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
nilfs_rec_len_from_disk(__le16 dlen)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
nilfs_rec_len_to_disk(unsigned int len)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 */
nilfs_chunk_size(struct inode * inode)62 static inline unsigned int nilfs_chunk_size(struct inode *inode)
63 {
64 return inode->i_sb->s_blocksize;
65 }
66
nilfs_put_page(struct page * page)67 static inline void nilfs_put_page(struct page *page)
68 {
69 kunmap(page);
70 put_page(page);
71 }
72
73 /*
74 * Return the offset into page `page_nr' of the last valid
75 * byte in that page, plus one.
76 */
nilfs_last_byte(struct inode * inode,unsigned long page_nr)77 static unsigned int nilfs_last_byte(struct inode *inode, unsigned long page_nr)
78 {
79 unsigned int last_byte = inode->i_size;
80
81 last_byte -= page_nr << PAGE_SHIFT;
82 if (last_byte > PAGE_SIZE)
83 last_byte = PAGE_SIZE;
84 return last_byte;
85 }
86
nilfs_prepare_chunk(struct page * page,unsigned int from,unsigned int to)87 static int nilfs_prepare_chunk(struct page *page, unsigned int from,
88 unsigned int to)
89 {
90 loff_t pos = page_offset(page) + from;
91
92 return __block_write_begin(page, pos, to - from, nilfs_get_block);
93 }
94
nilfs_commit_chunk(struct page * page,struct address_space * mapping,unsigned int from,unsigned int to)95 static void nilfs_commit_chunk(struct page *page,
96 struct address_space *mapping,
97 unsigned int from, unsigned int to)
98 {
99 struct inode *dir = mapping->host;
100 loff_t pos = page_offset(page) + from;
101 unsigned int len = to - from;
102 unsigned int nr_dirty, copied;
103 int err;
104
105 nr_dirty = nilfs_page_count_clean_buffers(page, from, to);
106 copied = block_write_end(NULL, mapping, pos, len, len, page, NULL);
107 if (pos + copied > dir->i_size)
108 i_size_write(dir, pos + copied);
109 if (IS_DIRSYNC(dir))
110 nilfs_set_transaction_flag(NILFS_TI_SYNC);
111 err = nilfs_set_file_dirty(dir, nr_dirty);
112 WARN_ON(err); /* do not happen */
113 unlock_page(page);
114 }
115
nilfs_check_page(struct page * page)116 static bool nilfs_check_page(struct page *page)
117 {
118 struct inode *dir = page->mapping->host;
119 struct super_block *sb = dir->i_sb;
120 unsigned int chunk_size = nilfs_chunk_size(dir);
121 char *kaddr = page_address(page);
122 unsigned int offs, rec_len;
123 unsigned int limit = PAGE_SIZE;
124 struct nilfs_dir_entry *p;
125 char *error;
126
127 if ((dir->i_size >> PAGE_SHIFT) == page->index) {
128 limit = dir->i_size & ~PAGE_MASK;
129 if (limit & (chunk_size - 1))
130 goto Ebadsize;
131 if (!limit)
132 goto out;
133 }
134 for (offs = 0; offs <= limit - NILFS_DIR_REC_LEN(1); offs += rec_len) {
135 p = (struct nilfs_dir_entry *)(kaddr + offs);
136 rec_len = nilfs_rec_len_from_disk(p->rec_len);
137
138 if (rec_len < NILFS_DIR_REC_LEN(1))
139 goto Eshort;
140 if (rec_len & 3)
141 goto Ealign;
142 if (rec_len < NILFS_DIR_REC_LEN(p->name_len))
143 goto Enamelen;
144 if (((offs + rec_len - 1) ^ offs) & ~(chunk_size-1))
145 goto Espan;
146 }
147 if (offs != limit)
148 goto Eend;
149 out:
150 SetPageChecked(page);
151 return true;
152
153 /* Too bad, we had an error */
154
155 Ebadsize:
156 nilfs_error(sb,
157 "size of directory #%lu is not a multiple of chunk size",
158 dir->i_ino);
159 goto fail;
160 Eshort:
161 error = "rec_len is smaller than minimal";
162 goto bad_entry;
163 Ealign:
164 error = "unaligned directory entry";
165 goto bad_entry;
166 Enamelen:
167 error = "rec_len is too small for name_len";
168 goto bad_entry;
169 Espan:
170 error = "directory entry across blocks";
171 bad_entry:
172 nilfs_error(sb,
173 "bad entry in directory #%lu: %s - offset=%lu, inode=%lu, rec_len=%d, name_len=%d",
174 dir->i_ino, error, (page->index << PAGE_SHIFT) + offs,
175 (unsigned long)le64_to_cpu(p->inode),
176 rec_len, p->name_len);
177 goto fail;
178 Eend:
179 p = (struct nilfs_dir_entry *)(kaddr + offs);
180 nilfs_error(sb,
181 "entry in directory #%lu spans the page boundary offset=%lu, inode=%lu",
182 dir->i_ino, (page->index << PAGE_SHIFT) + offs,
183 (unsigned long)le64_to_cpu(p->inode));
184 fail:
185 SetPageError(page);
186 return false;
187 }
188
nilfs_get_page(struct inode * dir,unsigned long n,struct page ** pagep)189 static void *nilfs_get_page(struct inode *dir, unsigned long n,
190 struct page **pagep)
191 {
192 struct address_space *mapping = dir->i_mapping;
193 struct page *page = read_mapping_page(mapping, n, NULL);
194 void *kaddr;
195
196 if (IS_ERR(page))
197 return page;
198
199 kaddr = kmap(page);
200 if (unlikely(!PageChecked(page))) {
201 if (!nilfs_check_page(page))
202 goto fail;
203 }
204
205 *pagep = page;
206 return kaddr;
207
208 fail:
209 nilfs_put_page(page);
210 return ERR_PTR(-EIO);
211 }
212
213 /*
214 * NOTE! unlike strncmp, nilfs_match returns 1 for success, 0 for failure.
215 *
216 * len <= NILFS_NAME_LEN and de != NULL are guaranteed by caller.
217 */
218 static int
nilfs_match(int len,const unsigned char * name,struct nilfs_dir_entry * de)219 nilfs_match(int len, const unsigned char *name, struct nilfs_dir_entry *de)
220 {
221 if (len != de->name_len)
222 return 0;
223 if (!de->inode)
224 return 0;
225 return !memcmp(name, de->name, len);
226 }
227
228 /*
229 * p is at least 6 bytes before the end of page
230 */
nilfs_next_entry(struct nilfs_dir_entry * p)231 static struct nilfs_dir_entry *nilfs_next_entry(struct nilfs_dir_entry *p)
232 {
233 return (struct nilfs_dir_entry *)((char *)p +
234 nilfs_rec_len_from_disk(p->rec_len));
235 }
236
237 static unsigned char
238 nilfs_filetype_table[NILFS_FT_MAX] = {
239 [NILFS_FT_UNKNOWN] = DT_UNKNOWN,
240 [NILFS_FT_REG_FILE] = DT_REG,
241 [NILFS_FT_DIR] = DT_DIR,
242 [NILFS_FT_CHRDEV] = DT_CHR,
243 [NILFS_FT_BLKDEV] = DT_BLK,
244 [NILFS_FT_FIFO] = DT_FIFO,
245 [NILFS_FT_SOCK] = DT_SOCK,
246 [NILFS_FT_SYMLINK] = DT_LNK,
247 };
248
249 #define S_SHIFT 12
250 static unsigned char
251 nilfs_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
252 [S_IFREG >> S_SHIFT] = NILFS_FT_REG_FILE,
253 [S_IFDIR >> S_SHIFT] = NILFS_FT_DIR,
254 [S_IFCHR >> S_SHIFT] = NILFS_FT_CHRDEV,
255 [S_IFBLK >> S_SHIFT] = NILFS_FT_BLKDEV,
256 [S_IFIFO >> S_SHIFT] = NILFS_FT_FIFO,
257 [S_IFSOCK >> S_SHIFT] = NILFS_FT_SOCK,
258 [S_IFLNK >> S_SHIFT] = NILFS_FT_SYMLINK,
259 };
260
nilfs_set_de_type(struct nilfs_dir_entry * de,struct inode * inode)261 static void nilfs_set_de_type(struct nilfs_dir_entry *de, struct inode *inode)
262 {
263 umode_t mode = inode->i_mode;
264
265 de->file_type = nilfs_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
266 }
267
nilfs_readdir(struct file * file,struct dir_context * ctx)268 static int nilfs_readdir(struct file *file, struct dir_context *ctx)
269 {
270 loff_t pos = ctx->pos;
271 struct inode *inode = file_inode(file);
272 struct super_block *sb = inode->i_sb;
273 unsigned int offset = pos & ~PAGE_MASK;
274 unsigned long n = pos >> PAGE_SHIFT;
275 unsigned long npages = dir_pages(inode);
276
277 if (pos > inode->i_size - NILFS_DIR_REC_LEN(1))
278 return 0;
279
280 for ( ; n < npages; n++, offset = 0) {
281 char *kaddr, *limit;
282 struct nilfs_dir_entry *de;
283 struct page *page;
284
285 kaddr = nilfs_get_page(inode, n, &page);
286 if (IS_ERR(kaddr)) {
287 nilfs_error(sb, "bad page in #%lu", inode->i_ino);
288 ctx->pos += PAGE_SIZE - offset;
289 return -EIO;
290 }
291 de = (struct nilfs_dir_entry *)(kaddr + offset);
292 limit = kaddr + nilfs_last_byte(inode, n) -
293 NILFS_DIR_REC_LEN(1);
294 for ( ; (char *)de <= limit; de = nilfs_next_entry(de)) {
295 if (de->rec_len == 0) {
296 nilfs_error(sb, "zero-length directory entry");
297 nilfs_put_page(page);
298 return -EIO;
299 }
300 if (de->inode) {
301 unsigned char t;
302
303 if (de->file_type < NILFS_FT_MAX)
304 t = nilfs_filetype_table[de->file_type];
305 else
306 t = DT_UNKNOWN;
307
308 if (!dir_emit(ctx, de->name, de->name_len,
309 le64_to_cpu(de->inode), t)) {
310 nilfs_put_page(page);
311 return 0;
312 }
313 }
314 ctx->pos += nilfs_rec_len_from_disk(de->rec_len);
315 }
316 nilfs_put_page(page);
317 }
318 return 0;
319 }
320
321 /*
322 * nilfs_find_entry()
323 *
324 * finds an entry in the specified directory with the wanted name. It
325 * returns the page in which the entry was found, and the entry itself
326 * (as a parameter - res_dir). Page is returned mapped and unlocked.
327 * Entry is guaranteed to be valid.
328 */
329 struct nilfs_dir_entry *
nilfs_find_entry(struct inode * dir,const struct qstr * qstr,struct page ** res_page)330 nilfs_find_entry(struct inode *dir, const struct qstr *qstr,
331 struct page **res_page)
332 {
333 const unsigned char *name = qstr->name;
334 int namelen = qstr->len;
335 unsigned int reclen = NILFS_DIR_REC_LEN(namelen);
336 unsigned long start, n;
337 unsigned long npages = dir_pages(dir);
338 struct page *page = NULL;
339 struct nilfs_inode_info *ei = NILFS_I(dir);
340 struct nilfs_dir_entry *de;
341
342 if (npages == 0)
343 goto out;
344
345 /* OFFSET_CACHE */
346 *res_page = NULL;
347
348 start = ei->i_dir_start_lookup;
349 if (start >= npages)
350 start = 0;
351 n = start;
352 do {
353 char *kaddr = nilfs_get_page(dir, n, &page);
354
355 if (!IS_ERR(kaddr)) {
356 de = (struct nilfs_dir_entry *)kaddr;
357 kaddr += nilfs_last_byte(dir, n) - reclen;
358 while ((char *) de <= kaddr) {
359 if (de->rec_len == 0) {
360 nilfs_error(dir->i_sb,
361 "zero-length directory entry");
362 nilfs_put_page(page);
363 goto out;
364 }
365 if (nilfs_match(namelen, name, de))
366 goto found;
367 de = nilfs_next_entry(de);
368 }
369 nilfs_put_page(page);
370 }
371 if (++n >= npages)
372 n = 0;
373 /* next page is past the blocks we've got */
374 if (unlikely(n > (dir->i_blocks >> (PAGE_SHIFT - 9)))) {
375 nilfs_error(dir->i_sb,
376 "dir %lu size %lld exceeds block count %llu",
377 dir->i_ino, dir->i_size,
378 (unsigned long long)dir->i_blocks);
379 goto out;
380 }
381 } while (n != start);
382 out:
383 return NULL;
384
385 found:
386 *res_page = page;
387 ei->i_dir_start_lookup = n;
388 return de;
389 }
390
nilfs_dotdot(struct inode * dir,struct page ** p)391 struct nilfs_dir_entry *nilfs_dotdot(struct inode *dir, struct page **p)
392 {
393 struct nilfs_dir_entry *de = nilfs_get_page(dir, 0, p);
394
395 if (IS_ERR(de))
396 return NULL;
397 return nilfs_next_entry(de);
398 }
399
nilfs_inode_by_name(struct inode * dir,const struct qstr * qstr)400 ino_t nilfs_inode_by_name(struct inode *dir, const struct qstr *qstr)
401 {
402 ino_t res = 0;
403 struct nilfs_dir_entry *de;
404 struct page *page;
405
406 de = nilfs_find_entry(dir, qstr, &page);
407 if (de) {
408 res = le64_to_cpu(de->inode);
409 kunmap(page);
410 put_page(page);
411 }
412 return res;
413 }
414
415 /* Releases the page */
nilfs_set_link(struct inode * dir,struct nilfs_dir_entry * de,struct page * page,struct inode * inode)416 void nilfs_set_link(struct inode *dir, struct nilfs_dir_entry *de,
417 struct page *page, struct inode *inode)
418 {
419 unsigned int from = (char *)de - (char *)page_address(page);
420 unsigned int to = from + nilfs_rec_len_from_disk(de->rec_len);
421 struct address_space *mapping = page->mapping;
422 int err;
423
424 lock_page(page);
425 err = nilfs_prepare_chunk(page, from, to);
426 BUG_ON(err);
427 de->inode = cpu_to_le64(inode->i_ino);
428 nilfs_set_de_type(de, inode);
429 nilfs_commit_chunk(page, mapping, from, to);
430 nilfs_put_page(page);
431 dir->i_mtime = inode_set_ctime_current(dir);
432 }
433
434 /*
435 * Parent is locked.
436 */
nilfs_add_link(struct dentry * dentry,struct inode * inode)437 int nilfs_add_link(struct dentry *dentry, struct inode *inode)
438 {
439 struct inode *dir = d_inode(dentry->d_parent);
440 const unsigned char *name = dentry->d_name.name;
441 int namelen = dentry->d_name.len;
442 unsigned int chunk_size = nilfs_chunk_size(dir);
443 unsigned int reclen = NILFS_DIR_REC_LEN(namelen);
444 unsigned short rec_len, name_len;
445 struct page *page = NULL;
446 struct nilfs_dir_entry *de;
447 unsigned long npages = dir_pages(dir);
448 unsigned long n;
449 char *kaddr;
450 unsigned int from, to;
451 int err;
452
453 /*
454 * We take care of directory expansion in the same loop.
455 * This code plays outside i_size, so it locks the page
456 * to protect that region.
457 */
458 for (n = 0; n <= npages; n++) {
459 char *dir_end;
460
461 kaddr = nilfs_get_page(dir, n, &page);
462 err = PTR_ERR(kaddr);
463 if (IS_ERR(kaddr))
464 goto out;
465 lock_page(page);
466 dir_end = kaddr + nilfs_last_byte(dir, n);
467 de = (struct nilfs_dir_entry *)kaddr;
468 kaddr += PAGE_SIZE - reclen;
469 while ((char *)de <= kaddr) {
470 if ((char *)de == dir_end) {
471 /* We hit i_size */
472 name_len = 0;
473 rec_len = chunk_size;
474 de->rec_len = nilfs_rec_len_to_disk(chunk_size);
475 de->inode = 0;
476 goto got_it;
477 }
478 if (de->rec_len == 0) {
479 nilfs_error(dir->i_sb,
480 "zero-length directory entry");
481 err = -EIO;
482 goto out_unlock;
483 }
484 err = -EEXIST;
485 if (nilfs_match(namelen, name, de))
486 goto out_unlock;
487 name_len = NILFS_DIR_REC_LEN(de->name_len);
488 rec_len = nilfs_rec_len_from_disk(de->rec_len);
489 if (!de->inode && rec_len >= reclen)
490 goto got_it;
491 if (rec_len >= name_len + reclen)
492 goto got_it;
493 de = (struct nilfs_dir_entry *)((char *)de + rec_len);
494 }
495 unlock_page(page);
496 nilfs_put_page(page);
497 }
498 BUG();
499 return -EINVAL;
500
501 got_it:
502 from = (char *)de - (char *)page_address(page);
503 to = from + rec_len;
504 err = nilfs_prepare_chunk(page, from, to);
505 if (err)
506 goto out_unlock;
507 if (de->inode) {
508 struct nilfs_dir_entry *de1;
509
510 de1 = (struct nilfs_dir_entry *)((char *)de + name_len);
511 de1->rec_len = nilfs_rec_len_to_disk(rec_len - name_len);
512 de->rec_len = nilfs_rec_len_to_disk(name_len);
513 de = de1;
514 }
515 de->name_len = namelen;
516 memcpy(de->name, name, namelen);
517 de->inode = cpu_to_le64(inode->i_ino);
518 nilfs_set_de_type(de, inode);
519 nilfs_commit_chunk(page, page->mapping, from, to);
520 dir->i_mtime = inode_set_ctime_current(dir);
521 nilfs_mark_inode_dirty(dir);
522 /* OFFSET_CACHE */
523 out_put:
524 nilfs_put_page(page);
525 out:
526 return err;
527 out_unlock:
528 unlock_page(page);
529 goto out_put;
530 }
531
532 /*
533 * nilfs_delete_entry deletes a directory entry by merging it with the
534 * previous entry. Page is up-to-date. Releases the page.
535 */
nilfs_delete_entry(struct nilfs_dir_entry * dir,struct page * page)536 int nilfs_delete_entry(struct nilfs_dir_entry *dir, struct page *page)
537 {
538 struct address_space *mapping = page->mapping;
539 struct inode *inode = mapping->host;
540 char *kaddr = page_address(page);
541 unsigned int from, to;
542 struct nilfs_dir_entry *de, *pde = NULL;
543 int err;
544
545 from = ((char *)dir - kaddr) & ~(nilfs_chunk_size(inode) - 1);
546 to = ((char *)dir - kaddr) + nilfs_rec_len_from_disk(dir->rec_len);
547 de = (struct nilfs_dir_entry *)(kaddr + from);
548
549 while ((char *)de < (char *)dir) {
550 if (de->rec_len == 0) {
551 nilfs_error(inode->i_sb,
552 "zero-length directory entry");
553 err = -EIO;
554 goto out;
555 }
556 pde = de;
557 de = nilfs_next_entry(de);
558 }
559 if (pde)
560 from = (char *)pde - (char *)page_address(page);
561 lock_page(page);
562 err = nilfs_prepare_chunk(page, from, to);
563 BUG_ON(err);
564 if (pde)
565 pde->rec_len = nilfs_rec_len_to_disk(to - from);
566 dir->inode = 0;
567 nilfs_commit_chunk(page, mapping, from, to);
568 inode->i_mtime = inode_set_ctime_current(inode);
569 out:
570 nilfs_put_page(page);
571 return err;
572 }
573
574 /*
575 * Set the first fragment of directory.
576 */
nilfs_make_empty(struct inode * inode,struct inode * parent)577 int nilfs_make_empty(struct inode *inode, struct inode *parent)
578 {
579 struct address_space *mapping = inode->i_mapping;
580 struct page *page = grab_cache_page(mapping, 0);
581 unsigned int chunk_size = nilfs_chunk_size(inode);
582 struct nilfs_dir_entry *de;
583 int err;
584 void *kaddr;
585
586 if (!page)
587 return -ENOMEM;
588
589 err = nilfs_prepare_chunk(page, 0, chunk_size);
590 if (unlikely(err)) {
591 unlock_page(page);
592 goto fail;
593 }
594 kaddr = kmap_atomic(page);
595 memset(kaddr, 0, chunk_size);
596 de = (struct nilfs_dir_entry *)kaddr;
597 de->name_len = 1;
598 de->rec_len = nilfs_rec_len_to_disk(NILFS_DIR_REC_LEN(1));
599 memcpy(de->name, ".\0\0", 4);
600 de->inode = cpu_to_le64(inode->i_ino);
601 nilfs_set_de_type(de, inode);
602
603 de = (struct nilfs_dir_entry *)(kaddr + NILFS_DIR_REC_LEN(1));
604 de->name_len = 2;
605 de->rec_len = nilfs_rec_len_to_disk(chunk_size - NILFS_DIR_REC_LEN(1));
606 de->inode = cpu_to_le64(parent->i_ino);
607 memcpy(de->name, "..\0", 4);
608 nilfs_set_de_type(de, inode);
609 kunmap_atomic(kaddr);
610 nilfs_commit_chunk(page, mapping, 0, chunk_size);
611 fail:
612 put_page(page);
613 return err;
614 }
615
616 /*
617 * routine to check that the specified directory is empty (for rmdir)
618 */
nilfs_empty_dir(struct inode * inode)619 int nilfs_empty_dir(struct inode *inode)
620 {
621 struct page *page = NULL;
622 unsigned long i, npages = dir_pages(inode);
623
624 for (i = 0; i < npages; i++) {
625 char *kaddr;
626 struct nilfs_dir_entry *de;
627
628 kaddr = nilfs_get_page(inode, i, &page);
629 if (IS_ERR(kaddr))
630 return 0;
631
632 de = (struct nilfs_dir_entry *)kaddr;
633 kaddr += nilfs_last_byte(inode, i) - NILFS_DIR_REC_LEN(1);
634
635 while ((char *)de <= kaddr) {
636 if (de->rec_len == 0) {
637 nilfs_error(inode->i_sb,
638 "zero-length directory entry (kaddr=%p, de=%p)",
639 kaddr, de);
640 goto not_empty;
641 }
642 if (de->inode != 0) {
643 /* check for . and .. */
644 if (de->name[0] != '.')
645 goto not_empty;
646 if (de->name_len > 2)
647 goto not_empty;
648 if (de->name_len < 2) {
649 if (de->inode !=
650 cpu_to_le64(inode->i_ino))
651 goto not_empty;
652 } else if (de->name[1] != '.')
653 goto not_empty;
654 }
655 de = nilfs_next_entry(de);
656 }
657 nilfs_put_page(page);
658 }
659 return 1;
660
661 not_empty:
662 nilfs_put_page(page);
663 return 0;
664 }
665
666 const struct file_operations nilfs_dir_operations = {
667 .llseek = generic_file_llseek,
668 .read = generic_read_dir,
669 .iterate_shared = nilfs_readdir,
670 .unlocked_ioctl = nilfs_ioctl,
671 #ifdef CONFIG_COMPAT
672 .compat_ioctl = nilfs_compat_ioctl,
673 #endif /* CONFIG_COMPAT */
674 .fsync = nilfs_sync_file,
675
676 };
677