projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
fs/ntfs3: Refactor ntfs_readlink_hlp
[linux-block.git] / fs / ntfs3 / inode.c
CommitLineData
82cae269
KK		 1// SPDX-License-Identifier: GPL-2.0
2/*
3 *
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
5 *
6 */
7
82cae269
KK		 8#include <linux/buffer_head.h>
9#include <linux/fs.h>
82cae269
KK		 10#include <linux/mpage.h>
11#include <linux/namei.h>
12#include <linux/nls.h>
13#include <linux/uio.h>
82cae269
KK		 14#include <linux/writeback.h>
15
16#include "debug.h"
17#include "ntfs.h"
18#include "ntfs_fs.h"
19
20/*
e8b8e97f 21 * ntfs_read_mft - Read record and parses MFT.
82cae269
KK		 22 */
23static 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' */
564c97bd
KA		 50 inode->i_uid = sbi->options->fs_uid;
51 inode->i_gid = sbi->options->fs_gid;
82cae269
KK		 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) {
d3624466 90 /* Bad inode? */
82cae269
KK		 91 err = -EINVAL;
92 goto out;
93 }
94
95 if (!is_rec_base(rec))
96 goto Ok;
97
e8b8e97f 98 /* Record should contain $I30 root. */
82cae269
KK		 99 is_dir = rec->flags & RECORD_FLAG_DIR;
100
101 inode->i_generation = le16_to_cpu(rec->seq);
102
e8b8e97f 103 /* Enumerate all struct Attributes MFT. */
82cae269
KK		 104 le = NULL;
105 attr = NULL;
106
107 /*
e8b8e97f 108 * To reduce tab pressure use goto instead of
82cae269
KK		 109 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
110 */
111next_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) {
e8b8e97f 119 /* This is non primary attribute segment. Ignore if not MFT. */
82cae269
KK		 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) {
e8b8e97f 189 /* Ignore data attribute in dir record. */
82cae269
KK		 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))))) {
e8b8e97f 203 /* File contains stream attribute. Ignore it. */
82cae269
KK		 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 t32 = asize;
226 } else {
227 t32 = le16_to_cpu(attr->nres.run_off);
228 }
229
564c97bd 230 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
82cae269
KK		 231
232 if (!attr->non_res) {
233 ni->ni_flags |= NI_FLAG_RESIDENT;
234 goto next_attr;
235 }
236
237 inode_set_bytes(inode, attr_ondisk_size(attr));
238
239 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
240 inode->i_size = le64_to_cpu(attr->nres.data_size);
241 if (!attr->nres.alloc_size)
242 goto next_attr;
243
244 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run
245 : &ni->file.run;
246 break;
247
248 case ATTR_ROOT:
249 if (attr->non_res)
250 goto out;
251
252 root = Add2Ptr(attr, roff);
253 is_root = true;
254
255 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
256 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
257 goto next_attr;
258
259 if (root->type != ATTR_NAME ||
260 root->rule != NTFS_COLLATION_TYPE_FILENAME)
261 goto out;
262
263 if (!is_dir)
264 goto next_attr;
265
266 ni->ni_flags |= NI_FLAG_DIR;
267
268 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
269 if (err)
270 goto out;
271
272 mode = sb->s_root
564c97bd 273 ? (S_IFDIR | (0777 & sbi->options->fs_dmask_inv))
82cae269
KK		 274 : (S_IFDIR | 0777);
275 goto next_attr;
276
277 case ATTR_ALLOC:
278 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
279 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
280 goto next_attr;
281
282 inode->i_size = le64_to_cpu(attr->nres.data_size);
283 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
284 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
285
286 run = &ni->dir.alloc_run;
287 break;
288
289 case ATTR_BITMAP:
290 if (ino == MFT_REC_MFT) {
291 if (!attr->non_res)
292 goto out;
293#ifndef CONFIG_NTFS3_64BIT_CLUSTER
294 /* 0x20000000 = 2^32 / 8 */
295 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
296 goto out;
297#endif
298 run = &sbi->mft.bitmap.run;
299 break;
300 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
301 !memcmp(attr_name(attr), I30_NAME,
302 sizeof(I30_NAME)) &&
303 attr->non_res) {
304 run = &ni->dir.bitmap_run;
305 break;
306 }
307 goto next_attr;
308
309 case ATTR_REPARSE:
310 if (attr->name_len)
311 goto next_attr;
312
313 rp_fa = ni_parse_reparse(ni, attr, &rp);
314 switch (rp_fa) {
315 case REPARSE_LINK:
316 if (!attr->non_res) {
317 inode->i_size = rsize;
318 inode_set_bytes(inode, rsize);
319 t32 = asize;
320 } else {
321 inode->i_size =
322 le64_to_cpu(attr->nres.data_size);
323 t32 = le16_to_cpu(attr->nres.run_off);
324 }
325
e8b8e97f 326 /* Looks like normal symlink. */
82cae269
KK		 327 ni->i_valid = inode->i_size;
328
e8b8e97f 329 /* Clear directory bit. */
82cae269
KK		 330 if (ni->ni_flags & NI_FLAG_DIR) {
331 indx_clear(&ni->dir);
332 memset(&ni->dir, 0, sizeof(ni->dir));
333 ni->ni_flags &= ~NI_FLAG_DIR;
334 } else {
335 run_close(&ni->file.run);
336 }
337 mode = S_IFLNK | 0777;
338 is_dir = false;
339 if (attr->non_res) {
340 run = &ni->file.run;
e8b8e97f 341 goto attr_unpack_run; // Double break.
82cae269
KK		 342 }
343 break;
344
345 case REPARSE_COMPRESSED:
346 break;
347
348 case REPARSE_DEDUPLICATED:
349 break;
350 }
351 goto next_attr;
352
353 case ATTR_EA_INFO:
354 if (!attr->name_len &&
355 resident_data_ex(attr, sizeof(struct EA_INFO))) {
356 ni->ni_flags |= NI_FLAG_EA;
357 /*
358 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
359 */
360 inode->i_mode = mode;
361 ntfs_get_wsl_perm(inode);
362 mode = inode->i_mode;
363 }
364 goto next_attr;
365
366 default:
367 goto next_attr;
368 }
369
370attr_unpack_run:
371 roff = le16_to_cpu(attr->nres.run_off);
372
373 t64 = le64_to_cpu(attr->nres.svcn);
374 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
375 t64, Add2Ptr(attr, roff), asize - roff);
376 if (err < 0)
377 goto out;
378 err = 0;
379 goto next_attr;
380
381end_enum:
382
383 if (!std5)
384 goto out;
385
386 if (!is_match && name) {
e8b8e97f 387 /* Reuse rec as buffer for ascii name. */
82cae269
KK		 388 err = -ENOENT;
389 goto out;
390 }
391
392 if (std5->fa & FILE_ATTRIBUTE_READONLY)
393 mode &= ~0222;
394
395 if (!names) {
396 err = -EINVAL;
397 goto out;
398 }
399
78ab59fe
KK		 400 if (names != le16_to_cpu(rec->hard_links)) {
401 /* Correct minor error on the fly. Do not mark inode as dirty. */
402 rec->hard_links = cpu_to_le16(names);
403 ni->mi.dirty = true;
404 }
405
82cae269
KK		 406 set_nlink(inode, names);
407
408 if (S_ISDIR(mode)) {
409 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
410
411 /*
e8b8e97f 412 * Dot and dot-dot should be included in count but was not
82cae269 413 * included in enumeration.
e8b8e97f 414 * Usually a hard links to directories are disabled.
82cae269
KK		 415 */
416 inode->i_op = &ntfs_dir_inode_operations;
417 inode->i_fop = &ntfs_dir_operations;
418 ni->i_valid = 0;
419 } else if (S_ISLNK(mode)) {
420 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
421 inode->i_op = &ntfs_link_inode_operations;
422 inode->i_fop = NULL;
423 inode_nohighmem(inode); // ??
424 } else if (S_ISREG(mode)) {
425 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
426 inode->i_op = &ntfs_file_inode_operations;
427 inode->i_fop = &ntfs_file_operations;
428 inode->i_mapping->a_ops =
429 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
430 if (ino != MFT_REC_MFT)
431 init_rwsem(&ni->file.run_lock);
432 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
433 S_ISSOCK(mode)) {
434 inode->i_op = &ntfs_special_inode_operations;
435 init_special_inode(inode, mode, inode->i_rdev);
436 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
437 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
e8b8e97f 438 /* Records in $Extend are not a files or general directories. */
82cae269
KK		 439 } else {
440 err = -EINVAL;
441 goto out;
442 }
443
564c97bd 444 if ((sbi->options->sys_immutable &&
82cae269
KK		 445 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
446 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
447 inode->i_flags |= S_IMMUTABLE;
448 } else {
449 inode->i_flags &= ~S_IMMUTABLE;
450 }
451
452 inode->i_mode = mode;
453 if (!(ni->ni_flags & NI_FLAG_EA)) {
e8b8e97f 454 /* If no xattr then no security (stored in xattr). */
82cae269
KK		 455 inode->i_flags |= S_NOSEC;
456 }
457
458Ok:
459 if (ino == MFT_REC_MFT && !sb->s_root)
460 sbi->mft.ni = NULL;
461
462 unlock_new_inode(inode);
463
464 return inode;
465
466out:
467 if (ino == MFT_REC_MFT && !sb->s_root)
468 sbi->mft.ni = NULL;
469
470 iget_failed(inode);
471 return ERR_PTR(err);
472}
473
e8b8e97f
KA		 474/*
475 * ntfs_test_inode
476 *
477 * Return: 1 if match.
478 */
82cae269
KK		 479static int ntfs_test_inode(struct inode *inode, void *data)
480{
481 struct MFT_REF *ref = data;
482
483 return ino_get(ref) == inode->i_ino;
484}
485
486static int ntfs_set_inode(struct inode *inode, void *data)
487{
488 const struct MFT_REF *ref = data;
489
490 inode->i_ino = ino_get(ref);
491 return 0;
492}
493
494struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
495 const struct cpu_str *name)
496{
497 struct inode *inode;
498
499 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
500 (void *)ref);
501 if (unlikely(!inode))
502 return ERR_PTR(-ENOMEM);
503
504 /* If this is a freshly allocated inode, need to read it now. */
505 if (inode->i_state & I_NEW)
506 inode = ntfs_read_mft(inode, name, ref);
507 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
e8b8e97f 508 /* Inode overlaps? */
82cae269
KK		 509 make_bad_inode(inode);
510 }
511
512 return inode;
513}
514
515enum get_block_ctx {
516 GET_BLOCK_GENERAL = 0,
517 GET_BLOCK_WRITE_BEGIN = 1,
518 GET_BLOCK_DIRECT_IO_R = 2,
519 GET_BLOCK_DIRECT_IO_W = 3,
520 GET_BLOCK_BMAP = 4,
521};
522
523static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
524 struct buffer_head *bh, int create,
525 enum get_block_ctx ctx)
526{
527 struct super_block *sb = inode->i_sb;
528 struct ntfs_sb_info *sbi = sb->s_fs_info;
529 struct ntfs_inode *ni = ntfs_i(inode);
530 struct page *page = bh->b_page;
531 u8 cluster_bits = sbi->cluster_bits;
532 u32 block_size = sb->s_blocksize;
533 u64 bytes, lbo, valid;
534 u32 off;
535 int err;
536 CLST vcn, lcn, len;
537 bool new;
538
e8b8e97f 539 /* Clear previous state. */
82cae269
KK		 540 clear_buffer_new(bh);
541 clear_buffer_uptodate(bh);
542
e8b8e97f 543 /* Direct write uses 'create=0'. */
82cae269 544 if (!create && vbo >= ni->i_valid) {
e8b8e97f 545 /* Out of valid. */
82cae269
KK		 546 return 0;
547 }
548
549 if (vbo >= inode->i_size) {
e8b8e97f 550 /* Out of size. */
82cae269
KK		 551 return 0;
552 }
553
554 if (is_resident(ni)) {
555 ni_lock(ni);
556 err = attr_data_read_resident(ni, page);
557 ni_unlock(ni);
558
559 if (!err)
560 set_buffer_uptodate(bh);
561 bh->b_size = block_size;
562 return err;
563 }
564
565 vcn = vbo >> cluster_bits;
566 off = vbo & sbi->cluster_mask;
567 new = false;
568
569 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL);
570 if (err)
571 goto out;
572
573 if (!len)
574 return 0;
575
576 bytes = ((u64)len << cluster_bits) - off;
577
578 if (lcn == SPARSE_LCN) {
579 if (!create) {
580 if (bh->b_size > bytes)
581 bh->b_size = bytes;
582 return 0;
583 }
584 WARN_ON(1);
585 }
586
587 if (new) {
588 set_buffer_new(bh);
589 if ((len << cluster_bits) > block_size)
590 ntfs_sparse_cluster(inode, page, vcn, len);
591 }
592
593 lbo = ((u64)lcn << cluster_bits) + off;
594
595 set_buffer_mapped(bh);
596 bh->b_bdev = sb->s_bdev;
597 bh->b_blocknr = lbo >> sb->s_blocksize_bits;
598
599 valid = ni->i_valid;
600
601 if (ctx == GET_BLOCK_DIRECT_IO_W) {
e8b8e97f 602 /* ntfs_direct_IO will update ni->i_valid. */
82cae269
KK		 603 if (vbo >= valid)
604 set_buffer_new(bh);
605 } else if (create) {
d3624466 606 /* Normal write. */
82cae269
KK		 607 if (bytes > bh->b_size)
608 bytes = bh->b_size;
609
610 if (vbo >= valid)
611 set_buffer_new(bh);
612
613 if (vbo + bytes > valid) {
614 ni->i_valid = vbo + bytes;
615 mark_inode_dirty(inode);
616 }
617 } else if (vbo >= valid) {
e8b8e97f
KA		 618 /* Read out of valid data. */
619 /* Should never be here 'cause already checked. */
82cae269
KK		 620 clear_buffer_mapped(bh);
621 } else if (vbo + bytes <= valid) {
e8b8e97f 622 /* Normal read. */
82cae269 623 } else if (vbo + block_size <= valid) {
e8b8e97f 624 /* Normal short read. */
82cae269
KK		 625 bytes = block_size;
626 } else {
627 /*
e8b8e97f 628 * Read across valid size: vbo < valid && valid < vbo + block_size
82cae269
KK		 629 */
630 bytes = block_size;
631
632 if (page) {
633 u32 voff = valid - vbo;
634
635 bh->b_size = block_size;
636 off = vbo & (PAGE_SIZE - 1);
637 set_bh_page(bh, page, off);
638 ll_rw_block(REQ_OP_READ, 0, 1, &bh);
639 wait_on_buffer(bh);
640 if (!buffer_uptodate(bh)) {
641 err = -EIO;
642 goto out;
643 }
644 zero_user_segment(page, off + voff, off + block_size);
645 }
646 }
647
648 if (bh->b_size > bytes)
649 bh->b_size = bytes;
650
651#ifndef __LP64__
652 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
653 static_assert(sizeof(size_t) < sizeof(loff_t));
654 if (bytes > 0x40000000u)
655 bh->b_size = 0x40000000u;
656 }
657#endif
658
659 return 0;
660
661out:
662 return err;
663}
664
665int ntfs_get_block(struct inode *inode, sector_t vbn,
666 struct buffer_head *bh_result, int create)
667{
668 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
669 bh_result, create, GET_BLOCK_GENERAL);
670}
671
672static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
673 struct buffer_head *bh_result, int create)
674{
675 return ntfs_get_block_vbo(inode,
676 (u64)vsn << inode->i_sb->s_blocksize_bits,
677 bh_result, create, GET_BLOCK_BMAP);
678}
679
680static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
681{
682 return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
683}
684
685static int ntfs_readpage(struct file *file, struct page *page)
686{
687 int err;
688 struct address_space *mapping = page->mapping;
689 struct inode *inode = mapping->host;
690 struct ntfs_inode *ni = ntfs_i(inode);
691
692 if (is_resident(ni)) {
693 ni_lock(ni);
694 err = attr_data_read_resident(ni, page);
695 ni_unlock(ni);
696 if (err != E_NTFS_NONRESIDENT) {
697 unlock_page(page);
698 return err;
699 }
700 }
701
702 if (is_compressed(ni)) {
703 ni_lock(ni);
704 err = ni_readpage_cmpr(ni, page);
705 ni_unlock(ni);
706 return err;
707 }
708
e8b8e97f 709 /* Normal + sparse files. */
82cae269
KK		 710 return mpage_readpage(page, ntfs_get_block);
711}
712
713static void ntfs_readahead(struct readahead_control *rac)
714{
715 struct address_space *mapping = rac->mapping;
716 struct inode *inode = mapping->host;
717 struct ntfs_inode *ni = ntfs_i(inode);
718 u64 valid;
719 loff_t pos;
720
721 if (is_resident(ni)) {
e8b8e97f 722 /* No readahead for resident. */
82cae269
KK		 723 return;
724 }
725
726 if (is_compressed(ni)) {
e8b8e97f 727 /* No readahead for compressed. */
82cae269
KK		 728 return;
729 }
730
731 valid = ni->i_valid;
732 pos = readahead_pos(rac);
733
734 if (valid < i_size_read(inode) && pos <= valid &&
735 valid < pos + readahead_length(rac)) {
e8b8e97f 736 /* Range cross 'valid'. Read it page by page. */
82cae269
KK		 737 return;
738 }
739
740 mpage_readahead(rac, ntfs_get_block);
741}
742
743static int ntfs_get_block_direct_IO_R(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_R);
748}
749
750static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
751 struct buffer_head *bh_result, int create)
752{
753 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
754 bh_result, create, GET_BLOCK_DIRECT_IO_W);
755}
756
757static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
758{
759 struct file *file = iocb->ki_filp;
760 struct address_space *mapping = file->f_mapping;
761 struct inode *inode = mapping->host;
762 struct ntfs_inode *ni = ntfs_i(inode);
763 loff_t vbo = iocb->ki_pos;
764 loff_t end;
765 int wr = iov_iter_rw(iter) & WRITE;
766 loff_t valid;
767 ssize_t ret;
768
769 if (is_resident(ni)) {
e8b8e97f 770 /* Switch to buffered write. */
82cae269
KK		 771 ret = 0;
772 goto out;
773 }
774
775 ret = blockdev_direct_IO(iocb, inode, iter,
776 wr ? ntfs_get_block_direct_IO_W
777 : ntfs_get_block_direct_IO_R);
778
779 if (ret <= 0)
780 goto out;
781
782 end = vbo + ret;
783 valid = ni->i_valid;
784 if (wr) {
785 if (end > valid && !S_ISBLK(inode->i_mode)) {
786 ni->i_valid = end;
787 mark_inode_dirty(inode);
788 }
789 } else if (vbo < valid && valid < end) {
e8b8e97f 790 /* Fix page. */
82cae269
KK		 791 iov_iter_revert(iter, end - valid);
792 iov_iter_zero(end - valid, iter);
793 }
794
795out:
796 return ret;
797}
798
799int ntfs_set_size(struct inode *inode, u64 new_size)
800{
801 struct super_block *sb = inode->i_sb;
802 struct ntfs_sb_info *sbi = sb->s_fs_info;
803 struct ntfs_inode *ni = ntfs_i(inode);
804 int err;
805
e8b8e97f 806 /* Check for maximum file size. */
82cae269
KK		 807 if (is_sparsed(ni) || is_compressed(ni)) {
808 if (new_size > sbi->maxbytes_sparse) {
809 err = -EFBIG;
810 goto out;
811 }
812 } else if (new_size > sbi->maxbytes) {
813 err = -EFBIG;
814 goto out;
815 }
816
817 ni_lock(ni);
818 down_write(&ni->file.run_lock);
819
820 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
821 &ni->i_valid, true, NULL);
822
823 up_write(&ni->file.run_lock);
824 ni_unlock(ni);
825
826 mark_inode_dirty(inode);
827
828out:
829 return err;
830}
831
832static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
833{
834 struct address_space *mapping = page->mapping;
835 struct inode *inode = mapping->host;
836 struct ntfs_inode *ni = ntfs_i(inode);
837 int err;
838
839 if (is_resident(ni)) {
840 ni_lock(ni);
841 err = attr_data_write_resident(ni, page);
842 ni_unlock(ni);
843 if (err != E_NTFS_NONRESIDENT) {
844 unlock_page(page);
845 return err;
846 }
847 }
848
849 return block_write_full_page(page, ntfs_get_block, wbc);
850}
851
852static int ntfs_writepages(struct address_space *mapping,
853 struct writeback_control *wbc)
854{
855 struct inode *inode = mapping->host;
856 struct ntfs_inode *ni = ntfs_i(inode);
e8b8e97f 857 /* Redirect call to 'ntfs_writepage' for resident files. */
82cae269
KK		 858 get_block_t *get_block = is_resident(ni) ? NULL : &ntfs_get_block;
859
860 return mpage_writepages(mapping, wbc, get_block);
861}
862
863static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
864 struct buffer_head *bh_result, int create)
865{
866 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
867 bh_result, create, GET_BLOCK_WRITE_BEGIN);
868}
869
870static int ntfs_write_begin(struct file *file, struct address_space *mapping,
871 loff_t pos, u32 len, u32 flags, struct page **pagep,
872 void **fsdata)
873{
874 int err;
875 struct inode *inode = mapping->host;
876 struct ntfs_inode *ni = ntfs_i(inode);
877
878 *pagep = NULL;
879 if (is_resident(ni)) {
880 struct page *page = grab_cache_page_write_begin(
881 mapping, pos >> PAGE_SHIFT, flags);
882
883 if (!page) {
884 err = -ENOMEM;
885 goto out;
886 }
887
888 ni_lock(ni);
889 err = attr_data_read_resident(ni, page);
890 ni_unlock(ni);
891
892 if (!err) {
893 *pagep = page;
894 goto out;
895 }
896 unlock_page(page);
897 put_page(page);
898
899 if (err != E_NTFS_NONRESIDENT)
900 goto out;
901 }
902
903 err = block_write_begin(mapping, pos, len, flags, pagep,
904 ntfs_get_block_write_begin);
905
906out:
907 return err;
908}
909
e8b8e97f
KA		 910/*
911 * ntfs_write_end - Address_space_operations::write_end.
912 */
82cae269
KK		 913static int ntfs_write_end(struct file *file, struct address_space *mapping,
914 loff_t pos, u32 len, u32 copied, struct page *page,
915 void *fsdata)
916
917{
918 struct inode *inode = mapping->host;
919 struct ntfs_inode *ni = ntfs_i(inode);
920 u64 valid = ni->i_valid;
921 bool dirty = false;
922 int err;
923
924 if (is_resident(ni)) {
925 ni_lock(ni);
926 err = attr_data_write_resident(ni, page);
927 ni_unlock(ni);
928 if (!err) {
929 dirty = true;
e8b8e97f 930 /* Clear any buffers in page. */
82cae269
KK		 931 if (page_has_buffers(page)) {
932 struct buffer_head *head, *bh;
933
934 bh = head = page_buffers(page);
935 do {
936 clear_buffer_dirty(bh);
937 clear_buffer_mapped(bh);
938 set_buffer_uptodate(bh);
939 } while (head != (bh = bh->b_this_page));
940 }
941 SetPageUptodate(page);
942 err = copied;
943 }
944 unlock_page(page);
945 put_page(page);
946 } else {
947 err = generic_write_end(file, mapping, pos, len, copied, page,
948 fsdata);
949 }
950
951 if (err >= 0) {
952 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
953 inode->i_ctime = inode->i_mtime = current_time(inode);
954 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
955 dirty = true;
956 }
957
958 if (valid != ni->i_valid) {
e8b8e97f 959 /* ni->i_valid is changed in ntfs_get_block_vbo. */
82cae269
KK		 960 dirty = true;
961 }
962
963 if (dirty)
964 mark_inode_dirty(inode);
965 }
966
967 return err;
968}
969
970int reset_log_file(struct inode *inode)
971{
972 int err;
973 loff_t pos = 0;
974 u32 log_size = inode->i_size;
975 struct address_space *mapping = inode->i_mapping;
976
977 for (;;) {
978 u32 len;
979 void *kaddr;
980 struct page *page;
981
982 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
983
984 err = block_write_begin(mapping, pos, len, 0, &page,
985 ntfs_get_block_write_begin);
986 if (err)
987 goto out;
988
989 kaddr = kmap_atomic(page);
990 memset(kaddr, -1, len);
991 kunmap_atomic(kaddr);
992 flush_dcache_page(page);
993
994 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
995 if (err < 0)
996 goto out;
997 pos += len;
998
999 if (pos >= log_size)
1000 break;
1001 balance_dirty_pages_ratelimited(mapping);
1002 }
1003out:
1004 mark_inode_dirty_sync(inode);
1005
1006 return err;
1007}
1008
1009int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1010{
1011 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1012}
1013
1014int ntfs_sync_inode(struct inode *inode)
1015{
1016 return _ni_write_inode(inode, 1);
1017}
1018
1019/*
e8b8e97f
KA		 1020 * writeback_inode - Helper function for ntfs_flush_inodes().
1021 *
1022 * This writes both the inode and the file data blocks, waiting
1023 * for in flight data blocks before the start of the call. It
1024 * does not wait for any io started during the call.
82cae269
KK		 1025 */
1026static int writeback_inode(struct inode *inode)
1027{
1028 int ret = sync_inode_metadata(inode, 0);
1029
1030 if (!ret)
1031 ret = filemap_fdatawrite(inode->i_mapping);
1032 return ret;
1033}
1034
1035/*
e8b8e97f
KA		 1036 * ntfs_flush_inodes
1037 *
1038 * Write data and metadata corresponding to i1 and i2. The io is
82cae269
KK		 1039 * started but we do not wait for any of it to finish.
1040 *
e8b8e97f 1041 * filemap_flush() is used for the block device, so if there is a dirty
82cae269 1042 * page for a block already in flight, we will not wait and start the
e8b8e97f 1043 * io over again.
82cae269
KK		 1044 */
1045int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1046 struct inode *i2)
1047{
1048 int ret = 0;
1049
1050 if (i1)
1051 ret = writeback_inode(i1);
1052 if (!ret && i2)
1053 ret = writeback_inode(i2);
1054 if (!ret)
1055 ret = filemap_flush(sb->s_bdev->bd_inode->i_mapping);
1056 return ret;
1057}
1058
1059int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1060{
1061 pgoff_t idx;
1062
e8b8e97f 1063 /* Write non resident data. */
82cae269
KK		 1064 for (idx = 0; bytes; idx++) {
1065 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1066 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1067
1068 if (IS_ERR(page))
1069 return PTR_ERR(page);
1070
1071 lock_page(page);
1072 WARN_ON(!PageUptodate(page));
1073 ClearPageUptodate(page);
1074
1075 memcpy(page_address(page), data, op);
1076
1077 flush_dcache_page(page);
1078 SetPageUptodate(page);
1079 unlock_page(page);
1080
1081 ntfs_unmap_page(page);
1082
1083 bytes -= op;
1084 data = Add2Ptr(data, PAGE_SIZE);
1085 }
1086 return 0;
1087}
1088
1089/*
e8b8e97f
KA		 1090 * ntfs_reparse_bytes
1091 *
d3624466 1092 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
e8b8e97f 1093 * for unicode string of @uni_len length.
82cae269
KK		 1094 */
1095static inline u32 ntfs_reparse_bytes(u32 uni_len)
1096{
e8b8e97f 1097 /* Header + unicode string + decorated unicode string. */
82cae269
KK		 1098 return sizeof(short) * (2 * uni_len + 4) +
1099 offsetof(struct REPARSE_DATA_BUFFER,
1100 SymbolicLinkReparseBuffer.PathBuffer);
1101}
1102
1103static struct REPARSE_DATA_BUFFER *
1104ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1105 u32 size, u16 *nsize)
1106{
1107 int i, err;
1108 struct REPARSE_DATA_BUFFER *rp;
1109 __le16 *rp_name;
1110 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1111
195c52bd 1112 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
82cae269
KK		 1113 if (!rp)
1114 return ERR_PTR(-ENOMEM);
1115
1116 rs = &rp->SymbolicLinkReparseBuffer;
1117 rp_name = rs->PathBuffer;
1118
e8b8e97f 1119 /* Convert link name to UTF-16. */
82cae269
KK		 1120 err = ntfs_nls_to_utf16(sbi, symname, size,
1121 (struct cpu_str *)(rp_name - 1), 2 * size,
1122 UTF16_LITTLE_ENDIAN);
1123 if (err < 0)
1124 goto out;
1125
e8b8e97f 1126 /* err = the length of unicode name of symlink. */
82cae269
KK		 1127 *nsize = ntfs_reparse_bytes(err);
1128
1129 if (*nsize > sbi->reparse.max_size) {
1130 err = -EFBIG;
1131 goto out;
1132 }
1133
e8b8e97f 1134 /* Translate Linux '/' into Windows '\'. */
82cae269
KK		 1135 for (i = 0; i < err; i++) {
1136 if (rp_name[i] == cpu_to_le16('/'))
1137 rp_name[i] = cpu_to_le16('\\');
1138 }
1139
1140 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1141 rp->ReparseDataLength =
1142 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1143 SymbolicLinkReparseBuffer));
1144
e8b8e97f 1145 /* PrintName + SubstituteName. */
82cae269
KK		 1146 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1147 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1148 rs->PrintNameLength = rs->SubstituteNameOffset;
1149
1150 /*
e8b8e97f
KA		 1151 * TODO: Use relative path if possible to allow Windows to
1152 * parse this path.
1153 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
82cae269
KK		 1154 */
1155 rs->Flags = 0;
1156
1157 memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1158
e8b8e97f 1159 /* Decorate SubstituteName. */
82cae269
KK		 1160 rp_name += err;
1161 rp_name[0] = cpu_to_le16('\\');
1162 rp_name[1] = cpu_to_le16('?');
1163 rp_name[2] = cpu_to_le16('?');
1164 rp_name[3] = cpu_to_le16('\\');
1165
1166 return rp;
1167out:
195c52bd 1168 kfree(rp);
82cae269
KK		 1169 return ERR_PTR(err);
1170}
1171
1172struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
1173 struct inode *dir, struct dentry *dentry,
1174 const struct cpu_str *uni, umode_t mode,
1175 dev_t dev, const char *symname, u32 size,
1176 struct ntfs_fnd *fnd)
1177{
1178 int err;
1179 struct super_block *sb = dir->i_sb;
1180 struct ntfs_sb_info *sbi = sb->s_fs_info;
1181 const struct qstr *name = &dentry->d_name;
1182 CLST ino = 0;
1183 struct ntfs_inode *dir_ni = ntfs_i(dir);
1184 struct ntfs_inode *ni = NULL;
1185 struct inode *inode = NULL;
1186 struct ATTRIB *attr;
1187 struct ATTR_STD_INFO5 *std5;
1188 struct ATTR_FILE_NAME *fname;
1189 struct MFT_REC *rec;
1190 u32 asize, dsize, sd_size;
1191 enum FILE_ATTRIBUTE fa;
1192 __le32 security_id = SECURITY_ID_INVALID;
1193 CLST vcn;
1194 const void *sd;
1195 u16 t16, nsize = 0, aid = 0;
1196 struct INDEX_ROOT *root, *dir_root;
1197 struct NTFS_DE *e, *new_de = NULL;
1198 struct REPARSE_DATA_BUFFER *rp = NULL;
1199 bool rp_inserted = false;
1200
d562e901
KK		 1201 ni_lock_dir(dir_ni);
1202
82cae269 1203 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
d562e901
KK		 1204 if (!dir_root) {
1205 err = -EINVAL;
1206 goto out1;
1207 }
82cae269
KK		 1208
1209 if (S_ISDIR(mode)) {
d3624466 1210 /* Use parent's directory attributes. */
82cae269
KK		 1211 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1212 FILE_ATTRIBUTE_ARCHIVE;
1213 /*
d3624466
KK		 1214 * By default child directory inherits parent attributes.
1215 * Root directory is hidden + system.
1216 * Make an exception for children in root.
82cae269
KK		 1217 */
1218 if (dir->i_ino == MFT_REC_ROOT)
1219 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1220 } else if (S_ISLNK(mode)) {
1221 /* It is good idea that link should be the same type (file/dir) as target */
1222 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1223
1224 /*
d3624466
KK		 1225 * Linux: there are dir/file/symlink and so on.
1226 * NTFS: symlinks are "dir + reparse" or "file + reparse"
82cae269
KK		 1227 * It is good idea to create:
1228 * dir + reparse if 'symname' points to directory
1229 * or
1230 * file + reparse if 'symname' points to file
e8b8e97f 1231 * Unfortunately kern_path hangs if symname contains 'dir'.
82cae269
KK		 1232 */
1233
1234 /*
1235 * struct path path;
1236 *
1237 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1238 * struct inode *target = d_inode(path.dentry);
1239 *
1240 * if (S_ISDIR(target->i_mode))
1241 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1242 * // if ( target->i_sb == sb ){
1243 * // use relative path?
1244 * // }
1245 * path_put(&path);
1246 * }
1247 */
1248 } else if (S_ISREG(mode)) {
564c97bd 1249 if (sbi->options->sparse) {
e8b8e97f 1250 /* Sparsed regular file, cause option 'sparse'. */
82cae269
KK		 1251 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1252 FILE_ATTRIBUTE_ARCHIVE;
1253 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
e8b8e97f 1254 /* Compressed regular file, if parent is compressed. */
82cae269
KK		 1255 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1256 } else {
e8b8e97f 1257 /* Regular file, default attributes. */
82cae269
KK		 1258 fa = FILE_ATTRIBUTE_ARCHIVE;
1259 }
1260 } else {
1261 fa = FILE_ATTRIBUTE_ARCHIVE;
1262 }
1263
1264 if (!(mode & 0222))
1265 fa |= FILE_ATTRIBUTE_READONLY;
1266
e8b8e97f 1267 /* Allocate PATH_MAX bytes. */
82cae269
KK		 1268 new_de = __getname();
1269 if (!new_de) {
1270 err = -ENOMEM;
1271 goto out1;
1272 }
1273
e8b8e97f 1274 /* Mark rw ntfs as dirty. it will be cleared at umount. */
82cae269
KK		 1275 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1276
e8b8e97f 1277 /* Step 1: allocate and fill new mft record. */
82cae269
KK		 1278 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1279 if (err)
1280 goto out2;
1281
1282 ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY);
1283 if (IS_ERR(ni)) {
1284 err = PTR_ERR(ni);
1285 ni = NULL;
1286 goto out3;
1287 }
1288 inode = &ni->vfs_inode;
1289 inode_init_owner(mnt_userns, inode, dir, mode);
78ab59fe 1290 mode = inode->i_mode;
82cae269
KK		 1291
1292 inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
1293 current_time(inode);
1294
1295 rec = ni->mi.mrec;
1296 rec->hard_links = cpu_to_le16(1);
1297 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1298
e8b8e97f 1299 /* Get default security id. */
82cae269
KK		 1300 sd = s_default_security;
1301 sd_size = sizeof(s_default_security);
1302
1303 if (is_ntfs3(sbi)) {
1304 security_id = dir_ni->std_security_id;
1305 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1306 security_id = sbi->security.def_security_id;
1307
1308 if (security_id == SECURITY_ID_INVALID &&
1309 !ntfs_insert_security(sbi, sd, sd_size,
1310 &security_id, NULL))
1311 sbi->security.def_security_id = security_id;
1312 }
1313 }
1314
e8b8e97f 1315 /* Insert standard info. */
82cae269
KK		 1316 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1317
1318 if (security_id == SECURITY_ID_INVALID) {
1319 dsize = sizeof(struct ATTR_STD_INFO);
1320 } else {
1321 dsize = sizeof(struct ATTR_STD_INFO5);
1322 std5->security_id = security_id;
1323 ni->std_security_id = security_id;
1324 }
1325 asize = SIZEOF_RESIDENT + dsize;
1326
1327 attr->type = ATTR_STD;
1328 attr->size = cpu_to_le32(asize);
1329 attr->id = cpu_to_le16(aid++);
1330 attr->res.data_off = SIZEOF_RESIDENT_LE;
1331 attr->res.data_size = cpu_to_le32(dsize);
1332
1333 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1334 kernel2nt(&inode->i_atime);
1335
1336 ni->std_fa = fa;
1337 std5->fa = fa;
1338
1339 attr = Add2Ptr(attr, asize);
1340
e8b8e97f 1341 /* Insert file name. */
82cae269
KK		 1342 err = fill_name_de(sbi, new_de, name, uni);
1343 if (err)
1344 goto out4;
1345
1346 mi_get_ref(&ni->mi, &new_de->ref);
1347
1348 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1349 mi_get_ref(&dir_ni->mi, &fname->home);
1350 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1351 fname->dup.a_time = std5->cr_time;
1352 fname->dup.alloc_size = fname->dup.data_size = 0;
1353 fname->dup.fa = std5->fa;
1354 fname->dup.ea_size = fname->dup.reparse = 0;
1355
1356 dsize = le16_to_cpu(new_de->key_size);
fa3cacf5 1357 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
82cae269
KK		 1358
1359 attr->type = ATTR_NAME;
1360 attr->size = cpu_to_le32(asize);
1361 attr->res.data_off = SIZEOF_RESIDENT_LE;
1362 attr->res.flags = RESIDENT_FLAG_INDEXED;
1363 attr->id = cpu_to_le16(aid++);
1364 attr->res.data_size = cpu_to_le32(dsize);
1365 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1366
1367 attr = Add2Ptr(attr, asize);
1368
1369 if (security_id == SECURITY_ID_INVALID) {
e8b8e97f 1370 /* Insert security attribute. */
fa3cacf5 1371 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
82cae269
KK		 1372
1373 attr->type = ATTR_SECURE;
1374 attr->size = cpu_to_le32(asize);
1375 attr->id = cpu_to_le16(aid++);
1376 attr->res.data_off = SIZEOF_RESIDENT_LE;
1377 attr->res.data_size = cpu_to_le32(sd_size);
1378 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1379
1380 attr = Add2Ptr(attr, asize);
1381 }
1382
78ab59fe 1383 attr->id = cpu_to_le16(aid++);
82cae269
KK		 1384 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1385 /*
e8b8e97f
KA		 1386 * Regular directory or symlink to directory.
1387 * Create root attribute.
82cae269
KK		 1388 */
1389 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1390 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1391
1392 attr->type = ATTR_ROOT;
1393 attr->size = cpu_to_le32(asize);
82cae269
KK		 1394
1395 attr->name_len = ARRAY_SIZE(I30_NAME);
1396 attr->name_off = SIZEOF_RESIDENT_LE;
1397 attr->res.data_off =
1398 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1399 attr->res.data_size = cpu_to_le32(dsize);
1400 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1401 sizeof(I30_NAME));
1402
1403 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1404 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1405 root->ihdr.de_off =
1406 cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10
1407 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1408 sizeof(struct NTFS_DE));
1409 root->ihdr.total = root->ihdr.used;
1410
1411 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1412 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1413 e->flags = NTFS_IE_LAST;
1414 } else if (S_ISLNK(mode)) {
1415 /*
e8b8e97f
KA		 1416 * Symlink to file.
1417 * Create empty resident data attribute.
82cae269
KK		 1418 */
1419 asize = SIZEOF_RESIDENT;
1420
e8b8e97f 1421 /* Insert empty ATTR_DATA */
82cae269
KK		 1422 attr->type = ATTR_DATA;
1423 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
82cae269
KK		 1424 attr->name_off = SIZEOF_RESIDENT_LE;
1425 attr->res.data_off = SIZEOF_RESIDENT_LE;
78ab59fe 1426 } else if (S_ISREG(mode)) {
82cae269 1427 /*
78ab59fe 1428 * Regular file. Create empty non resident data attribute.
82cae269
KK		 1429 */
1430 attr->type = ATTR_DATA;
78ab59fe
KK		 1431 attr->non_res = 1;
1432 attr->nres.evcn = cpu_to_le64(-1ll);
1433 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1434 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1435 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1436 attr->flags = ATTR_FLAG_SPARSED;
1437 asize = SIZEOF_NONRESIDENT_EX + 8;
1438 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1439 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1440 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1441 attr->flags = ATTR_FLAG_COMPRESSED;
1442 attr->nres.c_unit = COMPRESSION_UNIT;
1443 asize = SIZEOF_NONRESIDENT_EX + 8;
82cae269 1444 } else {
78ab59fe
KK		 1445 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1446 attr->name_off = SIZEOF_NONRESIDENT_LE;
1447 asize = SIZEOF_NONRESIDENT + 8;
82cae269 1448 }
78ab59fe
KK		 1449 attr->nres.run_off = attr->name_off;
1450 } else {
1451 /*
1452 * Node. Create empty resident data attribute.
1453 */
1454 attr->type = ATTR_DATA;
1455 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1456 attr->name_off = SIZEOF_RESIDENT_LE;
1457 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1458 attr->flags = ATTR_FLAG_SPARSED;
1459 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1460 attr->flags = ATTR_FLAG_COMPRESSED;
1461 attr->res.data_off = SIZEOF_RESIDENT_LE;
1462 asize = SIZEOF_RESIDENT;
1463 ni->ni_flags |= NI_FLAG_RESIDENT;
82cae269
KK		 1464 }
1465
1466 if (S_ISDIR(mode)) {
1467 ni->ni_flags |= NI_FLAG_DIR;
1468 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1469 if (err)
1470 goto out4;
1471 } else if (S_ISLNK(mode)) {
1472 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1473
1474 if (IS_ERR(rp)) {
1475 err = PTR_ERR(rp);
1476 rp = NULL;
1477 goto out4;
1478 }
1479
1480 /*
e8b8e97f 1481 * Insert ATTR_REPARSE.
82cae269
KK		 1482 */
1483 attr = Add2Ptr(attr, asize);
1484 attr->type = ATTR_REPARSE;
1485 attr->id = cpu_to_le16(aid++);
1486
e8b8e97f 1487 /* Resident or non resident? */
fa3cacf5 1488 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
82cae269
KK		 1489 t16 = PtrOffset(rec, attr);
1490
78ab59fe
KK		 1491 /* 0x78 - the size of EA + EAINFO to store WSL */
1492 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
82cae269
KK		 1493 CLST alen;
1494 CLST clst = bytes_to_cluster(sbi, nsize);
1495
e8b8e97f 1496 /* Bytes per runs. */
82cae269
KK		 1497 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1498
1499 attr->non_res = 1;
1500 attr->nres.evcn = cpu_to_le64(clst - 1);
1501 attr->name_off = SIZEOF_NONRESIDENT_LE;
1502 attr->nres.run_off = attr->name_off;
1503 attr->nres.data_size = cpu_to_le64(nsize);
1504 attr->nres.valid_size = attr->nres.data_size;
1505 attr->nres.alloc_size =
1506 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1507
1508 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1509 clst, NULL, 0, &alen, 0,
1510 NULL);
1511 if (err)
1512 goto out5;
1513
1514 err = run_pack(&ni->file.run, 0, clst,
1515 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1516 &vcn);
1517 if (err < 0)
1518 goto out5;
1519
1520 if (vcn != clst) {
1521 err = -EINVAL;
1522 goto out5;
1523 }
1524
fa3cacf5 1525 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
82cae269
KK		 1526 inode->i_size = nsize;
1527 } else {
1528 attr->res.data_off = SIZEOF_RESIDENT_LE;
1529 attr->res.data_size = cpu_to_le32(nsize);
1530 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1531 inode->i_size = nsize;
1532 nsize = 0;
1533 }
1534
1535 attr->size = cpu_to_le32(asize);
1536
1537 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1538 &new_de->ref);
1539 if (err)
1540 goto out5;
1541
1542 rp_inserted = true;
1543 }
1544
1545 attr = Add2Ptr(attr, asize);
1546 attr->type = ATTR_END;
1547
1548 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1549 rec->next_attr_id = cpu_to_le16(aid);
1550
e8b8e97f 1551 /* Step 2: Add new name in index. */
78ab59fe 1552 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
82cae269
KK		 1553 if (err)
1554 goto out6;
1555
d562e901
KK		 1556 /* Unlock parent directory before ntfs_init_acl. */
1557 ni_unlock(dir_ni);
1558
82cae269
KK		 1559 inode->i_generation = le16_to_cpu(rec->seq);
1560
1561 dir->i_mtime = dir->i_ctime = inode->i_atime;
1562
1563 if (S_ISDIR(mode)) {
82cae269
KK		 1564 inode->i_op = &ntfs_dir_inode_operations;
1565 inode->i_fop = &ntfs_dir_operations;
1566 } else if (S_ISLNK(mode)) {
1567 inode->i_op = &ntfs_link_inode_operations;
1568 inode->i_fop = NULL;
1569 inode->i_mapping->a_ops = &ntfs_aops;
1570 } else if (S_ISREG(mode)) {
1571 inode->i_op = &ntfs_file_inode_operations;
1572 inode->i_fop = &ntfs_file_operations;
1573 inode->i_mapping->a_ops =
1574 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
1575 init_rwsem(&ni->file.run_lock);
1576 } else {
1577 inode->i_op = &ntfs_special_inode_operations;
1578 init_special_inode(inode, mode, dev);
1579 }
1580
1581#ifdef CONFIG_NTFS3_FS_POSIX_ACL
1582 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1583 err = ntfs_init_acl(mnt_userns, inode, dir);
1584 if (err)
6c1ee4d3 1585 goto out7;
82cae269
KK		 1586 } else
1587#endif
1588 {
1589 inode->i_flags |= S_NOSEC;
1590 }
1591
e8b8e97f 1592 /* Write non resident data. */
82cae269 1593 if (nsize) {
63544672 1594 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0);
82cae269
KK		 1595 if (err)
1596 goto out7;
1597 }
1598
e8b8e97f
KA		 1599 /*
1600 * Call 'd_instantiate' after inode->i_op is set
1601 * but before finish_open.
1602 */
82cae269
KK		 1603 d_instantiate(dentry, inode);
1604
1605 ntfs_save_wsl_perm(inode);
82cae269 1606 mark_inode_dirty(dir);
78ab59fe 1607 mark_inode_dirty(inode);
82cae269 1608
e8b8e97f 1609 /* Normal exit. */
82cae269
KK		 1610 goto out2;
1611
1612out7:
1613
e8b8e97f 1614 /* Undo 'indx_insert_entry'. */
d562e901 1615 ni_lock_dir(dir_ni);
82cae269
KK		 1616 indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
1617 le16_to_cpu(new_de->key_size), sbi);
d562e901 1618 /* ni_unlock(dir_ni); will be called later. */
82cae269
KK		 1619out6:
1620 if (rp_inserted)
1621 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1622
1623out5:
1624 if (S_ISDIR(mode) || run_is_empty(&ni->file.run))
1625 goto out4;
1626
1627 run_deallocate(sbi, &ni->file.run, false);
1628
1629out4:
1630 clear_rec_inuse(rec);
1631 clear_nlink(inode);
1632 ni->mi.dirty = false;
1633 discard_new_inode(inode);
1634out3:
1635 ntfs_mark_rec_free(sbi, ino);
1636
1637out2:
1638 __putname(new_de);
195c52bd 1639 kfree(rp);
82cae269
KK		 1640
1641out1:
d562e901
KK		 1642 if (err) {
1643 ni_unlock(dir_ni);
82cae269 1644 return ERR_PTR(err);
d562e901 1645 }
82cae269
KK		 1646
1647 unlock_new_inode(inode);
1648
1649 return inode;
1650}
1651
1652int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1653{
1654 int err;
82cae269 1655 struct ntfs_inode *ni = ntfs_i(inode);
78ab59fe
KK		 1656 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1657 struct NTFS_DE *de;
1658 struct ATTR_FILE_NAME *de_name;
82cae269 1659
e8b8e97f 1660 /* Allocate PATH_MAX bytes. */
78ab59fe
KK		 1661 de = __getname();
1662 if (!de)
82cae269
KK		 1663 return -ENOMEM;
1664
78ab59fe
KK		 1665 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1666 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
82cae269 1667
78ab59fe
KK		 1668 /* Construct 'de'. */
1669 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
82cae269
KK		 1670 if (err)
1671 goto out;
1672
78ab59fe
KK		 1673 de_name = (struct ATTR_FILE_NAME *)(de + 1);
1674 /* Fill duplicate info. */
1675 de_name->dup.cr_time = de_name->dup.m_time = de_name->dup.c_time =
1676 de_name->dup.a_time = kernel2nt(&inode->i_ctime);
1677 de_name->dup.alloc_size = de_name->dup.data_size =
1678 cpu_to_le64(inode->i_size);
1679 de_name->dup.fa = ni->std_fa;
1680 de_name->dup.ea_size = de_name->dup.reparse = 0;
82cae269 1681
78ab59fe 1682 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
82cae269 1683out:
78ab59fe 1684 __putname(de);
82cae269
KK		 1685 return err;
1686}
1687
1688/*
1689 * ntfs_unlink_inode
1690 *
1691 * inode_operations::unlink
1692 * inode_operations::rmdir
1693 */
1694int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1695{
1696 int err;
78ab59fe 1697 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
82cae269
KK		 1698 struct inode *inode = d_inode(dentry);
1699 struct ntfs_inode *ni = ntfs_i(inode);
82cae269 1700 struct ntfs_inode *dir_ni = ntfs_i(dir);
78ab59fe
KK		 1701 struct NTFS_DE *de, *de2 = NULL;
1702 int undo_remove;
82cae269 1703
78ab59fe 1704 if (ntfs_is_meta_file(sbi, ni->mi.rno))
82cae269
KK		 1705 return -EINVAL;
1706
78ab59fe
KK		 1707 /* Allocate PATH_MAX bytes. */
1708 de = __getname();
1709 if (!de)
1710 return -ENOMEM;
1711
82cae269
KK		 1712 ni_lock(ni);
1713
78ab59fe 1714 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
82cae269 1715 err = -ENOTEMPTY;
78ab59fe 1716 goto out;
82cae269
KK		 1717 }
1718
78ab59fe 1719 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
82cae269 1720 if (err < 0)
78ab59fe 1721 goto out;
82cae269 1722
78ab59fe
KK		 1723 undo_remove = 0;
1724 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
82cae269 1725
78ab59fe 1726 if (!err) {
82cae269 1727 drop_nlink(inode);
78ab59fe
KK		 1728 dir->i_mtime = dir->i_ctime = current_time(dir);
1729 mark_inode_dirty(dir);
1730 inode->i_ctime = dir->i_ctime;
1731 if (inode->i_nlink)
1732 mark_inode_dirty(inode);
1733 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
82cae269 1734 make_bad_inode(inode);
78ab59fe
KK		 1735 ntfs_inode_err(inode, "failed to undo unlink");
1736 ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
1737 } else {
1738 if (ni_is_dirty(dir))
1739 mark_inode_dirty(dir);
1740 if (ni_is_dirty(inode))
1741 mark_inode_dirty(inode);
82cae269
KK		 1742 }
1743
78ab59fe 1744out:
82cae269 1745 ni_unlock(ni);
78ab59fe 1746 __putname(de);
82cae269
KK		 1747 return err;
1748}
1749
1750void ntfs_evict_inode(struct inode *inode)
1751{
1752 truncate_inode_pages_final(&inode->i_data);
1753
1754 if (inode->i_nlink)
1755 _ni_write_inode(inode, inode_needs_sync(inode));
1756
1757 invalidate_inode_buffers(inode);
1758 clear_inode(inode);
1759
1760 ni_clear(ntfs_i(inode));
1761}
1762
1763static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer,
1764 int buflen)
1765{
4dbe8e44 1766 int i, err = -EINVAL;
82cae269
KK		 1767 struct ntfs_inode *ni = ntfs_i(inode);
1768 struct super_block *sb = inode->i_sb;
1769 struct ntfs_sb_info *sbi = sb->s_fs_info;
4dbe8e44
KK		 1770 u64 size;
1771 u16 ulen = 0;
82cae269
KK		 1772 void *to_free = NULL;
1773 struct REPARSE_DATA_BUFFER *rp;
4dbe8e44 1774 const __le16 *uname;
82cae269
KK		 1775 struct ATTRIB *attr;
1776
e8b8e97f 1777 /* Reparse data present. Try to parse it. */
82cae269
KK		 1778 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1779 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1780
1781 *buffer = 0;
1782
82cae269 1783 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
4dbe8e44 1784 if (!attr)
82cae269 1785 goto out;
82cae269
KK		 1786
1787 if (!attr->non_res) {
4dbe8e44
KK		 1788 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1789 if (!rp)
82cae269 1790 goto out;
4dbe8e44 1791 size = le32_to_cpu(attr->res.data_size);
82cae269 1792 } else {
4dbe8e44
KK		 1793 size = le64_to_cpu(attr->nres.data_size);
1794 rp = NULL;
1795 }
1796
1797 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1798 goto out;
1799
1800 if (!rp) {
1801 rp = kmalloc(size, GFP_NOFS);
82cae269
KK		 1802 if (!rp) {
1803 err = -ENOMEM;
1804 goto out;
1805 }
1806 to_free = rp;
4dbe8e44
KK		 1807 /* Read into temporal buffer. */
1808 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
82cae269
KK		 1809 if (err)
1810 goto out;
1811 }
1812
e8b8e97f 1813 /* Microsoft Tag. */
82cae269
KK		 1814 switch (rp->ReparseTag) {
1815 case IO_REPARSE_TAG_MOUNT_POINT:
e8b8e97f 1816 /* Mount points and junctions. */
82cae269 1817 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
4dbe8e44
KK		 1818 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1819 MountPointReparseBuffer.PathBuffer))
82cae269 1820 goto out;
4dbe8e44
KK		 1821 uname = Add2Ptr(rp,
1822 offsetof(struct REPARSE_DATA_BUFFER,
1823 MountPointReparseBuffer.PathBuffer) +
1824 le16_to_cpu(rp->MountPointReparseBuffer
1825 .PrintNameOffset));
1826 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
82cae269
KK		 1827 break;
1828
1829 case IO_REPARSE_TAG_SYMLINK:
1830 /* FolderSymbolicLink */
1831 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
4dbe8e44
KK		 1832 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1833 SymbolicLinkReparseBuffer.PathBuffer))
82cae269 1834 goto out;
4dbe8e44
KK		 1835 uname = Add2Ptr(
1836 rp, offsetof(struct REPARSE_DATA_BUFFER,
1837 SymbolicLinkReparseBuffer.PathBuffer) +
1838 le16_to_cpu(rp->SymbolicLinkReparseBuffer
1839 .PrintNameOffset));
1840 ulen = le16_to_cpu(
82cae269
KK		 1841 rp->SymbolicLinkReparseBuffer.PrintNameLength);
1842 break;
1843
1844 case IO_REPARSE_TAG_CLOUD:
1845 case IO_REPARSE_TAG_CLOUD_1:
1846 case IO_REPARSE_TAG_CLOUD_2:
1847 case IO_REPARSE_TAG_CLOUD_3:
1848 case IO_REPARSE_TAG_CLOUD_4:
1849 case IO_REPARSE_TAG_CLOUD_5:
1850 case IO_REPARSE_TAG_CLOUD_6:
1851 case IO_REPARSE_TAG_CLOUD_7:
1852 case IO_REPARSE_TAG_CLOUD_8:
1853 case IO_REPARSE_TAG_CLOUD_9:
1854 case IO_REPARSE_TAG_CLOUD_A:
1855 case IO_REPARSE_TAG_CLOUD_B:
1856 case IO_REPARSE_TAG_CLOUD_C:
1857 case IO_REPARSE_TAG_CLOUD_D:
1858 case IO_REPARSE_TAG_CLOUD_E:
1859 case IO_REPARSE_TAG_CLOUD_F:
1860 err = sizeof("OneDrive") - 1;
1861 if (err > buflen)
1862 err = buflen;
1863 memcpy(buffer, "OneDrive", err);
1864 goto out;
1865
1866 default:
1867 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
d3624466 1868 /* Unknown Microsoft Tag. */
82cae269
KK		 1869 goto out;
1870 }
1871 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
4dbe8e44 1872 size <= sizeof(struct REPARSE_POINT)) {
82cae269
KK		 1873 goto out;
1874 }
1875
e8b8e97f 1876 /* Users tag. */
4dbe8e44
KK		 1877 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
1878 ulen = le16_to_cpu(rp->ReparseDataLength) -
82cae269
KK		 1879 sizeof(struct REPARSE_POINT);
1880 }
1881
e8b8e97f 1882 /* Convert nlen from bytes to UNICODE chars. */
4dbe8e44 1883 ulen >>= 1;
82cae269 1884
e8b8e97f 1885 /* Check that name is available. */
4dbe8e44 1886 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
82cae269
KK		 1887 goto out;
1888
e8b8e97f 1889 /* If name is already zero terminated then truncate it now. */
4dbe8e44
KK		 1890 if (!uname[ulen - 1])
1891 ulen -= 1;
82cae269 1892
4dbe8e44 1893 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
82cae269
KK		 1894
1895 if (err < 0)
1896 goto out;
1897
e8b8e97f 1898 /* Translate Windows '\' into Linux '/'. */
82cae269
KK		 1899 for (i = 0; i < err; i++) {
1900 if (buffer[i] == '\\')
1901 buffer[i] = '/';
1902 }
1903
e8b8e97f 1904 /* Always set last zero. */
82cae269
KK		 1905 buffer[err] = 0;
1906out:
195c52bd 1907 kfree(to_free);
82cae269
KK		 1908 return err;
1909}
1910
1911static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
1912 struct delayed_call *done)
1913{
1914 int err;
1915 char *ret;
1916
1917 if (!de)
1918 return ERR_PTR(-ECHILD);
1919
1920 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
1921 if (!ret)
1922 return ERR_PTR(-ENOMEM);
1923
1924 err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE);
1925 if (err < 0) {
1926 kfree(ret);
1927 return ERR_PTR(err);
1928 }
1929
1930 set_delayed_call(done, kfree_link, ret);
1931
1932 return ret;
1933}
1934
1935// clang-format off
1936const struct inode_operations ntfs_link_inode_operations = {
1937 .get_link = ntfs_get_link,
1938 .setattr = ntfs3_setattr,
1939 .listxattr = ntfs_listxattr,
1940 .permission = ntfs_permission,
1941 .get_acl = ntfs_get_acl,
1942 .set_acl = ntfs_set_acl,
1943};
1944
1945const struct address_space_operations ntfs_aops = {
1946 .readpage = ntfs_readpage,
1947 .readahead = ntfs_readahead,
1948 .writepage = ntfs_writepage,
1949 .writepages = ntfs_writepages,
1950 .write_begin = ntfs_write_begin,
1951 .write_end = ntfs_write_end,
1952 .direct_IO = ntfs_direct_IO,
1953 .bmap = ntfs_bmap,
1954 .set_page_dirty = __set_page_dirty_buffers,
1955};
1956
1957const struct address_space_operations ntfs_aops_cmpr = {
1958 .readpage = ntfs_readpage,
1959 .readahead = ntfs_readahead,
1960};
1961// clang-format on
Linux 6.x block layer and io_uring tree(s)