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

   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004, 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 <linux/smp_lock.h>
  27 #include "cifspdu.h"
  28 #include "cifsglob.h"
  29 #include "cifsproto.h"
  30 #include "cifs_unicode.h"
  31 #include "cifs_debug.h"
  32 #include "cifs_fs_sb.h"
  33 #include "cifsfs.h"
  34
  35 #ifdef CONFIG_CIFS_DEBUG2
  36 static void dump_cifs_file_struct(struct file *file, char *label)
  37 {
  38         struct cifsFileInfo * cf;
  39
  40         if(file) {
  41                 cf = file->private_data;
  42                 if(cf == NULL) {
  43                         cFYI(1,("empty cifs private file data"));
  44                         return;
  45                 }
  46                 if(cf->invalidHandle) {
  47                         cFYI(1,("invalid handle"));
  48                 }
  49                 if(cf->srch_inf.endOfSearch) {
  50                         cFYI(1,("end of search"));
  51                 }
  52                 if(cf->srch_inf.emptyDir) {
  53                         cFYI(1,("empty dir"));
  54                 }
  55
  56         }
  57 }
  58 #endif /* DEBUG2 */
  59
  60 /* Returns one if new inode created (which therefore needs to be hashed) */
  61 /* Might check in the future if inode number changed so we can rehash inode */
  62 static int construct_dentry(struct qstr *qstring, struct file *file,
  63         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  64 {
  65         struct dentry *tmp_dentry;
  66         struct cifs_sb_info *cifs_sb;
  67         struct cifsTconInfo *pTcon;
  68         int rc = 0;
  69
  70         cFYI(1, ("For %s", qstring->name));
  71         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
  72         pTcon = cifs_sb->tcon;
  73
  74         qstring->hash = full_name_hash(qstring->name, qstring->len);
  75         tmp_dentry = d_lookup(file->f_path.dentry, qstring);
  76         if (tmp_dentry) {
  77                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
  78                 *ptmp_inode = tmp_dentry->d_inode;
  79 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
  80                 if(*ptmp_inode == NULL) {
  81                         *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
  82                         if(*ptmp_inode == NULL)
  83                                 return rc;
  84                         rc = 1;
  85                 }
  86                 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         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 361         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 362         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 363
 364         spin_lock(&tmp_inode->i_lock);
 365         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 366                 /* can not safely change the file size here if the
 367                 client is writing to it due to potential races */
 368                 i_size_write(tmp_inode, end_of_file);
 369
 370         /* 512 bytes (2**9) is the fake blocksize that must be used */
 371         /* for this calculation, not the real blocksize */
 372                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 373         }
 374         spin_unlock(&tmp_inode->i_lock);
 375
 376         if (S_ISREG(tmp_inode->i_mode)) {
 377                 cFYI(1, ("File inode"));
 378                 tmp_inode->i_op = &cifs_file_inode_ops;
 379
 380                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 381                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 382                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 383                         else
 384                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 385
 386                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 387                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 388                 else
 389                         tmp_inode->i_fop = &cifs_file_ops;
 390
 391                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 392                    (cifs_sb->tcon->ses->server->maxBuf <
 393                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 394                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 395                 else
 396                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 397
 398                 if(isNewInode)
 399                         return; /* No sense invalidating pages for new inode since we
 400                                            have not started caching readahead file data yet */
 401
 402                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 403                         (local_size == tmp_inode->i_size)) {
 404                         cFYI(1, ("inode exists but unchanged"));
 405                 } else {
 406                         /* file may have changed on server */
 407                         cFYI(1, ("invalidate inode, readdir detected change"));
 408                         invalidate_remote_inode(tmp_inode);
 409                 }
 410         } else if (S_ISDIR(tmp_inode->i_mode)) {
 411                 cFYI(1, ("Directory inode"));
 412                 tmp_inode->i_op = &cifs_dir_inode_ops;
 413                 tmp_inode->i_fop = &cifs_dir_ops;
 414         } else if (S_ISLNK(tmp_inode->i_mode)) {
 415                 cFYI(1, ("Symbolic Link inode"));
 416                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 417 /* tmp_inode->i_fop = *//* do not need to set to anything */
 418         } else {
 419                 cFYI(1, ("Special inode"));
 420                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 421                                    tmp_inode->i_rdev);
 422         }
 423 }
 424
 425 static int initiate_cifs_search(const int xid, struct file *file)
 426 {
 427         int rc = 0;
 428         char * full_path;
 429         struct cifsFileInfo * cifsFile;
 430         struct cifs_sb_info *cifs_sb;
 431         struct cifsTconInfo *pTcon;
 432
 433         if(file->private_data == NULL) {
 434                 file->private_data =
 435                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 436         }
 437
 438         if(file->private_data == NULL) {
 439                 return -ENOMEM;
 440         } else {
 441                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 442         }
 443         cifsFile = file->private_data;
 444         cifsFile->invalidHandle = TRUE;
 445         cifsFile->srch_inf.endOfSearch = FALSE;
 446
 447         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 448         if(cifs_sb == NULL)
 449                 return -EINVAL;
 450
 451         pTcon = cifs_sb->tcon;
 452         if(pTcon == NULL)
 453                 return -EINVAL;
 454
 455         full_path = build_path_from_dentry(file->f_path.dentry);
 456
 457         if(full_path == NULL) {
 458                 return -ENOMEM;
 459         }
 460
 461         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 462
 463 ffirst_retry:
 464         /* test for Unix extensions */
 465         if (pTcon->ses->capabilities & CAP_UNIX) {
 466                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 467         } else if ((pTcon->ses->capabilities &
 468                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 469                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 470         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 471                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 472         } else /* not srvinos - BB fixme add check for backlevel? */ {
 473                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 474         }
 475
 476         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 477                 &cifsFile->netfid, &cifsFile->srch_inf,
 478                 cifs_sb->mnt_cifs_flags &
 479                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 480         if(rc == 0)
 481                 cifsFile->invalidHandle = FALSE;
 482         if((rc == -EOPNOTSUPP) &&
 483                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 484                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 485                 goto ffirst_retry;
 486         }
 487         kfree(full_path);
 488         return rc;
 489 }
 490
 491 /* return length of unicode string in bytes */
 492 static int cifs_unicode_bytelen(char *str)
 493 {
 494         int len;
 495         __le16 * ustr = (__le16 *)str;
 496
 497         for(len=0;len <= PATH_MAX;len++) {
 498                 if(ustr[len] == 0)
 499                         return len << 1;
 500         }
 501         cFYI(1,("Unicode string longer than PATH_MAX found"));
 502         return len << 1;
 503 }
 504
 505 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 506 {
 507         char * new_entry;
 508         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 509
 510         if(level == SMB_FIND_FILE_INFO_STANDARD) {
 511                 FIND_FILE_STANDARD_INFO * pfData;
 512                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 513
 514                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 515                                 pfData->FileNameLength;
 516         } else
 517                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 518         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 519         /* validate that new_entry is not past end of SMB */
 520         if(new_entry >= end_of_smb) {
 521                 cERROR(1,
 522                       ("search entry %p began after end of SMB %p old entry %p",
 523                         new_entry, end_of_smb, old_entry));
 524                 return NULL;
 525         } else if(((level == SMB_FIND_FILE_INFO_STANDARD) &&
 526                    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
 527                   ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 528                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 529                 cERROR(1,("search entry %p extends after end of SMB %p",
 530                         new_entry, end_of_smb));
 531                 return NULL;
 532         } else
 533                 return new_entry;
 534
 535 }
 536
 537 #define UNICODE_DOT cpu_to_le16(0x2e)
 538
 539 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 540 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 541 {
 542         int rc = 0;
 543         char * filename = NULL;
 544         int len = 0;
 545
 546         if(cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 547                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 548                 filename = &pFindData->FileName[0];
 549                 if(cfile->srch_inf.unicode) {
 550                         len = cifs_unicode_bytelen(filename);
 551                 } else {
 552                         /* BB should we make this strnlen of PATH_MAX? */
 553                         len = strnlen(filename, 5);
 554                 }
 555         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 556                 FILE_DIRECTORY_INFO * pFindData =
 557                         (FILE_DIRECTORY_INFO *)current_entry;
 558                 filename = &pFindData->FileName[0];
 559                 len = le32_to_cpu(pFindData->FileNameLength);
 560         } else if(cfile->srch_inf.info_level ==
 561                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 562                 FILE_FULL_DIRECTORY_INFO * pFindData =
 563                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 564                 filename = &pFindData->FileName[0];
 565                 len = le32_to_cpu(pFindData->FileNameLength);
 566         } else if(cfile->srch_inf.info_level ==
 567                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 568                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 569                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 570                 filename = &pFindData->FileName[0];
 571                 len = le32_to_cpu(pFindData->FileNameLength);
 572         } else if(cfile->srch_inf.info_level ==
 573                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 574                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 575                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 576                 filename = &pFindData->FileName[0];
 577                 len = le32_to_cpu(pFindData->FileNameLength);
 578         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 579                 FIND_FILE_STANDARD_INFO * pFindData =
 580                         (FIND_FILE_STANDARD_INFO *)current_entry;
 581                 filename = &pFindData->FileName[0];
 582                 len = pFindData->FileNameLength;
 583         } else {
 584                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 585         }
 586
 587         if(filename) {
 588                 if(cfile->srch_inf.unicode) {
 589                         __le16 *ufilename = (__le16 *)filename;
 590                         if(len == 2) {
 591                                 /* check for . */
 592                                 if(ufilename[0] == UNICODE_DOT)
 593                                         rc = 1;
 594                         } else if(len == 4) {
 595                                 /* check for .. */
 596                                 if((ufilename[0] == UNICODE_DOT)
 597                                    &&(ufilename[1] == UNICODE_DOT))
 598                                         rc = 2;
 599                         }
 600                 } else /* ASCII */ {
 601                         if(len == 1) {
 602                                 if(filename[0] == '.')
 603                                         rc = 1;
 604                         } else if(len == 2) {
 605                                 if((filename[0] == '.') && (filename[1] == '.'))
 606                                         rc = 2;
 607                         }
 608                 }
 609         }
 610
 611         return rc;
 612 }
 613
 614 /* Check if directory that we are searching has changed so we can decide
 615    whether we can use the cached search results from the previous search */
 616 static int is_dir_changed(struct file * file)
 617 {
 618         struct inode *inode = file->f_path.dentry->d_inode;
 619         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
 620
 621         if (cifsInfo->time == 0)
 622                 return 1; /* directory was changed, perhaps due to unlink */
 623         else
 624                 return 0;
 625
 626 }
 627
 628 /* find the corresponding entry in the search */
 629 /* Note that the SMB server returns search entries for . and .. which
 630    complicates logic here if we choose to parse for them and we do not
 631    assume that they are located in the findfirst return buffer.*/
 632 /* We start counting in the buffer with entry 2 and increment for every
 633    entry (do not increment for . or .. entry) */
 634 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 635         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 636 {
 637         int rc = 0;
 638         int pos_in_buf = 0;
 639         loff_t first_entry_in_buffer;
 640         loff_t index_to_find = file->f_pos;
 641         struct cifsFileInfo * cifsFile = file->private_data;
 642         /* check if index in the buffer */
 643
 644         if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 645            (num_to_ret == NULL))
 646                 return -ENOENT;
 647
 648         *ppCurrentEntry = NULL;
 649         first_entry_in_buffer =
 650                 cifsFile->srch_inf.index_of_last_entry -
 651                         cifsFile->srch_inf.entries_in_buffer;
 652
 653         /* if first entry in buf is zero then is first buffer
 654         in search response data which means it is likely . and ..
 655         will be in this buffer, although some servers do not return
 656         . and .. for the root of a drive and for those we need
 657         to start two entries earlier */
 658
 659 #ifdef CONFIG_CIFS_DEBUG2
 660         dump_cifs_file_struct(file, "In fce ");
 661 #endif
 662         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 663              is_dir_changed(file)) ||
 664            (index_to_find < first_entry_in_buffer)) {
 665                 /* close and restart search */
 666                 cFYI(1,("search backing up - close and restart search"));
 667                 cifsFile->invalidHandle = TRUE;
 668                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 669                 kfree(cifsFile->search_resume_name);
 670                 cifsFile->search_resume_name = NULL;
 671                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 672                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 673                         if(cifsFile->srch_inf.smallBuf)
 674                                 cifs_small_buf_release(cifsFile->srch_inf.
 675                                                 ntwrk_buf_start);
 676                         else
 677                                 cifs_buf_release(cifsFile->srch_inf.
 678                                                 ntwrk_buf_start);
 679                 }
 680                 rc = initiate_cifs_search(xid,file);
 681                 if(rc) {
 682                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 683                         return rc;
 684                 }
 685         }
 686
 687         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 688               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 689                 cFYI(1,("calling findnext2"));
 690                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 691                                   &cifsFile->srch_inf);
 692                 if(rc)
 693                         return -ENOENT;
 694         }
 695         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 696                 /* we found the buffer that contains the entry */
 697                 /* scan and find it */
 698                 int i;
 699                 char * current_entry;
 700                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 701                         smbCalcSize((struct smb_hdr *)
 702                                 cifsFile->srch_inf.ntwrk_buf_start);
 703
 704                 current_entry = cifsFile->srch_inf.srch_entries_start;
 705                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 706                                         - cifsFile->srch_inf.entries_in_buffer;
 707                 pos_in_buf = index_to_find - first_entry_in_buffer;
 708                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 709
 710                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 711                         /* go entry by entry figuring out which is first */
 712                         current_entry = nxt_dir_entry(current_entry,end_of_smb,
 713                                                 cifsFile->srch_inf.info_level);
 714                 }
 715                 if((current_entry == NULL) && (i < pos_in_buf)) {
 716                         /* BB fixme - check if we should flag this error */
 717                         cERROR(1,("reached end of buf searching for pos in buf"
 718                           " %d index to find %lld rc %d",
 719                           pos_in_buf,index_to_find,rc));
 720                 }
 721                 rc = 0;
 722                 *ppCurrentEntry = current_entry;
 723         } else {
 724                 cFYI(1,("index not in buffer - could not findnext into it"));
 725                 return 0;
 726         }
 727
 728         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 729                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 730                 *num_to_ret = 0;
 731         } else
 732                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 733
 734         return rc;
 735 }
 736
 737 /* inode num, inode type and filename returned */
 738 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 739         char *current_entry, __u16 level, unsigned int unicode,
 740         struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
 741 {
 742         int rc = 0;
 743         unsigned int len = 0;
 744         char * filename;
 745         struct nls_table * nlt = cifs_sb->local_nls;
 746
 747         *pinum = 0;
 748
 749         if(level == SMB_FIND_FILE_UNIX) {
 750                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 751
 752                 filename = &pFindData->FileName[0];
 753                 if(unicode) {
 754                         len = cifs_unicode_bytelen(filename);
 755                 } else {
 756                         /* BB should we make this strnlen of PATH_MAX? */
 757                         len = strnlen(filename, PATH_MAX);
 758                 }
 759
 760                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 761                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 762                         *pinum = pFindData->UniqueId;
 763         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 764                 FILE_DIRECTORY_INFO * pFindData =
 765                         (FILE_DIRECTORY_INFO *)current_entry;
 766                 filename = &pFindData->FileName[0];
 767                 len = le32_to_cpu(pFindData->FileNameLength);
 768         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 769                 FILE_FULL_DIRECTORY_INFO * pFindData =
 770                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 771                 filename = &pFindData->FileName[0];
 772                 len = le32_to_cpu(pFindData->FileNameLength);
 773         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 774                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 775                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 776                 filename = &pFindData->FileName[0];
 777                 len = le32_to_cpu(pFindData->FileNameLength);
 778                 *pinum = pFindData->UniqueId;
 779         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 780                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 781                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 782                 filename = &pFindData->FileName[0];
 783                 len = le32_to_cpu(pFindData->FileNameLength);
 784         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 785                 FIND_FILE_STANDARD_INFO * pFindData =
 786                         (FIND_FILE_STANDARD_INFO *)current_entry;
 787                 filename = &pFindData->FileName[0];
 788                 /* one byte length, no name conversion */
 789                 len = (unsigned int)pFindData->FileNameLength;
 790         } else {
 791                 cFYI(1,("Unknown findfirst level %d",level));
 792                 return -EINVAL;
 793         }
 794
 795         if(len > max_len) {
 796                 cERROR(1,("bad search response length %d past smb end", len));
 797                 return -EINVAL;
 798         }
 799
 800         if(unicode) {
 801                 /* BB fixme - test with long names */
 802                 /* Note converted filename can be longer than in unicode */
 803                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 804                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 805                                         (__le16 *)filename, len/2, nlt);
 806                 else
 807                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 808                                         (__le16 *)filename,len/2,nlt);
 809         } else {
 810                 pqst->name = filename;
 811                 pqst->len = len;
 812         }
 813         pqst->hash = full_name_hash(pqst->name,pqst->len);
 814 /*      cFYI(1,("filldir on %s",pqst->name));  */
 815         return rc;
 816 }
 817
 818 static int cifs_filldir(char *pfindEntry, struct file *file,
 819         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 820 {
 821         int rc = 0;
 822         struct qstr qstring;
 823         struct cifsFileInfo * pCifsF;
 824         unsigned obj_type;
 825         ino_t  inum;
 826         struct cifs_sb_info * cifs_sb;
 827         struct inode *tmp_inode;
 828         struct dentry *tmp_dentry;
 829
 830         /* get filename and len into qstring */
 831         /* get dentry */
 832         /* decide whether to create and populate ionde */
 833         if((direntry == NULL) || (file == NULL))
 834                 return -EINVAL;
 835
 836         pCifsF = file->private_data;
 837
 838         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 839                 return -ENOENT;
 840
 841         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
 842         /* skip . and .. since we added them first */
 843         if(rc != 0)
 844                 return 0;
 845
 846         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 847
 848         qstring.name = scratch_buf;
 849         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 850                         pCifsF->srch_inf.info_level,
 851                         pCifsF->srch_inf.unicode,cifs_sb,
 852                         max_len,
 853                         &inum /* returned */);
 854
 855         if(rc)
 856                 return rc;
 857
 858         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 859         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 860                 return -ENOMEM;
 861
 862         if(rc) {
 863                 /* inode created, we need to hash it with right inode number */
 864                 if(inum != 0) {
 865                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 866                         tmp_inode->i_ino = inum;
 867                 }
 868                 insert_inode_hash(tmp_inode);
 869         }
 870
 871         /* we pass in rc below, indicating whether it is a new inode,
 872            so we can figure out whether to invalidate the inode cached
 873            data if the file has changed */
 874         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 875                 unix_fill_in_inode(tmp_inode,
 876                                    (FILE_UNIX_INFO *)pfindEntry,
 877                                    &obj_type, rc);
 878         else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 879                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 880                                 pfindEntry, &obj_type, rc);
 881         else
 882                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 883
 884         if(rc) /* new inode - needs to be tied to dentry */ {
 885                 d_instantiate(tmp_dentry, tmp_inode);
 886                 if(rc == 2)
 887                         d_rehash(tmp_dentry);
 888         }
 889
 890
 891         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 892                      tmp_inode->i_ino,obj_type);
 893         if(rc) {
 894                 cFYI(1,("filldir rc = %d",rc));
 895                 /* we can not return filldir errors to the caller
 896                 since they are "normal" when the stat blocksize
 897                 is too small - we return remapped error instead */
 898                 rc = -EOVERFLOW;
 899         }
 900
 901         dput(tmp_dentry);
 902         return rc;
 903 }
 904
 905 static int cifs_save_resume_key(const char *current_entry,
 906         struct cifsFileInfo *cifsFile)
 907 {
 908         int rc = 0;
 909         unsigned int len = 0;
 910         __u16 level;
 911         char * filename;
 912
 913         if((cifsFile == NULL) || (current_entry == NULL))
 914                 return -EINVAL;
 915
 916         level = cifsFile->srch_inf.info_level;
 917
 918         if(level == SMB_FIND_FILE_UNIX) {
 919                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 920
 921                 filename = &pFindData->FileName[0];
 922                 if(cifsFile->srch_inf.unicode) {
 923                         len = cifs_unicode_bytelen(filename);
 924                 } else {
 925                         /* BB should we make this strnlen of PATH_MAX? */
 926                         len = strnlen(filename, PATH_MAX);
 927                 }
 928                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 929         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 930                 FILE_DIRECTORY_INFO * pFindData =
 931                         (FILE_DIRECTORY_INFO *)current_entry;
 932                 filename = &pFindData->FileName[0];
 933                 len = le32_to_cpu(pFindData->FileNameLength);
 934                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 935         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 936                 FILE_FULL_DIRECTORY_INFO * pFindData =
 937                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 938                 filename = &pFindData->FileName[0];
 939                 len = le32_to_cpu(pFindData->FileNameLength);
 940                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 941         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 942                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 943                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 944                 filename = &pFindData->FileName[0];
 945                 len = le32_to_cpu(pFindData->FileNameLength);
 946                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 947         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 948                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 949                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 950                 filename = &pFindData->FileName[0];
 951                 len = le32_to_cpu(pFindData->FileNameLength);
 952                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 953         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 954                 FIND_FILE_STANDARD_INFO * pFindData =
 955                         (FIND_FILE_STANDARD_INFO *)current_entry;
 956                 filename = &pFindData->FileName[0];
 957                 /* one byte length, no name conversion */
 958                 len = (unsigned int)pFindData->FileNameLength;
 959                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 960         } else {
 961                 cFYI(1,("Unknown findfirst level %d",level));
 962                 return -EINVAL;
 963         }
 964         cifsFile->srch_inf.resume_name_len = len;
 965         cifsFile->srch_inf.presume_name = filename;
 966         return rc;
 967 }
 968
 969 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 970 {
 971         int rc = 0;
 972         int xid,i;
 973         struct cifs_sb_info *cifs_sb;
 974         struct cifsTconInfo *pTcon;
 975         struct cifsFileInfo *cifsFile = NULL;
 976         char * current_entry;
 977         int num_to_fill = 0;
 978         char * tmp_buf = NULL;
 979         char * end_of_smb;
 980         int max_len;
 981
 982         xid = GetXid();
 983
 984         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 985         pTcon = cifs_sb->tcon;
 986         if(pTcon == NULL)
 987                 return -EINVAL;
 988
 989         switch ((int) file->f_pos) {
 990         case 0:
 991                 if (filldir(direntry, ".", 1, file->f_pos,
 992                      file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
 993                         cERROR(1, ("Filldir for current dir failed"));
 994                         rc = -ENOMEM;
 995                         break;
 996                 }
 997                 file->f_pos++;
 998         case 1:
 999                 if (filldir(direntry, "..", 2, file->f_pos,
1000                      file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1001                         cERROR(1, ("Filldir for parent dir failed"));
1002                         rc = -ENOMEM;
1003                         break;
1004                 }
1005                 file->f_pos++;
1006         default:
1007                 /* 1) If search is active,
1008                         is in current search buffer?
1009                         if it before then restart search
1010                         if after then keep searching till find it */
1011
1012                 if(file->private_data == NULL) {
1013                         rc = initiate_cifs_search(xid,file);
1014                         cFYI(1,("initiate cifs search rc %d",rc));
1015                         if(rc) {
1016                                 FreeXid(xid);
1017                                 return rc;
1018                         }
1019                 }
1020                 if(file->private_data == NULL) {
1021                         rc = -EINVAL;
1022                         FreeXid(xid);
1023                         return rc;
1024                 }
1025                 cifsFile = file->private_data;
1026                 if (cifsFile->srch_inf.endOfSearch) {
1027                         if(cifsFile->srch_inf.emptyDir) {
1028                                 cFYI(1, ("End of search, empty dir"));
1029                                 rc = 0;
1030                                 break;
1031                         }
1032                 } /* else {
1033                         cifsFile->invalidHandle = TRUE;
1034                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1035                 }
1036                 kfree(cifsFile->search_resume_name);
1037                 cifsFile->search_resume_name = NULL; */
1038
1039                 rc = find_cifs_entry(xid,pTcon, file,
1040                                 &current_entry,&num_to_fill);
1041                 if(rc) {
1042                         cFYI(1,("fce error %d",rc));
1043                         goto rddir2_exit;
1044                 } else if (current_entry != NULL) {
1045                         cFYI(1,("entry %lld found",file->f_pos));
1046                 } else {
1047                         cFYI(1,("could not find entry"));
1048                         goto rddir2_exit;
1049                 }
1050                 cFYI(1,("loop through %d times filling dir for net buf %p",
1051                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1052                 max_len = smbCalcSize((struct smb_hdr *)
1053                                 cifsFile->srch_inf.ntwrk_buf_start);
1054                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1055
1056                 /* To be safe - for UCS to UTF-8 with strings loaded
1057                 with the rare long characters alloc more to account for
1058                 such multibyte target UTF-8 characters. cifs_unicode.c,
1059                 which actually does the conversion, has the same limit */
1060                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1061                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1062                         if(current_entry == NULL) {
1063                                 /* evaluate whether this case is an error */
1064                                 cERROR(1,("past end of SMB num to fill %d i %d",
1065                                           num_to_fill, i));
1066                                 break;
1067                         }
1068                         /* if buggy server returns . and .. late do
1069                         we want to check for that here? */
1070                         rc = cifs_filldir(current_entry, file,
1071                                         filldir, direntry, tmp_buf, max_len);
1072                         if(rc == -EOVERFLOW) {
1073                                 rc = 0;
1074                                 break;
1075                         }
1076
1077                         file->f_pos++;
1078                         if(file->f_pos ==
1079                                 cifsFile->srch_inf.index_of_last_entry) {
1080                                 cFYI(1,("last entry in buf at pos %lld %s",
1081                                         file->f_pos,tmp_buf));
1082                                 cifs_save_resume_key(current_entry,cifsFile);
1083                                 break;
1084                         } else
1085                                 current_entry =
1086                                         nxt_dir_entry(current_entry, end_of_smb,
1087                                                 cifsFile->srch_inf.info_level);
1088                 }
1089                 kfree(tmp_buf);
1090                 break;
1091         } /* end switch */
1092
1093 rddir2_exit:
1094         FreeXid(xid);
1095         return rc;
1096 }