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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                 memcpy(full_path, tcon->treeName, dfsplen);
 73         full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
 74         memcpy(full_path + dfsplen + 1, vol->prepath, pplen);
 75         convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
 76         return full_path;
 77 }
 78 
 79 /* Note: caller must free return buffer */
 80 char *
 81 build_path_from_dentry(struct dentry *direntry)
 82 {
 83         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
 84         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 85         bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
 86 
 87         return build_path_from_dentry_optional_prefix(direntry,
 88                                                       prefix);
 89 }
 90 
 91 char *
 92 build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix)
 93 {
 94         struct dentry *temp;
 95         int namelen;
 96         int dfsplen;
 97         int pplen = 0;
 98         char *full_path;
 99         char dirsep;
100         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
101         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
102         unsigned seq;
103 
104         dirsep = CIFS_DIR_SEP(cifs_sb);
105         if (prefix)
106                 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
107         else
108                 dfsplen = 0;
109 
110         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
111                 pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
112 
113 cifs_bp_rename_retry:
114         namelen = dfsplen + pplen;
115         seq = read_seqbegin(&rename_lock);
116         rcu_read_lock();
117         for (temp = direntry; !IS_ROOT(temp);) {
118                 namelen += (1 + temp->d_name.len);
119                 temp = temp->d_parent;
120                 if (temp == NULL) {
121                         cifs_dbg(VFS, "corrupt dentry\n");
122                         rcu_read_unlock();
123                         return NULL;
124                 }
125         }
126         rcu_read_unlock();
127 
128         full_path = kmalloc(namelen+1, GFP_KERNEL);
129         if (full_path == NULL)
130                 return full_path;
131         full_path[namelen] = 0; /* trailing null */
132         rcu_read_lock();
133         for (temp = direntry; !IS_ROOT(temp);) {
134                 spin_lock(&temp->d_lock);
135                 namelen -= 1 + temp->d_name.len;
136                 if (namelen < 0) {
137                         spin_unlock(&temp->d_lock);
138                         break;
139                 } else {
140                         full_path[namelen] = dirsep;
141                         strncpy(full_path + namelen + 1, temp->d_name.name,
142                                 temp->d_name.len);
143                         cifs_dbg(FYI, "name: %s\n", full_path + namelen);
144                 }
145                 spin_unlock(&temp->d_lock);
146                 temp = temp->d_parent;
147                 if (temp == NULL) {
148                         cifs_dbg(VFS, "corrupt dentry\n");
149                         rcu_read_unlock();
150                         kfree(full_path);
151                         return NULL;
152                 }
153         }
154         rcu_read_unlock();
155         if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) {
156                 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
157                          namelen, dfsplen);
158                 /* presumably this is only possible if racing with a rename
159                 of one of the parent directories  (we can not lock the dentries
160                 above us to prevent this, but retrying should be harmless) */
161                 kfree(full_path);
162                 goto cifs_bp_rename_retry;
163         }
164         /* DIR_SEP already set for byte  0 / vs \ but not for
165            subsequent slashes in prepath which currently must
166            be entered the right way - not sure if there is an alternative
167            since the '\' is a valid posix character so we can not switch
168            those safely to '/' if any are found in the middle of the prepath */
169         /* BB test paths to Windows with '/' in the midst of prepath */
170 
171         if (pplen) {
172                 int i;
173 
174                 cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
175                 memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1);
176                 full_path[dfsplen] = dirsep;
177                 for (i = 0; i < pplen-1; i++)
178                         if (full_path[dfsplen+1+i] == '/')
179                                 full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb);
180         }
181 
182         if (dfsplen) {
183                 strncpy(full_path, tcon->treeName, dfsplen);
184                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
185                         int i;
186                         for (i = 0; i < dfsplen; i++) {
187                                 if (full_path[i] == '\\')
188                                         full_path[i] = '/';
189                         }
190                 }
191         }
192         return full_path;
193 }
194 
195 /*
196  * Don't allow path components longer than the server max.
197  * Don't allow the separator character in a path component.
198  * The VFS will not allow "/", but "\" is allowed by posix.
199  */
200 static int
201 check_name(struct dentry *direntry, struct cifs_tcon *tcon)
202 {
203         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
204         int i;
205 
206         if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
207                      direntry->d_name.len >
208                      le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
209                 return -ENAMETOOLONG;
210 
211         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
212                 for (i = 0; i < direntry->d_name.len; i++) {
213                         if (direntry->d_name.name[i] == '\\') {
214                                 cifs_dbg(FYI, "Invalid file name\n");
215                                 return -EINVAL;
216                         }
217                 }
218         }
219         return 0;
220 }
221 
222 
223 /* Inode operations in similar order to how they appear in Linux file fs.h */
224 
225 static int
226 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
227                struct tcon_link *tlink, unsigned oflags, umode_t mode,
228                __u32 *oplock, struct cifs_fid *fid)
229 {
230         int rc = -ENOENT;
231         int create_options = CREATE_NOT_DIR;
232         int desired_access;
233         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
234         struct cifs_tcon *tcon = tlink_tcon(tlink);
235         char *full_path = NULL;
236         FILE_ALL_INFO *buf = NULL;
237         struct inode *newinode = NULL;
238         int disposition;
239         struct TCP_Server_Info *server = tcon->ses->server;
240         struct cifs_open_parms oparms;
241 
242         *oplock = 0;
243         if (tcon->ses->server->oplocks)
244                 *oplock = REQ_OPLOCK;
245 
246         full_path = build_path_from_dentry(direntry);
247         if (full_path == NULL) {
248                 rc = -ENOMEM;
249                 goto out;
250         }
251 
252         if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
253             (CIFS_UNIX_POSIX_PATH_OPS_CAP &
254                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
255                 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
256                                      oflags, oplock, &fid->netfid, xid);
257                 switch (rc) {
258                 case 0:
259                         if (newinode == NULL) {
260                                 /* query inode info */
261                                 goto cifs_create_get_file_info;
262                         }
263 
264                         if (S_ISDIR(newinode->i_mode)) {
265                                 CIFSSMBClose(xid, tcon, fid->netfid);
266                                 iput(newinode);
267                                 rc = -EISDIR;
268                                 goto out;
269                         }
270 
271                         if (!S_ISREG(newinode->i_mode)) {
272                                 /*
273                                  * The server may allow us to open things like
274                                  * FIFOs, but the client isn't set up to deal
275                                  * with that. If it's not a regular file, just
276                                  * close it and proceed as if it were a normal
277                                  * lookup.
278                                  */
279                                 CIFSSMBClose(xid, tcon, fid->netfid);
280                                 goto cifs_create_get_file_info;
281                         }
282                         /* success, no need to query */
283                         goto cifs_create_set_dentry;
284 
285                 case -ENOENT:
286                         goto cifs_create_get_file_info;
287 
288                 case -EIO:
289                 case -EINVAL:
290                         /*
291                          * EIO could indicate that (posix open) operation is not
292                          * supported, despite what server claimed in capability
293                          * negotiation.
294                          *
295                          * POSIX open in samba versions 3.3.1 and earlier could
296                          * incorrectly fail with invalid parameter.
297                          */
298                         tcon->broken_posix_open = true;
299                         break;
300 
301                 case -EREMOTE:
302                 case -EOPNOTSUPP:
303                         /*
304                          * EREMOTE indicates DFS junction, which is not handled
305                          * in posix open.  If either that or op not supported
306                          * returned, follow the normal lookup.
307                          */
308                         break;
309 
310                 default:
311                         goto out;
312                 }
313                 /*
314                  * fallthrough to retry, using older open call, this is case
315                  * where server does not support this SMB level, and falsely
316                  * claims capability (also get here for DFS case which should be
317                  * rare for path not covered on files)
318                  */
319         }
320 
321         desired_access = 0;
322         if (OPEN_FMODE(oflags) & FMODE_READ)
323                 desired_access |= GENERIC_READ; /* is this too little? */
324         if (OPEN_FMODE(oflags) & FMODE_WRITE)
325                 desired_access |= GENERIC_WRITE;
326 
327         disposition = FILE_OVERWRITE_IF;
328         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
329                 disposition = FILE_CREATE;
330         else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
331                 disposition = FILE_OVERWRITE_IF;
332         else if ((oflags & O_CREAT) == O_CREAT)
333                 disposition = FILE_OPEN_IF;
334         else
335                 cifs_dbg(FYI, "Create flag not set in create function\n");
336 
337         /*
338          * BB add processing to set equivalent of mode - e.g. via CreateX with
339          * ACLs
340          */
341 
342         if (!server->ops->open) {
343                 rc = -ENOSYS;
344                 goto out;
345         }
346 
347         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
348         if (buf == NULL) {
349                 rc = -ENOMEM;
350                 goto out;
351         }
352 
353         /*
354          * if we're not using unix extensions, see if we need to set
355          * ATTR_READONLY on the create call
356          */
357         if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
358                 create_options |= CREATE_OPTION_READONLY;
359 
360         if (backup_cred(cifs_sb))
361                 create_options |= CREATE_OPEN_BACKUP_INTENT;
362 
363         oparms.tcon = tcon;
364         oparms.cifs_sb = cifs_sb;
365         oparms.desired_access = desired_access;
366         oparms.create_options = create_options;
367         oparms.disposition = disposition;
368         oparms.path = full_path;
369         oparms.fid = fid;
370         oparms.reconnect = false;
371         oparms.mode = mode;
372         rc = server->ops->open(xid, &oparms, oplock, buf);
373         if (rc) {
374                 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
375                 goto out;
376         }
377 
378         /*
379          * If Open reported that we actually created a file then we now have to
380          * set the mode if possible.
381          */
382         if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
383                 struct cifs_unix_set_info_args args = {
384                                 .mode   = mode,
385                                 .ctime  = NO_CHANGE_64,
386                                 .atime  = NO_CHANGE_64,
387                                 .mtime  = NO_CHANGE_64,
388                                 .device = 0,
389                 };
390 
391                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
392                         args.uid = current_fsuid();
393                         if (inode->i_mode & S_ISGID)
394                                 args.gid = inode->i_gid;
395                         else
396                                 args.gid = current_fsgid();
397                 } else {
398                         args.uid = INVALID_UID; /* no change */
399                         args.gid = INVALID_GID; /* no change */
400                 }
401                 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
402                                        current->tgid);
403         } else {
404                 /*
405                  * BB implement mode setting via Windows security
406                  * descriptors e.g.
407                  */
408                 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
409 
410                 /* Could set r/o dos attribute if mode & 0222 == 0 */
411         }
412 
413 cifs_create_get_file_info:
414         /* server might mask mode so we have to query for it */
415         if (tcon->unix_ext)
416                 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
417                                               xid);
418         else {
419                 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
420                                          xid, fid);
421                 if (newinode) {
422                         if (server->ops->set_lease_key)
423                                 server->ops->set_lease_key(newinode, fid);
424                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
425                                 newinode->i_mode = mode;
426                         if ((*oplock & CIFS_CREATE_ACTION) &&
427                             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
428                                 newinode->i_uid = current_fsuid();
429                                 if (inode->i_mode & S_ISGID)
430                                         newinode->i_gid = inode->i_gid;
431                                 else
432                                         newinode->i_gid = current_fsgid();
433                         }
434                 }
435         }
436 
437 cifs_create_set_dentry:
438         if (rc != 0) {
439                 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
440                          rc);
441                 goto out_err;
442         }
443 
444         if (S_ISDIR(newinode->i_mode)) {
445                 rc = -EISDIR;
446                 goto out_err;
447         }
448 
449         d_drop(direntry);
450         d_add(direntry, newinode);
451 
452 out:
453         kfree(buf);
454         kfree(full_path);
455         return rc;
456 
457 out_err:
458         if (server->ops->close)
459                 server->ops->close(xid, tcon, fid);
460         if (newinode)
461                 iput(newinode);
462         goto out;
463 }
464 
465 int
466 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
467                  struct file *file, unsigned oflags, umode_t mode)
468 {
469         int rc;
470         unsigned int xid;
471         struct tcon_link *tlink;
472         struct cifs_tcon *tcon;
473         struct TCP_Server_Info *server;
474         struct cifs_fid fid;
475         struct cifs_pending_open open;
476         __u32 oplock;
477         struct cifsFileInfo *file_info;
478 
479         /*
480          * Posix open is only called (at lookup time) for file create now. For
481          * opens (rather than creates), because we do not know if it is a file
482          * or directory yet, and current Samba no longer allows us to do posix
483          * open on dirs, we could end up wasting an open call on what turns out
484          * to be a dir. For file opens, we wait to call posix open till
485          * cifs_open.  It could be added to atomic_open in the future but the
486          * performance tradeoff of the extra network request when EISDIR or
487          * EACCES is returned would have to be weighed against the 50% reduction
488          * in network traffic in the other paths.
489          */
490         if (!(oflags & O_CREAT)) {
491                 struct dentry *res;
492 
493                 /*
494                  * Check for hashed negative dentry. We have already revalidated
495                  * the dentry and it is fine. No need to perform another lookup.
496                  */
497                 if (!d_in_lookup(direntry))
498                         return -ENOENT;
499 
500                 res = cifs_lookup(inode, direntry, 0);
501                 if (IS_ERR(res))
502                         return PTR_ERR(res);
503 
504                 return finish_no_open(file, res);
505         }
506 
507         xid = get_xid();
508 
509         cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
510                  inode, direntry, direntry);
511 
512         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
513         if (IS_ERR(tlink)) {
514                 rc = PTR_ERR(tlink);
515                 goto out_free_xid;
516         }
517 
518         tcon = tlink_tcon(tlink);
519 
520         rc = check_name(direntry, tcon);
521         if (rc)
522                 goto out;
523 
524         server = tcon->ses->server;
525 
526         if (server->ops->new_lease_key)
527                 server->ops->new_lease_key(&fid);
528 
529         cifs_add_pending_open(&fid, tlink, &open);
530 
531         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
532                             &oplock, &fid);
533 
534         if (rc) {
535                 cifs_del_pending_open(&open);
536                 goto out;
537         }
538 
539         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
540                 file->f_mode |= FMODE_CREATED;
541 
542         rc = finish_open(file, direntry, generic_file_open);
543         if (rc) {
544                 if (server->ops->close)
545                         server->ops->close(xid, tcon, &fid);
546                 cifs_del_pending_open(&open);
547                 goto out;
548         }
549 
550         if (file->f_flags & O_DIRECT &&
551             CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
552                 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
553                         file->f_op = &cifs_file_direct_nobrl_ops;
554                 else
555                         file->f_op = &cifs_file_direct_ops;
556                 }
557 
558         file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
559         if (file_info == NULL) {
560                 if (server->ops->close)
561                         server->ops->close(xid, tcon, &fid);
562                 cifs_del_pending_open(&open);
563                 fput(file);
564                 rc = -ENOMEM;
565         }
566 
567 out:
568         cifs_put_tlink(tlink);
569 out_free_xid:
570         free_xid(xid);
571         return rc;
572 }
573 
574 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
575                 bool excl)
576 {
577         int rc;
578         unsigned int xid = get_xid();
579         /*
580          * BB below access is probably too much for mknod to request
581          *    but we have to do query and setpathinfo so requesting
582          *    less could fail (unless we want to request getatr and setatr
583          *    permissions (only).  At least for POSIX we do not have to
584          *    request so much.
585          */
586         unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
587         struct tcon_link *tlink;
588         struct cifs_tcon *tcon;
589         struct TCP_Server_Info *server;
590         struct cifs_fid fid;
591         __u32 oplock;
592 
593         cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
594                  inode, direntry, direntry);
595 
596         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
597         rc = PTR_ERR(tlink);
598         if (IS_ERR(tlink))
599                 goto out_free_xid;
600 
601         tcon = tlink_tcon(tlink);
602         server = tcon->ses->server;
603 
604         if (server->ops->new_lease_key)
605                 server->ops->new_lease_key(&fid);
606 
607         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
608                             &oplock, &fid);
609         if (!rc && server->ops->close)
610                 server->ops->close(xid, tcon, &fid);
611 
612         cifs_put_tlink(tlink);
613 out_free_xid:
614         free_xid(xid);
615         return rc;
616 }
617 
618 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
619                 dev_t device_number)
620 {
621         int rc = -EPERM;
622         unsigned int xid;
623         struct cifs_sb_info *cifs_sb;
624         struct tcon_link *tlink;
625         struct cifs_tcon *tcon;
626         char *full_path = NULL;
627 
628         if (!old_valid_dev(device_number))
629                 return -EINVAL;
630 
631         cifs_sb = CIFS_SB(inode->i_sb);
632         tlink = cifs_sb_tlink(cifs_sb);
633         if (IS_ERR(tlink))
634                 return PTR_ERR(tlink);
635 
636         tcon = tlink_tcon(tlink);
637 
638         xid = get_xid();
639 
640         full_path = build_path_from_dentry(direntry);
641         if (full_path == NULL) {
642                 rc = -ENOMEM;
643                 goto mknod_out;
644         }
645 
646         rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
647                                                full_path, mode,
648                                                device_number);
649 
650 mknod_out:
651         kfree(full_path);
652         free_xid(xid);
653         cifs_put_tlink(tlink);
654         return rc;
655 }
656 
657 struct dentry *
658 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
659             unsigned int flags)
660 {
661         unsigned int xid;
662         int rc = 0; /* to get around spurious gcc warning, set to zero here */
663         struct cifs_sb_info *cifs_sb;
664         struct tcon_link *tlink;
665         struct cifs_tcon *pTcon;
666         struct inode *newInode = NULL;
667         char *full_path = NULL;
668 
669         xid = get_xid();
670 
671         cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
672                  parent_dir_inode, direntry, direntry);
673 
674         /* check whether path exists */
675 
676         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
677         tlink = cifs_sb_tlink(cifs_sb);
678         if (IS_ERR(tlink)) {
679                 free_xid(xid);
680                 return ERR_CAST(tlink);
681         }
682         pTcon = tlink_tcon(tlink);
683 
684         rc = check_name(direntry, pTcon);
685         if (unlikely(rc)) {
686                 cifs_put_tlink(tlink);
687                 free_xid(xid);
688                 return ERR_PTR(rc);
689         }
690 
691         /* can not grab the rename sem here since it would
692         deadlock in the cases (beginning of sys_rename itself)
693         in which we already have the sb rename sem */
694         full_path = build_path_from_dentry(direntry);
695         if (full_path == NULL) {
696                 cifs_put_tlink(tlink);
697                 free_xid(xid);
698                 return ERR_PTR(-ENOMEM);
699         }
700 
701         if (d_really_is_positive(direntry)) {
702                 cifs_dbg(FYI, "non-NULL inode in lookup\n");
703         } else {
704                 cifs_dbg(FYI, "NULL inode in lookup\n");
705         }
706         cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
707                  full_path, d_inode(direntry));
708 
709         if (pTcon->unix_ext) {
710                 rc = cifs_get_inode_info_unix(&newInode, full_path,
711                                               parent_dir_inode->i_sb, xid);
712         } else {
713                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
714                                 parent_dir_inode->i_sb, xid, NULL);
715         }
716 
717         if (rc == 0) {
718                 /* since paths are not looked up by component - the parent
719                    directories are presumed to be good here */
720                 renew_parental_timestamps(direntry);
721         } else if (rc == -ENOENT) {
722                 cifs_set_time(direntry, jiffies);
723                 newInode = NULL;
724         } else {
725                 if (rc != -EACCES) {
726                         cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
727                         /* We special case check for Access Denied - since that
728                         is a common return code */
729                 }
730                 newInode = ERR_PTR(rc);
731         }
732         kfree(full_path);
733         cifs_put_tlink(tlink);
734         free_xid(xid);
735         return d_splice_alias(newInode, direntry);
736 }
737 
738 static int
739 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
740 {
741         struct inode *inode;
742 
743         if (flags & LOOKUP_RCU)
744                 return -ECHILD;
745 
746         if (d_really_is_positive(direntry)) {
747                 inode = d_inode(direntry);
748                 if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
749                         CIFS_I(inode)->time = 0; /* force reval */
750 
751                 if (cifs_revalidate_dentry(direntry))
752                         return 0;
753                 else {
754                         /*
755                          * If the inode wasn't known to be a dfs entry when
756                          * the dentry was instantiated, such as when created
757                          * via ->readdir(), it needs to be set now since the
758                          * attributes will have been updated by
759                          * cifs_revalidate_dentry().
760                          */
761                         if (IS_AUTOMOUNT(inode) &&
762                            !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
763                                 spin_lock(&direntry->d_lock);
764                                 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
765                                 spin_unlock(&direntry->d_lock);
766                         }
767 
768                         return 1;
769                 }
770         }
771 
772         /*
773          * This may be nfsd (or something), anyway, we can't see the
774          * intent of this. So, since this can be for creation, drop it.
775          */
776         if (!flags)
777                 return 0;
778 
779         /*
780          * Drop the negative dentry, in order to make sure to use the
781          * case sensitive name which is specified by user if this is
782          * for creation.
783          */
784         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
785                 return 0;
786 
787         if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
788                 return 0;
789 
790         return 1;
791 }
792 
793 /* static int cifs_d_delete(struct dentry *direntry)
794 {
795         int rc = 0;
796 
797         cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
798 
799         return rc;
800 }     */
801 
802 const struct dentry_operations cifs_dentry_ops = {
803         .d_revalidate = cifs_d_revalidate,
804         .d_automount = cifs_dfs_d_automount,
805 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
806 };
807 
808 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
809 {
810         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
811         unsigned long hash;
812         wchar_t c;
813         int i, charlen;
814 
815         hash = init_name_hash(dentry);
816         for (i = 0; i < q->len; i += charlen) {
817                 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
818                 /* error out if we can't convert the character */
819                 if (unlikely(charlen < 0))
820                         return charlen;
821                 hash = partial_name_hash(cifs_toupper(c), hash);
822         }
823         q->hash = end_name_hash(hash);
824 
825         return 0;
826 }
827 
828 static int cifs_ci_compare(const struct dentry *dentry,
829                 unsigned int len, const char *str, const struct qstr *name)
830 {
831         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
832         wchar_t c1, c2;
833         int i, l1, l2;
834 
835         /*
836          * We make the assumption here that uppercase characters in the local
837          * codepage are always the same length as their lowercase counterparts.
838          *
839          * If that's ever not the case, then this will fail to match it.
840          */
841         if (name->len != len)
842                 return 1;
843 
844         for (i = 0; i < len; i += l1) {
845                 /* Convert characters in both strings to UTF-16. */
846                 l1 = codepage->char2uni(&str[i], len - i, &c1);
847                 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
848 
849                 /*
850                  * If we can't convert either character, just declare it to
851                  * be 1 byte long and compare the original byte.
852                  */
853                 if (unlikely(l1 < 0 && l2 < 0)) {
854                         if (str[i] != name->name[i])
855                                 return 1;
856                         l1 = 1;
857                         continue;
858                 }
859 
860                 /*
861                  * Here, we again ass|u|me that upper/lowercase versions of
862                  * a character are the same length in the local NLS.
863                  */
864                 if (l1 != l2)
865                         return 1;
866 
867                 /* Now compare uppercase versions of these characters */
868                 if (cifs_toupper(c1) != cifs_toupper(c2))
869                         return 1;
870         }
871 
872         return 0;
873 }
874 
875 const struct dentry_operations cifs_ci_dentry_ops = {
876         .d_revalidate = cifs_d_revalidate,
877         .d_hash = cifs_ci_hash,
878         .d_compare = cifs_ci_compare,
879         .d_automount = cifs_dfs_d_automount,
880 };
881 

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