[CIFS] fix busy-file renames and refactor cifs_rename logic
[linux-2.6.git] / fs / cifs / dir.c
1 /*
2  *   fs/cifs/dir.c
3  *
4  *   vfs operations that deal with dentries
5  *
6  *   Copyright (C) International Business Machines  Corp., 2002,2008
7  *   Author(s): Steve French (sfrench@us.ibm.com)
8  *
9  *   This library is free software; you can redistribute it and/or modify
10  *   it under the terms of the GNU Lesser General Public License as published
11  *   by the Free Software Foundation; either version 2.1 of the License, or
12  *   (at your option) any later version.
13  *
14  *   This library is distributed in the hope that it will be useful,
15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
17  *   the GNU Lesser General Public License for more details.
18  *
19  *   You should have received a copy of the GNU Lesser General Public License
20  *   along with this library; if not, write to the Free Software
21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  */
23 #include <linux/fs.h>
24 #include <linux/stat.h>
25 #include <linux/slab.h>
26 #include <linux/namei.h>
27 #include "cifsfs.h"
28 #include "cifspdu.h"
29 #include "cifsglob.h"
30 #include "cifsproto.h"
31 #include "cifs_debug.h"
32 #include "cifs_fs_sb.h"
33
34 static void
35 renew_parental_timestamps(struct dentry *direntry)
36 {
37         /* BB check if there is a way to get the kernel to do this or if we
38            really need this */
39         do {
40                 direntry->d_time = jiffies;
41                 direntry = direntry->d_parent;
42         } while (!IS_ROOT(direntry));
43 }
44
45 /* Note: caller must free return buffer */
46 char *
47 build_path_from_dentry(struct dentry *direntry)
48 {
49         struct dentry *temp;
50         int namelen;
51         int pplen;
52         int dfsplen;
53         char *full_path;
54         char dirsep;
55         struct cifs_sb_info *cifs_sb;
56
57         if (direntry == NULL)
58                 return NULL;  /* not much we can do if dentry is freed and
59                 we need to reopen the file after it was closed implicitly
60                 when the server crashed */
61
62         cifs_sb = CIFS_SB(direntry->d_sb);
63         dirsep = CIFS_DIR_SEP(cifs_sb);
64         pplen = cifs_sb->prepathlen;
65         if (cifs_sb->tcon && (cifs_sb->tcon->Flags & SMB_SHARE_IS_IN_DFS))
66                 dfsplen = strnlen(cifs_sb->tcon->treeName, MAX_TREE_SIZE + 1);
67         else
68                 dfsplen = 0;
69 cifs_bp_rename_retry:
70         namelen = pplen + dfsplen;
71         for (temp = direntry; !IS_ROOT(temp);) {
72                 namelen += (1 + temp->d_name.len);
73                 temp = temp->d_parent;
74                 if (temp == NULL) {
75                         cERROR(1, ("corrupt dentry"));
76                         return NULL;
77                 }
78         }
79
80         full_path = kmalloc(namelen+1, GFP_KERNEL);
81         if (full_path == NULL)
82                 return full_path;
83         full_path[namelen] = 0; /* trailing null */
84         for (temp = direntry; !IS_ROOT(temp);) {
85                 namelen -= 1 + temp->d_name.len;
86                 if (namelen < 0) {
87                         break;
88                 } else {
89                         full_path[namelen] = dirsep;
90                         strncpy(full_path + namelen + 1, temp->d_name.name,
91                                 temp->d_name.len);
92                         cFYI(0, ("name: %s", full_path + namelen));
93                 }
94                 temp = temp->d_parent;
95                 if (temp == NULL) {
96                         cERROR(1, ("corrupt dentry"));
97                         kfree(full_path);
98                         return NULL;
99                 }
100         }
101         if (namelen != pplen + dfsplen) {
102                 cERROR(1,
103                        ("did not end path lookup where expected namelen is %d",
104                         namelen));
105                 /* presumably this is only possible if racing with a rename
106                 of one of the parent directories  (we can not lock the dentries
107                 above us to prevent this, but retrying should be harmless) */
108                 kfree(full_path);
109                 goto cifs_bp_rename_retry;
110         }
111         /* DIR_SEP already set for byte  0 / vs \ but not for
112            subsequent slashes in prepath which currently must
113            be entered the right way - not sure if there is an alternative
114            since the '\' is a valid posix character so we can not switch
115            those safely to '/' if any are found in the middle of the prepath */
116         /* BB test paths to Windows with '/' in the midst of prepath */
117
118         if (dfsplen) {
119                 strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
120                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
121                         int i;
122                         for (i = 0; i < dfsplen; i++) {
123                                 if (full_path[i] == '\\')
124                                         full_path[i] = '/';
125                         }
126                 }
127         }
128         strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen);
129         return full_path;
130 }
131
132 /* Inode operations in similar order to how they appear in Linux file fs.h */
133
134 int
135 cifs_create(struct inode *inode, struct dentry *direntry, int mode,
136                 struct nameidata *nd)
137 {
138         int rc = -ENOENT;
139         int xid;
140         int create_options = CREATE_NOT_DIR;
141         int oplock = 0;
142         int desiredAccess = GENERIC_READ | GENERIC_WRITE;
143         __u16 fileHandle;
144         struct cifs_sb_info *cifs_sb;
145         struct cifsTconInfo *pTcon;
146         char *full_path = NULL;
147         FILE_ALL_INFO *buf = NULL;
148         struct inode *newinode = NULL;
149         struct cifsFileInfo *pCifsFile = NULL;
150         struct cifsInodeInfo *pCifsInode;
151         int disposition = FILE_OVERWRITE_IF;
152         bool write_only = false;
153
154         xid = GetXid();
155
156         cifs_sb = CIFS_SB(inode->i_sb);
157         pTcon = cifs_sb->tcon;
158
159         full_path = build_path_from_dentry(direntry);
160         if (full_path == NULL) {
161                 FreeXid(xid);
162                 return -ENOMEM;
163         }
164
165         if (nd && (nd->flags & LOOKUP_OPEN)) {
166                 int oflags = nd->intent.open.flags;
167
168                 desiredAccess = 0;
169                 if (oflags & FMODE_READ)
170                         desiredAccess |= GENERIC_READ;
171                 if (oflags & FMODE_WRITE) {
172                         desiredAccess |= GENERIC_WRITE;
173                         if (!(oflags & FMODE_READ))
174                                 write_only = true;
175                 }
176
177                 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
178                         disposition = FILE_CREATE;
179                 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
180                         disposition = FILE_OVERWRITE_IF;
181                 else if ((oflags & O_CREAT) == O_CREAT)
182                         disposition = FILE_OPEN_IF;
183                 else
184                         cFYI(1, ("Create flag not set in create function"));
185         }
186
187         /* BB add processing to set equivalent of mode - e.g. via CreateX with
188            ACLs */
189         if (oplockEnabled)
190                 oplock = REQ_OPLOCK;
191
192         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
193         if (buf == NULL) {
194                 kfree(full_path);
195                 FreeXid(xid);
196                 return -ENOMEM;
197         }
198
199         mode &= ~current->fs->umask;
200
201         /*
202          * if we're not using unix extensions, see if we need to set
203          * ATTR_READONLY on the create call
204          */
205         if (!pTcon->unix_ext && (mode & S_IWUGO) == 0)
206                 create_options |= CREATE_OPTION_READONLY;
207
208         if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
209                 rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
210                          desiredAccess, create_options,
211                          &fileHandle, &oplock, buf, cifs_sb->local_nls,
212                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
213         else
214                 rc = -EIO; /* no NT SMB support fall into legacy open below */
215
216         if (rc == -EIO) {
217                 /* old server, retry the open legacy style */
218                 rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
219                         desiredAccess, create_options,
220                         &fileHandle, &oplock, buf, cifs_sb->local_nls,
221                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
222         }
223         if (rc) {
224                 cFYI(1, ("cifs_create returned 0x%x", rc));
225         } else {
226                 /* If Open reported that we actually created a file
227                 then we now have to set the mode if possible */
228                 if ((pTcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
229                         struct cifs_unix_set_info_args args = {
230                                 .mode   = mode,
231                                 .ctime  = NO_CHANGE_64,
232                                 .atime  = NO_CHANGE_64,
233                                 .mtime  = NO_CHANGE_64,
234                                 .device = 0,
235                         };
236
237                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
238                                 args.uid = (__u64) current->fsuid;
239                                 if (inode->i_mode & S_ISGID)
240                                         args.gid = (__u64) inode->i_gid;
241                                 else
242                                         args.gid = (__u64) current->fsgid;
243                         } else {
244                                 args.uid = NO_CHANGE_64;
245                                 args.gid = NO_CHANGE_64;
246                         }
247                         CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
248                                 cifs_sb->local_nls,
249                                 cifs_sb->mnt_cifs_flags &
250                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
251                 } else {
252                         /* BB implement mode setting via Windows security
253                            descriptors e.g. */
254                         /* CIFSSMBWinSetPerms(xid,pTcon,path,mode,-1,-1,nls);*/
255
256                         /* Could set r/o dos attribute if mode & 0222 == 0 */
257                 }
258
259                 /* server might mask mode so we have to query for it */
260                 if (pTcon->unix_ext)
261                         rc = cifs_get_inode_info_unix(&newinode, full_path,
262                                                  inode->i_sb, xid);
263                 else {
264                         rc = cifs_get_inode_info(&newinode, full_path,
265                                                  buf, inode->i_sb, xid,
266                                                  &fileHandle);
267                         if (newinode) {
268                                 if (cifs_sb->mnt_cifs_flags &
269                                     CIFS_MOUNT_DYNPERM)
270                                         newinode->i_mode = mode;
271                                 if ((oplock & CIFS_CREATE_ACTION) &&
272                                     (cifs_sb->mnt_cifs_flags &
273                                      CIFS_MOUNT_SET_UID)) {
274                                         newinode->i_uid = current->fsuid;
275                                         if (inode->i_mode & S_ISGID)
276                                                 newinode->i_gid =
277                                                         inode->i_gid;
278                                         else
279                                                 newinode->i_gid =
280                                                         current->fsgid;
281                                 }
282                         }
283                 }
284
285                 if (rc != 0) {
286                         cFYI(1,
287                              ("Create worked but get_inode_info failed rc = %d",
288                               rc));
289                 } else {
290                         if (pTcon->nocase)
291                                 direntry->d_op = &cifs_ci_dentry_ops;
292                         else
293                                 direntry->d_op = &cifs_dentry_ops;
294                         d_instantiate(direntry, newinode);
295                 }
296                 if ((nd == NULL /* nfsd case - nfs srv does not set nd */) ||
297                         (!(nd->flags & LOOKUP_OPEN))) {
298                         /* mknod case - do not leave file open */
299                         CIFSSMBClose(xid, pTcon, fileHandle);
300                 } else if (newinode) {
301                         pCifsFile =
302                            kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
303
304                         if (pCifsFile == NULL)
305                                 goto cifs_create_out;
306                         pCifsFile->netfid = fileHandle;
307                         pCifsFile->pid = current->tgid;
308                         pCifsFile->pInode = newinode;
309                         pCifsFile->invalidHandle = false;
310                         pCifsFile->closePend     = false;
311                         init_MUTEX(&pCifsFile->fh_sem);
312                         mutex_init(&pCifsFile->lock_mutex);
313                         INIT_LIST_HEAD(&pCifsFile->llist);
314                         atomic_set(&pCifsFile->wrtPending, 0);
315
316                         /* set the following in open now
317                                 pCifsFile->pfile = file; */
318                         write_lock(&GlobalSMBSeslock);
319                         list_add(&pCifsFile->tlist, &pTcon->openFileList);
320                         pCifsInode = CIFS_I(newinode);
321                         if (pCifsInode) {
322                                 /* if readable file instance put first in list*/
323                                 if (write_only) {
324                                         list_add_tail(&pCifsFile->flist,
325                                                 &pCifsInode->openFileList);
326                                 } else {
327                                         list_add(&pCifsFile->flist,
328                                                 &pCifsInode->openFileList);
329                                 }
330                                 if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
331                                         pCifsInode->clientCanCacheAll = true;
332                                         pCifsInode->clientCanCacheRead = true;
333                                         cFYI(1, ("Exclusive Oplock inode %p",
334                                                 newinode));
335                                 } else if ((oplock & 0xF) == OPLOCK_READ)
336                                         pCifsInode->clientCanCacheRead = true;
337                         }
338                         write_unlock(&GlobalSMBSeslock);
339                 }
340         }
341 cifs_create_out:
342         kfree(buf);
343         kfree(full_path);
344         FreeXid(xid);
345         return rc;
346 }
347
348 int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
349                 dev_t device_number)
350 {
351         int rc = -EPERM;
352         int xid;
353         struct cifs_sb_info *cifs_sb;
354         struct cifsTconInfo *pTcon;
355         char *full_path = NULL;
356         struct inode *newinode = NULL;
357
358         if (!old_valid_dev(device_number))
359                 return -EINVAL;
360
361         xid = GetXid();
362
363         cifs_sb = CIFS_SB(inode->i_sb);
364         pTcon = cifs_sb->tcon;
365
366         full_path = build_path_from_dentry(direntry);
367         if (full_path == NULL)
368                 rc = -ENOMEM;
369         else if (pTcon->unix_ext) {
370                 struct cifs_unix_set_info_args args = {
371                         .mode   = mode & ~current->fs->umask,
372                         .ctime  = NO_CHANGE_64,
373                         .atime  = NO_CHANGE_64,
374                         .mtime  = NO_CHANGE_64,
375                         .device = device_number,
376                 };
377                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
378                         args.uid = (__u64) current->fsuid;
379                         args.gid = (__u64) current->fsgid;
380                 } else {
381                         args.uid = NO_CHANGE_64;
382                         args.gid = NO_CHANGE_64;
383                 }
384                 rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path,
385                         &args, cifs_sb->local_nls,
386                         cifs_sb->mnt_cifs_flags &
387                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
388
389                 if (!rc) {
390                         rc = cifs_get_inode_info_unix(&newinode, full_path,
391                                                 inode->i_sb, xid);
392                         if (pTcon->nocase)
393                                 direntry->d_op = &cifs_ci_dentry_ops;
394                         else
395                                 direntry->d_op = &cifs_dentry_ops;
396                         if (rc == 0)
397                                 d_instantiate(direntry, newinode);
398                 }
399         } else {
400                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
401                         int oplock = 0;
402                         u16 fileHandle;
403                         FILE_ALL_INFO *buf;
404
405                         cFYI(1, ("sfu compat create special file"));
406
407                         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
408                         if (buf == NULL) {
409                                 kfree(full_path);
410                                 FreeXid(xid);
411                                 return -ENOMEM;
412                         }
413
414                         rc = CIFSSMBOpen(xid, pTcon, full_path,
415                                          FILE_CREATE, /* fail if exists */
416                                          GENERIC_WRITE /* BB would
417                                           WRITE_OWNER | WRITE_DAC be better? */,
418                                          /* Create a file and set the
419                                             file attribute to SYSTEM */
420                                          CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
421                                          &fileHandle, &oplock, buf,
422                                          cifs_sb->local_nls,
423                                          cifs_sb->mnt_cifs_flags &
424                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
425
426                         /* BB FIXME - add handling for backlevel servers
427                            which need legacy open and check for all
428                            calls to SMBOpen for fallback to SMBLeagcyOpen */
429                         if (!rc) {
430                                 /* BB Do not bother to decode buf since no
431                                    local inode yet to put timestamps in,
432                                    but we can reuse it safely */
433                                 unsigned int bytes_written;
434                                 struct win_dev *pdev;
435                                 pdev = (struct win_dev *)buf;
436                                 if (S_ISCHR(mode)) {
437                                         memcpy(pdev->type, "IntxCHR", 8);
438                                         pdev->major =
439                                               cpu_to_le64(MAJOR(device_number));
440                                         pdev->minor =
441                                               cpu_to_le64(MINOR(device_number));
442                                         rc = CIFSSMBWrite(xid, pTcon,
443                                                 fileHandle,
444                                                 sizeof(struct win_dev),
445                                                 0, &bytes_written, (char *)pdev,
446                                                 NULL, 0);
447                                 } else if (S_ISBLK(mode)) {
448                                         memcpy(pdev->type, "IntxBLK", 8);
449                                         pdev->major =
450                                               cpu_to_le64(MAJOR(device_number));
451                                         pdev->minor =
452                                               cpu_to_le64(MINOR(device_number));
453                                         rc = CIFSSMBWrite(xid, pTcon,
454                                                 fileHandle,
455                                                 sizeof(struct win_dev),
456                                                 0, &bytes_written, (char *)pdev,
457                                                 NULL, 0);
458                                 } /* else if(S_ISFIFO */
459                                 CIFSSMBClose(xid, pTcon, fileHandle);
460                                 d_drop(direntry);
461                         }
462                         kfree(buf);
463                         /* add code here to set EAs */
464                 }
465         }
466
467         kfree(full_path);
468         FreeXid(xid);
469         return rc;
470 }
471
472
473 struct dentry *
474 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
475             struct nameidata *nd)
476 {
477         int xid;
478         int rc = 0; /* to get around spurious gcc warning, set to zero here */
479         struct cifs_sb_info *cifs_sb;
480         struct cifsTconInfo *pTcon;
481         struct inode *newInode = NULL;
482         char *full_path = NULL;
483
484         xid = GetXid();
485
486         cFYI(1, (" parent inode = 0x%p name is: %s and dentry = 0x%p",
487               parent_dir_inode, direntry->d_name.name, direntry));
488
489         /* check whether path exists */
490
491         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
492         pTcon = cifs_sb->tcon;
493
494         /*
495          * Don't allow the separator character in a path component.
496          * The VFS will not allow "/", but "\" is allowed by posix.
497          */
498         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
499                 int i;
500                 for (i = 0; i < direntry->d_name.len; i++)
501                         if (direntry->d_name.name[i] == '\\') {
502                                 cFYI(1, ("Invalid file name"));
503                                 FreeXid(xid);
504                                 return ERR_PTR(-EINVAL);
505                         }
506         }
507
508         /* can not grab the rename sem here since it would
509         deadlock in the cases (beginning of sys_rename itself)
510         in which we already have the sb rename sem */
511         full_path = build_path_from_dentry(direntry);
512         if (full_path == NULL) {
513                 FreeXid(xid);
514                 return ERR_PTR(-ENOMEM);
515         }
516
517         if (direntry->d_inode != NULL) {
518                 cFYI(1, (" non-NULL inode in lookup"));
519         } else {
520                 cFYI(1, (" NULL inode in lookup"));
521         }
522         cFYI(1,
523              (" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
524
525         if (pTcon->unix_ext)
526                 rc = cifs_get_inode_info_unix(&newInode, full_path,
527                                               parent_dir_inode->i_sb, xid);
528         else
529                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
530                                          parent_dir_inode->i_sb, xid, NULL);
531
532         if ((rc == 0) && (newInode != NULL)) {
533                 if (pTcon->nocase)
534                         direntry->d_op = &cifs_ci_dentry_ops;
535                 else
536                         direntry->d_op = &cifs_dentry_ops;
537                 d_add(direntry, newInode);
538
539                 /* since paths are not looked up by component - the parent
540                    directories are presumed to be good here */
541                 renew_parental_timestamps(direntry);
542
543         } else if (rc == -ENOENT) {
544                 rc = 0;
545                 direntry->d_time = jiffies;
546                 if (pTcon->nocase)
547                         direntry->d_op = &cifs_ci_dentry_ops;
548                 else
549                         direntry->d_op = &cifs_dentry_ops;
550                 d_add(direntry, NULL);
551         /*      if it was once a directory (but how can we tell?) we could do
552                 shrink_dcache_parent(direntry); */
553         } else if (rc != -EACCES) {
554                 cERROR(1, ("Unexpected lookup error %d", rc));
555                 /* We special case check for Access Denied - since that
556                 is a common return code */
557         }
558
559         kfree(full_path);
560         FreeXid(xid);
561         return ERR_PTR(rc);
562 }
563
564 static int
565 cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
566 {
567         int isValid = 1;
568
569         if (direntry->d_inode) {
570                 if (cifs_revalidate(direntry))
571                         return 0;
572         } else {
573                 cFYI(1, ("neg dentry 0x%p name = %s",
574                          direntry, direntry->d_name.name));
575                 if (time_after(jiffies, direntry->d_time + HZ) ||
576                         !lookupCacheEnabled) {
577                         d_drop(direntry);
578                         isValid = 0;
579                 }
580         }
581
582         return isValid;
583 }
584
585 /* static int cifs_d_delete(struct dentry *direntry)
586 {
587         int rc = 0;
588
589         cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
590
591         return rc;
592 }     */
593
594 struct dentry_operations cifs_dentry_ops = {
595         .d_revalidate = cifs_d_revalidate,
596 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
597 };
598
599 static int cifs_ci_hash(struct dentry *dentry, struct qstr *q)
600 {
601         struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
602         unsigned long hash;
603         int i;
604
605         hash = init_name_hash();
606         for (i = 0; i < q->len; i++)
607                 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
608                                          hash);
609         q->hash = end_name_hash(hash);
610
611         return 0;
612 }
613
614 static int cifs_ci_compare(struct dentry *dentry, struct qstr *a,
615                            struct qstr *b)
616 {
617         struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
618
619         if ((a->len == b->len) &&
620             (nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
621                 /*
622                  * To preserve case, don't let an existing negative dentry's
623                  * case take precedence.  If a is not a negative dentry, this
624                  * should have no side effects
625                  */
626                 memcpy((void *)a->name, b->name, a->len);
627                 return 0;
628         }
629         return 1;
630 }
631
632 struct dentry_operations cifs_ci_dentry_ops = {
633         .d_revalidate = cifs_d_revalidate,
634         .d_hash = cifs_ci_hash,
635         .d_compare = cifs_ci_compare,
636 };