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 int cifs_unlink(struct inode *dir, struct dentry *dentry)
 764 {
 765         int rc = 0;
 766         int xid;
 767         char *full_path = NULL;
 768         struct inode *inode = dentry->d_inode;
 769         struct cifsInodeInfo *cifsInode;
 770         struct super_block *sb = dir->i_sb;
 771         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 772         struct cifsTconInfo *tcon = cifs_sb->tcon;
 773         struct iattr *attrs;
 774         __u32 dosattr;
 775
 776         cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
 777
 778         xid = GetXid();
 779
 780         /* Unlink can be called from rename so we can not take the
 781          * sb->s_vfs_rename_mutex here */
 782         full_path = build_path_from_dentry(dentry);
 783         if (full_path == NULL) {
 784                 FreeXid(xid);
 785                 return -ENOMEM;
 786         }
 787
 788         if ((tcon->ses->capabilities & CAP_UNIX) &&
 789                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 790                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 791                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
 792                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 793                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 794                 cFYI(1, ("posix del rc %d", rc));
 795                 if ((rc == 0) || (rc == -ENOENT))
 796                         goto psx_del_no_retry;
 797         }
 798
 799         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 800                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 801 psx_del_no_retry:
 802         if (!rc) {
 803                 if (inode)
 804                         drop_nlink(inode);
 805         } else if (rc == -ENOENT) {
 806                 d_drop(dentry);
 807         } else if (rc == -ETXTBSY) {
 808                 int oplock = 0;
 809                 __u16 netfid;
 810
 811                 rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN, DELETE,
 812                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
 813                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
 814                                  cifs_sb->mnt_cifs_flags &
 815                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 816                 if (rc == 0) {
 817                         CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL,
 818                                               cifs_sb->local_nls,
 819                                               cifs_sb->mnt_cifs_flags &
 820                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 821                         CIFSSMBClose(xid, tcon, netfid);
 822                         if (inode)
 823                                 drop_nlink(inode);
 824                 }
 825         } else if (rc == -EACCES) {
 826                 /* try only if r/o attribute set in local lookup data? */
 827                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
 828                 if (attrs == NULL) {
 829                         rc = -ENOMEM;
 830                         goto out_reval;
 831                 }
 832
 833                 /* try to reset dos attributes */
 834                 cifsInode = CIFS_I(inode);
 835                 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
 836                 if (dosattr == 0)
 837                         dosattr |= ATTR_NORMAL;
 838                 dosattr |= ATTR_HIDDEN;
 839
 840                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
 841                 kfree(attrs);
 842                 if (rc != 0)
 843                         goto out_reval;
 844                 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 845                                     cifs_sb->mnt_cifs_flags &
 846                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 847                 if (rc == 0) {
 848                         if (inode)
 849                                 drop_nlink(inode);
 850                 } else if (rc == -ETXTBSY) {
 851                         int oplock = 0;
 852                         __u16 netfid;
 853
 854                         rc = CIFSSMBOpen(xid, tcon, full_path,
 855                                          FILE_OPEN, DELETE,
 856                                          CREATE_NOT_DIR |
 857                                          CREATE_DELETE_ON_CLOSE,
 858                                          &netfid, &oplock, NULL,
 859                                          cifs_sb->local_nls,
 860                                          cifs_sb->mnt_cifs_flags &
 861                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 862                         if (rc == 0) {
 863                                 CIFSSMBRenameOpenFile(xid, tcon,
 864                                         netfid, NULL,
 865                                         cifs_sb->local_nls,
 866                                         cifs_sb->mnt_cifs_flags &
 867                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 868                                 CIFSSMBClose(xid, tcon, netfid);
 869                                 if (inode)
 870                                         drop_nlink(inode);
 871                         }
 872                 /* BB if rc = -ETXTBUSY goto the rename logic BB */
 873                 }
 874         }
 875 out_reval:
 876         if (inode) {
 877                 cifsInode = CIFS_I(inode);
 878                 cifsInode->time = 0;    /* will force revalidate to get info
 879                                            when needed */
 880                 inode->i_ctime = current_fs_time(sb);
 881         }
 882         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
 883         cifsInode = CIFS_I(dir);
 884         cifsInode->time = 0;    /* force revalidate of dir as well */
 885
 886         kfree(full_path);
 887         FreeXid(xid);
 888         return rc;
 889 }
 890
 891 static void posix_fill_in_inode(struct inode *tmp_inode,
 892         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 893 {
 894         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 895         loff_t local_size;
 896         struct timespec local_mtime;
 897
 898         cifsInfo->time = jiffies;
 899         atomic_inc(&cifsInfo->inUse);
 900
 901         /* save mtime and size */
 902         local_mtime = tmp_inode->i_mtime;
 903         local_size  = tmp_inode->i_size;
 904
 905         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 906         cifs_set_ops(tmp_inode, false);
 907
 908         if (!S_ISREG(tmp_inode->i_mode))
 909                 return;
 910
 911         /*
 912          * No sense invalidating pages for new inode
 913          * since we we have not started caching
 914          * readahead file data yet.
 915          */
 916         if (isNewInode)
 917                 return;
 918
 919         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 920                 (local_size == tmp_inode->i_size)) {
 921                 cFYI(1, ("inode exists but unchanged"));
 922         } else {
 923                 /* file may have changed on server */
 924                 cFYI(1, ("invalidate inode, readdir detected change"));
 925                 invalidate_remote_inode(tmp_inode);
 926         }
 927 }
 928
 929 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 930 {
 931         int rc = 0;
 932         int xid;
 933         struct cifs_sb_info *cifs_sb;
 934         struct cifsTconInfo *pTcon;
 935         char *full_path = NULL;
 936         struct inode *newinode = NULL;
 937
 938         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 939
 940         xid = GetXid();
 941
 942         cifs_sb = CIFS_SB(inode->i_sb);
 943         pTcon = cifs_sb->tcon;
 944
 945         full_path = build_path_from_dentry(direntry);
 946         if (full_path == NULL) {
 947                 FreeXid(xid);
 948                 return -ENOMEM;
 949         }
 950
 951         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 952                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 953                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 954                 u32 oplock = 0;
 955                 FILE_UNIX_BASIC_INFO *pInfo =
 956                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 957                 if (pInfo == NULL) {
 958                         rc = -ENOMEM;
 959                         goto mkdir_out;
 960                 }
 961
 962                 mode &= ~current->fs->umask;
 963                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
 964                                 mode, NULL /* netfid */, pInfo, &oplock,
 965                                 full_path, cifs_sb->local_nls,
 966                                 cifs_sb->mnt_cifs_flags &
 967                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 968                 if (rc == -EOPNOTSUPP) {
 969                         kfree(pInfo);
 970                         goto mkdir_retry_old;
 971                 } else if (rc) {
 972                         cFYI(1, ("posix mkdir returned 0x%x", rc));
 973                         d_drop(direntry);
 974                 } else {
 975                         if (pInfo->Type == cpu_to_le32(-1)) {
 976                                 /* no return info, go query for it */
 977                                 kfree(pInfo);
 978                                 goto mkdir_get_info;
 979                         }
 980 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
 981         to set uid/gid */
 982                         inc_nlink(inode);
 983                         if (pTcon->nocase)
 984                                 direntry->d_op = &cifs_ci_dentry_ops;
 985                         else
 986                                 direntry->d_op = &cifs_dentry_ops;
 987
 988                         newinode = new_inode(inode->i_sb);
 989                         if (newinode == NULL) {
 990                                 kfree(pInfo);
 991                                 goto mkdir_get_info;
 992                         }
 993                         /* Is an i_ino of zero legal? */
 994                         /* Are there sanity checks we can use to ensure that
 995                            the server is really filling in that field? */
 996                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 997                                 newinode->i_ino =
 998                                         (unsigned long)pInfo->UniqueId;
 999                         } /* note ino incremented to unique num in new_inode */
1000                         if (inode->i_sb->s_flags & MS_NOATIME)
1001                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
1002                         newinode->i_nlink = 2;
1003
1004                         insert_inode_hash(newinode);
1005                         d_instantiate(direntry, newinode);
1006
1007                         /* we already checked in POSIXCreate whether
1008                            frame was long enough */
1009                         posix_fill_in_inode(direntry->d_inode,
1010                                         pInfo, 1 /* NewInode */);
1011 #ifdef CONFIG_CIFS_DEBUG2
1012                         cFYI(1, ("instantiated dentry %p %s to inode %p",
1013                                 direntry, direntry->d_name.name, newinode));
1014
1015                         if (newinode->i_nlink != 2)
1016                                 cFYI(1, ("unexpected number of links %d",
1017                                         newinode->i_nlink));
1018 #endif
1019                 }
1020                 kfree(pInfo);
1021                 goto mkdir_out;
1022         }
1023 mkdir_retry_old:
1024         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1025         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1026                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1027         if (rc) {
1028                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1029                 d_drop(direntry);
1030         } else {
1031 mkdir_get_info:
1032                 inc_nlink(inode);
1033                 if (pTcon->unix_ext)
1034                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1035                                                       inode->i_sb, xid);
1036                 else
1037                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1038                                                  inode->i_sb, xid, NULL);
1039
1040                 if (pTcon->nocase)
1041                         direntry->d_op = &cifs_ci_dentry_ops;
1042                 else
1043                         direntry->d_op = &cifs_dentry_ops;
1044                 d_instantiate(direntry, newinode);
1045                  /* setting nlink not necessary except in cases where we
1046                   * failed to get it from the server or was set bogus */
1047                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1048                                 direntry->d_inode->i_nlink = 2;
1049
1050                 mode &= ~current->fs->umask;
1051                 /* must turn on setgid bit if parent dir has it */
1052                 if (inode->i_mode & S_ISGID)
1053                         mode |= S_ISGID;
1054
1055                 if (pTcon->unix_ext) {
1056                         struct cifs_unix_set_info_args args = {
1057                                 .mode   = mode,
1058                                 .ctime  = NO_CHANGE_64,
1059                                 .atime  = NO_CHANGE_64,
1060                                 .mtime  = NO_CHANGE_64,
1061                                 .device = 0,
1062                         };
1063                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1064                                 args.uid = (__u64)current->fsuid;
1065                                 if (inode->i_mode & S_ISGID)
1066                                         args.gid = (__u64)inode->i_gid;
1067                                 else
1068                                         args.gid = (__u64)current->fsgid;
1069                         } else {
1070                                 args.uid = NO_CHANGE_64;
1071                                 args.gid = NO_CHANGE_64;
1072                         }
1073                         CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1074                                             cifs_sb->local_nls,
1075                                             cifs_sb->mnt_cifs_flags &
1076                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1077                 } else {
1078                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1079                             (mode & S_IWUGO) == 0) {
1080                                 FILE_BASIC_INFO pInfo;
1081                                 memset(&pInfo, 0, sizeof(pInfo));
1082                                 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
1083                                 CIFSSMBSetPathInfo(xid, pTcon, full_path,
1084                                                 &pInfo, cifs_sb->local_nls,
1085                                                 cifs_sb->mnt_cifs_flags &
1086                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1087                         }
1088                         if (direntry->d_inode) {
1089                                 if (cifs_sb->mnt_cifs_flags &
1090                                      CIFS_MOUNT_DYNPERM)
1091                                         direntry->d_inode->i_mode =
1092                                                 (mode | S_IFDIR);
1093
1094                                 if (cifs_sb->mnt_cifs_flags &
1095                                      CIFS_MOUNT_SET_UID) {
1096                                         direntry->d_inode->i_uid =
1097                                                 current->fsuid;
1098                                         if (inode->i_mode & S_ISGID)
1099                                                 direntry->d_inode->i_gid =
1100                                                         inode->i_gid;
1101                                         else
1102                                                 direntry->d_inode->i_gid =
1103                                                         current->fsgid;
1104                                 }
1105                         }
1106                 }
1107         }
1108 mkdir_out:
1109         kfree(full_path);
1110         FreeXid(xid);
1111         return rc;
1112 }
1113
1114 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1115 {
1116         int rc = 0;
1117         int xid;
1118         struct cifs_sb_info *cifs_sb;
1119         struct cifsTconInfo *pTcon;
1120         char *full_path = NULL;
1121         struct cifsInodeInfo *cifsInode;
1122
1123         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1124
1125         xid = GetXid();
1126
1127         cifs_sb = CIFS_SB(inode->i_sb);
1128         pTcon = cifs_sb->tcon;
1129
1130         full_path = build_path_from_dentry(direntry);
1131         if (full_path == NULL) {
1132                 FreeXid(xid);
1133                 return -ENOMEM;
1134         }
1135
1136         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1137                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1138
1139         if (!rc) {
1140                 drop_nlink(inode);
1141                 spin_lock(&direntry->d_inode->i_lock);
1142                 i_size_write(direntry->d_inode, 0);
1143                 clear_nlink(direntry->d_inode);
1144                 spin_unlock(&direntry->d_inode->i_lock);
1145         }
1146
1147         cifsInode = CIFS_I(direntry->d_inode);
1148         cifsInode->time = 0;    /* force revalidate to go get info when
1149                                    needed */
1150         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1151                 current_fs_time(inode->i_sb);
1152
1153         kfree(full_path);
1154         FreeXid(xid);
1155         return rc;
1156 }
1157
1158 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1159         struct inode *target_inode, struct dentry *target_direntry)
1160 {
1161         char *fromName;
1162         char *toName;
1163         struct cifs_sb_info *cifs_sb_source;
1164         struct cifs_sb_info *cifs_sb_target;
1165         struct cifsTconInfo *pTcon;
1166         int xid;
1167         int rc = 0;
1168
1169         xid = GetXid();
1170
1171         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1172         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1173         pTcon = cifs_sb_source->tcon;
1174
1175         if (pTcon != cifs_sb_target->tcon) {
1176                 FreeXid(xid);
1177                 return -EXDEV;  /* BB actually could be allowed if same server,
1178                                    but different share.
1179                                    Might eventually add support for this */
1180         }
1181
1182         /* we already  have the rename sem so we do not need to grab it again
1183            here to protect the path integrity */
1184         fromName = build_path_from_dentry(source_direntry);
1185         toName = build_path_from_dentry(target_direntry);
1186         if ((fromName == NULL) || (toName == NULL)) {
1187                 rc = -ENOMEM;
1188                 goto cifs_rename_exit;
1189         }
1190
1191         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1192                            cifs_sb_source->local_nls,
1193                            cifs_sb_source->mnt_cifs_flags &
1194                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1195         if (rc == -EEXIST) {
1196                 /* check if they are the same file because rename of hardlinked
1197                    files is a noop */
1198                 FILE_UNIX_BASIC_INFO *info_buf_source;
1199                 FILE_UNIX_BASIC_INFO *info_buf_target;
1200
1201                 info_buf_source =
1202                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1203                 if (info_buf_source != NULL) {
1204                         info_buf_target = info_buf_source + 1;
1205                         if (pTcon->unix_ext)
1206                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1207                                         info_buf_source,
1208                                         cifs_sb_source->local_nls,
1209                                         cifs_sb_source->mnt_cifs_flags &
1210                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1211                         /* else rc is still EEXIST so will fall through to
1212                            unlink the target and retry rename */
1213                         if (rc == 0) {
1214                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1215                                                 info_buf_target,
1216                                                 cifs_sb_target->local_nls,
1217                                                 /* remap based on source sb */
1218                                                 cifs_sb_source->mnt_cifs_flags &
1219                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
1220                         }
1221                         if ((rc == 0) &&
1222                             (info_buf_source->UniqueId ==
1223                              info_buf_target->UniqueId)) {
1224                         /* do not rename since the files are hardlinked which
1225                            is a noop */
1226                         } else {
1227                         /* we either can not tell the files are hardlinked
1228                            (as with Windows servers) or files are not
1229                            hardlinked so delete the target manually before
1230                            renaming to follow POSIX rather than Windows
1231                            semantics */
1232                                 cifs_unlink(target_inode, target_direntry);
1233                                 rc = CIFSSMBRename(xid, pTcon, fromName,
1234                                                    toName,
1235                                                    cifs_sb_source->local_nls,
1236                                                    cifs_sb_source->mnt_cifs_flags
1237                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
1238                         }
1239                         kfree(info_buf_source);
1240                 } /* if we can not get memory just leave rc as EEXIST */
1241         }
1242
1243         if (rc)
1244                 cFYI(1, ("rename rc %d", rc));
1245
1246         if ((rc == -EIO) || (rc == -EEXIST)) {
1247                 int oplock = 0;
1248                 __u16 netfid;
1249
1250                 /* BB FIXME Is Generic Read correct for rename? */
1251                 /* if renaming directory - we should not say CREATE_NOT_DIR,
1252                    need to test renaming open directory, also GENERIC_READ
1253                    might not right be right access to request */
1254                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1255                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
1256                                  cifs_sb_source->local_nls,
1257                                  cifs_sb_source->mnt_cifs_flags &
1258                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1259                 if (rc == 0) {
1260                         rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1261                                               cifs_sb_source->local_nls,
1262                                               cifs_sb_source->mnt_cifs_flags &
1263                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1264                         CIFSSMBClose(xid, pTcon, netfid);
1265                 }
1266         }
1267
1268 cifs_rename_exit:
1269         kfree(fromName);
1270         kfree(toName);
1271         FreeXid(xid);
1272         return rc;
1273 }
1274
1275 int cifs_revalidate(struct dentry *direntry)
1276 {
1277         int xid;
1278         int rc = 0, wbrc = 0;
1279         char *full_path;
1280         struct cifs_sb_info *cifs_sb;
1281         struct cifsInodeInfo *cifsInode;
1282         loff_t local_size;
1283         struct timespec local_mtime;
1284         bool invalidate_inode = false;
1285
1286         if (direntry->d_inode == NULL)
1287                 return -ENOENT;
1288
1289         cifsInode = CIFS_I(direntry->d_inode);
1290
1291         if (cifsInode == NULL)
1292                 return -ENOENT;
1293
1294         /* no sense revalidating inode info on file that no one can write */
1295         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1296                 return rc;
1297
1298         xid = GetXid();
1299
1300         cifs_sb = CIFS_SB(direntry->d_sb);
1301
1302         /* can not safely grab the rename sem here if rename calls revalidate
1303            since that would deadlock */
1304         full_path = build_path_from_dentry(direntry);
1305         if (full_path == NULL) {
1306                 FreeXid(xid);
1307                 return -ENOMEM;
1308         }
1309         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1310                  "jiffies %ld", full_path, direntry->d_inode,
1311                  direntry->d_inode->i_count.counter, direntry,
1312                  direntry->d_time, jiffies));
1313
1314         if (cifsInode->time == 0) {
1315                 /* was set to zero previously to force revalidate */
1316         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1317                    lookupCacheEnabled) {
1318                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1319                     (direntry->d_inode->i_nlink == 1)) {
1320                         kfree(full_path);
1321                         FreeXid(xid);
1322                         return rc;
1323                 } else {
1324                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1325                 }
1326         }
1327
1328         /* save mtime and size */
1329         local_mtime = direntry->d_inode->i_mtime;
1330         local_size = direntry->d_inode->i_size;
1331
1332         if (cifs_sb->tcon->unix_ext) {
1333                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1334                                               direntry->d_sb, xid);
1335                 if (rc) {
1336                         cFYI(1, ("error on getting revalidate info %d", rc));
1337 /*                      if (rc != -ENOENT)
1338                                 rc = 0; */      /* BB should we cache info on
1339                                                    certain errors? */
1340                 }
1341         } else {
1342                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1343                                          direntry->d_sb, xid, NULL);
1344                 if (rc) {
1345                         cFYI(1, ("error on getting revalidate info %d", rc));
1346 /*                      if (rc != -ENOENT)
1347                                 rc = 0; */      /* BB should we cache info on
1348                                                    certain errors? */
1349                 }
1350         }
1351         /* should we remap certain errors, access denied?, to zero */
1352
1353         /* if not oplocked, we invalidate inode pages if mtime or file size
1354            had changed on server */
1355
1356         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1357             (local_size == direntry->d_inode->i_size)) {
1358                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1359         } else {
1360                 /* file may have changed on server */
1361                 if (cifsInode->clientCanCacheRead) {
1362                         /* no need to invalidate inode pages since we were the
1363                            only ones who could have modified the file and the
1364                            server copy is staler than ours */
1365                 } else {
1366                         invalidate_inode = true;
1367                 }
1368         }
1369
1370         /* can not grab this sem since kernel filesys locking documentation
1371            indicates i_mutex may be taken by the kernel on lookup and rename
1372            which could deadlock if we grab the i_mutex here as well */
1373 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1374         /* need to write out dirty pages here  */
1375         if (direntry->d_inode->i_mapping) {
1376                 /* do we need to lock inode until after invalidate completes
1377                    below? */
1378                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1379                 if (wbrc)
1380                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1381         }
1382         if (invalidate_inode) {
1383         /* shrink_dcache not necessary now that cifs dentry ops
1384         are exported for negative dentries */
1385 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1386                         shrink_dcache_parent(direntry); */
1387                 if (S_ISREG(direntry->d_inode->i_mode)) {
1388                         if (direntry->d_inode->i_mapping) {
1389                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1390                                 if (wbrc)
1391                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1392                         }
1393                         /* may eventually have to do this for open files too */
1394                         if (list_empty(&(cifsInode->openFileList))) {
1395                                 /* changed on server - flush read ahead pages */
1396                                 cFYI(1, ("Invalidating read ahead data on "
1397                                          "closed file"));
1398                                 invalidate_remote_inode(direntry->d_inode);
1399                         }
1400                 }
1401         }
1402 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1403
1404         kfree(full_path);
1405         FreeXid(xid);
1406         return rc;
1407 }
1408
1409 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1410         struct kstat *stat)
1411 {
1412         int err = cifs_revalidate(dentry);
1413         if (!err) {
1414                 generic_fillattr(dentry->d_inode, stat);
1415                 stat->blksize = CIFS_MAX_MSGSIZE;
1416         }
1417         return err;
1418 }
1419
1420 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1421 {
1422         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1423         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1424         struct page *page;
1425         int rc = 0;
1426
1427         page = grab_cache_page(mapping, index);
1428         if (!page)
1429                 return -ENOMEM;
1430
1431         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1432         unlock_page(page);
1433         page_cache_release(page);
1434         return rc;
1435 }
1436
1437 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1438 {
1439         struct address_space *mapping = inode->i_mapping;
1440         unsigned long limit;
1441
1442         spin_lock(&inode->i_lock);
1443         if (inode->i_size < offset)
1444                 goto do_expand;
1445         /*
1446          * truncation of in-use swapfiles is disallowed - it would cause
1447          * subsequent swapout to scribble on the now-freed blocks.
1448          */
1449         if (IS_SWAPFILE(inode)) {
1450                 spin_unlock(&inode->i_lock);
1451                 goto out_busy;
1452         }
1453         i_size_write(inode, offset);
1454         spin_unlock(&inode->i_lock);
1455         /*
1456          * unmap_mapping_range is called twice, first simply for efficiency
1457          * so that truncate_inode_pages does fewer single-page unmaps. However
1458          * after this first call, and before truncate_inode_pages finishes,
1459          * it is possible for private pages to be COWed, which remain after
1460          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1461          * call must be made for correctness.
1462          */
1463         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1464         truncate_inode_pages(mapping, offset);
1465         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1466         goto out_truncate;
1467
1468 do_expand:
1469         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1470         if (limit != RLIM_INFINITY && offset > limit) {
1471                 spin_unlock(&inode->i_lock);
1472                 goto out_sig;
1473         }
1474         if (offset > inode->i_sb->s_maxbytes) {
1475                 spin_unlock(&inode->i_lock);
1476                 goto out_big;
1477         }
1478         i_size_write(inode, offset);
1479         spin_unlock(&inode->i_lock);
1480 out_truncate:
1481         if (inode->i_op && inode->i_op->truncate)
1482                 inode->i_op->truncate(inode);
1483         return 0;
1484 out_sig:
1485         send_sig(SIGXFSZ, current, 0);
1486 out_big:
1487         return -EFBIG;
1488 out_busy:
1489         return -ETXTBSY;
1490 }
1491
1492 static int
1493 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1494                    int xid, char *full_path)
1495 {
1496         int rc;
1497         struct cifsFileInfo *open_file;
1498         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1499         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1500         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1501
1502         /*
1503          * To avoid spurious oplock breaks from server, in the case of
1504          * inodes that we already have open, avoid doing path based
1505          * setting of file size if we can do it by handle.
1506          * This keeps our caching token (oplock) and avoids timeouts
1507          * when the local oplock break takes longer to flush
1508          * writebehind data than the SMB timeout for the SetPathInfo
1509          * request would allow
1510          */
1511         open_file = find_writable_file(cifsInode);
1512         if (open_file) {
1513                 __u16 nfid = open_file->netfid;
1514                 __u32 npid = open_file->pid;
1515                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1516                                         npid, false);
1517                 atomic_dec(&open_file->wrtPending);
1518                 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1519                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1520                         unsigned int bytes_written;
1521                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1522                                           &bytes_written, NULL, NULL, 1);
1523                         cFYI(1, ("Wrt seteof rc %d", rc));
1524                 }
1525         } else
1526                 rc = -EINVAL;
1527
1528         if (rc != 0) {
1529                 /* Set file size by pathname rather than by handle
1530                    either because no valid, writeable file handle for
1531                    it was found or because there was an error setting
1532                    it by handle */
1533                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1534                                    false, cifs_sb->local_nls,
1535                                    cifs_sb->mnt_cifs_flags &
1536                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1537                 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1538                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1539                         __u16 netfid;
1540                         int oplock = 0;
1541
1542                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1543                                 FILE_OPEN, GENERIC_WRITE,
1544                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1545                                 cifs_sb->local_nls,
1546                                 cifs_sb->mnt_cifs_flags &
1547                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1548                         if (rc == 0) {
1549                                 unsigned int bytes_written;
1550                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1551                                                   attrs->ia_size,
1552                                                   &bytes_written, NULL,
1553                                                   NULL, 1);
1554                                 cFYI(1, ("wrt seteof rc %d", rc));
1555                                 CIFSSMBClose(xid, pTcon, netfid);
1556                         }
1557                 }
1558         }
1559
1560         if (rc == 0) {
1561                 rc = cifs_vmtruncate(inode, attrs->ia_size);
1562                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1563         }
1564
1565         return rc;
1566 }
1567
1568 static int
1569 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1570 {
1571         int rc;
1572         int xid;
1573         char *full_path = NULL;
1574         struct inode *inode = direntry->d_inode;
1575         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1576         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1577         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1578         struct cifs_unix_set_info_args *args = NULL;
1579
1580         cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1581                  direntry->d_name.name, attrs->ia_valid));
1582
1583         xid = GetXid();
1584
1585         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1586                 /* check if we have permission to change attrs */
1587                 rc = inode_change_ok(inode, attrs);
1588                 if (rc < 0)
1589                         goto out;
1590                 else
1591                         rc = 0;
1592         }
1593
1594         full_path = build_path_from_dentry(direntry);
1595         if (full_path == NULL) {
1596                 rc = -ENOMEM;
1597                 goto out;
1598         }
1599
1600         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1601                 /*
1602                    Flush data before changing file size or changing the last
1603                    write time of the file on the server. If the
1604                    flush returns error, store it to report later and continue.
1605                    BB: This should be smarter. Why bother flushing pages that
1606                    will be truncated anyway? Also, should we error out here if
1607                    the flush returns error?
1608                  */
1609                 rc = filemap_write_and_wait(inode->i_mapping);
1610                 if (rc != 0) {
1611                         cifsInode->write_behind_rc = rc;
1612                         rc = 0;
1613                 }
1614         }
1615
1616         if (attrs->ia_valid & ATTR_SIZE) {
1617                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1618                 if (rc != 0)
1619                         goto out;
1620         }
1621
1622         /* skip mode change if it's just for clearing setuid/setgid */
1623         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1624                 attrs->ia_valid &= ~ATTR_MODE;
1625
1626         args = kmalloc(sizeof(*args), GFP_KERNEL);
1627         if (args == NULL) {
1628                 rc = -ENOMEM;
1629                 goto out;
1630         }
1631
1632         /* set up the struct */
1633         if (attrs->ia_valid & ATTR_MODE)
1634                 args->mode = attrs->ia_mode;
1635         else
1636                 args->mode = NO_CHANGE_64;
1637
1638         if (attrs->ia_valid & ATTR_UID)
1639                 args->uid = attrs->ia_uid;
1640         else
1641                 args->uid = NO_CHANGE_64;
1642
1643         if (attrs->ia_valid & ATTR_GID)
1644                 args->gid = attrs->ia_gid;
1645         else
1646                 args->gid = NO_CHANGE_64;
1647
1648         if (attrs->ia_valid & ATTR_ATIME)
1649                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1650         else
1651                 args->atime = NO_CHANGE_64;
1652
1653         if (attrs->ia_valid & ATTR_MTIME)
1654                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1655         else
1656                 args->mtime = NO_CHANGE_64;
1657
1658         if (attrs->ia_valid & ATTR_CTIME)
1659                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1660         else
1661                 args->ctime = NO_CHANGE_64;
1662
1663         args->device = 0;
1664         rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1665                                 cifs_sb->local_nls,
1666                                 cifs_sb->mnt_cifs_flags &
1667                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1668
1669         if (!rc)
1670                 rc = inode_setattr(inode, attrs);
1671 out:
1672         kfree(args);
1673         kfree(full_path);
1674         FreeXid(xid);
1675         return rc;
1676 }
1677
1678 static int
1679 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1680 {
1681         int xid;
1682         struct inode *inode = direntry->d_inode;
1683         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1684         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1685         char *full_path = NULL;
1686         int rc = -EACCES;
1687         __u32 dosattr = 0;
1688         __u64 mode = NO_CHANGE_64;
1689
1690         xid = GetXid();
1691
1692         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1693                  direntry->d_name.name, attrs->ia_valid));
1694
1695         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1696                 /* check if we have permission to change attrs */
1697                 rc = inode_change_ok(inode, attrs);
1698                 if (rc < 0) {
1699                         FreeXid(xid);
1700                         return rc;
1701                 } else
1702                         rc = 0;
1703         }
1704
1705         full_path = build_path_from_dentry(direntry);
1706         if (full_path == NULL) {
1707                 FreeXid(xid);
1708                 return -ENOMEM;
1709         }
1710
1711         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1712                 /*
1713                    Flush data before changing file size or changing the last
1714                    write time of the file on the server. If the
1715                    flush returns error, store it to report later and continue.
1716                    BB: This should be smarter. Why bother flushing pages that
1717                    will be truncated anyway? Also, should we error out here if
1718                    the flush returns error?
1719                  */
1720                 rc = filemap_write_and_wait(inode->i_mapping);
1721                 if (rc != 0) {
1722                         cifsInode->write_behind_rc = rc;
1723                         rc = 0;
1724                 }
1725         }
1726
1727         if (attrs->ia_valid & ATTR_SIZE) {
1728                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1729                 if (rc != 0)
1730                         goto cifs_setattr_exit;
1731         }
1732
1733         /*
1734          * Without unix extensions we can't send ownership changes to the
1735          * server, so silently ignore them. This is consistent with how
1736          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1737          * CIFSACL support + proper Windows to Unix idmapping, we may be
1738          * able to support this in the future.
1739          */
1740         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1741                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1742
1743         /* skip mode change if it's just for clearing setuid/setgid */
1744         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1745                 attrs->ia_valid &= ~ATTR_MODE;
1746
1747         if (attrs->ia_valid & ATTR_MODE) {
1748                 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1749                 mode = attrs->ia_mode;
1750         }
1751
1752         if (attrs->ia_valid & ATTR_MODE) {
1753                 rc = 0;
1754 #ifdef CONFIG_CIFS_EXPERIMENTAL
1755                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1756                         rc = mode_to_acl(inode, full_path, mode);
1757                 else
1758 #endif
1759                 if (((mode & S_IWUGO) == 0) &&
1760                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1761
1762                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1763
1764                         /* fix up mode if we're not using dynperm */
1765                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1766                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1767                 } else if ((mode & S_IWUGO) &&
1768                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
1769
1770                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1771                         /* Attributes of 0 are ignored */
1772                         if (dosattr == 0)
1773                                 dosattr |= ATTR_NORMAL;
1774
1775                         /* reset local inode permissions to normal */
1776                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1777                                 attrs->ia_mode &= ~(S_IALLUGO);
1778                                 if (S_ISDIR(inode->i_mode))
1779                                         attrs->ia_mode |=
1780                                                 cifs_sb->mnt_dir_mode;
1781                                 else
1782                                         attrs->ia_mode |=
1783                                                 cifs_sb->mnt_file_mode;
1784                         }
1785                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1786                         /* ignore mode change - ATTR_READONLY hasn't changed */
1787                         attrs->ia_valid &= ~ATTR_MODE;
1788                 }
1789         }
1790
1791         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1792             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1793                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1794                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1795
1796                 /* Even if error on time set, no sense failing the call if
1797                 the server would set the time to a reasonable value anyway,
1798                 and this check ensures that we are not being called from
1799                 sys_utimes in which case we ought to fail the call back to
1800                 the user when the server rejects the call */
1801                 if ((rc) && (attrs->ia_valid &
1802                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1803                         rc = 0;
1804         }
1805
1806         /* do not need local check to inode_check_ok since the server does
1807            that */
1808         if (!rc)
1809                 rc = inode_setattr(inode, attrs);
1810 cifs_setattr_exit:
1811         kfree(full_path);
1812         FreeXid(xid);
1813         return rc;
1814 }
1815
1816 int
1817 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1818 {
1819         struct inode *inode = direntry->d_inode;
1820         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1821         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1822
1823         if (pTcon->unix_ext)
1824                 return cifs_setattr_unix(direntry, attrs);
1825
1826         return cifs_setattr_nounix(direntry, attrs);
1827
1828         /* BB: add cifs_setattr_legacy for really old servers */
1829 }
1830
1831 #if 0
1832 void cifs_delete_inode(struct inode *inode)
1833 {
1834         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1835         /* may have to add back in if and when safe distributed caching of
1836            directories added e.g. via FindNotify */
1837 }
1838 #endif