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   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004, 2008
   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/pagemap.h>
  25 #include <linux/stat.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 /*
  35  * To be safe - for UCS to UTF-8 with strings loaded with the rare long
  36  * characters alloc more to account for such multibyte target UTF-8
  37  * characters.
  38  */
  39 #define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
  40
  41 #ifdef CONFIG_CIFS_DEBUG2
  42 static void dump_cifs_file_struct(struct file *file, char *label)
  43 {
  44         struct cifsFileInfo *cf;
  45
  46         if (file) {
  47                 cf = file->private_data;
  48                 if (cf == NULL) {
  49                         cFYI(1, ("empty cifs private file data"));
  50                         return;
  51                 }
  52                 if (cf->invalidHandle)
  53                         cFYI(1, ("invalid handle"));
  54                 if (cf->srch_inf.endOfSearch)
  55                         cFYI(1, ("end of search"));
  56                 if (cf->srch_inf.emptyDir)
  57                         cFYI(1, ("empty dir"));
  58         }
  59 }
  60 #else
  61 static inline void dump_cifs_file_struct(struct file *file, char *label)
  62 {
  63 }
  64 #endif /* DEBUG2 */
  65
  66 /* Returns 1 if new inode created, 2 if both dentry and inode were */
  67 /* Might check in the future if inode number changed so we can rehash inode */
  68 static int
  69 construct_dentry(struct qstr *qstring, struct file *file,
  70                  struct inode **ptmp_inode, struct dentry **pnew_dentry,
  71                  __u64 *inum)
  72 {
  73         struct dentry *tmp_dentry = NULL;
  74         struct super_block *sb = file->f_path.dentry->d_sb;
  75         int rc = 0;
  76
  77         cFYI(1, ("For %s", qstring->name));
  78
  79         qstring->hash = full_name_hash(qstring->name, qstring->len);
  80         tmp_dentry = d_lookup(file->f_path.dentry, qstring);
  81         if (tmp_dentry) {
  82                 /* BB: overwrite old name? i.e. tmp_dentry->d_name and
  83                  * tmp_dentry->d_name.len??
  84                  */
  85                 cFYI(0, ("existing dentry with inode 0x%p",
  86                          tmp_dentry->d_inode));
  87                 *ptmp_inode = tmp_dentry->d_inode;
  88                 if (*ptmp_inode == NULL) {
  89                         *ptmp_inode = cifs_new_inode(sb, inum);
  90                         if (*ptmp_inode == NULL)
  91                                 return rc;
  92                         rc = 1;
  93                 }
  94         } else {
  95                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
  96                 if (tmp_dentry == NULL) {
  97                         cERROR(1, ("Failed allocating dentry"));
  98                         *ptmp_inode = NULL;
  99                         return rc;
 100                 }
 101
 102                 if (CIFS_SB(sb)->tcon->nocase)
 103                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
 104                 else
 105                         tmp_dentry->d_op = &cifs_dentry_ops;
 106
 107                 *ptmp_inode = cifs_new_inode(sb, inum);
 108                 if (*ptmp_inode == NULL)
 109                         return rc;
 110                 rc = 2;
 111         }
 112
 113         tmp_dentry->d_time = jiffies;
 114         *pnew_dentry = tmp_dentry;
 115         return rc;
 116 }
 117
 118 static void AdjustForTZ(struct cifsTconInfo *tcon, struct inode *inode)
 119 {
 120         if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
 121                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
 122                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
 123                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
 124         }
 125         return;
 126 }
 127
 128
 129 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
 130                           char *buf, unsigned int *pobject_type, int isNewInode)
 131 {
 132         loff_t local_size;
 133         struct timespec local_mtime;
 134
 135         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 136         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 137         __u32 attr;
 138         __u64 allocation_size;
 139         __u64 end_of_file;
 140         umode_t default_mode;
 141
 142         /* save mtime and size */
 143         local_mtime = tmp_inode->i_mtime;
 144         local_size  = tmp_inode->i_size;
 145
 146         if (new_buf_type) {
 147                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
 148
 149                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 150                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 151                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 152                 tmp_inode->i_atime =
 153                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 154                 tmp_inode->i_mtime =
 155                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 156                 tmp_inode->i_ctime =
 157                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 158         } else { /* legacy, OS2 and DOS style */
 159 /*              struct timespec ts;*/
 160                 FIND_FILE_STANDARD_INFO *pfindData =
 161                         (FIND_FILE_STANDARD_INFO *)buf;
 162
 163                 tmp_inode->i_mtime = cnvrtDosUnixTm(
 164                                 le16_to_cpu(pfindData->LastWriteDate),
 165                                 le16_to_cpu(pfindData->LastWriteTime));
 166                 tmp_inode->i_atime = cnvrtDosUnixTm(
 167                                 le16_to_cpu(pfindData->LastAccessDate),
 168                                 le16_to_cpu(pfindData->LastAccessTime));
 169                 tmp_inode->i_ctime = cnvrtDosUnixTm(
 170                                 le16_to_cpu(pfindData->LastWriteDate),
 171                                 le16_to_cpu(pfindData->LastWriteTime));
 172                 AdjustForTZ(cifs_sb->tcon, tmp_inode);
 173                 attr = le16_to_cpu(pfindData->Attributes);
 174                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
 175                 end_of_file = le32_to_cpu(pfindData->DataSize);
 176         }
 177
 178         /* Linux can not store file creation time unfortunately so ignore it */
 179
 180         cifsInfo->cifsAttrs = attr;
 181 #ifdef CONFIG_CIFS_EXPERIMENTAL
 182         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 183                 /* get more accurate mode via ACL - so force inode refresh */
 184                 cifsInfo->time = 0;
 185         } else
 186 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 187                 cifsInfo->time = jiffies;
 188
 189         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 190         /* 2767 perms - indicate mandatory locking */
 191                 /* BB fill in uid and gid here? with help from winbind?
 192                    or retrieve from NTFS stream extended attribute */
 193         if (atomic_read(&cifsInfo->inUse) == 0) {
 194                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 195                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 196         }
 197
 198         if (attr & ATTR_DIRECTORY)
 199                 default_mode = cifs_sb->mnt_dir_mode;
 200         else
 201                 default_mode = cifs_sb->mnt_file_mode;
 202
 203         /* set initial permissions */
 204         if ((atomic_read(&cifsInfo->inUse) == 0) ||
 205             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
 206                 tmp_inode->i_mode = default_mode;
 207         else {
 208                 /* just reenable write bits if !ATTR_READONLY */
 209                 if ((tmp_inode->i_mode & S_IWUGO) == 0 &&
 210                     (attr & ATTR_READONLY) == 0)
 211                         tmp_inode->i_mode |= (S_IWUGO & default_mode);
 212
 213                 tmp_inode->i_mode &= ~S_IFMT;
 214         }
 215
 216         /* clear write bits if ATTR_READONLY is set */
 217         if (attr & ATTR_READONLY)
 218                 tmp_inode->i_mode &= ~S_IWUGO;
 219
 220         /* set inode type */
 221         if ((attr & ATTR_SYSTEM) &&
 222             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
 223                 if (end_of_file == 0)  {
 224                         tmp_inode->i_mode |= S_IFIFO;
 225                         *pobject_type = DT_FIFO;
 226                 } else {
 227                         /*
 228                          * trying to get the type can be slow, so just call
 229                          * this a regular file for now, and mark for reval
 230                          */
 231                         tmp_inode->i_mode |= S_IFREG;
 232                         *pobject_type = DT_REG;
 233                         cifsInfo->time = 0;
 234                 }
 235         } else {
 236                 if (attr & ATTR_DIRECTORY) {
 237                         tmp_inode->i_mode |= S_IFDIR;
 238                         *pobject_type = DT_DIR;
 239                 } else {
 240                         tmp_inode->i_mode |= S_IFREG;
 241                         *pobject_type = DT_REG;
 242                 }
 243         }
 244
 245         /* can not fill in nlink here as in qpathinfo version and Unx search */
 246         if (atomic_read(&cifsInfo->inUse) == 0)
 247                 atomic_set(&cifsInfo->inUse, 1);
 248
 249         cifsInfo->server_eof = end_of_file;
 250         spin_lock(&tmp_inode->i_lock);
 251         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 252                 /* can not safely change the file size here if the
 253                 client is writing to it due to potential races */
 254                 i_size_write(tmp_inode, end_of_file);
 255
 256         /* 512 bytes (2**9) is the fake blocksize that must be used */
 257         /* for this calculation, even though the reported blocksize is larger */
 258                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 259         }
 260         spin_unlock(&tmp_inode->i_lock);
 261
 262         if (allocation_size < end_of_file)
 263                 cFYI(1, ("May be sparse file, allocation less than file size"));
 264         cFYI(1, ("File Size %ld and blocks %llu",
 265                 (unsigned long)tmp_inode->i_size,
 266                 (unsigned long long)tmp_inode->i_blocks));
 267         if (S_ISREG(tmp_inode->i_mode)) {
 268                 cFYI(1, ("File inode"));
 269                 tmp_inode->i_op = &cifs_file_inode_ops;
 270                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 271                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 272                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 273                         else
 274                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 275                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 276                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 277                 else
 278                         tmp_inode->i_fop = &cifs_file_ops;
 279
 280                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 281                    (cifs_sb->tcon->ses->server->maxBuf <
 282                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 283                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 284                 else
 285                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 286
 287                 if (isNewInode)
 288                         return; /* No sense invalidating pages for new inode
 289                                    since have not started caching readahead file
 290                                    data yet */
 291
 292                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 293                         (local_size == tmp_inode->i_size)) {
 294                         cFYI(1, ("inode exists but unchanged"));
 295                 } else {
 296                         /* file may have changed on server */
 297                         cFYI(1, ("invalidate inode, readdir detected change"));
 298                         invalidate_remote_inode(tmp_inode);
 299                 }
 300         } else if (S_ISDIR(tmp_inode->i_mode)) {
 301                 cFYI(1, ("Directory inode"));
 302                 tmp_inode->i_op = &cifs_dir_inode_ops;
 303                 tmp_inode->i_fop = &cifs_dir_ops;
 304         } else if (S_ISLNK(tmp_inode->i_mode)) {
 305                 cFYI(1, ("Symbolic Link inode"));
 306                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 307         } else {
 308                 cFYI(1, ("Init special inode"));
 309                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 310                                    tmp_inode->i_rdev);
 311         }
 312 }
 313
 314 static void unix_fill_in_inode(struct inode *tmp_inode,
 315         FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
 316 {
 317         loff_t local_size;
 318         struct timespec local_mtime;
 319
 320         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 321         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 322
 323         __u32 type = le32_to_cpu(pfindData->Type);
 324         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 325         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 326         cifsInfo->time = jiffies;
 327         atomic_inc(&cifsInfo->inUse);
 328
 329         /* save mtime and size */
 330         local_mtime = tmp_inode->i_mtime;
 331         local_size  = tmp_inode->i_size;
 332
 333         tmp_inode->i_atime =
 334             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 335         tmp_inode->i_mtime =
 336             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 337         tmp_inode->i_ctime =
 338             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 339
 340         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 341         /* since we set the inode type below we need to mask off type
 342            to avoid strange results if bits above were corrupt */
 343         tmp_inode->i_mode &= ~S_IFMT;
 344         if (type == UNIX_FILE) {
 345                 *pobject_type = DT_REG;
 346                 tmp_inode->i_mode |= S_IFREG;
 347         } else if (type == UNIX_SYMLINK) {
 348                 *pobject_type = DT_LNK;
 349                 tmp_inode->i_mode |= S_IFLNK;
 350         } else if (type == UNIX_DIR) {
 351                 *pobject_type = DT_DIR;
 352                 tmp_inode->i_mode |= S_IFDIR;
 353         } else if (type == UNIX_CHARDEV) {
 354                 *pobject_type = DT_CHR;
 355                 tmp_inode->i_mode |= S_IFCHR;
 356                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 357                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 358         } else if (type == UNIX_BLOCKDEV) {
 359                 *pobject_type = DT_BLK;
 360                 tmp_inode->i_mode |= S_IFBLK;
 361                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 362                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 363         } else if (type == UNIX_FIFO) {
 364                 *pobject_type = DT_FIFO;
 365                 tmp_inode->i_mode |= S_IFIFO;
 366         } else if (type == UNIX_SOCKET) {
 367                 *pobject_type = DT_SOCK;
 368                 tmp_inode->i_mode |= S_IFSOCK;
 369         } else {
 370                 /* safest to just call it a file */
 371                 *pobject_type = DT_REG;
 372                 tmp_inode->i_mode |= S_IFREG;
 373                 cFYI(1, ("unknown inode type %d", type));
 374         }
 375
 376         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 377                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 378         else
 379                 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 380         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 381                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 382         else
 383                 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 384         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 385
 386         cifsInfo->server_eof = end_of_file;
 387         spin_lock(&tmp_inode->i_lock);
 388         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 389                 /* can not safely change the file size here if the
 390                 client is writing to it due to potential races */
 391                 i_size_write(tmp_inode, end_of_file);
 392
 393         /* 512 bytes (2**9) is the fake blocksize that must be used */
 394         /* for this calculation, not the real blocksize */
 395                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 396         }
 397         spin_unlock(&tmp_inode->i_lock);
 398
 399         if (S_ISREG(tmp_inode->i_mode)) {
 400                 cFYI(1, ("File inode"));
 401                 tmp_inode->i_op = &cifs_file_inode_ops;
 402
 403                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 404                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 405                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 406                         else
 407                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 408                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 409                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 410                 else
 411                         tmp_inode->i_fop = &cifs_file_ops;
 412
 413                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 414                    (cifs_sb->tcon->ses->server->maxBuf <
 415                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
 416                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 417                 else
 418                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 419
 420                 if (isNewInode)
 421                         return; /* No sense invalidating pages for new inode
 422                                    since we have not started caching readahead
 423                                    file data for it yet */
 424
 425                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 426                         (local_size == tmp_inode->i_size)) {
 427                         cFYI(1, ("inode exists but unchanged"));
 428                 } else {
 429                         /* file may have changed on server */
 430                         cFYI(1, ("invalidate inode, readdir detected change"));
 431                         invalidate_remote_inode(tmp_inode);
 432                 }
 433         } else if (S_ISDIR(tmp_inode->i_mode)) {
 434                 cFYI(1, ("Directory inode"));
 435                 tmp_inode->i_op = &cifs_dir_inode_ops;
 436                 tmp_inode->i_fop = &cifs_dir_ops;
 437         } else if (S_ISLNK(tmp_inode->i_mode)) {
 438                 cFYI(1, ("Symbolic Link inode"));
 439                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 440 /* tmp_inode->i_fop = *//* do not need to set to anything */
 441         } else {
 442                 cFYI(1, ("Special inode"));
 443                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 444                                    tmp_inode->i_rdev);
 445         }
 446 }
 447
 448 /* BB eventually need to add the following helper function to
 449       resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
 450       we try to do FindFirst on (NTFS) directory symlinks */
 451 /*
 452 int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
 453                              int xid)
 454 {
 455         __u16 fid;
 456         int len;
 457         int oplock = 0;
 458         int rc;
 459         struct cifsTconInfo *ptcon = cifs_sb->tcon;
 460         char *tmpbuffer;
 461
 462         rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
 463                         OPEN_REPARSE_POINT, &fid, &oplock, NULL,
 464                         cifs_sb->local_nls,
 465                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 466         if (!rc) {
 467                 tmpbuffer = kmalloc(maxpath);
 468                 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
 469                                 tmpbuffer,
 470                                 maxpath -1,
 471                                 fid,
 472                                 cifs_sb->local_nls);
 473                 if (CIFSSMBClose(xid, ptcon, fid)) {
 474                         cFYI(1, ("Error closing temporary reparsepoint open)"));
 475                 }
 476         }
 477 }
 478  */
 479
 480 static int initiate_cifs_search(const int xid, struct file *file)
 481 {
 482         int rc = 0;
 483         char *full_path;
 484         struct cifsFileInfo *cifsFile;
 485         struct cifs_sb_info *cifs_sb;
 486         struct cifsTconInfo *pTcon;
 487
 488         if (file->private_data == NULL) {
 489                 file->private_data =
 490                         kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
 491         }
 492
 493         if (file->private_data == NULL)
 494                 return -ENOMEM;
 495         cifsFile = file->private_data;
 496         cifsFile->invalidHandle = true;
 497         cifsFile->srch_inf.endOfSearch = false;
 498
 499         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 500         if (cifs_sb == NULL)
 501                 return -EINVAL;
 502
 503         pTcon = cifs_sb->tcon;
 504         if (pTcon == NULL)
 505                 return -EINVAL;
 506
 507         full_path = build_path_from_dentry(file->f_path.dentry);
 508
 509         if (full_path == NULL)
 510                 return -ENOMEM;
 511
 512         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 513
 514 ffirst_retry:
 515         /* test for Unix extensions */
 516         /* but now check for them on the share/mount not on the SMB session */
 517 /*      if (pTcon->ses->capabilities & CAP_UNIX) { */
 518         if (pTcon->unix_ext)
 519                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 520         else if ((pTcon->ses->capabilities &
 521                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
 522                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 523         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 524                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 525         } else /* not srvinos - BB fixme add check for backlevel? */ {
 526                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 527         }
 528
 529         rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
 530                 &cifsFile->netfid, &cifsFile->srch_inf,
 531                 cifs_sb->mnt_cifs_flags &
 532                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 533         if (rc == 0)
 534                 cifsFile->invalidHandle = false;
 535         /* BB add following call to handle readdir on new NTFS symlink errors
 536         else if STATUS_STOPPED_ON_SYMLINK
 537                 call get_symlink_reparse_path and retry with new path */
 538         else if ((rc == -EOPNOTSUPP) &&
 539                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 540                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 541                 goto ffirst_retry;
 542         }
 543         kfree(full_path);
 544         return rc;
 545 }
 546
 547 /* return length of unicode string in bytes */
 548 static int cifs_unicode_bytelen(char *str)
 549 {
 550         int len;
 551         __le16 *ustr = (__le16 *)str;
 552
 553         for (len = 0; len <= PATH_MAX; len++) {
 554                 if (ustr[len] == 0)
 555                         return len << 1;
 556         }
 557         cFYI(1, ("Unicode string longer than PATH_MAX found"));
 558         return len << 1;
 559 }
 560
 561 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 562 {
 563         char *new_entry;
 564         FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 565
 566         if (level == SMB_FIND_FILE_INFO_STANDARD) {
 567                 FIND_FILE_STANDARD_INFO *pfData;
 568                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 569
 570                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
 571                                 pfData->FileNameLength;
 572         } else
 573                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 574         cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
 575         /* validate that new_entry is not past end of SMB */
 576         if (new_entry >= end_of_smb) {
 577                 cERROR(1,
 578                       ("search entry %p began after end of SMB %p old entry %p",
 579                         new_entry, end_of_smb, old_entry));
 580                 return NULL;
 581         } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
 582                     (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
 583                   || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 584                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
 585                 cERROR(1, ("search entry %p extends after end of SMB %p",
 586                         new_entry, end_of_smb));
 587                 return NULL;
 588         } else
 589                 return new_entry;
 590
 591 }
 592
 593 #define UNICODE_DOT cpu_to_le16(0x2e)
 594
 595 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 596 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 597 {
 598         int rc = 0;
 599         char *filename = NULL;
 600         int len = 0;
 601
 602         if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 603                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
 604                 filename = &pFindData->FileName[0];
 605                 if (cfile->srch_inf.unicode) {
 606                         len = cifs_unicode_bytelen(filename);
 607                 } else {
 608                         /* BB should we make this strnlen of PATH_MAX? */
 609                         len = strnlen(filename, 5);
 610                 }
 611         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
 612                 FILE_DIRECTORY_INFO *pFindData =
 613                         (FILE_DIRECTORY_INFO *)current_entry;
 614                 filename = &pFindData->FileName[0];
 615                 len = le32_to_cpu(pFindData->FileNameLength);
 616         } else if (cfile->srch_inf.info_level ==
 617                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 618                 FILE_FULL_DIRECTORY_INFO *pFindData =
 619                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 620                 filename = &pFindData->FileName[0];
 621                 len = le32_to_cpu(pFindData->FileNameLength);
 622         } else if (cfile->srch_inf.info_level ==
 623                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 624                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 625                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 626                 filename = &pFindData->FileName[0];
 627                 len = le32_to_cpu(pFindData->FileNameLength);
 628         } else if (cfile->srch_inf.info_level ==
 629                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 630                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 631                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 632                 filename = &pFindData->FileName[0];
 633                 len = le32_to_cpu(pFindData->FileNameLength);
 634         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
 635                 FIND_FILE_STANDARD_INFO *pFindData =
 636                         (FIND_FILE_STANDARD_INFO *)current_entry;
 637                 filename = &pFindData->FileName[0];
 638                 len = pFindData->FileNameLength;
 639         } else {
 640                 cFYI(1, ("Unknown findfirst level %d",
 641                          cfile->srch_inf.info_level));
 642         }
 643
 644         if (filename) {
 645                 if (cfile->srch_inf.unicode) {
 646                         __le16 *ufilename = (__le16 *)filename;
 647                         if (len == 2) {
 648                                 /* check for . */
 649                                 if (ufilename[0] == UNICODE_DOT)
 650                                         rc = 1;
 651                         } else if (len == 4) {
 652                                 /* check for .. */
 653                                 if ((ufilename[0] == UNICODE_DOT)
 654                                    && (ufilename[1] == UNICODE_DOT))
 655                                         rc = 2;
 656                         }
 657                 } else /* ASCII */ {
 658                         if (len == 1) {
 659                                 if (filename[0] == '.')
 660                                         rc = 1;
 661                         } else if (len == 2) {
 662                                 if ((filename[0] == '.') && (filename[1] == '.'))
 663                                         rc = 2;
 664                         }
 665                 }
 666         }
 667
 668         return rc;
 669 }
 670
 671 /* Check if directory that we are searching has changed so we can decide
 672    whether we can use the cached search results from the previous search */
 673 static int is_dir_changed(struct file *file)
 674 {
 675         struct inode *inode = file->f_path.dentry->d_inode;
 676         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
 677
 678         if (cifsInfo->time == 0)
 679                 return 1; /* directory was changed, perhaps due to unlink */
 680         else
 681                 return 0;
 682
 683 }
 684
 685 static int cifs_save_resume_key(const char *current_entry,
 686         struct cifsFileInfo *cifsFile)
 687 {
 688         int rc = 0;
 689         unsigned int len = 0;
 690         __u16 level;
 691         char *filename;
 692
 693         if ((cifsFile == NULL) || (current_entry == NULL))
 694                 return -EINVAL;
 695
 696         level = cifsFile->srch_inf.info_level;
 697
 698         if (level == SMB_FIND_FILE_UNIX) {
 699                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
 700
 701                 filename = &pFindData->FileName[0];
 702                 if (cifsFile->srch_inf.unicode) {
 703                         len = cifs_unicode_bytelen(filename);
 704                 } else {
 705                         /* BB should we make this strnlen of PATH_MAX? */
 706                         len = strnlen(filename, PATH_MAX);
 707                 }
 708                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 709         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
 710                 FILE_DIRECTORY_INFO *pFindData =
 711                         (FILE_DIRECTORY_INFO *)current_entry;
 712                 filename = &pFindData->FileName[0];
 713                 len = le32_to_cpu(pFindData->FileNameLength);
 714                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 715         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 716                 FILE_FULL_DIRECTORY_INFO *pFindData =
 717                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 718                 filename = &pFindData->FileName[0];
 719                 len = le32_to_cpu(pFindData->FileNameLength);
 720                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 721         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 722                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 723                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 724                 filename = &pFindData->FileName[0];
 725                 len = le32_to_cpu(pFindData->FileNameLength);
 726                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 727         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 728                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 729                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 730                 filename = &pFindData->FileName[0];
 731                 len = le32_to_cpu(pFindData->FileNameLength);
 732                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 733         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
 734                 FIND_FILE_STANDARD_INFO *pFindData =
 735                         (FIND_FILE_STANDARD_INFO *)current_entry;
 736                 filename = &pFindData->FileName[0];
 737                 /* one byte length, no name conversion */
 738                 len = (unsigned int)pFindData->FileNameLength;
 739                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 740         } else {
 741                 cFYI(1, ("Unknown findfirst level %d", level));
 742                 return -EINVAL;
 743         }
 744         cifsFile->srch_inf.resume_name_len = len;
 745         cifsFile->srch_inf.presume_name = filename;
 746         return rc;
 747 }
 748
 749 /* find the corresponding entry in the search */
 750 /* Note that the SMB server returns search entries for . and .. which
 751    complicates logic here if we choose to parse for them and we do not
 752    assume that they are located in the findfirst return buffer.*/
 753 /* We start counting in the buffer with entry 2 and increment for every
 754    entry (do not increment for . or .. entry) */
 755 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 756         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 757 {
 758         int rc = 0;
 759         int pos_in_buf = 0;
 760         loff_t first_entry_in_buffer;
 761         loff_t index_to_find = file->f_pos;
 762         struct cifsFileInfo *cifsFile = file->private_data;
 763         /* check if index in the buffer */
 764
 765         if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 766            (num_to_ret == NULL))
 767                 return -ENOENT;
 768
 769         *ppCurrentEntry = NULL;
 770         first_entry_in_buffer =
 771                 cifsFile->srch_inf.index_of_last_entry -
 772                         cifsFile->srch_inf.entries_in_buffer;
 773
 774         /* if first entry in buf is zero then is first buffer
 775         in search response data which means it is likely . and ..
 776         will be in this buffer, although some servers do not return
 777         . and .. for the root of a drive and for those we need
 778         to start two entries earlier */
 779
 780         dump_cifs_file_struct(file, "In fce ");
 781         if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 782              is_dir_changed(file)) ||
 783            (index_to_find < first_entry_in_buffer)) {
 784                 /* close and restart search */
 785                 cFYI(1, ("search backing up - close and restart search"));
 786                 write_lock(&GlobalSMBSeslock);
 787                 if (!cifsFile->srch_inf.endOfSearch &&
 788                     !cifsFile->invalidHandle) {
 789                         cifsFile->invalidHandle = true;
 790                         write_unlock(&GlobalSMBSeslock);
 791                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 792                 } else
 793                         write_unlock(&GlobalSMBSeslock);
 794                 if (cifsFile->srch_inf.ntwrk_buf_start) {
 795                         cFYI(1, ("freeing SMB ff cache buf on search rewind"));
 796                         if (cifsFile->srch_inf.smallBuf)
 797                                 cifs_small_buf_release(cifsFile->srch_inf.
 798                                                 ntwrk_buf_start);
 799                         else
 800                                 cifs_buf_release(cifsFile->srch_inf.
 801                                                 ntwrk_buf_start);
 802                         cifsFile->srch_inf.ntwrk_buf_start = NULL;
 803                 }
 804                 rc = initiate_cifs_search(xid, file);
 805                 if (rc) {
 806                         cFYI(1, ("error %d reinitiating a search on rewind",
 807                                  rc));
 808                         return rc;
 809                 }
 810                 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
 811         }
 812
 813         while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 814               (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
 815                 cFYI(1, ("calling findnext2"));
 816                 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
 817                                   &cifsFile->srch_inf);
 818                 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
 819                 if (rc)
 820                         return -ENOENT;
 821         }
 822         if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 823                 /* we found the buffer that contains the entry */
 824                 /* scan and find it */
 825                 int i;
 826                 char *current_entry;
 827                 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 828                         smbCalcSize((struct smb_hdr *)
 829                                 cifsFile->srch_inf.ntwrk_buf_start);
 830
 831                 current_entry = cifsFile->srch_inf.srch_entries_start;
 832                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 833                                         - cifsFile->srch_inf.entries_in_buffer;
 834                 pos_in_buf = index_to_find - first_entry_in_buffer;
 835                 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
 836
 837                 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
 838                         /* go entry by entry figuring out which is first */
 839                         current_entry = nxt_dir_entry(current_entry, end_of_smb,
 840                                                 cifsFile->srch_inf.info_level);
 841                 }
 842                 if ((current_entry == NULL) && (i < pos_in_buf)) {
 843                         /* BB fixme - check if we should flag this error */
 844                         cERROR(1, ("reached end of buf searching for pos in buf"
 845                           " %d index to find %lld rc %d",
 846                           pos_in_buf, index_to_find, rc));
 847                 }
 848                 rc = 0;
 849                 *ppCurrentEntry = current_entry;
 850         } else {
 851                 cFYI(1, ("index not in buffer - could not findnext into it"));
 852                 return 0;
 853         }
 854
 855         if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 856                 cFYI(1, ("can not return entries pos_in_buf beyond last"));
 857                 *num_to_ret = 0;
 858         } else
 859                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 860
 861         return rc;
 862 }
 863
 864 /* inode num, inode type and filename returned */
 865 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 866         char *current_entry, __u16 level, unsigned int unicode,
 867         struct cifs_sb_info *cifs_sb, unsigned int max_len, __u64 *pinum)
 868 {
 869         int rc = 0;
 870         unsigned int len = 0;
 871         char *filename;
 872         struct nls_table *nlt = cifs_sb->local_nls;
 873
 874         *pinum = 0;
 875
 876         if (level == SMB_FIND_FILE_UNIX) {
 877                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
 878
 879                 filename = &pFindData->FileName[0];
 880                 if (unicode) {
 881                         len = cifs_unicode_bytelen(filename);
 882                 } else {
 883                         /* BB should we make this strnlen of PATH_MAX? */
 884                         len = strnlen(filename, PATH_MAX);
 885                 }
 886
 887                 *pinum = le64_to_cpu(pFindData->UniqueId);
 888         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
 889                 FILE_DIRECTORY_INFO *pFindData =
 890                         (FILE_DIRECTORY_INFO *)current_entry;
 891                 filename = &pFindData->FileName[0];
 892                 len = le32_to_cpu(pFindData->FileNameLength);
 893         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 894                 FILE_FULL_DIRECTORY_INFO *pFindData =
 895                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 896                 filename = &pFindData->FileName[0];
 897                 len = le32_to_cpu(pFindData->FileNameLength);
 898         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 899                 SEARCH_ID_FULL_DIR_INFO *pFindData =
 900                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 901                 filename = &pFindData->FileName[0];
 902                 len = le32_to_cpu(pFindData->FileNameLength);
 903                 *pinum = le64_to_cpu(pFindData->UniqueId);
 904         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 905                 FILE_BOTH_DIRECTORY_INFO *pFindData =
 906                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 907                 filename = &pFindData->FileName[0];
 908                 len = le32_to_cpu(pFindData->FileNameLength);
 909         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
 910                 FIND_FILE_STANDARD_INFO *pFindData =
 911                         (FIND_FILE_STANDARD_INFO *)current_entry;
 912                 filename = &pFindData->FileName[0];
 913                 /* one byte length, no name conversion */
 914                 len = (unsigned int)pFindData->FileNameLength;
 915         } else {
 916                 cFYI(1, ("Unknown findfirst level %d", level));
 917                 return -EINVAL;
 918         }
 919
 920         if (len > max_len) {
 921                 cERROR(1, ("bad search response length %d past smb end", len));
 922                 return -EINVAL;
 923         }
 924
 925         if (unicode) {
 926                 pqst->len = cifs_from_ucs2((char *) pqst->name,
 927                                            (__le16 *) filename,
 928                                            UNICODE_NAME_MAX,
 929                                            min(len, max_len), nlt,
 930                                            cifs_sb->mnt_cifs_flags &
 931                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 932         } else {
 933                 pqst->name = filename;
 934                 pqst->len = len;
 935         }
 936         pqst->hash = full_name_hash(pqst->name, pqst->len);
 937 /*      cFYI(1, ("filldir on %s",pqst->name));  */
 938         return rc;
 939 }
 940
 941 static int cifs_filldir(char *pfindEntry, struct file *file, filldir_t filldir,
 942                         void *direntry, char *scratch_buf, unsigned int max_len)
 943 {
 944         int rc = 0;
 945         struct qstr qstring;
 946         struct cifsFileInfo *pCifsF;
 947         unsigned int obj_type;
 948         __u64  inum;
 949         struct cifs_sb_info *cifs_sb;
 950         struct inode *tmp_inode;
 951         struct dentry *tmp_dentry;
 952
 953         /* get filename and len into qstring */
 954         /* get dentry */
 955         /* decide whether to create and populate ionde */
 956         if ((direntry == NULL) || (file == NULL))
 957                 return -EINVAL;
 958
 959         pCifsF = file->private_data;
 960
 961         if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 962                 return -ENOENT;
 963
 964         rc = cifs_entry_is_dot(pfindEntry, pCifsF);
 965         /* skip . and .. since we added them first */
 966         if (rc != 0)
 967                 return 0;
 968
 969         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 970
 971         qstring.name = scratch_buf;
 972         rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
 973                         pCifsF->srch_inf.info_level,
 974                         pCifsF->srch_inf.unicode, cifs_sb,
 975                         max_len,
 976                         &inum /* returned */);
 977
 978         if (rc)
 979                 return rc;
 980
 981         /* only these two infolevels return valid inode numbers */
 982         if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX ||
 983             pCifsF->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO)
 984                 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
 985                                         &inum);
 986         else
 987                 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
 988                                         NULL);
 989
 990         if ((tmp_inode == NULL) || (tmp_dentry == NULL))
 991                 return -ENOMEM;
 992
 993         /* we pass in rc below, indicating whether it is a new inode,
 994            so we can figure out whether to invalidate the inode cached
 995            data if the file has changed */
 996         if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
 997                 unix_fill_in_inode(tmp_inode,
 998                                    (FILE_UNIX_INFO *)pfindEntry,
 999                                    &obj_type, rc);
1000         else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
1001                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
1002                                 pfindEntry, &obj_type, rc);
1003         else
1004                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
1005
1006         if (rc) /* new inode - needs to be tied to dentry */ {
1007                 d_instantiate(tmp_dentry, tmp_inode);
1008                 if (rc == 2)
1009                         d_rehash(tmp_dentry);
1010         }
1011
1012
1013         rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
1014                      tmp_inode->i_ino, obj_type);
1015         if (rc) {
1016                 cFYI(1, ("filldir rc = %d", rc));
1017                 /* we can not return filldir errors to the caller
1018                 since they are "normal" when the stat blocksize
1019                 is too small - we return remapped error instead */
1020                 rc = -EOVERFLOW;
1021         }
1022
1023         dput(tmp_dentry);
1024         return rc;
1025 }
1026
1027
1028 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
1029 {
1030         int rc = 0;
1031         int xid, i;
1032         struct cifs_sb_info *cifs_sb;
1033         struct cifsTconInfo *pTcon;
1034         struct cifsFileInfo *cifsFile = NULL;
1035         char *current_entry;
1036         int num_to_fill = 0;
1037         char *tmp_buf = NULL;
1038         char *end_of_smb;
1039         unsigned int max_len;
1040
1041         xid = GetXid();
1042
1043         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1044         pTcon = cifs_sb->tcon;
1045         if (pTcon == NULL)
1046                 return -EINVAL;
1047
1048         switch ((int) file->f_pos) {
1049         case 0:
1050                 if (filldir(direntry, ".", 1, file->f_pos,
1051                      file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1052                         cERROR(1, ("Filldir for current dir failed"));
1053                         rc = -ENOMEM;
1054                         break;
1055                 }
1056                 file->f_pos++;
1057         case 1:
1058                 if (filldir(direntry, "..", 2, file->f_pos,
1059                      file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1060                         cERROR(1, ("Filldir for parent dir failed"));
1061                         rc = -ENOMEM;
1062                         break;
1063                 }
1064                 file->f_pos++;
1065         default:
1066                 /* 1) If search is active,
1067                         is in current search buffer?
1068                         if it before then restart search
1069                         if after then keep searching till find it */
1070
1071                 if (file->private_data == NULL) {
1072                         rc = initiate_cifs_search(xid, file);
1073                         cFYI(1, ("initiate cifs search rc %d", rc));
1074                         if (rc) {
1075                                 FreeXid(xid);
1076                                 return rc;
1077                         }
1078                 }
1079                 if (file->private_data == NULL) {
1080                         rc = -EINVAL;
1081                         FreeXid(xid);
1082                         return rc;
1083                 }
1084                 cifsFile = file->private_data;
1085                 if (cifsFile->srch_inf.endOfSearch) {
1086                         if (cifsFile->srch_inf.emptyDir) {
1087                                 cFYI(1, ("End of search, empty dir"));
1088                                 rc = 0;
1089                                 break;
1090                         }
1091                 } /* else {
1092                         cifsFile->invalidHandle = true;
1093                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1094                 } */
1095
1096                 rc = find_cifs_entry(xid, pTcon, file,
1097                                 &current_entry, &num_to_fill);
1098                 if (rc) {
1099                         cFYI(1, ("fce error %d", rc));
1100                         goto rddir2_exit;
1101                 } else if (current_entry != NULL) {
1102                         cFYI(1, ("entry %lld found", file->f_pos));
1103                 } else {
1104                         cFYI(1, ("could not find entry"));
1105                         goto rddir2_exit;
1106                 }
1107                 cFYI(1, ("loop through %d times filling dir for net buf %p",
1108                         num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1109                 max_len = smbCalcSize((struct smb_hdr *)
1110                                 cifsFile->srch_inf.ntwrk_buf_start);
1111                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1112
1113                 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
1114                 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1115                         if (current_entry == NULL) {
1116                                 /* evaluate whether this case is an error */
1117                                 cERROR(1, ("past SMB end,  num to fill %d i %d",
1118                                           num_to_fill, i));
1119                                 break;
1120                         }
1121                         /* if buggy server returns . and .. late do
1122                         we want to check for that here? */
1123                         rc = cifs_filldir(current_entry, file,
1124                                         filldir, direntry, tmp_buf, max_len);
1125                         if (rc == -EOVERFLOW) {
1126                                 rc = 0;
1127                                 break;
1128                         }
1129
1130                         file->f_pos++;
1131                         if (file->f_pos ==
1132                                 cifsFile->srch_inf.index_of_last_entry) {
1133                                 cFYI(1, ("last entry in buf at pos %lld %s",
1134                                         file->f_pos, tmp_buf));
1135                                 cifs_save_resume_key(current_entry, cifsFile);
1136                                 break;
1137                         } else
1138                                 current_entry =
1139                                         nxt_dir_entry(current_entry, end_of_smb,
1140                                                 cifsFile->srch_inf.info_level);
1141                 }
1142                 kfree(tmp_buf);
1143                 break;
1144         } /* end switch */
1145
1146 rddir2_exit:
1147         FreeXid(xid);
1148         return rc;
1149 }