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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
 422         pTcon = cifs_sb->tcon;
 423         cFYI(1, ("Getting info on %s", full_path));
 424
 425         if ((pfindData == NULL) && (*pinode != NULL)) {
 426                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 427                         cFYI(1, ("No need to revalidate cached inode sizes"));
 428                         return rc;
 429                 }
 430         }
 431
 432         /* if file info not passed in then get it from server */
 433         if (pfindData == NULL) {
 434                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 435                 if (buf == NULL)
 436                         return -ENOMEM;
 437                 pfindData = (FILE_ALL_INFO *)buf;
 438
 439                 /* could do find first instead but this returns more info */
 440                 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
 441                               0 /* not legacy */,
 442                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 443                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 444                 /* BB optimize code so we do not make the above call
 445                 when server claims no NT SMB support and the above call
 446                 failed at least once - set flag in tcon or mount */
 447                 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 448                         rc = SMBQueryInformation(xid, pTcon, full_path,
 449                                         pfindData, cifs_sb->local_nls,
 450                                         cifs_sb->mnt_cifs_flags &
 451                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 452                         adjustTZ = true;
 453                 }
 454         }
 455         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
 456         if (rc == -EREMOTE) {
 457                 is_dfs_referral = true;
 458                 fill_fake_finddata(pfindData, sb);
 459                 rc = 0;
 460         } else if (rc)
 461                 goto cgii_exit;
 462
 463         attr = le32_to_cpu(pfindData->Attributes);
 464
 465         /* get new inode */
 466         if (*pinode == NULL) {
 467                 *pinode = new_inode(sb);
 468                 if (*pinode == NULL) {
 469                         rc = -ENOMEM;
 470                         goto cgii_exit;
 471                 }
 472                 /* Is an i_ino of zero legal? Can we use that to check
 473                    if the server supports returning inode numbers?  Are
 474                    there other sanity checks we can use to ensure that
 475                    the server is really filling in that field? */
 476
 477                 /* We can not use the IndexNumber field by default from
 478                    Windows or Samba (in ALL_INFO buf) but we can request
 479                    it explicitly.  It may not be unique presumably if
 480                    the server has multiple devices mounted under one share */
 481
 482                 /* There may be higher info levels that work but are
 483                    there Windows server or network appliances for which
 484                    IndexNumber field is not guaranteed unique? */
 485
 486                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 487                         int rc1 = 0;
 488                         __u64 inode_num;
 489
 490                         rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 491                                         full_path, &inode_num,
 492                                         cifs_sb->local_nls,
 493                                         cifs_sb->mnt_cifs_flags &
 494                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 495                         if (rc1) {
 496                                 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
 497                                 /* BB EOPNOSUPP disable SERVER_INUM? */
 498                         } else /* do we need cast or hash to ino? */
 499                                 (*pinode)->i_ino = inode_num;
 500                 } /* else ino incremented to unique num in new_inode*/
 501                 if (sb->s_flags & MS_NOATIME)
 502                         (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
 503                 insert_inode_hash(*pinode);
 504         }
 505         inode = *pinode;
 506         cifsInfo = CIFS_I(inode);
 507         cifsInfo->cifsAttrs = attr;
 508         cFYI(1, ("Old time %ld", cifsInfo->time));
 509         cifsInfo->time = jiffies;
 510         cFYI(1, ("New time %ld", cifsInfo->time));
 511
 512         /* blksize needs to be multiple of two. So safer to default to
 513         blksize and blkbits set in superblock so 2**blkbits and blksize
 514         will match rather than setting to:
 515         (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 516
 517         /* Linux can not store file creation time so ignore it */
 518         if (pfindData->LastAccessTime)
 519                 inode->i_atime = cifs_NTtimeToUnix
 520                         (le64_to_cpu(pfindData->LastAccessTime));
 521         else /* do not need to use current_fs_time - time not stored */
 522                 inode->i_atime = CURRENT_TIME;
 523         inode->i_mtime =
 524                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 525         inode->i_ctime =
 526             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 527         cFYI(DBG2, ("Attributes came in as 0x%x", attr));
 528         if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
 529                 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
 530                 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
 531         }
 532
 533         /* set default mode. will override for dirs below */
 534         if (atomic_read(&cifsInfo->inUse) == 0)
 535                 /* new inode, can safely set these fields */
 536                 inode->i_mode = cifs_sb->mnt_file_mode;
 537         else /* since we set the inode type below we need to mask off
 538              to avoid strange results if type changes and both
 539              get orred in */
 540                 inode->i_mode &= ~S_IFMT;
 541 /*      if (attr & ATTR_REPARSE)  */
 542         /* We no longer handle these as symlinks because we could not
 543            follow them due to the absolute path with drive letter */
 544         if (attr & ATTR_DIRECTORY) {
 545         /* override default perms since we do not do byte range locking
 546            on dirs */
 547                 inode->i_mode = cifs_sb->mnt_dir_mode;
 548                 inode->i_mode |= S_IFDIR;
 549         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 550                    (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
 551                    /* No need to le64 convert size of zero */
 552                    (pfindData->EndOfFile == 0)) {
 553                 inode->i_mode = cifs_sb->mnt_file_mode;
 554                 inode->i_mode |= S_IFIFO;
 555 /* BB Finish for SFU style symlinks and devices */
 556         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 557                    (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
 558                 if (decode_sfu_inode(inode, le64_to_cpu(pfindData->EndOfFile),
 559                                      full_path, cifs_sb, xid))
 560                         cFYI(1, ("Unrecognized sfu inode type"));
 561
 562                 cFYI(1, ("sfu mode 0%o", inode->i_mode));
 563         } else {
 564                 inode->i_mode |= S_IFREG;
 565                 /* treat dos attribute of read-only as read-only mode eg 555 */
 566                 if (cifsInfo->cifsAttrs & ATTR_READONLY)
 567                         inode->i_mode &= ~(S_IWUGO);
 568                 else if ((inode->i_mode & S_IWUGO) == 0)
 569                         /* the ATTR_READONLY flag may have been */
 570                         /* changed on server -- set any w bits  */
 571                         /* allowed by mnt_file_mode             */
 572                         inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
 573         /* BB add code to validate if device or weird share or device type? */
 574         }
 575
 576         spin_lock(&inode->i_lock);
 577         if (is_size_safe_to_change(cifsInfo,
 578                                    le64_to_cpu(pfindData->EndOfFile))) {
 579                 /* can not safely shrink the file size here if the
 580                    client is writing to it due to potential races */
 581                 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
 582
 583                 /* 512 bytes (2**9) is the fake blocksize that must be
 584                    used for this calculation */
 585                 inode->i_blocks = (512 - 1 + le64_to_cpu(
 586                                    pfindData->AllocationSize)) >> 9;
 587         }
 588         spin_unlock(&inode->i_lock);
 589
 590         inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 591
 592         /* BB fill in uid and gid here? with help from winbind?
 593            or retrieve from NTFS stream extended attribute */
 594 #ifdef CONFIG_CIFS_EXPERIMENTAL
 595         /* fill in 0777 bits from ACL */
 596         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 597                 cFYI(1, ("Getting mode bits from ACL"));
 598                 acl_to_uid_mode(inode, full_path, pfid);
 599         }
 600 #endif
 601         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 602                 /* fill in remaining high mode bits e.g. SUID, VTX */
 603                 get_sfu_mode(inode, full_path, cifs_sb, xid);
 604         } else if (atomic_read(&cifsInfo->inUse) == 0) {
 605                 inode->i_uid = cifs_sb->mnt_uid;
 606                 inode->i_gid = cifs_sb->mnt_gid;
 607                 /* set so we do not keep refreshing these fields with
 608                    bad data after user has changed them in memory */
 609                 atomic_set(&cifsInfo->inUse, 1);
 610         }
 611
 612         cifs_set_ops(inode, is_dfs_referral);
 613
 614
 615
 616
 617 cgii_exit:
 618         kfree(buf);
 619         return rc;
 620 }
 621
 622 static const struct inode_operations cifs_ipc_inode_ops = {
 623         .lookup = cifs_lookup,
 624 };
 625
 626 /* gets root inode */
 627 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
 628 {
 629         int xid;
 630         struct cifs_sb_info *cifs_sb;
 631         struct inode *inode;
 632         long rc;
 633
 634         inode = iget_locked(sb, ino);
 635         if (!inode)
 636                 return ERR_PTR(-ENOMEM);
 637         if (!(inode->i_state & I_NEW))
 638                 return inode;
 639
 640         cifs_sb = CIFS_SB(inode->i_sb);
 641         xid = GetXid();
 642
 643         if (cifs_sb->tcon->unix_ext)
 644                 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
 645         else
 646                 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
 647                                          NULL);
 648         if (rc && cifs_sb->tcon->ipc) {
 649                 cFYI(1, ("ipc connection - fake read inode"));
 650                 inode->i_mode |= S_IFDIR;
 651                 inode->i_nlink = 2;
 652                 inode->i_op = &cifs_ipc_inode_ops;
 653                 inode->i_fop = &simple_dir_operations;
 654                 inode->i_uid = cifs_sb->mnt_uid;
 655                 inode->i_gid = cifs_sb->mnt_gid;
 656                 _FreeXid(xid);
 657                 iget_failed(inode);
 658                 return ERR_PTR(rc);
 659         }
 660
 661         unlock_new_inode(inode);
 662
 663         /* can not call macro FreeXid here since in a void func
 664          * TODO: This is no longer true
 665          */
 666         _FreeXid(xid);
 667         return inode;
 668 }
 669
 670 int cifs_unlink(struct inode *inode, struct dentry *direntry)
 671 {
 672         int rc = 0;
 673         int xid;
 674         struct cifs_sb_info *cifs_sb;
 675         struct cifsTconInfo *pTcon;
 676         char *full_path = NULL;
 677         struct cifsInodeInfo *cifsInode;
 678         FILE_BASIC_INFO *pinfo_buf;
 679
 680         cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
 681
 682         xid = GetXid();
 683
 684         if (inode)
 685                 cifs_sb = CIFS_SB(inode->i_sb);
 686         else
 687                 cifs_sb = CIFS_SB(direntry->d_sb);
 688         pTcon = cifs_sb->tcon;
 689
 690         /* Unlink can be called from rename so we can not grab the sem here
 691            since we deadlock otherwise */
 692 /*      mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
 693         full_path = build_path_from_dentry(direntry);
 694 /*      mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
 695         if (full_path == NULL) {
 696                 FreeXid(xid);
 697                 return -ENOMEM;
 698         }
 699
 700         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 701                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 702                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 703                 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
 704                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 705                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 706                 cFYI(1, ("posix del rc %d", rc));
 707                 if ((rc == 0) || (rc == -ENOENT))
 708                         goto psx_del_no_retry;
 709         }
 710
 711         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
 712                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 713 psx_del_no_retry:
 714         if (!rc) {
 715                 if (direntry->d_inode)
 716                         drop_nlink(direntry->d_inode);
 717         } else if (rc == -ENOENT) {
 718                 d_drop(direntry);
 719         } else if (rc == -ETXTBSY) {
 720                 int oplock = 0;
 721                 __u16 netfid;
 722
 723                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
 724                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
 725                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
 726                                  cifs_sb->mnt_cifs_flags &
 727                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 728                 if (rc == 0) {
 729                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
 730                                               cifs_sb->local_nls,
 731                                               cifs_sb->mnt_cifs_flags &
 732                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 733                         CIFSSMBClose(xid, pTcon, netfid);
 734                         if (direntry->d_inode)
 735                                 drop_nlink(direntry->d_inode);
 736                 }
 737         } else if (rc == -EACCES) {
 738                 /* try only if r/o attribute set in local lookup data? */
 739                 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
 740                 if (pinfo_buf) {
 741                         /* ATTRS set to normal clears r/o bit */
 742                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
 743                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
 744                                 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
 745                                                      pinfo_buf,
 746                                                      cifs_sb->local_nls,
 747                                                      cifs_sb->mnt_cifs_flags &
 748                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 749                         else
 750                                 rc = -EOPNOTSUPP;
 751
 752                         if (rc == -EOPNOTSUPP) {
 753                                 int oplock = 0;
 754                                 __u16 netfid;
 755                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
 756                                                           full_path,
 757                                                           (__u16)ATTR_NORMAL,
 758                                                           cifs_sb->local_nls);
 759                            For some strange reason it seems that NT4 eats the
 760                            old setattr call without actually setting the
 761                            attributes so on to the third attempted workaround
 762                            */
 763
 764                         /* BB could scan to see if we already have it open
 765                            and pass in pid of opener to function */
 766                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 767                                                  FILE_OPEN, SYNCHRONIZE |
 768                                                  FILE_WRITE_ATTRIBUTES, 0,
 769                                                  &netfid, &oplock, NULL,
 770                                                  cifs_sb->local_nls,
 771                                                  cifs_sb->mnt_cifs_flags &
 772                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 773                                 if (rc == 0) {
 774                                         rc = CIFSSMBSetFileTimes(xid, pTcon,
 775                                                                  pinfo_buf,
 776                                                                  netfid);
 777                                         CIFSSMBClose(xid, pTcon, netfid);
 778                                 }
 779                         }
 780                         kfree(pinfo_buf);
 781                 }
 782                 if (rc == 0) {
 783                         rc = CIFSSMBDelFile(xid, pTcon, full_path,
 784                                             cifs_sb->local_nls,
 785                                             cifs_sb->mnt_cifs_flags &
 786                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 787                         if (!rc) {
 788                                 if (direntry->d_inode)
 789                                         drop_nlink(direntry->d_inode);
 790                         } else if (rc == -ETXTBSY) {
 791                                 int oplock = 0;
 792                                 __u16 netfid;
 793
 794                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 795                                                  FILE_OPEN, DELETE,
 796                                                  CREATE_NOT_DIR |
 797                                                  CREATE_DELETE_ON_CLOSE,
 798                                                  &netfid, &oplock, NULL,
 799                                                  cifs_sb->local_nls,
 800                                                  cifs_sb->mnt_cifs_flags &
 801                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 802                                 if (rc == 0) {
 803                                         CIFSSMBRenameOpenFile(xid, pTcon,
 804                                                 netfid, NULL,
 805                                                 cifs_sb->local_nls,
 806                                                 cifs_sb->mnt_cifs_flags &
 807                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 808                                         CIFSSMBClose(xid, pTcon, netfid);
 809                                         if (direntry->d_inode)
 810                                                 drop_nlink(direntry->d_inode);
 811                                 }
 812                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
 813                         }
 814                 }
 815         }
 816         if (direntry->d_inode) {
 817                 cifsInode = CIFS_I(direntry->d_inode);
 818                 cifsInode->time = 0;    /* will force revalidate to get info
 819                                            when needed */
 820                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
 821         }
 822         if (inode) {
 823                 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
 824                 cifsInode = CIFS_I(inode);
 825                 cifsInode->time = 0;    /* force revalidate of dir as well */
 826         }
 827
 828         kfree(full_path);
 829         FreeXid(xid);
 830         return rc;
 831 }
 832
 833 static void posix_fill_in_inode(struct inode *tmp_inode,
 834         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 835 {
 836         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 837         loff_t local_size;
 838         struct timespec local_mtime;
 839
 840         cifsInfo->time = jiffies;
 841         atomic_inc(&cifsInfo->inUse);
 842
 843         /* save mtime and size */
 844         local_mtime = tmp_inode->i_mtime;
 845         local_size  = tmp_inode->i_size;
 846
 847         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 848         cifs_set_ops(tmp_inode, false);
 849
 850         if (!S_ISREG(tmp_inode->i_mode))
 851                 return;
 852
 853         /*
 854          * No sense invalidating pages for new inode
 855          * since we we have not started caching
 856          * readahead file data yet.
 857          */
 858         if (isNewInode)
 859                 return;
 860
 861         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 862                 (local_size == tmp_inode->i_size)) {
 863                 cFYI(1, ("inode exists but unchanged"));
 864         } else {
 865                 /* file may have changed on server */
 866                 cFYI(1, ("invalidate inode, readdir detected change"));
 867                 invalidate_remote_inode(tmp_inode);
 868         }
 869 }
 870
 871 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 872 {
 873         int rc = 0;
 874         int xid;
 875         struct cifs_sb_info *cifs_sb;
 876         struct cifsTconInfo *pTcon;
 877         char *full_path = NULL;
 878         struct inode *newinode = NULL;
 879
 880         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 881
 882         xid = GetXid();
 883
 884         cifs_sb = CIFS_SB(inode->i_sb);
 885         pTcon = cifs_sb->tcon;
 886
 887         full_path = build_path_from_dentry(direntry);
 888         if (full_path == NULL) {
 889                 FreeXid(xid);
 890                 return -ENOMEM;
 891         }
 892
 893         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 894                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 895                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 896                 u32 oplock = 0;
 897                 FILE_UNIX_BASIC_INFO *pInfo =
 898                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 899                 if (pInfo == NULL) {
 900                         rc = -ENOMEM;
 901                         goto mkdir_out;
 902                 }
 903
 904                 mode &= ~current->fs->umask;
 905                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
 906                                 mode, NULL /* netfid */, pInfo, &oplock,
 907                                 full_path, cifs_sb->local_nls,
 908                                 cifs_sb->mnt_cifs_flags &
 909                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 910                 if (rc == -EOPNOTSUPP) {
 911                         kfree(pInfo);
 912                         goto mkdir_retry_old;
 913                 } else if (rc) {
 914                         cFYI(1, ("posix mkdir returned 0x%x", rc));
 915                         d_drop(direntry);
 916                 } else {
 917                         if (pInfo->Type == cpu_to_le32(-1)) {
 918                                 /* no return info, go query for it */
 919                                 kfree(pInfo);
 920                                 goto mkdir_get_info;
 921                         }
 922 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
 923         to set uid/gid */
 924                         inc_nlink(inode);
 925                         if (pTcon->nocase)
 926                                 direntry->d_op = &cifs_ci_dentry_ops;
 927                         else
 928                                 direntry->d_op = &cifs_dentry_ops;
 929
 930                         newinode = new_inode(inode->i_sb);
 931                         if (newinode == NULL) {
 932                                 kfree(pInfo);
 933                                 goto mkdir_get_info;
 934                         }
 935                         /* Is an i_ino of zero legal? */
 936                         /* Are there sanity checks we can use to ensure that
 937                            the server is really filling in that field? */
 938                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 939                                 newinode->i_ino =
 940                                         (unsigned long)pInfo->UniqueId;
 941                         } /* note ino incremented to unique num in new_inode */
 942                         if (inode->i_sb->s_flags & MS_NOATIME)
 943                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
 944                         newinode->i_nlink = 2;
 945
 946                         insert_inode_hash(newinode);
 947                         d_instantiate(direntry, newinode);
 948
 949                         /* we already checked in POSIXCreate whether
 950                            frame was long enough */
 951                         posix_fill_in_inode(direntry->d_inode,
 952                                         pInfo, 1 /* NewInode */);
 953 #ifdef CONFIG_CIFS_DEBUG2
 954                         cFYI(1, ("instantiated dentry %p %s to inode %p",
 955                                 direntry, direntry->d_name.name, newinode));
 956
 957                         if (newinode->i_nlink != 2)
 958                                 cFYI(1, ("unexpected number of links %d",
 959                                         newinode->i_nlink));
 960 #endif
 961                 }
 962                 kfree(pInfo);
 963                 goto mkdir_out;
 964         }
 965 mkdir_retry_old:
 966         /* BB add setting the equivalent of mode via CreateX w/ACLs */
 967         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
 968                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 969         if (rc) {
 970                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
 971                 d_drop(direntry);
 972         } else {
 973 mkdir_get_info:
 974                 inc_nlink(inode);
 975                 if (pTcon->unix_ext)
 976                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 977                                                       inode->i_sb, xid);
 978                 else
 979                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 980                                                  inode->i_sb, xid, NULL);
 981
 982                 if (pTcon->nocase)
 983                         direntry->d_op = &cifs_ci_dentry_ops;
 984                 else
 985                         direntry->d_op = &cifs_dentry_ops;
 986                 d_instantiate(direntry, newinode);
 987                  /* setting nlink not necessary except in cases where we
 988                   * failed to get it from the server or was set bogus */
 989                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
 990                                 direntry->d_inode->i_nlink = 2;
 991                 mode &= ~current->fs->umask;
 992                 if (pTcon->unix_ext) {
 993                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 994                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 995                                                     mode,
 996                                                     (__u64)current->fsuid,
 997                                                     (__u64)current->fsgid,
 998                                                     0 /* dev_t */,
 999                                                     cifs_sb->local_nls,
1000                                                     cifs_sb->mnt_cifs_flags &
1001                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
1002                         } else {
1003                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
1004                                                     mode, (__u64)-1,
1005                                                     (__u64)-1, 0 /* dev_t */,
1006                                                     cifs_sb->local_nls,
1007                                                     cifs_sb->mnt_cifs_flags &
1008                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
1009                         }
1010                 } else {
1011                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1012                             (mode & S_IWUGO) == 0) {
1013                                 FILE_BASIC_INFO pInfo;
1014                                 memset(&pInfo, 0, sizeof(pInfo));
1015                                 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
1016                                 CIFSSMBSetTimes(xid, pTcon, full_path,
1017                                                 &pInfo, cifs_sb->local_nls,
1018                                                 cifs_sb->mnt_cifs_flags &
1019                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1020                         }
1021                         if (direntry->d_inode) {
1022                                 direntry->d_inode->i_mode = mode;
1023                                 direntry->d_inode->i_mode |= S_IFDIR;
1024                                 if (cifs_sb->mnt_cifs_flags &
1025                                      CIFS_MOUNT_SET_UID) {
1026                                         direntry->d_inode->i_uid =
1027                                                 current->fsuid;
1028                                         direntry->d_inode->i_gid =
1029                                                 current->fsgid;
1030                                 }
1031                         }
1032                 }
1033         }
1034 mkdir_out:
1035         kfree(full_path);
1036         FreeXid(xid);
1037         return rc;
1038 }
1039
1040 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1041 {
1042         int rc = 0;
1043         int xid;
1044         struct cifs_sb_info *cifs_sb;
1045         struct cifsTconInfo *pTcon;
1046         char *full_path = NULL;
1047         struct cifsInodeInfo *cifsInode;
1048
1049         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1050
1051         xid = GetXid();
1052
1053         cifs_sb = CIFS_SB(inode->i_sb);
1054         pTcon = cifs_sb->tcon;
1055
1056         full_path = build_path_from_dentry(direntry);
1057         if (full_path == NULL) {
1058                 FreeXid(xid);
1059                 return -ENOMEM;
1060         }
1061
1062         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1063                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1064
1065         if (!rc) {
1066                 drop_nlink(inode);
1067                 spin_lock(&direntry->d_inode->i_lock);
1068                 i_size_write(direntry->d_inode, 0);
1069                 clear_nlink(direntry->d_inode);
1070                 spin_unlock(&direntry->d_inode->i_lock);
1071         }
1072
1073         cifsInode = CIFS_I(direntry->d_inode);
1074         cifsInode->time = 0;    /* force revalidate to go get info when
1075                                    needed */
1076         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1077                 current_fs_time(inode->i_sb);
1078
1079         kfree(full_path);
1080         FreeXid(xid);
1081         return rc;
1082 }
1083
1084 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1085         struct inode *target_inode, struct dentry *target_direntry)
1086 {
1087         char *fromName;
1088         char *toName;
1089         struct cifs_sb_info *cifs_sb_source;
1090         struct cifs_sb_info *cifs_sb_target;
1091         struct cifsTconInfo *pTcon;
1092         int xid;
1093         int rc = 0;
1094
1095         xid = GetXid();
1096
1097         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1098         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1099         pTcon = cifs_sb_source->tcon;
1100
1101         if (pTcon != cifs_sb_target->tcon) {
1102                 FreeXid(xid);
1103                 return -EXDEV;  /* BB actually could be allowed if same server,
1104                                    but different share.
1105                                    Might eventually add support for this */
1106         }
1107
1108         /* we already  have the rename sem so we do not need to grab it again
1109            here to protect the path integrity */
1110         fromName = build_path_from_dentry(source_direntry);
1111         toName = build_path_from_dentry(target_direntry);
1112         if ((fromName == NULL) || (toName == NULL)) {
1113                 rc = -ENOMEM;
1114                 goto cifs_rename_exit;
1115         }
1116
1117         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1118                            cifs_sb_source->local_nls,
1119                            cifs_sb_source->mnt_cifs_flags &
1120                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1121         if (rc == -EEXIST) {
1122                 /* check if they are the same file because rename of hardlinked
1123                    files is a noop */
1124                 FILE_UNIX_BASIC_INFO *info_buf_source;
1125                 FILE_UNIX_BASIC_INFO *info_buf_target;
1126
1127                 info_buf_source =
1128                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1129                 if (info_buf_source != NULL) {
1130                         info_buf_target = info_buf_source + 1;
1131                         if (pTcon->unix_ext)
1132                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1133                                         info_buf_source,
1134                                         cifs_sb_source->local_nls,
1135                                         cifs_sb_source->mnt_cifs_flags &
1136                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1137                         /* else rc is still EEXIST so will fall through to
1138                            unlink the target and retry rename */
1139                         if (rc == 0) {
1140                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1141                                                 info_buf_target,
1142                                                 cifs_sb_target->local_nls,
1143                                                 /* remap based on source sb */
1144                                                 cifs_sb_source->mnt_cifs_flags &
1145                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
1146                         }
1147                         if ((rc == 0) &&
1148                             (info_buf_source->UniqueId ==
1149                              info_buf_target->UniqueId)) {
1150                         /* do not rename since the files are hardlinked which
1151                            is a noop */
1152                         } else {
1153                         /* we either can not tell the files are hardlinked
1154                            (as with Windows servers) or files are not
1155                            hardlinked so delete the target manually before
1156                            renaming to follow POSIX rather than Windows
1157                            semantics */
1158                                 cifs_unlink(target_inode, target_direntry);
1159                                 rc = CIFSSMBRename(xid, pTcon, fromName,
1160                                                    toName,
1161                                                    cifs_sb_source->local_nls,
1162                                                    cifs_sb_source->mnt_cifs_flags
1163                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
1164                         }
1165                         kfree(info_buf_source);
1166                 } /* if we can not get memory just leave rc as EEXIST */
1167         }
1168
1169         if (rc)
1170                 cFYI(1, ("rename rc %d", rc));
1171
1172         if ((rc == -EIO) || (rc == -EEXIST)) {
1173                 int oplock = 0;
1174                 __u16 netfid;
1175
1176                 /* BB FIXME Is Generic Read correct for rename? */
1177                 /* if renaming directory - we should not say CREATE_NOT_DIR,
1178                    need to test renaming open directory, also GENERIC_READ
1179                    might not right be right access to request */
1180                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1181                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
1182                                  cifs_sb_source->local_nls,
1183                                  cifs_sb_source->mnt_cifs_flags &
1184                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1185                 if (rc == 0) {
1186                         rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1187                                               cifs_sb_source->local_nls,
1188                                               cifs_sb_source->mnt_cifs_flags &
1189                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1190                         CIFSSMBClose(xid, pTcon, netfid);
1191                 }
1192         }
1193
1194 cifs_rename_exit:
1195         kfree(fromName);
1196         kfree(toName);
1197         FreeXid(xid);
1198         return rc;
1199 }
1200
1201 int cifs_revalidate(struct dentry *direntry)
1202 {
1203         int xid;
1204         int rc = 0, wbrc = 0;
1205         char *full_path;
1206         struct cifs_sb_info *cifs_sb;
1207         struct cifsInodeInfo *cifsInode;
1208         loff_t local_size;
1209         struct timespec local_mtime;
1210         bool invalidate_inode = false;
1211
1212         if (direntry->d_inode == NULL)
1213                 return -ENOENT;
1214
1215         cifsInode = CIFS_I(direntry->d_inode);
1216
1217         if (cifsInode == NULL)
1218                 return -ENOENT;
1219
1220         /* no sense revalidating inode info on file that no one can write */
1221         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1222                 return rc;
1223
1224         xid = GetXid();
1225
1226         cifs_sb = CIFS_SB(direntry->d_sb);
1227
1228         /* can not safely grab the rename sem here if rename calls revalidate
1229            since that would deadlock */
1230         full_path = build_path_from_dentry(direntry);
1231         if (full_path == NULL) {
1232                 FreeXid(xid);
1233                 return -ENOMEM;
1234         }
1235         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1236                  "jiffies %ld", full_path, direntry->d_inode,
1237                  direntry->d_inode->i_count.counter, direntry,
1238                  direntry->d_time, jiffies));
1239
1240         if (cifsInode->time == 0) {
1241                 /* was set to zero previously to force revalidate */
1242         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1243                    lookupCacheEnabled) {
1244                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1245                     (direntry->d_inode->i_nlink == 1)) {
1246                         kfree(full_path);
1247                         FreeXid(xid);
1248                         return rc;
1249                 } else {
1250                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1251                 }
1252         }
1253
1254         /* save mtime and size */
1255         local_mtime = direntry->d_inode->i_mtime;
1256         local_size = direntry->d_inode->i_size;
1257
1258         if (cifs_sb->tcon->unix_ext) {
1259                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1260                                               direntry->d_sb, xid);
1261                 if (rc) {
1262                         cFYI(1, ("error on getting revalidate info %d", rc));
1263 /*                      if (rc != -ENOENT)
1264                                 rc = 0; */      /* BB should we cache info on
1265                                                    certain errors? */
1266                 }
1267         } else {
1268                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1269                                          direntry->d_sb, xid, NULL);
1270                 if (rc) {
1271                         cFYI(1, ("error on getting revalidate info %d", rc));
1272 /*                      if (rc != -ENOENT)
1273                                 rc = 0; */      /* BB should we cache info on
1274                                                    certain errors? */
1275                 }
1276         }
1277         /* should we remap certain errors, access denied?, to zero */
1278
1279         /* if not oplocked, we invalidate inode pages if mtime or file size
1280            had changed on server */
1281
1282         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1283             (local_size == direntry->d_inode->i_size)) {
1284                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1285         } else {
1286                 /* file may have changed on server */
1287                 if (cifsInode->clientCanCacheRead) {
1288                         /* no need to invalidate inode pages since we were the
1289                            only ones who could have modified the file and the
1290                            server copy is staler than ours */
1291                 } else {
1292                         invalidate_inode = true;
1293                 }
1294         }
1295
1296         /* can not grab this sem since kernel filesys locking documentation
1297            indicates i_mutex may be taken by the kernel on lookup and rename
1298            which could deadlock if we grab the i_mutex here as well */
1299 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1300         /* need to write out dirty pages here  */
1301         if (direntry->d_inode->i_mapping) {
1302                 /* do we need to lock inode until after invalidate completes
1303                    below? */
1304                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1305                 if (wbrc)
1306                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1307         }
1308         if (invalidate_inode) {
1309         /* shrink_dcache not necessary now that cifs dentry ops
1310         are exported for negative dentries */
1311 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1312                         shrink_dcache_parent(direntry); */
1313                 if (S_ISREG(direntry->d_inode->i_mode)) {
1314                         if (direntry->d_inode->i_mapping)
1315                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1316                                 if (wbrc)
1317                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1318                         /* may eventually have to do this for open files too */
1319                         if (list_empty(&(cifsInode->openFileList))) {
1320                                 /* changed on server - flush read ahead pages */
1321                                 cFYI(1, ("Invalidating read ahead data on "
1322                                          "closed file"));
1323                                 invalidate_remote_inode(direntry->d_inode);
1324                         }
1325                 }
1326         }
1327 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1328
1329         kfree(full_path);
1330         FreeXid(xid);
1331         return rc;
1332 }
1333
1334 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1335         struct kstat *stat)
1336 {
1337         int err = cifs_revalidate(dentry);
1338         if (!err) {
1339                 generic_fillattr(dentry->d_inode, stat);
1340                 stat->blksize = CIFS_MAX_MSGSIZE;
1341         }
1342         return err;
1343 }
1344
1345 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1346 {
1347         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1348         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1349         struct page *page;
1350         int rc = 0;
1351
1352         page = grab_cache_page(mapping, index);
1353         if (!page)
1354                 return -ENOMEM;
1355
1356         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1357         unlock_page(page);
1358         page_cache_release(page);
1359         return rc;
1360 }
1361
1362 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1363 {
1364         struct address_space *mapping = inode->i_mapping;
1365         unsigned long limit;
1366
1367         spin_lock(&inode->i_lock);
1368         if (inode->i_size < offset)
1369                 goto do_expand;
1370         /*
1371          * truncation of in-use swapfiles is disallowed - it would cause
1372          * subsequent swapout to scribble on the now-freed blocks.
1373          */
1374         if (IS_SWAPFILE(inode)) {
1375                 spin_unlock(&inode->i_lock);
1376                 goto out_busy;
1377         }
1378         i_size_write(inode, offset);
1379         spin_unlock(&inode->i_lock);
1380         /*
1381          * unmap_mapping_range is called twice, first simply for efficiency
1382          * so that truncate_inode_pages does fewer single-page unmaps. However
1383          * after this first call, and before truncate_inode_pages finishes,
1384          * it is possible for private pages to be COWed, which remain after
1385          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1386          * call must be made for correctness.
1387          */
1388         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1389         truncate_inode_pages(mapping, offset);
1390         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1391         goto out_truncate;
1392
1393 do_expand:
1394         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1395         if (limit != RLIM_INFINITY && offset > limit) {
1396                 spin_unlock(&inode->i_lock);
1397                 goto out_sig;
1398         }
1399         if (offset > inode->i_sb->s_maxbytes) {
1400                 spin_unlock(&inode->i_lock);
1401                 goto out_big;
1402         }
1403         i_size_write(inode, offset);
1404         spin_unlock(&inode->i_lock);
1405 out_truncate:
1406         if (inode->i_op && inode->i_op->truncate)
1407                 inode->i_op->truncate(inode);
1408         return 0;
1409 out_sig:
1410         send_sig(SIGXFSZ, current, 0);
1411 out_big:
1412         return -EFBIG;
1413 out_busy:
1414         return -ETXTBSY;
1415 }
1416
1417 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1418 {
1419         int xid;
1420         struct cifs_sb_info *cifs_sb;
1421         struct cifsTconInfo *pTcon;
1422         char *full_path = NULL;
1423         int rc = -EACCES;
1424         struct cifsFileInfo *open_file = NULL;
1425         FILE_BASIC_INFO time_buf;
1426         bool set_time = false;
1427         bool set_dosattr = false;
1428         __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1429         __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1430         __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1431         struct cifsInodeInfo *cifsInode;
1432         struct inode *inode = direntry->d_inode;
1433
1434         xid = GetXid();
1435
1436         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1437                  direntry->d_name.name, attrs->ia_valid));
1438
1439         cifs_sb = CIFS_SB(inode->i_sb);
1440         pTcon = cifs_sb->tcon;
1441
1442         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1443                 /* check if we have permission to change attrs */
1444                 rc = inode_change_ok(inode, attrs);
1445                 if (rc < 0) {
1446                         FreeXid(xid);
1447                         return rc;
1448                 } else
1449                         rc = 0;
1450         }
1451
1452         full_path = build_path_from_dentry(direntry);
1453         if (full_path == NULL) {
1454                 FreeXid(xid);
1455                 return -ENOMEM;
1456         }
1457         cifsInode = CIFS_I(inode);
1458
1459         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1460                 /*
1461                    Flush data before changing file size or changing the last
1462                    write time of the file on the server. If the
1463                    flush returns error, store it to report later and continue.
1464                    BB: This should be smarter. Why bother flushing pages that
1465                    will be truncated anyway? Also, should we error out here if
1466                    the flush returns error?
1467                  */
1468                 rc = filemap_write_and_wait(inode->i_mapping);
1469                 if (rc != 0) {
1470                         cifsInode->write_behind_rc = rc;
1471                         rc = 0;
1472                 }
1473         }
1474
1475         if (attrs->ia_valid & ATTR_SIZE) {
1476                 /* To avoid spurious oplock breaks from server, in the case of
1477                    inodes that we already have open, avoid doing path based
1478                    setting of file size if we can do it by handle.
1479                    This keeps our caching token (oplock) and avoids timeouts
1480                    when the local oplock break takes longer to flush
1481                    writebehind data than the SMB timeout for the SetPathInfo
1482                    request would allow */
1483
1484                 open_file = find_writable_file(cifsInode);
1485                 if (open_file) {
1486                         __u16 nfid = open_file->netfid;
1487                         __u32 npid = open_file->pid;
1488                         rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1489                                                 nfid, npid, false);
1490                         atomic_dec(&open_file->wrtPending);
1491                         cFYI(1, ("SetFSize for attrs rc = %d", rc));
1492                         if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1493                                 unsigned int bytes_written;
1494                                 rc = CIFSSMBWrite(xid, pTcon,
1495                                                   nfid, 0, attrs->ia_size,
1496                                                   &bytes_written, NULL, NULL,
1497                                                   1 /* 45 seconds */);
1498                                 cFYI(1, ("Wrt seteof rc %d", rc));
1499                         }
1500                 } else
1501                         rc = -EINVAL;
1502
1503                 if (rc != 0) {
1504                         /* Set file size by pathname rather than by handle
1505                            either because no valid, writeable file handle for
1506                            it was found or because there was an error setting
1507                            it by handle */
1508                         rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1509                                            attrs->ia_size, false,
1510                                            cifs_sb->local_nls,
1511                                            cifs_sb->mnt_cifs_flags &
1512                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1513                         cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1514                         if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1515                                 __u16 netfid;
1516                                 int oplock = 0;
1517
1518                                 rc = SMBLegacyOpen(xid, pTcon, full_path,
1519                                         FILE_OPEN, GENERIC_WRITE,
1520                                         CREATE_NOT_DIR, &netfid, &oplock,
1521                                         NULL, cifs_sb->local_nls,
1522                                         cifs_sb->mnt_cifs_flags &
1523                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1524                                 if (rc == 0) {
1525                                         unsigned int bytes_written;
1526                                         rc = CIFSSMBWrite(xid, pTcon,
1527                                                         netfid, 0,
1528                                                         attrs->ia_size,
1529                                                         &bytes_written, NULL,
1530                                                         NULL, 1 /* 45 sec */);
1531                                         cFYI(1, ("wrt seteof rc %d", rc));
1532                                         CIFSSMBClose(xid, pTcon, netfid);
1533                                 }
1534
1535                         }
1536                 }
1537
1538                 /* Server is ok setting allocation size implicitly - no need
1539                    to call:
1540                 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, true,
1541                          cifs_sb->local_nls);
1542                    */
1543
1544                 if (rc == 0) {
1545                         rc = cifs_vmtruncate(inode, attrs->ia_size);
1546                         cifs_truncate_page(inode->i_mapping, inode->i_size);
1547                 } else
1548                         goto cifs_setattr_exit;
1549         }
1550         if (attrs->ia_valid & ATTR_UID) {
1551                 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1552                 uid = attrs->ia_uid;
1553         }
1554         if (attrs->ia_valid & ATTR_GID) {
1555                 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1556                 gid = attrs->ia_gid;
1557         }
1558
1559         time_buf.Attributes = 0;
1560
1561         /* skip mode change if it's just for clearing setuid/setgid */
1562         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1563                 attrs->ia_valid &= ~ATTR_MODE;
1564
1565         if (attrs->ia_valid & ATTR_MODE) {
1566                 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1567                 mode = attrs->ia_mode;
1568         }
1569
1570         if ((pTcon->unix_ext)
1571             && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1572                 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1573                                          0 /* dev_t */, cifs_sb->local_nls,
1574                                          cifs_sb->mnt_cifs_flags &
1575                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1576         else if (attrs->ia_valid & ATTR_MODE) {
1577                 rc = 0;
1578 #ifdef CONFIG_CIFS_EXPERIMENTAL
1579                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1580                         rc = mode_to_acl(inode, full_path, mode);
1581                 else if ((mode & S_IWUGO) == 0) {
1582 #else
1583                 if ((mode & S_IWUGO) == 0) {
1584 #endif
1585                         /* not writeable */
1586                         if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1587                                 set_dosattr = true;
1588                                 time_buf.Attributes =
1589                                         cpu_to_le32(cifsInode->cifsAttrs |
1590                                                     ATTR_READONLY);
1591                         }
1592                 } else if (cifsInode->cifsAttrs & ATTR_READONLY) {
1593                         /* If file is readonly on server, we would
1594                         not be able to write to it - so if any write
1595                         bit is enabled for user or group or other we
1596                         need to at least try to remove r/o dos attr */
1597                         set_dosattr = true;
1598                         time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs &
1599                                             (~ATTR_READONLY));
1600                         /* Windows ignores set to zero */
1601                         if (time_buf.Attributes == 0)
1602                                 time_buf.Attributes |= cpu_to_le32(ATTR_NORMAL);
1603                 }
1604         }
1605
1606         if (attrs->ia_valid & ATTR_ATIME) {
1607                 set_time = true;
1608                 time_buf.LastAccessTime =
1609                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1610         } else
1611                 time_buf.LastAccessTime = 0;
1612
1613         if (attrs->ia_valid & ATTR_MTIME) {
1614                 set_time = true;
1615                 time_buf.LastWriteTime =
1616                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1617         } else
1618                 time_buf.LastWriteTime = 0;
1619         /* Do not set ctime explicitly unless other time
1620            stamps are changed explicitly (i.e. by utime()
1621            since we would then have a mix of client and
1622            server times */
1623
1624         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1625                 set_time = true;
1626                 /* Although Samba throws this field away
1627                 it may be useful to Windows - but we do
1628                 not want to set ctime unless some other
1629                 timestamp is changing */
1630                 cFYI(1, ("CIFS - CTIME changed"));
1631                 time_buf.ChangeTime =
1632                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1633         } else
1634                 time_buf.ChangeTime = 0;
1635
1636         if (set_time || set_dosattr) {
1637                 time_buf.CreationTime = 0;      /* do not change */
1638                 /* In the future we should experiment - try setting timestamps
1639                    via Handle (SetFileInfo) instead of by path */
1640                 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1641                         rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1642                                              cifs_sb->local_nls,
1643                                              cifs_sb->mnt_cifs_flags &
1644                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1645                 else
1646                         rc = -EOPNOTSUPP;
1647
1648                 if (rc == -EOPNOTSUPP) {
1649                         int oplock = 0;
1650                         __u16 netfid;
1651
1652                         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1653                                  "times not supported by this server"));
1654                         /* BB we could scan to see if we already have it open
1655                            and pass in pid of opener to function */
1656                         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1657                                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1658                                          CREATE_NOT_DIR, &netfid, &oplock,
1659                                          NULL, cifs_sb->local_nls,
1660                                          cifs_sb->mnt_cifs_flags &
1661                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1662                         if (rc == 0) {
1663                                 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1664                                                          netfid);
1665                                 CIFSSMBClose(xid, pTcon, netfid);
1666                         } else {
1667                         /* BB For even older servers we could convert time_buf
1668                            into old DOS style which uses two second
1669                            granularity */
1670
1671                         /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1672                                         &time_buf, cifs_sb->local_nls); */
1673                         }
1674                 }
1675                 /* Even if error on time set, no sense failing the call if
1676                 the server would set the time to a reasonable value anyway,
1677                 and this check ensures that we are not being called from
1678                 sys_utimes in which case we ought to fail the call back to
1679                 the user when the server rejects the call */
1680                 if ((rc) && (attrs->ia_valid &
1681                          (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1682                         rc = 0;
1683         }
1684
1685         /* do not need local check to inode_check_ok since the server does
1686            that */
1687         if (!rc)
1688                 rc = inode_setattr(inode, attrs);
1689 cifs_setattr_exit:
1690         kfree(full_path);
1691         FreeXid(xid);
1692         return rc;
1693 }
1694
1695 #if 0
1696 void cifs_delete_inode(struct inode *inode)
1697 {
1698         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1699         /* may have to add back in if and when safe distributed caching of
1700            directories added e.g. via FindNotify */
1701 }
1702 #endif