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 if (is_compressed(ni)) {
809 ret = 0;
810 goto out;
811 }
812
813 ret = blockdev_direct_IO(iocb, inode, iter,
814 wr ? ntfs_get_block_direct_IO_W :
815 ntfs_get_block_direct_IO_R);
816
817 if (ret > 0)
818 end = vbo + ret;
819 else if (wr && ret == -EIOCBQUEUED)
820 end = vbo + iter_count;
821 else
822 goto out;
823
824 valid = ni->i_valid;
825 if (wr) {
826 if (end > valid && !S_ISBLK(inode->i_mode)) {
827 ni->i_valid = end;
828 mark_inode_dirty(inode);
829 }
830 } else if (vbo < valid && valid < end) {
831 /* Fix page. */
832 iov_iter_revert(iter, end - valid);
833 iov_iter_zero(end - valid, iter);
834 }
835
836 out:
837 return ret;
838 }
839
ntfs_set_size(struct inode * inode,u64 new_size)840 int ntfs_set_size(struct inode *inode, u64 new_size)
841 {
842 struct super_block *sb = inode->i_sb;
843 struct ntfs_sb_info *sbi = sb->s_fs_info;
844 struct ntfs_inode *ni = ntfs_i(inode);
845 int err;
846
847 /* Check for maximum file size. */
848 if (is_sparsed(ni) || is_compressed(ni)) {
849 if (new_size > sbi->maxbytes_sparse) {
850 err = -EFBIG;
851 goto out;
852 }
853 } else if (new_size > sbi->maxbytes) {
854 err = -EFBIG;
855 goto out;
856 }
857
858 ni_lock(ni);
859 down_write(&ni->file.run_lock);
860
861 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
862 &ni->i_valid, true, NULL);
863
864 up_write(&ni->file.run_lock);
865 ni_unlock(ni);
866
867 mark_inode_dirty(inode);
868
869 out:
870 return err;
871 }
872
ntfs_resident_writepage(struct folio * folio,struct writeback_control * wbc,void * data)873 static int ntfs_resident_writepage(struct folio *folio,
874 struct writeback_control *wbc, void *data)
875 {
876 struct address_space *mapping = data;
877 struct inode *inode = mapping->host;
878 struct ntfs_inode *ni = ntfs_i(inode);
879 int ret;
880
881 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
882 return -EIO;
883
884 ni_lock(ni);
885 ret = attr_data_write_resident(ni, folio);
886 ni_unlock(ni);
887
888 if (ret != E_NTFS_NONRESIDENT)
889 folio_unlock(folio);
890 mapping_set_error(mapping, ret);
891 return ret;
892 }
893
ntfs_writepages(struct address_space * mapping,struct writeback_control * wbc)894 static int ntfs_writepages(struct address_space *mapping,
895 struct writeback_control *wbc)
896 {
897 struct inode *inode = mapping->host;
898
899 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
900 return -EIO;
901
902 if (is_resident(ntfs_i(inode)))
903 return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
904 mapping);
905 return mpage_writepages(mapping, wbc, ntfs_get_block);
906 }
907
ntfs_get_block_write_begin(struct inode * inode,sector_t vbn,struct buffer_head * bh_result,int create)908 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
909 struct buffer_head *bh_result, int create)
910 {
911 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
912 bh_result, create, GET_BLOCK_WRITE_BEGIN);
913 }
914
ntfs_write_begin(struct file * file,struct address_space * mapping,loff_t pos,u32 len,struct folio ** foliop,void ** fsdata)915 int ntfs_write_begin(struct file *file, struct address_space *mapping,
916 loff_t pos, u32 len, struct folio **foliop, void **fsdata)
917 {
918 int err;
919 struct inode *inode = mapping->host;
920 struct ntfs_inode *ni = ntfs_i(inode);
921
922 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
923 return -EIO;
924
925 if (is_resident(ni)) {
926 struct folio *folio = __filemap_get_folio(
927 mapping, pos >> PAGE_SHIFT, FGP_WRITEBEGIN,
928 mapping_gfp_mask(mapping));
929
930 if (IS_ERR(folio)) {
931 err = PTR_ERR(folio);
932 goto out;
933 }
934
935 ni_lock(ni);
936 err = attr_data_read_resident(ni, folio);
937 ni_unlock(ni);
938
939 if (!err) {
940 *foliop = folio;
941 goto out;
942 }
943 folio_unlock(folio);
944 folio_put(folio);
945
946 if (err != E_NTFS_NONRESIDENT)
947 goto out;
948 }
949
950 err = block_write_begin(mapping, pos, len, foliop,
951 ntfs_get_block_write_begin);
952
953 out:
954 return err;
955 }
956
957 /*
958 * ntfs_write_end - Address_space_operations::write_end.
959 */
ntfs_write_end(struct file * file,struct address_space * mapping,loff_t pos,u32 len,u32 copied,struct folio * folio,void * fsdata)960 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
961 u32 len, u32 copied, struct folio *folio, void *fsdata)
962 {
963 struct inode *inode = mapping->host;
964 struct ntfs_inode *ni = ntfs_i(inode);
965 u64 valid = ni->i_valid;
966 bool dirty = false;
967 int err;
968
969 if (is_resident(ni)) {
970 ni_lock(ni);
971 err = attr_data_write_resident(ni, folio);
972 ni_unlock(ni);
973 if (!err) {
974 struct buffer_head *head = folio_buffers(folio);
975 dirty = true;
976 /* Clear any buffers in folio. */
977 if (head) {
978 struct buffer_head *bh = head;
979
980 do {
981 clear_buffer_dirty(bh);
982 clear_buffer_mapped(bh);
983 set_buffer_uptodate(bh);
984 } while (head != (bh = bh->b_this_page));
985 }
986 folio_mark_uptodate(folio);
987 err = copied;
988 }
989 folio_unlock(folio);
990 folio_put(folio);
991 } else {
992 err = generic_write_end(file, mapping, pos, len, copied, folio,
993 fsdata);
994 }
995
996 if (err >= 0) {
997 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
998 inode_set_mtime_to_ts(inode,
999 inode_set_ctime_current(inode));
1000 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
1001 dirty = true;
1002 }
1003
1004 if (valid != ni->i_valid) {
1005 /* ni->i_valid is changed in ntfs_get_block_vbo. */
1006 dirty = true;
1007 }
1008
1009 if (pos + err > inode->i_size) {
1010 i_size_write(inode, pos + err);
1011 dirty = true;
1012 }
1013
1014 if (dirty)
1015 mark_inode_dirty(inode);
1016 }
1017
1018 return err;
1019 }
1020
ntfs3_write_inode(struct inode * inode,struct writeback_control * wbc)1021 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1022 {
1023 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1024 }
1025
ntfs_sync_inode(struct inode * inode)1026 int ntfs_sync_inode(struct inode *inode)
1027 {
1028 return _ni_write_inode(inode, 1);
1029 }
1030
1031 /*
1032 * writeback_inode - Helper function for ntfs_flush_inodes().
1033 *
1034 * This writes both the inode and the file data blocks, waiting
1035 * for in flight data blocks before the start of the call. It
1036 * does not wait for any io started during the call.
1037 */
writeback_inode(struct inode * inode)1038 static int writeback_inode(struct inode *inode)
1039 {
1040 int ret = sync_inode_metadata(inode, 0);
1041
1042 if (!ret)
1043 ret = filemap_fdatawrite(inode->i_mapping);
1044 return ret;
1045 }
1046
1047 /*
1048 * ntfs_flush_inodes
1049 *
1050 * Write data and metadata corresponding to i1 and i2. The io is
1051 * started but we do not wait for any of it to finish.
1052 *
1053 * filemap_flush() is used for the block device, so if there is a dirty
1054 * page for a block already in flight, we will not wait and start the
1055 * io over again.
1056 */
ntfs_flush_inodes(struct super_block * sb,struct inode * i1,struct inode * i2)1057 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1058 struct inode *i2)
1059 {
1060 int ret = 0;
1061
1062 if (i1)
1063 ret = writeback_inode(i1);
1064 if (!ret && i2)
1065 ret = writeback_inode(i2);
1066 if (!ret)
1067 ret = filemap_flush(sb->s_bdev_file->f_mapping);
1068 return ret;
1069 }
1070
1071 /*
1072 * Helper function to read file.
1073 */
inode_read_data(struct inode * inode,void * data,size_t bytes)1074 int inode_read_data(struct inode *inode, void *data, size_t bytes)
1075 {
1076 pgoff_t idx;
1077 struct address_space *mapping = inode->i_mapping;
1078
1079 for (idx = 0; bytes; idx++) {
1080 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1081 struct page *page = read_mapping_page(mapping, idx, NULL);
1082 void *kaddr;
1083
1084 if (IS_ERR(page))
1085 return PTR_ERR(page);
1086
1087 kaddr = kmap_atomic(page);
1088 memcpy(data, kaddr, op);
1089 kunmap_atomic(kaddr);
1090
1091 put_page(page);
1092
1093 bytes -= op;
1094 data = Add2Ptr(data, PAGE_SIZE);
1095 }
1096 return 0;
1097 }
1098
1099 /*
1100 * ntfs_reparse_bytes
1101 *
1102 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1103 * for unicode string of @uni_len length.
1104 */
ntfs_reparse_bytes(u32 uni_len,bool is_absolute)1105 static inline u32 ntfs_reparse_bytes(u32 uni_len, bool is_absolute)
1106 {
1107 /* Header + unicode string + decorated unicode string. */
1108 return sizeof(short) * (2 * uni_len + (is_absolute ? 4 : 0)) +
1109 offsetof(struct REPARSE_DATA_BUFFER,
1110 SymbolicLinkReparseBuffer.PathBuffer);
1111 }
1112
1113 static struct REPARSE_DATA_BUFFER *
ntfs_create_reparse_buffer(struct ntfs_sb_info * sbi,const char * symname,u32 size,u16 * nsize)1114 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1115 u32 size, u16 *nsize)
1116 {
1117 int i, err;
1118 struct REPARSE_DATA_BUFFER *rp;
1119 __le16 *rp_name;
1120 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1121 bool is_absolute;
1122
1123 is_absolute = (strlen(symname) > 1 && symname[1] == ':');
1124
1125 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2, is_absolute), GFP_NOFS);
1126 if (!rp)
1127 return ERR_PTR(-ENOMEM);
1128
1129 rs = &rp->SymbolicLinkReparseBuffer;
1130 rp_name = rs->PathBuffer;
1131
1132 /* Convert link name to UTF-16. */
1133 err = ntfs_nls_to_utf16(sbi, symname, size,
1134 (struct cpu_str *)(rp_name - 1), 2 * size,
1135 UTF16_LITTLE_ENDIAN);
1136 if (err < 0)
1137 goto out;
1138
1139 /* err = the length of unicode name of symlink. */
1140 *nsize = ntfs_reparse_bytes(err, is_absolute);
1141
1142 if (*nsize > sbi->reparse.max_size) {
1143 err = -EFBIG;
1144 goto out;
1145 }
1146
1147 /* Translate Linux '/' into Windows '\'. */
1148 for (i = 0; i < err; i++) {
1149 if (rp_name[i] == cpu_to_le16('/'))
1150 rp_name[i] = cpu_to_le16('\\');
1151 }
1152
1153 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1154 rp->ReparseDataLength =
1155 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1156 SymbolicLinkReparseBuffer));
1157
1158 /* PrintName + SubstituteName. */
1159 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1160 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + (is_absolute ? 8 : 0));
1161 rs->PrintNameLength = rs->SubstituteNameOffset;
1162
1163 /*
1164 * TODO: Use relative path if possible to allow Windows to
1165 * parse this path.
1166 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1167 */
1168 rs->Flags = cpu_to_le32(is_absolute ? 0 : SYMLINK_FLAG_RELATIVE);
1169
1170 memmove(rp_name + err + (is_absolute ? 4 : 0), rp_name, sizeof(short) * err);
1171
1172 if (is_absolute) {
1173 /* Decorate SubstituteName. */
1174 rp_name += err;
1175 rp_name[0] = cpu_to_le16('\\');
1176 rp_name[1] = cpu_to_le16('?');
1177 rp_name[2] = cpu_to_le16('?');
1178 rp_name[3] = cpu_to_le16('\\');
1179 }
1180
1181 return rp;
1182 out:
1183 kfree(rp);
1184 return ERR_PTR(err);
1185 }
1186
1187 /*
1188 * ntfs_create_inode
1189 *
1190 * Helper function for:
1191 * - ntfs_create
1192 * - ntfs_mknod
1193 * - ntfs_symlink
1194 * - ntfs_mkdir
1195 * - ntfs_atomic_open
1196 *
1197 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1198 */
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)1199 int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1200 struct dentry *dentry, const struct cpu_str *uni,
1201 umode_t mode, dev_t dev, const char *symname, u32 size,
1202 struct ntfs_fnd *fnd)
1203 {
1204 int err;
1205 struct super_block *sb = dir->i_sb;
1206 struct ntfs_sb_info *sbi = sb->s_fs_info;
1207 const struct qstr *name = &dentry->d_name;
1208 CLST ino = 0;
1209 struct ntfs_inode *dir_ni = ntfs_i(dir);
1210 struct ntfs_inode *ni = NULL;
1211 struct inode *inode = NULL;
1212 struct ATTRIB *attr;
1213 struct ATTR_STD_INFO5 *std5;
1214 struct ATTR_FILE_NAME *fname;
1215 struct MFT_REC *rec;
1216 u32 asize, dsize, sd_size;
1217 enum FILE_ATTRIBUTE fa;
1218 __le32 security_id = SECURITY_ID_INVALID;
1219 CLST vcn;
1220 const void *sd;
1221 u16 t16, nsize = 0, aid = 0;
1222 struct INDEX_ROOT *root, *dir_root;
1223 struct NTFS_DE *e, *new_de = NULL;
1224 struct REPARSE_DATA_BUFFER *rp = NULL;
1225 bool rp_inserted = false;
1226
1227 /* New file will be resident or non resident. */
1228 const bool new_file_resident = 1;
1229
1230 if (!fnd)
1231 ni_lock_dir(dir_ni);
1232
1233 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1234 if (!dir_root) {
1235 err = -EINVAL;
1236 goto out1;
1237 }
1238
1239 if (S_ISDIR(mode)) {
1240 /* Use parent's directory attributes. */
1241 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1242 FILE_ATTRIBUTE_ARCHIVE;
1243 /*
1244 * By default child directory inherits parent attributes.
1245 * Root directory is hidden + system.
1246 * Make an exception for children in root.
1247 */
1248 if (dir->i_ino == MFT_REC_ROOT)
1249 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1250 } else if (S_ISLNK(mode)) {
1251 /* It is good idea that link should be the same type (file/dir) as target */
1252 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1253
1254 /*
1255 * Linux: there are dir/file/symlink and so on.
1256 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1257 * It is good idea to create:
1258 * dir + reparse if 'symname' points to directory
1259 * or
1260 * file + reparse if 'symname' points to file
1261 * Unfortunately kern_path hangs if symname contains 'dir'.
1262 */
1263
1264 /*
1265 * struct path path;
1266 *
1267 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1268 * struct inode *target = d_inode(path.dentry);
1269 *
1270 * if (S_ISDIR(target->i_mode))
1271 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1272 * // if ( target->i_sb == sb ){
1273 * // use relative path?
1274 * // }
1275 * path_put(&path);
1276 * }
1277 */
1278 } else if (S_ISREG(mode)) {
1279 if (sbi->options->sparse) {
1280 /* Sparsed regular file, cause option 'sparse'. */
1281 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1282 FILE_ATTRIBUTE_ARCHIVE;
1283 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1284 /* Compressed regular file, if parent is compressed. */
1285 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1286 } else {
1287 /* Regular file, default attributes. */
1288 fa = FILE_ATTRIBUTE_ARCHIVE;
1289 }
1290 } else {
1291 fa = FILE_ATTRIBUTE_ARCHIVE;
1292 }
1293
1294 /* If option "hide_dot_files" then set hidden attribute for dot files. */
1295 if (sbi->options->hide_dot_files && name->name[0] == '.')
1296 fa |= FILE_ATTRIBUTE_HIDDEN;
1297
1298 if (!(mode & 0222))
1299 fa |= FILE_ATTRIBUTE_READONLY;
1300
1301 /* Allocate PATH_MAX bytes. */
1302 new_de = __getname();
1303 if (!new_de) {
1304 err = -ENOMEM;
1305 goto out1;
1306 }
1307
1308 if (unlikely(ntfs3_forced_shutdown(sb))) {
1309 err = -EIO;
1310 goto out2;
1311 }
1312
1313 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1314 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1315
1316 /* Step 1: allocate and fill new mft record. */
1317 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1318 if (err)
1319 goto out2;
1320
1321 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1322 if (IS_ERR(ni)) {
1323 err = PTR_ERR(ni);
1324 ni = NULL;
1325 goto out3;
1326 }
1327 inode = &ni->vfs_inode;
1328 inode_init_owner(idmap, inode, dir, mode);
1329 mode = inode->i_mode;
1330
1331 ni->i_crtime = current_time(inode);
1332
1333 rec = ni->mi.mrec;
1334 rec->hard_links = cpu_to_le16(1);
1335 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1336
1337 /* Get default security id. */
1338 sd = s_default_security;
1339 sd_size = sizeof(s_default_security);
1340
1341 if (is_ntfs3(sbi)) {
1342 security_id = dir_ni->std_security_id;
1343 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1344 security_id = sbi->security.def_security_id;
1345
1346 if (security_id == SECURITY_ID_INVALID &&
1347 !ntfs_insert_security(sbi, sd, sd_size,
1348 &security_id, NULL))
1349 sbi->security.def_security_id = security_id;
1350 }
1351 }
1352
1353 /* Insert standard info. */
1354 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1355
1356 if (security_id == SECURITY_ID_INVALID) {
1357 dsize = sizeof(struct ATTR_STD_INFO);
1358 } else {
1359 dsize = sizeof(struct ATTR_STD_INFO5);
1360 std5->security_id = security_id;
1361 ni->std_security_id = security_id;
1362 }
1363 asize = SIZEOF_RESIDENT + dsize;
1364
1365 attr->type = ATTR_STD;
1366 attr->size = cpu_to_le32(asize);
1367 attr->id = cpu_to_le16(aid++);
1368 attr->res.data_off = SIZEOF_RESIDENT_LE;
1369 attr->res.data_size = cpu_to_le32(dsize);
1370
1371 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1372 kernel2nt(&ni->i_crtime);
1373
1374 std5->fa = ni->std_fa = fa;
1375
1376 attr = Add2Ptr(attr, asize);
1377
1378 /* Insert file name. */
1379 err = fill_name_de(sbi, new_de, name, uni);
1380 if (err)
1381 goto out4;
1382
1383 mi_get_ref(&ni->mi, &new_de->ref);
1384
1385 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1386
1387 if (sbi->options->windows_names &&
1388 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1389 err = -EINVAL;
1390 goto out4;
1391 }
1392
1393 mi_get_ref(&dir_ni->mi, &fname->home);
1394 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1395 fname->dup.a_time = std5->cr_time;
1396 fname->dup.alloc_size = fname->dup.data_size = 0;
1397 fname->dup.fa = std5->fa;
1398 fname->dup.ea_size = fname->dup.reparse = 0;
1399
1400 dsize = le16_to_cpu(new_de->key_size);
1401 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1402
1403 attr->type = ATTR_NAME;
1404 attr->size = cpu_to_le32(asize);
1405 attr->res.data_off = SIZEOF_RESIDENT_LE;
1406 attr->res.flags = RESIDENT_FLAG_INDEXED;
1407 attr->id = cpu_to_le16(aid++);
1408 attr->res.data_size = cpu_to_le32(dsize);
1409 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1410
1411 attr = Add2Ptr(attr, asize);
1412
1413 if (security_id == SECURITY_ID_INVALID) {
1414 /* Insert security attribute. */
1415 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1416
1417 attr->type = ATTR_SECURE;
1418 attr->size = cpu_to_le32(asize);
1419 attr->id = cpu_to_le16(aid++);
1420 attr->res.data_off = SIZEOF_RESIDENT_LE;
1421 attr->res.data_size = cpu_to_le32(sd_size);
1422 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1423
1424 attr = Add2Ptr(attr, asize);
1425 }
1426
1427 attr->id = cpu_to_le16(aid++);
1428 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1429 /*
1430 * Regular directory or symlink to directory.
1431 * Create root attribute.
1432 */
1433 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1434 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1435
1436 attr->type = ATTR_ROOT;
1437 attr->size = cpu_to_le32(asize);
1438
1439 attr->name_len = ARRAY_SIZE(I30_NAME);
1440 attr->name_off = SIZEOF_RESIDENT_LE;
1441 attr->res.data_off =
1442 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1443 attr->res.data_size = cpu_to_le32(dsize);
1444 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1445 sizeof(I30_NAME));
1446
1447 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1448 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1449 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1450 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1451 sizeof(struct NTFS_DE));
1452 root->ihdr.total = root->ihdr.used;
1453
1454 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1455 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1456 e->flags = NTFS_IE_LAST;
1457 } else if (S_ISLNK(mode)) {
1458 /*
1459 * Symlink to file.
1460 * Create empty resident data attribute.
1461 */
1462 asize = SIZEOF_RESIDENT;
1463
1464 /* Insert empty ATTR_DATA */
1465 attr->type = ATTR_DATA;
1466 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1467 attr->name_off = SIZEOF_RESIDENT_LE;
1468 attr->res.data_off = SIZEOF_RESIDENT_LE;
1469 } else if (!new_file_resident && S_ISREG(mode)) {
1470 /*
1471 * Regular file. Create empty non resident data attribute.
1472 */
1473 attr->type = ATTR_DATA;
1474 attr->non_res = 1;
1475 attr->nres.evcn = cpu_to_le64(-1ll);
1476 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1477 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1478 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1479 attr->flags = ATTR_FLAG_SPARSED;
1480 asize = SIZEOF_NONRESIDENT_EX + 8;
1481 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1482 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1483 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1484 attr->flags = ATTR_FLAG_COMPRESSED;
1485 attr->nres.c_unit = NTFS_LZNT_CUNIT;
1486 asize = SIZEOF_NONRESIDENT_EX + 8;
1487 } else {
1488 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1489 attr->name_off = SIZEOF_NONRESIDENT_LE;
1490 asize = SIZEOF_NONRESIDENT + 8;
1491 }
1492 attr->nres.run_off = attr->name_off;
1493 } else {
1494 /*
1495 * Node. Create empty resident data attribute.
1496 */
1497 attr->type = ATTR_DATA;
1498 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1499 attr->name_off = SIZEOF_RESIDENT_LE;
1500 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1501 attr->flags = ATTR_FLAG_SPARSED;
1502 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1503 attr->flags = ATTR_FLAG_COMPRESSED;
1504 attr->res.data_off = SIZEOF_RESIDENT_LE;
1505 asize = SIZEOF_RESIDENT;
1506 ni->ni_flags |= NI_FLAG_RESIDENT;
1507 }
1508
1509 if (S_ISDIR(mode)) {
1510 ni->ni_flags |= NI_FLAG_DIR;
1511 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1512 if (err)
1513 goto out4;
1514 } else if (S_ISLNK(mode)) {
1515 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1516
1517 if (IS_ERR(rp)) {
1518 err = PTR_ERR(rp);
1519 rp = NULL;
1520 goto out4;
1521 }
1522
1523 /*
1524 * Insert ATTR_REPARSE.
1525 */
1526 attr = Add2Ptr(attr, asize);
1527 attr->type = ATTR_REPARSE;
1528 attr->id = cpu_to_le16(aid++);
1529
1530 /* Resident or non resident? */
1531 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1532 t16 = PtrOffset(rec, attr);
1533
1534 /*
1535 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1536 * It is good idea to keep extended attributes resident.
1537 */
1538 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1539 CLST alen;
1540 CLST clst = bytes_to_cluster(sbi, nsize);
1541
1542 /* Bytes per runs. */
1543 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1544
1545 attr->non_res = 1;
1546 attr->nres.evcn = cpu_to_le64(clst - 1);
1547 attr->name_off = SIZEOF_NONRESIDENT_LE;
1548 attr->nres.run_off = attr->name_off;
1549 attr->nres.data_size = cpu_to_le64(nsize);
1550 attr->nres.valid_size = attr->nres.data_size;
1551 attr->nres.alloc_size =
1552 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1553
1554 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1555 clst, NULL, ALLOCATE_DEF,
1556 &alen, 0, NULL, NULL);
1557 if (err)
1558 goto out5;
1559
1560 err = run_pack(&ni->file.run, 0, clst,
1561 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1562 &vcn);
1563 if (err < 0)
1564 goto out5;
1565
1566 if (vcn != clst) {
1567 err = -EINVAL;
1568 goto out5;
1569 }
1570
1571 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1572 /* Write non resident data. */
1573 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1574 nsize, 0);
1575 if (err)
1576 goto out5;
1577 } else {
1578 attr->res.data_off = SIZEOF_RESIDENT_LE;
1579 attr->res.data_size = cpu_to_le32(nsize);
1580 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1581 }
1582 /* Size of symlink equals the length of input string. */
1583 inode->i_size = size;
1584
1585 attr->size = cpu_to_le32(asize);
1586
1587 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1588 &new_de->ref);
1589 if (err)
1590 goto out5;
1591
1592 rp_inserted = true;
1593 }
1594
1595 attr = Add2Ptr(attr, asize);
1596 attr->type = ATTR_END;
1597
1598 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1599 rec->next_attr_id = cpu_to_le16(aid);
1600
1601 inode->i_generation = le16_to_cpu(rec->seq);
1602
1603 if (S_ISDIR(mode)) {
1604 inode->i_op = &ntfs_dir_inode_operations;
1605 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1606 &ntfs_legacy_dir_operations :
1607 &ntfs_dir_operations;
1608 } else if (S_ISLNK(mode)) {
1609 inode->i_op = &ntfs_link_inode_operations;
1610 inode->i_fop = NULL;
1611 inode->i_mapping->a_ops = &ntfs_aops;
1612 inode->i_size = size;
1613 inode_nohighmem(inode);
1614 } else if (S_ISREG(mode)) {
1615 inode->i_op = &ntfs_file_inode_operations;
1616 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1617 &ntfs_legacy_file_operations :
1618 &ntfs_file_operations;
1619 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1620 &ntfs_aops;
1621 init_rwsem(&ni->file.run_lock);
1622 } else {
1623 inode->i_op = &ntfs_special_inode_operations;
1624 init_special_inode(inode, mode, dev);
1625 }
1626
1627 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1628 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1629 err = ntfs_init_acl(idmap, inode, dir);
1630 if (err)
1631 goto out5;
1632 } else
1633 #endif
1634 {
1635 inode->i_flags |= S_NOSEC;
1636 }
1637
1638 /*
1639 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1640 * The packed size of extended attribute is stored in direntry too.
1641 * 'fname' here points to inside new_de.
1642 */
1643 err = ntfs_save_wsl_perm(inode, &fname->dup.ea_size);
1644 if (err)
1645 goto out6;
1646
1647 /*
1648 * update ea_size in file_name attribute too.
1649 * Use ni_find_attr cause layout of MFT record may be changed
1650 * in ntfs_init_acl and ntfs_save_wsl_perm.
1651 */
1652 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
1653 if (attr) {
1654 struct ATTR_FILE_NAME *fn;
1655
1656 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1657 if (fn)
1658 fn->dup.ea_size = fname->dup.ea_size;
1659 }
1660
1661 /* We do not need to update parent directory later */
1662 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1663
1664 /* Step 2: Add new name in index. */
1665 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1666 if (err)
1667 goto out6;
1668
1669 /*
1670 * Call 'd_instantiate' after inode->i_op is set
1671 * but before finish_open.
1672 */
1673 d_instantiate(dentry, inode);
1674
1675 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1676 inode_set_atime_to_ts(inode, ni->i_crtime);
1677 inode_set_ctime_to_ts(inode, ni->i_crtime);
1678 inode_set_mtime_to_ts(inode, ni->i_crtime);
1679 inode_set_mtime_to_ts(dir, ni->i_crtime);
1680 inode_set_ctime_to_ts(dir, ni->i_crtime);
1681
1682 mark_inode_dirty(dir);
1683 mark_inode_dirty(inode);
1684
1685 /* Normal exit. */
1686 goto out2;
1687
1688 out6:
1689 attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL);
1690 if (attr && attr->non_res) {
1691 /* Delete ATTR_EA, if non-resident. */
1692 struct runs_tree run;
1693 run_init(&run);
1694 attr_set_size(ni, ATTR_EA, NULL, 0, &run, 0, NULL, false, NULL);
1695 run_close(&run);
1696 }
1697
1698 if (rp_inserted)
1699 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1700
1701 out5:
1702 if (!S_ISDIR(mode))
1703 run_deallocate(sbi, &ni->file.run, false);
1704
1705 out4:
1706 clear_rec_inuse(rec);
1707 clear_nlink(inode);
1708 ni->mi.dirty = false;
1709 discard_new_inode(inode);
1710 out3:
1711 ntfs_mark_rec_free(sbi, ino, false);
1712
1713 out2:
1714 __putname(new_de);
1715 kfree(rp);
1716
1717 out1:
1718 if (!fnd)
1719 ni_unlock(dir_ni);
1720
1721 if (!err)
1722 unlock_new_inode(inode);
1723
1724 return err;
1725 }
1726
ntfs_link_inode(struct inode * inode,struct dentry * dentry)1727 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1728 {
1729 int err;
1730 struct ntfs_inode *ni = ntfs_i(inode);
1731 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1732 struct NTFS_DE *de;
1733
1734 /* Allocate PATH_MAX bytes. */
1735 de = __getname();
1736 if (!de)
1737 return -ENOMEM;
1738
1739 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1740 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1741
1742 /* Construct 'de'. */
1743 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1744 if (err)
1745 goto out;
1746
1747 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1748 out:
1749 __putname(de);
1750 return err;
1751 }
1752
1753 /*
1754 * ntfs_unlink_inode
1755 *
1756 * inode_operations::unlink
1757 * inode_operations::rmdir
1758 */
ntfs_unlink_inode(struct inode * dir,const struct dentry * dentry)1759 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1760 {
1761 int err;
1762 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1763 struct inode *inode = d_inode(dentry);
1764 struct ntfs_inode *ni = ntfs_i(inode);
1765 struct ntfs_inode *dir_ni = ntfs_i(dir);
1766 struct NTFS_DE *de, *de2 = NULL;
1767 int undo_remove;
1768
1769 if (ntfs_is_meta_file(sbi, ni->mi.rno))
1770 return -EINVAL;
1771
1772 /* Allocate PATH_MAX bytes. */
1773 de = __getname();
1774 if (!de)
1775 return -ENOMEM;
1776
1777 ni_lock(ni);
1778
1779 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1780 err = -ENOTEMPTY;
1781 goto out;
1782 }
1783
1784 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1785 if (err < 0)
1786 goto out;
1787
1788 undo_remove = 0;
1789 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1790
1791 if (!err) {
1792 drop_nlink(inode);
1793 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1794 mark_inode_dirty(dir);
1795 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1796 if (inode->i_nlink)
1797 mark_inode_dirty(inode);
1798 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1799 _ntfs_bad_inode(inode);
1800 } else {
1801 if (ni_is_dirty(dir))
1802 mark_inode_dirty(dir);
1803 if (ni_is_dirty(inode))
1804 mark_inode_dirty(inode);
1805 }
1806
1807 out:
1808 ni_unlock(ni);
1809 __putname(de);
1810 return err;
1811 }
1812
ntfs_evict_inode(struct inode * inode)1813 void ntfs_evict_inode(struct inode *inode)
1814 {
1815 truncate_inode_pages_final(&inode->i_data);
1816
1817 invalidate_inode_buffers(inode);
1818 clear_inode(inode);
1819
1820 ni_clear(ntfs_i(inode));
1821 }
1822
1823 /*
1824 * ntfs_translate_junction
1825 *
1826 * Translate a Windows junction target to the Linux equivalent.
1827 * On junctions, targets are always absolute (they include the drive
1828 * letter). We have no way of knowing if the target is for the current
1829 * mounted device or not so we just assume it is.
1830 */
ntfs_translate_junction(const struct super_block * sb,const struct dentry * link_de,char * target,int target_len,int target_max)1831 static int ntfs_translate_junction(const struct super_block *sb,
1832 const struct dentry *link_de, char *target,
1833 int target_len, int target_max)
1834 {
1835 int tl_len, err = target_len;
1836 char *link_path_buffer = NULL, *link_path;
1837 char *translated = NULL;
1838 char *target_start;
1839 int copy_len;
1840
1841 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1842 if (!link_path_buffer) {
1843 err = -ENOMEM;
1844 goto out;
1845 }
1846 /* Get link path, relative to mount point */
1847 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1848 if (IS_ERR(link_path)) {
1849 ntfs_err(sb, "Error getting link path");
1850 err = -EINVAL;
1851 goto out;
1852 }
1853
1854 translated = kmalloc(PATH_MAX, GFP_NOFS);
1855 if (!translated) {
1856 err = -ENOMEM;
1857 goto out;
1858 }
1859
1860 /* Make translated path a relative path to mount point */
1861 strcpy(translated, "./");
1862 ++link_path; /* Skip leading / */
1863 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1864 if (*link_path == '/') {
1865 if (PATH_MAX - tl_len < sizeof("../")) {
1866 ntfs_err(sb,
1867 "Link path %s has too many components",
1868 link_path);
1869 err = -EINVAL;
1870 goto out;
1871 }
1872 strcpy(translated + tl_len, "../");
1873 tl_len += sizeof("../") - 1;
1874 }
1875 }
1876
1877 /* Skip drive letter */
1878 target_start = target;
1879 while (*target_start && *target_start != ':')
1880 ++target_start;
1881
1882 if (!*target_start) {
1883 ntfs_err(sb, "Link target (%s) missing drive separator",
1884 target);
1885 err = -EINVAL;
1886 goto out;
1887 }
1888
1889 /* Skip drive separator and leading /, if exists */
1890 target_start += 1 + (target_start[1] == '/');
1891 copy_len = target_len - (target_start - target);
1892
1893 if (PATH_MAX - tl_len <= copy_len) {
1894 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1895 target_start, PATH_MAX - tl_len, copy_len);
1896 err = -EINVAL;
1897 goto out;
1898 }
1899
1900 /* translated path has a trailing / and target_start does not */
1901 strcpy(translated + tl_len, target_start);
1902 tl_len += copy_len;
1903 if (target_max <= tl_len) {
1904 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1905 translated, target_max, tl_len);
1906 err = -EINVAL;
1907 goto out;
1908 }
1909 strcpy(target, translated);
1910 err = tl_len;
1911
1912 out:
1913 kfree(link_path_buffer);
1914 kfree(translated);
1915 return err;
1916 }
1917
ntfs_readlink_hlp(const struct dentry * link_de,struct inode * inode,char * buffer,int buflen)1918 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1919 struct inode *inode, char *buffer,
1920 int buflen)
1921 {
1922 int i, err = -EINVAL;
1923 struct ntfs_inode *ni = ntfs_i(inode);
1924 struct super_block *sb = inode->i_sb;
1925 struct ntfs_sb_info *sbi = sb->s_fs_info;
1926 u64 size;
1927 u16 ulen = 0;
1928 void *to_free = NULL;
1929 struct REPARSE_DATA_BUFFER *rp;
1930 const __le16 *uname;
1931 struct ATTRIB *attr;
1932
1933 /* Reparse data present. Try to parse it. */
1934 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1935 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1936
1937 *buffer = 0;
1938
1939 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1940 if (!attr)
1941 goto out;
1942
1943 if (!attr->non_res) {
1944 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1945 if (!rp)
1946 goto out;
1947 size = le32_to_cpu(attr->res.data_size);
1948 } else {
1949 size = le64_to_cpu(attr->nres.data_size);
1950 rp = NULL;
1951 }
1952
1953 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1954 goto out;
1955
1956 if (!rp) {
1957 rp = kmalloc(size, GFP_NOFS);
1958 if (!rp) {
1959 err = -ENOMEM;
1960 goto out;
1961 }
1962 to_free = rp;
1963 /* Read into temporal buffer. */
1964 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1965 if (err)
1966 goto out;
1967 }
1968
1969 /* Microsoft Tag. */
1970 switch (rp->ReparseTag) {
1971 case IO_REPARSE_TAG_MOUNT_POINT:
1972 /* Mount points and junctions. */
1973 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1974 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1975 MountPointReparseBuffer.PathBuffer))
1976 goto out;
1977 uname = Add2Ptr(rp,
1978 offsetof(struct REPARSE_DATA_BUFFER,
1979 MountPointReparseBuffer.PathBuffer) +
1980 le16_to_cpu(rp->MountPointReparseBuffer
1981 .PrintNameOffset));
1982 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1983 break;
1984
1985 case IO_REPARSE_TAG_SYMLINK:
1986 /* FolderSymbolicLink */
1987 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1988 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1989 SymbolicLinkReparseBuffer.PathBuffer))
1990 goto out;
1991 uname = Add2Ptr(
1992 rp, offsetof(struct REPARSE_DATA_BUFFER,
1993 SymbolicLinkReparseBuffer.PathBuffer) +
1994 le16_to_cpu(rp->SymbolicLinkReparseBuffer
1995 .PrintNameOffset));
1996 ulen = le16_to_cpu(
1997 rp->SymbolicLinkReparseBuffer.PrintNameLength);
1998 break;
1999
2000 case IO_REPARSE_TAG_CLOUD:
2001 case IO_REPARSE_TAG_CLOUD_1:
2002 case IO_REPARSE_TAG_CLOUD_2:
2003 case IO_REPARSE_TAG_CLOUD_3:
2004 case IO_REPARSE_TAG_CLOUD_4:
2005 case IO_REPARSE_TAG_CLOUD_5:
2006 case IO_REPARSE_TAG_CLOUD_6:
2007 case IO_REPARSE_TAG_CLOUD_7:
2008 case IO_REPARSE_TAG_CLOUD_8:
2009 case IO_REPARSE_TAG_CLOUD_9:
2010 case IO_REPARSE_TAG_CLOUD_A:
2011 case IO_REPARSE_TAG_CLOUD_B:
2012 case IO_REPARSE_TAG_CLOUD_C:
2013 case IO_REPARSE_TAG_CLOUD_D:
2014 case IO_REPARSE_TAG_CLOUD_E:
2015 case IO_REPARSE_TAG_CLOUD_F:
2016 err = sizeof("OneDrive") - 1;
2017 if (err > buflen)
2018 err = buflen;
2019 memcpy(buffer, "OneDrive", err);
2020 goto out;
2021
2022 default:
2023 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2024 /* Unknown Microsoft Tag. */
2025 goto out;
2026 }
2027 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2028 size <= sizeof(struct REPARSE_POINT)) {
2029 goto out;
2030 }
2031
2032 /* Users tag. */
2033 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2034 ulen = le16_to_cpu(rp->ReparseDataLength) -
2035 sizeof(struct REPARSE_POINT);
2036 }
2037
2038 /* Convert nlen from bytes to UNICODE chars. */
2039 ulen >>= 1;
2040
2041 /* Check that name is available. */
2042 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2043 goto out;
2044
2045 /* If name is already zero terminated then truncate it now. */
2046 if (!uname[ulen - 1])
2047 ulen -= 1;
2048
2049 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2050
2051 if (err < 0)
2052 goto out;
2053
2054 /* Translate Windows '\' into Linux '/'. */
2055 for (i = 0; i < err; i++) {
2056 if (buffer[i] == '\\')
2057 buffer[i] = '/';
2058 }
2059
2060 /* Always set last zero. */
2061 buffer[err] = 0;
2062
2063 /* If this is a junction, translate the link target. */
2064 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2065 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2066
2067 out:
2068 kfree(to_free);
2069 return err;
2070 }
2071
ntfs_get_link(struct dentry * de,struct inode * inode,struct delayed_call * done)2072 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2073 struct delayed_call *done)
2074 {
2075 int err;
2076 char *ret;
2077
2078 if (!de)
2079 return ERR_PTR(-ECHILD);
2080
2081 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2082 if (!ret)
2083 return ERR_PTR(-ENOMEM);
2084
2085 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2086 if (err < 0) {
2087 kfree(ret);
2088 return ERR_PTR(err);
2089 }
2090
2091 set_delayed_call(done, kfree_link, ret);
2092
2093 return ret;
2094 }
2095
2096 // clang-format off
2097 const struct inode_operations ntfs_link_inode_operations = {
2098 .get_link = ntfs_get_link,
2099 .setattr = ntfs_setattr,
2100 .listxattr = ntfs_listxattr,
2101 };
2102
2103 const struct address_space_operations ntfs_aops = {
2104 .read_folio = ntfs_read_folio,
2105 .readahead = ntfs_readahead,
2106 .writepages = ntfs_writepages,
2107 .write_begin = ntfs_write_begin,
2108 .write_end = ntfs_write_end,
2109 .direct_IO = ntfs_direct_IO,
2110 .bmap = ntfs_bmap,
2111 .dirty_folio = block_dirty_folio,
2112 .migrate_folio = buffer_migrate_folio,
2113 .invalidate_folio = block_invalidate_folio,
2114 };
2115
2116 const struct address_space_operations ntfs_aops_cmpr = {
2117 .read_folio = ntfs_read_folio,
2118 .readahead = ntfs_readahead,
2119 .dirty_folio = block_dirty_folio,
2120 .direct_IO = ntfs_direct_IO,
2121 };
2122 // clang-format on
2123