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ntfs3: stop using generic_writepages
[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_resident_writepage(struct page *page,
856 struct writeback_control *wbc, void *data)
857 {
858 struct address_space *mapping = data;
859 struct ntfs_inode *ni = ntfs_i(mapping->host);
860 int ret;
861
862 ni_lock(ni);
863 ret = attr_data_write_resident(ni, page);
864 ni_unlock(ni);
865
866 if (ret != E_NTFS_NONRESIDENT)
867 unlock_page(page);
868 mapping_set_error(mapping, ret);
869 return ret;
870 }
871
872 static int ntfs_writepages(struct address_space *mapping,
873 struct writeback_control *wbc)
874 {
875 if (is_resident(ntfs_i(mapping->host)))
876 return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
877 mapping);
878 return mpage_writepages(mapping, wbc, ntfs_get_block);
879 }
880
881 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
882 struct buffer_head *bh_result, int create)
883 {
884 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
885 bh_result, create, GET_BLOCK_WRITE_BEGIN);
886 }
887
888 int ntfs_write_begin(struct file *file, struct address_space *mapping,
889 loff_t pos, u32 len, struct page **pagep, void **fsdata)
890 {
891 int err;
892 struct inode *inode = mapping->host;
893 struct ntfs_inode *ni = ntfs_i(inode);
894
895 *pagep = NULL;
896 if (is_resident(ni)) {
897 struct page *page = grab_cache_page_write_begin(
898 mapping, pos >> PAGE_SHIFT);
899
900 if (!page) {
901 err = -ENOMEM;
902 goto out;
903 }
904
905 ni_lock(ni);
906 err = attr_data_read_resident(ni, page);
907 ni_unlock(ni);
908
909 if (!err) {
910 *pagep = page;
911 goto out;
912 }
913 unlock_page(page);
914 put_page(page);
915
916 if (err != E_NTFS_NONRESIDENT)
917 goto out;
918 }
919
920 err = block_write_begin(mapping, pos, len, pagep,
921 ntfs_get_block_write_begin);
922
923 out:
924 return err;
925 }
926
927 /*
928 * ntfs_write_end - Address_space_operations::write_end.
929 */
930 int ntfs_write_end(struct file *file, struct address_space *mapping,
931 loff_t pos, u32 len, u32 copied, struct page *page,
932 void *fsdata)
933 {
934 struct inode *inode = mapping->host;
935 struct ntfs_inode *ni = ntfs_i(inode);
936 u64 valid = ni->i_valid;
937 bool dirty = false;
938 int err;
939
940 if (is_resident(ni)) {
941 ni_lock(ni);
942 err = attr_data_write_resident(ni, page);
943 ni_unlock(ni);
944 if (!err) {
945 dirty = true;
946 /* Clear any buffers in page. */
947 if (page_has_buffers(page)) {
948 struct buffer_head *head, *bh;
949
950 bh = head = page_buffers(page);
951 do {
952 clear_buffer_dirty(bh);
953 clear_buffer_mapped(bh);
954 set_buffer_uptodate(bh);
955 } while (head != (bh = bh->b_this_page));
956 }
957 SetPageUptodate(page);
958 err = copied;
959 }
960 unlock_page(page);
961 put_page(page);
962 } else {
963 err = generic_write_end(file, mapping, pos, len, copied, page,
964 fsdata);
965 }
966
967 if (err >= 0) {
968 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
969 inode->i_ctime = inode->i_mtime = current_time(inode);
970 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
971 dirty = true;
972 }
973
974 if (valid != ni->i_valid) {
975 /* ni->i_valid is changed in ntfs_get_block_vbo. */
976 dirty = true;
977 }
978
979 if (pos + err > inode->i_size) {
980 inode->i_size = pos + err;
981 dirty = true;
982 }
983
984 if (dirty)
985 mark_inode_dirty(inode);
986 }
987
988 return err;
989 }
990
991 int reset_log_file(struct inode *inode)
992 {
993 int err;
994 loff_t pos = 0;
995 u32 log_size = inode->i_size;
996 struct address_space *mapping = inode->i_mapping;
997
998 for (;;) {
999 u32 len;
1000 void *kaddr;
1001 struct page *page;
1002
1003 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
1004
1005 err = block_write_begin(mapping, pos, len, &page,
1006 ntfs_get_block_write_begin);
1007 if (err)
1008 goto out;
1009
1010 kaddr = kmap_atomic(page);
1011 memset(kaddr, -1, len);
1012 kunmap_atomic(kaddr);
1013 flush_dcache_page(page);
1014
1015 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
1016 if (err < 0)
1017 goto out;
1018 pos += len;
1019
1020 if (pos >= log_size)
1021 break;
1022 balance_dirty_pages_ratelimited(mapping);
1023 }
1024 out:
1025 mark_inode_dirty_sync(inode);
1026
1027 return err;
1028 }
1029
1030 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1031 {
1032 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1033 }
1034
1035 int ntfs_sync_inode(struct inode *inode)
1036 {
1037 return _ni_write_inode(inode, 1);
1038 }
1039
1040 /*
1041 * writeback_inode - Helper function for ntfs_flush_inodes().
1042 *
1043 * This writes both the inode and the file data blocks, waiting
1044 * for in flight data blocks before the start of the call. It
1045 * does not wait for any io started during the call.
1046 */
1047 static int writeback_inode(struct inode *inode)
1048 {
1049 int ret = sync_inode_metadata(inode, 0);
1050
1051 if (!ret)
1052 ret = filemap_fdatawrite(inode->i_mapping);
1053 return ret;
1054 }
1055
1056 /*
1057 * ntfs_flush_inodes
1058 *
1059 * Write data and metadata corresponding to i1 and i2. The io is
1060 * started but we do not wait for any of it to finish.
1061 *
1062 * filemap_flush() is used for the block device, so if there is a dirty
1063 * page for a block already in flight, we will not wait and start the
1064 * io over again.
1065 */
1066 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1067 struct inode *i2)
1068 {
1069 int ret = 0;
1070
1071 if (i1)
1072 ret = writeback_inode(i1);
1073 if (!ret && i2)
1074 ret = writeback_inode(i2);
1075 if (!ret)
1076 ret = sync_blockdev_nowait(sb->s_bdev);
1077 return ret;
1078 }
1079
1080 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1081 {
1082 pgoff_t idx;
1083
1084 /* Write non resident data. */
1085 for (idx = 0; bytes; idx++) {
1086 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1087 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1088
1089 if (IS_ERR(page))
1090 return PTR_ERR(page);
1091
1092 lock_page(page);
1093 WARN_ON(!PageUptodate(page));
1094 ClearPageUptodate(page);
1095
1096 memcpy(page_address(page), data, op);
1097
1098 flush_dcache_page(page);
1099 SetPageUptodate(page);
1100 unlock_page(page);
1101
1102 ntfs_unmap_page(page);
1103
1104 bytes -= op;
1105 data = Add2Ptr(data, PAGE_SIZE);
1106 }
1107 return 0;
1108 }
1109
1110 /*
1111 * ntfs_reparse_bytes
1112 *
1113 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1114 * for unicode string of @uni_len length.
1115 */
1116 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1117 {
1118 /* Header + unicode string + decorated unicode string. */
1119 return sizeof(short) * (2 * uni_len + 4) +
1120 offsetof(struct REPARSE_DATA_BUFFER,
1121 SymbolicLinkReparseBuffer.PathBuffer);
1122 }
1123
1124 static struct REPARSE_DATA_BUFFER *
1125 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1126 u32 size, u16 *nsize)
1127 {
1128 int i, err;
1129 struct REPARSE_DATA_BUFFER *rp;
1130 __le16 *rp_name;
1131 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1132
1133 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1134 if (!rp)
1135 return ERR_PTR(-ENOMEM);
1136
1137 rs = &rp->SymbolicLinkReparseBuffer;
1138 rp_name = rs->PathBuffer;
1139
1140 /* Convert link name to UTF-16. */
1141 err = ntfs_nls_to_utf16(sbi, symname, size,
1142 (struct cpu_str *)(rp_name - 1), 2 * size,
1143 UTF16_LITTLE_ENDIAN);
1144 if (err < 0)
1145 goto out;
1146
1147 /* err = the length of unicode name of symlink. */
1148 *nsize = ntfs_reparse_bytes(err);
1149
1150 if (*nsize > sbi->reparse.max_size) {
1151 err = -EFBIG;
1152 goto out;
1153 }
1154
1155 /* Translate Linux '/' into Windows '\'. */
1156 for (i = 0; i < err; i++) {
1157 if (rp_name[i] == cpu_to_le16('/'))
1158 rp_name[i] = cpu_to_le16('\\');
1159 }
1160
1161 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1162 rp->ReparseDataLength =
1163 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1164 SymbolicLinkReparseBuffer));
1165
1166 /* PrintName + SubstituteName. */
1167 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1168 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1169 rs->PrintNameLength = rs->SubstituteNameOffset;
1170
1171 /*
1172 * TODO: Use relative path if possible to allow Windows to
1173 * parse this path.
1174 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1175 */
1176 rs->Flags = 0;
1177
1178 memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1179
1180 /* Decorate SubstituteName. */
1181 rp_name += err;
1182 rp_name[0] = cpu_to_le16('\\');
1183 rp_name[1] = cpu_to_le16('?');
1184 rp_name[2] = cpu_to_le16('?');
1185 rp_name[3] = cpu_to_le16('\\');
1186
1187 return rp;
1188 out:
1189 kfree(rp);
1190 return ERR_PTR(err);
1191 }
1192
1193 /*
1194 * ntfs_create_inode
1195 *
1196 * Helper function for:
1197 * - ntfs_create
1198 * - ntfs_mknod
1199 * - ntfs_symlink
1200 * - ntfs_mkdir
1201 * - ntfs_atomic_open
1202 *
1203 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1204 */
1205 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
1206 struct inode *dir, struct dentry *dentry,
1207 const struct cpu_str *uni, umode_t mode,
1208 dev_t dev, const char *symname, u32 size,
1209 struct ntfs_fnd *fnd)
1210 {
1211 int err;
1212 struct super_block *sb = dir->i_sb;
1213 struct ntfs_sb_info *sbi = sb->s_fs_info;
1214 const struct qstr *name = &dentry->d_name;
1215 CLST ino = 0;
1216 struct ntfs_inode *dir_ni = ntfs_i(dir);
1217 struct ntfs_inode *ni = NULL;
1218 struct inode *inode = NULL;
1219 struct ATTRIB *attr;
1220 struct ATTR_STD_INFO5 *std5;
1221 struct ATTR_FILE_NAME *fname;
1222 struct MFT_REC *rec;
1223 u32 asize, dsize, sd_size;
1224 enum FILE_ATTRIBUTE fa;
1225 __le32 security_id = SECURITY_ID_INVALID;
1226 CLST vcn;
1227 const void *sd;
1228 u16 t16, nsize = 0, aid = 0;
1229 struct INDEX_ROOT *root, *dir_root;
1230 struct NTFS_DE *e, *new_de = NULL;
1231 struct REPARSE_DATA_BUFFER *rp = NULL;
1232 bool rp_inserted = false;
1233
1234 if (!fnd)
1235 ni_lock_dir(dir_ni);
1236
1237 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1238 if (!dir_root) {
1239 err = -EINVAL;
1240 goto out1;
1241 }
1242
1243 if (S_ISDIR(mode)) {
1244 /* Use parent's directory attributes. */
1245 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1246 FILE_ATTRIBUTE_ARCHIVE;
1247 /*
1248 * By default child directory inherits parent attributes.
1249 * Root directory is hidden + system.
1250 * Make an exception for children in root.
1251 */
1252 if (dir->i_ino == MFT_REC_ROOT)
1253 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1254 } else if (S_ISLNK(mode)) {
1255 /* It is good idea that link should be the same type (file/dir) as target */
1256 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1257
1258 /*
1259 * Linux: there are dir/file/symlink and so on.
1260 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1261 * It is good idea to create:
1262 * dir + reparse if 'symname' points to directory
1263 * or
1264 * file + reparse if 'symname' points to file
1265 * Unfortunately kern_path hangs if symname contains 'dir'.
1266 */
1267
1268 /*
1269 * struct path path;
1270 *
1271 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1272 * struct inode *target = d_inode(path.dentry);
1273 *
1274 * if (S_ISDIR(target->i_mode))
1275 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1276 * // if ( target->i_sb == sb ){
1277 * // use relative path?
1278 * // }
1279 * path_put(&path);
1280 * }
1281 */
1282 } else if (S_ISREG(mode)) {
1283 if (sbi->options->sparse) {
1284 /* Sparsed regular file, cause option 'sparse'. */
1285 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1286 FILE_ATTRIBUTE_ARCHIVE;
1287 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1288 /* Compressed regular file, if parent is compressed. */
1289 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1290 } else {
1291 /* Regular file, default attributes. */
1292 fa = FILE_ATTRIBUTE_ARCHIVE;
1293 }
1294 } else {
1295 fa = FILE_ATTRIBUTE_ARCHIVE;
1296 }
1297
1298 /* If option "hide_dot_files" then set hidden attribute for dot files. */
1299 if (sbi->options->hide_dot_files && name->name[0] == '.')
1300 fa |= FILE_ATTRIBUTE_HIDDEN;
1301
1302 if (!(mode & 0222))
1303 fa |= FILE_ATTRIBUTE_READONLY;
1304
1305 /* Allocate PATH_MAX bytes. */
1306 new_de = __getname();
1307 if (!new_de) {
1308 err = -ENOMEM;
1309 goto out1;
1310 }
1311
1312 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1313 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1314
1315 /* Step 1: allocate and fill new mft record. */
1316 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1317 if (err)
1318 goto out2;
1319
1320 ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY);
1321 if (IS_ERR(ni)) {
1322 err = PTR_ERR(ni);
1323 ni = NULL;
1324 goto out3;
1325 }
1326 inode = &ni->vfs_inode;
1327 inode_init_owner(mnt_userns, inode, dir, mode);
1328 mode = inode->i_mode;
1329
1330 inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
1331 current_time(inode);
1332
1333 rec = ni->mi.mrec;
1334 rec->hard_links = cpu_to_le16(1);
1335 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1336
1337 /* Get default security id. */
1338 sd = s_default_security;
1339 sd_size = sizeof(s_default_security);
1340
1341 if (is_ntfs3(sbi)) {
1342 security_id = dir_ni->std_security_id;
1343 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1344 security_id = sbi->security.def_security_id;
1345
1346 if (security_id == SECURITY_ID_INVALID &&
1347 !ntfs_insert_security(sbi, sd, sd_size,
1348 &security_id, NULL))
1349 sbi->security.def_security_id = security_id;
1350 }
1351 }
1352
1353 /* Insert standard info. */
1354 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1355
1356 if (security_id == SECURITY_ID_INVALID) {
1357 dsize = sizeof(struct ATTR_STD_INFO);
1358 } else {
1359 dsize = sizeof(struct ATTR_STD_INFO5);
1360 std5->security_id = security_id;
1361 ni->std_security_id = security_id;
1362 }
1363 asize = SIZEOF_RESIDENT + dsize;
1364
1365 attr->type = ATTR_STD;
1366 attr->size = cpu_to_le32(asize);
1367 attr->id = cpu_to_le16(aid++);
1368 attr->res.data_off = SIZEOF_RESIDENT_LE;
1369 attr->res.data_size = cpu_to_le32(dsize);
1370
1371 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1372 kernel2nt(&inode->i_atime);
1373
1374 ni->std_fa = fa;
1375 std5->fa = fa;
1376
1377 attr = Add2Ptr(attr, asize);
1378
1379 /* Insert file name. */
1380 err = fill_name_de(sbi, new_de, name, uni);
1381 if (err)
1382 goto out4;
1383
1384 mi_get_ref(&ni->mi, &new_de->ref);
1385
1386 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1387
1388 if (sbi->options->windows_names &&
1389 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1390 err = -EINVAL;
1391 goto out4;
1392 }
1393
1394 mi_get_ref(&dir_ni->mi, &fname->home);
1395 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1396 fname->dup.a_time = std5->cr_time;
1397 fname->dup.alloc_size = fname->dup.data_size = 0;
1398 fname->dup.fa = std5->fa;
1399 fname->dup.ea_size = fname->dup.reparse = 0;
1400
1401 dsize = le16_to_cpu(new_de->key_size);
1402 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1403
1404 attr->type = ATTR_NAME;
1405 attr->size = cpu_to_le32(asize);
1406 attr->res.data_off = SIZEOF_RESIDENT_LE;
1407 attr->res.flags = RESIDENT_FLAG_INDEXED;
1408 attr->id = cpu_to_le16(aid++);
1409 attr->res.data_size = cpu_to_le32(dsize);
1410 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1411
1412 attr = Add2Ptr(attr, asize);
1413
1414 if (security_id == SECURITY_ID_INVALID) {
1415 /* Insert security attribute. */
1416 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1417
1418 attr->type = ATTR_SECURE;
1419 attr->size = cpu_to_le32(asize);
1420 attr->id = cpu_to_le16(aid++);
1421 attr->res.data_off = SIZEOF_RESIDENT_LE;
1422 attr->res.data_size = cpu_to_le32(sd_size);
1423 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1424
1425 attr = Add2Ptr(attr, asize);
1426 }
1427
1428 attr->id = cpu_to_le16(aid++);
1429 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1430 /*
1431 * Regular directory or symlink to directory.
1432 * Create root attribute.
1433 */
1434 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1435 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1436
1437 attr->type = ATTR_ROOT;
1438 attr->size = cpu_to_le32(asize);
1439
1440 attr->name_len = ARRAY_SIZE(I30_NAME);
1441 attr->name_off = SIZEOF_RESIDENT_LE;
1442 attr->res.data_off =
1443 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1444 attr->res.data_size = cpu_to_le32(dsize);
1445 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1446 sizeof(I30_NAME));
1447
1448 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1449 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1450 root->ihdr.de_off =
1451 cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10
1452 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1453 sizeof(struct NTFS_DE));
1454 root->ihdr.total = root->ihdr.used;
1455
1456 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1457 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1458 e->flags = NTFS_IE_LAST;
1459 } else if (S_ISLNK(mode)) {
1460 /*
1461 * Symlink to file.
1462 * Create empty resident data attribute.
1463 */
1464 asize = SIZEOF_RESIDENT;
1465
1466 /* Insert empty ATTR_DATA */
1467 attr->type = ATTR_DATA;
1468 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1469 attr->name_off = SIZEOF_RESIDENT_LE;
1470 attr->res.data_off = SIZEOF_RESIDENT_LE;
1471 } else if (S_ISREG(mode)) {
1472 /*
1473 * Regular file. Create empty non resident data attribute.
1474 */
1475 attr->type = ATTR_DATA;
1476 attr->non_res = 1;
1477 attr->nres.evcn = cpu_to_le64(-1ll);
1478 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1479 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1480 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1481 attr->flags = ATTR_FLAG_SPARSED;
1482 asize = SIZEOF_NONRESIDENT_EX + 8;
1483 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1484 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1485 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1486 attr->flags = ATTR_FLAG_COMPRESSED;
1487 attr->nres.c_unit = COMPRESSION_UNIT;
1488 asize = SIZEOF_NONRESIDENT_EX + 8;
1489 } else {
1490 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1491 attr->name_off = SIZEOF_NONRESIDENT_LE;
1492 asize = SIZEOF_NONRESIDENT + 8;
1493 }
1494 attr->nres.run_off = attr->name_off;
1495 } else {
1496 /*
1497 * Node. Create empty resident data attribute.
1498 */
1499 attr->type = ATTR_DATA;
1500 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1501 attr->name_off = SIZEOF_RESIDENT_LE;
1502 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1503 attr->flags = ATTR_FLAG_SPARSED;
1504 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1505 attr->flags = ATTR_FLAG_COMPRESSED;
1506 attr->res.data_off = SIZEOF_RESIDENT_LE;
1507 asize = SIZEOF_RESIDENT;
1508 ni->ni_flags |= NI_FLAG_RESIDENT;
1509 }
1510
1511 if (S_ISDIR(mode)) {
1512 ni->ni_flags |= NI_FLAG_DIR;
1513 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1514 if (err)
1515 goto out4;
1516 } else if (S_ISLNK(mode)) {
1517 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1518
1519 if (IS_ERR(rp)) {
1520 err = PTR_ERR(rp);
1521 rp = NULL;
1522 goto out4;
1523 }
1524
1525 /*
1526 * Insert ATTR_REPARSE.
1527 */
1528 attr = Add2Ptr(attr, asize);
1529 attr->type = ATTR_REPARSE;
1530 attr->id = cpu_to_le16(aid++);
1531
1532 /* Resident or non resident? */
1533 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1534 t16 = PtrOffset(rec, attr);
1535
1536 /*
1537 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1538 * It is good idea to keep extened attributes resident.
1539 */
1540 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1541 CLST alen;
1542 CLST clst = bytes_to_cluster(sbi, nsize);
1543
1544 /* Bytes per runs. */
1545 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1546
1547 attr->non_res = 1;
1548 attr->nres.evcn = cpu_to_le64(clst - 1);
1549 attr->name_off = SIZEOF_NONRESIDENT_LE;
1550 attr->nres.run_off = attr->name_off;
1551 attr->nres.data_size = cpu_to_le64(nsize);
1552 attr->nres.valid_size = attr->nres.data_size;
1553 attr->nres.alloc_size =
1554 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1555
1556 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1557 clst, NULL, ALLOCATE_DEF,
1558 &alen, 0, NULL, NULL);
1559 if (err)
1560 goto out5;
1561
1562 err = run_pack(&ni->file.run, 0, clst,
1563 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1564 &vcn);
1565 if (err < 0)
1566 goto out5;
1567
1568 if (vcn != clst) {
1569 err = -EINVAL;
1570 goto out5;
1571 }
1572
1573 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1574 } else {
1575 attr->res.data_off = SIZEOF_RESIDENT_LE;
1576 attr->res.data_size = cpu_to_le32(nsize);
1577 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1578 nsize = 0;
1579 }
1580 /* Size of symlink equals the length of input string. */
1581 inode->i_size = size;
1582
1583 attr->size = cpu_to_le32(asize);
1584
1585 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1586 &new_de->ref);
1587 if (err)
1588 goto out5;
1589
1590 rp_inserted = true;
1591 }
1592
1593 attr = Add2Ptr(attr, asize);
1594 attr->type = ATTR_END;
1595
1596 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1597 rec->next_attr_id = cpu_to_le16(aid);
1598
1599 /* Step 2: Add new name in index. */
1600 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1601 if (err)
1602 goto out6;
1603
1604 /* Unlock parent directory before ntfs_init_acl. */
1605 if (!fnd)
1606 ni_unlock(dir_ni);
1607
1608 inode->i_generation = le16_to_cpu(rec->seq);
1609
1610 dir->i_mtime = dir->i_ctime = inode->i_atime;
1611
1612 if (S_ISDIR(mode)) {
1613 inode->i_op = &ntfs_dir_inode_operations;
1614 inode->i_fop = &ntfs_dir_operations;
1615 } else if (S_ISLNK(mode)) {
1616 inode->i_op = &ntfs_link_inode_operations;
1617 inode->i_fop = NULL;
1618 inode->i_mapping->a_ops = &ntfs_aops;
1619 inode->i_size = size;
1620 inode_nohighmem(inode);
1621 } else if (S_ISREG(mode)) {
1622 inode->i_op = &ntfs_file_inode_operations;
1623 inode->i_fop = &ntfs_file_operations;
1624 inode->i_mapping->a_ops =
1625 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
1626 init_rwsem(&ni->file.run_lock);
1627 } else {
1628 inode->i_op = &ntfs_special_inode_operations;
1629 init_special_inode(inode, mode, dev);
1630 }
1631
1632 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1633 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1634 err = ntfs_init_acl(mnt_userns, inode, dir);
1635 if (err)
1636 goto out7;
1637 } else
1638 #endif
1639 {
1640 inode->i_flags |= S_NOSEC;
1641 }
1642
1643 /* Write non resident data. */
1644 if (nsize) {
1645 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0);
1646 if (err)
1647 goto out7;
1648 }
1649
1650 /*
1651 * Call 'd_instantiate' after inode->i_op is set
1652 * but before finish_open.
1653 */
1654 d_instantiate(dentry, inode);
1655
1656 ntfs_save_wsl_perm(inode);
1657 mark_inode_dirty(dir);
1658 mark_inode_dirty(inode);
1659
1660 /* Normal exit. */
1661 goto out2;
1662
1663 out7:
1664
1665 /* Undo 'indx_insert_entry'. */
1666 if (!fnd)
1667 ni_lock_dir(dir_ni);
1668 indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
1669 le16_to_cpu(new_de->key_size), sbi);
1670 /* ni_unlock(dir_ni); will be called later. */
1671 out6:
1672 if (rp_inserted)
1673 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1674
1675 out5:
1676 if (!S_ISDIR(mode))
1677 run_deallocate(sbi, &ni->file.run, false);
1678
1679 out4:
1680 clear_rec_inuse(rec);
1681 clear_nlink(inode);
1682 ni->mi.dirty = false;
1683 discard_new_inode(inode);
1684 out3:
1685 ntfs_mark_rec_free(sbi, ino, false);
1686
1687 out2:
1688 __putname(new_de);
1689 kfree(rp);
1690
1691 out1:
1692 if (err) {
1693 if (!fnd)
1694 ni_unlock(dir_ni);
1695 return ERR_PTR(err);
1696 }
1697
1698 unlock_new_inode(inode);
1699
1700 return inode;
1701 }
1702
1703 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1704 {
1705 int err;
1706 struct ntfs_inode *ni = ntfs_i(inode);
1707 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1708 struct NTFS_DE *de;
1709
1710 /* Allocate PATH_MAX bytes. */
1711 de = __getname();
1712 if (!de)
1713 return -ENOMEM;
1714
1715 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1716 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1717
1718 /* Construct 'de'. */
1719 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1720 if (err)
1721 goto out;
1722
1723 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1724 out:
1725 __putname(de);
1726 return err;
1727 }
1728
1729 /*
1730 * ntfs_unlink_inode
1731 *
1732 * inode_operations::unlink
1733 * inode_operations::rmdir
1734 */
1735 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1736 {
1737 int err;
1738 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1739 struct inode *inode = d_inode(dentry);
1740 struct ntfs_inode *ni = ntfs_i(inode);
1741 struct ntfs_inode *dir_ni = ntfs_i(dir);
1742 struct NTFS_DE *de, *de2 = NULL;
1743 int undo_remove;
1744
1745 if (ntfs_is_meta_file(sbi, ni->mi.rno))
1746 return -EINVAL;
1747
1748 /* Allocate PATH_MAX bytes. */
1749 de = __getname();
1750 if (!de)
1751 return -ENOMEM;
1752
1753 ni_lock(ni);
1754
1755 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1756 err = -ENOTEMPTY;
1757 goto out;
1758 }
1759
1760 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1761 if (err < 0)
1762 goto out;
1763
1764 undo_remove = 0;
1765 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1766
1767 if (!err) {
1768 drop_nlink(inode);
1769 dir->i_mtime = dir->i_ctime = current_time(dir);
1770 mark_inode_dirty(dir);
1771 inode->i_ctime = dir->i_ctime;
1772 if (inode->i_nlink)
1773 mark_inode_dirty(inode);
1774 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1775 _ntfs_bad_inode(inode);
1776 } else {
1777 if (ni_is_dirty(dir))
1778 mark_inode_dirty(dir);
1779 if (ni_is_dirty(inode))
1780 mark_inode_dirty(inode);
1781 }
1782
1783 out:
1784 ni_unlock(ni);
1785 __putname(de);
1786 return err;
1787 }
1788
1789 void ntfs_evict_inode(struct inode *inode)
1790 {
1791 truncate_inode_pages_final(&inode->i_data);
1792
1793 if (inode->i_nlink)
1794 _ni_write_inode(inode, inode_needs_sync(inode));
1795
1796 invalidate_inode_buffers(inode);
1797 clear_inode(inode);
1798
1799 ni_clear(ntfs_i(inode));
1800 }
1801
1802 /*
1803 * ntfs_translate_junction
1804 *
1805 * Translate a Windows junction target to the Linux equivalent.
1806 * On junctions, targets are always absolute (they include the drive
1807 * letter). We have no way of knowing if the target is for the current
1808 * mounted device or not so we just assume it is.
1809 */
1810 static int ntfs_translate_junction(const struct super_block *sb,
1811 const struct dentry *link_de, char *target,
1812 int target_len, int target_max)
1813 {
1814 int tl_len, err = target_len;
1815 char *link_path_buffer = NULL, *link_path;
1816 char *translated = NULL;
1817 char *target_start;
1818 int copy_len;
1819
1820 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1821 if (!link_path_buffer) {
1822 err = -ENOMEM;
1823 goto out;
1824 }
1825 /* Get link path, relative to mount point */
1826 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1827 if (IS_ERR(link_path)) {
1828 ntfs_err(sb, "Error getting link path");
1829 err = -EINVAL;
1830 goto out;
1831 }
1832
1833 translated = kmalloc(PATH_MAX, GFP_NOFS);
1834 if (!translated) {
1835 err = -ENOMEM;
1836 goto out;
1837 }
1838
1839 /* Make translated path a relative path to mount point */
1840 strcpy(translated, "./");
1841 ++link_path; /* Skip leading / */
1842 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1843 if (*link_path == '/') {
1844 if (PATH_MAX - tl_len < sizeof("../")) {
1845 ntfs_err(sb,
1846 "Link path %s has too many components",
1847 link_path);
1848 err = -EINVAL;
1849 goto out;
1850 }
1851 strcpy(translated + tl_len, "../");
1852 tl_len += sizeof("../") - 1;
1853 }
1854 }
1855
1856 /* Skip drive letter */
1857 target_start = target;
1858 while (*target_start && *target_start != ':')
1859 ++target_start;
1860
1861 if (!*target_start) {
1862 ntfs_err(sb, "Link target (%s) missing drive separator",
1863 target);
1864 err = -EINVAL;
1865 goto out;
1866 }
1867
1868 /* Skip drive separator and leading /, if exists */
1869 target_start += 1 + (target_start[1] == '/');
1870 copy_len = target_len - (target_start - target);
1871
1872 if (PATH_MAX - tl_len <= copy_len) {
1873 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1874 target_start, PATH_MAX - tl_len, copy_len);
1875 err = -EINVAL;
1876 goto out;
1877 }
1878
1879 /* translated path has a trailing / and target_start does not */
1880 strcpy(translated + tl_len, target_start);
1881 tl_len += copy_len;
1882 if (target_max <= tl_len) {
1883 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1884 translated, target_max, tl_len);
1885 err = -EINVAL;
1886 goto out;
1887 }
1888 strcpy(target, translated);
1889 err = tl_len;
1890
1891 out:
1892 kfree(link_path_buffer);
1893 kfree(translated);
1894 return err;
1895 }
1896
1897 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1898 struct inode *inode, char *buffer,
1899 int buflen)
1900 {
1901 int i, err = -EINVAL;
1902 struct ntfs_inode *ni = ntfs_i(inode);
1903 struct super_block *sb = inode->i_sb;
1904 struct ntfs_sb_info *sbi = sb->s_fs_info;
1905 u64 size;
1906 u16 ulen = 0;
1907 void *to_free = NULL;
1908 struct REPARSE_DATA_BUFFER *rp;
1909 const __le16 *uname;
1910 struct ATTRIB *attr;
1911
1912 /* Reparse data present. Try to parse it. */
1913 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1914 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1915
1916 *buffer = 0;
1917
1918 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1919 if (!attr)
1920 goto out;
1921
1922 if (!attr->non_res) {
1923 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1924 if (!rp)
1925 goto out;
1926 size = le32_to_cpu(attr->res.data_size);
1927 } else {
1928 size = le64_to_cpu(attr->nres.data_size);
1929 rp = NULL;
1930 }
1931
1932 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1933 goto out;
1934
1935 if (!rp) {
1936 rp = kmalloc(size, GFP_NOFS);
1937 if (!rp) {
1938 err = -ENOMEM;
1939 goto out;
1940 }
1941 to_free = rp;
1942 /* Read into temporal buffer. */
1943 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1944 if (err)
1945 goto out;
1946 }
1947
1948 /* Microsoft Tag. */
1949 switch (rp->ReparseTag) {
1950 case IO_REPARSE_TAG_MOUNT_POINT:
1951 /* Mount points and junctions. */
1952 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1953 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1954 MountPointReparseBuffer.PathBuffer))
1955 goto out;
1956 uname = Add2Ptr(rp,
1957 offsetof(struct REPARSE_DATA_BUFFER,
1958 MountPointReparseBuffer.PathBuffer) +
1959 le16_to_cpu(rp->MountPointReparseBuffer
1960 .PrintNameOffset));
1961 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1962 break;
1963
1964 case IO_REPARSE_TAG_SYMLINK:
1965 /* FolderSymbolicLink */
1966 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1967 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1968 SymbolicLinkReparseBuffer.PathBuffer))
1969 goto out;
1970 uname = Add2Ptr(
1971 rp, offsetof(struct REPARSE_DATA_BUFFER,
1972 SymbolicLinkReparseBuffer.PathBuffer) +
1973 le16_to_cpu(rp->SymbolicLinkReparseBuffer
1974 .PrintNameOffset));
1975 ulen = le16_to_cpu(
1976 rp->SymbolicLinkReparseBuffer.PrintNameLength);
1977 break;
1978
1979 case IO_REPARSE_TAG_CLOUD:
1980 case IO_REPARSE_TAG_CLOUD_1:
1981 case IO_REPARSE_TAG_CLOUD_2:
1982 case IO_REPARSE_TAG_CLOUD_3:
1983 case IO_REPARSE_TAG_CLOUD_4:
1984 case IO_REPARSE_TAG_CLOUD_5:
1985 case IO_REPARSE_TAG_CLOUD_6:
1986 case IO_REPARSE_TAG_CLOUD_7:
1987 case IO_REPARSE_TAG_CLOUD_8:
1988 case IO_REPARSE_TAG_CLOUD_9:
1989 case IO_REPARSE_TAG_CLOUD_A:
1990 case IO_REPARSE_TAG_CLOUD_B:
1991 case IO_REPARSE_TAG_CLOUD_C:
1992 case IO_REPARSE_TAG_CLOUD_D:
1993 case IO_REPARSE_TAG_CLOUD_E:
1994 case IO_REPARSE_TAG_CLOUD_F:
1995 err = sizeof("OneDrive") - 1;
1996 if (err > buflen)
1997 err = buflen;
1998 memcpy(buffer, "OneDrive", err);
1999 goto out;
2000
2001 default:
2002 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2003 /* Unknown Microsoft Tag. */
2004 goto out;
2005 }
2006 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2007 size <= sizeof(struct REPARSE_POINT)) {
2008 goto out;
2009 }
2010
2011 /* Users tag. */
2012 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2013 ulen = le16_to_cpu(rp->ReparseDataLength) -
2014 sizeof(struct REPARSE_POINT);
2015 }
2016
2017 /* Convert nlen from bytes to UNICODE chars. */
2018 ulen >>= 1;
2019
2020 /* Check that name is available. */
2021 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2022 goto out;
2023
2024 /* If name is already zero terminated then truncate it now. */
2025 if (!uname[ulen - 1])
2026 ulen -= 1;
2027
2028 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2029
2030 if (err < 0)
2031 goto out;
2032
2033 /* Translate Windows '\' into Linux '/'. */
2034 for (i = 0; i < err; i++) {
2035 if (buffer[i] == '\\')
2036 buffer[i] = '/';
2037 }
2038
2039 /* Always set last zero. */
2040 buffer[err] = 0;
2041
2042 /* If this is a junction, translate the link target. */
2043 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2044 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2045
2046 out:
2047 kfree(to_free);
2048 return err;
2049 }
2050
2051 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2052 struct delayed_call *done)
2053 {
2054 int err;
2055 char *ret;
2056
2057 if (!de)
2058 return ERR_PTR(-ECHILD);
2059
2060 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2061 if (!ret)
2062 return ERR_PTR(-ENOMEM);
2063
2064 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2065 if (err < 0) {
2066 kfree(ret);
2067 return ERR_PTR(err);
2068 }
2069
2070 set_delayed_call(done, kfree_link, ret);
2071
2072 return ret;
2073 }
2074
2075 // clang-format off
2076 const struct inode_operations ntfs_link_inode_operations = {
2077 .get_link = ntfs_get_link,
2078 .setattr = ntfs3_setattr,
2079 .listxattr = ntfs_listxattr,
2080 .permission = ntfs_permission,
2081 };
2082
2083 const struct address_space_operations ntfs_aops = {
2084 .read_folio = ntfs_read_folio,
2085 .readahead = ntfs_readahead,
2086 .writepage = ntfs_writepage,
2087 .writepages = ntfs_writepages,
2088 .write_begin = ntfs_write_begin,
2089 .write_end = ntfs_write_end,
2090 .direct_IO = ntfs_direct_IO,
2091 .bmap = ntfs_bmap,
2092 .dirty_folio = block_dirty_folio,
2093 .invalidate_folio = block_invalidate_folio,
2094 };
2095
2096 const struct address_space_operations ntfs_aops_cmpr = {
2097 .read_folio = ntfs_read_folio,
2098 .readahead = ntfs_readahead,
2099 };
2100 // clang-format on
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