Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block
[firefly-linux-kernel-4.4.55.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., 2002,2009
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 <linux/mount.h>
28 #include <linux/file.h>
29 #include "cifsfs.h"
30 #include "cifspdu.h"
31 #include "cifsglob.h"
32 #include "cifsproto.h"
33 #include "cifs_debug.h"
34 #include "cifs_fs_sb.h"
35
36 static void
37 renew_parental_timestamps(struct dentry *direntry)
38 {
39         /* BB check if there is a way to get the kernel to do this or if we
40            really need this */
41         do {
42                 direntry->d_time = jiffies;
43                 direntry = direntry->d_parent;
44         } while (!IS_ROOT(direntry));
45 }
46
47 char *
48 cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
49                         struct cifs_tcon *tcon)
50 {
51         int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
52         int dfsplen;
53         char *full_path = NULL;
54
55         /* if no prefix path, simply set path to the root of share to "" */
56         if (pplen == 0) {
57                 full_path = kzalloc(1, GFP_KERNEL);
58                 return full_path;
59         }
60
61         if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
62                 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
63         else
64                 dfsplen = 0;
65
66         full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
67         if (full_path == NULL)
68                 return full_path;
69
70         if (dfsplen)
71                 strncpy(full_path, tcon->treeName, dfsplen);
72         full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
73         strncpy(full_path + dfsplen + 1, vol->prepath, pplen);
74         convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
75         full_path[dfsplen + pplen] = 0; /* add trailing null */
76         return full_path;
77 }
78
79 /* Note: caller must free return buffer */
80 char *
81 build_path_from_dentry(struct dentry *direntry)
82 {
83         struct dentry *temp;
84         int namelen;
85         int dfsplen;
86         char *full_path;
87         char dirsep;
88         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
89         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
90         unsigned seq;
91
92         dirsep = CIFS_DIR_SEP(cifs_sb);
93         if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
94                 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
95         else
96                 dfsplen = 0;
97 cifs_bp_rename_retry:
98         namelen = dfsplen;
99         seq = read_seqbegin(&rename_lock);
100         rcu_read_lock();
101         for (temp = direntry; !IS_ROOT(temp);) {
102                 namelen += (1 + temp->d_name.len);
103                 temp = temp->d_parent;
104                 if (temp == NULL) {
105                         cifs_dbg(VFS, "corrupt dentry\n");
106                         rcu_read_unlock();
107                         return NULL;
108                 }
109         }
110         rcu_read_unlock();
111
112         full_path = kmalloc(namelen+1, GFP_KERNEL);
113         if (full_path == NULL)
114                 return full_path;
115         full_path[namelen] = 0; /* trailing null */
116         rcu_read_lock();
117         for (temp = direntry; !IS_ROOT(temp);) {
118                 spin_lock(&temp->d_lock);
119                 namelen -= 1 + temp->d_name.len;
120                 if (namelen < 0) {
121                         spin_unlock(&temp->d_lock);
122                         break;
123                 } else {
124                         full_path[namelen] = dirsep;
125                         strncpy(full_path + namelen + 1, temp->d_name.name,
126                                 temp->d_name.len);
127                         cifs_dbg(FYI, "name: %s\n", full_path + namelen);
128                 }
129                 spin_unlock(&temp->d_lock);
130                 temp = temp->d_parent;
131                 if (temp == NULL) {
132                         cifs_dbg(VFS, "corrupt dentry\n");
133                         rcu_read_unlock();
134                         kfree(full_path);
135                         return NULL;
136                 }
137         }
138         rcu_read_unlock();
139         if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
140                 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
141                          namelen, dfsplen);
142                 /* presumably this is only possible if racing with a rename
143                 of one of the parent directories  (we can not lock the dentries
144                 above us to prevent this, but retrying should be harmless) */
145                 kfree(full_path);
146                 goto cifs_bp_rename_retry;
147         }
148         /* DIR_SEP already set for byte  0 / vs \ but not for
149            subsequent slashes in prepath which currently must
150            be entered the right way - not sure if there is an alternative
151            since the '\' is a valid posix character so we can not switch
152            those safely to '/' if any are found in the middle of the prepath */
153         /* BB test paths to Windows with '/' in the midst of prepath */
154
155         if (dfsplen) {
156                 strncpy(full_path, tcon->treeName, dfsplen);
157                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
158                         int i;
159                         for (i = 0; i < dfsplen; i++) {
160                                 if (full_path[i] == '\\')
161                                         full_path[i] = '/';
162                         }
163                 }
164         }
165         return full_path;
166 }
167
168 /*
169  * Don't allow the separator character in a path component.
170  * The VFS will not allow "/", but "\" is allowed by posix.
171  */
172 static int
173 check_name(struct dentry *direntry)
174 {
175         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
176         int i;
177
178         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
179                 for (i = 0; i < direntry->d_name.len; i++) {
180                         if (direntry->d_name.name[i] == '\\') {
181                                 cifs_dbg(FYI, "Invalid file name\n");
182                                 return -EINVAL;
183                         }
184                 }
185         }
186         return 0;
187 }
188
189
190 /* Inode operations in similar order to how they appear in Linux file fs.h */
191
192 static int
193 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
194                struct tcon_link *tlink, unsigned oflags, umode_t mode,
195                __u32 *oplock, struct cifs_fid *fid, int *created)
196 {
197         int rc = -ENOENT;
198         int create_options = CREATE_NOT_DIR;
199         int desired_access;
200         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
201         struct cifs_tcon *tcon = tlink_tcon(tlink);
202         char *full_path = NULL;
203         FILE_ALL_INFO *buf = NULL;
204         struct inode *newinode = NULL;
205         int disposition;
206         struct TCP_Server_Info *server = tcon->ses->server;
207
208         *oplock = 0;
209         if (tcon->ses->server->oplocks)
210                 *oplock = REQ_OPLOCK;
211
212         full_path = build_path_from_dentry(direntry);
213         if (full_path == NULL) {
214                 rc = -ENOMEM;
215                 goto out;
216         }
217
218         if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
219             (CIFS_UNIX_POSIX_PATH_OPS_CAP &
220                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
221                 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
222                                      oflags, oplock, &fid->netfid, xid);
223                 switch (rc) {
224                 case 0:
225                         if (newinode == NULL) {
226                                 /* query inode info */
227                                 goto cifs_create_get_file_info;
228                         }
229
230                         if (!S_ISREG(newinode->i_mode)) {
231                                 /*
232                                  * The server may allow us to open things like
233                                  * FIFOs, but the client isn't set up to deal
234                                  * with that. If it's not a regular file, just
235                                  * close it and proceed as if it were a normal
236                                  * lookup.
237                                  */
238                                 CIFSSMBClose(xid, tcon, fid->netfid);
239                                 goto cifs_create_get_file_info;
240                         }
241                         /* success, no need to query */
242                         goto cifs_create_set_dentry;
243
244                 case -ENOENT:
245                         goto cifs_create_get_file_info;
246
247                 case -EIO:
248                 case -EINVAL:
249                         /*
250                          * EIO could indicate that (posix open) operation is not
251                          * supported, despite what server claimed in capability
252                          * negotiation.
253                          *
254                          * POSIX open in samba versions 3.3.1 and earlier could
255                          * incorrectly fail with invalid parameter.
256                          */
257                         tcon->broken_posix_open = true;
258                         break;
259
260                 case -EREMOTE:
261                 case -EOPNOTSUPP:
262                         /*
263                          * EREMOTE indicates DFS junction, which is not handled
264                          * in posix open.  If either that or op not supported
265                          * returned, follow the normal lookup.
266                          */
267                         break;
268
269                 default:
270                         goto out;
271                 }
272                 /*
273                  * fallthrough to retry, using older open call, this is case
274                  * where server does not support this SMB level, and falsely
275                  * claims capability (also get here for DFS case which should be
276                  * rare for path not covered on files)
277                  */
278         }
279
280         desired_access = 0;
281         if (OPEN_FMODE(oflags) & FMODE_READ)
282                 desired_access |= GENERIC_READ; /* is this too little? */
283         if (OPEN_FMODE(oflags) & FMODE_WRITE)
284                 desired_access |= GENERIC_WRITE;
285
286         disposition = FILE_OVERWRITE_IF;
287         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
288                 disposition = FILE_CREATE;
289         else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
290                 disposition = FILE_OVERWRITE_IF;
291         else if ((oflags & O_CREAT) == O_CREAT)
292                 disposition = FILE_OPEN_IF;
293         else
294                 cifs_dbg(FYI, "Create flag not set in create function\n");
295
296         /*
297          * BB add processing to set equivalent of mode - e.g. via CreateX with
298          * ACLs
299          */
300
301         if (!server->ops->open) {
302                 rc = -ENOSYS;
303                 goto out;
304         }
305
306         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
307         if (buf == NULL) {
308                 rc = -ENOMEM;
309                 goto out;
310         }
311
312         /*
313          * if we're not using unix extensions, see if we need to set
314          * ATTR_READONLY on the create call
315          */
316         if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
317                 create_options |= CREATE_OPTION_READONLY;
318
319         if (backup_cred(cifs_sb))
320                 create_options |= CREATE_OPEN_BACKUP_INTENT;
321
322         rc = server->ops->open(xid, tcon, full_path, disposition,
323                                desired_access, create_options, fid, oplock,
324                                buf, cifs_sb);
325         if (rc) {
326                 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
327                 goto out;
328         }
329
330         /*
331          * If Open reported that we actually created a file then we now have to
332          * set the mode if possible.
333          */
334         if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
335                 struct cifs_unix_set_info_args args = {
336                                 .mode   = mode,
337                                 .ctime  = NO_CHANGE_64,
338                                 .atime  = NO_CHANGE_64,
339                                 .mtime  = NO_CHANGE_64,
340                                 .device = 0,
341                 };
342
343                 *created |= FILE_CREATED;
344                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
345                         args.uid = current_fsuid();
346                         if (inode->i_mode & S_ISGID)
347                                 args.gid = inode->i_gid;
348                         else
349                                 args.gid = current_fsgid();
350                 } else {
351                         args.uid = INVALID_UID; /* no change */
352                         args.gid = INVALID_GID; /* no change */
353                 }
354                 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
355                                        current->tgid);
356         } else {
357                 /*
358                  * BB implement mode setting via Windows security
359                  * descriptors e.g.
360                  */
361                 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
362
363                 /* Could set r/o dos attribute if mode & 0222 == 0 */
364         }
365
366 cifs_create_get_file_info:
367         /* server might mask mode so we have to query for it */
368         if (tcon->unix_ext)
369                 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
370                                               xid);
371         else {
372                 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
373                                          xid, &fid->netfid);
374                 if (newinode) {
375                         if (server->ops->set_lease_key)
376                                 server->ops->set_lease_key(newinode, fid);
377                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
378                                 newinode->i_mode = mode;
379                         if ((*oplock & CIFS_CREATE_ACTION) &&
380                             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
381                                 newinode->i_uid = current_fsuid();
382                                 if (inode->i_mode & S_ISGID)
383                                         newinode->i_gid = inode->i_gid;
384                                 else
385                                         newinode->i_gid = current_fsgid();
386                         }
387                 }
388         }
389
390 cifs_create_set_dentry:
391         if (rc != 0) {
392                 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
393                          rc);
394                 if (server->ops->close)
395                         server->ops->close(xid, tcon, fid);
396                 goto out;
397         }
398         d_drop(direntry);
399         d_add(direntry, newinode);
400
401 out:
402         kfree(buf);
403         kfree(full_path);
404         return rc;
405 }
406
407 int
408 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
409                  struct file *file, unsigned oflags, umode_t mode,
410                  int *opened)
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         /*
423          * Posix open is only called (at lookup time) for file create now. For
424          * opens (rather than creates), because we do not know if it is a file
425          * or directory yet, and current Samba no longer allows us to do posix
426          * open on dirs, we could end up wasting an open call on what turns out
427          * to be a dir. For file opens, we wait to call posix open till
428          * cifs_open.  It could be added to atomic_open in the future but the
429          * performance tradeoff of the extra network request when EISDIR or
430          * EACCES is returned would have to be weighed against the 50% reduction
431          * in network traffic in the other paths.
432          */
433         if (!(oflags & O_CREAT)) {
434                 struct dentry *res;
435
436                 /*
437                  * Check for hashed negative dentry. We have already revalidated
438                  * the dentry and it is fine. No need to perform another lookup.
439                  */
440                 if (!d_unhashed(direntry))
441                         return -ENOENT;
442
443                 res = cifs_lookup(inode, direntry, 0);
444                 if (IS_ERR(res))
445                         return PTR_ERR(res);
446
447                 return finish_no_open(file, res);
448         }
449
450         rc = check_name(direntry);
451         if (rc)
452                 return rc;
453
454         xid = get_xid();
455
456         cifs_dbg(FYI, "parent inode = 0x%p name is: %s and dentry = 0x%p\n",
457                  inode, direntry->d_name.name, direntry);
458
459         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
460         if (IS_ERR(tlink)) {
461                 rc = PTR_ERR(tlink);
462                 goto out_free_xid;
463         }
464
465         tcon = tlink_tcon(tlink);
466         server = tcon->ses->server;
467
468         if (server->ops->new_lease_key)
469                 server->ops->new_lease_key(&fid);
470
471         cifs_add_pending_open(&fid, tlink, &open);
472
473         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
474                             &oplock, &fid, opened);
475
476         if (rc) {
477                 cifs_del_pending_open(&open);
478                 goto out;
479         }
480
481         rc = finish_open(file, direntry, generic_file_open, opened);
482         if (rc) {
483                 if (server->ops->close)
484                         server->ops->close(xid, tcon, &fid);
485                 cifs_del_pending_open(&open);
486                 goto out;
487         }
488
489         file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
490         if (file_info == NULL) {
491                 if (server->ops->close)
492                         server->ops->close(xid, tcon, &fid);
493                 cifs_del_pending_open(&open);
494                 rc = -ENOMEM;
495         }
496
497 out:
498         cifs_put_tlink(tlink);
499 out_free_xid:
500         free_xid(xid);
501         return rc;
502 }
503
504 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
505                 bool excl)
506 {
507         int rc;
508         unsigned int xid = get_xid();
509         /*
510          * BB below access is probably too much for mknod to request
511          *    but we have to do query and setpathinfo so requesting
512          *    less could fail (unless we want to request getatr and setatr
513          *    permissions (only).  At least for POSIX we do not have to
514          *    request so much.
515          */
516         unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
517         struct tcon_link *tlink;
518         struct cifs_tcon *tcon;
519         struct TCP_Server_Info *server;
520         struct cifs_fid fid;
521         __u32 oplock;
522         int created = FILE_CREATED;
523
524         cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %s and dentry = 0x%p\n",
525                  inode, direntry->d_name.name, direntry);
526
527         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
528         rc = PTR_ERR(tlink);
529         if (IS_ERR(tlink))
530                 goto out_free_xid;
531
532         tcon = tlink_tcon(tlink);
533         server = tcon->ses->server;
534
535         if (server->ops->new_lease_key)
536                 server->ops->new_lease_key(&fid);
537
538         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
539                             &oplock, &fid, &created);
540         if (!rc && server->ops->close)
541                 server->ops->close(xid, tcon, &fid);
542
543         cifs_put_tlink(tlink);
544 out_free_xid:
545         free_xid(xid);
546         return rc;
547 }
548
549 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
550                 dev_t device_number)
551 {
552         int rc = -EPERM;
553         unsigned int xid;
554         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
555         struct cifs_sb_info *cifs_sb;
556         struct tcon_link *tlink;
557         struct cifs_tcon *pTcon;
558         struct cifs_io_parms io_parms;
559         char *full_path = NULL;
560         struct inode *newinode = NULL;
561         int oplock = 0;
562         u16 fileHandle;
563         FILE_ALL_INFO *buf = NULL;
564         unsigned int bytes_written;
565         struct win_dev *pdev;
566
567         if (!old_valid_dev(device_number))
568                 return -EINVAL;
569
570         cifs_sb = CIFS_SB(inode->i_sb);
571         tlink = cifs_sb_tlink(cifs_sb);
572         if (IS_ERR(tlink))
573                 return PTR_ERR(tlink);
574
575         pTcon = tlink_tcon(tlink);
576
577         xid = get_xid();
578
579         full_path = build_path_from_dentry(direntry);
580         if (full_path == NULL) {
581                 rc = -ENOMEM;
582                 goto mknod_out;
583         }
584
585         if (pTcon->unix_ext) {
586                 struct cifs_unix_set_info_args args = {
587                         .mode   = mode & ~current_umask(),
588                         .ctime  = NO_CHANGE_64,
589                         .atime  = NO_CHANGE_64,
590                         .mtime  = NO_CHANGE_64,
591                         .device = device_number,
592                 };
593                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
594                         args.uid = current_fsuid();
595                         args.gid = current_fsgid();
596                 } else {
597                         args.uid = INVALID_UID; /* no change */
598                         args.gid = INVALID_GID; /* no change */
599                 }
600                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
601                                             cifs_sb->local_nls,
602                                             cifs_sb->mnt_cifs_flags &
603                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
604                 if (rc)
605                         goto mknod_out;
606
607                 rc = cifs_get_inode_info_unix(&newinode, full_path,
608                                                 inode->i_sb, xid);
609
610                 if (rc == 0)
611                         d_instantiate(direntry, newinode);
612                 goto mknod_out;
613         }
614
615         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
616                 goto mknod_out;
617
618
619         cifs_dbg(FYI, "sfu compat create special file\n");
620
621         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
622         if (buf == NULL) {
623                 kfree(full_path);
624                 rc = -ENOMEM;
625                 free_xid(xid);
626                 return rc;
627         }
628
629         if (backup_cred(cifs_sb))
630                 create_options |= CREATE_OPEN_BACKUP_INTENT;
631
632         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
633                          GENERIC_WRITE, create_options,
634                          &fileHandle, &oplock, buf, cifs_sb->local_nls,
635                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
636         if (rc)
637                 goto mknod_out;
638
639         /* BB Do not bother to decode buf since no local inode yet to put
640          * timestamps in, but we can reuse it safely */
641
642         pdev = (struct win_dev *)buf;
643         io_parms.netfid = fileHandle;
644         io_parms.pid = current->tgid;
645         io_parms.tcon = pTcon;
646         io_parms.offset = 0;
647         io_parms.length = sizeof(struct win_dev);
648         if (S_ISCHR(mode)) {
649                 memcpy(pdev->type, "IntxCHR", 8);
650                 pdev->major =
651                       cpu_to_le64(MAJOR(device_number));
652                 pdev->minor =
653                       cpu_to_le64(MINOR(device_number));
654                 rc = CIFSSMBWrite(xid, &io_parms,
655                         &bytes_written, (char *)pdev,
656                         NULL, 0);
657         } else if (S_ISBLK(mode)) {
658                 memcpy(pdev->type, "IntxBLK", 8);
659                 pdev->major =
660                       cpu_to_le64(MAJOR(device_number));
661                 pdev->minor =
662                       cpu_to_le64(MINOR(device_number));
663                 rc = CIFSSMBWrite(xid, &io_parms,
664                         &bytes_written, (char *)pdev,
665                         NULL, 0);
666         } /* else if (S_ISFIFO) */
667         CIFSSMBClose(xid, pTcon, fileHandle);
668         d_drop(direntry);
669
670         /* FIXME: add code here to set EAs */
671
672 mknod_out:
673         kfree(full_path);
674         kfree(buf);
675         free_xid(xid);
676         cifs_put_tlink(tlink);
677         return rc;
678 }
679
680 struct dentry *
681 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
682             unsigned int flags)
683 {
684         unsigned int xid;
685         int rc = 0; /* to get around spurious gcc warning, set to zero here */
686         struct cifs_sb_info *cifs_sb;
687         struct tcon_link *tlink;
688         struct cifs_tcon *pTcon;
689         struct inode *newInode = NULL;
690         char *full_path = NULL;
691
692         xid = get_xid();
693
694         cifs_dbg(FYI, "parent inode = 0x%p name is: %s and dentry = 0x%p\n",
695                  parent_dir_inode, direntry->d_name.name, direntry);
696
697         /* check whether path exists */
698
699         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
700         tlink = cifs_sb_tlink(cifs_sb);
701         if (IS_ERR(tlink)) {
702                 free_xid(xid);
703                 return (struct dentry *)tlink;
704         }
705         pTcon = tlink_tcon(tlink);
706
707         rc = check_name(direntry);
708         if (rc)
709                 goto lookup_out;
710
711         /* can not grab the rename sem here since it would
712         deadlock in the cases (beginning of sys_rename itself)
713         in which we already have the sb rename sem */
714         full_path = build_path_from_dentry(direntry);
715         if (full_path == NULL) {
716                 rc = -ENOMEM;
717                 goto lookup_out;
718         }
719
720         if (direntry->d_inode != NULL) {
721                 cifs_dbg(FYI, "non-NULL inode in lookup\n");
722         } else {
723                 cifs_dbg(FYI, "NULL inode in lookup\n");
724         }
725         cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
726                  full_path, direntry->d_inode);
727
728         if (pTcon->unix_ext) {
729                 rc = cifs_get_inode_info_unix(&newInode, full_path,
730                                               parent_dir_inode->i_sb, xid);
731         } else {
732                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
733                                 parent_dir_inode->i_sb, xid, NULL);
734         }
735
736         if ((rc == 0) && (newInode != NULL)) {
737                 d_add(direntry, newInode);
738                 /* since paths are not looked up by component - the parent
739                    directories are presumed to be good here */
740                 renew_parental_timestamps(direntry);
741
742         } else if (rc == -ENOENT) {
743                 rc = 0;
744                 direntry->d_time = jiffies;
745                 d_add(direntry, NULL);
746         /*      if it was once a directory (but how can we tell?) we could do
747                 shrink_dcache_parent(direntry); */
748         } else if (rc != -EACCES) {
749                 cifs_dbg(VFS, "Unexpected lookup error %d\n", rc);
750                 /* We special case check for Access Denied - since that
751                 is a common return code */
752         }
753
754 lookup_out:
755         kfree(full_path);
756         cifs_put_tlink(tlink);
757         free_xid(xid);
758         return ERR_PTR(rc);
759 }
760
761 static int
762 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
763 {
764         if (flags & LOOKUP_RCU)
765                 return -ECHILD;
766
767         if (direntry->d_inode) {
768                 if (cifs_revalidate_dentry(direntry))
769                         return 0;
770                 else {
771                         /*
772                          * If the inode wasn't known to be a dfs entry when
773                          * the dentry was instantiated, such as when created
774                          * via ->readdir(), it needs to be set now since the
775                          * attributes will have been updated by
776                          * cifs_revalidate_dentry().
777                          */
778                         if (IS_AUTOMOUNT(direntry->d_inode) &&
779                            !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
780                                 spin_lock(&direntry->d_lock);
781                                 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
782                                 spin_unlock(&direntry->d_lock);
783                         }
784
785                         return 1;
786                 }
787         }
788
789         /*
790          * This may be nfsd (or something), anyway, we can't see the
791          * intent of this. So, since this can be for creation, drop it.
792          */
793         if (!flags)
794                 return 0;
795
796         /*
797          * Drop the negative dentry, in order to make sure to use the
798          * case sensitive name which is specified by user if this is
799          * for creation.
800          */
801         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
802                 return 0;
803
804         if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
805                 return 0;
806
807         return 1;
808 }
809
810 /* static int cifs_d_delete(struct dentry *direntry)
811 {
812         int rc = 0;
813
814         cifs_dbg(FYI, "In cifs d_delete, name = %s\n", direntry->d_name.name);
815
816         return rc;
817 }     */
818
819 const struct dentry_operations cifs_dentry_ops = {
820         .d_revalidate = cifs_d_revalidate,
821         .d_automount = cifs_dfs_d_automount,
822 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
823 };
824
825 static int cifs_ci_hash(const struct dentry *dentry, const struct inode *inode,
826                 struct qstr *q)
827 {
828         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
829         unsigned long hash;
830         int i;
831
832         hash = init_name_hash();
833         for (i = 0; i < q->len; i++)
834                 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
835                                          hash);
836         q->hash = end_name_hash(hash);
837
838         return 0;
839 }
840
841 static int cifs_ci_compare(const struct dentry *parent,
842                 const struct inode *pinode,
843                 const struct dentry *dentry, const struct inode *inode,
844                 unsigned int len, const char *str, const struct qstr *name)
845 {
846         struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;
847
848         if ((name->len == len) &&
849             (nls_strnicmp(codepage, name->name, str, len) == 0))
850                 return 0;
851         return 1;
852 }
853
854 const 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 };