fs/cifs/readdir.c

   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004, 2005
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <linux/fs.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/stat.h>
  26 #include <linux/smp_lock.h>
  27 #include "cifspdu.h"
  28 #include "cifsglob.h"
  29 #include "cifsproto.h"
  30 #include "cifs_unicode.h"
  31 #include "cifs_debug.h"
  32 #include "cifs_fs_sb.h"
  33 #include "cifsfs.h"
  34
  35 #ifdef CONFIG_CIFS_DEBUG2
  36 static void dump_cifs_file_struct(struct file *file, char *label)
  37 {
  38         struct cifsFileInfo * cf;
  39
  40         if(file) {
  41                 cf = file->private_data;
  42                 if(cf == NULL) {
  43                         cFYI(1,("empty cifs private file data"));
  44                         return;
  45                 }
  46                 if(cf->invalidHandle) {
  47                         cFYI(1,("invalid handle"));
  48                 }
  49                 if(cf->srch_inf.endOfSearch) {
  50                         cFYI(1,("end of search"));
  51                 }
  52                 if(cf->srch_inf.emptyDir) {
  53                         cFYI(1,("empty dir"));
  54                 }
  55
  56         }
  57 }
  58 #endif /* DEBUG2 */
  59
  60 /* Returns one if new inode created (which therefore needs to be hashed) */
  61 /* Might check in the future if inode number changed so we can rehash inode */
  62 static int construct_dentry(struct qstr *qstring, struct file *file,
  63         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  64 {
  65         struct dentry *tmp_dentry;
  66         struct cifs_sb_info *cifs_sb;
  67         struct cifsTconInfo *pTcon;
  68         int rc = 0;
  69
  70         cFYI(1, ("For %s", qstring->name));
  71         cifs_sb = CIFS_SB(file->f_path.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_path.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_path.dentry->d_sb);
  82                         if(*ptmp_inode == NULL)
  83                                 return rc;
  84                         rc = 1;
  85                 }
  86         } else {
  87                 tmp_dentry = d_alloc(file->f_path.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_path.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 AdjustForTZ(struct cifsTconInfo * tcon, struct inode * inode)
 110 {
 111         if((tcon) && (tcon->ses) && (tcon->ses->server)) {
 112                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
 113                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
 114                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
 115         }
 116         return;
 117 }
 118
 119
 120 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
 121                 char * buf, int *pobject_type, int isNewInode)
 122 {
 123         loff_t local_size;
 124         struct timespec local_mtime;
 125
 126         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 127         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 128         __u32 attr;
 129         __u64 allocation_size;
 130         __u64 end_of_file;
 131
 132         /* save mtime and size */
 133         local_mtime = tmp_inode->i_mtime;
 134         local_size  = tmp_inode->i_size;
 135
 136         if(new_buf_type) {
 137                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
 138
 139                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 140                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 141                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 142                 tmp_inode->i_atime =
 143                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 144                 tmp_inode->i_mtime =
 145                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 146                 tmp_inode->i_ctime =
 147                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 148         } else { /* legacy, OS2 and DOS style */
 149 /*              struct timespec ts;*/
 150                 FIND_FILE_STANDARD_INFO * pfindData =
 151                         (FIND_FILE_STANDARD_INFO *)buf;
 152
 153                 tmp_inode->i_mtime = cnvrtDosUnixTm(
 154                                 le16_to_cpu(pfindData->LastWriteDate),
 155                                 le16_to_cpu(pfindData->LastWriteTime));
 156                 tmp_inode->i_atime = cnvrtDosUnixTm(
 157                                 le16_to_cpu(pfindData->LastAccessDate),
 158                                 le16_to_cpu(pfindData->LastAccessTime));
 159                 tmp_inode->i_ctime = cnvrtDosUnixTm(
 160                                 le16_to_cpu(pfindData->LastWriteDate),
 161                                 le16_to_cpu(pfindData->LastWriteTime));
 162                 AdjustForTZ(cifs_sb->tcon, tmp_inode);
 163                 attr = le16_to_cpu(pfindData->Attributes);
 164                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
 165                 end_of_file = le32_to_cpu(pfindData->DataSize);
 166         }
 167
 168         /* Linux can not store file creation time unfortunately so ignore it */
 169
 170         cifsInfo->cifsAttrs = attr;
 171         cifsInfo->time = jiffies;
 172
 173         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 174         /* 2767 perms - indicate mandatory locking */
 175                 /* BB fill in uid and gid here? with help from winbind?
 176                    or retrieve from NTFS stream extended attribute */
 177         if (atomic_read(&cifsInfo->inUse) == 0) {
 178                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 179                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 180                 /* set default mode. will override for dirs below */
 181                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 182         } else {
 183                 /* mask off the type bits since it gets set
 184                 below and we do not want to get two type
 185                 bits set */
 186                 tmp_inode->i_mode &= ~S_IFMT;
 187         }
 188
 189         if (attr & ATTR_DIRECTORY) {
 190                 *pobject_type = DT_DIR;
 191                 /* override default perms since we do not lock dirs */
 192                 if(atomic_read(&cifsInfo->inUse) == 0) {
 193                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 194                 }
 195                 tmp_inode->i_mode |= S_IFDIR;
 196         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 197                    (attr & ATTR_SYSTEM)) {
 198                 if (end_of_file == 0)  {
 199                         *pobject_type = DT_FIFO;
 200                         tmp_inode->i_mode |= S_IFIFO;
 201                 } else {
 202                         /* rather than get the type here, we mark the
 203                         inode as needing revalidate and get the real type
 204                         (blk vs chr vs. symlink) later ie in lookup */
 205                         *pobject_type = DT_REG;
 206                         tmp_inode->i_mode |= S_IFREG;
 207                         cifsInfo->time = 0;
 208                 }
 209 /* we no longer mark these because we could not follow them */
 210 /*        } else if (attr & ATTR_REPARSE) {
 211                 *pobject_type = DT_LNK;
 212                 tmp_inode->i_mode |= S_IFLNK; */
 213         } else {
 214                 *pobject_type = DT_REG;
 215                 tmp_inode->i_mode |= S_IFREG;
 216                 if (attr & ATTR_READONLY)
 217                         tmp_inode->i_mode &= ~(S_IWUGO);
 218         } /* could add code here - to validate if device or weird share type? */
 219
 220         /* can not fill in nlink here as in qpathinfo version and Unx search */
 221         if (atomic_read(&cifsInfo->inUse) == 0) {
 222                 atomic_set(&cifsInfo->inUse, 1);
 223         }
 224
 225         if (is_size_safe_to_change(cifsInfo)) {
 226                 /* can not safely change the file size here if the
 227                 client is writing to it due to potential races */
 228                 i_size_write(tmp_inode, end_of_file);
 229
 230         /* 512 bytes (2**9) is the fake blocksize that must be used */
 231         /* for this calculation, even though the reported blocksize is larger */
 232                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 233         }
 234
 235         if (allocation_size < end_of_file)
 236                 cFYI(1, ("May be sparse file, allocation less than file size"));
 237         cFYI(1, ("File Size %ld and blocks %llu",
 238                 (unsigned long)tmp_inode->i_size,
 239                 (unsigned long long)tmp_inode->i_blocks));
 240         if (S_ISREG(tmp_inode->i_mode)) {
 241                 cFYI(1, ("File inode"));
 242                 tmp_inode->i_op = &cifs_file_inode_ops;
 243                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 244                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 245                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 246                         else
 247                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 248
 249                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 250                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 251                 else
 252                         tmp_inode->i_fop = &cifs_file_ops;
 253
 254                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 255                    (cifs_sb->tcon->ses->server->maxBuf <
 256                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 257                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 258                 else
 259                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 260
 261                 if(isNewInode)
 262                         return; /* No sense invalidating pages for new inode
 263                                    since have not started caching readahead file
 264                                    data yet */
 265
 266                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 267                         (local_size == tmp_inode->i_size)) {
 268                         cFYI(1, ("inode exists but unchanged"));
 269                 } else {
 270                         /* file may have changed on server */
 271                         cFYI(1, ("invalidate inode, readdir detected change"));
 272                         invalidate_remote_inode(tmp_inode);
 273                 }
 274         } else if (S_ISDIR(tmp_inode->i_mode)) {
 275                 cFYI(1, ("Directory inode"));
 276                 tmp_inode->i_op = &cifs_dir_inode_ops;
 277                 tmp_inode->i_fop = &cifs_dir_ops;
 278         } else if (S_ISLNK(tmp_inode->i_mode)) {
 279                 cFYI(1, ("Symbolic Link inode"));
 280                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 281         } else {
 282                 cFYI(1, ("Init special inode"));
 283                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 284                                    tmp_inode->i_rdev);
 285         }
 286 }
 287
 288 static void unix_fill_in_inode(struct inode *tmp_inode,
 289         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 290 {
 291         loff_t local_size;
 292         struct timespec local_mtime;
 293
 294         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 295         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 296
 297         __u32 type = le32_to_cpu(pfindData->Type);
 298         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 299         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 300         cifsInfo->time = jiffies;
 301         atomic_inc(&cifsInfo->inUse);
 302
 303         /* save mtime and size */
 304         local_mtime = tmp_inode->i_mtime;
 305         local_size  = tmp_inode->i_size;
 306
 307         tmp_inode->i_atime =
 308             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 309         tmp_inode->i_mtime =
 310             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 311         tmp_inode->i_ctime =
 312             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 313
 314         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 315         /* since we set the inode type below we need to mask off type
 316            to avoid strange results if bits above were corrupt */
 317         tmp_inode->i_mode &= ~S_IFMT;
 318         if (type == UNIX_FILE) {
 319                 *pobject_type = DT_REG;
 320                 tmp_inode->i_mode |= S_IFREG;
 321         } else if (type == UNIX_SYMLINK) {
 322                 *pobject_type = DT_LNK;
 323                 tmp_inode->i_mode |= S_IFLNK;
 324         } else if (type == UNIX_DIR) {
 325                 *pobject_type = DT_DIR;
 326                 tmp_inode->i_mode |= S_IFDIR;
 327         } else if (type == UNIX_CHARDEV) {
 328                 *pobject_type = DT_CHR;
 329                 tmp_inode->i_mode |= S_IFCHR;
 330                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 331                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 332         } else if (type == UNIX_BLOCKDEV) {
 333                 *pobject_type = DT_BLK;
 334                 tmp_inode->i_mode |= S_IFBLK;
 335                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 336                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 337         } else if (type == UNIX_FIFO) {
 338                 *pobject_type = DT_FIFO;
 339                 tmp_inode->i_mode |= S_IFIFO;
 340         } else if (type == UNIX_SOCKET) {
 341                 *pobject_type = DT_SOCK;
 342                 tmp_inode->i_mode |= S_IFSOCK;
 343         } else {
 344                 /* safest to just call it a file */
 345                 *pobject_type = DT_REG;
 346                 tmp_inode->i_mode |= S_IFREG;
 347                 cFYI(1,("unknown inode type %d",type));
 348         }
 349
 350         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 351         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 352         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 353
 354         if (is_size_safe_to_change(cifsInfo)) {
 355                 /* can not safely change the file size here if the
 356                 client is writing to it due to potential races */
 357                 i_size_write(tmp_inode,end_of_file);
 358
 359         /* 512 bytes (2**9) is the fake blocksize that must be used */
 360         /* for this calculation, not the real blocksize */
 361                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 362         }
 363
 364         if (S_ISREG(tmp_inode->i_mode)) {
 365                 cFYI(1, ("File inode"));
 366                 tmp_inode->i_op = &cifs_file_inode_ops;
 367
 368                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 369                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 370                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 371                         else
 372                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 373
 374                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 375                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 376                 else
 377                         tmp_inode->i_fop = &cifs_file_ops;
 378
 379                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 380                    (cifs_sb->tcon->ses->server->maxBuf <
 381                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 382                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 383                 else
 384                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 385
 386                 if(isNewInode)
 387                         return; /* No sense invalidating pages for new inode since we
 388                                            have not started caching readahead file data yet */
 389
 390                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 391                         (local_size == tmp_inode->i_size)) {
 392                         cFYI(1, ("inode exists but unchanged"));
 393                 } else {
 394                         /* file may have changed on server */
 395                         cFYI(1, ("invalidate inode, readdir detected change"));
 396                         invalidate_remote_inode(tmp_inode);
 397                 }
 398         } else if (S_ISDIR(tmp_inode->i_mode)) {
 399                 cFYI(1, ("Directory inode"));
 400                 tmp_inode->i_op = &cifs_dir_inode_ops;
 401                 tmp_inode->i_fop = &cifs_dir_ops;
 402         } else if (S_ISLNK(tmp_inode->i_mode)) {
 403                 cFYI(1, ("Symbolic Link inode"));
 404                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 405 /* tmp_inode->i_fop = *//* do not need to set to anything */
 406         } else {
 407                 cFYI(1, ("Special inode"));
 408                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 409                                    tmp_inode->i_rdev);
 410         }
 411 }
 412
 413 static int initiate_cifs_search(const int xid, struct file *file)
 414 {
 415         int rc = 0;
 416         char * full_path;
 417         struct cifsFileInfo * cifsFile;
 418         struct cifs_sb_info *cifs_sb;
 419         struct cifsTconInfo *pTcon;
 420
 421         if(file->private_data == NULL) {
 422                 file->private_data =
 423                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 424         }
 425
 426         if(file->private_data == NULL) {
 427                 return -ENOMEM;
 428         } else {
 429                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 430         }
 431         cifsFile = file->private_data;
 432         cifsFile->invalidHandle = TRUE;
 433         cifsFile->srch_inf.endOfSearch = FALSE;
 434
 435         if(file->f_path.dentry == NULL)
 436                 return -ENOENT;
 437
 438         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 439         if(cifs_sb == NULL)
 440                 return -EINVAL;
 441
 442         pTcon = cifs_sb->tcon;
 443         if(pTcon == NULL)
 444                 return -EINVAL;
 445
 446         full_path = build_path_from_dentry(file->f_path.dentry);
 447
 448         if(full_path == NULL) {
 449                 return -ENOMEM;
 450         }
 451
 452         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 453
 454 ffirst_retry:
 455         /* test for Unix extensions */
 456         if (pTcon->ses->capabilities & CAP_UNIX) {
 457                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 458         } else if ((pTcon->ses->capabilities &
 459                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 460                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 461         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 462                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 463         } else /* not srvinos - BB fixme add check for backlevel? */ {
 464                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 465         }
 466
 467         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 468                 &cifsFile->netfid, &cifsFile->srch_inf,
 469                 cifs_sb->mnt_cifs_flags &
 470                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 471         if(rc == 0)
 472                 cifsFile->invalidHandle = FALSE;
 473         if((rc == -EOPNOTSUPP) &&
 474                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 475                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 476                 goto ffirst_retry;
 477         }
 478         kfree(full_path);
 479         return rc;
 480 }
 481
 482 /* return length of unicode string in bytes */
 483 static int cifs_unicode_bytelen(char *str)
 484 {
 485         int len;
 486         __le16 * ustr = (__le16 *)str;
 487
 488         for(len=0;len <= PATH_MAX;len++) {
 489                 if(ustr[len] == 0)
 490                         return len << 1;
 491         }
 492         cFYI(1,("Unicode string longer than PATH_MAX found"));
 493         return len << 1;
 494 }
 495
 496 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 497 {
 498         char * new_entry;
 499         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 500
 501         if(level == SMB_FIND_FILE_INFO_STANDARD) {
 502                 FIND_FILE_STANDARD_INFO * pfData;
 503                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 504
 505                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 506                                 pfData->FileNameLength;
 507         } else
 508                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 509         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 510         /* validate that new_entry is not past end of SMB */
 511         if(new_entry >= end_of_smb) {
 512                 cERROR(1,
 513                       ("search entry %p began after end of SMB %p old entry %p",
 514                         new_entry, end_of_smb, old_entry));
 515                 return NULL;
 516         } else if(((level == SMB_FIND_FILE_INFO_STANDARD) &&
 517                    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
 518                   ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 519                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 520                 cERROR(1,("search entry %p extends after end of SMB %p",
 521                         new_entry, end_of_smb));
 522                 return NULL;
 523         } else
 524                 return new_entry;
 525
 526 }
 527
 528 #define UNICODE_DOT cpu_to_le16(0x2e)
 529
 530 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 531 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 532 {
 533         int rc = 0;
 534         char * filename = NULL;
 535         int len = 0;
 536
 537         if(cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 538                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 539                 filename = &pFindData->FileName[0];
 540                 if(cfile->srch_inf.unicode) {
 541                         len = cifs_unicode_bytelen(filename);
 542                 } else {
 543                         /* BB should we make this strnlen of PATH_MAX? */
 544                         len = strnlen(filename, 5);
 545                 }
 546         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 547                 FILE_DIRECTORY_INFO * pFindData =
 548                         (FILE_DIRECTORY_INFO *)current_entry;
 549                 filename = &pFindData->FileName[0];
 550                 len = le32_to_cpu(pFindData->FileNameLength);
 551         } else if(cfile->srch_inf.info_level ==
 552                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 553                 FILE_FULL_DIRECTORY_INFO * pFindData =
 554                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 555                 filename = &pFindData->FileName[0];
 556                 len = le32_to_cpu(pFindData->FileNameLength);
 557         } else if(cfile->srch_inf.info_level ==
 558                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 559                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 560                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 561                 filename = &pFindData->FileName[0];
 562                 len = le32_to_cpu(pFindData->FileNameLength);
 563         } else if(cfile->srch_inf.info_level ==
 564                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 565                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 566                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 567                 filename = &pFindData->FileName[0];
 568                 len = le32_to_cpu(pFindData->FileNameLength);
 569         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 570                 FIND_FILE_STANDARD_INFO * pFindData =
 571                         (FIND_FILE_STANDARD_INFO *)current_entry;
 572                 filename = &pFindData->FileName[0];
 573                 len = pFindData->FileNameLength;
 574         } else {
 575                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 576         }
 577
 578         if(filename) {
 579                 if(cfile->srch_inf.unicode) {
 580                         __le16 *ufilename = (__le16 *)filename;
 581                         if(len == 2) {
 582                                 /* check for . */
 583                                 if(ufilename[0] == UNICODE_DOT)
 584                                         rc = 1;
 585                         } else if(len == 4) {
 586                                 /* check for .. */
 587                                 if((ufilename[0] == UNICODE_DOT)
 588                                    &&(ufilename[1] == UNICODE_DOT))
 589                                         rc = 2;
 590                         }
 591                 } else /* ASCII */ {
 592                         if(len == 1) {
 593                                 if(filename[0] == '.')
 594                                         rc = 1;
 595                         } else if(len == 2) {
 596                                 if((filename[0] == '.') && (filename[1] == '.'))
 597                                         rc = 2;
 598                         }
 599                 }
 600         }
 601
 602         return rc;
 603 }
 604
 605 /* Check if directory that we are searching has changed so we can decide
 606    whether we can use the cached search results from the previous search */
 607 static int is_dir_changed(struct file * file)
 608 {
 609         struct inode * inode;
 610         struct cifsInodeInfo *cifsInfo;
 611
 612         if(file->f_path.dentry == NULL)
 613                 return 0;
 614
 615         inode = file->f_path.dentry->d_inode;
 616
 617         if(inode == NULL)
 618                 return 0;
 619
 620         cifsInfo = CIFS_I(inode);
 621
 622         if(cifsInfo->time == 0)
 623                 return 1; /* directory was changed, perhaps due to unlink */
 624         else
 625                 return 0;
 626
 627 }
 628
 629 /* find the corresponding entry in the search */
 630 /* Note that the SMB server returns search entries for . and .. which
 631    complicates logic here if we choose to parse for them and we do not
 632    assume that they are located in the findfirst return buffer.*/
 633 /* We start counting in the buffer with entry 2 and increment for every
 634    entry (do not increment for . or .. entry) */
 635 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 636         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 637 {
 638         int rc = 0;
 639         int pos_in_buf = 0;
 640         loff_t first_entry_in_buffer;
 641         loff_t index_to_find = file->f_pos;
 642         struct cifsFileInfo * cifsFile = file->private_data;
 643         /* check if index in the buffer */
 644
 645         if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 646            (num_to_ret == NULL))
 647                 return -ENOENT;
 648
 649         *ppCurrentEntry = NULL;
 650         first_entry_in_buffer =
 651                 cifsFile->srch_inf.index_of_last_entry -
 652                         cifsFile->srch_inf.entries_in_buffer;
 653
 654         /* if first entry in buf is zero then is first buffer
 655         in search response data which means it is likely . and ..
 656         will be in this buffer, although some servers do not return
 657         . and .. for the root of a drive and for those we need
 658         to start two entries earlier */
 659
 660 #ifdef CONFIG_CIFS_DEBUG2
 661         dump_cifs_file_struct(file, "In fce ");
 662 #endif
 663         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 664              is_dir_changed(file)) ||
 665            (index_to_find < first_entry_in_buffer)) {
 666                 /* close and restart search */
 667                 cFYI(1,("search backing up - close and restart search"));
 668                 cifsFile->invalidHandle = TRUE;
 669                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 670                 kfree(cifsFile->search_resume_name);
 671                 cifsFile->search_resume_name = NULL;
 672                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 673                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 674                         if(cifsFile->srch_inf.smallBuf)
 675                                 cifs_small_buf_release(cifsFile->srch_inf.
 676                                                 ntwrk_buf_start);
 677                         else
 678                                 cifs_buf_release(cifsFile->srch_inf.
 679                                                 ntwrk_buf_start);
 680                 }
 681                 rc = initiate_cifs_search(xid,file);
 682                 if(rc) {
 683                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 684                         return rc;
 685                 }
 686         }
 687
 688         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 689               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 690                 cFYI(1,("calling findnext2"));
 691                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 692                                   &cifsFile->srch_inf);
 693                 if(rc)
 694                         return -ENOENT;
 695         }
 696         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 697                 /* we found the buffer that contains the entry */
 698                 /* scan and find it */
 699                 int i;
 700                 char * current_entry;
 701                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 702                         smbCalcSize((struct smb_hdr *)
 703                                 cifsFile->srch_inf.ntwrk_buf_start);
 704
 705                 current_entry = cifsFile->srch_inf.srch_entries_start;
 706                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 707                                         - cifsFile->srch_inf.entries_in_buffer;
 708                 pos_in_buf = index_to_find - first_entry_in_buffer;
 709                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 710
 711                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 712                         /* go entry by entry figuring out which is first */
 713                         current_entry = nxt_dir_entry(current_entry,end_of_smb,
 714                                                 cifsFile->srch_inf.info_level);
 715                 }
 716                 if((current_entry == NULL) && (i < pos_in_buf)) {
 717                         /* BB fixme - check if we should flag this error */
 718                         cERROR(1,("reached end of buf searching for pos in buf"
 719                           " %d index to find %lld rc %d",
 720                           pos_in_buf,index_to_find,rc));
 721                 }
 722                 rc = 0;
 723                 *ppCurrentEntry = current_entry;
 724         } else {
 725                 cFYI(1,("index not in buffer - could not findnext into it"));
 726                 return 0;
 727         }
 728
 729         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 730                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 731                 *num_to_ret = 0;
 732         } else
 733                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 734
 735         return rc;
 736 }
 737
 738 /* inode num, inode type and filename returned */
 739 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 740         char *current_entry, __u16 level, unsigned int unicode,
 741         struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
 742 {
 743         int rc = 0;
 744         unsigned int len = 0;
 745         char * filename;
 746         struct nls_table * nlt = cifs_sb->local_nls;
 747
 748         *pinum = 0;
 749
 750         if(level == SMB_FIND_FILE_UNIX) {
 751                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 752
 753                 filename = &pFindData->FileName[0];
 754                 if(unicode) {
 755                         len = cifs_unicode_bytelen(filename);
 756                 } else {
 757                         /* BB should we make this strnlen of PATH_MAX? */
 758                         len = strnlen(filename, PATH_MAX);
 759                 }
 760
 761                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 762                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 763                         *pinum = pFindData->UniqueId;
 764         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 765                 FILE_DIRECTORY_INFO * pFindData =
 766                         (FILE_DIRECTORY_INFO *)current_entry;
 767                 filename = &pFindData->FileName[0];
 768                 len = le32_to_cpu(pFindData->FileNameLength);
 769         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 770                 FILE_FULL_DIRECTORY_INFO * pFindData =
 771                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 772                 filename = &pFindData->FileName[0];
 773                 len = le32_to_cpu(pFindData->FileNameLength);
 774         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 775                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 776                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 777                 filename = &pFindData->FileName[0];
 778                 len = le32_to_cpu(pFindData->FileNameLength);
 779                 *pinum = pFindData->UniqueId;
 780         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 781                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 782                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 783                 filename = &pFindData->FileName[0];
 784                 len = le32_to_cpu(pFindData->FileNameLength);
 785         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 786                 FIND_FILE_STANDARD_INFO * pFindData =
 787                         (FIND_FILE_STANDARD_INFO *)current_entry;
 788                 filename = &pFindData->FileName[0];
 789                 /* one byte length, no name conversion */
 790                 len = (unsigned int)pFindData->FileNameLength;
 791         } else {
 792                 cFYI(1,("Unknown findfirst level %d",level));
 793                 return -EINVAL;
 794         }
 795
 796         if(len > max_len) {
 797                 cERROR(1,("bad search response length %d past smb end", len));
 798                 return -EINVAL;
 799         }
 800
 801         if(unicode) {
 802                 /* BB fixme - test with long names */
 803                 /* Note converted filename can be longer than in unicode */
 804                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 805                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 806                                         (__le16 *)filename, len/2, nlt);
 807                 else
 808                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 809                                         (__le16 *)filename,len/2,nlt);
 810         } else {
 811                 pqst->name = filename;
 812                 pqst->len = len;
 813         }
 814         pqst->hash = full_name_hash(pqst->name,pqst->len);
 815 /*      cFYI(1,("filldir on %s",pqst->name));  */
 816         return rc;
 817 }
 818
 819 static int cifs_filldir(char *pfindEntry, struct file *file,
 820         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 821 {
 822         int rc = 0;
 823         struct qstr qstring;
 824         struct cifsFileInfo * pCifsF;
 825         unsigned obj_type;
 826         ino_t  inum;
 827         struct cifs_sb_info * cifs_sb;
 828         struct inode *tmp_inode;
 829         struct dentry *tmp_dentry;
 830
 831         /* get filename and len into qstring */
 832         /* get dentry */
 833         /* decide whether to create and populate ionde */
 834         if((direntry == NULL) || (file == NULL))
 835                 return -EINVAL;
 836
 837         pCifsF = file->private_data;
 838
 839         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 840                 return -ENOENT;
 841
 842         if(file->f_path.dentry == NULL)
 843                 return -ENOENT;
 844
 845         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
 846         /* skip . and .. since we added them first */
 847         if(rc != 0)
 848                 return 0;
 849
 850         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 851
 852         qstring.name = scratch_buf;
 853         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 854                         pCifsF->srch_inf.info_level,
 855                         pCifsF->srch_inf.unicode,cifs_sb,
 856                         max_len,
 857                         &inum /* returned */);
 858
 859         if(rc)
 860                 return rc;
 861
 862         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 863         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 864                 return -ENOMEM;
 865
 866         if(rc) {
 867                 /* inode created, we need to hash it with right inode number */
 868                 if(inum != 0) {
 869                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 870                         tmp_inode->i_ino = inum;
 871                 }
 872                 insert_inode_hash(tmp_inode);
 873         }
 874
 875         /* we pass in rc below, indicating whether it is a new inode,
 876            so we can figure out whether to invalidate the inode cached
 877            data if the file has changed */
 878         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 879                 unix_fill_in_inode(tmp_inode,
 880                                    (FILE_UNIX_INFO *)pfindEntry,
 881                                    &obj_type, rc);
 882         else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 883                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 884                                 pfindEntry, &obj_type, rc);
 885         else
 886                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 887
 888         if(rc) /* new inode - needs to be tied to dentry */ {
 889                 d_instantiate(tmp_dentry, tmp_inode);
 890                 if(rc == 2)
 891                         d_rehash(tmp_dentry);
 892         }
 893
 894
 895         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 896                      tmp_inode->i_ino,obj_type);
 897         if(rc) {
 898                 cFYI(1,("filldir rc = %d",rc));
 899                 /* we can not return filldir errors to the caller
 900                 since they are "normal" when the stat blocksize
 901                 is too small - we return remapped error instead */
 902                 rc = -EOVERFLOW;
 903         }
 904
 905         dput(tmp_dentry);
 906         return rc;
 907 }
 908
 909 static int cifs_save_resume_key(const char *current_entry,
 910         struct cifsFileInfo *cifsFile)
 911 {
 912         int rc = 0;
 913         unsigned int len = 0;
 914         __u16 level;
 915         char * filename;
 916
 917         if((cifsFile == NULL) || (current_entry == NULL))
 918                 return -EINVAL;
 919
 920         level = cifsFile->srch_inf.info_level;
 921
 922         if(level == SMB_FIND_FILE_UNIX) {
 923                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 924
 925                 filename = &pFindData->FileName[0];
 926                 if(cifsFile->srch_inf.unicode) {
 927                         len = cifs_unicode_bytelen(filename);
 928                 } else {
 929                         /* BB should we make this strnlen of PATH_MAX? */
 930                         len = strnlen(filename, PATH_MAX);
 931                 }
 932                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 933         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 934                 FILE_DIRECTORY_INFO * pFindData =
 935                         (FILE_DIRECTORY_INFO *)current_entry;
 936                 filename = &pFindData->FileName[0];
 937                 len = le32_to_cpu(pFindData->FileNameLength);
 938                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 939         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 940                 FILE_FULL_DIRECTORY_INFO * pFindData =
 941                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 942                 filename = &pFindData->FileName[0];
 943                 len = le32_to_cpu(pFindData->FileNameLength);
 944                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 945         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 946                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 947                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 948                 filename = &pFindData->FileName[0];
 949                 len = le32_to_cpu(pFindData->FileNameLength);
 950                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 951         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 952                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 953                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 954                 filename = &pFindData->FileName[0];
 955                 len = le32_to_cpu(pFindData->FileNameLength);
 956                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 957         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 958                 FIND_FILE_STANDARD_INFO * pFindData =
 959                         (FIND_FILE_STANDARD_INFO *)current_entry;
 960                 filename = &pFindData->FileName[0];
 961                 /* one byte length, no name conversion */
 962                 len = (unsigned int)pFindData->FileNameLength;
 963                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 964         } else {
 965                 cFYI(1,("Unknown findfirst level %d",level));
 966                 return -EINVAL;
 967         }
 968         cifsFile->srch_inf.resume_name_len = len;
 969         cifsFile->srch_inf.presume_name = filename;
 970         return rc;
 971 }
 972
 973 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 974 {
 975         int rc = 0;
 976         int xid,i;
 977         struct cifs_sb_info *cifs_sb;
 978         struct cifsTconInfo *pTcon;
 979         struct cifsFileInfo *cifsFile = NULL;
 980         char * current_entry;
 981         int num_to_fill = 0;
 982         char * tmp_buf = NULL;
 983         char * end_of_smb;
 984         int max_len;
 985
 986         xid = GetXid();
 987
 988         if(file->f_path.dentry == NULL) {
 989                 FreeXid(xid);
 990                 return -EIO;
 991         }
 992
 993         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 994         pTcon = cifs_sb->tcon;
 995         if(pTcon == NULL)
 996                 return -EINVAL;
 997
 998         switch ((int) file->f_pos) {
 999         case 0:
1000                 if (filldir(direntry, ".", 1, file->f_pos,
1001                      file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1002                         cERROR(1, ("Filldir for current dir failed"));
1003                         rc = -ENOMEM;
1004                         break;
1005                 }
1006                 file->f_pos++;
1007         case 1:
1008                 if (filldir(direntry, "..", 2, file->f_pos,
1009                      file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1010                         cERROR(1, ("Filldir for parent dir failed"));
1011                         rc = -ENOMEM;
1012                         break;
1013                 }
1014                 file->f_pos++;
1015         default:
1016                 /* 1) If search is active,
1017                         is in current search buffer?
1018                         if it before then restart search
1019                         if after then keep searching till find it */
1020
1021                 if(file->private_data == NULL) {
1022                         rc = initiate_cifs_search(xid,file);
1023                         cFYI(1,("initiate cifs search rc %d",rc));
1024                         if(rc) {
1025                                 FreeXid(xid);
1026                                 return rc;
1027                         }
1028                 }
1029                 if(file->private_data == NULL) {
1030                         rc = -EINVAL;
1031                         FreeXid(xid);
1032                         return rc;
1033                 }
1034                 cifsFile = file->private_data;
1035                 if (cifsFile->srch_inf.endOfSearch) {
1036                         if(cifsFile->srch_inf.emptyDir) {
1037                                 cFYI(1, ("End of search, empty dir"));
1038                                 rc = 0;
1039                                 break;
1040                         }
1041                 } /* else {
1042                         cifsFile->invalidHandle = TRUE;
1043                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1044                 }
1045                 kfree(cifsFile->search_resume_name);
1046                 cifsFile->search_resume_name = NULL; */
1047
1048                 rc = find_cifs_entry(xid,pTcon, file,
1049                                 &current_entry,&num_to_fill);
1050                 if(rc) {
1051                         cFYI(1,("fce error %d",rc));
1052                         goto rddir2_exit;
1053                 } else if (current_entry != NULL) {
1054                         cFYI(1,("entry %lld found",file->f_pos));
1055                 } else {
1056                         cFYI(1,("could not find entry"));
1057                         goto rddir2_exit;
1058                 }
1059                 cFYI(1,("loop through %d times filling dir for net buf %p",
1060                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1061                 max_len = smbCalcSize((struct smb_hdr *)
1062                                 cifsFile->srch_inf.ntwrk_buf_start);
1063                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1064
1065                 /* To be safe - for UCS to UTF-8 with strings loaded
1066                 with the rare long characters alloc more to account for
1067                 such multibyte target UTF-8 characters. cifs_unicode.c,
1068                 which actually does the conversion, has the same limit */
1069                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1070                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1071                         if(current_entry == NULL) {
1072                                 /* evaluate whether this case is an error */
1073                                 cERROR(1,("past end of SMB num to fill %d i %d",
1074                                           num_to_fill, i));
1075                                 break;
1076                         }
1077                         /* if buggy server returns . and .. late do
1078                         we want to check for that here? */
1079                         rc = cifs_filldir(current_entry, file,
1080                                         filldir, direntry, tmp_buf, max_len);
1081                         if(rc == -EOVERFLOW) {
1082                                 rc = 0;
1083                                 break;
1084                         }
1085
1086                         file->f_pos++;
1087                         if(file->f_pos ==
1088                                 cifsFile->srch_inf.index_of_last_entry) {
1089                                 cFYI(1,("last entry in buf at pos %lld %s",
1090                                         file->f_pos,tmp_buf));
1091                                 cifs_save_resume_key(current_entry,cifsFile);
1092                                 break;
1093                         } else
1094                                 current_entry =
1095                                         nxt_dir_entry(current_entry, end_of_smb,
1096                                                 cifsFile->srch_inf.info_level);
1097                 }
1098                 kfree(tmp_buf);
1099                 break;
1100         } /* end switch */
1101
1102 rddir2_exit:
1103         FreeXid(xid);
1104         return rc;
1105 }