SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 != -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, CREATE_NOT_DIR,
 782                          &netfid, &oplock, NULL, cifs_sb->local_nls,
 783                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 784         if (rc != 0)
 785                 goto out;
 786
 787         /* set ATTR_HIDDEN and clear ATTR_READONLY */
 788         cifsInode = CIFS_I(inode);
 789         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
 790         if (dosattr == 0)
 791                 dosattr |= ATTR_NORMAL;
 792         dosattr |= ATTR_HIDDEN;
 793
 794         info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
 795         if (info_buf == NULL) {
 796                 rc = -ENOMEM;
 797                 goto out_close;
 798         }
 799         info_buf->Attributes = cpu_to_le32(dosattr);
 800         rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid, current->tgid);
 801         kfree(info_buf);
 802         if (rc != 0)
 803                 goto out_close;
 804
 805         /* silly-rename the file */
 806         rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
 807                                    cifs_sb->mnt_cifs_flags &
 808                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 809         if (rc != 0)
 810                 goto out_close;
 811
 812         /* set DELETE_ON_CLOSE */
 813         rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid, current->tgid);
 814
 815 out_close:
 816         CIFSSMBClose(xid, tcon, netfid);
 817 out:
 818         return rc;
 819 }
 820
 821 int cifs_unlink(struct inode *dir, struct dentry *dentry)
 822 {
 823         int rc = 0;
 824         int xid;
 825         char *full_path = NULL;
 826         struct inode *inode = dentry->d_inode;
 827         struct cifsInodeInfo *cifsInode;
 828         struct super_block *sb = dir->i_sb;
 829         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 830         struct cifsTconInfo *tcon = cifs_sb->tcon;
 831         struct iattr *attrs;
 832         __u32 dosattr;
 833
 834         cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
 835
 836         xid = GetXid();
 837
 838         /* Unlink can be called from rename so we can not take the
 839          * sb->s_vfs_rename_mutex here */
 840         full_path = build_path_from_dentry(dentry);
 841         if (full_path == NULL) {
 842                 FreeXid(xid);
 843                 return -ENOMEM;
 844         }
 845
 846         if ((tcon->ses->capabilities & CAP_UNIX) &&
 847                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 848                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 849                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
 850                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 851                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 852                 cFYI(1, ("posix del rc %d", rc));
 853                 if ((rc == 0) || (rc == -ENOENT))
 854                         goto psx_del_no_retry;
 855         }
 856
 857         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 858                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 859 psx_del_no_retry:
 860         if (!rc) {
 861                 if (inode)
 862                         drop_nlink(inode);
 863         } else if (rc == -ENOENT) {
 864                 d_drop(dentry);
 865         } else if (rc == -ETXTBSY) {
 866                 rc = cifs_rename_pending_delete(full_path, inode, xid);
 867                 if (rc == 0)
 868                         drop_nlink(inode);
 869         } else if (rc == -EACCES) {
 870                 /* try only if r/o attribute set in local lookup data? */
 871                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
 872                 if (attrs == NULL) {
 873                         rc = -ENOMEM;
 874                         goto out_reval;
 875                 }
 876
 877                 /* try to reset dos attributes */
 878                 cifsInode = CIFS_I(inode);
 879                 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
 880                 if (dosattr == 0)
 881                         dosattr |= ATTR_NORMAL;
 882                 dosattr |= ATTR_HIDDEN;
 883
 884                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
 885                 kfree(attrs);
 886                 if (rc != 0)
 887                         goto out_reval;
 888                 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 889                                     cifs_sb->mnt_cifs_flags &
 890                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 891                 if (rc == 0) {
 892                         if (inode)
 893                                 drop_nlink(inode);
 894                 } else if (rc == -ETXTBSY) {
 895                         rc = cifs_rename_pending_delete(full_path, inode, xid);
 896                         if (rc == 0)
 897                                 drop_nlink(inode);
 898                 }
 899         }
 900 out_reval:
 901         if (inode) {
 902                 cifsInode = CIFS_I(inode);
 903                 cifsInode->time = 0;    /* will force revalidate to get info
 904                                            when needed */
 905                 inode->i_ctime = current_fs_time(sb);
 906         }
 907         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
 908         cifsInode = CIFS_I(dir);
 909         cifsInode->time = 0;    /* force revalidate of dir as well */
 910
 911         kfree(full_path);
 912         FreeXid(xid);
 913         return rc;
 914 }
 915
 916 static void posix_fill_in_inode(struct inode *tmp_inode,
 917         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 918 {
 919         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 920         loff_t local_size;
 921         struct timespec local_mtime;
 922
 923         cifsInfo->time = jiffies;
 924         atomic_inc(&cifsInfo->inUse);
 925
 926         /* save mtime and size */
 927         local_mtime = tmp_inode->i_mtime;
 928         local_size  = tmp_inode->i_size;
 929
 930         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 931         cifs_set_ops(tmp_inode, false);
 932
 933         if (!S_ISREG(tmp_inode->i_mode))
 934                 return;
 935
 936         /*
 937          * No sense invalidating pages for new inode
 938          * since we we have not started caching
 939          * readahead file data yet.
 940          */
 941         if (isNewInode)
 942                 return;
 943
 944         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 945                 (local_size == tmp_inode->i_size)) {
 946                 cFYI(1, ("inode exists but unchanged"));
 947         } else {
 948                 /* file may have changed on server */
 949                 cFYI(1, ("invalidate inode, readdir detected change"));
 950                 invalidate_remote_inode(tmp_inode);
 951         }
 952 }
 953
 954 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 955 {
 956         int rc = 0;
 957         int xid;
 958         struct cifs_sb_info *cifs_sb;
 959         struct cifsTconInfo *pTcon;
 960         char *full_path = NULL;
 961         struct inode *newinode = NULL;
 962
 963         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 964
 965         xid = GetXid();
 966
 967         cifs_sb = CIFS_SB(inode->i_sb);
 968         pTcon = cifs_sb->tcon;
 969
 970         full_path = build_path_from_dentry(direntry);
 971         if (full_path == NULL) {
 972                 FreeXid(xid);
 973                 return -ENOMEM;
 974         }
 975
 976         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 977                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 978                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 979                 u32 oplock = 0;
 980                 FILE_UNIX_BASIC_INFO *pInfo =
 981                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 982                 if (pInfo == NULL) {
 983                         rc = -ENOMEM;
 984                         goto mkdir_out;
 985                 }
 986
 987                 mode &= ~current->fs->umask;
 988                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
 989                                 mode, NULL /* netfid */, pInfo, &oplock,
 990                                 full_path, cifs_sb->local_nls,
 991                                 cifs_sb->mnt_cifs_flags &
 992                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 993                 if (rc == -EOPNOTSUPP) {
 994                         kfree(pInfo);
 995                         goto mkdir_retry_old;
 996                 } else if (rc) {
 997                         cFYI(1, ("posix mkdir returned 0x%x", rc));
 998                         d_drop(direntry);
 999                 } else {
1000                         if (pInfo->Type == cpu_to_le32(-1)) {
1001                                 /* no return info, go query for it */
1002                                 kfree(pInfo);
1003                                 goto mkdir_get_info;
1004                         }
1005 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1006         to set uid/gid */
1007                         inc_nlink(inode);
1008                         if (pTcon->nocase)
1009                                 direntry->d_op = &cifs_ci_dentry_ops;
1010                         else
1011                                 direntry->d_op = &cifs_dentry_ops;
1012
1013                         newinode = new_inode(inode->i_sb);
1014                         if (newinode == NULL) {
1015                                 kfree(pInfo);
1016                                 goto mkdir_get_info;
1017                         }
1018                         /* Is an i_ino of zero legal? */
1019                         /* Are there sanity checks we can use to ensure that
1020                            the server is really filling in that field? */
1021                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1022                                 newinode->i_ino =
1023                                         (unsigned long)pInfo->UniqueId;
1024                         } /* note ino incremented to unique num in new_inode */
1025                         if (inode->i_sb->s_flags & MS_NOATIME)
1026                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
1027                         newinode->i_nlink = 2;
1028
1029                         insert_inode_hash(newinode);
1030                         d_instantiate(direntry, newinode);
1031
1032                         /* we already checked in POSIXCreate whether
1033                            frame was long enough */
1034                         posix_fill_in_inode(direntry->d_inode,
1035                                         pInfo, 1 /* NewInode */);
1036 #ifdef CONFIG_CIFS_DEBUG2
1037                         cFYI(1, ("instantiated dentry %p %s to inode %p",
1038                                 direntry, direntry->d_name.name, newinode));
1039
1040                         if (newinode->i_nlink != 2)
1041                                 cFYI(1, ("unexpected number of links %d",
1042                                         newinode->i_nlink));
1043 #endif
1044                 }
1045                 kfree(pInfo);
1046                 goto mkdir_out;
1047         }
1048 mkdir_retry_old:
1049         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1050         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1051                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1052         if (rc) {
1053                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1054                 d_drop(direntry);
1055         } else {
1056 mkdir_get_info:
1057                 inc_nlink(inode);
1058                 if (pTcon->unix_ext)
1059                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1060                                                       inode->i_sb, xid);
1061                 else
1062                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1063                                                  inode->i_sb, xid, NULL);
1064
1065                 if (pTcon->nocase)
1066                         direntry->d_op = &cifs_ci_dentry_ops;
1067                 else
1068                         direntry->d_op = &cifs_dentry_ops;
1069                 d_instantiate(direntry, newinode);
1070                  /* setting nlink not necessary except in cases where we
1071                   * failed to get it from the server or was set bogus */
1072                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1073                                 direntry->d_inode->i_nlink = 2;
1074
1075                 mode &= ~current->fs->umask;
1076                 /* must turn on setgid bit if parent dir has it */
1077                 if (inode->i_mode & S_ISGID)
1078                         mode |= S_ISGID;
1079
1080                 if (pTcon->unix_ext) {
1081                         struct cifs_unix_set_info_args args = {
1082                                 .mode   = mode,
1083                                 .ctime  = NO_CHANGE_64,
1084                                 .atime  = NO_CHANGE_64,
1085                                 .mtime  = NO_CHANGE_64,
1086                                 .device = 0,
1087                         };
1088                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1089                                 args.uid = (__u64)current->fsuid;
1090                                 if (inode->i_mode & S_ISGID)
1091                                         args.gid = (__u64)inode->i_gid;
1092                                 else
1093                                         args.gid = (__u64)current->fsgid;
1094                         } else {
1095                                 args.uid = NO_CHANGE_64;
1096                                 args.gid = NO_CHANGE_64;
1097                         }
1098                         CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1099                                             cifs_sb->local_nls,
1100                                             cifs_sb->mnt_cifs_flags &
1101                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1102                 } else {
1103                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1104                             (mode & S_IWUGO) == 0) {
1105                                 FILE_BASIC_INFO pInfo;
1106                                 memset(&pInfo, 0, sizeof(pInfo));
1107                                 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
1108                                 CIFSSMBSetPathInfo(xid, pTcon, full_path,
1109                                                 &pInfo, cifs_sb->local_nls,
1110                                                 cifs_sb->mnt_cifs_flags &
1111                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1112                         }
1113                         if (direntry->d_inode) {
1114                                 if (cifs_sb->mnt_cifs_flags &
1115                                      CIFS_MOUNT_DYNPERM)
1116                                         direntry->d_inode->i_mode =
1117                                                 (mode | S_IFDIR);
1118
1119                                 if (cifs_sb->mnt_cifs_flags &
1120                                      CIFS_MOUNT_SET_UID) {
1121                                         direntry->d_inode->i_uid =
1122                                                 current->fsuid;
1123                                         if (inode->i_mode & S_ISGID)
1124                                                 direntry->d_inode->i_gid =
1125                                                         inode->i_gid;
1126                                         else
1127                                                 direntry->d_inode->i_gid =
1128                                                         current->fsgid;
1129                                 }
1130                         }
1131                 }
1132         }
1133 mkdir_out:
1134         kfree(full_path);
1135         FreeXid(xid);
1136         return rc;
1137 }
1138
1139 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1140 {
1141         int rc = 0;
1142         int xid;
1143         struct cifs_sb_info *cifs_sb;
1144         struct cifsTconInfo *pTcon;
1145         char *full_path = NULL;
1146         struct cifsInodeInfo *cifsInode;
1147
1148         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1149
1150         xid = GetXid();
1151
1152         cifs_sb = CIFS_SB(inode->i_sb);
1153         pTcon = cifs_sb->tcon;
1154
1155         full_path = build_path_from_dentry(direntry);
1156         if (full_path == NULL) {
1157                 FreeXid(xid);
1158                 return -ENOMEM;
1159         }
1160
1161         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1162                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1163
1164         if (!rc) {
1165                 drop_nlink(inode);
1166                 spin_lock(&direntry->d_inode->i_lock);
1167                 i_size_write(direntry->d_inode, 0);
1168                 clear_nlink(direntry->d_inode);
1169                 spin_unlock(&direntry->d_inode->i_lock);
1170         }
1171
1172         cifsInode = CIFS_I(direntry->d_inode);
1173         cifsInode->time = 0;    /* force revalidate to go get info when
1174                                    needed */
1175         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1176                 current_fs_time(inode->i_sb);
1177
1178         kfree(full_path);
1179         FreeXid(xid);
1180         return rc;
1181 }
1182
1183 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1184         struct inode *target_inode, struct dentry *target_direntry)
1185 {
1186         char *fromName;
1187         char *toName;
1188         struct cifs_sb_info *cifs_sb_source;
1189         struct cifs_sb_info *cifs_sb_target;
1190         struct cifsTconInfo *pTcon;
1191         int xid;
1192         int rc = 0;
1193
1194         xid = GetXid();
1195
1196         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1197         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1198         pTcon = cifs_sb_source->tcon;
1199
1200         if (pTcon != cifs_sb_target->tcon) {
1201                 FreeXid(xid);
1202                 return -EXDEV;  /* BB actually could be allowed if same server,
1203                                    but different share.
1204                                    Might eventually add support for this */
1205         }
1206
1207         /* we already  have the rename sem so we do not need to grab it again
1208            here to protect the path integrity */
1209         fromName = build_path_from_dentry(source_direntry);
1210         toName = build_path_from_dentry(target_direntry);
1211         if ((fromName == NULL) || (toName == NULL)) {
1212                 rc = -ENOMEM;
1213                 goto cifs_rename_exit;
1214         }
1215
1216         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1217                            cifs_sb_source->local_nls,
1218                            cifs_sb_source->mnt_cifs_flags &
1219                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1220         if (rc == -EEXIST) {
1221                 /* check if they are the same file because rename of hardlinked
1222                    files is a noop */
1223                 FILE_UNIX_BASIC_INFO *info_buf_source;
1224                 FILE_UNIX_BASIC_INFO *info_buf_target;
1225
1226                 info_buf_source =
1227                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1228                 if (info_buf_source != NULL) {
1229                         info_buf_target = info_buf_source + 1;
1230                         if (pTcon->unix_ext)
1231                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1232                                         info_buf_source,
1233                                         cifs_sb_source->local_nls,
1234                                         cifs_sb_source->mnt_cifs_flags &
1235                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1236                         /* else rc is still EEXIST so will fall through to
1237                            unlink the target and retry rename */
1238                         if (rc == 0) {
1239                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1240                                                 info_buf_target,
1241                                                 cifs_sb_target->local_nls,
1242                                                 /* remap based on source sb */
1243                                                 cifs_sb_source->mnt_cifs_flags &
1244                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
1245                         }
1246                         if ((rc == 0) &&
1247                             (info_buf_source->UniqueId ==
1248                              info_buf_target->UniqueId)) {
1249                         /* do not rename since the files are hardlinked which
1250                            is a noop */
1251                         } else {
1252                         /* we either can not tell the files are hardlinked
1253                            (as with Windows servers) or files are not
1254                            hardlinked so delete the target manually before
1255                            renaming to follow POSIX rather than Windows
1256                            semantics */
1257                                 cifs_unlink(target_inode, target_direntry);
1258                                 rc = CIFSSMBRename(xid, pTcon, fromName,
1259                                                    toName,
1260                                                    cifs_sb_source->local_nls,
1261                                                    cifs_sb_source->mnt_cifs_flags
1262                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
1263                         }
1264                         kfree(info_buf_source);
1265                 } /* if we can not get memory just leave rc as EEXIST */
1266         }
1267
1268         if (rc)
1269                 cFYI(1, ("rename rc %d", rc));
1270
1271         if ((rc == -EIO) || (rc == -EEXIST)) {
1272                 int oplock = 0;
1273                 __u16 netfid;
1274
1275                 /* BB FIXME Is Generic Read correct for rename? */
1276                 /* if renaming directory - we should not say CREATE_NOT_DIR,
1277                    need to test renaming open directory, also GENERIC_READ
1278                    might not right be right access to request */
1279                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1280                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
1281                                  cifs_sb_source->local_nls,
1282                                  cifs_sb_source->mnt_cifs_flags &
1283                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1284                 if (rc == 0) {
1285                         rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1286                                               cifs_sb_source->local_nls,
1287                                               cifs_sb_source->mnt_cifs_flags &
1288                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1289                         CIFSSMBClose(xid, pTcon, netfid);
1290                 }
1291         }
1292
1293 cifs_rename_exit:
1294         kfree(fromName);
1295         kfree(toName);
1296         FreeXid(xid);
1297         return rc;
1298 }
1299
1300 int cifs_revalidate(struct dentry *direntry)
1301 {
1302         int xid;
1303         int rc = 0, wbrc = 0;
1304         char *full_path;
1305         struct cifs_sb_info *cifs_sb;
1306         struct cifsInodeInfo *cifsInode;
1307         loff_t local_size;
1308         struct timespec local_mtime;
1309         bool invalidate_inode = false;
1310
1311         if (direntry->d_inode == NULL)
1312                 return -ENOENT;
1313
1314         cifsInode = CIFS_I(direntry->d_inode);
1315
1316         if (cifsInode == NULL)
1317                 return -ENOENT;
1318
1319         /* no sense revalidating inode info on file that no one can write */
1320         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1321                 return rc;
1322
1323         xid = GetXid();
1324
1325         cifs_sb = CIFS_SB(direntry->d_sb);
1326
1327         /* can not safely grab the rename sem here if rename calls revalidate
1328            since that would deadlock */
1329         full_path = build_path_from_dentry(direntry);
1330         if (full_path == NULL) {
1331                 FreeXid(xid);
1332                 return -ENOMEM;
1333         }
1334         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1335                  "jiffies %ld", full_path, direntry->d_inode,
1336                  direntry->d_inode->i_count.counter, direntry,
1337                  direntry->d_time, jiffies));
1338
1339         if (cifsInode->time == 0) {
1340                 /* was set to zero previously to force revalidate */
1341         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1342                    lookupCacheEnabled) {
1343                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1344                     (direntry->d_inode->i_nlink == 1)) {
1345                         kfree(full_path);
1346                         FreeXid(xid);
1347                         return rc;
1348                 } else {
1349                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1350                 }
1351         }
1352
1353         /* save mtime and size */
1354         local_mtime = direntry->d_inode->i_mtime;
1355         local_size = direntry->d_inode->i_size;
1356
1357         if (cifs_sb->tcon->unix_ext) {
1358                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1359                                               direntry->d_sb, xid);
1360                 if (rc) {
1361                         cFYI(1, ("error on getting revalidate info %d", rc));
1362 /*                      if (rc != -ENOENT)
1363                                 rc = 0; */      /* BB should we cache info on
1364                                                    certain errors? */
1365                 }
1366         } else {
1367                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1368                                          direntry->d_sb, xid, NULL);
1369                 if (rc) {
1370                         cFYI(1, ("error on getting revalidate info %d", rc));
1371 /*                      if (rc != -ENOENT)
1372                                 rc = 0; */      /* BB should we cache info on
1373                                                    certain errors? */
1374                 }
1375         }
1376         /* should we remap certain errors, access denied?, to zero */
1377
1378         /* if not oplocked, we invalidate inode pages if mtime or file size
1379            had changed on server */
1380
1381         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1382             (local_size == direntry->d_inode->i_size)) {
1383                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1384         } else {
1385                 /* file may have changed on server */
1386                 if (cifsInode->clientCanCacheRead) {
1387                         /* no need to invalidate inode pages since we were the
1388                            only ones who could have modified the file and the
1389                            server copy is staler than ours */
1390                 } else {
1391                         invalidate_inode = true;
1392                 }
1393         }
1394
1395         /* can not grab this sem since kernel filesys locking documentation
1396            indicates i_mutex may be taken by the kernel on lookup and rename
1397            which could deadlock if we grab the i_mutex here as well */
1398 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1399         /* need to write out dirty pages here  */
1400         if (direntry->d_inode->i_mapping) {
1401                 /* do we need to lock inode until after invalidate completes
1402                    below? */
1403                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1404                 if (wbrc)
1405                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1406         }
1407         if (invalidate_inode) {
1408         /* shrink_dcache not necessary now that cifs dentry ops
1409         are exported for negative dentries */
1410 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1411                         shrink_dcache_parent(direntry); */
1412                 if (S_ISREG(direntry->d_inode->i_mode)) {
1413                         if (direntry->d_inode->i_mapping) {
1414                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1415                                 if (wbrc)
1416                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1417                         }
1418                         /* may eventually have to do this for open files too */
1419                         if (list_empty(&(cifsInode->openFileList))) {
1420                                 /* changed on server - flush read ahead pages */
1421                                 cFYI(1, ("Invalidating read ahead data on "
1422                                          "closed file"));
1423                                 invalidate_remote_inode(direntry->d_inode);
1424                         }
1425                 }
1426         }
1427 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1428
1429         kfree(full_path);
1430         FreeXid(xid);
1431         return rc;
1432 }
1433
1434 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1435         struct kstat *stat)
1436 {
1437         int err = cifs_revalidate(dentry);
1438         if (!err) {
1439                 generic_fillattr(dentry->d_inode, stat);
1440                 stat->blksize = CIFS_MAX_MSGSIZE;
1441         }
1442         return err;
1443 }
1444
1445 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1446 {
1447         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1448         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1449         struct page *page;
1450         int rc = 0;
1451
1452         page = grab_cache_page(mapping, index);
1453         if (!page)
1454                 return -ENOMEM;
1455
1456         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1457         unlock_page(page);
1458         page_cache_release(page);
1459         return rc;
1460 }
1461
1462 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1463 {
1464         struct address_space *mapping = inode->i_mapping;
1465         unsigned long limit;
1466
1467         spin_lock(&inode->i_lock);
1468         if (inode->i_size < offset)
1469                 goto do_expand;
1470         /*
1471          * truncation of in-use swapfiles is disallowed - it would cause
1472          * subsequent swapout to scribble on the now-freed blocks.
1473          */
1474         if (IS_SWAPFILE(inode)) {
1475                 spin_unlock(&inode->i_lock);
1476                 goto out_busy;
1477         }
1478         i_size_write(inode, offset);
1479         spin_unlock(&inode->i_lock);
1480         /*
1481          * unmap_mapping_range is called twice, first simply for efficiency
1482          * so that truncate_inode_pages does fewer single-page unmaps. However
1483          * after this first call, and before truncate_inode_pages finishes,
1484          * it is possible for private pages to be COWed, which remain after
1485          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1486          * call must be made for correctness.
1487          */
1488         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1489         truncate_inode_pages(mapping, offset);
1490         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1491         goto out_truncate;
1492
1493 do_expand:
1494         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1495         if (limit != RLIM_INFINITY && offset > limit) {
1496                 spin_unlock(&inode->i_lock);
1497                 goto out_sig;
1498         }
1499         if (offset > inode->i_sb->s_maxbytes) {
1500                 spin_unlock(&inode->i_lock);
1501                 goto out_big;
1502         }
1503         i_size_write(inode, offset);
1504         spin_unlock(&inode->i_lock);
1505 out_truncate:
1506         if (inode->i_op && inode->i_op->truncate)
1507                 inode->i_op->truncate(inode);
1508         return 0;
1509 out_sig:
1510         send_sig(SIGXFSZ, current, 0);
1511 out_big:
1512         return -EFBIG;
1513 out_busy:
1514         return -ETXTBSY;
1515 }
1516
1517 static int
1518 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1519                    int xid, char *full_path)
1520 {
1521         int rc;
1522         struct cifsFileInfo *open_file;
1523         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1524         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1525         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1526
1527         /*
1528          * To avoid spurious oplock breaks from server, in the case of
1529          * inodes that we already have open, avoid doing path based
1530          * setting of file size if we can do it by handle.
1531          * This keeps our caching token (oplock) and avoids timeouts
1532          * when the local oplock break takes longer to flush
1533          * writebehind data than the SMB timeout for the SetPathInfo
1534          * request would allow
1535          */
1536         open_file = find_writable_file(cifsInode);
1537         if (open_file) {
1538                 __u16 nfid = open_file->netfid;
1539                 __u32 npid = open_file->pid;
1540                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1541                                         npid, false);
1542                 atomic_dec(&open_file->wrtPending);
1543                 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1544                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1545                         unsigned int bytes_written;
1546                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1547                                           &bytes_written, NULL, NULL, 1);
1548                         cFYI(1, ("Wrt seteof rc %d", rc));
1549                 }
1550         } else
1551                 rc = -EINVAL;
1552
1553         if (rc != 0) {
1554                 /* Set file size by pathname rather than by handle
1555                    either because no valid, writeable file handle for
1556                    it was found or because there was an error setting
1557                    it by handle */
1558                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1559                                    false, cifs_sb->local_nls,
1560                                    cifs_sb->mnt_cifs_flags &
1561                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1562                 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1563                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1564                         __u16 netfid;
1565                         int oplock = 0;
1566
1567                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1568                                 FILE_OPEN, GENERIC_WRITE,
1569                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1570                                 cifs_sb->local_nls,
1571                                 cifs_sb->mnt_cifs_flags &
1572                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1573                         if (rc == 0) {
1574                                 unsigned int bytes_written;
1575                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1576                                                   attrs->ia_size,
1577                                                   &bytes_written, NULL,
1578                                                   NULL, 1);
1579                                 cFYI(1, ("wrt seteof rc %d", rc));
1580                                 CIFSSMBClose(xid, pTcon, netfid);
1581                         }
1582                 }
1583         }
1584
1585         if (rc == 0) {
1586                 rc = cifs_vmtruncate(inode, attrs->ia_size);
1587                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1588         }
1589
1590         return rc;
1591 }
1592
1593 static int
1594 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1595 {
1596         int rc;
1597         int xid;
1598         char *full_path = NULL;
1599         struct inode *inode = direntry->d_inode;
1600         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1601         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1602         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1603         struct cifs_unix_set_info_args *args = NULL;
1604
1605         cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1606                  direntry->d_name.name, attrs->ia_valid));
1607
1608         xid = GetXid();
1609
1610         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1611                 /* check if we have permission to change attrs */
1612                 rc = inode_change_ok(inode, attrs);
1613                 if (rc < 0)
1614                         goto out;
1615                 else
1616                         rc = 0;
1617         }
1618
1619         full_path = build_path_from_dentry(direntry);
1620         if (full_path == NULL) {
1621                 rc = -ENOMEM;
1622                 goto out;
1623         }
1624
1625         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1626                 /*
1627                    Flush data before changing file size or changing the last
1628                    write time of the file on the server. If the
1629                    flush returns error, store it to report later and continue.
1630                    BB: This should be smarter. Why bother flushing pages that
1631                    will be truncated anyway? Also, should we error out here if
1632                    the flush returns error?
1633                  */
1634                 rc = filemap_write_and_wait(inode->i_mapping);
1635                 if (rc != 0) {
1636                         cifsInode->write_behind_rc = rc;
1637                         rc = 0;
1638                 }
1639         }
1640
1641         if (attrs->ia_valid & ATTR_SIZE) {
1642                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1643                 if (rc != 0)
1644                         goto out;
1645         }
1646
1647         /* skip mode change if it's just for clearing setuid/setgid */
1648         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1649                 attrs->ia_valid &= ~ATTR_MODE;
1650
1651         args = kmalloc(sizeof(*args), GFP_KERNEL);
1652         if (args == NULL) {
1653                 rc = -ENOMEM;
1654                 goto out;
1655         }
1656
1657         /* set up the struct */
1658         if (attrs->ia_valid & ATTR_MODE)
1659                 args->mode = attrs->ia_mode;
1660         else
1661                 args->mode = NO_CHANGE_64;
1662
1663         if (attrs->ia_valid & ATTR_UID)
1664                 args->uid = attrs->ia_uid;
1665         else
1666                 args->uid = NO_CHANGE_64;
1667
1668         if (attrs->ia_valid & ATTR_GID)
1669                 args->gid = attrs->ia_gid;
1670         else
1671                 args->gid = NO_CHANGE_64;
1672
1673         if (attrs->ia_valid & ATTR_ATIME)
1674                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1675         else
1676                 args->atime = NO_CHANGE_64;
1677
1678         if (attrs->ia_valid & ATTR_MTIME)
1679                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1680         else
1681                 args->mtime = NO_CHANGE_64;
1682
1683         if (attrs->ia_valid & ATTR_CTIME)
1684                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1685         else
1686                 args->ctime = NO_CHANGE_64;
1687
1688         args->device = 0;
1689         rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1690                                 cifs_sb->local_nls,
1691                                 cifs_sb->mnt_cifs_flags &
1692                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1693
1694         if (!rc)
1695                 rc = inode_setattr(inode, attrs);
1696 out:
1697         kfree(args);
1698         kfree(full_path);
1699         FreeXid(xid);
1700         return rc;
1701 }
1702
1703 static int
1704 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1705 {
1706         int xid;
1707         struct inode *inode = direntry->d_inode;
1708         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1709         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1710         char *full_path = NULL;
1711         int rc = -EACCES;
1712         __u32 dosattr = 0;
1713         __u64 mode = NO_CHANGE_64;
1714
1715         xid = GetXid();
1716
1717         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1718                  direntry->d_name.name, attrs->ia_valid));
1719
1720         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1721                 /* check if we have permission to change attrs */
1722                 rc = inode_change_ok(inode, attrs);
1723                 if (rc < 0) {
1724                         FreeXid(xid);
1725                         return rc;
1726                 } else
1727                         rc = 0;
1728         }
1729
1730         full_path = build_path_from_dentry(direntry);
1731         if (full_path == NULL) {
1732                 FreeXid(xid);
1733                 return -ENOMEM;
1734         }
1735
1736         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1737                 /*
1738                    Flush data before changing file size or changing the last
1739                    write time of the file on the server. If the
1740                    flush returns error, store it to report later and continue.
1741                    BB: This should be smarter. Why bother flushing pages that
1742                    will be truncated anyway? Also, should we error out here if
1743                    the flush returns error?
1744                  */
1745                 rc = filemap_write_and_wait(inode->i_mapping);
1746                 if (rc != 0) {
1747                         cifsInode->write_behind_rc = rc;
1748                         rc = 0;
1749                 }
1750         }
1751
1752         if (attrs->ia_valid & ATTR_SIZE) {
1753                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1754                 if (rc != 0)
1755                         goto cifs_setattr_exit;
1756         }
1757
1758         /*
1759          * Without unix extensions we can't send ownership changes to the
1760          * server, so silently ignore them. This is consistent with how
1761          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1762          * CIFSACL support + proper Windows to Unix idmapping, we may be
1763          * able to support this in the future.
1764          */
1765         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1766                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1767
1768         /* skip mode change if it's just for clearing setuid/setgid */
1769         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1770                 attrs->ia_valid &= ~ATTR_MODE;
1771
1772         if (attrs->ia_valid & ATTR_MODE) {
1773                 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1774                 mode = attrs->ia_mode;
1775         }
1776
1777         if (attrs->ia_valid & ATTR_MODE) {
1778                 rc = 0;
1779 #ifdef CONFIG_CIFS_EXPERIMENTAL
1780                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1781                         rc = mode_to_acl(inode, full_path, mode);
1782                 else
1783 #endif
1784                 if (((mode & S_IWUGO) == 0) &&
1785                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1786
1787                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1788
1789                         /* fix up mode if we're not using dynperm */
1790                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1791                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1792                 } else if ((mode & S_IWUGO) &&
1793                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
1794
1795                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1796                         /* Attributes of 0 are ignored */
1797                         if (dosattr == 0)
1798                                 dosattr |= ATTR_NORMAL;
1799
1800                         /* reset local inode permissions to normal */
1801                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1802                                 attrs->ia_mode &= ~(S_IALLUGO);
1803                                 if (S_ISDIR(inode->i_mode))
1804                                         attrs->ia_mode |=
1805                                                 cifs_sb->mnt_dir_mode;
1806                                 else
1807                                         attrs->ia_mode |=
1808                                                 cifs_sb->mnt_file_mode;
1809                         }
1810                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1811                         /* ignore mode change - ATTR_READONLY hasn't changed */
1812                         attrs->ia_valid &= ~ATTR_MODE;
1813                 }
1814         }
1815
1816         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1817             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1818                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1819                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1820
1821                 /* Even if error on time set, no sense failing the call if
1822                 the server would set the time to a reasonable value anyway,
1823                 and this check ensures that we are not being called from
1824                 sys_utimes in which case we ought to fail the call back to
1825                 the user when the server rejects the call */
1826                 if ((rc) && (attrs->ia_valid &
1827                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1828                         rc = 0;
1829         }
1830
1831         /* do not need local check to inode_check_ok since the server does
1832            that */
1833         if (!rc)
1834                 rc = inode_setattr(inode, attrs);
1835 cifs_setattr_exit:
1836         kfree(full_path);
1837         FreeXid(xid);
1838         return rc;
1839 }
1840
1841 int
1842 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1843 {
1844         struct inode *inode = direntry->d_inode;
1845         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1846         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1847
1848         if (pTcon->unix_ext)
1849                 return cifs_setattr_unix(direntry, attrs);
1850
1851         return cifs_setattr_nounix(direntry, attrs);
1852
1853         /* BB: add cifs_setattr_legacy for really old servers */
1854 }
1855
1856 #if 0
1857 void cifs_delete_inode(struct inode *inode)
1858 {
1859         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1860         /* may have to add back in if and when safe distributed caching of
1861            directories added e.g. via FindNotify */
1862 }
1863 #endif