fs/cifs/inode.c

   1 /*
   2  *   fs/cifs/inode.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2007
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21 #include <linux/fs.h>
  22 #include <linux/stat.h>
  23 #include <linux/pagemap.h>
  24 #include <asm/div64.h>
  25 #include "cifsfs.h"
  26 #include "cifspdu.h"
  27 #include "cifsglob.h"
  28 #include "cifsproto.h"
  29 #include "cifs_debug.h"
  30 #include "cifs_fs_sb.h"
  31
  32
  33 static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
  34 {
  35         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  36
  37         switch (inode->i_mode & S_IFMT) {
  38         case S_IFREG:
  39                 inode->i_op = &cifs_file_inode_ops;
  40                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
  41                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  42                                 inode->i_fop = &cifs_file_direct_nobrl_ops;
  43                         else
  44                                 inode->i_fop = &cifs_file_direct_ops;
  45                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  46                         inode->i_fop = &cifs_file_nobrl_ops;
  47                 else { /* not direct, send byte range locks */
  48                         inode->i_fop = &cifs_file_ops;
  49                 }
  50
  51
  52                 /* check if server can support readpages */
  53                 if (cifs_sb->tcon->ses->server->maxBuf <
  54                                 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
  55                         inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
  56                 else
  57                         inode->i_data.a_ops = &cifs_addr_ops;
  58                 break;
  59         case S_IFDIR:
  60 #ifdef CONFIG_CIFS_DFS_UPCALL
  61                 if (is_dfs_referral) {
  62                         inode->i_op = &cifs_dfs_referral_inode_operations;
  63                 } else {
  64 #else /* NO DFS support, treat as a directory */
  65                 {
  66 #endif
  67                         inode->i_op = &cifs_dir_inode_ops;
  68                         inode->i_fop = &cifs_dir_ops;
  69                 }
  70                 break;
  71         case S_IFLNK:
  72                 inode->i_op = &cifs_symlink_inode_ops;
  73                 break;
  74         default:
  75                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  76                 break;
  77         }
  78 }
  79
  80 static void cifs_unix_info_to_inode(struct inode *inode,
  81                 FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
  82 {
  83         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  84         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
  85         __u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
  86         __u64 end_of_file = le64_to_cpu(info->EndOfFile);
  87
  88         inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(info->LastAccessTime));
  89         inode->i_mtime =
  90                 cifs_NTtimeToUnix(le64_to_cpu(info->LastModificationTime));
  91         inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(info->LastStatusChange));
  92         inode->i_mode = le64_to_cpu(info->Permissions);
  93
  94         /*
  95          * Since we set the inode type below we need to mask off
  96          * to avoid strange results if bits set above.
  97          */
  98         inode->i_mode &= ~S_IFMT;
  99         switch (le32_to_cpu(info->Type)) {
 100         case UNIX_FILE:
 101                 inode->i_mode |= S_IFREG;
 102                 break;
 103         case UNIX_SYMLINK:
 104                 inode->i_mode |= S_IFLNK;
 105                 break;
 106         case UNIX_DIR:
 107                 inode->i_mode |= S_IFDIR;
 108                 break;
 109         case UNIX_CHARDEV:
 110                 inode->i_mode |= S_IFCHR;
 111                 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 112                                       le64_to_cpu(info->DevMinor) & MINORMASK);
 113                 break;
 114         case UNIX_BLOCKDEV:
 115                 inode->i_mode |= S_IFBLK;
 116                 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 117                                       le64_to_cpu(info->DevMinor) & MINORMASK);
 118                 break;
 119         case UNIX_FIFO:
 120                 inode->i_mode |= S_IFIFO;
 121                 break;
 122         case UNIX_SOCKET:
 123                 inode->i_mode |= S_IFSOCK;
 124                 break;
 125         default:
 126                 /* safest to call it a file if we do not know */
 127                 inode->i_mode |= S_IFREG;
 128                 cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
 129                 break;
 130         }
 131
 132         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
 133             !force_uid_gid)
 134                 inode->i_uid = cifs_sb->mnt_uid;
 135         else
 136                 inode->i_uid = le64_to_cpu(info->Uid);
 137
 138         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
 139             !force_uid_gid)
 140                 inode->i_gid = cifs_sb->mnt_gid;
 141         else
 142                 inode->i_gid = le64_to_cpu(info->Gid);
 143
 144         inode->i_nlink = le64_to_cpu(info->Nlinks);
 145
 146         spin_lock(&inode->i_lock);
 147         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 148                 /*
 149                  * We can not safely change the file size here if the client
 150                  * is writing to it due to potential races.
 151                  */
 152                 i_size_write(inode, end_of_file);
 153
 154                 /*
 155                  * i_blocks is not related to (i_size / i_blksize),
 156                  * but instead 512 byte (2**9) size is required for
 157                  * calculating num blocks.
 158                  */
 159                 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 160         }
 161         spin_unlock(&inode->i_lock);
 162 }
 163
 164
 165 /*
 166  *      Needed to setup inode data for the directory which is the
 167  *      junction to the new submount (ie to setup the fake directory
 168  *      which represents a DFS referral)
 169  */
 170 static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
 171                                struct super_block *sb)
 172 {
 173         struct inode *pinode = NULL;
 174
 175         memset(pfnd_dat, 0, sizeof(FILE_UNIX_BASIC_INFO));
 176
 177 /*      __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
 178         __le64 pfnd_dat->NumOfBytes = cpu_to_le64(0);
 179         __u64 UniqueId = 0;  */
 180         pfnd_dat->LastStatusChange =
 181                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 182         pfnd_dat->LastAccessTime =
 183                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 184         pfnd_dat->LastModificationTime =
 185                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 186         pfnd_dat->Type = cpu_to_le32(UNIX_DIR);
 187         pfnd_dat->Permissions = cpu_to_le64(S_IXUGO | S_IRWXU);
 188         pfnd_dat->Nlinks = cpu_to_le64(2);
 189         if (sb->s_root)
 190                 pinode = sb->s_root->d_inode;
 191         if (pinode == NULL)
 192                 return;
 193
 194         /* fill in default values for the remaining based on root
 195            inode since we can not query the server for this inode info */
 196         pfnd_dat->DevMajor = cpu_to_le64(MAJOR(pinode->i_rdev));
 197         pfnd_dat->DevMinor = cpu_to_le64(MINOR(pinode->i_rdev));
 198         pfnd_dat->Uid = cpu_to_le64(pinode->i_uid);
 199         pfnd_dat->Gid = cpu_to_le64(pinode->i_gid);
 200 }
 201
 202 int cifs_get_inode_info_unix(struct inode **pinode,
 203         const unsigned char *full_path, struct super_block *sb, int xid)
 204 {
 205         int rc = 0;
 206         FILE_UNIX_BASIC_INFO find_data;
 207         struct cifsTconInfo *pTcon;
 208         struct inode *inode;
 209         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 210         bool is_dfs_referral = false;
 211         struct cifsInodeInfo *cifsInfo;
 212         __u64 num_of_bytes;
 213         __u64 end_of_file;
 214
 215         pTcon = cifs_sb->tcon;
 216         cFYI(1, ("Getting info on %s", full_path));
 217
 218         /* could have done a find first instead but this returns more info */
 219         rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &find_data,
 220                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 221                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 222         if (rc == -EREMOTE && !is_dfs_referral) {
 223                 is_dfs_referral = true;
 224                 cFYI(DBG2, ("DFS ref"));
 225                 /* for DFS, server does not give us real inode data */
 226                 fill_fake_finddataunix(&find_data, sb);
 227                 rc = 0;
 228         } else if (rc)
 229                 goto cgiiu_exit;
 230
 231         num_of_bytes = le64_to_cpu(find_data.NumOfBytes);
 232         end_of_file = le64_to_cpu(find_data.EndOfFile);
 233
 234         /* get new inode */
 235         if (*pinode == NULL) {
 236                 *pinode = new_inode(sb);
 237                 if (*pinode == NULL) {
 238                         rc = -ENOMEM;
 239                         goto cgiiu_exit;
 240                 }
 241                 /* Is an i_ino of zero legal? */
 242                 /* note ino incremented to unique num in new_inode */
 243                 /* Are there sanity checks we can use to ensure that
 244                    the server is really filling in that field? */
 245                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 246                         (*pinode)->i_ino = (unsigned long)find_data.UniqueId;
 247
 248                 if (sb->s_flags & MS_NOATIME)
 249                         (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
 250
 251                 insert_inode_hash(*pinode);
 252         }
 253
 254         inode = *pinode;
 255         cifsInfo = CIFS_I(inode);
 256
 257         cFYI(1, ("Old time %ld", cifsInfo->time));
 258         cifsInfo->time = jiffies;
 259         cFYI(1, ("New time %ld", cifsInfo->time));
 260         /* this is ok to set on every inode revalidate */
 261         atomic_set(&cifsInfo->inUse, 1);
 262
 263         cifs_unix_info_to_inode(inode, &find_data, 0);
 264
 265         if (num_of_bytes < end_of_file)
 266                 cFYI(1, ("allocation size less than end of file"));
 267         cFYI(1, ("Size %ld and blocks %llu",
 268                 (unsigned long) inode->i_size,
 269                 (unsigned long long)inode->i_blocks));
 270
 271         cifs_set_ops(inode, is_dfs_referral);
 272 cgiiu_exit:
 273         return rc;
 274 }
 275
 276 static int decode_sfu_inode(struct inode *inode, __u64 size,
 277                             const unsigned char *path,
 278                             struct cifs_sb_info *cifs_sb, int xid)
 279 {
 280         int rc;
 281         int oplock = 0;
 282         __u16 netfid;
 283         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 284         char buf[24];
 285         unsigned int bytes_read;
 286         char *pbuf;
 287
 288         pbuf = buf;
 289
 290         if (size == 0) {
 291                 inode->i_mode |= S_IFIFO;
 292                 return 0;
 293         } else if (size < 8) {
 294                 return -EINVAL;  /* EOPNOTSUPP? */
 295         }
 296
 297         rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
 298                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 299                          cifs_sb->local_nls,
 300                          cifs_sb->mnt_cifs_flags &
 301                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 302         if (rc == 0) {
 303                 int buf_type = CIFS_NO_BUFFER;
 304                         /* Read header */
 305                 rc = CIFSSMBRead(xid, pTcon,
 306                                  netfid,
 307                                  24 /* length */, 0 /* offset */,
 308                                  &bytes_read, &pbuf, &buf_type);
 309                 if ((rc == 0) && (bytes_read >= 8)) {
 310                         if (memcmp("IntxBLK", pbuf, 8) == 0) {
 311                                 cFYI(1, ("Block device"));
 312                                 inode->i_mode |= S_IFBLK;
 313                                 if (bytes_read == 24) {
 314                                         /* we have enough to decode dev num */
 315                                         __u64 mjr; /* major */
 316                                         __u64 mnr; /* minor */
 317                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 318                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 319                                         inode->i_rdev = MKDEV(mjr, mnr);
 320                                 }
 321                         } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
 322                                 cFYI(1, ("Char device"));
 323                                 inode->i_mode |= S_IFCHR;
 324                                 if (bytes_read == 24) {
 325                                         /* we have enough to decode dev num */
 326                                         __u64 mjr; /* major */
 327                                         __u64 mnr; /* minor */
 328                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 329                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 330                                         inode->i_rdev = MKDEV(mjr, mnr);
 331                                 }
 332                         } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
 333                                 cFYI(1, ("Symlink"));
 334                                 inode->i_mode |= S_IFLNK;
 335                         } else {
 336                                 inode->i_mode |= S_IFREG; /* file? */
 337                                 rc = -EOPNOTSUPP;
 338                         }
 339                 } else {
 340                         inode->i_mode |= S_IFREG; /* then it is a file */
 341                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 342                 }
 343                 CIFSSMBClose(xid, pTcon, netfid);
 344         }
 345         return rc;
 346 }
 347
 348 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 349
 350 static int get_sfu_mode(struct inode *inode,
 351                         const unsigned char *path,
 352                         struct cifs_sb_info *cifs_sb, int xid)
 353 {
 354 #ifdef CONFIG_CIFS_XATTR
 355         ssize_t rc;
 356         char ea_value[4];
 357         __u32 mode;
 358
 359         rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
 360                         ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 361                 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 362         if (rc < 0)
 363                 return (int)rc;
 364         else if (rc > 3) {
 365                 mode = le32_to_cpu(*((__le32 *)ea_value));
 366                 inode->i_mode &= ~SFBITS_MASK;
 367                 cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
 368                 inode->i_mode = (mode &  SFBITS_MASK) | inode->i_mode;
 369                 cFYI(1, ("special mode bits 0%o", mode));
 370                 return 0;
 371         } else {
 372                 return 0;
 373         }
 374 #else
 375         return -EOPNOTSUPP;
 376 #endif
 377 }
 378
 379 /*
 380  *      Needed to setup inode data for the directory which is the
 381  *      junction to the new submount (ie to setup the fake directory
 382  *      which represents a DFS referral)
 383  */
 384 static void fill_fake_finddata(FILE_ALL_INFO *pfnd_dat,
 385                                struct super_block *sb)
 386 {
 387         memset(pfnd_dat, 0, sizeof(FILE_ALL_INFO));
 388
 389 /*      __le64 pfnd_dat->AllocationSize = cpu_to_le64(0);
 390         __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
 391         __u8 pfnd_dat->DeletePending = 0;
 392         __u8 pfnd_data->Directory = 0;
 393         __le32 pfnd_dat->EASize = 0;
 394         __u64 pfnd_dat->IndexNumber = 0;
 395         __u64 pfnd_dat->IndexNumber1 = 0;  */
 396         pfnd_dat->CreationTime =
 397                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 398         pfnd_dat->LastAccessTime =
 399                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 400         pfnd_dat->LastWriteTime =
 401                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 402         pfnd_dat->ChangeTime =
 403                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 404         pfnd_dat->Attributes = cpu_to_le32(ATTR_DIRECTORY);
 405         pfnd_dat->NumberOfLinks = cpu_to_le32(2);
 406 }
 407
 408 int cifs_get_inode_info(struct inode **pinode,
 409         const unsigned char *full_path, FILE_ALL_INFO *pfindData,
 410         struct super_block *sb, int xid, const __u16 *pfid)
 411 {
 412         int rc = 0;
 413         __u32 attr;
 414         struct cifsInodeInfo *cifsInfo;
 415         struct cifsTconInfo *pTcon;
 416         struct inode *inode;
 417         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 418         char *buf = NULL;
 419         bool adjustTZ = false;
 420         bool is_dfs_referral = false;
 421         umode_t default_mode;
 422
 423         pTcon = cifs_sb->tcon;
 424         cFYI(1, ("Getting info on %s", full_path));
 425
 426         if ((pfindData == NULL) && (*pinode != NULL)) {
 427                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 428                         cFYI(1, ("No need to revalidate cached inode sizes"));
 429                         return rc;
 430                 }
 431         }
 432
 433         /* if file info not passed in then get it from server */
 434         if (pfindData == NULL) {
 435                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 436                 if (buf == NULL)
 437                         return -ENOMEM;
 438                 pfindData = (FILE_ALL_INFO *)buf;
 439
 440                 /* could do find first instead but this returns more info */
 441                 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
 442                               0 /* not legacy */,
 443                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 444                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 445                 /* BB optimize code so we do not make the above call
 446                 when server claims no NT SMB support and the above call
 447                 failed at least once - set flag in tcon or mount */
 448                 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 449                         rc = SMBQueryInformation(xid, pTcon, full_path,
 450                                         pfindData, cifs_sb->local_nls,
 451                                         cifs_sb->mnt_cifs_flags &
 452                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 453                         adjustTZ = true;
 454                 }
 455         }
 456         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
 457         if (rc == -EREMOTE) {
 458                 is_dfs_referral = true;
 459                 fill_fake_finddata(pfindData, sb);
 460                 rc = 0;
 461         } else if (rc)
 462                 goto cgii_exit;
 463
 464         attr = le32_to_cpu(pfindData->Attributes);
 465
 466         /* get new inode */
 467         if (*pinode == NULL) {
 468                 *pinode = new_inode(sb);
 469                 if (*pinode == NULL) {
 470                         rc = -ENOMEM;
 471                         goto cgii_exit;
 472                 }
 473                 /* Is an i_ino of zero legal? Can we use that to check
 474                    if the server supports returning inode numbers?  Are
 475                    there other sanity checks we can use to ensure that
 476                    the server is really filling in that field? */
 477
 478                 /* We can not use the IndexNumber field by default from
 479                    Windows or Samba (in ALL_INFO buf) but we can request
 480                    it explicitly.  It may not be unique presumably if
 481                    the server has multiple devices mounted under one share */
 482
 483                 /* There may be higher info levels that work but are
 484                    there Windows server or network appliances for which
 485                    IndexNumber field is not guaranteed unique? */
 486
 487                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 488                         int rc1 = 0;
 489                         __u64 inode_num;
 490
 491                         rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 492                                         full_path, &inode_num,
 493                                         cifs_sb->local_nls,
 494                                         cifs_sb->mnt_cifs_flags &
 495                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 496                         if (rc1) {
 497                                 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
 498                                 /* BB EOPNOSUPP disable SERVER_INUM? */
 499                         } else /* do we need cast or hash to ino? */
 500                                 (*pinode)->i_ino = inode_num;
 501                 } /* else ino incremented to unique num in new_inode*/
 502                 if (sb->s_flags & MS_NOATIME)
 503                         (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
 504                 insert_inode_hash(*pinode);
 505         }
 506         inode = *pinode;
 507         cifsInfo = CIFS_I(inode);
 508         cifsInfo->cifsAttrs = attr;
 509         cFYI(1, ("Old time %ld", cifsInfo->time));
 510         cifsInfo->time = jiffies;
 511         cFYI(1, ("New time %ld", cifsInfo->time));
 512
 513         /* blksize needs to be multiple of two. So safer to default to
 514         blksize and blkbits set in superblock so 2**blkbits and blksize
 515         will match rather than setting to:
 516         (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 517
 518         /* Linux can not store file creation time so ignore it */
 519         if (pfindData->LastAccessTime)
 520                 inode->i_atime = cifs_NTtimeToUnix
 521                         (le64_to_cpu(pfindData->LastAccessTime));
 522         else /* do not need to use current_fs_time - time not stored */
 523                 inode->i_atime = CURRENT_TIME;
 524         inode->i_mtime =
 525                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 526         inode->i_ctime =
 527             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 528         cFYI(DBG2, ("Attributes came in as 0x%x", attr));
 529         if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
 530                 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
 531                 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
 532         }
 533
 534         /* get default inode mode */
 535         if (attr & ATTR_DIRECTORY)
 536                 default_mode = cifs_sb->mnt_dir_mode;
 537         else
 538                 default_mode = cifs_sb->mnt_file_mode;
 539
 540         /* set permission bits */
 541         if (atomic_read(&cifsInfo->inUse) == 0 ||
 542             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
 543                 inode->i_mode = default_mode;
 544         else {
 545                 /* just reenable write bits if !ATTR_READONLY */
 546                 if ((inode->i_mode & S_IWUGO) == 0 &&
 547                     (attr & ATTR_READONLY) == 0)
 548                         inode->i_mode |= (S_IWUGO & default_mode);
 549
 550                 inode->i_mode &= ~S_IFMT;
 551         }
 552         /* clear write bits if ATTR_READONLY is set */
 553         if (attr & ATTR_READONLY)
 554                 inode->i_mode &= ~S_IWUGO;
 555
 556         /* set inode type */
 557         if ((attr & ATTR_SYSTEM) &&
 558             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
 559                 /* no need to fix endianness on 0 */
 560                 if (pfindData->EndOfFile == 0)
 561                         inode->i_mode |= S_IFIFO;
 562                 else if (decode_sfu_inode(inode,
 563                                 le64_to_cpu(pfindData->EndOfFile),
 564                                 full_path, cifs_sb, xid))
 565                         cFYI(1, ("unknown SFU file type\n"));
 566         } else {
 567                 if (attr & ATTR_DIRECTORY)
 568                         inode->i_mode |= S_IFDIR;
 569                 else
 570                         inode->i_mode |= S_IFREG;
 571         }
 572
 573         spin_lock(&inode->i_lock);
 574         if (is_size_safe_to_change(cifsInfo,
 575                                    le64_to_cpu(pfindData->EndOfFile))) {
 576                 /* can not safely shrink the file size here if the
 577                    client is writing to it due to potential races */
 578                 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
 579
 580                 /* 512 bytes (2**9) is the fake blocksize that must be
 581                    used for this calculation */
 582                 inode->i_blocks = (512 - 1 + le64_to_cpu(
 583                                    pfindData->AllocationSize)) >> 9;
 584         }
 585         spin_unlock(&inode->i_lock);
 586
 587         inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 588
 589         /* BB fill in uid and gid here? with help from winbind?
 590            or retrieve from NTFS stream extended attribute */
 591 #ifdef CONFIG_CIFS_EXPERIMENTAL
 592         /* fill in 0777 bits from ACL */
 593         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 594                 cFYI(1, ("Getting mode bits from ACL"));
 595                 acl_to_uid_mode(inode, full_path, pfid);
 596         }
 597 #endif
 598         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 599                 /* fill in remaining high mode bits e.g. SUID, VTX */
 600                 get_sfu_mode(inode, full_path, cifs_sb, xid);
 601         } else if (atomic_read(&cifsInfo->inUse) == 0) {
 602                 inode->i_uid = cifs_sb->mnt_uid;
 603                 inode->i_gid = cifs_sb->mnt_gid;
 604                 /* set so we do not keep refreshing these fields with
 605                    bad data after user has changed them in memory */
 606                 atomic_set(&cifsInfo->inUse, 1);
 607         }
 608
 609         cifs_set_ops(inode, is_dfs_referral);
 610
 611
 612
 613
 614 cgii_exit:
 615         kfree(buf);
 616         return rc;
 617 }
 618
 619 static const struct inode_operations cifs_ipc_inode_ops = {
 620         .lookup = cifs_lookup,
 621 };
 622
 623 /* gets root inode */
 624 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
 625 {
 626         int xid;
 627         struct cifs_sb_info *cifs_sb;
 628         struct inode *inode;
 629         long rc;
 630
 631         inode = iget_locked(sb, ino);
 632         if (!inode)
 633                 return ERR_PTR(-ENOMEM);
 634         if (!(inode->i_state & I_NEW))
 635                 return inode;
 636
 637         cifs_sb = CIFS_SB(inode->i_sb);
 638         xid = GetXid();
 639
 640         if (cifs_sb->tcon->unix_ext)
 641                 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
 642         else
 643                 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
 644                                          NULL);
 645         if (rc && cifs_sb->tcon->ipc) {
 646                 cFYI(1, ("ipc connection - fake read inode"));
 647                 inode->i_mode |= S_IFDIR;
 648                 inode->i_nlink = 2;
 649                 inode->i_op = &cifs_ipc_inode_ops;
 650                 inode->i_fop = &simple_dir_operations;
 651                 inode->i_uid = cifs_sb->mnt_uid;
 652                 inode->i_gid = cifs_sb->mnt_gid;
 653         } else if (rc) {
 654                 _FreeXid(xid);
 655                 iget_failed(inode);
 656                 return ERR_PTR(rc);
 657         }
 658
 659         unlock_new_inode(inode);
 660
 661         /* can not call macro FreeXid here since in a void func
 662          * TODO: This is no longer true
 663          */
 664         _FreeXid(xid);
 665         return inode;
 666 }
 667
 668 static int
 669 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
 670                     char *full_path, __u32 dosattr)
 671 {
 672         int rc;
 673         int oplock = 0;
 674         __u16 netfid;
 675         __u32 netpid;
 676         bool set_time = false;
 677         struct cifsFileInfo *open_file;
 678         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 679         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 680         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 681         FILE_BASIC_INFO info_buf;
 682
 683         if (attrs->ia_valid & ATTR_ATIME) {
 684                 set_time = true;
 685                 info_buf.LastAccessTime =
 686                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
 687         } else
 688                 info_buf.LastAccessTime = 0;
 689
 690         if (attrs->ia_valid & ATTR_MTIME) {
 691                 set_time = true;
 692                 info_buf.LastWriteTime =
 693                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
 694         } else
 695                 info_buf.LastWriteTime = 0;
 696
 697         /*
 698          * Samba throws this field away, but windows may actually use it.
 699          * Do not set ctime unless other time stamps are changed explicitly
 700          * (i.e. by utimes()) since we would then have a mix of client and
 701          * server times.
 702          */
 703         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
 704                 cFYI(1, ("CIFS - CTIME changed"));
 705                 info_buf.ChangeTime =
 706                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
 707         } else
 708                 info_buf.ChangeTime = 0;
 709
 710         info_buf.CreationTime = 0;      /* don't change */
 711         info_buf.Attributes = cpu_to_le32(dosattr);
 712
 713         /*
 714          * If the file is already open for write, just use that fileid
 715          */
 716         open_file = find_writable_file(cifsInode);
 717         if (open_file) {
 718                 netfid = open_file->netfid;
 719                 netpid = open_file->pid;
 720                 goto set_via_filehandle;
 721         }
 722
 723         /*
 724          * NT4 apparently returns success on this call, but it doesn't
 725          * really work.
 726          */
 727         if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
 728                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
 729                                      &info_buf, cifs_sb->local_nls,
 730                                      cifs_sb->mnt_cifs_flags &
 731                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 732                 if (rc == 0) {
 733                         cifsInode->cifsAttrs = dosattr;
 734                         goto out;
 735                 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
 736                         goto out;
 737         }
 738
 739         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
 740                  "times not supported by this server"));
 741         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
 742                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
 743                          CREATE_NOT_DIR, &netfid, &oplock,
 744                          NULL, cifs_sb->local_nls,
 745                          cifs_sb->mnt_cifs_flags &
 746                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 747
 748         if (rc != 0) {
 749                 if (rc == -EIO)
 750                         rc = -EINVAL;
 751                 goto out;
 752         }
 753
 754         netpid = current->tgid;
 755
 756 set_via_filehandle:
 757         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
 758         if (!rc)
 759                 cifsInode->cifsAttrs = dosattr;
 760
 761         if (open_file == NULL)
 762                 CIFSSMBClose(xid, pTcon, netfid);
 763         else
 764                 atomic_dec(&open_file->wrtPending);
 765 out:
 766         return rc;
 767 }
 768
 769 /*
 770  * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 771  * and rename it to a random name that hopefully won't conflict with
 772  * anything else.
 773  */
 774 static int
 775 cifs_rename_pending_delete(char *full_path, struct inode *inode, int xid)
 776 {
 777         int oplock = 0;
 778         int rc;
 779         __u16 netfid;
 780         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 781         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 782         struct cifsTconInfo *tcon = cifs_sb->tcon;
 783         __u32 dosattr;
 784         FILE_BASIC_INFO *info_buf;
 785
 786         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 787                          DELETE|FILE_WRITE_ATTRIBUTES,
 788                          CREATE_NOT_DIR|CREATE_DELETE_ON_CLOSE,
 789                          &netfid, &oplock, NULL, cifs_sb->local_nls,
 790                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 791         if (rc != 0)
 792                 goto out;
 793
 794         /* set ATTR_HIDDEN and clear ATTR_READONLY */
 795         cifsInode = CIFS_I(inode);
 796         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
 797         if (dosattr == 0)
 798                 dosattr |= ATTR_NORMAL;
 799         dosattr |= ATTR_HIDDEN;
 800
 801         info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
 802         if (info_buf == NULL) {
 803                 rc = -ENOMEM;
 804                 goto out_close;
 805         }
 806         info_buf->Attributes = cpu_to_le32(dosattr);
 807         rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid, current->tgid);
 808         kfree(info_buf);
 809         if (rc != 0)
 810                 goto out_close;
 811         cifsInode->cifsAttrs = dosattr;
 812
 813         /* silly-rename the file */
 814         CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
 815                                    cifs_sb->mnt_cifs_flags &
 816                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 817
 818         /* set DELETE_ON_CLOSE */
 819         rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid, current->tgid);
 820
 821         /*
 822          * some samba versions return -ENOENT when we try to set the file
 823          * disposition here. Likely a samba bug, but work around it for now
 824          */
 825         if (rc == -ENOENT)
 826                 rc = 0;
 827
 828 out_close:
 829         CIFSSMBClose(xid, tcon, netfid);
 830 out:
 831         return rc;
 832 }
 833
 834 int cifs_unlink(struct inode *dir, struct dentry *dentry)
 835 {
 836         int rc = 0;
 837         int xid;
 838         char *full_path = NULL;
 839         struct inode *inode = dentry->d_inode;
 840         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 841         struct super_block *sb = dir->i_sb;
 842         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 843         struct cifsTconInfo *tcon = cifs_sb->tcon;
 844         struct iattr *attrs = NULL;
 845         __u32 dosattr = 0, origattr = 0;
 846
 847         cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
 848
 849         xid = GetXid();
 850
 851         /* Unlink can be called from rename so we can not take the
 852          * sb->s_vfs_rename_mutex here */
 853         full_path = build_path_from_dentry(dentry);
 854         if (full_path == NULL) {
 855                 FreeXid(xid);
 856                 return -ENOMEM;
 857         }
 858
 859         if ((tcon->ses->capabilities & CAP_UNIX) &&
 860                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 861                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 862                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
 863                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 864                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 865                 cFYI(1, ("posix del rc %d", rc));
 866                 if ((rc == 0) || (rc == -ENOENT))
 867                         goto psx_del_no_retry;
 868         }
 869
 870 retry_std_delete:
 871         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 872                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 873
 874 psx_del_no_retry:
 875         if (!rc) {
 876                 if (inode)
 877                         drop_nlink(inode);
 878         } else if (rc == -ENOENT) {
 879                 d_drop(dentry);
 880         } else if (rc == -ETXTBSY) {
 881                 rc = cifs_rename_pending_delete(full_path, inode, xid);
 882                 if (rc == 0)
 883                         drop_nlink(inode);
 884         } else if (rc == -EACCES && dosattr == 0) {
 885                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
 886                 if (attrs == NULL) {
 887                         rc = -ENOMEM;
 888                         goto out_reval;
 889                 }
 890
 891                 /* try to reset dos attributes */
 892                 origattr = cifsInode->cifsAttrs;
 893                 if (origattr == 0)
 894                         origattr |= ATTR_NORMAL;
 895                 dosattr = origattr & ~ATTR_READONLY;
 896                 if (dosattr == 0)
 897                         dosattr |= ATTR_NORMAL;
 898                 dosattr |= ATTR_HIDDEN;
 899
 900                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
 901                 if (rc != 0)
 902                         goto out_reval;
 903
 904                 goto retry_std_delete;
 905         }
 906
 907         /* undo the setattr if we errored out and it's needed */
 908         if (rc != 0 && dosattr != 0)
 909                 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
 910
 911 out_reval:
 912         if (inode) {
 913                 cifsInode = CIFS_I(inode);
 914                 cifsInode->time = 0;    /* will force revalidate to get info
 915                                            when needed */
 916                 inode->i_ctime = current_fs_time(sb);
 917         }
 918         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
 919         cifsInode = CIFS_I(dir);
 920         CIFS_I(dir)->time = 0;  /* force revalidate of dir as well */
 921
 922         kfree(full_path);
 923         kfree(attrs);
 924         FreeXid(xid);
 925         return rc;
 926 }
 927
 928 static void posix_fill_in_inode(struct inode *tmp_inode,
 929         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 930 {
 931         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 932         loff_t local_size;
 933         struct timespec local_mtime;
 934
 935         cifsInfo->time = jiffies;
 936         atomic_inc(&cifsInfo->inUse);
 937
 938         /* save mtime and size */
 939         local_mtime = tmp_inode->i_mtime;
 940         local_size  = tmp_inode->i_size;
 941
 942         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 943         cifs_set_ops(tmp_inode, false);
 944
 945         if (!S_ISREG(tmp_inode->i_mode))
 946                 return;
 947
 948         /*
 949          * No sense invalidating pages for new inode
 950          * since we we have not started caching
 951          * readahead file data yet.
 952          */
 953         if (isNewInode)
 954                 return;
 955
 956         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 957                 (local_size == tmp_inode->i_size)) {
 958                 cFYI(1, ("inode exists but unchanged"));
 959         } else {
 960                 /* file may have changed on server */
 961                 cFYI(1, ("invalidate inode, readdir detected change"));
 962                 invalidate_remote_inode(tmp_inode);
 963         }
 964 }
 965
 966 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 967 {
 968         int rc = 0, tmprc;
 969         int xid;
 970         struct cifs_sb_info *cifs_sb;
 971         struct cifsTconInfo *pTcon;
 972         char *full_path = NULL;
 973         struct inode *newinode = NULL;
 974
 975         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 976
 977         xid = GetXid();
 978
 979         cifs_sb = CIFS_SB(inode->i_sb);
 980         pTcon = cifs_sb->tcon;
 981
 982         full_path = build_path_from_dentry(direntry);
 983         if (full_path == NULL) {
 984                 FreeXid(xid);
 985                 return -ENOMEM;
 986         }
 987
 988         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 989                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 990                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 991                 u32 oplock = 0;
 992                 FILE_UNIX_BASIC_INFO *pInfo =
 993                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 994                 if (pInfo == NULL) {
 995                         rc = -ENOMEM;
 996                         goto mkdir_out;
 997                 }
 998
 999                 mode &= ~current->fs->umask;
1000                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1001                                 mode, NULL /* netfid */, pInfo, &oplock,
1002                                 full_path, cifs_sb->local_nls,
1003                                 cifs_sb->mnt_cifs_flags &
1004                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1005                 if (rc == -EOPNOTSUPP) {
1006                         kfree(pInfo);
1007                         goto mkdir_retry_old;
1008                 } else if (rc) {
1009                         cFYI(1, ("posix mkdir returned 0x%x", rc));
1010                         d_drop(direntry);
1011                 } else {
1012                         if (pInfo->Type == cpu_to_le32(-1)) {
1013                                 /* no return info, go query for it */
1014                                 kfree(pInfo);
1015                                 goto mkdir_get_info;
1016                         }
1017 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1018         to set uid/gid */
1019                         inc_nlink(inode);
1020                         if (pTcon->nocase)
1021                                 direntry->d_op = &cifs_ci_dentry_ops;
1022                         else
1023                                 direntry->d_op = &cifs_dentry_ops;
1024
1025                         newinode = new_inode(inode->i_sb);
1026                         if (newinode == NULL) {
1027                                 kfree(pInfo);
1028                                 goto mkdir_get_info;
1029                         }
1030
1031                         /* Is an i_ino of zero legal? */
1032                         /* Are there sanity checks we can use to ensure that
1033                            the server is really filling in that field? */
1034                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1035                                 newinode->i_ino =
1036                                         (unsigned long)pInfo->UniqueId;
1037                         } /* note ino incremented to unique num in new_inode */
1038                         if (inode->i_sb->s_flags & MS_NOATIME)
1039                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
1040                         newinode->i_nlink = 2;
1041
1042                         insert_inode_hash(newinode);
1043                         d_instantiate(direntry, newinode);
1044
1045                         /* we already checked in POSIXCreate whether
1046                            frame was long enough */
1047                         posix_fill_in_inode(direntry->d_inode,
1048                                         pInfo, 1 /* NewInode */);
1049 #ifdef CONFIG_CIFS_DEBUG2
1050                         cFYI(1, ("instantiated dentry %p %s to inode %p",
1051                                 direntry, direntry->d_name.name, newinode));
1052
1053                         if (newinode->i_nlink != 2)
1054                                 cFYI(1, ("unexpected number of links %d",
1055                                         newinode->i_nlink));
1056 #endif
1057                 }
1058                 kfree(pInfo);
1059                 goto mkdir_out;
1060         }
1061 mkdir_retry_old:
1062         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1063         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1064                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1065         if (rc) {
1066                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1067                 d_drop(direntry);
1068         } else {
1069 mkdir_get_info:
1070                 inc_nlink(inode);
1071                 if (pTcon->unix_ext)
1072                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1073                                                       inode->i_sb, xid);
1074                 else
1075                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1076                                                  inode->i_sb, xid, NULL);
1077
1078                 if (pTcon->nocase)
1079                         direntry->d_op = &cifs_ci_dentry_ops;
1080                 else
1081                         direntry->d_op = &cifs_dentry_ops;
1082                 d_instantiate(direntry, newinode);
1083                  /* setting nlink not necessary except in cases where we
1084                   * failed to get it from the server or was set bogus */
1085                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1086                                 direntry->d_inode->i_nlink = 2;
1087
1088                 mode &= ~current->fs->umask;
1089                 /* must turn on setgid bit if parent dir has it */
1090                 if (inode->i_mode & S_ISGID)
1091                         mode |= S_ISGID;
1092
1093                 if (pTcon->unix_ext) {
1094                         struct cifs_unix_set_info_args args = {
1095                                 .mode   = mode,
1096                                 .ctime  = NO_CHANGE_64,
1097                                 .atime  = NO_CHANGE_64,
1098                                 .mtime  = NO_CHANGE_64,
1099                                 .device = 0,
1100                         };
1101                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1102                                 args.uid = (__u64)current->fsuid;
1103                                 if (inode->i_mode & S_ISGID)
1104                                         args.gid = (__u64)inode->i_gid;
1105                                 else
1106                                         args.gid = (__u64)current->fsgid;
1107                         } else {
1108                                 args.uid = NO_CHANGE_64;
1109                                 args.gid = NO_CHANGE_64;
1110                         }
1111                         CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1112                                             cifs_sb->local_nls,
1113                                             cifs_sb->mnt_cifs_flags &
1114                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1115                 } else {
1116                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1117                             (mode & S_IWUGO) == 0) {
1118                                 FILE_BASIC_INFO pInfo;
1119                                 struct cifsInodeInfo *cifsInode;
1120                                 u32 dosattrs;
1121
1122                                 memset(&pInfo, 0, sizeof(pInfo));
1123                                 cifsInode = CIFS_I(newinode);
1124                                 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1125                                 pInfo.Attributes = cpu_to_le32(dosattrs);
1126                                 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1127                                                 full_path, &pInfo,
1128                                                 cifs_sb->local_nls,
1129                                                 cifs_sb->mnt_cifs_flags &
1130                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1131                                 if (tmprc == 0)
1132                                         cifsInode->cifsAttrs = dosattrs;
1133                         }
1134                         if (direntry->d_inode) {
1135                                 if (cifs_sb->mnt_cifs_flags &
1136                                      CIFS_MOUNT_DYNPERM)
1137                                         direntry->d_inode->i_mode =
1138                                                 (mode | S_IFDIR);
1139
1140                                 if (cifs_sb->mnt_cifs_flags &
1141                                      CIFS_MOUNT_SET_UID) {
1142                                         direntry->d_inode->i_uid =
1143                                                 current->fsuid;
1144                                         if (inode->i_mode & S_ISGID)
1145                                                 direntry->d_inode->i_gid =
1146                                                         inode->i_gid;
1147                                         else
1148                                                 direntry->d_inode->i_gid =
1149                                                         current->fsgid;
1150                                 }
1151                         }
1152                 }
1153         }
1154 mkdir_out:
1155         kfree(full_path);
1156         FreeXid(xid);
1157         return rc;
1158 }
1159
1160 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1161 {
1162         int rc = 0;
1163         int xid;
1164         struct cifs_sb_info *cifs_sb;
1165         struct cifsTconInfo *pTcon;
1166         char *full_path = NULL;
1167         struct cifsInodeInfo *cifsInode;
1168
1169         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1170
1171         xid = GetXid();
1172
1173         cifs_sb = CIFS_SB(inode->i_sb);
1174         pTcon = cifs_sb->tcon;
1175
1176         full_path = build_path_from_dentry(direntry);
1177         if (full_path == NULL) {
1178                 FreeXid(xid);
1179                 return -ENOMEM;
1180         }
1181
1182         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1183                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1184
1185         if (!rc) {
1186                 drop_nlink(inode);
1187                 spin_lock(&direntry->d_inode->i_lock);
1188                 i_size_write(direntry->d_inode, 0);
1189                 clear_nlink(direntry->d_inode);
1190                 spin_unlock(&direntry->d_inode->i_lock);
1191         }
1192
1193         cifsInode = CIFS_I(direntry->d_inode);
1194         cifsInode->time = 0;    /* force revalidate to go get info when
1195                                    needed */
1196         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1197                 current_fs_time(inode->i_sb);
1198
1199         kfree(full_path);
1200         FreeXid(xid);
1201         return rc;
1202 }
1203
1204 static int
1205 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1206                 struct dentry *to_dentry, const char *toPath)
1207 {
1208         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1209         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1210         __u16 srcfid;
1211         int oplock, rc;
1212
1213         /* try path-based rename first */
1214         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1215                            cifs_sb->mnt_cifs_flags &
1216                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1217
1218         /*
1219          * don't bother with rename by filehandle unless file is busy and
1220          * source Note that cross directory moves do not work with
1221          * rename by filehandle to various Windows servers.
1222          */
1223         if (rc == 0 || rc != -ETXTBSY)
1224                 return rc;
1225
1226         /* open the file to be renamed -- we need DELETE perms */
1227         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1228                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1229                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1230                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1231
1232         if (rc == 0) {
1233                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1234                                 (const char *) to_dentry->d_name.name,
1235                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1236                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1237
1238                 CIFSSMBClose(xid, pTcon, srcfid);
1239         }
1240
1241         return rc;
1242 }
1243
1244 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1245         struct inode *target_inode, struct dentry *target_direntry)
1246 {
1247         char *fromName = NULL;
1248         char *toName = NULL;
1249         struct cifs_sb_info *cifs_sb_source;
1250         struct cifs_sb_info *cifs_sb_target;
1251         struct cifsTconInfo *pTcon;
1252         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1253         FILE_UNIX_BASIC_INFO *info_buf_target;
1254         int xid;
1255         int rc;
1256
1257         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1258         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1259         pTcon = cifs_sb_source->tcon;
1260
1261         xid = GetXid();
1262
1263         /*
1264          * BB: this might be allowed if same server, but different share.
1265          * Consider adding support for this
1266          */
1267         if (pTcon != cifs_sb_target->tcon) {
1268                 rc = -EXDEV;
1269                 goto cifs_rename_exit;
1270         }
1271
1272         /*
1273          * we already have the rename sem so we do not need to
1274          * grab it again here to protect the path integrity
1275          */
1276         fromName = build_path_from_dentry(source_direntry);
1277         if (fromName == NULL) {
1278                 rc = -ENOMEM;
1279                 goto cifs_rename_exit;
1280         }
1281
1282         toName = build_path_from_dentry(target_direntry);
1283         if (toName == NULL) {
1284                 rc = -ENOMEM;
1285                 goto cifs_rename_exit;
1286         }
1287
1288         rc = cifs_do_rename(xid, source_direntry, fromName,
1289                             target_direntry, toName);
1290
1291         if (rc == -EEXIST) {
1292                 if (pTcon->unix_ext) {
1293                         /*
1294                          * Are src and dst hardlinks of same inode? We can
1295                          * only tell with unix extensions enabled
1296                          */
1297                         info_buf_source =
1298                                 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1299                                                 GFP_KERNEL);
1300                         if (info_buf_source == NULL)
1301                                 goto unlink_target;
1302
1303                         info_buf_target = info_buf_source + 1;
1304                         rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1305                                                 info_buf_source,
1306                                                 cifs_sb_source->local_nls,
1307                                                 cifs_sb_source->mnt_cifs_flags &
1308                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1309                         if (rc != 0)
1310                                 goto unlink_target;
1311
1312                         rc = CIFSSMBUnixQPathInfo(xid, pTcon,
1313                                                 toName, info_buf_target,
1314                                                 cifs_sb_target->local_nls,
1315                                                 /* remap based on source sb */
1316                                                 cifs_sb_source->mnt_cifs_flags &
1317                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1318
1319                         if (rc == 0 && (info_buf_source->UniqueId ==
1320                                         info_buf_target->UniqueId))
1321                                 /* same file, POSIX says that this is a noop */
1322                                 goto cifs_rename_exit;
1323                 } /* else ... BB we could add the same check for Windows by
1324                      checking the UniqueId via FILE_INTERNAL_INFO */
1325 unlink_target:
1326                 /*
1327                  * we either can not tell the files are hardlinked (as with
1328                  * Windows servers) or files are not hardlinked. Delete the
1329                  * target manually before renaming to follow POSIX rather than
1330                  * Windows semantics
1331                  */
1332                 cifs_unlink(target_inode, target_direntry);
1333                 rc = cifs_do_rename(xid, source_direntry, fromName,
1334                                     target_direntry, toName);
1335         }
1336
1337 cifs_rename_exit:
1338         kfree(info_buf_source);
1339         kfree(fromName);
1340         kfree(toName);
1341         FreeXid(xid);
1342         return rc;
1343 }
1344
1345 int cifs_revalidate(struct dentry *direntry)
1346 {
1347         int xid;
1348         int rc = 0, wbrc = 0;
1349         char *full_path;
1350         struct cifs_sb_info *cifs_sb;
1351         struct cifsInodeInfo *cifsInode;
1352         loff_t local_size;
1353         struct timespec local_mtime;
1354         bool invalidate_inode = false;
1355
1356         if (direntry->d_inode == NULL)
1357                 return -ENOENT;
1358
1359         cifsInode = CIFS_I(direntry->d_inode);
1360
1361         if (cifsInode == NULL)
1362                 return -ENOENT;
1363
1364         /* no sense revalidating inode info on file that no one can write */
1365         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1366                 return rc;
1367
1368         xid = GetXid();
1369
1370         cifs_sb = CIFS_SB(direntry->d_sb);
1371
1372         /* can not safely grab the rename sem here if rename calls revalidate
1373            since that would deadlock */
1374         full_path = build_path_from_dentry(direntry);
1375         if (full_path == NULL) {
1376                 FreeXid(xid);
1377                 return -ENOMEM;
1378         }
1379         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1380                  "jiffies %ld", full_path, direntry->d_inode,
1381                  direntry->d_inode->i_count.counter, direntry,
1382                  direntry->d_time, jiffies));
1383
1384         if (cifsInode->time == 0) {
1385                 /* was set to zero previously to force revalidate */
1386         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1387                    lookupCacheEnabled) {
1388                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1389                     (direntry->d_inode->i_nlink == 1)) {
1390                         kfree(full_path);
1391                         FreeXid(xid);
1392                         return rc;
1393                 } else {
1394                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1395                 }
1396         }
1397
1398         /* save mtime and size */
1399         local_mtime = direntry->d_inode->i_mtime;
1400         local_size = direntry->d_inode->i_size;
1401
1402         if (cifs_sb->tcon->unix_ext) {
1403                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1404                                               direntry->d_sb, xid);
1405                 if (rc) {
1406                         cFYI(1, ("error on getting revalidate info %d", rc));
1407 /*                      if (rc != -ENOENT)
1408                                 rc = 0; */      /* BB should we cache info on
1409                                                    certain errors? */
1410                 }
1411         } else {
1412                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1413                                          direntry->d_sb, xid, NULL);
1414                 if (rc) {
1415                         cFYI(1, ("error on getting revalidate info %d", rc));
1416 /*                      if (rc != -ENOENT)
1417                                 rc = 0; */      /* BB should we cache info on
1418                                                    certain errors? */
1419                 }
1420         }
1421         /* should we remap certain errors, access denied?, to zero */
1422
1423         /* if not oplocked, we invalidate inode pages if mtime or file size
1424            had changed on server */
1425
1426         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1427             (local_size == direntry->d_inode->i_size)) {
1428                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1429         } else {
1430                 /* file may have changed on server */
1431                 if (cifsInode->clientCanCacheRead) {
1432                         /* no need to invalidate inode pages since we were the
1433                            only ones who could have modified the file and the
1434                            server copy is staler than ours */
1435                 } else {
1436                         invalidate_inode = true;
1437                 }
1438         }
1439
1440         /* can not grab this sem since kernel filesys locking documentation
1441            indicates i_mutex may be taken by the kernel on lookup and rename
1442            which could deadlock if we grab the i_mutex here as well */
1443 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1444         /* need to write out dirty pages here  */
1445         if (direntry->d_inode->i_mapping) {
1446                 /* do we need to lock inode until after invalidate completes
1447                    below? */
1448                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1449                 if (wbrc)
1450                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1451         }
1452         if (invalidate_inode) {
1453         /* shrink_dcache not necessary now that cifs dentry ops
1454         are exported for negative dentries */
1455 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1456                         shrink_dcache_parent(direntry); */
1457                 if (S_ISREG(direntry->d_inode->i_mode)) {
1458                         if (direntry->d_inode->i_mapping) {
1459                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1460                                 if (wbrc)
1461                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1462                         }
1463                         /* may eventually have to do this for open files too */
1464                         if (list_empty(&(cifsInode->openFileList))) {
1465                                 /* changed on server - flush read ahead pages */
1466                                 cFYI(1, ("Invalidating read ahead data on "
1467                                          "closed file"));
1468                                 invalidate_remote_inode(direntry->d_inode);
1469                         }
1470                 }
1471         }
1472 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1473
1474         kfree(full_path);
1475         FreeXid(xid);
1476         return rc;
1477 }
1478
1479 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1480         struct kstat *stat)
1481 {
1482         int err = cifs_revalidate(dentry);
1483         if (!err) {
1484                 generic_fillattr(dentry->d_inode, stat);
1485                 stat->blksize = CIFS_MAX_MSGSIZE;
1486         }
1487         return err;
1488 }
1489
1490 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1491 {
1492         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1493         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1494         struct page *page;
1495         int rc = 0;
1496
1497         page = grab_cache_page(mapping, index);
1498         if (!page)
1499                 return -ENOMEM;
1500
1501         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1502         unlock_page(page);
1503         page_cache_release(page);
1504         return rc;
1505 }
1506
1507 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1508 {
1509         struct address_space *mapping = inode->i_mapping;
1510         unsigned long limit;
1511
1512         spin_lock(&inode->i_lock);
1513         if (inode->i_size < offset)
1514                 goto do_expand;
1515         /*
1516          * truncation of in-use swapfiles is disallowed - it would cause
1517          * subsequent swapout to scribble on the now-freed blocks.
1518          */
1519         if (IS_SWAPFILE(inode)) {
1520                 spin_unlock(&inode->i_lock);
1521                 goto out_busy;
1522         }
1523         i_size_write(inode, offset);
1524         spin_unlock(&inode->i_lock);
1525         /*
1526          * unmap_mapping_range is called twice, first simply for efficiency
1527          * so that truncate_inode_pages does fewer single-page unmaps. However
1528          * after this first call, and before truncate_inode_pages finishes,
1529          * it is possible for private pages to be COWed, which remain after
1530          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1531          * call must be made for correctness.
1532          */
1533         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1534         truncate_inode_pages(mapping, offset);
1535         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1536         goto out_truncate;
1537
1538 do_expand:
1539         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1540         if (limit != RLIM_INFINITY && offset > limit) {
1541                 spin_unlock(&inode->i_lock);
1542                 goto out_sig;
1543         }
1544         if (offset > inode->i_sb->s_maxbytes) {
1545                 spin_unlock(&inode->i_lock);
1546                 goto out_big;
1547         }
1548         i_size_write(inode, offset);
1549         spin_unlock(&inode->i_lock);
1550 out_truncate:
1551         if (inode->i_op && inode->i_op->truncate)
1552                 inode->i_op->truncate(inode);
1553         return 0;
1554 out_sig:
1555         send_sig(SIGXFSZ, current, 0);
1556 out_big:
1557         return -EFBIG;
1558 out_busy:
1559         return -ETXTBSY;
1560 }
1561
1562 static int
1563 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1564                    int xid, char *full_path)
1565 {
1566         int rc;
1567         struct cifsFileInfo *open_file;
1568         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1569         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1570         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1571
1572         /*
1573          * To avoid spurious oplock breaks from server, in the case of
1574          * inodes that we already have open, avoid doing path based
1575          * setting of file size if we can do it by handle.
1576          * This keeps our caching token (oplock) and avoids timeouts
1577          * when the local oplock break takes longer to flush
1578          * writebehind data than the SMB timeout for the SetPathInfo
1579          * request would allow
1580          */
1581         open_file = find_writable_file(cifsInode);
1582         if (open_file) {
1583                 __u16 nfid = open_file->netfid;
1584                 __u32 npid = open_file->pid;
1585                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1586                                         npid, false);
1587                 atomic_dec(&open_file->wrtPending);
1588                 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1589                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1590                         unsigned int bytes_written;
1591                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1592                                           &bytes_written, NULL, NULL, 1);
1593                         cFYI(1, ("Wrt seteof rc %d", rc));
1594                 }
1595         } else
1596                 rc = -EINVAL;
1597
1598         if (rc != 0) {
1599                 /* Set file size by pathname rather than by handle
1600                    either because no valid, writeable file handle for
1601                    it was found or because there was an error setting
1602                    it by handle */
1603                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1604                                    false, cifs_sb->local_nls,
1605                                    cifs_sb->mnt_cifs_flags &
1606                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1607                 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1608                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1609                         __u16 netfid;
1610                         int oplock = 0;
1611
1612                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1613                                 FILE_OPEN, GENERIC_WRITE,
1614                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1615                                 cifs_sb->local_nls,
1616                                 cifs_sb->mnt_cifs_flags &
1617                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1618                         if (rc == 0) {
1619                                 unsigned int bytes_written;
1620                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1621                                                   attrs->ia_size,
1622                                                   &bytes_written, NULL,
1623                                                   NULL, 1);
1624                                 cFYI(1, ("wrt seteof rc %d", rc));
1625                                 CIFSSMBClose(xid, pTcon, netfid);
1626                         }
1627                 }
1628         }
1629
1630         if (rc == 0) {
1631                 rc = cifs_vmtruncate(inode, attrs->ia_size);
1632                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1633         }
1634
1635         return rc;
1636 }
1637
1638 static int
1639 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1640 {
1641         int rc;
1642         int xid;
1643         char *full_path = NULL;
1644         struct inode *inode = direntry->d_inode;
1645         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1646         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1647         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1648         struct cifs_unix_set_info_args *args = NULL;
1649
1650         cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1651                  direntry->d_name.name, attrs->ia_valid));
1652
1653         xid = GetXid();
1654
1655         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1656                 /* check if we have permission to change attrs */
1657                 rc = inode_change_ok(inode, attrs);
1658                 if (rc < 0)
1659                         goto out;
1660                 else
1661                         rc = 0;
1662         }
1663
1664         full_path = build_path_from_dentry(direntry);
1665         if (full_path == NULL) {
1666                 rc = -ENOMEM;
1667                 goto out;
1668         }
1669
1670         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1671                 /*
1672                    Flush data before changing file size or changing the last
1673                    write time of the file on the server. If the
1674                    flush returns error, store it to report later and continue.
1675                    BB: This should be smarter. Why bother flushing pages that
1676                    will be truncated anyway? Also, should we error out here if
1677                    the flush returns error?
1678                  */
1679                 rc = filemap_write_and_wait(inode->i_mapping);
1680                 if (rc != 0) {
1681                         cifsInode->write_behind_rc = rc;
1682                         rc = 0;
1683                 }
1684         }
1685
1686         if (attrs->ia_valid & ATTR_SIZE) {
1687                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1688                 if (rc != 0)
1689                         goto out;
1690         }
1691
1692         /* skip mode change if it's just for clearing setuid/setgid */
1693         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1694                 attrs->ia_valid &= ~ATTR_MODE;
1695
1696         args = kmalloc(sizeof(*args), GFP_KERNEL);
1697         if (args == NULL) {
1698                 rc = -ENOMEM;
1699                 goto out;
1700         }
1701
1702         /* set up the struct */
1703         if (attrs->ia_valid & ATTR_MODE)
1704                 args->mode = attrs->ia_mode;
1705         else
1706                 args->mode = NO_CHANGE_64;
1707
1708         if (attrs->ia_valid & ATTR_UID)
1709                 args->uid = attrs->ia_uid;
1710         else
1711                 args->uid = NO_CHANGE_64;
1712
1713         if (attrs->ia_valid & ATTR_GID)
1714                 args->gid = attrs->ia_gid;
1715         else
1716                 args->gid = NO_CHANGE_64;
1717
1718         if (attrs->ia_valid & ATTR_ATIME)
1719                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1720         else
1721                 args->atime = NO_CHANGE_64;
1722
1723         if (attrs->ia_valid & ATTR_MTIME)
1724                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1725         else
1726                 args->mtime = NO_CHANGE_64;
1727
1728         if (attrs->ia_valid & ATTR_CTIME)
1729                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1730         else
1731                 args->ctime = NO_CHANGE_64;
1732
1733         args->device = 0;
1734         rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1735                                 cifs_sb->local_nls,
1736                                 cifs_sb->mnt_cifs_flags &
1737                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1738
1739         if (!rc)
1740                 rc = inode_setattr(inode, attrs);
1741 out:
1742         kfree(args);
1743         kfree(full_path);
1744         FreeXid(xid);
1745         return rc;
1746 }
1747
1748 static int
1749 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1750 {
1751         int xid;
1752         struct inode *inode = direntry->d_inode;
1753         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1754         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1755         char *full_path = NULL;
1756         int rc = -EACCES;
1757         __u32 dosattr = 0;
1758         __u64 mode = NO_CHANGE_64;
1759
1760         xid = GetXid();
1761
1762         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1763                  direntry->d_name.name, attrs->ia_valid));
1764
1765         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1766                 /* check if we have permission to change attrs */
1767                 rc = inode_change_ok(inode, attrs);
1768                 if (rc < 0) {
1769                         FreeXid(xid);
1770                         return rc;
1771                 } else
1772                         rc = 0;
1773         }
1774
1775         full_path = build_path_from_dentry(direntry);
1776         if (full_path == NULL) {
1777                 FreeXid(xid);
1778                 return -ENOMEM;
1779         }
1780
1781         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1782                 /*
1783                    Flush data before changing file size or changing the last
1784                    write time of the file on the server. If the
1785                    flush returns error, store it to report later and continue.
1786                    BB: This should be smarter. Why bother flushing pages that
1787                    will be truncated anyway? Also, should we error out here if
1788                    the flush returns error?
1789                  */
1790                 rc = filemap_write_and_wait(inode->i_mapping);
1791                 if (rc != 0) {
1792                         cifsInode->write_behind_rc = rc;
1793                         rc = 0;
1794                 }
1795         }
1796
1797         if (attrs->ia_valid & ATTR_SIZE) {
1798                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1799                 if (rc != 0)
1800                         goto cifs_setattr_exit;
1801         }
1802
1803         /*
1804          * Without unix extensions we can't send ownership changes to the
1805          * server, so silently ignore them. This is consistent with how
1806          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1807          * CIFSACL support + proper Windows to Unix idmapping, we may be
1808          * able to support this in the future.
1809          */
1810         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1811                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1812
1813         /* skip mode change if it's just for clearing setuid/setgid */
1814         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1815                 attrs->ia_valid &= ~ATTR_MODE;
1816
1817         if (attrs->ia_valid & ATTR_MODE) {
1818                 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1819                 mode = attrs->ia_mode;
1820         }
1821
1822         if (attrs->ia_valid & ATTR_MODE) {
1823                 rc = 0;
1824 #ifdef CONFIG_CIFS_EXPERIMENTAL
1825                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1826                         rc = mode_to_acl(inode, full_path, mode);
1827                 else
1828 #endif
1829                 if (((mode & S_IWUGO) == 0) &&
1830                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1831
1832                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1833
1834                         /* fix up mode if we're not using dynperm */
1835                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1836                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1837                 } else if ((mode & S_IWUGO) &&
1838                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
1839
1840                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1841                         /* Attributes of 0 are ignored */
1842                         if (dosattr == 0)
1843                                 dosattr |= ATTR_NORMAL;
1844
1845                         /* reset local inode permissions to normal */
1846                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1847                                 attrs->ia_mode &= ~(S_IALLUGO);
1848                                 if (S_ISDIR(inode->i_mode))
1849                                         attrs->ia_mode |=
1850                                                 cifs_sb->mnt_dir_mode;
1851                                 else
1852                                         attrs->ia_mode |=
1853                                                 cifs_sb->mnt_file_mode;
1854                         }
1855                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1856                         /* ignore mode change - ATTR_READONLY hasn't changed */
1857                         attrs->ia_valid &= ~ATTR_MODE;
1858                 }
1859         }
1860
1861         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1862             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1863                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1864                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1865
1866                 /* Even if error on time set, no sense failing the call if
1867                 the server would set the time to a reasonable value anyway,
1868                 and this check ensures that we are not being called from
1869                 sys_utimes in which case we ought to fail the call back to
1870                 the user when the server rejects the call */
1871                 if ((rc) && (attrs->ia_valid &
1872                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1873                         rc = 0;
1874         }
1875
1876         /* do not need local check to inode_check_ok since the server does
1877            that */
1878         if (!rc)
1879                 rc = inode_setattr(inode, attrs);
1880 cifs_setattr_exit:
1881         kfree(full_path);
1882         FreeXid(xid);
1883         return rc;
1884 }
1885
1886 int
1887 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1888 {
1889         struct inode *inode = direntry->d_inode;
1890         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1891         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1892
1893         if (pTcon->unix_ext)
1894                 return cifs_setattr_unix(direntry, attrs);
1895
1896         return cifs_setattr_nounix(direntry, attrs);
1897
1898         /* BB: add cifs_setattr_legacy for really old servers */
1899 }
1900
1901 #if 0
1902 void cifs_delete_inode(struct inode *inode)
1903 {
1904         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1905         /* may have to add back in if and when safe distributed caching of
1906            directories added e.g. via FindNotify */
1907 }
1908 #endif