xref: /linux/fs/ufs/dir.c (revision 14b42963f64b98ab61fa9723c03d71aa5ef4f862) 
1 /*
2  *  linux/fs/ufs/ufs_dir.c
3  *
4  * Copyright (C) 1996
5  * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
6  * Laboratory for Computer Science Research Computing Facility
7  * Rutgers, The State University of New Jersey
8  *
9  * swab support by Francois-Rene Rideau <fare@tunes.org> 19970406
10  *
11  * 4.4BSD (FreeBSD) support added on February 1st 1998 by
12  * Niels Kristian Bech Jensen <nkbj@image.dk> partially based
13  * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.
14  *
15  * Migration to usage of "page cache" on May 2006 by
16  * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
17  */
18 
19 #include <linux/time.h>
20 #include <linux/fs.h>
21 #include <linux/ufs_fs.h>
22 #include <linux/smp_lock.h>
23 #include <linux/sched.h>
24 
25 #include "swab.h"
26 #include "util.h"
27 
28 /*
29  * NOTE! unlike strncmp, ufs_match returns 1 for success, 0 for failure.
30  *
31  * len <= UFS_MAXNAMLEN and de != NULL are guaranteed by caller.
32  */
33 static inline int ufs_match(struct super_block *sb, int len,
34 		const char * const name, struct ufs_dir_entry * de)
35 {
36 	if (len != ufs_get_de_namlen(sb, de))
37 		return 0;
38 	if (!de->d_ino)
39 		return 0;
40 	return !memcmp(name, de->d_name, len);
41 }
42 
43 static int ufs_commit_chunk(struct page *page, unsigned from, unsigned to)
44 {
45 	struct inode *dir = page->mapping->host;
46 	int err = 0;
47 	dir->i_version++;
48 	page->mapping->a_ops->commit_write(NULL, page, from, to);
49 	if (IS_DIRSYNC(dir))
50 		err = write_one_page(page, 1);
51 	else
52 		unlock_page(page);
53 	return err;
54 }
55 
56 static inline void ufs_put_page(struct page *page)
57 {
58 	kunmap(page);
59 	page_cache_release(page);
60 }
61 
62 static inline unsigned long ufs_dir_pages(struct inode *inode)
63 {
64 	return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
65 }
66 
67 ino_t ufs_inode_by_name(struct inode *dir, struct dentry *dentry)
68 {
69 	ino_t res = 0;
70 	struct ufs_dir_entry *de;
71 	struct page *page;
72 
73 	de = ufs_find_entry(dir, dentry, &page);
74 	if (de) {
75 		res = fs32_to_cpu(dir->i_sb, de->d_ino);
76 		ufs_put_page(page);
77 	}
78 	return res;
79 }
80 
81 
82 /* Releases the page */
83 void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
84 		  struct page *page, struct inode *inode)
85 {
86 	unsigned from = (char *) de - (char *) page_address(page);
87 	unsigned to = from + fs16_to_cpu(dir->i_sb, de->d_reclen);
88 	int err;
89 
90 	lock_page(page);
91 	err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
92 	BUG_ON(err);
93 	de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
94 	ufs_set_de_type(dir->i_sb, de, inode->i_mode);
95 	err = ufs_commit_chunk(page, from, to);
96 	ufs_put_page(page);
97 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
98 	mark_inode_dirty(dir);
99 }
100 
101 
102 static void ufs_check_page(struct page *page)
103 {
104 	struct inode *dir = page->mapping->host;
105 	struct super_block *sb = dir->i_sb;
106 	char *kaddr = page_address(page);
107 	unsigned offs, rec_len;
108 	unsigned limit = PAGE_CACHE_SIZE;
109 	struct ufs_dir_entry *p;
110 	char *error;
111 
112 	if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
113 		limit = dir->i_size & ~PAGE_CACHE_MASK;
114 		if (limit & (UFS_SECTOR_SIZE - 1))
115 			goto Ebadsize;
116 		if (!limit)
117 			goto out;
118 	}
119 	for (offs = 0; offs <= limit - UFS_DIR_REC_LEN(1); offs += rec_len) {
120 		p = (struct ufs_dir_entry *)(kaddr + offs);
121 		rec_len = fs16_to_cpu(sb, p->d_reclen);
122 
123 		if (rec_len < UFS_DIR_REC_LEN(1))
124 			goto Eshort;
125 		if (rec_len & 3)
126 			goto Ealign;
127 		if (rec_len < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, p)))
128 			goto Enamelen;
129 		if (((offs + rec_len - 1) ^ offs) & ~(UFS_SECTOR_SIZE-1))
130 			goto Espan;
131 		if (fs32_to_cpu(sb, p->d_ino) > (UFS_SB(sb)->s_uspi->s_ipg *
132 						  UFS_SB(sb)->s_uspi->s_ncg))
133 			goto Einumber;
134 	}
135 	if (offs != limit)
136 		goto Eend;
137 out:
138 	SetPageChecked(page);
139 	return;
140 
141 	/* Too bad, we had an error */
142 
143 Ebadsize:
144 	ufs_error(sb, "ufs_check_page",
145 		  "size of directory #%lu is not a multiple of chunk size",
146 		  dir->i_ino
147 	);
148 	goto fail;
149 Eshort:
150 	error = "rec_len is smaller than minimal";
151 	goto bad_entry;
152 Ealign:
153 	error = "unaligned directory entry";
154 	goto bad_entry;
155 Enamelen:
156 	error = "rec_len is too small for name_len";
157 	goto bad_entry;
158 Espan:
159 	error = "directory entry across blocks";
160 	goto bad_entry;
161 Einumber:
162 	error = "inode out of bounds";
163 bad_entry:
164 	ufs_error (sb, "ufs_check_page", "bad entry in directory #%lu: %s - "
165 		   "offset=%lu, rec_len=%d, name_len=%d",
166 		   dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
167 		   rec_len, ufs_get_de_namlen(sb, p));
168 	goto fail;
169 Eend:
170 	p = (struct ufs_dir_entry *)(kaddr + offs);
171 	ufs_error (sb, "ext2_check_page",
172 		   "entry in directory #%lu spans the page boundary"
173 		   "offset=%lu",
174 		   dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs);
175 fail:
176 	SetPageChecked(page);
177 	SetPageError(page);
178 }
179 
180 static struct page *ufs_get_page(struct inode *dir, unsigned long n)
181 {
182 	struct address_space *mapping = dir->i_mapping;
183 	struct page *page = read_cache_page(mapping, n,
184 				(filler_t*)mapping->a_ops->readpage, NULL);
185 	if (!IS_ERR(page)) {
186 		wait_on_page_locked(page);
187 		kmap(page);
188 		if (!PageUptodate(page))
189 			goto fail;
190 		if (!PageChecked(page))
191 			ufs_check_page(page);
192 		if (PageError(page))
193 			goto fail;
194 	}
195 	return page;
196 
197 fail:
198 	ufs_put_page(page);
199 	return ERR_PTR(-EIO);
200 }
201 
202 /*
203  * Return the offset into page `page_nr' of the last valid
204  * byte in that page, plus one.
205  */
206 static unsigned
207 ufs_last_byte(struct inode *inode, unsigned long page_nr)
208 {
209 	unsigned last_byte = inode->i_size;
210 
211 	last_byte -= page_nr << PAGE_CACHE_SHIFT;
212 	if (last_byte > PAGE_CACHE_SIZE)
213 		last_byte = PAGE_CACHE_SIZE;
214 	return last_byte;
215 }
216 
217 static inline struct ufs_dir_entry *
218 ufs_next_entry(struct super_block *sb, struct ufs_dir_entry *p)
219 {
220 	return (struct ufs_dir_entry *)((char *)p +
221 					fs16_to_cpu(sb, p->d_reclen));
222 }
223 
224 struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p)
225 {
226 	struct page *page = ufs_get_page(dir, 0);
227 	struct ufs_dir_entry *de = NULL;
228 
229 	if (!IS_ERR(page)) {
230 		de = ufs_next_entry(dir->i_sb,
231 				    (struct ufs_dir_entry *)page_address(page));
232 		*p = page;
233 	}
234 	return de;
235 }
236 
237 /*
238  *	ufs_find_entry()
239  *
240  * finds an entry in the specified directory with the wanted name. It
241  * returns the page in which the entry was found, and the entry itself
242  * (as a parameter - res_dir). Page is returned mapped and unlocked.
243  * Entry is guaranteed to be valid.
244  */
245 struct ufs_dir_entry *ufs_find_entry(struct inode *dir, struct dentry *dentry,
246 				     struct page **res_page)
247 {
248 	struct super_block *sb = dir->i_sb;
249 	const char *name = dentry->d_name.name;
250 	int namelen = dentry->d_name.len;
251 	unsigned reclen = UFS_DIR_REC_LEN(namelen);
252 	unsigned long start, n;
253 	unsigned long npages = ufs_dir_pages(dir);
254 	struct page *page = NULL;
255 	struct ufs_inode_info *ui = UFS_I(dir);
256 	struct ufs_dir_entry *de;
257 
258 	UFSD("ENTER, dir_ino %lu, name %s, namlen %u\n", dir->i_ino, name, namelen);
259 
260 	if (npages == 0 || namelen > UFS_MAXNAMLEN)
261 		goto out;
262 
263 	/* OFFSET_CACHE */
264 	*res_page = NULL;
265 
266 	start = ui->i_dir_start_lookup;
267 
268 	if (start >= npages)
269 		start = 0;
270 	n = start;
271 	do {
272 		char *kaddr;
273 		page = ufs_get_page(dir, n);
274 		if (!IS_ERR(page)) {
275 			kaddr = page_address(page);
276 			de = (struct ufs_dir_entry *) kaddr;
277 			kaddr += ufs_last_byte(dir, n) - reclen;
278 			while ((char *) de <= kaddr) {
279 				if (de->d_reclen == 0) {
280 					ufs_error(dir->i_sb, __FUNCTION__,
281 						  "zero-length directory entry");
282 					ufs_put_page(page);
283 					goto out;
284 				}
285 				if (ufs_match(sb, namelen, name, de))
286 					goto found;
287 				de = ufs_next_entry(sb, de);
288 			}
289 			ufs_put_page(page);
290 		}
291 		if (++n >= npages)
292 			n = 0;
293 	} while (n != start);
294 out:
295 	return NULL;
296 
297 found:
298 	*res_page = page;
299 	ui->i_dir_start_lookup = n;
300 	return de;
301 }
302 
303 /*
304  *	Parent is locked.
305  */
306 int ufs_add_link(struct dentry *dentry, struct inode *inode)
307 {
308 	struct inode *dir = dentry->d_parent->d_inode;
309 	const char *name = dentry->d_name.name;
310 	int namelen = dentry->d_name.len;
311 	struct super_block *sb = dir->i_sb;
312 	unsigned reclen = UFS_DIR_REC_LEN(namelen);
313 	unsigned short rec_len, name_len;
314 	struct page *page = NULL;
315 	struct ufs_dir_entry *de;
316 	unsigned long npages = ufs_dir_pages(dir);
317 	unsigned long n;
318 	char *kaddr;
319 	unsigned from, to;
320 	int err;
321 
322 	UFSD("ENTER, name %s, namelen %u\n", name, namelen);
323 
324 	/*
325 	 * We take care of directory expansion in the same loop.
326 	 * This code plays outside i_size, so it locks the page
327 	 * to protect that region.
328 	 */
329 	for (n = 0; n <= npages; n++) {
330 		char *dir_end;
331 
332 		page = ufs_get_page(dir, n);
333 		err = PTR_ERR(page);
334 		if (IS_ERR(page))
335 			goto out;
336 		lock_page(page);
337 		kaddr = page_address(page);
338 		dir_end = kaddr + ufs_last_byte(dir, n);
339 		de = (struct ufs_dir_entry *)kaddr;
340 		kaddr += PAGE_CACHE_SIZE - reclen;
341 		while ((char *)de <= kaddr) {
342 			if ((char *)de == dir_end) {
343 				/* We hit i_size */
344 				name_len = 0;
345 				rec_len = UFS_SECTOR_SIZE;
346 				de->d_reclen = cpu_to_fs16(sb, UFS_SECTOR_SIZE);
347 				de->d_ino = 0;
348 				goto got_it;
349 			}
350 			if (de->d_reclen == 0) {
351 				ufs_error(dir->i_sb, __FUNCTION__,
352 					  "zero-length directory entry");
353 				err = -EIO;
354 				goto out_unlock;
355 			}
356 			err = -EEXIST;
357 			if (ufs_match(sb, namelen, name, de))
358 				goto out_unlock;
359 			name_len = UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de));
360 			rec_len = fs16_to_cpu(sb, de->d_reclen);
361 			if (!de->d_ino && rec_len >= reclen)
362 				goto got_it;
363 			if (rec_len >= name_len + reclen)
364 				goto got_it;
365 			de = (struct ufs_dir_entry *) ((char *) de + rec_len);
366 		}
367 		unlock_page(page);
368 		ufs_put_page(page);
369 	}
370 	BUG();
371 	return -EINVAL;
372 
373 got_it:
374 	from = (char*)de - (char*)page_address(page);
375 	to = from + rec_len;
376 	err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
377 	if (err)
378 		goto out_unlock;
379 	if (de->d_ino) {
380 		struct ufs_dir_entry *de1 =
381 			(struct ufs_dir_entry *) ((char *) de + name_len);
382 		de1->d_reclen = cpu_to_fs16(sb, rec_len - name_len);
383 		de->d_reclen = cpu_to_fs16(sb, name_len);
384 
385 		de = de1;
386 	}
387 
388 	ufs_set_de_namlen(sb, de, namelen);
389 	memcpy(de->d_name, name, namelen + 1);
390 	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
391 	ufs_set_de_type(sb, de, inode->i_mode);
392 
393 	err = ufs_commit_chunk(page, from, to);
394 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
395 
396 	mark_inode_dirty(dir);
397 	/* OFFSET_CACHE */
398 out_put:
399 	ufs_put_page(page);
400 out:
401 	return err;
402 out_unlock:
403 	unlock_page(page);
404 	goto out_put;
405 }
406 
407 static inline unsigned
408 ufs_validate_entry(struct super_block *sb, char *base,
409 		   unsigned offset, unsigned mask)
410 {
411 	struct ufs_dir_entry *de = (struct ufs_dir_entry*)(base + offset);
412 	struct ufs_dir_entry *p = (struct ufs_dir_entry*)(base + (offset&mask));
413 	while ((char*)p < (char*)de) {
414 		if (p->d_reclen == 0)
415 			break;
416 		p = ufs_next_entry(sb, p);
417 	}
418 	return (char *)p - base;
419 }
420 
421 
422 /*
423  * This is blatantly stolen from ext2fs
424  */
425 static int
426 ufs_readdir(struct file *filp, void *dirent, filldir_t filldir)
427 {
428 	loff_t pos = filp->f_pos;
429 	struct inode *inode = filp->f_dentry->d_inode;
430 	struct super_block *sb = inode->i_sb;
431 	unsigned int offset = pos & ~PAGE_CACHE_MASK;
432 	unsigned long n = pos >> PAGE_CACHE_SHIFT;
433 	unsigned long npages = ufs_dir_pages(inode);
434 	unsigned chunk_mask = ~(UFS_SECTOR_SIZE - 1);
435 	int need_revalidate = filp->f_version != inode->i_version;
436 	unsigned flags = UFS_SB(sb)->s_flags;
437 
438 	UFSD("BEGIN\n");
439 
440 	if (pos > inode->i_size - UFS_DIR_REC_LEN(1))
441 		return 0;
442 
443 	for ( ; n < npages; n++, offset = 0) {
444 		char *kaddr, *limit;
445 		struct ufs_dir_entry *de;
446 
447 		struct page *page = ufs_get_page(inode, n);
448 
449 		if (IS_ERR(page)) {
450 			ufs_error(sb, __FUNCTION__,
451 				  "bad page in #%lu",
452 				  inode->i_ino);
453 			filp->f_pos += PAGE_CACHE_SIZE - offset;
454 			return -EIO;
455 		}
456 		kaddr = page_address(page);
457 		if (unlikely(need_revalidate)) {
458 			if (offset) {
459 				offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask);
460 				filp->f_pos = (n<<PAGE_CACHE_SHIFT) + offset;
461 			}
462 			filp->f_version = inode->i_version;
463 			need_revalidate = 0;
464 		}
465 		de = (struct ufs_dir_entry *)(kaddr+offset);
466 		limit = kaddr + ufs_last_byte(inode, n) - UFS_DIR_REC_LEN(1);
467 		for ( ;(char*)de <= limit; de = ufs_next_entry(sb, de)) {
468 			if (de->d_reclen == 0) {
469 				ufs_error(sb, __FUNCTION__,
470 					"zero-length directory entry");
471 				ufs_put_page(page);
472 				return -EIO;
473 			}
474 			if (de->d_ino) {
475 				int over;
476 				unsigned char d_type = DT_UNKNOWN;
477 
478 				offset = (char *)de - kaddr;
479 
480 				UFSD("filldir(%s,%u)\n", de->d_name,
481 				      fs32_to_cpu(sb, de->d_ino));
482 				UFSD("namlen %u\n", ufs_get_de_namlen(sb, de));
483 
484 				if ((flags & UFS_DE_MASK) == UFS_DE_44BSD)
485 					d_type = de->d_u.d_44.d_type;
486 
487 				over = filldir(dirent, de->d_name,
488 					       ufs_get_de_namlen(sb, de),
489 						(n<<PAGE_CACHE_SHIFT) | offset,
490 					       fs32_to_cpu(sb, de->d_ino), d_type);
491 				if (over) {
492 					ufs_put_page(page);
493 					return 0;
494 				}
495 			}
496 			filp->f_pos += fs16_to_cpu(sb, de->d_reclen);
497 		}
498 		ufs_put_page(page);
499 	}
500 	return 0;
501 }
502 
503 
504 /*
505  * ufs_delete_entry deletes a directory entry by merging it with the
506  * previous entry.
507  */
508 int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
509 		     struct page * page)
510 {
511 	struct super_block *sb = inode->i_sb;
512 	struct address_space *mapping = page->mapping;
513 	char *kaddr = page_address(page);
514 	unsigned from = ((char*)dir - kaddr) & ~(UFS_SECTOR_SIZE - 1);
515 	unsigned to = ((char*)dir - kaddr) + fs16_to_cpu(sb, dir->d_reclen);
516 	struct ufs_dir_entry *pde = NULL;
517 	struct ufs_dir_entry *de = (struct ufs_dir_entry *) (kaddr + from);
518 	int err;
519 
520 	UFSD("ENTER\n");
521 
522 	UFSD("ino %u, reclen %u, namlen %u, name %s\n",
523 	      fs32_to_cpu(sb, de->d_ino),
524 	      fs16_to_cpu(sb, de->d_reclen),
525 	      ufs_get_de_namlen(sb, de), de->d_name);
526 
527 	while ((char*)de < (char*)dir) {
528 		if (de->d_reclen == 0) {
529 			ufs_error(inode->i_sb, __FUNCTION__,
530 				  "zero-length directory entry");
531 			err = -EIO;
532 			goto out;
533 		}
534 		pde = de;
535 		de = ufs_next_entry(sb, de);
536 	}
537 	if (pde)
538 		from = (char*)pde - (char*)page_address(page);
539 	lock_page(page);
540 	err = mapping->a_ops->prepare_write(NULL, page, from, to);
541 	BUG_ON(err);
542 	if (pde)
543 		pde->d_reclen = cpu_to_fs16(sb, to-from);
544 	dir->d_ino = 0;
545 	err = ufs_commit_chunk(page, from, to);
546 	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
547 	mark_inode_dirty(inode);
548 out:
549 	ufs_put_page(page);
550 	UFSD("EXIT\n");
551 	return err;
552 }
553 
554 int ufs_make_empty(struct inode * inode, struct inode *dir)
555 {
556 	struct super_block * sb = dir->i_sb;
557 	struct address_space *mapping = inode->i_mapping;
558 	struct page *page = grab_cache_page(mapping, 0);
559 	struct ufs_dir_entry * de;
560 	char *base;
561 	int err;
562 
563 	if (!page)
564 		return -ENOMEM;
565 	kmap(page);
566 	err = mapping->a_ops->prepare_write(NULL, page, 0, UFS_SECTOR_SIZE);
567 	if (err) {
568 		unlock_page(page);
569 		goto fail;
570 	}
571 
572 
573 	base = (char*)page_address(page);
574 	memset(base, 0, PAGE_CACHE_SIZE);
575 
576 	de = (struct ufs_dir_entry *) base;
577 
578 	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
579 	ufs_set_de_type(sb, de, inode->i_mode);
580 	ufs_set_de_namlen(sb, de, 1);
581 	de->d_reclen = cpu_to_fs16(sb, UFS_DIR_REC_LEN(1));
582 	strcpy (de->d_name, ".");
583 	de = (struct ufs_dir_entry *)
584 		((char *)de + fs16_to_cpu(sb, de->d_reclen));
585 	de->d_ino = cpu_to_fs32(sb, dir->i_ino);
586 	ufs_set_de_type(sb, de, dir->i_mode);
587 	de->d_reclen = cpu_to_fs16(sb, UFS_SECTOR_SIZE - UFS_DIR_REC_LEN(1));
588 	ufs_set_de_namlen(sb, de, 2);
589 	strcpy (de->d_name, "..");
590 
591 	err = ufs_commit_chunk(page, 0, UFS_SECTOR_SIZE);
592 fail:
593 	kunmap(page);
594 	page_cache_release(page);
595 	return err;
596 }
597 
598 /*
599  * routine to check that the specified directory is empty (for rmdir)
600  */
601 int ufs_empty_dir(struct inode * inode)
602 {
603 	struct super_block *sb = inode->i_sb;
604 	struct page *page = NULL;
605 	unsigned long i, npages = ufs_dir_pages(inode);
606 
607 	for (i = 0; i < npages; i++) {
608 		char *kaddr;
609 		struct ufs_dir_entry *de;
610 		page = ufs_get_page(inode, i);
611 
612 		if (IS_ERR(page))
613 			continue;
614 
615 		kaddr = page_address(page);
616 		de = (struct ufs_dir_entry *)kaddr;
617 		kaddr += ufs_last_byte(inode, i) - UFS_DIR_REC_LEN(1);
618 
619 		while ((char *)de <= kaddr) {
620 			if (de->d_reclen == 0) {
621 				ufs_error(inode->i_sb, __FUNCTION__,
622 					"zero-length directory entry: "
623 					"kaddr=%p, de=%p\n", kaddr, de);
624 				goto not_empty;
625 			}
626 			if (de->d_ino) {
627 				u16 namelen=ufs_get_de_namlen(sb, de);
628 				/* check for . and .. */
629 				if (de->d_name[0] != '.')
630 					goto not_empty;
631 				if (namelen > 2)
632 					goto not_empty;
633 				if (namelen < 2) {
634 					if (inode->i_ino !=
635 					    fs32_to_cpu(sb, de->d_ino))
636 						goto not_empty;
637 				} else if (de->d_name[1] != '.')
638 					goto not_empty;
639 			}
640 			de = ufs_next_entry(sb, de);
641 		}
642 		ufs_put_page(page);
643 	}
644 	return 1;
645 
646 not_empty:
647 	ufs_put_page(page);
648 	return 0;
649 }
650 
651 const struct file_operations ufs_dir_operations = {
652 	.read		= generic_read_dir,
653 	.readdir	= ufs_readdir,
654 	.fsync		= file_fsync,
655 };
656