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 
hfsplus_cat_case_cmp_key(const hfsplus_btree_key * k1,const hfsplus_btree_key * k2)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 
hfsplus_cat_bin_cmp_key(const hfsplus_btree_key * k1,const hfsplus_btree_key * k2)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 
hfsplus_cat_build_key(struct super_block * sb,hfsplus_btree_key * key,u32 parent,struct qstr * str)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, str->name, str->len);
49 		len = be16_to_cpu(key->cat.name.length);
50 	} else {
51 		key->cat.name.length = 0;
52 		len = 0;
53 	}
54 	key->key_len = cpu_to_be16(6 + 2 * len);
55 }
56 
hfsplus_cat_build_key_uni(hfsplus_btree_key * key,u32 parent,struct hfsplus_unistr * name)57 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
58 				      struct hfsplus_unistr *name)
59 {
60 	int ustrlen;
61 
62 	ustrlen = be16_to_cpu(name->length);
63 	key->cat.parent = cpu_to_be32(parent);
64 	key->cat.name.length = cpu_to_be16(ustrlen);
65 	ustrlen *= 2;
66 	memcpy(key->cat.name.unicode, name->unicode, ustrlen);
67 	key->key_len = cpu_to_be16(6 + ustrlen);
68 }
69 
hfsplus_cat_set_perms(struct inode * inode,struct hfsplus_perm * perms)70 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
71 {
72 	if (inode->i_flags & S_IMMUTABLE)
73 		perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
74 	else
75 		perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
76 	if (inode->i_flags & S_APPEND)
77 		perms->rootflags |= HFSPLUS_FLG_APPEND;
78 	else
79 		perms->rootflags &= ~HFSPLUS_FLG_APPEND;
80 
81 	perms->userflags = HFSPLUS_I(inode)->userflags;
82 	perms->mode = cpu_to_be16(inode->i_mode);
83 	perms->owner = cpu_to_be32(inode->i_uid);
84 	perms->group = cpu_to_be32(inode->i_gid);
85 
86 	if (S_ISREG(inode->i_mode))
87 		perms->dev = cpu_to_be32(inode->i_nlink);
88 	else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
89 		perms->dev = cpu_to_be32(inode->i_rdev);
90 	else
91 		perms->dev = 0;
92 }
93 
hfsplus_cat_build_record(hfsplus_cat_entry * entry,u32 cnid,struct inode * inode)94 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
95 		u32 cnid, struct inode *inode)
96 {
97 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
98 
99 	if (S_ISDIR(inode->i_mode)) {
100 		struct hfsplus_cat_folder *folder;
101 
102 		folder = &entry->folder;
103 		memset(folder, 0, sizeof(*folder));
104 		folder->type = cpu_to_be16(HFSPLUS_FOLDER);
105 		folder->id = cpu_to_be32(inode->i_ino);
106 		HFSPLUS_I(inode)->create_date =
107 			folder->create_date =
108 			folder->content_mod_date =
109 			folder->attribute_mod_date =
110 			folder->access_date = hfsp_now2mt();
111 		hfsplus_cat_set_perms(inode, &folder->permissions);
112 		if (inode == sbi->hidden_dir)
113 			/* invisible and namelocked */
114 			folder->user_info.frFlags = cpu_to_be16(0x5000);
115 		return sizeof(*folder);
116 	} else {
117 		struct hfsplus_cat_file *file;
118 
119 		file = &entry->file;
120 		memset(file, 0, sizeof(*file));
121 		file->type = cpu_to_be16(HFSPLUS_FILE);
122 		file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
123 		file->id = cpu_to_be32(cnid);
124 		HFSPLUS_I(inode)->create_date =
125 			file->create_date =
126 			file->content_mod_date =
127 			file->attribute_mod_date =
128 			file->access_date = hfsp_now2mt();
129 		if (cnid == inode->i_ino) {
130 			hfsplus_cat_set_perms(inode, &file->permissions);
131 			if (S_ISLNK(inode->i_mode)) {
132 				file->user_info.fdType =
133 					cpu_to_be32(HFSP_SYMLINK_TYPE);
134 				file->user_info.fdCreator =
135 					cpu_to_be32(HFSP_SYMLINK_CREATOR);
136 			} else {
137 				file->user_info.fdType =
138 					cpu_to_be32(sbi->type);
139 				file->user_info.fdCreator =
140 					cpu_to_be32(sbi->creator);
141 			}
142 			if (HFSPLUS_FLG_IMMUTABLE &
143 					(file->permissions.rootflags |
144 					file->permissions.userflags))
145 				file->flags |=
146 					cpu_to_be16(HFSPLUS_FILE_LOCKED);
147 		} else {
148 			file->user_info.fdType =
149 				cpu_to_be32(HFSP_HARDLINK_TYPE);
150 			file->user_info.fdCreator =
151 				cpu_to_be32(HFSP_HFSPLUS_CREATOR);
152 			file->user_info.fdFlags =
153 				cpu_to_be16(0x100);
154 			file->create_date =
155 				HFSPLUS_I(sbi->hidden_dir)->create_date;
156 			file->permissions.dev =
157 				cpu_to_be32(HFSPLUS_I(inode)->linkid);
158 		}
159 		return sizeof(*file);
160 	}
161 }
162 
hfsplus_fill_cat_thread(struct super_block * sb,hfsplus_cat_entry * entry,int type,u32 parentid,struct qstr * str)163 static int hfsplus_fill_cat_thread(struct super_block *sb,
164 				   hfsplus_cat_entry *entry, int type,
165 				   u32 parentid, struct qstr *str)
166 {
167 	entry->type = cpu_to_be16(type);
168 	entry->thread.reserved = 0;
169 	entry->thread.parentID = cpu_to_be32(parentid);
170 	hfsplus_asc2uni(sb, &entry->thread.nodeName, str->name, str->len);
171 	return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
172 }
173 
174 /* Try to get a catalog entry for given catalog id */
hfsplus_find_cat(struct super_block * sb,u32 cnid,struct hfs_find_data * fd)175 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
176 		     struct hfs_find_data *fd)
177 {
178 	hfsplus_cat_entry tmp;
179 	int err;
180 	u16 type;
181 
182 	hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
183 	err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
184 	if (err)
185 		return err;
186 
187 	type = be16_to_cpu(tmp.type);
188 	if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
189 		printk(KERN_ERR "hfs: found bad thread record in catalog\n");
190 		return -EIO;
191 	}
192 
193 	if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
194 		printk(KERN_ERR "hfs: catalog name length corrupted\n");
195 		return -EIO;
196 	}
197 
198 	hfsplus_cat_build_key_uni(fd->search_key,
199 		be32_to_cpu(tmp.thread.parentID),
200 		&tmp.thread.nodeName);
201 	return hfs_brec_find(fd);
202 }
203 
hfsplus_create_cat(u32 cnid,struct inode * dir,struct qstr * str,struct inode * inode)204 int hfsplus_create_cat(u32 cnid, struct inode *dir,
205 		struct qstr *str, struct inode *inode)
206 {
207 	struct super_block *sb = dir->i_sb;
208 	struct hfs_find_data fd;
209 	hfsplus_cat_entry entry;
210 	int entry_size;
211 	int err;
212 
213 	dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n",
214 		str->name, cnid, inode->i_nlink);
215 	hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
216 
217 	hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
218 	entry_size = hfsplus_fill_cat_thread(sb, &entry,
219 		S_ISDIR(inode->i_mode) ?
220 			HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
221 		dir->i_ino, str);
222 	err = hfs_brec_find(&fd);
223 	if (err != -ENOENT) {
224 		if (!err)
225 			err = -EEXIST;
226 		goto err2;
227 	}
228 	err = hfs_brec_insert(&fd, &entry, entry_size);
229 	if (err)
230 		goto err2;
231 
232 	hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
233 	entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
234 	err = hfs_brec_find(&fd);
235 	if (err != -ENOENT) {
236 		/* panic? */
237 		if (!err)
238 			err = -EEXIST;
239 		goto err1;
240 	}
241 	err = hfs_brec_insert(&fd, &entry, entry_size);
242 	if (err)
243 		goto err1;
244 
245 	dir->i_size++;
246 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
247 	hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
248 
249 	hfs_find_exit(&fd);
250 	return 0;
251 
252 err1:
253 	hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
254 	if (!hfs_brec_find(&fd))
255 		hfs_brec_remove(&fd);
256 err2:
257 	hfs_find_exit(&fd);
258 	return err;
259 }
260 
hfsplus_delete_cat(u32 cnid,struct inode * dir,struct qstr * str)261 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
262 {
263 	struct super_block *sb = dir->i_sb;
264 	struct hfs_find_data fd;
265 	struct hfsplus_fork_raw fork;
266 	struct list_head *pos;
267 	int err, off;
268 	u16 type;
269 
270 	dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n",
271 		str ? str->name : NULL, cnid);
272 	hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
273 
274 	if (!str) {
275 		int len;
276 
277 		hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
278 		err = hfs_brec_find(&fd);
279 		if (err)
280 			goto out;
281 
282 		off = fd.entryoffset +
283 			offsetof(struct hfsplus_cat_thread, nodeName);
284 		fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
285 		hfs_bnode_read(fd.bnode,
286 			&fd.search_key->cat.name.length, off, 2);
287 		len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
288 		hfs_bnode_read(fd.bnode,
289 			&fd.search_key->cat.name.unicode,
290 			off + 2, len);
291 		fd.search_key->key_len = cpu_to_be16(6 + len);
292 	} else
293 		hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
294 
295 	err = hfs_brec_find(&fd);
296 	if (err)
297 		goto out;
298 
299 	type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
300 	if (type == HFSPLUS_FILE) {
301 #if 0
302 		off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
303 		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
304 		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
305 #endif
306 
307 		off = fd.entryoffset +
308 			offsetof(struct hfsplus_cat_file, rsrc_fork);
309 		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
310 		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
311 	}
312 
313 	list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
314 		struct hfsplus_readdir_data *rd =
315 			list_entry(pos, struct hfsplus_readdir_data, list);
316 		if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
317 			rd->file->f_pos--;
318 	}
319 
320 	err = hfs_brec_remove(&fd);
321 	if (err)
322 		goto out;
323 
324 	hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
325 	err = hfs_brec_find(&fd);
326 	if (err)
327 		goto out;
328 
329 	err = hfs_brec_remove(&fd);
330 	if (err)
331 		goto out;
332 
333 	dir->i_size--;
334 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
335 	hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
336 out:
337 	hfs_find_exit(&fd);
338 
339 	return err;
340 }
341 
hfsplus_rename_cat(u32 cnid,struct inode * src_dir,struct qstr * src_name,struct inode * dst_dir,struct qstr * dst_name)342 int hfsplus_rename_cat(u32 cnid,
343 		       struct inode *src_dir, struct qstr *src_name,
344 		       struct inode *dst_dir, struct qstr *dst_name)
345 {
346 	struct super_block *sb = src_dir->i_sb;
347 	struct hfs_find_data src_fd, dst_fd;
348 	hfsplus_cat_entry entry;
349 	int entry_size, type;
350 	int err = 0;
351 
352 	dprint(DBG_CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
353 		cnid, src_dir->i_ino, src_name->name,
354 		dst_dir->i_ino, dst_name->name);
355 	hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
356 	dst_fd = src_fd;
357 
358 	/* find the old dir entry and read the data */
359 	hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
360 	err = hfs_brec_find(&src_fd);
361 	if (err)
362 		goto out;
363 
364 	hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
365 				src_fd.entrylength);
366 
367 	/* create new dir entry with the data from the old entry */
368 	hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
369 	err = hfs_brec_find(&dst_fd);
370 	if (err != -ENOENT) {
371 		if (!err)
372 			err = -EEXIST;
373 		goto out;
374 	}
375 
376 	err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
377 	if (err)
378 		goto out;
379 	dst_dir->i_size++;
380 	dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
381 
382 	/* finally remove the old entry */
383 	hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
384 	err = hfs_brec_find(&src_fd);
385 	if (err)
386 		goto out;
387 	err = hfs_brec_remove(&src_fd);
388 	if (err)
389 		goto out;
390 	src_dir->i_size--;
391 	src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
392 
393 	/* remove old thread entry */
394 	hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
395 	err = hfs_brec_find(&src_fd);
396 	if (err)
397 		goto out;
398 	type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
399 	err = hfs_brec_remove(&src_fd);
400 	if (err)
401 		goto out;
402 
403 	/* create new thread entry */
404 	hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
405 	entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
406 		dst_dir->i_ino, dst_name);
407 	err = hfs_brec_find(&dst_fd);
408 	if (err != -ENOENT) {
409 		if (!err)
410 			err = -EEXIST;
411 		goto out;
412 	}
413 	err = hfs_brec_insert(&dst_fd, &entry, entry_size);
414 
415 	hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
416 	hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
417 out:
418 	hfs_bnode_put(dst_fd.bnode);
419 	hfs_find_exit(&src_fd);
420 	return err;
421 }
422