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

   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004, 2007
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <linux/fs.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/stat.h>
  26 #include "cifspdu.h"
  27 #include "cifsglob.h"
  28 #include "cifsproto.h"
  29 #include "cifs_unicode.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_fs_sb.h"
  32 #include "cifsfs.h"
  33
  34 #ifdef CONFIG_CIFS_DEBUG2
  35 static void dump_cifs_file_struct(struct file *file, char *label)
  36 {
  37         struct cifsFileInfo *cf;
  38
  39         if (file) {
  40                 cf = file->private_data;
  41                 if (cf == NULL) {
  42                         cFYI(1, ("empty cifs private file data"));
  43                         return;
  44                 }
  45                 if (cf->invalidHandle) {
  46                         cFYI(1, ("invalid handle"));
  47                 }
  48                 if (cf->srch_inf.endOfSearch) {
  49                         cFYI(1, ("end of search"));
  50                 }
  51                 if (cf->srch_inf.emptyDir) {
  52                         cFYI(1, ("empty dir"));
  53                 }
  54         }
  55 }
  56 #endif /* DEBUG2 */
  57
  58 /* Returns one if new inode created (which therefore needs to be hashed) */
  59 /* Might check in the future if inode number changed so we can rehash inode */
  60 static int construct_dentry(struct qstr *qstring, struct file *file,
  61         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  62 {
  63         struct dentry *tmp_dentry;
  64         struct cifs_sb_info *cifs_sb;
  65         struct cifsTconInfo *pTcon;
  66         int rc = 0;
  67
  68         cFYI(1, ("For %s", qstring->name));
  69         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
  70         pTcon = cifs_sb->tcon;
  71
  72         qstring->hash = full_name_hash(qstring->name, qstring->len);
  73         tmp_dentry = d_lookup(file->f_path.dentry, qstring);
  74         if (tmp_dentry) {
  75                 cFYI(0, ("existing dentry with inode 0x%p",
  76                          tmp_dentry->d_inode));
  77                 *ptmp_inode = tmp_dentry->d_inode;
  78 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
  79                 if (*ptmp_inode == NULL) {
  80                         *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
  81                         if (*ptmp_inode == NULL)
  82                                 return rc;
  83                         rc = 1;
  84                 }
  85                 if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
  86                         (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
  87         } else {
  88                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
  89                 if (tmp_dentry == NULL) {
  90                         cERROR(1, ("Failed allocating dentry"));
  91                         *ptmp_inode = NULL;
  92                         return rc;
  93                 }
  94
  95                 *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
  96                 if (pTcon->nocase)
  97                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
  98                 else
  99                         tmp_dentry->d_op = &cifs_dentry_ops;
 100                 if (*ptmp_inode == NULL)
 101                         return rc;
 102                 if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
 103                         (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
 104                 rc = 2;
 105         }
 106
 107         tmp_dentry->d_time = jiffies;
 108         *pnew_dentry = tmp_dentry;
 109         return rc;
 110 }
 111
 112 static void AdjustForTZ(struct cifsTconInfo *tcon, struct inode *inode)
 113 {
 114         if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
 115                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
 116                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
 117                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
 118         }
 119         return;
 120 }
 121
 122
 123 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
 124                           char *buf, int *pobject_type, int isNewInode)
 125 {
 126         loff_t local_size;
 127         struct timespec local_mtime;
 128
 129         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 130         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 131         __u32 attr;
 132         __u64 allocation_size;
 133         __u64 end_of_file;
 134
 135         /* save mtime and size */
 136         local_mtime = tmp_inode->i_mtime;
 137         local_size  = tmp_inode->i_size;
 138
 139         if (new_buf_type) {
 140                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
 141
 142                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 143                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 144                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 145                 tmp_inode->i_atime =
 146                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 147                 tmp_inode->i_mtime =
 148                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 149                 tmp_inode->i_ctime =
 150                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 151         } else { /* legacy, OS2 and DOS style */
 152 /*              struct timespec ts;*/
 153                 FIND_FILE_STANDARD_INFO * pfindData =
 154                         (FIND_FILE_STANDARD_INFO *)buf;
 155
 156                 tmp_inode->i_mtime = cnvrtDosUnixTm(
 157                                 le16_to_cpu(pfindData->LastWriteDate),
 158                                 le16_to_cpu(pfindData->LastWriteTime));
 159                 tmp_inode->i_atime = cnvrtDosUnixTm(
 160                                 le16_to_cpu(pfindData->LastAccessDate),
 161                                 le16_to_cpu(pfindData->LastAccessTime));
 162                 tmp_inode->i_ctime = cnvrtDosUnixTm(
 163                                 le16_to_cpu(pfindData->LastWriteDate),
 164                                 le16_to_cpu(pfindData->LastWriteTime));
 165                 AdjustForTZ(cifs_sb->tcon, tmp_inode);
 166                 attr = le16_to_cpu(pfindData->Attributes);
 167                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
 168                 end_of_file = le32_to_cpu(pfindData->DataSize);
 169         }
 170
 171         /* Linux can not store file creation time unfortunately so ignore it */
 172
 173         cifsInfo->cifsAttrs = attr;
 174         cifsInfo->time = jiffies;
 175
 176         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 177         /* 2767 perms - indicate mandatory locking */
 178                 /* BB fill in uid and gid here? with help from winbind?
 179                    or retrieve from NTFS stream extended attribute */
 180         if (atomic_read(&cifsInfo->inUse) == 0) {
 181                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 182                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 183                 /* set default mode. will override for dirs below */
 184                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 185         } else {
 186                 /* mask off the type bits since it gets set
 187                 below and we do not want to get two type
 188                 bits set */
 189                 tmp_inode->i_mode &= ~S_IFMT;
 190         }
 191
 192         if (attr & ATTR_DIRECTORY) {
 193                 *pobject_type = DT_DIR;
 194                 /* override default perms since we do not lock dirs */
 195                 if (atomic_read(&cifsInfo->inUse) == 0) {
 196                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 197                 }
 198                 tmp_inode->i_mode |= S_IFDIR;
 199         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 200                    (attr & ATTR_SYSTEM)) {
 201                 if (end_of_file == 0)  {
 202                         *pobject_type = DT_FIFO;
 203                         tmp_inode->i_mode |= S_IFIFO;
 204                 } else {
 205                         /* rather than get the type here, we mark the
 206                         inode as needing revalidate and get the real type
 207                         (blk vs chr vs. symlink) later ie in lookup */
 208                         *pobject_type = DT_REG;
 209                         tmp_inode->i_mode |= S_IFREG;
 210                         cifsInfo->time = 0;
 211                 }
 212 /* we no longer mark these because we could not follow them */
 213 /*        } else if (attr & ATTR_REPARSE) {
 214                 *pobject_type = DT_LNK;
 215                 tmp_inode->i_mode |= S_IFLNK; */
 216         } else {
 217                 *pobject_type = DT_REG;
 218                 tmp_inode->i_mode |= S_IFREG;
 219                 if (attr & ATTR_READONLY)
 220                         tmp_inode->i_mode &= ~(S_IWUGO);
 221                 else if ((tmp_inode->i_mode & S_IWUGO) == 0)
 222                         /* the ATTR_READONLY flag may have been changed on   */
 223                         /* server -- set any w bits allowed by mnt_file_mode */
 224                         tmp_inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
 225         } /* could add code here - to validate if device or weird share type? */
 226
 227         /* can not fill in nlink here as in qpathinfo version and Unx search */
 228         if (atomic_read(&cifsInfo->inUse) == 0) {
 229                 atomic_set(&cifsInfo->inUse, 1);
 230         }
 231
 232         spin_lock(&tmp_inode->i_lock);
 233         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 234                 /* can not safely change the file size here if the
 235                 client is writing to it due to potential races */
 236                 i_size_write(tmp_inode, end_of_file);
 237
 238         /* 512 bytes (2**9) is the fake blocksize that must be used */
 239         /* for this calculation, even though the reported blocksize is larger */
 240                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 241         }
 242         spin_unlock(&tmp_inode->i_lock);
 243
 244         if (allocation_size < end_of_file)
 245                 cFYI(1, ("May be sparse file, allocation less than file size"));
 246         cFYI(1, ("File Size %ld and blocks %llu",
 247                 (unsigned long)tmp_inode->i_size,
 248                 (unsigned long long)tmp_inode->i_blocks));
 249         if (S_ISREG(tmp_inode->i_mode)) {
 250                 cFYI(1, ("File inode"));
 251                 tmp_inode->i_op = &cifs_file_inode_ops;
 252                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 253                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 254                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 255                         else
 256                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 257                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 258                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 259                 else
 260                         tmp_inode->i_fop = &cifs_file_ops;
 261
 262                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 263                    (cifs_sb->tcon->ses->server->maxBuf <
 264                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 265                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 266                 else
 267                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 268
 269                 if (isNewInode)
 270                         return; /* No sense invalidating pages for new inode
 271                                    since have not started caching readahead file
 272                                    data yet */
 273
 274                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 275                         (local_size == tmp_inode->i_size)) {
 276                         cFYI(1, ("inode exists but unchanged"));
 277                 } else {
 278                         /* file may have changed on server */
 279                         cFYI(1, ("invalidate inode, readdir detected change"));
 280                         invalidate_remote_inode(tmp_inode);
 281                 }
 282         } else if (S_ISDIR(tmp_inode->i_mode)) {
 283                 cFYI(1, ("Directory inode"));
 284                 tmp_inode->i_op = &cifs_dir_inode_ops;
 285                 tmp_inode->i_fop = &cifs_dir_ops;
 286         } else if (S_ISLNK(tmp_inode->i_mode)) {
 287                 cFYI(1, ("Symbolic Link inode"));
 288                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 289         } else {
 290                 cFYI(1, ("Init special inode"));
 291                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 292                                    tmp_inode->i_rdev);
 293         }
 294 }
 295
 296 static void unix_fill_in_inode(struct inode *tmp_inode,
 297         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 298 {
 299         loff_t local_size;
 300         struct timespec local_mtime;
 301
 302         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 303         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 304
 305         __u32 type = le32_to_cpu(pfindData->Type);
 306         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 307         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 308         cifsInfo->time = jiffies;
 309         atomic_inc(&cifsInfo->inUse);
 310
 311         /* save mtime and size */
 312         local_mtime = tmp_inode->i_mtime;
 313         local_size  = tmp_inode->i_size;
 314
 315         tmp_inode->i_atime =
 316             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 317         tmp_inode->i_mtime =
 318             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 319         tmp_inode->i_ctime =
 320             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 321
 322         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 323         /* since we set the inode type below we need to mask off type
 324            to avoid strange results if bits above were corrupt */
 325         tmp_inode->i_mode &= ~S_IFMT;
 326         if (type == UNIX_FILE) {
 327                 *pobject_type = DT_REG;
 328                 tmp_inode->i_mode |= S_IFREG;
 329         } else if (type == UNIX_SYMLINK) {
 330                 *pobject_type = DT_LNK;
 331                 tmp_inode->i_mode |= S_IFLNK;
 332         } else if (type == UNIX_DIR) {
 333                 *pobject_type = DT_DIR;
 334                 tmp_inode->i_mode |= S_IFDIR;
 335         } else if (type == UNIX_CHARDEV) {
 336                 *pobject_type = DT_CHR;
 337                 tmp_inode->i_mode |= S_IFCHR;
 338                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 339                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 340         } else if (type == UNIX_BLOCKDEV) {
 341                 *pobject_type = DT_BLK;
 342                 tmp_inode->i_mode |= S_IFBLK;
 343                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 344                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 345         } else if (type == UNIX_FIFO) {
 346                 *pobject_type = DT_FIFO;
 347                 tmp_inode->i_mode |= S_IFIFO;
 348         } else if (type == UNIX_SOCKET) {
 349                 *pobject_type = DT_SOCK;
 350                 tmp_inode->i_mode |= S_IFSOCK;
 351         } else {
 352                 /* safest to just call it a file */
 353                 *pobject_type = DT_REG;
 354                 tmp_inode->i_mode |= S_IFREG;
 355                 cFYI(1, ("unknown inode type %d", type));
 356         }
 357
 358         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 359                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 360         else
 361                 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 362         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 363                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 364         else
 365                 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 366         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 367
 368         spin_lock(&tmp_inode->i_lock);
 369         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 370                 /* can not safely change the file size here if the
 371                 client is writing to it due to potential races */
 372                 i_size_write(tmp_inode, end_of_file);
 373
 374         /* 512 bytes (2**9) is the fake blocksize that must be used */
 375         /* for this calculation, not the real blocksize */
 376                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 377         }
 378         spin_unlock(&tmp_inode->i_lock);
 379
 380         if (S_ISREG(tmp_inode->i_mode)) {
 381                 cFYI(1, ("File inode"));
 382                 tmp_inode->i_op = &cifs_file_inode_ops;
 383
 384                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 385                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 386                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 387                         else
 388                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 389                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 390                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 391                 else
 392                         tmp_inode->i_fop = &cifs_file_ops;
 393
 394                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 395                    (cifs_sb->tcon->ses->server->maxBuf <
 396                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 397                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 398                 else
 399                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 400
 401                 if (isNewInode)
 402                         return; /* No sense invalidating pages for new inode
 403                                    since we have not started caching readahead
 404                                    file data for it yet */
 405
 406                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 407                         (local_size == tmp_inode->i_size)) {
 408                         cFYI(1, ("inode exists but unchanged"));
 409                 } else {
 410                         /* file may have changed on server */
 411                         cFYI(1, ("invalidate inode, readdir detected change"));
 412                         invalidate_remote_inode(tmp_inode);
 413                 }
 414         } else if (S_ISDIR(tmp_inode->i_mode)) {
 415                 cFYI(1, ("Directory inode"));
 416                 tmp_inode->i_op = &cifs_dir_inode_ops;
 417                 tmp_inode->i_fop = &cifs_dir_ops;
 418         } else if (S_ISLNK(tmp_inode->i_mode)) {
 419                 cFYI(1, ("Symbolic Link inode"));
 420                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 421 /* tmp_inode->i_fop = *//* do not need to set to anything */
 422         } else {
 423                 cFYI(1, ("Special inode"));
 424                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 425                                    tmp_inode->i_rdev);
 426         }
 427 }
 428
 429 static int initiate_cifs_search(const int xid, struct file *file)
 430 {
 431         int rc = 0;
 432         char *full_path;
 433         struct cifsFileInfo *cifsFile;
 434         struct cifs_sb_info *cifs_sb;
 435         struct cifsTconInfo *pTcon;
 436
 437         if (file->private_data == NULL) {
 438                 file->private_data =
 439                         kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
 440         }
 441
 442         if (file->private_data == NULL)
 443                 return -ENOMEM;
 444         cifsFile = file->private_data;
 445         cifsFile->invalidHandle = TRUE;
 446         cifsFile->srch_inf.endOfSearch = FALSE;
 447
 448         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 449         if (cifs_sb == NULL)
 450                 return -EINVAL;
 451
 452         pTcon = cifs_sb->tcon;
 453         if (pTcon == NULL)
 454                 return -EINVAL;
 455
 456         full_path = build_path_from_dentry(file->f_path.dentry);
 457
 458         if (full_path == NULL) {
 459                 return -ENOMEM;
 460         }
 461
 462         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 463
 464 ffirst_retry:
 465         /* test for Unix extensions */
 466         if (pTcon->ses->capabilities & CAP_UNIX) {
 467                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 468         } else if ((pTcon->ses->capabilities &
 469                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 470                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 471         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 472                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 473         } else /* not srvinos - BB fixme add check for backlevel? */ {
 474                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 475         }
 476
 477         rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
 478                 &cifsFile->netfid, &cifsFile->srch_inf,
 479                 cifs_sb->mnt_cifs_flags &
 480                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 481         if (rc == 0)
 482                 cifsFile->invalidHandle = FALSE;
 483         if ((rc == -EOPNOTSUPP) &&
 484                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 485                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 486                 goto ffirst_retry;
 487         }
 488         kfree(full_path);
 489         return rc;
 490 }
 491
 492 /* return length of unicode string in bytes */
 493 static int cifs_unicode_bytelen(char *str)
 494 {
 495         int len;
 496         __le16 * ustr = (__le16 *)str;
 497
 498         for (len = 0; len <= PATH_MAX; len++) {
 499                 if (ustr[len] == 0)
 500                         return len << 1;
 501         }
 502         cFYI(1, ("Unicode string longer than PATH_MAX found"));
 503         return len << 1;
 504 }
 505
 506 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 507 {
 508         char *new_entry;
 509         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 510
 511         if (level == SMB_FIND_FILE_INFO_STANDARD) {
 512                 FIND_FILE_STANDARD_INFO * pfData;
 513                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 514
 515                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 516                                 pfData->FileNameLength;
 517         } else
 518                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 519         cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
 520         /* validate that new_entry is not past end of SMB */
 521         if (new_entry >= end_of_smb) {
 522                 cERROR(1,
 523                       ("search entry %p began after end of SMB %p old entry %p",
 524                         new_entry, end_of_smb, old_entry));
 525                 return NULL;
 526         } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
 527                     (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
 528                   || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 529                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 530                 cERROR(1, ("search entry %p extends after end of SMB %p",
 531                         new_entry, end_of_smb));
 532                 return NULL;
 533         } else
 534                 return new_entry;
 535
 536 }
 537
 538 #define UNICODE_DOT cpu_to_le16(0x2e)
 539
 540 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 541 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 542 {
 543         int rc = 0;
 544         char *filename = NULL;
 545         int len = 0;
 546
 547         if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 548                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 549                 filename = &pFindData->FileName[0];
 550                 if (cfile->srch_inf.unicode) {
 551                         len = cifs_unicode_bytelen(filename);
 552                 } else {
 553                         /* BB should we make this strnlen of PATH_MAX? */
 554                         len = strnlen(filename, 5);
 555                 }
 556         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 557                 FILE_DIRECTORY_INFO * pFindData =
 558                         (FILE_DIRECTORY_INFO *)current_entry;
 559                 filename = &pFindData->FileName[0];
 560                 len = le32_to_cpu(pFindData->FileNameLength);
 561         } else if (cfile->srch_inf.info_level ==
 562                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 563                 FILE_FULL_DIRECTORY_INFO * pFindData =
 564                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 565                 filename = &pFindData->FileName[0];
 566                 len = le32_to_cpu(pFindData->FileNameLength);
 567         } else if (cfile->srch_inf.info_level ==
 568                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 569                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 570                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 571                 filename = &pFindData->FileName[0];
 572                 len = le32_to_cpu(pFindData->FileNameLength);
 573         } else if (cfile->srch_inf.info_level ==
 574                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 575                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 576                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 577                 filename = &pFindData->FileName[0];
 578                 len = le32_to_cpu(pFindData->FileNameLength);
 579         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 580                 FIND_FILE_STANDARD_INFO * pFindData =
 581                         (FIND_FILE_STANDARD_INFO *)current_entry;
 582                 filename = &pFindData->FileName[0];
 583                 len = pFindData->FileNameLength;
 584         } else {
 585                 cFYI(1, ("Unknown findfirst level %d",
 586                          cfile->srch_inf.info_level));
 587         }
 588
 589         if (filename) {
 590                 if (cfile->srch_inf.unicode) {
 591                         __le16 *ufilename = (__le16 *)filename;
 592                         if (len == 2) {
 593                                 /* check for . */
 594                                 if (ufilename[0] == UNICODE_DOT)
 595                                         rc = 1;
 596                         } else if (len == 4) {
 597                                 /* check for .. */
 598                                 if ((ufilename[0] == UNICODE_DOT)
 599                                    && (ufilename[1] == UNICODE_DOT))
 600                                         rc = 2;
 601                         }
 602                 } else /* ASCII */ {
 603                         if (len == 1) {
 604                                 if (filename[0] == '.')
 605                                         rc = 1;
 606                         } else if (len == 2) {
 607                                 if ((filename[0] == '.') && (filename[1] == '.'))
 608                                         rc = 2;
 609                         }
 610                 }
 611         }
 612
 613         return rc;
 614 }
 615
 616 /* Check if directory that we are searching has changed so we can decide
 617    whether we can use the cached search results from the previous search */
 618 static int is_dir_changed(struct file *file)
 619 {
 620         struct inode *inode = file->f_path.dentry->d_inode;
 621         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
 622
 623         if (cifsInfo->time == 0)
 624                 return 1; /* directory was changed, perhaps due to unlink */
 625         else
 626                 return 0;
 627
 628 }
 629
 630 /* find the corresponding entry in the search */
 631 /* Note that the SMB server returns search entries for . and .. which
 632    complicates logic here if we choose to parse for them and we do not
 633    assume that they are located in the findfirst return buffer.*/
 634 /* We start counting in the buffer with entry 2 and increment for every
 635    entry (do not increment for . or .. entry) */
 636 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 637         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 638 {
 639         int rc = 0;
 640         int pos_in_buf = 0;
 641         loff_t first_entry_in_buffer;
 642         loff_t index_to_find = file->f_pos;
 643         struct cifsFileInfo *cifsFile = file->private_data;
 644         /* check if index in the buffer */
 645
 646         if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 647            (num_to_ret == NULL))
 648                 return -ENOENT;
 649
 650         *ppCurrentEntry = NULL;
 651         first_entry_in_buffer =
 652                 cifsFile->srch_inf.index_of_last_entry -
 653                         cifsFile->srch_inf.entries_in_buffer;
 654
 655         /* if first entry in buf is zero then is first buffer
 656         in search response data which means it is likely . and ..
 657         will be in this buffer, although some servers do not return
 658         . and .. for the root of a drive and for those we need
 659         to start two entries earlier */
 660
 661 #ifdef CONFIG_CIFS_DEBUG2
 662         dump_cifs_file_struct(file, "In fce ");
 663 #endif
 664         if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 665              is_dir_changed(file)) ||
 666            (index_to_find < first_entry_in_buffer)) {
 667                 /* close and restart search */
 668                 cFYI(1, ("search backing up - close and restart search"));
 669                 cifsFile->invalidHandle = TRUE;
 670                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 671                 kfree(cifsFile->search_resume_name);
 672                 cifsFile->search_resume_name = NULL;
 673                 if (cifsFile->srch_inf.ntwrk_buf_start) {
 674                         cFYI(1, ("freeing SMB ff cache buf on search rewind"));
 675                         if (cifsFile->srch_inf.smallBuf)
 676                                 cifs_small_buf_release(cifsFile->srch_inf.
 677                                                 ntwrk_buf_start);
 678                         else
 679                                 cifs_buf_release(cifsFile->srch_inf.
 680                                                 ntwrk_buf_start);
 681                 }
 682                 rc = initiate_cifs_search(xid, file);
 683                 if (rc) {
 684                         cFYI(1, ("error %d reinitiating a search on rewind",
 685                                  rc));
 686                         return rc;
 687                 }
 688         }
 689
 690         while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 691               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)) {
 692                 cFYI(1, ("calling findnext2"));
 693                 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
 694                                   &cifsFile->srch_inf);
 695                 if (rc)
 696                         return -ENOENT;
 697         }
 698         if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 699                 /* we found the buffer that contains the entry */
 700                 /* scan and find it */
 701                 int i;
 702                 char *current_entry;
 703                 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 704                         smbCalcSize((struct smb_hdr *)
 705                                 cifsFile->srch_inf.ntwrk_buf_start);
 706
 707                 current_entry = cifsFile->srch_inf.srch_entries_start;
 708                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 709                                         - cifsFile->srch_inf.entries_in_buffer;
 710                 pos_in_buf = index_to_find - first_entry_in_buffer;
 711                 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
 712
 713                 for (i=0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
 714                         /* go entry by entry figuring out which is first */
 715                         current_entry = nxt_dir_entry(current_entry, end_of_smb,
 716                                                 cifsFile->srch_inf.info_level);
 717                 }
 718                 if ((current_entry == NULL) && (i < pos_in_buf)) {
 719                         /* BB fixme - check if we should flag this error */
 720                         cERROR(1, ("reached end of buf searching for pos in buf"
 721                           " %d index to find %lld rc %d",
 722                           pos_in_buf, index_to_find, rc));
 723                 }
 724                 rc = 0;
 725                 *ppCurrentEntry = current_entry;
 726         } else {
 727                 cFYI(1, ("index not in buffer - could not findnext into it"));
 728                 return 0;
 729         }
 730
 731         if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 732                 cFYI(1, ("can not return entries pos_in_buf beyond last"));
 733                 *num_to_ret = 0;
 734         } else
 735                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 736
 737         return rc;
 738 }
 739
 740 /* inode num, inode type and filename returned */
 741 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 742         char *current_entry, __u16 level, unsigned int unicode,
 743         struct cifs_sb_info *cifs_sb, int max_len, ino_t *pinum)
 744 {
 745         int rc = 0;
 746         unsigned int len = 0;
 747         char *filename;
 748         struct nls_table *nlt = cifs_sb->local_nls;
 749
 750         *pinum = 0;
 751
 752         if (level == SMB_FIND_FILE_UNIX) {
 753                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
 754
 755                 filename = &pFindData->FileName[0];
 756                 if (unicode) {
 757                         len = cifs_unicode_bytelen(filename);
 758                 } else {
 759                         /* BB should we make this strnlen of PATH_MAX? */
 760                         len = strnlen(filename, PATH_MAX);
 761                 }
 762
 763                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
 764                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 765                         *pinum = pFindData->UniqueId;
 766         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
 767                 FILE_DIRECTORY_INFO *pFindData =
 768                         (FILE_DIRECTORY_INFO *)current_entry;
 769                 filename = &pFindData->FileName[0];
 770                 len = le32_to_cpu(pFindData->FileNameLength);
 771         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 772                 FILE_FULL_DIRECTORY_INFO *pFindData =
 773                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 774                 filename = &pFindData->FileName[0];
 775                 len = le32_to_cpu(pFindData->FileNameLength);
 776         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 777                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 778                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 779                 filename = &pFindData->FileName[0];
 780                 len = le32_to_cpu(pFindData->FileNameLength);
 781                 *pinum = pFindData->UniqueId;
 782         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 783                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 784                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 785                 filename = &pFindData->FileName[0];
 786                 len = le32_to_cpu(pFindData->FileNameLength);
 787         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
 788                 FIND_FILE_STANDARD_INFO * pFindData =
 789                         (FIND_FILE_STANDARD_INFO *)current_entry;
 790                 filename = &pFindData->FileName[0];
 791                 /* one byte length, no name conversion */
 792                 len = (unsigned int)pFindData->FileNameLength;
 793         } else {
 794                 cFYI(1, ("Unknown findfirst level %d", level));
 795                 return -EINVAL;
 796         }
 797
 798         if (len > max_len) {
 799                 cERROR(1, ("bad search response length %d past smb end", len));
 800                 return -EINVAL;
 801         }
 802
 803         if (unicode) {
 804                 /* BB fixme - test with long names */
 805                 /* Note converted filename can be longer than in unicode */
 806                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 807                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 808                                         (__le16 *)filename, len/2, nlt);
 809                 else
 810                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 811                                         (__le16 *)filename, len/2, nlt);
 812         } else {
 813                 pqst->name = filename;
 814                 pqst->len = len;
 815         }
 816         pqst->hash = full_name_hash(pqst->name, pqst->len);
 817 /*      cFYI(1, ("filldir on %s",pqst->name));  */
 818         return rc;
 819 }
 820
 821 static int cifs_filldir(char *pfindEntry, struct file *file,
 822         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 823 {
 824         int rc = 0;
 825         struct qstr qstring;
 826         struct cifsFileInfo *pCifsF;
 827         unsigned obj_type;
 828         ino_t  inum;
 829         struct cifs_sb_info *cifs_sb;
 830         struct inode *tmp_inode;
 831         struct dentry *tmp_dentry;
 832
 833         /* get filename and len into qstring */
 834         /* get dentry */
 835         /* decide whether to create and populate ionde */
 836         if ((direntry == NULL) || (file == NULL))
 837                 return -EINVAL;
 838
 839         pCifsF = file->private_data;
 840
 841         if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 842                 return -ENOENT;
 843
 844         rc = cifs_entry_is_dot(pfindEntry, pCifsF);
 845         /* skip . and .. since we added them first */
 846         if (rc != 0)
 847                 return 0;
 848
 849         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 850
 851         qstring.name = scratch_buf;
 852         rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
 853                         pCifsF->srch_inf.info_level,
 854                         pCifsF->srch_inf.unicode, cifs_sb,
 855                         max_len,
 856                         &inum /* returned */);
 857
 858         if (rc)
 859                 return rc;
 860
 861         rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry);
 862         if ((tmp_inode == NULL) || (tmp_dentry == NULL))
 863                 return -ENOMEM;
 864
 865         if (rc) {
 866                 /* inode created, we need to hash it with right inode number */
 867                 if (inum != 0) {
 868                         /* BB fixme - hash the 2 32 quantities bits together if
 869                          *  necessary BB */
 870                         tmp_inode->i_ino = inum;
 871                 }
 872                 insert_inode_hash(tmp_inode);
 873         }
 874
 875         /* we pass in rc below, indicating whether it is a new inode,
 876            so we can figure out whether to invalidate the inode cached
 877            data if the file has changed */
 878         if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 879                 unix_fill_in_inode(tmp_inode,
 880                                    (FILE_UNIX_INFO *)pfindEntry,
 881                                    &obj_type, rc);
 882         else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 883                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 884                                 pfindEntry, &obj_type, rc);
 885         else
 886                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 887
 888         if (rc) /* new inode - needs to be tied to dentry */ {
 889                 d_instantiate(tmp_dentry, tmp_inode);
 890                 if (rc == 2)
 891                         d_rehash(tmp_dentry);
 892         }
 893
 894
 895         rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
 896                      tmp_inode->i_ino, obj_type);
 897         if (rc) {
 898                 cFYI(1, ("filldir rc = %d", rc));
 899                 /* we can not return filldir errors to the caller
 900                 since they are "normal" when the stat blocksize
 901                 is too small - we return remapped error instead */
 902                 rc = -EOVERFLOW;
 903         }
 904
 905         dput(tmp_dentry);
 906         return rc;
 907 }
 908
 909 static int cifs_save_resume_key(const char *current_entry,
 910         struct cifsFileInfo *cifsFile)
 911 {
 912         int rc = 0;
 913         unsigned int len = 0;
 914         __u16 level;
 915         char *filename;
 916
 917         if ((cifsFile == NULL) || (current_entry == NULL))
 918                 return -EINVAL;
 919
 920         level = cifsFile->srch_inf.info_level;
 921
 922         if (level == SMB_FIND_FILE_UNIX) {
 923                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 924
 925                 filename = &pFindData->FileName[0];
 926                 if (cifsFile->srch_inf.unicode) {
 927                         len = cifs_unicode_bytelen(filename);
 928                 } else {
 929                         /* BB should we make this strnlen of PATH_MAX? */
 930                         len = strnlen(filename, PATH_MAX);
 931                 }
 932                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 933         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
 934                 FILE_DIRECTORY_INFO *pFindData =
 935                         (FILE_DIRECTORY_INFO *)current_entry;
 936                 filename = &pFindData->FileName[0];
 937                 len = le32_to_cpu(pFindData->FileNameLength);
 938                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 939         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 940                 FILE_FULL_DIRECTORY_INFO *pFindData =
 941                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 942                 filename = &pFindData->FileName[0];
 943                 len = le32_to_cpu(pFindData->FileNameLength);
 944                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 945         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 946                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 947                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 948                 filename = &pFindData->FileName[0];
 949                 len = le32_to_cpu(pFindData->FileNameLength);
 950                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 951         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 952                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 953                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 954                 filename = &pFindData->FileName[0];
 955                 len = le32_to_cpu(pFindData->FileNameLength);
 956                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 957         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
 958                 FIND_FILE_STANDARD_INFO *pFindData =
 959                         (FIND_FILE_STANDARD_INFO *)current_entry;
 960                 filename = &pFindData->FileName[0];
 961                 /* one byte length, no name conversion */
 962                 len = (unsigned int)pFindData->FileNameLength;
 963                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 964         } else {
 965                 cFYI(1, ("Unknown findfirst level %d", level));
 966                 return -EINVAL;
 967         }
 968         cifsFile->srch_inf.resume_name_len = len;
 969         cifsFile->srch_inf.presume_name = filename;
 970         return rc;
 971 }
 972
 973 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 974 {
 975         int rc = 0;
 976         int xid, i;
 977         struct cifs_sb_info *cifs_sb;
 978         struct cifsTconInfo *pTcon;
 979         struct cifsFileInfo *cifsFile = NULL;
 980         char *current_entry;
 981         int num_to_fill = 0;
 982         char *tmp_buf = NULL;
 983         char *end_of_smb;
 984         int max_len;
 985
 986         xid = GetXid();
 987
 988         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 989         pTcon = cifs_sb->tcon;
 990         if (pTcon == NULL)
 991                 return -EINVAL;
 992
 993         switch ((int) file->f_pos) {
 994         case 0:
 995                 if (filldir(direntry, ".", 1, file->f_pos,
 996                      file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
 997                         cERROR(1, ("Filldir for current dir failed"));
 998                         rc = -ENOMEM;
 999                         break;
1000                 }
1001                 file->f_pos++;
1002         case 1:
1003                 if (filldir(direntry, "..", 2, file->f_pos,
1004                      file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1005                         cERROR(1, ("Filldir for parent dir failed"));
1006                         rc = -ENOMEM;
1007                         break;
1008                 }
1009                 file->f_pos++;
1010         default:
1011                 /* 1) If search is active,
1012                         is in current search buffer?
1013                         if it before then restart search
1014                         if after then keep searching till find it */
1015
1016                 if (file->private_data == NULL) {
1017                         rc = initiate_cifs_search(xid, file);
1018                         cFYI(1, ("initiate cifs search rc %d", rc));
1019                         if (rc) {
1020                                 FreeXid(xid);
1021                                 return rc;
1022                         }
1023                 }
1024                 if (file->private_data == NULL) {
1025                         rc = -EINVAL;
1026                         FreeXid(xid);
1027                         return rc;
1028                 }
1029                 cifsFile = file->private_data;
1030                 if (cifsFile->srch_inf.endOfSearch) {
1031                         if (cifsFile->srch_inf.emptyDir) {
1032                                 cFYI(1, ("End of search, empty dir"));
1033                                 rc = 0;
1034                                 break;
1035                         }
1036                 } /* else {
1037                         cifsFile->invalidHandle = TRUE;
1038                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1039                 }
1040                 kfree(cifsFile->search_resume_name);
1041                 cifsFile->search_resume_name = NULL; */
1042
1043                 rc = find_cifs_entry(xid, pTcon, file,
1044                                 &current_entry, &num_to_fill);
1045                 if (rc) {
1046                         cFYI(1, ("fce error %d", rc));
1047                         goto rddir2_exit;
1048                 } else if (current_entry != NULL) {
1049                         cFYI(1, ("entry %lld found", file->f_pos));
1050                 } else {
1051                         cFYI(1, ("could not find entry"));
1052                         goto rddir2_exit;
1053                 }
1054                 cFYI(1, ("loop through %d times filling dir for net buf %p",
1055                         num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1056                 max_len = smbCalcSize((struct smb_hdr *)
1057                                 cifsFile->srch_inf.ntwrk_buf_start);
1058                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1059
1060                 /* To be safe - for UCS to UTF-8 with strings loaded
1061                 with the rare long characters alloc more to account for
1062                 such multibyte target UTF-8 characters. cifs_unicode.c,
1063                 which actually does the conversion, has the same limit */
1064                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1065                 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1066                         if (current_entry == NULL) {
1067                                 /* evaluate whether this case is an error */
1068                                 cERROR(1,("past end of SMB num to fill %d i %d",
1069                                           num_to_fill, i));
1070                                 break;
1071                         }
1072                         /* if buggy server returns . and .. late do
1073                         we want to check for that here? */
1074                         rc = cifs_filldir(current_entry, file,
1075                                         filldir, direntry, tmp_buf, max_len);
1076                         if (rc == -EOVERFLOW) {
1077                                 rc = 0;
1078                                 break;
1079                         }
1080
1081                         file->f_pos++;
1082                         if (file->f_pos ==
1083                                 cifsFile->srch_inf.index_of_last_entry) {
1084                                 cFYI(1, ("last entry in buf at pos %lld %s",
1085                                         file->f_pos, tmp_buf));
1086                                 cifs_save_resume_key(current_entry, cifsFile);
1087                                 break;
1088                         } else
1089                                 current_entry =
1090                                         nxt_dir_entry(current_entry, end_of_smb,
1091                                                 cifsFile->srch_inf.info_level);
1092                 }
1093                 kfree(tmp_buf);
1094                 break;
1095         } /* end switch */
1096
1097 rddir2_exit:
1098         FreeXid(xid);
1099         return rc;
1100 }