err.no Git - linux-2.6/blob - 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                 }
  86         } else {
  87                 tmp_dentry = d_alloc(file->f_dentry, qstring);
  88                 if(tmp_dentry == NULL) {
  89                         cERROR(1,("Failed allocating dentry"));
  90                         *ptmp_inode = NULL;
  91                         return rc;
  92                 }
  93
  94                 *ptmp_inode = new_inode(file->f_dentry->d_sb);
  95                 if (pTcon->nocase)
  96                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
  97                 else
  98                         tmp_dentry->d_op = &cifs_dentry_ops;
  99                 if(*ptmp_inode == NULL)
 100                         return rc;
 101                 rc = 2;
 102         }
 103
 104         tmp_dentry->d_time = jiffies;
 105         *pnew_dentry = tmp_dentry;
 106         return rc;
 107 }
 108
 109 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
 110                 char * buf, int *pobject_type, int isNewInode)
 111 {
 112         loff_t local_size;
 113         struct timespec local_mtime;
 114
 115         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 116         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 117         __u32 attr;
 118         __u64 allocation_size;
 119         __u64 end_of_file;
 120
 121         /* save mtime and size */
 122         local_mtime = tmp_inode->i_mtime;
 123         local_size  = tmp_inode->i_size;
 124
 125         if(new_buf_type) {
 126                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
 127
 128                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 129                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 130                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 131                 tmp_inode->i_atime =
 132                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 133                 tmp_inode->i_mtime =
 134                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 135                 tmp_inode->i_ctime =
 136                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 137         } else { /* legacy, OS2 and DOS style */
 138                 FIND_FILE_STANDARD_INFO * pfindData =
 139                         (FIND_FILE_STANDARD_INFO *)buf;
 140
 141                 attr = le16_to_cpu(pfindData->Attributes);
 142                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
 143                 end_of_file = le32_to_cpu(pfindData->DataSize);
 144                 tmp_inode->i_atime = CURRENT_TIME;
 145                 /* tmp_inode->i_mtime =  BB FIXME - add dos time handling
 146                 tmp_inode->i_ctime = 0;   BB FIXME */
 147
 148         }
 149
 150         /* Linux can not store file creation time unfortunately so ignore it */
 151
 152         cifsInfo->cifsAttrs = attr;
 153         cifsInfo->time = jiffies;
 154
 155         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 156         /* 2767 perms - indicate mandatory locking */
 157                 /* BB fill in uid and gid here? with help from winbind?
 158                    or retrieve from NTFS stream extended attribute */
 159         if (atomic_read(&cifsInfo->inUse) == 0) {
 160                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 161                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 162                 /* set default mode. will override for dirs below */
 163                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 164         } else {
 165                 /* mask off the type bits since it gets set
 166                 below and we do not want to get two type
 167                 bits set */
 168                 tmp_inode->i_mode &= ~S_IFMT;
 169         }
 170
 171         if (attr & ATTR_DIRECTORY) {
 172                 *pobject_type = DT_DIR;
 173                 /* override default perms since we do not lock dirs */
 174                 if(atomic_read(&cifsInfo->inUse) == 0) {
 175                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 176                 }
 177                 tmp_inode->i_mode |= S_IFDIR;
 178         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 179                    (attr & ATTR_SYSTEM)) {
 180                 if (end_of_file == 0)  {
 181                         *pobject_type = DT_FIFO;
 182                         tmp_inode->i_mode |= S_IFIFO;
 183                 } else {
 184                         /* rather than get the type here, we mark the
 185                         inode as needing revalidate and get the real type
 186                         (blk vs chr vs. symlink) later ie in lookup */
 187                         *pobject_type = DT_REG;
 188                         tmp_inode->i_mode |= S_IFREG;
 189                         cifsInfo->time = 0;
 190                 }
 191 /* we no longer mark these because we could not follow them */
 192 /*        } else if (attr & ATTR_REPARSE) {
 193                 *pobject_type = DT_LNK;
 194                 tmp_inode->i_mode |= S_IFLNK; */
 195         } else {
 196                 *pobject_type = DT_REG;
 197                 tmp_inode->i_mode |= S_IFREG;
 198                 if (attr & ATTR_READONLY)
 199                         tmp_inode->i_mode &= ~(S_IWUGO);
 200         } /* could add code here - to validate if device or weird share type? */
 201
 202         /* can not fill in nlink here as in qpathinfo version and Unx search */
 203         if (atomic_read(&cifsInfo->inUse) == 0) {
 204                 atomic_set(&cifsInfo->inUse, 1);
 205         }
 206
 207         if (is_size_safe_to_change(cifsInfo)) {
 208                 /* can not safely change the file size here if the
 209                 client is writing to it due to potential races */
 210                 i_size_write(tmp_inode, end_of_file);
 211
 212         /* 512 bytes (2**9) is the fake blocksize that must be used */
 213         /* for this calculation, even though the reported blocksize is larger */
 214                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 215         }
 216
 217         if (allocation_size < end_of_file)
 218                 cFYI(1, ("May be sparse file, allocation less than file size"));
 219         cFYI(1, ("File Size %ld and blocks %llu",
 220                 (unsigned long)tmp_inode->i_size,
 221                 (unsigned long long)tmp_inode->i_blocks));
 222         if (S_ISREG(tmp_inode->i_mode)) {
 223                 cFYI(1, ("File inode"));
 224                 tmp_inode->i_op = &cifs_file_inode_ops;
 225                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 226                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 227                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 228                         else
 229                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 230
 231                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 232                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 233                 else
 234                         tmp_inode->i_fop = &cifs_file_ops;
 235
 236                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 237                    (cifs_sb->tcon->ses->server->maxBuf <
 238                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 239                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 240                 else
 241                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 242
 243                 if(isNewInode)
 244                         return; /* No sense invalidating pages for new inode
 245                                    since have not started caching readahead file
 246                                    data yet */
 247
 248                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 249                         (local_size == tmp_inode->i_size)) {
 250                         cFYI(1, ("inode exists but unchanged"));
 251                 } else {
 252                         /* file may have changed on server */
 253                         cFYI(1, ("invalidate inode, readdir detected change"));
 254                         invalidate_remote_inode(tmp_inode);
 255                 }
 256         } else if (S_ISDIR(tmp_inode->i_mode)) {
 257                 cFYI(1, ("Directory inode"));
 258                 tmp_inode->i_op = &cifs_dir_inode_ops;
 259                 tmp_inode->i_fop = &cifs_dir_ops;
 260         } else if (S_ISLNK(tmp_inode->i_mode)) {
 261                 cFYI(1, ("Symbolic Link inode"));
 262                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 263         } else {
 264                 cFYI(1, ("Init special inode"));
 265                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 266                                    tmp_inode->i_rdev);
 267         }
 268 }
 269
 270 static void unix_fill_in_inode(struct inode *tmp_inode,
 271         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 272 {
 273         loff_t local_size;
 274         struct timespec local_mtime;
 275
 276         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 277         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 278
 279         __u32 type = le32_to_cpu(pfindData->Type);
 280         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 281         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 282         cifsInfo->time = jiffies;
 283         atomic_inc(&cifsInfo->inUse);
 284
 285         /* save mtime and size */
 286         local_mtime = tmp_inode->i_mtime;
 287         local_size  = tmp_inode->i_size;
 288
 289         tmp_inode->i_atime =
 290             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 291         tmp_inode->i_mtime =
 292             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 293         tmp_inode->i_ctime =
 294             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 295
 296         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 297         /* since we set the inode type below we need to mask off type
 298            to avoid strange results if bits above were corrupt */
 299         tmp_inode->i_mode &= ~S_IFMT;
 300         if (type == UNIX_FILE) {
 301                 *pobject_type = DT_REG;
 302                 tmp_inode->i_mode |= S_IFREG;
 303         } else if (type == UNIX_SYMLINK) {
 304                 *pobject_type = DT_LNK;
 305                 tmp_inode->i_mode |= S_IFLNK;
 306         } else if (type == UNIX_DIR) {
 307                 *pobject_type = DT_DIR;
 308                 tmp_inode->i_mode |= S_IFDIR;
 309         } else if (type == UNIX_CHARDEV) {
 310                 *pobject_type = DT_CHR;
 311                 tmp_inode->i_mode |= S_IFCHR;
 312                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 313                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 314         } else if (type == UNIX_BLOCKDEV) {
 315                 *pobject_type = DT_BLK;
 316                 tmp_inode->i_mode |= S_IFBLK;
 317                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 318                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 319         } else if (type == UNIX_FIFO) {
 320                 *pobject_type = DT_FIFO;
 321                 tmp_inode->i_mode |= S_IFIFO;
 322         } else if (type == UNIX_SOCKET) {
 323                 *pobject_type = DT_SOCK;
 324                 tmp_inode->i_mode |= S_IFSOCK;
 325         } else {
 326                 /* safest to just call it a file */
 327                 *pobject_type = DT_REG;
 328                 tmp_inode->i_mode |= S_IFREG;
 329                 cFYI(1,("unknown inode type %d",type));
 330         }
 331
 332         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 333         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 334         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 335
 336         if (is_size_safe_to_change(cifsInfo)) {
 337                 /* can not safely change the file size here if the
 338                 client is writing to it due to potential races */
 339                 i_size_write(tmp_inode,end_of_file);
 340
 341         /* 512 bytes (2**9) is the fake blocksize that must be used */
 342         /* for this calculation, not the real blocksize */
 343                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 344         }
 345
 346         if (S_ISREG(tmp_inode->i_mode)) {
 347                 cFYI(1, ("File inode"));
 348                 tmp_inode->i_op = &cifs_file_inode_ops;
 349
 350                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 351                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 352                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 353                         else
 354                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 355
 356                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 357                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 358                 else
 359                         tmp_inode->i_fop = &cifs_file_ops;
 360
 361                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 362                    (cifs_sb->tcon->ses->server->maxBuf <
 363                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 364                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 365                 else
 366                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 367
 368                 if(isNewInode)
 369                         return; /* No sense invalidating pages for new inode since we
 370                                            have not started caching readahead file data yet */
 371
 372                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 373                         (local_size == tmp_inode->i_size)) {
 374                         cFYI(1, ("inode exists but unchanged"));
 375                 } else {
 376                         /* file may have changed on server */
 377                         cFYI(1, ("invalidate inode, readdir detected change"));
 378                         invalidate_remote_inode(tmp_inode);
 379                 }
 380         } else if (S_ISDIR(tmp_inode->i_mode)) {
 381                 cFYI(1, ("Directory inode"));
 382                 tmp_inode->i_op = &cifs_dir_inode_ops;
 383                 tmp_inode->i_fop = &cifs_dir_ops;
 384         } else if (S_ISLNK(tmp_inode->i_mode)) {
 385                 cFYI(1, ("Symbolic Link inode"));
 386                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 387 /* tmp_inode->i_fop = *//* do not need to set to anything */
 388         } else {
 389                 cFYI(1, ("Special inode"));
 390                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 391                                    tmp_inode->i_rdev);
 392         }
 393 }
 394
 395 static int initiate_cifs_search(const int xid, struct file *file)
 396 {
 397         int rc = 0;
 398         char * full_path;
 399         struct cifsFileInfo * cifsFile;
 400         struct cifs_sb_info *cifs_sb;
 401         struct cifsTconInfo *pTcon;
 402
 403         if(file->private_data == NULL) {
 404                 file->private_data =
 405                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 406         }
 407
 408         if(file->private_data == NULL) {
 409                 return -ENOMEM;
 410         } else {
 411                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 412         }
 413         cifsFile = file->private_data;
 414         cifsFile->invalidHandle = TRUE;
 415         cifsFile->srch_inf.endOfSearch = FALSE;
 416
 417         if(file->f_dentry == NULL)
 418                 return -ENOENT;
 419
 420         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 421         if(cifs_sb == NULL)
 422                 return -EINVAL;
 423
 424         pTcon = cifs_sb->tcon;
 425         if(pTcon == NULL)
 426                 return -EINVAL;
 427
 428         full_path = build_path_from_dentry(file->f_dentry);
 429
 430         if(full_path == NULL) {
 431                 return -ENOMEM;
 432         }
 433
 434         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 435
 436 ffirst_retry:
 437         /* test for Unix extensions */
 438         if (pTcon->ses->capabilities & CAP_UNIX) {
 439                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 440         } else if ((pTcon->ses->capabilities &
 441                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 442                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 443         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 444                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 445         } else /* not srvinos - BB fixme add check for backlevel? */ {
 446                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 447         }
 448
 449         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 450                 &cifsFile->netfid, &cifsFile->srch_inf,
 451                 cifs_sb->mnt_cifs_flags &
 452                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 453         if(rc == 0)
 454                 cifsFile->invalidHandle = FALSE;
 455         if((rc == -EOPNOTSUPP) &&
 456                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 457                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 458                 goto ffirst_retry;
 459         }
 460         kfree(full_path);
 461         return rc;
 462 }
 463
 464 /* return length of unicode string in bytes */
 465 static int cifs_unicode_bytelen(char *str)
 466 {
 467         int len;
 468         __le16 * ustr = (__le16 *)str;
 469
 470         for(len=0;len <= PATH_MAX;len++) {
 471                 if(ustr[len] == 0)
 472                         return len << 1;
 473         }
 474         cFYI(1,("Unicode string longer than PATH_MAX found"));
 475         return len << 1;
 476 }
 477
 478 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 479 {
 480         char * new_entry;
 481         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 482
 483         if(level == SMB_FIND_FILE_INFO_STANDARD) {
 484                 FIND_FILE_STANDARD_INFO * pfData;
 485                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 486
 487                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 488                                 pfData->FileNameLength;
 489         } else
 490                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 491         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 492         /* validate that new_entry is not past end of SMB */
 493         if(new_entry >= end_of_smb) {
 494                 cERROR(1,
 495                       ("search entry %p began after end of SMB %p old entry %p",
 496                         new_entry, end_of_smb, old_entry));
 497                 return NULL;
 498         } else if(((level == SMB_FIND_FILE_INFO_STANDARD) &&
 499                    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
 500                   ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 501                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 502                 cERROR(1,("search entry %p extends after end of SMB %p",
 503                         new_entry, end_of_smb));
 504                 return NULL;
 505         } else
 506                 return new_entry;
 507
 508 }
 509
 510 #define UNICODE_DOT cpu_to_le16(0x2e)
 511
 512 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 513 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 514 {
 515         int rc = 0;
 516         char * filename = NULL;
 517         int len = 0;
 518
 519         if(cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 520                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 521                 filename = &pFindData->FileName[0];
 522                 if(cfile->srch_inf.unicode) {
 523                         len = cifs_unicode_bytelen(filename);
 524                 } else {
 525                         /* BB should we make this strnlen of PATH_MAX? */
 526                         len = strnlen(filename, 5);
 527                 }
 528         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 529                 FILE_DIRECTORY_INFO * pFindData =
 530                         (FILE_DIRECTORY_INFO *)current_entry;
 531                 filename = &pFindData->FileName[0];
 532                 len = le32_to_cpu(pFindData->FileNameLength);
 533         } else if(cfile->srch_inf.info_level ==
 534                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 535                 FILE_FULL_DIRECTORY_INFO * pFindData =
 536                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 537                 filename = &pFindData->FileName[0];
 538                 len = le32_to_cpu(pFindData->FileNameLength);
 539         } else if(cfile->srch_inf.info_level ==
 540                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 541                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 542                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 543                 filename = &pFindData->FileName[0];
 544                 len = le32_to_cpu(pFindData->FileNameLength);
 545         } else if(cfile->srch_inf.info_level ==
 546                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 547                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 548                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 549                 filename = &pFindData->FileName[0];
 550                 len = le32_to_cpu(pFindData->FileNameLength);
 551         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 552                 FIND_FILE_STANDARD_INFO * pFindData =
 553                         (FIND_FILE_STANDARD_INFO *)current_entry;
 554                 filename = &pFindData->FileName[0];
 555                 len = pFindData->FileNameLength;
 556         } else {
 557                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 558         }
 559
 560         if(filename) {
 561                 if(cfile->srch_inf.unicode) {
 562                         __le16 *ufilename = (__le16 *)filename;
 563                         if(len == 2) {
 564                                 /* check for . */
 565                                 if(ufilename[0] == UNICODE_DOT)
 566                                         rc = 1;
 567                         } else if(len == 4) {
 568                                 /* check for .. */
 569                                 if((ufilename[0] == UNICODE_DOT)
 570                                    &&(ufilename[1] == UNICODE_DOT))
 571                                         rc = 2;
 572                         }
 573                 } else /* ASCII */ {
 574                         if(len == 1) {
 575                                 if(filename[0] == '.')
 576                                         rc = 1;
 577                         } else if(len == 2) {
 578                                 if((filename[0] == '.') && (filename[1] == '.'))
 579                                         rc = 2;
 580                         }
 581                 }
 582         }
 583
 584         return rc;
 585 }
 586
 587 /* Check if directory that we are searching has changed so we can decide
 588    whether we can use the cached search results from the previous search */
 589 static int is_dir_changed(struct file * file)
 590 {
 591         struct inode * inode;
 592         struct cifsInodeInfo *cifsInfo;
 593
 594         if(file->f_dentry == NULL)
 595                 return 0;
 596
 597         inode = file->f_dentry->d_inode;
 598
 599         if(inode == NULL)
 600                 return 0;
 601
 602         cifsInfo = CIFS_I(inode);
 603
 604         if(cifsInfo->time == 0)
 605                 return 1; /* directory was changed, perhaps due to unlink */
 606         else
 607                 return 0;
 608
 609 }
 610
 611 /* find the corresponding entry in the search */
 612 /* Note that the SMB server returns search entries for . and .. which
 613    complicates logic here if we choose to parse for them and we do not
 614    assume that they are located in the findfirst return buffer.*/
 615 /* We start counting in the buffer with entry 2 and increment for every
 616    entry (do not increment for . or .. entry) */
 617 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 618         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 619 {
 620         int rc = 0;
 621         int pos_in_buf = 0;
 622         loff_t first_entry_in_buffer;
 623         loff_t index_to_find = file->f_pos;
 624         struct cifsFileInfo * cifsFile = file->private_data;
 625         /* check if index in the buffer */
 626
 627         if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 628            (num_to_ret == NULL))
 629                 return -ENOENT;
 630
 631         *ppCurrentEntry = NULL;
 632         first_entry_in_buffer =
 633                 cifsFile->srch_inf.index_of_last_entry -
 634                         cifsFile->srch_inf.entries_in_buffer;
 635
 636         /* if first entry in buf is zero then is first buffer
 637         in search response data which means it is likely . and ..
 638         will be in this buffer, although some servers do not return
 639         . and .. for the root of a drive and for those we need
 640         to start two entries earlier */
 641
 642 #ifdef CONFIG_CIFS_DEBUG2
 643         dump_cifs_file_struct(file, "In fce ");
 644 #endif
 645         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 646              is_dir_changed(file)) ||
 647            (index_to_find < first_entry_in_buffer)) {
 648                 /* close and restart search */
 649                 cFYI(1,("search backing up - close and restart search"));
 650                 cifsFile->invalidHandle = TRUE;
 651                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 652                 kfree(cifsFile->search_resume_name);
 653                 cifsFile->search_resume_name = NULL;
 654                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 655                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 656                         if(cifsFile->srch_inf.smallBuf)
 657                                 cifs_small_buf_release(cifsFile->srch_inf.
 658                                                 ntwrk_buf_start);
 659                         else
 660                                 cifs_buf_release(cifsFile->srch_inf.
 661                                                 ntwrk_buf_start);
 662                 }
 663                 rc = initiate_cifs_search(xid,file);
 664                 if(rc) {
 665                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 666                         return rc;
 667                 }
 668         }
 669
 670         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 671               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 672                 cFYI(1,("calling findnext2"));
 673                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 674                                   &cifsFile->srch_inf);
 675                 if(rc)
 676                         return -ENOENT;
 677         }
 678         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 679                 /* we found the buffer that contains the entry */
 680                 /* scan and find it */
 681                 int i;
 682                 char * current_entry;
 683                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 684                         smbCalcSize((struct smb_hdr *)
 685                                 cifsFile->srch_inf.ntwrk_buf_start);
 686
 687                 current_entry = cifsFile->srch_inf.srch_entries_start;
 688                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 689                                         - cifsFile->srch_inf.entries_in_buffer;
 690                 pos_in_buf = index_to_find - first_entry_in_buffer;
 691                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 692
 693                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 694                         /* go entry by entry figuring out which is first */
 695                         current_entry = nxt_dir_entry(current_entry,end_of_smb,
 696                                                 cifsFile->srch_inf.info_level);
 697                 }
 698                 if((current_entry == NULL) && (i < pos_in_buf)) {
 699                         /* BB fixme - check if we should flag this error */
 700                         cERROR(1,("reached end of buf searching for pos in buf"
 701                           " %d index to find %lld rc %d",
 702                           pos_in_buf,index_to_find,rc));
 703                 }
 704                 rc = 0;
 705                 *ppCurrentEntry = current_entry;
 706         } else {
 707                 cFYI(1,("index not in buffer - could not findnext into it"));
 708                 return 0;
 709         }
 710
 711         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 712                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 713                 *num_to_ret = 0;
 714         } else
 715                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 716
 717         return rc;
 718 }
 719
 720 /* inode num, inode type and filename returned */
 721 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 722         char *current_entry, __u16 level, unsigned int unicode,
 723         struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
 724 {
 725         int rc = 0;
 726         unsigned int len = 0;
 727         char * filename;
 728         struct nls_table * nlt = cifs_sb->local_nls;
 729
 730         *pinum = 0;
 731
 732         if(level == SMB_FIND_FILE_UNIX) {
 733                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 734
 735                 filename = &pFindData->FileName[0];
 736                 if(unicode) {
 737                         len = cifs_unicode_bytelen(filename);
 738                 } else {
 739                         /* BB should we make this strnlen of PATH_MAX? */
 740                         len = strnlen(filename, PATH_MAX);
 741                 }
 742
 743                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 744                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 745                         *pinum = pFindData->UniqueId;
 746         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 747                 FILE_DIRECTORY_INFO * pFindData =
 748                         (FILE_DIRECTORY_INFO *)current_entry;
 749                 filename = &pFindData->FileName[0];
 750                 len = le32_to_cpu(pFindData->FileNameLength);
 751         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 752                 FILE_FULL_DIRECTORY_INFO * pFindData =
 753                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 754                 filename = &pFindData->FileName[0];
 755                 len = le32_to_cpu(pFindData->FileNameLength);
 756         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 757                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 758                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 759                 filename = &pFindData->FileName[0];
 760                 len = le32_to_cpu(pFindData->FileNameLength);
 761                 *pinum = pFindData->UniqueId;
 762         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 763                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 764                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 765                 filename = &pFindData->FileName[0];
 766                 len = le32_to_cpu(pFindData->FileNameLength);
 767         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 768                 FIND_FILE_STANDARD_INFO * pFindData =
 769                         (FIND_FILE_STANDARD_INFO *)current_entry;
 770                 filename = &pFindData->FileName[0];
 771                 /* one byte length, no name conversion */
 772                 len = (unsigned int)pFindData->FileNameLength;
 773         } else {
 774                 cFYI(1,("Unknown findfirst level %d",level));
 775                 return -EINVAL;
 776         }
 777
 778         if(len > max_len) {
 779                 cERROR(1,("bad search response length %d past smb end", len));
 780                 return -EINVAL;
 781         }
 782
 783         if(unicode) {
 784                 /* BB fixme - test with long names */
 785                 /* Note converted filename can be longer than in unicode */
 786                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 787                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 788                                         (__le16 *)filename, len/2, nlt);
 789                 else
 790                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 791                                         (__le16 *)filename,len/2,nlt);
 792         } else {
 793                 pqst->name = filename;
 794                 pqst->len = len;
 795         }
 796         pqst->hash = full_name_hash(pqst->name,pqst->len);
 797 /*      cFYI(1,("filldir on %s",pqst->name));  */
 798         return rc;
 799 }
 800
 801 static int cifs_filldir(char *pfindEntry, struct file *file,
 802         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 803 {
 804         int rc = 0;
 805         struct qstr qstring;
 806         struct cifsFileInfo * pCifsF;
 807         unsigned obj_type;
 808         ino_t  inum;
 809         struct cifs_sb_info * cifs_sb;
 810         struct inode *tmp_inode;
 811         struct dentry *tmp_dentry;
 812
 813         /* get filename and len into qstring */
 814         /* get dentry */
 815         /* decide whether to create and populate ionde */
 816         if((direntry == NULL) || (file == NULL))
 817                 return -EINVAL;
 818
 819         pCifsF = file->private_data;
 820
 821         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 822                 return -ENOENT;
 823
 824         if(file->f_dentry == NULL)
 825                 return -ENOENT;
 826
 827         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
 828         /* skip . and .. since we added them first */
 829         if(rc != 0)
 830                 return 0;
 831
 832         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 833
 834         qstring.name = scratch_buf;
 835         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 836                         pCifsF->srch_inf.info_level,
 837                         pCifsF->srch_inf.unicode,cifs_sb,
 838                         max_len,
 839                         &inum /* returned */);
 840
 841         if(rc)
 842                 return rc;
 843
 844         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 845         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 846                 return -ENOMEM;
 847
 848         if(rc) {
 849                 /* inode created, we need to hash it with right inode number */
 850                 if(inum != 0) {
 851                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 852                         tmp_inode->i_ino = inum;
 853                 }
 854                 insert_inode_hash(tmp_inode);
 855         }
 856
 857         /* we pass in rc below, indicating whether it is a new inode,
 858            so we can figure out whether to invalidate the inode cached
 859            data if the file has changed */
 860         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 861                 unix_fill_in_inode(tmp_inode,
 862                                    (FILE_UNIX_INFO *)pfindEntry,
 863                                    &obj_type, rc);
 864         else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 865                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 866                                 pfindEntry, &obj_type, rc);
 867         else
 868                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 869
 870         if(rc) /* new inode - needs to be tied to dentry */ {
 871                 d_instantiate(tmp_dentry, tmp_inode);
 872                 if(rc == 2)
 873                         d_rehash(tmp_dentry);
 874         }
 875
 876
 877         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 878                      tmp_inode->i_ino,obj_type);
 879         if(rc) {
 880                 cFYI(1,("filldir rc = %d",rc));
 881         }
 882
 883         dput(tmp_dentry);
 884         return rc;
 885 }
 886
 887 static int cifs_save_resume_key(const char *current_entry,
 888         struct cifsFileInfo *cifsFile)
 889 {
 890         int rc = 0;
 891         unsigned int len = 0;
 892         __u16 level;
 893         char * filename;
 894
 895         if((cifsFile == NULL) || (current_entry == NULL))
 896                 return -EINVAL;
 897
 898         level = cifsFile->srch_inf.info_level;
 899
 900         if(level == SMB_FIND_FILE_UNIX) {
 901                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 902
 903                 filename = &pFindData->FileName[0];
 904                 if(cifsFile->srch_inf.unicode) {
 905                         len = cifs_unicode_bytelen(filename);
 906                 } else {
 907                         /* BB should we make this strnlen of PATH_MAX? */
 908                         len = strnlen(filename, PATH_MAX);
 909                 }
 910                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 911         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 912                 FILE_DIRECTORY_INFO * pFindData =
 913                         (FILE_DIRECTORY_INFO *)current_entry;
 914                 filename = &pFindData->FileName[0];
 915                 len = le32_to_cpu(pFindData->FileNameLength);
 916                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 917         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 918                 FILE_FULL_DIRECTORY_INFO * pFindData =
 919                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 920                 filename = &pFindData->FileName[0];
 921                 len = le32_to_cpu(pFindData->FileNameLength);
 922                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 923         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 924                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 925                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 926                 filename = &pFindData->FileName[0];
 927                 len = le32_to_cpu(pFindData->FileNameLength);
 928                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 929         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 930                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 931                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 932                 filename = &pFindData->FileName[0];
 933                 len = le32_to_cpu(pFindData->FileNameLength);
 934                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 935         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 936                 FIND_FILE_STANDARD_INFO * pFindData =
 937                         (FIND_FILE_STANDARD_INFO *)current_entry;
 938                 filename = &pFindData->FileName[0];
 939                 /* one byte length, no name conversion */
 940                 len = (unsigned int)pFindData->FileNameLength;
 941         } else {
 942                 cFYI(1,("Unknown findfirst level %d",level));
 943                 return -EINVAL;
 944         }
 945         cifsFile->srch_inf.resume_name_len = len;
 946         cifsFile->srch_inf.presume_name = filename;
 947         return rc;
 948 }
 949
 950 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 951 {
 952         int rc = 0;
 953         int xid,i;
 954         struct cifs_sb_info *cifs_sb;
 955         struct cifsTconInfo *pTcon;
 956         struct cifsFileInfo *cifsFile = NULL;
 957         char * current_entry;
 958         int num_to_fill = 0;
 959         char * tmp_buf = NULL;
 960         char * end_of_smb;
 961         int max_len;
 962
 963         xid = GetXid();
 964
 965         if(file->f_dentry == NULL) {
 966                 FreeXid(xid);
 967                 return -EIO;
 968         }
 969
 970         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 971         pTcon = cifs_sb->tcon;
 972         if(pTcon == NULL)
 973                 return -EINVAL;
 974
 975         switch ((int) file->f_pos) {
 976         case 0:
 977                 if (filldir(direntry, ".", 1, file->f_pos,
 978                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 979                         cERROR(1, ("Filldir for current dir failed"));
 980                         rc = -ENOMEM;
 981                         break;
 982                 }
 983                 file->f_pos++;
 984         case 1:
 985                 if (filldir(direntry, "..", 2, file->f_pos,
 986                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 987                         cERROR(1, ("Filldir for parent dir failed"));
 988                         rc = -ENOMEM;
 989                         break;
 990                 }
 991                 file->f_pos++;
 992         default:
 993                 /* 1) If search is active,
 994                         is in current search buffer?
 995                         if it before then restart search
 996                         if after then keep searching till find it */
 997
 998                 if(file->private_data == NULL) {
 999                         rc = initiate_cifs_search(xid,file);
1000                         cFYI(1,("initiate cifs search rc %d",rc));
1001                         if(rc) {
1002                                 FreeXid(xid);
1003                                 return rc;
1004                         }
1005                 }
1006                 if(file->private_data == NULL) {
1007                         rc = -EINVAL;
1008                         FreeXid(xid);
1009                         return rc;
1010                 }
1011                 cifsFile = file->private_data;
1012                 if (cifsFile->srch_inf.endOfSearch) {
1013                         if(cifsFile->srch_inf.emptyDir) {
1014                                 cFYI(1, ("End of search, empty dir"));
1015                                 rc = 0;
1016                                 break;
1017                         }
1018                 } /* else {
1019                         cifsFile->invalidHandle = TRUE;
1020                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1021                 }
1022                 kfree(cifsFile->search_resume_name);
1023                 cifsFile->search_resume_name = NULL; */
1024
1025                 rc = find_cifs_entry(xid,pTcon, file,
1026                                 &current_entry,&num_to_fill);
1027                 if(rc) {
1028                         cFYI(1,("fce error %d",rc));
1029                         goto rddir2_exit;
1030                 } else if (current_entry != NULL) {
1031                         cFYI(1,("entry %lld found",file->f_pos));
1032                 } else {
1033                         cFYI(1,("could not find entry"));
1034                         goto rddir2_exit;
1035                 }
1036                 cFYI(1,("loop through %d times filling dir for net buf %p",
1037                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1038                 max_len = smbCalcSize((struct smb_hdr *)
1039                                 cifsFile->srch_inf.ntwrk_buf_start);
1040                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1041
1042                 /* To be safe - for UCS to UTF-8 with strings loaded
1043                 with the rare long characters alloc more to account for
1044                 such multibyte target UTF-8 characters. cifs_unicode.c,
1045                 which actually does the conversion, has the same limit */
1046                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1047                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1048                         if(current_entry == NULL) {
1049                                 /* evaluate whether this case is an error */
1050                                 cERROR(1,("past end of SMB num to fill %d i %d",
1051                                           num_to_fill, i));
1052                                 break;
1053                         }
1054                         /* if buggy server returns . and .. late do
1055                         we want to check for that here? */
1056                         rc = cifs_filldir(current_entry, file,
1057                                         filldir, direntry, tmp_buf, max_len);
1058                         file->f_pos++;
1059                         if(file->f_pos ==
1060                                 cifsFile->srch_inf.index_of_last_entry) {
1061                                 cFYI(1,("last entry in buf at pos %lld %s",
1062                                         file->f_pos,tmp_buf));
1063                                 cifs_save_resume_key(current_entry,cifsFile);
1064                                 break;
1065                         } else
1066                                 current_entry =
1067                                         nxt_dir_entry(current_entry, end_of_smb,
1068                                                 cifsFile->srch_inf.info_level);
1069                 }
1070                 kfree(tmp_buf);
1071                 break;
1072         } /* end switch */
1073
1074 rddir2_exit:
1075         FreeXid(xid);
1076         return rc;
1077 }