aboutsummaryrefslogtreecommitdiffstats
path: root/fs/hfs/inode.c
blob: 9a934db0bd8ae927509a9c168ff1ee07cc167562 (plain) (blame)
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
/*
 *  linux/fs/hfs/inode.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 inode-related functions which do not depend on
 * which scheme is being used to represent forks.
 *
 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
 */

#include <linux/pagemap.h>
#include <linux/mpage.h>
#include <linux/sched.h>

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

static const struct file_operations hfs_file_operations;
static const struct inode_operations hfs_file_inode_operations;

/*================ Variable-like macros ================*/

#define HFS_VALID_MODE_BITS  (S_IFREG | S_IFDIR | S_IRWXUGO)

static int hfs_writepage(struct page *page, struct writeback_control *wbc)
{
	return block_write_full_page(page, hfs_get_block, wbc);
}

static int hfs_readpage(struct file *file, struct page *page)
{
	return block_read_full_page(page, hfs_get_block);
}

static int hfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
{
	return cont_prepare_write(page, from, to, hfs_get_block,
				  &HFS_I(page->mapping->host)->phys_size);
}

static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
{
	return generic_block_bmap(mapping, block, hfs_get_block);
}

static int hfs_releasepage(struct page *page, gfp_t mask)
{
	struct inode *inode = page->mapping->host;
	struct super_block *sb = inode->i_sb;
	struct hfs_btree *tree;
	struct hfs_bnode *node;
	u32 nidx;
	int i, res = 1;

	switch (inode->i_ino) {
	case HFS_EXT_CNID:
		tree = HFS_SB(sb)->ext_tree;
		break;
	case HFS_CAT_CNID:
		tree = HFS_SB(sb)->cat_tree;
		break;
	default:
		BUG();
		return 0;
	}
	if (tree->node_size >= PAGE_CACHE_SIZE) {
		nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
		spin_lock(&tree->hash_lock);
		node = hfs_bnode_findhash(tree, nidx);
		if (!node)
			;
		else if (atomic_read(&node->refcnt))
			res = 0;
		if (res && node) {
			hfs_bnode_unhash(node);
			hfs_bnode_free(node);
		}
		spin_unlock(&tree->hash_lock);
	} else {
		nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
		i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
		spin_lock(&tree->hash_lock);
		do {
			node = hfs_bnode_findhash(tree, nidx++);
			if (!node)
				continue;
			if (atomic_read(&node->refcnt)) {
				res = 0;
				break;
			}
			hfs_bnode_unhash(node);
			hfs_bnode_free(node);
		} while (--i && nidx < tree->node_count);
		spin_unlock(&tree->hash_lock);
	}
	return res ? try_to_free_buffers(page) : 0;
}

static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb,
		const struct iovec *iov, loff_t offset, unsigned long nr_segs)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;

	return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
				  offset, nr_segs, hfs_get_block, NULL);
}

static int hfs_writepages(struct address_space *mapping,
			  struct writeback_control *wbc)
{
	return mpage_writepages(mapping, wbc, hfs_get_block);
}

const struct address_space_operations hfs_btree_aops = {
	.readpage	= hfs_readpage,
	.writepage	= hfs_writepage,
	.sync_page	= block_sync_page,
	.prepare_write	= hfs_prepare_write,
	.commit_write	= generic_commit_write,
	.bmap		= hfs_bmap,
	.releasepage	= hfs_releasepage,
};

const struct address_space_operations hfs_aops = {
	.readpage	= hfs_readpage,
	.writepage	= hfs_writepage,
	.sync_page	= block_sync_page,
	.prepare_write	= hfs_prepare_write,
	.commit_write	= generic_commit_write,
	.bmap		= hfs_bmap,
	.direct_IO	= hfs_direct_IO,
	.writepages	= hfs_writepages,
};

/*
 * hfs_new_inode
 */
struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, int mode)
{
	struct super_block *sb = dir->i_sb;
	struct inode *inode = new_inode(sb);
	if (!inode)
		return NULL;

	init_MUTEX(&HFS_I(inode)->extents_lock);
	INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
	hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
	inode->i_ino = HFS_SB(sb)->next_id++;
	inode->i_mode = mode;
	inode->i_uid = current->fsuid;
	inode->i_gid = current->fsgid;
	inode->i_nlink = 1;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
	HFS_I(inode)->flags = 0;
	HFS_I(inode)->rsrc_inode = NULL;
	HFS_I(inode)->fs_blocks = 0;
	if (S_ISDIR(mode)) {
		inode->i_size = 2;
		HFS_SB(sb)->folder_count++;
		if (dir->i_ino == HFS_ROOT_CNID)
			HFS_SB(sb)->root_dirs++;
		inode->i_op = &hfs_dir_inode_operations;
		inode->i_fop = &hfs_dir_operations;
		inode->i_mode |= S_IRWXUGO;
		inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
	} else if (S_ISREG(mode)) {
		HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
		HFS_SB(sb)->file_count++;
		if (dir->i_ino == HFS_ROOT_CNID)
			HFS_SB(sb)->root_files++;
		inode->i_op = &hfs_file_inode_operations;
		inode->i_fop = &hfs_file_operations;
		inode->i_mapping->a_ops = &hfs_aops;
		inode->i_mode |= S_IRUGO|S_IXUGO;
		if (mode & S_IWUSR)
			inode->i_mode |= S_IWUGO;
		inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
		HFS_I(inode)->phys_size = 0;
		HFS_I(inode)->alloc_blocks = 0;
		HFS_I(inode)->first_blocks = 0;
		HFS_I(inode)->cached_start = 0;
		HFS_I(inode)->cached_blocks = 0;
		memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
		memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
	}
	insert_inode_hash(inode);
	mark_inode_dirty(inode);
	set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
	sb->s_dirt = 1;

	return inode;
}

void hfs_delete_inode(struct inode *inode)
{
	struct super_block *sb = inode->i_sb;

	dprint(DBG_INODE, "delete_inode: %lu\n", inode->i_ino);
	if (S_ISDIR(inode->i_mode)) {
		HFS_SB(sb)->folder_count--;
		if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
			HFS_SB(sb)->root_dirs--;
		set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
		sb->s_dirt = 1;
		return;
	}
	HFS_SB(sb)->file_count--;
	if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
		HFS_SB(sb)->root_files--;
	if (S_ISREG(inode->i_mode)) {
		if (!inode->i_nlink) {
			inode->i_size = 0;
			hfs_file_truncate(inode);
		}
	}
	set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
	sb->s_dirt = 1;
}

void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
			 __be32 __log_size, __be32 phys_size, u32 clump_size)
{
	struct super_block *sb = inode->i_sb;
	u32 log_size = be32_to_cpu(__log_size);
	u16 count;
	int i;

	memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
	for (count = 0, i = 0; i < 3; i++)
		count += be16_to_cpu(ext[i].count);
	HFS_I(inode)->first_blocks = count;

	inode->i_size = HFS_I(inode)->phys_size = log_size;
	HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
	inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
	HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
				     HFS_SB(sb)->alloc_blksz;
	HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
	if (!HFS_I(inode)->clump_blocks)
		HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
}

struct hfs_iget_data {
	struct hfs_cat_key *key;
	hfs_cat_rec *rec;
};

static int hfs_test_inode(struct inode *inode, void *data)
{
	struct hfs_iget_data *idata = data;
	hfs_cat_rec *rec;

	rec = idata->rec;
	switch (rec->type) {
	case HFS_CDR_DIR:
		return inode->i_ino == be32_to_cpu(rec->dir.DirID);
	case HFS_CDR_FIL:
		return inode->i_ino == be32_to_cpu(rec->file.FlNum);
	default:
		BUG();
		return 1;
	}
}

/*
 * hfs_read_inode
 */
static int hfs_read_inode(struct inode *inode, void *data)
{
	struct hfs_iget_data *idata = data;
	struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
	hfs_cat_rec *rec;

	HFS_I(inode)->flags = 0;
	HFS_I(inode)->rsrc_inode = NULL;
	init_MUTEX(&HFS_I(inode)->extents_lock);
	INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);

	/* Initialize the inode */
	inode->i_uid = hsb->s_uid;
	inode->i_gid = hsb->s_gid;
	inode->i_nlink = 1;

	if (idata->key)
		HFS_I(inode)->cat_key = *idata->key;
	else
		HFS_I(inode)->flags |= HFS_FLG_RSRC;
	HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;

	rec = idata->rec;
	switch (rec->type) {
	case HFS_CDR_FIL:
		if (!HFS_IS_RSRC(inode)) {
			hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
					    rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
		} else {
			hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
					    rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
		}

		inode->i_ino = be32_to_cpu(rec->file.FlNum);
		inode->i_mode = S_IRUGO | S_IXUGO;
		if (!(rec->file.Flags & HFS_FIL_LOCK))
			inode->i_mode |= S_IWUGO;
		inode->i_mode &= ~hsb->s_file_umask;
		inode->i_mode |= S_IFREG;
		inode->i_ctime = inode->i_atime = inode->i_mtime =
				hfs_m_to_utime(rec->file.MdDat);
		inode->i_op = &hfs_file_inode_operations;
		inode->i_fop = &hfs_file_operations;
		inode->i_mapping->a_ops = &hfs_aops;
		break;
	case HFS_CDR_DIR:
		inode->i_ino = be32_to_cpu(rec->dir.DirID);
		inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
		HFS_I(inode)->fs_blocks = 0;
		inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
		inode->i_ctime = inode->i_atime = inode->i_mtime =
				hfs_m_to_utime(rec->dir.MdDat);
		inode->i_op = &hfs_dir_inode_operations;
		inode->i_fop = &hfs_dir_operations;
		break;
	default:
		make_bad_inode(inode);
	}
	return 0;
}

/*
 * __hfs_iget()
 *
 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
 * the catalog B-tree and the 'type' of the desired file return the
 * inode for that file/directory or NULL.  Note that 'type' indicates
 * whether we want the actual file or directory, or the corresponding
 * metadata (AppleDouble header file or CAP metadata file).
 */
struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
{
	struct hfs_iget_data data = { key, rec };
	struct inode *inode;
	u32 cnid;

	switch (rec->type) {
	case HFS_CDR_DIR:
		cnid = be32_to_cpu(rec->dir.DirID);
		break;
	case HFS_CDR_FIL:
		cnid = be32_to_cpu(rec->file.FlNum);
		break;
	default:
		return NULL;
	}
	inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
	if (inode && (inode->i_state & I_NEW))
		unlock_new_inode(inode);
	return inode;
}

void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
			  __be32 *log_size, __be32 *phys_size)
{
	memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));

	if (log_size)
		*log_size = cpu_to_be32(inode->i_size);
	if (phys_size)
		*phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
					 HFS_SB(inode->i_sb)->alloc_blksz);
}

int hfs_write_inode(struct inode *inode, int unused)
{
	struct inode *main_inode = inode;
	struct hfs_find_data fd;
	hfs_cat_rec rec;

	dprint(DBG_INODE, "hfs_write_inode: %lu\n", inode->i_ino);
	hfs_ext_write_extent(inode);

	if (inode->i_ino < HFS_FIRSTUSER_CNID) {
		switch (inode->i_ino) {
		case HFS_ROOT_CNID:
			break;
		case HFS_EXT_CNID:
			hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
			return 0;
		case HFS_CAT_CNID:
			hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
			return 0;
		default:
			BUG();
			return -EIO;
		}
	}

	if (HFS_IS_RSRC(inode))
		main_inode = HFS_I(inode)->rsrc_inode;

	if (!main_inode->i_nlink)
		return 0;

	if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
		/* panic? */
		return -EIO;

	fd.search_key->cat = HFS_I(main_inode)->cat_key;
	if (hfs_brec_find(&fd))
		/* panic? */
		goto out;

	if (S_ISDIR(main_inode->i_mode)) {
		if (fd.entrylength < sizeof(struct hfs_cat_dir))
			/* panic? */;
		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
			   sizeof(struct hfs_cat_dir));
		if (rec.type != HFS_CDR_DIR ||
		    be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
		}

		rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
		rec.dir.Val = cpu_to_be16(inode->i_size - 2);

		hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
			    sizeof(struct hfs_cat_dir));
	} else if (HFS_IS_RSRC(inode)) {
		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
			       sizeof(struct hfs_cat_file));
		hfs_inode_write_fork(inode, rec.file.RExtRec,
				     &rec.file.RLgLen, &rec.file.RPyLen);
		hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
				sizeof(struct hfs_cat_file));
	} else {
		if (fd.entrylength < sizeof(struct hfs_cat_file))
			/* panic? */;
		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
			   sizeof(struct hfs_cat_file));
		if (rec.type != HFS_CDR_FIL ||
		    be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
		}

		if (inode->i_mode & S_IWUSR)
			rec.file.Flags &= ~HFS_FIL_LOCK;
		else
			rec.file.Flags |= HFS_FIL_LOCK;
		hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
		rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);

		hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
			    sizeof(struct hfs_cat_file));
	}
out:
	hfs_find_exit(&fd);
	return 0;
}

static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
				      struct nameidata *nd)
{
	struct inode *inode = NULL;
	hfs_cat_rec rec;
	struct hfs_find_data fd;
	int res;

	if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
		goto out;

	inode = HFS_I(dir)->rsrc_inode;
	if (inode)
		goto out;

	inode = new_inode(dir->i_sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);

	hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
	fd.search_key->cat = HFS_I(dir)->cat_key;
	res = hfs_brec_read(&fd, &rec, sizeof(rec));
	if (!res) {
		struct hfs_iget_data idata = { NULL, &rec };
		hfs_read_inode(inode, &idata);
	}
	hfs_find_exit(&fd);
	if (res) {
		iput(inode);
		return ERR_PTR(res);
	}
	HFS_I(inode)->rsrc_inode = dir;
	HFS_I(dir)->rsrc_inode = inode;
	igrab(dir);
	hlist_add_head(&inode->i_hash, &HFS_SB(dir->i_sb)->rsrc_inodes);
	mark_inode_dirty(inode);
out:
	d_add(dentry, inode);
	return NULL;
}

void hfs_clear_inode(struct inode *inode)
{
	if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
		HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
		iput(HFS_I(inode)->rsrc_inode);
	}
}

static int hfs_permission(struct inode *inode, int mask,
			  struct nameidata *nd)
{
	if (S_ISREG(inode->i_mode) && mask & MAY_EXEC)
		return 0;
	return generic_permission(inode, mask, NULL);
}

static int hfs_file_open(struct inode *inode, struct file *file)
{
	if (HFS_IS_RSRC(inode))
		inode = HFS_I(inode)->rsrc_inode;
	if (atomic_read(&file->f_count) != 1)
		return 0;
	atomic_inc(&HFS_I(inode)->opencnt);
	return 0;
}

static int hfs_file_release(struct inode *inode, struct file *file)
{
	//struct super_block *sb = inode->i_sb;

	if (HFS_IS_RSRC(inode))
		inode = HFS_I(inode)->rsrc_inode;
	if (atomic_read(&file->f_count) != 0)
		return 0;
	if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
		mutex_lock(&inode->i_mutex);
		hfs_file_truncate(inode);
		//if (inode->i_flags & S_DEAD) {
		//	hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
		//	hfs_delete_inode(inode);
		//}
		mutex_unlock(&inode->i_mutex);
	}
	return 0;
}

/*
 * hfs_notify_change()
 *
 * Based very closely on fs/msdos/inode.c by Werner Almesberger
 *
 * This is the notify_change() field in the super_operations structure
 * for HFS file systems.  The purpose is to take that changes made to
 * an inode and apply then in a filesystem-dependent manner.  In this
 * case the process has a few of tasks to do:
 *  1) prevent changes to the i_uid and i_gid fields.
 *  2) map file permissions to the closest allowable permissions
 *  3) Since multiple Linux files can share the same on-disk inode under
 *     HFS (for instance the data and resource forks of a file) a change
 *     to permissions must be applied to all other in-core inodes which
 *     correspond to the same HFS file.
 */

int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
{
	struct inode *inode = dentry->d_inode;
	struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
	int error;

	error = inode_change_ok(inode, attr); /* basic permission checks */
	if (error)
		return error;

	/* no uig/gid changes and limit which mode bits can be set */
	if (((attr->ia_valid & ATTR_UID) &&
	     (attr->ia_uid != hsb->s_uid)) ||
	    ((attr->ia_valid & ATTR_GID) &&
	     (attr->ia_gid != hsb->s_gid)) ||
	    ((attr->ia_valid & ATTR_MODE) &&
	     ((S_ISDIR(inode->i_mode) &&
	       (attr->ia_mode != inode->i_mode)) ||
	      (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
		return hsb->s_quiet ? 0 : error;
	}

	if (attr->ia_valid & ATTR_MODE) {
		/* Only the 'w' bits can ever change and only all together. */
		if (attr->ia_mode & S_IWUSR)
			attr->ia_mode = inode->i_mode | S_IWUGO;
		else
			attr->ia_mode = inode->i_mode & ~S_IWUGO;
		attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
	}
	error = inode_setattr(inode, attr);
	if (error)
		return error;

	return 0;
}


static const struct file_operations hfs_file_operations = {
	.llseek		= generic_file_llseek,
	.read		= do_sync_read,
	.aio_read	= generic_file_aio_read,
	.write		= do_sync_write,
	.aio_write	= generic_file_aio_write,
	.mmap		= generic_file_mmap,
	.sendfile	= generic_file_sendfile,
	.fsync		= file_fsync,
	.open		= hfs_file_open,
	.release	= hfs_file_release,
};

static const struct inode_operations hfs_file_inode_operations = {
	.lookup		= hfs_file_lookup,
	.truncate	= hfs_file_truncate,
	.setattr	= hfs_inode_setattr,
	.permission	= hfs_permission,
	.setxattr	= hfs_setxattr,
	.getxattr	= hfs_getxattr,
	.listxattr	= hfs_listxattr,
};