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 #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                 direntry->d_time = 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)
  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 (tcon->Flags & SMB_SHARE_IS_IN_DFS)
  63                 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
  64         else
  65                 dfsplen = 0;
  66
  67         full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
  68         if (full_path == NULL)
  69                 return full_path;
  70
  71         if (dfsplen)
  72                 strncpy(full_path, tcon->treeName, dfsplen);
  73         full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
  74         strncpy(full_path + dfsplen + 1, vol->prepath, pplen);
  75         convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
  76         full_path[dfsplen + pplen] = 0; /* add trailing null */
  77         return full_path;
  78 }
  79
  80 /* Note: caller must free return buffer */
  81 char *
  82 build_path_from_dentry(struct dentry *direntry)
  83 {
  84         struct dentry *temp;
  85         int namelen;
  86         int dfsplen;
  87         char *full_path;
  88         char dirsep;
  89         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
  90         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
  91         unsigned seq;
  92
  93         dirsep = CIFS_DIR_SEP(cifs_sb);
  94         if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
  95                 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
  96         else
  97                 dfsplen = 0;
  98 cifs_bp_rename_retry:
  99         namelen = dfsplen;
 100         seq = read_seqbegin(&rename_lock);
 101         rcu_read_lock();
 102         for (temp = direntry; !IS_ROOT(temp);) {
 103                 namelen += (1 + temp->d_name.len);
 104                 temp = temp->d_parent;
 105                 if (temp == NULL) {
 106                         cifs_dbg(VFS, "corrupt dentry\n");
 107                         rcu_read_unlock();
 108                         return NULL;
 109                 }
 110         }
 111         rcu_read_unlock();
 112
 113         full_path = kmalloc(namelen+1, GFP_KERNEL);
 114         if (full_path == NULL)
 115                 return full_path;
 116         full_path[namelen] = 0; /* trailing null */
 117         rcu_read_lock();
 118         for (temp = direntry; !IS_ROOT(temp);) {
 119                 spin_lock(&temp->d_lock);
 120                 namelen -= 1 + temp->d_name.len;
 121                 if (namelen < 0) {
 122                         spin_unlock(&temp->d_lock);
 123                         break;
 124                 } else {
 125                         full_path[namelen] = dirsep;
 126                         strncpy(full_path + namelen + 1, temp->d_name.name,
 127                                 temp->d_name.len);
 128                         cifs_dbg(FYI, "name: %s\n", full_path + namelen);
 129                 }
 130                 spin_unlock(&temp->d_lock);
 131                 temp = temp->d_parent;
 132                 if (temp == NULL) {
 133                         cifs_dbg(VFS, "corrupt dentry\n");
 134                         rcu_read_unlock();
 135                         kfree(full_path);
 136                         return NULL;
 137                 }
 138         }
 139         rcu_read_unlock();
 140         if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
 141                 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
 142                          namelen, dfsplen);
 143                 /* presumably this is only possible if racing with a rename
 144                 of one of the parent directories  (we can not lock the dentries
 145                 above us to prevent this, but retrying should be harmless) */
 146                 kfree(full_path);
 147                 goto cifs_bp_rename_retry;
 148         }
 149         /* DIR_SEP already set for byte  0 / vs \ but not for
 150            subsequent slashes in prepath which currently must
 151            be entered the right way - not sure if there is an alternative
 152            since the '\' is a valid posix character so we can not switch
 153            those safely to '/' if any are found in the middle of the prepath */
 154         /* BB test paths to Windows with '/' in the midst of prepath */
 155
 156         if (dfsplen) {
 157                 strncpy(full_path, tcon->treeName, dfsplen);
 158                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
 159                         int i;
 160                         for (i = 0; i < dfsplen; i++) {
 161                                 if (full_path[i] == '\\')
 162                                         full_path[i] = '/';
 163                         }
 164                 }
 165         }
 166         return full_path;
 167 }
 168
 169 /*
 170  * Don't allow the separator character in a path component.
 171  * The VFS will not allow "/", but "\" is allowed by posix.
 172  */
 173 static int
 174 check_name(struct dentry *direntry)
 175 {
 176         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
 177         int i;
 178
 179         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
 180                 for (i = 0; i < direntry->d_name.len; i++) {
 181                         if (direntry->d_name.name[i] == '\\') {
 182                                 cifs_dbg(FYI, "Invalid file name\n");
 183                                 return -EINVAL;
 184                         }
 185                 }
 186         }
 187         return 0;
 188 }
 189
 190
 191 /* Inode operations in similar order to how they appear in Linux file fs.h */
 192
 193 static int
 194 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
 195                struct tcon_link *tlink, unsigned oflags, umode_t mode,
 196                __u32 *oplock, struct cifs_fid *fid)
 197 {
 198         int rc = -ENOENT;
 199         int create_options = CREATE_NOT_DIR;
 200         int desired_access;
 201         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 202         struct cifs_tcon *tcon = tlink_tcon(tlink);
 203         char *full_path = NULL;
 204         FILE_ALL_INFO *buf = NULL;
 205         struct inode *newinode = NULL;
 206         int disposition;
 207         struct TCP_Server_Info *server = tcon->ses->server;
 208         struct cifs_open_parms oparms;
 209
 210         *oplock = 0;
 211         if (tcon->ses->server->oplocks)
 212                 *oplock = REQ_OPLOCK;
 213
 214         full_path = build_path_from_dentry(direntry);
 215         if (full_path == NULL) {
 216                 rc = -ENOMEM;
 217                 goto out;
 218         }
 219
 220         if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
 221             (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 222                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 223                 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
 224                                      oflags, oplock, &fid->netfid, xid);
 225                 switch (rc) {
 226                 case 0:
 227                         if (newinode == NULL) {
 228                                 /* query inode info */
 229                                 goto cifs_create_get_file_info;
 230                         }
 231
 232                         if (!S_ISREG(newinode->i_mode)) {
 233                                 /*
 234                                  * The server may allow us to open things like
 235                                  * FIFOs, but the client isn't set up to deal
 236                                  * with that. If it's not a regular file, just
 237                                  * close it and proceed as if it were a normal
 238                                  * lookup.
 239                                  */
 240                                 CIFSSMBClose(xid, tcon, fid->netfid);
 241                                 goto cifs_create_get_file_info;
 242                         }
 243                         /* success, no need to query */
 244                         goto cifs_create_set_dentry;
 245
 246                 case -ENOENT:
 247                         goto cifs_create_get_file_info;
 248
 249                 case -EIO:
 250                 case -EINVAL:
 251                         /*
 252                          * EIO could indicate that (posix open) operation is not
 253                          * supported, despite what server claimed in capability
 254                          * negotiation.
 255                          *
 256                          * POSIX open in samba versions 3.3.1 and earlier could
 257                          * incorrectly fail with invalid parameter.
 258                          */
 259                         tcon->broken_posix_open = true;
 260                         break;
 261
 262                 case -EREMOTE:
 263                 case -EOPNOTSUPP:
 264                         /*
 265                          * EREMOTE indicates DFS junction, which is not handled
 266                          * in posix open.  If either that or op not supported
 267                          * returned, follow the normal lookup.
 268                          */
 269                         break;
 270
 271                 default:
 272                         goto out;
 273                 }
 274                 /*
 275                  * fallthrough to retry, using older open call, this is case
 276                  * where server does not support this SMB level, and falsely
 277                  * claims capability (also get here for DFS case which should be
 278                  * rare for path not covered on files)
 279                  */
 280         }
 281
 282         desired_access = 0;
 283         if (OPEN_FMODE(oflags) & FMODE_READ)
 284                 desired_access |= GENERIC_READ; /* is this too little? */
 285         if (OPEN_FMODE(oflags) & FMODE_WRITE)
 286                 desired_access |= GENERIC_WRITE;
 287
 288         disposition = FILE_OVERWRITE_IF;
 289         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
 290                 disposition = FILE_CREATE;
 291         else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
 292                 disposition = FILE_OVERWRITE_IF;
 293         else if ((oflags & O_CREAT) == O_CREAT)
 294                 disposition = FILE_OPEN_IF;
 295         else
 296                 cifs_dbg(FYI, "Create flag not set in create function\n");
 297
 298         /*
 299          * BB add processing to set equivalent of mode - e.g. via CreateX with
 300          * ACLs
 301          */
 302
 303         if (!server->ops->open) {
 304                 rc = -ENOSYS;
 305                 goto out;
 306         }
 307
 308         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 309         if (buf == NULL) {
 310                 rc = -ENOMEM;
 311                 goto out;
 312         }
 313
 314         /*
 315          * if we're not using unix extensions, see if we need to set
 316          * ATTR_READONLY on the create call
 317          */
 318         if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
 319                 create_options |= CREATE_OPTION_READONLY;
 320
 321         if (backup_cred(cifs_sb))
 322                 create_options |= CREATE_OPEN_BACKUP_INTENT;
 323
 324         oparms.tcon = tcon;
 325         oparms.cifs_sb = cifs_sb;
 326         oparms.desired_access = desired_access;
 327         oparms.create_options = create_options;
 328         oparms.disposition = disposition;
 329         oparms.path = full_path;
 330         oparms.fid = fid;
 331         oparms.reconnect = false;
 332
 333         rc = server->ops->open(xid, &oparms, oplock, buf);
 334         if (rc) {
 335                 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
 336                 goto out;
 337         }
 338
 339         /*
 340          * If Open reported that we actually created a file then we now have to
 341          * set the mode if possible.
 342          */
 343         if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
 344                 struct cifs_unix_set_info_args args = {
 345                                 .mode   = mode,
 346                                 .ctime  = NO_CHANGE_64,
 347                                 .atime  = NO_CHANGE_64,
 348                                 .mtime  = NO_CHANGE_64,
 349                                 .device = 0,
 350                 };
 351
 352                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 353                         args.uid = current_fsuid();
 354                         if (inode->i_mode & S_ISGID)
 355                                 args.gid = inode->i_gid;
 356                         else
 357                                 args.gid = current_fsgid();
 358                 } else {
 359                         args.uid = INVALID_UID; /* no change */
 360                         args.gid = INVALID_GID; /* no change */
 361                 }
 362                 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
 363                                        current->tgid);
 364         } else {
 365                 /*
 366                  * BB implement mode setting via Windows security
 367                  * descriptors e.g.
 368                  */
 369                 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
 370
 371                 /* Could set r/o dos attribute if mode & 0222 == 0 */
 372         }
 373
 374 cifs_create_get_file_info:
 375         /* server might mask mode so we have to query for it */
 376         if (tcon->unix_ext)
 377                 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
 378                                               xid);
 379         else {
 380                 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
 381                                          xid, fid);
 382                 if (newinode) {
 383                         if (server->ops->set_lease_key)
 384                                 server->ops->set_lease_key(newinode, fid);
 385                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 386                                 newinode->i_mode = mode;
 387                         if ((*oplock & CIFS_CREATE_ACTION) &&
 388                             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
 389                                 newinode->i_uid = current_fsuid();
 390                                 if (inode->i_mode & S_ISGID)
 391                                         newinode->i_gid = inode->i_gid;
 392                                 else
 393                                         newinode->i_gid = current_fsgid();
 394                         }
 395                 }
 396         }
 397
 398 cifs_create_set_dentry:
 399         if (rc != 0) {
 400                 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
 401                          rc);
 402                 if (server->ops->close)
 403                         server->ops->close(xid, tcon, fid);
 404                 goto out;
 405         }
 406         d_drop(direntry);
 407         d_add(direntry, newinode);
 408
 409 out:
 410         kfree(buf);
 411         kfree(full_path);
 412         return rc;
 413 }
 414
 415 int
 416 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
 417                  struct file *file, unsigned oflags, umode_t mode,
 418                  int *opened)
 419 {
 420         int rc;
 421         unsigned int xid;
 422         struct tcon_link *tlink;
 423         struct cifs_tcon *tcon;
 424         struct TCP_Server_Info *server;
 425         struct cifs_fid fid;
 426         struct cifs_pending_open open;
 427         __u32 oplock;
 428         struct cifsFileInfo *file_info;
 429
 430         /*
 431          * Posix open is only called (at lookup time) for file create now. For
 432          * opens (rather than creates), because we do not know if it is a file
 433          * or directory yet, and current Samba no longer allows us to do posix
 434          * open on dirs, we could end up wasting an open call on what turns out
 435          * to be a dir. For file opens, we wait to call posix open till
 436          * cifs_open.  It could be added to atomic_open in the future but the
 437          * performance tradeoff of the extra network request when EISDIR or
 438          * EACCES is returned would have to be weighed against the 50% reduction
 439          * in network traffic in the other paths.
 440          */
 441         if (!(oflags & O_CREAT)) {
 442                 struct dentry *res;
 443
 444                 /*
 445                  * Check for hashed negative dentry. We have already revalidated
 446                  * the dentry and it is fine. No need to perform another lookup.
 447                  */
 448                 if (!d_unhashed(direntry))
 449                         return -ENOENT;
 450
 451                 res = cifs_lookup(inode, direntry, 0);
 452                 if (IS_ERR(res))
 453                         return PTR_ERR(res);
 454
 455                 return finish_no_open(file, res);
 456         }
 457
 458         rc = check_name(direntry);
 459         if (rc)
 460                 return rc;
 461
 462         xid = get_xid();
 463
 464         cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
 465                  inode, direntry, direntry);
 466
 467         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
 468         if (IS_ERR(tlink)) {
 469                 rc = PTR_ERR(tlink);
 470                 goto out_free_xid;
 471         }
 472
 473         tcon = tlink_tcon(tlink);
 474         server = tcon->ses->server;
 475
 476         if (server->ops->new_lease_key)
 477                 server->ops->new_lease_key(&fid);
 478
 479         cifs_add_pending_open(&fid, tlink, &open);
 480
 481         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
 482                             &oplock, &fid);
 483
 484         if (rc) {
 485                 cifs_del_pending_open(&open);
 486                 goto out;
 487         }
 488
 489         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
 490                 *opened |= FILE_CREATED;
 491
 492         rc = finish_open(file, direntry, generic_file_open, opened);
 493         if (rc) {
 494                 if (server->ops->close)
 495                         server->ops->close(xid, tcon, &fid);
 496                 cifs_del_pending_open(&open);
 497                 goto out;
 498         }
 499
 500         if (file->f_flags & O_DIRECT &&
 501             CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
 502                 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 503                         file->f_op = &cifs_file_direct_nobrl_ops;
 504                 else
 505                         file->f_op = &cifs_file_direct_ops;
 506                 }
 507
 508         file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
 509         if (file_info == NULL) {
 510                 if (server->ops->close)
 511                         server->ops->close(xid, tcon, &fid);
 512                 cifs_del_pending_open(&open);
 513                 fput(file);
 514                 rc = -ENOMEM;
 515         }
 516
 517 out:
 518         cifs_put_tlink(tlink);
 519 out_free_xid:
 520         free_xid(xid);
 521         return rc;
 522 }
 523
 524 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
 525                 bool excl)
 526 {
 527         int rc;
 528         unsigned int xid = get_xid();
 529         /*
 530          * BB below access is probably too much for mknod to request
 531          *    but we have to do query and setpathinfo so requesting
 532          *    less could fail (unless we want to request getatr and setatr
 533          *    permissions (only).  At least for POSIX we do not have to
 534          *    request so much.
 535          */
 536         unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
 537         struct tcon_link *tlink;
 538         struct cifs_tcon *tcon;
 539         struct TCP_Server_Info *server;
 540         struct cifs_fid fid;
 541         __u32 oplock;
 542
 543         cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
 544                  inode, direntry, direntry);
 545
 546         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
 547         rc = PTR_ERR(tlink);
 548         if (IS_ERR(tlink))
 549                 goto out_free_xid;
 550
 551         tcon = tlink_tcon(tlink);
 552         server = tcon->ses->server;
 553
 554         if (server->ops->new_lease_key)
 555                 server->ops->new_lease_key(&fid);
 556
 557         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
 558                             &oplock, &fid);
 559         if (!rc && server->ops->close)
 560                 server->ops->close(xid, tcon, &fid);
 561
 562         cifs_put_tlink(tlink);
 563 out_free_xid:
 564         free_xid(xid);
 565         return rc;
 566 }
 567
 568 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
 569                 dev_t device_number)
 570 {
 571         int rc = -EPERM;
 572         unsigned int xid;
 573         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
 574         struct cifs_sb_info *cifs_sb;
 575         struct tcon_link *tlink;
 576         struct cifs_tcon *tcon;
 577         struct cifs_io_parms io_parms;
 578         char *full_path = NULL;
 579         struct inode *newinode = NULL;
 580         __u32 oplock = 0;
 581         struct cifs_fid fid;
 582         struct cifs_open_parms oparms;
 583         FILE_ALL_INFO *buf = NULL;
 584         unsigned int bytes_written;
 585         struct win_dev *pdev;
 586         struct kvec iov[2];
 587
 588         if (!old_valid_dev(device_number))
 589                 return -EINVAL;
 590
 591         cifs_sb = CIFS_SB(inode->i_sb);
 592         tlink = cifs_sb_tlink(cifs_sb);
 593         if (IS_ERR(tlink))
 594                 return PTR_ERR(tlink);
 595
 596         tcon = tlink_tcon(tlink);
 597
 598         xid = get_xid();
 599
 600         full_path = build_path_from_dentry(direntry);
 601         if (full_path == NULL) {
 602                 rc = -ENOMEM;
 603                 goto mknod_out;
 604         }
 605
 606         if (tcon->unix_ext) {
 607                 struct cifs_unix_set_info_args args = {
 608                         .mode   = mode & ~current_umask(),
 609                         .ctime  = NO_CHANGE_64,
 610                         .atime  = NO_CHANGE_64,
 611                         .mtime  = NO_CHANGE_64,
 612                         .device = device_number,
 613                 };
 614                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 615                         args.uid = current_fsuid();
 616                         args.gid = current_fsgid();
 617                 } else {
 618                         args.uid = INVALID_UID; /* no change */
 619                         args.gid = INVALID_GID; /* no change */
 620                 }
 621                 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
 622                                             cifs_sb->local_nls,
 623                                             cifs_sb->mnt_cifs_flags &
 624                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 625                 if (rc)
 626                         goto mknod_out;
 627
 628                 rc = cifs_get_inode_info_unix(&newinode, full_path,
 629                                                 inode->i_sb, xid);
 630
 631                 if (rc == 0)
 632                         d_instantiate(direntry, newinode);
 633                 goto mknod_out;
 634         }
 635
 636         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
 637                 goto mknod_out;
 638
 639
 640         cifs_dbg(FYI, "sfu compat create special file\n");
 641
 642         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 643         if (buf == NULL) {
 644                 kfree(full_path);
 645                 rc = -ENOMEM;
 646                 free_xid(xid);
 647                 return rc;
 648         }
 649
 650         if (backup_cred(cifs_sb))
 651                 create_options |= CREATE_OPEN_BACKUP_INTENT;
 652
 653         oparms.tcon = tcon;
 654         oparms.cifs_sb = cifs_sb;
 655         oparms.desired_access = GENERIC_WRITE;
 656         oparms.create_options = create_options;
 657         oparms.disposition = FILE_CREATE;
 658         oparms.path = full_path;
 659         oparms.fid = &fid;
 660         oparms.reconnect = false;
 661
 662         if (tcon->ses->server->oplocks)
 663                 oplock = REQ_OPLOCK;
 664         else
 665                 oplock = 0;
 666         rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
 667         if (rc)
 668                 goto mknod_out;
 669
 670         /*
 671          * BB Do not bother to decode buf since no local inode yet to put
 672          * timestamps in, but we can reuse it safely.
 673          */
 674
 675         pdev = (struct win_dev *)buf;
 676         io_parms.pid = current->tgid;
 677         io_parms.tcon = tcon;
 678         io_parms.offset = 0;
 679         io_parms.length = sizeof(struct win_dev);
 680         iov[1].iov_base = buf;
 681         iov[1].iov_len = sizeof(struct win_dev);
 682         if (S_ISCHR(mode)) {
 683                 memcpy(pdev->type, "IntxCHR", 8);
 684                 pdev->major = cpu_to_le64(MAJOR(device_number));
 685                 pdev->minor = cpu_to_le64(MINOR(device_number));
 686                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
 687                                                         &bytes_written, iov, 1);
 688         } else if (S_ISBLK(mode)) {
 689                 memcpy(pdev->type, "IntxBLK", 8);
 690                 pdev->major = cpu_to_le64(MAJOR(device_number));
 691                 pdev->minor = cpu_to_le64(MINOR(device_number));
 692                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
 693                                                         &bytes_written, iov, 1);
 694         } /* else if (S_ISFIFO) */
 695         tcon->ses->server->ops->close(xid, tcon, &fid);
 696         d_drop(direntry);
 697
 698         /* FIXME: add code here to set EAs */
 699
 700 mknod_out:
 701         kfree(full_path);
 702         kfree(buf);
 703         free_xid(xid);
 704         cifs_put_tlink(tlink);
 705         return rc;
 706 }
 707
 708 struct dentry *
 709 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 710             unsigned int flags)
 711 {
 712         unsigned int xid;
 713         int rc = 0; /* to get around spurious gcc warning, set to zero here */
 714         struct cifs_sb_info *cifs_sb;
 715         struct tcon_link *tlink;
 716         struct cifs_tcon *pTcon;
 717         struct inode *newInode = NULL;
 718         char *full_path = NULL;
 719
 720         xid = get_xid();
 721
 722         cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
 723                  parent_dir_inode, direntry, direntry);
 724
 725         /* check whether path exists */
 726
 727         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
 728         tlink = cifs_sb_tlink(cifs_sb);
 729         if (IS_ERR(tlink)) {
 730                 free_xid(xid);
 731                 return (struct dentry *)tlink;
 732         }
 733         pTcon = tlink_tcon(tlink);
 734
 735         rc = check_name(direntry);
 736         if (rc)
 737                 goto lookup_out;
 738
 739         /* can not grab the rename sem here since it would
 740         deadlock in the cases (beginning of sys_rename itself)
 741         in which we already have the sb rename sem */
 742         full_path = build_path_from_dentry(direntry);
 743         if (full_path == NULL) {
 744                 rc = -ENOMEM;
 745                 goto lookup_out;
 746         }
 747
 748         if (d_really_is_positive(direntry)) {
 749                 cifs_dbg(FYI, "non-NULL inode in lookup\n");
 750         } else {
 751                 cifs_dbg(FYI, "NULL inode in lookup\n");
 752         }
 753         cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
 754                  full_path, d_inode(direntry));
 755
 756         if (pTcon->unix_ext) {
 757                 rc = cifs_get_inode_info_unix(&newInode, full_path,
 758                                               parent_dir_inode->i_sb, xid);
 759         } else {
 760                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
 761                                 parent_dir_inode->i_sb, xid, NULL);
 762         }
 763
 764         if ((rc == 0) && (newInode != NULL)) {
 765                 d_add(direntry, newInode);
 766                 /* since paths are not looked up by component - the parent
 767                    directories are presumed to be good here */
 768                 renew_parental_timestamps(direntry);
 769
 770         } else if (rc == -ENOENT) {
 771                 rc = 0;
 772                 direntry->d_time = jiffies;
 773                 d_add(direntry, NULL);
 774         /*      if it was once a directory (but how can we tell?) we could do
 775                 shrink_dcache_parent(direntry); */
 776         } else if (rc != -EACCES) {
 777                 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
 778                 /* We special case check for Access Denied - since that
 779                 is a common return code */
 780         }
 781
 782 lookup_out:
 783         kfree(full_path);
 784         cifs_put_tlink(tlink);
 785         free_xid(xid);
 786         return ERR_PTR(rc);
 787 }
 788
 789 static int
 790 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
 791 {
 792         if (flags & LOOKUP_RCU)
 793                 return -ECHILD;
 794
 795         if (d_really_is_positive(direntry)) {
 796                 if (cifs_revalidate_dentry(direntry))
 797                         return 0;
 798                 else {
 799                         /*
 800                          * If the inode wasn't known to be a dfs entry when
 801                          * the dentry was instantiated, such as when created
 802                          * via ->readdir(), it needs to be set now since the
 803                          * attributes will have been updated by
 804                          * cifs_revalidate_dentry().
 805                          */
 806                         if (IS_AUTOMOUNT(d_inode(direntry)) &&
 807                            !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
 808                                 spin_lock(&direntry->d_lock);
 809                                 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
 810                                 spin_unlock(&direntry->d_lock);
 811                         }
 812
 813                         return 1;
 814                 }
 815         }
 816
 817         /*
 818          * This may be nfsd (or something), anyway, we can't see the
 819          * intent of this. So, since this can be for creation, drop it.
 820          */
 821         if (!flags)
 822                 return 0;
 823
 824         /*
 825          * Drop the negative dentry, in order to make sure to use the
 826          * case sensitive name which is specified by user if this is
 827          * for creation.
 828          */
 829         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
 830                 return 0;
 831
 832         if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
 833                 return 0;
 834
 835         return 1;
 836 }
 837
 838 /* static int cifs_d_delete(struct dentry *direntry)
 839 {
 840         int rc = 0;
 841
 842         cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
 843
 844         return rc;
 845 }     */
 846
 847 const struct dentry_operations cifs_dentry_ops = {
 848         .d_revalidate = cifs_d_revalidate,
 849         .d_automount = cifs_dfs_d_automount,
 850 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
 851 };
 852
 853 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
 854 {
 855         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
 856         unsigned long hash;
 857         wchar_t c;
 858         int i, charlen;
 859
 860         hash = init_name_hash();
 861         for (i = 0; i < q->len; i += charlen) {
 862                 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
 863                 /* error out if we can't convert the character */
 864                 if (unlikely(charlen < 0))
 865                         return charlen;
 866                 hash = partial_name_hash(cifs_toupper(c), hash);
 867         }
 868         q->hash = end_name_hash(hash);
 869
 870         return 0;
 871 }
 872
 873 static int cifs_ci_compare(const struct dentry *parent, const struct dentry *dentry,
 874                 unsigned int len, const char *str, const struct qstr *name)
 875 {
 876         struct nls_table *codepage = CIFS_SB(parent->d_sb)->local_nls;
 877         wchar_t c1, c2;
 878         int i, l1, l2;
 879
 880         /*
 881          * We make the assumption here that uppercase characters in the local
 882          * codepage are always the same length as their lowercase counterparts.
 883          *
 884          * If that's ever not the case, then this will fail to match it.
 885          */
 886         if (name->len != len)
 887                 return 1;
 888
 889         for (i = 0; i < len; i += l1) {
 890                 /* Convert characters in both strings to UTF-16. */
 891                 l1 = codepage->char2uni(&str[i], len - i, &c1);
 892                 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
 893
 894                 /*
 895                  * If we can't convert either character, just declare it to
 896                  * be 1 byte long and compare the original byte.
 897                  */
 898                 if (unlikely(l1 < 0 && l2 < 0)) {
 899                         if (str[i] != name->name[i])
 900                                 return 1;
 901                         l1 = 1;
 902                         continue;
 903                 }
 904
 905                 /*
 906                  * Here, we again ass|u|me that upper/lowercase versions of
 907                  * a character are the same length in the local NLS.
 908                  */
 909                 if (l1 != l2)
 910                         return 1;
 911
 912                 /* Now compare uppercase versions of these characters */
 913                 if (cifs_toupper(c1) != cifs_toupper(c2))
 914                         return 1;
 915         }
 916
 917         return 0;
 918 }
 919
 920 const struct dentry_operations cifs_ci_dentry_ops = {
 921         .d_revalidate = cifs_d_revalidate,
 922         .d_hash = cifs_ci_hash,
 923         .d_compare = cifs_ci_compare,
 924         .d_automount = cifs_dfs_d_automount,
 925 };