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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 path components longer than the server max.
198  * Don't allow the separator character in a path component.
199  * The VFS will not allow "/", but "\" is allowed by posix.
200  */
201 static int
202 check_name(struct dentry *direntry, struct cifs_tcon *tcon)
203 {
204         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
205         int i;
206 
207         if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
208                      direntry->d_name.len >
209                      le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
210                 return -ENAMETOOLONG;
211 
212         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
213                 for (i = 0; i < direntry->d_name.len; i++) {
214                         if (direntry->d_name.name[i] == '\\') {
215                                 cifs_dbg(FYI, "Invalid file name\n");
216                                 return -EINVAL;
217                         }
218                 }
219         }
220         return 0;
221 }
222 
223 
224 /* Inode operations in similar order to how they appear in Linux file fs.h */
225 
226 static int
227 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
228                struct tcon_link *tlink, unsigned oflags, umode_t mode,
229                __u32 *oplock, struct cifs_fid *fid)
230 {
231         int rc = -ENOENT;
232         int create_options = CREATE_NOT_DIR;
233         int desired_access;
234         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
235         struct cifs_tcon *tcon = tlink_tcon(tlink);
236         char *full_path = NULL;
237         FILE_ALL_INFO *buf = NULL;
238         struct inode *newinode = NULL;
239         int disposition;
240         struct TCP_Server_Info *server = tcon->ses->server;
241         struct cifs_open_parms oparms;
242 
243         *oplock = 0;
244         if (tcon->ses->server->oplocks)
245                 *oplock = REQ_OPLOCK;
246 
247         full_path = build_path_from_dentry(direntry);
248         if (full_path == NULL) {
249                 rc = -ENOMEM;
250                 goto out;
251         }
252 
253         if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
254             (CIFS_UNIX_POSIX_PATH_OPS_CAP &
255                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
256                 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
257                                      oflags, oplock, &fid->netfid, xid);
258                 switch (rc) {
259                 case 0:
260                         if (newinode == NULL) {
261                                 /* query inode info */
262                                 goto cifs_create_get_file_info;
263                         }
264 
265                         if (S_ISDIR(newinode->i_mode)) {
266                                 CIFSSMBClose(xid, tcon, fid->netfid);
267                                 iput(newinode);
268                                 rc = -EISDIR;
269                                 goto out;
270                         }
271 
272                         if (!S_ISREG(newinode->i_mode)) {
273                                 /*
274                                  * The server may allow us to open things like
275                                  * FIFOs, but the client isn't set up to deal
276                                  * with that. If it's not a regular file, just
277                                  * close it and proceed as if it were a normal
278                                  * lookup.
279                                  */
280                                 CIFSSMBClose(xid, tcon, fid->netfid);
281                                 goto cifs_create_get_file_info;
282                         }
283                         /* success, no need to query */
284                         goto cifs_create_set_dentry;
285 
286                 case -ENOENT:
287                         goto cifs_create_get_file_info;
288 
289                 case -EIO:
290                 case -EINVAL:
291                         /*
292                          * EIO could indicate that (posix open) operation is not
293                          * supported, despite what server claimed in capability
294                          * negotiation.
295                          *
296                          * POSIX open in samba versions 3.3.1 and earlier could
297                          * incorrectly fail with invalid parameter.
298                          */
299                         tcon->broken_posix_open = true;
300                         break;
301 
302                 case -EREMOTE:
303                 case -EOPNOTSUPP:
304                         /*
305                          * EREMOTE indicates DFS junction, which is not handled
306                          * in posix open.  If either that or op not supported
307                          * returned, follow the normal lookup.
308                          */
309                         break;
310 
311                 default:
312                         goto out;
313                 }
314                 /*
315                  * fallthrough to retry, using older open call, this is case
316                  * where server does not support this SMB level, and falsely
317                  * claims capability (also get here for DFS case which should be
318                  * rare for path not covered on files)
319                  */
320         }
321 
322         desired_access = 0;
323         if (OPEN_FMODE(oflags) & FMODE_READ)
324                 desired_access |= GENERIC_READ; /* is this too little? */
325         if (OPEN_FMODE(oflags) & FMODE_WRITE)
326                 desired_access |= GENERIC_WRITE;
327 
328         disposition = FILE_OVERWRITE_IF;
329         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
330                 disposition = FILE_CREATE;
331         else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
332                 disposition = FILE_OVERWRITE_IF;
333         else if ((oflags & O_CREAT) == O_CREAT)
334                 disposition = FILE_OPEN_IF;
335         else
336                 cifs_dbg(FYI, "Create flag not set in create function\n");
337 
338         /*
339          * BB add processing to set equivalent of mode - e.g. via CreateX with
340          * ACLs
341          */
342 
343         if (!server->ops->open) {
344                 rc = -ENOSYS;
345                 goto out;
346         }
347 
348         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
349         if (buf == NULL) {
350                 rc = -ENOMEM;
351                 goto out;
352         }
353 
354         /*
355          * if we're not using unix extensions, see if we need to set
356          * ATTR_READONLY on the create call
357          */
358         if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
359                 create_options |= CREATE_OPTION_READONLY;
360 
361         if (backup_cred(cifs_sb))
362                 create_options |= CREATE_OPEN_BACKUP_INTENT;
363 
364         oparms.tcon = tcon;
365         oparms.cifs_sb = cifs_sb;
366         oparms.desired_access = desired_access;
367         oparms.create_options = create_options;
368         oparms.disposition = disposition;
369         oparms.path = full_path;
370         oparms.fid = fid;
371         oparms.reconnect = false;
372 
373         rc = server->ops->open(xid, &oparms, oplock, buf);
374         if (rc) {
375                 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
376                 goto out;
377         }
378 
379         /*
380          * If Open reported that we actually created a file then we now have to
381          * set the mode if possible.
382          */
383         if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
384                 struct cifs_unix_set_info_args args = {
385                                 .mode   = mode,
386                                 .ctime  = NO_CHANGE_64,
387                                 .atime  = NO_CHANGE_64,
388                                 .mtime  = NO_CHANGE_64,
389                                 .device = 0,
390                 };
391 
392                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
393                         args.uid = current_fsuid();
394                         if (inode->i_mode & S_ISGID)
395                                 args.gid = inode->i_gid;
396                         else
397                                 args.gid = current_fsgid();
398                 } else {
399                         args.uid = INVALID_UID; /* no change */
400                         args.gid = INVALID_GID; /* no change */
401                 }
402                 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
403                                        current->tgid);
404         } else {
405                 /*
406                  * BB implement mode setting via Windows security
407                  * descriptors e.g.
408                  */
409                 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
410 
411                 /* Could set r/o dos attribute if mode & 0222 == 0 */
412         }
413 
414 cifs_create_get_file_info:
415         /* server might mask mode so we have to query for it */
416         if (tcon->unix_ext)
417                 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
418                                               xid);
419         else {
420                 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
421                                          xid, fid);
422                 if (newinode) {
423                         if (server->ops->set_lease_key)
424                                 server->ops->set_lease_key(newinode, fid);
425                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
426                                 newinode->i_mode = mode;
427                         if ((*oplock & CIFS_CREATE_ACTION) &&
428                             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
429                                 newinode->i_uid = current_fsuid();
430                                 if (inode->i_mode & S_ISGID)
431                                         newinode->i_gid = inode->i_gid;
432                                 else
433                                         newinode->i_gid = current_fsgid();
434                         }
435                 }
436         }
437 
438 cifs_create_set_dentry:
439         if (rc != 0) {
440                 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
441                          rc);
442                 goto out_err;
443         }
444 
445         if (S_ISDIR(newinode->i_mode)) {
446                 rc = -EISDIR;
447                 goto out_err;
448         }
449 
450         d_drop(direntry);
451         d_add(direntry, newinode);
452 
453 out:
454         kfree(buf);
455         kfree(full_path);
456         return rc;
457 
458 out_err:
459         if (server->ops->close)
460                 server->ops->close(xid, tcon, fid);
461         if (newinode)
462                 iput(newinode);
463         goto out;
464 }
465 
466 int
467 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
468                  struct file *file, unsigned oflags, umode_t mode,
469                  int *opened)
470 {
471         int rc;
472         unsigned int xid;
473         struct tcon_link *tlink;
474         struct cifs_tcon *tcon;
475         struct TCP_Server_Info *server;
476         struct cifs_fid fid;
477         struct cifs_pending_open open;
478         __u32 oplock;
479         struct cifsFileInfo *file_info;
480 
481         /*
482          * Posix open is only called (at lookup time) for file create now. For
483          * opens (rather than creates), because we do not know if it is a file
484          * or directory yet, and current Samba no longer allows us to do posix
485          * open on dirs, we could end up wasting an open call on what turns out
486          * to be a dir. For file opens, we wait to call posix open till
487          * cifs_open.  It could be added to atomic_open in the future but the
488          * performance tradeoff of the extra network request when EISDIR or
489          * EACCES is returned would have to be weighed against the 50% reduction
490          * in network traffic in the other paths.
491          */
492         if (!(oflags & O_CREAT)) {
493                 struct dentry *res;
494 
495                 /*
496                  * Check for hashed negative dentry. We have already revalidated
497                  * the dentry and it is fine. No need to perform another lookup.
498                  */
499                 if (!d_in_lookup(direntry))
500                         return -ENOENT;
501 
502                 res = cifs_lookup(inode, direntry, 0);
503                 if (IS_ERR(res))
504                         return PTR_ERR(res);
505 
506                 return finish_no_open(file, res);
507         }
508 
509         xid = get_xid();
510 
511         cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
512                  inode, direntry, direntry);
513 
514         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
515         if (IS_ERR(tlink)) {
516                 rc = PTR_ERR(tlink);
517                 goto out_free_xid;
518         }
519 
520         tcon = tlink_tcon(tlink);
521 
522         rc = check_name(direntry, tcon);
523         if (rc)
524                 goto out;
525 
526         server = tcon->ses->server;
527 
528         if (server->ops->new_lease_key)
529                 server->ops->new_lease_key(&fid);
530 
531         cifs_add_pending_open(&fid, tlink, &open);
532 
533         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
534                             &oplock, &fid);
535 
536         if (rc) {
537                 cifs_del_pending_open(&open);
538                 goto out;
539         }
540 
541         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
542                 *opened |= FILE_CREATED;
543 
544         rc = finish_open(file, direntry, generic_file_open, opened);
545         if (rc) {
546                 if (server->ops->close)
547                         server->ops->close(xid, tcon, &fid);
548                 cifs_del_pending_open(&open);
549                 goto out;
550         }
551 
552         if (file->f_flags & O_DIRECT &&
553             CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
554                 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
555                         file->f_op = &cifs_file_direct_nobrl_ops;
556                 else
557                         file->f_op = &cifs_file_direct_ops;
558                 }
559 
560         file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
561         if (file_info == NULL) {
562                 if (server->ops->close)
563                         server->ops->close(xid, tcon, &fid);
564                 cifs_del_pending_open(&open);
565                 fput(file);
566                 rc = -ENOMEM;
567         }
568 
569 out:
570         cifs_put_tlink(tlink);
571 out_free_xid:
572         free_xid(xid);
573         return rc;
574 }
575 
576 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
577                 bool excl)
578 {
579         int rc;
580         unsigned int xid = get_xid();
581         /*
582          * BB below access is probably too much for mknod to request
583          *    but we have to do query and setpathinfo so requesting
584          *    less could fail (unless we want to request getatr and setatr
585          *    permissions (only).  At least for POSIX we do not have to
586          *    request so much.
587          */
588         unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
589         struct tcon_link *tlink;
590         struct cifs_tcon *tcon;
591         struct TCP_Server_Info *server;
592         struct cifs_fid fid;
593         __u32 oplock;
594 
595         cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
596                  inode, direntry, direntry);
597 
598         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
599         rc = PTR_ERR(tlink);
600         if (IS_ERR(tlink))
601                 goto out_free_xid;
602 
603         tcon = tlink_tcon(tlink);
604         server = tcon->ses->server;
605 
606         if (server->ops->new_lease_key)
607                 server->ops->new_lease_key(&fid);
608 
609         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
610                             &oplock, &fid);
611         if (!rc && server->ops->close)
612                 server->ops->close(xid, tcon, &fid);
613 
614         cifs_put_tlink(tlink);
615 out_free_xid:
616         free_xid(xid);
617         return rc;
618 }
619 
620 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
621                 dev_t device_number)
622 {
623         int rc = -EPERM;
624         unsigned int xid;
625         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
626         struct cifs_sb_info *cifs_sb;
627         struct tcon_link *tlink;
628         struct cifs_tcon *tcon;
629         struct cifs_io_parms io_parms;
630         char *full_path = NULL;
631         struct inode *newinode = NULL;
632         __u32 oplock = 0;
633         struct cifs_fid fid;
634         struct cifs_open_parms oparms;
635         FILE_ALL_INFO *buf = NULL;
636         unsigned int bytes_written;
637         struct win_dev *pdev;
638         struct kvec iov[2];
639 
640         if (!old_valid_dev(device_number))
641                 return -EINVAL;
642 
643         cifs_sb = CIFS_SB(inode->i_sb);
644         tlink = cifs_sb_tlink(cifs_sb);
645         if (IS_ERR(tlink))
646                 return PTR_ERR(tlink);
647 
648         tcon = tlink_tcon(tlink);
649 
650         xid = get_xid();
651 
652         full_path = build_path_from_dentry(direntry);
653         if (full_path == NULL) {
654                 rc = -ENOMEM;
655                 goto mknod_out;
656         }
657 
658         if (tcon->unix_ext) {
659                 struct cifs_unix_set_info_args args = {
660                         .mode   = mode & ~current_umask(),
661                         .ctime  = NO_CHANGE_64,
662                         .atime  = NO_CHANGE_64,
663                         .mtime  = NO_CHANGE_64,
664                         .device = device_number,
665                 };
666                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
667                         args.uid = current_fsuid();
668                         args.gid = current_fsgid();
669                 } else {
670                         args.uid = INVALID_UID; /* no change */
671                         args.gid = INVALID_GID; /* no change */
672                 }
673                 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
674                                             cifs_sb->local_nls,
675                                             cifs_remap(cifs_sb));
676                 if (rc)
677                         goto mknod_out;
678 
679                 rc = cifs_get_inode_info_unix(&newinode, full_path,
680                                                 inode->i_sb, xid);
681 
682                 if (rc == 0)
683                         d_instantiate(direntry, newinode);
684                 goto mknod_out;
685         }
686 
687         if (!S_ISCHR(mode) && !S_ISBLK(mode))
688                 goto mknod_out;
689 
690         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
691                 goto mknod_out;
692 
693 
694         cifs_dbg(FYI, "sfu compat create special file\n");
695 
696         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
697         if (buf == NULL) {
698                 rc = -ENOMEM;
699                 goto mknod_out;
700         }
701 
702         if (backup_cred(cifs_sb))
703                 create_options |= CREATE_OPEN_BACKUP_INTENT;
704 
705         oparms.tcon = tcon;
706         oparms.cifs_sb = cifs_sb;
707         oparms.desired_access = GENERIC_WRITE;
708         oparms.create_options = create_options;
709         oparms.disposition = FILE_CREATE;
710         oparms.path = full_path;
711         oparms.fid = &fid;
712         oparms.reconnect = false;
713 
714         if (tcon->ses->server->oplocks)
715                 oplock = REQ_OPLOCK;
716         else
717                 oplock = 0;
718         rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
719         if (rc)
720                 goto mknod_out;
721 
722         /*
723          * BB Do not bother to decode buf since no local inode yet to put
724          * timestamps in, but we can reuse it safely.
725          */
726 
727         pdev = (struct win_dev *)buf;
728         io_parms.pid = current->tgid;
729         io_parms.tcon = tcon;
730         io_parms.offset = 0;
731         io_parms.length = sizeof(struct win_dev);
732         iov[1].iov_base = buf;
733         iov[1].iov_len = sizeof(struct win_dev);
734         if (S_ISCHR(mode)) {
735                 memcpy(pdev->type, "IntxCHR", 8);
736                 pdev->major = cpu_to_le64(MAJOR(device_number));
737                 pdev->minor = cpu_to_le64(MINOR(device_number));
738                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
739                                                         &bytes_written, iov, 1);
740         } else if (S_ISBLK(mode)) {
741                 memcpy(pdev->type, "IntxBLK", 8);
742                 pdev->major = cpu_to_le64(MAJOR(device_number));
743                 pdev->minor = cpu_to_le64(MINOR(device_number));
744                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
745                                                         &bytes_written, iov, 1);
746         }
747         tcon->ses->server->ops->close(xid, tcon, &fid);
748         d_drop(direntry);
749 
750         /* FIXME: add code here to set EAs */
751 
752 mknod_out:
753         kfree(full_path);
754         kfree(buf);
755         free_xid(xid);
756         cifs_put_tlink(tlink);
757         return rc;
758 }
759 
760 struct dentry *
761 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
762             unsigned int flags)
763 {
764         unsigned int xid;
765         int rc = 0; /* to get around spurious gcc warning, set to zero here */
766         struct cifs_sb_info *cifs_sb;
767         struct tcon_link *tlink;
768         struct cifs_tcon *pTcon;
769         struct inode *newInode = NULL;
770         char *full_path = NULL;
771 
772         xid = get_xid();
773 
774         cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
775                  parent_dir_inode, direntry, direntry);
776 
777         /* check whether path exists */
778 
779         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
780         tlink = cifs_sb_tlink(cifs_sb);
781         if (IS_ERR(tlink)) {
782                 free_xid(xid);
783                 return (struct dentry *)tlink;
784         }
785         pTcon = tlink_tcon(tlink);
786 
787         rc = check_name(direntry, pTcon);
788         if (rc)
789                 goto lookup_out;
790 
791         /* can not grab the rename sem here since it would
792         deadlock in the cases (beginning of sys_rename itself)
793         in which we already have the sb rename sem */
794         full_path = build_path_from_dentry(direntry);
795         if (full_path == NULL) {
796                 rc = -ENOMEM;
797                 goto lookup_out;
798         }
799 
800         if (d_really_is_positive(direntry)) {
801                 cifs_dbg(FYI, "non-NULL inode in lookup\n");
802         } else {
803                 cifs_dbg(FYI, "NULL inode in lookup\n");
804         }
805         cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
806                  full_path, d_inode(direntry));
807 
808         if (pTcon->unix_ext) {
809                 rc = cifs_get_inode_info_unix(&newInode, full_path,
810                                               parent_dir_inode->i_sb, xid);
811         } else {
812                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
813                                 parent_dir_inode->i_sb, xid, NULL);
814         }
815 
816         if ((rc == 0) && (newInode != NULL)) {
817                 d_add(direntry, newInode);
818                 /* since paths are not looked up by component - the parent
819                    directories are presumed to be good here */
820                 renew_parental_timestamps(direntry);
821 
822         } else if (rc == -ENOENT) {
823                 rc = 0;
824                 cifs_set_time(direntry, jiffies);
825                 d_add(direntry, NULL);
826         /*      if it was once a directory (but how can we tell?) we could do
827                 shrink_dcache_parent(direntry); */
828         } else if (rc != -EACCES) {
829                 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
830                 /* We special case check for Access Denied - since that
831                 is a common return code */
832         }
833 
834 lookup_out:
835         kfree(full_path);
836         cifs_put_tlink(tlink);
837         free_xid(xid);
838         return ERR_PTR(rc);
839 }
840 
841 static int
842 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
843 {
844         if (flags & LOOKUP_RCU)
845                 return -ECHILD;
846 
847         if (d_really_is_positive(direntry)) {
848                 if (cifs_revalidate_dentry(direntry))
849                         return 0;
850                 else {
851                         /*
852                          * If the inode wasn't known to be a dfs entry when
853                          * the dentry was instantiated, such as when created
854                          * via ->readdir(), it needs to be set now since the
855                          * attributes will have been updated by
856                          * cifs_revalidate_dentry().
857                          */
858                         if (IS_AUTOMOUNT(d_inode(direntry)) &&
859                            !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
860                                 spin_lock(&direntry->d_lock);
861                                 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
862                                 spin_unlock(&direntry->d_lock);
863                         }
864 
865                         return 1;
866                 }
867         }
868 
869         /*
870          * This may be nfsd (or something), anyway, we can't see the
871          * intent of this. So, since this can be for creation, drop it.
872          */
873         if (!flags)
874                 return 0;
875 
876         /*
877          * Drop the negative dentry, in order to make sure to use the
878          * case sensitive name which is specified by user if this is
879          * for creation.
880          */
881         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
882                 return 0;
883 
884         if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
885                 return 0;
886 
887         return 1;
888 }
889 
890 /* static int cifs_d_delete(struct dentry *direntry)
891 {
892         int rc = 0;
893 
894         cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
895 
896         return rc;
897 }     */
898 
899 const struct dentry_operations cifs_dentry_ops = {
900         .d_revalidate = cifs_d_revalidate,
901         .d_automount = cifs_dfs_d_automount,
902 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
903 };
904 
905 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
906 {
907         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
908         unsigned long hash;
909         wchar_t c;
910         int i, charlen;
911 
912         hash = init_name_hash(dentry);
913         for (i = 0; i < q->len; i += charlen) {
914                 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
915                 /* error out if we can't convert the character */
916                 if (unlikely(charlen < 0))
917                         return charlen;
918                 hash = partial_name_hash(cifs_toupper(c), hash);
919         }
920         q->hash = end_name_hash(hash);
921 
922         return 0;
923 }
924 
925 static int cifs_ci_compare(const struct dentry *dentry,
926                 unsigned int len, const char *str, const struct qstr *name)
927 {
928         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
929         wchar_t c1, c2;
930         int i, l1, l2;
931 
932         /*
933          * We make the assumption here that uppercase characters in the local
934          * codepage are always the same length as their lowercase counterparts.
935          *
936          * If that's ever not the case, then this will fail to match it.
937          */
938         if (name->len != len)
939                 return 1;
940 
941         for (i = 0; i < len; i += l1) {
942                 /* Convert characters in both strings to UTF-16. */
943                 l1 = codepage->char2uni(&str[i], len - i, &c1);
944                 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
945 
946                 /*
947                  * If we can't convert either character, just declare it to
948                  * be 1 byte long and compare the original byte.
949                  */
950                 if (unlikely(l1 < 0 && l2 < 0)) {
951                         if (str[i] != name->name[i])
952                                 return 1;
953                         l1 = 1;
954                         continue;
955                 }
956 
957                 /*
958                  * Here, we again ass|u|me that upper/lowercase versions of
959                  * a character are the same length in the local NLS.
960                  */
961                 if (l1 != l2)
962                         return 1;
963 
964                 /* Now compare uppercase versions of these characters */
965                 if (cifs_toupper(c1) != cifs_toupper(c2))
966                         return 1;
967         }
968 
969         return 0;
970 }
971 
972 const struct dentry_operations cifs_ci_dentry_ops = {
973         .d_revalidate = cifs_d_revalidate,
974         .d_hash = cifs_ci_hash,
975         .d_compare = cifs_ci_compare,
976         .d_automount = cifs_dfs_d_automount,
977 };
978 

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