1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 *
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
5 *
6 */
7
8 #include <linux/buffer_head.h>
9 #include <linux/fs.h>
10 #include <linux/mpage.h>
11 #include <linux/namei.h>
12 #include <linux/nls.h>
13 #include <linux/uio.h>
14 #include <linux/writeback.h>
15
16 #include "debug.h"
17 #include "ntfs.h"
18 #include "ntfs_fs.h"
19
20 /*
21 * ntfs_read_mft - Read record and parses MFT.
22 */
ntfs_read_mft(struct inode * inode,const struct cpu_str * name,const struct MFT_REF * ref)23 static struct inode *ntfs_read_mft(struct inode *inode,
24 const struct cpu_str *name,
25 const struct MFT_REF *ref)
26 {
27 int err = 0;
28 struct ntfs_inode *ni = ntfs_i(inode);
29 struct super_block *sb = inode->i_sb;
30 struct ntfs_sb_info *sbi = sb->s_fs_info;
31 mode_t mode = 0;
32 struct ATTR_STD_INFO5 *std5 = NULL;
33 struct ATTR_LIST_ENTRY *le;
34 struct ATTRIB *attr;
35 bool is_match = false;
36 bool is_root = false;
37 bool is_dir;
38 unsigned long ino = inode->i_ino;
39 u32 rp_fa = 0, asize, t32;
40 u16 roff, rsize, names = 0, links = 0;
41 const struct ATTR_FILE_NAME *fname = NULL;
42 const struct INDEX_ROOT *root;
43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
44 u64 t64;
45 struct MFT_REC *rec;
46 struct runs_tree *run;
47 struct timespec64 ctime;
48
49 inode->i_op = NULL;
50 /* Setup 'uid' and 'gid' */
51 inode->i_uid = sbi->options->fs_uid;
52 inode->i_gid = sbi->options->fs_gid;
53
54 err = mi_init(&ni->mi, sbi, ino);
55 if (err)
56 goto out;
57
58 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
59 t64 = sbi->mft.lbo >> sbi->cluster_bits;
60 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
61 sbi->mft.ni = ni;
62 init_rwsem(&ni->file.run_lock);
63
64 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
65 err = -ENOMEM;
66 goto out;
67 }
68 }
69
70 err = mi_read(&ni->mi, ino == MFT_REC_MFT);
71
72 if (err)
73 goto out;
74
75 rec = ni->mi.mrec;
76
77 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
78 ;
79 } else if (ref->seq != rec->seq) {
80 err = -EINVAL;
81 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
82 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
83 goto out;
84 } else if (!is_rec_inuse(rec)) {
85 err = -ESTALE;
86 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
87 goto out;
88 }
89
90 if (le32_to_cpu(rec->total) != sbi->record_size) {
91 /* Bad inode? */
92 err = -EINVAL;
93 goto out;
94 }
95
96 if (!is_rec_base(rec)) {
97 err = -EINVAL;
98 goto out;
99 }
100
101 /* Record should contain $I30 root. */
102 is_dir = rec->flags & RECORD_FLAG_DIR;
103
104 /* MFT_REC_MFT is not a dir */
105 if (is_dir && ino == MFT_REC_MFT) {
106 err = -EINVAL;
107 goto out;
108 }
109
110 inode->i_generation = le16_to_cpu(rec->seq);
111
112 /* Enumerate all struct Attributes MFT. */
113 le = NULL;
114 attr = NULL;
115
116 /*
117 * To reduce tab pressure use goto instead of
118 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
119 */
120 next_attr:
121 run = NULL;
122 err = -EINVAL;
123 attr = ni_enum_attr_ex(ni, attr, &le, NULL);
124 if (!attr)
125 goto end_enum;
126
127 if (le && le->vcn) {
128 /* This is non primary attribute segment. Ignore if not MFT. */
129 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
130 goto next_attr;
131
132 run = &ni->file.run;
133 asize = le32_to_cpu(attr->size);
134 goto attr_unpack_run;
135 }
136
137 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
138 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
139 asize = le32_to_cpu(attr->size);
140
141 /*
142 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'.
143 * There not critical to check this case again
144 */
145 if (attr->name_len &&
146 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) >
147 asize)
148 goto out;
149
150 if (attr->non_res) {
151 t64 = le64_to_cpu(attr->nres.alloc_size);
152 if (le64_to_cpu(attr->nres.data_size) > t64 ||
153 le64_to_cpu(attr->nres.valid_size) > t64)
154 goto out;
155 }
156
157 switch (attr->type) {
158 case ATTR_STD:
159 if (attr->non_res ||
160 asize < sizeof(struct ATTR_STD_INFO) + roff ||
161 rsize < sizeof(struct ATTR_STD_INFO))
162 goto out;
163
164 if (std5)
165 goto next_attr;
166
167 std5 = Add2Ptr(attr, roff);
168
169 #ifdef STATX_BTIME
170 nt2kernel(std5->cr_time, &ni->i_crtime);
171 #endif
172 nt2kernel(std5->a_time, &inode->i_atime);
173 nt2kernel(std5->c_time, &ctime);
174 inode_set_ctime_to_ts(inode, ctime);
175 nt2kernel(std5->m_time, &inode->i_mtime);
176
177 ni->std_fa = std5->fa;
178
179 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
180 rsize >= sizeof(struct ATTR_STD_INFO5))
181 ni->std_security_id = std5->security_id;
182 goto next_attr;
183
184 case ATTR_LIST:
185 if (attr->name_len || le || ino == MFT_REC_LOG)
186 goto out;
187
188 err = ntfs_load_attr_list(ni, attr);
189 if (err)
190 goto out;
191
192 le = NULL;
193 attr = NULL;
194 goto next_attr;
195
196 case ATTR_NAME:
197 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
198 rsize < SIZEOF_ATTRIBUTE_FILENAME)
199 goto out;
200
201 names += 1;
202 fname = Add2Ptr(attr, roff);
203 if (fname->type == FILE_NAME_DOS)
204 goto next_attr;
205
206 links += 1;
207 if (name && name->len == fname->name_len &&
208 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
209 NULL, false))
210 is_match = true;
211
212 goto next_attr;
213
214 case ATTR_DATA:
215 if (is_dir) {
216 /* Ignore data attribute in dir record. */
217 goto next_attr;
218 }
219
220 if (ino == MFT_REC_BADCLUST && !attr->non_res)
221 goto next_attr;
222
223 if (attr->name_len &&
224 ((ino != MFT_REC_BADCLUST || !attr->non_res ||
225 attr->name_len != ARRAY_SIZE(BAD_NAME) ||
226 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
227 (ino != MFT_REC_SECURE || !attr->non_res ||
228 attr->name_len != ARRAY_SIZE(SDS_NAME) ||
229 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
230 /* File contains stream attribute. Ignore it. */
231 goto next_attr;
232 }
233
234 if (is_attr_sparsed(attr))
235 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
236 else
237 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
238
239 if (is_attr_compressed(attr))
240 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
241 else
242 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
243
244 if (is_attr_encrypted(attr))
245 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
246 else
247 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
248
249 if (!attr->non_res) {
250 ni->i_valid = inode->i_size = rsize;
251 inode_set_bytes(inode, rsize);
252 }
253
254 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
255
256 if (!attr->non_res) {
257 ni->ni_flags |= NI_FLAG_RESIDENT;
258 goto next_attr;
259 }
260
261 inode_set_bytes(inode, attr_ondisk_size(attr));
262
263 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
264 inode->i_size = le64_to_cpu(attr->nres.data_size);
265 if (!attr->nres.alloc_size)
266 goto next_attr;
267
268 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
269 &ni->file.run;
270 break;
271
272 case ATTR_ROOT:
273 if (attr->non_res)
274 goto out;
275
276 root = Add2Ptr(attr, roff);
277
278 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
279 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
280 goto next_attr;
281
282 if (root->type != ATTR_NAME ||
283 root->rule != NTFS_COLLATION_TYPE_FILENAME)
284 goto out;
285
286 if (!is_dir)
287 goto next_attr;
288
289 is_root = true;
290 ni->ni_flags |= NI_FLAG_DIR;
291
292 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
293 if (err)
294 goto out;
295
296 mode = sb->s_root ?
297 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
298 (S_IFDIR | 0777);
299 goto next_attr;
300
301 case ATTR_ALLOC:
302 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
303 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
304 goto next_attr;
305
306 inode->i_size = le64_to_cpu(attr->nres.data_size);
307 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
308 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
309
310 run = &ni->dir.alloc_run;
311 break;
312
313 case ATTR_BITMAP:
314 if (ino == MFT_REC_MFT) {
315 if (!attr->non_res)
316 goto out;
317 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
318 /* 0x20000000 = 2^32 / 8 */
319 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
320 goto out;
321 #endif
322 run = &sbi->mft.bitmap.run;
323 break;
324 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
325 !memcmp(attr_name(attr), I30_NAME,
326 sizeof(I30_NAME)) &&
327 attr->non_res) {
328 run = &ni->dir.bitmap_run;
329 break;
330 }
331 goto next_attr;
332
333 case ATTR_REPARSE:
334 if (attr->name_len)
335 goto next_attr;
336
337 rp_fa = ni_parse_reparse(ni, attr, &rp);
338 switch (rp_fa) {
339 case REPARSE_LINK:
340 /*
341 * Normal symlink.
342 * Assume one unicode symbol == one utf8.
343 */
344 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
345 .PrintNameLength) /
346 sizeof(u16);
347
348 ni->i_valid = inode->i_size;
349
350 /* Clear directory bit. */
351 if (ni->ni_flags & NI_FLAG_DIR) {
352 indx_clear(&ni->dir);
353 memset(&ni->dir, 0, sizeof(ni->dir));
354 ni->ni_flags &= ~NI_FLAG_DIR;
355 } else {
356 run_close(&ni->file.run);
357 }
358 mode = S_IFLNK | 0777;
359 is_dir = false;
360 if (attr->non_res) {
361 run = &ni->file.run;
362 goto attr_unpack_run; // Double break.
363 }
364 break;
365
366 case REPARSE_COMPRESSED:
367 break;
368
369 case REPARSE_DEDUPLICATED:
370 break;
371 }
372 goto next_attr;
373
374 case ATTR_EA_INFO:
375 if (!attr->name_len &&
376 resident_data_ex(attr, sizeof(struct EA_INFO))) {
377 ni->ni_flags |= NI_FLAG_EA;
378 /*
379 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
380 */
381 inode->i_mode = mode;
382 ntfs_get_wsl_perm(inode);
383 mode = inode->i_mode;
384 }
385 goto next_attr;
386
387 default:
388 goto next_attr;
389 }
390
391 attr_unpack_run:
392 roff = le16_to_cpu(attr->nres.run_off);
393
394 if (roff > asize) {
395 err = -EINVAL;
396 goto out;
397 }
398
399 t64 = le64_to_cpu(attr->nres.svcn);
400
401 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
402 t64, Add2Ptr(attr, roff), asize - roff);
403 if (err < 0)
404 goto out;
405 err = 0;
406 goto next_attr;
407
408 end_enum:
409
410 if (!std5)
411 goto out;
412
413 if (!is_match && name) {
414 err = -ENOENT;
415 goto out;
416 }
417
418 if (std5->fa & FILE_ATTRIBUTE_READONLY)
419 mode &= ~0222;
420
421 if (!names) {
422 err = -EINVAL;
423 goto out;
424 }
425
426 if (names != le16_to_cpu(rec->hard_links)) {
427 /* Correct minor error on the fly. Do not mark inode as dirty. */
428 ntfs_inode_warn(inode, "Correct links count -> %u.", names);
429 rec->hard_links = cpu_to_le16(names);
430 ni->mi.dirty = true;
431 }
432
433 set_nlink(inode, links);
434
435 if (S_ISDIR(mode)) {
436 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
437
438 /*
439 * Dot and dot-dot should be included in count but was not
440 * included in enumeration.
441 * Usually a hard links to directories are disabled.
442 */
443 inode->i_op = &ntfs_dir_inode_operations;
444 inode->i_fop = &ntfs_dir_operations;
445 ni->i_valid = 0;
446 } else if (S_ISLNK(mode)) {
447 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
448 inode->i_op = &ntfs_link_inode_operations;
449 inode->i_fop = NULL;
450 inode_nohighmem(inode);
451 } else if (S_ISREG(mode)) {
452 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
453 inode->i_op = &ntfs_file_inode_operations;
454 inode->i_fop = &ntfs_file_operations;
455 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
456 &ntfs_aops;
457 if (ino != MFT_REC_MFT)
458 init_rwsem(&ni->file.run_lock);
459 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
460 S_ISSOCK(mode)) {
461 inode->i_op = &ntfs_special_inode_operations;
462 init_special_inode(inode, mode, inode->i_rdev);
463 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
464 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
465 /* Records in $Extend are not a files or general directories. */
466 inode->i_op = &ntfs_file_inode_operations;
467 } else {
468 err = -EINVAL;
469 goto out;
470 }
471
472 if ((sbi->options->sys_immutable &&
473 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
474 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
475 inode->i_flags |= S_IMMUTABLE;
476 } else {
477 inode->i_flags &= ~S_IMMUTABLE;
478 }
479
480 inode->i_mode = mode;
481 if (!(ni->ni_flags & NI_FLAG_EA)) {
482 /* If no xattr then no security (stored in xattr). */
483 inode->i_flags |= S_NOSEC;
484 }
485
486 if (ino == MFT_REC_MFT && !sb->s_root)
487 sbi->mft.ni = NULL;
488
489 unlock_new_inode(inode);
490
491 return inode;
492
493 out:
494 if (ino == MFT_REC_MFT && !sb->s_root)
495 sbi->mft.ni = NULL;
496
497 iget_failed(inode);
498 return ERR_PTR(err);
499 }
500
501 /*
502 * ntfs_test_inode
503 *
504 * Return: 1 if match.
505 */
ntfs_test_inode(struct inode * inode,void * data)506 static int ntfs_test_inode(struct inode *inode, void *data)
507 {
508 struct MFT_REF *ref = data;
509
510 return ino_get(ref) == inode->i_ino;
511 }
512
ntfs_set_inode(struct inode * inode,void * data)513 static int ntfs_set_inode(struct inode *inode, void *data)
514 {
515 const struct MFT_REF *ref = data;
516
517 inode->i_ino = ino_get(ref);
518 return 0;
519 }
520
ntfs_iget5(struct super_block * sb,const struct MFT_REF * ref,const struct cpu_str * name)521 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
522 const struct cpu_str *name)
523 {
524 struct inode *inode;
525
526 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
527 (void *)ref);
528 if (unlikely(!inode))
529 return ERR_PTR(-ENOMEM);
530
531 /* If this is a freshly allocated inode, need to read it now. */
532 if (inode->i_state & I_NEW)
533 inode = ntfs_read_mft(inode, name, ref);
534 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
535 /*
536 * Sequence number is not expected.
537 * Looks like inode was reused but caller uses the old reference
538 */
539 iput(inode);
540 inode = ERR_PTR(-ESTALE);
541 }
542
543 if (IS_ERR(inode))
544 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
545
546 return inode;
547 }
548
549 enum get_block_ctx {
550 GET_BLOCK_GENERAL = 0,
551 GET_BLOCK_WRITE_BEGIN = 1,
552 GET_BLOCK_DIRECT_IO_R = 2,
553 GET_BLOCK_DIRECT_IO_W = 3,
554 GET_BLOCK_BMAP = 4,
555 };
556
ntfs_get_block_vbo(struct inode * inode,u64 vbo,struct buffer_head * bh,int create,enum get_block_ctx ctx)557 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
558 struct buffer_head *bh, int create,
559 enum get_block_ctx ctx)
560 {
561 struct super_block *sb = inode->i_sb;
562 struct ntfs_sb_info *sbi = sb->s_fs_info;
563 struct ntfs_inode *ni = ntfs_i(inode);
564 struct folio *folio = bh->b_folio;
565 u8 cluster_bits = sbi->cluster_bits;
566 u32 block_size = sb->s_blocksize;
567 u64 bytes, lbo, valid;
568 u32 off;
569 int err;
570 CLST vcn, lcn, len;
571 bool new;
572
573 /* Clear previous state. */
574 clear_buffer_new(bh);
575 clear_buffer_uptodate(bh);
576
577 if (is_resident(ni)) {
578 bh->b_blocknr = RESIDENT_LCN;
579 bh->b_size = block_size;
580 if (!folio) {
581 err = 0;
582 } else {
583 ni_lock(ni);
584 err = attr_data_read_resident(ni, &folio->page);
585 ni_unlock(ni);
586
587 if (!err)
588 set_buffer_uptodate(bh);
589 }
590 return err;
591 }
592
593 vcn = vbo >> cluster_bits;
594 off = vbo & sbi->cluster_mask;
595 new = false;
596
597 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
598 create && sbi->cluster_size > PAGE_SIZE);
599 if (err)
600 goto out;
601
602 if (!len)
603 return 0;
604
605 bytes = ((u64)len << cluster_bits) - off;
606
607 if (lcn == SPARSE_LCN) {
608 if (!create) {
609 if (bh->b_size > bytes)
610 bh->b_size = bytes;
611 return 0;
612 }
613 WARN_ON(1);
614 }
615
616 if (new)
617 set_buffer_new(bh);
618
619 lbo = ((u64)lcn << cluster_bits) + off;
620
621 set_buffer_mapped(bh);
622 bh->b_bdev = sb->s_bdev;
623 bh->b_blocknr = lbo >> sb->s_blocksize_bits;
624
625 valid = ni->i_valid;
626
627 if (ctx == GET_BLOCK_DIRECT_IO_W) {
628 /* ntfs_direct_IO will update ni->i_valid. */
629 if (vbo >= valid)
630 set_buffer_new(bh);
631 } else if (create) {
632 /* Normal write. */
633 if (bytes > bh->b_size)
634 bytes = bh->b_size;
635
636 if (vbo >= valid)
637 set_buffer_new(bh);
638
639 if (vbo + bytes > valid) {
640 ni->i_valid = vbo + bytes;
641 mark_inode_dirty(inode);
642 }
643 } else if (vbo >= valid) {
644 /* Read out of valid data. */
645 clear_buffer_mapped(bh);
646 } else if (vbo + bytes <= valid) {
647 /* Normal read. */
648 } else if (vbo + block_size <= valid) {
649 /* Normal short read. */
650 bytes = block_size;
651 } else {
652 /*
653 * Read across valid size: vbo < valid && valid < vbo + block_size
654 */
655 bytes = block_size;
656
657 if (folio) {
658 u32 voff = valid - vbo;
659
660 bh->b_size = block_size;
661 off = vbo & (PAGE_SIZE - 1);
662 folio_set_bh(bh, folio, off);
663
664 err = bh_read(bh, 0);
665 if (err < 0)
666 goto out;
667 folio_zero_segment(folio, off + voff, off + block_size);
668 }
669 }
670
671 if (bh->b_size > bytes)
672 bh->b_size = bytes;
673
674 #ifndef __LP64__
675 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
676 static_assert(sizeof(size_t) < sizeof(loff_t));
677 if (bytes > 0x40000000u)
678 bh->b_size = 0x40000000u;
679 }
680 #endif
681
682 return 0;
683
684 out:
685 return err;
686 }
687
ntfs_get_block(struct inode * inode,sector_t vbn,struct buffer_head * bh_result,int create)688 int ntfs_get_block(struct inode *inode, sector_t vbn,
689 struct buffer_head *bh_result, int create)
690 {
691 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
692 bh_result, create, GET_BLOCK_GENERAL);
693 }
694
ntfs_get_block_bmap(struct inode * inode,sector_t vsn,struct buffer_head * bh_result,int create)695 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
696 struct buffer_head *bh_result, int create)
697 {
698 return ntfs_get_block_vbo(inode,
699 (u64)vsn << inode->i_sb->s_blocksize_bits,
700 bh_result, create, GET_BLOCK_BMAP);
701 }
702
ntfs_bmap(struct address_space * mapping,sector_t block)703 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
704 {
705 return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
706 }
707
ntfs_read_folio(struct file * file,struct folio * folio)708 static int ntfs_read_folio(struct file *file, struct folio *folio)
709 {
710 struct page *page = &folio->page;
711 int err;
712 struct address_space *mapping = page->mapping;
713 struct inode *inode = mapping->host;
714 struct ntfs_inode *ni = ntfs_i(inode);
715
716 if (is_resident(ni)) {
717 ni_lock(ni);
718 err = attr_data_read_resident(ni, page);
719 ni_unlock(ni);
720 if (err != E_NTFS_NONRESIDENT) {
721 unlock_page(page);
722 return err;
723 }
724 }
725
726 if (is_compressed(ni)) {
727 ni_lock(ni);
728 err = ni_readpage_cmpr(ni, page);
729 ni_unlock(ni);
730 return err;
731 }
732
733 /* Normal + sparse files. */
734 return mpage_read_folio(folio, ntfs_get_block);
735 }
736
ntfs_readahead(struct readahead_control * rac)737 static void ntfs_readahead(struct readahead_control *rac)
738 {
739 struct address_space *mapping = rac->mapping;
740 struct inode *inode = mapping->host;
741 struct ntfs_inode *ni = ntfs_i(inode);
742 u64 valid;
743 loff_t pos;
744
745 if (is_resident(ni)) {
746 /* No readahead for resident. */
747 return;
748 }
749
750 if (is_compressed(ni)) {
751 /* No readahead for compressed. */
752 return;
753 }
754
755 valid = ni->i_valid;
756 pos = readahead_pos(rac);
757
758 if (valid < i_size_read(inode) && pos <= valid &&
759 valid < pos + readahead_length(rac)) {
760 /* Range cross 'valid'. Read it page by page. */
761 return;
762 }
763
764 mpage_readahead(rac, ntfs_get_block);
765 }
766
ntfs_get_block_direct_IO_R(struct inode * inode,sector_t iblock,struct buffer_head * bh_result,int create)767 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
768 struct buffer_head *bh_result, int create)
769 {
770 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
771 bh_result, create, GET_BLOCK_DIRECT_IO_R);
772 }
773
ntfs_get_block_direct_IO_W(struct inode * inode,sector_t iblock,struct buffer_head * bh_result,int create)774 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
775 struct buffer_head *bh_result, int create)
776 {
777 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
778 bh_result, create, GET_BLOCK_DIRECT_IO_W);
779 }
780
ntfs_direct_IO(struct kiocb * iocb,struct iov_iter * iter)781 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
782 {
783 struct file *file = iocb->ki_filp;
784 struct address_space *mapping = file->f_mapping;
785 struct inode *inode = mapping->host;
786 struct ntfs_inode *ni = ntfs_i(inode);
787 loff_t vbo = iocb->ki_pos;
788 loff_t end;
789 int wr = iov_iter_rw(iter) & WRITE;
790 size_t iter_count = iov_iter_count(iter);
791 loff_t valid;
792 ssize_t ret;
793
794 if (is_resident(ni)) {
795 /* Switch to buffered write. */
796 ret = 0;
797 goto out;
798 }
799
800 ret = blockdev_direct_IO(iocb, inode, iter,
801 wr ? ntfs_get_block_direct_IO_W :
802 ntfs_get_block_direct_IO_R);
803
804 if (ret > 0)
805 end = vbo + ret;
806 else if (wr && ret == -EIOCBQUEUED)
807 end = vbo + iter_count;
808 else
809 goto out;
810
811 valid = ni->i_valid;
812 if (wr) {
813 if (end > valid && !S_ISBLK(inode->i_mode)) {
814 ni->i_valid = end;
815 mark_inode_dirty(inode);
816 }
817 } else if (vbo < valid && valid < end) {
818 /* Fix page. */
819 iov_iter_revert(iter, end - valid);
820 iov_iter_zero(end - valid, iter);
821 }
822
823 out:
824 return ret;
825 }
826
ntfs_set_size(struct inode * inode,u64 new_size)827 int ntfs_set_size(struct inode *inode, u64 new_size)
828 {
829 struct super_block *sb = inode->i_sb;
830 struct ntfs_sb_info *sbi = sb->s_fs_info;
831 struct ntfs_inode *ni = ntfs_i(inode);
832 int err;
833
834 /* Check for maximum file size. */
835 if (is_sparsed(ni) || is_compressed(ni)) {
836 if (new_size > sbi->maxbytes_sparse) {
837 err = -EFBIG;
838 goto out;
839 }
840 } else if (new_size > sbi->maxbytes) {
841 err = -EFBIG;
842 goto out;
843 }
844
845 ni_lock(ni);
846 down_write(&ni->file.run_lock);
847
848 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
849 &ni->i_valid, true, NULL);
850
851 up_write(&ni->file.run_lock);
852 ni_unlock(ni);
853
854 mark_inode_dirty(inode);
855
856 out:
857 return err;
858 }
859
ntfs_resident_writepage(struct folio * folio,struct writeback_control * wbc,void * data)860 static int ntfs_resident_writepage(struct folio *folio,
861 struct writeback_control *wbc, void *data)
862 {
863 struct address_space *mapping = data;
864 struct inode *inode = mapping->host;
865 struct ntfs_inode *ni = ntfs_i(inode);
866 int ret;
867
868 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
869 return -EIO;
870
871 ni_lock(ni);
872 ret = attr_data_write_resident(ni, &folio->page);
873 ni_unlock(ni);
874
875 if (ret != E_NTFS_NONRESIDENT)
876 folio_unlock(folio);
877 mapping_set_error(mapping, ret);
878 return ret;
879 }
880
ntfs_writepages(struct address_space * mapping,struct writeback_control * wbc)881 static int ntfs_writepages(struct address_space *mapping,
882 struct writeback_control *wbc)
883 {
884 struct inode *inode = mapping->host;
885
886 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
887 return -EIO;
888
889 if (is_resident(ntfs_i(inode)))
890 return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
891 mapping);
892 return mpage_writepages(mapping, wbc, ntfs_get_block);
893 }
894
ntfs_get_block_write_begin(struct inode * inode,sector_t vbn,struct buffer_head * bh_result,int create)895 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
896 struct buffer_head *bh_result, int create)
897 {
898 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
899 bh_result, create, GET_BLOCK_WRITE_BEGIN);
900 }
901
ntfs_write_begin(struct file * file,struct address_space * mapping,loff_t pos,u32 len,struct page ** pagep,void ** fsdata)902 int ntfs_write_begin(struct file *file, struct address_space *mapping,
903 loff_t pos, u32 len, struct page **pagep, void **fsdata)
904 {
905 int err;
906 struct inode *inode = mapping->host;
907 struct ntfs_inode *ni = ntfs_i(inode);
908
909 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
910 return -EIO;
911
912 *pagep = NULL;
913 if (is_resident(ni)) {
914 struct page *page =
915 grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT);
916
917 if (!page) {
918 err = -ENOMEM;
919 goto out;
920 }
921
922 ni_lock(ni);
923 err = attr_data_read_resident(ni, page);
924 ni_unlock(ni);
925
926 if (!err) {
927 *pagep = page;
928 goto out;
929 }
930 unlock_page(page);
931 put_page(page);
932
933 if (err != E_NTFS_NONRESIDENT)
934 goto out;
935 }
936
937 err = block_write_begin(mapping, pos, len, pagep,
938 ntfs_get_block_write_begin);
939
940 out:
941 return err;
942 }
943
944 /*
945 * ntfs_write_end - Address_space_operations::write_end.
946 */
ntfs_write_end(struct file * file,struct address_space * mapping,loff_t pos,u32 len,u32 copied,struct page * page,void * fsdata)947 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
948 u32 len, u32 copied, struct page *page, void *fsdata)
949 {
950 struct inode *inode = mapping->host;
951 struct ntfs_inode *ni = ntfs_i(inode);
952 u64 valid = ni->i_valid;
953 bool dirty = false;
954 int err;
955
956 if (is_resident(ni)) {
957 ni_lock(ni);
958 err = attr_data_write_resident(ni, page);
959 ni_unlock(ni);
960 if (!err) {
961 dirty = true;
962 /* Clear any buffers in page. */
963 if (page_has_buffers(page)) {
964 struct buffer_head *head, *bh;
965
966 bh = head = page_buffers(page);
967 do {
968 clear_buffer_dirty(bh);
969 clear_buffer_mapped(bh);
970 set_buffer_uptodate(bh);
971 } while (head != (bh = bh->b_this_page));
972 }
973 SetPageUptodate(page);
974 err = copied;
975 }
976 unlock_page(page);
977 put_page(page);
978 } else {
979 err = generic_write_end(file, mapping, pos, len, copied, page,
980 fsdata);
981 }
982
983 if (err >= 0) {
984 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
985 inode->i_mtime = inode_set_ctime_current(inode);
986 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
987 dirty = true;
988 }
989
990 if (valid != ni->i_valid) {
991 /* ni->i_valid is changed in ntfs_get_block_vbo. */
992 dirty = true;
993 }
994
995 if (pos + err > inode->i_size) {
996 i_size_write(inode, pos + err);
997 dirty = true;
998 }
999
1000 if (dirty)
1001 mark_inode_dirty(inode);
1002 }
1003
1004 return err;
1005 }
1006
reset_log_file(struct inode * inode)1007 int reset_log_file(struct inode *inode)
1008 {
1009 int err;
1010 loff_t pos = 0;
1011 u32 log_size = inode->i_size;
1012 struct address_space *mapping = inode->i_mapping;
1013
1014 for (;;) {
1015 u32 len;
1016 void *kaddr;
1017 struct page *page;
1018
1019 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
1020
1021 err = block_write_begin(mapping, pos, len, &page,
1022 ntfs_get_block_write_begin);
1023 if (err)
1024 goto out;
1025
1026 kaddr = kmap_atomic(page);
1027 memset(kaddr, -1, len);
1028 kunmap_atomic(kaddr);
1029 flush_dcache_page(page);
1030
1031 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
1032 if (err < 0)
1033 goto out;
1034 pos += len;
1035
1036 if (pos >= log_size)
1037 break;
1038 balance_dirty_pages_ratelimited(mapping);
1039 }
1040 out:
1041 mark_inode_dirty_sync(inode);
1042
1043 return err;
1044 }
1045
ntfs3_write_inode(struct inode * inode,struct writeback_control * wbc)1046 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1047 {
1048 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1049 }
1050
ntfs_sync_inode(struct inode * inode)1051 int ntfs_sync_inode(struct inode *inode)
1052 {
1053 return _ni_write_inode(inode, 1);
1054 }
1055
1056 /*
1057 * writeback_inode - Helper function for ntfs_flush_inodes().
1058 *
1059 * This writes both the inode and the file data blocks, waiting
1060 * for in flight data blocks before the start of the call. It
1061 * does not wait for any io started during the call.
1062 */
writeback_inode(struct inode * inode)1063 static int writeback_inode(struct inode *inode)
1064 {
1065 int ret = sync_inode_metadata(inode, 0);
1066
1067 if (!ret)
1068 ret = filemap_fdatawrite(inode->i_mapping);
1069 return ret;
1070 }
1071
1072 /*
1073 * ntfs_flush_inodes
1074 *
1075 * Write data and metadata corresponding to i1 and i2. The io is
1076 * started but we do not wait for any of it to finish.
1077 *
1078 * filemap_flush() is used for the block device, so if there is a dirty
1079 * page for a block already in flight, we will not wait and start the
1080 * io over again.
1081 */
ntfs_flush_inodes(struct super_block * sb,struct inode * i1,struct inode * i2)1082 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1083 struct inode *i2)
1084 {
1085 int ret = 0;
1086
1087 if (i1)
1088 ret = writeback_inode(i1);
1089 if (!ret && i2)
1090 ret = writeback_inode(i2);
1091 if (!ret)
1092 ret = sync_blockdev_nowait(sb->s_bdev);
1093 return ret;
1094 }
1095
inode_write_data(struct inode * inode,const void * data,size_t bytes)1096 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1097 {
1098 pgoff_t idx;
1099
1100 /* Write non resident data. */
1101 for (idx = 0; bytes; idx++) {
1102 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1103 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1104
1105 if (IS_ERR(page))
1106 return PTR_ERR(page);
1107
1108 lock_page(page);
1109 WARN_ON(!PageUptodate(page));
1110 ClearPageUptodate(page);
1111
1112 memcpy(page_address(page), data, op);
1113
1114 flush_dcache_page(page);
1115 SetPageUptodate(page);
1116 unlock_page(page);
1117
1118 ntfs_unmap_page(page);
1119
1120 bytes -= op;
1121 data = Add2Ptr(data, PAGE_SIZE);
1122 }
1123 return 0;
1124 }
1125
1126 /*
1127 * ntfs_reparse_bytes
1128 *
1129 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1130 * for unicode string of @uni_len length.
1131 */
ntfs_reparse_bytes(u32 uni_len)1132 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1133 {
1134 /* Header + unicode string + decorated unicode string. */
1135 return sizeof(short) * (2 * uni_len + 4) +
1136 offsetof(struct REPARSE_DATA_BUFFER,
1137 SymbolicLinkReparseBuffer.PathBuffer);
1138 }
1139
1140 static struct REPARSE_DATA_BUFFER *
ntfs_create_reparse_buffer(struct ntfs_sb_info * sbi,const char * symname,u32 size,u16 * nsize)1141 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1142 u32 size, u16 *nsize)
1143 {
1144 int i, err;
1145 struct REPARSE_DATA_BUFFER *rp;
1146 __le16 *rp_name;
1147 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1148
1149 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1150 if (!rp)
1151 return ERR_PTR(-ENOMEM);
1152
1153 rs = &rp->SymbolicLinkReparseBuffer;
1154 rp_name = rs->PathBuffer;
1155
1156 /* Convert link name to UTF-16. */
1157 err = ntfs_nls_to_utf16(sbi, symname, size,
1158 (struct cpu_str *)(rp_name - 1), 2 * size,
1159 UTF16_LITTLE_ENDIAN);
1160 if (err < 0)
1161 goto out;
1162
1163 /* err = the length of unicode name of symlink. */
1164 *nsize = ntfs_reparse_bytes(err);
1165
1166 if (*nsize > sbi->reparse.max_size) {
1167 err = -EFBIG;
1168 goto out;
1169 }
1170
1171 /* Translate Linux '/' into Windows '\'. */
1172 for (i = 0; i < err; i++) {
1173 if (rp_name[i] == cpu_to_le16('/'))
1174 rp_name[i] = cpu_to_le16('\\');
1175 }
1176
1177 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1178 rp->ReparseDataLength =
1179 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1180 SymbolicLinkReparseBuffer));
1181
1182 /* PrintName + SubstituteName. */
1183 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1184 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1185 rs->PrintNameLength = rs->SubstituteNameOffset;
1186
1187 /*
1188 * TODO: Use relative path if possible to allow Windows to
1189 * parse this path.
1190 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1191 */
1192 rs->Flags = 0;
1193
1194 memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1195
1196 /* Decorate SubstituteName. */
1197 rp_name += err;
1198 rp_name[0] = cpu_to_le16('\\');
1199 rp_name[1] = cpu_to_le16('?');
1200 rp_name[2] = cpu_to_le16('?');
1201 rp_name[3] = cpu_to_le16('\\');
1202
1203 return rp;
1204 out:
1205 kfree(rp);
1206 return ERR_PTR(err);
1207 }
1208
1209 /*
1210 * ntfs_create_inode
1211 *
1212 * Helper function for:
1213 * - ntfs_create
1214 * - ntfs_mknod
1215 * - ntfs_symlink
1216 * - ntfs_mkdir
1217 * - ntfs_atomic_open
1218 *
1219 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1220 */
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)1221 struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1222 struct dentry *dentry,
1223 const struct cpu_str *uni, umode_t mode,
1224 dev_t dev, const char *symname, u32 size,
1225 struct ntfs_fnd *fnd)
1226 {
1227 int err;
1228 struct super_block *sb = dir->i_sb;
1229 struct ntfs_sb_info *sbi = sb->s_fs_info;
1230 const struct qstr *name = &dentry->d_name;
1231 CLST ino = 0;
1232 struct ntfs_inode *dir_ni = ntfs_i(dir);
1233 struct ntfs_inode *ni = NULL;
1234 struct inode *inode = NULL;
1235 struct ATTRIB *attr;
1236 struct ATTR_STD_INFO5 *std5;
1237 struct ATTR_FILE_NAME *fname;
1238 struct MFT_REC *rec;
1239 u32 asize, dsize, sd_size;
1240 enum FILE_ATTRIBUTE fa;
1241 __le32 security_id = SECURITY_ID_INVALID;
1242 CLST vcn;
1243 const void *sd;
1244 u16 t16, nsize = 0, aid = 0;
1245 struct INDEX_ROOT *root, *dir_root;
1246 struct NTFS_DE *e, *new_de = NULL;
1247 struct REPARSE_DATA_BUFFER *rp = NULL;
1248 bool rp_inserted = false;
1249
1250 if (!fnd)
1251 ni_lock_dir(dir_ni);
1252
1253 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1254 if (!dir_root) {
1255 err = -EINVAL;
1256 goto out1;
1257 }
1258
1259 if (S_ISDIR(mode)) {
1260 /* Use parent's directory attributes. */
1261 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1262 FILE_ATTRIBUTE_ARCHIVE;
1263 /*
1264 * By default child directory inherits parent attributes.
1265 * Root directory is hidden + system.
1266 * Make an exception for children in root.
1267 */
1268 if (dir->i_ino == MFT_REC_ROOT)
1269 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1270 } else if (S_ISLNK(mode)) {
1271 /* It is good idea that link should be the same type (file/dir) as target */
1272 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1273
1274 /*
1275 * Linux: there are dir/file/symlink and so on.
1276 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1277 * It is good idea to create:
1278 * dir + reparse if 'symname' points to directory
1279 * or
1280 * file + reparse if 'symname' points to file
1281 * Unfortunately kern_path hangs if symname contains 'dir'.
1282 */
1283
1284 /*
1285 * struct path path;
1286 *
1287 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1288 * struct inode *target = d_inode(path.dentry);
1289 *
1290 * if (S_ISDIR(target->i_mode))
1291 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1292 * // if ( target->i_sb == sb ){
1293 * // use relative path?
1294 * // }
1295 * path_put(&path);
1296 * }
1297 */
1298 } else if (S_ISREG(mode)) {
1299 if (sbi->options->sparse) {
1300 /* Sparsed regular file, cause option 'sparse'. */
1301 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1302 FILE_ATTRIBUTE_ARCHIVE;
1303 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1304 /* Compressed regular file, if parent is compressed. */
1305 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1306 } else {
1307 /* Regular file, default attributes. */
1308 fa = FILE_ATTRIBUTE_ARCHIVE;
1309 }
1310 } else {
1311 fa = FILE_ATTRIBUTE_ARCHIVE;
1312 }
1313
1314 /* If option "hide_dot_files" then set hidden attribute for dot files. */
1315 if (sbi->options->hide_dot_files && name->name[0] == '.')
1316 fa |= FILE_ATTRIBUTE_HIDDEN;
1317
1318 if (!(mode & 0222))
1319 fa |= FILE_ATTRIBUTE_READONLY;
1320
1321 /* Allocate PATH_MAX bytes. */
1322 new_de = __getname();
1323 if (!new_de) {
1324 err = -ENOMEM;
1325 goto out1;
1326 }
1327
1328 if (unlikely(ntfs3_forced_shutdown(sb))) {
1329 err = -EIO;
1330 goto out2;
1331 }
1332
1333 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1334 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1335
1336 /* Step 1: allocate and fill new mft record. */
1337 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1338 if (err)
1339 goto out2;
1340
1341 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1342 if (IS_ERR(ni)) {
1343 err = PTR_ERR(ni);
1344 ni = NULL;
1345 goto out3;
1346 }
1347 inode = &ni->vfs_inode;
1348 inode_init_owner(idmap, inode, dir, mode);
1349 mode = inode->i_mode;
1350
1351 ni->i_crtime = current_time(inode);
1352
1353 rec = ni->mi.mrec;
1354 rec->hard_links = cpu_to_le16(1);
1355 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1356
1357 /* Get default security id. */
1358 sd = s_default_security;
1359 sd_size = sizeof(s_default_security);
1360
1361 if (is_ntfs3(sbi)) {
1362 security_id = dir_ni->std_security_id;
1363 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1364 security_id = sbi->security.def_security_id;
1365
1366 if (security_id == SECURITY_ID_INVALID &&
1367 !ntfs_insert_security(sbi, sd, sd_size,
1368 &security_id, NULL))
1369 sbi->security.def_security_id = security_id;
1370 }
1371 }
1372
1373 /* Insert standard info. */
1374 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1375
1376 if (security_id == SECURITY_ID_INVALID) {
1377 dsize = sizeof(struct ATTR_STD_INFO);
1378 } else {
1379 dsize = sizeof(struct ATTR_STD_INFO5);
1380 std5->security_id = security_id;
1381 ni->std_security_id = security_id;
1382 }
1383 asize = SIZEOF_RESIDENT + dsize;
1384
1385 attr->type = ATTR_STD;
1386 attr->size = cpu_to_le32(asize);
1387 attr->id = cpu_to_le16(aid++);
1388 attr->res.data_off = SIZEOF_RESIDENT_LE;
1389 attr->res.data_size = cpu_to_le32(dsize);
1390
1391 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1392 kernel2nt(&ni->i_crtime);
1393
1394 std5->fa = ni->std_fa = fa;
1395
1396 attr = Add2Ptr(attr, asize);
1397
1398 /* Insert file name. */
1399 err = fill_name_de(sbi, new_de, name, uni);
1400 if (err)
1401 goto out4;
1402
1403 mi_get_ref(&ni->mi, &new_de->ref);
1404
1405 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1406
1407 if (sbi->options->windows_names &&
1408 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1409 err = -EINVAL;
1410 goto out4;
1411 }
1412
1413 mi_get_ref(&dir_ni->mi, &fname->home);
1414 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1415 fname->dup.a_time = std5->cr_time;
1416 fname->dup.alloc_size = fname->dup.data_size = 0;
1417 fname->dup.fa = std5->fa;
1418 fname->dup.ea_size = fname->dup.reparse = 0;
1419
1420 dsize = le16_to_cpu(new_de->key_size);
1421 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1422
1423 attr->type = ATTR_NAME;
1424 attr->size = cpu_to_le32(asize);
1425 attr->res.data_off = SIZEOF_RESIDENT_LE;
1426 attr->res.flags = RESIDENT_FLAG_INDEXED;
1427 attr->id = cpu_to_le16(aid++);
1428 attr->res.data_size = cpu_to_le32(dsize);
1429 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1430
1431 attr = Add2Ptr(attr, asize);
1432
1433 if (security_id == SECURITY_ID_INVALID) {
1434 /* Insert security attribute. */
1435 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1436
1437 attr->type = ATTR_SECURE;
1438 attr->size = cpu_to_le32(asize);
1439 attr->id = cpu_to_le16(aid++);
1440 attr->res.data_off = SIZEOF_RESIDENT_LE;
1441 attr->res.data_size = cpu_to_le32(sd_size);
1442 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1443
1444 attr = Add2Ptr(attr, asize);
1445 }
1446
1447 attr->id = cpu_to_le16(aid++);
1448 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1449 /*
1450 * Regular directory or symlink to directory.
1451 * Create root attribute.
1452 */
1453 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1454 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1455
1456 attr->type = ATTR_ROOT;
1457 attr->size = cpu_to_le32(asize);
1458
1459 attr->name_len = ARRAY_SIZE(I30_NAME);
1460 attr->name_off = SIZEOF_RESIDENT_LE;
1461 attr->res.data_off =
1462 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1463 attr->res.data_size = cpu_to_le32(dsize);
1464 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1465 sizeof(I30_NAME));
1466
1467 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1468 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1469 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1470 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1471 sizeof(struct NTFS_DE));
1472 root->ihdr.total = root->ihdr.used;
1473
1474 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1475 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1476 e->flags = NTFS_IE_LAST;
1477 } else if (S_ISLNK(mode)) {
1478 /*
1479 * Symlink to file.
1480 * Create empty resident data attribute.
1481 */
1482 asize = SIZEOF_RESIDENT;
1483
1484 /* Insert empty ATTR_DATA */
1485 attr->type = ATTR_DATA;
1486 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1487 attr->name_off = SIZEOF_RESIDENT_LE;
1488 attr->res.data_off = SIZEOF_RESIDENT_LE;
1489 } else if (S_ISREG(mode)) {
1490 /*
1491 * Regular file. Create empty non resident data attribute.
1492 */
1493 attr->type = ATTR_DATA;
1494 attr->non_res = 1;
1495 attr->nres.evcn = cpu_to_le64(-1ll);
1496 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1497 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1498 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1499 attr->flags = ATTR_FLAG_SPARSED;
1500 asize = SIZEOF_NONRESIDENT_EX + 8;
1501 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1502 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1503 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1504 attr->flags = ATTR_FLAG_COMPRESSED;
1505 attr->nres.c_unit = NTFS_LZNT_CUNIT;
1506 asize = SIZEOF_NONRESIDENT_EX + 8;
1507 } else {
1508 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1509 attr->name_off = SIZEOF_NONRESIDENT_LE;
1510 asize = SIZEOF_NONRESIDENT + 8;
1511 }
1512 attr->nres.run_off = attr->name_off;
1513 } else {
1514 /*
1515 * Node. Create empty resident data attribute.
1516 */
1517 attr->type = ATTR_DATA;
1518 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1519 attr->name_off = SIZEOF_RESIDENT_LE;
1520 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1521 attr->flags = ATTR_FLAG_SPARSED;
1522 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1523 attr->flags = ATTR_FLAG_COMPRESSED;
1524 attr->res.data_off = SIZEOF_RESIDENT_LE;
1525 asize = SIZEOF_RESIDENT;
1526 ni->ni_flags |= NI_FLAG_RESIDENT;
1527 }
1528
1529 if (S_ISDIR(mode)) {
1530 ni->ni_flags |= NI_FLAG_DIR;
1531 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1532 if (err)
1533 goto out4;
1534 } else if (S_ISLNK(mode)) {
1535 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1536
1537 if (IS_ERR(rp)) {
1538 err = PTR_ERR(rp);
1539 rp = NULL;
1540 goto out4;
1541 }
1542
1543 /*
1544 * Insert ATTR_REPARSE.
1545 */
1546 attr = Add2Ptr(attr, asize);
1547 attr->type = ATTR_REPARSE;
1548 attr->id = cpu_to_le16(aid++);
1549
1550 /* Resident or non resident? */
1551 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1552 t16 = PtrOffset(rec, attr);
1553
1554 /*
1555 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1556 * It is good idea to keep extened attributes resident.
1557 */
1558 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1559 CLST alen;
1560 CLST clst = bytes_to_cluster(sbi, nsize);
1561
1562 /* Bytes per runs. */
1563 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1564
1565 attr->non_res = 1;
1566 attr->nres.evcn = cpu_to_le64(clst - 1);
1567 attr->name_off = SIZEOF_NONRESIDENT_LE;
1568 attr->nres.run_off = attr->name_off;
1569 attr->nres.data_size = cpu_to_le64(nsize);
1570 attr->nres.valid_size = attr->nres.data_size;
1571 attr->nres.alloc_size =
1572 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1573
1574 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1575 clst, NULL, ALLOCATE_DEF,
1576 &alen, 0, NULL, NULL);
1577 if (err)
1578 goto out5;
1579
1580 err = run_pack(&ni->file.run, 0, clst,
1581 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1582 &vcn);
1583 if (err < 0)
1584 goto out5;
1585
1586 if (vcn != clst) {
1587 err = -EINVAL;
1588 goto out5;
1589 }
1590
1591 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1592 /* Write non resident data. */
1593 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1594 nsize, 0);
1595 if (err)
1596 goto out5;
1597 } else {
1598 attr->res.data_off = SIZEOF_RESIDENT_LE;
1599 attr->res.data_size = cpu_to_le32(nsize);
1600 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1601 }
1602 /* Size of symlink equals the length of input string. */
1603 inode->i_size = size;
1604
1605 attr->size = cpu_to_le32(asize);
1606
1607 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1608 &new_de->ref);
1609 if (err)
1610 goto out5;
1611
1612 rp_inserted = true;
1613 }
1614
1615 attr = Add2Ptr(attr, asize);
1616 attr->type = ATTR_END;
1617
1618 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1619 rec->next_attr_id = cpu_to_le16(aid);
1620
1621 inode->i_generation = le16_to_cpu(rec->seq);
1622
1623 if (S_ISDIR(mode)) {
1624 inode->i_op = &ntfs_dir_inode_operations;
1625 inode->i_fop = &ntfs_dir_operations;
1626 } else if (S_ISLNK(mode)) {
1627 inode->i_op = &ntfs_link_inode_operations;
1628 inode->i_fop = NULL;
1629 inode->i_mapping->a_ops = &ntfs_aops;
1630 inode->i_size = size;
1631 inode_nohighmem(inode);
1632 } else if (S_ISREG(mode)) {
1633 inode->i_op = &ntfs_file_inode_operations;
1634 inode->i_fop = &ntfs_file_operations;
1635 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1636 &ntfs_aops;
1637 init_rwsem(&ni->file.run_lock);
1638 } else {
1639 inode->i_op = &ntfs_special_inode_operations;
1640 init_special_inode(inode, mode, dev);
1641 }
1642
1643 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1644 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1645 err = ntfs_init_acl(idmap, inode, dir);
1646 if (err)
1647 goto out5;
1648 } else
1649 #endif
1650 {
1651 inode->i_flags |= S_NOSEC;
1652 }
1653
1654 /*
1655 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1656 * The packed size of extended attribute is stored in direntry too.
1657 * 'fname' here points to inside new_de.
1658 */
1659 err = ntfs_save_wsl_perm(inode, &fname->dup.ea_size);
1660 if (err)
1661 goto out6;
1662
1663 /*
1664 * update ea_size in file_name attribute too.
1665 * Use ni_find_attr cause layout of MFT record may be changed
1666 * in ntfs_init_acl and ntfs_save_wsl_perm.
1667 */
1668 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
1669 if (attr) {
1670 struct ATTR_FILE_NAME *fn;
1671
1672 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1673 if (fn)
1674 fn->dup.ea_size = fname->dup.ea_size;
1675 }
1676
1677 /* We do not need to update parent directory later */
1678 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1679
1680 /* Step 2: Add new name in index. */
1681 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1682 if (err)
1683 goto out6;
1684
1685 /*
1686 * Call 'd_instantiate' after inode->i_op is set
1687 * but before finish_open.
1688 */
1689 d_instantiate(dentry, inode);
1690
1691 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1692 inode->i_atime = inode->i_mtime =
1693 inode_set_ctime_to_ts(inode, ni->i_crtime);
1694 dir->i_mtime = inode_set_ctime_to_ts(dir, ni->i_crtime);
1695
1696 mark_inode_dirty(dir);
1697 mark_inode_dirty(inode);
1698
1699 /* Normal exit. */
1700 goto out2;
1701
1702 out6:
1703 attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL);
1704 if (attr && attr->non_res) {
1705 /* Delete ATTR_EA, if non-resident. */
1706 struct runs_tree run;
1707 run_init(&run);
1708 attr_set_size(ni, ATTR_EA, NULL, 0, &run, 0, NULL, false, NULL);
1709 run_close(&run);
1710 }
1711
1712 if (rp_inserted)
1713 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1714
1715 out5:
1716 if (!S_ISDIR(mode))
1717 run_deallocate(sbi, &ni->file.run, false);
1718
1719 out4:
1720 clear_rec_inuse(rec);
1721 clear_nlink(inode);
1722 ni->mi.dirty = false;
1723 discard_new_inode(inode);
1724 out3:
1725 ntfs_mark_rec_free(sbi, ino, false);
1726
1727 out2:
1728 __putname(new_de);
1729 kfree(rp);
1730
1731 out1:
1732 if (!fnd)
1733 ni_unlock(dir_ni);
1734
1735 if (err)
1736 return ERR_PTR(err);
1737
1738 unlock_new_inode(inode);
1739
1740 return inode;
1741 }
1742
ntfs_link_inode(struct inode * inode,struct dentry * dentry)1743 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1744 {
1745 int err;
1746 struct ntfs_inode *ni = ntfs_i(inode);
1747 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1748 struct NTFS_DE *de;
1749
1750 /* Allocate PATH_MAX bytes. */
1751 de = __getname();
1752 if (!de)
1753 return -ENOMEM;
1754
1755 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1756 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1757
1758 /* Construct 'de'. */
1759 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1760 if (err)
1761 goto out;
1762
1763 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1764 out:
1765 __putname(de);
1766 return err;
1767 }
1768
1769 /*
1770 * ntfs_unlink_inode
1771 *
1772 * inode_operations::unlink
1773 * inode_operations::rmdir
1774 */
ntfs_unlink_inode(struct inode * dir,const struct dentry * dentry)1775 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1776 {
1777 int err;
1778 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1779 struct inode *inode = d_inode(dentry);
1780 struct ntfs_inode *ni = ntfs_i(inode);
1781 struct ntfs_inode *dir_ni = ntfs_i(dir);
1782 struct NTFS_DE *de, *de2 = NULL;
1783 int undo_remove;
1784
1785 if (ntfs_is_meta_file(sbi, ni->mi.rno))
1786 return -EINVAL;
1787
1788 /* Allocate PATH_MAX bytes. */
1789 de = __getname();
1790 if (!de)
1791 return -ENOMEM;
1792
1793 ni_lock(ni);
1794
1795 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1796 err = -ENOTEMPTY;
1797 goto out;
1798 }
1799
1800 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1801 if (err < 0)
1802 goto out;
1803
1804 undo_remove = 0;
1805 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1806
1807 if (!err) {
1808 drop_nlink(inode);
1809 dir->i_mtime = inode_set_ctime_current(dir);
1810 mark_inode_dirty(dir);
1811 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1812 if (inode->i_nlink)
1813 mark_inode_dirty(inode);
1814 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1815 _ntfs_bad_inode(inode);
1816 } else {
1817 if (ni_is_dirty(dir))
1818 mark_inode_dirty(dir);
1819 if (ni_is_dirty(inode))
1820 mark_inode_dirty(inode);
1821 }
1822
1823 out:
1824 ni_unlock(ni);
1825 __putname(de);
1826 return err;
1827 }
1828
ntfs_evict_inode(struct inode * inode)1829 void ntfs_evict_inode(struct inode *inode)
1830 {
1831 truncate_inode_pages_final(&inode->i_data);
1832
1833 invalidate_inode_buffers(inode);
1834 clear_inode(inode);
1835
1836 ni_clear(ntfs_i(inode));
1837 }
1838
1839 /*
1840 * ntfs_translate_junction
1841 *
1842 * Translate a Windows junction target to the Linux equivalent.
1843 * On junctions, targets are always absolute (they include the drive
1844 * letter). We have no way of knowing if the target is for the current
1845 * mounted device or not so we just assume it is.
1846 */
ntfs_translate_junction(const struct super_block * sb,const struct dentry * link_de,char * target,int target_len,int target_max)1847 static int ntfs_translate_junction(const struct super_block *sb,
1848 const struct dentry *link_de, char *target,
1849 int target_len, int target_max)
1850 {
1851 int tl_len, err = target_len;
1852 char *link_path_buffer = NULL, *link_path;
1853 char *translated = NULL;
1854 char *target_start;
1855 int copy_len;
1856
1857 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1858 if (!link_path_buffer) {
1859 err = -ENOMEM;
1860 goto out;
1861 }
1862 /* Get link path, relative to mount point */
1863 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1864 if (IS_ERR(link_path)) {
1865 ntfs_err(sb, "Error getting link path");
1866 err = -EINVAL;
1867 goto out;
1868 }
1869
1870 translated = kmalloc(PATH_MAX, GFP_NOFS);
1871 if (!translated) {
1872 err = -ENOMEM;
1873 goto out;
1874 }
1875
1876 /* Make translated path a relative path to mount point */
1877 strcpy(translated, "./");
1878 ++link_path; /* Skip leading / */
1879 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1880 if (*link_path == '/') {
1881 if (PATH_MAX - tl_len < sizeof("../")) {
1882 ntfs_err(sb,
1883 "Link path %s has too many components",
1884 link_path);
1885 err = -EINVAL;
1886 goto out;
1887 }
1888 strcpy(translated + tl_len, "../");
1889 tl_len += sizeof("../") - 1;
1890 }
1891 }
1892
1893 /* Skip drive letter */
1894 target_start = target;
1895 while (*target_start && *target_start != ':')
1896 ++target_start;
1897
1898 if (!*target_start) {
1899 ntfs_err(sb, "Link target (%s) missing drive separator",
1900 target);
1901 err = -EINVAL;
1902 goto out;
1903 }
1904
1905 /* Skip drive separator and leading /, if exists */
1906 target_start += 1 + (target_start[1] == '/');
1907 copy_len = target_len - (target_start - target);
1908
1909 if (PATH_MAX - tl_len <= copy_len) {
1910 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1911 target_start, PATH_MAX - tl_len, copy_len);
1912 err = -EINVAL;
1913 goto out;
1914 }
1915
1916 /* translated path has a trailing / and target_start does not */
1917 strcpy(translated + tl_len, target_start);
1918 tl_len += copy_len;
1919 if (target_max <= tl_len) {
1920 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1921 translated, target_max, tl_len);
1922 err = -EINVAL;
1923 goto out;
1924 }
1925 strcpy(target, translated);
1926 err = tl_len;
1927
1928 out:
1929 kfree(link_path_buffer);
1930 kfree(translated);
1931 return err;
1932 }
1933
ntfs_readlink_hlp(const struct dentry * link_de,struct inode * inode,char * buffer,int buflen)1934 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1935 struct inode *inode, char *buffer,
1936 int buflen)
1937 {
1938 int i, err = -EINVAL;
1939 struct ntfs_inode *ni = ntfs_i(inode);
1940 struct super_block *sb = inode->i_sb;
1941 struct ntfs_sb_info *sbi = sb->s_fs_info;
1942 u64 size;
1943 u16 ulen = 0;
1944 void *to_free = NULL;
1945 struct REPARSE_DATA_BUFFER *rp;
1946 const __le16 *uname;
1947 struct ATTRIB *attr;
1948
1949 /* Reparse data present. Try to parse it. */
1950 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1951 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1952
1953 *buffer = 0;
1954
1955 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1956 if (!attr)
1957 goto out;
1958
1959 if (!attr->non_res) {
1960 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1961 if (!rp)
1962 goto out;
1963 size = le32_to_cpu(attr->res.data_size);
1964 } else {
1965 size = le64_to_cpu(attr->nres.data_size);
1966 rp = NULL;
1967 }
1968
1969 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1970 goto out;
1971
1972 if (!rp) {
1973 rp = kmalloc(size, GFP_NOFS);
1974 if (!rp) {
1975 err = -ENOMEM;
1976 goto out;
1977 }
1978 to_free = rp;
1979 /* Read into temporal buffer. */
1980 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1981 if (err)
1982 goto out;
1983 }
1984
1985 /* Microsoft Tag. */
1986 switch (rp->ReparseTag) {
1987 case IO_REPARSE_TAG_MOUNT_POINT:
1988 /* Mount points and junctions. */
1989 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1990 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1991 MountPointReparseBuffer.PathBuffer))
1992 goto out;
1993 uname = Add2Ptr(rp,
1994 offsetof(struct REPARSE_DATA_BUFFER,
1995 MountPointReparseBuffer.PathBuffer) +
1996 le16_to_cpu(rp->MountPointReparseBuffer
1997 .PrintNameOffset));
1998 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1999 break;
2000
2001 case IO_REPARSE_TAG_SYMLINK:
2002 /* FolderSymbolicLink */
2003 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
2004 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
2005 SymbolicLinkReparseBuffer.PathBuffer))
2006 goto out;
2007 uname = Add2Ptr(
2008 rp, offsetof(struct REPARSE_DATA_BUFFER,
2009 SymbolicLinkReparseBuffer.PathBuffer) +
2010 le16_to_cpu(rp->SymbolicLinkReparseBuffer
2011 .PrintNameOffset));
2012 ulen = le16_to_cpu(
2013 rp->SymbolicLinkReparseBuffer.PrintNameLength);
2014 break;
2015
2016 case IO_REPARSE_TAG_CLOUD:
2017 case IO_REPARSE_TAG_CLOUD_1:
2018 case IO_REPARSE_TAG_CLOUD_2:
2019 case IO_REPARSE_TAG_CLOUD_3:
2020 case IO_REPARSE_TAG_CLOUD_4:
2021 case IO_REPARSE_TAG_CLOUD_5:
2022 case IO_REPARSE_TAG_CLOUD_6:
2023 case IO_REPARSE_TAG_CLOUD_7:
2024 case IO_REPARSE_TAG_CLOUD_8:
2025 case IO_REPARSE_TAG_CLOUD_9:
2026 case IO_REPARSE_TAG_CLOUD_A:
2027 case IO_REPARSE_TAG_CLOUD_B:
2028 case IO_REPARSE_TAG_CLOUD_C:
2029 case IO_REPARSE_TAG_CLOUD_D:
2030 case IO_REPARSE_TAG_CLOUD_E:
2031 case IO_REPARSE_TAG_CLOUD_F:
2032 err = sizeof("OneDrive") - 1;
2033 if (err > buflen)
2034 err = buflen;
2035 memcpy(buffer, "OneDrive", err);
2036 goto out;
2037
2038 default:
2039 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2040 /* Unknown Microsoft Tag. */
2041 goto out;
2042 }
2043 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2044 size <= sizeof(struct REPARSE_POINT)) {
2045 goto out;
2046 }
2047
2048 /* Users tag. */
2049 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2050 ulen = le16_to_cpu(rp->ReparseDataLength) -
2051 sizeof(struct REPARSE_POINT);
2052 }
2053
2054 /* Convert nlen from bytes to UNICODE chars. */
2055 ulen >>= 1;
2056
2057 /* Check that name is available. */
2058 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2059 goto out;
2060
2061 /* If name is already zero terminated then truncate it now. */
2062 if (!uname[ulen - 1])
2063 ulen -= 1;
2064
2065 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2066
2067 if (err < 0)
2068 goto out;
2069
2070 /* Translate Windows '\' into Linux '/'. */
2071 for (i = 0; i < err; i++) {
2072 if (buffer[i] == '\\')
2073 buffer[i] = '/';
2074 }
2075
2076 /* Always set last zero. */
2077 buffer[err] = 0;
2078
2079 /* If this is a junction, translate the link target. */
2080 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2081 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2082
2083 out:
2084 kfree(to_free);
2085 return err;
2086 }
2087
ntfs_get_link(struct dentry * de,struct inode * inode,struct delayed_call * done)2088 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2089 struct delayed_call *done)
2090 {
2091 int err;
2092 char *ret;
2093
2094 if (!de)
2095 return ERR_PTR(-ECHILD);
2096
2097 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2098 if (!ret)
2099 return ERR_PTR(-ENOMEM);
2100
2101 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2102 if (err < 0) {
2103 kfree(ret);
2104 return ERR_PTR(err);
2105 }
2106
2107 set_delayed_call(done, kfree_link, ret);
2108
2109 return ret;
2110 }
2111
2112 // clang-format off
2113 const struct inode_operations ntfs_link_inode_operations = {
2114 .get_link = ntfs_get_link,
2115 .setattr = ntfs3_setattr,
2116 .listxattr = ntfs_listxattr,
2117 };
2118
2119 const struct address_space_operations ntfs_aops = {
2120 .read_folio = ntfs_read_folio,
2121 .readahead = ntfs_readahead,
2122 .writepages = ntfs_writepages,
2123 .write_begin = ntfs_write_begin,
2124 .write_end = ntfs_write_end,
2125 .direct_IO = ntfs_direct_IO,
2126 .bmap = ntfs_bmap,
2127 .dirty_folio = block_dirty_folio,
2128 .migrate_folio = buffer_migrate_folio,
2129 .invalidate_folio = block_invalidate_folio,
2130 };
2131
2132 const struct address_space_operations ntfs_aops_cmpr = {
2133 .read_folio = ntfs_read_folio,
2134 .readahead = ntfs_readahead,
2135 .dirty_folio = block_dirty_folio,
2136 };
2137 // clang-format on
2138