1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/hfsplus/catalog.c
4 *
5 * Copyright (C) 2001
6 * Brad Boyer (flar@allandria.com)
7 * (C) 2003 Ardis Technologies <roman@ardistech.com>
8 *
9 * Handling of catalog records
10 */
11
12
13 #include "hfsplus_fs.h"
14 #include "hfsplus_raw.h"
15
hfsplus_cat_case_cmp_key(const hfsplus_btree_key * k1,const hfsplus_btree_key * k2)16 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
17 const hfsplus_btree_key *k2)
18 {
19 __be32 k1p, k2p;
20
21 k1p = k1->cat.parent;
22 k2p = k2->cat.parent;
23 if (k1p != k2p)
24 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
25
26 return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name);
27 }
28
hfsplus_cat_bin_cmp_key(const hfsplus_btree_key * k1,const hfsplus_btree_key * k2)29 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
30 const hfsplus_btree_key *k2)
31 {
32 __be32 k1p, k2p;
33
34 k1p = k1->cat.parent;
35 k2p = k2->cat.parent;
36 if (k1p != k2p)
37 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
38
39 return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
40 }
41
42 /* Generates key for catalog file/folders record. */
hfsplus_cat_build_key(struct super_block * sb,hfsplus_btree_key * key,u32 parent,const struct qstr * str)43 int hfsplus_cat_build_key(struct super_block *sb,
44 hfsplus_btree_key *key, u32 parent, const struct qstr *str)
45 {
46 int len, err;
47
48 key->cat.parent = cpu_to_be32(parent);
49 err = hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN,
50 str->name, str->len);
51 if (unlikely(err < 0))
52 return err;
53
54 len = be16_to_cpu(key->cat.name.length);
55 key->key_len = cpu_to_be16(6 + 2 * len);
56 return 0;
57 }
58
59 /* Generates key for catalog thread record. */
hfsplus_cat_build_key_with_cnid(struct super_block * sb,hfsplus_btree_key * key,u32 parent)60 void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
61 hfsplus_btree_key *key, u32 parent)
62 {
63 key->cat.parent = cpu_to_be32(parent);
64 key->cat.name.length = 0;
65 key->key_len = cpu_to_be16(6);
66 }
67
hfsplus_cat_build_key_uni(hfsplus_btree_key * key,u32 parent,struct hfsplus_unistr * name)68 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
69 struct hfsplus_unistr *name)
70 {
71 int ustrlen;
72
73 ustrlen = be16_to_cpu(name->length);
74 key->cat.parent = cpu_to_be32(parent);
75 key->cat.name.length = cpu_to_be16(ustrlen);
76 ustrlen *= 2;
77 memcpy(key->cat.name.unicode, name->unicode, ustrlen);
78 key->key_len = cpu_to_be16(6 + ustrlen);
79 }
80
hfsplus_cat_set_perms(struct inode * inode,struct hfsplus_perm * perms)81 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
82 {
83 if (inode->i_flags & S_IMMUTABLE)
84 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
85 else
86 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
87 if (inode->i_flags & S_APPEND)
88 perms->rootflags |= HFSPLUS_FLG_APPEND;
89 else
90 perms->rootflags &= ~HFSPLUS_FLG_APPEND;
91
92 perms->userflags = HFSPLUS_I(inode)->userflags;
93 perms->mode = cpu_to_be16(inode->i_mode);
94 perms->owner = cpu_to_be32(i_uid_read(inode));
95 perms->group = cpu_to_be32(i_gid_read(inode));
96
97 if (S_ISREG(inode->i_mode))
98 perms->dev = cpu_to_be32(inode->i_nlink);
99 else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
100 perms->dev = cpu_to_be32(inode->i_rdev);
101 else
102 perms->dev = 0;
103 }
104
hfsplus_cat_build_record(hfsplus_cat_entry * entry,u32 cnid,struct inode * inode)105 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
106 u32 cnid, struct inode *inode)
107 {
108 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
109
110 if (S_ISDIR(inode->i_mode)) {
111 struct hfsplus_cat_folder *folder;
112
113 folder = &entry->folder;
114 memset(folder, 0, sizeof(*folder));
115 folder->type = cpu_to_be16(HFSPLUS_FOLDER);
116 if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags))
117 folder->flags |= cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT);
118 folder->id = cpu_to_be32(inode->i_ino);
119 HFSPLUS_I(inode)->create_date =
120 folder->create_date =
121 folder->content_mod_date =
122 folder->attribute_mod_date =
123 folder->access_date = hfsp_now2mt();
124 hfsplus_cat_set_perms(inode, &folder->permissions);
125 if (inode == sbi->hidden_dir)
126 /* invisible and namelocked */
127 folder->user_info.frFlags = cpu_to_be16(0x5000);
128 return sizeof(*folder);
129 } else {
130 struct hfsplus_cat_file *file;
131
132 file = &entry->file;
133 memset(file, 0, sizeof(*file));
134 file->type = cpu_to_be16(HFSPLUS_FILE);
135 file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
136 file->id = cpu_to_be32(cnid);
137 HFSPLUS_I(inode)->create_date =
138 file->create_date =
139 file->content_mod_date =
140 file->attribute_mod_date =
141 file->access_date = hfsp_now2mt();
142 if (cnid == inode->i_ino) {
143 hfsplus_cat_set_perms(inode, &file->permissions);
144 if (S_ISLNK(inode->i_mode)) {
145 file->user_info.fdType =
146 cpu_to_be32(HFSP_SYMLINK_TYPE);
147 file->user_info.fdCreator =
148 cpu_to_be32(HFSP_SYMLINK_CREATOR);
149 } else {
150 file->user_info.fdType =
151 cpu_to_be32(sbi->type);
152 file->user_info.fdCreator =
153 cpu_to_be32(sbi->creator);
154 }
155 if (HFSPLUS_FLG_IMMUTABLE &
156 (file->permissions.rootflags |
157 file->permissions.userflags))
158 file->flags |=
159 cpu_to_be16(HFSPLUS_FILE_LOCKED);
160 } else {
161 file->user_info.fdType =
162 cpu_to_be32(HFSP_HARDLINK_TYPE);
163 file->user_info.fdCreator =
164 cpu_to_be32(HFSP_HFSPLUS_CREATOR);
165 file->user_info.fdFlags =
166 cpu_to_be16(0x100);
167 file->create_date =
168 HFSPLUS_I(sbi->hidden_dir)->create_date;
169 file->permissions.dev =
170 cpu_to_be32(HFSPLUS_I(inode)->linkid);
171 }
172 return sizeof(*file);
173 }
174 }
175
hfsplus_fill_cat_thread(struct super_block * sb,hfsplus_cat_entry * entry,int type,u32 parentid,const struct qstr * str)176 static int hfsplus_fill_cat_thread(struct super_block *sb,
177 hfsplus_cat_entry *entry, int type,
178 u32 parentid, const struct qstr *str)
179 {
180 int err;
181
182 entry->type = cpu_to_be16(type);
183 entry->thread.reserved = 0;
184 entry->thread.parentID = cpu_to_be32(parentid);
185 err = hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
186 str->name, str->len);
187 if (unlikely(err < 0))
188 return err;
189
190 return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
191 }
192
193 /* Try to get a catalog entry for given catalog id */
hfsplus_find_cat(struct super_block * sb,u32 cnid,struct hfs_find_data * fd)194 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
195 struct hfs_find_data *fd)
196 {
197 hfsplus_cat_entry tmp;
198 int err;
199 u16 type;
200
201 hfsplus_cat_build_key_with_cnid(sb, fd->search_key, cnid);
202 err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
203 if (err)
204 return err;
205
206 type = be16_to_cpu(tmp.type);
207 if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
208 pr_err("found bad thread record in catalog\n");
209 return -EIO;
210 }
211
212 if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
213 pr_err("catalog name length corrupted\n");
214 return -EIO;
215 }
216
217 hfsplus_cat_build_key_uni(fd->search_key,
218 be32_to_cpu(tmp.thread.parentID),
219 &tmp.thread.nodeName);
220 return hfs_brec_find(fd, hfs_find_rec_by_key);
221 }
222
hfsplus_subfolders_inc(struct inode * dir)223 static void hfsplus_subfolders_inc(struct inode *dir)
224 {
225 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
226
227 if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
228 /*
229 * Increment subfolder count. Note, the value is only meaningful
230 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
231 */
232 HFSPLUS_I(dir)->subfolders++;
233 }
234 }
235
hfsplus_subfolders_dec(struct inode * dir)236 static void hfsplus_subfolders_dec(struct inode *dir)
237 {
238 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
239
240 if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
241 /*
242 * Decrement subfolder count. Note, the value is only meaningful
243 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
244 *
245 * Check for zero. Some subfolders may have been created
246 * by an implementation ignorant of this counter.
247 */
248 if (HFSPLUS_I(dir)->subfolders)
249 HFSPLUS_I(dir)->subfolders--;
250 }
251 }
252
hfsplus_create_cat(u32 cnid,struct inode * dir,const struct qstr * str,struct inode * inode)253 int hfsplus_create_cat(u32 cnid, struct inode *dir,
254 const struct qstr *str, struct inode *inode)
255 {
256 struct super_block *sb = dir->i_sb;
257 struct hfs_find_data fd;
258 hfsplus_cat_entry entry;
259 int entry_size;
260 int err;
261
262 hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
263 str->name, cnid, inode->i_nlink);
264 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
265 if (err)
266 return err;
267
268 /*
269 * Fail early and avoid ENOSPC during the btree operations. We may
270 * have to split the root node at most once.
271 */
272 err = hfs_bmap_reserve(fd.tree, 2 * fd.tree->depth);
273 if (err)
274 goto err2;
275
276 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
277 entry_size = hfsplus_fill_cat_thread(sb, &entry,
278 S_ISDIR(inode->i_mode) ?
279 HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
280 dir->i_ino, str);
281 if (unlikely(entry_size < 0)) {
282 err = entry_size;
283 goto err2;
284 }
285
286 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
287 if (err != -ENOENT) {
288 if (!err)
289 err = -EEXIST;
290 goto err2;
291 }
292 err = hfs_brec_insert(&fd, &entry, entry_size);
293 if (err)
294 goto err2;
295
296 err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
297 if (unlikely(err))
298 goto err1;
299
300 entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
301 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
302 if (err != -ENOENT) {
303 /* panic? */
304 if (!err)
305 err = -EEXIST;
306 goto err1;
307 }
308 err = hfs_brec_insert(&fd, &entry, entry_size);
309 if (err)
310 goto err1;
311
312 dir->i_size++;
313 if (S_ISDIR(inode->i_mode))
314 hfsplus_subfolders_inc(dir);
315 dir->i_mtime = dir->i_ctime = current_time(dir);
316 hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
317
318 hfs_find_exit(&fd);
319 return 0;
320
321 err1:
322 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
323 if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
324 hfs_brec_remove(&fd);
325 err2:
326 hfs_find_exit(&fd);
327 return err;
328 }
329
hfsplus_delete_cat(u32 cnid,struct inode * dir,const struct qstr * str)330 int hfsplus_delete_cat(u32 cnid, struct inode *dir, const struct qstr *str)
331 {
332 struct super_block *sb = dir->i_sb;
333 struct hfs_find_data fd;
334 struct hfsplus_fork_raw fork;
335 struct list_head *pos;
336 int err, off;
337 u16 type;
338
339 hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
340 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
341 if (err)
342 return err;
343
344 /*
345 * Fail early and avoid ENOSPC during the btree operations. We may
346 * have to split the root node at most once.
347 */
348 err = hfs_bmap_reserve(fd.tree, 2 * (int)fd.tree->depth - 2);
349 if (err)
350 goto out;
351
352 if (!str) {
353 int len;
354
355 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
356 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
357 if (err)
358 goto out;
359
360 off = fd.entryoffset +
361 offsetof(struct hfsplus_cat_thread, nodeName);
362 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
363 hfs_bnode_read(fd.bnode,
364 &fd.search_key->cat.name.length, off, 2);
365 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
366 hfs_bnode_read(fd.bnode,
367 &fd.search_key->cat.name.unicode,
368 off + 2, len);
369 fd.search_key->key_len = cpu_to_be16(6 + len);
370 } else {
371 err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
372 if (unlikely(err))
373 goto out;
374 }
375
376 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
377 if (err)
378 goto out;
379
380 type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
381 if (type == HFSPLUS_FILE) {
382 #if 0
383 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
384 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
385 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
386 #endif
387
388 off = fd.entryoffset +
389 offsetof(struct hfsplus_cat_file, rsrc_fork);
390 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
391 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
392 }
393
394 /* we only need to take spinlock for exclusion with ->release() */
395 spin_lock(&HFSPLUS_I(dir)->open_dir_lock);
396 list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
397 struct hfsplus_readdir_data *rd =
398 list_entry(pos, struct hfsplus_readdir_data, list);
399 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
400 rd->file->f_pos--;
401 }
402 spin_unlock(&HFSPLUS_I(dir)->open_dir_lock);
403
404 err = hfs_brec_remove(&fd);
405 if (err)
406 goto out;
407
408 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
409 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
410 if (err)
411 goto out;
412
413 err = hfs_brec_remove(&fd);
414 if (err)
415 goto out;
416
417 dir->i_size--;
418 if (type == HFSPLUS_FOLDER)
419 hfsplus_subfolders_dec(dir);
420 dir->i_mtime = dir->i_ctime = current_time(dir);
421 hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
422
423 if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
424 if (HFSPLUS_SB(sb)->attr_tree)
425 hfsplus_delete_all_attrs(dir, cnid);
426 }
427
428 out:
429 hfs_find_exit(&fd);
430
431 return err;
432 }
433
hfsplus_rename_cat(u32 cnid,struct inode * src_dir,const struct qstr * src_name,struct inode * dst_dir,const struct qstr * dst_name)434 int hfsplus_rename_cat(u32 cnid,
435 struct inode *src_dir, const struct qstr *src_name,
436 struct inode *dst_dir, const struct qstr *dst_name)
437 {
438 struct super_block *sb = src_dir->i_sb;
439 struct hfs_find_data src_fd, dst_fd;
440 hfsplus_cat_entry entry;
441 int entry_size, type;
442 int err;
443
444 hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
445 cnid, src_dir->i_ino, src_name->name,
446 dst_dir->i_ino, dst_name->name);
447 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
448 if (err)
449 return err;
450 dst_fd = src_fd;
451
452 /*
453 * Fail early and avoid ENOSPC during the btree operations. We may
454 * have to split the root node at most twice.
455 */
456 err = hfs_bmap_reserve(src_fd.tree, 4 * (int)src_fd.tree->depth - 1);
457 if (err)
458 goto out;
459
460 /* find the old dir entry and read the data */
461 err = hfsplus_cat_build_key(sb, src_fd.search_key,
462 src_dir->i_ino, src_name);
463 if (unlikely(err))
464 goto out;
465
466 err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
467 if (err)
468 goto out;
469 if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
470 err = -EIO;
471 goto out;
472 }
473
474 hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
475 src_fd.entrylength);
476 type = be16_to_cpu(entry.type);
477
478 /* create new dir entry with the data from the old entry */
479 err = hfsplus_cat_build_key(sb, dst_fd.search_key,
480 dst_dir->i_ino, dst_name);
481 if (unlikely(err))
482 goto out;
483
484 err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
485 if (err != -ENOENT) {
486 if (!err)
487 err = -EEXIST;
488 goto out;
489 }
490
491 err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
492 if (err)
493 goto out;
494 dst_dir->i_size++;
495 if (type == HFSPLUS_FOLDER)
496 hfsplus_subfolders_inc(dst_dir);
497 dst_dir->i_mtime = dst_dir->i_ctime = current_time(dst_dir);
498
499 /* finally remove the old entry */
500 err = hfsplus_cat_build_key(sb, src_fd.search_key,
501 src_dir->i_ino, src_name);
502 if (unlikely(err))
503 goto out;
504
505 err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
506 if (err)
507 goto out;
508 err = hfs_brec_remove(&src_fd);
509 if (err)
510 goto out;
511 src_dir->i_size--;
512 if (type == HFSPLUS_FOLDER)
513 hfsplus_subfolders_dec(src_dir);
514 src_dir->i_mtime = src_dir->i_ctime = current_time(src_dir);
515
516 /* remove old thread entry */
517 hfsplus_cat_build_key_with_cnid(sb, src_fd.search_key, cnid);
518 err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
519 if (err)
520 goto out;
521 type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
522 err = hfs_brec_remove(&src_fd);
523 if (err)
524 goto out;
525
526 /* create new thread entry */
527 hfsplus_cat_build_key_with_cnid(sb, dst_fd.search_key, cnid);
528 entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
529 dst_dir->i_ino, dst_name);
530 if (unlikely(entry_size < 0)) {
531 err = entry_size;
532 goto out;
533 }
534
535 err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
536 if (err != -ENOENT) {
537 if (!err)
538 err = -EEXIST;
539 goto out;
540 }
541 err = hfs_brec_insert(&dst_fd, &entry, entry_size);
542
543 hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
544 hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
545 out:
546 hfs_bnode_put(dst_fd.bnode);
547 hfs_find_exit(&src_fd);
548 return err;
549 }
550