fs/cifs/inode.c

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