fs/cifs/readdir.c

   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <linux/fs.h>
  24 #include <linux/stat.h>
  25 #include <linux/smp_lock.h>
  26 #include "cifspdu.h"
  27 #include "cifsglob.h"
  28 #include "cifsproto.h"
  29 #include "cifs_unicode.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_fs_sb.h"
  32
  33 extern int CIFSFindFirst2(const int xid, struct cifsTconInfo *tcon,
  34             const char *searchName, const struct nls_table *nls_codepage,
  35             __u16 *searchHandle, struct cifs_search_info * psrch_inf);
  36
  37 extern int CIFSFindNext2(const int xid, struct cifsTconInfo *tcon,
  38             __u16 searchHandle, struct cifs_search_info * psrch_inf);
  39
  40 extern int construct_dentry(struct qstr *qstring, struct file *file,
  41                  struct inode **ptmp_inode, struct dentry **pnew_dentry);
  42
  43 extern void fill_in_inode(struct inode *tmp_inode,
  44               FILE_DIRECTORY_INFO * pfindData, int *pobject_type);
  45
  46 extern void unix_fill_in_inode(struct inode *tmp_inode,
  47               FILE_UNIX_INFO * pfindData, int *pobject_type);
  48
  49
  50 /* BB fixme - add debug wrappers around this function to disable it fixme BB */
  51 /* static void dump_cifs_file_struct(struct file * file, char * label)
  52 {
  53         struct cifsFileInfo * cf;
  54
  55         if(file) {
  56                 cf = (struct cifsFileInfo *)file->private_data;
  57                 if(cf == NULL) {
  58                         cFYI(1,("empty cifs private file data"));
  59                         return;
  60                 }
  61                 if(cf->invalidHandle) {
  62                         cFYI(1,("invalid handle"));
  63                 }
  64                 if(cf->srch_inf.endOfSearch) {
  65                         cFYI(1,("end of search"));
  66                 }
  67                 if(cf->srch_inf.emptyDir) {
  68                         cFYI(1,("empty dir"));
  69                 }
  70
  71         }
  72 } */
  73
  74 static int initiate_cifs_search(const int xid, struct file * file)
  75 {
  76         int rc = 0;
  77         char * full_path;
  78         struct cifsFileInfo * cifsFile;
  79         struct cifs_sb_info *cifs_sb;
  80         struct cifsTconInfo *pTcon;
  81
  82         if(file->private_data == NULL) {
  83                 file->private_data =
  84                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
  85         }
  86
  87         if(file->private_data == NULL) {
  88                 return -ENOMEM;
  89         } else {
  90                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
  91         }
  92         cifsFile = (struct cifsFileInfo *)file->private_data;
  93         cifsFile->invalidHandle = TRUE;
  94         cifsFile->srch_inf.endOfSearch = FALSE;
  95
  96         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
  97         if(cifs_sb == NULL)
  98                 return -EINVAL;
  99
 100         pTcon = cifs_sb->tcon;
 101         if(pTcon == NULL)
 102                 return -EINVAL;
 103
 104         if(file->f_dentry == NULL)
 105                 return -ENOENT;
 106
 107         down(&file->f_dentry->d_sb->s_vfs_rename_sem);
 108         full_path = build_wildcard_path_from_dentry(file->f_dentry);
 109         up(&file->f_dentry->d_sb->s_vfs_rename_sem);
 110
 111         if(full_path == NULL) {
 112                 return -ENOMEM;
 113         }
 114
 115         cFYI(1, ("Full path: %s start at: %lld ", full_path, file->f_pos));
 116
 117         /* test for Unix extensions */
 118         if (pTcon->ses->capabilities & CAP_UNIX) {
 119                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 120         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 121                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 122         } else /* not srvinos - BB fixme add check for backlevel? */ {
 123                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 124         }
 125
 126         rc = CIFSFindFirst2(xid, pTcon,full_path,cifs_sb->local_nls,
 127                 &cifsFile->netfid, &cifsFile->srch_inf);
 128         if(rc == 0)
 129                 cifsFile->invalidHandle = FALSE;
 130         if(full_path)
 131                 kfree(full_path);
 132         return rc;
 133 }
 134
 135 /* return length of unicode string in bytes */
 136 static int cifs_unicode_bytelen(char * str)
 137 {
 138         int len;
 139         __le16 * ustr = (__le16 *)str;
 140
 141         for(len=0;len <= PATH_MAX;len++) {
 142                 if(ustr[len] == 0)
 143                         return len << 1;
 144         }
 145         cFYI(1,("Unicode string longer than PATH_MAX found"));
 146         return len << 1;
 147 }
 148
 149 static char * nxt_dir_entry(char * old_entry, char * end_of_smb)
 150 {
 151         char * new_entry;
 152         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 153
 154         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 155         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 156         /* validate that new_entry is not past end of SMB */
 157         if(new_entry >= end_of_smb) {
 158                 cFYI(1,("search entry %p began after end of SMB %p old entry %p",
 159                         new_entry,end_of_smb,old_entry));
 160                 return NULL;
 161         } else
 162                 return new_entry;
 163
 164 }
 165
 166 #define UNICODE_DOT cpu_to_le16(0x2e)
 167
 168 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 169 static int cifs_entry_is_dot(char * current_entry, struct cifsFileInfo * cfile)
 170 {
 171         int rc = 0;
 172         char * filename = NULL;
 173         int len = 0;
 174
 175         if(cfile->srch_inf.info_level == 0x202) {
 176                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 177                 filename = &pFindData->FileName[0];
 178                 if(cfile->srch_inf.unicode) {
 179                         len = cifs_unicode_bytelen(filename);
 180                 } else {
 181                         /* BB should we make this strnlen of PATH_MAX? */
 182                         len = strnlen(filename, 5);
 183                 }
 184         } else if(cfile->srch_inf.info_level == 0x101) {
 185                 FILE_DIRECTORY_INFO * pFindData =
 186                         (FILE_DIRECTORY_INFO *)current_entry;
 187                 filename = &pFindData->FileName[0];
 188                 len = le32_to_cpu(pFindData->FileNameLength);
 189         } else if(cfile->srch_inf.info_level == 0x102) {
 190                 FILE_FULL_DIRECTORY_INFO * pFindData =
 191                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 192                 filename = &pFindData->FileName[0];
 193                 len = le32_to_cpu(pFindData->FileNameLength);
 194         } else if(cfile->srch_inf.info_level == 0x105) {
 195                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 196                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 197                 filename = &pFindData->FileName[0];
 198                 len = le32_to_cpu(pFindData->FileNameLength);
 199         } else if(cfile->srch_inf.info_level == 0x104) {
 200                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 201                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 202                 filename = &pFindData->FileName[0];
 203                 len = le32_to_cpu(pFindData->FileNameLength);
 204         } else {
 205                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 206         }
 207
 208         if(filename) {
 209                 if(cfile->srch_inf.unicode) {
 210                         __le16 *ufilename = (__le16 *)filename;
 211                         if(len == 2) {
 212                                 /* check for . */
 213                                 if(ufilename[0] == UNICODE_DOT)
 214                                         rc = 1;
 215                         } else if(len == 4) {
 216                                 /* check for .. */
 217                                 if((ufilename[0] == UNICODE_DOT)
 218                                    &&(ufilename[1] == UNICODE_DOT))
 219                                         rc = 2;
 220                         }
 221                 } else /* ASCII */ {
 222                         if(len == 1) {
 223                                 if(filename[0] == '.')
 224                                         rc = 1;
 225                         } else if(len == 2) {
 226                                 if((filename[0] == '.') && (filename[1] == '.'))
 227                                         rc = 2;
 228                         }
 229                 }
 230         }
 231
 232         return rc;
 233 }
 234
 235 /* find the corresponding entry in the search */
 236 /* Note that the SMB server returns search entries for . and .. which
 237    complicates logic here if we choose to parse for them and we do not
 238    assume that they are located in the findfirst return buffer.*/
 239 /* We start counting in the buffer with entry 2 and increment for every
 240    entry (do not increment for . or .. entry) */
 241 static int find_cifs_entry(const int xid, struct cifsTconInfo * pTcon,
 242                 struct file * file, char ** ppCurrentEntry,int * num_to_ret)
 243 {
 244         int rc = 0;
 245         int pos_in_buf = 0;
 246         loff_t first_entry_in_buffer;
 247         loff_t index_to_find = file->f_pos;
 248         struct cifsFileInfo * cifsFile = (struct cifsFileInfo *)file->private_data;
 249         /* check if index in the buffer */
 250
 251         if((cifsFile == NULL) || (ppCurrentEntry == NULL) || (num_to_ret == NULL))
 252                 return -ENOENT;
 253
 254         *ppCurrentEntry = NULL;
 255         first_entry_in_buffer =
 256                 cifsFile->srch_inf.index_of_last_entry -
 257                         cifsFile->srch_inf.entries_in_buffer;
 258 /*      dump_cifs_file_struct(file, "In fce ");*/
 259         if(index_to_find < first_entry_in_buffer) {
 260                 /* close and restart search */
 261                 cFYI(1,("search backing up - close and restart search"));
 262                 cifsFile->invalidHandle = TRUE;
 263                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 264                 if(cifsFile->search_resume_name) {
 265                         kfree(cifsFile->search_resume_name);
 266                         cifsFile->search_resume_name = NULL;
 267                 }
 268                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 269                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 270                         cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
 271                 }
 272                 rc = initiate_cifs_search(xid,file);
 273                 if(rc) {
 274                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 275                         return rc;
 276                 }
 277         }
 278
 279         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 280               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 281                 cFYI(1,("calling findnext2"));
 282                 rc = CIFSFindNext2(xid,pTcon,cifsFile->netfid, &cifsFile->srch_inf);
 283                 if(rc)
 284                         return -ENOENT;
 285         }
 286         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 287                 /* we found the buffer that contains the entry */
 288                 /* scan and find it */
 289                 int i;
 290                 char * current_entry;
 291                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 292                         smbCalcSize((struct smb_hdr *)cifsFile->srch_inf.ntwrk_buf_start);
 293 /*      dump_cifs_file_struct(file,"found entry in fce "); */
 294                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry -
 295                         cifsFile->srch_inf.entries_in_buffer;
 296                 pos_in_buf = index_to_find - first_entry_in_buffer;
 297                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 298                 current_entry = cifsFile->srch_inf.srch_entries_start;
 299                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 300                         /* go entry to next entry figuring out which we need to start with */
 301                         /* if( . or ..)
 302                                 skip */
 303                         rc = cifs_entry_is_dot(current_entry,cifsFile);
 304                         if(rc == 1) /* is . or .. so skip */ {
 305                                 cFYI(1,("Entry is .")); /* BB removeme BB */
 306                                 /* continue; */
 307                         } else if (rc == 2 ) {
 308                                 cFYI(1,("Entry is ..")); /* BB removeme BB */
 309                                 /* continue; */
 310                         }
 311                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
 312                 }
 313                 if((current_entry == NULL) && (i < pos_in_buf)) {
 314                         cERROR(1,("reached end of buf searching for pos in buf %d index to find %lld rc %d",pos_in_buf,index_to_find,rc)); /* BB removeme BB */
 315                 }
 316                 rc = 0;
 317                 *ppCurrentEntry = current_entry;
 318         } else {
 319                 cFYI(1,("index not in buffer - could not findnext into it"));
 320                 return 0;
 321         }
 322
 323         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 324                 cFYI(1,("can not return entries when pos_in_buf beyond last entry"));
 325                 *num_to_ret = 0;
 326         } else
 327                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 328 /*      dump_cifs_file_struct(file, "end fce ");*/
 329
 330         return rc;
 331 }
 332
 333 /* inode num, inode type and filename returned */
 334 static int cifs_get_name_from_search_buf(struct qstr * pqst,char * current_entry,
 335                         __u16 level,unsigned int unicode,struct nls_table * nlt,
 336                         ino_t * pinum)
 337 {
 338         int rc = 0;
 339         unsigned int len = 0;
 340         char * filename;
 341
 342         *pinum = 0;
 343
 344         if(level == SMB_FIND_FILE_UNIX) {
 345                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 346
 347                 filename = &pFindData->FileName[0];
 348                 if(unicode) {
 349                         len = cifs_unicode_bytelen(filename);
 350                 } else {
 351                         /* BB should we make this strnlen of PATH_MAX? */
 352                         len = strnlen(filename, PATH_MAX);
 353                 }
 354
 355                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 356                 *pinum = pFindData->UniqueId;
 357         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 358                 FILE_DIRECTORY_INFO * pFindData =
 359                         (FILE_DIRECTORY_INFO *)current_entry;
 360                 filename = &pFindData->FileName[0];
 361                 len = le32_to_cpu(pFindData->FileNameLength);
 362         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 363                 FILE_FULL_DIRECTORY_INFO * pFindData =
 364                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 365                 filename = &pFindData->FileName[0];
 366                 len = le32_to_cpu(pFindData->FileNameLength);
 367         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 368                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 369                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 370                 filename = &pFindData->FileName[0];
 371                 len = le32_to_cpu(pFindData->FileNameLength);
 372                 *pinum = pFindData->UniqueId;
 373         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 374                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 375                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 376                 filename = &pFindData->FileName[0];
 377                 len = le32_to_cpu(pFindData->FileNameLength);
 378         } else {
 379                 cFYI(1,("Unknown findfirst level %d",level));
 380                 return -EINVAL;
 381         }
 382         if(unicode) {
 383                 /* BB fixme - test with long names */
 384                 /* Note converted filename can be longer than in unicode */
 385                 pqst->len = cifs_strfromUCS_le((char *)pqst->name,(wchar_t *)filename,len/2,nlt);
 386         } else {
 387                 pqst->name = filename;
 388                 pqst->len = len;
 389         }
 390         pqst->hash = full_name_hash(pqst->name,pqst->len);
 391 /*      cFYI(1,("filldir on %s",pqst->name));  */
 392         return rc;
 393 }
 394
 395
 396 static int
 397 cifs_filldir2(char * pfindEntry, struct file *file,
 398                           filldir_t filldir, void *direntry,char * scratch_buf)
 399 {
 400         int rc = 0;
 401         struct qstr qstring;
 402         struct cifsFileInfo * pCifsF;
 403         unsigned obj_type;
 404         ino_t  inum;
 405         struct cifs_sb_info * cifs_sb;
 406         struct inode *tmp_inode;
 407         struct dentry *tmp_dentry;
 408
 409         /* get filename and len into qstring */
 410         /* get dentry */
 411         /* decide whether to create and populate ionde */
 412         if((direntry == NULL) || (file == NULL))
 413                 return -EINVAL;
 414
 415         pCifsF = file->private_data;
 416
 417         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 418                 return -ENOENT;
 419
 420         if(file->f_dentry == NULL)
 421                 return -ENOENT;
 422
 423         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 424
 425         qstring.name = scratch_buf;
 426         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 427                         pCifsF->srch_inf.info_level,
 428                         pCifsF->srch_inf.unicode,cifs_sb->local_nls,
 429                         &inum /* returned */);
 430
 431         if(rc)
 432                 return rc;
 433
 434         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 435         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 436                 return -ENOMEM;
 437
 438         if(rc) {
 439                 /* inode created, we need to hash it with right inode number */
 440                 if(inum != 0) {
 441                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 442                         tmp_inode->i_ino = inum;
 443                 }
 444                 insert_inode_hash(tmp_inode);
 445         }
 446
 447         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 448                 unix_fill_in_inode(tmp_inode,(FILE_UNIX_INFO *)pfindEntry,&obj_type);
 449         } else {
 450                 fill_in_inode(tmp_inode,(FILE_DIRECTORY_INFO *)pfindEntry,&obj_type);
 451         }
 452
 453         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,tmp_inode->i_ino,obj_type);
 454         if(rc) {
 455                 cFYI(1,("filldir rc = %d",rc));
 456         }
 457
 458         dput(tmp_dentry);
 459         return rc;
 460 }
 461
 462 int cifs_save_resume_key(const char * current_entry,struct cifsFileInfo * cifsFile)
 463 {
 464         int rc = 0;
 465         unsigned int len = 0;
 466         __u16 level;
 467         char * filename;
 468
 469         if((cifsFile == NULL) || (current_entry == NULL))
 470                 return -EINVAL;
 471
 472         level = cifsFile->srch_inf.info_level;
 473
 474         if(level == SMB_FIND_FILE_UNIX) {
 475                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 476
 477                 filename = &pFindData->FileName[0];
 478                 if(cifsFile->srch_inf.unicode) {
 479                         len = cifs_unicode_bytelen(filename);
 480                 } else {
 481                         /* BB should we make this strnlen of PATH_MAX? */
 482                         len = strnlen(filename, PATH_MAX);
 483                 }
 484                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 485         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 486                 FILE_DIRECTORY_INFO * pFindData =
 487                         (FILE_DIRECTORY_INFO *)current_entry;
 488                 filename = &pFindData->FileName[0];
 489                 len = le32_to_cpu(pFindData->FileNameLength);
 490                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 491         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 492                 FILE_FULL_DIRECTORY_INFO * pFindData =
 493                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 494                 filename = &pFindData->FileName[0];
 495                 len = le32_to_cpu(pFindData->FileNameLength);
 496                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 497         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 498                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 499                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 500                 filename = &pFindData->FileName[0];
 501                 len = le32_to_cpu(pFindData->FileNameLength);
 502                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 503         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 504                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 505                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 506                 filename = &pFindData->FileName[0];
 507                 len = le32_to_cpu(pFindData->FileNameLength);
 508                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 509         } else {
 510                 cFYI(1,("Unknown findfirst level %d",level));
 511                 return -EINVAL;
 512         }
 513         cifsFile->srch_inf.resume_name_len = len;
 514         cifsFile->srch_inf.presume_name = filename;
 515         return rc;
 516 }
 517
 518 int cifs_readdir2(struct file *file, void *direntry, filldir_t filldir)
 519 {
 520         int rc = 0;
 521         int xid,i;
 522         struct cifs_sb_info *cifs_sb;
 523         struct cifsTconInfo *pTcon;
 524         struct cifsFileInfo *cifsFile = NULL;
 525         char * current_entry;
 526         int num_to_fill = 0;
 527         char * tmp_buf = NULL;
 528         char * end_of_smb;
 529
 530         xid = GetXid();
 531
 532         if(file->f_dentry == NULL) {
 533                 FreeXid(xid);
 534                 return -EIO;
 535         }
 536 /*      dump_cifs_file_struct(file, "Begin rdir "); */
 537
 538         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 539         pTcon = cifs_sb->tcon;
 540         if(pTcon == NULL)
 541                 return -EINVAL;
 542
 543 /*      cFYI(1,("readdir2 pos: %lld",file->f_pos)); */
 544
 545         switch ((int) file->f_pos) {
 546         case 0:
 547                 /*if (filldir(direntry, ".", 1, file->f_pos,
 548                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 549                         cERROR(1, ("Filldir for current dir failed "));
 550                         rc = -ENOMEM;
 551                         break;
 552                 }
 553                 file->f_pos++; */
 554         case 1:
 555                 /* if (filldir(direntry, "..", 2, file->f_pos,
 556                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 557                         cERROR(1, ("Filldir for parent dir failed "));
 558                         rc = -ENOMEM;
 559                         break;
 560                 }
 561                 file->f_pos++; */
 562         case 2:
 563                 /* 1) If search is active,
 564                         is in current search buffer?
 565                         if it before then restart search
 566                         if after then keep searching till find it */
 567
 568                 if(file->private_data == NULL) {
 569                         rc = initiate_cifs_search(xid,file);
 570                         cFYI(1,("initiate cifs search rc %d",rc));
 571                         if(rc) {
 572                                 FreeXid(xid);
 573                                 return rc;
 574                         }
 575                 }
 576         default:
 577                 if(file->private_data == NULL) {
 578                         rc = -EINVAL;
 579                         FreeXid(xid);
 580                         return rc;
 581                 }
 582                 cifsFile = (struct cifsFileInfo *) file->private_data;
 583                 if (cifsFile->srch_inf.endOfSearch) {
 584                         if(cifsFile->srch_inf.emptyDir) {
 585                                 cFYI(1, ("End of search, empty dir"));
 586                                 rc = 0;
 587                                 break;
 588                         }
 589                 } /* else {
 590                         cifsFile->invalidHandle = TRUE;
 591                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 592                 }
 593                 if(cifsFile->search_resume_name) {
 594                         kfree(cifsFile->search_resume_name);
 595                         cifsFile->search_resume_name = NULL;
 596                 } */
 597 /* BB account for . and .. in f_pos */
 598                 /* dump_cifs_file_struct(file, "rdir after default ");*/
 599
 600                 rc = find_cifs_entry(xid,pTcon, file,
 601                                 &current_entry,&num_to_fill);
 602                 if(rc) {
 603                         cFYI(1,("fce error %d",rc));
 604                         goto rddir2_exit;
 605                 } else if (current_entry != NULL) {
 606                         cFYI(1,("entry %lld found",file->f_pos));
 607                 } else {
 608                         cFYI(1,("could not find entry"));
 609                         goto rddir2_exit;
 610                 }
 611                 cFYI(1,("loop through %d times filling dir for net buf %p",
 612                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
 613                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 614                         smbCalcSize((struct smb_hdr *)cifsFile->srch_inf.ntwrk_buf_start);
 615                 tmp_buf = kmalloc(NAME_MAX+1,GFP_KERNEL);
 616                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
 617                         if(current_entry == NULL) {
 618                                 cERROR(1,("beyond end of smb with num to fill %d i %d",num_to_fill,i)); /* BB removeme BB */
 619                                 break;
 620                         }
 621 /*                      if((!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) ||
 622                            (cifsFile->srch_inf.info_level != something that supports server inodes)) {
 623                                 create dentry
 624                                 create inode
 625                                 fill in inode new_inode (which makes number locally)
 626                         }
 627                         also create local inode for per reasons unless new mount parm says otherwise */
 628                         rc = cifs_filldir2(current_entry, file,
 629                                         filldir, direntry,tmp_buf);
 630                         file->f_pos++;
 631                         if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
 632                                 cFYI(1,("last entry in buf at pos %lld %s",file->f_pos,tmp_buf)); /* BB removeme BB */
 633                                 cifs_save_resume_key(current_entry,cifsFile);
 634                                 break;
 635                         } else
 636                                 current_entry = nxt_dir_entry(current_entry,end_of_smb);
 637                 }
 638                 if(tmp_buf != NULL)
 639                         kfree(tmp_buf);
 640                 break;
 641         } /* end switch */
 642
 643 rddir2_exit:
 644         /* dump_cifs_file_struct(file, "end rdir ");  */
 645         FreeXid(xid);
 646         return rc;
 647 }
 648