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 #include <linux/iomap.h>
16
17 #include "debug.h"
18 #include "ntfs.h"
19 #include "ntfs_fs.h"
20
21 /*
22 * ntfs_read_mft - Read record and parse MFT.
23 */
ntfs_read_mft(struct inode * inode,const struct cpu_str * name,const struct MFT_REF * ref)24 static struct inode *ntfs_read_mft(struct inode *inode,
25 const struct cpu_str *name,
26 const struct MFT_REF *ref)
27 {
28 int err = 0;
29 struct ntfs_inode *ni = ntfs_i(inode);
30 struct super_block *sb = inode->i_sb;
31 struct ntfs_sb_info *sbi = sb->s_fs_info;
32 mode_t mode = 0;
33 struct ATTR_STD_INFO5 *std5 = NULL;
34 struct ATTR_LIST_ENTRY *le;
35 struct ATTRIB *attr;
36 bool is_match = false;
37 bool is_root = false;
38 bool is_dir;
39 unsigned long ino = inode->i_ino;
40 u32 rp_fa = 0, asize, t32;
41 u16 roff, rsize, names = 0, links = 0;
42 const struct ATTR_FILE_NAME *fname = NULL;
43 const struct INDEX_ROOT *root = NULL;
44 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
45 u64 t64;
46 struct MFT_REC *rec;
47 struct runs_tree *run;
48 struct timespec64 ts;
49
50 inode->i_op = NULL;
51 /* Setup 'uid' and 'gid' */
52 inode->i_uid = sbi->options->fs_uid;
53 inode->i_gid = sbi->options->fs_gid;
54
55 err = mi_init(&ni->mi, sbi, ino);
56 if (err)
57 goto out;
58
59 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
60 t64 = sbi->mft.lbo >> sbi->cluster_bits;
61 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
62 sbi->mft.ni = ni;
63 init_rwsem(&ni->file.run_lock);
64
65 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
66 err = -ENOMEM;
67 goto out;
68 }
69 }
70
71 err = mi_read(&ni->mi, ino == MFT_REC_MFT);
72
73 if (err)
74 goto out;
75
76 rec = ni->mi.mrec;
77
78 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
79 ;
80 } else if (ref->seq != rec->seq) {
81 err = -EINVAL;
82 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
83 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
84 goto out;
85 } else if (!is_rec_inuse(rec)) {
86 err = -ESTALE;
87 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
88 goto out;
89 }
90
91 if (le32_to_cpu(rec->total) != sbi->record_size) {
92 /* Bad inode? */
93 err = -EINVAL;
94 goto out;
95 }
96
97 if (!is_rec_base(rec)) {
98 err = -EINVAL;
99 goto out;
100 }
101
102 /* Record should contain $I30 root. */
103 is_dir = rec->flags & RECORD_FLAG_DIR;
104
105 /* MFT_REC_MFT is not a dir */
106 if (is_dir && ino == MFT_REC_MFT) {
107 err = -EINVAL;
108 goto out;
109 }
110
111 inode->i_generation = le16_to_cpu(rec->seq);
112
113 /* Enumerate all struct Attributes MFT. */
114 le = NULL;
115 attr = NULL;
116
117 /*
118 * To reduce tab pressure use goto instead of
119 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
120 */
121 next_attr:
122 run = NULL;
123 err = -EINVAL;
124 attr = ni_enum_attr_ex(ni, attr, &le, NULL);
125 if (!attr)
126 goto end_enum;
127
128 if (le && le->vcn) {
129 /* This is non primary attribute segment. Ignore if not MFT. */
130 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
131 goto next_attr;
132
133 run = &ni->file.run;
134 asize = le32_to_cpu(attr->size);
135 goto attr_unpack_run;
136 }
137
138 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
139 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
140 asize = le32_to_cpu(attr->size);
141
142 /*
143 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'.
144 * There not critical to check this case again
145 */
146 if (attr->name_len &&
147 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) >
148 asize)
149 goto out;
150
151 if (attr->non_res) {
152 t64 = le64_to_cpu(attr->nres.alloc_size);
153 if (le64_to_cpu(attr->nres.data_size) > t64 ||
154 le64_to_cpu(attr->nres.valid_size) > t64)
155 goto out;
156 }
157
158 switch (attr->type) {
159 case ATTR_STD:
160 if (attr->non_res ||
161 asize < sizeof(struct ATTR_STD_INFO) + roff ||
162 rsize < sizeof(struct ATTR_STD_INFO))
163 goto out;
164
165 if (std5)
166 goto next_attr;
167
168 std5 = Add2Ptr(attr, roff);
169
170 nt2kernel(std5->cr_time, &ni->i_crtime);
171 nt2kernel(std5->a_time, &ts);
172 inode_set_atime_to_ts(inode, ts);
173 nt2kernel(std5->c_time, &ts);
174 inode_set_ctime_to_ts(inode, ts);
175 nt2kernel(std5->m_time, &ts);
176 inode_set_mtime_to_ts(inode, ts);
177
178 ni->std_fa = std5->fa;
179
180 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
181 rsize >= sizeof(struct ATTR_STD_INFO5))
182 ni->std_security_id = std5->security_id;
183 goto next_attr;
184
185 case ATTR_LIST:
186 if (attr->name_len || le || ino == MFT_REC_LOG)
187 goto out;
188
189 err = ntfs_load_attr_list(ni, attr);
190 if (err)
191 goto out;
192
193 le = NULL;
194 attr = NULL;
195 goto next_attr;
196
197 case ATTR_NAME:
198 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
199 rsize < SIZEOF_ATTRIBUTE_FILENAME)
200 goto out;
201
202 names += 1;
203 fname = Add2Ptr(attr, roff);
204 if (fname->type == FILE_NAME_DOS)
205 goto next_attr;
206
207 links += 1;
208 if (name && name->len == fname->name_len &&
209 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
210 NULL, false))
211 is_match = true;
212
213 goto next_attr;
214
215 case ATTR_DATA:
216 if (is_dir) {
217 /* Ignore data attribute in dir record. */
218 goto next_attr;
219 }
220
221 if (ino == MFT_REC_BADCLUST && !attr->non_res)
222 goto next_attr;
223
224 if (attr->name_len &&
225 ((ino != MFT_REC_BADCLUST || !attr->non_res ||
226 attr->name_len != ARRAY_SIZE(BAD_NAME) ||
227 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
228 (ino != MFT_REC_SECURE || !attr->non_res ||
229 attr->name_len != ARRAY_SIZE(SDS_NAME) ||
230 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
231 /* File contains stream attribute. Ignore it. */
232 goto next_attr;
233 }
234
235 if (is_attr_sparsed(attr))
236 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
237 else
238 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
239
240 if (is_attr_compressed(attr))
241 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
242 else
243 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
244
245 if (is_attr_encrypted(attr))
246 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
247 else
248 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
249
250 if (!attr->non_res) {
251 ni->i_valid = inode->i_size = rsize;
252 inode_set_bytes(inode, rsize);
253 }
254
255 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
256
257 if (!attr->non_res) {
258 ni->ni_flags |= NI_FLAG_RESIDENT;
259 goto next_attr;
260 }
261
262 inode_set_bytes(inode, attr_ondisk_size(attr));
263
264 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
265 inode->i_size = le64_to_cpu(attr->nres.data_size);
266 if (!attr->nres.alloc_size)
267 goto next_attr;
268
269 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
270 &ni->file.run;
271 break;
272
273 case ATTR_ROOT:
274 if (attr->non_res)
275 goto out;
276
277 root = Add2Ptr(attr, roff);
278
279 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
280 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
281 goto next_attr;
282
283 if (root->type != ATTR_NAME ||
284 root->rule != NTFS_COLLATION_TYPE_FILENAME)
285 goto out;
286
287 if (!is_dir)
288 goto next_attr;
289
290 is_root = true;
291 ni->ni_flags |= NI_FLAG_DIR;
292
293 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
294 if (err)
295 goto out;
296
297 mode = sb->s_root ?
298 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
299 (S_IFDIR | 0777);
300 goto next_attr;
301
302 case ATTR_ALLOC:
303 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
304 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
305 goto next_attr;
306
307 inode->i_size = le64_to_cpu(attr->nres.data_size);
308 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
309 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
310
311 run = &ni->dir.alloc_run;
312 break;
313
314 case ATTR_BITMAP:
315 if (ino == MFT_REC_MFT) {
316 if (!attr->non_res)
317 goto out;
318 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
319 /* 0x20000000 = 2^32 / 8 */
320 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
321 goto out;
322 #endif
323 run = &sbi->mft.bitmap.run;
324 break;
325 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
326 !memcmp(attr_name(attr), I30_NAME,
327 sizeof(I30_NAME)) &&
328 attr->non_res) {
329 run = &ni->dir.bitmap_run;
330 break;
331 }
332 goto next_attr;
333
334 case ATTR_REPARSE:
335 if (attr->name_len)
336 goto next_attr;
337
338 rp_fa = ni_parse_reparse(ni, attr, &rp);
339 switch (rp_fa) {
340 case REPARSE_LINK:
341 /*
342 * Normal symlink.
343 * Assume one unicode symbol == one utf8.
344 */
345 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
346 .PrintNameLength) /
347 sizeof(u16);
348 ni->i_valid = inode->i_size;
349 /* Clear directory bit. */
350 if (ni->ni_flags & NI_FLAG_DIR) {
351 indx_clear(&ni->dir);
352 memset(&ni->dir, 0, sizeof(ni->dir));
353 ni->ni_flags &= ~NI_FLAG_DIR;
354 } else {
355 run_close(&ni->file.run);
356 }
357 mode = S_IFLNK | 0777;
358 is_dir = false;
359 if (attr->non_res) {
360 run = &ni->file.run;
361 goto attr_unpack_run; // Double break.
362 }
363 break;
364
365 case REPARSE_COMPRESSED:
366 break;
367
368 case REPARSE_DEDUPLICATED:
369 break;
370 }
371 goto next_attr;
372
373 case ATTR_EA_INFO:
374 if (!attr->name_len &&
375 resident_data_ex(attr, sizeof(struct EA_INFO))) {
376 ni->ni_flags |= NI_FLAG_EA;
377 /*
378 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
379 */
380 inode->i_mode = mode;
381 ntfs_get_wsl_perm(inode);
382 mode = inode->i_mode;
383 }
384 goto next_attr;
385
386 default:
387 goto next_attr;
388 }
389
390 attr_unpack_run:
391 roff = le16_to_cpu(attr->nres.run_off);
392
393 if (roff > asize) {
394 err = -EINVAL;
395 goto out;
396 }
397
398 t64 = le64_to_cpu(attr->nres.svcn);
399
400 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
401 t64, Add2Ptr(attr, roff), asize - roff);
402 if (err < 0)
403 goto out;
404 err = 0;
405 goto next_attr;
406
407 end_enum:
408
409 if (!std5)
410 goto out;
411
412 if (is_bad_inode(inode))
413 goto out;
414
415 if (!is_match && name) {
416 err = -ENOENT;
417 goto out;
418 }
419
420 if (std5->fa & FILE_ATTRIBUTE_READONLY)
421 mode &= ~0222;
422
423 if (!names) {
424 err = -EINVAL;
425 goto out;
426 }
427
428 if (names != le16_to_cpu(rec->hard_links)) {
429 /* Correct minor error on the fly. Do not mark inode as dirty. */
430 ntfs_inode_warn(inode, "Correct links count -> %u.", names);
431 rec->hard_links = cpu_to_le16(names);
432 ni->mi.dirty = true;
433 }
434
435 set_nlink(inode, links);
436
437 if (S_ISDIR(mode)) {
438 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
439
440 /*
441 * Dot and dot-dot should be included in count but was not
442 * included in enumeration.
443 * Usually a hard links to directories are disabled.
444 */
445 inode->i_op = &ntfs_dir_inode_operations;
446 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
447 &ntfs_legacy_dir_operations :
448 &ntfs_dir_operations;
449 ni->i_valid = 0;
450 } else if (S_ISLNK(mode)) {
451 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
452 inode->i_op = &ntfs_link_inode_operations;
453 inode->i_fop = NULL;
454 inode_nohighmem(inode);
455 } else if (S_ISREG(mode)) {
456 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
457 inode->i_op = &ntfs_file_inode_operations;
458 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
459 &ntfs_legacy_file_operations :
460 &ntfs_file_operations;
461 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
462 &ntfs_aops;
463 if (ino != MFT_REC_MFT)
464 init_rwsem(&ni->file.run_lock);
465 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
466 S_ISSOCK(mode)) {
467 inode->i_op = &ntfs_special_inode_operations;
468 init_special_inode(inode, mode, inode->i_rdev);
469 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
470 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
471 /* Records in $Extend are not a files or general directories. */
472 inode->i_op = &ntfs_file_inode_operations;
473 mode = S_IFREG;
474 init_rwsem(&ni->file.run_lock);
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_state_read_once(inode) & 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
ntfs_bmap(struct address_space * mapping,sector_t block)557 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
558 {
559 struct inode *inode = mapping->host;
560 struct ntfs_inode *ni = ntfs_i(inode);
561
562 /*
563 * We can get here for an inline file via the FIBMAP ioctl
564 */
565 if (is_resident(ni))
566 return 0;
567
568 if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY) &&
569 !run_is_empty(&ni->file.run_da)) {
570 /*
571 * With delalloc data we want to sync the file so
572 * that we can make sure we allocate blocks for file and data
573 * is in place for the user to see it
574 */
575 ni_allocate_da_blocks(ni);
576 }
577
578 return iomap_bmap(mapping, block, &ntfs_iomap_ops);
579 }
580
ntfs_iomap_read_end_io(struct bio * bio)581 static void ntfs_iomap_read_end_io(struct bio *bio)
582 {
583 int error = blk_status_to_errno(bio->bi_status);
584 struct folio_iter fi;
585
586 bio_for_each_folio_all(fi, bio) {
587 struct folio *folio = fi.folio;
588 struct inode *inode = folio->mapping->host;
589 struct ntfs_inode *ni = ntfs_i(inode);
590 u64 valid = ni->i_valid;
591 u32 f_size = folio_size(folio);
592 loff_t f_pos = folio_pos(folio);
593
594
595 if (valid < f_pos + f_size) {
596 u32 z_from = valid <= f_pos ?
597 0 :
598 offset_in_folio(folio, valid);
599 /* The only thing ntfs_iomap_read_end_io used for. */
600 folio_zero_segment(folio, z_from, f_size);
601 }
602
603 iomap_finish_folio_read(folio, fi.offset, fi.length, error);
604 }
605 bio_put(bio);
606 }
607
ntfs_iomap_bio_submit_read(const struct iomap_iter * iter,struct iomap_read_folio_ctx * ctx)608 static void ntfs_iomap_bio_submit_read(const struct iomap_iter *iter,
609 struct iomap_read_folio_ctx *ctx)
610 {
611 struct bio *bio = ctx->read_ctx;
612
613 bio->bi_end_io = ntfs_iomap_read_end_io;
614 submit_bio(bio);
615 }
616
617 static const struct iomap_read_ops ntfs_iomap_bio_read_ops = {
618 .read_folio_range = iomap_bio_read_folio_range,
619 .submit_read = ntfs_iomap_bio_submit_read,
620 };
621
ntfs_read_folio(struct file * file,struct folio * folio)622 static int ntfs_read_folio(struct file *file, struct folio *folio)
623 {
624 int err;
625 struct address_space *mapping = folio->mapping;
626 struct inode *inode = mapping->host;
627 struct ntfs_inode *ni = ntfs_i(inode);
628 loff_t vbo = folio_pos(folio);
629 struct iomap_read_folio_ctx ctx = {
630 .cur_folio = folio,
631 .ops = &ntfs_iomap_bio_read_ops,
632 };
633
634 if (unlikely(is_bad_ni(ni))) {
635 folio_unlock(folio);
636 return -EIO;
637 }
638
639 if (ni->i_valid <= vbo) {
640 folio_zero_range(folio, 0, folio_size(folio));
641 folio_mark_uptodate(folio);
642 folio_unlock(folio);
643 return 0;
644 }
645
646 if (is_compressed(ni)) {
647 /* ni_lock is taken inside ni_read_folio_cmpr after page locks */
648 err = ni_read_folio_cmpr(ni, folio);
649 return err;
650 }
651
652 iomap_read_folio(&ntfs_iomap_ops, &ctx, NULL);
653 return 0;
654 }
655
ntfs_readahead(struct readahead_control * rac)656 static void ntfs_readahead(struct readahead_control *rac)
657 {
658 struct address_space *mapping = rac->mapping;
659 struct inode *inode = mapping->host;
660 struct ntfs_inode *ni = ntfs_i(inode);
661 struct iomap_read_folio_ctx ctx = {
662 .ops = &ntfs_iomap_bio_read_ops,
663 .rac = rac,
664 };
665
666 if (is_resident(ni)) {
667 /* No readahead for resident. */
668 return;
669 }
670
671 if (is_compressed(ni)) {
672 /* No readahead for compressed. */
673 return;
674 }
675
676 iomap_readahead(&ntfs_iomap_ops, &ctx, NULL);
677 }
678
ntfs_set_size(struct inode * inode,u64 new_size)679 int ntfs_set_size(struct inode *inode, u64 new_size)
680 {
681 struct super_block *sb = inode->i_sb;
682 struct ntfs_sb_info *sbi = sb->s_fs_info;
683 struct ntfs_inode *ni = ntfs_i(inode);
684 int err;
685
686 /* Check for maximum file size. */
687 if (is_sparsed(ni) || is_compressed(ni)) {
688 if (new_size > sbi->maxbytes_sparse) {
689 return -EFBIG;
690 }
691 } else if (new_size > sbi->maxbytes) {
692 return -EFBIG;
693 }
694
695 ni_lock(ni);
696 down_write(&ni->file.run_lock);
697
698 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
699 &ni->i_valid, true);
700
701 if (!err) {
702 i_size_write(inode, new_size);
703 mark_inode_dirty(inode);
704 }
705
706 up_write(&ni->file.run_lock);
707 ni_unlock(ni);
708
709 return err;
710 }
711
712 /*
713 * Special value to detect ntfs_writeback_range call
714 */
715 #define WB_NO_DA (struct iomap *)1
716 /*
717 * Function to get mapping vbo -> lbo.
718 * used with:
719 * - iomap_zero_range
720 * - iomap_truncate_page
721 * - iomap_dio_rw
722 * - iomap_file_buffered_write
723 * - iomap_bmap
724 * - iomap_fiemap
725 * - iomap_bio_read_folio
726 * - iomap_bio_readahead
727 */
ntfs_iomap_begin(struct inode * inode,loff_t offset,loff_t length,unsigned int flags,struct iomap * iomap,struct iomap * srcmap)728 static int ntfs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
729 unsigned int flags, struct iomap *iomap,
730 struct iomap *srcmap)
731 {
732 struct ntfs_inode *ni = ntfs_i(inode);
733 struct ntfs_sb_info *sbi = ni->mi.sbi;
734 u8 cluster_bits = sbi->cluster_bits;
735 CLST vcn = offset >> cluster_bits;
736 u32 off = offset & sbi->cluster_mask;
737 bool rw = flags & IOMAP_WRITE;
738 loff_t endbyte = offset + length;
739 void *res = NULL;
740 int err;
741 CLST lcn, clen, clen_max = 1;
742 bool new_clst = false;
743 bool no_da;
744 bool zero = false;
745 if (unlikely(ntfs3_forced_shutdown(sbi->sb)))
746 return -EIO;
747
748 if (flags & IOMAP_REPORT) {
749 if (offset > ntfs_get_maxbytes(ni)) {
750 /* called from fiemap/bmap. */
751 return -EINVAL;
752 }
753
754 if (offset >= inode->i_size) {
755 /* special code for report. */
756 return -ENOENT;
757 }
758 }
759
760 if (IOMAP_ZERO == flags && (endbyte & sbi->cluster_mask)) {
761 rw = true;
762 } else if (rw) {
763 clen_max = bytes_to_cluster(sbi, endbyte) - vcn;
764 }
765
766 /*
767 * Force to allocate clusters if directIO(write) or writeback_range.
768 * NOTE: attr_data_get_block allocates clusters only for sparse file.
769 * Normal file allocates clusters in attr_set_size.
770 */
771 no_da = flags == (IOMAP_DIRECT | IOMAP_WRITE) || srcmap == WB_NO_DA;
772
773 err = attr_data_get_block(ni, vcn, clen_max, &lcn, &clen,
774 rw ? &new_clst : NULL, zero, &res, no_da);
775
776 if (err) {
777 return err;
778 }
779
780 if (lcn == EOF_LCN) {
781 /* request out of file. */
782 if (flags & IOMAP_REPORT) {
783 /* special code for report. */
784 return -ENOENT;
785 }
786
787 if (rw) {
788 /* should never be here. */
789 return -EINVAL;
790 }
791 lcn = SPARSE_LCN;
792 }
793
794 iomap->flags = new_clst ? IOMAP_F_NEW : 0;
795
796 if (lcn == RESIDENT_LCN) {
797 if (offset >= clen) {
798 kfree(res);
799 if (flags & IOMAP_REPORT) {
800 /* special code for report. */
801 return -ENOENT;
802 }
803 return -EFAULT;
804 }
805
806 iomap->private = iomap->inline_data = res;
807 iomap->type = IOMAP_INLINE;
808 iomap->offset = 0;
809 iomap->length = clen; /* resident size in bytes. */
810 return 0;
811 }
812
813 if (!clen) {
814 /* broken file? */
815 return -EINVAL;
816 }
817
818 iomap->bdev = inode->i_sb->s_bdev;
819 iomap->offset = offset;
820 iomap->length = ((loff_t)clen << cluster_bits) - off;
821
822 if (lcn == COMPRESSED_LCN) {
823 /* should never be here. */
824 return -EOPNOTSUPP;
825 }
826
827 if (lcn == DELALLOC_LCN) {
828 iomap->type = IOMAP_DELALLOC;
829 iomap->addr = IOMAP_NULL_ADDR;
830 } else {
831
832 /* Translate clusters into bytes. */
833 iomap->addr = ((loff_t)lcn << cluster_bits) + off;
834 if (length && iomap->length > length)
835 iomap->length = length;
836 else
837 endbyte = offset + iomap->length;
838
839 if (lcn == SPARSE_LCN) {
840 iomap->addr = IOMAP_NULL_ADDR;
841 iomap->type = IOMAP_HOLE;
842 // if (IOMAP_ZERO == flags && !off) {
843 // iomap->length = (endbyte - offset) &
844 // sbi->cluster_mask_inv;
845 // }
846 } else if (endbyte <= ni->i_valid) {
847 iomap->type = IOMAP_MAPPED;
848 } else if (offset < ni->i_valid) {
849 iomap->type = IOMAP_MAPPED;
850 if (flags & IOMAP_REPORT)
851 iomap->length = ni->i_valid - offset;
852 } else if (rw || (flags & IOMAP_ZERO)) {
853 iomap->type = IOMAP_MAPPED;
854 } else {
855 iomap->type = IOMAP_UNWRITTEN;
856 }
857 }
858
859 if ((flags & IOMAP_ZERO) &&
860 (iomap->type == IOMAP_MAPPED || iomap->type == IOMAP_DELALLOC)) {
861 /* Avoid too large requests. */
862 u32 tail;
863 u32 off_a = offset & (PAGE_SIZE - 1);
864 if (off_a)
865 tail = PAGE_SIZE - off_a;
866 else
867 tail = PAGE_SIZE;
868
869 if (iomap->length > tail)
870 iomap->length = tail;
871 }
872
873 return 0;
874 }
875
ntfs_iomap_end(struct inode * inode,loff_t pos,loff_t length,ssize_t written,unsigned int flags,struct iomap * iomap)876 static int ntfs_iomap_end(struct inode *inode, loff_t pos, loff_t length,
877 ssize_t written, unsigned int flags,
878 struct iomap *iomap)
879 {
880 int err = 0;
881 struct ntfs_inode *ni = ntfs_i(inode);
882 loff_t endbyte = pos + written;
883
884 if ((flags & IOMAP_WRITE) || (flags & IOMAP_ZERO)) {
885 if (iomap->type == IOMAP_INLINE) {
886 u32 data_size;
887 struct ATTRIB *attr;
888 struct mft_inode *mi;
889
890 attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0,
891 NULL, &mi);
892 if (!attr || attr->non_res) {
893 err = -EINVAL;
894 goto out;
895 }
896
897 data_size = le32_to_cpu(attr->res.data_size);
898 if (!(pos < data_size && endbyte <= data_size)) {
899 err = -EINVAL;
900 goto out;
901 }
902
903 /* Update resident data. */
904 memcpy(resident_data(attr) + pos,
905 iomap_inline_data(iomap, pos), written);
906 mi->dirty = true;
907 ni->i_valid = data_size;
908 } else if (ni->i_valid < endbyte) {
909 ni->i_valid = endbyte;
910 mark_inode_dirty(inode);
911 }
912 }
913
914 if ((flags & IOMAP_ZERO) &&
915 (iomap->type == IOMAP_MAPPED || iomap->type == IOMAP_DELALLOC)) {
916 /* Pair for code in ntfs_iomap_begin. */
917 balance_dirty_pages_ratelimited(inode->i_mapping);
918 cond_resched();
919 }
920
921 out:
922 if (iomap->type == IOMAP_INLINE) {
923 kfree(iomap->private);
924 iomap->private = NULL;
925 }
926
927 return err;
928 }
929
930 /*
931 * write_begin + put_folio + write_end.
932 * iomap_zero_range
933 * iomap_truncate_page
934 * iomap_file_buffered_write
935 */
ntfs_iomap_put_folio(struct inode * inode,loff_t pos,unsigned int len,struct folio * folio)936 static void ntfs_iomap_put_folio(struct inode *inode, loff_t pos,
937 unsigned int len, struct folio *folio)
938 {
939 struct ntfs_inode *ni = ntfs_i(inode);
940 loff_t end = pos + len;
941 u32 f_size = folio_size(folio);
942 loff_t f_pos = folio_pos(folio);
943 loff_t f_end = f_pos + f_size;
944
945 if (ni->i_valid <= end && end < f_end) {
946 /* zero range [end - f_end). */
947 /* The only thing ntfs_iomap_put_folio used for. */
948 folio_zero_segment(folio, offset_in_folio(folio, end), f_size);
949 }
950 folio_unlock(folio);
951 folio_put(folio);
952 }
953
954 /*
955 * iomap_writeback_ops::writeback_range
956 */
ntfs_writeback_range(struct iomap_writepage_ctx * wpc,struct folio * folio,u64 offset,unsigned int len,u64 end_pos)957 static ssize_t ntfs_writeback_range(struct iomap_writepage_ctx *wpc,
958 struct folio *folio, u64 offset,
959 unsigned int len, u64 end_pos)
960 {
961 struct iomap *iomap = &wpc->iomap;
962 /* Check iomap position. */
963 if (iomap->offset + iomap->length <= offset || offset < iomap->offset) {
964 int err;
965 struct inode *inode = wpc->inode;
966 struct ntfs_inode *ni = ntfs_i(inode);
967 struct ntfs_sb_info *sbi = ntfs_sb(inode->i_sb);
968 loff_t i_size_up = ntfs_up_cluster(sbi, inode->i_size);
969 loff_t len_max = i_size_up - offset;
970
971 err = ni->file.run_da.count ? ni_allocate_da_blocks(ni) : 0;
972
973 if (!err) {
974 /* Use local special value 'WB_NO_DA' to disable delalloc. */
975 err = ntfs_iomap_begin(inode, offset, len_max,
976 IOMAP_WRITE, iomap, WB_NO_DA);
977 }
978
979 if (err) {
980 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
981 return err;
982 }
983 }
984
985 return iomap_add_to_ioend(wpc, folio, offset, end_pos, len);
986 }
987
988
989 static const struct iomap_writeback_ops ntfs_writeback_ops = {
990 .writeback_range = ntfs_writeback_range,
991 .writeback_submit = iomap_ioend_writeback_submit,
992 };
993
ntfs_resident_writepage(struct folio * folio,struct writeback_control * wbc)994 static int ntfs_resident_writepage(struct folio *folio,
995 struct writeback_control *wbc)
996 {
997 struct address_space *mapping = folio->mapping;
998 struct inode *inode = mapping->host;
999 struct ntfs_inode *ni = ntfs_i(inode);
1000 int ret;
1001
1002 /* Avoid any operation if inode is bad. */
1003 if (unlikely(is_bad_ni(ni)))
1004 return -EINVAL;
1005
1006 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
1007 return -EIO;
1008
1009 ni_lock(ni);
1010 ret = attr_data_write_resident(ni, folio);
1011 ni_unlock(ni);
1012
1013 if (ret != E_NTFS_NONRESIDENT)
1014 folio_unlock(folio);
1015 mapping_set_error(mapping, ret);
1016 return ret;
1017 }
1018
ntfs_writepages(struct address_space * mapping,struct writeback_control * wbc)1019 static int ntfs_writepages(struct address_space *mapping,
1020 struct writeback_control *wbc)
1021 {
1022 int err;
1023 struct inode *inode = mapping->host;
1024 struct ntfs_inode *ni = ntfs_i(inode);
1025 struct iomap_writepage_ctx wpc = {
1026 .inode = mapping->host,
1027 .wbc = wbc,
1028 .ops = &ntfs_writeback_ops,
1029 };
1030
1031 /* Avoid any operation if inode is bad. */
1032 if (unlikely(is_bad_ni(ni)))
1033 return -EINVAL;
1034
1035 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
1036 return -EIO;
1037
1038 if (is_resident(ni)) {
1039 struct folio *folio = NULL;
1040
1041 while ((folio = writeback_iter(mapping, wbc, folio, &err)))
1042 err = ntfs_resident_writepage(folio, wbc);
1043
1044 return err;
1045 }
1046
1047 return iomap_writepages(&wpc);
1048 }
1049
ntfs3_write_inode(struct inode * inode,struct writeback_control * wbc)1050 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1051 {
1052 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1053 }
1054
ntfs_sync_inode(struct inode * inode)1055 int ntfs_sync_inode(struct inode *inode)
1056 {
1057 return _ni_write_inode(inode, 1);
1058 }
1059
1060 /*
1061 * Helper function to read file.
1062 * Used to read $AttrDef and $UpCase
1063 */
inode_read_data(struct inode * inode,void * data,size_t bytes)1064 int inode_read_data(struct inode *inode, void *data, size_t bytes)
1065 {
1066 pgoff_t idx;
1067 struct address_space *mapping = inode->i_mapping;
1068
1069 for (idx = 0; bytes; idx++) {
1070 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1071 struct page *page = read_mapping_page(mapping, idx, NULL);
1072 void *kaddr;
1073
1074 if (IS_ERR(page))
1075 return PTR_ERR(page);
1076
1077 kaddr = kmap_atomic(page);
1078 memcpy(data, kaddr, op);
1079 kunmap_atomic(kaddr);
1080
1081 put_page(page);
1082
1083 bytes -= op;
1084 data = Add2Ptr(data, PAGE_SIZE);
1085 }
1086 return 0;
1087 }
1088
1089 /*
1090 * ntfs_reparse_bytes
1091 *
1092 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1093 * for unicode string of @uni_len length.
1094 */
ntfs_reparse_bytes(u32 uni_len,bool is_absolute)1095 static inline u32 ntfs_reparse_bytes(u32 uni_len, bool is_absolute)
1096 {
1097 /* Header + unicode string + decorated unicode string. */
1098 return sizeof(short) * (2 * uni_len + (is_absolute ? 4 : 0)) +
1099 offsetof(struct REPARSE_DATA_BUFFER,
1100 SymbolicLinkReparseBuffer.PathBuffer);
1101 }
1102
1103 static struct REPARSE_DATA_BUFFER *
ntfs_create_reparse_buffer(struct ntfs_sb_info * sbi,const char * symname,u32 size,u16 * nsize)1104 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1105 u32 size, u16 *nsize)
1106 {
1107 int i, err;
1108 struct REPARSE_DATA_BUFFER *rp;
1109 __le16 *rp_name;
1110 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1111 bool is_absolute;
1112
1113 is_absolute = symname[0] && symname[1] == ':';
1114
1115 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2, is_absolute), 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, is_absolute);
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 =
1151 cpu_to_le16(sizeof(short) * err + (is_absolute ? 8 : 0));
1152 rs->PrintNameLength = rs->SubstituteNameOffset;
1153
1154 /*
1155 * TODO: Use relative path if possible to allow Windows to
1156 * parse this path.
1157 * 0-absolute path, 1- relative path (SYMLINK_FLAG_RELATIVE).
1158 */
1159 rs->Flags = cpu_to_le32(is_absolute ? 0 : SYMLINK_FLAG_RELATIVE);
1160
1161 memmove(rp_name + err + (is_absolute ? 4 : 0), rp_name,
1162 sizeof(short) * err);
1163
1164 if (is_absolute) {
1165 /* Decorate SubstituteName. */
1166 rp_name += err;
1167 rp_name[0] = cpu_to_le16('\\');
1168 rp_name[1] = cpu_to_le16('?');
1169 rp_name[2] = cpu_to_le16('?');
1170 rp_name[3] = cpu_to_le16('\\');
1171 }
1172
1173 return rp;
1174 out:
1175 kfree(rp);
1176 return ERR_PTR(err);
1177 }
1178
1179 /*
1180 * ntfs_create_inode
1181 *
1182 * Helper function for:
1183 * - ntfs_create
1184 * - ntfs_mknod
1185 * - ntfs_symlink
1186 * - ntfs_mkdir
1187 * - ntfs_atomic_open
1188 *
1189 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1190 */
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)1191 int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1192 struct dentry *dentry, const struct cpu_str *uni,
1193 umode_t mode, dev_t dev, const char *symname, u32 size,
1194 struct ntfs_fnd *fnd)
1195 {
1196 int err;
1197 struct super_block *sb = dir->i_sb;
1198 struct ntfs_sb_info *sbi = sb->s_fs_info;
1199 const struct qstr *name = &dentry->d_name;
1200 CLST ino = 0;
1201 struct ntfs_inode *dir_ni = ntfs_i(dir);
1202 struct ntfs_inode *ni = NULL;
1203 struct inode *inode = NULL;
1204 struct ATTRIB *attr;
1205 struct ATTR_STD_INFO5 *std5;
1206 struct ATTR_FILE_NAME *fname;
1207 struct MFT_REC *rec;
1208 u32 asize, dsize, sd_size;
1209 enum FILE_ATTRIBUTE fa;
1210 __le32 security_id = SECURITY_ID_INVALID;
1211 CLST vcn;
1212 const void *sd;
1213 u16 t16, nsize = 0, aid = 0;
1214 struct INDEX_ROOT *root, *dir_root;
1215 struct NTFS_DE *e, *new_de = NULL;
1216 struct REPARSE_DATA_BUFFER *rp = NULL;
1217 bool rp_inserted = false;
1218
1219 /* New file will be resident or non resident. */
1220 const bool new_file_resident = 1;
1221
1222 if (!fnd)
1223 ni_lock_dir(dir_ni);
1224
1225 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1226 if (!dir_root) {
1227 err = -EINVAL;
1228 goto out1;
1229 }
1230
1231 if (S_ISDIR(mode)) {
1232 /* Use parent's directory attributes. */
1233 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1234 FILE_ATTRIBUTE_ARCHIVE;
1235 /*
1236 * By default child directory inherits parent attributes.
1237 * Root directory is hidden + system.
1238 * Make an exception for children in root.
1239 */
1240 if (dir->i_ino == MFT_REC_ROOT)
1241 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1242 } else if (S_ISLNK(mode)) {
1243 /* It is good idea that link should be the same type (file/dir) as target */
1244 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1245
1246 /*
1247 * Linux: there are dir/file/symlink and so on.
1248 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1249 * It is good idea to create:
1250 * dir + reparse if 'symname' points to directory
1251 * or
1252 * file + reparse if 'symname' points to file
1253 * Unfortunately kern_path hangs if symname contains 'dir'.
1254 */
1255
1256 /*
1257 * struct path path;
1258 *
1259 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1260 * struct inode *target = d_inode(path.dentry);
1261 *
1262 * if (S_ISDIR(target->i_mode))
1263 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1264 * // if ( target->i_sb == sb ){
1265 * // use relative path?
1266 * // }
1267 * path_put(&path);
1268 * }
1269 */
1270 } else if (S_ISREG(mode)) {
1271 if (sbi->options->sparse) {
1272 /* Sparsed regular file, cause option 'sparse'. */
1273 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1274 FILE_ATTRIBUTE_ARCHIVE;
1275 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1276 /* Compressed regular file, if parent is compressed. */
1277 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1278 } else {
1279 /* Regular file, default attributes. */
1280 fa = FILE_ATTRIBUTE_ARCHIVE;
1281 }
1282 } else {
1283 fa = FILE_ATTRIBUTE_ARCHIVE;
1284 }
1285
1286 /* If option "hide_dot_files" then set hidden attribute for dot files. */
1287 if (sbi->options->hide_dot_files && name->name[0] == '.')
1288 fa |= FILE_ATTRIBUTE_HIDDEN;
1289
1290 if (!(mode & 0222))
1291 fa |= FILE_ATTRIBUTE_READONLY;
1292
1293 /* Allocate PATH_MAX bytes. */
1294 new_de = kzalloc(PATH_MAX, GFP_KERNEL);
1295 if (!new_de) {
1296 err = -ENOMEM;
1297 goto out1;
1298 }
1299
1300 /* Avoid any operation if inode is bad. */
1301 if (unlikely(is_bad_ni(dir_ni))) {
1302 err = -EINVAL;
1303 goto out2;
1304 }
1305
1306 if (unlikely(ntfs3_forced_shutdown(sb))) {
1307 err = -EIO;
1308 goto out2;
1309 }
1310
1311 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1312 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1313
1314 /* Step 1: allocate and fill new mft record. */
1315 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1316 if (err)
1317 goto out2;
1318
1319 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1320 if (IS_ERR(ni)) {
1321 err = PTR_ERR(ni);
1322 ni = NULL;
1323 goto out3;
1324 }
1325 inode = &ni->vfs_inode;
1326 inode_init_owner(idmap, inode, dir, mode);
1327 mode = inode->i_mode;
1328
1329 ni->i_crtime = current_time(inode);
1330
1331 rec = ni->mi.mrec;
1332 rec->hard_links = cpu_to_le16(1);
1333 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1334
1335 /* Get default security id. */
1336 sd = s_default_security;
1337 sd_size = sizeof(s_default_security);
1338
1339 if (is_ntfs3(sbi)) {
1340 security_id = dir_ni->std_security_id;
1341 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1342 security_id = sbi->security.def_security_id;
1343
1344 if (security_id == SECURITY_ID_INVALID &&
1345 !ntfs_insert_security(sbi, sd, sd_size,
1346 &security_id, NULL))
1347 sbi->security.def_security_id = security_id;
1348 }
1349 }
1350
1351 /* Insert standard info. */
1352 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1353
1354 if (security_id == SECURITY_ID_INVALID) {
1355 dsize = sizeof(struct ATTR_STD_INFO);
1356 } else {
1357 dsize = sizeof(struct ATTR_STD_INFO5);
1358 std5->security_id = security_id;
1359 ni->std_security_id = security_id;
1360 }
1361 asize = SIZEOF_RESIDENT + dsize;
1362
1363 attr->type = ATTR_STD;
1364 attr->size = cpu_to_le32(asize);
1365 attr->id = cpu_to_le16(aid++);
1366 attr->res.data_off = SIZEOF_RESIDENT_LE;
1367 attr->res.data_size = cpu_to_le32(dsize);
1368
1369 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1370 kernel2nt(&ni->i_crtime);
1371
1372 std5->fa = ni->std_fa = fa;
1373
1374 attr = Add2Ptr(attr, asize);
1375
1376 /* Insert file name. */
1377 err = fill_name_de(sbi, new_de, name, uni);
1378 if (err)
1379 goto out4;
1380
1381 mi_get_ref(&ni->mi, &new_de->ref);
1382
1383 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1384
1385 if (sbi->options->windows_names &&
1386 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1387 err = -EINVAL;
1388 goto out4;
1389 }
1390
1391 mi_get_ref(&dir_ni->mi, &fname->home);
1392 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1393 fname->dup.a_time = std5->cr_time;
1394 fname->dup.alloc_size = fname->dup.data_size = 0;
1395 fname->dup.fa = std5->fa;
1396 fname->dup.extend_data = S_ISLNK(mode) ? IO_REPARSE_TAG_SYMLINK : 0;
1397
1398 dsize = le16_to_cpu(new_de->key_size);
1399 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1400
1401 attr->type = ATTR_NAME;
1402 attr->size = cpu_to_le32(asize);
1403 attr->res.data_off = SIZEOF_RESIDENT_LE;
1404 attr->res.flags = RESIDENT_FLAG_INDEXED;
1405 attr->id = cpu_to_le16(aid++);
1406 attr->res.data_size = cpu_to_le32(dsize);
1407 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1408
1409 attr = Add2Ptr(attr, asize);
1410
1411 if (security_id == SECURITY_ID_INVALID) {
1412 /* Insert security attribute. */
1413 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1414
1415 attr->type = ATTR_SECURE;
1416 attr->size = cpu_to_le32(asize);
1417 attr->id = cpu_to_le16(aid++);
1418 attr->res.data_off = SIZEOF_RESIDENT_LE;
1419 attr->res.data_size = cpu_to_le32(sd_size);
1420 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1421
1422 attr = Add2Ptr(attr, asize);
1423 }
1424
1425 attr->id = cpu_to_le16(aid++);
1426 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1427 /*
1428 * Regular directory or symlink to directory.
1429 * Create root attribute.
1430 */
1431 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1432 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1433
1434 attr->type = ATTR_ROOT;
1435 attr->size = cpu_to_le32(asize);
1436
1437 attr->name_len = ARRAY_SIZE(I30_NAME);
1438 attr->name_off = SIZEOF_RESIDENT_LE;
1439 attr->res.data_off =
1440 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1441 attr->res.data_size = cpu_to_le32(dsize);
1442 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1443 sizeof(I30_NAME));
1444
1445 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1446 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1447 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1448 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1449 sizeof(struct NTFS_DE));
1450 root->ihdr.total = root->ihdr.used;
1451
1452 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1453 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1454 e->flags = NTFS_IE_LAST;
1455 } else if (S_ISLNK(mode)) {
1456 /*
1457 * Symlink to file.
1458 * Create empty resident data attribute.
1459 */
1460 asize = SIZEOF_RESIDENT;
1461
1462 /* Insert empty ATTR_DATA */
1463 attr->type = ATTR_DATA;
1464 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1465 attr->name_off = SIZEOF_RESIDENT_LE;
1466 attr->res.data_off = SIZEOF_RESIDENT_LE;
1467 } else if (!new_file_resident && S_ISREG(mode)) {
1468 /*
1469 * Regular file. Create empty non resident data attribute.
1470 */
1471 attr->type = ATTR_DATA;
1472 attr->non_res = 1;
1473 attr->nres.evcn = cpu_to_le64(-1ll);
1474 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1475 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1476 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1477 attr->flags = ATTR_FLAG_SPARSED;
1478 asize = SIZEOF_NONRESIDENT_EX + 8;
1479 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1480 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1481 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1482 attr->flags = ATTR_FLAG_COMPRESSED;
1483 attr->nres.c_unit = NTFS_LZNT_CUNIT;
1484 asize = SIZEOF_NONRESIDENT_EX + 8;
1485 } else {
1486 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1487 attr->name_off = SIZEOF_NONRESIDENT_LE;
1488 asize = SIZEOF_NONRESIDENT + 8;
1489 }
1490 attr->nres.run_off = attr->name_off;
1491 } else {
1492 /*
1493 * Node. Create empty resident data attribute.
1494 */
1495 attr->type = ATTR_DATA;
1496 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1497 attr->name_off = SIZEOF_RESIDENT_LE;
1498 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1499 attr->flags = ATTR_FLAG_SPARSED;
1500 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1501 attr->flags = ATTR_FLAG_COMPRESSED;
1502 attr->res.data_off = SIZEOF_RESIDENT_LE;
1503 asize = SIZEOF_RESIDENT;
1504 ni->ni_flags |= NI_FLAG_RESIDENT;
1505 }
1506
1507 if (S_ISDIR(mode)) {
1508 ni->ni_flags |= NI_FLAG_DIR;
1509 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1510 if (err)
1511 goto out4;
1512 } else if (S_ISLNK(mode)) {
1513 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1514
1515 if (IS_ERR(rp)) {
1516 err = PTR_ERR(rp);
1517 rp = NULL;
1518 goto out4;
1519 }
1520
1521 /*
1522 * Insert ATTR_REPARSE.
1523 */
1524 attr = Add2Ptr(attr, asize);
1525 attr->type = ATTR_REPARSE;
1526 attr->id = cpu_to_le16(aid++);
1527
1528 /* Resident or non resident? */
1529 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1530 t16 = PtrOffset(rec, attr);
1531
1532 /*
1533 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1534 * It is good idea to keep extended attributes resident.
1535 */
1536 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1537 CLST alen;
1538 CLST clst = bytes_to_cluster(sbi, nsize);
1539
1540 /* Bytes per runs. */
1541 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1542
1543 attr->non_res = 1;
1544 attr->nres.evcn = cpu_to_le64(clst - 1);
1545 attr->name_off = SIZEOF_NONRESIDENT_LE;
1546 attr->nres.run_off = attr->name_off;
1547 attr->nres.data_size = cpu_to_le64(nsize);
1548 attr->nres.valid_size = attr->nres.data_size;
1549 attr->nres.alloc_size =
1550 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1551
1552 err = attr_allocate_clusters(sbi, &ni->file.run, NULL,
1553 0, 0, clst, NULL,
1554 ALLOCATE_DEF, &alen, 0,
1555 NULL, NULL);
1556 if (err)
1557 goto out5;
1558
1559 err = run_pack(&ni->file.run, 0, clst,
1560 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1561 &vcn);
1562 if (err < 0)
1563 goto out5;
1564
1565 if (vcn != clst) {
1566 err = -EINVAL;
1567 goto out5;
1568 }
1569
1570 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1571 /* Write non resident data. */
1572 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1573 nsize, 0);
1574 if (err)
1575 goto out5;
1576 } else {
1577 attr->res.data_off = SIZEOF_RESIDENT_LE;
1578 attr->res.data_size = cpu_to_le32(nsize);
1579 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1580 }
1581 /* Size of symlink equals the length of input string. */
1582 inode->i_size = size;
1583
1584 attr->size = cpu_to_le32(asize);
1585
1586 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1587 &new_de->ref);
1588 if (err)
1589 goto out5;
1590
1591 rp_inserted = true;
1592 }
1593
1594 attr = Add2Ptr(attr, asize);
1595 attr->type = ATTR_END;
1596
1597 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1598 rec->next_attr_id = cpu_to_le16(aid);
1599
1600 inode->i_generation = le16_to_cpu(rec->seq);
1601
1602 if (S_ISDIR(mode)) {
1603 inode->i_op = &ntfs_dir_inode_operations;
1604 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1605 &ntfs_legacy_dir_operations :
1606 &ntfs_dir_operations;
1607 } else if (S_ISLNK(mode)) {
1608 inode->i_op = &ntfs_link_inode_operations;
1609 inode->i_fop = NULL;
1610 inode->i_mapping->a_ops = &ntfs_aops;
1611 inode->i_size = size;
1612 inode_nohighmem(inode);
1613 } else if (S_ISREG(mode)) {
1614 inode->i_op = &ntfs_file_inode_operations;
1615 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1616 &ntfs_legacy_file_operations :
1617 &ntfs_file_operations;
1618 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1619 &ntfs_aops;
1620 init_rwsem(&ni->file.run_lock);
1621 } else {
1622 inode->i_op = &ntfs_special_inode_operations;
1623 init_special_inode(inode, mode, dev);
1624 }
1625
1626 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1627 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1628 err = ntfs_init_acl(idmap, inode, dir);
1629 if (err)
1630 goto out5;
1631 } else
1632 #endif
1633 {
1634 inode->i_flags |= S_NOSEC;
1635 }
1636
1637 if (!S_ISLNK(mode)) {
1638 /*
1639 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1640 * The packed size of extended attribute is stored in direntry too.
1641 * 'fname' here points to inside new_de.
1642 */
1643 err = ntfs_save_wsl_perm(inode, &fname->dup.extend_data);
1644 if (err)
1645 goto out6;
1646
1647 /*
1648 * update ea_size in file_name attribute too.
1649 * Use ni_find_attr cause layout of MFT record may be changed
1650 * in ntfs_init_acl and ntfs_save_wsl_perm.
1651 */
1652 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL,
1653 NULL);
1654 if (attr) {
1655 struct ATTR_FILE_NAME *fn;
1656
1657 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1658 if (fn)
1659 fn->dup.extend_data = fname->dup.extend_data;
1660 }
1661 }
1662
1663 /* We do not need to update parent directory later */
1664 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1665
1666 /* Step 2: Add new name in index. */
1667 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1668 if (err)
1669 goto out6;
1670
1671 /*
1672 * Call 'd_instantiate' after inode->i_op is set
1673 * but before finish_open.
1674 */
1675 d_instantiate(dentry, inode);
1676
1677 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1678 inode_set_atime_to_ts(inode, ni->i_crtime);
1679 inode_set_ctime_to_ts(inode, ni->i_crtime);
1680 inode_set_mtime_to_ts(inode, ni->i_crtime);
1681 inode_set_mtime_to_ts(dir, ni->i_crtime);
1682 inode_set_ctime_to_ts(dir, ni->i_crtime);
1683
1684 mark_inode_dirty(dir);
1685 mark_inode_dirty(inode);
1686
1687 /* Normal exit. */
1688 goto out2;
1689
1690 out6:
1691 attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL);
1692 if (attr && attr->non_res) {
1693 /* Delete ATTR_EA, if non-resident. */
1694 struct runs_tree run;
1695 run_init(&run);
1696 attr_set_size(ni, ATTR_EA, NULL, 0, &run, 0, NULL, false);
1697 run_close(&run);
1698 }
1699
1700 if (rp_inserted)
1701 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1702
1703 out5:
1704 if (!S_ISDIR(mode))
1705 run_deallocate(sbi, &ni->file.run, false);
1706
1707 out4:
1708 clear_rec_inuse(rec);
1709 clear_nlink(inode);
1710 ni->mi.dirty = false;
1711 discard_new_inode(inode);
1712 out3:
1713 ntfs_mark_rec_free(sbi, ino, false);
1714
1715 out2:
1716 kfree(new_de);
1717 kfree(rp);
1718
1719 out1:
1720 if (!fnd)
1721 ni_unlock(dir_ni);
1722
1723 if (!err)
1724 unlock_new_inode(inode);
1725
1726 return err;
1727 }
1728
ntfs_link_inode(struct inode * inode,struct dentry * dentry)1729 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1730 {
1731 int err;
1732 struct ntfs_inode *ni = ntfs_i(inode);
1733 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1734 struct NTFS_DE *de;
1735
1736 /* Allocate PATH_MAX bytes. */
1737 de = kzalloc(PATH_MAX, GFP_KERNEL);
1738 if (!de)
1739 return -ENOMEM;
1740
1741 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1742 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1743
1744 /* Construct 'de'. */
1745 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1746 if (err)
1747 goto out;
1748
1749 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1750 out:
1751 kfree(de);
1752 return err;
1753 }
1754
1755 /*
1756 * ntfs_unlink_inode
1757 *
1758 * inode_operations::unlink
1759 * inode_operations::rmdir
1760 */
ntfs_unlink_inode(struct inode * dir,const struct dentry * dentry)1761 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1762 {
1763 int err;
1764 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1765 struct inode *inode = d_inode(dentry);
1766 struct ntfs_inode *ni = ntfs_i(inode);
1767 struct ntfs_inode *dir_ni = ntfs_i(dir);
1768 struct NTFS_DE *de, *de2 = NULL;
1769 int undo_remove;
1770
1771 if (ntfs_is_meta_file(sbi, ni->mi.rno))
1772 return -EINVAL;
1773
1774 de = kzalloc(PATH_MAX, GFP_KERNEL);
1775 if (!de)
1776 return -ENOMEM;
1777
1778 ni_lock(ni);
1779
1780 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1781 err = -ENOTEMPTY;
1782 goto out;
1783 }
1784
1785 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1786 if (err < 0)
1787 goto out;
1788
1789 undo_remove = 0;
1790 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1791
1792 if (!err) {
1793 drop_nlink(inode);
1794 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1795 mark_inode_dirty(dir);
1796 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1797 if (inode->i_nlink)
1798 mark_inode_dirty(inode);
1799 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1800 _ntfs_bad_inode(inode);
1801 } else {
1802 if (ni_is_dirty(dir))
1803 mark_inode_dirty(dir);
1804 if (ni_is_dirty(inode))
1805 mark_inode_dirty(inode);
1806 }
1807
1808 out:
1809 ni_unlock(ni);
1810 kfree(de);
1811 return err;
1812 }
1813
ntfs_evict_inode(struct inode * inode)1814 void ntfs_evict_inode(struct inode *inode)
1815 {
1816 truncate_inode_pages_final(&inode->i_data);
1817
1818 clear_inode(inode);
1819
1820 ni_clear(ntfs_i(inode));
1821 }
1822
1823 /*
1824 * ntfs_translate_junction
1825 *
1826 * Translate a Windows junction target to the Linux equivalent.
1827 * On junctions, targets are always absolute (they include the drive
1828 * letter). We have no way of knowing if the target is for the current
1829 * mounted device or not so we just assume it is.
1830 */
ntfs_translate_junction(const struct super_block * sb,const struct dentry * link_de,char * target,int target_len,int target_max)1831 static int ntfs_translate_junction(const struct super_block *sb,
1832 const struct dentry *link_de, char *target,
1833 int target_len, int target_max)
1834 {
1835 int tl_len, err = target_len;
1836 char *link_path_buffer = NULL, *link_path;
1837 char *translated = NULL;
1838 char *target_start;
1839 int copy_len;
1840
1841 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1842 if (!link_path_buffer) {
1843 err = -ENOMEM;
1844 goto out;
1845 }
1846 /* Get link path, relative to mount point */
1847 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1848 if (IS_ERR(link_path)) {
1849 ntfs_err(sb, "Error getting link path");
1850 err = -EINVAL;
1851 goto out;
1852 }
1853
1854 translated = kmalloc(PATH_MAX, GFP_NOFS);
1855 if (!translated) {
1856 err = -ENOMEM;
1857 goto out;
1858 }
1859
1860 /* Make translated path a relative path to mount point */
1861 strcpy(translated, "./");
1862 ++link_path; /* Skip leading / */
1863 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1864 if (*link_path == '/') {
1865 if (PATH_MAX - tl_len < sizeof("../")) {
1866 ntfs_err(sb,
1867 "Link path %s has too many components",
1868 link_path);
1869 err = -EINVAL;
1870 goto out;
1871 }
1872 strcpy(translated + tl_len, "../");
1873 tl_len += sizeof("../") - 1;
1874 }
1875 }
1876
1877 /* Skip drive letter */
1878 target_start = target;
1879 while (*target_start && *target_start != ':')
1880 ++target_start;
1881
1882 if (!*target_start) {
1883 ntfs_err(sb, "Link target (%s) missing drive separator",
1884 target);
1885 err = -EINVAL;
1886 goto out;
1887 }
1888
1889 /* Skip drive separator and leading /, if exists */
1890 target_start += 1 + (target_start[1] == '/');
1891 copy_len = target_len - (target_start - target);
1892
1893 if (PATH_MAX - tl_len <= copy_len) {
1894 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1895 target_start, PATH_MAX - tl_len, copy_len);
1896 err = -EINVAL;
1897 goto out;
1898 }
1899
1900 /* translated path has a trailing / and target_start does not */
1901 strcpy(translated + tl_len, target_start);
1902 tl_len += copy_len;
1903 if (target_max <= tl_len) {
1904 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1905 translated, target_max, tl_len);
1906 err = -EINVAL;
1907 goto out;
1908 }
1909 strcpy(target, translated);
1910 err = tl_len;
1911
1912 out:
1913 kfree(link_path_buffer);
1914 kfree(translated);
1915 return err;
1916 }
1917
ntfs_readlink_hlp(const struct dentry * link_de,struct inode * inode,char * buffer,int buflen)1918 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1919 struct inode *inode, char *buffer,
1920 int buflen)
1921 {
1922 int i, err = -EINVAL;
1923 struct ntfs_inode *ni = ntfs_i(inode);
1924 struct super_block *sb = inode->i_sb;
1925 struct ntfs_sb_info *sbi = sb->s_fs_info;
1926 u64 size;
1927 u16 ulen = 0;
1928 void *to_free = NULL;
1929 struct REPARSE_DATA_BUFFER *rp;
1930 const __le16 *uname;
1931 struct ATTRIB *attr;
1932
1933 /* Reparse data present. Try to parse it. */
1934 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1935 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1936
1937 *buffer = 0;
1938
1939 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1940 if (!attr)
1941 goto out;
1942
1943 if (!attr->non_res) {
1944 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1945 if (!rp)
1946 goto out;
1947 size = le32_to_cpu(attr->res.data_size);
1948 } else {
1949 size = le64_to_cpu(attr->nres.data_size);
1950 rp = NULL;
1951 }
1952
1953 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1954 goto out;
1955
1956 if (!rp) {
1957 rp = kmalloc(size, GFP_NOFS);
1958 if (!rp) {
1959 err = -ENOMEM;
1960 goto out;
1961 }
1962 to_free = rp;
1963 /* Read into temporal buffer. */
1964 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1965 if (err)
1966 goto out;
1967 }
1968
1969 /* Microsoft Tag. */
1970 switch (rp->ReparseTag) {
1971 case IO_REPARSE_TAG_MOUNT_POINT:
1972 /* Mount points and junctions. */
1973 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1974 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1975 MountPointReparseBuffer.PathBuffer))
1976 goto out;
1977 uname = Add2Ptr(rp,
1978 offsetof(struct REPARSE_DATA_BUFFER,
1979 MountPointReparseBuffer.PathBuffer) +
1980 le16_to_cpu(rp->MountPointReparseBuffer
1981 .PrintNameOffset));
1982 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1983 break;
1984
1985 case IO_REPARSE_TAG_SYMLINK:
1986 /* FolderSymbolicLink */
1987 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1988 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1989 SymbolicLinkReparseBuffer.PathBuffer))
1990 goto out;
1991 uname = Add2Ptr(
1992 rp, offsetof(struct REPARSE_DATA_BUFFER,
1993 SymbolicLinkReparseBuffer.PathBuffer) +
1994 le16_to_cpu(rp->SymbolicLinkReparseBuffer
1995 .PrintNameOffset));
1996 ulen = le16_to_cpu(
1997 rp->SymbolicLinkReparseBuffer.PrintNameLength);
1998 break;
1999
2000 case IO_REPARSE_TAG_CLOUD:
2001 case IO_REPARSE_TAG_CLOUD_1:
2002 case IO_REPARSE_TAG_CLOUD_2:
2003 case IO_REPARSE_TAG_CLOUD_3:
2004 case IO_REPARSE_TAG_CLOUD_4:
2005 case IO_REPARSE_TAG_CLOUD_5:
2006 case IO_REPARSE_TAG_CLOUD_6:
2007 case IO_REPARSE_TAG_CLOUD_7:
2008 case IO_REPARSE_TAG_CLOUD_8:
2009 case IO_REPARSE_TAG_CLOUD_9:
2010 case IO_REPARSE_TAG_CLOUD_A:
2011 case IO_REPARSE_TAG_CLOUD_B:
2012 case IO_REPARSE_TAG_CLOUD_C:
2013 case IO_REPARSE_TAG_CLOUD_D:
2014 case IO_REPARSE_TAG_CLOUD_E:
2015 case IO_REPARSE_TAG_CLOUD_F:
2016 err = sizeof("OneDrive") - 1;
2017 if (err > buflen)
2018 err = buflen;
2019 memcpy(buffer, "OneDrive", err);
2020 goto out;
2021
2022 default:
2023 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2024 /* Unknown Microsoft Tag. */
2025 goto out;
2026 }
2027 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2028 size <= sizeof(struct REPARSE_POINT)) {
2029 goto out;
2030 }
2031
2032 /* Users tag. */
2033 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2034 ulen = le16_to_cpu(rp->ReparseDataLength) -
2035 sizeof(struct REPARSE_POINT);
2036 }
2037
2038 /* Convert nlen from bytes to UNICODE chars. */
2039 ulen >>= 1;
2040
2041 /* Check that name is available. */
2042 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2043 goto out;
2044
2045 /* If name is already zero terminated then truncate it now. */
2046 if (!uname[ulen - 1])
2047 ulen -= 1;
2048
2049 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2050
2051 if (err < 0)
2052 goto out;
2053
2054 /* Translate Windows '\' into Linux '/'. */
2055 for (i = 0; i < err; i++) {
2056 if (buffer[i] == '\\')
2057 buffer[i] = '/';
2058 }
2059
2060 /* Always set last zero. */
2061 buffer[err] = 0;
2062
2063 /* If this is a junction, translate the link target. */
2064 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2065 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2066
2067 out:
2068 kfree(to_free);
2069 return err;
2070 }
2071
ntfs_get_link(struct dentry * de,struct inode * inode,struct delayed_call * done)2072 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2073 struct delayed_call *done)
2074 {
2075 int err;
2076 char *ret;
2077
2078 if (!de)
2079 return ERR_PTR(-ECHILD);
2080
2081 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2082 if (!ret)
2083 return ERR_PTR(-ENOMEM);
2084
2085 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2086 if (err < 0) {
2087 kfree(ret);
2088 return ERR_PTR(err);
2089 }
2090
2091 set_delayed_call(done, kfree_link, ret);
2092
2093 return ret;
2094 }
2095
2096 // clang-format off
2097 const struct inode_operations ntfs_link_inode_operations = {
2098 .get_link = ntfs_get_link,
2099 .setattr = ntfs_setattr,
2100 .listxattr = ntfs_listxattr,
2101 };
2102
2103 const struct address_space_operations ntfs_aops = {
2104 .read_folio = ntfs_read_folio,
2105 .readahead = ntfs_readahead,
2106 .writepages = ntfs_writepages,
2107 .bmap = ntfs_bmap,
2108 .dirty_folio = iomap_dirty_folio,
2109 .migrate_folio = filemap_migrate_folio,
2110 .release_folio = iomap_release_folio,
2111 .invalidate_folio = iomap_invalidate_folio,
2112 };
2113
2114 const struct address_space_operations ntfs_aops_cmpr = {
2115 .read_folio = ntfs_read_folio,
2116 .dirty_folio = iomap_dirty_folio,
2117 .release_folio = iomap_release_folio,
2118 .invalidate_folio = iomap_invalidate_folio,
2119 };
2120
2121 const struct iomap_ops ntfs_iomap_ops = {
2122 .iomap_begin = ntfs_iomap_begin,
2123 .iomap_end = ntfs_iomap_end,
2124 };
2125
2126 const struct iomap_write_ops ntfs_iomap_folio_ops = {
2127 .put_folio = ntfs_iomap_put_folio,
2128 };
2129 // clang-format on
2130