git.oblomov.eu Git - linux-2.6/blob - fs/cifs/readdir.c

   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004, 2005
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <linux/fs.h>
  24 #include <linux/stat.h>
  25 #include <linux/smp_lock.h>
  26 #include "cifspdu.h"
  27 #include "cifsglob.h"
  28 #include "cifsproto.h"
  29 #include "cifs_unicode.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_fs_sb.h"
  32 #include "cifsfs.h"
  33
  34 /* BB fixme - add debug wrappers around this function to disable it fixme BB */
  35 /* static void dump_cifs_file_struct(struct file *file, char *label)
  36 {
  37         struct cifsFileInfo * cf;
  38
  39         if(file) {
  40                 cf = file->private_data;
  41                 if(cf == NULL) {
  42                         cFYI(1,("empty cifs private file data"));
  43                         return;
  44                 }
  45                 if(cf->invalidHandle) {
  46                         cFYI(1,("invalid handle"));
  47                 }
  48                 if(cf->srch_inf.endOfSearch) {
  49                         cFYI(1,("end of search"));
  50                 }
  51                 if(cf->srch_inf.emptyDir) {
  52                         cFYI(1,("empty dir"));
  53                 }
  54
  55         }
  56 } */
  57
  58 /* Returns one if new inode created (which therefore needs to be hashed) */
  59 /* Might check in the future if inode number changed so we can rehash inode */
  60 static int construct_dentry(struct qstr *qstring, struct file *file,
  61         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  62 {
  63         struct dentry *tmp_dentry;
  64         struct cifs_sb_info *cifs_sb;
  65         struct cifsTconInfo *pTcon;
  66         int rc = 0;
  67
  68         cFYI(1, ("For %s", qstring->name));
  69         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
  70         pTcon = cifs_sb->tcon;
  71
  72         qstring->hash = full_name_hash(qstring->name, qstring->len);
  73         tmp_dentry = d_lookup(file->f_dentry, qstring);
  74         if (tmp_dentry) {
  75                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
  76                 *ptmp_inode = tmp_dentry->d_inode;
  77 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
  78                 if(*ptmp_inode == NULL) {
  79                         *ptmp_inode = new_inode(file->f_dentry->d_sb);
  80                         if(*ptmp_inode == NULL)
  81                                 return rc;
  82                         rc = 1;
  83                         d_instantiate(tmp_dentry, *ptmp_inode);
  84                 }
  85         } else {
  86                 tmp_dentry = d_alloc(file->f_dentry, qstring);
  87                 if(tmp_dentry == NULL) {
  88                         cERROR(1,("Failed allocating dentry"));
  89                         *ptmp_inode = NULL;
  90                         return rc;
  91                 }
  92
  93                 *ptmp_inode = new_inode(file->f_dentry->d_sb);
  94                 tmp_dentry->d_op = &cifs_dentry_ops;
  95                 if(*ptmp_inode == NULL)
  96                         return rc;
  97                 rc = 1;
  98                 d_instantiate(tmp_dentry, *ptmp_inode);
  99                 d_rehash(tmp_dentry);
 100         }
 101
 102         tmp_dentry->d_time = jiffies;
 103         *pnew_dentry = tmp_dentry;
 104         return rc;
 105 }
 106
 107 static void fill_in_inode(struct inode *tmp_inode,
 108         FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
 109 {
 110         loff_t local_size;
 111         struct timespec local_mtime;
 112
 113         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 114         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 115         __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 116         __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 117         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 118
 119         cifsInfo->cifsAttrs = attr;
 120         cifsInfo->time = jiffies;
 121
 122         /* save mtime and size */
 123         local_mtime = tmp_inode->i_mtime;
 124         local_size  = tmp_inode->i_size;
 125
 126         /* Linux can not store file creation time unfortunately so ignore it */
 127         tmp_inode->i_atime =
 128             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 129         tmp_inode->i_mtime =
 130             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 131         tmp_inode->i_ctime =
 132             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 133         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 134         /* 2767 perms - indicate mandatory locking */
 135                 /* BB fill in uid and gid here? with help from winbind?
 136                    or retrieve from NTFS stream extended attribute */
 137         if (atomic_read(&cifsInfo->inUse) == 0) {
 138                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 139                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 140                 /* set default mode. will override for dirs below */
 141                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 142         }
 143
 144         if (attr & ATTR_DIRECTORY) {
 145                 *pobject_type = DT_DIR;
 146                 /* override default perms since we do not lock dirs */
 147                 if(atomic_read(&cifsInfo->inUse) == 0) {
 148                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 149                 }
 150                 tmp_inode->i_mode |= S_IFDIR;
 151 /* we no longer mark these because we could not follow them */
 152 /*        } else if (attr & ATTR_REPARSE) {
 153                 *pobject_type = DT_LNK;
 154                 tmp_inode->i_mode |= S_IFLNK; */
 155         } else {
 156                 *pobject_type = DT_REG;
 157                 tmp_inode->i_mode |= S_IFREG;
 158                 if (attr & ATTR_READONLY)
 159                         tmp_inode->i_mode &= ~(S_IWUGO);
 160         } /* could add code here - to validate if device or weird share type? */
 161
 162         /* can not fill in nlink here as in qpathinfo version and Unx search */
 163         if (atomic_read(&cifsInfo->inUse) == 0) {
 164                 atomic_set(&cifsInfo->inUse, 1);
 165         }
 166
 167         if (is_size_safe_to_change(cifsInfo)) {
 168                 /* can not safely change the file size here if the
 169                 client is writing to it due to potential races */
 170                 i_size_write(tmp_inode, end_of_file);
 171
 172         /* 512 bytes (2**9) is the fake blocksize that must be used */
 173         /* for this calculation, even though the reported blocksize is larger */
 174                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 175         }
 176
 177         if (allocation_size < end_of_file)
 178                 cFYI(1, ("May be sparse file, allocation less than file size"));
 179         cFYI(1,
 180              ("File Size %ld and blocks %ld and blocksize %ld",
 181               (unsigned long)tmp_inode->i_size, tmp_inode->i_blocks,
 182               tmp_inode->i_blksize));
 183         if (S_ISREG(tmp_inode->i_mode)) {
 184                 cFYI(1, ("File inode"));
 185                 tmp_inode->i_op = &cifs_file_inode_ops;
 186                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 187                         tmp_inode->i_fop = &cifs_file_direct_ops;
 188                 else
 189                         tmp_inode->i_fop = &cifs_file_ops;
 190                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 191
 192                 if(isNewInode)
 193                         return; /* No sense invalidating pages for new inode
 194                                    since have not started caching readahead file
 195                                    data yet */
 196
 197                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 198                         (local_size == tmp_inode->i_size)) {
 199                         cFYI(1, ("inode exists but unchanged"));
 200                 } else {
 201                         /* file may have changed on server */
 202                         cFYI(1, ("invalidate inode, readdir detected change"));
 203                         invalidate_remote_inode(tmp_inode);
 204                 }
 205         } else if (S_ISDIR(tmp_inode->i_mode)) {
 206                 cFYI(1, ("Directory inode"));
 207                 tmp_inode->i_op = &cifs_dir_inode_ops;
 208                 tmp_inode->i_fop = &cifs_dir_ops;
 209         } else if (S_ISLNK(tmp_inode->i_mode)) {
 210                 cFYI(1, ("Symbolic Link inode"));
 211                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 212         } else {
 213                 cFYI(1, ("Init special inode"));
 214                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 215                                    tmp_inode->i_rdev);
 216         }
 217 }
 218
 219 static void unix_fill_in_inode(struct inode *tmp_inode,
 220         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 221 {
 222         loff_t local_size;
 223         struct timespec local_mtime;
 224
 225         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 226         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 227
 228         __u32 type = le32_to_cpu(pfindData->Type);
 229         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 230         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 231         cifsInfo->time = jiffies;
 232         atomic_inc(&cifsInfo->inUse);
 233
 234         /* save mtime and size */
 235         local_mtime = tmp_inode->i_mtime;
 236         local_size  = tmp_inode->i_size;
 237
 238         tmp_inode->i_atime =
 239             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 240         tmp_inode->i_mtime =
 241             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 242         tmp_inode->i_ctime =
 243             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 244
 245         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 246         if (type == UNIX_FILE) {
 247                 *pobject_type = DT_REG;
 248                 tmp_inode->i_mode |= S_IFREG;
 249         } else if (type == UNIX_SYMLINK) {
 250                 *pobject_type = DT_LNK;
 251                 tmp_inode->i_mode |= S_IFLNK;
 252         } else if (type == UNIX_DIR) {
 253                 *pobject_type = DT_DIR;
 254                 tmp_inode->i_mode |= S_IFDIR;
 255         } else if (type == UNIX_CHARDEV) {
 256                 *pobject_type = DT_CHR;
 257                 tmp_inode->i_mode |= S_IFCHR;
 258                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 259                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 260         } else if (type == UNIX_BLOCKDEV) {
 261                 *pobject_type = DT_BLK;
 262                 tmp_inode->i_mode |= S_IFBLK;
 263                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 264                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 265         } else if (type == UNIX_FIFO) {
 266                 *pobject_type = DT_FIFO;
 267                 tmp_inode->i_mode |= S_IFIFO;
 268         } else if (type == UNIX_SOCKET) {
 269                 *pobject_type = DT_SOCK;
 270                 tmp_inode->i_mode |= S_IFSOCK;
 271         }
 272
 273         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 274         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 275         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 276
 277         if (is_size_safe_to_change(cifsInfo)) {
 278                 /* can not safely change the file size here if the
 279                 client is writing to it due to potential races */
 280                 i_size_write(tmp_inode,end_of_file);
 281
 282         /* 512 bytes (2**9) is the fake blocksize that must be used */
 283         /* for this calculation, not the real blocksize */
 284                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 285         }
 286
 287         if (S_ISREG(tmp_inode->i_mode)) {
 288                 cFYI(1, ("File inode"));
 289                 tmp_inode->i_op = &cifs_file_inode_ops;
 290                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 291                         tmp_inode->i_fop = &cifs_file_direct_ops;
 292                 else
 293                         tmp_inode->i_fop = &cifs_file_ops;
 294                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 295
 296                 if(isNewInode)
 297                         return; /* No sense invalidating pages for new inode since we
 298                                            have not started caching readahead file data yet */
 299
 300                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 301                         (local_size == tmp_inode->i_size)) {
 302                         cFYI(1, ("inode exists but unchanged"));
 303                 } else {
 304                         /* file may have changed on server */
 305                         cFYI(1, ("invalidate inode, readdir detected change"));
 306                         invalidate_remote_inode(tmp_inode);
 307                 }
 308         } else if (S_ISDIR(tmp_inode->i_mode)) {
 309                 cFYI(1, ("Directory inode"));
 310                 tmp_inode->i_op = &cifs_dir_inode_ops;
 311                 tmp_inode->i_fop = &cifs_dir_ops;
 312         } else if (S_ISLNK(tmp_inode->i_mode)) {
 313                 cFYI(1, ("Symbolic Link inode"));
 314                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 315 /* tmp_inode->i_fop = *//* do not need to set to anything */
 316         } else {
 317                 cFYI(1, ("Special inode"));
 318                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 319                                    tmp_inode->i_rdev);
 320         }
 321 }
 322
 323 static int initiate_cifs_search(const int xid, struct file *file)
 324 {
 325         int rc = 0;
 326         char * full_path;
 327         struct cifsFileInfo * cifsFile;
 328         struct cifs_sb_info *cifs_sb;
 329         struct cifsTconInfo *pTcon;
 330
 331         if(file->private_data == NULL) {
 332                 file->private_data =
 333                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 334         }
 335
 336         if(file->private_data == NULL) {
 337                 return -ENOMEM;
 338         } else {
 339                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 340         }
 341         cifsFile = file->private_data;
 342         cifsFile->invalidHandle = TRUE;
 343         cifsFile->srch_inf.endOfSearch = FALSE;
 344
 345         if(file->f_dentry == NULL)
 346                 return -ENOENT;
 347
 348         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 349         if(cifs_sb == NULL)
 350                 return -EINVAL;
 351
 352         pTcon = cifs_sb->tcon;
 353         if(pTcon == NULL)
 354                 return -EINVAL;
 355
 356         down(&file->f_dentry->d_sb->s_vfs_rename_sem);
 357         full_path = build_path_from_dentry(file->f_dentry, cifs_sb);
 358         up(&file->f_dentry->d_sb->s_vfs_rename_sem);
 359
 360         if(full_path == NULL) {
 361                 return -ENOMEM;
 362         }
 363
 364         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 365
 366 ffirst_retry:
 367         /* test for Unix extensions */
 368         if (pTcon->ses->capabilities & CAP_UNIX) {
 369                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 370         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 371                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 372         } else /* not srvinos - BB fixme add check for backlevel? */ {
 373                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 374         }
 375
 376         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 377                 &cifsFile->netfid, &cifsFile->srch_inf,
 378                 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 379         if(rc == 0)
 380                 cifsFile->invalidHandle = FALSE;
 381         if((rc == -EOPNOTSUPP) &&
 382                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 383                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 384                 goto ffirst_retry;
 385         }
 386         kfree(full_path);
 387         return rc;
 388 }
 389
 390 /* return length of unicode string in bytes */
 391 static int cifs_unicode_bytelen(char *str)
 392 {
 393         int len;
 394         __le16 * ustr = (__le16 *)str;
 395
 396         for(len=0;len <= PATH_MAX;len++) {
 397                 if(ustr[len] == 0)
 398                         return len << 1;
 399         }
 400         cFYI(1,("Unicode string longer than PATH_MAX found"));
 401         return len << 1;
 402 }
 403
 404 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
 405 {
 406         char * new_entry;
 407         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 408
 409         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 410         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 411         /* validate that new_entry is not past end of SMB */
 412         if(new_entry >= end_of_smb) {
 413                 cERROR(1,
 414                       ("search entry %p began after end of SMB %p old entry %p",
 415                         new_entry, end_of_smb, old_entry));
 416                 return NULL;
 417         } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
 418                 cERROR(1,("search entry %p extends after end of SMB %p",
 419                         new_entry, end_of_smb));
 420                 return NULL;
 421         } else
 422                 return new_entry;
 423
 424 }
 425
 426 #define UNICODE_DOT cpu_to_le16(0x2e)
 427
 428 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 429 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 430 {
 431         int rc = 0;
 432         char * filename = NULL;
 433         int len = 0;
 434
 435         if(cfile->srch_inf.info_level == 0x202) {
 436                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 437                 filename = &pFindData->FileName[0];
 438                 if(cfile->srch_inf.unicode) {
 439                         len = cifs_unicode_bytelen(filename);
 440                 } else {
 441                         /* BB should we make this strnlen of PATH_MAX? */
 442                         len = strnlen(filename, 5);
 443                 }
 444         } else if(cfile->srch_inf.info_level == 0x101) {
 445                 FILE_DIRECTORY_INFO * pFindData =
 446                         (FILE_DIRECTORY_INFO *)current_entry;
 447                 filename = &pFindData->FileName[0];
 448                 len = le32_to_cpu(pFindData->FileNameLength);
 449         } else if(cfile->srch_inf.info_level == 0x102) {
 450                 FILE_FULL_DIRECTORY_INFO * pFindData =
 451                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 452                 filename = &pFindData->FileName[0];
 453                 len = le32_to_cpu(pFindData->FileNameLength);
 454         } else if(cfile->srch_inf.info_level == 0x105) {
 455                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 456                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 457                 filename = &pFindData->FileName[0];
 458                 len = le32_to_cpu(pFindData->FileNameLength);
 459         } else if(cfile->srch_inf.info_level == 0x104) {
 460                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 461                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 462                 filename = &pFindData->FileName[0];
 463                 len = le32_to_cpu(pFindData->FileNameLength);
 464         } else {
 465                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 466         }
 467
 468         if(filename) {
 469                 if(cfile->srch_inf.unicode) {
 470                         __le16 *ufilename = (__le16 *)filename;
 471                         if(len == 2) {
 472                                 /* check for . */
 473                                 if(ufilename[0] == UNICODE_DOT)
 474                                         rc = 1;
 475                         } else if(len == 4) {
 476                                 /* check for .. */
 477                                 if((ufilename[0] == UNICODE_DOT)
 478                                    &&(ufilename[1] == UNICODE_DOT))
 479                                         rc = 2;
 480                         }
 481                 } else /* ASCII */ {
 482                         if(len == 1) {
 483                                 if(filename[0] == '.')
 484                                         rc = 1;
 485                         } else if(len == 2) {
 486                                 if((filename[0] == '.') && (filename[1] == '.'))
 487                                         rc = 2;
 488                         }
 489                 }
 490         }
 491
 492         return rc;
 493 }
 494
 495 /* find the corresponding entry in the search */
 496 /* Note that the SMB server returns search entries for . and .. which
 497    complicates logic here if we choose to parse for them and we do not
 498    assume that they are located in the findfirst return buffer.*/
 499 /* We start counting in the buffer with entry 2 and increment for every
 500    entry (do not increment for . or .. entry) */
 501 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 502         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 503 {
 504         int rc = 0;
 505         int pos_in_buf = 0;
 506         loff_t first_entry_in_buffer;
 507         loff_t index_to_find = file->f_pos;
 508         struct cifsFileInfo * cifsFile = file->private_data;
 509         /* check if index in the buffer */
 510
 511         if((cifsFile == NULL) || (ppCurrentEntry == NULL) || (num_to_ret == NULL))
 512                 return -ENOENT;
 513
 514         *ppCurrentEntry = NULL;
 515         first_entry_in_buffer =
 516                 cifsFile->srch_inf.index_of_last_entry -
 517                         cifsFile->srch_inf.entries_in_buffer;
 518 /*      dump_cifs_file_struct(file, "In fce ");*/
 519         if(index_to_find < first_entry_in_buffer) {
 520                 /* close and restart search */
 521                 cFYI(1,("search backing up - close and restart search"));
 522                 cifsFile->invalidHandle = TRUE;
 523                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 524                 kfree(cifsFile->search_resume_name);
 525                 cifsFile->search_resume_name = NULL;
 526                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 527                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 528                         cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
 529                 }
 530                 rc = initiate_cifs_search(xid,file);
 531                 if(rc) {
 532                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 533                         return rc;
 534                 }
 535         }
 536
 537         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 538               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 539                 cFYI(1,("calling findnext2"));
 540                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 541                                   &cifsFile->srch_inf);
 542                 if(rc)
 543                         return -ENOENT;
 544         }
 545         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 546                 /* we found the buffer that contains the entry */
 547                 /* scan and find it */
 548                 int i;
 549                 char * current_entry;
 550                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 551                         smbCalcSize((struct smb_hdr *)
 552                                 cifsFile->srch_inf.ntwrk_buf_start);
 553 /*      dump_cifs_file_struct(file,"found entry in fce "); */
 554                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 555                                         - cifsFile->srch_inf.entries_in_buffer;
 556                 pos_in_buf = index_to_find - first_entry_in_buffer;
 557                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 558                 current_entry = cifsFile->srch_inf.srch_entries_start;
 559                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 560                         /* go entry by entry figuring out which is first */
 561                         /* if( . or ..)
 562                                 skip */
 563                         rc = cifs_entry_is_dot(current_entry,cifsFile);
 564                         if(rc == 1) /* is . or .. so skip */ {
 565                                 cFYI(1,("Entry is .")); /* BB removeme BB */
 566                                 /* continue; */
 567                         } else if (rc == 2 ) {
 568                                 cFYI(1,("Entry is ..")); /* BB removeme BB */
 569                                 /* continue; */
 570                         }
 571                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
 572                 }
 573                 if((current_entry == NULL) && (i < pos_in_buf)) {
 574                         /* BB fixme - check if we should flag this error */
 575                         cERROR(1,("reached end of buf searching for pos in buf"
 576                           " %d index to find %lld rc %d",
 577                           pos_in_buf,index_to_find,rc));
 578                 }
 579                 rc = 0;
 580                 *ppCurrentEntry = current_entry;
 581         } else {
 582                 cFYI(1,("index not in buffer - could not findnext into it"));
 583                 return 0;
 584         }
 585
 586         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 587                 cFYI(1,("can not return entries when pos_in_buf beyond last entry"));
 588                 *num_to_ret = 0;
 589         } else
 590                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 591 /*      dump_cifs_file_struct(file, "end fce ");*/
 592
 593         return rc;
 594 }
 595
 596 /* inode num, inode type and filename returned */
 597 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 598         char *current_entry, __u16 level, unsigned int unicode,
 599         struct cifs_sb_info * cifs_sb, ino_t *pinum)
 600 {
 601         int rc = 0;
 602         unsigned int len = 0;
 603         char * filename;
 604         struct nls_table * nlt = cifs_sb->local_nls;
 605
 606         *pinum = 0;
 607
 608         if(level == SMB_FIND_FILE_UNIX) {
 609                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 610
 611                 filename = &pFindData->FileName[0];
 612                 if(unicode) {
 613                         len = cifs_unicode_bytelen(filename);
 614                 } else {
 615                         /* BB should we make this strnlen of PATH_MAX? */
 616                         len = strnlen(filename, PATH_MAX);
 617                 }
 618
 619                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 620                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 621                         *pinum = pFindData->UniqueId;
 622         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 623                 FILE_DIRECTORY_INFO * pFindData =
 624                         (FILE_DIRECTORY_INFO *)current_entry;
 625                 filename = &pFindData->FileName[0];
 626                 len = le32_to_cpu(pFindData->FileNameLength);
 627         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 628                 FILE_FULL_DIRECTORY_INFO * pFindData =
 629                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 630                 filename = &pFindData->FileName[0];
 631                 len = le32_to_cpu(pFindData->FileNameLength);
 632         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 633                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 634                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 635                 filename = &pFindData->FileName[0];
 636                 len = le32_to_cpu(pFindData->FileNameLength);
 637                 *pinum = pFindData->UniqueId;
 638         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 639                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 640                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 641                 filename = &pFindData->FileName[0];
 642                 len = le32_to_cpu(pFindData->FileNameLength);
 643         } else {
 644                 cFYI(1,("Unknown findfirst level %d",level));
 645                 return -EINVAL;
 646         }
 647         if(unicode) {
 648                 /* BB fixme - test with long names */
 649                 /* Note converted filename can be longer than in unicode */
 650                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 651                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 652                                         (__le16 *)filename, len/2, nlt);
 653                 else
 654                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 655                                         (wchar_t *)filename,len/2,nlt);
 656         } else {
 657                 pqst->name = filename;
 658                 pqst->len = len;
 659         }
 660         pqst->hash = full_name_hash(pqst->name,pqst->len);
 661 /*      cFYI(1,("filldir on %s",pqst->name));  */
 662         return rc;
 663 }
 664
 665 static int cifs_filldir(char *pfindEntry, struct file *file,
 666         filldir_t filldir, void *direntry, char *scratch_buf)
 667 {
 668         int rc = 0;
 669         struct qstr qstring;
 670         struct cifsFileInfo * pCifsF;
 671         unsigned obj_type;
 672         ino_t  inum;
 673         struct cifs_sb_info * cifs_sb;
 674         struct inode *tmp_inode;
 675         struct dentry *tmp_dentry;
 676
 677         /* get filename and len into qstring */
 678         /* get dentry */
 679         /* decide whether to create and populate ionde */
 680         if((direntry == NULL) || (file == NULL))
 681                 return -EINVAL;
 682
 683         pCifsF = file->private_data;
 684
 685         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 686                 return -ENOENT;
 687
 688         if(file->f_dentry == NULL)
 689                 return -ENOENT;
 690
 691         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 692
 693         qstring.name = scratch_buf;
 694         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 695                         pCifsF->srch_inf.info_level,
 696                         pCifsF->srch_inf.unicode,cifs_sb,
 697                         &inum /* returned */);
 698
 699         if(rc)
 700                 return rc;
 701
 702         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 703         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 704                 return -ENOMEM;
 705
 706         if(rc) {
 707                 /* inode created, we need to hash it with right inode number */
 708                 if(inum != 0) {
 709                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 710                         tmp_inode->i_ino = inum;
 711                 }
 712                 insert_inode_hash(tmp_inode);
 713         }
 714
 715         /* we pass in rc below, indicating whether it is a new inode,
 716            so we can figure out whether to invalidate the inode cached
 717            data if the file has changed */
 718         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 719                 unix_fill_in_inode(tmp_inode,
 720                                    (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
 721         } else {
 722                 fill_in_inode(tmp_inode,
 723                               (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
 724         }
 725
 726         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 727                      tmp_inode->i_ino,obj_type);
 728         if(rc) {
 729                 cFYI(1,("filldir rc = %d",rc));
 730         }
 731
 732         dput(tmp_dentry);
 733         return rc;
 734 }
 735
 736 static int cifs_save_resume_key(const char *current_entry,
 737         struct cifsFileInfo *cifsFile)
 738 {
 739         int rc = 0;
 740         unsigned int len = 0;
 741         __u16 level;
 742         char * filename;
 743
 744         if((cifsFile == NULL) || (current_entry == NULL))
 745                 return -EINVAL;
 746
 747         level = cifsFile->srch_inf.info_level;
 748
 749         if(level == SMB_FIND_FILE_UNIX) {
 750                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 751
 752                 filename = &pFindData->FileName[0];
 753                 if(cifsFile->srch_inf.unicode) {
 754                         len = cifs_unicode_bytelen(filename);
 755                 } else {
 756                         /* BB should we make this strnlen of PATH_MAX? */
 757                         len = strnlen(filename, PATH_MAX);
 758                 }
 759                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 760         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 761                 FILE_DIRECTORY_INFO * pFindData =
 762                         (FILE_DIRECTORY_INFO *)current_entry;
 763                 filename = &pFindData->FileName[0];
 764                 len = le32_to_cpu(pFindData->FileNameLength);
 765                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 766         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 767                 FILE_FULL_DIRECTORY_INFO * pFindData =
 768                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 769                 filename = &pFindData->FileName[0];
 770                 len = le32_to_cpu(pFindData->FileNameLength);
 771                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 772         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 773                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 774                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 775                 filename = &pFindData->FileName[0];
 776                 len = le32_to_cpu(pFindData->FileNameLength);
 777                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 778         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 779                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 780                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 781                 filename = &pFindData->FileName[0];
 782                 len = le32_to_cpu(pFindData->FileNameLength);
 783                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 784         } else {
 785                 cFYI(1,("Unknown findfirst level %d",level));
 786                 return -EINVAL;
 787         }
 788         cifsFile->srch_inf.resume_name_len = len;
 789         cifsFile->srch_inf.presume_name = filename;
 790         return rc;
 791 }
 792
 793 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 794 {
 795         int rc = 0;
 796         int xid,i;
 797         struct cifs_sb_info *cifs_sb;
 798         struct cifsTconInfo *pTcon;
 799         struct cifsFileInfo *cifsFile = NULL;
 800         char * current_entry;
 801         int num_to_fill = 0;
 802         char * tmp_buf = NULL;
 803         char * end_of_smb;
 804
 805         xid = GetXid();
 806
 807         if(file->f_dentry == NULL) {
 808                 FreeXid(xid);
 809                 return -EIO;
 810         }
 811 /*      dump_cifs_file_struct(file, "Begin rdir "); */
 812
 813         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 814         pTcon = cifs_sb->tcon;
 815         if(pTcon == NULL)
 816                 return -EINVAL;
 817
 818 /*      cFYI(1,("readdir2 pos: %lld",file->f_pos)); */
 819
 820         switch ((int) file->f_pos) {
 821         case 0:
 822                 /*if (filldir(direntry, ".", 1, file->f_pos,
 823                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 824                         cERROR(1, ("Filldir for current dir failed "));
 825                         rc = -ENOMEM;
 826                         break;
 827                 }
 828                 file->f_pos++; */
 829         case 1:
 830                 /* if (filldir(direntry, "..", 2, file->f_pos,
 831                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 832                         cERROR(1, ("Filldir for parent dir failed "));
 833                         rc = -ENOMEM;
 834                         break;
 835                 }
 836                 file->f_pos++; */
 837         case 2:
 838                 /* 1) If search is active,
 839                         is in current search buffer?
 840                         if it before then restart search
 841                         if after then keep searching till find it */
 842
 843                 if(file->private_data == NULL) {
 844                         rc = initiate_cifs_search(xid,file);
 845                         cFYI(1,("initiate cifs search rc %d",rc));
 846                         if(rc) {
 847                                 FreeXid(xid);
 848                                 return rc;
 849                         }
 850                 }
 851         default:
 852                 if(file->private_data == NULL) {
 853                         rc = -EINVAL;
 854                         FreeXid(xid);
 855                         return rc;
 856                 }
 857                 cifsFile = file->private_data;
 858                 if (cifsFile->srch_inf.endOfSearch) {
 859                         if(cifsFile->srch_inf.emptyDir) {
 860                                 cFYI(1, ("End of search, empty dir"));
 861                                 rc = 0;
 862                                 break;
 863                         }
 864                 } /* else {
 865                         cifsFile->invalidHandle = TRUE;
 866                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 867                 }
 868                 kfree(cifsFile->search_resume_name);
 869                 cifsFile->search_resume_name = NULL; */
 870
 871                 /* BB account for . and .. in f_pos as special case */
 872                 /* dump_cifs_file_struct(file, "rdir after default ");*/
 873
 874                 rc = find_cifs_entry(xid,pTcon, file,
 875                                 &current_entry,&num_to_fill);
 876                 if(rc) {
 877                         cFYI(1,("fce error %d",rc));
 878                         goto rddir2_exit;
 879                 } else if (current_entry != NULL) {
 880                         cFYI(1,("entry %lld found",file->f_pos));
 881                 } else {
 882                         cFYI(1,("could not find entry"));
 883                         goto rddir2_exit;
 884                 }
 885                 cFYI(1,("loop through %d times filling dir for net buf %p",
 886                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
 887                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 888                         smbCalcSize((struct smb_hdr *)
 889                                     cifsFile->srch_inf.ntwrk_buf_start);
 890                 /* To be safe - for UCS to UTF-8 with strings loaded
 891                 with the rare long characters alloc more to account for
 892                 such multibyte target UTF-8 characters. cifs_unicode.c,
 893                 which actually does the conversion, has the same limit */
 894                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
 895                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
 896                         if(current_entry == NULL) {
 897                                 /* evaluate whether this case is an error */
 898                                 cERROR(1,("past end of SMB num to fill %d i %d",
 899                                           num_to_fill, i));
 900                                 break;
 901                         }
 902
 903                         rc = cifs_filldir(current_entry, file,
 904                                         filldir, direntry,tmp_buf);
 905                         file->f_pos++;
 906                         if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
 907                                 cFYI(1,("last entry in buf at pos %lld %s",
 908                                         file->f_pos,tmp_buf)); /* BB removeme BB */
 909                                 cifs_save_resume_key(current_entry,cifsFile);
 910                                 break;
 911                         } else
 912                                 current_entry = nxt_dir_entry(current_entry,
 913                                                               end_of_smb);
 914                 }
 915                 kfree(tmp_buf);
 916                 break;
 917         } /* end switch */
 918
 919 rddir2_exit:
 920         /* dump_cifs_file_struct(file, "end rdir ");  */
 921         FreeXid(xid);
 922         return rc;
 923 }