aboutsummaryrefslogtreecommitdiff
path: root/fs/hfs/catalog.c
blob: 8a66405b0f8b5abddd78bc7b39b783649a44b687 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
/*
 *  linux/fs/hfs/catalog.c
 *
 * Copyright (C) 1995-1997  Paul H. Hargrove
 * (C) 2003 Ardis Technologies <roman@ardistech.com>
 * This file may be distributed under the terms of the GNU General Public License.
 *
 * This file contains the functions related to the catalog B-tree.
 *
 * Cache code shamelessly stolen from
 *     linux/fs/inode.c Copyright (C) 1991, 1992  Linus Torvalds
 *     re-shamelessly stolen Copyright (C) 1997 Linus Torvalds
 */

#include "hfs_fs.h"
#include "btree.h"

/*
 * hfs_cat_build_key()
 *
 * Given the ID of the parent and the name build a search key.
 */
void hfs_cat_build_key(struct super_block *sb, btree_key *key, u32 parent, const struct qstr *name)
{
	key->cat.reserved = 0;
	key->cat.ParID = cpu_to_be32(parent);
	if (name) {
		hfs_asc2mac(sb, &key->cat.CName, name);
		key->key_len = 6 + key->cat.CName.len;
	} else {
		memset(&key->cat.CName, 0, sizeof(struct hfs_name));
		key->key_len = 6;
	}
}

static int hfs_cat_build_record(hfs_cat_rec *rec, u32 cnid, struct inode *inode)
{
	__be32 mtime = hfs_mtime();

	memset(rec, 0, sizeof(*rec));
	if (S_ISDIR(inode->i_mode)) {
		rec->type = HFS_CDR_DIR;
		rec->dir.DirID = cpu_to_be32(cnid);
		rec->dir.CrDat = mtime;
		rec->dir.MdDat = mtime;
		rec->dir.BkDat = 0;
		rec->dir.UsrInfo.frView = cpu_to_be16(0xff);
		return sizeof(struct hfs_cat_dir);
	} else {
		/* init some fields for the file record */
		rec->type = HFS_CDR_FIL;
		rec->file.Flags = HFS_FIL_USED | HFS_FIL_THD;
		if (!(inode->i_mode & S_IWUSR))
			rec->file.Flags |= HFS_FIL_LOCK;
		rec->file.FlNum = cpu_to_be32(cnid);
		rec->file.CrDat = mtime;
		rec->file.MdDat = mtime;
		rec->file.BkDat = 0;
		rec->file.UsrWds.fdType = HFS_SB(inode->i_sb)->s_type;
		rec->file.UsrWds.fdCreator = HFS_SB(inode->i_sb)->s_creator;
		return sizeof(struct hfs_cat_file);
	}
}

static int hfs_cat_build_thread(struct super_block *sb,
				hfs_cat_rec *rec, int type,
				u32 parentid, const struct qstr *name)
{
	rec->type = type;
	memset(rec->thread.reserved, 0, sizeof(rec->thread.reserved));
	rec->thread.ParID = cpu_to_be32(parentid);
	hfs_asc2mac(sb, &rec->thread.CName, name);
	return sizeof(struct hfs_cat_thread);
}

/*
 * create_entry()
 *
 * Add a new file or directory to the catalog B-tree and
 * return a (struct hfs_cat_entry) for it in '*result'.
 */
int hfs_cat_create(u32 cnid, struct inode *dir, const struct qstr *str, struct inode *inode)
{
	struct hfs_find_data fd;
	struct super_block *sb;
	union hfs_cat_rec entry;
	int entry_size;
	int err;

	hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
		str->name, cnid, inode->i_nlink);
	if (dir->i_size >= HFS_MAX_VALENCE)
		return -ENOSPC;

	sb = dir->i_sb;
	err = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	if (err)
		return err;

	hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
	entry_size = hfs_cat_build_thread(sb, &entry, S_ISDIR(inode->i_mode) ?
			HFS_CDR_THD : HFS_CDR_FTH,
			dir->i_ino, str);
	err = hfs_brec_find(&fd);
	if (err != -ENOENT) {
		if (!err)
			err = -EEXIST;
		goto err2;
	}
	err = hfs_brec_insert(&fd, &entry, entry_size);
	if (err)
		goto err2;

	hfs_cat_build_key(sb, fd.search_key, dir->i_ino, str);
	entry_size = hfs_cat_build_record(&entry, cnid, inode);
	err = hfs_brec_find(&fd);
	if (err != -ENOENT) {
		/* panic? */
		if (!err)
			err = -EEXIST;
		goto err1;
	}
	err = hfs_brec_insert(&fd, &entry, entry_size);
	if (err)
		goto err1;

	dir->i_size++;
	dir->i_mtime = dir->i_ctime = current_time(dir);
	mark_inode_dirty(dir);
	hfs_find_exit(&fd);
	return 0;

err1:
	hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
	if (!hfs_brec_find(&fd))
		hfs_brec_remove(&fd);
err2:
	hfs_find_exit(&fd);
	return err;
}

/*
 * hfs_cat_compare()
 *
 * Description:
 *   This is the comparison function used for the catalog B-tree.  In
 *   comparing catalog B-tree entries, the parent id is the most
 *   significant field (compared as unsigned ints).  The name field is
 *   the least significant (compared in "Macintosh lexical order",
 *   see hfs_strcmp() in string.c)
 * Input Variable(s):
 *   struct hfs_cat_key *key1: pointer to the first key to compare
 *   struct hfs_cat_key *key2: pointer to the second key to compare
 * Output Variable(s):
 *   NONE
 * Returns:
 *   int: negative if key1<key2, positive if key1>key2, and 0 if key1==key2
 * Preconditions:
 *   key1 and key2 point to "valid" (struct hfs_cat_key)s.
 * Postconditions:
 *   This function has no side-effects
 */
int hfs_cat_keycmp(const btree_key *key1, const btree_key *key2)
{
	__be32 k1p, k2p;

	k1p = key1->cat.ParID;
	k2p = key2->cat.ParID;

	if (k1p != k2p)
		return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;

	return hfs_strcmp(key1->cat.CName.name, key1->cat.CName.len,
			  key2->cat.CName.name, key2->cat.CName.len);
}

/* Try to get a catalog entry for given catalog id */
// move to read_super???
int hfs_cat_find_brec(struct super_block *sb, u32 cnid,
		      struct hfs_find_data *fd)
{
	hfs_cat_rec rec;
	int res, len, type;

	hfs_cat_build_key(sb, fd->search_key, cnid, NULL);
	res = hfs_brec_read(fd, &rec, sizeof(rec));
	if (res)
		return res;

	type = rec.type;
	if (type != HFS_CDR_THD && type != HFS_CDR_FTH) {
		pr_err("found bad thread record in catalog\n");
		return -EIO;
	}

	fd->search_key->cat.ParID = rec.thread.ParID;
	len = fd->search_key->cat.CName.len = rec.thread.CName.len;
	if (len > HFS_NAMELEN) {
		pr_err("bad catalog namelength\n");
		return -EIO;
	}
	memcpy(fd->search_key->cat.CName.name, rec.thread.CName.name, len);
	return hfs_brec_find(fd);
}


/*
 * hfs_cat_delete()
 *
 * Delete the indicated file or directory.
 * The associated thread is also removed unless ('with_thread'==0).
 */
int hfs_cat_delete(u32 cnid, struct inode *dir, const struct qstr *str)
{
	struct super_block *sb;
	struct hfs_find_data fd;
	struct hfs_readdir_data *rd;
	int res, type;

	hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
	sb = dir->i_sb;
	res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	if (res)
		return res;

	hfs_cat_build_key(sb, fd.search_key, dir->i_ino, str);
	res = hfs_brec_find(&fd);
	if (res)
		goto out;

	type = hfs_bnode_read_u8(fd.bnode, fd.entryoffset);
	if (type == HFS_CDR_FIL) {
		struct hfs_cat_file file;
		hfs_bnode_read(fd.bnode, &file, fd.entryoffset, sizeof(file));
		if (be32_to_cpu(file.FlNum) == cnid) {
#if 0
			hfs_free_fork(sb, &file, HFS_FK_DATA);
#endif
			hfs_free_fork(sb, &file, HFS_FK_RSRC);
		}
	}

	/* we only need to take spinlock for exclusion with ->release() */
	spin_lock(&HFS_I(dir)->open_dir_lock);
	list_for_each_entry(rd, &HFS_I(dir)->open_dir_list, list) {
		if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
			rd->file->f_pos--;
	}
	spin_unlock(&HFS_I(dir)->open_dir_lock);

	res = hfs_brec_remove(&fd);
	if (res)
		goto out;

	hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
	res = hfs_brec_find(&fd);
	if (!res) {
		res = hfs_brec_remove(&fd);
		if (res)
			goto out;
	}

	dir->i_size--;
	dir->i_mtime = dir->i_ctime = current_time(dir);
	mark_inode_dirty(dir);
	res = 0;
out:
	hfs_find_exit(&fd);

	return res;
}

/*
 * hfs_cat_move()
 *
 * Rename a file or directory, possibly to a new directory.
 * If the destination exists it is removed and a
 * (struct hfs_cat_entry) for it is returned in '*result'.
 */
int hfs_cat_move(u32 cnid, struct inode *src_dir, const struct qstr *src_name,
		 struct inode *dst_dir, const struct qstr *dst_name)
{
	struct super_block *sb;
	struct hfs_find_data src_fd, dst_fd;
	union hfs_cat_rec entry;
	int entry_size, type;
	int err;

	hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
		cnid, src_dir->i_ino, src_name->name,
		dst_dir->i_ino, dst_name->name);
	sb = src_dir->i_sb;
	err = hfs_find_init(HFS_SB(sb)->cat_tree, &src_fd);
	if (err)
		return err;
	dst_fd = src_fd;

	/* find the old dir entry and read the data */
	hfs_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
	err = hfs_brec_find(&src_fd);
	if (err)
		goto out;
	if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
		err = -EIO;
		goto out;
	}

	hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
			    src_fd.entrylength);

	/* create new dir entry with the data from the old entry */
	hfs_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
	err = hfs_brec_find(&dst_fd);
	if (err != -ENOENT) {
		if (!err)
			err = -EEXIST;
		goto out;
	}

	err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
	if (err)
		goto out;
	dst_dir->i_size++;
	dst_dir->i_mtime = dst_dir->i_ctime = current_time(dst_dir);
	mark_inode_dirty(dst_dir);

	/* finally remove the old entry */
	hfs_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
	err = hfs_brec_find(&src_fd);
	if (err)
		goto out;
	err = hfs_brec_remove(&src_fd);
	if (err)
		goto out;
	src_dir->i_size--;
	src_dir->i_mtime = src_dir->i_ctime = current_time(src_dir);
	mark_inode_dirty(src_dir);

	type = entry.type;
	if (type == HFS_CDR_FIL && !(entry.file.Flags & HFS_FIL_THD))
		goto out;

	/* remove old thread entry */
	hfs_cat_build_key(sb, src_fd.search_key, cnid, NULL);
	err = hfs_brec_find(&src_fd);
	if (err)
		goto out;
	err = hfs_brec_remove(&src_fd);
	if (err)
		goto out;

	/* create new thread entry */
	hfs_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
	entry_size = hfs_cat_build_thread(sb, &entry, type == HFS_CDR_FIL ? HFS_CDR_FTH : HFS_CDR_THD,
					dst_dir->i_ino, dst_name);
	err = hfs_brec_find(&dst_fd);
	if (err != -ENOENT) {
		if (!err)
			err = -EEXIST;
		goto out;
	}
	err = hfs_brec_insert(&dst_fd, &entry, entry_size);
out:
	hfs_bnode_put(dst_fd.bnode);
	hfs_find_exit(&src_fd);
	return err;
}