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TOMOYO Linux Cross Reference
Linux/fs/cifs/dir.c

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  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 #include "cifs_unicode.h"
 36 
 37 static void
 38 renew_parental_timestamps(struct dentry *direntry)
 39 {
 40         /* BB check if there is a way to get the kernel to do this or if we
 41            really need this */
 42         do {
 43                 cifs_set_time(direntry, jiffies);
 44                 direntry = direntry->d_parent;
 45         } while (!IS_ROOT(direntry));
 46 }
 47 
 48 char *
 49 cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
 50                         struct cifs_tcon *tcon, int add_treename)
 51 {
 52         int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
 53         int dfsplen;
 54         char *full_path = NULL;
 55 
 56         /* if no prefix path, simply set path to the root of share to "" */
 57         if (pplen == 0) {
 58                 full_path = kzalloc(1, GFP_KERNEL);
 59                 return full_path;
 60         }
 61 
 62         if (add_treename)
 63                 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
 64         else
 65                 dfsplen = 0;
 66 
 67         full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
 68         if (full_path == NULL)
 69                 return full_path;
 70 
 71         if (dfsplen)
 72                 strncpy(full_path, tcon->treeName, dfsplen);
 73         full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
 74         strncpy(full_path + dfsplen + 1, vol->prepath, pplen);
 75         convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
 76         full_path[dfsplen + pplen] = 0; /* add trailing null */
 77         return full_path;
 78 }
 79 
 80 /* Note: caller must free return buffer */
 81 char *
 82 build_path_from_dentry(struct dentry *direntry)
 83 {
 84         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
 85         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 86         bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
 87 
 88         return build_path_from_dentry_optional_prefix(direntry,
 89                                                       prefix);
 90 }
 91 
 92 char *
 93 build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix)
 94 {
 95         struct dentry *temp;
 96         int namelen;
 97         int dfsplen;
 98         int pplen = 0;
 99         char *full_path;
100         char dirsep;
101         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
102         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
103         unsigned seq;
104 
105         dirsep = CIFS_DIR_SEP(cifs_sb);
106         if (prefix)
107                 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
108         else
109                 dfsplen = 0;
110 
111         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
112                 pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
113 
114 cifs_bp_rename_retry:
115         namelen = dfsplen + pplen;
116         seq = read_seqbegin(&rename_lock);
117         rcu_read_lock();
118         for (temp = direntry; !IS_ROOT(temp);) {
119                 namelen += (1 + temp->d_name.len);
120                 temp = temp->d_parent;
121                 if (temp == NULL) {
122                         cifs_dbg(VFS, "corrupt dentry\n");
123                         rcu_read_unlock();
124                         return NULL;
125                 }
126         }
127         rcu_read_unlock();
128 
129         full_path = kmalloc(namelen+1, GFP_KERNEL);
130         if (full_path == NULL)
131                 return full_path;
132         full_path[namelen] = 0; /* trailing null */
133         rcu_read_lock();
134         for (temp = direntry; !IS_ROOT(temp);) {
135                 spin_lock(&temp->d_lock);
136                 namelen -= 1 + temp->d_name.len;
137                 if (namelen < 0) {
138                         spin_unlock(&temp->d_lock);
139                         break;
140                 } else {
141                         full_path[namelen] = dirsep;
142                         strncpy(full_path + namelen + 1, temp->d_name.name,
143                                 temp->d_name.len);
144                         cifs_dbg(FYI, "name: %s\n", full_path + namelen);
145                 }
146                 spin_unlock(&temp->d_lock);
147                 temp = temp->d_parent;
148                 if (temp == NULL) {
149                         cifs_dbg(VFS, "corrupt dentry\n");
150                         rcu_read_unlock();
151                         kfree(full_path);
152                         return NULL;
153                 }
154         }
155         rcu_read_unlock();
156         if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) {
157                 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
158                          namelen, dfsplen);
159                 /* presumably this is only possible if racing with a rename
160                 of one of the parent directories  (we can not lock the dentries
161                 above us to prevent this, but retrying should be harmless) */
162                 kfree(full_path);
163                 goto cifs_bp_rename_retry;
164         }
165         /* DIR_SEP already set for byte  0 / vs \ but not for
166            subsequent slashes in prepath which currently must
167            be entered the right way - not sure if there is an alternative
168            since the '\' is a valid posix character so we can not switch
169            those safely to '/' if any are found in the middle of the prepath */
170         /* BB test paths to Windows with '/' in the midst of prepath */
171 
172         if (pplen) {
173                 int i;
174 
175                 cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
176                 memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1);
177                 full_path[dfsplen] = '\\';
178                 for (i = 0; i < pplen-1; i++)
179                         if (full_path[dfsplen+1+i] == '/')
180                                 full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb);
181         }
182 
183         if (dfsplen) {
184                 strncpy(full_path, tcon->treeName, dfsplen);
185                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
186                         int i;
187                         for (i = 0; i < dfsplen; i++) {
188                                 if (full_path[i] == '\\')
189                                         full_path[i] = '/';
190                         }
191                 }
192         }
193         return full_path;
194 }
195 
196 /*
197  * Don't allow the separator character in a path component.
198  * The VFS will not allow "/", but "\" is allowed by posix.
199  */
200 static int
201 check_name(struct dentry *direntry)
202 {
203         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
204         int i;
205 
206         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
207                 for (i = 0; i < direntry->d_name.len; i++) {
208                         if (direntry->d_name.name[i] == '\\') {
209                                 cifs_dbg(FYI, "Invalid file name\n");
210                                 return -EINVAL;
211                         }
212                 }
213         }
214         return 0;
215 }
216 
217 
218 /* Inode operations in similar order to how they appear in Linux file fs.h */
219 
220 static int
221 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
222                struct tcon_link *tlink, unsigned oflags, umode_t mode,
223                __u32 *oplock, struct cifs_fid *fid)
224 {
225         int rc = -ENOENT;
226         int create_options = CREATE_NOT_DIR;
227         int desired_access;
228         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
229         struct cifs_tcon *tcon = tlink_tcon(tlink);
230         char *full_path = NULL;
231         FILE_ALL_INFO *buf = NULL;
232         struct inode *newinode = NULL;
233         int disposition;
234         struct TCP_Server_Info *server = tcon->ses->server;
235         struct cifs_open_parms oparms;
236 
237         *oplock = 0;
238         if (tcon->ses->server->oplocks)
239                 *oplock = REQ_OPLOCK;
240 
241         full_path = build_path_from_dentry(direntry);
242         if (full_path == NULL) {
243                 rc = -ENOMEM;
244                 goto out;
245         }
246 
247         if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
248             (CIFS_UNIX_POSIX_PATH_OPS_CAP &
249                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
250                 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
251                                      oflags, oplock, &fid->netfid, xid);
252                 switch (rc) {
253                 case 0:
254                         if (newinode == NULL) {
255                                 /* query inode info */
256                                 goto cifs_create_get_file_info;
257                         }
258 
259                         if (S_ISDIR(newinode->i_mode)) {
260                                 CIFSSMBClose(xid, tcon, fid->netfid);
261                                 iput(newinode);
262                                 rc = -EISDIR;
263                                 goto out;
264                         }
265 
266                         if (!S_ISREG(newinode->i_mode)) {
267                                 /*
268                                  * The server may allow us to open things like
269                                  * FIFOs, but the client isn't set up to deal
270                                  * with that. If it's not a regular file, just
271                                  * close it and proceed as if it were a normal
272                                  * lookup.
273                                  */
274                                 CIFSSMBClose(xid, tcon, fid->netfid);
275                                 goto cifs_create_get_file_info;
276                         }
277                         /* success, no need to query */
278                         goto cifs_create_set_dentry;
279 
280                 case -ENOENT:
281                         goto cifs_create_get_file_info;
282 
283                 case -EIO:
284                 case -EINVAL:
285                         /*
286                          * EIO could indicate that (posix open) operation is not
287                          * supported, despite what server claimed in capability
288                          * negotiation.
289                          *
290                          * POSIX open in samba versions 3.3.1 and earlier could
291                          * incorrectly fail with invalid parameter.
292                          */
293                         tcon->broken_posix_open = true;
294                         break;
295 
296                 case -EREMOTE:
297                 case -EOPNOTSUPP:
298                         /*
299                          * EREMOTE indicates DFS junction, which is not handled
300                          * in posix open.  If either that or op not supported
301                          * returned, follow the normal lookup.
302                          */
303                         break;
304 
305                 default:
306                         goto out;
307                 }
308                 /*
309                  * fallthrough to retry, using older open call, this is case
310                  * where server does not support this SMB level, and falsely
311                  * claims capability (also get here for DFS case which should be
312                  * rare for path not covered on files)
313                  */
314         }
315 
316         desired_access = 0;
317         if (OPEN_FMODE(oflags) & FMODE_READ)
318                 desired_access |= GENERIC_READ; /* is this too little? */
319         if (OPEN_FMODE(oflags) & FMODE_WRITE)
320                 desired_access |= GENERIC_WRITE;
321 
322         disposition = FILE_OVERWRITE_IF;
323         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
324                 disposition = FILE_CREATE;
325         else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
326                 disposition = FILE_OVERWRITE_IF;
327         else if ((oflags & O_CREAT) == O_CREAT)
328                 disposition = FILE_OPEN_IF;
329         else
330                 cifs_dbg(FYI, "Create flag not set in create function\n");
331 
332         /*
333          * BB add processing to set equivalent of mode - e.g. via CreateX with
334          * ACLs
335          */
336 
337         if (!server->ops->open) {
338                 rc = -ENOSYS;
339                 goto out;
340         }
341 
342         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
343         if (buf == NULL) {
344                 rc = -ENOMEM;
345                 goto out;
346         }
347 
348         /*
349          * if we're not using unix extensions, see if we need to set
350          * ATTR_READONLY on the create call
351          */
352         if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
353                 create_options |= CREATE_OPTION_READONLY;
354 
355         if (backup_cred(cifs_sb))
356                 create_options |= CREATE_OPEN_BACKUP_INTENT;
357 
358         oparms.tcon = tcon;
359         oparms.cifs_sb = cifs_sb;
360         oparms.desired_access = desired_access;
361         oparms.create_options = create_options;
362         oparms.disposition = disposition;
363         oparms.path = full_path;
364         oparms.fid = fid;
365         oparms.reconnect = false;
366 
367         rc = server->ops->open(xid, &oparms, oplock, buf);
368         if (rc) {
369                 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
370                 goto out;
371         }
372 
373         /*
374          * If Open reported that we actually created a file then we now have to
375          * set the mode if possible.
376          */
377         if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
378                 struct cifs_unix_set_info_args args = {
379                                 .mode   = mode,
380                                 .ctime  = NO_CHANGE_64,
381                                 .atime  = NO_CHANGE_64,
382                                 .mtime  = NO_CHANGE_64,
383                                 .device = 0,
384                 };
385 
386                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
387                         args.uid = current_fsuid();
388                         if (inode->i_mode & S_ISGID)
389                                 args.gid = inode->i_gid;
390                         else
391                                 args.gid = current_fsgid();
392                 } else {
393                         args.uid = INVALID_UID; /* no change */
394                         args.gid = INVALID_GID; /* no change */
395                 }
396                 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
397                                        current->tgid);
398         } else {
399                 /*
400                  * BB implement mode setting via Windows security
401                  * descriptors e.g.
402                  */
403                 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
404 
405                 /* Could set r/o dos attribute if mode & 0222 == 0 */
406         }
407 
408 cifs_create_get_file_info:
409         /* server might mask mode so we have to query for it */
410         if (tcon->unix_ext)
411                 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
412                                               xid);
413         else {
414                 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
415                                          xid, fid);
416                 if (newinode) {
417                         if (server->ops->set_lease_key)
418                                 server->ops->set_lease_key(newinode, fid);
419                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
420                                 newinode->i_mode = mode;
421                         if ((*oplock & CIFS_CREATE_ACTION) &&
422                             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
423                                 newinode->i_uid = current_fsuid();
424                                 if (inode->i_mode & S_ISGID)
425                                         newinode->i_gid = inode->i_gid;
426                                 else
427                                         newinode->i_gid = current_fsgid();
428                         }
429                 }
430         }
431 
432 cifs_create_set_dentry:
433         if (rc != 0) {
434                 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
435                          rc);
436                 goto out_err;
437         }
438 
439         if (S_ISDIR(newinode->i_mode)) {
440                 rc = -EISDIR;
441                 goto out_err;
442         }
443 
444         d_drop(direntry);
445         d_add(direntry, newinode);
446 
447 out:
448         kfree(buf);
449         kfree(full_path);
450         return rc;
451 
452 out_err:
453         if (server->ops->close)
454                 server->ops->close(xid, tcon, fid);
455         if (newinode)
456                 iput(newinode);
457         goto out;
458 }
459 
460 int
461 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
462                  struct file *file, unsigned oflags, umode_t mode,
463                  int *opened)
464 {
465         int rc;
466         unsigned int xid;
467         struct tcon_link *tlink;
468         struct cifs_tcon *tcon;
469         struct TCP_Server_Info *server;
470         struct cifs_fid fid;
471         struct cifs_pending_open open;
472         __u32 oplock;
473         struct cifsFileInfo *file_info;
474 
475         /*
476          * Posix open is only called (at lookup time) for file create now. For
477          * opens (rather than creates), because we do not know if it is a file
478          * or directory yet, and current Samba no longer allows us to do posix
479          * open on dirs, we could end up wasting an open call on what turns out
480          * to be a dir. For file opens, we wait to call posix open till
481          * cifs_open.  It could be added to atomic_open in the future but the
482          * performance tradeoff of the extra network request when EISDIR or
483          * EACCES is returned would have to be weighed against the 50% reduction
484          * in network traffic in the other paths.
485          */
486         if (!(oflags & O_CREAT)) {
487                 struct dentry *res;
488 
489                 /*
490                  * Check for hashed negative dentry. We have already revalidated
491                  * the dentry and it is fine. No need to perform another lookup.
492                  */
493                 if (!d_in_lookup(direntry))
494                         return -ENOENT;
495 
496                 res = cifs_lookup(inode, direntry, 0);
497                 if (IS_ERR(res))
498                         return PTR_ERR(res);
499 
500                 return finish_no_open(file, res);
501         }
502 
503         rc = check_name(direntry);
504         if (rc)
505                 return rc;
506 
507         xid = get_xid();
508 
509         cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
510                  inode, direntry, direntry);
511 
512         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
513         if (IS_ERR(tlink)) {
514                 rc = PTR_ERR(tlink);
515                 goto out_free_xid;
516         }
517 
518         tcon = tlink_tcon(tlink);
519         server = tcon->ses->server;
520 
521         if (server->ops->new_lease_key)
522                 server->ops->new_lease_key(&fid);
523 
524         cifs_add_pending_open(&fid, tlink, &open);
525 
526         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
527                             &oplock, &fid);
528 
529         if (rc) {
530                 cifs_del_pending_open(&open);
531                 goto out;
532         }
533 
534         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
535                 *opened |= FILE_CREATED;
536 
537         rc = finish_open(file, direntry, generic_file_open, opened);
538         if (rc) {
539                 if (server->ops->close)
540                         server->ops->close(xid, tcon, &fid);
541                 cifs_del_pending_open(&open);
542                 goto out;
543         }
544 
545         if (file->f_flags & O_DIRECT &&
546             CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
547                 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
548                         file->f_op = &cifs_file_direct_nobrl_ops;
549                 else
550                         file->f_op = &cifs_file_direct_ops;
551                 }
552 
553         file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
554         if (file_info == NULL) {
555                 if (server->ops->close)
556                         server->ops->close(xid, tcon, &fid);
557                 cifs_del_pending_open(&open);
558                 fput(file);
559                 rc = -ENOMEM;
560         }
561 
562 out:
563         cifs_put_tlink(tlink);
564 out_free_xid:
565         free_xid(xid);
566         return rc;
567 }
568 
569 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
570                 bool excl)
571 {
572         int rc;
573         unsigned int xid = get_xid();
574         /*
575          * BB below access is probably too much for mknod to request
576          *    but we have to do query and setpathinfo so requesting
577          *    less could fail (unless we want to request getatr and setatr
578          *    permissions (only).  At least for POSIX we do not have to
579          *    request so much.
580          */
581         unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
582         struct tcon_link *tlink;
583         struct cifs_tcon *tcon;
584         struct TCP_Server_Info *server;
585         struct cifs_fid fid;
586         __u32 oplock;
587 
588         cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
589                  inode, direntry, direntry);
590 
591         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
592         rc = PTR_ERR(tlink);
593         if (IS_ERR(tlink))
594                 goto out_free_xid;
595 
596         tcon = tlink_tcon(tlink);
597         server = tcon->ses->server;
598 
599         if (server->ops->new_lease_key)
600                 server->ops->new_lease_key(&fid);
601 
602         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
603                             &oplock, &fid);
604         if (!rc && server->ops->close)
605                 server->ops->close(xid, tcon, &fid);
606 
607         cifs_put_tlink(tlink);
608 out_free_xid:
609         free_xid(xid);
610         return rc;
611 }
612 
613 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
614                 dev_t device_number)
615 {
616         int rc = -EPERM;
617         unsigned int xid;
618         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
619         struct cifs_sb_info *cifs_sb;
620         struct tcon_link *tlink;
621         struct cifs_tcon *tcon;
622         struct cifs_io_parms io_parms;
623         char *full_path = NULL;
624         struct inode *newinode = NULL;
625         __u32 oplock = 0;
626         struct cifs_fid fid;
627         struct cifs_open_parms oparms;
628         FILE_ALL_INFO *buf = NULL;
629         unsigned int bytes_written;
630         struct win_dev *pdev;
631         struct kvec iov[2];
632 
633         if (!old_valid_dev(device_number))
634                 return -EINVAL;
635 
636         cifs_sb = CIFS_SB(inode->i_sb);
637         tlink = cifs_sb_tlink(cifs_sb);
638         if (IS_ERR(tlink))
639                 return PTR_ERR(tlink);
640 
641         tcon = tlink_tcon(tlink);
642 
643         xid = get_xid();
644 
645         full_path = build_path_from_dentry(direntry);
646         if (full_path == NULL) {
647                 rc = -ENOMEM;
648                 goto mknod_out;
649         }
650 
651         if (tcon->unix_ext) {
652                 struct cifs_unix_set_info_args args = {
653                         .mode   = mode & ~current_umask(),
654                         .ctime  = NO_CHANGE_64,
655                         .atime  = NO_CHANGE_64,
656                         .mtime  = NO_CHANGE_64,
657                         .device = device_number,
658                 };
659                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
660                         args.uid = current_fsuid();
661                         args.gid = current_fsgid();
662                 } else {
663                         args.uid = INVALID_UID; /* no change */
664                         args.gid = INVALID_GID; /* no change */
665                 }
666                 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
667                                             cifs_sb->local_nls,
668                                             cifs_remap(cifs_sb));
669                 if (rc)
670                         goto mknod_out;
671 
672                 rc = cifs_get_inode_info_unix(&newinode, full_path,
673                                                 inode->i_sb, xid);
674 
675                 if (rc == 0)
676                         d_instantiate(direntry, newinode);
677                 goto mknod_out;
678         }
679 
680         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
681                 goto mknod_out;
682 
683 
684         cifs_dbg(FYI, "sfu compat create special file\n");
685 
686         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
687         if (buf == NULL) {
688                 kfree(full_path);
689                 rc = -ENOMEM;
690                 free_xid(xid);
691                 return rc;
692         }
693 
694         if (backup_cred(cifs_sb))
695                 create_options |= CREATE_OPEN_BACKUP_INTENT;
696 
697         oparms.tcon = tcon;
698         oparms.cifs_sb = cifs_sb;
699         oparms.desired_access = GENERIC_WRITE;
700         oparms.create_options = create_options;
701         oparms.disposition = FILE_CREATE;
702         oparms.path = full_path;
703         oparms.fid = &fid;
704         oparms.reconnect = false;
705 
706         if (tcon->ses->server->oplocks)
707                 oplock = REQ_OPLOCK;
708         else
709                 oplock = 0;
710         rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
711         if (rc)
712                 goto mknod_out;
713 
714         /*
715          * BB Do not bother to decode buf since no local inode yet to put
716          * timestamps in, but we can reuse it safely.
717          */
718 
719         pdev = (struct win_dev *)buf;
720         io_parms.pid = current->tgid;
721         io_parms.tcon = tcon;
722         io_parms.offset = 0;
723         io_parms.length = sizeof(struct win_dev);
724         iov[1].iov_base = buf;
725         iov[1].iov_len = sizeof(struct win_dev);
726         if (S_ISCHR(mode)) {
727                 memcpy(pdev->type, "IntxCHR", 8);
728                 pdev->major = cpu_to_le64(MAJOR(device_number));
729                 pdev->minor = cpu_to_le64(MINOR(device_number));
730                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
731                                                         &bytes_written, iov, 1);
732         } else if (S_ISBLK(mode)) {
733                 memcpy(pdev->type, "IntxBLK", 8);
734                 pdev->major = cpu_to_le64(MAJOR(device_number));
735                 pdev->minor = cpu_to_le64(MINOR(device_number));
736                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
737                                                         &bytes_written, iov, 1);
738         } /* else if (S_ISFIFO) */
739         tcon->ses->server->ops->close(xid, tcon, &fid);
740         d_drop(direntry);
741 
742         /* FIXME: add code here to set EAs */
743 
744 mknod_out:
745         kfree(full_path);
746         kfree(buf);
747         free_xid(xid);
748         cifs_put_tlink(tlink);
749         return rc;
750 }
751 
752 struct dentry *
753 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
754             unsigned int flags)
755 {
756         unsigned int xid;
757         int rc = 0; /* to get around spurious gcc warning, set to zero here */
758         struct cifs_sb_info *cifs_sb;
759         struct tcon_link *tlink;
760         struct cifs_tcon *pTcon;
761         struct inode *newInode = NULL;
762         char *full_path = NULL;
763 
764         xid = get_xid();
765 
766         cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
767                  parent_dir_inode, direntry, direntry);
768 
769         /* check whether path exists */
770 
771         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
772         tlink = cifs_sb_tlink(cifs_sb);
773         if (IS_ERR(tlink)) {
774                 free_xid(xid);
775                 return (struct dentry *)tlink;
776         }
777         pTcon = tlink_tcon(tlink);
778 
779         rc = check_name(direntry);
780         if (rc)
781                 goto lookup_out;
782 
783         /* can not grab the rename sem here since it would
784         deadlock in the cases (beginning of sys_rename itself)
785         in which we already have the sb rename sem */
786         full_path = build_path_from_dentry(direntry);
787         if (full_path == NULL) {
788                 rc = -ENOMEM;
789                 goto lookup_out;
790         }
791 
792         if (d_really_is_positive(direntry)) {
793                 cifs_dbg(FYI, "non-NULL inode in lookup\n");
794         } else {
795                 cifs_dbg(FYI, "NULL inode in lookup\n");
796         }
797         cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
798                  full_path, d_inode(direntry));
799 
800         if (pTcon->unix_ext) {
801                 rc = cifs_get_inode_info_unix(&newInode, full_path,
802                                               parent_dir_inode->i_sb, xid);
803         } else {
804                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
805                                 parent_dir_inode->i_sb, xid, NULL);
806         }
807 
808         if ((rc == 0) && (newInode != NULL)) {
809                 d_add(direntry, newInode);
810                 /* since paths are not looked up by component - the parent
811                    directories are presumed to be good here */
812                 renew_parental_timestamps(direntry);
813 
814         } else if (rc == -ENOENT) {
815                 rc = 0;
816                 cifs_set_time(direntry, jiffies);
817                 d_add(direntry, NULL);
818         /*      if it was once a directory (but how can we tell?) we could do
819                 shrink_dcache_parent(direntry); */
820         } else if (rc != -EACCES) {
821                 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
822                 /* We special case check for Access Denied - since that
823                 is a common return code */
824         }
825 
826 lookup_out:
827         kfree(full_path);
828         cifs_put_tlink(tlink);
829         free_xid(xid);
830         return ERR_PTR(rc);
831 }
832 
833 static int
834 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
835 {
836         if (flags & LOOKUP_RCU)
837                 return -ECHILD;
838 
839         if (d_really_is_positive(direntry)) {
840                 if (cifs_revalidate_dentry(direntry))
841                         return 0;
842                 else {
843                         /*
844                          * If the inode wasn't known to be a dfs entry when
845                          * the dentry was instantiated, such as when created
846                          * via ->readdir(), it needs to be set now since the
847                          * attributes will have been updated by
848                          * cifs_revalidate_dentry().
849                          */
850                         if (IS_AUTOMOUNT(d_inode(direntry)) &&
851                            !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
852                                 spin_lock(&direntry->d_lock);
853                                 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
854                                 spin_unlock(&direntry->d_lock);
855                         }
856 
857                         return 1;
858                 }
859         }
860 
861         /*
862          * This may be nfsd (or something), anyway, we can't see the
863          * intent of this. So, since this can be for creation, drop it.
864          */
865         if (!flags)
866                 return 0;
867 
868         /*
869          * Drop the negative dentry, in order to make sure to use the
870          * case sensitive name which is specified by user if this is
871          * for creation.
872          */
873         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
874                 return 0;
875 
876         if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
877                 return 0;
878 
879         return 1;
880 }
881 
882 /* static int cifs_d_delete(struct dentry *direntry)
883 {
884         int rc = 0;
885 
886         cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
887 
888         return rc;
889 }     */
890 
891 const struct dentry_operations cifs_dentry_ops = {
892         .d_revalidate = cifs_d_revalidate,
893         .d_automount = cifs_dfs_d_automount,
894 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
895 };
896 
897 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
898 {
899         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
900         unsigned long hash;
901         wchar_t c;
902         int i, charlen;
903 
904         hash = init_name_hash(dentry);
905         for (i = 0; i < q->len; i += charlen) {
906                 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
907                 /* error out if we can't convert the character */
908                 if (unlikely(charlen < 0))
909                         return charlen;
910                 hash = partial_name_hash(cifs_toupper(c), hash);
911         }
912         q->hash = end_name_hash(hash);
913 
914         return 0;
915 }
916 
917 static int cifs_ci_compare(const struct dentry *dentry,
918                 unsigned int len, const char *str, const struct qstr *name)
919 {
920         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
921         wchar_t c1, c2;
922         int i, l1, l2;
923 
924         /*
925          * We make the assumption here that uppercase characters in the local
926          * codepage are always the same length as their lowercase counterparts.
927          *
928          * If that's ever not the case, then this will fail to match it.
929          */
930         if (name->len != len)
931                 return 1;
932 
933         for (i = 0; i < len; i += l1) {
934                 /* Convert characters in both strings to UTF-16. */
935                 l1 = codepage->char2uni(&str[i], len - i, &c1);
936                 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
937 
938                 /*
939                  * If we can't convert either character, just declare it to
940                  * be 1 byte long and compare the original byte.
941                  */
942                 if (unlikely(l1 < 0 && l2 < 0)) {
943                         if (str[i] != name->name[i])
944                                 return 1;
945                         l1 = 1;
946                         continue;
947                 }
948 
949                 /*
950                  * Here, we again ass|u|me that upper/lowercase versions of
951                  * a character are the same length in the local NLS.
952                  */
953                 if (l1 != l2)
954                         return 1;
955 
956                 /* Now compare uppercase versions of these characters */
957                 if (cifs_toupper(c1) != cifs_toupper(c2))
958                         return 1;
959         }
960 
961         return 0;
962 }
963 
964 const struct dentry_operations cifs_ci_dentry_ops = {
965         .d_revalidate = cifs_d_revalidate,
966         .d_hash = cifs_ci_hash,
967         .d_compare = cifs_ci_compare,
968         .d_automount = cifs_dfs_d_automount,
969 };
970 

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