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, 2008
   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                 if (cf->srch_inf.endOfSearch)
  48                         cFYI(1, ("end of search"));
  49                 if (cf->srch_inf.emptyDir)
  50                         cFYI(1, ("empty dir"));
  51         }
  52 }
  53 #else
  54 static inline void dump_cifs_file_struct(struct file *file, char *label)
  55 {
  56 }
  57 #endif /* DEBUG2 */
  58
  59 /* Returns one if new inode created (which therefore needs to be hashed) */
  60 /* Might check in the future if inode number changed so we can rehash inode */
  61 static int construct_dentry(struct qstr *qstring, struct file *file,
  62         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  63 {
  64         struct dentry *tmp_dentry;
  65         struct cifs_sb_info *cifs_sb;
  66         struct cifsTconInfo *pTcon;
  67         int rc = 0;
  68
  69         cFYI(1, ("For %s", qstring->name));
  70         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
  71         pTcon = cifs_sb->tcon;
  72
  73         qstring->hash = full_name_hash(qstring->name, qstring->len);
  74         tmp_dentry = d_lookup(file->f_path.dentry, qstring);
  75         if (tmp_dentry) {
  76                 cFYI(0, ("existing dentry with inode 0x%p",
  77                          tmp_dentry->d_inode));
  78                 *ptmp_inode = tmp_dentry->d_inode;
  79 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
  80                 if (*ptmp_inode == NULL) {
  81                         *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
  82                         if (*ptmp_inode == NULL)
  83                                 return rc;
  84                         rc = 1;
  85                 }
  86                 if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
  87                         (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
  88         } else {
  89                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
  90                 if (tmp_dentry == NULL) {
  91                         cERROR(1, ("Failed allocating dentry"));
  92                         *ptmp_inode = NULL;
  93                         return rc;
  94                 }
  95
  96                 *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
  97                 if (pTcon->nocase)
  98                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
  99                 else
 100                         tmp_dentry->d_op = &cifs_dentry_ops;
 101                 if (*ptmp_inode == NULL)
 102                         return rc;
 103                 if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
 104                         (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
 105                 rc = 2;
 106         }
 107
 108         tmp_dentry->d_time = jiffies;
 109         *pnew_dentry = tmp_dentry;
 110         return rc;
 111 }
 112
 113 static void AdjustForTZ(struct cifsTconInfo *tcon, struct inode *inode)
 114 {
 115         if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
 116                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
 117                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
 118                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
 119         }
 120         return;
 121 }
 122
 123
 124 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
 125                           char *buf, unsigned int *pobject_type, int isNewInode)
 126 {
 127         loff_t local_size;
 128         struct timespec local_mtime;
 129
 130         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 131         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 132         __u32 attr;
 133         __u64 allocation_size;
 134         __u64 end_of_file;
 135
 136         /* save mtime and size */
 137         local_mtime = tmp_inode->i_mtime;
 138         local_size  = tmp_inode->i_size;
 139
 140         if (new_buf_type) {
 141                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
 142
 143                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 144                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 145                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 146                 tmp_inode->i_atime =
 147                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 148                 tmp_inode->i_mtime =
 149                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 150                 tmp_inode->i_ctime =
 151                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 152         } else { /* legacy, OS2 and DOS style */
 153 /*              struct timespec ts;*/
 154                 FIND_FILE_STANDARD_INFO *pfindData =
 155                         (FIND_FILE_STANDARD_INFO *)buf;
 156
 157                 tmp_inode->i_mtime = cnvrtDosUnixTm(
 158                                 le16_to_cpu(pfindData->LastWriteDate),
 159                                 le16_to_cpu(pfindData->LastWriteTime));
 160                 tmp_inode->i_atime = cnvrtDosUnixTm(
 161                                 le16_to_cpu(pfindData->LastAccessDate),
 162                                 le16_to_cpu(pfindData->LastAccessTime));
 163                 tmp_inode->i_ctime = cnvrtDosUnixTm(
 164                                 le16_to_cpu(pfindData->LastWriteDate),
 165                                 le16_to_cpu(pfindData->LastWriteTime));
 166                 AdjustForTZ(cifs_sb->tcon, tmp_inode);
 167                 attr = le16_to_cpu(pfindData->Attributes);
 168                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
 169                 end_of_file = le32_to_cpu(pfindData->DataSize);
 170         }
 171
 172         /* Linux can not store file creation time unfortunately so ignore it */
 173
 174         cifsInfo->cifsAttrs = attr;
 175 #ifdef CONFIG_CIFS_EXPERIMENTAL
 176         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 177                 /* get more accurate mode via ACL - so force inode refresh */
 178                 cifsInfo->time = 0;
 179         } else
 180 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 181                 cifsInfo->time = jiffies;
 182
 183         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 184         /* 2767 perms - indicate mandatory locking */
 185                 /* BB fill in uid and gid here? with help from winbind?
 186                    or retrieve from NTFS stream extended attribute */
 187         if (atomic_read(&cifsInfo->inUse) == 0) {
 188                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 189                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 190                 /* set default mode. will override for dirs below */
 191                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 192         } else {
 193                 /* mask off the type bits since it gets set
 194                 below and we do not want to get two type
 195                 bits set */
 196                 tmp_inode->i_mode &= ~S_IFMT;
 197         }
 198
 199         if (attr & ATTR_DIRECTORY) {
 200                 *pobject_type = DT_DIR;
 201                 /* override default perms since we do not lock dirs */
 202                 if (atomic_read(&cifsInfo->inUse) == 0)
 203                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 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         spin_lock(&tmp_inode->i_lock);
 238         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 239                 /* can not safely change the file size here if the
 240                 client is writing to it due to potential races */
 241                 i_size_write(tmp_inode, end_of_file);
 242
 243         /* 512 bytes (2**9) is the fake blocksize that must be used */
 244         /* for this calculation, even though the reported blocksize is larger */
 245                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 246         }
 247         spin_unlock(&tmp_inode->i_lock);
 248
 249         if (allocation_size < end_of_file)
 250                 cFYI(1, ("May be sparse file, allocation less than file size"));
 251         cFYI(1, ("File Size %ld and blocks %llu",
 252                 (unsigned long)tmp_inode->i_size,
 253                 (unsigned long long)tmp_inode->i_blocks));
 254         if (S_ISREG(tmp_inode->i_mode)) {
 255                 cFYI(1, ("File inode"));
 256                 tmp_inode->i_op = &cifs_file_inode_ops;
 257                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 258                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 259                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 260                         else
 261                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 262                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 263                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 264                 else
 265                         tmp_inode->i_fop = &cifs_file_ops;
 266
 267                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 268                    (cifs_sb->tcon->ses->server->maxBuf <
 269                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 270                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 271                 else
 272                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 273
 274                 if (isNewInode)
 275                         return; /* No sense invalidating pages for new inode
 276                                    since have not started caching readahead file
 277                                    data yet */
 278
 279                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 280                         (local_size == tmp_inode->i_size)) {
 281                         cFYI(1, ("inode exists but unchanged"));
 282                 } else {
 283                         /* file may have changed on server */
 284                         cFYI(1, ("invalidate inode, readdir detected change"));
 285                         invalidate_remote_inode(tmp_inode);
 286                 }
 287         } else if (S_ISDIR(tmp_inode->i_mode)) {
 288                 cFYI(1, ("Directory inode"));
 289                 tmp_inode->i_op = &cifs_dir_inode_ops;
 290                 tmp_inode->i_fop = &cifs_dir_ops;
 291         } else if (S_ISLNK(tmp_inode->i_mode)) {
 292                 cFYI(1, ("Symbolic Link inode"));
 293                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 294         } else {
 295                 cFYI(1, ("Init special inode"));
 296                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 297                                    tmp_inode->i_rdev);
 298         }
 299 }
 300
 301 static void unix_fill_in_inode(struct inode *tmp_inode,
 302         FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
 303 {
 304         loff_t local_size;
 305         struct timespec local_mtime;
 306
 307         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 308         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 309
 310         __u32 type = le32_to_cpu(pfindData->Type);
 311         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 312         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 313         cifsInfo->time = jiffies;
 314         atomic_inc(&cifsInfo->inUse);
 315
 316         /* save mtime and size */
 317         local_mtime = tmp_inode->i_mtime;
 318         local_size  = tmp_inode->i_size;
 319
 320         tmp_inode->i_atime =
 321             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 322         tmp_inode->i_mtime =
 323             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 324         tmp_inode->i_ctime =
 325             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 326
 327         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 328         /* since we set the inode type below we need to mask off type
 329            to avoid strange results if bits above were corrupt */
 330         tmp_inode->i_mode &= ~S_IFMT;
 331         if (type == UNIX_FILE) {
 332                 *pobject_type = DT_REG;
 333                 tmp_inode->i_mode |= S_IFREG;
 334         } else if (type == UNIX_SYMLINK) {
 335                 *pobject_type = DT_LNK;
 336                 tmp_inode->i_mode |= S_IFLNK;
 337         } else if (type == UNIX_DIR) {
 338                 *pobject_type = DT_DIR;
 339                 tmp_inode->i_mode |= S_IFDIR;
 340         } else if (type == UNIX_CHARDEV) {
 341                 *pobject_type = DT_CHR;
 342                 tmp_inode->i_mode |= S_IFCHR;
 343                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 344                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 345         } else if (type == UNIX_BLOCKDEV) {
 346                 *pobject_type = DT_BLK;
 347                 tmp_inode->i_mode |= S_IFBLK;
 348                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 349                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 350         } else if (type == UNIX_FIFO) {
 351                 *pobject_type = DT_FIFO;
 352                 tmp_inode->i_mode |= S_IFIFO;
 353         } else if (type == UNIX_SOCKET) {
 354                 *pobject_type = DT_SOCK;
 355                 tmp_inode->i_mode |= S_IFSOCK;
 356         } else {
 357                 /* safest to just call it a file */
 358                 *pobject_type = DT_REG;
 359                 tmp_inode->i_mode |= S_IFREG;
 360                 cFYI(1, ("unknown inode type %d", type));
 361         }
 362
 363         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 364                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 365         else
 366                 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 367         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 368                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 369         else
 370                 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 371         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 372
 373         spin_lock(&tmp_inode->i_lock);
 374         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 375                 /* can not safely change the file size here if the
 376                 client is writing to it due to potential races */
 377                 i_size_write(tmp_inode, end_of_file);
 378
 379         /* 512 bytes (2**9) is the fake blocksize that must be used */
 380         /* for this calculation, not the real blocksize */
 381                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 382         }
 383         spin_unlock(&tmp_inode->i_lock);
 384
 385         if (S_ISREG(tmp_inode->i_mode)) {
 386                 cFYI(1, ("File inode"));
 387                 tmp_inode->i_op = &cifs_file_inode_ops;
 388
 389                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 390                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 391                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 392                         else
 393                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 394                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 395                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 396                 else
 397                         tmp_inode->i_fop = &cifs_file_ops;
 398
 399                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 400                    (cifs_sb->tcon->ses->server->maxBuf <
 401                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 402                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 403                 else
 404                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 405
 406                 if (isNewInode)
 407                         return; /* No sense invalidating pages for new inode
 408                                    since we have not started caching readahead
 409                                    file data for it yet */
 410
 411                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 412                         (local_size == tmp_inode->i_size)) {
 413                         cFYI(1, ("inode exists but unchanged"));
 414                 } else {
 415                         /* file may have changed on server */
 416                         cFYI(1, ("invalidate inode, readdir detected change"));
 417                         invalidate_remote_inode(tmp_inode);
 418                 }
 419         } else if (S_ISDIR(tmp_inode->i_mode)) {
 420                 cFYI(1, ("Directory inode"));
 421                 tmp_inode->i_op = &cifs_dir_inode_ops;
 422                 tmp_inode->i_fop = &cifs_dir_ops;
 423         } else if (S_ISLNK(tmp_inode->i_mode)) {
 424                 cFYI(1, ("Symbolic Link inode"));
 425                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 426 /* tmp_inode->i_fop = *//* do not need to set to anything */
 427         } else {
 428                 cFYI(1, ("Special inode"));
 429                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 430                                    tmp_inode->i_rdev);
 431         }
 432 }
 433
 434 static int initiate_cifs_search(const int xid, struct file *file)
 435 {
 436         int rc = 0;
 437         char *full_path;
 438         struct cifsFileInfo *cifsFile;
 439         struct cifs_sb_info *cifs_sb;
 440         struct cifsTconInfo *pTcon;
 441
 442         if (file->private_data == NULL) {
 443                 file->private_data =
 444                         kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
 445         }
 446
 447         if (file->private_data == NULL)
 448                 return -ENOMEM;
 449         cifsFile = file->private_data;
 450         cifsFile->invalidHandle = true;
 451         cifsFile->srch_inf.endOfSearch = false;
 452
 453         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 454         if (cifs_sb == NULL)
 455                 return -EINVAL;
 456
 457         pTcon = cifs_sb->tcon;
 458         if (pTcon == NULL)
 459                 return -EINVAL;
 460
 461         full_path = build_path_from_dentry(file->f_path.dentry);
 462
 463         if (full_path == NULL)
 464                 return -ENOMEM;
 465
 466         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 467
 468 ffirst_retry:
 469         /* test for Unix extensions */
 470         /* but now check for them on the share/mount not on the SMB session */
 471 /*      if (pTcon->ses->capabilities & CAP_UNIX) { */
 472         if (pTcon->unix_ext)
 473                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 474         else if ((pTcon->ses->capabilities &
 475                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 476                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 477         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 478                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 479         } else /* not srvinos - BB fixme add check for backlevel? */ {
 480                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 481         }
 482
 483         rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
 484                 &cifsFile->netfid, &cifsFile->srch_inf,
 485                 cifs_sb->mnt_cifs_flags &
 486                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 487         if (rc == 0)
 488                 cifsFile->invalidHandle = false;
 489         if ((rc == -EOPNOTSUPP) &&
 490                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 491                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 492                 goto ffirst_retry;
 493         }
 494         kfree(full_path);
 495         return rc;
 496 }
 497
 498 /* return length of unicode string in bytes */
 499 static int cifs_unicode_bytelen(char *str)
 500 {
 501         int len;
 502         __le16 *ustr = (__le16 *)str;
 503
 504         for (len = 0; len <= PATH_MAX; len++) {
 505                 if (ustr[len] == 0)
 506                         return len << 1;
 507         }
 508         cFYI(1, ("Unicode string longer than PATH_MAX found"));
 509         return len << 1;
 510 }
 511
 512 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 513 {
 514         char *new_entry;
 515         FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 516
 517         if (level == SMB_FIND_FILE_INFO_STANDARD) {
 518                 FIND_FILE_STANDARD_INFO *pfData;
 519                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 520
 521                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 522                                 pfData->FileNameLength;
 523         } else
 524                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 525         cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
 526         /* validate that new_entry is not past end of SMB */
 527         if (new_entry >= end_of_smb) {
 528                 cERROR(1,
 529                       ("search entry %p began after end of SMB %p old entry %p",
 530                         new_entry, end_of_smb, old_entry));
 531                 return NULL;
 532         } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
 533                     (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
 534                   || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 535                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 536                 cERROR(1, ("search entry %p extends after end of SMB %p",
 537                         new_entry, end_of_smb));
 538                 return NULL;
 539         } else
 540                 return new_entry;
 541
 542 }
 543
 544 #define UNICODE_DOT cpu_to_le16(0x2e)
 545
 546 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 547 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 548 {
 549         int rc = 0;
 550         char *filename = NULL;
 551         int len = 0;
 552
 553         if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 554                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
 555                 filename = &pFindData->FileName[0];
 556                 if (cfile->srch_inf.unicode) {
 557                         len = cifs_unicode_bytelen(filename);
 558                 } else {
 559                         /* BB should we make this strnlen of PATH_MAX? */
 560                         len = strnlen(filename, 5);
 561                 }
 562         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 563                 FILE_DIRECTORY_INFO *pFindData =
 564                         (FILE_DIRECTORY_INFO *)current_entry;
 565                 filename = &pFindData->FileName[0];
 566                 len = le32_to_cpu(pFindData->FileNameLength);
 567         } else if (cfile->srch_inf.info_level ==
 568                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 569                 FILE_FULL_DIRECTORY_INFO *pFindData =
 570                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 571                 filename = &pFindData->FileName[0];
 572                 len = le32_to_cpu(pFindData->FileNameLength);
 573         } else if (cfile->srch_inf.info_level ==
 574                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 575                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 576                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 577                 filename = &pFindData->FileName[0];
 578                 len = le32_to_cpu(pFindData->FileNameLength);
 579         } else if (cfile->srch_inf.info_level ==
 580                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 581                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 582                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 583                 filename = &pFindData->FileName[0];
 584                 len = le32_to_cpu(pFindData->FileNameLength);
 585         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 586                 FIND_FILE_STANDARD_INFO *pFindData =
 587                         (FIND_FILE_STANDARD_INFO *)current_entry;
 588                 filename = &pFindData->FileName[0];
 589                 len = pFindData->FileNameLength;
 590         } else {
 591                 cFYI(1, ("Unknown findfirst level %d",
 592                          cfile->srch_inf.info_level));
 593         }
 594
 595         if (filename) {
 596                 if (cfile->srch_inf.unicode) {
 597                         __le16 *ufilename = (__le16 *)filename;
 598                         if (len == 2) {
 599                                 /* check for . */
 600                                 if (ufilename[0] == UNICODE_DOT)
 601                                         rc = 1;
 602                         } else if (len == 4) {
 603                                 /* check for .. */
 604                                 if ((ufilename[0] == UNICODE_DOT)
 605                                    && (ufilename[1] == UNICODE_DOT))
 606                                         rc = 2;
 607                         }
 608                 } else /* ASCII */ {
 609                         if (len == 1) {
 610                                 if (filename[0] == '.')
 611                                         rc = 1;
 612                         } else if (len == 2) {
 613                                 if ((filename[0] == '.') && (filename[1] == '.'))
 614                                         rc = 2;
 615                         }
 616                 }
 617         }
 618
 619         return rc;
 620 }
 621
 622 /* Check if directory that we are searching has changed so we can decide
 623    whether we can use the cached search results from the previous search */
 624 static int is_dir_changed(struct file *file)
 625 {
 626         struct inode *inode = file->f_path.dentry->d_inode;
 627         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
 628
 629         if (cifsInfo->time == 0)
 630                 return 1; /* directory was changed, perhaps due to unlink */
 631         else
 632                 return 0;
 633
 634 }
 635
 636 /* find the corresponding entry in the search */
 637 /* Note that the SMB server returns search entries for . and .. which
 638    complicates logic here if we choose to parse for them and we do not
 639    assume that they are located in the findfirst return buffer.*/
 640 /* We start counting in the buffer with entry 2 and increment for every
 641    entry (do not increment for . or .. entry) */
 642 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 643         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 644 {
 645         int rc = 0;
 646         int pos_in_buf = 0;
 647         loff_t first_entry_in_buffer;
 648         loff_t index_to_find = file->f_pos;
 649         struct cifsFileInfo *cifsFile = file->private_data;
 650         /* check if index in the buffer */
 651
 652         if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 653            (num_to_ret == NULL))
 654                 return -ENOENT;
 655
 656         *ppCurrentEntry = NULL;
 657         first_entry_in_buffer =
 658                 cifsFile->srch_inf.index_of_last_entry -
 659                         cifsFile->srch_inf.entries_in_buffer;
 660
 661         /* if first entry in buf is zero then is first buffer
 662         in search response data which means it is likely . and ..
 663         will be in this buffer, although some servers do not return
 664         . and .. for the root of a drive and for those we need
 665         to start two entries earlier */
 666
 667         dump_cifs_file_struct(file, "In fce ");
 668         if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 669              is_dir_changed(file)) ||
 670            (index_to_find < first_entry_in_buffer)) {
 671                 /* close and restart search */
 672                 cFYI(1, ("search backing up - close and restart search"));
 673                 cifsFile->invalidHandle = true;
 674                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 675                 kfree(cifsFile->search_resume_name);
 676                 cifsFile->search_resume_name = NULL;
 677                 if (cifsFile->srch_inf.ntwrk_buf_start) {
 678                         cFYI(1, ("freeing SMB ff cache buf on search rewind"));
 679                         if (cifsFile->srch_inf.smallBuf)
 680                                 cifs_small_buf_release(cifsFile->srch_inf.
 681                                                 ntwrk_buf_start);
 682                         else
 683                                 cifs_buf_release(cifsFile->srch_inf.
 684                                                 ntwrk_buf_start);
 685                 }
 686                 rc = initiate_cifs_search(xid, file);
 687                 if (rc) {
 688                         cFYI(1, ("error %d reinitiating a search on rewind",
 689                                  rc));
 690                         return rc;
 691                 }
 692         }
 693
 694         while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 695               (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
 696                 cFYI(1, ("calling findnext2"));
 697                 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
 698                                   &cifsFile->srch_inf);
 699                 if (rc)
 700                         return -ENOENT;
 701         }
 702         if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 703                 /* we found the buffer that contains the entry */
 704                 /* scan and find it */
 705                 int i;
 706                 char *current_entry;
 707                 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 708                         smbCalcSize((struct smb_hdr *)
 709                                 cifsFile->srch_inf.ntwrk_buf_start);
 710
 711                 current_entry = cifsFile->srch_inf.srch_entries_start;
 712                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 713                                         - cifsFile->srch_inf.entries_in_buffer;
 714                 pos_in_buf = index_to_find - first_entry_in_buffer;
 715                 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
 716
 717                 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
 718                         /* go entry by entry figuring out which is first */
 719                         current_entry = nxt_dir_entry(current_entry, end_of_smb,
 720                                                 cifsFile->srch_inf.info_level);
 721                 }
 722                 if ((current_entry == NULL) && (i < pos_in_buf)) {
 723                         /* BB fixme - check if we should flag this error */
 724                         cERROR(1, ("reached end of buf searching for pos in buf"
 725                           " %d index to find %lld rc %d",
 726                           pos_in_buf, index_to_find, rc));
 727                 }
 728                 rc = 0;
 729                 *ppCurrentEntry = current_entry;
 730         } else {
 731                 cFYI(1, ("index not in buffer - could not findnext into it"));
 732                 return 0;
 733         }
 734
 735         if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 736                 cFYI(1, ("can not return entries pos_in_buf beyond last"));
 737                 *num_to_ret = 0;
 738         } else
 739                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 740
 741         return rc;
 742 }
 743
 744 /* inode num, inode type and filename returned */
 745 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 746         char *current_entry, __u16 level, unsigned int unicode,
 747         struct cifs_sb_info *cifs_sb, int max_len, ino_t *pinum)
 748 {
 749         int rc = 0;
 750         unsigned int len = 0;
 751         char *filename;
 752         struct nls_table *nlt = cifs_sb->local_nls;
 753
 754         *pinum = 0;
 755
 756         if (level == SMB_FIND_FILE_UNIX) {
 757                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
 758
 759                 filename = &pFindData->FileName[0];
 760                 if (unicode) {
 761                         len = cifs_unicode_bytelen(filename);
 762                 } else {
 763                         /* BB should we make this strnlen of PATH_MAX? */
 764                         len = strnlen(filename, PATH_MAX);
 765                 }
 766
 767                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
 768                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 769                         *pinum = pFindData->UniqueId;
 770         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
 771                 FILE_DIRECTORY_INFO *pFindData =
 772                         (FILE_DIRECTORY_INFO *)current_entry;
 773                 filename = &pFindData->FileName[0];
 774                 len = le32_to_cpu(pFindData->FileNameLength);
 775         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 776                 FILE_FULL_DIRECTORY_INFO *pFindData =
 777                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 778                 filename = &pFindData->FileName[0];
 779                 len = le32_to_cpu(pFindData->FileNameLength);
 780         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 781                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 782                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 783                 filename = &pFindData->FileName[0];
 784                 len = le32_to_cpu(pFindData->FileNameLength);
 785                 *pinum = pFindData->UniqueId;
 786         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 787                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 788                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 789                 filename = &pFindData->FileName[0];
 790                 len = le32_to_cpu(pFindData->FileNameLength);
 791         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
 792                 FIND_FILE_STANDARD_INFO *pFindData =
 793                         (FIND_FILE_STANDARD_INFO *)current_entry;
 794                 filename = &pFindData->FileName[0];
 795                 /* one byte length, no name conversion */
 796                 len = (unsigned int)pFindData->FileNameLength;
 797         } else {
 798                 cFYI(1, ("Unknown findfirst level %d", level));
 799                 return -EINVAL;
 800         }
 801
 802         if (len > max_len) {
 803                 cERROR(1, ("bad search response length %d past smb end", len));
 804                 return -EINVAL;
 805         }
 806
 807         if (unicode) {
 808                 /* BB fixme - test with long names */
 809                 /* Note converted filename can be longer than in unicode */
 810                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 811                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 812                                         (__le16 *)filename, len/2, nlt);
 813                 else
 814                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 815                                         (__le16 *)filename, len/2, nlt);
 816         } else {
 817                 pqst->name = filename;
 818                 pqst->len = len;
 819         }
 820         pqst->hash = full_name_hash(pqst->name, pqst->len);
 821 /*      cFYI(1, ("filldir on %s",pqst->name));  */
 822         return rc;
 823 }
 824
 825 static int cifs_filldir(char *pfindEntry, struct file *file,
 826         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 827 {
 828         int rc = 0;
 829         struct qstr qstring;
 830         struct cifsFileInfo *pCifsF;
 831         unsigned int obj_type;
 832         ino_t  inum;
 833         struct cifs_sb_info *cifs_sb;
 834         struct inode *tmp_inode;
 835         struct dentry *tmp_dentry;
 836
 837         /* get filename and len into qstring */
 838         /* get dentry */
 839         /* decide whether to create and populate ionde */
 840         if ((direntry == NULL) || (file == NULL))
 841                 return -EINVAL;
 842
 843         pCifsF = file->private_data;
 844
 845         if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 846                 return -ENOENT;
 847
 848         rc = cifs_entry_is_dot(pfindEntry, pCifsF);
 849         /* skip . and .. since we added them first */
 850         if (rc != 0)
 851                 return 0;
 852
 853         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 854
 855         qstring.name = scratch_buf;
 856         rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
 857                         pCifsF->srch_inf.info_level,
 858                         pCifsF->srch_inf.unicode, cifs_sb,
 859                         max_len,
 860                         &inum /* returned */);
 861
 862         if (rc)
 863                 return rc;
 864
 865         rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry);
 866         if ((tmp_inode == NULL) || (tmp_dentry == NULL))
 867                 return -ENOMEM;
 868
 869         if (rc) {
 870                 /* inode created, we need to hash it with right inode number */
 871                 if (inum != 0) {
 872                         /* BB fixme - hash the 2 32 quantities bits together if
 873                          *  necessary BB */
 874                         tmp_inode->i_ino = inum;
 875                 }
 876                 insert_inode_hash(tmp_inode);
 877         }
 878
 879         /* we pass in rc below, indicating whether it is a new inode,
 880            so we can figure out whether to invalidate the inode cached
 881            data if the file has changed */
 882         if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 883                 unix_fill_in_inode(tmp_inode,
 884                                    (FILE_UNIX_INFO *)pfindEntry,
 885                                    &obj_type, rc);
 886         else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 887                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 888                                 pfindEntry, &obj_type, rc);
 889         else
 890                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 891
 892         if (rc) /* new inode - needs to be tied to dentry */ {
 893                 d_instantiate(tmp_dentry, tmp_inode);
 894                 if (rc == 2)
 895                         d_rehash(tmp_dentry);
 896         }
 897
 898
 899         rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
 900                      tmp_inode->i_ino, obj_type);
 901         if (rc) {
 902                 cFYI(1, ("filldir rc = %d", rc));
 903                 /* we can not return filldir errors to the caller
 904                 since they are "normal" when the stat blocksize
 905                 is too small - we return remapped error instead */
 906                 rc = -EOVERFLOW;
 907         }
 908
 909         dput(tmp_dentry);
 910         return rc;
 911 }
 912
 913 static int cifs_save_resume_key(const char *current_entry,
 914         struct cifsFileInfo *cifsFile)
 915 {
 916         int rc = 0;
 917         unsigned int len = 0;
 918         __u16 level;
 919         char *filename;
 920
 921         if ((cifsFile == NULL) || (current_entry == NULL))
 922                 return -EINVAL;
 923
 924         level = cifsFile->srch_inf.info_level;
 925
 926         if (level == SMB_FIND_FILE_UNIX) {
 927                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
 928
 929                 filename = &pFindData->FileName[0];
 930                 if (cifsFile->srch_inf.unicode) {
 931                         len = cifs_unicode_bytelen(filename);
 932                 } else {
 933                         /* BB should we make this strnlen of PATH_MAX? */
 934                         len = strnlen(filename, PATH_MAX);
 935                 }
 936                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 937         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
 938                 FILE_DIRECTORY_INFO *pFindData =
 939                         (FILE_DIRECTORY_INFO *)current_entry;
 940                 filename = &pFindData->FileName[0];
 941                 len = le32_to_cpu(pFindData->FileNameLength);
 942                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 943         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 944                 FILE_FULL_DIRECTORY_INFO *pFindData =
 945                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 946                 filename = &pFindData->FileName[0];
 947                 len = le32_to_cpu(pFindData->FileNameLength);
 948                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 949         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 950                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 951                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 952                 filename = &pFindData->FileName[0];
 953                 len = le32_to_cpu(pFindData->FileNameLength);
 954                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 955         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 956                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 957                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 958                 filename = &pFindData->FileName[0];
 959                 len = le32_to_cpu(pFindData->FileNameLength);
 960                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 961         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
 962                 FIND_FILE_STANDARD_INFO *pFindData =
 963                         (FIND_FILE_STANDARD_INFO *)current_entry;
 964                 filename = &pFindData->FileName[0];
 965                 /* one byte length, no name conversion */
 966                 len = (unsigned int)pFindData->FileNameLength;
 967                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 968         } else {
 969                 cFYI(1, ("Unknown findfirst level %d", level));
 970                 return -EINVAL;
 971         }
 972         cifsFile->srch_inf.resume_name_len = len;
 973         cifsFile->srch_inf.presume_name = filename;
 974         return rc;
 975 }
 976
 977 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 978 {
 979         int rc = 0;
 980         int xid, i;
 981         struct cifs_sb_info *cifs_sb;
 982         struct cifsTconInfo *pTcon;
 983         struct cifsFileInfo *cifsFile = NULL;
 984         char *current_entry;
 985         int num_to_fill = 0;
 986         char *tmp_buf = NULL;
 987         char *end_of_smb;
 988         int max_len;
 989
 990         xid = GetXid();
 991
 992         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 993         pTcon = cifs_sb->tcon;
 994         if (pTcon == NULL)
 995                 return -EINVAL;
 996
 997         switch ((int) file->f_pos) {
 998         case 0:
 999                 if (filldir(direntry, ".", 1, file->f_pos,
1000                      file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1001                         cERROR(1, ("Filldir for current dir failed"));
1002                         rc = -ENOMEM;
1003                         break;
1004                 }
1005                 file->f_pos++;
1006         case 1:
1007                 if (filldir(direntry, "..", 2, file->f_pos,
1008                      file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1009                         cERROR(1, ("Filldir for parent dir failed"));
1010                         rc = -ENOMEM;
1011                         break;
1012                 }
1013                 file->f_pos++;
1014         default:
1015                 /* 1) If search is active,
1016                         is in current search buffer?
1017                         if it before then restart search
1018                         if after then keep searching till find it */
1019
1020                 if (file->private_data == NULL) {
1021                         rc = initiate_cifs_search(xid, file);
1022                         cFYI(1, ("initiate cifs search rc %d", rc));
1023                         if (rc) {
1024                                 FreeXid(xid);
1025                                 return rc;
1026                         }
1027                 }
1028                 if (file->private_data == NULL) {
1029                         rc = -EINVAL;
1030                         FreeXid(xid);
1031                         return rc;
1032                 }
1033                 cifsFile = file->private_data;
1034                 if (cifsFile->srch_inf.endOfSearch) {
1035                         if (cifsFile->srch_inf.emptyDir) {
1036                                 cFYI(1, ("End of search, empty dir"));
1037                                 rc = 0;
1038                                 break;
1039                         }
1040                 } /* else {
1041                         cifsFile->invalidHandle = true;
1042                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1043                 }
1044                 kfree(cifsFile->search_resume_name);
1045                 cifsFile->search_resume_name = NULL; */
1046
1047                 rc = find_cifs_entry(xid, pTcon, file,
1048                                 &current_entry, &num_to_fill);
1049                 if (rc) {
1050                         cFYI(1, ("fce error %d", rc));
1051                         goto rddir2_exit;
1052                 } else if (current_entry != NULL) {
1053                         cFYI(1, ("entry %lld found", file->f_pos));
1054                 } else {
1055                         cFYI(1, ("could not find entry"));
1056                         goto rddir2_exit;
1057                 }
1058                 cFYI(1, ("loop through %d times filling dir for net buf %p",
1059                         num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1060                 max_len = smbCalcSize((struct smb_hdr *)
1061                                 cifsFile->srch_inf.ntwrk_buf_start);
1062                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1063
1064                 /* To be safe - for UCS to UTF-8 with strings loaded
1065                 with the rare long characters alloc more to account for
1066                 such multibyte target UTF-8 characters. cifs_unicode.c,
1067                 which actually does the conversion, has the same limit */
1068                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1069                 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1070                         if (current_entry == NULL) {
1071                                 /* evaluate whether this case is an error */
1072                                 cERROR(1, ("past SMB end,  num to fill %d i %d",
1073                                           num_to_fill, i));
1074                                 break;
1075                         }
1076                         /* if buggy server returns . and .. late do
1077                         we want to check for that here? */
1078                         rc = cifs_filldir(current_entry, file,
1079                                         filldir, direntry, tmp_buf, max_len);
1080                         if (rc == -EOVERFLOW) {
1081                                 rc = 0;
1082                                 break;
1083                         }
1084
1085                         file->f_pos++;
1086                         if (file->f_pos ==
1087                                 cifsFile->srch_inf.index_of_last_entry) {
1088                                 cFYI(1, ("last entry in buf at pos %lld %s",
1089                                         file->f_pos, tmp_buf));
1090                                 cifs_save_resume_key(current_entry, cifsFile);
1091                                 break;
1092                         } else
1093                                 current_entry =
1094                                         nxt_dir_entry(current_entry, end_of_smb,
1095                                                 cifsFile->srch_inf.info_level);
1096                 }
1097                 kfree(tmp_buf);
1098                 break;
1099         } /* end switch */
1100
1101 rddir2_exit:
1102         FreeXid(xid);
1103         return rc;
1104 }