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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 == 0) {
 733                         cifsInode->cifsAttrs = dosattr;
 734                         goto out;
 735                 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
 736                         goto out;
 737         }
 738
 739         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
 740                  "times not supported by this server"));
 741         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
 742                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
 743                          CREATE_NOT_DIR, &netfid, &oplock,
 744                          NULL, cifs_sb->local_nls,
 745                          cifs_sb->mnt_cifs_flags &
 746                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 747
 748         if (rc != 0) {
 749                 if (rc == -EIO)
 750                         rc = -EINVAL;
 751                 goto out;
 752         }
 753
 754         netpid = current->tgid;
 755
 756 set_via_filehandle:
 757         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
 758         if (!rc)
 759                 cifsInode->cifsAttrs = dosattr;
 760
 761         if (open_file == NULL)
 762                 CIFSSMBClose(xid, pTcon, netfid);
 763         else
 764                 atomic_dec(&open_file->wrtPending);
 765 out:
 766         return rc;
 767 }
 768
 769 /*
 770  * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 771  * and rename it to a random name that hopefully won't conflict with
 772  * anything else.
 773  */
 774 static int
 775 cifs_rename_pending_delete(char *full_path, struct inode *inode, int xid)
 776 {
 777         int oplock = 0;
 778         int rc;
 779         __u16 netfid;
 780         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 781         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 782         struct cifsTconInfo *tcon = cifs_sb->tcon;
 783         __u32 dosattr;
 784         FILE_BASIC_INFO *info_buf;
 785
 786         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 787                          DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
 788                          &netfid, &oplock, NULL, cifs_sb->local_nls,
 789                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 790         if (rc != 0)
 791                 goto out;
 792
 793         /* set ATTR_HIDDEN and clear ATTR_READONLY */
 794         cifsInode = CIFS_I(inode);
 795         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
 796         if (dosattr == 0)
 797                 dosattr |= ATTR_NORMAL;
 798         dosattr |= ATTR_HIDDEN;
 799
 800         info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
 801         if (info_buf == NULL) {
 802                 rc = -ENOMEM;
 803                 goto out_close;
 804         }
 805         info_buf->Attributes = cpu_to_le32(dosattr);
 806         rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid, current->tgid);
 807         kfree(info_buf);
 808         if (rc != 0)
 809                 goto out_close;
 810         cifsInode->cifsAttrs = dosattr;
 811
 812         /* rename the file */
 813         rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
 814                                    cifs_sb->mnt_cifs_flags &
 815                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 816         if (rc != 0)
 817                 goto out;
 818
 819         /* set DELETE_ON_CLOSE */
 820         rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid, current->tgid);
 821
 822         /*
 823          * some samba versions return -ENOENT when we try to set the file
 824          * disposition here. Likely a samba bug, but work around it for now.
 825          * This means that some cifsXXX files may hang around after they
 826          * shouldn't.
 827          *
 828          * BB: remove this once fixed samba servers are in the field
 829          */
 830         if (rc == -ENOENT)
 831                 rc = 0;
 832
 833 out_close:
 834         CIFSSMBClose(xid, tcon, netfid);
 835 out:
 836         return rc;
 837 }
 838
 839 int cifs_unlink(struct inode *dir, struct dentry *dentry)
 840 {
 841         int rc = 0;
 842         int xid;
 843         char *full_path = NULL;
 844         struct inode *inode = dentry->d_inode;
 845         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 846         struct super_block *sb = dir->i_sb;
 847         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 848         struct cifsTconInfo *tcon = cifs_sb->tcon;
 849         struct iattr *attrs = NULL;
 850         __u32 dosattr = 0, origattr = 0;
 851
 852         cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
 853
 854         xid = GetXid();
 855
 856         /* Unlink can be called from rename so we can not take the
 857          * sb->s_vfs_rename_mutex here */
 858         full_path = build_path_from_dentry(dentry);
 859         if (full_path == NULL) {
 860                 FreeXid(xid);
 861                 return -ENOMEM;
 862         }
 863
 864         if ((tcon->ses->capabilities & CAP_UNIX) &&
 865                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 866                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 867                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
 868                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 869                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 870                 cFYI(1, ("posix del rc %d", rc));
 871                 if ((rc == 0) || (rc == -ENOENT))
 872                         goto psx_del_no_retry;
 873         }
 874
 875 retry_std_delete:
 876         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 877                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 878
 879 psx_del_no_retry:
 880         if (!rc) {
 881                 if (inode)
 882                         drop_nlink(inode);
 883         } else if (rc == -ENOENT) {
 884                 d_drop(dentry);
 885         } else if (rc == -ETXTBSY) {
 886                 rc = cifs_rename_pending_delete(full_path, inode, xid);
 887                 if (rc == 0)
 888                         drop_nlink(inode);
 889         } else if (rc == -EACCES && dosattr == 0) {
 890                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
 891                 if (attrs == NULL) {
 892                         rc = -ENOMEM;
 893                         goto out_reval;
 894                 }
 895
 896                 /* try to reset dos attributes */
 897                 origattr = cifsInode->cifsAttrs;
 898                 if (origattr == 0)
 899                         origattr |= ATTR_NORMAL;
 900                 dosattr = origattr & ~ATTR_READONLY;
 901                 if (dosattr == 0)
 902                         dosattr |= ATTR_NORMAL;
 903                 dosattr |= ATTR_HIDDEN;
 904
 905                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
 906                 if (rc != 0)
 907                         goto out_reval;
 908
 909                 goto retry_std_delete;
 910         }
 911
 912         /* undo the setattr if we errored out and it's needed */
 913         if (rc != 0 && dosattr != 0)
 914                 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
 915
 916 out_reval:
 917         if (inode) {
 918                 cifsInode = CIFS_I(inode);
 919                 cifsInode->time = 0;    /* will force revalidate to get info
 920                                            when needed */
 921                 inode->i_ctime = current_fs_time(sb);
 922         }
 923         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
 924         cifsInode = CIFS_I(dir);
 925         CIFS_I(dir)->time = 0;  /* force revalidate of dir as well */
 926
 927         kfree(full_path);
 928         kfree(attrs);
 929         FreeXid(xid);
 930         return rc;
 931 }
 932
 933 static void posix_fill_in_inode(struct inode *tmp_inode,
 934         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 935 {
 936         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 937         loff_t local_size;
 938         struct timespec local_mtime;
 939
 940         cifsInfo->time = jiffies;
 941         atomic_inc(&cifsInfo->inUse);
 942
 943         /* save mtime and size */
 944         local_mtime = tmp_inode->i_mtime;
 945         local_size  = tmp_inode->i_size;
 946
 947         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 948         cifs_set_ops(tmp_inode, false);
 949
 950         if (!S_ISREG(tmp_inode->i_mode))
 951                 return;
 952
 953         /*
 954          * No sense invalidating pages for new inode
 955          * since we we have not started caching
 956          * readahead file data yet.
 957          */
 958         if (isNewInode)
 959                 return;
 960
 961         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 962                 (local_size == tmp_inode->i_size)) {
 963                 cFYI(1, ("inode exists but unchanged"));
 964         } else {
 965                 /* file may have changed on server */
 966                 cFYI(1, ("invalidate inode, readdir detected change"));
 967                 invalidate_remote_inode(tmp_inode);
 968         }
 969 }
 970
 971 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 972 {
 973         int rc = 0, tmprc;
 974         int xid;
 975         struct cifs_sb_info *cifs_sb;
 976         struct cifsTconInfo *pTcon;
 977         char *full_path = NULL;
 978         struct inode *newinode = NULL;
 979
 980         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 981
 982         xid = GetXid();
 983
 984         cifs_sb = CIFS_SB(inode->i_sb);
 985         pTcon = cifs_sb->tcon;
 986
 987         full_path = build_path_from_dentry(direntry);
 988         if (full_path == NULL) {
 989                 FreeXid(xid);
 990                 return -ENOMEM;
 991         }
 992
 993         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 994                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 995                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 996                 u32 oplock = 0;
 997                 FILE_UNIX_BASIC_INFO *pInfo =
 998                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 999                 if (pInfo == NULL) {
1000                         rc = -ENOMEM;
1001                         goto mkdir_out;
1002                 }
1003
1004                 mode &= ~current->fs->umask;
1005                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1006                                 mode, NULL /* netfid */, pInfo, &oplock,
1007                                 full_path, cifs_sb->local_nls,
1008                                 cifs_sb->mnt_cifs_flags &
1009                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1010                 if (rc == -EOPNOTSUPP) {
1011                         kfree(pInfo);
1012                         goto mkdir_retry_old;
1013                 } else if (rc) {
1014                         cFYI(1, ("posix mkdir returned 0x%x", rc));
1015                         d_drop(direntry);
1016                 } else {
1017                         if (pInfo->Type == cpu_to_le32(-1)) {
1018                                 /* no return info, go query for it */
1019                                 kfree(pInfo);
1020                                 goto mkdir_get_info;
1021                         }
1022 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1023         to set uid/gid */
1024                         inc_nlink(inode);
1025                         if (pTcon->nocase)
1026                                 direntry->d_op = &cifs_ci_dentry_ops;
1027                         else
1028                                 direntry->d_op = &cifs_dentry_ops;
1029
1030                         newinode = new_inode(inode->i_sb);
1031                         if (newinode == NULL) {
1032                                 kfree(pInfo);
1033                                 goto mkdir_get_info;
1034                         }
1035
1036                         /* Is an i_ino of zero legal? */
1037                         /* Are there sanity checks we can use to ensure that
1038                            the server is really filling in that field? */
1039                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1040                                 newinode->i_ino =
1041                                         (unsigned long)pInfo->UniqueId;
1042                         } /* note ino incremented to unique num in new_inode */
1043                         if (inode->i_sb->s_flags & MS_NOATIME)
1044                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
1045                         newinode->i_nlink = 2;
1046
1047                         insert_inode_hash(newinode);
1048                         d_instantiate(direntry, newinode);
1049
1050                         /* we already checked in POSIXCreate whether
1051                            frame was long enough */
1052                         posix_fill_in_inode(direntry->d_inode,
1053                                         pInfo, 1 /* NewInode */);
1054 #ifdef CONFIG_CIFS_DEBUG2
1055                         cFYI(1, ("instantiated dentry %p %s to inode %p",
1056                                 direntry, direntry->d_name.name, newinode));
1057
1058                         if (newinode->i_nlink != 2)
1059                                 cFYI(1, ("unexpected number of links %d",
1060                                         newinode->i_nlink));
1061 #endif
1062                 }
1063                 kfree(pInfo);
1064                 goto mkdir_out;
1065         }
1066 mkdir_retry_old:
1067         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1068         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1069                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1070         if (rc) {
1071                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1072                 d_drop(direntry);
1073         } else {
1074 mkdir_get_info:
1075                 inc_nlink(inode);
1076                 if (pTcon->unix_ext)
1077                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1078                                                       inode->i_sb, xid);
1079                 else
1080                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1081                                                  inode->i_sb, xid, NULL);
1082
1083                 if (pTcon->nocase)
1084                         direntry->d_op = &cifs_ci_dentry_ops;
1085                 else
1086                         direntry->d_op = &cifs_dentry_ops;
1087                 d_instantiate(direntry, newinode);
1088                  /* setting nlink not necessary except in cases where we
1089                   * failed to get it from the server or was set bogus */
1090                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1091                                 direntry->d_inode->i_nlink = 2;
1092
1093                 mode &= ~current->fs->umask;
1094                 /* must turn on setgid bit if parent dir has it */
1095                 if (inode->i_mode & S_ISGID)
1096                         mode |= S_ISGID;
1097
1098                 if (pTcon->unix_ext) {
1099                         struct cifs_unix_set_info_args args = {
1100                                 .mode   = mode,
1101                                 .ctime  = NO_CHANGE_64,
1102                                 .atime  = NO_CHANGE_64,
1103                                 .mtime  = NO_CHANGE_64,
1104                                 .device = 0,
1105                         };
1106                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1107                                 args.uid = (__u64)current->fsuid;
1108                                 if (inode->i_mode & S_ISGID)
1109                                         args.gid = (__u64)inode->i_gid;
1110                                 else
1111                                         args.gid = (__u64)current->fsgid;
1112                         } else {
1113                                 args.uid = NO_CHANGE_64;
1114                                 args.gid = NO_CHANGE_64;
1115                         }
1116                         CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1117                                             cifs_sb->local_nls,
1118                                             cifs_sb->mnt_cifs_flags &
1119                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1120                 } else {
1121                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1122                             (mode & S_IWUGO) == 0) {
1123                                 FILE_BASIC_INFO pInfo;
1124                                 struct cifsInodeInfo *cifsInode;
1125                                 u32 dosattrs;
1126
1127                                 memset(&pInfo, 0, sizeof(pInfo));
1128                                 cifsInode = CIFS_I(newinode);
1129                                 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1130                                 pInfo.Attributes = cpu_to_le32(dosattrs);
1131                                 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1132                                                 full_path, &pInfo,
1133                                                 cifs_sb->local_nls,
1134                                                 cifs_sb->mnt_cifs_flags &
1135                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1136                                 if (tmprc == 0)
1137                                         cifsInode->cifsAttrs = dosattrs;
1138                         }
1139                         if (direntry->d_inode) {
1140                                 if (cifs_sb->mnt_cifs_flags &
1141                                      CIFS_MOUNT_DYNPERM)
1142                                         direntry->d_inode->i_mode =
1143                                                 (mode | S_IFDIR);
1144
1145                                 if (cifs_sb->mnt_cifs_flags &
1146                                      CIFS_MOUNT_SET_UID) {
1147                                         direntry->d_inode->i_uid =
1148                                                 current->fsuid;
1149                                         if (inode->i_mode & S_ISGID)
1150                                                 direntry->d_inode->i_gid =
1151                                                         inode->i_gid;
1152                                         else
1153                                                 direntry->d_inode->i_gid =
1154                                                         current->fsgid;
1155                                 }
1156                         }
1157                 }
1158         }
1159 mkdir_out:
1160         kfree(full_path);
1161         FreeXid(xid);
1162         return rc;
1163 }
1164
1165 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1166 {
1167         int rc = 0;
1168         int xid;
1169         struct cifs_sb_info *cifs_sb;
1170         struct cifsTconInfo *pTcon;
1171         char *full_path = NULL;
1172         struct cifsInodeInfo *cifsInode;
1173
1174         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1175
1176         xid = GetXid();
1177
1178         cifs_sb = CIFS_SB(inode->i_sb);
1179         pTcon = cifs_sb->tcon;
1180
1181         full_path = build_path_from_dentry(direntry);
1182         if (full_path == NULL) {
1183                 FreeXid(xid);
1184                 return -ENOMEM;
1185         }
1186
1187         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1188                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1189
1190         if (!rc) {
1191                 drop_nlink(inode);
1192                 spin_lock(&direntry->d_inode->i_lock);
1193                 i_size_write(direntry->d_inode, 0);
1194                 clear_nlink(direntry->d_inode);
1195                 spin_unlock(&direntry->d_inode->i_lock);
1196         }
1197
1198         cifsInode = CIFS_I(direntry->d_inode);
1199         cifsInode->time = 0;    /* force revalidate to go get info when
1200                                    needed */
1201         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1202                 current_fs_time(inode->i_sb);
1203
1204         kfree(full_path);
1205         FreeXid(xid);
1206         return rc;
1207 }
1208
1209 static int
1210 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1211                 struct dentry *to_dentry, const char *toPath)
1212 {
1213         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1214         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1215         __u16 srcfid;
1216         int oplock, rc;
1217
1218         /* try path-based rename first */
1219         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1220                            cifs_sb->mnt_cifs_flags &
1221                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1222
1223         /*
1224          * don't bother with rename by filehandle unless file is busy and
1225          * source Note that cross directory moves do not work with
1226          * rename by filehandle to various Windows servers.
1227          */
1228         if (rc == 0 || rc != -ETXTBSY)
1229                 return rc;
1230
1231         /* open the file to be renamed -- we need DELETE perms */
1232         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1233                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1234                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1235                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1236
1237         if (rc == 0) {
1238                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1239                                 (const char *) to_dentry->d_name.name,
1240                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1241                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1242
1243                 CIFSSMBClose(xid, pTcon, srcfid);
1244         }
1245
1246         return rc;
1247 }
1248
1249 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1250         struct inode *target_inode, struct dentry *target_direntry)
1251 {
1252         char *fromName = NULL;
1253         char *toName = NULL;
1254         struct cifs_sb_info *cifs_sb_source;
1255         struct cifs_sb_info *cifs_sb_target;
1256         struct cifsTconInfo *pTcon;
1257         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1258         FILE_UNIX_BASIC_INFO *info_buf_target;
1259         int xid;
1260         int rc;
1261
1262         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1263         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1264         pTcon = cifs_sb_source->tcon;
1265
1266         xid = GetXid();
1267
1268         /*
1269          * BB: this might be allowed if same server, but different share.
1270          * Consider adding support for this
1271          */
1272         if (pTcon != cifs_sb_target->tcon) {
1273                 rc = -EXDEV;
1274                 goto cifs_rename_exit;
1275         }
1276
1277         /*
1278          * we already have the rename sem so we do not need to
1279          * grab it again here to protect the path integrity
1280          */
1281         fromName = build_path_from_dentry(source_direntry);
1282         if (fromName == NULL) {
1283                 rc = -ENOMEM;
1284                 goto cifs_rename_exit;
1285         }
1286
1287         toName = build_path_from_dentry(target_direntry);
1288         if (toName == NULL) {
1289                 rc = -ENOMEM;
1290                 goto cifs_rename_exit;
1291         }
1292
1293         rc = cifs_do_rename(xid, source_direntry, fromName,
1294                             target_direntry, toName);
1295
1296         if (rc == -EEXIST) {
1297                 if (pTcon->unix_ext) {
1298                         /*
1299                          * Are src and dst hardlinks of same inode? We can
1300                          * only tell with unix extensions enabled
1301                          */
1302                         info_buf_source =
1303                                 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1304                                                 GFP_KERNEL);
1305                         if (info_buf_source == NULL)
1306                                 goto unlink_target;
1307
1308                         info_buf_target = info_buf_source + 1;
1309                         rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1310                                                 info_buf_source,
1311                                                 cifs_sb_source->local_nls,
1312                                                 cifs_sb_source->mnt_cifs_flags &
1313                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1314                         if (rc != 0)
1315                                 goto unlink_target;
1316
1317                         rc = CIFSSMBUnixQPathInfo(xid, pTcon,
1318                                                 toName, info_buf_target,
1319                                                 cifs_sb_target->local_nls,
1320                                                 /* remap based on source sb */
1321                                                 cifs_sb_source->mnt_cifs_flags &
1322                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1323
1324                         if (rc == 0 && (info_buf_source->UniqueId ==
1325                                         info_buf_target->UniqueId))
1326                                 /* same file, POSIX says that this is a noop */
1327                                 goto cifs_rename_exit;
1328                 } /* else ... BB we could add the same check for Windows by
1329                      checking the UniqueId via FILE_INTERNAL_INFO */
1330 unlink_target:
1331                 /*
1332                  * we either can not tell the files are hardlinked (as with
1333                  * Windows servers) or files are not hardlinked. Delete the
1334                  * target manually before renaming to follow POSIX rather than
1335                  * Windows semantics
1336                  */
1337                 cifs_unlink(target_inode, target_direntry);
1338                 rc = cifs_do_rename(xid, source_direntry, fromName,
1339                                     target_direntry, toName);
1340         }
1341
1342 cifs_rename_exit:
1343         kfree(info_buf_source);
1344         kfree(fromName);
1345         kfree(toName);
1346         FreeXid(xid);
1347         return rc;
1348 }
1349
1350 int cifs_revalidate(struct dentry *direntry)
1351 {
1352         int xid;
1353         int rc = 0, wbrc = 0;
1354         char *full_path;
1355         struct cifs_sb_info *cifs_sb;
1356         struct cifsInodeInfo *cifsInode;
1357         loff_t local_size;
1358         struct timespec local_mtime;
1359         bool invalidate_inode = false;
1360
1361         if (direntry->d_inode == NULL)
1362                 return -ENOENT;
1363
1364         cifsInode = CIFS_I(direntry->d_inode);
1365
1366         if (cifsInode == NULL)
1367                 return -ENOENT;
1368
1369         /* no sense revalidating inode info on file that no one can write */
1370         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1371                 return rc;
1372
1373         xid = GetXid();
1374
1375         cifs_sb = CIFS_SB(direntry->d_sb);
1376
1377         /* can not safely grab the rename sem here if rename calls revalidate
1378            since that would deadlock */
1379         full_path = build_path_from_dentry(direntry);
1380         if (full_path == NULL) {
1381                 FreeXid(xid);
1382                 return -ENOMEM;
1383         }
1384         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1385                  "jiffies %ld", full_path, direntry->d_inode,
1386                  direntry->d_inode->i_count.counter, direntry,
1387                  direntry->d_time, jiffies));
1388
1389         if (cifsInode->time == 0) {
1390                 /* was set to zero previously to force revalidate */
1391         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1392                    lookupCacheEnabled) {
1393                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1394                     (direntry->d_inode->i_nlink == 1)) {
1395                         kfree(full_path);
1396                         FreeXid(xid);
1397                         return rc;
1398                 } else {
1399                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1400                 }
1401         }
1402
1403         /* save mtime and size */
1404         local_mtime = direntry->d_inode->i_mtime;
1405         local_size = direntry->d_inode->i_size;
1406
1407         if (cifs_sb->tcon->unix_ext) {
1408                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1409                                               direntry->d_sb, xid);
1410                 if (rc) {
1411                         cFYI(1, ("error on getting revalidate info %d", rc));
1412 /*                      if (rc != -ENOENT)
1413                                 rc = 0; */      /* BB should we cache info on
1414                                                    certain errors? */
1415                 }
1416         } else {
1417                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1418                                          direntry->d_sb, xid, NULL);
1419                 if (rc) {
1420                         cFYI(1, ("error on getting revalidate info %d", rc));
1421 /*                      if (rc != -ENOENT)
1422                                 rc = 0; */      /* BB should we cache info on
1423                                                    certain errors? */
1424                 }
1425         }
1426         /* should we remap certain errors, access denied?, to zero */
1427
1428         /* if not oplocked, we invalidate inode pages if mtime or file size
1429            had changed on server */
1430
1431         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1432             (local_size == direntry->d_inode->i_size)) {
1433                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1434         } else {
1435                 /* file may have changed on server */
1436                 if (cifsInode->clientCanCacheRead) {
1437                         /* no need to invalidate inode pages since we were the
1438                            only ones who could have modified the file and the
1439                            server copy is staler than ours */
1440                 } else {
1441                         invalidate_inode = true;
1442                 }
1443         }
1444
1445         /* can not grab this sem since kernel filesys locking documentation
1446            indicates i_mutex may be taken by the kernel on lookup and rename
1447            which could deadlock if we grab the i_mutex here as well */
1448 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1449         /* need to write out dirty pages here  */
1450         if (direntry->d_inode->i_mapping) {
1451                 /* do we need to lock inode until after invalidate completes
1452                    below? */
1453                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1454                 if (wbrc)
1455                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1456         }
1457         if (invalidate_inode) {
1458         /* shrink_dcache not necessary now that cifs dentry ops
1459         are exported for negative dentries */
1460 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1461                         shrink_dcache_parent(direntry); */
1462                 if (S_ISREG(direntry->d_inode->i_mode)) {
1463                         if (direntry->d_inode->i_mapping) {
1464                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1465                                 if (wbrc)
1466                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1467                         }
1468                         /* may eventually have to do this for open files too */
1469                         if (list_empty(&(cifsInode->openFileList))) {
1470                                 /* changed on server - flush read ahead pages */
1471                                 cFYI(1, ("Invalidating read ahead data on "
1472                                          "closed file"));
1473                                 invalidate_remote_inode(direntry->d_inode);
1474                         }
1475                 }
1476         }
1477 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1478
1479         kfree(full_path);
1480         FreeXid(xid);
1481         return rc;
1482 }
1483
1484 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1485         struct kstat *stat)
1486 {
1487         int err = cifs_revalidate(dentry);
1488         if (!err) {
1489                 generic_fillattr(dentry->d_inode, stat);
1490                 stat->blksize = CIFS_MAX_MSGSIZE;
1491         }
1492         return err;
1493 }
1494
1495 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1496 {
1497         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1498         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1499         struct page *page;
1500         int rc = 0;
1501
1502         page = grab_cache_page(mapping, index);
1503         if (!page)
1504                 return -ENOMEM;
1505
1506         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1507         unlock_page(page);
1508         page_cache_release(page);
1509         return rc;
1510 }
1511
1512 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1513 {
1514         struct address_space *mapping = inode->i_mapping;
1515         unsigned long limit;
1516
1517         spin_lock(&inode->i_lock);
1518         if (inode->i_size < offset)
1519                 goto do_expand;
1520         /*
1521          * truncation of in-use swapfiles is disallowed - it would cause
1522          * subsequent swapout to scribble on the now-freed blocks.
1523          */
1524         if (IS_SWAPFILE(inode)) {
1525                 spin_unlock(&inode->i_lock);
1526                 goto out_busy;
1527         }
1528         i_size_write(inode, offset);
1529         spin_unlock(&inode->i_lock);
1530         /*
1531          * unmap_mapping_range is called twice, first simply for efficiency
1532          * so that truncate_inode_pages does fewer single-page unmaps. However
1533          * after this first call, and before truncate_inode_pages finishes,
1534          * it is possible for private pages to be COWed, which remain after
1535          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1536          * call must be made for correctness.
1537          */
1538         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1539         truncate_inode_pages(mapping, offset);
1540         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1541         goto out_truncate;
1542
1543 do_expand:
1544         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1545         if (limit != RLIM_INFINITY && offset > limit) {
1546                 spin_unlock(&inode->i_lock);
1547                 goto out_sig;
1548         }
1549         if (offset > inode->i_sb->s_maxbytes) {
1550                 spin_unlock(&inode->i_lock);
1551                 goto out_big;
1552         }
1553         i_size_write(inode, offset);
1554         spin_unlock(&inode->i_lock);
1555 out_truncate:
1556         if (inode->i_op && inode->i_op->truncate)
1557                 inode->i_op->truncate(inode);
1558         return 0;
1559 out_sig:
1560         send_sig(SIGXFSZ, current, 0);
1561 out_big:
1562         return -EFBIG;
1563 out_busy:
1564         return -ETXTBSY;
1565 }
1566
1567 static int
1568 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1569                    int xid, char *full_path)
1570 {
1571         int rc;
1572         struct cifsFileInfo *open_file;
1573         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1574         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1575         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1576
1577         /*
1578          * To avoid spurious oplock breaks from server, in the case of
1579          * inodes that we already have open, avoid doing path based
1580          * setting of file size if we can do it by handle.
1581          * This keeps our caching token (oplock) and avoids timeouts
1582          * when the local oplock break takes longer to flush
1583          * writebehind data than the SMB timeout for the SetPathInfo
1584          * request would allow
1585          */
1586         open_file = find_writable_file(cifsInode);
1587         if (open_file) {
1588                 __u16 nfid = open_file->netfid;
1589                 __u32 npid = open_file->pid;
1590                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1591                                         npid, false);
1592                 atomic_dec(&open_file->wrtPending);
1593                 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1594                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1595                         unsigned int bytes_written;
1596                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1597                                           &bytes_written, NULL, NULL, 1);
1598                         cFYI(1, ("Wrt seteof rc %d", rc));
1599                 }
1600         } else
1601                 rc = -EINVAL;
1602
1603         if (rc != 0) {
1604                 /* Set file size by pathname rather than by handle
1605                    either because no valid, writeable file handle for
1606                    it was found or because there was an error setting
1607                    it by handle */
1608                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1609                                    false, cifs_sb->local_nls,
1610                                    cifs_sb->mnt_cifs_flags &
1611                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1612                 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1613                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1614                         __u16 netfid;
1615                         int oplock = 0;
1616
1617                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1618                                 FILE_OPEN, GENERIC_WRITE,
1619                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1620                                 cifs_sb->local_nls,
1621                                 cifs_sb->mnt_cifs_flags &
1622                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1623                         if (rc == 0) {
1624                                 unsigned int bytes_written;
1625                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1626                                                   attrs->ia_size,
1627                                                   &bytes_written, NULL,
1628                                                   NULL, 1);
1629                                 cFYI(1, ("wrt seteof rc %d", rc));
1630                                 CIFSSMBClose(xid, pTcon, netfid);
1631                         }
1632                 }
1633         }
1634
1635         if (rc == 0) {
1636                 rc = cifs_vmtruncate(inode, attrs->ia_size);
1637                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1638         }
1639
1640         return rc;
1641 }
1642
1643 static int
1644 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1645 {
1646         int rc;
1647         int xid;
1648         char *full_path = NULL;
1649         struct inode *inode = direntry->d_inode;
1650         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1651         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1652         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1653         struct cifs_unix_set_info_args *args = NULL;
1654
1655         cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1656                  direntry->d_name.name, attrs->ia_valid));
1657
1658         xid = GetXid();
1659
1660         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1661                 /* check if we have permission to change attrs */
1662                 rc = inode_change_ok(inode, attrs);
1663                 if (rc < 0)
1664                         goto out;
1665                 else
1666                         rc = 0;
1667         }
1668
1669         full_path = build_path_from_dentry(direntry);
1670         if (full_path == NULL) {
1671                 rc = -ENOMEM;
1672                 goto out;
1673         }
1674
1675         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1676                 /*
1677                    Flush data before changing file size or changing the last
1678                    write time of the file on the server. If the
1679                    flush returns error, store it to report later and continue.
1680                    BB: This should be smarter. Why bother flushing pages that
1681                    will be truncated anyway? Also, should we error out here if
1682                    the flush returns error?
1683                  */
1684                 rc = filemap_write_and_wait(inode->i_mapping);
1685                 if (rc != 0) {
1686                         cifsInode->write_behind_rc = rc;
1687                         rc = 0;
1688                 }
1689         }
1690
1691         if (attrs->ia_valid & ATTR_SIZE) {
1692                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1693                 if (rc != 0)
1694                         goto out;
1695         }
1696
1697         /* skip mode change if it's just for clearing setuid/setgid */
1698         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1699                 attrs->ia_valid &= ~ATTR_MODE;
1700
1701         args = kmalloc(sizeof(*args), GFP_KERNEL);
1702         if (args == NULL) {
1703                 rc = -ENOMEM;
1704                 goto out;
1705         }
1706
1707         /* set up the struct */
1708         if (attrs->ia_valid & ATTR_MODE)
1709                 args->mode = attrs->ia_mode;
1710         else
1711                 args->mode = NO_CHANGE_64;
1712
1713         if (attrs->ia_valid & ATTR_UID)
1714                 args->uid = attrs->ia_uid;
1715         else
1716                 args->uid = NO_CHANGE_64;
1717
1718         if (attrs->ia_valid & ATTR_GID)
1719                 args->gid = attrs->ia_gid;
1720         else
1721                 args->gid = NO_CHANGE_64;
1722
1723         if (attrs->ia_valid & ATTR_ATIME)
1724                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1725         else
1726                 args->atime = NO_CHANGE_64;
1727
1728         if (attrs->ia_valid & ATTR_MTIME)
1729                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1730         else
1731                 args->mtime = NO_CHANGE_64;
1732
1733         if (attrs->ia_valid & ATTR_CTIME)
1734                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1735         else
1736                 args->ctime = NO_CHANGE_64;
1737
1738         args->device = 0;
1739         rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1740                                 cifs_sb->local_nls,
1741                                 cifs_sb->mnt_cifs_flags &
1742                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1743
1744         if (!rc)
1745                 rc = inode_setattr(inode, attrs);
1746 out:
1747         kfree(args);
1748         kfree(full_path);
1749         FreeXid(xid);
1750         return rc;
1751 }
1752
1753 static int
1754 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1755 {
1756         int xid;
1757         struct inode *inode = direntry->d_inode;
1758         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1759         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1760         char *full_path = NULL;
1761         int rc = -EACCES;
1762         __u32 dosattr = 0;
1763         __u64 mode = NO_CHANGE_64;
1764
1765         xid = GetXid();
1766
1767         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1768                  direntry->d_name.name, attrs->ia_valid));
1769
1770         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1771                 /* check if we have permission to change attrs */
1772                 rc = inode_change_ok(inode, attrs);
1773                 if (rc < 0) {
1774                         FreeXid(xid);
1775                         return rc;
1776                 } else
1777                         rc = 0;
1778         }
1779
1780         full_path = build_path_from_dentry(direntry);
1781         if (full_path == NULL) {
1782                 FreeXid(xid);
1783                 return -ENOMEM;
1784         }
1785
1786         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1787                 /*
1788                    Flush data before changing file size or changing the last
1789                    write time of the file on the server. If the
1790                    flush returns error, store it to report later and continue.
1791                    BB: This should be smarter. Why bother flushing pages that
1792                    will be truncated anyway? Also, should we error out here if
1793                    the flush returns error?
1794                  */
1795                 rc = filemap_write_and_wait(inode->i_mapping);
1796                 if (rc != 0) {
1797                         cifsInode->write_behind_rc = rc;
1798                         rc = 0;
1799                 }
1800         }
1801
1802         if (attrs->ia_valid & ATTR_SIZE) {
1803                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1804                 if (rc != 0)
1805                         goto cifs_setattr_exit;
1806         }
1807
1808         /*
1809          * Without unix extensions we can't send ownership changes to the
1810          * server, so silently ignore them. This is consistent with how
1811          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1812          * CIFSACL support + proper Windows to Unix idmapping, we may be
1813          * able to support this in the future.
1814          */
1815         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1816                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1817
1818         /* skip mode change if it's just for clearing setuid/setgid */
1819         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1820                 attrs->ia_valid &= ~ATTR_MODE;
1821
1822         if (attrs->ia_valid & ATTR_MODE) {
1823                 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1824                 mode = attrs->ia_mode;
1825         }
1826
1827         if (attrs->ia_valid & ATTR_MODE) {
1828                 rc = 0;
1829 #ifdef CONFIG_CIFS_EXPERIMENTAL
1830                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1831                         rc = mode_to_acl(inode, full_path, mode);
1832                 else
1833 #endif
1834                 if (((mode & S_IWUGO) == 0) &&
1835                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1836
1837                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1838
1839                         /* fix up mode if we're not using dynperm */
1840                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1841                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1842                 } else if ((mode & S_IWUGO) &&
1843                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
1844
1845                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1846                         /* Attributes of 0 are ignored */
1847                         if (dosattr == 0)
1848                                 dosattr |= ATTR_NORMAL;
1849
1850                         /* reset local inode permissions to normal */
1851                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1852                                 attrs->ia_mode &= ~(S_IALLUGO);
1853                                 if (S_ISDIR(inode->i_mode))
1854                                         attrs->ia_mode |=
1855                                                 cifs_sb->mnt_dir_mode;
1856                                 else
1857                                         attrs->ia_mode |=
1858                                                 cifs_sb->mnt_file_mode;
1859                         }
1860                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1861                         /* ignore mode change - ATTR_READONLY hasn't changed */
1862                         attrs->ia_valid &= ~ATTR_MODE;
1863                 }
1864         }
1865
1866         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1867             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1868                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1869                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1870
1871                 /* Even if error on time set, no sense failing the call if
1872                 the server would set the time to a reasonable value anyway,
1873                 and this check ensures that we are not being called from
1874                 sys_utimes in which case we ought to fail the call back to
1875                 the user when the server rejects the call */
1876                 if ((rc) && (attrs->ia_valid &
1877                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1878                         rc = 0;
1879         }
1880
1881         /* do not need local check to inode_check_ok since the server does
1882            that */
1883         if (!rc)
1884                 rc = inode_setattr(inode, attrs);
1885 cifs_setattr_exit:
1886         kfree(full_path);
1887         FreeXid(xid);
1888         return rc;
1889 }
1890
1891 int
1892 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1893 {
1894         struct inode *inode = direntry->d_inode;
1895         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1896         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1897
1898         if (pTcon->unix_ext)
1899                 return cifs_setattr_unix(direntry, attrs);
1900
1901         return cifs_setattr_nounix(direntry, attrs);
1902
1903         /* BB: add cifs_setattr_legacy for really old servers */
1904 }
1905
1906 #if 0
1907 void cifs_delete_inode(struct inode *inode)
1908 {
1909         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1910         /* may have to add back in if and when safe distributed caching of
1911            directories added e.g. via FindNotify */
1912 }
1913 #endif