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         /* but now check for them on the share/mount not on the SMB session */
 467 /*      if (pTcon->ses->capabilities & CAP_UNIX) { */
 468         if (pTcon->unix_ext) {
 469                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 470         } else if ((pTcon->ses->capabilities &
 471                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 472                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 473         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 474                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 475         } else /* not srvinos - BB fixme add check for backlevel? */ {
 476                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 477         }
 478
 479         rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
 480                 &cifsFile->netfid, &cifsFile->srch_inf,
 481                 cifs_sb->mnt_cifs_flags &
 482                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 483         if (rc == 0)
 484                 cifsFile->invalidHandle = FALSE;
 485         if ((rc == -EOPNOTSUPP) &&
 486                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 487                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 488                 goto ffirst_retry;
 489         }
 490         kfree(full_path);
 491         return rc;
 492 }
 493
 494 /* return length of unicode string in bytes */
 495 static int cifs_unicode_bytelen(char *str)
 496 {
 497         int len;
 498         __le16 * ustr = (__le16 *)str;
 499
 500         for (len = 0; len <= PATH_MAX; len++) {
 501                 if (ustr[len] == 0)
 502                         return len << 1;
 503         }
 504         cFYI(1, ("Unicode string longer than PATH_MAX found"));
 505         return len << 1;
 506 }
 507
 508 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 509 {
 510         char *new_entry;
 511         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 512
 513         if (level == SMB_FIND_FILE_INFO_STANDARD) {
 514                 FIND_FILE_STANDARD_INFO * pfData;
 515                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 516
 517                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 518                                 pfData->FileNameLength;
 519         } else
 520                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 521         cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
 522         /* validate that new_entry is not past end of SMB */
 523         if (new_entry >= end_of_smb) {
 524                 cERROR(1,
 525                       ("search entry %p began after end of SMB %p old entry %p",
 526                         new_entry, end_of_smb, old_entry));
 527                 return NULL;
 528         } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
 529                     (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
 530                   || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 531                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 532                 cERROR(1, ("search entry %p extends after end of SMB %p",
 533                         new_entry, end_of_smb));
 534                 return NULL;
 535         } else
 536                 return new_entry;
 537
 538 }
 539
 540 #define UNICODE_DOT cpu_to_le16(0x2e)
 541
 542 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 543 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 544 {
 545         int rc = 0;
 546         char *filename = NULL;
 547         int len = 0;
 548
 549         if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 550                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 551                 filename = &pFindData->FileName[0];
 552                 if (cfile->srch_inf.unicode) {
 553                         len = cifs_unicode_bytelen(filename);
 554                 } else {
 555                         /* BB should we make this strnlen of PATH_MAX? */
 556                         len = strnlen(filename, 5);
 557                 }
 558         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 559                 FILE_DIRECTORY_INFO * pFindData =
 560                         (FILE_DIRECTORY_INFO *)current_entry;
 561                 filename = &pFindData->FileName[0];
 562                 len = le32_to_cpu(pFindData->FileNameLength);
 563         } else if (cfile->srch_inf.info_level ==
 564                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 565                 FILE_FULL_DIRECTORY_INFO * pFindData =
 566                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 567                 filename = &pFindData->FileName[0];
 568                 len = le32_to_cpu(pFindData->FileNameLength);
 569         } else if (cfile->srch_inf.info_level ==
 570                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 571                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 572                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 573                 filename = &pFindData->FileName[0];
 574                 len = le32_to_cpu(pFindData->FileNameLength);
 575         } else if (cfile->srch_inf.info_level ==
 576                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 577                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 578                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 579                 filename = &pFindData->FileName[0];
 580                 len = le32_to_cpu(pFindData->FileNameLength);
 581         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 582                 FIND_FILE_STANDARD_INFO * pFindData =
 583                         (FIND_FILE_STANDARD_INFO *)current_entry;
 584                 filename = &pFindData->FileName[0];
 585                 len = pFindData->FileNameLength;
 586         } else {
 587                 cFYI(1, ("Unknown findfirst level %d",
 588                          cfile->srch_inf.info_level));
 589         }
 590
 591         if (filename) {
 592                 if (cfile->srch_inf.unicode) {
 593                         __le16 *ufilename = (__le16 *)filename;
 594                         if (len == 2) {
 595                                 /* check for . */
 596                                 if (ufilename[0] == UNICODE_DOT)
 597                                         rc = 1;
 598                         } else if (len == 4) {
 599                                 /* check for .. */
 600                                 if ((ufilename[0] == UNICODE_DOT)
 601                                    && (ufilename[1] == UNICODE_DOT))
 602                                         rc = 2;
 603                         }
 604                 } else /* ASCII */ {
 605                         if (len == 1) {
 606                                 if (filename[0] == '.')
 607                                         rc = 1;
 608                         } else if (len == 2) {
 609                                 if ((filename[0] == '.') && (filename[1] == '.'))
 610                                         rc = 2;
 611                         }
 612                 }
 613         }
 614
 615         return rc;
 616 }
 617
 618 /* Check if directory that we are searching has changed so we can decide
 619    whether we can use the cached search results from the previous search */
 620 static int is_dir_changed(struct file *file)
 621 {
 622         struct inode *inode = file->f_path.dentry->d_inode;
 623         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
 624
 625         if (cifsInfo->time == 0)
 626                 return 1; /* directory was changed, perhaps due to unlink */
 627         else
 628                 return 0;
 629
 630 }
 631
 632 /* find the corresponding entry in the search */
 633 /* Note that the SMB server returns search entries for . and .. which
 634    complicates logic here if we choose to parse for them and we do not
 635    assume that they are located in the findfirst return buffer.*/
 636 /* We start counting in the buffer with entry 2 and increment for every
 637    entry (do not increment for . or .. entry) */
 638 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 639         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 640 {
 641         int rc = 0;
 642         int pos_in_buf = 0;
 643         loff_t first_entry_in_buffer;
 644         loff_t index_to_find = file->f_pos;
 645         struct cifsFileInfo *cifsFile = file->private_data;
 646         /* check if index in the buffer */
 647
 648         if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 649            (num_to_ret == NULL))
 650                 return -ENOENT;
 651
 652         *ppCurrentEntry = NULL;
 653         first_entry_in_buffer =
 654                 cifsFile->srch_inf.index_of_last_entry -
 655                         cifsFile->srch_inf.entries_in_buffer;
 656
 657         /* if first entry in buf is zero then is first buffer
 658         in search response data which means it is likely . and ..
 659         will be in this buffer, although some servers do not return
 660         . and .. for the root of a drive and for those we need
 661         to start two entries earlier */
 662
 663 #ifdef CONFIG_CIFS_DEBUG2
 664         dump_cifs_file_struct(file, "In fce ");
 665 #endif
 666         if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 667              is_dir_changed(file)) ||
 668            (index_to_find < first_entry_in_buffer)) {
 669                 /* close and restart search */
 670                 cFYI(1, ("search backing up - close and restart search"));
 671                 cifsFile->invalidHandle = TRUE;
 672                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 673                 kfree(cifsFile->search_resume_name);
 674                 cifsFile->search_resume_name = NULL;
 675                 if (cifsFile->srch_inf.ntwrk_buf_start) {
 676                         cFYI(1, ("freeing SMB ff cache buf on search rewind"));
 677                         if (cifsFile->srch_inf.smallBuf)
 678                                 cifs_small_buf_release(cifsFile->srch_inf.
 679                                                 ntwrk_buf_start);
 680                         else
 681                                 cifs_buf_release(cifsFile->srch_inf.
 682                                                 ntwrk_buf_start);
 683                 }
 684                 rc = initiate_cifs_search(xid, file);
 685                 if (rc) {
 686                         cFYI(1, ("error %d reinitiating a search on rewind",
 687                                  rc));
 688                         return rc;
 689                 }
 690         }
 691
 692         while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 693               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)) {
 694                 cFYI(1, ("calling findnext2"));
 695                 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
 696                                   &cifsFile->srch_inf);
 697                 if (rc)
 698                         return -ENOENT;
 699         }
 700         if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 701                 /* we found the buffer that contains the entry */
 702                 /* scan and find it */
 703                 int i;
 704                 char *current_entry;
 705                 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 706                         smbCalcSize((struct smb_hdr *)
 707                                 cifsFile->srch_inf.ntwrk_buf_start);
 708
 709                 current_entry = cifsFile->srch_inf.srch_entries_start;
 710                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 711                                         - cifsFile->srch_inf.entries_in_buffer;
 712                 pos_in_buf = index_to_find - first_entry_in_buffer;
 713                 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
 714
 715                 for (i=0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
 716                         /* go entry by entry figuring out which is first */
 717                         current_entry = nxt_dir_entry(current_entry, end_of_smb,
 718                                                 cifsFile->srch_inf.info_level);
 719                 }
 720                 if ((current_entry == NULL) && (i < pos_in_buf)) {
 721                         /* BB fixme - check if we should flag this error */
 722                         cERROR(1, ("reached end of buf searching for pos in buf"
 723                           " %d index to find %lld rc %d",
 724                           pos_in_buf, index_to_find, rc));
 725                 }
 726                 rc = 0;
 727                 *ppCurrentEntry = current_entry;
 728         } else {
 729                 cFYI(1, ("index not in buffer - could not findnext into it"));
 730                 return 0;
 731         }
 732
 733         if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 734                 cFYI(1, ("can not return entries pos_in_buf beyond last"));
 735                 *num_to_ret = 0;
 736         } else
 737                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 738
 739         return rc;
 740 }
 741
 742 /* inode num, inode type and filename returned */
 743 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 744         char *current_entry, __u16 level, unsigned int unicode,
 745         struct cifs_sb_info *cifs_sb, int max_len, ino_t *pinum)
 746 {
 747         int rc = 0;
 748         unsigned int len = 0;
 749         char *filename;
 750         struct nls_table *nlt = cifs_sb->local_nls;
 751
 752         *pinum = 0;
 753
 754         if (level == SMB_FIND_FILE_UNIX) {
 755                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
 756
 757                 filename = &pFindData->FileName[0];
 758                 if (unicode) {
 759                         len = cifs_unicode_bytelen(filename);
 760                 } else {
 761                         /* BB should we make this strnlen of PATH_MAX? */
 762                         len = strnlen(filename, PATH_MAX);
 763                 }
 764
 765                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
 766                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 767                         *pinum = pFindData->UniqueId;
 768         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
 769                 FILE_DIRECTORY_INFO *pFindData =
 770                         (FILE_DIRECTORY_INFO *)current_entry;
 771                 filename = &pFindData->FileName[0];
 772                 len = le32_to_cpu(pFindData->FileNameLength);
 773         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 774                 FILE_FULL_DIRECTORY_INFO *pFindData =
 775                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 776                 filename = &pFindData->FileName[0];
 777                 len = le32_to_cpu(pFindData->FileNameLength);
 778         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 779                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 780                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 781                 filename = &pFindData->FileName[0];
 782                 len = le32_to_cpu(pFindData->FileNameLength);
 783                 *pinum = pFindData->UniqueId;
 784         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 785                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 786                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 787                 filename = &pFindData->FileName[0];
 788                 len = le32_to_cpu(pFindData->FileNameLength);
 789         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
 790                 FIND_FILE_STANDARD_INFO * pFindData =
 791                         (FIND_FILE_STANDARD_INFO *)current_entry;
 792                 filename = &pFindData->FileName[0];
 793                 /* one byte length, no name conversion */
 794                 len = (unsigned int)pFindData->FileNameLength;
 795         } else {
 796                 cFYI(1, ("Unknown findfirst level %d", level));
 797                 return -EINVAL;
 798         }
 799
 800         if (len > max_len) {
 801                 cERROR(1, ("bad search response length %d past smb end", len));
 802                 return -EINVAL;
 803         }
 804
 805         if (unicode) {
 806                 /* BB fixme - test with long names */
 807                 /* Note converted filename can be longer than in unicode */
 808                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 809                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 810                                         (__le16 *)filename, len/2, nlt);
 811                 else
 812                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 813                                         (__le16 *)filename, len/2, nlt);
 814         } else {
 815                 pqst->name = filename;
 816                 pqst->len = len;
 817         }
 818         pqst->hash = full_name_hash(pqst->name, pqst->len);
 819 /*      cFYI(1, ("filldir on %s",pqst->name));  */
 820         return rc;
 821 }
 822
 823 static int cifs_filldir(char *pfindEntry, struct file *file,
 824         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 825 {
 826         int rc = 0;
 827         struct qstr qstring;
 828         struct cifsFileInfo *pCifsF;
 829         unsigned obj_type;
 830         ino_t  inum;
 831         struct cifs_sb_info *cifs_sb;
 832         struct inode *tmp_inode;
 833         struct dentry *tmp_dentry;
 834
 835         /* get filename and len into qstring */
 836         /* get dentry */
 837         /* decide whether to create and populate ionde */
 838         if ((direntry == NULL) || (file == NULL))
 839                 return -EINVAL;
 840
 841         pCifsF = file->private_data;
 842
 843         if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 844                 return -ENOENT;
 845
 846         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_path.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
 871                          *  necessary BB */
 872                         tmp_inode->i_ino = inum;
 873                 }
 874                 insert_inode_hash(tmp_inode);
 875         }
 876
 877         /* we pass in rc below, indicating whether it is a new inode,
 878            so we can figure out whether to invalidate the inode cached
 879            data if the file has changed */
 880         if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 881                 unix_fill_in_inode(tmp_inode,
 882                                    (FILE_UNIX_INFO *)pfindEntry,
 883                                    &obj_type, rc);
 884         else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 885                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 886                                 pfindEntry, &obj_type, rc);
 887         else
 888                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 889
 890         if (rc) /* new inode - needs to be tied to dentry */ {
 891                 d_instantiate(tmp_dentry, tmp_inode);
 892                 if (rc == 2)
 893                         d_rehash(tmp_dentry);
 894         }
 895
 896
 897         rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
 898                      tmp_inode->i_ino, obj_type);
 899         if (rc) {
 900                 cFYI(1, ("filldir rc = %d", rc));
 901                 /* we can not return filldir errors to the caller
 902                 since they are "normal" when the stat blocksize
 903                 is too small - we return remapped error instead */
 904                 rc = -EOVERFLOW;
 905         }
 906
 907         dput(tmp_dentry);
 908         return rc;
 909 }
 910
 911 static int cifs_save_resume_key(const char *current_entry,
 912         struct cifsFileInfo *cifsFile)
 913 {
 914         int rc = 0;
 915         unsigned int len = 0;
 916         __u16 level;
 917         char *filename;
 918
 919         if ((cifsFile == NULL) || (current_entry == NULL))
 920                 return -EINVAL;
 921
 922         level = cifsFile->srch_inf.info_level;
 923
 924         if (level == SMB_FIND_FILE_UNIX) {
 925                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 926
 927                 filename = &pFindData->FileName[0];
 928                 if (cifsFile->srch_inf.unicode) {
 929                         len = cifs_unicode_bytelen(filename);
 930                 } else {
 931                         /* BB should we make this strnlen of PATH_MAX? */
 932                         len = strnlen(filename, PATH_MAX);
 933                 }
 934                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 935         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
 936                 FILE_DIRECTORY_INFO *pFindData =
 937                         (FILE_DIRECTORY_INFO *)current_entry;
 938                 filename = &pFindData->FileName[0];
 939                 len = le32_to_cpu(pFindData->FileNameLength);
 940                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 941         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 942                 FILE_FULL_DIRECTORY_INFO *pFindData =
 943                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 944                 filename = &pFindData->FileName[0];
 945                 len = le32_to_cpu(pFindData->FileNameLength);
 946                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 947         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 948                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 949                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 950                 filename = &pFindData->FileName[0];
 951                 len = le32_to_cpu(pFindData->FileNameLength);
 952                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 953         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 954                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 955                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 956                 filename = &pFindData->FileName[0];
 957                 len = le32_to_cpu(pFindData->FileNameLength);
 958                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 959         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
 960                 FIND_FILE_STANDARD_INFO *pFindData =
 961                         (FIND_FILE_STANDARD_INFO *)current_entry;
 962                 filename = &pFindData->FileName[0];
 963                 /* one byte length, no name conversion */
 964                 len = (unsigned int)pFindData->FileNameLength;
 965                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 966         } else {
 967                 cFYI(1, ("Unknown findfirst level %d", level));
 968                 return -EINVAL;
 969         }
 970         cifsFile->srch_inf.resume_name_len = len;
 971         cifsFile->srch_inf.presume_name = filename;
 972         return rc;
 973 }
 974
 975 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 976 {
 977         int rc = 0;
 978         int xid, i;
 979         struct cifs_sb_info *cifs_sb;
 980         struct cifsTconInfo *pTcon;
 981         struct cifsFileInfo *cifsFile = NULL;
 982         char *current_entry;
 983         int num_to_fill = 0;
 984         char *tmp_buf = NULL;
 985         char *end_of_smb;
 986         int max_len;
 987
 988         xid = GetXid();
 989
 990         cifs_sb = CIFS_SB(file->f_path.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_path.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_path.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                         if (rc == -EOVERFLOW) {
1079                                 rc = 0;
1080                                 break;
1081                         }
1082
1083                         file->f_pos++;
1084                         if (file->f_pos ==
1085                                 cifsFile->srch_inf.index_of_last_entry) {
1086                                 cFYI(1, ("last entry in buf at pos %lld %s",
1087                                         file->f_pos, tmp_buf));
1088                                 cifs_save_resume_key(current_entry, cifsFile);
1089                                 break;
1090                         } else
1091                                 current_entry =
1092                                         nxt_dir_entry(current_entry, end_of_smb,
1093                                                 cifsFile->srch_inf.info_level);
1094                 }
1095                 kfree(tmp_buf);
1096                 break;
1097         } /* end switch */
1098
1099 rddir2_exit:
1100         FreeXid(xid);
1101         return rc;
1102 }