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