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