xref: /linux/fs/ufs/dir.c (revision c537b994505099b7197e7d3125b942ecbcc51eb6) 
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 
24 #include "swab.h"
25 #include "util.h"
26 
27 /*
28  * NOTE! unlike strncmp, ufs_match returns 1 for success, 0 for failure.
29  *
30  * len <= UFS_MAXNAMLEN and de != NULL are guaranteed by caller.
31  */
32 static inline int ufs_match(struct super_block *sb, int len,
33 		const char * const name, struct ufs_dir_entry * de)
34 {
35 	if (len != ufs_get_de_namlen(sb, de))
36 		return 0;
37 	if (!de->d_ino)
38 		return 0;
39 	return !memcmp(name, de->d_name, len);
40 }
41 
42 static int ufs_commit_chunk(struct page *page, unsigned from, unsigned to)
43 {
44 	struct inode *dir = page->mapping->host;
45 	int err = 0;
46 	dir->i_version++;
47 	page->mapping->a_ops->commit_write(NULL, page, from, to);
48 	if (IS_DIRSYNC(dir))
49 		err = write_one_page(page, 1);
50 	else
51 		unlock_page(page);
52 	return err;
53 }
54 
55 static inline void ufs_put_page(struct page *page)
56 {
57 	kunmap(page);
58 	page_cache_release(page);
59 }
60 
61 static inline unsigned long ufs_dir_pages(struct inode *inode)
62 {
63 	return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
64 }
65 
66 ino_t ufs_inode_by_name(struct inode *dir, struct dentry *dentry)
67 {
68 	ino_t res = 0;
69 	struct ufs_dir_entry *de;
70 	struct page *page;
71 
72 	de = ufs_find_entry(dir, dentry, &page);
73 	if (de) {
74 		res = fs32_to_cpu(dir->i_sb, de->d_ino);
75 		ufs_put_page(page);
76 	}
77 	return res;
78 }
79 
80 
81 /* Releases the page */
82 void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
83 		  struct page *page, struct inode *inode)
84 {
85 	unsigned from = (char *) de - (char *) page_address(page);
86 	unsigned to = from + fs16_to_cpu(dir->i_sb, de->d_reclen);
87 	int err;
88 
89 	lock_page(page);
90 	err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
91 	BUG_ON(err);
92 	de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
93 	ufs_set_de_type(dir->i_sb, de, inode->i_mode);
94 	err = ufs_commit_chunk(page, from, to);
95 	ufs_put_page(page);
96 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
97 	mark_inode_dirty(dir);
98 }
99 
100 
101 static void ufs_check_page(struct page *page)
102 {
103 	struct inode *dir = page->mapping->host;
104 	struct super_block *sb = dir->i_sb;
105 	char *kaddr = page_address(page);
106 	unsigned offs, rec_len;
107 	unsigned limit = PAGE_CACHE_SIZE;
108 	const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1;
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 & chunk_mask)
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) & ~chunk_mask)
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 	const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
314 	unsigned short rec_len, name_len;
315 	struct page *page = NULL;
316 	struct ufs_dir_entry *de;
317 	unsigned long npages = ufs_dir_pages(dir);
318 	unsigned long n;
319 	char *kaddr;
320 	unsigned from, to;
321 	int err;
322 
323 	UFSD("ENTER, name %s, namelen %u\n", name, namelen);
324 
325 	/*
326 	 * We take care of directory expansion in the same loop.
327 	 * This code plays outside i_size, so it locks the page
328 	 * to protect that region.
329 	 */
330 	for (n = 0; n <= npages; n++) {
331 		char *dir_end;
332 
333 		page = ufs_get_page(dir, n);
334 		err = PTR_ERR(page);
335 		if (IS_ERR(page))
336 			goto out;
337 		lock_page(page);
338 		kaddr = page_address(page);
339 		dir_end = kaddr + ufs_last_byte(dir, n);
340 		de = (struct ufs_dir_entry *)kaddr;
341 		kaddr += PAGE_CACHE_SIZE - reclen;
342 		while ((char *)de <= kaddr) {
343 			if ((char *)de == dir_end) {
344 				/* We hit i_size */
345 				name_len = 0;
346 				rec_len = chunk_size;
347 				de->d_reclen = cpu_to_fs16(sb, chunk_size);
348 				de->d_ino = 0;
349 				goto got_it;
350 			}
351 			if (de->d_reclen == 0) {
352 				ufs_error(dir->i_sb, __FUNCTION__,
353 					  "zero-length directory entry");
354 				err = -EIO;
355 				goto out_unlock;
356 			}
357 			err = -EEXIST;
358 			if (ufs_match(sb, namelen, name, de))
359 				goto out_unlock;
360 			name_len = UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de));
361 			rec_len = fs16_to_cpu(sb, de->d_reclen);
362 			if (!de->d_ino && rec_len >= reclen)
363 				goto got_it;
364 			if (rec_len >= name_len + reclen)
365 				goto got_it;
366 			de = (struct ufs_dir_entry *) ((char *) de + rec_len);
367 		}
368 		unlock_page(page);
369 		ufs_put_page(page);
370 	}
371 	BUG();
372 	return -EINVAL;
373 
374 got_it:
375 	from = (char*)de - (char*)page_address(page);
376 	to = from + rec_len;
377 	err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
378 	if (err)
379 		goto out_unlock;
380 	if (de->d_ino) {
381 		struct ufs_dir_entry *de1 =
382 			(struct ufs_dir_entry *) ((char *) de + name_len);
383 		de1->d_reclen = cpu_to_fs16(sb, rec_len - name_len);
384 		de->d_reclen = cpu_to_fs16(sb, name_len);
385 
386 		de = de1;
387 	}
388 
389 	ufs_set_de_namlen(sb, de, namelen);
390 	memcpy(de->d_name, name, namelen + 1);
391 	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
392 	ufs_set_de_type(sb, de, inode->i_mode);
393 
394 	err = ufs_commit_chunk(page, from, to);
395 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
396 
397 	mark_inode_dirty(dir);
398 	/* OFFSET_CACHE */
399 out_put:
400 	ufs_put_page(page);
401 out:
402 	return err;
403 out_unlock:
404 	unlock_page(page);
405 	goto out_put;
406 }
407 
408 static inline unsigned
409 ufs_validate_entry(struct super_block *sb, char *base,
410 		   unsigned offset, unsigned mask)
411 {
412 	struct ufs_dir_entry *de = (struct ufs_dir_entry*)(base + offset);
413 	struct ufs_dir_entry *p = (struct ufs_dir_entry*)(base + (offset&mask));
414 	while ((char*)p < (char*)de) {
415 		if (p->d_reclen == 0)
416 			break;
417 		p = ufs_next_entry(sb, p);
418 	}
419 	return (char *)p - base;
420 }
421 
422 
423 /*
424  * This is blatantly stolen from ext2fs
425  */
426 static int
427 ufs_readdir(struct file *filp, void *dirent, filldir_t filldir)
428 {
429 	loff_t pos = filp->f_pos;
430 	struct inode *inode = filp->f_path.dentry->d_inode;
431 	struct super_block *sb = inode->i_sb;
432 	unsigned int offset = pos & ~PAGE_CACHE_MASK;
433 	unsigned long n = pos >> PAGE_CACHE_SHIFT;
434 	unsigned long npages = ufs_dir_pages(inode);
435 	unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
436 	int need_revalidate = filp->f_version != inode->i_version;
437 	unsigned flags = UFS_SB(sb)->s_flags;
438 
439 	UFSD("BEGIN\n");
440 
441 	if (pos > inode->i_size - UFS_DIR_REC_LEN(1))
442 		return 0;
443 
444 	for ( ; n < npages; n++, offset = 0) {
445 		char *kaddr, *limit;
446 		struct ufs_dir_entry *de;
447 
448 		struct page *page = ufs_get_page(inode, n);
449 
450 		if (IS_ERR(page)) {
451 			ufs_error(sb, __FUNCTION__,
452 				  "bad page in #%lu",
453 				  inode->i_ino);
454 			filp->f_pos += PAGE_CACHE_SIZE - offset;
455 			return -EIO;
456 		}
457 		kaddr = page_address(page);
458 		if (unlikely(need_revalidate)) {
459 			if (offset) {
460 				offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask);
461 				filp->f_pos = (n<<PAGE_CACHE_SHIFT) + offset;
462 			}
463 			filp->f_version = inode->i_version;
464 			need_revalidate = 0;
465 		}
466 		de = (struct ufs_dir_entry *)(kaddr+offset);
467 		limit = kaddr + ufs_last_byte(inode, n) - UFS_DIR_REC_LEN(1);
468 		for ( ;(char*)de <= limit; de = ufs_next_entry(sb, de)) {
469 			if (de->d_reclen == 0) {
470 				ufs_error(sb, __FUNCTION__,
471 					"zero-length directory entry");
472 				ufs_put_page(page);
473 				return -EIO;
474 			}
475 			if (de->d_ino) {
476 				int over;
477 				unsigned char d_type = DT_UNKNOWN;
478 
479 				offset = (char *)de - kaddr;
480 
481 				UFSD("filldir(%s,%u)\n", de->d_name,
482 				      fs32_to_cpu(sb, de->d_ino));
483 				UFSD("namlen %u\n", ufs_get_de_namlen(sb, de));
484 
485 				if ((flags & UFS_DE_MASK) == UFS_DE_44BSD)
486 					d_type = de->d_u.d_44.d_type;
487 
488 				over = filldir(dirent, de->d_name,
489 					       ufs_get_de_namlen(sb, de),
490 						(n<<PAGE_CACHE_SHIFT) | offset,
491 					       fs32_to_cpu(sb, de->d_ino), d_type);
492 				if (over) {
493 					ufs_put_page(page);
494 					return 0;
495 				}
496 			}
497 			filp->f_pos += fs16_to_cpu(sb, de->d_reclen);
498 		}
499 		ufs_put_page(page);
500 	}
501 	return 0;
502 }
503 
504 
505 /*
506  * ufs_delete_entry deletes a directory entry by merging it with the
507  * previous entry.
508  */
509 int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
510 		     struct page * page)
511 {
512 	struct super_block *sb = inode->i_sb;
513 	struct address_space *mapping = page->mapping;
514 	char *kaddr = page_address(page);
515 	unsigned from = ((char*)dir - kaddr) & ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
516 	unsigned to = ((char*)dir - kaddr) + fs16_to_cpu(sb, dir->d_reclen);
517 	struct ufs_dir_entry *pde = NULL;
518 	struct ufs_dir_entry *de = (struct ufs_dir_entry *) (kaddr + from);
519 	int err;
520 
521 	UFSD("ENTER\n");
522 
523 	UFSD("ino %u, reclen %u, namlen %u, name %s\n",
524 	      fs32_to_cpu(sb, de->d_ino),
525 	      fs16_to_cpu(sb, de->d_reclen),
526 	      ufs_get_de_namlen(sb, de), de->d_name);
527 
528 	while ((char*)de < (char*)dir) {
529 		if (de->d_reclen == 0) {
530 			ufs_error(inode->i_sb, __FUNCTION__,
531 				  "zero-length directory entry");
532 			err = -EIO;
533 			goto out;
534 		}
535 		pde = de;
536 		de = ufs_next_entry(sb, de);
537 	}
538 	if (pde)
539 		from = (char*)pde - (char*)page_address(page);
540 	lock_page(page);
541 	err = mapping->a_ops->prepare_write(NULL, page, from, to);
542 	BUG_ON(err);
543 	if (pde)
544 		pde->d_reclen = cpu_to_fs16(sb, to-from);
545 	dir->d_ino = 0;
546 	err = ufs_commit_chunk(page, from, to);
547 	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
548 	mark_inode_dirty(inode);
549 out:
550 	ufs_put_page(page);
551 	UFSD("EXIT\n");
552 	return err;
553 }
554 
555 int ufs_make_empty(struct inode * inode, struct inode *dir)
556 {
557 	struct super_block * sb = dir->i_sb;
558 	struct address_space *mapping = inode->i_mapping;
559 	struct page *page = grab_cache_page(mapping, 0);
560 	const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
561 	struct ufs_dir_entry * de;
562 	char *base;
563 	int err;
564 
565 	if (!page)
566 		return -ENOMEM;
567 	kmap(page);
568 	err = mapping->a_ops->prepare_write(NULL, page, 0, chunk_size);
569 	if (err) {
570 		unlock_page(page);
571 		goto fail;
572 	}
573 
574 
575 	base = (char*)page_address(page);
576 	memset(base, 0, PAGE_CACHE_SIZE);
577 
578 	de = (struct ufs_dir_entry *) base;
579 
580 	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
581 	ufs_set_de_type(sb, de, inode->i_mode);
582 	ufs_set_de_namlen(sb, de, 1);
583 	de->d_reclen = cpu_to_fs16(sb, UFS_DIR_REC_LEN(1));
584 	strcpy (de->d_name, ".");
585 	de = (struct ufs_dir_entry *)
586 		((char *)de + fs16_to_cpu(sb, de->d_reclen));
587 	de->d_ino = cpu_to_fs32(sb, dir->i_ino);
588 	ufs_set_de_type(sb, de, dir->i_mode);
589 	de->d_reclen = cpu_to_fs16(sb, chunk_size - UFS_DIR_REC_LEN(1));
590 	ufs_set_de_namlen(sb, de, 2);
591 	strcpy (de->d_name, "..");
592 
593 	err = ufs_commit_chunk(page, 0, chunk_size);
594 fail:
595 	kunmap(page);
596 	page_cache_release(page);
597 	return err;
598 }
599 
600 /*
601  * routine to check that the specified directory is empty (for rmdir)
602  */
603 int ufs_empty_dir(struct inode * inode)
604 {
605 	struct super_block *sb = inode->i_sb;
606 	struct page *page = NULL;
607 	unsigned long i, npages = ufs_dir_pages(inode);
608 
609 	for (i = 0; i < npages; i++) {
610 		char *kaddr;
611 		struct ufs_dir_entry *de;
612 		page = ufs_get_page(inode, i);
613 
614 		if (IS_ERR(page))
615 			continue;
616 
617 		kaddr = page_address(page);
618 		de = (struct ufs_dir_entry *)kaddr;
619 		kaddr += ufs_last_byte(inode, i) - UFS_DIR_REC_LEN(1);
620 
621 		while ((char *)de <= kaddr) {
622 			if (de->d_reclen == 0) {
623 				ufs_error(inode->i_sb, __FUNCTION__,
624 					"zero-length directory entry: "
625 					"kaddr=%p, de=%p\n", kaddr, de);
626 				goto not_empty;
627 			}
628 			if (de->d_ino) {
629 				u16 namelen=ufs_get_de_namlen(sb, de);
630 				/* check for . and .. */
631 				if (de->d_name[0] != '.')
632 					goto not_empty;
633 				if (namelen > 2)
634 					goto not_empty;
635 				if (namelen < 2) {
636 					if (inode->i_ino !=
637 					    fs32_to_cpu(sb, de->d_ino))
638 						goto not_empty;
639 				} else if (de->d_name[1] != '.')
640 					goto not_empty;
641 			}
642 			de = ufs_next_entry(sb, de);
643 		}
644 		ufs_put_page(page);
645 	}
646 	return 1;
647 
648 not_empty:
649 	ufs_put_page(page);
650 	return 0;
651 }
652 
653 const struct file_operations ufs_dir_operations = {
654 	.read		= generic_read_dir,
655 	.readdir	= ufs_readdir,
656 	.fsync		= file_fsync,
657 };
658