Free Electrons

Embedded Linux Experts

  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
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
/*
 *  linux/fs/hfsplus/catalog.c
 *
 * Copyright (C) 2001
 * Brad Boyer (flar@allandria.com)
 * (C) 2003 Ardis Technologies <roman@ardistech.com>
 *
 * Handling of catalog records
 */


#include "hfsplus_fs.h"
#include "hfsplus_raw.h"

int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
			     const hfsplus_btree_key *k2)
{
	__be32 k1p, k2p;

	k1p = k1->cat.parent;
	k2p = k2->cat.parent;
	if (k1p != k2p)
		return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;

	return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name);
}

int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
			    const hfsplus_btree_key *k2)
{
	__be32 k1p, k2p;

	k1p = k1->cat.parent;
	k2p = k2->cat.parent;
	if (k1p != k2p)
		return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;

	return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
}

/* Generates key for catalog file/folders record. */
int hfsplus_cat_build_key(struct super_block *sb,
		hfsplus_btree_key *key, u32 parent, struct qstr *str)
{
	int len, err;

	key->cat.parent = cpu_to_be32(parent);
	err = hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN,
			str->name, str->len);
	if (unlikely(err < 0))
		return err;

	len = be16_to_cpu(key->cat.name.length);
	key->key_len = cpu_to_be16(6 + 2 * len);
	return 0;
}

/* Generates key for catalog thread record. */
void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
			hfsplus_btree_key *key, u32 parent)
{
	key->cat.parent = cpu_to_be32(parent);
	key->cat.name.length = 0;
	key->key_len = cpu_to_be16(6);
}

static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
				      struct hfsplus_unistr *name)
{
	int ustrlen;

	ustrlen = be16_to_cpu(name->length);
	key->cat.parent = cpu_to_be32(parent);
	key->cat.name.length = cpu_to_be16(ustrlen);
	ustrlen *= 2;
	memcpy(key->cat.name.unicode, name->unicode, ustrlen);
	key->key_len = cpu_to_be16(6 + ustrlen);
}

void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
{
	if (inode->i_flags & S_IMMUTABLE)
		perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
	else
		perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
	if (inode->i_flags & S_APPEND)
		perms->rootflags |= HFSPLUS_FLG_APPEND;
	else
		perms->rootflags &= ~HFSPLUS_FLG_APPEND;

	perms->userflags = HFSPLUS_I(inode)->userflags;
	perms->mode = cpu_to_be16(inode->i_mode);
	perms->owner = cpu_to_be32(i_uid_read(inode));
	perms->group = cpu_to_be32(i_gid_read(inode));

	if (S_ISREG(inode->i_mode))
		perms->dev = cpu_to_be32(inode->i_nlink);
	else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
		perms->dev = cpu_to_be32(inode->i_rdev);
	else
		perms->dev = 0;
}

static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
		u32 cnid, struct inode *inode)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);

	if (S_ISDIR(inode->i_mode)) {
		struct hfsplus_cat_folder *folder;

		folder = &entry->folder;
		memset(folder, 0, sizeof(*folder));
		folder->type = cpu_to_be16(HFSPLUS_FOLDER);
		if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags))
			folder->flags |= cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT);
		folder->id = cpu_to_be32(inode->i_ino);
		HFSPLUS_I(inode)->create_date =
			folder->create_date =
			folder->content_mod_date =
			folder->attribute_mod_date =
			folder->access_date = hfsp_now2mt();
		hfsplus_cat_set_perms(inode, &folder->permissions);
		if (inode == sbi->hidden_dir)
			/* invisible and namelocked */
			folder->user_info.frFlags = cpu_to_be16(0x5000);
		return sizeof(*folder);
	} else {
		struct hfsplus_cat_file *file;

		file = &entry->file;
		memset(file, 0, sizeof(*file));
		file->type = cpu_to_be16(HFSPLUS_FILE);
		file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
		file->id = cpu_to_be32(cnid);
		HFSPLUS_I(inode)->create_date =
			file->create_date =
			file->content_mod_date =
			file->attribute_mod_date =
			file->access_date = hfsp_now2mt();
		if (cnid == inode->i_ino) {
			hfsplus_cat_set_perms(inode, &file->permissions);
			if (S_ISLNK(inode->i_mode)) {
				file->user_info.fdType =
					cpu_to_be32(HFSP_SYMLINK_TYPE);
				file->user_info.fdCreator =
					cpu_to_be32(HFSP_SYMLINK_CREATOR);
			} else {
				file->user_info.fdType =
					cpu_to_be32(sbi->type);
				file->user_info.fdCreator =
					cpu_to_be32(sbi->creator);
			}
			if (HFSPLUS_FLG_IMMUTABLE &
					(file->permissions.rootflags |
					file->permissions.userflags))
				file->flags |=
					cpu_to_be16(HFSPLUS_FILE_LOCKED);
		} else {
			file->user_info.fdType =
				cpu_to_be32(HFSP_HARDLINK_TYPE);
			file->user_info.fdCreator =
				cpu_to_be32(HFSP_HFSPLUS_CREATOR);
			file->user_info.fdFlags =
				cpu_to_be16(0x100);
			file->create_date =
				HFSPLUS_I(sbi->hidden_dir)->create_date;
			file->permissions.dev =
				cpu_to_be32(HFSPLUS_I(inode)->linkid);
		}
		return sizeof(*file);
	}
}

static int hfsplus_fill_cat_thread(struct super_block *sb,
				   hfsplus_cat_entry *entry, int type,
				   u32 parentid, struct qstr *str)
{
	int err;

	entry->type = cpu_to_be16(type);
	entry->thread.reserved = 0;
	entry->thread.parentID = cpu_to_be32(parentid);
	err = hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
				str->name, str->len);
	if (unlikely(err < 0))
		return err;

	return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
}

/* Try to get a catalog entry for given catalog id */
int hfsplus_find_cat(struct super_block *sb, u32 cnid,
		     struct hfs_find_data *fd)
{
	hfsplus_cat_entry tmp;
	int err;
	u16 type;

	hfsplus_cat_build_key_with_cnid(sb, fd->search_key, cnid);
	err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
	if (err)
		return err;

	type = be16_to_cpu(tmp.type);
	if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
		pr_err("found bad thread record in catalog\n");
		return -EIO;
	}

	if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
		pr_err("catalog name length corrupted\n");
		return -EIO;
	}

	hfsplus_cat_build_key_uni(fd->search_key,
		be32_to_cpu(tmp.thread.parentID),
		&tmp.thread.nodeName);
	return hfs_brec_find(fd, hfs_find_rec_by_key);
}

static void hfsplus_subfolders_inc(struct inode *dir)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);

	if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
		/*
		 * Increment subfolder count. Note, the value is only meaningful
		 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
		 */
		HFSPLUS_I(dir)->subfolders++;
	}
}

static void hfsplus_subfolders_dec(struct inode *dir)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);

	if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
		/*
		 * Decrement subfolder count. Note, the value is only meaningful
		 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
		 *
		 * Check for zero. Some subfolders may have been created
		 * by an implementation ignorant of this counter.
		 */
		if (HFSPLUS_I(dir)->subfolders)
			HFSPLUS_I(dir)->subfolders--;
	}
}

int hfsplus_create_cat(u32 cnid, struct inode *dir,
		struct qstr *str, struct inode *inode)
{
	struct super_block *sb = dir->i_sb;
	struct hfs_find_data fd;
	hfsplus_cat_entry entry;
	int entry_size;
	int err;

	hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
		str->name, cnid, inode->i_nlink);
	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	if (err)
		return err;

	hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
	entry_size = hfsplus_fill_cat_thread(sb, &entry,
		S_ISDIR(inode->i_mode) ?
			HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
		dir->i_ino, str);
	if (unlikely(entry_size < 0)) {
		err = entry_size;
		goto err2;
	}

	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
	if (err != -ENOENT) {
		if (!err)
			err = -EEXIST;
		goto err2;
	}
	err = hfs_brec_insert(&fd, &entry, entry_size);
	if (err)
		goto err2;

	err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
	if (unlikely(err))
		goto err1;

	entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
	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++;
	if (S_ISDIR(inode->i_mode))
		hfsplus_subfolders_inc(dir);
	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
	hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);

	hfs_find_exit(&fd);
	return 0;

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

int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
{
	struct super_block *sb = dir->i_sb;
	struct hfs_find_data fd;
	struct hfsplus_fork_raw fork;
	struct list_head *pos;
	int err, off;
	u16 type;

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

	if (!str) {
		int len;

		hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
		err = hfs_brec_find(&fd, hfs_find_rec_by_key);
		if (err)
			goto out;

		off = fd.entryoffset +
			offsetof(struct hfsplus_cat_thread, nodeName);
		fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
		hfs_bnode_read(fd.bnode,
			&fd.search_key->cat.name.length, off, 2);
		len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
		hfs_bnode_read(fd.bnode,
			&fd.search_key->cat.name.unicode,
			off + 2, len);
		fd.search_key->key_len = cpu_to_be16(6 + len);
	} else {
		err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
		if (unlikely(err))
			goto out;
	}

	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
	if (err)
		goto out;

	type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
	if (type == HFSPLUS_FILE) {
#if 0
		off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
#endif

		off = fd.entryoffset +
			offsetof(struct hfsplus_cat_file, rsrc_fork);
		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
	}

	list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
		struct hfsplus_readdir_data *rd =
			list_entry(pos, struct hfsplus_readdir_data, list);
		if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
			rd->file->f_pos--;
	}

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

	hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
	if (err)
		goto out;

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

	dir->i_size--;
	if (type == HFSPLUS_FOLDER)
		hfsplus_subfolders_dec(dir);
	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
	hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);

	if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
		if (HFSPLUS_SB(sb)->attr_tree)
			hfsplus_delete_all_attrs(dir, cnid);
	}

out:
	hfs_find_exit(&fd);

	return err;
}

int hfsplus_rename_cat(u32 cnid,
		       struct inode *src_dir, struct qstr *src_name,
		       struct inode *dst_dir, struct qstr *dst_name)
{
	struct super_block *sb = src_dir->i_sb;
	struct hfs_find_data src_fd, dst_fd;
	hfsplus_cat_entry 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);
	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
	if (err)
		return err;
	dst_fd = src_fd;

	/* find the old dir entry and read the data */
	err = hfsplus_cat_build_key(sb, src_fd.search_key,
			src_dir->i_ino, src_name);
	if (unlikely(err))
		goto out;

	err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
	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);
	type = be16_to_cpu(entry.type);

	/* create new dir entry with the data from the old entry */
	err = hfsplus_cat_build_key(sb, dst_fd.search_key,
			dst_dir->i_ino, dst_name);
	if (unlikely(err))
		goto out;

	err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
	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++;
	if (type == HFSPLUS_FOLDER)
		hfsplus_subfolders_inc(dst_dir);
	dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;

	/* finally remove the old entry */
	err = hfsplus_cat_build_key(sb, src_fd.search_key,
			src_dir->i_ino, src_name);
	if (unlikely(err))
		goto out;

	err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
	if (err)
		goto out;
	err = hfs_brec_remove(&src_fd);
	if (err)
		goto out;
	src_dir->i_size--;
	if (type == HFSPLUS_FOLDER)
		hfsplus_subfolders_dec(src_dir);
	src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;

	/* remove old thread entry */
	hfsplus_cat_build_key_with_cnid(sb, src_fd.search_key, cnid);
	err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
	if (err)
		goto out;
	type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
	err = hfs_brec_remove(&src_fd);
	if (err)
		goto out;

	/* create new thread entry */
	hfsplus_cat_build_key_with_cnid(sb, dst_fd.search_key, cnid);
	entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
		dst_dir->i_ino, dst_name);
	if (unlikely(entry_size < 0)) {
		err = entry_size;
		goto out;
	}

	err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
	if (err != -ENOENT) {
		if (!err)
			err = -EEXIST;
		goto out;
	}
	err = hfs_brec_insert(&dst_fd, &entry, entry_size);

	hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
	hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
out:
	hfs_bnode_put(dst_fd.bnode);
	hfs_find_exit(&src_fd);
	return err;
}