xref: /openbmc/linux/fs/ntfs3/inode.c (revision b7d6e724)
1  // SPDX-License-Identifier: GPL-2.0
2  /*
3   *
4   * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
5   *
6   */
7  
8  #include <linux/buffer_head.h>
9  #include <linux/fs.h>
10  #include <linux/mpage.h>
11  #include <linux/namei.h>
12  #include <linux/nls.h>
13  #include <linux/uio.h>
14  #include <linux/writeback.h>
15  
16  #include "debug.h"
17  #include "ntfs.h"
18  #include "ntfs_fs.h"
19  
20  /*
21   * ntfs_read_mft - Read record and parses MFT.
22   */
23  static struct inode *ntfs_read_mft(struct inode *inode,
24  				   const struct cpu_str *name,
25  				   const struct MFT_REF *ref)
26  {
27  	int err = 0;
28  	struct ntfs_inode *ni = ntfs_i(inode);
29  	struct super_block *sb = inode->i_sb;
30  	struct ntfs_sb_info *sbi = sb->s_fs_info;
31  	mode_t mode = 0;
32  	struct ATTR_STD_INFO5 *std5 = NULL;
33  	struct ATTR_LIST_ENTRY *le;
34  	struct ATTRIB *attr;
35  	bool is_match = false;
36  	bool is_root = false;
37  	bool is_dir;
38  	unsigned long ino = inode->i_ino;
39  	u32 rp_fa = 0, asize, t32;
40  	u16 roff, rsize, names = 0, links = 0;
41  	const struct ATTR_FILE_NAME *fname = NULL;
42  	const struct INDEX_ROOT *root;
43  	struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
44  	u64 t64;
45  	struct MFT_REC *rec;
46  	struct runs_tree *run;
47  	struct timespec64 ctime;
48  
49  	inode->i_op = NULL;
50  	/* Setup 'uid' and 'gid' */
51  	inode->i_uid = sbi->options->fs_uid;
52  	inode->i_gid = sbi->options->fs_gid;
53  
54  	err = mi_init(&ni->mi, sbi, ino);
55  	if (err)
56  		goto out;
57  
58  	if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
59  		t64 = sbi->mft.lbo >> sbi->cluster_bits;
60  		t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
61  		sbi->mft.ni = ni;
62  		init_rwsem(&ni->file.run_lock);
63  
64  		if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
65  			err = -ENOMEM;
66  			goto out;
67  		}
68  	}
69  
70  	err = mi_read(&ni->mi, ino == MFT_REC_MFT);
71  
72  	if (err)
73  		goto out;
74  
75  	rec = ni->mi.mrec;
76  
77  	if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
78  		;
79  	} else if (ref->seq != rec->seq) {
80  		err = -EINVAL;
81  		ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
82  			 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
83  		goto out;
84  	} else if (!is_rec_inuse(rec)) {
85  		err = -ESTALE;
86  		ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
87  		goto out;
88  	}
89  
90  	if (le32_to_cpu(rec->total) != sbi->record_size) {
91  		/* Bad inode? */
92  		err = -EINVAL;
93  		goto out;
94  	}
95  
96  	if (!is_rec_base(rec)) {
97  		err = -EINVAL;
98  		goto out;
99  	}
100  
101  	/* Record should contain $I30 root. */
102  	is_dir = rec->flags & RECORD_FLAG_DIR;
103  
104  	/* MFT_REC_MFT is not a dir */
105  	if (is_dir && ino == MFT_REC_MFT) {
106  		err = -EINVAL;
107  		goto out;
108  	}
109  
110  	inode->i_generation = le16_to_cpu(rec->seq);
111  
112  	/* Enumerate all struct Attributes MFT. */
113  	le = NULL;
114  	attr = NULL;
115  
116  	/*
117  	 * To reduce tab pressure use goto instead of
118  	 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
119  	 */
120  next_attr:
121  	run = NULL;
122  	err = -EINVAL;
123  	attr = ni_enum_attr_ex(ni, attr, &le, NULL);
124  	if (!attr)
125  		goto end_enum;
126  
127  	if (le && le->vcn) {
128  		/* This is non primary attribute segment. Ignore if not MFT. */
129  		if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
130  			goto next_attr;
131  
132  		run = &ni->file.run;
133  		asize = le32_to_cpu(attr->size);
134  		goto attr_unpack_run;
135  	}
136  
137  	roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
138  	rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
139  	asize = le32_to_cpu(attr->size);
140  
141  	/*
142  	 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'.
143  	 * There not critical to check this case again
144  	 */
145  	if (attr->name_len &&
146  	    sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) >
147  		    asize)
148  		goto out;
149  
150  	if (attr->non_res) {
151  		t64 = le64_to_cpu(attr->nres.alloc_size);
152  		if (le64_to_cpu(attr->nres.data_size) > t64 ||
153  		    le64_to_cpu(attr->nres.valid_size) > t64)
154  			goto out;
155  	}
156  
157  	switch (attr->type) {
158  	case ATTR_STD:
159  		if (attr->non_res ||
160  		    asize < sizeof(struct ATTR_STD_INFO) + roff ||
161  		    rsize < sizeof(struct ATTR_STD_INFO))
162  			goto out;
163  
164  		if (std5)
165  			goto next_attr;
166  
167  		std5 = Add2Ptr(attr, roff);
168  
169  #ifdef STATX_BTIME
170  		nt2kernel(std5->cr_time, &ni->i_crtime);
171  #endif
172  		nt2kernel(std5->a_time, &inode->i_atime);
173  		nt2kernel(std5->c_time, &ctime);
174  		inode_set_ctime_to_ts(inode, ctime);
175  		nt2kernel(std5->m_time, &inode->i_mtime);
176  
177  		ni->std_fa = std5->fa;
178  
179  		if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
180  		    rsize >= sizeof(struct ATTR_STD_INFO5))
181  			ni->std_security_id = std5->security_id;
182  		goto next_attr;
183  
184  	case ATTR_LIST:
185  		if (attr->name_len || le || ino == MFT_REC_LOG)
186  			goto out;
187  
188  		err = ntfs_load_attr_list(ni, attr);
189  		if (err)
190  			goto out;
191  
192  		le = NULL;
193  		attr = NULL;
194  		goto next_attr;
195  
196  	case ATTR_NAME:
197  		if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
198  		    rsize < SIZEOF_ATTRIBUTE_FILENAME)
199  			goto out;
200  
201  		names += 1;
202  		fname = Add2Ptr(attr, roff);
203  		if (fname->type == FILE_NAME_DOS)
204  			goto next_attr;
205  
206  		links += 1;
207  		if (name && name->len == fname->name_len &&
208  		    !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
209  					NULL, false))
210  			is_match = true;
211  
212  		goto next_attr;
213  
214  	case ATTR_DATA:
215  		if (is_dir) {
216  			/* Ignore data attribute in dir record. */
217  			goto next_attr;
218  		}
219  
220  		if (ino == MFT_REC_BADCLUST && !attr->non_res)
221  			goto next_attr;
222  
223  		if (attr->name_len &&
224  		    ((ino != MFT_REC_BADCLUST || !attr->non_res ||
225  		      attr->name_len != ARRAY_SIZE(BAD_NAME) ||
226  		      memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
227  		     (ino != MFT_REC_SECURE || !attr->non_res ||
228  		      attr->name_len != ARRAY_SIZE(SDS_NAME) ||
229  		      memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
230  			/* File contains stream attribute. Ignore it. */
231  			goto next_attr;
232  		}
233  
234  		if (is_attr_sparsed(attr))
235  			ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
236  		else
237  			ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
238  
239  		if (is_attr_compressed(attr))
240  			ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
241  		else
242  			ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
243  
244  		if (is_attr_encrypted(attr))
245  			ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
246  		else
247  			ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
248  
249  		if (!attr->non_res) {
250  			ni->i_valid = inode->i_size = rsize;
251  			inode_set_bytes(inode, rsize);
252  		}
253  
254  		mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
255  
256  		if (!attr->non_res) {
257  			ni->ni_flags |= NI_FLAG_RESIDENT;
258  			goto next_attr;
259  		}
260  
261  		inode_set_bytes(inode, attr_ondisk_size(attr));
262  
263  		ni->i_valid = le64_to_cpu(attr->nres.valid_size);
264  		inode->i_size = le64_to_cpu(attr->nres.data_size);
265  		if (!attr->nres.alloc_size)
266  			goto next_attr;
267  
268  		run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
269  					      &ni->file.run;
270  		break;
271  
272  	case ATTR_ROOT:
273  		if (attr->non_res)
274  			goto out;
275  
276  		root = Add2Ptr(attr, roff);
277  
278  		if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
279  		    memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
280  			goto next_attr;
281  
282  		if (root->type != ATTR_NAME ||
283  		    root->rule != NTFS_COLLATION_TYPE_FILENAME)
284  			goto out;
285  
286  		if (!is_dir)
287  			goto next_attr;
288  
289  		is_root = true;
290  		ni->ni_flags |= NI_FLAG_DIR;
291  
292  		err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
293  		if (err)
294  			goto out;
295  
296  		mode = sb->s_root ?
297  			       (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
298  			       (S_IFDIR | 0777);
299  		goto next_attr;
300  
301  	case ATTR_ALLOC:
302  		if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
303  		    memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
304  			goto next_attr;
305  
306  		inode->i_size = le64_to_cpu(attr->nres.data_size);
307  		ni->i_valid = le64_to_cpu(attr->nres.valid_size);
308  		inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
309  
310  		run = &ni->dir.alloc_run;
311  		break;
312  
313  	case ATTR_BITMAP:
314  		if (ino == MFT_REC_MFT) {
315  			if (!attr->non_res)
316  				goto out;
317  #ifndef CONFIG_NTFS3_64BIT_CLUSTER
318  			/* 0x20000000 = 2^32 / 8 */
319  			if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
320  				goto out;
321  #endif
322  			run = &sbi->mft.bitmap.run;
323  			break;
324  		} else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
325  			   !memcmp(attr_name(attr), I30_NAME,
326  				   sizeof(I30_NAME)) &&
327  			   attr->non_res) {
328  			run = &ni->dir.bitmap_run;
329  			break;
330  		}
331  		goto next_attr;
332  
333  	case ATTR_REPARSE:
334  		if (attr->name_len)
335  			goto next_attr;
336  
337  		rp_fa = ni_parse_reparse(ni, attr, &rp);
338  		switch (rp_fa) {
339  		case REPARSE_LINK:
340  			/*
341  			 * Normal symlink.
342  			 * Assume one unicode symbol == one utf8.
343  			 */
344  			inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
345  							    .PrintNameLength) /
346  					sizeof(u16);
347  
348  			ni->i_valid = inode->i_size;
349  
350  			/* Clear directory bit. */
351  			if (ni->ni_flags & NI_FLAG_DIR) {
352  				indx_clear(&ni->dir);
353  				memset(&ni->dir, 0, sizeof(ni->dir));
354  				ni->ni_flags &= ~NI_FLAG_DIR;
355  			} else {
356  				run_close(&ni->file.run);
357  			}
358  			mode = S_IFLNK | 0777;
359  			is_dir = false;
360  			if (attr->non_res) {
361  				run = &ni->file.run;
362  				goto attr_unpack_run; // Double break.
363  			}
364  			break;
365  
366  		case REPARSE_COMPRESSED:
367  			break;
368  
369  		case REPARSE_DEDUPLICATED:
370  			break;
371  		}
372  		goto next_attr;
373  
374  	case ATTR_EA_INFO:
375  		if (!attr->name_len &&
376  		    resident_data_ex(attr, sizeof(struct EA_INFO))) {
377  			ni->ni_flags |= NI_FLAG_EA;
378  			/*
379  			 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
380  			 */
381  			inode->i_mode = mode;
382  			ntfs_get_wsl_perm(inode);
383  			mode = inode->i_mode;
384  		}
385  		goto next_attr;
386  
387  	default:
388  		goto next_attr;
389  	}
390  
391  attr_unpack_run:
392  	roff = le16_to_cpu(attr->nres.run_off);
393  
394  	if (roff > asize) {
395  		err = -EINVAL;
396  		goto out;
397  	}
398  
399  	t64 = le64_to_cpu(attr->nres.svcn);
400  
401  	err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
402  			    t64, Add2Ptr(attr, roff), asize - roff);
403  	if (err < 0)
404  		goto out;
405  	err = 0;
406  	goto next_attr;
407  
408  end_enum:
409  
410  	if (!std5)
411  		goto out;
412  
413  	if (!is_match && name) {
414  		err = -ENOENT;
415  		goto out;
416  	}
417  
418  	if (std5->fa & FILE_ATTRIBUTE_READONLY)
419  		mode &= ~0222;
420  
421  	if (!names) {
422  		err = -EINVAL;
423  		goto out;
424  	}
425  
426  	if (names != le16_to_cpu(rec->hard_links)) {
427  		/* Correct minor error on the fly. Do not mark inode as dirty. */
428  		ntfs_inode_warn(inode, "Correct links count -> %u.", names);
429  		rec->hard_links = cpu_to_le16(names);
430  		ni->mi.dirty = true;
431  	}
432  
433  	set_nlink(inode, links);
434  
435  	if (S_ISDIR(mode)) {
436  		ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
437  
438  		/*
439  		 * Dot and dot-dot should be included in count but was not
440  		 * included in enumeration.
441  		 * Usually a hard links to directories are disabled.
442  		 */
443  		inode->i_op = &ntfs_dir_inode_operations;
444  		inode->i_fop = &ntfs_dir_operations;
445  		ni->i_valid = 0;
446  	} else if (S_ISLNK(mode)) {
447  		ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
448  		inode->i_op = &ntfs_link_inode_operations;
449  		inode->i_fop = NULL;
450  		inode_nohighmem(inode);
451  	} else if (S_ISREG(mode)) {
452  		ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
453  		inode->i_op = &ntfs_file_inode_operations;
454  		inode->i_fop = &ntfs_file_operations;
455  		inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
456  							      &ntfs_aops;
457  		if (ino != MFT_REC_MFT)
458  			init_rwsem(&ni->file.run_lock);
459  	} else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
460  		   S_ISSOCK(mode)) {
461  		inode->i_op = &ntfs_special_inode_operations;
462  		init_special_inode(inode, mode, inode->i_rdev);
463  	} else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
464  		   fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
465  		/* Records in $Extend are not a files or general directories. */
466  		inode->i_op = &ntfs_file_inode_operations;
467  	} else {
468  		err = -EINVAL;
469  		goto out;
470  	}
471  
472  	if ((sbi->options->sys_immutable &&
473  	     (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
474  	    !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
475  		inode->i_flags |= S_IMMUTABLE;
476  	} else {
477  		inode->i_flags &= ~S_IMMUTABLE;
478  	}
479  
480  	inode->i_mode = mode;
481  	if (!(ni->ni_flags & NI_FLAG_EA)) {
482  		/* If no xattr then no security (stored in xattr). */
483  		inode->i_flags |= S_NOSEC;
484  	}
485  
486  	if (ino == MFT_REC_MFT && !sb->s_root)
487  		sbi->mft.ni = NULL;
488  
489  	unlock_new_inode(inode);
490  
491  	return inode;
492  
493  out:
494  	if (ino == MFT_REC_MFT && !sb->s_root)
495  		sbi->mft.ni = NULL;
496  
497  	iget_failed(inode);
498  	return ERR_PTR(err);
499  }
500  
501  /*
502   * ntfs_test_inode
503   *
504   * Return: 1 if match.
505   */
506  static int ntfs_test_inode(struct inode *inode, void *data)
507  {
508  	struct MFT_REF *ref = data;
509  
510  	return ino_get(ref) == inode->i_ino;
511  }
512  
513  static int ntfs_set_inode(struct inode *inode, void *data)
514  {
515  	const struct MFT_REF *ref = data;
516  
517  	inode->i_ino = ino_get(ref);
518  	return 0;
519  }
520  
521  struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
522  			 const struct cpu_str *name)
523  {
524  	struct inode *inode;
525  
526  	inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
527  			     (void *)ref);
528  	if (unlikely(!inode))
529  		return ERR_PTR(-ENOMEM);
530  
531  	/* If this is a freshly allocated inode, need to read it now. */
532  	if (inode->i_state & I_NEW)
533  		inode = ntfs_read_mft(inode, name, ref);
534  	else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
535  		/* Inode overlaps? */
536  		_ntfs_bad_inode(inode);
537  	}
538  
539  	if (IS_ERR(inode) && name)
540  		ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
541  
542  	return inode;
543  }
544  
545  enum get_block_ctx {
546  	GET_BLOCK_GENERAL = 0,
547  	GET_BLOCK_WRITE_BEGIN = 1,
548  	GET_BLOCK_DIRECT_IO_R = 2,
549  	GET_BLOCK_DIRECT_IO_W = 3,
550  	GET_BLOCK_BMAP = 4,
551  };
552  
553  static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
554  				       struct buffer_head *bh, int create,
555  				       enum get_block_ctx ctx)
556  {
557  	struct super_block *sb = inode->i_sb;
558  	struct ntfs_sb_info *sbi = sb->s_fs_info;
559  	struct ntfs_inode *ni = ntfs_i(inode);
560  	struct folio *folio = bh->b_folio;
561  	u8 cluster_bits = sbi->cluster_bits;
562  	u32 block_size = sb->s_blocksize;
563  	u64 bytes, lbo, valid;
564  	u32 off;
565  	int err;
566  	CLST vcn, lcn, len;
567  	bool new;
568  
569  	/* Clear previous state. */
570  	clear_buffer_new(bh);
571  	clear_buffer_uptodate(bh);
572  
573  	if (is_resident(ni)) {
574  		bh->b_blocknr = RESIDENT_LCN;
575  		bh->b_size = block_size;
576  		if (!folio) {
577  			err = 0;
578  		} else {
579  			ni_lock(ni);
580  			err = attr_data_read_resident(ni, &folio->page);
581  			ni_unlock(ni);
582  
583  			if (!err)
584  				set_buffer_uptodate(bh);
585  		}
586  		return err;
587  	}
588  
589  	vcn = vbo >> cluster_bits;
590  	off = vbo & sbi->cluster_mask;
591  	new = false;
592  
593  	err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
594  				  create && sbi->cluster_size > PAGE_SIZE);
595  	if (err)
596  		goto out;
597  
598  	if (!len)
599  		return 0;
600  
601  	bytes = ((u64)len << cluster_bits) - off;
602  
603  	if (lcn == SPARSE_LCN) {
604  		if (!create) {
605  			if (bh->b_size > bytes)
606  				bh->b_size = bytes;
607  			return 0;
608  		}
609  		WARN_ON(1);
610  	}
611  
612  	if (new)
613  		set_buffer_new(bh);
614  
615  	lbo = ((u64)lcn << cluster_bits) + off;
616  
617  	set_buffer_mapped(bh);
618  	bh->b_bdev = sb->s_bdev;
619  	bh->b_blocknr = lbo >> sb->s_blocksize_bits;
620  
621  	valid = ni->i_valid;
622  
623  	if (ctx == GET_BLOCK_DIRECT_IO_W) {
624  		/* ntfs_direct_IO will update ni->i_valid. */
625  		if (vbo >= valid)
626  			set_buffer_new(bh);
627  	} else if (create) {
628  		/* Normal write. */
629  		if (bytes > bh->b_size)
630  			bytes = bh->b_size;
631  
632  		if (vbo >= valid)
633  			set_buffer_new(bh);
634  
635  		if (vbo + bytes > valid) {
636  			ni->i_valid = vbo + bytes;
637  			mark_inode_dirty(inode);
638  		}
639  	} else if (vbo >= valid) {
640  		/* Read out of valid data. */
641  		clear_buffer_mapped(bh);
642  	} else if (vbo + bytes <= valid) {
643  		/* Normal read. */
644  	} else if (vbo + block_size <= valid) {
645  		/* Normal short read. */
646  		bytes = block_size;
647  	} else {
648  		/*
649  		 * Read across valid size: vbo < valid && valid < vbo + block_size
650  		 */
651  		bytes = block_size;
652  
653  		if (folio) {
654  			u32 voff = valid - vbo;
655  
656  			bh->b_size = block_size;
657  			off = vbo & (PAGE_SIZE - 1);
658  			folio_set_bh(bh, folio, off);
659  
660  			err = bh_read(bh, 0);
661  			if (err < 0)
662  				goto out;
663  			folio_zero_segment(folio, off + voff, off + block_size);
664  		}
665  	}
666  
667  	if (bh->b_size > bytes)
668  		bh->b_size = bytes;
669  
670  #ifndef __LP64__
671  	if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
672  		static_assert(sizeof(size_t) < sizeof(loff_t));
673  		if (bytes > 0x40000000u)
674  			bh->b_size = 0x40000000u;
675  	}
676  #endif
677  
678  	return 0;
679  
680  out:
681  	return err;
682  }
683  
684  int ntfs_get_block(struct inode *inode, sector_t vbn,
685  		   struct buffer_head *bh_result, int create)
686  {
687  	return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
688  				  bh_result, create, GET_BLOCK_GENERAL);
689  }
690  
691  static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
692  			       struct buffer_head *bh_result, int create)
693  {
694  	return ntfs_get_block_vbo(inode,
695  				  (u64)vsn << inode->i_sb->s_blocksize_bits,
696  				  bh_result, create, GET_BLOCK_BMAP);
697  }
698  
699  static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
700  {
701  	return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
702  }
703  
704  static int ntfs_read_folio(struct file *file, struct folio *folio)
705  {
706  	struct page *page = &folio->page;
707  	int err;
708  	struct address_space *mapping = page->mapping;
709  	struct inode *inode = mapping->host;
710  	struct ntfs_inode *ni = ntfs_i(inode);
711  
712  	if (is_resident(ni)) {
713  		ni_lock(ni);
714  		err = attr_data_read_resident(ni, page);
715  		ni_unlock(ni);
716  		if (err != E_NTFS_NONRESIDENT) {
717  			unlock_page(page);
718  			return err;
719  		}
720  	}
721  
722  	if (is_compressed(ni)) {
723  		ni_lock(ni);
724  		err = ni_readpage_cmpr(ni, page);
725  		ni_unlock(ni);
726  		return err;
727  	}
728  
729  	/* Normal + sparse files. */
730  	return mpage_read_folio(folio, ntfs_get_block);
731  }
732  
733  static void ntfs_readahead(struct readahead_control *rac)
734  {
735  	struct address_space *mapping = rac->mapping;
736  	struct inode *inode = mapping->host;
737  	struct ntfs_inode *ni = ntfs_i(inode);
738  	u64 valid;
739  	loff_t pos;
740  
741  	if (is_resident(ni)) {
742  		/* No readahead for resident. */
743  		return;
744  	}
745  
746  	if (is_compressed(ni)) {
747  		/* No readahead for compressed. */
748  		return;
749  	}
750  
751  	valid = ni->i_valid;
752  	pos = readahead_pos(rac);
753  
754  	if (valid < i_size_read(inode) && pos <= valid &&
755  	    valid < pos + readahead_length(rac)) {
756  		/* Range cross 'valid'. Read it page by page. */
757  		return;
758  	}
759  
760  	mpage_readahead(rac, ntfs_get_block);
761  }
762  
763  static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
764  				      struct buffer_head *bh_result, int create)
765  {
766  	return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
767  				  bh_result, create, GET_BLOCK_DIRECT_IO_R);
768  }
769  
770  static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
771  				      struct buffer_head *bh_result, int create)
772  {
773  	return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
774  				  bh_result, create, GET_BLOCK_DIRECT_IO_W);
775  }
776  
777  static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
778  {
779  	struct file *file = iocb->ki_filp;
780  	struct address_space *mapping = file->f_mapping;
781  	struct inode *inode = mapping->host;
782  	struct ntfs_inode *ni = ntfs_i(inode);
783  	loff_t vbo = iocb->ki_pos;
784  	loff_t end;
785  	int wr = iov_iter_rw(iter) & WRITE;
786  	size_t iter_count = iov_iter_count(iter);
787  	loff_t valid;
788  	ssize_t ret;
789  
790  	if (is_resident(ni)) {
791  		/* Switch to buffered write. */
792  		ret = 0;
793  		goto out;
794  	}
795  
796  	ret = blockdev_direct_IO(iocb, inode, iter,
797  				 wr ? ntfs_get_block_direct_IO_W :
798  				      ntfs_get_block_direct_IO_R);
799  
800  	if (ret > 0)
801  		end = vbo + ret;
802  	else if (wr && ret == -EIOCBQUEUED)
803  		end = vbo + iter_count;
804  	else
805  		goto out;
806  
807  	valid = ni->i_valid;
808  	if (wr) {
809  		if (end > valid && !S_ISBLK(inode->i_mode)) {
810  			ni->i_valid = end;
811  			mark_inode_dirty(inode);
812  		}
813  	} else if (vbo < valid && valid < end) {
814  		/* Fix page. */
815  		iov_iter_revert(iter, end - valid);
816  		iov_iter_zero(end - valid, iter);
817  	}
818  
819  out:
820  	return ret;
821  }
822  
823  int ntfs_set_size(struct inode *inode, u64 new_size)
824  {
825  	struct super_block *sb = inode->i_sb;
826  	struct ntfs_sb_info *sbi = sb->s_fs_info;
827  	struct ntfs_inode *ni = ntfs_i(inode);
828  	int err;
829  
830  	/* Check for maximum file size. */
831  	if (is_sparsed(ni) || is_compressed(ni)) {
832  		if (new_size > sbi->maxbytes_sparse) {
833  			err = -EFBIG;
834  			goto out;
835  		}
836  	} else if (new_size > sbi->maxbytes) {
837  		err = -EFBIG;
838  		goto out;
839  	}
840  
841  	ni_lock(ni);
842  	down_write(&ni->file.run_lock);
843  
844  	err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
845  			    &ni->i_valid, true, NULL);
846  
847  	up_write(&ni->file.run_lock);
848  	ni_unlock(ni);
849  
850  	mark_inode_dirty(inode);
851  
852  out:
853  	return err;
854  }
855  
856  static int ntfs_resident_writepage(struct folio *folio,
857  				   struct writeback_control *wbc, void *data)
858  {
859  	struct address_space *mapping = data;
860  	struct inode *inode = mapping->host;
861  	struct ntfs_inode *ni = ntfs_i(inode);
862  	int ret;
863  
864  	if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
865  		return -EIO;
866  
867  	ni_lock(ni);
868  	ret = attr_data_write_resident(ni, &folio->page);
869  	ni_unlock(ni);
870  
871  	if (ret != E_NTFS_NONRESIDENT)
872  		folio_unlock(folio);
873  	mapping_set_error(mapping, ret);
874  	return ret;
875  }
876  
877  static int ntfs_writepages(struct address_space *mapping,
878  			   struct writeback_control *wbc)
879  {
880  	struct inode *inode = mapping->host;
881  
882  	if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
883  		return -EIO;
884  
885  	if (is_resident(ntfs_i(inode)))
886  		return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
887  					 mapping);
888  	return mpage_writepages(mapping, wbc, ntfs_get_block);
889  }
890  
891  static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
892  				      struct buffer_head *bh_result, int create)
893  {
894  	return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
895  				  bh_result, create, GET_BLOCK_WRITE_BEGIN);
896  }
897  
898  int ntfs_write_begin(struct file *file, struct address_space *mapping,
899  		     loff_t pos, u32 len, struct page **pagep, void **fsdata)
900  {
901  	int err;
902  	struct inode *inode = mapping->host;
903  	struct ntfs_inode *ni = ntfs_i(inode);
904  
905  	if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
906  		return -EIO;
907  
908  	*pagep = NULL;
909  	if (is_resident(ni)) {
910  		struct page *page =
911  			grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT);
912  
913  		if (!page) {
914  			err = -ENOMEM;
915  			goto out;
916  		}
917  
918  		ni_lock(ni);
919  		err = attr_data_read_resident(ni, page);
920  		ni_unlock(ni);
921  
922  		if (!err) {
923  			*pagep = page;
924  			goto out;
925  		}
926  		unlock_page(page);
927  		put_page(page);
928  
929  		if (err != E_NTFS_NONRESIDENT)
930  			goto out;
931  	}
932  
933  	err = block_write_begin(mapping, pos, len, pagep,
934  				ntfs_get_block_write_begin);
935  
936  out:
937  	return err;
938  }
939  
940  /*
941   * ntfs_write_end - Address_space_operations::write_end.
942   */
943  int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
944  		   u32 len, u32 copied, struct page *page, void *fsdata)
945  {
946  	struct inode *inode = mapping->host;
947  	struct ntfs_inode *ni = ntfs_i(inode);
948  	u64 valid = ni->i_valid;
949  	bool dirty = false;
950  	int err;
951  
952  	if (is_resident(ni)) {
953  		ni_lock(ni);
954  		err = attr_data_write_resident(ni, page);
955  		ni_unlock(ni);
956  		if (!err) {
957  			dirty = true;
958  			/* Clear any buffers in page. */
959  			if (page_has_buffers(page)) {
960  				struct buffer_head *head, *bh;
961  
962  				bh = head = page_buffers(page);
963  				do {
964  					clear_buffer_dirty(bh);
965  					clear_buffer_mapped(bh);
966  					set_buffer_uptodate(bh);
967  				} while (head != (bh = bh->b_this_page));
968  			}
969  			SetPageUptodate(page);
970  			err = copied;
971  		}
972  		unlock_page(page);
973  		put_page(page);
974  	} else {
975  		err = generic_write_end(file, mapping, pos, len, copied, page,
976  					fsdata);
977  	}
978  
979  	if (err >= 0) {
980  		if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
981  			inode->i_mtime = inode_set_ctime_current(inode);
982  			ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
983  			dirty = true;
984  		}
985  
986  		if (valid != ni->i_valid) {
987  			/* ni->i_valid is changed in ntfs_get_block_vbo. */
988  			dirty = true;
989  		}
990  
991  		if (pos + err > inode->i_size) {
992  			i_size_write(inode, pos + err);
993  			dirty = true;
994  		}
995  
996  		if (dirty)
997  			mark_inode_dirty(inode);
998  	}
999  
1000  	return err;
1001  }
1002  
1003  int reset_log_file(struct inode *inode)
1004  {
1005  	int err;
1006  	loff_t pos = 0;
1007  	u32 log_size = inode->i_size;
1008  	struct address_space *mapping = inode->i_mapping;
1009  
1010  	for (;;) {
1011  		u32 len;
1012  		void *kaddr;
1013  		struct page *page;
1014  
1015  		len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
1016  
1017  		err = block_write_begin(mapping, pos, len, &page,
1018  					ntfs_get_block_write_begin);
1019  		if (err)
1020  			goto out;
1021  
1022  		kaddr = kmap_atomic(page);
1023  		memset(kaddr, -1, len);
1024  		kunmap_atomic(kaddr);
1025  		flush_dcache_page(page);
1026  
1027  		err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
1028  		if (err < 0)
1029  			goto out;
1030  		pos += len;
1031  
1032  		if (pos >= log_size)
1033  			break;
1034  		balance_dirty_pages_ratelimited(mapping);
1035  	}
1036  out:
1037  	mark_inode_dirty_sync(inode);
1038  
1039  	return err;
1040  }
1041  
1042  int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1043  {
1044  	return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1045  }
1046  
1047  int ntfs_sync_inode(struct inode *inode)
1048  {
1049  	return _ni_write_inode(inode, 1);
1050  }
1051  
1052  /*
1053   * writeback_inode - Helper function for ntfs_flush_inodes().
1054   *
1055   * This writes both the inode and the file data blocks, waiting
1056   * for in flight data blocks before the start of the call.  It
1057   * does not wait for any io started during the call.
1058   */
1059  static int writeback_inode(struct inode *inode)
1060  {
1061  	int ret = sync_inode_metadata(inode, 0);
1062  
1063  	if (!ret)
1064  		ret = filemap_fdatawrite(inode->i_mapping);
1065  	return ret;
1066  }
1067  
1068  /*
1069   * ntfs_flush_inodes
1070   *
1071   * Write data and metadata corresponding to i1 and i2.  The io is
1072   * started but we do not wait for any of it to finish.
1073   *
1074   * filemap_flush() is used for the block device, so if there is a dirty
1075   * page for a block already in flight, we will not wait and start the
1076   * io over again.
1077   */
1078  int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1079  		      struct inode *i2)
1080  {
1081  	int ret = 0;
1082  
1083  	if (i1)
1084  		ret = writeback_inode(i1);
1085  	if (!ret && i2)
1086  		ret = writeback_inode(i2);
1087  	if (!ret)
1088  		ret = sync_blockdev_nowait(sb->s_bdev);
1089  	return ret;
1090  }
1091  
1092  int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1093  {
1094  	pgoff_t idx;
1095  
1096  	/* Write non resident data. */
1097  	for (idx = 0; bytes; idx++) {
1098  		size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1099  		struct page *page = ntfs_map_page(inode->i_mapping, idx);
1100  
1101  		if (IS_ERR(page))
1102  			return PTR_ERR(page);
1103  
1104  		lock_page(page);
1105  		WARN_ON(!PageUptodate(page));
1106  		ClearPageUptodate(page);
1107  
1108  		memcpy(page_address(page), data, op);
1109  
1110  		flush_dcache_page(page);
1111  		SetPageUptodate(page);
1112  		unlock_page(page);
1113  
1114  		ntfs_unmap_page(page);
1115  
1116  		bytes -= op;
1117  		data = Add2Ptr(data, PAGE_SIZE);
1118  	}
1119  	return 0;
1120  }
1121  
1122  /*
1123   * ntfs_reparse_bytes
1124   *
1125   * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1126   * for unicode string of @uni_len length.
1127   */
1128  static inline u32 ntfs_reparse_bytes(u32 uni_len)
1129  {
1130  	/* Header + unicode string + decorated unicode string. */
1131  	return sizeof(short) * (2 * uni_len + 4) +
1132  	       offsetof(struct REPARSE_DATA_BUFFER,
1133  			SymbolicLinkReparseBuffer.PathBuffer);
1134  }
1135  
1136  static struct REPARSE_DATA_BUFFER *
1137  ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1138  			   u32 size, u16 *nsize)
1139  {
1140  	int i, err;
1141  	struct REPARSE_DATA_BUFFER *rp;
1142  	__le16 *rp_name;
1143  	typeof(rp->SymbolicLinkReparseBuffer) *rs;
1144  
1145  	rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1146  	if (!rp)
1147  		return ERR_PTR(-ENOMEM);
1148  
1149  	rs = &rp->SymbolicLinkReparseBuffer;
1150  	rp_name = rs->PathBuffer;
1151  
1152  	/* Convert link name to UTF-16. */
1153  	err = ntfs_nls_to_utf16(sbi, symname, size,
1154  				(struct cpu_str *)(rp_name - 1), 2 * size,
1155  				UTF16_LITTLE_ENDIAN);
1156  	if (err < 0)
1157  		goto out;
1158  
1159  	/* err = the length of unicode name of symlink. */
1160  	*nsize = ntfs_reparse_bytes(err);
1161  
1162  	if (*nsize > sbi->reparse.max_size) {
1163  		err = -EFBIG;
1164  		goto out;
1165  	}
1166  
1167  	/* Translate Linux '/' into Windows '\'. */
1168  	for (i = 0; i < err; i++) {
1169  		if (rp_name[i] == cpu_to_le16('/'))
1170  			rp_name[i] = cpu_to_le16('\\');
1171  	}
1172  
1173  	rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1174  	rp->ReparseDataLength =
1175  		cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1176  					      SymbolicLinkReparseBuffer));
1177  
1178  	/* PrintName + SubstituteName. */
1179  	rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1180  	rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1181  	rs->PrintNameLength = rs->SubstituteNameOffset;
1182  
1183  	/*
1184  	 * TODO: Use relative path if possible to allow Windows to
1185  	 * parse this path.
1186  	 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1187  	 */
1188  	rs->Flags = 0;
1189  
1190  	memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1191  
1192  	/* Decorate SubstituteName. */
1193  	rp_name += err;
1194  	rp_name[0] = cpu_to_le16('\\');
1195  	rp_name[1] = cpu_to_le16('?');
1196  	rp_name[2] = cpu_to_le16('?');
1197  	rp_name[3] = cpu_to_le16('\\');
1198  
1199  	return rp;
1200  out:
1201  	kfree(rp);
1202  	return ERR_PTR(err);
1203  }
1204  
1205  /*
1206   * ntfs_create_inode
1207   *
1208   * Helper function for:
1209   * - ntfs_create
1210   * - ntfs_mknod
1211   * - ntfs_symlink
1212   * - ntfs_mkdir
1213   * - ntfs_atomic_open
1214   *
1215   * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1216   */
1217  struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1218  				struct dentry *dentry,
1219  				const struct cpu_str *uni, umode_t mode,
1220  				dev_t dev, const char *symname, u32 size,
1221  				struct ntfs_fnd *fnd)
1222  {
1223  	int err;
1224  	struct super_block *sb = dir->i_sb;
1225  	struct ntfs_sb_info *sbi = sb->s_fs_info;
1226  	const struct qstr *name = &dentry->d_name;
1227  	CLST ino = 0;
1228  	struct ntfs_inode *dir_ni = ntfs_i(dir);
1229  	struct ntfs_inode *ni = NULL;
1230  	struct inode *inode = NULL;
1231  	struct ATTRIB *attr;
1232  	struct ATTR_STD_INFO5 *std5;
1233  	struct ATTR_FILE_NAME *fname;
1234  	struct MFT_REC *rec;
1235  	u32 asize, dsize, sd_size;
1236  	enum FILE_ATTRIBUTE fa;
1237  	__le32 security_id = SECURITY_ID_INVALID;
1238  	CLST vcn;
1239  	const void *sd;
1240  	u16 t16, nsize = 0, aid = 0;
1241  	struct INDEX_ROOT *root, *dir_root;
1242  	struct NTFS_DE *e, *new_de = NULL;
1243  	struct REPARSE_DATA_BUFFER *rp = NULL;
1244  	bool rp_inserted = false;
1245  
1246  	if (!fnd)
1247  		ni_lock_dir(dir_ni);
1248  
1249  	dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1250  	if (!dir_root) {
1251  		err = -EINVAL;
1252  		goto out1;
1253  	}
1254  
1255  	if (S_ISDIR(mode)) {
1256  		/* Use parent's directory attributes. */
1257  		fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1258  		     FILE_ATTRIBUTE_ARCHIVE;
1259  		/*
1260  		 * By default child directory inherits parent attributes.
1261  		 * Root directory is hidden + system.
1262  		 * Make an exception for children in root.
1263  		 */
1264  		if (dir->i_ino == MFT_REC_ROOT)
1265  			fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1266  	} else if (S_ISLNK(mode)) {
1267  		/* It is good idea that link should be the same type (file/dir) as target */
1268  		fa = FILE_ATTRIBUTE_REPARSE_POINT;
1269  
1270  		/*
1271  		 * Linux: there are dir/file/symlink and so on.
1272  		 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1273  		 * It is good idea to create:
1274  		 * dir + reparse if 'symname' points to directory
1275  		 * or
1276  		 * file + reparse if 'symname' points to file
1277  		 * Unfortunately kern_path hangs if symname contains 'dir'.
1278  		 */
1279  
1280  		/*
1281  		 *	struct path path;
1282  		 *
1283  		 *	if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1284  		 *		struct inode *target = d_inode(path.dentry);
1285  		 *
1286  		 *		if (S_ISDIR(target->i_mode))
1287  		 *			fa |= FILE_ATTRIBUTE_DIRECTORY;
1288  		 *		// if ( target->i_sb == sb ){
1289  		 *		//	use relative path?
1290  		 *		// }
1291  		 *		path_put(&path);
1292  		 *	}
1293  		 */
1294  	} else if (S_ISREG(mode)) {
1295  		if (sbi->options->sparse) {
1296  			/* Sparsed regular file, cause option 'sparse'. */
1297  			fa = FILE_ATTRIBUTE_SPARSE_FILE |
1298  			     FILE_ATTRIBUTE_ARCHIVE;
1299  		} else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1300  			/* Compressed regular file, if parent is compressed. */
1301  			fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1302  		} else {
1303  			/* Regular file, default attributes. */
1304  			fa = FILE_ATTRIBUTE_ARCHIVE;
1305  		}
1306  	} else {
1307  		fa = FILE_ATTRIBUTE_ARCHIVE;
1308  	}
1309  
1310  	/* If option "hide_dot_files" then set hidden attribute for dot files. */
1311  	if (sbi->options->hide_dot_files && name->name[0] == '.')
1312  		fa |= FILE_ATTRIBUTE_HIDDEN;
1313  
1314  	if (!(mode & 0222))
1315  		fa |= FILE_ATTRIBUTE_READONLY;
1316  
1317  	/* Allocate PATH_MAX bytes. */
1318  	new_de = __getname();
1319  	if (!new_de) {
1320  		err = -ENOMEM;
1321  		goto out1;
1322  	}
1323  
1324  	if (unlikely(ntfs3_forced_shutdown(sb))) {
1325  		err = -EIO;
1326  		goto out2;
1327  	}
1328  
1329  	/* Mark rw ntfs as dirty. it will be cleared at umount. */
1330  	ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1331  
1332  	/* Step 1: allocate and fill new mft record. */
1333  	err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1334  	if (err)
1335  		goto out2;
1336  
1337  	ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1338  	if (IS_ERR(ni)) {
1339  		err = PTR_ERR(ni);
1340  		ni = NULL;
1341  		goto out3;
1342  	}
1343  	inode = &ni->vfs_inode;
1344  	inode_init_owner(idmap, inode, dir, mode);
1345  	mode = inode->i_mode;
1346  
1347  	ni->i_crtime = current_time(inode);
1348  
1349  	rec = ni->mi.mrec;
1350  	rec->hard_links = cpu_to_le16(1);
1351  	attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1352  
1353  	/* Get default security id. */
1354  	sd = s_default_security;
1355  	sd_size = sizeof(s_default_security);
1356  
1357  	if (is_ntfs3(sbi)) {
1358  		security_id = dir_ni->std_security_id;
1359  		if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1360  			security_id = sbi->security.def_security_id;
1361  
1362  			if (security_id == SECURITY_ID_INVALID &&
1363  			    !ntfs_insert_security(sbi, sd, sd_size,
1364  						  &security_id, NULL))
1365  				sbi->security.def_security_id = security_id;
1366  		}
1367  	}
1368  
1369  	/* Insert standard info. */
1370  	std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1371  
1372  	if (security_id == SECURITY_ID_INVALID) {
1373  		dsize = sizeof(struct ATTR_STD_INFO);
1374  	} else {
1375  		dsize = sizeof(struct ATTR_STD_INFO5);
1376  		std5->security_id = security_id;
1377  		ni->std_security_id = security_id;
1378  	}
1379  	asize = SIZEOF_RESIDENT + dsize;
1380  
1381  	attr->type = ATTR_STD;
1382  	attr->size = cpu_to_le32(asize);
1383  	attr->id = cpu_to_le16(aid++);
1384  	attr->res.data_off = SIZEOF_RESIDENT_LE;
1385  	attr->res.data_size = cpu_to_le32(dsize);
1386  
1387  	std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1388  		kernel2nt(&ni->i_crtime);
1389  
1390  	std5->fa = ni->std_fa = fa;
1391  
1392  	attr = Add2Ptr(attr, asize);
1393  
1394  	/* Insert file name. */
1395  	err = fill_name_de(sbi, new_de, name, uni);
1396  	if (err)
1397  		goto out4;
1398  
1399  	mi_get_ref(&ni->mi, &new_de->ref);
1400  
1401  	fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1402  
1403  	if (sbi->options->windows_names &&
1404  	    !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1405  		err = -EINVAL;
1406  		goto out4;
1407  	}
1408  
1409  	mi_get_ref(&dir_ni->mi, &fname->home);
1410  	fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1411  		fname->dup.a_time = std5->cr_time;
1412  	fname->dup.alloc_size = fname->dup.data_size = 0;
1413  	fname->dup.fa = std5->fa;
1414  	fname->dup.ea_size = fname->dup.reparse = 0;
1415  
1416  	dsize = le16_to_cpu(new_de->key_size);
1417  	asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1418  
1419  	attr->type = ATTR_NAME;
1420  	attr->size = cpu_to_le32(asize);
1421  	attr->res.data_off = SIZEOF_RESIDENT_LE;
1422  	attr->res.flags = RESIDENT_FLAG_INDEXED;
1423  	attr->id = cpu_to_le16(aid++);
1424  	attr->res.data_size = cpu_to_le32(dsize);
1425  	memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1426  
1427  	attr = Add2Ptr(attr, asize);
1428  
1429  	if (security_id == SECURITY_ID_INVALID) {
1430  		/* Insert security attribute. */
1431  		asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1432  
1433  		attr->type = ATTR_SECURE;
1434  		attr->size = cpu_to_le32(asize);
1435  		attr->id = cpu_to_le16(aid++);
1436  		attr->res.data_off = SIZEOF_RESIDENT_LE;
1437  		attr->res.data_size = cpu_to_le32(sd_size);
1438  		memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1439  
1440  		attr = Add2Ptr(attr, asize);
1441  	}
1442  
1443  	attr->id = cpu_to_le16(aid++);
1444  	if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1445  		/*
1446  		 * Regular directory or symlink to directory.
1447  		 * Create root attribute.
1448  		 */
1449  		dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1450  		asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1451  
1452  		attr->type = ATTR_ROOT;
1453  		attr->size = cpu_to_le32(asize);
1454  
1455  		attr->name_len = ARRAY_SIZE(I30_NAME);
1456  		attr->name_off = SIZEOF_RESIDENT_LE;
1457  		attr->res.data_off =
1458  			cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1459  		attr->res.data_size = cpu_to_le32(dsize);
1460  		memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1461  		       sizeof(I30_NAME));
1462  
1463  		root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1464  		memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1465  		root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1466  		root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1467  					      sizeof(struct NTFS_DE));
1468  		root->ihdr.total = root->ihdr.used;
1469  
1470  		e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1471  		e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1472  		e->flags = NTFS_IE_LAST;
1473  	} else if (S_ISLNK(mode)) {
1474  		/*
1475  		 * Symlink to file.
1476  		 * Create empty resident data attribute.
1477  		 */
1478  		asize = SIZEOF_RESIDENT;
1479  
1480  		/* Insert empty ATTR_DATA */
1481  		attr->type = ATTR_DATA;
1482  		attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1483  		attr->name_off = SIZEOF_RESIDENT_LE;
1484  		attr->res.data_off = SIZEOF_RESIDENT_LE;
1485  	} else if (S_ISREG(mode)) {
1486  		/*
1487  		 * Regular file. Create empty non resident data attribute.
1488  		 */
1489  		attr->type = ATTR_DATA;
1490  		attr->non_res = 1;
1491  		attr->nres.evcn = cpu_to_le64(-1ll);
1492  		if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1493  			attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1494  			attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1495  			attr->flags = ATTR_FLAG_SPARSED;
1496  			asize = SIZEOF_NONRESIDENT_EX + 8;
1497  		} else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1498  			attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1499  			attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1500  			attr->flags = ATTR_FLAG_COMPRESSED;
1501  			attr->nres.c_unit = NTFS_LZNT_CUNIT;
1502  			asize = SIZEOF_NONRESIDENT_EX + 8;
1503  		} else {
1504  			attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1505  			attr->name_off = SIZEOF_NONRESIDENT_LE;
1506  			asize = SIZEOF_NONRESIDENT + 8;
1507  		}
1508  		attr->nres.run_off = attr->name_off;
1509  	} else {
1510  		/*
1511  		 * Node. Create empty resident data attribute.
1512  		 */
1513  		attr->type = ATTR_DATA;
1514  		attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1515  		attr->name_off = SIZEOF_RESIDENT_LE;
1516  		if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1517  			attr->flags = ATTR_FLAG_SPARSED;
1518  		else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1519  			attr->flags = ATTR_FLAG_COMPRESSED;
1520  		attr->res.data_off = SIZEOF_RESIDENT_LE;
1521  		asize = SIZEOF_RESIDENT;
1522  		ni->ni_flags |= NI_FLAG_RESIDENT;
1523  	}
1524  
1525  	if (S_ISDIR(mode)) {
1526  		ni->ni_flags |= NI_FLAG_DIR;
1527  		err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1528  		if (err)
1529  			goto out4;
1530  	} else if (S_ISLNK(mode)) {
1531  		rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1532  
1533  		if (IS_ERR(rp)) {
1534  			err = PTR_ERR(rp);
1535  			rp = NULL;
1536  			goto out4;
1537  		}
1538  
1539  		/*
1540  		 * Insert ATTR_REPARSE.
1541  		 */
1542  		attr = Add2Ptr(attr, asize);
1543  		attr->type = ATTR_REPARSE;
1544  		attr->id = cpu_to_le16(aid++);
1545  
1546  		/* Resident or non resident? */
1547  		asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1548  		t16 = PtrOffset(rec, attr);
1549  
1550  		/*
1551  		 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1552  		 * It is good idea to keep extened attributes resident.
1553  		 */
1554  		if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1555  			CLST alen;
1556  			CLST clst = bytes_to_cluster(sbi, nsize);
1557  
1558  			/* Bytes per runs. */
1559  			t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1560  
1561  			attr->non_res = 1;
1562  			attr->nres.evcn = cpu_to_le64(clst - 1);
1563  			attr->name_off = SIZEOF_NONRESIDENT_LE;
1564  			attr->nres.run_off = attr->name_off;
1565  			attr->nres.data_size = cpu_to_le64(nsize);
1566  			attr->nres.valid_size = attr->nres.data_size;
1567  			attr->nres.alloc_size =
1568  				cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1569  
1570  			err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1571  						     clst, NULL, ALLOCATE_DEF,
1572  						     &alen, 0, NULL, NULL);
1573  			if (err)
1574  				goto out5;
1575  
1576  			err = run_pack(&ni->file.run, 0, clst,
1577  				       Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1578  				       &vcn);
1579  			if (err < 0)
1580  				goto out5;
1581  
1582  			if (vcn != clst) {
1583  				err = -EINVAL;
1584  				goto out5;
1585  			}
1586  
1587  			asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1588  			/* Write non resident data. */
1589  			err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1590  						nsize, 0);
1591  			if (err)
1592  				goto out5;
1593  		} else {
1594  			attr->res.data_off = SIZEOF_RESIDENT_LE;
1595  			attr->res.data_size = cpu_to_le32(nsize);
1596  			memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1597  		}
1598  		/* Size of symlink equals the length of input string. */
1599  		inode->i_size = size;
1600  
1601  		attr->size = cpu_to_le32(asize);
1602  
1603  		err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1604  					  &new_de->ref);
1605  		if (err)
1606  			goto out5;
1607  
1608  		rp_inserted = true;
1609  	}
1610  
1611  	attr = Add2Ptr(attr, asize);
1612  	attr->type = ATTR_END;
1613  
1614  	rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1615  	rec->next_attr_id = cpu_to_le16(aid);
1616  
1617  	inode->i_generation = le16_to_cpu(rec->seq);
1618  
1619  	if (S_ISDIR(mode)) {
1620  		inode->i_op = &ntfs_dir_inode_operations;
1621  		inode->i_fop = &ntfs_dir_operations;
1622  	} else if (S_ISLNK(mode)) {
1623  		inode->i_op = &ntfs_link_inode_operations;
1624  		inode->i_fop = NULL;
1625  		inode->i_mapping->a_ops = &ntfs_aops;
1626  		inode->i_size = size;
1627  		inode_nohighmem(inode);
1628  	} else if (S_ISREG(mode)) {
1629  		inode->i_op = &ntfs_file_inode_operations;
1630  		inode->i_fop = &ntfs_file_operations;
1631  		inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1632  							      &ntfs_aops;
1633  		init_rwsem(&ni->file.run_lock);
1634  	} else {
1635  		inode->i_op = &ntfs_special_inode_operations;
1636  		init_special_inode(inode, mode, dev);
1637  	}
1638  
1639  #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1640  	if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1641  		err = ntfs_init_acl(idmap, inode, dir);
1642  		if (err)
1643  			goto out5;
1644  	} else
1645  #endif
1646  	{
1647  		inode->i_flags |= S_NOSEC;
1648  	}
1649  
1650  	/*
1651  	 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1652  	 * The packed size of extended attribute is stored in direntry too.
1653  	 * 'fname' here points to inside new_de.
1654  	 */
1655  	err = ntfs_save_wsl_perm(inode, &fname->dup.ea_size);
1656  	if (err)
1657  		goto out6;
1658  
1659  	/*
1660  	 * update ea_size in file_name attribute too.
1661  	 * Use ni_find_attr cause layout of MFT record may be changed
1662  	 * in ntfs_init_acl and ntfs_save_wsl_perm.
1663  	 */
1664  	attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
1665  	if (attr) {
1666  		struct ATTR_FILE_NAME *fn;
1667  
1668  		fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1669  		if (fn)
1670  			fn->dup.ea_size = fname->dup.ea_size;
1671  	}
1672  
1673  	/* We do not need to update parent directory later */
1674  	ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1675  
1676  	/* Step 2: Add new name in index. */
1677  	err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1678  	if (err)
1679  		goto out6;
1680  
1681  	/*
1682  	 * Call 'd_instantiate' after inode->i_op is set
1683  	 * but before finish_open.
1684  	 */
1685  	d_instantiate(dentry, inode);
1686  
1687  	/* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1688  	inode->i_atime = inode->i_mtime =
1689  		inode_set_ctime_to_ts(inode, ni->i_crtime);
1690  	dir->i_mtime = inode_set_ctime_to_ts(dir, ni->i_crtime);
1691  
1692  	mark_inode_dirty(dir);
1693  	mark_inode_dirty(inode);
1694  
1695  	/* Normal exit. */
1696  	goto out2;
1697  
1698  out6:
1699  	attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL);
1700  	if (attr && attr->non_res) {
1701  		/* Delete ATTR_EA, if non-resident. */
1702  		attr_set_size(ni, ATTR_EA, NULL, 0, NULL, 0, NULL, false, NULL);
1703  	}
1704  
1705  	if (rp_inserted)
1706  		ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1707  
1708  out5:
1709  	if (!S_ISDIR(mode))
1710  		run_deallocate(sbi, &ni->file.run, false);
1711  
1712  out4:
1713  	clear_rec_inuse(rec);
1714  	clear_nlink(inode);
1715  	ni->mi.dirty = false;
1716  	discard_new_inode(inode);
1717  out3:
1718  	ntfs_mark_rec_free(sbi, ino, false);
1719  
1720  out2:
1721  	__putname(new_de);
1722  	kfree(rp);
1723  
1724  out1:
1725  	if (!fnd)
1726  		ni_unlock(dir_ni);
1727  
1728  	if (err)
1729  		return ERR_PTR(err);
1730  
1731  	unlock_new_inode(inode);
1732  
1733  	return inode;
1734  }
1735  
1736  int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1737  {
1738  	int err;
1739  	struct ntfs_inode *ni = ntfs_i(inode);
1740  	struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1741  	struct NTFS_DE *de;
1742  
1743  	/* Allocate PATH_MAX bytes. */
1744  	de = __getname();
1745  	if (!de)
1746  		return -ENOMEM;
1747  
1748  	/* Mark rw ntfs as dirty. It will be cleared at umount. */
1749  	ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1750  
1751  	/* Construct 'de'. */
1752  	err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1753  	if (err)
1754  		goto out;
1755  
1756  	err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1757  out:
1758  	__putname(de);
1759  	return err;
1760  }
1761  
1762  /*
1763   * ntfs_unlink_inode
1764   *
1765   * inode_operations::unlink
1766   * inode_operations::rmdir
1767   */
1768  int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1769  {
1770  	int err;
1771  	struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1772  	struct inode *inode = d_inode(dentry);
1773  	struct ntfs_inode *ni = ntfs_i(inode);
1774  	struct ntfs_inode *dir_ni = ntfs_i(dir);
1775  	struct NTFS_DE *de, *de2 = NULL;
1776  	int undo_remove;
1777  
1778  	if (ntfs_is_meta_file(sbi, ni->mi.rno))
1779  		return -EINVAL;
1780  
1781  	/* Allocate PATH_MAX bytes. */
1782  	de = __getname();
1783  	if (!de)
1784  		return -ENOMEM;
1785  
1786  	ni_lock(ni);
1787  
1788  	if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1789  		err = -ENOTEMPTY;
1790  		goto out;
1791  	}
1792  
1793  	err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1794  	if (err < 0)
1795  		goto out;
1796  
1797  	undo_remove = 0;
1798  	err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1799  
1800  	if (!err) {
1801  		drop_nlink(inode);
1802  		dir->i_mtime = inode_set_ctime_current(dir);
1803  		mark_inode_dirty(dir);
1804  		inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1805  		if (inode->i_nlink)
1806  			mark_inode_dirty(inode);
1807  	} else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1808  		_ntfs_bad_inode(inode);
1809  	} else {
1810  		if (ni_is_dirty(dir))
1811  			mark_inode_dirty(dir);
1812  		if (ni_is_dirty(inode))
1813  			mark_inode_dirty(inode);
1814  	}
1815  
1816  out:
1817  	ni_unlock(ni);
1818  	__putname(de);
1819  	return err;
1820  }
1821  
1822  void ntfs_evict_inode(struct inode *inode)
1823  {
1824  	truncate_inode_pages_final(&inode->i_data);
1825  
1826  	invalidate_inode_buffers(inode);
1827  	clear_inode(inode);
1828  
1829  	ni_clear(ntfs_i(inode));
1830  }
1831  
1832  /*
1833   * ntfs_translate_junction
1834   *
1835   * Translate a Windows junction target to the Linux equivalent.
1836   * On junctions, targets are always absolute (they include the drive
1837   * letter). We have no way of knowing if the target is for the current
1838   * mounted device or not so we just assume it is.
1839   */
1840  static int ntfs_translate_junction(const struct super_block *sb,
1841  				   const struct dentry *link_de, char *target,
1842  				   int target_len, int target_max)
1843  {
1844  	int tl_len, err = target_len;
1845  	char *link_path_buffer = NULL, *link_path;
1846  	char *translated = NULL;
1847  	char *target_start;
1848  	int copy_len;
1849  
1850  	link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1851  	if (!link_path_buffer) {
1852  		err = -ENOMEM;
1853  		goto out;
1854  	}
1855  	/* Get link path, relative to mount point */
1856  	link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1857  	if (IS_ERR(link_path)) {
1858  		ntfs_err(sb, "Error getting link path");
1859  		err = -EINVAL;
1860  		goto out;
1861  	}
1862  
1863  	translated = kmalloc(PATH_MAX, GFP_NOFS);
1864  	if (!translated) {
1865  		err = -ENOMEM;
1866  		goto out;
1867  	}
1868  
1869  	/* Make translated path a relative path to mount point */
1870  	strcpy(translated, "./");
1871  	++link_path; /* Skip leading / */
1872  	for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1873  		if (*link_path == '/') {
1874  			if (PATH_MAX - tl_len < sizeof("../")) {
1875  				ntfs_err(sb,
1876  					 "Link path %s has too many components",
1877  					 link_path);
1878  				err = -EINVAL;
1879  				goto out;
1880  			}
1881  			strcpy(translated + tl_len, "../");
1882  			tl_len += sizeof("../") - 1;
1883  		}
1884  	}
1885  
1886  	/* Skip drive letter */
1887  	target_start = target;
1888  	while (*target_start && *target_start != ':')
1889  		++target_start;
1890  
1891  	if (!*target_start) {
1892  		ntfs_err(sb, "Link target (%s) missing drive separator",
1893  			 target);
1894  		err = -EINVAL;
1895  		goto out;
1896  	}
1897  
1898  	/* Skip drive separator and leading /, if exists */
1899  	target_start += 1 + (target_start[1] == '/');
1900  	copy_len = target_len - (target_start - target);
1901  
1902  	if (PATH_MAX - tl_len <= copy_len) {
1903  		ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1904  			 target_start, PATH_MAX - tl_len, copy_len);
1905  		err = -EINVAL;
1906  		goto out;
1907  	}
1908  
1909  	/* translated path has a trailing / and target_start does not */
1910  	strcpy(translated + tl_len, target_start);
1911  	tl_len += copy_len;
1912  	if (target_max <= tl_len) {
1913  		ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1914  			 translated, target_max, tl_len);
1915  		err = -EINVAL;
1916  		goto out;
1917  	}
1918  	strcpy(target, translated);
1919  	err = tl_len;
1920  
1921  out:
1922  	kfree(link_path_buffer);
1923  	kfree(translated);
1924  	return err;
1925  }
1926  
1927  static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1928  				      struct inode *inode, char *buffer,
1929  				      int buflen)
1930  {
1931  	int i, err = -EINVAL;
1932  	struct ntfs_inode *ni = ntfs_i(inode);
1933  	struct super_block *sb = inode->i_sb;
1934  	struct ntfs_sb_info *sbi = sb->s_fs_info;
1935  	u64 size;
1936  	u16 ulen = 0;
1937  	void *to_free = NULL;
1938  	struct REPARSE_DATA_BUFFER *rp;
1939  	const __le16 *uname;
1940  	struct ATTRIB *attr;
1941  
1942  	/* Reparse data present. Try to parse it. */
1943  	static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1944  	static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1945  
1946  	*buffer = 0;
1947  
1948  	attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1949  	if (!attr)
1950  		goto out;
1951  
1952  	if (!attr->non_res) {
1953  		rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1954  		if (!rp)
1955  			goto out;
1956  		size = le32_to_cpu(attr->res.data_size);
1957  	} else {
1958  		size = le64_to_cpu(attr->nres.data_size);
1959  		rp = NULL;
1960  	}
1961  
1962  	if (size > sbi->reparse.max_size || size <= sizeof(u32))
1963  		goto out;
1964  
1965  	if (!rp) {
1966  		rp = kmalloc(size, GFP_NOFS);
1967  		if (!rp) {
1968  			err = -ENOMEM;
1969  			goto out;
1970  		}
1971  		to_free = rp;
1972  		/* Read into temporal buffer. */
1973  		err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1974  		if (err)
1975  			goto out;
1976  	}
1977  
1978  	/* Microsoft Tag. */
1979  	switch (rp->ReparseTag) {
1980  	case IO_REPARSE_TAG_MOUNT_POINT:
1981  		/* Mount points and junctions. */
1982  		/* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1983  		if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1984  				     MountPointReparseBuffer.PathBuffer))
1985  			goto out;
1986  		uname = Add2Ptr(rp,
1987  				offsetof(struct REPARSE_DATA_BUFFER,
1988  					 MountPointReparseBuffer.PathBuffer) +
1989  					le16_to_cpu(rp->MountPointReparseBuffer
1990  							    .PrintNameOffset));
1991  		ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1992  		break;
1993  
1994  	case IO_REPARSE_TAG_SYMLINK:
1995  		/* FolderSymbolicLink */
1996  		/* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1997  		if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1998  				     SymbolicLinkReparseBuffer.PathBuffer))
1999  			goto out;
2000  		uname = Add2Ptr(
2001  			rp, offsetof(struct REPARSE_DATA_BUFFER,
2002  				     SymbolicLinkReparseBuffer.PathBuffer) +
2003  				    le16_to_cpu(rp->SymbolicLinkReparseBuffer
2004  							.PrintNameOffset));
2005  		ulen = le16_to_cpu(
2006  			rp->SymbolicLinkReparseBuffer.PrintNameLength);
2007  		break;
2008  
2009  	case IO_REPARSE_TAG_CLOUD:
2010  	case IO_REPARSE_TAG_CLOUD_1:
2011  	case IO_REPARSE_TAG_CLOUD_2:
2012  	case IO_REPARSE_TAG_CLOUD_3:
2013  	case IO_REPARSE_TAG_CLOUD_4:
2014  	case IO_REPARSE_TAG_CLOUD_5:
2015  	case IO_REPARSE_TAG_CLOUD_6:
2016  	case IO_REPARSE_TAG_CLOUD_7:
2017  	case IO_REPARSE_TAG_CLOUD_8:
2018  	case IO_REPARSE_TAG_CLOUD_9:
2019  	case IO_REPARSE_TAG_CLOUD_A:
2020  	case IO_REPARSE_TAG_CLOUD_B:
2021  	case IO_REPARSE_TAG_CLOUD_C:
2022  	case IO_REPARSE_TAG_CLOUD_D:
2023  	case IO_REPARSE_TAG_CLOUD_E:
2024  	case IO_REPARSE_TAG_CLOUD_F:
2025  		err = sizeof("OneDrive") - 1;
2026  		if (err > buflen)
2027  			err = buflen;
2028  		memcpy(buffer, "OneDrive", err);
2029  		goto out;
2030  
2031  	default:
2032  		if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2033  			/* Unknown Microsoft Tag. */
2034  			goto out;
2035  		}
2036  		if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2037  		    size <= sizeof(struct REPARSE_POINT)) {
2038  			goto out;
2039  		}
2040  
2041  		/* Users tag. */
2042  		uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2043  		ulen = le16_to_cpu(rp->ReparseDataLength) -
2044  		       sizeof(struct REPARSE_POINT);
2045  	}
2046  
2047  	/* Convert nlen from bytes to UNICODE chars. */
2048  	ulen >>= 1;
2049  
2050  	/* Check that name is available. */
2051  	if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2052  		goto out;
2053  
2054  	/* If name is already zero terminated then truncate it now. */
2055  	if (!uname[ulen - 1])
2056  		ulen -= 1;
2057  
2058  	err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2059  
2060  	if (err < 0)
2061  		goto out;
2062  
2063  	/* Translate Windows '\' into Linux '/'. */
2064  	for (i = 0; i < err; i++) {
2065  		if (buffer[i] == '\\')
2066  			buffer[i] = '/';
2067  	}
2068  
2069  	/* Always set last zero. */
2070  	buffer[err] = 0;
2071  
2072  	/* If this is a junction, translate the link target. */
2073  	if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2074  		err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2075  
2076  out:
2077  	kfree(to_free);
2078  	return err;
2079  }
2080  
2081  static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2082  				 struct delayed_call *done)
2083  {
2084  	int err;
2085  	char *ret;
2086  
2087  	if (!de)
2088  		return ERR_PTR(-ECHILD);
2089  
2090  	ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2091  	if (!ret)
2092  		return ERR_PTR(-ENOMEM);
2093  
2094  	err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2095  	if (err < 0) {
2096  		kfree(ret);
2097  		return ERR_PTR(err);
2098  	}
2099  
2100  	set_delayed_call(done, kfree_link, ret);
2101  
2102  	return ret;
2103  }
2104  
2105  // clang-format off
2106  const struct inode_operations ntfs_link_inode_operations = {
2107  	.get_link	= ntfs_get_link,
2108  	.setattr	= ntfs3_setattr,
2109  	.listxattr	= ntfs_listxattr,
2110  };
2111  
2112  const struct address_space_operations ntfs_aops = {
2113  	.read_folio	= ntfs_read_folio,
2114  	.readahead	= ntfs_readahead,
2115  	.writepages	= ntfs_writepages,
2116  	.write_begin	= ntfs_write_begin,
2117  	.write_end	= ntfs_write_end,
2118  	.direct_IO	= ntfs_direct_IO,
2119  	.bmap		= ntfs_bmap,
2120  	.dirty_folio	= block_dirty_folio,
2121  	.migrate_folio	= buffer_migrate_folio,
2122  	.invalidate_folio = block_invalidate_folio,
2123  };
2124  
2125  const struct address_space_operations ntfs_aops_cmpr = {
2126  	.read_folio	= ntfs_read_folio,
2127  	.readahead	= ntfs_readahead,
2128  	.dirty_folio	= block_dirty_folio,
2129  };
2130  // clang-format on
2131