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