aboutsummaryrefslogblamecommitdiffstats
path: root/fs/ufs/dir.c
blob: 1a561202d3f44d33712ebd9e95609a0a436f5e44 (plain) (tree)
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












































































































































































































































































































































































































































































































                                                                                              
                                              































































































































                                                                                           
                                                   



                                           
/*
 *  linux/fs/ufs/ufs_dir.c
 *
 * Copyright (C) 1996
 * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
 * Laboratory for Computer Science Research Computing Facility
 * Rutgers, The State University of New Jersey
 *
 * swab support by Francois-Rene Rideau <fare@tunes.org> 19970406
 *
 * 4.4BSD (FreeBSD) support added on February 1st 1998 by
 * Niels Kristian Bech Jensen <nkbj@image.dk> partially based
 * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.
 */

#include <linux/time.h>
#include <linux/fs.h>
#include <linux/ufs_fs.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/sched.h>

#include "swab.h"
#include "util.h"

#undef UFS_DIR_DEBUG

#ifdef UFS_DIR_DEBUG
#define UFSD(x) printk("(%s, %d), %s: ", __FILE__, __LINE__, __FUNCTION__); printk x;
#else
#define UFSD(x)
#endif

static int
ufs_check_dir_entry (const char *, struct inode *, struct ufs_dir_entry *,
		     struct buffer_head *, unsigned long);


/*
 * NOTE! unlike strncmp, ufs_match returns 1 for success, 0 for failure.
 *
 * len <= UFS_MAXNAMLEN and de != NULL are guaranteed by caller.
 */
static inline int ufs_match(struct super_block *sb, int len,
		const char * const name, struct ufs_dir_entry * de)
{
	if (len != ufs_get_de_namlen(sb, de))
		return 0;
	if (!de->d_ino)
		return 0;
	return !memcmp(name, de->d_name, len);
}

/*
 * This is blatantly stolen from ext2fs
 */
static int
ufs_readdir (struct file * filp, void * dirent, filldir_t filldir)
{
	struct inode *inode = filp->f_dentry->d_inode;
	int error = 0;
	unsigned long offset, lblk;
	int i, stored;
	struct buffer_head * bh;
	struct ufs_dir_entry * de;
	struct super_block * sb;
	int de_reclen;
	unsigned flags;
	u64     blk= 0L;

	lock_kernel();

	sb = inode->i_sb;
	flags = UFS_SB(sb)->s_flags;

	UFSD(("ENTER, ino %lu  f_pos %lu\n", inode->i_ino, (unsigned long) filp->f_pos))

	stored = 0;
	bh = NULL;
	offset = filp->f_pos & (sb->s_blocksize - 1);

	while (!error && !stored && filp->f_pos < inode->i_size) {
		lblk = (filp->f_pos) >> sb->s_blocksize_bits;
		blk = ufs_frag_map(inode, lblk);
		if (!blk || !(bh = sb_bread(sb, blk))) {
			/* XXX - error - skip to the next block */
			printk("ufs_readdir: "
			       "dir inode %lu has a hole at offset %lu\n",
			       inode->i_ino, (unsigned long int)filp->f_pos);
			filp->f_pos += sb->s_blocksize - offset;
			continue;
		}

revalidate:
		/* If the dir block has changed since the last call to
		 * readdir(2), then we might be pointing to an invalid
		 * dirent right now.  Scan from the start of the block
		 * to make sure. */
		if (filp->f_version != inode->i_version) {
			for (i = 0; i < sb->s_blocksize && i < offset; ) {
				de = (struct ufs_dir_entry *)(bh->b_data + i);
				/* It's too expensive to do a full
				 * dirent test each time round this
				 * loop, but we do have to test at
				 * least that it is non-zero.  A
				 * failure will be detected in the
				 * dirent test below. */
				de_reclen = fs16_to_cpu(sb, de->d_reclen);
				if (de_reclen < 1)
					break;
				i += de_reclen;
			}
			offset = i;
			filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1))
				| offset;
			filp->f_version = inode->i_version;
		}

		while (!error && filp->f_pos < inode->i_size
		       && offset < sb->s_blocksize) {
			de = (struct ufs_dir_entry *) (bh->b_data + offset);
			/* XXX - put in a real ufs_check_dir_entry() */
			if ((de->d_reclen == 0) || (ufs_get_de_namlen(sb, de) == 0)) {
				filp->f_pos = (filp->f_pos &
				              (sb->s_blocksize - 1)) +
				               sb->s_blocksize;
				brelse(bh);
				unlock_kernel();
				return stored;
			}
			if (!ufs_check_dir_entry ("ufs_readdir", inode, de,
						   bh, offset)) {
				/* On error, skip the f_pos to the
				   next block. */
				filp->f_pos = (filp->f_pos |
				              (sb->s_blocksize - 1)) +
					       1;
				brelse (bh);
				unlock_kernel();
				return stored;
			}
			offset += fs16_to_cpu(sb, de->d_reclen);
			if (de->d_ino) {
				/* We might block in the next section
				 * if the data destination is
				 * currently swapped out.  So, use a
				 * version stamp to detect whether or
				 * not the directory has been modified
				 * during the copy operation. */
				unsigned long version = filp->f_version;
				unsigned char d_type = DT_UNKNOWN;

				UFSD(("filldir(%s,%u)\n", de->d_name,
							fs32_to_cpu(sb, de->d_ino)))
				UFSD(("namlen %u\n", ufs_get_de_namlen(sb, de)))

				if ((flags & UFS_DE_MASK) == UFS_DE_44BSD)
					d_type = de->d_u.d_44.d_type;
				error = filldir(dirent, de->d_name,
						ufs_get_de_namlen(sb, de), filp->f_pos,
						fs32_to_cpu(sb, de->d_ino), d_type);
				if (error)
					break;
				if (version != filp->f_version)
					goto revalidate;
				stored ++;
			}
			filp->f_pos += fs16_to_cpu(sb, de->d_reclen);
		}
		offset = 0;
		brelse (bh);
	}
	unlock_kernel();
	return 0;
}

/*
 * define how far ahead to read directories while searching them.
 */
#define NAMEI_RA_CHUNKS  2
#define NAMEI_RA_BLOCKS  4
#define NAMEI_RA_SIZE        (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
#define NAMEI_RA_INDEX(c,b)  (((c) * NAMEI_RA_BLOCKS) + (b))

/*
 *	ufs_find_entry()
 *
 * finds an entry in the specified directory with the wanted name. It
 * returns the cache buffer in which the entry was found, and the entry
 * itself (as a parameter - res_bh). It does NOT read the inode of the
 * entry - you'll have to do that yourself if you want to.
 */
struct ufs_dir_entry * ufs_find_entry (struct dentry *dentry,
	struct buffer_head ** res_bh)
{
	struct super_block * sb;
	struct buffer_head * bh_use[NAMEI_RA_SIZE];
	struct buffer_head * bh_read[NAMEI_RA_SIZE];
	unsigned long offset;
	int block, toread, i, err;
	struct inode *dir = dentry->d_parent->d_inode;
	const char *name = dentry->d_name.name;
	int namelen = dentry->d_name.len;

	UFSD(("ENTER, dir_ino %lu, name %s, namlen %u\n", dir->i_ino, name, namelen))
	
	*res_bh = NULL;
	
	sb = dir->i_sb;
	
	if (namelen > UFS_MAXNAMLEN)
		return NULL;

	memset (bh_use, 0, sizeof (bh_use));
	toread = 0;
	for (block = 0; block < NAMEI_RA_SIZE; ++block) {
		struct buffer_head * bh;

		if ((block << sb->s_blocksize_bits) >= dir->i_size)
			break;
		bh = ufs_getfrag (dir, block, 0, &err);
		bh_use[block] = bh;
		if (bh && !buffer_uptodate(bh))
			bh_read[toread++] = bh;
	}

	for (block = 0, offset = 0; offset < dir->i_size; block++) {
		struct buffer_head * bh;
		struct ufs_dir_entry * de;
		char * dlimit;

		if ((block % NAMEI_RA_BLOCKS) == 0 && toread) {
			ll_rw_block (READ, toread, bh_read);
			toread = 0;
		}
		bh = bh_use[block % NAMEI_RA_SIZE];
		if (!bh) {
			ufs_error (sb, "ufs_find_entry", 
				"directory #%lu contains a hole at offset %lu",
				dir->i_ino, offset);
			offset += sb->s_blocksize;
			continue;
		}
		wait_on_buffer (bh);
		if (!buffer_uptodate(bh)) {
			/*
			 * read error: all bets are off
			 */
			break;
		}

		de = (struct ufs_dir_entry *) bh->b_data;
		dlimit = bh->b_data + sb->s_blocksize;
		while ((char *) de < dlimit && offset < dir->i_size) {
			/* this code is executed quadratically often */
			/* do minimal checking by hand */
			int de_len;

			if ((char *) de + namelen <= dlimit &&
			    ufs_match(sb, namelen, name, de)) {
				/* found a match -
				just to be sure, do a full check */
				if (!ufs_check_dir_entry("ufs_find_entry",
				    dir, de, bh, offset))
					goto failed;
				for (i = 0; i < NAMEI_RA_SIZE; ++i) {
					if (bh_use[i] != bh)
						brelse (bh_use[i]);
				}
				*res_bh = bh;
				return de;
			}
                        /* prevent looping on a bad block */
			de_len = fs16_to_cpu(sb, de->d_reclen);
			if (de_len <= 0)
				goto failed;
			offset += de_len;
			de = (struct ufs_dir_entry *) ((char *) de + de_len);
		}

		brelse (bh);
		if (((block + NAMEI_RA_SIZE) << sb->s_blocksize_bits ) >=
		    dir->i_size)
			bh = NULL;
		else
			bh = ufs_getfrag (dir, block + NAMEI_RA_SIZE, 0, &err);
		bh_use[block % NAMEI_RA_SIZE] = bh;
		if (bh && !buffer_uptodate(bh))
			bh_read[toread++] = bh;
	}

failed:
	for (i = 0; i < NAMEI_RA_SIZE; ++i) brelse (bh_use[i]);
	UFSD(("EXIT\n"))
	return NULL;
}

static int
ufs_check_dir_entry (const char *function, struct inode *dir,
		     struct ufs_dir_entry *de, struct buffer_head *bh,
		     unsigned long offset)
{
	struct super_block *sb = dir->i_sb;
	const char *error_msg = NULL;
	int rlen = fs16_to_cpu(sb, de->d_reclen);

	if (rlen < UFS_DIR_REC_LEN(1))
		error_msg = "reclen is smaller than minimal";
	else if (rlen % 4 != 0)
		error_msg = "reclen % 4 != 0";
	else if (rlen < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de)))
		error_msg = "reclen is too small for namlen";
	else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
		error_msg = "directory entry across blocks";
	else if (fs32_to_cpu(sb, de->d_ino) > (UFS_SB(sb)->s_uspi->s_ipg *
				      UFS_SB(sb)->s_uspi->s_ncg))
		error_msg = "inode out of bounds";

	if (error_msg != NULL)
		ufs_error (sb, function, "bad entry in directory #%lu, size %Lu: %s - "
			    "offset=%lu, inode=%lu, reclen=%d, namlen=%d",
			    dir->i_ino, dir->i_size, error_msg, offset,
			    (unsigned long)fs32_to_cpu(sb, de->d_ino),
			    rlen, ufs_get_de_namlen(sb, de));
	
	return (error_msg == NULL ? 1 : 0);
}

struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct buffer_head **p)
{
	int err;
	struct buffer_head *bh = ufs_bread (dir, 0, 0, &err);
	struct ufs_dir_entry *res = NULL;

	if (bh) {
		res = (struct ufs_dir_entry *) bh->b_data;
		res = (struct ufs_dir_entry *)((char *)res +
			fs16_to_cpu(dir->i_sb, res->d_reclen));
	}
	*p = bh;
	return res;
}
ino_t ufs_inode_by_name(struct inode * dir, struct dentry *dentry)
{
	ino_t res = 0;
	struct ufs_dir_entry * de;
	struct buffer_head *bh;

	de = ufs_find_entry (dentry, &bh);
	if (de) {
		res = fs32_to_cpu(dir->i_sb, de->d_ino);
		brelse(bh);
	}
	return res;
}

void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
		struct buffer_head *bh, struct inode *inode)
{
	dir->i_version++;
	de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
	mark_buffer_dirty(bh);
	if (IS_DIRSYNC(dir))
		sync_dirty_buffer(bh);
	brelse (bh);
}

/*
 *	ufs_add_entry()
 *
 * adds a file entry to the specified directory, using the same
 * semantics as ufs_find_entry(). It returns NULL if it failed.
 */
int ufs_add_link(struct dentry *dentry, struct inode *inode)
{
	struct super_block * sb;
	struct ufs_sb_private_info * uspi;
	unsigned long offset;
	unsigned fragoff;
	unsigned short rec_len;
	struct buffer_head * bh;
	struct ufs_dir_entry * de, * de1;
	struct inode *dir = dentry->d_parent->d_inode;
	const char *name = dentry->d_name.name;
	int namelen = dentry->d_name.len;
	int err;

	UFSD(("ENTER, name %s, namelen %u\n", name, namelen))
	
	sb = dir->i_sb;
	uspi = UFS_SB(sb)->s_uspi;

	if (!namelen)
		return -EINVAL;
	bh = ufs_bread (dir, 0, 0, &err);
	if (!bh)
		return err;
	rec_len = UFS_DIR_REC_LEN(namelen);
	offset = 0;
	de = (struct ufs_dir_entry *) bh->b_data;
	while (1) {
		if ((char *)de >= UFS_SECTOR_SIZE + bh->b_data) {
			fragoff = offset & ~uspi->s_fmask;
			if (fragoff != 0 && fragoff != UFS_SECTOR_SIZE)
				ufs_error (sb, "ufs_add_entry", "internal error"
					" fragoff %u", fragoff);
			if (!fragoff) {
				brelse (bh);
				bh = ufs_bread (dir, offset >> sb->s_blocksize_bits, 1, &err);
				if (!bh)
					return err;
			}
			if (dir->i_size <= offset) {
				if (dir->i_size == 0) {
					brelse(bh);
					return -ENOENT;
				}
				de = (struct ufs_dir_entry *) (bh->b_data + fragoff);
				de->d_ino = 0;
				de->d_reclen = cpu_to_fs16(sb, UFS_SECTOR_SIZE);
				ufs_set_de_namlen(sb, de, 0);
				dir->i_size = offset + UFS_SECTOR_SIZE;
				mark_inode_dirty(dir);
			} else {
				de = (struct ufs_dir_entry *) bh->b_data;
			}
		}
		if (!ufs_check_dir_entry ("ufs_add_entry", dir, de, bh, offset)) {
			brelse (bh);
			return -ENOENT;
		}
		if (ufs_match(sb, namelen, name, de)) {
			brelse (bh);
			return -EEXIST;
		}
		if (de->d_ino == 0 && fs16_to_cpu(sb, de->d_reclen) >= rec_len)
			break;
			
		if (fs16_to_cpu(sb, de->d_reclen) >=
		     UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de)) + rec_len)
			break;
		offset += fs16_to_cpu(sb, de->d_reclen);
		de = (struct ufs_dir_entry *) ((char *) de + fs16_to_cpu(sb, de->d_reclen));
	}

	if (de->d_ino) {
		de1 = (struct ufs_dir_entry *) ((char *) de +
			UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de)));
		de1->d_reclen =
			cpu_to_fs16(sb, fs16_to_cpu(sb, de->d_reclen) -
				UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de)));
		de->d_reclen =
			cpu_to_fs16(sb, UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de)));
		de = de1;
	}
	de->d_ino = 0;
	ufs_set_de_namlen(sb, de, namelen);
	memcpy (de->d_name, name, namelen + 1);
	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
	ufs_set_de_type(sb, de, inode->i_mode);
	mark_buffer_dirty(bh);
	if (IS_DIRSYNC(dir))
		sync_dirty_buffer(bh);
	brelse (bh);
	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
	dir->i_version++;
	mark_inode_dirty(dir);

	UFSD(("EXIT\n"))
	return 0;
}

/*
 * ufs_delete_entry deletes a directory entry by merging it with the
 * previous entry.
 */
int ufs_delete_entry (struct inode * inode, struct ufs_dir_entry * dir,
	struct buffer_head * bh )
	
{
	struct super_block * sb;
	struct ufs_dir_entry * de, * pde;
	unsigned i;
	
	UFSD(("ENTER\n"))

	sb = inode->i_sb;
	i = 0;
	pde = NULL;
	de = (struct ufs_dir_entry *) bh->b_data;
	
	UFSD(("ino %u, reclen %u, namlen %u, name %s\n",
		fs32_to_cpu(sb, de->d_ino),
		fs16_to_cpu(sb, de->d_reclen),
		ufs_get_de_namlen(sb, de), de->d_name))

	while (i < bh->b_size) {
		if (!ufs_check_dir_entry ("ufs_delete_entry", inode, de, bh, i)) {
			brelse(bh);
			return -EIO;
		}
		if (de == dir)  {
			if (pde)
				fs16_add(sb, &pde->d_reclen,
					fs16_to_cpu(sb, dir->d_reclen));
			dir->d_ino = 0;
			inode->i_version++;
			inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
			mark_inode_dirty(inode);
			mark_buffer_dirty(bh);
			if (IS_DIRSYNC(inode))
				sync_dirty_buffer(bh);
			brelse(bh);
			UFSD(("EXIT\n"))
			return 0;
		}
		i += fs16_to_cpu(sb, de->d_reclen);
		if (i == UFS_SECTOR_SIZE) pde = NULL;
		else pde = de;
		de = (struct ufs_dir_entry *)
		    ((char *) de + fs16_to_cpu(sb, de->d_reclen));
		if (i == UFS_SECTOR_SIZE && de->d_reclen == 0)
			break;
	}
	UFSD(("EXIT\n"))
	brelse(bh);
	return -ENOENT;
}

int ufs_make_empty(struct inode * inode, struct inode *dir)
{
	struct super_block * sb = dir->i_sb;
	struct buffer_head * dir_block;
	struct ufs_dir_entry * de;
	int err;

	dir_block = ufs_bread (inode, 0, 1, &err);
	if (!dir_block)
		return err;

	inode->i_blocks = sb->s_blocksize / UFS_SECTOR_SIZE;
	de = (struct ufs_dir_entry *) dir_block->b_data;
	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
	ufs_set_de_type(sb, de, inode->i_mode);
	ufs_set_de_namlen(sb, de, 1);
	de->d_reclen = cpu_to_fs16(sb, UFS_DIR_REC_LEN(1));
	strcpy (de->d_name, ".");
	de = (struct ufs_dir_entry *)
		((char *)de + fs16_to_cpu(sb, de->d_reclen));
	de->d_ino = cpu_to_fs32(sb, dir->i_ino);
	ufs_set_de_type(sb, de, dir->i_mode);
	de->d_reclen = cpu_to_fs16(sb, UFS_SECTOR_SIZE - UFS_DIR_REC_LEN(1));
	ufs_set_de_namlen(sb, de, 2);
	strcpy (de->d_name, "..");
	mark_buffer_dirty(dir_block);
	brelse (dir_block);
	mark_inode_dirty(inode);
	return 0;
}

/*
 * routine to check that the specified directory is empty (for rmdir)
 */
int ufs_empty_dir (struct inode * inode)
{
	struct super_block * sb;
	unsigned long offset;
	struct buffer_head * bh;
	struct ufs_dir_entry * de, * de1;
	int err;
	
	sb = inode->i_sb;

	if (inode->i_size < UFS_DIR_REC_LEN(1) + UFS_DIR_REC_LEN(2) ||
	    !(bh = ufs_bread (inode, 0, 0, &err))) {
	    	ufs_warning (inode->i_sb, "empty_dir",
			      "bad directory (dir #%lu) - no data block",
			      inode->i_ino);
		return 1;
	}
	de = (struct ufs_dir_entry *) bh->b_data;
	de1 = (struct ufs_dir_entry *)
		((char *)de + fs16_to_cpu(sb, de->d_reclen));
	if (fs32_to_cpu(sb, de->d_ino) != inode->i_ino || de1->d_ino == 0 ||
	     strcmp (".", de->d_name) || strcmp ("..", de1->d_name)) {
	    	ufs_warning (inode->i_sb, "empty_dir",
			      "bad directory (dir #%lu) - no `.' or `..'",
			      inode->i_ino);
		return 1;
	}
	offset = fs16_to_cpu(sb, de->d_reclen) + fs16_to_cpu(sb, de1->d_reclen);
	de = (struct ufs_dir_entry *)
		((char *)de1 + fs16_to_cpu(sb, de1->d_reclen));
	while (offset < inode->i_size ) {
		if (!bh || (void *) de >= (void *) (bh->b_data + sb->s_blocksize)) {
			brelse (bh);
			bh = ufs_bread (inode, offset >> sb->s_blocksize_bits, 1, &err);
	 		if (!bh) {
				ufs_error (sb, "empty_dir",
					    "directory #%lu contains a hole at offset %lu",
					    inode->i_ino, offset);
				offset += sb->s_blocksize;
				continue;
			}
			de = (struct ufs_dir_entry *) bh->b_data;
		}
		if (!ufs_check_dir_entry ("empty_dir", inode, de, bh, offset)) {
			brelse (bh);
			return 1;
		}
		if (de->d_ino) {
			brelse (bh);
			return 0;
		}
		offset += fs16_to_cpu(sb, de->d_reclen);
		de = (struct ufs_dir_entry *)
			((char *)de + fs16_to_cpu(sb, de->d_reclen));
	}
	brelse (bh);
	return 1;
}

const struct file_operations ufs_dir_operations = {
	.read		= generic_read_dir,
	.readdir	= ufs_readdir,
	.fsync		= file_fsync,
};