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   1 /*
   2  *   fs/cifs/dir.c
   3  *
   4  *   vfs operations that deal with dentries
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2002,2008
   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 "cifsfs.h"
  28 #include "cifspdu.h"
  29 #include "cifsglob.h"
  30 #include "cifsproto.h"
  31 #include "cifs_debug.h"
  32 #include "cifs_fs_sb.h"
  33
  34 static void
  35 renew_parental_timestamps(struct dentry *direntry)
  36 {
  37         /* BB check if there is a way to get the kernel to do this or if we
  38            really need this */
  39         do {
  40                 direntry->d_time = jiffies;
  41                 direntry = direntry->d_parent;
  42         } while (!IS_ROOT(direntry));
  43 }
  44
  45 /* Note: caller must free return buffer */
  46 char *
  47 build_path_from_dentry(struct dentry *direntry)
  48 {
  49         struct dentry *temp;
  50         int namelen;
  51         int pplen;
  52         int dfsplen;
  53         char *full_path;
  54         char dirsep;
  55         struct cifs_sb_info *cifs_sb;
  56
  57         if (direntry == NULL)
  58                 return NULL;  /* not much we can do if dentry is freed and
  59                 we need to reopen the file after it was closed implicitly
  60                 when the server crashed */
  61
  62         cifs_sb = CIFS_SB(direntry->d_sb);
  63         dirsep = CIFS_DIR_SEP(cifs_sb);
  64         pplen = cifs_sb->prepathlen;
  65         if (cifs_sb->tcon && (cifs_sb->tcon->Flags & SMB_SHARE_IS_IN_DFS))
  66                 dfsplen = strnlen(cifs_sb->tcon->treeName, MAX_TREE_SIZE + 1);
  67         else
  68                 dfsplen = 0;
  69 cifs_bp_rename_retry:
  70         namelen = pplen + dfsplen;
  71         for (temp = direntry; !IS_ROOT(temp);) {
  72                 namelen += (1 + temp->d_name.len);
  73                 temp = temp->d_parent;
  74                 if (temp == NULL) {
  75                         cERROR(1, ("corrupt dentry"));
  76                         return NULL;
  77                 }
  78         }
  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         for (temp = direntry; !IS_ROOT(temp);) {
  85                 namelen -= 1 + temp->d_name.len;
  86                 if (namelen < 0) {
  87                         break;
  88                 } else {
  89                         full_path[namelen] = dirsep;
  90                         strncpy(full_path + namelen + 1, temp->d_name.name,
  91                                 temp->d_name.len);
  92                         cFYI(0, ("name: %s", full_path + namelen));
  93                 }
  94                 temp = temp->d_parent;
  95                 if (temp == NULL) {
  96                         cERROR(1, ("corrupt dentry"));
  97                         kfree(full_path);
  98                         return NULL;
  99                 }
 100         }
 101         if (namelen != pplen + dfsplen) {
 102                 cERROR(1,
 103                        ("did not end path lookup where expected namelen is %d",
 104                         namelen));
 105                 /* presumably this is only possible if racing with a rename
 106                 of one of the parent directories  (we can not lock the dentries
 107                 above us to prevent this, but retrying should be harmless) */
 108                 kfree(full_path);
 109                 goto cifs_bp_rename_retry;
 110         }
 111         /* DIR_SEP already set for byte  0 / vs \ but not for
 112            subsequent slashes in prepath which currently must
 113            be entered the right way - not sure if there is an alternative
 114            since the '\' is a valid posix character so we can not switch
 115            those safely to '/' if any are found in the middle of the prepath */
 116         /* BB test paths to Windows with '/' in the midst of prepath */
 117
 118         if (dfsplen) {
 119                 strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
 120                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
 121                         int i;
 122                         for (i = 0; i < dfsplen; i++) {
 123                                 if (full_path[i] == '\\')
 124                                         full_path[i] = '/';
 125                         }
 126                 }
 127         }
 128         strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen);
 129         return full_path;
 130 }
 131
 132 static void setup_cifs_dentry(struct cifsTconInfo *tcon,
 133                               struct dentry *direntry,
 134                               struct inode *newinode)
 135 {
 136         if (tcon->nocase)
 137                 direntry->d_op = &cifs_ci_dentry_ops;
 138         else
 139                 direntry->d_op = &cifs_dentry_ops;
 140         d_instantiate(direntry, newinode);
 141 }
 142
 143 /* Inode operations in similar order to how they appear in Linux file fs.h */
 144
 145 int
 146 cifs_create(struct inode *inode, struct dentry *direntry, int mode,
 147                 struct nameidata *nd)
 148 {
 149         int rc = -ENOENT;
 150         int xid;
 151         int create_options = CREATE_NOT_DIR;
 152         int oplock = 0;
 153         /* BB below access is too much for the mknod to request */
 154         int desiredAccess = GENERIC_READ | GENERIC_WRITE;
 155         __u16 fileHandle;
 156         struct cifs_sb_info *cifs_sb;
 157         struct cifsTconInfo *tcon;
 158         char *full_path = NULL;
 159         FILE_ALL_INFO *buf = NULL;
 160         struct inode *newinode = NULL;
 161         struct cifsInodeInfo *pCifsInode;
 162         int disposition = FILE_OVERWRITE_IF;
 163         bool write_only = false;
 164
 165         xid = GetXid();
 166
 167         cifs_sb = CIFS_SB(inode->i_sb);
 168         tcon = cifs_sb->tcon;
 169
 170         full_path = build_path_from_dentry(direntry);
 171         if (full_path == NULL) {
 172                 FreeXid(xid);
 173                 return -ENOMEM;
 174         }
 175
 176         mode &= ~current->fs->umask;
 177
 178         if (nd && (nd->flags & LOOKUP_OPEN)) {
 179                 int oflags = nd->intent.open.flags;
 180
 181                 desiredAccess = 0;
 182                 if (oflags & FMODE_READ)
 183                         desiredAccess |= GENERIC_READ;
 184                 if (oflags & FMODE_WRITE) {
 185                         desiredAccess |= GENERIC_WRITE;
 186                         if (!(oflags & FMODE_READ))
 187                                 write_only = true;
 188                 }
 189
 190                 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
 191                         disposition = FILE_CREATE;
 192                 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
 193                         disposition = FILE_OVERWRITE_IF;
 194                 else if ((oflags & O_CREAT) == O_CREAT)
 195                         disposition = FILE_OPEN_IF;
 196                 else
 197                         cFYI(1, ("Create flag not set in create function"));
 198         }
 199
 200         /* BB add processing to set equivalent of mode - e.g. via CreateX with
 201            ACLs */
 202         if (oplockEnabled)
 203                 oplock = REQ_OPLOCK;
 204
 205         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 206         if (buf == NULL) {
 207                 kfree(full_path);
 208                 FreeXid(xid);
 209                 return -ENOMEM;
 210         }
 211
 212         /*
 213          * if we're not using unix extensions, see if we need to set
 214          * ATTR_READONLY on the create call
 215          */
 216         if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
 217                 create_options |= CREATE_OPTION_READONLY;
 218
 219         if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
 220                 rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
 221                          desiredAccess, create_options,
 222                          &fileHandle, &oplock, buf, cifs_sb->local_nls,
 223                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 224         else
 225                 rc = -EIO; /* no NT SMB support fall into legacy open below */
 226
 227         if (rc == -EIO) {
 228                 /* old server, retry the open legacy style */
 229                 rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
 230                         desiredAccess, create_options,
 231                         &fileHandle, &oplock, buf, cifs_sb->local_nls,
 232                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 233         }
 234         if (rc) {
 235                 cFYI(1, ("cifs_create returned 0x%x", rc));
 236         } else {
 237                 /* If Open reported that we actually created a file
 238                 then we now have to set the mode if possible */
 239                 if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
 240                         struct cifs_unix_set_info_args args = {
 241                                 .mode   = mode,
 242                                 .ctime  = NO_CHANGE_64,
 243                                 .atime  = NO_CHANGE_64,
 244                                 .mtime  = NO_CHANGE_64,
 245                                 .device = 0,
 246                         };
 247
 248                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 249                                 args.uid = (__u64) current_fsuid();
 250                                 if (inode->i_mode & S_ISGID)
 251                                         args.gid = (__u64) inode->i_gid;
 252                                 else
 253                                         args.gid = (__u64) current_fsgid();
 254                         } else {
 255                                 args.uid = NO_CHANGE_64;
 256                                 args.gid = NO_CHANGE_64;
 257                         }
 258                         CIFSSMBUnixSetInfo(xid, tcon, full_path, &args,
 259                                 cifs_sb->local_nls,
 260                                 cifs_sb->mnt_cifs_flags &
 261                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 262                 } else {
 263                         /* BB implement mode setting via Windows security
 264                            descriptors e.g. */
 265                         /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
 266
 267                         /* Could set r/o dos attribute if mode & 0222 == 0 */
 268                 }
 269
 270                 /* server might mask mode so we have to query for it */
 271                 if (tcon->unix_ext)
 272                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 273                                                  inode->i_sb, xid);
 274                 else {
 275                         rc = cifs_get_inode_info(&newinode, full_path,
 276                                                  buf, inode->i_sb, xid,
 277                                                  &fileHandle);
 278                         if (newinode) {
 279                                 if (cifs_sb->mnt_cifs_flags &
 280                                     CIFS_MOUNT_DYNPERM)
 281                                         newinode->i_mode = mode;
 282                                 if ((oplock & CIFS_CREATE_ACTION) &&
 283                                     (cifs_sb->mnt_cifs_flags &
 284                                      CIFS_MOUNT_SET_UID)) {
 285                                         newinode->i_uid = current_fsuid();
 286                                         if (inode->i_mode & S_ISGID)
 287                                                 newinode->i_gid =
 288                                                         inode->i_gid;
 289                                         else
 290                                                 newinode->i_gid =
 291                                                         current_fsgid();
 292                                 }
 293                         }
 294                 }
 295
 296                 if (rc != 0) {
 297                         cFYI(1, ("Create worked, get_inode_info failed rc = %d",
 298                                  rc));
 299                 } else
 300                         setup_cifs_dentry(tcon, direntry, newinode);
 301
 302                 if ((nd == NULL /* nfsd case - nfs srv does not set nd */) ||
 303                         (!(nd->flags & LOOKUP_OPEN))) {
 304                         /* mknod case - do not leave file open */
 305                         CIFSSMBClose(xid, tcon, fileHandle);
 306                 } else if (newinode) {
 307                         struct cifsFileInfo *pCifsFile =
 308                            kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
 309
 310                         if (pCifsFile == NULL)
 311                                 goto cifs_create_out;
 312                         pCifsFile->netfid = fileHandle;
 313                         pCifsFile->pid = current->tgid;
 314                         pCifsFile->pInode = newinode;
 315                         pCifsFile->invalidHandle = false;
 316                         pCifsFile->closePend     = false;
 317                         init_MUTEX(&pCifsFile->fh_sem);
 318                         mutex_init(&pCifsFile->lock_mutex);
 319                         INIT_LIST_HEAD(&pCifsFile->llist);
 320                         atomic_set(&pCifsFile->wrtPending, 0);
 321
 322                         /* set the following in open now
 323                                 pCifsFile->pfile = file; */
 324                         write_lock(&GlobalSMBSeslock);
 325                         list_add(&pCifsFile->tlist, &tcon->openFileList);
 326                         pCifsInode = CIFS_I(newinode);
 327                         if (pCifsInode) {
 328                                 /* if readable file instance put first in list*/
 329                                 if (write_only) {
 330                                         list_add_tail(&pCifsFile->flist,
 331                                                 &pCifsInode->openFileList);
 332                                 } else {
 333                                         list_add(&pCifsFile->flist,
 334                                                 &pCifsInode->openFileList);
 335                                 }
 336                                 if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
 337                                         pCifsInode->clientCanCacheAll = true;
 338                                         pCifsInode->clientCanCacheRead = true;
 339                                         cFYI(1, ("Exclusive Oplock inode %p",
 340                                                 newinode));
 341                                 } else if ((oplock & 0xF) == OPLOCK_READ)
 342                                         pCifsInode->clientCanCacheRead = true;
 343                         }
 344                         write_unlock(&GlobalSMBSeslock);
 345                 }
 346         }
 347 cifs_create_out:
 348         kfree(buf);
 349         kfree(full_path);
 350         FreeXid(xid);
 351         return rc;
 352 }
 353
 354 int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
 355                 dev_t device_number)
 356 {
 357         int rc = -EPERM;
 358         int xid;
 359         struct cifs_sb_info *cifs_sb;
 360         struct cifsTconInfo *pTcon;
 361         char *full_path = NULL;
 362         struct inode *newinode = NULL;
 363
 364         if (!old_valid_dev(device_number))
 365                 return -EINVAL;
 366
 367         xid = GetXid();
 368
 369         cifs_sb = CIFS_SB(inode->i_sb);
 370         pTcon = cifs_sb->tcon;
 371
 372         full_path = build_path_from_dentry(direntry);
 373         if (full_path == NULL)
 374                 rc = -ENOMEM;
 375         else if (pTcon->unix_ext) {
 376                 struct cifs_unix_set_info_args args = {
 377                         .mode   = mode & ~current->fs->umask,
 378                         .ctime  = NO_CHANGE_64,
 379                         .atime  = NO_CHANGE_64,
 380                         .mtime  = NO_CHANGE_64,
 381                         .device = device_number,
 382                 };
 383                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 384                         args.uid = (__u64) current_fsuid();
 385                         args.gid = (__u64) current_fsgid();
 386                 } else {
 387                         args.uid = NO_CHANGE_64;
 388                         args.gid = NO_CHANGE_64;
 389                 }
 390                 rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path,
 391                         &args, cifs_sb->local_nls,
 392                         cifs_sb->mnt_cifs_flags &
 393                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 394
 395                 if (!rc) {
 396                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 397                                                 inode->i_sb, xid);
 398                         if (pTcon->nocase)
 399                                 direntry->d_op = &cifs_ci_dentry_ops;
 400                         else
 401                                 direntry->d_op = &cifs_dentry_ops;
 402                         if (rc == 0)
 403                                 d_instantiate(direntry, newinode);
 404                 }
 405         } else {
 406                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 407                         int oplock = 0;
 408                         u16 fileHandle;
 409                         FILE_ALL_INFO *buf;
 410
 411                         cFYI(1, ("sfu compat create special file"));
 412
 413                         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 414                         if (buf == NULL) {
 415                                 kfree(full_path);
 416                                 FreeXid(xid);
 417                                 return -ENOMEM;
 418                         }
 419
 420                         rc = CIFSSMBOpen(xid, pTcon, full_path,
 421                                          FILE_CREATE, /* fail if exists */
 422                                          GENERIC_WRITE /* BB would
 423                                           WRITE_OWNER | WRITE_DAC be better? */,
 424                                          /* Create a file and set the
 425                                             file attribute to SYSTEM */
 426                                          CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
 427                                          &fileHandle, &oplock, buf,
 428                                          cifs_sb->local_nls,
 429                                          cifs_sb->mnt_cifs_flags &
 430                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 431
 432                         /* BB FIXME - add handling for backlevel servers
 433                            which need legacy open and check for all
 434                            calls to SMBOpen for fallback to SMBLeagcyOpen */
 435                         if (!rc) {
 436                                 /* BB Do not bother to decode buf since no
 437                                    local inode yet to put timestamps in,
 438                                    but we can reuse it safely */
 439                                 unsigned int bytes_written;
 440                                 struct win_dev *pdev;
 441                                 pdev = (struct win_dev *)buf;
 442                                 if (S_ISCHR(mode)) {
 443                                         memcpy(pdev->type, "IntxCHR", 8);
 444                                         pdev->major =
 445                                               cpu_to_le64(MAJOR(device_number));
 446                                         pdev->minor =
 447                                               cpu_to_le64(MINOR(device_number));
 448                                         rc = CIFSSMBWrite(xid, pTcon,
 449                                                 fileHandle,
 450                                                 sizeof(struct win_dev),
 451                                                 0, &bytes_written, (char *)pdev,
 452                                                 NULL, 0);
 453                                 } else if (S_ISBLK(mode)) {
 454                                         memcpy(pdev->type, "IntxBLK", 8);
 455                                         pdev->major =
 456                                               cpu_to_le64(MAJOR(device_number));
 457                                         pdev->minor =
 458                                               cpu_to_le64(MINOR(device_number));
 459                                         rc = CIFSSMBWrite(xid, pTcon,
 460                                                 fileHandle,
 461                                                 sizeof(struct win_dev),
 462                                                 0, &bytes_written, (char *)pdev,
 463                                                 NULL, 0);
 464                                 } /* else if(S_ISFIFO */
 465                                 CIFSSMBClose(xid, pTcon, fileHandle);
 466                                 d_drop(direntry);
 467                         }
 468                         kfree(buf);
 469                         /* add code here to set EAs */
 470                 }
 471         }
 472
 473         kfree(full_path);
 474         FreeXid(xid);
 475         return rc;
 476 }
 477
 478
 479 struct dentry *
 480 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 481             struct nameidata *nd)
 482 {
 483         int xid;
 484         int rc = 0; /* to get around spurious gcc warning, set to zero here */
 485         struct cifs_sb_info *cifs_sb;
 486         struct cifsTconInfo *pTcon;
 487         struct inode *newInode = NULL;
 488         char *full_path = NULL;
 489
 490         xid = GetXid();
 491
 492         cFYI(1, ("parent inode = 0x%p name is: %s and dentry = 0x%p",
 493               parent_dir_inode, direntry->d_name.name, direntry));
 494
 495         /* check whether path exists */
 496
 497         cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
 498         pTcon = cifs_sb->tcon;
 499
 500         /*
 501          * Don't allow the separator character in a path component.
 502          * The VFS will not allow "/", but "\" is allowed by posix.
 503          */
 504         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
 505                 int i;
 506                 for (i = 0; i < direntry->d_name.len; i++)
 507                         if (direntry->d_name.name[i] == '\\') {
 508                                 cFYI(1, ("Invalid file name"));
 509                                 FreeXid(xid);
 510                                 return ERR_PTR(-EINVAL);
 511                         }
 512         }
 513
 514         /* can not grab the rename sem here since it would
 515         deadlock in the cases (beginning of sys_rename itself)
 516         in which we already have the sb rename sem */
 517         full_path = build_path_from_dentry(direntry);
 518         if (full_path == NULL) {
 519                 FreeXid(xid);
 520                 return ERR_PTR(-ENOMEM);
 521         }
 522
 523         if (direntry->d_inode != NULL) {
 524                 cFYI(1, ("non-NULL inode in lookup"));
 525         } else {
 526                 cFYI(1, ("NULL inode in lookup"));
 527         }
 528         cFYI(1, ("Full path: %s inode = 0x%p", full_path, direntry->d_inode));
 529
 530         if (pTcon->unix_ext)
 531                 rc = cifs_get_inode_info_unix(&newInode, full_path,
 532                                               parent_dir_inode->i_sb, xid);
 533         else
 534                 rc = cifs_get_inode_info(&newInode, full_path, NULL,
 535                                          parent_dir_inode->i_sb, xid, NULL);
 536
 537         if ((rc == 0) && (newInode != NULL)) {
 538                 if (pTcon->nocase)
 539                         direntry->d_op = &cifs_ci_dentry_ops;
 540                 else
 541                         direntry->d_op = &cifs_dentry_ops;
 542                 d_add(direntry, newInode);
 543
 544                 /* since paths are not looked up by component - the parent
 545                    directories are presumed to be good here */
 546                 renew_parental_timestamps(direntry);
 547
 548         } else if (rc == -ENOENT) {
 549                 rc = 0;
 550                 direntry->d_time = jiffies;
 551                 if (pTcon->nocase)
 552                         direntry->d_op = &cifs_ci_dentry_ops;
 553                 else
 554                         direntry->d_op = &cifs_dentry_ops;
 555                 d_add(direntry, NULL);
 556         /*      if it was once a directory (but how can we tell?) we could do
 557                 shrink_dcache_parent(direntry); */
 558         } else if (rc != -EACCES) {
 559                 cERROR(1, ("Unexpected lookup error %d", rc));
 560                 /* We special case check for Access Denied - since that
 561                 is a common return code */
 562         }
 563
 564         kfree(full_path);
 565         FreeXid(xid);
 566         return ERR_PTR(rc);
 567 }
 568
 569 static int
 570 cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
 571 {
 572         int isValid = 1;
 573
 574         if (direntry->d_inode) {
 575                 if (cifs_revalidate(direntry))
 576                         return 0;
 577         } else {
 578                 cFYI(1, ("neg dentry 0x%p name = %s",
 579                          direntry, direntry->d_name.name));
 580                 if (time_after(jiffies, direntry->d_time + HZ) ||
 581                         !lookupCacheEnabled) {
 582                         d_drop(direntry);
 583                         isValid = 0;
 584                 }
 585         }
 586
 587         return isValid;
 588 }
 589
 590 /* static int cifs_d_delete(struct dentry *direntry)
 591 {
 592         int rc = 0;
 593
 594         cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
 595
 596         return rc;
 597 }     */
 598
 599 struct dentry_operations cifs_dentry_ops = {
 600         .d_revalidate = cifs_d_revalidate,
 601 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
 602 };
 603
 604 static int cifs_ci_hash(struct dentry *dentry, struct qstr *q)
 605 {
 606         struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
 607         unsigned long hash;
 608         int i;
 609
 610         hash = init_name_hash();
 611         for (i = 0; i < q->len; i++)
 612                 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
 613                                          hash);
 614         q->hash = end_name_hash(hash);
 615
 616         return 0;
 617 }
 618
 619 static int cifs_ci_compare(struct dentry *dentry, struct qstr *a,
 620                            struct qstr *b)
 621 {
 622         struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
 623
 624         if ((a->len == b->len) &&
 625             (nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
 626                 /*
 627                  * To preserve case, don't let an existing negative dentry's
 628                  * case take precedence.  If a is not a negative dentry, this
 629                  * should have no side effects
 630                  */
 631                 memcpy((void *)a->name, b->name, a->len);
 632                 return 0;
 633         }
 634         return 1;
 635 }
 636
 637 struct dentry_operations cifs_ci_dentry_ops = {
 638         .d_revalidate = cifs_d_revalidate,
 639         .d_hash = cifs_ci_hash,
 640         .d_compare = cifs_ci_compare,
 641 };