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   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 /*              struct timespec ts;*/
 139                 FIND_FILE_STANDARD_INFO * pfindData =
 140                         (FIND_FILE_STANDARD_INFO *)buf;
 141
 142 /*              ts = cnvrtDosUnixTm(
 143                                 le16_to_cpu(pfindData->LastWriteDate),
 144                                 le16_to_cpu(pfindData->LastWriteTime));*/
 145                 attr = le16_to_cpu(pfindData->Attributes);
 146                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
 147                 end_of_file = le32_to_cpu(pfindData->DataSize);
 148                 /* do not need to use current_fs_time helper function since
 149                  time not stored for this case so atime can not "go backwards"
 150                  by pulling newer older from disk when inode refrenshed */
 151                 tmp_inode->i_atime = CURRENT_TIME;
 152                 /* tmp_inode->i_mtime =  BB FIXME - add dos time handling
 153                 tmp_inode->i_ctime = 0;   BB FIXME */
 154
 155         }
 156
 157         /* Linux can not store file creation time unfortunately so ignore it */
 158
 159         cifsInfo->cifsAttrs = attr;
 160         cifsInfo->time = jiffies;
 161
 162         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 163         /* 2767 perms - indicate mandatory locking */
 164                 /* BB fill in uid and gid here? with help from winbind?
 165                    or retrieve from NTFS stream extended attribute */
 166         if (atomic_read(&cifsInfo->inUse) == 0) {
 167                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 168                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 169                 /* set default mode. will override for dirs below */
 170                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 171         } else {
 172                 /* mask off the type bits since it gets set
 173                 below and we do not want to get two type
 174                 bits set */
 175                 tmp_inode->i_mode &= ~S_IFMT;
 176         }
 177
 178         if (attr & ATTR_DIRECTORY) {
 179                 *pobject_type = DT_DIR;
 180                 /* override default perms since we do not lock dirs */
 181                 if(atomic_read(&cifsInfo->inUse) == 0) {
 182                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 183                 }
 184                 tmp_inode->i_mode |= S_IFDIR;
 185         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 186                    (attr & ATTR_SYSTEM)) {
 187                 if (end_of_file == 0)  {
 188                         *pobject_type = DT_FIFO;
 189                         tmp_inode->i_mode |= S_IFIFO;
 190                 } else {
 191                         /* rather than get the type here, we mark the
 192                         inode as needing revalidate and get the real type
 193                         (blk vs chr vs. symlink) later ie in lookup */
 194                         *pobject_type = DT_REG;
 195                         tmp_inode->i_mode |= S_IFREG;
 196                         cifsInfo->time = 0;
 197                 }
 198 /* we no longer mark these because we could not follow them */
 199 /*        } else if (attr & ATTR_REPARSE) {
 200                 *pobject_type = DT_LNK;
 201                 tmp_inode->i_mode |= S_IFLNK; */
 202         } else {
 203                 *pobject_type = DT_REG;
 204                 tmp_inode->i_mode |= S_IFREG;
 205                 if (attr & ATTR_READONLY)
 206                         tmp_inode->i_mode &= ~(S_IWUGO);
 207         } /* could add code here - to validate if device or weird share type? */
 208
 209         /* can not fill in nlink here as in qpathinfo version and Unx search */
 210         if (atomic_read(&cifsInfo->inUse) == 0) {
 211                 atomic_set(&cifsInfo->inUse, 1);
 212         }
 213
 214         if (is_size_safe_to_change(cifsInfo)) {
 215                 /* can not safely change the file size here if the
 216                 client is writing to it due to potential races */
 217                 i_size_write(tmp_inode, end_of_file);
 218
 219         /* 512 bytes (2**9) is the fake blocksize that must be used */
 220         /* for this calculation, even though the reported blocksize is larger */
 221                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 222         }
 223
 224         if (allocation_size < end_of_file)
 225                 cFYI(1, ("May be sparse file, allocation less than file size"));
 226         cFYI(1, ("File Size %ld and blocks %llu and blocksize %ld",
 227                 (unsigned long)tmp_inode->i_size,
 228                 (unsigned long long)tmp_inode->i_blocks,
 229                 tmp_inode->i_blksize));
 230         if (S_ISREG(tmp_inode->i_mode)) {
 231                 cFYI(1, ("File inode"));
 232                 tmp_inode->i_op = &cifs_file_inode_ops;
 233                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 234                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 235                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 236                         else
 237                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 238
 239                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 240                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 241                 else
 242                         tmp_inode->i_fop = &cifs_file_ops;
 243
 244                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 245                    (cifs_sb->tcon->ses->server->maxBuf <
 246                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 247                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 248                 else
 249                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 250
 251                 if(isNewInode)
 252                         return; /* No sense invalidating pages for new inode
 253                                    since have not started caching readahead file
 254                                    data yet */
 255
 256                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 257                         (local_size == tmp_inode->i_size)) {
 258                         cFYI(1, ("inode exists but unchanged"));
 259                 } else {
 260                         /* file may have changed on server */
 261                         cFYI(1, ("invalidate inode, readdir detected change"));
 262                         invalidate_remote_inode(tmp_inode);
 263                 }
 264         } else if (S_ISDIR(tmp_inode->i_mode)) {
 265                 cFYI(1, ("Directory inode"));
 266                 tmp_inode->i_op = &cifs_dir_inode_ops;
 267                 tmp_inode->i_fop = &cifs_dir_ops;
 268         } else if (S_ISLNK(tmp_inode->i_mode)) {
 269                 cFYI(1, ("Symbolic Link inode"));
 270                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 271         } else {
 272                 cFYI(1, ("Init special inode"));
 273                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 274                                    tmp_inode->i_rdev);
 275         }
 276 }
 277
 278 static void unix_fill_in_inode(struct inode *tmp_inode,
 279         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 280 {
 281         loff_t local_size;
 282         struct timespec local_mtime;
 283
 284         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 285         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 286
 287         __u32 type = le32_to_cpu(pfindData->Type);
 288         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 289         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 290         cifsInfo->time = jiffies;
 291         atomic_inc(&cifsInfo->inUse);
 292
 293         /* save mtime and size */
 294         local_mtime = tmp_inode->i_mtime;
 295         local_size  = tmp_inode->i_size;
 296
 297         tmp_inode->i_atime =
 298             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 299         tmp_inode->i_mtime =
 300             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 301         tmp_inode->i_ctime =
 302             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 303
 304         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 305         /* since we set the inode type below we need to mask off type
 306            to avoid strange results if bits above were corrupt */
 307         tmp_inode->i_mode &= ~S_IFMT;
 308         if (type == UNIX_FILE) {
 309                 *pobject_type = DT_REG;
 310                 tmp_inode->i_mode |= S_IFREG;
 311         } else if (type == UNIX_SYMLINK) {
 312                 *pobject_type = DT_LNK;
 313                 tmp_inode->i_mode |= S_IFLNK;
 314         } else if (type == UNIX_DIR) {
 315                 *pobject_type = DT_DIR;
 316                 tmp_inode->i_mode |= S_IFDIR;
 317         } else if (type == UNIX_CHARDEV) {
 318                 *pobject_type = DT_CHR;
 319                 tmp_inode->i_mode |= S_IFCHR;
 320                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 321                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 322         } else if (type == UNIX_BLOCKDEV) {
 323                 *pobject_type = DT_BLK;
 324                 tmp_inode->i_mode |= S_IFBLK;
 325                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 326                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 327         } else if (type == UNIX_FIFO) {
 328                 *pobject_type = DT_FIFO;
 329                 tmp_inode->i_mode |= S_IFIFO;
 330         } else if (type == UNIX_SOCKET) {
 331                 *pobject_type = DT_SOCK;
 332                 tmp_inode->i_mode |= S_IFSOCK;
 333         } else {
 334                 /* safest to just call it a file */
 335                 *pobject_type = DT_REG;
 336                 tmp_inode->i_mode |= S_IFREG;
 337                 cFYI(1,("unknown inode type %d",type));
 338         }
 339
 340         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 341         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 342         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 343
 344         if (is_size_safe_to_change(cifsInfo)) {
 345                 /* can not safely change the file size here if the
 346                 client is writing to it due to potential races */
 347                 i_size_write(tmp_inode,end_of_file);
 348
 349         /* 512 bytes (2**9) is the fake blocksize that must be used */
 350         /* for this calculation, not the real blocksize */
 351                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 352         }
 353
 354         if (S_ISREG(tmp_inode->i_mode)) {
 355                 cFYI(1, ("File inode"));
 356                 tmp_inode->i_op = &cifs_file_inode_ops;
 357
 358                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 359                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 360                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 361                         else
 362                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 363
 364                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 365                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 366                 else
 367                         tmp_inode->i_fop = &cifs_file_ops;
 368
 369                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 370                    (cifs_sb->tcon->ses->server->maxBuf <
 371                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 372                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 373                 else
 374                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 375
 376                 if(isNewInode)
 377                         return; /* No sense invalidating pages for new inode since we
 378                                            have not started caching readahead file data yet */
 379
 380                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 381                         (local_size == tmp_inode->i_size)) {
 382                         cFYI(1, ("inode exists but unchanged"));
 383                 } else {
 384                         /* file may have changed on server */
 385                         cFYI(1, ("invalidate inode, readdir detected change"));
 386                         invalidate_remote_inode(tmp_inode);
 387                 }
 388         } else if (S_ISDIR(tmp_inode->i_mode)) {
 389                 cFYI(1, ("Directory inode"));
 390                 tmp_inode->i_op = &cifs_dir_inode_ops;
 391                 tmp_inode->i_fop = &cifs_dir_ops;
 392         } else if (S_ISLNK(tmp_inode->i_mode)) {
 393                 cFYI(1, ("Symbolic Link inode"));
 394                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 395 /* tmp_inode->i_fop = *//* do not need to set to anything */
 396         } else {
 397                 cFYI(1, ("Special inode"));
 398                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 399                                    tmp_inode->i_rdev);
 400         }
 401 }
 402
 403 static int initiate_cifs_search(const int xid, struct file *file)
 404 {
 405         int rc = 0;
 406         char * full_path;
 407         struct cifsFileInfo * cifsFile;
 408         struct cifs_sb_info *cifs_sb;
 409         struct cifsTconInfo *pTcon;
 410
 411         if(file->private_data == NULL) {
 412                 file->private_data =
 413                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 414         }
 415
 416         if(file->private_data == NULL) {
 417                 return -ENOMEM;
 418         } else {
 419                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 420         }
 421         cifsFile = file->private_data;
 422         cifsFile->invalidHandle = TRUE;
 423         cifsFile->srch_inf.endOfSearch = FALSE;
 424
 425         if(file->f_dentry == NULL)
 426                 return -ENOENT;
 427
 428         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 429         if(cifs_sb == NULL)
 430                 return -EINVAL;
 431
 432         pTcon = cifs_sb->tcon;
 433         if(pTcon == NULL)
 434                 return -EINVAL;
 435
 436         full_path = build_path_from_dentry(file->f_dentry);
 437
 438         if(full_path == NULL) {
 439                 return -ENOMEM;
 440         }
 441
 442         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 443
 444 ffirst_retry:
 445         /* test for Unix extensions */
 446         if (pTcon->ses->capabilities & CAP_UNIX) {
 447                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 448         } else if ((pTcon->ses->capabilities &
 449                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 450                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 451         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 452                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 453         } else /* not srvinos - BB fixme add check for backlevel? */ {
 454                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 455         }
 456
 457         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 458                 &cifsFile->netfid, &cifsFile->srch_inf,
 459                 cifs_sb->mnt_cifs_flags &
 460                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 461         if(rc == 0)
 462                 cifsFile->invalidHandle = FALSE;
 463         if((rc == -EOPNOTSUPP) &&
 464                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 465                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 466                 goto ffirst_retry;
 467         }
 468         kfree(full_path);
 469         return rc;
 470 }
 471
 472 /* return length of unicode string in bytes */
 473 static int cifs_unicode_bytelen(char *str)
 474 {
 475         int len;
 476         __le16 * ustr = (__le16 *)str;
 477
 478         for(len=0;len <= PATH_MAX;len++) {
 479                 if(ustr[len] == 0)
 480                         return len << 1;
 481         }
 482         cFYI(1,("Unicode string longer than PATH_MAX found"));
 483         return len << 1;
 484 }
 485
 486 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 487 {
 488         char * new_entry;
 489         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 490
 491         if(level == SMB_FIND_FILE_INFO_STANDARD) {
 492                 FIND_FILE_STANDARD_INFO * pfData;
 493                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 494
 495                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 496                                 pfData->FileNameLength;
 497         } else
 498                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 499         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 500         /* validate that new_entry is not past end of SMB */
 501         if(new_entry >= end_of_smb) {
 502                 cERROR(1,
 503                       ("search entry %p began after end of SMB %p old entry %p",
 504                         new_entry, end_of_smb, old_entry));
 505                 return NULL;
 506         } else if(((level == SMB_FIND_FILE_INFO_STANDARD) &&
 507                    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
 508                   ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 509                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 510                 cERROR(1,("search entry %p extends after end of SMB %p",
 511                         new_entry, end_of_smb));
 512                 return NULL;
 513         } else
 514                 return new_entry;
 515
 516 }
 517
 518 #define UNICODE_DOT cpu_to_le16(0x2e)
 519
 520 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 521 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 522 {
 523         int rc = 0;
 524         char * filename = NULL;
 525         int len = 0;
 526
 527         if(cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 528                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 529                 filename = &pFindData->FileName[0];
 530                 if(cfile->srch_inf.unicode) {
 531                         len = cifs_unicode_bytelen(filename);
 532                 } else {
 533                         /* BB should we make this strnlen of PATH_MAX? */
 534                         len = strnlen(filename, 5);
 535                 }
 536         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 537                 FILE_DIRECTORY_INFO * pFindData =
 538                         (FILE_DIRECTORY_INFO *)current_entry;
 539                 filename = &pFindData->FileName[0];
 540                 len = le32_to_cpu(pFindData->FileNameLength);
 541         } else if(cfile->srch_inf.info_level ==
 542                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 543                 FILE_FULL_DIRECTORY_INFO * pFindData =
 544                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 545                 filename = &pFindData->FileName[0];
 546                 len = le32_to_cpu(pFindData->FileNameLength);
 547         } else if(cfile->srch_inf.info_level ==
 548                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 549                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 550                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 551                 filename = &pFindData->FileName[0];
 552                 len = le32_to_cpu(pFindData->FileNameLength);
 553         } else if(cfile->srch_inf.info_level ==
 554                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 555                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 556                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 557                 filename = &pFindData->FileName[0];
 558                 len = le32_to_cpu(pFindData->FileNameLength);
 559         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 560                 FIND_FILE_STANDARD_INFO * pFindData =
 561                         (FIND_FILE_STANDARD_INFO *)current_entry;
 562                 filename = &pFindData->FileName[0];
 563                 len = pFindData->FileNameLength;
 564         } else {
 565                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 566         }
 567
 568         if(filename) {
 569                 if(cfile->srch_inf.unicode) {
 570                         __le16 *ufilename = (__le16 *)filename;
 571                         if(len == 2) {
 572                                 /* check for . */
 573                                 if(ufilename[0] == UNICODE_DOT)
 574                                         rc = 1;
 575                         } else if(len == 4) {
 576                                 /* check for .. */
 577                                 if((ufilename[0] == UNICODE_DOT)
 578                                    &&(ufilename[1] == UNICODE_DOT))
 579                                         rc = 2;
 580                         }
 581                 } else /* ASCII */ {
 582                         if(len == 1) {
 583                                 if(filename[0] == '.')
 584                                         rc = 1;
 585                         } else if(len == 2) {
 586                                 if((filename[0] == '.') && (filename[1] == '.'))
 587                                         rc = 2;
 588                         }
 589                 }
 590         }
 591
 592         return rc;
 593 }
 594
 595 /* Check if directory that we are searching has changed so we can decide
 596    whether we can use the cached search results from the previous search */
 597 static int is_dir_changed(struct file * file)
 598 {
 599         struct inode * inode;
 600         struct cifsInodeInfo *cifsInfo;
 601
 602         if(file->f_dentry == NULL)
 603                 return 0;
 604
 605         inode = file->f_dentry->d_inode;
 606
 607         if(inode == NULL)
 608                 return 0;
 609
 610         cifsInfo = CIFS_I(inode);
 611
 612         if(cifsInfo->time == 0)
 613                 return 1; /* directory was changed, perhaps due to unlink */
 614         else
 615                 return 0;
 616
 617 }
 618
 619 /* find the corresponding entry in the search */
 620 /* Note that the SMB server returns search entries for . and .. which
 621    complicates logic here if we choose to parse for them and we do not
 622    assume that they are located in the findfirst return buffer.*/
 623 /* We start counting in the buffer with entry 2 and increment for every
 624    entry (do not increment for . or .. entry) */
 625 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 626         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 627 {
 628         int rc = 0;
 629         int pos_in_buf = 0;
 630         loff_t first_entry_in_buffer;
 631         loff_t index_to_find = file->f_pos;
 632         struct cifsFileInfo * cifsFile = file->private_data;
 633         /* check if index in the buffer */
 634
 635         if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 636            (num_to_ret == NULL))
 637                 return -ENOENT;
 638
 639         *ppCurrentEntry = NULL;
 640         first_entry_in_buffer =
 641                 cifsFile->srch_inf.index_of_last_entry -
 642                         cifsFile->srch_inf.entries_in_buffer;
 643
 644         /* if first entry in buf is zero then is first buffer
 645         in search response data which means it is likely . and ..
 646         will be in this buffer, although some servers do not return
 647         . and .. for the root of a drive and for those we need
 648         to start two entries earlier */
 649
 650 #ifdef CONFIG_CIFS_DEBUG2
 651         dump_cifs_file_struct(file, "In fce ");
 652 #endif
 653         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 654              is_dir_changed(file)) ||
 655            (index_to_find < first_entry_in_buffer)) {
 656                 /* close and restart search */
 657                 cFYI(1,("search backing up - close and restart search"));
 658                 cifsFile->invalidHandle = TRUE;
 659                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 660                 kfree(cifsFile->search_resume_name);
 661                 cifsFile->search_resume_name = NULL;
 662                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 663                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 664                         if(cifsFile->srch_inf.smallBuf)
 665                                 cifs_small_buf_release(cifsFile->srch_inf.
 666                                                 ntwrk_buf_start);
 667                         else
 668                                 cifs_buf_release(cifsFile->srch_inf.
 669                                                 ntwrk_buf_start);
 670                 }
 671                 rc = initiate_cifs_search(xid,file);
 672                 if(rc) {
 673                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 674                         return rc;
 675                 }
 676         }
 677
 678         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 679               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 680                 cFYI(1,("calling findnext2"));
 681                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 682                                   &cifsFile->srch_inf);
 683                 if(rc)
 684                         return -ENOENT;
 685         }
 686         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 687                 /* we found the buffer that contains the entry */
 688                 /* scan and find it */
 689                 int i;
 690                 char * current_entry;
 691                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 692                         smbCalcSize((struct smb_hdr *)
 693                                 cifsFile->srch_inf.ntwrk_buf_start);
 694
 695                 current_entry = cifsFile->srch_inf.srch_entries_start;
 696                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 697                                         - cifsFile->srch_inf.entries_in_buffer;
 698                 pos_in_buf = index_to_find - first_entry_in_buffer;
 699                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 700
 701                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 702                         /* go entry by entry figuring out which is first */
 703                         current_entry = nxt_dir_entry(current_entry,end_of_smb,
 704                                                 cifsFile->srch_inf.info_level);
 705                 }
 706                 if((current_entry == NULL) && (i < pos_in_buf)) {
 707                         /* BB fixme - check if we should flag this error */
 708                         cERROR(1,("reached end of buf searching for pos in buf"
 709                           " %d index to find %lld rc %d",
 710                           pos_in_buf,index_to_find,rc));
 711                 }
 712                 rc = 0;
 713                 *ppCurrentEntry = current_entry;
 714         } else {
 715                 cFYI(1,("index not in buffer - could not findnext into it"));
 716                 return 0;
 717         }
 718
 719         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 720                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 721                 *num_to_ret = 0;
 722         } else
 723                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 724
 725         return rc;
 726 }
 727
 728 /* inode num, inode type and filename returned */
 729 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 730         char *current_entry, __u16 level, unsigned int unicode,
 731         struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
 732 {
 733         int rc = 0;
 734         unsigned int len = 0;
 735         char * filename;
 736         struct nls_table * nlt = cifs_sb->local_nls;
 737
 738         *pinum = 0;
 739
 740         if(level == SMB_FIND_FILE_UNIX) {
 741                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 742
 743                 filename = &pFindData->FileName[0];
 744                 if(unicode) {
 745                         len = cifs_unicode_bytelen(filename);
 746                 } else {
 747                         /* BB should we make this strnlen of PATH_MAX? */
 748                         len = strnlen(filename, PATH_MAX);
 749                 }
 750
 751                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 752                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 753                         *pinum = pFindData->UniqueId;
 754         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 755                 FILE_DIRECTORY_INFO * pFindData =
 756                         (FILE_DIRECTORY_INFO *)current_entry;
 757                 filename = &pFindData->FileName[0];
 758                 len = le32_to_cpu(pFindData->FileNameLength);
 759         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 760                 FILE_FULL_DIRECTORY_INFO * pFindData =
 761                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 762                 filename = &pFindData->FileName[0];
 763                 len = le32_to_cpu(pFindData->FileNameLength);
 764         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 765                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 766                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 767                 filename = &pFindData->FileName[0];
 768                 len = le32_to_cpu(pFindData->FileNameLength);
 769                 *pinum = pFindData->UniqueId;
 770         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 771                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 772                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 773                 filename = &pFindData->FileName[0];
 774                 len = le32_to_cpu(pFindData->FileNameLength);
 775         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 776                 FIND_FILE_STANDARD_INFO * pFindData =
 777                         (FIND_FILE_STANDARD_INFO *)current_entry;
 778                 filename = &pFindData->FileName[0];
 779                 /* one byte length, no name conversion */
 780                 len = (unsigned int)pFindData->FileNameLength;
 781         } else {
 782                 cFYI(1,("Unknown findfirst level %d",level));
 783                 return -EINVAL;
 784         }
 785
 786         if(len > max_len) {
 787                 cERROR(1,("bad search response length %d past smb end", len));
 788                 return -EINVAL;
 789         }
 790
 791         if(unicode) {
 792                 /* BB fixme - test with long names */
 793                 /* Note converted filename can be longer than in unicode */
 794                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 795                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 796                                         (__le16 *)filename, len/2, nlt);
 797                 else
 798                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 799                                         (__le16 *)filename,len/2,nlt);
 800         } else {
 801                 pqst->name = filename;
 802                 pqst->len = len;
 803         }
 804         pqst->hash = full_name_hash(pqst->name,pqst->len);
 805 /*      cFYI(1,("filldir on %s",pqst->name));  */
 806         return rc;
 807 }
 808
 809 static int cifs_filldir(char *pfindEntry, struct file *file,
 810         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 811 {
 812         int rc = 0;
 813         struct qstr qstring;
 814         struct cifsFileInfo * pCifsF;
 815         unsigned obj_type;
 816         ino_t  inum;
 817         struct cifs_sb_info * cifs_sb;
 818         struct inode *tmp_inode;
 819         struct dentry *tmp_dentry;
 820
 821         /* get filename and len into qstring */
 822         /* get dentry */
 823         /* decide whether to create and populate ionde */
 824         if((direntry == NULL) || (file == NULL))
 825                 return -EINVAL;
 826
 827         pCifsF = file->private_data;
 828
 829         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 830                 return -ENOENT;
 831
 832         if(file->f_dentry == NULL)
 833                 return -ENOENT;
 834
 835         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
 836         /* skip . and .. since we added them first */
 837         if(rc != 0)
 838                 return 0;
 839
 840         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 841
 842         qstring.name = scratch_buf;
 843         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 844                         pCifsF->srch_inf.info_level,
 845                         pCifsF->srch_inf.unicode,cifs_sb,
 846                         max_len,
 847                         &inum /* returned */);
 848
 849         if(rc)
 850                 return rc;
 851
 852         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 853         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 854                 return -ENOMEM;
 855
 856         if(rc) {
 857                 /* inode created, we need to hash it with right inode number */
 858                 if(inum != 0) {
 859                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 860                         tmp_inode->i_ino = inum;
 861                 }
 862                 insert_inode_hash(tmp_inode);
 863         }
 864
 865         /* we pass in rc below, indicating whether it is a new inode,
 866            so we can figure out whether to invalidate the inode cached
 867            data if the file has changed */
 868         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 869                 unix_fill_in_inode(tmp_inode,
 870                                    (FILE_UNIX_INFO *)pfindEntry,
 871                                    &obj_type, rc);
 872         else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 873                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 874                                 pfindEntry, &obj_type, rc);
 875         else
 876                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 877
 878         if(rc) /* new inode - needs to be tied to dentry */ {
 879                 d_instantiate(tmp_dentry, tmp_inode);
 880                 if(rc == 2)
 881                         d_rehash(tmp_dentry);
 882         }
 883
 884
 885         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 886                      tmp_inode->i_ino,obj_type);
 887         if(rc) {
 888                 cFYI(1,("filldir rc = %d",rc));
 889         }
 890
 891         dput(tmp_dentry);
 892         return rc;
 893 }
 894
 895 static int cifs_save_resume_key(const char *current_entry,
 896         struct cifsFileInfo *cifsFile)
 897 {
 898         int rc = 0;
 899         unsigned int len = 0;
 900         __u16 level;
 901         char * filename;
 902
 903         if((cifsFile == NULL) || (current_entry == NULL))
 904                 return -EINVAL;
 905
 906         level = cifsFile->srch_inf.info_level;
 907
 908         if(level == SMB_FIND_FILE_UNIX) {
 909                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 910
 911                 filename = &pFindData->FileName[0];
 912                 if(cifsFile->srch_inf.unicode) {
 913                         len = cifs_unicode_bytelen(filename);
 914                 } else {
 915                         /* BB should we make this strnlen of PATH_MAX? */
 916                         len = strnlen(filename, PATH_MAX);
 917                 }
 918                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 919         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 920                 FILE_DIRECTORY_INFO * pFindData =
 921                         (FILE_DIRECTORY_INFO *)current_entry;
 922                 filename = &pFindData->FileName[0];
 923                 len = le32_to_cpu(pFindData->FileNameLength);
 924                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 925         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 926                 FILE_FULL_DIRECTORY_INFO * pFindData =
 927                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 928                 filename = &pFindData->FileName[0];
 929                 len = le32_to_cpu(pFindData->FileNameLength);
 930                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 931         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 932                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 933                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 934                 filename = &pFindData->FileName[0];
 935                 len = le32_to_cpu(pFindData->FileNameLength);
 936                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 937         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 938                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 939                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 940                 filename = &pFindData->FileName[0];
 941                 len = le32_to_cpu(pFindData->FileNameLength);
 942                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 943         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 944                 FIND_FILE_STANDARD_INFO * pFindData =
 945                         (FIND_FILE_STANDARD_INFO *)current_entry;
 946                 filename = &pFindData->FileName[0];
 947                 /* one byte length, no name conversion */
 948                 len = (unsigned int)pFindData->FileNameLength;
 949         } else {
 950                 cFYI(1,("Unknown findfirst level %d",level));
 951                 return -EINVAL;
 952         }
 953         cifsFile->srch_inf.resume_name_len = len;
 954         cifsFile->srch_inf.presume_name = filename;
 955         return rc;
 956 }
 957
 958 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 959 {
 960         int rc = 0;
 961         int xid,i;
 962         struct cifs_sb_info *cifs_sb;
 963         struct cifsTconInfo *pTcon;
 964         struct cifsFileInfo *cifsFile = NULL;
 965         char * current_entry;
 966         int num_to_fill = 0;
 967         char * tmp_buf = NULL;
 968         char * end_of_smb;
 969         int max_len;
 970
 971         xid = GetXid();
 972
 973         if(file->f_dentry == NULL) {
 974                 FreeXid(xid);
 975                 return -EIO;
 976         }
 977
 978         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 979         pTcon = cifs_sb->tcon;
 980         if(pTcon == NULL)
 981                 return -EINVAL;
 982
 983         switch ((int) file->f_pos) {
 984         case 0:
 985                 if (filldir(direntry, ".", 1, file->f_pos,
 986                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 987                         cERROR(1, ("Filldir for current dir failed"));
 988                         rc = -ENOMEM;
 989                         break;
 990                 }
 991                 file->f_pos++;
 992         case 1:
 993                 if (filldir(direntry, "..", 2, file->f_pos,
 994                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 995                         cERROR(1, ("Filldir for parent dir failed"));
 996                         rc = -ENOMEM;
 997                         break;
 998                 }
 999                 file->f_pos++;
1000         default:
1001                 /* 1) If search is active,
1002                         is in current search buffer?
1003                         if it before then restart search
1004                         if after then keep searching till find it */
1005
1006                 if(file->private_data == NULL) {
1007                         rc = initiate_cifs_search(xid,file);
1008                         cFYI(1,("initiate cifs search rc %d",rc));
1009                         if(rc) {
1010                                 FreeXid(xid);
1011                                 return rc;
1012                         }
1013                 }
1014                 if(file->private_data == NULL) {
1015                         rc = -EINVAL;
1016                         FreeXid(xid);
1017                         return rc;
1018                 }
1019                 cifsFile = file->private_data;
1020                 if (cifsFile->srch_inf.endOfSearch) {
1021                         if(cifsFile->srch_inf.emptyDir) {
1022                                 cFYI(1, ("End of search, empty dir"));
1023                                 rc = 0;
1024                                 break;
1025                         }
1026                 } /* else {
1027                         cifsFile->invalidHandle = TRUE;
1028                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1029                 }
1030                 kfree(cifsFile->search_resume_name);
1031                 cifsFile->search_resume_name = NULL; */
1032
1033                 rc = find_cifs_entry(xid,pTcon, file,
1034                                 &current_entry,&num_to_fill);
1035                 if(rc) {
1036                         cFYI(1,("fce error %d",rc));
1037                         goto rddir2_exit;
1038                 } else if (current_entry != NULL) {
1039                         cFYI(1,("entry %lld found",file->f_pos));
1040                 } else {
1041                         cFYI(1,("could not find entry"));
1042                         goto rddir2_exit;
1043                 }
1044                 cFYI(1,("loop through %d times filling dir for net buf %p",
1045                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1046                 max_len = smbCalcSize((struct smb_hdr *)
1047                                 cifsFile->srch_inf.ntwrk_buf_start);
1048                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1049
1050                 /* To be safe - for UCS to UTF-8 with strings loaded
1051                 with the rare long characters alloc more to account for
1052                 such multibyte target UTF-8 characters. cifs_unicode.c,
1053                 which actually does the conversion, has the same limit */
1054                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1055                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1056                         if(current_entry == NULL) {
1057                                 /* evaluate whether this case is an error */
1058                                 cERROR(1,("past end of SMB num to fill %d i %d",
1059                                           num_to_fill, i));
1060                                 break;
1061                         }
1062                         /* if buggy server returns . and .. late do
1063                         we want to check for that here? */
1064                         rc = cifs_filldir(current_entry, file,
1065                                         filldir, direntry, tmp_buf, max_len);
1066                         file->f_pos++;
1067                         if(file->f_pos ==
1068                                 cifsFile->srch_inf.index_of_last_entry) {
1069                                 cFYI(1,("last entry in buf at pos %lld %s",
1070                                         file->f_pos,tmp_buf));
1071                                 cifs_save_resume_key(current_entry,cifsFile);
1072                                 break;
1073                         } else
1074                                 current_entry =
1075                                         nxt_dir_entry(current_entry, end_of_smb,
1076                                                 cifsFile->srch_inf.info_level);
1077                 }
1078                 kfree(tmp_buf);
1079                 break;
1080         } /* end switch */
1081
1082 rddir2_exit:
1083         FreeXid(xid);
1084         return rc;
1085 }