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         struct cifs_open_parms oparms;
 208
 209         *oplock = 0;
 210         if (tcon->ses->server->oplocks)
 211                 *oplock = REQ_OPLOCK;
 212
 213         full_path = build_path_from_dentry(direntry);
 214         if (full_path == NULL) {
 215                 rc = -ENOMEM;
 216                 goto out;
 217         }
 218
 219         if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
 220             (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 221                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 222                 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
 223                                      oflags, oplock, &fid->netfid, xid);
 224                 switch (rc) {
 225                 case 0:
 226                         if (newinode == NULL) {
 227                                 /* query inode info */
 228                                 goto cifs_create_get_file_info;
 229                         }
 230
 231                         if (!S_ISREG(newinode->i_mode)) {
 232                                 /*
 233                                  * The server may allow us to open things like
 234                                  * FIFOs, but the client isn't set up to deal
 235                                  * with that. If it's not a regular file, just
 236                                  * close it and proceed as if it were a normal
 237                                  * lookup.
 238                                  */
 239                                 CIFSSMBClose(xid, tcon, fid->netfid);
 240                                 goto cifs_create_get_file_info;
 241                         }
 242                         /* success, no need to query */
 243                         goto cifs_create_set_dentry;
 244
 245                 case -ENOENT:
 246                         goto cifs_create_get_file_info;
 247
 248                 case -EIO:
 249                 case -EINVAL:
 250                         /*
 251                          * EIO could indicate that (posix open) operation is not
 252                          * supported, despite what server claimed in capability
 253                          * negotiation.
 254                          *
 255                          * POSIX open in samba versions 3.3.1 and earlier could
 256                          * incorrectly fail with invalid parameter.
 257                          */
 258                         tcon->broken_posix_open = true;
 259                         break;
 260
 261                 case -EREMOTE:
 262                 case -EOPNOTSUPP:
 263                         /*
 264                          * EREMOTE indicates DFS junction, which is not handled
 265                          * in posix open.  If either that or op not supported
 266                          * returned, follow the normal lookup.
 267                          */
 268                         break;
 269
 270                 default:
 271                         goto out;
 272                 }
 273                 /*
 274                  * fallthrough to retry, using older open call, this is case
 275                  * where server does not support this SMB level, and falsely
 276                  * claims capability (also get here for DFS case which should be
 277                  * rare for path not covered on files)
 278                  */
 279         }
 280
 281         desired_access = 0;
 282         if (OPEN_FMODE(oflags) & FMODE_READ)
 283                 desired_access |= GENERIC_READ; /* is this too little? */
 284         if (OPEN_FMODE(oflags) & FMODE_WRITE)
 285                 desired_access |= GENERIC_WRITE;
 286
 287         disposition = FILE_OVERWRITE_IF;
 288         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
 289                 disposition = FILE_CREATE;
 290         else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
 291                 disposition = FILE_OVERWRITE_IF;
 292         else if ((oflags & O_CREAT) == O_CREAT)
 293                 disposition = FILE_OPEN_IF;
 294         else
 295                 cifs_dbg(FYI, "Create flag not set in create function\n");
 296
 297         /*
 298          * BB add processing to set equivalent of mode - e.g. via CreateX with
 299          * ACLs
 300          */
 301
 302         if (!server->ops->open) {
 303                 rc = -ENOSYS;
 304                 goto out;
 305         }
 306
 307         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 308         if (buf == NULL) {
 309                 rc = -ENOMEM;
 310                 goto out;
 311         }
 312
 313         /*
 314          * if we're not using unix extensions, see if we need to set
 315          * ATTR_READONLY on the create call
 316          */
 317         if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
 318                 create_options |= CREATE_OPTION_READONLY;
 319
 320         if (backup_cred(cifs_sb))
 321                 create_options |= CREATE_OPEN_BACKUP_INTENT;
 322
 323         oparms.tcon = tcon;
 324         oparms.cifs_sb = cifs_sb;
 325         oparms.desired_access = desired_access;
 326         oparms.create_options = create_options;
 327         oparms.disposition = disposition;
 328         oparms.path = full_path;
 329         oparms.fid = fid;
 330
 331         rc = server->ops->open(xid, &oparms, oplock, buf);
 332         if (rc) {
 333                 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
 334                 goto out;
 335         }
 336
 337         /*
 338          * If Open reported that we actually created a file then we now have to
 339          * set the mode if possible.
 340          */
 341         if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
 342                 struct cifs_unix_set_info_args args = {
 343                                 .mode   = mode,
 344                                 .ctime  = NO_CHANGE_64,
 345                                 .atime  = NO_CHANGE_64,
 346                                 .mtime  = NO_CHANGE_64,
 347                                 .device = 0,
 348                 };
 349
 350                 *created |= FILE_CREATED;
 351                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 352                         args.uid = current_fsuid();
 353                         if (inode->i_mode & S_ISGID)
 354                                 args.gid = inode->i_gid;
 355                         else
 356                                 args.gid = current_fsgid();
 357                 } else {
 358                         args.uid = INVALID_UID; /* no change */
 359                         args.gid = INVALID_GID; /* no change */
 360                 }
 361                 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
 362                                        current->tgid);
 363         } else {
 364                 /*
 365                  * BB implement mode setting via Windows security
 366                  * descriptors e.g.
 367                  */
 368                 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
 369
 370                 /* Could set r/o dos attribute if mode & 0222 == 0 */
 371         }
 372
 373 cifs_create_get_file_info:
 374         /* server might mask mode so we have to query for it */
 375         if (tcon->unix_ext)
 376                 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
 377                                               xid);
 378         else {
 379                 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
 380                                          xid, &fid->netfid);
 381                 if (newinode) {
 382                         if (server->ops->set_lease_key)
 383                                 server->ops->set_lease_key(newinode, fid);
 384                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 385                                 newinode->i_mode = mode;
 386                         if ((*oplock & CIFS_CREATE_ACTION) &&
 387                             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
 388                                 newinode->i_uid = current_fsuid();
 389                                 if (inode->i_mode & S_ISGID)
 390                                         newinode->i_gid = inode->i_gid;
 391                                 else
 392                                         newinode->i_gid = current_fsgid();
 393                         }
 394                 }
 395         }
 396
 397 cifs_create_set_dentry:
 398         if (rc != 0) {
 399                 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
 400                          rc);
 401                 if (server->ops->close)
 402                         server->ops->close(xid, tcon, fid);
 403                 goto out;
 404         }
 405         d_drop(direntry);
 406         d_add(direntry, newinode);
 407
 408 out:
 409         kfree(buf);
 410         kfree(full_path);
 411         return rc;
 412 }
 413
 414 int
 415 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
 416                  struct file *file, unsigned oflags, umode_t mode,
 417                  int *opened)
 418 {
 419         int rc;
 420         unsigned int xid;
 421         struct tcon_link *tlink;
 422         struct cifs_tcon *tcon;
 423         struct TCP_Server_Info *server;
 424         struct cifs_fid fid;
 425         struct cifs_pending_open open;
 426         __u32 oplock;
 427         struct cifsFileInfo *file_info;
 428
 429         /*
 430          * Posix open is only called (at lookup time) for file create now. For
 431          * opens (rather than creates), because we do not know if it is a file
 432          * or directory yet, and current Samba no longer allows us to do posix
 433          * open on dirs, we could end up wasting an open call on what turns out
 434          * to be a dir. For file opens, we wait to call posix open till
 435          * cifs_open.  It could be added to atomic_open in the future but the
 436          * performance tradeoff of the extra network request when EISDIR or
 437          * EACCES is returned would have to be weighed against the 50% reduction
 438          * in network traffic in the other paths.
 439          */
 440         if (!(oflags & O_CREAT)) {
 441                 struct dentry *res;
 442
 443                 /*
 444                  * Check for hashed negative dentry. We have already revalidated
 445                  * the dentry and it is fine. No need to perform another lookup.
 446                  */
 447                 if (!d_unhashed(direntry))
 448                         return -ENOENT;
 449
 450                 res = cifs_lookup(inode, direntry, 0);
 451                 if (IS_ERR(res))
 452                         return PTR_ERR(res);
 453
 454                 return finish_no_open(file, res);
 455         }
 456
 457         rc = check_name(direntry);
 458         if (rc)
 459                 return rc;
 460
 461         xid = get_xid();
 462
 463         cifs_dbg(FYI, "parent inode = 0x%p name is: %s and dentry = 0x%p\n",
 464                  inode, direntry->d_name.name, direntry);
 465
 466         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
 467         if (IS_ERR(tlink)) {
 468                 rc = PTR_ERR(tlink);
 469                 goto out_free_xid;
 470         }
 471
 472         tcon = tlink_tcon(tlink);
 473         server = tcon->ses->server;
 474
 475         if (server->ops->new_lease_key)
 476                 server->ops->new_lease_key(&fid);
 477
 478         cifs_add_pending_open(&fid, tlink, &open);
 479
 480         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
 481                             &oplock, &fid, opened);
 482
 483         if (rc) {
 484                 cifs_del_pending_open(&open);
 485                 goto out;
 486         }
 487
 488         rc = finish_open(file, direntry, generic_file_open, opened);
 489         if (rc) {
 490                 if (server->ops->close)
 491                         server->ops->close(xid, tcon, &fid);
 492                 cifs_del_pending_open(&open);
 493                 goto out;
 494         }
 495
 496         file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
 497         if (file_info == NULL) {
 498                 if (server->ops->close)
 499                         server->ops->close(xid, tcon, &fid);
 500                 cifs_del_pending_open(&open);
 501                 rc = -ENOMEM;
 502         }
 503
 504 out:
 505         cifs_put_tlink(tlink);
 506 out_free_xid:
 507         free_xid(xid);
 508         return rc;
 509 }
 510
 511 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
 512                 bool excl)
 513 {
 514         int rc;
 515         unsigned int xid = get_xid();
 516         /*
 517          * BB below access is probably too much for mknod to request
 518          *    but we have to do query and setpathinfo so requesting
 519          *    less could fail (unless we want to request getatr and setatr
 520          *    permissions (only).  At least for POSIX we do not have to
 521          *    request so much.
 522          */
 523         unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
 524         struct tcon_link *tlink;
 525         struct cifs_tcon *tcon;
 526         struct TCP_Server_Info *server;
 527         struct cifs_fid fid;
 528         __u32 oplock;
 529         int created = FILE_CREATED;
 530
 531         cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %s and dentry = 0x%p\n",
 532                  inode, direntry->d_name.name, direntry);
 533
 534         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
 535         rc = PTR_ERR(tlink);
 536         if (IS_ERR(tlink))
 537                 goto out_free_xid;
 538
 539         tcon = tlink_tcon(tlink);
 540         server = tcon->ses->server;
 541
 542         if (server->ops->new_lease_key)
 543                 server->ops->new_lease_key(&fid);
 544
 545         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
 546                             &oplock, &fid, &created);
 547         if (!rc && server->ops->close)
 548                 server->ops->close(xid, tcon, &fid);
 549
 550         cifs_put_tlink(tlink);
 551 out_free_xid:
 552         free_xid(xid);
 553         return rc;
 554 }
 555
 556 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
 557                 dev_t device_number)
 558 {
 559         int rc = -EPERM;
 560         unsigned int xid;
 561         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
 562         struct cifs_sb_info *cifs_sb;
 563         struct tcon_link *tlink;
 564         struct cifs_tcon *pTcon;
 565         struct cifs_io_parms io_parms;
 566         char *full_path = NULL;
 567         struct inode *newinode = NULL;
 568         int oplock = 0;
 569         u16 fileHandle;
 570         FILE_ALL_INFO *buf = NULL;
 571         unsigned int bytes_written;
 572         struct win_dev *pdev;
 573
 574         if (!old_valid_dev(device_number))
 575                 return -EINVAL;
 576
 577         cifs_sb = CIFS_SB(inode->i_sb);
 578         tlink = cifs_sb_tlink(cifs_sb);
 579         if (IS_ERR(tlink))
 580                 return PTR_ERR(tlink);
 581
 582         pTcon = tlink_tcon(tlink);
 583
 584         xid = get_xid();
 585
 586         full_path = build_path_from_dentry(direntry);
 587         if (full_path == NULL) {
 588                 rc = -ENOMEM;
 589                 goto mknod_out;
 590         }
 591
 592         if (pTcon->unix_ext) {
 593                 struct cifs_unix_set_info_args args = {
 594                         .mode   = mode & ~current_umask(),
 595                         .ctime  = NO_CHANGE_64,
 596                         .atime  = NO_CHANGE_64,
 597                         .mtime  = NO_CHANGE_64,
 598                         .device = device_number,
 599                 };
 600                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 601                         args.uid = current_fsuid();
 602                         args.gid = current_fsgid();
 603                 } else {
 604                         args.uid = INVALID_UID; /* no change */
 605                         args.gid = INVALID_GID; /* no change */
 606                 }
 607                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
 608                                             cifs_sb->local_nls,
 609                                             cifs_sb->mnt_cifs_flags &
 610                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 611                 if (rc)
 612                         goto mknod_out;
 613
 614                 rc = cifs_get_inode_info_unix(&newinode, full_path,
 615                                                 inode->i_sb, xid);
 616
 617                 if (rc == 0)
 618                         d_instantiate(direntry, newinode);
 619                 goto mknod_out;
 620         }
 621
 622         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
 623                 goto mknod_out;
 624
 625
 626         cifs_dbg(FYI, "sfu compat create special file\n");
 627
 628         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 629         if (buf == NULL) {
 630                 kfree(full_path);
 631                 rc = -ENOMEM;
 632                 free_xid(xid);
 633                 return rc;
 634         }
 635
 636         if (backup_cred(cifs_sb))
 637                 create_options |= CREATE_OPEN_BACKUP_INTENT;
 638
 639         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
 640                          GENERIC_WRITE, create_options,
 641                          &fileHandle, &oplock, buf, cifs_sb->local_nls,
 642                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 643         if (rc)
 644                 goto mknod_out;
 645
 646         /* BB Do not bother to decode buf since no local inode yet to put
 647          * timestamps in, but we can reuse it safely */
 648
 649         pdev = (struct win_dev *)buf;
 650         io_parms.netfid = fileHandle;
 651         io_parms.pid = current->tgid;
 652         io_parms.tcon = pTcon;
 653         io_parms.offset = 0;
 654         io_parms.length = sizeof(struct win_dev);
 655         if (S_ISCHR(mode)) {
 656                 memcpy(pdev->type, "IntxCHR", 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_ISBLK(mode)) {
 665                 memcpy(pdev->type, "IntxBLK", 8);
 666                 pdev->major =
 667                       cpu_to_le64(MAJOR(device_number));
 668                 pdev->minor =
 669                       cpu_to_le64(MINOR(device_number));
 670                 rc = CIFSSMBWrite(xid, &io_parms,
 671                         &bytes_written, (char *)pdev,
 672                         NULL, 0);
 673         } /* else if (S_ISFIFO) */
 674         CIFSSMBClose(xid, pTcon, fileHandle);
 675         d_drop(direntry);
 676
 677         /* FIXME: add code here to set EAs */
 678
 679 mknod_out:
 680         kfree(full_path);
 681         kfree(buf);
 682         free_xid(xid);
 683         cifs_put_tlink(tlink);
 684         return rc;
 685 }
 686
 687 struct dentry *
 688 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 689             unsigned int flags)
 690 {
 691         unsigned int xid;
 692         int rc = 0; /* to get around spurious gcc warning, set to zero here */
 693         struct cifs_sb_info *cifs_sb;
 694         struct tcon_link *tlink;
 695         struct cifs_tcon *pTcon;
 696         struct inode *newInode = NULL;
 697         char *full_path = NULL;
 698
 699         xid = get_xid();
 700
 701         cifs_dbg(FYI, "parent inode = 0x%p name is: %s and dentry = 0x%p\n",
 702                  parent_dir_inode, direntry->d_name.name, direntry);
 703
 704         /* check whether path exists */
 705
 706         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
 707         tlink = cifs_sb_tlink(cifs_sb);
 708         if (IS_ERR(tlink)) {
 709                 free_xid(xid);
 710                 return (struct dentry *)tlink;
 711         }
 712         pTcon = tlink_tcon(tlink);
 713
 714         rc = check_name(direntry);
 715         if (rc)
 716                 goto lookup_out;
 717
 718         /* can not grab the rename sem here since it would
 719         deadlock in the cases (beginning of sys_rename itself)
 720         in which we already have the sb rename sem */
 721         full_path = build_path_from_dentry(direntry);
 722         if (full_path == NULL) {
 723                 rc = -ENOMEM;
 724                 goto lookup_out;
 725         }
 726
 727         if (direntry->d_inode != NULL) {
 728                 cifs_dbg(FYI, "non-NULL inode in lookup\n");
 729         } else {
 730                 cifs_dbg(FYI, "NULL inode in lookup\n");
 731         }
 732         cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
 733                  full_path, direntry->d_inode);
 734
 735         if (pTcon->unix_ext) {
 736                 rc = cifs_get_inode_info_unix(&newInode, full_path,
 737                                               parent_dir_inode->i_sb, xid);
 738         } else {
 739                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
 740                                 parent_dir_inode->i_sb, xid, NULL);
 741         }
 742
 743         if ((rc == 0) && (newInode != NULL)) {
 744                 d_add(direntry, newInode);
 745                 /* since paths are not looked up by component - the parent
 746                    directories are presumed to be good here */
 747                 renew_parental_timestamps(direntry);
 748
 749         } else if (rc == -ENOENT) {
 750                 rc = 0;
 751                 direntry->d_time = jiffies;
 752                 d_add(direntry, NULL);
 753         /*      if it was once a directory (but how can we tell?) we could do
 754                 shrink_dcache_parent(direntry); */
 755         } else if (rc != -EACCES) {
 756                 cifs_dbg(VFS, "Unexpected lookup error %d\n", rc);
 757                 /* We special case check for Access Denied - since that
 758                 is a common return code */
 759         }
 760
 761 lookup_out:
 762         kfree(full_path);
 763         cifs_put_tlink(tlink);
 764         free_xid(xid);
 765         return ERR_PTR(rc);
 766 }
 767
 768 static int
 769 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
 770 {
 771         if (flags & LOOKUP_RCU)
 772                 return -ECHILD;
 773
 774         if (direntry->d_inode) {
 775                 if (cifs_revalidate_dentry(direntry))
 776                         return 0;
 777                 else {
 778                         /*
 779                          * If the inode wasn't known to be a dfs entry when
 780                          * the dentry was instantiated, such as when created
 781                          * via ->readdir(), it needs to be set now since the
 782                          * attributes will have been updated by
 783                          * cifs_revalidate_dentry().
 784                          */
 785                         if (IS_AUTOMOUNT(direntry->d_inode) &&
 786                            !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
 787                                 spin_lock(&direntry->d_lock);
 788                                 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
 789                                 spin_unlock(&direntry->d_lock);
 790                         }
 791
 792                         return 1;
 793                 }
 794         }
 795
 796         /*
 797          * This may be nfsd (or something), anyway, we can't see the
 798          * intent of this. So, since this can be for creation, drop it.
 799          */
 800         if (!flags)
 801                 return 0;
 802
 803         /*
 804          * Drop the negative dentry, in order to make sure to use the
 805          * case sensitive name which is specified by user if this is
 806          * for creation.
 807          */
 808         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
 809                 return 0;
 810
 811         if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
 812                 return 0;
 813
 814         return 1;
 815 }
 816
 817 /* static int cifs_d_delete(struct dentry *direntry)
 818 {
 819         int rc = 0;
 820
 821         cifs_dbg(FYI, "In cifs d_delete, name = %s\n", direntry->d_name.name);
 822
 823         return rc;
 824 }     */
 825
 826 const struct dentry_operations cifs_dentry_ops = {
 827         .d_revalidate = cifs_d_revalidate,
 828         .d_automount = cifs_dfs_d_automount,
 829 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
 830 };
 831
 832 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
 833 {
 834         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
 835         unsigned long hash;
 836         int i;
 837
 838         hash = init_name_hash();
 839         for (i = 0; i < q->len; i++)
 840                 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
 841                                          hash);
 842         q->hash = end_name_hash(hash);
 843
 844         return 0;
 845 }
 846
 847 static int cifs_ci_compare(const struct dentry *parent, const struct dentry *dentry,
 848                 unsigned int len, const char *str, const struct qstr *name)
 849 {
 850         struct nls_table *codepage = CIFS_SB(parent->d_sb)->local_nls;
 851
 852         if ((name->len == len) &&
 853             (nls_strnicmp(codepage, name->name, str, len) == 0))
 854                 return 0;
 855         return 1;
 856 }
 857
 858 const struct dentry_operations cifs_ci_dentry_ops = {
 859         .d_revalidate = cifs_d_revalidate,
 860         .d_hash = cifs_ci_hash,
 861         .d_compare = cifs_ci_compare,
 862         .d_automount = cifs_dfs_d_automount,
 863 };