fs/cifs/inode.c

   1 /*
   2  *   fs/cifs/inode.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2007
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21 #include <linux/fs.h>
  22 #include <linux/stat.h>
  23 #include <linux/pagemap.h>
  24 #include <asm/div64.h>
  25 #include "cifsfs.h"
  26 #include "cifspdu.h"
  27 #include "cifsglob.h"
  28 #include "cifsproto.h"
  29 #include "cifs_debug.h"
  30 #include "cifs_fs_sb.h"
  31
  32
  33 static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
  34 {
  35         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  36
  37         switch (inode->i_mode & S_IFMT) {
  38         case S_IFREG:
  39                 inode->i_op = &cifs_file_inode_ops;
  40                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
  41                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  42                                 inode->i_fop = &cifs_file_direct_nobrl_ops;
  43                         else
  44                                 inode->i_fop = &cifs_file_direct_ops;
  45                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  46                         inode->i_fop = &cifs_file_nobrl_ops;
  47                 else { /* not direct, send byte range locks */
  48                         inode->i_fop = &cifs_file_ops;
  49                 }
  50
  51
  52                 /* check if server can support readpages */
  53                 if (cifs_sb->tcon->ses->server->maxBuf <
  54                                 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
  55                         inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
  56                 else
  57                         inode->i_data.a_ops = &cifs_addr_ops;
  58                 break;
  59         case S_IFDIR:
  60 #ifdef CONFIG_CIFS_DFS_UPCALL
  61                 if (is_dfs_referral) {
  62                         inode->i_op = &cifs_dfs_referral_inode_operations;
  63                 } else {
  64 #else /* NO DFS support, treat as a directory */
  65                 {
  66 #endif
  67                         inode->i_op = &cifs_dir_inode_ops;
  68                         inode->i_fop = &cifs_dir_ops;
  69                 }
  70                 break;
  71         case S_IFLNK:
  72                 inode->i_op = &cifs_symlink_inode_ops;
  73                 break;
  74         default:
  75                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  76                 break;
  77         }
  78 }
  79
  80 static void cifs_unix_info_to_inode(struct inode *inode,
  81                 FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
  82 {
  83         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  84         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
  85         __u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
  86         __u64 end_of_file = le64_to_cpu(info->EndOfFile);
  87
  88         inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(info->LastAccessTime));
  89         inode->i_mtime =
  90                 cifs_NTtimeToUnix(le64_to_cpu(info->LastModificationTime));
  91         inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(info->LastStatusChange));
  92         inode->i_mode = le64_to_cpu(info->Permissions);
  93
  94         /*
  95          * Since we set the inode type below we need to mask off
  96          * to avoid strange results if bits set above.
  97          */
  98         inode->i_mode &= ~S_IFMT;
  99         switch (le32_to_cpu(info->Type)) {
 100         case UNIX_FILE:
 101                 inode->i_mode |= S_IFREG;
 102                 break;
 103         case UNIX_SYMLINK:
 104                 inode->i_mode |= S_IFLNK;
 105                 break;
 106         case UNIX_DIR:
 107                 inode->i_mode |= S_IFDIR;
 108                 break;
 109         case UNIX_CHARDEV:
 110                 inode->i_mode |= S_IFCHR;
 111                 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 112                                       le64_to_cpu(info->DevMinor) & MINORMASK);
 113                 break;
 114         case UNIX_BLOCKDEV:
 115                 inode->i_mode |= S_IFBLK;
 116                 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 117                                       le64_to_cpu(info->DevMinor) & MINORMASK);
 118                 break;
 119         case UNIX_FIFO:
 120                 inode->i_mode |= S_IFIFO;
 121                 break;
 122         case UNIX_SOCKET:
 123                 inode->i_mode |= S_IFSOCK;
 124                 break;
 125         default:
 126                 /* safest to call it a file if we do not know */
 127                 inode->i_mode |= S_IFREG;
 128                 cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
 129                 break;
 130         }
 131
 132         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
 133             !force_uid_gid)
 134                 inode->i_uid = cifs_sb->mnt_uid;
 135         else
 136                 inode->i_uid = le64_to_cpu(info->Uid);
 137
 138         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
 139             !force_uid_gid)
 140                 inode->i_gid = cifs_sb->mnt_gid;
 141         else
 142                 inode->i_gid = le64_to_cpu(info->Gid);
 143
 144         inode->i_nlink = le64_to_cpu(info->Nlinks);
 145
 146         spin_lock(&inode->i_lock);
 147         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 148                 /*
 149                  * We can not safely change the file size here if the client
 150                  * is writing to it due to potential races.
 151                  */
 152                 i_size_write(inode, end_of_file);
 153
 154                 /*
 155                  * i_blocks is not related to (i_size / i_blksize),
 156                  * but instead 512 byte (2**9) size is required for
 157                  * calculating num blocks.
 158                  */
 159                 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 160         }
 161         spin_unlock(&inode->i_lock);
 162 }
 163
 164
 165 /*
 166  *      Needed to setup inode data for the directory which is the
 167  *      junction to the new submount (ie to setup the fake directory
 168  *      which represents a DFS referral)
 169  */
 170 static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
 171                                struct super_block *sb)
 172 {
 173         struct inode *pinode = NULL;
 174
 175         memset(pfnd_dat, 0, sizeof(FILE_UNIX_BASIC_INFO));
 176
 177 /*      __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
 178         __le64 pfnd_dat->NumOfBytes = cpu_to_le64(0);
 179         __u64 UniqueId = 0;  */
 180         pfnd_dat->LastStatusChange =
 181                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 182         pfnd_dat->LastAccessTime =
 183                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 184         pfnd_dat->LastModificationTime =
 185                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 186         pfnd_dat->Type = cpu_to_le32(UNIX_DIR);
 187         pfnd_dat->Permissions = cpu_to_le64(S_IXUGO | S_IRWXU);
 188         pfnd_dat->Nlinks = cpu_to_le64(2);
 189         if (sb->s_root)
 190                 pinode = sb->s_root->d_inode;
 191         if (pinode == NULL)
 192                 return;
 193
 194         /* fill in default values for the remaining based on root
 195            inode since we can not query the server for this inode info */
 196         pfnd_dat->DevMajor = cpu_to_le64(MAJOR(pinode->i_rdev));
 197         pfnd_dat->DevMinor = cpu_to_le64(MINOR(pinode->i_rdev));
 198         pfnd_dat->Uid = cpu_to_le64(pinode->i_uid);
 199         pfnd_dat->Gid = cpu_to_le64(pinode->i_gid);
 200 }
 201
 202 int cifs_get_inode_info_unix(struct inode **pinode,
 203         const unsigned char *full_path, struct super_block *sb, int xid)
 204 {
 205         int rc = 0;
 206         FILE_UNIX_BASIC_INFO find_data;
 207         struct cifsTconInfo *pTcon;
 208         struct inode *inode;
 209         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 210         bool is_dfs_referral = false;
 211         struct cifsInodeInfo *cifsInfo;
 212         __u64 num_of_bytes;
 213         __u64 end_of_file;
 214
 215         pTcon = cifs_sb->tcon;
 216         cFYI(1, ("Getting info on %s", full_path));
 217
 218         /* could have done a find first instead but this returns more info */
 219         rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &find_data,
 220                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 221                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 222         if (rc == -EREMOTE && !is_dfs_referral) {
 223                 is_dfs_referral = true;
 224                 cFYI(DBG2, ("DFS ref"));
 225                 /* for DFS, server does not give us real inode data */
 226                 fill_fake_finddataunix(&find_data, sb);
 227                 rc = 0;
 228         } else if (rc)
 229                 goto cgiiu_exit;
 230
 231         num_of_bytes = le64_to_cpu(find_data.NumOfBytes);
 232         end_of_file = le64_to_cpu(find_data.EndOfFile);
 233
 234         /* get new inode */
 235         if (*pinode == NULL) {
 236                 *pinode = new_inode(sb);
 237                 if (*pinode == NULL) {
 238                         rc = -ENOMEM;
 239                         goto cgiiu_exit;
 240                 }
 241                 /* Is an i_ino of zero legal? */
 242                 /* note ino incremented to unique num in new_inode */
 243                 /* Are there sanity checks we can use to ensure that
 244                    the server is really filling in that field? */
 245                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 246                         (*pinode)->i_ino = (unsigned long)find_data.UniqueId;
 247
 248                 if (sb->s_flags & MS_NOATIME)
 249                         (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
 250
 251                 insert_inode_hash(*pinode);
 252         }
 253
 254         inode = *pinode;
 255         cifsInfo = CIFS_I(inode);
 256
 257         cFYI(1, ("Old time %ld", cifsInfo->time));
 258         cifsInfo->time = jiffies;
 259         cFYI(1, ("New time %ld", cifsInfo->time));
 260         /* this is ok to set on every inode revalidate */
 261         atomic_set(&cifsInfo->inUse, 1);
 262
 263         cifs_unix_info_to_inode(inode, &find_data, 0);
 264
 265         if (num_of_bytes < end_of_file)
 266                 cFYI(1, ("allocation size less than end of file"));
 267         cFYI(1, ("Size %ld and blocks %llu",
 268                 (unsigned long) inode->i_size,
 269                 (unsigned long long)inode->i_blocks));
 270
 271         cifs_set_ops(inode, is_dfs_referral);
 272 cgiiu_exit:
 273         return rc;
 274 }
 275
 276 static int decode_sfu_inode(struct inode *inode, __u64 size,
 277                             const unsigned char *path,
 278                             struct cifs_sb_info *cifs_sb, int xid)
 279 {
 280         int rc;
 281         int oplock = 0;
 282         __u16 netfid;
 283         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 284         char buf[24];
 285         unsigned int bytes_read;
 286         char *pbuf;
 287
 288         pbuf = buf;
 289
 290         if (size == 0) {
 291                 inode->i_mode |= S_IFIFO;
 292                 return 0;
 293         } else if (size < 8) {
 294                 return -EINVAL;  /* EOPNOTSUPP? */
 295         }
 296
 297         rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
 298                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 299                          cifs_sb->local_nls,
 300                          cifs_sb->mnt_cifs_flags &
 301                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 302         if (rc == 0) {
 303                 int buf_type = CIFS_NO_BUFFER;
 304                         /* Read header */
 305                 rc = CIFSSMBRead(xid, pTcon,
 306                                  netfid,
 307                                  24 /* length */, 0 /* offset */,
 308                                  &bytes_read, &pbuf, &buf_type);
 309                 if ((rc == 0) && (bytes_read >= 8)) {
 310                         if (memcmp("IntxBLK", pbuf, 8) == 0) {
 311                                 cFYI(1, ("Block device"));
 312                                 inode->i_mode |= S_IFBLK;
 313                                 if (bytes_read == 24) {
 314                                         /* we have enough to decode dev num */
 315                                         __u64 mjr; /* major */
 316                                         __u64 mnr; /* minor */
 317                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 318                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 319                                         inode->i_rdev = MKDEV(mjr, mnr);
 320                                 }
 321                         } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
 322                                 cFYI(1, ("Char device"));
 323                                 inode->i_mode |= S_IFCHR;
 324                                 if (bytes_read == 24) {
 325                                         /* we have enough to decode dev num */
 326                                         __u64 mjr; /* major */
 327                                         __u64 mnr; /* minor */
 328                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 329                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 330                                         inode->i_rdev = MKDEV(mjr, mnr);
 331                                 }
 332                         } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
 333                                 cFYI(1, ("Symlink"));
 334                                 inode->i_mode |= S_IFLNK;
 335                         } else {
 336                                 inode->i_mode |= S_IFREG; /* file? */
 337                                 rc = -EOPNOTSUPP;
 338                         }
 339                 } else {
 340                         inode->i_mode |= S_IFREG; /* then it is a file */
 341                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 342                 }
 343                 CIFSSMBClose(xid, pTcon, netfid);
 344         }
 345         return rc;
 346 }
 347
 348 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 349
 350 static int get_sfu_mode(struct inode *inode,
 351                         const unsigned char *path,
 352                         struct cifs_sb_info *cifs_sb, int xid)
 353 {
 354 #ifdef CONFIG_CIFS_XATTR
 355         ssize_t rc;
 356         char ea_value[4];
 357         __u32 mode;
 358
 359         rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
 360                         ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 361                 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 362         if (rc < 0)
 363                 return (int)rc;
 364         else if (rc > 3) {
 365                 mode = le32_to_cpu(*((__le32 *)ea_value));
 366                 inode->i_mode &= ~SFBITS_MASK;
 367                 cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
 368                 inode->i_mode = (mode &  SFBITS_MASK) | inode->i_mode;
 369                 cFYI(1, ("special mode bits 0%o", mode));
 370                 return 0;
 371         } else {
 372                 return 0;
 373         }
 374 #else
 375         return -EOPNOTSUPP;
 376 #endif
 377 }
 378
 379 /*
 380  *      Needed to setup inode data for the directory which is the
 381  *      junction to the new submount (ie to setup the fake directory
 382  *      which represents a DFS referral)
 383  */
 384 static void fill_fake_finddata(FILE_ALL_INFO *pfnd_dat,
 385                                struct super_block *sb)
 386 {
 387         memset(pfnd_dat, 0, sizeof(FILE_ALL_INFO));
 388
 389 /*      __le64 pfnd_dat->AllocationSize = cpu_to_le64(0);
 390         __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
 391         __u8 pfnd_dat->DeletePending = 0;
 392         __u8 pfnd_data->Directory = 0;
 393         __le32 pfnd_dat->EASize = 0;
 394         __u64 pfnd_dat->IndexNumber = 0;
 395         __u64 pfnd_dat->IndexNumber1 = 0;  */
 396         pfnd_dat->CreationTime =
 397                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 398         pfnd_dat->LastAccessTime =
 399                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 400         pfnd_dat->LastWriteTime =
 401                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 402         pfnd_dat->ChangeTime =
 403                 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 404         pfnd_dat->Attributes = cpu_to_le32(ATTR_DIRECTORY);
 405         pfnd_dat->NumberOfLinks = cpu_to_le32(2);
 406 }
 407
 408 int cifs_get_inode_info(struct inode **pinode,
 409         const unsigned char *full_path, FILE_ALL_INFO *pfindData,
 410         struct super_block *sb, int xid, const __u16 *pfid)
 411 {
 412         int rc = 0;
 413         __u32 attr;
 414         struct cifsInodeInfo *cifsInfo;
 415         struct cifsTconInfo *pTcon;
 416         struct inode *inode;
 417         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 418         char *buf = NULL;
 419         bool adjustTZ = false;
 420         bool is_dfs_referral = false;
 421         umode_t default_mode;
 422
 423         pTcon = cifs_sb->tcon;
 424         cFYI(1, ("Getting info on %s", full_path));
 425
 426         if ((pfindData == NULL) && (*pinode != NULL)) {
 427                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 428                         cFYI(1, ("No need to revalidate cached inode sizes"));
 429                         return rc;
 430                 }
 431         }
 432
 433         /* if file info not passed in then get it from server */
 434         if (pfindData == NULL) {
 435                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 436                 if (buf == NULL)
 437                         return -ENOMEM;
 438                 pfindData = (FILE_ALL_INFO *)buf;
 439
 440                 /* could do find first instead but this returns more info */
 441                 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
 442                               0 /* not legacy */,
 443                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 444                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 445                 /* BB optimize code so we do not make the above call
 446                 when server claims no NT SMB support and the above call
 447                 failed at least once - set flag in tcon or mount */
 448                 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 449                         rc = SMBQueryInformation(xid, pTcon, full_path,
 450                                         pfindData, cifs_sb->local_nls,
 451                                         cifs_sb->mnt_cifs_flags &
 452                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 453                         adjustTZ = true;
 454                 }
 455         }
 456         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
 457         if (rc == -EREMOTE) {
 458                 is_dfs_referral = true;
 459                 fill_fake_finddata(pfindData, sb);
 460                 rc = 0;
 461         } else if (rc)
 462                 goto cgii_exit;
 463
 464         attr = le32_to_cpu(pfindData->Attributes);
 465
 466         /* get new inode */
 467         if (*pinode == NULL) {
 468                 *pinode = new_inode(sb);
 469                 if (*pinode == NULL) {
 470                         rc = -ENOMEM;
 471                         goto cgii_exit;
 472                 }
 473                 /* Is an i_ino of zero legal? Can we use that to check
 474                    if the server supports returning inode numbers?  Are
 475                    there other sanity checks we can use to ensure that
 476                    the server is really filling in that field? */
 477
 478                 /* We can not use the IndexNumber field by default from
 479                    Windows or Samba (in ALL_INFO buf) but we can request
 480                    it explicitly.  It may not be unique presumably if
 481                    the server has multiple devices mounted under one share */
 482
 483                 /* There may be higher info levels that work but are
 484                    there Windows server or network appliances for which
 485                    IndexNumber field is not guaranteed unique? */
 486
 487                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 488                         int rc1 = 0;
 489                         __u64 inode_num;
 490
 491                         rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 492                                         full_path, &inode_num,
 493                                         cifs_sb->local_nls,
 494                                         cifs_sb->mnt_cifs_flags &
 495                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 496                         if (rc1) {
 497                                 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
 498                                 /* BB EOPNOSUPP disable SERVER_INUM? */
 499                         } else /* do we need cast or hash to ino? */
 500                                 (*pinode)->i_ino = inode_num;
 501                 } /* else ino incremented to unique num in new_inode*/
 502                 if (sb->s_flags & MS_NOATIME)
 503                         (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
 504                 insert_inode_hash(*pinode);
 505         }
 506         inode = *pinode;
 507         cifsInfo = CIFS_I(inode);
 508         cifsInfo->cifsAttrs = attr;
 509         cFYI(1, ("Old time %ld", cifsInfo->time));
 510         cifsInfo->time = jiffies;
 511         cFYI(1, ("New time %ld", cifsInfo->time));
 512
 513         /* blksize needs to be multiple of two. So safer to default to
 514         blksize and blkbits set in superblock so 2**blkbits and blksize
 515         will match rather than setting to:
 516         (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 517
 518         /* Linux can not store file creation time so ignore it */
 519         if (pfindData->LastAccessTime)
 520                 inode->i_atime = cifs_NTtimeToUnix
 521                         (le64_to_cpu(pfindData->LastAccessTime));
 522         else /* do not need to use current_fs_time - time not stored */
 523                 inode->i_atime = CURRENT_TIME;
 524         inode->i_mtime =
 525                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 526         inode->i_ctime =
 527             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 528         cFYI(DBG2, ("Attributes came in as 0x%x", attr));
 529         if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
 530                 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
 531                 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
 532         }
 533
 534         /* get default inode mode */
 535         if (attr & ATTR_DIRECTORY)
 536                 default_mode = cifs_sb->mnt_dir_mode;
 537         else
 538                 default_mode = cifs_sb->mnt_file_mode;
 539
 540         /* set permission bits */
 541         if (atomic_read(&cifsInfo->inUse) == 0 ||
 542             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
 543                 inode->i_mode = default_mode;
 544         else {
 545                 /* just reenable write bits if !ATTR_READONLY */
 546                 if ((inode->i_mode & S_IWUGO) == 0 &&
 547                     (attr & ATTR_READONLY) == 0)
 548                         inode->i_mode |= (S_IWUGO & default_mode);
 549
 550                 inode->i_mode &= ~S_IFMT;
 551         }
 552         /* clear write bits if ATTR_READONLY is set */
 553         if (attr & ATTR_READONLY)
 554                 inode->i_mode &= ~S_IWUGO;
 555
 556         /* set inode type */
 557         if ((attr & ATTR_SYSTEM) &&
 558             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
 559                 /* no need to fix endianness on 0 */
 560                 if (pfindData->EndOfFile == 0)
 561                         inode->i_mode |= S_IFIFO;
 562                 else if (decode_sfu_inode(inode,
 563                                 le64_to_cpu(pfindData->EndOfFile),
 564                                 full_path, cifs_sb, xid))
 565                         cFYI(1, ("unknown SFU file type\n"));
 566         } else {
 567                 if (attr & ATTR_DIRECTORY)
 568                         inode->i_mode |= S_IFDIR;
 569                 else
 570                         inode->i_mode |= S_IFREG;
 571         }
 572
 573         spin_lock(&inode->i_lock);
 574         if (is_size_safe_to_change(cifsInfo,
 575                                    le64_to_cpu(pfindData->EndOfFile))) {
 576                 /* can not safely shrink the file size here if the
 577                    client is writing to it due to potential races */
 578                 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
 579
 580                 /* 512 bytes (2**9) is the fake blocksize that must be
 581                    used for this calculation */
 582                 inode->i_blocks = (512 - 1 + le64_to_cpu(
 583                                    pfindData->AllocationSize)) >> 9;
 584         }
 585         spin_unlock(&inode->i_lock);
 586
 587         inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 588
 589         /* BB fill in uid and gid here? with help from winbind?
 590            or retrieve from NTFS stream extended attribute */
 591 #ifdef CONFIG_CIFS_EXPERIMENTAL
 592         /* fill in 0777 bits from ACL */
 593         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 594                 cFYI(1, ("Getting mode bits from ACL"));
 595                 acl_to_uid_mode(inode, full_path, pfid);
 596         }
 597 #endif
 598         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 599                 /* fill in remaining high mode bits e.g. SUID, VTX */
 600                 get_sfu_mode(inode, full_path, cifs_sb, xid);
 601         } else if (atomic_read(&cifsInfo->inUse) == 0) {
 602                 inode->i_uid = cifs_sb->mnt_uid;
 603                 inode->i_gid = cifs_sb->mnt_gid;
 604                 /* set so we do not keep refreshing these fields with
 605                    bad data after user has changed them in memory */
 606                 atomic_set(&cifsInfo->inUse, 1);
 607         }
 608
 609         cifs_set_ops(inode, is_dfs_referral);
 610
 611
 612
 613
 614 cgii_exit:
 615         kfree(buf);
 616         return rc;
 617 }
 618
 619 static const struct inode_operations cifs_ipc_inode_ops = {
 620         .lookup = cifs_lookup,
 621 };
 622
 623 /* gets root inode */
 624 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
 625 {
 626         int xid;
 627         struct cifs_sb_info *cifs_sb;
 628         struct inode *inode;
 629         long rc;
 630
 631         inode = iget_locked(sb, ino);
 632         if (!inode)
 633                 return ERR_PTR(-ENOMEM);
 634         if (!(inode->i_state & I_NEW))
 635                 return inode;
 636
 637         cifs_sb = CIFS_SB(inode->i_sb);
 638         xid = GetXid();
 639
 640         if (cifs_sb->tcon->unix_ext)
 641                 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
 642         else
 643                 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
 644                                          NULL);
 645         if (rc && cifs_sb->tcon->ipc) {
 646                 cFYI(1, ("ipc connection - fake read inode"));
 647                 inode->i_mode |= S_IFDIR;
 648                 inode->i_nlink = 2;
 649                 inode->i_op = &cifs_ipc_inode_ops;
 650                 inode->i_fop = &simple_dir_operations;
 651                 inode->i_uid = cifs_sb->mnt_uid;
 652                 inode->i_gid = cifs_sb->mnt_gid;
 653         } else if (rc) {
 654                 _FreeXid(xid);
 655                 iget_failed(inode);
 656                 return ERR_PTR(rc);
 657         }
 658
 659         unlock_new_inode(inode);
 660
 661         /* can not call macro FreeXid here since in a void func
 662          * TODO: This is no longer true
 663          */
 664         _FreeXid(xid);
 665         return inode;
 666 }
 667
 668 static int
 669 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
 670                     char *full_path, __u32 dosattr)
 671 {
 672         int rc;
 673         int oplock = 0;
 674         __u16 netfid;
 675         __u32 netpid;
 676         bool set_time = false;
 677         struct cifsFileInfo *open_file;
 678         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 679         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 680         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 681         FILE_BASIC_INFO info_buf;
 682
 683         if (attrs->ia_valid & ATTR_ATIME) {
 684                 set_time = true;
 685                 info_buf.LastAccessTime =
 686                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
 687         } else
 688                 info_buf.LastAccessTime = 0;
 689
 690         if (attrs->ia_valid & ATTR_MTIME) {
 691                 set_time = true;
 692                 info_buf.LastWriteTime =
 693                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
 694         } else
 695                 info_buf.LastWriteTime = 0;
 696
 697         /*
 698          * Samba throws this field away, but windows may actually use it.
 699          * Do not set ctime unless other time stamps are changed explicitly
 700          * (i.e. by utimes()) since we would then have a mix of client and
 701          * server times.
 702          */
 703         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
 704                 cFYI(1, ("CIFS - CTIME changed"));
 705                 info_buf.ChangeTime =
 706                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
 707         } else
 708                 info_buf.ChangeTime = 0;
 709
 710         info_buf.CreationTime = 0;      /* don't change */
 711         info_buf.Attributes = cpu_to_le32(dosattr);
 712
 713         /*
 714          * If the file is already open for write, just use that fileid
 715          */
 716         open_file = find_writable_file(cifsInode);
 717         if (open_file) {
 718                 netfid = open_file->netfid;
 719                 netpid = open_file->pid;
 720                 goto set_via_filehandle;
 721         }
 722
 723         /*
 724          * NT4 apparently returns success on this call, but it doesn't
 725          * really work.
 726          */
 727         if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
 728                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
 729                                      &info_buf, cifs_sb->local_nls,
 730                                      cifs_sb->mnt_cifs_flags &
 731                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 732                 if (rc == 0) {
 733                         cifsInode->cifsAttrs = dosattr;
 734                         goto out;
 735                 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
 736                         goto out;
 737         }
 738
 739         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
 740                  "times not supported by this server"));
 741         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
 742                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
 743                          CREATE_NOT_DIR, &netfid, &oplock,
 744                          NULL, cifs_sb->local_nls,
 745                          cifs_sb->mnt_cifs_flags &
 746                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 747
 748         if (rc != 0) {
 749                 if (rc == -EIO)
 750                         rc = -EINVAL;
 751                 goto out;
 752         }
 753
 754         netpid = current->tgid;
 755
 756 set_via_filehandle:
 757         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
 758         if (!rc)
 759                 cifsInode->cifsAttrs = dosattr;
 760
 761         if (open_file == NULL)
 762                 CIFSSMBClose(xid, pTcon, netfid);
 763         else
 764                 atomic_dec(&open_file->wrtPending);
 765 out:
 766         return rc;
 767 }
 768
 769 /*
 770  * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 771  * and rename it to a random name that hopefully won't conflict with
 772  * anything else.
 773  */
 774 static int
 775 cifs_rename_pending_delete(char *full_path, struct inode *inode, int xid)
 776 {
 777         int oplock = 0;
 778         int rc;
 779         __u16 netfid;
 780         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 781         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 782         struct cifsTconInfo *tcon = cifs_sb->tcon;
 783         __u32 dosattr;
 784         FILE_BASIC_INFO *info_buf;
 785
 786         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 787                          DELETE|FILE_WRITE_ATTRIBUTES,
 788                          CREATE_NOT_DIR|CREATE_DELETE_ON_CLOSE,
 789                          &netfid, &oplock, NULL, cifs_sb->local_nls,
 790                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 791         if (rc != 0)
 792                 goto out;
 793
 794         /* set ATTR_HIDDEN and clear ATTR_READONLY */
 795         cifsInode = CIFS_I(inode);
 796         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
 797         if (dosattr == 0)
 798                 dosattr |= ATTR_NORMAL;
 799         dosattr |= ATTR_HIDDEN;
 800
 801         info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
 802         if (info_buf == NULL) {
 803                 rc = -ENOMEM;
 804                 goto out_close;
 805         }
 806         info_buf->Attributes = cpu_to_le32(dosattr);
 807         rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid, current->tgid);
 808         kfree(info_buf);
 809         if (rc != 0)
 810                 goto out_close;
 811         cifsInode->cifsAttrs = dosattr;
 812
 813         /* silly-rename the file */
 814         CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
 815                                    cifs_sb->mnt_cifs_flags &
 816                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 817
 818         /* set DELETE_ON_CLOSE */
 819         rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid, current->tgid);
 820
 821         /*
 822          * some samba versions return -ENOENT when we try to set the file
 823          * disposition here. Likely a samba bug, but work around it for now
 824          */
 825         if (rc == -ENOENT)
 826                 rc = 0;
 827
 828 out_close:
 829         CIFSSMBClose(xid, tcon, netfid);
 830 out:
 831         return rc;
 832 }
 833
 834 int cifs_unlink(struct inode *dir, struct dentry *dentry)
 835 {
 836         int rc = 0;
 837         int xid;
 838         char *full_path = NULL;
 839         struct inode *inode = dentry->d_inode;
 840         struct cifsInodeInfo *cifsInode;
 841         struct super_block *sb = dir->i_sb;
 842         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 843         struct cifsTconInfo *tcon = cifs_sb->tcon;
 844         struct iattr *attrs;
 845         __u32 dosattr;
 846
 847         cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
 848
 849         xid = GetXid();
 850
 851         /* Unlink can be called from rename so we can not take the
 852          * sb->s_vfs_rename_mutex here */
 853         full_path = build_path_from_dentry(dentry);
 854         if (full_path == NULL) {
 855                 FreeXid(xid);
 856                 return -ENOMEM;
 857         }
 858
 859         if ((tcon->ses->capabilities & CAP_UNIX) &&
 860                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 861                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 862                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
 863                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 864                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 865                 cFYI(1, ("posix del rc %d", rc));
 866                 if ((rc == 0) || (rc == -ENOENT))
 867                         goto psx_del_no_retry;
 868         }
 869
 870         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 871                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 872 psx_del_no_retry:
 873         if (!rc) {
 874                 if (inode)
 875                         drop_nlink(inode);
 876         } else if (rc == -ENOENT) {
 877                 d_drop(dentry);
 878         } else if (rc == -ETXTBSY) {
 879                 rc = cifs_rename_pending_delete(full_path, inode, xid);
 880                 if (rc == 0)
 881                         drop_nlink(inode);
 882         } else if (rc == -EACCES) {
 883                 /* try only if r/o attribute set in local lookup data? */
 884                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
 885                 if (attrs == NULL) {
 886                         rc = -ENOMEM;
 887                         goto out_reval;
 888                 }
 889
 890                 /* try to reset dos attributes */
 891                 cifsInode = CIFS_I(inode);
 892                 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
 893                 if (dosattr == 0)
 894                         dosattr |= ATTR_NORMAL;
 895                 dosattr |= ATTR_HIDDEN;
 896
 897                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
 898                 kfree(attrs);
 899                 if (rc != 0)
 900                         goto out_reval;
 901                 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 902                                     cifs_sb->mnt_cifs_flags &
 903                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 904                 if (rc == 0) {
 905                         if (inode)
 906                                 drop_nlink(inode);
 907                 } else if (rc == -ETXTBSY) {
 908                         rc = cifs_rename_pending_delete(full_path, inode, xid);
 909                         if (rc == 0)
 910                                 drop_nlink(inode);
 911                 }
 912         }
 913 out_reval:
 914         if (inode) {
 915                 cifsInode = CIFS_I(inode);
 916                 cifsInode->time = 0;    /* will force revalidate to get info
 917                                            when needed */
 918                 inode->i_ctime = current_fs_time(sb);
 919         }
 920         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
 921         cifsInode = CIFS_I(dir);
 922         cifsInode->time = 0;    /* force revalidate of dir as well */
 923
 924         kfree(full_path);
 925         FreeXid(xid);
 926         return rc;
 927 }
 928
 929 static void posix_fill_in_inode(struct inode *tmp_inode,
 930         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 931 {
 932         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 933         loff_t local_size;
 934         struct timespec local_mtime;
 935
 936         cifsInfo->time = jiffies;
 937         atomic_inc(&cifsInfo->inUse);
 938
 939         /* save mtime and size */
 940         local_mtime = tmp_inode->i_mtime;
 941         local_size  = tmp_inode->i_size;
 942
 943         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 944         cifs_set_ops(tmp_inode, false);
 945
 946         if (!S_ISREG(tmp_inode->i_mode))
 947                 return;
 948
 949         /*
 950          * No sense invalidating pages for new inode
 951          * since we we have not started caching
 952          * readahead file data yet.
 953          */
 954         if (isNewInode)
 955                 return;
 956
 957         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 958                 (local_size == tmp_inode->i_size)) {
 959                 cFYI(1, ("inode exists but unchanged"));
 960         } else {
 961                 /* file may have changed on server */
 962                 cFYI(1, ("invalidate inode, readdir detected change"));
 963                 invalidate_remote_inode(tmp_inode);
 964         }
 965 }
 966
 967 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 968 {
 969         int rc = 0, tmprc;
 970         int xid;
 971         struct cifs_sb_info *cifs_sb;
 972         struct cifsTconInfo *pTcon;
 973         char *full_path = NULL;
 974         struct inode *newinode = NULL;
 975
 976         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 977
 978         xid = GetXid();
 979
 980         cifs_sb = CIFS_SB(inode->i_sb);
 981         pTcon = cifs_sb->tcon;
 982
 983         full_path = build_path_from_dentry(direntry);
 984         if (full_path == NULL) {
 985                 FreeXid(xid);
 986                 return -ENOMEM;
 987         }
 988
 989         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 990                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 991                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 992                 u32 oplock = 0;
 993                 FILE_UNIX_BASIC_INFO *pInfo =
 994                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 995                 if (pInfo == NULL) {
 996                         rc = -ENOMEM;
 997                         goto mkdir_out;
 998                 }
 999
1000                 mode &= ~current->fs->umask;
1001                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1002                                 mode, NULL /* netfid */, pInfo, &oplock,
1003                                 full_path, cifs_sb->local_nls,
1004                                 cifs_sb->mnt_cifs_flags &
1005                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1006                 if (rc == -EOPNOTSUPP) {
1007                         kfree(pInfo);
1008                         goto mkdir_retry_old;
1009                 } else if (rc) {
1010                         cFYI(1, ("posix mkdir returned 0x%x", rc));
1011                         d_drop(direntry);
1012                 } else {
1013                         if (pInfo->Type == cpu_to_le32(-1)) {
1014                                 /* no return info, go query for it */
1015                                 kfree(pInfo);
1016                                 goto mkdir_get_info;
1017                         }
1018 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1019         to set uid/gid */
1020                         inc_nlink(inode);
1021                         if (pTcon->nocase)
1022                                 direntry->d_op = &cifs_ci_dentry_ops;
1023                         else
1024                                 direntry->d_op = &cifs_dentry_ops;
1025
1026                         newinode = new_inode(inode->i_sb);
1027                         if (newinode == NULL) {
1028                                 kfree(pInfo);
1029                                 goto mkdir_get_info;
1030                         }
1031
1032                         /* Is an i_ino of zero legal? */
1033                         /* Are there sanity checks we can use to ensure that
1034                            the server is really filling in that field? */
1035                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1036                                 newinode->i_ino =
1037                                         (unsigned long)pInfo->UniqueId;
1038                         } /* note ino incremented to unique num in new_inode */
1039                         if (inode->i_sb->s_flags & MS_NOATIME)
1040                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
1041                         newinode->i_nlink = 2;
1042
1043                         insert_inode_hash(newinode);
1044                         d_instantiate(direntry, newinode);
1045
1046                         /* we already checked in POSIXCreate whether
1047                            frame was long enough */
1048                         posix_fill_in_inode(direntry->d_inode,
1049                                         pInfo, 1 /* NewInode */);
1050 #ifdef CONFIG_CIFS_DEBUG2
1051                         cFYI(1, ("instantiated dentry %p %s to inode %p",
1052                                 direntry, direntry->d_name.name, newinode));
1053
1054                         if (newinode->i_nlink != 2)
1055                                 cFYI(1, ("unexpected number of links %d",
1056                                         newinode->i_nlink));
1057 #endif
1058                 }
1059                 kfree(pInfo);
1060                 goto mkdir_out;
1061         }
1062 mkdir_retry_old:
1063         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1064         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1065                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1066         if (rc) {
1067                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1068                 d_drop(direntry);
1069         } else {
1070 mkdir_get_info:
1071                 inc_nlink(inode);
1072                 if (pTcon->unix_ext)
1073                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1074                                                       inode->i_sb, xid);
1075                 else
1076                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1077                                                  inode->i_sb, xid, NULL);
1078
1079                 if (pTcon->nocase)
1080                         direntry->d_op = &cifs_ci_dentry_ops;
1081                 else
1082                         direntry->d_op = &cifs_dentry_ops;
1083                 d_instantiate(direntry, newinode);
1084                  /* setting nlink not necessary except in cases where we
1085                   * failed to get it from the server or was set bogus */
1086                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1087                                 direntry->d_inode->i_nlink = 2;
1088
1089                 mode &= ~current->fs->umask;
1090                 /* must turn on setgid bit if parent dir has it */
1091                 if (inode->i_mode & S_ISGID)
1092                         mode |= S_ISGID;
1093
1094                 if (pTcon->unix_ext) {
1095                         struct cifs_unix_set_info_args args = {
1096                                 .mode   = mode,
1097                                 .ctime  = NO_CHANGE_64,
1098                                 .atime  = NO_CHANGE_64,
1099                                 .mtime  = NO_CHANGE_64,
1100                                 .device = 0,
1101                         };
1102                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1103                                 args.uid = (__u64)current->fsuid;
1104                                 if (inode->i_mode & S_ISGID)
1105                                         args.gid = (__u64)inode->i_gid;
1106                                 else
1107                                         args.gid = (__u64)current->fsgid;
1108                         } else {
1109                                 args.uid = NO_CHANGE_64;
1110                                 args.gid = NO_CHANGE_64;
1111                         }
1112                         CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1113                                             cifs_sb->local_nls,
1114                                             cifs_sb->mnt_cifs_flags &
1115                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1116                 } else {
1117                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1118                             (mode & S_IWUGO) == 0) {
1119                                 FILE_BASIC_INFO pInfo;
1120                                 struct cifsInodeInfo *cifsInode;
1121                                 u32 dosattrs;
1122
1123                                 memset(&pInfo, 0, sizeof(pInfo));
1124                                 cifsInode = CIFS_I(newinode);
1125                                 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1126                                 pInfo.Attributes = cpu_to_le32(dosattrs);
1127                                 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1128                                                 full_path, &pInfo,
1129                                                 cifs_sb->local_nls,
1130                                                 cifs_sb->mnt_cifs_flags &
1131                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1132                                 if (tmprc == 0)
1133                                         cifsInode->cifsAttrs = dosattrs;
1134                         }
1135                         if (direntry->d_inode) {
1136                                 if (cifs_sb->mnt_cifs_flags &
1137                                      CIFS_MOUNT_DYNPERM)
1138                                         direntry->d_inode->i_mode =
1139                                                 (mode | S_IFDIR);
1140
1141                                 if (cifs_sb->mnt_cifs_flags &
1142                                      CIFS_MOUNT_SET_UID) {
1143                                         direntry->d_inode->i_uid =
1144                                                 current->fsuid;
1145                                         if (inode->i_mode & S_ISGID)
1146                                                 direntry->d_inode->i_gid =
1147                                                         inode->i_gid;
1148                                         else
1149                                                 direntry->d_inode->i_gid =
1150                                                         current->fsgid;
1151                                 }
1152                         }
1153                 }
1154         }
1155 mkdir_out:
1156         kfree(full_path);
1157         FreeXid(xid);
1158         return rc;
1159 }
1160
1161 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1162 {
1163         int rc = 0;
1164         int xid;
1165         struct cifs_sb_info *cifs_sb;
1166         struct cifsTconInfo *pTcon;
1167         char *full_path = NULL;
1168         struct cifsInodeInfo *cifsInode;
1169
1170         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1171
1172         xid = GetXid();
1173
1174         cifs_sb = CIFS_SB(inode->i_sb);
1175         pTcon = cifs_sb->tcon;
1176
1177         full_path = build_path_from_dentry(direntry);
1178         if (full_path == NULL) {
1179                 FreeXid(xid);
1180                 return -ENOMEM;
1181         }
1182
1183         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1184                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1185
1186         if (!rc) {
1187                 drop_nlink(inode);
1188                 spin_lock(&direntry->d_inode->i_lock);
1189                 i_size_write(direntry->d_inode, 0);
1190                 clear_nlink(direntry->d_inode);
1191                 spin_unlock(&direntry->d_inode->i_lock);
1192         }
1193
1194         cifsInode = CIFS_I(direntry->d_inode);
1195         cifsInode->time = 0;    /* force revalidate to go get info when
1196                                    needed */
1197         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1198                 current_fs_time(inode->i_sb);
1199
1200         kfree(full_path);
1201         FreeXid(xid);
1202         return rc;
1203 }
1204
1205 static int
1206 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1207                 struct dentry *to_dentry, const char *toPath)
1208 {
1209         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1210         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1211         __u16 srcfid;
1212         int oplock, rc;
1213
1214         /* try path-based rename first */
1215         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1216                            cifs_sb->mnt_cifs_flags &
1217                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1218
1219         /*
1220          * don't bother with rename by filehandle unless file is busy and
1221          * source Note that cross directory moves do not work with
1222          * rename by filehandle to various Windows servers.
1223          */
1224         if (rc == 0 || rc != -ETXTBSY)
1225                 return rc;
1226
1227         /* open the file to be renamed -- we need DELETE perms */
1228         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1229                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1230                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1231                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1232
1233         if (rc == 0) {
1234                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1235                                 (const char *) to_dentry->d_name.name,
1236                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1237                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1238
1239                 CIFSSMBClose(xid, pTcon, srcfid);
1240         }
1241
1242         return rc;
1243 }
1244
1245 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1246         struct inode *target_inode, struct dentry *target_direntry)
1247 {
1248         char *fromName = NULL;
1249         char *toName = NULL;
1250         struct cifs_sb_info *cifs_sb_source;
1251         struct cifs_sb_info *cifs_sb_target;
1252         struct cifsTconInfo *pTcon;
1253         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1254         FILE_UNIX_BASIC_INFO *info_buf_target;
1255         int xid;
1256         int rc;
1257
1258         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1259         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1260         pTcon = cifs_sb_source->tcon;
1261
1262         xid = GetXid();
1263
1264         /*
1265          * BB: this might be allowed if same server, but different share.
1266          * Consider adding support for this
1267          */
1268         if (pTcon != cifs_sb_target->tcon) {
1269                 rc = -EXDEV;
1270                 goto cifs_rename_exit;
1271         }
1272
1273         /*
1274          * we already have the rename sem so we do not need to
1275          * grab it again here to protect the path integrity
1276          */
1277         fromName = build_path_from_dentry(source_direntry);
1278         if (fromName == NULL) {
1279                 rc = -ENOMEM;
1280                 goto cifs_rename_exit;
1281         }
1282
1283         toName = build_path_from_dentry(target_direntry);
1284         if (toName == NULL) {
1285                 rc = -ENOMEM;
1286                 goto cifs_rename_exit;
1287         }
1288
1289         rc = cifs_do_rename(xid, source_direntry, fromName,
1290                             target_direntry, toName);
1291
1292         if (rc == -EEXIST) {
1293                 if (pTcon->unix_ext) {
1294                         /*
1295                          * Are src and dst hardlinks of same inode? We can
1296                          * only tell with unix extensions enabled
1297                          */
1298                         info_buf_source =
1299                                 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1300                                                 GFP_KERNEL);
1301                         if (info_buf_source == NULL)
1302                                 goto unlink_target;
1303
1304                         info_buf_target = info_buf_source + 1;
1305                         rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1306                                                 info_buf_source,
1307                                                 cifs_sb_source->local_nls,
1308                                                 cifs_sb_source->mnt_cifs_flags &
1309                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1310                         if (rc != 0)
1311                                 goto unlink_target;
1312
1313                         rc = CIFSSMBUnixQPathInfo(xid, pTcon,
1314                                                 toName, info_buf_target,
1315                                                 cifs_sb_target->local_nls,
1316                                                 /* remap based on source sb */
1317                                                 cifs_sb_source->mnt_cifs_flags &
1318                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1319
1320                         if (rc == 0 && (info_buf_source->UniqueId ==
1321                                         info_buf_target->UniqueId))
1322                                 /* same file, POSIX says that this is a noop */
1323                                 goto cifs_rename_exit;
1324                 } /* else ... BB we could add the same check for Windows by
1325                      checking the UniqueId via FILE_INTERNAL_INFO */
1326 unlink_target:
1327                 /*
1328                  * we either can not tell the files are hardlinked (as with
1329                  * Windows servers) or files are not hardlinked. Delete the
1330                  * target manually before renaming to follow POSIX rather than
1331                  * Windows semantics
1332                  */
1333                 cifs_unlink(target_inode, target_direntry);
1334                 rc = cifs_do_rename(xid, source_direntry, fromName,
1335                                     target_direntry, toName);
1336         }
1337
1338 cifs_rename_exit:
1339         kfree(info_buf_source);
1340         kfree(fromName);
1341         kfree(toName);
1342         FreeXid(xid);
1343         return rc;
1344 }
1345
1346 int cifs_revalidate(struct dentry *direntry)
1347 {
1348         int xid;
1349         int rc = 0, wbrc = 0;
1350         char *full_path;
1351         struct cifs_sb_info *cifs_sb;
1352         struct cifsInodeInfo *cifsInode;
1353         loff_t local_size;
1354         struct timespec local_mtime;
1355         bool invalidate_inode = false;
1356
1357         if (direntry->d_inode == NULL)
1358                 return -ENOENT;
1359
1360         cifsInode = CIFS_I(direntry->d_inode);
1361
1362         if (cifsInode == NULL)
1363                 return -ENOENT;
1364
1365         /* no sense revalidating inode info on file that no one can write */
1366         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1367                 return rc;
1368
1369         xid = GetXid();
1370
1371         cifs_sb = CIFS_SB(direntry->d_sb);
1372
1373         /* can not safely grab the rename sem here if rename calls revalidate
1374            since that would deadlock */
1375         full_path = build_path_from_dentry(direntry);
1376         if (full_path == NULL) {
1377                 FreeXid(xid);
1378                 return -ENOMEM;
1379         }
1380         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1381                  "jiffies %ld", full_path, direntry->d_inode,
1382                  direntry->d_inode->i_count.counter, direntry,
1383                  direntry->d_time, jiffies));
1384
1385         if (cifsInode->time == 0) {
1386                 /* was set to zero previously to force revalidate */
1387         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1388                    lookupCacheEnabled) {
1389                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1390                     (direntry->d_inode->i_nlink == 1)) {
1391                         kfree(full_path);
1392                         FreeXid(xid);
1393                         return rc;
1394                 } else {
1395                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1396                 }
1397         }
1398
1399         /* save mtime and size */
1400         local_mtime = direntry->d_inode->i_mtime;
1401         local_size = direntry->d_inode->i_size;
1402
1403         if (cifs_sb->tcon->unix_ext) {
1404                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1405                                               direntry->d_sb, xid);
1406                 if (rc) {
1407                         cFYI(1, ("error on getting revalidate info %d", rc));
1408 /*                      if (rc != -ENOENT)
1409                                 rc = 0; */      /* BB should we cache info on
1410                                                    certain errors? */
1411                 }
1412         } else {
1413                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1414                                          direntry->d_sb, xid, NULL);
1415                 if (rc) {
1416                         cFYI(1, ("error on getting revalidate info %d", rc));
1417 /*                      if (rc != -ENOENT)
1418                                 rc = 0; */      /* BB should we cache info on
1419                                                    certain errors? */
1420                 }
1421         }
1422         /* should we remap certain errors, access denied?, to zero */
1423
1424         /* if not oplocked, we invalidate inode pages if mtime or file size
1425            had changed on server */
1426
1427         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1428             (local_size == direntry->d_inode->i_size)) {
1429                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1430         } else {
1431                 /* file may have changed on server */
1432                 if (cifsInode->clientCanCacheRead) {
1433                         /* no need to invalidate inode pages since we were the
1434                            only ones who could have modified the file and the
1435                            server copy is staler than ours */
1436                 } else {
1437                         invalidate_inode = true;
1438                 }
1439         }
1440
1441         /* can not grab this sem since kernel filesys locking documentation
1442            indicates i_mutex may be taken by the kernel on lookup and rename
1443            which could deadlock if we grab the i_mutex here as well */
1444 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1445         /* need to write out dirty pages here  */
1446         if (direntry->d_inode->i_mapping) {
1447                 /* do we need to lock inode until after invalidate completes
1448                    below? */
1449                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1450                 if (wbrc)
1451                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1452         }
1453         if (invalidate_inode) {
1454         /* shrink_dcache not necessary now that cifs dentry ops
1455         are exported for negative dentries */
1456 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1457                         shrink_dcache_parent(direntry); */
1458                 if (S_ISREG(direntry->d_inode->i_mode)) {
1459                         if (direntry->d_inode->i_mapping) {
1460                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1461                                 if (wbrc)
1462                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1463                         }
1464                         /* may eventually have to do this for open files too */
1465                         if (list_empty(&(cifsInode->openFileList))) {
1466                                 /* changed on server - flush read ahead pages */
1467                                 cFYI(1, ("Invalidating read ahead data on "
1468                                          "closed file"));
1469                                 invalidate_remote_inode(direntry->d_inode);
1470                         }
1471                 }
1472         }
1473 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1474
1475         kfree(full_path);
1476         FreeXid(xid);
1477         return rc;
1478 }
1479
1480 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1481         struct kstat *stat)
1482 {
1483         int err = cifs_revalidate(dentry);
1484         if (!err) {
1485                 generic_fillattr(dentry->d_inode, stat);
1486                 stat->blksize = CIFS_MAX_MSGSIZE;
1487         }
1488         return err;
1489 }
1490
1491 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1492 {
1493         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1494         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1495         struct page *page;
1496         int rc = 0;
1497
1498         page = grab_cache_page(mapping, index);
1499         if (!page)
1500                 return -ENOMEM;
1501
1502         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1503         unlock_page(page);
1504         page_cache_release(page);
1505         return rc;
1506 }
1507
1508 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1509 {
1510         struct address_space *mapping = inode->i_mapping;
1511         unsigned long limit;
1512
1513         spin_lock(&inode->i_lock);
1514         if (inode->i_size < offset)
1515                 goto do_expand;
1516         /*
1517          * truncation of in-use swapfiles is disallowed - it would cause
1518          * subsequent swapout to scribble on the now-freed blocks.
1519          */
1520         if (IS_SWAPFILE(inode)) {
1521                 spin_unlock(&inode->i_lock);
1522                 goto out_busy;
1523         }
1524         i_size_write(inode, offset);
1525         spin_unlock(&inode->i_lock);
1526         /*
1527          * unmap_mapping_range is called twice, first simply for efficiency
1528          * so that truncate_inode_pages does fewer single-page unmaps. However
1529          * after this first call, and before truncate_inode_pages finishes,
1530          * it is possible for private pages to be COWed, which remain after
1531          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1532          * call must be made for correctness.
1533          */
1534         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1535         truncate_inode_pages(mapping, offset);
1536         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1537         goto out_truncate;
1538
1539 do_expand:
1540         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1541         if (limit != RLIM_INFINITY && offset > limit) {
1542                 spin_unlock(&inode->i_lock);
1543                 goto out_sig;
1544         }
1545         if (offset > inode->i_sb->s_maxbytes) {
1546                 spin_unlock(&inode->i_lock);
1547                 goto out_big;
1548         }
1549         i_size_write(inode, offset);
1550         spin_unlock(&inode->i_lock);
1551 out_truncate:
1552         if (inode->i_op && inode->i_op->truncate)
1553                 inode->i_op->truncate(inode);
1554         return 0;
1555 out_sig:
1556         send_sig(SIGXFSZ, current, 0);
1557 out_big:
1558         return -EFBIG;
1559 out_busy:
1560         return -ETXTBSY;
1561 }
1562
1563 static int
1564 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1565                    int xid, char *full_path)
1566 {
1567         int rc;
1568         struct cifsFileInfo *open_file;
1569         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1570         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1571         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1572
1573         /*
1574          * To avoid spurious oplock breaks from server, in the case of
1575          * inodes that we already have open, avoid doing path based
1576          * setting of file size if we can do it by handle.
1577          * This keeps our caching token (oplock) and avoids timeouts
1578          * when the local oplock break takes longer to flush
1579          * writebehind data than the SMB timeout for the SetPathInfo
1580          * request would allow
1581          */
1582         open_file = find_writable_file(cifsInode);
1583         if (open_file) {
1584                 __u16 nfid = open_file->netfid;
1585                 __u32 npid = open_file->pid;
1586                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1587                                         npid, false);
1588                 atomic_dec(&open_file->wrtPending);
1589                 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1590                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1591                         unsigned int bytes_written;
1592                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1593                                           &bytes_written, NULL, NULL, 1);
1594                         cFYI(1, ("Wrt seteof rc %d", rc));
1595                 }
1596         } else
1597                 rc = -EINVAL;
1598
1599         if (rc != 0) {
1600                 /* Set file size by pathname rather than by handle
1601                    either because no valid, writeable file handle for
1602                    it was found or because there was an error setting
1603                    it by handle */
1604                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1605                                    false, cifs_sb->local_nls,
1606                                    cifs_sb->mnt_cifs_flags &
1607                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1608                 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1609                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1610                         __u16 netfid;
1611                         int oplock = 0;
1612
1613                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1614                                 FILE_OPEN, GENERIC_WRITE,
1615                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1616                                 cifs_sb->local_nls,
1617                                 cifs_sb->mnt_cifs_flags &
1618                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1619                         if (rc == 0) {
1620                                 unsigned int bytes_written;
1621                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1622                                                   attrs->ia_size,
1623                                                   &bytes_written, NULL,
1624                                                   NULL, 1);
1625                                 cFYI(1, ("wrt seteof rc %d", rc));
1626                                 CIFSSMBClose(xid, pTcon, netfid);
1627                         }
1628                 }
1629         }
1630
1631         if (rc == 0) {
1632                 rc = cifs_vmtruncate(inode, attrs->ia_size);
1633                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1634         }
1635
1636         return rc;
1637 }
1638
1639 static int
1640 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1641 {
1642         int rc;
1643         int xid;
1644         char *full_path = NULL;
1645         struct inode *inode = direntry->d_inode;
1646         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1647         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1648         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1649         struct cifs_unix_set_info_args *args = NULL;
1650
1651         cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1652                  direntry->d_name.name, attrs->ia_valid));
1653
1654         xid = GetXid();
1655
1656         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1657                 /* check if we have permission to change attrs */
1658                 rc = inode_change_ok(inode, attrs);
1659                 if (rc < 0)
1660                         goto out;
1661                 else
1662                         rc = 0;
1663         }
1664
1665         full_path = build_path_from_dentry(direntry);
1666         if (full_path == NULL) {
1667                 rc = -ENOMEM;
1668                 goto out;
1669         }
1670
1671         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1672                 /*
1673                    Flush data before changing file size or changing the last
1674                    write time of the file on the server. If the
1675                    flush returns error, store it to report later and continue.
1676                    BB: This should be smarter. Why bother flushing pages that
1677                    will be truncated anyway? Also, should we error out here if
1678                    the flush returns error?
1679                  */
1680                 rc = filemap_write_and_wait(inode->i_mapping);
1681                 if (rc != 0) {
1682                         cifsInode->write_behind_rc = rc;
1683                         rc = 0;
1684                 }
1685         }
1686
1687         if (attrs->ia_valid & ATTR_SIZE) {
1688                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1689                 if (rc != 0)
1690                         goto out;
1691         }
1692
1693         /* skip mode change if it's just for clearing setuid/setgid */
1694         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1695                 attrs->ia_valid &= ~ATTR_MODE;
1696
1697         args = kmalloc(sizeof(*args), GFP_KERNEL);
1698         if (args == NULL) {
1699                 rc = -ENOMEM;
1700                 goto out;
1701         }
1702
1703         /* set up the struct */
1704         if (attrs->ia_valid & ATTR_MODE)
1705                 args->mode = attrs->ia_mode;
1706         else
1707                 args->mode = NO_CHANGE_64;
1708
1709         if (attrs->ia_valid & ATTR_UID)
1710                 args->uid = attrs->ia_uid;
1711         else
1712                 args->uid = NO_CHANGE_64;
1713
1714         if (attrs->ia_valid & ATTR_GID)
1715                 args->gid = attrs->ia_gid;
1716         else
1717                 args->gid = NO_CHANGE_64;
1718
1719         if (attrs->ia_valid & ATTR_ATIME)
1720                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1721         else
1722                 args->atime = NO_CHANGE_64;
1723
1724         if (attrs->ia_valid & ATTR_MTIME)
1725                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1726         else
1727                 args->mtime = NO_CHANGE_64;
1728
1729         if (attrs->ia_valid & ATTR_CTIME)
1730                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1731         else
1732                 args->ctime = NO_CHANGE_64;
1733
1734         args->device = 0;
1735         rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1736                                 cifs_sb->local_nls,
1737                                 cifs_sb->mnt_cifs_flags &
1738                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1739
1740         if (!rc)
1741                 rc = inode_setattr(inode, attrs);
1742 out:
1743         kfree(args);
1744         kfree(full_path);
1745         FreeXid(xid);
1746         return rc;
1747 }
1748
1749 static int
1750 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1751 {
1752         int xid;
1753         struct inode *inode = direntry->d_inode;
1754         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1755         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1756         char *full_path = NULL;
1757         int rc = -EACCES;
1758         __u32 dosattr = 0;
1759         __u64 mode = NO_CHANGE_64;
1760
1761         xid = GetXid();
1762
1763         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1764                  direntry->d_name.name, attrs->ia_valid));
1765
1766         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1767                 /* check if we have permission to change attrs */
1768                 rc = inode_change_ok(inode, attrs);
1769                 if (rc < 0) {
1770                         FreeXid(xid);
1771                         return rc;
1772                 } else
1773                         rc = 0;
1774         }
1775
1776         full_path = build_path_from_dentry(direntry);
1777         if (full_path == NULL) {
1778                 FreeXid(xid);
1779                 return -ENOMEM;
1780         }
1781
1782         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1783                 /*
1784                    Flush data before changing file size or changing the last
1785                    write time of the file on the server. If the
1786                    flush returns error, store it to report later and continue.
1787                    BB: This should be smarter. Why bother flushing pages that
1788                    will be truncated anyway? Also, should we error out here if
1789                    the flush returns error?
1790                  */
1791                 rc = filemap_write_and_wait(inode->i_mapping);
1792                 if (rc != 0) {
1793                         cifsInode->write_behind_rc = rc;
1794                         rc = 0;
1795                 }
1796         }
1797
1798         if (attrs->ia_valid & ATTR_SIZE) {
1799                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1800                 if (rc != 0)
1801                         goto cifs_setattr_exit;
1802         }
1803
1804         /*
1805          * Without unix extensions we can't send ownership changes to the
1806          * server, so silently ignore them. This is consistent with how
1807          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1808          * CIFSACL support + proper Windows to Unix idmapping, we may be
1809          * able to support this in the future.
1810          */
1811         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1812                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1813
1814         /* skip mode change if it's just for clearing setuid/setgid */
1815         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1816                 attrs->ia_valid &= ~ATTR_MODE;
1817
1818         if (attrs->ia_valid & ATTR_MODE) {
1819                 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1820                 mode = attrs->ia_mode;
1821         }
1822
1823         if (attrs->ia_valid & ATTR_MODE) {
1824                 rc = 0;
1825 #ifdef CONFIG_CIFS_EXPERIMENTAL
1826                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1827                         rc = mode_to_acl(inode, full_path, mode);
1828                 else
1829 #endif
1830                 if (((mode & S_IWUGO) == 0) &&
1831                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1832
1833                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1834
1835                         /* fix up mode if we're not using dynperm */
1836                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1837                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1838                 } else if ((mode & S_IWUGO) &&
1839                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
1840
1841                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1842                         /* Attributes of 0 are ignored */
1843                         if (dosattr == 0)
1844                                 dosattr |= ATTR_NORMAL;
1845
1846                         /* reset local inode permissions to normal */
1847                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1848                                 attrs->ia_mode &= ~(S_IALLUGO);
1849                                 if (S_ISDIR(inode->i_mode))
1850                                         attrs->ia_mode |=
1851                                                 cifs_sb->mnt_dir_mode;
1852                                 else
1853                                         attrs->ia_mode |=
1854                                                 cifs_sb->mnt_file_mode;
1855                         }
1856                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1857                         /* ignore mode change - ATTR_READONLY hasn't changed */
1858                         attrs->ia_valid &= ~ATTR_MODE;
1859                 }
1860         }
1861
1862         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1863             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1864                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1865                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1866
1867                 /* Even if error on time set, no sense failing the call if
1868                 the server would set the time to a reasonable value anyway,
1869                 and this check ensures that we are not being called from
1870                 sys_utimes in which case we ought to fail the call back to
1871                 the user when the server rejects the call */
1872                 if ((rc) && (attrs->ia_valid &
1873                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1874                         rc = 0;
1875         }
1876
1877         /* do not need local check to inode_check_ok since the server does
1878            that */
1879         if (!rc)
1880                 rc = inode_setattr(inode, attrs);
1881 cifs_setattr_exit:
1882         kfree(full_path);
1883         FreeXid(xid);
1884         return rc;
1885 }
1886
1887 int
1888 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1889 {
1890         struct inode *inode = direntry->d_inode;
1891         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1892         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1893
1894         if (pTcon->unix_ext)
1895                 return cifs_setattr_unix(direntry, attrs);
1896
1897         return cifs_setattr_nounix(direntry, attrs);
1898
1899         /* BB: add cifs_setattr_legacy for really old servers */
1900 }
1901
1902 #if 0
1903 void cifs_delete_inode(struct inode *inode)
1904 {
1905         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1906         /* may have to add back in if and when safe distributed caching of
1907            directories added e.g. via FindNotify */
1908 }
1909 #endif