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