Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg...
[linux-2.6] / 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 static void setup_cifs_dentry(struct cifsTconInfo *tcon,
133                               struct dentry *direntry,
134                               struct inode *newinode)
135 {
136         if (tcon->nocase)
137                 direntry->d_op = &cifs_ci_dentry_ops;
138         else
139                 direntry->d_op = &cifs_dentry_ops;
140         d_instantiate(direntry, newinode);
141 }
142
143 /* Inode operations in similar order to how they appear in Linux file fs.h */
144
145 int
146 cifs_create(struct inode *inode, struct dentry *direntry, int mode,
147                 struct nameidata *nd)
148 {
149         int rc = -ENOENT;
150         int xid;
151         int create_options = CREATE_NOT_DIR;
152         int oplock = 0;
153         /* BB below access is too much for the mknod to request */
154         int desiredAccess = GENERIC_READ | GENERIC_WRITE;
155         __u16 fileHandle;
156         struct cifs_sb_info *cifs_sb;
157         struct cifsTconInfo *tcon;
158         char *full_path = NULL;
159         FILE_ALL_INFO *buf = NULL;
160         struct inode *newinode = NULL;
161         struct cifsInodeInfo *pCifsInode;
162         int disposition = FILE_OVERWRITE_IF;
163         bool write_only = false;
164
165         xid = GetXid();
166
167         cifs_sb = CIFS_SB(inode->i_sb);
168         tcon = cifs_sb->tcon;
169
170         full_path = build_path_from_dentry(direntry);
171         if (full_path == NULL) {
172                 FreeXid(xid);
173                 return -ENOMEM;
174         }
175
176         mode &= ~current->fs->umask;
177
178         if (nd && (nd->flags & LOOKUP_OPEN)) {
179                 int oflags = nd->intent.open.flags;
180
181                 desiredAccess = 0;
182                 if (oflags & FMODE_READ)
183                         desiredAccess |= GENERIC_READ;
184                 if (oflags & FMODE_WRITE) {
185                         desiredAccess |= GENERIC_WRITE;
186                         if (!(oflags & FMODE_READ))
187                                 write_only = true;
188                 }
189
190                 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
191                         disposition = FILE_CREATE;
192                 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
193                         disposition = FILE_OVERWRITE_IF;
194                 else if ((oflags & O_CREAT) == O_CREAT)
195                         disposition = FILE_OPEN_IF;
196                 else
197                         cFYI(1, ("Create flag not set in create function"));
198         }
199
200         /* BB add processing to set equivalent of mode - e.g. via CreateX with
201            ACLs */
202         if (oplockEnabled)
203                 oplock = REQ_OPLOCK;
204
205         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
206         if (buf == NULL) {
207                 kfree(full_path);
208                 FreeXid(xid);
209                 return -ENOMEM;
210         }
211
212         /*
213          * if we're not using unix extensions, see if we need to set
214          * ATTR_READONLY on the create call
215          */
216         if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
217                 create_options |= CREATE_OPTION_READONLY;
218
219         if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
220                 rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
221                          desiredAccess, create_options,
222                          &fileHandle, &oplock, buf, cifs_sb->local_nls,
223                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
224         else
225                 rc = -EIO; /* no NT SMB support fall into legacy open below */
226
227         if (rc == -EIO) {
228                 /* old server, retry the open legacy style */
229                 rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
230                         desiredAccess, create_options,
231                         &fileHandle, &oplock, buf, cifs_sb->local_nls,
232                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
233         }
234         if (rc) {
235                 cFYI(1, ("cifs_create returned 0x%x", rc));
236         } else {
237                 /* If Open reported that we actually created a file
238                 then we now have to set the mode if possible */
239                 if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
240                         struct cifs_unix_set_info_args args = {
241                                 .mode   = mode,
242                                 .ctime  = NO_CHANGE_64,
243                                 .atime  = NO_CHANGE_64,
244                                 .mtime  = NO_CHANGE_64,
245                                 .device = 0,
246                         };
247
248                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
249                                 args.uid = (__u64) current_fsuid();
250                                 if (inode->i_mode & S_ISGID)
251                                         args.gid = (__u64) inode->i_gid;
252                                 else
253                                         args.gid = (__u64) current_fsgid();
254                         } else {
255                                 args.uid = NO_CHANGE_64;
256                                 args.gid = NO_CHANGE_64;
257                         }
258                         CIFSSMBUnixSetInfo(xid, tcon, full_path, &args,
259                                 cifs_sb->local_nls,
260                                 cifs_sb->mnt_cifs_flags &
261                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
262                 } else {
263                         /* BB implement mode setting via Windows security
264                            descriptors e.g. */
265                         /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
266
267                         /* Could set r/o dos attribute if mode & 0222 == 0 */
268                 }
269
270                 /* server might mask mode so we have to query for it */
271                 if (tcon->unix_ext)
272                         rc = cifs_get_inode_info_unix(&newinode, full_path,
273                                                  inode->i_sb, xid);
274                 else {
275                         rc = cifs_get_inode_info(&newinode, full_path,
276                                                  buf, inode->i_sb, xid,
277                                                  &fileHandle);
278                         if (newinode) {
279                                 if (cifs_sb->mnt_cifs_flags &
280                                     CIFS_MOUNT_DYNPERM)
281                                         newinode->i_mode = mode;
282                                 if ((oplock & CIFS_CREATE_ACTION) &&
283                                     (cifs_sb->mnt_cifs_flags &
284                                      CIFS_MOUNT_SET_UID)) {
285                                         newinode->i_uid = current_fsuid();
286                                         if (inode->i_mode & S_ISGID)
287                                                 newinode->i_gid =
288                                                         inode->i_gid;
289                                         else
290                                                 newinode->i_gid =
291                                                         current_fsgid();
292                                 }
293                         }
294                 }
295
296                 if (rc != 0) {
297                         cFYI(1, ("Create worked, get_inode_info failed rc = %d",
298                                  rc));
299                 } else
300                         setup_cifs_dentry(tcon, direntry, newinode);
301
302                 if ((nd == NULL /* nfsd case - nfs srv does not set nd */) ||
303                         (!(nd->flags & LOOKUP_OPEN))) {
304                         /* mknod case - do not leave file open */
305                         CIFSSMBClose(xid, tcon, fileHandle);
306                 } else if (newinode) {
307                         struct cifsFileInfo *pCifsFile =
308                            kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
309
310                         if (pCifsFile == NULL)
311                                 goto cifs_create_out;
312                         pCifsFile->netfid = fileHandle;
313                         pCifsFile->pid = current->tgid;
314                         pCifsFile->pInode = newinode;
315                         pCifsFile->invalidHandle = false;
316                         pCifsFile->closePend     = false;
317                         init_MUTEX(&pCifsFile->fh_sem);
318                         mutex_init(&pCifsFile->lock_mutex);
319                         INIT_LIST_HEAD(&pCifsFile->llist);
320                         atomic_set(&pCifsFile->wrtPending, 0);
321
322                         /* set the following in open now
323                                 pCifsFile->pfile = file; */
324                         write_lock(&GlobalSMBSeslock);
325                         list_add(&pCifsFile->tlist, &tcon->openFileList);
326                         pCifsInode = CIFS_I(newinode);
327                         if (pCifsInode) {
328                                 /* if readable file instance put first in list*/
329                                 if (write_only) {
330                                         list_add_tail(&pCifsFile->flist,
331                                                 &pCifsInode->openFileList);
332                                 } else {
333                                         list_add(&pCifsFile->flist,
334                                                 &pCifsInode->openFileList);
335                                 }
336                                 if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
337                                         pCifsInode->clientCanCacheAll = true;
338                                         pCifsInode->clientCanCacheRead = true;
339                                         cFYI(1, ("Exclusive Oplock inode %p",
340                                                 newinode));
341                                 } else if ((oplock & 0xF) == OPLOCK_READ)
342                                         pCifsInode->clientCanCacheRead = true;
343                         }
344                         write_unlock(&GlobalSMBSeslock);
345                 }
346         }
347 cifs_create_out:
348         kfree(buf);
349         kfree(full_path);
350         FreeXid(xid);
351         return rc;
352 }
353
354 int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
355                 dev_t device_number)
356 {
357         int rc = -EPERM;
358         int xid;
359         struct cifs_sb_info *cifs_sb;
360         struct cifsTconInfo *pTcon;
361         char *full_path = NULL;
362         struct inode *newinode = NULL;
363
364         if (!old_valid_dev(device_number))
365                 return -EINVAL;
366
367         xid = GetXid();
368
369         cifs_sb = CIFS_SB(inode->i_sb);
370         pTcon = cifs_sb->tcon;
371
372         full_path = build_path_from_dentry(direntry);
373         if (full_path == NULL)
374                 rc = -ENOMEM;
375         else if (pTcon->unix_ext) {
376                 struct cifs_unix_set_info_args args = {
377                         .mode   = mode & ~current->fs->umask,
378                         .ctime  = NO_CHANGE_64,
379                         .atime  = NO_CHANGE_64,
380                         .mtime  = NO_CHANGE_64,
381                         .device = device_number,
382                 };
383                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
384                         args.uid = (__u64) current_fsuid();
385                         args.gid = (__u64) current_fsgid();
386                 } else {
387                         args.uid = NO_CHANGE_64;
388                         args.gid = NO_CHANGE_64;
389                 }
390                 rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path,
391                         &args, cifs_sb->local_nls,
392                         cifs_sb->mnt_cifs_flags &
393                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
394
395                 if (!rc) {
396                         rc = cifs_get_inode_info_unix(&newinode, full_path,
397                                                 inode->i_sb, xid);
398                         if (pTcon->nocase)
399                                 direntry->d_op = &cifs_ci_dentry_ops;
400                         else
401                                 direntry->d_op = &cifs_dentry_ops;
402                         if (rc == 0)
403                                 d_instantiate(direntry, newinode);
404                 }
405         } else {
406                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
407                         int oplock = 0;
408                         u16 fileHandle;
409                         FILE_ALL_INFO *buf;
410
411                         cFYI(1, ("sfu compat create special file"));
412
413                         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
414                         if (buf == NULL) {
415                                 kfree(full_path);
416                                 FreeXid(xid);
417                                 return -ENOMEM;
418                         }
419
420                         rc = CIFSSMBOpen(xid, pTcon, full_path,
421                                          FILE_CREATE, /* fail if exists */
422                                          GENERIC_WRITE /* BB would
423                                           WRITE_OWNER | WRITE_DAC be better? */,
424                                          /* Create a file and set the
425                                             file attribute to SYSTEM */
426                                          CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
427                                          &fileHandle, &oplock, buf,
428                                          cifs_sb->local_nls,
429                                          cifs_sb->mnt_cifs_flags &
430                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
431
432                         /* BB FIXME - add handling for backlevel servers
433                            which need legacy open and check for all
434                            calls to SMBOpen for fallback to SMBLeagcyOpen */
435                         if (!rc) {
436                                 /* BB Do not bother to decode buf since no
437                                    local inode yet to put timestamps in,
438                                    but we can reuse it safely */
439                                 unsigned int bytes_written;
440                                 struct win_dev *pdev;
441                                 pdev = (struct win_dev *)buf;
442                                 if (S_ISCHR(mode)) {
443                                         memcpy(pdev->type, "IntxCHR", 8);
444                                         pdev->major =
445                                               cpu_to_le64(MAJOR(device_number));
446                                         pdev->minor =
447                                               cpu_to_le64(MINOR(device_number));
448                                         rc = CIFSSMBWrite(xid, pTcon,
449                                                 fileHandle,
450                                                 sizeof(struct win_dev),
451                                                 0, &bytes_written, (char *)pdev,
452                                                 NULL, 0);
453                                 } else if (S_ISBLK(mode)) {
454                                         memcpy(pdev->type, "IntxBLK", 8);
455                                         pdev->major =
456                                               cpu_to_le64(MAJOR(device_number));
457                                         pdev->minor =
458                                               cpu_to_le64(MINOR(device_number));
459                                         rc = CIFSSMBWrite(xid, pTcon,
460                                                 fileHandle,
461                                                 sizeof(struct win_dev),
462                                                 0, &bytes_written, (char *)pdev,
463                                                 NULL, 0);
464                                 } /* else if(S_ISFIFO */
465                                 CIFSSMBClose(xid, pTcon, fileHandle);
466                                 d_drop(direntry);
467                         }
468                         kfree(buf);
469                         /* add code here to set EAs */
470                 }
471         }
472
473         kfree(full_path);
474         FreeXid(xid);
475         return rc;
476 }
477
478
479 struct dentry *
480 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
481             struct nameidata *nd)
482 {
483         int xid;
484         int rc = 0; /* to get around spurious gcc warning, set to zero here */
485         struct cifs_sb_info *cifs_sb;
486         struct cifsTconInfo *pTcon;
487         struct inode *newInode = NULL;
488         char *full_path = NULL;
489
490         xid = GetXid();
491
492         cFYI(1, ("parent inode = 0x%p name is: %s and dentry = 0x%p",
493               parent_dir_inode, direntry->d_name.name, direntry));
494
495         /* check whether path exists */
496
497         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
498         pTcon = cifs_sb->tcon;
499
500         /*
501          * Don't allow the separator character in a path component.
502          * The VFS will not allow "/", but "\" is allowed by posix.
503          */
504         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
505                 int i;
506                 for (i = 0; i < direntry->d_name.len; i++)
507                         if (direntry->d_name.name[i] == '\\') {
508                                 cFYI(1, ("Invalid file name"));
509                                 FreeXid(xid);
510                                 return ERR_PTR(-EINVAL);
511                         }
512         }
513
514         /* can not grab the rename sem here since it would
515         deadlock in the cases (beginning of sys_rename itself)
516         in which we already have the sb rename sem */
517         full_path = build_path_from_dentry(direntry);
518         if (full_path == NULL) {
519                 FreeXid(xid);
520                 return ERR_PTR(-ENOMEM);
521         }
522
523         if (direntry->d_inode != NULL) {
524                 cFYI(1, ("non-NULL inode in lookup"));
525         } else {
526                 cFYI(1, ("NULL inode in lookup"));
527         }
528         cFYI(1, ("Full path: %s inode = 0x%p", full_path, direntry->d_inode));
529
530         if (pTcon->unix_ext)
531                 rc = cifs_get_inode_info_unix(&newInode, full_path,
532                                               parent_dir_inode->i_sb, xid);
533         else
534                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
535                                          parent_dir_inode->i_sb, xid, NULL);
536
537         if ((rc == 0) && (newInode != NULL)) {
538                 if (pTcon->nocase)
539                         direntry->d_op = &cifs_ci_dentry_ops;
540                 else
541                         direntry->d_op = &cifs_dentry_ops;
542                 d_add(direntry, newInode);
543
544                 /* since paths are not looked up by component - the parent
545                    directories are presumed to be good here */
546                 renew_parental_timestamps(direntry);
547
548         } else if (rc == -ENOENT) {
549                 rc = 0;
550                 direntry->d_time = jiffies;
551                 if (pTcon->nocase)
552                         direntry->d_op = &cifs_ci_dentry_ops;
553                 else
554                         direntry->d_op = &cifs_dentry_ops;
555                 d_add(direntry, NULL);
556         /*      if it was once a directory (but how can we tell?) we could do
557                 shrink_dcache_parent(direntry); */
558         } else if (rc != -EACCES) {
559                 cERROR(1, ("Unexpected lookup error %d", rc));
560                 /* We special case check for Access Denied - since that
561                 is a common return code */
562         }
563
564         kfree(full_path);
565         FreeXid(xid);
566         return ERR_PTR(rc);
567 }
568
569 static int
570 cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
571 {
572         int isValid = 1;
573
574         if (direntry->d_inode) {
575                 if (cifs_revalidate(direntry))
576                         return 0;
577         } else {
578                 cFYI(1, ("neg dentry 0x%p name = %s",
579                          direntry, direntry->d_name.name));
580                 if (time_after(jiffies, direntry->d_time + HZ) ||
581                         !lookupCacheEnabled) {
582                         d_drop(direntry);
583                         isValid = 0;
584                 }
585         }
586
587         return isValid;
588 }
589
590 /* static int cifs_d_delete(struct dentry *direntry)
591 {
592         int rc = 0;
593
594         cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
595
596         return rc;
597 }     */
598
599 struct dentry_operations cifs_dentry_ops = {
600         .d_revalidate = cifs_d_revalidate,
601 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
602 };
603
604 static int cifs_ci_hash(struct dentry *dentry, struct qstr *q)
605 {
606         struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
607         unsigned long hash;
608         int i;
609
610         hash = init_name_hash();
611         for (i = 0; i < q->len; i++)
612                 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
613                                          hash);
614         q->hash = end_name_hash(hash);
615
616         return 0;
617 }
618
619 static int cifs_ci_compare(struct dentry *dentry, struct qstr *a,
620                            struct qstr *b)
621 {
622         struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
623
624         if ((a->len == b->len) &&
625             (nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
626                 /*
627                  * To preserve case, don't let an existing negative dentry's
628                  * case take precedence.  If a is not a negative dentry, this
629                  * should have no side effects
630                  */
631                 memcpy((void *)a->name, b->name, a->len);
632                 return 0;
633         }
634         return 1;
635 }
636
637 struct dentry_operations cifs_ci_dentry_ops = {
638         .d_revalidate = cifs_d_revalidate,
639         .d_hash = cifs_ci_hash,
640         .d_compare = cifs_ci_compare,
641 };