1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * |
4 | * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. |
5 | * |
6 | */ |
7 | |
8 | #include <linux/buffer_head.h> |
9 | #include <linux/fs.h> |
10 | #include <linux/mpage.h> |
11 | #include <linux/namei.h> |
12 | #include <linux/nls.h> |
13 | #include <linux/uio.h> |
14 | #include <linux/writeback.h> |
15 | |
16 | #include "debug.h" |
17 | #include "ntfs.h" |
18 | #include "ntfs_fs.h" |
19 | |
20 | /* |
21 | * ntfs_read_mft - Read record and parses MFT. |
22 | */ |
23 | static struct inode *ntfs_read_mft(struct inode *inode, |
24 | const struct cpu_str *name, |
25 | const struct MFT_REF *ref) |
26 | { |
27 | int err = 0; |
28 | struct ntfs_inode *ni = ntfs_i(inode); |
29 | struct super_block *sb = inode->i_sb; |
30 | struct ntfs_sb_info *sbi = sb->s_fs_info; |
31 | mode_t mode = 0; |
32 | struct ATTR_STD_INFO5 *std5 = NULL; |
33 | struct ATTR_LIST_ENTRY *le; |
34 | struct ATTRIB *attr; |
35 | bool is_match = false; |
36 | bool is_root = false; |
37 | bool is_dir; |
38 | unsigned long ino = inode->i_ino; |
39 | u32 rp_fa = 0, asize, t32; |
40 | u16 roff, rsize, names = 0; |
41 | const struct ATTR_FILE_NAME *fname = NULL; |
42 | const struct INDEX_ROOT *root; |
43 | struct REPARSE_DATA_BUFFER rp; // 0x18 bytes |
44 | u64 t64; |
45 | struct MFT_REC *rec; |
46 | struct runs_tree *run; |
47 | 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 | fname = Add2Ptr(attr, roff); |
204 | if (fname->type == FILE_NAME_DOS) |
205 | goto next_attr; |
206 | |
207 | names += 1; |
208 | if (name && name->len == fname->name_len && |
209 | !ntfs_cmp_names_cpu(uni1: name, uni2: (struct le_str *)&fname->name_len, |
210 | NULL, bothcase: false)) |
211 | is_match = true; |
212 | |
213 | goto next_attr; |
214 | |
215 | case ATTR_DATA: |
216 | if (is_dir) { |
217 | /* Ignore data attribute in dir record. */ |
218 | goto next_attr; |
219 | } |
220 | |
221 | if (ino == MFT_REC_BADCLUST && !attr->non_res) |
222 | goto next_attr; |
223 | |
224 | if (attr->name_len && |
225 | ((ino != MFT_REC_BADCLUST || !attr->non_res || |
226 | attr->name_len != ARRAY_SIZE(BAD_NAME) || |
227 | memcmp(p: attr_name(attr), q: BAD_NAME, size: sizeof(BAD_NAME))) && |
228 | (ino != MFT_REC_SECURE || !attr->non_res || |
229 | attr->name_len != ARRAY_SIZE(SDS_NAME) || |
230 | memcmp(p: attr_name(attr), q: SDS_NAME, size: sizeof(SDS_NAME))))) { |
231 | /* File contains stream attribute. Ignore it. */ |
232 | goto next_attr; |
233 | } |
234 | |
235 | if (is_attr_sparsed(attr)) |
236 | ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; |
237 | else |
238 | ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; |
239 | |
240 | if (is_attr_compressed(attr)) |
241 | ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; |
242 | else |
243 | ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; |
244 | |
245 | if (is_attr_encrypted(attr)) |
246 | ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; |
247 | else |
248 | ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; |
249 | |
250 | if (!attr->non_res) { |
251 | ni->i_valid = inode->i_size = rsize; |
252 | inode_set_bytes(inode, bytes: rsize); |
253 | } |
254 | |
255 | mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv); |
256 | |
257 | if (!attr->non_res) { |
258 | ni->ni_flags |= NI_FLAG_RESIDENT; |
259 | goto next_attr; |
260 | } |
261 | |
262 | inode_set_bytes(inode, bytes: attr_ondisk_size(attr)); |
263 | |
264 | ni->i_valid = le64_to_cpu(attr->nres.valid_size); |
265 | inode->i_size = le64_to_cpu(attr->nres.data_size); |
266 | if (!attr->nres.alloc_size) |
267 | goto next_attr; |
268 | |
269 | run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run : |
270 | &ni->file.run; |
271 | break; |
272 | |
273 | case ATTR_ROOT: |
274 | if (attr->non_res) |
275 | goto out; |
276 | |
277 | root = Add2Ptr(attr, roff); |
278 | |
279 | if (attr->name_len != ARRAY_SIZE(I30_NAME) || |
280 | memcmp(p: attr_name(attr), q: I30_NAME, size: sizeof(I30_NAME))) |
281 | goto next_attr; |
282 | |
283 | if (root->type != ATTR_NAME || |
284 | root->rule != NTFS_COLLATION_TYPE_FILENAME) |
285 | goto out; |
286 | |
287 | if (!is_dir) |
288 | goto next_attr; |
289 | |
290 | is_root = true; |
291 | ni->ni_flags |= NI_FLAG_DIR; |
292 | |
293 | err = indx_init(indx: &ni->dir, sbi, attr, type: INDEX_MUTEX_I30); |
294 | if (err) |
295 | goto out; |
296 | |
297 | mode = sb->s_root ? |
298 | (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) : |
299 | (S_IFDIR | 0777); |
300 | goto next_attr; |
301 | |
302 | case ATTR_ALLOC: |
303 | if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || |
304 | memcmp(p: attr_name(attr), q: I30_NAME, size: sizeof(I30_NAME))) |
305 | goto next_attr; |
306 | |
307 | inode->i_size = le64_to_cpu(attr->nres.data_size); |
308 | ni->i_valid = le64_to_cpu(attr->nres.valid_size); |
309 | inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); |
310 | |
311 | run = &ni->dir.alloc_run; |
312 | break; |
313 | |
314 | case ATTR_BITMAP: |
315 | if (ino == MFT_REC_MFT) { |
316 | if (!attr->non_res) |
317 | goto out; |
318 | #ifndef CONFIG_NTFS3_64BIT_CLUSTER |
319 | /* 0x20000000 = 2^32 / 8 */ |
320 | if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) |
321 | goto out; |
322 | #endif |
323 | run = &sbi->mft.bitmap.run; |
324 | break; |
325 | } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && |
326 | !memcmp(p: attr_name(attr), q: I30_NAME, |
327 | size: sizeof(I30_NAME)) && |
328 | attr->non_res) { |
329 | run = &ni->dir.bitmap_run; |
330 | break; |
331 | } |
332 | goto next_attr; |
333 | |
334 | case ATTR_REPARSE: |
335 | if (attr->name_len) |
336 | goto next_attr; |
337 | |
338 | rp_fa = ni_parse_reparse(ni, attr, buffer: &rp); |
339 | switch (rp_fa) { |
340 | case REPARSE_LINK: |
341 | /* |
342 | * Normal symlink. |
343 | * Assume one unicode symbol == one utf8. |
344 | */ |
345 | inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer |
346 | .PrintNameLength) / |
347 | sizeof(u16); |
348 | ni->i_valid = inode->i_size; |
349 | /* Clear directory bit. */ |
350 | if (ni->ni_flags & NI_FLAG_DIR) { |
351 | indx_clear(idx: &ni->dir); |
352 | memset(&ni->dir, 0, sizeof(ni->dir)); |
353 | ni->ni_flags &= ~NI_FLAG_DIR; |
354 | } else { |
355 | run_close(run: &ni->file.run); |
356 | } |
357 | mode = S_IFLNK | 0777; |
358 | is_dir = false; |
359 | if (attr->non_res) { |
360 | run = &ni->file.run; |
361 | goto attr_unpack_run; // Double break. |
362 | } |
363 | break; |
364 | |
365 | case REPARSE_COMPRESSED: |
366 | break; |
367 | |
368 | case REPARSE_DEDUPLICATED: |
369 | break; |
370 | } |
371 | goto next_attr; |
372 | |
373 | case ATTR_EA_INFO: |
374 | if (!attr->name_len && |
375 | resident_data_ex(attr, datasize: sizeof(struct EA_INFO))) { |
376 | ni->ni_flags |= NI_FLAG_EA; |
377 | /* |
378 | * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode |
379 | */ |
380 | inode->i_mode = mode; |
381 | ntfs_get_wsl_perm(inode); |
382 | mode = inode->i_mode; |
383 | } |
384 | goto next_attr; |
385 | |
386 | default: |
387 | goto next_attr; |
388 | } |
389 | |
390 | attr_unpack_run: |
391 | roff = le16_to_cpu(attr->nres.run_off); |
392 | |
393 | if (roff > asize) { |
394 | err = -EINVAL; |
395 | goto out; |
396 | } |
397 | |
398 | t64 = le64_to_cpu(attr->nres.svcn); |
399 | |
400 | err = run_unpack_ex(run, sbi, ino, svcn: t64, le64_to_cpu(attr->nres.evcn), |
401 | vcn: t64, Add2Ptr(attr, roff), run_buf_size: asize - roff); |
402 | if (err < 0) |
403 | goto out; |
404 | err = 0; |
405 | goto next_attr; |
406 | |
407 | end_enum: |
408 | |
409 | if (!std5) |
410 | goto out; |
411 | |
412 | if (!is_match && name) { |
413 | err = -ENOENT; |
414 | goto out; |
415 | } |
416 | |
417 | if (std5->fa & FILE_ATTRIBUTE_READONLY) |
418 | mode &= ~0222; |
419 | |
420 | if (!names) { |
421 | err = -EINVAL; |
422 | goto out; |
423 | } |
424 | |
425 | if (names != le16_to_cpu(rec->hard_links)) { |
426 | /* Correct minor error on the fly. Do not mark inode as dirty. */ |
427 | ntfs_inode_warn(inode, "Correct links count -> %u." , names); |
428 | rec->hard_links = cpu_to_le16(names); |
429 | ni->mi.dirty = true; |
430 | } |
431 | |
432 | set_nlink(inode, nlink: names); |
433 | |
434 | if (S_ISDIR(mode)) { |
435 | ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; |
436 | |
437 | /* |
438 | * Dot and dot-dot should be included in count but was not |
439 | * included in enumeration. |
440 | * Usually a hard links to directories are disabled. |
441 | */ |
442 | inode->i_op = &ntfs_dir_inode_operations; |
443 | inode->i_fop = &ntfs_dir_operations; |
444 | ni->i_valid = 0; |
445 | } else if (S_ISLNK(mode)) { |
446 | ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; |
447 | inode->i_op = &ntfs_link_inode_operations; |
448 | inode->i_fop = NULL; |
449 | inode_nohighmem(inode); |
450 | } else if (S_ISREG(mode)) { |
451 | ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; |
452 | inode->i_op = &ntfs_file_inode_operations; |
453 | inode->i_fop = &ntfs_file_operations; |
454 | inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : |
455 | &ntfs_aops; |
456 | if (ino != MFT_REC_MFT) |
457 | init_rwsem(&ni->file.run_lock); |
458 | } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || |
459 | S_ISSOCK(mode)) { |
460 | inode->i_op = &ntfs_special_inode_operations; |
461 | init_special_inode(inode, mode, inode->i_rdev); |
462 | } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && |
463 | fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { |
464 | /* Records in $Extend are not a files or general directories. */ |
465 | inode->i_op = &ntfs_file_inode_operations; |
466 | } else { |
467 | err = -EINVAL; |
468 | goto out; |
469 | } |
470 | |
471 | if ((sbi->options->sys_immutable && |
472 | (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && |
473 | !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { |
474 | inode->i_flags |= S_IMMUTABLE; |
475 | } else { |
476 | inode->i_flags &= ~S_IMMUTABLE; |
477 | } |
478 | |
479 | inode->i_mode = mode; |
480 | if (!(ni->ni_flags & NI_FLAG_EA)) { |
481 | /* If no xattr then no security (stored in xattr). */ |
482 | inode->i_flags |= S_NOSEC; |
483 | } |
484 | |
485 | if (ino == MFT_REC_MFT && !sb->s_root) |
486 | sbi->mft.ni = NULL; |
487 | |
488 | unlock_new_inode(inode); |
489 | |
490 | return inode; |
491 | |
492 | out: |
493 | if (ino == MFT_REC_MFT && !sb->s_root) |
494 | sbi->mft.ni = NULL; |
495 | |
496 | iget_failed(inode); |
497 | return ERR_PTR(error: err); |
498 | } |
499 | |
500 | /* |
501 | * ntfs_test_inode |
502 | * |
503 | * Return: 1 if match. |
504 | */ |
505 | static int ntfs_test_inode(struct inode *inode, void *data) |
506 | { |
507 | struct MFT_REF *ref = data; |
508 | |
509 | return ino_get(ref) == inode->i_ino; |
510 | } |
511 | |
512 | static int ntfs_set_inode(struct inode *inode, void *data) |
513 | { |
514 | const struct MFT_REF *ref = data; |
515 | |
516 | inode->i_ino = ino_get(ref); |
517 | return 0; |
518 | } |
519 | |
520 | struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, |
521 | const struct cpu_str *name) |
522 | { |
523 | struct inode *inode; |
524 | |
525 | inode = iget5_locked(sb, ino_get(ref), test: ntfs_test_inode, set: ntfs_set_inode, |
526 | (void *)ref); |
527 | if (unlikely(!inode)) |
528 | return ERR_PTR(error: -ENOMEM); |
529 | |
530 | /* If this is a freshly allocated inode, need to read it now. */ |
531 | if (inode->i_state & I_NEW) |
532 | inode = ntfs_read_mft(inode, name, ref); |
533 | else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { |
534 | /* Inode overlaps? */ |
535 | _ntfs_bad_inode(inode); |
536 | } |
537 | |
538 | if (IS_ERR(ptr: inode) && name) |
539 | ntfs_set_state(sbi: sb->s_fs_info, dirty: NTFS_DIRTY_ERROR); |
540 | |
541 | return inode; |
542 | } |
543 | |
544 | enum get_block_ctx { |
545 | GET_BLOCK_GENERAL = 0, |
546 | GET_BLOCK_WRITE_BEGIN = 1, |
547 | GET_BLOCK_DIRECT_IO_R = 2, |
548 | GET_BLOCK_DIRECT_IO_W = 3, |
549 | GET_BLOCK_BMAP = 4, |
550 | }; |
551 | |
552 | static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, |
553 | struct buffer_head *bh, int create, |
554 | enum get_block_ctx ctx) |
555 | { |
556 | struct super_block *sb = inode->i_sb; |
557 | struct ntfs_sb_info *sbi = sb->s_fs_info; |
558 | struct ntfs_inode *ni = ntfs_i(inode); |
559 | struct folio *folio = bh->b_folio; |
560 | u8 cluster_bits = sbi->cluster_bits; |
561 | u32 block_size = sb->s_blocksize; |
562 | u64 bytes, lbo, valid; |
563 | u32 off; |
564 | int err; |
565 | CLST vcn, lcn, len; |
566 | bool new; |
567 | |
568 | /* Clear previous state. */ |
569 | clear_buffer_new(bh); |
570 | clear_buffer_uptodate(bh); |
571 | |
572 | if (is_resident(ni)) { |
573 | ni_lock(ni); |
574 | err = attr_data_read_resident(ni, page: &folio->page); |
575 | ni_unlock(ni); |
576 | |
577 | if (!err) |
578 | set_buffer_uptodate(bh); |
579 | bh->b_size = block_size; |
580 | return err; |
581 | } |
582 | |
583 | vcn = vbo >> cluster_bits; |
584 | off = vbo & sbi->cluster_mask; |
585 | new = false; |
586 | |
587 | err = attr_data_get_block(ni, vcn, clen: 1, lcn: &lcn, len: &len, new: create ? &new : NULL, |
588 | zero: create && sbi->cluster_size > PAGE_SIZE); |
589 | if (err) |
590 | goto out; |
591 | |
592 | if (!len) |
593 | return 0; |
594 | |
595 | bytes = ((u64)len << cluster_bits) - off; |
596 | |
597 | if (lcn == SPARSE_LCN) { |
598 | if (!create) { |
599 | if (bh->b_size > bytes) |
600 | bh->b_size = bytes; |
601 | return 0; |
602 | } |
603 | WARN_ON(1); |
604 | } |
605 | |
606 | if (new) |
607 | set_buffer_new(bh); |
608 | |
609 | lbo = ((u64)lcn << cluster_bits) + off; |
610 | |
611 | set_buffer_mapped(bh); |
612 | bh->b_bdev = sb->s_bdev; |
613 | bh->b_blocknr = lbo >> sb->s_blocksize_bits; |
614 | |
615 | valid = ni->i_valid; |
616 | |
617 | if (ctx == GET_BLOCK_DIRECT_IO_W) { |
618 | /* ntfs_direct_IO will update ni->i_valid. */ |
619 | if (vbo >= valid) |
620 | set_buffer_new(bh); |
621 | } else if (create) { |
622 | /* Normal write. */ |
623 | if (bytes > bh->b_size) |
624 | bytes = bh->b_size; |
625 | |
626 | if (vbo >= valid) |
627 | set_buffer_new(bh); |
628 | |
629 | if (vbo + bytes > valid) { |
630 | ni->i_valid = vbo + bytes; |
631 | mark_inode_dirty(inode); |
632 | } |
633 | } else if (vbo >= valid) { |
634 | /* Read out of valid data. */ |
635 | clear_buffer_mapped(bh); |
636 | } else if (vbo + bytes <= valid) { |
637 | /* Normal read. */ |
638 | } else if (vbo + block_size <= valid) { |
639 | /* Normal short read. */ |
640 | bytes = block_size; |
641 | } else { |
642 | /* |
643 | * Read across valid size: vbo < valid && valid < vbo + block_size |
644 | */ |
645 | bytes = block_size; |
646 | |
647 | if (folio) { |
648 | u32 voff = valid - vbo; |
649 | |
650 | bh->b_size = block_size; |
651 | off = vbo & (PAGE_SIZE - 1); |
652 | folio_set_bh(bh, folio, offset: off); |
653 | |
654 | if (bh_read(bh, op_flags: 0) < 0) { |
655 | err = -EIO; |
656 | goto out; |
657 | } |
658 | folio_zero_segment(folio, start: off + voff, xend: off + block_size); |
659 | } |
660 | } |
661 | |
662 | if (bh->b_size > bytes) |
663 | bh->b_size = bytes; |
664 | |
665 | #ifndef __LP64__ |
666 | if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { |
667 | static_assert(sizeof(size_t) < sizeof(loff_t)); |
668 | if (bytes > 0x40000000u) |
669 | bh->b_size = 0x40000000u; |
670 | } |
671 | #endif |
672 | |
673 | return 0; |
674 | |
675 | out: |
676 | return err; |
677 | } |
678 | |
679 | int ntfs_get_block(struct inode *inode, sector_t vbn, |
680 | struct buffer_head *bh_result, int create) |
681 | { |
682 | return ntfs_get_block_vbo(inode, vbo: (u64)vbn << inode->i_blkbits, |
683 | bh: bh_result, create, ctx: GET_BLOCK_GENERAL); |
684 | } |
685 | |
686 | static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, |
687 | struct buffer_head *bh_result, int create) |
688 | { |
689 | return ntfs_get_block_vbo(inode, |
690 | vbo: (u64)vsn << inode->i_sb->s_blocksize_bits, |
691 | bh: bh_result, create, ctx: GET_BLOCK_BMAP); |
692 | } |
693 | |
694 | static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) |
695 | { |
696 | return generic_block_bmap(mapping, block, ntfs_get_block_bmap); |
697 | } |
698 | |
699 | static int ntfs_read_folio(struct file *file, struct folio *folio) |
700 | { |
701 | struct page *page = &folio->page; |
702 | int err; |
703 | struct address_space *mapping = page->mapping; |
704 | struct inode *inode = mapping->host; |
705 | struct ntfs_inode *ni = ntfs_i(inode); |
706 | |
707 | if (is_resident(ni)) { |
708 | ni_lock(ni); |
709 | err = attr_data_read_resident(ni, page); |
710 | ni_unlock(ni); |
711 | if (err != E_NTFS_NONRESIDENT) { |
712 | unlock_page(page); |
713 | return err; |
714 | } |
715 | } |
716 | |
717 | if (is_compressed(ni)) { |
718 | ni_lock(ni); |
719 | err = ni_readpage_cmpr(ni, page); |
720 | ni_unlock(ni); |
721 | return err; |
722 | } |
723 | |
724 | /* Normal + sparse files. */ |
725 | return mpage_read_folio(folio, get_block: ntfs_get_block); |
726 | } |
727 | |
728 | static void ntfs_readahead(struct readahead_control *rac) |
729 | { |
730 | struct address_space *mapping = rac->mapping; |
731 | struct inode *inode = mapping->host; |
732 | struct ntfs_inode *ni = ntfs_i(inode); |
733 | u64 valid; |
734 | loff_t pos; |
735 | |
736 | if (is_resident(ni)) { |
737 | /* No readahead for resident. */ |
738 | return; |
739 | } |
740 | |
741 | if (is_compressed(ni)) { |
742 | /* No readahead for compressed. */ |
743 | return; |
744 | } |
745 | |
746 | valid = ni->i_valid; |
747 | pos = readahead_pos(rac); |
748 | |
749 | if (valid < i_size_read(inode) && pos <= valid && |
750 | valid < pos + readahead_length(rac)) { |
751 | /* Range cross 'valid'. Read it page by page. */ |
752 | return; |
753 | } |
754 | |
755 | mpage_readahead(rac, get_block: ntfs_get_block); |
756 | } |
757 | |
758 | static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, |
759 | struct buffer_head *bh_result, int create) |
760 | { |
761 | return ntfs_get_block_vbo(inode, vbo: (u64)iblock << inode->i_blkbits, |
762 | bh: bh_result, create, ctx: GET_BLOCK_DIRECT_IO_R); |
763 | } |
764 | |
765 | static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, |
766 | struct buffer_head *bh_result, int create) |
767 | { |
768 | return ntfs_get_block_vbo(inode, vbo: (u64)iblock << inode->i_blkbits, |
769 | bh: bh_result, create, ctx: GET_BLOCK_DIRECT_IO_W); |
770 | } |
771 | |
772 | static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
773 | { |
774 | struct file *file = iocb->ki_filp; |
775 | struct address_space *mapping = file->f_mapping; |
776 | struct inode *inode = mapping->host; |
777 | struct ntfs_inode *ni = ntfs_i(inode); |
778 | loff_t vbo = iocb->ki_pos; |
779 | loff_t end; |
780 | int wr = iov_iter_rw(i: iter) & WRITE; |
781 | size_t iter_count = iov_iter_count(i: iter); |
782 | loff_t valid; |
783 | ssize_t ret; |
784 | |
785 | if (is_resident(ni)) { |
786 | /* Switch to buffered write. */ |
787 | ret = 0; |
788 | goto out; |
789 | } |
790 | |
791 | ret = blockdev_direct_IO(iocb, inode, iter, |
792 | get_block: wr ? ntfs_get_block_direct_IO_W : |
793 | ntfs_get_block_direct_IO_R); |
794 | |
795 | if (ret > 0) |
796 | end = vbo + ret; |
797 | else if (wr && ret == -EIOCBQUEUED) |
798 | end = vbo + iter_count; |
799 | else |
800 | goto out; |
801 | |
802 | valid = ni->i_valid; |
803 | if (wr) { |
804 | if (end > valid && !S_ISBLK(inode->i_mode)) { |
805 | ni->i_valid = end; |
806 | mark_inode_dirty(inode); |
807 | } |
808 | } else if (vbo < valid && valid < end) { |
809 | /* Fix page. */ |
810 | iov_iter_revert(i: iter, bytes: end - valid); |
811 | iov_iter_zero(bytes: end - valid, iter); |
812 | } |
813 | |
814 | out: |
815 | return ret; |
816 | } |
817 | |
818 | int ntfs_set_size(struct inode *inode, u64 new_size) |
819 | { |
820 | struct super_block *sb = inode->i_sb; |
821 | struct ntfs_sb_info *sbi = sb->s_fs_info; |
822 | struct ntfs_inode *ni = ntfs_i(inode); |
823 | int err; |
824 | |
825 | /* Check for maximum file size. */ |
826 | if (is_sparsed(ni) || is_compressed(ni)) { |
827 | if (new_size > sbi->maxbytes_sparse) { |
828 | err = -EFBIG; |
829 | goto out; |
830 | } |
831 | } else if (new_size > sbi->maxbytes) { |
832 | err = -EFBIG; |
833 | goto out; |
834 | } |
835 | |
836 | ni_lock(ni); |
837 | down_write(sem: &ni->file.run_lock); |
838 | |
839 | err = attr_set_size(ni, type: ATTR_DATA, NULL, name_len: 0, run: &ni->file.run, new_size, |
840 | new_valid: &ni->i_valid, keep_prealloc: true, NULL); |
841 | |
842 | up_write(sem: &ni->file.run_lock); |
843 | ni_unlock(ni); |
844 | |
845 | mark_inode_dirty(inode); |
846 | |
847 | out: |
848 | return err; |
849 | } |
850 | |
851 | static int ntfs_resident_writepage(struct folio *folio, |
852 | struct writeback_control *wbc, void *data) |
853 | { |
854 | struct address_space *mapping = data; |
855 | struct inode *inode = mapping->host; |
856 | struct ntfs_inode *ni = ntfs_i(inode); |
857 | int ret; |
858 | |
859 | if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) |
860 | return -EIO; |
861 | |
862 | ni_lock(ni); |
863 | ret = attr_data_write_resident(ni, page: &folio->page); |
864 | ni_unlock(ni); |
865 | |
866 | if (ret != E_NTFS_NONRESIDENT) |
867 | folio_unlock(folio); |
868 | mapping_set_error(mapping, error: ret); |
869 | return ret; |
870 | } |
871 | |
872 | static int ntfs_writepages(struct address_space *mapping, |
873 | struct writeback_control *wbc) |
874 | { |
875 | struct inode *inode = mapping->host; |
876 | |
877 | if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) |
878 | return -EIO; |
879 | |
880 | if (is_resident(ni: ntfs_i(inode))) |
881 | return write_cache_pages(mapping, wbc, writepage: ntfs_resident_writepage, |
882 | data: mapping); |
883 | return mpage_writepages(mapping, wbc, get_block: ntfs_get_block); |
884 | } |
885 | |
886 | static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, |
887 | struct buffer_head *bh_result, int create) |
888 | { |
889 | return ntfs_get_block_vbo(inode, vbo: (u64)vbn << inode->i_blkbits, |
890 | bh: bh_result, create, ctx: GET_BLOCK_WRITE_BEGIN); |
891 | } |
892 | |
893 | int ntfs_write_begin(struct file *file, struct address_space *mapping, |
894 | loff_t pos, u32 len, struct page **pagep, void **fsdata) |
895 | { |
896 | int err; |
897 | struct inode *inode = mapping->host; |
898 | struct ntfs_inode *ni = ntfs_i(inode); |
899 | |
900 | if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) |
901 | return -EIO; |
902 | |
903 | *pagep = NULL; |
904 | if (is_resident(ni)) { |
905 | struct page *page = |
906 | grab_cache_page_write_begin(mapping, index: pos >> PAGE_SHIFT); |
907 | |
908 | if (!page) { |
909 | err = -ENOMEM; |
910 | goto out; |
911 | } |
912 | |
913 | ni_lock(ni); |
914 | err = attr_data_read_resident(ni, page); |
915 | ni_unlock(ni); |
916 | |
917 | if (!err) { |
918 | *pagep = page; |
919 | goto out; |
920 | } |
921 | unlock_page(page); |
922 | put_page(page); |
923 | |
924 | if (err != E_NTFS_NONRESIDENT) |
925 | goto out; |
926 | } |
927 | |
928 | err = block_write_begin(mapping, pos, len, pagep, |
929 | get_block: ntfs_get_block_write_begin); |
930 | |
931 | out: |
932 | return err; |
933 | } |
934 | |
935 | /* |
936 | * ntfs_write_end - Address_space_operations::write_end. |
937 | */ |
938 | int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, |
939 | u32 len, u32 copied, struct page *page, void *fsdata) |
940 | { |
941 | struct inode *inode = mapping->host; |
942 | struct ntfs_inode *ni = ntfs_i(inode); |
943 | u64 valid = ni->i_valid; |
944 | bool dirty = false; |
945 | int err; |
946 | |
947 | if (is_resident(ni)) { |
948 | ni_lock(ni); |
949 | err = attr_data_write_resident(ni, page); |
950 | ni_unlock(ni); |
951 | if (!err) { |
952 | dirty = true; |
953 | /* Clear any buffers in page. */ |
954 | if (page_has_buffers(page)) { |
955 | struct buffer_head *head, *bh; |
956 | |
957 | bh = head = page_buffers(page); |
958 | do { |
959 | clear_buffer_dirty(bh); |
960 | clear_buffer_mapped(bh); |
961 | set_buffer_uptodate(bh); |
962 | } while (head != (bh = bh->b_this_page)); |
963 | } |
964 | SetPageUptodate(page); |
965 | err = copied; |
966 | } |
967 | unlock_page(page); |
968 | put_page(page); |
969 | } else { |
970 | err = generic_write_end(file, mapping, pos, len, copied, page, |
971 | fsdata); |
972 | } |
973 | |
974 | if (err >= 0) { |
975 | if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { |
976 | inode_set_mtime_to_ts(inode, |
977 | ts: inode_set_ctime_current(inode)); |
978 | ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; |
979 | dirty = true; |
980 | } |
981 | |
982 | if (valid != ni->i_valid) { |
983 | /* ni->i_valid is changed in ntfs_get_block_vbo. */ |
984 | dirty = true; |
985 | } |
986 | |
987 | if (pos + err > inode->i_size) { |
988 | i_size_write(inode, i_size: pos + err); |
989 | dirty = true; |
990 | } |
991 | |
992 | if (dirty) |
993 | mark_inode_dirty(inode); |
994 | } |
995 | |
996 | return err; |
997 | } |
998 | |
999 | int reset_log_file(struct inode *inode) |
1000 | { |
1001 | int err; |
1002 | loff_t pos = 0; |
1003 | u32 log_size = inode->i_size; |
1004 | struct address_space *mapping = inode->i_mapping; |
1005 | |
1006 | for (;;) { |
1007 | u32 len; |
1008 | void *kaddr; |
1009 | struct page *page; |
1010 | |
1011 | len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; |
1012 | |
1013 | err = block_write_begin(mapping, pos, len, pagep: &page, |
1014 | get_block: ntfs_get_block_write_begin); |
1015 | if (err) |
1016 | goto out; |
1017 | |
1018 | kaddr = kmap_atomic(page); |
1019 | memset(kaddr, -1, len); |
1020 | kunmap_atomic(kaddr); |
1021 | flush_dcache_page(page); |
1022 | |
1023 | err = block_write_end(NULL, mapping, pos, len, len, page, NULL); |
1024 | if (err < 0) |
1025 | goto out; |
1026 | pos += len; |
1027 | |
1028 | if (pos >= log_size) |
1029 | break; |
1030 | balance_dirty_pages_ratelimited(mapping); |
1031 | } |
1032 | out: |
1033 | mark_inode_dirty_sync(inode); |
1034 | |
1035 | return err; |
1036 | } |
1037 | |
1038 | int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) |
1039 | { |
1040 | return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
1041 | } |
1042 | |
1043 | int ntfs_sync_inode(struct inode *inode) |
1044 | { |
1045 | return _ni_write_inode(inode, 1); |
1046 | } |
1047 | |
1048 | /* |
1049 | * writeback_inode - Helper function for ntfs_flush_inodes(). |
1050 | * |
1051 | * This writes both the inode and the file data blocks, waiting |
1052 | * for in flight data blocks before the start of the call. It |
1053 | * does not wait for any io started during the call. |
1054 | */ |
1055 | static int writeback_inode(struct inode *inode) |
1056 | { |
1057 | int ret = sync_inode_metadata(inode, wait: 0); |
1058 | |
1059 | if (!ret) |
1060 | ret = filemap_fdatawrite(inode->i_mapping); |
1061 | return ret; |
1062 | } |
1063 | |
1064 | /* |
1065 | * ntfs_flush_inodes |
1066 | * |
1067 | * Write data and metadata corresponding to i1 and i2. The io is |
1068 | * started but we do not wait for any of it to finish. |
1069 | * |
1070 | * filemap_flush() is used for the block device, so if there is a dirty |
1071 | * page for a block already in flight, we will not wait and start the |
1072 | * io over again. |
1073 | */ |
1074 | int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, |
1075 | struct inode *i2) |
1076 | { |
1077 | int ret = 0; |
1078 | |
1079 | if (i1) |
1080 | ret = writeback_inode(inode: i1); |
1081 | if (!ret && i2) |
1082 | ret = writeback_inode(inode: i2); |
1083 | if (!ret) |
1084 | ret = sync_blockdev_nowait(bdev: sb->s_bdev); |
1085 | return ret; |
1086 | } |
1087 | |
1088 | int inode_write_data(struct inode *inode, const void *data, size_t bytes) |
1089 | { |
1090 | pgoff_t idx; |
1091 | |
1092 | /* Write non resident data. */ |
1093 | for (idx = 0; bytes; idx++) { |
1094 | size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; |
1095 | struct page *page = ntfs_map_page(mapping: inode->i_mapping, index: idx); |
1096 | |
1097 | if (IS_ERR(ptr: page)) |
1098 | return PTR_ERR(ptr: page); |
1099 | |
1100 | lock_page(page); |
1101 | WARN_ON(!PageUptodate(page)); |
1102 | ClearPageUptodate(page); |
1103 | |
1104 | memcpy(page_address(page), data, op); |
1105 | |
1106 | flush_dcache_page(page); |
1107 | SetPageUptodate(page); |
1108 | unlock_page(page); |
1109 | |
1110 | ntfs_unmap_page(page); |
1111 | |
1112 | bytes -= op; |
1113 | data = Add2Ptr(data, PAGE_SIZE); |
1114 | } |
1115 | return 0; |
1116 | } |
1117 | |
1118 | /* |
1119 | * ntfs_reparse_bytes |
1120 | * |
1121 | * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) |
1122 | * for unicode string of @uni_len length. |
1123 | */ |
1124 | static inline u32 ntfs_reparse_bytes(u32 uni_len) |
1125 | { |
1126 | /* Header + unicode string + decorated unicode string. */ |
1127 | return sizeof(short) * (2 * uni_len + 4) + |
1128 | offsetof(struct REPARSE_DATA_BUFFER, |
1129 | SymbolicLinkReparseBuffer.PathBuffer); |
1130 | } |
1131 | |
1132 | static struct REPARSE_DATA_BUFFER * |
1133 | ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, |
1134 | u32 size, u16 *nsize) |
1135 | { |
1136 | int i, err; |
1137 | struct REPARSE_DATA_BUFFER *rp; |
1138 | __le16 *rp_name; |
1139 | typeof(rp->SymbolicLinkReparseBuffer) *rs; |
1140 | |
1141 | rp = kzalloc(size: ntfs_reparse_bytes(uni_len: 2 * size + 2), GFP_NOFS); |
1142 | if (!rp) |
1143 | return ERR_PTR(error: -ENOMEM); |
1144 | |
1145 | rs = &rp->SymbolicLinkReparseBuffer; |
1146 | rp_name = rs->PathBuffer; |
1147 | |
1148 | /* Convert link name to UTF-16. */ |
1149 | err = ntfs_nls_to_utf16(sbi, name: symname, name_len: size, |
1150 | uni: (struct cpu_str *)(rp_name - 1), max_ulen: 2 * size, |
1151 | endian: UTF16_LITTLE_ENDIAN); |
1152 | if (err < 0) |
1153 | goto out; |
1154 | |
1155 | /* err = the length of unicode name of symlink. */ |
1156 | *nsize = ntfs_reparse_bytes(uni_len: err); |
1157 | |
1158 | if (*nsize > sbi->reparse.max_size) { |
1159 | err = -EFBIG; |
1160 | goto out; |
1161 | } |
1162 | |
1163 | /* Translate Linux '/' into Windows '\'. */ |
1164 | for (i = 0; i < err; i++) { |
1165 | if (rp_name[i] == cpu_to_le16('/')) |
1166 | rp_name[i] = cpu_to_le16('\\'); |
1167 | } |
1168 | |
1169 | rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; |
1170 | rp->ReparseDataLength = |
1171 | cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, |
1172 | SymbolicLinkReparseBuffer)); |
1173 | |
1174 | /* PrintName + SubstituteName. */ |
1175 | rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); |
1176 | rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); |
1177 | rs->PrintNameLength = rs->SubstituteNameOffset; |
1178 | |
1179 | /* |
1180 | * TODO: Use relative path if possible to allow Windows to |
1181 | * parse this path. |
1182 | * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). |
1183 | */ |
1184 | rs->Flags = 0; |
1185 | |
1186 | memmove(rp_name + err + 4, rp_name, sizeof(short) * err); |
1187 | |
1188 | /* Decorate SubstituteName. */ |
1189 | rp_name += err; |
1190 | rp_name[0] = cpu_to_le16('\\'); |
1191 | rp_name[1] = cpu_to_le16('?'); |
1192 | rp_name[2] = cpu_to_le16('?'); |
1193 | rp_name[3] = cpu_to_le16('\\'); |
1194 | |
1195 | return rp; |
1196 | out: |
1197 | kfree(objp: rp); |
1198 | return ERR_PTR(error: err); |
1199 | } |
1200 | |
1201 | /* |
1202 | * ntfs_create_inode |
1203 | * |
1204 | * Helper function for: |
1205 | * - ntfs_create |
1206 | * - ntfs_mknod |
1207 | * - ntfs_symlink |
1208 | * - ntfs_mkdir |
1209 | * - ntfs_atomic_open |
1210 | * |
1211 | * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked |
1212 | */ |
1213 | struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir, |
1214 | struct dentry *dentry, |
1215 | const struct cpu_str *uni, umode_t mode, |
1216 | dev_t dev, const char *symname, u32 size, |
1217 | struct ntfs_fnd *fnd) |
1218 | { |
1219 | int err; |
1220 | struct super_block *sb = dir->i_sb; |
1221 | struct ntfs_sb_info *sbi = sb->s_fs_info; |
1222 | const struct qstr *name = &dentry->d_name; |
1223 | CLST ino = 0; |
1224 | struct ntfs_inode *dir_ni = ntfs_i(inode: dir); |
1225 | struct ntfs_inode *ni = NULL; |
1226 | struct inode *inode = NULL; |
1227 | struct ATTRIB *attr; |
1228 | struct ATTR_STD_INFO5 *std5; |
1229 | struct ATTR_FILE_NAME *fname; |
1230 | struct MFT_REC *rec; |
1231 | u32 asize, dsize, sd_size; |
1232 | enum FILE_ATTRIBUTE fa; |
1233 | __le32 security_id = SECURITY_ID_INVALID; |
1234 | CLST vcn; |
1235 | const void *sd; |
1236 | u16 t16, nsize = 0, aid = 0; |
1237 | struct INDEX_ROOT *root, *dir_root; |
1238 | struct NTFS_DE *e, *new_de = NULL; |
1239 | struct REPARSE_DATA_BUFFER *rp = NULL; |
1240 | bool rp_inserted = false; |
1241 | |
1242 | if (!fnd) |
1243 | ni_lock_dir(ni: dir_ni); |
1244 | |
1245 | dir_root = indx_get_root(indx: &dir_ni->dir, ni: dir_ni, NULL, NULL); |
1246 | if (!dir_root) { |
1247 | err = -EINVAL; |
1248 | goto out1; |
1249 | } |
1250 | |
1251 | if (S_ISDIR(mode)) { |
1252 | /* Use parent's directory attributes. */ |
1253 | fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | |
1254 | FILE_ATTRIBUTE_ARCHIVE; |
1255 | /* |
1256 | * By default child directory inherits parent attributes. |
1257 | * Root directory is hidden + system. |
1258 | * Make an exception for children in root. |
1259 | */ |
1260 | if (dir->i_ino == MFT_REC_ROOT) |
1261 | fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); |
1262 | } else if (S_ISLNK(mode)) { |
1263 | /* It is good idea that link should be the same type (file/dir) as target */ |
1264 | fa = FILE_ATTRIBUTE_REPARSE_POINT; |
1265 | |
1266 | /* |
1267 | * Linux: there are dir/file/symlink and so on. |
1268 | * NTFS: symlinks are "dir + reparse" or "file + reparse" |
1269 | * It is good idea to create: |
1270 | * dir + reparse if 'symname' points to directory |
1271 | * or |
1272 | * file + reparse if 'symname' points to file |
1273 | * Unfortunately kern_path hangs if symname contains 'dir'. |
1274 | */ |
1275 | |
1276 | /* |
1277 | * struct path path; |
1278 | * |
1279 | * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ |
1280 | * struct inode *target = d_inode(path.dentry); |
1281 | * |
1282 | * if (S_ISDIR(target->i_mode)) |
1283 | * fa |= FILE_ATTRIBUTE_DIRECTORY; |
1284 | * // if ( target->i_sb == sb ){ |
1285 | * // use relative path? |
1286 | * // } |
1287 | * path_put(&path); |
1288 | * } |
1289 | */ |
1290 | } else if (S_ISREG(mode)) { |
1291 | if (sbi->options->sparse) { |
1292 | /* Sparsed regular file, cause option 'sparse'. */ |
1293 | fa = FILE_ATTRIBUTE_SPARSE_FILE | |
1294 | FILE_ATTRIBUTE_ARCHIVE; |
1295 | } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { |
1296 | /* Compressed regular file, if parent is compressed. */ |
1297 | fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; |
1298 | } else { |
1299 | /* Regular file, default attributes. */ |
1300 | fa = FILE_ATTRIBUTE_ARCHIVE; |
1301 | } |
1302 | } else { |
1303 | fa = FILE_ATTRIBUTE_ARCHIVE; |
1304 | } |
1305 | |
1306 | /* If option "hide_dot_files" then set hidden attribute for dot files. */ |
1307 | if (sbi->options->hide_dot_files && name->name[0] == '.') |
1308 | fa |= FILE_ATTRIBUTE_HIDDEN; |
1309 | |
1310 | if (!(mode & 0222)) |
1311 | fa |= FILE_ATTRIBUTE_READONLY; |
1312 | |
1313 | /* Allocate PATH_MAX bytes. */ |
1314 | new_de = __getname(); |
1315 | if (!new_de) { |
1316 | err = -ENOMEM; |
1317 | goto out1; |
1318 | } |
1319 | |
1320 | if (unlikely(ntfs3_forced_shutdown(sb))) { |
1321 | err = -EIO; |
1322 | goto out2; |
1323 | } |
1324 | |
1325 | /* Mark rw ntfs as dirty. it will be cleared at umount. */ |
1326 | ntfs_set_state(sbi, dirty: NTFS_DIRTY_DIRTY); |
1327 | |
1328 | /* Step 1: allocate and fill new mft record. */ |
1329 | err = ntfs_look_free_mft(sbi, rno: &ino, mft: false, NULL, NULL); |
1330 | if (err) |
1331 | goto out2; |
1332 | |
1333 | ni = ntfs_new_inode(sbi, nRec: ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0); |
1334 | if (IS_ERR(ptr: ni)) { |
1335 | err = PTR_ERR(ptr: ni); |
1336 | ni = NULL; |
1337 | goto out3; |
1338 | } |
1339 | inode = &ni->vfs_inode; |
1340 | inode_init_owner(idmap, inode, dir, mode); |
1341 | mode = inode->i_mode; |
1342 | |
1343 | ni->i_crtime = current_time(inode); |
1344 | |
1345 | rec = ni->mi.mrec; |
1346 | rec->hard_links = cpu_to_le16(1); |
1347 | attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); |
1348 | |
1349 | /* Get default security id. */ |
1350 | sd = s_default_security; |
1351 | sd_size = sizeof(s_default_security); |
1352 | |
1353 | if (is_ntfs3(sbi)) { |
1354 | security_id = dir_ni->std_security_id; |
1355 | if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { |
1356 | security_id = sbi->security.def_security_id; |
1357 | |
1358 | if (security_id == SECURITY_ID_INVALID && |
1359 | !ntfs_insert_security(sbi, sd, size: sd_size, |
1360 | security_id: &security_id, NULL)) |
1361 | sbi->security.def_security_id = security_id; |
1362 | } |
1363 | } |
1364 | |
1365 | /* Insert standard info. */ |
1366 | std5 = Add2Ptr(attr, SIZEOF_RESIDENT); |
1367 | |
1368 | if (security_id == SECURITY_ID_INVALID) { |
1369 | dsize = sizeof(struct ATTR_STD_INFO); |
1370 | } else { |
1371 | dsize = sizeof(struct ATTR_STD_INFO5); |
1372 | std5->security_id = security_id; |
1373 | ni->std_security_id = security_id; |
1374 | } |
1375 | asize = SIZEOF_RESIDENT + dsize; |
1376 | |
1377 | attr->type = ATTR_STD; |
1378 | attr->size = cpu_to_le32(asize); |
1379 | attr->id = cpu_to_le16(aid++); |
1380 | attr->res.data_off = SIZEOF_RESIDENT_LE; |
1381 | attr->res.data_size = cpu_to_le32(dsize); |
1382 | |
1383 | std5->cr_time = std5->m_time = std5->c_time = std5->a_time = |
1384 | kernel2nt(ts: &ni->i_crtime); |
1385 | |
1386 | std5->fa = ni->std_fa = fa; |
1387 | |
1388 | attr = Add2Ptr(attr, asize); |
1389 | |
1390 | /* Insert file name. */ |
1391 | err = fill_name_de(sbi, buf: new_de, name, uni); |
1392 | if (err) |
1393 | goto out4; |
1394 | |
1395 | mi_get_ref(mi: &ni->mi, ref: &new_de->ref); |
1396 | |
1397 | fname = (struct ATTR_FILE_NAME *)(new_de + 1); |
1398 | |
1399 | if (sbi->options->windows_names && |
1400 | !valid_windows_name(sbi, name: (struct le_str *)&fname->name_len)) { |
1401 | err = -EINVAL; |
1402 | goto out4; |
1403 | } |
1404 | |
1405 | mi_get_ref(mi: &dir_ni->mi, ref: &fname->home); |
1406 | fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = |
1407 | fname->dup.a_time = std5->cr_time; |
1408 | fname->dup.alloc_size = fname->dup.data_size = 0; |
1409 | fname->dup.fa = std5->fa; |
1410 | fname->dup.ea_size = fname->dup.reparse = 0; |
1411 | |
1412 | dsize = le16_to_cpu(new_de->key_size); |
1413 | asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); |
1414 | |
1415 | attr->type = ATTR_NAME; |
1416 | attr->size = cpu_to_le32(asize); |
1417 | attr->res.data_off = SIZEOF_RESIDENT_LE; |
1418 | attr->res.flags = RESIDENT_FLAG_INDEXED; |
1419 | attr->id = cpu_to_le16(aid++); |
1420 | attr->res.data_size = cpu_to_le32(dsize); |
1421 | memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); |
1422 | |
1423 | attr = Add2Ptr(attr, asize); |
1424 | |
1425 | if (security_id == SECURITY_ID_INVALID) { |
1426 | /* Insert security attribute. */ |
1427 | asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); |
1428 | |
1429 | attr->type = ATTR_SECURE; |
1430 | attr->size = cpu_to_le32(asize); |
1431 | attr->id = cpu_to_le16(aid++); |
1432 | attr->res.data_off = SIZEOF_RESIDENT_LE; |
1433 | attr->res.data_size = cpu_to_le32(sd_size); |
1434 | memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); |
1435 | |
1436 | attr = Add2Ptr(attr, asize); |
1437 | } |
1438 | |
1439 | attr->id = cpu_to_le16(aid++); |
1440 | if (fa & FILE_ATTRIBUTE_DIRECTORY) { |
1441 | /* |
1442 | * Regular directory or symlink to directory. |
1443 | * Create root attribute. |
1444 | */ |
1445 | dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); |
1446 | asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; |
1447 | |
1448 | attr->type = ATTR_ROOT; |
1449 | attr->size = cpu_to_le32(asize); |
1450 | |
1451 | attr->name_len = ARRAY_SIZE(I30_NAME); |
1452 | attr->name_off = SIZEOF_RESIDENT_LE; |
1453 | attr->res.data_off = |
1454 | cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); |
1455 | attr->res.data_size = cpu_to_le32(dsize); |
1456 | memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, |
1457 | sizeof(I30_NAME)); |
1458 | |
1459 | root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); |
1460 | memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); |
1461 | root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR)); |
1462 | root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + |
1463 | sizeof(struct NTFS_DE)); |
1464 | root->ihdr.total = root->ihdr.used; |
1465 | |
1466 | e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); |
1467 | e->size = cpu_to_le16(sizeof(struct NTFS_DE)); |
1468 | e->flags = NTFS_IE_LAST; |
1469 | } else if (S_ISLNK(mode)) { |
1470 | /* |
1471 | * Symlink to file. |
1472 | * Create empty resident data attribute. |
1473 | */ |
1474 | asize = SIZEOF_RESIDENT; |
1475 | |
1476 | /* Insert empty ATTR_DATA */ |
1477 | attr->type = ATTR_DATA; |
1478 | attr->size = cpu_to_le32(SIZEOF_RESIDENT); |
1479 | attr->name_off = SIZEOF_RESIDENT_LE; |
1480 | attr->res.data_off = SIZEOF_RESIDENT_LE; |
1481 | } else if (S_ISREG(mode)) { |
1482 | /* |
1483 | * Regular file. Create empty non resident data attribute. |
1484 | */ |
1485 | attr->type = ATTR_DATA; |
1486 | attr->non_res = 1; |
1487 | attr->nres.evcn = cpu_to_le64(-1ll); |
1488 | if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { |
1489 | attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); |
1490 | attr->name_off = SIZEOF_NONRESIDENT_EX_LE; |
1491 | attr->flags = ATTR_FLAG_SPARSED; |
1492 | asize = SIZEOF_NONRESIDENT_EX + 8; |
1493 | } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { |
1494 | attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); |
1495 | attr->name_off = SIZEOF_NONRESIDENT_EX_LE; |
1496 | attr->flags = ATTR_FLAG_COMPRESSED; |
1497 | attr->nres.c_unit = COMPRESSION_UNIT; |
1498 | asize = SIZEOF_NONRESIDENT_EX + 8; |
1499 | } else { |
1500 | attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); |
1501 | attr->name_off = SIZEOF_NONRESIDENT_LE; |
1502 | asize = SIZEOF_NONRESIDENT + 8; |
1503 | } |
1504 | attr->nres.run_off = attr->name_off; |
1505 | } else { |
1506 | /* |
1507 | * Node. Create empty resident data attribute. |
1508 | */ |
1509 | attr->type = ATTR_DATA; |
1510 | attr->size = cpu_to_le32(SIZEOF_RESIDENT); |
1511 | attr->name_off = SIZEOF_RESIDENT_LE; |
1512 | if (fa & FILE_ATTRIBUTE_SPARSE_FILE) |
1513 | attr->flags = ATTR_FLAG_SPARSED; |
1514 | else if (fa & FILE_ATTRIBUTE_COMPRESSED) |
1515 | attr->flags = ATTR_FLAG_COMPRESSED; |
1516 | attr->res.data_off = SIZEOF_RESIDENT_LE; |
1517 | asize = SIZEOF_RESIDENT; |
1518 | ni->ni_flags |= NI_FLAG_RESIDENT; |
1519 | } |
1520 | |
1521 | if (S_ISDIR(mode)) { |
1522 | ni->ni_flags |= NI_FLAG_DIR; |
1523 | err = indx_init(indx: &ni->dir, sbi, attr, type: INDEX_MUTEX_I30); |
1524 | if (err) |
1525 | goto out4; |
1526 | } else if (S_ISLNK(mode)) { |
1527 | rp = ntfs_create_reparse_buffer(sbi, symname, size, nsize: &nsize); |
1528 | |
1529 | if (IS_ERR(ptr: rp)) { |
1530 | err = PTR_ERR(ptr: rp); |
1531 | rp = NULL; |
1532 | goto out4; |
1533 | } |
1534 | |
1535 | /* |
1536 | * Insert ATTR_REPARSE. |
1537 | */ |
1538 | attr = Add2Ptr(attr, asize); |
1539 | attr->type = ATTR_REPARSE; |
1540 | attr->id = cpu_to_le16(aid++); |
1541 | |
1542 | /* Resident or non resident? */ |
1543 | asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); |
1544 | t16 = PtrOffset(rec, attr); |
1545 | |
1546 | /* |
1547 | * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. |
1548 | * It is good idea to keep extened attributes resident. |
1549 | */ |
1550 | if (asize + t16 + 0x78 + 8 > sbi->record_size) { |
1551 | CLST alen; |
1552 | CLST clst = bytes_to_cluster(sbi, size: nsize); |
1553 | |
1554 | /* Bytes per runs. */ |
1555 | t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; |
1556 | |
1557 | attr->non_res = 1; |
1558 | attr->nres.evcn = cpu_to_le64(clst - 1); |
1559 | attr->name_off = SIZEOF_NONRESIDENT_LE; |
1560 | attr->nres.run_off = attr->name_off; |
1561 | attr->nres.data_size = cpu_to_le64(nsize); |
1562 | attr->nres.valid_size = attr->nres.data_size; |
1563 | attr->nres.alloc_size = |
1564 | cpu_to_le64(ntfs_up_cluster(sbi, nsize)); |
1565 | |
1566 | err = attr_allocate_clusters(sbi, run: &ni->file.run, vcn: 0, lcn: 0, |
1567 | len: clst, NULL, opt: ALLOCATE_DEF, |
1568 | alen: &alen, fr: 0, NULL, NULL); |
1569 | if (err) |
1570 | goto out5; |
1571 | |
1572 | err = run_pack(run: &ni->file.run, svcn: 0, len: clst, |
1573 | Add2Ptr(attr, SIZEOF_NONRESIDENT), run_buf_size: t16, |
1574 | packed_vcns: &vcn); |
1575 | if (err < 0) |
1576 | goto out5; |
1577 | |
1578 | if (vcn != clst) { |
1579 | err = -EINVAL; |
1580 | goto out5; |
1581 | } |
1582 | |
1583 | asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); |
1584 | /* Write non resident data. */ |
1585 | err = ntfs_sb_write_run(sbi, run: &ni->file.run, vbo: 0, buf: rp, |
1586 | bytes: nsize, sync: 0); |
1587 | if (err) |
1588 | goto out5; |
1589 | } else { |
1590 | attr->res.data_off = SIZEOF_RESIDENT_LE; |
1591 | attr->res.data_size = cpu_to_le32(nsize); |
1592 | memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); |
1593 | } |
1594 | /* Size of symlink equals the length of input string. */ |
1595 | inode->i_size = size; |
1596 | |
1597 | attr->size = cpu_to_le32(asize); |
1598 | |
1599 | err = ntfs_insert_reparse(sbi, rtag: IO_REPARSE_TAG_SYMLINK, |
1600 | ref: &new_de->ref); |
1601 | if (err) |
1602 | goto out5; |
1603 | |
1604 | rp_inserted = true; |
1605 | } |
1606 | |
1607 | attr = Add2Ptr(attr, asize); |
1608 | attr->type = ATTR_END; |
1609 | |
1610 | rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); |
1611 | rec->next_attr_id = cpu_to_le16(aid); |
1612 | |
1613 | inode->i_generation = le16_to_cpu(rec->seq); |
1614 | |
1615 | if (S_ISDIR(mode)) { |
1616 | inode->i_op = &ntfs_dir_inode_operations; |
1617 | inode->i_fop = &ntfs_dir_operations; |
1618 | } else if (S_ISLNK(mode)) { |
1619 | inode->i_op = &ntfs_link_inode_operations; |
1620 | inode->i_fop = NULL; |
1621 | inode->i_mapping->a_ops = &ntfs_aops; |
1622 | inode->i_size = size; |
1623 | inode_nohighmem(inode); |
1624 | } else if (S_ISREG(mode)) { |
1625 | inode->i_op = &ntfs_file_inode_operations; |
1626 | inode->i_fop = &ntfs_file_operations; |
1627 | inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : |
1628 | &ntfs_aops; |
1629 | init_rwsem(&ni->file.run_lock); |
1630 | } else { |
1631 | inode->i_op = &ntfs_special_inode_operations; |
1632 | init_special_inode(inode, mode, dev); |
1633 | } |
1634 | |
1635 | #ifdef CONFIG_NTFS3_FS_POSIX_ACL |
1636 | if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { |
1637 | err = ntfs_init_acl(idmap, inode, dir); |
1638 | if (err) |
1639 | goto out5; |
1640 | } else |
1641 | #endif |
1642 | { |
1643 | inode->i_flags |= S_NOSEC; |
1644 | } |
1645 | |
1646 | /* |
1647 | * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute. |
1648 | * The packed size of extended attribute is stored in direntry too. |
1649 | * 'fname' here points to inside new_de. |
1650 | */ |
1651 | ntfs_save_wsl_perm(inode, ea_size: &fname->dup.ea_size); |
1652 | |
1653 | /* |
1654 | * update ea_size in file_name attribute too. |
1655 | * Use ni_find_attr cause layout of MFT record may be changed |
1656 | * in ntfs_init_acl and ntfs_save_wsl_perm. |
1657 | */ |
1658 | attr = ni_find_attr(ni, NULL, NULL, type: ATTR_NAME, NULL, name_len: 0, NULL, NULL); |
1659 | if (attr) { |
1660 | struct ATTR_FILE_NAME *fn; |
1661 | |
1662 | fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); |
1663 | if (fn) |
1664 | fn->dup.ea_size = fname->dup.ea_size; |
1665 | } |
1666 | |
1667 | /* We do not need to update parent directory later */ |
1668 | ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; |
1669 | |
1670 | /* Step 2: Add new name in index. */ |
1671 | err = indx_insert_entry(indx: &dir_ni->dir, ni: dir_ni, new_de, param: sbi, fnd, undo: 0); |
1672 | if (err) |
1673 | goto out6; |
1674 | |
1675 | /* |
1676 | * Call 'd_instantiate' after inode->i_op is set |
1677 | * but before finish_open. |
1678 | */ |
1679 | d_instantiate(dentry, inode); |
1680 | |
1681 | /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */ |
1682 | inode_set_atime_to_ts(inode, ts: ni->i_crtime); |
1683 | inode_set_ctime_to_ts(inode, ts: ni->i_crtime); |
1684 | inode_set_mtime_to_ts(inode, ts: ni->i_crtime); |
1685 | inode_set_mtime_to_ts(inode: dir, ts: ni->i_crtime); |
1686 | inode_set_ctime_to_ts(inode: dir, ts: ni->i_crtime); |
1687 | |
1688 | mark_inode_dirty(inode: dir); |
1689 | mark_inode_dirty(inode); |
1690 | |
1691 | /* Normal exit. */ |
1692 | goto out2; |
1693 | |
1694 | out6: |
1695 | if (rp_inserted) |
1696 | ntfs_remove_reparse(sbi, rtag: IO_REPARSE_TAG_SYMLINK, ref: &new_de->ref); |
1697 | |
1698 | out5: |
1699 | if (!S_ISDIR(mode)) |
1700 | run_deallocate(sbi, run: &ni->file.run, trim: false); |
1701 | |
1702 | out4: |
1703 | clear_rec_inuse(rec); |
1704 | clear_nlink(inode); |
1705 | ni->mi.dirty = false; |
1706 | discard_new_inode(inode); |
1707 | out3: |
1708 | ntfs_mark_rec_free(sbi, rno: ino, is_mft: false); |
1709 | |
1710 | out2: |
1711 | __putname(new_de); |
1712 | kfree(objp: rp); |
1713 | |
1714 | out1: |
1715 | if (!fnd) |
1716 | ni_unlock(ni: dir_ni); |
1717 | |
1718 | if (err) |
1719 | return ERR_PTR(error: err); |
1720 | |
1721 | unlock_new_inode(inode); |
1722 | |
1723 | return inode; |
1724 | } |
1725 | |
1726 | int ntfs_link_inode(struct inode *inode, struct dentry *dentry) |
1727 | { |
1728 | int err; |
1729 | struct ntfs_inode *ni = ntfs_i(inode); |
1730 | struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; |
1731 | struct NTFS_DE *de; |
1732 | |
1733 | /* Allocate PATH_MAX bytes. */ |
1734 | de = __getname(); |
1735 | if (!de) |
1736 | return -ENOMEM; |
1737 | |
1738 | /* Mark rw ntfs as dirty. It will be cleared at umount. */ |
1739 | ntfs_set_state(sbi, dirty: NTFS_DIRTY_DIRTY); |
1740 | |
1741 | /* Construct 'de'. */ |
1742 | err = fill_name_de(sbi, buf: de, name: &dentry->d_name, NULL); |
1743 | if (err) |
1744 | goto out; |
1745 | |
1746 | err = ni_add_name(dir_ni: ntfs_i(inode: d_inode(dentry: dentry->d_parent)), ni, de); |
1747 | out: |
1748 | __putname(de); |
1749 | return err; |
1750 | } |
1751 | |
1752 | /* |
1753 | * ntfs_unlink_inode |
1754 | * |
1755 | * inode_operations::unlink |
1756 | * inode_operations::rmdir |
1757 | */ |
1758 | int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) |
1759 | { |
1760 | int err; |
1761 | struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; |
1762 | struct inode *inode = d_inode(dentry); |
1763 | struct ntfs_inode *ni = ntfs_i(inode); |
1764 | struct ntfs_inode *dir_ni = ntfs_i(inode: dir); |
1765 | struct NTFS_DE *de, *de2 = NULL; |
1766 | int undo_remove; |
1767 | |
1768 | if (ntfs_is_meta_file(sbi, rno: ni->mi.rno)) |
1769 | return -EINVAL; |
1770 | |
1771 | /* Allocate PATH_MAX bytes. */ |
1772 | de = __getname(); |
1773 | if (!de) |
1774 | return -ENOMEM; |
1775 | |
1776 | ni_lock(ni); |
1777 | |
1778 | if (S_ISDIR(inode->i_mode) && !dir_is_empty(dir: inode)) { |
1779 | err = -ENOTEMPTY; |
1780 | goto out; |
1781 | } |
1782 | |
1783 | err = fill_name_de(sbi, buf: de, name: &dentry->d_name, NULL); |
1784 | if (err < 0) |
1785 | goto out; |
1786 | |
1787 | undo_remove = 0; |
1788 | err = ni_remove_name(dir_ni, ni, de, de2: &de2, undo_step: &undo_remove); |
1789 | |
1790 | if (!err) { |
1791 | drop_nlink(inode); |
1792 | inode_set_mtime_to_ts(inode: dir, ts: inode_set_ctime_current(inode: dir)); |
1793 | mark_inode_dirty(inode: dir); |
1794 | inode_set_ctime_to_ts(inode, ts: inode_get_ctime(inode: dir)); |
1795 | if (inode->i_nlink) |
1796 | mark_inode_dirty(inode); |
1797 | } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_step: undo_remove)) { |
1798 | _ntfs_bad_inode(inode); |
1799 | } else { |
1800 | if (ni_is_dirty(inode: dir)) |
1801 | mark_inode_dirty(inode: dir); |
1802 | if (ni_is_dirty(inode)) |
1803 | mark_inode_dirty(inode); |
1804 | } |
1805 | |
1806 | out: |
1807 | ni_unlock(ni); |
1808 | __putname(de); |
1809 | return err; |
1810 | } |
1811 | |
1812 | void ntfs_evict_inode(struct inode *inode) |
1813 | { |
1814 | truncate_inode_pages_final(&inode->i_data); |
1815 | |
1816 | invalidate_inode_buffers(inode); |
1817 | clear_inode(inode); |
1818 | |
1819 | ni_clear(ni: ntfs_i(inode)); |
1820 | } |
1821 | |
1822 | /* |
1823 | * ntfs_translate_junction |
1824 | * |
1825 | * Translate a Windows junction target to the Linux equivalent. |
1826 | * On junctions, targets are always absolute (they include the drive |
1827 | * letter). We have no way of knowing if the target is for the current |
1828 | * mounted device or not so we just assume it is. |
1829 | */ |
1830 | static int ntfs_translate_junction(const struct super_block *sb, |
1831 | const struct dentry *link_de, char *target, |
1832 | int target_len, int target_max) |
1833 | { |
1834 | int tl_len, err = target_len; |
1835 | char *link_path_buffer = NULL, *link_path; |
1836 | char *translated = NULL; |
1837 | char *target_start; |
1838 | int copy_len; |
1839 | |
1840 | link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS); |
1841 | if (!link_path_buffer) { |
1842 | err = -ENOMEM; |
1843 | goto out; |
1844 | } |
1845 | /* Get link path, relative to mount point */ |
1846 | link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX); |
1847 | if (IS_ERR(ptr: link_path)) { |
1848 | ntfs_err(sb, "Error getting link path" ); |
1849 | err = -EINVAL; |
1850 | goto out; |
1851 | } |
1852 | |
1853 | translated = kmalloc(PATH_MAX, GFP_NOFS); |
1854 | if (!translated) { |
1855 | err = -ENOMEM; |
1856 | goto out; |
1857 | } |
1858 | |
1859 | /* Make translated path a relative path to mount point */ |
1860 | strcpy(p: translated, q: "./" ); |
1861 | ++link_path; /* Skip leading / */ |
1862 | for (tl_len = sizeof("./" ) - 1; *link_path; ++link_path) { |
1863 | if (*link_path == '/') { |
1864 | if (PATH_MAX - tl_len < sizeof("../" )) { |
1865 | ntfs_err(sb, |
1866 | "Link path %s has too many components" , |
1867 | link_path); |
1868 | err = -EINVAL; |
1869 | goto out; |
1870 | } |
1871 | strcpy(p: translated + tl_len, q: "../" ); |
1872 | tl_len += sizeof("../" ) - 1; |
1873 | } |
1874 | } |
1875 | |
1876 | /* Skip drive letter */ |
1877 | target_start = target; |
1878 | while (*target_start && *target_start != ':') |
1879 | ++target_start; |
1880 | |
1881 | if (!*target_start) { |
1882 | ntfs_err(sb, "Link target (%s) missing drive separator" , |
1883 | target); |
1884 | err = -EINVAL; |
1885 | goto out; |
1886 | } |
1887 | |
1888 | /* Skip drive separator and leading /, if exists */ |
1889 | target_start += 1 + (target_start[1] == '/'); |
1890 | copy_len = target_len - (target_start - target); |
1891 | |
1892 | if (PATH_MAX - tl_len <= copy_len) { |
1893 | ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)" , |
1894 | target_start, PATH_MAX - tl_len, copy_len); |
1895 | err = -EINVAL; |
1896 | goto out; |
1897 | } |
1898 | |
1899 | /* translated path has a trailing / and target_start does not */ |
1900 | strcpy(p: translated + tl_len, q: target_start); |
1901 | tl_len += copy_len; |
1902 | if (target_max <= tl_len) { |
1903 | ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)" , |
1904 | translated, target_max, tl_len); |
1905 | err = -EINVAL; |
1906 | goto out; |
1907 | } |
1908 | strcpy(p: target, q: translated); |
1909 | err = tl_len; |
1910 | |
1911 | out: |
1912 | kfree(objp: link_path_buffer); |
1913 | kfree(objp: translated); |
1914 | return err; |
1915 | } |
1916 | |
1917 | static noinline int ntfs_readlink_hlp(const struct dentry *link_de, |
1918 | struct inode *inode, char *buffer, |
1919 | int buflen) |
1920 | { |
1921 | int i, err = -EINVAL; |
1922 | struct ntfs_inode *ni = ntfs_i(inode); |
1923 | struct super_block *sb = inode->i_sb; |
1924 | struct ntfs_sb_info *sbi = sb->s_fs_info; |
1925 | u64 size; |
1926 | u16 ulen = 0; |
1927 | void *to_free = NULL; |
1928 | struct REPARSE_DATA_BUFFER *rp; |
1929 | const __le16 *uname; |
1930 | struct ATTRIB *attr; |
1931 | |
1932 | /* Reparse data present. Try to parse it. */ |
1933 | static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); |
1934 | static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); |
1935 | |
1936 | *buffer = 0; |
1937 | |
1938 | attr = ni_find_attr(ni, NULL, NULL, type: ATTR_REPARSE, NULL, name_len: 0, NULL, NULL); |
1939 | if (!attr) |
1940 | goto out; |
1941 | |
1942 | if (!attr->non_res) { |
1943 | rp = resident_data_ex(attr, datasize: sizeof(struct REPARSE_DATA_BUFFER)); |
1944 | if (!rp) |
1945 | goto out; |
1946 | size = le32_to_cpu(attr->res.data_size); |
1947 | } else { |
1948 | size = le64_to_cpu(attr->nres.data_size); |
1949 | rp = NULL; |
1950 | } |
1951 | |
1952 | if (size > sbi->reparse.max_size || size <= sizeof(u32)) |
1953 | goto out; |
1954 | |
1955 | if (!rp) { |
1956 | rp = kmalloc(size, GFP_NOFS); |
1957 | if (!rp) { |
1958 | err = -ENOMEM; |
1959 | goto out; |
1960 | } |
1961 | to_free = rp; |
1962 | /* Read into temporal buffer. */ |
1963 | err = ntfs_read_run_nb(sbi, run: &ni->file.run, vbo: 0, buf: rp, bytes: size, NULL); |
1964 | if (err) |
1965 | goto out; |
1966 | } |
1967 | |
1968 | /* Microsoft Tag. */ |
1969 | switch (rp->ReparseTag) { |
1970 | case IO_REPARSE_TAG_MOUNT_POINT: |
1971 | /* Mount points and junctions. */ |
1972 | /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ |
1973 | if (size <= offsetof(struct REPARSE_DATA_BUFFER, |
1974 | MountPointReparseBuffer.PathBuffer)) |
1975 | goto out; |
1976 | uname = Add2Ptr(rp, |
1977 | offsetof(struct REPARSE_DATA_BUFFER, |
1978 | MountPointReparseBuffer.PathBuffer) + |
1979 | le16_to_cpu(rp->MountPointReparseBuffer |
1980 | .PrintNameOffset)); |
1981 | ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); |
1982 | break; |
1983 | |
1984 | case IO_REPARSE_TAG_SYMLINK: |
1985 | /* FolderSymbolicLink */ |
1986 | /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ |
1987 | if (size <= offsetof(struct REPARSE_DATA_BUFFER, |
1988 | SymbolicLinkReparseBuffer.PathBuffer)) |
1989 | goto out; |
1990 | uname = Add2Ptr( |
1991 | rp, offsetof(struct REPARSE_DATA_BUFFER, |
1992 | SymbolicLinkReparseBuffer.PathBuffer) + |
1993 | le16_to_cpu(rp->SymbolicLinkReparseBuffer |
1994 | .PrintNameOffset)); |
1995 | ulen = le16_to_cpu( |
1996 | rp->SymbolicLinkReparseBuffer.PrintNameLength); |
1997 | break; |
1998 | |
1999 | case IO_REPARSE_TAG_CLOUD: |
2000 | case IO_REPARSE_TAG_CLOUD_1: |
2001 | case IO_REPARSE_TAG_CLOUD_2: |
2002 | case IO_REPARSE_TAG_CLOUD_3: |
2003 | case IO_REPARSE_TAG_CLOUD_4: |
2004 | case IO_REPARSE_TAG_CLOUD_5: |
2005 | case IO_REPARSE_TAG_CLOUD_6: |
2006 | case IO_REPARSE_TAG_CLOUD_7: |
2007 | case IO_REPARSE_TAG_CLOUD_8: |
2008 | case IO_REPARSE_TAG_CLOUD_9: |
2009 | case IO_REPARSE_TAG_CLOUD_A: |
2010 | case IO_REPARSE_TAG_CLOUD_B: |
2011 | case IO_REPARSE_TAG_CLOUD_C: |
2012 | case IO_REPARSE_TAG_CLOUD_D: |
2013 | case IO_REPARSE_TAG_CLOUD_E: |
2014 | case IO_REPARSE_TAG_CLOUD_F: |
2015 | err = sizeof("OneDrive" ) - 1; |
2016 | if (err > buflen) |
2017 | err = buflen; |
2018 | memcpy(buffer, "OneDrive" , err); |
2019 | goto out; |
2020 | |
2021 | default: |
2022 | if (IsReparseTagMicrosoft(rp->ReparseTag)) { |
2023 | /* Unknown Microsoft Tag. */ |
2024 | goto out; |
2025 | } |
2026 | if (!IsReparseTagNameSurrogate(rp->ReparseTag) || |
2027 | size <= sizeof(struct REPARSE_POINT)) { |
2028 | goto out; |
2029 | } |
2030 | |
2031 | /* Users tag. */ |
2032 | uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); |
2033 | ulen = le16_to_cpu(rp->ReparseDataLength) - |
2034 | sizeof(struct REPARSE_POINT); |
2035 | } |
2036 | |
2037 | /* Convert nlen from bytes to UNICODE chars. */ |
2038 | ulen >>= 1; |
2039 | |
2040 | /* Check that name is available. */ |
2041 | if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) |
2042 | goto out; |
2043 | |
2044 | /* If name is already zero terminated then truncate it now. */ |
2045 | if (!uname[ulen - 1]) |
2046 | ulen -= 1; |
2047 | |
2048 | err = ntfs_utf16_to_nls(sbi, name: uname, len: ulen, buf: buffer, buf_len: buflen); |
2049 | |
2050 | if (err < 0) |
2051 | goto out; |
2052 | |
2053 | /* Translate Windows '\' into Linux '/'. */ |
2054 | for (i = 0; i < err; i++) { |
2055 | if (buffer[i] == '\\') |
2056 | buffer[i] = '/'; |
2057 | } |
2058 | |
2059 | /* Always set last zero. */ |
2060 | buffer[err] = 0; |
2061 | |
2062 | /* If this is a junction, translate the link target. */ |
2063 | if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) |
2064 | err = ntfs_translate_junction(sb, link_de, target: buffer, target_len: err, target_max: buflen); |
2065 | |
2066 | out: |
2067 | kfree(objp: to_free); |
2068 | return err; |
2069 | } |
2070 | |
2071 | static const char *ntfs_get_link(struct dentry *de, struct inode *inode, |
2072 | struct delayed_call *done) |
2073 | { |
2074 | int err; |
2075 | char *ret; |
2076 | |
2077 | if (!de) |
2078 | return ERR_PTR(error: -ECHILD); |
2079 | |
2080 | ret = kmalloc(PAGE_SIZE, GFP_NOFS); |
2081 | if (!ret) |
2082 | return ERR_PTR(error: -ENOMEM); |
2083 | |
2084 | err = ntfs_readlink_hlp(link_de: de, inode, buffer: ret, PAGE_SIZE); |
2085 | if (err < 0) { |
2086 | kfree(objp: ret); |
2087 | return ERR_PTR(error: err); |
2088 | } |
2089 | |
2090 | set_delayed_call(call: done, fn: kfree_link, arg: ret); |
2091 | |
2092 | return ret; |
2093 | } |
2094 | |
2095 | // clang-format off |
2096 | const struct inode_operations ntfs_link_inode_operations = { |
2097 | .get_link = ntfs_get_link, |
2098 | .setattr = ntfs3_setattr, |
2099 | .listxattr = ntfs_listxattr, |
2100 | }; |
2101 | |
2102 | const struct address_space_operations ntfs_aops = { |
2103 | .read_folio = ntfs_read_folio, |
2104 | .readahead = ntfs_readahead, |
2105 | .writepages = ntfs_writepages, |
2106 | .write_begin = ntfs_write_begin, |
2107 | .write_end = ntfs_write_end, |
2108 | .direct_IO = ntfs_direct_IO, |
2109 | .bmap = ntfs_bmap, |
2110 | .dirty_folio = block_dirty_folio, |
2111 | .migrate_folio = buffer_migrate_folio, |
2112 | .invalidate_folio = block_invalidate_folio, |
2113 | }; |
2114 | |
2115 | const struct address_space_operations ntfs_aops_cmpr = { |
2116 | .read_folio = ntfs_read_folio, |
2117 | .readahead = ntfs_readahead, |
2118 | }; |
2119 | // clang-format on |
2120 | |