Pileus Git - ~andy/linux/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 /*
  35  * To be safe - for UCS to UTF-8 with strings loaded with the rare long
  36  * characters alloc more to account for such multibyte target UTF-8
  37  * characters.
  38  */
  39 #define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
  40
  41 #ifdef CONFIG_CIFS_DEBUG2
  42 static void dump_cifs_file_struct(struct file *file, char *label)
  43 {
  44         struct cifsFileInfo *cf;
  45
  46         if (file) {
  47                 cf = file->private_data;
  48                 if (cf == NULL) {
  49                         cFYI(1, ("empty cifs private file data"));
  50                         return;
  51                 }
  52                 if (cf->invalidHandle)
  53                         cFYI(1, ("invalid handle"));
  54                 if (cf->srch_inf.endOfSearch)
  55                         cFYI(1, ("end of search"));
  56                 if (cf->srch_inf.emptyDir)
  57                         cFYI(1, ("empty dir"));
  58         }
  59 }
  60 #else
  61 static inline void dump_cifs_file_struct(struct file *file, char *label)
  62 {
  63 }
  64 #endif /* DEBUG2 */
  65
  66 /* Returns 1 if new inode created, 2 if both dentry and inode were */
  67 /* Might check in the future if inode number changed so we can rehash inode */
  68 static int
  69 construct_dentry(struct qstr *qstring, struct file *file,
  70                  struct inode **ptmp_inode, struct dentry **pnew_dentry,
  71                  __u64 *inum)
  72 {
  73         struct dentry *tmp_dentry = NULL;
  74         struct super_block *sb = file->f_path.dentry->d_sb;
  75         int rc = 0;
  76
  77         cFYI(1, ("For %s", qstring->name));
  78
  79         qstring->hash = full_name_hash(qstring->name, qstring->len);
  80         tmp_dentry = d_lookup(file->f_path.dentry, qstring);
  81         if (tmp_dentry) {
  82                 /* BB: overwrite old name? i.e. tmp_dentry->d_name and
  83                  * tmp_dentry->d_name.len??
  84                  */
  85                 cFYI(0, ("existing dentry with inode 0x%p",
  86                          tmp_dentry->d_inode));
  87                 *ptmp_inode = tmp_dentry->d_inode;
  88                 if (*ptmp_inode == NULL) {
  89                         *ptmp_inode = cifs_new_inode(sb, inum);
  90                         if (*ptmp_inode == NULL)
  91                                 return rc;
  92                         rc = 1;
  93                 }
  94         } else {
  95                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
  96                 if (tmp_dentry == NULL) {
  97                         cERROR(1, ("Failed allocating dentry"));
  98                         *ptmp_inode = NULL;
  99                         return rc;
 100                 }
 101
 102                 if (CIFS_SB(sb)->tcon->nocase)
 103                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
 104                 else
 105                         tmp_dentry->d_op = &cifs_dentry_ops;
 106
 107                 *ptmp_inode = cifs_new_inode(sb, inum);
 108                 if (*ptmp_inode == NULL)
 109                         return rc;
 110                 rc = 2;
 111         }
 112
 113         tmp_dentry->d_time = jiffies;
 114         *pnew_dentry = tmp_dentry;
 115         return rc;
 116 }
 117
 118 static void AdjustForTZ(struct cifsTconInfo *tcon, struct inode *inode)
 119 {
 120         if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
 121                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
 122                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
 123                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
 124         }
 125         return;
 126 }
 127
 128
 129 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
 130                           char *buf, unsigned int *pobject_type, int isNewInode)
 131 {
 132         loff_t local_size;
 133         struct timespec local_mtime;
 134
 135         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 136         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 137         __u32 attr;
 138         __u64 allocation_size;
 139         __u64 end_of_file;
 140         umode_t default_mode;
 141
 142         /* save mtime and size */
 143         local_mtime = tmp_inode->i_mtime;
 144         local_size  = tmp_inode->i_size;
 145
 146         if (new_buf_type) {
 147                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
 148
 149                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 150                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 151                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 152                 tmp_inode->i_atime =
 153                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 154                 tmp_inode->i_mtime =
 155                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 156                 tmp_inode->i_ctime =
 157                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 158         } else { /* legacy, OS2 and DOS style */
 159 /*              struct timespec ts;*/
 160                 FIND_FILE_STANDARD_INFO *pfindData =
 161                         (FIND_FILE_STANDARD_INFO *)buf;
 162
 163                 tmp_inode->i_mtime = cnvrtDosUnixTm(
 164                                 le16_to_cpu(pfindData->LastWriteDate),
 165                                 le16_to_cpu(pfindData->LastWriteTime));
 166                 tmp_inode->i_atime = cnvrtDosUnixTm(
 167                                 le16_to_cpu(pfindData->LastAccessDate),
 168                                 le16_to_cpu(pfindData->LastAccessTime));
 169                 tmp_inode->i_ctime = cnvrtDosUnixTm(
 170                                 le16_to_cpu(pfindData->LastWriteDate),
 171                                 le16_to_cpu(pfindData->LastWriteTime));
 172                 AdjustForTZ(cifs_sb->tcon, tmp_inode);
 173                 attr = le16_to_cpu(pfindData->Attributes);
 174                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
 175                 end_of_file = le32_to_cpu(pfindData->DataSize);
 176         }
 177
 178         /* Linux can not store file creation time unfortunately so ignore it */
 179
 180         cifsInfo->cifsAttrs = attr;
 181 #ifdef CONFIG_CIFS_EXPERIMENTAL
 182         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 183                 /* get more accurate mode via ACL - so force inode refresh */
 184                 cifsInfo->time = 0;
 185         } else
 186 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 187                 cifsInfo->time = jiffies;
 188
 189         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 190         /* 2767 perms - indicate mandatory locking */
 191                 /* BB fill in uid and gid here? with help from winbind?
 192                    or retrieve from NTFS stream extended attribute */
 193         if (atomic_read(&cifsInfo->inUse) == 0) {
 194                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 195                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 196         }
 197
 198         if (attr & ATTR_DIRECTORY)
 199                 default_mode = cifs_sb->mnt_dir_mode;
 200         else
 201                 default_mode = cifs_sb->mnt_file_mode;
 202
 203         /* set initial permissions */
 204         if ((atomic_read(&cifsInfo->inUse) == 0) ||
 205             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
 206                 tmp_inode->i_mode = default_mode;
 207         else {
 208                 /* just reenable write bits if !ATTR_READONLY */
 209                 if ((tmp_inode->i_mode & S_IWUGO) == 0 &&
 210                     (attr & ATTR_READONLY) == 0)
 211                         tmp_inode->i_mode |= (S_IWUGO & default_mode);
 212
 213                 tmp_inode->i_mode &= ~S_IFMT;
 214         }
 215
 216         /* clear write bits if ATTR_READONLY is set */
 217         if (attr & ATTR_READONLY)
 218                 tmp_inode->i_mode &= ~S_IWUGO;
 219
 220         /* set inode type */
 221         if ((attr & ATTR_SYSTEM) &&
 222             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
 223                 if (end_of_file == 0)  {
 224                         tmp_inode->i_mode |= S_IFIFO;
 225                         *pobject_type = DT_FIFO;
 226                 } else {
 227                         /*
 228                          * trying to get the type can be slow, so just call
 229                          * this a regular file for now, and mark for reval
 230                          */
 231                         tmp_inode->i_mode |= S_IFREG;
 232                         *pobject_type = DT_REG;
 233                         cifsInfo->time = 0;
 234                 }
 235         } else {
 236                 if (attr & ATTR_DIRECTORY) {
 237                         tmp_inode->i_mode |= S_IFDIR;
 238                         *pobject_type = DT_DIR;
 239                 } else {
 240                         tmp_inode->i_mode |= S_IFREG;
 241                         *pobject_type = DT_REG;
 242                 }
 243         }
 244
 245         /* can not fill in nlink here as in qpathinfo version and Unx search */
 246         if (atomic_read(&cifsInfo->inUse) == 0)
 247                 atomic_set(&cifsInfo->inUse, 1);
 248
 249         cifsInfo->server_eof = end_of_file;
 250         spin_lock(&tmp_inode->i_lock);
 251         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 252                 /* can not safely change the file size here if the
 253                 client is writing to it due to potential races */
 254                 i_size_write(tmp_inode, end_of_file);
 255
 256         /* 512 bytes (2**9) is the fake blocksize that must be used */
 257         /* for this calculation, even though the reported blocksize is larger */
 258                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 259         }
 260         spin_unlock(&tmp_inode->i_lock);
 261
 262         if (allocation_size < end_of_file)
 263                 cFYI(1, ("May be sparse file, allocation less than file size"));
 264         cFYI(1, ("File Size %ld and blocks %llu",
 265                 (unsigned long)tmp_inode->i_size,
 266                 (unsigned long long)tmp_inode->i_blocks));
 267         if (S_ISREG(tmp_inode->i_mode)) {
 268                 cFYI(1, ("File inode"));
 269                 tmp_inode->i_op = &cifs_file_inode_ops;
 270                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 271                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 272                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 273                         else
 274                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 275                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 276                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 277                 else
 278                         tmp_inode->i_fop = &cifs_file_ops;
 279
 280                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 281                    (cifs_sb->tcon->ses->server->maxBuf <
 282                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 283                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 284                 else
 285                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 286
 287                 if (isNewInode)
 288                         return; /* No sense invalidating pages for new inode
 289                                    since have not started caching readahead file
 290                                    data yet */
 291
 292                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 293                         (local_size == tmp_inode->i_size)) {
 294                         cFYI(1, ("inode exists but unchanged"));
 295                 } else {
 296                         /* file may have changed on server */
 297                         cFYI(1, ("invalidate inode, readdir detected change"));
 298                         invalidate_remote_inode(tmp_inode);
 299                 }
 300         } else if (S_ISDIR(tmp_inode->i_mode)) {
 301                 cFYI(1, ("Directory inode"));
 302                 tmp_inode->i_op = &cifs_dir_inode_ops;
 303                 tmp_inode->i_fop = &cifs_dir_ops;
 304         } else if (S_ISLNK(tmp_inode->i_mode)) {
 305                 cFYI(1, ("Symbolic Link inode"));
 306                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 307         } else {
 308                 cFYI(1, ("Init special inode"));
 309                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 310                                    tmp_inode->i_rdev);
 311         }
 312 }
 313
 314 static void unix_fill_in_inode(struct inode *tmp_inode,
 315         FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
 316 {
 317         loff_t local_size;
 318         struct timespec local_mtime;
 319
 320         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 321         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 322
 323         __u32 type = le32_to_cpu(pfindData->Type);
 324         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 325         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 326         cifsInfo->time = jiffies;
 327         atomic_inc(&cifsInfo->inUse);
 328
 329         /* save mtime and size */
 330         local_mtime = tmp_inode->i_mtime;
 331         local_size  = tmp_inode->i_size;
 332
 333         tmp_inode->i_atime =
 334             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 335         tmp_inode->i_mtime =
 336             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 337         tmp_inode->i_ctime =
 338             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 339
 340         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 341         /* since we set the inode type below we need to mask off type
 342            to avoid strange results if bits above were corrupt */
 343         tmp_inode->i_mode &= ~S_IFMT;
 344         if (type == UNIX_FILE) {
 345                 *pobject_type = DT_REG;
 346                 tmp_inode->i_mode |= S_IFREG;
 347         } else if (type == UNIX_SYMLINK) {
 348                 *pobject_type = DT_LNK;
 349                 tmp_inode->i_mode |= S_IFLNK;
 350         } else if (type == UNIX_DIR) {
 351                 *pobject_type = DT_DIR;
 352                 tmp_inode->i_mode |= S_IFDIR;
 353         } else if (type == UNIX_CHARDEV) {
 354                 *pobject_type = DT_CHR;
 355                 tmp_inode->i_mode |= S_IFCHR;
 356                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 357                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 358         } else if (type == UNIX_BLOCKDEV) {
 359                 *pobject_type = DT_BLK;
 360                 tmp_inode->i_mode |= S_IFBLK;
 361                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 362                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 363         } else if (type == UNIX_FIFO) {
 364                 *pobject_type = DT_FIFO;
 365                 tmp_inode->i_mode |= S_IFIFO;
 366         } else if (type == UNIX_SOCKET) {
 367                 *pobject_type = DT_SOCK;
 368                 tmp_inode->i_mode |= S_IFSOCK;
 369         } else {
 370                 /* safest to just call it a file */
 371                 *pobject_type = DT_REG;
 372                 tmp_inode->i_mode |= S_IFREG;
 373                 cFYI(1, ("unknown inode type %d", type));
 374         }
 375
 376         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 377                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 378         else
 379                 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 380         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 381                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 382         else
 383                 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 384         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 385
 386         cifsInfo->server_eof = end_of_file;
 387         spin_lock(&tmp_inode->i_lock);
 388         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 389                 /* can not safely change the file size here if the
 390                 client is writing to it due to potential races */
 391                 i_size_write(tmp_inode, end_of_file);
 392
 393         /* 512 bytes (2**9) is the fake blocksize that must be used */
 394         /* for this calculation, not the real blocksize */
 395                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 396         }
 397         spin_unlock(&tmp_inode->i_lock);
 398
 399         if (S_ISREG(tmp_inode->i_mode)) {
 400                 cFYI(1, ("File inode"));
 401                 tmp_inode->i_op = &cifs_file_inode_ops;
 402
 403                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 404                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 405                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 406                         else
 407                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 408                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 409                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 410                 else
 411                         tmp_inode->i_fop = &cifs_file_ops;
 412
 413                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 414                    (cifs_sb->tcon->ses->server->maxBuf <
 415                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 416                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 417                 else
 418                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 419
 420                 if (isNewInode)
 421                         return; /* No sense invalidating pages for new inode
 422                                    since we have not started caching readahead
 423                                    file data for it yet */
 424
 425                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 426                         (local_size == tmp_inode->i_size)) {
 427                         cFYI(1, ("inode exists but unchanged"));
 428                 } else {
 429                         /* file may have changed on server */
 430                         cFYI(1, ("invalidate inode, readdir detected change"));
 431                         invalidate_remote_inode(tmp_inode);
 432                 }
 433         } else if (S_ISDIR(tmp_inode->i_mode)) {
 434                 cFYI(1, ("Directory inode"));
 435                 tmp_inode->i_op = &cifs_dir_inode_ops;
 436                 tmp_inode->i_fop = &cifs_dir_ops;
 437         } else if (S_ISLNK(tmp_inode->i_mode)) {
 438                 cFYI(1, ("Symbolic Link inode"));
 439                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 440 /* tmp_inode->i_fop = *//* do not need to set to anything */
 441         } else {
 442                 cFYI(1, ("Special inode"));
 443                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 444                                    tmp_inode->i_rdev);
 445         }
 446 }
 447
 448 static int initiate_cifs_search(const int xid, struct file *file)
 449 {
 450         int rc = 0;
 451         char *full_path;
 452         struct cifsFileInfo *cifsFile;
 453         struct cifs_sb_info *cifs_sb;
 454         struct cifsTconInfo *pTcon;
 455
 456         if (file->private_data == NULL) {
 457                 file->private_data =
 458                         kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
 459         }
 460
 461         if (file->private_data == NULL)
 462                 return -ENOMEM;
 463         cifsFile = file->private_data;
 464         cifsFile->invalidHandle = true;
 465         cifsFile->srch_inf.endOfSearch = false;
 466
 467         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 468         if (cifs_sb == NULL)
 469                 return -EINVAL;
 470
 471         pTcon = cifs_sb->tcon;
 472         if (pTcon == NULL)
 473                 return -EINVAL;
 474
 475         full_path = build_path_from_dentry(file->f_path.dentry);
 476
 477         if (full_path == NULL)
 478                 return -ENOMEM;
 479
 480         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 481
 482 ffirst_retry:
 483         /* test for Unix extensions */
 484         /* but now check for them on the share/mount not on the SMB session */
 485 /*      if (pTcon->ses->capabilities & CAP_UNIX) { */
 486         if (pTcon->unix_ext)
 487                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 488         else if ((pTcon->ses->capabilities &
 489                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 490                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 491         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 492                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 493         } else /* not srvinos - BB fixme add check for backlevel? */ {
 494                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 495         }
 496
 497         rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
 498                 &cifsFile->netfid, &cifsFile->srch_inf,
 499                 cifs_sb->mnt_cifs_flags &
 500                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 501         if (rc == 0)
 502                 cifsFile->invalidHandle = false;
 503         if ((rc == -EOPNOTSUPP) &&
 504                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 505                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 506                 goto ffirst_retry;
 507         }
 508         kfree(full_path);
 509         return rc;
 510 }
 511
 512 /* return length of unicode string in bytes */
 513 static int cifs_unicode_bytelen(char *str)
 514 {
 515         int len;
 516         __le16 *ustr = (__le16 *)str;
 517
 518         for (len = 0; len <= PATH_MAX; len++) {
 519                 if (ustr[len] == 0)
 520                         return len << 1;
 521         }
 522         cFYI(1, ("Unicode string longer than PATH_MAX found"));
 523         return len << 1;
 524 }
 525
 526 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 527 {
 528         char *new_entry;
 529         FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 530
 531         if (level == SMB_FIND_FILE_INFO_STANDARD) {
 532                 FIND_FILE_STANDARD_INFO *pfData;
 533                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 534
 535                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 536                                 pfData->FileNameLength;
 537         } else
 538                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 539         cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
 540         /* validate that new_entry is not past end of SMB */
 541         if (new_entry >= end_of_smb) {
 542                 cERROR(1,
 543                       ("search entry %p began after end of SMB %p old entry %p",
 544                         new_entry, end_of_smb, old_entry));
 545                 return NULL;
 546         } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
 547                     (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
 548                   || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 549                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 550                 cERROR(1, ("search entry %p extends after end of SMB %p",
 551                         new_entry, end_of_smb));
 552                 return NULL;
 553         } else
 554                 return new_entry;
 555
 556 }
 557
 558 #define UNICODE_DOT cpu_to_le16(0x2e)
 559
 560 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 561 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 562 {
 563         int rc = 0;
 564         char *filename = NULL;
 565         int len = 0;
 566
 567         if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 568                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
 569                 filename = &pFindData->FileName[0];
 570                 if (cfile->srch_inf.unicode) {
 571                         len = cifs_unicode_bytelen(filename);
 572                 } else {
 573                         /* BB should we make this strnlen of PATH_MAX? */
 574                         len = strnlen(filename, 5);
 575                 }
 576         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 577                 FILE_DIRECTORY_INFO *pFindData =
 578                         (FILE_DIRECTORY_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_FULL_DIRECTORY_INFO) {
 583                 FILE_FULL_DIRECTORY_INFO *pFindData =
 584                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 585                 filename = &pFindData->FileName[0];
 586                 len = le32_to_cpu(pFindData->FileNameLength);
 587         } else if (cfile->srch_inf.info_level ==
 588                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 589                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 590                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 591                 filename = &pFindData->FileName[0];
 592                 len = le32_to_cpu(pFindData->FileNameLength);
 593         } else if (cfile->srch_inf.info_level ==
 594                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 595                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 596                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 597                 filename = &pFindData->FileName[0];
 598                 len = le32_to_cpu(pFindData->FileNameLength);
 599         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 600                 FIND_FILE_STANDARD_INFO *pFindData =
 601                         (FIND_FILE_STANDARD_INFO *)current_entry;
 602                 filename = &pFindData->FileName[0];
 603                 len = pFindData->FileNameLength;
 604         } else {
 605                 cFYI(1, ("Unknown findfirst level %d",
 606                          cfile->srch_inf.info_level));
 607         }
 608
 609         if (filename) {
 610                 if (cfile->srch_inf.unicode) {
 611                         __le16 *ufilename = (__le16 *)filename;
 612                         if (len == 2) {
 613                                 /* check for . */
 614                                 if (ufilename[0] == UNICODE_DOT)
 615                                         rc = 1;
 616                         } else if (len == 4) {
 617                                 /* check for .. */
 618                                 if ((ufilename[0] == UNICODE_DOT)
 619                                    && (ufilename[1] == UNICODE_DOT))
 620                                         rc = 2;
 621                         }
 622                 } else /* ASCII */ {
 623                         if (len == 1) {
 624                                 if (filename[0] == '.')
 625                                         rc = 1;
 626                         } else if (len == 2) {
 627                                 if ((filename[0] == '.') && (filename[1] == '.'))
 628                                         rc = 2;
 629                         }
 630                 }
 631         }
 632
 633         return rc;
 634 }
 635
 636 /* Check if directory that we are searching has changed so we can decide
 637    whether we can use the cached search results from the previous search */
 638 static int is_dir_changed(struct file *file)
 639 {
 640         struct inode *inode = file->f_path.dentry->d_inode;
 641         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
 642
 643         if (cifsInfo->time == 0)
 644                 return 1; /* directory was changed, perhaps due to unlink */
 645         else
 646                 return 0;
 647
 648 }
 649
 650 static int cifs_save_resume_key(const char *current_entry,
 651         struct cifsFileInfo *cifsFile)
 652 {
 653         int rc = 0;
 654         unsigned int len = 0;
 655         __u16 level;
 656         char *filename;
 657
 658         if ((cifsFile == NULL) || (current_entry == NULL))
 659                 return -EINVAL;
 660
 661         level = cifsFile->srch_inf.info_level;
 662
 663         if (level == SMB_FIND_FILE_UNIX) {
 664                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
 665
 666                 filename = &pFindData->FileName[0];
 667                 if (cifsFile->srch_inf.unicode) {
 668                         len = cifs_unicode_bytelen(filename);
 669                 } else {
 670                         /* BB should we make this strnlen of PATH_MAX? */
 671                         len = strnlen(filename, PATH_MAX);
 672                 }
 673                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 674         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
 675                 FILE_DIRECTORY_INFO *pFindData =
 676                         (FILE_DIRECTORY_INFO *)current_entry;
 677                 filename = &pFindData->FileName[0];
 678                 len = le32_to_cpu(pFindData->FileNameLength);
 679                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 680         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 681                 FILE_FULL_DIRECTORY_INFO *pFindData =
 682                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 683                 filename = &pFindData->FileName[0];
 684                 len = le32_to_cpu(pFindData->FileNameLength);
 685                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 686         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 687                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 688                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 689                 filename = &pFindData->FileName[0];
 690                 len = le32_to_cpu(pFindData->FileNameLength);
 691                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 692         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 693                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 694                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 695                 filename = &pFindData->FileName[0];
 696                 len = le32_to_cpu(pFindData->FileNameLength);
 697                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 698         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
 699                 FIND_FILE_STANDARD_INFO *pFindData =
 700                         (FIND_FILE_STANDARD_INFO *)current_entry;
 701                 filename = &pFindData->FileName[0];
 702                 /* one byte length, no name conversion */
 703                 len = (unsigned int)pFindData->FileNameLength;
 704                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 705         } else {
 706                 cFYI(1, ("Unknown findfirst level %d", level));
 707                 return -EINVAL;
 708         }
 709         cifsFile->srch_inf.resume_name_len = len;
 710         cifsFile->srch_inf.presume_name = filename;
 711         return rc;
 712 }
 713
 714 /* find the corresponding entry in the search */
 715 /* Note that the SMB server returns search entries for . and .. which
 716    complicates logic here if we choose to parse for them and we do not
 717    assume that they are located in the findfirst return buffer.*/
 718 /* We start counting in the buffer with entry 2 and increment for every
 719    entry (do not increment for . or .. entry) */
 720 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 721         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 722 {
 723         int rc = 0;
 724         int pos_in_buf = 0;
 725         loff_t first_entry_in_buffer;
 726         loff_t index_to_find = file->f_pos;
 727         struct cifsFileInfo *cifsFile = file->private_data;
 728         /* check if index in the buffer */
 729
 730         if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 731            (num_to_ret == NULL))
 732                 return -ENOENT;
 733
 734         *ppCurrentEntry = NULL;
 735         first_entry_in_buffer =
 736                 cifsFile->srch_inf.index_of_last_entry -
 737                         cifsFile->srch_inf.entries_in_buffer;
 738
 739         /* if first entry in buf is zero then is first buffer
 740         in search response data which means it is likely . and ..
 741         will be in this buffer, although some servers do not return
 742         . and .. for the root of a drive and for those we need
 743         to start two entries earlier */
 744
 745         dump_cifs_file_struct(file, "In fce ");
 746         if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 747              is_dir_changed(file)) ||
 748            (index_to_find < first_entry_in_buffer)) {
 749                 /* close and restart search */
 750                 cFYI(1, ("search backing up - close and restart search"));
 751                 write_lock(&GlobalSMBSeslock);
 752                 if (!cifsFile->srch_inf.endOfSearch &&
 753                     !cifsFile->invalidHandle) {
 754                         cifsFile->invalidHandle = true;
 755                         write_unlock(&GlobalSMBSeslock);
 756                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 757                 } else
 758                         write_unlock(&GlobalSMBSeslock);
 759                 if (cifsFile->srch_inf.ntwrk_buf_start) {
 760                         cFYI(1, ("freeing SMB ff cache buf on search rewind"));
 761                         if (cifsFile->srch_inf.smallBuf)
 762                                 cifs_small_buf_release(cifsFile->srch_inf.
 763                                                 ntwrk_buf_start);
 764                         else
 765                                 cifs_buf_release(cifsFile->srch_inf.
 766                                                 ntwrk_buf_start);
 767                         cifsFile->srch_inf.ntwrk_buf_start = NULL;
 768                 }
 769                 rc = initiate_cifs_search(xid, file);
 770                 if (rc) {
 771                         cFYI(1, ("error %d reinitiating a search on rewind",
 772                                  rc));
 773                         return rc;
 774                 }
 775                 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
 776         }
 777
 778         while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 779               (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
 780                 cFYI(1, ("calling findnext2"));
 781                 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
 782                                   &cifsFile->srch_inf);
 783                 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
 784                 if (rc)
 785                         return -ENOENT;
 786         }
 787         if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 788                 /* we found the buffer that contains the entry */
 789                 /* scan and find it */
 790                 int i;
 791                 char *current_entry;
 792                 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 793                         smbCalcSize((struct smb_hdr *)
 794                                 cifsFile->srch_inf.ntwrk_buf_start);
 795
 796                 current_entry = cifsFile->srch_inf.srch_entries_start;
 797                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 798                                         - cifsFile->srch_inf.entries_in_buffer;
 799                 pos_in_buf = index_to_find - first_entry_in_buffer;
 800                 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
 801
 802                 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
 803                         /* go entry by entry figuring out which is first */
 804                         current_entry = nxt_dir_entry(current_entry, end_of_smb,
 805                                                 cifsFile->srch_inf.info_level);
 806                 }
 807                 if ((current_entry == NULL) && (i < pos_in_buf)) {
 808                         /* BB fixme - check if we should flag this error */
 809                         cERROR(1, ("reached end of buf searching for pos in buf"
 810                           " %d index to find %lld rc %d",
 811                           pos_in_buf, index_to_find, rc));
 812                 }
 813                 rc = 0;
 814                 *ppCurrentEntry = current_entry;
 815         } else {
 816                 cFYI(1, ("index not in buffer - could not findnext into it"));
 817                 return 0;
 818         }
 819
 820         if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 821                 cFYI(1, ("can not return entries pos_in_buf beyond last"));
 822                 *num_to_ret = 0;
 823         } else
 824                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 825
 826         return rc;
 827 }
 828
 829 /* inode num, inode type and filename returned */
 830 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 831         char *current_entry, __u16 level, unsigned int unicode,
 832         struct cifs_sb_info *cifs_sb, int max_len, __u64 *pinum)
 833 {
 834         int rc = 0;
 835         unsigned int len = 0;
 836         char *filename;
 837         struct nls_table *nlt = cifs_sb->local_nls;
 838
 839         *pinum = 0;
 840
 841         if (level == SMB_FIND_FILE_UNIX) {
 842                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
 843
 844                 filename = &pFindData->FileName[0];
 845                 if (unicode) {
 846                         len = cifs_unicode_bytelen(filename);
 847                 } else {
 848                         /* BB should we make this strnlen of PATH_MAX? */
 849                         len = strnlen(filename, PATH_MAX);
 850                 }
 851
 852                 *pinum = le64_to_cpu(pFindData->UniqueId);
 853         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
 854                 FILE_DIRECTORY_INFO *pFindData =
 855                         (FILE_DIRECTORY_INFO *)current_entry;
 856                 filename = &pFindData->FileName[0];
 857                 len = le32_to_cpu(pFindData->FileNameLength);
 858         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 859                 FILE_FULL_DIRECTORY_INFO *pFindData =
 860                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 861                 filename = &pFindData->FileName[0];
 862                 len = le32_to_cpu(pFindData->FileNameLength);
 863         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 864                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 865                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 866                 filename = &pFindData->FileName[0];
 867                 len = le32_to_cpu(pFindData->FileNameLength);
 868                 *pinum = le64_to_cpu(pFindData->UniqueId);
 869         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 870                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 871                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 872                 filename = &pFindData->FileName[0];
 873                 len = le32_to_cpu(pFindData->FileNameLength);
 874         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
 875                 FIND_FILE_STANDARD_INFO *pFindData =
 876                         (FIND_FILE_STANDARD_INFO *)current_entry;
 877                 filename = &pFindData->FileName[0];
 878                 /* one byte length, no name conversion */
 879                 len = (unsigned int)pFindData->FileNameLength;
 880         } else {
 881                 cFYI(1, ("Unknown findfirst level %d", level));
 882                 return -EINVAL;
 883         }
 884
 885         if (len > max_len) {
 886                 cERROR(1, ("bad search response length %d past smb end", len));
 887                 return -EINVAL;
 888         }
 889
 890         if (unicode) {
 891                 pqst->len = cifs_from_ucs2((char *) pqst->name,
 892                                            (__le16 *) filename,
 893                                            UNICODE_NAME_MAX, max_len, nlt,
 894                                            cifs_sb->mnt_cifs_flags &
 895                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 896         } else {
 897                 pqst->name = filename;
 898                 pqst->len = len;
 899         }
 900         pqst->hash = full_name_hash(pqst->name, pqst->len);
 901 /*      cFYI(1, ("filldir on %s",pqst->name));  */
 902         return rc;
 903 }
 904
 905 static int cifs_filldir(char *pfindEntry, struct file *file,
 906         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 907 {
 908         int rc = 0;
 909         struct qstr qstring;
 910         struct cifsFileInfo *pCifsF;
 911         unsigned int obj_type;
 912         __u64  inum;
 913         struct cifs_sb_info *cifs_sb;
 914         struct inode *tmp_inode;
 915         struct dentry *tmp_dentry;
 916
 917         /* get filename and len into qstring */
 918         /* get dentry */
 919         /* decide whether to create and populate ionde */
 920         if ((direntry == NULL) || (file == NULL))
 921                 return -EINVAL;
 922
 923         pCifsF = file->private_data;
 924
 925         if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 926                 return -ENOENT;
 927
 928         rc = cifs_entry_is_dot(pfindEntry, pCifsF);
 929         /* skip . and .. since we added them first */
 930         if (rc != 0)
 931                 return 0;
 932
 933         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 934
 935         qstring.name = scratch_buf;
 936         rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
 937                         pCifsF->srch_inf.info_level,
 938                         pCifsF->srch_inf.unicode, cifs_sb,
 939                         max_len,
 940                         &inum /* returned */);
 941
 942         if (rc)
 943                 return rc;
 944
 945         /* only these two infolevels return valid inode numbers */
 946         if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX ||
 947             pCifsF->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO)
 948                 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
 949                                         &inum);
 950         else
 951                 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
 952                                         NULL);
 953
 954         if ((tmp_inode == NULL) || (tmp_dentry == NULL))
 955                 return -ENOMEM;
 956
 957         /* we pass in rc below, indicating whether it is a new inode,
 958            so we can figure out whether to invalidate the inode cached
 959            data if the file has changed */
 960         if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 961                 unix_fill_in_inode(tmp_inode,
 962                                    (FILE_UNIX_INFO *)pfindEntry,
 963                                    &obj_type, rc);
 964         else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
 965                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
 966                                 pfindEntry, &obj_type, rc);
 967         else
 968                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 969
 970         if (rc) /* new inode - needs to be tied to dentry */ {
 971                 d_instantiate(tmp_dentry, tmp_inode);
 972                 if (rc == 2)
 973                         d_rehash(tmp_dentry);
 974         }
 975
 976
 977         rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
 978                      tmp_inode->i_ino, obj_type);
 979         if (rc) {
 980                 cFYI(1, ("filldir rc = %d", rc));
 981                 /* we can not return filldir errors to the caller
 982                 since they are "normal" when the stat blocksize
 983                 is too small - we return remapped error instead */
 984                 rc = -EOVERFLOW;
 985         }
 986
 987         dput(tmp_dentry);
 988         return rc;
 989 }
 990
 991
 992 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 993 {
 994         int rc = 0;
 995         int xid, i;
 996         struct cifs_sb_info *cifs_sb;
 997         struct cifsTconInfo *pTcon;
 998         struct cifsFileInfo *cifsFile = NULL;
 999         char *current_entry;
1000         int num_to_fill = 0;
1001         char *tmp_buf = NULL;
1002         char *end_of_smb;
1003         int max_len;
1004
1005         xid = GetXid();
1006
1007         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1008         pTcon = cifs_sb->tcon;
1009         if (pTcon == NULL)
1010                 return -EINVAL;
1011
1012         switch ((int) file->f_pos) {
1013         case 0:
1014                 if (filldir(direntry, ".", 1, file->f_pos,
1015                      file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1016                         cERROR(1, ("Filldir for current dir failed"));
1017                         rc = -ENOMEM;
1018                         break;
1019                 }
1020                 file->f_pos++;
1021         case 1:
1022                 if (filldir(direntry, "..", 2, file->f_pos,
1023                      file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1024                         cERROR(1, ("Filldir for parent dir failed"));
1025                         rc = -ENOMEM;
1026                         break;
1027                 }
1028                 file->f_pos++;
1029         default:
1030                 /* 1) If search is active,
1031                         is in current search buffer?
1032                         if it before then restart search
1033                         if after then keep searching till find it */
1034
1035                 if (file->private_data == NULL) {
1036                         rc = initiate_cifs_search(xid, file);
1037                         cFYI(1, ("initiate cifs search rc %d", rc));
1038                         if (rc) {
1039                                 FreeXid(xid);
1040                                 return rc;
1041                         }
1042                 }
1043                 if (file->private_data == NULL) {
1044                         rc = -EINVAL;
1045                         FreeXid(xid);
1046                         return rc;
1047                 }
1048                 cifsFile = file->private_data;
1049                 if (cifsFile->srch_inf.endOfSearch) {
1050                         if (cifsFile->srch_inf.emptyDir) {
1051                                 cFYI(1, ("End of search, empty dir"));
1052                                 rc = 0;
1053                                 break;
1054                         }
1055                 } /* else {
1056                         cifsFile->invalidHandle = true;
1057                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1058                 } */
1059
1060                 rc = find_cifs_entry(xid, pTcon, file,
1061                                 &current_entry, &num_to_fill);
1062                 if (rc) {
1063                         cFYI(1, ("fce error %d", rc));
1064                         goto rddir2_exit;
1065                 } else if (current_entry != NULL) {
1066                         cFYI(1, ("entry %lld found", file->f_pos));
1067                 } else {
1068                         cFYI(1, ("could not find entry"));
1069                         goto rddir2_exit;
1070                 }
1071                 cFYI(1, ("loop through %d times filling dir for net buf %p",
1072                         num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1073                 max_len = smbCalcSize((struct smb_hdr *)
1074                                 cifsFile->srch_inf.ntwrk_buf_start);
1075                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1076
1077                 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
1078                 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1079                         if (current_entry == NULL) {
1080                                 /* evaluate whether this case is an error */
1081                                 cERROR(1, ("past SMB end,  num to fill %d i %d",
1082                                           num_to_fill, i));
1083                                 break;
1084                         }
1085                         /* if buggy server returns . and .. late do
1086                         we want to check for that here? */
1087                         rc = cifs_filldir(current_entry, file,
1088                                         filldir, direntry, tmp_buf, max_len);
1089                         if (rc == -EOVERFLOW) {
1090                                 rc = 0;
1091                                 break;
1092                         }
1093
1094                         file->f_pos++;
1095                         if (file->f_pos ==
1096                                 cifsFile->srch_inf.index_of_last_entry) {
1097                                 cFYI(1, ("last entry in buf at pos %lld %s",
1098                                         file->f_pos, tmp_buf));
1099                                 cifs_save_resume_key(current_entry, cifsFile);
1100                                 break;
1101                         } else
1102                                 current_entry =
1103                                         nxt_dir_entry(current_entry, end_of_smb,
1104                                                 cifsFile->srch_inf.info_level);
1105                 }
1106                 kfree(tmp_buf);
1107                 break;
1108         } /* end switch */
1109
1110 rddir2_exit:
1111         FreeXid(xid);
1112         return rc;
1113 }