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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 == -EREMOTE && !is_dfs_referral) {
 223                 is_dfs_referral = true;
 224                 cFYI(DBG2, ("DFS ref"));
 225                 /* for DFS, server does not give us real inode data */
 226                 fill_fake_finddataunix(&find_data, sb);
 227                 rc = 0;
 228         } else if (rc)
 229                 goto cgiiu_exit;
 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
 550                 inode->i_mode &= ~S_IFMT;
 551         }
 552         /* clear write bits if ATTR_READONLY is set */
 553         if (attr & ATTR_READONLY)
 554                 inode->i_mode &= ~S_IWUGO;
 555
 556         /* set inode type */
 557         if ((attr & ATTR_SYSTEM) &&
 558             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
 559                 /* no need to fix endianness on 0 */
 560                 if (pfindData->EndOfFile == 0)
 561                         inode->i_mode |= S_IFIFO;
 562                 else if (decode_sfu_inode(inode,
 563                                 le64_to_cpu(pfindData->EndOfFile),
 564                                 full_path, cifs_sb, xid))
 565                         cFYI(1, ("unknown SFU file type\n"));
 566         } else {
 567                 if (attr & ATTR_DIRECTORY)
 568                         inode->i_mode |= S_IFDIR;
 569                 else
 570                         inode->i_mode |= S_IFREG;
 571         }
 572
 573         spin_lock(&inode->i_lock);
 574         if (is_size_safe_to_change(cifsInfo,
 575                                    le64_to_cpu(pfindData->EndOfFile))) {
 576                 /* can not safely shrink the file size here if the
 577                    client is writing to it due to potential races */
 578                 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
 579
 580                 /* 512 bytes (2**9) is the fake blocksize that must be
 581                    used for this calculation */
 582                 inode->i_blocks = (512 - 1 + le64_to_cpu(
 583                                    pfindData->AllocationSize)) >> 9;
 584         }
 585         spin_unlock(&inode->i_lock);
 586
 587         inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 588
 589         /* BB fill in uid and gid here? with help from winbind?
 590            or retrieve from NTFS stream extended attribute */
 591 #ifdef CONFIG_CIFS_EXPERIMENTAL
 592         /* fill in 0777 bits from ACL */
 593         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 594                 cFYI(1, ("Getting mode bits from ACL"));
 595                 acl_to_uid_mode(inode, full_path, pfid);
 596         }
 597 #endif
 598         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 599                 /* fill in remaining high mode bits e.g. SUID, VTX */
 600                 get_sfu_mode(inode, full_path, cifs_sb, xid);
 601         } else if (atomic_read(&cifsInfo->inUse) == 0) {
 602                 inode->i_uid = cifs_sb->mnt_uid;
 603                 inode->i_gid = cifs_sb->mnt_gid;
 604                 /* set so we do not keep refreshing these fields with
 605                    bad data after user has changed them in memory */
 606                 atomic_set(&cifsInfo->inUse, 1);
 607         }
 608
 609         cifs_set_ops(inode, is_dfs_referral);
 610
 611
 612
 613
 614 cgii_exit:
 615         kfree(buf);
 616         return rc;
 617 }
 618
 619 static const struct inode_operations cifs_ipc_inode_ops = {
 620         .lookup = cifs_lookup,
 621 };
 622
 623 /* gets root inode */
 624 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
 625 {
 626         int xid;
 627         struct cifs_sb_info *cifs_sb;
 628         struct inode *inode;
 629         long rc;
 630
 631         inode = iget_locked(sb, ino);
 632         if (!inode)
 633                 return ERR_PTR(-ENOMEM);
 634         if (!(inode->i_state & I_NEW))
 635                 return inode;
 636
 637         cifs_sb = CIFS_SB(inode->i_sb);
 638         xid = GetXid();
 639
 640         if (cifs_sb->tcon->unix_ext)
 641                 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
 642         else
 643                 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
 644                                          NULL);
 645         if (rc && cifs_sb->tcon->ipc) {
 646                 cFYI(1, ("ipc connection - fake read inode"));
 647                 inode->i_mode |= S_IFDIR;
 648                 inode->i_nlink = 2;
 649                 inode->i_op = &cifs_ipc_inode_ops;
 650                 inode->i_fop = &simple_dir_operations;
 651                 inode->i_uid = cifs_sb->mnt_uid;
 652                 inode->i_gid = cifs_sb->mnt_gid;
 653         } else if (rc) {
 654                 _FreeXid(xid);
 655                 iget_failed(inode);
 656                 return ERR_PTR(rc);
 657         }
 658
 659         unlock_new_inode(inode);
 660
 661         /* can not call macro FreeXid here since in a void func
 662          * TODO: This is no longer true
 663          */
 664         _FreeXid(xid);
 665         return inode;
 666 }
 667
 668 static int
 669 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
 670                     char *full_path, __u32 dosattr)
 671 {
 672         int rc;
 673         int oplock = 0;
 674         __u16 netfid;
 675         __u32 netpid;
 676         bool set_time = false;
 677         struct cifsFileInfo *open_file;
 678         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 679         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 680         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 681         FILE_BASIC_INFO info_buf;
 682
 683         if (attrs->ia_valid & ATTR_ATIME) {
 684                 set_time = true;
 685                 info_buf.LastAccessTime =
 686                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
 687         } else
 688                 info_buf.LastAccessTime = 0;
 689
 690         if (attrs->ia_valid & ATTR_MTIME) {
 691                 set_time = true;
 692                 info_buf.LastWriteTime =
 693                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
 694         } else
 695                 info_buf.LastWriteTime = 0;
 696
 697         /*
 698          * Samba throws this field away, but windows may actually use it.
 699          * Do not set ctime unless other time stamps are changed explicitly
 700          * (i.e. by utimes()) since we would then have a mix of client and
 701          * server times.
 702          */
 703         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
 704                 cFYI(1, ("CIFS - CTIME changed"));
 705                 info_buf.ChangeTime =
 706                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
 707         } else
 708                 info_buf.ChangeTime = 0;
 709
 710         info_buf.CreationTime = 0;      /* don't change */
 711         info_buf.Attributes = cpu_to_le32(dosattr);
 712
 713         /*
 714          * If the file is already open for write, just use that fileid
 715          */
 716         open_file = find_writable_file(cifsInode);
 717         if (open_file) {
 718                 netfid = open_file->netfid;
 719                 netpid = open_file->pid;
 720                 goto set_via_filehandle;
 721         }
 722
 723         /*
 724          * NT4 apparently returns success on this call, but it doesn't
 725          * really work.
 726          */
 727         if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
 728                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
 729                                      &info_buf, cifs_sb->local_nls,
 730                                      cifs_sb->mnt_cifs_flags &
 731                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 732                 if (rc != -EOPNOTSUPP && rc != -EINVAL)
 733                         goto out;
 734         }
 735
 736         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
 737                  "times not supported by this server"));
 738         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
 739                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
 740                          CREATE_NOT_DIR, &netfid, &oplock,
 741                          NULL, cifs_sb->local_nls,
 742                          cifs_sb->mnt_cifs_flags &
 743                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 744
 745         if (rc != 0) {
 746                 if (rc == -EIO)
 747                         rc = -EINVAL;
 748                 goto out;
 749         }
 750
 751         netpid = current->tgid;
 752
 753 set_via_filehandle:
 754         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
 755         if (open_file == NULL)
 756                 CIFSSMBClose(xid, pTcon, netfid);
 757         else
 758                 atomic_dec(&open_file->wrtPending);
 759 out:
 760         return rc;
 761 }
 762
 763 /*
 764  * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 765  * and rename it to a random name that hopefully won't conflict with
 766  * anything else.
 767  */
 768 static int
 769 cifs_rename_pending_delete(char *full_path, struct inode *inode, int xid)
 770 {
 771         int oplock = 0;
 772         int rc;
 773         __u16 netfid;
 774         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 775         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 776         struct cifsTconInfo *tcon = cifs_sb->tcon;
 777         __u32 dosattr;
 778         FILE_BASIC_INFO *info_buf;
 779
 780         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 781                          DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
 782                          &netfid, &oplock, NULL, cifs_sb->local_nls,
 783                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 784         if (rc != 0)
 785                 goto out;
 786
 787         /* set ATTR_HIDDEN and clear ATTR_READONLY */
 788         cifsInode = CIFS_I(inode);
 789         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
 790         if (dosattr == 0)
 791                 dosattr |= ATTR_NORMAL;
 792         dosattr |= ATTR_HIDDEN;
 793
 794         info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
 795         if (info_buf == NULL) {
 796                 rc = -ENOMEM;
 797                 goto out_close;
 798         }
 799         info_buf->Attributes = cpu_to_le32(dosattr);
 800         rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid, current->tgid);
 801         kfree(info_buf);
 802         if (rc != 0)
 803                 goto out_close;
 804
 805         /* silly-rename the file */
 806         rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
 807                                    cifs_sb->mnt_cifs_flags &
 808                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 809
 810         /* set DELETE_ON_CLOSE */
 811         rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid, current->tgid);
 812
 813 out_close:
 814         CIFSSMBClose(xid, tcon, netfid);
 815 out:
 816         return rc;
 817 }
 818
 819 int cifs_unlink(struct inode *dir, struct dentry *dentry)
 820 {
 821         int rc = 0;
 822         int xid;
 823         char *full_path = NULL;
 824         struct inode *inode = dentry->d_inode;
 825         struct cifsInodeInfo *cifsInode;
 826         struct super_block *sb = dir->i_sb;
 827         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 828         struct cifsTconInfo *tcon = cifs_sb->tcon;
 829         struct iattr *attrs;
 830         __u32 dosattr;
 831
 832         cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
 833
 834         xid = GetXid();
 835
 836         /* Unlink can be called from rename so we can not take the
 837          * sb->s_vfs_rename_mutex here */
 838         full_path = build_path_from_dentry(dentry);
 839         if (full_path == NULL) {
 840                 FreeXid(xid);
 841                 return -ENOMEM;
 842         }
 843
 844         if ((tcon->ses->capabilities & CAP_UNIX) &&
 845                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 846                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 847                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
 848                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 849                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 850                 cFYI(1, ("posix del rc %d", rc));
 851                 if ((rc == 0) || (rc == -ENOENT))
 852                         goto psx_del_no_retry;
 853         }
 854
 855         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 856                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 857 psx_del_no_retry:
 858         if (!rc) {
 859                 if (inode)
 860                         drop_nlink(inode);
 861         } else if (rc == -ENOENT) {
 862                 d_drop(dentry);
 863         } else if (rc == -ETXTBSY) {
 864                 rc = cifs_rename_pending_delete(full_path, inode, xid);
 865                 if (rc == 0)
 866                         drop_nlink(inode);
 867         } else if (rc == -EACCES) {
 868                 /* try only if r/o attribute set in local lookup data? */
 869                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
 870                 if (attrs == NULL) {
 871                         rc = -ENOMEM;
 872                         goto out_reval;
 873                 }
 874
 875                 /* try to reset dos attributes */
 876                 cifsInode = CIFS_I(inode);
 877                 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
 878                 if (dosattr == 0)
 879                         dosattr |= ATTR_NORMAL;
 880                 dosattr |= ATTR_HIDDEN;
 881
 882                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
 883                 kfree(attrs);
 884                 if (rc != 0)
 885                         goto out_reval;
 886                 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 887                                     cifs_sb->mnt_cifs_flags &
 888                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 889                 if (rc == 0) {
 890                         if (inode)
 891                                 drop_nlink(inode);
 892                 } else if (rc == -ETXTBSY) {
 893                         rc = cifs_rename_pending_delete(full_path, inode, xid);
 894                         if (rc == 0)
 895                                 drop_nlink(inode);
 896                 }
 897         }
 898 out_reval:
 899         if (inode) {
 900                 cifsInode = CIFS_I(inode);
 901                 cifsInode->time = 0;    /* will force revalidate to get info
 902                                            when needed */
 903                 inode->i_ctime = current_fs_time(sb);
 904         }
 905         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
 906         cifsInode = CIFS_I(dir);
 907         cifsInode->time = 0;    /* force revalidate of dir as well */
 908
 909         kfree(full_path);
 910         FreeXid(xid);
 911         return rc;
 912 }
 913
 914 static void posix_fill_in_inode(struct inode *tmp_inode,
 915         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 916 {
 917         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 918         loff_t local_size;
 919         struct timespec local_mtime;
 920
 921         cifsInfo->time = jiffies;
 922         atomic_inc(&cifsInfo->inUse);
 923
 924         /* save mtime and size */
 925         local_mtime = tmp_inode->i_mtime;
 926         local_size  = tmp_inode->i_size;
 927
 928         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 929         cifs_set_ops(tmp_inode, false);
 930
 931         if (!S_ISREG(tmp_inode->i_mode))
 932                 return;
 933
 934         /*
 935          * No sense invalidating pages for new inode
 936          * since we we have not started caching
 937          * readahead file data yet.
 938          */
 939         if (isNewInode)
 940                 return;
 941
 942         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 943                 (local_size == tmp_inode->i_size)) {
 944                 cFYI(1, ("inode exists but unchanged"));
 945         } else {
 946                 /* file may have changed on server */
 947                 cFYI(1, ("invalidate inode, readdir detected change"));
 948                 invalidate_remote_inode(tmp_inode);
 949         }
 950 }
 951
 952 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 953 {
 954         int rc = 0;
 955         int xid;
 956         struct cifs_sb_info *cifs_sb;
 957         struct cifsTconInfo *pTcon;
 958         char *full_path = NULL;
 959         struct inode *newinode = NULL;
 960
 961         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 962
 963         xid = GetXid();
 964
 965         cifs_sb = CIFS_SB(inode->i_sb);
 966         pTcon = cifs_sb->tcon;
 967
 968         full_path = build_path_from_dentry(direntry);
 969         if (full_path == NULL) {
 970                 FreeXid(xid);
 971                 return -ENOMEM;
 972         }
 973
 974         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 975                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 976                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 977                 u32 oplock = 0;
 978                 FILE_UNIX_BASIC_INFO *pInfo =
 979                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 980                 if (pInfo == NULL) {
 981                         rc = -ENOMEM;
 982                         goto mkdir_out;
 983                 }
 984
 985                 mode &= ~current->fs->umask;
 986                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
 987                                 mode, NULL /* netfid */, pInfo, &oplock,
 988                                 full_path, cifs_sb->local_nls,
 989                                 cifs_sb->mnt_cifs_flags &
 990                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 991                 if (rc == -EOPNOTSUPP) {
 992                         kfree(pInfo);
 993                         goto mkdir_retry_old;
 994                 } else if (rc) {
 995                         cFYI(1, ("posix mkdir returned 0x%x", rc));
 996                         d_drop(direntry);
 997                 } else {
 998                         if (pInfo->Type == cpu_to_le32(-1)) {
 999                                 /* no return info, go query for it */
1000                                 kfree(pInfo);
1001                                 goto mkdir_get_info;
1002                         }
1003 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1004         to set uid/gid */
1005                         inc_nlink(inode);
1006                         if (pTcon->nocase)
1007                                 direntry->d_op = &cifs_ci_dentry_ops;
1008                         else
1009                                 direntry->d_op = &cifs_dentry_ops;
1010
1011                         newinode = new_inode(inode->i_sb);
1012                         if (newinode == NULL) {
1013                                 kfree(pInfo);
1014                                 goto mkdir_get_info;
1015                         }
1016                         /* Is an i_ino of zero legal? */
1017                         /* Are there sanity checks we can use to ensure that
1018                            the server is really filling in that field? */
1019                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1020                                 newinode->i_ino =
1021                                         (unsigned long)pInfo->UniqueId;
1022                         } /* note ino incremented to unique num in new_inode */
1023                         if (inode->i_sb->s_flags & MS_NOATIME)
1024                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
1025                         newinode->i_nlink = 2;
1026
1027                         insert_inode_hash(newinode);
1028                         d_instantiate(direntry, newinode);
1029
1030                         /* we already checked in POSIXCreate whether
1031                            frame was long enough */
1032                         posix_fill_in_inode(direntry->d_inode,
1033                                         pInfo, 1 /* NewInode */);
1034 #ifdef CONFIG_CIFS_DEBUG2
1035                         cFYI(1, ("instantiated dentry %p %s to inode %p",
1036                                 direntry, direntry->d_name.name, newinode));
1037
1038                         if (newinode->i_nlink != 2)
1039                                 cFYI(1, ("unexpected number of links %d",
1040                                         newinode->i_nlink));
1041 #endif
1042                 }
1043                 kfree(pInfo);
1044                 goto mkdir_out;
1045         }
1046 mkdir_retry_old:
1047         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1048         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1049                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1050         if (rc) {
1051                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1052                 d_drop(direntry);
1053         } else {
1054 mkdir_get_info:
1055                 inc_nlink(inode);
1056                 if (pTcon->unix_ext)
1057                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1058                                                       inode->i_sb, xid);
1059                 else
1060                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1061                                                  inode->i_sb, xid, NULL);
1062
1063                 if (pTcon->nocase)
1064                         direntry->d_op = &cifs_ci_dentry_ops;
1065                 else
1066                         direntry->d_op = &cifs_dentry_ops;
1067                 d_instantiate(direntry, newinode);
1068                  /* setting nlink not necessary except in cases where we
1069                   * failed to get it from the server or was set bogus */
1070                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1071                                 direntry->d_inode->i_nlink = 2;
1072
1073                 mode &= ~current->fs->umask;
1074                 /* must turn on setgid bit if parent dir has it */
1075                 if (inode->i_mode & S_ISGID)
1076                         mode |= S_ISGID;
1077
1078                 if (pTcon->unix_ext) {
1079                         struct cifs_unix_set_info_args args = {
1080                                 .mode   = mode,
1081                                 .ctime  = NO_CHANGE_64,
1082                                 .atime  = NO_CHANGE_64,
1083                                 .mtime  = NO_CHANGE_64,
1084                                 .device = 0,
1085                         };
1086                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1087                                 args.uid = (__u64)current->fsuid;
1088                                 if (inode->i_mode & S_ISGID)
1089                                         args.gid = (__u64)inode->i_gid;
1090                                 else
1091                                         args.gid = (__u64)current->fsgid;
1092                         } else {
1093                                 args.uid = NO_CHANGE_64;
1094                                 args.gid = NO_CHANGE_64;
1095                         }
1096                         CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1097                                             cifs_sb->local_nls,
1098                                             cifs_sb->mnt_cifs_flags &
1099                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1100                 } else {
1101                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1102                             (mode & S_IWUGO) == 0) {
1103                                 FILE_BASIC_INFO pInfo;
1104                                 memset(&pInfo, 0, sizeof(pInfo));
1105                                 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
1106                                 CIFSSMBSetPathInfo(xid, pTcon, full_path,
1107                                                 &pInfo, cifs_sb->local_nls,
1108                                                 cifs_sb->mnt_cifs_flags &
1109                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1110                         }
1111                         if (direntry->d_inode) {
1112                                 if (cifs_sb->mnt_cifs_flags &
1113                                      CIFS_MOUNT_DYNPERM)
1114                                         direntry->d_inode->i_mode =
1115                                                 (mode | S_IFDIR);
1116
1117                                 if (cifs_sb->mnt_cifs_flags &
1118                                      CIFS_MOUNT_SET_UID) {
1119                                         direntry->d_inode->i_uid =
1120                                                 current->fsuid;
1121                                         if (inode->i_mode & S_ISGID)
1122                                                 direntry->d_inode->i_gid =
1123                                                         inode->i_gid;
1124                                         else
1125                                                 direntry->d_inode->i_gid =
1126                                                         current->fsgid;
1127                                 }
1128                         }
1129                 }
1130         }
1131 mkdir_out:
1132         kfree(full_path);
1133         FreeXid(xid);
1134         return rc;
1135 }
1136
1137 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1138 {
1139         int rc = 0;
1140         int xid;
1141         struct cifs_sb_info *cifs_sb;
1142         struct cifsTconInfo *pTcon;
1143         char *full_path = NULL;
1144         struct cifsInodeInfo *cifsInode;
1145
1146         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1147
1148         xid = GetXid();
1149
1150         cifs_sb = CIFS_SB(inode->i_sb);
1151         pTcon = cifs_sb->tcon;
1152
1153         full_path = build_path_from_dentry(direntry);
1154         if (full_path == NULL) {
1155                 FreeXid(xid);
1156                 return -ENOMEM;
1157         }
1158
1159         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1160                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1161
1162         if (!rc) {
1163                 drop_nlink(inode);
1164                 spin_lock(&direntry->d_inode->i_lock);
1165                 i_size_write(direntry->d_inode, 0);
1166                 clear_nlink(direntry->d_inode);
1167                 spin_unlock(&direntry->d_inode->i_lock);
1168         }
1169
1170         cifsInode = CIFS_I(direntry->d_inode);
1171         cifsInode->time = 0;    /* force revalidate to go get info when
1172                                    needed */
1173         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1174                 current_fs_time(inode->i_sb);
1175
1176         kfree(full_path);
1177         FreeXid(xid);
1178         return rc;
1179 }
1180
1181 static int
1182 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1183                 struct dentry *to_dentry, const char *toPath)
1184 {
1185         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1186         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1187         __u16 srcfid;
1188         int oplock, rc;
1189
1190         /* try path-based rename first */
1191         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1192                            cifs_sb->mnt_cifs_flags &
1193                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1194
1195         /*
1196          * don't bother with rename by filehandle unless file is busy and
1197          * source Note that cross directory moves do not work with
1198          * rename by filehandle to various Windows servers.
1199          */
1200         if (rc == 0 || rc != -ETXTBSY)
1201                 return rc;
1202
1203         /* open the file to be renamed -- we need DELETE perms */
1204         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1205                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1206                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1207                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1208
1209         if (rc == 0) {
1210                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1211                                 (const char *) to_dentry->d_name.name,
1212                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1213                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1214
1215                 CIFSSMBClose(xid, pTcon, srcfid);
1216         }
1217
1218         return rc;
1219 }
1220
1221 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1222         struct inode *target_inode, struct dentry *target_direntry)
1223 {
1224         char *fromName = NULL;
1225         char *toName = NULL;
1226         struct cifs_sb_info *cifs_sb_source;
1227         struct cifs_sb_info *cifs_sb_target;
1228         struct cifsTconInfo *pTcon;
1229         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1230         FILE_UNIX_BASIC_INFO *info_buf_target;
1231         int xid;
1232         int rc;
1233
1234         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1235         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1236         pTcon = cifs_sb_source->tcon;
1237
1238         xid = GetXid();
1239
1240         /*
1241          * BB: this might be allowed if same server, but different share.
1242          * Consider adding support for this
1243          */
1244         if (pTcon != cifs_sb_target->tcon) {
1245                 rc = -EXDEV;
1246                 goto cifs_rename_exit;
1247         }
1248
1249         /*
1250          * we already have the rename sem so we do not need to
1251          * grab it again here to protect the path integrity
1252          */
1253         fromName = build_path_from_dentry(source_direntry);
1254         if (fromName == NULL) {
1255                 rc = -ENOMEM;
1256                 goto cifs_rename_exit;
1257         }
1258
1259         toName = build_path_from_dentry(target_direntry);
1260         if (toName == NULL) {
1261                 rc = -ENOMEM;
1262                 goto cifs_rename_exit;
1263         }
1264
1265         rc = cifs_do_rename(xid, source_direntry, fromName,
1266                             target_direntry, toName);
1267
1268         if (rc == -EEXIST) {
1269                 if (pTcon->unix_ext) {
1270                         /*
1271                          * Are src and dst hardlinks of same inode? We can
1272                          * only tell with unix extensions enabled
1273                          */
1274                         info_buf_source =
1275                                 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1276                                                 GFP_KERNEL);
1277                         if (info_buf_source != NULL)
1278                                 goto unlink_target;
1279
1280                         info_buf_target = info_buf_source + 1;
1281                         rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1282                                                 info_buf_source,
1283                                                 cifs_sb_source->local_nls,
1284                                                 cifs_sb_source->mnt_cifs_flags &
1285                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1286                         if (rc != 0)
1287                                 goto unlink_target;
1288
1289                         rc = CIFSSMBUnixQPathInfo(xid, pTcon,
1290                                                 toName, info_buf_target,
1291                                                 cifs_sb_target->local_nls,
1292                                                 /* remap based on source sb */
1293                                                 cifs_sb_source->mnt_cifs_flags &
1294                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1295
1296                         if (rc == 0 && (info_buf_source->UniqueId ==
1297                                         info_buf_target->UniqueId))
1298                                 /* same file, POSIX says that this is a noop */
1299                                 goto cifs_rename_exit;
1300                 } /* else ... BB we could add the same check for Windows by
1301                      checking the UniqueId via FILE_INTERNAL_INFO */
1302 unlink_target:
1303                 /*
1304                  * we either can not tell the files are hardlinked (as with
1305                  * Windows servers) or files are not hardlinked. Delete the
1306                  * target manually before renaming to follow POSIX rather than
1307                  * Windows semantics
1308                  */
1309                 cifs_unlink(target_inode, target_direntry);
1310                 rc = cifs_do_rename(xid, source_direntry, fromName,
1311                                     target_direntry, toName);
1312         }
1313
1314 cifs_rename_exit:
1315         kfree(info_buf_source);
1316         kfree(fromName);
1317         kfree(toName);
1318         FreeXid(xid);
1319         return rc;
1320 }
1321
1322 int cifs_revalidate(struct dentry *direntry)
1323 {
1324         int xid;
1325         int rc = 0, wbrc = 0;
1326         char *full_path;
1327         struct cifs_sb_info *cifs_sb;
1328         struct cifsInodeInfo *cifsInode;
1329         loff_t local_size;
1330         struct timespec local_mtime;
1331         bool invalidate_inode = false;
1332
1333         if (direntry->d_inode == NULL)
1334                 return -ENOENT;
1335
1336         cifsInode = CIFS_I(direntry->d_inode);
1337
1338         if (cifsInode == NULL)
1339                 return -ENOENT;
1340
1341         /* no sense revalidating inode info on file that no one can write */
1342         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1343                 return rc;
1344
1345         xid = GetXid();
1346
1347         cifs_sb = CIFS_SB(direntry->d_sb);
1348
1349         /* can not safely grab the rename sem here if rename calls revalidate
1350            since that would deadlock */
1351         full_path = build_path_from_dentry(direntry);
1352         if (full_path == NULL) {
1353                 FreeXid(xid);
1354                 return -ENOMEM;
1355         }
1356         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1357                  "jiffies %ld", full_path, direntry->d_inode,
1358                  direntry->d_inode->i_count.counter, direntry,
1359                  direntry->d_time, jiffies));
1360
1361         if (cifsInode->time == 0) {
1362                 /* was set to zero previously to force revalidate */
1363         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1364                    lookupCacheEnabled) {
1365                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1366                     (direntry->d_inode->i_nlink == 1)) {
1367                         kfree(full_path);
1368                         FreeXid(xid);
1369                         return rc;
1370                 } else {
1371                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1372                 }
1373         }
1374
1375         /* save mtime and size */
1376         local_mtime = direntry->d_inode->i_mtime;
1377         local_size = direntry->d_inode->i_size;
1378
1379         if (cifs_sb->tcon->unix_ext) {
1380                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1381                                               direntry->d_sb, xid);
1382                 if (rc) {
1383                         cFYI(1, ("error on getting revalidate info %d", rc));
1384 /*                      if (rc != -ENOENT)
1385                                 rc = 0; */      /* BB should we cache info on
1386                                                    certain errors? */
1387                 }
1388         } else {
1389                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1390                                          direntry->d_sb, xid, NULL);
1391                 if (rc) {
1392                         cFYI(1, ("error on getting revalidate info %d", rc));
1393 /*                      if (rc != -ENOENT)
1394                                 rc = 0; */      /* BB should we cache info on
1395                                                    certain errors? */
1396                 }
1397         }
1398         /* should we remap certain errors, access denied?, to zero */
1399
1400         /* if not oplocked, we invalidate inode pages if mtime or file size
1401            had changed on server */
1402
1403         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1404             (local_size == direntry->d_inode->i_size)) {
1405                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1406         } else {
1407                 /* file may have changed on server */
1408                 if (cifsInode->clientCanCacheRead) {
1409                         /* no need to invalidate inode pages since we were the
1410                            only ones who could have modified the file and the
1411                            server copy is staler than ours */
1412                 } else {
1413                         invalidate_inode = true;
1414                 }
1415         }
1416
1417         /* can not grab this sem since kernel filesys locking documentation
1418            indicates i_mutex may be taken by the kernel on lookup and rename
1419            which could deadlock if we grab the i_mutex here as well */
1420 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1421         /* need to write out dirty pages here  */
1422         if (direntry->d_inode->i_mapping) {
1423                 /* do we need to lock inode until after invalidate completes
1424                    below? */
1425                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1426                 if (wbrc)
1427                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1428         }
1429         if (invalidate_inode) {
1430         /* shrink_dcache not necessary now that cifs dentry ops
1431         are exported for negative dentries */
1432 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1433                         shrink_dcache_parent(direntry); */
1434                 if (S_ISREG(direntry->d_inode->i_mode)) {
1435                         if (direntry->d_inode->i_mapping) {
1436                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1437                                 if (wbrc)
1438                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1439                         }
1440                         /* may eventually have to do this for open files too */
1441                         if (list_empty(&(cifsInode->openFileList))) {
1442                                 /* changed on server - flush read ahead pages */
1443                                 cFYI(1, ("Invalidating read ahead data on "
1444                                          "closed file"));
1445                                 invalidate_remote_inode(direntry->d_inode);
1446                         }
1447                 }
1448         }
1449 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1450
1451         kfree(full_path);
1452         FreeXid(xid);
1453         return rc;
1454 }
1455
1456 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1457         struct kstat *stat)
1458 {
1459         int err = cifs_revalidate(dentry);
1460         if (!err) {
1461                 generic_fillattr(dentry->d_inode, stat);
1462                 stat->blksize = CIFS_MAX_MSGSIZE;
1463         }
1464         return err;
1465 }
1466
1467 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1468 {
1469         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1470         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1471         struct page *page;
1472         int rc = 0;
1473
1474         page = grab_cache_page(mapping, index);
1475         if (!page)
1476                 return -ENOMEM;
1477
1478         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1479         unlock_page(page);
1480         page_cache_release(page);
1481         return rc;
1482 }
1483
1484 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1485 {
1486         struct address_space *mapping = inode->i_mapping;
1487         unsigned long limit;
1488
1489         spin_lock(&inode->i_lock);
1490         if (inode->i_size < offset)
1491                 goto do_expand;
1492         /*
1493          * truncation of in-use swapfiles is disallowed - it would cause
1494          * subsequent swapout to scribble on the now-freed blocks.
1495          */
1496         if (IS_SWAPFILE(inode)) {
1497                 spin_unlock(&inode->i_lock);
1498                 goto out_busy;
1499         }
1500         i_size_write(inode, offset);
1501         spin_unlock(&inode->i_lock);
1502         /*
1503          * unmap_mapping_range is called twice, first simply for efficiency
1504          * so that truncate_inode_pages does fewer single-page unmaps. However
1505          * after this first call, and before truncate_inode_pages finishes,
1506          * it is possible for private pages to be COWed, which remain after
1507          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1508          * call must be made for correctness.
1509          */
1510         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1511         truncate_inode_pages(mapping, offset);
1512         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1513         goto out_truncate;
1514
1515 do_expand:
1516         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1517         if (limit != RLIM_INFINITY && offset > limit) {
1518                 spin_unlock(&inode->i_lock);
1519                 goto out_sig;
1520         }
1521         if (offset > inode->i_sb->s_maxbytes) {
1522                 spin_unlock(&inode->i_lock);
1523                 goto out_big;
1524         }
1525         i_size_write(inode, offset);
1526         spin_unlock(&inode->i_lock);
1527 out_truncate:
1528         if (inode->i_op && inode->i_op->truncate)
1529                 inode->i_op->truncate(inode);
1530         return 0;
1531 out_sig:
1532         send_sig(SIGXFSZ, current, 0);
1533 out_big:
1534         return -EFBIG;
1535 out_busy:
1536         return -ETXTBSY;
1537 }
1538
1539 static int
1540 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1541                    int xid, char *full_path)
1542 {
1543         int rc;
1544         struct cifsFileInfo *open_file;
1545         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1546         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1547         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1548
1549         /*
1550          * To avoid spurious oplock breaks from server, in the case of
1551          * inodes that we already have open, avoid doing path based
1552          * setting of file size if we can do it by handle.
1553          * This keeps our caching token (oplock) and avoids timeouts
1554          * when the local oplock break takes longer to flush
1555          * writebehind data than the SMB timeout for the SetPathInfo
1556          * request would allow
1557          */
1558         open_file = find_writable_file(cifsInode);
1559         if (open_file) {
1560                 __u16 nfid = open_file->netfid;
1561                 __u32 npid = open_file->pid;
1562                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1563                                         npid, false);
1564                 atomic_dec(&open_file->wrtPending);
1565                 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1566                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1567                         unsigned int bytes_written;
1568                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1569                                           &bytes_written, NULL, NULL, 1);
1570                         cFYI(1, ("Wrt seteof rc %d", rc));
1571                 }
1572         } else
1573                 rc = -EINVAL;
1574
1575         if (rc != 0) {
1576                 /* Set file size by pathname rather than by handle
1577                    either because no valid, writeable file handle for
1578                    it was found or because there was an error setting
1579                    it by handle */
1580                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1581                                    false, cifs_sb->local_nls,
1582                                    cifs_sb->mnt_cifs_flags &
1583                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1584                 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1585                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1586                         __u16 netfid;
1587                         int oplock = 0;
1588
1589                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1590                                 FILE_OPEN, GENERIC_WRITE,
1591                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1592                                 cifs_sb->local_nls,
1593                                 cifs_sb->mnt_cifs_flags &
1594                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1595                         if (rc == 0) {
1596                                 unsigned int bytes_written;
1597                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1598                                                   attrs->ia_size,
1599                                                   &bytes_written, NULL,
1600                                                   NULL, 1);
1601                                 cFYI(1, ("wrt seteof rc %d", rc));
1602                                 CIFSSMBClose(xid, pTcon, netfid);
1603                         }
1604                 }
1605         }
1606
1607         if (rc == 0) {
1608                 rc = cifs_vmtruncate(inode, attrs->ia_size);
1609                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1610         }
1611
1612         return rc;
1613 }
1614
1615 static int
1616 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1617 {
1618         int rc;
1619         int xid;
1620         char *full_path = NULL;
1621         struct inode *inode = direntry->d_inode;
1622         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1623         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1624         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1625         struct cifs_unix_set_info_args *args = NULL;
1626
1627         cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1628                  direntry->d_name.name, attrs->ia_valid));
1629
1630         xid = GetXid();
1631
1632         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1633                 /* check if we have permission to change attrs */
1634                 rc = inode_change_ok(inode, attrs);
1635                 if (rc < 0)
1636                         goto out;
1637                 else
1638                         rc = 0;
1639         }
1640
1641         full_path = build_path_from_dentry(direntry);
1642         if (full_path == NULL) {
1643                 rc = -ENOMEM;
1644                 goto out;
1645         }
1646
1647         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1648                 /*
1649                    Flush data before changing file size or changing the last
1650                    write time of the file on the server. If the
1651                    flush returns error, store it to report later and continue.
1652                    BB: This should be smarter. Why bother flushing pages that
1653                    will be truncated anyway? Also, should we error out here if
1654                    the flush returns error?
1655                  */
1656                 rc = filemap_write_and_wait(inode->i_mapping);
1657                 if (rc != 0) {
1658                         cifsInode->write_behind_rc = rc;
1659                         rc = 0;
1660                 }
1661         }
1662
1663         if (attrs->ia_valid & ATTR_SIZE) {
1664                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1665                 if (rc != 0)
1666                         goto out;
1667         }
1668
1669         /* skip mode change if it's just for clearing setuid/setgid */
1670         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1671                 attrs->ia_valid &= ~ATTR_MODE;
1672
1673         args = kmalloc(sizeof(*args), GFP_KERNEL);
1674         if (args == NULL) {
1675                 rc = -ENOMEM;
1676                 goto out;
1677         }
1678
1679         /* set up the struct */
1680         if (attrs->ia_valid & ATTR_MODE)
1681                 args->mode = attrs->ia_mode;
1682         else
1683                 args->mode = NO_CHANGE_64;
1684
1685         if (attrs->ia_valid & ATTR_UID)
1686                 args->uid = attrs->ia_uid;
1687         else
1688                 args->uid = NO_CHANGE_64;
1689
1690         if (attrs->ia_valid & ATTR_GID)
1691                 args->gid = attrs->ia_gid;
1692         else
1693                 args->gid = NO_CHANGE_64;
1694
1695         if (attrs->ia_valid & ATTR_ATIME)
1696                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1697         else
1698                 args->atime = NO_CHANGE_64;
1699
1700         if (attrs->ia_valid & ATTR_MTIME)
1701                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1702         else
1703                 args->mtime = NO_CHANGE_64;
1704
1705         if (attrs->ia_valid & ATTR_CTIME)
1706                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1707         else
1708                 args->ctime = NO_CHANGE_64;
1709
1710         args->device = 0;
1711         rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1712                                 cifs_sb->local_nls,
1713                                 cifs_sb->mnt_cifs_flags &
1714                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1715
1716         if (!rc)
1717                 rc = inode_setattr(inode, attrs);
1718 out:
1719         kfree(args);
1720         kfree(full_path);
1721         FreeXid(xid);
1722         return rc;
1723 }
1724
1725 static int
1726 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1727 {
1728         int xid;
1729         struct inode *inode = direntry->d_inode;
1730         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1731         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1732         char *full_path = NULL;
1733         int rc = -EACCES;
1734         __u32 dosattr = 0;
1735         __u64 mode = NO_CHANGE_64;
1736
1737         xid = GetXid();
1738
1739         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1740                  direntry->d_name.name, attrs->ia_valid));
1741
1742         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1743                 /* check if we have permission to change attrs */
1744                 rc = inode_change_ok(inode, attrs);
1745                 if (rc < 0) {
1746                         FreeXid(xid);
1747                         return rc;
1748                 } else
1749                         rc = 0;
1750         }
1751
1752         full_path = build_path_from_dentry(direntry);
1753         if (full_path == NULL) {
1754                 FreeXid(xid);
1755                 return -ENOMEM;
1756         }
1757
1758         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1759                 /*
1760                    Flush data before changing file size or changing the last
1761                    write time of the file on the server. If the
1762                    flush returns error, store it to report later and continue.
1763                    BB: This should be smarter. Why bother flushing pages that
1764                    will be truncated anyway? Also, should we error out here if
1765                    the flush returns error?
1766                  */
1767                 rc = filemap_write_and_wait(inode->i_mapping);
1768                 if (rc != 0) {
1769                         cifsInode->write_behind_rc = rc;
1770                         rc = 0;
1771                 }
1772         }
1773
1774         if (attrs->ia_valid & ATTR_SIZE) {
1775                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1776                 if (rc != 0)
1777                         goto cifs_setattr_exit;
1778         }
1779
1780         /*
1781          * Without unix extensions we can't send ownership changes to the
1782          * server, so silently ignore them. This is consistent with how
1783          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1784          * CIFSACL support + proper Windows to Unix idmapping, we may be
1785          * able to support this in the future.
1786          */
1787         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1788                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1789
1790         /* skip mode change if it's just for clearing setuid/setgid */
1791         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1792                 attrs->ia_valid &= ~ATTR_MODE;
1793
1794         if (attrs->ia_valid & ATTR_MODE) {
1795                 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1796                 mode = attrs->ia_mode;
1797         }
1798
1799         if (attrs->ia_valid & ATTR_MODE) {
1800                 rc = 0;
1801 #ifdef CONFIG_CIFS_EXPERIMENTAL
1802                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1803                         rc = mode_to_acl(inode, full_path, mode);
1804                 else
1805 #endif
1806                 if (((mode & S_IWUGO) == 0) &&
1807                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1808
1809                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1810
1811                         /* fix up mode if we're not using dynperm */
1812                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1813                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1814                 } else if ((mode & S_IWUGO) &&
1815                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
1816
1817                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1818                         /* Attributes of 0 are ignored */
1819                         if (dosattr == 0)
1820                                 dosattr |= ATTR_NORMAL;
1821
1822                         /* reset local inode permissions to normal */
1823                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1824                                 attrs->ia_mode &= ~(S_IALLUGO);
1825                                 if (S_ISDIR(inode->i_mode))
1826                                         attrs->ia_mode |=
1827                                                 cifs_sb->mnt_dir_mode;
1828                                 else
1829                                         attrs->ia_mode |=
1830                                                 cifs_sb->mnt_file_mode;
1831                         }
1832                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1833                         /* ignore mode change - ATTR_READONLY hasn't changed */
1834                         attrs->ia_valid &= ~ATTR_MODE;
1835                 }
1836         }
1837
1838         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1839             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1840                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1841                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1842
1843                 /* Even if error on time set, no sense failing the call if
1844                 the server would set the time to a reasonable value anyway,
1845                 and this check ensures that we are not being called from
1846                 sys_utimes in which case we ought to fail the call back to
1847                 the user when the server rejects the call */
1848                 if ((rc) && (attrs->ia_valid &
1849                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1850                         rc = 0;
1851         }
1852
1853         /* do not need local check to inode_check_ok since the server does
1854            that */
1855         if (!rc)
1856                 rc = inode_setattr(inode, attrs);
1857 cifs_setattr_exit:
1858         kfree(full_path);
1859         FreeXid(xid);
1860         return rc;
1861 }
1862
1863 int
1864 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1865 {
1866         struct inode *inode = direntry->d_inode;
1867         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1868         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1869
1870         if (pTcon->unix_ext)
1871                 return cifs_setattr_unix(direntry, attrs);
1872
1873         return cifs_setattr_nounix(direntry, attrs);
1874
1875         /* BB: add cifs_setattr_legacy for really old servers */
1876 }
1877
1878 #if 0
1879 void cifs_delete_inode(struct inode *inode)
1880 {
1881         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1882         /* may have to add back in if and when safe distributed caching of
1883            directories added e.g. via FindNotify */
1884 }
1885 #endif