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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((size_t)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 struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
 911 {
 912         struct cifsFileInfo *open_file;
 913         int rc;
 914
 915         read_lock(&GlobalSMBSeslock);
 916         list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
 917                 if (open_file->closePend)
 918                         continue;
 919                 if (open_file->pfile &&
 920                     ((open_file->pfile->f_flags & O_RDWR) ||
 921                      (open_file->pfile->f_flags & O_WRONLY))) {
 922                         read_unlock(&GlobalSMBSeslock);
 923                         if((open_file->invalidHandle) &&
 924                            (!open_file->closePend)) {
 925                                 rc = cifs_reopen_file(&cifs_inode->vfs_inode,
 926                                                       open_file->pfile, FALSE);
 927                                 /* if it fails, try another handle - might be */
 928                                 /* dangerous to hold up writepages with retry */
 929                                 if(rc) {
 930                                         cFYI(1,("failed on reopen file in wp"));
 931                                         read_lock(&GlobalSMBSeslock);
 932                                         continue;
 933                                 }
 934                         }
 935                         return open_file;
 936                 }
 937         }
 938         read_unlock(&GlobalSMBSeslock);
 939         return NULL;
 940 }
 941
 942 static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
 943 {
 944         struct address_space *mapping = page->mapping;
 945         loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
 946         char *write_data;
 947         int rc = -EFAULT;
 948         int bytes_written = 0;
 949         struct cifs_sb_info *cifs_sb;
 950         struct cifsTconInfo *pTcon;
 951         struct inode *inode;
 952         struct cifsFileInfo *open_file;
 953
 954         if (!mapping || !mapping->host)
 955                 return -EFAULT;
 956
 957         inode = page->mapping->host;
 958         cifs_sb = CIFS_SB(inode->i_sb);
 959         pTcon = cifs_sb->tcon;
 960
 961         offset += (loff_t)from;
 962         write_data = kmap(page);
 963         write_data += from;
 964
 965         if ((to > PAGE_CACHE_SIZE) || (from > to)) {
 966                 kunmap(page);
 967                 return -EIO;
 968         }
 969
 970         /* racing with truncate? */
 971         if (offset > mapping->host->i_size) {
 972                 kunmap(page);
 973                 return 0; /* don't care */
 974         }
 975
 976         /* check to make sure that we are not extending the file */
 977         if (mapping->host->i_size - offset < (loff_t)to)
 978                 to = (unsigned)(mapping->host->i_size - offset);
 979
 980         open_file = find_writable_file(CIFS_I(mapping->host));
 981         if (open_file) {
 982                 bytes_written = cifs_write(open_file->pfile, write_data,
 983                                            to-from, &offset);
 984                 /* Does mm or vfs already set times? */
 985                 inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
 986                 if ((bytes_written > 0) && (offset)) {
 987                         rc = 0;
 988                 } else if (bytes_written < 0) {
 989                         if (rc != -EBADF)
 990                                 rc = bytes_written;
 991                 }
 992         } else {
 993                 cFYI(1, ("No writeable filehandles for inode"));
 994                 rc = -EIO;
 995         }
 996
 997         kunmap(page);
 998         return rc;
 999 }
1000
1001 #ifdef CONFIG_CIFS_EXPERIMENTAL
1002 static int cifs_writepages(struct address_space *mapping,
1003                            struct writeback_control *wbc)
1004 {
1005         struct backing_dev_info *bdi = mapping->backing_dev_info;
1006         unsigned int bytes_to_write;
1007         unsigned int bytes_written;
1008         struct cifs_sb_info *cifs_sb;
1009         int done = 0;
1010         pgoff_t end = -1;
1011         pgoff_t index;
1012         int is_range = 0;
1013         struct kvec iov[32];
1014         int n_iov = 0;
1015         pgoff_t next;
1016         int nr_pages;
1017         __u64 offset = 0;
1018         struct cifsFileInfo *open_file = NULL;
1019         struct page *page;
1020         struct pagevec pvec;
1021         int rc = 0;
1022         int scanned = 0;
1023         int xid;
1024
1025         cifs_sb = CIFS_SB(mapping->host->i_sb);
1026
1027         /*
1028          * If wsize is smaller that the page cache size, default to writing
1029          * one page at a time via cifs_writepage
1030          */
1031         if (cifs_sb->wsize < PAGE_CACHE_SIZE)
1032                 return generic_writepages(mapping, wbc);
1033
1034         /* BB FIXME we do not have code to sign across multiple buffers yet,
1035            so go to older writepage style write which we can sign if needed */
1036         if((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server))
1037                 if(cifs_sb->tcon->ses->server->secMode &
1038                           (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
1039                         return generic_writepages(mapping, wbc);
1040
1041         /*
1042          * BB: Is this meaningful for a non-block-device file system?
1043          * If it is, we should test it again after we do I/O
1044          */
1045         if (wbc->nonblocking && bdi_write_congested(bdi)) {
1046                 wbc->encountered_congestion = 1;
1047                 return 0;
1048         }
1049
1050         xid = GetXid();
1051
1052         pagevec_init(&pvec, 0);
1053         if (wbc->sync_mode == WB_SYNC_NONE)
1054                 index = mapping->writeback_index; /* Start from prev offset */
1055         else {
1056                 index = 0;
1057                 scanned = 1;
1058         }
1059         if (wbc->start || wbc->end) {
1060                 index = wbc->start >> PAGE_CACHE_SHIFT;
1061                 end = wbc->end >> PAGE_CACHE_SHIFT;
1062                 is_range = 1;
1063                 scanned = 1;
1064         }
1065 retry:
1066         while (!done && (index <= end) &&
1067                (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
1068                         PAGECACHE_TAG_DIRTY,
1069                         min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) {
1070                 int first;
1071                 unsigned int i;
1072
1073                 if (!open_file) {
1074                         open_file = find_writable_file(CIFS_I(mapping->host));
1075                         if (!open_file) {
1076                                 pagevec_release(&pvec);
1077                                 cERROR(1, ("No writable handles for inode"));
1078                                 return -EIO;
1079                         }
1080                 }
1081
1082                 first = -1;
1083                 next = 0;
1084                 n_iov = 0;
1085                 bytes_to_write = 0;
1086
1087                 for (i = 0; i < nr_pages; i++) {
1088                         page = pvec.pages[i];
1089                         /*
1090                          * At this point we hold neither mapping->tree_lock nor
1091                          * lock on the page itself: the page may be truncated or
1092                          * invalidated (changing page->mapping to NULL), or even
1093                          * swizzled back from swapper_space to tmpfs file
1094                          * mapping
1095                          */
1096
1097                         if (first < 0)
1098                                 lock_page(page);
1099                         else if (TestSetPageLocked(page))
1100                                 break;
1101
1102                         if (unlikely(page->mapping != mapping)) {
1103                                 unlock_page(page);
1104                                 break;
1105                         }
1106
1107                         if (unlikely(is_range) && (page->index > end)) {
1108                                 done = 1;
1109                                 unlock_page(page);
1110                                 break;
1111                         }
1112
1113                         if (next && (page->index != next)) {
1114                                 /* Not next consecutive page */
1115                                 unlock_page(page);
1116                                 break;
1117                         }
1118
1119                         if (wbc->sync_mode != WB_SYNC_NONE)
1120                                 wait_on_page_writeback(page);
1121
1122                         if (PageWriteback(page) ||
1123                                         !test_clear_page_dirty(page)) {
1124                                 unlock_page(page);
1125                                 break;
1126                         }
1127                         /*
1128                          * BB can we get rid of this?  pages are held by pvec
1129                          */
1130                         page_cache_get(page);
1131
1132                         /* reserve iov[0] for the smb header */
1133                         n_iov++;
1134                         iov[n_iov].iov_base = kmap(page);
1135                         iov[n_iov].iov_len = PAGE_CACHE_SIZE;
1136                         bytes_to_write += PAGE_CACHE_SIZE;
1137
1138                         if (first < 0) {
1139                                 first = i;
1140                                 offset = page_offset(page);
1141                         }
1142                         next = page->index + 1;
1143                         if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize)
1144                                 break;
1145                 }
1146                 if (n_iov) {
1147                         rc = CIFSSMBWrite2(xid, cifs_sb->tcon,
1148                                            open_file->netfid, bytes_to_write,
1149                                            offset, &bytes_written, iov, n_iov,
1150                                            1);
1151                         if (rc || bytes_written < bytes_to_write) {
1152                                 cERROR(1,("CIFSSMBWrite2 returned %d, written = %x",
1153                                           rc, bytes_written));
1154                                 set_bit(AS_EIO, &mapping->flags);
1155                                 SetPageError(page);
1156                         }
1157                         for (i = 0; i < n_iov; i++) {
1158                                 page = pvec.pages[first + i];
1159                                 kunmap(page);
1160                                 unlock_page(page);
1161                                 page_cache_release(page);
1162                         }
1163                         if ((wbc->nr_to_write -= n_iov) <= 0)
1164                                 done = 1;
1165                         index = next;
1166                 }
1167                 pagevec_release(&pvec);
1168         }
1169         if (!scanned && !done) {
1170                 /*
1171                  * We hit the last page and there is more work to be done: wrap
1172                  * back to the start of the file
1173                  */
1174                 scanned = 1;
1175                 index = 0;
1176                 goto retry;
1177         }
1178         if (!is_range)
1179                 mapping->writeback_index = index;
1180
1181         FreeXid(xid);
1182
1183         return rc;
1184 }
1185 #endif
1186
1187 static int cifs_writepage(struct page* page, struct writeback_control *wbc)
1188 {
1189         int rc = -EFAULT;
1190         int xid;
1191
1192         xid = GetXid();
1193 /* BB add check for wbc flags */
1194         page_cache_get(page);
1195         if (!PageUptodate(page)) {
1196                 cFYI(1, ("ppw - page not up to date"));
1197         }
1198
1199         rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
1200         SetPageUptodate(page); /* BB add check for error and Clearuptodate? */
1201         unlock_page(page);
1202         page_cache_release(page);
1203         FreeXid(xid);
1204         return rc;
1205 }
1206
1207 static int cifs_commit_write(struct file *file, struct page *page,
1208         unsigned offset, unsigned to)
1209 {
1210         int xid;
1211         int rc = 0;
1212         struct inode *inode = page->mapping->host;
1213         loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
1214         char *page_data;
1215
1216         xid = GetXid();
1217         cFYI(1, ("commit write for page %p up to position %lld for %d",
1218                  page, position, to));
1219         if (position > inode->i_size) {
1220                 i_size_write(inode, position);
1221                 /* if (file->private_data == NULL) {
1222                         rc = -EBADF;
1223                 } else {
1224                         open_file = (struct cifsFileInfo *)file->private_data;
1225                         cifs_sb = CIFS_SB(inode->i_sb);
1226                         rc = -EAGAIN;
1227                         while (rc == -EAGAIN) {
1228                                 if ((open_file->invalidHandle) &&
1229                                     (!open_file->closePend)) {
1230                                         rc = cifs_reopen_file(
1231                                                 file->f_dentry->d_inode, file);
1232                                         if (rc != 0)
1233                                                 break;
1234                                 }
1235                                 if (!open_file->closePend) {
1236                                         rc = CIFSSMBSetFileSize(xid,
1237                                                 cifs_sb->tcon, position,
1238                                                 open_file->netfid,
1239                                                 open_file->pid, FALSE);
1240                                 } else {
1241                                         rc = -EBADF;
1242                                         break;
1243                                 }
1244                         }
1245                         cFYI(1, (" SetEOF (commit write) rc = %d", rc));
1246                 } */
1247         }
1248         if (!PageUptodate(page)) {
1249                 position =  ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset;
1250                 /* can not rely on (or let) writepage write this data */
1251                 if (to < offset) {
1252                         cFYI(1, ("Illegal offsets, can not copy from %d to %d",
1253                                 offset, to));
1254                         FreeXid(xid);
1255                         return rc;
1256                 }
1257                 /* this is probably better than directly calling
1258                    partialpage_write since in this function the file handle is
1259                    known which we might as well leverage */
1260                 /* BB check if anything else missing out of ppw
1261                    such as updating last write time */
1262                 page_data = kmap(page);
1263                 rc = cifs_write(file, page_data + offset, to-offset,
1264                                 &position);
1265                 if (rc > 0)
1266                         rc = 0;
1267                 /* else if (rc < 0) should we set writebehind rc? */
1268                 kunmap(page);
1269         } else {
1270                 set_page_dirty(page);
1271         }
1272
1273         FreeXid(xid);
1274         return rc;
1275 }
1276
1277 int cifs_fsync(struct file *file, struct dentry *dentry, int datasync)
1278 {
1279         int xid;
1280         int rc = 0;
1281         struct inode *inode = file->f_dentry->d_inode;
1282
1283         xid = GetXid();
1284
1285         cFYI(1, ("Sync file - name: %s datasync: 0x%x ",
1286                 dentry->d_name.name, datasync));
1287
1288         rc = filemap_fdatawrite(inode->i_mapping);
1289         if (rc == 0)
1290                 CIFS_I(inode)->write_behind_rc = 0;
1291         FreeXid(xid);
1292         return rc;
1293 }
1294
1295 /* static int cifs_sync_page(struct page *page)
1296 {
1297         struct address_space *mapping;
1298         struct inode *inode;
1299         unsigned long index = page->index;
1300         unsigned int rpages = 0;
1301         int rc = 0;
1302
1303         cFYI(1, ("sync page %p",page));
1304         mapping = page->mapping;
1305         if (!mapping)
1306                 return 0;
1307         inode = mapping->host;
1308         if (!inode)
1309                 return 0; */
1310
1311 /*      fill in rpages then
1312         result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */
1313
1314 /*      cFYI(1, ("rpages is %d for sync page of Index %ld ", rpages, index));
1315
1316         if (rc < 0)
1317                 return rc;
1318         return 0;
1319 } */
1320
1321 /*
1322  * As file closes, flush all cached write data for this inode checking
1323  * for write behind errors.
1324  */
1325 int cifs_flush(struct file *file)
1326 {
1327         struct inode * inode = file->f_dentry->d_inode;
1328         int rc = 0;
1329
1330         /* Rather than do the steps manually:
1331            lock the inode for writing
1332            loop through pages looking for write behind data (dirty pages)
1333            coalesce into contiguous 16K (or smaller) chunks to write to server
1334            send to server (prefer in parallel)
1335            deal with writebehind errors
1336            unlock inode for writing
1337            filemapfdatawrite appears easier for the time being */
1338
1339         rc = filemap_fdatawrite(inode->i_mapping);
1340         if (!rc) /* reset wb rc if we were able to write out dirty pages */
1341                 CIFS_I(inode)->write_behind_rc = 0;
1342
1343         cFYI(1, ("Flush inode %p file %p rc %d",inode,file,rc));
1344
1345         return rc;
1346 }
1347
1348 ssize_t cifs_user_read(struct file *file, char __user *read_data,
1349         size_t read_size, loff_t *poffset)
1350 {
1351         int rc = -EACCES;
1352         unsigned int bytes_read = 0;
1353         unsigned int total_read = 0;
1354         unsigned int current_read_size;
1355         struct cifs_sb_info *cifs_sb;
1356         struct cifsTconInfo *pTcon;
1357         int xid;
1358         struct cifsFileInfo *open_file;
1359         char *smb_read_data;
1360         char __user *current_offset;
1361         struct smb_com_read_rsp *pSMBr;
1362
1363         xid = GetXid();
1364         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
1365         pTcon = cifs_sb->tcon;
1366
1367         if (file->private_data == NULL) {
1368                 FreeXid(xid);
1369                 return -EBADF;
1370         }
1371         open_file = (struct cifsFileInfo *)file->private_data;
1372
1373         if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
1374                 cFYI(1, ("attempting read on write only file instance"));
1375         }
1376         for (total_read = 0, current_offset = read_data;
1377              read_size > total_read;
1378              total_read += bytes_read, current_offset += bytes_read) {
1379                 current_read_size = min_t(const int, read_size - total_read,
1380                                           cifs_sb->rsize);
1381                 rc = -EAGAIN;
1382                 smb_read_data = NULL;
1383                 while (rc == -EAGAIN) {
1384                         if ((open_file->invalidHandle) &&
1385                             (!open_file->closePend)) {
1386                                 rc = cifs_reopen_file(file->f_dentry->d_inode,
1387                                         file, TRUE);
1388                                 if (rc != 0)
1389                                         break;
1390                         }
1391                         rc = CIFSSMBRead(xid, pTcon,
1392                                         open_file->netfid,
1393                                         current_read_size, *poffset,
1394                                         &bytes_read, &smb_read_data);
1395                         pSMBr = (struct smb_com_read_rsp *)smb_read_data;
1396                         if (copy_to_user(current_offset,
1397                                          smb_read_data + 4 /* RFC1001 hdr */
1398                                          + le16_to_cpu(pSMBr->DataOffset),
1399                                          bytes_read)) {
1400                                 rc = -EFAULT;
1401                                 FreeXid(xid);
1402                                 return rc;
1403             }
1404                         if (smb_read_data) {
1405                                 cifs_buf_release(smb_read_data);
1406                                 smb_read_data = NULL;
1407                         }
1408                 }
1409                 if (rc || (bytes_read == 0)) {
1410                         if (total_read) {
1411                                 break;
1412                         } else {
1413                                 FreeXid(xid);
1414                                 return rc;
1415                         }
1416                 } else {
1417                         cifs_stats_bytes_read(pTcon, bytes_read);
1418                         *poffset += bytes_read;
1419                 }
1420         }
1421         FreeXid(xid);
1422         return total_read;
1423 }
1424
1425
1426 static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
1427         loff_t *poffset)
1428 {
1429         int rc = -EACCES;
1430         unsigned int bytes_read = 0;
1431         unsigned int total_read;
1432         unsigned int current_read_size;
1433         struct cifs_sb_info *cifs_sb;
1434         struct cifsTconInfo *pTcon;
1435         int xid;
1436         char *current_offset;
1437         struct cifsFileInfo *open_file;
1438
1439         xid = GetXid();
1440         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
1441         pTcon = cifs_sb->tcon;
1442
1443         if (file->private_data == NULL) {
1444                 FreeXid(xid);
1445                 return -EBADF;
1446         }
1447         open_file = (struct cifsFileInfo *)file->private_data;
1448
1449         if ((file->f_flags & O_ACCMODE) == O_WRONLY)
1450                 cFYI(1, ("attempting read on write only file instance"));
1451
1452         for (total_read = 0, current_offset = read_data;
1453              read_size > total_read;
1454              total_read += bytes_read, current_offset += bytes_read) {
1455                 current_read_size = min_t(const int, read_size - total_read,
1456                                           cifs_sb->rsize);
1457                 /* For windows me and 9x we do not want to request more
1458                 than it negotiated since it will refuse the read then */
1459                 if((pTcon->ses) &&
1460                         !(pTcon->ses->capabilities & CAP_LARGE_FILES)) {
1461                         current_read_size = min_t(const int, current_read_size,
1462                                         pTcon->ses->server->maxBuf - 128);
1463                 }
1464                 rc = -EAGAIN;
1465                 while (rc == -EAGAIN) {
1466                         if ((open_file->invalidHandle) &&
1467                             (!open_file->closePend)) {
1468                                 rc = cifs_reopen_file(file->f_dentry->d_inode,
1469                                         file, TRUE);
1470                                 if (rc != 0)
1471                                         break;
1472                         }
1473                         rc = CIFSSMBRead(xid, pTcon,
1474                                         open_file->netfid,
1475                                         current_read_size, *poffset,
1476                                         &bytes_read, &current_offset);
1477                 }
1478                 if (rc || (bytes_read == 0)) {
1479                         if (total_read) {
1480                                 break;
1481                         } else {
1482                                 FreeXid(xid);
1483                                 return rc;
1484                         }
1485                 } else {
1486                         cifs_stats_bytes_read(pTcon, total_read);
1487                         *poffset += bytes_read;
1488                 }
1489         }
1490         FreeXid(xid);
1491         return total_read;
1492 }
1493
1494 int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
1495 {
1496         struct dentry *dentry = file->f_dentry;
1497         int rc, xid;
1498
1499         xid = GetXid();
1500         rc = cifs_revalidate(dentry);
1501         if (rc) {
1502                 cFYI(1, ("Validation prior to mmap failed, error=%d", rc));
1503                 FreeXid(xid);
1504                 return rc;
1505         }
1506         rc = generic_file_mmap(file, vma);
1507         FreeXid(xid);
1508         return rc;
1509 }
1510
1511
1512 static void cifs_copy_cache_pages(struct address_space *mapping,
1513         struct list_head *pages, int bytes_read, char *data,
1514         struct pagevec *plru_pvec)
1515 {
1516         struct page *page;
1517         char *target;
1518
1519         while (bytes_read > 0) {
1520                 if (list_empty(pages))
1521                         break;
1522
1523                 page = list_entry(pages->prev, struct page, lru);
1524                 list_del(&page->lru);
1525
1526                 if (add_to_page_cache(page, mapping, page->index,
1527                                       GFP_KERNEL)) {
1528                         page_cache_release(page);
1529                         cFYI(1, ("Add page cache failed"));
1530                         data += PAGE_CACHE_SIZE;
1531                         bytes_read -= PAGE_CACHE_SIZE;
1532                         continue;
1533                 }
1534
1535                 target = kmap_atomic(page,KM_USER0);
1536
1537                 if (PAGE_CACHE_SIZE > bytes_read) {
1538                         memcpy(target, data, bytes_read);
1539                         /* zero the tail end of this partial page */
1540                         memset(target + bytes_read, 0,
1541                                PAGE_CACHE_SIZE - bytes_read);
1542                         bytes_read = 0;
1543                 } else {
1544                         memcpy(target, data, PAGE_CACHE_SIZE);
1545                         bytes_read -= PAGE_CACHE_SIZE;
1546                 }
1547                 kunmap_atomic(target, KM_USER0);
1548
1549                 flush_dcache_page(page);
1550                 SetPageUptodate(page);
1551                 unlock_page(page);
1552                 if (!pagevec_add(plru_pvec, page))
1553                         __pagevec_lru_add(plru_pvec);
1554                 data += PAGE_CACHE_SIZE;
1555         }
1556         return;
1557 }
1558
1559 static int cifs_readpages(struct file *file, struct address_space *mapping,
1560         struct list_head *page_list, unsigned num_pages)
1561 {
1562         int rc = -EACCES;
1563         int xid;
1564         loff_t offset;
1565         struct page *page;
1566         struct cifs_sb_info *cifs_sb;
1567         struct cifsTconInfo *pTcon;
1568         int bytes_read = 0;
1569         unsigned int read_size,i;
1570         char *smb_read_data = NULL;
1571         struct smb_com_read_rsp *pSMBr;
1572         struct pagevec lru_pvec;
1573         struct cifsFileInfo *open_file;
1574
1575         xid = GetXid();
1576         if (file->private_data == NULL) {
1577                 FreeXid(xid);
1578                 return -EBADF;
1579         }
1580         open_file = (struct cifsFileInfo *)file->private_data;
1581         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
1582         pTcon = cifs_sb->tcon;
1583
1584         pagevec_init(&lru_pvec, 0);
1585
1586         for (i = 0; i < num_pages; ) {
1587                 unsigned contig_pages;
1588                 struct page *tmp_page;
1589                 unsigned long expected_index;
1590
1591                 if (list_empty(page_list))
1592                         break;
1593
1594                 page = list_entry(page_list->prev, struct page, lru);
1595                 offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1596
1597                 /* count adjacent pages that we will read into */
1598                 contig_pages = 0;
1599                 expected_index =
1600                         list_entry(page_list->prev, struct page, lru)->index;
1601                 list_for_each_entry_reverse(tmp_page,page_list,lru) {
1602                         if (tmp_page->index == expected_index) {
1603                                 contig_pages++;
1604                                 expected_index++;
1605                         } else
1606                                 break;
1607                 }
1608                 if (contig_pages + i >  num_pages)
1609                         contig_pages = num_pages - i;
1610
1611                 /* for reads over a certain size could initiate async
1612                    read ahead */
1613
1614                 read_size = contig_pages * PAGE_CACHE_SIZE;
1615                 /* Read size needs to be in multiples of one page */
1616                 read_size = min_t(const unsigned int, read_size,
1617                                   cifs_sb->rsize & PAGE_CACHE_MASK);
1618
1619                 rc = -EAGAIN;
1620                 while (rc == -EAGAIN) {
1621                         if ((open_file->invalidHandle) &&
1622                             (!open_file->closePend)) {
1623                                 rc = cifs_reopen_file(file->f_dentry->d_inode,
1624                                         file, TRUE);
1625                                 if (rc != 0)
1626                                         break;
1627                         }
1628
1629                         rc = CIFSSMBRead(xid, pTcon,
1630                                         open_file->netfid,
1631                                         read_size, offset,
1632                                         &bytes_read, &smb_read_data);
1633
1634                         /* BB more RC checks ? */
1635                         if (rc== -EAGAIN) {
1636                                 if (smb_read_data) {
1637                                         cifs_buf_release(smb_read_data);
1638                                         smb_read_data = NULL;
1639                                 }
1640                         }
1641                 }
1642                 if ((rc < 0) || (smb_read_data == NULL)) {
1643                         cFYI(1, ("Read error in readpages: %d", rc));
1644                         /* clean up remaing pages off list */
1645                         while (!list_empty(page_list) && (i < num_pages)) {
1646                                 page = list_entry(page_list->prev, struct page,
1647                                                   lru);
1648                                 list_del(&page->lru);
1649                                 page_cache_release(page);
1650                         }
1651                         break;
1652                 } else if (bytes_read > 0) {
1653                         pSMBr = (struct smb_com_read_rsp *)smb_read_data;
1654                         cifs_copy_cache_pages(mapping, page_list, bytes_read,
1655                                 smb_read_data + 4 /* RFC1001 hdr */ +
1656                                 le16_to_cpu(pSMBr->DataOffset), &lru_pvec);
1657
1658                         i +=  bytes_read >> PAGE_CACHE_SHIFT;
1659                         cifs_stats_bytes_read(pTcon, bytes_read);
1660                         if ((int)(bytes_read & PAGE_CACHE_MASK) != bytes_read) {
1661                                 i++; /* account for partial page */
1662
1663                                 /* server copy of file can have smaller size
1664                                    than client */
1665                                 /* BB do we need to verify this common case ?
1666                                    this case is ok - if we are at server EOF
1667                                    we will hit it on next read */
1668
1669                         /* while (!list_empty(page_list) && (i < num_pages)) {
1670                                         page = list_entry(page_list->prev,
1671                                                           struct page, list);
1672                                         list_del(&page->list);
1673                                         page_cache_release(page);
1674                                 }
1675                                 break; */
1676                         }
1677                 } else {
1678                         cFYI(1, ("No bytes read (%d) at offset %lld . "
1679                                  "Cleaning remaining pages from readahead list",
1680                                  bytes_read, offset));
1681                         /* BB turn off caching and do new lookup on
1682                            file size at server? */
1683                         while (!list_empty(page_list) && (i < num_pages)) {
1684                                 page = list_entry(page_list->prev, struct page,
1685                                                   lru);
1686                                 list_del(&page->lru);
1687
1688                                 /* BB removeme - replace with zero of page? */
1689                                 page_cache_release(page);
1690                         }
1691                         break;
1692                 }
1693                 if (smb_read_data) {
1694                         cifs_buf_release(smb_read_data);
1695                         smb_read_data = NULL;
1696                 }
1697                 bytes_read = 0;
1698         }
1699
1700         pagevec_lru_add(&lru_pvec);
1701
1702 /* need to free smb_read_data buf before exit */
1703         if (smb_read_data) {
1704                 cifs_buf_release(smb_read_data);
1705                 smb_read_data = NULL;
1706         }
1707
1708         FreeXid(xid);
1709         return rc;
1710 }
1711
1712 static int cifs_readpage_worker(struct file *file, struct page *page,
1713         loff_t *poffset)
1714 {
1715         char *read_data;
1716         int rc;
1717
1718         page_cache_get(page);
1719         read_data = kmap(page);
1720         /* for reads over a certain size could initiate async read ahead */
1721
1722         rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
1723
1724         if (rc < 0)
1725                 goto io_error;
1726         else
1727                 cFYI(1, ("Bytes read %d ",rc));
1728
1729         file->f_dentry->d_inode->i_atime =
1730                 current_fs_time(file->f_dentry->d_inode->i_sb);
1731
1732         if (PAGE_CACHE_SIZE > rc)
1733                 memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);
1734
1735         flush_dcache_page(page);
1736         SetPageUptodate(page);
1737         rc = 0;
1738
1739 io_error:
1740         kunmap(page);
1741         page_cache_release(page);
1742         return rc;
1743 }
1744
1745 static int cifs_readpage(struct file *file, struct page *page)
1746 {
1747         loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1748         int rc = -EACCES;
1749         int xid;
1750
1751         xid = GetXid();
1752
1753         if (file->private_data == NULL) {
1754                 FreeXid(xid);
1755                 return -EBADF;
1756         }
1757
1758         cFYI(1, ("readpage %p at offset %d 0x%x\n",
1759                  page, (int)offset, (int)offset));
1760
1761         rc = cifs_readpage_worker(file, page, &offset);
1762
1763         unlock_page(page);
1764
1765         FreeXid(xid);
1766         return rc;
1767 }
1768
1769 /* We do not want to update the file size from server for inodes
1770    open for write - to avoid races with writepage extending
1771    the file - in the future we could consider allowing
1772    refreshing the inode only on increases in the file size
1773    but this is tricky to do without racing with writebehind
1774    page caching in the current Linux kernel design */
1775 int is_size_safe_to_change(struct cifsInodeInfo *cifsInode)
1776 {
1777         if (cifsInode && find_writable_file(cifsInode))
1778                 return 0;
1779         else
1780                 return 1;
1781 }
1782
1783 static int cifs_prepare_write(struct file *file, struct page *page,
1784         unsigned from, unsigned to)
1785 {
1786         int rc = 0;
1787         loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1788         cFYI(1, ("prepare write for page %p from %d to %d",page,from,to));
1789         if (!PageUptodate(page)) {
1790         /*      if (to - from != PAGE_CACHE_SIZE) {
1791                         void *kaddr = kmap_atomic(page, KM_USER0);
1792                         memset(kaddr, 0, from);
1793                         memset(kaddr + to, 0, PAGE_CACHE_SIZE - to);
1794                         flush_dcache_page(page);
1795                         kunmap_atomic(kaddr, KM_USER0);
1796                 } */
1797                 /* If we are writing a full page it will be up to date,
1798                    no need to read from the server */
1799                 if ((to == PAGE_CACHE_SIZE) && (from == 0))
1800                         SetPageUptodate(page);
1801
1802                 /* might as well read a page, it is fast enough */
1803                 if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
1804                         rc = cifs_readpage_worker(file, page, &offset);
1805                 } else {
1806                 /* should we try using another file handle if there is one -
1807                    how would we lock it to prevent close of that handle
1808                    racing with this read?
1809                    In any case this will be written out by commit_write */
1810                 }
1811         }
1812
1813         /* BB should we pass any errors back?
1814            e.g. if we do not have read access to the file */
1815         return 0;
1816 }
1817
1818 struct address_space_operations cifs_addr_ops = {
1819         .readpage = cifs_readpage,
1820         .readpages = cifs_readpages,
1821         .writepage = cifs_writepage,
1822 #ifdef CONFIG_CIFS_EXPERIMENTAL
1823         .writepages = cifs_writepages,
1824 #endif
1825         .prepare_write = cifs_prepare_write,
1826         .commit_write = cifs_commit_write,
1827         .set_page_dirty = __set_page_dirty_nobuffers,
1828         /* .sync_page = cifs_sync_page, */
1829         /* .direct_IO = */
1830 };