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10#include <linux/fs.h>
11#include <linux/stat.h>
12#include <linux/slab.h>
13#include <linux/namei.h>
14#include <linux/mount.h>
15#include <linux/file.h>
16#include "cifsfs.h"
17#include "cifspdu.h"
18#include "cifsglob.h"
19#include "cifsproto.h"
20#include "cifs_debug.h"
21#include "cifs_fs_sb.h"
22#include "cifs_unicode.h"
23#include "fs_context.h"
24#include "cifs_ioctl.h"
25
26static void
27renew_parental_timestamps(struct dentry *direntry)
28{
29
30
31 do {
32 cifs_set_time(direntry, jiffies);
33 direntry = direntry->d_parent;
34 } while (!IS_ROOT(direntry));
35}
36
37char *
38cifs_build_path_to_root(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb,
39 struct cifs_tcon *tcon, int add_treename)
40{
41 int pplen = ctx->prepath ? strlen(ctx->prepath) + 1 : 0;
42 int dfsplen;
43 char *full_path = NULL;
44
45
46 if (pplen == 0) {
47 full_path = kzalloc(1, GFP_KERNEL);
48 return full_path;
49 }
50
51 if (add_treename)
52 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
53 else
54 dfsplen = 0;
55
56 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
57 if (full_path == NULL)
58 return full_path;
59
60 if (dfsplen)
61 memcpy(full_path, tcon->treeName, dfsplen);
62 full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
63 memcpy(full_path + dfsplen + 1, ctx->prepath, pplen);
64 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
65 return full_path;
66}
67
68
69const char *
70build_path_from_dentry(struct dentry *direntry, void *page)
71{
72 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
73 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
74 bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
75
76 return build_path_from_dentry_optional_prefix(direntry, page,
77 prefix);
78}
79
80char *
81build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
82 bool prefix)
83{
84 int dfsplen;
85 int pplen = 0;
86 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
87 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
88 char dirsep = CIFS_DIR_SEP(cifs_sb);
89 char *s;
90
91 if (unlikely(!page))
92 return ERR_PTR(-ENOMEM);
93
94 if (prefix)
95 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
96 else
97 dfsplen = 0;
98
99 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
100 pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
101
102 s = dentry_path_raw(direntry, page, PATH_MAX);
103 if (IS_ERR(s))
104 return s;
105 if (!s[1])
106 s++;
107 if (s < (char *)page + pplen + dfsplen)
108 return ERR_PTR(-ENAMETOOLONG);
109 if (pplen) {
110 cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
111 s -= pplen;
112 memcpy(s + 1, cifs_sb->prepath, pplen - 1);
113 *s = '/';
114 }
115 if (dirsep != '/') {
116
117 char *p;
118
119 for (p = s; *p; p++)
120 if (*p == '/')
121 *p = dirsep;
122 }
123 if (dfsplen) {
124 s -= dfsplen;
125 memcpy(s, tcon->treeName, dfsplen);
126 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
127 int i;
128 for (i = 0; i < dfsplen; i++) {
129 if (s[i] == '\\')
130 s[i] = '/';
131 }
132 }
133 }
134 return s;
135}
136
137
138
139
140
141
142static int
143check_name(struct dentry *direntry, struct cifs_tcon *tcon)
144{
145 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
146 int i;
147
148 if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
149 direntry->d_name.len >
150 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
151 return -ENAMETOOLONG;
152
153 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
154 for (i = 0; i < direntry->d_name.len; i++) {
155 if (direntry->d_name.name[i] == '\\') {
156 cifs_dbg(FYI, "Invalid file name\n");
157 return -EINVAL;
158 }
159 }
160 }
161 return 0;
162}
163
164
165
166
167static int
168cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
169 struct tcon_link *tlink, unsigned oflags, umode_t mode,
170 __u32 *oplock, struct cifs_fid *fid)
171{
172 int rc = -ENOENT;
173 int create_options = CREATE_NOT_DIR;
174 int desired_access;
175 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
176 struct cifs_tcon *tcon = tlink_tcon(tlink);
177 const char *full_path;
178 void *page = alloc_dentry_path();
179 FILE_ALL_INFO *buf = NULL;
180 struct inode *newinode = NULL;
181 int disposition;
182 struct TCP_Server_Info *server = tcon->ses->server;
183 struct cifs_open_parms oparms;
184
185 *oplock = 0;
186 if (tcon->ses->server->oplocks)
187 *oplock = REQ_OPLOCK;
188
189 full_path = build_path_from_dentry(direntry, page);
190 if (IS_ERR(full_path)) {
191 free_dentry_path(page);
192 return PTR_ERR(full_path);
193 }
194
195 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
196 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
197 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
198 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
199 oflags, oplock, &fid->netfid, xid);
200 switch (rc) {
201 case 0:
202 if (newinode == NULL) {
203
204 goto cifs_create_get_file_info;
205 }
206
207 if (S_ISDIR(newinode->i_mode)) {
208 CIFSSMBClose(xid, tcon, fid->netfid);
209 iput(newinode);
210 rc = -EISDIR;
211 goto out;
212 }
213
214 if (!S_ISREG(newinode->i_mode)) {
215
216
217
218
219
220
221
222 CIFSSMBClose(xid, tcon, fid->netfid);
223 goto cifs_create_get_file_info;
224 }
225
226 goto cifs_create_set_dentry;
227
228 case -ENOENT:
229 goto cifs_create_get_file_info;
230
231 case -EIO:
232 case -EINVAL:
233
234
235
236
237
238
239
240
241 tcon->broken_posix_open = true;
242 break;
243
244 case -EREMOTE:
245 case -EOPNOTSUPP:
246
247
248
249
250
251 break;
252
253 default:
254 goto out;
255 }
256
257
258
259
260
261
262 }
263
264 desired_access = 0;
265 if (OPEN_FMODE(oflags) & FMODE_READ)
266 desired_access |= GENERIC_READ;
267 if (OPEN_FMODE(oflags) & FMODE_WRITE)
268 desired_access |= GENERIC_WRITE;
269
270 disposition = FILE_OVERWRITE_IF;
271 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
272 disposition = FILE_CREATE;
273 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
274 disposition = FILE_OVERWRITE_IF;
275 else if ((oflags & O_CREAT) == O_CREAT)
276 disposition = FILE_OPEN_IF;
277 else
278 cifs_dbg(FYI, "Create flag not set in create function\n");
279
280
281
282
283
284
285 if (!server->ops->open) {
286 rc = -ENOSYS;
287 goto out;
288 }
289
290 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
291 if (buf == NULL) {
292 rc = -ENOMEM;
293 goto out;
294 }
295
296
297
298
299
300 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
301 create_options |= CREATE_OPTION_READONLY;
302
303 oparms.tcon = tcon;
304 oparms.cifs_sb = cifs_sb;
305 oparms.desired_access = desired_access;
306 oparms.create_options = cifs_create_options(cifs_sb, create_options);
307 oparms.disposition = disposition;
308 oparms.path = full_path;
309 oparms.fid = fid;
310 oparms.reconnect = false;
311 oparms.mode = mode;
312 rc = server->ops->open(xid, &oparms, oplock, buf);
313 if (rc) {
314 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
315 goto out;
316 }
317
318
319
320
321
322 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
323 struct cifs_unix_set_info_args args = {
324 .mode = mode,
325 .ctime = NO_CHANGE_64,
326 .atime = NO_CHANGE_64,
327 .mtime = NO_CHANGE_64,
328 .device = 0,
329 };
330
331 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
332 args.uid = current_fsuid();
333 if (inode->i_mode & S_ISGID)
334 args.gid = inode->i_gid;
335 else
336 args.gid = current_fsgid();
337 } else {
338 args.uid = INVALID_UID;
339 args.gid = INVALID_GID;
340 }
341 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
342 current->tgid);
343 } else {
344
345
346
347
348
349
350
351 }
352
353cifs_create_get_file_info:
354
355 if (tcon->unix_ext)
356 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
357 xid);
358 else {
359
360 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
361 xid, fid);
362 if (newinode) {
363 if (server->ops->set_lease_key)
364 server->ops->set_lease_key(newinode, fid);
365 if ((*oplock & CIFS_CREATE_ACTION) && S_ISREG(newinode->i_mode)) {
366 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
367 newinode->i_mode = mode;
368 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
369 newinode->i_uid = current_fsuid();
370 if (inode->i_mode & S_ISGID)
371 newinode->i_gid = inode->i_gid;
372 else
373 newinode->i_gid = current_fsgid();
374 }
375 }
376 }
377 }
378
379cifs_create_set_dentry:
380 if (rc != 0) {
381 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
382 rc);
383 goto out_err;
384 }
385
386 if (newinode)
387 if (S_ISDIR(newinode->i_mode)) {
388 rc = -EISDIR;
389 goto out_err;
390 }
391
392 d_drop(direntry);
393 d_add(direntry, newinode);
394
395out:
396 kfree(buf);
397 free_dentry_path(page);
398 return rc;
399
400out_err:
401 if (server->ops->close)
402 server->ops->close(xid, tcon, fid);
403 if (newinode)
404 iput(newinode);
405 goto out;
406}
407
408int
409cifs_atomic_open(struct inode *inode, struct dentry *direntry,
410 struct file *file, unsigned oflags, umode_t mode)
411{
412 int rc;
413 unsigned int xid;
414 struct tcon_link *tlink;
415 struct cifs_tcon *tcon;
416 struct TCP_Server_Info *server;
417 struct cifs_fid fid;
418 struct cifs_pending_open open;
419 __u32 oplock;
420 struct cifsFileInfo *file_info;
421
422 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
423 return -EIO;
424
425
426
427
428
429
430
431
432
433
434
435
436 if (!(oflags & O_CREAT)) {
437 struct dentry *res;
438
439
440
441
442
443 if (!d_in_lookup(direntry))
444 return -ENOENT;
445
446 res = cifs_lookup(inode, direntry, 0);
447 if (IS_ERR(res))
448 return PTR_ERR(res);
449
450 return finish_no_open(file, res);
451 }
452
453 xid = get_xid();
454
455 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
456 inode, direntry, direntry);
457
458 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
459 if (IS_ERR(tlink)) {
460 rc = PTR_ERR(tlink);
461 goto out_free_xid;
462 }
463
464 tcon = tlink_tcon(tlink);
465
466 rc = check_name(direntry, tcon);
467 if (rc)
468 goto out;
469
470 server = tcon->ses->server;
471
472 if (server->ops->new_lease_key)
473 server->ops->new_lease_key(&fid);
474
475 cifs_add_pending_open(&fid, tlink, &open);
476
477 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
478 &oplock, &fid);
479
480 if (rc) {
481 cifs_del_pending_open(&open);
482 goto out;
483 }
484
485 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
486 file->f_mode |= FMODE_CREATED;
487
488 rc = finish_open(file, direntry, generic_file_open);
489 if (rc) {
490 if (server->ops->close)
491 server->ops->close(xid, tcon, &fid);
492 cifs_del_pending_open(&open);
493 goto out;
494 }
495
496 if (file->f_flags & O_DIRECT &&
497 CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
498 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
499 file->f_op = &cifs_file_direct_nobrl_ops;
500 else
501 file->f_op = &cifs_file_direct_ops;
502 }
503
504 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
505 if (file_info == NULL) {
506 if (server->ops->close)
507 server->ops->close(xid, tcon, &fid);
508 cifs_del_pending_open(&open);
509 rc = -ENOMEM;
510 }
511
512out:
513 cifs_put_tlink(tlink);
514out_free_xid:
515 free_xid(xid);
516 return rc;
517}
518
519int cifs_create(struct user_namespace *mnt_userns, struct inode *inode,
520 struct dentry *direntry, umode_t mode, bool excl)
521{
522 int rc;
523 unsigned int xid = get_xid();
524
525
526
527
528
529
530
531 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
532 struct tcon_link *tlink;
533 struct cifs_tcon *tcon;
534 struct TCP_Server_Info *server;
535 struct cifs_fid fid;
536 __u32 oplock;
537
538 cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
539 inode, direntry, direntry);
540
541 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
542 return -EIO;
543
544 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
545 rc = PTR_ERR(tlink);
546 if (IS_ERR(tlink))
547 goto out_free_xid;
548
549 tcon = tlink_tcon(tlink);
550 server = tcon->ses->server;
551
552 if (server->ops->new_lease_key)
553 server->ops->new_lease_key(&fid);
554
555 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
556 &oplock, &fid);
557 if (!rc && server->ops->close)
558 server->ops->close(xid, tcon, &fid);
559
560 cifs_put_tlink(tlink);
561out_free_xid:
562 free_xid(xid);
563 return rc;
564}
565
566int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode,
567 struct dentry *direntry, umode_t mode, dev_t device_number)
568{
569 int rc = -EPERM;
570 unsigned int xid;
571 struct cifs_sb_info *cifs_sb;
572 struct tcon_link *tlink;
573 struct cifs_tcon *tcon;
574 const char *full_path;
575 void *page;
576
577 if (!old_valid_dev(device_number))
578 return -EINVAL;
579
580 cifs_sb = CIFS_SB(inode->i_sb);
581 if (unlikely(cifs_forced_shutdown(cifs_sb)))
582 return -EIO;
583
584 tlink = cifs_sb_tlink(cifs_sb);
585 if (IS_ERR(tlink))
586 return PTR_ERR(tlink);
587
588 page = alloc_dentry_path();
589 tcon = tlink_tcon(tlink);
590 xid = get_xid();
591
592 full_path = build_path_from_dentry(direntry, page);
593 if (IS_ERR(full_path)) {
594 rc = PTR_ERR(full_path);
595 goto mknod_out;
596 }
597
598 rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
599 full_path, mode,
600 device_number);
601
602mknod_out:
603 free_dentry_path(page);
604 free_xid(xid);
605 cifs_put_tlink(tlink);
606 return rc;
607}
608
609struct dentry *
610cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
611 unsigned int flags)
612{
613 unsigned int xid;
614 int rc = 0;
615 struct cifs_sb_info *cifs_sb;
616 struct tcon_link *tlink;
617 struct cifs_tcon *pTcon;
618 struct inode *newInode = NULL;
619 const char *full_path;
620 void *page;
621 int retry_count = 0;
622
623 xid = get_xid();
624
625 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
626 parent_dir_inode, direntry, direntry);
627
628
629
630 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
631 tlink = cifs_sb_tlink(cifs_sb);
632 if (IS_ERR(tlink)) {
633 free_xid(xid);
634 return ERR_CAST(tlink);
635 }
636 pTcon = tlink_tcon(tlink);
637
638 rc = check_name(direntry, pTcon);
639 if (unlikely(rc)) {
640 cifs_put_tlink(tlink);
641 free_xid(xid);
642 return ERR_PTR(rc);
643 }
644
645
646
647
648 page = alloc_dentry_path();
649 full_path = build_path_from_dentry(direntry, page);
650 if (IS_ERR(full_path)) {
651 cifs_put_tlink(tlink);
652 free_xid(xid);
653 free_dentry_path(page);
654 return ERR_CAST(full_path);
655 }
656
657 if (d_really_is_positive(direntry)) {
658 cifs_dbg(FYI, "non-NULL inode in lookup\n");
659 } else {
660 cifs_dbg(FYI, "NULL inode in lookup\n");
661 }
662 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
663 full_path, d_inode(direntry));
664
665again:
666 if (pTcon->posix_extensions)
667 rc = smb311_posix_get_inode_info(&newInode, full_path, parent_dir_inode->i_sb, xid);
668 else if (pTcon->unix_ext) {
669 rc = cifs_get_inode_info_unix(&newInode, full_path,
670 parent_dir_inode->i_sb, xid);
671 } else {
672 rc = cifs_get_inode_info(&newInode, full_path, NULL,
673 parent_dir_inode->i_sb, xid, NULL);
674 }
675
676 if (rc == 0) {
677
678
679 renew_parental_timestamps(direntry);
680 } else if (rc == -EAGAIN && retry_count++ < 10) {
681 goto again;
682 } else if (rc == -ENOENT) {
683 cifs_set_time(direntry, jiffies);
684 newInode = NULL;
685 } else {
686 if (rc != -EACCES) {
687 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
688
689
690 }
691 newInode = ERR_PTR(rc);
692 }
693 free_dentry_path(page);
694 cifs_put_tlink(tlink);
695 free_xid(xid);
696 return d_splice_alias(newInode, direntry);
697}
698
699static int
700cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
701{
702 struct inode *inode;
703 int rc;
704
705 if (flags & LOOKUP_RCU)
706 return -ECHILD;
707
708 if (d_really_is_positive(direntry)) {
709 inode = d_inode(direntry);
710 if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
711 CIFS_I(inode)->time = 0;
712
713 rc = cifs_revalidate_dentry(direntry);
714 if (rc) {
715 cifs_dbg(FYI, "cifs_revalidate_dentry failed with rc=%d", rc);
716 switch (rc) {
717 case -ENOENT:
718 case -ESTALE:
719
720
721
722
723 return 0;
724 default:
725
726
727
728
729 return rc;
730 }
731 }
732 else {
733
734
735
736
737
738
739
740 if (IS_AUTOMOUNT(inode) &&
741 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
742 spin_lock(&direntry->d_lock);
743 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
744 spin_unlock(&direntry->d_lock);
745 }
746
747 return 1;
748 }
749 }
750
751
752
753
754
755 if (!flags)
756 return 0;
757
758
759
760
761
762
763 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
764 return 0;
765
766 if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
767 return 0;
768
769 return 1;
770}
771
772
773
774
775
776
777
778
779
780
781const struct dentry_operations cifs_dentry_ops = {
782 .d_revalidate = cifs_d_revalidate,
783 .d_automount = cifs_dfs_d_automount,
784
785};
786
787static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
788{
789 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
790 unsigned long hash;
791 wchar_t c;
792 int i, charlen;
793
794 hash = init_name_hash(dentry);
795 for (i = 0; i < q->len; i += charlen) {
796 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
797
798 if (unlikely(charlen < 0))
799 return charlen;
800 hash = partial_name_hash(cifs_toupper(c), hash);
801 }
802 q->hash = end_name_hash(hash);
803
804 return 0;
805}
806
807static int cifs_ci_compare(const struct dentry *dentry,
808 unsigned int len, const char *str, const struct qstr *name)
809{
810 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
811 wchar_t c1, c2;
812 int i, l1, l2;
813
814
815
816
817
818
819
820 if (name->len != len)
821 return 1;
822
823 for (i = 0; i < len; i += l1) {
824
825 l1 = codepage->char2uni(&str[i], len - i, &c1);
826 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
827
828
829
830
831
832 if (unlikely(l1 < 0 && l2 < 0)) {
833 if (str[i] != name->name[i])
834 return 1;
835 l1 = 1;
836 continue;
837 }
838
839
840
841
842
843 if (l1 != l2)
844 return 1;
845
846
847 if (cifs_toupper(c1) != cifs_toupper(c2))
848 return 1;
849 }
850
851 return 0;
852}
853
854const struct dentry_operations cifs_ci_dentry_ops = {
855 .d_revalidate = cifs_d_revalidate,
856 .d_hash = cifs_ci_hash,
857 .d_compare = cifs_ci_compare,
858 .d_automount = cifs_dfs_d_automount,
859};
860