err.no Git - linux-2.6/blob - fs/cifs/readdir.c

   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004, 2005
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <linux/fs.h>
  24 #include <linux/stat.h>
  25 #include <linux/smp_lock.h>
  26 #include "cifspdu.h"
  27 #include "cifsglob.h"
  28 #include "cifsproto.h"
  29 #include "cifs_unicode.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_fs_sb.h"
  32 #include "cifsfs.h"
  33
  34 /* BB fixme - add debug wrappers around this function to disable it fixme BB */
  35 /* static void dump_cifs_file_struct(struct file *file, char *label)
  36 {
  37         struct cifsFileInfo * cf;
  38
  39         if(file) {
  40                 cf = file->private_data;
  41                 if(cf == NULL) {
  42                         cFYI(1,("empty cifs private file data"));
  43                         return;
  44                 }
  45                 if(cf->invalidHandle) {
  46                         cFYI(1,("invalid handle"));
  47                 }
  48                 if(cf->srch_inf.endOfSearch) {
  49                         cFYI(1,("end of search"));
  50                 }
  51                 if(cf->srch_inf.emptyDir) {
  52                         cFYI(1,("empty dir"));
  53                 }
  54
  55         }
  56 } */
  57
  58 /* Returns one if new inode created (which therefore needs to be hashed) */
  59 /* Might check in the future if inode number changed so we can rehash inode */
  60 static int construct_dentry(struct qstr *qstring, struct file *file,
  61         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  62 {
  63         struct dentry *tmp_dentry;
  64         struct cifs_sb_info *cifs_sb;
  65         struct cifsTconInfo *pTcon;
  66         int rc = 0;
  67
  68         cFYI(1, ("For %s", qstring->name));
  69         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
  70         pTcon = cifs_sb->tcon;
  71
  72         qstring->hash = full_name_hash(qstring->name, qstring->len);
  73         tmp_dentry = d_lookup(file->f_dentry, qstring);
  74         if (tmp_dentry) {
  75                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
  76                 *ptmp_inode = tmp_dentry->d_inode;
  77 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
  78                 if(*ptmp_inode == NULL) {
  79                         *ptmp_inode = new_inode(file->f_dentry->d_sb);
  80                         if(*ptmp_inode == NULL)
  81                                 return rc;
  82                         rc = 1;
  83                         d_instantiate(tmp_dentry, *ptmp_inode);
  84                 }
  85         } else {
  86                 tmp_dentry = d_alloc(file->f_dentry, qstring);
  87                 if(tmp_dentry == NULL) {
  88                         cERROR(1,("Failed allocating dentry"));
  89                         *ptmp_inode = NULL;
  90                         return rc;
  91                 }
  92
  93                 *ptmp_inode = new_inode(file->f_dentry->d_sb);
  94                 if (pTcon->nocase)
  95                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
  96                 else
  97                         tmp_dentry->d_op = &cifs_dentry_ops;
  98                 if(*ptmp_inode == NULL)
  99                         return rc;
 100                 rc = 1;
 101                 d_instantiate(tmp_dentry, *ptmp_inode);
 102                 d_rehash(tmp_dentry);
 103         }
 104
 105         tmp_dentry->d_time = jiffies;
 106         *pnew_dentry = tmp_dentry;
 107         return rc;
 108 }
 109
 110 static void fill_in_inode(struct inode *tmp_inode,
 111         FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
 112 {
 113         loff_t local_size;
 114         struct timespec local_mtime;
 115
 116         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 117         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 118         __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 119         __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 120         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 121
 122         cifsInfo->cifsAttrs = attr;
 123         cifsInfo->time = jiffies;
 124
 125         /* save mtime and size */
 126         local_mtime = tmp_inode->i_mtime;
 127         local_size  = tmp_inode->i_size;
 128
 129         /* Linux can not store file creation time unfortunately so ignore it */
 130         tmp_inode->i_atime =
 131             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 132         tmp_inode->i_mtime =
 133             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 134         tmp_inode->i_ctime =
 135             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 136         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 137         /* 2767 perms - indicate mandatory locking */
 138                 /* BB fill in uid and gid here? with help from winbind?
 139                    or retrieve from NTFS stream extended attribute */
 140         if (atomic_read(&cifsInfo->inUse) == 0) {
 141                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 142                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 143                 /* set default mode. will override for dirs below */
 144                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 145         }
 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                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 204                    (cifs_sb->tcon->ses->server->maxBuf <
 205                         4096 + MAX_CIFS_HDR_SIZE))
 206                         tmp_inode->i_data.a_ops->readpages = NULL;
 207                 if(isNewInode)
 208                         return; /* No sense invalidating pages for new inode
 209                                    since have not started caching readahead file
 210                                    data yet */
 211
 212                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 213                         (local_size == tmp_inode->i_size)) {
 214                         cFYI(1, ("inode exists but unchanged"));
 215                 } else {
 216                         /* file may have changed on server */
 217                         cFYI(1, ("invalidate inode, readdir detected change"));
 218                         invalidate_remote_inode(tmp_inode);
 219                 }
 220         } else if (S_ISDIR(tmp_inode->i_mode)) {
 221                 cFYI(1, ("Directory inode"));
 222                 tmp_inode->i_op = &cifs_dir_inode_ops;
 223                 tmp_inode->i_fop = &cifs_dir_ops;
 224         } else if (S_ISLNK(tmp_inode->i_mode)) {
 225                 cFYI(1, ("Symbolic Link inode"));
 226                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 227         } else {
 228                 cFYI(1, ("Init special inode"));
 229                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 230                                    tmp_inode->i_rdev);
 231         }
 232 }
 233
 234 static void unix_fill_in_inode(struct inode *tmp_inode,
 235         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 236 {
 237         loff_t local_size;
 238         struct timespec local_mtime;
 239
 240         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 241         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 242
 243         __u32 type = le32_to_cpu(pfindData->Type);
 244         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 245         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 246         cifsInfo->time = jiffies;
 247         atomic_inc(&cifsInfo->inUse);
 248
 249         /* save mtime and size */
 250         local_mtime = tmp_inode->i_mtime;
 251         local_size  = tmp_inode->i_size;
 252
 253         tmp_inode->i_atime =
 254             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 255         tmp_inode->i_mtime =
 256             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 257         tmp_inode->i_ctime =
 258             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 259
 260         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 261         if (type == UNIX_FILE) {
 262                 *pobject_type = DT_REG;
 263                 tmp_inode->i_mode |= S_IFREG;
 264         } else if (type == UNIX_SYMLINK) {
 265                 *pobject_type = DT_LNK;
 266                 tmp_inode->i_mode |= S_IFLNK;
 267         } else if (type == UNIX_DIR) {
 268                 *pobject_type = DT_DIR;
 269                 tmp_inode->i_mode |= S_IFDIR;
 270         } else if (type == UNIX_CHARDEV) {
 271                 *pobject_type = DT_CHR;
 272                 tmp_inode->i_mode |= S_IFCHR;
 273                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 274                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 275         } else if (type == UNIX_BLOCKDEV) {
 276                 *pobject_type = DT_BLK;
 277                 tmp_inode->i_mode |= S_IFBLK;
 278                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 279                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 280         } else if (type == UNIX_FIFO) {
 281                 *pobject_type = DT_FIFO;
 282                 tmp_inode->i_mode |= S_IFIFO;
 283         } else if (type == UNIX_SOCKET) {
 284                 *pobject_type = DT_SOCK;
 285                 tmp_inode->i_mode |= S_IFSOCK;
 286         }
 287
 288         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 289         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 290         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 291
 292         if (is_size_safe_to_change(cifsInfo)) {
 293                 /* can not safely change the file size here if the
 294                 client is writing to it due to potential races */
 295                 i_size_write(tmp_inode,end_of_file);
 296
 297         /* 512 bytes (2**9) is the fake blocksize that must be used */
 298         /* for this calculation, not the real blocksize */
 299                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 300         }
 301
 302         if (S_ISREG(tmp_inode->i_mode)) {
 303                 cFYI(1, ("File inode"));
 304                 tmp_inode->i_op = &cifs_file_inode_ops;
 305                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 306                         tmp_inode->i_fop = &cifs_file_direct_ops;
 307                 else
 308                         tmp_inode->i_fop = &cifs_file_ops;
 309                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 310                         tmp_inode->i_fop->lock = NULL;
 311                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 312                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 313                    (cifs_sb->tcon->ses->server->maxBuf <
 314                         4096 + MAX_CIFS_HDR_SIZE))
 315                         tmp_inode->i_data.a_ops->readpages = NULL;
 316
 317                 if(isNewInode)
 318                         return; /* No sense invalidating pages for new inode since we
 319                                            have not started caching readahead file data yet */
 320
 321                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 322                         (local_size == tmp_inode->i_size)) {
 323                         cFYI(1, ("inode exists but unchanged"));
 324                 } else {
 325                         /* file may have changed on server */
 326                         cFYI(1, ("invalidate inode, readdir detected change"));
 327                         invalidate_remote_inode(tmp_inode);
 328                 }
 329         } else if (S_ISDIR(tmp_inode->i_mode)) {
 330                 cFYI(1, ("Directory inode"));
 331                 tmp_inode->i_op = &cifs_dir_inode_ops;
 332                 tmp_inode->i_fop = &cifs_dir_ops;
 333         } else if (S_ISLNK(tmp_inode->i_mode)) {
 334                 cFYI(1, ("Symbolic Link inode"));
 335                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 336 /* tmp_inode->i_fop = *//* do not need to set to anything */
 337         } else {
 338                 cFYI(1, ("Special inode"));
 339                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 340                                    tmp_inode->i_rdev);
 341         }
 342 }
 343
 344 static int initiate_cifs_search(const int xid, struct file *file)
 345 {
 346         int rc = 0;
 347         char * full_path;
 348         struct cifsFileInfo * cifsFile;
 349         struct cifs_sb_info *cifs_sb;
 350         struct cifsTconInfo *pTcon;
 351
 352         if(file->private_data == NULL) {
 353                 file->private_data =
 354                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 355         }
 356
 357         if(file->private_data == NULL) {
 358                 return -ENOMEM;
 359         } else {
 360                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 361         }
 362         cifsFile = file->private_data;
 363         cifsFile->invalidHandle = TRUE;
 364         cifsFile->srch_inf.endOfSearch = FALSE;
 365
 366         if(file->f_dentry == NULL)
 367                 return -ENOENT;
 368
 369         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 370         if(cifs_sb == NULL)
 371                 return -EINVAL;
 372
 373         pTcon = cifs_sb->tcon;
 374         if(pTcon == NULL)
 375                 return -EINVAL;
 376
 377         down(&file->f_dentry->d_sb->s_vfs_rename_sem);
 378         full_path = build_path_from_dentry(file->f_dentry);
 379         up(&file->f_dentry->d_sb->s_vfs_rename_sem);
 380
 381         if(full_path == NULL) {
 382                 return -ENOMEM;
 383         }
 384
 385         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 386
 387 ffirst_retry:
 388         /* test for Unix extensions */
 389         if (pTcon->ses->capabilities & CAP_UNIX) {
 390                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 391         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 392                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 393         } else /* not srvinos - BB fixme add check for backlevel? */ {
 394                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 395         }
 396
 397         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 398                 &cifsFile->netfid, &cifsFile->srch_inf,
 399                 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 400         if(rc == 0)
 401                 cifsFile->invalidHandle = FALSE;
 402         if((rc == -EOPNOTSUPP) &&
 403                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 404                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 405                 goto ffirst_retry;
 406         }
 407         kfree(full_path);
 408         return rc;
 409 }
 410
 411 /* return length of unicode string in bytes */
 412 static int cifs_unicode_bytelen(char *str)
 413 {
 414         int len;
 415         __le16 * ustr = (__le16 *)str;
 416
 417         for(len=0;len <= PATH_MAX;len++) {
 418                 if(ustr[len] == 0)
 419                         return len << 1;
 420         }
 421         cFYI(1,("Unicode string longer than PATH_MAX found"));
 422         return len << 1;
 423 }
 424
 425 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
 426 {
 427         char * new_entry;
 428         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 429
 430         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 431         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 432         /* validate that new_entry is not past end of SMB */
 433         if(new_entry >= end_of_smb) {
 434                 cERROR(1,
 435                       ("search entry %p began after end of SMB %p old entry %p",
 436                         new_entry, end_of_smb, old_entry));
 437                 return NULL;
 438         } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
 439                 cERROR(1,("search entry %p extends after end of SMB %p",
 440                         new_entry, end_of_smb));
 441                 return NULL;
 442         } else
 443                 return new_entry;
 444
 445 }
 446
 447 #define UNICODE_DOT cpu_to_le16(0x2e)
 448
 449 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 450 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 451 {
 452         int rc = 0;
 453         char * filename = NULL;
 454         int len = 0;
 455
 456         if(cfile->srch_inf.info_level == 0x202) {
 457                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 458                 filename = &pFindData->FileName[0];
 459                 if(cfile->srch_inf.unicode) {
 460                         len = cifs_unicode_bytelen(filename);
 461                 } else {
 462                         /* BB should we make this strnlen of PATH_MAX? */
 463                         len = strnlen(filename, 5);
 464                 }
 465         } else if(cfile->srch_inf.info_level == 0x101) {
 466                 FILE_DIRECTORY_INFO * pFindData =
 467                         (FILE_DIRECTORY_INFO *)current_entry;
 468                 filename = &pFindData->FileName[0];
 469                 len = le32_to_cpu(pFindData->FileNameLength);
 470         } else if(cfile->srch_inf.info_level == 0x102) {
 471                 FILE_FULL_DIRECTORY_INFO * pFindData =
 472                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 473                 filename = &pFindData->FileName[0];
 474                 len = le32_to_cpu(pFindData->FileNameLength);
 475         } else if(cfile->srch_inf.info_level == 0x105) {
 476                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 477                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 478                 filename = &pFindData->FileName[0];
 479                 len = le32_to_cpu(pFindData->FileNameLength);
 480         } else if(cfile->srch_inf.info_level == 0x104) {
 481                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 482                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 483                 filename = &pFindData->FileName[0];
 484                 len = le32_to_cpu(pFindData->FileNameLength);
 485         } else {
 486                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 487         }
 488
 489         if(filename) {
 490                 if(cfile->srch_inf.unicode) {
 491                         __le16 *ufilename = (__le16 *)filename;
 492                         if(len == 2) {
 493                                 /* check for . */
 494                                 if(ufilename[0] == UNICODE_DOT)
 495                                         rc = 1;
 496                         } else if(len == 4) {
 497                                 /* check for .. */
 498                                 if((ufilename[0] == UNICODE_DOT)
 499                                    &&(ufilename[1] == UNICODE_DOT))
 500                                         rc = 2;
 501                         }
 502                 } else /* ASCII */ {
 503                         if(len == 1) {
 504                                 if(filename[0] == '.')
 505                                         rc = 1;
 506                         } else if(len == 2) {
 507                                 if((filename[0] == '.') && (filename[1] == '.'))
 508                                         rc = 2;
 509                         }
 510                 }
 511         }
 512
 513         return rc;
 514 }
 515
 516 /* find the corresponding entry in the search */
 517 /* Note that the SMB server returns search entries for . and .. which
 518    complicates logic here if we choose to parse for them and we do not
 519    assume that they are located in the findfirst return buffer.*/
 520 /* We start counting in the buffer with entry 2 and increment for every
 521    entry (do not increment for . or .. entry) */
 522 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 523         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 524 {
 525         int rc = 0;
 526         int pos_in_buf = 0;
 527         loff_t first_entry_in_buffer;
 528         loff_t index_to_find = file->f_pos;
 529         struct cifsFileInfo * cifsFile = file->private_data;
 530         /* check if index in the buffer */
 531
 532         if((cifsFile == NULL) || (ppCurrentEntry == NULL) || (num_to_ret == NULL))
 533                 return -ENOENT;
 534
 535         *ppCurrentEntry = NULL;
 536         first_entry_in_buffer =
 537                 cifsFile->srch_inf.index_of_last_entry -
 538                         cifsFile->srch_inf.entries_in_buffer;
 539 /*      dump_cifs_file_struct(file, "In fce ");*/
 540         if(index_to_find < first_entry_in_buffer) {
 541                 /* close and restart search */
 542                 cFYI(1,("search backing up - close and restart search"));
 543                 cifsFile->invalidHandle = TRUE;
 544                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 545                 kfree(cifsFile->search_resume_name);
 546                 cifsFile->search_resume_name = NULL;
 547                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 548                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 549                         cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
 550                 }
 551                 rc = initiate_cifs_search(xid,file);
 552                 if(rc) {
 553                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 554                         return rc;
 555                 }
 556         }
 557
 558         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 559               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 560                 cFYI(1,("calling findnext2"));
 561                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 562                                   &cifsFile->srch_inf);
 563                 if(rc)
 564                         return -ENOENT;
 565         }
 566         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 567                 /* we found the buffer that contains the entry */
 568                 /* scan and find it */
 569                 int i;
 570                 char * current_entry;
 571                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 572                         smbCalcSize((struct smb_hdr *)
 573                                 cifsFile->srch_inf.ntwrk_buf_start);
 574                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 575                                         - cifsFile->srch_inf.entries_in_buffer;
 576                 pos_in_buf = index_to_find - first_entry_in_buffer;
 577                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 578                 current_entry = cifsFile->srch_inf.srch_entries_start;
 579                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 580                         /* go entry by entry figuring out which is first */
 581                         /* if( . or ..)
 582                                 skip */
 583                         rc = cifs_entry_is_dot(current_entry,cifsFile);
 584                         if(rc == 1) /* is . or .. so skip */ {
 585                                 cFYI(1,("Entry is .")); /* BB removeme BB */
 586                                 /* continue; */
 587                         } else if (rc == 2 ) {
 588                                 cFYI(1,("Entry is ..")); /* BB removeme BB */
 589                                 /* continue; */
 590                         }
 591                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
 592                 }
 593                 if((current_entry == NULL) && (i < pos_in_buf)) {
 594                         /* BB fixme - check if we should flag this error */
 595                         cERROR(1,("reached end of buf searching for pos in buf"
 596                           " %d index to find %lld rc %d",
 597                           pos_in_buf,index_to_find,rc));
 598                 }
 599                 rc = 0;
 600                 *ppCurrentEntry = current_entry;
 601         } else {
 602                 cFYI(1,("index not in buffer - could not findnext into it"));
 603                 return 0;
 604         }
 605
 606         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 607                 cFYI(1,("can not return entries when pos_in_buf beyond last entry"));
 608                 *num_to_ret = 0;
 609         } else
 610                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 611
 612         return rc;
 613 }
 614
 615 /* inode num, inode type and filename returned */
 616 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 617         char *current_entry, __u16 level, unsigned int unicode,
 618         struct cifs_sb_info * cifs_sb, ino_t *pinum)
 619 {
 620         int rc = 0;
 621         unsigned int len = 0;
 622         char * filename;
 623         struct nls_table * nlt = cifs_sb->local_nls;
 624
 625         *pinum = 0;
 626
 627         if(level == SMB_FIND_FILE_UNIX) {
 628                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 629
 630                 filename = &pFindData->FileName[0];
 631                 if(unicode) {
 632                         len = cifs_unicode_bytelen(filename);
 633                 } else {
 634                         /* BB should we make this strnlen of PATH_MAX? */
 635                         len = strnlen(filename, PATH_MAX);
 636                 }
 637
 638                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 639                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 640                         *pinum = pFindData->UniqueId;
 641         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 642                 FILE_DIRECTORY_INFO * pFindData =
 643                         (FILE_DIRECTORY_INFO *)current_entry;
 644                 filename = &pFindData->FileName[0];
 645                 len = le32_to_cpu(pFindData->FileNameLength);
 646         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 647                 FILE_FULL_DIRECTORY_INFO * pFindData =
 648                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 649                 filename = &pFindData->FileName[0];
 650                 len = le32_to_cpu(pFindData->FileNameLength);
 651         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 652                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 653                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 654                 filename = &pFindData->FileName[0];
 655                 len = le32_to_cpu(pFindData->FileNameLength);
 656                 *pinum = pFindData->UniqueId;
 657         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 658                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 659                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 660                 filename = &pFindData->FileName[0];
 661                 len = le32_to_cpu(pFindData->FileNameLength);
 662         } else {
 663                 cFYI(1,("Unknown findfirst level %d",level));
 664                 return -EINVAL;
 665         }
 666         if(unicode) {
 667                 /* BB fixme - test with long names */
 668                 /* Note converted filename can be longer than in unicode */
 669                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 670                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 671                                         (__le16 *)filename, len/2, nlt);
 672                 else
 673                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 674                                         (wchar_t *)filename,len/2,nlt);
 675         } else {
 676                 pqst->name = filename;
 677                 pqst->len = len;
 678         }
 679         pqst->hash = full_name_hash(pqst->name,pqst->len);
 680 /*      cFYI(1,("filldir on %s",pqst->name));  */
 681         return rc;
 682 }
 683
 684 static int cifs_filldir(char *pfindEntry, struct file *file,
 685         filldir_t filldir, void *direntry, char *scratch_buf)
 686 {
 687         int rc = 0;
 688         struct qstr qstring;
 689         struct cifsFileInfo * pCifsF;
 690         unsigned obj_type;
 691         ino_t  inum;
 692         struct cifs_sb_info * cifs_sb;
 693         struct inode *tmp_inode;
 694         struct dentry *tmp_dentry;
 695
 696         /* get filename and len into qstring */
 697         /* get dentry */
 698         /* decide whether to create and populate ionde */
 699         if((direntry == NULL) || (file == NULL))
 700                 return -EINVAL;
 701
 702         pCifsF = file->private_data;
 703
 704         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 705                 return -ENOENT;
 706
 707         if(file->f_dentry == NULL)
 708                 return -ENOENT;
 709
 710         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 711
 712         qstring.name = scratch_buf;
 713         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 714                         pCifsF->srch_inf.info_level,
 715                         pCifsF->srch_inf.unicode,cifs_sb,
 716                         &inum /* returned */);
 717
 718         if(rc)
 719                 return rc;
 720
 721         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 722         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 723                 return -ENOMEM;
 724
 725         if(rc) {
 726                 /* inode created, we need to hash it with right inode number */
 727                 if(inum != 0) {
 728                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 729                         tmp_inode->i_ino = inum;
 730                 }
 731                 insert_inode_hash(tmp_inode);
 732         }
 733
 734         /* we pass in rc below, indicating whether it is a new inode,
 735            so we can figure out whether to invalidate the inode cached
 736            data if the file has changed */
 737         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 738                 unix_fill_in_inode(tmp_inode,
 739                                    (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
 740         } else {
 741                 fill_in_inode(tmp_inode,
 742                               (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
 743         }
 744
 745         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 746                      tmp_inode->i_ino,obj_type);
 747         if(rc) {
 748                 cFYI(1,("filldir rc = %d",rc));
 749         }
 750
 751         dput(tmp_dentry);
 752         return rc;
 753 }
 754
 755 static int cifs_save_resume_key(const char *current_entry,
 756         struct cifsFileInfo *cifsFile)
 757 {
 758         int rc = 0;
 759         unsigned int len = 0;
 760         __u16 level;
 761         char * filename;
 762
 763         if((cifsFile == NULL) || (current_entry == NULL))
 764                 return -EINVAL;
 765
 766         level = cifsFile->srch_inf.info_level;
 767
 768         if(level == SMB_FIND_FILE_UNIX) {
 769                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 770
 771                 filename = &pFindData->FileName[0];
 772                 if(cifsFile->srch_inf.unicode) {
 773                         len = cifs_unicode_bytelen(filename);
 774                 } else {
 775                         /* BB should we make this strnlen of PATH_MAX? */
 776                         len = strnlen(filename, PATH_MAX);
 777                 }
 778                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 779         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 780                 FILE_DIRECTORY_INFO * pFindData =
 781                         (FILE_DIRECTORY_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_FULL_DIRECTORY_INFO) {
 786                 FILE_FULL_DIRECTORY_INFO * pFindData =
 787                         (FILE_FULL_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 if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 792                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 793                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 794                 filename = &pFindData->FileName[0];
 795                 len = le32_to_cpu(pFindData->FileNameLength);
 796                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 797         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 798                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 799                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 800                 filename = &pFindData->FileName[0];
 801                 len = le32_to_cpu(pFindData->FileNameLength);
 802                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 803         } else {
 804                 cFYI(1,("Unknown findfirst level %d",level));
 805                 return -EINVAL;
 806         }
 807         cifsFile->srch_inf.resume_name_len = len;
 808         cifsFile->srch_inf.presume_name = filename;
 809         return rc;
 810 }
 811
 812 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 813 {
 814         int rc = 0;
 815         int xid,i;
 816         struct cifs_sb_info *cifs_sb;
 817         struct cifsTconInfo *pTcon;
 818         struct cifsFileInfo *cifsFile = NULL;
 819         char * current_entry;
 820         int num_to_fill = 0;
 821         char * tmp_buf = NULL;
 822         char * end_of_smb;
 823
 824         xid = GetXid();
 825
 826         if(file->f_dentry == NULL) {
 827                 FreeXid(xid);
 828                 return -EIO;
 829         }
 830
 831         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 832         pTcon = cifs_sb->tcon;
 833         if(pTcon == NULL)
 834                 return -EINVAL;
 835
 836
 837         switch ((int) file->f_pos) {
 838         case 0:
 839                 /*if (filldir(direntry, ".", 1, file->f_pos,
 840                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 841                         cERROR(1, ("Filldir for current dir failed "));
 842                         rc = -ENOMEM;
 843                         break;
 844                 }
 845                 file->f_pos++; */
 846         case 1:
 847                 /* if (filldir(direntry, "..", 2, file->f_pos,
 848                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 849                         cERROR(1, ("Filldir for parent dir failed "));
 850                         rc = -ENOMEM;
 851                         break;
 852                 }
 853                 file->f_pos++; */
 854         case 2:
 855                 /* 1) If search is active,
 856                         is in current search buffer?
 857                         if it before then restart search
 858                         if after then keep searching till find it */
 859
 860                 if(file->private_data == NULL) {
 861                         rc = initiate_cifs_search(xid,file);
 862                         cFYI(1,("initiate cifs search rc %d",rc));
 863                         if(rc) {
 864                                 FreeXid(xid);
 865                                 return rc;
 866                         }
 867                 }
 868         default:
 869                 if(file->private_data == NULL) {
 870                         rc = -EINVAL;
 871                         FreeXid(xid);
 872                         return rc;
 873                 }
 874                 cifsFile = file->private_data;
 875                 if (cifsFile->srch_inf.endOfSearch) {
 876                         if(cifsFile->srch_inf.emptyDir) {
 877                                 cFYI(1, ("End of search, empty dir"));
 878                                 rc = 0;
 879                                 break;
 880                         }
 881                 } /* else {
 882                         cifsFile->invalidHandle = TRUE;
 883                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 884                 }
 885                 kfree(cifsFile->search_resume_name);
 886                 cifsFile->search_resume_name = NULL; */
 887
 888                 /* BB account for . and .. in f_pos as special case */
 889
 890                 rc = find_cifs_entry(xid,pTcon, file,
 891                                 &current_entry,&num_to_fill);
 892                 if(rc) {
 893                         cFYI(1,("fce error %d",rc));
 894                         goto rddir2_exit;
 895                 } else if (current_entry != NULL) {
 896                         cFYI(1,("entry %lld found",file->f_pos));
 897                 } else {
 898                         cFYI(1,("could not find entry"));
 899                         goto rddir2_exit;
 900                 }
 901                 cFYI(1,("loop through %d times filling dir for net buf %p",
 902                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
 903                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 904                         smbCalcSize((struct smb_hdr *)
 905                                     cifsFile->srch_inf.ntwrk_buf_start);
 906                 /* To be safe - for UCS to UTF-8 with strings loaded
 907                 with the rare long characters alloc more to account for
 908                 such multibyte target UTF-8 characters. cifs_unicode.c,
 909                 which actually does the conversion, has the same limit */
 910                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
 911                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
 912                         if(current_entry == NULL) {
 913                                 /* evaluate whether this case is an error */
 914                                 cERROR(1,("past end of SMB num to fill %d i %d",
 915                                           num_to_fill, i));
 916                                 break;
 917                         }
 918
 919                         rc = cifs_filldir(current_entry, file,
 920                                         filldir, direntry,tmp_buf);
 921                         file->f_pos++;
 922                         if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
 923                                 cFYI(1,("last entry in buf at pos %lld %s",
 924                                         file->f_pos,tmp_buf)); /* BB removeme BB */
 925                                 cifs_save_resume_key(current_entry,cifsFile);
 926                                 break;
 927                         } else
 928                                 current_entry = nxt_dir_entry(current_entry,
 929                                                               end_of_smb);
 930                 }
 931                 kfree(tmp_buf);
 932                 break;
 933         } /* end switch */
 934
 935 rddir2_exit:
 936         FreeXid(xid);
 937         return rc;
 938 }