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