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 &
 400                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 401         if(rc == 0)
 402                 cifsFile->invalidHandle = FALSE;
 403         if((rc == -EOPNOTSUPP) &&
 404                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 405                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 406                 goto ffirst_retry;
 407         }
 408         kfree(full_path);
 409         return rc;
 410 }
 411
 412 /* return length of unicode string in bytes */
 413 static int cifs_unicode_bytelen(char *str)
 414 {
 415         int len;
 416         __le16 * ustr = (__le16 *)str;
 417
 418         for(len=0;len <= PATH_MAX;len++) {
 419                 if(ustr[len] == 0)
 420                         return len << 1;
 421         }
 422         cFYI(1,("Unicode string longer than PATH_MAX found"));
 423         return len << 1;
 424 }
 425
 426 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
 427 {
 428         char * new_entry;
 429         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 430
 431         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 432         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 433         /* validate that new_entry is not past end of SMB */
 434         if(new_entry >= end_of_smb) {
 435                 cERROR(1,
 436                       ("search entry %p began after end of SMB %p old entry %p",
 437                         new_entry, end_of_smb, old_entry));
 438                 return NULL;
 439         } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
 440                 cERROR(1,("search entry %p extends after end of SMB %p",
 441                         new_entry, end_of_smb));
 442                 return NULL;
 443         } else
 444                 return new_entry;
 445
 446 }
 447
 448 #define UNICODE_DOT cpu_to_le16(0x2e)
 449
 450 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 451 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 452 {
 453         int rc = 0;
 454         char * filename = NULL;
 455         int len = 0;
 456
 457         if(cfile->srch_inf.info_level == 0x202) {
 458                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 459                 filename = &pFindData->FileName[0];
 460                 if(cfile->srch_inf.unicode) {
 461                         len = cifs_unicode_bytelen(filename);
 462                 } else {
 463                         /* BB should we make this strnlen of PATH_MAX? */
 464                         len = strnlen(filename, 5);
 465                 }
 466         } else if(cfile->srch_inf.info_level == 0x101) {
 467                 FILE_DIRECTORY_INFO * pFindData =
 468                         (FILE_DIRECTORY_INFO *)current_entry;
 469                 filename = &pFindData->FileName[0];
 470                 len = le32_to_cpu(pFindData->FileNameLength);
 471         } else if(cfile->srch_inf.info_level == 0x102) {
 472                 FILE_FULL_DIRECTORY_INFO * pFindData =
 473                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 474                 filename = &pFindData->FileName[0];
 475                 len = le32_to_cpu(pFindData->FileNameLength);
 476         } else if(cfile->srch_inf.info_level == 0x105) {
 477                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 478                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 479                 filename = &pFindData->FileName[0];
 480                 len = le32_to_cpu(pFindData->FileNameLength);
 481         } else if(cfile->srch_inf.info_level == 0x104) {
 482                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 483                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 484                 filename = &pFindData->FileName[0];
 485                 len = le32_to_cpu(pFindData->FileNameLength);
 486         } else {
 487                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 488         }
 489
 490         if(filename) {
 491                 if(cfile->srch_inf.unicode) {
 492                         __le16 *ufilename = (__le16 *)filename;
 493                         if(len == 2) {
 494                                 /* check for . */
 495                                 if(ufilename[0] == UNICODE_DOT)
 496                                         rc = 1;
 497                         } else if(len == 4) {
 498                                 /* check for .. */
 499                                 if((ufilename[0] == UNICODE_DOT)
 500                                    &&(ufilename[1] == UNICODE_DOT))
 501                                         rc = 2;
 502                         }
 503                 } else /* ASCII */ {
 504                         if(len == 1) {
 505                                 if(filename[0] == '.')
 506                                         rc = 1;
 507                         } else if(len == 2) {
 508                                 if((filename[0] == '.') && (filename[1] == '.'))
 509                                         rc = 2;
 510                         }
 511                 }
 512         }
 513
 514         return rc;
 515 }
 516
 517 /* Check if directory that we are searching has changed so we can decide
 518    whether we can use the cached search results from the previous search */
 519 static int is_dir_changed(struct file * file)
 520 {
 521         struct inode * inode;
 522         struct cifsInodeInfo *cifsInfo;
 523
 524         if(file->f_dentry == NULL)
 525                 return 0;
 526
 527         inode = file->f_dentry->d_inode;
 528
 529         if(inode == NULL)
 530                 return 0;
 531
 532         cifsInfo = CIFS_I(inode);
 533
 534         if(cifsInfo->time == 0)
 535                 return 1; /* directory was changed, perhaps due to unlink */
 536         else
 537                 return 0;
 538
 539 }
 540
 541 /* find the corresponding entry in the search */
 542 /* Note that the SMB server returns search entries for . and .. which
 543    complicates logic here if we choose to parse for them and we do not
 544    assume that they are located in the findfirst return buffer.*/
 545 /* We start counting in the buffer with entry 2 and increment for every
 546    entry (do not increment for . or .. entry) */
 547 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 548         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 549 {
 550         int rc = 0;
 551         int pos_in_buf = 0;
 552         loff_t first_entry_in_buffer;
 553         loff_t index_to_find = file->f_pos;
 554         struct cifsFileInfo * cifsFile = file->private_data;
 555         /* check if index in the buffer */
 556
 557         if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 558            (num_to_ret == NULL))
 559                 return -ENOENT;
 560
 561         *ppCurrentEntry = NULL;
 562         first_entry_in_buffer =
 563                 cifsFile->srch_inf.index_of_last_entry -
 564                         cifsFile->srch_inf.entries_in_buffer;
 565 /*      dump_cifs_file_struct(file, "In fce ");*/
 566         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 567              is_dir_changed(file)) ||
 568            (index_to_find < first_entry_in_buffer)) {
 569                 /* close and restart search */
 570                 cFYI(1,("search backing up - close and restart search"));
 571                 cifsFile->invalidHandle = TRUE;
 572                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 573                 kfree(cifsFile->search_resume_name);
 574                 cifsFile->search_resume_name = NULL;
 575                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 576                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 577                         cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
 578                 }
 579                 rc = initiate_cifs_search(xid,file);
 580                 if(rc) {
 581                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 582                         return rc;
 583                 }
 584         }
 585
 586         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 587               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 588                 cFYI(1,("calling findnext2"));
 589                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 590                                   &cifsFile->srch_inf);
 591                 if(rc)
 592                         return -ENOENT;
 593         }
 594         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 595                 /* we found the buffer that contains the entry */
 596                 /* scan and find it */
 597                 int i;
 598                 char * current_entry;
 599                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 600                         smbCalcSize((struct smb_hdr *)
 601                                 cifsFile->srch_inf.ntwrk_buf_start);
 602                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 603                                         - cifsFile->srch_inf.entries_in_buffer;
 604                 pos_in_buf = index_to_find - first_entry_in_buffer;
 605                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 606                 current_entry = cifsFile->srch_inf.srch_entries_start;
 607                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 608                         /* go entry by entry figuring out which is first */
 609                         /* if( . or ..)
 610                                 skip */
 611                         rc = cifs_entry_is_dot(current_entry,cifsFile);
 612                         if(rc == 1) /* is . or .. so skip */ {
 613                                 cFYI(1,("Entry is .")); /* BB removeme BB */
 614                                 /* continue; */
 615                         } else if (rc == 2 ) {
 616                                 cFYI(1,("Entry is ..")); /* BB removeme BB */
 617                                 /* continue; */
 618                         }
 619                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
 620                 }
 621                 if((current_entry == NULL) && (i < pos_in_buf)) {
 622                         /* BB fixme - check if we should flag this error */
 623                         cERROR(1,("reached end of buf searching for pos in buf"
 624                           " %d index to find %lld rc %d",
 625                           pos_in_buf,index_to_find,rc));
 626                 }
 627                 rc = 0;
 628                 *ppCurrentEntry = current_entry;
 629         } else {
 630                 cFYI(1,("index not in buffer - could not findnext into it"));
 631                 return 0;
 632         }
 633
 634         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 635                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 636                 *num_to_ret = 0;
 637         } else
 638                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 639
 640         return rc;
 641 }
 642
 643 /* inode num, inode type and filename returned */
 644 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 645         char *current_entry, __u16 level, unsigned int unicode,
 646         struct cifs_sb_info * cifs_sb, ino_t *pinum)
 647 {
 648         int rc = 0;
 649         unsigned int len = 0;
 650         char * filename;
 651         struct nls_table * nlt = cifs_sb->local_nls;
 652
 653         *pinum = 0;
 654
 655         if(level == SMB_FIND_FILE_UNIX) {
 656                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 657
 658                 filename = &pFindData->FileName[0];
 659                 if(unicode) {
 660                         len = cifs_unicode_bytelen(filename);
 661                 } else {
 662                         /* BB should we make this strnlen of PATH_MAX? */
 663                         len = strnlen(filename, PATH_MAX);
 664                 }
 665
 666                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 667                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 668                         *pinum = pFindData->UniqueId;
 669         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 670                 FILE_DIRECTORY_INFO * pFindData =
 671                         (FILE_DIRECTORY_INFO *)current_entry;
 672                 filename = &pFindData->FileName[0];
 673                 len = le32_to_cpu(pFindData->FileNameLength);
 674         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 675                 FILE_FULL_DIRECTORY_INFO * pFindData =
 676                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 677                 filename = &pFindData->FileName[0];
 678                 len = le32_to_cpu(pFindData->FileNameLength);
 679         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 680                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 681                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 682                 filename = &pFindData->FileName[0];
 683                 len = le32_to_cpu(pFindData->FileNameLength);
 684                 *pinum = pFindData->UniqueId;
 685         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 686                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 687                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 688                 filename = &pFindData->FileName[0];
 689                 len = le32_to_cpu(pFindData->FileNameLength);
 690         } else {
 691                 cFYI(1,("Unknown findfirst level %d",level));
 692                 return -EINVAL;
 693         }
 694         if(unicode) {
 695                 /* BB fixme - test with long names */
 696                 /* Note converted filename can be longer than in unicode */
 697                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 698                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 699                                         (__le16 *)filename, len/2, nlt);
 700                 else
 701                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 702                                         (wchar_t *)filename,len/2,nlt);
 703         } else {
 704                 pqst->name = filename;
 705                 pqst->len = len;
 706         }
 707         pqst->hash = full_name_hash(pqst->name,pqst->len);
 708 /*      cFYI(1,("filldir on %s",pqst->name));  */
 709         return rc;
 710 }
 711
 712 static int cifs_filldir(char *pfindEntry, struct file *file,
 713         filldir_t filldir, void *direntry, char *scratch_buf)
 714 {
 715         int rc = 0;
 716         struct qstr qstring;
 717         struct cifsFileInfo * pCifsF;
 718         unsigned obj_type;
 719         ino_t  inum;
 720         struct cifs_sb_info * cifs_sb;
 721         struct inode *tmp_inode;
 722         struct dentry *tmp_dentry;
 723
 724         /* get filename and len into qstring */
 725         /* get dentry */
 726         /* decide whether to create and populate ionde */
 727         if((direntry == NULL) || (file == NULL))
 728                 return -EINVAL;
 729
 730         pCifsF = file->private_data;
 731
 732         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 733                 return -ENOENT;
 734
 735         if(file->f_dentry == NULL)
 736                 return -ENOENT;
 737
 738         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 739
 740         qstring.name = scratch_buf;
 741         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 742                         pCifsF->srch_inf.info_level,
 743                         pCifsF->srch_inf.unicode,cifs_sb,
 744                         &inum /* returned */);
 745
 746         if(rc)
 747                 return rc;
 748
 749         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 750         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 751                 return -ENOMEM;
 752
 753         if(rc) {
 754                 /* inode created, we need to hash it with right inode number */
 755                 if(inum != 0) {
 756                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 757                         tmp_inode->i_ino = inum;
 758                 }
 759                 insert_inode_hash(tmp_inode);
 760         }
 761
 762         /* we pass in rc below, indicating whether it is a new inode,
 763            so we can figure out whether to invalidate the inode cached
 764            data if the file has changed */
 765         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 766                 unix_fill_in_inode(tmp_inode,
 767                                    (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
 768         } else {
 769                 fill_in_inode(tmp_inode,
 770                               (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
 771         }
 772
 773         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 774                      tmp_inode->i_ino,obj_type);
 775         if(rc) {
 776                 cFYI(1,("filldir rc = %d",rc));
 777         }
 778
 779         dput(tmp_dentry);
 780         return rc;
 781 }
 782
 783 static int cifs_save_resume_key(const char *current_entry,
 784         struct cifsFileInfo *cifsFile)
 785 {
 786         int rc = 0;
 787         unsigned int len = 0;
 788         __u16 level;
 789         char * filename;
 790
 791         if((cifsFile == NULL) || (current_entry == NULL))
 792                 return -EINVAL;
 793
 794         level = cifsFile->srch_inf.info_level;
 795
 796         if(level == SMB_FIND_FILE_UNIX) {
 797                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 798
 799                 filename = &pFindData->FileName[0];
 800                 if(cifsFile->srch_inf.unicode) {
 801                         len = cifs_unicode_bytelen(filename);
 802                 } else {
 803                         /* BB should we make this strnlen of PATH_MAX? */
 804                         len = strnlen(filename, PATH_MAX);
 805                 }
 806                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 807         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 808                 FILE_DIRECTORY_INFO * pFindData =
 809                         (FILE_DIRECTORY_INFO *)current_entry;
 810                 filename = &pFindData->FileName[0];
 811                 len = le32_to_cpu(pFindData->FileNameLength);
 812                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 813         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 814                 FILE_FULL_DIRECTORY_INFO * pFindData =
 815                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 816                 filename = &pFindData->FileName[0];
 817                 len = le32_to_cpu(pFindData->FileNameLength);
 818                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 819         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 820                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 821                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 822                 filename = &pFindData->FileName[0];
 823                 len = le32_to_cpu(pFindData->FileNameLength);
 824                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 825         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 826                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 827                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 828                 filename = &pFindData->FileName[0];
 829                 len = le32_to_cpu(pFindData->FileNameLength);
 830                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 831         } else {
 832                 cFYI(1,("Unknown findfirst level %d",level));
 833                 return -EINVAL;
 834         }
 835         cifsFile->srch_inf.resume_name_len = len;
 836         cifsFile->srch_inf.presume_name = filename;
 837         return rc;
 838 }
 839
 840 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 841 {
 842         int rc = 0;
 843         int xid,i;
 844         struct cifs_sb_info *cifs_sb;
 845         struct cifsTconInfo *pTcon;
 846         struct cifsFileInfo *cifsFile = NULL;
 847         char * current_entry;
 848         int num_to_fill = 0;
 849         char * tmp_buf = NULL;
 850         char * end_of_smb;
 851
 852         xid = GetXid();
 853
 854         if(file->f_dentry == NULL) {
 855                 FreeXid(xid);
 856                 return -EIO;
 857         }
 858
 859         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 860         pTcon = cifs_sb->tcon;
 861         if(pTcon == NULL)
 862                 return -EINVAL;
 863
 864         switch ((int) file->f_pos) {
 865         case 0:
 866                 /*if (filldir(direntry, ".", 1, file->f_pos,
 867                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 868                         cERROR(1, ("Filldir for current dir failed "));
 869                         rc = -ENOMEM;
 870                         break;
 871                 }
 872                 file->f_pos++; */
 873         case 1:
 874                 /* if (filldir(direntry, "..", 2, file->f_pos,
 875                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 876                         cERROR(1, ("Filldir for parent dir failed "));
 877                         rc = -ENOMEM;
 878                         break;
 879                 }
 880                 file->f_pos++; */
 881         case 2:
 882                 /* 1) If search is active,
 883                         is in current search buffer?
 884                         if it before then restart search
 885                         if after then keep searching till find it */
 886
 887                 if(file->private_data == NULL) {
 888                         rc = initiate_cifs_search(xid,file);
 889                         cFYI(1,("initiate cifs search rc %d",rc));
 890                         if(rc) {
 891                                 FreeXid(xid);
 892                                 return rc;
 893                         }
 894                 }
 895         default:
 896                 if(file->private_data == NULL) {
 897                         rc = -EINVAL;
 898                         FreeXid(xid);
 899                         return rc;
 900                 }
 901                 cifsFile = file->private_data;
 902                 if (cifsFile->srch_inf.endOfSearch) {
 903                         if(cifsFile->srch_inf.emptyDir) {
 904                                 cFYI(1, ("End of search, empty dir"));
 905                                 rc = 0;
 906                                 break;
 907                         }
 908                 } /* else {
 909                         cifsFile->invalidHandle = TRUE;
 910                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 911                 }
 912                 kfree(cifsFile->search_resume_name);
 913                 cifsFile->search_resume_name = NULL; */
 914
 915                 /* BB account for . and .. in f_pos as special case */
 916
 917                 rc = find_cifs_entry(xid,pTcon, file,
 918                                 &current_entry,&num_to_fill);
 919                 if(rc) {
 920                         cFYI(1,("fce error %d",rc));
 921                         goto rddir2_exit;
 922                 } else if (current_entry != NULL) {
 923                         cFYI(1,("entry %lld found",file->f_pos));
 924                 } else {
 925                         cFYI(1,("could not find entry"));
 926                         goto rddir2_exit;
 927                 }
 928                 cFYI(1,("loop through %d times filling dir for net buf %p",
 929                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
 930                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 931                         smbCalcSize((struct smb_hdr *)
 932                                     cifsFile->srch_inf.ntwrk_buf_start);
 933                 /* To be safe - for UCS to UTF-8 with strings loaded
 934                 with the rare long characters alloc more to account for
 935                 such multibyte target UTF-8 characters. cifs_unicode.c,
 936                 which actually does the conversion, has the same limit */
 937                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
 938                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
 939                         if(current_entry == NULL) {
 940                                 /* evaluate whether this case is an error */
 941                                 cERROR(1,("past end of SMB num to fill %d i %d",
 942                                           num_to_fill, i));
 943                                 break;
 944                         }
 945
 946                         rc = cifs_filldir(current_entry, file,
 947                                         filldir, direntry,tmp_buf);
 948                         file->f_pos++;
 949                         if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
 950                                 cFYI(1,("last entry in buf at pos %lld %s",
 951                                         file->f_pos,tmp_buf)); /* BB removeme BB */
 952                                 cifs_save_resume_key(current_entry,cifsFile);
 953                                 break;
 954                         } else
 955                                 current_entry = nxt_dir_entry(current_entry,
 956                                                               end_of_smb);
 957                 }
 958                 kfree(tmp_buf);
 959                 break;
 960         } /* end switch */
 961
 962 rddir2_exit:
 963         FreeXid(xid);
 964         return rc;
 965 }