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