1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/ufs/ufs_dir.c
4 *
5 * Copyright (C) 1996
6 * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
7 * Laboratory for Computer Science Research Computing Facility
8 * Rutgers, The State University of New Jersey
9 *
10 * swab support by Francois-Rene Rideau <fare@tunes.org> 19970406
11 *
12 * 4.4BSD (FreeBSD) support added on February 1st 1998 by
13 * Niels Kristian Bech Jensen <nkbj@image.dk> partially based
14 * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.
15 *
16 * Migration to usage of "page cache" on May 2006 by
17 * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
18 */
19
20 #include <linux/time.h>
21 #include <linux/fs.h>
22 #include <linux/swap.h>
23 #include <linux/iversion.h>
24
25 #include "ufs_fs.h"
26 #include "ufs.h"
27 #include "swab.h"
28 #include "util.h"
29
30 /*
31 * NOTE! unlike strncmp, ufs_match returns 1 for success, 0 for failure.
32 *
33 * len <= UFS_MAXNAMLEN and de != NULL are guaranteed by caller.
34 */
ufs_match(struct super_block * sb,int len,const unsigned char * name,struct ufs_dir_entry * de)35 static inline int ufs_match(struct super_block *sb, int len,
36 const unsigned char *name, struct ufs_dir_entry *de)
37 {
38 if (len != ufs_get_de_namlen(sb, de))
39 return 0;
40 if (!de->d_ino)
41 return 0;
42 return !memcmp(name, de->d_name, len);
43 }
44
ufs_commit_chunk(struct folio * folio,loff_t pos,unsigned len)45 static void ufs_commit_chunk(struct folio *folio, loff_t pos, unsigned len)
46 {
47 struct address_space *mapping = folio->mapping;
48 struct inode *dir = mapping->host;
49
50 inode_inc_iversion(dir);
51 block_write_end(NULL, mapping, pos, len, len, folio, NULL);
52 if (pos+len > dir->i_size) {
53 i_size_write(dir, pos+len);
54 mark_inode_dirty(dir);
55 }
56 folio_unlock(folio);
57 }
58
ufs_handle_dirsync(struct inode * dir)59 static int ufs_handle_dirsync(struct inode *dir)
60 {
61 int err;
62
63 err = filemap_write_and_wait(dir->i_mapping);
64 if (!err)
65 err = sync_inode_metadata(dir, 1);
66 return err;
67 }
68
ufs_inode_by_name(struct inode * dir,const struct qstr * qstr)69 ino_t ufs_inode_by_name(struct inode *dir, const struct qstr *qstr)
70 {
71 ino_t res = 0;
72 struct ufs_dir_entry *de;
73 struct folio *folio;
74
75 de = ufs_find_entry(dir, qstr, &folio);
76 if (de) {
77 res = fs32_to_cpu(dir->i_sb, de->d_ino);
78 folio_release_kmap(folio, de);
79 }
80 return res;
81 }
82
83
84 /* Releases the page */
ufs_set_link(struct inode * dir,struct ufs_dir_entry * de,struct folio * folio,struct inode * inode,bool update_times)85 void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
86 struct folio *folio, struct inode *inode,
87 bool update_times)
88 {
89 loff_t pos = folio_pos(folio) + offset_in_folio(folio, de);
90 unsigned len = fs16_to_cpu(dir->i_sb, de->d_reclen);
91 int err;
92
93 folio_lock(folio);
94 err = ufs_prepare_chunk(folio, pos, len);
95 BUG_ON(err);
96
97 de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
98 ufs_set_de_type(dir->i_sb, de, inode->i_mode);
99
100 ufs_commit_chunk(folio, pos, len);
101 folio_release_kmap(folio, de);
102 if (update_times)
103 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
104 mark_inode_dirty(dir);
105 ufs_handle_dirsync(dir);
106 }
107
ufs_check_folio(struct folio * folio,char * kaddr)108 static bool ufs_check_folio(struct folio *folio, char *kaddr)
109 {
110 struct inode *dir = folio->mapping->host;
111 struct super_block *sb = dir->i_sb;
112 unsigned offs, rec_len;
113 unsigned limit = folio_size(folio);
114 const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1;
115 struct ufs_dir_entry *p;
116 char *error;
117
118 if (dir->i_size < folio_pos(folio) + limit) {
119 limit = offset_in_folio(folio, dir->i_size);
120 if (limit & chunk_mask)
121 goto Ebadsize;
122 if (!limit)
123 goto out;
124 }
125 for (offs = 0; offs <= limit - UFS_DIR_REC_LEN(1); offs += rec_len) {
126 p = (struct ufs_dir_entry *)(kaddr + offs);
127 rec_len = fs16_to_cpu(sb, p->d_reclen);
128
129 if (rec_len < UFS_DIR_REC_LEN(1))
130 goto Eshort;
131 if (rec_len & 3)
132 goto Ealign;
133 if (rec_len < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, p)))
134 goto Enamelen;
135 if (((offs + rec_len - 1) ^ offs) & ~chunk_mask)
136 goto Espan;
137 if (fs32_to_cpu(sb, p->d_ino) > (UFS_SB(sb)->s_uspi->s_ipg *
138 UFS_SB(sb)->s_uspi->s_ncg))
139 goto Einumber;
140 }
141 if (offs != limit)
142 goto Eend;
143 out:
144 folio_set_checked(folio);
145 return true;
146
147 /* Too bad, we had an error */
148
149 Ebadsize:
150 ufs_error(sb, __func__,
151 "size of directory #%lu is not a multiple of chunk size",
152 dir->i_ino
153 );
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 = "inode out of bounds";
169 bad_entry:
170 ufs_error(sb, __func__, "bad entry in directory #%lu: %s - "
171 "offset=%llu, rec_len=%d, name_len=%d",
172 dir->i_ino, error, folio_pos(folio) + offs,
173 rec_len, ufs_get_de_namlen(sb, p));
174 goto fail;
175 Eend:
176 p = (struct ufs_dir_entry *)(kaddr + offs);
177 ufs_error(sb, __func__,
178 "entry in directory #%lu spans the page boundary"
179 "offset=%llu",
180 dir->i_ino, folio_pos(folio) + offs);
181 fail:
182 return false;
183 }
184
ufs_get_folio(struct inode * dir,unsigned long n,struct folio ** foliop)185 static void *ufs_get_folio(struct inode *dir, unsigned long n,
186 struct folio **foliop)
187 {
188 struct address_space *mapping = dir->i_mapping;
189 struct folio *folio = read_mapping_folio(mapping, n, NULL);
190 void *kaddr;
191
192 if (IS_ERR(folio))
193 return ERR_CAST(folio);
194 kaddr = kmap_local_folio(folio, 0);
195 if (unlikely(!folio_test_checked(folio))) {
196 if (!ufs_check_folio(folio, kaddr))
197 goto fail;
198 }
199 *foliop = folio;
200 return kaddr;
201
202 fail:
203 folio_release_kmap(folio, kaddr);
204 return ERR_PTR(-EIO);
205 }
206
207 /*
208 * Return the offset into page `page_nr' of the last valid
209 * byte in that page, plus one.
210 */
211 static unsigned
ufs_last_byte(struct inode * inode,unsigned long page_nr)212 ufs_last_byte(struct inode *inode, unsigned long page_nr)
213 {
214 unsigned last_byte = inode->i_size;
215
216 last_byte -= page_nr << PAGE_SHIFT;
217 if (last_byte > PAGE_SIZE)
218 last_byte = PAGE_SIZE;
219 return last_byte;
220 }
221
222 static inline struct ufs_dir_entry *
ufs_next_entry(struct super_block * sb,struct ufs_dir_entry * p)223 ufs_next_entry(struct super_block *sb, struct ufs_dir_entry *p)
224 {
225 return (struct ufs_dir_entry *)((char *)p +
226 fs16_to_cpu(sb, p->d_reclen));
227 }
228
ufs_dotdot(struct inode * dir,struct folio ** foliop)229 struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct folio **foliop)
230 {
231 struct ufs_dir_entry *de = ufs_get_folio(dir, 0, foliop);
232
233 if (!IS_ERR(de))
234 return ufs_next_entry(dir->i_sb, de);
235
236 return NULL;
237 }
238
239 /*
240 * ufs_find_entry()
241 *
242 * finds an entry in the specified directory with the wanted name. It
243 * returns the page in which the entry was found, and the entry itself
244 * (as a parameter - res_dir). Page is returned mapped and unlocked.
245 * Entry is guaranteed to be valid.
246 */
ufs_find_entry(struct inode * dir,const struct qstr * qstr,struct folio ** foliop)247 struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
248 struct folio **foliop)
249 {
250 struct super_block *sb = dir->i_sb;
251 const unsigned char *name = qstr->name;
252 int namelen = qstr->len;
253 unsigned reclen = UFS_DIR_REC_LEN(namelen);
254 unsigned long start, n;
255 unsigned long npages = dir_pages(dir);
256 struct ufs_inode_info *ui = UFS_I(dir);
257 struct ufs_dir_entry *de;
258
259 UFSD("ENTER, dir_ino %lu, name %s, namlen %u\n", dir->i_ino, name, namelen);
260
261 if (npages == 0 || namelen > UFS_MAXNAMLEN)
262 goto out;
263
264 start = ui->i_dir_start_lookup;
265
266 if (start >= npages)
267 start = 0;
268 n = start;
269 do {
270 char *kaddr = ufs_get_folio(dir, n, foliop);
271
272 if (!IS_ERR(kaddr)) {
273 de = (struct ufs_dir_entry *)kaddr;
274 kaddr += ufs_last_byte(dir, n) - reclen;
275 while ((char *) de <= kaddr) {
276 if (ufs_match(sb, namelen, name, de))
277 goto found;
278 de = ufs_next_entry(sb, de);
279 }
280 folio_release_kmap(*foliop, kaddr);
281 }
282 if (++n >= npages)
283 n = 0;
284 } while (n != start);
285 out:
286 return NULL;
287
288 found:
289 ui->i_dir_start_lookup = n;
290 return de;
291 }
292
293 /*
294 * Parent is locked.
295 */
ufs_add_link(struct dentry * dentry,struct inode * inode)296 int ufs_add_link(struct dentry *dentry, struct inode *inode)
297 {
298 struct inode *dir = d_inode(dentry->d_parent);
299 const unsigned char *name = dentry->d_name.name;
300 int namelen = dentry->d_name.len;
301 struct super_block *sb = dir->i_sb;
302 unsigned reclen = UFS_DIR_REC_LEN(namelen);
303 const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
304 unsigned short rec_len, name_len;
305 struct folio *folio = NULL;
306 struct ufs_dir_entry *de;
307 unsigned long npages = dir_pages(dir);
308 unsigned long n;
309 loff_t pos;
310 int err;
311
312 UFSD("ENTER, name %s, namelen %u\n", name, namelen);
313
314 /*
315 * We take care of directory expansion in the same loop.
316 * This code plays outside i_size, so it locks the folio
317 * to protect that region.
318 */
319 for (n = 0; n <= npages; n++) {
320 char *kaddr = ufs_get_folio(dir, n, &folio);
321 char *dir_end;
322
323 if (IS_ERR(kaddr))
324 return PTR_ERR(kaddr);
325 folio_lock(folio);
326 dir_end = kaddr + ufs_last_byte(dir, n);
327 de = (struct ufs_dir_entry *)kaddr;
328 kaddr += folio_size(folio) - reclen;
329 while ((char *)de <= kaddr) {
330 if ((char *)de == dir_end) {
331 /* We hit i_size */
332 name_len = 0;
333 rec_len = chunk_size;
334 de->d_reclen = cpu_to_fs16(sb, chunk_size);
335 de->d_ino = 0;
336 goto got_it;
337 }
338 if (de->d_reclen == 0) {
339 ufs_error(dir->i_sb, __func__,
340 "zero-length directory entry");
341 err = -EIO;
342 goto out_unlock;
343 }
344 err = -EEXIST;
345 if (ufs_match(sb, namelen, name, de))
346 goto out_unlock;
347 name_len = UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de));
348 rec_len = fs16_to_cpu(sb, de->d_reclen);
349 if (!de->d_ino && rec_len >= reclen)
350 goto got_it;
351 if (rec_len >= name_len + reclen)
352 goto got_it;
353 de = (struct ufs_dir_entry *) ((char *) de + rec_len);
354 }
355 folio_unlock(folio);
356 folio_release_kmap(folio, kaddr);
357 }
358 BUG();
359 return -EINVAL;
360
361 got_it:
362 pos = folio_pos(folio) + offset_in_folio(folio, de);
363 err = ufs_prepare_chunk(folio, pos, rec_len);
364 if (err)
365 goto out_unlock;
366 if (de->d_ino) {
367 struct ufs_dir_entry *de1 =
368 (struct ufs_dir_entry *) ((char *) de + name_len);
369 de1->d_reclen = cpu_to_fs16(sb, rec_len - name_len);
370 de->d_reclen = cpu_to_fs16(sb, name_len);
371
372 de = de1;
373 }
374
375 ufs_set_de_namlen(sb, de, namelen);
376 memcpy(de->d_name, name, namelen + 1);
377 de->d_ino = cpu_to_fs32(sb, inode->i_ino);
378 ufs_set_de_type(sb, de, inode->i_mode);
379
380 ufs_commit_chunk(folio, pos, rec_len);
381 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
382
383 mark_inode_dirty(dir);
384 err = ufs_handle_dirsync(dir);
385 /* OFFSET_CACHE */
386 out_put:
387 folio_release_kmap(folio, de);
388 return err;
389 out_unlock:
390 folio_unlock(folio);
391 goto out_put;
392 }
393
394 static inline unsigned
ufs_validate_entry(struct super_block * sb,char * base,unsigned offset,unsigned mask)395 ufs_validate_entry(struct super_block *sb, char *base,
396 unsigned offset, unsigned mask)
397 {
398 struct ufs_dir_entry *de = (struct ufs_dir_entry*)(base + offset);
399 struct ufs_dir_entry *p = (struct ufs_dir_entry*)(base + (offset&mask));
400 while ((char*)p < (char*)de)
401 p = ufs_next_entry(sb, p);
402 return (char *)p - base;
403 }
404
405
406 /*
407 * This is blatantly stolen from ext2fs
408 */
409 static int
ufs_readdir(struct file * file,struct dir_context * ctx)410 ufs_readdir(struct file *file, struct dir_context *ctx)
411 {
412 loff_t pos = ctx->pos;
413 struct inode *inode = file_inode(file);
414 struct super_block *sb = inode->i_sb;
415 unsigned int offset = pos & ~PAGE_MASK;
416 unsigned long n = pos >> PAGE_SHIFT;
417 unsigned long npages = dir_pages(inode);
418 unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
419 bool need_revalidate = !inode_eq_iversion(inode, *(u64 *)file->private_data);
420 unsigned flags = UFS_SB(sb)->s_flags;
421
422 UFSD("BEGIN\n");
423
424 if (pos > inode->i_size - UFS_DIR_REC_LEN(1))
425 return 0;
426
427 for ( ; n < npages; n++, offset = 0) {
428 struct ufs_dir_entry *de;
429 struct folio *folio;
430 char *kaddr = ufs_get_folio(inode, n, &folio);
431 char *limit;
432
433 if (IS_ERR(kaddr)) {
434 ufs_error(sb, __func__,
435 "bad page in #%lu",
436 inode->i_ino);
437 ctx->pos += PAGE_SIZE - offset;
438 return PTR_ERR(kaddr);
439 }
440 if (unlikely(need_revalidate)) {
441 if (offset) {
442 offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask);
443 ctx->pos = (n<<PAGE_SHIFT) + offset;
444 }
445 *(u64 *)file->private_data = inode_query_iversion(inode);
446 need_revalidate = false;
447 }
448 de = (struct ufs_dir_entry *)(kaddr+offset);
449 limit = kaddr + ufs_last_byte(inode, n) - UFS_DIR_REC_LEN(1);
450 for ( ;(char*)de <= limit; de = ufs_next_entry(sb, de)) {
451 if (de->d_ino) {
452 unsigned char d_type = DT_UNKNOWN;
453
454 UFSD("filldir(%s,%u)\n", de->d_name,
455 fs32_to_cpu(sb, de->d_ino));
456 UFSD("namlen %u\n", ufs_get_de_namlen(sb, de));
457
458 if ((flags & UFS_DE_MASK) == UFS_DE_44BSD)
459 d_type = de->d_u.d_44.d_type;
460
461 if (!dir_emit(ctx, de->d_name,
462 ufs_get_de_namlen(sb, de),
463 fs32_to_cpu(sb, de->d_ino),
464 d_type)) {
465 folio_release_kmap(folio, de);
466 return 0;
467 }
468 }
469 ctx->pos += fs16_to_cpu(sb, de->d_reclen);
470 }
471 folio_release_kmap(folio, kaddr);
472 }
473 return 0;
474 }
475
476
477 /*
478 * ufs_delete_entry deletes a directory entry by merging it with the
479 * previous entry.
480 */
ufs_delete_entry(struct inode * inode,struct ufs_dir_entry * dir,struct folio * folio)481 int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
482 struct folio *folio)
483 {
484 struct super_block *sb = inode->i_sb;
485 size_t from, to;
486 char *kaddr;
487 loff_t pos;
488 struct ufs_dir_entry *de, *pde = NULL;
489 int err;
490
491 UFSD("ENTER\n");
492
493 from = offset_in_folio(folio, dir);
494 to = from + fs16_to_cpu(sb, dir->d_reclen);
495 kaddr = (char *)dir - from;
496 from &= ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
497 de = (struct ufs_dir_entry *) (kaddr + from);
498
499 UFSD("ino %u, reclen %u, namlen %u, name %s\n",
500 fs32_to_cpu(sb, de->d_ino),
501 fs16_to_cpu(sb, de->d_reclen),
502 ufs_get_de_namlen(sb, de), de->d_name);
503
504 while ((char*)de < (char*)dir) {
505 if (de->d_reclen == 0) {
506 ufs_error(inode->i_sb, __func__,
507 "zero-length directory entry");
508 err = -EIO;
509 goto out;
510 }
511 pde = de;
512 de = ufs_next_entry(sb, de);
513 }
514 if (pde)
515 from = offset_in_folio(folio, pde);
516 pos = folio_pos(folio) + from;
517 folio_lock(folio);
518 err = ufs_prepare_chunk(folio, pos, to - from);
519 BUG_ON(err);
520 if (pde)
521 pde->d_reclen = cpu_to_fs16(sb, to - from);
522 dir->d_ino = 0;
523 ufs_commit_chunk(folio, pos, to - from);
524 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
525 mark_inode_dirty(inode);
526 err = ufs_handle_dirsync(inode);
527 out:
528 folio_release_kmap(folio, kaddr);
529 UFSD("EXIT\n");
530 return err;
531 }
532
ufs_make_empty(struct inode * inode,struct inode * dir)533 int ufs_make_empty(struct inode * inode, struct inode *dir)
534 {
535 struct super_block * sb = dir->i_sb;
536 struct address_space *mapping = inode->i_mapping;
537 struct folio *folio = filemap_grab_folio(mapping, 0);
538 const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
539 struct ufs_dir_entry * de;
540 int err;
541 char *kaddr;
542
543 if (IS_ERR(folio))
544 return PTR_ERR(folio);
545
546 err = ufs_prepare_chunk(folio, 0, chunk_size);
547 if (err) {
548 folio_unlock(folio);
549 goto fail;
550 }
551
552 kaddr = kmap_local_folio(folio, 0);
553 memset(kaddr, 0, folio_size(folio));
554
555 de = (struct ufs_dir_entry *)kaddr;
556
557 de->d_ino = cpu_to_fs32(sb, inode->i_ino);
558 ufs_set_de_type(sb, de, inode->i_mode);
559 ufs_set_de_namlen(sb, de, 1);
560 de->d_reclen = cpu_to_fs16(sb, UFS_DIR_REC_LEN(1));
561 strcpy (de->d_name, ".");
562 de = (struct ufs_dir_entry *)
563 ((char *)de + fs16_to_cpu(sb, de->d_reclen));
564 de->d_ino = cpu_to_fs32(sb, dir->i_ino);
565 ufs_set_de_type(sb, de, dir->i_mode);
566 de->d_reclen = cpu_to_fs16(sb, chunk_size - UFS_DIR_REC_LEN(1));
567 ufs_set_de_namlen(sb, de, 2);
568 strcpy (de->d_name, "..");
569 kunmap_local(kaddr);
570
571 ufs_commit_chunk(folio, 0, chunk_size);
572 err = ufs_handle_dirsync(inode);
573 fail:
574 folio_put(folio);
575 return err;
576 }
577
578 /*
579 * routine to check that the specified directory is empty (for rmdir)
580 */
ufs_empty_dir(struct inode * inode)581 int ufs_empty_dir(struct inode * inode)
582 {
583 struct super_block *sb = inode->i_sb;
584 struct folio *folio;
585 char *kaddr;
586 unsigned long i, npages = dir_pages(inode);
587
588 for (i = 0; i < npages; i++) {
589 struct ufs_dir_entry *de;
590
591 kaddr = ufs_get_folio(inode, i, &folio);
592 if (IS_ERR(kaddr))
593 continue;
594
595 de = (struct ufs_dir_entry *)kaddr;
596 kaddr += ufs_last_byte(inode, i) - UFS_DIR_REC_LEN(1);
597
598 while ((char *)de <= kaddr) {
599 if (de->d_reclen == 0) {
600 ufs_error(inode->i_sb, __func__,
601 "zero-length directory entry: "
602 "kaddr=%p, de=%p\n", kaddr, de);
603 goto not_empty;
604 }
605 if (de->d_ino) {
606 u16 namelen=ufs_get_de_namlen(sb, de);
607 /* check for . and .. */
608 if (de->d_name[0] != '.')
609 goto not_empty;
610 if (namelen > 2)
611 goto not_empty;
612 if (namelen < 2) {
613 if (inode->i_ino !=
614 fs32_to_cpu(sb, de->d_ino))
615 goto not_empty;
616 } else if (de->d_name[1] != '.')
617 goto not_empty;
618 }
619 de = ufs_next_entry(sb, de);
620 }
621 folio_release_kmap(folio, kaddr);
622 }
623 return 1;
624
625 not_empty:
626 folio_release_kmap(folio, kaddr);
627 return 0;
628 }
629
ufs_dir_open(struct inode * inode,struct file * file)630 static int ufs_dir_open(struct inode *inode, struct file *file)
631 {
632 file->private_data = kzalloc(sizeof(u64), GFP_KERNEL);
633 if (!file->private_data)
634 return -ENOMEM;
635 return 0;
636 }
637
ufs_dir_release(struct inode * inode,struct file * file)638 static int ufs_dir_release(struct inode *inode, struct file *file)
639 {
640 kfree(file->private_data);
641 return 0;
642 }
643
ufs_dir_llseek(struct file * file,loff_t offset,int whence)644 static loff_t ufs_dir_llseek(struct file *file, loff_t offset, int whence)
645 {
646 return generic_llseek_cookie(file, offset, whence,
647 (u64 *)file->private_data);
648 }
649
650 const struct file_operations ufs_dir_operations = {
651 .open = ufs_dir_open,
652 .release = ufs_dir_release,
653 .read = generic_read_dir,
654 .iterate_shared = ufs_readdir,
655 .fsync = generic_file_fsync,
656 .llseek = ufs_dir_llseek,
657 };
658