1	// SPDX-License-Identifier: GPL-2.0
2	/*
3	*
4	* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
5	*
6	*/
7
8	#include <linux/buffer_head.h>
9	#include <linux/fs.h>
10	#include <linux/mpage.h>
11	#include <linux/namei.h>
12	#include <linux/nls.h>
13	#include <linux/uio.h>
14	#include <linux/writeback.h>
15
16	#include "debug.h"
17	#include "ntfs.h"
18	#include "ntfs_fs.h"
19
20	/*
21	* ntfs_read_mft - Read record and parse MFT.
22	*/
23	static struct inode *ntfs_read_mft(struct inode *inode,
24	const struct cpu_str *name,
25	const struct MFT_REF *ref)
26	{
27	int err = 0;
28	struct ntfs_inode *ni = ntfs_i(inode);
29	struct super_block *sb = inode->i_sb;
30	struct ntfs_sb_info *sbi = sb->s_fs_info;
31	mode_t mode = 0;
32	struct ATTR_STD_INFO5 *std5 = NULL;
33	struct ATTR_LIST_ENTRY *le;
34	struct ATTRIB *attr;
35	bool is_match = false;
36	bool is_root = false;
37	bool is_dir;
38	unsigned long ino = inode->i_ino;
39	u32 rp_fa = 0, asize, t32;
40	u16 roff, rsize, names = 0, links = 0;
41	const struct ATTR_FILE_NAME *fname = NULL;
42	const struct INDEX_ROOT *root;
43	struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
44	u64 t64;
45	struct MFT_REC *rec;
46	struct runs_tree *run;
47	struct timespec64 ts;
48
49	inode->i_op = NULL;
50	/* Setup 'uid' and 'gid' */
51	inode->i_uid = sbi->options->fs_uid;
52	inode->i_gid = sbi->options->fs_gid;
53
54	err = mi_init(mi: &ni->mi, sbi, rno: ino);
55	if (err)
56	goto out;
57
58	if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
59	t64 = sbi->mft.lbo >> sbi->cluster_bits;
60	t32 = bytes_to_cluster(sbi, size: MFT_REC_VOL * sbi->record_size);
61	sbi->mft.ni = ni;
62	init_rwsem(&ni->file.run_lock);
63
64	if (!run_add_entry(run: &ni->file.run, vcn: 0, lcn: t64, len: t32, is_mft: true)) {
65	err = -ENOMEM;
66	goto out;
67	}
68	}
69
70	err = mi_read(mi: &ni->mi, is_mft: ino == MFT_REC_MFT);
71
72	if (err)
73	goto out;
74
75	rec = ni->mi.mrec;
76
77	if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
78	;
79	} else if (ref->seq != rec->seq) {
80	err = -EINVAL;
81	ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
82	le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
83	goto out;
84	} else if (!is_rec_inuse(rec)) {
85	err = -ESTALE;
86	ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
87	goto out;
88	}
89
90	if (le32_to_cpu(rec->total) != sbi->record_size) {
91	/* Bad inode? */
92	err = -EINVAL;
93	goto out;
94	}
95
96	if (!is_rec_base(rec)) {
97	err = -EINVAL;
98	goto out;
99	}
100
101	/* Record should contain $I30 root. */
102	is_dir = rec->flags & RECORD_FLAG_DIR;
103
104	/* MFT_REC_MFT is not a dir */
105	if (is_dir && ino == MFT_REC_MFT) {
106	err = -EINVAL;
107	goto out;
108	}
109
110	inode->i_generation = le16_to_cpu(rec->seq);
111
112	/* Enumerate all struct Attributes MFT. */
113	le = NULL;
114	attr = NULL;
115
116	/*
117	* To reduce tab pressure use goto instead of
118	* while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
119	*/
120	next_attr:
121	run = NULL;
122	err = -EINVAL;
123	attr = ni_enum_attr_ex(ni, attr, le: &le, NULL);
124	if (!attr)
125	goto end_enum;
126
127	if (le && le->vcn) {
128	/* This is non primary attribute segment. Ignore if not MFT. */
129	if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
130	goto next_attr;
131
132	run = &ni->file.run;
133	asize = le32_to_cpu(attr->size);
134	goto attr_unpack_run;
135	}
136
137	roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
138	rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
139	asize = le32_to_cpu(attr->size);
140
141	/*
142	* Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'.
143	* There not critical to check this case again
144	*/
145	if (attr->name_len &&
146	sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) >
147	asize)
148	goto out;
149
150	if (attr->non_res) {
151	t64 = le64_to_cpu(attr->nres.alloc_size);
152	if (le64_to_cpu(attr->nres.data_size) > t64 ||
153	le64_to_cpu(attr->nres.valid_size) > t64)
154	goto out;
155	}
156
157	switch (attr->type) {
158	case ATTR_STD:
159	if (attr->non_res ||
160	asize < sizeof(struct ATTR_STD_INFO) + roff ||
161	rsize < sizeof(struct ATTR_STD_INFO))
162	goto out;
163
164	if (std5)
165	goto next_attr;
166
167	std5 = Add2Ptr(attr, roff);
168
169	#ifdef STATX_BTIME
170	nt2kernel(tm: std5->cr_time, ts: &ni->i_crtime);
171	#endif
172	nt2kernel(tm: std5->a_time, ts: &ts);
173	inode_set_atime_to_ts(inode, ts);
174	nt2kernel(tm: std5->c_time, ts: &ts);
175	inode_set_ctime_to_ts(inode, ts);
176	nt2kernel(tm: std5->m_time, ts: &ts);
177	inode_set_mtime_to_ts(inode, ts);
178
179	ni->std_fa = std5->fa;
180
181	if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
182	rsize >= sizeof(struct ATTR_STD_INFO5))
183	ni->std_security_id = std5->security_id;
184	goto next_attr;
185
186	case ATTR_LIST:
187	if (attr->name_len || le || ino == MFT_REC_LOG)
188	goto out;
189
190	err = ntfs_load_attr_list(ni, attr);
191	if (err)
192	goto out;
193
194	le = NULL;
195	attr = NULL;
196	goto next_attr;
197
198	case ATTR_NAME:
199	if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
200	rsize < SIZEOF_ATTRIBUTE_FILENAME)
201	goto out;
202
203	names += 1;
204	fname = Add2Ptr(attr, roff);
205	if (fname->type == FILE_NAME_DOS)
206	goto next_attr;
207
208	links += 1;
209	if (name && name->len == fname->name_len &&
210	!ntfs_cmp_names_cpu(uni1: name, uni2: (struct le_str *)&fname->name_len,
211	NULL, bothcase: false))
212	is_match = true;
213
214	goto next_attr;
215
216	case ATTR_DATA:
217	if (is_dir) {
218	/* Ignore data attribute in dir record. */
219	goto next_attr;
220	}
221
222	if (ino == MFT_REC_BADCLUST && !attr->non_res)
223	goto next_attr;
224
225	if (attr->name_len &&
226	((ino != MFT_REC_BADCLUST || !attr->non_res ||
227	attr->name_len != ARRAY_SIZE(BAD_NAME) ||
228	memcmp(p: attr_name(attr), q: BAD_NAME, size: sizeof(BAD_NAME))) &&
229	(ino != MFT_REC_SECURE || !attr->non_res ||
230	attr->name_len != ARRAY_SIZE(SDS_NAME) ||
231	memcmp(p: attr_name(attr), q: SDS_NAME, size: sizeof(SDS_NAME))))) {
232	/* File contains stream attribute. Ignore it. */
233	goto next_attr;
234	}
235
236	if (is_attr_sparsed(attr))
237	ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
238	else
239	ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
240
241	if (is_attr_compressed(attr))
242	ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
243	else
244	ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
245
246	if (is_attr_encrypted(attr))
247	ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
248	else
249	ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
250
251	if (!attr->non_res) {
252	ni->i_valid = inode->i_size = rsize;
253	inode_set_bytes(inode, bytes: rsize);
254	}
255
256	mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
257
258	if (!attr->non_res) {
259	ni->ni_flags |= NI_FLAG_RESIDENT;
260	goto next_attr;
261	}
262
263	inode_set_bytes(inode, bytes: attr_ondisk_size(attr));
264
265	ni->i_valid = le64_to_cpu(attr->nres.valid_size);
266	inode->i_size = le64_to_cpu(attr->nres.data_size);
267	if (!attr->nres.alloc_size)
268	goto next_attr;
269
270	run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
271	&ni->file.run;
272	break;
273
274	case ATTR_ROOT:
275	if (attr->non_res)
276	goto out;
277
278	root = Add2Ptr(attr, roff);
279
280	if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
281	memcmp(p: attr_name(attr), q: I30_NAME, size: sizeof(I30_NAME)))
282	goto next_attr;
283
284	if (root->type != ATTR_NAME ||
285	root->rule != NTFS_COLLATION_TYPE_FILENAME)
286	goto out;
287
288	if (!is_dir)
289	goto next_attr;
290
291	is_root = true;
292	ni->ni_flags |= NI_FLAG_DIR;
293
294	err = indx_init(indx: &ni->dir, sbi, attr, type: INDEX_MUTEX_I30);
295	if (err)
296	goto out;
297
298	mode = sb->s_root ?
299	(S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
300	(S_IFDIR | 0777);
301	goto next_attr;
302
303	case ATTR_ALLOC:
304	if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
305	memcmp(p: attr_name(attr), q: I30_NAME, size: sizeof(I30_NAME)))
306	goto next_attr;
307
308	inode->i_size = le64_to_cpu(attr->nres.data_size);
309	ni->i_valid = le64_to_cpu(attr->nres.valid_size);
310	inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
311
312	run = &ni->dir.alloc_run;
313	break;
314
315	case ATTR_BITMAP:
316	if (ino == MFT_REC_MFT) {
317	if (!attr->non_res)
318	goto out;
319	#ifndef CONFIG_NTFS3_64BIT_CLUSTER
320	/* 0x20000000 = 2^32 / 8 */
321	if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
322	goto out;
323	#endif
324	run = &sbi->mft.bitmap.run;
325	break;
326	} else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
327	!memcmp(p: attr_name(attr), q: I30_NAME,
328	size: sizeof(I30_NAME)) &&
329	attr->non_res) {
330	run = &ni->dir.bitmap_run;
331	break;
332	}
333	goto next_attr;
334
335	case ATTR_REPARSE:
336	if (attr->name_len)
337	goto next_attr;
338
339	rp_fa = ni_parse_reparse(ni, attr, buffer: &rp);
340	switch (rp_fa) {
341	case REPARSE_LINK:
342	/*
343	* Normal symlink.
344	* Assume one unicode symbol == one utf8.
345	*/
346	inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
347	.PrintNameLength) /
348	sizeof(u16);
349	ni->i_valid = inode->i_size;
350	/* Clear directory bit. */
351	if (ni->ni_flags & NI_FLAG_DIR) {
352	indx_clear(idx: &ni->dir);
353	memset(&ni->dir, 0, sizeof(ni->dir));
354	ni->ni_flags &= ~NI_FLAG_DIR;
355	} else {
356	run_close(run: &ni->file.run);
357	}
358	mode = S_IFLNK | 0777;
359	is_dir = false;
360	if (attr->non_res) {
361	run = &ni->file.run;
362	goto attr_unpack_run; // Double break.
363	}
364	break;
365
366	case REPARSE_COMPRESSED:
367	break;
368
369	case REPARSE_DEDUPLICATED:
370	break;
371	}
372	goto next_attr;
373
374	case ATTR_EA_INFO:
375	if (!attr->name_len &&
376	resident_data_ex(attr, datasize: sizeof(struct EA_INFO))) {
377	ni->ni_flags |= NI_FLAG_EA;
378	/*
379	* ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
380	*/
381	inode->i_mode = mode;
382	ntfs_get_wsl_perm(inode);
383	mode = inode->i_mode;
384	}
385	goto next_attr;
386
387	default:
388	goto next_attr;
389	}
390
391	attr_unpack_run:
392	roff = le16_to_cpu(attr->nres.run_off);
393
394	if (roff > asize) {
395	err = -EINVAL;
396	goto out;
397	}
398
399	t64 = le64_to_cpu(attr->nres.svcn);
400
401	err = run_unpack_ex(run, sbi, ino, svcn: t64, le64_to_cpu(attr->nres.evcn),
402	vcn: t64, Add2Ptr(attr, roff), run_buf_size: asize - roff);
403	if (err < 0)
404	goto out;
405	err = 0;
406	goto next_attr;
407
408	end_enum:
409
410	if (!std5)
411	goto out;
412
413	if (is_bad_inode(inode))
414	goto out;
415
416	if (!is_match && name) {
417	err = -ENOENT;
418	goto out;
419	}
420
421	if (std5->fa & FILE_ATTRIBUTE_READONLY)
422	mode &= ~0222;
423
424	if (!names) {
425	err = -EINVAL;
426	goto out;
427	}
428
429	if (names != le16_to_cpu(rec->hard_links)) {
430	/* Correct minor error on the fly. Do not mark inode as dirty. */
431	ntfs_inode_warn(inode, "Correct links count -> %u.", names);
432	rec->hard_links = cpu_to_le16(names);
433	ni->mi.dirty = true;
434	}
435
436	set_nlink(inode, nlink: links);
437
438	if (S_ISDIR(mode)) {
439	ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
440
441	/*
442	* Dot and dot-dot should be included in count but was not
443	* included in enumeration.
444	* Usually a hard links to directories are disabled.
445	*/
446	inode->i_op = &ntfs_dir_inode_operations;
447	inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
448	&ntfs_legacy_dir_operations :
449	&ntfs_dir_operations;
450	ni->i_valid = 0;
451	} else if (S_ISLNK(mode)) {
452	ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
453	inode->i_op = &ntfs_link_inode_operations;
454	inode->i_fop = NULL;
455	inode_nohighmem(inode);
456	} else if (S_ISREG(mode)) {
457	ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
458	inode->i_op = &ntfs_file_inode_operations;
459	inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
460	&ntfs_legacy_file_operations :
461	&ntfs_file_operations;
462	inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
463	&ntfs_aops;
464	if (ino != MFT_REC_MFT)
465	init_rwsem(&ni->file.run_lock);
466	} else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
467	S_ISSOCK(mode)) {
468	inode->i_op = &ntfs_special_inode_operations;
469	init_special_inode(inode, mode, inode->i_rdev);
470	} else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
471	fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
472	/* Records in $Extend are not a files or general directories. */
473	inode->i_op = &ntfs_file_inode_operations;
474	mode = S_IFREG;
475	init_rwsem(&ni->file.run_lock);
476	} else {
477	err = -EINVAL;
478	goto out;
479	}
480
481	if ((sbi->options->sys_immutable &&
482	(std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
483	!S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
484	inode->i_flags |= S_IMMUTABLE;
485	} else {
486	inode->i_flags &= ~S_IMMUTABLE;
487	}
488
489	inode->i_mode = mode;
490	if (!(ni->ni_flags & NI_FLAG_EA)) {
491	/* If no xattr then no security (stored in xattr). */
492	inode->i_flags |= S_NOSEC;
493	}
494
495	if (ino == MFT_REC_MFT && !sb->s_root)
496	sbi->mft.ni = NULL;
497
498	unlock_new_inode(inode);
499
500	return inode;
501
502	out:
503	if (ino == MFT_REC_MFT && !sb->s_root)
504	sbi->mft.ni = NULL;
505
506	iget_failed(inode);
507	return ERR_PTR(error: err);
508	}
509
510	/*
511	* ntfs_test_inode
512	*
513	* Return: 1 if match.
514	*/
515	static int ntfs_test_inode(struct inode *inode, void *data)
516	{
517	struct MFT_REF *ref = data;
518
519	return ino_get(ref) == inode->i_ino;
520	}
521
522	static int ntfs_set_inode(struct inode *inode, void *data)
523	{
524	const struct MFT_REF *ref = data;
525
526	inode->i_ino = ino_get(ref);
527	return 0;
528	}
529
530	struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
531	const struct cpu_str *name)
532	{
533	struct inode *inode;
534
535	inode = iget5_locked(sb, ino_get(ref), test: ntfs_test_inode, set: ntfs_set_inode,
536	(void *)ref);
537	if (unlikely(!inode))
538	return ERR_PTR(error: -ENOMEM);
539
540	/* If this is a freshly allocated inode, need to read it now. */
541	if (inode_state_read_once(inode) & I_NEW)
542	inode = ntfs_read_mft(inode, name, ref);
543	else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
544	/*
545	* Sequence number is not expected.
546	* Looks like inode was reused but caller uses the old reference
547	*/
548	iput(inode);
549	inode = ERR_PTR(error: -ESTALE);
550	}
551
552	if (IS_ERR(ptr: inode))
553	ntfs_set_state(sbi: sb->s_fs_info, dirty: NTFS_DIRTY_ERROR);
554
555	return inode;
556	}
557
558	enum get_block_ctx {
559	GET_BLOCK_GENERAL = 0,
560	GET_BLOCK_WRITE_BEGIN = 1,
561	GET_BLOCK_DIRECT_IO_R = 2,
562	GET_BLOCK_DIRECT_IO_W = 3,
563	GET_BLOCK_BMAP = 4,
564	};
565
566	static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
567	struct buffer_head *bh, int create,
568	enum get_block_ctx ctx)
569	{
570	struct super_block *sb = inode->i_sb;
571	struct ntfs_sb_info *sbi = sb->s_fs_info;
572	struct ntfs_inode *ni = ntfs_i(inode);
573	struct folio *folio = bh->b_folio;
574	u8 cluster_bits = sbi->cluster_bits;
575	u32 block_size = sb->s_blocksize;
576	u64 bytes, lbo, valid;
577	u32 off;
578	int err;
579	CLST vcn, lcn, len;
580	bool new;
581
582	/* Clear previous state. */
583	clear_buffer_new(bh);
584	clear_buffer_uptodate(bh);
585
586	if (is_resident(ni)) {
587	bh->b_blocknr = RESIDENT_LCN;
588	bh->b_size = block_size;
589	if (!folio) {
590	/* direct io (read) or bmap call */
591	err = 0;
592	} else {
593	ni_lock(ni);
594	err = attr_data_read_resident(ni, folio);
595	ni_unlock(ni);
596
597	if (!err)
598	set_buffer_uptodate(bh);
599	}
600	return err;
601	}
602
603	vcn = vbo >> cluster_bits;
604	off = vbo & sbi->cluster_mask;
605	new = false;
606
607	err = attr_data_get_block(ni, vcn, clen: 1, lcn: &lcn, len: &len, new: create ? &new : NULL,
608	zero: create && sbi->cluster_size > PAGE_SIZE);
609	if (err)
610	goto out;
611
612	if (!len)
613	return 0;
614
615	bytes = ((u64)len << cluster_bits) - off;
616
617	if (lcn >= sbi->used.bitmap.nbits) {
618	/* This case includes resident/compressed/sparse. */
619	if (!create) {
620	if (bh->b_size > bytes)
621	bh->b_size = bytes;
622	return 0;
623	}
624	WARN_ON(1);
625	}
626
627	if (new)
628	set_buffer_new(bh);
629
630	lbo = ((u64)lcn << cluster_bits) + off;
631
632	set_buffer_mapped(bh);
633	bh->b_bdev = sb->s_bdev;
634	bh->b_blocknr = lbo >> sb->s_blocksize_bits;
635
636	valid = ni->i_valid;
637
638	if (ctx == GET_BLOCK_DIRECT_IO_W) {
639	/* ntfs_direct_IO will update ni->i_valid. */
640	if (vbo >= valid)
641	set_buffer_new(bh);
642	} else if (create) {
643	/* Normal write. */
644	if (bytes > bh->b_size)
645	bytes = bh->b_size;
646
647	if (vbo >= valid)
648	set_buffer_new(bh);
649
650	if (vbo + bytes > valid) {
651	ni->i_valid = vbo + bytes;
652	mark_inode_dirty(inode);
653	}
654	} else if (vbo >= valid) {
655	/* Read out of valid data. */
656	clear_buffer_mapped(bh);
657	} else if (vbo + bytes <= valid) {
658	/* Normal read. */
659	} else if (vbo + block_size <= valid) {
660	/* Normal short read. */
661	bytes = block_size;
662	} else {
663	/*
664	* Read across valid size: vbo < valid && valid < vbo + block_size
665	*/
666	bytes = block_size;
667
668	if (folio) {
669	u32 voff = valid - vbo;
670
671	bh->b_size = block_size;
672	off = vbo & (PAGE_SIZE - 1);
673	folio_set_bh(bh, folio, offset: off);
674
675	if (bh_read(bh, op_flags: 0) < 0) {
676	err = -EIO;
677	goto out;
678	}
679	folio_zero_segment(folio, start: off + voff, xend: off + block_size);
680	}
681	}
682
683	if (bh->b_size > bytes)
684	bh->b_size = bytes;
685
686	#ifndef __LP64__
687	if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
688	static_assert(sizeof(size_t) < sizeof(loff_t));
689	if (bytes > 0x40000000u)
690	bh->b_size = 0x40000000u;
691	}
692	#endif
693
694	return 0;
695
696	out:
697	return err;
698	}
699
700	int ntfs_get_block(struct inode *inode, sector_t vbn,
701	struct buffer_head *bh_result, int create)
702	{
703	return ntfs_get_block_vbo(inode, vbo: (u64)vbn << inode->i_blkbits,
704	bh: bh_result, create, ctx: GET_BLOCK_GENERAL);
705	}
706
707	static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
708	struct buffer_head *bh_result, int create)
709	{
710	return ntfs_get_block_vbo(inode,
711	vbo: (u64)vsn << inode->i_sb->s_blocksize_bits,
712	bh: bh_result, create, ctx: GET_BLOCK_BMAP);
713	}
714
715	static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
716	{
717	return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
718	}
719
720	static int ntfs_read_folio(struct file *file, struct folio *folio)
721	{
722	int err;
723	struct address_space *mapping = folio->mapping;
724	struct inode *inode = mapping->host;
725	struct ntfs_inode *ni = ntfs_i(inode);
726
727	if (is_resident(ni)) {
728	ni_lock(ni);
729	err = attr_data_read_resident(ni, folio);
730	ni_unlock(ni);
731	if (err != E_NTFS_NONRESIDENT) {
732	folio_unlock(folio);
733	return err;
734	}
735	}
736
737	if (is_compressed(ni)) {
738	ni_lock(ni);
739	err = ni_readpage_cmpr(ni, folio);
740	ni_unlock(ni);
741	return err;
742	}
743
744	/* Normal + sparse files. */
745	return mpage_read_folio(folio, get_block: ntfs_get_block);
746	}
747
748	static void ntfs_readahead(struct readahead_control *rac)
749	{
750	struct address_space *mapping = rac->mapping;
751	struct inode *inode = mapping->host;
752	struct ntfs_inode *ni = ntfs_i(inode);
753	u64 valid;
754	loff_t pos;
755
756	if (is_resident(ni)) {
757	/* No readahead for resident. */
758	return;
759	}
760
761	if (is_compressed(ni)) {
762	/* No readahead for compressed. */
763	return;
764	}
765
766	valid = ni->i_valid;
767	pos = readahead_pos(rac);
768
769	if (valid < i_size_read(inode) && pos <= valid &&
770	valid < pos + readahead_length(rac)) {
771	/* Range cross 'valid'. Read it page by page. */
772	return;
773	}
774
775	mpage_readahead(rac, get_block: ntfs_get_block);
776	}
777
778	static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
779	struct buffer_head *bh_result, int create)
780	{
781	return ntfs_get_block_vbo(inode, vbo: (u64)iblock << inode->i_blkbits,
782	bh: bh_result, create, ctx: GET_BLOCK_DIRECT_IO_R);
783	}
784
785	static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
786	struct buffer_head *bh_result, int create)
787	{
788	return ntfs_get_block_vbo(inode, vbo: (u64)iblock << inode->i_blkbits,
789	bh: bh_result, create, ctx: GET_BLOCK_DIRECT_IO_W);
790	}
791
792	static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
793	{
794	struct file *file = iocb->ki_filp;
795	struct address_space *mapping = file->f_mapping;
796	struct inode *inode = mapping->host;
797	struct ntfs_inode *ni = ntfs_i(inode);
798	loff_t vbo = iocb->ki_pos;
799	loff_t end;
800	int wr = iov_iter_rw(i: iter) & WRITE;
801	size_t iter_count = iov_iter_count(i: iter);
802	loff_t valid;
803	ssize_t ret;
804
805	if (is_resident(ni)) {
806	/* Switch to buffered write. */
807	ret = 0;
808	goto out;
809	}
810	if (is_compressed(ni)) {
811	ret = 0;
812	goto out;
813	}
814
815	ret = blockdev_direct_IO(iocb, inode, iter,
816	get_block: wr ? ntfs_get_block_direct_IO_W :
817	ntfs_get_block_direct_IO_R);
818
819	if (ret > 0)
820	end = vbo + ret;
821	else if (wr && ret == -EIOCBQUEUED)
822	end = vbo + iter_count;
823	else
824	goto out;
825
826	valid = ni->i_valid;
827	if (wr) {
828	if (end > valid && !S_ISBLK(inode->i_mode)) {
829	ni->i_valid = end;
830	mark_inode_dirty(inode);
831	}
832	} else if (vbo < valid && valid < end) {
833	/* Fix page. */
834	iov_iter_revert(i: iter, bytes: end - valid);
835	iov_iter_zero(bytes: end - valid, iter);
836	}
837
838	out:
839	return ret;
840	}
841
842	int ntfs_set_size(struct inode *inode, u64 new_size)
843	{
844	struct super_block *sb = inode->i_sb;
845	struct ntfs_sb_info *sbi = sb->s_fs_info;
846	struct ntfs_inode *ni = ntfs_i(inode);
847	int err;
848
849	/* Check for maximum file size. */
850	if (is_sparsed(ni) || is_compressed(ni)) {
851	if (new_size > sbi->maxbytes_sparse) {
852	err = -EFBIG;
853	goto out;
854	}
855	} else if (new_size > sbi->maxbytes) {
856	err = -EFBIG;
857	goto out;
858	}
859
860	ni_lock(ni);
861	down_write(sem: &ni->file.run_lock);
862
863	err = attr_set_size(ni, type: ATTR_DATA, NULL, name_len: 0, run: &ni->file.run, new_size,
864	new_valid: &ni->i_valid, keep_prealloc: true, NULL);
865
866	up_write(sem: &ni->file.run_lock);
867	ni_unlock(ni);
868
869	mark_inode_dirty(inode);
870
871	out:
872	return err;
873	}
874
875	static int ntfs_resident_writepage(struct folio *folio,
876	struct writeback_control *wbc)
877	{
878	struct address_space *mapping = folio->mapping;
879	struct inode *inode = mapping->host;
880	struct ntfs_inode *ni = ntfs_i(inode);
881	int ret;
882
883	/* Avoid any operation if inode is bad. */
884	if (unlikely(is_bad_ni(ni)))
885	return -EINVAL;
886
887	if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
888	return -EIO;
889
890	ni_lock(ni);
891	ret = attr_data_write_resident(ni, folio);
892	ni_unlock(ni);
893
894	if (ret != E_NTFS_NONRESIDENT)
895	folio_unlock(folio);
896	mapping_set_error(mapping, error: ret);
897	return ret;
898	}
899
900	static int ntfs_writepages(struct address_space *mapping,
901	struct writeback_control *wbc)
902	{
903	struct inode *inode = mapping->host;
904
905	/* Avoid any operation if inode is bad. */
906	if (unlikely(is_bad_ni(ntfs_i(inode))))
907	return -EINVAL;
908
909	if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
910	return -EIO;
911
912	if (is_resident(ni: ntfs_i(inode))) {
913	struct folio *folio = NULL;
914	int error;
915
916	while ((folio = writeback_iter(mapping, wbc, folio, error: &error)))
917	error = ntfs_resident_writepage(folio, wbc);
918	return error;
919	}
920	return mpage_writepages(mapping, wbc, get_block: ntfs_get_block);
921	}
922
923	static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
924	struct buffer_head *bh_result, int create)
925	{
926	return ntfs_get_block_vbo(inode, vbo: (u64)vbn << inode->i_blkbits,
927	bh: bh_result, create, ctx: GET_BLOCK_WRITE_BEGIN);
928	}
929
930	int ntfs_write_begin(const struct kiocb *iocb, struct address_space *mapping,
931	loff_t pos, u32 len, struct folio **foliop, void **fsdata)
932	{
933	int err;
934	struct inode *inode = mapping->host;
935	struct ntfs_inode *ni = ntfs_i(inode);
936
937	/* Avoid any operation if inode is bad. */
938	if (unlikely(is_bad_ni(ni)))
939	return -EINVAL;
940
941	if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
942	return -EIO;
943
944	if (is_resident(ni)) {
945	struct folio *folio = __filemap_get_folio(
946	mapping, index: pos >> PAGE_SHIFT, FGP_WRITEBEGIN,
947	gfp: mapping_gfp_mask(mapping));
948
949	if (IS_ERR(ptr: folio)) {
950	err = PTR_ERR(ptr: folio);
951	goto out;
952	}
953
954	ni_lock(ni);
955	err = attr_data_read_resident(ni, folio);
956	ni_unlock(ni);
957
958	if (!err) {
959	*foliop = folio;
960	goto out;
961	}
962	folio_unlock(folio);
963	folio_put(folio);
964
965	if (err != E_NTFS_NONRESIDENT)
966	goto out;
967	}
968
969	err = block_write_begin(mapping, pos, len, foliop,
970	get_block: ntfs_get_block_write_begin);
971
972	out:
973	return err;
974	}
975
976	/*
977	* ntfs_write_end - Address_space_operations::write_end.
978	*/
979	int ntfs_write_end(const struct kiocb *iocb, struct address_space *mapping,
980	loff_t pos, u32 len, u32 copied, struct folio *folio,
981	void *fsdata)
982	{
983	struct inode *inode = mapping->host;
984	struct ntfs_inode *ni = ntfs_i(inode);
985	u64 valid = ni->i_valid;
986	bool dirty = false;
987	int err;
988
989	if (is_resident(ni)) {
990	ni_lock(ni);
991	err = attr_data_write_resident(ni, folio);
992	ni_unlock(ni);
993	if (!err) {
994	struct buffer_head *head = folio_buffers(folio);
995	dirty = true;
996	/* Clear any buffers in folio. */
997	if (head) {
998	struct buffer_head *bh = head;
999
1000	do {
1001	clear_buffer_dirty(bh);
1002	clear_buffer_mapped(bh);
1003	set_buffer_uptodate(bh);
1004	} while (head != (bh = bh->b_this_page));
1005	}
1006	folio_mark_uptodate(folio);
1007	err = copied;
1008	}
1009	folio_unlock(folio);
1010	folio_put(folio);
1011	} else {
1012	err = generic_write_end(iocb, mapping, pos, len, copied, folio,
1013	fsdata);
1014	}
1015
1016	if (err >= 0) {
1017	if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
1018	inode_set_mtime_to_ts(inode,
1019	ts: inode_set_ctime_current(inode));
1020	ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
1021	dirty = true;
1022	}
1023
1024	if (valid != ni->i_valid) {
1025	/* ni->i_valid is changed in ntfs_get_block_vbo. */
1026	dirty = true;
1027	}
1028
1029	if (pos + err > inode->i_size) {
1030	i_size_write(inode, i_size: pos + err);
1031	dirty = true;
1032	}
1033
1034	if (dirty)
1035	mark_inode_dirty(inode);
1036	}
1037
1038	return err;
1039	}
1040
1041	int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1042	{
1043	return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1044	}
1045
1046	int ntfs_sync_inode(struct inode *inode)
1047	{
1048	return _ni_write_inode(inode, 1);
1049	}
1050
1051	/*
1052	* Helper function to read file.
1053	*/
1054	int inode_read_data(struct inode *inode, void *data, size_t bytes)
1055	{
1056	pgoff_t idx;
1057	struct address_space *mapping = inode->i_mapping;
1058
1059	for (idx = 0; bytes; idx++) {
1060	size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1061	struct page *page = read_mapping_page(mapping, index: idx, NULL);
1062	void *kaddr;
1063
1064	if (IS_ERR(ptr: page))
1065	return PTR_ERR(ptr: page);
1066
1067	kaddr = kmap_atomic(page);
1068	memcpy(data, kaddr, op);
1069	kunmap_atomic(kaddr);
1070
1071	put_page(page);
1072
1073	bytes -= op;
1074	data = Add2Ptr(data, PAGE_SIZE);
1075	}
1076	return 0;
1077	}
1078
1079	/*
1080	* ntfs_reparse_bytes
1081	*
1082	* Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1083	* for unicode string of @uni_len length.
1084	*/
1085	static inline u32 ntfs_reparse_bytes(u32 uni_len, bool is_absolute)
1086	{
1087	/* Header + unicode string + decorated unicode string. */
1088	return sizeof(short) * (2 * uni_len + (is_absolute ? 4 : 0)) +
1089	offsetof(struct REPARSE_DATA_BUFFER,
1090	SymbolicLinkReparseBuffer.PathBuffer);
1091	}
1092
1093	static struct REPARSE_DATA_BUFFER *
1094	ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1095	u32 size, u16 *nsize)
1096	{
1097	int i, err;
1098	struct REPARSE_DATA_BUFFER *rp;
1099	__le16 *rp_name;
1100	typeof(rp->SymbolicLinkReparseBuffer) *rs;
1101	bool is_absolute;
1102
1103	is_absolute = symname[0] && symname[1] == ':';
1104
1105	rp = kzalloc(ntfs_reparse_bytes(2 * size + 2, is_absolute), GFP_NOFS);
1106	if (!rp)
1107	return ERR_PTR(error: -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, name: symname, name_len: size,
1114	uni: (struct cpu_str *)(rp_name - 1), max_ulen: 2 * size,
1115	endian: 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(uni_len: err, is_absolute);
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 =
1141	cpu_to_le16(sizeof(short) * err + (is_absolute ? 8 : 0));
1142	rs->PrintNameLength = rs->SubstituteNameOffset;
1143
1144	/*
1145	* TODO: Use relative path if possible to allow Windows to
1146	* parse this path.
1147	* 0-absolute path, 1- relative path (SYMLINK_FLAG_RELATIVE).
1148	*/
1149	rs->Flags = cpu_to_le32(is_absolute ? 0 : SYMLINK_FLAG_RELATIVE);
1150
1151	memmove(rp_name + err + (is_absolute ? 4 : 0), rp_name,
1152	sizeof(short) * err);
1153
1154	if (is_absolute) {
1155	/* Decorate SubstituteName. */
1156	rp_name += err;
1157	rp_name[0] = cpu_to_le16('\\');
1158	rp_name[1] = cpu_to_le16('?');
1159	rp_name[2] = cpu_to_le16('?');
1160	rp_name[3] = cpu_to_le16('\\');
1161	}
1162
1163	return rp;
1164	out:
1165	kfree(objp: rp);
1166	return ERR_PTR(error: err);
1167	}
1168
1169	/*
1170	* ntfs_create_inode
1171	*
1172	* Helper function for:
1173	* - ntfs_create
1174	* - ntfs_mknod
1175	* - ntfs_symlink
1176	* - ntfs_mkdir
1177	* - ntfs_atomic_open
1178	*
1179	* NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1180	*/
1181	int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1182	struct dentry *dentry, const struct cpu_str *uni,
1183	umode_t mode, dev_t dev, const char *symname, u32 size,
1184	struct ntfs_fnd *fnd)
1185	{
1186	int err;
1187	struct super_block *sb = dir->i_sb;
1188	struct ntfs_sb_info *sbi = sb->s_fs_info;
1189	const struct qstr *name = &dentry->d_name;
1190	CLST ino = 0;
1191	struct ntfs_inode *dir_ni = ntfs_i(inode: dir);
1192	struct ntfs_inode *ni = NULL;
1193	struct inode *inode = NULL;
1194	struct ATTRIB *attr;
1195	struct ATTR_STD_INFO5 *std5;
1196	struct ATTR_FILE_NAME *fname;
1197	struct MFT_REC *rec;
1198	u32 asize, dsize, sd_size;
1199	enum FILE_ATTRIBUTE fa;
1200	__le32 security_id = SECURITY_ID_INVALID;
1201	CLST vcn;
1202	const void *sd;
1203	u16 t16, nsize = 0, aid = 0;
1204	struct INDEX_ROOT *root, *dir_root;
1205	struct NTFS_DE *e, *new_de = NULL;
1206	struct REPARSE_DATA_BUFFER *rp = NULL;
1207	bool rp_inserted = false;
1208
1209	/* New file will be resident or non resident. */
1210	const bool new_file_resident = 1;
1211
1212	if (!fnd)
1213	ni_lock_dir(ni: dir_ni);
1214
1215	dir_root = indx_get_root(indx: &dir_ni->dir, ni: dir_ni, NULL, NULL);
1216	if (!dir_root) {
1217	err = -EINVAL;
1218	goto out1;
1219	}
1220
1221	if (S_ISDIR(mode)) {
1222	/* Use parent's directory attributes. */
1223	fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1224	FILE_ATTRIBUTE_ARCHIVE;
1225	/*
1226	* By default child directory inherits parent attributes.
1227	* Root directory is hidden + system.
1228	* Make an exception for children in root.
1229	*/
1230	if (dir->i_ino == MFT_REC_ROOT)
1231	fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1232	} else if (S_ISLNK(mode)) {
1233	/* It is good idea that link should be the same type (file/dir) as target */
1234	fa = FILE_ATTRIBUTE_REPARSE_POINT;
1235
1236	/*
1237	* Linux: there are dir/file/symlink and so on.
1238	* NTFS: symlinks are "dir + reparse" or "file + reparse"
1239	* It is good idea to create:
1240	* dir + reparse if 'symname' points to directory
1241	* or
1242	* file + reparse if 'symname' points to file
1243	* Unfortunately kern_path hangs if symname contains 'dir'.
1244	*/
1245
1246	/*
1247	* struct path path;
1248	*
1249	* if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1250	* struct inode *target = d_inode(path.dentry);
1251	*
1252	* if (S_ISDIR(target->i_mode))
1253	* fa |= FILE_ATTRIBUTE_DIRECTORY;
1254	* // if ( target->i_sb == sb ){
1255	* // use relative path?
1256	* // }
1257	* path_put(&path);
1258	* }
1259	*/
1260	} else if (S_ISREG(mode)) {
1261	if (sbi->options->sparse) {
1262	/* Sparsed regular file, cause option 'sparse'. */
1263	fa = FILE_ATTRIBUTE_SPARSE_FILE |
1264	FILE_ATTRIBUTE_ARCHIVE;
1265	} else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1266	/* Compressed regular file, if parent is compressed. */
1267	fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1268	} else {
1269	/* Regular file, default attributes. */
1270	fa = FILE_ATTRIBUTE_ARCHIVE;
1271	}
1272	} else {
1273	fa = FILE_ATTRIBUTE_ARCHIVE;
1274	}
1275
1276	/* If option "hide_dot_files" then set hidden attribute for dot files. */
1277	if (sbi->options->hide_dot_files && name->name[0] == '.')
1278	fa |= FILE_ATTRIBUTE_HIDDEN;
1279
1280	if (!(mode & 0222))
1281	fa |= FILE_ATTRIBUTE_READONLY;
1282
1283	/* Allocate PATH_MAX bytes. */
1284	new_de = kmem_cache_zalloc(names_cachep, GFP_KERNEL);
1285	if (!new_de) {
1286	err = -ENOMEM;
1287	goto out1;
1288	}
1289
1290	/* Avoid any operation if inode is bad. */
1291	if (unlikely(is_bad_ni(dir_ni))) {
1292	err = -EINVAL;
1293	goto out2;
1294	}
1295
1296	if (unlikely(ntfs3_forced_shutdown(sb))) {
1297	err = -EIO;
1298	goto out2;
1299	}
1300
1301	/* Mark rw ntfs as dirty. it will be cleared at umount. */
1302	ntfs_set_state(sbi, dirty: NTFS_DIRTY_DIRTY);
1303
1304	/* Step 1: allocate and fill new mft record. */
1305	err = ntfs_look_free_mft(sbi, rno: &ino, mft: false, NULL, NULL);
1306	if (err)
1307	goto out2;
1308
1309	ni = ntfs_new_inode(sbi, nRec: ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1310	if (IS_ERR(ptr: ni)) {
1311	err = PTR_ERR(ptr: ni);
1312	ni = NULL;
1313	goto out3;
1314	}
1315	inode = &ni->vfs_inode;
1316	inode_init_owner(idmap, inode, dir, mode);
1317	mode = inode->i_mode;
1318
1319	ni->i_crtime = current_time(inode);
1320
1321	rec = ni->mi.mrec;
1322	rec->hard_links = cpu_to_le16(1);
1323	attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1324
1325	/* Get default security id. */
1326	sd = s_default_security;
1327	sd_size = sizeof(s_default_security);
1328
1329	if (is_ntfs3(sbi)) {
1330	security_id = dir_ni->std_security_id;
1331	if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1332	security_id = sbi->security.def_security_id;
1333
1334	if (security_id == SECURITY_ID_INVALID &&
1335	!ntfs_insert_security(sbi, sd, size: sd_size,
1336	security_id: &security_id, NULL))
1337	sbi->security.def_security_id = security_id;
1338	}
1339	}
1340
1341	/* Insert standard info. */
1342	std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1343
1344	if (security_id == SECURITY_ID_INVALID) {
1345	dsize = sizeof(struct ATTR_STD_INFO);
1346	} else {
1347	dsize = sizeof(struct ATTR_STD_INFO5);
1348	std5->security_id = security_id;
1349	ni->std_security_id = security_id;
1350	}
1351	asize = SIZEOF_RESIDENT + dsize;
1352
1353	attr->type = ATTR_STD;
1354	attr->size = cpu_to_le32(asize);
1355	attr->id = cpu_to_le16(aid++);
1356	attr->res.data_off = SIZEOF_RESIDENT_LE;
1357	attr->res.data_size = cpu_to_le32(dsize);
1358
1359	std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1360	kernel2nt(ts: &ni->i_crtime);
1361
1362	std5->fa = ni->std_fa = fa;
1363
1364	attr = Add2Ptr(attr, asize);
1365
1366	/* Insert file name. */
1367	err = fill_name_de(sbi, buf: new_de, name, uni);
1368	if (err)
1369	goto out4;
1370
1371	mi_get_ref(mi: &ni->mi, ref: &new_de->ref);
1372
1373	fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1374
1375	if (sbi->options->windows_names &&
1376	!valid_windows_name(sbi, name: (struct le_str *)&fname->name_len)) {
1377	err = -EINVAL;
1378	goto out4;
1379	}
1380
1381	mi_get_ref(mi: &dir_ni->mi, ref: &fname->home);
1382	fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1383	fname->dup.a_time = std5->cr_time;
1384	fname->dup.alloc_size = fname->dup.data_size = 0;
1385	fname->dup.fa = std5->fa;
1386	fname->dup.extend_data = S_ISLNK(mode) ? IO_REPARSE_TAG_SYMLINK : 0;
1387
1388	dsize = le16_to_cpu(new_de->key_size);
1389	asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1390
1391	attr->type = ATTR_NAME;
1392	attr->size = cpu_to_le32(asize);
1393	attr->res.data_off = SIZEOF_RESIDENT_LE;
1394	attr->res.flags = RESIDENT_FLAG_INDEXED;
1395	attr->id = cpu_to_le16(aid++);
1396	attr->res.data_size = cpu_to_le32(dsize);
1397	memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1398
1399	attr = Add2Ptr(attr, asize);
1400
1401	if (security_id == SECURITY_ID_INVALID) {
1402	/* Insert security attribute. */
1403	asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1404
1405	attr->type = ATTR_SECURE;
1406	attr->size = cpu_to_le32(asize);
1407	attr->id = cpu_to_le16(aid++);
1408	attr->res.data_off = SIZEOF_RESIDENT_LE;
1409	attr->res.data_size = cpu_to_le32(sd_size);
1410	memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1411
1412	attr = Add2Ptr(attr, asize);
1413	}
1414
1415	attr->id = cpu_to_le16(aid++);
1416	if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1417	/*
1418	* Regular directory or symlink to directory.
1419	* Create root attribute.
1420	*/
1421	dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1422	asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1423
1424	attr->type = ATTR_ROOT;
1425	attr->size = cpu_to_le32(asize);
1426
1427	attr->name_len = ARRAY_SIZE(I30_NAME);
1428	attr->name_off = SIZEOF_RESIDENT_LE;
1429	attr->res.data_off =
1430	cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1431	attr->res.data_size = cpu_to_le32(dsize);
1432	memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1433	sizeof(I30_NAME));
1434
1435	root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1436	memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1437	root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1438	root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1439	sizeof(struct NTFS_DE));
1440	root->ihdr.total = root->ihdr.used;
1441
1442	e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1443	e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1444	e->flags = NTFS_IE_LAST;
1445	} else if (S_ISLNK(mode)) {
1446	/*
1447	* Symlink to file.
1448	* Create empty resident data attribute.
1449	*/
1450	asize = SIZEOF_RESIDENT;
1451
1452	/* Insert empty ATTR_DATA */
1453	attr->type = ATTR_DATA;
1454	attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1455	attr->name_off = SIZEOF_RESIDENT_LE;
1456	attr->res.data_off = SIZEOF_RESIDENT_LE;
1457	} else if (!new_file_resident && S_ISREG(mode)) {
1458	/*
1459	* Regular file. Create empty non resident data attribute.
1460	*/
1461	attr->type = ATTR_DATA;
1462	attr->non_res = 1;
1463	attr->nres.evcn = cpu_to_le64(-1ll);
1464	if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1465	attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1466	attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1467	attr->flags = ATTR_FLAG_SPARSED;
1468	asize = SIZEOF_NONRESIDENT_EX + 8;
1469	} else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1470	attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1471	attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1472	attr->flags = ATTR_FLAG_COMPRESSED;
1473	attr->nres.c_unit = NTFS_LZNT_CUNIT;
1474	asize = SIZEOF_NONRESIDENT_EX + 8;
1475	} else {
1476	attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1477	attr->name_off = SIZEOF_NONRESIDENT_LE;
1478	asize = SIZEOF_NONRESIDENT + 8;
1479	}
1480	attr->nres.run_off = attr->name_off;
1481	} else {
1482	/*
1483	* Node. Create empty resident data attribute.
1484	*/
1485	attr->type = ATTR_DATA;
1486	attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1487	attr->name_off = SIZEOF_RESIDENT_LE;
1488	if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1489	attr->flags = ATTR_FLAG_SPARSED;
1490	else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1491	attr->flags = ATTR_FLAG_COMPRESSED;
1492	attr->res.data_off = SIZEOF_RESIDENT_LE;
1493	asize = SIZEOF_RESIDENT;
1494	ni->ni_flags |= NI_FLAG_RESIDENT;
1495	}
1496
1497	if (S_ISDIR(mode)) {
1498	ni->ni_flags |= NI_FLAG_DIR;
1499	err = indx_init(indx: &ni->dir, sbi, attr, type: INDEX_MUTEX_I30);
1500	if (err)
1501	goto out4;
1502	} else if (S_ISLNK(mode)) {
1503	rp = ntfs_create_reparse_buffer(sbi, symname, size, nsize: &nsize);
1504
1505	if (IS_ERR(ptr: rp)) {
1506	err = PTR_ERR(ptr: rp);
1507	rp = NULL;
1508	goto out4;
1509	}
1510
1511	/*
1512	* Insert ATTR_REPARSE.
1513	*/
1514	attr = Add2Ptr(attr, asize);
1515	attr->type = ATTR_REPARSE;
1516	attr->id = cpu_to_le16(aid++);
1517
1518	/* Resident or non resident? */
1519	asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1520	t16 = PtrOffset(rec, attr);
1521
1522	/*
1523	* Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1524	* It is good idea to keep extended attributes resident.
1525	*/
1526	if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1527	CLST alen;
1528	CLST clst = bytes_to_cluster(sbi, size: nsize);
1529
1530	/* Bytes per runs. */
1531	t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1532
1533	attr->non_res = 1;
1534	attr->nres.evcn = cpu_to_le64(clst - 1);
1535	attr->name_off = SIZEOF_NONRESIDENT_LE;
1536	attr->nres.run_off = attr->name_off;
1537	attr->nres.data_size = cpu_to_le64(nsize);
1538	attr->nres.valid_size = attr->nres.data_size;
1539	attr->nres.alloc_size =
1540	cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1541
1542	err = attr_allocate_clusters(sbi, run: &ni->file.run, vcn: 0, lcn: 0,
1543	len: clst, NULL, opt: ALLOCATE_DEF,
1544	alen: &alen, fr: 0, NULL, NULL);
1545	if (err)
1546	goto out5;
1547
1548	err = run_pack(run: &ni->file.run, svcn: 0, len: clst,
1549	Add2Ptr(attr, SIZEOF_NONRESIDENT), run_buf_size: t16,
1550	packed_vcns: &vcn);
1551	if (err < 0)
1552	goto out5;
1553
1554	if (vcn != clst) {
1555	err = -EINVAL;
1556	goto out5;
1557	}
1558
1559	asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1560	/* Write non resident data. */
1561	err = ntfs_sb_write_run(sbi, run: &ni->file.run, vbo: 0, buf: rp,
1562	bytes: nsize, sync: 0);
1563	if (err)
1564	goto out5;
1565	} else {
1566	attr->res.data_off = SIZEOF_RESIDENT_LE;
1567	attr->res.data_size = cpu_to_le32(nsize);
1568	memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1569	}
1570	/* Size of symlink equals the length of input string. */
1571	inode->i_size = size;
1572
1573	attr->size = cpu_to_le32(asize);
1574
1575	err = ntfs_insert_reparse(sbi, rtag: IO_REPARSE_TAG_SYMLINK,
1576	ref: &new_de->ref);
1577	if (err)
1578	goto out5;
1579
1580	rp_inserted = true;
1581	}
1582
1583	attr = Add2Ptr(attr, asize);
1584	attr->type = ATTR_END;
1585
1586	rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1587	rec->next_attr_id = cpu_to_le16(aid);
1588
1589	inode->i_generation = le16_to_cpu(rec->seq);
1590
1591	if (S_ISDIR(mode)) {
1592	inode->i_op = &ntfs_dir_inode_operations;
1593	inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1594	&ntfs_legacy_dir_operations :
1595	&ntfs_dir_operations;
1596	} else if (S_ISLNK(mode)) {
1597	inode->i_op = &ntfs_link_inode_operations;
1598	inode->i_fop = NULL;
1599	inode->i_mapping->a_ops = &ntfs_aops;
1600	inode->i_size = size;
1601	inode_nohighmem(inode);
1602	} else if (S_ISREG(mode)) {
1603	inode->i_op = &ntfs_file_inode_operations;
1604	inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1605	&ntfs_legacy_file_operations :
1606	&ntfs_file_operations;
1607	inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1608	&ntfs_aops;
1609	init_rwsem(&ni->file.run_lock);
1610	} else {
1611	inode->i_op = &ntfs_special_inode_operations;
1612	init_special_inode(inode, mode, dev);
1613	}
1614
1615	#ifdef CONFIG_NTFS3_FS_POSIX_ACL
1616	if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1617	err = ntfs_init_acl(idmap, inode, dir);
1618	if (err)
1619	goto out5;
1620	} else
1621	#endif
1622	{
1623	inode->i_flags |= S_NOSEC;
1624	}
1625
1626	if (!S_ISLNK(mode)) {
1627	/*
1628	* ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1629	* The packed size of extended attribute is stored in direntry too.
1630	* 'fname' here points to inside new_de.
1631	*/
1632	err = ntfs_save_wsl_perm(inode, ea_size: &fname->dup.extend_data);
1633	if (err)
1634	goto out6;
1635
1636	/*
1637	* update ea_size in file_name attribute too.
1638	* Use ni_find_attr cause layout of MFT record may be changed
1639	* in ntfs_init_acl and ntfs_save_wsl_perm.
1640	*/
1641	attr = ni_find_attr(ni, NULL, NULL, type: ATTR_NAME, NULL, name_len: 0, NULL,
1642	NULL);
1643	if (attr) {
1644	struct ATTR_FILE_NAME *fn;
1645
1646	fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1647	if (fn)
1648	fn->dup.extend_data = fname->dup.extend_data;
1649	}
1650	}
1651
1652	/* We do not need to update parent directory later */
1653	ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1654
1655	/* Step 2: Add new name in index. */
1656	err = indx_insert_entry(indx: &dir_ni->dir, ni: dir_ni, new_de, param: sbi, fnd, undo: 0);
1657	if (err)
1658	goto out6;
1659
1660	/*
1661	* Call 'd_instantiate' after inode->i_op is set
1662	* but before finish_open.
1663	*/
1664	d_instantiate(dentry, inode);
1665
1666	/* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1667	inode_set_atime_to_ts(inode, ts: ni->i_crtime);
1668	inode_set_ctime_to_ts(inode, ts: ni->i_crtime);
1669	inode_set_mtime_to_ts(inode, ts: ni->i_crtime);
1670	inode_set_mtime_to_ts(inode: dir, ts: ni->i_crtime);
1671	inode_set_ctime_to_ts(inode: dir, ts: ni->i_crtime);
1672
1673	mark_inode_dirty(inode: dir);
1674	mark_inode_dirty(inode);
1675
1676	/* Normal exit. */
1677	goto out2;
1678
1679	out6:
1680	attr = ni_find_attr(ni, NULL, NULL, type: ATTR_EA, NULL, name_len: 0, NULL, NULL);
1681	if (attr && attr->non_res) {
1682	/* Delete ATTR_EA, if non-resident. */
1683	struct runs_tree run;
1684	run_init(run: &run);
1685	attr_set_size(ni, type: ATTR_EA, NULL, name_len: 0, run: &run, new_size: 0, NULL, keep_prealloc: false, NULL);
1686	run_close(run: &run);
1687	}
1688
1689	if (rp_inserted)
1690	ntfs_remove_reparse(sbi, rtag: IO_REPARSE_TAG_SYMLINK, ref: &new_de->ref);
1691
1692	out5:
1693	if (!S_ISDIR(mode))
1694	run_deallocate(sbi, run: &ni->file.run, trim: false);
1695
1696	out4:
1697	clear_rec_inuse(rec);
1698	clear_nlink(inode);
1699	ni->mi.dirty = false;
1700	discard_new_inode(inode);
1701	out3:
1702	ntfs_mark_rec_free(sbi, rno: ino, is_mft: false);
1703
1704	out2:
1705	__putname(new_de);
1706	kfree(objp: rp);
1707
1708	out1:
1709	if (!fnd)
1710	ni_unlock(ni: dir_ni);
1711
1712	if (!err)
1713	unlock_new_inode(inode);
1714
1715	return err;
1716	}
1717
1718	int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1719	{
1720	int err;
1721	struct ntfs_inode *ni = ntfs_i(inode);
1722	struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1723	struct NTFS_DE *de;
1724
1725	/* Allocate PATH_MAX bytes. */
1726	de = kmem_cache_zalloc(names_cachep, GFP_KERNEL);
1727	if (!de)
1728	return -ENOMEM;
1729
1730	/* Mark rw ntfs as dirty. It will be cleared at umount. */
1731	ntfs_set_state(sbi, dirty: NTFS_DIRTY_DIRTY);
1732
1733	/* Construct 'de'. */
1734	err = fill_name_de(sbi, buf: de, name: &dentry->d_name, NULL);
1735	if (err)
1736	goto out;
1737
1738	err = ni_add_name(dir_ni: ntfs_i(inode: d_inode(dentry: dentry->d_parent)), ni, de);
1739	out:
1740	__putname(de);
1741	return err;
1742	}
1743
1744	/*
1745	* ntfs_unlink_inode
1746	*
1747	* inode_operations::unlink
1748	* inode_operations::rmdir
1749	*/
1750	int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1751	{
1752	int err;
1753	struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1754	struct inode *inode = d_inode(dentry);
1755	struct ntfs_inode *ni = ntfs_i(inode);
1756	struct ntfs_inode *dir_ni = ntfs_i(inode: dir);
1757	struct NTFS_DE *de, *de2 = NULL;
1758	int undo_remove;
1759
1760	if (ntfs_is_meta_file(sbi, rno: ni->mi.rno))
1761	return -EINVAL;
1762
1763	/* Allocate PATH_MAX bytes. */
1764	de = kmem_cache_zalloc(names_cachep, GFP_KERNEL);
1765	if (!de)
1766	return -ENOMEM;
1767
1768	ni_lock(ni);
1769
1770	if (S_ISDIR(inode->i_mode) && !dir_is_empty(dir: inode)) {
1771	err = -ENOTEMPTY;
1772	goto out;
1773	}
1774
1775	err = fill_name_de(sbi, buf: de, name: &dentry->d_name, NULL);
1776	if (err < 0)
1777	goto out;
1778
1779	undo_remove = 0;
1780	err = ni_remove_name(dir_ni, ni, de, de2: &de2, undo_step: &undo_remove);
1781
1782	if (!err) {
1783	drop_nlink(inode);
1784	inode_set_mtime_to_ts(inode: dir, ts: inode_set_ctime_current(inode: dir));
1785	mark_inode_dirty(inode: dir);
1786	inode_set_ctime_to_ts(inode, ts: inode_get_ctime(inode: dir));
1787	if (inode->i_nlink)
1788	mark_inode_dirty(inode);
1789	} else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_step: undo_remove)) {
1790	_ntfs_bad_inode(inode);
1791	} else {
1792	if (ni_is_dirty(inode: dir))
1793	mark_inode_dirty(inode: dir);
1794	if (ni_is_dirty(inode))
1795	mark_inode_dirty(inode);
1796	}
1797
1798	out:
1799	ni_unlock(ni);
1800	__putname(de);
1801	return err;
1802	}
1803
1804	void ntfs_evict_inode(struct inode *inode)
1805	{
1806	truncate_inode_pages_final(mapping: &inode->i_data);
1807
1808	invalidate_inode_buffers(inode);
1809	clear_inode(inode);
1810
1811	ni_clear(ni: ntfs_i(inode));
1812	}
1813
1814	/*
1815	* ntfs_translate_junction
1816	*
1817	* Translate a Windows junction target to the Linux equivalent.
1818	* On junctions, targets are always absolute (they include the drive
1819	* letter). We have no way of knowing if the target is for the current
1820	* mounted device or not so we just assume it is.
1821	*/
1822	static int ntfs_translate_junction(const struct super_block *sb,
1823	const struct dentry *link_de, char *target,
1824	int target_len, int target_max)
1825	{
1826	int tl_len, err = target_len;
1827	char *link_path_buffer = NULL, *link_path;
1828	char *translated = NULL;
1829	char *target_start;
1830	int copy_len;
1831
1832	link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1833	if (!link_path_buffer) {
1834	err = -ENOMEM;
1835	goto out;
1836	}
1837	/* Get link path, relative to mount point */
1838	link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1839	if (IS_ERR(ptr: link_path)) {
1840	ntfs_err(sb, "Error getting link path");
1841	err = -EINVAL;
1842	goto out;
1843	}
1844
1845	translated = kmalloc(PATH_MAX, GFP_NOFS);
1846	if (!translated) {
1847	err = -ENOMEM;
1848	goto out;
1849	}
1850
1851	/* Make translated path a relative path to mount point */
1852	strcpy(p: translated, q: "./");
1853	++link_path; /* Skip leading / */
1854	for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1855	if (*link_path == '/') {
1856	if (PATH_MAX - tl_len < sizeof("../")) {
1857	ntfs_err(sb,
1858	"Link path %s has too many components",
1859	link_path);
1860	err = -EINVAL;
1861	goto out;
1862	}
1863	strcpy(p: translated + tl_len, q: "../");
1864	tl_len += sizeof("../") - 1;
1865	}
1866	}
1867
1868	/* Skip drive letter */
1869	target_start = target;
1870	while (*target_start && *target_start != ':')
1871	++target_start;
1872
1873	if (!*target_start) {
1874	ntfs_err(sb, "Link target (%s) missing drive separator",
1875	target);
1876	err = -EINVAL;
1877	goto out;
1878	}
1879
1880	/* Skip drive separator and leading /, if exists */
1881	target_start += 1 + (target_start[1] == '/');
1882	copy_len = target_len - (target_start - target);
1883
1884	if (PATH_MAX - tl_len <= copy_len) {
1885	ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1886	target_start, PATH_MAX - tl_len, copy_len);
1887	err = -EINVAL;
1888	goto out;
1889	}
1890
1891	/* translated path has a trailing / and target_start does not */
1892	strcpy(p: translated + tl_len, q: target_start);
1893	tl_len += copy_len;
1894	if (target_max <= tl_len) {
1895	ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1896	translated, target_max, tl_len);
1897	err = -EINVAL;
1898	goto out;
1899	}
1900	strcpy(p: target, q: translated);
1901	err = tl_len;
1902
1903	out:
1904	kfree(objp: link_path_buffer);
1905	kfree(objp: translated);
1906	return err;
1907	}
1908
1909	static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1910	struct inode *inode, char *buffer,
1911	int buflen)
1912	{
1913	int i, err = -EINVAL;
1914	struct ntfs_inode *ni = ntfs_i(inode);
1915	struct super_block *sb = inode->i_sb;
1916	struct ntfs_sb_info *sbi = sb->s_fs_info;
1917	u64 size;
1918	u16 ulen = 0;
1919	void *to_free = NULL;
1920	struct REPARSE_DATA_BUFFER *rp;
1921	const __le16 *uname;
1922	struct ATTRIB *attr;
1923
1924	/* Reparse data present. Try to parse it. */
1925	static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1926	static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1927
1928	*buffer = 0;
1929
1930	attr = ni_find_attr(ni, NULL, NULL, type: ATTR_REPARSE, NULL, name_len: 0, NULL, NULL);
1931	if (!attr)
1932	goto out;
1933
1934	if (!attr->non_res) {
1935	rp = resident_data_ex(attr, datasize: sizeof(struct REPARSE_DATA_BUFFER));
1936	if (!rp)
1937	goto out;
1938	size = le32_to_cpu(attr->res.data_size);
1939	} else {
1940	size = le64_to_cpu(attr->nres.data_size);
1941	rp = NULL;
1942	}
1943
1944	if (size > sbi->reparse.max_size || size <= sizeof(u32))
1945	goto out;
1946
1947	if (!rp) {
1948	rp = kmalloc(size, GFP_NOFS);
1949	if (!rp) {
1950	err = -ENOMEM;
1951	goto out;
1952	}
1953	to_free = rp;
1954	/* Read into temporal buffer. */
1955	err = ntfs_read_run_nb(sbi, run: &ni->file.run, vbo: 0, buf: rp, bytes: size, NULL);
1956	if (err)
1957	goto out;
1958	}
1959
1960	/* Microsoft Tag. */
1961	switch (rp->ReparseTag) {
1962	case IO_REPARSE_TAG_MOUNT_POINT:
1963	/* Mount points and junctions. */
1964	/* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1965	if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1966	MountPointReparseBuffer.PathBuffer))
1967	goto out;
1968	uname = Add2Ptr(rp,
1969	offsetof(struct REPARSE_DATA_BUFFER,
1970	MountPointReparseBuffer.PathBuffer) +
1971	le16_to_cpu(rp->MountPointReparseBuffer
1972	.PrintNameOffset));
1973	ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1974	break;
1975
1976	case IO_REPARSE_TAG_SYMLINK:
1977	/* FolderSymbolicLink */
1978	/* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1979	if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1980	SymbolicLinkReparseBuffer.PathBuffer))
1981	goto out;
1982	uname = Add2Ptr(
1983	rp, offsetof(struct REPARSE_DATA_BUFFER,
1984	SymbolicLinkReparseBuffer.PathBuffer) +
1985	le16_to_cpu(rp->SymbolicLinkReparseBuffer
1986	.PrintNameOffset));
1987	ulen = le16_to_cpu(
1988	rp->SymbolicLinkReparseBuffer.PrintNameLength);
1989	break;
1990
1991	case IO_REPARSE_TAG_CLOUD:
1992	case IO_REPARSE_TAG_CLOUD_1:
1993	case IO_REPARSE_TAG_CLOUD_2:
1994	case IO_REPARSE_TAG_CLOUD_3:
1995	case IO_REPARSE_TAG_CLOUD_4:
1996	case IO_REPARSE_TAG_CLOUD_5:
1997	case IO_REPARSE_TAG_CLOUD_6:
1998	case IO_REPARSE_TAG_CLOUD_7:
1999	case IO_REPARSE_TAG_CLOUD_8:
2000	case IO_REPARSE_TAG_CLOUD_9:
2001	case IO_REPARSE_TAG_CLOUD_A:
2002	case IO_REPARSE_TAG_CLOUD_B:
2003	case IO_REPARSE_TAG_CLOUD_C:
2004	case IO_REPARSE_TAG_CLOUD_D:
2005	case IO_REPARSE_TAG_CLOUD_E:
2006	case IO_REPARSE_TAG_CLOUD_F:
2007	err = sizeof("OneDrive") - 1;
2008	if (err > buflen)
2009	err = buflen;
2010	memcpy(buffer, "OneDrive", err);
2011	goto out;
2012
2013	default:
2014	if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2015	/* Unknown Microsoft Tag. */
2016	goto out;
2017	}
2018	if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2019	size <= sizeof(struct REPARSE_POINT)) {
2020	goto out;
2021	}
2022
2023	/* Users tag. */
2024	uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2025	ulen = le16_to_cpu(rp->ReparseDataLength) -
2026	sizeof(struct REPARSE_POINT);
2027	}
2028
2029	/* Convert nlen from bytes to UNICODE chars. */
2030	ulen >>= 1;
2031
2032	/* Check that name is available. */
2033	if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2034	goto out;
2035
2036	/* If name is already zero terminated then truncate it now. */
2037	if (!uname[ulen - 1])
2038	ulen -= 1;
2039
2040	err = ntfs_utf16_to_nls(sbi, name: uname, len: ulen, buf: buffer, buf_len: buflen);
2041
2042	if (err < 0)
2043	goto out;
2044
2045	/* Translate Windows '\' into Linux '/'. */
2046	for (i = 0; i < err; i++) {
2047	if (buffer[i] == '\\')
2048	buffer[i] = '/';
2049	}
2050
2051	/* Always set last zero. */
2052	buffer[err] = 0;
2053
2054	/* If this is a junction, translate the link target. */
2055	if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2056	err = ntfs_translate_junction(sb, link_de, target: buffer, target_len: err, target_max: buflen);
2057
2058	out:
2059	kfree(objp: to_free);
2060	return err;
2061	}
2062
2063	static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2064	struct delayed_call *done)
2065	{
2066	int err;
2067	char *ret;
2068
2069	if (!de)
2070	return ERR_PTR(error: -ECHILD);
2071
2072	ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2073	if (!ret)
2074	return ERR_PTR(error: -ENOMEM);
2075
2076	err = ntfs_readlink_hlp(link_de: de, inode, buffer: ret, PAGE_SIZE);
2077	if (err < 0) {
2078	kfree(objp: ret);
2079	return ERR_PTR(error: err);
2080	}
2081
2082	set_delayed_call(call: done, fn: kfree_link, arg: ret);
2083
2084	return ret;
2085	}
2086
2087	// clang-format off
2088	const struct inode_operations ntfs_link_inode_operations = {
2089	.get_link = ntfs_get_link,
2090	.setattr = ntfs_setattr,
2091	.listxattr = ntfs_listxattr,
2092	};
2093
2094	const struct address_space_operations ntfs_aops = {
2095	.read_folio = ntfs_read_folio,
2096	.readahead = ntfs_readahead,
2097	.writepages = ntfs_writepages,
2098	.write_begin = ntfs_write_begin,
2099	.write_end = ntfs_write_end,
2100	.direct_IO = ntfs_direct_IO,
2101	.bmap = ntfs_bmap,
2102	.dirty_folio = block_dirty_folio,
2103	.migrate_folio = buffer_migrate_folio,
2104	.invalidate_folio = block_invalidate_folio,
2105	};
2106
2107	const struct address_space_operations ntfs_aops_cmpr = {
2108	.read_folio = ntfs_read_folio,
2109	.dirty_folio = block_dirty_folio,
2110	.direct_IO = ntfs_direct_IO,
2111	};
2112	// clang-format on
2113