SAFE public projects git trees. - safe/jmp/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                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 198                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 199                         else
 200                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 201
 202                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 203                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 204                 else
 205                         tmp_inode->i_fop = &cifs_file_ops;
 206                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 207                         tmp_inode->i_fop->lock = NULL;
 208                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 209                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 210                    (cifs_sb->tcon->ses->server->maxBuf <
 211                         4096 + MAX_CIFS_HDR_SIZE))
 212                         tmp_inode->i_data.a_ops->readpages = NULL;
 213                 if(isNewInode)
 214                         return; /* No sense invalidating pages for new inode
 215                                    since have not started caching readahead file
 216                                    data yet */
 217
 218                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 219                         (local_size == tmp_inode->i_size)) {
 220                         cFYI(1, ("inode exists but unchanged"));
 221                 } else {
 222                         /* file may have changed on server */
 223                         cFYI(1, ("invalidate inode, readdir detected change"));
 224                         invalidate_remote_inode(tmp_inode);
 225                 }
 226         } else if (S_ISDIR(tmp_inode->i_mode)) {
 227                 cFYI(1, ("Directory inode"));
 228                 tmp_inode->i_op = &cifs_dir_inode_ops;
 229                 tmp_inode->i_fop = &cifs_dir_ops;
 230         } else if (S_ISLNK(tmp_inode->i_mode)) {
 231                 cFYI(1, ("Symbolic Link inode"));
 232                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 233         } else {
 234                 cFYI(1, ("Init special inode"));
 235                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 236                                    tmp_inode->i_rdev);
 237         }
 238 }
 239
 240 static void unix_fill_in_inode(struct inode *tmp_inode,
 241         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 242 {
 243         loff_t local_size;
 244         struct timespec local_mtime;
 245
 246         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 247         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 248
 249         __u32 type = le32_to_cpu(pfindData->Type);
 250         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 251         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 252         cifsInfo->time = jiffies;
 253         atomic_inc(&cifsInfo->inUse);
 254
 255         /* save mtime and size */
 256         local_mtime = tmp_inode->i_mtime;
 257         local_size  = tmp_inode->i_size;
 258
 259         tmp_inode->i_atime =
 260             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 261         tmp_inode->i_mtime =
 262             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 263         tmp_inode->i_ctime =
 264             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 265
 266         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 267         if (type == UNIX_FILE) {
 268                 *pobject_type = DT_REG;
 269                 tmp_inode->i_mode |= S_IFREG;
 270         } else if (type == UNIX_SYMLINK) {
 271                 *pobject_type = DT_LNK;
 272                 tmp_inode->i_mode |= S_IFLNK;
 273         } else if (type == UNIX_DIR) {
 274                 *pobject_type = DT_DIR;
 275                 tmp_inode->i_mode |= S_IFDIR;
 276         } else if (type == UNIX_CHARDEV) {
 277                 *pobject_type = DT_CHR;
 278                 tmp_inode->i_mode |= S_IFCHR;
 279                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 280                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 281         } else if (type == UNIX_BLOCKDEV) {
 282                 *pobject_type = DT_BLK;
 283                 tmp_inode->i_mode |= S_IFBLK;
 284                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 285                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 286         } else if (type == UNIX_FIFO) {
 287                 *pobject_type = DT_FIFO;
 288                 tmp_inode->i_mode |= S_IFIFO;
 289         } else if (type == UNIX_SOCKET) {
 290                 *pobject_type = DT_SOCK;
 291                 tmp_inode->i_mode |= S_IFSOCK;
 292         }
 293
 294         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 295         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 296         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 297
 298         if (is_size_safe_to_change(cifsInfo)) {
 299                 /* can not safely change the file size here if the
 300                 client is writing to it due to potential races */
 301                 i_size_write(tmp_inode,end_of_file);
 302
 303         /* 512 bytes (2**9) is the fake blocksize that must be used */
 304         /* for this calculation, not the real blocksize */
 305                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 306         }
 307
 308         if (S_ISREG(tmp_inode->i_mode)) {
 309                 cFYI(1, ("File inode"));
 310                 tmp_inode->i_op = &cifs_file_inode_ops;
 311                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 312                         tmp_inode->i_fop = &cifs_file_direct_ops;
 313                 else
 314                         tmp_inode->i_fop = &cifs_file_ops;
 315                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 316                         tmp_inode->i_fop->lock = NULL;
 317                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 318                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 319                    (cifs_sb->tcon->ses->server->maxBuf <
 320                         4096 + MAX_CIFS_HDR_SIZE))
 321                         tmp_inode->i_data.a_ops->readpages = NULL;
 322
 323                 if(isNewInode)
 324                         return; /* No sense invalidating pages for new inode since we
 325                                            have not started caching readahead file data yet */
 326
 327                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 328                         (local_size == tmp_inode->i_size)) {
 329                         cFYI(1, ("inode exists but unchanged"));
 330                 } else {
 331                         /* file may have changed on server */
 332                         cFYI(1, ("invalidate inode, readdir detected change"));
 333                         invalidate_remote_inode(tmp_inode);
 334                 }
 335         } else if (S_ISDIR(tmp_inode->i_mode)) {
 336                 cFYI(1, ("Directory inode"));
 337                 tmp_inode->i_op = &cifs_dir_inode_ops;
 338                 tmp_inode->i_fop = &cifs_dir_ops;
 339         } else if (S_ISLNK(tmp_inode->i_mode)) {
 340                 cFYI(1, ("Symbolic Link inode"));
 341                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 342 /* tmp_inode->i_fop = *//* do not need to set to anything */
 343         } else {
 344                 cFYI(1, ("Special inode"));
 345                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 346                                    tmp_inode->i_rdev);
 347         }
 348 }
 349
 350 static int initiate_cifs_search(const int xid, struct file *file)
 351 {
 352         int rc = 0;
 353         char * full_path;
 354         struct cifsFileInfo * cifsFile;
 355         struct cifs_sb_info *cifs_sb;
 356         struct cifsTconInfo *pTcon;
 357
 358         if(file->private_data == NULL) {
 359                 file->private_data =
 360                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 361         }
 362
 363         if(file->private_data == NULL) {
 364                 return -ENOMEM;
 365         } else {
 366                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 367         }
 368         cifsFile = file->private_data;
 369         cifsFile->invalidHandle = TRUE;
 370         cifsFile->srch_inf.endOfSearch = FALSE;
 371
 372         if(file->f_dentry == NULL)
 373                 return -ENOENT;
 374
 375         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 376         if(cifs_sb == NULL)
 377                 return -EINVAL;
 378
 379         pTcon = cifs_sb->tcon;
 380         if(pTcon == NULL)
 381                 return -EINVAL;
 382
 383         down(&file->f_dentry->d_sb->s_vfs_rename_sem);
 384         full_path = build_path_from_dentry(file->f_dentry);
 385         up(&file->f_dentry->d_sb->s_vfs_rename_sem);
 386
 387         if(full_path == NULL) {
 388                 return -ENOMEM;
 389         }
 390
 391         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 392
 393 ffirst_retry:
 394         /* test for Unix extensions */
 395         if (pTcon->ses->capabilities & CAP_UNIX) {
 396                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 397         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 398                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 399         } else /* not srvinos - BB fixme add check for backlevel? */ {
 400                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 401         }
 402
 403         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 404                 &cifsFile->netfid, &cifsFile->srch_inf,
 405                 cifs_sb->mnt_cifs_flags &
 406                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 407         if(rc == 0)
 408                 cifsFile->invalidHandle = FALSE;
 409         if((rc == -EOPNOTSUPP) &&
 410                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 411                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 412                 goto ffirst_retry;
 413         }
 414         kfree(full_path);
 415         return rc;
 416 }
 417
 418 /* return length of unicode string in bytes */
 419 static int cifs_unicode_bytelen(char *str)
 420 {
 421         int len;
 422         __le16 * ustr = (__le16 *)str;
 423
 424         for(len=0;len <= PATH_MAX;len++) {
 425                 if(ustr[len] == 0)
 426                         return len << 1;
 427         }
 428         cFYI(1,("Unicode string longer than PATH_MAX found"));
 429         return len << 1;
 430 }
 431
 432 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
 433 {
 434         char * new_entry;
 435         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 436
 437         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 438         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 439         /* validate that new_entry is not past end of SMB */
 440         if(new_entry >= end_of_smb) {
 441                 cERROR(1,
 442                       ("search entry %p began after end of SMB %p old entry %p",
 443                         new_entry, end_of_smb, old_entry));
 444                 return NULL;
 445         } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
 446                 cERROR(1,("search entry %p extends after end of SMB %p",
 447                         new_entry, end_of_smb));
 448                 return NULL;
 449         } else
 450                 return new_entry;
 451
 452 }
 453
 454 #define UNICODE_DOT cpu_to_le16(0x2e)
 455
 456 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 457 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 458 {
 459         int rc = 0;
 460         char * filename = NULL;
 461         int len = 0;
 462
 463         if(cfile->srch_inf.info_level == 0x202) {
 464                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 465                 filename = &pFindData->FileName[0];
 466                 if(cfile->srch_inf.unicode) {
 467                         len = cifs_unicode_bytelen(filename);
 468                 } else {
 469                         /* BB should we make this strnlen of PATH_MAX? */
 470                         len = strnlen(filename, 5);
 471                 }
 472         } else if(cfile->srch_inf.info_level == 0x101) {
 473                 FILE_DIRECTORY_INFO * pFindData =
 474                         (FILE_DIRECTORY_INFO *)current_entry;
 475                 filename = &pFindData->FileName[0];
 476                 len = le32_to_cpu(pFindData->FileNameLength);
 477         } else if(cfile->srch_inf.info_level == 0x102) {
 478                 FILE_FULL_DIRECTORY_INFO * pFindData =
 479                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 480                 filename = &pFindData->FileName[0];
 481                 len = le32_to_cpu(pFindData->FileNameLength);
 482         } else if(cfile->srch_inf.info_level == 0x105) {
 483                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 484                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 485                 filename = &pFindData->FileName[0];
 486                 len = le32_to_cpu(pFindData->FileNameLength);
 487         } else if(cfile->srch_inf.info_level == 0x104) {
 488                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 489                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 490                 filename = &pFindData->FileName[0];
 491                 len = le32_to_cpu(pFindData->FileNameLength);
 492         } else {
 493                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 494         }
 495
 496         if(filename) {
 497                 if(cfile->srch_inf.unicode) {
 498                         __le16 *ufilename = (__le16 *)filename;
 499                         if(len == 2) {
 500                                 /* check for . */
 501                                 if(ufilename[0] == UNICODE_DOT)
 502                                         rc = 1;
 503                         } else if(len == 4) {
 504                                 /* check for .. */
 505                                 if((ufilename[0] == UNICODE_DOT)
 506                                    &&(ufilename[1] == UNICODE_DOT))
 507                                         rc = 2;
 508                         }
 509                 } else /* ASCII */ {
 510                         if(len == 1) {
 511                                 if(filename[0] == '.')
 512                                         rc = 1;
 513                         } else if(len == 2) {
 514                                 if((filename[0] == '.') && (filename[1] == '.'))
 515                                         rc = 2;
 516                         }
 517                 }
 518         }
 519
 520         return rc;
 521 }
 522
 523 /* Check if directory that we are searching has changed so we can decide
 524    whether we can use the cached search results from the previous search */
 525 static int is_dir_changed(struct file * file)
 526 {
 527         struct inode * inode;
 528         struct cifsInodeInfo *cifsInfo;
 529
 530         if(file->f_dentry == NULL)
 531                 return 0;
 532
 533         inode = file->f_dentry->d_inode;
 534
 535         if(inode == NULL)
 536                 return 0;
 537
 538         cifsInfo = CIFS_I(inode);
 539
 540         if(cifsInfo->time == 0)
 541                 return 1; /* directory was changed, perhaps due to unlink */
 542         else
 543                 return 0;
 544
 545 }
 546
 547 /* find the corresponding entry in the search */
 548 /* Note that the SMB server returns search entries for . and .. which
 549    complicates logic here if we choose to parse for them and we do not
 550    assume that they are located in the findfirst return buffer.*/
 551 /* We start counting in the buffer with entry 2 and increment for every
 552    entry (do not increment for . or .. entry) */
 553 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 554         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 555 {
 556         int rc = 0;
 557         int pos_in_buf = 0;
 558         loff_t first_entry_in_buffer;
 559         loff_t index_to_find = file->f_pos;
 560         struct cifsFileInfo * cifsFile = file->private_data;
 561         /* check if index in the buffer */
 562
 563         if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 564            (num_to_ret == NULL))
 565                 return -ENOENT;
 566
 567         *ppCurrentEntry = NULL;
 568         first_entry_in_buffer =
 569                 cifsFile->srch_inf.index_of_last_entry -
 570                         cifsFile->srch_inf.entries_in_buffer;
 571 /*      dump_cifs_file_struct(file, "In fce ");*/
 572         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 573              is_dir_changed(file)) ||
 574            (index_to_find < first_entry_in_buffer)) {
 575                 /* close and restart search */
 576                 cFYI(1,("search backing up - close and restart search"));
 577                 cifsFile->invalidHandle = TRUE;
 578                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 579                 kfree(cifsFile->search_resume_name);
 580                 cifsFile->search_resume_name = NULL;
 581                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 582                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 583                         cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
 584                 }
 585                 rc = initiate_cifs_search(xid,file);
 586                 if(rc) {
 587                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 588                         return rc;
 589                 }
 590         }
 591
 592         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 593               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 594                 cFYI(1,("calling findnext2"));
 595                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 596                                   &cifsFile->srch_inf);
 597                 if(rc)
 598                         return -ENOENT;
 599         }
 600         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 601                 /* we found the buffer that contains the entry */
 602                 /* scan and find it */
 603                 int i;
 604                 char * current_entry;
 605                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 606                         smbCalcSize((struct smb_hdr *)
 607                                 cifsFile->srch_inf.ntwrk_buf_start);
 608                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 609                                         - cifsFile->srch_inf.entries_in_buffer;
 610                 pos_in_buf = index_to_find - first_entry_in_buffer;
 611                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 612                 current_entry = cifsFile->srch_inf.srch_entries_start;
 613                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 614                         /* go entry by entry figuring out which is first */
 615                         /* if( . or ..)
 616                                 skip */
 617                         rc = cifs_entry_is_dot(current_entry,cifsFile);
 618                         if(rc == 1) /* is . or .. so skip */ {
 619                                 cFYI(1,("Entry is .")); /* BB removeme BB */
 620                                 /* continue; */
 621                         } else if (rc == 2 ) {
 622                                 cFYI(1,("Entry is ..")); /* BB removeme BB */
 623                                 /* continue; */
 624                         }
 625                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
 626                 }
 627                 if((current_entry == NULL) && (i < pos_in_buf)) {
 628                         /* BB fixme - check if we should flag this error */
 629                         cERROR(1,("reached end of buf searching for pos in buf"
 630                           " %d index to find %lld rc %d",
 631                           pos_in_buf,index_to_find,rc));
 632                 }
 633                 rc = 0;
 634                 *ppCurrentEntry = current_entry;
 635         } else {
 636                 cFYI(1,("index not in buffer - could not findnext into it"));
 637                 return 0;
 638         }
 639
 640         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 641                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 642                 *num_to_ret = 0;
 643         } else
 644                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 645
 646         return rc;
 647 }
 648
 649 /* inode num, inode type and filename returned */
 650 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 651         char *current_entry, __u16 level, unsigned int unicode,
 652         struct cifs_sb_info * cifs_sb, ino_t *pinum)
 653 {
 654         int rc = 0;
 655         unsigned int len = 0;
 656         char * filename;
 657         struct nls_table * nlt = cifs_sb->local_nls;
 658
 659         *pinum = 0;
 660
 661         if(level == SMB_FIND_FILE_UNIX) {
 662                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 663
 664                 filename = &pFindData->FileName[0];
 665                 if(unicode) {
 666                         len = cifs_unicode_bytelen(filename);
 667                 } else {
 668                         /* BB should we make this strnlen of PATH_MAX? */
 669                         len = strnlen(filename, PATH_MAX);
 670                 }
 671
 672                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 673                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 674                         *pinum = pFindData->UniqueId;
 675         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 676                 FILE_DIRECTORY_INFO * pFindData =
 677                         (FILE_DIRECTORY_INFO *)current_entry;
 678                 filename = &pFindData->FileName[0];
 679                 len = le32_to_cpu(pFindData->FileNameLength);
 680         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 681                 FILE_FULL_DIRECTORY_INFO * pFindData =
 682                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 683                 filename = &pFindData->FileName[0];
 684                 len = le32_to_cpu(pFindData->FileNameLength);
 685         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 686                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 687                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 688                 filename = &pFindData->FileName[0];
 689                 len = le32_to_cpu(pFindData->FileNameLength);
 690                 *pinum = pFindData->UniqueId;
 691         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 692                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 693                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 694                 filename = &pFindData->FileName[0];
 695                 len = le32_to_cpu(pFindData->FileNameLength);
 696         } else {
 697                 cFYI(1,("Unknown findfirst level %d",level));
 698                 return -EINVAL;
 699         }
 700         if(unicode) {
 701                 /* BB fixme - test with long names */
 702                 /* Note converted filename can be longer than in unicode */
 703                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 704                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 705                                         (__le16 *)filename, len/2, nlt);
 706                 else
 707                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 708                                         (wchar_t *)filename,len/2,nlt);
 709         } else {
 710                 pqst->name = filename;
 711                 pqst->len = len;
 712         }
 713         pqst->hash = full_name_hash(pqst->name,pqst->len);
 714 /*      cFYI(1,("filldir on %s",pqst->name));  */
 715         return rc;
 716 }
 717
 718 static int cifs_filldir(char *pfindEntry, struct file *file,
 719         filldir_t filldir, void *direntry, char *scratch_buf)
 720 {
 721         int rc = 0;
 722         struct qstr qstring;
 723         struct cifsFileInfo * pCifsF;
 724         unsigned obj_type;
 725         ino_t  inum;
 726         struct cifs_sb_info * cifs_sb;
 727         struct inode *tmp_inode;
 728         struct dentry *tmp_dentry;
 729
 730         /* get filename and len into qstring */
 731         /* get dentry */
 732         /* decide whether to create and populate ionde */
 733         if((direntry == NULL) || (file == NULL))
 734                 return -EINVAL;
 735
 736         pCifsF = file->private_data;
 737
 738         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 739                 return -ENOENT;
 740
 741         if(file->f_dentry == NULL)
 742                 return -ENOENT;
 743
 744         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 745
 746         qstring.name = scratch_buf;
 747         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 748                         pCifsF->srch_inf.info_level,
 749                         pCifsF->srch_inf.unicode,cifs_sb,
 750                         &inum /* returned */);
 751
 752         if(rc)
 753                 return rc;
 754
 755         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 756         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 757                 return -ENOMEM;
 758
 759         if(rc) {
 760                 /* inode created, we need to hash it with right inode number */
 761                 if(inum != 0) {
 762                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 763                         tmp_inode->i_ino = inum;
 764                 }
 765                 insert_inode_hash(tmp_inode);
 766         }
 767
 768         /* we pass in rc below, indicating whether it is a new inode,
 769            so we can figure out whether to invalidate the inode cached
 770            data if the file has changed */
 771         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 772                 unix_fill_in_inode(tmp_inode,
 773                                    (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
 774         } else {
 775                 fill_in_inode(tmp_inode,
 776                               (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
 777         }
 778
 779         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 780                      tmp_inode->i_ino,obj_type);
 781         if(rc) {
 782                 cFYI(1,("filldir rc = %d",rc));
 783         }
 784
 785         dput(tmp_dentry);
 786         return rc;
 787 }
 788
 789 static int cifs_save_resume_key(const char *current_entry,
 790         struct cifsFileInfo *cifsFile)
 791 {
 792         int rc = 0;
 793         unsigned int len = 0;
 794         __u16 level;
 795         char * filename;
 796
 797         if((cifsFile == NULL) || (current_entry == NULL))
 798                 return -EINVAL;
 799
 800         level = cifsFile->srch_inf.info_level;
 801
 802         if(level == SMB_FIND_FILE_UNIX) {
 803                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 804
 805                 filename = &pFindData->FileName[0];
 806                 if(cifsFile->srch_inf.unicode) {
 807                         len = cifs_unicode_bytelen(filename);
 808                 } else {
 809                         /* BB should we make this strnlen of PATH_MAX? */
 810                         len = strnlen(filename, PATH_MAX);
 811                 }
 812                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 813         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 814                 FILE_DIRECTORY_INFO * pFindData =
 815                         (FILE_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_FULL_DIRECTORY_INFO) {
 820                 FILE_FULL_DIRECTORY_INFO * pFindData =
 821                         (FILE_FULL_DIRECTORY_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_ID_FULL_DIR_INFO) {
 826                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 827                         (SEARCH_ID_FULL_DIR_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 if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 832                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 833                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 834                 filename = &pFindData->FileName[0];
 835                 len = le32_to_cpu(pFindData->FileNameLength);
 836                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 837         } else {
 838                 cFYI(1,("Unknown findfirst level %d",level));
 839                 return -EINVAL;
 840         }
 841         cifsFile->srch_inf.resume_name_len = len;
 842         cifsFile->srch_inf.presume_name = filename;
 843         return rc;
 844 }
 845
 846 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 847 {
 848         int rc = 0;
 849         int xid,i;
 850         struct cifs_sb_info *cifs_sb;
 851         struct cifsTconInfo *pTcon;
 852         struct cifsFileInfo *cifsFile = NULL;
 853         char * current_entry;
 854         int num_to_fill = 0;
 855         char * tmp_buf = NULL;
 856         char * end_of_smb;
 857
 858         xid = GetXid();
 859
 860         if(file->f_dentry == NULL) {
 861                 FreeXid(xid);
 862                 return -EIO;
 863         }
 864
 865         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 866         pTcon = cifs_sb->tcon;
 867         if(pTcon == NULL)
 868                 return -EINVAL;
 869
 870         switch ((int) file->f_pos) {
 871         case 0:
 872                 /*if (filldir(direntry, ".", 1, file->f_pos,
 873                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 874                         cERROR(1, ("Filldir for current dir failed "));
 875                         rc = -ENOMEM;
 876                         break;
 877                 }
 878                 file->f_pos++; */
 879         case 1:
 880                 /* if (filldir(direntry, "..", 2, file->f_pos,
 881                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 882                         cERROR(1, ("Filldir for parent dir failed "));
 883                         rc = -ENOMEM;
 884                         break;
 885                 }
 886                 file->f_pos++; */
 887         case 2:
 888                 /* 1) If search is active,
 889                         is in current search buffer?
 890                         if it before then restart search
 891                         if after then keep searching till find it */
 892
 893                 if(file->private_data == NULL) {
 894                         rc = initiate_cifs_search(xid,file);
 895                         cFYI(1,("initiate cifs search rc %d",rc));
 896                         if(rc) {
 897                                 FreeXid(xid);
 898                                 return rc;
 899                         }
 900                 }
 901         default:
 902                 if(file->private_data == NULL) {
 903                         rc = -EINVAL;
 904                         FreeXid(xid);
 905                         return rc;
 906                 }
 907                 cifsFile = file->private_data;
 908                 if (cifsFile->srch_inf.endOfSearch) {
 909                         if(cifsFile->srch_inf.emptyDir) {
 910                                 cFYI(1, ("End of search, empty dir"));
 911                                 rc = 0;
 912                                 break;
 913                         }
 914                 } /* else {
 915                         cifsFile->invalidHandle = TRUE;
 916                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 917                 }
 918                 kfree(cifsFile->search_resume_name);
 919                 cifsFile->search_resume_name = NULL; */
 920
 921                 /* BB account for . and .. in f_pos as special case */
 922
 923                 rc = find_cifs_entry(xid,pTcon, file,
 924                                 &current_entry,&num_to_fill);
 925                 if(rc) {
 926                         cFYI(1,("fce error %d",rc));
 927                         goto rddir2_exit;
 928                 } else if (current_entry != NULL) {
 929                         cFYI(1,("entry %lld found",file->f_pos));
 930                 } else {
 931                         cFYI(1,("could not find entry"));
 932                         goto rddir2_exit;
 933                 }
 934                 cFYI(1,("loop through %d times filling dir for net buf %p",
 935                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
 936                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 937                         smbCalcSize((struct smb_hdr *)
 938                                     cifsFile->srch_inf.ntwrk_buf_start);
 939                 /* To be safe - for UCS to UTF-8 with strings loaded
 940                 with the rare long characters alloc more to account for
 941                 such multibyte target UTF-8 characters. cifs_unicode.c,
 942                 which actually does the conversion, has the same limit */
 943                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
 944                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
 945                         if(current_entry == NULL) {
 946                                 /* evaluate whether this case is an error */
 947                                 cERROR(1,("past end of SMB num to fill %d i %d",
 948                                           num_to_fill, i));
 949                                 break;
 950                         }
 951
 952                         rc = cifs_filldir(current_entry, file,
 953                                         filldir, direntry,tmp_buf);
 954                         file->f_pos++;
 955                         if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
 956                                 cFYI(1,("last entry in buf at pos %lld %s",
 957                                         file->f_pos,tmp_buf)); /* BB removeme BB */
 958                                 cifs_save_resume_key(current_entry,cifsFile);
 959                                 break;
 960                         } else
 961                                 current_entry = nxt_dir_entry(current_entry,
 962                                                               end_of_smb);
 963                 }
 964                 kfree(tmp_buf);
 965                 break;
 966         } /* end switch */
 967
 968 rddir2_exit:
 969         FreeXid(xid);
 970         return rc;
 971 }