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   1 /*
   2  *   fs/cifs/inode.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2007
   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/stat.h>
  23 #include <linux/pagemap.h>
  24 #include <asm/div64.h>
  25 #include "cifsfs.h"
  26 #include "cifspdu.h"
  27 #include "cifsglob.h"
  28 #include "cifsproto.h"
  29 #include "cifs_debug.h"
  30 #include "cifs_fs_sb.h"
  31
  32
  33 static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
  34 {
  35         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  36
  37         switch (inode->i_mode & S_IFMT) {
  38         case S_IFREG:
  39                 inode->i_op = &cifs_file_inode_ops;
  40                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
  41                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  42                                 inode->i_fop = &cifs_file_direct_nobrl_ops;
  43                         else
  44                                 inode->i_fop = &cifs_file_direct_ops;
  45                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  46                         inode->i_fop = &cifs_file_nobrl_ops;
  47                 else { /* not direct, send byte range locks */
  48                         inode->i_fop = &cifs_file_ops;
  49                 }
  50
  51
  52                 /* check if server can support readpages */
  53                 if (cifs_sb->tcon->ses->server->maxBuf <
  54                                 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
  55                         inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
  56                 else
  57                         inode->i_data.a_ops = &cifs_addr_ops;
  58                 break;
  59         case S_IFDIR:
  60 #ifdef CONFIG_CIFS_DFS_UPCALL
  61                 if (is_dfs_referral) {
  62                         inode->i_op = &cifs_dfs_referral_inode_operations;
  63                 } else {
  64 #else /* NO DFS support, treat as a directory */
  65                 {
  66 #endif
  67                         inode->i_op = &cifs_dir_inode_ops;
  68                         inode->i_fop = &cifs_dir_ops;
  69                 }
  70                 break;
  71         case S_IFLNK:
  72                 inode->i_op = &cifs_symlink_inode_ops;
  73                 break;
  74         default:
  75                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  76                 break;
  77         }
  78 }
  79
  80 static void cifs_unix_info_to_inode(struct inode *inode,
  81                 FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
  82 {
  83         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  84         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
  85         __u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
  86         __u64 end_of_file = le64_to_cpu(info->EndOfFile);
  87
  88         inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(info->LastAccessTime));
  89         inode->i_mtime =
  90                 cifs_NTtimeToUnix(le64_to_cpu(info->LastModificationTime));
  91         inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(info->LastStatusChange));
  92         inode->i_mode = le64_to_cpu(info->Permissions);
  93
  94         /*
  95          * Since we set the inode type below we need to mask off
  96          * to avoid strange results if bits set above.
  97          */
  98         inode->i_mode &= ~S_IFMT;
  99         switch (le32_to_cpu(info->Type)) {
 100         case UNIX_FILE:
 101                 inode->i_mode |= S_IFREG;
 102                 break;
 103         case UNIX_SYMLINK:
 104                 inode->i_mode |= S_IFLNK;
 105                 break;
 106         case UNIX_DIR:
 107                 inode->i_mode |= S_IFDIR;
 108                 break;
 109         case UNIX_CHARDEV:
 110                 inode->i_mode |= S_IFCHR;
 111                 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 112                                       le64_to_cpu(info->DevMinor) & MINORMASK);
 113                 break;
 114         case UNIX_BLOCKDEV:
 115                 inode->i_mode |= S_IFBLK;
 116                 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 117                                       le64_to_cpu(info->DevMinor) & MINORMASK);
 118                 break;
 119         case UNIX_FIFO:
 120                 inode->i_mode |= S_IFIFO;
 121                 break;
 122         case UNIX_SOCKET:
 123                 inode->i_mode |= S_IFSOCK;
 124                 break;
 125         default:
 126                 /* safest to call it a file if we do not know */
 127                 inode->i_mode |= S_IFREG;
 128                 cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
 129                 break;
 130         }
 131
 132         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
 133             !force_uid_gid)
 134                 inode->i_uid = cifs_sb->mnt_uid;
 135         else
 136                 inode->i_uid = le64_to_cpu(info->Uid);
 137
 138         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
 139             !force_uid_gid)
 140                 inode->i_gid = cifs_sb->mnt_gid;
 141         else
 142                 inode->i_gid = le64_to_cpu(info->Gid);
 143
 144         inode->i_nlink = le64_to_cpu(info->Nlinks);
 145
 146         spin_lock(&inode->i_lock);
 147         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 148                 /*
 149                  * We can not safely change the file size here if the client
 150                  * is writing to it due to potential races.
 151                  */
 152                 i_size_write(inode, end_of_file);
 153
 154                 /*
 155                  * i_blocks is not related to (i_size / i_blksize),
 156                  * but instead 512 byte (2**9) size is required for
 157                  * calculating num blocks.
 158                  */
 159                 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 160         }
 161         spin_unlock(&inode->i_lock);
 162 }
 163
 164
 165 /*
 166  *      Needed to setup inode data for the directory which is the
 167  *      junction to the new submount (ie to setup the fake directory
 168  *      which represents a DFS referral)
 169  */
 170 static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
 171                                struct super_block *sb)
 172 {
 173         struct inode *pinode = NULL;
 174
 175         memset(pfnd_dat, 0, sizeof(FILE_UNIX_BASIC_INFO));
 176
 177 /*      __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
 178         __le64 pfnd_dat->NumOfBytes = cpu_to_le64(0);
 179         __u64 UniqueId = 0;  */
 180         pfnd_dat->LastStatusChange =
 181                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 182         pfnd_dat->LastAccessTime =
 183                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 184         pfnd_dat->LastModificationTime =
 185                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 186         pfnd_dat->Type = cpu_to_le32(UNIX_DIR);
 187         pfnd_dat->Permissions = cpu_to_le64(S_IXUGO | S_IRWXU);
 188         pfnd_dat->Nlinks = cpu_to_le64(2);
 189         if (sb->s_root)
 190                 pinode = sb->s_root->d_inode;
 191         if (pinode == NULL)
 192                 return;
 193
 194         /* fill in default values for the remaining based on root
 195            inode since we can not query the server for this inode info */
 196         pfnd_dat->DevMajor = cpu_to_le64(MAJOR(pinode->i_rdev));
 197         pfnd_dat->DevMinor = cpu_to_le64(MINOR(pinode->i_rdev));
 198         pfnd_dat->Uid = cpu_to_le64(pinode->i_uid);
 199         pfnd_dat->Gid = cpu_to_le64(pinode->i_gid);
 200 }
 201
 202 int cifs_get_inode_info_unix(struct inode **pinode,
 203         const unsigned char *full_path, struct super_block *sb, int xid)
 204 {
 205         int rc = 0;
 206         FILE_UNIX_BASIC_INFO find_data;
 207         struct cifsTconInfo *pTcon;
 208         struct inode *inode;
 209         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 210         bool is_dfs_referral = false;
 211         struct cifsInodeInfo *cifsInfo;
 212         __u64 num_of_bytes;
 213         __u64 end_of_file;
 214
 215         pTcon = cifs_sb->tcon;
 216         cFYI(1, ("Getting info on %s", full_path));
 217
 218         /* could have done a find first instead but this returns more info */
 219         rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &find_data,
 220                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 221                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 222         if (rc) {
 223                 if (rc == -EREMOTE && !is_dfs_referral) {
 224                         is_dfs_referral = true;
 225                         cFYI(DBG2, ("DFS ref"));
 226                         /* for DFS, server does not give us real inode data */
 227                         fill_fake_finddataunix(&find_data, sb);
 228                         rc = 0;
 229                 }
 230         }
 231         num_of_bytes = le64_to_cpu(find_data.NumOfBytes);
 232         end_of_file = le64_to_cpu(find_data.EndOfFile);
 233
 234         /* get new inode */
 235         if (*pinode == NULL) {
 236                 *pinode = new_inode(sb);
 237                 if (*pinode == NULL) {
 238                         rc = -ENOMEM;
 239                 goto cgiiu_exit;
 240                 }
 241                 /* Is an i_ino of zero legal? */
 242                 /* note ino incremented to unique num in new_inode */
 243                 /* Are there sanity checks we can use to ensure that
 244                    the server is really filling in that field? */
 245                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 246                         (*pinode)->i_ino = (unsigned long)find_data.UniqueId;
 247
 248                 if (sb->s_flags & MS_NOATIME)
 249                         (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
 250
 251                 insert_inode_hash(*pinode);
 252         }
 253
 254         inode = *pinode;
 255         cifsInfo = CIFS_I(inode);
 256
 257         cFYI(1, ("Old time %ld", cifsInfo->time));
 258         cifsInfo->time = jiffies;
 259         cFYI(1, ("New time %ld", cifsInfo->time));
 260         /* this is ok to set on every inode revalidate */
 261         atomic_set(&cifsInfo->inUse, 1);
 262
 263         cifs_unix_info_to_inode(inode, &find_data, 0);
 264
 265         if (num_of_bytes < end_of_file)
 266                 cFYI(1, ("allocation size less than end of file"));
 267         cFYI(1, ("Size %ld and blocks %llu",
 268                 (unsigned long) inode->i_size,
 269                 (unsigned long long)inode->i_blocks));
 270
 271         cifs_set_ops(inode, is_dfs_referral);
 272 cgiiu_exit:
 273         return rc;
 274 }
 275
 276 static int decode_sfu_inode(struct inode *inode, __u64 size,
 277                             const unsigned char *path,
 278                             struct cifs_sb_info *cifs_sb, int xid)
 279 {
 280         int rc;
 281         int oplock = 0;
 282         __u16 netfid;
 283         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 284         char buf[24];
 285         unsigned int bytes_read;
 286         char *pbuf;
 287
 288         pbuf = buf;
 289
 290         if (size == 0) {
 291                 inode->i_mode |= S_IFIFO;
 292                 return 0;
 293         } else if (size < 8) {
 294                 return -EINVAL;  /* EOPNOTSUPP? */
 295         }
 296
 297         rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
 298                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 299                          cifs_sb->local_nls,
 300                          cifs_sb->mnt_cifs_flags &
 301                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 302         if (rc == 0) {
 303                 int buf_type = CIFS_NO_BUFFER;
 304                         /* Read header */
 305                 rc = CIFSSMBRead(xid, pTcon,
 306                                  netfid,
 307                                  24 /* length */, 0 /* offset */,
 308                                  &bytes_read, &pbuf, &buf_type);
 309                 if ((rc == 0) && (bytes_read >= 8)) {
 310                         if (memcmp("IntxBLK", pbuf, 8) == 0) {
 311                                 cFYI(1, ("Block device"));
 312                                 inode->i_mode |= S_IFBLK;
 313                                 if (bytes_read == 24) {
 314                                         /* we have enough to decode dev num */
 315                                         __u64 mjr; /* major */
 316                                         __u64 mnr; /* minor */
 317                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 318                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 319                                         inode->i_rdev = MKDEV(mjr, mnr);
 320                                 }
 321                         } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
 322                                 cFYI(1, ("Char device"));
 323                                 inode->i_mode |= S_IFCHR;
 324                                 if (bytes_read == 24) {
 325                                         /* we have enough to decode dev num */
 326                                         __u64 mjr; /* major */
 327                                         __u64 mnr; /* minor */
 328                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 329                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 330                                         inode->i_rdev = MKDEV(mjr, mnr);
 331                                 }
 332                         } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
 333                                 cFYI(1, ("Symlink"));
 334                                 inode->i_mode |= S_IFLNK;
 335                         } else {
 336                                 inode->i_mode |= S_IFREG; /* file? */
 337                                 rc = -EOPNOTSUPP;
 338                         }
 339                 } else {
 340                         inode->i_mode |= S_IFREG; /* then it is a file */
 341                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 342                 }
 343                 CIFSSMBClose(xid, pTcon, netfid);
 344         }
 345         return rc;
 346 }
 347
 348 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 349
 350 static int get_sfu_mode(struct inode *inode,
 351                         const unsigned char *path,
 352                         struct cifs_sb_info *cifs_sb, int xid)
 353 {
 354 #ifdef CONFIG_CIFS_XATTR
 355         ssize_t rc;
 356         char ea_value[4];
 357         __u32 mode;
 358
 359         rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
 360                         ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 361                 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 362         if (rc < 0)
 363                 return (int)rc;
 364         else if (rc > 3) {
 365                 mode = le32_to_cpu(*((__le32 *)ea_value));
 366                 inode->i_mode &= ~SFBITS_MASK;
 367                 cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
 368                 inode->i_mode = (mode &  SFBITS_MASK) | inode->i_mode;
 369                 cFYI(1, ("special mode bits 0%o", mode));
 370                 return 0;
 371         } else {
 372                 return 0;
 373         }
 374 #else
 375         return -EOPNOTSUPP;
 376 #endif
 377 }
 378
 379 /*
 380  *      Needed to setup inode data for the directory which is the
 381  *      junction to the new submount (ie to setup the fake directory
 382  *      which represents a DFS referral)
 383  */
 384 static void fill_fake_finddata(FILE_ALL_INFO *pfnd_dat,
 385                                struct super_block *sb)
 386 {
 387         memset(pfnd_dat, 0, sizeof(FILE_ALL_INFO));
 388
 389 /*      __le64 pfnd_dat->AllocationSize = cpu_to_le64(0);
 390         __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
 391         __u8 pfnd_dat->DeletePending = 0;
 392         __u8 pfnd_data->Directory = 0;
 393         __le32 pfnd_dat->EASize = 0;
 394         __u64 pfnd_dat->IndexNumber = 0;
 395         __u64 pfnd_dat->IndexNumber1 = 0;  */
 396         pfnd_dat->CreationTime =
 397                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 398         pfnd_dat->LastAccessTime =
 399                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 400         pfnd_dat->LastWriteTime =
 401                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 402         pfnd_dat->ChangeTime =
 403                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 404         pfnd_dat->Attributes = cpu_to_le32(ATTR_DIRECTORY);
 405         pfnd_dat->NumberOfLinks = cpu_to_le32(2);
 406 }
 407
 408 int cifs_get_inode_info(struct inode **pinode,
 409         const unsigned char *full_path, FILE_ALL_INFO *pfindData,
 410         struct super_block *sb, int xid, const __u16 *pfid)
 411 {
 412         int rc = 0;
 413         __u32 attr;
 414         struct cifsInodeInfo *cifsInfo;
 415         struct cifsTconInfo *pTcon;
 416         struct inode *inode;
 417         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 418         char *buf = NULL;
 419         bool adjustTZ = false;
 420         bool is_dfs_referral = false;
 421         umode_t default_mode;
 422
 423         pTcon = cifs_sb->tcon;
 424         cFYI(1, ("Getting info on %s", full_path));
 425
 426         if ((pfindData == NULL) && (*pinode != NULL)) {
 427                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 428                         cFYI(1, ("No need to revalidate cached inode sizes"));
 429                         return rc;
 430                 }
 431         }
 432
 433         /* if file info not passed in then get it from server */
 434         if (pfindData == NULL) {
 435                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 436                 if (buf == NULL)
 437                         return -ENOMEM;
 438                 pfindData = (FILE_ALL_INFO *)buf;
 439
 440                 /* could do find first instead but this returns more info */
 441                 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
 442                               0 /* not legacy */,
 443                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 444                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 445                 /* BB optimize code so we do not make the above call
 446                 when server claims no NT SMB support and the above call
 447                 failed at least once - set flag in tcon or mount */
 448                 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 449                         rc = SMBQueryInformation(xid, pTcon, full_path,
 450                                         pfindData, cifs_sb->local_nls,
 451                                         cifs_sb->mnt_cifs_flags &
 452                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 453                         adjustTZ = true;
 454                 }
 455         }
 456         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
 457         if (rc == -EREMOTE) {
 458                 is_dfs_referral = true;
 459                 fill_fake_finddata(pfindData, sb);
 460                 rc = 0;
 461         } else if (rc)
 462                 goto cgii_exit;
 463
 464         attr = le32_to_cpu(pfindData->Attributes);
 465
 466         /* get new inode */
 467         if (*pinode == NULL) {
 468                 *pinode = new_inode(sb);
 469                 if (*pinode == NULL) {
 470                         rc = -ENOMEM;
 471                         goto cgii_exit;
 472                 }
 473                 /* Is an i_ino of zero legal? Can we use that to check
 474                    if the server supports returning inode numbers?  Are
 475                    there other sanity checks we can use to ensure that
 476                    the server is really filling in that field? */
 477
 478                 /* We can not use the IndexNumber field by default from
 479                    Windows or Samba (in ALL_INFO buf) but we can request
 480                    it explicitly.  It may not be unique presumably if
 481                    the server has multiple devices mounted under one share */
 482
 483                 /* There may be higher info levels that work but are
 484                    there Windows server or network appliances for which
 485                    IndexNumber field is not guaranteed unique? */
 486
 487                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 488                         int rc1 = 0;
 489                         __u64 inode_num;
 490
 491                         rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 492                                         full_path, &inode_num,
 493                                         cifs_sb->local_nls,
 494                                         cifs_sb->mnt_cifs_flags &
 495                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 496                         if (rc1) {
 497                                 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
 498                                 /* BB EOPNOSUPP disable SERVER_INUM? */
 499                         } else /* do we need cast or hash to ino? */
 500                                 (*pinode)->i_ino = inode_num;
 501                 } /* else ino incremented to unique num in new_inode*/
 502                 if (sb->s_flags & MS_NOATIME)
 503                         (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
 504                 insert_inode_hash(*pinode);
 505         }
 506         inode = *pinode;
 507         cifsInfo = CIFS_I(inode);
 508         cifsInfo->cifsAttrs = attr;
 509         cFYI(1, ("Old time %ld", cifsInfo->time));
 510         cifsInfo->time = jiffies;
 511         cFYI(1, ("New time %ld", cifsInfo->time));
 512
 513         /* blksize needs to be multiple of two. So safer to default to
 514         blksize and blkbits set in superblock so 2**blkbits and blksize
 515         will match rather than setting to:
 516         (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 517
 518         /* Linux can not store file creation time so ignore it */
 519         if (pfindData->LastAccessTime)
 520                 inode->i_atime = cifs_NTtimeToUnix
 521                         (le64_to_cpu(pfindData->LastAccessTime));
 522         else /* do not need to use current_fs_time - time not stored */
 523                 inode->i_atime = CURRENT_TIME;
 524         inode->i_mtime =
 525                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 526         inode->i_ctime =
 527             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 528         cFYI(DBG2, ("Attributes came in as 0x%x", attr));
 529         if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
 530                 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
 531                 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
 532         }
 533
 534         /* get default inode mode */
 535         if (attr & ATTR_DIRECTORY)
 536                 default_mode = cifs_sb->mnt_dir_mode;
 537         else
 538                 default_mode = cifs_sb->mnt_file_mode;
 539
 540         /* set permission bits */
 541         if (atomic_read(&cifsInfo->inUse) == 0 ||
 542             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
 543                 inode->i_mode = default_mode;
 544         else {
 545                 /* just reenable write bits if !ATTR_READONLY */
 546                 if ((inode->i_mode & S_IWUGO) == 0 &&
 547                     (attr & ATTR_READONLY) == 0)
 548                         inode->i_mode |= (S_IWUGO & default_mode);
 549                         inode->i_mode &= ~S_IFMT;
 550         }
 551         /* clear write bits if ATTR_READONLY is set */
 552         if (attr & ATTR_READONLY)
 553                 inode->i_mode &= ~S_IWUGO;
 554
 555         /* set inode type */
 556         if ((attr & ATTR_SYSTEM) &&
 557             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
 558                 /* no need to fix endianness on 0 */
 559                 if (pfindData->EndOfFile == 0)
 560                         inode->i_mode |= S_IFIFO;
 561                 else if (decode_sfu_inode(inode,
 562                                 le64_to_cpu(pfindData->EndOfFile),
 563                                 full_path, cifs_sb, xid))
 564                         cFYI(1, ("unknown SFU file type\n"));
 565         } else {
 566                 if (attr & ATTR_DIRECTORY)
 567                         inode->i_mode |= S_IFDIR;
 568                 else
 569                         inode->i_mode |= S_IFREG;
 570         }
 571
 572         spin_lock(&inode->i_lock);
 573         if (is_size_safe_to_change(cifsInfo,
 574                                    le64_to_cpu(pfindData->EndOfFile))) {
 575                 /* can not safely shrink the file size here if the
 576                    client is writing to it due to potential races */
 577                 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
 578
 579                 /* 512 bytes (2**9) is the fake blocksize that must be
 580                    used for this calculation */
 581                 inode->i_blocks = (512 - 1 + le64_to_cpu(
 582                                    pfindData->AllocationSize)) >> 9;
 583         }
 584         spin_unlock(&inode->i_lock);
 585
 586         inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 587
 588         /* BB fill in uid and gid here? with help from winbind?
 589            or retrieve from NTFS stream extended attribute */
 590 #ifdef CONFIG_CIFS_EXPERIMENTAL
 591         /* fill in 0777 bits from ACL */
 592         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 593                 cFYI(1, ("Getting mode bits from ACL"));
 594                 acl_to_uid_mode(inode, full_path, pfid);
 595         }
 596 #endif
 597         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 598                 /* fill in remaining high mode bits e.g. SUID, VTX */
 599                 get_sfu_mode(inode, full_path, cifs_sb, xid);
 600         } else if (atomic_read(&cifsInfo->inUse) == 0) {
 601                 inode->i_uid = cifs_sb->mnt_uid;
 602                 inode->i_gid = cifs_sb->mnt_gid;
 603                 /* set so we do not keep refreshing these fields with
 604                    bad data after user has changed them in memory */
 605                 atomic_set(&cifsInfo->inUse, 1);
 606         }
 607
 608         cifs_set_ops(inode, is_dfs_referral);
 609
 610
 611
 612
 613 cgii_exit:
 614         kfree(buf);
 615         return rc;
 616 }
 617
 618 static const struct inode_operations cifs_ipc_inode_ops = {
 619         .lookup = cifs_lookup,
 620 };
 621
 622 /* gets root inode */
 623 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
 624 {
 625         int xid;
 626         struct cifs_sb_info *cifs_sb;
 627         struct inode *inode;
 628         long rc;
 629
 630         inode = iget_locked(sb, ino);
 631         if (!inode)
 632                 return ERR_PTR(-ENOMEM);
 633         if (!(inode->i_state & I_NEW))
 634                 return inode;
 635
 636         cifs_sb = CIFS_SB(inode->i_sb);
 637         xid = GetXid();
 638
 639         if (cifs_sb->tcon->unix_ext)
 640                 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
 641         else
 642                 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
 643                                          NULL);
 644         if (rc && cifs_sb->tcon->ipc) {
 645                 cFYI(1, ("ipc connection - fake read inode"));
 646                 inode->i_mode |= S_IFDIR;
 647                 inode->i_nlink = 2;
 648                 inode->i_op = &cifs_ipc_inode_ops;
 649                 inode->i_fop = &simple_dir_operations;
 650                 inode->i_uid = cifs_sb->mnt_uid;
 651                 inode->i_gid = cifs_sb->mnt_gid;
 652                 _FreeXid(xid);
 653                 iget_failed(inode);
 654                 return ERR_PTR(rc);
 655         }
 656
 657         unlock_new_inode(inode);
 658
 659         /* can not call macro FreeXid here since in a void func
 660          * TODO: This is no longer true
 661          */
 662         _FreeXid(xid);
 663         return inode;
 664 }
 665
 666 int cifs_unlink(struct inode *inode, struct dentry *direntry)
 667 {
 668         int rc = 0;
 669         int xid;
 670         struct cifs_sb_info *cifs_sb;
 671         struct cifsTconInfo *pTcon;
 672         char *full_path = NULL;
 673         struct cifsInodeInfo *cifsInode;
 674         FILE_BASIC_INFO *pinfo_buf;
 675
 676         cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
 677
 678         xid = GetXid();
 679
 680         if (inode)
 681                 cifs_sb = CIFS_SB(inode->i_sb);
 682         else
 683                 cifs_sb = CIFS_SB(direntry->d_sb);
 684         pTcon = cifs_sb->tcon;
 685
 686         /* Unlink can be called from rename so we can not grab the sem here
 687            since we deadlock otherwise */
 688 /*      mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
 689         full_path = build_path_from_dentry(direntry);
 690 /*      mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
 691         if (full_path == NULL) {
 692                 FreeXid(xid);
 693                 return -ENOMEM;
 694         }
 695
 696         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 697                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 698                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 699                 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
 700                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 701                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 702                 cFYI(1, ("posix del rc %d", rc));
 703                 if ((rc == 0) || (rc == -ENOENT))
 704                         goto psx_del_no_retry;
 705         }
 706
 707         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
 708                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 709 psx_del_no_retry:
 710         if (!rc) {
 711                 if (direntry->d_inode)
 712                         drop_nlink(direntry->d_inode);
 713         } else if (rc == -ENOENT) {
 714                 d_drop(direntry);
 715         } else if (rc == -ETXTBSY) {
 716                 int oplock = 0;
 717                 __u16 netfid;
 718
 719                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
 720                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
 721                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
 722                                  cifs_sb->mnt_cifs_flags &
 723                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 724                 if (rc == 0) {
 725                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
 726                                               cifs_sb->local_nls,
 727                                               cifs_sb->mnt_cifs_flags &
 728                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 729                         CIFSSMBClose(xid, pTcon, netfid);
 730                         if (direntry->d_inode)
 731                                 drop_nlink(direntry->d_inode);
 732                 }
 733         } else if (rc == -EACCES) {
 734                 /* try only if r/o attribute set in local lookup data? */
 735                 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
 736                 if (pinfo_buf) {
 737                         /* ATTRS set to normal clears r/o bit */
 738                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
 739                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
 740                                 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
 741                                                      pinfo_buf,
 742                                                      cifs_sb->local_nls,
 743                                                      cifs_sb->mnt_cifs_flags &
 744                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 745                         else
 746                                 rc = -EOPNOTSUPP;
 747
 748                         if (rc == -EOPNOTSUPP) {
 749                                 int oplock = 0;
 750                                 __u16 netfid;
 751                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
 752                                                           full_path,
 753                                                           (__u16)ATTR_NORMAL,
 754                                                           cifs_sb->local_nls);
 755                            For some strange reason it seems that NT4 eats the
 756                            old setattr call without actually setting the
 757                            attributes so on to the third attempted workaround
 758                            */
 759
 760                         /* BB could scan to see if we already have it open
 761                            and pass in pid of opener to function */
 762                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 763                                                  FILE_OPEN, SYNCHRONIZE |
 764                                                  FILE_WRITE_ATTRIBUTES, 0,
 765                                                  &netfid, &oplock, NULL,
 766                                                  cifs_sb->local_nls,
 767                                                  cifs_sb->mnt_cifs_flags &
 768                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 769                                 if (rc == 0) {
 770                                         rc = CIFSSMBSetFileTimes(xid, pTcon,
 771                                                                  pinfo_buf,
 772                                                                  netfid);
 773                                         CIFSSMBClose(xid, pTcon, netfid);
 774                                 }
 775                         }
 776                         kfree(pinfo_buf);
 777                 }
 778                 if (rc == 0) {
 779                         rc = CIFSSMBDelFile(xid, pTcon, full_path,
 780                                             cifs_sb->local_nls,
 781                                             cifs_sb->mnt_cifs_flags &
 782                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 783                         if (!rc) {
 784                                 if (direntry->d_inode)
 785                                         drop_nlink(direntry->d_inode);
 786                         } else if (rc == -ETXTBSY) {
 787                                 int oplock = 0;
 788                                 __u16 netfid;
 789
 790                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 791                                                  FILE_OPEN, DELETE,
 792                                                  CREATE_NOT_DIR |
 793                                                  CREATE_DELETE_ON_CLOSE,
 794                                                  &netfid, &oplock, NULL,
 795                                                  cifs_sb->local_nls,
 796                                                  cifs_sb->mnt_cifs_flags &
 797                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 798                                 if (rc == 0) {
 799                                         CIFSSMBRenameOpenFile(xid, pTcon,
 800                                                 netfid, NULL,
 801                                                 cifs_sb->local_nls,
 802                                                 cifs_sb->mnt_cifs_flags &
 803                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 804                                         CIFSSMBClose(xid, pTcon, netfid);
 805                                         if (direntry->d_inode)
 806                                                 drop_nlink(direntry->d_inode);
 807                                 }
 808                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
 809                         }
 810                 }
 811         }
 812         if (direntry->d_inode) {
 813                 cifsInode = CIFS_I(direntry->d_inode);
 814                 cifsInode->time = 0;    /* will force revalidate to get info
 815                                            when needed */
 816                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
 817         }
 818         if (inode) {
 819                 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
 820                 cifsInode = CIFS_I(inode);
 821                 cifsInode->time = 0;    /* force revalidate of dir as well */
 822         }
 823
 824         kfree(full_path);
 825         FreeXid(xid);
 826         return rc;
 827 }
 828
 829 static void posix_fill_in_inode(struct inode *tmp_inode,
 830         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 831 {
 832         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 833         loff_t local_size;
 834         struct timespec local_mtime;
 835
 836         cifsInfo->time = jiffies;
 837         atomic_inc(&cifsInfo->inUse);
 838
 839         /* save mtime and size */
 840         local_mtime = tmp_inode->i_mtime;
 841         local_size  = tmp_inode->i_size;
 842
 843         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 844         cifs_set_ops(tmp_inode, false);
 845
 846         if (!S_ISREG(tmp_inode->i_mode))
 847                 return;
 848
 849         /*
 850          * No sense invalidating pages for new inode
 851          * since we we have not started caching
 852          * readahead file data yet.
 853          */
 854         if (isNewInode)
 855                 return;
 856
 857         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 858                 (local_size == tmp_inode->i_size)) {
 859                 cFYI(1, ("inode exists but unchanged"));
 860         } else {
 861                 /* file may have changed on server */
 862                 cFYI(1, ("invalidate inode, readdir detected change"));
 863                 invalidate_remote_inode(tmp_inode);
 864         }
 865 }
 866
 867 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 868 {
 869         int rc = 0;
 870         int xid;
 871         struct cifs_sb_info *cifs_sb;
 872         struct cifsTconInfo *pTcon;
 873         char *full_path = NULL;
 874         struct inode *newinode = NULL;
 875
 876         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 877
 878         xid = GetXid();
 879
 880         cifs_sb = CIFS_SB(inode->i_sb);
 881         pTcon = cifs_sb->tcon;
 882
 883         full_path = build_path_from_dentry(direntry);
 884         if (full_path == NULL) {
 885                 FreeXid(xid);
 886                 return -ENOMEM;
 887         }
 888
 889         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 890                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 891                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 892                 u32 oplock = 0;
 893                 FILE_UNIX_BASIC_INFO *pInfo =
 894                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 895                 if (pInfo == NULL) {
 896                         rc = -ENOMEM;
 897                         goto mkdir_out;
 898                 }
 899
 900                 mode &= ~current->fs->umask;
 901                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
 902                                 mode, NULL /* netfid */, pInfo, &oplock,
 903                                 full_path, cifs_sb->local_nls,
 904                                 cifs_sb->mnt_cifs_flags &
 905                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 906                 if (rc == -EOPNOTSUPP) {
 907                         kfree(pInfo);
 908                         goto mkdir_retry_old;
 909                 } else if (rc) {
 910                         cFYI(1, ("posix mkdir returned 0x%x", rc));
 911                         d_drop(direntry);
 912                 } else {
 913                         if (pInfo->Type == cpu_to_le32(-1)) {
 914                                 /* no return info, go query for it */
 915                                 kfree(pInfo);
 916                                 goto mkdir_get_info;
 917                         }
 918 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
 919         to set uid/gid */
 920                         inc_nlink(inode);
 921                         if (pTcon->nocase)
 922                                 direntry->d_op = &cifs_ci_dentry_ops;
 923                         else
 924                                 direntry->d_op = &cifs_dentry_ops;
 925
 926                         newinode = new_inode(inode->i_sb);
 927                         if (newinode == NULL) {
 928                                 kfree(pInfo);
 929                                 goto mkdir_get_info;
 930                         }
 931                         /* Is an i_ino of zero legal? */
 932                         /* Are there sanity checks we can use to ensure that
 933                            the server is really filling in that field? */
 934                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 935                                 newinode->i_ino =
 936                                         (unsigned long)pInfo->UniqueId;
 937                         } /* note ino incremented to unique num in new_inode */
 938                         if (inode->i_sb->s_flags & MS_NOATIME)
 939                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
 940                         newinode->i_nlink = 2;
 941
 942                         insert_inode_hash(newinode);
 943                         d_instantiate(direntry, newinode);
 944
 945                         /* we already checked in POSIXCreate whether
 946                            frame was long enough */
 947                         posix_fill_in_inode(direntry->d_inode,
 948                                         pInfo, 1 /* NewInode */);
 949 #ifdef CONFIG_CIFS_DEBUG2
 950                         cFYI(1, ("instantiated dentry %p %s to inode %p",
 951                                 direntry, direntry->d_name.name, newinode));
 952
 953                         if (newinode->i_nlink != 2)
 954                                 cFYI(1, ("unexpected number of links %d",
 955                                         newinode->i_nlink));
 956 #endif
 957                 }
 958                 kfree(pInfo);
 959                 goto mkdir_out;
 960         }
 961 mkdir_retry_old:
 962         /* BB add setting the equivalent of mode via CreateX w/ACLs */
 963         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
 964                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 965         if (rc) {
 966                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
 967                 d_drop(direntry);
 968         } else {
 969 mkdir_get_info:
 970                 inc_nlink(inode);
 971                 if (pTcon->unix_ext)
 972                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 973                                                       inode->i_sb, xid);
 974                 else
 975                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 976                                                  inode->i_sb, xid, NULL);
 977
 978                 if (pTcon->nocase)
 979                         direntry->d_op = &cifs_ci_dentry_ops;
 980                 else
 981                         direntry->d_op = &cifs_dentry_ops;
 982                 d_instantiate(direntry, newinode);
 983                  /* setting nlink not necessary except in cases where we
 984                   * failed to get it from the server or was set bogus */
 985                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
 986                                 direntry->d_inode->i_nlink = 2;
 987                 mode &= ~current->fs->umask;
 988                 if (pTcon->unix_ext) {
 989                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 990                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 991                                                     mode,
 992                                                     (__u64)current->fsuid,
 993                                                     (__u64)current->fsgid,
 994                                                     0 /* dev_t */,
 995                                                     cifs_sb->local_nls,
 996                                                     cifs_sb->mnt_cifs_flags &
 997                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 998                         } else {
 999                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
1000                                                     mode, (__u64)-1,
1001                                                     (__u64)-1, 0 /* dev_t */,
1002                                                     cifs_sb->local_nls,
1003                                                     cifs_sb->mnt_cifs_flags &
1004                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
1005                         }
1006                 } else {
1007                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1008                             (mode & S_IWUGO) == 0) {
1009                                 FILE_BASIC_INFO pInfo;
1010                                 memset(&pInfo, 0, sizeof(pInfo));
1011                                 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
1012                                 CIFSSMBSetTimes(xid, pTcon, full_path,
1013                                                 &pInfo, cifs_sb->local_nls,
1014                                                 cifs_sb->mnt_cifs_flags &
1015                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1016                         }
1017                         if (direntry->d_inode) {
1018                                 if (cifs_sb->mnt_cifs_flags &
1019                                      CIFS_MOUNT_DYNPERM)
1020                                         direntry->d_inode->i_mode =
1021                                                 (mode | S_IFDIR);
1022
1023                                 if (cifs_sb->mnt_cifs_flags &
1024                                      CIFS_MOUNT_SET_UID) {
1025                                         direntry->d_inode->i_uid =
1026                                                 current->fsuid;
1027                                         direntry->d_inode->i_gid =
1028                                                 current->fsgid;
1029                                 }
1030                         }
1031                 }
1032         }
1033 mkdir_out:
1034         kfree(full_path);
1035         FreeXid(xid);
1036         return rc;
1037 }
1038
1039 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1040 {
1041         int rc = 0;
1042         int xid;
1043         struct cifs_sb_info *cifs_sb;
1044         struct cifsTconInfo *pTcon;
1045         char *full_path = NULL;
1046         struct cifsInodeInfo *cifsInode;
1047
1048         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1049
1050         xid = GetXid();
1051
1052         cifs_sb = CIFS_SB(inode->i_sb);
1053         pTcon = cifs_sb->tcon;
1054
1055         full_path = build_path_from_dentry(direntry);
1056         if (full_path == NULL) {
1057                 FreeXid(xid);
1058                 return -ENOMEM;
1059         }
1060
1061         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1062                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1063
1064         if (!rc) {
1065                 drop_nlink(inode);
1066                 spin_lock(&direntry->d_inode->i_lock);
1067                 i_size_write(direntry->d_inode, 0);
1068                 clear_nlink(direntry->d_inode);
1069                 spin_unlock(&direntry->d_inode->i_lock);
1070         }
1071
1072         cifsInode = CIFS_I(direntry->d_inode);
1073         cifsInode->time = 0;    /* force revalidate to go get info when
1074                                    needed */
1075         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1076                 current_fs_time(inode->i_sb);
1077
1078         kfree(full_path);
1079         FreeXid(xid);
1080         return rc;
1081 }
1082
1083 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1084         struct inode *target_inode, struct dentry *target_direntry)
1085 {
1086         char *fromName;
1087         char *toName;
1088         struct cifs_sb_info *cifs_sb_source;
1089         struct cifs_sb_info *cifs_sb_target;
1090         struct cifsTconInfo *pTcon;
1091         int xid;
1092         int rc = 0;
1093
1094         xid = GetXid();
1095
1096         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1097         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1098         pTcon = cifs_sb_source->tcon;
1099
1100         if (pTcon != cifs_sb_target->tcon) {
1101                 FreeXid(xid);
1102                 return -EXDEV;  /* BB actually could be allowed if same server,
1103                                    but different share.
1104                                    Might eventually add support for this */
1105         }
1106
1107         /* we already  have the rename sem so we do not need to grab it again
1108            here to protect the path integrity */
1109         fromName = build_path_from_dentry(source_direntry);
1110         toName = build_path_from_dentry(target_direntry);
1111         if ((fromName == NULL) || (toName == NULL)) {
1112                 rc = -ENOMEM;
1113                 goto cifs_rename_exit;
1114         }
1115
1116         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1117                            cifs_sb_source->local_nls,
1118                            cifs_sb_source->mnt_cifs_flags &
1119                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1120         if (rc == -EEXIST) {
1121                 /* check if they are the same file because rename of hardlinked
1122                    files is a noop */
1123                 FILE_UNIX_BASIC_INFO *info_buf_source;
1124                 FILE_UNIX_BASIC_INFO *info_buf_target;
1125
1126                 info_buf_source =
1127                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1128                 if (info_buf_source != NULL) {
1129                         info_buf_target = info_buf_source + 1;
1130                         if (pTcon->unix_ext)
1131                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1132                                         info_buf_source,
1133                                         cifs_sb_source->local_nls,
1134                                         cifs_sb_source->mnt_cifs_flags &
1135                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1136                         /* else rc is still EEXIST so will fall through to
1137                            unlink the target and retry rename */
1138                         if (rc == 0) {
1139                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1140                                                 info_buf_target,
1141                                                 cifs_sb_target->local_nls,
1142                                                 /* remap based on source sb */
1143                                                 cifs_sb_source->mnt_cifs_flags &
1144                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
1145                         }
1146                         if ((rc == 0) &&
1147                             (info_buf_source->UniqueId ==
1148                              info_buf_target->UniqueId)) {
1149                         /* do not rename since the files are hardlinked which
1150                            is a noop */
1151                         } else {
1152                         /* we either can not tell the files are hardlinked
1153                            (as with Windows servers) or files are not
1154                            hardlinked so delete the target manually before
1155                            renaming to follow POSIX rather than Windows
1156                            semantics */
1157                                 cifs_unlink(target_inode, target_direntry);
1158                                 rc = CIFSSMBRename(xid, pTcon, fromName,
1159                                                    toName,
1160                                                    cifs_sb_source->local_nls,
1161                                                    cifs_sb_source->mnt_cifs_flags
1162                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
1163                         }
1164                         kfree(info_buf_source);
1165                 } /* if we can not get memory just leave rc as EEXIST */
1166         }
1167
1168         if (rc)
1169                 cFYI(1, ("rename rc %d", rc));
1170
1171         if ((rc == -EIO) || (rc == -EEXIST)) {
1172                 int oplock = 0;
1173                 __u16 netfid;
1174
1175                 /* BB FIXME Is Generic Read correct for rename? */
1176                 /* if renaming directory - we should not say CREATE_NOT_DIR,
1177                    need to test renaming open directory, also GENERIC_READ
1178                    might not right be right access to request */
1179                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1180                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
1181                                  cifs_sb_source->local_nls,
1182                                  cifs_sb_source->mnt_cifs_flags &
1183                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1184                 if (rc == 0) {
1185                         rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1186                                               cifs_sb_source->local_nls,
1187                                               cifs_sb_source->mnt_cifs_flags &
1188                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1189                         CIFSSMBClose(xid, pTcon, netfid);
1190                 }
1191         }
1192
1193 cifs_rename_exit:
1194         kfree(fromName);
1195         kfree(toName);
1196         FreeXid(xid);
1197         return rc;
1198 }
1199
1200 int cifs_revalidate(struct dentry *direntry)
1201 {
1202         int xid;
1203         int rc = 0, wbrc = 0;
1204         char *full_path;
1205         struct cifs_sb_info *cifs_sb;
1206         struct cifsInodeInfo *cifsInode;
1207         loff_t local_size;
1208         struct timespec local_mtime;
1209         bool invalidate_inode = false;
1210
1211         if (direntry->d_inode == NULL)
1212                 return -ENOENT;
1213
1214         cifsInode = CIFS_I(direntry->d_inode);
1215
1216         if (cifsInode == NULL)
1217                 return -ENOENT;
1218
1219         /* no sense revalidating inode info on file that no one can write */
1220         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1221                 return rc;
1222
1223         xid = GetXid();
1224
1225         cifs_sb = CIFS_SB(direntry->d_sb);
1226
1227         /* can not safely grab the rename sem here if rename calls revalidate
1228            since that would deadlock */
1229         full_path = build_path_from_dentry(direntry);
1230         if (full_path == NULL) {
1231                 FreeXid(xid);
1232                 return -ENOMEM;
1233         }
1234         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1235                  "jiffies %ld", full_path, direntry->d_inode,
1236                  direntry->d_inode->i_count.counter, direntry,
1237                  direntry->d_time, jiffies));
1238
1239         if (cifsInode->time == 0) {
1240                 /* was set to zero previously to force revalidate */
1241         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1242                    lookupCacheEnabled) {
1243                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1244                     (direntry->d_inode->i_nlink == 1)) {
1245                         kfree(full_path);
1246                         FreeXid(xid);
1247                         return rc;
1248                 } else {
1249                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1250                 }
1251         }
1252
1253         /* save mtime and size */
1254         local_mtime = direntry->d_inode->i_mtime;
1255         local_size = direntry->d_inode->i_size;
1256
1257         if (cifs_sb->tcon->unix_ext) {
1258                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1259                                               direntry->d_sb, xid);
1260                 if (rc) {
1261                         cFYI(1, ("error on getting revalidate info %d", rc));
1262 /*                      if (rc != -ENOENT)
1263                                 rc = 0; */      /* BB should we cache info on
1264                                                    certain errors? */
1265                 }
1266         } else {
1267                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1268                                          direntry->d_sb, xid, NULL);
1269                 if (rc) {
1270                         cFYI(1, ("error on getting revalidate info %d", rc));
1271 /*                      if (rc != -ENOENT)
1272                                 rc = 0; */      /* BB should we cache info on
1273                                                    certain errors? */
1274                 }
1275         }
1276         /* should we remap certain errors, access denied?, to zero */
1277
1278         /* if not oplocked, we invalidate inode pages if mtime or file size
1279            had changed on server */
1280
1281         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1282             (local_size == direntry->d_inode->i_size)) {
1283                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1284         } else {
1285                 /* file may have changed on server */
1286                 if (cifsInode->clientCanCacheRead) {
1287                         /* no need to invalidate inode pages since we were the
1288                            only ones who could have modified the file and the
1289                            server copy is staler than ours */
1290                 } else {
1291                         invalidate_inode = true;
1292                 }
1293         }
1294
1295         /* can not grab this sem since kernel filesys locking documentation
1296            indicates i_mutex may be taken by the kernel on lookup and rename
1297            which could deadlock if we grab the i_mutex here as well */
1298 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1299         /* need to write out dirty pages here  */
1300         if (direntry->d_inode->i_mapping) {
1301                 /* do we need to lock inode until after invalidate completes
1302                    below? */
1303                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1304                 if (wbrc)
1305                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1306         }
1307         if (invalidate_inode) {
1308         /* shrink_dcache not necessary now that cifs dentry ops
1309         are exported for negative dentries */
1310 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1311                         shrink_dcache_parent(direntry); */
1312                 if (S_ISREG(direntry->d_inode->i_mode)) {
1313                         if (direntry->d_inode->i_mapping)
1314                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1315                                 if (wbrc)
1316                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1317                         /* may eventually have to do this for open files too */
1318                         if (list_empty(&(cifsInode->openFileList))) {
1319                                 /* changed on server - flush read ahead pages */
1320                                 cFYI(1, ("Invalidating read ahead data on "
1321                                          "closed file"));
1322                                 invalidate_remote_inode(direntry->d_inode);
1323                         }
1324                 }
1325         }
1326 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1327
1328         kfree(full_path);
1329         FreeXid(xid);
1330         return rc;
1331 }
1332
1333 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1334         struct kstat *stat)
1335 {
1336         int err = cifs_revalidate(dentry);
1337         if (!err) {
1338                 generic_fillattr(dentry->d_inode, stat);
1339                 stat->blksize = CIFS_MAX_MSGSIZE;
1340         }
1341         return err;
1342 }
1343
1344 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1345 {
1346         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1347         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1348         struct page *page;
1349         int rc = 0;
1350
1351         page = grab_cache_page(mapping, index);
1352         if (!page)
1353                 return -ENOMEM;
1354
1355         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1356         unlock_page(page);
1357         page_cache_release(page);
1358         return rc;
1359 }
1360
1361 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1362 {
1363         struct address_space *mapping = inode->i_mapping;
1364         unsigned long limit;
1365
1366         spin_lock(&inode->i_lock);
1367         if (inode->i_size < offset)
1368                 goto do_expand;
1369         /*
1370          * truncation of in-use swapfiles is disallowed - it would cause
1371          * subsequent swapout to scribble on the now-freed blocks.
1372          */
1373         if (IS_SWAPFILE(inode)) {
1374                 spin_unlock(&inode->i_lock);
1375                 goto out_busy;
1376         }
1377         i_size_write(inode, offset);
1378         spin_unlock(&inode->i_lock);
1379         /*
1380          * unmap_mapping_range is called twice, first simply for efficiency
1381          * so that truncate_inode_pages does fewer single-page unmaps. However
1382          * after this first call, and before truncate_inode_pages finishes,
1383          * it is possible for private pages to be COWed, which remain after
1384          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1385          * call must be made for correctness.
1386          */
1387         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1388         truncate_inode_pages(mapping, offset);
1389         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1390         goto out_truncate;
1391
1392 do_expand:
1393         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1394         if (limit != RLIM_INFINITY && offset > limit) {
1395                 spin_unlock(&inode->i_lock);
1396                 goto out_sig;
1397         }
1398         if (offset > inode->i_sb->s_maxbytes) {
1399                 spin_unlock(&inode->i_lock);
1400                 goto out_big;
1401         }
1402         i_size_write(inode, offset);
1403         spin_unlock(&inode->i_lock);
1404 out_truncate:
1405         if (inode->i_op && inode->i_op->truncate)
1406                 inode->i_op->truncate(inode);
1407         return 0;
1408 out_sig:
1409         send_sig(SIGXFSZ, current, 0);
1410 out_big:
1411         return -EFBIG;
1412 out_busy:
1413         return -ETXTBSY;
1414 }
1415
1416 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1417 {
1418         int xid;
1419         struct cifs_sb_info *cifs_sb;
1420         struct cifsTconInfo *pTcon;
1421         char *full_path = NULL;
1422         int rc = -EACCES;
1423         struct cifsFileInfo *open_file = NULL;
1424         FILE_BASIC_INFO time_buf;
1425         bool set_time = false;
1426         bool set_dosattr = false;
1427         __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1428         __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1429         __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1430         struct cifsInodeInfo *cifsInode;
1431         struct inode *inode = direntry->d_inode;
1432
1433         xid = GetXid();
1434
1435         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1436                  direntry->d_name.name, attrs->ia_valid));
1437
1438         cifs_sb = CIFS_SB(inode->i_sb);
1439         pTcon = cifs_sb->tcon;
1440
1441         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1442                 /* check if we have permission to change attrs */
1443                 rc = inode_change_ok(inode, attrs);
1444                 if (rc < 0) {
1445                         FreeXid(xid);
1446                         return rc;
1447                 } else
1448                         rc = 0;
1449         }
1450
1451         full_path = build_path_from_dentry(direntry);
1452         if (full_path == NULL) {
1453                 FreeXid(xid);
1454                 return -ENOMEM;
1455         }
1456         cifsInode = CIFS_I(inode);
1457
1458         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1459                 /*
1460                    Flush data before changing file size or changing the last
1461                    write time of the file on the server. If the
1462                    flush returns error, store it to report later and continue.
1463                    BB: This should be smarter. Why bother flushing pages that
1464                    will be truncated anyway? Also, should we error out here if
1465                    the flush returns error?
1466                  */
1467                 rc = filemap_write_and_wait(inode->i_mapping);
1468                 if (rc != 0) {
1469                         cifsInode->write_behind_rc = rc;
1470                         rc = 0;
1471                 }
1472         }
1473
1474         if (attrs->ia_valid & ATTR_SIZE) {
1475                 /* To avoid spurious oplock breaks from server, in the case of
1476                    inodes that we already have open, avoid doing path based
1477                    setting of file size if we can do it by handle.
1478                    This keeps our caching token (oplock) and avoids timeouts
1479                    when the local oplock break takes longer to flush
1480                    writebehind data than the SMB timeout for the SetPathInfo
1481                    request would allow */
1482
1483                 open_file = find_writable_file(cifsInode);
1484                 if (open_file) {
1485                         __u16 nfid = open_file->netfid;
1486                         __u32 npid = open_file->pid;
1487                         rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1488                                                 nfid, npid, false);
1489                         atomic_dec(&open_file->wrtPending);
1490                         cFYI(1, ("SetFSize for attrs rc = %d", rc));
1491                         if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1492                                 unsigned int bytes_written;
1493                                 rc = CIFSSMBWrite(xid, pTcon,
1494                                                   nfid, 0, attrs->ia_size,
1495                                                   &bytes_written, NULL, NULL,
1496                                                   1 /* 45 seconds */);
1497                                 cFYI(1, ("Wrt seteof rc %d", rc));
1498                         }
1499                 } else
1500                         rc = -EINVAL;
1501
1502                 if (rc != 0) {
1503                         /* Set file size by pathname rather than by handle
1504                            either because no valid, writeable file handle for
1505                            it was found or because there was an error setting
1506                            it by handle */
1507                         rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1508                                            attrs->ia_size, false,
1509                                            cifs_sb->local_nls,
1510                                            cifs_sb->mnt_cifs_flags &
1511                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1512                         cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1513                         if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1514                                 __u16 netfid;
1515                                 int oplock = 0;
1516
1517                                 rc = SMBLegacyOpen(xid, pTcon, full_path,
1518                                         FILE_OPEN, GENERIC_WRITE,
1519                                         CREATE_NOT_DIR, &netfid, &oplock,
1520                                         NULL, cifs_sb->local_nls,
1521                                         cifs_sb->mnt_cifs_flags &
1522                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1523                                 if (rc == 0) {
1524                                         unsigned int bytes_written;
1525                                         rc = CIFSSMBWrite(xid, pTcon,
1526                                                         netfid, 0,
1527                                                         attrs->ia_size,
1528                                                         &bytes_written, NULL,
1529                                                         NULL, 1 /* 45 sec */);
1530                                         cFYI(1, ("wrt seteof rc %d", rc));
1531                                         CIFSSMBClose(xid, pTcon, netfid);
1532                                 }
1533
1534                         }
1535                 }
1536
1537                 /* Server is ok setting allocation size implicitly - no need
1538                    to call:
1539                 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, true,
1540                          cifs_sb->local_nls);
1541                    */
1542
1543                 if (rc == 0) {
1544                         rc = cifs_vmtruncate(inode, attrs->ia_size);
1545                         cifs_truncate_page(inode->i_mapping, inode->i_size);
1546                 } else
1547                         goto cifs_setattr_exit;
1548         }
1549
1550         /*
1551          * Without unix extensions we can't send ownership changes to the
1552          * server, so silently ignore them. This is consistent with how
1553          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1554          * CIFSACL support + proper Windows to Unix idmapping, we may be
1555          * able to support this in the future.
1556          */
1557         if (!pTcon->unix_ext &&
1558             !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
1559                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1560         } else {
1561                 if (attrs->ia_valid & ATTR_UID) {
1562                         cFYI(1, ("UID changed to %d", attrs->ia_uid));
1563                         uid = attrs->ia_uid;
1564                 }
1565                 if (attrs->ia_valid & ATTR_GID) {
1566                         cFYI(1, ("GID changed to %d", attrs->ia_gid));
1567                         gid = attrs->ia_gid;
1568                 }
1569         }
1570
1571         time_buf.Attributes = 0;
1572
1573         /* skip mode change if it's just for clearing setuid/setgid */
1574         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1575                 attrs->ia_valid &= ~ATTR_MODE;
1576
1577         if (attrs->ia_valid & ATTR_MODE) {
1578                 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1579                 mode = attrs->ia_mode;
1580         }
1581
1582         if ((pTcon->unix_ext)
1583             && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1584                 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1585                                          0 /* dev_t */, cifs_sb->local_nls,
1586                                          cifs_sb->mnt_cifs_flags &
1587                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1588         else if (attrs->ia_valid & ATTR_MODE) {
1589                 rc = 0;
1590 #ifdef CONFIG_CIFS_EXPERIMENTAL
1591                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1592                         rc = mode_to_acl(inode, full_path, mode);
1593                 else
1594 #endif
1595                 if (((mode & S_IWUGO) == 0) &&
1596                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1597                         set_dosattr = true;
1598                         time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs |
1599                                                           ATTR_READONLY);
1600                         /* fix up mode if we're not using dynperm */
1601                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1602                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1603                 } else if ((mode & S_IWUGO) &&
1604                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
1605                         /* If file is readonly on server, we would
1606                         not be able to write to it - so if any write
1607                         bit is enabled for user or group or other we
1608                         need to at least try to remove r/o dos attr */
1609                         set_dosattr = true;
1610                         time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs &
1611                                             (~ATTR_READONLY));
1612                         /* Windows ignores set to zero */
1613                         if (time_buf.Attributes == 0)
1614                                 time_buf.Attributes |= cpu_to_le32(ATTR_NORMAL);
1615
1616                         /* reset local inode permissions to normal */
1617                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1618                                 attrs->ia_mode &= ~(S_IALLUGO);
1619                                 if (S_ISDIR(inode->i_mode))
1620                                         attrs->ia_mode |=
1621                                                 cifs_sb->mnt_dir_mode;
1622                                 else
1623                                         attrs->ia_mode |=
1624                                                 cifs_sb->mnt_file_mode;
1625                         }
1626                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1627                         /* ignore mode change - ATTR_READONLY hasn't changed */
1628                         attrs->ia_valid &= ~ATTR_MODE;
1629                 }
1630         }
1631
1632         if (attrs->ia_valid & ATTR_ATIME) {
1633                 set_time = true;
1634                 time_buf.LastAccessTime =
1635                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1636         } else
1637                 time_buf.LastAccessTime = 0;
1638
1639         if (attrs->ia_valid & ATTR_MTIME) {
1640                 set_time = true;
1641                 time_buf.LastWriteTime =
1642                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1643         } else
1644                 time_buf.LastWriteTime = 0;
1645         /* Do not set ctime explicitly unless other time
1646            stamps are changed explicitly (i.e. by utime()
1647            since we would then have a mix of client and
1648            server times */
1649
1650         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1651                 set_time = true;
1652                 /* Although Samba throws this field away
1653                 it may be useful to Windows - but we do
1654                 not want to set ctime unless some other
1655                 timestamp is changing */
1656                 cFYI(1, ("CIFS - CTIME changed"));
1657                 time_buf.ChangeTime =
1658                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1659         } else
1660                 time_buf.ChangeTime = 0;
1661
1662         if (set_time || set_dosattr) {
1663                 time_buf.CreationTime = 0;      /* do not change */
1664                 /* In the future we should experiment - try setting timestamps
1665                    via Handle (SetFileInfo) instead of by path */
1666                 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1667                         rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1668                                              cifs_sb->local_nls,
1669                                              cifs_sb->mnt_cifs_flags &
1670                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1671                 else
1672                         rc = -EOPNOTSUPP;
1673
1674                 if (rc == -EOPNOTSUPP) {
1675                         int oplock = 0;
1676                         __u16 netfid;
1677
1678                         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1679                                  "times not supported by this server"));
1680                         /* BB we could scan to see if we already have it open
1681                            and pass in pid of opener to function */
1682                         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1683                                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1684                                          CREATE_NOT_DIR, &netfid, &oplock,
1685                                          NULL, cifs_sb->local_nls,
1686                                          cifs_sb->mnt_cifs_flags &
1687                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1688                         if (rc == 0) {
1689                                 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1690                                                          netfid);
1691                                 CIFSSMBClose(xid, pTcon, netfid);
1692                         } else {
1693                         /* BB For even older servers we could convert time_buf
1694                            into old DOS style which uses two second
1695                            granularity */
1696
1697                         /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1698                                         &time_buf, cifs_sb->local_nls); */
1699                         }
1700                 }
1701                 /* Even if error on time set, no sense failing the call if
1702                 the server would set the time to a reasonable value anyway,
1703                 and this check ensures that we are not being called from
1704                 sys_utimes in which case we ought to fail the call back to
1705                 the user when the server rejects the call */
1706                 if ((rc) && (attrs->ia_valid &
1707                          (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1708                         rc = 0;
1709         }
1710
1711         /* do not need local check to inode_check_ok since the server does
1712            that */
1713         if (!rc)
1714                 rc = inode_setattr(inode, attrs);
1715 cifs_setattr_exit:
1716         kfree(full_path);
1717         FreeXid(xid);
1718         return rc;
1719 }
1720
1721 #if 0
1722 void cifs_delete_inode(struct inode *inode)
1723 {
1724         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1725         /* may have to add back in if and when safe distributed caching of
1726            directories added e.g. via FindNotify */
1727 }
1728 #endif