xref: /openbmc/linux/fs/hfsplus/catalog.c (revision 8569c914) 
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, 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 
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 
70 static void hfsplus_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 	HFSPLUS_I(inode).rootflags = perms->rootflags;
81 	HFSPLUS_I(inode).userflags = perms->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 
87 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry, u32 cnid, struct inode *inode)
88 {
89 	if (S_ISDIR(inode->i_mode)) {
90 		struct hfsplus_cat_folder *folder;
91 
92 		folder = &entry->folder;
93 		memset(folder, 0, sizeof(*folder));
94 		folder->type = cpu_to_be16(HFSPLUS_FOLDER);
95 		folder->id = cpu_to_be32(inode->i_ino);
96 		HFSPLUS_I(inode).create_date =
97 			folder->create_date =
98 			folder->content_mod_date =
99 			folder->attribute_mod_date =
100 			folder->access_date = hfsp_now2mt();
101 		hfsplus_set_perms(inode, &folder->permissions);
102 		if (inode == HFSPLUS_SB(inode->i_sb).hidden_dir)
103 			/* invisible and namelocked */
104 			folder->user_info.frFlags = cpu_to_be16(0x5000);
105 		return sizeof(*folder);
106 	} else {
107 		struct hfsplus_cat_file *file;
108 
109 		file = &entry->file;
110 		memset(file, 0, sizeof(*file));
111 		file->type = cpu_to_be16(HFSPLUS_FILE);
112 		file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
113 		file->id = cpu_to_be32(cnid);
114 		HFSPLUS_I(inode).create_date =
115 			file->create_date =
116 			file->content_mod_date =
117 			file->attribute_mod_date =
118 			file->access_date = hfsp_now2mt();
119 		if (cnid == inode->i_ino) {
120 			hfsplus_set_perms(inode, &file->permissions);
121 			if (S_ISLNK(inode->i_mode)) {
122 				file->user_info.fdType = cpu_to_be32(HFSP_SYMLINK_TYPE);
123 				file->user_info.fdCreator = cpu_to_be32(HFSP_SYMLINK_CREATOR);
124 			} else {
125 				file->user_info.fdType = cpu_to_be32(HFSPLUS_SB(inode->i_sb).type);
126 				file->user_info.fdCreator = cpu_to_be32(HFSPLUS_SB(inode->i_sb).creator);
127 			}
128 			if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
129 				file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
130 		} else {
131 			file->user_info.fdType = cpu_to_be32(HFSP_HARDLINK_TYPE);
132 			file->user_info.fdCreator = cpu_to_be32(HFSP_HFSPLUS_CREATOR);
133 			file->user_info.fdFlags = cpu_to_be16(0x100);
134 			file->create_date = HFSPLUS_I(HFSPLUS_SB(inode->i_sb).hidden_dir).create_date;
135 			file->permissions.dev = cpu_to_be32(HFSPLUS_I(inode).dev);
136 		}
137 		return sizeof(*file);
138 	}
139 }
140 
141 static int hfsplus_fill_cat_thread(struct super_block *sb,
142 				   hfsplus_cat_entry *entry, int type,
143 				   u32 parentid, struct qstr *str)
144 {
145 	entry->type = cpu_to_be16(type);
146 	entry->thread.reserved = 0;
147 	entry->thread.parentID = cpu_to_be32(parentid);
148 	hfsplus_asc2uni(sb, &entry->thread.nodeName, str->name, str->len);
149 	return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
150 }
151 
152 /* Try to get a catalog entry for given catalog id */
153 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
154 		     struct hfs_find_data *fd)
155 {
156 	hfsplus_cat_entry tmp;
157 	int err;
158 	u16 type;
159 
160 	hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
161 	err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
162 	if (err)
163 		return err;
164 
165 	type = be16_to_cpu(tmp.type);
166 	if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
167 		printk(KERN_ERR "hfs: found bad thread record in catalog\n");
168 		return -EIO;
169 	}
170 
171 	if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
172 		printk(KERN_ERR "hfs: catalog name length corrupted\n");
173 		return -EIO;
174 	}
175 
176 	hfsplus_cat_build_key_uni(fd->search_key, be32_to_cpu(tmp.thread.parentID),
177 				 &tmp.thread.nodeName);
178 	return hfs_brec_find(fd);
179 }
180 
181 int hfsplus_create_cat(u32 cnid, struct inode *dir, struct qstr *str, struct inode *inode)
182 {
183 	struct hfs_find_data fd;
184 	struct super_block *sb;
185 	hfsplus_cat_entry entry;
186 	int entry_size;
187 	int err;
188 
189 	dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n", str->name, cnid, inode->i_nlink);
190 	sb = dir->i_sb;
191 	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
192 
193 	hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
194 	entry_size = hfsplus_fill_cat_thread(sb, &entry, S_ISDIR(inode->i_mode) ?
195 			HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
196 			dir->i_ino, str);
197 	err = hfs_brec_find(&fd);
198 	if (err != -ENOENT) {
199 		if (!err)
200 			err = -EEXIST;
201 		goto err2;
202 	}
203 	err = hfs_brec_insert(&fd, &entry, entry_size);
204 	if (err)
205 		goto err2;
206 
207 	hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
208 	entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
209 	err = hfs_brec_find(&fd);
210 	if (err != -ENOENT) {
211 		/* panic? */
212 		if (!err)
213 			err = -EEXIST;
214 		goto err1;
215 	}
216 	err = hfs_brec_insert(&fd, &entry, entry_size);
217 	if (err)
218 		goto err1;
219 
220 	dir->i_size++;
221 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
222 	mark_inode_dirty(dir);
223 	hfs_find_exit(&fd);
224 	return 0;
225 
226 err1:
227 	hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
228 	if (!hfs_brec_find(&fd))
229 		hfs_brec_remove(&fd);
230 err2:
231 	hfs_find_exit(&fd);
232 	return err;
233 }
234 
235 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
236 {
237 	struct super_block *sb;
238 	struct hfs_find_data fd;
239 	struct hfsplus_fork_raw fork;
240 	struct list_head *pos;
241 	int err, off;
242 	u16 type;
243 
244 	dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
245 	sb = dir->i_sb;
246 	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
247 
248 	if (!str) {
249 		int len;
250 
251 		hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
252 		err = hfs_brec_find(&fd);
253 		if (err)
254 			goto out;
255 
256 		off = fd.entryoffset + offsetof(struct hfsplus_cat_thread, nodeName);
257 		fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
258 		hfs_bnode_read(fd.bnode, &fd.search_key->cat.name.length, off, 2);
259 		len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
260 		hfs_bnode_read(fd.bnode, &fd.search_key->cat.name.unicode, off + 2, len);
261 		fd.search_key->key_len = cpu_to_be16(6 + len);
262 	} else
263 		hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
264 
265 	err = hfs_brec_find(&fd);
266 	if (err)
267 		goto out;
268 
269 	type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
270 	if (type == HFSPLUS_FILE) {
271 #if 0
272 		off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
273 		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
274 		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
275 #endif
276 
277 		off = fd.entryoffset + offsetof(struct hfsplus_cat_file, rsrc_fork);
278 		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
279 		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
280 	}
281 
282 	list_for_each(pos, &HFSPLUS_I(dir).open_dir_list) {
283 		struct hfsplus_readdir_data *rd =
284 			list_entry(pos, struct hfsplus_readdir_data, list);
285 		if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
286 			rd->file->f_pos--;
287 	}
288 
289 	err = hfs_brec_remove(&fd);
290 	if (err)
291 		goto out;
292 
293 	hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
294 	err = hfs_brec_find(&fd);
295 	if (err)
296 		goto out;
297 
298 	err = hfs_brec_remove(&fd);
299 	if (err)
300 		goto out;
301 
302 	dir->i_size--;
303 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
304 	mark_inode_dirty(dir);
305 out:
306 	hfs_find_exit(&fd);
307 
308 	return err;
309 }
310 
311 int hfsplus_rename_cat(u32 cnid,
312 		       struct inode *src_dir, struct qstr *src_name,
313 		       struct inode *dst_dir, struct qstr *dst_name)
314 {
315 	struct super_block *sb;
316 	struct hfs_find_data src_fd, dst_fd;
317 	hfsplus_cat_entry entry;
318 	int entry_size, type;
319 	int err = 0;
320 
321 	dprint(DBG_CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n", cnid, src_dir->i_ino, src_name->name,
322 		dst_dir->i_ino, dst_name->name);
323 	sb = src_dir->i_sb;
324 	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &src_fd);
325 	dst_fd = src_fd;
326 
327 	/* find the old dir entry and read the data */
328 	hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
329 	err = hfs_brec_find(&src_fd);
330 	if (err)
331 		goto out;
332 
333 	hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
334 				src_fd.entrylength);
335 
336 	/* create new dir entry with the data from the old entry */
337 	hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
338 	err = hfs_brec_find(&dst_fd);
339 	if (err != -ENOENT) {
340 		if (!err)
341 			err = -EEXIST;
342 		goto out;
343 	}
344 
345 	err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
346 	if (err)
347 		goto out;
348 	dst_dir->i_size++;
349 	dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
350 	mark_inode_dirty(dst_dir);
351 
352 	/* finally remove the old entry */
353 	hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
354 	err = hfs_brec_find(&src_fd);
355 	if (err)
356 		goto out;
357 	err = hfs_brec_remove(&src_fd);
358 	if (err)
359 		goto out;
360 	src_dir->i_size--;
361 	src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
362 	mark_inode_dirty(src_dir);
363 
364 	/* remove old thread entry */
365 	hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
366 	err = hfs_brec_find(&src_fd);
367 	if (err)
368 		goto out;
369 	type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
370 	err = hfs_brec_remove(&src_fd);
371 	if (err)
372 		goto out;
373 
374 	/* create new thread entry */
375 	hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
376 	entry_size = hfsplus_fill_cat_thread(sb, &entry, type, dst_dir->i_ino, dst_name);
377 	err = hfs_brec_find(&dst_fd);
378 	if (err != -ENOENT) {
379 		if (!err)
380 			err = -EEXIST;
381 		goto out;
382 	}
383 	err = hfs_brec_insert(&dst_fd, &entry, entry_size);
384 out:
385 	hfs_bnode_put(dst_fd.bnode);
386 	hfs_find_exit(&src_fd);
387 	return err;
388 }
389