xref: /linux/fs/hfsplus/catalog.c (revision 2bc46b3ad3c15165f91459b07ff8682478683194)
1 /*
2  *  linux/fs/hfsplus/catalog.c
3  *
4  * Copyright (C) 2001
5  * Brad Boyer (flar@allandria.com)
6  * (C) 2003 Ardis Technologies <roman@ardistech.com>
7  *
8  * Handling of catalog records
9  */
10 
11 
12 #include "hfsplus_fs.h"
13 #include "hfsplus_raw.h"
14 
15 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
16 			     const hfsplus_btree_key *k2)
17 {
18 	__be32 k1p, k2p;
19 
20 	k1p = k1->cat.parent;
21 	k2p = k2->cat.parent;
22 	if (k1p != k2p)
23 		return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
24 
25 	return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name);
26 }
27 
28 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
29 			    const hfsplus_btree_key *k2)
30 {
31 	__be32 k1p, k2p;
32 
33 	k1p = k1->cat.parent;
34 	k2p = k2->cat.parent;
35 	if (k1p != k2p)
36 		return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
37 
38 	return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
39 }
40 
41 /* Generates key for catalog file/folders record. */
42 int hfsplus_cat_build_key(struct super_block *sb,
43 		hfsplus_btree_key *key, u32 parent, struct qstr *str)
44 {
45 	int len, err;
46 
47 	key->cat.parent = cpu_to_be32(parent);
48 	err = hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN,
49 			str->name, str->len);
50 	if (unlikely(err < 0))
51 		return err;
52 
53 	len = be16_to_cpu(key->cat.name.length);
54 	key->key_len = cpu_to_be16(6 + 2 * len);
55 	return 0;
56 }
57 
58 /* Generates key for catalog thread record. */
59 void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
60 			hfsplus_btree_key *key, u32 parent)
61 {
62 	key->cat.parent = cpu_to_be32(parent);
63 	key->cat.name.length = 0;
64 	key->key_len = cpu_to_be16(6);
65 }
66 
67 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
68 				      struct hfsplus_unistr *name)
69 {
70 	int ustrlen;
71 
72 	ustrlen = be16_to_cpu(name->length);
73 	key->cat.parent = cpu_to_be32(parent);
74 	key->cat.name.length = cpu_to_be16(ustrlen);
75 	ustrlen *= 2;
76 	memcpy(key->cat.name.unicode, name->unicode, ustrlen);
77 	key->key_len = cpu_to_be16(6 + ustrlen);
78 }
79 
80 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
81 {
82 	if (inode->i_flags & S_IMMUTABLE)
83 		perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
84 	else
85 		perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
86 	if (inode->i_flags & S_APPEND)
87 		perms->rootflags |= HFSPLUS_FLG_APPEND;
88 	else
89 		perms->rootflags &= ~HFSPLUS_FLG_APPEND;
90 
91 	perms->userflags = HFSPLUS_I(inode)->userflags;
92 	perms->mode = cpu_to_be16(inode->i_mode);
93 	perms->owner = cpu_to_be32(i_uid_read(inode));
94 	perms->group = cpu_to_be32(i_gid_read(inode));
95 
96 	if (S_ISREG(inode->i_mode))
97 		perms->dev = cpu_to_be32(inode->i_nlink);
98 	else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
99 		perms->dev = cpu_to_be32(inode->i_rdev);
100 	else
101 		perms->dev = 0;
102 }
103 
104 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
105 		u32 cnid, struct inode *inode)
106 {
107 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
108 
109 	if (S_ISDIR(inode->i_mode)) {
110 		struct hfsplus_cat_folder *folder;
111 
112 		folder = &entry->folder;
113 		memset(folder, 0, sizeof(*folder));
114 		folder->type = cpu_to_be16(HFSPLUS_FOLDER);
115 		if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags))
116 			folder->flags |= cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT);
117 		folder->id = cpu_to_be32(inode->i_ino);
118 		HFSPLUS_I(inode)->create_date =
119 			folder->create_date =
120 			folder->content_mod_date =
121 			folder->attribute_mod_date =
122 			folder->access_date = hfsp_now2mt();
123 		hfsplus_cat_set_perms(inode, &folder->permissions);
124 		if (inode == sbi->hidden_dir)
125 			/* invisible and namelocked */
126 			folder->user_info.frFlags = cpu_to_be16(0x5000);
127 		return sizeof(*folder);
128 	} else {
129 		struct hfsplus_cat_file *file;
130 
131 		file = &entry->file;
132 		memset(file, 0, sizeof(*file));
133 		file->type = cpu_to_be16(HFSPLUS_FILE);
134 		file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
135 		file->id = cpu_to_be32(cnid);
136 		HFSPLUS_I(inode)->create_date =
137 			file->create_date =
138 			file->content_mod_date =
139 			file->attribute_mod_date =
140 			file->access_date = hfsp_now2mt();
141 		if (cnid == inode->i_ino) {
142 			hfsplus_cat_set_perms(inode, &file->permissions);
143 			if (S_ISLNK(inode->i_mode)) {
144 				file->user_info.fdType =
145 					cpu_to_be32(HFSP_SYMLINK_TYPE);
146 				file->user_info.fdCreator =
147 					cpu_to_be32(HFSP_SYMLINK_CREATOR);
148 			} else {
149 				file->user_info.fdType =
150 					cpu_to_be32(sbi->type);
151 				file->user_info.fdCreator =
152 					cpu_to_be32(sbi->creator);
153 			}
154 			if (HFSPLUS_FLG_IMMUTABLE &
155 					(file->permissions.rootflags |
156 					file->permissions.userflags))
157 				file->flags |=
158 					cpu_to_be16(HFSPLUS_FILE_LOCKED);
159 		} else {
160 			file->user_info.fdType =
161 				cpu_to_be32(HFSP_HARDLINK_TYPE);
162 			file->user_info.fdCreator =
163 				cpu_to_be32(HFSP_HFSPLUS_CREATOR);
164 			file->user_info.fdFlags =
165 				cpu_to_be16(0x100);
166 			file->create_date =
167 				HFSPLUS_I(sbi->hidden_dir)->create_date;
168 			file->permissions.dev =
169 				cpu_to_be32(HFSPLUS_I(inode)->linkid);
170 		}
171 		return sizeof(*file);
172 	}
173 }
174 
175 static int hfsplus_fill_cat_thread(struct super_block *sb,
176 				   hfsplus_cat_entry *entry, int type,
177 				   u32 parentid, struct qstr *str)
178 {
179 	int err;
180 
181 	entry->type = cpu_to_be16(type);
182 	entry->thread.reserved = 0;
183 	entry->thread.parentID = cpu_to_be32(parentid);
184 	err = hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
185 				str->name, str->len);
186 	if (unlikely(err < 0))
187 		return err;
188 
189 	return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
190 }
191 
192 /* Try to get a catalog entry for given catalog id */
193 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
194 		     struct hfs_find_data *fd)
195 {
196 	hfsplus_cat_entry tmp;
197 	int err;
198 	u16 type;
199 
200 	hfsplus_cat_build_key_with_cnid(sb, fd->search_key, cnid);
201 	err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
202 	if (err)
203 		return err;
204 
205 	type = be16_to_cpu(tmp.type);
206 	if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
207 		pr_err("found bad thread record in catalog\n");
208 		return -EIO;
209 	}
210 
211 	if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
212 		pr_err("catalog name length corrupted\n");
213 		return -EIO;
214 	}
215 
216 	hfsplus_cat_build_key_uni(fd->search_key,
217 		be32_to_cpu(tmp.thread.parentID),
218 		&tmp.thread.nodeName);
219 	return hfs_brec_find(fd, hfs_find_rec_by_key);
220 }
221 
222 static void hfsplus_subfolders_inc(struct inode *dir)
223 {
224 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
225 
226 	if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
227 		/*
228 		 * Increment subfolder count. Note, the value is only meaningful
229 		 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
230 		 */
231 		HFSPLUS_I(dir)->subfolders++;
232 	}
233 }
234 
235 static void hfsplus_subfolders_dec(struct inode *dir)
236 {
237 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
238 
239 	if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
240 		/*
241 		 * Decrement subfolder count. Note, the value is only meaningful
242 		 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
243 		 *
244 		 * Check for zero. Some subfolders may have been created
245 		 * by an implementation ignorant of this counter.
246 		 */
247 		if (HFSPLUS_I(dir)->subfolders)
248 			HFSPLUS_I(dir)->subfolders--;
249 	}
250 }
251 
252 int hfsplus_create_cat(u32 cnid, struct inode *dir,
253 		struct qstr *str, struct inode *inode)
254 {
255 	struct super_block *sb = dir->i_sb;
256 	struct hfs_find_data fd;
257 	hfsplus_cat_entry entry;
258 	int entry_size;
259 	int err;
260 
261 	hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
262 		str->name, cnid, inode->i_nlink);
263 	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
264 	if (err)
265 		return err;
266 
267 	hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
268 	entry_size = hfsplus_fill_cat_thread(sb, &entry,
269 		S_ISDIR(inode->i_mode) ?
270 			HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
271 		dir->i_ino, str);
272 	if (unlikely(entry_size < 0)) {
273 		err = entry_size;
274 		goto err2;
275 	}
276 
277 	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
278 	if (err != -ENOENT) {
279 		if (!err)
280 			err = -EEXIST;
281 		goto err2;
282 	}
283 	err = hfs_brec_insert(&fd, &entry, entry_size);
284 	if (err)
285 		goto err2;
286 
287 	err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
288 	if (unlikely(err))
289 		goto err1;
290 
291 	entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
292 	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
293 	if (err != -ENOENT) {
294 		/* panic? */
295 		if (!err)
296 			err = -EEXIST;
297 		goto err1;
298 	}
299 	err = hfs_brec_insert(&fd, &entry, entry_size);
300 	if (err)
301 		goto err1;
302 
303 	dir->i_size++;
304 	if (S_ISDIR(inode->i_mode))
305 		hfsplus_subfolders_inc(dir);
306 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
307 	hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
308 
309 	hfs_find_exit(&fd);
310 	return 0;
311 
312 err1:
313 	hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
314 	if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
315 		hfs_brec_remove(&fd);
316 err2:
317 	hfs_find_exit(&fd);
318 	return err;
319 }
320 
321 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
322 {
323 	struct super_block *sb = dir->i_sb;
324 	struct hfs_find_data fd;
325 	struct hfsplus_fork_raw fork;
326 	struct list_head *pos;
327 	int err, off;
328 	u16 type;
329 
330 	hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
331 	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
332 	if (err)
333 		return err;
334 
335 	if (!str) {
336 		int len;
337 
338 		hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
339 		err = hfs_brec_find(&fd, hfs_find_rec_by_key);
340 		if (err)
341 			goto out;
342 
343 		off = fd.entryoffset +
344 			offsetof(struct hfsplus_cat_thread, nodeName);
345 		fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
346 		hfs_bnode_read(fd.bnode,
347 			&fd.search_key->cat.name.length, off, 2);
348 		len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
349 		hfs_bnode_read(fd.bnode,
350 			&fd.search_key->cat.name.unicode,
351 			off + 2, len);
352 		fd.search_key->key_len = cpu_to_be16(6 + len);
353 	} else {
354 		err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
355 		if (unlikely(err))
356 			goto out;
357 	}
358 
359 	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
360 	if (err)
361 		goto out;
362 
363 	type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
364 	if (type == HFSPLUS_FILE) {
365 #if 0
366 		off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
367 		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
368 		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
369 #endif
370 
371 		off = fd.entryoffset +
372 			offsetof(struct hfsplus_cat_file, rsrc_fork);
373 		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
374 		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
375 	}
376 
377 	/* we only need to take spinlock for exclusion with ->release() */
378 	spin_lock(&HFSPLUS_I(dir)->open_dir_lock);
379 	list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
380 		struct hfsplus_readdir_data *rd =
381 			list_entry(pos, struct hfsplus_readdir_data, list);
382 		if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
383 			rd->file->f_pos--;
384 	}
385 	spin_unlock(&HFSPLUS_I(dir)->open_dir_lock);
386 
387 	err = hfs_brec_remove(&fd);
388 	if (err)
389 		goto out;
390 
391 	hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
392 	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
393 	if (err)
394 		goto out;
395 
396 	err = hfs_brec_remove(&fd);
397 	if (err)
398 		goto out;
399 
400 	dir->i_size--;
401 	if (type == HFSPLUS_FOLDER)
402 		hfsplus_subfolders_dec(dir);
403 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
404 	hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
405 
406 	if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
407 		if (HFSPLUS_SB(sb)->attr_tree)
408 			hfsplus_delete_all_attrs(dir, cnid);
409 	}
410 
411 out:
412 	hfs_find_exit(&fd);
413 
414 	return err;
415 }
416 
417 int hfsplus_rename_cat(u32 cnid,
418 		       struct inode *src_dir, struct qstr *src_name,
419 		       struct inode *dst_dir, struct qstr *dst_name)
420 {
421 	struct super_block *sb = src_dir->i_sb;
422 	struct hfs_find_data src_fd, dst_fd;
423 	hfsplus_cat_entry entry;
424 	int entry_size, type;
425 	int err;
426 
427 	hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
428 		cnid, src_dir->i_ino, src_name->name,
429 		dst_dir->i_ino, dst_name->name);
430 	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
431 	if (err)
432 		return err;
433 	dst_fd = src_fd;
434 
435 	/* find the old dir entry and read the data */
436 	err = hfsplus_cat_build_key(sb, src_fd.search_key,
437 			src_dir->i_ino, src_name);
438 	if (unlikely(err))
439 		goto out;
440 
441 	err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
442 	if (err)
443 		goto out;
444 	if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
445 		err = -EIO;
446 		goto out;
447 	}
448 
449 	hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
450 				src_fd.entrylength);
451 	type = be16_to_cpu(entry.type);
452 
453 	/* create new dir entry with the data from the old entry */
454 	err = hfsplus_cat_build_key(sb, dst_fd.search_key,
455 			dst_dir->i_ino, dst_name);
456 	if (unlikely(err))
457 		goto out;
458 
459 	err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
460 	if (err != -ENOENT) {
461 		if (!err)
462 			err = -EEXIST;
463 		goto out;
464 	}
465 
466 	err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
467 	if (err)
468 		goto out;
469 	dst_dir->i_size++;
470 	if (type == HFSPLUS_FOLDER)
471 		hfsplus_subfolders_inc(dst_dir);
472 	dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
473 
474 	/* finally remove the old entry */
475 	err = hfsplus_cat_build_key(sb, src_fd.search_key,
476 			src_dir->i_ino, src_name);
477 	if (unlikely(err))
478 		goto out;
479 
480 	err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
481 	if (err)
482 		goto out;
483 	err = hfs_brec_remove(&src_fd);
484 	if (err)
485 		goto out;
486 	src_dir->i_size--;
487 	if (type == HFSPLUS_FOLDER)
488 		hfsplus_subfolders_dec(src_dir);
489 	src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
490 
491 	/* remove old thread entry */
492 	hfsplus_cat_build_key_with_cnid(sb, src_fd.search_key, cnid);
493 	err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
494 	if (err)
495 		goto out;
496 	type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
497 	err = hfs_brec_remove(&src_fd);
498 	if (err)
499 		goto out;
500 
501 	/* create new thread entry */
502 	hfsplus_cat_build_key_with_cnid(sb, dst_fd.search_key, cnid);
503 	entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
504 		dst_dir->i_ino, dst_name);
505 	if (unlikely(entry_size < 0)) {
506 		err = entry_size;
507 		goto out;
508 	}
509 
510 	err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
511 	if (err != -ENOENT) {
512 		if (!err)
513 			err = -EEXIST;
514 		goto out;
515 	}
516 	err = hfs_brec_insert(&dst_fd, &entry, entry_size);
517 
518 	hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
519 	hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
520 out:
521 	hfs_bnode_put(dst_fd.bnode);
522 	hfs_find_exit(&src_fd);
523 	return err;
524 }
525