1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 *
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
5 *
6 */
7
8 #include <linux/buffer_head.h>
9 #include <linux/fs.h>
10 #include <linux/mpage.h>
11 #include <linux/namei.h>
12 #include <linux/nls.h>
13 #include <linux/uio.h>
14 #include <linux/writeback.h>
15
16 #include "debug.h"
17 #include "ntfs.h"
18 #include "ntfs_fs.h"
19
20 /*
21 * ntfs_read_mft - Read record and parse MFT.
22 */
ntfs_read_mft(struct inode * inode,const struct cpu_str * name,const struct MFT_REF * ref)23 static struct inode *ntfs_read_mft(struct inode *inode,
24 const struct cpu_str *name,
25 const struct MFT_REF *ref)
26 {
27 int err = 0;
28 struct ntfs_inode *ni = ntfs_i(inode);
29 struct super_block *sb = inode->i_sb;
30 struct ntfs_sb_info *sbi = sb->s_fs_info;
31 mode_t mode = 0;
32 struct ATTR_STD_INFO5 *std5 = NULL;
33 struct ATTR_LIST_ENTRY *le;
34 struct ATTRIB *attr;
35 bool is_match = false;
36 bool is_root = false;
37 bool is_dir;
38 unsigned long ino = inode->i_ino;
39 u32 rp_fa = 0, asize, t32;
40 u16 roff, rsize, names = 0, links = 0;
41 const struct ATTR_FILE_NAME *fname = NULL;
42 const struct INDEX_ROOT *root;
43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
44 u64 t64;
45 struct MFT_REC *rec;
46 struct runs_tree *run;
47 struct timespec64 ts;
48
49 inode->i_op = NULL;
50 /* Setup 'uid' and 'gid' */
51 inode->i_uid = sbi->options->fs_uid;
52 inode->i_gid = sbi->options->fs_gid;
53
54 err = mi_init(&ni->mi, sbi, ino);
55 if (err)
56 goto out;
57
58 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
59 t64 = sbi->mft.lbo >> sbi->cluster_bits;
60 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
61 sbi->mft.ni = ni;
62 init_rwsem(&ni->file.run_lock);
63
64 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
65 err = -ENOMEM;
66 goto out;
67 }
68 }
69
70 err = mi_read(&ni->mi, ino == MFT_REC_MFT);
71
72 if (err)
73 goto out;
74
75 rec = ni->mi.mrec;
76
77 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
78 ;
79 } else if (ref->seq != rec->seq) {
80 err = -EINVAL;
81 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
82 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
83 goto out;
84 } else if (!is_rec_inuse(rec)) {
85 err = -ESTALE;
86 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
87 goto out;
88 }
89
90 if (le32_to_cpu(rec->total) != sbi->record_size) {
91 /* Bad inode? */
92 err = -EINVAL;
93 goto out;
94 }
95
96 if (!is_rec_base(rec)) {
97 err = -EINVAL;
98 goto out;
99 }
100
101 /* Record should contain $I30 root. */
102 is_dir = rec->flags & RECORD_FLAG_DIR;
103
104 /* MFT_REC_MFT is not a dir */
105 if (is_dir && ino == MFT_REC_MFT) {
106 err = -EINVAL;
107 goto out;
108 }
109
110 inode->i_generation = le16_to_cpu(rec->seq);
111
112 /* Enumerate all struct Attributes MFT. */
113 le = NULL;
114 attr = NULL;
115
116 /*
117 * To reduce tab pressure use goto instead of
118 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
119 */
120 next_attr:
121 run = NULL;
122 err = -EINVAL;
123 attr = ni_enum_attr_ex(ni, attr, &le, NULL);
124 if (!attr)
125 goto end_enum;
126
127 if (le && le->vcn) {
128 /* This is non primary attribute segment. Ignore if not MFT. */
129 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
130 goto next_attr;
131
132 run = &ni->file.run;
133 asize = le32_to_cpu(attr->size);
134 goto attr_unpack_run;
135 }
136
137 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
138 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
139 asize = le32_to_cpu(attr->size);
140
141 /*
142 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'.
143 * There not critical to check this case again
144 */
145 if (attr->name_len &&
146 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) >
147 asize)
148 goto out;
149
150 if (attr->non_res) {
151 t64 = le64_to_cpu(attr->nres.alloc_size);
152 if (le64_to_cpu(attr->nres.data_size) > t64 ||
153 le64_to_cpu(attr->nres.valid_size) > t64)
154 goto out;
155 }
156
157 switch (attr->type) {
158 case ATTR_STD:
159 if (attr->non_res ||
160 asize < sizeof(struct ATTR_STD_INFO) + roff ||
161 rsize < sizeof(struct ATTR_STD_INFO))
162 goto out;
163
164 if (std5)
165 goto next_attr;
166
167 std5 = Add2Ptr(attr, roff);
168
169 #ifdef STATX_BTIME
170 nt2kernel(std5->cr_time, &ni->i_crtime);
171 #endif
172 nt2kernel(std5->a_time, &ts);
173 inode_set_atime_to_ts(inode, ts);
174 nt2kernel(std5->c_time, &ts);
175 inode_set_ctime_to_ts(inode, ts);
176 nt2kernel(std5->m_time, &ts);
177 inode_set_mtime_to_ts(inode, ts);
178
179 ni->std_fa = std5->fa;
180
181 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
182 rsize >= sizeof(struct ATTR_STD_INFO5))
183 ni->std_security_id = std5->security_id;
184 goto next_attr;
185
186 case ATTR_LIST:
187 if (attr->name_len || le || ino == MFT_REC_LOG)
188 goto out;
189
190 err = ntfs_load_attr_list(ni, attr);
191 if (err)
192 goto out;
193
194 le = NULL;
195 attr = NULL;
196 goto next_attr;
197
198 case ATTR_NAME:
199 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
200 rsize < SIZEOF_ATTRIBUTE_FILENAME)
201 goto out;
202
203 names += 1;
204 fname = Add2Ptr(attr, roff);
205 if (fname->type == FILE_NAME_DOS)
206 goto next_attr;
207
208 links += 1;
209 if (name && name->len == fname->name_len &&
210 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
211 NULL, false))
212 is_match = true;
213
214 goto next_attr;
215
216 case ATTR_DATA:
217 if (is_dir) {
218 /* Ignore data attribute in dir record. */
219 goto next_attr;
220 }
221
222 if (ino == MFT_REC_BADCLUST && !attr->non_res)
223 goto next_attr;
224
225 if (attr->name_len &&
226 ((ino != MFT_REC_BADCLUST || !attr->non_res ||
227 attr->name_len != ARRAY_SIZE(BAD_NAME) ||
228 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
229 (ino != MFT_REC_SECURE || !attr->non_res ||
230 attr->name_len != ARRAY_SIZE(SDS_NAME) ||
231 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
232 /* File contains stream attribute. Ignore it. */
233 goto next_attr;
234 }
235
236 if (is_attr_sparsed(attr))
237 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
238 else
239 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
240
241 if (is_attr_compressed(attr))
242 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
243 else
244 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
245
246 if (is_attr_encrypted(attr))
247 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
248 else
249 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
250
251 if (!attr->non_res) {
252 ni->i_valid = inode->i_size = rsize;
253 inode_set_bytes(inode, rsize);
254 }
255
256 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
257
258 if (!attr->non_res) {
259 ni->ni_flags |= NI_FLAG_RESIDENT;
260 goto next_attr;
261 }
262
263 inode_set_bytes(inode, attr_ondisk_size(attr));
264
265 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
266 inode->i_size = le64_to_cpu(attr->nres.data_size);
267 if (!attr->nres.alloc_size)
268 goto next_attr;
269
270 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
271 &ni->file.run;
272 break;
273
274 case ATTR_ROOT:
275 if (attr->non_res)
276 goto out;
277
278 root = Add2Ptr(attr, roff);
279
280 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
281 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
282 goto next_attr;
283
284 if (root->type != ATTR_NAME ||
285 root->rule != NTFS_COLLATION_TYPE_FILENAME)
286 goto out;
287
288 if (!is_dir)
289 goto next_attr;
290
291 is_root = true;
292 ni->ni_flags |= NI_FLAG_DIR;
293
294 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
295 if (err)
296 goto out;
297
298 mode = sb->s_root ?
299 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
300 (S_IFDIR | 0777);
301 goto next_attr;
302
303 case ATTR_ALLOC:
304 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
305 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
306 goto next_attr;
307
308 inode->i_size = le64_to_cpu(attr->nres.data_size);
309 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
310 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
311
312 run = &ni->dir.alloc_run;
313 break;
314
315 case ATTR_BITMAP:
316 if (ino == MFT_REC_MFT) {
317 if (!attr->non_res)
318 goto out;
319 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
320 /* 0x20000000 = 2^32 / 8 */
321 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
322 goto out;
323 #endif
324 run = &sbi->mft.bitmap.run;
325 break;
326 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
327 !memcmp(attr_name(attr), I30_NAME,
328 sizeof(I30_NAME)) &&
329 attr->non_res) {
330 run = &ni->dir.bitmap_run;
331 break;
332 }
333 goto next_attr;
334
335 case ATTR_REPARSE:
336 if (attr->name_len)
337 goto next_attr;
338
339 rp_fa = ni_parse_reparse(ni, attr, &rp);
340 switch (rp_fa) {
341 case REPARSE_LINK:
342 /*
343 * Normal symlink.
344 * Assume one unicode symbol == one utf8.
345 */
346 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
347 .PrintNameLength) /
348 sizeof(u16);
349 ni->i_valid = inode->i_size;
350 /* Clear directory bit. */
351 if (ni->ni_flags & NI_FLAG_DIR) {
352 indx_clear(&ni->dir);
353 memset(&ni->dir, 0, sizeof(ni->dir));
354 ni->ni_flags &= ~NI_FLAG_DIR;
355 } else {
356 run_close(&ni->file.run);
357 }
358 mode = S_IFLNK | 0777;
359 is_dir = false;
360 if (attr->non_res) {
361 run = &ni->file.run;
362 goto attr_unpack_run; // Double break.
363 }
364 break;
365
366 case REPARSE_COMPRESSED:
367 break;
368
369 case REPARSE_DEDUPLICATED:
370 break;
371 }
372 goto next_attr;
373
374 case ATTR_EA_INFO:
375 if (!attr->name_len &&
376 resident_data_ex(attr, sizeof(struct EA_INFO))) {
377 ni->ni_flags |= NI_FLAG_EA;
378 /*
379 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
380 */
381 inode->i_mode = mode;
382 ntfs_get_wsl_perm(inode);
383 mode = inode->i_mode;
384 }
385 goto next_attr;
386
387 default:
388 goto next_attr;
389 }
390
391 attr_unpack_run:
392 roff = le16_to_cpu(attr->nres.run_off);
393
394 if (roff > asize) {
395 err = -EINVAL;
396 goto out;
397 }
398
399 t64 = le64_to_cpu(attr->nres.svcn);
400
401 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
402 t64, Add2Ptr(attr, roff), asize - roff);
403 if (err < 0)
404 goto out;
405 err = 0;
406 goto next_attr;
407
408 end_enum:
409
410 if (!std5)
411 goto out;
412
413 if (is_bad_inode(inode))
414 goto out;
415
416 if (!is_match && name) {
417 err = -ENOENT;
418 goto out;
419 }
420
421 if (std5->fa & FILE_ATTRIBUTE_READONLY)
422 mode &= ~0222;
423
424 if (!names) {
425 err = -EINVAL;
426 goto out;
427 }
428
429 if (names != le16_to_cpu(rec->hard_links)) {
430 /* Correct minor error on the fly. Do not mark inode as dirty. */
431 ntfs_inode_warn(inode, "Correct links count -> %u.", names);
432 rec->hard_links = cpu_to_le16(names);
433 ni->mi.dirty = true;
434 }
435
436 set_nlink(inode, links);
437
438 if (S_ISDIR(mode)) {
439 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
440
441 /*
442 * Dot and dot-dot should be included in count but was not
443 * included in enumeration.
444 * Usually a hard links to directories are disabled.
445 */
446 inode->i_op = &ntfs_dir_inode_operations;
447 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
448 &ntfs_legacy_dir_operations :
449 &ntfs_dir_operations;
450 ni->i_valid = 0;
451 } else if (S_ISLNK(mode)) {
452 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
453 inode->i_op = &ntfs_link_inode_operations;
454 inode->i_fop = NULL;
455 inode_nohighmem(inode);
456 } else if (S_ISREG(mode)) {
457 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
458 inode->i_op = &ntfs_file_inode_operations;
459 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
460 &ntfs_legacy_file_operations :
461 &ntfs_file_operations;
462 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
463 &ntfs_aops;
464 if (ino != MFT_REC_MFT)
465 init_rwsem(&ni->file.run_lock);
466 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
467 S_ISSOCK(mode)) {
468 inode->i_op = &ntfs_special_inode_operations;
469 init_special_inode(inode, mode, inode->i_rdev);
470 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
471 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
472 /* Records in $Extend are not a files or general directories. */
473 inode->i_op = &ntfs_file_inode_operations;
474 } else {
475 err = -EINVAL;
476 goto out;
477 }
478
479 if ((sbi->options->sys_immutable &&
480 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
481 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
482 inode->i_flags |= S_IMMUTABLE;
483 } else {
484 inode->i_flags &= ~S_IMMUTABLE;
485 }
486
487 inode->i_mode = mode;
488 if (!(ni->ni_flags & NI_FLAG_EA)) {
489 /* If no xattr then no security (stored in xattr). */
490 inode->i_flags |= S_NOSEC;
491 }
492
493 if (ino == MFT_REC_MFT && !sb->s_root)
494 sbi->mft.ni = NULL;
495
496 unlock_new_inode(inode);
497
498 return inode;
499
500 out:
501 if (ino == MFT_REC_MFT && !sb->s_root)
502 sbi->mft.ni = NULL;
503
504 iget_failed(inode);
505 return ERR_PTR(err);
506 }
507
508 /*
509 * ntfs_test_inode
510 *
511 * Return: 1 if match.
512 */
ntfs_test_inode(struct inode * inode,void * data)513 static int ntfs_test_inode(struct inode *inode, void *data)
514 {
515 struct MFT_REF *ref = data;
516
517 return ino_get(ref) == inode->i_ino;
518 }
519
ntfs_set_inode(struct inode * inode,void * data)520 static int ntfs_set_inode(struct inode *inode, void *data)
521 {
522 const struct MFT_REF *ref = data;
523
524 inode->i_ino = ino_get(ref);
525 return 0;
526 }
527
ntfs_iget5(struct super_block * sb,const struct MFT_REF * ref,const struct cpu_str * name)528 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
529 const struct cpu_str *name)
530 {
531 struct inode *inode;
532
533 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
534 (void *)ref);
535 if (unlikely(!inode))
536 return ERR_PTR(-ENOMEM);
537
538 /* If this is a freshly allocated inode, need to read it now. */
539 if (inode->i_state & I_NEW)
540 inode = ntfs_read_mft(inode, name, ref);
541 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
542 /*
543 * Sequence number is not expected.
544 * Looks like inode was reused but caller uses the old reference
545 */
546 iput(inode);
547 inode = ERR_PTR(-ESTALE);
548 }
549
550 if (IS_ERR(inode))
551 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
552
553 return inode;
554 }
555
556 enum get_block_ctx {
557 GET_BLOCK_GENERAL = 0,
558 GET_BLOCK_WRITE_BEGIN = 1,
559 GET_BLOCK_DIRECT_IO_R = 2,
560 GET_BLOCK_DIRECT_IO_W = 3,
561 GET_BLOCK_BMAP = 4,
562 };
563
ntfs_get_block_vbo(struct inode * inode,u64 vbo,struct buffer_head * bh,int create,enum get_block_ctx ctx)564 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
565 struct buffer_head *bh, int create,
566 enum get_block_ctx ctx)
567 {
568 struct super_block *sb = inode->i_sb;
569 struct ntfs_sb_info *sbi = sb->s_fs_info;
570 struct ntfs_inode *ni = ntfs_i(inode);
571 struct folio *folio = bh->b_folio;
572 u8 cluster_bits = sbi->cluster_bits;
573 u32 block_size = sb->s_blocksize;
574 u64 bytes, lbo, valid;
575 u32 off;
576 int err;
577 CLST vcn, lcn, len;
578 bool new;
579
580 /* Clear previous state. */
581 clear_buffer_new(bh);
582 clear_buffer_uptodate(bh);
583
584 if (is_resident(ni)) {
585 bh->b_blocknr = RESIDENT_LCN;
586 bh->b_size = block_size;
587 if (!folio) {
588 /* direct io (read) or bmap call */
589 err = 0;
590 } else {
591 ni_lock(ni);
592 err = attr_data_read_resident(ni, folio);
593 ni_unlock(ni);
594
595 if (!err)
596 set_buffer_uptodate(bh);
597 }
598 return err;
599 }
600
601 vcn = vbo >> cluster_bits;
602 off = vbo & sbi->cluster_mask;
603 new = false;
604
605 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
606 create && sbi->cluster_size > PAGE_SIZE);
607 if (err)
608 goto out;
609
610 if (!len)
611 return 0;
612
613 bytes = ((u64)len << cluster_bits) - off;
614
615 if (lcn >= sbi->used.bitmap.nbits) {
616 /* This case includes resident/compressed/sparse. */
617 if (!create) {
618 if (bh->b_size > bytes)
619 bh->b_size = bytes;
620 return 0;
621 }
622 WARN_ON(1);
623 }
624
625 if (new)
626 set_buffer_new(bh);
627
628 lbo = ((u64)lcn << cluster_bits) + off;
629
630 set_buffer_mapped(bh);
631 bh->b_bdev = sb->s_bdev;
632 bh->b_blocknr = lbo >> sb->s_blocksize_bits;
633
634 valid = ni->i_valid;
635
636 if (ctx == GET_BLOCK_DIRECT_IO_W) {
637 /* ntfs_direct_IO will update ni->i_valid. */
638 if (vbo >= valid)
639 set_buffer_new(bh);
640 } else if (create) {
641 /* Normal write. */
642 if (bytes > bh->b_size)
643 bytes = bh->b_size;
644
645 if (vbo >= valid)
646 set_buffer_new(bh);
647
648 if (vbo + bytes > valid) {
649 ni->i_valid = vbo + bytes;
650 mark_inode_dirty(inode);
651 }
652 } else if (vbo >= valid) {
653 /* Read out of valid data. */
654 clear_buffer_mapped(bh);
655 } else if (vbo + bytes <= valid) {
656 /* Normal read. */
657 } else if (vbo + block_size <= valid) {
658 /* Normal short read. */
659 bytes = block_size;
660 } else {
661 /*
662 * Read across valid size: vbo < valid && valid < vbo + block_size
663 */
664 bytes = block_size;
665
666 if (folio) {
667 u32 voff = valid - vbo;
668
669 bh->b_size = block_size;
670 off = vbo & (PAGE_SIZE - 1);
671 folio_set_bh(bh, folio, off);
672
673 if (bh_read(bh, 0) < 0) {
674 err = -EIO;
675 goto out;
676 }
677 folio_zero_segment(folio, off + voff, off + block_size);
678 }
679 }
680
681 if (bh->b_size > bytes)
682 bh->b_size = bytes;
683
684 #ifndef __LP64__
685 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
686 static_assert(sizeof(size_t) < sizeof(loff_t));
687 if (bytes > 0x40000000u)
688 bh->b_size = 0x40000000u;
689 }
690 #endif
691
692 return 0;
693
694 out:
695 return err;
696 }
697
ntfs_get_block(struct inode * inode,sector_t vbn,struct buffer_head * bh_result,int create)698 int ntfs_get_block(struct inode *inode, sector_t vbn,
699 struct buffer_head *bh_result, int create)
700 {
701 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
702 bh_result, create, GET_BLOCK_GENERAL);
703 }
704
ntfs_get_block_bmap(struct inode * inode,sector_t vsn,struct buffer_head * bh_result,int create)705 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
706 struct buffer_head *bh_result, int create)
707 {
708 return ntfs_get_block_vbo(inode,
709 (u64)vsn << inode->i_sb->s_blocksize_bits,
710 bh_result, create, GET_BLOCK_BMAP);
711 }
712
ntfs_bmap(struct address_space * mapping,sector_t block)713 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
714 {
715 return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
716 }
717
ntfs_read_folio(struct file * file,struct folio * folio)718 static int ntfs_read_folio(struct file *file, struct folio *folio)
719 {
720 int err;
721 struct address_space *mapping = folio->mapping;
722 struct inode *inode = mapping->host;
723 struct ntfs_inode *ni = ntfs_i(inode);
724
725 if (is_resident(ni)) {
726 ni_lock(ni);
727 err = attr_data_read_resident(ni, folio);
728 ni_unlock(ni);
729 if (err != E_NTFS_NONRESIDENT) {
730 folio_unlock(folio);
731 return err;
732 }
733 }
734
735 if (is_compressed(ni)) {
736 ni_lock(ni);
737 err = ni_readpage_cmpr(ni, folio);
738 ni_unlock(ni);
739 return err;
740 }
741
742 /* Normal + sparse files. */
743 return mpage_read_folio(folio, ntfs_get_block);
744 }
745
ntfs_readahead(struct readahead_control * rac)746 static void ntfs_readahead(struct readahead_control *rac)
747 {
748 struct address_space *mapping = rac->mapping;
749 struct inode *inode = mapping->host;
750 struct ntfs_inode *ni = ntfs_i(inode);
751 u64 valid;
752 loff_t pos;
753
754 if (is_resident(ni)) {
755 /* No readahead for resident. */
756 return;
757 }
758
759 if (is_compressed(ni)) {
760 /* No readahead for compressed. */
761 return;
762 }
763
764 valid = ni->i_valid;
765 pos = readahead_pos(rac);
766
767 if (valid < i_size_read(inode) && pos <= valid &&
768 valid < pos + readahead_length(rac)) {
769 /* Range cross 'valid'. Read it page by page. */
770 return;
771 }
772
773 mpage_readahead(rac, ntfs_get_block);
774 }
775
ntfs_get_block_direct_IO_R(struct inode * inode,sector_t iblock,struct buffer_head * bh_result,int create)776 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
777 struct buffer_head *bh_result, int create)
778 {
779 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
780 bh_result, create, GET_BLOCK_DIRECT_IO_R);
781 }
782
ntfs_get_block_direct_IO_W(struct inode * inode,sector_t iblock,struct buffer_head * bh_result,int create)783 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
784 struct buffer_head *bh_result, int create)
785 {
786 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
787 bh_result, create, GET_BLOCK_DIRECT_IO_W);
788 }
789
ntfs_direct_IO(struct kiocb * iocb,struct iov_iter * iter)790 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
791 {
792 struct file *file = iocb->ki_filp;
793 struct address_space *mapping = file->f_mapping;
794 struct inode *inode = mapping->host;
795 struct ntfs_inode *ni = ntfs_i(inode);
796 loff_t vbo = iocb->ki_pos;
797 loff_t end;
798 int wr = iov_iter_rw(iter) & WRITE;
799 size_t iter_count = iov_iter_count(iter);
800 loff_t valid;
801 ssize_t ret;
802
803 if (is_resident(ni)) {
804 /* Switch to buffered write. */
805 ret = 0;
806 goto out;
807 }
808
809 ret = blockdev_direct_IO(iocb, inode, iter,
810 wr ? ntfs_get_block_direct_IO_W :
811 ntfs_get_block_direct_IO_R);
812
813 if (ret > 0)
814 end = vbo + ret;
815 else if (wr && ret == -EIOCBQUEUED)
816 end = vbo + iter_count;
817 else
818 goto out;
819
820 valid = ni->i_valid;
821 if (wr) {
822 if (end > valid && !S_ISBLK(inode->i_mode)) {
823 ni->i_valid = end;
824 mark_inode_dirty(inode);
825 }
826 } else if (vbo < valid && valid < end) {
827 /* Fix page. */
828 iov_iter_revert(iter, end - valid);
829 iov_iter_zero(end - valid, iter);
830 }
831
832 out:
833 return ret;
834 }
835
ntfs_set_size(struct inode * inode,u64 new_size)836 int ntfs_set_size(struct inode *inode, u64 new_size)
837 {
838 struct super_block *sb = inode->i_sb;
839 struct ntfs_sb_info *sbi = sb->s_fs_info;
840 struct ntfs_inode *ni = ntfs_i(inode);
841 int err;
842
843 /* Check for maximum file size. */
844 if (is_sparsed(ni) || is_compressed(ni)) {
845 if (new_size > sbi->maxbytes_sparse) {
846 err = -EFBIG;
847 goto out;
848 }
849 } else if (new_size > sbi->maxbytes) {
850 err = -EFBIG;
851 goto out;
852 }
853
854 ni_lock(ni);
855 down_write(&ni->file.run_lock);
856
857 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
858 &ni->i_valid, true, NULL);
859
860 up_write(&ni->file.run_lock);
861 ni_unlock(ni);
862
863 mark_inode_dirty(inode);
864
865 out:
866 return err;
867 }
868
ntfs_resident_writepage(struct folio * folio,struct writeback_control * wbc,void * data)869 static int ntfs_resident_writepage(struct folio *folio,
870 struct writeback_control *wbc, void *data)
871 {
872 struct address_space *mapping = data;
873 struct inode *inode = mapping->host;
874 struct ntfs_inode *ni = ntfs_i(inode);
875 int ret;
876
877 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
878 return -EIO;
879
880 ni_lock(ni);
881 ret = attr_data_write_resident(ni, folio);
882 ni_unlock(ni);
883
884 if (ret != E_NTFS_NONRESIDENT)
885 folio_unlock(folio);
886 mapping_set_error(mapping, ret);
887 return ret;
888 }
889
ntfs_writepages(struct address_space * mapping,struct writeback_control * wbc)890 static int ntfs_writepages(struct address_space *mapping,
891 struct writeback_control *wbc)
892 {
893 struct inode *inode = mapping->host;
894
895 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
896 return -EIO;
897
898 if (is_resident(ntfs_i(inode)))
899 return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
900 mapping);
901 return mpage_writepages(mapping, wbc, ntfs_get_block);
902 }
903
ntfs_get_block_write_begin(struct inode * inode,sector_t vbn,struct buffer_head * bh_result,int create)904 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
905 struct buffer_head *bh_result, int create)
906 {
907 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
908 bh_result, create, GET_BLOCK_WRITE_BEGIN);
909 }
910
ntfs_write_begin(struct file * file,struct address_space * mapping,loff_t pos,u32 len,struct folio ** foliop,void ** fsdata)911 int ntfs_write_begin(struct file *file, struct address_space *mapping,
912 loff_t pos, u32 len, struct folio **foliop, void **fsdata)
913 {
914 int err;
915 struct inode *inode = mapping->host;
916 struct ntfs_inode *ni = ntfs_i(inode);
917
918 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
919 return -EIO;
920
921 if (is_resident(ni)) {
922 struct folio *folio = __filemap_get_folio(
923 mapping, pos >> PAGE_SHIFT, FGP_WRITEBEGIN,
924 mapping_gfp_mask(mapping));
925
926 if (IS_ERR(folio)) {
927 err = PTR_ERR(folio);
928 goto out;
929 }
930
931 ni_lock(ni);
932 err = attr_data_read_resident(ni, folio);
933 ni_unlock(ni);
934
935 if (!err) {
936 *foliop = folio;
937 goto out;
938 }
939 folio_unlock(folio);
940 folio_put(folio);
941
942 if (err != E_NTFS_NONRESIDENT)
943 goto out;
944 }
945
946 err = block_write_begin(mapping, pos, len, foliop,
947 ntfs_get_block_write_begin);
948
949 out:
950 return err;
951 }
952
953 /*
954 * ntfs_write_end - Address_space_operations::write_end.
955 */
ntfs_write_end(struct file * file,struct address_space * mapping,loff_t pos,u32 len,u32 copied,struct folio * folio,void * fsdata)956 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
957 u32 len, u32 copied, struct folio *folio, void *fsdata)
958 {
959 struct inode *inode = mapping->host;
960 struct ntfs_inode *ni = ntfs_i(inode);
961 u64 valid = ni->i_valid;
962 bool dirty = false;
963 int err;
964
965 if (is_resident(ni)) {
966 ni_lock(ni);
967 err = attr_data_write_resident(ni, folio);
968 ni_unlock(ni);
969 if (!err) {
970 struct buffer_head *head = folio_buffers(folio);
971 dirty = true;
972 /* Clear any buffers in folio. */
973 if (head) {
974 struct buffer_head *bh = head;
975
976 do {
977 clear_buffer_dirty(bh);
978 clear_buffer_mapped(bh);
979 set_buffer_uptodate(bh);
980 } while (head != (bh = bh->b_this_page));
981 }
982 folio_mark_uptodate(folio);
983 err = copied;
984 }
985 folio_unlock(folio);
986 folio_put(folio);
987 } else {
988 err = generic_write_end(file, mapping, pos, len, copied, folio,
989 fsdata);
990 }
991
992 if (err >= 0) {
993 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
994 inode_set_mtime_to_ts(inode,
995 inode_set_ctime_current(inode));
996 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
997 dirty = true;
998 }
999
1000 if (valid != ni->i_valid) {
1001 /* ni->i_valid is changed in ntfs_get_block_vbo. */
1002 dirty = true;
1003 }
1004
1005 if (pos + err > inode->i_size) {
1006 i_size_write(inode, pos + err);
1007 dirty = true;
1008 }
1009
1010 if (dirty)
1011 mark_inode_dirty(inode);
1012 }
1013
1014 return err;
1015 }
1016
ntfs3_write_inode(struct inode * inode,struct writeback_control * wbc)1017 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1018 {
1019 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1020 }
1021
ntfs_sync_inode(struct inode * inode)1022 int ntfs_sync_inode(struct inode *inode)
1023 {
1024 return _ni_write_inode(inode, 1);
1025 }
1026
1027 /*
1028 * Helper function to read file.
1029 */
inode_read_data(struct inode * inode,void * data,size_t bytes)1030 int inode_read_data(struct inode *inode, void *data, size_t bytes)
1031 {
1032 pgoff_t idx;
1033 struct address_space *mapping = inode->i_mapping;
1034
1035 for (idx = 0; bytes; idx++) {
1036 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1037 struct page *page = read_mapping_page(mapping, idx, NULL);
1038 void *kaddr;
1039
1040 if (IS_ERR(page))
1041 return PTR_ERR(page);
1042
1043 kaddr = kmap_atomic(page);
1044 memcpy(data, kaddr, op);
1045 kunmap_atomic(kaddr);
1046
1047 put_page(page);
1048
1049 bytes -= op;
1050 data = Add2Ptr(data, PAGE_SIZE);
1051 }
1052 return 0;
1053 }
1054
1055 /*
1056 * ntfs_reparse_bytes
1057 *
1058 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1059 * for unicode string of @uni_len length.
1060 */
ntfs_reparse_bytes(u32 uni_len)1061 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1062 {
1063 /* Header + unicode string + decorated unicode string. */
1064 return sizeof(short) * (2 * uni_len + 4) +
1065 offsetof(struct REPARSE_DATA_BUFFER,
1066 SymbolicLinkReparseBuffer.PathBuffer);
1067 }
1068
1069 static struct REPARSE_DATA_BUFFER *
ntfs_create_reparse_buffer(struct ntfs_sb_info * sbi,const char * symname,u32 size,u16 * nsize)1070 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1071 u32 size, u16 *nsize)
1072 {
1073 int i, err;
1074 struct REPARSE_DATA_BUFFER *rp;
1075 __le16 *rp_name;
1076 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1077
1078 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1079 if (!rp)
1080 return ERR_PTR(-ENOMEM);
1081
1082 rs = &rp->SymbolicLinkReparseBuffer;
1083 rp_name = rs->PathBuffer;
1084
1085 /* Convert link name to UTF-16. */
1086 err = ntfs_nls_to_utf16(sbi, symname, size,
1087 (struct cpu_str *)(rp_name - 1), 2 * size,
1088 UTF16_LITTLE_ENDIAN);
1089 if (err < 0)
1090 goto out;
1091
1092 /* err = the length of unicode name of symlink. */
1093 *nsize = ntfs_reparse_bytes(err);
1094
1095 if (*nsize > sbi->reparse.max_size) {
1096 err = -EFBIG;
1097 goto out;
1098 }
1099
1100 /* Translate Linux '/' into Windows '\'. */
1101 for (i = 0; i < err; i++) {
1102 if (rp_name[i] == cpu_to_le16('/'))
1103 rp_name[i] = cpu_to_le16('\\');
1104 }
1105
1106 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1107 rp->ReparseDataLength =
1108 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1109 SymbolicLinkReparseBuffer));
1110
1111 /* PrintName + SubstituteName. */
1112 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1113 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1114 rs->PrintNameLength = rs->SubstituteNameOffset;
1115
1116 /*
1117 * TODO: Use relative path if possible to allow Windows to
1118 * parse this path.
1119 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1120 */
1121 rs->Flags = 0;
1122
1123 memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1124
1125 /* Decorate SubstituteName. */
1126 rp_name += err;
1127 rp_name[0] = cpu_to_le16('\\');
1128 rp_name[1] = cpu_to_le16('?');
1129 rp_name[2] = cpu_to_le16('?');
1130 rp_name[3] = cpu_to_le16('\\');
1131
1132 return rp;
1133 out:
1134 kfree(rp);
1135 return ERR_PTR(err);
1136 }
1137
1138 /*
1139 * ntfs_create_inode
1140 *
1141 * Helper function for:
1142 * - ntfs_create
1143 * - ntfs_mknod
1144 * - ntfs_symlink
1145 * - ntfs_mkdir
1146 * - ntfs_atomic_open
1147 *
1148 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1149 */
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)1150 int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1151 struct dentry *dentry, const struct cpu_str *uni,
1152 umode_t mode, dev_t dev, const char *symname, u32 size,
1153 struct ntfs_fnd *fnd)
1154 {
1155 int err;
1156 struct super_block *sb = dir->i_sb;
1157 struct ntfs_sb_info *sbi = sb->s_fs_info;
1158 const struct qstr *name = &dentry->d_name;
1159 CLST ino = 0;
1160 struct ntfs_inode *dir_ni = ntfs_i(dir);
1161 struct ntfs_inode *ni = NULL;
1162 struct inode *inode = NULL;
1163 struct ATTRIB *attr;
1164 struct ATTR_STD_INFO5 *std5;
1165 struct ATTR_FILE_NAME *fname;
1166 struct MFT_REC *rec;
1167 u32 asize, dsize, sd_size;
1168 enum FILE_ATTRIBUTE fa;
1169 __le32 security_id = SECURITY_ID_INVALID;
1170 CLST vcn;
1171 const void *sd;
1172 u16 t16, nsize = 0, aid = 0;
1173 struct INDEX_ROOT *root, *dir_root;
1174 struct NTFS_DE *e, *new_de = NULL;
1175 struct REPARSE_DATA_BUFFER *rp = NULL;
1176 bool rp_inserted = false;
1177
1178 /* New file will be resident or non resident. */
1179 const bool new_file_resident = 1;
1180
1181 if (!fnd)
1182 ni_lock_dir(dir_ni);
1183
1184 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1185 if (!dir_root) {
1186 err = -EINVAL;
1187 goto out1;
1188 }
1189
1190 if (S_ISDIR(mode)) {
1191 /* Use parent's directory attributes. */
1192 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1193 FILE_ATTRIBUTE_ARCHIVE;
1194 /*
1195 * By default child directory inherits parent attributes.
1196 * Root directory is hidden + system.
1197 * Make an exception for children in root.
1198 */
1199 if (dir->i_ino == MFT_REC_ROOT)
1200 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1201 } else if (S_ISLNK(mode)) {
1202 /* It is good idea that link should be the same type (file/dir) as target */
1203 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1204
1205 /*
1206 * Linux: there are dir/file/symlink and so on.
1207 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1208 * It is good idea to create:
1209 * dir + reparse if 'symname' points to directory
1210 * or
1211 * file + reparse if 'symname' points to file
1212 * Unfortunately kern_path hangs if symname contains 'dir'.
1213 */
1214
1215 /*
1216 * struct path path;
1217 *
1218 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1219 * struct inode *target = d_inode(path.dentry);
1220 *
1221 * if (S_ISDIR(target->i_mode))
1222 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1223 * // if ( target->i_sb == sb ){
1224 * // use relative path?
1225 * // }
1226 * path_put(&path);
1227 * }
1228 */
1229 } else if (S_ISREG(mode)) {
1230 if (sbi->options->sparse) {
1231 /* Sparsed regular file, cause option 'sparse'. */
1232 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1233 FILE_ATTRIBUTE_ARCHIVE;
1234 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1235 /* Compressed regular file, if parent is compressed. */
1236 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1237 } else {
1238 /* Regular file, default attributes. */
1239 fa = FILE_ATTRIBUTE_ARCHIVE;
1240 }
1241 } else {
1242 fa = FILE_ATTRIBUTE_ARCHIVE;
1243 }
1244
1245 /* If option "hide_dot_files" then set hidden attribute for dot files. */
1246 if (sbi->options->hide_dot_files && name->name[0] == '.')
1247 fa |= FILE_ATTRIBUTE_HIDDEN;
1248
1249 if (!(mode & 0222))
1250 fa |= FILE_ATTRIBUTE_READONLY;
1251
1252 /* Allocate PATH_MAX bytes. */
1253 new_de = __getname();
1254 if (!new_de) {
1255 err = -ENOMEM;
1256 goto out1;
1257 }
1258
1259 if (unlikely(ntfs3_forced_shutdown(sb))) {
1260 err = -EIO;
1261 goto out2;
1262 }
1263
1264 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1265 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1266
1267 /* Step 1: allocate and fill new mft record. */
1268 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1269 if (err)
1270 goto out2;
1271
1272 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1273 if (IS_ERR(ni)) {
1274 err = PTR_ERR(ni);
1275 ni = NULL;
1276 goto out3;
1277 }
1278 inode = &ni->vfs_inode;
1279 inode_init_owner(idmap, inode, dir, mode);
1280 mode = inode->i_mode;
1281
1282 ni->i_crtime = current_time(inode);
1283
1284 rec = ni->mi.mrec;
1285 rec->hard_links = cpu_to_le16(1);
1286 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1287
1288 /* Get default security id. */
1289 sd = s_default_security;
1290 sd_size = sizeof(s_default_security);
1291
1292 if (is_ntfs3(sbi)) {
1293 security_id = dir_ni->std_security_id;
1294 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1295 security_id = sbi->security.def_security_id;
1296
1297 if (security_id == SECURITY_ID_INVALID &&
1298 !ntfs_insert_security(sbi, sd, sd_size,
1299 &security_id, NULL))
1300 sbi->security.def_security_id = security_id;
1301 }
1302 }
1303
1304 /* Insert standard info. */
1305 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1306
1307 if (security_id == SECURITY_ID_INVALID) {
1308 dsize = sizeof(struct ATTR_STD_INFO);
1309 } else {
1310 dsize = sizeof(struct ATTR_STD_INFO5);
1311 std5->security_id = security_id;
1312 ni->std_security_id = security_id;
1313 }
1314 asize = SIZEOF_RESIDENT + dsize;
1315
1316 attr->type = ATTR_STD;
1317 attr->size = cpu_to_le32(asize);
1318 attr->id = cpu_to_le16(aid++);
1319 attr->res.data_off = SIZEOF_RESIDENT_LE;
1320 attr->res.data_size = cpu_to_le32(dsize);
1321
1322 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1323 kernel2nt(&ni->i_crtime);
1324
1325 std5->fa = ni->std_fa = fa;
1326
1327 attr = Add2Ptr(attr, asize);
1328
1329 /* Insert file name. */
1330 err = fill_name_de(sbi, new_de, name, uni);
1331 if (err)
1332 goto out4;
1333
1334 mi_get_ref(&ni->mi, &new_de->ref);
1335
1336 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1337
1338 if (sbi->options->windows_names &&
1339 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1340 err = -EINVAL;
1341 goto out4;
1342 }
1343
1344 mi_get_ref(&dir_ni->mi, &fname->home);
1345 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1346 fname->dup.a_time = std5->cr_time;
1347 fname->dup.alloc_size = fname->dup.data_size = 0;
1348 fname->dup.fa = std5->fa;
1349 fname->dup.ea_size = fname->dup.reparse = 0;
1350
1351 dsize = le16_to_cpu(new_de->key_size);
1352 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1353
1354 attr->type = ATTR_NAME;
1355 attr->size = cpu_to_le32(asize);
1356 attr->res.data_off = SIZEOF_RESIDENT_LE;
1357 attr->res.flags = RESIDENT_FLAG_INDEXED;
1358 attr->id = cpu_to_le16(aid++);
1359 attr->res.data_size = cpu_to_le32(dsize);
1360 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1361
1362 attr = Add2Ptr(attr, asize);
1363
1364 if (security_id == SECURITY_ID_INVALID) {
1365 /* Insert security attribute. */
1366 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1367
1368 attr->type = ATTR_SECURE;
1369 attr->size = cpu_to_le32(asize);
1370 attr->id = cpu_to_le16(aid++);
1371 attr->res.data_off = SIZEOF_RESIDENT_LE;
1372 attr->res.data_size = cpu_to_le32(sd_size);
1373 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1374
1375 attr = Add2Ptr(attr, asize);
1376 }
1377
1378 attr->id = cpu_to_le16(aid++);
1379 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1380 /*
1381 * Regular directory or symlink to directory.
1382 * Create root attribute.
1383 */
1384 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1385 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1386
1387 attr->type = ATTR_ROOT;
1388 attr->size = cpu_to_le32(asize);
1389
1390 attr->name_len = ARRAY_SIZE(I30_NAME);
1391 attr->name_off = SIZEOF_RESIDENT_LE;
1392 attr->res.data_off =
1393 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1394 attr->res.data_size = cpu_to_le32(dsize);
1395 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1396 sizeof(I30_NAME));
1397
1398 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1399 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1400 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1401 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1402 sizeof(struct NTFS_DE));
1403 root->ihdr.total = root->ihdr.used;
1404
1405 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1406 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1407 e->flags = NTFS_IE_LAST;
1408 } else if (S_ISLNK(mode)) {
1409 /*
1410 * Symlink to file.
1411 * Create empty resident data attribute.
1412 */
1413 asize = SIZEOF_RESIDENT;
1414
1415 /* Insert empty ATTR_DATA */
1416 attr->type = ATTR_DATA;
1417 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1418 attr->name_off = SIZEOF_RESIDENT_LE;
1419 attr->res.data_off = SIZEOF_RESIDENT_LE;
1420 } else if (!new_file_resident && S_ISREG(mode)) {
1421 /*
1422 * Regular file. Create empty non resident data attribute.
1423 */
1424 attr->type = ATTR_DATA;
1425 attr->non_res = 1;
1426 attr->nres.evcn = cpu_to_le64(-1ll);
1427 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1428 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1429 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1430 attr->flags = ATTR_FLAG_SPARSED;
1431 asize = SIZEOF_NONRESIDENT_EX + 8;
1432 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1433 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1434 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1435 attr->flags = ATTR_FLAG_COMPRESSED;
1436 attr->nres.c_unit = NTFS_LZNT_CUNIT;
1437 asize = SIZEOF_NONRESIDENT_EX + 8;
1438 } else {
1439 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1440 attr->name_off = SIZEOF_NONRESIDENT_LE;
1441 asize = SIZEOF_NONRESIDENT + 8;
1442 }
1443 attr->nres.run_off = attr->name_off;
1444 } else {
1445 /*
1446 * Node. Create empty resident data attribute.
1447 */
1448 attr->type = ATTR_DATA;
1449 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1450 attr->name_off = SIZEOF_RESIDENT_LE;
1451 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1452 attr->flags = ATTR_FLAG_SPARSED;
1453 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1454 attr->flags = ATTR_FLAG_COMPRESSED;
1455 attr->res.data_off = SIZEOF_RESIDENT_LE;
1456 asize = SIZEOF_RESIDENT;
1457 ni->ni_flags |= NI_FLAG_RESIDENT;
1458 }
1459
1460 if (S_ISDIR(mode)) {
1461 ni->ni_flags |= NI_FLAG_DIR;
1462 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1463 if (err)
1464 goto out4;
1465 } else if (S_ISLNK(mode)) {
1466 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1467
1468 if (IS_ERR(rp)) {
1469 err = PTR_ERR(rp);
1470 rp = NULL;
1471 goto out4;
1472 }
1473
1474 /*
1475 * Insert ATTR_REPARSE.
1476 */
1477 attr = Add2Ptr(attr, asize);
1478 attr->type = ATTR_REPARSE;
1479 attr->id = cpu_to_le16(aid++);
1480
1481 /* Resident or non resident? */
1482 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1483 t16 = PtrOffset(rec, attr);
1484
1485 /*
1486 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1487 * It is good idea to keep extended attributes resident.
1488 */
1489 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1490 CLST alen;
1491 CLST clst = bytes_to_cluster(sbi, nsize);
1492
1493 /* Bytes per runs. */
1494 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1495
1496 attr->non_res = 1;
1497 attr->nres.evcn = cpu_to_le64(clst - 1);
1498 attr->name_off = SIZEOF_NONRESIDENT_LE;
1499 attr->nres.run_off = attr->name_off;
1500 attr->nres.data_size = cpu_to_le64(nsize);
1501 attr->nres.valid_size = attr->nres.data_size;
1502 attr->nres.alloc_size =
1503 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1504
1505 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1506 clst, NULL, ALLOCATE_DEF,
1507 &alen, 0, NULL, NULL);
1508 if (err)
1509 goto out5;
1510
1511 err = run_pack(&ni->file.run, 0, clst,
1512 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1513 &vcn);
1514 if (err < 0)
1515 goto out5;
1516
1517 if (vcn != clst) {
1518 err = -EINVAL;
1519 goto out5;
1520 }
1521
1522 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1523 /* Write non resident data. */
1524 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1525 nsize, 0);
1526 if (err)
1527 goto out5;
1528 } else {
1529 attr->res.data_off = SIZEOF_RESIDENT_LE;
1530 attr->res.data_size = cpu_to_le32(nsize);
1531 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1532 }
1533 /* Size of symlink equals the length of input string. */
1534 inode->i_size = size;
1535
1536 attr->size = cpu_to_le32(asize);
1537
1538 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1539 &new_de->ref);
1540 if (err)
1541 goto out5;
1542
1543 rp_inserted = true;
1544 }
1545
1546 attr = Add2Ptr(attr, asize);
1547 attr->type = ATTR_END;
1548
1549 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1550 rec->next_attr_id = cpu_to_le16(aid);
1551
1552 inode->i_generation = le16_to_cpu(rec->seq);
1553
1554 if (S_ISDIR(mode)) {
1555 inode->i_op = &ntfs_dir_inode_operations;
1556 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1557 &ntfs_legacy_dir_operations :
1558 &ntfs_dir_operations;
1559 } else if (S_ISLNK(mode)) {
1560 inode->i_op = &ntfs_link_inode_operations;
1561 inode->i_fop = NULL;
1562 inode->i_mapping->a_ops = &ntfs_aops;
1563 inode->i_size = size;
1564 inode_nohighmem(inode);
1565 } else if (S_ISREG(mode)) {
1566 inode->i_op = &ntfs_file_inode_operations;
1567 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1568 &ntfs_legacy_file_operations :
1569 &ntfs_file_operations;
1570 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1571 &ntfs_aops;
1572 init_rwsem(&ni->file.run_lock);
1573 } else {
1574 inode->i_op = &ntfs_special_inode_operations;
1575 init_special_inode(inode, mode, dev);
1576 }
1577
1578 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1579 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1580 err = ntfs_init_acl(idmap, inode, dir);
1581 if (err)
1582 goto out5;
1583 } else
1584 #endif
1585 {
1586 inode->i_flags |= S_NOSEC;
1587 }
1588
1589 /*
1590 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1591 * The packed size of extended attribute is stored in direntry too.
1592 * 'fname' here points to inside new_de.
1593 */
1594 err = ntfs_save_wsl_perm(inode, &fname->dup.ea_size);
1595 if (err)
1596 goto out6;
1597
1598 /*
1599 * update ea_size in file_name attribute too.
1600 * Use ni_find_attr cause layout of MFT record may be changed
1601 * in ntfs_init_acl and ntfs_save_wsl_perm.
1602 */
1603 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
1604 if (attr) {
1605 struct ATTR_FILE_NAME *fn;
1606
1607 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1608 if (fn)
1609 fn->dup.ea_size = fname->dup.ea_size;
1610 }
1611
1612 /* We do not need to update parent directory later */
1613 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1614
1615 /* Step 2: Add new name in index. */
1616 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1617 if (err)
1618 goto out6;
1619
1620 /*
1621 * Call 'd_instantiate' after inode->i_op is set
1622 * but before finish_open.
1623 */
1624 d_instantiate(dentry, inode);
1625
1626 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1627 inode_set_atime_to_ts(inode, ni->i_crtime);
1628 inode_set_ctime_to_ts(inode, ni->i_crtime);
1629 inode_set_mtime_to_ts(inode, ni->i_crtime);
1630 inode_set_mtime_to_ts(dir, ni->i_crtime);
1631 inode_set_ctime_to_ts(dir, ni->i_crtime);
1632
1633 mark_inode_dirty(dir);
1634 mark_inode_dirty(inode);
1635
1636 /* Normal exit. */
1637 goto out2;
1638
1639 out6:
1640 attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL);
1641 if (attr && attr->non_res) {
1642 /* Delete ATTR_EA, if non-resident. */
1643 struct runs_tree run;
1644 run_init(&run);
1645 attr_set_size(ni, ATTR_EA, NULL, 0, &run, 0, NULL, false, NULL);
1646 run_close(&run);
1647 }
1648
1649 if (rp_inserted)
1650 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1651
1652 out5:
1653 if (!S_ISDIR(mode))
1654 run_deallocate(sbi, &ni->file.run, false);
1655
1656 out4:
1657 clear_rec_inuse(rec);
1658 clear_nlink(inode);
1659 ni->mi.dirty = false;
1660 discard_new_inode(inode);
1661 out3:
1662 ntfs_mark_rec_free(sbi, ino, false);
1663
1664 out2:
1665 __putname(new_de);
1666 kfree(rp);
1667
1668 out1:
1669 if (!fnd)
1670 ni_unlock(dir_ni);
1671
1672 if (!err)
1673 unlock_new_inode(inode);
1674
1675 return err;
1676 }
1677
ntfs_link_inode(struct inode * inode,struct dentry * dentry)1678 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1679 {
1680 int err;
1681 struct ntfs_inode *ni = ntfs_i(inode);
1682 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1683 struct NTFS_DE *de;
1684
1685 /* Allocate PATH_MAX bytes. */
1686 de = __getname();
1687 if (!de)
1688 return -ENOMEM;
1689
1690 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1691 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1692
1693 /* Construct 'de'. */
1694 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1695 if (err)
1696 goto out;
1697
1698 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1699 out:
1700 __putname(de);
1701 return err;
1702 }
1703
1704 /*
1705 * ntfs_unlink_inode
1706 *
1707 * inode_operations::unlink
1708 * inode_operations::rmdir
1709 */
ntfs_unlink_inode(struct inode * dir,const struct dentry * dentry)1710 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1711 {
1712 int err;
1713 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1714 struct inode *inode = d_inode(dentry);
1715 struct ntfs_inode *ni = ntfs_i(inode);
1716 struct ntfs_inode *dir_ni = ntfs_i(dir);
1717 struct NTFS_DE *de, *de2 = NULL;
1718 int undo_remove;
1719
1720 if (ntfs_is_meta_file(sbi, ni->mi.rno))
1721 return -EINVAL;
1722
1723 /* Allocate PATH_MAX bytes. */
1724 de = __getname();
1725 if (!de)
1726 return -ENOMEM;
1727
1728 ni_lock(ni);
1729
1730 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1731 err = -ENOTEMPTY;
1732 goto out;
1733 }
1734
1735 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1736 if (err < 0)
1737 goto out;
1738
1739 undo_remove = 0;
1740 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1741
1742 if (!err) {
1743 drop_nlink(inode);
1744 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1745 mark_inode_dirty(dir);
1746 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1747 if (inode->i_nlink)
1748 mark_inode_dirty(inode);
1749 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1750 _ntfs_bad_inode(inode);
1751 } else {
1752 if (ni_is_dirty(dir))
1753 mark_inode_dirty(dir);
1754 if (ni_is_dirty(inode))
1755 mark_inode_dirty(inode);
1756 }
1757
1758 out:
1759 ni_unlock(ni);
1760 __putname(de);
1761 return err;
1762 }
1763
ntfs_evict_inode(struct inode * inode)1764 void ntfs_evict_inode(struct inode *inode)
1765 {
1766 truncate_inode_pages_final(&inode->i_data);
1767
1768 invalidate_inode_buffers(inode);
1769 clear_inode(inode);
1770
1771 ni_clear(ntfs_i(inode));
1772 }
1773
1774 /*
1775 * ntfs_translate_junction
1776 *
1777 * Translate a Windows junction target to the Linux equivalent.
1778 * On junctions, targets are always absolute (they include the drive
1779 * letter). We have no way of knowing if the target is for the current
1780 * mounted device or not so we just assume it is.
1781 */
ntfs_translate_junction(const struct super_block * sb,const struct dentry * link_de,char * target,int target_len,int target_max)1782 static int ntfs_translate_junction(const struct super_block *sb,
1783 const struct dentry *link_de, char *target,
1784 int target_len, int target_max)
1785 {
1786 int tl_len, err = target_len;
1787 char *link_path_buffer = NULL, *link_path;
1788 char *translated = NULL;
1789 char *target_start;
1790 int copy_len;
1791
1792 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1793 if (!link_path_buffer) {
1794 err = -ENOMEM;
1795 goto out;
1796 }
1797 /* Get link path, relative to mount point */
1798 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1799 if (IS_ERR(link_path)) {
1800 ntfs_err(sb, "Error getting link path");
1801 err = -EINVAL;
1802 goto out;
1803 }
1804
1805 translated = kmalloc(PATH_MAX, GFP_NOFS);
1806 if (!translated) {
1807 err = -ENOMEM;
1808 goto out;
1809 }
1810
1811 /* Make translated path a relative path to mount point */
1812 strcpy(translated, "./");
1813 ++link_path; /* Skip leading / */
1814 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1815 if (*link_path == '/') {
1816 if (PATH_MAX - tl_len < sizeof("../")) {
1817 ntfs_err(sb,
1818 "Link path %s has too many components",
1819 link_path);
1820 err = -EINVAL;
1821 goto out;
1822 }
1823 strcpy(translated + tl_len, "../");
1824 tl_len += sizeof("../") - 1;
1825 }
1826 }
1827
1828 /* Skip drive letter */
1829 target_start = target;
1830 while (*target_start && *target_start != ':')
1831 ++target_start;
1832
1833 if (!*target_start) {
1834 ntfs_err(sb, "Link target (%s) missing drive separator",
1835 target);
1836 err = -EINVAL;
1837 goto out;
1838 }
1839
1840 /* Skip drive separator and leading /, if exists */
1841 target_start += 1 + (target_start[1] == '/');
1842 copy_len = target_len - (target_start - target);
1843
1844 if (PATH_MAX - tl_len <= copy_len) {
1845 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1846 target_start, PATH_MAX - tl_len, copy_len);
1847 err = -EINVAL;
1848 goto out;
1849 }
1850
1851 /* translated path has a trailing / and target_start does not */
1852 strcpy(translated + tl_len, target_start);
1853 tl_len += copy_len;
1854 if (target_max <= tl_len) {
1855 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1856 translated, target_max, tl_len);
1857 err = -EINVAL;
1858 goto out;
1859 }
1860 strcpy(target, translated);
1861 err = tl_len;
1862
1863 out:
1864 kfree(link_path_buffer);
1865 kfree(translated);
1866 return err;
1867 }
1868
ntfs_readlink_hlp(const struct dentry * link_de,struct inode * inode,char * buffer,int buflen)1869 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1870 struct inode *inode, char *buffer,
1871 int buflen)
1872 {
1873 int i, err = -EINVAL;
1874 struct ntfs_inode *ni = ntfs_i(inode);
1875 struct super_block *sb = inode->i_sb;
1876 struct ntfs_sb_info *sbi = sb->s_fs_info;
1877 u64 size;
1878 u16 ulen = 0;
1879 void *to_free = NULL;
1880 struct REPARSE_DATA_BUFFER *rp;
1881 const __le16 *uname;
1882 struct ATTRIB *attr;
1883
1884 /* Reparse data present. Try to parse it. */
1885 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1886 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1887
1888 *buffer = 0;
1889
1890 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1891 if (!attr)
1892 goto out;
1893
1894 if (!attr->non_res) {
1895 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1896 if (!rp)
1897 goto out;
1898 size = le32_to_cpu(attr->res.data_size);
1899 } else {
1900 size = le64_to_cpu(attr->nres.data_size);
1901 rp = NULL;
1902 }
1903
1904 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1905 goto out;
1906
1907 if (!rp) {
1908 rp = kmalloc(size, GFP_NOFS);
1909 if (!rp) {
1910 err = -ENOMEM;
1911 goto out;
1912 }
1913 to_free = rp;
1914 /* Read into temporal buffer. */
1915 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1916 if (err)
1917 goto out;
1918 }
1919
1920 /* Microsoft Tag. */
1921 switch (rp->ReparseTag) {
1922 case IO_REPARSE_TAG_MOUNT_POINT:
1923 /* Mount points and junctions. */
1924 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1925 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1926 MountPointReparseBuffer.PathBuffer))
1927 goto out;
1928 uname = Add2Ptr(rp,
1929 offsetof(struct REPARSE_DATA_BUFFER,
1930 MountPointReparseBuffer.PathBuffer) +
1931 le16_to_cpu(rp->MountPointReparseBuffer
1932 .PrintNameOffset));
1933 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1934 break;
1935
1936 case IO_REPARSE_TAG_SYMLINK:
1937 /* FolderSymbolicLink */
1938 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1939 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1940 SymbolicLinkReparseBuffer.PathBuffer))
1941 goto out;
1942 uname = Add2Ptr(
1943 rp, offsetof(struct REPARSE_DATA_BUFFER,
1944 SymbolicLinkReparseBuffer.PathBuffer) +
1945 le16_to_cpu(rp->SymbolicLinkReparseBuffer
1946 .PrintNameOffset));
1947 ulen = le16_to_cpu(
1948 rp->SymbolicLinkReparseBuffer.PrintNameLength);
1949 break;
1950
1951 case IO_REPARSE_TAG_CLOUD:
1952 case IO_REPARSE_TAG_CLOUD_1:
1953 case IO_REPARSE_TAG_CLOUD_2:
1954 case IO_REPARSE_TAG_CLOUD_3:
1955 case IO_REPARSE_TAG_CLOUD_4:
1956 case IO_REPARSE_TAG_CLOUD_5:
1957 case IO_REPARSE_TAG_CLOUD_6:
1958 case IO_REPARSE_TAG_CLOUD_7:
1959 case IO_REPARSE_TAG_CLOUD_8:
1960 case IO_REPARSE_TAG_CLOUD_9:
1961 case IO_REPARSE_TAG_CLOUD_A:
1962 case IO_REPARSE_TAG_CLOUD_B:
1963 case IO_REPARSE_TAG_CLOUD_C:
1964 case IO_REPARSE_TAG_CLOUD_D:
1965 case IO_REPARSE_TAG_CLOUD_E:
1966 case IO_REPARSE_TAG_CLOUD_F:
1967 err = sizeof("OneDrive") - 1;
1968 if (err > buflen)
1969 err = buflen;
1970 memcpy(buffer, "OneDrive", err);
1971 goto out;
1972
1973 default:
1974 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
1975 /* Unknown Microsoft Tag. */
1976 goto out;
1977 }
1978 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
1979 size <= sizeof(struct REPARSE_POINT)) {
1980 goto out;
1981 }
1982
1983 /* Users tag. */
1984 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
1985 ulen = le16_to_cpu(rp->ReparseDataLength) -
1986 sizeof(struct REPARSE_POINT);
1987 }
1988
1989 /* Convert nlen from bytes to UNICODE chars. */
1990 ulen >>= 1;
1991
1992 /* Check that name is available. */
1993 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
1994 goto out;
1995
1996 /* If name is already zero terminated then truncate it now. */
1997 if (!uname[ulen - 1])
1998 ulen -= 1;
1999
2000 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2001
2002 if (err < 0)
2003 goto out;
2004
2005 /* Translate Windows '\' into Linux '/'. */
2006 for (i = 0; i < err; i++) {
2007 if (buffer[i] == '\\')
2008 buffer[i] = '/';
2009 }
2010
2011 /* Always set last zero. */
2012 buffer[err] = 0;
2013
2014 /* If this is a junction, translate the link target. */
2015 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2016 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2017
2018 out:
2019 kfree(to_free);
2020 return err;
2021 }
2022
ntfs_get_link(struct dentry * de,struct inode * inode,struct delayed_call * done)2023 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2024 struct delayed_call *done)
2025 {
2026 int err;
2027 char *ret;
2028
2029 if (!de)
2030 return ERR_PTR(-ECHILD);
2031
2032 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2033 if (!ret)
2034 return ERR_PTR(-ENOMEM);
2035
2036 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2037 if (err < 0) {
2038 kfree(ret);
2039 return ERR_PTR(err);
2040 }
2041
2042 set_delayed_call(done, kfree_link, ret);
2043
2044 return ret;
2045 }
2046
2047 // clang-format off
2048 const struct inode_operations ntfs_link_inode_operations = {
2049 .get_link = ntfs_get_link,
2050 .setattr = ntfs_setattr,
2051 .listxattr = ntfs_listxattr,
2052 };
2053
2054 const struct address_space_operations ntfs_aops = {
2055 .read_folio = ntfs_read_folio,
2056 .readahead = ntfs_readahead,
2057 .writepages = ntfs_writepages,
2058 .write_begin = ntfs_write_begin,
2059 .write_end = ntfs_write_end,
2060 .direct_IO = ntfs_direct_IO,
2061 .bmap = ntfs_bmap,
2062 .dirty_folio = block_dirty_folio,
2063 .migrate_folio = buffer_migrate_folio,
2064 .invalidate_folio = block_invalidate_folio,
2065 };
2066
2067 const struct address_space_operations ntfs_aops_cmpr = {
2068 .read_folio = ntfs_read_folio,
2069 .readahead = ntfs_readahead,
2070 .dirty_folio = block_dirty_folio,
2071 };
2072 // clang-format on
2073