fs/cifs/readdir.c

   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",
  77                          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                 if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
  87                         (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
  88         } else {
  89                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
  90                 if (tmp_dentry == NULL) {
  91                         cERROR(1, ("Failed allocating dentry"));
  92                         *ptmp_inode = NULL;
  93                         return rc;
  94                 }
  95
  96                 *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
  97                 if (pTcon->nocase)
  98                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
  99                 else
 100                         tmp_dentry->d_op = &cifs_dentry_ops;
 101                 if (*ptmp_inode == NULL)
 102                         return rc;
 103                 if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
 104                         (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
 105                 rc = 2;
 106         }
 107
 108         tmp_dentry->d_time = jiffies;
 109         *pnew_dentry = tmp_dentry;
 110         return rc;
 111 }
 112
 113 static void AdjustForTZ(struct cifsTconInfo * tcon, struct inode * inode)
 114 {
 115         if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
 116                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
 117                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
 118                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
 119         }
 120         return;
 121 }
 122
 123
 124 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
 125                 char * buf, int *pobject_type, int isNewInode)
 126 {
 127         loff_t local_size;
 128         struct timespec local_mtime;
 129
 130         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 131         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 132         __u32 attr;
 133         __u64 allocation_size;
 134         __u64 end_of_file;
 135
 136         /* save mtime and size */
 137         local_mtime = tmp_inode->i_mtime;
 138         local_size  = tmp_inode->i_size;
 139
 140         if (new_buf_type) {
 141                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
 142
 143                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 144                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 145                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 146                 tmp_inode->i_atime =
 147                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 148                 tmp_inode->i_mtime =
 149                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 150                 tmp_inode->i_ctime =
 151                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 152         } else { /* legacy, OS2 and DOS style */
 153 /*              struct timespec ts;*/
 154                 FIND_FILE_STANDARD_INFO * pfindData =
 155                         (FIND_FILE_STANDARD_INFO *)buf;
 156
 157                 tmp_inode->i_mtime = cnvrtDosUnixTm(
 158                                 le16_to_cpu(pfindData->LastWriteDate),
 159                                 le16_to_cpu(pfindData->LastWriteTime));
 160                 tmp_inode->i_atime = cnvrtDosUnixTm(
 161                                 le16_to_cpu(pfindData->LastAccessDate),
 162                                 le16_to_cpu(pfindData->LastAccessTime));
 163                 tmp_inode->i_ctime = cnvrtDosUnixTm(
 164                                 le16_to_cpu(pfindData->LastWriteDate),
 165                                 le16_to_cpu(pfindData->LastWriteTime));
 166                 AdjustForTZ(cifs_sb->tcon, tmp_inode);
 167                 attr = le16_to_cpu(pfindData->Attributes);
 168                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
 169                 end_of_file = le32_to_cpu(pfindData->DataSize);
 170         }
 171
 172         /* Linux can not store file creation time unfortunately so ignore it */
 173
 174         cifsInfo->cifsAttrs = attr;
 175         cifsInfo->time = jiffies;
 176
 177         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 178         /* 2767 perms - indicate mandatory locking */
 179                 /* BB fill in uid and gid here? with help from winbind?
 180                    or retrieve from NTFS stream extended attribute */
 181         if (atomic_read(&cifsInfo->inUse) == 0) {
 182                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 183                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 184                 /* set default mode. will override for dirs below */
 185                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 186         } else {
 187                 /* mask off the type bits since it gets set
 188                 below and we do not want to get two type
 189                 bits set */
 190                 tmp_inode->i_mode &= ~S_IFMT;
 191         }
 192
 193         if (attr & ATTR_DIRECTORY) {
 194                 *pobject_type = DT_DIR;
 195                 /* override default perms since we do not lock dirs */
 196                 if (atomic_read(&cifsInfo->inUse) == 0) {
 197                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 198                 }
 199                 tmp_inode->i_mode |= S_IFDIR;
 200         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 201                    (attr & ATTR_SYSTEM)) {
 202                 if (end_of_file == 0)  {
 203                         *pobject_type = DT_FIFO;
 204                         tmp_inode->i_mode |= S_IFIFO;
 205                 } else {
 206                         /* rather than get the type here, we mark the
 207                         inode as needing revalidate and get the real type
 208                         (blk vs chr vs. symlink) later ie in lookup */
 209                         *pobject_type = DT_REG;
 210                         tmp_inode->i_mode |= S_IFREG;
 211                         cifsInfo->time = 0;
 212                 }
 213 /* we no longer mark these because we could not follow them */
 214 /*        } else if (attr & ATTR_REPARSE) {
 215                 *pobject_type = DT_LNK;
 216                 tmp_inode->i_mode |= S_IFLNK; */
 217         } else {
 218                 *pobject_type = DT_REG;
 219                 tmp_inode->i_mode |= S_IFREG;
 220                 if (attr & ATTR_READONLY)
 221                         tmp_inode->i_mode &= ~(S_IWUGO);
 222                 else if ((tmp_inode->i_mode & S_IWUGO) == 0)
 223                         /* the ATTR_READONLY flag may have been changed on   */
 224                         /* server -- set any w bits allowed by mnt_file_mode */
 225                         tmp_inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
 226         } /* could add code here - to validate if device or weird share type? */
 227
 228         /* can not fill in nlink here as in qpathinfo version and Unx search */
 229         if (atomic_read(&cifsInfo->inUse) == 0) {
 230                 atomic_set(&cifsInfo->inUse, 1);
 231         }
 232
 233         spin_lock(&tmp_inode->i_lock);
 234         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 235                 /* can not safely change the file size here if the
 236                 client is writing to it due to potential races */
 237                 i_size_write(tmp_inode, end_of_file);
 238
 239         /* 512 bytes (2**9) is the fake blocksize that must be used */
 240         /* for this calculation, even though the reported blocksize is larger */
 241                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 242         }
 243         spin_unlock(&tmp_inode->i_lock);
 244
 245         if (allocation_size < end_of_file)
 246                 cFYI(1, ("May be sparse file, allocation less than file size"));
 247         cFYI(1, ("File Size %ld and blocks %llu",
 248                 (unsigned long)tmp_inode->i_size,
 249                 (unsigned long long)tmp_inode->i_blocks));
 250         if (S_ISREG(tmp_inode->i_mode)) {
 251                 cFYI(1, ("File inode"));
 252                 tmp_inode->i_op = &cifs_file_inode_ops;
 253                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 254                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 255                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 256                         else
 257                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 258
 259                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 260                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 261                 else
 262                         tmp_inode->i_fop = &cifs_file_ops;
 263
 264                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 265                    (cifs_sb->tcon->ses->server->maxBuf <
 266                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 267                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 268                 else
 269                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 270
 271                 if (isNewInode)
 272                         return; /* No sense invalidating pages for new inode
 273                                    since have not started caching readahead file
 274                                    data yet */
 275
 276                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 277                         (local_size == tmp_inode->i_size)) {
 278                         cFYI(1, ("inode exists but unchanged"));
 279                 } else {
 280                         /* file may have changed on server */
 281                         cFYI(1, ("invalidate inode, readdir detected change"));
 282                         invalidate_remote_inode(tmp_inode);
 283                 }
 284         } else if (S_ISDIR(tmp_inode->i_mode)) {
 285                 cFYI(1, ("Directory inode"));
 286                 tmp_inode->i_op = &cifs_dir_inode_ops;
 287                 tmp_inode->i_fop = &cifs_dir_ops;
 288         } else if (S_ISLNK(tmp_inode->i_mode)) {
 289                 cFYI(1, ("Symbolic Link inode"));
 290                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 291         } else {
 292                 cFYI(1, ("Init special inode"));
 293                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 294                                    tmp_inode->i_rdev);
 295         }
 296 }
 297
 298 static void unix_fill_in_inode(struct inode *tmp_inode,
 299         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 300 {
 301         loff_t local_size;
 302         struct timespec local_mtime;
 303
 304         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 305         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 306
 307         __u32 type = le32_to_cpu(pfindData->Type);
 308         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 309         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 310         cifsInfo->time = jiffies;
 311         atomic_inc(&cifsInfo->inUse);
 312
 313         /* save mtime and size */
 314         local_mtime = tmp_inode->i_mtime;
 315         local_size  = tmp_inode->i_size;
 316
 317         tmp_inode->i_atime =
 318             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 319         tmp_inode->i_mtime =
 320             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 321         tmp_inode->i_ctime =
 322             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 323
 324         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 325         /* since we set the inode type below we need to mask off type
 326            to avoid strange results if bits above were corrupt */
 327         tmp_inode->i_mode &= ~S_IFMT;
 328         if (type == UNIX_FILE) {
 329                 *pobject_type = DT_REG;
 330                 tmp_inode->i_mode |= S_IFREG;
 331         } else if (type == UNIX_SYMLINK) {
 332                 *pobject_type = DT_LNK;
 333                 tmp_inode->i_mode |= S_IFLNK;
 334         } else if (type == UNIX_DIR) {
 335                 *pobject_type = DT_DIR;
 336                 tmp_inode->i_mode |= S_IFDIR;
 337         } else if (type == UNIX_CHARDEV) {
 338                 *pobject_type = DT_CHR;
 339                 tmp_inode->i_mode |= S_IFCHR;
 340                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 341                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 342         } else if (type == UNIX_BLOCKDEV) {
 343                 *pobject_type = DT_BLK;
 344                 tmp_inode->i_mode |= S_IFBLK;
 345                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 346                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 347         } else if (type == UNIX_FIFO) {
 348                 *pobject_type = DT_FIFO;
 349                 tmp_inode->i_mode |= S_IFIFO;
 350         } else if (type == UNIX_SOCKET) {
 351                 *pobject_type = DT_SOCK;
 352                 tmp_inode->i_mode |= S_IFSOCK;
 353         } else {
 354                 /* safest to just call it a file */
 355                 *pobject_type = DT_REG;
 356                 tmp_inode->i_mode |= S_IFREG;
 357                 cFYI(1,("unknown inode type %d",type));
 358         }
 359
 360         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 361                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 362         else
 363                 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 364         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 365                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 366         else
 367                 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 368         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 369
 370         spin_lock(&tmp_inode->i_lock);
 371         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 372                 /* can not safely change the file size here if the
 373                 client is writing to it due to potential races */
 374                 i_size_write(tmp_inode, end_of_file);
 375
 376         /* 512 bytes (2**9) is the fake blocksize that must be used */
 377         /* for this calculation, not the real blocksize */
 378                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 379         }
 380         spin_unlock(&tmp_inode->i_lock);
 381
 382         if (S_ISREG(tmp_inode->i_mode)) {
 383                 cFYI(1, ("File inode"));
 384                 tmp_inode->i_op = &cifs_file_inode_ops;
 385
 386                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 387                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 388                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 389                         else
 390                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 391                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 392                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 393                 else
 394                         tmp_inode->i_fop = &cifs_file_ops;
 395
 396                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 397                    (cifs_sb->tcon->ses->server->maxBuf <
 398                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 399                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 400                 else
 401                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 402
 403                 if (isNewInode)
 404                         return; /* No sense invalidating pages for new inode since we
 405                                            have not started caching readahead file data yet */
 406
 407                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 408                         (local_size == tmp_inode->i_size)) {
 409                         cFYI(1, ("inode exists but unchanged"));
 410                 } else {
 411                         /* file may have changed on server */
 412                         cFYI(1, ("invalidate inode, readdir detected change"));
 413                         invalidate_remote_inode(tmp_inode);
 414                 }
 415         } else if (S_ISDIR(tmp_inode->i_mode)) {
 416                 cFYI(1, ("Directory inode"));
 417                 tmp_inode->i_op = &cifs_dir_inode_ops;
 418                 tmp_inode->i_fop = &cifs_dir_ops;
 419         } else if (S_ISLNK(tmp_inode->i_mode)) {
 420                 cFYI(1, ("Symbolic Link inode"));
 421                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 422 /* tmp_inode->i_fop = *//* do not need to set to anything */
 423         } else {
 424                 cFYI(1, ("Special inode"));
 425                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 426                                    tmp_inode->i_rdev);
 427         }
 428 }
 429
 430 static int initiate_cifs_search(const int xid, struct file *file)
 431 {
 432         int rc = 0;
 433         char * full_path;
 434         struct cifsFileInfo * cifsFile;
 435         struct cifs_sb_info *cifs_sb;
 436         struct cifsTconInfo *pTcon;
 437
 438         if (file->private_data == NULL) {
 439                 file->private_data =
 440                         kzalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 441         }
 442
 443         if (file->private_data == NULL)
 444                 return -ENOMEM;
 445         cifsFile = file->private_data;
 446         cifsFile->invalidHandle = TRUE;
 447         cifsFile->srch_inf.endOfSearch = FALSE;
 448
 449         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 450         if (cifs_sb == NULL)
 451                 return -EINVAL;
 452
 453         pTcon = cifs_sb->tcon;
 454         if (pTcon == NULL)
 455                 return -EINVAL;
 456
 457         full_path = build_path_from_dentry(file->f_path.dentry);
 458
 459         if (full_path == NULL) {
 460                 return -ENOMEM;
 461         }
 462
 463         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 464
 465 ffirst_retry:
 466         /* test for Unix extensions */
 467         if (pTcon->ses->capabilities & CAP_UNIX) {
 468                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 469         } else if ((pTcon->ses->capabilities &
 470                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 471                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 472         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 473                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 474         } else /* not srvinos - BB fixme add check for backlevel? */ {
 475                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 476         }
 477
 478         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 479                 &cifsFile->netfid, &cifsFile->srch_inf,
 480                 cifs_sb->mnt_cifs_flags &
 481                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 482         if (rc == 0)
 483                 cifsFile->invalidHandle = FALSE;
 484         if ((rc == -EOPNOTSUPP) &&
 485                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 486                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 487                 goto ffirst_retry;
 488         }
 489         kfree(full_path);
 490         return rc;
 491 }
 492
 493 /* return length of unicode string in bytes */
 494 static int cifs_unicode_bytelen(char *str)
 495 {
 496         int len;
 497         __le16 * ustr = (__le16 *)str;
 498
 499         for(len=0;len <= PATH_MAX;len++) {
 500                 if (ustr[len] == 0)
 501                         return len << 1;
 502         }
 503         cFYI(1,("Unicode string longer than PATH_MAX found"));
 504         return len << 1;
 505 }
 506
 507 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 508 {
 509         char * new_entry;
 510         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 511
 512         if (level == SMB_FIND_FILE_INFO_STANDARD) {
 513                 FIND_FILE_STANDARD_INFO * pfData;
 514                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 515
 516                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 517                                 pfData->FileNameLength;
 518         } else
 519                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 520         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 521         /* validate that new_entry is not past end of SMB */
 522         if (new_entry >= end_of_smb) {
 523                 cERROR(1,
 524                       ("search entry %p began after end of SMB %p old entry %p",
 525                         new_entry, end_of_smb, old_entry));
 526                 return NULL;
 527         } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
 528                    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
 529                   ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 530                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 531                 cERROR(1,("search entry %p extends after end of SMB %p",
 532                         new_entry, end_of_smb));
 533                 return NULL;
 534         } else
 535                 return new_entry;
 536
 537 }
 538
 539 #define UNICODE_DOT cpu_to_le16(0x2e)
 540
 541 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 542 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 543 {
 544         int rc = 0;
 545         char * filename = NULL;
 546         int len = 0;
 547
 548         if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 549                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 550                 filename = &pFindData->FileName[0];
 551                 if (cfile->srch_inf.unicode) {
 552                         len = cifs_unicode_bytelen(filename);
 553                 } else {
 554                         /* BB should we make this strnlen of PATH_MAX? */
 555                         len = strnlen(filename, 5);
 556                 }
 557         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 558                 FILE_DIRECTORY_INFO * pFindData =
 559                         (FILE_DIRECTORY_INFO *)current_entry;
 560                 filename = &pFindData->FileName[0];
 561                 len = le32_to_cpu(pFindData->FileNameLength);
 562         } else if (cfile->srch_inf.info_level ==
 563                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 564                 FILE_FULL_DIRECTORY_INFO * pFindData =
 565                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 566                 filename = &pFindData->FileName[0];
 567                 len = le32_to_cpu(pFindData->FileNameLength);
 568         } else if (cfile->srch_inf.info_level ==
 569                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 570                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 571                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 572                 filename = &pFindData->FileName[0];
 573                 len = le32_to_cpu(pFindData->FileNameLength);
 574         } else if (cfile->srch_inf.info_level ==
 575                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 576                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 577                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 578                 filename = &pFindData->FileName[0];
 579                 len = le32_to_cpu(pFindData->FileNameLength);
 580         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 581                 FIND_FILE_STANDARD_INFO * pFindData =
 582                         (FIND_FILE_STANDARD_INFO *)current_entry;
 583                 filename = &pFindData->FileName[0];
 584                 len = pFindData->FileNameLength;
 585         } else {
 586                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 587         }
 588
 589         if (filename) {
 590                 if (cfile->srch_inf.unicode) {
 591                         __le16 *ufilename = (__le16 *)filename;
 592                         if (len == 2) {
 593                                 /* check for . */
 594                                 if (ufilename[0] == UNICODE_DOT)
 595                                         rc = 1;
 596                         } else if (len == 4) {
 597                                 /* check for .. */
 598                                 if ((ufilename[0] == UNICODE_DOT)
 599                                    &&(ufilename[1] == UNICODE_DOT))
 600                                         rc = 2;
 601                         }
 602                 } else /* ASCII */ {
 603                         if (len == 1) {
 604                                 if (filename[0] == '.')
 605                                         rc = 1;
 606                         } else if (len == 2) {
 607                                 if((filename[0] == '.') && (filename[1] == '.'))
 608                                         rc = 2;
 609                         }
 610                 }
 611         }
 612
 613         return rc;
 614 }
 615
 616 /* Check if directory that we are searching has changed so we can decide
 617    whether we can use the cached search results from the previous search */
 618 static int is_dir_changed(struct file * file)
 619 {
 620         struct inode *inode = file->f_path.dentry->d_inode;
 621         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
 622
 623         if (cifsInfo->time == 0)
 624                 return 1; /* directory was changed, perhaps due to unlink */
 625         else
 626                 return 0;
 627
 628 }
 629
 630 /* find the corresponding entry in the search */
 631 /* Note that the SMB server returns search entries for . and .. which
 632    complicates logic here if we choose to parse for them and we do not
 633    assume that they are located in the findfirst return buffer.*/
 634 /* We start counting in the buffer with entry 2 and increment for every
 635    entry (do not increment for . or .. entry) */
 636 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 637         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 638 {
 639         int rc = 0;
 640         int pos_in_buf = 0;
 641         loff_t first_entry_in_buffer;
 642         loff_t index_to_find = file->f_pos;
 643         struct cifsFileInfo * cifsFile = file->private_data;
 644         /* check if index in the buffer */
 645
 646         if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 647            (num_to_ret == NULL))
 648                 return -ENOENT;
 649
 650         *ppCurrentEntry = NULL;
 651         first_entry_in_buffer =
 652                 cifsFile->srch_inf.index_of_last_entry -
 653                         cifsFile->srch_inf.entries_in_buffer;
 654
 655         /* if first entry in buf is zero then is first buffer
 656         in search response data which means it is likely . and ..
 657         will be in this buffer, although some servers do not return
 658         . and .. for the root of a drive and for those we need
 659         to start two entries earlier */
 660
 661 #ifdef CONFIG_CIFS_DEBUG2
 662         dump_cifs_file_struct(file, "In fce ");
 663 #endif
 664         if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 665              is_dir_changed(file)) ||
 666            (index_to_find < first_entry_in_buffer)) {
 667                 /* close and restart search */
 668                 cFYI(1,("search backing up - close and restart search"));
 669                 cifsFile->invalidHandle = TRUE;
 670                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 671                 kfree(cifsFile->search_resume_name);
 672                 cifsFile->search_resume_name = NULL;
 673                 if (cifsFile->srch_inf.ntwrk_buf_start) {
 674                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 675                         if (cifsFile->srch_inf.smallBuf)
 676                                 cifs_small_buf_release(cifsFile->srch_inf.
 677                                                 ntwrk_buf_start);
 678                         else
 679                                 cifs_buf_release(cifsFile->srch_inf.
 680                                                 ntwrk_buf_start);
 681                 }
 682                 rc = initiate_cifs_search(xid,file);
 683                 if (rc) {
 684                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 685                         return rc;
 686                 }
 687         }
 688
 689         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 690               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 691                 cFYI(1,("calling findnext2"));
 692                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 693                                   &cifsFile->srch_inf);
 694                 if (rc)
 695                         return -ENOENT;
 696         }
 697         if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 698                 /* we found the buffer that contains the entry */
 699                 /* scan and find it */
 700                 int i;
 701                 char * current_entry;
 702                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 703                         smbCalcSize((struct smb_hdr *)
 704                                 cifsFile->srch_inf.ntwrk_buf_start);
 705
 706                 current_entry = cifsFile->srch_inf.srch_entries_start;
 707                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 708                                         - cifsFile->srch_inf.entries_in_buffer;
 709                 pos_in_buf = index_to_find - first_entry_in_buffer;
 710                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 711
 712                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 713                         /* go entry by entry figuring out which is first */
 714                         current_entry = nxt_dir_entry(current_entry,end_of_smb,
 715                                                 cifsFile->srch_inf.info_level);
 716                 }
 717                 if((current_entry == NULL) && (i < pos_in_buf)) {
 718                         /* BB fixme - check if we should flag this error */
 719                         cERROR(1,("reached end of buf searching for pos in buf"
 720                           " %d index to find %lld rc %d",
 721                           pos_in_buf,index_to_find,rc));
 722                 }
 723                 rc = 0;
 724                 *ppCurrentEntry = current_entry;
 725         } else {
 726                 cFYI(1,("index not in buffer - could not findnext into it"));
 727                 return 0;
 728         }
 729
 730         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 731                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 732                 *num_to_ret = 0;
 733         } else
 734                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 735
 736         return rc;
 737 }
 738
 739 /* inode num, inode type and filename returned */
 740 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 741         char *current_entry, __u16 level, unsigned int unicode,
 742         struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
 743 {
 744         int rc = 0;
 745         unsigned int len = 0;
 746         char * filename;
 747         struct nls_table * nlt = cifs_sb->local_nls;
 748
 749         *pinum = 0;
 750
 751         if(level == SMB_FIND_FILE_UNIX) {
 752                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 753
 754                 filename = &pFindData->FileName[0];
 755                 if(unicode) {
 756                         len = cifs_unicode_bytelen(filename);
 757                 } else {
 758                         /* BB should we make this strnlen of PATH_MAX? */
 759                         len = strnlen(filename, PATH_MAX);
 760                 }
 761
 762                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 763                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 764                         *pinum = pFindData->UniqueId;
 765         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 766                 FILE_DIRECTORY_INFO * pFindData =
 767                         (FILE_DIRECTORY_INFO *)current_entry;
 768                 filename = &pFindData->FileName[0];
 769                 len = le32_to_cpu(pFindData->FileNameLength);
 770         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 771                 FILE_FULL_DIRECTORY_INFO * pFindData =
 772                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 773                 filename = &pFindData->FileName[0];
 774                 len = le32_to_cpu(pFindData->FileNameLength);
 775         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 776                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 777                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 778                 filename = &pFindData->FileName[0];
 779                 len = le32_to_cpu(pFindData->FileNameLength);
 780                 *pinum = pFindData->UniqueId;
 781         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 782                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 783                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 784                 filename = &pFindData->FileName[0];
 785                 len = le32_to_cpu(pFindData->FileNameLength);
 786         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 787                 FIND_FILE_STANDARD_INFO * pFindData =
 788                         (FIND_FILE_STANDARD_INFO *)current_entry;
 789                 filename = &pFindData->FileName[0];
 790                 /* one byte length, no name conversion */
 791                 len = (unsigned int)pFindData->FileNameLength;
 792         } else {
 793                 cFYI(1,("Unknown findfirst level %d",level));
 794                 return -EINVAL;
 795         }
 796
 797         if(len > max_len) {
 798                 cERROR(1,("bad search response length %d past smb end", len));
 799                 return -EINVAL;
 800         }
 801
 802         if(unicode) {
 803                 /* BB fixme - test with long names */
 804                 /* Note converted filename can be longer than in unicode */
 805                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 806                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 807                                         (__le16 *)filename, len/2, nlt);
 808                 else
 809                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 810                                         (__le16 *)filename,len/2,nlt);
 811         } else {
 812                 pqst->name = filename;
 813                 pqst->len = len;
 814         }
 815         pqst->hash = full_name_hash(pqst->name,pqst->len);
 816 /*      cFYI(1,("filldir on %s",pqst->name));  */
 817         return rc;
 818 }
 819
 820 static int cifs_filldir(char *pfindEntry, struct file *file,
 821         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 822 {
 823         int rc = 0;
 824         struct qstr qstring;
 825         struct cifsFileInfo * pCifsF;
 826         unsigned obj_type;
 827         ino_t  inum;
 828         struct cifs_sb_info * cifs_sb;
 829         struct inode *tmp_inode;
 830         struct dentry *tmp_dentry;
 831
 832         /* get filename and len into qstring */
 833         /* get dentry */
 834         /* decide whether to create and populate ionde */
 835         if((direntry == NULL) || (file == NULL))
 836                 return -EINVAL;
 837
 838         pCifsF = file->private_data;
 839
 840         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 841                 return -ENOENT;
 842
 843         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
 844         /* skip . and .. since we added them first */
 845         if(rc != 0)
 846                 return 0;
 847
 848         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 849
 850         qstring.name = scratch_buf;
 851         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 852                         pCifsF->srch_inf.info_level,
 853                         pCifsF->srch_inf.unicode,cifs_sb,
 854                         max_len,
 855                         &inum /* returned */);
 856
 857         if(rc)
 858                 return rc;
 859
 860         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 861         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 862                 return -ENOMEM;
 863
 864         if(rc) {
 865                 /* inode created, we need to hash it with right inode number */
 866                 if(inum != 0) {
 867                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 868                         tmp_inode->i_ino = inum;
 869                 }
 870                 insert_inode_hash(tmp_inode);
 871         }
 872
 873         /* we pass in rc below, indicating whether it is a new inode,
 874            so we can figure out whether to invalidate the inode cached
 875            data if the file has changed */
 876         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 877                 unix_fill_in_inode(tmp_inode,
 878                                    (FILE_UNIX_INFO *)pfindEntry,
 879                                    &obj_type, rc);
 880         else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 881                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 882                                 pfindEntry, &obj_type, rc);
 883         else
 884                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 885
 886         if(rc) /* new inode - needs to be tied to dentry */ {
 887                 d_instantiate(tmp_dentry, tmp_inode);
 888                 if(rc == 2)
 889                         d_rehash(tmp_dentry);
 890         }
 891
 892
 893         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 894                      tmp_inode->i_ino,obj_type);
 895         if(rc) {
 896                 cFYI(1,("filldir rc = %d",rc));
 897                 /* we can not return filldir errors to the caller
 898                 since they are "normal" when the stat blocksize
 899                 is too small - we return remapped error instead */
 900                 rc = -EOVERFLOW;
 901         }
 902
 903         dput(tmp_dentry);
 904         return rc;
 905 }
 906
 907 static int cifs_save_resume_key(const char *current_entry,
 908         struct cifsFileInfo *cifsFile)
 909 {
 910         int rc = 0;
 911         unsigned int len = 0;
 912         __u16 level;
 913         char * filename;
 914
 915         if((cifsFile == NULL) || (current_entry == NULL))
 916                 return -EINVAL;
 917
 918         level = cifsFile->srch_inf.info_level;
 919
 920         if(level == SMB_FIND_FILE_UNIX) {
 921                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 922
 923                 filename = &pFindData->FileName[0];
 924                 if(cifsFile->srch_inf.unicode) {
 925                         len = cifs_unicode_bytelen(filename);
 926                 } else {
 927                         /* BB should we make this strnlen of PATH_MAX? */
 928                         len = strnlen(filename, PATH_MAX);
 929                 }
 930                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 931         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 932                 FILE_DIRECTORY_INFO * pFindData =
 933                         (FILE_DIRECTORY_INFO *)current_entry;
 934                 filename = &pFindData->FileName[0];
 935                 len = le32_to_cpu(pFindData->FileNameLength);
 936                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 937         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 938                 FILE_FULL_DIRECTORY_INFO * pFindData =
 939                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 940                 filename = &pFindData->FileName[0];
 941                 len = le32_to_cpu(pFindData->FileNameLength);
 942                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 943         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 944                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 945                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 946                 filename = &pFindData->FileName[0];
 947                 len = le32_to_cpu(pFindData->FileNameLength);
 948                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 949         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 950                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 951                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 952                 filename = &pFindData->FileName[0];
 953                 len = le32_to_cpu(pFindData->FileNameLength);
 954                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 955         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 956                 FIND_FILE_STANDARD_INFO * pFindData =
 957                         (FIND_FILE_STANDARD_INFO *)current_entry;
 958                 filename = &pFindData->FileName[0];
 959                 /* one byte length, no name conversion */
 960                 len = (unsigned int)pFindData->FileNameLength;
 961                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 962         } else {
 963                 cFYI(1,("Unknown findfirst level %d",level));
 964                 return -EINVAL;
 965         }
 966         cifsFile->srch_inf.resume_name_len = len;
 967         cifsFile->srch_inf.presume_name = filename;
 968         return rc;
 969 }
 970
 971 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 972 {
 973         int rc = 0;
 974         int xid,i;
 975         struct cifs_sb_info *cifs_sb;
 976         struct cifsTconInfo *pTcon;
 977         struct cifsFileInfo *cifsFile = NULL;
 978         char * current_entry;
 979         int num_to_fill = 0;
 980         char * tmp_buf = NULL;
 981         char * end_of_smb;
 982         int max_len;
 983
 984         xid = GetXid();
 985
 986         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 987         pTcon = cifs_sb->tcon;
 988         if(pTcon == NULL)
 989                 return -EINVAL;
 990
 991         switch ((int) file->f_pos) {
 992         case 0:
 993                 if (filldir(direntry, ".", 1, file->f_pos,
 994                      file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
 995                         cERROR(1, ("Filldir for current dir failed"));
 996                         rc = -ENOMEM;
 997                         break;
 998                 }
 999                 file->f_pos++;
1000         case 1:
1001                 if (filldir(direntry, "..", 2, file->f_pos,
1002                      file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1003                         cERROR(1, ("Filldir for parent dir failed"));
1004                         rc = -ENOMEM;
1005                         break;
1006                 }
1007                 file->f_pos++;
1008         default:
1009                 /* 1) If search is active,
1010                         is in current search buffer?
1011                         if it before then restart search
1012                         if after then keep searching till find it */
1013
1014                 if(file->private_data == NULL) {
1015                         rc = initiate_cifs_search(xid,file);
1016                         cFYI(1,("initiate cifs search rc %d",rc));
1017                         if(rc) {
1018                                 FreeXid(xid);
1019                                 return rc;
1020                         }
1021                 }
1022                 if(file->private_data == NULL) {
1023                         rc = -EINVAL;
1024                         FreeXid(xid);
1025                         return rc;
1026                 }
1027                 cifsFile = file->private_data;
1028                 if (cifsFile->srch_inf.endOfSearch) {
1029                         if(cifsFile->srch_inf.emptyDir) {
1030                                 cFYI(1, ("End of search, empty dir"));
1031                                 rc = 0;
1032                                 break;
1033                         }
1034                 } /* else {
1035                         cifsFile->invalidHandle = TRUE;
1036                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1037                 }
1038                 kfree(cifsFile->search_resume_name);
1039                 cifsFile->search_resume_name = NULL; */
1040
1041                 rc = find_cifs_entry(xid,pTcon, file,
1042                                 &current_entry,&num_to_fill);
1043                 if(rc) {
1044                         cFYI(1,("fce error %d",rc));
1045                         goto rddir2_exit;
1046                 } else if (current_entry != NULL) {
1047                         cFYI(1,("entry %lld found",file->f_pos));
1048                 } else {
1049                         cFYI(1,("could not find entry"));
1050                         goto rddir2_exit;
1051                 }
1052                 cFYI(1,("loop through %d times filling dir for net buf %p",
1053                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1054                 max_len = smbCalcSize((struct smb_hdr *)
1055                                 cifsFile->srch_inf.ntwrk_buf_start);
1056                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1057
1058                 /* To be safe - for UCS to UTF-8 with strings loaded
1059                 with the rare long characters alloc more to account for
1060                 such multibyte target UTF-8 characters. cifs_unicode.c,
1061                 which actually does the conversion, has the same limit */
1062                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1063                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1064                         if(current_entry == NULL) {
1065                                 /* evaluate whether this case is an error */
1066                                 cERROR(1,("past end of SMB num to fill %d i %d",
1067                                           num_to_fill, i));
1068                                 break;
1069                         }
1070                         /* if buggy server returns . and .. late do
1071                         we want to check for that here? */
1072                         rc = cifs_filldir(current_entry, file,
1073                                         filldir, direntry, tmp_buf, max_len);
1074                         if(rc == -EOVERFLOW) {
1075                                 rc = 0;
1076                                 break;
1077                         }
1078
1079                         file->f_pos++;
1080                         if(file->f_pos ==
1081                                 cifsFile->srch_inf.index_of_last_entry) {
1082                                 cFYI(1,("last entry in buf at pos %lld %s",
1083                                         file->f_pos,tmp_buf));
1084                                 cifs_save_resume_key(current_entry,cifsFile);
1085                                 break;
1086                         } else
1087                                 current_entry =
1088                                         nxt_dir_entry(current_entry, end_of_smb,
1089                                                 cifsFile->srch_inf.info_level);
1090                 }
1091                 kfree(tmp_buf);
1092                 break;
1093         } /* end switch */
1094
1095 rddir2_exit:
1096         FreeXid(xid);
1097         return rc;
1098 }