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Merge tag 'block-6.1-2022-11-25' of git://git.kernel.dk/linux
[mirror_ubuntu-kernels.git] / fs / ntfs3 / inode.c
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 */
23 static struct inode *ntfs_read_mft(struct inode *inode,
24 const struct cpu_str *name,
25 const struct MFT_REF *ref)
26 {
27 int err = 0;
28 struct ntfs_inode *ni = ntfs_i(inode);
29 struct super_block *sb = inode->i_sb;
30 struct ntfs_sb_info *sbi = sb->s_fs_info;
31 mode_t mode = 0;
32 struct ATTR_STD_INFO5 *std5 = NULL;
33 struct ATTR_LIST_ENTRY *le;
34 struct ATTRIB *attr;
35 bool is_match = false;
36 bool is_root = false;
37 bool is_dir;
38 unsigned long ino = inode->i_ino;
39 u32 rp_fa = 0, asize, t32;
40 u16 roff, rsize, names = 0;
41 const struct ATTR_FILE_NAME *fname = NULL;
42 const struct INDEX_ROOT *root;
43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
44 u64 t64;
45 struct MFT_REC *rec;
46 struct runs_tree *run;
47
48 inode->i_op = NULL;
49 /* Setup 'uid' and 'gid' */
50 inode->i_uid = sbi->options->fs_uid;
51 inode->i_gid = sbi->options->fs_gid;
52
53 err = mi_init(&ni->mi, sbi, ino);
54 if (err)
55 goto out;
56
57 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
58 t64 = sbi->mft.lbo >> sbi->cluster_bits;
59 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
60 sbi->mft.ni = ni;
61 init_rwsem(&ni->file.run_lock);
62
63 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
64 err = -ENOMEM;
65 goto out;
66 }
67 }
68
69 err = mi_read(&ni->mi, ino == MFT_REC_MFT);
70
71 if (err)
72 goto out;
73
74 rec = ni->mi.mrec;
75
76 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
77 ;
78 } else if (ref->seq != rec->seq) {
79 err = -EINVAL;
80 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
81 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
82 goto out;
83 } else if (!is_rec_inuse(rec)) {
84 err = -EINVAL;
85 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
86 goto out;
87 }
88
89 if (le32_to_cpu(rec->total) != sbi->record_size) {
90 /* Bad inode? */
91 err = -EINVAL;
92 goto out;
93 }
94
95 if (!is_rec_base(rec))
96 goto Ok;
97
98 /* Record should contain $I30 root. */
99 is_dir = rec->flags & RECORD_FLAG_DIR;
100
101 inode->i_generation = le16_to_cpu(rec->seq);
102
103 /* Enumerate all struct Attributes MFT. */
104 le = NULL;
105 attr = NULL;
106
107 /*
108 * To reduce tab pressure use goto instead of
109 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
110 */
111 next_attr:
112 run = NULL;
113 err = -EINVAL;
114 attr = ni_enum_attr_ex(ni, attr, &le, NULL);
115 if (!attr)
116 goto end_enum;
117
118 if (le && le->vcn) {
119 /* This is non primary attribute segment. Ignore if not MFT. */
120 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
121 goto next_attr;
122
123 run = &ni->file.run;
124 asize = le32_to_cpu(attr->size);
125 goto attr_unpack_run;
126 }
127
128 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
129 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
130 asize = le32_to_cpu(attr->size);
131
132 switch (attr->type) {
133 case ATTR_STD:
134 if (attr->non_res ||
135 asize < sizeof(struct ATTR_STD_INFO) + roff ||
136 rsize < sizeof(struct ATTR_STD_INFO))
137 goto out;
138
139 if (std5)
140 goto next_attr;
141
142 std5 = Add2Ptr(attr, roff);
143
144 #ifdef STATX_BTIME
145 nt2kernel(std5->cr_time, &ni->i_crtime);
146 #endif
147 nt2kernel(std5->a_time, &inode->i_atime);
148 nt2kernel(std5->c_time, &inode->i_ctime);
149 nt2kernel(std5->m_time, &inode->i_mtime);
150
151 ni->std_fa = std5->fa;
152
153 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
154 rsize >= sizeof(struct ATTR_STD_INFO5))
155 ni->std_security_id = std5->security_id;
156 goto next_attr;
157
158 case ATTR_LIST:
159 if (attr->name_len || le || ino == MFT_REC_LOG)
160 goto out;
161
162 err = ntfs_load_attr_list(ni, attr);
163 if (err)
164 goto out;
165
166 le = NULL;
167 attr = NULL;
168 goto next_attr;
169
170 case ATTR_NAME:
171 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
172 rsize < SIZEOF_ATTRIBUTE_FILENAME)
173 goto out;
174
175 fname = Add2Ptr(attr, roff);
176 if (fname->type == FILE_NAME_DOS)
177 goto next_attr;
178
179 names += 1;
180 if (name && name->len == fname->name_len &&
181 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
182 NULL, false))
183 is_match = true;
184
185 goto next_attr;
186
187 case ATTR_DATA:
188 if (is_dir) {
189 /* Ignore data attribute in dir record. */
190 goto next_attr;
191 }
192
193 if (ino == MFT_REC_BADCLUST && !attr->non_res)
194 goto next_attr;
195
196 if (attr->name_len &&
197 ((ino != MFT_REC_BADCLUST || !attr->non_res ||
198 attr->name_len != ARRAY_SIZE(BAD_NAME) ||
199 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
200 (ino != MFT_REC_SECURE || !attr->non_res ||
201 attr->name_len != ARRAY_SIZE(SDS_NAME) ||
202 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
203 /* File contains stream attribute. Ignore it. */
204 goto next_attr;
205 }
206
207 if (is_attr_sparsed(attr))
208 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
209 else
210 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
211
212 if (is_attr_compressed(attr))
213 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
214 else
215 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
216
217 if (is_attr_encrypted(attr))
218 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
219 else
220 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
221
222 if (!attr->non_res) {
223 ni->i_valid = inode->i_size = rsize;
224 inode_set_bytes(inode, rsize);
225 }
226
227 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
228
229 if (!attr->non_res) {
230 ni->ni_flags |= NI_FLAG_RESIDENT;
231 goto next_attr;
232 }
233
234 inode_set_bytes(inode, attr_ondisk_size(attr));
235
236 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
237 inode->i_size = le64_to_cpu(attr->nres.data_size);
238 if (!attr->nres.alloc_size)
239 goto next_attr;
240
241 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run
242 : &ni->file.run;
243 break;
244
245 case ATTR_ROOT:
246 if (attr->non_res)
247 goto out;
248
249 root = Add2Ptr(attr, roff);
250 is_root = true;
251
252 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
253 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
254 goto next_attr;
255
256 if (root->type != ATTR_NAME ||
257 root->rule != NTFS_COLLATION_TYPE_FILENAME)
258 goto out;
259
260 if (!is_dir)
261 goto next_attr;
262
263 ni->ni_flags |= NI_FLAG_DIR;
264
265 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
266 if (err)
267 goto out;
268
269 mode = sb->s_root
270 ? (S_IFDIR | (0777 & sbi->options->fs_dmask_inv))
271 : (S_IFDIR | 0777);
272 goto next_attr;
273
274 case ATTR_ALLOC:
275 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
276 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
277 goto next_attr;
278
279 inode->i_size = le64_to_cpu(attr->nres.data_size);
280 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
281 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
282
283 run = &ni->dir.alloc_run;
284 break;
285
286 case ATTR_BITMAP:
287 if (ino == MFT_REC_MFT) {
288 if (!attr->non_res)
289 goto out;
290 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
291 /* 0x20000000 = 2^32 / 8 */
292 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
293 goto out;
294 #endif
295 run = &sbi->mft.bitmap.run;
296 break;
297 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
298 !memcmp(attr_name(attr), I30_NAME,
299 sizeof(I30_NAME)) &&
300 attr->non_res) {
301 run = &ni->dir.bitmap_run;
302 break;
303 }
304 goto next_attr;
305
306 case ATTR_REPARSE:
307 if (attr->name_len)
308 goto next_attr;
309
310 rp_fa = ni_parse_reparse(ni, attr, &rp);
311 switch (rp_fa) {
312 case REPARSE_LINK:
313 /*
314 * Normal symlink.
315 * Assume one unicode symbol == one utf8.
316 */
317 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
318 .PrintNameLength) /
319 sizeof(u16);
320
321 ni->i_valid = inode->i_size;
322
323 /* Clear directory bit. */
324 if (ni->ni_flags & NI_FLAG_DIR) {
325 indx_clear(&ni->dir);
326 memset(&ni->dir, 0, sizeof(ni->dir));
327 ni->ni_flags &= ~NI_FLAG_DIR;
328 } else {
329 run_close(&ni->file.run);
330 }
331 mode = S_IFLNK | 0777;
332 is_dir = false;
333 if (attr->non_res) {
334 run = &ni->file.run;
335 goto attr_unpack_run; // Double break.
336 }
337 break;
338
339 case REPARSE_COMPRESSED:
340 break;
341
342 case REPARSE_DEDUPLICATED:
343 break;
344 }
345 goto next_attr;
346
347 case ATTR_EA_INFO:
348 if (!attr->name_len &&
349 resident_data_ex(attr, sizeof(struct EA_INFO))) {
350 ni->ni_flags |= NI_FLAG_EA;
351 /*
352 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
353 */
354 inode->i_mode = mode;
355 ntfs_get_wsl_perm(inode);
356 mode = inode->i_mode;
357 }
358 goto next_attr;
359
360 default:
361 goto next_attr;
362 }
363
364 attr_unpack_run:
365 roff = le16_to_cpu(attr->nres.run_off);
366
367 t64 = le64_to_cpu(attr->nres.svcn);
368 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
369 t64, Add2Ptr(attr, roff), asize - roff);
370 if (err < 0)
371 goto out;
372 err = 0;
373 goto next_attr;
374
375 end_enum:
376
377 if (!std5)
378 goto out;
379
380 if (!is_match && name) {
381 /* Reuse rec as buffer for ascii name. */
382 err = -ENOENT;
383 goto out;
384 }
385
386 if (std5->fa & FILE_ATTRIBUTE_READONLY)
387 mode &= ~0222;
388
389 if (!names) {
390 err = -EINVAL;
391 goto out;
392 }
393
394 if (names != le16_to_cpu(rec->hard_links)) {
395 /* Correct minor error on the fly. Do not mark inode as dirty. */
396 rec->hard_links = cpu_to_le16(names);
397 ni->mi.dirty = true;
398 }
399
400 set_nlink(inode, names);
401
402 if (S_ISDIR(mode)) {
403 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
404
405 /*
406 * Dot and dot-dot should be included in count but was not
407 * included in enumeration.
408 * Usually a hard links to directories are disabled.
409 */
410 inode->i_op = &ntfs_dir_inode_operations;
411 inode->i_fop = &ntfs_dir_operations;
412 ni->i_valid = 0;
413 } else if (S_ISLNK(mode)) {
414 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
415 inode->i_op = &ntfs_link_inode_operations;
416 inode->i_fop = NULL;
417 inode_nohighmem(inode);
418 } else if (S_ISREG(mode)) {
419 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
420 inode->i_op = &ntfs_file_inode_operations;
421 inode->i_fop = &ntfs_file_operations;
422 inode->i_mapping->a_ops =
423 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
424 if (ino != MFT_REC_MFT)
425 init_rwsem(&ni->file.run_lock);
426 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
427 S_ISSOCK(mode)) {
428 inode->i_op = &ntfs_special_inode_operations;
429 init_special_inode(inode, mode, inode->i_rdev);
430 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
431 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
432 /* Records in $Extend are not a files or general directories. */
433 inode->i_op = &ntfs_file_inode_operations;
434 } else {
435 err = -EINVAL;
436 goto out;
437 }
438
439 if ((sbi->options->sys_immutable &&
440 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
441 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
442 inode->i_flags |= S_IMMUTABLE;
443 } else {
444 inode->i_flags &= ~S_IMMUTABLE;
445 }
446
447 inode->i_mode = mode;
448 if (!(ni->ni_flags & NI_FLAG_EA)) {
449 /* If no xattr then no security (stored in xattr). */
450 inode->i_flags |= S_NOSEC;
451 }
452
453 Ok:
454 if (ino == MFT_REC_MFT && !sb->s_root)
455 sbi->mft.ni = NULL;
456
457 unlock_new_inode(inode);
458
459 return inode;
460
461 out:
462 if (ino == MFT_REC_MFT && !sb->s_root)
463 sbi->mft.ni = NULL;
464
465 iget_failed(inode);
466 return ERR_PTR(err);
467 }
468
469 /*
470 * ntfs_test_inode
471 *
472 * Return: 1 if match.
473 */
474 static int ntfs_test_inode(struct inode *inode, void *data)
475 {
476 struct MFT_REF *ref = data;
477
478 return ino_get(ref) == inode->i_ino;
479 }
480
481 static int ntfs_set_inode(struct inode *inode, void *data)
482 {
483 const struct MFT_REF *ref = data;
484
485 inode->i_ino = ino_get(ref);
486 return 0;
487 }
488
489 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
490 const struct cpu_str *name)
491 {
492 struct inode *inode;
493
494 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
495 (void *)ref);
496 if (unlikely(!inode))
497 return ERR_PTR(-ENOMEM);
498
499 /* If this is a freshly allocated inode, need to read it now. */
500 if (inode->i_state & I_NEW)
501 inode = ntfs_read_mft(inode, name, ref);
502 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
503 /* Inode overlaps? */
504 _ntfs_bad_inode(inode);
505 }
506
507 return inode;
508 }
509
510 enum get_block_ctx {
511 GET_BLOCK_GENERAL = 0,
512 GET_BLOCK_WRITE_BEGIN = 1,
513 GET_BLOCK_DIRECT_IO_R = 2,
514 GET_BLOCK_DIRECT_IO_W = 3,
515 GET_BLOCK_BMAP = 4,
516 };
517
518 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
519 struct buffer_head *bh, int create,
520 enum get_block_ctx ctx)
521 {
522 struct super_block *sb = inode->i_sb;
523 struct ntfs_sb_info *sbi = sb->s_fs_info;
524 struct ntfs_inode *ni = ntfs_i(inode);
525 struct page *page = bh->b_page;
526 u8 cluster_bits = sbi->cluster_bits;
527 u32 block_size = sb->s_blocksize;
528 u64 bytes, lbo, valid;
529 u32 off;
530 int err;
531 CLST vcn, lcn, len;
532 bool new;
533
534 /* Clear previous state. */
535 clear_buffer_new(bh);
536 clear_buffer_uptodate(bh);
537
538 /* Direct write uses 'create=0'. */
539 if (!create && vbo >= ni->i_valid) {
540 /* Out of valid. */
541 return 0;
542 }
543
544 if (vbo >= inode->i_size) {
545 /* Out of size. */
546 return 0;
547 }
548
549 if (is_resident(ni)) {
550 ni_lock(ni);
551 err = attr_data_read_resident(ni, page);
552 ni_unlock(ni);
553
554 if (!err)
555 set_buffer_uptodate(bh);
556 bh->b_size = block_size;
557 return err;
558 }
559
560 vcn = vbo >> cluster_bits;
561 off = vbo & sbi->cluster_mask;
562 new = false;
563
564 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL);
565 if (err)
566 goto out;
567
568 if (!len)
569 return 0;
570
571 bytes = ((u64)len << cluster_bits) - off;
572
573 if (lcn == SPARSE_LCN) {
574 if (!create) {
575 if (bh->b_size > bytes)
576 bh->b_size = bytes;
577 return 0;
578 }
579 WARN_ON(1);
580 }
581
582 if (new) {
583 set_buffer_new(bh);
584 if ((len << cluster_bits) > block_size)
585 ntfs_sparse_cluster(inode, page, vcn, len);
586 }
587
588 lbo = ((u64)lcn << cluster_bits) + off;
589
590 set_buffer_mapped(bh);
591 bh->b_bdev = sb->s_bdev;
592 bh->b_blocknr = lbo >> sb->s_blocksize_bits;
593
594 valid = ni->i_valid;
595
596 if (ctx == GET_BLOCK_DIRECT_IO_W) {
597 /* ntfs_direct_IO will update ni->i_valid. */
598 if (vbo >= valid)
599 set_buffer_new(bh);
600 } else if (create) {
601 /* Normal write. */
602 if (bytes > bh->b_size)
603 bytes = bh->b_size;
604
605 if (vbo >= valid)
606 set_buffer_new(bh);
607
608 if (vbo + bytes > valid) {
609 ni->i_valid = vbo + bytes;
610 mark_inode_dirty(inode);
611 }
612 } else if (vbo >= valid) {
613 /* Read out of valid data. */
614 /* Should never be here 'cause already checked. */
615 clear_buffer_mapped(bh);
616 } else if (vbo + bytes <= valid) {
617 /* Normal read. */
618 } else if (vbo + block_size <= valid) {
619 /* Normal short read. */
620 bytes = block_size;
621 } else {
622 /*
623 * Read across valid size: vbo < valid && valid < vbo + block_size
624 */
625 bytes = block_size;
626
627 if (page) {
628 u32 voff = valid - vbo;
629
630 bh->b_size = block_size;
631 off = vbo & (PAGE_SIZE - 1);
632 set_bh_page(bh, page, off);
633 err = bh_read(bh, 0);
634 if (err < 0)
635 goto out;
636 zero_user_segment(page, off + voff, off + block_size);
637 }
638 }
639
640 if (bh->b_size > bytes)
641 bh->b_size = bytes;
642
643 #ifndef __LP64__
644 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
645 static_assert(sizeof(size_t) < sizeof(loff_t));
646 if (bytes > 0x40000000u)
647 bh->b_size = 0x40000000u;
648 }
649 #endif
650
651 return 0;
652
653 out:
654 return err;
655 }
656
657 int ntfs_get_block(struct inode *inode, sector_t vbn,
658 struct buffer_head *bh_result, int create)
659 {
660 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
661 bh_result, create, GET_BLOCK_GENERAL);
662 }
663
664 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
665 struct buffer_head *bh_result, int create)
666 {
667 return ntfs_get_block_vbo(inode,
668 (u64)vsn << inode->i_sb->s_blocksize_bits,
669 bh_result, create, GET_BLOCK_BMAP);
670 }
671
672 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
673 {
674 return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
675 }
676
677 static int ntfs_read_folio(struct file *file, struct folio *folio)
678 {
679 struct page *page = &folio->page;
680 int err;
681 struct address_space *mapping = page->mapping;
682 struct inode *inode = mapping->host;
683 struct ntfs_inode *ni = ntfs_i(inode);
684
685 if (is_resident(ni)) {
686 ni_lock(ni);
687 err = attr_data_read_resident(ni, page);
688 ni_unlock(ni);
689 if (err != E_NTFS_NONRESIDENT) {
690 unlock_page(page);
691 return err;
692 }
693 }
694
695 if (is_compressed(ni)) {
696 ni_lock(ni);
697 err = ni_readpage_cmpr(ni, page);
698 ni_unlock(ni);
699 return err;
700 }
701
702 /* Normal + sparse files. */
703 return mpage_read_folio(folio, ntfs_get_block);
704 }
705
706 static void ntfs_readahead(struct readahead_control *rac)
707 {
708 struct address_space *mapping = rac->mapping;
709 struct inode *inode = mapping->host;
710 struct ntfs_inode *ni = ntfs_i(inode);
711 u64 valid;
712 loff_t pos;
713
714 if (is_resident(ni)) {
715 /* No readahead for resident. */
716 return;
717 }
718
719 if (is_compressed(ni)) {
720 /* No readahead for compressed. */
721 return;
722 }
723
724 valid = ni->i_valid;
725 pos = readahead_pos(rac);
726
727 if (valid < i_size_read(inode) && pos <= valid &&
728 valid < pos + readahead_length(rac)) {
729 /* Range cross 'valid'. Read it page by page. */
730 return;
731 }
732
733 mpage_readahead(rac, ntfs_get_block);
734 }
735
736 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
737 struct buffer_head *bh_result, int create)
738 {
739 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
740 bh_result, create, GET_BLOCK_DIRECT_IO_R);
741 }
742
743 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
744 struct buffer_head *bh_result, int create)
745 {
746 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
747 bh_result, create, GET_BLOCK_DIRECT_IO_W);
748 }
749
750 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
751 {
752 struct file *file = iocb->ki_filp;
753 struct address_space *mapping = file->f_mapping;
754 struct inode *inode = mapping->host;
755 struct ntfs_inode *ni = ntfs_i(inode);
756 loff_t vbo = iocb->ki_pos;
757 loff_t end;
758 int wr = iov_iter_rw(iter) & WRITE;
759 size_t iter_count = iov_iter_count(iter);
760 loff_t valid;
761 ssize_t ret;
762
763 if (is_resident(ni)) {
764 /* Switch to buffered write. */
765 ret = 0;
766 goto out;
767 }
768
769 ret = blockdev_direct_IO(iocb, inode, iter,
770 wr ? ntfs_get_block_direct_IO_W
771 : ntfs_get_block_direct_IO_R);
772
773 if (ret > 0)
774 end = vbo + ret;
775 else if (wr && ret == -EIOCBQUEUED)
776 end = vbo + iter_count;
777 else
778 goto out;
779
780 valid = ni->i_valid;
781 if (wr) {
782 if (end > valid && !S_ISBLK(inode->i_mode)) {
783 ni->i_valid = end;
784 mark_inode_dirty(inode);
785 }
786 } else if (vbo < valid && valid < end) {
787 /* Fix page. */
788 iov_iter_revert(iter, end - valid);
789 iov_iter_zero(end - valid, iter);
790 }
791
792 out:
793 return ret;
794 }
795
796 int ntfs_set_size(struct inode *inode, u64 new_size)
797 {
798 struct super_block *sb = inode->i_sb;
799 struct ntfs_sb_info *sbi = sb->s_fs_info;
800 struct ntfs_inode *ni = ntfs_i(inode);
801 int err;
802
803 /* Check for maximum file size. */
804 if (is_sparsed(ni) || is_compressed(ni)) {
805 if (new_size > sbi->maxbytes_sparse) {
806 err = -EFBIG;
807 goto out;
808 }
809 } else if (new_size > sbi->maxbytes) {
810 err = -EFBIG;
811 goto out;
812 }
813
814 ni_lock(ni);
815 down_write(&ni->file.run_lock);
816
817 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
818 &ni->i_valid, true, NULL);
819
820 up_write(&ni->file.run_lock);
821 ni_unlock(ni);
822
823 mark_inode_dirty(inode);
824
825 out:
826 return err;
827 }
828
829 static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
830 {
831 struct address_space *mapping = page->mapping;
832 struct inode *inode = mapping->host;
833 struct ntfs_inode *ni = ntfs_i(inode);
834 int err;
835
836 if (is_resident(ni)) {
837 ni_lock(ni);
838 err = attr_data_write_resident(ni, page);
839 ni_unlock(ni);
840 if (err != E_NTFS_NONRESIDENT) {
841 unlock_page(page);
842 return err;
843 }
844 }
845
846 return block_write_full_page(page, ntfs_get_block, wbc);
847 }
848
849 static int ntfs_writepages(struct address_space *mapping,
850 struct writeback_control *wbc)
851 {
852 /* Redirect call to 'ntfs_writepage' for resident files. */
853 if (is_resident(ntfs_i(mapping->host)))
854 return generic_writepages(mapping, wbc);
855 return mpage_writepages(mapping, wbc, ntfs_get_block);
856 }
857
858 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
859 struct buffer_head *bh_result, int create)
860 {
861 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
862 bh_result, create, GET_BLOCK_WRITE_BEGIN);
863 }
864
865 int ntfs_write_begin(struct file *file, struct address_space *mapping,
866 loff_t pos, u32 len, struct page **pagep, void **fsdata)
867 {
868 int err;
869 struct inode *inode = mapping->host;
870 struct ntfs_inode *ni = ntfs_i(inode);
871
872 *pagep = NULL;
873 if (is_resident(ni)) {
874 struct page *page = grab_cache_page_write_begin(
875 mapping, pos >> PAGE_SHIFT);
876
877 if (!page) {
878 err = -ENOMEM;
879 goto out;
880 }
881
882 ni_lock(ni);
883 err = attr_data_read_resident(ni, page);
884 ni_unlock(ni);
885
886 if (!err) {
887 *pagep = page;
888 goto out;
889 }
890 unlock_page(page);
891 put_page(page);
892
893 if (err != E_NTFS_NONRESIDENT)
894 goto out;
895 }
896
897 err = block_write_begin(mapping, pos, len, pagep,
898 ntfs_get_block_write_begin);
899
900 out:
901 return err;
902 }
903
904 /*
905 * ntfs_write_end - Address_space_operations::write_end.
906 */
907 int ntfs_write_end(struct file *file, struct address_space *mapping,
908 loff_t pos, u32 len, u32 copied, struct page *page,
909 void *fsdata)
910 {
911 struct inode *inode = mapping->host;
912 struct ntfs_inode *ni = ntfs_i(inode);
913 u64 valid = ni->i_valid;
914 bool dirty = false;
915 int err;
916
917 if (is_resident(ni)) {
918 ni_lock(ni);
919 err = attr_data_write_resident(ni, page);
920 ni_unlock(ni);
921 if (!err) {
922 dirty = true;
923 /* Clear any buffers in page. */
924 if (page_has_buffers(page)) {
925 struct buffer_head *head, *bh;
926
927 bh = head = page_buffers(page);
928 do {
929 clear_buffer_dirty(bh);
930 clear_buffer_mapped(bh);
931 set_buffer_uptodate(bh);
932 } while (head != (bh = bh->b_this_page));
933 }
934 SetPageUptodate(page);
935 err = copied;
936 }
937 unlock_page(page);
938 put_page(page);
939 } else {
940 err = generic_write_end(file, mapping, pos, len, copied, page,
941 fsdata);
942 }
943
944 if (err >= 0) {
945 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
946 inode->i_ctime = inode->i_mtime = current_time(inode);
947 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
948 dirty = true;
949 }
950
951 if (valid != ni->i_valid) {
952 /* ni->i_valid is changed in ntfs_get_block_vbo. */
953 dirty = true;
954 }
955
956 if (dirty)
957 mark_inode_dirty(inode);
958 }
959
960 return err;
961 }
962
963 int reset_log_file(struct inode *inode)
964 {
965 int err;
966 loff_t pos = 0;
967 u32 log_size = inode->i_size;
968 struct address_space *mapping = inode->i_mapping;
969
970 for (;;) {
971 u32 len;
972 void *kaddr;
973 struct page *page;
974
975 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
976
977 err = block_write_begin(mapping, pos, len, &page,
978 ntfs_get_block_write_begin);
979 if (err)
980 goto out;
981
982 kaddr = kmap_atomic(page);
983 memset(kaddr, -1, len);
984 kunmap_atomic(kaddr);
985 flush_dcache_page(page);
986
987 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
988 if (err < 0)
989 goto out;
990 pos += len;
991
992 if (pos >= log_size)
993 break;
994 balance_dirty_pages_ratelimited(mapping);
995 }
996 out:
997 mark_inode_dirty_sync(inode);
998
999 return err;
1000 }
1001
1002 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1003 {
1004 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1005 }
1006
1007 int ntfs_sync_inode(struct inode *inode)
1008 {
1009 return _ni_write_inode(inode, 1);
1010 }
1011
1012 /*
1013 * writeback_inode - Helper function for ntfs_flush_inodes().
1014 *
1015 * This writes both the inode and the file data blocks, waiting
1016 * for in flight data blocks before the start of the call. It
1017 * does not wait for any io started during the call.
1018 */
1019 static int writeback_inode(struct inode *inode)
1020 {
1021 int ret = sync_inode_metadata(inode, 0);
1022
1023 if (!ret)
1024 ret = filemap_fdatawrite(inode->i_mapping);
1025 return ret;
1026 }
1027
1028 /*
1029 * ntfs_flush_inodes
1030 *
1031 * Write data and metadata corresponding to i1 and i2. The io is
1032 * started but we do not wait for any of it to finish.
1033 *
1034 * filemap_flush() is used for the block device, so if there is a dirty
1035 * page for a block already in flight, we will not wait and start the
1036 * io over again.
1037 */
1038 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1039 struct inode *i2)
1040 {
1041 int ret = 0;
1042
1043 if (i1)
1044 ret = writeback_inode(i1);
1045 if (!ret && i2)
1046 ret = writeback_inode(i2);
1047 if (!ret)
1048 ret = sync_blockdev_nowait(sb->s_bdev);
1049 return ret;
1050 }
1051
1052 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1053 {
1054 pgoff_t idx;
1055
1056 /* Write non resident data. */
1057 for (idx = 0; bytes; idx++) {
1058 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1059 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1060
1061 if (IS_ERR(page))
1062 return PTR_ERR(page);
1063
1064 lock_page(page);
1065 WARN_ON(!PageUptodate(page));
1066 ClearPageUptodate(page);
1067
1068 memcpy(page_address(page), data, op);
1069
1070 flush_dcache_page(page);
1071 SetPageUptodate(page);
1072 unlock_page(page);
1073
1074 ntfs_unmap_page(page);
1075
1076 bytes -= op;
1077 data = Add2Ptr(data, PAGE_SIZE);
1078 }
1079 return 0;
1080 }
1081
1082 /*
1083 * ntfs_reparse_bytes
1084 *
1085 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1086 * for unicode string of @uni_len length.
1087 */
1088 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1089 {
1090 /* Header + unicode string + decorated unicode string. */
1091 return sizeof(short) * (2 * uni_len + 4) +
1092 offsetof(struct REPARSE_DATA_BUFFER,
1093 SymbolicLinkReparseBuffer.PathBuffer);
1094 }
1095
1096 static struct REPARSE_DATA_BUFFER *
1097 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1098 u32 size, u16 *nsize)
1099 {
1100 int i, err;
1101 struct REPARSE_DATA_BUFFER *rp;
1102 __le16 *rp_name;
1103 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1104
1105 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1106 if (!rp)
1107 return ERR_PTR(-ENOMEM);
1108
1109 rs = &rp->SymbolicLinkReparseBuffer;
1110 rp_name = rs->PathBuffer;
1111
1112 /* Convert link name to UTF-16. */
1113 err = ntfs_nls_to_utf16(sbi, symname, size,
1114 (struct cpu_str *)(rp_name - 1), 2 * size,
1115 UTF16_LITTLE_ENDIAN);
1116 if (err < 0)
1117 goto out;
1118
1119 /* err = the length of unicode name of symlink. */
1120 *nsize = ntfs_reparse_bytes(err);
1121
1122 if (*nsize > sbi->reparse.max_size) {
1123 err = -EFBIG;
1124 goto out;
1125 }
1126
1127 /* Translate Linux '/' into Windows '\'. */
1128 for (i = 0; i < err; i++) {
1129 if (rp_name[i] == cpu_to_le16('/'))
1130 rp_name[i] = cpu_to_le16('\\');
1131 }
1132
1133 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1134 rp->ReparseDataLength =
1135 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1136 SymbolicLinkReparseBuffer));
1137
1138 /* PrintName + SubstituteName. */
1139 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1140 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1141 rs->PrintNameLength = rs->SubstituteNameOffset;
1142
1143 /*
1144 * TODO: Use relative path if possible to allow Windows to
1145 * parse this path.
1146 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1147 */
1148 rs->Flags = 0;
1149
1150 memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1151
1152 /* Decorate SubstituteName. */
1153 rp_name += err;
1154 rp_name[0] = cpu_to_le16('\\');
1155 rp_name[1] = cpu_to_le16('?');
1156 rp_name[2] = cpu_to_le16('?');
1157 rp_name[3] = cpu_to_le16('\\');
1158
1159 return rp;
1160 out:
1161 kfree(rp);
1162 return ERR_PTR(err);
1163 }
1164
1165 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
1166 struct inode *dir, struct dentry *dentry,
1167 const struct cpu_str *uni, umode_t mode,
1168 dev_t dev, const char *symname, u32 size,
1169 struct ntfs_fnd *fnd)
1170 {
1171 int err;
1172 struct super_block *sb = dir->i_sb;
1173 struct ntfs_sb_info *sbi = sb->s_fs_info;
1174 const struct qstr *name = &dentry->d_name;
1175 CLST ino = 0;
1176 struct ntfs_inode *dir_ni = ntfs_i(dir);
1177 struct ntfs_inode *ni = NULL;
1178 struct inode *inode = NULL;
1179 struct ATTRIB *attr;
1180 struct ATTR_STD_INFO5 *std5;
1181 struct ATTR_FILE_NAME *fname;
1182 struct MFT_REC *rec;
1183 u32 asize, dsize, sd_size;
1184 enum FILE_ATTRIBUTE fa;
1185 __le32 security_id = SECURITY_ID_INVALID;
1186 CLST vcn;
1187 const void *sd;
1188 u16 t16, nsize = 0, aid = 0;
1189 struct INDEX_ROOT *root, *dir_root;
1190 struct NTFS_DE *e, *new_de = NULL;
1191 struct REPARSE_DATA_BUFFER *rp = NULL;
1192 bool rp_inserted = false;
1193
1194 ni_lock_dir(dir_ni);
1195
1196 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1197 if (!dir_root) {
1198 err = -EINVAL;
1199 goto out1;
1200 }
1201
1202 if (S_ISDIR(mode)) {
1203 /* Use parent's directory attributes. */
1204 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1205 FILE_ATTRIBUTE_ARCHIVE;
1206 /*
1207 * By default child directory inherits parent attributes.
1208 * Root directory is hidden + system.
1209 * Make an exception for children in root.
1210 */
1211 if (dir->i_ino == MFT_REC_ROOT)
1212 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1213 } else if (S_ISLNK(mode)) {
1214 /* It is good idea that link should be the same type (file/dir) as target */
1215 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1216
1217 /*
1218 * Linux: there are dir/file/symlink and so on.
1219 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1220 * It is good idea to create:
1221 * dir + reparse if 'symname' points to directory
1222 * or
1223 * file + reparse if 'symname' points to file
1224 * Unfortunately kern_path hangs if symname contains 'dir'.
1225 */
1226
1227 /*
1228 * struct path path;
1229 *
1230 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1231 * struct inode *target = d_inode(path.dentry);
1232 *
1233 * if (S_ISDIR(target->i_mode))
1234 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1235 * // if ( target->i_sb == sb ){
1236 * // use relative path?
1237 * // }
1238 * path_put(&path);
1239 * }
1240 */
1241 } else if (S_ISREG(mode)) {
1242 if (sbi->options->sparse) {
1243 /* Sparsed regular file, cause option 'sparse'. */
1244 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1245 FILE_ATTRIBUTE_ARCHIVE;
1246 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1247 /* Compressed regular file, if parent is compressed. */
1248 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1249 } else {
1250 /* Regular file, default attributes. */
1251 fa = FILE_ATTRIBUTE_ARCHIVE;
1252 }
1253 } else {
1254 fa = FILE_ATTRIBUTE_ARCHIVE;
1255 }
1256
1257 if (!(mode & 0222))
1258 fa |= FILE_ATTRIBUTE_READONLY;
1259
1260 /* Allocate PATH_MAX bytes. */
1261 new_de = __getname();
1262 if (!new_de) {
1263 err = -ENOMEM;
1264 goto out1;
1265 }
1266
1267 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1268 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1269
1270 /* Step 1: allocate and fill new mft record. */
1271 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1272 if (err)
1273 goto out2;
1274
1275 ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY);
1276 if (IS_ERR(ni)) {
1277 err = PTR_ERR(ni);
1278 ni = NULL;
1279 goto out3;
1280 }
1281 inode = &ni->vfs_inode;
1282 inode_init_owner(mnt_userns, inode, dir, mode);
1283 mode = inode->i_mode;
1284
1285 inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
1286 current_time(inode);
1287
1288 rec = ni->mi.mrec;
1289 rec->hard_links = cpu_to_le16(1);
1290 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1291
1292 /* Get default security id. */
1293 sd = s_default_security;
1294 sd_size = sizeof(s_default_security);
1295
1296 if (is_ntfs3(sbi)) {
1297 security_id = dir_ni->std_security_id;
1298 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1299 security_id = sbi->security.def_security_id;
1300
1301 if (security_id == SECURITY_ID_INVALID &&
1302 !ntfs_insert_security(sbi, sd, sd_size,
1303 &security_id, NULL))
1304 sbi->security.def_security_id = security_id;
1305 }
1306 }
1307
1308 /* Insert standard info. */
1309 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1310
1311 if (security_id == SECURITY_ID_INVALID) {
1312 dsize = sizeof(struct ATTR_STD_INFO);
1313 } else {
1314 dsize = sizeof(struct ATTR_STD_INFO5);
1315 std5->security_id = security_id;
1316 ni->std_security_id = security_id;
1317 }
1318 asize = SIZEOF_RESIDENT + dsize;
1319
1320 attr->type = ATTR_STD;
1321 attr->size = cpu_to_le32(asize);
1322 attr->id = cpu_to_le16(aid++);
1323 attr->res.data_off = SIZEOF_RESIDENT_LE;
1324 attr->res.data_size = cpu_to_le32(dsize);
1325
1326 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1327 kernel2nt(&inode->i_atime);
1328
1329 ni->std_fa = fa;
1330 std5->fa = fa;
1331
1332 attr = Add2Ptr(attr, asize);
1333
1334 /* Insert file name. */
1335 err = fill_name_de(sbi, new_de, name, uni);
1336 if (err)
1337 goto out4;
1338
1339 mi_get_ref(&ni->mi, &new_de->ref);
1340
1341 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1342 mi_get_ref(&dir_ni->mi, &fname->home);
1343 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1344 fname->dup.a_time = std5->cr_time;
1345 fname->dup.alloc_size = fname->dup.data_size = 0;
1346 fname->dup.fa = std5->fa;
1347 fname->dup.ea_size = fname->dup.reparse = 0;
1348
1349 dsize = le16_to_cpu(new_de->key_size);
1350 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1351
1352 attr->type = ATTR_NAME;
1353 attr->size = cpu_to_le32(asize);
1354 attr->res.data_off = SIZEOF_RESIDENT_LE;
1355 attr->res.flags = RESIDENT_FLAG_INDEXED;
1356 attr->id = cpu_to_le16(aid++);
1357 attr->res.data_size = cpu_to_le32(dsize);
1358 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1359
1360 attr = Add2Ptr(attr, asize);
1361
1362 if (security_id == SECURITY_ID_INVALID) {
1363 /* Insert security attribute. */
1364 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1365
1366 attr->type = ATTR_SECURE;
1367 attr->size = cpu_to_le32(asize);
1368 attr->id = cpu_to_le16(aid++);
1369 attr->res.data_off = SIZEOF_RESIDENT_LE;
1370 attr->res.data_size = cpu_to_le32(sd_size);
1371 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1372
1373 attr = Add2Ptr(attr, asize);
1374 }
1375
1376 attr->id = cpu_to_le16(aid++);
1377 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1378 /*
1379 * Regular directory or symlink to directory.
1380 * Create root attribute.
1381 */
1382 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1383 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1384
1385 attr->type = ATTR_ROOT;
1386 attr->size = cpu_to_le32(asize);
1387
1388 attr->name_len = ARRAY_SIZE(I30_NAME);
1389 attr->name_off = SIZEOF_RESIDENT_LE;
1390 attr->res.data_off =
1391 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1392 attr->res.data_size = cpu_to_le32(dsize);
1393 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1394 sizeof(I30_NAME));
1395
1396 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1397 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1398 root->ihdr.de_off =
1399 cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10
1400 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1401 sizeof(struct NTFS_DE));
1402 root->ihdr.total = root->ihdr.used;
1403
1404 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1405 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1406 e->flags = NTFS_IE_LAST;
1407 } else if (S_ISLNK(mode)) {
1408 /*
1409 * Symlink to file.
1410 * Create empty resident data attribute.
1411 */
1412 asize = SIZEOF_RESIDENT;
1413
1414 /* Insert empty ATTR_DATA */
1415 attr->type = ATTR_DATA;
1416 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1417 attr->name_off = SIZEOF_RESIDENT_LE;
1418 attr->res.data_off = SIZEOF_RESIDENT_LE;
1419 } else if (S_ISREG(mode)) {
1420 /*
1421 * Regular file. Create empty non resident data attribute.
1422 */
1423 attr->type = ATTR_DATA;
1424 attr->non_res = 1;
1425 attr->nres.evcn = cpu_to_le64(-1ll);
1426 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1427 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1428 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1429 attr->flags = ATTR_FLAG_SPARSED;
1430 asize = SIZEOF_NONRESIDENT_EX + 8;
1431 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1432 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1433 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1434 attr->flags = ATTR_FLAG_COMPRESSED;
1435 attr->nres.c_unit = COMPRESSION_UNIT;
1436 asize = SIZEOF_NONRESIDENT_EX + 8;
1437 } else {
1438 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1439 attr->name_off = SIZEOF_NONRESIDENT_LE;
1440 asize = SIZEOF_NONRESIDENT + 8;
1441 }
1442 attr->nres.run_off = attr->name_off;
1443 } else {
1444 /*
1445 * Node. Create empty resident data attribute.
1446 */
1447 attr->type = ATTR_DATA;
1448 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1449 attr->name_off = SIZEOF_RESIDENT_LE;
1450 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1451 attr->flags = ATTR_FLAG_SPARSED;
1452 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1453 attr->flags = ATTR_FLAG_COMPRESSED;
1454 attr->res.data_off = SIZEOF_RESIDENT_LE;
1455 asize = SIZEOF_RESIDENT;
1456 ni->ni_flags |= NI_FLAG_RESIDENT;
1457 }
1458
1459 if (S_ISDIR(mode)) {
1460 ni->ni_flags |= NI_FLAG_DIR;
1461 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1462 if (err)
1463 goto out4;
1464 } else if (S_ISLNK(mode)) {
1465 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1466
1467 if (IS_ERR(rp)) {
1468 err = PTR_ERR(rp);
1469 rp = NULL;
1470 goto out4;
1471 }
1472
1473 /*
1474 * Insert ATTR_REPARSE.
1475 */
1476 attr = Add2Ptr(attr, asize);
1477 attr->type = ATTR_REPARSE;
1478 attr->id = cpu_to_le16(aid++);
1479
1480 /* Resident or non resident? */
1481 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1482 t16 = PtrOffset(rec, attr);
1483
1484 /*
1485 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1486 * It is good idea to keep extened attributes resident.
1487 */
1488 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1489 CLST alen;
1490 CLST clst = bytes_to_cluster(sbi, nsize);
1491
1492 /* Bytes per runs. */
1493 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1494
1495 attr->non_res = 1;
1496 attr->nres.evcn = cpu_to_le64(clst - 1);
1497 attr->name_off = SIZEOF_NONRESIDENT_LE;
1498 attr->nres.run_off = attr->name_off;
1499 attr->nres.data_size = cpu_to_le64(nsize);
1500 attr->nres.valid_size = attr->nres.data_size;
1501 attr->nres.alloc_size =
1502 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1503
1504 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1505 clst, NULL, 0, &alen, 0,
1506 NULL);
1507 if (err)
1508 goto out5;
1509
1510 err = run_pack(&ni->file.run, 0, clst,
1511 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1512 &vcn);
1513 if (err < 0)
1514 goto out5;
1515
1516 if (vcn != clst) {
1517 err = -EINVAL;
1518 goto out5;
1519 }
1520
1521 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1522 } else {
1523 attr->res.data_off = SIZEOF_RESIDENT_LE;
1524 attr->res.data_size = cpu_to_le32(nsize);
1525 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1526 nsize = 0;
1527 }
1528 /* Size of symlink equals the length of input string. */
1529 inode->i_size = size;
1530
1531 attr->size = cpu_to_le32(asize);
1532
1533 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1534 &new_de->ref);
1535 if (err)
1536 goto out5;
1537
1538 rp_inserted = true;
1539 }
1540
1541 attr = Add2Ptr(attr, asize);
1542 attr->type = ATTR_END;
1543
1544 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1545 rec->next_attr_id = cpu_to_le16(aid);
1546
1547 /* Step 2: Add new name in index. */
1548 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1549 if (err)
1550 goto out6;
1551
1552 /* Unlock parent directory before ntfs_init_acl. */
1553 ni_unlock(dir_ni);
1554
1555 inode->i_generation = le16_to_cpu(rec->seq);
1556
1557 dir->i_mtime = dir->i_ctime = inode->i_atime;
1558
1559 if (S_ISDIR(mode)) {
1560 inode->i_op = &ntfs_dir_inode_operations;
1561 inode->i_fop = &ntfs_dir_operations;
1562 } else if (S_ISLNK(mode)) {
1563 inode->i_op = &ntfs_link_inode_operations;
1564 inode->i_fop = NULL;
1565 inode->i_mapping->a_ops = &ntfs_aops;
1566 inode->i_size = size;
1567 inode_nohighmem(inode);
1568 } else if (S_ISREG(mode)) {
1569 inode->i_op = &ntfs_file_inode_operations;
1570 inode->i_fop = &ntfs_file_operations;
1571 inode->i_mapping->a_ops =
1572 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
1573 init_rwsem(&ni->file.run_lock);
1574 } else {
1575 inode->i_op = &ntfs_special_inode_operations;
1576 init_special_inode(inode, mode, dev);
1577 }
1578
1579 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1580 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1581 err = ntfs_init_acl(mnt_userns, inode, dir);
1582 if (err)
1583 goto out7;
1584 } else
1585 #endif
1586 {
1587 inode->i_flags |= S_NOSEC;
1588 }
1589
1590 /* Write non resident data. */
1591 if (nsize) {
1592 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0);
1593 if (err)
1594 goto out7;
1595 }
1596
1597 /*
1598 * Call 'd_instantiate' after inode->i_op is set
1599 * but before finish_open.
1600 */
1601 d_instantiate(dentry, inode);
1602
1603 ntfs_save_wsl_perm(inode);
1604 mark_inode_dirty(dir);
1605 mark_inode_dirty(inode);
1606
1607 /* Normal exit. */
1608 goto out2;
1609
1610 out7:
1611
1612 /* Undo 'indx_insert_entry'. */
1613 ni_lock_dir(dir_ni);
1614 indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
1615 le16_to_cpu(new_de->key_size), sbi);
1616 /* ni_unlock(dir_ni); will be called later. */
1617 out6:
1618 if (rp_inserted)
1619 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1620
1621 out5:
1622 if (S_ISDIR(mode) || run_is_empty(&ni->file.run))
1623 goto out4;
1624
1625 run_deallocate(sbi, &ni->file.run, false);
1626
1627 out4:
1628 clear_rec_inuse(rec);
1629 clear_nlink(inode);
1630 ni->mi.dirty = false;
1631 discard_new_inode(inode);
1632 out3:
1633 ntfs_mark_rec_free(sbi, ino, false);
1634
1635 out2:
1636 __putname(new_de);
1637 kfree(rp);
1638
1639 out1:
1640 if (err) {
1641 ni_unlock(dir_ni);
1642 return ERR_PTR(err);
1643 }
1644
1645 unlock_new_inode(inode);
1646
1647 return inode;
1648 }
1649
1650 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1651 {
1652 int err;
1653 struct ntfs_inode *ni = ntfs_i(inode);
1654 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1655 struct NTFS_DE *de;
1656
1657 /* Allocate PATH_MAX bytes. */
1658 de = __getname();
1659 if (!de)
1660 return -ENOMEM;
1661
1662 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1663 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1664
1665 /* Construct 'de'. */
1666 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1667 if (err)
1668 goto out;
1669
1670 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1671 out:
1672 __putname(de);
1673 return err;
1674 }
1675
1676 /*
1677 * ntfs_unlink_inode
1678 *
1679 * inode_operations::unlink
1680 * inode_operations::rmdir
1681 */
1682 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1683 {
1684 int err;
1685 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1686 struct inode *inode = d_inode(dentry);
1687 struct ntfs_inode *ni = ntfs_i(inode);
1688 struct ntfs_inode *dir_ni = ntfs_i(dir);
1689 struct NTFS_DE *de, *de2 = NULL;
1690 int undo_remove;
1691
1692 if (ntfs_is_meta_file(sbi, ni->mi.rno))
1693 return -EINVAL;
1694
1695 /* Allocate PATH_MAX bytes. */
1696 de = __getname();
1697 if (!de)
1698 return -ENOMEM;
1699
1700 ni_lock(ni);
1701
1702 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1703 err = -ENOTEMPTY;
1704 goto out;
1705 }
1706
1707 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1708 if (err < 0)
1709 goto out;
1710
1711 undo_remove = 0;
1712 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1713
1714 if (!err) {
1715 drop_nlink(inode);
1716 dir->i_mtime = dir->i_ctime = current_time(dir);
1717 mark_inode_dirty(dir);
1718 inode->i_ctime = dir->i_ctime;
1719 if (inode->i_nlink)
1720 mark_inode_dirty(inode);
1721 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1722 _ntfs_bad_inode(inode);
1723 } else {
1724 if (ni_is_dirty(dir))
1725 mark_inode_dirty(dir);
1726 if (ni_is_dirty(inode))
1727 mark_inode_dirty(inode);
1728 }
1729
1730 out:
1731 ni_unlock(ni);
1732 __putname(de);
1733 return err;
1734 }
1735
1736 void ntfs_evict_inode(struct inode *inode)
1737 {
1738 truncate_inode_pages_final(&inode->i_data);
1739
1740 if (inode->i_nlink)
1741 _ni_write_inode(inode, inode_needs_sync(inode));
1742
1743 invalidate_inode_buffers(inode);
1744 clear_inode(inode);
1745
1746 ni_clear(ntfs_i(inode));
1747 }
1748
1749 static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer,
1750 int buflen)
1751 {
1752 int i, err = -EINVAL;
1753 struct ntfs_inode *ni = ntfs_i(inode);
1754 struct super_block *sb = inode->i_sb;
1755 struct ntfs_sb_info *sbi = sb->s_fs_info;
1756 u64 size;
1757 u16 ulen = 0;
1758 void *to_free = NULL;
1759 struct REPARSE_DATA_BUFFER *rp;
1760 const __le16 *uname;
1761 struct ATTRIB *attr;
1762
1763 /* Reparse data present. Try to parse it. */
1764 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1765 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1766
1767 *buffer = 0;
1768
1769 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1770 if (!attr)
1771 goto out;
1772
1773 if (!attr->non_res) {
1774 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1775 if (!rp)
1776 goto out;
1777 size = le32_to_cpu(attr->res.data_size);
1778 } else {
1779 size = le64_to_cpu(attr->nres.data_size);
1780 rp = NULL;
1781 }
1782
1783 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1784 goto out;
1785
1786 if (!rp) {
1787 rp = kmalloc(size, GFP_NOFS);
1788 if (!rp) {
1789 err = -ENOMEM;
1790 goto out;
1791 }
1792 to_free = rp;
1793 /* Read into temporal buffer. */
1794 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1795 if (err)
1796 goto out;
1797 }
1798
1799 /* Microsoft Tag. */
1800 switch (rp->ReparseTag) {
1801 case IO_REPARSE_TAG_MOUNT_POINT:
1802 /* Mount points and junctions. */
1803 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1804 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1805 MountPointReparseBuffer.PathBuffer))
1806 goto out;
1807 uname = Add2Ptr(rp,
1808 offsetof(struct REPARSE_DATA_BUFFER,
1809 MountPointReparseBuffer.PathBuffer) +
1810 le16_to_cpu(rp->MountPointReparseBuffer
1811 .PrintNameOffset));
1812 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1813 break;
1814
1815 case IO_REPARSE_TAG_SYMLINK:
1816 /* FolderSymbolicLink */
1817 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1818 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1819 SymbolicLinkReparseBuffer.PathBuffer))
1820 goto out;
1821 uname = Add2Ptr(
1822 rp, offsetof(struct REPARSE_DATA_BUFFER,
1823 SymbolicLinkReparseBuffer.PathBuffer) +
1824 le16_to_cpu(rp->SymbolicLinkReparseBuffer
1825 .PrintNameOffset));
1826 ulen = le16_to_cpu(
1827 rp->SymbolicLinkReparseBuffer.PrintNameLength);
1828 break;
1829
1830 case IO_REPARSE_TAG_CLOUD:
1831 case IO_REPARSE_TAG_CLOUD_1:
1832 case IO_REPARSE_TAG_CLOUD_2:
1833 case IO_REPARSE_TAG_CLOUD_3:
1834 case IO_REPARSE_TAG_CLOUD_4:
1835 case IO_REPARSE_TAG_CLOUD_5:
1836 case IO_REPARSE_TAG_CLOUD_6:
1837 case IO_REPARSE_TAG_CLOUD_7:
1838 case IO_REPARSE_TAG_CLOUD_8:
1839 case IO_REPARSE_TAG_CLOUD_9:
1840 case IO_REPARSE_TAG_CLOUD_A:
1841 case IO_REPARSE_TAG_CLOUD_B:
1842 case IO_REPARSE_TAG_CLOUD_C:
1843 case IO_REPARSE_TAG_CLOUD_D:
1844 case IO_REPARSE_TAG_CLOUD_E:
1845 case IO_REPARSE_TAG_CLOUD_F:
1846 err = sizeof("OneDrive") - 1;
1847 if (err > buflen)
1848 err = buflen;
1849 memcpy(buffer, "OneDrive", err);
1850 goto out;
1851
1852 default:
1853 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
1854 /* Unknown Microsoft Tag. */
1855 goto out;
1856 }
1857 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
1858 size <= sizeof(struct REPARSE_POINT)) {
1859 goto out;
1860 }
1861
1862 /* Users tag. */
1863 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
1864 ulen = le16_to_cpu(rp->ReparseDataLength) -
1865 sizeof(struct REPARSE_POINT);
1866 }
1867
1868 /* Convert nlen from bytes to UNICODE chars. */
1869 ulen >>= 1;
1870
1871 /* Check that name is available. */
1872 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
1873 goto out;
1874
1875 /* If name is already zero terminated then truncate it now. */
1876 if (!uname[ulen - 1])
1877 ulen -= 1;
1878
1879 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
1880
1881 if (err < 0)
1882 goto out;
1883
1884 /* Translate Windows '\' into Linux '/'. */
1885 for (i = 0; i < err; i++) {
1886 if (buffer[i] == '\\')
1887 buffer[i] = '/';
1888 }
1889
1890 /* Always set last zero. */
1891 buffer[err] = 0;
1892 out:
1893 kfree(to_free);
1894 return err;
1895 }
1896
1897 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
1898 struct delayed_call *done)
1899 {
1900 int err;
1901 char *ret;
1902
1903 if (!de)
1904 return ERR_PTR(-ECHILD);
1905
1906 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
1907 if (!ret)
1908 return ERR_PTR(-ENOMEM);
1909
1910 err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE);
1911 if (err < 0) {
1912 kfree(ret);
1913 return ERR_PTR(err);
1914 }
1915
1916 set_delayed_call(done, kfree_link, ret);
1917
1918 return ret;
1919 }
1920
1921 // clang-format off
1922 const struct inode_operations ntfs_link_inode_operations = {
1923 .get_link = ntfs_get_link,
1924 .setattr = ntfs3_setattr,
1925 .listxattr = ntfs_listxattr,
1926 .permission = ntfs_permission,
1927 };
1928
1929 const struct address_space_operations ntfs_aops = {
1930 .read_folio = ntfs_read_folio,
1931 .readahead = ntfs_readahead,
1932 .writepage = ntfs_writepage,
1933 .writepages = ntfs_writepages,
1934 .write_begin = ntfs_write_begin,
1935 .write_end = ntfs_write_end,
1936 .direct_IO = ntfs_direct_IO,
1937 .bmap = ntfs_bmap,
1938 .dirty_folio = block_dirty_folio,
1939 .invalidate_folio = block_invalidate_folio,
1940 };
1941
1942 const struct address_space_operations ntfs_aops_cmpr = {
1943 .read_folio = ntfs_read_folio,
1944 .readahead = ntfs_readahead,
1945 };
1946 // clang-format on
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