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   1 /*
   2  *   fs/cifs/inode.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2005
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21 #include <linux/fs.h>
  22 #include <linux/buffer_head.h>
  23 #include <linux/stat.h>
  24 #include <linux/pagemap.h>
  25 #include <asm/div64.h>
  26 #include "cifsfs.h"
  27 #include "cifspdu.h"
  28 #include "cifsglob.h"
  29 #include "cifsproto.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_fs_sb.h"
  32
  33 int cifs_get_inode_info_unix(struct inode **pinode,
  34         const unsigned char *search_path, struct super_block *sb, int xid)
  35 {
  36         int rc = 0;
  37         FILE_UNIX_BASIC_INFO findData;
  38         struct cifsTconInfo *pTcon;
  39         struct inode *inode;
  40         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
  41         char *tmp_path;
  42
  43         pTcon = cifs_sb->tcon;
  44         cFYI(1, ("Getting info on %s ", search_path));
  45         /* could have done a find first instead but this returns more info */
  46         rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
  47                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
  48                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
  49 /*      dump_mem("\nUnixQPathInfo return data", &findData,
  50                  sizeof(findData)); */
  51         if (rc) {
  52                 if (rc == -EREMOTE) {
  53                         tmp_path =
  54                             kmalloc(strnlen(pTcon->treeName,
  55                                             MAX_TREE_SIZE + 1) +
  56                                     strnlen(search_path, MAX_PATHCONF) + 1,
  57                                     GFP_KERNEL);
  58                         if (tmp_path == NULL) {
  59                                 return -ENOMEM;
  60                         }
  61                         /* have to skip first of the double backslash of
  62                            UNC name */
  63                         strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
  64                         strncat(tmp_path, search_path, MAX_PATHCONF);
  65                         rc = connect_to_dfs_path(xid, pTcon->ses,
  66                                                  /* treename + */ tmp_path,
  67                                                  cifs_sb->local_nls,
  68                                                  cifs_sb->mnt_cifs_flags &
  69                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
  70                         kfree(tmp_path);
  71
  72                         /* BB fix up inode etc. */
  73                 } else if (rc) {
  74                         return rc;
  75                 }
  76         } else {
  77                 struct cifsInodeInfo *cifsInfo;
  78                 __u32 type = le32_to_cpu(findData.Type);
  79                 __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
  80                 __u64 end_of_file = le64_to_cpu(findData.EndOfFile);
  81
  82                 /* get new inode */
  83                 if (*pinode == NULL) {
  84                         *pinode = new_inode(sb);
  85                         if (*pinode == NULL)
  86                                 return -ENOMEM;
  87                         /* Is an i_ino of zero legal? */
  88                         /* Are there sanity checks we can use to ensure that
  89                            the server is really filling in that field? */
  90                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
  91                                 (*pinode)->i_ino =
  92                                         (unsigned long)findData.UniqueId;
  93                         } /* note ino incremented to unique num in new_inode */
  94                         insert_inode_hash(*pinode);
  95                 }
  96
  97                 inode = *pinode;
  98                 cifsInfo = CIFS_I(inode);
  99
 100                 cFYI(1, ("Old time %ld ", cifsInfo->time));
 101                 cifsInfo->time = jiffies;
 102                 cFYI(1, ("New time %ld ", cifsInfo->time));
 103                 /* this is ok to set on every inode revalidate */
 104                 atomic_set(&cifsInfo->inUse,1);
 105
 106                 inode->i_atime =
 107                     cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime));
 108                 inode->i_mtime =
 109                     cifs_NTtimeToUnix(le64_to_cpu
 110                                 (findData.LastModificationTime));
 111                 inode->i_ctime =
 112                     cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange));
 113                 inode->i_mode = le64_to_cpu(findData.Permissions);
 114                 /* since we set the inode type below we need to mask off
 115                    to avoid strange results if bits set above */
 116                         inode->i_mode &= ~S_IFMT;
 117                 if (type == UNIX_FILE) {
 118                         inode->i_mode |= S_IFREG;
 119                 } else if (type == UNIX_SYMLINK) {
 120                         inode->i_mode |= S_IFLNK;
 121                 } else if (type == UNIX_DIR) {
 122                         inode->i_mode |= S_IFDIR;
 123                 } else if (type == UNIX_CHARDEV) {
 124                         inode->i_mode |= S_IFCHR;
 125                         inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
 126                                 le64_to_cpu(findData.DevMinor) & MINORMASK);
 127                 } else if (type == UNIX_BLOCKDEV) {
 128                         inode->i_mode |= S_IFBLK;
 129                         inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
 130                                 le64_to_cpu(findData.DevMinor) & MINORMASK);
 131                 } else if (type == UNIX_FIFO) {
 132                         inode->i_mode |= S_IFIFO;
 133                 } else if (type == UNIX_SOCKET) {
 134                         inode->i_mode |= S_IFSOCK;
 135                 } else {
 136                         /* safest to call it a file if we do not know */
 137                         inode->i_mode |= S_IFREG;
 138                         cFYI(1,("unknown type %d",type));
 139                 }
 140                 inode->i_uid = le64_to_cpu(findData.Uid);
 141                 inode->i_gid = le64_to_cpu(findData.Gid);
 142                 inode->i_nlink = le64_to_cpu(findData.Nlinks);
 143
 144                 if (is_size_safe_to_change(cifsInfo)) {
 145                 /* can not safely change the file size here if the
 146                    client is writing to it due to potential races */
 147
 148                         i_size_write(inode, end_of_file);
 149
 150                 /* blksize needs to be multiple of two. So safer to default to
 151                 blksize and blkbits set in superblock so 2**blkbits and blksize
 152                 will match rather than setting to:
 153                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 154
 155                 /* This seems incredibly stupid but it turns out that i_blocks
 156                    is not related to (i_size / i_blksize), instead 512 byte size
 157                    is required for calculating num blocks */
 158
 159                 /* 512 bytes (2**9) is the fake blocksize that must be used */
 160                 /* for this calculation */
 161                         inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 162                 }
 163
 164                 if (num_of_bytes < end_of_file)
 165                         cFYI(1, ("allocation size less than end of file"));
 166                 cFYI(1,
 167                      ("Size %ld and blocks %ld",
 168                       (unsigned long) inode->i_size, inode->i_blocks));
 169                 if (S_ISREG(inode->i_mode)) {
 170                         cFYI(1, ("File inode"));
 171                         inode->i_op = &cifs_file_inode_ops;
 172                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 173                                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 174                                         inode->i_fop =
 175                                                 &cifs_file_direct_nobrl_ops;
 176                                 else
 177                                         inode->i_fop = &cifs_file_direct_ops;
 178                         } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 179                                 inode->i_fop = &cifs_file_nobrl_ops;
 180                         else /* not direct, send byte range locks */
 181                                 inode->i_fop = &cifs_file_ops;
 182
 183                         inode->i_data.a_ops = &cifs_addr_ops;
 184                         /* check if server can support readpages */
 185                         if(pTcon->ses->server->maxBuf <
 186                             4096 + MAX_CIFS_HDR_SIZE)
 187                                 inode->i_data.a_ops->readpages = NULL;
 188                 } else if (S_ISDIR(inode->i_mode)) {
 189                         cFYI(1, ("Directory inode"));
 190                         inode->i_op = &cifs_dir_inode_ops;
 191                         inode->i_fop = &cifs_dir_ops;
 192                 } else if (S_ISLNK(inode->i_mode)) {
 193                         cFYI(1, ("Symbolic Link inode"));
 194                         inode->i_op = &cifs_symlink_inode_ops;
 195                 /* tmp_inode->i_fop = */ /* do not need to set to anything */
 196                 } else {
 197                         cFYI(1, ("Init special inode"));
 198                         init_special_inode(inode, inode->i_mode,
 199                                            inode->i_rdev);
 200                 }
 201         }
 202         return rc;
 203 }
 204
 205 static int decode_sfu_inode(struct inode * inode, __u64 size,
 206                             const unsigned char *path,
 207                             struct cifs_sb_info *cifs_sb, int xid)
 208 {
 209         int rc;
 210         int oplock = FALSE;
 211         __u16 netfid;
 212         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 213         char buf[24];
 214         unsigned int bytes_read;
 215         char * pbuf;
 216
 217         pbuf = buf;
 218
 219         if(size == 0) {
 220                 inode->i_mode |= S_IFIFO;
 221                 return 0;
 222         } else if (size < 8) {
 223                 return -EINVAL;  /* EOPNOTSUPP? */
 224         }
 225
 226         rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
 227                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 228                          cifs_sb->local_nls,
 229                          cifs_sb->mnt_cifs_flags &
 230                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 231         if (rc==0) {
 232                         /* Read header */
 233                 rc = CIFSSMBRead(xid, pTcon,
 234                                  netfid,
 235                                  24 /* length */, 0 /* offset */,
 236                                  &bytes_read, &pbuf);
 237                 if((rc == 0) && (bytes_read >= 8)) {
 238                         if(memcmp("IntxBLK", pbuf, 8) == 0) {
 239                                 cFYI(1,("Block device"));
 240                                 inode->i_mode |= S_IFBLK;
 241                                 if(bytes_read == 24) {
 242                                         /* we have enough to decode dev num */
 243                                         __u64 mjr; /* major */
 244                                         __u64 mnr; /* minor */
 245                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 246                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 247                                         inode->i_rdev = MKDEV(mjr, mnr);
 248                                 }
 249                         } else if(memcmp("IntxCHR", pbuf, 8) == 0) {
 250                                 cFYI(1,("Char device"));
 251                                 inode->i_mode |= S_IFCHR;
 252                                 if(bytes_read == 24) {
 253                                         /* we have enough to decode dev num */
 254                                         __u64 mjr; /* major */
 255                                         __u64 mnr; /* minor */
 256                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 257                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 258                                         inode->i_rdev = MKDEV(mjr, mnr);
 259                                 }
 260                         } else if(memcmp("IntxLNK", pbuf, 7) == 0) {
 261                                 cFYI(1,("Symlink"));
 262                                 inode->i_mode |= S_IFLNK;
 263                         } else {
 264                                 inode->i_mode |= S_IFREG; /* file? */
 265                                 rc = -EOPNOTSUPP;
 266                         }
 267                 } else {
 268                         inode->i_mode |= S_IFREG; /* then it is a file */
 269                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 270                 }
 271                 CIFSSMBClose(xid, pTcon, netfid);
 272         }
 273         return rc;
 274
 275 }
 276
 277 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 278
 279 static int get_sfu_uid_mode(struct inode * inode,
 280                         const unsigned char *path,
 281                         struct cifs_sb_info *cifs_sb, int xid)
 282 {
 283 #ifdef CONFIG_CIFS_XATTR
 284         ssize_t rc;
 285         char ea_value[4];
 286         __u32 mode;
 287
 288         rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
 289                         ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 290                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 291         if(rc < 0)
 292                 return (int)rc;
 293         else if (rc > 3) {
 294                 mode = le32_to_cpu(*((__le32 *)ea_value));
 295                 inode->i_mode &= ~SFBITS_MASK;
 296                 cFYI(1,("special bits 0%o org mode 0%o", mode, inode->i_mode));
 297                 inode->i_mode = (mode &  SFBITS_MASK) | inode->i_mode;
 298                 cFYI(1,("special mode bits 0%o", mode));
 299                 return 0;
 300         } else {
 301                 return 0;
 302         }
 303 #else
 304         return -EOPNOTSUPP;
 305 #endif
 306
 307
 308 }
 309
 310 int cifs_get_inode_info(struct inode **pinode,
 311         const unsigned char *search_path, FILE_ALL_INFO *pfindData,
 312         struct super_block *sb, int xid)
 313 {
 314         int rc = 0;
 315         struct cifsTconInfo *pTcon;
 316         struct inode *inode;
 317         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 318         char *tmp_path;
 319         char *buf = NULL;
 320
 321         pTcon = cifs_sb->tcon;
 322         cFYI(1,("Getting info on %s", search_path));
 323
 324         if ((pfindData == NULL) && (*pinode != NULL)) {
 325                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 326                         cFYI(1,("No need to revalidate cached inode sizes"));
 327                         return rc;
 328                 }
 329         }
 330
 331         /* if file info not passed in then get it from server */
 332         if (pfindData == NULL) {
 333                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 334                 if (buf == NULL)
 335                         return -ENOMEM;
 336                 pfindData = (FILE_ALL_INFO *)buf;
 337                 /* could do find first instead but this returns more info */
 338                 rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
 339                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 340                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 341                 /* BB optimize code so we do not make the above call
 342                 when server claims no NT SMB support and the above call
 343                 failed at least once - set flag in tcon or mount */
 344                 if((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 345                         rc = SMBQueryInformation(xid, pTcon, search_path,
 346                                         pfindData, cifs_sb->local_nls,
 347                                         cifs_sb->mnt_cifs_flags &
 348                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 349                 }
 350
 351         }
 352         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
 353         if (rc) {
 354                 if (rc == -EREMOTE) {
 355                         tmp_path =
 356                             kmalloc(strnlen
 357                                     (pTcon->treeName,
 358                                      MAX_TREE_SIZE + 1) +
 359                                     strnlen(search_path, MAX_PATHCONF) + 1,
 360                                     GFP_KERNEL);
 361                         if (tmp_path == NULL) {
 362                                 kfree(buf);
 363                                 return -ENOMEM;
 364                         }
 365
 366                         strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
 367                         strncat(tmp_path, search_path, MAX_PATHCONF);
 368                         rc = connect_to_dfs_path(xid, pTcon->ses,
 369                                                  /* treename + */ tmp_path,
 370                                                  cifs_sb->local_nls,
 371                                                  cifs_sb->mnt_cifs_flags &
 372                                                    CIFS_MOUNT_MAP_SPECIAL_CHR);
 373                         kfree(tmp_path);
 374                         /* BB fix up inode etc. */
 375                 } else if (rc) {
 376                         kfree(buf);
 377                         return rc;
 378                 }
 379         } else {
 380                 struct cifsInodeInfo *cifsInfo;
 381                 __u32 attr = le32_to_cpu(pfindData->Attributes);
 382
 383                 /* get new inode */
 384                 if (*pinode == NULL) {
 385                         *pinode = new_inode(sb);
 386                         if (*pinode == NULL)
 387                                 return -ENOMEM;
 388                         /* Is an i_ino of zero legal? Can we use that to check
 389                            if the server supports returning inode numbers?  Are
 390                            there other sanity checks we can use to ensure that
 391                            the server is really filling in that field? */
 392
 393                         /* We can not use the IndexNumber field by default from
 394                            Windows or Samba (in ALL_INFO buf) but we can request
 395                            it explicitly.  It may not be unique presumably if
 396                            the server has multiple devices mounted under one
 397                            share */
 398
 399                         /* There may be higher info levels that work but are
 400                            there Windows server or network appliances for which
 401                            IndexNumber field is not guaranteed unique? */
 402
 403                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM){
 404                                 int rc1 = 0;
 405                                 __u64 inode_num;
 406
 407                                 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 408                                         search_path, &inode_num,
 409                                         cifs_sb->local_nls,
 410                                         cifs_sb->mnt_cifs_flags &
 411                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 412                                 if (rc1) {
 413                                         cFYI(1,("GetSrvInodeNum rc %d", rc1));
 414                                         /* BB EOPNOSUPP disable SERVER_INUM? */
 415                                 } else /* do we need cast or hash to ino? */
 416                                         (*pinode)->i_ino = inode_num;
 417                         } /* else ino incremented to unique num in new_inode*/
 418                         insert_inode_hash(*pinode);
 419                 }
 420                 inode = *pinode;
 421                 cifsInfo = CIFS_I(inode);
 422                 cifsInfo->cifsAttrs = attr;
 423                 cFYI(1, ("Old time %ld ", cifsInfo->time));
 424                 cifsInfo->time = jiffies;
 425                 cFYI(1, ("New time %ld ", cifsInfo->time));
 426
 427                 /* blksize needs to be multiple of two. So safer to default to
 428                 blksize and blkbits set in superblock so 2**blkbits and blksize
 429                 will match rather than setting to:
 430                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 431
 432                 /* Linux can not store file creation time unfortunately so we ignore it */
 433                 inode->i_atime =
 434                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 435                 inode->i_mtime =
 436                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 437                 inode->i_ctime =
 438                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 439                 cFYI(0, ("Attributes came in as 0x%x ", attr));
 440
 441                 /* set default mode. will override for dirs below */
 442                 if (atomic_read(&cifsInfo->inUse) == 0)
 443                         /* new inode, can safely set these fields */
 444                         inode->i_mode = cifs_sb->mnt_file_mode;
 445                 else /* since we set the inode type below we need to mask off
 446                      to avoid strange results if type changes and both get orred in */
 447                         inode->i_mode &= ~S_IFMT;
 448 /*              if (attr & ATTR_REPARSE)  */
 449                 /* We no longer handle these as symlinks because we could not
 450                    follow them due to the absolute path with drive letter */
 451                 if (attr & ATTR_DIRECTORY) {
 452                 /* override default perms since we do not do byte range locking
 453                    on dirs */
 454                         inode->i_mode = cifs_sb->mnt_dir_mode;
 455                         inode->i_mode |= S_IFDIR;
 456                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 457                            (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
 458                            /* No need to le64 convert size of zero */
 459                            (pfindData->EndOfFile == 0)) {
 460                         inode->i_mode = cifs_sb->mnt_file_mode;
 461                         inode->i_mode |= S_IFIFO;
 462 /* BB Finish for SFU style symlinks and devices */
 463                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 464                            (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
 465                         if (decode_sfu_inode(inode,
 466                                          le64_to_cpu(pfindData->EndOfFile),
 467                                          search_path,
 468                                          cifs_sb, xid)) {
 469                                 cFYI(1,("Unrecognized sfu inode type"));
 470                         }
 471                         cFYI(1,("sfu mode 0%o",inode->i_mode));
 472                 } else {
 473                         inode->i_mode |= S_IFREG;
 474                         /* treat the dos attribute of read-only as read-only
 475                            mode e.g. 555 */
 476                         if (cifsInfo->cifsAttrs & ATTR_READONLY)
 477                                 inode->i_mode &= ~(S_IWUGO);
 478                 /* BB add code here -
 479                    validate if device or weird share or device type? */
 480                 }
 481                 if (is_size_safe_to_change(cifsInfo)) {
 482                         /* can not safely change the file size here if the
 483                            client is writing to it due to potential races */
 484                         i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));
 485
 486                         /* 512 bytes (2**9) is the fake blocksize that must be
 487                            used for this calculation */
 488                         inode->i_blocks = (512 - 1 + le64_to_cpu(
 489                                            pfindData->AllocationSize)) >> 9;
 490                 }
 491
 492                 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 493
 494                 /* BB fill in uid and gid here? with help from winbind?
 495                    or retrieve from NTFS stream extended attribute */
 496                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 497                         /* fill in uid, gid, mode from server ACL */
 498                         get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
 499                 } else if (atomic_read(&cifsInfo->inUse) == 0) {
 500                         inode->i_uid = cifs_sb->mnt_uid;
 501                         inode->i_gid = cifs_sb->mnt_gid;
 502                         /* set so we do not keep refreshing these fields with
 503                            bad data after user has changed them in memory */
 504                         atomic_set(&cifsInfo->inUse,1);
 505                 }
 506
 507                 if (S_ISREG(inode->i_mode)) {
 508                         cFYI(1, ("File inode"));
 509                         inode->i_op = &cifs_file_inode_ops;
 510                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 511                                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 512                                         inode->i_fop =
 513                                                 &cifs_file_direct_nobrl_ops;
 514                                 else
 515                                         inode->i_fop = &cifs_file_direct_ops;
 516                         } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 517                                 inode->i_fop = &cifs_file_nobrl_ops;
 518                         else /* not direct, send byte range locks */
 519                                 inode->i_fop = &cifs_file_ops;
 520
 521                         inode->i_data.a_ops = &cifs_addr_ops;
 522                         if(pTcon->ses->server->maxBuf <
 523                              4096 + MAX_CIFS_HDR_SIZE)
 524                                 inode->i_data.a_ops->readpages = NULL;
 525                 } else if (S_ISDIR(inode->i_mode)) {
 526                         cFYI(1, ("Directory inode"));
 527                         inode->i_op = &cifs_dir_inode_ops;
 528                         inode->i_fop = &cifs_dir_ops;
 529                 } else if (S_ISLNK(inode->i_mode)) {
 530                         cFYI(1, ("Symbolic Link inode"));
 531                         inode->i_op = &cifs_symlink_inode_ops;
 532                 } else {
 533                         init_special_inode(inode, inode->i_mode,
 534                                            inode->i_rdev);
 535                 }
 536         }
 537         kfree(buf);
 538         return rc;
 539 }
 540
 541 /* gets root inode */
 542 void cifs_read_inode(struct inode *inode)
 543 {
 544         int xid;
 545         struct cifs_sb_info *cifs_sb;
 546
 547         cifs_sb = CIFS_SB(inode->i_sb);
 548         xid = GetXid();
 549         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
 550                 cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
 551         else
 552                 cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
 553         /* can not call macro FreeXid here since in a void func */
 554         _FreeXid(xid);
 555 }
 556
 557 int cifs_unlink(struct inode *inode, struct dentry *direntry)
 558 {
 559         int rc = 0;
 560         int xid;
 561         struct cifs_sb_info *cifs_sb;
 562         struct cifsTconInfo *pTcon;
 563         char *full_path = NULL;
 564         struct cifsInodeInfo *cifsInode;
 565         FILE_BASIC_INFO *pinfo_buf;
 566
 567         cFYI(1, ("cifs_unlink, inode = 0x%p with ", inode));
 568
 569         xid = GetXid();
 570
 571         cifs_sb = CIFS_SB(inode->i_sb);
 572         pTcon = cifs_sb->tcon;
 573
 574         /* Unlink can be called from rename so we can not grab the sem here
 575            since we deadlock otherwise */
 576 /*      down(&direntry->d_sb->s_vfs_rename_sem);*/
 577         full_path = build_path_from_dentry(direntry);
 578 /*      up(&direntry->d_sb->s_vfs_rename_sem);*/
 579         if (full_path == NULL) {
 580                 FreeXid(xid);
 581                 return -ENOMEM;
 582         }
 583         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
 584                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 585
 586         if (!rc) {
 587                 if (direntry->d_inode)
 588                         direntry->d_inode->i_nlink--;
 589         } else if (rc == -ENOENT) {
 590                 d_drop(direntry);
 591         } else if (rc == -ETXTBSY) {
 592                 int oplock = FALSE;
 593                 __u16 netfid;
 594
 595                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
 596                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
 597                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
 598                                  cifs_sb->mnt_cifs_flags &
 599                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 600                 if (rc==0) {
 601                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
 602                                               cifs_sb->local_nls,
 603                                               cifs_sb->mnt_cifs_flags &
 604                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 605                         CIFSSMBClose(xid, pTcon, netfid);
 606                         if (direntry->d_inode)
 607                                 direntry->d_inode->i_nlink--;
 608                 }
 609         } else if (rc == -EACCES) {
 610                 /* try only if r/o attribute set in local lookup data? */
 611                 pinfo_buf = kmalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
 612                 if (pinfo_buf) {
 613                         memset(pinfo_buf, 0, sizeof(FILE_BASIC_INFO));
 614                         /* ATTRS set to normal clears r/o bit */
 615                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
 616                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
 617                                 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
 618                                                      pinfo_buf,
 619                                                      cifs_sb->local_nls,
 620                                                      cifs_sb->mnt_cifs_flags &
 621                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 622                         else
 623                                 rc = -EOPNOTSUPP;
 624
 625                         if (rc == -EOPNOTSUPP) {
 626                                 int oplock = FALSE;
 627                                 __u16 netfid;
 628                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
 629                                                           full_path,
 630                                                           (__u16)ATTR_NORMAL,
 631                                                           cifs_sb->local_nls);
 632                            For some strange reason it seems that NT4 eats the
 633                            old setattr call without actually setting the
 634                            attributes so on to the third attempted workaround
 635                            */
 636
 637                         /* BB could scan to see if we already have it open
 638                            and pass in pid of opener to function */
 639                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 640                                                  FILE_OPEN, SYNCHRONIZE |
 641                                                  FILE_WRITE_ATTRIBUTES, 0,
 642                                                  &netfid, &oplock, NULL,
 643                                                  cifs_sb->local_nls,
 644                                                  cifs_sb->mnt_cifs_flags &
 645                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 646                                 if (rc==0) {
 647                                         rc = CIFSSMBSetFileTimes(xid, pTcon,
 648                                                                  pinfo_buf,
 649                                                                  netfid);
 650                                         CIFSSMBClose(xid, pTcon, netfid);
 651                                 }
 652                         }
 653                         kfree(pinfo_buf);
 654                 }
 655                 if (rc==0) {
 656                         rc = CIFSSMBDelFile(xid, pTcon, full_path,
 657                                             cifs_sb->local_nls,
 658                                             cifs_sb->mnt_cifs_flags &
 659                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 660                         if (!rc) {
 661                                 if (direntry->d_inode)
 662                                         direntry->d_inode->i_nlink--;
 663                         } else if (rc == -ETXTBSY) {
 664                                 int oplock = FALSE;
 665                                 __u16 netfid;
 666
 667                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 668                                                  FILE_OPEN, DELETE,
 669                                                  CREATE_NOT_DIR |
 670                                                  CREATE_DELETE_ON_CLOSE,
 671                                                  &netfid, &oplock, NULL,
 672                                                  cifs_sb->local_nls,
 673                                                  cifs_sb->mnt_cifs_flags &
 674                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 675                                 if (rc==0) {
 676                                         CIFSSMBRenameOpenFile(xid, pTcon,
 677                                                 netfid, NULL,
 678                                                 cifs_sb->local_nls,
 679                                                 cifs_sb->mnt_cifs_flags &
 680                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 681                                         CIFSSMBClose(xid, pTcon, netfid);
 682                                         if (direntry->d_inode)
 683                                                 direntry->d_inode->i_nlink--;
 684                                 }
 685                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
 686                         }
 687                 }
 688         }
 689         if (direntry->d_inode) {
 690                 cifsInode = CIFS_I(direntry->d_inode);
 691                 cifsInode->time = 0;    /* will force revalidate to get info
 692                                            when needed */
 693                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
 694         }
 695         inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
 696         cifsInode = CIFS_I(inode);
 697         cifsInode->time = 0;    /* force revalidate of dir as well */
 698
 699         kfree(full_path);
 700         FreeXid(xid);
 701         return rc;
 702 }
 703
 704 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 705 {
 706         int rc = 0;
 707         int xid;
 708         struct cifs_sb_info *cifs_sb;
 709         struct cifsTconInfo *pTcon;
 710         char *full_path = NULL;
 711         struct inode *newinode = NULL;
 712
 713         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p ", mode, inode));
 714
 715         xid = GetXid();
 716
 717         cifs_sb = CIFS_SB(inode->i_sb);
 718         pTcon = cifs_sb->tcon;
 719
 720         down(&inode->i_sb->s_vfs_rename_sem);
 721         full_path = build_path_from_dentry(direntry);
 722         up(&inode->i_sb->s_vfs_rename_sem);
 723         if (full_path == NULL) {
 724                 FreeXid(xid);
 725                 return -ENOMEM;
 726         }
 727         /* BB add setting the equivalent of mode via CreateX w/ACLs */
 728         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
 729                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 730         if (rc) {
 731                 cFYI(1, ("cifs_mkdir returned 0x%x ", rc));
 732                 d_drop(direntry);
 733         } else {
 734                 inode->i_nlink++;
 735                 if (pTcon->ses->capabilities & CAP_UNIX)
 736                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 737                                                       inode->i_sb,xid);
 738                 else
 739                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 740                                                  inode->i_sb,xid);
 741
 742                 if (pTcon->nocase)
 743                         direntry->d_op = &cifs_ci_dentry_ops;
 744                 else
 745                         direntry->d_op = &cifs_dentry_ops;
 746                 d_instantiate(direntry, newinode);
 747                 if (direntry->d_inode)
 748                         direntry->d_inode->i_nlink = 2;
 749                 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
 750                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 751                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 752                                                     mode,
 753                                                     (__u64)current->euid,
 754                                                     (__u64)current->egid,
 755                                                     0 /* dev_t */,
 756                                                     cifs_sb->local_nls,
 757                                                     cifs_sb->mnt_cifs_flags &
 758                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 759                         } else {
 760                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 761                                                     mode, (__u64)-1,
 762                                                     (__u64)-1, 0 /* dev_t */,
 763                                                     cifs_sb->local_nls,
 764                                                     cifs_sb->mnt_cifs_flags &
 765                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 766                         }
 767                 else {
 768                         /* BB to be implemented via Windows secrty descriptors
 769                            eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
 770                                                  -1, -1, local_nls); */
 771                 }
 772         }
 773         kfree(full_path);
 774         FreeXid(xid);
 775         return rc;
 776 }
 777
 778 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 779 {
 780         int rc = 0;
 781         int xid;
 782         struct cifs_sb_info *cifs_sb;
 783         struct cifsTconInfo *pTcon;
 784         char *full_path = NULL;
 785         struct cifsInodeInfo *cifsInode;
 786
 787         cFYI(1, ("cifs_rmdir, inode = 0x%p with ", inode));
 788
 789         xid = GetXid();
 790
 791         cifs_sb = CIFS_SB(inode->i_sb);
 792         pTcon = cifs_sb->tcon;
 793
 794         down(&inode->i_sb->s_vfs_rename_sem);
 795         full_path = build_path_from_dentry(direntry);
 796         up(&inode->i_sb->s_vfs_rename_sem);
 797         if (full_path == NULL) {
 798                 FreeXid(xid);
 799                 return -ENOMEM;
 800         }
 801
 802         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
 803                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 804
 805         if (!rc) {
 806                 inode->i_nlink--;
 807                 i_size_write(direntry->d_inode,0);
 808                 direntry->d_inode->i_nlink = 0;
 809         }
 810
 811         cifsInode = CIFS_I(direntry->d_inode);
 812         cifsInode->time = 0;    /* force revalidate to go get info when
 813                                    needed */
 814         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
 815                 current_fs_time(inode->i_sb);
 816
 817         kfree(full_path);
 818         FreeXid(xid);
 819         return rc;
 820 }
 821
 822 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
 823         struct inode *target_inode, struct dentry *target_direntry)
 824 {
 825         char *fromName;
 826         char *toName;
 827         struct cifs_sb_info *cifs_sb_source;
 828         struct cifs_sb_info *cifs_sb_target;
 829         struct cifsTconInfo *pTcon;
 830         int xid;
 831         int rc = 0;
 832
 833         xid = GetXid();
 834
 835         cifs_sb_target = CIFS_SB(target_inode->i_sb);
 836         cifs_sb_source = CIFS_SB(source_inode->i_sb);
 837         pTcon = cifs_sb_source->tcon;
 838
 839         if (pTcon != cifs_sb_target->tcon) {
 840                 FreeXid(xid);
 841                 return -EXDEV;  /* BB actually could be allowed if same server,
 842                                    but different share.
 843                                    Might eventually add support for this */
 844         }
 845
 846         /* we already  have the rename sem so we do not need to grab it again
 847            here to protect the path integrity */
 848         fromName = build_path_from_dentry(source_direntry);
 849         toName = build_path_from_dentry(target_direntry);
 850         if ((fromName == NULL) || (toName == NULL)) {
 851                 rc = -ENOMEM;
 852                 goto cifs_rename_exit;
 853         }
 854
 855         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
 856                            cifs_sb_source->local_nls,
 857                            cifs_sb_source->mnt_cifs_flags &
 858                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 859         if (rc == -EEXIST) {
 860                 /* check if they are the same file because rename of hardlinked
 861                    files is a noop */
 862                 FILE_UNIX_BASIC_INFO *info_buf_source;
 863                 FILE_UNIX_BASIC_INFO *info_buf_target;
 864
 865                 info_buf_source =
 866                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 867                 if (info_buf_source != NULL) {
 868                         info_buf_target = info_buf_source + 1;
 869                         rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
 870                                 info_buf_source, cifs_sb_source->local_nls,
 871                                 cifs_sb_source->mnt_cifs_flags &
 872                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 873                         if (rc == 0) {
 874                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
 875                                                 info_buf_target,
 876                                                 cifs_sb_target->local_nls,
 877                                                 /* remap based on source sb */
 878                                                 cifs_sb_source->mnt_cifs_flags &
 879                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 880                         }
 881                         if ((rc == 0) &&
 882                             (info_buf_source->UniqueId ==
 883                              info_buf_target->UniqueId)) {
 884                         /* do not rename since the files are hardlinked which
 885                            is a noop */
 886                         } else {
 887                         /* we either can not tell the files are hardlinked
 888                            (as with Windows servers) or files are not
 889                            hardlinked so delete the target manually before
 890                            renaming to follow POSIX rather than Windows
 891                            semantics */
 892                                 cifs_unlink(target_inode, target_direntry);
 893                                 rc = CIFSSMBRename(xid, pTcon, fromName,
 894                                                    toName,
 895                                                    cifs_sb_source->local_nls,
 896                                                    cifs_sb_source->mnt_cifs_flags
 897                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
 898                         }
 899                         kfree(info_buf_source);
 900                 } /* if we can not get memory just leave rc as EEXIST */
 901         }
 902
 903         if (rc) {
 904                 cFYI(1, ("rename rc %d", rc));
 905         }
 906
 907         if ((rc == -EIO) || (rc == -EEXIST)) {
 908                 int oplock = FALSE;
 909                 __u16 netfid;
 910
 911                 /* BB FIXME Is Generic Read correct for rename? */
 912                 /* if renaming directory - we should not say CREATE_NOT_DIR,
 913                    need to test renaming open directory, also GENERIC_READ
 914                    might not right be right access to request */
 915                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
 916                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
 917                                  cifs_sb_source->local_nls,
 918                                  cifs_sb_source->mnt_cifs_flags &
 919                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 920                 if (rc==0) {
 921                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
 922                                               cifs_sb_source->local_nls,
 923                                               cifs_sb_source->mnt_cifs_flags &
 924                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 925                         CIFSSMBClose(xid, pTcon, netfid);
 926                 }
 927         }
 928
 929 cifs_rename_exit:
 930         kfree(fromName);
 931         kfree(toName);
 932         FreeXid(xid);
 933         return rc;
 934 }
 935
 936 int cifs_revalidate(struct dentry *direntry)
 937 {
 938         int xid;
 939         int rc = 0;
 940         char *full_path;
 941         struct cifs_sb_info *cifs_sb;
 942         struct cifsInodeInfo *cifsInode;
 943         loff_t local_size;
 944         struct timespec local_mtime;
 945         int invalidate_inode = FALSE;
 946
 947         if (direntry->d_inode == NULL)
 948                 return -ENOENT;
 949
 950         cifsInode = CIFS_I(direntry->d_inode);
 951
 952         if (cifsInode == NULL)
 953                 return -ENOENT;
 954
 955         /* no sense revalidating inode info on file that no one can write */
 956         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
 957                 return rc;
 958
 959         xid = GetXid();
 960
 961         cifs_sb = CIFS_SB(direntry->d_sb);
 962
 963         /* can not safely grab the rename sem here if rename calls revalidate
 964            since that would deadlock */
 965         full_path = build_path_from_dentry(direntry);
 966         if (full_path == NULL) {
 967                 FreeXid(xid);
 968                 return -ENOMEM;
 969         }
 970         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
 971                  "jiffies %ld", full_path, direntry->d_inode,
 972                  direntry->d_inode->i_count.counter, direntry,
 973                  direntry->d_time, jiffies));
 974
 975         if (cifsInode->time == 0) {
 976                 /* was set to zero previously to force revalidate */
 977         } else if (time_before(jiffies, cifsInode->time + HZ) &&
 978                    lookupCacheEnabled) {
 979                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
 980                     (direntry->d_inode->i_nlink == 1)) {
 981                         kfree(full_path);
 982                         FreeXid(xid);
 983                         return rc;
 984                 } else {
 985                         cFYI(1, ("Have to revalidate file due to hardlinks"));
 986                 }
 987         }
 988
 989         /* save mtime and size */
 990         local_mtime = direntry->d_inode->i_mtime;
 991         local_size = direntry->d_inode->i_size;
 992
 993         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
 994                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
 995                                               direntry->d_sb,xid);
 996                 if (rc) {
 997                         cFYI(1, ("error on getting revalidate info %d", rc));
 998 /*                      if (rc != -ENOENT)
 999                                 rc = 0; */      /* BB should we cache info on
1000                                                    certain errors? */
1001                 }
1002         } else {
1003                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1004                                          direntry->d_sb,xid);
1005                 if (rc) {
1006                         cFYI(1, ("error on getting revalidate info %d", rc));
1007 /*                      if (rc != -ENOENT)
1008                                 rc = 0; */      /* BB should we cache info on
1009                                                    certain errors? */
1010                 }
1011         }
1012         /* should we remap certain errors, access denied?, to zero */
1013
1014         /* if not oplocked, we invalidate inode pages if mtime or file size
1015            had changed on server */
1016
1017         if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) &&
1018             (local_size == direntry->d_inode->i_size)) {
1019                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1020         } else {
1021                 /* file may have changed on server */
1022                 if (cifsInode->clientCanCacheRead) {
1023                         /* no need to invalidate inode pages since we were the
1024                            only ones who could have modified the file and the
1025                            server copy is staler than ours */
1026                 } else {
1027                         invalidate_inode = TRUE;
1028                 }
1029         }
1030
1031         /* can not grab this sem since kernel filesys locking documentation
1032            indicates i_sem may be taken by the kernel on lookup and rename
1033            which could deadlock if we grab the i_sem here as well */
1034 /*      down(&direntry->d_inode->i_sem);*/
1035         /* need to write out dirty pages here  */
1036         if (direntry->d_inode->i_mapping) {
1037                 /* do we need to lock inode until after invalidate completes
1038                    below? */
1039                 filemap_fdatawrite(direntry->d_inode->i_mapping);
1040         }
1041         if (invalidate_inode) {
1042                 if (direntry->d_inode->i_mapping)
1043                         filemap_fdatawait(direntry->d_inode->i_mapping);
1044                 /* may eventually have to do this for open files too */
1045                 if (list_empty(&(cifsInode->openFileList))) {
1046                         /* Has changed on server - flush read ahead pages */
1047                         cFYI(1, ("Invalidating read ahead data on "
1048                                  "closed file"));
1049                         invalidate_remote_inode(direntry->d_inode);
1050                 }
1051         }
1052 /*      up(&direntry->d_inode->i_sem); */
1053
1054         kfree(full_path);
1055         FreeXid(xid);
1056         return rc;
1057 }
1058
1059 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1060         struct kstat *stat)
1061 {
1062         int err = cifs_revalidate(dentry);
1063         if (!err)
1064                 generic_fillattr(dentry->d_inode, stat);
1065         return err;
1066 }
1067
1068 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1069 {
1070         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1071         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1072         struct page *page;
1073         char *kaddr;
1074         int rc = 0;
1075
1076         page = grab_cache_page(mapping, index);
1077         if (!page)
1078                 return -ENOMEM;
1079
1080         kaddr = kmap_atomic(page, KM_USER0);
1081         memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1082         flush_dcache_page(page);
1083         kunmap_atomic(kaddr, KM_USER0);
1084         unlock_page(page);
1085         page_cache_release(page);
1086         return rc;
1087 }
1088
1089 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1090 {
1091         int xid;
1092         struct cifs_sb_info *cifs_sb;
1093         struct cifsTconInfo *pTcon;
1094         char *full_path = NULL;
1095         int rc = -EACCES;
1096         struct cifsFileInfo *open_file = NULL;
1097         FILE_BASIC_INFO time_buf;
1098         int set_time = FALSE;
1099         __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1100         __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1101         __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1102         struct cifsInodeInfo *cifsInode;
1103
1104         xid = GetXid();
1105
1106         cFYI(1, ("In cifs_setattr, name = %s attrs->iavalid 0x%x ",
1107                  direntry->d_name.name, attrs->ia_valid));
1108         cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1109         pTcon = cifs_sb->tcon;
1110
1111         down(&direntry->d_sb->s_vfs_rename_sem);
1112         full_path = build_path_from_dentry(direntry);
1113         up(&direntry->d_sb->s_vfs_rename_sem);
1114         if (full_path == NULL) {
1115                 FreeXid(xid);
1116                 return -ENOMEM;
1117         }
1118         cifsInode = CIFS_I(direntry->d_inode);
1119
1120         /* BB check if we need to refresh inode from server now ? BB */
1121
1122         /* need to flush data before changing file size on server */
1123         filemap_fdatawrite(direntry->d_inode->i_mapping);
1124         filemap_fdatawait(direntry->d_inode->i_mapping);
1125
1126         if (attrs->ia_valid & ATTR_SIZE) {
1127                 /* To avoid spurious oplock breaks from server, in the case of
1128                    inodes that we already have open, avoid doing path based
1129                    setting of file size if we can do it by handle.
1130                    This keeps our caching token (oplock) and avoids timeouts
1131                    when the local oplock break takes longer to flush
1132                    writebehind data than the SMB timeout for the SetPathInfo
1133                    request would allow */
1134                 open_file = find_writable_file(cifsInode);
1135                 if (open_file) {
1136                         __u16 nfid = open_file->netfid;
1137                         __u32 npid = open_file->pid;
1138                         rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1139                                                 nfid, npid, FALSE);
1140                         atomic_dec(&open_file->wrtPending);
1141                         cFYI(1,("SetFSize for attrs rc = %d", rc));
1142                         if(rc == -EINVAL) {
1143                                 int bytes_written;
1144                                 rc = CIFSSMBWrite(xid, pTcon,
1145                                                   nfid, 0, attrs->ia_size,
1146                                                   &bytes_written, NULL, NULL,
1147                                                   1 /* 45 seconds */);
1148                                 cFYI(1,("Wrt seteof rc %d", rc));
1149                         }
1150                 }
1151                 if (rc != 0) {
1152                         /* Set file size by pathname rather than by handle
1153                            either because no valid, writeable file handle for
1154                            it was found or because there was an error setting
1155                            it by handle */
1156                         rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1157                                            attrs->ia_size, FALSE,
1158                                            cifs_sb->local_nls,
1159                                            cifs_sb->mnt_cifs_flags &
1160                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1161                         cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1162                         if(rc == -EINVAL) {
1163                                 __u16 netfid;
1164                                 int oplock = FALSE;
1165
1166                                 rc = SMBLegacyOpen(xid, pTcon, full_path,
1167                                         FILE_OPEN,
1168                                         SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1169                                         CREATE_NOT_DIR, &netfid, &oplock,
1170                                         NULL, cifs_sb->local_nls,
1171                                         cifs_sb->mnt_cifs_flags &
1172                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1173                                 if (rc==0) {
1174                                         int bytes_written;
1175                                         rc = CIFSSMBWrite(xid, pTcon,
1176                                                         netfid, 0,
1177                                                         attrs->ia_size,
1178                                                         &bytes_written, NULL,
1179                                                         NULL, 1 /* 45 sec */);
1180                                         cFYI(1,("wrt seteof rc %d",rc));
1181                                         CIFSSMBClose(xid, pTcon, netfid);
1182                                 }
1183
1184                         }
1185                 }
1186
1187                 /* Server is ok setting allocation size implicitly - no need
1188                    to call:
1189                 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1190                          cifs_sb->local_nls);
1191                    */
1192
1193                 if (rc == 0) {
1194                         rc = vmtruncate(direntry->d_inode, attrs->ia_size);
1195                         cifs_truncate_page(direntry->d_inode->i_mapping,
1196                                            direntry->d_inode->i_size);
1197                 } else
1198                         goto cifs_setattr_exit;
1199         }
1200         if (attrs->ia_valid & ATTR_UID) {
1201                 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1202                 uid = attrs->ia_uid;
1203         }
1204         if (attrs->ia_valid & ATTR_GID) {
1205                 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1206                 gid = attrs->ia_gid;
1207         }
1208
1209         time_buf.Attributes = 0;
1210         if (attrs->ia_valid & ATTR_MODE) {
1211                 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1212                 mode = attrs->ia_mode;
1213         }
1214
1215         if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1216             && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1217                 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1218                                          0 /* dev_t */, cifs_sb->local_nls,
1219                                          cifs_sb->mnt_cifs_flags &
1220                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1221         else if (attrs->ia_valid & ATTR_MODE) {
1222                 rc = 0;
1223                 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1224                         if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0)
1225                                 time_buf.Attributes =
1226                                         cpu_to_le32(cifsInode->cifsAttrs |
1227                                                     ATTR_READONLY);
1228                 } else if ((mode & S_IWUGO) == S_IWUGO) {
1229                         if (cifsInode->cifsAttrs & ATTR_READONLY)
1230                                 time_buf.Attributes =
1231                                         cpu_to_le32(cifsInode->cifsAttrs &
1232                                                     (~ATTR_READONLY));
1233                 }
1234                 /* BB to be implemented -
1235                    via Windows security descriptors or streams */
1236                 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1237                                       cifs_sb->local_nls); */
1238         }
1239
1240         if (attrs->ia_valid & ATTR_ATIME) {
1241                 set_time = TRUE;
1242                 time_buf.LastAccessTime =
1243                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1244         } else
1245                 time_buf.LastAccessTime = 0;
1246
1247         if (attrs->ia_valid & ATTR_MTIME) {
1248                 set_time = TRUE;
1249                 time_buf.LastWriteTime =
1250                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1251         } else
1252                 time_buf.LastWriteTime = 0;
1253         /* Do not set ctime explicitly unless other time
1254            stamps are changed explicitly (i.e. by utime()
1255            since we would then have a mix of client and
1256            server times */
1257
1258         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1259                 set_time = TRUE;
1260                 /* Although Samba throws this field away
1261                 it may be useful to Windows - but we do
1262                 not want to set ctime unless some other
1263                 timestamp is changing */
1264                 cFYI(1, ("CIFS - CTIME changed "));
1265                 time_buf.ChangeTime =
1266                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1267         } else
1268                 time_buf.ChangeTime = 0;
1269
1270         if (set_time || time_buf.Attributes) {
1271                 time_buf.CreationTime = 0;      /* do not change */
1272                 /* In the future we should experiment - try setting timestamps
1273                    via Handle (SetFileInfo) instead of by path */
1274                 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1275                         rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1276                                              cifs_sb->local_nls,
1277                                              cifs_sb->mnt_cifs_flags &
1278                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1279                 else
1280                         rc = -EOPNOTSUPP;
1281
1282                 if (rc == -EOPNOTSUPP) {
1283                         int oplock = FALSE;
1284                         __u16 netfid;
1285
1286                         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1287                                  "times not supported by this server"));
1288                         /* BB we could scan to see if we already have it open
1289                            and pass in pid of opener to function */
1290                         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1291                                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1292                                          CREATE_NOT_DIR, &netfid, &oplock,
1293                                          NULL, cifs_sb->local_nls,
1294                                          cifs_sb->mnt_cifs_flags &
1295                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1296                         if (rc==0) {
1297                                 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1298                                                          netfid);
1299                                 CIFSSMBClose(xid, pTcon, netfid);
1300                         } else {
1301                         /* BB For even older servers we could convert time_buf
1302                            into old DOS style which uses two second
1303                            granularity */
1304
1305                         /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1306                                         &time_buf, cifs_sb->local_nls); */
1307                         }
1308                 }
1309                 /* Even if error on time set, no sense failing the call if
1310                 the server would set the time to a reasonable value anyway,
1311                 and this check ensures that we are not being called from
1312                 sys_utimes in which case we ought to fail the call back to
1313                 the user when the server rejects the call */
1314                 if((rc) && (attrs->ia_valid &&
1315                          (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1316                         rc = 0;
1317         }
1318
1319         /* do not need local check to inode_check_ok since the server does
1320            that */
1321         if (!rc)
1322                 rc = inode_setattr(direntry->d_inode, attrs);
1323 cifs_setattr_exit:
1324         kfree(full_path);
1325         FreeXid(xid);
1326         return rc;
1327 }
1328
1329 void cifs_delete_inode(struct inode *inode)
1330 {
1331         cFYI(1, ("In cifs_delete_inode, inode = 0x%p ", inode));
1332         /* may have to add back in if and when safe distributed caching of
1333            directories added e.g. via FindNotify */
1334 }