fs/cifs/dir.c

   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
  36 static void
  37 renew_parental_timestamps(struct dentry *direntry)
  38 {
  39         /* BB check if there is a way to get the kernel to do this or if we
  40            really need this */
  41         do {
  42                 direntry->d_time = jiffies;
  43                 direntry = direntry->d_parent;
  44         } while (!IS_ROOT(direntry));
  45 }
  46
  47 char *
  48 cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
  49                         struct cifs_tcon *tcon)
  50 {
  51         int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
  52         int dfsplen;
  53         char *full_path = NULL;
  54
  55         /* if no prefix path, simply set path to the root of share to "" */
  56         if (pplen == 0) {
  57                 full_path = kzalloc(1, GFP_KERNEL);
  58                 return full_path;
  59         }
  60
  61         if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
  62                 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
  63         else
  64                 dfsplen = 0;
  65
  66         full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
  67         if (full_path == NULL)
  68                 return full_path;
  69
  70         if (dfsplen)
  71                 strncpy(full_path, tcon->treeName, dfsplen);
  72         full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
  73         strncpy(full_path + dfsplen + 1, vol->prepath, pplen);
  74         convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
  75         full_path[dfsplen + pplen] = 0; /* add trailing null */
  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 dentry *temp;
  84         int namelen;
  85         int dfsplen;
  86         char *full_path;
  87         char dirsep;
  88         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
  89         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
  90         unsigned seq;
  91
  92         dirsep = CIFS_DIR_SEP(cifs_sb);
  93         if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
  94                 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
  95         else
  96                 dfsplen = 0;
  97 cifs_bp_rename_retry:
  98         namelen = dfsplen;
  99         seq = read_seqbegin(&rename_lock);
 100         rcu_read_lock();
 101         for (temp = direntry; !IS_ROOT(temp);) {
 102                 namelen += (1 + temp->d_name.len);
 103                 temp = temp->d_parent;
 104                 if (temp == NULL) {
 105                         cifs_dbg(VFS, "corrupt dentry\n");
 106                         rcu_read_unlock();
 107                         return NULL;
 108                 }
 109         }
 110         rcu_read_unlock();
 111
 112         full_path = kmalloc(namelen+1, GFP_KERNEL);
 113         if (full_path == NULL)
 114                 return full_path;
 115         full_path[namelen] = 0; /* trailing null */
 116         rcu_read_lock();
 117         for (temp = direntry; !IS_ROOT(temp);) {
 118                 spin_lock(&temp->d_lock);
 119                 namelen -= 1 + temp->d_name.len;
 120                 if (namelen < 0) {
 121                         spin_unlock(&temp->d_lock);
 122                         break;
 123                 } else {
 124                         full_path[namelen] = dirsep;
 125                         strncpy(full_path + namelen + 1, temp->d_name.name,
 126                                 temp->d_name.len);
 127                         cifs_dbg(FYI, "name: %s\n", full_path + namelen);
 128                 }
 129                 spin_unlock(&temp->d_lock);
 130                 temp = temp->d_parent;
 131                 if (temp == NULL) {
 132                         cifs_dbg(VFS, "corrupt dentry\n");
 133                         rcu_read_unlock();
 134                         kfree(full_path);
 135                         return NULL;
 136                 }
 137         }
 138         rcu_read_unlock();
 139         if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
 140                 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
 141                          namelen, dfsplen);
 142                 /* presumably this is only possible if racing with a rename
 143                 of one of the parent directories  (we can not lock the dentries
 144                 above us to prevent this, but retrying should be harmless) */
 145                 kfree(full_path);
 146                 goto cifs_bp_rename_retry;
 147         }
 148         /* DIR_SEP already set for byte  0 / vs \ but not for
 149            subsequent slashes in prepath which currently must
 150            be entered the right way - not sure if there is an alternative
 151            since the '\' is a valid posix character so we can not switch
 152            those safely to '/' if any are found in the middle of the prepath */
 153         /* BB test paths to Windows with '/' in the midst of prepath */
 154
 155         if (dfsplen) {
 156                 strncpy(full_path, tcon->treeName, dfsplen);
 157                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
 158                         int i;
 159                         for (i = 0; i < dfsplen; i++) {
 160                                 if (full_path[i] == '\\')
 161                                         full_path[i] = '/';
 162                         }
 163                 }
 164         }
 165         return full_path;
 166 }
 167
 168 /*
 169  * Don't allow the separator character in a path component.
 170  * The VFS will not allow "/", but "\" is allowed by posix.
 171  */
 172 static int
 173 check_name(struct dentry *direntry)
 174 {
 175         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
 176         int i;
 177
 178         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
 179                 for (i = 0; i < direntry->d_name.len; i++) {
 180                         if (direntry->d_name.name[i] == '\\') {
 181                                 cifs_dbg(FYI, "Invalid file name\n");
 182                                 return -EINVAL;
 183                         }
 184                 }
 185         }
 186         return 0;
 187 }
 188
 189
 190 /* Inode operations in similar order to how they appear in Linux file fs.h */
 191
 192 static int
 193 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
 194                struct tcon_link *tlink, unsigned oflags, umode_t mode,
 195                __u32 *oplock, struct cifs_fid *fid, int *created)
 196 {
 197         int rc = -ENOENT;
 198         int create_options = CREATE_NOT_DIR;
 199         int desired_access;
 200         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 201         struct cifs_tcon *tcon = tlink_tcon(tlink);
 202         char *full_path = NULL;
 203         FILE_ALL_INFO *buf = NULL;
 204         struct inode *newinode = NULL;
 205         int disposition;
 206         struct TCP_Server_Info *server = tcon->ses->server;
 207
 208         *oplock = 0;
 209         if (tcon->ses->server->oplocks)
 210                 *oplock = REQ_OPLOCK;
 211
 212         full_path = build_path_from_dentry(direntry);
 213         if (full_path == NULL) {
 214                 rc = -ENOMEM;
 215                 goto out;
 216         }
 217
 218         if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
 219             (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 220                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 221                 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
 222                                      oflags, oplock, &fid->netfid, xid);
 223                 switch (rc) {
 224                 case 0:
 225                         if (newinode == NULL) {
 226                                 /* query inode info */
 227                                 goto cifs_create_get_file_info;
 228                         }
 229
 230                         if (!S_ISREG(newinode->i_mode)) {
 231                                 /*
 232                                  * The server may allow us to open things like
 233                                  * FIFOs, but the client isn't set up to deal
 234                                  * with that. If it's not a regular file, just
 235                                  * close it and proceed as if it were a normal
 236                                  * lookup.
 237                                  */
 238                                 CIFSSMBClose(xid, tcon, fid->netfid);
 239                                 goto cifs_create_get_file_info;
 240                         }
 241                         /* success, no need to query */
 242                         goto cifs_create_set_dentry;
 243
 244                 case -ENOENT:
 245                         goto cifs_create_get_file_info;
 246
 247                 case -EIO:
 248                 case -EINVAL:
 249                         /*
 250                          * EIO could indicate that (posix open) operation is not
 251                          * supported, despite what server claimed in capability
 252                          * negotiation.
 253                          *
 254                          * POSIX open in samba versions 3.3.1 and earlier could
 255                          * incorrectly fail with invalid parameter.
 256                          */
 257                         tcon->broken_posix_open = true;
 258                         break;
 259
 260                 case -EREMOTE:
 261                 case -EOPNOTSUPP:
 262                         /*
 263                          * EREMOTE indicates DFS junction, which is not handled
 264                          * in posix open.  If either that or op not supported
 265                          * returned, follow the normal lookup.
 266                          */
 267                         break;
 268
 269                 default:
 270                         goto out;
 271                 }
 272                 /*
 273                  * fallthrough to retry, using older open call, this is case
 274                  * where server does not support this SMB level, and falsely
 275                  * claims capability (also get here for DFS case which should be
 276                  * rare for path not covered on files)
 277                  */
 278         }
 279
 280         desired_access = 0;
 281         if (OPEN_FMODE(oflags) & FMODE_READ)
 282                 desired_access |= GENERIC_READ; /* is this too little? */
 283         if (OPEN_FMODE(oflags) & FMODE_WRITE)
 284                 desired_access |= GENERIC_WRITE;
 285
 286         disposition = FILE_OVERWRITE_IF;
 287         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
 288                 disposition = FILE_CREATE;
 289         else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
 290                 disposition = FILE_OVERWRITE_IF;
 291         else if ((oflags & O_CREAT) == O_CREAT)
 292                 disposition = FILE_OPEN_IF;
 293         else
 294                 cifs_dbg(FYI, "Create flag not set in create function\n");
 295
 296         /*
 297          * BB add processing to set equivalent of mode - e.g. via CreateX with
 298          * ACLs
 299          */
 300
 301         if (!server->ops->open) {
 302                 rc = -ENOSYS;
 303                 goto out;
 304         }
 305
 306         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 307         if (buf == NULL) {
 308                 rc = -ENOMEM;
 309                 goto out;
 310         }
 311
 312         /*
 313          * if we're not using unix extensions, see if we need to set
 314          * ATTR_READONLY on the create call
 315          */
 316         if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
 317                 create_options |= CREATE_OPTION_READONLY;
 318
 319         if (backup_cred(cifs_sb))
 320                 create_options |= CREATE_OPEN_BACKUP_INTENT;
 321
 322         rc = server->ops->open(xid, tcon, full_path, disposition,
 323                                desired_access, create_options, fid, oplock,
 324                                buf, cifs_sb);
 325         if (rc) {
 326                 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
 327                 goto out;
 328         }
 329
 330         /*
 331          * If Open reported that we actually created a file then we now have to
 332          * set the mode if possible.
 333          */
 334         if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
 335                 struct cifs_unix_set_info_args args = {
 336                                 .mode   = mode,
 337                                 .ctime  = NO_CHANGE_64,
 338                                 .atime  = NO_CHANGE_64,
 339                                 .mtime  = NO_CHANGE_64,
 340                                 .device = 0,
 341                 };
 342
 343                 *created |= FILE_CREATED;
 344                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 345                         args.uid = current_fsuid();
 346                         if (inode->i_mode & S_ISGID)
 347                                 args.gid = inode->i_gid;
 348                         else
 349                                 args.gid = current_fsgid();
 350                 } else {
 351                         args.uid = INVALID_UID; /* no change */
 352                         args.gid = INVALID_GID; /* no change */
 353                 }
 354                 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
 355                                        current->tgid);
 356         } else {
 357                 /*
 358                  * BB implement mode setting via Windows security
 359                  * descriptors e.g.
 360                  */
 361                 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
 362
 363                 /* Could set r/o dos attribute if mode & 0222 == 0 */
 364         }
 365
 366 cifs_create_get_file_info:
 367         /* server might mask mode so we have to query for it */
 368         if (tcon->unix_ext)
 369                 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
 370                                               xid);
 371         else {
 372                 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
 373                                          xid, &fid->netfid);
 374                 if (newinode) {
 375                         if (server->ops->set_lease_key)
 376                                 server->ops->set_lease_key(newinode, fid);
 377                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 378                                 newinode->i_mode = mode;
 379                         if ((*oplock & CIFS_CREATE_ACTION) &&
 380                             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
 381                                 newinode->i_uid = current_fsuid();
 382                                 if (inode->i_mode & S_ISGID)
 383                                         newinode->i_gid = inode->i_gid;
 384                                 else
 385                                         newinode->i_gid = current_fsgid();
 386                         }
 387                 }
 388         }
 389
 390 cifs_create_set_dentry:
 391         if (rc != 0) {
 392                 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
 393                          rc);
 394                 if (server->ops->close)
 395                         server->ops->close(xid, tcon, fid);
 396                 goto out;
 397         }
 398         d_drop(direntry);
 399         d_add(direntry, newinode);
 400
 401 out:
 402         kfree(buf);
 403         kfree(full_path);
 404         return rc;
 405 }
 406
 407 int
 408 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
 409                  struct file *file, unsigned oflags, umode_t mode,
 410                  int *opened)
 411 {
 412         int rc;
 413         unsigned int xid;
 414         struct tcon_link *tlink;
 415         struct cifs_tcon *tcon;
 416         struct TCP_Server_Info *server;
 417         struct cifs_fid fid;
 418         struct cifs_pending_open open;
 419         __u32 oplock;
 420         struct cifsFileInfo *file_info;
 421
 422         /*
 423          * Posix open is only called (at lookup time) for file create now. For
 424          * opens (rather than creates), because we do not know if it is a file
 425          * or directory yet, and current Samba no longer allows us to do posix
 426          * open on dirs, we could end up wasting an open call on what turns out
 427          * to be a dir. For file opens, we wait to call posix open till
 428          * cifs_open.  It could be added to atomic_open in the future but the
 429          * performance tradeoff of the extra network request when EISDIR or
 430          * EACCES is returned would have to be weighed against the 50% reduction
 431          * in network traffic in the other paths.
 432          */
 433         if (!(oflags & O_CREAT)) {
 434                 struct dentry *res;
 435
 436                 /*
 437                  * Check for hashed negative dentry. We have already revalidated
 438                  * the dentry and it is fine. No need to perform another lookup.
 439                  */
 440                 if (!d_unhashed(direntry))
 441                         return -ENOENT;
 442
 443                 res = cifs_lookup(inode, direntry, 0);
 444                 if (IS_ERR(res))
 445                         return PTR_ERR(res);
 446
 447                 return finish_no_open(file, res);
 448         }
 449
 450         rc = check_name(direntry);
 451         if (rc)
 452                 return rc;
 453
 454         xid = get_xid();
 455
 456         cifs_dbg(FYI, "parent inode = 0x%p name is: %s and dentry = 0x%p\n",
 457                  inode, direntry->d_name.name, direntry);
 458
 459         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
 460         if (IS_ERR(tlink))
 461                 goto out_free_xid;
 462
 463         tcon = tlink_tcon(tlink);
 464         server = tcon->ses->server;
 465
 466         if (server->ops->new_lease_key)
 467                 server->ops->new_lease_key(&fid);
 468
 469         cifs_add_pending_open(&fid, tlink, &open);
 470
 471         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
 472                             &oplock, &fid, opened);
 473
 474         if (rc) {
 475                 cifs_del_pending_open(&open);
 476                 goto out;
 477         }
 478
 479         rc = finish_open(file, direntry, generic_file_open, opened);
 480         if (rc) {
 481                 if (server->ops->close)
 482                         server->ops->close(xid, tcon, &fid);
 483                 cifs_del_pending_open(&open);
 484                 goto out;
 485         }
 486
 487         file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
 488         if (file_info == NULL) {
 489                 if (server->ops->close)
 490                         server->ops->close(xid, tcon, &fid);
 491                 cifs_del_pending_open(&open);
 492                 rc = -ENOMEM;
 493         }
 494
 495 out:
 496         cifs_put_tlink(tlink);
 497 out_free_xid:
 498         free_xid(xid);
 499         return rc;
 500 }
 501
 502 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
 503                 bool excl)
 504 {
 505         int rc;
 506         unsigned int xid = get_xid();
 507         /*
 508          * BB below access is probably too much for mknod to request
 509          *    but we have to do query and setpathinfo so requesting
 510          *    less could fail (unless we want to request getatr and setatr
 511          *    permissions (only).  At least for POSIX we do not have to
 512          *    request so much.
 513          */
 514         unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
 515         struct tcon_link *tlink;
 516         struct cifs_tcon *tcon;
 517         struct TCP_Server_Info *server;
 518         struct cifs_fid fid;
 519         __u32 oplock;
 520         int created = FILE_CREATED;
 521
 522         cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %s and dentry = 0x%p\n",
 523                  inode, direntry->d_name.name, direntry);
 524
 525         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
 526         rc = PTR_ERR(tlink);
 527         if (IS_ERR(tlink))
 528                 goto out_free_xid;
 529
 530         tcon = tlink_tcon(tlink);
 531         server = tcon->ses->server;
 532
 533         if (server->ops->new_lease_key)
 534                 server->ops->new_lease_key(&fid);
 535
 536         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
 537                             &oplock, &fid, &created);
 538         if (!rc && server->ops->close)
 539                 server->ops->close(xid, tcon, &fid);
 540
 541         cifs_put_tlink(tlink);
 542 out_free_xid:
 543         free_xid(xid);
 544         return rc;
 545 }
 546
 547 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
 548                 dev_t device_number)
 549 {
 550         int rc = -EPERM;
 551         unsigned int xid;
 552         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
 553         struct cifs_sb_info *cifs_sb;
 554         struct tcon_link *tlink;
 555         struct cifs_tcon *pTcon;
 556         struct cifs_io_parms io_parms;
 557         char *full_path = NULL;
 558         struct inode *newinode = NULL;
 559         int oplock = 0;
 560         u16 fileHandle;
 561         FILE_ALL_INFO *buf = NULL;
 562         unsigned int bytes_written;
 563         struct win_dev *pdev;
 564
 565         if (!old_valid_dev(device_number))
 566                 return -EINVAL;
 567
 568         cifs_sb = CIFS_SB(inode->i_sb);
 569         tlink = cifs_sb_tlink(cifs_sb);
 570         if (IS_ERR(tlink))
 571                 return PTR_ERR(tlink);
 572
 573         pTcon = tlink_tcon(tlink);
 574
 575         xid = get_xid();
 576
 577         full_path = build_path_from_dentry(direntry);
 578         if (full_path == NULL) {
 579                 rc = -ENOMEM;
 580                 goto mknod_out;
 581         }
 582
 583         if (pTcon->unix_ext) {
 584                 struct cifs_unix_set_info_args args = {
 585                         .mode   = mode & ~current_umask(),
 586                         .ctime  = NO_CHANGE_64,
 587                         .atime  = NO_CHANGE_64,
 588                         .mtime  = NO_CHANGE_64,
 589                         .device = device_number,
 590                 };
 591                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 592                         args.uid = current_fsuid();
 593                         args.gid = current_fsgid();
 594                 } else {
 595                         args.uid = INVALID_UID; /* no change */
 596                         args.gid = INVALID_GID; /* no change */
 597                 }
 598                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
 599                                             cifs_sb->local_nls,
 600                                             cifs_sb->mnt_cifs_flags &
 601                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 602                 if (rc)
 603                         goto mknod_out;
 604
 605                 rc = cifs_get_inode_info_unix(&newinode, full_path,
 606                                                 inode->i_sb, xid);
 607
 608                 if (rc == 0)
 609                         d_instantiate(direntry, newinode);
 610                 goto mknod_out;
 611         }
 612
 613         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
 614                 goto mknod_out;
 615
 616
 617         cifs_dbg(FYI, "sfu compat create special file\n");
 618
 619         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 620         if (buf == NULL) {
 621                 kfree(full_path);
 622                 rc = -ENOMEM;
 623                 free_xid(xid);
 624                 return rc;
 625         }
 626
 627         if (backup_cred(cifs_sb))
 628                 create_options |= CREATE_OPEN_BACKUP_INTENT;
 629
 630         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
 631                          GENERIC_WRITE, create_options,
 632                          &fileHandle, &oplock, buf, cifs_sb->local_nls,
 633                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 634         if (rc)
 635                 goto mknod_out;
 636
 637         /* BB Do not bother to decode buf since no local inode yet to put
 638          * timestamps in, but we can reuse it safely */
 639
 640         pdev = (struct win_dev *)buf;
 641         io_parms.netfid = fileHandle;
 642         io_parms.pid = current->tgid;
 643         io_parms.tcon = pTcon;
 644         io_parms.offset = 0;
 645         io_parms.length = sizeof(struct win_dev);
 646         if (S_ISCHR(mode)) {
 647                 memcpy(pdev->type, "IntxCHR", 8);
 648                 pdev->major =
 649                       cpu_to_le64(MAJOR(device_number));
 650                 pdev->minor =
 651                       cpu_to_le64(MINOR(device_number));
 652                 rc = CIFSSMBWrite(xid, &io_parms,
 653                         &bytes_written, (char *)pdev,
 654                         NULL, 0);
 655         } else if (S_ISBLK(mode)) {
 656                 memcpy(pdev->type, "IntxBLK", 8);
 657                 pdev->major =
 658                       cpu_to_le64(MAJOR(device_number));
 659                 pdev->minor =
 660                       cpu_to_le64(MINOR(device_number));
 661                 rc = CIFSSMBWrite(xid, &io_parms,
 662                         &bytes_written, (char *)pdev,
 663                         NULL, 0);
 664         } /* else if (S_ISFIFO) */
 665         CIFSSMBClose(xid, pTcon, fileHandle);
 666         d_drop(direntry);
 667
 668         /* FIXME: add code here to set EAs */
 669
 670 mknod_out:
 671         kfree(full_path);
 672         kfree(buf);
 673         free_xid(xid);
 674         cifs_put_tlink(tlink);
 675         return rc;
 676 }
 677
 678 struct dentry *
 679 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 680             unsigned int flags)
 681 {
 682         unsigned int xid;
 683         int rc = 0; /* to get around spurious gcc warning, set to zero here */
 684         struct cifs_sb_info *cifs_sb;
 685         struct tcon_link *tlink;
 686         struct cifs_tcon *pTcon;
 687         struct inode *newInode = NULL;
 688         char *full_path = NULL;
 689
 690         xid = get_xid();
 691
 692         cifs_dbg(FYI, "parent inode = 0x%p name is: %s and dentry = 0x%p\n",
 693                  parent_dir_inode, direntry->d_name.name, direntry);
 694
 695         /* check whether path exists */
 696
 697         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
 698         tlink = cifs_sb_tlink(cifs_sb);
 699         if (IS_ERR(tlink)) {
 700                 free_xid(xid);
 701                 return (struct dentry *)tlink;
 702         }
 703         pTcon = tlink_tcon(tlink);
 704
 705         rc = check_name(direntry);
 706         if (rc)
 707                 goto lookup_out;
 708
 709         /* can not grab the rename sem here since it would
 710         deadlock in the cases (beginning of sys_rename itself)
 711         in which we already have the sb rename sem */
 712         full_path = build_path_from_dentry(direntry);
 713         if (full_path == NULL) {
 714                 rc = -ENOMEM;
 715                 goto lookup_out;
 716         }
 717
 718         if (direntry->d_inode != NULL) {
 719                 cifs_dbg(FYI, "non-NULL inode in lookup\n");
 720         } else {
 721                 cifs_dbg(FYI, "NULL inode in lookup\n");
 722         }
 723         cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
 724                  full_path, direntry->d_inode);
 725
 726         if (pTcon->unix_ext) {
 727                 rc = cifs_get_inode_info_unix(&newInode, full_path,
 728                                               parent_dir_inode->i_sb, xid);
 729         } else {
 730                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
 731                                 parent_dir_inode->i_sb, xid, NULL);
 732         }
 733
 734         if ((rc == 0) && (newInode != NULL)) {
 735                 d_add(direntry, newInode);
 736                 /* since paths are not looked up by component - the parent
 737                    directories are presumed to be good here */
 738                 renew_parental_timestamps(direntry);
 739
 740         } else if (rc == -ENOENT) {
 741                 rc = 0;
 742                 direntry->d_time = jiffies;
 743                 d_add(direntry, NULL);
 744         /*      if it was once a directory (but how can we tell?) we could do
 745                 shrink_dcache_parent(direntry); */
 746         } else if (rc != -EACCES) {
 747                 cifs_dbg(VFS, "Unexpected lookup error %d\n", rc);
 748                 /* We special case check for Access Denied - since that
 749                 is a common return code */
 750         }
 751
 752 lookup_out:
 753         kfree(full_path);
 754         cifs_put_tlink(tlink);
 755         free_xid(xid);
 756         return ERR_PTR(rc);
 757 }
 758
 759 static int
 760 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
 761 {
 762         if (flags & LOOKUP_RCU)
 763                 return -ECHILD;
 764
 765         if (direntry->d_inode) {
 766                 if (cifs_revalidate_dentry(direntry))
 767                         return 0;
 768                 else {
 769                         /*
 770                          * If the inode wasn't known to be a dfs entry when
 771                          * the dentry was instantiated, such as when created
 772                          * via ->readdir(), it needs to be set now since the
 773                          * attributes will have been updated by
 774                          * cifs_revalidate_dentry().
 775                          */
 776                         if (IS_AUTOMOUNT(direntry->d_inode) &&
 777                            !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
 778                                 spin_lock(&direntry->d_lock);
 779                                 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
 780                                 spin_unlock(&direntry->d_lock);
 781                         }
 782
 783                         return 1;
 784                 }
 785         }
 786
 787         /*
 788          * This may be nfsd (or something), anyway, we can't see the
 789          * intent of this. So, since this can be for creation, drop it.
 790          */
 791         if (!flags)
 792                 return 0;
 793
 794         /*
 795          * Drop the negative dentry, in order to make sure to use the
 796          * case sensitive name which is specified by user if this is
 797          * for creation.
 798          */
 799         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
 800                 return 0;
 801
 802         if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
 803                 return 0;
 804
 805         return 1;
 806 }
 807
 808 /* static int cifs_d_delete(struct dentry *direntry)
 809 {
 810         int rc = 0;
 811
 812         cifs_dbg(FYI, "In cifs d_delete, name = %s\n", direntry->d_name.name);
 813
 814         return rc;
 815 }     */
 816
 817 const struct dentry_operations cifs_dentry_ops = {
 818         .d_revalidate = cifs_d_revalidate,
 819         .d_automount = cifs_dfs_d_automount,
 820 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
 821 };
 822
 823 static int cifs_ci_hash(const struct dentry *dentry, const struct inode *inode,
 824                 struct qstr *q)
 825 {
 826         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
 827         unsigned long hash;
 828         int i;
 829
 830         hash = init_name_hash();
 831         for (i = 0; i < q->len; i++)
 832                 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
 833                                          hash);
 834         q->hash = end_name_hash(hash);
 835
 836         return 0;
 837 }
 838
 839 static int cifs_ci_compare(const struct dentry *parent,
 840                 const struct inode *pinode,
 841                 const struct dentry *dentry, const struct inode *inode,
 842                 unsigned int len, const char *str, const struct qstr *name)
 843 {
 844         struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;
 845
 846         if ((name->len == len) &&
 847             (nls_strnicmp(codepage, name->name, str, len) == 0))
 848                 return 0;
 849         return 1;
 850 }
 851
 852 const struct dentry_operations cifs_ci_dentry_ops = {
 853         .d_revalidate = cifs_d_revalidate,
 854         .d_hash = cifs_ci_hash,
 855         .d_compare = cifs_ci_compare,
 856         .d_automount = cifs_dfs_d_automount,
 857 };