Pileus Git - ~andy/linux/blob - 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 /* Note: caller must free return buffer */
  48 char *
  49 build_path_from_dentry(struct dentry *direntry)
  50 {
  51         struct dentry *temp;
  52         int namelen;
  53         int dfsplen;
  54         char *full_path;
  55         char dirsep;
  56         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
  57         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
  58         unsigned seq;
  59
  60         dirsep = CIFS_DIR_SEP(cifs_sb);
  61         if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
  62                 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
  63         else
  64                 dfsplen = 0;
  65 cifs_bp_rename_retry:
  66         namelen = dfsplen;
  67         seq = read_seqbegin(&rename_lock);
  68         rcu_read_lock();
  69         for (temp = direntry; !IS_ROOT(temp);) {
  70                 namelen += (1 + temp->d_name.len);
  71                 temp = temp->d_parent;
  72                 if (temp == NULL) {
  73                         cERROR(1, "corrupt dentry");
  74                         rcu_read_unlock();
  75                         return NULL;
  76                 }
  77         }
  78         rcu_read_unlock();
  79
  80         full_path = kmalloc(namelen+1, GFP_KERNEL);
  81         if (full_path == NULL)
  82                 return full_path;
  83         full_path[namelen] = 0; /* trailing null */
  84         rcu_read_lock();
  85         for (temp = direntry; !IS_ROOT(temp);) {
  86                 spin_lock(&temp->d_lock);
  87                 namelen -= 1 + temp->d_name.len;
  88                 if (namelen < 0) {
  89                         spin_unlock(&temp->d_lock);
  90                         break;
  91                 } else {
  92                         full_path[namelen] = dirsep;
  93                         strncpy(full_path + namelen + 1, temp->d_name.name,
  94                                 temp->d_name.len);
  95                         cFYI(0, "name: %s", full_path + namelen);
  96                 }
  97                 spin_unlock(&temp->d_lock);
  98                 temp = temp->d_parent;
  99                 if (temp == NULL) {
 100                         cERROR(1, "corrupt dentry");
 101                         rcu_read_unlock();
 102                         kfree(full_path);
 103                         return NULL;
 104                 }
 105         }
 106         rcu_read_unlock();
 107         if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
 108                 cFYI(1, "did not end path lookup where expected. namelen=%d "
 109                         "dfsplen=%d", namelen, dfsplen);
 110                 /* presumably this is only possible if racing with a rename
 111                 of one of the parent directories  (we can not lock the dentries
 112                 above us to prevent this, but retrying should be harmless) */
 113                 kfree(full_path);
 114                 goto cifs_bp_rename_retry;
 115         }
 116         /* DIR_SEP already set for byte  0 / vs \ but not for
 117            subsequent slashes in prepath which currently must
 118            be entered the right way - not sure if there is an alternative
 119            since the '\' is a valid posix character so we can not switch
 120            those safely to '/' if any are found in the middle of the prepath */
 121         /* BB test paths to Windows with '/' in the midst of prepath */
 122
 123         if (dfsplen) {
 124                 strncpy(full_path, tcon->treeName, dfsplen);
 125                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
 126                         int i;
 127                         for (i = 0; i < dfsplen; i++) {
 128                                 if (full_path[i] == '\\')
 129                                         full_path[i] = '/';
 130                         }
 131                 }
 132         }
 133         return full_path;
 134 }
 135
 136 /*
 137  * Don't allow the separator character in a path component.
 138  * The VFS will not allow "/", but "\" is allowed by posix.
 139  */
 140 static int
 141 check_name(struct dentry *direntry)
 142 {
 143         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
 144         int i;
 145
 146         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
 147                 for (i = 0; i < direntry->d_name.len; i++) {
 148                         if (direntry->d_name.name[i] == '\\') {
 149                                 cFYI(1, "Invalid file name");
 150                                 return -EINVAL;
 151                         }
 152                 }
 153         }
 154         return 0;
 155 }
 156
 157
 158 /* Inode operations in similar order to how they appear in Linux file fs.h */
 159
 160 static int
 161 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
 162                struct tcon_link *tlink, unsigned oflags, umode_t mode,
 163                __u32 *oplock, struct cifs_fid *fid, int *created)
 164 {
 165         int rc = -ENOENT;
 166         int create_options = CREATE_NOT_DIR;
 167         int desired_access;
 168         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 169         struct cifs_tcon *tcon = tlink_tcon(tlink);
 170         char *full_path = NULL;
 171         FILE_ALL_INFO *buf = NULL;
 172         struct inode *newinode = NULL;
 173         int disposition;
 174         struct TCP_Server_Info *server = tcon->ses->server;
 175
 176         *oplock = 0;
 177         if (tcon->ses->server->oplocks)
 178                 *oplock = REQ_OPLOCK;
 179
 180         full_path = build_path_from_dentry(direntry);
 181         if (full_path == NULL) {
 182                 rc = -ENOMEM;
 183                 goto out;
 184         }
 185
 186         if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
 187             (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 188                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 189                 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
 190                                      oflags, oplock, &fid->netfid, xid);
 191                 switch (rc) {
 192                 case 0:
 193                         if (newinode == NULL) {
 194                                 /* query inode info */
 195                                 goto cifs_create_get_file_info;
 196                         }
 197
 198                         if (!S_ISREG(newinode->i_mode)) {
 199                                 /*
 200                                  * The server may allow us to open things like
 201                                  * FIFOs, but the client isn't set up to deal
 202                                  * with that. If it's not a regular file, just
 203                                  * close it and proceed as if it were a normal
 204                                  * lookup.
 205                                  */
 206                                 CIFSSMBClose(xid, tcon, fid->netfid);
 207                                 goto cifs_create_get_file_info;
 208                         }
 209                         /* success, no need to query */
 210                         goto cifs_create_set_dentry;
 211
 212                 case -ENOENT:
 213                         goto cifs_create_get_file_info;
 214
 215                 case -EIO:
 216                 case -EINVAL:
 217                         /*
 218                          * EIO could indicate that (posix open) operation is not
 219                          * supported, despite what server claimed in capability
 220                          * negotiation.
 221                          *
 222                          * POSIX open in samba versions 3.3.1 and earlier could
 223                          * incorrectly fail with invalid parameter.
 224                          */
 225                         tcon->broken_posix_open = true;
 226                         break;
 227
 228                 case -EREMOTE:
 229                 case -EOPNOTSUPP:
 230                         /*
 231                          * EREMOTE indicates DFS junction, which is not handled
 232                          * in posix open.  If either that or op not supported
 233                          * returned, follow the normal lookup.
 234                          */
 235                         break;
 236
 237                 default:
 238                         goto out;
 239                 }
 240                 /*
 241                  * fallthrough to retry, using older open call, this is case
 242                  * where server does not support this SMB level, and falsely
 243                  * claims capability (also get here for DFS case which should be
 244                  * rare for path not covered on files)
 245                  */
 246         }
 247
 248         desired_access = 0;
 249         if (OPEN_FMODE(oflags) & FMODE_READ)
 250                 desired_access |= GENERIC_READ; /* is this too little? */
 251         if (OPEN_FMODE(oflags) & FMODE_WRITE)
 252                 desired_access |= GENERIC_WRITE;
 253
 254         disposition = FILE_OVERWRITE_IF;
 255         if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
 256                 disposition = FILE_CREATE;
 257         else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
 258                 disposition = FILE_OVERWRITE_IF;
 259         else if ((oflags & O_CREAT) == O_CREAT)
 260                 disposition = FILE_OPEN_IF;
 261         else
 262                 cFYI(1, "Create flag not set in create function");
 263
 264         /*
 265          * BB add processing to set equivalent of mode - e.g. via CreateX with
 266          * ACLs
 267          */
 268
 269         if (!server->ops->open) {
 270                 rc = -ENOSYS;
 271                 goto out;
 272         }
 273
 274         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 275         if (buf == NULL) {
 276                 rc = -ENOMEM;
 277                 goto out;
 278         }
 279
 280         /*
 281          * if we're not using unix extensions, see if we need to set
 282          * ATTR_READONLY on the create call
 283          */
 284         if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
 285                 create_options |= CREATE_OPTION_READONLY;
 286
 287         if (backup_cred(cifs_sb))
 288                 create_options |= CREATE_OPEN_BACKUP_INTENT;
 289
 290         rc = server->ops->open(xid, tcon, full_path, disposition,
 291                                desired_access, create_options, fid, oplock,
 292                                buf, cifs_sb);
 293         if (rc) {
 294                 cFYI(1, "cifs_create returned 0x%x", rc);
 295                 goto out;
 296         }
 297
 298         /*
 299          * If Open reported that we actually created a file then we now have to
 300          * set the mode if possible.
 301          */
 302         if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
 303                 struct cifs_unix_set_info_args args = {
 304                                 .mode   = mode,
 305                                 .ctime  = NO_CHANGE_64,
 306                                 .atime  = NO_CHANGE_64,
 307                                 .mtime  = NO_CHANGE_64,
 308                                 .device = 0,
 309                 };
 310
 311                 *created |= FILE_CREATED;
 312                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 313                         args.uid = (__u64) current_fsuid();
 314                         if (inode->i_mode & S_ISGID)
 315                                 args.gid = (__u64) inode->i_gid;
 316                         else
 317                                 args.gid = (__u64) current_fsgid();
 318                 } else {
 319                         args.uid = NO_CHANGE_64;
 320                         args.gid = NO_CHANGE_64;
 321                 }
 322                 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
 323                                        current->tgid);
 324         } else {
 325                 /*
 326                  * BB implement mode setting via Windows security
 327                  * descriptors e.g.
 328                  */
 329                 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
 330
 331                 /* Could set r/o dos attribute if mode & 0222 == 0 */
 332         }
 333
 334 cifs_create_get_file_info:
 335         /* server might mask mode so we have to query for it */
 336         if (tcon->unix_ext)
 337                 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
 338                                               xid);
 339         else {
 340                 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
 341                                          xid, &fid->netfid);
 342                 if (newinode) {
 343                         if (server->ops->set_lease_key)
 344                                 server->ops->set_lease_key(newinode, fid);
 345                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 346                                 newinode->i_mode = mode;
 347                         if ((*oplock & CIFS_CREATE_ACTION) &&
 348                             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
 349                                 newinode->i_uid = current_fsuid();
 350                                 if (inode->i_mode & S_ISGID)
 351                                         newinode->i_gid = inode->i_gid;
 352                                 else
 353                                         newinode->i_gid = current_fsgid();
 354                         }
 355                 }
 356         }
 357
 358 cifs_create_set_dentry:
 359         if (rc != 0) {
 360                 cFYI(1, "Create worked, get_inode_info failed rc = %d", rc);
 361                 if (server->ops->close)
 362                         server->ops->close(xid, tcon, fid);
 363                 goto out;
 364         }
 365         d_drop(direntry);
 366         d_add(direntry, newinode);
 367
 368 out:
 369         kfree(buf);
 370         kfree(full_path);
 371         return rc;
 372 }
 373
 374 int
 375 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
 376                  struct file *file, unsigned oflags, umode_t mode,
 377                  int *opened)
 378 {
 379         int rc;
 380         unsigned int xid;
 381         struct tcon_link *tlink;
 382         struct cifs_tcon *tcon;
 383         struct TCP_Server_Info *server;
 384         struct cifs_fid fid;
 385         struct cifs_pending_open open;
 386         __u32 oplock;
 387         struct cifsFileInfo *file_info;
 388
 389         /*
 390          * Posix open is only called (at lookup time) for file create now. For
 391          * opens (rather than creates), because we do not know if it is a file
 392          * or directory yet, and current Samba no longer allows us to do posix
 393          * open on dirs, we could end up wasting an open call on what turns out
 394          * to be a dir. For file opens, we wait to call posix open till
 395          * cifs_open.  It could be added to atomic_open in the future but the
 396          * performance tradeoff of the extra network request when EISDIR or
 397          * EACCES is returned would have to be weighed against the 50% reduction
 398          * in network traffic in the other paths.
 399          */
 400         if (!(oflags & O_CREAT)) {
 401                 struct dentry *res = cifs_lookup(inode, direntry, 0);
 402                 if (IS_ERR(res))
 403                         return PTR_ERR(res);
 404
 405                 return finish_no_open(file, res);
 406         }
 407
 408         rc = check_name(direntry);
 409         if (rc)
 410                 return rc;
 411
 412         xid = get_xid();
 413
 414         cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
 415              inode, direntry->d_name.name, direntry);
 416
 417         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
 418         if (IS_ERR(tlink))
 419                 goto out_free_xid;
 420
 421         tcon = tlink_tcon(tlink);
 422         server = tcon->ses->server;
 423
 424         if (server->ops->new_lease_key)
 425                 server->ops->new_lease_key(&fid);
 426
 427         cifs_add_pending_open(&fid, tlink, &open);
 428
 429         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
 430                             &oplock, &fid, opened);
 431
 432         if (rc) {
 433                 cifs_del_pending_open(&open);
 434                 goto out;
 435         }
 436
 437         rc = finish_open(file, direntry, generic_file_open, opened);
 438         if (rc) {
 439                 if (server->ops->close)
 440                         server->ops->close(xid, tcon, &fid);
 441                 cifs_del_pending_open(&open);
 442                 goto out;
 443         }
 444
 445         file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
 446         if (file_info == NULL) {
 447                 if (server->ops->close)
 448                         server->ops->close(xid, tcon, &fid);
 449                 cifs_del_pending_open(&open);
 450                 rc = -ENOMEM;
 451         }
 452
 453 out:
 454         cifs_put_tlink(tlink);
 455 out_free_xid:
 456         free_xid(xid);
 457         return rc;
 458 }
 459
 460 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
 461                 bool excl)
 462 {
 463         int rc;
 464         unsigned int xid = get_xid();
 465         /*
 466          * BB below access is probably too much for mknod to request
 467          *    but we have to do query and setpathinfo so requesting
 468          *    less could fail (unless we want to request getatr and setatr
 469          *    permissions (only).  At least for POSIX we do not have to
 470          *    request so much.
 471          */
 472         unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
 473         struct tcon_link *tlink;
 474         struct cifs_tcon *tcon;
 475         struct TCP_Server_Info *server;
 476         struct cifs_fid fid;
 477         __u32 oplock;
 478         int created = FILE_CREATED;
 479
 480         cFYI(1, "cifs_create parent inode = 0x%p name is: %s and dentry = 0x%p",
 481              inode, direntry->d_name.name, direntry);
 482
 483         tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
 484         rc = PTR_ERR(tlink);
 485         if (IS_ERR(tlink))
 486                 goto out_free_xid;
 487
 488         tcon = tlink_tcon(tlink);
 489         server = tcon->ses->server;
 490
 491         if (server->ops->new_lease_key)
 492                 server->ops->new_lease_key(&fid);
 493
 494         rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
 495                             &oplock, &fid, &created);
 496         if (!rc && server->ops->close)
 497                 server->ops->close(xid, tcon, &fid);
 498
 499         cifs_put_tlink(tlink);
 500 out_free_xid:
 501         free_xid(xid);
 502         return rc;
 503 }
 504
 505 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
 506                 dev_t device_number)
 507 {
 508         int rc = -EPERM;
 509         unsigned int xid;
 510         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
 511         struct cifs_sb_info *cifs_sb;
 512         struct tcon_link *tlink;
 513         struct cifs_tcon *pTcon;
 514         struct cifs_io_parms io_parms;
 515         char *full_path = NULL;
 516         struct inode *newinode = NULL;
 517         int oplock = 0;
 518         u16 fileHandle;
 519         FILE_ALL_INFO *buf = NULL;
 520         unsigned int bytes_written;
 521         struct win_dev *pdev;
 522
 523         if (!old_valid_dev(device_number))
 524                 return -EINVAL;
 525
 526         cifs_sb = CIFS_SB(inode->i_sb);
 527         tlink = cifs_sb_tlink(cifs_sb);
 528         if (IS_ERR(tlink))
 529                 return PTR_ERR(tlink);
 530
 531         pTcon = tlink_tcon(tlink);
 532
 533         xid = get_xid();
 534
 535         full_path = build_path_from_dentry(direntry);
 536         if (full_path == NULL) {
 537                 rc = -ENOMEM;
 538                 goto mknod_out;
 539         }
 540
 541         if (pTcon->unix_ext) {
 542                 struct cifs_unix_set_info_args args = {
 543                         .mode   = mode & ~current_umask(),
 544                         .ctime  = NO_CHANGE_64,
 545                         .atime  = NO_CHANGE_64,
 546                         .mtime  = NO_CHANGE_64,
 547                         .device = device_number,
 548                 };
 549                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 550                         args.uid = (__u64) current_fsuid();
 551                         args.gid = (__u64) current_fsgid();
 552                 } else {
 553                         args.uid = NO_CHANGE_64;
 554                         args.gid = NO_CHANGE_64;
 555                 }
 556                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
 557                                             cifs_sb->local_nls,
 558                                             cifs_sb->mnt_cifs_flags &
 559                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 560                 if (rc)
 561                         goto mknod_out;
 562
 563                 rc = cifs_get_inode_info_unix(&newinode, full_path,
 564                                                 inode->i_sb, xid);
 565
 566                 if (rc == 0)
 567                         d_instantiate(direntry, newinode);
 568                 goto mknod_out;
 569         }
 570
 571         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
 572                 goto mknod_out;
 573
 574
 575         cFYI(1, "sfu compat create special file");
 576
 577         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 578         if (buf == NULL) {
 579                 kfree(full_path);
 580                 rc = -ENOMEM;
 581                 free_xid(xid);
 582                 return rc;
 583         }
 584
 585         if (backup_cred(cifs_sb))
 586                 create_options |= CREATE_OPEN_BACKUP_INTENT;
 587
 588         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
 589                          GENERIC_WRITE, create_options,
 590                          &fileHandle, &oplock, buf, cifs_sb->local_nls,
 591                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 592         if (rc)
 593                 goto mknod_out;
 594
 595         /* BB Do not bother to decode buf since no local inode yet to put
 596          * timestamps in, but we can reuse it safely */
 597
 598         pdev = (struct win_dev *)buf;
 599         io_parms.netfid = fileHandle;
 600         io_parms.pid = current->tgid;
 601         io_parms.tcon = pTcon;
 602         io_parms.offset = 0;
 603         io_parms.length = sizeof(struct win_dev);
 604         if (S_ISCHR(mode)) {
 605                 memcpy(pdev->type, "IntxCHR", 8);
 606                 pdev->major =
 607                       cpu_to_le64(MAJOR(device_number));
 608                 pdev->minor =
 609                       cpu_to_le64(MINOR(device_number));
 610                 rc = CIFSSMBWrite(xid, &io_parms,
 611                         &bytes_written, (char *)pdev,
 612                         NULL, 0);
 613         } else if (S_ISBLK(mode)) {
 614                 memcpy(pdev->type, "IntxBLK", 8);
 615                 pdev->major =
 616                       cpu_to_le64(MAJOR(device_number));
 617                 pdev->minor =
 618                       cpu_to_le64(MINOR(device_number));
 619                 rc = CIFSSMBWrite(xid, &io_parms,
 620                         &bytes_written, (char *)pdev,
 621                         NULL, 0);
 622         } /* else if (S_ISFIFO) */
 623         CIFSSMBClose(xid, pTcon, fileHandle);
 624         d_drop(direntry);
 625
 626         /* FIXME: add code here to set EAs */
 627
 628 mknod_out:
 629         kfree(full_path);
 630         kfree(buf);
 631         free_xid(xid);
 632         cifs_put_tlink(tlink);
 633         return rc;
 634 }
 635
 636 struct dentry *
 637 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 638             unsigned int flags)
 639 {
 640         unsigned int xid;
 641         int rc = 0; /* to get around spurious gcc warning, set to zero here */
 642         struct cifs_sb_info *cifs_sb;
 643         struct tcon_link *tlink;
 644         struct cifs_tcon *pTcon;
 645         struct inode *newInode = NULL;
 646         char *full_path = NULL;
 647
 648         xid = get_xid();
 649
 650         cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
 651               parent_dir_inode, direntry->d_name.name, direntry);
 652
 653         /* check whether path exists */
 654
 655         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
 656         tlink = cifs_sb_tlink(cifs_sb);
 657         if (IS_ERR(tlink)) {
 658                 free_xid(xid);
 659                 return (struct dentry *)tlink;
 660         }
 661         pTcon = tlink_tcon(tlink);
 662
 663         rc = check_name(direntry);
 664         if (rc)
 665                 goto lookup_out;
 666
 667         /* can not grab the rename sem here since it would
 668         deadlock in the cases (beginning of sys_rename itself)
 669         in which we already have the sb rename sem */
 670         full_path = build_path_from_dentry(direntry);
 671         if (full_path == NULL) {
 672                 rc = -ENOMEM;
 673                 goto lookup_out;
 674         }
 675
 676         if (direntry->d_inode != NULL) {
 677                 cFYI(1, "non-NULL inode in lookup");
 678         } else {
 679                 cFYI(1, "NULL inode in lookup");
 680         }
 681         cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);
 682
 683         if (pTcon->unix_ext) {
 684                 rc = cifs_get_inode_info_unix(&newInode, full_path,
 685                                               parent_dir_inode->i_sb, xid);
 686         } else {
 687                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
 688                                 parent_dir_inode->i_sb, xid, NULL);
 689         }
 690
 691         if ((rc == 0) && (newInode != NULL)) {
 692                 d_add(direntry, newInode);
 693                 /* since paths are not looked up by component - the parent
 694                    directories are presumed to be good here */
 695                 renew_parental_timestamps(direntry);
 696
 697         } else if (rc == -ENOENT) {
 698                 rc = 0;
 699                 direntry->d_time = jiffies;
 700                 d_add(direntry, NULL);
 701         /*      if it was once a directory (but how can we tell?) we could do
 702                 shrink_dcache_parent(direntry); */
 703         } else if (rc != -EACCES) {
 704                 cERROR(1, "Unexpected lookup error %d", rc);
 705                 /* We special case check for Access Denied - since that
 706                 is a common return code */
 707         }
 708
 709 lookup_out:
 710         kfree(full_path);
 711         cifs_put_tlink(tlink);
 712         free_xid(xid);
 713         return ERR_PTR(rc);
 714 }
 715
 716 static int
 717 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
 718 {
 719         if (flags & LOOKUP_RCU)
 720                 return -ECHILD;
 721
 722         if (direntry->d_inode) {
 723                 if (cifs_revalidate_dentry(direntry))
 724                         return 0;
 725                 else {
 726                         /*
 727                          * If the inode wasn't known to be a dfs entry when
 728                          * the dentry was instantiated, such as when created
 729                          * via ->readdir(), it needs to be set now since the
 730                          * attributes will have been updated by
 731                          * cifs_revalidate_dentry().
 732                          */
 733                         if (IS_AUTOMOUNT(direntry->d_inode) &&
 734                            !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
 735                                 spin_lock(&direntry->d_lock);
 736                                 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
 737                                 spin_unlock(&direntry->d_lock);
 738                         }
 739
 740                         return 1;
 741                 }
 742         }
 743
 744         /*
 745          * This may be nfsd (or something), anyway, we can't see the
 746          * intent of this. So, since this can be for creation, drop it.
 747          */
 748         if (!flags)
 749                 return 0;
 750
 751         /*
 752          * Drop the negative dentry, in order to make sure to use the
 753          * case sensitive name which is specified by user if this is
 754          * for creation.
 755          */
 756         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
 757                 return 0;
 758
 759         if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
 760                 return 0;
 761
 762         return 1;
 763 }
 764
 765 /* static int cifs_d_delete(struct dentry *direntry)
 766 {
 767         int rc = 0;
 768
 769         cFYI(1, "In cifs d_delete, name = %s", direntry->d_name.name);
 770
 771         return rc;
 772 }     */
 773
 774 const struct dentry_operations cifs_dentry_ops = {
 775         .d_revalidate = cifs_d_revalidate,
 776         .d_automount = cifs_dfs_d_automount,
 777 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
 778 };
 779
 780 static int cifs_ci_hash(const struct dentry *dentry, const struct inode *inode,
 781                 struct qstr *q)
 782 {
 783         struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
 784         unsigned long hash;
 785         int i;
 786
 787         hash = init_name_hash();
 788         for (i = 0; i < q->len; i++)
 789                 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
 790                                          hash);
 791         q->hash = end_name_hash(hash);
 792
 793         return 0;
 794 }
 795
 796 static int cifs_ci_compare(const struct dentry *parent,
 797                 const struct inode *pinode,
 798                 const struct dentry *dentry, const struct inode *inode,
 799                 unsigned int len, const char *str, const struct qstr *name)
 800 {
 801         struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;
 802
 803         if ((name->len == len) &&
 804             (nls_strnicmp(codepage, name->name, str, len) == 0))
 805                 return 0;
 806         return 1;
 807 }
 808
 809 const struct dentry_operations cifs_ci_dentry_ops = {
 810         .d_revalidate = cifs_d_revalidate,
 811         .d_hash = cifs_ci_hash,
 812         .d_compare = cifs_ci_compare,
 813         .d_automount = cifs_dfs_d_automount,
 814 };