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 */
ntfs_read_mft(struct inode * inode,const struct cpu_str * name,const struct MFT_REF * ref)23 static struct inode *ntfs_read_mft(struct inode *inode,
24 const struct cpu_str *name,
25 const struct MFT_REF *ref)
26 {
27 int err = 0;
28 struct ntfs_inode *ni = ntfs_i(inode);
29 struct super_block *sb = inode->i_sb;
30 struct ntfs_sb_info *sbi = sb->s_fs_info;
31 mode_t mode = 0;
32 struct ATTR_STD_INFO5 *std5 = NULL;
33 struct ATTR_LIST_ENTRY *le;
34 struct ATTRIB *attr;
35 bool is_match = false;
36 bool is_root = false;
37 bool is_dir;
38 unsigned long ino = inode->i_ino;
39 u32 rp_fa = 0, asize, t32;
40 u16 roff, rsize, names = 0, 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 */
120 next_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
391 attr_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
408 end_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 mode = S_IFREG;
475 } else {
476 err = -EINVAL;
477 goto out;
478 }
479
480 if ((sbi->options->sys_immutable &&
481 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
482 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
483 inode->i_flags |= S_IMMUTABLE;
484 } else {
485 inode->i_flags &= ~S_IMMUTABLE;
486 }
487
488 inode->i_mode = mode;
489 if (!(ni->ni_flags & NI_FLAG_EA)) {
490 /* If no xattr then no security (stored in xattr). */
491 inode->i_flags |= S_NOSEC;
492 }
493
494 if (ino == MFT_REC_MFT && !sb->s_root)
495 sbi->mft.ni = NULL;
496
497 unlock_new_inode(inode);
498
499 return inode;
500
501 out:
502 if (ino == MFT_REC_MFT && !sb->s_root)
503 sbi->mft.ni = NULL;
504
505 iget_failed(inode);
506 return ERR_PTR(err);
507 }
508
509 /*
510 * ntfs_test_inode
511 *
512 * Return: 1 if match.
513 */
ntfs_test_inode(struct inode * inode,void * data)514 static int ntfs_test_inode(struct inode *inode, void *data)
515 {
516 struct MFT_REF *ref = data;
517
518 return ino_get(ref) == inode->i_ino;
519 }
520
ntfs_set_inode(struct inode * inode,void * data)521 static int ntfs_set_inode(struct inode *inode, void *data)
522 {
523 const struct MFT_REF *ref = data;
524
525 inode->i_ino = ino_get(ref);
526 return 0;
527 }
528
ntfs_iget5(struct super_block * sb,const struct MFT_REF * ref,const struct cpu_str * name)529 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
530 const struct cpu_str *name)
531 {
532 struct inode *inode;
533
534 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
535 (void *)ref);
536 if (unlikely(!inode))
537 return ERR_PTR(-ENOMEM);
538
539 /* If this is a freshly allocated inode, need to read it now. */
540 if (inode->i_state & I_NEW)
541 inode = ntfs_read_mft(inode, name, ref);
542 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
543 /*
544 * Sequence number is not expected.
545 * Looks like inode was reused but caller uses the old reference
546 */
547 iput(inode);
548 inode = ERR_PTR(-ESTALE);
549 }
550
551 if (IS_ERR(inode))
552 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
553
554 return inode;
555 }
556
557 enum get_block_ctx {
558 GET_BLOCK_GENERAL = 0,
559 GET_BLOCK_WRITE_BEGIN = 1,
560 GET_BLOCK_DIRECT_IO_R = 2,
561 GET_BLOCK_DIRECT_IO_W = 3,
562 GET_BLOCK_BMAP = 4,
563 };
564
ntfs_get_block_vbo(struct inode * inode,u64 vbo,struct buffer_head * bh,int create,enum get_block_ctx ctx)565 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
566 struct buffer_head *bh, int create,
567 enum get_block_ctx ctx)
568 {
569 struct super_block *sb = inode->i_sb;
570 struct ntfs_sb_info *sbi = sb->s_fs_info;
571 struct ntfs_inode *ni = ntfs_i(inode);
572 struct folio *folio = bh->b_folio;
573 u8 cluster_bits = sbi->cluster_bits;
574 u32 block_size = sb->s_blocksize;
575 u64 bytes, lbo, valid;
576 u32 off;
577 int err;
578 CLST vcn, lcn, len;
579 bool new;
580
581 /* Clear previous state. */
582 clear_buffer_new(bh);
583 clear_buffer_uptodate(bh);
584
585 if (is_resident(ni)) {
586 bh->b_blocknr = RESIDENT_LCN;
587 bh->b_size = block_size;
588 if (!folio) {
589 /* direct io (read) or bmap call */
590 err = 0;
591 } else {
592 ni_lock(ni);
593 err = attr_data_read_resident(ni, folio);
594 ni_unlock(ni);
595
596 if (!err)
597 set_buffer_uptodate(bh);
598 }
599 return err;
600 }
601
602 vcn = vbo >> cluster_bits;
603 off = vbo & sbi->cluster_mask;
604 new = false;
605
606 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
607 create && sbi->cluster_size > PAGE_SIZE);
608 if (err)
609 goto out;
610
611 if (!len)
612 return 0;
613
614 bytes = ((u64)len << cluster_bits) - off;
615
616 if (lcn >= sbi->used.bitmap.nbits) {
617 /* This case includes resident/compressed/sparse. */
618 if (!create) {
619 if (bh->b_size > bytes)
620 bh->b_size = bytes;
621 return 0;
622 }
623 WARN_ON(1);
624 }
625
626 if (new)
627 set_buffer_new(bh);
628
629 lbo = ((u64)lcn << cluster_bits) + off;
630
631 set_buffer_mapped(bh);
632 bh->b_bdev = sb->s_bdev;
633 bh->b_blocknr = lbo >> sb->s_blocksize_bits;
634
635 valid = ni->i_valid;
636
637 if (ctx == GET_BLOCK_DIRECT_IO_W) {
638 /* ntfs_direct_IO will update ni->i_valid. */
639 if (vbo >= valid)
640 set_buffer_new(bh);
641 } else if (create) {
642 /* Normal write. */
643 if (bytes > bh->b_size)
644 bytes = bh->b_size;
645
646 if (vbo >= valid)
647 set_buffer_new(bh);
648
649 if (vbo + bytes > valid) {
650 ni->i_valid = vbo + bytes;
651 mark_inode_dirty(inode);
652 }
653 } else if (vbo >= valid) {
654 /* Read out of valid data. */
655 clear_buffer_mapped(bh);
656 } else if (vbo + bytes <= valid) {
657 /* Normal read. */
658 } else if (vbo + block_size <= valid) {
659 /* Normal short read. */
660 bytes = block_size;
661 } else {
662 /*
663 * Read across valid size: vbo < valid && valid < vbo + block_size
664 */
665 bytes = block_size;
666
667 if (folio) {
668 u32 voff = valid - vbo;
669
670 bh->b_size = block_size;
671 off = vbo & (PAGE_SIZE - 1);
672 folio_set_bh(bh, folio, off);
673
674 if (bh_read(bh, 0) < 0) {
675 err = -EIO;
676 goto out;
677 }
678 folio_zero_segment(folio, off + voff, off + block_size);
679 }
680 }
681
682 if (bh->b_size > bytes)
683 bh->b_size = bytes;
684
685 #ifndef __LP64__
686 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
687 static_assert(sizeof(size_t) < sizeof(loff_t));
688 if (bytes > 0x40000000u)
689 bh->b_size = 0x40000000u;
690 }
691 #endif
692
693 return 0;
694
695 out:
696 return err;
697 }
698
ntfs_get_block(struct inode * inode,sector_t vbn,struct buffer_head * bh_result,int create)699 int ntfs_get_block(struct inode *inode, sector_t vbn,
700 struct buffer_head *bh_result, int create)
701 {
702 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
703 bh_result, create, GET_BLOCK_GENERAL);
704 }
705
ntfs_get_block_bmap(struct inode * inode,sector_t vsn,struct buffer_head * bh_result,int create)706 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
707 struct buffer_head *bh_result, int create)
708 {
709 return ntfs_get_block_vbo(inode,
710 (u64)vsn << inode->i_sb->s_blocksize_bits,
711 bh_result, create, GET_BLOCK_BMAP);
712 }
713
ntfs_bmap(struct address_space * mapping,sector_t block)714 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
715 {
716 return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
717 }
718
ntfs_read_folio(struct file * file,struct folio * folio)719 static int ntfs_read_folio(struct file *file, struct folio *folio)
720 {
721 int err;
722 struct address_space *mapping = folio->mapping;
723 struct inode *inode = mapping->host;
724 struct ntfs_inode *ni = ntfs_i(inode);
725
726 if (is_resident(ni)) {
727 ni_lock(ni);
728 err = attr_data_read_resident(ni, folio);
729 ni_unlock(ni);
730 if (err != E_NTFS_NONRESIDENT) {
731 folio_unlock(folio);
732 return err;
733 }
734 }
735
736 if (is_compressed(ni)) {
737 ni_lock(ni);
738 err = ni_readpage_cmpr(ni, folio);
739 ni_unlock(ni);
740 return err;
741 }
742
743 /* Normal + sparse files. */
744 return mpage_read_folio(folio, ntfs_get_block);
745 }
746
ntfs_readahead(struct readahead_control * rac)747 static void ntfs_readahead(struct readahead_control *rac)
748 {
749 struct address_space *mapping = rac->mapping;
750 struct inode *inode = mapping->host;
751 struct ntfs_inode *ni = ntfs_i(inode);
752 u64 valid;
753 loff_t pos;
754
755 if (is_resident(ni)) {
756 /* No readahead for resident. */
757 return;
758 }
759
760 if (is_compressed(ni)) {
761 /* No readahead for compressed. */
762 return;
763 }
764
765 valid = ni->i_valid;
766 pos = readahead_pos(rac);
767
768 if (valid < i_size_read(inode) && pos <= valid &&
769 valid < pos + readahead_length(rac)) {
770 /* Range cross 'valid'. Read it page by page. */
771 return;
772 }
773
774 mpage_readahead(rac, ntfs_get_block);
775 }
776
ntfs_get_block_direct_IO_R(struct inode * inode,sector_t iblock,struct buffer_head * bh_result,int create)777 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
778 struct buffer_head *bh_result, int create)
779 {
780 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
781 bh_result, create, GET_BLOCK_DIRECT_IO_R);
782 }
783
ntfs_get_block_direct_IO_W(struct inode * inode,sector_t iblock,struct buffer_head * bh_result,int create)784 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
785 struct buffer_head *bh_result, int create)
786 {
787 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
788 bh_result, create, GET_BLOCK_DIRECT_IO_W);
789 }
790
ntfs_direct_IO(struct kiocb * iocb,struct iov_iter * iter)791 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
792 {
793 struct file *file = iocb->ki_filp;
794 struct address_space *mapping = file->f_mapping;
795 struct inode *inode = mapping->host;
796 struct ntfs_inode *ni = ntfs_i(inode);
797 loff_t vbo = iocb->ki_pos;
798 loff_t end;
799 int wr = iov_iter_rw(iter) & WRITE;
800 size_t iter_count = iov_iter_count(iter);
801 loff_t valid;
802 ssize_t ret;
803
804 if (is_resident(ni)) {
805 /* Switch to buffered write. */
806 ret = 0;
807 goto out;
808 }
809 if (is_compressed(ni)) {
810 ret = 0;
811 goto out;
812 }
813
814 ret = blockdev_direct_IO(iocb, inode, iter,
815 wr ? ntfs_get_block_direct_IO_W :
816 ntfs_get_block_direct_IO_R);
817
818 if (ret > 0)
819 end = vbo + ret;
820 else if (wr && ret == -EIOCBQUEUED)
821 end = vbo + iter_count;
822 else
823 goto out;
824
825 valid = ni->i_valid;
826 if (wr) {
827 if (end > valid && !S_ISBLK(inode->i_mode)) {
828 ni->i_valid = end;
829 mark_inode_dirty(inode);
830 }
831 } else if (vbo < valid && valid < end) {
832 /* Fix page. */
833 iov_iter_revert(iter, end - valid);
834 iov_iter_zero(end - valid, iter);
835 }
836
837 out:
838 return ret;
839 }
840
ntfs_set_size(struct inode * inode,u64 new_size)841 int ntfs_set_size(struct inode *inode, u64 new_size)
842 {
843 struct super_block *sb = inode->i_sb;
844 struct ntfs_sb_info *sbi = sb->s_fs_info;
845 struct ntfs_inode *ni = ntfs_i(inode);
846 int err;
847
848 /* Check for maximum file size. */
849 if (is_sparsed(ni) || is_compressed(ni)) {
850 if (new_size > sbi->maxbytes_sparse) {
851 err = -EFBIG;
852 goto out;
853 }
854 } else if (new_size > sbi->maxbytes) {
855 err = -EFBIG;
856 goto out;
857 }
858
859 ni_lock(ni);
860 down_write(&ni->file.run_lock);
861
862 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
863 &ni->i_valid, true, NULL);
864
865 up_write(&ni->file.run_lock);
866 ni_unlock(ni);
867
868 mark_inode_dirty(inode);
869
870 out:
871 return err;
872 }
873
ntfs_resident_writepage(struct folio * folio,struct writeback_control * wbc)874 static int ntfs_resident_writepage(struct folio *folio,
875 struct writeback_control *wbc)
876 {
877 struct address_space *mapping = folio->mapping;
878 struct inode *inode = mapping->host;
879 struct ntfs_inode *ni = ntfs_i(inode);
880 int ret;
881
882 /* Avoid any operation if inode is bad. */
883 if (unlikely(is_bad_ni(ni)))
884 return -EINVAL;
885
886 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
887 return -EIO;
888
889 ni_lock(ni);
890 ret = attr_data_write_resident(ni, folio);
891 ni_unlock(ni);
892
893 if (ret != E_NTFS_NONRESIDENT)
894 folio_unlock(folio);
895 mapping_set_error(mapping, ret);
896 return ret;
897 }
898
ntfs_writepages(struct address_space * mapping,struct writeback_control * wbc)899 static int ntfs_writepages(struct address_space *mapping,
900 struct writeback_control *wbc)
901 {
902 struct inode *inode = mapping->host;
903
904 /* Avoid any operation if inode is bad. */
905 if (unlikely(is_bad_ni(ntfs_i(inode))))
906 return -EINVAL;
907
908 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
909 return -EIO;
910
911 if (is_resident(ntfs_i(inode))) {
912 struct folio *folio = NULL;
913 int error;
914
915 while ((folio = writeback_iter(mapping, wbc, folio, &error)))
916 error = ntfs_resident_writepage(folio, wbc);
917 return error;
918 }
919 return mpage_writepages(mapping, wbc, ntfs_get_block);
920 }
921
ntfs_get_block_write_begin(struct inode * inode,sector_t vbn,struct buffer_head * bh_result,int create)922 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
923 struct buffer_head *bh_result, int create)
924 {
925 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
926 bh_result, create, GET_BLOCK_WRITE_BEGIN);
927 }
928
ntfs_write_begin(const struct kiocb * iocb,struct address_space * mapping,loff_t pos,u32 len,struct folio ** foliop,void ** fsdata)929 int ntfs_write_begin(const struct kiocb *iocb, struct address_space *mapping,
930 loff_t pos, u32 len, struct folio **foliop, void **fsdata)
931 {
932 int err;
933 struct inode *inode = mapping->host;
934 struct ntfs_inode *ni = ntfs_i(inode);
935
936 /* Avoid any operation if inode is bad. */
937 if (unlikely(is_bad_ni(ni)))
938 return -EINVAL;
939
940 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
941 return -EIO;
942
943 if (is_resident(ni)) {
944 struct folio *folio = __filemap_get_folio(
945 mapping, pos >> PAGE_SHIFT, FGP_WRITEBEGIN,
946 mapping_gfp_mask(mapping));
947
948 if (IS_ERR(folio)) {
949 err = PTR_ERR(folio);
950 goto out;
951 }
952
953 ni_lock(ni);
954 err = attr_data_read_resident(ni, folio);
955 ni_unlock(ni);
956
957 if (!err) {
958 *foliop = folio;
959 goto out;
960 }
961 folio_unlock(folio);
962 folio_put(folio);
963
964 if (err != E_NTFS_NONRESIDENT)
965 goto out;
966 }
967
968 err = block_write_begin(mapping, pos, len, foliop,
969 ntfs_get_block_write_begin);
970
971 out:
972 return err;
973 }
974
975 /*
976 * ntfs_write_end - Address_space_operations::write_end.
977 */
ntfs_write_end(const struct kiocb * iocb,struct address_space * mapping,loff_t pos,u32 len,u32 copied,struct folio * folio,void * fsdata)978 int ntfs_write_end(const struct kiocb *iocb,
979 struct address_space *mapping, loff_t pos,
980 u32 len, u32 copied, struct folio *folio, void *fsdata)
981 {
982 struct inode *inode = mapping->host;
983 struct ntfs_inode *ni = ntfs_i(inode);
984 u64 valid = ni->i_valid;
985 bool dirty = false;
986 int err;
987
988 if (is_resident(ni)) {
989 ni_lock(ni);
990 err = attr_data_write_resident(ni, folio);
991 ni_unlock(ni);
992 if (!err) {
993 struct buffer_head *head = folio_buffers(folio);
994 dirty = true;
995 /* Clear any buffers in folio. */
996 if (head) {
997 struct buffer_head *bh = head;
998
999 do {
1000 clear_buffer_dirty(bh);
1001 clear_buffer_mapped(bh);
1002 set_buffer_uptodate(bh);
1003 } while (head != (bh = bh->b_this_page));
1004 }
1005 folio_mark_uptodate(folio);
1006 err = copied;
1007 }
1008 folio_unlock(folio);
1009 folio_put(folio);
1010 } else {
1011 err = generic_write_end(iocb, mapping, pos, len, copied, folio,
1012 fsdata);
1013 }
1014
1015 if (err >= 0) {
1016 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
1017 inode_set_mtime_to_ts(inode,
1018 inode_set_ctime_current(inode));
1019 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
1020 dirty = true;
1021 }
1022
1023 if (valid != ni->i_valid) {
1024 /* ni->i_valid is changed in ntfs_get_block_vbo. */
1025 dirty = true;
1026 }
1027
1028 if (pos + err > inode->i_size) {
1029 i_size_write(inode, pos + err);
1030 dirty = true;
1031 }
1032
1033 if (dirty)
1034 mark_inode_dirty(inode);
1035 }
1036
1037 return err;
1038 }
1039
ntfs3_write_inode(struct inode * inode,struct writeback_control * wbc)1040 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1041 {
1042 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1043 }
1044
ntfs_sync_inode(struct inode * inode)1045 int ntfs_sync_inode(struct inode *inode)
1046 {
1047 return _ni_write_inode(inode, 1);
1048 }
1049
1050 /*
1051 * Helper function to read file.
1052 */
inode_read_data(struct inode * inode,void * data,size_t bytes)1053 int inode_read_data(struct inode *inode, void *data, size_t bytes)
1054 {
1055 pgoff_t idx;
1056 struct address_space *mapping = inode->i_mapping;
1057
1058 for (idx = 0; bytes; idx++) {
1059 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1060 struct page *page = read_mapping_page(mapping, idx, NULL);
1061 void *kaddr;
1062
1063 if (IS_ERR(page))
1064 return PTR_ERR(page);
1065
1066 kaddr = kmap_atomic(page);
1067 memcpy(data, kaddr, op);
1068 kunmap_atomic(kaddr);
1069
1070 put_page(page);
1071
1072 bytes -= op;
1073 data = Add2Ptr(data, PAGE_SIZE);
1074 }
1075 return 0;
1076 }
1077
1078 /*
1079 * ntfs_reparse_bytes
1080 *
1081 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1082 * for unicode string of @uni_len length.
1083 */
ntfs_reparse_bytes(u32 uni_len,bool is_absolute)1084 static inline u32 ntfs_reparse_bytes(u32 uni_len, bool is_absolute)
1085 {
1086 /* Header + unicode string + decorated unicode string. */
1087 return sizeof(short) * (2 * uni_len + (is_absolute ? 4 : 0)) +
1088 offsetof(struct REPARSE_DATA_BUFFER,
1089 SymbolicLinkReparseBuffer.PathBuffer);
1090 }
1091
1092 static struct REPARSE_DATA_BUFFER *
ntfs_create_reparse_buffer(struct ntfs_sb_info * sbi,const char * symname,u32 size,u16 * nsize)1093 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1094 u32 size, u16 *nsize)
1095 {
1096 int i, err;
1097 struct REPARSE_DATA_BUFFER *rp;
1098 __le16 *rp_name;
1099 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1100 bool is_absolute;
1101
1102 is_absolute = (strlen(symname) > 1 && symname[1] == ':');
1103
1104 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2, is_absolute), GFP_NOFS);
1105 if (!rp)
1106 return ERR_PTR(-ENOMEM);
1107
1108 rs = &rp->SymbolicLinkReparseBuffer;
1109 rp_name = rs->PathBuffer;
1110
1111 /* Convert link name to UTF-16. */
1112 err = ntfs_nls_to_utf16(sbi, symname, size,
1113 (struct cpu_str *)(rp_name - 1), 2 * size,
1114 UTF16_LITTLE_ENDIAN);
1115 if (err < 0)
1116 goto out;
1117
1118 /* err = the length of unicode name of symlink. */
1119 *nsize = ntfs_reparse_bytes(err, is_absolute);
1120
1121 if (*nsize > sbi->reparse.max_size) {
1122 err = -EFBIG;
1123 goto out;
1124 }
1125
1126 /* Translate Linux '/' into Windows '\'. */
1127 for (i = 0; i < err; i++) {
1128 if (rp_name[i] == cpu_to_le16('/'))
1129 rp_name[i] = cpu_to_le16('\\');
1130 }
1131
1132 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1133 rp->ReparseDataLength =
1134 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1135 SymbolicLinkReparseBuffer));
1136
1137 /* PrintName + SubstituteName. */
1138 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1139 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + (is_absolute ? 8 : 0));
1140 rs->PrintNameLength = rs->SubstituteNameOffset;
1141
1142 /*
1143 * TODO: Use relative path if possible to allow Windows to
1144 * parse this path.
1145 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1146 */
1147 rs->Flags = cpu_to_le32(is_absolute ? 0 : SYMLINK_FLAG_RELATIVE);
1148
1149 memmove(rp_name + err + (is_absolute ? 4 : 0), rp_name, sizeof(short) * err);
1150
1151 if (is_absolute) {
1152 /* Decorate SubstituteName. */
1153 rp_name += err;
1154 rp_name[0] = cpu_to_le16('\\');
1155 rp_name[1] = cpu_to_le16('?');
1156 rp_name[2] = cpu_to_le16('?');
1157 rp_name[3] = cpu_to_le16('\\');
1158 }
1159
1160 return rp;
1161 out:
1162 kfree(rp);
1163 return ERR_PTR(err);
1164 }
1165
1166 /*
1167 * ntfs_create_inode
1168 *
1169 * Helper function for:
1170 * - ntfs_create
1171 * - ntfs_mknod
1172 * - ntfs_symlink
1173 * - ntfs_mkdir
1174 * - ntfs_atomic_open
1175 *
1176 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1177 */
ntfs_create_inode(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,const struct cpu_str * uni,umode_t mode,dev_t dev,const char * symname,u32 size,struct ntfs_fnd * fnd)1178 int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1179 struct dentry *dentry, const struct cpu_str *uni,
1180 umode_t mode, dev_t dev, const char *symname, u32 size,
1181 struct ntfs_fnd *fnd)
1182 {
1183 int err;
1184 struct super_block *sb = dir->i_sb;
1185 struct ntfs_sb_info *sbi = sb->s_fs_info;
1186 const struct qstr *name = &dentry->d_name;
1187 CLST ino = 0;
1188 struct ntfs_inode *dir_ni = ntfs_i(dir);
1189 struct ntfs_inode *ni = NULL;
1190 struct inode *inode = NULL;
1191 struct ATTRIB *attr;
1192 struct ATTR_STD_INFO5 *std5;
1193 struct ATTR_FILE_NAME *fname;
1194 struct MFT_REC *rec;
1195 u32 asize, dsize, sd_size;
1196 enum FILE_ATTRIBUTE fa;
1197 __le32 security_id = SECURITY_ID_INVALID;
1198 CLST vcn;
1199 const void *sd;
1200 u16 t16, nsize = 0, aid = 0;
1201 struct INDEX_ROOT *root, *dir_root;
1202 struct NTFS_DE *e, *new_de = NULL;
1203 struct REPARSE_DATA_BUFFER *rp = NULL;
1204 bool rp_inserted = false;
1205
1206 /* New file will be resident or non resident. */
1207 const bool new_file_resident = 1;
1208
1209 if (!fnd)
1210 ni_lock_dir(dir_ni);
1211
1212 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1213 if (!dir_root) {
1214 err = -EINVAL;
1215 goto out1;
1216 }
1217
1218 if (S_ISDIR(mode)) {
1219 /* Use parent's directory attributes. */
1220 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1221 FILE_ATTRIBUTE_ARCHIVE;
1222 /*
1223 * By default child directory inherits parent attributes.
1224 * Root directory is hidden + system.
1225 * Make an exception for children in root.
1226 */
1227 if (dir->i_ino == MFT_REC_ROOT)
1228 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1229 } else if (S_ISLNK(mode)) {
1230 /* It is good idea that link should be the same type (file/dir) as target */
1231 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1232
1233 /*
1234 * Linux: there are dir/file/symlink and so on.
1235 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1236 * It is good idea to create:
1237 * dir + reparse if 'symname' points to directory
1238 * or
1239 * file + reparse if 'symname' points to file
1240 * Unfortunately kern_path hangs if symname contains 'dir'.
1241 */
1242
1243 /*
1244 * struct path path;
1245 *
1246 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1247 * struct inode *target = d_inode(path.dentry);
1248 *
1249 * if (S_ISDIR(target->i_mode))
1250 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1251 * // if ( target->i_sb == sb ){
1252 * // use relative path?
1253 * // }
1254 * path_put(&path);
1255 * }
1256 */
1257 } else if (S_ISREG(mode)) {
1258 if (sbi->options->sparse) {
1259 /* Sparsed regular file, cause option 'sparse'. */
1260 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1261 FILE_ATTRIBUTE_ARCHIVE;
1262 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1263 /* Compressed regular file, if parent is compressed. */
1264 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1265 } else {
1266 /* Regular file, default attributes. */
1267 fa = FILE_ATTRIBUTE_ARCHIVE;
1268 }
1269 } else {
1270 fa = FILE_ATTRIBUTE_ARCHIVE;
1271 }
1272
1273 /* If option "hide_dot_files" then set hidden attribute for dot files. */
1274 if (sbi->options->hide_dot_files && name->name[0] == '.')
1275 fa |= FILE_ATTRIBUTE_HIDDEN;
1276
1277 if (!(mode & 0222))
1278 fa |= FILE_ATTRIBUTE_READONLY;
1279
1280 /* Allocate PATH_MAX bytes. */
1281 new_de = __getname();
1282 if (!new_de) {
1283 err = -ENOMEM;
1284 goto out1;
1285 }
1286
1287 /* Avoid any operation if inode is bad. */
1288 if (unlikely(is_bad_ni(dir_ni))) {
1289 err = -EINVAL;
1290 goto out2;
1291 }
1292
1293 if (unlikely(ntfs3_forced_shutdown(sb))) {
1294 err = -EIO;
1295 goto out2;
1296 }
1297
1298 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1299 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1300
1301 /* Step 1: allocate and fill new mft record. */
1302 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1303 if (err)
1304 goto out2;
1305
1306 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1307 if (IS_ERR(ni)) {
1308 err = PTR_ERR(ni);
1309 ni = NULL;
1310 goto out3;
1311 }
1312 inode = &ni->vfs_inode;
1313 inode_init_owner(idmap, inode, dir, mode);
1314 mode = inode->i_mode;
1315
1316 ni->i_crtime = current_time(inode);
1317
1318 rec = ni->mi.mrec;
1319 rec->hard_links = cpu_to_le16(1);
1320 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1321
1322 /* Get default security id. */
1323 sd = s_default_security;
1324 sd_size = sizeof(s_default_security);
1325
1326 if (is_ntfs3(sbi)) {
1327 security_id = dir_ni->std_security_id;
1328 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1329 security_id = sbi->security.def_security_id;
1330
1331 if (security_id == SECURITY_ID_INVALID &&
1332 !ntfs_insert_security(sbi, sd, sd_size,
1333 &security_id, NULL))
1334 sbi->security.def_security_id = security_id;
1335 }
1336 }
1337
1338 /* Insert standard info. */
1339 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1340
1341 if (security_id == SECURITY_ID_INVALID) {
1342 dsize = sizeof(struct ATTR_STD_INFO);
1343 } else {
1344 dsize = sizeof(struct ATTR_STD_INFO5);
1345 std5->security_id = security_id;
1346 ni->std_security_id = security_id;
1347 }
1348 asize = SIZEOF_RESIDENT + dsize;
1349
1350 attr->type = ATTR_STD;
1351 attr->size = cpu_to_le32(asize);
1352 attr->id = cpu_to_le16(aid++);
1353 attr->res.data_off = SIZEOF_RESIDENT_LE;
1354 attr->res.data_size = cpu_to_le32(dsize);
1355
1356 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1357 kernel2nt(&ni->i_crtime);
1358
1359 std5->fa = ni->std_fa = fa;
1360
1361 attr = Add2Ptr(attr, asize);
1362
1363 /* Insert file name. */
1364 err = fill_name_de(sbi, new_de, name, uni);
1365 if (err)
1366 goto out4;
1367
1368 mi_get_ref(&ni->mi, &new_de->ref);
1369
1370 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1371
1372 if (sbi->options->windows_names &&
1373 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1374 err = -EINVAL;
1375 goto out4;
1376 }
1377
1378 mi_get_ref(&dir_ni->mi, &fname->home);
1379 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1380 fname->dup.a_time = std5->cr_time;
1381 fname->dup.alloc_size = fname->dup.data_size = 0;
1382 fname->dup.fa = std5->fa;
1383 fname->dup.extend_data = S_ISLNK(mode) ? IO_REPARSE_TAG_SYMLINK : 0;
1384
1385 dsize = le16_to_cpu(new_de->key_size);
1386 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1387
1388 attr->type = ATTR_NAME;
1389 attr->size = cpu_to_le32(asize);
1390 attr->res.data_off = SIZEOF_RESIDENT_LE;
1391 attr->res.flags = RESIDENT_FLAG_INDEXED;
1392 attr->id = cpu_to_le16(aid++);
1393 attr->res.data_size = cpu_to_le32(dsize);
1394 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1395
1396 attr = Add2Ptr(attr, asize);
1397
1398 if (security_id == SECURITY_ID_INVALID) {
1399 /* Insert security attribute. */
1400 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1401
1402 attr->type = ATTR_SECURE;
1403 attr->size = cpu_to_le32(asize);
1404 attr->id = cpu_to_le16(aid++);
1405 attr->res.data_off = SIZEOF_RESIDENT_LE;
1406 attr->res.data_size = cpu_to_le32(sd_size);
1407 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1408
1409 attr = Add2Ptr(attr, asize);
1410 }
1411
1412 attr->id = cpu_to_le16(aid++);
1413 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1414 /*
1415 * Regular directory or symlink to directory.
1416 * Create root attribute.
1417 */
1418 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1419 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1420
1421 attr->type = ATTR_ROOT;
1422 attr->size = cpu_to_le32(asize);
1423
1424 attr->name_len = ARRAY_SIZE(I30_NAME);
1425 attr->name_off = SIZEOF_RESIDENT_LE;
1426 attr->res.data_off =
1427 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1428 attr->res.data_size = cpu_to_le32(dsize);
1429 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1430 sizeof(I30_NAME));
1431
1432 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1433 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1434 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1435 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1436 sizeof(struct NTFS_DE));
1437 root->ihdr.total = root->ihdr.used;
1438
1439 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1440 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1441 e->flags = NTFS_IE_LAST;
1442 } else if (S_ISLNK(mode)) {
1443 /*
1444 * Symlink to file.
1445 * Create empty resident data attribute.
1446 */
1447 asize = SIZEOF_RESIDENT;
1448
1449 /* Insert empty ATTR_DATA */
1450 attr->type = ATTR_DATA;
1451 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1452 attr->name_off = SIZEOF_RESIDENT_LE;
1453 attr->res.data_off = SIZEOF_RESIDENT_LE;
1454 } else if (!new_file_resident && S_ISREG(mode)) {
1455 /*
1456 * Regular file. Create empty non resident data attribute.
1457 */
1458 attr->type = ATTR_DATA;
1459 attr->non_res = 1;
1460 attr->nres.evcn = cpu_to_le64(-1ll);
1461 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1462 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1463 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1464 attr->flags = ATTR_FLAG_SPARSED;
1465 asize = SIZEOF_NONRESIDENT_EX + 8;
1466 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1467 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1468 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1469 attr->flags = ATTR_FLAG_COMPRESSED;
1470 attr->nres.c_unit = NTFS_LZNT_CUNIT;
1471 asize = SIZEOF_NONRESIDENT_EX + 8;
1472 } else {
1473 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1474 attr->name_off = SIZEOF_NONRESIDENT_LE;
1475 asize = SIZEOF_NONRESIDENT + 8;
1476 }
1477 attr->nres.run_off = attr->name_off;
1478 } else {
1479 /*
1480 * Node. Create empty resident data attribute.
1481 */
1482 attr->type = ATTR_DATA;
1483 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1484 attr->name_off = SIZEOF_RESIDENT_LE;
1485 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1486 attr->flags = ATTR_FLAG_SPARSED;
1487 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1488 attr->flags = ATTR_FLAG_COMPRESSED;
1489 attr->res.data_off = SIZEOF_RESIDENT_LE;
1490 asize = SIZEOF_RESIDENT;
1491 ni->ni_flags |= NI_FLAG_RESIDENT;
1492 }
1493
1494 if (S_ISDIR(mode)) {
1495 ni->ni_flags |= NI_FLAG_DIR;
1496 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1497 if (err)
1498 goto out4;
1499 } else if (S_ISLNK(mode)) {
1500 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1501
1502 if (IS_ERR(rp)) {
1503 err = PTR_ERR(rp);
1504 rp = NULL;
1505 goto out4;
1506 }
1507
1508 /*
1509 * Insert ATTR_REPARSE.
1510 */
1511 attr = Add2Ptr(attr, asize);
1512 attr->type = ATTR_REPARSE;
1513 attr->id = cpu_to_le16(aid++);
1514
1515 /* Resident or non resident? */
1516 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1517 t16 = PtrOffset(rec, attr);
1518
1519 /*
1520 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1521 * It is good idea to keep extended attributes resident.
1522 */
1523 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1524 CLST alen;
1525 CLST clst = bytes_to_cluster(sbi, nsize);
1526
1527 /* Bytes per runs. */
1528 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1529
1530 attr->non_res = 1;
1531 attr->nres.evcn = cpu_to_le64(clst - 1);
1532 attr->name_off = SIZEOF_NONRESIDENT_LE;
1533 attr->nres.run_off = attr->name_off;
1534 attr->nres.data_size = cpu_to_le64(nsize);
1535 attr->nres.valid_size = attr->nres.data_size;
1536 attr->nres.alloc_size =
1537 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1538
1539 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1540 clst, NULL, ALLOCATE_DEF,
1541 &alen, 0, NULL, NULL);
1542 if (err)
1543 goto out5;
1544
1545 err = run_pack(&ni->file.run, 0, clst,
1546 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1547 &vcn);
1548 if (err < 0)
1549 goto out5;
1550
1551 if (vcn != clst) {
1552 err = -EINVAL;
1553 goto out5;
1554 }
1555
1556 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1557 /* Write non resident data. */
1558 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1559 nsize, 0);
1560 if (err)
1561 goto out5;
1562 } else {
1563 attr->res.data_off = SIZEOF_RESIDENT_LE;
1564 attr->res.data_size = cpu_to_le32(nsize);
1565 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1566 }
1567 /* Size of symlink equals the length of input string. */
1568 inode->i_size = size;
1569
1570 attr->size = cpu_to_le32(asize);
1571
1572 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1573 &new_de->ref);
1574 if (err)
1575 goto out5;
1576
1577 rp_inserted = true;
1578 }
1579
1580 attr = Add2Ptr(attr, asize);
1581 attr->type = ATTR_END;
1582
1583 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1584 rec->next_attr_id = cpu_to_le16(aid);
1585
1586 inode->i_generation = le16_to_cpu(rec->seq);
1587
1588 if (S_ISDIR(mode)) {
1589 inode->i_op = &ntfs_dir_inode_operations;
1590 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1591 &ntfs_legacy_dir_operations :
1592 &ntfs_dir_operations;
1593 } else if (S_ISLNK(mode)) {
1594 inode->i_op = &ntfs_link_inode_operations;
1595 inode->i_fop = NULL;
1596 inode->i_mapping->a_ops = &ntfs_aops;
1597 inode->i_size = size;
1598 inode_nohighmem(inode);
1599 } else if (S_ISREG(mode)) {
1600 inode->i_op = &ntfs_file_inode_operations;
1601 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1602 &ntfs_legacy_file_operations :
1603 &ntfs_file_operations;
1604 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1605 &ntfs_aops;
1606 init_rwsem(&ni->file.run_lock);
1607 } else {
1608 inode->i_op = &ntfs_special_inode_operations;
1609 init_special_inode(inode, mode, dev);
1610 }
1611
1612 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1613 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1614 err = ntfs_init_acl(idmap, inode, dir);
1615 if (err)
1616 goto out5;
1617 } else
1618 #endif
1619 {
1620 inode->i_flags |= S_NOSEC;
1621 }
1622
1623 if (!S_ISLNK(mode)) {
1624 /*
1625 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1626 * The packed size of extended attribute is stored in direntry too.
1627 * 'fname' here points to inside new_de.
1628 */
1629 err = ntfs_save_wsl_perm(inode, &fname->dup.extend_data);
1630 if (err)
1631 goto out6;
1632
1633 /*
1634 * update ea_size in file_name attribute too.
1635 * Use ni_find_attr cause layout of MFT record may be changed
1636 * in ntfs_init_acl and ntfs_save_wsl_perm.
1637 */
1638 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
1639 if (attr) {
1640 struct ATTR_FILE_NAME *fn;
1641
1642 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1643 if (fn)
1644 fn->dup.extend_data = fname->dup.extend_data;
1645 }
1646 }
1647
1648 /* We do not need to update parent directory later */
1649 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1650
1651 /* Step 2: Add new name in index. */
1652 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1653 if (err)
1654 goto out6;
1655
1656 /*
1657 * Call 'd_instantiate' after inode->i_op is set
1658 * but before finish_open.
1659 */
1660 d_instantiate(dentry, inode);
1661
1662 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1663 inode_set_atime_to_ts(inode, ni->i_crtime);
1664 inode_set_ctime_to_ts(inode, ni->i_crtime);
1665 inode_set_mtime_to_ts(inode, ni->i_crtime);
1666 inode_set_mtime_to_ts(dir, ni->i_crtime);
1667 inode_set_ctime_to_ts(dir, ni->i_crtime);
1668
1669 mark_inode_dirty(dir);
1670 mark_inode_dirty(inode);
1671
1672 /* Normal exit. */
1673 goto out2;
1674
1675 out6:
1676 attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL);
1677 if (attr && attr->non_res) {
1678 /* Delete ATTR_EA, if non-resident. */
1679 struct runs_tree run;
1680 run_init(&run);
1681 attr_set_size(ni, ATTR_EA, NULL, 0, &run, 0, NULL, false, NULL);
1682 run_close(&run);
1683 }
1684
1685 if (rp_inserted)
1686 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1687
1688 out5:
1689 if (!S_ISDIR(mode))
1690 run_deallocate(sbi, &ni->file.run, false);
1691
1692 out4:
1693 clear_rec_inuse(rec);
1694 clear_nlink(inode);
1695 ni->mi.dirty = false;
1696 discard_new_inode(inode);
1697 out3:
1698 ntfs_mark_rec_free(sbi, ino, false);
1699
1700 out2:
1701 __putname(new_de);
1702 kfree(rp);
1703
1704 out1:
1705 if (!fnd)
1706 ni_unlock(dir_ni);
1707
1708 if (!err)
1709 unlock_new_inode(inode);
1710
1711 return err;
1712 }
1713
ntfs_link_inode(struct inode * inode,struct dentry * dentry)1714 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1715 {
1716 int err;
1717 struct ntfs_inode *ni = ntfs_i(inode);
1718 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1719 struct NTFS_DE *de;
1720
1721 /* Allocate PATH_MAX bytes. */
1722 de = __getname();
1723 if (!de)
1724 return -ENOMEM;
1725
1726 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1727 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1728
1729 /* Construct 'de'. */
1730 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1731 if (err)
1732 goto out;
1733
1734 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1735 out:
1736 __putname(de);
1737 return err;
1738 }
1739
1740 /*
1741 * ntfs_unlink_inode
1742 *
1743 * inode_operations::unlink
1744 * inode_operations::rmdir
1745 */
ntfs_unlink_inode(struct inode * dir,const struct dentry * dentry)1746 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1747 {
1748 int err;
1749 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1750 struct inode *inode = d_inode(dentry);
1751 struct ntfs_inode *ni = ntfs_i(inode);
1752 struct ntfs_inode *dir_ni = ntfs_i(dir);
1753 struct NTFS_DE *de, *de2 = NULL;
1754 int undo_remove;
1755
1756 if (ntfs_is_meta_file(sbi, ni->mi.rno))
1757 return -EINVAL;
1758
1759 /* Allocate PATH_MAX bytes. */
1760 de = __getname();
1761 if (!de)
1762 return -ENOMEM;
1763
1764 ni_lock(ni);
1765
1766 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1767 err = -ENOTEMPTY;
1768 goto out;
1769 }
1770
1771 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1772 if (err < 0)
1773 goto out;
1774
1775 undo_remove = 0;
1776 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1777
1778 if (!err) {
1779 drop_nlink(inode);
1780 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1781 mark_inode_dirty(dir);
1782 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1783 if (inode->i_nlink)
1784 mark_inode_dirty(inode);
1785 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1786 _ntfs_bad_inode(inode);
1787 } else {
1788 if (ni_is_dirty(dir))
1789 mark_inode_dirty(dir);
1790 if (ni_is_dirty(inode))
1791 mark_inode_dirty(inode);
1792 }
1793
1794 out:
1795 ni_unlock(ni);
1796 __putname(de);
1797 return err;
1798 }
1799
ntfs_evict_inode(struct inode * inode)1800 void ntfs_evict_inode(struct inode *inode)
1801 {
1802 truncate_inode_pages_final(&inode->i_data);
1803
1804 invalidate_inode_buffers(inode);
1805 clear_inode(inode);
1806
1807 ni_clear(ntfs_i(inode));
1808 }
1809
1810 /*
1811 * ntfs_translate_junction
1812 *
1813 * Translate a Windows junction target to the Linux equivalent.
1814 * On junctions, targets are always absolute (they include the drive
1815 * letter). We have no way of knowing if the target is for the current
1816 * mounted device or not so we just assume it is.
1817 */
ntfs_translate_junction(const struct super_block * sb,const struct dentry * link_de,char * target,int target_len,int target_max)1818 static int ntfs_translate_junction(const struct super_block *sb,
1819 const struct dentry *link_de, char *target,
1820 int target_len, int target_max)
1821 {
1822 int tl_len, err = target_len;
1823 char *link_path_buffer = NULL, *link_path;
1824 char *translated = NULL;
1825 char *target_start;
1826 int copy_len;
1827
1828 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1829 if (!link_path_buffer) {
1830 err = -ENOMEM;
1831 goto out;
1832 }
1833 /* Get link path, relative to mount point */
1834 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1835 if (IS_ERR(link_path)) {
1836 ntfs_err(sb, "Error getting link path");
1837 err = -EINVAL;
1838 goto out;
1839 }
1840
1841 translated = kmalloc(PATH_MAX, GFP_NOFS);
1842 if (!translated) {
1843 err = -ENOMEM;
1844 goto out;
1845 }
1846
1847 /* Make translated path a relative path to mount point */
1848 strcpy(translated, "./");
1849 ++link_path; /* Skip leading / */
1850 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1851 if (*link_path == '/') {
1852 if (PATH_MAX - tl_len < sizeof("../")) {
1853 ntfs_err(sb,
1854 "Link path %s has too many components",
1855 link_path);
1856 err = -EINVAL;
1857 goto out;
1858 }
1859 strcpy(translated + tl_len, "../");
1860 tl_len += sizeof("../") - 1;
1861 }
1862 }
1863
1864 /* Skip drive letter */
1865 target_start = target;
1866 while (*target_start && *target_start != ':')
1867 ++target_start;
1868
1869 if (!*target_start) {
1870 ntfs_err(sb, "Link target (%s) missing drive separator",
1871 target);
1872 err = -EINVAL;
1873 goto out;
1874 }
1875
1876 /* Skip drive separator and leading /, if exists */
1877 target_start += 1 + (target_start[1] == '/');
1878 copy_len = target_len - (target_start - target);
1879
1880 if (PATH_MAX - tl_len <= copy_len) {
1881 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1882 target_start, PATH_MAX - tl_len, copy_len);
1883 err = -EINVAL;
1884 goto out;
1885 }
1886
1887 /* translated path has a trailing / and target_start does not */
1888 strcpy(translated + tl_len, target_start);
1889 tl_len += copy_len;
1890 if (target_max <= tl_len) {
1891 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1892 translated, target_max, tl_len);
1893 err = -EINVAL;
1894 goto out;
1895 }
1896 strcpy(target, translated);
1897 err = tl_len;
1898
1899 out:
1900 kfree(link_path_buffer);
1901 kfree(translated);
1902 return err;
1903 }
1904
ntfs_readlink_hlp(const struct dentry * link_de,struct inode * inode,char * buffer,int buflen)1905 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1906 struct inode *inode, char *buffer,
1907 int buflen)
1908 {
1909 int i, err = -EINVAL;
1910 struct ntfs_inode *ni = ntfs_i(inode);
1911 struct super_block *sb = inode->i_sb;
1912 struct ntfs_sb_info *sbi = sb->s_fs_info;
1913 u64 size;
1914 u16 ulen = 0;
1915 void *to_free = NULL;
1916 struct REPARSE_DATA_BUFFER *rp;
1917 const __le16 *uname;
1918 struct ATTRIB *attr;
1919
1920 /* Reparse data present. Try to parse it. */
1921 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1922 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1923
1924 *buffer = 0;
1925
1926 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1927 if (!attr)
1928 goto out;
1929
1930 if (!attr->non_res) {
1931 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1932 if (!rp)
1933 goto out;
1934 size = le32_to_cpu(attr->res.data_size);
1935 } else {
1936 size = le64_to_cpu(attr->nres.data_size);
1937 rp = NULL;
1938 }
1939
1940 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1941 goto out;
1942
1943 if (!rp) {
1944 rp = kmalloc(size, GFP_NOFS);
1945 if (!rp) {
1946 err = -ENOMEM;
1947 goto out;
1948 }
1949 to_free = rp;
1950 /* Read into temporal buffer. */
1951 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1952 if (err)
1953 goto out;
1954 }
1955
1956 /* Microsoft Tag. */
1957 switch (rp->ReparseTag) {
1958 case IO_REPARSE_TAG_MOUNT_POINT:
1959 /* Mount points and junctions. */
1960 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1961 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1962 MountPointReparseBuffer.PathBuffer))
1963 goto out;
1964 uname = Add2Ptr(rp,
1965 offsetof(struct REPARSE_DATA_BUFFER,
1966 MountPointReparseBuffer.PathBuffer) +
1967 le16_to_cpu(rp->MountPointReparseBuffer
1968 .PrintNameOffset));
1969 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1970 break;
1971
1972 case IO_REPARSE_TAG_SYMLINK:
1973 /* FolderSymbolicLink */
1974 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1975 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1976 SymbolicLinkReparseBuffer.PathBuffer))
1977 goto out;
1978 uname = Add2Ptr(
1979 rp, offsetof(struct REPARSE_DATA_BUFFER,
1980 SymbolicLinkReparseBuffer.PathBuffer) +
1981 le16_to_cpu(rp->SymbolicLinkReparseBuffer
1982 .PrintNameOffset));
1983 ulen = le16_to_cpu(
1984 rp->SymbolicLinkReparseBuffer.PrintNameLength);
1985 break;
1986
1987 case IO_REPARSE_TAG_CLOUD:
1988 case IO_REPARSE_TAG_CLOUD_1:
1989 case IO_REPARSE_TAG_CLOUD_2:
1990 case IO_REPARSE_TAG_CLOUD_3:
1991 case IO_REPARSE_TAG_CLOUD_4:
1992 case IO_REPARSE_TAG_CLOUD_5:
1993 case IO_REPARSE_TAG_CLOUD_6:
1994 case IO_REPARSE_TAG_CLOUD_7:
1995 case IO_REPARSE_TAG_CLOUD_8:
1996 case IO_REPARSE_TAG_CLOUD_9:
1997 case IO_REPARSE_TAG_CLOUD_A:
1998 case IO_REPARSE_TAG_CLOUD_B:
1999 case IO_REPARSE_TAG_CLOUD_C:
2000 case IO_REPARSE_TAG_CLOUD_D:
2001 case IO_REPARSE_TAG_CLOUD_E:
2002 case IO_REPARSE_TAG_CLOUD_F:
2003 err = sizeof("OneDrive") - 1;
2004 if (err > buflen)
2005 err = buflen;
2006 memcpy(buffer, "OneDrive", err);
2007 goto out;
2008
2009 default:
2010 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2011 /* Unknown Microsoft Tag. */
2012 goto out;
2013 }
2014 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2015 size <= sizeof(struct REPARSE_POINT)) {
2016 goto out;
2017 }
2018
2019 /* Users tag. */
2020 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2021 ulen = le16_to_cpu(rp->ReparseDataLength) -
2022 sizeof(struct REPARSE_POINT);
2023 }
2024
2025 /* Convert nlen from bytes to UNICODE chars. */
2026 ulen >>= 1;
2027
2028 /* Check that name is available. */
2029 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2030 goto out;
2031
2032 /* If name is already zero terminated then truncate it now. */
2033 if (!uname[ulen - 1])
2034 ulen -= 1;
2035
2036 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2037
2038 if (err < 0)
2039 goto out;
2040
2041 /* Translate Windows '\' into Linux '/'. */
2042 for (i = 0; i < err; i++) {
2043 if (buffer[i] == '\\')
2044 buffer[i] = '/';
2045 }
2046
2047 /* Always set last zero. */
2048 buffer[err] = 0;
2049
2050 /* If this is a junction, translate the link target. */
2051 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2052 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2053
2054 out:
2055 kfree(to_free);
2056 return err;
2057 }
2058
ntfs_get_link(struct dentry * de,struct inode * inode,struct delayed_call * done)2059 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2060 struct delayed_call *done)
2061 {
2062 int err;
2063 char *ret;
2064
2065 if (!de)
2066 return ERR_PTR(-ECHILD);
2067
2068 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2069 if (!ret)
2070 return ERR_PTR(-ENOMEM);
2071
2072 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2073 if (err < 0) {
2074 kfree(ret);
2075 return ERR_PTR(err);
2076 }
2077
2078 set_delayed_call(done, kfree_link, ret);
2079
2080 return ret;
2081 }
2082
2083 // clang-format off
2084 const struct inode_operations ntfs_link_inode_operations = {
2085 .get_link = ntfs_get_link,
2086 .setattr = ntfs_setattr,
2087 .listxattr = ntfs_listxattr,
2088 };
2089
2090 const struct address_space_operations ntfs_aops = {
2091 .read_folio = ntfs_read_folio,
2092 .readahead = ntfs_readahead,
2093 .writepages = ntfs_writepages,
2094 .write_begin = ntfs_write_begin,
2095 .write_end = ntfs_write_end,
2096 .direct_IO = ntfs_direct_IO,
2097 .bmap = ntfs_bmap,
2098 .dirty_folio = block_dirty_folio,
2099 .migrate_folio = buffer_migrate_folio,
2100 .invalidate_folio = block_invalidate_folio,
2101 };
2102
2103 const struct address_space_operations ntfs_aops_cmpr = {
2104 .read_folio = ntfs_read_folio,
2105 .readahead = ntfs_readahead,
2106 .dirty_folio = block_dirty_folio,
2107 .direct_IO = ntfs_direct_IO,
2108 };
2109 // clang-format on
2110