fs/cifs/inode.c

   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                 int buf_type = CIFS_NO_BUFFER;
 233                         /* Read header */
 234                 rc = CIFSSMBRead(xid, pTcon,
 235                                  netfid,
 236                                  24 /* length */, 0 /* offset */,
 237                                  &bytes_read, &pbuf, &buf_type);
 238                 if((rc == 0) && (bytes_read >= 8)) {
 239                         if(memcmp("IntxBLK", pbuf, 8) == 0) {
 240                                 cFYI(1,("Block device"));
 241                                 inode->i_mode |= S_IFBLK;
 242                                 if(bytes_read == 24) {
 243                                         /* we have enough to decode dev num */
 244                                         __u64 mjr; /* major */
 245                                         __u64 mnr; /* minor */
 246                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 247                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 248                                         inode->i_rdev = MKDEV(mjr, mnr);
 249                                 }
 250                         } else if(memcmp("IntxCHR", pbuf, 8) == 0) {
 251                                 cFYI(1,("Char device"));
 252                                 inode->i_mode |= S_IFCHR;
 253                                 if(bytes_read == 24) {
 254                                         /* we have enough to decode dev num */
 255                                         __u64 mjr; /* major */
 256                                         __u64 mnr; /* minor */
 257                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 258                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 259                                         inode->i_rdev = MKDEV(mjr, mnr);
 260                                 }
 261                         } else if(memcmp("IntxLNK", pbuf, 7) == 0) {
 262                                 cFYI(1,("Symlink"));
 263                                 inode->i_mode |= S_IFLNK;
 264                         } else {
 265                                 inode->i_mode |= S_IFREG; /* file? */
 266                                 rc = -EOPNOTSUPP;
 267                         }
 268                 } else {
 269                         inode->i_mode |= S_IFREG; /* then it is a file */
 270                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 271                 }
 272                 CIFSSMBClose(xid, pTcon, netfid);
 273         }
 274         return rc;
 275
 276 }
 277
 278 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 279
 280 static int get_sfu_uid_mode(struct inode * inode,
 281                         const unsigned char *path,
 282                         struct cifs_sb_info *cifs_sb, int xid)
 283 {
 284 #ifdef CONFIG_CIFS_XATTR
 285         ssize_t rc;
 286         char ea_value[4];
 287         __u32 mode;
 288
 289         rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
 290                         ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 291                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 292         if(rc < 0)
 293                 return (int)rc;
 294         else if (rc > 3) {
 295                 mode = le32_to_cpu(*((__le32 *)ea_value));
 296                 inode->i_mode &= ~SFBITS_MASK;
 297                 cFYI(1,("special bits 0%o org mode 0%o", mode, inode->i_mode));
 298                 inode->i_mode = (mode &  SFBITS_MASK) | inode->i_mode;
 299                 cFYI(1,("special mode bits 0%o", mode));
 300                 return 0;
 301         } else {
 302                 return 0;
 303         }
 304 #else
 305         return -EOPNOTSUPP;
 306 #endif
 307
 308
 309 }
 310
 311 int cifs_get_inode_info(struct inode **pinode,
 312         const unsigned char *search_path, FILE_ALL_INFO *pfindData,
 313         struct super_block *sb, int xid)
 314 {
 315         int rc = 0;
 316         struct cifsTconInfo *pTcon;
 317         struct inode *inode;
 318         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 319         char *tmp_path;
 320         char *buf = NULL;
 321
 322         pTcon = cifs_sb->tcon;
 323         cFYI(1,("Getting info on %s", search_path));
 324
 325         if ((pfindData == NULL) && (*pinode != NULL)) {
 326                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 327                         cFYI(1,("No need to revalidate cached inode sizes"));
 328                         return rc;
 329                 }
 330         }
 331
 332         /* if file info not passed in then get it from server */
 333         if (pfindData == NULL) {
 334                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 335                 if (buf == NULL)
 336                         return -ENOMEM;
 337                 pfindData = (FILE_ALL_INFO *)buf;
 338                 /* could do find first instead but this returns more info */
 339                 rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
 340                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 341                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 342                 /* BB optimize code so we do not make the above call
 343                 when server claims no NT SMB support and the above call
 344                 failed at least once - set flag in tcon or mount */
 345                 if((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 346                         rc = SMBQueryInformation(xid, pTcon, search_path,
 347                                         pfindData, cifs_sb->local_nls,
 348                                         cifs_sb->mnt_cifs_flags &
 349                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 350                 }
 351
 352         }
 353         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
 354         if (rc) {
 355                 if (rc == -EREMOTE) {
 356                         tmp_path =
 357                             kmalloc(strnlen
 358                                     (pTcon->treeName,
 359                                      MAX_TREE_SIZE + 1) +
 360                                     strnlen(search_path, MAX_PATHCONF) + 1,
 361                                     GFP_KERNEL);
 362                         if (tmp_path == NULL) {
 363                                 kfree(buf);
 364                                 return -ENOMEM;
 365                         }
 366
 367                         strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
 368                         strncat(tmp_path, search_path, MAX_PATHCONF);
 369                         rc = connect_to_dfs_path(xid, pTcon->ses,
 370                                                  /* treename + */ tmp_path,
 371                                                  cifs_sb->local_nls,
 372                                                  cifs_sb->mnt_cifs_flags &
 373                                                    CIFS_MOUNT_MAP_SPECIAL_CHR);
 374                         kfree(tmp_path);
 375                         /* BB fix up inode etc. */
 376                 } else if (rc) {
 377                         kfree(buf);
 378                         return rc;
 379                 }
 380         } else {
 381                 struct cifsInodeInfo *cifsInfo;
 382                 __u32 attr = le32_to_cpu(pfindData->Attributes);
 383
 384                 /* get new inode */
 385                 if (*pinode == NULL) {
 386                         *pinode = new_inode(sb);
 387                         if (*pinode == NULL)
 388                                 return -ENOMEM;
 389                         /* Is an i_ino of zero legal? Can we use that to check
 390                            if the server supports returning inode numbers?  Are
 391                            there other sanity checks we can use to ensure that
 392                            the server is really filling in that field? */
 393
 394                         /* We can not use the IndexNumber field by default from
 395                            Windows or Samba (in ALL_INFO buf) but we can request
 396                            it explicitly.  It may not be unique presumably if
 397                            the server has multiple devices mounted under one
 398                            share */
 399
 400                         /* There may be higher info levels that work but are
 401                            there Windows server or network appliances for which
 402                            IndexNumber field is not guaranteed unique? */
 403
 404                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM){
 405                                 int rc1 = 0;
 406                                 __u64 inode_num;
 407
 408                                 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 409                                         search_path, &inode_num,
 410                                         cifs_sb->local_nls,
 411                                         cifs_sb->mnt_cifs_flags &
 412                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 413                                 if (rc1) {
 414                                         cFYI(1,("GetSrvInodeNum rc %d", rc1));
 415                                         /* BB EOPNOSUPP disable SERVER_INUM? */
 416                                 } else /* do we need cast or hash to ino? */
 417                                         (*pinode)->i_ino = inode_num;
 418                         } /* else ino incremented to unique num in new_inode*/
 419                         insert_inode_hash(*pinode);
 420                 }
 421                 inode = *pinode;
 422                 cifsInfo = CIFS_I(inode);
 423                 cifsInfo->cifsAttrs = attr;
 424                 cFYI(1, ("Old time %ld ", cifsInfo->time));
 425                 cifsInfo->time = jiffies;
 426                 cFYI(1, ("New time %ld ", cifsInfo->time));
 427
 428                 /* blksize needs to be multiple of two. So safer to default to
 429                 blksize and blkbits set in superblock so 2**blkbits and blksize
 430                 will match rather than setting to:
 431                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 432
 433                 /* Linux can not store file creation time unfortunately so we ignore it */
 434                 inode->i_atime =
 435                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 436                 inode->i_mtime =
 437                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 438                 inode->i_ctime =
 439                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 440                 cFYI(0, ("Attributes came in as 0x%x ", attr));
 441
 442                 /* set default mode. will override for dirs below */
 443                 if (atomic_read(&cifsInfo->inUse) == 0)
 444                         /* new inode, can safely set these fields */
 445                         inode->i_mode = cifs_sb->mnt_file_mode;
 446                 else /* since we set the inode type below we need to mask off
 447                      to avoid strange results if type changes and both get orred in */
 448                         inode->i_mode &= ~S_IFMT;
 449 /*              if (attr & ATTR_REPARSE)  */
 450                 /* We no longer handle these as symlinks because we could not
 451                    follow them due to the absolute path with drive letter */
 452                 if (attr & ATTR_DIRECTORY) {
 453                 /* override default perms since we do not do byte range locking
 454                    on dirs */
 455                         inode->i_mode = cifs_sb->mnt_dir_mode;
 456                         inode->i_mode |= S_IFDIR;
 457                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 458                            (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
 459                            /* No need to le64 convert size of zero */
 460                            (pfindData->EndOfFile == 0)) {
 461                         inode->i_mode = cifs_sb->mnt_file_mode;
 462                         inode->i_mode |= S_IFIFO;
 463 /* BB Finish for SFU style symlinks and devices */
 464                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 465                            (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
 466                         if (decode_sfu_inode(inode,
 467                                          le64_to_cpu(pfindData->EndOfFile),
 468                                          search_path,
 469                                          cifs_sb, xid)) {
 470                                 cFYI(1,("Unrecognized sfu inode type"));
 471                         }
 472                         cFYI(1,("sfu mode 0%o",inode->i_mode));
 473                 } else {
 474                         inode->i_mode |= S_IFREG;
 475                         /* treat the dos attribute of read-only as read-only
 476                            mode e.g. 555 */
 477                         if (cifsInfo->cifsAttrs & ATTR_READONLY)
 478                                 inode->i_mode &= ~(S_IWUGO);
 479                 /* BB add code here -
 480                    validate if device or weird share or device type? */
 481                 }
 482                 if (is_size_safe_to_change(cifsInfo)) {
 483                         /* can not safely change the file size here if the
 484                            client is writing to it due to potential races */
 485                         i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));
 486
 487                         /* 512 bytes (2**9) is the fake blocksize that must be
 488                            used for this calculation */
 489                         inode->i_blocks = (512 - 1 + le64_to_cpu(
 490                                            pfindData->AllocationSize)) >> 9;
 491                 }
 492
 493                 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 494
 495                 /* BB fill in uid and gid here? with help from winbind?
 496                    or retrieve from NTFS stream extended attribute */
 497                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 498                         /* fill in uid, gid, mode from server ACL */
 499                         get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
 500                 } else if (atomic_read(&cifsInfo->inUse) == 0) {
 501                         inode->i_uid = cifs_sb->mnt_uid;
 502                         inode->i_gid = cifs_sb->mnt_gid;
 503                         /* set so we do not keep refreshing these fields with
 504                            bad data after user has changed them in memory */
 505                         atomic_set(&cifsInfo->inUse,1);
 506                 }
 507
 508                 if (S_ISREG(inode->i_mode)) {
 509                         cFYI(1, ("File inode"));
 510                         inode->i_op = &cifs_file_inode_ops;
 511                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 512                                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 513                                         inode->i_fop =
 514                                                 &cifs_file_direct_nobrl_ops;
 515                                 else
 516                                         inode->i_fop = &cifs_file_direct_ops;
 517                         } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 518                                 inode->i_fop = &cifs_file_nobrl_ops;
 519                         else /* not direct, send byte range locks */
 520                                 inode->i_fop = &cifs_file_ops;
 521
 522                         inode->i_data.a_ops = &cifs_addr_ops;
 523                         if(pTcon->ses->server->maxBuf <
 524                              4096 + MAX_CIFS_HDR_SIZE)
 525                                 inode->i_data.a_ops->readpages = NULL;
 526                 } else if (S_ISDIR(inode->i_mode)) {
 527                         cFYI(1, ("Directory inode"));
 528                         inode->i_op = &cifs_dir_inode_ops;
 529                         inode->i_fop = &cifs_dir_ops;
 530                 } else if (S_ISLNK(inode->i_mode)) {
 531                         cFYI(1, ("Symbolic Link inode"));
 532                         inode->i_op = &cifs_symlink_inode_ops;
 533                 } else {
 534                         init_special_inode(inode, inode->i_mode,
 535                                            inode->i_rdev);
 536                 }
 537         }
 538         kfree(buf);
 539         return rc;
 540 }
 541
 542 /* gets root inode */
 543 void cifs_read_inode(struct inode *inode)
 544 {
 545         int xid;
 546         struct cifs_sb_info *cifs_sb;
 547
 548         cifs_sb = CIFS_SB(inode->i_sb);
 549         xid = GetXid();
 550         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
 551                 cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
 552         else
 553                 cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
 554         /* can not call macro FreeXid here since in a void func */
 555         _FreeXid(xid);
 556 }
 557
 558 int cifs_unlink(struct inode *inode, struct dentry *direntry)
 559 {
 560         int rc = 0;
 561         int xid;
 562         struct cifs_sb_info *cifs_sb;
 563         struct cifsTconInfo *pTcon;
 564         char *full_path = NULL;
 565         struct cifsInodeInfo *cifsInode;
 566         FILE_BASIC_INFO *pinfo_buf;
 567
 568         cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
 569
 570         xid = GetXid();
 571
 572         if(inode)
 573                 cifs_sb = CIFS_SB(inode->i_sb);
 574         else
 575                 cifs_sb = CIFS_SB(direntry->d_sb);
 576         pTcon = cifs_sb->tcon;
 577
 578         /* Unlink can be called from rename so we can not grab the sem here
 579            since we deadlock otherwise */
 580 /*      down(&direntry->d_sb->s_vfs_rename_sem);*/
 581         full_path = build_path_from_dentry(direntry);
 582 /*      up(&direntry->d_sb->s_vfs_rename_sem);*/
 583         if (full_path == NULL) {
 584                 FreeXid(xid);
 585                 return -ENOMEM;
 586         }
 587         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
 588                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 589
 590         if (!rc) {
 591                 if (direntry->d_inode)
 592                         direntry->d_inode->i_nlink--;
 593         } else if (rc == -ENOENT) {
 594                 d_drop(direntry);
 595         } else if (rc == -ETXTBSY) {
 596                 int oplock = FALSE;
 597                 __u16 netfid;
 598
 599                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
 600                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
 601                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
 602                                  cifs_sb->mnt_cifs_flags &
 603                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 604                 if (rc==0) {
 605                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
 606                                               cifs_sb->local_nls,
 607                                               cifs_sb->mnt_cifs_flags &
 608                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 609                         CIFSSMBClose(xid, pTcon, netfid);
 610                         if (direntry->d_inode)
 611                                 direntry->d_inode->i_nlink--;
 612                 }
 613         } else if (rc == -EACCES) {
 614                 /* try only if r/o attribute set in local lookup data? */
 615                 pinfo_buf = kmalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
 616                 if (pinfo_buf) {
 617                         memset(pinfo_buf, 0, sizeof(FILE_BASIC_INFO));
 618                         /* ATTRS set to normal clears r/o bit */
 619                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
 620                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
 621                                 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
 622                                                      pinfo_buf,
 623                                                      cifs_sb->local_nls,
 624                                                      cifs_sb->mnt_cifs_flags &
 625                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 626                         else
 627                                 rc = -EOPNOTSUPP;
 628
 629                         if (rc == -EOPNOTSUPP) {
 630                                 int oplock = FALSE;
 631                                 __u16 netfid;
 632                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
 633                                                           full_path,
 634                                                           (__u16)ATTR_NORMAL,
 635                                                           cifs_sb->local_nls);
 636                            For some strange reason it seems that NT4 eats the
 637                            old setattr call without actually setting the
 638                            attributes so on to the third attempted workaround
 639                            */
 640
 641                         /* BB could scan to see if we already have it open
 642                            and pass in pid of opener to function */
 643                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 644                                                  FILE_OPEN, SYNCHRONIZE |
 645                                                  FILE_WRITE_ATTRIBUTES, 0,
 646                                                  &netfid, &oplock, NULL,
 647                                                  cifs_sb->local_nls,
 648                                                  cifs_sb->mnt_cifs_flags &
 649                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 650                                 if (rc==0) {
 651                                         rc = CIFSSMBSetFileTimes(xid, pTcon,
 652                                                                  pinfo_buf,
 653                                                                  netfid);
 654                                         CIFSSMBClose(xid, pTcon, netfid);
 655                                 }
 656                         }
 657                         kfree(pinfo_buf);
 658                 }
 659                 if (rc==0) {
 660                         rc = CIFSSMBDelFile(xid, pTcon, full_path,
 661                                             cifs_sb->local_nls,
 662                                             cifs_sb->mnt_cifs_flags &
 663                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 664                         if (!rc) {
 665                                 if (direntry->d_inode)
 666                                         direntry->d_inode->i_nlink--;
 667                         } else if (rc == -ETXTBSY) {
 668                                 int oplock = FALSE;
 669                                 __u16 netfid;
 670
 671                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 672                                                  FILE_OPEN, DELETE,
 673                                                  CREATE_NOT_DIR |
 674                                                  CREATE_DELETE_ON_CLOSE,
 675                                                  &netfid, &oplock, NULL,
 676                                                  cifs_sb->local_nls,
 677                                                  cifs_sb->mnt_cifs_flags &
 678                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 679                                 if (rc==0) {
 680                                         CIFSSMBRenameOpenFile(xid, pTcon,
 681                                                 netfid, NULL,
 682                                                 cifs_sb->local_nls,
 683                                                 cifs_sb->mnt_cifs_flags &
 684                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 685                                         CIFSSMBClose(xid, pTcon, netfid);
 686                                         if (direntry->d_inode)
 687                                                 direntry->d_inode->i_nlink--;
 688                                 }
 689                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
 690                         }
 691                 }
 692         }
 693         if (direntry->d_inode) {
 694                 cifsInode = CIFS_I(direntry->d_inode);
 695                 cifsInode->time = 0;    /* will force revalidate to get info
 696                                            when needed */
 697                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
 698         }
 699         if(inode) {
 700                 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
 701                 cifsInode = CIFS_I(inode);
 702                 cifsInode->time = 0;    /* force revalidate of dir as well */
 703         }
 704
 705         kfree(full_path);
 706         FreeXid(xid);
 707         return rc;
 708 }
 709
 710 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 711 {
 712         int rc = 0;
 713         int xid;
 714         struct cifs_sb_info *cifs_sb;
 715         struct cifsTconInfo *pTcon;
 716         char *full_path = NULL;
 717         struct inode *newinode = NULL;
 718
 719         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 720
 721         xid = GetXid();
 722
 723         cifs_sb = CIFS_SB(inode->i_sb);
 724         pTcon = cifs_sb->tcon;
 725
 726         down(&inode->i_sb->s_vfs_rename_sem);
 727         full_path = build_path_from_dentry(direntry);
 728         up(&inode->i_sb->s_vfs_rename_sem);
 729         if (full_path == NULL) {
 730                 FreeXid(xid);
 731                 return -ENOMEM;
 732         }
 733         /* BB add setting the equivalent of mode via CreateX w/ACLs */
 734         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
 735                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 736         if (rc) {
 737                 cFYI(1, ("cifs_mkdir returned 0x%x ", rc));
 738                 d_drop(direntry);
 739         } else {
 740                 inode->i_nlink++;
 741                 if (pTcon->ses->capabilities & CAP_UNIX)
 742                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 743                                                       inode->i_sb,xid);
 744                 else
 745                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 746                                                  inode->i_sb,xid);
 747
 748                 if (pTcon->nocase)
 749                         direntry->d_op = &cifs_ci_dentry_ops;
 750                 else
 751                         direntry->d_op = &cifs_dentry_ops;
 752                 d_instantiate(direntry, newinode);
 753                 if (direntry->d_inode)
 754                         direntry->d_inode->i_nlink = 2;
 755                 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
 756                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 757                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 758                                                     mode,
 759                                                     (__u64)current->fsuid,
 760                                                     (__u64)current->fsgid,
 761                                                     0 /* dev_t */,
 762                                                     cifs_sb->local_nls,
 763                                                     cifs_sb->mnt_cifs_flags &
 764                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 765                         } else {
 766                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 767                                                     mode, (__u64)-1,
 768                                                     (__u64)-1, 0 /* dev_t */,
 769                                                     cifs_sb->local_nls,
 770                                                     cifs_sb->mnt_cifs_flags &
 771                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 772                         }
 773                 else {
 774                         /* BB to be implemented via Windows secrty descriptors
 775                            eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
 776                                                  -1, -1, local_nls); */
 777                         if(direntry->d_inode) {
 778                                 direntry->d_inode->i_mode = mode;
 779                                 direntry->d_inode->i_mode |= S_IFDIR;
 780                                 if(cifs_sb->mnt_cifs_flags &
 781                                      CIFS_MOUNT_SET_UID) {
 782                                         direntry->d_inode->i_uid =
 783                                                 current->fsuid;
 784                                         direntry->d_inode->i_gid =
 785                                                 current->fsgid;
 786                                 }
 787                         }
 788                 }
 789         }
 790         kfree(full_path);
 791         FreeXid(xid);
 792         return rc;
 793 }
 794
 795 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 796 {
 797         int rc = 0;
 798         int xid;
 799         struct cifs_sb_info *cifs_sb;
 800         struct cifsTconInfo *pTcon;
 801         char *full_path = NULL;
 802         struct cifsInodeInfo *cifsInode;
 803
 804         cFYI(1, ("cifs_rmdir, inode = 0x%p with ", inode));
 805
 806         xid = GetXid();
 807
 808         cifs_sb = CIFS_SB(inode->i_sb);
 809         pTcon = cifs_sb->tcon;
 810
 811         down(&inode->i_sb->s_vfs_rename_sem);
 812         full_path = build_path_from_dentry(direntry);
 813         up(&inode->i_sb->s_vfs_rename_sem);
 814         if (full_path == NULL) {
 815                 FreeXid(xid);
 816                 return -ENOMEM;
 817         }
 818
 819         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
 820                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 821
 822         if (!rc) {
 823                 inode->i_nlink--;
 824                 i_size_write(direntry->d_inode,0);
 825                 direntry->d_inode->i_nlink = 0;
 826         }
 827
 828         cifsInode = CIFS_I(direntry->d_inode);
 829         cifsInode->time = 0;    /* force revalidate to go get info when
 830                                    needed */
 831         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
 832                 current_fs_time(inode->i_sb);
 833
 834         kfree(full_path);
 835         FreeXid(xid);
 836         return rc;
 837 }
 838
 839 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
 840         struct inode *target_inode, struct dentry *target_direntry)
 841 {
 842         char *fromName;
 843         char *toName;
 844         struct cifs_sb_info *cifs_sb_source;
 845         struct cifs_sb_info *cifs_sb_target;
 846         struct cifsTconInfo *pTcon;
 847         int xid;
 848         int rc = 0;
 849
 850         xid = GetXid();
 851
 852         cifs_sb_target = CIFS_SB(target_inode->i_sb);
 853         cifs_sb_source = CIFS_SB(source_inode->i_sb);
 854         pTcon = cifs_sb_source->tcon;
 855
 856         if (pTcon != cifs_sb_target->tcon) {
 857                 FreeXid(xid);
 858                 return -EXDEV;  /* BB actually could be allowed if same server,
 859                                    but different share.
 860                                    Might eventually add support for this */
 861         }
 862
 863         /* we already  have the rename sem so we do not need to grab it again
 864            here to protect the path integrity */
 865         fromName = build_path_from_dentry(source_direntry);
 866         toName = build_path_from_dentry(target_direntry);
 867         if ((fromName == NULL) || (toName == NULL)) {
 868                 rc = -ENOMEM;
 869                 goto cifs_rename_exit;
 870         }
 871
 872         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
 873                            cifs_sb_source->local_nls,
 874                            cifs_sb_source->mnt_cifs_flags &
 875                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 876         if (rc == -EEXIST) {
 877                 /* check if they are the same file because rename of hardlinked
 878                    files is a noop */
 879                 FILE_UNIX_BASIC_INFO *info_buf_source;
 880                 FILE_UNIX_BASIC_INFO *info_buf_target;
 881
 882                 info_buf_source =
 883                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 884                 if (info_buf_source != NULL) {
 885                         info_buf_target = info_buf_source + 1;
 886                         if (pTcon->ses->capabilities & CAP_UNIX)
 887                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
 888                                         info_buf_source,
 889                                         cifs_sb_source->local_nls,
 890                                         cifs_sb_source->mnt_cifs_flags &
 891                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 892                         /* else rc is still EEXIST so will fall through to
 893                            unlink the target and retry rename */
 894                         if (rc == 0) {
 895                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
 896                                                 info_buf_target,
 897                                                 cifs_sb_target->local_nls,
 898                                                 /* remap based on source sb */
 899                                                 cifs_sb_source->mnt_cifs_flags &
 900                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 901                         }
 902                         if ((rc == 0) &&
 903                             (info_buf_source->UniqueId ==
 904                              info_buf_target->UniqueId)) {
 905                         /* do not rename since the files are hardlinked which
 906                            is a noop */
 907                         } else {
 908                         /* we either can not tell the files are hardlinked
 909                            (as with Windows servers) or files are not
 910                            hardlinked so delete the target manually before
 911                            renaming to follow POSIX rather than Windows
 912                            semantics */
 913                                 cifs_unlink(target_inode, target_direntry);
 914                                 rc = CIFSSMBRename(xid, pTcon, fromName,
 915                                                    toName,
 916                                                    cifs_sb_source->local_nls,
 917                                                    cifs_sb_source->mnt_cifs_flags
 918                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
 919                         }
 920                         kfree(info_buf_source);
 921                 } /* if we can not get memory just leave rc as EEXIST */
 922         }
 923
 924         if (rc) {
 925                 cFYI(1, ("rename rc %d", rc));
 926         }
 927
 928         if ((rc == -EIO) || (rc == -EEXIST)) {
 929                 int oplock = FALSE;
 930                 __u16 netfid;
 931
 932                 /* BB FIXME Is Generic Read correct for rename? */
 933                 /* if renaming directory - we should not say CREATE_NOT_DIR,
 934                    need to test renaming open directory, also GENERIC_READ
 935                    might not right be right access to request */
 936                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
 937                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
 938                                  cifs_sb_source->local_nls,
 939                                  cifs_sb_source->mnt_cifs_flags &
 940                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 941                 if (rc==0) {
 942                         rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
 943                                               cifs_sb_source->local_nls,
 944                                               cifs_sb_source->mnt_cifs_flags &
 945                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 946                         CIFSSMBClose(xid, pTcon, netfid);
 947                 }
 948         }
 949
 950 cifs_rename_exit:
 951         kfree(fromName);
 952         kfree(toName);
 953         FreeXid(xid);
 954         return rc;
 955 }
 956
 957 int cifs_revalidate(struct dentry *direntry)
 958 {
 959         int xid;
 960         int rc = 0;
 961         char *full_path;
 962         struct cifs_sb_info *cifs_sb;
 963         struct cifsInodeInfo *cifsInode;
 964         loff_t local_size;
 965         struct timespec local_mtime;
 966         int invalidate_inode = FALSE;
 967
 968         if (direntry->d_inode == NULL)
 969                 return -ENOENT;
 970
 971         cifsInode = CIFS_I(direntry->d_inode);
 972
 973         if (cifsInode == NULL)
 974                 return -ENOENT;
 975
 976         /* no sense revalidating inode info on file that no one can write */
 977         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
 978                 return rc;
 979
 980         xid = GetXid();
 981
 982         cifs_sb = CIFS_SB(direntry->d_sb);
 983
 984         /* can not safely grab the rename sem here if rename calls revalidate
 985            since that would deadlock */
 986         full_path = build_path_from_dentry(direntry);
 987         if (full_path == NULL) {
 988                 FreeXid(xid);
 989                 return -ENOMEM;
 990         }
 991         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
 992                  "jiffies %ld", full_path, direntry->d_inode,
 993                  direntry->d_inode->i_count.counter, direntry,
 994                  direntry->d_time, jiffies));
 995
 996         if (cifsInode->time == 0) {
 997                 /* was set to zero previously to force revalidate */
 998         } else if (time_before(jiffies, cifsInode->time + HZ) &&
 999                    lookupCacheEnabled) {
1000                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1001                     (direntry->d_inode->i_nlink == 1)) {
1002                         kfree(full_path);
1003                         FreeXid(xid);
1004                         return rc;
1005                 } else {
1006                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1007                 }
1008         }
1009
1010         /* save mtime and size */
1011         local_mtime = direntry->d_inode->i_mtime;
1012         local_size = direntry->d_inode->i_size;
1013
1014         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
1015                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1016                                               direntry->d_sb,xid);
1017                 if (rc) {
1018                         cFYI(1, ("error on getting revalidate info %d", rc));
1019 /*                      if (rc != -ENOENT)
1020                                 rc = 0; */      /* BB should we cache info on
1021                                                    certain errors? */
1022                 }
1023         } else {
1024                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1025                                          direntry->d_sb,xid);
1026                 if (rc) {
1027                         cFYI(1, ("error on getting revalidate info %d", rc));
1028 /*                      if (rc != -ENOENT)
1029                                 rc = 0; */      /* BB should we cache info on
1030                                                    certain errors? */
1031                 }
1032         }
1033         /* should we remap certain errors, access denied?, to zero */
1034
1035         /* if not oplocked, we invalidate inode pages if mtime or file size
1036            had changed on server */
1037
1038         if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) &&
1039             (local_size == direntry->d_inode->i_size)) {
1040                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1041         } else {
1042                 /* file may have changed on server */
1043                 if (cifsInode->clientCanCacheRead) {
1044                         /* no need to invalidate inode pages since we were the
1045                            only ones who could have modified the file and the
1046                            server copy is staler than ours */
1047                 } else {
1048                         invalidate_inode = TRUE;
1049                 }
1050         }
1051
1052         /* can not grab this sem since kernel filesys locking documentation
1053            indicates i_mutex may be taken by the kernel on lookup and rename
1054            which could deadlock if we grab the i_mutex here as well */
1055 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1056         /* need to write out dirty pages here  */
1057         if (direntry->d_inode->i_mapping) {
1058                 /* do we need to lock inode until after invalidate completes
1059                    below? */
1060                 filemap_fdatawrite(direntry->d_inode->i_mapping);
1061         }
1062         if (invalidate_inode) {
1063         /* shrink_dcache not necessary now that cifs dentry ops
1064         are exported for negative dentries */
1065 /*              if(S_ISDIR(direntry->d_inode->i_mode))
1066                         shrink_dcache_parent(direntry); */
1067                 if (S_ISREG(direntry->d_inode->i_mode)) {
1068                         if (direntry->d_inode->i_mapping)
1069                                 filemap_fdatawait(direntry->d_inode->i_mapping);
1070                         /* may eventually have to do this for open files too */
1071                         if (list_empty(&(cifsInode->openFileList))) {
1072                                 /* changed on server - flush read ahead pages */
1073                                 cFYI(1, ("Invalidating read ahead data on "
1074                                          "closed file"));
1075                                 invalidate_remote_inode(direntry->d_inode);
1076                         }
1077                 }
1078         }
1079 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1080
1081         kfree(full_path);
1082         FreeXid(xid);
1083         return rc;
1084 }
1085
1086 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1087         struct kstat *stat)
1088 {
1089         int err = cifs_revalidate(dentry);
1090         if (!err)
1091                 generic_fillattr(dentry->d_inode, stat);
1092         return err;
1093 }
1094
1095 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1096 {
1097         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1098         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1099         struct page *page;
1100         char *kaddr;
1101         int rc = 0;
1102
1103         page = grab_cache_page(mapping, index);
1104         if (!page)
1105                 return -ENOMEM;
1106
1107         kaddr = kmap_atomic(page, KM_USER0);
1108         memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1109         flush_dcache_page(page);
1110         kunmap_atomic(kaddr, KM_USER0);
1111         unlock_page(page);
1112         page_cache_release(page);
1113         return rc;
1114 }
1115
1116 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1117 {
1118         int xid;
1119         struct cifs_sb_info *cifs_sb;
1120         struct cifsTconInfo *pTcon;
1121         char *full_path = NULL;
1122         int rc = -EACCES;
1123         struct cifsFileInfo *open_file = NULL;
1124         FILE_BASIC_INFO time_buf;
1125         int set_time = FALSE;
1126         __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1127         __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1128         __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1129         struct cifsInodeInfo *cifsInode;
1130
1131         xid = GetXid();
1132
1133         cFYI(1, ("In cifs_setattr, name = %s attrs->iavalid 0x%x ",
1134                  direntry->d_name.name, attrs->ia_valid));
1135
1136         cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1137         pTcon = cifs_sb->tcon;
1138
1139         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1140                 /* check if we have permission to change attrs */
1141                 rc = inode_change_ok(direntry->d_inode, attrs);
1142                 if(rc < 0) {
1143                         FreeXid(xid);
1144                         return rc;
1145                 } else
1146                         rc = 0;
1147         }
1148
1149         down(&direntry->d_sb->s_vfs_rename_sem);
1150         full_path = build_path_from_dentry(direntry);
1151         up(&direntry->d_sb->s_vfs_rename_sem);
1152         if (full_path == NULL) {
1153                 FreeXid(xid);
1154                 return -ENOMEM;
1155         }
1156         cifsInode = CIFS_I(direntry->d_inode);
1157
1158         /* BB check if we need to refresh inode from server now ? BB */
1159
1160         /* need to flush data before changing file size on server */
1161         filemap_write_and_wait(direntry->d_inode->i_mapping);
1162
1163         if (attrs->ia_valid & ATTR_SIZE) {
1164                 /* To avoid spurious oplock breaks from server, in the case of
1165                    inodes that we already have open, avoid doing path based
1166                    setting of file size if we can do it by handle.
1167                    This keeps our caching token (oplock) and avoids timeouts
1168                    when the local oplock break takes longer to flush
1169                    writebehind data than the SMB timeout for the SetPathInfo
1170                    request would allow */
1171                 open_file = find_writable_file(cifsInode);
1172                 if (open_file) {
1173                         __u16 nfid = open_file->netfid;
1174                         __u32 npid = open_file->pid;
1175                         rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1176                                                 nfid, npid, FALSE);
1177                         atomic_dec(&open_file->wrtPending);
1178                         cFYI(1,("SetFSize for attrs rc = %d", rc));
1179                         if(rc == -EINVAL) {
1180                                 int bytes_written;
1181                                 rc = CIFSSMBWrite(xid, pTcon,
1182                                                   nfid, 0, attrs->ia_size,
1183                                                   &bytes_written, NULL, NULL,
1184                                                   1 /* 45 seconds */);
1185                                 cFYI(1,("Wrt seteof rc %d", rc));
1186                         }
1187                 } else
1188                         rc = -EINVAL;
1189
1190                 if (rc != 0) {
1191                         /* Set file size by pathname rather than by handle
1192                            either because no valid, writeable file handle for
1193                            it was found or because there was an error setting
1194                            it by handle */
1195                         rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1196                                            attrs->ia_size, FALSE,
1197                                            cifs_sb->local_nls,
1198                                            cifs_sb->mnt_cifs_flags &
1199                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1200                         cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1201                         if(rc == -EINVAL) {
1202                                 __u16 netfid;
1203                                 int oplock = FALSE;
1204
1205                                 rc = SMBLegacyOpen(xid, pTcon, full_path,
1206                                         FILE_OPEN,
1207                                         SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1208                                         CREATE_NOT_DIR, &netfid, &oplock,
1209                                         NULL, cifs_sb->local_nls,
1210                                         cifs_sb->mnt_cifs_flags &
1211                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1212                                 if (rc==0) {
1213                                         int bytes_written;
1214                                         rc = CIFSSMBWrite(xid, pTcon,
1215                                                         netfid, 0,
1216                                                         attrs->ia_size,
1217                                                         &bytes_written, NULL,
1218                                                         NULL, 1 /* 45 sec */);
1219                                         cFYI(1,("wrt seteof rc %d",rc));
1220                                         CIFSSMBClose(xid, pTcon, netfid);
1221                                 }
1222
1223                         }
1224                 }
1225
1226                 /* Server is ok setting allocation size implicitly - no need
1227                    to call:
1228                 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1229                          cifs_sb->local_nls);
1230                    */
1231
1232                 if (rc == 0) {
1233                         rc = vmtruncate(direntry->d_inode, attrs->ia_size);
1234                         cifs_truncate_page(direntry->d_inode->i_mapping,
1235                                            direntry->d_inode->i_size);
1236                 } else
1237                         goto cifs_setattr_exit;
1238         }
1239         if (attrs->ia_valid & ATTR_UID) {
1240                 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1241                 uid = attrs->ia_uid;
1242         }
1243         if (attrs->ia_valid & ATTR_GID) {
1244                 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1245                 gid = attrs->ia_gid;
1246         }
1247
1248         time_buf.Attributes = 0;
1249         if (attrs->ia_valid & ATTR_MODE) {
1250                 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1251                 mode = attrs->ia_mode;
1252         }
1253
1254         if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1255             && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1256                 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1257                                          0 /* dev_t */, cifs_sb->local_nls,
1258                                          cifs_sb->mnt_cifs_flags &
1259                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1260         else if (attrs->ia_valid & ATTR_MODE) {
1261                 rc = 0;
1262                 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1263                         if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0)
1264                                 time_buf.Attributes =
1265                                         cpu_to_le32(cifsInode->cifsAttrs |
1266                                                     ATTR_READONLY);
1267                 } else if ((mode & S_IWUGO) == S_IWUGO) {
1268                         if (cifsInode->cifsAttrs & ATTR_READONLY)
1269                                 time_buf.Attributes =
1270                                         cpu_to_le32(cifsInode->cifsAttrs &
1271                                                     (~ATTR_READONLY));
1272                 }
1273                 /* BB to be implemented -
1274                    via Windows security descriptors or streams */
1275                 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1276                                       cifs_sb->local_nls); */
1277         }
1278
1279         if (attrs->ia_valid & ATTR_ATIME) {
1280                 set_time = TRUE;
1281                 time_buf.LastAccessTime =
1282                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1283         } else
1284                 time_buf.LastAccessTime = 0;
1285
1286         if (attrs->ia_valid & ATTR_MTIME) {
1287                 set_time = TRUE;
1288                 time_buf.LastWriteTime =
1289                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1290         } else
1291                 time_buf.LastWriteTime = 0;
1292         /* Do not set ctime explicitly unless other time
1293            stamps are changed explicitly (i.e. by utime()
1294            since we would then have a mix of client and
1295            server times */
1296
1297         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1298                 set_time = TRUE;
1299                 /* Although Samba throws this field away
1300                 it may be useful to Windows - but we do
1301                 not want to set ctime unless some other
1302                 timestamp is changing */
1303                 cFYI(1, ("CIFS - CTIME changed "));
1304                 time_buf.ChangeTime =
1305                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1306         } else
1307                 time_buf.ChangeTime = 0;
1308
1309         if (set_time || time_buf.Attributes) {
1310                 time_buf.CreationTime = 0;      /* do not change */
1311                 /* In the future we should experiment - try setting timestamps
1312                    via Handle (SetFileInfo) instead of by path */
1313                 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1314                         rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1315                                              cifs_sb->local_nls,
1316                                              cifs_sb->mnt_cifs_flags &
1317                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1318                 else
1319                         rc = -EOPNOTSUPP;
1320
1321                 if (rc == -EOPNOTSUPP) {
1322                         int oplock = FALSE;
1323                         __u16 netfid;
1324
1325                         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1326                                  "times not supported by this server"));
1327                         /* BB we could scan to see if we already have it open
1328                            and pass in pid of opener to function */
1329                         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1330                                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1331                                          CREATE_NOT_DIR, &netfid, &oplock,
1332                                          NULL, cifs_sb->local_nls,
1333                                          cifs_sb->mnt_cifs_flags &
1334                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1335                         if (rc==0) {
1336                                 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1337                                                          netfid);
1338                                 CIFSSMBClose(xid, pTcon, netfid);
1339                         } else {
1340                         /* BB For even older servers we could convert time_buf
1341                            into old DOS style which uses two second
1342                            granularity */
1343
1344                         /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1345                                         &time_buf, cifs_sb->local_nls); */
1346                         }
1347                 }
1348                 /* Even if error on time set, no sense failing the call if
1349                 the server would set the time to a reasonable value anyway,
1350                 and this check ensures that we are not being called from
1351                 sys_utimes in which case we ought to fail the call back to
1352                 the user when the server rejects the call */
1353                 if((rc) && (attrs->ia_valid &&
1354                          (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1355                         rc = 0;
1356         }
1357
1358         /* do not need local check to inode_check_ok since the server does
1359            that */
1360         if (!rc)
1361                 rc = inode_setattr(direntry->d_inode, attrs);
1362 cifs_setattr_exit:
1363         kfree(full_path);
1364         FreeXid(xid);
1365         return rc;
1366 }
1367
1368 void cifs_delete_inode(struct inode *inode)
1369 {
1370         cFYI(1, ("In cifs_delete_inode, inode = 0x%p ", inode));
1371         /* may have to add back in if and when safe distributed caching of
1372            directories added e.g. via FindNotify */
1373 }