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   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004, 2007
   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 "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 #ifdef CONFIG_CIFS_DEBUG2
  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 #endif /* DEBUG2 */
  58
  59 /* Returns one if new inode created (which therefore needs to be hashed) */
  60 /* Might check in the future if inode number changed so we can rehash inode */
  61 static int construct_dentry(struct qstr *qstring, struct file *file,
  62         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  63 {
  64         struct dentry *tmp_dentry;
  65         struct cifs_sb_info *cifs_sb;
  66         struct cifsTconInfo *pTcon;
  67         int rc = 0;
  68
  69         cFYI(1, ("For %s", qstring->name));
  70         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
  71         pTcon = cifs_sb->tcon;
  72
  73         qstring->hash = full_name_hash(qstring->name, qstring->len);
  74         tmp_dentry = d_lookup(file->f_path.dentry, qstring);
  75         if (tmp_dentry) {
  76                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
  77                 *ptmp_inode = tmp_dentry->d_inode;
  78 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
  79                 if (*ptmp_inode == NULL) {
  80                         *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
  81                         if (*ptmp_inode == NULL)
  82                                 return rc;
  83                         rc = 1;
  84                 }
  85                 if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
  86                         (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
  87         } else {
  88                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
  89                 if (tmp_dentry == NULL) {
  90                         cERROR(1,("Failed allocating dentry"));
  91                         *ptmp_inode = NULL;
  92                         return rc;
  93                 }
  94
  95                 *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
  96                 if (pTcon->nocase)
  97                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
  98                 else
  99                         tmp_dentry->d_op = &cifs_dentry_ops;
 100                 if (*ptmp_inode == NULL)
 101                         return rc;
 102                 if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
 103                         (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
 104                 rc = 2;
 105         }
 106
 107         tmp_dentry->d_time = jiffies;
 108         *pnew_dentry = tmp_dentry;
 109         return rc;
 110 }
 111
 112 static void AdjustForTZ(struct cifsTconInfo * tcon, struct inode * inode)
 113 {
 114         if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
 115                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
 116                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
 117                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
 118         }
 119         return;
 120 }
 121
 122
 123 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
 124                 char * buf, int *pobject_type, int isNewInode)
 125 {
 126         loff_t local_size;
 127         struct timespec local_mtime;
 128
 129         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 130         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 131         __u32 attr;
 132         __u64 allocation_size;
 133         __u64 end_of_file;
 134
 135         /* save mtime and size */
 136         local_mtime = tmp_inode->i_mtime;
 137         local_size  = tmp_inode->i_size;
 138
 139         if (new_buf_type) {
 140                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
 141
 142                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 143                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 144                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 145                 tmp_inode->i_atime =
 146                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 147                 tmp_inode->i_mtime =
 148                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 149                 tmp_inode->i_ctime =
 150                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 151         } else { /* legacy, OS2 and DOS style */
 152 /*              struct timespec ts;*/
 153                 FIND_FILE_STANDARD_INFO * pfindData =
 154                         (FIND_FILE_STANDARD_INFO *)buf;
 155
 156                 tmp_inode->i_mtime = cnvrtDosUnixTm(
 157                                 le16_to_cpu(pfindData->LastWriteDate),
 158                                 le16_to_cpu(pfindData->LastWriteTime));
 159                 tmp_inode->i_atime = cnvrtDosUnixTm(
 160                                 le16_to_cpu(pfindData->LastAccessDate),
 161                                 le16_to_cpu(pfindData->LastAccessTime));
 162                 tmp_inode->i_ctime = cnvrtDosUnixTm(
 163                                 le16_to_cpu(pfindData->LastWriteDate),
 164                                 le16_to_cpu(pfindData->LastWriteTime));
 165                 AdjustForTZ(cifs_sb->tcon, tmp_inode);
 166                 attr = le16_to_cpu(pfindData->Attributes);
 167                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
 168                 end_of_file = le32_to_cpu(pfindData->DataSize);
 169         }
 170
 171         /* Linux can not store file creation time unfortunately so ignore it */
 172
 173         cifsInfo->cifsAttrs = attr;
 174         cifsInfo->time = jiffies;
 175
 176         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 177         /* 2767 perms - indicate mandatory locking */
 178                 /* BB fill in uid and gid here? with help from winbind?
 179                    or retrieve from NTFS stream extended attribute */
 180         if (atomic_read(&cifsInfo->inUse) == 0) {
 181                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 182                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 183                 /* set default mode. will override for dirs below */
 184                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 185         } else {
 186                 /* mask off the type bits since it gets set
 187                 below and we do not want to get two type
 188                 bits set */
 189                 tmp_inode->i_mode &= ~S_IFMT;
 190         }
 191
 192         if (attr & ATTR_DIRECTORY) {
 193                 *pobject_type = DT_DIR;
 194                 /* override default perms since we do not lock dirs */
 195                 if (atomic_read(&cifsInfo->inUse) == 0) {
 196                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 197                 }
 198                 tmp_inode->i_mode |= S_IFDIR;
 199         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 200                    (attr & ATTR_SYSTEM)) {
 201                 if (end_of_file == 0)  {
 202                         *pobject_type = DT_FIFO;
 203                         tmp_inode->i_mode |= S_IFIFO;
 204                 } else {
 205                         /* rather than get the type here, we mark the
 206                         inode as needing revalidate and get the real type
 207                         (blk vs chr vs. symlink) later ie in lookup */
 208                         *pobject_type = DT_REG;
 209                         tmp_inode->i_mode |= S_IFREG;
 210                         cifsInfo->time = 0;
 211                 }
 212 /* we no longer mark these because we could not follow them */
 213 /*        } else if (attr & ATTR_REPARSE) {
 214                 *pobject_type = DT_LNK;
 215                 tmp_inode->i_mode |= S_IFLNK; */
 216         } else {
 217                 *pobject_type = DT_REG;
 218                 tmp_inode->i_mode |= S_IFREG;
 219                 if (attr & ATTR_READONLY)
 220                         tmp_inode->i_mode &= ~(S_IWUGO);
 221                 else if ((tmp_inode->i_mode & S_IWUGO) == 0)
 222                         /* the ATTR_READONLY flag may have been changed on   */
 223                         /* server -- set any w bits allowed by mnt_file_mode */
 224                         tmp_inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
 225         } /* could add code here - to validate if device or weird share type? */
 226
 227         /* can not fill in nlink here as in qpathinfo version and Unx search */
 228         if (atomic_read(&cifsInfo->inUse) == 0) {
 229                 atomic_set(&cifsInfo->inUse, 1);
 230         }
 231
 232         spin_lock(&tmp_inode->i_lock);
 233         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 234                 /* can not safely change the file size here if the
 235                 client is writing to it due to potential races */
 236                 i_size_write(tmp_inode, end_of_file);
 237
 238         /* 512 bytes (2**9) is the fake blocksize that must be used */
 239         /* for this calculation, even though the reported blocksize is larger */
 240                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 241         }
 242         spin_unlock(&tmp_inode->i_lock);
 243
 244         if (allocation_size < end_of_file)
 245                 cFYI(1, ("May be sparse file, allocation less than file size"));
 246         cFYI(1, ("File Size %ld and blocks %llu",
 247                 (unsigned long)tmp_inode->i_size,
 248                 (unsigned long long)tmp_inode->i_blocks));
 249         if (S_ISREG(tmp_inode->i_mode)) {
 250                 cFYI(1, ("File inode"));
 251                 tmp_inode->i_op = &cifs_file_inode_ops;
 252                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 253                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 254                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 255                         else
 256                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 257
 258                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 259                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 260                 else
 261                         tmp_inode->i_fop = &cifs_file_ops;
 262
 263                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 264                    (cifs_sb->tcon->ses->server->maxBuf <
 265                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 266                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 267                 else
 268                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 269
 270                 if (isNewInode)
 271                         return; /* No sense invalidating pages for new inode
 272                                    since have not started caching readahead file
 273                                    data yet */
 274
 275                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 276                         (local_size == tmp_inode->i_size)) {
 277                         cFYI(1, ("inode exists but unchanged"));
 278                 } else {
 279                         /* file may have changed on server */
 280                         cFYI(1, ("invalidate inode, readdir detected change"));
 281                         invalidate_remote_inode(tmp_inode);
 282                 }
 283         } else if (S_ISDIR(tmp_inode->i_mode)) {
 284                 cFYI(1, ("Directory inode"));
 285                 tmp_inode->i_op = &cifs_dir_inode_ops;
 286                 tmp_inode->i_fop = &cifs_dir_ops;
 287         } else if (S_ISLNK(tmp_inode->i_mode)) {
 288                 cFYI(1, ("Symbolic Link inode"));
 289                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 290         } else {
 291                 cFYI(1, ("Init special inode"));
 292                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 293                                    tmp_inode->i_rdev);
 294         }
 295 }
 296
 297 static void unix_fill_in_inode(struct inode *tmp_inode,
 298         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 299 {
 300         loff_t local_size;
 301         struct timespec local_mtime;
 302
 303         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 304         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 305
 306         __u32 type = le32_to_cpu(pfindData->Type);
 307         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 308         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 309         cifsInfo->time = jiffies;
 310         atomic_inc(&cifsInfo->inUse);
 311
 312         /* save mtime and size */
 313         local_mtime = tmp_inode->i_mtime;
 314         local_size  = tmp_inode->i_size;
 315
 316         tmp_inode->i_atime =
 317             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 318         tmp_inode->i_mtime =
 319             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 320         tmp_inode->i_ctime =
 321             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 322
 323         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 324         /* since we set the inode type below we need to mask off type
 325            to avoid strange results if bits above were corrupt */
 326         tmp_inode->i_mode &= ~S_IFMT;
 327         if (type == UNIX_FILE) {
 328                 *pobject_type = DT_REG;
 329                 tmp_inode->i_mode |= S_IFREG;
 330         } else if (type == UNIX_SYMLINK) {
 331                 *pobject_type = DT_LNK;
 332                 tmp_inode->i_mode |= S_IFLNK;
 333         } else if (type == UNIX_DIR) {
 334                 *pobject_type = DT_DIR;
 335                 tmp_inode->i_mode |= S_IFDIR;
 336         } else if (type == UNIX_CHARDEV) {
 337                 *pobject_type = DT_CHR;
 338                 tmp_inode->i_mode |= S_IFCHR;
 339                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 340                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 341         } else if (type == UNIX_BLOCKDEV) {
 342                 *pobject_type = DT_BLK;
 343                 tmp_inode->i_mode |= S_IFBLK;
 344                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 345                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 346         } else if (type == UNIX_FIFO) {
 347                 *pobject_type = DT_FIFO;
 348                 tmp_inode->i_mode |= S_IFIFO;
 349         } else if (type == UNIX_SOCKET) {
 350                 *pobject_type = DT_SOCK;
 351                 tmp_inode->i_mode |= S_IFSOCK;
 352         } else {
 353                 /* safest to just call it a file */
 354                 *pobject_type = DT_REG;
 355                 tmp_inode->i_mode |= S_IFREG;
 356                 cFYI(1,("unknown inode type %d",type));
 357         }
 358
 359         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 360                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 361         else
 362                 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 363         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 364                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 365         else
 366                 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 367         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 368
 369         spin_lock(&tmp_inode->i_lock);
 370         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 371                 /* can not safely change the file size here if the
 372                 client is writing to it due to potential races */
 373                 i_size_write(tmp_inode, end_of_file);
 374
 375         /* 512 bytes (2**9) is the fake blocksize that must be used */
 376         /* for this calculation, not the real blocksize */
 377                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 378         }
 379         spin_unlock(&tmp_inode->i_lock);
 380
 381         if (S_ISREG(tmp_inode->i_mode)) {
 382                 cFYI(1, ("File inode"));
 383                 tmp_inode->i_op = &cifs_file_inode_ops;
 384
 385                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 386                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 387                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 388                         else
 389                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 390                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 391                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 392                 else
 393                         tmp_inode->i_fop = &cifs_file_ops;
 394
 395                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 396                    (cifs_sb->tcon->ses->server->maxBuf <
 397                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 398                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 399                 else
 400                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 401
 402                 if (isNewInode)
 403                         return; /* No sense invalidating pages for new inode since we
 404                                            have not started caching readahead file data yet */
 405
 406                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 407                         (local_size == tmp_inode->i_size)) {
 408                         cFYI(1, ("inode exists but unchanged"));
 409                 } else {
 410                         /* file may have changed on server */
 411                         cFYI(1, ("invalidate inode, readdir detected change"));
 412                         invalidate_remote_inode(tmp_inode);
 413                 }
 414         } else if (S_ISDIR(tmp_inode->i_mode)) {
 415                 cFYI(1, ("Directory inode"));
 416                 tmp_inode->i_op = &cifs_dir_inode_ops;
 417                 tmp_inode->i_fop = &cifs_dir_ops;
 418         } else if (S_ISLNK(tmp_inode->i_mode)) {
 419                 cFYI(1, ("Symbolic Link inode"));
 420                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 421 /* tmp_inode->i_fop = *//* do not need to set to anything */
 422         } else {
 423                 cFYI(1, ("Special inode"));
 424                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 425                                    tmp_inode->i_rdev);
 426         }
 427 }
 428
 429 static int initiate_cifs_search(const int xid, struct file *file)
 430 {
 431         int rc = 0;
 432         char * full_path;
 433         struct cifsFileInfo * cifsFile;
 434         struct cifs_sb_info *cifs_sb;
 435         struct cifsTconInfo *pTcon;
 436
 437         if (file->private_data == NULL) {
 438                 file->private_data =
 439                         kzalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 440         }
 441
 442         if (file->private_data == NULL)
 443                 return -ENOMEM;
 444         cifsFile = file->private_data;
 445         cifsFile->invalidHandle = TRUE;
 446         cifsFile->srch_inf.endOfSearch = FALSE;
 447
 448         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 449         if (cifs_sb == NULL)
 450                 return -EINVAL;
 451
 452         pTcon = cifs_sb->tcon;
 453         if (pTcon == NULL)
 454                 return -EINVAL;
 455
 456         full_path = build_path_from_dentry(file->f_path.dentry);
 457
 458         if (full_path == NULL) {
 459                 return -ENOMEM;
 460         }
 461
 462         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 463
 464 ffirst_retry:
 465         /* test for Unix extensions */
 466         if (pTcon->ses->capabilities & CAP_UNIX) {
 467                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 468         } else if ((pTcon->ses->capabilities &
 469                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 470                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 471         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 472                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 473         } else /* not srvinos - BB fixme add check for backlevel? */ {
 474                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 475         }
 476
 477         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 478                 &cifsFile->netfid, &cifsFile->srch_inf,
 479                 cifs_sb->mnt_cifs_flags &
 480                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 481         if (rc == 0)
 482                 cifsFile->invalidHandle = FALSE;
 483         if ((rc == -EOPNOTSUPP) &&
 484                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 485                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 486                 goto ffirst_retry;
 487         }
 488         kfree(full_path);
 489         return rc;
 490 }
 491
 492 /* return length of unicode string in bytes */
 493 static int cifs_unicode_bytelen(char *str)
 494 {
 495         int len;
 496         __le16 * ustr = (__le16 *)str;
 497
 498         for(len=0;len <= PATH_MAX;len++) {
 499                 if (ustr[len] == 0)
 500                         return len << 1;
 501         }
 502         cFYI(1,("Unicode string longer than PATH_MAX found"));
 503         return len << 1;
 504 }
 505
 506 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 507 {
 508         char * new_entry;
 509         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 510
 511         if (level == SMB_FIND_FILE_INFO_STANDARD) {
 512                 FIND_FILE_STANDARD_INFO * pfData;
 513                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 514
 515                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 516                                 pfData->FileNameLength;
 517         } else
 518                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 519         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 520         /* validate that new_entry is not past end of SMB */
 521         if (new_entry >= end_of_smb) {
 522                 cERROR(1,
 523                       ("search entry %p began after end of SMB %p old entry %p",
 524                         new_entry, end_of_smb, old_entry));
 525                 return NULL;
 526         } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
 527                    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
 528                   ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 529                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 530                 cERROR(1,("search entry %p extends after end of SMB %p",
 531                         new_entry, end_of_smb));
 532                 return NULL;
 533         } else
 534                 return new_entry;
 535
 536 }
 537
 538 #define UNICODE_DOT cpu_to_le16(0x2e)
 539
 540 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 541 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 542 {
 543         int rc = 0;
 544         char * filename = NULL;
 545         int len = 0;
 546
 547         if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 548                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 549                 filename = &pFindData->FileName[0];
 550                 if (cfile->srch_inf.unicode) {
 551                         len = cifs_unicode_bytelen(filename);
 552                 } else {
 553                         /* BB should we make this strnlen of PATH_MAX? */
 554                         len = strnlen(filename, 5);
 555                 }
 556         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 557                 FILE_DIRECTORY_INFO * pFindData =
 558                         (FILE_DIRECTORY_INFO *)current_entry;
 559                 filename = &pFindData->FileName[0];
 560                 len = le32_to_cpu(pFindData->FileNameLength);
 561         } else if (cfile->srch_inf.info_level ==
 562                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 563                 FILE_FULL_DIRECTORY_INFO * pFindData =
 564                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 565                 filename = &pFindData->FileName[0];
 566                 len = le32_to_cpu(pFindData->FileNameLength);
 567         } else if (cfile->srch_inf.info_level ==
 568                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 569                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 570                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 571                 filename = &pFindData->FileName[0];
 572                 len = le32_to_cpu(pFindData->FileNameLength);
 573         } else if (cfile->srch_inf.info_level ==
 574                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 575                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 576                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 577                 filename = &pFindData->FileName[0];
 578                 len = le32_to_cpu(pFindData->FileNameLength);
 579         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 580                 FIND_FILE_STANDARD_INFO * pFindData =
 581                         (FIND_FILE_STANDARD_INFO *)current_entry;
 582                 filename = &pFindData->FileName[0];
 583                 len = pFindData->FileNameLength;
 584         } else {
 585                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 586         }
 587
 588         if (filename) {
 589                 if (cfile->srch_inf.unicode) {
 590                         __le16 *ufilename = (__le16 *)filename;
 591                         if (len == 2) {
 592                                 /* check for . */
 593                                 if (ufilename[0] == UNICODE_DOT)
 594                                         rc = 1;
 595                         } else if (len == 4) {
 596                                 /* check for .. */
 597                                 if ((ufilename[0] == UNICODE_DOT)
 598                                    &&(ufilename[1] == UNICODE_DOT))
 599                                         rc = 2;
 600                         }
 601                 } else /* ASCII */ {
 602                         if (len == 1) {
 603                                 if (filename[0] == '.')
 604                                         rc = 1;
 605                         } else if (len == 2) {
 606                                 if((filename[0] == '.') && (filename[1] == '.'))
 607                                         rc = 2;
 608                         }
 609                 }
 610         }
 611
 612         return rc;
 613 }
 614
 615 /* Check if directory that we are searching has changed so we can decide
 616    whether we can use the cached search results from the previous search */
 617 static int is_dir_changed(struct file * file)
 618 {
 619         struct inode *inode = file->f_path.dentry->d_inode;
 620         struct cifsInodeInfo *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         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
 843         /* skip . and .. since we added them first */
 844         if(rc != 0)
 845                 return 0;
 846
 847         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 848
 849         qstring.name = scratch_buf;
 850         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 851                         pCifsF->srch_inf.info_level,
 852                         pCifsF->srch_inf.unicode,cifs_sb,
 853                         max_len,
 854                         &inum /* returned */);
 855
 856         if(rc)
 857                 return rc;
 858
 859         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 860         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 861                 return -ENOMEM;
 862
 863         if(rc) {
 864                 /* inode created, we need to hash it with right inode number */
 865                 if(inum != 0) {
 866                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 867                         tmp_inode->i_ino = inum;
 868                 }
 869                 insert_inode_hash(tmp_inode);
 870         }
 871
 872         /* we pass in rc below, indicating whether it is a new inode,
 873            so we can figure out whether to invalidate the inode cached
 874            data if the file has changed */
 875         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 876                 unix_fill_in_inode(tmp_inode,
 877                                    (FILE_UNIX_INFO *)pfindEntry,
 878                                    &obj_type, rc);
 879         else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 880                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 881                                 pfindEntry, &obj_type, rc);
 882         else
 883                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 884
 885         if(rc) /* new inode - needs to be tied to dentry */ {
 886                 d_instantiate(tmp_dentry, tmp_inode);
 887                 if(rc == 2)
 888                         d_rehash(tmp_dentry);
 889         }
 890
 891
 892         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 893                      tmp_inode->i_ino,obj_type);
 894         if(rc) {
 895                 cFYI(1,("filldir rc = %d",rc));
 896                 /* we can not return filldir errors to the caller
 897                 since they are "normal" when the stat blocksize
 898                 is too small - we return remapped error instead */
 899                 rc = -EOVERFLOW;
 900         }
 901
 902         dput(tmp_dentry);
 903         return rc;
 904 }
 905
 906 static int cifs_save_resume_key(const char *current_entry,
 907         struct cifsFileInfo *cifsFile)
 908 {
 909         int rc = 0;
 910         unsigned int len = 0;
 911         __u16 level;
 912         char * filename;
 913
 914         if((cifsFile == NULL) || (current_entry == NULL))
 915                 return -EINVAL;
 916
 917         level = cifsFile->srch_inf.info_level;
 918
 919         if(level == SMB_FIND_FILE_UNIX) {
 920                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 921
 922                 filename = &pFindData->FileName[0];
 923                 if(cifsFile->srch_inf.unicode) {
 924                         len = cifs_unicode_bytelen(filename);
 925                 } else {
 926                         /* BB should we make this strnlen of PATH_MAX? */
 927                         len = strnlen(filename, PATH_MAX);
 928                 }
 929                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 930         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 931                 FILE_DIRECTORY_INFO * pFindData =
 932                         (FILE_DIRECTORY_INFO *)current_entry;
 933                 filename = &pFindData->FileName[0];
 934                 len = le32_to_cpu(pFindData->FileNameLength);
 935                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 936         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 937                 FILE_FULL_DIRECTORY_INFO * pFindData =
 938                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 939                 filename = &pFindData->FileName[0];
 940                 len = le32_to_cpu(pFindData->FileNameLength);
 941                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 942         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 943                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 944                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 945                 filename = &pFindData->FileName[0];
 946                 len = le32_to_cpu(pFindData->FileNameLength);
 947                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 948         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 949                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 950                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 951                 filename = &pFindData->FileName[0];
 952                 len = le32_to_cpu(pFindData->FileNameLength);
 953                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 954         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 955                 FIND_FILE_STANDARD_INFO * pFindData =
 956                         (FIND_FILE_STANDARD_INFO *)current_entry;
 957                 filename = &pFindData->FileName[0];
 958                 /* one byte length, no name conversion */
 959                 len = (unsigned int)pFindData->FileNameLength;
 960                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 961         } else {
 962                 cFYI(1,("Unknown findfirst level %d",level));
 963                 return -EINVAL;
 964         }
 965         cifsFile->srch_inf.resume_name_len = len;
 966         cifsFile->srch_inf.presume_name = filename;
 967         return rc;
 968 }
 969
 970 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 971 {
 972         int rc = 0;
 973         int xid,i;
 974         struct cifs_sb_info *cifs_sb;
 975         struct cifsTconInfo *pTcon;
 976         struct cifsFileInfo *cifsFile = NULL;
 977         char * current_entry;
 978         int num_to_fill = 0;
 979         char * tmp_buf = NULL;
 980         char * end_of_smb;
 981         int max_len;
 982
 983         xid = GetXid();
 984
 985         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 986         pTcon = cifs_sb->tcon;
 987         if(pTcon == NULL)
 988                 return -EINVAL;
 989
 990         switch ((int) file->f_pos) {
 991         case 0:
 992                 if (filldir(direntry, ".", 1, file->f_pos,
 993                      file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
 994                         cERROR(1, ("Filldir for current dir failed"));
 995                         rc = -ENOMEM;
 996                         break;
 997                 }
 998                 file->f_pos++;
 999         case 1:
1000                 if (filldir(direntry, "..", 2, file->f_pos,
1001                      file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1002                         cERROR(1, ("Filldir for parent dir failed"));
1003                         rc = -ENOMEM;
1004                         break;
1005                 }
1006                 file->f_pos++;
1007         default:
1008                 /* 1) If search is active,
1009                         is in current search buffer?
1010                         if it before then restart search
1011                         if after then keep searching till find it */
1012
1013                 if(file->private_data == NULL) {
1014                         rc = initiate_cifs_search(xid,file);
1015                         cFYI(1,("initiate cifs search rc %d",rc));
1016                         if(rc) {
1017                                 FreeXid(xid);
1018                                 return rc;
1019                         }
1020                 }
1021                 if(file->private_data == NULL) {
1022                         rc = -EINVAL;
1023                         FreeXid(xid);
1024                         return rc;
1025                 }
1026                 cifsFile = file->private_data;
1027                 if (cifsFile->srch_inf.endOfSearch) {
1028                         if(cifsFile->srch_inf.emptyDir) {
1029                                 cFYI(1, ("End of search, empty dir"));
1030                                 rc = 0;
1031                                 break;
1032                         }
1033                 } /* else {
1034                         cifsFile->invalidHandle = TRUE;
1035                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1036                 }
1037                 kfree(cifsFile->search_resume_name);
1038                 cifsFile->search_resume_name = NULL; */
1039
1040                 rc = find_cifs_entry(xid,pTcon, file,
1041                                 &current_entry,&num_to_fill);
1042                 if(rc) {
1043                         cFYI(1,("fce error %d",rc));
1044                         goto rddir2_exit;
1045                 } else if (current_entry != NULL) {
1046                         cFYI(1,("entry %lld found",file->f_pos));
1047                 } else {
1048                         cFYI(1,("could not find entry"));
1049                         goto rddir2_exit;
1050                 }
1051                 cFYI(1,("loop through %d times filling dir for net buf %p",
1052                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1053                 max_len = smbCalcSize((struct smb_hdr *)
1054                                 cifsFile->srch_inf.ntwrk_buf_start);
1055                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1056
1057                 /* To be safe - for UCS to UTF-8 with strings loaded
1058                 with the rare long characters alloc more to account for
1059                 such multibyte target UTF-8 characters. cifs_unicode.c,
1060                 which actually does the conversion, has the same limit */
1061                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1062                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1063                         if(current_entry == NULL) {
1064                                 /* evaluate whether this case is an error */
1065                                 cERROR(1,("past end of SMB num to fill %d i %d",
1066                                           num_to_fill, i));
1067                                 break;
1068                         }
1069                         /* if buggy server returns . and .. late do
1070                         we want to check for that here? */
1071                         rc = cifs_filldir(current_entry, file,
1072                                         filldir, direntry, tmp_buf, max_len);
1073                         if(rc == -EOVERFLOW) {
1074                                 rc = 0;
1075                                 break;
1076                         }
1077
1078                         file->f_pos++;
1079                         if(file->f_pos ==
1080                                 cifsFile->srch_inf.index_of_last_entry) {
1081                                 cFYI(1,("last entry in buf at pos %lld %s",
1082                                         file->f_pos,tmp_buf));
1083                                 cifs_save_resume_key(current_entry,cifsFile);
1084                                 break;
1085                         } else
1086                                 current_entry =
1087                                         nxt_dir_entry(current_entry, end_of_smb,
1088                                                 cifsFile->srch_inf.info_level);
1089                 }
1090                 kfree(tmp_buf);
1091                 break;
1092         } /* end switch */
1093
1094 rddir2_exit:
1095         FreeXid(xid);
1096         return rc;
1097 }