1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 *
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
5 *
6 */
7
8 #include <linux/buffer_head.h>
9 #include <linux/fs.h>
10 #include <linux/mpage.h>
11 #include <linux/namei.h>
12 #include <linux/nls.h>
13 #include <linux/uio.h>
14 #include <linux/writeback.h>
15
16 #include "debug.h"
17 #include "ntfs.h"
18 #include "ntfs_fs.h"
19
20 /*
21 * ntfs_read_mft - Read record and parses MFT.
22 */
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 ctime;
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, &inode->i_atime);
173 nt2kernel(std5->c_time, &ctime);
174 inode_set_ctime_to_ts(inode, ctime);
175 nt2kernel(std5->m_time, &inode->i_mtime);
176
177 ni->std_fa = std5->fa;
178
179 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
180 rsize >= sizeof(struct ATTR_STD_INFO5))
181 ni->std_security_id = std5->security_id;
182 goto next_attr;
183
184 case ATTR_LIST:
185 if (attr->name_len || le || ino == MFT_REC_LOG)
186 goto out;
187
188 err = ntfs_load_attr_list(ni, attr);
189 if (err)
190 goto out;
191
192 le = NULL;
193 attr = NULL;
194 goto next_attr;
195
196 case ATTR_NAME:
197 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
198 rsize < SIZEOF_ATTRIBUTE_FILENAME)
199 goto out;
200
201 names += 1;
202 fname = Add2Ptr(attr, roff);
203 if (fname->type == FILE_NAME_DOS)
204 goto next_attr;
205
206 links += 1;
207 if (name && name->len == fname->name_len &&
208 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
209 NULL, false))
210 is_match = true;
211
212 goto next_attr;
213
214 case ATTR_DATA:
215 if (is_dir) {
216 /* Ignore data attribute in dir record. */
217 goto next_attr;
218 }
219
220 if (ino == MFT_REC_BADCLUST && !attr->non_res)
221 goto next_attr;
222
223 if (attr->name_len &&
224 ((ino != MFT_REC_BADCLUST || !attr->non_res ||
225 attr->name_len != ARRAY_SIZE(BAD_NAME) ||
226 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
227 (ino != MFT_REC_SECURE || !attr->non_res ||
228 attr->name_len != ARRAY_SIZE(SDS_NAME) ||
229 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
230 /* File contains stream attribute. Ignore it. */
231 goto next_attr;
232 }
233
234 if (is_attr_sparsed(attr))
235 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
236 else
237 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
238
239 if (is_attr_compressed(attr))
240 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
241 else
242 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
243
244 if (is_attr_encrypted(attr))
245 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
246 else
247 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
248
249 if (!attr->non_res) {
250 ni->i_valid = inode->i_size = rsize;
251 inode_set_bytes(inode, rsize);
252 }
253
254 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
255
256 if (!attr->non_res) {
257 ni->ni_flags |= NI_FLAG_RESIDENT;
258 goto next_attr;
259 }
260
261 inode_set_bytes(inode, attr_ondisk_size(attr));
262
263 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
264 inode->i_size = le64_to_cpu(attr->nres.data_size);
265 if (!attr->nres.alloc_size)
266 goto next_attr;
267
268 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
269 &ni->file.run;
270 break;
271
272 case ATTR_ROOT:
273 if (attr->non_res)
274 goto out;
275
276 root = Add2Ptr(attr, roff);
277
278 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
279 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
280 goto next_attr;
281
282 if (root->type != ATTR_NAME ||
283 root->rule != NTFS_COLLATION_TYPE_FILENAME)
284 goto out;
285
286 if (!is_dir)
287 goto next_attr;
288
289 is_root = true;
290 ni->ni_flags |= NI_FLAG_DIR;
291
292 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
293 if (err)
294 goto out;
295
296 mode = sb->s_root ?
297 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
298 (S_IFDIR | 0777);
299 goto next_attr;
300
301 case ATTR_ALLOC:
302 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
303 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
304 goto next_attr;
305
306 inode->i_size = le64_to_cpu(attr->nres.data_size);
307 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
308 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
309
310 run = &ni->dir.alloc_run;
311 break;
312
313 case ATTR_BITMAP:
314 if (ino == MFT_REC_MFT) {
315 if (!attr->non_res)
316 goto out;
317 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
318 /* 0x20000000 = 2^32 / 8 */
319 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
320 goto out;
321 #endif
322 run = &sbi->mft.bitmap.run;
323 break;
324 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
325 !memcmp(attr_name(attr), I30_NAME,
326 sizeof(I30_NAME)) &&
327 attr->non_res) {
328 run = &ni->dir.bitmap_run;
329 break;
330 }
331 goto next_attr;
332
333 case ATTR_REPARSE:
334 if (attr->name_len)
335 goto next_attr;
336
337 rp_fa = ni_parse_reparse(ni, attr, &rp);
338 switch (rp_fa) {
339 case REPARSE_LINK:
340 /*
341 * Normal symlink.
342 * Assume one unicode symbol == one utf8.
343 */
344 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
345 .PrintNameLength) /
346 sizeof(u16);
347
348 ni->i_valid = inode->i_size;
349
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 = &ntfs_dir_operations;
445 ni->i_valid = 0;
446 } else if (S_ISLNK(mode)) {
447 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
448 inode->i_op = &ntfs_link_inode_operations;
449 inode->i_fop = NULL;
450 inode_nohighmem(inode);
451 } else if (S_ISREG(mode)) {
452 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
453 inode->i_op = &ntfs_file_inode_operations;
454 inode->i_fop = &ntfs_file_operations;
455 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
456 &ntfs_aops;
457 if (ino != MFT_REC_MFT)
458 init_rwsem(&ni->file.run_lock);
459 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
460 S_ISSOCK(mode)) {
461 inode->i_op = &ntfs_special_inode_operations;
462 init_special_inode(inode, mode, inode->i_rdev);
463 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
464 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
465 /* Records in $Extend are not a files or general directories. */
466 inode->i_op = &ntfs_file_inode_operations;
467 } else {
468 err = -EINVAL;
469 goto out;
470 }
471
472 if ((sbi->options->sys_immutable &&
473 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
474 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
475 inode->i_flags |= S_IMMUTABLE;
476 } else {
477 inode->i_flags &= ~S_IMMUTABLE;
478 }
479
480 inode->i_mode = mode;
481 if (!(ni->ni_flags & NI_FLAG_EA)) {
482 /* If no xattr then no security (stored in xattr). */
483 inode->i_flags |= S_NOSEC;
484 }
485
486 if (ino == MFT_REC_MFT && !sb->s_root)
487 sbi->mft.ni = NULL;
488
489 unlock_new_inode(inode);
490
491 return inode;
492
493 out:
494 if (ino == MFT_REC_MFT && !sb->s_root)
495 sbi->mft.ni = NULL;
496
497 iget_failed(inode);
498 return ERR_PTR(err);
499 }
500
501 /*
502 * ntfs_test_inode
503 *
504 * Return: 1 if match.
505 */
ntfs_test_inode(struct inode * inode,void * data)506 static int ntfs_test_inode(struct inode *inode, void *data)
507 {
508 struct MFT_REF *ref = data;
509
510 return ino_get(ref) == inode->i_ino;
511 }
512
ntfs_set_inode(struct inode * inode,void * data)513 static int ntfs_set_inode(struct inode *inode, void *data)
514 {
515 const struct MFT_REF *ref = data;
516
517 inode->i_ino = ino_get(ref);
518 return 0;
519 }
520
ntfs_iget5(struct super_block * sb,const struct MFT_REF * ref,const struct cpu_str * name)521 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
522 const struct cpu_str *name)
523 {
524 struct inode *inode;
525
526 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
527 (void *)ref);
528 if (unlikely(!inode))
529 return ERR_PTR(-ENOMEM);
530
531 /* If this is a freshly allocated inode, need to read it now. */
532 if (inode->i_state & I_NEW)
533 inode = ntfs_read_mft(inode, name, ref);
534 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
535 /* Inode overlaps? */
536 _ntfs_bad_inode(inode);
537 }
538
539 if (IS_ERR(inode) && name)
540 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
541
542 return inode;
543 }
544
545 enum get_block_ctx {
546 GET_BLOCK_GENERAL = 0,
547 GET_BLOCK_WRITE_BEGIN = 1,
548 GET_BLOCK_DIRECT_IO_R = 2,
549 GET_BLOCK_DIRECT_IO_W = 3,
550 GET_BLOCK_BMAP = 4,
551 };
552
ntfs_get_block_vbo(struct inode * inode,u64 vbo,struct buffer_head * bh,int create,enum get_block_ctx ctx)553 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
554 struct buffer_head *bh, int create,
555 enum get_block_ctx ctx)
556 {
557 struct super_block *sb = inode->i_sb;
558 struct ntfs_sb_info *sbi = sb->s_fs_info;
559 struct ntfs_inode *ni = ntfs_i(inode);
560 struct folio *folio = bh->b_folio;
561 u8 cluster_bits = sbi->cluster_bits;
562 u32 block_size = sb->s_blocksize;
563 u64 bytes, lbo, valid;
564 u32 off;
565 int err;
566 CLST vcn, lcn, len;
567 bool new;
568
569 /* Clear previous state. */
570 clear_buffer_new(bh);
571 clear_buffer_uptodate(bh);
572
573 if (is_resident(ni)) {
574 bh->b_blocknr = RESIDENT_LCN;
575 bh->b_size = block_size;
576 if (!folio) {
577 err = 0;
578 } else {
579 ni_lock(ni);
580 err = attr_data_read_resident(ni, &folio->page);
581 ni_unlock(ni);
582
583 if (!err)
584 set_buffer_uptodate(bh);
585 }
586 return err;
587 }
588
589 vcn = vbo >> cluster_bits;
590 off = vbo & sbi->cluster_mask;
591 new = false;
592
593 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
594 create && sbi->cluster_size > PAGE_SIZE);
595 if (err)
596 goto out;
597
598 if (!len)
599 return 0;
600
601 bytes = ((u64)len << cluster_bits) - off;
602
603 if (lcn == SPARSE_LCN) {
604 if (!create) {
605 if (bh->b_size > bytes)
606 bh->b_size = bytes;
607 return 0;
608 }
609 WARN_ON(1);
610 }
611
612 if (new)
613 set_buffer_new(bh);
614
615 lbo = ((u64)lcn << cluster_bits) + off;
616
617 set_buffer_mapped(bh);
618 bh->b_bdev = sb->s_bdev;
619 bh->b_blocknr = lbo >> sb->s_blocksize_bits;
620
621 valid = ni->i_valid;
622
623 if (ctx == GET_BLOCK_DIRECT_IO_W) {
624 /* ntfs_direct_IO will update ni->i_valid. */
625 if (vbo >= valid)
626 set_buffer_new(bh);
627 } else if (create) {
628 /* Normal write. */
629 if (bytes > bh->b_size)
630 bytes = bh->b_size;
631
632 if (vbo >= valid)
633 set_buffer_new(bh);
634
635 if (vbo + bytes > valid) {
636 ni->i_valid = vbo + bytes;
637 mark_inode_dirty(inode);
638 }
639 } else if (vbo >= valid) {
640 /* Read out of valid data. */
641 clear_buffer_mapped(bh);
642 } else if (vbo + bytes <= valid) {
643 /* Normal read. */
644 } else if (vbo + block_size <= valid) {
645 /* Normal short read. */
646 bytes = block_size;
647 } else {
648 /*
649 * Read across valid size: vbo < valid && valid < vbo + block_size
650 */
651 bytes = block_size;
652
653 if (folio) {
654 u32 voff = valid - vbo;
655
656 bh->b_size = block_size;
657 off = vbo & (PAGE_SIZE - 1);
658 folio_set_bh(bh, folio, off);
659
660 err = bh_read(bh, 0);
661 if (err < 0)
662 goto out;
663 folio_zero_segment(folio, off + voff, off + block_size);
664 }
665 }
666
667 if (bh->b_size > bytes)
668 bh->b_size = bytes;
669
670 #ifndef __LP64__
671 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
672 static_assert(sizeof(size_t) < sizeof(loff_t));
673 if (bytes > 0x40000000u)
674 bh->b_size = 0x40000000u;
675 }
676 #endif
677
678 return 0;
679
680 out:
681 return err;
682 }
683
ntfs_get_block(struct inode * inode,sector_t vbn,struct buffer_head * bh_result,int create)684 int ntfs_get_block(struct inode *inode, sector_t vbn,
685 struct buffer_head *bh_result, int create)
686 {
687 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
688 bh_result, create, GET_BLOCK_GENERAL);
689 }
690
ntfs_get_block_bmap(struct inode * inode,sector_t vsn,struct buffer_head * bh_result,int create)691 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
692 struct buffer_head *bh_result, int create)
693 {
694 return ntfs_get_block_vbo(inode,
695 (u64)vsn << inode->i_sb->s_blocksize_bits,
696 bh_result, create, GET_BLOCK_BMAP);
697 }
698
ntfs_bmap(struct address_space * mapping,sector_t block)699 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
700 {
701 return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
702 }
703
ntfs_read_folio(struct file * file,struct folio * folio)704 static int ntfs_read_folio(struct file *file, struct folio *folio)
705 {
706 struct page *page = &folio->page;
707 int err;
708 struct address_space *mapping = page->mapping;
709 struct inode *inode = mapping->host;
710 struct ntfs_inode *ni = ntfs_i(inode);
711
712 if (is_resident(ni)) {
713 ni_lock(ni);
714 err = attr_data_read_resident(ni, page);
715 ni_unlock(ni);
716 if (err != E_NTFS_NONRESIDENT) {
717 unlock_page(page);
718 return err;
719 }
720 }
721
722 if (is_compressed(ni)) {
723 ni_lock(ni);
724 err = ni_readpage_cmpr(ni, page);
725 ni_unlock(ni);
726 return err;
727 }
728
729 /* Normal + sparse files. */
730 return mpage_read_folio(folio, ntfs_get_block);
731 }
732
ntfs_readahead(struct readahead_control * rac)733 static void ntfs_readahead(struct readahead_control *rac)
734 {
735 struct address_space *mapping = rac->mapping;
736 struct inode *inode = mapping->host;
737 struct ntfs_inode *ni = ntfs_i(inode);
738 u64 valid;
739 loff_t pos;
740
741 if (is_resident(ni)) {
742 /* No readahead for resident. */
743 return;
744 }
745
746 if (is_compressed(ni)) {
747 /* No readahead for compressed. */
748 return;
749 }
750
751 valid = ni->i_valid;
752 pos = readahead_pos(rac);
753
754 if (valid < i_size_read(inode) && pos <= valid &&
755 valid < pos + readahead_length(rac)) {
756 /* Range cross 'valid'. Read it page by page. */
757 return;
758 }
759
760 mpage_readahead(rac, ntfs_get_block);
761 }
762
ntfs_get_block_direct_IO_R(struct inode * inode,sector_t iblock,struct buffer_head * bh_result,int create)763 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
764 struct buffer_head *bh_result, int create)
765 {
766 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
767 bh_result, create, GET_BLOCK_DIRECT_IO_R);
768 }
769
ntfs_get_block_direct_IO_W(struct inode * inode,sector_t iblock,struct buffer_head * bh_result,int create)770 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
771 struct buffer_head *bh_result, int create)
772 {
773 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
774 bh_result, create, GET_BLOCK_DIRECT_IO_W);
775 }
776
ntfs_direct_IO(struct kiocb * iocb,struct iov_iter * iter)777 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
778 {
779 struct file *file = iocb->ki_filp;
780 struct address_space *mapping = file->f_mapping;
781 struct inode *inode = mapping->host;
782 struct ntfs_inode *ni = ntfs_i(inode);
783 loff_t vbo = iocb->ki_pos;
784 loff_t end;
785 int wr = iov_iter_rw(iter) & WRITE;
786 size_t iter_count = iov_iter_count(iter);
787 loff_t valid;
788 ssize_t ret;
789
790 if (is_resident(ni)) {
791 /* Switch to buffered write. */
792 ret = 0;
793 goto out;
794 }
795
796 ret = blockdev_direct_IO(iocb, inode, iter,
797 wr ? ntfs_get_block_direct_IO_W :
798 ntfs_get_block_direct_IO_R);
799
800 if (ret > 0)
801 end = vbo + ret;
802 else if (wr && ret == -EIOCBQUEUED)
803 end = vbo + iter_count;
804 else
805 goto out;
806
807 valid = ni->i_valid;
808 if (wr) {
809 if (end > valid && !S_ISBLK(inode->i_mode)) {
810 ni->i_valid = end;
811 mark_inode_dirty(inode);
812 }
813 } else if (vbo < valid && valid < end) {
814 /* Fix page. */
815 iov_iter_revert(iter, end - valid);
816 iov_iter_zero(end - valid, iter);
817 }
818
819 out:
820 return ret;
821 }
822
ntfs_set_size(struct inode * inode,u64 new_size)823 int ntfs_set_size(struct inode *inode, u64 new_size)
824 {
825 struct super_block *sb = inode->i_sb;
826 struct ntfs_sb_info *sbi = sb->s_fs_info;
827 struct ntfs_inode *ni = ntfs_i(inode);
828 int err;
829
830 /* Check for maximum file size. */
831 if (is_sparsed(ni) || is_compressed(ni)) {
832 if (new_size > sbi->maxbytes_sparse) {
833 err = -EFBIG;
834 goto out;
835 }
836 } else if (new_size > sbi->maxbytes) {
837 err = -EFBIG;
838 goto out;
839 }
840
841 ni_lock(ni);
842 down_write(&ni->file.run_lock);
843
844 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
845 &ni->i_valid, true, NULL);
846
847 up_write(&ni->file.run_lock);
848 ni_unlock(ni);
849
850 mark_inode_dirty(inode);
851
852 out:
853 return err;
854 }
855
ntfs_resident_writepage(struct folio * folio,struct writeback_control * wbc,void * data)856 static int ntfs_resident_writepage(struct folio *folio,
857 struct writeback_control *wbc, void *data)
858 {
859 struct address_space *mapping = data;
860 struct inode *inode = mapping->host;
861 struct ntfs_inode *ni = ntfs_i(inode);
862 int ret;
863
864 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
865 return -EIO;
866
867 ni_lock(ni);
868 ret = attr_data_write_resident(ni, &folio->page);
869 ni_unlock(ni);
870
871 if (ret != E_NTFS_NONRESIDENT)
872 folio_unlock(folio);
873 mapping_set_error(mapping, ret);
874 return ret;
875 }
876
ntfs_writepages(struct address_space * mapping,struct writeback_control * wbc)877 static int ntfs_writepages(struct address_space *mapping,
878 struct writeback_control *wbc)
879 {
880 struct inode *inode = mapping->host;
881
882 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
883 return -EIO;
884
885 if (is_resident(ntfs_i(inode)))
886 return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
887 mapping);
888 return mpage_writepages(mapping, wbc, ntfs_get_block);
889 }
890
ntfs_get_block_write_begin(struct inode * inode,sector_t vbn,struct buffer_head * bh_result,int create)891 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
892 struct buffer_head *bh_result, int create)
893 {
894 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
895 bh_result, create, GET_BLOCK_WRITE_BEGIN);
896 }
897
ntfs_write_begin(struct file * file,struct address_space * mapping,loff_t pos,u32 len,struct page ** pagep,void ** fsdata)898 int ntfs_write_begin(struct file *file, struct address_space *mapping,
899 loff_t pos, u32 len, struct page **pagep, void **fsdata)
900 {
901 int err;
902 struct inode *inode = mapping->host;
903 struct ntfs_inode *ni = ntfs_i(inode);
904
905 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
906 return -EIO;
907
908 *pagep = NULL;
909 if (is_resident(ni)) {
910 struct page *page =
911 grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT);
912
913 if (!page) {
914 err = -ENOMEM;
915 goto out;
916 }
917
918 ni_lock(ni);
919 err = attr_data_read_resident(ni, page);
920 ni_unlock(ni);
921
922 if (!err) {
923 *pagep = page;
924 goto out;
925 }
926 unlock_page(page);
927 put_page(page);
928
929 if (err != E_NTFS_NONRESIDENT)
930 goto out;
931 }
932
933 err = block_write_begin(mapping, pos, len, pagep,
934 ntfs_get_block_write_begin);
935
936 out:
937 return err;
938 }
939
940 /*
941 * ntfs_write_end - Address_space_operations::write_end.
942 */
ntfs_write_end(struct file * file,struct address_space * mapping,loff_t pos,u32 len,u32 copied,struct page * page,void * fsdata)943 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
944 u32 len, u32 copied, struct page *page, void *fsdata)
945 {
946 struct inode *inode = mapping->host;
947 struct ntfs_inode *ni = ntfs_i(inode);
948 u64 valid = ni->i_valid;
949 bool dirty = false;
950 int err;
951
952 if (is_resident(ni)) {
953 ni_lock(ni);
954 err = attr_data_write_resident(ni, page);
955 ni_unlock(ni);
956 if (!err) {
957 dirty = true;
958 /* Clear any buffers in page. */
959 if (page_has_buffers(page)) {
960 struct buffer_head *head, *bh;
961
962 bh = head = page_buffers(page);
963 do {
964 clear_buffer_dirty(bh);
965 clear_buffer_mapped(bh);
966 set_buffer_uptodate(bh);
967 } while (head != (bh = bh->b_this_page));
968 }
969 SetPageUptodate(page);
970 err = copied;
971 }
972 unlock_page(page);
973 put_page(page);
974 } else {
975 err = generic_write_end(file, mapping, pos, len, copied, page,
976 fsdata);
977 }
978
979 if (err >= 0) {
980 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
981 inode->i_mtime = inode_set_ctime_current(inode);
982 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
983 dirty = true;
984 }
985
986 if (valid != ni->i_valid) {
987 /* ni->i_valid is changed in ntfs_get_block_vbo. */
988 dirty = true;
989 }
990
991 if (pos + err > inode->i_size) {
992 i_size_write(inode, pos + err);
993 dirty = true;
994 }
995
996 if (dirty)
997 mark_inode_dirty(inode);
998 }
999
1000 return err;
1001 }
1002
reset_log_file(struct inode * inode)1003 int reset_log_file(struct inode *inode)
1004 {
1005 int err;
1006 loff_t pos = 0;
1007 u32 log_size = inode->i_size;
1008 struct address_space *mapping = inode->i_mapping;
1009
1010 for (;;) {
1011 u32 len;
1012 void *kaddr;
1013 struct page *page;
1014
1015 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
1016
1017 err = block_write_begin(mapping, pos, len, &page,
1018 ntfs_get_block_write_begin);
1019 if (err)
1020 goto out;
1021
1022 kaddr = kmap_atomic(page);
1023 memset(kaddr, -1, len);
1024 kunmap_atomic(kaddr);
1025 flush_dcache_page(page);
1026
1027 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
1028 if (err < 0)
1029 goto out;
1030 pos += len;
1031
1032 if (pos >= log_size)
1033 break;
1034 balance_dirty_pages_ratelimited(mapping);
1035 }
1036 out:
1037 mark_inode_dirty_sync(inode);
1038
1039 return err;
1040 }
1041
ntfs3_write_inode(struct inode * inode,struct writeback_control * wbc)1042 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1043 {
1044 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1045 }
1046
ntfs_sync_inode(struct inode * inode)1047 int ntfs_sync_inode(struct inode *inode)
1048 {
1049 return _ni_write_inode(inode, 1);
1050 }
1051
1052 /*
1053 * writeback_inode - Helper function for ntfs_flush_inodes().
1054 *
1055 * This writes both the inode and the file data blocks, waiting
1056 * for in flight data blocks before the start of the call. It
1057 * does not wait for any io started during the call.
1058 */
writeback_inode(struct inode * inode)1059 static int writeback_inode(struct inode *inode)
1060 {
1061 int ret = sync_inode_metadata(inode, 0);
1062
1063 if (!ret)
1064 ret = filemap_fdatawrite(inode->i_mapping);
1065 return ret;
1066 }
1067
1068 /*
1069 * ntfs_flush_inodes
1070 *
1071 * Write data and metadata corresponding to i1 and i2. The io is
1072 * started but we do not wait for any of it to finish.
1073 *
1074 * filemap_flush() is used for the block device, so if there is a dirty
1075 * page for a block already in flight, we will not wait and start the
1076 * io over again.
1077 */
ntfs_flush_inodes(struct super_block * sb,struct inode * i1,struct inode * i2)1078 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1079 struct inode *i2)
1080 {
1081 int ret = 0;
1082
1083 if (i1)
1084 ret = writeback_inode(i1);
1085 if (!ret && i2)
1086 ret = writeback_inode(i2);
1087 if (!ret)
1088 ret = sync_blockdev_nowait(sb->s_bdev);
1089 return ret;
1090 }
1091
inode_write_data(struct inode * inode,const void * data,size_t bytes)1092 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1093 {
1094 pgoff_t idx;
1095
1096 /* Write non resident data. */
1097 for (idx = 0; bytes; idx++) {
1098 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1099 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1100
1101 if (IS_ERR(page))
1102 return PTR_ERR(page);
1103
1104 lock_page(page);
1105 WARN_ON(!PageUptodate(page));
1106 ClearPageUptodate(page);
1107
1108 memcpy(page_address(page), data, op);
1109
1110 flush_dcache_page(page);
1111 SetPageUptodate(page);
1112 unlock_page(page);
1113
1114 ntfs_unmap_page(page);
1115
1116 bytes -= op;
1117 data = Add2Ptr(data, PAGE_SIZE);
1118 }
1119 return 0;
1120 }
1121
1122 /*
1123 * ntfs_reparse_bytes
1124 *
1125 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1126 * for unicode string of @uni_len length.
1127 */
ntfs_reparse_bytes(u32 uni_len)1128 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1129 {
1130 /* Header + unicode string + decorated unicode string. */
1131 return sizeof(short) * (2 * uni_len + 4) +
1132 offsetof(struct REPARSE_DATA_BUFFER,
1133 SymbolicLinkReparseBuffer.PathBuffer);
1134 }
1135
1136 static struct REPARSE_DATA_BUFFER *
ntfs_create_reparse_buffer(struct ntfs_sb_info * sbi,const char * symname,u32 size,u16 * nsize)1137 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1138 u32 size, u16 *nsize)
1139 {
1140 int i, err;
1141 struct REPARSE_DATA_BUFFER *rp;
1142 __le16 *rp_name;
1143 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1144
1145 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1146 if (!rp)
1147 return ERR_PTR(-ENOMEM);
1148
1149 rs = &rp->SymbolicLinkReparseBuffer;
1150 rp_name = rs->PathBuffer;
1151
1152 /* Convert link name to UTF-16. */
1153 err = ntfs_nls_to_utf16(sbi, symname, size,
1154 (struct cpu_str *)(rp_name - 1), 2 * size,
1155 UTF16_LITTLE_ENDIAN);
1156 if (err < 0)
1157 goto out;
1158
1159 /* err = the length of unicode name of symlink. */
1160 *nsize = ntfs_reparse_bytes(err);
1161
1162 if (*nsize > sbi->reparse.max_size) {
1163 err = -EFBIG;
1164 goto out;
1165 }
1166
1167 /* Translate Linux '/' into Windows '\'. */
1168 for (i = 0; i < err; i++) {
1169 if (rp_name[i] == cpu_to_le16('/'))
1170 rp_name[i] = cpu_to_le16('\\');
1171 }
1172
1173 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1174 rp->ReparseDataLength =
1175 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1176 SymbolicLinkReparseBuffer));
1177
1178 /* PrintName + SubstituteName. */
1179 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1180 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1181 rs->PrintNameLength = rs->SubstituteNameOffset;
1182
1183 /*
1184 * TODO: Use relative path if possible to allow Windows to
1185 * parse this path.
1186 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1187 */
1188 rs->Flags = 0;
1189
1190 memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1191
1192 /* Decorate SubstituteName. */
1193 rp_name += err;
1194 rp_name[0] = cpu_to_le16('\\');
1195 rp_name[1] = cpu_to_le16('?');
1196 rp_name[2] = cpu_to_le16('?');
1197 rp_name[3] = cpu_to_le16('\\');
1198
1199 return rp;
1200 out:
1201 kfree(rp);
1202 return ERR_PTR(err);
1203 }
1204
1205 /*
1206 * ntfs_create_inode
1207 *
1208 * Helper function for:
1209 * - ntfs_create
1210 * - ntfs_mknod
1211 * - ntfs_symlink
1212 * - ntfs_mkdir
1213 * - ntfs_atomic_open
1214 *
1215 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1216 */
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)1217 struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1218 struct dentry *dentry,
1219 const struct cpu_str *uni, umode_t mode,
1220 dev_t dev, const char *symname, u32 size,
1221 struct ntfs_fnd *fnd)
1222 {
1223 int err;
1224 struct super_block *sb = dir->i_sb;
1225 struct ntfs_sb_info *sbi = sb->s_fs_info;
1226 const struct qstr *name = &dentry->d_name;
1227 CLST ino = 0;
1228 struct ntfs_inode *dir_ni = ntfs_i(dir);
1229 struct ntfs_inode *ni = NULL;
1230 struct inode *inode = NULL;
1231 struct ATTRIB *attr;
1232 struct ATTR_STD_INFO5 *std5;
1233 struct ATTR_FILE_NAME *fname;
1234 struct MFT_REC *rec;
1235 u32 asize, dsize, sd_size;
1236 enum FILE_ATTRIBUTE fa;
1237 __le32 security_id = SECURITY_ID_INVALID;
1238 CLST vcn;
1239 const void *sd;
1240 u16 t16, nsize = 0, aid = 0;
1241 struct INDEX_ROOT *root, *dir_root;
1242 struct NTFS_DE *e, *new_de = NULL;
1243 struct REPARSE_DATA_BUFFER *rp = NULL;
1244 bool rp_inserted = false;
1245
1246 if (!fnd)
1247 ni_lock_dir(dir_ni);
1248
1249 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1250 if (!dir_root) {
1251 err = -EINVAL;
1252 goto out1;
1253 }
1254
1255 if (S_ISDIR(mode)) {
1256 /* Use parent's directory attributes. */
1257 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1258 FILE_ATTRIBUTE_ARCHIVE;
1259 /*
1260 * By default child directory inherits parent attributes.
1261 * Root directory is hidden + system.
1262 * Make an exception for children in root.
1263 */
1264 if (dir->i_ino == MFT_REC_ROOT)
1265 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1266 } else if (S_ISLNK(mode)) {
1267 /* It is good idea that link should be the same type (file/dir) as target */
1268 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1269
1270 /*
1271 * Linux: there are dir/file/symlink and so on.
1272 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1273 * It is good idea to create:
1274 * dir + reparse if 'symname' points to directory
1275 * or
1276 * file + reparse if 'symname' points to file
1277 * Unfortunately kern_path hangs if symname contains 'dir'.
1278 */
1279
1280 /*
1281 * struct path path;
1282 *
1283 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1284 * struct inode *target = d_inode(path.dentry);
1285 *
1286 * if (S_ISDIR(target->i_mode))
1287 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1288 * // if ( target->i_sb == sb ){
1289 * // use relative path?
1290 * // }
1291 * path_put(&path);
1292 * }
1293 */
1294 } else if (S_ISREG(mode)) {
1295 if (sbi->options->sparse) {
1296 /* Sparsed regular file, cause option 'sparse'. */
1297 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1298 FILE_ATTRIBUTE_ARCHIVE;
1299 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1300 /* Compressed regular file, if parent is compressed. */
1301 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1302 } else {
1303 /* Regular file, default attributes. */
1304 fa = FILE_ATTRIBUTE_ARCHIVE;
1305 }
1306 } else {
1307 fa = FILE_ATTRIBUTE_ARCHIVE;
1308 }
1309
1310 /* If option "hide_dot_files" then set hidden attribute for dot files. */
1311 if (sbi->options->hide_dot_files && name->name[0] == '.')
1312 fa |= FILE_ATTRIBUTE_HIDDEN;
1313
1314 if (!(mode & 0222))
1315 fa |= FILE_ATTRIBUTE_READONLY;
1316
1317 /* Allocate PATH_MAX bytes. */
1318 new_de = __getname();
1319 if (!new_de) {
1320 err = -ENOMEM;
1321 goto out1;
1322 }
1323
1324 if (unlikely(ntfs3_forced_shutdown(sb))) {
1325 err = -EIO;
1326 goto out2;
1327 }
1328
1329 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1330 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1331
1332 /* Step 1: allocate and fill new mft record. */
1333 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1334 if (err)
1335 goto out2;
1336
1337 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1338 if (IS_ERR(ni)) {
1339 err = PTR_ERR(ni);
1340 ni = NULL;
1341 goto out3;
1342 }
1343 inode = &ni->vfs_inode;
1344 inode_init_owner(idmap, inode, dir, mode);
1345 mode = inode->i_mode;
1346
1347 ni->i_crtime = current_time(inode);
1348
1349 rec = ni->mi.mrec;
1350 rec->hard_links = cpu_to_le16(1);
1351 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1352
1353 /* Get default security id. */
1354 sd = s_default_security;
1355 sd_size = sizeof(s_default_security);
1356
1357 if (is_ntfs3(sbi)) {
1358 security_id = dir_ni->std_security_id;
1359 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1360 security_id = sbi->security.def_security_id;
1361
1362 if (security_id == SECURITY_ID_INVALID &&
1363 !ntfs_insert_security(sbi, sd, sd_size,
1364 &security_id, NULL))
1365 sbi->security.def_security_id = security_id;
1366 }
1367 }
1368
1369 /* Insert standard info. */
1370 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1371
1372 if (security_id == SECURITY_ID_INVALID) {
1373 dsize = sizeof(struct ATTR_STD_INFO);
1374 } else {
1375 dsize = sizeof(struct ATTR_STD_INFO5);
1376 std5->security_id = security_id;
1377 ni->std_security_id = security_id;
1378 }
1379 asize = SIZEOF_RESIDENT + dsize;
1380
1381 attr->type = ATTR_STD;
1382 attr->size = cpu_to_le32(asize);
1383 attr->id = cpu_to_le16(aid++);
1384 attr->res.data_off = SIZEOF_RESIDENT_LE;
1385 attr->res.data_size = cpu_to_le32(dsize);
1386
1387 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1388 kernel2nt(&ni->i_crtime);
1389
1390 std5->fa = ni->std_fa = fa;
1391
1392 attr = Add2Ptr(attr, asize);
1393
1394 /* Insert file name. */
1395 err = fill_name_de(sbi, new_de, name, uni);
1396 if (err)
1397 goto out4;
1398
1399 mi_get_ref(&ni->mi, &new_de->ref);
1400
1401 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1402
1403 if (sbi->options->windows_names &&
1404 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1405 err = -EINVAL;
1406 goto out4;
1407 }
1408
1409 mi_get_ref(&dir_ni->mi, &fname->home);
1410 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1411 fname->dup.a_time = std5->cr_time;
1412 fname->dup.alloc_size = fname->dup.data_size = 0;
1413 fname->dup.fa = std5->fa;
1414 fname->dup.ea_size = fname->dup.reparse = 0;
1415
1416 dsize = le16_to_cpu(new_de->key_size);
1417 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1418
1419 attr->type = ATTR_NAME;
1420 attr->size = cpu_to_le32(asize);
1421 attr->res.data_off = SIZEOF_RESIDENT_LE;
1422 attr->res.flags = RESIDENT_FLAG_INDEXED;
1423 attr->id = cpu_to_le16(aid++);
1424 attr->res.data_size = cpu_to_le32(dsize);
1425 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1426
1427 attr = Add2Ptr(attr, asize);
1428
1429 if (security_id == SECURITY_ID_INVALID) {
1430 /* Insert security attribute. */
1431 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1432
1433 attr->type = ATTR_SECURE;
1434 attr->size = cpu_to_le32(asize);
1435 attr->id = cpu_to_le16(aid++);
1436 attr->res.data_off = SIZEOF_RESIDENT_LE;
1437 attr->res.data_size = cpu_to_le32(sd_size);
1438 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1439
1440 attr = Add2Ptr(attr, asize);
1441 }
1442
1443 attr->id = cpu_to_le16(aid++);
1444 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1445 /*
1446 * Regular directory or symlink to directory.
1447 * Create root attribute.
1448 */
1449 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1450 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1451
1452 attr->type = ATTR_ROOT;
1453 attr->size = cpu_to_le32(asize);
1454
1455 attr->name_len = ARRAY_SIZE(I30_NAME);
1456 attr->name_off = SIZEOF_RESIDENT_LE;
1457 attr->res.data_off =
1458 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1459 attr->res.data_size = cpu_to_le32(dsize);
1460 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1461 sizeof(I30_NAME));
1462
1463 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1464 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1465 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1466 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1467 sizeof(struct NTFS_DE));
1468 root->ihdr.total = root->ihdr.used;
1469
1470 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1471 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1472 e->flags = NTFS_IE_LAST;
1473 } else if (S_ISLNK(mode)) {
1474 /*
1475 * Symlink to file.
1476 * Create empty resident data attribute.
1477 */
1478 asize = SIZEOF_RESIDENT;
1479
1480 /* Insert empty ATTR_DATA */
1481 attr->type = ATTR_DATA;
1482 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1483 attr->name_off = SIZEOF_RESIDENT_LE;
1484 attr->res.data_off = SIZEOF_RESIDENT_LE;
1485 } else if (S_ISREG(mode)) {
1486 /*
1487 * Regular file. Create empty non resident data attribute.
1488 */
1489 attr->type = ATTR_DATA;
1490 attr->non_res = 1;
1491 attr->nres.evcn = cpu_to_le64(-1ll);
1492 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1493 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1494 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1495 attr->flags = ATTR_FLAG_SPARSED;
1496 asize = SIZEOF_NONRESIDENT_EX + 8;
1497 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1498 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1499 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1500 attr->flags = ATTR_FLAG_COMPRESSED;
1501 attr->nres.c_unit = COMPRESSION_UNIT;
1502 asize = SIZEOF_NONRESIDENT_EX + 8;
1503 } else {
1504 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1505 attr->name_off = SIZEOF_NONRESIDENT_LE;
1506 asize = SIZEOF_NONRESIDENT + 8;
1507 }
1508 attr->nres.run_off = attr->name_off;
1509 } else {
1510 /*
1511 * Node. Create empty resident data attribute.
1512 */
1513 attr->type = ATTR_DATA;
1514 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1515 attr->name_off = SIZEOF_RESIDENT_LE;
1516 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1517 attr->flags = ATTR_FLAG_SPARSED;
1518 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1519 attr->flags = ATTR_FLAG_COMPRESSED;
1520 attr->res.data_off = SIZEOF_RESIDENT_LE;
1521 asize = SIZEOF_RESIDENT;
1522 ni->ni_flags |= NI_FLAG_RESIDENT;
1523 }
1524
1525 if (S_ISDIR(mode)) {
1526 ni->ni_flags |= NI_FLAG_DIR;
1527 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1528 if (err)
1529 goto out4;
1530 } else if (S_ISLNK(mode)) {
1531 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1532
1533 if (IS_ERR(rp)) {
1534 err = PTR_ERR(rp);
1535 rp = NULL;
1536 goto out4;
1537 }
1538
1539 /*
1540 * Insert ATTR_REPARSE.
1541 */
1542 attr = Add2Ptr(attr, asize);
1543 attr->type = ATTR_REPARSE;
1544 attr->id = cpu_to_le16(aid++);
1545
1546 /* Resident or non resident? */
1547 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1548 t16 = PtrOffset(rec, attr);
1549
1550 /*
1551 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1552 * It is good idea to keep extened attributes resident.
1553 */
1554 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1555 CLST alen;
1556 CLST clst = bytes_to_cluster(sbi, nsize);
1557
1558 /* Bytes per runs. */
1559 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1560
1561 attr->non_res = 1;
1562 attr->nres.evcn = cpu_to_le64(clst - 1);
1563 attr->name_off = SIZEOF_NONRESIDENT_LE;
1564 attr->nres.run_off = attr->name_off;
1565 attr->nres.data_size = cpu_to_le64(nsize);
1566 attr->nres.valid_size = attr->nres.data_size;
1567 attr->nres.alloc_size =
1568 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1569
1570 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1571 clst, NULL, ALLOCATE_DEF,
1572 &alen, 0, NULL, NULL);
1573 if (err)
1574 goto out5;
1575
1576 err = run_pack(&ni->file.run, 0, clst,
1577 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1578 &vcn);
1579 if (err < 0)
1580 goto out5;
1581
1582 if (vcn != clst) {
1583 err = -EINVAL;
1584 goto out5;
1585 }
1586
1587 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1588 /* Write non resident data. */
1589 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1590 nsize, 0);
1591 if (err)
1592 goto out5;
1593 } else {
1594 attr->res.data_off = SIZEOF_RESIDENT_LE;
1595 attr->res.data_size = cpu_to_le32(nsize);
1596 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1597 }
1598 /* Size of symlink equals the length of input string. */
1599 inode->i_size = size;
1600
1601 attr->size = cpu_to_le32(asize);
1602
1603 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1604 &new_de->ref);
1605 if (err)
1606 goto out5;
1607
1608 rp_inserted = true;
1609 }
1610
1611 attr = Add2Ptr(attr, asize);
1612 attr->type = ATTR_END;
1613
1614 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1615 rec->next_attr_id = cpu_to_le16(aid);
1616
1617 inode->i_generation = le16_to_cpu(rec->seq);
1618
1619 if (S_ISDIR(mode)) {
1620 inode->i_op = &ntfs_dir_inode_operations;
1621 inode->i_fop = &ntfs_dir_operations;
1622 } else if (S_ISLNK(mode)) {
1623 inode->i_op = &ntfs_link_inode_operations;
1624 inode->i_fop = NULL;
1625 inode->i_mapping->a_ops = &ntfs_aops;
1626 inode->i_size = size;
1627 inode_nohighmem(inode);
1628 } else if (S_ISREG(mode)) {
1629 inode->i_op = &ntfs_file_inode_operations;
1630 inode->i_fop = &ntfs_file_operations;
1631 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1632 &ntfs_aops;
1633 init_rwsem(&ni->file.run_lock);
1634 } else {
1635 inode->i_op = &ntfs_special_inode_operations;
1636 init_special_inode(inode, mode, dev);
1637 }
1638
1639 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1640 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1641 err = ntfs_init_acl(idmap, inode, dir);
1642 if (err)
1643 goto out5;
1644 } else
1645 #endif
1646 {
1647 inode->i_flags |= S_NOSEC;
1648 }
1649
1650 /*
1651 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1652 * The packed size of extended attribute is stored in direntry too.
1653 * 'fname' here points to inside new_de.
1654 */
1655 ntfs_save_wsl_perm(inode, &fname->dup.ea_size);
1656
1657 /*
1658 * update ea_size in file_name attribute too.
1659 * Use ni_find_attr cause layout of MFT record may be changed
1660 * in ntfs_init_acl and ntfs_save_wsl_perm.
1661 */
1662 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
1663 if (attr) {
1664 struct ATTR_FILE_NAME *fn;
1665
1666 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1667 if (fn)
1668 fn->dup.ea_size = fname->dup.ea_size;
1669 }
1670
1671 /* We do not need to update parent directory later */
1672 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1673
1674 /* Step 2: Add new name in index. */
1675 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1676 if (err)
1677 goto out6;
1678
1679 /*
1680 * Call 'd_instantiate' after inode->i_op is set
1681 * but before finish_open.
1682 */
1683 d_instantiate(dentry, inode);
1684
1685 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1686 inode->i_atime = inode->i_mtime =
1687 inode_set_ctime_to_ts(inode, ni->i_crtime);
1688 dir->i_mtime = inode_set_ctime_to_ts(dir, ni->i_crtime);
1689
1690 mark_inode_dirty(dir);
1691 mark_inode_dirty(inode);
1692
1693 /* Normal exit. */
1694 goto out2;
1695
1696 out6:
1697 if (rp_inserted)
1698 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1699
1700 out5:
1701 if (!S_ISDIR(mode))
1702 run_deallocate(sbi, &ni->file.run, false);
1703
1704 out4:
1705 clear_rec_inuse(rec);
1706 clear_nlink(inode);
1707 ni->mi.dirty = false;
1708 discard_new_inode(inode);
1709 out3:
1710 ntfs_mark_rec_free(sbi, ino, false);
1711
1712 out2:
1713 __putname(new_de);
1714 kfree(rp);
1715
1716 out1:
1717 if (!fnd)
1718 ni_unlock(dir_ni);
1719
1720 if (err)
1721 return ERR_PTR(err);
1722
1723 unlock_new_inode(inode);
1724
1725 return inode;
1726 }
1727
ntfs_link_inode(struct inode * inode,struct dentry * dentry)1728 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1729 {
1730 int err;
1731 struct ntfs_inode *ni = ntfs_i(inode);
1732 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1733 struct NTFS_DE *de;
1734
1735 /* Allocate PATH_MAX bytes. */
1736 de = __getname();
1737 if (!de)
1738 return -ENOMEM;
1739
1740 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1741 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1742
1743 /* Construct 'de'. */
1744 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1745 if (err)
1746 goto out;
1747
1748 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1749 out:
1750 __putname(de);
1751 return err;
1752 }
1753
1754 /*
1755 * ntfs_unlink_inode
1756 *
1757 * inode_operations::unlink
1758 * inode_operations::rmdir
1759 */
ntfs_unlink_inode(struct inode * dir,const struct dentry * dentry)1760 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1761 {
1762 int err;
1763 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1764 struct inode *inode = d_inode(dentry);
1765 struct ntfs_inode *ni = ntfs_i(inode);
1766 struct ntfs_inode *dir_ni = ntfs_i(dir);
1767 struct NTFS_DE *de, *de2 = NULL;
1768 int undo_remove;
1769
1770 if (ntfs_is_meta_file(sbi, ni->mi.rno))
1771 return -EINVAL;
1772
1773 /* Allocate PATH_MAX bytes. */
1774 de = __getname();
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 dir->i_mtime = 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 __putname(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 invalidate_inode_buffers(inode);
1819 clear_inode(inode);
1820
1821 ni_clear(ntfs_i(inode));
1822 }
1823
1824 /*
1825 * ntfs_translate_junction
1826 *
1827 * Translate a Windows junction target to the Linux equivalent.
1828 * On junctions, targets are always absolute (they include the drive
1829 * letter). We have no way of knowing if the target is for the current
1830 * mounted device or not so we just assume it is.
1831 */
ntfs_translate_junction(const struct super_block * sb,const struct dentry * link_de,char * target,int target_len,int target_max)1832 static int ntfs_translate_junction(const struct super_block *sb,
1833 const struct dentry *link_de, char *target,
1834 int target_len, int target_max)
1835 {
1836 int tl_len, err = target_len;
1837 char *link_path_buffer = NULL, *link_path;
1838 char *translated = NULL;
1839 char *target_start;
1840 int copy_len;
1841
1842 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1843 if (!link_path_buffer) {
1844 err = -ENOMEM;
1845 goto out;
1846 }
1847 /* Get link path, relative to mount point */
1848 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1849 if (IS_ERR(link_path)) {
1850 ntfs_err(sb, "Error getting link path");
1851 err = -EINVAL;
1852 goto out;
1853 }
1854
1855 translated = kmalloc(PATH_MAX, GFP_NOFS);
1856 if (!translated) {
1857 err = -ENOMEM;
1858 goto out;
1859 }
1860
1861 /* Make translated path a relative path to mount point */
1862 strcpy(translated, "./");
1863 ++link_path; /* Skip leading / */
1864 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1865 if (*link_path == '/') {
1866 if (PATH_MAX - tl_len < sizeof("../")) {
1867 ntfs_err(sb,
1868 "Link path %s has too many components",
1869 link_path);
1870 err = -EINVAL;
1871 goto out;
1872 }
1873 strcpy(translated + tl_len, "../");
1874 tl_len += sizeof("../") - 1;
1875 }
1876 }
1877
1878 /* Skip drive letter */
1879 target_start = target;
1880 while (*target_start && *target_start != ':')
1881 ++target_start;
1882
1883 if (!*target_start) {
1884 ntfs_err(sb, "Link target (%s) missing drive separator",
1885 target);
1886 err = -EINVAL;
1887 goto out;
1888 }
1889
1890 /* Skip drive separator and leading /, if exists */
1891 target_start += 1 + (target_start[1] == '/');
1892 copy_len = target_len - (target_start - target);
1893
1894 if (PATH_MAX - tl_len <= copy_len) {
1895 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1896 target_start, PATH_MAX - tl_len, copy_len);
1897 err = -EINVAL;
1898 goto out;
1899 }
1900
1901 /* translated path has a trailing / and target_start does not */
1902 strcpy(translated + tl_len, target_start);
1903 tl_len += copy_len;
1904 if (target_max <= tl_len) {
1905 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1906 translated, target_max, tl_len);
1907 err = -EINVAL;
1908 goto out;
1909 }
1910 strcpy(target, translated);
1911 err = tl_len;
1912
1913 out:
1914 kfree(link_path_buffer);
1915 kfree(translated);
1916 return err;
1917 }
1918
ntfs_readlink_hlp(const struct dentry * link_de,struct inode * inode,char * buffer,int buflen)1919 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1920 struct inode *inode, char *buffer,
1921 int buflen)
1922 {
1923 int i, err = -EINVAL;
1924 struct ntfs_inode *ni = ntfs_i(inode);
1925 struct super_block *sb = inode->i_sb;
1926 struct ntfs_sb_info *sbi = sb->s_fs_info;
1927 u64 size;
1928 u16 ulen = 0;
1929 void *to_free = NULL;
1930 struct REPARSE_DATA_BUFFER *rp;
1931 const __le16 *uname;
1932 struct ATTRIB *attr;
1933
1934 /* Reparse data present. Try to parse it. */
1935 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1936 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1937
1938 *buffer = 0;
1939
1940 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1941 if (!attr)
1942 goto out;
1943
1944 if (!attr->non_res) {
1945 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1946 if (!rp)
1947 goto out;
1948 size = le32_to_cpu(attr->res.data_size);
1949 } else {
1950 size = le64_to_cpu(attr->nres.data_size);
1951 rp = NULL;
1952 }
1953
1954 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1955 goto out;
1956
1957 if (!rp) {
1958 rp = kmalloc(size, GFP_NOFS);
1959 if (!rp) {
1960 err = -ENOMEM;
1961 goto out;
1962 }
1963 to_free = rp;
1964 /* Read into temporal buffer. */
1965 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1966 if (err)
1967 goto out;
1968 }
1969
1970 /* Microsoft Tag. */
1971 switch (rp->ReparseTag) {
1972 case IO_REPARSE_TAG_MOUNT_POINT:
1973 /* Mount points and junctions. */
1974 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1975 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1976 MountPointReparseBuffer.PathBuffer))
1977 goto out;
1978 uname = Add2Ptr(rp,
1979 offsetof(struct REPARSE_DATA_BUFFER,
1980 MountPointReparseBuffer.PathBuffer) +
1981 le16_to_cpu(rp->MountPointReparseBuffer
1982 .PrintNameOffset));
1983 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1984 break;
1985
1986 case IO_REPARSE_TAG_SYMLINK:
1987 /* FolderSymbolicLink */
1988 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1989 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1990 SymbolicLinkReparseBuffer.PathBuffer))
1991 goto out;
1992 uname = Add2Ptr(
1993 rp, offsetof(struct REPARSE_DATA_BUFFER,
1994 SymbolicLinkReparseBuffer.PathBuffer) +
1995 le16_to_cpu(rp->SymbolicLinkReparseBuffer
1996 .PrintNameOffset));
1997 ulen = le16_to_cpu(
1998 rp->SymbolicLinkReparseBuffer.PrintNameLength);
1999 break;
2000
2001 case IO_REPARSE_TAG_CLOUD:
2002 case IO_REPARSE_TAG_CLOUD_1:
2003 case IO_REPARSE_TAG_CLOUD_2:
2004 case IO_REPARSE_TAG_CLOUD_3:
2005 case IO_REPARSE_TAG_CLOUD_4:
2006 case IO_REPARSE_TAG_CLOUD_5:
2007 case IO_REPARSE_TAG_CLOUD_6:
2008 case IO_REPARSE_TAG_CLOUD_7:
2009 case IO_REPARSE_TAG_CLOUD_8:
2010 case IO_REPARSE_TAG_CLOUD_9:
2011 case IO_REPARSE_TAG_CLOUD_A:
2012 case IO_REPARSE_TAG_CLOUD_B:
2013 case IO_REPARSE_TAG_CLOUD_C:
2014 case IO_REPARSE_TAG_CLOUD_D:
2015 case IO_REPARSE_TAG_CLOUD_E:
2016 case IO_REPARSE_TAG_CLOUD_F:
2017 err = sizeof("OneDrive") - 1;
2018 if (err > buflen)
2019 err = buflen;
2020 memcpy(buffer, "OneDrive", err);
2021 goto out;
2022
2023 default:
2024 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2025 /* Unknown Microsoft Tag. */
2026 goto out;
2027 }
2028 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2029 size <= sizeof(struct REPARSE_POINT)) {
2030 goto out;
2031 }
2032
2033 /* Users tag. */
2034 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2035 ulen = le16_to_cpu(rp->ReparseDataLength) -
2036 sizeof(struct REPARSE_POINT);
2037 }
2038
2039 /* Convert nlen from bytes to UNICODE chars. */
2040 ulen >>= 1;
2041
2042 /* Check that name is available. */
2043 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2044 goto out;
2045
2046 /* If name is already zero terminated then truncate it now. */
2047 if (!uname[ulen - 1])
2048 ulen -= 1;
2049
2050 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2051
2052 if (err < 0)
2053 goto out;
2054
2055 /* Translate Windows '\' into Linux '/'. */
2056 for (i = 0; i < err; i++) {
2057 if (buffer[i] == '\\')
2058 buffer[i] = '/';
2059 }
2060
2061 /* Always set last zero. */
2062 buffer[err] = 0;
2063
2064 /* If this is a junction, translate the link target. */
2065 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2066 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2067
2068 out:
2069 kfree(to_free);
2070 return err;
2071 }
2072
ntfs_get_link(struct dentry * de,struct inode * inode,struct delayed_call * done)2073 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2074 struct delayed_call *done)
2075 {
2076 int err;
2077 char *ret;
2078
2079 if (!de)
2080 return ERR_PTR(-ECHILD);
2081
2082 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2083 if (!ret)
2084 return ERR_PTR(-ENOMEM);
2085
2086 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2087 if (err < 0) {
2088 kfree(ret);
2089 return ERR_PTR(err);
2090 }
2091
2092 set_delayed_call(done, kfree_link, ret);
2093
2094 return ret;
2095 }
2096
2097 // clang-format off
2098 const struct inode_operations ntfs_link_inode_operations = {
2099 .get_link = ntfs_get_link,
2100 .setattr = ntfs3_setattr,
2101 .listxattr = ntfs_listxattr,
2102 };
2103
2104 const struct address_space_operations ntfs_aops = {
2105 .read_folio = ntfs_read_folio,
2106 .readahead = ntfs_readahead,
2107 .writepages = ntfs_writepages,
2108 .write_begin = ntfs_write_begin,
2109 .write_end = ntfs_write_end,
2110 .direct_IO = ntfs_direct_IO,
2111 .bmap = ntfs_bmap,
2112 .dirty_folio = block_dirty_folio,
2113 .migrate_folio = buffer_migrate_folio,
2114 .invalidate_folio = block_invalidate_folio,
2115 };
2116
2117 const struct address_space_operations ntfs_aops_cmpr = {
2118 .read_folio = ntfs_read_folio,
2119 .readahead = ntfs_readahead,
2120 };
2121 // clang-format on
2122