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