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,
 201              ("File Size %ld and blocks %ld and blocksize %ld",
 202               (unsigned long)tmp_inode->i_size, 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                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 218                         tmp_inode->i_fop->lock = NULL;
 219                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 220                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 221                    (cifs_sb->tcon->ses->server->maxBuf <
 222                         4096 + MAX_CIFS_HDR_SIZE))
 223                         tmp_inode->i_data.a_ops->readpages = NULL;
 224                 if(isNewInode)
 225                         return; /* No sense invalidating pages for new inode
 226                                    since have not started caching readahead file
 227                                    data yet */
 228
 229                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 230                         (local_size == tmp_inode->i_size)) {
 231                         cFYI(1, ("inode exists but unchanged"));
 232                 } else {
 233                         /* file may have changed on server */
 234                         cFYI(1, ("invalidate inode, readdir detected change"));
 235                         invalidate_remote_inode(tmp_inode);
 236                 }
 237         } else if (S_ISDIR(tmp_inode->i_mode)) {
 238                 cFYI(1, ("Directory inode"));
 239                 tmp_inode->i_op = &cifs_dir_inode_ops;
 240                 tmp_inode->i_fop = &cifs_dir_ops;
 241         } else if (S_ISLNK(tmp_inode->i_mode)) {
 242                 cFYI(1, ("Symbolic Link inode"));
 243                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 244         } else {
 245                 cFYI(1, ("Init special inode"));
 246                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 247                                    tmp_inode->i_rdev);
 248         }
 249 }
 250
 251 static void unix_fill_in_inode(struct inode *tmp_inode,
 252         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 253 {
 254         loff_t local_size;
 255         struct timespec local_mtime;
 256
 257         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 258         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 259
 260         __u32 type = le32_to_cpu(pfindData->Type);
 261         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 262         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 263         cifsInfo->time = jiffies;
 264         atomic_inc(&cifsInfo->inUse);
 265
 266         /* save mtime and size */
 267         local_mtime = tmp_inode->i_mtime;
 268         local_size  = tmp_inode->i_size;
 269
 270         tmp_inode->i_atime =
 271             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 272         tmp_inode->i_mtime =
 273             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 274         tmp_inode->i_ctime =
 275             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 276
 277         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 278         /* since we set the inode type below we need to mask off type
 279            to avoid strange results if bits above were corrupt */
 280         tmp_inode->i_mode &= ~S_IFMT;
 281         if (type == UNIX_FILE) {
 282                 *pobject_type = DT_REG;
 283                 tmp_inode->i_mode |= S_IFREG;
 284         } else if (type == UNIX_SYMLINK) {
 285                 *pobject_type = DT_LNK;
 286                 tmp_inode->i_mode |= S_IFLNK;
 287         } else if (type == UNIX_DIR) {
 288                 *pobject_type = DT_DIR;
 289                 tmp_inode->i_mode |= S_IFDIR;
 290         } else if (type == UNIX_CHARDEV) {
 291                 *pobject_type = DT_CHR;
 292                 tmp_inode->i_mode |= S_IFCHR;
 293                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 294                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 295         } else if (type == UNIX_BLOCKDEV) {
 296                 *pobject_type = DT_BLK;
 297                 tmp_inode->i_mode |= S_IFBLK;
 298                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 299                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 300         } else if (type == UNIX_FIFO) {
 301                 *pobject_type = DT_FIFO;
 302                 tmp_inode->i_mode |= S_IFIFO;
 303         } else if (type == UNIX_SOCKET) {
 304                 *pobject_type = DT_SOCK;
 305                 tmp_inode->i_mode |= S_IFSOCK;
 306         } else {
 307                 /* safest to just call it a file */
 308                 *pobject_type = DT_REG;
 309                 tmp_inode->i_mode |= S_IFREG;
 310                 cFYI(1,("unknown inode type %d",type));
 311         }
 312
 313         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 314         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 315         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 316
 317         if (is_size_safe_to_change(cifsInfo)) {
 318                 /* can not safely change the file size here if the
 319                 client is writing to it due to potential races */
 320                 i_size_write(tmp_inode,end_of_file);
 321
 322         /* 512 bytes (2**9) is the fake blocksize that must be used */
 323         /* for this calculation, not the real blocksize */
 324                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 325         }
 326
 327         if (S_ISREG(tmp_inode->i_mode)) {
 328                 cFYI(1, ("File inode"));
 329                 tmp_inode->i_op = &cifs_file_inode_ops;
 330                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 331                         tmp_inode->i_fop = &cifs_file_direct_ops;
 332                 else
 333                         tmp_inode->i_fop = &cifs_file_ops;
 334                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 335                         tmp_inode->i_fop->lock = NULL;
 336                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 337                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 338                    (cifs_sb->tcon->ses->server->maxBuf <
 339                         4096 + MAX_CIFS_HDR_SIZE))
 340                         tmp_inode->i_data.a_ops->readpages = NULL;
 341
 342                 if(isNewInode)
 343                         return; /* No sense invalidating pages for new inode since we
 344                                            have not started caching readahead file data yet */
 345
 346                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 347                         (local_size == tmp_inode->i_size)) {
 348                         cFYI(1, ("inode exists but unchanged"));
 349                 } else {
 350                         /* file may have changed on server */
 351                         cFYI(1, ("invalidate inode, readdir detected change"));
 352                         invalidate_remote_inode(tmp_inode);
 353                 }
 354         } else if (S_ISDIR(tmp_inode->i_mode)) {
 355                 cFYI(1, ("Directory inode"));
 356                 tmp_inode->i_op = &cifs_dir_inode_ops;
 357                 tmp_inode->i_fop = &cifs_dir_ops;
 358         } else if (S_ISLNK(tmp_inode->i_mode)) {
 359                 cFYI(1, ("Symbolic Link inode"));
 360                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 361 /* tmp_inode->i_fop = *//* do not need to set to anything */
 362         } else {
 363                 cFYI(1, ("Special inode"));
 364                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 365                                    tmp_inode->i_rdev);
 366         }
 367 }
 368
 369 static int initiate_cifs_search(const int xid, struct file *file)
 370 {
 371         int rc = 0;
 372         char * full_path;
 373         struct cifsFileInfo * cifsFile;
 374         struct cifs_sb_info *cifs_sb;
 375         struct cifsTconInfo *pTcon;
 376
 377         if(file->private_data == NULL) {
 378                 file->private_data =
 379                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 380         }
 381
 382         if(file->private_data == NULL) {
 383                 return -ENOMEM;
 384         } else {
 385                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 386         }
 387         cifsFile = file->private_data;
 388         cifsFile->invalidHandle = TRUE;
 389         cifsFile->srch_inf.endOfSearch = FALSE;
 390
 391         if(file->f_dentry == NULL)
 392                 return -ENOENT;
 393
 394         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 395         if(cifs_sb == NULL)
 396                 return -EINVAL;
 397
 398         pTcon = cifs_sb->tcon;
 399         if(pTcon == NULL)
 400                 return -EINVAL;
 401
 402         down(&file->f_dentry->d_sb->s_vfs_rename_sem);
 403         full_path = build_path_from_dentry(file->f_dentry);
 404         up(&file->f_dentry->d_sb->s_vfs_rename_sem);
 405
 406         if(full_path == NULL) {
 407                 return -ENOMEM;
 408         }
 409
 410         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 411
 412 ffirst_retry:
 413         /* test for Unix extensions */
 414         if (pTcon->ses->capabilities & CAP_UNIX) {
 415                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 416         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 417                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 418         } else /* not srvinos - BB fixme add check for backlevel? */ {
 419                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 420         }
 421
 422         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 423                 &cifsFile->netfid, &cifsFile->srch_inf,
 424                 cifs_sb->mnt_cifs_flags &
 425                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 426         if(rc == 0)
 427                 cifsFile->invalidHandle = FALSE;
 428         if((rc == -EOPNOTSUPP) &&
 429                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 430                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 431                 goto ffirst_retry;
 432         }
 433         kfree(full_path);
 434         return rc;
 435 }
 436
 437 /* return length of unicode string in bytes */
 438 static int cifs_unicode_bytelen(char *str)
 439 {
 440         int len;
 441         __le16 * ustr = (__le16 *)str;
 442
 443         for(len=0;len <= PATH_MAX;len++) {
 444                 if(ustr[len] == 0)
 445                         return len << 1;
 446         }
 447         cFYI(1,("Unicode string longer than PATH_MAX found"));
 448         return len << 1;
 449 }
 450
 451 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
 452 {
 453         char * new_entry;
 454         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 455
 456         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 457         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 458         /* validate that new_entry is not past end of SMB */
 459         if(new_entry >= end_of_smb) {
 460                 cERROR(1,
 461                       ("search entry %p began after end of SMB %p old entry %p",
 462                         new_entry, end_of_smb, old_entry));
 463                 return NULL;
 464         } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
 465                 cERROR(1,("search entry %p extends after end of SMB %p",
 466                         new_entry, end_of_smb));
 467                 return NULL;
 468         } else
 469                 return new_entry;
 470
 471 }
 472
 473 #define UNICODE_DOT cpu_to_le16(0x2e)
 474
 475 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 476 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 477 {
 478         int rc = 0;
 479         char * filename = NULL;
 480         int len = 0;
 481
 482         if(cfile->srch_inf.info_level == 0x202) {
 483                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 484                 filename = &pFindData->FileName[0];
 485                 if(cfile->srch_inf.unicode) {
 486                         len = cifs_unicode_bytelen(filename);
 487                 } else {
 488                         /* BB should we make this strnlen of PATH_MAX? */
 489                         len = strnlen(filename, 5);
 490                 }
 491         } else if(cfile->srch_inf.info_level == 0x101) {
 492                 FILE_DIRECTORY_INFO * pFindData =
 493                         (FILE_DIRECTORY_INFO *)current_entry;
 494                 filename = &pFindData->FileName[0];
 495                 len = le32_to_cpu(pFindData->FileNameLength);
 496         } else if(cfile->srch_inf.info_level == 0x102) {
 497                 FILE_FULL_DIRECTORY_INFO * pFindData =
 498                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 499                 filename = &pFindData->FileName[0];
 500                 len = le32_to_cpu(pFindData->FileNameLength);
 501         } else if(cfile->srch_inf.info_level == 0x105) {
 502                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 503                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 504                 filename = &pFindData->FileName[0];
 505                 len = le32_to_cpu(pFindData->FileNameLength);
 506         } else if(cfile->srch_inf.info_level == 0x104) {
 507                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 508                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 509                 filename = &pFindData->FileName[0];
 510                 len = le32_to_cpu(pFindData->FileNameLength);
 511         } else {
 512                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 513         }
 514
 515         if(filename) {
 516                 if(cfile->srch_inf.unicode) {
 517                         __le16 *ufilename = (__le16 *)filename;
 518                         if(len == 2) {
 519                                 /* check for . */
 520                                 if(ufilename[0] == UNICODE_DOT)
 521                                         rc = 1;
 522                         } else if(len == 4) {
 523                                 /* check for .. */
 524                                 if((ufilename[0] == UNICODE_DOT)
 525                                    &&(ufilename[1] == UNICODE_DOT))
 526                                         rc = 2;
 527                         }
 528                 } else /* ASCII */ {
 529                         if(len == 1) {
 530                                 if(filename[0] == '.')
 531                                         rc = 1;
 532                         } else if(len == 2) {
 533                                 if((filename[0] == '.') && (filename[1] == '.'))
 534                                         rc = 2;
 535                         }
 536                 }
 537         }
 538
 539         return rc;
 540 }
 541
 542 /* Check if directory that we are searching has changed so we can decide
 543    whether we can use the cached search results from the previous search */
 544 static int is_dir_changed(struct file * file)
 545 {
 546         struct inode * inode;
 547         struct cifsInodeInfo *cifsInfo;
 548
 549         if(file->f_dentry == NULL)
 550                 return 0;
 551
 552         inode = file->f_dentry->d_inode;
 553
 554         if(inode == NULL)
 555                 return 0;
 556
 557         cifsInfo = CIFS_I(inode);
 558
 559         if(cifsInfo->time == 0)
 560                 return 1; /* directory was changed, perhaps due to unlink */
 561         else
 562                 return 0;
 563
 564 }
 565
 566 /* find the corresponding entry in the search */
 567 /* Note that the SMB server returns search entries for . and .. which
 568    complicates logic here if we choose to parse for them and we do not
 569    assume that they are located in the findfirst return buffer.*/
 570 /* We start counting in the buffer with entry 2 and increment for every
 571    entry (do not increment for . or .. entry) */
 572 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 573         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 574 {
 575         int rc = 0;
 576         int pos_in_buf = 0;
 577         loff_t first_entry_in_buffer;
 578         loff_t index_to_find = file->f_pos;
 579         struct cifsFileInfo * cifsFile = file->private_data;
 580         /* check if index in the buffer */
 581
 582         if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 583            (num_to_ret == NULL))
 584                 return -ENOENT;
 585
 586         *ppCurrentEntry = NULL;
 587         first_entry_in_buffer =
 588                 cifsFile->srch_inf.index_of_last_entry -
 589                         cifsFile->srch_inf.entries_in_buffer;
 590 /*      dump_cifs_file_struct(file, "In fce ");*/
 591         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 592              is_dir_changed(file)) ||
 593            (index_to_find < first_entry_in_buffer)) {
 594                 /* close and restart search */
 595                 cFYI(1,("search backing up - close and restart search"));
 596                 cifsFile->invalidHandle = TRUE;
 597                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 598                 kfree(cifsFile->search_resume_name);
 599                 cifsFile->search_resume_name = NULL;
 600                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 601                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 602                         cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
 603                 }
 604                 rc = initiate_cifs_search(xid,file);
 605                 if(rc) {
 606                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 607                         return rc;
 608                 }
 609         }
 610
 611         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 612               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 613                 cFYI(1,("calling findnext2"));
 614                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 615                                   &cifsFile->srch_inf);
 616                 if(rc)
 617                         return -ENOENT;
 618         }
 619         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 620                 /* we found the buffer that contains the entry */
 621                 /* scan and find it */
 622                 int i;
 623                 char * current_entry;
 624                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 625                         smbCalcSize((struct smb_hdr *)
 626                                 cifsFile->srch_inf.ntwrk_buf_start);
 627                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 628                                         - cifsFile->srch_inf.entries_in_buffer;
 629                 pos_in_buf = index_to_find - first_entry_in_buffer;
 630                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 631                 current_entry = cifsFile->srch_inf.srch_entries_start;
 632                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 633                         /* go entry by entry figuring out which is first */
 634                         /* if( . or ..)
 635                                 skip */
 636                         rc = cifs_entry_is_dot(current_entry,cifsFile);
 637                         if(rc == 1) /* is . or .. so skip */ {
 638                                 cFYI(1,("Entry is .")); /* BB removeme BB */
 639                                 /* continue; */
 640                         } else if (rc == 2 ) {
 641                                 cFYI(1,("Entry is ..")); /* BB removeme BB */
 642                                 /* continue; */
 643                         }
 644                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
 645                 }
 646                 if((current_entry == NULL) && (i < pos_in_buf)) {
 647                         /* BB fixme - check if we should flag this error */
 648                         cERROR(1,("reached end of buf searching for pos in buf"
 649                           " %d index to find %lld rc %d",
 650                           pos_in_buf,index_to_find,rc));
 651                 }
 652                 rc = 0;
 653                 *ppCurrentEntry = current_entry;
 654         } else {
 655                 cFYI(1,("index not in buffer - could not findnext into it"));
 656                 return 0;
 657         }
 658
 659         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 660                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 661                 *num_to_ret = 0;
 662         } else
 663                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 664
 665         return rc;
 666 }
 667
 668 /* inode num, inode type and filename returned */
 669 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 670         char *current_entry, __u16 level, unsigned int unicode,
 671         struct cifs_sb_info * cifs_sb, ino_t *pinum)
 672 {
 673         int rc = 0;
 674         unsigned int len = 0;
 675         char * filename;
 676         struct nls_table * nlt = cifs_sb->local_nls;
 677
 678         *pinum = 0;
 679
 680         if(level == SMB_FIND_FILE_UNIX) {
 681                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 682
 683                 filename = &pFindData->FileName[0];
 684                 if(unicode) {
 685                         len = cifs_unicode_bytelen(filename);
 686                 } else {
 687                         /* BB should we make this strnlen of PATH_MAX? */
 688                         len = strnlen(filename, PATH_MAX);
 689                 }
 690
 691                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 692                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 693                         *pinum = pFindData->UniqueId;
 694         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 695                 FILE_DIRECTORY_INFO * pFindData =
 696                         (FILE_DIRECTORY_INFO *)current_entry;
 697                 filename = &pFindData->FileName[0];
 698                 len = le32_to_cpu(pFindData->FileNameLength);
 699         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 700                 FILE_FULL_DIRECTORY_INFO * pFindData =
 701                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 702                 filename = &pFindData->FileName[0];
 703                 len = le32_to_cpu(pFindData->FileNameLength);
 704         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 705                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 706                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 707                 filename = &pFindData->FileName[0];
 708                 len = le32_to_cpu(pFindData->FileNameLength);
 709                 *pinum = pFindData->UniqueId;
 710         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 711                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 712                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 713                 filename = &pFindData->FileName[0];
 714                 len = le32_to_cpu(pFindData->FileNameLength);
 715         } else {
 716                 cFYI(1,("Unknown findfirst level %d",level));
 717                 return -EINVAL;
 718         }
 719         if(unicode) {
 720                 /* BB fixme - test with long names */
 721                 /* Note converted filename can be longer than in unicode */
 722                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 723                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 724                                         (__le16 *)filename, len/2, nlt);
 725                 else
 726                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 727                                         (__le16 *)filename,len/2,nlt);
 728         } else {
 729                 pqst->name = filename;
 730                 pqst->len = len;
 731         }
 732         pqst->hash = full_name_hash(pqst->name,pqst->len);
 733 /*      cFYI(1,("filldir on %s",pqst->name));  */
 734         return rc;
 735 }
 736
 737 static int cifs_filldir(char *pfindEntry, struct file *file,
 738         filldir_t filldir, void *direntry, char *scratch_buf)
 739 {
 740         int rc = 0;
 741         struct qstr qstring;
 742         struct cifsFileInfo * pCifsF;
 743         unsigned obj_type;
 744         ino_t  inum;
 745         struct cifs_sb_info * cifs_sb;
 746         struct inode *tmp_inode;
 747         struct dentry *tmp_dentry;
 748
 749         /* get filename and len into qstring */
 750         /* get dentry */
 751         /* decide whether to create and populate ionde */
 752         if((direntry == NULL) || (file == NULL))
 753                 return -EINVAL;
 754
 755         pCifsF = file->private_data;
 756
 757         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 758                 return -ENOENT;
 759
 760         if(file->f_dentry == NULL)
 761                 return -ENOENT;
 762
 763         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 764
 765         qstring.name = scratch_buf;
 766         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 767                         pCifsF->srch_inf.info_level,
 768                         pCifsF->srch_inf.unicode,cifs_sb,
 769                         &inum /* returned */);
 770
 771         if(rc)
 772                 return rc;
 773
 774         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 775         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 776                 return -ENOMEM;
 777
 778         if(rc) {
 779                 /* inode created, we need to hash it with right inode number */
 780                 if(inum != 0) {
 781                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 782                         tmp_inode->i_ino = inum;
 783                 }
 784                 insert_inode_hash(tmp_inode);
 785         }
 786
 787         /* we pass in rc below, indicating whether it is a new inode,
 788            so we can figure out whether to invalidate the inode cached
 789            data if the file has changed */
 790         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 791                 unix_fill_in_inode(tmp_inode,
 792                                    (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
 793         } else {
 794                 fill_in_inode(tmp_inode,
 795                               (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
 796         }
 797
 798         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 799                      tmp_inode->i_ino,obj_type);
 800         if(rc) {
 801                 cFYI(1,("filldir rc = %d",rc));
 802         }
 803
 804         dput(tmp_dentry);
 805         return rc;
 806 }
 807
 808 static int cifs_save_resume_key(const char *current_entry,
 809         struct cifsFileInfo *cifsFile)
 810 {
 811         int rc = 0;
 812         unsigned int len = 0;
 813         __u16 level;
 814         char * filename;
 815
 816         if((cifsFile == NULL) || (current_entry == NULL))
 817                 return -EINVAL;
 818
 819         level = cifsFile->srch_inf.info_level;
 820
 821         if(level == SMB_FIND_FILE_UNIX) {
 822                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 823
 824                 filename = &pFindData->FileName[0];
 825                 if(cifsFile->srch_inf.unicode) {
 826                         len = cifs_unicode_bytelen(filename);
 827                 } else {
 828                         /* BB should we make this strnlen of PATH_MAX? */
 829                         len = strnlen(filename, PATH_MAX);
 830                 }
 831                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 832         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 833                 FILE_DIRECTORY_INFO * pFindData =
 834                         (FILE_DIRECTORY_INFO *)current_entry;
 835                 filename = &pFindData->FileName[0];
 836                 len = le32_to_cpu(pFindData->FileNameLength);
 837                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 838         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 839                 FILE_FULL_DIRECTORY_INFO * pFindData =
 840                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 841                 filename = &pFindData->FileName[0];
 842                 len = le32_to_cpu(pFindData->FileNameLength);
 843                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 844         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 845                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 846                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 847                 filename = &pFindData->FileName[0];
 848                 len = le32_to_cpu(pFindData->FileNameLength);
 849                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 850         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 851                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 852                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 853                 filename = &pFindData->FileName[0];
 854                 len = le32_to_cpu(pFindData->FileNameLength);
 855                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 856         } else {
 857                 cFYI(1,("Unknown findfirst level %d",level));
 858                 return -EINVAL;
 859         }
 860         cifsFile->srch_inf.resume_name_len = len;
 861         cifsFile->srch_inf.presume_name = filename;
 862         return rc;
 863 }
 864
 865 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 866 {
 867         int rc = 0;
 868         int xid,i;
 869         struct cifs_sb_info *cifs_sb;
 870         struct cifsTconInfo *pTcon;
 871         struct cifsFileInfo *cifsFile = NULL;
 872         char * current_entry;
 873         int num_to_fill = 0;
 874         char * tmp_buf = NULL;
 875         char * end_of_smb;
 876
 877         xid = GetXid();
 878
 879         if(file->f_dentry == NULL) {
 880                 FreeXid(xid);
 881                 return -EIO;
 882         }
 883
 884         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 885         pTcon = cifs_sb->tcon;
 886         if(pTcon == NULL)
 887                 return -EINVAL;
 888
 889         switch ((int) file->f_pos) {
 890         case 0:
 891                 /*if (filldir(direntry, ".", 1, file->f_pos,
 892                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 893                         cERROR(1, ("Filldir for current dir failed "));
 894                         rc = -ENOMEM;
 895                         break;
 896                 }
 897                 file->f_pos++; */
 898         case 1:
 899                 /* if (filldir(direntry, "..", 2, file->f_pos,
 900                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 901                         cERROR(1, ("Filldir for parent dir failed "));
 902                         rc = -ENOMEM;
 903                         break;
 904                 }
 905                 file->f_pos++; */
 906         case 2:
 907                 /* 1) If search is active,
 908                         is in current search buffer?
 909                         if it before then restart search
 910                         if after then keep searching till find it */
 911
 912                 if(file->private_data == NULL) {
 913                         rc = initiate_cifs_search(xid,file);
 914                         cFYI(1,("initiate cifs search rc %d",rc));
 915                         if(rc) {
 916                                 FreeXid(xid);
 917                                 return rc;
 918                         }
 919                 }
 920         default:
 921                 if(file->private_data == NULL) {
 922                         rc = -EINVAL;
 923                         FreeXid(xid);
 924                         return rc;
 925                 }
 926                 cifsFile = file->private_data;
 927                 if (cifsFile->srch_inf.endOfSearch) {
 928                         if(cifsFile->srch_inf.emptyDir) {
 929                                 cFYI(1, ("End of search, empty dir"));
 930                                 rc = 0;
 931                                 break;
 932                         }
 933                 } /* else {
 934                         cifsFile->invalidHandle = TRUE;
 935                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 936                 }
 937                 kfree(cifsFile->search_resume_name);
 938                 cifsFile->search_resume_name = NULL; */
 939
 940                 /* BB account for . and .. in f_pos as special case */
 941
 942                 rc = find_cifs_entry(xid,pTcon, file,
 943                                 &current_entry,&num_to_fill);
 944                 if(rc) {
 945                         cFYI(1,("fce error %d",rc));
 946                         goto rddir2_exit;
 947                 } else if (current_entry != NULL) {
 948                         cFYI(1,("entry %lld found",file->f_pos));
 949                 } else {
 950                         cFYI(1,("could not find entry"));
 951                         goto rddir2_exit;
 952                 }
 953                 cFYI(1,("loop through %d times filling dir for net buf %p",
 954                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
 955                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 956                         smbCalcSize((struct smb_hdr *)
 957                                     cifsFile->srch_inf.ntwrk_buf_start);
 958                 /* To be safe - for UCS to UTF-8 with strings loaded
 959                 with the rare long characters alloc more to account for
 960                 such multibyte target UTF-8 characters. cifs_unicode.c,
 961                 which actually does the conversion, has the same limit */
 962                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
 963                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
 964                         if(current_entry == NULL) {
 965                                 /* evaluate whether this case is an error */
 966                                 cERROR(1,("past end of SMB num to fill %d i %d",
 967                                           num_to_fill, i));
 968                                 break;
 969                         }
 970
 971                         rc = cifs_filldir(current_entry, file,
 972                                         filldir, direntry,tmp_buf);
 973                         file->f_pos++;
 974                         if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
 975                                 cFYI(1,("last entry in buf at pos %lld %s",
 976                                         file->f_pos,tmp_buf)); /* BB removeme BB */
 977                                 cifs_save_resume_key(current_entry,cifsFile);
 978                                 break;
 979                         } else
 980                                 current_entry = nxt_dir_entry(current_entry,
 981                                                               end_of_smb);
 982                 }
 983                 kfree(tmp_buf);
 984                 break;
 985         } /* end switch */
 986
 987 rddir2_exit:
 988         FreeXid(xid);
 989         return rc;
 990 }