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                         inode->i_mode &= ~S_IFMT;
 550         }
 551         /* clear write bits if ATTR_READONLY is set */
 552         if (attr & ATTR_READONLY)
 553                 inode->i_mode &= ~S_IWUGO;
 554
 555         /* set inode type */
 556         if ((attr & ATTR_SYSTEM) &&
 557             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
 558                 /* no need to fix endianness on 0 */
 559                 if (pfindData->EndOfFile == 0)
 560                         inode->i_mode |= S_IFIFO;
 561                 else if (decode_sfu_inode(inode,
 562                                 le64_to_cpu(pfindData->EndOfFile),
 563                                 full_path, cifs_sb, xid))
 564                         cFYI(1, ("unknown SFU file type\n"));
 565         } else {
 566                 if (attr & ATTR_DIRECTORY)
 567                         inode->i_mode |= S_IFDIR;
 568                 else
 569                         inode->i_mode |= S_IFREG;
 570         }
 571
 572         spin_lock(&inode->i_lock);
 573         if (is_size_safe_to_change(cifsInfo,
 574                                    le64_to_cpu(pfindData->EndOfFile))) {
 575                 /* can not safely shrink the file size here if the
 576                    client is writing to it due to potential races */
 577                 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
 578
 579                 /* 512 bytes (2**9) is the fake blocksize that must be
 580                    used for this calculation */
 581                 inode->i_blocks = (512 - 1 + le64_to_cpu(
 582                                    pfindData->AllocationSize)) >> 9;
 583         }
 584         spin_unlock(&inode->i_lock);
 585
 586         inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 587
 588         /* BB fill in uid and gid here? with help from winbind?
 589            or retrieve from NTFS stream extended attribute */
 590 #ifdef CONFIG_CIFS_EXPERIMENTAL
 591         /* fill in 0777 bits from ACL */
 592         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 593                 cFYI(1, ("Getting mode bits from ACL"));
 594                 acl_to_uid_mode(inode, full_path, pfid);
 595         }
 596 #endif
 597         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 598                 /* fill in remaining high mode bits e.g. SUID, VTX */
 599                 get_sfu_mode(inode, full_path, cifs_sb, xid);
 600         } else if (atomic_read(&cifsInfo->inUse) == 0) {
 601                 inode->i_uid = cifs_sb->mnt_uid;
 602                 inode->i_gid = cifs_sb->mnt_gid;
 603                 /* set so we do not keep refreshing these fields with
 604                    bad data after user has changed them in memory */
 605                 atomic_set(&cifsInfo->inUse, 1);
 606         }
 607
 608         cifs_set_ops(inode, is_dfs_referral);
 609
 610
 611
 612
 613 cgii_exit:
 614         kfree(buf);
 615         return rc;
 616 }
 617
 618 static const struct inode_operations cifs_ipc_inode_ops = {
 619         .lookup = cifs_lookup,
 620 };
 621
 622 /* gets root inode */
 623 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
 624 {
 625         int xid;
 626         struct cifs_sb_info *cifs_sb;
 627         struct inode *inode;
 628         long rc;
 629
 630         inode = iget_locked(sb, ino);
 631         if (!inode)
 632                 return ERR_PTR(-ENOMEM);
 633         if (!(inode->i_state & I_NEW))
 634                 return inode;
 635
 636         cifs_sb = CIFS_SB(inode->i_sb);
 637         xid = GetXid();
 638
 639         if (cifs_sb->tcon->unix_ext)
 640                 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
 641         else
 642                 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
 643                                          NULL);
 644         if (rc && cifs_sb->tcon->ipc) {
 645                 cFYI(1, ("ipc connection - fake read inode"));
 646                 inode->i_mode |= S_IFDIR;
 647                 inode->i_nlink = 2;
 648                 inode->i_op = &cifs_ipc_inode_ops;
 649                 inode->i_fop = &simple_dir_operations;
 650                 inode->i_uid = cifs_sb->mnt_uid;
 651                 inode->i_gid = cifs_sb->mnt_gid;
 652         } else if (rc) {
 653                 _FreeXid(xid);
 654                 iget_failed(inode);
 655                 return ERR_PTR(rc);
 656         }
 657
 658         unlock_new_inode(inode);
 659
 660         /* can not call macro FreeXid here since in a void func
 661          * TODO: This is no longer true
 662          */
 663         _FreeXid(xid);
 664         return inode;
 665 }
 666
 667 int cifs_unlink(struct inode *inode, struct dentry *direntry)
 668 {
 669         int rc = 0;
 670         int xid;
 671         struct cifs_sb_info *cifs_sb;
 672         struct cifsTconInfo *pTcon;
 673         char *full_path = NULL;
 674         struct cifsInodeInfo *cifsInode;
 675         FILE_BASIC_INFO *pinfo_buf;
 676
 677         cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
 678
 679         xid = GetXid();
 680
 681         if (inode)
 682                 cifs_sb = CIFS_SB(inode->i_sb);
 683         else
 684                 cifs_sb = CIFS_SB(direntry->d_sb);
 685         pTcon = cifs_sb->tcon;
 686
 687         /* Unlink can be called from rename so we can not grab the sem here
 688            since we deadlock otherwise */
 689 /*      mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
 690         full_path = build_path_from_dentry(direntry);
 691 /*      mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
 692         if (full_path == NULL) {
 693                 FreeXid(xid);
 694                 return -ENOMEM;
 695         }
 696
 697         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 698                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 699                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 700                 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
 701                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 702                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 703                 cFYI(1, ("posix del rc %d", rc));
 704                 if ((rc == 0) || (rc == -ENOENT))
 705                         goto psx_del_no_retry;
 706         }
 707
 708         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
 709                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 710 psx_del_no_retry:
 711         if (!rc) {
 712                 if (direntry->d_inode)
 713                         drop_nlink(direntry->d_inode);
 714         } else if (rc == -ENOENT) {
 715                 d_drop(direntry);
 716         } else if (rc == -ETXTBSY) {
 717                 int oplock = 0;
 718                 __u16 netfid;
 719
 720                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
 721                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
 722                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
 723                                  cifs_sb->mnt_cifs_flags &
 724                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 725                 if (rc == 0) {
 726                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
 727                                               cifs_sb->local_nls,
 728                                               cifs_sb->mnt_cifs_flags &
 729                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 730                         CIFSSMBClose(xid, pTcon, netfid);
 731                         if (direntry->d_inode)
 732                                 drop_nlink(direntry->d_inode);
 733                 }
 734         } else if (rc == -EACCES) {
 735                 /* try only if r/o attribute set in local lookup data? */
 736                 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
 737                 if (pinfo_buf) {
 738                         /* ATTRS set to normal clears r/o bit */
 739                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
 740                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
 741                                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
 742                                                      pinfo_buf,
 743                                                      cifs_sb->local_nls,
 744                                                      cifs_sb->mnt_cifs_flags &
 745                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 746                         else
 747                                 rc = -EOPNOTSUPP;
 748
 749                         if (rc == -EOPNOTSUPP) {
 750                                 int oplock = 0;
 751                                 __u16 netfid;
 752                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
 753                                                           full_path,
 754                                                           (__u16)ATTR_NORMAL,
 755                                                           cifs_sb->local_nls);
 756                            For some strange reason it seems that NT4 eats the
 757                            old setattr call without actually setting the
 758                            attributes so on to the third attempted workaround
 759                            */
 760
 761                         /* BB could scan to see if we already have it open
 762                            and pass in pid of opener to function */
 763                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 764                                                  FILE_OPEN, SYNCHRONIZE |
 765                                                  FILE_WRITE_ATTRIBUTES, 0,
 766                                                  &netfid, &oplock, NULL,
 767                                                  cifs_sb->local_nls,
 768                                                  cifs_sb->mnt_cifs_flags &
 769                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 770                                 if (rc == 0) {
 771                                         rc = CIFSSMBSetFileInfo(xid, pTcon,
 772                                                                 pinfo_buf,
 773                                                                 netfid,
 774                                                                 current->tgid);
 775                                         CIFSSMBClose(xid, pTcon, netfid);
 776                                 }
 777                         }
 778                         kfree(pinfo_buf);
 779                 }
 780                 if (rc == 0) {
 781                         rc = CIFSSMBDelFile(xid, pTcon, full_path,
 782                                             cifs_sb->local_nls,
 783                                             cifs_sb->mnt_cifs_flags &
 784                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 785                         if (!rc) {
 786                                 if (direntry->d_inode)
 787                                         drop_nlink(direntry->d_inode);
 788                         } else if (rc == -ETXTBSY) {
 789                                 int oplock = 0;
 790                                 __u16 netfid;
 791
 792                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 793                                                  FILE_OPEN, DELETE,
 794                                                  CREATE_NOT_DIR |
 795                                                  CREATE_DELETE_ON_CLOSE,
 796                                                  &netfid, &oplock, NULL,
 797                                                  cifs_sb->local_nls,
 798                                                  cifs_sb->mnt_cifs_flags &
 799                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 800                                 if (rc == 0) {
 801                                         CIFSSMBRenameOpenFile(xid, pTcon,
 802                                                 netfid, NULL,
 803                                                 cifs_sb->local_nls,
 804                                                 cifs_sb->mnt_cifs_flags &
 805                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 806                                         CIFSSMBClose(xid, pTcon, netfid);
 807                                         if (direntry->d_inode)
 808                                                 drop_nlink(direntry->d_inode);
 809                                 }
 810                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
 811                         }
 812                 }
 813         }
 814         if (direntry->d_inode) {
 815                 cifsInode = CIFS_I(direntry->d_inode);
 816                 cifsInode->time = 0;    /* will force revalidate to get info
 817                                            when needed */
 818                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
 819         }
 820         if (inode) {
 821                 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
 822                 cifsInode = CIFS_I(inode);
 823                 cifsInode->time = 0;    /* force revalidate of dir as well */
 824         }
 825
 826         kfree(full_path);
 827         FreeXid(xid);
 828         return rc;
 829 }
 830
 831 static void posix_fill_in_inode(struct inode *tmp_inode,
 832         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 833 {
 834         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 835         loff_t local_size;
 836         struct timespec local_mtime;
 837
 838         cifsInfo->time = jiffies;
 839         atomic_inc(&cifsInfo->inUse);
 840
 841         /* save mtime and size */
 842         local_mtime = tmp_inode->i_mtime;
 843         local_size  = tmp_inode->i_size;
 844
 845         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 846         cifs_set_ops(tmp_inode, false);
 847
 848         if (!S_ISREG(tmp_inode->i_mode))
 849                 return;
 850
 851         /*
 852          * No sense invalidating pages for new inode
 853          * since we we have not started caching
 854          * readahead file data yet.
 855          */
 856         if (isNewInode)
 857                 return;
 858
 859         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 860                 (local_size == tmp_inode->i_size)) {
 861                 cFYI(1, ("inode exists but unchanged"));
 862         } else {
 863                 /* file may have changed on server */
 864                 cFYI(1, ("invalidate inode, readdir detected change"));
 865                 invalidate_remote_inode(tmp_inode);
 866         }
 867 }
 868
 869 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 870 {
 871         int rc = 0;
 872         int xid;
 873         struct cifs_sb_info *cifs_sb;
 874         struct cifsTconInfo *pTcon;
 875         char *full_path = NULL;
 876         struct inode *newinode = NULL;
 877
 878         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 879
 880         xid = GetXid();
 881
 882         cifs_sb = CIFS_SB(inode->i_sb);
 883         pTcon = cifs_sb->tcon;
 884
 885         full_path = build_path_from_dentry(direntry);
 886         if (full_path == NULL) {
 887                 FreeXid(xid);
 888                 return -ENOMEM;
 889         }
 890
 891         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 892                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 893                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 894                 u32 oplock = 0;
 895                 FILE_UNIX_BASIC_INFO *pInfo =
 896                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 897                 if (pInfo == NULL) {
 898                         rc = -ENOMEM;
 899                         goto mkdir_out;
 900                 }
 901
 902                 mode &= ~current->fs->umask;
 903                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
 904                                 mode, NULL /* netfid */, pInfo, &oplock,
 905                                 full_path, cifs_sb->local_nls,
 906                                 cifs_sb->mnt_cifs_flags &
 907                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 908                 if (rc == -EOPNOTSUPP) {
 909                         kfree(pInfo);
 910                         goto mkdir_retry_old;
 911                 } else if (rc) {
 912                         cFYI(1, ("posix mkdir returned 0x%x", rc));
 913                         d_drop(direntry);
 914                 } else {
 915                         if (pInfo->Type == cpu_to_le32(-1)) {
 916                                 /* no return info, go query for it */
 917                                 kfree(pInfo);
 918                                 goto mkdir_get_info;
 919                         }
 920 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
 921         to set uid/gid */
 922                         inc_nlink(inode);
 923                         if (pTcon->nocase)
 924                                 direntry->d_op = &cifs_ci_dentry_ops;
 925                         else
 926                                 direntry->d_op = &cifs_dentry_ops;
 927
 928                         newinode = new_inode(inode->i_sb);
 929                         if (newinode == NULL) {
 930                                 kfree(pInfo);
 931                                 goto mkdir_get_info;
 932                         }
 933                         /* Is an i_ino of zero legal? */
 934                         /* Are there sanity checks we can use to ensure that
 935                            the server is really filling in that field? */
 936                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 937                                 newinode->i_ino =
 938                                         (unsigned long)pInfo->UniqueId;
 939                         } /* note ino incremented to unique num in new_inode */
 940                         if (inode->i_sb->s_flags & MS_NOATIME)
 941                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
 942                         newinode->i_nlink = 2;
 943
 944                         insert_inode_hash(newinode);
 945                         d_instantiate(direntry, newinode);
 946
 947                         /* we already checked in POSIXCreate whether
 948                            frame was long enough */
 949                         posix_fill_in_inode(direntry->d_inode,
 950                                         pInfo, 1 /* NewInode */);
 951 #ifdef CONFIG_CIFS_DEBUG2
 952                         cFYI(1, ("instantiated dentry %p %s to inode %p",
 953                                 direntry, direntry->d_name.name, newinode));
 954
 955                         if (newinode->i_nlink != 2)
 956                                 cFYI(1, ("unexpected number of links %d",
 957                                         newinode->i_nlink));
 958 #endif
 959                 }
 960                 kfree(pInfo);
 961                 goto mkdir_out;
 962         }
 963 mkdir_retry_old:
 964         /* BB add setting the equivalent of mode via CreateX w/ACLs */
 965         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
 966                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 967         if (rc) {
 968                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
 969                 d_drop(direntry);
 970         } else {
 971 mkdir_get_info:
 972                 inc_nlink(inode);
 973                 if (pTcon->unix_ext)
 974                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 975                                                       inode->i_sb, xid);
 976                 else
 977                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 978                                                  inode->i_sb, xid, NULL);
 979
 980                 if (pTcon->nocase)
 981                         direntry->d_op = &cifs_ci_dentry_ops;
 982                 else
 983                         direntry->d_op = &cifs_dentry_ops;
 984                 d_instantiate(direntry, newinode);
 985                  /* setting nlink not necessary except in cases where we
 986                   * failed to get it from the server or was set bogus */
 987                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
 988                                 direntry->d_inode->i_nlink = 2;
 989
 990                 mode &= ~current->fs->umask;
 991                 /* must turn on setgid bit if parent dir has it */
 992                 if (inode->i_mode & S_ISGID)
 993                         mode |= S_ISGID;
 994
 995                 if (pTcon->unix_ext) {
 996                         struct cifs_unix_set_info_args args = {
 997                                 .mode   = mode,
 998                                 .ctime  = NO_CHANGE_64,
 999                                 .atime  = NO_CHANGE_64,
1000                                 .mtime  = NO_CHANGE_64,
1001                                 .device = 0,
1002                         };
1003                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1004                                 args.uid = (__u64)current->fsuid;
1005                                 if (inode->i_mode & S_ISGID)
1006                                         args.gid = (__u64)inode->i_gid;
1007                                 else
1008                                         args.gid = (__u64)current->fsgid;
1009                         } else {
1010                                 args.uid = NO_CHANGE_64;
1011                                 args.gid = NO_CHANGE_64;
1012                         }
1013                         CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1014                                             cifs_sb->local_nls,
1015                                             cifs_sb->mnt_cifs_flags &
1016                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1017                 } else {
1018                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1019                             (mode & S_IWUGO) == 0) {
1020                                 FILE_BASIC_INFO pInfo;
1021                                 memset(&pInfo, 0, sizeof(pInfo));
1022                                 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
1023                                 CIFSSMBSetPathInfo(xid, pTcon, full_path,
1024                                                 &pInfo, cifs_sb->local_nls,
1025                                                 cifs_sb->mnt_cifs_flags &
1026                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1027                         }
1028                         if (direntry->d_inode) {
1029                                 if (cifs_sb->mnt_cifs_flags &
1030                                      CIFS_MOUNT_DYNPERM)
1031                                         direntry->d_inode->i_mode =
1032                                                 (mode | S_IFDIR);
1033
1034                                 if (cifs_sb->mnt_cifs_flags &
1035                                      CIFS_MOUNT_SET_UID) {
1036                                         direntry->d_inode->i_uid =
1037                                                 current->fsuid;
1038                                         if (inode->i_mode & S_ISGID)
1039                                                 direntry->d_inode->i_gid =
1040                                                         inode->i_gid;
1041                                         else
1042                                                 direntry->d_inode->i_gid =
1043                                                         current->fsgid;
1044                                 }
1045                         }
1046                 }
1047         }
1048 mkdir_out:
1049         kfree(full_path);
1050         FreeXid(xid);
1051         return rc;
1052 }
1053
1054 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1055 {
1056         int rc = 0;
1057         int xid;
1058         struct cifs_sb_info *cifs_sb;
1059         struct cifsTconInfo *pTcon;
1060         char *full_path = NULL;
1061         struct cifsInodeInfo *cifsInode;
1062
1063         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1064
1065         xid = GetXid();
1066
1067         cifs_sb = CIFS_SB(inode->i_sb);
1068         pTcon = cifs_sb->tcon;
1069
1070         full_path = build_path_from_dentry(direntry);
1071         if (full_path == NULL) {
1072                 FreeXid(xid);
1073                 return -ENOMEM;
1074         }
1075
1076         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1077                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1078
1079         if (!rc) {
1080                 drop_nlink(inode);
1081                 spin_lock(&direntry->d_inode->i_lock);
1082                 i_size_write(direntry->d_inode, 0);
1083                 clear_nlink(direntry->d_inode);
1084                 spin_unlock(&direntry->d_inode->i_lock);
1085         }
1086
1087         cifsInode = CIFS_I(direntry->d_inode);
1088         cifsInode->time = 0;    /* force revalidate to go get info when
1089                                    needed */
1090         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1091                 current_fs_time(inode->i_sb);
1092
1093         kfree(full_path);
1094         FreeXid(xid);
1095         return rc;
1096 }
1097
1098 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1099         struct inode *target_inode, struct dentry *target_direntry)
1100 {
1101         char *fromName;
1102         char *toName;
1103         struct cifs_sb_info *cifs_sb_source;
1104         struct cifs_sb_info *cifs_sb_target;
1105         struct cifsTconInfo *pTcon;
1106         int xid;
1107         int rc = 0;
1108
1109         xid = GetXid();
1110
1111         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1112         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1113         pTcon = cifs_sb_source->tcon;
1114
1115         if (pTcon != cifs_sb_target->tcon) {
1116                 FreeXid(xid);
1117                 return -EXDEV;  /* BB actually could be allowed if same server,
1118                                    but different share.
1119                                    Might eventually add support for this */
1120         }
1121
1122         /* we already  have the rename sem so we do not need to grab it again
1123            here to protect the path integrity */
1124         fromName = build_path_from_dentry(source_direntry);
1125         toName = build_path_from_dentry(target_direntry);
1126         if ((fromName == NULL) || (toName == NULL)) {
1127                 rc = -ENOMEM;
1128                 goto cifs_rename_exit;
1129         }
1130
1131         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1132                            cifs_sb_source->local_nls,
1133                            cifs_sb_source->mnt_cifs_flags &
1134                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1135         if (rc == -EEXIST) {
1136                 /* check if they are the same file because rename of hardlinked
1137                    files is a noop */
1138                 FILE_UNIX_BASIC_INFO *info_buf_source;
1139                 FILE_UNIX_BASIC_INFO *info_buf_target;
1140
1141                 info_buf_source =
1142                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1143                 if (info_buf_source != NULL) {
1144                         info_buf_target = info_buf_source + 1;
1145                         if (pTcon->unix_ext)
1146                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1147                                         info_buf_source,
1148                                         cifs_sb_source->local_nls,
1149                                         cifs_sb_source->mnt_cifs_flags &
1150                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1151                         /* else rc is still EEXIST so will fall through to
1152                            unlink the target and retry rename */
1153                         if (rc == 0) {
1154                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1155                                                 info_buf_target,
1156                                                 cifs_sb_target->local_nls,
1157                                                 /* remap based on source sb */
1158                                                 cifs_sb_source->mnt_cifs_flags &
1159                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
1160                         }
1161                         if ((rc == 0) &&
1162                             (info_buf_source->UniqueId ==
1163                              info_buf_target->UniqueId)) {
1164                         /* do not rename since the files are hardlinked which
1165                            is a noop */
1166                         } else {
1167                         /* we either can not tell the files are hardlinked
1168                            (as with Windows servers) or files are not
1169                            hardlinked so delete the target manually before
1170                            renaming to follow POSIX rather than Windows
1171                            semantics */
1172                                 cifs_unlink(target_inode, target_direntry);
1173                                 rc = CIFSSMBRename(xid, pTcon, fromName,
1174                                                    toName,
1175                                                    cifs_sb_source->local_nls,
1176                                                    cifs_sb_source->mnt_cifs_flags
1177                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
1178                         }
1179                         kfree(info_buf_source);
1180                 } /* if we can not get memory just leave rc as EEXIST */
1181         }
1182
1183         if (rc)
1184                 cFYI(1, ("rename rc %d", rc));
1185
1186         if ((rc == -EIO) || (rc == -EEXIST)) {
1187                 int oplock = 0;
1188                 __u16 netfid;
1189
1190                 /* BB FIXME Is Generic Read correct for rename? */
1191                 /* if renaming directory - we should not say CREATE_NOT_DIR,
1192                    need to test renaming open directory, also GENERIC_READ
1193                    might not right be right access to request */
1194                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1195                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
1196                                  cifs_sb_source->local_nls,
1197                                  cifs_sb_source->mnt_cifs_flags &
1198                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1199                 if (rc == 0) {
1200                         rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1201                                               cifs_sb_source->local_nls,
1202                                               cifs_sb_source->mnt_cifs_flags &
1203                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1204                         CIFSSMBClose(xid, pTcon, netfid);
1205                 }
1206         }
1207
1208 cifs_rename_exit:
1209         kfree(fromName);
1210         kfree(toName);
1211         FreeXid(xid);
1212         return rc;
1213 }
1214
1215 int cifs_revalidate(struct dentry *direntry)
1216 {
1217         int xid;
1218         int rc = 0, wbrc = 0;
1219         char *full_path;
1220         struct cifs_sb_info *cifs_sb;
1221         struct cifsInodeInfo *cifsInode;
1222         loff_t local_size;
1223         struct timespec local_mtime;
1224         bool invalidate_inode = false;
1225
1226         if (direntry->d_inode == NULL)
1227                 return -ENOENT;
1228
1229         cifsInode = CIFS_I(direntry->d_inode);
1230
1231         if (cifsInode == NULL)
1232                 return -ENOENT;
1233
1234         /* no sense revalidating inode info on file that no one can write */
1235         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1236                 return rc;
1237
1238         xid = GetXid();
1239
1240         cifs_sb = CIFS_SB(direntry->d_sb);
1241
1242         /* can not safely grab the rename sem here if rename calls revalidate
1243            since that would deadlock */
1244         full_path = build_path_from_dentry(direntry);
1245         if (full_path == NULL) {
1246                 FreeXid(xid);
1247                 return -ENOMEM;
1248         }
1249         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1250                  "jiffies %ld", full_path, direntry->d_inode,
1251                  direntry->d_inode->i_count.counter, direntry,
1252                  direntry->d_time, jiffies));
1253
1254         if (cifsInode->time == 0) {
1255                 /* was set to zero previously to force revalidate */
1256         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1257                    lookupCacheEnabled) {
1258                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1259                     (direntry->d_inode->i_nlink == 1)) {
1260                         kfree(full_path);
1261                         FreeXid(xid);
1262                         return rc;
1263                 } else {
1264                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1265                 }
1266         }
1267
1268         /* save mtime and size */
1269         local_mtime = direntry->d_inode->i_mtime;
1270         local_size = direntry->d_inode->i_size;
1271
1272         if (cifs_sb->tcon->unix_ext) {
1273                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1274                                               direntry->d_sb, xid);
1275                 if (rc) {
1276                         cFYI(1, ("error on getting revalidate info %d", rc));
1277 /*                      if (rc != -ENOENT)
1278                                 rc = 0; */      /* BB should we cache info on
1279                                                    certain errors? */
1280                 }
1281         } else {
1282                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1283                                          direntry->d_sb, xid, NULL);
1284                 if (rc) {
1285                         cFYI(1, ("error on getting revalidate info %d", rc));
1286 /*                      if (rc != -ENOENT)
1287                                 rc = 0; */      /* BB should we cache info on
1288                                                    certain errors? */
1289                 }
1290         }
1291         /* should we remap certain errors, access denied?, to zero */
1292
1293         /* if not oplocked, we invalidate inode pages if mtime or file size
1294            had changed on server */
1295
1296         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1297             (local_size == direntry->d_inode->i_size)) {
1298                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1299         } else {
1300                 /* file may have changed on server */
1301                 if (cifsInode->clientCanCacheRead) {
1302                         /* no need to invalidate inode pages since we were the
1303                            only ones who could have modified the file and the
1304                            server copy is staler than ours */
1305                 } else {
1306                         invalidate_inode = true;
1307                 }
1308         }
1309
1310         /* can not grab this sem since kernel filesys locking documentation
1311            indicates i_mutex may be taken by the kernel on lookup and rename
1312            which could deadlock if we grab the i_mutex here as well */
1313 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1314         /* need to write out dirty pages here  */
1315         if (direntry->d_inode->i_mapping) {
1316                 /* do we need to lock inode until after invalidate completes
1317                    below? */
1318                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1319                 if (wbrc)
1320                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1321         }
1322         if (invalidate_inode) {
1323         /* shrink_dcache not necessary now that cifs dentry ops
1324         are exported for negative dentries */
1325 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1326                         shrink_dcache_parent(direntry); */
1327                 if (S_ISREG(direntry->d_inode->i_mode)) {
1328                         if (direntry->d_inode->i_mapping) {
1329                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1330                                 if (wbrc)
1331                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1332                         }
1333                         /* may eventually have to do this for open files too */
1334                         if (list_empty(&(cifsInode->openFileList))) {
1335                                 /* changed on server - flush read ahead pages */
1336                                 cFYI(1, ("Invalidating read ahead data on "
1337                                          "closed file"));
1338                                 invalidate_remote_inode(direntry->d_inode);
1339                         }
1340                 }
1341         }
1342 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1343
1344         kfree(full_path);
1345         FreeXid(xid);
1346         return rc;
1347 }
1348
1349 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1350         struct kstat *stat)
1351 {
1352         int err = cifs_revalidate(dentry);
1353         if (!err) {
1354                 generic_fillattr(dentry->d_inode, stat);
1355                 stat->blksize = CIFS_MAX_MSGSIZE;
1356         }
1357         return err;
1358 }
1359
1360 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1361 {
1362         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1363         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1364         struct page *page;
1365         int rc = 0;
1366
1367         page = grab_cache_page(mapping, index);
1368         if (!page)
1369                 return -ENOMEM;
1370
1371         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1372         unlock_page(page);
1373         page_cache_release(page);
1374         return rc;
1375 }
1376
1377 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1378 {
1379         struct address_space *mapping = inode->i_mapping;
1380         unsigned long limit;
1381
1382         spin_lock(&inode->i_lock);
1383         if (inode->i_size < offset)
1384                 goto do_expand;
1385         /*
1386          * truncation of in-use swapfiles is disallowed - it would cause
1387          * subsequent swapout to scribble on the now-freed blocks.
1388          */
1389         if (IS_SWAPFILE(inode)) {
1390                 spin_unlock(&inode->i_lock);
1391                 goto out_busy;
1392         }
1393         i_size_write(inode, offset);
1394         spin_unlock(&inode->i_lock);
1395         /*
1396          * unmap_mapping_range is called twice, first simply for efficiency
1397          * so that truncate_inode_pages does fewer single-page unmaps. However
1398          * after this first call, and before truncate_inode_pages finishes,
1399          * it is possible for private pages to be COWed, which remain after
1400          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1401          * call must be made for correctness.
1402          */
1403         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1404         truncate_inode_pages(mapping, offset);
1405         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1406         goto out_truncate;
1407
1408 do_expand:
1409         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1410         if (limit != RLIM_INFINITY && offset > limit) {
1411                 spin_unlock(&inode->i_lock);
1412                 goto out_sig;
1413         }
1414         if (offset > inode->i_sb->s_maxbytes) {
1415                 spin_unlock(&inode->i_lock);
1416                 goto out_big;
1417         }
1418         i_size_write(inode, offset);
1419         spin_unlock(&inode->i_lock);
1420 out_truncate:
1421         if (inode->i_op && inode->i_op->truncate)
1422                 inode->i_op->truncate(inode);
1423         return 0;
1424 out_sig:
1425         send_sig(SIGXFSZ, current, 0);
1426 out_big:
1427         return -EFBIG;
1428 out_busy:
1429         return -ETXTBSY;
1430 }
1431
1432 static int
1433 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1434                    int xid, char *full_path)
1435 {
1436         int rc;
1437         struct cifsFileInfo *open_file;
1438         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1439         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1440         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1441
1442         /*
1443          * To avoid spurious oplock breaks from server, in the case of
1444          * inodes that we already have open, avoid doing path based
1445          * setting of file size if we can do it by handle.
1446          * This keeps our caching token (oplock) and avoids timeouts
1447          * when the local oplock break takes longer to flush
1448          * writebehind data than the SMB timeout for the SetPathInfo
1449          * request would allow
1450          */
1451         open_file = find_writable_file(cifsInode);
1452         if (open_file) {
1453                 __u16 nfid = open_file->netfid;
1454                 __u32 npid = open_file->pid;
1455                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1456                                         npid, false);
1457                 atomic_dec(&open_file->wrtPending);
1458                 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1459                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1460                         unsigned int bytes_written;
1461                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1462                                           &bytes_written, NULL, NULL, 1);
1463                         cFYI(1, ("Wrt seteof rc %d", rc));
1464                 }
1465         } else
1466                 rc = -EINVAL;
1467
1468         if (rc != 0) {
1469                 /* Set file size by pathname rather than by handle
1470                    either because no valid, writeable file handle for
1471                    it was found or because there was an error setting
1472                    it by handle */
1473                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1474                                    false, cifs_sb->local_nls,
1475                                    cifs_sb->mnt_cifs_flags &
1476                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1477                 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1478                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1479                         __u16 netfid;
1480                         int oplock = 0;
1481
1482                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1483                                 FILE_OPEN, GENERIC_WRITE,
1484                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1485                                 cifs_sb->local_nls,
1486                                 cifs_sb->mnt_cifs_flags &
1487                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1488                         if (rc == 0) {
1489                                 unsigned int bytes_written;
1490                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1491                                                   attrs->ia_size,
1492                                                   &bytes_written, NULL,
1493                                                   NULL, 1);
1494                                 cFYI(1, ("wrt seteof rc %d", rc));
1495                                 CIFSSMBClose(xid, pTcon, netfid);
1496                         }
1497                 }
1498         }
1499
1500         if (rc == 0) {
1501                 rc = cifs_vmtruncate(inode, attrs->ia_size);
1502                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1503         }
1504
1505         return rc;
1506 }
1507
1508 static int
1509 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
1510                     char *full_path, __u32 dosattr)
1511 {
1512         int rc;
1513         int oplock = 0;
1514         __u16 netfid;
1515         __u32 netpid;
1516         bool set_time = false;
1517         struct cifsFileInfo *open_file;
1518         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1519         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1520         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1521         FILE_BASIC_INFO info_buf;
1522
1523         if (attrs->ia_valid & ATTR_ATIME) {
1524                 set_time = true;
1525                 info_buf.LastAccessTime =
1526                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1527         } else
1528                 info_buf.LastAccessTime = 0;
1529
1530         if (attrs->ia_valid & ATTR_MTIME) {
1531                 set_time = true;
1532                 info_buf.LastWriteTime =
1533                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1534         } else
1535                 info_buf.LastWriteTime = 0;
1536
1537         /*
1538          * Samba throws this field away, but windows may actually use it.
1539          * Do not set ctime unless other time stamps are changed explicitly
1540          * (i.e. by utimes()) since we would then have a mix of client and
1541          * server times.
1542          */
1543         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1544                 cFYI(1, ("CIFS - CTIME changed"));
1545                 info_buf.ChangeTime =
1546                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1547         } else
1548                 info_buf.ChangeTime = 0;
1549
1550         info_buf.CreationTime = 0;      /* don't change */
1551         info_buf.Attributes = cpu_to_le32(dosattr);
1552
1553         /*
1554          * If the file is already open for write, just use that fileid
1555          */
1556         open_file = find_writable_file(cifsInode);
1557         if (open_file) {
1558                 netfid = open_file->netfid;
1559                 netpid = open_file->pid;
1560                 goto set_via_filehandle;
1561         }
1562
1563         /*
1564          * NT4 apparently returns success on this call, but it doesn't
1565          * really work.
1566          */
1567         if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
1568                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
1569                                      &info_buf, cifs_sb->local_nls,
1570                                      cifs_sb->mnt_cifs_flags &
1571                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1572                 if (rc != -EOPNOTSUPP && rc != -EINVAL)
1573                         goto out;
1574         }
1575
1576         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1577                  "times not supported by this server"));
1578         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1579                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1580                          CREATE_NOT_DIR, &netfid, &oplock,
1581                          NULL, cifs_sb->local_nls,
1582                          cifs_sb->mnt_cifs_flags &
1583                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1584
1585         if (rc != 0) {
1586                 if (rc == -EIO)
1587                         rc = -EINVAL;
1588                 goto out;
1589         }
1590
1591         netpid = current->tgid;
1592
1593 set_via_filehandle:
1594         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
1595         if (open_file == NULL)
1596                 CIFSSMBClose(xid, pTcon, netfid);
1597         else
1598                 atomic_dec(&open_file->wrtPending);
1599 out:
1600         return rc;
1601 }
1602
1603 static int
1604 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1605 {
1606         int rc;
1607         int xid;
1608         char *full_path = NULL;
1609         struct inode *inode = direntry->d_inode;
1610         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1611         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1612         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1613         struct cifs_unix_set_info_args *args = NULL;
1614
1615         cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1616                  direntry->d_name.name, attrs->ia_valid));
1617
1618         xid = GetXid();
1619
1620         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1621                 /* check if we have permission to change attrs */
1622                 rc = inode_change_ok(inode, attrs);
1623                 if (rc < 0)
1624                         goto out;
1625                 else
1626                         rc = 0;
1627         }
1628
1629         full_path = build_path_from_dentry(direntry);
1630         if (full_path == NULL) {
1631                 rc = -ENOMEM;
1632                 goto out;
1633         }
1634
1635         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1636                 /*
1637                    Flush data before changing file size or changing the last
1638                    write time of the file on the server. If the
1639                    flush returns error, store it to report later and continue.
1640                    BB: This should be smarter. Why bother flushing pages that
1641                    will be truncated anyway? Also, should we error out here if
1642                    the flush returns error?
1643                  */
1644                 rc = filemap_write_and_wait(inode->i_mapping);
1645                 if (rc != 0) {
1646                         cifsInode->write_behind_rc = rc;
1647                         rc = 0;
1648                 }
1649         }
1650
1651         if (attrs->ia_valid & ATTR_SIZE) {
1652                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1653                 if (rc != 0)
1654                         goto out;
1655         }
1656
1657         /* skip mode change if it's just for clearing setuid/setgid */
1658         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1659                 attrs->ia_valid &= ~ATTR_MODE;
1660
1661         args = kmalloc(sizeof(*args), GFP_KERNEL);
1662         if (args == NULL) {
1663                 rc = -ENOMEM;
1664                 goto out;
1665         }
1666
1667         /* set up the struct */
1668         if (attrs->ia_valid & ATTR_MODE)
1669                 args->mode = attrs->ia_mode;
1670         else
1671                 args->mode = NO_CHANGE_64;
1672
1673         if (attrs->ia_valid & ATTR_UID)
1674                 args->uid = attrs->ia_uid;
1675         else
1676                 args->uid = NO_CHANGE_64;
1677
1678         if (attrs->ia_valid & ATTR_GID)
1679                 args->gid = attrs->ia_gid;
1680         else
1681                 args->gid = NO_CHANGE_64;
1682
1683         if (attrs->ia_valid & ATTR_ATIME)
1684                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1685         else
1686                 args->atime = NO_CHANGE_64;
1687
1688         if (attrs->ia_valid & ATTR_MTIME)
1689                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1690         else
1691                 args->mtime = NO_CHANGE_64;
1692
1693         if (attrs->ia_valid & ATTR_CTIME)
1694                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1695         else
1696                 args->ctime = NO_CHANGE_64;
1697
1698         args->device = 0;
1699         rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1700                                 cifs_sb->local_nls,
1701                                 cifs_sb->mnt_cifs_flags &
1702                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1703
1704         if (!rc)
1705                 rc = inode_setattr(inode, attrs);
1706 out:
1707         kfree(args);
1708         kfree(full_path);
1709         FreeXid(xid);
1710         return rc;
1711 }
1712
1713 static int
1714 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1715 {
1716         int xid;
1717         struct inode *inode = direntry->d_inode;
1718         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1719         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1720         char *full_path = NULL;
1721         int rc = -EACCES;
1722         __u32 dosattr = 0;
1723         __u64 mode = NO_CHANGE_64;
1724
1725         xid = GetXid();
1726
1727         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1728                  direntry->d_name.name, attrs->ia_valid));
1729
1730         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1731                 /* check if we have permission to change attrs */
1732                 rc = inode_change_ok(inode, attrs);
1733                 if (rc < 0) {
1734                         FreeXid(xid);
1735                         return rc;
1736                 } else
1737                         rc = 0;
1738         }
1739
1740         full_path = build_path_from_dentry(direntry);
1741         if (full_path == NULL) {
1742                 FreeXid(xid);
1743                 return -ENOMEM;
1744         }
1745
1746         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1747                 /*
1748                    Flush data before changing file size or changing the last
1749                    write time of the file on the server. If the
1750                    flush returns error, store it to report later and continue.
1751                    BB: This should be smarter. Why bother flushing pages that
1752                    will be truncated anyway? Also, should we error out here if
1753                    the flush returns error?
1754                  */
1755                 rc = filemap_write_and_wait(inode->i_mapping);
1756                 if (rc != 0) {
1757                         cifsInode->write_behind_rc = rc;
1758                         rc = 0;
1759                 }
1760         }
1761
1762         if (attrs->ia_valid & ATTR_SIZE) {
1763                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1764                 if (rc != 0)
1765                         goto cifs_setattr_exit;
1766         }
1767
1768         /*
1769          * Without unix extensions we can't send ownership changes to the
1770          * server, so silently ignore them. This is consistent with how
1771          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1772          * CIFSACL support + proper Windows to Unix idmapping, we may be
1773          * able to support this in the future.
1774          */
1775         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1776                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1777
1778         /* skip mode change if it's just for clearing setuid/setgid */
1779         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1780                 attrs->ia_valid &= ~ATTR_MODE;
1781
1782         if (attrs->ia_valid & ATTR_MODE) {
1783                 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1784                 mode = attrs->ia_mode;
1785         }
1786
1787         if (attrs->ia_valid & ATTR_MODE) {
1788                 rc = 0;
1789 #ifdef CONFIG_CIFS_EXPERIMENTAL
1790                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1791                         rc = mode_to_acl(inode, full_path, mode);
1792                 else
1793 #endif
1794                 if (((mode & S_IWUGO) == 0) &&
1795                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1796
1797                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1798
1799                         /* fix up mode if we're not using dynperm */
1800                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1801                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1802                 } else if ((mode & S_IWUGO) &&
1803                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
1804
1805                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1806                         /* Attributes of 0 are ignored */
1807                         if (dosattr == 0)
1808                                 dosattr |= ATTR_NORMAL;
1809
1810                         /* reset local inode permissions to normal */
1811                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1812                                 attrs->ia_mode &= ~(S_IALLUGO);
1813                                 if (S_ISDIR(inode->i_mode))
1814                                         attrs->ia_mode |=
1815                                                 cifs_sb->mnt_dir_mode;
1816                                 else
1817                                         attrs->ia_mode |=
1818                                                 cifs_sb->mnt_file_mode;
1819                         }
1820                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1821                         /* ignore mode change - ATTR_READONLY hasn't changed */
1822                         attrs->ia_valid &= ~ATTR_MODE;
1823                 }
1824         }
1825
1826         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1827             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1828                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1829                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1830
1831                 /* Even if error on time set, no sense failing the call if
1832                 the server would set the time to a reasonable value anyway,
1833                 and this check ensures that we are not being called from
1834                 sys_utimes in which case we ought to fail the call back to
1835                 the user when the server rejects the call */
1836                 if ((rc) && (attrs->ia_valid &
1837                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1838                         rc = 0;
1839         }
1840
1841         /* do not need local check to inode_check_ok since the server does
1842            that */
1843         if (!rc)
1844                 rc = inode_setattr(inode, attrs);
1845 cifs_setattr_exit:
1846         kfree(full_path);
1847         FreeXid(xid);
1848         return rc;
1849 }
1850
1851 int
1852 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1853 {
1854         struct inode *inode = direntry->d_inode;
1855         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1856         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1857
1858         if (pTcon->unix_ext)
1859                 return cifs_setattr_unix(direntry, attrs);
1860
1861         return cifs_setattr_nounix(direntry, attrs);
1862
1863         /* BB: add cifs_setattr_legacy for really old servers */
1864 }
1865
1866 #if 0
1867 void cifs_delete_inode(struct inode *inode)
1868 {
1869         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1870         /* may have to add back in if and when safe distributed caching of
1871            directories added e.g. via FindNotify */
1872 }
1873 #endif