fs/cifs/readdir.c

   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004, 2005
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <linux/fs.h>
  24 #include <linux/stat.h>
  25 #include <linux/smp_lock.h>
  26 #include "cifspdu.h"
  27 #include "cifsglob.h"
  28 #include "cifsproto.h"
  29 #include "cifs_unicode.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_fs_sb.h"
  32 #include "cifsfs.h"
  33
  34 /* BB fixme - add debug wrappers around this function to disable it fixme BB */
  35 /* static void dump_cifs_file_struct(struct file *file, char *label)
  36 {
  37         struct cifsFileInfo * cf;
  38
  39         if(file) {
  40                 cf = file->private_data;
  41                 if(cf == NULL) {
  42                         cFYI(1,("empty cifs private file data"));
  43                         return;
  44                 }
  45                 if(cf->invalidHandle) {
  46                         cFYI(1,("invalid handle"));
  47                 }
  48                 if(cf->srch_inf.endOfSearch) {
  49                         cFYI(1,("end of search"));
  50                 }
  51                 if(cf->srch_inf.emptyDir) {
  52                         cFYI(1,("empty dir"));
  53                 }
  54
  55         }
  56 } */
  57
  58 /* Returns one if new inode created (which therefore needs to be hashed) */
  59 /* Might check in the future if inode number changed so we can rehash inode */
  60 static int construct_dentry(struct qstr *qstring, struct file *file,
  61         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  62 {
  63         struct dentry *tmp_dentry;
  64         struct cifs_sb_info *cifs_sb;
  65         struct cifsTconInfo *pTcon;
  66         int rc = 0;
  67
  68         cFYI(1, ("For %s", qstring->name));
  69         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
  70         pTcon = cifs_sb->tcon;
  71
  72         qstring->hash = full_name_hash(qstring->name, qstring->len);
  73         tmp_dentry = d_lookup(file->f_dentry, qstring);
  74         if (tmp_dentry) {
  75                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
  76                 *ptmp_inode = tmp_dentry->d_inode;
  77 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
  78                 if(*ptmp_inode == NULL) {
  79                         *ptmp_inode = new_inode(file->f_dentry->d_sb);
  80                         if(*ptmp_inode == NULL)
  81                                 return rc;
  82                         rc = 1;
  83                         d_instantiate(tmp_dentry, *ptmp_inode);
  84                 }
  85         } else {
  86                 tmp_dentry = d_alloc(file->f_dentry, qstring);
  87                 if(tmp_dentry == NULL) {
  88                         cERROR(1,("Failed allocating dentry"));
  89                         *ptmp_inode = NULL;
  90                         return rc;
  91                 }
  92
  93                 *ptmp_inode = new_inode(file->f_dentry->d_sb);
  94                 tmp_dentry->d_op = &cifs_dentry_ops;
  95                 if(*ptmp_inode == NULL)
  96                         return rc;
  97                 rc = 1;
  98                 d_instantiate(tmp_dentry, *ptmp_inode);
  99                 d_rehash(tmp_dentry);
 100         }
 101
 102         tmp_dentry->d_time = jiffies;
 103         *pnew_dentry = tmp_dentry;
 104         return rc;
 105 }
 106
 107 static void fill_in_inode(struct inode *tmp_inode,
 108         FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
 109 {
 110         loff_t local_size;
 111         struct timespec local_mtime;
 112
 113         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 114         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 115         __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 116         __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 117         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 118
 119         cifsInfo->cifsAttrs = attr;
 120         cifsInfo->time = jiffies;
 121
 122         /* save mtime and size */
 123         local_mtime = tmp_inode->i_mtime;
 124         local_size  = tmp_inode->i_size;
 125
 126         /* Linux can not store file creation time unfortunately so ignore it */
 127         tmp_inode->i_atime =
 128             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 129         tmp_inode->i_mtime =
 130             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 131         tmp_inode->i_ctime =
 132             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 133         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 134         /* 2767 perms - indicate mandatory locking */
 135                 /* BB fill in uid and gid here? with help from winbind?
 136                    or retrieve from NTFS stream extended attribute */
 137         if (atomic_read(&cifsInfo->inUse) == 0) {
 138                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 139                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 140                 /* set default mode. will override for dirs below */
 141                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 142         }
 143
 144         if (attr & ATTR_DIRECTORY) {
 145                 *pobject_type = DT_DIR;
 146                 /* override default perms since we do not lock dirs */
 147                 if(atomic_read(&cifsInfo->inUse) == 0) {
 148                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 149                 }
 150                 tmp_inode->i_mode |= S_IFDIR;
 151 /* we no longer mark these because we could not follow them */
 152 /*        } else if (attr & ATTR_REPARSE) {
 153                 *pobject_type = DT_LNK;
 154                 tmp_inode->i_mode |= S_IFLNK; */
 155         } else {
 156                 *pobject_type = DT_REG;
 157                 tmp_inode->i_mode |= S_IFREG;
 158                 if (attr & ATTR_READONLY)
 159                         tmp_inode->i_mode &= ~(S_IWUGO);
 160         } /* could add code here - to validate if device or weird share type? */
 161
 162         /* can not fill in nlink here as in qpathinfo version and Unx search */
 163         if (atomic_read(&cifsInfo->inUse) == 0) {
 164                 atomic_set(&cifsInfo->inUse, 1);
 165         }
 166
 167         if (is_size_safe_to_change(cifsInfo)) {
 168                 /* can not safely change the file size here if the
 169                 client is writing to it due to potential races */
 170                 i_size_write(tmp_inode, end_of_file);
 171
 172         /* 512 bytes (2**9) is the fake blocksize that must be used */
 173         /* for this calculation, even though the reported blocksize is larger */
 174                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 175         }
 176
 177         if (allocation_size < end_of_file)
 178                 cFYI(1, ("May be sparse file, allocation less than file size"));
 179         cFYI(1,
 180              ("File Size %ld and blocks %ld and blocksize %ld",
 181               (unsigned long)tmp_inode->i_size, tmp_inode->i_blocks,
 182               tmp_inode->i_blksize));
 183         if (S_ISREG(tmp_inode->i_mode)) {
 184                 cFYI(1, ("File inode"));
 185                 tmp_inode->i_op = &cifs_file_inode_ops;
 186                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 187                         tmp_inode->i_fop = &cifs_file_direct_ops;
 188                 else
 189                         tmp_inode->i_fop = &cifs_file_ops;
 190                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 191
 192                 if(isNewInode)
 193                         return; /* No sense invalidating pages for new inode since we
 194                                            have not started caching readahead file data yet */
 195
 196                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 197                         (local_size == tmp_inode->i_size)) {
 198                         cFYI(1, ("inode exists but unchanged"));
 199                 } else {
 200                         /* file may have changed on server */
 201                         cFYI(1, ("invalidate inode, readdir detected change"));
 202                         invalidate_remote_inode(tmp_inode);
 203                 }
 204         } else if (S_ISDIR(tmp_inode->i_mode)) {
 205                 cFYI(1, ("Directory inode"));
 206                 tmp_inode->i_op = &cifs_dir_inode_ops;
 207                 tmp_inode->i_fop = &cifs_dir_ops;
 208         } else if (S_ISLNK(tmp_inode->i_mode)) {
 209                 cFYI(1, ("Symbolic Link inode"));
 210                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 211         } else {
 212                 cFYI(1, ("Init special inode"));
 213                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 214                                    tmp_inode->i_rdev);
 215         }
 216 }
 217
 218 static void unix_fill_in_inode(struct inode *tmp_inode,
 219         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 220 {
 221         loff_t local_size;
 222         struct timespec local_mtime;
 223
 224         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 225         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 226
 227         __u32 type = le32_to_cpu(pfindData->Type);
 228         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 229         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 230         cifsInfo->time = jiffies;
 231         atomic_inc(&cifsInfo->inUse);
 232
 233         /* save mtime and size */
 234         local_mtime = tmp_inode->i_mtime;
 235         local_size  = tmp_inode->i_size;
 236
 237         tmp_inode->i_atime =
 238             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 239         tmp_inode->i_mtime =
 240             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 241         tmp_inode->i_ctime =
 242             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 243
 244         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 245         if (type == UNIX_FILE) {
 246                 *pobject_type = DT_REG;
 247                 tmp_inode->i_mode |= S_IFREG;
 248         } else if (type == UNIX_SYMLINK) {
 249                 *pobject_type = DT_LNK;
 250                 tmp_inode->i_mode |= S_IFLNK;
 251         } else if (type == UNIX_DIR) {
 252                 *pobject_type = DT_DIR;
 253                 tmp_inode->i_mode |= S_IFDIR;
 254         } else if (type == UNIX_CHARDEV) {
 255                 *pobject_type = DT_CHR;
 256                 tmp_inode->i_mode |= S_IFCHR;
 257                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 258                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 259         } else if (type == UNIX_BLOCKDEV) {
 260                 *pobject_type = DT_BLK;
 261                 tmp_inode->i_mode |= S_IFBLK;
 262                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 263                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 264         } else if (type == UNIX_FIFO) {
 265                 *pobject_type = DT_FIFO;
 266                 tmp_inode->i_mode |= S_IFIFO;
 267         } else if (type == UNIX_SOCKET) {
 268                 *pobject_type = DT_SOCK;
 269                 tmp_inode->i_mode |= S_IFSOCK;
 270         }
 271
 272         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 273         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 274         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 275
 276         if (is_size_safe_to_change(cifsInfo)) {
 277                 /* can not safely change the file size here if the
 278                 client is writing to it due to potential races */
 279                 i_size_write(tmp_inode,end_of_file);
 280
 281         /* 512 bytes (2**9) is the fake blocksize that must be used */
 282         /* for this calculation, not the real blocksize */
 283                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 284         }
 285
 286         if (S_ISREG(tmp_inode->i_mode)) {
 287                 cFYI(1, ("File inode"));
 288                 tmp_inode->i_op = &cifs_file_inode_ops;
 289                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 290                         tmp_inode->i_fop = &cifs_file_direct_ops;
 291                 else
 292                         tmp_inode->i_fop = &cifs_file_ops;
 293                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 294
 295                 if(isNewInode)
 296                         return; /* No sense invalidating pages for new inode since we
 297                                            have not started caching readahead file data yet */
 298
 299                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 300                         (local_size == tmp_inode->i_size)) {
 301                         cFYI(1, ("inode exists but unchanged"));
 302                 } else {
 303                         /* file may have changed on server */
 304                         cFYI(1, ("invalidate inode, readdir detected change"));
 305                         invalidate_remote_inode(tmp_inode);
 306                 }
 307         } else if (S_ISDIR(tmp_inode->i_mode)) {
 308                 cFYI(1, ("Directory inode"));
 309                 tmp_inode->i_op = &cifs_dir_inode_ops;
 310                 tmp_inode->i_fop = &cifs_dir_ops;
 311         } else if (S_ISLNK(tmp_inode->i_mode)) {
 312                 cFYI(1, ("Symbolic Link inode"));
 313                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 314 /* tmp_inode->i_fop = *//* do not need to set to anything */
 315         } else {
 316                 cFYI(1, ("Special inode"));
 317                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 318                                    tmp_inode->i_rdev);
 319         }
 320 }
 321
 322 static int initiate_cifs_search(const int xid, struct file *file)
 323 {
 324         int rc = 0;
 325         char * full_path;
 326         struct cifsFileInfo * cifsFile;
 327         struct cifs_sb_info *cifs_sb;
 328         struct cifsTconInfo *pTcon;
 329
 330         if(file->private_data == NULL) {
 331                 file->private_data =
 332                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 333         }
 334
 335         if(file->private_data == NULL) {
 336                 return -ENOMEM;
 337         } else {
 338                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 339         }
 340         cifsFile = file->private_data;
 341         cifsFile->invalidHandle = TRUE;
 342         cifsFile->srch_inf.endOfSearch = FALSE;
 343
 344         if(file->f_dentry == NULL)
 345                 return -ENOENT;
 346
 347         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 348         if(cifs_sb == NULL)
 349                 return -EINVAL;
 350
 351         pTcon = cifs_sb->tcon;
 352         if(pTcon == NULL)
 353                 return -EINVAL;
 354
 355         down(&file->f_dentry->d_sb->s_vfs_rename_sem);
 356         full_path = build_path_from_dentry(file->f_dentry);
 357         up(&file->f_dentry->d_sb->s_vfs_rename_sem);
 358
 359         if(full_path == NULL) {
 360                 return -ENOMEM;
 361         }
 362
 363         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 364
 365 ffirst_retry:
 366         /* test for Unix extensions */
 367         if (pTcon->ses->capabilities & CAP_UNIX) {
 368                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 369         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 370                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 371         } else /* not srvinos - BB fixme add check for backlevel? */ {
 372                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 373         }
 374
 375         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 376                 &cifsFile->netfid, &cifsFile->srch_inf,
 377                 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 378         if(rc == 0)
 379                 cifsFile->invalidHandle = FALSE;
 380         if((rc == -EOPNOTSUPP) &&
 381                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 382                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 383                 goto ffirst_retry;
 384         }
 385         kfree(full_path);
 386         return rc;
 387 }
 388
 389 /* return length of unicode string in bytes */
 390 static int cifs_unicode_bytelen(char *str)
 391 {
 392         int len;
 393         __le16 * ustr = (__le16 *)str;
 394
 395         for(len=0;len <= PATH_MAX;len++) {
 396                 if(ustr[len] == 0)
 397                         return len << 1;
 398         }
 399         cFYI(1,("Unicode string longer than PATH_MAX found"));
 400         return len << 1;
 401 }
 402
 403 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
 404 {
 405         char * new_entry;
 406         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 407
 408         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 409         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 410         /* validate that new_entry is not past end of SMB */
 411         if(new_entry >= end_of_smb) {
 412                 cERROR(1,
 413                       ("search entry %p began after end of SMB %p old entry %p",
 414                         new_entry, end_of_smb, old_entry));
 415                 return NULL;
 416         } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
 417                 cERROR(1,("search entry %p extends after end of SMB %p",
 418                         new_entry, end_of_smb));
 419                 return NULL;
 420         } else
 421                 return new_entry;
 422
 423 }
 424
 425 #define UNICODE_DOT cpu_to_le16(0x2e)
 426
 427 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 428 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 429 {
 430         int rc = 0;
 431         char * filename = NULL;
 432         int len = 0;
 433
 434         if(cfile->srch_inf.info_level == 0x202) {
 435                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 436                 filename = &pFindData->FileName[0];
 437                 if(cfile->srch_inf.unicode) {
 438                         len = cifs_unicode_bytelen(filename);
 439                 } else {
 440                         /* BB should we make this strnlen of PATH_MAX? */
 441                         len = strnlen(filename, 5);
 442                 }
 443         } else if(cfile->srch_inf.info_level == 0x101) {
 444                 FILE_DIRECTORY_INFO * pFindData =
 445                         (FILE_DIRECTORY_INFO *)current_entry;
 446                 filename = &pFindData->FileName[0];
 447                 len = le32_to_cpu(pFindData->FileNameLength);
 448         } else if(cfile->srch_inf.info_level == 0x102) {
 449                 FILE_FULL_DIRECTORY_INFO * pFindData =
 450                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 451                 filename = &pFindData->FileName[0];
 452                 len = le32_to_cpu(pFindData->FileNameLength);
 453         } else if(cfile->srch_inf.info_level == 0x105) {
 454                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 455                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 456                 filename = &pFindData->FileName[0];
 457                 len = le32_to_cpu(pFindData->FileNameLength);
 458         } else if(cfile->srch_inf.info_level == 0x104) {
 459                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 460                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 461                 filename = &pFindData->FileName[0];
 462                 len = le32_to_cpu(pFindData->FileNameLength);
 463         } else {
 464                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 465         }
 466
 467         if(filename) {
 468                 if(cfile->srch_inf.unicode) {
 469                         __le16 *ufilename = (__le16 *)filename;
 470                         if(len == 2) {
 471                                 /* check for . */
 472                                 if(ufilename[0] == UNICODE_DOT)
 473                                         rc = 1;
 474                         } else if(len == 4) {
 475                                 /* check for .. */
 476                                 if((ufilename[0] == UNICODE_DOT)
 477                                    &&(ufilename[1] == UNICODE_DOT))
 478                                         rc = 2;
 479                         }
 480                 } else /* ASCII */ {
 481                         if(len == 1) {
 482                                 if(filename[0] == '.')
 483                                         rc = 1;
 484                         } else if(len == 2) {
 485                                 if((filename[0] == '.') && (filename[1] == '.'))
 486                                         rc = 2;
 487                         }
 488                 }
 489         }
 490
 491         return rc;
 492 }
 493
 494 /* find the corresponding entry in the search */
 495 /* Note that the SMB server returns search entries for . and .. which
 496    complicates logic here if we choose to parse for them and we do not
 497    assume that they are located in the findfirst return buffer.*/
 498 /* We start counting in the buffer with entry 2 and increment for every
 499    entry (do not increment for . or .. entry) */
 500 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 501         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 502 {
 503         int rc = 0;
 504         int pos_in_buf = 0;
 505         loff_t first_entry_in_buffer;
 506         loff_t index_to_find = file->f_pos;
 507         struct cifsFileInfo * cifsFile = file->private_data;
 508         /* check if index in the buffer */
 509
 510         if((cifsFile == NULL) || (ppCurrentEntry == NULL) || (num_to_ret == NULL))
 511                 return -ENOENT;
 512
 513         *ppCurrentEntry = NULL;
 514         first_entry_in_buffer =
 515                 cifsFile->srch_inf.index_of_last_entry -
 516                         cifsFile->srch_inf.entries_in_buffer;
 517 /*      dump_cifs_file_struct(file, "In fce ");*/
 518         if(index_to_find < first_entry_in_buffer) {
 519                 /* close and restart search */
 520                 cFYI(1,("search backing up - close and restart search"));
 521                 cifsFile->invalidHandle = TRUE;
 522                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 523                 kfree(cifsFile->search_resume_name);
 524                 cifsFile->search_resume_name = NULL;
 525                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 526                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 527                         cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
 528                 }
 529                 rc = initiate_cifs_search(xid,file);
 530                 if(rc) {
 531                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 532                         return rc;
 533                 }
 534         }
 535
 536         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 537               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 538                 cFYI(1,("calling findnext2"));
 539                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid, &cifsFile->srch_inf);
 540                 if(rc)
 541                         return -ENOENT;
 542         }
 543         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 544                 /* we found the buffer that contains the entry */
 545                 /* scan and find it */
 546                 int i;
 547                 char * current_entry;
 548                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 549                         smbCalcSize((struct smb_hdr *)
 550                                 cifsFile->srch_inf.ntwrk_buf_start);
 551 /*      dump_cifs_file_struct(file,"found entry in fce "); */
 552                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 553                                         - cifsFile->srch_inf.entries_in_buffer;
 554                 pos_in_buf = index_to_find - first_entry_in_buffer;
 555                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 556                 current_entry = cifsFile->srch_inf.srch_entries_start;
 557                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 558                         /* go entry to next entry figuring out which we need to start with */
 559                         /* if( . or ..)
 560                                 skip */
 561                         rc = cifs_entry_is_dot(current_entry,cifsFile);
 562                         if(rc == 1) /* is . or .. so skip */ {
 563                                 cFYI(1,("Entry is .")); /* BB removeme BB */
 564                                 /* continue; */
 565                         } else if (rc == 2 ) {
 566                                 cFYI(1,("Entry is ..")); /* BB removeme BB */
 567                                 /* continue; */
 568                         }
 569                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
 570                 }
 571                 if((current_entry == NULL) && (i < pos_in_buf)) {
 572                         /* BB fixme - check if we should flag this error */
 573                         cERROR(1,("reached end of buf searching for pos in buf"
 574                           " %d index to find %lld rc %d",
 575                           pos_in_buf,index_to_find,rc));
 576                 }
 577                 rc = 0;
 578                 *ppCurrentEntry = current_entry;
 579         } else {
 580                 cFYI(1,("index not in buffer - could not findnext into it"));
 581                 return 0;
 582         }
 583
 584         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 585                 cFYI(1,("can not return entries when pos_in_buf beyond last entry"));
 586                 *num_to_ret = 0;
 587         } else
 588                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 589 /*      dump_cifs_file_struct(file, "end fce ");*/
 590
 591         return rc;
 592 }
 593
 594 /* inode num, inode type and filename returned */
 595 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 596         char *current_entry, __u16 level, unsigned int unicode,
 597         struct cifs_sb_info * cifs_sb, ino_t *pinum)
 598 {
 599         int rc = 0;
 600         unsigned int len = 0;
 601         char * filename;
 602         struct nls_table * nlt = cifs_sb->local_nls;
 603
 604         *pinum = 0;
 605
 606         if(level == SMB_FIND_FILE_UNIX) {
 607                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 608
 609                 filename = &pFindData->FileName[0];
 610                 if(unicode) {
 611                         len = cifs_unicode_bytelen(filename);
 612                 } else {
 613                         /* BB should we make this strnlen of PATH_MAX? */
 614                         len = strnlen(filename, PATH_MAX);
 615                 }
 616
 617                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 618                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 619                         *pinum = pFindData->UniqueId;
 620         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 621                 FILE_DIRECTORY_INFO * pFindData =
 622                         (FILE_DIRECTORY_INFO *)current_entry;
 623                 filename = &pFindData->FileName[0];
 624                 len = le32_to_cpu(pFindData->FileNameLength);
 625         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 626                 FILE_FULL_DIRECTORY_INFO * pFindData =
 627                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 628                 filename = &pFindData->FileName[0];
 629                 len = le32_to_cpu(pFindData->FileNameLength);
 630         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 631                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 632                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 633                 filename = &pFindData->FileName[0];
 634                 len = le32_to_cpu(pFindData->FileNameLength);
 635                 *pinum = pFindData->UniqueId;
 636         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 637                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 638                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 639                 filename = &pFindData->FileName[0];
 640                 len = le32_to_cpu(pFindData->FileNameLength);
 641         } else {
 642                 cFYI(1,("Unknown findfirst level %d",level));
 643                 return -EINVAL;
 644         }
 645         if(unicode) {
 646                 /* BB fixme - test with long names */
 647                 /* Note converted filename can be longer than in unicode */
 648                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 649                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 650                                         (__le16 *)filename, len/2, nlt);
 651                 else
 652                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 653                                         (wchar_t *)filename,len/2,nlt);
 654         } else {
 655                 pqst->name = filename;
 656                 pqst->len = len;
 657         }
 658         pqst->hash = full_name_hash(pqst->name,pqst->len);
 659 /*      cFYI(1,("filldir on %s",pqst->name));  */
 660         return rc;
 661 }
 662
 663 static int cifs_filldir(char *pfindEntry, struct file *file,
 664         filldir_t filldir, void *direntry, char *scratch_buf)
 665 {
 666         int rc = 0;
 667         struct qstr qstring;
 668         struct cifsFileInfo * pCifsF;
 669         unsigned obj_type;
 670         ino_t  inum;
 671         struct cifs_sb_info * cifs_sb;
 672         struct inode *tmp_inode;
 673         struct dentry *tmp_dentry;
 674
 675         /* get filename and len into qstring */
 676         /* get dentry */
 677         /* decide whether to create and populate ionde */
 678         if((direntry == NULL) || (file == NULL))
 679                 return -EINVAL;
 680
 681         pCifsF = file->private_data;
 682
 683         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 684                 return -ENOENT;
 685
 686         if(file->f_dentry == NULL)
 687                 return -ENOENT;
 688
 689         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 690
 691         qstring.name = scratch_buf;
 692         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 693                         pCifsF->srch_inf.info_level,
 694                         pCifsF->srch_inf.unicode,cifs_sb,
 695                         &inum /* returned */);
 696
 697         if(rc)
 698                 return rc;
 699
 700         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 701         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 702                 return -ENOMEM;
 703
 704         if(rc) {
 705                 /* inode created, we need to hash it with right inode number */
 706                 if(inum != 0) {
 707                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 708                         tmp_inode->i_ino = inum;
 709                 }
 710                 insert_inode_hash(tmp_inode);
 711         }
 712
 713         /* we pass in rc below, indicating whether it is a new inode,
 714            so we can figure out whether to invalidate the inode cached
 715            data if the file has changed */
 716         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 717                 unix_fill_in_inode(tmp_inode,
 718                                    (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
 719         } else {
 720                 fill_in_inode(tmp_inode,
 721                               (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
 722         }
 723
 724         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,tmp_inode->i_ino,obj_type);
 725         if(rc) {
 726                 cFYI(1,("filldir rc = %d",rc));
 727         }
 728
 729         dput(tmp_dentry);
 730         return rc;
 731 }
 732
 733 static int cifs_save_resume_key(const char *current_entry,
 734         struct cifsFileInfo *cifsFile)
 735 {
 736         int rc = 0;
 737         unsigned int len = 0;
 738         __u16 level;
 739         char * filename;
 740
 741         if((cifsFile == NULL) || (current_entry == NULL))
 742                 return -EINVAL;
 743
 744         level = cifsFile->srch_inf.info_level;
 745
 746         if(level == SMB_FIND_FILE_UNIX) {
 747                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 748
 749                 filename = &pFindData->FileName[0];
 750                 if(cifsFile->srch_inf.unicode) {
 751                         len = cifs_unicode_bytelen(filename);
 752                 } else {
 753                         /* BB should we make this strnlen of PATH_MAX? */
 754                         len = strnlen(filename, PATH_MAX);
 755                 }
 756                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 757         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 758                 FILE_DIRECTORY_INFO * pFindData =
 759                         (FILE_DIRECTORY_INFO *)current_entry;
 760                 filename = &pFindData->FileName[0];
 761                 len = le32_to_cpu(pFindData->FileNameLength);
 762                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 763         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 764                 FILE_FULL_DIRECTORY_INFO * pFindData =
 765                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 766                 filename = &pFindData->FileName[0];
 767                 len = le32_to_cpu(pFindData->FileNameLength);
 768                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 769         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 770                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 771                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 772                 filename = &pFindData->FileName[0];
 773                 len = le32_to_cpu(pFindData->FileNameLength);
 774                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 775         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 776                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 777                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 778                 filename = &pFindData->FileName[0];
 779                 len = le32_to_cpu(pFindData->FileNameLength);
 780                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 781         } else {
 782                 cFYI(1,("Unknown findfirst level %d",level));
 783                 return -EINVAL;
 784         }
 785         cifsFile->srch_inf.resume_name_len = len;
 786         cifsFile->srch_inf.presume_name = filename;
 787         return rc;
 788 }
 789
 790 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 791 {
 792         int rc = 0;
 793         int xid,i;
 794         struct cifs_sb_info *cifs_sb;
 795         struct cifsTconInfo *pTcon;
 796         struct cifsFileInfo *cifsFile = NULL;
 797         char * current_entry;
 798         int num_to_fill = 0;
 799         char * tmp_buf = NULL;
 800         char * end_of_smb;
 801
 802         xid = GetXid();
 803
 804         if(file->f_dentry == NULL) {
 805                 FreeXid(xid);
 806                 return -EIO;
 807         }
 808 /*      dump_cifs_file_struct(file, "Begin rdir "); */
 809
 810         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 811         pTcon = cifs_sb->tcon;
 812         if(pTcon == NULL)
 813                 return -EINVAL;
 814
 815 /*      cFYI(1,("readdir2 pos: %lld",file->f_pos)); */
 816
 817         switch ((int) file->f_pos) {
 818         case 0:
 819                 /*if (filldir(direntry, ".", 1, file->f_pos,
 820                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 821                         cERROR(1, ("Filldir for current dir failed "));
 822                         rc = -ENOMEM;
 823                         break;
 824                 }
 825                 file->f_pos++; */
 826         case 1:
 827                 /* if (filldir(direntry, "..", 2, file->f_pos,
 828                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 829                         cERROR(1, ("Filldir for parent dir failed "));
 830                         rc = -ENOMEM;
 831                         break;
 832                 }
 833                 file->f_pos++; */
 834         case 2:
 835                 /* 1) If search is active,
 836                         is in current search buffer?
 837                         if it before then restart search
 838                         if after then keep searching till find it */
 839
 840                 if(file->private_data == NULL) {
 841                         rc = initiate_cifs_search(xid,file);
 842                         cFYI(1,("initiate cifs search rc %d",rc));
 843                         if(rc) {
 844                                 FreeXid(xid);
 845                                 return rc;
 846                         }
 847                 }
 848         default:
 849                 if(file->private_data == NULL) {
 850                         rc = -EINVAL;
 851                         FreeXid(xid);
 852                         return rc;
 853                 }
 854                 cifsFile = file->private_data;
 855                 if (cifsFile->srch_inf.endOfSearch) {
 856                         if(cifsFile->srch_inf.emptyDir) {
 857                                 cFYI(1, ("End of search, empty dir"));
 858                                 rc = 0;
 859                                 break;
 860                         }
 861                 } /* else {
 862                         cifsFile->invalidHandle = TRUE;
 863                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 864                 }
 865                 kfree(cifsFile->search_resume_name);
 866                 cifsFile->search_resume_name = NULL; */
 867
 868                 /* BB account for . and .. in f_pos as special case */
 869                 /* dump_cifs_file_struct(file, "rdir after default ");*/
 870
 871                 rc = find_cifs_entry(xid,pTcon, file,
 872                                 &current_entry,&num_to_fill);
 873                 if(rc) {
 874                         cFYI(1,("fce error %d",rc));
 875                         goto rddir2_exit;
 876                 } else if (current_entry != NULL) {
 877                         cFYI(1,("entry %lld found",file->f_pos));
 878                 } else {
 879                         cFYI(1,("could not find entry"));
 880                         goto rddir2_exit;
 881                 }
 882                 cFYI(1,("loop through %d times filling dir for net buf %p",
 883                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
 884                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 885                         smbCalcSize((struct smb_hdr *)
 886                                     cifsFile->srch_inf.ntwrk_buf_start);
 887                 /* To be safe - for UCS to UTF-8 with strings loaded
 888                 with the rare long characters alloc more to account for
 889                 such multibyte target UTF-8 characters. cifs_unicode.c,
 890                 which actually does the conversion, has the same limit */
 891                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
 892                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
 893                         if(current_entry == NULL) {
 894                                 /* evaluate whether this case is an error */
 895                                 cERROR(1,("past end of SMB num to fill %d i %d",
 896                                           num_to_fill, i));
 897                                 break;
 898                         }
 899
 900                         rc = cifs_filldir(current_entry, file,
 901                                         filldir, direntry,tmp_buf);
 902                         file->f_pos++;
 903                         if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
 904                                 cFYI(1,("last entry in buf at pos %lld %s",
 905                                         file->f_pos,tmp_buf)); /* BB removeme BB */
 906                                 cifs_save_resume_key(current_entry,cifsFile);
 907                                 break;
 908                         } else
 909                                 current_entry = nxt_dir_entry(current_entry,end_of_smb);
 910                 }
 911                 kfree(tmp_buf);
 912                 break;
 913         } /* end switch */
 914
 915 rddir2_exit:
 916         /* dump_cifs_file_struct(file, "end rdir ");  */
 917         FreeXid(xid);
 918         return rc;
 919 }