fs/cifs/inode.c

   1 /*
   2  *   fs/cifs/inode.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2008
   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         cifsInfo->delete_pending = pfindData->DeletePending ? true : false;
 510         cFYI(1, ("Old time %ld", cifsInfo->time));
 511         cifsInfo->time = jiffies;
 512         cFYI(1, ("New time %ld", cifsInfo->time));
 513
 514         /* blksize needs to be multiple of two. So safer to default to
 515         blksize and blkbits set in superblock so 2**blkbits and blksize
 516         will match rather than setting to:
 517         (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 518
 519         /* Linux can not store file creation time so ignore it */
 520         if (pfindData->LastAccessTime)
 521                 inode->i_atime = cifs_NTtimeToUnix
 522                         (le64_to_cpu(pfindData->LastAccessTime));
 523         else /* do not need to use current_fs_time - time not stored */
 524                 inode->i_atime = CURRENT_TIME;
 525         inode->i_mtime =
 526                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 527         inode->i_ctime =
 528             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 529         cFYI(DBG2, ("Attributes came in as 0x%x", attr));
 530         if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
 531                 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
 532                 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
 533         }
 534
 535         /* get default inode mode */
 536         if (attr & ATTR_DIRECTORY)
 537                 default_mode = cifs_sb->mnt_dir_mode;
 538         else
 539                 default_mode = cifs_sb->mnt_file_mode;
 540
 541         /* set permission bits */
 542         if (atomic_read(&cifsInfo->inUse) == 0 ||
 543             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
 544                 inode->i_mode = default_mode;
 545         else {
 546                 /* just reenable write bits if !ATTR_READONLY */
 547                 if ((inode->i_mode & S_IWUGO) == 0 &&
 548                     (attr & ATTR_READONLY) == 0)
 549                         inode->i_mode |= (S_IWUGO & default_mode);
 550
 551                 inode->i_mode &= ~S_IFMT;
 552         }
 553         /* clear write bits if ATTR_READONLY is set */
 554         if (attr & ATTR_READONLY)
 555                 inode->i_mode &= ~S_IWUGO;
 556
 557         /* set inode type */
 558         if ((attr & ATTR_SYSTEM) &&
 559             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
 560                 /* no need to fix endianness on 0 */
 561                 if (pfindData->EndOfFile == 0)
 562                         inode->i_mode |= S_IFIFO;
 563                 else if (decode_sfu_inode(inode,
 564                                 le64_to_cpu(pfindData->EndOfFile),
 565                                 full_path, cifs_sb, xid))
 566                         cFYI(1, ("unknown SFU file type\n"));
 567         } else {
 568                 if (attr & ATTR_DIRECTORY)
 569                         inode->i_mode |= S_IFDIR;
 570                 else
 571                         inode->i_mode |= S_IFREG;
 572         }
 573
 574         spin_lock(&inode->i_lock);
 575         if (is_size_safe_to_change(cifsInfo,
 576                                    le64_to_cpu(pfindData->EndOfFile))) {
 577                 /* can not safely shrink the file size here if the
 578                    client is writing to it due to potential races */
 579                 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
 580
 581                 /* 512 bytes (2**9) is the fake blocksize that must be
 582                    used for this calculation */
 583                 inode->i_blocks = (512 - 1 + le64_to_cpu(
 584                                    pfindData->AllocationSize)) >> 9;
 585         }
 586         spin_unlock(&inode->i_lock);
 587
 588         inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 589
 590         /* BB fill in uid and gid here? with help from winbind?
 591            or retrieve from NTFS stream extended attribute */
 592 #ifdef CONFIG_CIFS_EXPERIMENTAL
 593         /* fill in 0777 bits from ACL */
 594         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 595                 cFYI(1, ("Getting mode bits from ACL"));
 596                 acl_to_uid_mode(inode, full_path, pfid);
 597         }
 598 #endif
 599         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 600                 /* fill in remaining high mode bits e.g. SUID, VTX */
 601                 get_sfu_mode(inode, full_path, cifs_sb, xid);
 602         } else if (atomic_read(&cifsInfo->inUse) == 0) {
 603                 inode->i_uid = cifs_sb->mnt_uid;
 604                 inode->i_gid = cifs_sb->mnt_gid;
 605                 /* set so we do not keep refreshing these fields with
 606                    bad data after user has changed them in memory */
 607                 atomic_set(&cifsInfo->inUse, 1);
 608         }
 609
 610         cifs_set_ops(inode, is_dfs_referral);
 611
 612
 613
 614
 615 cgii_exit:
 616         kfree(buf);
 617         return rc;
 618 }
 619
 620 static const struct inode_operations cifs_ipc_inode_ops = {
 621         .lookup = cifs_lookup,
 622 };
 623
 624 static char *build_path_to_root(struct cifs_sb_info *cifs_sb)
 625 {
 626         int pplen = cifs_sb->prepathlen;
 627         int dfsplen;
 628         char *full_path = NULL;
 629
 630         /* if no prefix path, simply set path to the root of share to "" */
 631         if (pplen == 0) {
 632                 full_path = kmalloc(1, GFP_KERNEL);
 633                 if (full_path)
 634                         full_path[0] = 0;
 635                 return full_path;
 636         }
 637
 638         if (cifs_sb->tcon && (cifs_sb->tcon->Flags & SMB_SHARE_IS_IN_DFS))
 639                 dfsplen = strnlen(cifs_sb->tcon->treeName, MAX_TREE_SIZE + 1);
 640         else
 641                 dfsplen = 0;
 642
 643         full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
 644         if (full_path == NULL)
 645                 return full_path;
 646
 647         if (dfsplen) {
 648                 strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
 649                 /* switch slash direction in prepath depending on whether
 650                  * windows or posix style path names
 651                  */
 652                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
 653                         int i;
 654                         for (i = 0; i < dfsplen; i++) {
 655                                 if (full_path[i] == '\\')
 656                                         full_path[i] = '/';
 657                         }
 658                 }
 659         }
 660         strncpy(full_path + dfsplen, cifs_sb->prepath, pplen);
 661         full_path[dfsplen + pplen] = 0; /* add trailing null */
 662         return full_path;
 663 }
 664
 665 /* gets root inode */
 666 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
 667 {
 668         int xid;
 669         struct cifs_sb_info *cifs_sb;
 670         struct inode *inode;
 671         long rc;
 672         char *full_path;
 673
 674         inode = iget_locked(sb, ino);
 675         if (!inode)
 676                 return ERR_PTR(-ENOMEM);
 677         if (!(inode->i_state & I_NEW))
 678                 return inode;
 679
 680         cifs_sb = CIFS_SB(inode->i_sb);
 681         full_path = build_path_to_root(cifs_sb);
 682         if (full_path == NULL)
 683                 return ERR_PTR(-ENOMEM);
 684
 685         xid = GetXid();
 686         if (cifs_sb->tcon->unix_ext)
 687                 rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
 688                                                 xid);
 689         else
 690                 rc = cifs_get_inode_info(&inode, full_path, NULL, inode->i_sb,
 691                                                 xid, NULL);
 692         if (rc && cifs_sb->tcon->ipc) {
 693                 cFYI(1, ("ipc connection - fake read inode"));
 694                 inode->i_mode |= S_IFDIR;
 695                 inode->i_nlink = 2;
 696                 inode->i_op = &cifs_ipc_inode_ops;
 697                 inode->i_fop = &simple_dir_operations;
 698                 inode->i_uid = cifs_sb->mnt_uid;
 699                 inode->i_gid = cifs_sb->mnt_gid;
 700         } else if (rc) {
 701                 kfree(full_path);
 702                 _FreeXid(xid);
 703                 iget_failed(inode);
 704                 return ERR_PTR(rc);
 705         }
 706
 707         unlock_new_inode(inode);
 708
 709         kfree(full_path);
 710         /* can not call macro FreeXid here since in a void func
 711          * TODO: This is no longer true
 712          */
 713         _FreeXid(xid);
 714         return inode;
 715 }
 716
 717 static int
 718 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
 719                     char *full_path, __u32 dosattr)
 720 {
 721         int rc;
 722         int oplock = 0;
 723         __u16 netfid;
 724         __u32 netpid;
 725         bool set_time = false;
 726         struct cifsFileInfo *open_file;
 727         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 728         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 729         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 730         FILE_BASIC_INFO info_buf;
 731
 732         if (attrs->ia_valid & ATTR_ATIME) {
 733                 set_time = true;
 734                 info_buf.LastAccessTime =
 735                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
 736         } else
 737                 info_buf.LastAccessTime = 0;
 738
 739         if (attrs->ia_valid & ATTR_MTIME) {
 740                 set_time = true;
 741                 info_buf.LastWriteTime =
 742                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
 743         } else
 744                 info_buf.LastWriteTime = 0;
 745
 746         /*
 747          * Samba throws this field away, but windows may actually use it.
 748          * Do not set ctime unless other time stamps are changed explicitly
 749          * (i.e. by utimes()) since we would then have a mix of client and
 750          * server times.
 751          */
 752         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
 753                 cFYI(1, ("CIFS - CTIME changed"));
 754                 info_buf.ChangeTime =
 755                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
 756         } else
 757                 info_buf.ChangeTime = 0;
 758
 759         info_buf.CreationTime = 0;      /* don't change */
 760         info_buf.Attributes = cpu_to_le32(dosattr);
 761
 762         /*
 763          * If the file is already open for write, just use that fileid
 764          */
 765         open_file = find_writable_file(cifsInode);
 766         if (open_file) {
 767                 netfid = open_file->netfid;
 768                 netpid = open_file->pid;
 769                 goto set_via_filehandle;
 770         }
 771
 772         /*
 773          * NT4 apparently returns success on this call, but it doesn't
 774          * really work.
 775          */
 776         if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
 777                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
 778                                      &info_buf, cifs_sb->local_nls,
 779                                      cifs_sb->mnt_cifs_flags &
 780                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 781                 if (rc == 0) {
 782                         cifsInode->cifsAttrs = dosattr;
 783                         goto out;
 784                 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
 785                         goto out;
 786         }
 787
 788         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
 789                  "times not supported by this server"));
 790         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
 791                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
 792                          CREATE_NOT_DIR, &netfid, &oplock,
 793                          NULL, cifs_sb->local_nls,
 794                          cifs_sb->mnt_cifs_flags &
 795                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 796
 797         if (rc != 0) {
 798                 if (rc == -EIO)
 799                         rc = -EINVAL;
 800                 goto out;
 801         }
 802
 803         netpid = current->tgid;
 804
 805 set_via_filehandle:
 806         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
 807         if (!rc)
 808                 cifsInode->cifsAttrs = dosattr;
 809
 810         if (open_file == NULL)
 811                 CIFSSMBClose(xid, pTcon, netfid);
 812         else
 813                 atomic_dec(&open_file->wrtPending);
 814 out:
 815         return rc;
 816 }
 817
 818 /*
 819  * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 820  * and rename it to a random name that hopefully won't conflict with
 821  * anything else.
 822  */
 823 static int
 824 cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
 825 {
 826         int oplock = 0;
 827         int rc;
 828         __u16 netfid;
 829         struct inode *inode = dentry->d_inode;
 830         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 831         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 832         struct cifsTconInfo *tcon = cifs_sb->tcon;
 833         __u32 dosattr, origattr;
 834         FILE_BASIC_INFO *info_buf = NULL;
 835
 836         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 837                          DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
 838                          &netfid, &oplock, NULL, cifs_sb->local_nls,
 839                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 840         if (rc != 0)
 841                 goto out;
 842
 843         origattr = cifsInode->cifsAttrs;
 844         if (origattr == 0)
 845                 origattr |= ATTR_NORMAL;
 846
 847         dosattr = origattr & ~ATTR_READONLY;
 848         if (dosattr == 0)
 849                 dosattr |= ATTR_NORMAL;
 850         dosattr |= ATTR_HIDDEN;
 851
 852         /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
 853         if (dosattr != origattr) {
 854                 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
 855                 if (info_buf == NULL) {
 856                         rc = -ENOMEM;
 857                         goto out_close;
 858                 }
 859                 info_buf->Attributes = cpu_to_le32(dosattr);
 860                 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
 861                                         current->tgid);
 862                 /* although we would like to mark the file hidden
 863                    if that fails we will still try to rename it */
 864                 if (rc != 0)
 865                         cifsInode->cifsAttrs = dosattr;
 866                 else
 867                         dosattr = origattr; /* since not able to change them */
 868         }
 869
 870         /* rename the file */
 871         rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
 872                                    cifs_sb->mnt_cifs_flags &
 873                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 874         if (rc != 0) {
 875                 rc = -ETXTBSY;
 876                 goto undo_setattr;
 877         }
 878
 879         /* try to set DELETE_ON_CLOSE */
 880         if (!cifsInode->delete_pending) {
 881                 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
 882                                                current->tgid);
 883                 /*
 884                  * some samba versions return -ENOENT when we try to set the
 885                  * file disposition here. Likely a samba bug, but work around
 886                  * it for now. This means that some cifsXXX files may hang
 887                  * around after they shouldn't.
 888                  *
 889                  * BB: remove this hack after more servers have the fix
 890                  */
 891                 if (rc == -ENOENT)
 892                         rc = 0;
 893                 else if (rc != 0) {
 894                         rc = -ETXTBSY;
 895                         goto undo_rename;
 896                 }
 897                 cifsInode->delete_pending = true;
 898         }
 899
 900 out_close:
 901         CIFSSMBClose(xid, tcon, netfid);
 902 out:
 903         kfree(info_buf);
 904         return rc;
 905
 906         /*
 907          * reset everything back to the original state. Don't bother
 908          * dealing with errors here since we can't do anything about
 909          * them anyway.
 910          */
 911 undo_rename:
 912         CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
 913                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 914                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 915 undo_setattr:
 916         if (dosattr != origattr) {
 917                 info_buf->Attributes = cpu_to_le32(origattr);
 918                 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
 919                                         current->tgid))
 920                         cifsInode->cifsAttrs = origattr;
 921         }
 922
 923         goto out_close;
 924 }
 925
 926 int cifs_unlink(struct inode *dir, struct dentry *dentry)
 927 {
 928         int rc = 0;
 929         int xid;
 930         char *full_path = NULL;
 931         struct inode *inode = dentry->d_inode;
 932         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 933         struct super_block *sb = dir->i_sb;
 934         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 935         struct cifsTconInfo *tcon = cifs_sb->tcon;
 936         struct iattr *attrs = NULL;
 937         __u32 dosattr = 0, origattr = 0;
 938
 939         cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
 940
 941         xid = GetXid();
 942
 943         /* Unlink can be called from rename so we can not take the
 944          * sb->s_vfs_rename_mutex here */
 945         full_path = build_path_from_dentry(dentry);
 946         if (full_path == NULL) {
 947                 FreeXid(xid);
 948                 return -ENOMEM;
 949         }
 950
 951         if ((tcon->ses->capabilities & CAP_UNIX) &&
 952                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 953                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 954                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
 955                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 956                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 957                 cFYI(1, ("posix del rc %d", rc));
 958                 if ((rc == 0) || (rc == -ENOENT))
 959                         goto psx_del_no_retry;
 960         }
 961
 962 retry_std_delete:
 963         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 964                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 965
 966 psx_del_no_retry:
 967         if (!rc) {
 968                 if (inode)
 969                         drop_nlink(inode);
 970         } else if (rc == -ENOENT) {
 971                 d_drop(dentry);
 972         } else if (rc == -ETXTBSY) {
 973                 rc = cifs_rename_pending_delete(full_path, dentry, xid);
 974                 if (rc == 0)
 975                         drop_nlink(inode);
 976         } else if (rc == -EACCES && dosattr == 0) {
 977                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
 978                 if (attrs == NULL) {
 979                         rc = -ENOMEM;
 980                         goto out_reval;
 981                 }
 982
 983                 /* try to reset dos attributes */
 984                 origattr = cifsInode->cifsAttrs;
 985                 if (origattr == 0)
 986                         origattr |= ATTR_NORMAL;
 987                 dosattr = origattr & ~ATTR_READONLY;
 988                 if (dosattr == 0)
 989                         dosattr |= ATTR_NORMAL;
 990                 dosattr |= ATTR_HIDDEN;
 991
 992                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
 993                 if (rc != 0)
 994                         goto out_reval;
 995
 996                 goto retry_std_delete;
 997         }
 998
 999         /* undo the setattr if we errored out and it's needed */
1000         if (rc != 0 && dosattr != 0)
1001                 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1002
1003 out_reval:
1004         if (inode) {
1005                 cifsInode = CIFS_I(inode);
1006                 cifsInode->time = 0;    /* will force revalidate to get info
1007                                            when needed */
1008                 inode->i_ctime = current_fs_time(sb);
1009         }
1010         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1011         cifsInode = CIFS_I(dir);
1012         CIFS_I(dir)->time = 0;  /* force revalidate of dir as well */
1013
1014         kfree(full_path);
1015         kfree(attrs);
1016         FreeXid(xid);
1017         return rc;
1018 }
1019
1020 static void posix_fill_in_inode(struct inode *tmp_inode,
1021         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
1022 {
1023         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
1024         loff_t local_size;
1025         struct timespec local_mtime;
1026
1027         cifsInfo->time = jiffies;
1028         atomic_inc(&cifsInfo->inUse);
1029
1030         /* save mtime and size */
1031         local_mtime = tmp_inode->i_mtime;
1032         local_size  = tmp_inode->i_size;
1033
1034         cifs_unix_info_to_inode(tmp_inode, pData, 1);
1035         cifs_set_ops(tmp_inode, false);
1036
1037         if (!S_ISREG(tmp_inode->i_mode))
1038                 return;
1039
1040         /*
1041          * No sense invalidating pages for new inode
1042          * since we we have not started caching
1043          * readahead file data yet.
1044          */
1045         if (isNewInode)
1046                 return;
1047
1048         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
1049                 (local_size == tmp_inode->i_size)) {
1050                 cFYI(1, ("inode exists but unchanged"));
1051         } else {
1052                 /* file may have changed on server */
1053                 cFYI(1, ("invalidate inode, readdir detected change"));
1054                 invalidate_remote_inode(tmp_inode);
1055         }
1056 }
1057
1058 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
1059 {
1060         int rc = 0, tmprc;
1061         int xid;
1062         struct cifs_sb_info *cifs_sb;
1063         struct cifsTconInfo *pTcon;
1064         char *full_path = NULL;
1065         struct inode *newinode = NULL;
1066
1067         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
1068
1069         xid = GetXid();
1070
1071         cifs_sb = CIFS_SB(inode->i_sb);
1072         pTcon = cifs_sb->tcon;
1073
1074         full_path = build_path_from_dentry(direntry);
1075         if (full_path == NULL) {
1076                 FreeXid(xid);
1077                 return -ENOMEM;
1078         }
1079
1080         if ((pTcon->ses->capabilities & CAP_UNIX) &&
1081                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1082                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
1083                 u32 oplock = 0;
1084                 FILE_UNIX_BASIC_INFO *pInfo =
1085                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1086                 if (pInfo == NULL) {
1087                         rc = -ENOMEM;
1088                         goto mkdir_out;
1089                 }
1090
1091                 mode &= ~current->fs->umask;
1092                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1093                                 mode, NULL /* netfid */, pInfo, &oplock,
1094                                 full_path, cifs_sb->local_nls,
1095                                 cifs_sb->mnt_cifs_flags &
1096                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1097                 if (rc == -EOPNOTSUPP) {
1098                         kfree(pInfo);
1099                         goto mkdir_retry_old;
1100                 } else if (rc) {
1101                         cFYI(1, ("posix mkdir returned 0x%x", rc));
1102                         d_drop(direntry);
1103                 } else {
1104                         if (pInfo->Type == cpu_to_le32(-1)) {
1105                                 /* no return info, go query for it */
1106                                 kfree(pInfo);
1107                                 goto mkdir_get_info;
1108                         }
1109 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1110         to set uid/gid */
1111                         inc_nlink(inode);
1112                         if (pTcon->nocase)
1113                                 direntry->d_op = &cifs_ci_dentry_ops;
1114                         else
1115                                 direntry->d_op = &cifs_dentry_ops;
1116
1117                         newinode = new_inode(inode->i_sb);
1118                         if (newinode == NULL) {
1119                                 kfree(pInfo);
1120                                 goto mkdir_get_info;
1121                         }
1122
1123                         /* Is an i_ino of zero legal? */
1124                         /* Are there sanity checks we can use to ensure that
1125                            the server is really filling in that field? */
1126                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1127                                 newinode->i_ino =
1128                                         (unsigned long)pInfo->UniqueId;
1129                         } /* note ino incremented to unique num in new_inode */
1130                         if (inode->i_sb->s_flags & MS_NOATIME)
1131                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
1132                         newinode->i_nlink = 2;
1133
1134                         insert_inode_hash(newinode);
1135                         d_instantiate(direntry, newinode);
1136
1137                         /* we already checked in POSIXCreate whether
1138                            frame was long enough */
1139                         posix_fill_in_inode(direntry->d_inode,
1140                                         pInfo, 1 /* NewInode */);
1141 #ifdef CONFIG_CIFS_DEBUG2
1142                         cFYI(1, ("instantiated dentry %p %s to inode %p",
1143                                 direntry, direntry->d_name.name, newinode));
1144
1145                         if (newinode->i_nlink != 2)
1146                                 cFYI(1, ("unexpected number of links %d",
1147                                         newinode->i_nlink));
1148 #endif
1149                 }
1150                 kfree(pInfo);
1151                 goto mkdir_out;
1152         }
1153 mkdir_retry_old:
1154         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1155         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1156                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1157         if (rc) {
1158                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1159                 d_drop(direntry);
1160         } else {
1161 mkdir_get_info:
1162                 inc_nlink(inode);
1163                 if (pTcon->unix_ext)
1164                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1165                                                       inode->i_sb, xid);
1166                 else
1167                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1168                                                  inode->i_sb, xid, NULL);
1169
1170                 if (pTcon->nocase)
1171                         direntry->d_op = &cifs_ci_dentry_ops;
1172                 else
1173                         direntry->d_op = &cifs_dentry_ops;
1174                 d_instantiate(direntry, newinode);
1175                  /* setting nlink not necessary except in cases where we
1176                   * failed to get it from the server or was set bogus */
1177                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1178                                 direntry->d_inode->i_nlink = 2;
1179
1180                 mode &= ~current->fs->umask;
1181                 /* must turn on setgid bit if parent dir has it */
1182                 if (inode->i_mode & S_ISGID)
1183                         mode |= S_ISGID;
1184
1185                 if (pTcon->unix_ext) {
1186                         struct cifs_unix_set_info_args args = {
1187                                 .mode   = mode,
1188                                 .ctime  = NO_CHANGE_64,
1189                                 .atime  = NO_CHANGE_64,
1190                                 .mtime  = NO_CHANGE_64,
1191                                 .device = 0,
1192                         };
1193                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1194                                 args.uid = (__u64)current_fsuid();
1195                                 if (inode->i_mode & S_ISGID)
1196                                         args.gid = (__u64)inode->i_gid;
1197                                 else
1198                                         args.gid = (__u64)current_fsgid();
1199                         } else {
1200                                 args.uid = NO_CHANGE_64;
1201                                 args.gid = NO_CHANGE_64;
1202                         }
1203                         CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1204                                             cifs_sb->local_nls,
1205                                             cifs_sb->mnt_cifs_flags &
1206                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1207                 } else {
1208                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1209                             (mode & S_IWUGO) == 0) {
1210                                 FILE_BASIC_INFO pInfo;
1211                                 struct cifsInodeInfo *cifsInode;
1212                                 u32 dosattrs;
1213
1214                                 memset(&pInfo, 0, sizeof(pInfo));
1215                                 cifsInode = CIFS_I(newinode);
1216                                 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1217                                 pInfo.Attributes = cpu_to_le32(dosattrs);
1218                                 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1219                                                 full_path, &pInfo,
1220                                                 cifs_sb->local_nls,
1221                                                 cifs_sb->mnt_cifs_flags &
1222                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1223                                 if (tmprc == 0)
1224                                         cifsInode->cifsAttrs = dosattrs;
1225                         }
1226                         if (direntry->d_inode) {
1227                                 if (cifs_sb->mnt_cifs_flags &
1228                                      CIFS_MOUNT_DYNPERM)
1229                                         direntry->d_inode->i_mode =
1230                                                 (mode | S_IFDIR);
1231
1232                                 if (cifs_sb->mnt_cifs_flags &
1233                                      CIFS_MOUNT_SET_UID) {
1234                                         direntry->d_inode->i_uid =
1235                                                 current_fsuid();
1236                                         if (inode->i_mode & S_ISGID)
1237                                                 direntry->d_inode->i_gid =
1238                                                         inode->i_gid;
1239                                         else
1240                                                 direntry->d_inode->i_gid =
1241                                                         current_fsgid();
1242                                 }
1243                         }
1244                 }
1245         }
1246 mkdir_out:
1247         kfree(full_path);
1248         FreeXid(xid);
1249         return rc;
1250 }
1251
1252 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1253 {
1254         int rc = 0;
1255         int xid;
1256         struct cifs_sb_info *cifs_sb;
1257         struct cifsTconInfo *pTcon;
1258         char *full_path = NULL;
1259         struct cifsInodeInfo *cifsInode;
1260
1261         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1262
1263         xid = GetXid();
1264
1265         cifs_sb = CIFS_SB(inode->i_sb);
1266         pTcon = cifs_sb->tcon;
1267
1268         full_path = build_path_from_dentry(direntry);
1269         if (full_path == NULL) {
1270                 FreeXid(xid);
1271                 return -ENOMEM;
1272         }
1273
1274         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1275                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1276
1277         if (!rc) {
1278                 drop_nlink(inode);
1279                 spin_lock(&direntry->d_inode->i_lock);
1280                 i_size_write(direntry->d_inode, 0);
1281                 clear_nlink(direntry->d_inode);
1282                 spin_unlock(&direntry->d_inode->i_lock);
1283         }
1284
1285         cifsInode = CIFS_I(direntry->d_inode);
1286         cifsInode->time = 0;    /* force revalidate to go get info when
1287                                    needed */
1288         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1289                 current_fs_time(inode->i_sb);
1290
1291         kfree(full_path);
1292         FreeXid(xid);
1293         return rc;
1294 }
1295
1296 static int
1297 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1298                 struct dentry *to_dentry, const char *toPath)
1299 {
1300         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1301         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1302         __u16 srcfid;
1303         int oplock, rc;
1304
1305         /* try path-based rename first */
1306         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1307                            cifs_sb->mnt_cifs_flags &
1308                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1309
1310         /*
1311          * don't bother with rename by filehandle unless file is busy and
1312          * source Note that cross directory moves do not work with
1313          * rename by filehandle to various Windows servers.
1314          */
1315         if (rc == 0 || rc != -ETXTBSY)
1316                 return rc;
1317
1318         /* open the file to be renamed -- we need DELETE perms */
1319         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1320                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1321                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1322                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1323
1324         if (rc == 0) {
1325                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1326                                 (const char *) to_dentry->d_name.name,
1327                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1328                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1329
1330                 CIFSSMBClose(xid, pTcon, srcfid);
1331         }
1332
1333         return rc;
1334 }
1335
1336 int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1337         struct inode *target_dir, struct dentry *target_dentry)
1338 {
1339         char *fromName = NULL;
1340         char *toName = NULL;
1341         struct cifs_sb_info *cifs_sb_source;
1342         struct cifs_sb_info *cifs_sb_target;
1343         struct cifsTconInfo *tcon;
1344         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1345         FILE_UNIX_BASIC_INFO *info_buf_target;
1346         int xid, rc, tmprc;
1347
1348         cifs_sb_target = CIFS_SB(target_dir->i_sb);
1349         cifs_sb_source = CIFS_SB(source_dir->i_sb);
1350         tcon = cifs_sb_source->tcon;
1351
1352         xid = GetXid();
1353
1354         /*
1355          * BB: this might be allowed if same server, but different share.
1356          * Consider adding support for this
1357          */
1358         if (tcon != cifs_sb_target->tcon) {
1359                 rc = -EXDEV;
1360                 goto cifs_rename_exit;
1361         }
1362
1363         /*
1364          * we already have the rename sem so we do not need to
1365          * grab it again here to protect the path integrity
1366          */
1367         fromName = build_path_from_dentry(source_dentry);
1368         if (fromName == NULL) {
1369                 rc = -ENOMEM;
1370                 goto cifs_rename_exit;
1371         }
1372
1373         toName = build_path_from_dentry(target_dentry);
1374         if (toName == NULL) {
1375                 rc = -ENOMEM;
1376                 goto cifs_rename_exit;
1377         }
1378
1379         rc = cifs_do_rename(xid, source_dentry, fromName,
1380                             target_dentry, toName);
1381
1382         if (rc == -EEXIST && tcon->unix_ext) {
1383                 /*
1384                  * Are src and dst hardlinks of same inode? We can
1385                  * only tell with unix extensions enabled
1386                  */
1387                 info_buf_source =
1388                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1389                                         GFP_KERNEL);
1390                 if (info_buf_source == NULL) {
1391                         rc = -ENOMEM;
1392                         goto cifs_rename_exit;
1393                 }
1394
1395                 info_buf_target = info_buf_source + 1;
1396                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1397                                         info_buf_source,
1398                                         cifs_sb_source->local_nls,
1399                                         cifs_sb_source->mnt_cifs_flags &
1400                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1401                 if (tmprc != 0)
1402                         goto unlink_target;
1403
1404                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon,
1405                                         toName, info_buf_target,
1406                                         cifs_sb_target->local_nls,
1407                                         /* remap based on source sb */
1408                                         cifs_sb_source->mnt_cifs_flags &
1409                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1410
1411                 if (tmprc == 0 && (info_buf_source->UniqueId ==
1412                                    info_buf_target->UniqueId)) {
1413                         /* same file, POSIX says that this is a noop */
1414                         rc = 0;
1415                         goto cifs_rename_exit;
1416                 }
1417         } /* else ... BB we could add the same check for Windows by
1418                      checking the UniqueId via FILE_INTERNAL_INFO */
1419
1420 unlink_target:
1421         if ((rc == -EACCES) || (rc == -EEXIST)) {
1422                 tmprc = cifs_unlink(target_dir, target_dentry);
1423                 if (tmprc)
1424                         goto cifs_rename_exit;
1425
1426                 rc = cifs_do_rename(xid, source_dentry, fromName,
1427                                     target_dentry, toName);
1428         }
1429
1430 cifs_rename_exit:
1431         kfree(info_buf_source);
1432         kfree(fromName);
1433         kfree(toName);
1434         FreeXid(xid);
1435         return rc;
1436 }
1437
1438 int cifs_revalidate(struct dentry *direntry)
1439 {
1440         int xid;
1441         int rc = 0, wbrc = 0;
1442         char *full_path;
1443         struct cifs_sb_info *cifs_sb;
1444         struct cifsInodeInfo *cifsInode;
1445         loff_t local_size;
1446         struct timespec local_mtime;
1447         bool invalidate_inode = false;
1448
1449         if (direntry->d_inode == NULL)
1450                 return -ENOENT;
1451
1452         cifsInode = CIFS_I(direntry->d_inode);
1453
1454         if (cifsInode == NULL)
1455                 return -ENOENT;
1456
1457         /* no sense revalidating inode info on file that no one can write */
1458         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1459                 return rc;
1460
1461         xid = GetXid();
1462
1463         cifs_sb = CIFS_SB(direntry->d_sb);
1464
1465         /* can not safely grab the rename sem here if rename calls revalidate
1466            since that would deadlock */
1467         full_path = build_path_from_dentry(direntry);
1468         if (full_path == NULL) {
1469                 FreeXid(xid);
1470                 return -ENOMEM;
1471         }
1472         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1473                  "jiffies %ld", full_path, direntry->d_inode,
1474                  direntry->d_inode->i_count.counter, direntry,
1475                  direntry->d_time, jiffies));
1476
1477         if (cifsInode->time == 0) {
1478                 /* was set to zero previously to force revalidate */
1479         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1480                    lookupCacheEnabled) {
1481                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1482                     (direntry->d_inode->i_nlink == 1)) {
1483                         kfree(full_path);
1484                         FreeXid(xid);
1485                         return rc;
1486                 } else {
1487                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1488                 }
1489         }
1490
1491         /* save mtime and size */
1492         local_mtime = direntry->d_inode->i_mtime;
1493         local_size = direntry->d_inode->i_size;
1494
1495         if (cifs_sb->tcon->unix_ext) {
1496                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1497                                               direntry->d_sb, xid);
1498                 if (rc) {
1499                         cFYI(1, ("error on getting revalidate info %d", rc));
1500 /*                      if (rc != -ENOENT)
1501                                 rc = 0; */      /* BB should we cache info on
1502                                                    certain errors? */
1503                 }
1504         } else {
1505                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1506                                          direntry->d_sb, xid, NULL);
1507                 if (rc) {
1508                         cFYI(1, ("error on getting revalidate info %d", rc));
1509 /*                      if (rc != -ENOENT)
1510                                 rc = 0; */      /* BB should we cache info on
1511                                                    certain errors? */
1512                 }
1513         }
1514         /* should we remap certain errors, access denied?, to zero */
1515
1516         /* if not oplocked, we invalidate inode pages if mtime or file size
1517            had changed on server */
1518
1519         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1520             (local_size == direntry->d_inode->i_size)) {
1521                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1522         } else {
1523                 /* file may have changed on server */
1524                 if (cifsInode->clientCanCacheRead) {
1525                         /* no need to invalidate inode pages since we were the
1526                            only ones who could have modified the file and the
1527                            server copy is staler than ours */
1528                 } else {
1529                         invalidate_inode = true;
1530                 }
1531         }
1532
1533         /* can not grab this sem since kernel filesys locking documentation
1534            indicates i_mutex may be taken by the kernel on lookup and rename
1535            which could deadlock if we grab the i_mutex here as well */
1536 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1537         /* need to write out dirty pages here  */
1538         if (direntry->d_inode->i_mapping) {
1539                 /* do we need to lock inode until after invalidate completes
1540                    below? */
1541                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1542                 if (wbrc)
1543                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1544         }
1545         if (invalidate_inode) {
1546         /* shrink_dcache not necessary now that cifs dentry ops
1547         are exported for negative dentries */
1548 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1549                         shrink_dcache_parent(direntry); */
1550                 if (S_ISREG(direntry->d_inode->i_mode)) {
1551                         if (direntry->d_inode->i_mapping) {
1552                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1553                                 if (wbrc)
1554                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1555                         }
1556                         /* may eventually have to do this for open files too */
1557                         if (list_empty(&(cifsInode->openFileList))) {
1558                                 /* changed on server - flush read ahead pages */
1559                                 cFYI(1, ("Invalidating read ahead data on "
1560                                          "closed file"));
1561                                 invalidate_remote_inode(direntry->d_inode);
1562                         }
1563                 }
1564         }
1565 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1566
1567         kfree(full_path);
1568         FreeXid(xid);
1569         return rc;
1570 }
1571
1572 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1573         struct kstat *stat)
1574 {
1575         int err = cifs_revalidate(dentry);
1576         if (!err) {
1577                 generic_fillattr(dentry->d_inode, stat);
1578                 stat->blksize = CIFS_MAX_MSGSIZE;
1579         }
1580         return err;
1581 }
1582
1583 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1584 {
1585         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1586         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1587         struct page *page;
1588         int rc = 0;
1589
1590         page = grab_cache_page(mapping, index);
1591         if (!page)
1592                 return -ENOMEM;
1593
1594         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1595         unlock_page(page);
1596         page_cache_release(page);
1597         return rc;
1598 }
1599
1600 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1601 {
1602         struct address_space *mapping = inode->i_mapping;
1603         unsigned long limit;
1604
1605         spin_lock(&inode->i_lock);
1606         if (inode->i_size < offset)
1607                 goto do_expand;
1608         /*
1609          * truncation of in-use swapfiles is disallowed - it would cause
1610          * subsequent swapout to scribble on the now-freed blocks.
1611          */
1612         if (IS_SWAPFILE(inode)) {
1613                 spin_unlock(&inode->i_lock);
1614                 goto out_busy;
1615         }
1616         i_size_write(inode, offset);
1617         spin_unlock(&inode->i_lock);
1618         /*
1619          * unmap_mapping_range is called twice, first simply for efficiency
1620          * so that truncate_inode_pages does fewer single-page unmaps. However
1621          * after this first call, and before truncate_inode_pages finishes,
1622          * it is possible for private pages to be COWed, which remain after
1623          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1624          * call must be made for correctness.
1625          */
1626         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1627         truncate_inode_pages(mapping, offset);
1628         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1629         goto out_truncate;
1630
1631 do_expand:
1632         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1633         if (limit != RLIM_INFINITY && offset > limit) {
1634                 spin_unlock(&inode->i_lock);
1635                 goto out_sig;
1636         }
1637         if (offset > inode->i_sb->s_maxbytes) {
1638                 spin_unlock(&inode->i_lock);
1639                 goto out_big;
1640         }
1641         i_size_write(inode, offset);
1642         spin_unlock(&inode->i_lock);
1643 out_truncate:
1644         if (inode->i_op->truncate)
1645                 inode->i_op->truncate(inode);
1646         return 0;
1647 out_sig:
1648         send_sig(SIGXFSZ, current, 0);
1649 out_big:
1650         return -EFBIG;
1651 out_busy:
1652         return -ETXTBSY;
1653 }
1654
1655 static int
1656 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1657                    int xid, char *full_path)
1658 {
1659         int rc;
1660         struct cifsFileInfo *open_file;
1661         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1662         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1663         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1664
1665         /*
1666          * To avoid spurious oplock breaks from server, in the case of
1667          * inodes that we already have open, avoid doing path based
1668          * setting of file size if we can do it by handle.
1669          * This keeps our caching token (oplock) and avoids timeouts
1670          * when the local oplock break takes longer to flush
1671          * writebehind data than the SMB timeout for the SetPathInfo
1672          * request would allow
1673          */
1674         open_file = find_writable_file(cifsInode);
1675         if (open_file) {
1676                 __u16 nfid = open_file->netfid;
1677                 __u32 npid = open_file->pid;
1678                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1679                                         npid, false);
1680                 atomic_dec(&open_file->wrtPending);
1681                 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1682                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1683                         unsigned int bytes_written;
1684                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1685                                           &bytes_written, NULL, NULL, 1);
1686                         cFYI(1, ("Wrt seteof rc %d", rc));
1687                 }
1688         } else
1689                 rc = -EINVAL;
1690
1691         if (rc != 0) {
1692                 /* Set file size by pathname rather than by handle
1693                    either because no valid, writeable file handle for
1694                    it was found or because there was an error setting
1695                    it by handle */
1696                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1697                                    false, cifs_sb->local_nls,
1698                                    cifs_sb->mnt_cifs_flags &
1699                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1700                 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1701                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1702                         __u16 netfid;
1703                         int oplock = 0;
1704
1705                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1706                                 FILE_OPEN, GENERIC_WRITE,
1707                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1708                                 cifs_sb->local_nls,
1709                                 cifs_sb->mnt_cifs_flags &
1710                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1711                         if (rc == 0) {
1712                                 unsigned int bytes_written;
1713                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1714                                                   attrs->ia_size,
1715                                                   &bytes_written, NULL,
1716                                                   NULL, 1);
1717                                 cFYI(1, ("wrt seteof rc %d", rc));
1718                                 CIFSSMBClose(xid, pTcon, netfid);
1719                         }
1720                 }
1721         }
1722
1723         if (rc == 0) {
1724                 rc = cifs_vmtruncate(inode, attrs->ia_size);
1725                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1726         }
1727
1728         return rc;
1729 }
1730
1731 static int
1732 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1733 {
1734         int rc;
1735         int xid;
1736         char *full_path = NULL;
1737         struct inode *inode = direntry->d_inode;
1738         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1739         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1740         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1741         struct cifs_unix_set_info_args *args = NULL;
1742
1743         cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1744                  direntry->d_name.name, attrs->ia_valid));
1745
1746         xid = GetXid();
1747
1748         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1749                 /* check if we have permission to change attrs */
1750                 rc = inode_change_ok(inode, attrs);
1751                 if (rc < 0)
1752                         goto out;
1753                 else
1754                         rc = 0;
1755         }
1756
1757         full_path = build_path_from_dentry(direntry);
1758         if (full_path == NULL) {
1759                 rc = -ENOMEM;
1760                 goto out;
1761         }
1762
1763         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1764                 /*
1765                    Flush data before changing file size or changing the last
1766                    write time of the file on the server. If the
1767                    flush returns error, store it to report later and continue.
1768                    BB: This should be smarter. Why bother flushing pages that
1769                    will be truncated anyway? Also, should we error out here if
1770                    the flush returns error?
1771                  */
1772                 rc = filemap_write_and_wait(inode->i_mapping);
1773                 if (rc != 0) {
1774                         cifsInode->write_behind_rc = rc;
1775                         rc = 0;
1776                 }
1777         }
1778
1779         if (attrs->ia_valid & ATTR_SIZE) {
1780                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1781                 if (rc != 0)
1782                         goto out;
1783         }
1784
1785         /* skip mode change if it's just for clearing setuid/setgid */
1786         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1787                 attrs->ia_valid &= ~ATTR_MODE;
1788
1789         args = kmalloc(sizeof(*args), GFP_KERNEL);
1790         if (args == NULL) {
1791                 rc = -ENOMEM;
1792                 goto out;
1793         }
1794
1795         /* set up the struct */
1796         if (attrs->ia_valid & ATTR_MODE)
1797                 args->mode = attrs->ia_mode;
1798         else
1799                 args->mode = NO_CHANGE_64;
1800
1801         if (attrs->ia_valid & ATTR_UID)
1802                 args->uid = attrs->ia_uid;
1803         else
1804                 args->uid = NO_CHANGE_64;
1805
1806         if (attrs->ia_valid & ATTR_GID)
1807                 args->gid = attrs->ia_gid;
1808         else
1809                 args->gid = NO_CHANGE_64;
1810
1811         if (attrs->ia_valid & ATTR_ATIME)
1812                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1813         else
1814                 args->atime = NO_CHANGE_64;
1815
1816         if (attrs->ia_valid & ATTR_MTIME)
1817                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1818         else
1819                 args->mtime = NO_CHANGE_64;
1820
1821         if (attrs->ia_valid & ATTR_CTIME)
1822                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1823         else
1824                 args->ctime = NO_CHANGE_64;
1825
1826         args->device = 0;
1827         rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1828                                 cifs_sb->local_nls,
1829                                 cifs_sb->mnt_cifs_flags &
1830                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1831
1832         if (!rc)
1833                 rc = inode_setattr(inode, attrs);
1834 out:
1835         kfree(args);
1836         kfree(full_path);
1837         FreeXid(xid);
1838         return rc;
1839 }
1840
1841 static int
1842 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1843 {
1844         int xid;
1845         struct inode *inode = direntry->d_inode;
1846         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1847         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1848         char *full_path = NULL;
1849         int rc = -EACCES;
1850         __u32 dosattr = 0;
1851         __u64 mode = NO_CHANGE_64;
1852
1853         xid = GetXid();
1854
1855         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1856                  direntry->d_name.name, attrs->ia_valid));
1857
1858         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1859                 /* check if we have permission to change attrs */
1860                 rc = inode_change_ok(inode, attrs);
1861                 if (rc < 0) {
1862                         FreeXid(xid);
1863                         return rc;
1864                 } else
1865                         rc = 0;
1866         }
1867
1868         full_path = build_path_from_dentry(direntry);
1869         if (full_path == NULL) {
1870                 FreeXid(xid);
1871                 return -ENOMEM;
1872         }
1873
1874         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1875                 /*
1876                    Flush data before changing file size or changing the last
1877                    write time of the file on the server. If the
1878                    flush returns error, store it to report later and continue.
1879                    BB: This should be smarter. Why bother flushing pages that
1880                    will be truncated anyway? Also, should we error out here if
1881                    the flush returns error?
1882                  */
1883                 rc = filemap_write_and_wait(inode->i_mapping);
1884                 if (rc != 0) {
1885                         cifsInode->write_behind_rc = rc;
1886                         rc = 0;
1887                 }
1888         }
1889
1890         if (attrs->ia_valid & ATTR_SIZE) {
1891                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1892                 if (rc != 0)
1893                         goto cifs_setattr_exit;
1894         }
1895
1896         /*
1897          * Without unix extensions we can't send ownership changes to the
1898          * server, so silently ignore them. This is consistent with how
1899          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1900          * CIFSACL support + proper Windows to Unix idmapping, we may be
1901          * able to support this in the future.
1902          */
1903         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1904                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1905
1906         /* skip mode change if it's just for clearing setuid/setgid */
1907         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1908                 attrs->ia_valid &= ~ATTR_MODE;
1909
1910         if (attrs->ia_valid & ATTR_MODE) {
1911                 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1912                 mode = attrs->ia_mode;
1913         }
1914
1915         if (attrs->ia_valid & ATTR_MODE) {
1916                 rc = 0;
1917 #ifdef CONFIG_CIFS_EXPERIMENTAL
1918                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1919                         rc = mode_to_acl(inode, full_path, mode);
1920                 else
1921 #endif
1922                 if (((mode & S_IWUGO) == 0) &&
1923                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1924
1925                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1926
1927                         /* fix up mode if we're not using dynperm */
1928                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1929                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1930                 } else if ((mode & S_IWUGO) &&
1931                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
1932
1933                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1934                         /* Attributes of 0 are ignored */
1935                         if (dosattr == 0)
1936                                 dosattr |= ATTR_NORMAL;
1937
1938                         /* reset local inode permissions to normal */
1939                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1940                                 attrs->ia_mode &= ~(S_IALLUGO);
1941                                 if (S_ISDIR(inode->i_mode))
1942                                         attrs->ia_mode |=
1943                                                 cifs_sb->mnt_dir_mode;
1944                                 else
1945                                         attrs->ia_mode |=
1946                                                 cifs_sb->mnt_file_mode;
1947                         }
1948                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1949                         /* ignore mode change - ATTR_READONLY hasn't changed */
1950                         attrs->ia_valid &= ~ATTR_MODE;
1951                 }
1952         }
1953
1954         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1955             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1956                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1957                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1958
1959                 /* Even if error on time set, no sense failing the call if
1960                 the server would set the time to a reasonable value anyway,
1961                 and this check ensures that we are not being called from
1962                 sys_utimes in which case we ought to fail the call back to
1963                 the user when the server rejects the call */
1964                 if ((rc) && (attrs->ia_valid &
1965                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1966                         rc = 0;
1967         }
1968
1969         /* do not need local check to inode_check_ok since the server does
1970            that */
1971         if (!rc)
1972                 rc = inode_setattr(inode, attrs);
1973 cifs_setattr_exit:
1974         kfree(full_path);
1975         FreeXid(xid);
1976         return rc;
1977 }
1978
1979 int
1980 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1981 {
1982         struct inode *inode = direntry->d_inode;
1983         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1984         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1985
1986         if (pTcon->unix_ext)
1987                 return cifs_setattr_unix(direntry, attrs);
1988
1989         return cifs_setattr_nounix(direntry, attrs);
1990
1991         /* BB: add cifs_setattr_legacy for really old servers */
1992 }
1993
1994 #if 0
1995 void cifs_delete_inode(struct inode *inode)
1996 {
1997         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1998         /* may have to add back in if and when safe distributed caching of
1999            directories added e.g. via FindNotify */
2000 }
2001 #endif