xref: /openbmc/linux/fs/hfsplus/catalog.c (revision b34e08d5)
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 void hfsplus_cat_build_key(struct super_block *sb, hfsplus_btree_key *key,
42 			   u32 parent, struct qstr *str)
43 {
44 	int len;
45 
46 	key->cat.parent = cpu_to_be32(parent);
47 	if (str) {
48 		hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN,
49 					str->name, str->len);
50 		len = be16_to_cpu(key->cat.name.length);
51 	} else {
52 		key->cat.name.length = 0;
53 		len = 0;
54 	}
55 	key->key_len = cpu_to_be16(6 + 2 * len);
56 }
57 
58 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
59 				      struct hfsplus_unistr *name)
60 {
61 	int ustrlen;
62 
63 	ustrlen = be16_to_cpu(name->length);
64 	key->cat.parent = cpu_to_be32(parent);
65 	key->cat.name.length = cpu_to_be16(ustrlen);
66 	ustrlen *= 2;
67 	memcpy(key->cat.name.unicode, name->unicode, ustrlen);
68 	key->key_len = cpu_to_be16(6 + ustrlen);
69 }
70 
71 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
72 {
73 	if (inode->i_flags & S_IMMUTABLE)
74 		perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
75 	else
76 		perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
77 	if (inode->i_flags & S_APPEND)
78 		perms->rootflags |= HFSPLUS_FLG_APPEND;
79 	else
80 		perms->rootflags &= ~HFSPLUS_FLG_APPEND;
81 
82 	perms->userflags = HFSPLUS_I(inode)->userflags;
83 	perms->mode = cpu_to_be16(inode->i_mode);
84 	perms->owner = cpu_to_be32(i_uid_read(inode));
85 	perms->group = cpu_to_be32(i_gid_read(inode));
86 
87 	if (S_ISREG(inode->i_mode))
88 		perms->dev = cpu_to_be32(inode->i_nlink);
89 	else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
90 		perms->dev = cpu_to_be32(inode->i_rdev);
91 	else
92 		perms->dev = 0;
93 }
94 
95 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
96 		u32 cnid, struct inode *inode)
97 {
98 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
99 
100 	if (S_ISDIR(inode->i_mode)) {
101 		struct hfsplus_cat_folder *folder;
102 
103 		folder = &entry->folder;
104 		memset(folder, 0, sizeof(*folder));
105 		folder->type = cpu_to_be16(HFSPLUS_FOLDER);
106 		if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags))
107 			folder->flags |= cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT);
108 		folder->id = cpu_to_be32(inode->i_ino);
109 		HFSPLUS_I(inode)->create_date =
110 			folder->create_date =
111 			folder->content_mod_date =
112 			folder->attribute_mod_date =
113 			folder->access_date = hfsp_now2mt();
114 		hfsplus_cat_set_perms(inode, &folder->permissions);
115 		if (inode == sbi->hidden_dir)
116 			/* invisible and namelocked */
117 			folder->user_info.frFlags = cpu_to_be16(0x5000);
118 		return sizeof(*folder);
119 	} else {
120 		struct hfsplus_cat_file *file;
121 
122 		file = &entry->file;
123 		memset(file, 0, sizeof(*file));
124 		file->type = cpu_to_be16(HFSPLUS_FILE);
125 		file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
126 		file->id = cpu_to_be32(cnid);
127 		HFSPLUS_I(inode)->create_date =
128 			file->create_date =
129 			file->content_mod_date =
130 			file->attribute_mod_date =
131 			file->access_date = hfsp_now2mt();
132 		if (cnid == inode->i_ino) {
133 			hfsplus_cat_set_perms(inode, &file->permissions);
134 			if (S_ISLNK(inode->i_mode)) {
135 				file->user_info.fdType =
136 					cpu_to_be32(HFSP_SYMLINK_TYPE);
137 				file->user_info.fdCreator =
138 					cpu_to_be32(HFSP_SYMLINK_CREATOR);
139 			} else {
140 				file->user_info.fdType =
141 					cpu_to_be32(sbi->type);
142 				file->user_info.fdCreator =
143 					cpu_to_be32(sbi->creator);
144 			}
145 			if (HFSPLUS_FLG_IMMUTABLE &
146 					(file->permissions.rootflags |
147 					file->permissions.userflags))
148 				file->flags |=
149 					cpu_to_be16(HFSPLUS_FILE_LOCKED);
150 		} else {
151 			file->user_info.fdType =
152 				cpu_to_be32(HFSP_HARDLINK_TYPE);
153 			file->user_info.fdCreator =
154 				cpu_to_be32(HFSP_HFSPLUS_CREATOR);
155 			file->user_info.fdFlags =
156 				cpu_to_be16(0x100);
157 			file->create_date =
158 				HFSPLUS_I(sbi->hidden_dir)->create_date;
159 			file->permissions.dev =
160 				cpu_to_be32(HFSPLUS_I(inode)->linkid);
161 		}
162 		return sizeof(*file);
163 	}
164 }
165 
166 static int hfsplus_fill_cat_thread(struct super_block *sb,
167 				   hfsplus_cat_entry *entry, int type,
168 				   u32 parentid, struct qstr *str)
169 {
170 	entry->type = cpu_to_be16(type);
171 	entry->thread.reserved = 0;
172 	entry->thread.parentID = cpu_to_be32(parentid);
173 	hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
174 				str->name, str->len);
175 	return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
176 }
177 
178 /* Try to get a catalog entry for given catalog id */
179 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
180 		     struct hfs_find_data *fd)
181 {
182 	hfsplus_cat_entry tmp;
183 	int err;
184 	u16 type;
185 
186 	hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
187 	err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
188 	if (err)
189 		return err;
190 
191 	type = be16_to_cpu(tmp.type);
192 	if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
193 		pr_err("found bad thread record in catalog\n");
194 		return -EIO;
195 	}
196 
197 	if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
198 		pr_err("catalog name length corrupted\n");
199 		return -EIO;
200 	}
201 
202 	hfsplus_cat_build_key_uni(fd->search_key,
203 		be32_to_cpu(tmp.thread.parentID),
204 		&tmp.thread.nodeName);
205 	return hfs_brec_find(fd, hfs_find_rec_by_key);
206 }
207 
208 static void hfsplus_subfolders_inc(struct inode *dir)
209 {
210 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
211 
212 	if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
213 		/*
214 		 * Increment subfolder count. Note, the value is only meaningful
215 		 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
216 		 */
217 		HFSPLUS_I(dir)->subfolders++;
218 	}
219 }
220 
221 static void hfsplus_subfolders_dec(struct inode *dir)
222 {
223 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
224 
225 	if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
226 		/*
227 		 * Decrement subfolder count. Note, the value is only meaningful
228 		 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
229 		 *
230 		 * Check for zero. Some subfolders may have been created
231 		 * by an implementation ignorant of this counter.
232 		 */
233 		if (HFSPLUS_I(dir)->subfolders)
234 			HFSPLUS_I(dir)->subfolders--;
235 	}
236 }
237 
238 int hfsplus_create_cat(u32 cnid, struct inode *dir,
239 		struct qstr *str, struct inode *inode)
240 {
241 	struct super_block *sb = dir->i_sb;
242 	struct hfs_find_data fd;
243 	hfsplus_cat_entry entry;
244 	int entry_size;
245 	int err;
246 
247 	hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
248 		str->name, cnid, inode->i_nlink);
249 	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
250 	if (err)
251 		return err;
252 
253 	hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
254 	entry_size = hfsplus_fill_cat_thread(sb, &entry,
255 		S_ISDIR(inode->i_mode) ?
256 			HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
257 		dir->i_ino, str);
258 	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
259 	if (err != -ENOENT) {
260 		if (!err)
261 			err = -EEXIST;
262 		goto err2;
263 	}
264 	err = hfs_brec_insert(&fd, &entry, entry_size);
265 	if (err)
266 		goto err2;
267 
268 	hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
269 	entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
270 	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
271 	if (err != -ENOENT) {
272 		/* panic? */
273 		if (!err)
274 			err = -EEXIST;
275 		goto err1;
276 	}
277 	err = hfs_brec_insert(&fd, &entry, entry_size);
278 	if (err)
279 		goto err1;
280 
281 	dir->i_size++;
282 	if (S_ISDIR(inode->i_mode))
283 		hfsplus_subfolders_inc(dir);
284 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
285 	hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
286 
287 	hfs_find_exit(&fd);
288 	return 0;
289 
290 err1:
291 	hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
292 	if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
293 		hfs_brec_remove(&fd);
294 err2:
295 	hfs_find_exit(&fd);
296 	return err;
297 }
298 
299 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
300 {
301 	struct super_block *sb = dir->i_sb;
302 	struct hfs_find_data fd;
303 	struct hfsplus_fork_raw fork;
304 	struct list_head *pos;
305 	int err, off;
306 	u16 type;
307 
308 	hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
309 	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
310 	if (err)
311 		return err;
312 
313 	if (!str) {
314 		int len;
315 
316 		hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
317 		err = hfs_brec_find(&fd, hfs_find_rec_by_key);
318 		if (err)
319 			goto out;
320 
321 		off = fd.entryoffset +
322 			offsetof(struct hfsplus_cat_thread, nodeName);
323 		fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
324 		hfs_bnode_read(fd.bnode,
325 			&fd.search_key->cat.name.length, off, 2);
326 		len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
327 		hfs_bnode_read(fd.bnode,
328 			&fd.search_key->cat.name.unicode,
329 			off + 2, len);
330 		fd.search_key->key_len = cpu_to_be16(6 + len);
331 	} else
332 		hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
333 
334 	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
335 	if (err)
336 		goto out;
337 
338 	type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
339 	if (type == HFSPLUS_FILE) {
340 #if 0
341 		off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
342 		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
343 		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
344 #endif
345 
346 		off = fd.entryoffset +
347 			offsetof(struct hfsplus_cat_file, rsrc_fork);
348 		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
349 		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
350 	}
351 
352 	list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
353 		struct hfsplus_readdir_data *rd =
354 			list_entry(pos, struct hfsplus_readdir_data, list);
355 		if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
356 			rd->file->f_pos--;
357 	}
358 
359 	err = hfs_brec_remove(&fd);
360 	if (err)
361 		goto out;
362 
363 	hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
364 	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
365 	if (err)
366 		goto out;
367 
368 	err = hfs_brec_remove(&fd);
369 	if (err)
370 		goto out;
371 
372 	dir->i_size--;
373 	if (type == HFSPLUS_FOLDER)
374 		hfsplus_subfolders_dec(dir);
375 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
376 	hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
377 
378 	if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
379 		if (HFSPLUS_SB(sb)->attr_tree)
380 			hfsplus_delete_all_attrs(dir, cnid);
381 	}
382 
383 out:
384 	hfs_find_exit(&fd);
385 
386 	return err;
387 }
388 
389 int hfsplus_rename_cat(u32 cnid,
390 		       struct inode *src_dir, struct qstr *src_name,
391 		       struct inode *dst_dir, struct qstr *dst_name)
392 {
393 	struct super_block *sb = src_dir->i_sb;
394 	struct hfs_find_data src_fd, dst_fd;
395 	hfsplus_cat_entry entry;
396 	int entry_size, type;
397 	int err;
398 
399 	hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
400 		cnid, src_dir->i_ino, src_name->name,
401 		dst_dir->i_ino, dst_name->name);
402 	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
403 	if (err)
404 		return err;
405 	dst_fd = src_fd;
406 
407 	/* find the old dir entry and read the data */
408 	hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
409 	err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
410 	if (err)
411 		goto out;
412 	if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
413 		err = -EIO;
414 		goto out;
415 	}
416 
417 	hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
418 				src_fd.entrylength);
419 	type = be16_to_cpu(entry.type);
420 
421 	/* create new dir entry with the data from the old entry */
422 	hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
423 	err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
424 	if (err != -ENOENT) {
425 		if (!err)
426 			err = -EEXIST;
427 		goto out;
428 	}
429 
430 	err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
431 	if (err)
432 		goto out;
433 	dst_dir->i_size++;
434 	if (type == HFSPLUS_FOLDER)
435 		hfsplus_subfolders_inc(dst_dir);
436 	dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
437 
438 	/* finally remove the old entry */
439 	hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
440 	err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
441 	if (err)
442 		goto out;
443 	err = hfs_brec_remove(&src_fd);
444 	if (err)
445 		goto out;
446 	src_dir->i_size--;
447 	if (type == HFSPLUS_FOLDER)
448 		hfsplus_subfolders_dec(src_dir);
449 	src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
450 
451 	/* remove old thread entry */
452 	hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
453 	err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
454 	if (err)
455 		goto out;
456 	type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
457 	err = hfs_brec_remove(&src_fd);
458 	if (err)
459 		goto out;
460 
461 	/* create new thread entry */
462 	hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
463 	entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
464 		dst_dir->i_ino, dst_name);
465 	err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
466 	if (err != -ENOENT) {
467 		if (!err)
468 			err = -EEXIST;
469 		goto out;
470 	}
471 	err = hfs_brec_insert(&dst_fd, &entry, entry_size);
472 
473 	hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
474 	hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
475 out:
476 	hfs_bnode_put(dst_fd.bnode);
477 	hfs_find_exit(&src_fd);
478 	return err;
479 }
480