fs/cifs/readdir.c

   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004, 2005
   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/pagemap.h>
  25 #include <linux/stat.h>
  26 #include <linux/smp_lock.h>
  27 #include "cifspdu.h"
  28 #include "cifsglob.h"
  29 #include "cifsproto.h"
  30 #include "cifs_unicode.h"
  31 #include "cifs_debug.h"
  32 #include "cifs_fs_sb.h"
  33 #include "cifsfs.h"
  34
  35 #ifdef CONFIG_CIFS_DEBUG2
  36 static void dump_cifs_file_struct(struct file *file, char *label)
  37 {
  38         struct cifsFileInfo * cf;
  39
  40         if(file) {
  41                 cf = file->private_data;
  42                 if(cf == NULL) {
  43                         cFYI(1,("empty cifs private file data"));
  44                         return;
  45                 }
  46                 if(cf->invalidHandle) {
  47                         cFYI(1,("invalid handle"));
  48                 }
  49                 if(cf->srch_inf.endOfSearch) {
  50                         cFYI(1,("end of search"));
  51                 }
  52                 if(cf->srch_inf.emptyDir) {
  53                         cFYI(1,("empty dir"));
  54                 }
  55
  56         }
  57 }
  58 #endif /* DEBUG2 */
  59
  60 /* Returns one if new inode created (which therefore needs to be hashed) */
  61 /* Might check in the future if inode number changed so we can rehash inode */
  62 static int construct_dentry(struct qstr *qstring, struct file *file,
  63         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  64 {
  65         struct dentry *tmp_dentry;
  66         struct cifs_sb_info *cifs_sb;
  67         struct cifsTconInfo *pTcon;
  68         int rc = 0;
  69
  70         cFYI(1, ("For %s", qstring->name));
  71         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
  72         pTcon = cifs_sb->tcon;
  73
  74         qstring->hash = full_name_hash(qstring->name, qstring->len);
  75         tmp_dentry = d_lookup(file->f_dentry, qstring);
  76         if (tmp_dentry) {
  77                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
  78                 *ptmp_inode = tmp_dentry->d_inode;
  79 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
  80                 if(*ptmp_inode == NULL) {
  81                         *ptmp_inode = new_inode(file->f_dentry->d_sb);
  82                         if(*ptmp_inode == NULL)
  83                                 return rc;
  84                         rc = 1;
  85                         d_instantiate(tmp_dentry, *ptmp_inode);
  86                 }
  87         } else {
  88                 tmp_dentry = d_alloc(file->f_dentry, qstring);
  89                 if(tmp_dentry == NULL) {
  90                         cERROR(1,("Failed allocating dentry"));
  91                         *ptmp_inode = NULL;
  92                         return rc;
  93                 }
  94
  95                 *ptmp_inode = new_inode(file->f_dentry->d_sb);
  96                 if (pTcon->nocase)
  97                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
  98                 else
  99                         tmp_dentry->d_op = &cifs_dentry_ops;
 100                 if(*ptmp_inode == NULL)
 101                         return rc;
 102                 rc = 1;
 103                 d_instantiate(tmp_dentry, *ptmp_inode);
 104                 d_rehash(tmp_dentry);
 105         }
 106
 107         tmp_dentry->d_time = jiffies;
 108         *pnew_dentry = tmp_dentry;
 109         return rc;
 110 }
 111
 112 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
 113                 char * buf, int *pobject_type, int isNewInode)
 114 {
 115         loff_t local_size;
 116         struct timespec local_mtime;
 117
 118         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 119         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 120         __u32 attr;
 121         __u64 allocation_size;
 122         __u64 end_of_file;
 123
 124         /* save mtime and size */
 125         local_mtime = tmp_inode->i_mtime;
 126         local_size  = tmp_inode->i_size;
 127
 128         if(new_buf_type) {
 129                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
 130
 131                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 132                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 133                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 134                 tmp_inode->i_atime =
 135                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 136                 tmp_inode->i_mtime =
 137                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 138                 tmp_inode->i_ctime =
 139                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 140         } else { /* legacy, OS2 and DOS style */
 141                 FIND_FILE_STANDARD_INFO * pfindData =
 142                         (FIND_FILE_STANDARD_INFO *)buf;
 143
 144                 attr = le16_to_cpu(pfindData->Attributes);
 145                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
 146                 end_of_file = le32_to_cpu(pfindData->DataSize);
 147                 tmp_inode->i_atime = CURRENT_TIME;
 148                 /* tmp_inode->i_mtime =  BB FIXME - add dos time handling
 149                 tmp_inode->i_ctime = 0;   BB FIXME */
 150
 151         }
 152
 153         /* Linux can not store file creation time unfortunately so ignore it */
 154
 155         cifsInfo->cifsAttrs = attr;
 156         cifsInfo->time = jiffies;
 157
 158         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 159         /* 2767 perms - indicate mandatory locking */
 160                 /* BB fill in uid and gid here? with help from winbind?
 161                    or retrieve from NTFS stream extended attribute */
 162         if (atomic_read(&cifsInfo->inUse) == 0) {
 163                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 164                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 165                 /* set default mode. will override for dirs below */
 166                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 167         } else {
 168                 /* mask off the type bits since it gets set
 169                 below and we do not want to get two type
 170                 bits set */
 171                 tmp_inode->i_mode &= ~S_IFMT;
 172         }
 173
 174         if (attr & ATTR_DIRECTORY) {
 175                 *pobject_type = DT_DIR;
 176                 /* override default perms since we do not lock dirs */
 177                 if(atomic_read(&cifsInfo->inUse) == 0) {
 178                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 179                 }
 180                 tmp_inode->i_mode |= S_IFDIR;
 181         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 182                    (attr & ATTR_SYSTEM)) {
 183                 if (end_of_file == 0)  {
 184                         *pobject_type = DT_FIFO;
 185                         tmp_inode->i_mode |= S_IFIFO;
 186                 } else {
 187                         /* rather than get the type here, we mark the
 188                         inode as needing revalidate and get the real type
 189                         (blk vs chr vs. symlink) later ie in lookup */
 190                         *pobject_type = DT_REG;
 191                         tmp_inode->i_mode |= S_IFREG;
 192                         cifsInfo->time = 0;
 193                 }
 194 /* we no longer mark these because we could not follow them */
 195 /*        } else if (attr & ATTR_REPARSE) {
 196                 *pobject_type = DT_LNK;
 197                 tmp_inode->i_mode |= S_IFLNK; */
 198         } else {
 199                 *pobject_type = DT_REG;
 200                 tmp_inode->i_mode |= S_IFREG;
 201                 if (attr & ATTR_READONLY)
 202                         tmp_inode->i_mode &= ~(S_IWUGO);
 203         } /* could add code here - to validate if device or weird share type? */
 204
 205         /* can not fill in nlink here as in qpathinfo version and Unx search */
 206         if (atomic_read(&cifsInfo->inUse) == 0) {
 207                 atomic_set(&cifsInfo->inUse, 1);
 208         }
 209
 210         if (is_size_safe_to_change(cifsInfo)) {
 211                 /* can not safely change the file size here if the
 212                 client is writing to it due to potential races */
 213                 i_size_write(tmp_inode, end_of_file);
 214
 215         /* 512 bytes (2**9) is the fake blocksize that must be used */
 216         /* for this calculation, even though the reported blocksize is larger */
 217                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 218         }
 219
 220         if (allocation_size < end_of_file)
 221                 cFYI(1, ("May be sparse file, allocation less than file size"));
 222         cFYI(1, ("File Size %ld and blocks %llu and blocksize %ld",
 223                 (unsigned long)tmp_inode->i_size,
 224                 (unsigned long long)tmp_inode->i_blocks,
 225                 tmp_inode->i_blksize));
 226         if (S_ISREG(tmp_inode->i_mode)) {
 227                 cFYI(1, ("File inode"));
 228                 tmp_inode->i_op = &cifs_file_inode_ops;
 229                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 230                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 231                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 232                         else
 233                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 234
 235                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 236                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 237                 else
 238                         tmp_inode->i_fop = &cifs_file_ops;
 239
 240                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 241                    (cifs_sb->tcon->ses->server->maxBuf <
 242                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 243                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 244                 else
 245                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 246
 247                 if(isNewInode)
 248                         return; /* No sense invalidating pages for new inode
 249                                    since have not started caching readahead file
 250                                    data yet */
 251
 252                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 253                         (local_size == tmp_inode->i_size)) {
 254                         cFYI(1, ("inode exists but unchanged"));
 255                 } else {
 256                         /* file may have changed on server */
 257                         cFYI(1, ("invalidate inode, readdir detected change"));
 258                         invalidate_remote_inode(tmp_inode);
 259                 }
 260         } else if (S_ISDIR(tmp_inode->i_mode)) {
 261                 cFYI(1, ("Directory inode"));
 262                 tmp_inode->i_op = &cifs_dir_inode_ops;
 263                 tmp_inode->i_fop = &cifs_dir_ops;
 264         } else if (S_ISLNK(tmp_inode->i_mode)) {
 265                 cFYI(1, ("Symbolic Link inode"));
 266                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 267         } else {
 268                 cFYI(1, ("Init special inode"));
 269                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 270                                    tmp_inode->i_rdev);
 271         }
 272 }
 273
 274 static void unix_fill_in_inode(struct inode *tmp_inode,
 275         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 276 {
 277         loff_t local_size;
 278         struct timespec local_mtime;
 279
 280         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 281         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 282
 283         __u32 type = le32_to_cpu(pfindData->Type);
 284         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 285         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 286         cifsInfo->time = jiffies;
 287         atomic_inc(&cifsInfo->inUse);
 288
 289         /* save mtime and size */
 290         local_mtime = tmp_inode->i_mtime;
 291         local_size  = tmp_inode->i_size;
 292
 293         tmp_inode->i_atime =
 294             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 295         tmp_inode->i_mtime =
 296             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 297         tmp_inode->i_ctime =
 298             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 299
 300         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 301         /* since we set the inode type below we need to mask off type
 302            to avoid strange results if bits above were corrupt */
 303         tmp_inode->i_mode &= ~S_IFMT;
 304         if (type == UNIX_FILE) {
 305                 *pobject_type = DT_REG;
 306                 tmp_inode->i_mode |= S_IFREG;
 307         } else if (type == UNIX_SYMLINK) {
 308                 *pobject_type = DT_LNK;
 309                 tmp_inode->i_mode |= S_IFLNK;
 310         } else if (type == UNIX_DIR) {
 311                 *pobject_type = DT_DIR;
 312                 tmp_inode->i_mode |= S_IFDIR;
 313         } else if (type == UNIX_CHARDEV) {
 314                 *pobject_type = DT_CHR;
 315                 tmp_inode->i_mode |= S_IFCHR;
 316                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 317                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 318         } else if (type == UNIX_BLOCKDEV) {
 319                 *pobject_type = DT_BLK;
 320                 tmp_inode->i_mode |= S_IFBLK;
 321                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 322                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 323         } else if (type == UNIX_FIFO) {
 324                 *pobject_type = DT_FIFO;
 325                 tmp_inode->i_mode |= S_IFIFO;
 326         } else if (type == UNIX_SOCKET) {
 327                 *pobject_type = DT_SOCK;
 328                 tmp_inode->i_mode |= S_IFSOCK;
 329         } else {
 330                 /* safest to just call it a file */
 331                 *pobject_type = DT_REG;
 332                 tmp_inode->i_mode |= S_IFREG;
 333                 cFYI(1,("unknown inode type %d",type));
 334         }
 335
 336         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 337         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 338         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 339
 340         if (is_size_safe_to_change(cifsInfo)) {
 341                 /* can not safely change the file size here if the
 342                 client is writing to it due to potential races */
 343                 i_size_write(tmp_inode,end_of_file);
 344
 345         /* 512 bytes (2**9) is the fake blocksize that must be used */
 346         /* for this calculation, not the real blocksize */
 347                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 348         }
 349
 350         if (S_ISREG(tmp_inode->i_mode)) {
 351                 cFYI(1, ("File inode"));
 352                 tmp_inode->i_op = &cifs_file_inode_ops;
 353
 354                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 355                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 356                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 357                         else
 358                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 359
 360                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 361                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 362                 else
 363                         tmp_inode->i_fop = &cifs_file_ops;
 364
 365                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 366                    (cifs_sb->tcon->ses->server->maxBuf <
 367                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 368                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 369                 else
 370                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 371
 372                 if(isNewInode)
 373                         return; /* No sense invalidating pages for new inode since we
 374                                            have not started caching readahead file data yet */
 375
 376                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 377                         (local_size == tmp_inode->i_size)) {
 378                         cFYI(1, ("inode exists but unchanged"));
 379                 } else {
 380                         /* file may have changed on server */
 381                         cFYI(1, ("invalidate inode, readdir detected change"));
 382                         invalidate_remote_inode(tmp_inode);
 383                 }
 384         } else if (S_ISDIR(tmp_inode->i_mode)) {
 385                 cFYI(1, ("Directory inode"));
 386                 tmp_inode->i_op = &cifs_dir_inode_ops;
 387                 tmp_inode->i_fop = &cifs_dir_ops;
 388         } else if (S_ISLNK(tmp_inode->i_mode)) {
 389                 cFYI(1, ("Symbolic Link inode"));
 390                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 391 /* tmp_inode->i_fop = *//* do not need to set to anything */
 392         } else {
 393                 cFYI(1, ("Special inode"));
 394                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 395                                    tmp_inode->i_rdev);
 396         }
 397 }
 398
 399 static int initiate_cifs_search(const int xid, struct file *file)
 400 {
 401         int rc = 0;
 402         char * full_path;
 403         struct cifsFileInfo * cifsFile;
 404         struct cifs_sb_info *cifs_sb;
 405         struct cifsTconInfo *pTcon;
 406
 407         if(file->private_data == NULL) {
 408                 file->private_data =
 409                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 410         }
 411
 412         if(file->private_data == NULL) {
 413                 return -ENOMEM;
 414         } else {
 415                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 416         }
 417         cifsFile = file->private_data;
 418         cifsFile->invalidHandle = TRUE;
 419         cifsFile->srch_inf.endOfSearch = FALSE;
 420
 421         if(file->f_dentry == NULL)
 422                 return -ENOENT;
 423
 424         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 425         if(cifs_sb == NULL)
 426                 return -EINVAL;
 427
 428         pTcon = cifs_sb->tcon;
 429         if(pTcon == NULL)
 430                 return -EINVAL;
 431
 432         full_path = build_path_from_dentry(file->f_dentry);
 433
 434         if(full_path == NULL) {
 435                 return -ENOMEM;
 436         }
 437
 438         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 439
 440 ffirst_retry:
 441         /* test for Unix extensions */
 442         if (pTcon->ses->capabilities & CAP_UNIX) {
 443                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 444         } else if ((pTcon->ses->capabilities &
 445                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 446                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 447         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 448                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 449         } else /* not srvinos - BB fixme add check for backlevel? */ {
 450                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 451         }
 452
 453         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 454                 &cifsFile->netfid, &cifsFile->srch_inf,
 455                 cifs_sb->mnt_cifs_flags &
 456                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 457         if(rc == 0)
 458                 cifsFile->invalidHandle = FALSE;
 459         if((rc == -EOPNOTSUPP) &&
 460                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 461                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 462                 goto ffirst_retry;
 463         }
 464         kfree(full_path);
 465         return rc;
 466 }
 467
 468 /* return length of unicode string in bytes */
 469 static int cifs_unicode_bytelen(char *str)
 470 {
 471         int len;
 472         __le16 * ustr = (__le16 *)str;
 473
 474         for(len=0;len <= PATH_MAX;len++) {
 475                 if(ustr[len] == 0)
 476                         return len << 1;
 477         }
 478         cFYI(1,("Unicode string longer than PATH_MAX found"));
 479         return len << 1;
 480 }
 481
 482 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 483 {
 484         char * new_entry;
 485         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 486
 487         if(level == SMB_FIND_FILE_INFO_STANDARD) {
 488                 FIND_FILE_STANDARD_INFO * pfData;
 489                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 490
 491                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 492                                 pfData->FileNameLength;
 493         } else
 494                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 495         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 496         /* validate that new_entry is not past end of SMB */
 497         if(new_entry >= end_of_smb) {
 498                 cERROR(1,
 499                       ("search entry %p began after end of SMB %p old entry %p",
 500                         new_entry, end_of_smb, old_entry));
 501                 return NULL;
 502         } else if(((level == SMB_FIND_FILE_INFO_STANDARD) &&
 503                    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
 504                   ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 505                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 506                 cERROR(1,("search entry %p extends after end of SMB %p",
 507                         new_entry, end_of_smb));
 508                 return NULL;
 509         } else
 510                 return new_entry;
 511
 512 }
 513
 514 #define UNICODE_DOT cpu_to_le16(0x2e)
 515
 516 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 517 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 518 {
 519         int rc = 0;
 520         char * filename = NULL;
 521         int len = 0;
 522
 523         if(cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 524                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 525                 filename = &pFindData->FileName[0];
 526                 if(cfile->srch_inf.unicode) {
 527                         len = cifs_unicode_bytelen(filename);
 528                 } else {
 529                         /* BB should we make this strnlen of PATH_MAX? */
 530                         len = strnlen(filename, 5);
 531                 }
 532         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 533                 FILE_DIRECTORY_INFO * pFindData =
 534                         (FILE_DIRECTORY_INFO *)current_entry;
 535                 filename = &pFindData->FileName[0];
 536                 len = le32_to_cpu(pFindData->FileNameLength);
 537         } else if(cfile->srch_inf.info_level ==
 538                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 539                 FILE_FULL_DIRECTORY_INFO * pFindData =
 540                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 541                 filename = &pFindData->FileName[0];
 542                 len = le32_to_cpu(pFindData->FileNameLength);
 543         } else if(cfile->srch_inf.info_level ==
 544                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 545                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 546                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 547                 filename = &pFindData->FileName[0];
 548                 len = le32_to_cpu(pFindData->FileNameLength);
 549         } else if(cfile->srch_inf.info_level ==
 550                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 551                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 552                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 553                 filename = &pFindData->FileName[0];
 554                 len = le32_to_cpu(pFindData->FileNameLength);
 555         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 556                 FIND_FILE_STANDARD_INFO * pFindData =
 557                         (FIND_FILE_STANDARD_INFO *)current_entry;
 558                 filename = &pFindData->FileName[0];
 559                 len = le32_to_cpu(pFindData->FileNameLength);
 560         } else {
 561                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 562         }
 563
 564         if(filename) {
 565                 if(cfile->srch_inf.unicode) {
 566                         __le16 *ufilename = (__le16 *)filename;
 567                         if(len == 2) {
 568                                 /* check for . */
 569                                 if(ufilename[0] == UNICODE_DOT)
 570                                         rc = 1;
 571                         } else if(len == 4) {
 572                                 /* check for .. */
 573                                 if((ufilename[0] == UNICODE_DOT)
 574                                    &&(ufilename[1] == UNICODE_DOT))
 575                                         rc = 2;
 576                         }
 577                 } else /* ASCII */ {
 578                         if(len == 1) {
 579                                 if(filename[0] == '.')
 580                                         rc = 1;
 581                         } else if(len == 2) {
 582                                 if((filename[0] == '.') && (filename[1] == '.'))
 583                                         rc = 2;
 584                         }
 585                 }
 586         }
 587
 588         return rc;
 589 }
 590
 591 /* Check if directory that we are searching has changed so we can decide
 592    whether we can use the cached search results from the previous search */
 593 static int is_dir_changed(struct file * file)
 594 {
 595         struct inode * inode;
 596         struct cifsInodeInfo *cifsInfo;
 597
 598         if(file->f_dentry == NULL)
 599                 return 0;
 600
 601         inode = file->f_dentry->d_inode;
 602
 603         if(inode == NULL)
 604                 return 0;
 605
 606         cifsInfo = CIFS_I(inode);
 607
 608         if(cifsInfo->time == 0)
 609                 return 1; /* directory was changed, perhaps due to unlink */
 610         else
 611                 return 0;
 612
 613 }
 614
 615 /* find the corresponding entry in the search */
 616 /* Note that the SMB server returns search entries for . and .. which
 617    complicates logic here if we choose to parse for them and we do not
 618    assume that they are located in the findfirst return buffer.*/
 619 /* We start counting in the buffer with entry 2 and increment for every
 620    entry (do not increment for . or .. entry) */
 621 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 622         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 623 {
 624         int rc = 0;
 625         int pos_in_buf = 0;
 626         loff_t first_entry_in_buffer;
 627         loff_t index_to_find = file->f_pos;
 628         struct cifsFileInfo * cifsFile = file->private_data;
 629         /* check if index in the buffer */
 630
 631         if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 632            (num_to_ret == NULL))
 633                 return -ENOENT;
 634
 635         *ppCurrentEntry = NULL;
 636         first_entry_in_buffer =
 637                 cifsFile->srch_inf.index_of_last_entry -
 638                         cifsFile->srch_inf.entries_in_buffer;
 639
 640         /* if first entry in buf is zero then is first buffer
 641         in search response data which means it is likely . and ..
 642         will be in this buffer, although some servers do not return
 643         . and .. for the root of a drive and for those we need
 644         to start two entries earlier */
 645
 646 #ifdef CONFIG_CIFS_DEBUG2
 647         dump_cifs_file_struct(file, "In fce ");
 648 #endif
 649         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 650              is_dir_changed(file)) ||
 651            (index_to_find < first_entry_in_buffer)) {
 652                 /* close and restart search */
 653                 cFYI(1,("search backing up - close and restart search"));
 654                 cifsFile->invalidHandle = TRUE;
 655                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 656                 kfree(cifsFile->search_resume_name);
 657                 cifsFile->search_resume_name = NULL;
 658                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 659                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 660                         if(cifsFile->srch_inf.smallBuf)
 661                                 cifs_small_buf_release(cifsFile->srch_inf.
 662                                                 ntwrk_buf_start);
 663                         else
 664                                 cifs_buf_release(cifsFile->srch_inf.
 665                                                 ntwrk_buf_start);
 666                 }
 667                 rc = initiate_cifs_search(xid,file);
 668                 if(rc) {
 669                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 670                         return rc;
 671                 }
 672         }
 673
 674         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 675               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 676                 cFYI(1,("calling findnext2"));
 677                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 678                                   &cifsFile->srch_inf);
 679                 if(rc)
 680                         return -ENOENT;
 681         }
 682         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 683                 /* we found the buffer that contains the entry */
 684                 /* scan and find it */
 685                 int i;
 686                 char * current_entry;
 687                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 688                         smbCalcSize((struct smb_hdr *)
 689                                 cifsFile->srch_inf.ntwrk_buf_start);
 690
 691                 current_entry = cifsFile->srch_inf.srch_entries_start;
 692                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 693                                         - cifsFile->srch_inf.entries_in_buffer;
 694                 pos_in_buf = index_to_find - first_entry_in_buffer;
 695                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 696
 697                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 698                         /* go entry by entry figuring out which is first */
 699                         current_entry = nxt_dir_entry(current_entry,end_of_smb,
 700                                                 cifsFile->srch_inf.info_level);
 701                 }
 702                 if((current_entry == NULL) && (i < pos_in_buf)) {
 703                         /* BB fixme - check if we should flag this error */
 704                         cERROR(1,("reached end of buf searching for pos in buf"
 705                           " %d index to find %lld rc %d",
 706                           pos_in_buf,index_to_find,rc));
 707                 }
 708                 rc = 0;
 709                 *ppCurrentEntry = current_entry;
 710         } else {
 711                 cFYI(1,("index not in buffer - could not findnext into it"));
 712                 return 0;
 713         }
 714
 715         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 716                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 717                 *num_to_ret = 0;
 718         } else
 719                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 720
 721         return rc;
 722 }
 723
 724 /* inode num, inode type and filename returned */
 725 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 726         char *current_entry, __u16 level, unsigned int unicode,
 727         struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
 728 {
 729         int rc = 0;
 730         unsigned int len = 0;
 731         char * filename;
 732         struct nls_table * nlt = cifs_sb->local_nls;
 733
 734         *pinum = 0;
 735
 736         if(level == SMB_FIND_FILE_UNIX) {
 737                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 738
 739                 filename = &pFindData->FileName[0];
 740                 if(unicode) {
 741                         len = cifs_unicode_bytelen(filename);
 742                 } else {
 743                         /* BB should we make this strnlen of PATH_MAX? */
 744                         len = strnlen(filename, PATH_MAX);
 745                 }
 746
 747                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 748                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 749                         *pinum = pFindData->UniqueId;
 750         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 751                 FILE_DIRECTORY_INFO * pFindData =
 752                         (FILE_DIRECTORY_INFO *)current_entry;
 753                 filename = &pFindData->FileName[0];
 754                 len = le32_to_cpu(pFindData->FileNameLength);
 755         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 756                 FILE_FULL_DIRECTORY_INFO * pFindData =
 757                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 758                 filename = &pFindData->FileName[0];
 759                 len = le32_to_cpu(pFindData->FileNameLength);
 760         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 761                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 762                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 763                 filename = &pFindData->FileName[0];
 764                 len = le32_to_cpu(pFindData->FileNameLength);
 765                 *pinum = pFindData->UniqueId;
 766         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 767                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 768                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 769                 filename = &pFindData->FileName[0];
 770                 len = le32_to_cpu(pFindData->FileNameLength);
 771         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 772                 FIND_FILE_STANDARD_INFO * pFindData =
 773                         (FIND_FILE_STANDARD_INFO *)current_entry;
 774                 filename = &pFindData->FileName[0];
 775                 /* one byte length, no name conversion */
 776                 len = (unsigned int)pFindData->FileNameLength;
 777         } else {
 778                 cFYI(1,("Unknown findfirst level %d",level));
 779                 return -EINVAL;
 780         }
 781
 782         if(len > max_len) {
 783                 cERROR(1,("bad search response length %d past smb end", len));
 784                 return -EINVAL;
 785         }
 786
 787         if(unicode) {
 788                 /* BB fixme - test with long names */
 789                 /* Note converted filename can be longer than in unicode */
 790                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 791                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 792                                         (__le16 *)filename, len/2, nlt);
 793                 else
 794                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 795                                         (__le16 *)filename,len/2,nlt);
 796         } else {
 797                 pqst->name = filename;
 798                 pqst->len = len;
 799         }
 800         pqst->hash = full_name_hash(pqst->name,pqst->len);
 801 /*      cFYI(1,("filldir on %s",pqst->name));  */
 802         return rc;
 803 }
 804
 805 static int cifs_filldir(char *pfindEntry, struct file *file,
 806         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 807 {
 808         int rc = 0;
 809         struct qstr qstring;
 810         struct cifsFileInfo * pCifsF;
 811         unsigned obj_type;
 812         ino_t  inum;
 813         struct cifs_sb_info * cifs_sb;
 814         struct inode *tmp_inode;
 815         struct dentry *tmp_dentry;
 816
 817         /* get filename and len into qstring */
 818         /* get dentry */
 819         /* decide whether to create and populate ionde */
 820         if((direntry == NULL) || (file == NULL))
 821                 return -EINVAL;
 822
 823         pCifsF = file->private_data;
 824
 825         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 826                 return -ENOENT;
 827
 828         if(file->f_dentry == NULL)
 829                 return -ENOENT;
 830
 831         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
 832         /* skip . and .. since we added them first */
 833         if(rc != 0)
 834                 return 0;
 835
 836         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 837
 838         qstring.name = scratch_buf;
 839         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 840                         pCifsF->srch_inf.info_level,
 841                         pCifsF->srch_inf.unicode,cifs_sb,
 842                         max_len,
 843                         &inum /* returned */);
 844
 845         if(rc)
 846                 return rc;
 847
 848         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 849         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 850                 return -ENOMEM;
 851
 852         if(rc) {
 853                 /* inode created, we need to hash it with right inode number */
 854                 if(inum != 0) {
 855                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 856                         tmp_inode->i_ino = inum;
 857                 }
 858                 insert_inode_hash(tmp_inode);
 859         }
 860
 861         /* we pass in rc below, indicating whether it is a new inode,
 862            so we can figure out whether to invalidate the inode cached
 863            data if the file has changed */
 864         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 865                 unix_fill_in_inode(tmp_inode,
 866                                    (FILE_UNIX_INFO *)pfindEntry,
 867                                    &obj_type, rc);
 868         else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 869                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 870                                 pfindEntry, &obj_type, rc);
 871         else
 872                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 873
 874
 875         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 876                      tmp_inode->i_ino,obj_type);
 877         if(rc) {
 878                 cFYI(1,("filldir rc = %d",rc));
 879         }
 880
 881         dput(tmp_dentry);
 882         return rc;
 883 }
 884
 885 static int cifs_save_resume_key(const char *current_entry,
 886         struct cifsFileInfo *cifsFile)
 887 {
 888         int rc = 0;
 889         unsigned int len = 0;
 890         __u16 level;
 891         char * filename;
 892
 893         if((cifsFile == NULL) || (current_entry == NULL))
 894                 return -EINVAL;
 895
 896         level = cifsFile->srch_inf.info_level;
 897
 898         if(level == SMB_FIND_FILE_UNIX) {
 899                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 900
 901                 filename = &pFindData->FileName[0];
 902                 if(cifsFile->srch_inf.unicode) {
 903                         len = cifs_unicode_bytelen(filename);
 904                 } else {
 905                         /* BB should we make this strnlen of PATH_MAX? */
 906                         len = strnlen(filename, PATH_MAX);
 907                 }
 908                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 909         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 910                 FILE_DIRECTORY_INFO * pFindData =
 911                         (FILE_DIRECTORY_INFO *)current_entry;
 912                 filename = &pFindData->FileName[0];
 913                 len = le32_to_cpu(pFindData->FileNameLength);
 914                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 915         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 916                 FILE_FULL_DIRECTORY_INFO * pFindData =
 917                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 918                 filename = &pFindData->FileName[0];
 919                 len = le32_to_cpu(pFindData->FileNameLength);
 920                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 921         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 922                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 923                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 924                 filename = &pFindData->FileName[0];
 925                 len = le32_to_cpu(pFindData->FileNameLength);
 926                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 927         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 928                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 929                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 930                 filename = &pFindData->FileName[0];
 931                 len = le32_to_cpu(pFindData->FileNameLength);
 932                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 933         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 934                 FIND_FILE_STANDARD_INFO * pFindData =
 935                         (FIND_FILE_STANDARD_INFO *)current_entry;
 936                 filename = &pFindData->FileName[0];
 937                 /* one byte length, no name conversion */
 938                 len = (unsigned int)pFindData->FileNameLength;
 939         } else {
 940                 cFYI(1,("Unknown findfirst level %d",level));
 941                 return -EINVAL;
 942         }
 943         cifsFile->srch_inf.resume_name_len = len;
 944         cifsFile->srch_inf.presume_name = filename;
 945         return rc;
 946 }
 947
 948 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 949 {
 950         int rc = 0;
 951         int xid,i;
 952         struct cifs_sb_info *cifs_sb;
 953         struct cifsTconInfo *pTcon;
 954         struct cifsFileInfo *cifsFile = NULL;
 955         char * current_entry;
 956         int num_to_fill = 0;
 957         char * tmp_buf = NULL;
 958         char * end_of_smb;
 959         int max_len;
 960
 961         xid = GetXid();
 962
 963         if(file->f_dentry == NULL) {
 964                 FreeXid(xid);
 965                 return -EIO;
 966         }
 967
 968         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 969         pTcon = cifs_sb->tcon;
 970         if(pTcon == NULL)
 971                 return -EINVAL;
 972
 973         switch ((int) file->f_pos) {
 974         case 0:
 975                 if (filldir(direntry, ".", 1, file->f_pos,
 976                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 977                         cERROR(1, ("Filldir for current dir failed"));
 978                         rc = -ENOMEM;
 979                         break;
 980                 }
 981                 file->f_pos++;
 982         case 1:
 983                 if (filldir(direntry, "..", 2, file->f_pos,
 984                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 985                         cERROR(1, ("Filldir for parent dir failed"));
 986                         rc = -ENOMEM;
 987                         break;
 988                 }
 989                 file->f_pos++;
 990         default:
 991                 /* 1) If search is active,
 992                         is in current search buffer?
 993                         if it before then restart search
 994                         if after then keep searching till find it */
 995
 996                 if(file->private_data == NULL) {
 997                         rc = initiate_cifs_search(xid,file);
 998                         cFYI(1,("initiate cifs search rc %d",rc));
 999                         if(rc) {
1000                                 FreeXid(xid);
1001                                 return rc;
1002                         }
1003                 }
1004                 if(file->private_data == NULL) {
1005                         rc = -EINVAL;
1006                         FreeXid(xid);
1007                         return rc;
1008                 }
1009                 cifsFile = file->private_data;
1010                 if (cifsFile->srch_inf.endOfSearch) {
1011                         if(cifsFile->srch_inf.emptyDir) {
1012                                 cFYI(1, ("End of search, empty dir"));
1013                                 rc = 0;
1014                                 break;
1015                         }
1016                 } /* else {
1017                         cifsFile->invalidHandle = TRUE;
1018                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1019                 }
1020                 kfree(cifsFile->search_resume_name);
1021                 cifsFile->search_resume_name = NULL; */
1022
1023                 rc = find_cifs_entry(xid,pTcon, file,
1024                                 &current_entry,&num_to_fill);
1025                 if(rc) {
1026                         cFYI(1,("fce error %d",rc));
1027                         goto rddir2_exit;
1028                 } else if (current_entry != NULL) {
1029                         cFYI(1,("entry %lld found",file->f_pos));
1030                 } else {
1031                         cFYI(1,("could not find entry"));
1032                         goto rddir2_exit;
1033                 }
1034                 cFYI(1,("loop through %d times filling dir for net buf %p",
1035                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1036                 max_len = smbCalcSize((struct smb_hdr *)
1037                                 cifsFile->srch_inf.ntwrk_buf_start);
1038                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1039
1040                 /* To be safe - for UCS to UTF-8 with strings loaded
1041                 with the rare long characters alloc more to account for
1042                 such multibyte target UTF-8 characters. cifs_unicode.c,
1043                 which actually does the conversion, has the same limit */
1044                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1045                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1046                         if(current_entry == NULL) {
1047                                 /* evaluate whether this case is an error */
1048                                 cERROR(1,("past end of SMB num to fill %d i %d",
1049                                           num_to_fill, i));
1050                                 break;
1051                         }
1052                         /* if buggy server returns . and .. late do
1053                         we want to check for that here? */
1054                         rc = cifs_filldir(current_entry, file,
1055                                         filldir, direntry, tmp_buf, max_len);
1056                         file->f_pos++;
1057                         if(file->f_pos ==
1058                                 cifsFile->srch_inf.index_of_last_entry) {
1059                                 cFYI(1,("last entry in buf at pos %lld %s",
1060                                         file->f_pos,tmp_buf));
1061                                 cifs_save_resume_key(current_entry,cifsFile);
1062                                 break;
1063                         } else
1064                                 current_entry =
1065                                         nxt_dir_entry(current_entry, end_of_smb,
1066                                                 cifsFile->srch_inf.info_level);
1067                 }
1068                 kfree(tmp_buf);
1069                 break;
1070         } /* end switch */
1071
1072 rddir2_exit:
1073         FreeXid(xid);
1074         return rc;
1075 }