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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] = dirsep;
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         oparms.mode = mode;
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 {
470         int rc;
471         unsigned int xid;
472         struct tcon_link *tlink;
473         struct cifs_tcon *tcon;
474         struct TCP_Server_Info *server;
475         struct cifs_fid fid;
476         struct cifs_pending_open open;
477         __u32 oplock;
478         struct cifsFileInfo *file_info;
479 
480         /*
481          * Posix open is only called (at lookup time) for file create now. For
482          * opens (rather than creates), because we do not know if it is a file
483          * or directory yet, and current Samba no longer allows us to do posix
484          * open on dirs, we could end up wasting an open call on what turns out
485          * to be a dir. For file opens, we wait to call posix open till
486          * cifs_open.  It could be added to atomic_open in the future but the
487          * performance tradeoff of the extra network request when EISDIR or
488          * EACCES is returned would have to be weighed against the 50% reduction
489          * in network traffic in the other paths.
490          */
491         if (!(oflags & O_CREAT)) {
492                 struct dentry *res;
493 
494                 /*
495                  * Check for hashed negative dentry. We have already revalidated
496                  * the dentry and it is fine. No need to perform another lookup.
497                  */
498                 if (!d_in_lookup(direntry))
499                         return -ENOENT;
500 
501                 res = cifs_lookup(inode, direntry, 0);
502                 if (IS_ERR(res))
503                         return PTR_ERR(res);
504 
505                 return finish_no_open(file, res);
506         }
507 
508         xid = get_xid();
509 
510         cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
511                  inode, direntry, direntry);
512 
513         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
514         if (IS_ERR(tlink)) {
515                 rc = PTR_ERR(tlink);
516                 goto out_free_xid;
517         }
518 
519         tcon = tlink_tcon(tlink);
520 
521         rc = check_name(direntry, tcon);
522         if (rc)
523                 goto out;
524 
525         server = tcon->ses->server;
526 
527         if (server->ops->new_lease_key)
528                 server->ops->new_lease_key(&fid);
529 
530         cifs_add_pending_open(&fid, tlink, &open);
531 
532         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
533                             &oplock, &fid);
534 
535         if (rc) {
536                 cifs_del_pending_open(&open);
537                 goto out;
538         }
539 
540         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
541                 file->f_mode |= FMODE_CREATED;
542 
543         rc = finish_open(file, direntry, generic_file_open);
544         if (rc) {
545                 if (server->ops->close)
546                         server->ops->close(xid, tcon, &fid);
547                 cifs_del_pending_open(&open);
548                 goto out;
549         }
550 
551         if (file->f_flags & O_DIRECT &&
552             CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
553                 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
554                         file->f_op = &cifs_file_direct_nobrl_ops;
555                 else
556                         file->f_op = &cifs_file_direct_ops;
557                 }
558 
559         file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
560         if (file_info == NULL) {
561                 if (server->ops->close)
562                         server->ops->close(xid, tcon, &fid);
563                 cifs_del_pending_open(&open);
564                 fput(file);
565                 rc = -ENOMEM;
566         }
567 
568 out:
569         cifs_put_tlink(tlink);
570 out_free_xid:
571         free_xid(xid);
572         return rc;
573 }
574 
575 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
576                 bool excl)
577 {
578         int rc;
579         unsigned int xid = get_xid();
580         /*
581          * BB below access is probably too much for mknod to request
582          *    but we have to do query and setpathinfo so requesting
583          *    less could fail (unless we want to request getatr and setatr
584          *    permissions (only).  At least for POSIX we do not have to
585          *    request so much.
586          */
587         unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
588         struct tcon_link *tlink;
589         struct cifs_tcon *tcon;
590         struct TCP_Server_Info *server;
591         struct cifs_fid fid;
592         __u32 oplock;
593 
594         cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
595                  inode, direntry, direntry);
596 
597         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
598         rc = PTR_ERR(tlink);
599         if (IS_ERR(tlink))
600                 goto out_free_xid;
601 
602         tcon = tlink_tcon(tlink);
603         server = tcon->ses->server;
604 
605         if (server->ops->new_lease_key)
606                 server->ops->new_lease_key(&fid);
607 
608         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
609                             &oplock, &fid);
610         if (!rc && server->ops->close)
611                 server->ops->close(xid, tcon, &fid);
612 
613         cifs_put_tlink(tlink);
614 out_free_xid:
615         free_xid(xid);
616         return rc;
617 }
618 
619 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
620                 dev_t device_number)
621 {
622         int rc = -EPERM;
623         unsigned int xid;
624         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
625         struct cifs_sb_info *cifs_sb;
626         struct tcon_link *tlink;
627         struct cifs_tcon *tcon;
628         struct cifs_io_parms io_parms;
629         char *full_path = NULL;
630         struct inode *newinode = NULL;
631         __u32 oplock = 0;
632         struct cifs_fid fid;
633         struct cifs_open_parms oparms;
634         FILE_ALL_INFO *buf = NULL;
635         unsigned int bytes_written;
636         struct win_dev *pdev;
637         struct kvec iov[2];
638 
639         if (!old_valid_dev(device_number))
640                 return -EINVAL;
641 
642         cifs_sb = CIFS_SB(inode->i_sb);
643         tlink = cifs_sb_tlink(cifs_sb);
644         if (IS_ERR(tlink))
645                 return PTR_ERR(tlink);
646 
647         tcon = tlink_tcon(tlink);
648 
649         xid = get_xid();
650 
651         full_path = build_path_from_dentry(direntry);
652         if (full_path == NULL) {
653                 rc = -ENOMEM;
654                 goto mknod_out;
655         }
656 
657         if (tcon->unix_ext) {
658                 struct cifs_unix_set_info_args args = {
659                         .mode   = mode & ~current_umask(),
660                         .ctime  = NO_CHANGE_64,
661                         .atime  = NO_CHANGE_64,
662                         .mtime  = NO_CHANGE_64,
663                         .device = device_number,
664                 };
665                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
666                         args.uid = current_fsuid();
667                         args.gid = current_fsgid();
668                 } else {
669                         args.uid = INVALID_UID; /* no change */
670                         args.gid = INVALID_GID; /* no change */
671                 }
672                 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
673                                             cifs_sb->local_nls,
674                                             cifs_remap(cifs_sb));
675                 if (rc)
676                         goto mknod_out;
677 
678                 rc = cifs_get_inode_info_unix(&newinode, full_path,
679                                                 inode->i_sb, xid);
680 
681                 if (rc == 0)
682                         d_instantiate(direntry, newinode);
683                 goto mknod_out;
684         }
685 
686         if (!S_ISCHR(mode) && !S_ISBLK(mode))
687                 goto mknod_out;
688 
689         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
690                 goto mknod_out;
691 
692 
693         cifs_dbg(FYI, "sfu compat create special file\n");
694 
695         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
696         if (buf == NULL) {
697                 rc = -ENOMEM;
698                 goto mknod_out;
699         }
700 
701         if (backup_cred(cifs_sb))
702                 create_options |= CREATE_OPEN_BACKUP_INTENT;
703 
704         oparms.tcon = tcon;
705         oparms.cifs_sb = cifs_sb;
706         oparms.desired_access = GENERIC_WRITE;
707         oparms.create_options = create_options;
708         oparms.disposition = FILE_CREATE;
709         oparms.path = full_path;
710         oparms.fid = &fid;
711         oparms.reconnect = false;
712 
713         if (tcon->ses->server->oplocks)
714                 oplock = REQ_OPLOCK;
715         else
716                 oplock = 0;
717         rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
718         if (rc)
719                 goto mknod_out;
720 
721         /*
722          * BB Do not bother to decode buf since no local inode yet to put
723          * timestamps in, but we can reuse it safely.
724          */
725 
726         pdev = (struct win_dev *)buf;
727         io_parms.pid = current->tgid;
728         io_parms.tcon = tcon;
729         io_parms.offset = 0;
730         io_parms.length = sizeof(struct win_dev);
731         iov[1].iov_base = buf;
732         iov[1].iov_len = sizeof(struct win_dev);
733         if (S_ISCHR(mode)) {
734                 memcpy(pdev->type, "IntxCHR", 8);
735                 pdev->major = cpu_to_le64(MAJOR(device_number));
736                 pdev->minor = cpu_to_le64(MINOR(device_number));
737                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
738                                                         &bytes_written, iov, 1);
739         } else if (S_ISBLK(mode)) {
740                 memcpy(pdev->type, "IntxBLK", 8);
741                 pdev->major = cpu_to_le64(MAJOR(device_number));
742                 pdev->minor = cpu_to_le64(MINOR(device_number));
743                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
744                                                         &bytes_written, iov, 1);
745         }
746         tcon->ses->server->ops->close(xid, tcon, &fid);
747         d_drop(direntry);
748 
749         /* FIXME: add code here to set EAs */
750 
751 mknod_out:
752         kfree(full_path);
753         kfree(buf);
754         free_xid(xid);
755         cifs_put_tlink(tlink);
756         return rc;
757 }
758 
759 struct dentry *
760 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
761             unsigned int flags)
762 {
763         unsigned int xid;
764         int rc = 0; /* to get around spurious gcc warning, set to zero here */
765         struct cifs_sb_info *cifs_sb;
766         struct tcon_link *tlink;
767         struct cifs_tcon *pTcon;
768         struct inode *newInode = NULL;
769         char *full_path = NULL;
770 
771         xid = get_xid();
772 
773         cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
774                  parent_dir_inode, direntry, direntry);
775 
776         /* check whether path exists */
777 
778         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
779         tlink = cifs_sb_tlink(cifs_sb);
780         if (IS_ERR(tlink)) {
781                 free_xid(xid);
782                 return ERR_CAST(tlink);
783         }
784         pTcon = tlink_tcon(tlink);
785 
786         rc = check_name(direntry, pTcon);
787         if (unlikely(rc)) {
788                 cifs_put_tlink(tlink);
789                 free_xid(xid);
790                 return ERR_PTR(rc);
791         }
792 
793         /* can not grab the rename sem here since it would
794         deadlock in the cases (beginning of sys_rename itself)
795         in which we already have the sb rename sem */
796         full_path = build_path_from_dentry(direntry);
797         if (full_path == NULL) {
798                 cifs_put_tlink(tlink);
799                 free_xid(xid);
800                 return ERR_PTR(-ENOMEM);
801         }
802 
803         if (d_really_is_positive(direntry)) {
804                 cifs_dbg(FYI, "non-NULL inode in lookup\n");
805         } else {
806                 cifs_dbg(FYI, "NULL inode in lookup\n");
807         }
808         cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
809                  full_path, d_inode(direntry));
810 
811         if (pTcon->unix_ext) {
812                 rc = cifs_get_inode_info_unix(&newInode, full_path,
813                                               parent_dir_inode->i_sb, xid);
814         } else {
815                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
816                                 parent_dir_inode->i_sb, xid, NULL);
817         }
818 
819         if (rc == 0) {
820                 /* since paths are not looked up by component - the parent
821                    directories are presumed to be good here */
822                 renew_parental_timestamps(direntry);
823         } else if (rc == -ENOENT) {
824                 cifs_set_time(direntry, jiffies);
825                 newInode = NULL;
826         } else {
827                 if (rc != -EACCES) {
828                         cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
829                         /* We special case check for Access Denied - since that
830                         is a common return code */
831                 }
832                 newInode = ERR_PTR(rc);
833         }
834         kfree(full_path);
835         cifs_put_tlink(tlink);
836         free_xid(xid);
837         return d_splice_alias(newInode, direntry);
838 }
839 
840 static int
841 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
842 {
843         if (flags & LOOKUP_RCU)
844                 return -ECHILD;
845 
846         if (d_really_is_positive(direntry)) {
847                 if (cifs_revalidate_dentry(direntry))
848                         return 0;
849                 else {
850                         /*
851                          * If the inode wasn't known to be a dfs entry when
852                          * the dentry was instantiated, such as when created
853                          * via ->readdir(), it needs to be set now since the
854                          * attributes will have been updated by
855                          * cifs_revalidate_dentry().
856                          */
857                         if (IS_AUTOMOUNT(d_inode(direntry)) &&
858                            !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
859                                 spin_lock(&direntry->d_lock);
860                                 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
861                                 spin_unlock(&direntry->d_lock);
862                         }
863 
864                         return 1;
865                 }
866         }
867 
868         /*
869          * This may be nfsd (or something), anyway, we can't see the
870          * intent of this. So, since this can be for creation, drop it.
871          */
872         if (!flags)
873                 return 0;
874 
875         /*
876          * Drop the negative dentry, in order to make sure to use the
877          * case sensitive name which is specified by user if this is
878          * for creation.
879          */
880         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
881                 return 0;
882 
883         if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
884                 return 0;
885 
886         return 1;
887 }
888 
889 /* static int cifs_d_delete(struct dentry *direntry)
890 {
891         int rc = 0;
892 
893         cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
894 
895         return rc;
896 }     */
897 
898 const struct dentry_operations cifs_dentry_ops = {
899         .d_revalidate = cifs_d_revalidate,
900         .d_automount = cifs_dfs_d_automount,
901 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
902 };
903 
904 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
905 {
906         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
907         unsigned long hash;
908         wchar_t c;
909         int i, charlen;
910 
911         hash = init_name_hash(dentry);
912         for (i = 0; i < q->len; i += charlen) {
913                 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
914                 /* error out if we can't convert the character */
915                 if (unlikely(charlen < 0))
916                         return charlen;
917                 hash = partial_name_hash(cifs_toupper(c), hash);
918         }
919         q->hash = end_name_hash(hash);
920 
921         return 0;
922 }
923 
924 static int cifs_ci_compare(const struct dentry *dentry,
925                 unsigned int len, const char *str, const struct qstr *name)
926 {
927         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
928         wchar_t c1, c2;
929         int i, l1, l2;
930 
931         /*
932          * We make the assumption here that uppercase characters in the local
933          * codepage are always the same length as their lowercase counterparts.
934          *
935          * If that's ever not the case, then this will fail to match it.
936          */
937         if (name->len != len)
938                 return 1;
939 
940         for (i = 0; i < len; i += l1) {
941                 /* Convert characters in both strings to UTF-16. */
942                 l1 = codepage->char2uni(&str[i], len - i, &c1);
943                 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
944 
945                 /*
946                  * If we can't convert either character, just declare it to
947                  * be 1 byte long and compare the original byte.
948                  */
949                 if (unlikely(l1 < 0 && l2 < 0)) {
950                         if (str[i] != name->name[i])
951                                 return 1;
952                         l1 = 1;
953                         continue;
954                 }
955 
956                 /*
957                  * Here, we again ass|u|me that upper/lowercase versions of
958                  * a character are the same length in the local NLS.
959                  */
960                 if (l1 != l2)
961                         return 1;
962 
963                 /* Now compare uppercase versions of these characters */
964                 if (cifs_toupper(c1) != cifs_toupper(c2))
965                         return 1;
966         }
967 
968         return 0;
969 }
970 
971 const struct dentry_operations cifs_ci_dentry_ops = {
972         .d_revalidate = cifs_d_revalidate,
973         .d_hash = cifs_ci_hash,
974         .d_compare = cifs_ci_compare,
975         .d_automount = cifs_dfs_d_automount,
976 };
977 

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