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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 parse MFT.
22 */
23static 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, links = 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 struct timespec64 ts;
48
49 inode->i_op = NULL;
50 /* Setup 'uid' and 'gid' */
51 inode->i_uid = sbi->options->fs_uid;
52 inode->i_gid = sbi->options->fs_gid;
53
54 err = mi_init(&ni->mi, sbi, ino);
55 if (err)
56 goto out;
57
58 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
59 t64 = sbi->mft.lbo >> sbi->cluster_bits;
60 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
61 sbi->mft.ni = ni;
62 init_rwsem(&ni->file.run_lock);
63
64 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
65 err = -ENOMEM;
66 goto out;
67 }
68 }
69
70 err = mi_read(&ni->mi, ino == MFT_REC_MFT);
71
72 if (err)
73 goto out;
74
75 rec = ni->mi.mrec;
76
77 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
78 ;
79 } else if (ref->seq != rec->seq) {
80 err = -EINVAL;
81 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
82 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
83 goto out;
84 } else if (!is_rec_inuse(rec)) {
85 err = -ESTALE;
86 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
87 goto out;
88 }
89
90 if (le32_to_cpu(rec->total) != sbi->record_size) {
91 /* Bad inode? */
92 err = -EINVAL;
93 goto out;
94 }
95
96 if (!is_rec_base(rec)) {
97 err = -EINVAL;
98 goto out;
99 }
100
101 /* Record should contain $I30 root. */
102 is_dir = rec->flags & RECORD_FLAG_DIR;
103
104 /* MFT_REC_MFT is not a dir */
105 if (is_dir && ino == MFT_REC_MFT) {
106 err = -EINVAL;
107 goto out;
108 }
109
110 inode->i_generation = le16_to_cpu(rec->seq);
111
112 /* Enumerate all struct Attributes MFT. */
113 le = NULL;
114 attr = NULL;
115
116 /*
117 * To reduce tab pressure use goto instead of
118 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
119 */
120next_attr:
121 run = NULL;
122 err = -EINVAL;
123 attr = ni_enum_attr_ex(ni, attr, &le, NULL);
124 if (!attr)
125 goto end_enum;
126
127 if (le && le->vcn) {
128 /* This is non primary attribute segment. Ignore if not MFT. */
129 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
130 goto next_attr;
131
132 run = &ni->file.run;
133 asize = le32_to_cpu(attr->size);
134 goto attr_unpack_run;
135 }
136
137 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
138 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
139 asize = le32_to_cpu(attr->size);
140
141 /*
142 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'.
143 * There not critical to check this case again
144 */
145 if (attr->name_len &&
146 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) >
147 asize)
148 goto out;
149
150 if (attr->non_res) {
151 t64 = le64_to_cpu(attr->nres.alloc_size);
152 if (le64_to_cpu(attr->nres.data_size) > t64 ||
153 le64_to_cpu(attr->nres.valid_size) > t64)
154 goto out;
155 }
156
157 switch (attr->type) {
158 case ATTR_STD:
159 if (attr->non_res ||
160 asize < sizeof(struct ATTR_STD_INFO) + roff ||
161 rsize < sizeof(struct ATTR_STD_INFO))
162 goto out;
163
164 if (std5)
165 goto next_attr;
166
167 std5 = Add2Ptr(attr, roff);
168
169#ifdef STATX_BTIME
170 nt2kernel(std5->cr_time, &ni->i_crtime);
171#endif
172 nt2kernel(std5->a_time, &ts);
173 inode_set_atime_to_ts(inode, ts);
174 nt2kernel(std5->c_time, &ts);
175 inode_set_ctime_to_ts(inode, ts);
176 nt2kernel(std5->m_time, &ts);
177 inode_set_mtime_to_ts(inode, ts);
178
179 ni->std_fa = std5->fa;
180
181 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
182 rsize >= sizeof(struct ATTR_STD_INFO5))
183 ni->std_security_id = std5->security_id;
184 goto next_attr;
185
186 case ATTR_LIST:
187 if (attr->name_len || le || ino == MFT_REC_LOG)
188 goto out;
189
190 err = ntfs_load_attr_list(ni, attr);
191 if (err)
192 goto out;
193
194 le = NULL;
195 attr = NULL;
196 goto next_attr;
197
198 case ATTR_NAME:
199 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
200 rsize < SIZEOF_ATTRIBUTE_FILENAME)
201 goto out;
202
203 names += 1;
204 fname = Add2Ptr(attr, roff);
205 if (fname->type == FILE_NAME_DOS)
206 goto next_attr;
207
208 links += 1;
209 if (name && name->len == fname->name_len &&
210 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
211 NULL, false))
212 is_match = true;
213
214 goto next_attr;
215
216 case ATTR_DATA:
217 if (is_dir) {
218 /* Ignore data attribute in dir record. */
219 goto next_attr;
220 }
221
222 if (ino == MFT_REC_BADCLUST && !attr->non_res)
223 goto next_attr;
224
225 if (attr->name_len &&
226 ((ino != MFT_REC_BADCLUST || !attr->non_res ||
227 attr->name_len != ARRAY_SIZE(BAD_NAME) ||
228 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
229 (ino != MFT_REC_SECURE || !attr->non_res ||
230 attr->name_len != ARRAY_SIZE(SDS_NAME) ||
231 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
232 /* File contains stream attribute. Ignore it. */
233 goto next_attr;
234 }
235
236 if (is_attr_sparsed(attr))
237 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
238 else
239 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
240
241 if (is_attr_compressed(attr))
242 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
243 else
244 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
245
246 if (is_attr_encrypted(attr))
247 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
248 else
249 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
250
251 if (!attr->non_res) {
252 ni->i_valid = inode->i_size = rsize;
253 inode_set_bytes(inode, rsize);
254 }
255
256 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
257
258 if (!attr->non_res) {
259 ni->ni_flags |= NI_FLAG_RESIDENT;
260 goto next_attr;
261 }
262
263 inode_set_bytes(inode, attr_ondisk_size(attr));
264
265 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
266 inode->i_size = le64_to_cpu(attr->nres.data_size);
267 if (!attr->nres.alloc_size)
268 goto next_attr;
269
270 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
271 &ni->file.run;
272 break;
273
274 case ATTR_ROOT:
275 if (attr->non_res)
276 goto out;
277
278 root = Add2Ptr(attr, roff);
279
280 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
281 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
282 goto next_attr;
283
284 if (root->type != ATTR_NAME ||
285 root->rule != NTFS_COLLATION_TYPE_FILENAME)
286 goto out;
287
288 if (!is_dir)
289 goto next_attr;
290
291 is_root = true;
292 ni->ni_flags |= NI_FLAG_DIR;
293
294 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
295 if (err)
296 goto out;
297
298 mode = sb->s_root ?
299 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
300 (S_IFDIR | 0777);
301 goto next_attr;
302
303 case ATTR_ALLOC:
304 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
305 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
306 goto next_attr;
307
308 inode->i_size = le64_to_cpu(attr->nres.data_size);
309 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
310 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
311
312 run = &ni->dir.alloc_run;
313 break;
314
315 case ATTR_BITMAP:
316 if (ino == MFT_REC_MFT) {
317 if (!attr->non_res)
318 goto out;
319#ifndef CONFIG_NTFS3_64BIT_CLUSTER
320 /* 0x20000000 = 2^32 / 8 */
321 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
322 goto out;
323#endif
324 run = &sbi->mft.bitmap.run;
325 break;
326 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
327 !memcmp(attr_name(attr), I30_NAME,
328 sizeof(I30_NAME)) &&
329 attr->non_res) {
330 run = &ni->dir.bitmap_run;
331 break;
332 }
333 goto next_attr;
334
335 case ATTR_REPARSE:
336 if (attr->name_len)
337 goto next_attr;
338
339 rp_fa = ni_parse_reparse(ni, attr, &rp);
340 switch (rp_fa) {
341 case REPARSE_LINK:
342 /*
343 * Normal symlink.
344 * Assume one unicode symbol == one utf8.
345 */
346 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
347 .PrintNameLength) /
348 sizeof(u16);
349 ni->i_valid = inode->i_size;
350 /* Clear directory bit. */
351 if (ni->ni_flags & NI_FLAG_DIR) {
352 indx_clear(&ni->dir);
353 memset(&ni->dir, 0, sizeof(ni->dir));
354 ni->ni_flags &= ~NI_FLAG_DIR;
355 } else {
356 run_close(&ni->file.run);
357 }
358 mode = S_IFLNK | 0777;
359 is_dir = false;
360 if (attr->non_res) {
361 run = &ni->file.run;
362 goto attr_unpack_run; // Double break.
363 }
364 break;
365
366 case REPARSE_COMPRESSED:
367 break;
368
369 case REPARSE_DEDUPLICATED:
370 break;
371 }
372 goto next_attr;
373
374 case ATTR_EA_INFO:
375 if (!attr->name_len &&
376 resident_data_ex(attr, sizeof(struct EA_INFO))) {
377 ni->ni_flags |= NI_FLAG_EA;
378 /*
379 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
380 */
381 inode->i_mode = mode;
382 ntfs_get_wsl_perm(inode);
383 mode = inode->i_mode;
384 }
385 goto next_attr;
386
387 default:
388 goto next_attr;
389 }
390
391attr_unpack_run:
392 roff = le16_to_cpu(attr->nres.run_off);
393
394 if (roff > asize) {
395 err = -EINVAL;
396 goto out;
397 }
398
399 t64 = le64_to_cpu(attr->nres.svcn);
400
401 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
402 t64, Add2Ptr(attr, roff), asize - roff);
403 if (err < 0)
404 goto out;
405 err = 0;
406 goto next_attr;
407
408end_enum:
409
410 if (!std5)
411 goto out;
412
413 if (is_bad_inode(inode))
414 goto out;
415
416 if (!is_match && name) {
417 err = -ENOENT;
418 goto out;
419 }
420
421 if (std5->fa & FILE_ATTRIBUTE_READONLY)
422 mode &= ~0222;
423
424 if (!names) {
425 err = -EINVAL;
426 goto out;
427 }
428
429 if (names != le16_to_cpu(rec->hard_links)) {
430 /* Correct minor error on the fly. Do not mark inode as dirty. */
431 ntfs_inode_warn(inode, "Correct links count -> %u.", names);
432 rec->hard_links = cpu_to_le16(names);
433 ni->mi.dirty = true;
434 }
435
436 set_nlink(inode, links);
437
438 if (S_ISDIR(mode)) {
439 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
440
441 /*
442 * Dot and dot-dot should be included in count but was not
443 * included in enumeration.
444 * Usually a hard links to directories are disabled.
445 */
446 inode->i_op = &ntfs_dir_inode_operations;
447 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
448 &ntfs_legacy_dir_operations :
449 &ntfs_dir_operations;
450 ni->i_valid = 0;
451 } else if (S_ISLNK(mode)) {
452 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
453 inode->i_op = &ntfs_link_inode_operations;
454 inode->i_fop = NULL;
455 inode_nohighmem(inode);
456 } else if (S_ISREG(mode)) {
457 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
458 inode->i_op = &ntfs_file_inode_operations;
459 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
460 &ntfs_legacy_file_operations :
461 &ntfs_file_operations;
462 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
463 &ntfs_aops;
464 if (ino != MFT_REC_MFT)
465 init_rwsem(&ni->file.run_lock);
466 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
467 S_ISSOCK(mode)) {
468 inode->i_op = &ntfs_special_inode_operations;
469 init_special_inode(inode, mode, inode->i_rdev);
470 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
471 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
472 /* Records in $Extend are not a files or general directories. */
473 inode->i_op = &ntfs_file_inode_operations;
474 } else {
475 err = -EINVAL;
476 goto out;
477 }
478
479 if ((sbi->options->sys_immutable &&
480 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
481 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
482 inode->i_flags |= S_IMMUTABLE;
483 } else {
484 inode->i_flags &= ~S_IMMUTABLE;
485 }
486
487 inode->i_mode = mode;
488 if (!(ni->ni_flags & NI_FLAG_EA)) {
489 /* If no xattr then no security (stored in xattr). */
490 inode->i_flags |= S_NOSEC;
491 }
492
493 if (ino == MFT_REC_MFT && !sb->s_root)
494 sbi->mft.ni = NULL;
495
496 unlock_new_inode(inode);
497
498 return inode;
499
500out:
501 if (ino == MFT_REC_MFT && !sb->s_root)
502 sbi->mft.ni = NULL;
503
504 iget_failed(inode);
505 return ERR_PTR(err);
506}
507
508/*
509 * ntfs_test_inode
510 *
511 * Return: 1 if match.
512 */
513static int ntfs_test_inode(struct inode *inode, void *data)
514{
515 struct MFT_REF *ref = data;
516
517 return ino_get(ref) == inode->i_ino;
518}
519
520static int ntfs_set_inode(struct inode *inode, void *data)
521{
522 const struct MFT_REF *ref = data;
523
524 inode->i_ino = ino_get(ref);
525 return 0;
526}
527
528struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
529 const struct cpu_str *name)
530{
531 struct inode *inode;
532
533 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
534 (void *)ref);
535 if (unlikely(!inode))
536 return ERR_PTR(-ENOMEM);
537
538 /* If this is a freshly allocated inode, need to read it now. */
539 if (inode->i_state & I_NEW)
540 inode = ntfs_read_mft(inode, name, ref);
541 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
542 /*
543 * Sequence number is not expected.
544 * Looks like inode was reused but caller uses the old reference
545 */
546 iput(inode);
547 inode = ERR_PTR(-ESTALE);
548 }
549
550 if (IS_ERR(inode))
551 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
552
553 return inode;
554}
555
556enum get_block_ctx {
557 GET_BLOCK_GENERAL = 0,
558 GET_BLOCK_WRITE_BEGIN = 1,
559 GET_BLOCK_DIRECT_IO_R = 2,
560 GET_BLOCK_DIRECT_IO_W = 3,
561 GET_BLOCK_BMAP = 4,
562};
563
564static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
565 struct buffer_head *bh, int create,
566 enum get_block_ctx ctx)
567{
568 struct super_block *sb = inode->i_sb;
569 struct ntfs_sb_info *sbi = sb->s_fs_info;
570 struct ntfs_inode *ni = ntfs_i(inode);
571 struct folio *folio = bh->b_folio;
572 u8 cluster_bits = sbi->cluster_bits;
573 u32 block_size = sb->s_blocksize;
574 u64 bytes, lbo, valid;
575 u32 off;
576 int err;
577 CLST vcn, lcn, len;
578 bool new;
579
580 /* Clear previous state. */
581 clear_buffer_new(bh);
582 clear_buffer_uptodate(bh);
583
584 if (is_resident(ni)) {
585 bh->b_blocknr = RESIDENT_LCN;
586 bh->b_size = block_size;
587 if (!folio) {
588 /* direct io (read) or bmap call */
589 err = 0;
590 } else {
591 ni_lock(ni);
592 err = attr_data_read_resident(ni, folio);
593 ni_unlock(ni);
594
595 if (!err)
596 set_buffer_uptodate(bh);
597 }
598 return err;
599 }
600
601 vcn = vbo >> cluster_bits;
602 off = vbo & sbi->cluster_mask;
603 new = false;
604
605 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
606 create && sbi->cluster_size > PAGE_SIZE);
607 if (err)
608 goto out;
609
610 if (!len)
611 return 0;
612
613 bytes = ((u64)len << cluster_bits) - off;
614
615 if (lcn >= sbi->used.bitmap.nbits) {
616 /* This case includes resident/compressed/sparse. */
617 if (!create) {
618 if (bh->b_size > bytes)
619 bh->b_size = bytes;
620 return 0;
621 }
622 WARN_ON(1);
623 }
624
625 if (new)
626 set_buffer_new(bh);
627
628 lbo = ((u64)lcn << cluster_bits) + off;
629
630 set_buffer_mapped(bh);
631 bh->b_bdev = sb->s_bdev;
632 bh->b_blocknr = lbo >> sb->s_blocksize_bits;
633
634 valid = ni->i_valid;
635
636 if (ctx == GET_BLOCK_DIRECT_IO_W) {
637 /* ntfs_direct_IO will update ni->i_valid. */
638 if (vbo >= valid)
639 set_buffer_new(bh);
640 } else if (create) {
641 /* Normal write. */
642 if (bytes > bh->b_size)
643 bytes = bh->b_size;
644
645 if (vbo >= valid)
646 set_buffer_new(bh);
647
648 if (vbo + bytes > valid) {
649 ni->i_valid = vbo + bytes;
650 mark_inode_dirty(inode);
651 }
652 } else if (vbo >= valid) {
653 /* Read out of valid data. */
654 clear_buffer_mapped(bh);
655 } else if (vbo + bytes <= valid) {
656 /* Normal read. */
657 } else if (vbo + block_size <= valid) {
658 /* Normal short read. */
659 bytes = block_size;
660 } else {
661 /*
662 * Read across valid size: vbo < valid && valid < vbo + block_size
663 */
664 bytes = block_size;
665
666 if (folio) {
667 u32 voff = valid - vbo;
668
669 bh->b_size = block_size;
670 off = vbo & (PAGE_SIZE - 1);
671 folio_set_bh(bh, folio, off);
672
673 if (bh_read(bh, 0) < 0) {
674 err = -EIO;
675 goto out;
676 }
677 folio_zero_segment(folio, off + voff, off + block_size);
678 }
679 }
680
681 if (bh->b_size > bytes)
682 bh->b_size = bytes;
683
684#ifndef __LP64__
685 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
686 static_assert(sizeof(size_t) < sizeof(loff_t));
687 if (bytes > 0x40000000u)
688 bh->b_size = 0x40000000u;
689 }
690#endif
691
692 return 0;
693
694out:
695 return err;
696}
697
698int ntfs_get_block(struct inode *inode, sector_t vbn,
699 struct buffer_head *bh_result, int create)
700{
701 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
702 bh_result, create, GET_BLOCK_GENERAL);
703}
704
705static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
706 struct buffer_head *bh_result, int create)
707{
708 return ntfs_get_block_vbo(inode,
709 (u64)vsn << inode->i_sb->s_blocksize_bits,
710 bh_result, create, GET_BLOCK_BMAP);
711}
712
713static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
714{
715 return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
716}
717
718static int ntfs_read_folio(struct file *file, struct folio *folio)
719{
720 int err;
721 struct address_space *mapping = folio->mapping;
722 struct inode *inode = mapping->host;
723 struct ntfs_inode *ni = ntfs_i(inode);
724
725 if (is_resident(ni)) {
726 ni_lock(ni);
727 err = attr_data_read_resident(ni, folio);
728 ni_unlock(ni);
729 if (err != E_NTFS_NONRESIDENT) {
730 folio_unlock(folio);
731 return err;
732 }
733 }
734
735 if (is_compressed(ni)) {
736 ni_lock(ni);
737 err = ni_readpage_cmpr(ni, folio);
738 ni_unlock(ni);
739 return err;
740 }
741
742 /* Normal + sparse files. */
743 return mpage_read_folio(folio, ntfs_get_block);
744}
745
746static void ntfs_readahead(struct readahead_control *rac)
747{
748 struct address_space *mapping = rac->mapping;
749 struct inode *inode = mapping->host;
750 struct ntfs_inode *ni = ntfs_i(inode);
751 u64 valid;
752 loff_t pos;
753
754 if (is_resident(ni)) {
755 /* No readahead for resident. */
756 return;
757 }
758
759 if (is_compressed(ni)) {
760 /* No readahead for compressed. */
761 return;
762 }
763
764 valid = ni->i_valid;
765 pos = readahead_pos(rac);
766
767 if (valid < i_size_read(inode) && pos <= valid &&
768 valid < pos + readahead_length(rac)) {
769 /* Range cross 'valid'. Read it page by page. */
770 return;
771 }
772
773 mpage_readahead(rac, ntfs_get_block);
774}
775
776static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
777 struct buffer_head *bh_result, int create)
778{
779 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
780 bh_result, create, GET_BLOCK_DIRECT_IO_R);
781}
782
783static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
784 struct buffer_head *bh_result, int create)
785{
786 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
787 bh_result, create, GET_BLOCK_DIRECT_IO_W);
788}
789
790static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
791{
792 struct file *file = iocb->ki_filp;
793 struct address_space *mapping = file->f_mapping;
794 struct inode *inode = mapping->host;
795 struct ntfs_inode *ni = ntfs_i(inode);
796 loff_t vbo = iocb->ki_pos;
797 loff_t end;
798 int wr = iov_iter_rw(iter) & WRITE;
799 size_t iter_count = iov_iter_count(iter);
800 loff_t valid;
801 ssize_t ret;
802
803 if (is_resident(ni)) {
804 /* Switch to buffered write. */
805 ret = 0;
806 goto out;
807 }
808
809 ret = blockdev_direct_IO(iocb, inode, iter,
810 wr ? ntfs_get_block_direct_IO_W :
811 ntfs_get_block_direct_IO_R);
812
813 if (ret > 0)
814 end = vbo + ret;
815 else if (wr && ret == -EIOCBQUEUED)
816 end = vbo + iter_count;
817 else
818 goto out;
819
820 valid = ni->i_valid;
821 if (wr) {
822 if (end > valid && !S_ISBLK(inode->i_mode)) {
823 ni->i_valid = end;
824 mark_inode_dirty(inode);
825 }
826 } else if (vbo < valid && valid < end) {
827 /* Fix page. */
828 iov_iter_revert(iter, end - valid);
829 iov_iter_zero(end - valid, iter);
830 }
831
832out:
833 return ret;
834}
835
836int ntfs_set_size(struct inode *inode, u64 new_size)
837{
838 struct super_block *sb = inode->i_sb;
839 struct ntfs_sb_info *sbi = sb->s_fs_info;
840 struct ntfs_inode *ni = ntfs_i(inode);
841 int err;
842
843 /* Check for maximum file size. */
844 if (is_sparsed(ni) || is_compressed(ni)) {
845 if (new_size > sbi->maxbytes_sparse) {
846 err = -EFBIG;
847 goto out;
848 }
849 } else if (new_size > sbi->maxbytes) {
850 err = -EFBIG;
851 goto out;
852 }
853
854 ni_lock(ni);
855 down_write(&ni->file.run_lock);
856
857 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
858 &ni->i_valid, true, NULL);
859
860 up_write(&ni->file.run_lock);
861 ni_unlock(ni);
862
863 mark_inode_dirty(inode);
864
865out:
866 return err;
867}
868
869static int ntfs_resident_writepage(struct folio *folio,
870 struct writeback_control *wbc, void *data)
871{
872 struct address_space *mapping = data;
873 struct inode *inode = mapping->host;
874 struct ntfs_inode *ni = ntfs_i(inode);
875 int ret;
876
877 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
878 return -EIO;
879
880 ni_lock(ni);
881 ret = attr_data_write_resident(ni, folio);
882 ni_unlock(ni);
883
884 if (ret != E_NTFS_NONRESIDENT)
885 folio_unlock(folio);
886 mapping_set_error(mapping, ret);
887 return ret;
888}
889
890static int ntfs_writepages(struct address_space *mapping,
891 struct writeback_control *wbc)
892{
893 struct inode *inode = mapping->host;
894
895 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
896 return -EIO;
897
898 if (is_resident(ntfs_i(inode)))
899 return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
900 mapping);
901 return mpage_writepages(mapping, wbc, ntfs_get_block);
902}
903
904static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
905 struct buffer_head *bh_result, int create)
906{
907 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
908 bh_result, create, GET_BLOCK_WRITE_BEGIN);
909}
910
911int ntfs_write_begin(struct file *file, struct address_space *mapping,
912 loff_t pos, u32 len, struct folio **foliop, void **fsdata)
913{
914 int err;
915 struct inode *inode = mapping->host;
916 struct ntfs_inode *ni = ntfs_i(inode);
917
918 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
919 return -EIO;
920
921 if (is_resident(ni)) {
922 struct folio *folio = __filemap_get_folio(
923 mapping, pos >> PAGE_SHIFT, FGP_WRITEBEGIN,
924 mapping_gfp_mask(mapping));
925
926 if (IS_ERR(folio)) {
927 err = PTR_ERR(folio);
928 goto out;
929 }
930
931 ni_lock(ni);
932 err = attr_data_read_resident(ni, folio);
933 ni_unlock(ni);
934
935 if (!err) {
936 *foliop = folio;
937 goto out;
938 }
939 folio_unlock(folio);
940 folio_put(folio);
941
942 if (err != E_NTFS_NONRESIDENT)
943 goto out;
944 }
945
946 err = block_write_begin(mapping, pos, len, foliop,
947 ntfs_get_block_write_begin);
948
949out:
950 return err;
951}
952
953/*
954 * ntfs_write_end - Address_space_operations::write_end.
955 */
956int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
957 u32 len, u32 copied, struct folio *folio, void *fsdata)
958{
959 struct inode *inode = mapping->host;
960 struct ntfs_inode *ni = ntfs_i(inode);
961 u64 valid = ni->i_valid;
962 bool dirty = false;
963 int err;
964
965 if (is_resident(ni)) {
966 ni_lock(ni);
967 err = attr_data_write_resident(ni, folio);
968 ni_unlock(ni);
969 if (!err) {
970 struct buffer_head *head = folio_buffers(folio);
971 dirty = true;
972 /* Clear any buffers in folio. */
973 if (head) {
974 struct buffer_head *bh = head;
975
976 do {
977 clear_buffer_dirty(bh);
978 clear_buffer_mapped(bh);
979 set_buffer_uptodate(bh);
980 } while (head != (bh = bh->b_this_page));
981 }
982 folio_mark_uptodate(folio);
983 err = copied;
984 }
985 folio_unlock(folio);
986 folio_put(folio);
987 } else {
988 err = generic_write_end(file, mapping, pos, len, copied, folio,
989 fsdata);
990 }
991
992 if (err >= 0) {
993 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
994 inode_set_mtime_to_ts(inode,
995 inode_set_ctime_current(inode));
996 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
997 dirty = true;
998 }
999
1000 if (valid != ni->i_valid) {
1001 /* ni->i_valid is changed in ntfs_get_block_vbo. */
1002 dirty = true;
1003 }
1004
1005 if (pos + err > inode->i_size) {
1006 i_size_write(inode, pos + err);
1007 dirty = true;
1008 }
1009
1010 if (dirty)
1011 mark_inode_dirty(inode);
1012 }
1013
1014 return err;
1015}
1016
1017int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1018{
1019 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1020}
1021
1022int ntfs_sync_inode(struct inode *inode)
1023{
1024 return _ni_write_inode(inode, 1);
1025}
1026
1027/*
1028 * writeback_inode - Helper function for ntfs_flush_inodes().
1029 *
1030 * This writes both the inode and the file data blocks, waiting
1031 * for in flight data blocks before the start of the call. It
1032 * does not wait for any io started during the call.
1033 */
1034static int writeback_inode(struct inode *inode)
1035{
1036 int ret = sync_inode_metadata(inode, 0);
1037
1038 if (!ret)
1039 ret = filemap_fdatawrite(inode->i_mapping);
1040 return ret;
1041}
1042
1043/*
1044 * ntfs_flush_inodes
1045 *
1046 * Write data and metadata corresponding to i1 and i2. The io is
1047 * started but we do not wait for any of it to finish.
1048 *
1049 * filemap_flush() is used for the block device, so if there is a dirty
1050 * page for a block already in flight, we will not wait and start the
1051 * io over again.
1052 */
1053int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1054 struct inode *i2)
1055{
1056 int ret = 0;
1057
1058 if (i1)
1059 ret = writeback_inode(i1);
1060 if (!ret && i2)
1061 ret = writeback_inode(i2);
1062 if (!ret)
1063 ret = filemap_flush(sb->s_bdev_file->f_mapping);
1064 return ret;
1065}
1066
1067/*
1068 * Helper function to read file.
1069 */
1070int inode_read_data(struct inode *inode, void *data, size_t bytes)
1071{
1072 pgoff_t idx;
1073 struct address_space *mapping = inode->i_mapping;
1074
1075 for (idx = 0; bytes; idx++) {
1076 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1077 struct page *page = read_mapping_page(mapping, idx, NULL);
1078 void *kaddr;
1079
1080 if (IS_ERR(page))
1081 return PTR_ERR(page);
1082
1083 kaddr = kmap_atomic(page);
1084 memcpy(data, kaddr, op);
1085 kunmap_atomic(kaddr);
1086
1087 put_page(page);
1088
1089 bytes -= op;
1090 data = Add2Ptr(data, PAGE_SIZE);
1091 }
1092 return 0;
1093}
1094
1095/*
1096 * ntfs_reparse_bytes
1097 *
1098 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1099 * for unicode string of @uni_len length.
1100 */
1101static inline u32 ntfs_reparse_bytes(u32 uni_len)
1102{
1103 /* Header + unicode string + decorated unicode string. */
1104 return sizeof(short) * (2 * uni_len + 4) +
1105 offsetof(struct REPARSE_DATA_BUFFER,
1106 SymbolicLinkReparseBuffer.PathBuffer);
1107}
1108
1109static struct REPARSE_DATA_BUFFER *
1110ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1111 u32 size, u16 *nsize)
1112{
1113 int i, err;
1114 struct REPARSE_DATA_BUFFER *rp;
1115 __le16 *rp_name;
1116 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1117
1118 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1119 if (!rp)
1120 return ERR_PTR(-ENOMEM);
1121
1122 rs = &rp->SymbolicLinkReparseBuffer;
1123 rp_name = rs->PathBuffer;
1124
1125 /* Convert link name to UTF-16. */
1126 err = ntfs_nls_to_utf16(sbi, symname, size,
1127 (struct cpu_str *)(rp_name - 1), 2 * size,
1128 UTF16_LITTLE_ENDIAN);
1129 if (err < 0)
1130 goto out;
1131
1132 /* err = the length of unicode name of symlink. */
1133 *nsize = ntfs_reparse_bytes(err);
1134
1135 if (*nsize > sbi->reparse.max_size) {
1136 err = -EFBIG;
1137 goto out;
1138 }
1139
1140 /* Translate Linux '/' into Windows '\'. */
1141 for (i = 0; i < err; i++) {
1142 if (rp_name[i] == cpu_to_le16('/'))
1143 rp_name[i] = cpu_to_le16('\\');
1144 }
1145
1146 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1147 rp->ReparseDataLength =
1148 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1149 SymbolicLinkReparseBuffer));
1150
1151 /* PrintName + SubstituteName. */
1152 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1153 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1154 rs->PrintNameLength = rs->SubstituteNameOffset;
1155
1156 /*
1157 * TODO: Use relative path if possible to allow Windows to
1158 * parse this path.
1159 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1160 */
1161 rs->Flags = 0;
1162
1163 memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1164
1165 /* Decorate SubstituteName. */
1166 rp_name += err;
1167 rp_name[0] = cpu_to_le16('\\');
1168 rp_name[1] = cpu_to_le16('?');
1169 rp_name[2] = cpu_to_le16('?');
1170 rp_name[3] = cpu_to_le16('\\');
1171
1172 return rp;
1173out:
1174 kfree(rp);
1175 return ERR_PTR(err);
1176}
1177
1178/*
1179 * ntfs_create_inode
1180 *
1181 * Helper function for:
1182 * - ntfs_create
1183 * - ntfs_mknod
1184 * - ntfs_symlink
1185 * - ntfs_mkdir
1186 * - ntfs_atomic_open
1187 *
1188 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1189 */
1190int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1191 struct dentry *dentry, const struct cpu_str *uni,
1192 umode_t mode, dev_t dev, const char *symname, u32 size,
1193 struct ntfs_fnd *fnd)
1194{
1195 int err;
1196 struct super_block *sb = dir->i_sb;
1197 struct ntfs_sb_info *sbi = sb->s_fs_info;
1198 const struct qstr *name = &dentry->d_name;
1199 CLST ino = 0;
1200 struct ntfs_inode *dir_ni = ntfs_i(dir);
1201 struct ntfs_inode *ni = NULL;
1202 struct inode *inode = NULL;
1203 struct ATTRIB *attr;
1204 struct ATTR_STD_INFO5 *std5;
1205 struct ATTR_FILE_NAME *fname;
1206 struct MFT_REC *rec;
1207 u32 asize, dsize, sd_size;
1208 enum FILE_ATTRIBUTE fa;
1209 __le32 security_id = SECURITY_ID_INVALID;
1210 CLST vcn;
1211 const void *sd;
1212 u16 t16, nsize = 0, aid = 0;
1213 struct INDEX_ROOT *root, *dir_root;
1214 struct NTFS_DE *e, *new_de = NULL;
1215 struct REPARSE_DATA_BUFFER *rp = NULL;
1216 bool rp_inserted = false;
1217
1218 /* New file will be resident or non resident. */
1219 const bool new_file_resident = 1;
1220
1221 if (!fnd)
1222 ni_lock_dir(dir_ni);
1223
1224 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1225 if (!dir_root) {
1226 err = -EINVAL;
1227 goto out1;
1228 }
1229
1230 if (S_ISDIR(mode)) {
1231 /* Use parent's directory attributes. */
1232 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1233 FILE_ATTRIBUTE_ARCHIVE;
1234 /*
1235 * By default child directory inherits parent attributes.
1236 * Root directory is hidden + system.
1237 * Make an exception for children in root.
1238 */
1239 if (dir->i_ino == MFT_REC_ROOT)
1240 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1241 } else if (S_ISLNK(mode)) {
1242 /* It is good idea that link should be the same type (file/dir) as target */
1243 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1244
1245 /*
1246 * Linux: there are dir/file/symlink and so on.
1247 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1248 * It is good idea to create:
1249 * dir + reparse if 'symname' points to directory
1250 * or
1251 * file + reparse if 'symname' points to file
1252 * Unfortunately kern_path hangs if symname contains 'dir'.
1253 */
1254
1255 /*
1256 * struct path path;
1257 *
1258 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1259 * struct inode *target = d_inode(path.dentry);
1260 *
1261 * if (S_ISDIR(target->i_mode))
1262 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1263 * // if ( target->i_sb == sb ){
1264 * // use relative path?
1265 * // }
1266 * path_put(&path);
1267 * }
1268 */
1269 } else if (S_ISREG(mode)) {
1270 if (sbi->options->sparse) {
1271 /* Sparsed regular file, cause option 'sparse'. */
1272 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1273 FILE_ATTRIBUTE_ARCHIVE;
1274 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1275 /* Compressed regular file, if parent is compressed. */
1276 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1277 } else {
1278 /* Regular file, default attributes. */
1279 fa = FILE_ATTRIBUTE_ARCHIVE;
1280 }
1281 } else {
1282 fa = FILE_ATTRIBUTE_ARCHIVE;
1283 }
1284
1285 /* If option "hide_dot_files" then set hidden attribute for dot files. */
1286 if (sbi->options->hide_dot_files && name->name[0] == '.')
1287 fa |= FILE_ATTRIBUTE_HIDDEN;
1288
1289 if (!(mode & 0222))
1290 fa |= FILE_ATTRIBUTE_READONLY;
1291
1292 /* Allocate PATH_MAX bytes. */
1293 new_de = __getname();
1294 if (!new_de) {
1295 err = -ENOMEM;
1296 goto out1;
1297 }
1298
1299 if (unlikely(ntfs3_forced_shutdown(sb))) {
1300 err = -EIO;
1301 goto out2;
1302 }
1303
1304 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1305 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1306
1307 /* Step 1: allocate and fill new mft record. */
1308 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1309 if (err)
1310 goto out2;
1311
1312 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1313 if (IS_ERR(ni)) {
1314 err = PTR_ERR(ni);
1315 ni = NULL;
1316 goto out3;
1317 }
1318 inode = &ni->vfs_inode;
1319 inode_init_owner(idmap, inode, dir, mode);
1320 mode = inode->i_mode;
1321
1322 ni->i_crtime = current_time(inode);
1323
1324 rec = ni->mi.mrec;
1325 rec->hard_links = cpu_to_le16(1);
1326 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1327
1328 /* Get default security id. */
1329 sd = s_default_security;
1330 sd_size = sizeof(s_default_security);
1331
1332 if (is_ntfs3(sbi)) {
1333 security_id = dir_ni->std_security_id;
1334 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1335 security_id = sbi->security.def_security_id;
1336
1337 if (security_id == SECURITY_ID_INVALID &&
1338 !ntfs_insert_security(sbi, sd, sd_size,
1339 &security_id, NULL))
1340 sbi->security.def_security_id = security_id;
1341 }
1342 }
1343
1344 /* Insert standard info. */
1345 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1346
1347 if (security_id == SECURITY_ID_INVALID) {
1348 dsize = sizeof(struct ATTR_STD_INFO);
1349 } else {
1350 dsize = sizeof(struct ATTR_STD_INFO5);
1351 std5->security_id = security_id;
1352 ni->std_security_id = security_id;
1353 }
1354 asize = SIZEOF_RESIDENT + dsize;
1355
1356 attr->type = ATTR_STD;
1357 attr->size = cpu_to_le32(asize);
1358 attr->id = cpu_to_le16(aid++);
1359 attr->res.data_off = SIZEOF_RESIDENT_LE;
1360 attr->res.data_size = cpu_to_le32(dsize);
1361
1362 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1363 kernel2nt(&ni->i_crtime);
1364
1365 std5->fa = ni->std_fa = fa;
1366
1367 attr = Add2Ptr(attr, asize);
1368
1369 /* Insert file name. */
1370 err = fill_name_de(sbi, new_de, name, uni);
1371 if (err)
1372 goto out4;
1373
1374 mi_get_ref(&ni->mi, &new_de->ref);
1375
1376 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1377
1378 if (sbi->options->windows_names &&
1379 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1380 err = -EINVAL;
1381 goto out4;
1382 }
1383
1384 mi_get_ref(&dir_ni->mi, &fname->home);
1385 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1386 fname->dup.a_time = std5->cr_time;
1387 fname->dup.alloc_size = fname->dup.data_size = 0;
1388 fname->dup.fa = std5->fa;
1389 fname->dup.ea_size = fname->dup.reparse = 0;
1390
1391 dsize = le16_to_cpu(new_de->key_size);
1392 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1393
1394 attr->type = ATTR_NAME;
1395 attr->size = cpu_to_le32(asize);
1396 attr->res.data_off = SIZEOF_RESIDENT_LE;
1397 attr->res.flags = RESIDENT_FLAG_INDEXED;
1398 attr->id = cpu_to_le16(aid++);
1399 attr->res.data_size = cpu_to_le32(dsize);
1400 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1401
1402 attr = Add2Ptr(attr, asize);
1403
1404 if (security_id == SECURITY_ID_INVALID) {
1405 /* Insert security attribute. */
1406 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1407
1408 attr->type = ATTR_SECURE;
1409 attr->size = cpu_to_le32(asize);
1410 attr->id = cpu_to_le16(aid++);
1411 attr->res.data_off = SIZEOF_RESIDENT_LE;
1412 attr->res.data_size = cpu_to_le32(sd_size);
1413 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1414
1415 attr = Add2Ptr(attr, asize);
1416 }
1417
1418 attr->id = cpu_to_le16(aid++);
1419 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1420 /*
1421 * Regular directory or symlink to directory.
1422 * Create root attribute.
1423 */
1424 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1425 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1426
1427 attr->type = ATTR_ROOT;
1428 attr->size = cpu_to_le32(asize);
1429
1430 attr->name_len = ARRAY_SIZE(I30_NAME);
1431 attr->name_off = SIZEOF_RESIDENT_LE;
1432 attr->res.data_off =
1433 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1434 attr->res.data_size = cpu_to_le32(dsize);
1435 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1436 sizeof(I30_NAME));
1437
1438 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1439 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1440 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1441 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1442 sizeof(struct NTFS_DE));
1443 root->ihdr.total = root->ihdr.used;
1444
1445 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1446 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1447 e->flags = NTFS_IE_LAST;
1448 } else if (S_ISLNK(mode)) {
1449 /*
1450 * Symlink to file.
1451 * Create empty resident data attribute.
1452 */
1453 asize = SIZEOF_RESIDENT;
1454
1455 /* Insert empty ATTR_DATA */
1456 attr->type = ATTR_DATA;
1457 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1458 attr->name_off = SIZEOF_RESIDENT_LE;
1459 attr->res.data_off = SIZEOF_RESIDENT_LE;
1460 } else if (!new_file_resident && S_ISREG(mode)) {
1461 /*
1462 * Regular file. Create empty non resident data attribute.
1463 */
1464 attr->type = ATTR_DATA;
1465 attr->non_res = 1;
1466 attr->nres.evcn = cpu_to_le64(-1ll);
1467 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1468 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1469 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1470 attr->flags = ATTR_FLAG_SPARSED;
1471 asize = SIZEOF_NONRESIDENT_EX + 8;
1472 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1473 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1474 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1475 attr->flags = ATTR_FLAG_COMPRESSED;
1476 attr->nres.c_unit = NTFS_LZNT_CUNIT;
1477 asize = SIZEOF_NONRESIDENT_EX + 8;
1478 } else {
1479 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1480 attr->name_off = SIZEOF_NONRESIDENT_LE;
1481 asize = SIZEOF_NONRESIDENT + 8;
1482 }
1483 attr->nres.run_off = attr->name_off;
1484 } else {
1485 /*
1486 * Node. Create empty resident data attribute.
1487 */
1488 attr->type = ATTR_DATA;
1489 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1490 attr->name_off = SIZEOF_RESIDENT_LE;
1491 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1492 attr->flags = ATTR_FLAG_SPARSED;
1493 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1494 attr->flags = ATTR_FLAG_COMPRESSED;
1495 attr->res.data_off = SIZEOF_RESIDENT_LE;
1496 asize = SIZEOF_RESIDENT;
1497 ni->ni_flags |= NI_FLAG_RESIDENT;
1498 }
1499
1500 if (S_ISDIR(mode)) {
1501 ni->ni_flags |= NI_FLAG_DIR;
1502 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1503 if (err)
1504 goto out4;
1505 } else if (S_ISLNK(mode)) {
1506 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1507
1508 if (IS_ERR(rp)) {
1509 err = PTR_ERR(rp);
1510 rp = NULL;
1511 goto out4;
1512 }
1513
1514 /*
1515 * Insert ATTR_REPARSE.
1516 */
1517 attr = Add2Ptr(attr, asize);
1518 attr->type = ATTR_REPARSE;
1519 attr->id = cpu_to_le16(aid++);
1520
1521 /* Resident or non resident? */
1522 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1523 t16 = PtrOffset(rec, attr);
1524
1525 /*
1526 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1527 * It is good idea to keep extended attributes resident.
1528 */
1529 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1530 CLST alen;
1531 CLST clst = bytes_to_cluster(sbi, nsize);
1532
1533 /* Bytes per runs. */
1534 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1535
1536 attr->non_res = 1;
1537 attr->nres.evcn = cpu_to_le64(clst - 1);
1538 attr->name_off = SIZEOF_NONRESIDENT_LE;
1539 attr->nres.run_off = attr->name_off;
1540 attr->nres.data_size = cpu_to_le64(nsize);
1541 attr->nres.valid_size = attr->nres.data_size;
1542 attr->nres.alloc_size =
1543 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1544
1545 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1546 clst, NULL, ALLOCATE_DEF,
1547 &alen, 0, NULL, NULL);
1548 if (err)
1549 goto out5;
1550
1551 err = run_pack(&ni->file.run, 0, clst,
1552 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1553 &vcn);
1554 if (err < 0)
1555 goto out5;
1556
1557 if (vcn != clst) {
1558 err = -EINVAL;
1559 goto out5;
1560 }
1561
1562 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1563 /* Write non resident data. */
1564 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1565 nsize, 0);
1566 if (err)
1567 goto out5;
1568 } else {
1569 attr->res.data_off = SIZEOF_RESIDENT_LE;
1570 attr->res.data_size = cpu_to_le32(nsize);
1571 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1572 }
1573 /* Size of symlink equals the length of input string. */
1574 inode->i_size = size;
1575
1576 attr->size = cpu_to_le32(asize);
1577
1578 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1579 &new_de->ref);
1580 if (err)
1581 goto out5;
1582
1583 rp_inserted = true;
1584 }
1585
1586 attr = Add2Ptr(attr, asize);
1587 attr->type = ATTR_END;
1588
1589 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1590 rec->next_attr_id = cpu_to_le16(aid);
1591
1592 inode->i_generation = le16_to_cpu(rec->seq);
1593
1594 if (S_ISDIR(mode)) {
1595 inode->i_op = &ntfs_dir_inode_operations;
1596 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1597 &ntfs_legacy_dir_operations :
1598 &ntfs_dir_operations;
1599 } else if (S_ISLNK(mode)) {
1600 inode->i_op = &ntfs_link_inode_operations;
1601 inode->i_fop = NULL;
1602 inode->i_mapping->a_ops = &ntfs_aops;
1603 inode->i_size = size;
1604 inode_nohighmem(inode);
1605 } else if (S_ISREG(mode)) {
1606 inode->i_op = &ntfs_file_inode_operations;
1607 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1608 &ntfs_legacy_file_operations :
1609 &ntfs_file_operations;
1610 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1611 &ntfs_aops;
1612 init_rwsem(&ni->file.run_lock);
1613 } else {
1614 inode->i_op = &ntfs_special_inode_operations;
1615 init_special_inode(inode, mode, dev);
1616 }
1617
1618#ifdef CONFIG_NTFS3_FS_POSIX_ACL
1619 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1620 err = ntfs_init_acl(idmap, inode, dir);
1621 if (err)
1622 goto out5;
1623 } else
1624#endif
1625 {
1626 inode->i_flags |= S_NOSEC;
1627 }
1628
1629 /*
1630 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1631 * The packed size of extended attribute is stored in direntry too.
1632 * 'fname' here points to inside new_de.
1633 */
1634 err = ntfs_save_wsl_perm(inode, &fname->dup.ea_size);
1635 if (err)
1636 goto out6;
1637
1638 /*
1639 * update ea_size in file_name attribute too.
1640 * Use ni_find_attr cause layout of MFT record may be changed
1641 * in ntfs_init_acl and ntfs_save_wsl_perm.
1642 */
1643 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
1644 if (attr) {
1645 struct ATTR_FILE_NAME *fn;
1646
1647 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1648 if (fn)
1649 fn->dup.ea_size = fname->dup.ea_size;
1650 }
1651
1652 /* We do not need to update parent directory later */
1653 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1654
1655 /* Step 2: Add new name in index. */
1656 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1657 if (err)
1658 goto out6;
1659
1660 /*
1661 * Call 'd_instantiate' after inode->i_op is set
1662 * but before finish_open.
1663 */
1664 d_instantiate(dentry, inode);
1665
1666 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1667 inode_set_atime_to_ts(inode, ni->i_crtime);
1668 inode_set_ctime_to_ts(inode, ni->i_crtime);
1669 inode_set_mtime_to_ts(inode, ni->i_crtime);
1670 inode_set_mtime_to_ts(dir, ni->i_crtime);
1671 inode_set_ctime_to_ts(dir, ni->i_crtime);
1672
1673 mark_inode_dirty(dir);
1674 mark_inode_dirty(inode);
1675
1676 /* Normal exit. */
1677 goto out2;
1678
1679out6:
1680 attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL);
1681 if (attr && attr->non_res) {
1682 /* Delete ATTR_EA, if non-resident. */
1683 struct runs_tree run;
1684 run_init(&run);
1685 attr_set_size(ni, ATTR_EA, NULL, 0, &run, 0, NULL, false, NULL);
1686 run_close(&run);
1687 }
1688
1689 if (rp_inserted)
1690 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1691
1692out5:
1693 if (!S_ISDIR(mode))
1694 run_deallocate(sbi, &ni->file.run, false);
1695
1696out4:
1697 clear_rec_inuse(rec);
1698 clear_nlink(inode);
1699 ni->mi.dirty = false;
1700 discard_new_inode(inode);
1701out3:
1702 ntfs_mark_rec_free(sbi, ino, false);
1703
1704out2:
1705 __putname(new_de);
1706 kfree(rp);
1707
1708out1:
1709 if (!fnd)
1710 ni_unlock(dir_ni);
1711
1712 if (!err)
1713 unlock_new_inode(inode);
1714
1715 return err;
1716}
1717
1718int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1719{
1720 int err;
1721 struct ntfs_inode *ni = ntfs_i(inode);
1722 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1723 struct NTFS_DE *de;
1724
1725 /* Allocate PATH_MAX bytes. */
1726 de = __getname();
1727 if (!de)
1728 return -ENOMEM;
1729
1730 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1731 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1732
1733 /* Construct 'de'. */
1734 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1735 if (err)
1736 goto out;
1737
1738 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1739out:
1740 __putname(de);
1741 return err;
1742}
1743
1744/*
1745 * ntfs_unlink_inode
1746 *
1747 * inode_operations::unlink
1748 * inode_operations::rmdir
1749 */
1750int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1751{
1752 int err;
1753 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1754 struct inode *inode = d_inode(dentry);
1755 struct ntfs_inode *ni = ntfs_i(inode);
1756 struct ntfs_inode *dir_ni = ntfs_i(dir);
1757 struct NTFS_DE *de, *de2 = NULL;
1758 int undo_remove;
1759
1760 if (ntfs_is_meta_file(sbi, ni->mi.rno))
1761 return -EINVAL;
1762
1763 /* Allocate PATH_MAX bytes. */
1764 de = __getname();
1765 if (!de)
1766 return -ENOMEM;
1767
1768 ni_lock(ni);
1769
1770 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1771 err = -ENOTEMPTY;
1772 goto out;
1773 }
1774
1775 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1776 if (err < 0)
1777 goto out;
1778
1779 undo_remove = 0;
1780 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1781
1782 if (!err) {
1783 drop_nlink(inode);
1784 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1785 mark_inode_dirty(dir);
1786 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1787 if (inode->i_nlink)
1788 mark_inode_dirty(inode);
1789 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1790 _ntfs_bad_inode(inode);
1791 } else {
1792 if (ni_is_dirty(dir))
1793 mark_inode_dirty(dir);
1794 if (ni_is_dirty(inode))
1795 mark_inode_dirty(inode);
1796 }
1797
1798out:
1799 ni_unlock(ni);
1800 __putname(de);
1801 return err;
1802}
1803
1804void ntfs_evict_inode(struct inode *inode)
1805{
1806 truncate_inode_pages_final(&inode->i_data);
1807
1808 invalidate_inode_buffers(inode);
1809 clear_inode(inode);
1810
1811 ni_clear(ntfs_i(inode));
1812}
1813
1814/*
1815 * ntfs_translate_junction
1816 *
1817 * Translate a Windows junction target to the Linux equivalent.
1818 * On junctions, targets are always absolute (they include the drive
1819 * letter). We have no way of knowing if the target is for the current
1820 * mounted device or not so we just assume it is.
1821 */
1822static int ntfs_translate_junction(const struct super_block *sb,
1823 const struct dentry *link_de, char *target,
1824 int target_len, int target_max)
1825{
1826 int tl_len, err = target_len;
1827 char *link_path_buffer = NULL, *link_path;
1828 char *translated = NULL;
1829 char *target_start;
1830 int copy_len;
1831
1832 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1833 if (!link_path_buffer) {
1834 err = -ENOMEM;
1835 goto out;
1836 }
1837 /* Get link path, relative to mount point */
1838 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1839 if (IS_ERR(link_path)) {
1840 ntfs_err(sb, "Error getting link path");
1841 err = -EINVAL;
1842 goto out;
1843 }
1844
1845 translated = kmalloc(PATH_MAX, GFP_NOFS);
1846 if (!translated) {
1847 err = -ENOMEM;
1848 goto out;
1849 }
1850
1851 /* Make translated path a relative path to mount point */
1852 strcpy(translated, "./");
1853 ++link_path; /* Skip leading / */
1854 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1855 if (*link_path == '/') {
1856 if (PATH_MAX - tl_len < sizeof("../")) {
1857 ntfs_err(sb,
1858 "Link path %s has too many components",
1859 link_path);
1860 err = -EINVAL;
1861 goto out;
1862 }
1863 strcpy(translated + tl_len, "../");
1864 tl_len += sizeof("../") - 1;
1865 }
1866 }
1867
1868 /* Skip drive letter */
1869 target_start = target;
1870 while (*target_start && *target_start != ':')
1871 ++target_start;
1872
1873 if (!*target_start) {
1874 ntfs_err(sb, "Link target (%s) missing drive separator",
1875 target);
1876 err = -EINVAL;
1877 goto out;
1878 }
1879
1880 /* Skip drive separator and leading /, if exists */
1881 target_start += 1 + (target_start[1] == '/');
1882 copy_len = target_len - (target_start - target);
1883
1884 if (PATH_MAX - tl_len <= copy_len) {
1885 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1886 target_start, PATH_MAX - tl_len, copy_len);
1887 err = -EINVAL;
1888 goto out;
1889 }
1890
1891 /* translated path has a trailing / and target_start does not */
1892 strcpy(translated + tl_len, target_start);
1893 tl_len += copy_len;
1894 if (target_max <= tl_len) {
1895 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1896 translated, target_max, tl_len);
1897 err = -EINVAL;
1898 goto out;
1899 }
1900 strcpy(target, translated);
1901 err = tl_len;
1902
1903out:
1904 kfree(link_path_buffer);
1905 kfree(translated);
1906 return err;
1907}
1908
1909static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1910 struct inode *inode, char *buffer,
1911 int buflen)
1912{
1913 int i, err = -EINVAL;
1914 struct ntfs_inode *ni = ntfs_i(inode);
1915 struct super_block *sb = inode->i_sb;
1916 struct ntfs_sb_info *sbi = sb->s_fs_info;
1917 u64 size;
1918 u16 ulen = 0;
1919 void *to_free = NULL;
1920 struct REPARSE_DATA_BUFFER *rp;
1921 const __le16 *uname;
1922 struct ATTRIB *attr;
1923
1924 /* Reparse data present. Try to parse it. */
1925 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1926 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1927
1928 *buffer = 0;
1929
1930 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1931 if (!attr)
1932 goto out;
1933
1934 if (!attr->non_res) {
1935 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1936 if (!rp)
1937 goto out;
1938 size = le32_to_cpu(attr->res.data_size);
1939 } else {
1940 size = le64_to_cpu(attr->nres.data_size);
1941 rp = NULL;
1942 }
1943
1944 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1945 goto out;
1946
1947 if (!rp) {
1948 rp = kmalloc(size, GFP_NOFS);
1949 if (!rp) {
1950 err = -ENOMEM;
1951 goto out;
1952 }
1953 to_free = rp;
1954 /* Read into temporal buffer. */
1955 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1956 if (err)
1957 goto out;
1958 }
1959
1960 /* Microsoft Tag. */
1961 switch (rp->ReparseTag) {
1962 case IO_REPARSE_TAG_MOUNT_POINT:
1963 /* Mount points and junctions. */
1964 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1965 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1966 MountPointReparseBuffer.PathBuffer))
1967 goto out;
1968 uname = Add2Ptr(rp,
1969 offsetof(struct REPARSE_DATA_BUFFER,
1970 MountPointReparseBuffer.PathBuffer) +
1971 le16_to_cpu(rp->MountPointReparseBuffer
1972 .PrintNameOffset));
1973 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1974 break;
1975
1976 case IO_REPARSE_TAG_SYMLINK:
1977 /* FolderSymbolicLink */
1978 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1979 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1980 SymbolicLinkReparseBuffer.PathBuffer))
1981 goto out;
1982 uname = Add2Ptr(
1983 rp, offsetof(struct REPARSE_DATA_BUFFER,
1984 SymbolicLinkReparseBuffer.PathBuffer) +
1985 le16_to_cpu(rp->SymbolicLinkReparseBuffer
1986 .PrintNameOffset));
1987 ulen = le16_to_cpu(
1988 rp->SymbolicLinkReparseBuffer.PrintNameLength);
1989 break;
1990
1991 case IO_REPARSE_TAG_CLOUD:
1992 case IO_REPARSE_TAG_CLOUD_1:
1993 case IO_REPARSE_TAG_CLOUD_2:
1994 case IO_REPARSE_TAG_CLOUD_3:
1995 case IO_REPARSE_TAG_CLOUD_4:
1996 case IO_REPARSE_TAG_CLOUD_5:
1997 case IO_REPARSE_TAG_CLOUD_6:
1998 case IO_REPARSE_TAG_CLOUD_7:
1999 case IO_REPARSE_TAG_CLOUD_8:
2000 case IO_REPARSE_TAG_CLOUD_9:
2001 case IO_REPARSE_TAG_CLOUD_A:
2002 case IO_REPARSE_TAG_CLOUD_B:
2003 case IO_REPARSE_TAG_CLOUD_C:
2004 case IO_REPARSE_TAG_CLOUD_D:
2005 case IO_REPARSE_TAG_CLOUD_E:
2006 case IO_REPARSE_TAG_CLOUD_F:
2007 err = sizeof("OneDrive") - 1;
2008 if (err > buflen)
2009 err = buflen;
2010 memcpy(buffer, "OneDrive", err);
2011 goto out;
2012
2013 default:
2014 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2015 /* Unknown Microsoft Tag. */
2016 goto out;
2017 }
2018 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2019 size <= sizeof(struct REPARSE_POINT)) {
2020 goto out;
2021 }
2022
2023 /* Users tag. */
2024 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2025 ulen = le16_to_cpu(rp->ReparseDataLength) -
2026 sizeof(struct REPARSE_POINT);
2027 }
2028
2029 /* Convert nlen from bytes to UNICODE chars. */
2030 ulen >>= 1;
2031
2032 /* Check that name is available. */
2033 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2034 goto out;
2035
2036 /* If name is already zero terminated then truncate it now. */
2037 if (!uname[ulen - 1])
2038 ulen -= 1;
2039
2040 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2041
2042 if (err < 0)
2043 goto out;
2044
2045 /* Translate Windows '\' into Linux '/'. */
2046 for (i = 0; i < err; i++) {
2047 if (buffer[i] == '\\')
2048 buffer[i] = '/';
2049 }
2050
2051 /* Always set last zero. */
2052 buffer[err] = 0;
2053
2054 /* If this is a junction, translate the link target. */
2055 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2056 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2057
2058out:
2059 kfree(to_free);
2060 return err;
2061}
2062
2063static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2064 struct delayed_call *done)
2065{
2066 int err;
2067 char *ret;
2068
2069 if (!de)
2070 return ERR_PTR(-ECHILD);
2071
2072 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2073 if (!ret)
2074 return ERR_PTR(-ENOMEM);
2075
2076 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2077 if (err < 0) {
2078 kfree(ret);
2079 return ERR_PTR(err);
2080 }
2081
2082 set_delayed_call(done, kfree_link, ret);
2083
2084 return ret;
2085}
2086
2087// clang-format off
2088const struct inode_operations ntfs_link_inode_operations = {
2089 .get_link = ntfs_get_link,
2090 .setattr = ntfs_setattr,
2091 .listxattr = ntfs_listxattr,
2092};
2093
2094const struct address_space_operations ntfs_aops = {
2095 .read_folio = ntfs_read_folio,
2096 .readahead = ntfs_readahead,
2097 .writepages = ntfs_writepages,
2098 .write_begin = ntfs_write_begin,
2099 .write_end = ntfs_write_end,
2100 .direct_IO = ntfs_direct_IO,
2101 .bmap = ntfs_bmap,
2102 .dirty_folio = block_dirty_folio,
2103 .migrate_folio = buffer_migrate_folio,
2104 .invalidate_folio = block_invalidate_folio,
2105};
2106
2107const struct address_space_operations ntfs_aops_cmpr = {
2108 .read_folio = ntfs_read_folio,
2109 .readahead = ntfs_readahead,
2110 .dirty_folio = block_dirty_folio,
2111};
2112// clang-format on