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 and blocksize %ld",
 220                 (unsigned long)tmp_inode->i_size,
 221                 (unsigned long long)tmp_inode->i_blocks,
 222                 tmp_inode->i_blksize));
 223         if (S_ISREG(tmp_inode->i_mode)) {
 224                 cFYI(1, ("File inode"));
 225                 tmp_inode->i_op = &cifs_file_inode_ops;
 226                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 227                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 228                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 229                         else
 230                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 231
 232                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 233                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 234                 else
 235                         tmp_inode->i_fop = &cifs_file_ops;
 236
 237                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 238                    (cifs_sb->tcon->ses->server->maxBuf <
 239                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 240                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 241                 else
 242                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 243
 244                 if(isNewInode)
 245                         return; /* No sense invalidating pages for new inode
 246                                    since have not started caching readahead file
 247                                    data yet */
 248
 249                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 250                         (local_size == tmp_inode->i_size)) {
 251                         cFYI(1, ("inode exists but unchanged"));
 252                 } else {
 253                         /* file may have changed on server */
 254                         cFYI(1, ("invalidate inode, readdir detected change"));
 255                         invalidate_remote_inode(tmp_inode);
 256                 }
 257         } else if (S_ISDIR(tmp_inode->i_mode)) {
 258                 cFYI(1, ("Directory inode"));
 259                 tmp_inode->i_op = &cifs_dir_inode_ops;
 260                 tmp_inode->i_fop = &cifs_dir_ops;
 261         } else if (S_ISLNK(tmp_inode->i_mode)) {
 262                 cFYI(1, ("Symbolic Link inode"));
 263                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 264         } else {
 265                 cFYI(1, ("Init special inode"));
 266                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 267                                    tmp_inode->i_rdev);
 268         }
 269 }
 270
 271 static void unix_fill_in_inode(struct inode *tmp_inode,
 272         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 273 {
 274         loff_t local_size;
 275         struct timespec local_mtime;
 276
 277         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 278         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 279
 280         __u32 type = le32_to_cpu(pfindData->Type);
 281         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 282         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 283         cifsInfo->time = jiffies;
 284         atomic_inc(&cifsInfo->inUse);
 285
 286         /* save mtime and size */
 287         local_mtime = tmp_inode->i_mtime;
 288         local_size  = tmp_inode->i_size;
 289
 290         tmp_inode->i_atime =
 291             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 292         tmp_inode->i_mtime =
 293             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 294         tmp_inode->i_ctime =
 295             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 296
 297         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 298         /* since we set the inode type below we need to mask off type
 299            to avoid strange results if bits above were corrupt */
 300         tmp_inode->i_mode &= ~S_IFMT;
 301         if (type == UNIX_FILE) {
 302                 *pobject_type = DT_REG;
 303                 tmp_inode->i_mode |= S_IFREG;
 304         } else if (type == UNIX_SYMLINK) {
 305                 *pobject_type = DT_LNK;
 306                 tmp_inode->i_mode |= S_IFLNK;
 307         } else if (type == UNIX_DIR) {
 308                 *pobject_type = DT_DIR;
 309                 tmp_inode->i_mode |= S_IFDIR;
 310         } else if (type == UNIX_CHARDEV) {
 311                 *pobject_type = DT_CHR;
 312                 tmp_inode->i_mode |= S_IFCHR;
 313                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 314                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 315         } else if (type == UNIX_BLOCKDEV) {
 316                 *pobject_type = DT_BLK;
 317                 tmp_inode->i_mode |= S_IFBLK;
 318                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 319                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 320         } else if (type == UNIX_FIFO) {
 321                 *pobject_type = DT_FIFO;
 322                 tmp_inode->i_mode |= S_IFIFO;
 323         } else if (type == UNIX_SOCKET) {
 324                 *pobject_type = DT_SOCK;
 325                 tmp_inode->i_mode |= S_IFSOCK;
 326         } else {
 327                 /* safest to just call it a file */
 328                 *pobject_type = DT_REG;
 329                 tmp_inode->i_mode |= S_IFREG;
 330                 cFYI(1,("unknown inode type %d",type));
 331         }
 332
 333         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 334         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 335         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 336
 337         if (is_size_safe_to_change(cifsInfo)) {
 338                 /* can not safely change the file size here if the
 339                 client is writing to it due to potential races */
 340                 i_size_write(tmp_inode,end_of_file);
 341
 342         /* 512 bytes (2**9) is the fake blocksize that must be used */
 343         /* for this calculation, not the real blocksize */
 344                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 345         }
 346
 347         if (S_ISREG(tmp_inode->i_mode)) {
 348                 cFYI(1, ("File inode"));
 349                 tmp_inode->i_op = &cifs_file_inode_ops;
 350
 351                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 352                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 353                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 354                         else
 355                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 356
 357                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 358                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 359                 else
 360                         tmp_inode->i_fop = &cifs_file_ops;
 361
 362                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 363                    (cifs_sb->tcon->ses->server->maxBuf <
 364                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 365                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 366                 else
 367                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 368
 369                 if(isNewInode)
 370                         return; /* No sense invalidating pages for new inode since we
 371                                            have not started caching readahead file data yet */
 372
 373                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 374                         (local_size == tmp_inode->i_size)) {
 375                         cFYI(1, ("inode exists but unchanged"));
 376                 } else {
 377                         /* file may have changed on server */
 378                         cFYI(1, ("invalidate inode, readdir detected change"));
 379                         invalidate_remote_inode(tmp_inode);
 380                 }
 381         } else if (S_ISDIR(tmp_inode->i_mode)) {
 382                 cFYI(1, ("Directory inode"));
 383                 tmp_inode->i_op = &cifs_dir_inode_ops;
 384                 tmp_inode->i_fop = &cifs_dir_ops;
 385         } else if (S_ISLNK(tmp_inode->i_mode)) {
 386                 cFYI(1, ("Symbolic Link inode"));
 387                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 388 /* tmp_inode->i_fop = *//* do not need to set to anything */
 389         } else {
 390                 cFYI(1, ("Special inode"));
 391                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 392                                    tmp_inode->i_rdev);
 393         }
 394 }
 395
 396 static int initiate_cifs_search(const int xid, struct file *file)
 397 {
 398         int rc = 0;
 399         char * full_path;
 400         struct cifsFileInfo * cifsFile;
 401         struct cifs_sb_info *cifs_sb;
 402         struct cifsTconInfo *pTcon;
 403
 404         if(file->private_data == NULL) {
 405                 file->private_data =
 406                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 407         }
 408
 409         if(file->private_data == NULL) {
 410                 return -ENOMEM;
 411         } else {
 412                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 413         }
 414         cifsFile = file->private_data;
 415         cifsFile->invalidHandle = TRUE;
 416         cifsFile->srch_inf.endOfSearch = FALSE;
 417
 418         if(file->f_dentry == NULL)
 419                 return -ENOENT;
 420
 421         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 422         if(cifs_sb == NULL)
 423                 return -EINVAL;
 424
 425         pTcon = cifs_sb->tcon;
 426         if(pTcon == NULL)
 427                 return -EINVAL;
 428
 429         full_path = build_path_from_dentry(file->f_dentry);
 430
 431         if(full_path == NULL) {
 432                 return -ENOMEM;
 433         }
 434
 435         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 436
 437 ffirst_retry:
 438         /* test for Unix extensions */
 439         if (pTcon->ses->capabilities & CAP_UNIX) {
 440                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 441         } else if ((pTcon->ses->capabilities &
 442                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 443                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 444         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 445                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 446         } else /* not srvinos - BB fixme add check for backlevel? */ {
 447                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 448         }
 449
 450         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 451                 &cifsFile->netfid, &cifsFile->srch_inf,
 452                 cifs_sb->mnt_cifs_flags &
 453                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 454         if(rc == 0)
 455                 cifsFile->invalidHandle = FALSE;
 456         if((rc == -EOPNOTSUPP) &&
 457                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 458                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 459                 goto ffirst_retry;
 460         }
 461         kfree(full_path);
 462         return rc;
 463 }
 464
 465 /* return length of unicode string in bytes */
 466 static int cifs_unicode_bytelen(char *str)
 467 {
 468         int len;
 469         __le16 * ustr = (__le16 *)str;
 470
 471         for(len=0;len <= PATH_MAX;len++) {
 472                 if(ustr[len] == 0)
 473                         return len << 1;
 474         }
 475         cFYI(1,("Unicode string longer than PATH_MAX found"));
 476         return len << 1;
 477 }
 478
 479 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 480 {
 481         char * new_entry;
 482         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 483
 484         if(level == SMB_FIND_FILE_INFO_STANDARD) {
 485                 FIND_FILE_STANDARD_INFO * pfData;
 486                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 487
 488                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 489                                 pfData->FileNameLength;
 490         } else
 491                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 492         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 493         /* validate that new_entry is not past end of SMB */
 494         if(new_entry >= end_of_smb) {
 495                 cERROR(1,
 496                       ("search entry %p began after end of SMB %p old entry %p",
 497                         new_entry, end_of_smb, old_entry));
 498                 return NULL;
 499         } else if(((level == SMB_FIND_FILE_INFO_STANDARD) &&
 500                    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
 501                   ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 502                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 503                 cERROR(1,("search entry %p extends after end of SMB %p",
 504                         new_entry, end_of_smb));
 505                 return NULL;
 506         } else
 507                 return new_entry;
 508
 509 }
 510
 511 #define UNICODE_DOT cpu_to_le16(0x2e)
 512
 513 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 514 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 515 {
 516         int rc = 0;
 517         char * filename = NULL;
 518         int len = 0;
 519
 520         if(cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 521                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 522                 filename = &pFindData->FileName[0];
 523                 if(cfile->srch_inf.unicode) {
 524                         len = cifs_unicode_bytelen(filename);
 525                 } else {
 526                         /* BB should we make this strnlen of PATH_MAX? */
 527                         len = strnlen(filename, 5);
 528                 }
 529         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 530                 FILE_DIRECTORY_INFO * pFindData =
 531                         (FILE_DIRECTORY_INFO *)current_entry;
 532                 filename = &pFindData->FileName[0];
 533                 len = le32_to_cpu(pFindData->FileNameLength);
 534         } else if(cfile->srch_inf.info_level ==
 535                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 536                 FILE_FULL_DIRECTORY_INFO * pFindData =
 537                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 538                 filename = &pFindData->FileName[0];
 539                 len = le32_to_cpu(pFindData->FileNameLength);
 540         } else if(cfile->srch_inf.info_level ==
 541                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 542                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 543                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 544                 filename = &pFindData->FileName[0];
 545                 len = le32_to_cpu(pFindData->FileNameLength);
 546         } else if(cfile->srch_inf.info_level ==
 547                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 548                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 549                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 550                 filename = &pFindData->FileName[0];
 551                 len = le32_to_cpu(pFindData->FileNameLength);
 552         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 553                 FIND_FILE_STANDARD_INFO * pFindData =
 554                         (FIND_FILE_STANDARD_INFO *)current_entry;
 555                 filename = &pFindData->FileName[0];
 556                 len = pFindData->FileNameLength;
 557         } else {
 558                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 559         }
 560
 561         if(filename) {
 562                 if(cfile->srch_inf.unicode) {
 563                         __le16 *ufilename = (__le16 *)filename;
 564                         if(len == 2) {
 565                                 /* check for . */
 566                                 if(ufilename[0] == UNICODE_DOT)
 567                                         rc = 1;
 568                         } else if(len == 4) {
 569                                 /* check for .. */
 570                                 if((ufilename[0] == UNICODE_DOT)
 571                                    &&(ufilename[1] == UNICODE_DOT))
 572                                         rc = 2;
 573                         }
 574                 } else /* ASCII */ {
 575                         if(len == 1) {
 576                                 if(filename[0] == '.')
 577                                         rc = 1;
 578                         } else if(len == 2) {
 579                                 if((filename[0] == '.') && (filename[1] == '.'))
 580                                         rc = 2;
 581                         }
 582                 }
 583         }
 584
 585         return rc;
 586 }
 587
 588 /* Check if directory that we are searching has changed so we can decide
 589    whether we can use the cached search results from the previous search */
 590 static int is_dir_changed(struct file * file)
 591 {
 592         struct inode * inode;
 593         struct cifsInodeInfo *cifsInfo;
 594
 595         if(file->f_dentry == NULL)
 596                 return 0;
 597
 598         inode = file->f_dentry->d_inode;
 599
 600         if(inode == NULL)
 601                 return 0;
 602
 603         cifsInfo = CIFS_I(inode);
 604
 605         if(cifsInfo->time == 0)
 606                 return 1; /* directory was changed, perhaps due to unlink */
 607         else
 608                 return 0;
 609
 610 }
 611
 612 /* find the corresponding entry in the search */
 613 /* Note that the SMB server returns search entries for . and .. which
 614    complicates logic here if we choose to parse for them and we do not
 615    assume that they are located in the findfirst return buffer.*/
 616 /* We start counting in the buffer with entry 2 and increment for every
 617    entry (do not increment for . or .. entry) */
 618 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 619         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 620 {
 621         int rc = 0;
 622         int pos_in_buf = 0;
 623         loff_t first_entry_in_buffer;
 624         loff_t index_to_find = file->f_pos;
 625         struct cifsFileInfo * cifsFile = file->private_data;
 626         /* check if index in the buffer */
 627
 628         if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 629            (num_to_ret == NULL))
 630                 return -ENOENT;
 631
 632         *ppCurrentEntry = NULL;
 633         first_entry_in_buffer =
 634                 cifsFile->srch_inf.index_of_last_entry -
 635                         cifsFile->srch_inf.entries_in_buffer;
 636
 637         /* if first entry in buf is zero then is first buffer
 638         in search response data which means it is likely . and ..
 639         will be in this buffer, although some servers do not return
 640         . and .. for the root of a drive and for those we need
 641         to start two entries earlier */
 642
 643 #ifdef CONFIG_CIFS_DEBUG2
 644         dump_cifs_file_struct(file, "In fce ");
 645 #endif
 646         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 647              is_dir_changed(file)) ||
 648            (index_to_find < first_entry_in_buffer)) {
 649                 /* close and restart search */
 650                 cFYI(1,("search backing up - close and restart search"));
 651                 cifsFile->invalidHandle = TRUE;
 652                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 653                 kfree(cifsFile->search_resume_name);
 654                 cifsFile->search_resume_name = NULL;
 655                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 656                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 657                         if(cifsFile->srch_inf.smallBuf)
 658                                 cifs_small_buf_release(cifsFile->srch_inf.
 659                                                 ntwrk_buf_start);
 660                         else
 661                                 cifs_buf_release(cifsFile->srch_inf.
 662                                                 ntwrk_buf_start);
 663                 }
 664                 rc = initiate_cifs_search(xid,file);
 665                 if(rc) {
 666                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 667                         return rc;
 668                 }
 669         }
 670
 671         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 672               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 673                 cFYI(1,("calling findnext2"));
 674                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 675                                   &cifsFile->srch_inf);
 676                 if(rc)
 677                         return -ENOENT;
 678         }
 679         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 680                 /* we found the buffer that contains the entry */
 681                 /* scan and find it */
 682                 int i;
 683                 char * current_entry;
 684                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 685                         smbCalcSize((struct smb_hdr *)
 686                                 cifsFile->srch_inf.ntwrk_buf_start);
 687
 688                 current_entry = cifsFile->srch_inf.srch_entries_start;
 689                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 690                                         - cifsFile->srch_inf.entries_in_buffer;
 691                 pos_in_buf = index_to_find - first_entry_in_buffer;
 692                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 693
 694                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 695                         /* go entry by entry figuring out which is first */
 696                         current_entry = nxt_dir_entry(current_entry,end_of_smb,
 697                                                 cifsFile->srch_inf.info_level);
 698                 }
 699                 if((current_entry == NULL) && (i < pos_in_buf)) {
 700                         /* BB fixme - check if we should flag this error */
 701                         cERROR(1,("reached end of buf searching for pos in buf"
 702                           " %d index to find %lld rc %d",
 703                           pos_in_buf,index_to_find,rc));
 704                 }
 705                 rc = 0;
 706                 *ppCurrentEntry = current_entry;
 707         } else {
 708                 cFYI(1,("index not in buffer - could not findnext into it"));
 709                 return 0;
 710         }
 711
 712         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 713                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 714                 *num_to_ret = 0;
 715         } else
 716                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 717
 718         return rc;
 719 }
 720
 721 /* inode num, inode type and filename returned */
 722 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 723         char *current_entry, __u16 level, unsigned int unicode,
 724         struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
 725 {
 726         int rc = 0;
 727         unsigned int len = 0;
 728         char * filename;
 729         struct nls_table * nlt = cifs_sb->local_nls;
 730
 731         *pinum = 0;
 732
 733         if(level == SMB_FIND_FILE_UNIX) {
 734                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 735
 736                 filename = &pFindData->FileName[0];
 737                 if(unicode) {
 738                         len = cifs_unicode_bytelen(filename);
 739                 } else {
 740                         /* BB should we make this strnlen of PATH_MAX? */
 741                         len = strnlen(filename, PATH_MAX);
 742                 }
 743
 744                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 745                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 746                         *pinum = pFindData->UniqueId;
 747         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 748                 FILE_DIRECTORY_INFO * pFindData =
 749                         (FILE_DIRECTORY_INFO *)current_entry;
 750                 filename = &pFindData->FileName[0];
 751                 len = le32_to_cpu(pFindData->FileNameLength);
 752         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 753                 FILE_FULL_DIRECTORY_INFO * pFindData =
 754                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 755                 filename = &pFindData->FileName[0];
 756                 len = le32_to_cpu(pFindData->FileNameLength);
 757         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 758                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 759                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 760                 filename = &pFindData->FileName[0];
 761                 len = le32_to_cpu(pFindData->FileNameLength);
 762                 *pinum = pFindData->UniqueId;
 763         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 764                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 765                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 766                 filename = &pFindData->FileName[0];
 767                 len = le32_to_cpu(pFindData->FileNameLength);
 768         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 769                 FIND_FILE_STANDARD_INFO * pFindData =
 770                         (FIND_FILE_STANDARD_INFO *)current_entry;
 771                 filename = &pFindData->FileName[0];
 772                 /* one byte length, no name conversion */
 773                 len = (unsigned int)pFindData->FileNameLength;
 774         } else {
 775                 cFYI(1,("Unknown findfirst level %d",level));
 776                 return -EINVAL;
 777         }
 778
 779         if(len > max_len) {
 780                 cERROR(1,("bad search response length %d past smb end", len));
 781                 return -EINVAL;
 782         }
 783
 784         if(unicode) {
 785                 /* BB fixme - test with long names */
 786                 /* Note converted filename can be longer than in unicode */
 787                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 788                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 789                                         (__le16 *)filename, len/2, nlt);
 790                 else
 791                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 792                                         (__le16 *)filename,len/2,nlt);
 793         } else {
 794                 pqst->name = filename;
 795                 pqst->len = len;
 796         }
 797         pqst->hash = full_name_hash(pqst->name,pqst->len);
 798 /*      cFYI(1,("filldir on %s",pqst->name));  */
 799         return rc;
 800 }
 801
 802 static int cifs_filldir(char *pfindEntry, struct file *file,
 803         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 804 {
 805         int rc = 0;
 806         struct qstr qstring;
 807         struct cifsFileInfo * pCifsF;
 808         unsigned obj_type;
 809         ino_t  inum;
 810         struct cifs_sb_info * cifs_sb;
 811         struct inode *tmp_inode;
 812         struct dentry *tmp_dentry;
 813
 814         /* get filename and len into qstring */
 815         /* get dentry */
 816         /* decide whether to create and populate ionde */
 817         if((direntry == NULL) || (file == NULL))
 818                 return -EINVAL;
 819
 820         pCifsF = file->private_data;
 821
 822         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 823                 return -ENOENT;
 824
 825         if(file->f_dentry == NULL)
 826                 return -ENOENT;
 827
 828         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
 829         /* skip . and .. since we added them first */
 830         if(rc != 0)
 831                 return 0;
 832
 833         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 834
 835         qstring.name = scratch_buf;
 836         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 837                         pCifsF->srch_inf.info_level,
 838                         pCifsF->srch_inf.unicode,cifs_sb,
 839                         max_len,
 840                         &inum /* returned */);
 841
 842         if(rc)
 843                 return rc;
 844
 845         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 846         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 847                 return -ENOMEM;
 848
 849         if(rc) {
 850                 /* inode created, we need to hash it with right inode number */
 851                 if(inum != 0) {
 852                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 853                         tmp_inode->i_ino = inum;
 854                 }
 855                 insert_inode_hash(tmp_inode);
 856         }
 857
 858         /* we pass in rc below, indicating whether it is a new inode,
 859            so we can figure out whether to invalidate the inode cached
 860            data if the file has changed */
 861         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 862                 unix_fill_in_inode(tmp_inode,
 863                                    (FILE_UNIX_INFO *)pfindEntry,
 864                                    &obj_type, rc);
 865         else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 866                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 867                                 pfindEntry, &obj_type, rc);
 868         else
 869                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 870
 871         if(rc) /* new inode - needs to be tied to dentry */ {
 872                 d_instantiate(tmp_dentry, tmp_inode);
 873                 if(rc == 2)
 874                         d_rehash(tmp_dentry);
 875         }
 876
 877
 878         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 879                      tmp_inode->i_ino,obj_type);
 880         if(rc) {
 881                 cFYI(1,("filldir rc = %d",rc));
 882         }
 883
 884         dput(tmp_dentry);
 885         return rc;
 886 }
 887
 888 static int cifs_save_resume_key(const char *current_entry,
 889         struct cifsFileInfo *cifsFile)
 890 {
 891         int rc = 0;
 892         unsigned int len = 0;
 893         __u16 level;
 894         char * filename;
 895
 896         if((cifsFile == NULL) || (current_entry == NULL))
 897                 return -EINVAL;
 898
 899         level = cifsFile->srch_inf.info_level;
 900
 901         if(level == SMB_FIND_FILE_UNIX) {
 902                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 903
 904                 filename = &pFindData->FileName[0];
 905                 if(cifsFile->srch_inf.unicode) {
 906                         len = cifs_unicode_bytelen(filename);
 907                 } else {
 908                         /* BB should we make this strnlen of PATH_MAX? */
 909                         len = strnlen(filename, PATH_MAX);
 910                 }
 911                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 912         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 913                 FILE_DIRECTORY_INFO * pFindData =
 914                         (FILE_DIRECTORY_INFO *)current_entry;
 915                 filename = &pFindData->FileName[0];
 916                 len = le32_to_cpu(pFindData->FileNameLength);
 917                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 918         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 919                 FILE_FULL_DIRECTORY_INFO * pFindData =
 920                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 921                 filename = &pFindData->FileName[0];
 922                 len = le32_to_cpu(pFindData->FileNameLength);
 923                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 924         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 925                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 926                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 927                 filename = &pFindData->FileName[0];
 928                 len = le32_to_cpu(pFindData->FileNameLength);
 929                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 930         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 931                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 932                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 933                 filename = &pFindData->FileName[0];
 934                 len = le32_to_cpu(pFindData->FileNameLength);
 935                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 936         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 937                 FIND_FILE_STANDARD_INFO * pFindData =
 938                         (FIND_FILE_STANDARD_INFO *)current_entry;
 939                 filename = &pFindData->FileName[0];
 940                 /* one byte length, no name conversion */
 941                 len = (unsigned int)pFindData->FileNameLength;
 942         } else {
 943                 cFYI(1,("Unknown findfirst level %d",level));
 944                 return -EINVAL;
 945         }
 946         cifsFile->srch_inf.resume_name_len = len;
 947         cifsFile->srch_inf.presume_name = filename;
 948         return rc;
 949 }
 950
 951 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 952 {
 953         int rc = 0;
 954         int xid,i;
 955         struct cifs_sb_info *cifs_sb;
 956         struct cifsTconInfo *pTcon;
 957         struct cifsFileInfo *cifsFile = NULL;
 958         char * current_entry;
 959         int num_to_fill = 0;
 960         char * tmp_buf = NULL;
 961         char * end_of_smb;
 962         int max_len;
 963
 964         xid = GetXid();
 965
 966         if(file->f_dentry == NULL) {
 967                 FreeXid(xid);
 968                 return -EIO;
 969         }
 970
 971         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 972         pTcon = cifs_sb->tcon;
 973         if(pTcon == NULL)
 974                 return -EINVAL;
 975
 976         switch ((int) file->f_pos) {
 977         case 0:
 978                 if (filldir(direntry, ".", 1, file->f_pos,
 979                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 980                         cERROR(1, ("Filldir for current dir failed"));
 981                         rc = -ENOMEM;
 982                         break;
 983                 }
 984                 file->f_pos++;
 985         case 1:
 986                 if (filldir(direntry, "..", 2, file->f_pos,
 987                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 988                         cERROR(1, ("Filldir for parent dir failed"));
 989                         rc = -ENOMEM;
 990                         break;
 991                 }
 992                 file->f_pos++;
 993         default:
 994                 /* 1) If search is active,
 995                         is in current search buffer?
 996                         if it before then restart search
 997                         if after then keep searching till find it */
 998
 999                 if(file->private_data == NULL) {
1000                         rc = initiate_cifs_search(xid,file);
1001                         cFYI(1,("initiate cifs search rc %d",rc));
1002                         if(rc) {
1003                                 FreeXid(xid);
1004                                 return rc;
1005                         }
1006                 }
1007                 if(file->private_data == NULL) {
1008                         rc = -EINVAL;
1009                         FreeXid(xid);
1010                         return rc;
1011                 }
1012                 cifsFile = file->private_data;
1013                 if (cifsFile->srch_inf.endOfSearch) {
1014                         if(cifsFile->srch_inf.emptyDir) {
1015                                 cFYI(1, ("End of search, empty dir"));
1016                                 rc = 0;
1017                                 break;
1018                         }
1019                 } /* else {
1020                         cifsFile->invalidHandle = TRUE;
1021                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1022                 }
1023                 kfree(cifsFile->search_resume_name);
1024                 cifsFile->search_resume_name = NULL; */
1025
1026                 rc = find_cifs_entry(xid,pTcon, file,
1027                                 &current_entry,&num_to_fill);
1028                 if(rc) {
1029                         cFYI(1,("fce error %d",rc));
1030                         goto rddir2_exit;
1031                 } else if (current_entry != NULL) {
1032                         cFYI(1,("entry %lld found",file->f_pos));
1033                 } else {
1034                         cFYI(1,("could not find entry"));
1035                         goto rddir2_exit;
1036                 }
1037                 cFYI(1,("loop through %d times filling dir for net buf %p",
1038                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1039                 max_len = smbCalcSize((struct smb_hdr *)
1040                                 cifsFile->srch_inf.ntwrk_buf_start);
1041                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1042
1043                 /* To be safe - for UCS to UTF-8 with strings loaded
1044                 with the rare long characters alloc more to account for
1045                 such multibyte target UTF-8 characters. cifs_unicode.c,
1046                 which actually does the conversion, has the same limit */
1047                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1048                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1049                         if(current_entry == NULL) {
1050                                 /* evaluate whether this case is an error */
1051                                 cERROR(1,("past end of SMB num to fill %d i %d",
1052                                           num_to_fill, i));
1053                                 break;
1054                         }
1055                         /* if buggy server returns . and .. late do
1056                         we want to check for that here? */
1057                         rc = cifs_filldir(current_entry, file,
1058                                         filldir, direntry, tmp_buf, max_len);
1059                         file->f_pos++;
1060                         if(file->f_pos ==
1061                                 cifsFile->srch_inf.index_of_last_entry) {
1062                                 cFYI(1,("last entry in buf at pos %lld %s",
1063                                         file->f_pos,tmp_buf));
1064                                 cifs_save_resume_key(current_entry,cifsFile);
1065                                 break;
1066                         } else
1067                                 current_entry =
1068                                         nxt_dir_entry(current_entry, end_of_smb,
1069                                                 cifsFile->srch_inf.info_level);
1070                 }
1071                 kfree(tmp_buf);
1072                 break;
1073         } /* end switch */
1074
1075 rddir2_exit:
1076         FreeXid(xid);
1077         return rc;
1078 }