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, 2005
   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/stat.h>
  25 #include <linux/smp_lock.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 /* BB fixme - add debug wrappers around this function to disable it fixme BB */
  35 /* static void dump_cifs_file_struct(struct file *file, char *label)
  36 {
  37         struct cifsFileInfo * cf;
  38
  39         if(file) {
  40                 cf = file->private_data;
  41                 if(cf == NULL) {
  42                         cFYI(1,("empty cifs private file data"));
  43                         return;
  44                 }
  45                 if(cf->invalidHandle) {
  46                         cFYI(1,("invalid handle"));
  47                 }
  48                 if(cf->srch_inf.endOfSearch) {
  49                         cFYI(1,("end of search"));
  50                 }
  51                 if(cf->srch_inf.emptyDir) {
  52                         cFYI(1,("empty dir"));
  53                 }
  54
  55         }
  56 } */
  57
  58 /* Returns one if new inode created (which therefore needs to be hashed) */
  59 /* Might check in the future if inode number changed so we can rehash inode */
  60 static int construct_dentry(struct qstr *qstring, struct file *file,
  61         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  62 {
  63         struct dentry *tmp_dentry;
  64         struct cifs_sb_info *cifs_sb;
  65         struct cifsTconInfo *pTcon;
  66         int rc = 0;
  67
  68         cFYI(1, ("For %s", qstring->name));
  69         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
  70         pTcon = cifs_sb->tcon;
  71
  72         qstring->hash = full_name_hash(qstring->name, qstring->len);
  73         tmp_dentry = d_lookup(file->f_dentry, qstring);
  74         if (tmp_dentry) {
  75                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
  76                 *ptmp_inode = tmp_dentry->d_inode;
  77 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
  78                 if(*ptmp_inode == NULL) {
  79                         *ptmp_inode = new_inode(file->f_dentry->d_sb);
  80                         if(*ptmp_inode == NULL)
  81                                 return rc;
  82                         rc = 1;
  83                         d_instantiate(tmp_dentry, *ptmp_inode);
  84                 }
  85         } else {
  86                 tmp_dentry = d_alloc(file->f_dentry, qstring);
  87                 if(tmp_dentry == NULL) {
  88                         cERROR(1,("Failed allocating dentry"));
  89                         *ptmp_inode = NULL;
  90                         return rc;
  91                 }
  92
  93                 *ptmp_inode = new_inode(file->f_dentry->d_sb);
  94                 if (pTcon->nocase)
  95                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
  96                 else
  97                         tmp_dentry->d_op = &cifs_dentry_ops;
  98                 if(*ptmp_inode == NULL)
  99                         return rc;
 100                 rc = 1;
 101                 d_instantiate(tmp_dentry, *ptmp_inode);
 102                 d_rehash(tmp_dentry);
 103         }
 104
 105         tmp_dentry->d_time = jiffies;
 106         *pnew_dentry = tmp_dentry;
 107         return rc;
 108 }
 109
 110 static void fill_in_inode(struct inode *tmp_inode,
 111         FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
 112 {
 113         loff_t local_size;
 114         struct timespec local_mtime;
 115
 116         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 117         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 118         __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 119         __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 120         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 121
 122         cifsInfo->cifsAttrs = attr;
 123         cifsInfo->time = jiffies;
 124
 125         /* save mtime and size */
 126         local_mtime = tmp_inode->i_mtime;
 127         local_size  = tmp_inode->i_size;
 128
 129         /* Linux can not store file creation time unfortunately so ignore it */
 130         tmp_inode->i_atime =
 131             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 132         tmp_inode->i_mtime =
 133             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 134         tmp_inode->i_ctime =
 135             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 136         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 137         /* 2767 perms - indicate mandatory locking */
 138                 /* BB fill in uid and gid here? with help from winbind?
 139                    or retrieve from NTFS stream extended attribute */
 140         if (atomic_read(&cifsInfo->inUse) == 0) {
 141                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 142                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 143                 /* set default mode. will override for dirs below */
 144                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 145         } else {
 146                 /* mask off the type bits since it gets set
 147                 below and we do not want to get two type
 148                 bits set */
 149                 tmp_inode->i_mode &= ~S_IFMT;
 150         }
 151
 152         if (attr & ATTR_DIRECTORY) {
 153                 *pobject_type = DT_DIR;
 154                 /* override default perms since we do not lock dirs */
 155                 if(atomic_read(&cifsInfo->inUse) == 0) {
 156                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 157                 }
 158                 tmp_inode->i_mode |= S_IFDIR;
 159         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 160                    (attr & ATTR_SYSTEM)) {
 161                 if (end_of_file == 0)  {
 162                         *pobject_type = DT_FIFO;
 163                         tmp_inode->i_mode |= S_IFIFO;
 164                 } else {
 165                         /* rather than get the type here, we mark the
 166                         inode as needing revalidate and get the real type
 167                         (blk vs chr vs. symlink) later ie in lookup */
 168                         *pobject_type = DT_REG;
 169                         tmp_inode->i_mode |= S_IFREG;
 170                         cifsInfo->time = 0;
 171                 }
 172 /* we no longer mark these because we could not follow them */
 173 /*        } else if (attr & ATTR_REPARSE) {
 174                 *pobject_type = DT_LNK;
 175                 tmp_inode->i_mode |= S_IFLNK; */
 176         } else {
 177                 *pobject_type = DT_REG;
 178                 tmp_inode->i_mode |= S_IFREG;
 179                 if (attr & ATTR_READONLY)
 180                         tmp_inode->i_mode &= ~(S_IWUGO);
 181         } /* could add code here - to validate if device or weird share type? */
 182
 183         /* can not fill in nlink here as in qpathinfo version and Unx search */
 184         if (atomic_read(&cifsInfo->inUse) == 0) {
 185                 atomic_set(&cifsInfo->inUse, 1);
 186         }
 187
 188         if (is_size_safe_to_change(cifsInfo)) {
 189                 /* can not safely change the file size here if the
 190                 client is writing to it due to potential races */
 191                 i_size_write(tmp_inode, end_of_file);
 192
 193         /* 512 bytes (2**9) is the fake blocksize that must be used */
 194         /* for this calculation, even though the reported blocksize is larger */
 195                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 196         }
 197
 198         if (allocation_size < end_of_file)
 199                 cFYI(1, ("May be sparse file, allocation less than file size"));
 200         cFYI(1, ("File Size %ld and blocks %llu and blocksize %ld",
 201                 (unsigned long)tmp_inode->i_size,
 202                 (unsigned long long)tmp_inode->i_blocks,
 203                 tmp_inode->i_blksize));
 204         if (S_ISREG(tmp_inode->i_mode)) {
 205                 cFYI(1, ("File inode"));
 206                 tmp_inode->i_op = &cifs_file_inode_ops;
 207                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 208                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 209                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 210                         else
 211                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 212
 213                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 214                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 215                 else
 216                         tmp_inode->i_fop = &cifs_file_ops;
 217
 218                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 219                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 220                    (cifs_sb->tcon->ses->server->maxBuf <
 221                         4096 + MAX_CIFS_HDR_SIZE))
 222                         tmp_inode->i_data.a_ops->readpages = NULL;
 223                 if(isNewInode)
 224                         return; /* No sense invalidating pages for new inode
 225                                    since have not started caching readahead file
 226                                    data yet */
 227
 228                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 229                         (local_size == tmp_inode->i_size)) {
 230                         cFYI(1, ("inode exists but unchanged"));
 231                 } else {
 232                         /* file may have changed on server */
 233                         cFYI(1, ("invalidate inode, readdir detected change"));
 234                         invalidate_remote_inode(tmp_inode);
 235                 }
 236         } else if (S_ISDIR(tmp_inode->i_mode)) {
 237                 cFYI(1, ("Directory inode"));
 238                 tmp_inode->i_op = &cifs_dir_inode_ops;
 239                 tmp_inode->i_fop = &cifs_dir_ops;
 240         } else if (S_ISLNK(tmp_inode->i_mode)) {
 241                 cFYI(1, ("Symbolic Link inode"));
 242                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 243         } else {
 244                 cFYI(1, ("Init special inode"));
 245                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 246                                    tmp_inode->i_rdev);
 247         }
 248 }
 249
 250 static void unix_fill_in_inode(struct inode *tmp_inode,
 251         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 252 {
 253         loff_t local_size;
 254         struct timespec local_mtime;
 255
 256         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 257         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 258
 259         __u32 type = le32_to_cpu(pfindData->Type);
 260         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 261         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 262         cifsInfo->time = jiffies;
 263         atomic_inc(&cifsInfo->inUse);
 264
 265         /* save mtime and size */
 266         local_mtime = tmp_inode->i_mtime;
 267         local_size  = tmp_inode->i_size;
 268
 269         tmp_inode->i_atime =
 270             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 271         tmp_inode->i_mtime =
 272             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 273         tmp_inode->i_ctime =
 274             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 275
 276         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 277         /* since we set the inode type below we need to mask off type
 278            to avoid strange results if bits above were corrupt */
 279         tmp_inode->i_mode &= ~S_IFMT;
 280         if (type == UNIX_FILE) {
 281                 *pobject_type = DT_REG;
 282                 tmp_inode->i_mode |= S_IFREG;
 283         } else if (type == UNIX_SYMLINK) {
 284                 *pobject_type = DT_LNK;
 285                 tmp_inode->i_mode |= S_IFLNK;
 286         } else if (type == UNIX_DIR) {
 287                 *pobject_type = DT_DIR;
 288                 tmp_inode->i_mode |= S_IFDIR;
 289         } else if (type == UNIX_CHARDEV) {
 290                 *pobject_type = DT_CHR;
 291                 tmp_inode->i_mode |= S_IFCHR;
 292                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 293                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 294         } else if (type == UNIX_BLOCKDEV) {
 295                 *pobject_type = DT_BLK;
 296                 tmp_inode->i_mode |= S_IFBLK;
 297                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 298                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 299         } else if (type == UNIX_FIFO) {
 300                 *pobject_type = DT_FIFO;
 301                 tmp_inode->i_mode |= S_IFIFO;
 302         } else if (type == UNIX_SOCKET) {
 303                 *pobject_type = DT_SOCK;
 304                 tmp_inode->i_mode |= S_IFSOCK;
 305         } else {
 306                 /* safest to just call it a file */
 307                 *pobject_type = DT_REG;
 308                 tmp_inode->i_mode |= S_IFREG;
 309                 cFYI(1,("unknown inode type %d",type));
 310         }
 311
 312         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 313         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 314         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 315
 316         if (is_size_safe_to_change(cifsInfo)) {
 317                 /* can not safely change the file size here if the
 318                 client is writing to it due to potential races */
 319                 i_size_write(tmp_inode,end_of_file);
 320
 321         /* 512 bytes (2**9) is the fake blocksize that must be used */
 322         /* for this calculation, not the real blocksize */
 323                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 324         }
 325
 326         if (S_ISREG(tmp_inode->i_mode)) {
 327                 cFYI(1, ("File inode"));
 328                 tmp_inode->i_op = &cifs_file_inode_ops;
 329
 330                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 331                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 332                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 333                         else
 334                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 335
 336                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 337                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 338                 else
 339                         tmp_inode->i_fop = &cifs_file_ops;
 340
 341                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 342                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 343                    (cifs_sb->tcon->ses->server->maxBuf <
 344                         4096 + MAX_CIFS_HDR_SIZE))
 345                         tmp_inode->i_data.a_ops->readpages = NULL;
 346
 347                 if(isNewInode)
 348                         return; /* No sense invalidating pages for new inode since we
 349                                            have not started caching readahead file data yet */
 350
 351                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 352                         (local_size == tmp_inode->i_size)) {
 353                         cFYI(1, ("inode exists but unchanged"));
 354                 } else {
 355                         /* file may have changed on server */
 356                         cFYI(1, ("invalidate inode, readdir detected change"));
 357                         invalidate_remote_inode(tmp_inode);
 358                 }
 359         } else if (S_ISDIR(tmp_inode->i_mode)) {
 360                 cFYI(1, ("Directory inode"));
 361                 tmp_inode->i_op = &cifs_dir_inode_ops;
 362                 tmp_inode->i_fop = &cifs_dir_ops;
 363         } else if (S_ISLNK(tmp_inode->i_mode)) {
 364                 cFYI(1, ("Symbolic Link inode"));
 365                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 366 /* tmp_inode->i_fop = *//* do not need to set to anything */
 367         } else {
 368                 cFYI(1, ("Special inode"));
 369                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 370                                    tmp_inode->i_rdev);
 371         }
 372 }
 373
 374 static int initiate_cifs_search(const int xid, struct file *file)
 375 {
 376         int rc = 0;
 377         char * full_path;
 378         struct cifsFileInfo * cifsFile;
 379         struct cifs_sb_info *cifs_sb;
 380         struct cifsTconInfo *pTcon;
 381
 382         if(file->private_data == NULL) {
 383                 file->private_data =
 384                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 385         }
 386
 387         if(file->private_data == NULL) {
 388                 return -ENOMEM;
 389         } else {
 390                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 391         }
 392         cifsFile = file->private_data;
 393         cifsFile->invalidHandle = TRUE;
 394         cifsFile->srch_inf.endOfSearch = FALSE;
 395
 396         if(file->f_dentry == NULL)
 397                 return -ENOENT;
 398
 399         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 400         if(cifs_sb == NULL)
 401                 return -EINVAL;
 402
 403         pTcon = cifs_sb->tcon;
 404         if(pTcon == NULL)
 405                 return -EINVAL;
 406
 407         full_path = build_path_from_dentry(file->f_dentry);
 408
 409         if(full_path == NULL) {
 410                 return -ENOMEM;
 411         }
 412
 413         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 414
 415 ffirst_retry:
 416         /* test for Unix extensions */
 417         if (pTcon->ses->capabilities & CAP_UNIX) {
 418                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 419         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 420                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 421         } else /* not srvinos - BB fixme add check for backlevel? */ {
 422                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 423         }
 424
 425         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 426                 &cifsFile->netfid, &cifsFile->srch_inf,
 427                 cifs_sb->mnt_cifs_flags &
 428                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 429         if(rc == 0)
 430                 cifsFile->invalidHandle = FALSE;
 431         if((rc == -EOPNOTSUPP) &&
 432                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 433                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 434                 goto ffirst_retry;
 435         }
 436         kfree(full_path);
 437         return rc;
 438 }
 439
 440 /* return length of unicode string in bytes */
 441 static int cifs_unicode_bytelen(char *str)
 442 {
 443         int len;
 444         __le16 * ustr = (__le16 *)str;
 445
 446         for(len=0;len <= PATH_MAX;len++) {
 447                 if(ustr[len] == 0)
 448                         return len << 1;
 449         }
 450         cFYI(1,("Unicode string longer than PATH_MAX found"));
 451         return len << 1;
 452 }
 453
 454 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
 455 {
 456         char * new_entry;
 457         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 458
 459         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 460         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 461         /* validate that new_entry is not past end of SMB */
 462         if(new_entry >= end_of_smb) {
 463                 cERROR(1,
 464                       ("search entry %p began after end of SMB %p old entry %p",
 465                         new_entry, end_of_smb, old_entry));
 466                 return NULL;
 467         } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
 468                 cERROR(1,("search entry %p extends after end of SMB %p",
 469                         new_entry, end_of_smb));
 470                 return NULL;
 471         } else
 472                 return new_entry;
 473
 474 }
 475
 476 #define UNICODE_DOT cpu_to_le16(0x2e)
 477
 478 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 479 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 480 {
 481         int rc = 0;
 482         char * filename = NULL;
 483         int len = 0;
 484
 485         if(cfile->srch_inf.info_level == 0x202) {
 486                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 487                 filename = &pFindData->FileName[0];
 488                 if(cfile->srch_inf.unicode) {
 489                         len = cifs_unicode_bytelen(filename);
 490                 } else {
 491                         /* BB should we make this strnlen of PATH_MAX? */
 492                         len = strnlen(filename, 5);
 493                 }
 494         } else if(cfile->srch_inf.info_level == 0x101) {
 495                 FILE_DIRECTORY_INFO * pFindData =
 496                         (FILE_DIRECTORY_INFO *)current_entry;
 497                 filename = &pFindData->FileName[0];
 498                 len = le32_to_cpu(pFindData->FileNameLength);
 499         } else if(cfile->srch_inf.info_level == 0x102) {
 500                 FILE_FULL_DIRECTORY_INFO * pFindData =
 501                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 502                 filename = &pFindData->FileName[0];
 503                 len = le32_to_cpu(pFindData->FileNameLength);
 504         } else if(cfile->srch_inf.info_level == 0x105) {
 505                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 506                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 507                 filename = &pFindData->FileName[0];
 508                 len = le32_to_cpu(pFindData->FileNameLength);
 509         } else if(cfile->srch_inf.info_level == 0x104) {
 510                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 511                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 512                 filename = &pFindData->FileName[0];
 513                 len = le32_to_cpu(pFindData->FileNameLength);
 514         } else {
 515                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 516         }
 517
 518         if(filename) {
 519                 if(cfile->srch_inf.unicode) {
 520                         __le16 *ufilename = (__le16 *)filename;
 521                         if(len == 2) {
 522                                 /* check for . */
 523                                 if(ufilename[0] == UNICODE_DOT)
 524                                         rc = 1;
 525                         } else if(len == 4) {
 526                                 /* check for .. */
 527                                 if((ufilename[0] == UNICODE_DOT)
 528                                    &&(ufilename[1] == UNICODE_DOT))
 529                                         rc = 2;
 530                         }
 531                 } else /* ASCII */ {
 532                         if(len == 1) {
 533                                 if(filename[0] == '.')
 534                                         rc = 1;
 535                         } else if(len == 2) {
 536                                 if((filename[0] == '.') && (filename[1] == '.'))
 537                                         rc = 2;
 538                         }
 539                 }
 540         }
 541
 542         return rc;
 543 }
 544
 545 /* Check if directory that we are searching has changed so we can decide
 546    whether we can use the cached search results from the previous search */
 547 static int is_dir_changed(struct file * file)
 548 {
 549         struct inode * inode;
 550         struct cifsInodeInfo *cifsInfo;
 551
 552         if(file->f_dentry == NULL)
 553                 return 0;
 554
 555         inode = file->f_dentry->d_inode;
 556
 557         if(inode == NULL)
 558                 return 0;
 559
 560         cifsInfo = CIFS_I(inode);
 561
 562         if(cifsInfo->time == 0)
 563                 return 1; /* directory was changed, perhaps due to unlink */
 564         else
 565                 return 0;
 566
 567 }
 568
 569 /* find the corresponding entry in the search */
 570 /* Note that the SMB server returns search entries for . and .. which
 571    complicates logic here if we choose to parse for them and we do not
 572    assume that they are located in the findfirst return buffer.*/
 573 /* We start counting in the buffer with entry 2 and increment for every
 574    entry (do not increment for . or .. entry) */
 575 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 576         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 577 {
 578         int rc = 0;
 579         int pos_in_buf = 0;
 580         loff_t first_entry_in_buffer;
 581         loff_t index_to_find = file->f_pos;
 582         struct cifsFileInfo * cifsFile = file->private_data;
 583         /* check if index in the buffer */
 584
 585         if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 586            (num_to_ret == NULL))
 587                 return -ENOENT;
 588
 589         *ppCurrentEntry = NULL;
 590         first_entry_in_buffer =
 591                 cifsFile->srch_inf.index_of_last_entry -
 592                         cifsFile->srch_inf.entries_in_buffer;
 593
 594         /* if first entry in buf is zero then is first buffer
 595         in search response data which means it is likely . and ..
 596         will be in this buffer, although some servers do not return
 597         . and .. for the root of a drive and for those we need
 598         to start two entries earlier */
 599
 600 /*      dump_cifs_file_struct(file, "In fce ");*/
 601         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 602              is_dir_changed(file)) ||
 603            (index_to_find < first_entry_in_buffer)) {
 604                 /* close and restart search */
 605                 cFYI(1,("search backing up - close and restart search"));
 606                 cifsFile->invalidHandle = TRUE;
 607                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 608                 kfree(cifsFile->search_resume_name);
 609                 cifsFile->search_resume_name = NULL;
 610                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 611                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 612                         if(cifsFile->srch_inf.smallBuf)
 613                                 cifs_small_buf_release(cifsFile->srch_inf.
 614                                                 ntwrk_buf_start);
 615                         else
 616                                 cifs_buf_release(cifsFile->srch_inf.
 617                                                 ntwrk_buf_start);
 618                 }
 619                 rc = initiate_cifs_search(xid,file);
 620                 if(rc) {
 621                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 622                         return rc;
 623                 }
 624         }
 625
 626         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 627               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 628                 cFYI(1,("calling findnext2"));
 629                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 630                                   &cifsFile->srch_inf);
 631                 if(rc)
 632                         return -ENOENT;
 633         }
 634         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 635                 /* we found the buffer that contains the entry */
 636                 /* scan and find it */
 637                 int i;
 638                 char * current_entry;
 639                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 640                         smbCalcSize((struct smb_hdr *)
 641                                 cifsFile->srch_inf.ntwrk_buf_start);
 642
 643                 current_entry = cifsFile->srch_inf.srch_entries_start;
 644                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 645                                         - cifsFile->srch_inf.entries_in_buffer;
 646                 pos_in_buf = index_to_find - first_entry_in_buffer;
 647                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 648                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 649                         /* go entry by entry figuring out which is first */
 650                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
 651                 }
 652                 if((current_entry == NULL) && (i < pos_in_buf)) {
 653                         /* BB fixme - check if we should flag this error */
 654                         cERROR(1,("reached end of buf searching for pos in buf"
 655                           " %d index to find %lld rc %d",
 656                           pos_in_buf,index_to_find,rc));
 657                 }
 658                 rc = 0;
 659                 *ppCurrentEntry = current_entry;
 660         } else {
 661                 cFYI(1,("index not in buffer - could not findnext into it"));
 662                 return 0;
 663         }
 664
 665         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 666                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 667                 *num_to_ret = 0;
 668         } else
 669                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 670
 671         return rc;
 672 }
 673
 674 /* inode num, inode type and filename returned */
 675 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 676         char *current_entry, __u16 level, unsigned int unicode,
 677         struct cifs_sb_info * cifs_sb, ino_t *pinum)
 678 {
 679         int rc = 0;
 680         unsigned int len = 0;
 681         char * filename;
 682         struct nls_table * nlt = cifs_sb->local_nls;
 683
 684         *pinum = 0;
 685
 686         if(level == SMB_FIND_FILE_UNIX) {
 687                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 688
 689                 filename = &pFindData->FileName[0];
 690                 if(unicode) {
 691                         len = cifs_unicode_bytelen(filename);
 692                 } else {
 693                         /* BB should we make this strnlen of PATH_MAX? */
 694                         len = strnlen(filename, PATH_MAX);
 695                 }
 696
 697                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 698                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 699                         *pinum = pFindData->UniqueId;
 700         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 701                 FILE_DIRECTORY_INFO * pFindData =
 702                         (FILE_DIRECTORY_INFO *)current_entry;
 703                 filename = &pFindData->FileName[0];
 704                 len = le32_to_cpu(pFindData->FileNameLength);
 705         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 706                 FILE_FULL_DIRECTORY_INFO * pFindData =
 707                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 708                 filename = &pFindData->FileName[0];
 709                 len = le32_to_cpu(pFindData->FileNameLength);
 710         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 711                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 712                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 713                 filename = &pFindData->FileName[0];
 714                 len = le32_to_cpu(pFindData->FileNameLength);
 715                 *pinum = pFindData->UniqueId;
 716         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 717                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 718                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 719                 filename = &pFindData->FileName[0];
 720                 len = le32_to_cpu(pFindData->FileNameLength);
 721         } else {
 722                 cFYI(1,("Unknown findfirst level %d",level));
 723                 return -EINVAL;
 724         }
 725         if(unicode) {
 726                 /* BB fixme - test with long names */
 727                 /* Note converted filename can be longer than in unicode */
 728                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 729                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 730                                         (__le16 *)filename, len/2, nlt);
 731                 else
 732                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 733                                         (__le16 *)filename,len/2,nlt);
 734         } else {
 735                 pqst->name = filename;
 736                 pqst->len = len;
 737         }
 738         pqst->hash = full_name_hash(pqst->name,pqst->len);
 739 /*      cFYI(1,("filldir on %s",pqst->name));  */
 740         return rc;
 741 }
 742
 743 static int cifs_filldir(char *pfindEntry, struct file *file,
 744         filldir_t filldir, void *direntry, char *scratch_buf)
 745 {
 746         int rc = 0;
 747         struct qstr qstring;
 748         struct cifsFileInfo * pCifsF;
 749         unsigned obj_type;
 750         ino_t  inum;
 751         struct cifs_sb_info * cifs_sb;
 752         struct inode *tmp_inode;
 753         struct dentry *tmp_dentry;
 754
 755         /* get filename and len into qstring */
 756         /* get dentry */
 757         /* decide whether to create and populate ionde */
 758         if((direntry == NULL) || (file == NULL))
 759                 return -EINVAL;
 760
 761         pCifsF = file->private_data;
 762
 763         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 764                 return -ENOENT;
 765
 766         if(file->f_dentry == NULL)
 767                 return -ENOENT;
 768
 769         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
 770         /* skip . and .. since we added them first */
 771         if(rc != 0)
 772                 return 0;
 773
 774         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 775
 776         qstring.name = scratch_buf;
 777         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 778                         pCifsF->srch_inf.info_level,
 779                         pCifsF->srch_inf.unicode,cifs_sb,
 780                         &inum /* returned */);
 781
 782         if(rc)
 783                 return rc;
 784
 785         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 786         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 787                 return -ENOMEM;
 788
 789         if(rc) {
 790                 /* inode created, we need to hash it with right inode number */
 791                 if(inum != 0) {
 792                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 793                         tmp_inode->i_ino = inum;
 794                 }
 795                 insert_inode_hash(tmp_inode);
 796         }
 797
 798         /* we pass in rc below, indicating whether it is a new inode,
 799            so we can figure out whether to invalidate the inode cached
 800            data if the file has changed */
 801         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 802                 unix_fill_in_inode(tmp_inode,
 803                                    (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
 804         } else {
 805                 fill_in_inode(tmp_inode,
 806                               (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
 807         }
 808
 809         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 810                      tmp_inode->i_ino,obj_type);
 811         if(rc) {
 812                 cFYI(1,("filldir rc = %d",rc));
 813         }
 814
 815         dput(tmp_dentry);
 816         return rc;
 817 }
 818
 819 static int cifs_save_resume_key(const char *current_entry,
 820         struct cifsFileInfo *cifsFile)
 821 {
 822         int rc = 0;
 823         unsigned int len = 0;
 824         __u16 level;
 825         char * filename;
 826
 827         if((cifsFile == NULL) || (current_entry == NULL))
 828                 return -EINVAL;
 829
 830         level = cifsFile->srch_inf.info_level;
 831
 832         if(level == SMB_FIND_FILE_UNIX) {
 833                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 834
 835                 filename = &pFindData->FileName[0];
 836                 if(cifsFile->srch_inf.unicode) {
 837                         len = cifs_unicode_bytelen(filename);
 838                 } else {
 839                         /* BB should we make this strnlen of PATH_MAX? */
 840                         len = strnlen(filename, PATH_MAX);
 841                 }
 842                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 843         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 844                 FILE_DIRECTORY_INFO * pFindData =
 845                         (FILE_DIRECTORY_INFO *)current_entry;
 846                 filename = &pFindData->FileName[0];
 847                 len = le32_to_cpu(pFindData->FileNameLength);
 848                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 849         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 850                 FILE_FULL_DIRECTORY_INFO * pFindData =
 851                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 852                 filename = &pFindData->FileName[0];
 853                 len = le32_to_cpu(pFindData->FileNameLength);
 854                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 855         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 856                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 857                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 858                 filename = &pFindData->FileName[0];
 859                 len = le32_to_cpu(pFindData->FileNameLength);
 860                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 861         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 862                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 863                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 864                 filename = &pFindData->FileName[0];
 865                 len = le32_to_cpu(pFindData->FileNameLength);
 866                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 867         } else {
 868                 cFYI(1,("Unknown findfirst level %d",level));
 869                 return -EINVAL;
 870         }
 871         cifsFile->srch_inf.resume_name_len = len;
 872         cifsFile->srch_inf.presume_name = filename;
 873         return rc;
 874 }
 875
 876 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 877 {
 878         int rc = 0;
 879         int xid,i;
 880         struct cifs_sb_info *cifs_sb;
 881         struct cifsTconInfo *pTcon;
 882         struct cifsFileInfo *cifsFile = NULL;
 883         char * current_entry;
 884         int num_to_fill = 0;
 885         char * tmp_buf = NULL;
 886         char * end_of_smb;
 887
 888         xid = GetXid();
 889
 890         if(file->f_dentry == NULL) {
 891                 FreeXid(xid);
 892                 return -EIO;
 893         }
 894
 895         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 896         pTcon = cifs_sb->tcon;
 897         if(pTcon == NULL)
 898                 return -EINVAL;
 899
 900         switch ((int) file->f_pos) {
 901         case 0:
 902                 if (filldir(direntry, ".", 1, file->f_pos,
 903                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 904                         cERROR(1, ("Filldir for current dir failed"));
 905                         rc = -ENOMEM;
 906                         break;
 907                 }
 908                 file->f_pos++;
 909         case 1:
 910                 if (filldir(direntry, "..", 2, file->f_pos,
 911                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 912                         cERROR(1, ("Filldir for parent dir failed "));
 913                         rc = -ENOMEM;
 914                         break;
 915                 }
 916                 file->f_pos++;
 917         default:
 918                 /* 1) If search is active,
 919                         is in current search buffer?
 920                         if it before then restart search
 921                         if after then keep searching till find it */
 922
 923                 if(file->private_data == NULL) {
 924                         rc = initiate_cifs_search(xid,file);
 925                         cFYI(1,("initiate cifs search rc %d",rc));
 926                         if(rc) {
 927                                 FreeXid(xid);
 928                                 return rc;
 929                         }
 930                 }
 931                 if(file->private_data == NULL) {
 932                         rc = -EINVAL;
 933                         FreeXid(xid);
 934                         return rc;
 935                 }
 936                 cifsFile = file->private_data;
 937                 if (cifsFile->srch_inf.endOfSearch) {
 938                         if(cifsFile->srch_inf.emptyDir) {
 939                                 cFYI(1, ("End of search, empty dir"));
 940                                 rc = 0;
 941                                 break;
 942                         }
 943                 } /* else {
 944                         cifsFile->invalidHandle = TRUE;
 945                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 946                 }
 947                 kfree(cifsFile->search_resume_name);
 948                 cifsFile->search_resume_name = NULL; */
 949
 950                 rc = find_cifs_entry(xid,pTcon, file,
 951                                 &current_entry,&num_to_fill);
 952                 if(rc) {
 953                         cFYI(1,("fce error %d",rc));
 954                         goto rddir2_exit;
 955                 } else if (current_entry != NULL) {
 956                         cFYI(1,("entry %lld found",file->f_pos));
 957                 } else {
 958                         cFYI(1,("could not find entry"));
 959                         goto rddir2_exit;
 960                 }
 961                 cFYI(1,("loop through %d times filling dir for net buf %p",
 962                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
 963                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 964                         smbCalcSize((struct smb_hdr *)
 965                                     cifsFile->srch_inf.ntwrk_buf_start);
 966                 /* To be safe - for UCS to UTF-8 with strings loaded
 967                 with the rare long characters alloc more to account for
 968                 such multibyte target UTF-8 characters. cifs_unicode.c,
 969                 which actually does the conversion, has the same limit */
 970                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
 971                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
 972                         if(current_entry == NULL) {
 973                                 /* evaluate whether this case is an error */
 974                                 cERROR(1,("past end of SMB num to fill %d i %d",
 975                                           num_to_fill, i));
 976                                 break;
 977                         }
 978                         /* if buggy server returns . and .. late do
 979                         we want to check for that here? */
 980                         rc = cifs_filldir(current_entry, file,
 981                                         filldir, direntry,tmp_buf);
 982                         file->f_pos++;
 983                         if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
 984                                 cFYI(1,("last entry in buf at pos %lld %s",
 985                                         file->f_pos,tmp_buf)); /* BB removeme BB */
 986                                 cifs_save_resume_key(current_entry,cifsFile);
 987                                 break;
 988                         } else
 989                                 current_entry = nxt_dir_entry(current_entry,
 990                                                               end_of_smb);
 991                 }
 992                 kfree(tmp_buf);
 993                 break;
 994         } /* end switch */
 995
 996 rddir2_exit:
 997         FreeXid(xid);
 998         return rc;
 999 }