fs/cifs/readdir.c

   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004, 2005
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <linux/fs.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/stat.h>
  26 #include <linux/smp_lock.h>
  27 #include "cifspdu.h"
  28 #include "cifsglob.h"
  29 #include "cifsproto.h"
  30 #include "cifs_unicode.h"
  31 #include "cifs_debug.h"
  32 #include "cifs_fs_sb.h"
  33 #include "cifsfs.h"
  34
  35 #ifdef CONFIG_CIFS_DEBUG2
  36 static void dump_cifs_file_struct(struct file *file, char *label)
  37 {
  38         struct cifsFileInfo * cf;
  39
  40         if(file) {
  41                 cf = file->private_data;
  42                 if(cf == NULL) {
  43                         cFYI(1,("empty cifs private file data"));
  44                         return;
  45                 }
  46                 if(cf->invalidHandle) {
  47                         cFYI(1,("invalid handle"));
  48                 }
  49                 if(cf->srch_inf.endOfSearch) {
  50                         cFYI(1,("end of search"));
  51                 }
  52                 if(cf->srch_inf.emptyDir) {
  53                         cFYI(1,("empty dir"));
  54                 }
  55
  56         }
  57 }
  58 #endif /* DEBUG2 */
  59
  60 /* Returns one if new inode created (which therefore needs to be hashed) */
  61 /* Might check in the future if inode number changed so we can rehash inode */
  62 static int construct_dentry(struct qstr *qstring, struct file *file,
  63         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  64 {
  65         struct dentry *tmp_dentry;
  66         struct cifs_sb_info *cifs_sb;
  67         struct cifsTconInfo *pTcon;
  68         int rc = 0;
  69
  70         cFYI(1, ("For %s", qstring->name));
  71         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
  72         pTcon = cifs_sb->tcon;
  73
  74         qstring->hash = full_name_hash(qstring->name, qstring->len);
  75         tmp_dentry = d_lookup(file->f_path.dentry, qstring);
  76         if (tmp_dentry) {
  77                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
  78                 *ptmp_inode = tmp_dentry->d_inode;
  79 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
  80                 if(*ptmp_inode == NULL) {
  81                         *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
  82                         if(*ptmp_inode == NULL)
  83                                 return rc;
  84                         rc = 1;
  85                 }
  86         } else {
  87                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
  88                 if(tmp_dentry == NULL) {
  89                         cERROR(1,("Failed allocating dentry"));
  90                         *ptmp_inode = NULL;
  91                         return rc;
  92                 }
  93
  94                 *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
  95                 if (pTcon->nocase)
  96                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
  97                 else
  98                         tmp_dentry->d_op = &cifs_dentry_ops;
  99                 if(*ptmp_inode == NULL)
 100                         return rc;
 101                 rc = 2;
 102         }
 103
 104         tmp_dentry->d_time = jiffies;
 105         *pnew_dentry = tmp_dentry;
 106         return rc;
 107 }
 108
 109 static void AdjustForTZ(struct cifsTconInfo * tcon, struct inode * inode)
 110 {
 111         if((tcon) && (tcon->ses) && (tcon->ses->server)) {
 112                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
 113                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
 114                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
 115         }
 116         return;
 117 }
 118
 119
 120 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
 121                 char * buf, int *pobject_type, int isNewInode)
 122 {
 123         loff_t local_size;
 124         struct timespec local_mtime;
 125
 126         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 127         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 128         __u32 attr;
 129         __u64 allocation_size;
 130         __u64 end_of_file;
 131
 132         /* save mtime and size */
 133         local_mtime = tmp_inode->i_mtime;
 134         local_size  = tmp_inode->i_size;
 135
 136         if(new_buf_type) {
 137                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
 138
 139                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 140                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 141                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 142                 tmp_inode->i_atime =
 143                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 144                 tmp_inode->i_mtime =
 145                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 146                 tmp_inode->i_ctime =
 147                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 148         } else { /* legacy, OS2 and DOS style */
 149 /*              struct timespec ts;*/
 150                 FIND_FILE_STANDARD_INFO * pfindData =
 151                         (FIND_FILE_STANDARD_INFO *)buf;
 152
 153                 tmp_inode->i_mtime = cnvrtDosUnixTm(
 154                                 le16_to_cpu(pfindData->LastWriteDate),
 155                                 le16_to_cpu(pfindData->LastWriteTime));
 156                 tmp_inode->i_atime = cnvrtDosUnixTm(
 157                                 le16_to_cpu(pfindData->LastAccessDate),
 158                                 le16_to_cpu(pfindData->LastAccessTime));
 159                 tmp_inode->i_ctime = cnvrtDosUnixTm(
 160                                 le16_to_cpu(pfindData->LastWriteDate),
 161                                 le16_to_cpu(pfindData->LastWriteTime));
 162                 AdjustForTZ(cifs_sb->tcon, tmp_inode);
 163                 attr = le16_to_cpu(pfindData->Attributes);
 164                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
 165                 end_of_file = le32_to_cpu(pfindData->DataSize);
 166         }
 167
 168         /* Linux can not store file creation time unfortunately so ignore it */
 169
 170         cifsInfo->cifsAttrs = attr;
 171         cifsInfo->time = jiffies;
 172
 173         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 174         /* 2767 perms - indicate mandatory locking */
 175                 /* BB fill in uid and gid here? with help from winbind?
 176                    or retrieve from NTFS stream extended attribute */
 177         if (atomic_read(&cifsInfo->inUse) == 0) {
 178                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 179                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 180                 /* set default mode. will override for dirs below */
 181                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 182         } else {
 183                 /* mask off the type bits since it gets set
 184                 below and we do not want to get two type
 185                 bits set */
 186                 tmp_inode->i_mode &= ~S_IFMT;
 187         }
 188
 189         if (attr & ATTR_DIRECTORY) {
 190                 *pobject_type = DT_DIR;
 191                 /* override default perms since we do not lock dirs */
 192                 if(atomic_read(&cifsInfo->inUse) == 0) {
 193                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 194                 }
 195                 tmp_inode->i_mode |= S_IFDIR;
 196         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 197                    (attr & ATTR_SYSTEM)) {
 198                 if (end_of_file == 0)  {
 199                         *pobject_type = DT_FIFO;
 200                         tmp_inode->i_mode |= S_IFIFO;
 201                 } else {
 202                         /* rather than get the type here, we mark the
 203                         inode as needing revalidate and get the real type
 204                         (blk vs chr vs. symlink) later ie in lookup */
 205                         *pobject_type = DT_REG;
 206                         tmp_inode->i_mode |= S_IFREG;
 207                         cifsInfo->time = 0;
 208                 }
 209 /* we no longer mark these because we could not follow them */
 210 /*        } else if (attr & ATTR_REPARSE) {
 211                 *pobject_type = DT_LNK;
 212                 tmp_inode->i_mode |= S_IFLNK; */
 213         } else {
 214                 *pobject_type = DT_REG;
 215                 tmp_inode->i_mode |= S_IFREG;
 216                 if (attr & ATTR_READONLY)
 217                         tmp_inode->i_mode &= ~(S_IWUGO);
 218                 else if ((tmp_inode->i_mode & S_IWUGO) == 0)
 219                         /* the ATTR_READONLY flag may have been changed on   */
 220                         /* server -- set any w bits allowed by mnt_file_mode */
 221                         tmp_inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
 222         } /* could add code here - to validate if device or weird share type? */
 223
 224         /* can not fill in nlink here as in qpathinfo version and Unx search */
 225         if (atomic_read(&cifsInfo->inUse) == 0) {
 226                 atomic_set(&cifsInfo->inUse, 1);
 227         }
 228
 229         if (is_size_safe_to_change(cifsInfo)) {
 230                 /* can not safely change the file size here if the
 231                 client is writing to it due to potential races */
 232                 i_size_write(tmp_inode, end_of_file);
 233
 234         /* 512 bytes (2**9) is the fake blocksize that must be used */
 235         /* for this calculation, even though the reported blocksize is larger */
 236                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 237         }
 238
 239         if (allocation_size < end_of_file)
 240                 cFYI(1, ("May be sparse file, allocation less than file size"));
 241         cFYI(1, ("File Size %ld and blocks %llu",
 242                 (unsigned long)tmp_inode->i_size,
 243                 (unsigned long long)tmp_inode->i_blocks));
 244         if (S_ISREG(tmp_inode->i_mode)) {
 245                 cFYI(1, ("File inode"));
 246                 tmp_inode->i_op = &cifs_file_inode_ops;
 247                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 248                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 249                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 250                         else
 251                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 252
 253                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 254                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 255                 else
 256                         tmp_inode->i_fop = &cifs_file_ops;
 257
 258                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 259                    (cifs_sb->tcon->ses->server->maxBuf <
 260                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 261                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 262                 else
 263                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 264
 265                 if(isNewInode)
 266                         return; /* No sense invalidating pages for new inode
 267                                    since have not started caching readahead file
 268                                    data yet */
 269
 270                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 271                         (local_size == tmp_inode->i_size)) {
 272                         cFYI(1, ("inode exists but unchanged"));
 273                 } else {
 274                         /* file may have changed on server */
 275                         cFYI(1, ("invalidate inode, readdir detected change"));
 276                         invalidate_remote_inode(tmp_inode);
 277                 }
 278         } else if (S_ISDIR(tmp_inode->i_mode)) {
 279                 cFYI(1, ("Directory inode"));
 280                 tmp_inode->i_op = &cifs_dir_inode_ops;
 281                 tmp_inode->i_fop = &cifs_dir_ops;
 282         } else if (S_ISLNK(tmp_inode->i_mode)) {
 283                 cFYI(1, ("Symbolic Link inode"));
 284                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 285         } else {
 286                 cFYI(1, ("Init special inode"));
 287                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 288                                    tmp_inode->i_rdev);
 289         }
 290 }
 291
 292 static void unix_fill_in_inode(struct inode *tmp_inode,
 293         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 294 {
 295         loff_t local_size;
 296         struct timespec local_mtime;
 297
 298         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 299         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 300
 301         __u32 type = le32_to_cpu(pfindData->Type);
 302         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 303         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 304         cifsInfo->time = jiffies;
 305         atomic_inc(&cifsInfo->inUse);
 306
 307         /* save mtime and size */
 308         local_mtime = tmp_inode->i_mtime;
 309         local_size  = tmp_inode->i_size;
 310
 311         tmp_inode->i_atime =
 312             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 313         tmp_inode->i_mtime =
 314             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 315         tmp_inode->i_ctime =
 316             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 317
 318         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 319         /* since we set the inode type below we need to mask off type
 320            to avoid strange results if bits above were corrupt */
 321         tmp_inode->i_mode &= ~S_IFMT;
 322         if (type == UNIX_FILE) {
 323                 *pobject_type = DT_REG;
 324                 tmp_inode->i_mode |= S_IFREG;
 325         } else if (type == UNIX_SYMLINK) {
 326                 *pobject_type = DT_LNK;
 327                 tmp_inode->i_mode |= S_IFLNK;
 328         } else if (type == UNIX_DIR) {
 329                 *pobject_type = DT_DIR;
 330                 tmp_inode->i_mode |= S_IFDIR;
 331         } else if (type == UNIX_CHARDEV) {
 332                 *pobject_type = DT_CHR;
 333                 tmp_inode->i_mode |= S_IFCHR;
 334                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 335                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 336         } else if (type == UNIX_BLOCKDEV) {
 337                 *pobject_type = DT_BLK;
 338                 tmp_inode->i_mode |= S_IFBLK;
 339                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 340                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 341         } else if (type == UNIX_FIFO) {
 342                 *pobject_type = DT_FIFO;
 343                 tmp_inode->i_mode |= S_IFIFO;
 344         } else if (type == UNIX_SOCKET) {
 345                 *pobject_type = DT_SOCK;
 346                 tmp_inode->i_mode |= S_IFSOCK;
 347         } else {
 348                 /* safest to just call it a file */
 349                 *pobject_type = DT_REG;
 350                 tmp_inode->i_mode |= S_IFREG;
 351                 cFYI(1,("unknown inode type %d",type));
 352         }
 353
 354         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 355         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 356         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 357
 358         if (is_size_safe_to_change(cifsInfo)) {
 359                 /* can not safely change the file size here if the
 360                 client is writing to it due to potential races */
 361                 i_size_write(tmp_inode,end_of_file);
 362
 363         /* 512 bytes (2**9) is the fake blocksize that must be used */
 364         /* for this calculation, not the real blocksize */
 365                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 366         }
 367
 368         if (S_ISREG(tmp_inode->i_mode)) {
 369                 cFYI(1, ("File inode"));
 370                 tmp_inode->i_op = &cifs_file_inode_ops;
 371
 372                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 373                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 374                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 375                         else
 376                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 377
 378                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 379                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 380                 else
 381                         tmp_inode->i_fop = &cifs_file_ops;
 382
 383                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 384                    (cifs_sb->tcon->ses->server->maxBuf <
 385                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 386                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 387                 else
 388                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 389
 390                 if(isNewInode)
 391                         return; /* No sense invalidating pages for new inode since we
 392                                            have not started caching readahead file data yet */
 393
 394                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 395                         (local_size == tmp_inode->i_size)) {
 396                         cFYI(1, ("inode exists but unchanged"));
 397                 } else {
 398                         /* file may have changed on server */
 399                         cFYI(1, ("invalidate inode, readdir detected change"));
 400                         invalidate_remote_inode(tmp_inode);
 401                 }
 402         } else if (S_ISDIR(tmp_inode->i_mode)) {
 403                 cFYI(1, ("Directory inode"));
 404                 tmp_inode->i_op = &cifs_dir_inode_ops;
 405                 tmp_inode->i_fop = &cifs_dir_ops;
 406         } else if (S_ISLNK(tmp_inode->i_mode)) {
 407                 cFYI(1, ("Symbolic Link inode"));
 408                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 409 /* tmp_inode->i_fop = *//* do not need to set to anything */
 410         } else {
 411                 cFYI(1, ("Special inode"));
 412                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 413                                    tmp_inode->i_rdev);
 414         }
 415 }
 416
 417 static int initiate_cifs_search(const int xid, struct file *file)
 418 {
 419         int rc = 0;
 420         char * full_path;
 421         struct cifsFileInfo * cifsFile;
 422         struct cifs_sb_info *cifs_sb;
 423         struct cifsTconInfo *pTcon;
 424
 425         if(file->private_data == NULL) {
 426                 file->private_data =
 427                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 428         }
 429
 430         if(file->private_data == NULL) {
 431                 return -ENOMEM;
 432         } else {
 433                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 434         }
 435         cifsFile = file->private_data;
 436         cifsFile->invalidHandle = TRUE;
 437         cifsFile->srch_inf.endOfSearch = FALSE;
 438
 439         if(file->f_path.dentry == NULL)
 440                 return -ENOENT;
 441
 442         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 443         if(cifs_sb == NULL)
 444                 return -EINVAL;
 445
 446         pTcon = cifs_sb->tcon;
 447         if(pTcon == NULL)
 448                 return -EINVAL;
 449
 450         full_path = build_path_from_dentry(file->f_path.dentry);
 451
 452         if(full_path == NULL) {
 453                 return -ENOMEM;
 454         }
 455
 456         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 457
 458 ffirst_retry:
 459         /* test for Unix extensions */
 460         if (pTcon->ses->capabilities & CAP_UNIX) {
 461                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 462         } else if ((pTcon->ses->capabilities &
 463                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 464                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 465         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 466                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 467         } else /* not srvinos - BB fixme add check for backlevel? */ {
 468                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 469         }
 470
 471         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 472                 &cifsFile->netfid, &cifsFile->srch_inf,
 473                 cifs_sb->mnt_cifs_flags &
 474                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 475         if(rc == 0)
 476                 cifsFile->invalidHandle = FALSE;
 477         if((rc == -EOPNOTSUPP) &&
 478                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 479                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 480                 goto ffirst_retry;
 481         }
 482         kfree(full_path);
 483         return rc;
 484 }
 485
 486 /* return length of unicode string in bytes */
 487 static int cifs_unicode_bytelen(char *str)
 488 {
 489         int len;
 490         __le16 * ustr = (__le16 *)str;
 491
 492         for(len=0;len <= PATH_MAX;len++) {
 493                 if(ustr[len] == 0)
 494                         return len << 1;
 495         }
 496         cFYI(1,("Unicode string longer than PATH_MAX found"));
 497         return len << 1;
 498 }
 499
 500 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 501 {
 502         char * new_entry;
 503         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 504
 505         if(level == SMB_FIND_FILE_INFO_STANDARD) {
 506                 FIND_FILE_STANDARD_INFO * pfData;
 507                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 508
 509                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 510                                 pfData->FileNameLength;
 511         } else
 512                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 513         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 514         /* validate that new_entry is not past end of SMB */
 515         if(new_entry >= end_of_smb) {
 516                 cERROR(1,
 517                       ("search entry %p began after end of SMB %p old entry %p",
 518                         new_entry, end_of_smb, old_entry));
 519                 return NULL;
 520         } else if(((level == SMB_FIND_FILE_INFO_STANDARD) &&
 521                    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
 522                   ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 523                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 524                 cERROR(1,("search entry %p extends after end of SMB %p",
 525                         new_entry, end_of_smb));
 526                 return NULL;
 527         } else
 528                 return new_entry;
 529
 530 }
 531
 532 #define UNICODE_DOT cpu_to_le16(0x2e)
 533
 534 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 535 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 536 {
 537         int rc = 0;
 538         char * filename = NULL;
 539         int len = 0;
 540
 541         if(cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 542                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 543                 filename = &pFindData->FileName[0];
 544                 if(cfile->srch_inf.unicode) {
 545                         len = cifs_unicode_bytelen(filename);
 546                 } else {
 547                         /* BB should we make this strnlen of PATH_MAX? */
 548                         len = strnlen(filename, 5);
 549                 }
 550         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 551                 FILE_DIRECTORY_INFO * pFindData =
 552                         (FILE_DIRECTORY_INFO *)current_entry;
 553                 filename = &pFindData->FileName[0];
 554                 len = le32_to_cpu(pFindData->FileNameLength);
 555         } else if(cfile->srch_inf.info_level ==
 556                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 557                 FILE_FULL_DIRECTORY_INFO * pFindData =
 558                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 559                 filename = &pFindData->FileName[0];
 560                 len = le32_to_cpu(pFindData->FileNameLength);
 561         } else if(cfile->srch_inf.info_level ==
 562                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 563                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 564                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 565                 filename = &pFindData->FileName[0];
 566                 len = le32_to_cpu(pFindData->FileNameLength);
 567         } else if(cfile->srch_inf.info_level ==
 568                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 569                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 570                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 571                 filename = &pFindData->FileName[0];
 572                 len = le32_to_cpu(pFindData->FileNameLength);
 573         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 574                 FIND_FILE_STANDARD_INFO * pFindData =
 575                         (FIND_FILE_STANDARD_INFO *)current_entry;
 576                 filename = &pFindData->FileName[0];
 577                 len = pFindData->FileNameLength;
 578         } else {
 579                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 580         }
 581
 582         if(filename) {
 583                 if(cfile->srch_inf.unicode) {
 584                         __le16 *ufilename = (__le16 *)filename;
 585                         if(len == 2) {
 586                                 /* check for . */
 587                                 if(ufilename[0] == UNICODE_DOT)
 588                                         rc = 1;
 589                         } else if(len == 4) {
 590                                 /* check for .. */
 591                                 if((ufilename[0] == UNICODE_DOT)
 592                                    &&(ufilename[1] == UNICODE_DOT))
 593                                         rc = 2;
 594                         }
 595                 } else /* ASCII */ {
 596                         if(len == 1) {
 597                                 if(filename[0] == '.')
 598                                         rc = 1;
 599                         } else if(len == 2) {
 600                                 if((filename[0] == '.') && (filename[1] == '.'))
 601                                         rc = 2;
 602                         }
 603                 }
 604         }
 605
 606         return rc;
 607 }
 608
 609 /* Check if directory that we are searching has changed so we can decide
 610    whether we can use the cached search results from the previous search */
 611 static int is_dir_changed(struct file * file)
 612 {
 613         struct inode * inode;
 614         struct cifsInodeInfo *cifsInfo;
 615
 616         if(file->f_path.dentry == NULL)
 617                 return 0;
 618
 619         inode = file->f_path.dentry->d_inode;
 620
 621         if(inode == NULL)
 622                 return 0;
 623
 624         cifsInfo = CIFS_I(inode);
 625
 626         if(cifsInfo->time == 0)
 627                 return 1; /* directory was changed, perhaps due to unlink */
 628         else
 629                 return 0;
 630
 631 }
 632
 633 /* find the corresponding entry in the search */
 634 /* Note that the SMB server returns search entries for . and .. which
 635    complicates logic here if we choose to parse for them and we do not
 636    assume that they are located in the findfirst return buffer.*/
 637 /* We start counting in the buffer with entry 2 and increment for every
 638    entry (do not increment for . or .. entry) */
 639 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 640         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 641 {
 642         int rc = 0;
 643         int pos_in_buf = 0;
 644         loff_t first_entry_in_buffer;
 645         loff_t index_to_find = file->f_pos;
 646         struct cifsFileInfo * cifsFile = file->private_data;
 647         /* check if index in the buffer */
 648
 649         if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 650            (num_to_ret == NULL))
 651                 return -ENOENT;
 652
 653         *ppCurrentEntry = NULL;
 654         first_entry_in_buffer =
 655                 cifsFile->srch_inf.index_of_last_entry -
 656                         cifsFile->srch_inf.entries_in_buffer;
 657
 658         /* if first entry in buf is zero then is first buffer
 659         in search response data which means it is likely . and ..
 660         will be in this buffer, although some servers do not return
 661         . and .. for the root of a drive and for those we need
 662         to start two entries earlier */
 663
 664 #ifdef CONFIG_CIFS_DEBUG2
 665         dump_cifs_file_struct(file, "In fce ");
 666 #endif
 667         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 668              is_dir_changed(file)) ||
 669            (index_to_find < first_entry_in_buffer)) {
 670                 /* close and restart search */
 671                 cFYI(1,("search backing up - close and restart search"));
 672                 cifsFile->invalidHandle = TRUE;
 673                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 674                 kfree(cifsFile->search_resume_name);
 675                 cifsFile->search_resume_name = NULL;
 676                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 677                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 678                         if(cifsFile->srch_inf.smallBuf)
 679                                 cifs_small_buf_release(cifsFile->srch_inf.
 680                                                 ntwrk_buf_start);
 681                         else
 682                                 cifs_buf_release(cifsFile->srch_inf.
 683                                                 ntwrk_buf_start);
 684                 }
 685                 rc = initiate_cifs_search(xid,file);
 686                 if(rc) {
 687                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 688                         return rc;
 689                 }
 690         }
 691
 692         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 693               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 694                 cFYI(1,("calling findnext2"));
 695                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 696                                   &cifsFile->srch_inf);
 697                 if(rc)
 698                         return -ENOENT;
 699         }
 700         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 701                 /* we found the buffer that contains the entry */
 702                 /* scan and find it */
 703                 int i;
 704                 char * current_entry;
 705                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 706                         smbCalcSize((struct smb_hdr *)
 707                                 cifsFile->srch_inf.ntwrk_buf_start);
 708
 709                 current_entry = cifsFile->srch_inf.srch_entries_start;
 710                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 711                                         - cifsFile->srch_inf.entries_in_buffer;
 712                 pos_in_buf = index_to_find - first_entry_in_buffer;
 713                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 714
 715                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 716                         /* go entry by entry figuring out which is first */
 717                         current_entry = nxt_dir_entry(current_entry,end_of_smb,
 718                                                 cifsFile->srch_inf.info_level);
 719                 }
 720                 if((current_entry == NULL) && (i < pos_in_buf)) {
 721                         /* BB fixme - check if we should flag this error */
 722                         cERROR(1,("reached end of buf searching for pos in buf"
 723                           " %d index to find %lld rc %d",
 724                           pos_in_buf,index_to_find,rc));
 725                 }
 726                 rc = 0;
 727                 *ppCurrentEntry = current_entry;
 728         } else {
 729                 cFYI(1,("index not in buffer - could not findnext into it"));
 730                 return 0;
 731         }
 732
 733         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 734                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 735                 *num_to_ret = 0;
 736         } else
 737                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 738
 739         return rc;
 740 }
 741
 742 /* inode num, inode type and filename returned */
 743 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 744         char *current_entry, __u16 level, unsigned int unicode,
 745         struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
 746 {
 747         int rc = 0;
 748         unsigned int len = 0;
 749         char * filename;
 750         struct nls_table * nlt = cifs_sb->local_nls;
 751
 752         *pinum = 0;
 753
 754         if(level == SMB_FIND_FILE_UNIX) {
 755                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 756
 757                 filename = &pFindData->FileName[0];
 758                 if(unicode) {
 759                         len = cifs_unicode_bytelen(filename);
 760                 } else {
 761                         /* BB should we make this strnlen of PATH_MAX? */
 762                         len = strnlen(filename, PATH_MAX);
 763                 }
 764
 765                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 766                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 767                         *pinum = pFindData->UniqueId;
 768         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 769                 FILE_DIRECTORY_INFO * pFindData =
 770                         (FILE_DIRECTORY_INFO *)current_entry;
 771                 filename = &pFindData->FileName[0];
 772                 len = le32_to_cpu(pFindData->FileNameLength);
 773         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 774                 FILE_FULL_DIRECTORY_INFO * pFindData =
 775                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 776                 filename = &pFindData->FileName[0];
 777                 len = le32_to_cpu(pFindData->FileNameLength);
 778         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 779                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 780                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 781                 filename = &pFindData->FileName[0];
 782                 len = le32_to_cpu(pFindData->FileNameLength);
 783                 *pinum = pFindData->UniqueId;
 784         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 785                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 786                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 787                 filename = &pFindData->FileName[0];
 788                 len = le32_to_cpu(pFindData->FileNameLength);
 789         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 790                 FIND_FILE_STANDARD_INFO * pFindData =
 791                         (FIND_FILE_STANDARD_INFO *)current_entry;
 792                 filename = &pFindData->FileName[0];
 793                 /* one byte length, no name conversion */
 794                 len = (unsigned int)pFindData->FileNameLength;
 795         } else {
 796                 cFYI(1,("Unknown findfirst level %d",level));
 797                 return -EINVAL;
 798         }
 799
 800         if(len > max_len) {
 801                 cERROR(1,("bad search response length %d past smb end", len));
 802                 return -EINVAL;
 803         }
 804
 805         if(unicode) {
 806                 /* BB fixme - test with long names */
 807                 /* Note converted filename can be longer than in unicode */
 808                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 809                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 810                                         (__le16 *)filename, len/2, nlt);
 811                 else
 812                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 813                                         (__le16 *)filename,len/2,nlt);
 814         } else {
 815                 pqst->name = filename;
 816                 pqst->len = len;
 817         }
 818         pqst->hash = full_name_hash(pqst->name,pqst->len);
 819 /*      cFYI(1,("filldir on %s",pqst->name));  */
 820         return rc;
 821 }
 822
 823 static int cifs_filldir(char *pfindEntry, struct file *file,
 824         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 825 {
 826         int rc = 0;
 827         struct qstr qstring;
 828         struct cifsFileInfo * pCifsF;
 829         unsigned obj_type;
 830         ino_t  inum;
 831         struct cifs_sb_info * cifs_sb;
 832         struct inode *tmp_inode;
 833         struct dentry *tmp_dentry;
 834
 835         /* get filename and len into qstring */
 836         /* get dentry */
 837         /* decide whether to create and populate ionde */
 838         if((direntry == NULL) || (file == NULL))
 839                 return -EINVAL;
 840
 841         pCifsF = file->private_data;
 842
 843         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 844                 return -ENOENT;
 845
 846         if(file->f_path.dentry == NULL)
 847                 return -ENOENT;
 848
 849         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
 850         /* skip . and .. since we added them first */
 851         if(rc != 0)
 852                 return 0;
 853
 854         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 855
 856         qstring.name = scratch_buf;
 857         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 858                         pCifsF->srch_inf.info_level,
 859                         pCifsF->srch_inf.unicode,cifs_sb,
 860                         max_len,
 861                         &inum /* returned */);
 862
 863         if(rc)
 864                 return rc;
 865
 866         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 867         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 868                 return -ENOMEM;
 869
 870         if(rc) {
 871                 /* inode created, we need to hash it with right inode number */
 872                 if(inum != 0) {
 873                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 874                         tmp_inode->i_ino = inum;
 875                 }
 876                 insert_inode_hash(tmp_inode);
 877         }
 878
 879         /* we pass in rc below, indicating whether it is a new inode,
 880            so we can figure out whether to invalidate the inode cached
 881            data if the file has changed */
 882         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 883                 unix_fill_in_inode(tmp_inode,
 884                                    (FILE_UNIX_INFO *)pfindEntry,
 885                                    &obj_type, rc);
 886         else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 887                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 888                                 pfindEntry, &obj_type, rc);
 889         else
 890                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 891
 892         if(rc) /* new inode - needs to be tied to dentry */ {
 893                 d_instantiate(tmp_dentry, tmp_inode);
 894                 if(rc == 2)
 895                         d_rehash(tmp_dentry);
 896         }
 897
 898
 899         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 900                      tmp_inode->i_ino,obj_type);
 901         if(rc) {
 902                 cFYI(1,("filldir rc = %d",rc));
 903                 /* we can not return filldir errors to the caller
 904                 since they are "normal" when the stat blocksize
 905                 is too small - we return remapped error instead */
 906                 rc = -EOVERFLOW;
 907         }
 908
 909         dput(tmp_dentry);
 910         return rc;
 911 }
 912
 913 static int cifs_save_resume_key(const char *current_entry,
 914         struct cifsFileInfo *cifsFile)
 915 {
 916         int rc = 0;
 917         unsigned int len = 0;
 918         __u16 level;
 919         char * filename;
 920
 921         if((cifsFile == NULL) || (current_entry == NULL))
 922                 return -EINVAL;
 923
 924         level = cifsFile->srch_inf.info_level;
 925
 926         if(level == SMB_FIND_FILE_UNIX) {
 927                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 928
 929                 filename = &pFindData->FileName[0];
 930                 if(cifsFile->srch_inf.unicode) {
 931                         len = cifs_unicode_bytelen(filename);
 932                 } else {
 933                         /* BB should we make this strnlen of PATH_MAX? */
 934                         len = strnlen(filename, PATH_MAX);
 935                 }
 936                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 937         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 938                 FILE_DIRECTORY_INFO * pFindData =
 939                         (FILE_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_FULL_DIRECTORY_INFO) {
 944                 FILE_FULL_DIRECTORY_INFO * pFindData =
 945                         (FILE_FULL_DIRECTORY_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_ID_FULL_DIR_INFO) {
 950                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 951                         (SEARCH_ID_FULL_DIR_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_BOTH_DIRECTORY_INFO) {
 956                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 957                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 958                 filename = &pFindData->FileName[0];
 959                 len = le32_to_cpu(pFindData->FileNameLength);
 960                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 961         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
 962                 FIND_FILE_STANDARD_INFO * pFindData =
 963                         (FIND_FILE_STANDARD_INFO *)current_entry;
 964                 filename = &pFindData->FileName[0];
 965                 /* one byte length, no name conversion */
 966                 len = (unsigned int)pFindData->FileNameLength;
 967                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 968         } else {
 969                 cFYI(1,("Unknown findfirst level %d",level));
 970                 return -EINVAL;
 971         }
 972         cifsFile->srch_inf.resume_name_len = len;
 973         cifsFile->srch_inf.presume_name = filename;
 974         return rc;
 975 }
 976
 977 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 978 {
 979         int rc = 0;
 980         int xid,i;
 981         struct cifs_sb_info *cifs_sb;
 982         struct cifsTconInfo *pTcon;
 983         struct cifsFileInfo *cifsFile = NULL;
 984         char * current_entry;
 985         int num_to_fill = 0;
 986         char * tmp_buf = NULL;
 987         char * end_of_smb;
 988         int max_len;
 989
 990         xid = GetXid();
 991
 992         if(file->f_path.dentry == NULL) {
 993                 FreeXid(xid);
 994                 return -EIO;
 995         }
 996
 997         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 998         pTcon = cifs_sb->tcon;
 999         if(pTcon == NULL)
1000                 return -EINVAL;
1001
1002         switch ((int) file->f_pos) {
1003         case 0:
1004                 if (filldir(direntry, ".", 1, file->f_pos,
1005                      file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1006                         cERROR(1, ("Filldir for current dir failed"));
1007                         rc = -ENOMEM;
1008                         break;
1009                 }
1010                 file->f_pos++;
1011         case 1:
1012                 if (filldir(direntry, "..", 2, file->f_pos,
1013                      file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1014                         cERROR(1, ("Filldir for parent dir failed"));
1015                         rc = -ENOMEM;
1016                         break;
1017                 }
1018                 file->f_pos++;
1019         default:
1020                 /* 1) If search is active,
1021                         is in current search buffer?
1022                         if it before then restart search
1023                         if after then keep searching till find it */
1024
1025                 if(file->private_data == NULL) {
1026                         rc = initiate_cifs_search(xid,file);
1027                         cFYI(1,("initiate cifs search rc %d",rc));
1028                         if(rc) {
1029                                 FreeXid(xid);
1030                                 return rc;
1031                         }
1032                 }
1033                 if(file->private_data == NULL) {
1034                         rc = -EINVAL;
1035                         FreeXid(xid);
1036                         return rc;
1037                 }
1038                 cifsFile = file->private_data;
1039                 if (cifsFile->srch_inf.endOfSearch) {
1040                         if(cifsFile->srch_inf.emptyDir) {
1041                                 cFYI(1, ("End of search, empty dir"));
1042                                 rc = 0;
1043                                 break;
1044                         }
1045                 } /* else {
1046                         cifsFile->invalidHandle = TRUE;
1047                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1048                 }
1049                 kfree(cifsFile->search_resume_name);
1050                 cifsFile->search_resume_name = NULL; */
1051
1052                 rc = find_cifs_entry(xid,pTcon, file,
1053                                 &current_entry,&num_to_fill);
1054                 if(rc) {
1055                         cFYI(1,("fce error %d",rc));
1056                         goto rddir2_exit;
1057                 } else if (current_entry != NULL) {
1058                         cFYI(1,("entry %lld found",file->f_pos));
1059                 } else {
1060                         cFYI(1,("could not find entry"));
1061                         goto rddir2_exit;
1062                 }
1063                 cFYI(1,("loop through %d times filling dir for net buf %p",
1064                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1065                 max_len = smbCalcSize((struct smb_hdr *)
1066                                 cifsFile->srch_inf.ntwrk_buf_start);
1067                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1068
1069                 /* To be safe - for UCS to UTF-8 with strings loaded
1070                 with the rare long characters alloc more to account for
1071                 such multibyte target UTF-8 characters. cifs_unicode.c,
1072                 which actually does the conversion, has the same limit */
1073                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1074                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1075                         if(current_entry == NULL) {
1076                                 /* evaluate whether this case is an error */
1077                                 cERROR(1,("past end of SMB num to fill %d i %d",
1078                                           num_to_fill, i));
1079                                 break;
1080                         }
1081                         /* if buggy server returns . and .. late do
1082                         we want to check for that here? */
1083                         rc = cifs_filldir(current_entry, file,
1084                                         filldir, direntry, tmp_buf, max_len);
1085                         if(rc == -EOVERFLOW) {
1086                                 rc = 0;
1087                                 break;
1088                         }
1089
1090                         file->f_pos++;
1091                         if(file->f_pos ==
1092                                 cifsFile->srch_inf.index_of_last_entry) {
1093                                 cFYI(1,("last entry in buf at pos %lld %s",
1094                                         file->f_pos,tmp_buf));
1095                                 cifs_save_resume_key(current_entry,cifsFile);
1096                                 break;
1097                         } else
1098                                 current_entry =
1099                                         nxt_dir_entry(current_entry, end_of_smb,
1100                                                 cifsFile->srch_inf.info_level);
1101                 }
1102                 kfree(tmp_buf);
1103                 break;
1104         } /* end switch */
1105
1106 rddir2_exit:
1107         FreeXid(xid);
1108         return rc;
1109 }