err.no Git - linux-2.6/blob - fs/cifs/readdir.c

   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004
   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 #include "cifsfs.h"
  33
  34 /* BB fixme - add debug wrappers around this function to disable it fixme BB */
  35 /* static void dump_cifs_file_struct(struct file *file, char *label)
  36 {
  37         struct cifsFileInfo * cf;
  38
  39         if(file) {
  40                 cf = file->private_data;
  41                 if(cf == NULL) {
  42                         cFYI(1,("empty cifs private file data"));
  43                         return;
  44                 }
  45                 if(cf->invalidHandle) {
  46                         cFYI(1,("invalid handle"));
  47                 }
  48                 if(cf->srch_inf.endOfSearch) {
  49                         cFYI(1,("end of search"));
  50                 }
  51                 if(cf->srch_inf.emptyDir) {
  52                         cFYI(1,("empty dir"));
  53                 }
  54
  55         }
  56 } */
  57
  58 /* Returns one if new inode created (which therefore needs to be hashed) */
  59 /* Might check in the future if inode number changed so we can rehash inode */
  60 static int construct_dentry(struct qstr *qstring, struct file *file,
  61         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  62 {
  63         struct dentry *tmp_dentry;
  64         struct cifs_sb_info *cifs_sb;
  65         struct cifsTconInfo *pTcon;
  66         int rc = 0;
  67
  68         cFYI(1, ("For %s ", qstring->name));
  69         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
  70         pTcon = cifs_sb->tcon;
  71
  72         qstring->hash = full_name_hash(qstring->name, qstring->len);
  73         tmp_dentry = d_lookup(file->f_dentry, qstring);
  74         if (tmp_dentry) {
  75                 cFYI(0, (" existing dentry with inode 0x%p", tmp_dentry->d_inode));
  76                 *ptmp_inode = tmp_dentry->d_inode;
  77 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
  78                 if(*ptmp_inode == NULL) {
  79                         *ptmp_inode = new_inode(file->f_dentry->d_sb);
  80                         if(*ptmp_inode == NULL)
  81                                 return rc;
  82                         rc = 1;
  83                         d_instantiate(tmp_dentry, *ptmp_inode);
  84                 }
  85         } else {
  86                 tmp_dentry = d_alloc(file->f_dentry, qstring);
  87                 if(tmp_dentry == NULL) {
  88                         cERROR(1,("Failed allocating dentry"));
  89                         *ptmp_inode = NULL;
  90                         return rc;
  91                 }
  92
  93                 *ptmp_inode = new_inode(file->f_dentry->d_sb);
  94                 tmp_dentry->d_op = &cifs_dentry_ops;
  95                 if(*ptmp_inode == NULL)
  96                         return rc;
  97                 rc = 1;
  98                 d_instantiate(tmp_dentry, *ptmp_inode);
  99                 d_rehash(tmp_dentry);
 100         }
 101
 102         tmp_dentry->d_time = jiffies;
 103         *pnew_dentry = tmp_dentry;
 104         return rc;
 105 }
 106
 107 static void fill_in_inode(struct inode *tmp_inode,
 108         FILE_DIRECTORY_INFO *pfindData, int *pobject_type)
 109 {
 110         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 111         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 112         __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 113         __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 114         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 115
 116         cifsInfo->cifsAttrs = attr;
 117         cifsInfo->time = jiffies;
 118
 119         /* Linux can not store file creation time unfortunately so ignore it */
 120         tmp_inode->i_atime =
 121             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 122         tmp_inode->i_mtime =
 123             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 124         tmp_inode->i_ctime =
 125             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 126         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 127         /* 2767 perms - indicate mandatory locking */
 128                 /* BB fill in uid and gid here? with help from winbind?
 129                    or retrieve from NTFS stream extended attribute */
 130         if (atomic_read(&cifsInfo->inUse) == 0) {
 131                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 132                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 133                 /* set default mode. will override for dirs below */
 134                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 135         }
 136
 137         cFYI(0,("CIFS FFIRST: Attributes came in as 0x%x",attr));
 138         if (attr & ATTR_DIRECTORY) {
 139                 *pobject_type = DT_DIR;
 140                 /* override default perms since we do not lock dirs */
 141                 if(atomic_read(&cifsInfo->inUse) == 0) {
 142                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 143                 }
 144                 tmp_inode->i_mode |= S_IFDIR;
 145 /* we no longer mark these because we could not follow them */
 146 /*        } else if (attr & ATTR_REPARSE) {
 147                 *pobject_type = DT_LNK;
 148                 tmp_inode->i_mode |= S_IFLNK; */
 149         } else {
 150                 *pobject_type = DT_REG;
 151                 tmp_inode->i_mode |= S_IFREG;
 152                 if (attr & ATTR_READONLY)
 153                         tmp_inode->i_mode &= ~(S_IWUGO);
 154         } /* could add code here - to validate if device or weird share type? */
 155
 156         /* can not fill in nlink here as in qpathinfo version and Unx search */
 157         if (atomic_read(&cifsInfo->inUse) == 0) {
 158                 atomic_set(&cifsInfo->inUse, 1);
 159         }
 160
 161         if (is_size_safe_to_change(cifsInfo)) {
 162                 /* can not safely change the file size here if the
 163                 client is writing to it due to potential races */
 164                 i_size_write(tmp_inode, end_of_file);
 165
 166         /* 512 bytes (2**9) is the fake blocksize that must be used */
 167         /* for this calculation, even though the reported blocksize is larger */
 168                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 169         }
 170
 171         if (allocation_size < end_of_file)
 172                 cFYI(1, ("May be sparse file, allocation less than file size"));
 173         cFYI(1,
 174              ("File Size %ld and blocks %ld and blocksize %ld",
 175               (unsigned long)tmp_inode->i_size, tmp_inode->i_blocks,
 176               tmp_inode->i_blksize));
 177         if (S_ISREG(tmp_inode->i_mode)) {
 178                 cFYI(1, (" File inode "));
 179                 tmp_inode->i_op = &cifs_file_inode_ops;
 180                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 181                         tmp_inode->i_fop = &cifs_file_direct_ops;
 182                 else
 183                         tmp_inode->i_fop = &cifs_file_ops;
 184                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 185         } else if (S_ISDIR(tmp_inode->i_mode)) {
 186                 cFYI(1, (" Directory inode"));
 187                 tmp_inode->i_op = &cifs_dir_inode_ops;
 188                 tmp_inode->i_fop = &cifs_dir_ops;
 189         } else if (S_ISLNK(tmp_inode->i_mode)) {
 190                 cFYI(1, (" Symbolic Link inode "));
 191                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 192         } else {
 193                 cFYI(1, (" Init special inode "));
 194                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 195                                    tmp_inode->i_rdev);
 196         }
 197 }
 198
 199 static void unix_fill_in_inode(struct inode *tmp_inode,
 200         FILE_UNIX_INFO *pfindData, int *pobject_type)
 201 {
 202         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 203         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 204
 205         __u32 type = le32_to_cpu(pfindData->Type);
 206         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 207         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 208         cifsInfo->time = jiffies;
 209         atomic_inc(&cifsInfo->inUse);
 210
 211         tmp_inode->i_atime =
 212             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 213         tmp_inode->i_mtime =
 214             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 215         tmp_inode->i_ctime =
 216             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 217
 218         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 219         if (type == UNIX_FILE) {
 220                 *pobject_type = DT_REG;
 221                 tmp_inode->i_mode |= S_IFREG;
 222         } else if (type == UNIX_SYMLINK) {
 223                 *pobject_type = DT_LNK;
 224                 tmp_inode->i_mode |= S_IFLNK;
 225         } else if (type == UNIX_DIR) {
 226                 *pobject_type = DT_DIR;
 227                 tmp_inode->i_mode |= S_IFDIR;
 228         } else if (type == UNIX_CHARDEV) {
 229                 *pobject_type = DT_CHR;
 230                 tmp_inode->i_mode |= S_IFCHR;
 231                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 232                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 233         } else if (type == UNIX_BLOCKDEV) {
 234                 *pobject_type = DT_BLK;
 235                 tmp_inode->i_mode |= S_IFBLK;
 236                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 237                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 238         } else if (type == UNIX_FIFO) {
 239                 *pobject_type = DT_FIFO;
 240                 tmp_inode->i_mode |= S_IFIFO;
 241         } else if (type == UNIX_SOCKET) {
 242                 *pobject_type = DT_SOCK;
 243                 tmp_inode->i_mode |= S_IFSOCK;
 244         }
 245
 246         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 247         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 248         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 249
 250         if (is_size_safe_to_change(cifsInfo)) {
 251                 /* can not safely change the file size here if the
 252                 client is writing to it due to potential races */
 253                 i_size_write(tmp_inode,end_of_file);
 254
 255         /* 512 bytes (2**9) is the fake blocksize that must be used */
 256         /* for this calculation, not the real blocksize */
 257                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 258         }
 259
 260         if (S_ISREG(tmp_inode->i_mode)) {
 261                 cFYI(1, ("File inode"));
 262                 tmp_inode->i_op = &cifs_file_inode_ops;
 263                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 264                         tmp_inode->i_fop = &cifs_file_direct_ops;
 265                 else
 266                         tmp_inode->i_fop = &cifs_file_ops;
 267                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 268         } else if (S_ISDIR(tmp_inode->i_mode)) {
 269                 cFYI(1, ("Directory inode"));
 270                 tmp_inode->i_op = &cifs_dir_inode_ops;
 271                 tmp_inode->i_fop = &cifs_dir_ops;
 272         } else if (S_ISLNK(tmp_inode->i_mode)) {
 273                 cFYI(1, ("Symbolic Link inode"));
 274                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 275 /* tmp_inode->i_fop = *//* do not need to set to anything */
 276         } else {
 277                 cFYI(1, ("Special inode"));
 278                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 279                                    tmp_inode->i_rdev);
 280         }
 281 }
 282
 283 static int initiate_cifs_search(const int xid, struct file *file)
 284 {
 285         int rc = 0;
 286         char * full_path;
 287         struct cifsFileInfo * cifsFile;
 288         struct cifs_sb_info *cifs_sb;
 289         struct cifsTconInfo *pTcon;
 290
 291         if(file->private_data == NULL) {
 292                 file->private_data =
 293                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 294         }
 295
 296         if(file->private_data == NULL) {
 297                 return -ENOMEM;
 298         } else {
 299                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 300         }
 301         cifsFile = file->private_data;
 302         cifsFile->invalidHandle = TRUE;
 303         cifsFile->srch_inf.endOfSearch = FALSE;
 304
 305         if(file->f_dentry == NULL)
 306                 return -ENOENT;
 307
 308         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 309         if(cifs_sb == NULL)
 310                 return -EINVAL;
 311
 312         pTcon = cifs_sb->tcon;
 313         if(pTcon == NULL)
 314                 return -EINVAL;
 315
 316         down(&file->f_dentry->d_sb->s_vfs_rename_sem);
 317         full_path = build_path_from_dentry(file->f_dentry);
 318         up(&file->f_dentry->d_sb->s_vfs_rename_sem);
 319
 320         if(full_path == NULL) {
 321                 return -ENOMEM;
 322         }
 323
 324         cFYI(1, ("Full path: %s start at: %lld ", full_path, file->f_pos));
 325
 326 ffirst_retry:
 327         /* test for Unix extensions */
 328         if (pTcon->ses->capabilities & CAP_UNIX) {
 329                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 330         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 331                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 332         } else /* not srvinos - BB fixme add check for backlevel? */ {
 333                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 334         }
 335
 336         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 337                 &cifsFile->netfid, &cifsFile->srch_inf,
 338                 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 339         if(rc == 0)
 340                 cifsFile->invalidHandle = FALSE;
 341         if((rc == -EOPNOTSUPP) &&
 342                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 343                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 344                 goto ffirst_retry;
 345         }
 346         kfree(full_path);
 347         return rc;
 348 }
 349
 350 /* return length of unicode string in bytes */
 351 static int cifs_unicode_bytelen(char *str)
 352 {
 353         int len;
 354         __le16 * ustr = (__le16 *)str;
 355
 356         for(len=0;len <= PATH_MAX;len++) {
 357                 if(ustr[len] == 0)
 358                         return len << 1;
 359         }
 360         cFYI(1,("Unicode string longer than PATH_MAX found"));
 361         return len << 1;
 362 }
 363
 364 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
 365 {
 366         char * new_entry;
 367         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 368
 369         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 370         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 371         /* validate that new_entry is not past end of SMB */
 372         if(new_entry >= end_of_smb) {
 373                 cFYI(1,("search entry %p began after end of SMB %p old entry %p",
 374                         new_entry,end_of_smb,old_entry));
 375                 return NULL;
 376         } else
 377                 return new_entry;
 378
 379 }
 380
 381 #define UNICODE_DOT cpu_to_le16(0x2e)
 382
 383 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 384 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 385 {
 386         int rc = 0;
 387         char * filename = NULL;
 388         int len = 0;
 389
 390         if(cfile->srch_inf.info_level == 0x202) {
 391                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 392                 filename = &pFindData->FileName[0];
 393                 if(cfile->srch_inf.unicode) {
 394                         len = cifs_unicode_bytelen(filename);
 395                 } else {
 396                         /* BB should we make this strnlen of PATH_MAX? */
 397                         len = strnlen(filename, 5);
 398                 }
 399         } else if(cfile->srch_inf.info_level == 0x101) {
 400                 FILE_DIRECTORY_INFO * pFindData =
 401                         (FILE_DIRECTORY_INFO *)current_entry;
 402                 filename = &pFindData->FileName[0];
 403                 len = le32_to_cpu(pFindData->FileNameLength);
 404         } else if(cfile->srch_inf.info_level == 0x102) {
 405                 FILE_FULL_DIRECTORY_INFO * pFindData =
 406                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 407                 filename = &pFindData->FileName[0];
 408                 len = le32_to_cpu(pFindData->FileNameLength);
 409         } else if(cfile->srch_inf.info_level == 0x105) {
 410                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 411                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 412                 filename = &pFindData->FileName[0];
 413                 len = le32_to_cpu(pFindData->FileNameLength);
 414         } else if(cfile->srch_inf.info_level == 0x104) {
 415                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 416                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 417                 filename = &pFindData->FileName[0];
 418                 len = le32_to_cpu(pFindData->FileNameLength);
 419         } else {
 420                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 421         }
 422
 423         if(filename) {
 424                 if(cfile->srch_inf.unicode) {
 425                         __le16 *ufilename = (__le16 *)filename;
 426                         if(len == 2) {
 427                                 /* check for . */
 428                                 if(ufilename[0] == UNICODE_DOT)
 429                                         rc = 1;
 430                         } else if(len == 4) {
 431                                 /* check for .. */
 432                                 if((ufilename[0] == UNICODE_DOT)
 433                                    &&(ufilename[1] == UNICODE_DOT))
 434                                         rc = 2;
 435                         }
 436                 } else /* ASCII */ {
 437                         if(len == 1) {
 438                                 if(filename[0] == '.')
 439                                         rc = 1;
 440                         } else if(len == 2) {
 441                                 if((filename[0] == '.') && (filename[1] == '.'))
 442                                         rc = 2;
 443                         }
 444                 }
 445         }
 446
 447         return rc;
 448 }
 449
 450 /* find the corresponding entry in the search */
 451 /* Note that the SMB server returns search entries for . and .. which
 452    complicates logic here if we choose to parse for them and we do not
 453    assume that they are located in the findfirst return buffer.*/
 454 /* We start counting in the buffer with entry 2 and increment for every
 455    entry (do not increment for . or .. entry) */
 456 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 457         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 458 {
 459         int rc = 0;
 460         int pos_in_buf = 0;
 461         loff_t first_entry_in_buffer;
 462         loff_t index_to_find = file->f_pos;
 463         struct cifsFileInfo * cifsFile = file->private_data;
 464         /* check if index in the buffer */
 465
 466         if((cifsFile == NULL) || (ppCurrentEntry == NULL) || (num_to_ret == NULL))
 467                 return -ENOENT;
 468
 469         *ppCurrentEntry = NULL;
 470         first_entry_in_buffer =
 471                 cifsFile->srch_inf.index_of_last_entry -
 472                         cifsFile->srch_inf.entries_in_buffer;
 473 /*      dump_cifs_file_struct(file, "In fce ");*/
 474         if(index_to_find < first_entry_in_buffer) {
 475                 /* close and restart search */
 476                 cFYI(1,("search backing up - close and restart search"));
 477                 cifsFile->invalidHandle = TRUE;
 478                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 479                 kfree(cifsFile->search_resume_name);
 480                 cifsFile->search_resume_name = NULL;
 481                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 482                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 483                         cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
 484                 }
 485                 rc = initiate_cifs_search(xid,file);
 486                 if(rc) {
 487                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 488                         return rc;
 489                 }
 490         }
 491
 492         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 493               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 494                 cFYI(1,("calling findnext2"));
 495                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid, &cifsFile->srch_inf);
 496                 if(rc)
 497                         return -ENOENT;
 498         }
 499         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 500                 /* we found the buffer that contains the entry */
 501                 /* scan and find it */
 502                 int i;
 503                 char * current_entry;
 504                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 505                         smbCalcSize((struct smb_hdr *)
 506                                 cifsFile->srch_inf.ntwrk_buf_start);
 507 /*      dump_cifs_file_struct(file,"found entry in fce "); */
 508                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 509                                         - cifsFile->srch_inf.entries_in_buffer;
 510                 pos_in_buf = index_to_find - first_entry_in_buffer;
 511                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 512                 current_entry = cifsFile->srch_inf.srch_entries_start;
 513                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 514                         /* go entry to next entry figuring out which we need to start with */
 515                         /* if( . or ..)
 516                                 skip */
 517                         rc = cifs_entry_is_dot(current_entry,cifsFile);
 518                         if(rc == 1) /* is . or .. so skip */ {
 519                                 cFYI(1,("Entry is .")); /* BB removeme BB */
 520                                 /* continue; */
 521                         } else if (rc == 2 ) {
 522                                 cFYI(1,("Entry is ..")); /* BB removeme BB */
 523                                 /* continue; */
 524                         }
 525                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
 526                 }
 527                 if((current_entry == NULL) && (i < pos_in_buf)) {
 528                         /* BB fixme - check if we should flag this error */
 529                         cERROR(1,("reached end of buf searching for pos in buf"
 530                           " %d index to find %lld rc %d",
 531                           pos_in_buf,index_to_find,rc));
 532                 }
 533                 rc = 0;
 534                 *ppCurrentEntry = current_entry;
 535         } else {
 536                 cFYI(1,("index not in buffer - could not findnext into it"));
 537                 return 0;
 538         }
 539
 540         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 541                 cFYI(1,("can not return entries when pos_in_buf beyond last entry"));
 542                 *num_to_ret = 0;
 543         } else
 544                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 545 /*      dump_cifs_file_struct(file, "end fce ");*/
 546
 547         return rc;
 548 }
 549
 550 /* inode num, inode type and filename returned */
 551 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 552         char *current_entry, __u16 level, unsigned int unicode,
 553         struct cifs_sb_info * cifs_sb, ino_t *pinum)
 554 {
 555         int rc = 0;
 556         unsigned int len = 0;
 557         char * filename;
 558         struct nls_table * nlt = cifs_sb->local_nls;
 559
 560         *pinum = 0;
 561
 562         if(level == SMB_FIND_FILE_UNIX) {
 563                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 564
 565                 filename = &pFindData->FileName[0];
 566                 if(unicode) {
 567                         len = cifs_unicode_bytelen(filename);
 568                 } else {
 569                         /* BB should we make this strnlen of PATH_MAX? */
 570                         len = strnlen(filename, PATH_MAX);
 571                 }
 572
 573                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 574                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 575                         *pinum = pFindData->UniqueId;
 576         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 577                 FILE_DIRECTORY_INFO * pFindData =
 578                         (FILE_DIRECTORY_INFO *)current_entry;
 579                 filename = &pFindData->FileName[0];
 580                 len = le32_to_cpu(pFindData->FileNameLength);
 581         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 582                 FILE_FULL_DIRECTORY_INFO * pFindData =
 583                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 584                 filename = &pFindData->FileName[0];
 585                 len = le32_to_cpu(pFindData->FileNameLength);
 586         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 587                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 588                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 589                 filename = &pFindData->FileName[0];
 590                 len = le32_to_cpu(pFindData->FileNameLength);
 591                 *pinum = pFindData->UniqueId;
 592         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 593                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 594                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 595                 filename = &pFindData->FileName[0];
 596                 len = le32_to_cpu(pFindData->FileNameLength);
 597         } else {
 598                 cFYI(1,("Unknown findfirst level %d",level));
 599                 return -EINVAL;
 600         }
 601         if(unicode) {
 602                 /* BB fixme - test with long names */
 603                 /* Note converted filename can be longer than in unicode */
 604                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 605                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 606                                         (__le16 *)filename, len/2, nlt);
 607                 else
 608                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 609                                         (wchar_t *)filename,len/2,nlt);
 610         } else {
 611                 pqst->name = filename;
 612                 pqst->len = len;
 613         }
 614         pqst->hash = full_name_hash(pqst->name,pqst->len);
 615 /*      cFYI(1,("filldir on %s",pqst->name));  */
 616         return rc;
 617 }
 618
 619 static int cifs_filldir(char *pfindEntry, struct file *file,
 620         filldir_t filldir, void *direntry, char *scratch_buf)
 621 {
 622         int rc = 0;
 623         struct qstr qstring;
 624         struct cifsFileInfo * pCifsF;
 625         unsigned obj_type;
 626         ino_t  inum;
 627         struct cifs_sb_info * cifs_sb;
 628         struct inode *tmp_inode;
 629         struct dentry *tmp_dentry;
 630
 631         /* get filename and len into qstring */
 632         /* get dentry */
 633         /* decide whether to create and populate ionde */
 634         if((direntry == NULL) || (file == NULL))
 635                 return -EINVAL;
 636
 637         pCifsF = file->private_data;
 638
 639         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 640                 return -ENOENT;
 641
 642         if(file->f_dentry == NULL)
 643                 return -ENOENT;
 644
 645         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 646
 647         qstring.name = scratch_buf;
 648         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 649                         pCifsF->srch_inf.info_level,
 650                         pCifsF->srch_inf.unicode,cifs_sb,
 651                         &inum /* returned */);
 652
 653         if(rc)
 654                 return rc;
 655
 656         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 657         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 658                 return -ENOMEM;
 659
 660         if(rc) {
 661                 /* inode created, we need to hash it with right inode number */
 662                 if(inum != 0) {
 663                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 664                         tmp_inode->i_ino = inum;
 665                 }
 666                 insert_inode_hash(tmp_inode);
 667         }
 668
 669         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 670                 unix_fill_in_inode(tmp_inode,(FILE_UNIX_INFO *)pfindEntry,&obj_type);
 671         } else {
 672                 fill_in_inode(tmp_inode,(FILE_DIRECTORY_INFO *)pfindEntry,&obj_type);
 673         }
 674
 675         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,tmp_inode->i_ino,obj_type);
 676         if(rc) {
 677                 cFYI(1,("filldir rc = %d",rc));
 678         }
 679
 680         dput(tmp_dentry);
 681         return rc;
 682 }
 683
 684 static int cifs_save_resume_key(const char *current_entry,
 685         struct cifsFileInfo *cifsFile)
 686 {
 687         int rc = 0;
 688         unsigned int len = 0;
 689         __u16 level;
 690         char * filename;
 691
 692         if((cifsFile == NULL) || (current_entry == NULL))
 693                 return -EINVAL;
 694
 695         level = cifsFile->srch_inf.info_level;
 696
 697         if(level == SMB_FIND_FILE_UNIX) {
 698                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 699
 700                 filename = &pFindData->FileName[0];
 701                 if(cifsFile->srch_inf.unicode) {
 702                         len = cifs_unicode_bytelen(filename);
 703                 } else {
 704                         /* BB should we make this strnlen of PATH_MAX? */
 705                         len = strnlen(filename, PATH_MAX);
 706                 }
 707                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 708         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 709                 FILE_DIRECTORY_INFO * pFindData =
 710                         (FILE_DIRECTORY_INFO *)current_entry;
 711                 filename = &pFindData->FileName[0];
 712                 len = le32_to_cpu(pFindData->FileNameLength);
 713                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 714         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 715                 FILE_FULL_DIRECTORY_INFO * pFindData =
 716                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 717                 filename = &pFindData->FileName[0];
 718                 len = le32_to_cpu(pFindData->FileNameLength);
 719                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 720         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 721                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 722                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 723                 filename = &pFindData->FileName[0];
 724                 len = le32_to_cpu(pFindData->FileNameLength);
 725                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 726         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 727                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 728                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 729                 filename = &pFindData->FileName[0];
 730                 len = le32_to_cpu(pFindData->FileNameLength);
 731                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 732         } else {
 733                 cFYI(1,("Unknown findfirst level %d",level));
 734                 return -EINVAL;
 735         }
 736         cifsFile->srch_inf.resume_name_len = len;
 737         cifsFile->srch_inf.presume_name = filename;
 738         return rc;
 739 }
 740
 741 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 742 {
 743         int rc = 0;
 744         int xid,i;
 745         struct cifs_sb_info *cifs_sb;
 746         struct cifsTconInfo *pTcon;
 747         struct cifsFileInfo *cifsFile = NULL;
 748         char * current_entry;
 749         int num_to_fill = 0;
 750         char * tmp_buf = NULL;
 751         char * end_of_smb;
 752
 753         xid = GetXid();
 754
 755         if(file->f_dentry == NULL) {
 756                 FreeXid(xid);
 757                 return -EIO;
 758         }
 759 /*      dump_cifs_file_struct(file, "Begin rdir "); */
 760
 761         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 762         pTcon = cifs_sb->tcon;
 763         if(pTcon == NULL)
 764                 return -EINVAL;
 765
 766 /*      cFYI(1,("readdir2 pos: %lld",file->f_pos)); */
 767
 768         switch ((int) file->f_pos) {
 769         case 0:
 770                 /*if (filldir(direntry, ".", 1, file->f_pos,
 771                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 772                         cERROR(1, ("Filldir for current dir failed "));
 773                         rc = -ENOMEM;
 774                         break;
 775                 }
 776                 file->f_pos++; */
 777         case 1:
 778                 /* if (filldir(direntry, "..", 2, file->f_pos,
 779                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 780                         cERROR(1, ("Filldir for parent dir failed "));
 781                         rc = -ENOMEM;
 782                         break;
 783                 }
 784                 file->f_pos++; */
 785         case 2:
 786                 /* 1) If search is active,
 787                         is in current search buffer?
 788                         if it before then restart search
 789                         if after then keep searching till find it */
 790
 791                 if(file->private_data == NULL) {
 792                         rc = initiate_cifs_search(xid,file);
 793                         cFYI(1,("initiate cifs search rc %d",rc));
 794                         if(rc) {
 795                                 FreeXid(xid);
 796                                 return rc;
 797                         }
 798                 }
 799         default:
 800                 if(file->private_data == NULL) {
 801                         rc = -EINVAL;
 802                         FreeXid(xid);
 803                         return rc;
 804                 }
 805                 cifsFile = file->private_data;
 806                 if (cifsFile->srch_inf.endOfSearch) {
 807                         if(cifsFile->srch_inf.emptyDir) {
 808                                 cFYI(1, ("End of search, empty dir"));
 809                                 rc = 0;
 810                                 break;
 811                         }
 812                 } /* else {
 813                         cifsFile->invalidHandle = TRUE;
 814                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 815                 }
 816                 kfree(cifsFile->search_resume_name);
 817                 cifsFile->search_resume_name = NULL; */
 818
 819                 /* BB account for . and .. in f_pos as special case */
 820                 /* dump_cifs_file_struct(file, "rdir after default ");*/
 821
 822                 rc = find_cifs_entry(xid,pTcon, file,
 823                                 &current_entry,&num_to_fill);
 824                 if(rc) {
 825                         cFYI(1,("fce error %d",rc));
 826                         goto rddir2_exit;
 827                 } else if (current_entry != NULL) {
 828                         cFYI(1,("entry %lld found",file->f_pos));
 829                 } else {
 830                         cFYI(1,("could not find entry"));
 831                         goto rddir2_exit;
 832                 }
 833                 cFYI(1,("loop through %d times filling dir for net buf %p",
 834                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
 835                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 836                         smbCalcSize((struct smb_hdr *)
 837                                     cifsFile->srch_inf.ntwrk_buf_start);
 838                 /* To be safe - for UCS to UTF-8 with strings loaded
 839                 with the rare long characters alloc more to account for
 840                 such multibyte target UTF-8 characters. cifs_unicode.c,
 841                 which actually does the conversion, has the same limit */
 842                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
 843                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
 844                         if(current_entry == NULL) {
 845                                 /* evaluate whether this case is an error */
 846                                 cERROR(1,("past end of SMB num to fill %d i %d",
 847                                           num_to_fill, i));
 848                                 break;
 849                         }
 850
 851                         rc = cifs_filldir(current_entry, file,
 852                                         filldir, direntry,tmp_buf);
 853                         file->f_pos++;
 854                         if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
 855                                 cFYI(1,("last entry in buf at pos %lld %s",
 856                                         file->f_pos,tmp_buf)); /* BB removeme BB */
 857                                 cifs_save_resume_key(current_entry,cifsFile);
 858                                 break;
 859                         } else
 860                                 current_entry = nxt_dir_entry(current_entry,end_of_smb);
 861                 }
 862                 kfree(tmp_buf);
 863                 break;
 864         } /* end switch */
 865
 866 rddir2_exit:
 867         /* dump_cifs_file_struct(file, "end rdir ");  */
 868         FreeXid(xid);
 869         return rc;
 870 }