty(dir))
1761 mark_inode_dirty(dir);
1762 if (ni_is_dirty(inode))
1763 mark_inode_dirty(inode);
1764 }
1765
1766 out:
1767 ni_unlock(ni);
1768 __putname(de);
1769 return err;
1770 }
1771
1772 void ntfs_evict_inode(struct inode *inode)
1773 {
1774 truncate_inode_pages_final(&inode->i_data);
1775
1776 if (inode->i_nlink)
1777 _ni_write_inode(inode, inode_needs_sync(inode));
1778
1779 invalidate_inode_buffers(inode);
1780 clear_inode(inode);
1781
1782 ni_clear(ntfs_i(inode));
1783 }
1784
1785 /*
1786 * ntfs_translate_junction
1787 *
1788 * Translate a Windows junction target to the Linux equivalent.
1789 * On junctions, targets are always absolute (they include the drive
1790 * letter). We have no way of knowing if the target is for the current
1791 * mounted device or not so we just assume it is.
1792 */
1793 static int ntfs_translate_junction(const struct super_block *sb,
1794 const struct dentry *link_de, char *target,
1795 int target_len, int target_max)
1796 {
1797 int tl_len, err = target_len;
1798 char *link_path_buffer = NULL, *link_path;
1799 char *translated = NULL;
1800 char *target_start;
1801 int copy_len;
1802
1803 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1804 if (!link_path_buffer) {
1805 err = -ENOMEM;
1806 goto out;
1807 }
1808 /* Get link path, relative to mount point */
1809 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1810 if (IS_ERR(link_path)) {
1811 ntfs_err(sb, "Error getting link path");
1812 err = -EINVAL;
1813 goto out;
1814 }
1815
1816 translated = kmalloc(PATH_MAX, GFP_NOFS);
1817 if (!translated) {
1818 err = -ENOMEM;
1819 goto out;
1820 }
1821
1822 /* Make translated path a relative path to mount point */
1823 strcpy(translated, "./");
1824 ++link_path; /* Skip leading / */
1825 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1826 if (*link_path == '/') {
1827 if (PATH_MAX - tl_len < sizeof("../")) {
1828 ntfs_err(sb,
1829 "Link path %s has too many components",
1830 link_path);
1831 err = -EINVAL;
1832 goto out;
1833 }
1834 strcpy(translated + tl_len, "../");
1835 tl_len += sizeof("../") - 1;
1836 }
1837 }
1838
1839 /* Skip drive letter */
1840 target_start = target;
1841 while (*target_start && *target_start != ':')
1842 ++target_start;
1843
1844 if (!*target_start) {
1845 ntfs_err(sb, "Link target (%s) missing drive separator",
1846 target);
1847 err = -EINVAL;
1848 goto out;
1849 }
1850
1851 /* Skip drive separator and leading /, if exists */
1852 target_start += 1 + (target_start[1] == '/');
1853 copy_len = target_len - (target_start - target);
1854
1855 if (PATH_MAX - tl_len <= copy_len) {
1856 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1857 target_start, PATH_MAX - tl_len, copy_len);
1858 err = -EINVAL;
1859 goto out;
1860 }
1861
1862 /* translated path has a trailing / and target_start does not */
1863 strcpy(translated + tl_len, target_start);
1864 tl_len += copy_len;
1865 if (target_max <= tl_len) {
1866 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1867 translated, target_max, tl_len);
1868 err = -EINVAL;
1869 goto out;
1870 }
1871 strcpy(target, translated);
1872 err = tl_len;
1873
1874 out:
1875 kfree(link_path_buffer);
1876 kfree(translated);
1877 return err;
1878 }
1879
1880 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1881 struct inode *inode, char *buffer,
1882 int buflen)
1883 {
1884 int i, err = -EINVAL;
1885 struct ntfs_inode *ni = ntfs_i(inode);
1886 struct super_block *sb = inode->i_sb;
1887 struct ntfs_sb_info *sbi = sb->s_fs_info;
1888 u64 size;
1889 u16 ulen = 0;
1890 void *to_free = NULL;
1891 struct REPARSE_DATA_BUFFER *rp;
1892 const __le16 *uname;
1893 struct ATTRIB *attr;
1894
1895 /* Reparse data present. Try to parse it. */
1896 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1897 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1898
1899 *buffer = 0;
1900
1901 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1902 if (!attr)
1903 goto out;
1904
1905 if (!attr->non_res) {
1906 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1907 if (!rp)
1908 goto out;
1909 size = le32_to_cpu(attr->res.data_size);
1910 } else {
1911 size = le64_to_cpu(attr->nres.data_size);
1912 rp = NULL;
1913 }
1914
1915 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1916 goto out;
1917
1918 if (!rp) {
1919 rp = kmalloc(size, GFP_NOFS);
1920 if (!rp) {
1921 err = -ENOMEM;
1922 goto out;
1923 }
1924 to_free = rp;
1925 /* Read into temporal buffer. */
1926 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1927 if (err)
1928 goto out;
1929 }
1930
1931 /* Microsoft Tag. */
1932 switch (rp->ReparseTag) {
1933 case IO_REPARSE_TAG_MOUNT_POINT:
1934 /* Mount points and junctions. */
1935 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1936 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1937 MountPointReparseBuffer.PathBuffer))
1938 goto out;
1939 uname = Add2Ptr(rp,
1940 offsetof(struct REPARSE_DATA_BUFFER,
1941 MountPointReparseBuffer.PathBuffer) +
1942 le16_to_cpu(rp->MountPointReparseBuffer
1943 .PrintNameOffset));
1944 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1945 break;
1946
1947 case IO_REPARSE_TAG_SYMLINK:
1948 /* FolderSymbolicLink */
1949 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1950 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1951 SymbolicLinkReparseBuffer.PathBuffer))
1952 goto out;
1953 uname = Add2Ptr(
1954 rp, offsetof(struct REPARSE_DATA_BUFFER,
1955 SymbolicLinkReparseBuffer.PathBuffer) +
1956 le16_to_cpu(rp->SymbolicLinkReparseBuffer
1957 .PrintNameOffset));
1958 ulen = le16_to_cpu(
1959 rp->SymbolicLinkReparseBuffer.PrintNameLength);
1960 break;
1961
1962 case IO_REPARSE_TAG_CLOUD:
1963 case IO_REPARSE_TAG_CLOUD_1:
1964 case IO_REPARSE_TAG_CLOUD_2:
1965 case IO_REPARSE_TAG_CLOUD_3:
1966 case IO_REPARSE_TAG_CLOUD_4:
1967 case IO_REPARSE_TAG_CLOUD_5:
1968 case IO_REPARSE_TAG_CLOUD_6:
1969 case IO_REPARSE_TAG_CLOUD_7:
1970 case IO_REPARSE_TAG_CLOUD_8:
1971 case IO_REPARSE_TAG_CLOUD_9:
1972 case IO_REPARSE_TAG_CLOUD_A:
1973 case IO_REPARSE_TAG_CLOUD_B:
1974 case IO_REPARSE_TAG_CLOUD_C:
1975 case IO_REPARSE_TAG_CLOUD_D:
1976 case IO_REPARSE_TAG_CLOUD_E:
1977 case IO_REPARSE_TAG_CLOUD_F:
1978 err = sizeof("OneDrive") - 1;
1979 if (err > buflen)
1980 err = buflen;
1981 memcpy(buffer, "OneDrive", err);
1982 goto out;
1983
1984 default:
1985 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
1986 /* Unknown Microsoft Tag. */
1987 goto out;
1988 }
1989 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
1990 size <= sizeof(struct REPARSE_POINT)) {
1991 goto out;
1992 }
1993
1994 /* Users tag. */
1995 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
1996 ulen = le16_to_cpu(rp->ReparseDataLength) -
1997 sizeof(struct REPARSE_POINT);
1998 }
1999
2000 /* Convert nlen from bytes to UNICODE chars. */
2001 ulen >>= 1;
2002
2003 /* Check that name is available. */
2004 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2005 goto out;
2006
2007 /* If name is already zero terminated then truncate it now. */
2008 if (!uname[ulen - 1])
2009 ulen -= 1;
2010
2011 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2012
2013 if (err < 0)
2014 goto out;
2015
2016 /* Translate Windows '\' into Linux '/'. */
2017 for (i = 0; i < err; i++) {
2018 if (buffer[i] == '\\')
2019 buffer[i] = '/';
2020 }
2021
2022 /* Always set last zero. */
2023 buffer[err] = 0;
2024
2025 /* If this is a junction, translate the link target. */
2026 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2027 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2028
2029 out:
2030 kfree(to_free);
2031 return err;
2032 }
2033
2034 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2035 struct delayed_call *done)
2036 {
2037 int err;
2038 char *ret;
2039
2040 if (!de)
2041 return ERR_PTR(-ECHILD);
2042
2043 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2044 if (!ret)
2045 return ERR_PTR(-ENOMEM);
2046
2047 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2048 if (err < 0) {
2049 kfree(ret);
2050 return ERR_PTR(err);
2051 }
2052
2053 set_delayed_call(done, kfree_link, ret);
2054
2055 return ret;
2056 }
2057
2058 // clang-format off
2059 const struct inode_operations ntfs_link_inode_operations = {
2060 .get_link = ntfs_get_link,
2061 .setattr = ntfs3_setattr,
2062 .listxattr = ntfs_listxattr,
2063 .permission = ntfs_permission,
2064 };
2065
2066 const struct address_space_operations ntfs_aops = {
2067 .read_folio = ntfs_read_folio,
2068 .readahead = ntfs_readahead,
2069 .writepage = ntfs_writepage,
2070 .writepages = ntfs_writepages,
2071 .write_begin = ntfs_write_begin,
2072 .write_end = ntfs_write_end,
2073 .direct_IO = ntfs_direct_IO,
2074 .bmap = ntfs_bmap,
2075 .dirty_folio = block_dirty_folio,
2076 .invalidate_folio = block_invalidate_folio,
2077 };
2078
2079 const struct address_space_operations ntfs_aops_cmpr = {
2080 .read_folio = ntfs_read_folio,
2081 .readahead = ntfs_readahead,
2082 };
2083 // clang-format on
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