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 */
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;
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(mi: &ni->mi, sbi, rno: 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, size: MFT_REC_VOL * sbi->record_size);
61 sbi->mft.ni = ni;
62 init_rwsem(&ni->file.run_lock);
63
64 if (!run_add_entry(run: &ni->file.run, vcn: 0, lcn: t64, len: t32, is_mft: true)) {
65 err = -ENOMEM;
66 goto out;
67 }
68 }
69
70 err = mi_read(mi: &ni->mi, is_mft: 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: &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(tm: std5->cr_time, ts: &ni->i_crtime);
171#endif
172 nt2kernel(tm: std5->a_time, ts: &ts);
173 inode_set_atime_to_ts(inode, ts);
174 nt2kernel(tm: std5->c_time, ts: &ts);
175 inode_set_ctime_to_ts(inode, ts);
176 nt2kernel(tm: std5->m_time, ts: &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 fname = Add2Ptr(attr, roff);
204 if (fname->type == FILE_NAME_DOS)
205 goto next_attr;
206
207 names += 1;
208 if (name && name->len == fname->name_len &&
209 !ntfs_cmp_names_cpu(uni1: name, uni2: (struct le_str *)&fname->name_len,
210 NULL, bothcase: false))
211 is_match = true;
212
213 goto next_attr;
214
215 case ATTR_DATA:
216 if (is_dir) {
217 /* Ignore data attribute in dir record. */
218 goto next_attr;
219 }
220
221 if (ino == MFT_REC_BADCLUST && !attr->non_res)
222 goto next_attr;
223
224 if (attr->name_len &&
225 ((ino != MFT_REC_BADCLUST || !attr->non_res ||
226 attr->name_len != ARRAY_SIZE(BAD_NAME) ||
227 memcmp(p: attr_name(attr), q: BAD_NAME, size: sizeof(BAD_NAME))) &&
228 (ino != MFT_REC_SECURE || !attr->non_res ||
229 attr->name_len != ARRAY_SIZE(SDS_NAME) ||
230 memcmp(p: attr_name(attr), q: SDS_NAME, size: sizeof(SDS_NAME))))) {
231 /* File contains stream attribute. Ignore it. */
232 goto next_attr;
233 }
234
235 if (is_attr_sparsed(attr))
236 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
237 else
238 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
239
240 if (is_attr_compressed(attr))
241 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
242 else
243 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
244
245 if (is_attr_encrypted(attr))
246 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
247 else
248 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
249
250 if (!attr->non_res) {
251 ni->i_valid = inode->i_size = rsize;
252 inode_set_bytes(inode, bytes: rsize);
253 }
254
255 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
256
257 if (!attr->non_res) {
258 ni->ni_flags |= NI_FLAG_RESIDENT;
259 goto next_attr;
260 }
261
262 inode_set_bytes(inode, bytes: attr_ondisk_size(attr));
263
264 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
265 inode->i_size = le64_to_cpu(attr->nres.data_size);
266 if (!attr->nres.alloc_size)
267 goto next_attr;
268
269 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
270 &ni->file.run;
271 break;
272
273 case ATTR_ROOT:
274 if (attr->non_res)
275 goto out;
276
277 root = Add2Ptr(attr, roff);
278
279 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
280 memcmp(p: attr_name(attr), q: I30_NAME, size: sizeof(I30_NAME)))
281 goto next_attr;
282
283 if (root->type != ATTR_NAME ||
284 root->rule != NTFS_COLLATION_TYPE_FILENAME)
285 goto out;
286
287 if (!is_dir)
288 goto next_attr;
289
290 is_root = true;
291 ni->ni_flags |= NI_FLAG_DIR;
292
293 err = indx_init(indx: &ni->dir, sbi, attr, type: INDEX_MUTEX_I30);
294 if (err)
295 goto out;
296
297 mode = sb->s_root ?
298 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
299 (S_IFDIR | 0777);
300 goto next_attr;
301
302 case ATTR_ALLOC:
303 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
304 memcmp(p: attr_name(attr), q: I30_NAME, size: sizeof(I30_NAME)))
305 goto next_attr;
306
307 inode->i_size = le64_to_cpu(attr->nres.data_size);
308 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
309 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
310
311 run = &ni->dir.alloc_run;
312 break;
313
314 case ATTR_BITMAP:
315 if (ino == MFT_REC_MFT) {
316 if (!attr->non_res)
317 goto out;
318#ifndef CONFIG_NTFS3_64BIT_CLUSTER
319 /* 0x20000000 = 2^32 / 8 */
320 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
321 goto out;
322#endif
323 run = &sbi->mft.bitmap.run;
324 break;
325 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
326 !memcmp(p: attr_name(attr), q: I30_NAME,
327 size: sizeof(I30_NAME)) &&
328 attr->non_res) {
329 run = &ni->dir.bitmap_run;
330 break;
331 }
332 goto next_attr;
333
334 case ATTR_REPARSE:
335 if (attr->name_len)
336 goto next_attr;
337
338 rp_fa = ni_parse_reparse(ni, attr, buffer: &rp);
339 switch (rp_fa) {
340 case REPARSE_LINK:
341 /*
342 * Normal symlink.
343 * Assume one unicode symbol == one utf8.
344 */
345 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
346 .PrintNameLength) /
347 sizeof(u16);
348 ni->i_valid = inode->i_size;
349 /* Clear directory bit. */
350 if (ni->ni_flags & NI_FLAG_DIR) {
351 indx_clear(idx: &ni->dir);
352 memset(&ni->dir, 0, sizeof(ni->dir));
353 ni->ni_flags &= ~NI_FLAG_DIR;
354 } else {
355 run_close(run: &ni->file.run);
356 }
357 mode = S_IFLNK | 0777;
358 is_dir = false;
359 if (attr->non_res) {
360 run = &ni->file.run;
361 goto attr_unpack_run; // Double break.
362 }
363 break;
364
365 case REPARSE_COMPRESSED:
366 break;
367
368 case REPARSE_DEDUPLICATED:
369 break;
370 }
371 goto next_attr;
372
373 case ATTR_EA_INFO:
374 if (!attr->name_len &&
375 resident_data_ex(attr, datasize: sizeof(struct EA_INFO))) {
376 ni->ni_flags |= NI_FLAG_EA;
377 /*
378 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
379 */
380 inode->i_mode = mode;
381 ntfs_get_wsl_perm(inode);
382 mode = inode->i_mode;
383 }
384 goto next_attr;
385
386 default:
387 goto next_attr;
388 }
389
390attr_unpack_run:
391 roff = le16_to_cpu(attr->nres.run_off);
392
393 if (roff > asize) {
394 err = -EINVAL;
395 goto out;
396 }
397
398 t64 = le64_to_cpu(attr->nres.svcn);
399
400 err = run_unpack_ex(run, sbi, ino, svcn: t64, le64_to_cpu(attr->nres.evcn),
401 vcn: t64, Add2Ptr(attr, roff), run_buf_size: asize - roff);
402 if (err < 0)
403 goto out;
404 err = 0;
405 goto next_attr;
406
407end_enum:
408
409 if (!std5)
410 goto out;
411
412 if (!is_match && name) {
413 err = -ENOENT;
414 goto out;
415 }
416
417 if (std5->fa & FILE_ATTRIBUTE_READONLY)
418 mode &= ~0222;
419
420 if (!names) {
421 err = -EINVAL;
422 goto out;
423 }
424
425 if (names != le16_to_cpu(rec->hard_links)) {
426 /* Correct minor error on the fly. Do not mark inode as dirty. */
427 ntfs_inode_warn(inode, "Correct links count -> %u.", names);
428 rec->hard_links = cpu_to_le16(names);
429 ni->mi.dirty = true;
430 }
431
432 set_nlink(inode, nlink: names);
433
434 if (S_ISDIR(mode)) {
435 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
436
437 /*
438 * Dot and dot-dot should be included in count but was not
439 * included in enumeration.
440 * Usually a hard links to directories are disabled.
441 */
442 inode->i_op = &ntfs_dir_inode_operations;
443 inode->i_fop = &ntfs_dir_operations;
444 ni->i_valid = 0;
445 } else if (S_ISLNK(mode)) {
446 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
447 inode->i_op = &ntfs_link_inode_operations;
448 inode->i_fop = NULL;
449 inode_nohighmem(inode);
450 } else if (S_ISREG(mode)) {
451 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
452 inode->i_op = &ntfs_file_inode_operations;
453 inode->i_fop = &ntfs_file_operations;
454 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
455 &ntfs_aops;
456 if (ino != MFT_REC_MFT)
457 init_rwsem(&ni->file.run_lock);
458 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
459 S_ISSOCK(mode)) {
460 inode->i_op = &ntfs_special_inode_operations;
461 init_special_inode(inode, mode, inode->i_rdev);
462 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
463 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
464 /* Records in $Extend are not a files or general directories. */
465 inode->i_op = &ntfs_file_inode_operations;
466 } else {
467 err = -EINVAL;
468 goto out;
469 }
470
471 if ((sbi->options->sys_immutable &&
472 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
473 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
474 inode->i_flags |= S_IMMUTABLE;
475 } else {
476 inode->i_flags &= ~S_IMMUTABLE;
477 }
478
479 inode->i_mode = mode;
480 if (!(ni->ni_flags & NI_FLAG_EA)) {
481 /* If no xattr then no security (stored in xattr). */
482 inode->i_flags |= S_NOSEC;
483 }
484
485 if (ino == MFT_REC_MFT && !sb->s_root)
486 sbi->mft.ni = NULL;
487
488 unlock_new_inode(inode);
489
490 return inode;
491
492out:
493 if (ino == MFT_REC_MFT && !sb->s_root)
494 sbi->mft.ni = NULL;
495
496 iget_failed(inode);
497 return ERR_PTR(error: err);
498}
499
500/*
501 * ntfs_test_inode
502 *
503 * Return: 1 if match.
504 */
505static int ntfs_test_inode(struct inode *inode, void *data)
506{
507 struct MFT_REF *ref = data;
508
509 return ino_get(ref) == inode->i_ino;
510}
511
512static int ntfs_set_inode(struct inode *inode, void *data)
513{
514 const struct MFT_REF *ref = data;
515
516 inode->i_ino = ino_get(ref);
517 return 0;
518}
519
520struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
521 const struct cpu_str *name)
522{
523 struct inode *inode;
524
525 inode = iget5_locked(sb, ino_get(ref), test: ntfs_test_inode, set: ntfs_set_inode,
526 (void *)ref);
527 if (unlikely(!inode))
528 return ERR_PTR(error: -ENOMEM);
529
530 /* If this is a freshly allocated inode, need to read it now. */
531 if (inode->i_state & I_NEW)
532 inode = ntfs_read_mft(inode, name, ref);
533 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
534 /* Inode overlaps? */
535 _ntfs_bad_inode(inode);
536 }
537
538 if (IS_ERR(ptr: inode) && name)
539 ntfs_set_state(sbi: sb->s_fs_info, dirty: NTFS_DIRTY_ERROR);
540
541 return inode;
542}
543
544enum get_block_ctx {
545 GET_BLOCK_GENERAL = 0,
546 GET_BLOCK_WRITE_BEGIN = 1,
547 GET_BLOCK_DIRECT_IO_R = 2,
548 GET_BLOCK_DIRECT_IO_W = 3,
549 GET_BLOCK_BMAP = 4,
550};
551
552static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
553 struct buffer_head *bh, int create,
554 enum get_block_ctx ctx)
555{
556 struct super_block *sb = inode->i_sb;
557 struct ntfs_sb_info *sbi = sb->s_fs_info;
558 struct ntfs_inode *ni = ntfs_i(inode);
559 struct folio *folio = bh->b_folio;
560 u8 cluster_bits = sbi->cluster_bits;
561 u32 block_size = sb->s_blocksize;
562 u64 bytes, lbo, valid;
563 u32 off;
564 int err;
565 CLST vcn, lcn, len;
566 bool new;
567
568 /* Clear previous state. */
569 clear_buffer_new(bh);
570 clear_buffer_uptodate(bh);
571
572 if (is_resident(ni)) {
573 ni_lock(ni);
574 err = attr_data_read_resident(ni, page: &folio->page);
575 ni_unlock(ni);
576
577 if (!err)
578 set_buffer_uptodate(bh);
579 bh->b_size = block_size;
580 return err;
581 }
582
583 vcn = vbo >> cluster_bits;
584 off = vbo & sbi->cluster_mask;
585 new = false;
586
587 err = attr_data_get_block(ni, vcn, clen: 1, lcn: &lcn, len: &len, new: create ? &new : NULL,
588 zero: create && sbi->cluster_size > PAGE_SIZE);
589 if (err)
590 goto out;
591
592 if (!len)
593 return 0;
594
595 bytes = ((u64)len << cluster_bits) - off;
596
597 if (lcn == SPARSE_LCN) {
598 if (!create) {
599 if (bh->b_size > bytes)
600 bh->b_size = bytes;
601 return 0;
602 }
603 WARN_ON(1);
604 }
605
606 if (new)
607 set_buffer_new(bh);
608
609 lbo = ((u64)lcn << cluster_bits) + off;
610
611 set_buffer_mapped(bh);
612 bh->b_bdev = sb->s_bdev;
613 bh->b_blocknr = lbo >> sb->s_blocksize_bits;
614
615 valid = ni->i_valid;
616
617 if (ctx == GET_BLOCK_DIRECT_IO_W) {
618 /* ntfs_direct_IO will update ni->i_valid. */
619 if (vbo >= valid)
620 set_buffer_new(bh);
621 } else if (create) {
622 /* Normal write. */
623 if (bytes > bh->b_size)
624 bytes = bh->b_size;
625
626 if (vbo >= valid)
627 set_buffer_new(bh);
628
629 if (vbo + bytes > valid) {
630 ni->i_valid = vbo + bytes;
631 mark_inode_dirty(inode);
632 }
633 } else if (vbo >= valid) {
634 /* Read out of valid data. */
635 clear_buffer_mapped(bh);
636 } else if (vbo + bytes <= valid) {
637 /* Normal read. */
638 } else if (vbo + block_size <= valid) {
639 /* Normal short read. */
640 bytes = block_size;
641 } else {
642 /*
643 * Read across valid size: vbo < valid && valid < vbo + block_size
644 */
645 bytes = block_size;
646
647 if (folio) {
648 u32 voff = valid - vbo;
649
650 bh->b_size = block_size;
651 off = vbo & (PAGE_SIZE - 1);
652 folio_set_bh(bh, folio, offset: off);
653
654 if (bh_read(bh, op_flags: 0) < 0) {
655 err = -EIO;
656 goto out;
657 }
658 folio_zero_segment(folio, start: off + voff, xend: off + block_size);
659 }
660 }
661
662 if (bh->b_size > bytes)
663 bh->b_size = bytes;
664
665#ifndef __LP64__
666 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
667 static_assert(sizeof(size_t) < sizeof(loff_t));
668 if (bytes > 0x40000000u)
669 bh->b_size = 0x40000000u;
670 }
671#endif
672
673 return 0;
674
675out:
676 return err;
677}
678
679int ntfs_get_block(struct inode *inode, sector_t vbn,
680 struct buffer_head *bh_result, int create)
681{
682 return ntfs_get_block_vbo(inode, vbo: (u64)vbn << inode->i_blkbits,
683 bh: bh_result, create, ctx: GET_BLOCK_GENERAL);
684}
685
686static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
687 struct buffer_head *bh_result, int create)
688{
689 return ntfs_get_block_vbo(inode,
690 vbo: (u64)vsn << inode->i_sb->s_blocksize_bits,
691 bh: bh_result, create, ctx: GET_BLOCK_BMAP);
692}
693
694static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
695{
696 return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
697}
698
699static int ntfs_read_folio(struct file *file, struct folio *folio)
700{
701 struct page *page = &folio->page;
702 int err;
703 struct address_space *mapping = page->mapping;
704 struct inode *inode = mapping->host;
705 struct ntfs_inode *ni = ntfs_i(inode);
706
707 if (is_resident(ni)) {
708 ni_lock(ni);
709 err = attr_data_read_resident(ni, page);
710 ni_unlock(ni);
711 if (err != E_NTFS_NONRESIDENT) {
712 unlock_page(page);
713 return err;
714 }
715 }
716
717 if (is_compressed(ni)) {
718 ni_lock(ni);
719 err = ni_readpage_cmpr(ni, page);
720 ni_unlock(ni);
721 return err;
722 }
723
724 /* Normal + sparse files. */
725 return mpage_read_folio(folio, get_block: ntfs_get_block);
726}
727
728static void ntfs_readahead(struct readahead_control *rac)
729{
730 struct address_space *mapping = rac->mapping;
731 struct inode *inode = mapping->host;
732 struct ntfs_inode *ni = ntfs_i(inode);
733 u64 valid;
734 loff_t pos;
735
736 if (is_resident(ni)) {
737 /* No readahead for resident. */
738 return;
739 }
740
741 if (is_compressed(ni)) {
742 /* No readahead for compressed. */
743 return;
744 }
745
746 valid = ni->i_valid;
747 pos = readahead_pos(rac);
748
749 if (valid < i_size_read(inode) && pos <= valid &&
750 valid < pos + readahead_length(rac)) {
751 /* Range cross 'valid'. Read it page by page. */
752 return;
753 }
754
755 mpage_readahead(rac, get_block: ntfs_get_block);
756}
757
758static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
759 struct buffer_head *bh_result, int create)
760{
761 return ntfs_get_block_vbo(inode, vbo: (u64)iblock << inode->i_blkbits,
762 bh: bh_result, create, ctx: GET_BLOCK_DIRECT_IO_R);
763}
764
765static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
766 struct buffer_head *bh_result, int create)
767{
768 return ntfs_get_block_vbo(inode, vbo: (u64)iblock << inode->i_blkbits,
769 bh: bh_result, create, ctx: GET_BLOCK_DIRECT_IO_W);
770}
771
772static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
773{
774 struct file *file = iocb->ki_filp;
775 struct address_space *mapping = file->f_mapping;
776 struct inode *inode = mapping->host;
777 struct ntfs_inode *ni = ntfs_i(inode);
778 loff_t vbo = iocb->ki_pos;
779 loff_t end;
780 int wr = iov_iter_rw(i: iter) & WRITE;
781 size_t iter_count = iov_iter_count(i: iter);
782 loff_t valid;
783 ssize_t ret;
784
785 if (is_resident(ni)) {
786 /* Switch to buffered write. */
787 ret = 0;
788 goto out;
789 }
790
791 ret = blockdev_direct_IO(iocb, inode, iter,
792 get_block: wr ? ntfs_get_block_direct_IO_W :
793 ntfs_get_block_direct_IO_R);
794
795 if (ret > 0)
796 end = vbo + ret;
797 else if (wr && ret == -EIOCBQUEUED)
798 end = vbo + iter_count;
799 else
800 goto out;
801
802 valid = ni->i_valid;
803 if (wr) {
804 if (end > valid && !S_ISBLK(inode->i_mode)) {
805 ni->i_valid = end;
806 mark_inode_dirty(inode);
807 }
808 } else if (vbo < valid && valid < end) {
809 /* Fix page. */
810 iov_iter_revert(i: iter, bytes: end - valid);
811 iov_iter_zero(bytes: end - valid, iter);
812 }
813
814out:
815 return ret;
816}
817
818int ntfs_set_size(struct inode *inode, u64 new_size)
819{
820 struct super_block *sb = inode->i_sb;
821 struct ntfs_sb_info *sbi = sb->s_fs_info;
822 struct ntfs_inode *ni = ntfs_i(inode);
823 int err;
824
825 /* Check for maximum file size. */
826 if (is_sparsed(ni) || is_compressed(ni)) {
827 if (new_size > sbi->maxbytes_sparse) {
828 err = -EFBIG;
829 goto out;
830 }
831 } else if (new_size > sbi->maxbytes) {
832 err = -EFBIG;
833 goto out;
834 }
835
836 ni_lock(ni);
837 down_write(sem: &ni->file.run_lock);
838
839 err = attr_set_size(ni, type: ATTR_DATA, NULL, name_len: 0, run: &ni->file.run, new_size,
840 new_valid: &ni->i_valid, keep_prealloc: true, NULL);
841
842 up_write(sem: &ni->file.run_lock);
843 ni_unlock(ni);
844
845 mark_inode_dirty(inode);
846
847out:
848 return err;
849}
850
851static int ntfs_resident_writepage(struct folio *folio,
852 struct writeback_control *wbc, void *data)
853{
854 struct address_space *mapping = data;
855 struct inode *inode = mapping->host;
856 struct ntfs_inode *ni = ntfs_i(inode);
857 int ret;
858
859 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
860 return -EIO;
861
862 ni_lock(ni);
863 ret = attr_data_write_resident(ni, page: &folio->page);
864 ni_unlock(ni);
865
866 if (ret != E_NTFS_NONRESIDENT)
867 folio_unlock(folio);
868 mapping_set_error(mapping, error: ret);
869 return ret;
870}
871
872static int ntfs_writepages(struct address_space *mapping,
873 struct writeback_control *wbc)
874{
875 struct inode *inode = mapping->host;
876
877 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
878 return -EIO;
879
880 if (is_resident(ni: ntfs_i(inode)))
881 return write_cache_pages(mapping, wbc, writepage: ntfs_resident_writepage,
882 data: mapping);
883 return mpage_writepages(mapping, wbc, get_block: ntfs_get_block);
884}
885
886static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
887 struct buffer_head *bh_result, int create)
888{
889 return ntfs_get_block_vbo(inode, vbo: (u64)vbn << inode->i_blkbits,
890 bh: bh_result, create, ctx: GET_BLOCK_WRITE_BEGIN);
891}
892
893int ntfs_write_begin(struct file *file, struct address_space *mapping,
894 loff_t pos, u32 len, struct page **pagep, void **fsdata)
895{
896 int err;
897 struct inode *inode = mapping->host;
898 struct ntfs_inode *ni = ntfs_i(inode);
899
900 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
901 return -EIO;
902
903 *pagep = NULL;
904 if (is_resident(ni)) {
905 struct page *page =
906 grab_cache_page_write_begin(mapping, index: pos >> PAGE_SHIFT);
907
908 if (!page) {
909 err = -ENOMEM;
910 goto out;
911 }
912
913 ni_lock(ni);
914 err = attr_data_read_resident(ni, page);
915 ni_unlock(ni);
916
917 if (!err) {
918 *pagep = page;
919 goto out;
920 }
921 unlock_page(page);
922 put_page(page);
923
924 if (err != E_NTFS_NONRESIDENT)
925 goto out;
926 }
927
928 err = block_write_begin(mapping, pos, len, pagep,
929 get_block: ntfs_get_block_write_begin);
930
931out:
932 return err;
933}
934
935/*
936 * ntfs_write_end - Address_space_operations::write_end.
937 */
938int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
939 u32 len, u32 copied, struct page *page, void *fsdata)
940{
941 struct inode *inode = mapping->host;
942 struct ntfs_inode *ni = ntfs_i(inode);
943 u64 valid = ni->i_valid;
944 bool dirty = false;
945 int err;
946
947 if (is_resident(ni)) {
948 ni_lock(ni);
949 err = attr_data_write_resident(ni, page);
950 ni_unlock(ni);
951 if (!err) {
952 dirty = true;
953 /* Clear any buffers in page. */
954 if (page_has_buffers(page)) {
955 struct buffer_head *head, *bh;
956
957 bh = head = page_buffers(page);
958 do {
959 clear_buffer_dirty(bh);
960 clear_buffer_mapped(bh);
961 set_buffer_uptodate(bh);
962 } while (head != (bh = bh->b_this_page));
963 }
964 SetPageUptodate(page);
965 err = copied;
966 }
967 unlock_page(page);
968 put_page(page);
969 } else {
970 err = generic_write_end(file, mapping, pos, len, copied, page,
971 fsdata);
972 }
973
974 if (err >= 0) {
975 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
976 inode_set_mtime_to_ts(inode,
977 ts: inode_set_ctime_current(inode));
978 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
979 dirty = true;
980 }
981
982 if (valid != ni->i_valid) {
983 /* ni->i_valid is changed in ntfs_get_block_vbo. */
984 dirty = true;
985 }
986
987 if (pos + err > inode->i_size) {
988 i_size_write(inode, i_size: pos + err);
989 dirty = true;
990 }
991
992 if (dirty)
993 mark_inode_dirty(inode);
994 }
995
996 return err;
997}
998
999int reset_log_file(struct inode *inode)
1000{
1001 int err;
1002 loff_t pos = 0;
1003 u32 log_size = inode->i_size;
1004 struct address_space *mapping = inode->i_mapping;
1005
1006 for (;;) {
1007 u32 len;
1008 void *kaddr;
1009 struct page *page;
1010
1011 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
1012
1013 err = block_write_begin(mapping, pos, len, pagep: &page,
1014 get_block: ntfs_get_block_write_begin);
1015 if (err)
1016 goto out;
1017
1018 kaddr = kmap_atomic(page);
1019 memset(kaddr, -1, len);
1020 kunmap_atomic(kaddr);
1021 flush_dcache_page(page);
1022
1023 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
1024 if (err < 0)
1025 goto out;
1026 pos += len;
1027
1028 if (pos >= log_size)
1029 break;
1030 balance_dirty_pages_ratelimited(mapping);
1031 }
1032out:
1033 mark_inode_dirty_sync(inode);
1034
1035 return err;
1036}
1037
1038int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1039{
1040 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1041}
1042
1043int ntfs_sync_inode(struct inode *inode)
1044{
1045 return _ni_write_inode(inode, 1);
1046}
1047
1048/*
1049 * writeback_inode - Helper function for ntfs_flush_inodes().
1050 *
1051 * This writes both the inode and the file data blocks, waiting
1052 * for in flight data blocks before the start of the call. It
1053 * does not wait for any io started during the call.
1054 */
1055static int writeback_inode(struct inode *inode)
1056{
1057 int ret = sync_inode_metadata(inode, wait: 0);
1058
1059 if (!ret)
1060 ret = filemap_fdatawrite(inode->i_mapping);
1061 return ret;
1062}
1063
1064/*
1065 * ntfs_flush_inodes
1066 *
1067 * Write data and metadata corresponding to i1 and i2. The io is
1068 * started but we do not wait for any of it to finish.
1069 *
1070 * filemap_flush() is used for the block device, so if there is a dirty
1071 * page for a block already in flight, we will not wait and start the
1072 * io over again.
1073 */
1074int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1075 struct inode *i2)
1076{
1077 int ret = 0;
1078
1079 if (i1)
1080 ret = writeback_inode(inode: i1);
1081 if (!ret && i2)
1082 ret = writeback_inode(inode: i2);
1083 if (!ret)
1084 ret = sync_blockdev_nowait(bdev: sb->s_bdev);
1085 return ret;
1086}
1087
1088int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1089{
1090 pgoff_t idx;
1091
1092 /* Write non resident data. */
1093 for (idx = 0; bytes; idx++) {
1094 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1095 struct page *page = ntfs_map_page(mapping: inode->i_mapping, index: idx);
1096
1097 if (IS_ERR(ptr: page))
1098 return PTR_ERR(ptr: page);
1099
1100 lock_page(page);
1101 WARN_ON(!PageUptodate(page));
1102 ClearPageUptodate(page);
1103
1104 memcpy(page_address(page), data, op);
1105
1106 flush_dcache_page(page);
1107 SetPageUptodate(page);
1108 unlock_page(page);
1109
1110 ntfs_unmap_page(page);
1111
1112 bytes -= op;
1113 data = Add2Ptr(data, PAGE_SIZE);
1114 }
1115 return 0;
1116}
1117
1118/*
1119 * ntfs_reparse_bytes
1120 *
1121 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1122 * for unicode string of @uni_len length.
1123 */
1124static inline u32 ntfs_reparse_bytes(u32 uni_len)
1125{
1126 /* Header + unicode string + decorated unicode string. */
1127 return sizeof(short) * (2 * uni_len + 4) +
1128 offsetof(struct REPARSE_DATA_BUFFER,
1129 SymbolicLinkReparseBuffer.PathBuffer);
1130}
1131
1132static struct REPARSE_DATA_BUFFER *
1133ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1134 u32 size, u16 *nsize)
1135{
1136 int i, err;
1137 struct REPARSE_DATA_BUFFER *rp;
1138 __le16 *rp_name;
1139 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1140
1141 rp = kzalloc(size: ntfs_reparse_bytes(uni_len: 2 * size + 2), GFP_NOFS);
1142 if (!rp)
1143 return ERR_PTR(error: -ENOMEM);
1144
1145 rs = &rp->SymbolicLinkReparseBuffer;
1146 rp_name = rs->PathBuffer;
1147
1148 /* Convert link name to UTF-16. */
1149 err = ntfs_nls_to_utf16(sbi, name: symname, name_len: size,
1150 uni: (struct cpu_str *)(rp_name - 1), max_ulen: 2 * size,
1151 endian: UTF16_LITTLE_ENDIAN);
1152 if (err < 0)
1153 goto out;
1154
1155 /* err = the length of unicode name of symlink. */
1156 *nsize = ntfs_reparse_bytes(uni_len: err);
1157
1158 if (*nsize > sbi->reparse.max_size) {
1159 err = -EFBIG;
1160 goto out;
1161 }
1162
1163 /* Translate Linux '/' into Windows '\'. */
1164 for (i = 0; i < err; i++) {
1165 if (rp_name[i] == cpu_to_le16('/'))
1166 rp_name[i] = cpu_to_le16('\\');
1167 }
1168
1169 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1170 rp->ReparseDataLength =
1171 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1172 SymbolicLinkReparseBuffer));
1173
1174 /* PrintName + SubstituteName. */
1175 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1176 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1177 rs->PrintNameLength = rs->SubstituteNameOffset;
1178
1179 /*
1180 * TODO: Use relative path if possible to allow Windows to
1181 * parse this path.
1182 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1183 */
1184 rs->Flags = 0;
1185
1186 memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1187
1188 /* Decorate SubstituteName. */
1189 rp_name += err;
1190 rp_name[0] = cpu_to_le16('\\');
1191 rp_name[1] = cpu_to_le16('?');
1192 rp_name[2] = cpu_to_le16('?');
1193 rp_name[3] = cpu_to_le16('\\');
1194
1195 return rp;
1196out:
1197 kfree(objp: rp);
1198 return ERR_PTR(error: err);
1199}
1200
1201/*
1202 * ntfs_create_inode
1203 *
1204 * Helper function for:
1205 * - ntfs_create
1206 * - ntfs_mknod
1207 * - ntfs_symlink
1208 * - ntfs_mkdir
1209 * - ntfs_atomic_open
1210 *
1211 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1212 */
1213struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1214 struct dentry *dentry,
1215 const struct cpu_str *uni, umode_t mode,
1216 dev_t dev, const char *symname, u32 size,
1217 struct ntfs_fnd *fnd)
1218{
1219 int err;
1220 struct super_block *sb = dir->i_sb;
1221 struct ntfs_sb_info *sbi = sb->s_fs_info;
1222 const struct qstr *name = &dentry->d_name;
1223 CLST ino = 0;
1224 struct ntfs_inode *dir_ni = ntfs_i(inode: dir);
1225 struct ntfs_inode *ni = NULL;
1226 struct inode *inode = NULL;
1227 struct ATTRIB *attr;
1228 struct ATTR_STD_INFO5 *std5;
1229 struct ATTR_FILE_NAME *fname;
1230 struct MFT_REC *rec;
1231 u32 asize, dsize, sd_size;
1232 enum FILE_ATTRIBUTE fa;
1233 __le32 security_id = SECURITY_ID_INVALID;
1234 CLST vcn;
1235 const void *sd;
1236 u16 t16, nsize = 0, aid = 0;
1237 struct INDEX_ROOT *root, *dir_root;
1238 struct NTFS_DE *e, *new_de = NULL;
1239 struct REPARSE_DATA_BUFFER *rp = NULL;
1240 bool rp_inserted = false;
1241
1242 if (!fnd)
1243 ni_lock_dir(ni: dir_ni);
1244
1245 dir_root = indx_get_root(indx: &dir_ni->dir, ni: dir_ni, NULL, NULL);
1246 if (!dir_root) {
1247 err = -EINVAL;
1248 goto out1;
1249 }
1250
1251 if (S_ISDIR(mode)) {
1252 /* Use parent's directory attributes. */
1253 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1254 FILE_ATTRIBUTE_ARCHIVE;
1255 /*
1256 * By default child directory inherits parent attributes.
1257 * Root directory is hidden + system.
1258 * Make an exception for children in root.
1259 */
1260 if (dir->i_ino == MFT_REC_ROOT)
1261 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1262 } else if (S_ISLNK(mode)) {
1263 /* It is good idea that link should be the same type (file/dir) as target */
1264 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1265
1266 /*
1267 * Linux: there are dir/file/symlink and so on.
1268 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1269 * It is good idea to create:
1270 * dir + reparse if 'symname' points to directory
1271 * or
1272 * file + reparse if 'symname' points to file
1273 * Unfortunately kern_path hangs if symname contains 'dir'.
1274 */
1275
1276 /*
1277 * struct path path;
1278 *
1279 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1280 * struct inode *target = d_inode(path.dentry);
1281 *
1282 * if (S_ISDIR(target->i_mode))
1283 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1284 * // if ( target->i_sb == sb ){
1285 * // use relative path?
1286 * // }
1287 * path_put(&path);
1288 * }
1289 */
1290 } else if (S_ISREG(mode)) {
1291 if (sbi->options->sparse) {
1292 /* Sparsed regular file, cause option 'sparse'. */
1293 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1294 FILE_ATTRIBUTE_ARCHIVE;
1295 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1296 /* Compressed regular file, if parent is compressed. */
1297 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1298 } else {
1299 /* Regular file, default attributes. */
1300 fa = FILE_ATTRIBUTE_ARCHIVE;
1301 }
1302 } else {
1303 fa = FILE_ATTRIBUTE_ARCHIVE;
1304 }
1305
1306 /* If option "hide_dot_files" then set hidden attribute for dot files. */
1307 if (sbi->options->hide_dot_files && name->name[0] == '.')
1308 fa |= FILE_ATTRIBUTE_HIDDEN;
1309
1310 if (!(mode & 0222))
1311 fa |= FILE_ATTRIBUTE_READONLY;
1312
1313 /* Allocate PATH_MAX bytes. */
1314 new_de = __getname();
1315 if (!new_de) {
1316 err = -ENOMEM;
1317 goto out1;
1318 }
1319
1320 if (unlikely(ntfs3_forced_shutdown(sb))) {
1321 err = -EIO;
1322 goto out2;
1323 }
1324
1325 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1326 ntfs_set_state(sbi, dirty: NTFS_DIRTY_DIRTY);
1327
1328 /* Step 1: allocate and fill new mft record. */
1329 err = ntfs_look_free_mft(sbi, rno: &ino, mft: false, NULL, NULL);
1330 if (err)
1331 goto out2;
1332
1333 ni = ntfs_new_inode(sbi, nRec: ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1334 if (IS_ERR(ptr: ni)) {
1335 err = PTR_ERR(ptr: ni);
1336 ni = NULL;
1337 goto out3;
1338 }
1339 inode = &ni->vfs_inode;
1340 inode_init_owner(idmap, inode, dir, mode);
1341 mode = inode->i_mode;
1342
1343 ni->i_crtime = current_time(inode);
1344
1345 rec = ni->mi.mrec;
1346 rec->hard_links = cpu_to_le16(1);
1347 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1348
1349 /* Get default security id. */
1350 sd = s_default_security;
1351 sd_size = sizeof(s_default_security);
1352
1353 if (is_ntfs3(sbi)) {
1354 security_id = dir_ni->std_security_id;
1355 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1356 security_id = sbi->security.def_security_id;
1357
1358 if (security_id == SECURITY_ID_INVALID &&
1359 !ntfs_insert_security(sbi, sd, size: sd_size,
1360 security_id: &security_id, NULL))
1361 sbi->security.def_security_id = security_id;
1362 }
1363 }
1364
1365 /* Insert standard info. */
1366 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1367
1368 if (security_id == SECURITY_ID_INVALID) {
1369 dsize = sizeof(struct ATTR_STD_INFO);
1370 } else {
1371 dsize = sizeof(struct ATTR_STD_INFO5);
1372 std5->security_id = security_id;
1373 ni->std_security_id = security_id;
1374 }
1375 asize = SIZEOF_RESIDENT + dsize;
1376
1377 attr->type = ATTR_STD;
1378 attr->size = cpu_to_le32(asize);
1379 attr->id = cpu_to_le16(aid++);
1380 attr->res.data_off = SIZEOF_RESIDENT_LE;
1381 attr->res.data_size = cpu_to_le32(dsize);
1382
1383 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1384 kernel2nt(ts: &ni->i_crtime);
1385
1386 std5->fa = ni->std_fa = fa;
1387
1388 attr = Add2Ptr(attr, asize);
1389
1390 /* Insert file name. */
1391 err = fill_name_de(sbi, buf: new_de, name, uni);
1392 if (err)
1393 goto out4;
1394
1395 mi_get_ref(mi: &ni->mi, ref: &new_de->ref);
1396
1397 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1398
1399 if (sbi->options->windows_names &&
1400 !valid_windows_name(sbi, name: (struct le_str *)&fname->name_len)) {
1401 err = -EINVAL;
1402 goto out4;
1403 }
1404
1405 mi_get_ref(mi: &dir_ni->mi, ref: &fname->home);
1406 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1407 fname->dup.a_time = std5->cr_time;
1408 fname->dup.alloc_size = fname->dup.data_size = 0;
1409 fname->dup.fa = std5->fa;
1410 fname->dup.ea_size = fname->dup.reparse = 0;
1411
1412 dsize = le16_to_cpu(new_de->key_size);
1413 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1414
1415 attr->type = ATTR_NAME;
1416 attr->size = cpu_to_le32(asize);
1417 attr->res.data_off = SIZEOF_RESIDENT_LE;
1418 attr->res.flags = RESIDENT_FLAG_INDEXED;
1419 attr->id = cpu_to_le16(aid++);
1420 attr->res.data_size = cpu_to_le32(dsize);
1421 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1422
1423 attr = Add2Ptr(attr, asize);
1424
1425 if (security_id == SECURITY_ID_INVALID) {
1426 /* Insert security attribute. */
1427 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1428
1429 attr->type = ATTR_SECURE;
1430 attr->size = cpu_to_le32(asize);
1431 attr->id = cpu_to_le16(aid++);
1432 attr->res.data_off = SIZEOF_RESIDENT_LE;
1433 attr->res.data_size = cpu_to_le32(sd_size);
1434 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1435
1436 attr = Add2Ptr(attr, asize);
1437 }
1438
1439 attr->id = cpu_to_le16(aid++);
1440 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1441 /*
1442 * Regular directory or symlink to directory.
1443 * Create root attribute.
1444 */
1445 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1446 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1447
1448 attr->type = ATTR_ROOT;
1449 attr->size = cpu_to_le32(asize);
1450
1451 attr->name_len = ARRAY_SIZE(I30_NAME);
1452 attr->name_off = SIZEOF_RESIDENT_LE;
1453 attr->res.data_off =
1454 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1455 attr->res.data_size = cpu_to_le32(dsize);
1456 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1457 sizeof(I30_NAME));
1458
1459 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1460 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1461 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1462 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1463 sizeof(struct NTFS_DE));
1464 root->ihdr.total = root->ihdr.used;
1465
1466 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1467 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1468 e->flags = NTFS_IE_LAST;
1469 } else if (S_ISLNK(mode)) {
1470 /*
1471 * Symlink to file.
1472 * Create empty resident data attribute.
1473 */
1474 asize = SIZEOF_RESIDENT;
1475
1476 /* Insert empty ATTR_DATA */
1477 attr->type = ATTR_DATA;
1478 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1479 attr->name_off = SIZEOF_RESIDENT_LE;
1480 attr->res.data_off = SIZEOF_RESIDENT_LE;
1481 } else if (S_ISREG(mode)) {
1482 /*
1483 * Regular file. Create empty non resident data attribute.
1484 */
1485 attr->type = ATTR_DATA;
1486 attr->non_res = 1;
1487 attr->nres.evcn = cpu_to_le64(-1ll);
1488 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1489 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1490 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1491 attr->flags = ATTR_FLAG_SPARSED;
1492 asize = SIZEOF_NONRESIDENT_EX + 8;
1493 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1494 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1495 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1496 attr->flags = ATTR_FLAG_COMPRESSED;
1497 attr->nres.c_unit = COMPRESSION_UNIT;
1498 asize = SIZEOF_NONRESIDENT_EX + 8;
1499 } else {
1500 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1501 attr->name_off = SIZEOF_NONRESIDENT_LE;
1502 asize = SIZEOF_NONRESIDENT + 8;
1503 }
1504 attr->nres.run_off = attr->name_off;
1505 } else {
1506 /*
1507 * Node. Create empty resident data attribute.
1508 */
1509 attr->type = ATTR_DATA;
1510 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1511 attr->name_off = SIZEOF_RESIDENT_LE;
1512 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1513 attr->flags = ATTR_FLAG_SPARSED;
1514 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1515 attr->flags = ATTR_FLAG_COMPRESSED;
1516 attr->res.data_off = SIZEOF_RESIDENT_LE;
1517 asize = SIZEOF_RESIDENT;
1518 ni->ni_flags |= NI_FLAG_RESIDENT;
1519 }
1520
1521 if (S_ISDIR(mode)) {
1522 ni->ni_flags |= NI_FLAG_DIR;
1523 err = indx_init(indx: &ni->dir, sbi, attr, type: INDEX_MUTEX_I30);
1524 if (err)
1525 goto out4;
1526 } else if (S_ISLNK(mode)) {
1527 rp = ntfs_create_reparse_buffer(sbi, symname, size, nsize: &nsize);
1528
1529 if (IS_ERR(ptr: rp)) {
1530 err = PTR_ERR(ptr: rp);
1531 rp = NULL;
1532 goto out4;
1533 }
1534
1535 /*
1536 * Insert ATTR_REPARSE.
1537 */
1538 attr = Add2Ptr(attr, asize);
1539 attr->type = ATTR_REPARSE;
1540 attr->id = cpu_to_le16(aid++);
1541
1542 /* Resident or non resident? */
1543 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1544 t16 = PtrOffset(rec, attr);
1545
1546 /*
1547 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1548 * It is good idea to keep extened attributes resident.
1549 */
1550 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1551 CLST alen;
1552 CLST clst = bytes_to_cluster(sbi, size: nsize);
1553
1554 /* Bytes per runs. */
1555 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1556
1557 attr->non_res = 1;
1558 attr->nres.evcn = cpu_to_le64(clst - 1);
1559 attr->name_off = SIZEOF_NONRESIDENT_LE;
1560 attr->nres.run_off = attr->name_off;
1561 attr->nres.data_size = cpu_to_le64(nsize);
1562 attr->nres.valid_size = attr->nres.data_size;
1563 attr->nres.alloc_size =
1564 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1565
1566 err = attr_allocate_clusters(sbi, run: &ni->file.run, vcn: 0, lcn: 0,
1567 len: clst, NULL, opt: ALLOCATE_DEF,
1568 alen: &alen, fr: 0, NULL, NULL);
1569 if (err)
1570 goto out5;
1571
1572 err = run_pack(run: &ni->file.run, svcn: 0, len: clst,
1573 Add2Ptr(attr, SIZEOF_NONRESIDENT), run_buf_size: t16,
1574 packed_vcns: &vcn);
1575 if (err < 0)
1576 goto out5;
1577
1578 if (vcn != clst) {
1579 err = -EINVAL;
1580 goto out5;
1581 }
1582
1583 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1584 /* Write non resident data. */
1585 err = ntfs_sb_write_run(sbi, run: &ni->file.run, vbo: 0, buf: rp,
1586 bytes: nsize, sync: 0);
1587 if (err)
1588 goto out5;
1589 } else {
1590 attr->res.data_off = SIZEOF_RESIDENT_LE;
1591 attr->res.data_size = cpu_to_le32(nsize);
1592 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1593 }
1594 /* Size of symlink equals the length of input string. */
1595 inode->i_size = size;
1596
1597 attr->size = cpu_to_le32(asize);
1598
1599 err = ntfs_insert_reparse(sbi, rtag: IO_REPARSE_TAG_SYMLINK,
1600 ref: &new_de->ref);
1601 if (err)
1602 goto out5;
1603
1604 rp_inserted = true;
1605 }
1606
1607 attr = Add2Ptr(attr, asize);
1608 attr->type = ATTR_END;
1609
1610 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1611 rec->next_attr_id = cpu_to_le16(aid);
1612
1613 inode->i_generation = le16_to_cpu(rec->seq);
1614
1615 if (S_ISDIR(mode)) {
1616 inode->i_op = &ntfs_dir_inode_operations;
1617 inode->i_fop = &ntfs_dir_operations;
1618 } else if (S_ISLNK(mode)) {
1619 inode->i_op = &ntfs_link_inode_operations;
1620 inode->i_fop = NULL;
1621 inode->i_mapping->a_ops = &ntfs_aops;
1622 inode->i_size = size;
1623 inode_nohighmem(inode);
1624 } else if (S_ISREG(mode)) {
1625 inode->i_op = &ntfs_file_inode_operations;
1626 inode->i_fop = &ntfs_file_operations;
1627 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1628 &ntfs_aops;
1629 init_rwsem(&ni->file.run_lock);
1630 } else {
1631 inode->i_op = &ntfs_special_inode_operations;
1632 init_special_inode(inode, mode, dev);
1633 }
1634
1635#ifdef CONFIG_NTFS3_FS_POSIX_ACL
1636 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1637 err = ntfs_init_acl(idmap, inode, dir);
1638 if (err)
1639 goto out5;
1640 } else
1641#endif
1642 {
1643 inode->i_flags |= S_NOSEC;
1644 }
1645
1646 /*
1647 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1648 * The packed size of extended attribute is stored in direntry too.
1649 * 'fname' here points to inside new_de.
1650 */
1651 ntfs_save_wsl_perm(inode, ea_size: &fname->dup.ea_size);
1652
1653 /*
1654 * update ea_size in file_name attribute too.
1655 * Use ni_find_attr cause layout of MFT record may be changed
1656 * in ntfs_init_acl and ntfs_save_wsl_perm.
1657 */
1658 attr = ni_find_attr(ni, NULL, NULL, type: ATTR_NAME, NULL, name_len: 0, NULL, NULL);
1659 if (attr) {
1660 struct ATTR_FILE_NAME *fn;
1661
1662 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1663 if (fn)
1664 fn->dup.ea_size = fname->dup.ea_size;
1665 }
1666
1667 /* We do not need to update parent directory later */
1668 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1669
1670 /* Step 2: Add new name in index. */
1671 err = indx_insert_entry(indx: &dir_ni->dir, ni: dir_ni, new_de, param: sbi, fnd, undo: 0);
1672 if (err)
1673 goto out6;
1674
1675 /*
1676 * Call 'd_instantiate' after inode->i_op is set
1677 * but before finish_open.
1678 */
1679 d_instantiate(dentry, inode);
1680
1681 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1682 inode_set_atime_to_ts(inode, ts: ni->i_crtime);
1683 inode_set_ctime_to_ts(inode, ts: ni->i_crtime);
1684 inode_set_mtime_to_ts(inode, ts: ni->i_crtime);
1685 inode_set_mtime_to_ts(inode: dir, ts: ni->i_crtime);
1686 inode_set_ctime_to_ts(inode: dir, ts: ni->i_crtime);
1687
1688 mark_inode_dirty(inode: dir);
1689 mark_inode_dirty(inode);
1690
1691 /* Normal exit. */
1692 goto out2;
1693
1694out6:
1695 if (rp_inserted)
1696 ntfs_remove_reparse(sbi, rtag: IO_REPARSE_TAG_SYMLINK, ref: &new_de->ref);
1697
1698out5:
1699 if (!S_ISDIR(mode))
1700 run_deallocate(sbi, run: &ni->file.run, trim: false);
1701
1702out4:
1703 clear_rec_inuse(rec);
1704 clear_nlink(inode);
1705 ni->mi.dirty = false;
1706 discard_new_inode(inode);
1707out3:
1708 ntfs_mark_rec_free(sbi, rno: ino, is_mft: false);
1709
1710out2:
1711 __putname(new_de);
1712 kfree(objp: rp);
1713
1714out1:
1715 if (!fnd)
1716 ni_unlock(ni: dir_ni);
1717
1718 if (err)
1719 return ERR_PTR(error: err);
1720
1721 unlock_new_inode(inode);
1722
1723 return inode;
1724}
1725
1726int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1727{
1728 int err;
1729 struct ntfs_inode *ni = ntfs_i(inode);
1730 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1731 struct NTFS_DE *de;
1732
1733 /* Allocate PATH_MAX bytes. */
1734 de = __getname();
1735 if (!de)
1736 return -ENOMEM;
1737
1738 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1739 ntfs_set_state(sbi, dirty: NTFS_DIRTY_DIRTY);
1740
1741 /* Construct 'de'. */
1742 err = fill_name_de(sbi, buf: de, name: &dentry->d_name, NULL);
1743 if (err)
1744 goto out;
1745
1746 err = ni_add_name(dir_ni: ntfs_i(inode: d_inode(dentry: dentry->d_parent)), ni, de);
1747out:
1748 __putname(de);
1749 return err;
1750}
1751
1752/*
1753 * ntfs_unlink_inode
1754 *
1755 * inode_operations::unlink
1756 * inode_operations::rmdir
1757 */
1758int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1759{
1760 int err;
1761 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1762 struct inode *inode = d_inode(dentry);
1763 struct ntfs_inode *ni = ntfs_i(inode);
1764 struct ntfs_inode *dir_ni = ntfs_i(inode: dir);
1765 struct NTFS_DE *de, *de2 = NULL;
1766 int undo_remove;
1767
1768 if (ntfs_is_meta_file(sbi, rno: ni->mi.rno))
1769 return -EINVAL;
1770
1771 /* Allocate PATH_MAX bytes. */
1772 de = __getname();
1773 if (!de)
1774 return -ENOMEM;
1775
1776 ni_lock(ni);
1777
1778 if (S_ISDIR(inode->i_mode) && !dir_is_empty(dir: inode)) {
1779 err = -ENOTEMPTY;
1780 goto out;
1781 }
1782
1783 err = fill_name_de(sbi, buf: de, name: &dentry->d_name, NULL);
1784 if (err < 0)
1785 goto out;
1786
1787 undo_remove = 0;
1788 err = ni_remove_name(dir_ni, ni, de, de2: &de2, undo_step: &undo_remove);
1789
1790 if (!err) {
1791 drop_nlink(inode);
1792 inode_set_mtime_to_ts(inode: dir, ts: inode_set_ctime_current(inode: dir));
1793 mark_inode_dirty(inode: dir);
1794 inode_set_ctime_to_ts(inode, ts: inode_get_ctime(inode: dir));
1795 if (inode->i_nlink)
1796 mark_inode_dirty(inode);
1797 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_step: undo_remove)) {
1798 _ntfs_bad_inode(inode);
1799 } else {
1800 if (ni_is_dirty(inode: dir))
1801 mark_inode_dirty(inode: dir);
1802 if (ni_is_dirty(inode))
1803 mark_inode_dirty(inode);
1804 }
1805
1806out:
1807 ni_unlock(ni);
1808 __putname(de);
1809 return err;
1810}
1811
1812void ntfs_evict_inode(struct inode *inode)
1813{
1814 truncate_inode_pages_final(&inode->i_data);
1815
1816 invalidate_inode_buffers(inode);
1817 clear_inode(inode);
1818
1819 ni_clear(ni: ntfs_i(inode));
1820}
1821
1822/*
1823 * ntfs_translate_junction
1824 *
1825 * Translate a Windows junction target to the Linux equivalent.
1826 * On junctions, targets are always absolute (they include the drive
1827 * letter). We have no way of knowing if the target is for the current
1828 * mounted device or not so we just assume it is.
1829 */
1830static int ntfs_translate_junction(const struct super_block *sb,
1831 const struct dentry *link_de, char *target,
1832 int target_len, int target_max)
1833{
1834 int tl_len, err = target_len;
1835 char *link_path_buffer = NULL, *link_path;
1836 char *translated = NULL;
1837 char *target_start;
1838 int copy_len;
1839
1840 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1841 if (!link_path_buffer) {
1842 err = -ENOMEM;
1843 goto out;
1844 }
1845 /* Get link path, relative to mount point */
1846 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1847 if (IS_ERR(ptr: link_path)) {
1848 ntfs_err(sb, "Error getting link path");
1849 err = -EINVAL;
1850 goto out;
1851 }
1852
1853 translated = kmalloc(PATH_MAX, GFP_NOFS);
1854 if (!translated) {
1855 err = -ENOMEM;
1856 goto out;
1857 }
1858
1859 /* Make translated path a relative path to mount point */
1860 strcpy(p: translated, q: "./");
1861 ++link_path; /* Skip leading / */
1862 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1863 if (*link_path == '/') {
1864 if (PATH_MAX - tl_len < sizeof("../")) {
1865 ntfs_err(sb,
1866 "Link path %s has too many components",
1867 link_path);
1868 err = -EINVAL;
1869 goto out;
1870 }
1871 strcpy(p: translated + tl_len, q: "../");
1872 tl_len += sizeof("../") - 1;
1873 }
1874 }
1875
1876 /* Skip drive letter */
1877 target_start = target;
1878 while (*target_start && *target_start != ':')
1879 ++target_start;
1880
1881 if (!*target_start) {
1882 ntfs_err(sb, "Link target (%s) missing drive separator",
1883 target);
1884 err = -EINVAL;
1885 goto out;
1886 }
1887
1888 /* Skip drive separator and leading /, if exists */
1889 target_start += 1 + (target_start[1] == '/');
1890 copy_len = target_len - (target_start - target);
1891
1892 if (PATH_MAX - tl_len <= copy_len) {
1893 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1894 target_start, PATH_MAX - tl_len, copy_len);
1895 err = -EINVAL;
1896 goto out;
1897 }
1898
1899 /* translated path has a trailing / and target_start does not */
1900 strcpy(p: translated + tl_len, q: target_start);
1901 tl_len += copy_len;
1902 if (target_max <= tl_len) {
1903 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1904 translated, target_max, tl_len);
1905 err = -EINVAL;
1906 goto out;
1907 }
1908 strcpy(p: target, q: translated);
1909 err = tl_len;
1910
1911out:
1912 kfree(objp: link_path_buffer);
1913 kfree(objp: translated);
1914 return err;
1915}
1916
1917static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1918 struct inode *inode, char *buffer,
1919 int buflen)
1920{
1921 int i, err = -EINVAL;
1922 struct ntfs_inode *ni = ntfs_i(inode);
1923 struct super_block *sb = inode->i_sb;
1924 struct ntfs_sb_info *sbi = sb->s_fs_info;
1925 u64 size;
1926 u16 ulen = 0;
1927 void *to_free = NULL;
1928 struct REPARSE_DATA_BUFFER *rp;
1929 const __le16 *uname;
1930 struct ATTRIB *attr;
1931
1932 /* Reparse data present. Try to parse it. */
1933 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1934 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1935
1936 *buffer = 0;
1937
1938 attr = ni_find_attr(ni, NULL, NULL, type: ATTR_REPARSE, NULL, name_len: 0, NULL, NULL);
1939 if (!attr)
1940 goto out;
1941
1942 if (!attr->non_res) {
1943 rp = resident_data_ex(attr, datasize: sizeof(struct REPARSE_DATA_BUFFER));
1944 if (!rp)
1945 goto out;
1946 size = le32_to_cpu(attr->res.data_size);
1947 } else {
1948 size = le64_to_cpu(attr->nres.data_size);
1949 rp = NULL;
1950 }
1951
1952 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1953 goto out;
1954
1955 if (!rp) {
1956 rp = kmalloc(size, GFP_NOFS);
1957 if (!rp) {
1958 err = -ENOMEM;
1959 goto out;
1960 }
1961 to_free = rp;
1962 /* Read into temporal buffer. */
1963 err = ntfs_read_run_nb(sbi, run: &ni->file.run, vbo: 0, buf: rp, bytes: size, NULL);
1964 if (err)
1965 goto out;
1966 }
1967
1968 /* Microsoft Tag. */
1969 switch (rp->ReparseTag) {
1970 case IO_REPARSE_TAG_MOUNT_POINT:
1971 /* Mount points and junctions. */
1972 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1973 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1974 MountPointReparseBuffer.PathBuffer))
1975 goto out;
1976 uname = Add2Ptr(rp,
1977 offsetof(struct REPARSE_DATA_BUFFER,
1978 MountPointReparseBuffer.PathBuffer) +
1979 le16_to_cpu(rp->MountPointReparseBuffer
1980 .PrintNameOffset));
1981 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1982 break;
1983
1984 case IO_REPARSE_TAG_SYMLINK:
1985 /* FolderSymbolicLink */
1986 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1987 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1988 SymbolicLinkReparseBuffer.PathBuffer))
1989 goto out;
1990 uname = Add2Ptr(
1991 rp, offsetof(struct REPARSE_DATA_BUFFER,
1992 SymbolicLinkReparseBuffer.PathBuffer) +
1993 le16_to_cpu(rp->SymbolicLinkReparseBuffer
1994 .PrintNameOffset));
1995 ulen = le16_to_cpu(
1996 rp->SymbolicLinkReparseBuffer.PrintNameLength);
1997 break;
1998
1999 case IO_REPARSE_TAG_CLOUD:
2000 case IO_REPARSE_TAG_CLOUD_1:
2001 case IO_REPARSE_TAG_CLOUD_2:
2002 case IO_REPARSE_TAG_CLOUD_3:
2003 case IO_REPARSE_TAG_CLOUD_4:
2004 case IO_REPARSE_TAG_CLOUD_5:
2005 case IO_REPARSE_TAG_CLOUD_6:
2006 case IO_REPARSE_TAG_CLOUD_7:
2007 case IO_REPARSE_TAG_CLOUD_8:
2008 case IO_REPARSE_TAG_CLOUD_9:
2009 case IO_REPARSE_TAG_CLOUD_A:
2010 case IO_REPARSE_TAG_CLOUD_B:
2011 case IO_REPARSE_TAG_CLOUD_C:
2012 case IO_REPARSE_TAG_CLOUD_D:
2013 case IO_REPARSE_TAG_CLOUD_E:
2014 case IO_REPARSE_TAG_CLOUD_F:
2015 err = sizeof("OneDrive") - 1;
2016 if (err > buflen)
2017 err = buflen;
2018 memcpy(buffer, "OneDrive", err);
2019 goto out;
2020
2021 default:
2022 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2023 /* Unknown Microsoft Tag. */
2024 goto out;
2025 }
2026 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2027 size <= sizeof(struct REPARSE_POINT)) {
2028 goto out;
2029 }
2030
2031 /* Users tag. */
2032 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2033 ulen = le16_to_cpu(rp->ReparseDataLength) -
2034 sizeof(struct REPARSE_POINT);
2035 }
2036
2037 /* Convert nlen from bytes to UNICODE chars. */
2038 ulen >>= 1;
2039
2040 /* Check that name is available. */
2041 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2042 goto out;
2043
2044 /* If name is already zero terminated then truncate it now. */
2045 if (!uname[ulen - 1])
2046 ulen -= 1;
2047
2048 err = ntfs_utf16_to_nls(sbi, name: uname, len: ulen, buf: buffer, buf_len: buflen);
2049
2050 if (err < 0)
2051 goto out;
2052
2053 /* Translate Windows '\' into Linux '/'. */
2054 for (i = 0; i < err; i++) {
2055 if (buffer[i] == '\\')
2056 buffer[i] = '/';
2057 }
2058
2059 /* Always set last zero. */
2060 buffer[err] = 0;
2061
2062 /* If this is a junction, translate the link target. */
2063 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2064 err = ntfs_translate_junction(sb, link_de, target: buffer, target_len: err, target_max: buflen);
2065
2066out:
2067 kfree(objp: to_free);
2068 return err;
2069}
2070
2071static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2072 struct delayed_call *done)
2073{
2074 int err;
2075 char *ret;
2076
2077 if (!de)
2078 return ERR_PTR(error: -ECHILD);
2079
2080 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2081 if (!ret)
2082 return ERR_PTR(error: -ENOMEM);
2083
2084 err = ntfs_readlink_hlp(link_de: de, inode, buffer: ret, PAGE_SIZE);
2085 if (err < 0) {
2086 kfree(objp: ret);
2087 return ERR_PTR(error: err);
2088 }
2089
2090 set_delayed_call(call: done, fn: kfree_link, arg: ret);
2091
2092 return ret;
2093}
2094
2095// clang-format off
2096const struct inode_operations ntfs_link_inode_operations = {
2097 .get_link = ntfs_get_link,
2098 .setattr = ntfs3_setattr,
2099 .listxattr = ntfs_listxattr,
2100};
2101
2102const struct address_space_operations ntfs_aops = {
2103 .read_folio = ntfs_read_folio,
2104 .readahead = ntfs_readahead,
2105 .writepages = ntfs_writepages,
2106 .write_begin = ntfs_write_begin,
2107 .write_end = ntfs_write_end,
2108 .direct_IO = ntfs_direct_IO,
2109 .bmap = ntfs_bmap,
2110 .dirty_folio = block_dirty_folio,
2111 .migrate_folio = buffer_migrate_folio,
2112 .invalidate_folio = block_invalidate_folio,
2113};
2114
2115const struct address_space_operations ntfs_aops_cmpr = {
2116 .read_folio = ntfs_read_folio,
2117 .readahead = ntfs_readahead,
2118};
2119// clang-format on
2120

source code of linux/fs/ntfs3/inode.c