xref: /openbmc/linux/fs/ufs/dir.c (revision e23feb16)
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/swap.h>
22 
23 #include "ufs_fs.h"
24 #include "ufs.h"
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 unsigned char *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, loff_t pos, unsigned len)
44 {
45 	struct address_space *mapping = page->mapping;
46 	struct inode *dir = mapping->host;
47 	int err = 0;
48 
49 	dir->i_version++;
50 	block_write_end(NULL, mapping, pos, len, len, page, NULL);
51 	if (pos+len > dir->i_size) {
52 		i_size_write(dir, pos+len);
53 		mark_inode_dirty(dir);
54 	}
55 	if (IS_DIRSYNC(dir))
56 		err = write_one_page(page, 1);
57 	else
58 		unlock_page(page);
59 	return err;
60 }
61 
62 static inline void ufs_put_page(struct page *page)
63 {
64 	kunmap(page);
65 	page_cache_release(page);
66 }
67 
68 static inline unsigned long ufs_dir_pages(struct inode *inode)
69 {
70 	return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
71 }
72 
73 ino_t ufs_inode_by_name(struct inode *dir, const struct qstr *qstr)
74 {
75 	ino_t res = 0;
76 	struct ufs_dir_entry *de;
77 	struct page *page;
78 
79 	de = ufs_find_entry(dir, qstr, &page);
80 	if (de) {
81 		res = fs32_to_cpu(dir->i_sb, de->d_ino);
82 		ufs_put_page(page);
83 	}
84 	return res;
85 }
86 
87 
88 /* Releases the page */
89 void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
90 		  struct page *page, struct inode *inode)
91 {
92 	loff_t pos = page_offset(page) +
93 			(char *) de - (char *) page_address(page);
94 	unsigned len = fs16_to_cpu(dir->i_sb, de->d_reclen);
95 	int err;
96 
97 	lock_page(page);
98 	err = ufs_prepare_chunk(page, pos, len);
99 	BUG_ON(err);
100 
101 	de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
102 	ufs_set_de_type(dir->i_sb, de, inode->i_mode);
103 
104 	err = ufs_commit_chunk(page, pos, len);
105 	ufs_put_page(page);
106 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
107 	mark_inode_dirty(dir);
108 }
109 
110 
111 static void ufs_check_page(struct page *page)
112 {
113 	struct inode *dir = page->mapping->host;
114 	struct super_block *sb = dir->i_sb;
115 	char *kaddr = page_address(page);
116 	unsigned offs, rec_len;
117 	unsigned limit = PAGE_CACHE_SIZE;
118 	const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1;
119 	struct ufs_dir_entry *p;
120 	char *error;
121 
122 	if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
123 		limit = dir->i_size & ~PAGE_CACHE_MASK;
124 		if (limit & chunk_mask)
125 			goto Ebadsize;
126 		if (!limit)
127 			goto out;
128 	}
129 	for (offs = 0; offs <= limit - UFS_DIR_REC_LEN(1); offs += rec_len) {
130 		p = (struct ufs_dir_entry *)(kaddr + offs);
131 		rec_len = fs16_to_cpu(sb, p->d_reclen);
132 
133 		if (rec_len < UFS_DIR_REC_LEN(1))
134 			goto Eshort;
135 		if (rec_len & 3)
136 			goto Ealign;
137 		if (rec_len < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, p)))
138 			goto Enamelen;
139 		if (((offs + rec_len - 1) ^ offs) & ~chunk_mask)
140 			goto Espan;
141 		if (fs32_to_cpu(sb, p->d_ino) > (UFS_SB(sb)->s_uspi->s_ipg *
142 						  UFS_SB(sb)->s_uspi->s_ncg))
143 			goto Einumber;
144 	}
145 	if (offs != limit)
146 		goto Eend;
147 out:
148 	SetPageChecked(page);
149 	return;
150 
151 	/* Too bad, we had an error */
152 
153 Ebadsize:
154 	ufs_error(sb, "ufs_check_page",
155 		  "size of directory #%lu is not a multiple of chunk size",
156 		  dir->i_ino
157 	);
158 	goto fail;
159 Eshort:
160 	error = "rec_len is smaller than minimal";
161 	goto bad_entry;
162 Ealign:
163 	error = "unaligned directory entry";
164 	goto bad_entry;
165 Enamelen:
166 	error = "rec_len is too small for name_len";
167 	goto bad_entry;
168 Espan:
169 	error = "directory entry across blocks";
170 	goto bad_entry;
171 Einumber:
172 	error = "inode out of bounds";
173 bad_entry:
174 	ufs_error (sb, "ufs_check_page", "bad entry in directory #%lu: %s - "
175 		   "offset=%lu, rec_len=%d, name_len=%d",
176 		   dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
177 		   rec_len, ufs_get_de_namlen(sb, p));
178 	goto fail;
179 Eend:
180 	p = (struct ufs_dir_entry *)(kaddr + offs);
181 	ufs_error(sb, __func__,
182 		   "entry in directory #%lu spans the page boundary"
183 		   "offset=%lu",
184 		   dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs);
185 fail:
186 	SetPageChecked(page);
187 	SetPageError(page);
188 }
189 
190 static struct page *ufs_get_page(struct inode *dir, unsigned long n)
191 {
192 	struct address_space *mapping = dir->i_mapping;
193 	struct page *page = read_mapping_page(mapping, n, NULL);
194 	if (!IS_ERR(page)) {
195 		kmap(page);
196 		if (!PageChecked(page))
197 			ufs_check_page(page);
198 		if (PageError(page))
199 			goto fail;
200 	}
201 	return page;
202 
203 fail:
204 	ufs_put_page(page);
205 	return ERR_PTR(-EIO);
206 }
207 
208 /*
209  * Return the offset into page `page_nr' of the last valid
210  * byte in that page, plus one.
211  */
212 static unsigned
213 ufs_last_byte(struct inode *inode, unsigned long page_nr)
214 {
215 	unsigned last_byte = inode->i_size;
216 
217 	last_byte -= page_nr << PAGE_CACHE_SHIFT;
218 	if (last_byte > PAGE_CACHE_SIZE)
219 		last_byte = PAGE_CACHE_SIZE;
220 	return last_byte;
221 }
222 
223 static inline struct ufs_dir_entry *
224 ufs_next_entry(struct super_block *sb, struct ufs_dir_entry *p)
225 {
226 	return (struct ufs_dir_entry *)((char *)p +
227 					fs16_to_cpu(sb, p->d_reclen));
228 }
229 
230 struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p)
231 {
232 	struct page *page = ufs_get_page(dir, 0);
233 	struct ufs_dir_entry *de = NULL;
234 
235 	if (!IS_ERR(page)) {
236 		de = ufs_next_entry(dir->i_sb,
237 				    (struct ufs_dir_entry *)page_address(page));
238 		*p = page;
239 	}
240 	return de;
241 }
242 
243 /*
244  *	ufs_find_entry()
245  *
246  * finds an entry in the specified directory with the wanted name. It
247  * returns the page in which the entry was found, and the entry itself
248  * (as a parameter - res_dir). Page is returned mapped and unlocked.
249  * Entry is guaranteed to be valid.
250  */
251 struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
252 				     struct page **res_page)
253 {
254 	struct super_block *sb = dir->i_sb;
255 	const unsigned char *name = qstr->name;
256 	int namelen = qstr->len;
257 	unsigned reclen = UFS_DIR_REC_LEN(namelen);
258 	unsigned long start, n;
259 	unsigned long npages = ufs_dir_pages(dir);
260 	struct page *page = NULL;
261 	struct ufs_inode_info *ui = UFS_I(dir);
262 	struct ufs_dir_entry *de;
263 
264 	UFSD("ENTER, dir_ino %lu, name %s, namlen %u\n", dir->i_ino, name, namelen);
265 
266 	if (npages == 0 || namelen > UFS_MAXNAMLEN)
267 		goto out;
268 
269 	/* OFFSET_CACHE */
270 	*res_page = NULL;
271 
272 	start = ui->i_dir_start_lookup;
273 
274 	if (start >= npages)
275 		start = 0;
276 	n = start;
277 	do {
278 		char *kaddr;
279 		page = ufs_get_page(dir, n);
280 		if (!IS_ERR(page)) {
281 			kaddr = page_address(page);
282 			de = (struct ufs_dir_entry *) kaddr;
283 			kaddr += ufs_last_byte(dir, n) - reclen;
284 			while ((char *) de <= kaddr) {
285 				if (de->d_reclen == 0) {
286 					ufs_error(dir->i_sb, __func__,
287 						  "zero-length directory entry");
288 					ufs_put_page(page);
289 					goto out;
290 				}
291 				if (ufs_match(sb, namelen, name, de))
292 					goto found;
293 				de = ufs_next_entry(sb, de);
294 			}
295 			ufs_put_page(page);
296 		}
297 		if (++n >= npages)
298 			n = 0;
299 	} while (n != start);
300 out:
301 	return NULL;
302 
303 found:
304 	*res_page = page;
305 	ui->i_dir_start_lookup = n;
306 	return de;
307 }
308 
309 /*
310  *	Parent is locked.
311  */
312 int ufs_add_link(struct dentry *dentry, struct inode *inode)
313 {
314 	struct inode *dir = dentry->d_parent->d_inode;
315 	const unsigned char *name = dentry->d_name.name;
316 	int namelen = dentry->d_name.len;
317 	struct super_block *sb = dir->i_sb;
318 	unsigned reclen = UFS_DIR_REC_LEN(namelen);
319 	const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
320 	unsigned short rec_len, name_len;
321 	struct page *page = NULL;
322 	struct ufs_dir_entry *de;
323 	unsigned long npages = ufs_dir_pages(dir);
324 	unsigned long n;
325 	char *kaddr;
326 	loff_t pos;
327 	int err;
328 
329 	UFSD("ENTER, name %s, namelen %u\n", name, namelen);
330 
331 	/*
332 	 * We take care of directory expansion in the same loop.
333 	 * This code plays outside i_size, so it locks the page
334 	 * to protect that region.
335 	 */
336 	for (n = 0; n <= npages; n++) {
337 		char *dir_end;
338 
339 		page = ufs_get_page(dir, n);
340 		err = PTR_ERR(page);
341 		if (IS_ERR(page))
342 			goto out;
343 		lock_page(page);
344 		kaddr = page_address(page);
345 		dir_end = kaddr + ufs_last_byte(dir, n);
346 		de = (struct ufs_dir_entry *)kaddr;
347 		kaddr += PAGE_CACHE_SIZE - reclen;
348 		while ((char *)de <= kaddr) {
349 			if ((char *)de == dir_end) {
350 				/* We hit i_size */
351 				name_len = 0;
352 				rec_len = chunk_size;
353 				de->d_reclen = cpu_to_fs16(sb, chunk_size);
354 				de->d_ino = 0;
355 				goto got_it;
356 			}
357 			if (de->d_reclen == 0) {
358 				ufs_error(dir->i_sb, __func__,
359 					  "zero-length directory entry");
360 				err = -EIO;
361 				goto out_unlock;
362 			}
363 			err = -EEXIST;
364 			if (ufs_match(sb, namelen, name, de))
365 				goto out_unlock;
366 			name_len = UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de));
367 			rec_len = fs16_to_cpu(sb, de->d_reclen);
368 			if (!de->d_ino && rec_len >= reclen)
369 				goto got_it;
370 			if (rec_len >= name_len + reclen)
371 				goto got_it;
372 			de = (struct ufs_dir_entry *) ((char *) de + rec_len);
373 		}
374 		unlock_page(page);
375 		ufs_put_page(page);
376 	}
377 	BUG();
378 	return -EINVAL;
379 
380 got_it:
381 	pos = page_offset(page) +
382 			(char*)de - (char*)page_address(page);
383 	err = ufs_prepare_chunk(page, pos, rec_len);
384 	if (err)
385 		goto out_unlock;
386 	if (de->d_ino) {
387 		struct ufs_dir_entry *de1 =
388 			(struct ufs_dir_entry *) ((char *) de + name_len);
389 		de1->d_reclen = cpu_to_fs16(sb, rec_len - name_len);
390 		de->d_reclen = cpu_to_fs16(sb, name_len);
391 
392 		de = de1;
393 	}
394 
395 	ufs_set_de_namlen(sb, de, namelen);
396 	memcpy(de->d_name, name, namelen + 1);
397 	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
398 	ufs_set_de_type(sb, de, inode->i_mode);
399 
400 	err = ufs_commit_chunk(page, pos, rec_len);
401 	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
402 
403 	mark_inode_dirty(dir);
404 	/* OFFSET_CACHE */
405 out_put:
406 	ufs_put_page(page);
407 out:
408 	return err;
409 out_unlock:
410 	unlock_page(page);
411 	goto out_put;
412 }
413 
414 static inline unsigned
415 ufs_validate_entry(struct super_block *sb, char *base,
416 		   unsigned offset, unsigned mask)
417 {
418 	struct ufs_dir_entry *de = (struct ufs_dir_entry*)(base + offset);
419 	struct ufs_dir_entry *p = (struct ufs_dir_entry*)(base + (offset&mask));
420 	while ((char*)p < (char*)de) {
421 		if (p->d_reclen == 0)
422 			break;
423 		p = ufs_next_entry(sb, p);
424 	}
425 	return (char *)p - base;
426 }
427 
428 
429 /*
430  * This is blatantly stolen from ext2fs
431  */
432 static int
433 ufs_readdir(struct file *file, struct dir_context *ctx)
434 {
435 	loff_t pos = ctx->pos;
436 	struct inode *inode = file_inode(file);
437 	struct super_block *sb = inode->i_sb;
438 	unsigned int offset = pos & ~PAGE_CACHE_MASK;
439 	unsigned long n = pos >> PAGE_CACHE_SHIFT;
440 	unsigned long npages = ufs_dir_pages(inode);
441 	unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
442 	int need_revalidate = file->f_version != inode->i_version;
443 	unsigned flags = UFS_SB(sb)->s_flags;
444 
445 	UFSD("BEGIN\n");
446 
447 	if (pos > inode->i_size - UFS_DIR_REC_LEN(1))
448 		return 0;
449 
450 	for ( ; n < npages; n++, offset = 0) {
451 		char *kaddr, *limit;
452 		struct ufs_dir_entry *de;
453 
454 		struct page *page = ufs_get_page(inode, n);
455 
456 		if (IS_ERR(page)) {
457 			ufs_error(sb, __func__,
458 				  "bad page in #%lu",
459 				  inode->i_ino);
460 			ctx->pos += PAGE_CACHE_SIZE - offset;
461 			return -EIO;
462 		}
463 		kaddr = page_address(page);
464 		if (unlikely(need_revalidate)) {
465 			if (offset) {
466 				offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask);
467 				ctx->pos = (n<<PAGE_CACHE_SHIFT) + offset;
468 			}
469 			file->f_version = inode->i_version;
470 			need_revalidate = 0;
471 		}
472 		de = (struct ufs_dir_entry *)(kaddr+offset);
473 		limit = kaddr + ufs_last_byte(inode, n) - UFS_DIR_REC_LEN(1);
474 		for ( ;(char*)de <= limit; de = ufs_next_entry(sb, de)) {
475 			if (de->d_reclen == 0) {
476 				ufs_error(sb, __func__,
477 					"zero-length directory entry");
478 				ufs_put_page(page);
479 				return -EIO;
480 			}
481 			if (de->d_ino) {
482 				unsigned char d_type = DT_UNKNOWN;
483 
484 				UFSD("filldir(%s,%u)\n", de->d_name,
485 				      fs32_to_cpu(sb, de->d_ino));
486 				UFSD("namlen %u\n", ufs_get_de_namlen(sb, de));
487 
488 				if ((flags & UFS_DE_MASK) == UFS_DE_44BSD)
489 					d_type = de->d_u.d_44.d_type;
490 
491 				if (!dir_emit(ctx, de->d_name,
492 					       ufs_get_de_namlen(sb, de),
493 					       fs32_to_cpu(sb, de->d_ino),
494 					       d_type)) {
495 					ufs_put_page(page);
496 					return 0;
497 				}
498 			}
499 			ctx->pos += fs16_to_cpu(sb, de->d_reclen);
500 		}
501 		ufs_put_page(page);
502 	}
503 	return 0;
504 }
505 
506 
507 /*
508  * ufs_delete_entry deletes a directory entry by merging it with the
509  * previous entry.
510  */
511 int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
512 		     struct page * page)
513 {
514 	struct super_block *sb = inode->i_sb;
515 	char *kaddr = page_address(page);
516 	unsigned from = ((char*)dir - kaddr) & ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
517 	unsigned to = ((char*)dir - kaddr) + fs16_to_cpu(sb, dir->d_reclen);
518 	loff_t pos;
519 	struct ufs_dir_entry *pde = NULL;
520 	struct ufs_dir_entry *de = (struct ufs_dir_entry *) (kaddr + from);
521 	int err;
522 
523 	UFSD("ENTER\n");
524 
525 	UFSD("ino %u, reclen %u, namlen %u, name %s\n",
526 	      fs32_to_cpu(sb, de->d_ino),
527 	      fs16_to_cpu(sb, de->d_reclen),
528 	      ufs_get_de_namlen(sb, de), de->d_name);
529 
530 	while ((char*)de < (char*)dir) {
531 		if (de->d_reclen == 0) {
532 			ufs_error(inode->i_sb, __func__,
533 				  "zero-length directory entry");
534 			err = -EIO;
535 			goto out;
536 		}
537 		pde = de;
538 		de = ufs_next_entry(sb, de);
539 	}
540 	if (pde)
541 		from = (char*)pde - (char*)page_address(page);
542 
543 	pos = page_offset(page) + from;
544 	lock_page(page);
545 	err = ufs_prepare_chunk(page, pos, to - from);
546 	BUG_ON(err);
547 	if (pde)
548 		pde->d_reclen = cpu_to_fs16(sb, to - from);
549 	dir->d_ino = 0;
550 	err = ufs_commit_chunk(page, pos, to - from);
551 	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
552 	mark_inode_dirty(inode);
553 out:
554 	ufs_put_page(page);
555 	UFSD("EXIT\n");
556 	return err;
557 }
558 
559 int ufs_make_empty(struct inode * inode, struct inode *dir)
560 {
561 	struct super_block * sb = dir->i_sb;
562 	struct address_space *mapping = inode->i_mapping;
563 	struct page *page = grab_cache_page(mapping, 0);
564 	const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
565 	struct ufs_dir_entry * de;
566 	char *base;
567 	int err;
568 
569 	if (!page)
570 		return -ENOMEM;
571 
572 	err = ufs_prepare_chunk(page, 0, chunk_size);
573 	if (err) {
574 		unlock_page(page);
575 		goto fail;
576 	}
577 
578 	kmap(page);
579 	base = (char*)page_address(page);
580 	memset(base, 0, PAGE_CACHE_SIZE);
581 
582 	de = (struct ufs_dir_entry *) base;
583 
584 	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
585 	ufs_set_de_type(sb, de, inode->i_mode);
586 	ufs_set_de_namlen(sb, de, 1);
587 	de->d_reclen = cpu_to_fs16(sb, UFS_DIR_REC_LEN(1));
588 	strcpy (de->d_name, ".");
589 	de = (struct ufs_dir_entry *)
590 		((char *)de + fs16_to_cpu(sb, de->d_reclen));
591 	de->d_ino = cpu_to_fs32(sb, dir->i_ino);
592 	ufs_set_de_type(sb, de, dir->i_mode);
593 	de->d_reclen = cpu_to_fs16(sb, chunk_size - UFS_DIR_REC_LEN(1));
594 	ufs_set_de_namlen(sb, de, 2);
595 	strcpy (de->d_name, "..");
596 	kunmap(page);
597 
598 	err = ufs_commit_chunk(page, 0, chunk_size);
599 fail:
600 	page_cache_release(page);
601 	return err;
602 }
603 
604 /*
605  * routine to check that the specified directory is empty (for rmdir)
606  */
607 int ufs_empty_dir(struct inode * inode)
608 {
609 	struct super_block *sb = inode->i_sb;
610 	struct page *page = NULL;
611 	unsigned long i, npages = ufs_dir_pages(inode);
612 
613 	for (i = 0; i < npages; i++) {
614 		char *kaddr;
615 		struct ufs_dir_entry *de;
616 		page = ufs_get_page(inode, i);
617 
618 		if (IS_ERR(page))
619 			continue;
620 
621 		kaddr = page_address(page);
622 		de = (struct ufs_dir_entry *)kaddr;
623 		kaddr += ufs_last_byte(inode, i) - UFS_DIR_REC_LEN(1);
624 
625 		while ((char *)de <= kaddr) {
626 			if (de->d_reclen == 0) {
627 				ufs_error(inode->i_sb, __func__,
628 					"zero-length directory entry: "
629 					"kaddr=%p, de=%p\n", kaddr, de);
630 				goto not_empty;
631 			}
632 			if (de->d_ino) {
633 				u16 namelen=ufs_get_de_namlen(sb, de);
634 				/* check for . and .. */
635 				if (de->d_name[0] != '.')
636 					goto not_empty;
637 				if (namelen > 2)
638 					goto not_empty;
639 				if (namelen < 2) {
640 					if (inode->i_ino !=
641 					    fs32_to_cpu(sb, de->d_ino))
642 						goto not_empty;
643 				} else if (de->d_name[1] != '.')
644 					goto not_empty;
645 			}
646 			de = ufs_next_entry(sb, de);
647 		}
648 		ufs_put_page(page);
649 	}
650 	return 1;
651 
652 not_empty:
653 	ufs_put_page(page);
654 	return 0;
655 }
656 
657 const struct file_operations ufs_dir_operations = {
658 	.read		= generic_read_dir,
659 	.iterate	= ufs_readdir,
660 	.fsync		= generic_file_fsync,
661 	.llseek		= generic_file_llseek,
662 };
663