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   1 /*
   2  *   fs/cifs/file.c
   3  *
   4  *   vfs operations that deal with files
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2002,2003
   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/backing-dev.h>
  25 #include <linux/stat.h>
  26 #include <linux/fcntl.h>
  27 #include <linux/mpage.h>
  28 #include <linux/pagemap.h>
  29 #include <linux/pagevec.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/writeback.h>
  32 #include <asm/div64.h>
  33 #include "cifsfs.h"
  34 #include "cifspdu.h"
  35 #include "cifsglob.h"
  36 #include "cifsproto.h"
  37 #include "cifs_unicode.h"
  38 #include "cifs_debug.h"
  39 #include "cifs_fs_sb.h"
  40
  41 static inline struct cifsFileInfo *cifs_init_private(
  42         struct cifsFileInfo *private_data, struct inode *inode,
  43         struct file *file, __u16 netfid)
  44 {
  45         memset(private_data, 0, sizeof(struct cifsFileInfo));
  46         private_data->netfid = netfid;
  47         private_data->pid = current->tgid;
  48         init_MUTEX(&private_data->fh_sem);
  49         private_data->pfile = file; /* needed for writepage */
  50         private_data->pInode = inode;
  51         private_data->invalidHandle = FALSE;
  52         private_data->closePend = FALSE;
  53
  54         return private_data;
  55 }
  56
  57 static inline int cifs_convert_flags(unsigned int flags)
  58 {
  59         if ((flags & O_ACCMODE) == O_RDONLY)
  60                 return GENERIC_READ;
  61         else if ((flags & O_ACCMODE) == O_WRONLY)
  62                 return GENERIC_WRITE;
  63         else if ((flags & O_ACCMODE) == O_RDWR) {
  64                 /* GENERIC_ALL is too much permission to request
  65                    can cause unnecessary access denied on create */
  66                 /* return GENERIC_ALL; */
  67                 return (GENERIC_READ | GENERIC_WRITE);
  68         }
  69
  70         return 0x20197;
  71 }
  72
  73 static inline int cifs_get_disposition(unsigned int flags)
  74 {
  75         if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
  76                 return FILE_CREATE;
  77         else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
  78                 return FILE_OVERWRITE_IF;
  79         else if ((flags & O_CREAT) == O_CREAT)
  80                 return FILE_OPEN_IF;
  81         else
  82                 return FILE_OPEN;
  83 }
  84
  85 /* all arguments to this function must be checked for validity in caller */
  86 static inline int cifs_open_inode_helper(struct inode *inode, struct file *file,
  87         struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile,
  88         struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf,
  89         char *full_path, int xid)
  90 {
  91         struct timespec temp;
  92         int rc;
  93
  94         /* want handles we can use to read with first
  95            in the list so we do not have to walk the
  96            list to search for one in prepare_write */
  97         if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
  98                 list_add_tail(&pCifsFile->flist,
  99                               &pCifsInode->openFileList);
 100         } else {
 101                 list_add(&pCifsFile->flist,
 102                          &pCifsInode->openFileList);
 103         }
 104         write_unlock(&GlobalSMBSeslock);
 105         write_unlock(&file->f_owner.lock);
 106         if (pCifsInode->clientCanCacheRead) {
 107                 /* we have the inode open somewhere else
 108                    no need to discard cache data */
 109                 goto client_can_cache;
 110         }
 111
 112         /* BB need same check in cifs_create too? */
 113         /* if not oplocked, invalidate inode pages if mtime or file
 114            size changed */
 115         temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime));
 116         if (timespec_equal(&file->f_dentry->d_inode->i_mtime, &temp) &&
 117                            (file->f_dentry->d_inode->i_size ==
 118                             (loff_t)le64_to_cpu(buf->EndOfFile))) {
 119                 cFYI(1, ("inode unchanged on server"));
 120         } else {
 121                 if (file->f_dentry->d_inode->i_mapping) {
 122                 /* BB no need to lock inode until after invalidate
 123                    since namei code should already have it locked? */
 124                         filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
 125                         filemap_fdatawait(file->f_dentry->d_inode->i_mapping);
 126                 }
 127                 cFYI(1, ("invalidating remote inode since open detected it "
 128                          "changed"));
 129                 invalidate_remote_inode(file->f_dentry->d_inode);
 130         }
 131
 132 client_can_cache:
 133         if (pTcon->ses->capabilities & CAP_UNIX)
 134                 rc = cifs_get_inode_info_unix(&file->f_dentry->d_inode,
 135                         full_path, inode->i_sb, xid);
 136         else
 137                 rc = cifs_get_inode_info(&file->f_dentry->d_inode,
 138                         full_path, buf, inode->i_sb, xid);
 139
 140         if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) {
 141                 pCifsInode->clientCanCacheAll = TRUE;
 142                 pCifsInode->clientCanCacheRead = TRUE;
 143                 cFYI(1, ("Exclusive Oplock granted on inode %p",
 144                          file->f_dentry->d_inode));
 145         } else if ((*oplock & 0xF) == OPLOCK_READ)
 146                 pCifsInode->clientCanCacheRead = TRUE;
 147
 148         return rc;
 149 }
 150
 151 int cifs_open(struct inode *inode, struct file *file)
 152 {
 153         int rc = -EACCES;
 154         int xid, oplock;
 155         struct cifs_sb_info *cifs_sb;
 156         struct cifsTconInfo *pTcon;
 157         struct cifsFileInfo *pCifsFile;
 158         struct cifsInodeInfo *pCifsInode;
 159         struct list_head *tmp;
 160         char *full_path = NULL;
 161         int desiredAccess;
 162         int disposition;
 163         __u16 netfid;
 164         FILE_ALL_INFO *buf = NULL;
 165
 166         xid = GetXid();
 167
 168         cifs_sb = CIFS_SB(inode->i_sb);
 169         pTcon = cifs_sb->tcon;
 170
 171         if (file->f_flags & O_CREAT) {
 172                 /* search inode for this file and fill in file->private_data */
 173                 pCifsInode = CIFS_I(file->f_dentry->d_inode);
 174                 read_lock(&GlobalSMBSeslock);
 175                 list_for_each(tmp, &pCifsInode->openFileList) {
 176                         pCifsFile = list_entry(tmp, struct cifsFileInfo,
 177                                                flist);
 178                         if ((pCifsFile->pfile == NULL) &&
 179                             (pCifsFile->pid == current->tgid)) {
 180                                 /* mode set in cifs_create */
 181
 182                                 /* needed for writepage */
 183                                 pCifsFile->pfile = file;
 184
 185                                 file->private_data = pCifsFile;
 186                                 break;
 187                         }
 188                 }
 189                 read_unlock(&GlobalSMBSeslock);
 190                 if (file->private_data != NULL) {
 191                         rc = 0;
 192                         FreeXid(xid);
 193                         return rc;
 194                 } else {
 195                         if (file->f_flags & O_EXCL)
 196                                 cERROR(1, ("could not find file instance for "
 197                                            "new file %p ", file));
 198                 }
 199         }
 200
 201         down(&inode->i_sb->s_vfs_rename_sem);
 202         full_path = build_path_from_dentry(file->f_dentry);
 203         up(&inode->i_sb->s_vfs_rename_sem);
 204         if (full_path == NULL) {
 205                 FreeXid(xid);
 206                 return -ENOMEM;
 207         }
 208
 209         cFYI(1, (" inode = 0x%p file flags are 0x%x for %s",
 210                  inode, file->f_flags, full_path));
 211         desiredAccess = cifs_convert_flags(file->f_flags);
 212
 213 /*********************************************************************
 214  *  open flag mapping table:
 215  *
 216  *      POSIX Flag            CIFS Disposition
 217  *      ----------            ----------------
 218  *      O_CREAT               FILE_OPEN_IF
 219  *      O_CREAT | O_EXCL      FILE_CREATE
 220  *      O_CREAT | O_TRUNC     FILE_OVERWRITE_IF
 221  *      O_TRUNC               FILE_OVERWRITE
 222  *      none of the above     FILE_OPEN
 223  *
 224  *      Note that there is not a direct match between disposition
 225  *      FILE_SUPERSEDE (ie create whether or not file exists although
 226  *      O_CREAT | O_TRUNC is similar but truncates the existing
 227  *      file rather than creating a new file as FILE_SUPERSEDE does
 228  *      (which uses the attributes / metadata passed in on open call)
 229  *?
 230  *?  O_SYNC is a reasonable match to CIFS writethrough flag
 231  *?  and the read write flags match reasonably.  O_LARGEFILE
 232  *?  is irrelevant because largefile support is always used
 233  *?  by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
 234  *       O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
 235  *********************************************************************/
 236
 237         disposition = cifs_get_disposition(file->f_flags);
 238
 239         if (oplockEnabled)
 240                 oplock = REQ_OPLOCK;
 241         else
 242                 oplock = FALSE;
 243
 244         /* BB pass O_SYNC flag through on file attributes .. BB */
 245
 246         /* Also refresh inode by passing in file_info buf returned by SMBOpen
 247            and calling get_inode_info with returned buf (at least helps
 248            non-Unix server case) */
 249
 250         /* BB we can not do this if this is the second open of a file
 251            and the first handle has writebehind data, we might be
 252            able to simply do a filemap_fdatawrite/filemap_fdatawait first */
 253         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 254         if (!buf) {
 255                 rc = -ENOMEM;
 256                 goto out;
 257         }
 258         rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess,
 259                          CREATE_NOT_DIR, &netfid, &oplock, buf,
 260                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
 261                                  & CIFS_MOUNT_MAP_SPECIAL_CHR);
 262         if (rc == -EIO) {
 263                 /* Old server, try legacy style OpenX */
 264                 rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
 265                         desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
 266                         cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
 267                                 & CIFS_MOUNT_MAP_SPECIAL_CHR);
 268         }
 269         if (rc) {
 270                 cFYI(1, ("cifs_open returned 0x%x ", rc));
 271                 goto out;
 272         }
 273         file->private_data =
 274                 kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
 275         if (file->private_data == NULL) {
 276                 rc = -ENOMEM;
 277                 goto out;
 278         }
 279         pCifsFile = cifs_init_private(file->private_data, inode, file, netfid);
 280         write_lock(&file->f_owner.lock);
 281         write_lock(&GlobalSMBSeslock);
 282         list_add(&pCifsFile->tlist, &pTcon->openFileList);
 283
 284         pCifsInode = CIFS_I(file->f_dentry->d_inode);
 285         if (pCifsInode) {
 286                 rc = cifs_open_inode_helper(inode, file, pCifsInode,
 287                                             pCifsFile, pTcon,
 288                                             &oplock, buf, full_path, xid);
 289         } else {
 290                 write_unlock(&GlobalSMBSeslock);
 291                 write_unlock(&file->f_owner.lock);
 292         }
 293
 294         if (oplock & CIFS_CREATE_ACTION) {
 295                 /* time to set mode which we can not set earlier due to
 296                    problems creating new read-only files */
 297                 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
 298                         CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 299                                             inode->i_mode,
 300                                             (__u64)-1, (__u64)-1, 0 /* dev */,
 301                                             cifs_sb->local_nls,
 302                                             cifs_sb->mnt_cifs_flags &
 303                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 304                 } else {
 305                         /* BB implement via Windows security descriptors eg
 306                            CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
 307                                               -1, -1, local_nls);
 308                            in the meantime could set r/o dos attribute when
 309                            perms are eg: mode & 0222 == 0 */
 310                 }
 311         }
 312
 313 out:
 314         kfree(buf);
 315         kfree(full_path);
 316         FreeXid(xid);
 317         return rc;
 318 }
 319
 320 /* Try to reaquire byte range locks that were released when session */
 321 /* to server was lost */
 322 static int cifs_relock_file(struct cifsFileInfo *cifsFile)
 323 {
 324         int rc = 0;
 325
 326 /* BB list all locks open on this file and relock */
 327
 328         return rc;
 329 }
 330
 331 static int cifs_reopen_file(struct inode *inode, struct file *file,
 332         int can_flush)
 333 {
 334         int rc = -EACCES;
 335         int xid, oplock;
 336         struct cifs_sb_info *cifs_sb;
 337         struct cifsTconInfo *pTcon;
 338         struct cifsFileInfo *pCifsFile;
 339         struct cifsInodeInfo *pCifsInode;
 340         char *full_path = NULL;
 341         int desiredAccess;
 342         int disposition = FILE_OPEN;
 343         __u16 netfid;
 344
 345         if (inode == NULL)
 346                 return -EBADF;
 347         if (file->private_data) {
 348                 pCifsFile = (struct cifsFileInfo *)file->private_data;
 349         } else
 350                 return -EBADF;
 351
 352         xid = GetXid();
 353         down(&pCifsFile->fh_sem);
 354         if (pCifsFile->invalidHandle == FALSE) {
 355                 up(&pCifsFile->fh_sem);
 356                 FreeXid(xid);
 357                 return 0;
 358         }
 359
 360         if (file->f_dentry == NULL) {
 361                 up(&pCifsFile->fh_sem);
 362                 cFYI(1, ("failed file reopen, no valid name if dentry freed"));
 363                 FreeXid(xid);
 364                 return -EBADF;
 365         }
 366         cifs_sb = CIFS_SB(inode->i_sb);
 367         pTcon = cifs_sb->tcon;
 368 /* can not grab rename sem here because various ops, including
 369    those that already have the rename sem can end up causing writepage
 370    to get called and if the server was down that means we end up here,
 371    and we can never tell if the caller already has the rename_sem */
 372         full_path = build_path_from_dentry(file->f_dentry);
 373         if (full_path == NULL) {
 374                 up(&pCifsFile->fh_sem);
 375                 FreeXid(xid);
 376                 return -ENOMEM;
 377         }
 378
 379         cFYI(1, (" inode = 0x%p file flags are 0x%x for %s",
 380                  inode, file->f_flags,full_path));
 381         desiredAccess = cifs_convert_flags(file->f_flags);
 382
 383         if (oplockEnabled)
 384                 oplock = REQ_OPLOCK;
 385         else
 386                 oplock = FALSE;
 387
 388         /* Can not refresh inode by passing in file_info buf to be returned
 389            by SMBOpen and then calling get_inode_info with returned buf
 390            since file might have write behind data that needs to be flushed
 391            and server version of file size can be stale. If we knew for sure
 392            that inode was not dirty locally we could do this */
 393
 394 /*      buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 395         if (buf == 0) {
 396                 up(&pCifsFile->fh_sem);
 397                 kfree(full_path);
 398                 FreeXid(xid);
 399                 return -ENOMEM;
 400         } */
 401         rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess,
 402                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 403                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 404                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 405         if (rc) {
 406                 up(&pCifsFile->fh_sem);
 407                 cFYI(1, ("cifs_open returned 0x%x ", rc));
 408                 cFYI(1, ("oplock: %d ", oplock));
 409         } else {
 410                 pCifsFile->netfid = netfid;
 411                 pCifsFile->invalidHandle = FALSE;
 412                 up(&pCifsFile->fh_sem);
 413                 pCifsInode = CIFS_I(inode);
 414                 if (pCifsInode) {
 415                         if (can_flush) {
 416                                 filemap_fdatawrite(inode->i_mapping);
 417                                 filemap_fdatawait(inode->i_mapping);
 418                         /* temporarily disable caching while we
 419                            go to server to get inode info */
 420                                 pCifsInode->clientCanCacheAll = FALSE;
 421                                 pCifsInode->clientCanCacheRead = FALSE;
 422                                 if (pTcon->ses->capabilities & CAP_UNIX)
 423                                         rc = cifs_get_inode_info_unix(&inode,
 424                                                 full_path, inode->i_sb, xid);
 425                                 else
 426                                         rc = cifs_get_inode_info(&inode,
 427                                                 full_path, NULL, inode->i_sb,
 428                                                 xid);
 429                         } /* else we are writing out data to server already
 430                              and could deadlock if we tried to flush data, and
 431                              since we do not know if we have data that would
 432                              invalidate the current end of file on the server
 433                              we can not go to the server to get the new inod
 434                              info */
 435                         if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
 436                                 pCifsInode->clientCanCacheAll = TRUE;
 437                                 pCifsInode->clientCanCacheRead = TRUE;
 438                                 cFYI(1, ("Exclusive Oplock granted on inode %p",
 439                                          file->f_dentry->d_inode));
 440                         } else if ((oplock & 0xF) == OPLOCK_READ) {
 441                                 pCifsInode->clientCanCacheRead = TRUE;
 442                                 pCifsInode->clientCanCacheAll = FALSE;
 443                         } else {
 444                                 pCifsInode->clientCanCacheRead = FALSE;
 445                                 pCifsInode->clientCanCacheAll = FALSE;
 446                         }
 447                         cifs_relock_file(pCifsFile);
 448                 }
 449         }
 450
 451         kfree(full_path);
 452         FreeXid(xid);
 453         return rc;
 454 }
 455
 456 int cifs_close(struct inode *inode, struct file *file)
 457 {
 458         int rc = 0;
 459         int xid;
 460         struct cifs_sb_info *cifs_sb;
 461         struct cifsTconInfo *pTcon;
 462         struct cifsFileInfo *pSMBFile =
 463                 (struct cifsFileInfo *)file->private_data;
 464
 465         xid = GetXid();
 466
 467         cifs_sb = CIFS_SB(inode->i_sb);
 468         pTcon = cifs_sb->tcon;
 469         if (pSMBFile) {
 470                 pSMBFile->closePend = TRUE;
 471                 write_lock(&file->f_owner.lock);
 472                 if (pTcon) {
 473                         /* no sense reconnecting to close a file that is
 474                            already closed */
 475                         if (pTcon->tidStatus != CifsNeedReconnect) {
 476                                 write_unlock(&file->f_owner.lock);
 477                                 rc = CIFSSMBClose(xid, pTcon,
 478                                                   pSMBFile->netfid);
 479                                 write_lock(&file->f_owner.lock);
 480                         }
 481                 }
 482                 write_lock(&GlobalSMBSeslock);
 483                 list_del(&pSMBFile->flist);
 484                 list_del(&pSMBFile->tlist);
 485                 write_unlock(&GlobalSMBSeslock);
 486                 write_unlock(&file->f_owner.lock);
 487                 kfree(pSMBFile->search_resume_name);
 488                 kfree(file->private_data);
 489                 file->private_data = NULL;
 490         } else
 491                 rc = -EBADF;
 492
 493         if (list_empty(&(CIFS_I(inode)->openFileList))) {
 494                 cFYI(1, ("closing last open instance for inode %p", inode));
 495                 /* if the file is not open we do not know if we can cache info
 496                    on this inode, much less write behind and read ahead */
 497                 CIFS_I(inode)->clientCanCacheRead = FALSE;
 498                 CIFS_I(inode)->clientCanCacheAll  = FALSE;
 499         }
 500         if ((rc ==0) && CIFS_I(inode)->write_behind_rc)
 501                 rc = CIFS_I(inode)->write_behind_rc;
 502         FreeXid(xid);
 503         return rc;
 504 }
 505
 506 int cifs_closedir(struct inode *inode, struct file *file)
 507 {
 508         int rc = 0;
 509         int xid;
 510         struct cifsFileInfo *pCFileStruct =
 511             (struct cifsFileInfo *)file->private_data;
 512         char *ptmp;
 513
 514         cFYI(1, ("Closedir inode = 0x%p with ", inode));
 515
 516         xid = GetXid();
 517
 518         if (pCFileStruct) {
 519                 struct cifsTconInfo *pTcon;
 520                 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 521
 522                 pTcon = cifs_sb->tcon;
 523
 524                 cFYI(1, ("Freeing private data in close dir"));
 525                 if ((pCFileStruct->srch_inf.endOfSearch == FALSE) &&
 526                    (pCFileStruct->invalidHandle == FALSE)) {
 527                         pCFileStruct->invalidHandle = TRUE;
 528                         rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid);
 529                         cFYI(1, ("Closing uncompleted readdir with rc %d",
 530                                  rc));
 531                         /* not much we can do if it fails anyway, ignore rc */
 532                         rc = 0;
 533                 }
 534                 ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
 535                 if (ptmp) {
 536    /* BB removeme BB */ cFYI(1, ("freeing smb buf in srch struct in closedir"));
 537                         pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
 538                         cifs_buf_release(ptmp);
 539                 }
 540                 ptmp = pCFileStruct->search_resume_name;
 541                 if (ptmp) {
 542    /* BB removeme BB */ cFYI(1, ("freeing resume name in closedir"));
 543                         pCFileStruct->search_resume_name = NULL;
 544                         kfree(ptmp);
 545                 }
 546                 kfree(file->private_data);
 547                 file->private_data = NULL;
 548         }
 549         /* BB can we lock the filestruct while this is going on? */
 550         FreeXid(xid);
 551         return rc;
 552 }
 553
 554 int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 555 {
 556         int rc, xid;
 557         __u32 lockType = LOCKING_ANDX_LARGE_FILES;
 558         __u32 numLock = 0;
 559         __u32 numUnlock = 0;
 560         __u64 length;
 561         int wait_flag = FALSE;
 562         struct cifs_sb_info *cifs_sb;
 563         struct cifsTconInfo *pTcon;
 564
 565         length = 1 + pfLock->fl_end - pfLock->fl_start;
 566         rc = -EACCES;
 567         xid = GetXid();
 568
 569         cFYI(1, ("Lock parm: 0x%x flockflags: "
 570                  "0x%x flocktype: 0x%x start: %lld end: %lld",
 571                 cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start,
 572                 pfLock->fl_end));
 573
 574         if (pfLock->fl_flags & FL_POSIX)
 575                 cFYI(1, ("Posix "));
 576         if (pfLock->fl_flags & FL_FLOCK)
 577                 cFYI(1, ("Flock "));
 578         if (pfLock->fl_flags & FL_SLEEP) {
 579                 cFYI(1, ("Blocking lock "));
 580                 wait_flag = TRUE;
 581         }
 582         if (pfLock->fl_flags & FL_ACCESS)
 583                 cFYI(1, ("Process suspended by mandatory locking - "
 584                          "not implemented yet "));
 585         if (pfLock->fl_flags & FL_LEASE)
 586                 cFYI(1, ("Lease on file - not implemented yet"));
 587         if (pfLock->fl_flags &
 588             (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE)))
 589                 cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags));
 590
 591         if (pfLock->fl_type == F_WRLCK) {
 592                 cFYI(1, ("F_WRLCK "));
 593                 numLock = 1;
 594         } else if (pfLock->fl_type == F_UNLCK) {
 595                 cFYI(1, ("F_UNLCK "));
 596                 numUnlock = 1;
 597         } else if (pfLock->fl_type == F_RDLCK) {
 598                 cFYI(1, ("F_RDLCK "));
 599                 lockType |= LOCKING_ANDX_SHARED_LOCK;
 600                 numLock = 1;
 601         } else if (pfLock->fl_type == F_EXLCK) {
 602                 cFYI(1, ("F_EXLCK "));
 603                 numLock = 1;
 604         } else if (pfLock->fl_type == F_SHLCK) {
 605                 cFYI(1, ("F_SHLCK "));
 606                 lockType |= LOCKING_ANDX_SHARED_LOCK;
 607                 numLock = 1;
 608         } else
 609                 cFYI(1, ("Unknown type of lock "));
 610
 611         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 612         pTcon = cifs_sb->tcon;
 613
 614         if (file->private_data == NULL) {
 615                 FreeXid(xid);
 616                 return -EBADF;
 617         }
 618
 619         if (IS_GETLK(cmd)) {
 620                 rc = CIFSSMBLock(xid, pTcon,
 621                                  ((struct cifsFileInfo *)file->
 622                                   private_data)->netfid,
 623                                  length,
 624                                  pfLock->fl_start, 0, 1, lockType,
 625                                  0 /* wait flag */ );
 626                 if (rc == 0) {
 627                         rc = CIFSSMBLock(xid, pTcon,
 628                                          ((struct cifsFileInfo *) file->
 629                                           private_data)->netfid,
 630                                          length,
 631                                          pfLock->fl_start, 1 /* numUnlock */ ,
 632                                          0 /* numLock */ , lockType,
 633                                          0 /* wait flag */ );
 634                         pfLock->fl_type = F_UNLCK;
 635                         if (rc != 0)
 636                                 cERROR(1, ("Error unlocking previously locked "
 637                                            "range %d during test of lock ",
 638                                            rc));
 639                         rc = 0;
 640
 641                 } else {
 642                         /* if rc == ERR_SHARING_VIOLATION ? */
 643                         rc = 0; /* do not change lock type to unlock
 644                                    since range in use */
 645                 }
 646
 647                 FreeXid(xid);
 648                 return rc;
 649         }
 650
 651         rc = CIFSSMBLock(xid, pTcon,
 652                          ((struct cifsFileInfo *) file->private_data)->
 653                          netfid, length,
 654                          pfLock->fl_start, numUnlock, numLock, lockType,
 655                          wait_flag);
 656         if (pfLock->fl_flags & FL_POSIX)
 657                 posix_lock_file_wait(file, pfLock);
 658         FreeXid(xid);
 659         return rc;
 660 }
 661
 662 ssize_t cifs_user_write(struct file *file, const char __user *write_data,
 663         size_t write_size, loff_t *poffset)
 664 {
 665         int rc = 0;
 666         unsigned int bytes_written = 0;
 667         unsigned int total_written;
 668         struct cifs_sb_info *cifs_sb;
 669         struct cifsTconInfo *pTcon;
 670         int xid, long_op;
 671         struct cifsFileInfo *open_file;
 672
 673         if (file->f_dentry == NULL)
 674                 return -EBADF;
 675
 676         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 677         if (cifs_sb == NULL)
 678                 return -EBADF;
 679
 680         pTcon = cifs_sb->tcon;
 681
 682         /* cFYI(1,
 683            (" write %d bytes to offset %lld of %s", write_size,
 684            *poffset, file->f_dentry->d_name.name)); */
 685
 686         if (file->private_data == NULL)
 687                 return -EBADF;
 688         else
 689                 open_file = (struct cifsFileInfo *) file->private_data;
 690
 691         xid = GetXid();
 692         if (file->f_dentry->d_inode == NULL) {
 693                 FreeXid(xid);
 694                 return -EBADF;
 695         }
 696
 697         if (*poffset > file->f_dentry->d_inode->i_size)
 698                 long_op = 2; /* writes past end of file can take a long time */
 699         else
 700                 long_op = 1;
 701
 702         for (total_written = 0; write_size > total_written;
 703              total_written += bytes_written) {
 704                 rc = -EAGAIN;
 705                 while (rc == -EAGAIN) {
 706                         if (file->private_data == NULL) {
 707                                 /* file has been closed on us */
 708                                 FreeXid(xid);
 709                         /* if we have gotten here we have written some data
 710                            and blocked, and the file has been freed on us while
 711                            we blocked so return what we managed to write */
 712                                 return total_written;
 713                         }
 714                         if (open_file->closePend) {
 715                                 FreeXid(xid);
 716                                 if (total_written)
 717                                         return total_written;
 718                                 else
 719                                         return -EBADF;
 720                         }
 721                         if (open_file->invalidHandle) {
 722                                 if ((file->f_dentry == NULL) ||
 723                                     (file->f_dentry->d_inode == NULL)) {
 724                                         FreeXid(xid);
 725                                         return total_written;
 726                                 }
 727                                 /* we could deadlock if we called
 728                                    filemap_fdatawait from here so tell
 729                                    reopen_file not to flush data to server
 730                                    now */
 731                                 rc = cifs_reopen_file(file->f_dentry->d_inode,
 732                                         file, FALSE);
 733                                 if (rc != 0)
 734                                         break;
 735                         }
 736
 737                         rc = CIFSSMBWrite(xid, pTcon,
 738                                 open_file->netfid,
 739                                 min_t(const int, cifs_sb->wsize,
 740                                       write_size - total_written),
 741                                 *poffset, &bytes_written,
 742                                 NULL, write_data + total_written, long_op);
 743                 }
 744                 if (rc || (bytes_written == 0)) {
 745                         if (total_written)
 746                                 break;
 747                         else {
 748                                 FreeXid(xid);
 749                                 return rc;
 750                         }
 751                 } else
 752                         *poffset += bytes_written;
 753                 long_op = FALSE; /* subsequent writes fast -
 754                                     15 seconds is plenty */
 755         }
 756
 757         cifs_stats_bytes_written(pTcon, total_written);
 758
 759         /* since the write may have blocked check these pointers again */
 760         if (file->f_dentry) {
 761                 if (file->f_dentry->d_inode) {
 762                         struct inode *inode = file->f_dentry->d_inode;
 763                         inode->i_ctime = inode->i_mtime =
 764                                 current_fs_time(inode->i_sb);
 765                         if (total_written > 0) {
 766                                 if (*poffset > file->f_dentry->d_inode->i_size)
 767                                         i_size_write(file->f_dentry->d_inode,
 768                                         *poffset);
 769                         }
 770                         mark_inode_dirty_sync(file->f_dentry->d_inode);
 771                 }
 772         }
 773         FreeXid(xid);
 774         return total_written;
 775 }
 776
 777 static ssize_t cifs_write(struct file *file, const char *write_data,
 778         size_t write_size, loff_t *poffset)
 779 {
 780         int rc = 0;
 781         unsigned int bytes_written = 0;
 782         unsigned int total_written;
 783         struct cifs_sb_info *cifs_sb;
 784         struct cifsTconInfo *pTcon;
 785         int xid, long_op;
 786         struct cifsFileInfo *open_file;
 787
 788         if (file->f_dentry == NULL)
 789                 return -EBADF;
 790
 791         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 792         if (cifs_sb == NULL)
 793                 return -EBADF;
 794
 795         pTcon = cifs_sb->tcon;
 796
 797         cFYI(1,("write %zd bytes to offset %lld of %s", write_size,
 798            *poffset, file->f_dentry->d_name.name));
 799
 800         if (file->private_data == NULL)
 801                 return -EBADF;
 802         else
 803                 open_file = (struct cifsFileInfo *)file->private_data;
 804
 805         xid = GetXid();
 806         if (file->f_dentry->d_inode == NULL) {
 807                 FreeXid(xid);
 808                 return -EBADF;
 809         }
 810
 811         if (*poffset > file->f_dentry->d_inode->i_size)
 812                 long_op = 2; /* writes past end of file can take a long time */
 813         else
 814                 long_op = 1;
 815
 816         for (total_written = 0; write_size > total_written;
 817              total_written += bytes_written) {
 818                 rc = -EAGAIN;
 819                 while (rc == -EAGAIN) {
 820                         if (file->private_data == NULL) {
 821                                 /* file has been closed on us */
 822                                 FreeXid(xid);
 823                         /* if we have gotten here we have written some data
 824                            and blocked, and the file has been freed on us
 825                            while we blocked so return what we managed to
 826                            write */
 827                                 return total_written;
 828                         }
 829                         if (open_file->closePend) {
 830                                 FreeXid(xid);
 831                                 if (total_written)
 832                                         return total_written;
 833                                 else
 834                                         return -EBADF;
 835                         }
 836                         if (open_file->invalidHandle) {
 837                                 if ((file->f_dentry == NULL) ||
 838                                    (file->f_dentry->d_inode == NULL)) {
 839                                         FreeXid(xid);
 840                                         return total_written;
 841                                 }
 842                                 /* we could deadlock if we called
 843                                    filemap_fdatawait from here so tell
 844                                    reopen_file not to flush data to
 845                                    server now */
 846                                 rc = cifs_reopen_file(file->f_dentry->d_inode,
 847                                         file, FALSE);
 848                                 if (rc != 0)
 849                                         break;
 850                         }
 851 #ifdef CONFIG_CIFS_EXPERIMENTAL
 852                         /* BB FIXME We can not sign across two buffers yet */
 853                         if((experimEnabled) && ((pTcon->ses->server->secMode &
 854                          (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) == 0)) {
 855                                 struct kvec iov[2];
 856                                 unsigned int len;
 857
 858                                 len = min(cifs_sb->wsize,
 859                                           write_size - total_written);
 860                                 /* iov[0] is reserved for smb header */
 861                                 iov[1].iov_base = (char *)write_data +
 862                                                   total_written;
 863                                 iov[1].iov_len = len;
 864                                 rc = CIFSSMBWrite2(xid, pTcon,
 865                                                 open_file->netfid, len,
 866                                                 *poffset, &bytes_written,
 867                                                 iov, 1, long_op);
 868                         } else
 869                         /* BB FIXME fixup indentation of line below */
 870 #endif
 871                         rc = CIFSSMBWrite(xid, pTcon,
 872                                  open_file->netfid,
 873                                  min_t(const int, cifs_sb->wsize,
 874                                        write_size - total_written),
 875                                  *poffset, &bytes_written,
 876                                  write_data + total_written, NULL, long_op);
 877                 }
 878                 if (rc || (bytes_written == 0)) {
 879                         if (total_written)
 880                                 break;
 881                         else {
 882                                 FreeXid(xid);
 883                                 return rc;
 884                         }
 885                 } else
 886                         *poffset += bytes_written;
 887                 long_op = FALSE; /* subsequent writes fast -
 888                                     15 seconds is plenty */
 889         }
 890
 891         cifs_stats_bytes_written(pTcon, total_written);
 892
 893         /* since the write may have blocked check these pointers again */
 894         if (file->f_dentry) {
 895                 if (file->f_dentry->d_inode) {
 896                         file->f_dentry->d_inode->i_ctime =
 897                         file->f_dentry->d_inode->i_mtime = CURRENT_TIME;
 898                         if (total_written > 0) {
 899                                 if (*poffset > file->f_dentry->d_inode->i_size)
 900                                         i_size_write(file->f_dentry->d_inode,
 901                                                      *poffset);
 902                         }
 903                         mark_inode_dirty_sync(file->f_dentry->d_inode);
 904                 }
 905         }
 906         FreeXid(xid);
 907         return total_written;
 908 }
 909
 910 static struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
 911 {
 912         struct cifsFileInfo *open_file;
 913
 914         read_lock(&GlobalSMBSeslock);
 915         list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
 916                 if (open_file->closePend)
 917                         continue;
 918                 if (open_file->pfile &&
 919                     ((open_file->pfile->f_flags & O_RDWR) ||
 920                      (open_file->pfile->f_flags & O_WRONLY))) {
 921                         read_unlock(&GlobalSMBSeslock);
 922                         if(open_file->invalidHandle) {
 923                                 rc = cifs_reopen_file(cifs_inode->vfs_inode,
 924                                                       open_file->pfile, FALSE);
 925                                 /* if it fails, try another handle - might be */
 926                                 /* dangerous to hold up writepages with retry */
 927                                 if(rc) {
 928                                         cFYI(1,("failed on reopen file in wp"));
 929                                         read_lock(&GlobalSMBSeslock);
 930                                         continue;
 931                                 }
 932                         }
 933                         return open_file;
 934                 }
 935         }
 936         read_unlock(&GlobalSMBSeslock);
 937         return NULL;
 938 }
 939
 940 static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
 941 {
 942         struct address_space *mapping = page->mapping;
 943         loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
 944         char *write_data;
 945         int rc = -EFAULT;
 946         int bytes_written = 0;
 947         struct cifs_sb_info *cifs_sb;
 948         struct cifsTconInfo *pTcon;
 949         struct inode *inode;
 950         struct cifsFileInfo *open_file;
 951
 952         if (!mapping || !mapping->host)
 953                 return -EFAULT;
 954
 955         inode = page->mapping->host;
 956         cifs_sb = CIFS_SB(inode->i_sb);
 957         pTcon = cifs_sb->tcon;
 958
 959         offset += (loff_t)from;
 960         write_data = kmap(page);
 961         write_data += from;
 962
 963         if ((to > PAGE_CACHE_SIZE) || (from > to)) {
 964                 kunmap(page);
 965                 return -EIO;
 966         }
 967
 968         /* racing with truncate? */
 969         if (offset > mapping->host->i_size) {
 970                 kunmap(page);
 971                 return 0; /* don't care */
 972         }
 973
 974         /* check to make sure that we are not extending the file */
 975         if (mapping->host->i_size - offset < (loff_t)to)
 976                 to = (unsigned)(mapping->host->i_size - offset);
 977
 978         open_file = find_writable_file(CIFS_I(mapping->host));
 979         if (open_file) {
 980                 bytes_written = cifs_write(open_file->pfile, write_data,
 981                                            to-from, &offset);
 982                 /* Does mm or vfs already set times? */
 983                 inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
 984                 if ((bytes_written > 0) && (offset)) {
 985                         rc = 0;
 986                 } else if (bytes_written < 0) {
 987                         if (rc != -EBADF)
 988                                 rc = bytes_written;
 989                 }
 990         } else {
 991                 cFYI(1, ("No writeable filehandles for inode"));
 992                 rc = -EIO;
 993         }
 994
 995         kunmap(page);
 996         return rc;
 997 }
 998
 999 #ifdef CONFIG_CIFS_EXPERIMENTAL
1000 static int cifs_writepages(struct address_space *mapping,
1001                            struct writeback_control *wbc)
1002 {
1003         struct backing_dev_info *bdi = mapping->backing_dev_info;
1004         unsigned int bytes_to_write;
1005         unsigned int bytes_written;
1006         struct cifs_sb_info *cifs_sb;
1007         int done = 0;
1008         pgoff_t end = -1;
1009         pgoff_t index;
1010         int is_range = 0;
1011         struct kvec iov[32];
1012         int n_iov = 0;
1013         pgoff_t next;
1014         int nr_pages;
1015         __u64 offset = 0;
1016         struct cifsFileInfo *open_file = NULL;
1017         struct page *page;
1018         struct pagevec pvec;
1019         int rc = 0;
1020         int scanned = 0;
1021         int xid;
1022
1023         cifs_sb = CIFS_SB(mapping->host->i_sb);
1024
1025         /*
1026          * If wsize is smaller that the page cache size, default to writing
1027          * one page at a time via cifs_writepage
1028          */
1029         if (cifs_sb->wsize < PAGE_CACHE_SIZE)
1030                 return generic_writepages(mapping, wbc);
1031
1032         /* BB FIXME we do not have code to sign across multiple buffers yet,
1033            so go to older writepage style write which we can sign if needed */
1034         if((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server))
1035                 if(cifs_sb->tcon->ses->server->secMode &
1036                           (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
1037                         return generic_writepages(mapping, wbc);
1038
1039         /*
1040          * BB: Is this meaningful for a non-block-device file system?
1041          * If it is, we should test it again after we do I/O
1042          */
1043         if (wbc->nonblocking && bdi_write_congested(bdi)) {
1044                 wbc->encountered_congestion = 1;
1045                 return 0;
1046         }
1047
1048         xid = GetXid();
1049
1050         pagevec_init(&pvec, 0);
1051         if (wbc->sync_mode == WB_SYNC_NONE)
1052                 index = mapping->writeback_index; /* Start from prev offset */
1053         else {
1054                 index = 0;
1055                 scanned = 1;
1056         }
1057         if (wbc->start || wbc->end) {
1058                 index = wbc->start >> PAGE_CACHE_SHIFT;
1059                 end = wbc->end >> PAGE_CACHE_SHIFT;
1060                 is_range = 1;
1061                 scanned = 1;
1062         }
1063 retry:
1064         while (!done && (index <= end) &&
1065                (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
1066                         PAGECACHE_TAG_DIRTY,
1067                         min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) {
1068                 int first;
1069                 unsigned int i;
1070
1071                 if (!open_file) {
1072                         open_file = find_writable_file(CIFS_I(mapping->host));
1073                         if (!open_file) {
1074                                 pagevec_release(&pvec);
1075                                 cERROR(1, ("No writable handles for inode"));
1076                                 return -EIO;
1077                         }
1078                 }
1079
1080                 first = -1;
1081                 next = 0;
1082                 n_iov = 0;
1083                 bytes_to_write = 0;
1084
1085                 for (i = 0; i < nr_pages; i++) {
1086                         page = pvec.pages[i];
1087                         /*
1088                          * At this point we hold neither mapping->tree_lock nor
1089                          * lock on the page itself: the page may be truncated or
1090                          * invalidated (changing page->mapping to NULL), or even
1091                          * swizzled back from swapper_space to tmpfs file
1092                          * mapping
1093                          */
1094
1095                         if (first < 0)
1096                                 lock_page(page);
1097                         else if (TestSetPageLocked(page))
1098                                 break;
1099
1100                         if (unlikely(page->mapping != mapping)) {
1101                                 unlock_page(page);
1102                                 break;
1103                         }
1104
1105                         if (unlikely(is_range) && (page->index > end)) {
1106                                 done = 1;
1107                                 unlock_page(page);
1108                                 break;
1109                         }
1110
1111                         if (next && (page->index != next)) {
1112                                 /* Not next consecutive page */
1113                                 unlock_page(page);
1114                                 break;
1115                         }
1116
1117                         if (wbc->sync_mode != WB_SYNC_NONE)
1118                                 wait_on_page_writeback(page);
1119
1120                         if (PageWriteback(page) ||
1121                                         !test_clear_page_dirty(page)) {
1122                                 unlock_page(page);
1123                                 break;
1124                         }
1125                         /*
1126                          * BB can we get rid of this?  pages are held by pvec
1127                          */
1128                         page_cache_get(page);
1129
1130                         /* reserve iov[0] for the smb header */
1131                         n_iov++;
1132                         iov[n_iov].iov_base = kmap(page);
1133                         iov[n_iov].iov_len = PAGE_CACHE_SIZE;
1134                         bytes_to_write += PAGE_CACHE_SIZE;
1135
1136                         if (first < 0) {
1137                                 first = i;
1138                                 offset = page_offset(page);
1139                         }
1140                         next = page->index + 1;
1141                         if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize)
1142                                 break;
1143                 }
1144                 if (n_iov) {
1145                         rc = CIFSSMBWrite2(xid, cifs_sb->tcon,
1146                                            open_file->netfid, bytes_to_write,
1147                                            offset, &bytes_written, iov, n_iov,
1148                                            1);
1149                         if (rc || bytes_written < bytes_to_write) {
1150                                 cERROR(1,("CIFSSMBWrite2 returned %d, written = %x",
1151                                           rc, bytes_written));
1152                                 set_bit(AS_EIO, &mapping->flags);
1153                                 SetPageError(page);
1154                         }
1155                         for (i = 0; i < n_iov; i++) {
1156                                 page = pvec.pages[first + i];
1157                                 kunmap(page);
1158                                 unlock_page(page);
1159                                 page_cache_release(page);
1160                         }
1161                         if ((wbc->nr_to_write -= n_iov) <= 0)
1162                                 done = 1;
1163                         index = next;
1164                 }
1165                 pagevec_release(&pvec);
1166         }
1167         if (!scanned && !done) {
1168                 /*
1169                  * We hit the last page and there is more work to be done: wrap
1170                  * back to the start of the file
1171                  */
1172                 scanned = 1;
1173                 index = 0;
1174                 goto retry;
1175         }
1176         if (!is_range)
1177                 mapping->writeback_index = index;
1178
1179         FreeXid(xid);
1180
1181         return rc;
1182 }
1183 #endif
1184
1185 static int cifs_writepage(struct page* page, struct writeback_control *wbc)
1186 {
1187         int rc = -EFAULT;
1188         int xid;
1189
1190         xid = GetXid();
1191 /* BB add check for wbc flags */
1192         page_cache_get(page);
1193         if (!PageUptodate(page)) {
1194                 cFYI(1, ("ppw - page not up to date"));
1195         }
1196
1197         rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
1198         SetPageUptodate(page); /* BB add check for error and Clearuptodate? */
1199         unlock_page(page);
1200         page_cache_release(page);
1201         FreeXid(xid);
1202         return rc;
1203 }
1204
1205 static int cifs_commit_write(struct file *file, struct page *page,
1206         unsigned offset, unsigned to)
1207 {
1208         int xid;
1209         int rc = 0;
1210         struct inode *inode = page->mapping->host;
1211         loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
1212         char *page_data;
1213
1214         xid = GetXid();
1215         cFYI(1, ("commit write for page %p up to position %lld for %d",
1216                  page, position, to));
1217         if (position > inode->i_size) {
1218                 i_size_write(inode, position);
1219                 /* if (file->private_data == NULL) {
1220                         rc = -EBADF;
1221                 } else {
1222                         open_file = (struct cifsFileInfo *)file->private_data;
1223                         cifs_sb = CIFS_SB(inode->i_sb);
1224                         rc = -EAGAIN;
1225                         while (rc == -EAGAIN) {
1226                                 if ((open_file->invalidHandle) &&
1227                                     (!open_file->closePend)) {
1228                                         rc = cifs_reopen_file(
1229                                                 file->f_dentry->d_inode, file);
1230                                         if (rc != 0)
1231                                                 break;
1232                                 }
1233                                 if (!open_file->closePend) {
1234                                         rc = CIFSSMBSetFileSize(xid,
1235                                                 cifs_sb->tcon, position,
1236                                                 open_file->netfid,
1237                                                 open_file->pid, FALSE);
1238                                 } else {
1239                                         rc = -EBADF;
1240                                         break;
1241                                 }
1242                         }
1243                         cFYI(1, (" SetEOF (commit write) rc = %d", rc));
1244                 } */
1245         }
1246         if (!PageUptodate(page)) {
1247                 position =  ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset;
1248                 /* can not rely on (or let) writepage write this data */
1249                 if (to < offset) {
1250                         cFYI(1, ("Illegal offsets, can not copy from %d to %d",
1251                                 offset, to));
1252                         FreeXid(xid);
1253                         return rc;
1254                 }
1255                 /* this is probably better than directly calling
1256                    partialpage_write since in this function the file handle is
1257                    known which we might as well leverage */
1258                 /* BB check if anything else missing out of ppw
1259                    such as updating last write time */
1260                 page_data = kmap(page);
1261                 rc = cifs_write(file, page_data + offset, to-offset,
1262                                 &position);
1263                 if (rc > 0)
1264                         rc = 0;
1265                 /* else if (rc < 0) should we set writebehind rc? */
1266                 kunmap(page);
1267         } else {
1268                 set_page_dirty(page);
1269         }
1270
1271         FreeXid(xid);
1272         return rc;
1273 }
1274
1275 int cifs_fsync(struct file *file, struct dentry *dentry, int datasync)
1276 {
1277         int xid;
1278         int rc = 0;
1279         struct inode *inode = file->f_dentry->d_inode;
1280
1281         xid = GetXid();
1282
1283         cFYI(1, ("Sync file - name: %s datasync: 0x%x ",
1284                 dentry->d_name.name, datasync));
1285
1286         rc = filemap_fdatawrite(inode->i_mapping);
1287         if (rc == 0)
1288                 CIFS_I(inode)->write_behind_rc = 0;
1289         FreeXid(xid);
1290         return rc;
1291 }
1292
1293 /* static int cifs_sync_page(struct page *page)
1294 {
1295         struct address_space *mapping;
1296         struct inode *inode;
1297         unsigned long index = page->index;
1298         unsigned int rpages = 0;
1299         int rc = 0;
1300
1301         cFYI(1, ("sync page %p",page));
1302         mapping = page->mapping;
1303         if (!mapping)
1304                 return 0;
1305         inode = mapping->host;
1306         if (!inode)
1307                 return 0; */
1308
1309 /*      fill in rpages then
1310         result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */
1311
1312 /*      cFYI(1, ("rpages is %d for sync page of Index %ld ", rpages, index));
1313
1314         if (rc < 0)
1315                 return rc;
1316         return 0;
1317 } */
1318
1319 /*
1320  * As file closes, flush all cached write data for this inode checking
1321  * for write behind errors.
1322  */
1323 int cifs_flush(struct file *file)
1324 {
1325         struct inode * inode = file->f_dentry->d_inode;
1326         int rc = 0;
1327
1328         /* Rather than do the steps manually:
1329            lock the inode for writing
1330            loop through pages looking for write behind data (dirty pages)
1331            coalesce into contiguous 16K (or smaller) chunks to write to server
1332            send to server (prefer in parallel)
1333            deal with writebehind errors
1334            unlock inode for writing
1335            filemapfdatawrite appears easier for the time being */
1336
1337         rc = filemap_fdatawrite(inode->i_mapping);
1338         if (!rc) /* reset wb rc if we were able to write out dirty pages */
1339                 CIFS_I(inode)->write_behind_rc = 0;
1340
1341         cFYI(1, ("Flush inode %p file %p rc %d",inode,file,rc));
1342
1343         return rc;
1344 }
1345
1346 ssize_t cifs_user_read(struct file *file, char __user *read_data,
1347         size_t read_size, loff_t *poffset)
1348 {
1349         int rc = -EACCES;
1350         unsigned int bytes_read = 0;
1351         unsigned int total_read = 0;
1352         unsigned int current_read_size;
1353         struct cifs_sb_info *cifs_sb;
1354         struct cifsTconInfo *pTcon;
1355         int xid;
1356         struct cifsFileInfo *open_file;
1357         char *smb_read_data;
1358         char __user *current_offset;
1359         struct smb_com_read_rsp *pSMBr;
1360
1361         xid = GetXid();
1362         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
1363         pTcon = cifs_sb->tcon;
1364
1365         if (file->private_data == NULL) {
1366                 FreeXid(xid);
1367                 return -EBADF;
1368         }
1369         open_file = (struct cifsFileInfo *)file->private_data;
1370
1371         if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
1372                 cFYI(1, ("attempting read on write only file instance"));
1373         }
1374         for (total_read = 0, current_offset = read_data;
1375              read_size > total_read;
1376              total_read += bytes_read, current_offset += bytes_read) {
1377                 current_read_size = min_t(const int, read_size - total_read,
1378                                           cifs_sb->rsize);
1379                 rc = -EAGAIN;
1380                 smb_read_data = NULL;
1381                 while (rc == -EAGAIN) {
1382                         if ((open_file->invalidHandle) &&
1383                             (!open_file->closePend)) {
1384                                 rc = cifs_reopen_file(file->f_dentry->d_inode,
1385                                         file, TRUE);
1386                                 if (rc != 0)
1387                                         break;
1388                         }
1389                         rc = CIFSSMBRead(xid, pTcon,
1390                                         open_file->netfid,
1391                                         current_read_size, *poffset,
1392                                         &bytes_read, &smb_read_data);
1393                         pSMBr = (struct smb_com_read_rsp *)smb_read_data;
1394                         if (copy_to_user(current_offset,
1395                                          smb_read_data + 4 /* RFC1001 hdr */
1396                                          + le16_to_cpu(pSMBr->DataOffset),
1397                                          bytes_read)) {
1398                                 rc = -EFAULT;
1399                                 FreeXid(xid);
1400                                 return rc;
1401             }
1402                         if (smb_read_data) {
1403                                 cifs_buf_release(smb_read_data);
1404                                 smb_read_data = NULL;
1405                         }
1406                 }
1407                 if (rc || (bytes_read == 0)) {
1408                         if (total_read) {
1409                                 break;
1410                         } else {
1411                                 FreeXid(xid);
1412                                 return rc;
1413                         }
1414                 } else {
1415                         cifs_stats_bytes_read(pTcon, bytes_read);
1416                         *poffset += bytes_read;
1417                 }
1418         }
1419         FreeXid(xid);
1420         return total_read;
1421 }
1422
1423
1424 static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
1425         loff_t *poffset)
1426 {
1427         int rc = -EACCES;
1428         unsigned int bytes_read = 0;
1429         unsigned int total_read;
1430         unsigned int current_read_size;
1431         struct cifs_sb_info *cifs_sb;
1432         struct cifsTconInfo *pTcon;
1433         int xid;
1434         char *current_offset;
1435         struct cifsFileInfo *open_file;
1436
1437         xid = GetXid();
1438         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
1439         pTcon = cifs_sb->tcon;
1440
1441         if (file->private_data == NULL) {
1442                 FreeXid(xid);
1443                 return -EBADF;
1444         }
1445         open_file = (struct cifsFileInfo *)file->private_data;
1446
1447         if ((file->f_flags & O_ACCMODE) == O_WRONLY)
1448                 cFYI(1, ("attempting read on write only file instance"));
1449
1450         for (total_read = 0, current_offset = read_data;
1451              read_size > total_read;
1452              total_read += bytes_read, current_offset += bytes_read) {
1453                 current_read_size = min_t(const int, read_size - total_read,
1454                                           cifs_sb->rsize);
1455                 /* For windows me and 9x we do not want to request more
1456                 than it negotiated since it will refuse the read then */
1457                 if((pTcon->ses) &&
1458                         !(pTcon->ses->capabilities & CAP_LARGE_FILES)) {
1459                         current_read_size = min_t(const int, current_read_size,
1460                                         pTcon->ses->server->maxBuf - 128);
1461                 }
1462                 rc = -EAGAIN;
1463                 while (rc == -EAGAIN) {
1464                         if ((open_file->invalidHandle) &&
1465                             (!open_file->closePend)) {
1466                                 rc = cifs_reopen_file(file->f_dentry->d_inode,
1467                                         file, TRUE);
1468                                 if (rc != 0)
1469                                         break;
1470                         }
1471                         rc = CIFSSMBRead(xid, pTcon,
1472                                         open_file->netfid,
1473                                         current_read_size, *poffset,
1474                                         &bytes_read, &current_offset);
1475                 }
1476                 if (rc || (bytes_read == 0)) {
1477                         if (total_read) {
1478                                 break;
1479                         } else {
1480                                 FreeXid(xid);
1481                                 return rc;
1482                         }
1483                 } else {
1484                         cifs_stats_bytes_read(pTcon, total_read);
1485                         *poffset += bytes_read;
1486                 }
1487         }
1488         FreeXid(xid);
1489         return total_read;
1490 }
1491
1492 int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
1493 {
1494         struct dentry *dentry = file->f_dentry;
1495         int rc, xid;
1496
1497         xid = GetXid();
1498         rc = cifs_revalidate(dentry);
1499         if (rc) {
1500                 cFYI(1, ("Validation prior to mmap failed, error=%d", rc));
1501                 FreeXid(xid);
1502                 return rc;
1503         }
1504         rc = generic_file_mmap(file, vma);
1505         FreeXid(xid);
1506         return rc;
1507 }
1508
1509
1510 static void cifs_copy_cache_pages(struct address_space *mapping,
1511         struct list_head *pages, int bytes_read, char *data,
1512         struct pagevec *plru_pvec)
1513 {
1514         struct page *page;
1515         char *target;
1516
1517         while (bytes_read > 0) {
1518                 if (list_empty(pages))
1519                         break;
1520
1521                 page = list_entry(pages->prev, struct page, lru);
1522                 list_del(&page->lru);
1523
1524                 if (add_to_page_cache(page, mapping, page->index,
1525                                       GFP_KERNEL)) {
1526                         page_cache_release(page);
1527                         cFYI(1, ("Add page cache failed"));
1528                         data += PAGE_CACHE_SIZE;
1529                         bytes_read -= PAGE_CACHE_SIZE;
1530                         continue;
1531                 }
1532
1533                 target = kmap_atomic(page,KM_USER0);
1534
1535                 if (PAGE_CACHE_SIZE > bytes_read) {
1536                         memcpy(target, data, bytes_read);
1537                         /* zero the tail end of this partial page */
1538                         memset(target + bytes_read, 0,
1539                                PAGE_CACHE_SIZE - bytes_read);
1540                         bytes_read = 0;
1541                 } else {
1542                         memcpy(target, data, PAGE_CACHE_SIZE);
1543                         bytes_read -= PAGE_CACHE_SIZE;
1544                 }
1545                 kunmap_atomic(target, KM_USER0);
1546
1547                 flush_dcache_page(page);
1548                 SetPageUptodate(page);
1549                 unlock_page(page);
1550                 if (!pagevec_add(plru_pvec, page))
1551                         __pagevec_lru_add(plru_pvec);
1552                 data += PAGE_CACHE_SIZE;
1553         }
1554         return;
1555 }
1556
1557 static int cifs_readpages(struct file *file, struct address_space *mapping,
1558         struct list_head *page_list, unsigned num_pages)
1559 {
1560         int rc = -EACCES;
1561         int xid;
1562         loff_t offset;
1563         struct page *page;
1564         struct cifs_sb_info *cifs_sb;
1565         struct cifsTconInfo *pTcon;
1566         int bytes_read = 0;
1567         unsigned int read_size,i;
1568         char *smb_read_data = NULL;
1569         struct smb_com_read_rsp *pSMBr;
1570         struct pagevec lru_pvec;
1571         struct cifsFileInfo *open_file;
1572
1573         xid = GetXid();
1574         if (file->private_data == NULL) {
1575                 FreeXid(xid);
1576                 return -EBADF;
1577         }
1578         open_file = (struct cifsFileInfo *)file->private_data;
1579         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
1580         pTcon = cifs_sb->tcon;
1581
1582         pagevec_init(&lru_pvec, 0);
1583
1584         for (i = 0; i < num_pages; ) {
1585                 unsigned contig_pages;
1586                 struct page *tmp_page;
1587                 unsigned long expected_index;
1588
1589                 if (list_empty(page_list))
1590                         break;
1591
1592                 page = list_entry(page_list->prev, struct page, lru);
1593                 offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1594
1595                 /* count adjacent pages that we will read into */
1596                 contig_pages = 0;
1597                 expected_index =
1598                         list_entry(page_list->prev, struct page, lru)->index;
1599                 list_for_each_entry_reverse(tmp_page,page_list,lru) {
1600                         if (tmp_page->index == expected_index) {
1601                                 contig_pages++;
1602                                 expected_index++;
1603                         } else
1604                                 break;
1605                 }
1606                 if (contig_pages + i >  num_pages)
1607                         contig_pages = num_pages - i;
1608
1609                 /* for reads over a certain size could initiate async
1610                    read ahead */
1611
1612                 read_size = contig_pages * PAGE_CACHE_SIZE;
1613                 /* Read size needs to be in multiples of one page */
1614                 read_size = min_t(const unsigned int, read_size,
1615                                   cifs_sb->rsize & PAGE_CACHE_MASK);
1616
1617                 rc = -EAGAIN;
1618                 while (rc == -EAGAIN) {
1619                         if ((open_file->invalidHandle) &&
1620                             (!open_file->closePend)) {
1621                                 rc = cifs_reopen_file(file->f_dentry->d_inode,
1622                                         file, TRUE);
1623                                 if (rc != 0)
1624                                         break;
1625                         }
1626
1627                         rc = CIFSSMBRead(xid, pTcon,
1628                                         open_file->netfid,
1629                                         read_size, offset,
1630                                         &bytes_read, &smb_read_data);
1631
1632                         /* BB more RC checks ? */
1633                         if (rc== -EAGAIN) {
1634                                 if (smb_read_data) {
1635                                         cifs_buf_release(smb_read_data);
1636                                         smb_read_data = NULL;
1637                                 }
1638                         }
1639                 }
1640                 if ((rc < 0) || (smb_read_data == NULL)) {
1641                         cFYI(1, ("Read error in readpages: %d", rc));
1642                         /* clean up remaing pages off list */
1643                         while (!list_empty(page_list) && (i < num_pages)) {
1644                                 page = list_entry(page_list->prev, struct page,
1645                                                   lru);
1646                                 list_del(&page->lru);
1647                                 page_cache_release(page);
1648                         }
1649                         break;
1650                 } else if (bytes_read > 0) {
1651                         pSMBr = (struct smb_com_read_rsp *)smb_read_data;
1652                         cifs_copy_cache_pages(mapping, page_list, bytes_read,
1653                                 smb_read_data + 4 /* RFC1001 hdr */ +
1654                                 le16_to_cpu(pSMBr->DataOffset), &lru_pvec);
1655
1656                         i +=  bytes_read >> PAGE_CACHE_SHIFT;
1657                         cifs_stats_bytes_read(pTcon, bytes_read);
1658                         if ((int)(bytes_read & PAGE_CACHE_MASK) != bytes_read) {
1659                                 i++; /* account for partial page */
1660
1661                                 /* server copy of file can have smaller size
1662                                    than client */
1663                                 /* BB do we need to verify this common case ?
1664                                    this case is ok - if we are at server EOF
1665                                    we will hit it on next read */
1666
1667                         /* while (!list_empty(page_list) && (i < num_pages)) {
1668                                         page = list_entry(page_list->prev,
1669                                                           struct page, list);
1670                                         list_del(&page->list);
1671                                         page_cache_release(page);
1672                                 }
1673                                 break; */
1674                         }
1675                 } else {
1676                         cFYI(1, ("No bytes read (%d) at offset %lld . "
1677                                  "Cleaning remaining pages from readahead list",
1678                                  bytes_read, offset));
1679                         /* BB turn off caching and do new lookup on
1680                            file size at server? */
1681                         while (!list_empty(page_list) && (i < num_pages)) {
1682                                 page = list_entry(page_list->prev, struct page,
1683                                                   lru);
1684                                 list_del(&page->lru);
1685
1686                                 /* BB removeme - replace with zero of page? */
1687                                 page_cache_release(page);
1688                         }
1689                         break;
1690                 }
1691                 if (smb_read_data) {
1692                         cifs_buf_release(smb_read_data);
1693                         smb_read_data = NULL;
1694                 }
1695                 bytes_read = 0;
1696         }
1697
1698         pagevec_lru_add(&lru_pvec);
1699
1700 /* need to free smb_read_data buf before exit */
1701         if (smb_read_data) {
1702                 cifs_buf_release(smb_read_data);
1703                 smb_read_data = NULL;
1704         }
1705
1706         FreeXid(xid);
1707         return rc;
1708 }
1709
1710 static int cifs_readpage_worker(struct file *file, struct page *page,
1711         loff_t *poffset)
1712 {
1713         char *read_data;
1714         int rc;
1715
1716         page_cache_get(page);
1717         read_data = kmap(page);
1718         /* for reads over a certain size could initiate async read ahead */
1719
1720         rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
1721
1722         if (rc < 0)
1723                 goto io_error;
1724         else
1725                 cFYI(1, ("Bytes read %d ",rc));
1726
1727         file->f_dentry->d_inode->i_atime =
1728                 current_fs_time(file->f_dentry->d_inode->i_sb);
1729
1730         if (PAGE_CACHE_SIZE > rc)
1731                 memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);
1732
1733         flush_dcache_page(page);
1734         SetPageUptodate(page);
1735         rc = 0;
1736
1737 io_error:
1738         kunmap(page);
1739         page_cache_release(page);
1740         return rc;
1741 }
1742
1743 static int cifs_readpage(struct file *file, struct page *page)
1744 {
1745         loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1746         int rc = -EACCES;
1747         int xid;
1748
1749         xid = GetXid();
1750
1751         if (file->private_data == NULL) {
1752                 FreeXid(xid);
1753                 return -EBADF;
1754         }
1755
1756         cFYI(1, ("readpage %p at offset %d 0x%x\n",
1757                  page, (int)offset, (int)offset));
1758
1759         rc = cifs_readpage_worker(file, page, &offset);
1760
1761         unlock_page(page);
1762
1763         FreeXid(xid);
1764         return rc;
1765 }
1766
1767 /* We do not want to update the file size from server for inodes
1768    open for write - to avoid races with writepage extending
1769    the file - in the future we could consider allowing
1770    refreshing the inode only on increases in the file size
1771    but this is tricky to do without racing with writebehind
1772    page caching in the current Linux kernel design */
1773 int is_size_safe_to_change(struct cifsInodeInfo *cifsInode)
1774 {
1775         if (cifsInode && find_writable_file(cifsInode))
1776                 return 0;
1777         else
1778                 return 1;
1779 }
1780
1781 static int cifs_prepare_write(struct file *file, struct page *page,
1782         unsigned from, unsigned to)
1783 {
1784         int rc = 0;
1785         loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1786         cFYI(1, ("prepare write for page %p from %d to %d",page,from,to));
1787         if (!PageUptodate(page)) {
1788         /*      if (to - from != PAGE_CACHE_SIZE) {
1789                         void *kaddr = kmap_atomic(page, KM_USER0);
1790                         memset(kaddr, 0, from);
1791                         memset(kaddr + to, 0, PAGE_CACHE_SIZE - to);
1792                         flush_dcache_page(page);
1793                         kunmap_atomic(kaddr, KM_USER0);
1794                 } */
1795                 /* If we are writing a full page it will be up to date,
1796                    no need to read from the server */
1797                 if ((to == PAGE_CACHE_SIZE) && (from == 0))
1798                         SetPageUptodate(page);
1799
1800                 /* might as well read a page, it is fast enough */
1801                 if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
1802                         rc = cifs_readpage_worker(file, page, &offset);
1803                 } else {
1804                 /* should we try using another file handle if there is one -
1805                    how would we lock it to prevent close of that handle
1806                    racing with this read?
1807                    In any case this will be written out by commit_write */
1808                 }
1809         }
1810
1811         /* BB should we pass any errors back?
1812            e.g. if we do not have read access to the file */
1813         return 0;
1814 }
1815
1816 struct address_space_operations cifs_addr_ops = {
1817         .readpage = cifs_readpage,
1818         .readpages = cifs_readpages,
1819         .writepage = cifs_writepage,
1820 #ifdef CONFIG_CIFS_EXPERIMENTAL
1821         .writepages = cifs_writepages,
1822 #endif
1823         .prepare_write = cifs_prepare_write,
1824         .commit_write = cifs_commit_write,
1825         .set_page_dirty = __set_page_dirty_nobuffers,
1826         /* .sync_page = cifs_sync_page, */
1827         /* .direct_IO = */
1828 };