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

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