~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.15-rc1 ] ~ [ linux-5.14.5 ] ~ [ linux-5.13.18 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.66 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.147 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.206 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.246 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.282 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.283 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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_ATOMIC);
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)
248                 return -ENOMEM;
249 
250         if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
251             (CIFS_UNIX_POSIX_PATH_OPS_CAP &
252                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
253                 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
254                                      oflags, oplock, &fid->netfid, xid);
255                 switch (rc) {
256                 case 0:
257                         if (newinode == NULL) {
258                                 /* query inode info */
259                                 goto cifs_create_get_file_info;
260                         }
261 
262                         if (S_ISDIR(newinode->i_mode)) {
263                                 CIFSSMBClose(xid, tcon, fid->netfid);
264                                 iput(newinode);
265                                 rc = -EISDIR;
266                                 goto out;
267                         }
268 
269                         if (!S_ISREG(newinode->i_mode)) {
270                                 /*
271                                  * The server may allow us to open things like
272                                  * FIFOs, but the client isn't set up to deal
273                                  * with that. If it's not a regular file, just
274                                  * close it and proceed as if it were a normal
275                                  * lookup.
276                                  */
277                                 CIFSSMBClose(xid, tcon, fid->netfid);
278                                 goto cifs_create_get_file_info;
279                         }
280                         /* success, no need to query */
281                         goto cifs_create_set_dentry;
282 
283                 case -ENOENT:
284                         goto cifs_create_get_file_info;
285 
286                 case -EIO:
287                 case -EINVAL:
288                         /*
289                          * EIO could indicate that (posix open) operation is not
290                          * supported, despite what server claimed in capability
291                          * negotiation.
292                          *
293                          * POSIX open in samba versions 3.3.1 and earlier could
294                          * incorrectly fail with invalid parameter.
295                          */
296                         tcon->broken_posix_open = true;
297                         break;
298 
299                 case -EREMOTE:
300                 case -EOPNOTSUPP:
301                         /*
302                          * EREMOTE indicates DFS junction, which is not handled
303                          * in posix open.  If either that or op not supported
304                          * returned, follow the normal lookup.
305                          */
306                         break;
307 
308                 default:
309                         goto out;
310                 }
311                 /*
312                  * fallthrough to retry, using older open call, this is case
313                  * where server does not support this SMB level, and falsely
314                  * claims capability (also get here for DFS case which should be
315                  * rare for path not covered on files)
316                  */
317         }
318 
319         desired_access = 0;
320         if (OPEN_FMODE(oflags) & FMODE_READ)
321                 desired_access |= GENERIC_READ; /* is this too little? */
322         if (OPEN_FMODE(oflags) & FMODE_WRITE)
323                 desired_access |= GENERIC_WRITE;
324 
325         disposition = FILE_OVERWRITE_IF;
326         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
327                 disposition = FILE_CREATE;
328         else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
329                 disposition = FILE_OVERWRITE_IF;
330         else if ((oflags & O_CREAT) == O_CREAT)
331                 disposition = FILE_OPEN_IF;
332         else
333                 cifs_dbg(FYI, "Create flag not set in create function\n");
334 
335         /*
336          * BB add processing to set equivalent of mode - e.g. via CreateX with
337          * ACLs
338          */
339 
340         if (!server->ops->open) {
341                 rc = -ENOSYS;
342                 goto out;
343         }
344 
345         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
346         if (buf == NULL) {
347                 rc = -ENOMEM;
348                 goto out;
349         }
350 
351         /*
352          * if we're not using unix extensions, see if we need to set
353          * ATTR_READONLY on the create call
354          */
355         if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
356                 create_options |= CREATE_OPTION_READONLY;
357 
358         oparms.tcon = tcon;
359         oparms.cifs_sb = cifs_sb;
360         oparms.desired_access = desired_access;
361         oparms.create_options = cifs_create_options(cifs_sb, create_options);
362         oparms.disposition = disposition;
363         oparms.path = full_path;
364         oparms.fid = fid;
365         oparms.reconnect = false;
366         oparms.mode = mode;
367         rc = server->ops->open(xid, &oparms, oplock, buf);
368         if (rc) {
369                 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
370                 goto out;
371         }
372 
373         /*
374          * If Open reported that we actually created a file then we now have to
375          * set the mode if possible.
376          */
377         if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
378                 struct cifs_unix_set_info_args args = {
379                                 .mode   = mode,
380                                 .ctime  = NO_CHANGE_64,
381                                 .atime  = NO_CHANGE_64,
382                                 .mtime  = NO_CHANGE_64,
383                                 .device = 0,
384                 };
385 
386                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
387                         args.uid = current_fsuid();
388                         if (inode->i_mode & S_ISGID)
389                                 args.gid = inode->i_gid;
390                         else
391                                 args.gid = current_fsgid();
392                 } else {
393                         args.uid = INVALID_UID; /* no change */
394                         args.gid = INVALID_GID; /* no change */
395                 }
396                 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
397                                        current->tgid);
398         } else {
399                 /*
400                  * BB implement mode setting via Windows security
401                  * descriptors e.g.
402                  */
403                 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
404 
405                 /* Could set r/o dos attribute if mode & 0222 == 0 */
406         }
407 
408 cifs_create_get_file_info:
409         /* server might mask mode so we have to query for it */
410         if (tcon->unix_ext)
411                 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
412                                               xid);
413         else {
414                 /* TODO: Add support for calling POSIX query info here, but passing in fid */
415                 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
416                                          xid, fid);
417                 if (newinode) {
418                         if (server->ops->set_lease_key)
419                                 server->ops->set_lease_key(newinode, fid);
420                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
421                                 newinode->i_mode = mode;
422                         if ((*oplock & CIFS_CREATE_ACTION) &&
423                             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
424                                 newinode->i_uid = current_fsuid();
425                                 if (inode->i_mode & S_ISGID)
426                                         newinode->i_gid = inode->i_gid;
427                                 else
428                                         newinode->i_gid = current_fsgid();
429                         }
430                 }
431         }
432 
433 cifs_create_set_dentry:
434         if (rc != 0) {
435                 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
436                          rc);
437                 goto out_err;
438         }
439 
440         if (S_ISDIR(newinode->i_mode)) {
441                 rc = -EISDIR;
442                 goto out_err;
443         }
444 
445         d_drop(direntry);
446         d_add(direntry, newinode);
447 
448 out:
449         kfree(buf);
450         kfree(full_path);
451         return rc;
452 
453 out_err:
454         if (server->ops->close)
455                 server->ops->close(xid, tcon, fid);
456         if (newinode)
457                 iput(newinode);
458         goto out;
459 }
460 
461 int
462 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
463                  struct file *file, unsigned oflags, umode_t mode)
464 {
465         int rc;
466         unsigned int xid;
467         struct tcon_link *tlink;
468         struct cifs_tcon *tcon;
469         struct TCP_Server_Info *server;
470         struct cifs_fid fid;
471         struct cifs_pending_open open;
472         __u32 oplock;
473         struct cifsFileInfo *file_info;
474 
475         /*
476          * Posix open is only called (at lookup time) for file create now. For
477          * opens (rather than creates), because we do not know if it is a file
478          * or directory yet, and current Samba no longer allows us to do posix
479          * open on dirs, we could end up wasting an open call on what turns out
480          * to be a dir. For file opens, we wait to call posix open till
481          * cifs_open.  It could be added to atomic_open in the future but the
482          * performance tradeoff of the extra network request when EISDIR or
483          * EACCES is returned would have to be weighed against the 50% reduction
484          * in network traffic in the other paths.
485          */
486         if (!(oflags & O_CREAT)) {
487                 struct dentry *res;
488 
489                 /*
490                  * Check for hashed negative dentry. We have already revalidated
491                  * the dentry and it is fine. No need to perform another lookup.
492                  */
493                 if (!d_in_lookup(direntry))
494                         return -ENOENT;
495 
496                 res = cifs_lookup(inode, direntry, 0);
497                 if (IS_ERR(res))
498                         return PTR_ERR(res);
499 
500                 return finish_no_open(file, res);
501         }
502 
503         xid = get_xid();
504 
505         cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
506                  inode, direntry, direntry);
507 
508         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
509         if (IS_ERR(tlink)) {
510                 rc = PTR_ERR(tlink);
511                 goto out_free_xid;
512         }
513 
514         tcon = tlink_tcon(tlink);
515 
516         rc = check_name(direntry, tcon);
517         if (rc)
518                 goto out;
519 
520         server = tcon->ses->server;
521 
522         if (server->ops->new_lease_key)
523                 server->ops->new_lease_key(&fid);
524 
525         cifs_add_pending_open(&fid, tlink, &open);
526 
527         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
528                             &oplock, &fid);
529 
530         if (rc) {
531                 cifs_del_pending_open(&open);
532                 goto out;
533         }
534 
535         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
536                 file->f_mode |= FMODE_CREATED;
537 
538         rc = finish_open(file, direntry, generic_file_open);
539         if (rc) {
540                 if (server->ops->close)
541                         server->ops->close(xid, tcon, &fid);
542                 cifs_del_pending_open(&open);
543                 goto out;
544         }
545 
546         if (file->f_flags & O_DIRECT &&
547             CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
548                 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
549                         file->f_op = &cifs_file_direct_nobrl_ops;
550                 else
551                         file->f_op = &cifs_file_direct_ops;
552                 }
553 
554         file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
555         if (file_info == NULL) {
556                 if (server->ops->close)
557                         server->ops->close(xid, tcon, &fid);
558                 cifs_del_pending_open(&open);
559                 rc = -ENOMEM;
560         }
561 
562 out:
563         cifs_put_tlink(tlink);
564 out_free_xid:
565         free_xid(xid);
566         return rc;
567 }
568 
569 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
570                 bool excl)
571 {
572         int rc;
573         unsigned int xid = get_xid();
574         /*
575          * BB below access is probably too much for mknod to request
576          *    but we have to do query and setpathinfo so requesting
577          *    less could fail (unless we want to request getatr and setatr
578          *    permissions (only).  At least for POSIX we do not have to
579          *    request so much.
580          */
581         unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
582         struct tcon_link *tlink;
583         struct cifs_tcon *tcon;
584         struct TCP_Server_Info *server;
585         struct cifs_fid fid;
586         __u32 oplock;
587 
588         cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
589                  inode, direntry, direntry);
590 
591         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
592         rc = PTR_ERR(tlink);
593         if (IS_ERR(tlink))
594                 goto out_free_xid;
595 
596         tcon = tlink_tcon(tlink);
597         server = tcon->ses->server;
598 
599         if (server->ops->new_lease_key)
600                 server->ops->new_lease_key(&fid);
601 
602         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
603                             &oplock, &fid);
604         if (!rc && server->ops->close)
605                 server->ops->close(xid, tcon, &fid);
606 
607         cifs_put_tlink(tlink);
608 out_free_xid:
609         free_xid(xid);
610         return rc;
611 }
612 
613 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
614                 dev_t device_number)
615 {
616         int rc = -EPERM;
617         unsigned int xid;
618         struct cifs_sb_info *cifs_sb;
619         struct tcon_link *tlink;
620         struct cifs_tcon *tcon;
621         char *full_path = NULL;
622 
623         if (!old_valid_dev(device_number))
624                 return -EINVAL;
625 
626         cifs_sb = CIFS_SB(inode->i_sb);
627         tlink = cifs_sb_tlink(cifs_sb);
628         if (IS_ERR(tlink))
629                 return PTR_ERR(tlink);
630 
631         tcon = tlink_tcon(tlink);
632 
633         xid = get_xid();
634 
635         full_path = build_path_from_dentry(direntry);
636         if (full_path == NULL) {
637                 rc = -ENOMEM;
638                 goto mknod_out;
639         }
640 
641         rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
642                                                full_path, mode,
643                                                device_number);
644 
645 mknod_out:
646         kfree(full_path);
647         free_xid(xid);
648         cifs_put_tlink(tlink);
649         return rc;
650 }
651 
652 struct dentry *
653 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
654             unsigned int flags)
655 {
656         unsigned int xid;
657         int rc = 0; /* to get around spurious gcc warning, set to zero here */
658         struct cifs_sb_info *cifs_sb;
659         struct tcon_link *tlink;
660         struct cifs_tcon *pTcon;
661         struct inode *newInode = NULL;
662         char *full_path = NULL;
663 
664         xid = get_xid();
665 
666         cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
667                  parent_dir_inode, direntry, direntry);
668 
669         /* check whether path exists */
670 
671         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
672         tlink = cifs_sb_tlink(cifs_sb);
673         if (IS_ERR(tlink)) {
674                 free_xid(xid);
675                 return ERR_CAST(tlink);
676         }
677         pTcon = tlink_tcon(tlink);
678 
679         rc = check_name(direntry, pTcon);
680         if (unlikely(rc)) {
681                 cifs_put_tlink(tlink);
682                 free_xid(xid);
683                 return ERR_PTR(rc);
684         }
685 
686         /* can not grab the rename sem here since it would
687         deadlock in the cases (beginning of sys_rename itself)
688         in which we already have the sb rename sem */
689         full_path = build_path_from_dentry(direntry);
690         if (full_path == NULL) {
691                 cifs_put_tlink(tlink);
692                 free_xid(xid);
693                 return ERR_PTR(-ENOMEM);
694         }
695 
696         if (d_really_is_positive(direntry)) {
697                 cifs_dbg(FYI, "non-NULL inode in lookup\n");
698         } else {
699                 cifs_dbg(FYI, "NULL inode in lookup\n");
700         }
701         cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
702                  full_path, d_inode(direntry));
703 
704         if (pTcon->posix_extensions)
705                 rc = smb311_posix_get_inode_info(&newInode, full_path, parent_dir_inode->i_sb, xid);
706         else if (pTcon->unix_ext) {
707                 rc = cifs_get_inode_info_unix(&newInode, full_path,
708                                               parent_dir_inode->i_sb, xid);
709         } else {
710                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
711                                 parent_dir_inode->i_sb, xid, NULL);
712         }
713 
714         if (rc == 0) {
715                 /* since paths are not looked up by component - the parent
716                    directories are presumed to be good here */
717                 renew_parental_timestamps(direntry);
718         } else if (rc == -ENOENT) {
719                 cifs_set_time(direntry, jiffies);
720                 newInode = NULL;
721         } else {
722                 if (rc != -EACCES) {
723                         cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
724                         /* We special case check for Access Denied - since that
725                         is a common return code */
726                 }
727                 newInode = ERR_PTR(rc);
728         }
729         kfree(full_path);
730         cifs_put_tlink(tlink);
731         free_xid(xid);
732         return d_splice_alias(newInode, direntry);
733 }
734 
735 static int
736 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
737 {
738         struct inode *inode;
739 
740         if (flags & LOOKUP_RCU)
741                 return -ECHILD;
742 
743         if (d_really_is_positive(direntry)) {
744                 inode = d_inode(direntry);
745                 if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
746                         CIFS_I(inode)->time = 0; /* force reval */
747 
748                 if (cifs_revalidate_dentry(direntry))
749                         return 0;
750                 else {
751                         /*
752                          * If the inode wasn't known to be a dfs entry when
753                          * the dentry was instantiated, such as when created
754                          * via ->readdir(), it needs to be set now since the
755                          * attributes will have been updated by
756                          * cifs_revalidate_dentry().
757                          */
758                         if (IS_AUTOMOUNT(inode) &&
759                            !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
760                                 spin_lock(&direntry->d_lock);
761                                 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
762                                 spin_unlock(&direntry->d_lock);
763                         }
764 
765                         return 1;
766                 }
767         }
768 
769         /*
770          * This may be nfsd (or something), anyway, we can't see the
771          * intent of this. So, since this can be for creation, drop it.
772          */
773         if (!flags)
774                 return 0;
775 
776         /*
777          * Drop the negative dentry, in order to make sure to use the
778          * case sensitive name which is specified by user if this is
779          * for creation.
780          */
781         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
782                 return 0;
783 
784         if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
785                 return 0;
786 
787         return 1;
788 }
789 
790 /* static int cifs_d_delete(struct dentry *direntry)
791 {
792         int rc = 0;
793 
794         cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
795 
796         return rc;
797 }     */
798 
799 const struct dentry_operations cifs_dentry_ops = {
800         .d_revalidate = cifs_d_revalidate,
801         .d_automount = cifs_dfs_d_automount,
802 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
803 };
804 
805 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
806 {
807         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
808         unsigned long hash;
809         wchar_t c;
810         int i, charlen;
811 
812         hash = init_name_hash(dentry);
813         for (i = 0; i < q->len; i += charlen) {
814                 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
815                 /* error out if we can't convert the character */
816                 if (unlikely(charlen < 0))
817                         return charlen;
818                 hash = partial_name_hash(cifs_toupper(c), hash);
819         }
820         q->hash = end_name_hash(hash);
821 
822         return 0;
823 }
824 
825 static int cifs_ci_compare(const struct dentry *dentry,
826                 unsigned int len, const char *str, const struct qstr *name)
827 {
828         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
829         wchar_t c1, c2;
830         int i, l1, l2;
831 
832         /*
833          * We make the assumption here that uppercase characters in the local
834          * codepage are always the same length as their lowercase counterparts.
835          *
836          * If that's ever not the case, then this will fail to match it.
837          */
838         if (name->len != len)
839                 return 1;
840 
841         for (i = 0; i < len; i += l1) {
842                 /* Convert characters in both strings to UTF-16. */
843                 l1 = codepage->char2uni(&str[i], len - i, &c1);
844                 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
845 
846                 /*
847                  * If we can't convert either character, just declare it to
848                  * be 1 byte long and compare the original byte.
849                  */
850                 if (unlikely(l1 < 0 && l2 < 0)) {
851                         if (str[i] != name->name[i])
852                                 return 1;
853                         l1 = 1;
854                         continue;
855                 }
856 
857                 /*
858                  * Here, we again ass|u|me that upper/lowercase versions of
859                  * a character are the same length in the local NLS.
860                  */
861                 if (l1 != l2)
862                         return 1;
863 
864                 /* Now compare uppercase versions of these characters */
865                 if (cifs_toupper(c1) != cifs_toupper(c2))
866                         return 1;
867         }
868 
869         return 0;
870 }
871 
872 const struct dentry_operations cifs_ci_dentry_ops = {
873         .d_revalidate = cifs_d_revalidate,
874         .d_hash = cifs_ci_hash,
875         .d_compare = cifs_ci_compare,
876         .d_automount = cifs_dfs_d_automount,
877 };
878 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp