1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * NILFS directory entry operations
4 *
5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Modified for NILFS by Amagai Yoshiji.
8 */
9 /*
10 * linux/fs/ext2/dir.c
11 *
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise Pascal
15 * Universite Pierre et Marie Curie (Paris VI)
16 *
17 * from
18 *
19 * linux/fs/minix/dir.c
20 *
21 * Copyright (C) 1991, 1992 Linus Torvalds
22 *
23 * ext2 directory handling functions
24 *
25 * Big-endian to little-endian byte-swapping/bitmaps by
26 * David S. Miller (davem@caip.rutgers.edu), 1995
27 *
28 * All code that works with directory layout had been switched to pagecache
29 * and moved here. AV
30 */
31
32 #include <linux/pagemap.h>
33 #include "nilfs.h"
34 #include "page.h"
35
36 static inline unsigned int nilfs_rec_len_from_disk(__le16 dlen)
37 {
38 unsigned int len = le16_to_cpu(dlen);
39
40 #if (PAGE_SIZE >= 65536)
41 if (len == NILFS_MAX_REC_LEN)
42 return 1 << 16;
43 #endif
44 return len;
45 }
46
47 static inline __le16 nilfs_rec_len_to_disk(unsigned int len)
48 {
49 #if (PAGE_SIZE >= 65536)
50 if (len == (1 << 16))
51 return cpu_to_le16(NILFS_MAX_REC_LEN);
52
53 BUG_ON(len > (1 << 16));
54 #endif
55 return cpu_to_le16(len);
56 }
57
58 /*
59 * nilfs uses block-sized chunks. Arguably, sector-sized ones would be
60 * more robust, but we have what we have
61 */
62 static inline unsigned int nilfs_chunk_size(struct inode *inode)
63 {
64 return inode->i_sb->s_blocksize;
65 }
66
67 /*
68 * Return the offset into page `page_nr' of the last valid
69 * byte in that page, plus one.
70 */
71 static unsigned int nilfs_last_byte(struct inode *inode, unsigned long page_nr)
72 {
73 unsigned int last_byte = inode->i_size;
74
75 last_byte -= page_nr << PAGE_SHIFT;
76 if (last_byte > PAGE_SIZE)
77 last_byte = PAGE_SIZE;
78 return last_byte;
79 }
80
81 static int nilfs_prepare_chunk(struct folio *folio, unsigned int from,
82 unsigned int to)
83 {
84 loff_t pos = folio_pos(folio) + from;
85
86 return __block_write_begin(&folio->page, pos, to - from, nilfs_get_block);
87 }
88
89 static void nilfs_commit_chunk(struct folio *folio,
90 struct address_space *mapping, size_t from, size_t to)
91 {
92 struct inode *dir = mapping->host;
93 loff_t pos = folio_pos(folio) + from;
94 size_t copied, len = to - from;
95 unsigned int nr_dirty;
96 int err;
97
98 nr_dirty = nilfs_page_count_clean_buffers(&folio->page, from, to);
99 copied = block_write_end(NULL, mapping, pos, len, len, &folio->page, NULL);
100 if (pos + copied > dir->i_size)
101 i_size_write(dir, pos + copied);
102 if (IS_DIRSYNC(dir))
103 nilfs_set_transaction_flag(NILFS_TI_SYNC);
104 err = nilfs_set_file_dirty(dir, nr_dirty);
105 WARN_ON(err); /* do not happen */
106 folio_unlock(folio);
107 }
108
109 static bool nilfs_check_folio(struct folio *folio, char *kaddr)
110 {
111 struct inode *dir = folio->mapping->host;
112 struct super_block *sb = dir->i_sb;
113 unsigned int chunk_size = nilfs_chunk_size(dir);
114 size_t offs, rec_len;
115 size_t limit = folio_size(folio);
116 struct nilfs_dir_entry *p;
117 char *error;
118
119 if (dir->i_size < folio_pos(folio) + limit) {
120 limit = dir->i_size - folio_pos(folio);
121 if (limit & (chunk_size - 1))
122 goto Ebadsize;
123 if (!limit)
124 goto out;
125 }
126 for (offs = 0; offs <= limit - NILFS_DIR_REC_LEN(1); offs += rec_len) {
127 p = (struct nilfs_dir_entry *)(kaddr + offs);
128 rec_len = nilfs_rec_len_from_disk(p->rec_len);
129
130 if (rec_len < NILFS_DIR_REC_LEN(1))
131 goto Eshort;
132 if (rec_len & 3)
133 goto Ealign;
134 if (rec_len < NILFS_DIR_REC_LEN(p->name_len))
135 goto Enamelen;
136 if (((offs + rec_len - 1) ^ offs) & ~(chunk_size-1))
137 goto Espan;
138 if (unlikely(p->inode &&
139 NILFS_PRIVATE_INODE(le64_to_cpu(p->inode))))
140 goto Einumber;
141 }
142 if (offs != limit)
143 goto Eend;
144 out:
145 folio_set_checked(folio);
146 return true;
147
148 /* Too bad, we had an error */
149
150 Ebadsize:
151 nilfs_error(sb,
152 "size of directory #%lu is not a multiple of chunk size",
153 dir->i_ino);
154 goto fail;
155 Eshort:
156 error = "rec_len is smaller than minimal";
157 goto bad_entry;
158 Ealign:
159 error = "unaligned directory entry";
160 goto bad_entry;
161 Enamelen:
162 error = "rec_len is too small for name_len";
163 goto bad_entry;
164 Espan:
165 error = "directory entry across blocks";
166 goto bad_entry;
167 Einumber:
168 error = "disallowed inode number";
169 bad_entry:
170 nilfs_error(sb,
171 "bad entry in directory #%lu: %s - offset=%lu, inode=%lu, rec_len=%zd, name_len=%d",
172 dir->i_ino, error, (folio->index << PAGE_SHIFT) + offs,
173 (unsigned long)le64_to_cpu(p->inode),
174 rec_len, p->name_len);
175 goto fail;
176 Eend:
177 p = (struct nilfs_dir_entry *)(kaddr + offs);
178 nilfs_error(sb,
179 "entry in directory #%lu spans the page boundary offset=%lu, inode=%lu",
180 dir->i_ino, (folio->index << PAGE_SHIFT) + offs,
181 (unsigned long)le64_to_cpu(p->inode));
182 fail:
183 return false;
184 }
185
186 static void *nilfs_get_folio(struct inode *dir, unsigned long n,
187 struct folio **foliop)
188 {
189 struct address_space *mapping = dir->i_mapping;
190 struct folio *folio = read_mapping_folio(mapping, n, NULL);
191 void *kaddr;
192
193 if (IS_ERR(folio))
194 return folio;
195
196 kaddr = kmap_local_folio(folio, 0);
197 if (unlikely(!folio_test_checked(folio))) {
198 if (!nilfs_check_folio(folio, kaddr))
199 goto fail;
200 }
201
202 *foliop = folio;
203 return kaddr;
204
205 fail:
206 folio_release_kmap(folio, kaddr);
207 return ERR_PTR(-EIO);
208 }
209
210 /*
211 * NOTE! unlike strncmp, nilfs_match returns 1 for success, 0 for failure.
212 *
213 * len <= NILFS_NAME_LEN and de != NULL are guaranteed by caller.
214 */
215 static int
216 nilfs_match(int len, const unsigned char *name, struct nilfs_dir_entry *de)
217 {
218 if (len != de->name_len)
219 return 0;
220 if (!de->inode)
221 return 0;
222 return !memcmp(name, de->name, len);
223 }
224
225 /*
226 * p is at least 6 bytes before the end of page
227 */
228 static struct nilfs_dir_entry *nilfs_next_entry(struct nilfs_dir_entry *p)
229 {
230 return (struct nilfs_dir_entry *)((char *)p +
231 nilfs_rec_len_from_disk(p->rec_len));
232 }
233
234 static unsigned char
235 nilfs_filetype_table[NILFS_FT_MAX] = {
236 [NILFS_FT_UNKNOWN] = DT_UNKNOWN,
237 [NILFS_FT_REG_FILE] = DT_REG,
238 [NILFS_FT_DIR] = DT_DIR,
239 [NILFS_FT_CHRDEV] = DT_CHR,
240 [NILFS_FT_BLKDEV] = DT_BLK,
241 [NILFS_FT_FIFO] = DT_FIFO,
242 [NILFS_FT_SOCK] = DT_SOCK,
243 [NILFS_FT_SYMLINK] = DT_LNK,
244 };
245
246 #define S_SHIFT 12
247 static unsigned char
248 nilfs_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
249 [S_IFREG >> S_SHIFT] = NILFS_FT_REG_FILE,
250 [S_IFDIR >> S_SHIFT] = NILFS_FT_DIR,
251 [S_IFCHR >> S_SHIFT] = NILFS_FT_CHRDEV,
252 [S_IFBLK >> S_SHIFT] = NILFS_FT_BLKDEV,
253 [S_IFIFO >> S_SHIFT] = NILFS_FT_FIFO,
254 [S_IFSOCK >> S_SHIFT] = NILFS_FT_SOCK,
255 [S_IFLNK >> S_SHIFT] = NILFS_FT_SYMLINK,
256 };
257
258 static void nilfs_set_de_type(struct nilfs_dir_entry *de, struct inode *inode)
259 {
260 umode_t mode = inode->i_mode;
261
262 de->file_type = nilfs_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
263 }
264
265 static int nilfs_readdir(struct file *file, struct dir_context *ctx)
266 {
267 loff_t pos = ctx->pos;
268 struct inode *inode = file_inode(file);
269 struct super_block *sb = inode->i_sb;
270 unsigned int offset = pos & ~PAGE_MASK;
271 unsigned long n = pos >> PAGE_SHIFT;
272 unsigned long npages = dir_pages(inode);
273
274 if (pos > inode->i_size - NILFS_DIR_REC_LEN(1))
275 return 0;
276
277 for ( ; n < npages; n++, offset = 0) {
278 char *kaddr, *limit;
279 struct nilfs_dir_entry *de;
280 struct folio *folio;
281
282 kaddr = nilfs_get_folio(inode, n, &folio);
283 if (IS_ERR(kaddr)) {
284 nilfs_error(sb, "bad page in #%lu", inode->i_ino);
285 ctx->pos += PAGE_SIZE - offset;
286 return -EIO;
287 }
288 de = (struct nilfs_dir_entry *)(kaddr + offset);
289 limit = kaddr + nilfs_last_byte(inode, n) -
290 NILFS_DIR_REC_LEN(1);
291 for ( ; (char *)de <= limit; de = nilfs_next_entry(de)) {
292 if (de->rec_len == 0) {
293 nilfs_error(sb, "zero-length directory entry");
294 folio_release_kmap(folio, kaddr);
295 return -EIO;
296 }
297 if (de->inode) {
298 unsigned char t;
299
300 if (de->file_type < NILFS_FT_MAX)
301 t = nilfs_filetype_table[de->file_type];
302 else
303 t = DT_UNKNOWN;
304
305 if (!dir_emit(ctx, de->name, de->name_len,
306 le64_to_cpu(de->inode), t)) {
307 folio_release_kmap(folio, kaddr);
308 return 0;
309 }
310 }
311 ctx->pos += nilfs_rec_len_from_disk(de->rec_len);
312 }
313 folio_release_kmap(folio, kaddr);
314 }
315 return 0;
316 }
317
318 /*
319 * nilfs_find_entry()
320 *
321 * Finds an entry in the specified directory with the wanted name. It
322 * returns the folio in which the entry was found, and the entry itself.
323 * The folio is mapped and unlocked. When the caller is finished with
324 * the entry, it should call folio_release_kmap().
325 *
326 * On failure, returns an error pointer and the caller should ignore foliop.
327 */
328 struct nilfs_dir_entry *nilfs_find_entry(struct inode *dir,
329 const struct qstr *qstr, struct folio **foliop)
330 {
331 const unsigned char *name = qstr->name;
332 int namelen = qstr->len;
333 unsigned int reclen = NILFS_DIR_REC_LEN(namelen);
334 unsigned long start, n;
335 unsigned long npages = dir_pages(dir);
336 struct nilfs_inode_info *ei = NILFS_I(dir);
337 struct nilfs_dir_entry *de;
338
339 if (npages == 0)
340 goto out;
341
342 start = ei->i_dir_start_lookup;
343 if (start >= npages)
344 start = 0;
345 n = start;
346 do {
347 char *kaddr = nilfs_get_folio(dir, n, foliop);
348
349 if (IS_ERR(kaddr))
350 return ERR_CAST(kaddr);
351
352 de = (struct nilfs_dir_entry *)kaddr;
353 kaddr += nilfs_last_byte(dir, n) - reclen;
354 while ((char *)de <= kaddr) {
355 if (de->rec_len == 0) {
356 nilfs_error(dir->i_sb,
357 "zero-length directory entry");
358 folio_release_kmap(*foliop, kaddr);
359 goto out;
360 }
361 if (nilfs_match(namelen, name, de))
362 goto found;
363 de = nilfs_next_entry(de);
364 }
365 folio_release_kmap(*foliop, kaddr);
366
367 if (++n >= npages)
368 n = 0;
369 /* next folio is past the blocks we've got */
370 if (unlikely(n > (dir->i_blocks >> (PAGE_SHIFT - 9)))) {
371 nilfs_error(dir->i_sb,
372 "dir %lu size %lld exceeds block count %llu",
373 dir->i_ino, dir->i_size,
374 (unsigned long long)dir->i_blocks);
375 goto out;
376 }
377 } while (n != start);
378 out:
379 return ERR_PTR(-ENOENT);
380
381 found:
382 ei->i_dir_start_lookup = n;
383 return de;
384 }
385
386 struct nilfs_dir_entry *nilfs_dotdot(struct inode *dir, struct folio **foliop)
387 {
388 struct folio *folio;
389 struct nilfs_dir_entry *de, *next_de;
390 size_t limit;
391 char *msg;
392
393 de = nilfs_get_folio(dir, 0, &folio);
394 if (IS_ERR(de))
395 return NULL;
396
397 limit = nilfs_last_byte(dir, 0); /* is a multiple of chunk size */
398 if (unlikely(!limit || le64_to_cpu(de->inode) != dir->i_ino ||
399 !nilfs_match(1, ".", de))) {
400 msg = "missing '.'";
401 goto fail;
402 }
403
404 next_de = nilfs_next_entry(de);
405 /*
406 * If "next_de" has not reached the end of the chunk, there is
407 * at least one more record. Check whether it matches "..".
408 */
409 if (unlikely((char *)next_de == (char *)de + nilfs_chunk_size(dir) ||
410 !nilfs_match(2, "..", next_de))) {
411 msg = "missing '..'";
412 goto fail;
413 }
414 *foliop = folio;
415 return next_de;
416
417 fail:
418 nilfs_error(dir->i_sb, "directory #%lu %s", dir->i_ino, msg);
419 folio_release_kmap(folio, de);
420 return NULL;
421 }
422
423 int nilfs_inode_by_name(struct inode *dir, const struct qstr *qstr, ino_t *ino)
424 {
425 struct nilfs_dir_entry *de;
426 struct folio *folio;
427
428 de = nilfs_find_entry(dir, qstr, &folio);
429 if (IS_ERR(de))
430 return PTR_ERR(de);
431
432 *ino = le64_to_cpu(de->inode);
433 folio_release_kmap(folio, de);
434 return 0;
435 }
436
437 void nilfs_set_link(struct inode *dir, struct nilfs_dir_entry *de,
438 struct folio *folio, struct inode *inode)
439 {
440 size_t from = offset_in_folio(folio, de);
441 size_t to = from + nilfs_rec_len_from_disk(de->rec_len);
442 struct address_space *mapping = folio->mapping;
443 int err;
444
445 folio_lock(folio);
446 err = nilfs_prepare_chunk(folio, from, to);
447 BUG_ON(err);
448 de->inode = cpu_to_le64(inode->i_ino);
449 nilfs_set_de_type(de, inode);
450 nilfs_commit_chunk(folio, mapping, from, to);
451 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
452 }
453
454 /*
455 * Parent is locked.
456 */
457 int nilfs_add_link(struct dentry *dentry, struct inode *inode)
458 {
459 struct inode *dir = d_inode(dentry->d_parent);
460 const unsigned char *name = dentry->d_name.name;
461 int namelen = dentry->d_name.len;
462 unsigned int chunk_size = nilfs_chunk_size(dir);
463 unsigned int reclen = NILFS_DIR_REC_LEN(namelen);
464 unsigned short rec_len, name_len;
465 struct folio *folio = NULL;
466 struct nilfs_dir_entry *de;
467 unsigned long npages = dir_pages(dir);
468 unsigned long n;
469 size_t from, to;
470 int err;
471
472 /*
473 * We take care of directory expansion in the same loop.
474 * This code plays outside i_size, so it locks the folio
475 * to protect that region.
476 */
477 for (n = 0; n <= npages; n++) {
478 char *kaddr = nilfs_get_folio(dir, n, &folio);
479 char *dir_end;
480
481 if (IS_ERR(kaddr))
482 return PTR_ERR(kaddr);
483 folio_lock(folio);
484 dir_end = kaddr + nilfs_last_byte(dir, n);
485 de = (struct nilfs_dir_entry *)kaddr;
486 kaddr += folio_size(folio) - reclen;
487 while ((char *)de <= kaddr) {
488 if ((char *)de == dir_end) {
489 /* We hit i_size */
490 name_len = 0;
491 rec_len = chunk_size;
492 de->rec_len = nilfs_rec_len_to_disk(chunk_size);
493 de->inode = 0;
494 goto got_it;
495 }
496 if (de->rec_len == 0) {
497 nilfs_error(dir->i_sb,
498 "zero-length directory entry");
499 err = -EIO;
500 goto out_unlock;
501 }
502 err = -EEXIST;
503 if (nilfs_match(namelen, name, de))
504 goto out_unlock;
505 name_len = NILFS_DIR_REC_LEN(de->name_len);
506 rec_len = nilfs_rec_len_from_disk(de->rec_len);
507 if (!de->inode && rec_len >= reclen)
508 goto got_it;
509 if (rec_len >= name_len + reclen)
510 goto got_it;
511 de = (struct nilfs_dir_entry *)((char *)de + rec_len);
512 }
513 folio_unlock(folio);
514 folio_release_kmap(folio, kaddr);
515 }
516 BUG();
517 return -EINVAL;
518
519 got_it:
520 from = offset_in_folio(folio, de);
521 to = from + rec_len;
522 err = nilfs_prepare_chunk(folio, from, to);
523 if (err)
524 goto out_unlock;
525 if (de->inode) {
526 struct nilfs_dir_entry *de1;
527
528 de1 = (struct nilfs_dir_entry *)((char *)de + name_len);
529 de1->rec_len = nilfs_rec_len_to_disk(rec_len - name_len);
530 de->rec_len = nilfs_rec_len_to_disk(name_len);
531 de = de1;
532 }
533 de->name_len = namelen;
534 memcpy(de->name, name, namelen);
535 de->inode = cpu_to_le64(inode->i_ino);
536 nilfs_set_de_type(de, inode);
537 nilfs_commit_chunk(folio, folio->mapping, from, to);
538 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
539 nilfs_mark_inode_dirty(dir);
540 /* OFFSET_CACHE */
541 out_put:
542 folio_release_kmap(folio, de);
543 return err;
544 out_unlock:
545 folio_unlock(folio);
546 goto out_put;
547 }
548
549 /*
550 * nilfs_delete_entry deletes a directory entry by merging it with the
551 * previous entry. Folio is up-to-date.
552 */
553 int nilfs_delete_entry(struct nilfs_dir_entry *dir, struct folio *folio)
554 {
555 struct address_space *mapping = folio->mapping;
556 struct inode *inode = mapping->host;
557 char *kaddr = (char *)((unsigned long)dir & ~(folio_size(folio) - 1));
558 size_t from, to;
559 struct nilfs_dir_entry *de, *pde = NULL;
560 int err;
561
562 from = ((char *)dir - kaddr) & ~(nilfs_chunk_size(inode) - 1);
563 to = ((char *)dir - kaddr) + nilfs_rec_len_from_disk(dir->rec_len);
564 de = (struct nilfs_dir_entry *)(kaddr + from);
565
566 while ((char *)de < (char *)dir) {
567 if (de->rec_len == 0) {
568 nilfs_error(inode->i_sb,
569 "zero-length directory entry");
570 err = -EIO;
571 goto out;
572 }
573 pde = de;
574 de = nilfs_next_entry(de);
575 }
576 if (pde)
577 from = (char *)pde - kaddr;
578 folio_lock(folio);
579 err = nilfs_prepare_chunk(folio, from, to);
580 BUG_ON(err);
581 if (pde)
582 pde->rec_len = nilfs_rec_len_to_disk(to - from);
583 dir->inode = 0;
584 nilfs_commit_chunk(folio, mapping, from, to);
585 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
586 out:
587 return err;
588 }
589
590 /*
591 * Set the first fragment of directory.
592 */
593 int nilfs_make_empty(struct inode *inode, struct inode *parent)
594 {
595 struct address_space *mapping = inode->i_mapping;
596 struct folio *folio = filemap_grab_folio(mapping, 0);
597 unsigned int chunk_size = nilfs_chunk_size(inode);
598 struct nilfs_dir_entry *de;
599 int err;
600 void *kaddr;
601
602 if (IS_ERR(folio))
603 return PTR_ERR(folio);
604
605 err = nilfs_prepare_chunk(folio, 0, chunk_size);
606 if (unlikely(err)) {
607 folio_unlock(folio);
608 goto fail;
609 }
610 kaddr = kmap_local_folio(folio, 0);
611 memset(kaddr, 0, chunk_size);
612 de = (struct nilfs_dir_entry *)kaddr;
613 de->name_len = 1;
614 de->rec_len = nilfs_rec_len_to_disk(NILFS_DIR_REC_LEN(1));
615 memcpy(de->name, ".\0\0", 4);
616 de->inode = cpu_to_le64(inode->i_ino);
617 nilfs_set_de_type(de, inode);
618
619 de = (struct nilfs_dir_entry *)(kaddr + NILFS_DIR_REC_LEN(1));
620 de->name_len = 2;
621 de->rec_len = nilfs_rec_len_to_disk(chunk_size - NILFS_DIR_REC_LEN(1));
622 de->inode = cpu_to_le64(parent->i_ino);
623 memcpy(de->name, "..\0", 4);
624 nilfs_set_de_type(de, inode);
625 kunmap_local(kaddr);
626 nilfs_commit_chunk(folio, mapping, 0, chunk_size);
627 fail:
628 folio_put(folio);
629 return err;
630 }
631
632 /*
633 * routine to check that the specified directory is empty (for rmdir)
634 */
635 int nilfs_empty_dir(struct inode *inode)
636 {
637 struct folio *folio = NULL;
638 char *kaddr;
639 unsigned long i, npages = dir_pages(inode);
640
641 for (i = 0; i < npages; i++) {
642 struct nilfs_dir_entry *de;
643
644 kaddr = nilfs_get_folio(inode, i, &folio);
645 if (IS_ERR(kaddr))
646 return 0;
647
648 de = (struct nilfs_dir_entry *)kaddr;
649 kaddr += nilfs_last_byte(inode, i) - NILFS_DIR_REC_LEN(1);
650
651 while ((char *)de <= kaddr) {
652 if (de->rec_len == 0) {
653 nilfs_error(inode->i_sb,
654 "zero-length directory entry (kaddr=%p, de=%p)",
655 kaddr, de);
656 goto not_empty;
657 }
658 if (de->inode != 0) {
659 /* check for . and .. */
660 if (de->name[0] != '.')
661 goto not_empty;
662 if (de->name_len > 2)
663 goto not_empty;
664 if (de->name_len < 2) {
665 if (de->inode !=
666 cpu_to_le64(inode->i_ino))
667 goto not_empty;
668 } else if (de->name[1] != '.')
669 goto not_empty;
670 }
671 de = nilfs_next_entry(de);
672 }
673 folio_release_kmap(folio, kaddr);
674 }
675 return 1;
676
677 not_empty:
678 folio_release_kmap(folio, kaddr);
679 return 0;
680 }
681
682 const struct file_operations nilfs_dir_operations = {
683 .llseek = generic_file_llseek,
684 .read = generic_read_dir,
685 .iterate_shared = nilfs_readdir,
686 .unlocked_ioctl = nilfs_ioctl,
687 #ifdef CONFIG_COMPAT
688 .compat_ioctl = nilfs_compat_ioctl,
689 #endif /* CONFIG_COMPAT */
690 .fsync = nilfs_sync_file,
691
692 };
693
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