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                 tmp_dentry->d_op = &cifs_dentry_ops;
  95                 if(*ptmp_inode == NULL)
  96                         return rc;
  97                 rc = 1;
  98                 d_instantiate(tmp_dentry, *ptmp_inode);
  99                 d_rehash(tmp_dentry);
 100         }
 101
 102         tmp_dentry->d_time = jiffies;
 103         *pnew_dentry = tmp_dentry;
 104         return rc;
 105 }
 106
 107 static void fill_in_inode(struct inode *tmp_inode,
 108         FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
 109 {
 110         loff_t local_size;
 111         struct timespec local_mtime;
 112
 113         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 114         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 115         __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 116         __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 117         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 118
 119         cifsInfo->cifsAttrs = attr;
 120         cifsInfo->time = jiffies;
 121
 122         /* save mtime and size */
 123         local_mtime = tmp_inode->i_mtime;
 124         local_size  = tmp_inode->i_size;
 125
 126         /* Linux can not store file creation time unfortunately so ignore it */
 127         tmp_inode->i_atime =
 128             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 129         tmp_inode->i_mtime =
 130             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 131         tmp_inode->i_ctime =
 132             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 133         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 134         /* 2767 perms - indicate mandatory locking */
 135                 /* BB fill in uid and gid here? with help from winbind?
 136                    or retrieve from NTFS stream extended attribute */
 137         if (atomic_read(&cifsInfo->inUse) == 0) {
 138                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 139                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 140                 /* set default mode. will override for dirs below */
 141                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 142         }
 143
 144         if (attr & ATTR_DIRECTORY) {
 145                 *pobject_type = DT_DIR;
 146                 /* override default perms since we do not lock dirs */
 147                 if(atomic_read(&cifsInfo->inUse) == 0) {
 148                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 149                 }
 150                 tmp_inode->i_mode |= S_IFDIR;
 151         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 152                    (attr & ATTR_SYSTEM) && (end_of_file == 0)) {
 153                 *pobject_type = DT_FIFO;
 154                 tmp_inode->i_mode |= S_IFIFO;
 155 /* BB Finish for SFU style symlinks and devies */
 156 /*      } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 157                 (attr & ATTR_SYSTEM) && ) { */
 158 /* we no longer mark these because we could not follow them */
 159 /*        } else if (attr & ATTR_REPARSE) {
 160                 *pobject_type = DT_LNK;
 161                 tmp_inode->i_mode |= S_IFLNK; */
 162         } else {
 163                 *pobject_type = DT_REG;
 164                 tmp_inode->i_mode |= S_IFREG;
 165                 if (attr & ATTR_READONLY)
 166                         tmp_inode->i_mode &= ~(S_IWUGO);
 167         } /* could add code here - to validate if device or weird share type? */
 168
 169         /* can not fill in nlink here as in qpathinfo version and Unx search */
 170         if (atomic_read(&cifsInfo->inUse) == 0) {
 171                 atomic_set(&cifsInfo->inUse, 1);
 172         }
 173
 174         if (is_size_safe_to_change(cifsInfo)) {
 175                 /* can not safely change the file size here if the
 176                 client is writing to it due to potential races */
 177                 i_size_write(tmp_inode, end_of_file);
 178
 179         /* 512 bytes (2**9) is the fake blocksize that must be used */
 180         /* for this calculation, even though the reported blocksize is larger */
 181                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 182         }
 183
 184         if (allocation_size < end_of_file)
 185                 cFYI(1, ("May be sparse file, allocation less than file size"));
 186         cFYI(1,
 187              ("File Size %ld and blocks %ld and blocksize %ld",
 188               (unsigned long)tmp_inode->i_size, tmp_inode->i_blocks,
 189               tmp_inode->i_blksize));
 190         if (S_ISREG(tmp_inode->i_mode)) {
 191                 cFYI(1, ("File inode"));
 192                 tmp_inode->i_op = &cifs_file_inode_ops;
 193                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 194                         tmp_inode->i_fop = &cifs_file_direct_ops;
 195                 else
 196                         tmp_inode->i_fop = &cifs_file_ops;
 197                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 198
 199                 if(isNewInode)
 200                         return; /* No sense invalidating pages for new inode
 201                                    since have not started caching readahead file
 202                                    data yet */
 203
 204                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 205                         (local_size == tmp_inode->i_size)) {
 206                         cFYI(1, ("inode exists but unchanged"));
 207                 } else {
 208                         /* file may have changed on server */
 209                         cFYI(1, ("invalidate inode, readdir detected change"));
 210                         invalidate_remote_inode(tmp_inode);
 211                 }
 212         } else if (S_ISDIR(tmp_inode->i_mode)) {
 213                 cFYI(1, ("Directory inode"));
 214                 tmp_inode->i_op = &cifs_dir_inode_ops;
 215                 tmp_inode->i_fop = &cifs_dir_ops;
 216         } else if (S_ISLNK(tmp_inode->i_mode)) {
 217                 cFYI(1, ("Symbolic Link inode"));
 218                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 219         } else {
 220                 cFYI(1, ("Init special inode"));
 221                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 222                                    tmp_inode->i_rdev);
 223         }
 224 }
 225
 226 static void unix_fill_in_inode(struct inode *tmp_inode,
 227         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 228 {
 229         loff_t local_size;
 230         struct timespec local_mtime;
 231
 232         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 233         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 234
 235         __u32 type = le32_to_cpu(pfindData->Type);
 236         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 237         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 238         cifsInfo->time = jiffies;
 239         atomic_inc(&cifsInfo->inUse);
 240
 241         /* save mtime and size */
 242         local_mtime = tmp_inode->i_mtime;
 243         local_size  = tmp_inode->i_size;
 244
 245         tmp_inode->i_atime =
 246             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 247         tmp_inode->i_mtime =
 248             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 249         tmp_inode->i_ctime =
 250             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 251
 252         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 253         if (type == UNIX_FILE) {
 254                 *pobject_type = DT_REG;
 255                 tmp_inode->i_mode |= S_IFREG;
 256         } else if (type == UNIX_SYMLINK) {
 257                 *pobject_type = DT_LNK;
 258                 tmp_inode->i_mode |= S_IFLNK;
 259         } else if (type == UNIX_DIR) {
 260                 *pobject_type = DT_DIR;
 261                 tmp_inode->i_mode |= S_IFDIR;
 262         } else if (type == UNIX_CHARDEV) {
 263                 *pobject_type = DT_CHR;
 264                 tmp_inode->i_mode |= S_IFCHR;
 265                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 266                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 267         } else if (type == UNIX_BLOCKDEV) {
 268                 *pobject_type = DT_BLK;
 269                 tmp_inode->i_mode |= S_IFBLK;
 270                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 271                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 272         } else if (type == UNIX_FIFO) {
 273                 *pobject_type = DT_FIFO;
 274                 tmp_inode->i_mode |= S_IFIFO;
 275         } else if (type == UNIX_SOCKET) {
 276                 *pobject_type = DT_SOCK;
 277                 tmp_inode->i_mode |= S_IFSOCK;
 278         }
 279
 280         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 281         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 282         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 283
 284         if (is_size_safe_to_change(cifsInfo)) {
 285                 /* can not safely change the file size here if the
 286                 client is writing to it due to potential races */
 287                 i_size_write(tmp_inode,end_of_file);
 288
 289         /* 512 bytes (2**9) is the fake blocksize that must be used */
 290         /* for this calculation, not the real blocksize */
 291                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 292         }
 293
 294         if (S_ISREG(tmp_inode->i_mode)) {
 295                 cFYI(1, ("File inode"));
 296                 tmp_inode->i_op = &cifs_file_inode_ops;
 297                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 298                         tmp_inode->i_fop = &cifs_file_direct_ops;
 299                 else
 300                         tmp_inode->i_fop = &cifs_file_ops;
 301                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 302
 303                 if(isNewInode)
 304                         return; /* No sense invalidating pages for new inode since we
 305                                            have not started caching readahead file data yet */
 306
 307                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 308                         (local_size == tmp_inode->i_size)) {
 309                         cFYI(1, ("inode exists but unchanged"));
 310                 } else {
 311                         /* file may have changed on server */
 312                         cFYI(1, ("invalidate inode, readdir detected change"));
 313                         invalidate_remote_inode(tmp_inode);
 314                 }
 315         } else if (S_ISDIR(tmp_inode->i_mode)) {
 316                 cFYI(1, ("Directory inode"));
 317                 tmp_inode->i_op = &cifs_dir_inode_ops;
 318                 tmp_inode->i_fop = &cifs_dir_ops;
 319         } else if (S_ISLNK(tmp_inode->i_mode)) {
 320                 cFYI(1, ("Symbolic Link inode"));
 321                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 322 /* tmp_inode->i_fop = *//* do not need to set to anything */
 323         } else {
 324                 cFYI(1, ("Special inode"));
 325                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 326                                    tmp_inode->i_rdev);
 327         }
 328 }
 329
 330 static int initiate_cifs_search(const int xid, struct file *file)
 331 {
 332         int rc = 0;
 333         char * full_path;
 334         struct cifsFileInfo * cifsFile;
 335         struct cifs_sb_info *cifs_sb;
 336         struct cifsTconInfo *pTcon;
 337
 338         if(file->private_data == NULL) {
 339                 file->private_data =
 340                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 341         }
 342
 343         if(file->private_data == NULL) {
 344                 return -ENOMEM;
 345         } else {
 346                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 347         }
 348         cifsFile = file->private_data;
 349         cifsFile->invalidHandle = TRUE;
 350         cifsFile->srch_inf.endOfSearch = FALSE;
 351
 352         if(file->f_dentry == NULL)
 353                 return -ENOENT;
 354
 355         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 356         if(cifs_sb == NULL)
 357                 return -EINVAL;
 358
 359         pTcon = cifs_sb->tcon;
 360         if(pTcon == NULL)
 361                 return -EINVAL;
 362
 363         down(&file->f_dentry->d_sb->s_vfs_rename_sem);
 364         full_path = build_path_from_dentry(file->f_dentry, cifs_sb);
 365         up(&file->f_dentry->d_sb->s_vfs_rename_sem);
 366
 367         if(full_path == NULL) {
 368                 return -ENOMEM;
 369         }
 370
 371         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 372
 373 ffirst_retry:
 374         /* test for Unix extensions */
 375         if (pTcon->ses->capabilities & CAP_UNIX) {
 376                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 377         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 378                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 379         } else /* not srvinos - BB fixme add check for backlevel? */ {
 380                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 381         }
 382
 383         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 384                 &cifsFile->netfid, &cifsFile->srch_inf,
 385                 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 386         if(rc == 0)
 387                 cifsFile->invalidHandle = FALSE;
 388         if((rc == -EOPNOTSUPP) &&
 389                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 390                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 391                 goto ffirst_retry;
 392         }
 393         kfree(full_path);
 394         return rc;
 395 }
 396
 397 /* return length of unicode string in bytes */
 398 static int cifs_unicode_bytelen(char *str)
 399 {
 400         int len;
 401         __le16 * ustr = (__le16 *)str;
 402
 403         for(len=0;len <= PATH_MAX;len++) {
 404                 if(ustr[len] == 0)
 405                         return len << 1;
 406         }
 407         cFYI(1,("Unicode string longer than PATH_MAX found"));
 408         return len << 1;
 409 }
 410
 411 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
 412 {
 413         char * new_entry;
 414         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 415
 416         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 417         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 418         /* validate that new_entry is not past end of SMB */
 419         if(new_entry >= end_of_smb) {
 420                 cERROR(1,
 421                       ("search entry %p began after end of SMB %p old entry %p",
 422                         new_entry, end_of_smb, old_entry));
 423                 return NULL;
 424         } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
 425                 cERROR(1,("search entry %p extends after end of SMB %p",
 426                         new_entry, end_of_smb));
 427                 return NULL;
 428         } else
 429                 return new_entry;
 430
 431 }
 432
 433 #define UNICODE_DOT cpu_to_le16(0x2e)
 434
 435 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 436 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 437 {
 438         int rc = 0;
 439         char * filename = NULL;
 440         int len = 0;
 441
 442         if(cfile->srch_inf.info_level == 0x202) {
 443                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 444                 filename = &pFindData->FileName[0];
 445                 if(cfile->srch_inf.unicode) {
 446                         len = cifs_unicode_bytelen(filename);
 447                 } else {
 448                         /* BB should we make this strnlen of PATH_MAX? */
 449                         len = strnlen(filename, 5);
 450                 }
 451         } else if(cfile->srch_inf.info_level == 0x101) {
 452                 FILE_DIRECTORY_INFO * pFindData =
 453                         (FILE_DIRECTORY_INFO *)current_entry;
 454                 filename = &pFindData->FileName[0];
 455                 len = le32_to_cpu(pFindData->FileNameLength);
 456         } else if(cfile->srch_inf.info_level == 0x102) {
 457                 FILE_FULL_DIRECTORY_INFO * pFindData =
 458                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 459                 filename = &pFindData->FileName[0];
 460                 len = le32_to_cpu(pFindData->FileNameLength);
 461         } else if(cfile->srch_inf.info_level == 0x105) {
 462                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 463                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 464                 filename = &pFindData->FileName[0];
 465                 len = le32_to_cpu(pFindData->FileNameLength);
 466         } else if(cfile->srch_inf.info_level == 0x104) {
 467                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 468                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 469                 filename = &pFindData->FileName[0];
 470                 len = le32_to_cpu(pFindData->FileNameLength);
 471         } else {
 472                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 473         }
 474
 475         if(filename) {
 476                 if(cfile->srch_inf.unicode) {
 477                         __le16 *ufilename = (__le16 *)filename;
 478                         if(len == 2) {
 479                                 /* check for . */
 480                                 if(ufilename[0] == UNICODE_DOT)
 481                                         rc = 1;
 482                         } else if(len == 4) {
 483                                 /* check for .. */
 484                                 if((ufilename[0] == UNICODE_DOT)
 485                                    &&(ufilename[1] == UNICODE_DOT))
 486                                         rc = 2;
 487                         }
 488                 } else /* ASCII */ {
 489                         if(len == 1) {
 490                                 if(filename[0] == '.')
 491                                         rc = 1;
 492                         } else if(len == 2) {
 493                                 if((filename[0] == '.') && (filename[1] == '.'))
 494                                         rc = 2;
 495                         }
 496                 }
 497         }
 498
 499         return rc;
 500 }
 501
 502 /* find the corresponding entry in the search */
 503 /* Note that the SMB server returns search entries for . and .. which
 504    complicates logic here if we choose to parse for them and we do not
 505    assume that they are located in the findfirst return buffer.*/
 506 /* We start counting in the buffer with entry 2 and increment for every
 507    entry (do not increment for . or .. entry) */
 508 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 509         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 510 {
 511         int rc = 0;
 512         int pos_in_buf = 0;
 513         loff_t first_entry_in_buffer;
 514         loff_t index_to_find = file->f_pos;
 515         struct cifsFileInfo * cifsFile = file->private_data;
 516         /* check if index in the buffer */
 517
 518         if((cifsFile == NULL) || (ppCurrentEntry == NULL) || (num_to_ret == NULL))
 519                 return -ENOENT;
 520
 521         *ppCurrentEntry = NULL;
 522         first_entry_in_buffer =
 523                 cifsFile->srch_inf.index_of_last_entry -
 524                         cifsFile->srch_inf.entries_in_buffer;
 525 /*      dump_cifs_file_struct(file, "In fce ");*/
 526         if(index_to_find < first_entry_in_buffer) {
 527                 /* close and restart search */
 528                 cFYI(1,("search backing up - close and restart search"));
 529                 cifsFile->invalidHandle = TRUE;
 530                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 531                 kfree(cifsFile->search_resume_name);
 532                 cifsFile->search_resume_name = NULL;
 533                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 534                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 535                         cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
 536                 }
 537                 rc = initiate_cifs_search(xid,file);
 538                 if(rc) {
 539                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 540                         return rc;
 541                 }
 542         }
 543
 544         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 545               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 546                 cFYI(1,("calling findnext2"));
 547                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 548                                   &cifsFile->srch_inf);
 549                 if(rc)
 550                         return -ENOENT;
 551         }
 552         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 553                 /* we found the buffer that contains the entry */
 554                 /* scan and find it */
 555                 int i;
 556                 char * current_entry;
 557                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 558                         smbCalcSize((struct smb_hdr *)
 559                                 cifsFile->srch_inf.ntwrk_buf_start);
 560 /*      dump_cifs_file_struct(file,"found entry in fce "); */
 561                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 562                                         - cifsFile->srch_inf.entries_in_buffer;
 563                 pos_in_buf = index_to_find - first_entry_in_buffer;
 564                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 565                 current_entry = cifsFile->srch_inf.srch_entries_start;
 566                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 567                         /* go entry by entry figuring out which is first */
 568                         /* if( . or ..)
 569                                 skip */
 570                         rc = cifs_entry_is_dot(current_entry,cifsFile);
 571                         if(rc == 1) /* is . or .. so skip */ {
 572                                 cFYI(1,("Entry is .")); /* BB removeme BB */
 573                                 /* continue; */
 574                         } else if (rc == 2 ) {
 575                                 cFYI(1,("Entry is ..")); /* BB removeme BB */
 576                                 /* continue; */
 577                         }
 578                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
 579                 }
 580                 if((current_entry == NULL) && (i < pos_in_buf)) {
 581                         /* BB fixme - check if we should flag this error */
 582                         cERROR(1,("reached end of buf searching for pos in buf"
 583                           " %d index to find %lld rc %d",
 584                           pos_in_buf,index_to_find,rc));
 585                 }
 586                 rc = 0;
 587                 *ppCurrentEntry = current_entry;
 588         } else {
 589                 cFYI(1,("index not in buffer - could not findnext into it"));
 590                 return 0;
 591         }
 592
 593         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 594                 cFYI(1,("can not return entries when pos_in_buf beyond last entry"));
 595                 *num_to_ret = 0;
 596         } else
 597                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 598 /*      dump_cifs_file_struct(file, "end fce ");*/
 599
 600         return rc;
 601 }
 602
 603 /* inode num, inode type and filename returned */
 604 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 605         char *current_entry, __u16 level, unsigned int unicode,
 606         struct cifs_sb_info * cifs_sb, ino_t *pinum)
 607 {
 608         int rc = 0;
 609         unsigned int len = 0;
 610         char * filename;
 611         struct nls_table * nlt = cifs_sb->local_nls;
 612
 613         *pinum = 0;
 614
 615         if(level == SMB_FIND_FILE_UNIX) {
 616                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 617
 618                 filename = &pFindData->FileName[0];
 619                 if(unicode) {
 620                         len = cifs_unicode_bytelen(filename);
 621                 } else {
 622                         /* BB should we make this strnlen of PATH_MAX? */
 623                         len = strnlen(filename, PATH_MAX);
 624                 }
 625
 626                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 627                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 628                         *pinum = pFindData->UniqueId;
 629         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 630                 FILE_DIRECTORY_INFO * pFindData =
 631                         (FILE_DIRECTORY_INFO *)current_entry;
 632                 filename = &pFindData->FileName[0];
 633                 len = le32_to_cpu(pFindData->FileNameLength);
 634         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 635                 FILE_FULL_DIRECTORY_INFO * pFindData =
 636                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 637                 filename = &pFindData->FileName[0];
 638                 len = le32_to_cpu(pFindData->FileNameLength);
 639         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 640                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 641                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 642                 filename = &pFindData->FileName[0];
 643                 len = le32_to_cpu(pFindData->FileNameLength);
 644                 *pinum = pFindData->UniqueId;
 645         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 646                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 647                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 648                 filename = &pFindData->FileName[0];
 649                 len = le32_to_cpu(pFindData->FileNameLength);
 650         } else {
 651                 cFYI(1,("Unknown findfirst level %d",level));
 652                 return -EINVAL;
 653         }
 654         if(unicode) {
 655                 /* BB fixme - test with long names */
 656                 /* Note converted filename can be longer than in unicode */
 657                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 658                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 659                                         (__le16 *)filename, len/2, nlt);
 660                 else
 661                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 662                                         (wchar_t *)filename,len/2,nlt);
 663         } else {
 664                 pqst->name = filename;
 665                 pqst->len = len;
 666         }
 667         pqst->hash = full_name_hash(pqst->name,pqst->len);
 668 /*      cFYI(1,("filldir on %s",pqst->name));  */
 669         return rc;
 670 }
 671
 672 static int cifs_filldir(char *pfindEntry, struct file *file,
 673         filldir_t filldir, void *direntry, char *scratch_buf)
 674 {
 675         int rc = 0;
 676         struct qstr qstring;
 677         struct cifsFileInfo * pCifsF;
 678         unsigned obj_type;
 679         ino_t  inum;
 680         struct cifs_sb_info * cifs_sb;
 681         struct inode *tmp_inode;
 682         struct dentry *tmp_dentry;
 683
 684         /* get filename and len into qstring */
 685         /* get dentry */
 686         /* decide whether to create and populate ionde */
 687         if((direntry == NULL) || (file == NULL))
 688                 return -EINVAL;
 689
 690         pCifsF = file->private_data;
 691
 692         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 693                 return -ENOENT;
 694
 695         if(file->f_dentry == NULL)
 696                 return -ENOENT;
 697
 698         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 699
 700         qstring.name = scratch_buf;
 701         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 702                         pCifsF->srch_inf.info_level,
 703                         pCifsF->srch_inf.unicode,cifs_sb,
 704                         &inum /* returned */);
 705
 706         if(rc)
 707                 return rc;
 708
 709         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 710         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 711                 return -ENOMEM;
 712
 713         if(rc) {
 714                 /* inode created, we need to hash it with right inode number */
 715                 if(inum != 0) {
 716                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 717                         tmp_inode->i_ino = inum;
 718                 }
 719                 insert_inode_hash(tmp_inode);
 720         }
 721
 722         /* we pass in rc below, indicating whether it is a new inode,
 723            so we can figure out whether to invalidate the inode cached
 724            data if the file has changed */
 725         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 726                 unix_fill_in_inode(tmp_inode,
 727                                    (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
 728         } else {
 729                 fill_in_inode(tmp_inode,
 730                               (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
 731         }
 732
 733         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 734                      tmp_inode->i_ino,obj_type);
 735         if(rc) {
 736                 cFYI(1,("filldir rc = %d",rc));
 737         }
 738
 739         dput(tmp_dentry);
 740         return rc;
 741 }
 742
 743 static int cifs_save_resume_key(const char *current_entry,
 744         struct cifsFileInfo *cifsFile)
 745 {
 746         int rc = 0;
 747         unsigned int len = 0;
 748         __u16 level;
 749         char * filename;
 750
 751         if((cifsFile == NULL) || (current_entry == NULL))
 752                 return -EINVAL;
 753
 754         level = cifsFile->srch_inf.info_level;
 755
 756         if(level == SMB_FIND_FILE_UNIX) {
 757                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 758
 759                 filename = &pFindData->FileName[0];
 760                 if(cifsFile->srch_inf.unicode) {
 761                         len = cifs_unicode_bytelen(filename);
 762                 } else {
 763                         /* BB should we make this strnlen of PATH_MAX? */
 764                         len = strnlen(filename, PATH_MAX);
 765                 }
 766                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 767         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 768                 FILE_DIRECTORY_INFO * pFindData =
 769                         (FILE_DIRECTORY_INFO *)current_entry;
 770                 filename = &pFindData->FileName[0];
 771                 len = le32_to_cpu(pFindData->FileNameLength);
 772                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 773         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 774                 FILE_FULL_DIRECTORY_INFO * pFindData =
 775                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 776                 filename = &pFindData->FileName[0];
 777                 len = le32_to_cpu(pFindData->FileNameLength);
 778                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 779         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 780                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 781                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 782                 filename = &pFindData->FileName[0];
 783                 len = le32_to_cpu(pFindData->FileNameLength);
 784                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 785         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 786                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 787                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 788                 filename = &pFindData->FileName[0];
 789                 len = le32_to_cpu(pFindData->FileNameLength);
 790                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 791         } else {
 792                 cFYI(1,("Unknown findfirst level %d",level));
 793                 return -EINVAL;
 794         }
 795         cifsFile->srch_inf.resume_name_len = len;
 796         cifsFile->srch_inf.presume_name = filename;
 797         return rc;
 798 }
 799
 800 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 801 {
 802         int rc = 0;
 803         int xid,i;
 804         struct cifs_sb_info *cifs_sb;
 805         struct cifsTconInfo *pTcon;
 806         struct cifsFileInfo *cifsFile = NULL;
 807         char * current_entry;
 808         int num_to_fill = 0;
 809         char * tmp_buf = NULL;
 810         char * end_of_smb;
 811
 812         xid = GetXid();
 813
 814         if(file->f_dentry == NULL) {
 815                 FreeXid(xid);
 816                 return -EIO;
 817         }
 818 /*      dump_cifs_file_struct(file, "Begin rdir "); */
 819
 820         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 821         pTcon = cifs_sb->tcon;
 822         if(pTcon == NULL)
 823                 return -EINVAL;
 824
 825 /*      cFYI(1,("readdir2 pos: %lld",file->f_pos)); */
 826
 827         switch ((int) file->f_pos) {
 828         case 0:
 829                 /*if (filldir(direntry, ".", 1, file->f_pos,
 830                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 831                         cERROR(1, ("Filldir for current dir failed "));
 832                         rc = -ENOMEM;
 833                         break;
 834                 }
 835                 file->f_pos++; */
 836         case 1:
 837                 /* if (filldir(direntry, "..", 2, file->f_pos,
 838                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 839                         cERROR(1, ("Filldir for parent dir failed "));
 840                         rc = -ENOMEM;
 841                         break;
 842                 }
 843                 file->f_pos++; */
 844         case 2:
 845                 /* 1) If search is active,
 846                         is in current search buffer?
 847                         if it before then restart search
 848                         if after then keep searching till find it */
 849
 850                 if(file->private_data == NULL) {
 851                         rc = initiate_cifs_search(xid,file);
 852                         cFYI(1,("initiate cifs search rc %d",rc));
 853                         if(rc) {
 854                                 FreeXid(xid);
 855                                 return rc;
 856                         }
 857                 }
 858         default:
 859                 if(file->private_data == NULL) {
 860                         rc = -EINVAL;
 861                         FreeXid(xid);
 862                         return rc;
 863                 }
 864                 cifsFile = file->private_data;
 865                 if (cifsFile->srch_inf.endOfSearch) {
 866                         if(cifsFile->srch_inf.emptyDir) {
 867                                 cFYI(1, ("End of search, empty dir"));
 868                                 rc = 0;
 869                                 break;
 870                         }
 871                 } /* else {
 872                         cifsFile->invalidHandle = TRUE;
 873                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 874                 }
 875                 kfree(cifsFile->search_resume_name);
 876                 cifsFile->search_resume_name = NULL; */
 877
 878                 /* BB account for . and .. in f_pos as special case */
 879                 /* dump_cifs_file_struct(file, "rdir after default ");*/
 880
 881                 rc = find_cifs_entry(xid,pTcon, file,
 882                                 &current_entry,&num_to_fill);
 883                 if(rc) {
 884                         cFYI(1,("fce error %d",rc));
 885                         goto rddir2_exit;
 886                 } else if (current_entry != NULL) {
 887                         cFYI(1,("entry %lld found",file->f_pos));
 888                 } else {
 889                         cFYI(1,("could not find entry"));
 890                         goto rddir2_exit;
 891                 }
 892                 cFYI(1,("loop through %d times filling dir for net buf %p",
 893                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
 894                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 895                         smbCalcSize((struct smb_hdr *)
 896                                     cifsFile->srch_inf.ntwrk_buf_start);
 897                 /* To be safe - for UCS to UTF-8 with strings loaded
 898                 with the rare long characters alloc more to account for
 899                 such multibyte target UTF-8 characters. cifs_unicode.c,
 900                 which actually does the conversion, has the same limit */
 901                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
 902                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
 903                         if(current_entry == NULL) {
 904                                 /* evaluate whether this case is an error */
 905                                 cERROR(1,("past end of SMB num to fill %d i %d",
 906                                           num_to_fill, i));
 907                                 break;
 908                         }
 909
 910                         rc = cifs_filldir(current_entry, file,
 911                                         filldir, direntry,tmp_buf);
 912                         file->f_pos++;
 913                         if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
 914                                 cFYI(1,("last entry in buf at pos %lld %s",
 915                                         file->f_pos,tmp_buf)); /* BB removeme BB */
 916                                 cifs_save_resume_key(current_entry,cifsFile);
 917                                 break;
 918                         } else
 919                                 current_entry = nxt_dir_entry(current_entry,
 920                                                               end_of_smb);
 921                 }
 922                 kfree(tmp_buf);
 923                 break;
 924         } /* end switch */
 925
 926 rddir2_exit:
 927         /* dump_cifs_file_struct(file, "end rdir ");  */
 928         FreeXid(xid);
 929         return rc;
 930 }