summaryrefslogtreecommitdiffstats
path: root/fs/hfsplus/xattr.c
blob: e8a4b0815c61e7dc05f8bc7ee3e9e025f52a7696 (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
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
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
/*
 * linux/fs/hfsplus/xattr.c
 *
 * Vyacheslav Dubeyko <slava@dubeyko.com>
 *
 * Logic of processing extended attributes
 */

#include "hfsplus_fs.h"
#include "xattr.h"

const struct xattr_handler *hfsplus_xattr_handlers[] = {
	&hfsplus_xattr_osx_handler,
	&hfsplus_xattr_user_handler,
	&hfsplus_xattr_trusted_handler,
	&hfsplus_xattr_security_handler,
	NULL
};

static int strcmp_xattr_finder_info(const char *name)
{
	if (name) {
		return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME,
				sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME));
	}
	return -1;
}

static int strcmp_xattr_acl(const char *name)
{
	if (name) {
		return strncmp(name, HFSPLUS_XATTR_ACL_NAME,
				sizeof(HFSPLUS_XATTR_ACL_NAME));
	}
	return -1;
}

static inline int is_known_namespace(const char *name)
{
	if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) &&
	    strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) &&
	    strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
	    strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN))
		return false;

	return true;
}

static int can_set_xattr(struct inode *inode, const char *name,
				const void *value, size_t value_len)
{
	if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
		return -EOPNOTSUPP; /* TODO: implement ACL support */

	if (!strncmp(name, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN)) {
		/*
		 * This makes sure that we aren't trying to set an
		 * attribute in a different namespace by prefixing it
		 * with "osx."
		 */
		if (is_known_namespace(name + XATTR_MAC_OSX_PREFIX_LEN))
			return -EOPNOTSUPP;

		return 0;
	}

	/*
	 * Don't allow setting an attribute in an unknown namespace.
	 */
	if (strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) &&
	    strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
	    strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
		return -EOPNOTSUPP;

	return 0;
}

int __hfsplus_setxattr(struct inode *inode, const char *name,
			const void *value, size_t size, int flags)
{
	int err = 0;
	struct hfs_find_data cat_fd;
	hfsplus_cat_entry entry;
	u16 cat_entry_flags, cat_entry_type;
	u16 folder_finderinfo_len = sizeof(struct DInfo) +
					sizeof(struct DXInfo);
	u16 file_finderinfo_len = sizeof(struct FInfo) +
					sizeof(struct FXInfo);

	if ((!S_ISREG(inode->i_mode) &&
			!S_ISDIR(inode->i_mode)) ||
				HFSPLUS_IS_RSRC(inode))
		return -EOPNOTSUPP;

	err = can_set_xattr(inode, name, value, size);
	if (err)
		return err;

	if (strncmp(name, XATTR_MAC_OSX_PREFIX,
				XATTR_MAC_OSX_PREFIX_LEN) == 0)
		name += XATTR_MAC_OSX_PREFIX_LEN;

	if (value == NULL) {
		value = "";
		size = 0;
	}

	err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
	if (err) {
		printk(KERN_ERR "hfs: can't init xattr find struct\n");
		return err;
	}

	err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
	if (err) {
		printk(KERN_ERR "hfs: catalog searching failed\n");
		goto end_setxattr;
	}

	if (!strcmp_xattr_finder_info(name)) {
		if (flags & XATTR_CREATE) {
			printk(KERN_ERR "hfs: xattr exists yet\n");
			err = -EOPNOTSUPP;
			goto end_setxattr;
		}
		hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset,
					sizeof(hfsplus_cat_entry));
		if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) {
			if (size == folder_finderinfo_len) {
				memcpy(&entry.folder.user_info, value,
						folder_finderinfo_len);
				hfs_bnode_write(cat_fd.bnode, &entry,
					cat_fd.entryoffset,
					sizeof(struct hfsplus_cat_folder));
				hfsplus_mark_inode_dirty(inode,
						HFSPLUS_I_CAT_DIRTY);
			} else {
				err = -ERANGE;
				goto end_setxattr;
			}
		} else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) {
			if (size == file_finderinfo_len) {
				memcpy(&entry.file.user_info, value,
						file_finderinfo_len);
				hfs_bnode_write(cat_fd.bnode, &entry,
					cat_fd.entryoffset,
					sizeof(struct hfsplus_cat_file));
				hfsplus_mark_inode_dirty(inode,
						HFSPLUS_I_CAT_DIRTY);
			} else {
				err = -ERANGE;
				goto end_setxattr;
			}
		} else {
			err = -EOPNOTSUPP;
			goto end_setxattr;
		}
		goto end_setxattr;
	}

	if (!HFSPLUS_SB(inode->i_sb)->attr_tree) {
		err = -EOPNOTSUPP;
		goto end_setxattr;
	}

	if (hfsplus_attr_exists(inode, name)) {
		if (flags & XATTR_CREATE) {
			printk(KERN_ERR "hfs: xattr exists yet\n");
			err = -EOPNOTSUPP;
			goto end_setxattr;
		}
		err = hfsplus_delete_attr(inode, name);
		if (err)
			goto end_setxattr;
		err = hfsplus_create_attr(inode, name, value, size);
		if (err)
			goto end_setxattr;
	} else {
		if (flags & XATTR_REPLACE) {
			printk(KERN_ERR "hfs: cannot replace xattr\n");
			err = -EOPNOTSUPP;
			goto end_setxattr;
		}
		err = hfsplus_create_attr(inode, name, value, size);
		if (err)
			goto end_setxattr;
	}

	cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
	if (cat_entry_type == HFSPLUS_FOLDER) {
		cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
				    cat_fd.entryoffset +
				    offsetof(struct hfsplus_cat_folder, flags));
		cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
		if (!strcmp_xattr_acl(name))
			cat_entry_flags |= HFSPLUS_ACL_EXISTS;
		hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
				offsetof(struct hfsplus_cat_folder, flags),
				cat_entry_flags);
		hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
	} else if (cat_entry_type == HFSPLUS_FILE) {
		cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
				    cat_fd.entryoffset +
				    offsetof(struct hfsplus_cat_file, flags));
		cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
		if (!strcmp_xattr_acl(name))
			cat_entry_flags |= HFSPLUS_ACL_EXISTS;
		hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
				    offsetof(struct hfsplus_cat_file, flags),
				    cat_entry_flags);
		hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
	} else {
		printk(KERN_ERR "hfs: invalid catalog entry type\n");
		err = -EIO;
		goto end_setxattr;
	}

end_setxattr:
	hfs_find_exit(&cat_fd);
	return err;
}

static inline int is_osx_xattr(const char *xattr_name)
{
	return !is_known_namespace(xattr_name);
}

static int name_len(const char *xattr_name, int xattr_name_len)
{
	int len = xattr_name_len + 1;

	if (is_osx_xattr(xattr_name))
		len += XATTR_MAC_OSX_PREFIX_LEN;

	return len;
}

static int copy_name(char *buffer, const char *xattr_name, int name_len)
{
	int len = name_len;
	int offset = 0;

	if (is_osx_xattr(xattr_name)) {
		strncpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN);
		offset += XATTR_MAC_OSX_PREFIX_LEN;
		len += XATTR_MAC_OSX_PREFIX_LEN;
	}

	strncpy(buffer + offset, xattr_name, name_len);
	memset(buffer + offset + name_len, 0, 1);
	len += 1;

	return len;
}

static ssize_t hfsplus_getxattr_finder_info(struct dentry *dentry,
						void *value, size_t size)
{
	ssize_t res = 0;
	struct inode *inode = dentry->d_inode;
	struct hfs_find_data fd;
	u16 entry_type;
	u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo);
	u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo);
	u16 record_len = max(folder_rec_len, file_rec_len);
	u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
	u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];

	if (size >= record_len) {
		res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
		if (res) {
			printk(KERN_ERR "hfs: can't init xattr find struct\n");
			return res;
		}
		res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
		if (res)
			goto end_getxattr_finder_info;
		entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);

		if (entry_type == HFSPLUS_FOLDER) {
			hfs_bnode_read(fd.bnode, folder_finder_info,
				fd.entryoffset +
				offsetof(struct hfsplus_cat_folder, user_info),
				folder_rec_len);
			memcpy(value, folder_finder_info, folder_rec_len);
			res = folder_rec_len;
		} else if (entry_type == HFSPLUS_FILE) {
			hfs_bnode_read(fd.bnode, file_finder_info,
				fd.entryoffset +
				offsetof(struct hfsplus_cat_file, user_info),
				file_rec_len);
			memcpy(value, file_finder_info, file_rec_len);
			res = file_rec_len;
		} else {
			res = -EOPNOTSUPP;
			goto end_getxattr_finder_info;
		}
	} else
		res = size ? -ERANGE : record_len;

end_getxattr_finder_info:
	if (size >= record_len)
		hfs_find_exit(&fd);
	return res;
}

ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
			 void *value, size_t size)
{
	struct inode *inode = dentry->d_inode;
	struct hfs_find_data fd;
	hfsplus_attr_entry *entry;
	__be32 xattr_record_type;
	u32 record_type;
	u16 record_length = 0;
	ssize_t res = 0;

	if ((!S_ISREG(inode->i_mode) &&
			!S_ISDIR(inode->i_mode)) ||
				HFSPLUS_IS_RSRC(inode))
		return -EOPNOTSUPP;

	if (strncmp(name, XATTR_MAC_OSX_PREFIX,
				XATTR_MAC_OSX_PREFIX_LEN) == 0) {
		/* skip "osx." prefix */
		name += XATTR_MAC_OSX_PREFIX_LEN;
		/*
		 * Don't allow retrieving properly prefixed attributes
		 * by prepending them with "osx."
		 */
		if (is_known_namespace(name))
			return -EOPNOTSUPP;
	}

	if (!strcmp_xattr_finder_info(name))
		return hfsplus_getxattr_finder_info(dentry, value, size);

	if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
		return -EOPNOTSUPP;

	entry = hfsplus_alloc_attr_entry();
	if (!entry) {
		printk(KERN_ERR "hfs: can't allocate xattr entry\n");
		return -ENOMEM;
	}

	res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
	if (res) {
		printk(KERN_ERR "hfs: can't init xattr find struct\n");
		goto failed_getxattr_init;
	}

	res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd);
	if (res) {
		if (res == -ENOENT)
			res = -ENODATA;
		else
			printk(KERN_ERR "hfs: xattr searching failed\n");
		goto out;
	}

	hfs_bnode_read(fd.bnode, &xattr_record_type,
			fd.entryoffset, sizeof(xattr_record_type));
	record_type = be32_to_cpu(xattr_record_type);
	if (record_type == HFSPLUS_ATTR_INLINE_DATA) {
		record_length = hfs_bnode_read_u16(fd.bnode,
				fd.entryoffset +
				offsetof(struct hfsplus_attr_inline_data,
				length));
		if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) {
			printk(KERN_ERR "hfs: invalid xattr record size\n");
			res = -EIO;
			goto out;
		}
	} else if (record_type == HFSPLUS_ATTR_FORK_DATA ||
			record_type == HFSPLUS_ATTR_EXTENTS) {
		printk(KERN_ERR "hfs: only inline data xattr are supported\n");
		res = -EOPNOTSUPP;
		goto out;
	} else {
		printk(KERN_ERR "hfs: invalid xattr record\n");
		res = -EIO;
		goto out;
	}

	if (size) {
		hfs_bnode_read(fd.bnode, entry, fd.entryoffset,
				offsetof(struct hfsplus_attr_inline_data,
					raw_bytes) + record_length);
	}

	if (size >= record_length) {
		memcpy(value, entry->inline_data.raw_bytes, record_length);
		res = record_length;
	} else
		res = size ? -ERANGE : record_length;

out:
	hfs_find_exit(&fd);

failed_getxattr_init:
	hfsplus_destroy_attr_entry(entry);
	return res;
}

static inline int can_list(const char *xattr_name)
{
	if (!xattr_name)
		return 0;

	return strncmp(xattr_name, XATTR_TRUSTED_PREFIX,
			XATTR_TRUSTED_PREFIX_LEN) ||
				capable(CAP_SYS_ADMIN);
}

static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry,
						char *buffer, size_t size)
{
	ssize_t res = 0;
	struct inode *inode = dentry->d_inode;
	struct hfs_find_data fd;
	u16 entry_type;
	u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
	u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
	unsigned long len, found_bit;
	int xattr_name_len, symbols_count;

	res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
	if (res) {
		printk(KERN_ERR "hfs: can't init xattr find struct\n");
		return res;
	}

	res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
	if (res)
		goto end_listxattr_finder_info;

	entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
	if (entry_type == HFSPLUS_FOLDER) {
		len = sizeof(struct DInfo) + sizeof(struct DXInfo);
		hfs_bnode_read(fd.bnode, folder_finder_info,
				fd.entryoffset +
				offsetof(struct hfsplus_cat_folder, user_info),
				len);
		found_bit = find_first_bit((void *)folder_finder_info, len*8);
	} else if (entry_type == HFSPLUS_FILE) {
		len = sizeof(struct FInfo) + sizeof(struct FXInfo);
		hfs_bnode_read(fd.bnode, file_finder_info,
				fd.entryoffset +
				offsetof(struct hfsplus_cat_file, user_info),
				len);
		found_bit = find_first_bit((void *)file_finder_info, len*8);
	} else {
		res = -EOPNOTSUPP;
		goto end_listxattr_finder_info;
	}

	if (found_bit >= (len*8))
		res = 0;
	else {
		symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1;
		xattr_name_len =
			name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count);
		if (!buffer || !size) {
			if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME))
				res = xattr_name_len;
		} else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) {
			if (size < xattr_name_len)
				res = -ERANGE;
			else {
				res = copy_name(buffer,
						HFSPLUS_XATTR_FINDER_INFO_NAME,
						symbols_count);
			}
		}
	}

end_listxattr_finder_info:
	hfs_find_exit(&fd);

	return res;
}

ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
	ssize_t err;
	ssize_t res = 0;
	struct inode *inode = dentry->d_inode;
	struct hfs_find_data fd;
	u16 key_len = 0;
	struct hfsplus_attr_key attr_key;
	char strbuf[HFSPLUS_ATTR_MAX_STRLEN +
			XATTR_MAC_OSX_PREFIX_LEN + 1] = {0};
	int xattr_name_len;

	if ((!S_ISREG(inode->i_mode) &&
			!S_ISDIR(inode->i_mode)) ||
				HFSPLUS_IS_RSRC(inode))
		return -EOPNOTSUPP;

	res = hfsplus_listxattr_finder_info(dentry, buffer, size);
	if (res < 0)
		return res;
	else if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
		return (res == 0) ? -EOPNOTSUPP : res;

	err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
	if (err) {
		printk(KERN_ERR "hfs: can't init xattr find struct\n");
		return err;
	}

	err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd);
	if (err) {
		if (err == -ENOENT) {
			if (res == 0)
				res = -ENODATA;
			goto end_listxattr;
		} else {
			res = err;
			goto end_listxattr;
		}
	}

	for (;;) {
		key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset);
		if (key_len == 0 || key_len > fd.tree->max_key_len) {
			printk(KERN_ERR "hfs: invalid xattr key length: %d\n",
							key_len);
			res = -EIO;
			goto end_listxattr;
		}

		hfs_bnode_read(fd.bnode, &attr_key,
				fd.keyoffset, key_len + sizeof(key_len));

		if (be32_to_cpu(attr_key.cnid) != inode->i_ino)
			goto end_listxattr;

		xattr_name_len = HFSPLUS_ATTR_MAX_STRLEN;
		if (hfsplus_uni2asc(inode->i_sb,
			(const struct hfsplus_unistr *)&fd.key->attr.key_name,
					strbuf, &xattr_name_len)) {
			printk(KERN_ERR "hfs: unicode conversion failed\n");
			res = -EIO;
			goto end_listxattr;
		}

		if (!buffer || !size) {
			if (can_list(strbuf))
				res += name_len(strbuf, xattr_name_len);
		} else if (can_list(strbuf)) {
			if (size < (res + name_len(strbuf, xattr_name_len))) {
				res = -ERANGE;
				goto end_listxattr;
			} else
				res += copy_name(buffer + res,
						strbuf, xattr_name_len);
		}

		if (hfs_brec_goto(&fd, 1))
			goto end_listxattr;
	}

end_listxattr:
	hfs_find_exit(&fd);
	return res;
}

int hfsplus_removexattr(struct dentry *dentry, const char *name)
{
	int err = 0;
	struct inode *inode = dentry->d_inode;
	struct hfs_find_data cat_fd;
	u16 flags;
	u16 cat_entry_type;
	int is_xattr_acl_deleted = 0;
	int is_all_xattrs_deleted = 0;

	if ((!S_ISREG(inode->i_mode) &&
			!S_ISDIR(inode->i_mode)) ||
				HFSPLUS_IS_RSRC(inode))
		return -EOPNOTSUPP;

	if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
		return -EOPNOTSUPP;

	err = can_set_xattr(inode, name, NULL, 0);
	if (err)
		return err;

	if (strncmp(name, XATTR_MAC_OSX_PREFIX,
				XATTR_MAC_OSX_PREFIX_LEN) == 0)
		name += XATTR_MAC_OSX_PREFIX_LEN;

	if (!strcmp_xattr_finder_info(name))
		return -EOPNOTSUPP;

	err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
	if (err) {
		printk(KERN_ERR "hfs: can't init xattr find struct\n");
		return err;
	}

	err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
	if (err) {
		printk(KERN_ERR "hfs: catalog searching failed\n");
		goto end_removexattr;
	}

	err = hfsplus_delete_attr(inode, name);
	if (err)
		goto end_removexattr;

	is_xattr_acl_deleted = !strcmp_xattr_acl(name);
	is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL);

	if (!is_xattr_acl_deleted && !is_all_xattrs_deleted)
		goto end_removexattr;

	cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);

	if (cat_entry_type == HFSPLUS_FOLDER) {
		flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
				offsetof(struct hfsplus_cat_folder, flags));
		if (is_xattr_acl_deleted)
			flags &= ~HFSPLUS_ACL_EXISTS;
		if (is_all_xattrs_deleted)
			flags &= ~HFSPLUS_XATTR_EXISTS;
		hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
				offsetof(struct hfsplus_cat_folder, flags),
				flags);
		hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
	} else if (cat_entry_type == HFSPLUS_FILE) {
		flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
				offsetof(struct hfsplus_cat_file, flags));
		if (is_xattr_acl_deleted)
			flags &= ~HFSPLUS_ACL_EXISTS;
		if (is_all_xattrs_deleted)
			flags &= ~HFSPLUS_XATTR_EXISTS;
		hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
				offsetof(struct hfsplus_cat_file, flags),
				flags);
		hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
	} else {
		printk(KERN_ERR "hfs: invalid catalog entry type\n");
		err = -EIO;
		goto end_removexattr;
	}

end_removexattr:
	hfs_find_exit(&cat_fd);
	return err;
}

static int hfsplus_osx_getxattr(struct dentry *dentry, const char *name,
					void *buffer, size_t size, int type)
{
	char xattr_name[HFSPLUS_ATTR_MAX_STRLEN +
				XATTR_MAC_OSX_PREFIX_LEN + 1] = {0};
	size_t len = strlen(name);

	if (!strcmp(name, ""))
		return -EINVAL;

	if (len > HFSPLUS_ATTR_MAX_STRLEN)
		return -EOPNOTSUPP;

	strcpy(xattr_name, XATTR_MAC_OSX_PREFIX);
	strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name);

	return hfsplus_getxattr(dentry, xattr_name, buffer, size);
}

static int hfsplus_osx_setxattr(struct dentry *dentry, const char *name,
		const void *buffer, size_t size, int flags, int type)
{
	char xattr_name[HFSPLUS_ATTR_MAX_STRLEN +
				XATTR_MAC_OSX_PREFIX_LEN + 1] = {0};
	size_t len = strlen(name);

	if (!strcmp(name, ""))
		return -EINVAL;

	if (len > HFSPLUS_ATTR_MAX_STRLEN)
		return -EOPNOTSUPP;

	strcpy(xattr_name, XATTR_MAC_OSX_PREFIX);
	strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name);

	return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
}

static size_t hfsplus_osx_listxattr(struct dentry *dentry, char *list,
		size_t list_size, const char *name, size_t name_len, int type)
{
	/*
	 * This method is not used.
	 * It is used hfsplus_listxattr() instead of generic_listxattr().
	 */
	return -EOPNOTSUPP;
}

const struct xattr_handler hfsplus_xattr_osx_handler = {
	.prefix	= XATTR_MAC_OSX_PREFIX,
	.list	= hfsplus_osx_listxattr,
	.get	= hfsplus_osx_getxattr,
	.set	= hfsplus_osx_setxattr,
};
OpenPOWER on IntegriCloud