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   1 /*
   2  *   fs/cifs/inode.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2007
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21 #include <linux/fs.h>
  22 #include <linux/stat.h>
  23 #include <linux/pagemap.h>
  24 #include <asm/div64.h>
  25 #include "cifsfs.h"
  26 #include "cifspdu.h"
  27 #include "cifsglob.h"
  28 #include "cifsproto.h"
  29 #include "cifs_debug.h"
  30 #include "cifs_fs_sb.h"
  31
  32
  33 static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
  34 {
  35         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  36
  37         switch (inode->i_mode & S_IFMT) {
  38         case S_IFREG:
  39                 inode->i_op = &cifs_file_inode_ops;
  40                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
  41                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  42                                 inode->i_fop = &cifs_file_direct_nobrl_ops;
  43                         else
  44                                 inode->i_fop = &cifs_file_direct_ops;
  45                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  46                         inode->i_fop = &cifs_file_nobrl_ops;
  47                 else { /* not direct, send byte range locks */
  48                         inode->i_fop = &cifs_file_ops;
  49                 }
  50
  51
  52                 /* check if server can support readpages */
  53                 if (cifs_sb->tcon->ses->server->maxBuf <
  54                                 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
  55                         inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
  56                 else
  57                         inode->i_data.a_ops = &cifs_addr_ops;
  58                 break;
  59         case S_IFDIR:
  60 #ifdef CONFIG_CIFS_DFS_UPCALL
  61                 if (is_dfs_referral) {
  62                         inode->i_op = &cifs_dfs_referral_inode_operations;
  63                 } else {
  64 #else /* NO DFS support, treat as a directory */
  65                 {
  66 #endif
  67                         inode->i_op = &cifs_dir_inode_ops;
  68                         inode->i_fop = &cifs_dir_ops;
  69                 }
  70                 break;
  71         case S_IFLNK:
  72                 inode->i_op = &cifs_symlink_inode_ops;
  73                 break;
  74         default:
  75                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  76                 break;
  77         }
  78 }
  79
  80 static void cifs_unix_info_to_inode(struct inode *inode,
  81                 FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
  82 {
  83         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  84         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
  85         __u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
  86         __u64 end_of_file = le64_to_cpu(info->EndOfFile);
  87
  88         inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(info->LastAccessTime));
  89         inode->i_mtime =
  90                 cifs_NTtimeToUnix(le64_to_cpu(info->LastModificationTime));
  91         inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(info->LastStatusChange));
  92         inode->i_mode = le64_to_cpu(info->Permissions);
  93
  94         /*
  95          * Since we set the inode type below we need to mask off
  96          * to avoid strange results if bits set above.
  97          */
  98         inode->i_mode &= ~S_IFMT;
  99         switch (le32_to_cpu(info->Type)) {
 100         case UNIX_FILE:
 101                 inode->i_mode |= S_IFREG;
 102                 break;
 103         case UNIX_SYMLINK:
 104                 inode->i_mode |= S_IFLNK;
 105                 break;
 106         case UNIX_DIR:
 107                 inode->i_mode |= S_IFDIR;
 108                 break;
 109         case UNIX_CHARDEV:
 110                 inode->i_mode |= S_IFCHR;
 111                 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 112                                       le64_to_cpu(info->DevMinor) & MINORMASK);
 113                 break;
 114         case UNIX_BLOCKDEV:
 115                 inode->i_mode |= S_IFBLK;
 116                 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 117                                       le64_to_cpu(info->DevMinor) & MINORMASK);
 118                 break;
 119         case UNIX_FIFO:
 120                 inode->i_mode |= S_IFIFO;
 121                 break;
 122         case UNIX_SOCKET:
 123                 inode->i_mode |= S_IFSOCK;
 124                 break;
 125         default:
 126                 /* safest to call it a file if we do not know */
 127                 inode->i_mode |= S_IFREG;
 128                 cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
 129                 break;
 130         }
 131
 132         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
 133             !force_uid_gid)
 134                 inode->i_uid = cifs_sb->mnt_uid;
 135         else
 136                 inode->i_uid = le64_to_cpu(info->Uid);
 137
 138         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
 139             !force_uid_gid)
 140                 inode->i_gid = cifs_sb->mnt_gid;
 141         else
 142                 inode->i_gid = le64_to_cpu(info->Gid);
 143
 144         inode->i_nlink = le64_to_cpu(info->Nlinks);
 145
 146         spin_lock(&inode->i_lock);
 147         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 148                 /*
 149                  * We can not safely change the file size here if the client
 150                  * is writing to it due to potential races.
 151                  */
 152                 i_size_write(inode, end_of_file);
 153
 154                 /*
 155                  * i_blocks is not related to (i_size / i_blksize),
 156                  * but instead 512 byte (2**9) size is required for
 157                  * calculating num blocks.
 158                  */
 159                 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 160         }
 161         spin_unlock(&inode->i_lock);
 162 }
 163
 164
 165 /*
 166  *      Needed to setup inode data for the directory which is the
 167  *      junction to the new submount (ie to setup the fake directory
 168  *      which represents a DFS referral)
 169  */
 170 static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
 171                                struct super_block *sb)
 172 {
 173         struct inode *pinode = NULL;
 174
 175         memset(pfnd_dat, 0, sizeof(FILE_UNIX_BASIC_INFO));
 176
 177 /*      __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
 178         __le64 pfnd_dat->NumOfBytes = cpu_to_le64(0);
 179         __u64 UniqueId = 0;  */
 180         pfnd_dat->LastStatusChange =
 181                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 182         pfnd_dat->LastAccessTime =
 183                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 184         pfnd_dat->LastModificationTime =
 185                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 186         pfnd_dat->Type = cpu_to_le32(UNIX_DIR);
 187         pfnd_dat->Permissions = cpu_to_le64(S_IXUGO | S_IRWXU);
 188         pfnd_dat->Nlinks = cpu_to_le64(2);
 189         if (sb->s_root)
 190                 pinode = sb->s_root->d_inode;
 191         if (pinode == NULL)
 192                 return;
 193
 194         /* fill in default values for the remaining based on root
 195            inode since we can not query the server for this inode info */
 196         pfnd_dat->DevMajor = cpu_to_le64(MAJOR(pinode->i_rdev));
 197         pfnd_dat->DevMinor = cpu_to_le64(MINOR(pinode->i_rdev));
 198         pfnd_dat->Uid = cpu_to_le64(pinode->i_uid);
 199         pfnd_dat->Gid = cpu_to_le64(pinode->i_gid);
 200 }
 201
 202 int cifs_get_inode_info_unix(struct inode **pinode,
 203         const unsigned char *full_path, struct super_block *sb, int xid)
 204 {
 205         int rc = 0;
 206         FILE_UNIX_BASIC_INFO find_data;
 207         struct cifsTconInfo *pTcon;
 208         struct inode *inode;
 209         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 210         bool is_dfs_referral = false;
 211         struct cifsInodeInfo *cifsInfo;
 212         __u64 num_of_bytes;
 213         __u64 end_of_file;
 214
 215         pTcon = cifs_sb->tcon;
 216         cFYI(1, ("Getting info on %s", full_path));
 217
 218         /* could have done a find first instead but this returns more info */
 219         rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &find_data,
 220                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 221                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 222         if (rc == -EREMOTE && !is_dfs_referral) {
 223                 is_dfs_referral = true;
 224                 cFYI(DBG2, ("DFS ref"));
 225                 /* for DFS, server does not give us real inode data */
 226                 fill_fake_finddataunix(&find_data, sb);
 227                 rc = 0;
 228         } else if (rc)
 229                 goto cgiiu_exit;
 230
 231         num_of_bytes = le64_to_cpu(find_data.NumOfBytes);
 232         end_of_file = le64_to_cpu(find_data.EndOfFile);
 233
 234         /* get new inode */
 235         if (*pinode == NULL) {
 236                 *pinode = new_inode(sb);
 237                 if (*pinode == NULL) {
 238                         rc = -ENOMEM;
 239                         goto cgiiu_exit;
 240                 }
 241                 /* Is an i_ino of zero legal? */
 242                 /* note ino incremented to unique num in new_inode */
 243                 /* Are there sanity checks we can use to ensure that
 244                    the server is really filling in that field? */
 245                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 246                         (*pinode)->i_ino = (unsigned long)find_data.UniqueId;
 247
 248                 if (sb->s_flags & MS_NOATIME)
 249                         (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
 250
 251                 insert_inode_hash(*pinode);
 252         }
 253
 254         inode = *pinode;
 255         cifsInfo = CIFS_I(inode);
 256
 257         cFYI(1, ("Old time %ld", cifsInfo->time));
 258         cifsInfo->time = jiffies;
 259         cFYI(1, ("New time %ld", cifsInfo->time));
 260         /* this is ok to set on every inode revalidate */
 261         atomic_set(&cifsInfo->inUse, 1);
 262
 263         cifs_unix_info_to_inode(inode, &find_data, 0);
 264
 265         if (num_of_bytes < end_of_file)
 266                 cFYI(1, ("allocation size less than end of file"));
 267         cFYI(1, ("Size %ld and blocks %llu",
 268                 (unsigned long) inode->i_size,
 269                 (unsigned long long)inode->i_blocks));
 270
 271         cifs_set_ops(inode, is_dfs_referral);
 272 cgiiu_exit:
 273         return rc;
 274 }
 275
 276 static int decode_sfu_inode(struct inode *inode, __u64 size,
 277                             const unsigned char *path,
 278                             struct cifs_sb_info *cifs_sb, int xid)
 279 {
 280         int rc;
 281         int oplock = 0;
 282         __u16 netfid;
 283         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 284         char buf[24];
 285         unsigned int bytes_read;
 286         char *pbuf;
 287
 288         pbuf = buf;
 289
 290         if (size == 0) {
 291                 inode->i_mode |= S_IFIFO;
 292                 return 0;
 293         } else if (size < 8) {
 294                 return -EINVAL;  /* EOPNOTSUPP? */
 295         }
 296
 297         rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
 298                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 299                          cifs_sb->local_nls,
 300                          cifs_sb->mnt_cifs_flags &
 301                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 302         if (rc == 0) {
 303                 int buf_type = CIFS_NO_BUFFER;
 304                         /* Read header */
 305                 rc = CIFSSMBRead(xid, pTcon,
 306                                  netfid,
 307                                  24 /* length */, 0 /* offset */,
 308                                  &bytes_read, &pbuf, &buf_type);
 309                 if ((rc == 0) && (bytes_read >= 8)) {
 310                         if (memcmp("IntxBLK", pbuf, 8) == 0) {
 311                                 cFYI(1, ("Block device"));
 312                                 inode->i_mode |= S_IFBLK;
 313                                 if (bytes_read == 24) {
 314                                         /* we have enough to decode dev num */
 315                                         __u64 mjr; /* major */
 316                                         __u64 mnr; /* minor */
 317                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 318                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 319                                         inode->i_rdev = MKDEV(mjr, mnr);
 320                                 }
 321                         } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
 322                                 cFYI(1, ("Char device"));
 323                                 inode->i_mode |= S_IFCHR;
 324                                 if (bytes_read == 24) {
 325                                         /* we have enough to decode dev num */
 326                                         __u64 mjr; /* major */
 327                                         __u64 mnr; /* minor */
 328                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 329                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 330                                         inode->i_rdev = MKDEV(mjr, mnr);
 331                                 }
 332                         } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
 333                                 cFYI(1, ("Symlink"));
 334                                 inode->i_mode |= S_IFLNK;
 335                         } else {
 336                                 inode->i_mode |= S_IFREG; /* file? */
 337                                 rc = -EOPNOTSUPP;
 338                         }
 339                 } else {
 340                         inode->i_mode |= S_IFREG; /* then it is a file */
 341                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 342                 }
 343                 CIFSSMBClose(xid, pTcon, netfid);
 344         }
 345         return rc;
 346 }
 347
 348 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 349
 350 static int get_sfu_mode(struct inode *inode,
 351                         const unsigned char *path,
 352                         struct cifs_sb_info *cifs_sb, int xid)
 353 {
 354 #ifdef CONFIG_CIFS_XATTR
 355         ssize_t rc;
 356         char ea_value[4];
 357         __u32 mode;
 358
 359         rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
 360                         ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 361                 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 362         if (rc < 0)
 363                 return (int)rc;
 364         else if (rc > 3) {
 365                 mode = le32_to_cpu(*((__le32 *)ea_value));
 366                 inode->i_mode &= ~SFBITS_MASK;
 367                 cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
 368                 inode->i_mode = (mode &  SFBITS_MASK) | inode->i_mode;
 369                 cFYI(1, ("special mode bits 0%o", mode));
 370                 return 0;
 371         } else {
 372                 return 0;
 373         }
 374 #else
 375         return -EOPNOTSUPP;
 376 #endif
 377 }
 378
 379 /*
 380  *      Needed to setup inode data for the directory which is the
 381  *      junction to the new submount (ie to setup the fake directory
 382  *      which represents a DFS referral)
 383  */
 384 static void fill_fake_finddata(FILE_ALL_INFO *pfnd_dat,
 385                                struct super_block *sb)
 386 {
 387         memset(pfnd_dat, 0, sizeof(FILE_ALL_INFO));
 388
 389 /*      __le64 pfnd_dat->AllocationSize = cpu_to_le64(0);
 390         __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
 391         __u8 pfnd_dat->DeletePending = 0;
 392         __u8 pfnd_data->Directory = 0;
 393         __le32 pfnd_dat->EASize = 0;
 394         __u64 pfnd_dat->IndexNumber = 0;
 395         __u64 pfnd_dat->IndexNumber1 = 0;  */
 396         pfnd_dat->CreationTime =
 397                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 398         pfnd_dat->LastAccessTime =
 399                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 400         pfnd_dat->LastWriteTime =
 401                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 402         pfnd_dat->ChangeTime =
 403                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 404         pfnd_dat->Attributes = cpu_to_le32(ATTR_DIRECTORY);
 405         pfnd_dat->NumberOfLinks = cpu_to_le32(2);
 406 }
 407
 408 int cifs_get_inode_info(struct inode **pinode,
 409         const unsigned char *full_path, FILE_ALL_INFO *pfindData,
 410         struct super_block *sb, int xid, const __u16 *pfid)
 411 {
 412         int rc = 0;
 413         __u32 attr;
 414         struct cifsInodeInfo *cifsInfo;
 415         struct cifsTconInfo *pTcon;
 416         struct inode *inode;
 417         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 418         char *buf = NULL;
 419         bool adjustTZ = false;
 420         bool is_dfs_referral = false;
 421         umode_t default_mode;
 422
 423         pTcon = cifs_sb->tcon;
 424         cFYI(1, ("Getting info on %s", full_path));
 425
 426         if ((pfindData == NULL) && (*pinode != NULL)) {
 427                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 428                         cFYI(1, ("No need to revalidate cached inode sizes"));
 429                         return rc;
 430                 }
 431         }
 432
 433         /* if file info not passed in then get it from server */
 434         if (pfindData == NULL) {
 435                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 436                 if (buf == NULL)
 437                         return -ENOMEM;
 438                 pfindData = (FILE_ALL_INFO *)buf;
 439
 440                 /* could do find first instead but this returns more info */
 441                 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
 442                               0 /* not legacy */,
 443                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 444                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 445                 /* BB optimize code so we do not make the above call
 446                 when server claims no NT SMB support and the above call
 447                 failed at least once - set flag in tcon or mount */
 448                 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 449                         rc = SMBQueryInformation(xid, pTcon, full_path,
 450                                         pfindData, cifs_sb->local_nls,
 451                                         cifs_sb->mnt_cifs_flags &
 452                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 453                         adjustTZ = true;
 454                 }
 455         }
 456         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
 457         if (rc == -EREMOTE) {
 458                 is_dfs_referral = true;
 459                 fill_fake_finddata(pfindData, sb);
 460                 rc = 0;
 461         } else if (rc)
 462                 goto cgii_exit;
 463
 464         attr = le32_to_cpu(pfindData->Attributes);
 465
 466         /* get new inode */
 467         if (*pinode == NULL) {
 468                 *pinode = new_inode(sb);
 469                 if (*pinode == NULL) {
 470                         rc = -ENOMEM;
 471                         goto cgii_exit;
 472                 }
 473                 /* Is an i_ino of zero legal? Can we use that to check
 474                    if the server supports returning inode numbers?  Are
 475                    there other sanity checks we can use to ensure that
 476                    the server is really filling in that field? */
 477
 478                 /* We can not use the IndexNumber field by default from
 479                    Windows or Samba (in ALL_INFO buf) but we can request
 480                    it explicitly.  It may not be unique presumably if
 481                    the server has multiple devices mounted under one share */
 482
 483                 /* There may be higher info levels that work but are
 484                    there Windows server or network appliances for which
 485                    IndexNumber field is not guaranteed unique? */
 486
 487                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 488                         int rc1 = 0;
 489                         __u64 inode_num;
 490
 491                         rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 492                                         full_path, &inode_num,
 493                                         cifs_sb->local_nls,
 494                                         cifs_sb->mnt_cifs_flags &
 495                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 496                         if (rc1) {
 497                                 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
 498                                 /* BB EOPNOSUPP disable SERVER_INUM? */
 499                         } else /* do we need cast or hash to ino? */
 500                                 (*pinode)->i_ino = inode_num;
 501                 } /* else ino incremented to unique num in new_inode*/
 502                 if (sb->s_flags & MS_NOATIME)
 503                         (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
 504                 insert_inode_hash(*pinode);
 505         }
 506         inode = *pinode;
 507         cifsInfo = CIFS_I(inode);
 508         cifsInfo->cifsAttrs = attr;
 509         cFYI(1, ("Old time %ld", cifsInfo->time));
 510         cifsInfo->time = jiffies;
 511         cFYI(1, ("New time %ld", cifsInfo->time));
 512
 513         /* blksize needs to be multiple of two. So safer to default to
 514         blksize and blkbits set in superblock so 2**blkbits and blksize
 515         will match rather than setting to:
 516         (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 517
 518         /* Linux can not store file creation time so ignore it */
 519         if (pfindData->LastAccessTime)
 520                 inode->i_atime = cifs_NTtimeToUnix
 521                         (le64_to_cpu(pfindData->LastAccessTime));
 522         else /* do not need to use current_fs_time - time not stored */
 523                 inode->i_atime = CURRENT_TIME;
 524         inode->i_mtime =
 525                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 526         inode->i_ctime =
 527             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 528         cFYI(DBG2, ("Attributes came in as 0x%x", attr));
 529         if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
 530                 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
 531                 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
 532         }
 533
 534         /* get default inode mode */
 535         if (attr & ATTR_DIRECTORY)
 536                 default_mode = cifs_sb->mnt_dir_mode;
 537         else
 538                 default_mode = cifs_sb->mnt_file_mode;
 539
 540         /* set permission bits */
 541         if (atomic_read(&cifsInfo->inUse) == 0 ||
 542             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
 543                 inode->i_mode = default_mode;
 544         else {
 545                 /* just reenable write bits if !ATTR_READONLY */
 546                 if ((inode->i_mode & S_IWUGO) == 0 &&
 547                     (attr & ATTR_READONLY) == 0)
 548                         inode->i_mode |= (S_IWUGO & default_mode);
 549
 550                 inode->i_mode &= ~S_IFMT;
 551         }
 552         /* clear write bits if ATTR_READONLY is set */
 553         if (attr & ATTR_READONLY)
 554                 inode->i_mode &= ~S_IWUGO;
 555
 556         /* set inode type */
 557         if ((attr & ATTR_SYSTEM) &&
 558             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
 559                 /* no need to fix endianness on 0 */
 560                 if (pfindData->EndOfFile == 0)
 561                         inode->i_mode |= S_IFIFO;
 562                 else if (decode_sfu_inode(inode,
 563                                 le64_to_cpu(pfindData->EndOfFile),
 564                                 full_path, cifs_sb, xid))
 565                         cFYI(1, ("unknown SFU file type\n"));
 566         } else {
 567                 if (attr & ATTR_DIRECTORY)
 568                         inode->i_mode |= S_IFDIR;
 569                 else
 570                         inode->i_mode |= S_IFREG;
 571         }
 572
 573         spin_lock(&inode->i_lock);
 574         if (is_size_safe_to_change(cifsInfo,
 575                                    le64_to_cpu(pfindData->EndOfFile))) {
 576                 /* can not safely shrink the file size here if the
 577                    client is writing to it due to potential races */
 578                 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
 579
 580                 /* 512 bytes (2**9) is the fake blocksize that must be
 581                    used for this calculation */
 582                 inode->i_blocks = (512 - 1 + le64_to_cpu(
 583                                    pfindData->AllocationSize)) >> 9;
 584         }
 585         spin_unlock(&inode->i_lock);
 586
 587         inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 588
 589         /* BB fill in uid and gid here? with help from winbind?
 590            or retrieve from NTFS stream extended attribute */
 591 #ifdef CONFIG_CIFS_EXPERIMENTAL
 592         /* fill in 0777 bits from ACL */
 593         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 594                 cFYI(1, ("Getting mode bits from ACL"));
 595                 acl_to_uid_mode(inode, full_path, pfid);
 596         }
 597 #endif
 598         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 599                 /* fill in remaining high mode bits e.g. SUID, VTX */
 600                 get_sfu_mode(inode, full_path, cifs_sb, xid);
 601         } else if (atomic_read(&cifsInfo->inUse) == 0) {
 602                 inode->i_uid = cifs_sb->mnt_uid;
 603                 inode->i_gid = cifs_sb->mnt_gid;
 604                 /* set so we do not keep refreshing these fields with
 605                    bad data after user has changed them in memory */
 606                 atomic_set(&cifsInfo->inUse, 1);
 607         }
 608
 609         cifs_set_ops(inode, is_dfs_referral);
 610
 611
 612
 613
 614 cgii_exit:
 615         kfree(buf);
 616         return rc;
 617 }
 618
 619 static const struct inode_operations cifs_ipc_inode_ops = {
 620         .lookup = cifs_lookup,
 621 };
 622
 623 /* gets root inode */
 624 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
 625 {
 626         int xid;
 627         struct cifs_sb_info *cifs_sb;
 628         struct inode *inode;
 629         long rc;
 630
 631         inode = iget_locked(sb, ino);
 632         if (!inode)
 633                 return ERR_PTR(-ENOMEM);
 634         if (!(inode->i_state & I_NEW))
 635                 return inode;
 636
 637         cifs_sb = CIFS_SB(inode->i_sb);
 638         xid = GetXid();
 639
 640         if (cifs_sb->tcon->unix_ext)
 641                 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
 642         else
 643                 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
 644                                          NULL);
 645         if (rc && cifs_sb->tcon->ipc) {
 646                 cFYI(1, ("ipc connection - fake read inode"));
 647                 inode->i_mode |= S_IFDIR;
 648                 inode->i_nlink = 2;
 649                 inode->i_op = &cifs_ipc_inode_ops;
 650                 inode->i_fop = &simple_dir_operations;
 651                 inode->i_uid = cifs_sb->mnt_uid;
 652                 inode->i_gid = cifs_sb->mnt_gid;
 653         } else if (rc) {
 654                 _FreeXid(xid);
 655                 iget_failed(inode);
 656                 return ERR_PTR(rc);
 657         }
 658
 659         unlock_new_inode(inode);
 660
 661         /* can not call macro FreeXid here since in a void func
 662          * TODO: This is no longer true
 663          */
 664         _FreeXid(xid);
 665         return inode;
 666 }
 667
 668 static int
 669 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
 670                     char *full_path, __u32 dosattr)
 671 {
 672         int rc;
 673         int oplock = 0;
 674         __u16 netfid;
 675         __u32 netpid;
 676         bool set_time = false;
 677         struct cifsFileInfo *open_file;
 678         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 679         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 680         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 681         FILE_BASIC_INFO info_buf;
 682
 683         if (attrs->ia_valid & ATTR_ATIME) {
 684                 set_time = true;
 685                 info_buf.LastAccessTime =
 686                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
 687         } else
 688                 info_buf.LastAccessTime = 0;
 689
 690         if (attrs->ia_valid & ATTR_MTIME) {
 691                 set_time = true;
 692                 info_buf.LastWriteTime =
 693                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
 694         } else
 695                 info_buf.LastWriteTime = 0;
 696
 697         /*
 698          * Samba throws this field away, but windows may actually use it.
 699          * Do not set ctime unless other time stamps are changed explicitly
 700          * (i.e. by utimes()) since we would then have a mix of client and
 701          * server times.
 702          */
 703         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
 704                 cFYI(1, ("CIFS - CTIME changed"));
 705                 info_buf.ChangeTime =
 706                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
 707         } else
 708                 info_buf.ChangeTime = 0;
 709
 710         info_buf.CreationTime = 0;      /* don't change */
 711         info_buf.Attributes = cpu_to_le32(dosattr);
 712
 713         /*
 714          * If the file is already open for write, just use that fileid
 715          */
 716         open_file = find_writable_file(cifsInode);
 717         if (open_file) {
 718                 netfid = open_file->netfid;
 719                 netpid = open_file->pid;
 720                 goto set_via_filehandle;
 721         }
 722
 723         /*
 724          * NT4 apparently returns success on this call, but it doesn't
 725          * really work.
 726          */
 727         if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
 728                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
 729                                      &info_buf, cifs_sb->local_nls,
 730                                      cifs_sb->mnt_cifs_flags &
 731                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 732                 if (rc != -EOPNOTSUPP && rc != -EINVAL)
 733                         goto out;
 734         }
 735
 736         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
 737                  "times not supported by this server"));
 738         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
 739                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
 740                          CREATE_NOT_DIR, &netfid, &oplock,
 741                          NULL, cifs_sb->local_nls,
 742                          cifs_sb->mnt_cifs_flags &
 743                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 744
 745         if (rc != 0) {
 746                 if (rc == -EIO)
 747                         rc = -EINVAL;
 748                 goto out;
 749         }
 750
 751         netpid = current->tgid;
 752
 753 set_via_filehandle:
 754         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
 755         if (open_file == NULL)
 756                 CIFSSMBClose(xid, pTcon, netfid);
 757         else
 758                 atomic_dec(&open_file->wrtPending);
 759 out:
 760         return rc;
 761 }
 762
 763 /*
 764  * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 765  * and rename it to a random name that hopefully won't conflict with
 766  * anything else.
 767  */
 768 static int
 769 cifs_rename_pending_delete(char *full_path, struct inode *inode, int xid)
 770 {
 771         int oplock = 0;
 772         int rc;
 773         __u16 netfid;
 774         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 775         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 776         struct cifsTconInfo *tcon = cifs_sb->tcon;
 777         __u32 dosattr;
 778         FILE_BASIC_INFO *info_buf;
 779
 780         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 781                          DELETE|FILE_WRITE_ATTRIBUTES,
 782                          CREATE_NOT_DIR|CREATE_DELETE_ON_CLOSE,
 783                          &netfid, &oplock, NULL, cifs_sb->local_nls,
 784                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 785         if (rc != 0)
 786                 goto out;
 787
 788         /* set ATTR_HIDDEN and clear ATTR_READONLY */
 789         cifsInode = CIFS_I(inode);
 790         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
 791         if (dosattr == 0)
 792                 dosattr |= ATTR_NORMAL;
 793         dosattr |= ATTR_HIDDEN;
 794
 795         info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
 796         if (info_buf == NULL) {
 797                 rc = -ENOMEM;
 798                 goto out_close;
 799         }
 800         info_buf->Attributes = cpu_to_le32(dosattr);
 801         rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid, current->tgid);
 802         kfree(info_buf);
 803         if (rc != 0)
 804                 goto out_close;
 805
 806         /* silly-rename the file */
 807         CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
 808                                    cifs_sb->mnt_cifs_flags &
 809                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 810
 811         /* set DELETE_ON_CLOSE */
 812         rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid, current->tgid);
 813
 814         /*
 815          * some samba versions return -ENOENT when we try to set the file
 816          * disposition here. Likely a samba bug, but work around it for now
 817          */
 818         if (rc == -ENOENT)
 819                 rc = 0;
 820
 821 out_close:
 822         CIFSSMBClose(xid, tcon, netfid);
 823 out:
 824         return rc;
 825 }
 826
 827 int cifs_unlink(struct inode *dir, struct dentry *dentry)
 828 {
 829         int rc = 0;
 830         int xid;
 831         char *full_path = NULL;
 832         struct inode *inode = dentry->d_inode;
 833         struct cifsInodeInfo *cifsInode;
 834         struct super_block *sb = dir->i_sb;
 835         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 836         struct cifsTconInfo *tcon = cifs_sb->tcon;
 837         struct iattr *attrs;
 838         __u32 dosattr;
 839
 840         cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
 841
 842         xid = GetXid();
 843
 844         /* Unlink can be called from rename so we can not take the
 845          * sb->s_vfs_rename_mutex here */
 846         full_path = build_path_from_dentry(dentry);
 847         if (full_path == NULL) {
 848                 FreeXid(xid);
 849                 return -ENOMEM;
 850         }
 851
 852         if ((tcon->ses->capabilities & CAP_UNIX) &&
 853                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 854                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 855                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
 856                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 857                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 858                 cFYI(1, ("posix del rc %d", rc));
 859                 if ((rc == 0) || (rc == -ENOENT))
 860                         goto psx_del_no_retry;
 861         }
 862
 863         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 864                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 865 psx_del_no_retry:
 866         if (!rc) {
 867                 if (inode)
 868                         drop_nlink(inode);
 869         } else if (rc == -ENOENT) {
 870                 d_drop(dentry);
 871         } else if (rc == -ETXTBSY) {
 872                 rc = cifs_rename_pending_delete(full_path, inode, xid);
 873                 if (rc == 0)
 874                         drop_nlink(inode);
 875         } else if (rc == -EACCES) {
 876                 /* try only if r/o attribute set in local lookup data? */
 877                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
 878                 if (attrs == NULL) {
 879                         rc = -ENOMEM;
 880                         goto out_reval;
 881                 }
 882
 883                 /* try to reset dos attributes */
 884                 cifsInode = CIFS_I(inode);
 885                 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
 886                 if (dosattr == 0)
 887                         dosattr |= ATTR_NORMAL;
 888                 dosattr |= ATTR_HIDDEN;
 889
 890                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
 891                 kfree(attrs);
 892                 if (rc != 0)
 893                         goto out_reval;
 894                 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 895                                     cifs_sb->mnt_cifs_flags &
 896                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 897                 if (rc == 0) {
 898                         if (inode)
 899                                 drop_nlink(inode);
 900                 } else if (rc == -ETXTBSY) {
 901                         rc = cifs_rename_pending_delete(full_path, inode, xid);
 902                         if (rc == 0)
 903                                 drop_nlink(inode);
 904                 }
 905         }
 906 out_reval:
 907         if (inode) {
 908                 cifsInode = CIFS_I(inode);
 909                 cifsInode->time = 0;    /* will force revalidate to get info
 910                                            when needed */
 911                 inode->i_ctime = current_fs_time(sb);
 912         }
 913         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
 914         cifsInode = CIFS_I(dir);
 915         cifsInode->time = 0;    /* force revalidate of dir as well */
 916
 917         kfree(full_path);
 918         FreeXid(xid);
 919         return rc;
 920 }
 921
 922 static void posix_fill_in_inode(struct inode *tmp_inode,
 923         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 924 {
 925         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 926         loff_t local_size;
 927         struct timespec local_mtime;
 928
 929         cifsInfo->time = jiffies;
 930         atomic_inc(&cifsInfo->inUse);
 931
 932         /* save mtime and size */
 933         local_mtime = tmp_inode->i_mtime;
 934         local_size  = tmp_inode->i_size;
 935
 936         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 937         cifs_set_ops(tmp_inode, false);
 938
 939         if (!S_ISREG(tmp_inode->i_mode))
 940                 return;
 941
 942         /*
 943          * No sense invalidating pages for new inode
 944          * since we we have not started caching
 945          * readahead file data yet.
 946          */
 947         if (isNewInode)
 948                 return;
 949
 950         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 951                 (local_size == tmp_inode->i_size)) {
 952                 cFYI(1, ("inode exists but unchanged"));
 953         } else {
 954                 /* file may have changed on server */
 955                 cFYI(1, ("invalidate inode, readdir detected change"));
 956                 invalidate_remote_inode(tmp_inode);
 957         }
 958 }
 959
 960 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 961 {
 962         int rc = 0;
 963         int xid;
 964         struct cifs_sb_info *cifs_sb;
 965         struct cifsTconInfo *pTcon;
 966         char *full_path = NULL;
 967         struct inode *newinode = NULL;
 968
 969         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 970
 971         xid = GetXid();
 972
 973         cifs_sb = CIFS_SB(inode->i_sb);
 974         pTcon = cifs_sb->tcon;
 975
 976         full_path = build_path_from_dentry(direntry);
 977         if (full_path == NULL) {
 978                 FreeXid(xid);
 979                 return -ENOMEM;
 980         }
 981
 982         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 983                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 984                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 985                 u32 oplock = 0;
 986                 FILE_UNIX_BASIC_INFO *pInfo =
 987                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 988                 if (pInfo == NULL) {
 989                         rc = -ENOMEM;
 990                         goto mkdir_out;
 991                 }
 992
 993                 mode &= ~current->fs->umask;
 994                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
 995                                 mode, NULL /* netfid */, pInfo, &oplock,
 996                                 full_path, cifs_sb->local_nls,
 997                                 cifs_sb->mnt_cifs_flags &
 998                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 999                 if (rc == -EOPNOTSUPP) {
1000                         kfree(pInfo);
1001                         goto mkdir_retry_old;
1002                 } else if (rc) {
1003                         cFYI(1, ("posix mkdir returned 0x%x", rc));
1004                         d_drop(direntry);
1005                 } else {
1006                         if (pInfo->Type == cpu_to_le32(-1)) {
1007                                 /* no return info, go query for it */
1008                                 kfree(pInfo);
1009                                 goto mkdir_get_info;
1010                         }
1011 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1012         to set uid/gid */
1013                         inc_nlink(inode);
1014                         if (pTcon->nocase)
1015                                 direntry->d_op = &cifs_ci_dentry_ops;
1016                         else
1017                                 direntry->d_op = &cifs_dentry_ops;
1018
1019                         newinode = new_inode(inode->i_sb);
1020                         if (newinode == NULL) {
1021                                 kfree(pInfo);
1022                                 goto mkdir_get_info;
1023                         }
1024                         /* Is an i_ino of zero legal? */
1025                         /* Are there sanity checks we can use to ensure that
1026                            the server is really filling in that field? */
1027                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1028                                 newinode->i_ino =
1029                                         (unsigned long)pInfo->UniqueId;
1030                         } /* note ino incremented to unique num in new_inode */
1031                         if (inode->i_sb->s_flags & MS_NOATIME)
1032                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
1033                         newinode->i_nlink = 2;
1034
1035                         insert_inode_hash(newinode);
1036                         d_instantiate(direntry, newinode);
1037
1038                         /* we already checked in POSIXCreate whether
1039                            frame was long enough */
1040                         posix_fill_in_inode(direntry->d_inode,
1041                                         pInfo, 1 /* NewInode */);
1042 #ifdef CONFIG_CIFS_DEBUG2
1043                         cFYI(1, ("instantiated dentry %p %s to inode %p",
1044                                 direntry, direntry->d_name.name, newinode));
1045
1046                         if (newinode->i_nlink != 2)
1047                                 cFYI(1, ("unexpected number of links %d",
1048                                         newinode->i_nlink));
1049 #endif
1050                 }
1051                 kfree(pInfo);
1052                 goto mkdir_out;
1053         }
1054 mkdir_retry_old:
1055         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1056         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1057                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1058         if (rc) {
1059                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1060                 d_drop(direntry);
1061         } else {
1062 mkdir_get_info:
1063                 inc_nlink(inode);
1064                 if (pTcon->unix_ext)
1065                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1066                                                       inode->i_sb, xid);
1067                 else
1068                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1069                                                  inode->i_sb, xid, NULL);
1070
1071                 if (pTcon->nocase)
1072                         direntry->d_op = &cifs_ci_dentry_ops;
1073                 else
1074                         direntry->d_op = &cifs_dentry_ops;
1075                 d_instantiate(direntry, newinode);
1076                  /* setting nlink not necessary except in cases where we
1077                   * failed to get it from the server or was set bogus */
1078                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1079                                 direntry->d_inode->i_nlink = 2;
1080
1081                 mode &= ~current->fs->umask;
1082                 /* must turn on setgid bit if parent dir has it */
1083                 if (inode->i_mode & S_ISGID)
1084                         mode |= S_ISGID;
1085
1086                 if (pTcon->unix_ext) {
1087                         struct cifs_unix_set_info_args args = {
1088                                 .mode   = mode,
1089                                 .ctime  = NO_CHANGE_64,
1090                                 .atime  = NO_CHANGE_64,
1091                                 .mtime  = NO_CHANGE_64,
1092                                 .device = 0,
1093                         };
1094                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1095                                 args.uid = (__u64)current->fsuid;
1096                                 if (inode->i_mode & S_ISGID)
1097                                         args.gid = (__u64)inode->i_gid;
1098                                 else
1099                                         args.gid = (__u64)current->fsgid;
1100                         } else {
1101                                 args.uid = NO_CHANGE_64;
1102                                 args.gid = NO_CHANGE_64;
1103                         }
1104                         CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1105                                             cifs_sb->local_nls,
1106                                             cifs_sb->mnt_cifs_flags &
1107                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1108                 } else {
1109                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1110                             (mode & S_IWUGO) == 0) {
1111                                 FILE_BASIC_INFO pInfo;
1112                                 memset(&pInfo, 0, sizeof(pInfo));
1113                                 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
1114                                 CIFSSMBSetPathInfo(xid, pTcon, full_path,
1115                                                 &pInfo, cifs_sb->local_nls,
1116                                                 cifs_sb->mnt_cifs_flags &
1117                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1118                         }
1119                         if (direntry->d_inode) {
1120                                 if (cifs_sb->mnt_cifs_flags &
1121                                      CIFS_MOUNT_DYNPERM)
1122                                         direntry->d_inode->i_mode =
1123                                                 (mode | S_IFDIR);
1124
1125                                 if (cifs_sb->mnt_cifs_flags &
1126                                      CIFS_MOUNT_SET_UID) {
1127                                         direntry->d_inode->i_uid =
1128                                                 current->fsuid;
1129                                         if (inode->i_mode & S_ISGID)
1130                                                 direntry->d_inode->i_gid =
1131                                                         inode->i_gid;
1132                                         else
1133                                                 direntry->d_inode->i_gid =
1134                                                         current->fsgid;
1135                                 }
1136                         }
1137                 }
1138         }
1139 mkdir_out:
1140         kfree(full_path);
1141         FreeXid(xid);
1142         return rc;
1143 }
1144
1145 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1146 {
1147         int rc = 0;
1148         int xid;
1149         struct cifs_sb_info *cifs_sb;
1150         struct cifsTconInfo *pTcon;
1151         char *full_path = NULL;
1152         struct cifsInodeInfo *cifsInode;
1153
1154         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1155
1156         xid = GetXid();
1157
1158         cifs_sb = CIFS_SB(inode->i_sb);
1159         pTcon = cifs_sb->tcon;
1160
1161         full_path = build_path_from_dentry(direntry);
1162         if (full_path == NULL) {
1163                 FreeXid(xid);
1164                 return -ENOMEM;
1165         }
1166
1167         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1168                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1169
1170         if (!rc) {
1171                 drop_nlink(inode);
1172                 spin_lock(&direntry->d_inode->i_lock);
1173                 i_size_write(direntry->d_inode, 0);
1174                 clear_nlink(direntry->d_inode);
1175                 spin_unlock(&direntry->d_inode->i_lock);
1176         }
1177
1178         cifsInode = CIFS_I(direntry->d_inode);
1179         cifsInode->time = 0;    /* force revalidate to go get info when
1180                                    needed */
1181         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1182                 current_fs_time(inode->i_sb);
1183
1184         kfree(full_path);
1185         FreeXid(xid);
1186         return rc;
1187 }
1188
1189 static int
1190 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1191                 struct dentry *to_dentry, const char *toPath)
1192 {
1193         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1194         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1195         __u16 srcfid;
1196         int oplock, rc;
1197
1198         /* try path-based rename first */
1199         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1200                            cifs_sb->mnt_cifs_flags &
1201                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1202
1203         /*
1204          * don't bother with rename by filehandle unless file is busy and
1205          * source Note that cross directory moves do not work with
1206          * rename by filehandle to various Windows servers.
1207          */
1208         if (rc == 0 || rc != -ETXTBSY)
1209                 return rc;
1210
1211         /* open the file to be renamed -- we need DELETE perms */
1212         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1213                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1214                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1215                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1216
1217         if (rc == 0) {
1218                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1219                                 (const char *) to_dentry->d_name.name,
1220                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1221                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1222
1223                 CIFSSMBClose(xid, pTcon, srcfid);
1224         }
1225
1226         return rc;
1227 }
1228
1229 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1230         struct inode *target_inode, struct dentry *target_direntry)
1231 {
1232         char *fromName = NULL;
1233         char *toName = NULL;
1234         struct cifs_sb_info *cifs_sb_source;
1235         struct cifs_sb_info *cifs_sb_target;
1236         struct cifsTconInfo *pTcon;
1237         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1238         FILE_UNIX_BASIC_INFO *info_buf_target;
1239         int xid;
1240         int rc;
1241
1242         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1243         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1244         pTcon = cifs_sb_source->tcon;
1245
1246         xid = GetXid();
1247
1248         /*
1249          * BB: this might be allowed if same server, but different share.
1250          * Consider adding support for this
1251          */
1252         if (pTcon != cifs_sb_target->tcon) {
1253                 rc = -EXDEV;
1254                 goto cifs_rename_exit;
1255         }
1256
1257         /*
1258          * we already have the rename sem so we do not need to
1259          * grab it again here to protect the path integrity
1260          */
1261         fromName = build_path_from_dentry(source_direntry);
1262         if (fromName == NULL) {
1263                 rc = -ENOMEM;
1264                 goto cifs_rename_exit;
1265         }
1266
1267         toName = build_path_from_dentry(target_direntry);
1268         if (toName == NULL) {
1269                 rc = -ENOMEM;
1270                 goto cifs_rename_exit;
1271         }
1272
1273         rc = cifs_do_rename(xid, source_direntry, fromName,
1274                             target_direntry, toName);
1275
1276         if (rc == -EEXIST) {
1277                 if (pTcon->unix_ext) {
1278                         /*
1279                          * Are src and dst hardlinks of same inode? We can
1280                          * only tell with unix extensions enabled
1281                          */
1282                         info_buf_source =
1283                                 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1284                                                 GFP_KERNEL);
1285                         if (info_buf_source == NULL)
1286                                 goto unlink_target;
1287
1288                         info_buf_target = info_buf_source + 1;
1289                         rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1290                                                 info_buf_source,
1291                                                 cifs_sb_source->local_nls,
1292                                                 cifs_sb_source->mnt_cifs_flags &
1293                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1294                         if (rc != 0)
1295                                 goto unlink_target;
1296
1297                         rc = CIFSSMBUnixQPathInfo(xid, pTcon,
1298                                                 toName, info_buf_target,
1299                                                 cifs_sb_target->local_nls,
1300                                                 /* remap based on source sb */
1301                                                 cifs_sb_source->mnt_cifs_flags &
1302                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1303
1304                         if (rc == 0 && (info_buf_source->UniqueId ==
1305                                         info_buf_target->UniqueId))
1306                                 /* same file, POSIX says that this is a noop */
1307                                 goto cifs_rename_exit;
1308                 } /* else ... BB we could add the same check for Windows by
1309                      checking the UniqueId via FILE_INTERNAL_INFO */
1310 unlink_target:
1311                 /*
1312                  * we either can not tell the files are hardlinked (as with
1313                  * Windows servers) or files are not hardlinked. Delete the
1314                  * target manually before renaming to follow POSIX rather than
1315                  * Windows semantics
1316                  */
1317                 cifs_unlink(target_inode, target_direntry);
1318                 rc = cifs_do_rename(xid, source_direntry, fromName,
1319                                     target_direntry, toName);
1320         }
1321
1322 cifs_rename_exit:
1323         kfree(info_buf_source);
1324         kfree(fromName);
1325         kfree(toName);
1326         FreeXid(xid);
1327         return rc;
1328 }
1329
1330 int cifs_revalidate(struct dentry *direntry)
1331 {
1332         int xid;
1333         int rc = 0, wbrc = 0;
1334         char *full_path;
1335         struct cifs_sb_info *cifs_sb;
1336         struct cifsInodeInfo *cifsInode;
1337         loff_t local_size;
1338         struct timespec local_mtime;
1339         bool invalidate_inode = false;
1340
1341         if (direntry->d_inode == NULL)
1342                 return -ENOENT;
1343
1344         cifsInode = CIFS_I(direntry->d_inode);
1345
1346         if (cifsInode == NULL)
1347                 return -ENOENT;
1348
1349         /* no sense revalidating inode info on file that no one can write */
1350         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1351                 return rc;
1352
1353         xid = GetXid();
1354
1355         cifs_sb = CIFS_SB(direntry->d_sb);
1356
1357         /* can not safely grab the rename sem here if rename calls revalidate
1358            since that would deadlock */
1359         full_path = build_path_from_dentry(direntry);
1360         if (full_path == NULL) {
1361                 FreeXid(xid);
1362                 return -ENOMEM;
1363         }
1364         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1365                  "jiffies %ld", full_path, direntry->d_inode,
1366                  direntry->d_inode->i_count.counter, direntry,
1367                  direntry->d_time, jiffies));
1368
1369         if (cifsInode->time == 0) {
1370                 /* was set to zero previously to force revalidate */
1371         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1372                    lookupCacheEnabled) {
1373                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1374                     (direntry->d_inode->i_nlink == 1)) {
1375                         kfree(full_path);
1376                         FreeXid(xid);
1377                         return rc;
1378                 } else {
1379                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1380                 }
1381         }
1382
1383         /* save mtime and size */
1384         local_mtime = direntry->d_inode->i_mtime;
1385         local_size = direntry->d_inode->i_size;
1386
1387         if (cifs_sb->tcon->unix_ext) {
1388                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1389                                               direntry->d_sb, xid);
1390                 if (rc) {
1391                         cFYI(1, ("error on getting revalidate info %d", rc));
1392 /*                      if (rc != -ENOENT)
1393                                 rc = 0; */      /* BB should we cache info on
1394                                                    certain errors? */
1395                 }
1396         } else {
1397                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1398                                          direntry->d_sb, xid, NULL);
1399                 if (rc) {
1400                         cFYI(1, ("error on getting revalidate info %d", rc));
1401 /*                      if (rc != -ENOENT)
1402                                 rc = 0; */      /* BB should we cache info on
1403                                                    certain errors? */
1404                 }
1405         }
1406         /* should we remap certain errors, access denied?, to zero */
1407
1408         /* if not oplocked, we invalidate inode pages if mtime or file size
1409            had changed on server */
1410
1411         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1412             (local_size == direntry->d_inode->i_size)) {
1413                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1414         } else {
1415                 /* file may have changed on server */
1416                 if (cifsInode->clientCanCacheRead) {
1417                         /* no need to invalidate inode pages since we were the
1418                            only ones who could have modified the file and the
1419                            server copy is staler than ours */
1420                 } else {
1421                         invalidate_inode = true;
1422                 }
1423         }
1424
1425         /* can not grab this sem since kernel filesys locking documentation
1426            indicates i_mutex may be taken by the kernel on lookup and rename
1427            which could deadlock if we grab the i_mutex here as well */
1428 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1429         /* need to write out dirty pages here  */
1430         if (direntry->d_inode->i_mapping) {
1431                 /* do we need to lock inode until after invalidate completes
1432                    below? */
1433                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1434                 if (wbrc)
1435                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1436         }
1437         if (invalidate_inode) {
1438         /* shrink_dcache not necessary now that cifs dentry ops
1439         are exported for negative dentries */
1440 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1441                         shrink_dcache_parent(direntry); */
1442                 if (S_ISREG(direntry->d_inode->i_mode)) {
1443                         if (direntry->d_inode->i_mapping) {
1444                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1445                                 if (wbrc)
1446                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1447                         }
1448                         /* may eventually have to do this for open files too */
1449                         if (list_empty(&(cifsInode->openFileList))) {
1450                                 /* changed on server - flush read ahead pages */
1451                                 cFYI(1, ("Invalidating read ahead data on "
1452                                          "closed file"));
1453                                 invalidate_remote_inode(direntry->d_inode);
1454                         }
1455                 }
1456         }
1457 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1458
1459         kfree(full_path);
1460         FreeXid(xid);
1461         return rc;
1462 }
1463
1464 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1465         struct kstat *stat)
1466 {
1467         int err = cifs_revalidate(dentry);
1468         if (!err) {
1469                 generic_fillattr(dentry->d_inode, stat);
1470                 stat->blksize = CIFS_MAX_MSGSIZE;
1471         }
1472         return err;
1473 }
1474
1475 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1476 {
1477         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1478         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1479         struct page *page;
1480         int rc = 0;
1481
1482         page = grab_cache_page(mapping, index);
1483         if (!page)
1484                 return -ENOMEM;
1485
1486         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1487         unlock_page(page);
1488         page_cache_release(page);
1489         return rc;
1490 }
1491
1492 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1493 {
1494         struct address_space *mapping = inode->i_mapping;
1495         unsigned long limit;
1496
1497         spin_lock(&inode->i_lock);
1498         if (inode->i_size < offset)
1499                 goto do_expand;
1500         /*
1501          * truncation of in-use swapfiles is disallowed - it would cause
1502          * subsequent swapout to scribble on the now-freed blocks.
1503          */
1504         if (IS_SWAPFILE(inode)) {
1505                 spin_unlock(&inode->i_lock);
1506                 goto out_busy;
1507         }
1508         i_size_write(inode, offset);
1509         spin_unlock(&inode->i_lock);
1510         /*
1511          * unmap_mapping_range is called twice, first simply for efficiency
1512          * so that truncate_inode_pages does fewer single-page unmaps. However
1513          * after this first call, and before truncate_inode_pages finishes,
1514          * it is possible for private pages to be COWed, which remain after
1515          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1516          * call must be made for correctness.
1517          */
1518         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1519         truncate_inode_pages(mapping, offset);
1520         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1521         goto out_truncate;
1522
1523 do_expand:
1524         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1525         if (limit != RLIM_INFINITY && offset > limit) {
1526                 spin_unlock(&inode->i_lock);
1527                 goto out_sig;
1528         }
1529         if (offset > inode->i_sb->s_maxbytes) {
1530                 spin_unlock(&inode->i_lock);
1531                 goto out_big;
1532         }
1533         i_size_write(inode, offset);
1534         spin_unlock(&inode->i_lock);
1535 out_truncate:
1536         if (inode->i_op && inode->i_op->truncate)
1537                 inode->i_op->truncate(inode);
1538         return 0;
1539 out_sig:
1540         send_sig(SIGXFSZ, current, 0);
1541 out_big:
1542         return -EFBIG;
1543 out_busy:
1544         return -ETXTBSY;
1545 }
1546
1547 static int
1548 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1549                    int xid, char *full_path)
1550 {
1551         int rc;
1552         struct cifsFileInfo *open_file;
1553         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1554         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1555         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1556
1557         /*
1558          * To avoid spurious oplock breaks from server, in the case of
1559          * inodes that we already have open, avoid doing path based
1560          * setting of file size if we can do it by handle.
1561          * This keeps our caching token (oplock) and avoids timeouts
1562          * when the local oplock break takes longer to flush
1563          * writebehind data than the SMB timeout for the SetPathInfo
1564          * request would allow
1565          */
1566         open_file = find_writable_file(cifsInode);
1567         if (open_file) {
1568                 __u16 nfid = open_file->netfid;
1569                 __u32 npid = open_file->pid;
1570                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1571                                         npid, false);
1572                 atomic_dec(&open_file->wrtPending);
1573                 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1574                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1575                         unsigned int bytes_written;
1576                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1577                                           &bytes_written, NULL, NULL, 1);
1578                         cFYI(1, ("Wrt seteof rc %d", rc));
1579                 }
1580         } else
1581                 rc = -EINVAL;
1582
1583         if (rc != 0) {
1584                 /* Set file size by pathname rather than by handle
1585                    either because no valid, writeable file handle for
1586                    it was found or because there was an error setting
1587                    it by handle */
1588                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1589                                    false, cifs_sb->local_nls,
1590                                    cifs_sb->mnt_cifs_flags &
1591                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1592                 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1593                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1594                         __u16 netfid;
1595                         int oplock = 0;
1596
1597                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1598                                 FILE_OPEN, GENERIC_WRITE,
1599                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1600                                 cifs_sb->local_nls,
1601                                 cifs_sb->mnt_cifs_flags &
1602                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1603                         if (rc == 0) {
1604                                 unsigned int bytes_written;
1605                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1606                                                   attrs->ia_size,
1607                                                   &bytes_written, NULL,
1608                                                   NULL, 1);
1609                                 cFYI(1, ("wrt seteof rc %d", rc));
1610                                 CIFSSMBClose(xid, pTcon, netfid);
1611                         }
1612                 }
1613         }
1614
1615         if (rc == 0) {
1616                 rc = cifs_vmtruncate(inode, attrs->ia_size);
1617                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1618         }
1619
1620         return rc;
1621 }
1622
1623 static int
1624 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1625 {
1626         int rc;
1627         int xid;
1628         char *full_path = NULL;
1629         struct inode *inode = direntry->d_inode;
1630         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1631         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1632         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1633         struct cifs_unix_set_info_args *args = NULL;
1634
1635         cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1636                  direntry->d_name.name, attrs->ia_valid));
1637
1638         xid = GetXid();
1639
1640         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1641                 /* check if we have permission to change attrs */
1642                 rc = inode_change_ok(inode, attrs);
1643                 if (rc < 0)
1644                         goto out;
1645                 else
1646                         rc = 0;
1647         }
1648
1649         full_path = build_path_from_dentry(direntry);
1650         if (full_path == NULL) {
1651                 rc = -ENOMEM;
1652                 goto out;
1653         }
1654
1655         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1656                 /*
1657                    Flush data before changing file size or changing the last
1658                    write time of the file on the server. If the
1659                    flush returns error, store it to report later and continue.
1660                    BB: This should be smarter. Why bother flushing pages that
1661                    will be truncated anyway? Also, should we error out here if
1662                    the flush returns error?
1663                  */
1664                 rc = filemap_write_and_wait(inode->i_mapping);
1665                 if (rc != 0) {
1666                         cifsInode->write_behind_rc = rc;
1667                         rc = 0;
1668                 }
1669         }
1670
1671         if (attrs->ia_valid & ATTR_SIZE) {
1672                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1673                 if (rc != 0)
1674                         goto out;
1675         }
1676
1677         /* skip mode change if it's just for clearing setuid/setgid */
1678         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1679                 attrs->ia_valid &= ~ATTR_MODE;
1680
1681         args = kmalloc(sizeof(*args), GFP_KERNEL);
1682         if (args == NULL) {
1683                 rc = -ENOMEM;
1684                 goto out;
1685         }
1686
1687         /* set up the struct */
1688         if (attrs->ia_valid & ATTR_MODE)
1689                 args->mode = attrs->ia_mode;
1690         else
1691                 args->mode = NO_CHANGE_64;
1692
1693         if (attrs->ia_valid & ATTR_UID)
1694                 args->uid = attrs->ia_uid;
1695         else
1696                 args->uid = NO_CHANGE_64;
1697
1698         if (attrs->ia_valid & ATTR_GID)
1699                 args->gid = attrs->ia_gid;
1700         else
1701                 args->gid = NO_CHANGE_64;
1702
1703         if (attrs->ia_valid & ATTR_ATIME)
1704                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1705         else
1706                 args->atime = NO_CHANGE_64;
1707
1708         if (attrs->ia_valid & ATTR_MTIME)
1709                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1710         else
1711                 args->mtime = NO_CHANGE_64;
1712
1713         if (attrs->ia_valid & ATTR_CTIME)
1714                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1715         else
1716                 args->ctime = NO_CHANGE_64;
1717
1718         args->device = 0;
1719         rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1720                                 cifs_sb->local_nls,
1721                                 cifs_sb->mnt_cifs_flags &
1722                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1723
1724         if (!rc)
1725                 rc = inode_setattr(inode, attrs);
1726 out:
1727         kfree(args);
1728         kfree(full_path);
1729         FreeXid(xid);
1730         return rc;
1731 }
1732
1733 static int
1734 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1735 {
1736         int xid;
1737         struct inode *inode = direntry->d_inode;
1738         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1739         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1740         char *full_path = NULL;
1741         int rc = -EACCES;
1742         __u32 dosattr = 0;
1743         __u64 mode = NO_CHANGE_64;
1744
1745         xid = GetXid();
1746
1747         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1748                  direntry->d_name.name, attrs->ia_valid));
1749
1750         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1751                 /* check if we have permission to change attrs */
1752                 rc = inode_change_ok(inode, attrs);
1753                 if (rc < 0) {
1754                         FreeXid(xid);
1755                         return rc;
1756                 } else
1757                         rc = 0;
1758         }
1759
1760         full_path = build_path_from_dentry(direntry);
1761         if (full_path == NULL) {
1762                 FreeXid(xid);
1763                 return -ENOMEM;
1764         }
1765
1766         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1767                 /*
1768                    Flush data before changing file size or changing the last
1769                    write time of the file on the server. If the
1770                    flush returns error, store it to report later and continue.
1771                    BB: This should be smarter. Why bother flushing pages that
1772                    will be truncated anyway? Also, should we error out here if
1773                    the flush returns error?
1774                  */
1775                 rc = filemap_write_and_wait(inode->i_mapping);
1776                 if (rc != 0) {
1777                         cifsInode->write_behind_rc = rc;
1778                         rc = 0;
1779                 }
1780         }
1781
1782         if (attrs->ia_valid & ATTR_SIZE) {
1783                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1784                 if (rc != 0)
1785                         goto cifs_setattr_exit;
1786         }
1787
1788         /*
1789          * Without unix extensions we can't send ownership changes to the
1790          * server, so silently ignore them. This is consistent with how
1791          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1792          * CIFSACL support + proper Windows to Unix idmapping, we may be
1793          * able to support this in the future.
1794          */
1795         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1796                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1797
1798         /* skip mode change if it's just for clearing setuid/setgid */
1799         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1800                 attrs->ia_valid &= ~ATTR_MODE;
1801
1802         if (attrs->ia_valid & ATTR_MODE) {
1803                 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1804                 mode = attrs->ia_mode;
1805         }
1806
1807         if (attrs->ia_valid & ATTR_MODE) {
1808                 rc = 0;
1809 #ifdef CONFIG_CIFS_EXPERIMENTAL
1810                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1811                         rc = mode_to_acl(inode, full_path, mode);
1812                 else
1813 #endif
1814                 if (((mode & S_IWUGO) == 0) &&
1815                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1816
1817                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1818
1819                         /* fix up mode if we're not using dynperm */
1820                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1821                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1822                 } else if ((mode & S_IWUGO) &&
1823                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
1824
1825                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1826                         /* Attributes of 0 are ignored */
1827                         if (dosattr == 0)
1828                                 dosattr |= ATTR_NORMAL;
1829
1830                         /* reset local inode permissions to normal */
1831                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1832                                 attrs->ia_mode &= ~(S_IALLUGO);
1833                                 if (S_ISDIR(inode->i_mode))
1834                                         attrs->ia_mode |=
1835                                                 cifs_sb->mnt_dir_mode;
1836                                 else
1837                                         attrs->ia_mode |=
1838                                                 cifs_sb->mnt_file_mode;
1839                         }
1840                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1841                         /* ignore mode change - ATTR_READONLY hasn't changed */
1842                         attrs->ia_valid &= ~ATTR_MODE;
1843                 }
1844         }
1845
1846         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1847             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1848                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1849                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1850
1851                 /* Even if error on time set, no sense failing the call if
1852                 the server would set the time to a reasonable value anyway,
1853                 and this check ensures that we are not being called from
1854                 sys_utimes in which case we ought to fail the call back to
1855                 the user when the server rejects the call */
1856                 if ((rc) && (attrs->ia_valid &
1857                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1858                         rc = 0;
1859         }
1860
1861         /* do not need local check to inode_check_ok since the server does
1862            that */
1863         if (!rc)
1864                 rc = inode_setattr(inode, attrs);
1865 cifs_setattr_exit:
1866         kfree(full_path);
1867         FreeXid(xid);
1868         return rc;
1869 }
1870
1871 int
1872 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1873 {
1874         struct inode *inode = direntry->d_inode;
1875         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1876         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1877
1878         if (pTcon->unix_ext)
1879                 return cifs_setattr_unix(direntry, attrs);
1880
1881         return cifs_setattr_nounix(direntry, attrs);
1882
1883         /* BB: add cifs_setattr_legacy for really old servers */
1884 }
1885
1886 #if 0
1887 void cifs_delete_inode(struct inode *inode)
1888 {
1889         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1890         /* may have to add back in if and when safe distributed caching of
1891            directories added e.g. via FindNotify */
1892 }
1893 #endif