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 int cifs_unlink(struct inode *inode, struct dentry *direntry)
 669 {
 670         int rc = 0;
 671         int xid;
 672         struct cifs_sb_info *cifs_sb;
 673         struct cifsTconInfo *pTcon;
 674         char *full_path = NULL;
 675         struct cifsInodeInfo *cifsInode;
 676         FILE_BASIC_INFO *pinfo_buf;
 677
 678         cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
 679
 680         xid = GetXid();
 681
 682         if (inode)
 683                 cifs_sb = CIFS_SB(inode->i_sb);
 684         else
 685                 cifs_sb = CIFS_SB(direntry->d_sb);
 686         pTcon = cifs_sb->tcon;
 687
 688         /* Unlink can be called from rename so we can not grab the sem here
 689            since we deadlock otherwise */
 690 /*      mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
 691         full_path = build_path_from_dentry(direntry);
 692 /*      mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
 693         if (full_path == NULL) {
 694                 FreeXid(xid);
 695                 return -ENOMEM;
 696         }
 697
 698         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 699                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 700                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 701                 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
 702                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 703                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 704                 cFYI(1, ("posix del rc %d", rc));
 705                 if ((rc == 0) || (rc == -ENOENT))
 706                         goto psx_del_no_retry;
 707         }
 708
 709         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
 710                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 711 psx_del_no_retry:
 712         if (!rc) {
 713                 if (direntry->d_inode)
 714                         drop_nlink(direntry->d_inode);
 715         } else if (rc == -ENOENT) {
 716                 d_drop(direntry);
 717         } else if (rc == -ETXTBSY) {
 718                 int oplock = 0;
 719                 __u16 netfid;
 720
 721                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
 722                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
 723                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
 724                                  cifs_sb->mnt_cifs_flags &
 725                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 726                 if (rc == 0) {
 727                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
 728                                               cifs_sb->local_nls,
 729                                               cifs_sb->mnt_cifs_flags &
 730                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 731                         CIFSSMBClose(xid, pTcon, netfid);
 732                         if (direntry->d_inode)
 733                                 drop_nlink(direntry->d_inode);
 734                 }
 735         } else if (rc == -EACCES) {
 736                 /* try only if r/o attribute set in local lookup data? */
 737                 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
 738                 if (pinfo_buf) {
 739                         /* ATTRS set to normal clears r/o bit */
 740                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
 741                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
 742                                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
 743                                                      pinfo_buf,
 744                                                      cifs_sb->local_nls,
 745                                                      cifs_sb->mnt_cifs_flags &
 746                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 747                         else
 748                                 rc = -EOPNOTSUPP;
 749
 750                         if (rc == -EOPNOTSUPP) {
 751                                 int oplock = 0;
 752                                 __u16 netfid;
 753                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
 754                                                           full_path,
 755                                                           (__u16)ATTR_NORMAL,
 756                                                           cifs_sb->local_nls);
 757                            For some strange reason it seems that NT4 eats the
 758                            old setattr call without actually setting the
 759                            attributes so on to the third attempted workaround
 760                            */
 761
 762                         /* BB could scan to see if we already have it open
 763                            and pass in pid of opener to function */
 764                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 765                                                  FILE_OPEN, SYNCHRONIZE |
 766                                                  FILE_WRITE_ATTRIBUTES, 0,
 767                                                  &netfid, &oplock, NULL,
 768                                                  cifs_sb->local_nls,
 769                                                  cifs_sb->mnt_cifs_flags &
 770                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 771                                 if (rc == 0) {
 772                                         rc = CIFSSMBSetFileInfo(xid, pTcon,
 773                                                                 pinfo_buf,
 774                                                                 netfid,
 775                                                                 current->tgid);
 776                                         CIFSSMBClose(xid, pTcon, netfid);
 777                                 }
 778                         }
 779                         kfree(pinfo_buf);
 780                 }
 781                 if (rc == 0) {
 782                         rc = CIFSSMBDelFile(xid, pTcon, full_path,
 783                                             cifs_sb->local_nls,
 784                                             cifs_sb->mnt_cifs_flags &
 785                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 786                         if (!rc) {
 787                                 if (direntry->d_inode)
 788                                         drop_nlink(direntry->d_inode);
 789                         } else if (rc == -ETXTBSY) {
 790                                 int oplock = 0;
 791                                 __u16 netfid;
 792
 793                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 794                                                  FILE_OPEN, DELETE,
 795                                                  CREATE_NOT_DIR |
 796                                                  CREATE_DELETE_ON_CLOSE,
 797                                                  &netfid, &oplock, NULL,
 798                                                  cifs_sb->local_nls,
 799                                                  cifs_sb->mnt_cifs_flags &
 800                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 801                                 if (rc == 0) {
 802                                         CIFSSMBRenameOpenFile(xid, pTcon,
 803                                                 netfid, NULL,
 804                                                 cifs_sb->local_nls,
 805                                                 cifs_sb->mnt_cifs_flags &
 806                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 807                                         CIFSSMBClose(xid, pTcon, netfid);
 808                                         if (direntry->d_inode)
 809                                                 drop_nlink(direntry->d_inode);
 810                                 }
 811                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
 812                         }
 813                 }
 814         }
 815         if (direntry->d_inode) {
 816                 cifsInode = CIFS_I(direntry->d_inode);
 817                 cifsInode->time = 0;    /* will force revalidate to get info
 818                                            when needed */
 819                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
 820         }
 821         if (inode) {
 822                 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
 823                 cifsInode = CIFS_I(inode);
 824                 cifsInode->time = 0;    /* force revalidate of dir as well */
 825         }
 826
 827         kfree(full_path);
 828         FreeXid(xid);
 829         return rc;
 830 }
 831
 832 static void posix_fill_in_inode(struct inode *tmp_inode,
 833         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 834 {
 835         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 836         loff_t local_size;
 837         struct timespec local_mtime;
 838
 839         cifsInfo->time = jiffies;
 840         atomic_inc(&cifsInfo->inUse);
 841
 842         /* save mtime and size */
 843         local_mtime = tmp_inode->i_mtime;
 844         local_size  = tmp_inode->i_size;
 845
 846         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 847         cifs_set_ops(tmp_inode, false);
 848
 849         if (!S_ISREG(tmp_inode->i_mode))
 850                 return;
 851
 852         /*
 853          * No sense invalidating pages for new inode
 854          * since we we have not started caching
 855          * readahead file data yet.
 856          */
 857         if (isNewInode)
 858                 return;
 859
 860         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 861                 (local_size == tmp_inode->i_size)) {
 862                 cFYI(1, ("inode exists but unchanged"));
 863         } else {
 864                 /* file may have changed on server */
 865                 cFYI(1, ("invalidate inode, readdir detected change"));
 866                 invalidate_remote_inode(tmp_inode);
 867         }
 868 }
 869
 870 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 871 {
 872         int rc = 0;
 873         int xid;
 874         struct cifs_sb_info *cifs_sb;
 875         struct cifsTconInfo *pTcon;
 876         char *full_path = NULL;
 877         struct inode *newinode = NULL;
 878
 879         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 880
 881         xid = GetXid();
 882
 883         cifs_sb = CIFS_SB(inode->i_sb);
 884         pTcon = cifs_sb->tcon;
 885
 886         full_path = build_path_from_dentry(direntry);
 887         if (full_path == NULL) {
 888                 FreeXid(xid);
 889                 return -ENOMEM;
 890         }
 891
 892         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 893                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 894                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 895                 u32 oplock = 0;
 896                 FILE_UNIX_BASIC_INFO *pInfo =
 897                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 898                 if (pInfo == NULL) {
 899                         rc = -ENOMEM;
 900                         goto mkdir_out;
 901                 }
 902
 903                 mode &= ~current->fs->umask;
 904                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
 905                                 mode, NULL /* netfid */, pInfo, &oplock,
 906                                 full_path, cifs_sb->local_nls,
 907                                 cifs_sb->mnt_cifs_flags &
 908                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 909                 if (rc == -EOPNOTSUPP) {
 910                         kfree(pInfo);
 911                         goto mkdir_retry_old;
 912                 } else if (rc) {
 913                         cFYI(1, ("posix mkdir returned 0x%x", rc));
 914                         d_drop(direntry);
 915                 } else {
 916                         if (pInfo->Type == cpu_to_le32(-1)) {
 917                                 /* no return info, go query for it */
 918                                 kfree(pInfo);
 919                                 goto mkdir_get_info;
 920                         }
 921 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
 922         to set uid/gid */
 923                         inc_nlink(inode);
 924                         if (pTcon->nocase)
 925                                 direntry->d_op = &cifs_ci_dentry_ops;
 926                         else
 927                                 direntry->d_op = &cifs_dentry_ops;
 928
 929                         newinode = new_inode(inode->i_sb);
 930                         if (newinode == NULL) {
 931                                 kfree(pInfo);
 932                                 goto mkdir_get_info;
 933                         }
 934                         /* Is an i_ino of zero legal? */
 935                         /* Are there sanity checks we can use to ensure that
 936                            the server is really filling in that field? */
 937                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 938                                 newinode->i_ino =
 939                                         (unsigned long)pInfo->UniqueId;
 940                         } /* note ino incremented to unique num in new_inode */
 941                         if (inode->i_sb->s_flags & MS_NOATIME)
 942                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
 943                         newinode->i_nlink = 2;
 944
 945                         insert_inode_hash(newinode);
 946                         d_instantiate(direntry, newinode);
 947
 948                         /* we already checked in POSIXCreate whether
 949                            frame was long enough */
 950                         posix_fill_in_inode(direntry->d_inode,
 951                                         pInfo, 1 /* NewInode */);
 952 #ifdef CONFIG_CIFS_DEBUG2
 953                         cFYI(1, ("instantiated dentry %p %s to inode %p",
 954                                 direntry, direntry->d_name.name, newinode));
 955
 956                         if (newinode->i_nlink != 2)
 957                                 cFYI(1, ("unexpected number of links %d",
 958                                         newinode->i_nlink));
 959 #endif
 960                 }
 961                 kfree(pInfo);
 962                 goto mkdir_out;
 963         }
 964 mkdir_retry_old:
 965         /* BB add setting the equivalent of mode via CreateX w/ACLs */
 966         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
 967                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 968         if (rc) {
 969                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
 970                 d_drop(direntry);
 971         } else {
 972 mkdir_get_info:
 973                 inc_nlink(inode);
 974                 if (pTcon->unix_ext)
 975                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 976                                                       inode->i_sb, xid);
 977                 else
 978                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 979                                                  inode->i_sb, xid, NULL);
 980
 981                 if (pTcon->nocase)
 982                         direntry->d_op = &cifs_ci_dentry_ops;
 983                 else
 984                         direntry->d_op = &cifs_dentry_ops;
 985                 d_instantiate(direntry, newinode);
 986                  /* setting nlink not necessary except in cases where we
 987                   * failed to get it from the server or was set bogus */
 988                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
 989                                 direntry->d_inode->i_nlink = 2;
 990
 991                 mode &= ~current->fs->umask;
 992                 /* must turn on setgid bit if parent dir has it */
 993                 if (inode->i_mode & S_ISGID)
 994                         mode |= S_ISGID;
 995
 996                 if (pTcon->unix_ext) {
 997                         struct cifs_unix_set_info_args args = {
 998                                 .mode   = mode,
 999                                 .ctime  = NO_CHANGE_64,
1000                                 .atime  = NO_CHANGE_64,
1001                                 .mtime  = NO_CHANGE_64,
1002                                 .device = 0,
1003                         };
1004                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1005                                 args.uid = (__u64)current->fsuid;
1006                                 if (inode->i_mode & S_ISGID)
1007                                         args.gid = (__u64)inode->i_gid;
1008                                 else
1009                                         args.gid = (__u64)current->fsgid;
1010                         } else {
1011                                 args.uid = NO_CHANGE_64;
1012                                 args.gid = NO_CHANGE_64;
1013                         }
1014                         CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1015                                             cifs_sb->local_nls,
1016                                             cifs_sb->mnt_cifs_flags &
1017                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1018                 } else {
1019                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1020                             (mode & S_IWUGO) == 0) {
1021                                 FILE_BASIC_INFO pInfo;
1022                                 memset(&pInfo, 0, sizeof(pInfo));
1023                                 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
1024                                 CIFSSMBSetPathInfo(xid, pTcon, full_path,
1025                                                 &pInfo, cifs_sb->local_nls,
1026                                                 cifs_sb->mnt_cifs_flags &
1027                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1028                         }
1029                         if (direntry->d_inode) {
1030                                 if (cifs_sb->mnt_cifs_flags &
1031                                      CIFS_MOUNT_DYNPERM)
1032                                         direntry->d_inode->i_mode =
1033                                                 (mode | S_IFDIR);
1034
1035                                 if (cifs_sb->mnt_cifs_flags &
1036                                      CIFS_MOUNT_SET_UID) {
1037                                         direntry->d_inode->i_uid =
1038                                                 current->fsuid;
1039                                         if (inode->i_mode & S_ISGID)
1040                                                 direntry->d_inode->i_gid =
1041                                                         inode->i_gid;
1042                                         else
1043                                                 direntry->d_inode->i_gid =
1044                                                         current->fsgid;
1045                                 }
1046                         }
1047                 }
1048         }
1049 mkdir_out:
1050         kfree(full_path);
1051         FreeXid(xid);
1052         return rc;
1053 }
1054
1055 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1056 {
1057         int rc = 0;
1058         int xid;
1059         struct cifs_sb_info *cifs_sb;
1060         struct cifsTconInfo *pTcon;
1061         char *full_path = NULL;
1062         struct cifsInodeInfo *cifsInode;
1063
1064         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1065
1066         xid = GetXid();
1067
1068         cifs_sb = CIFS_SB(inode->i_sb);
1069         pTcon = cifs_sb->tcon;
1070
1071         full_path = build_path_from_dentry(direntry);
1072         if (full_path == NULL) {
1073                 FreeXid(xid);
1074                 return -ENOMEM;
1075         }
1076
1077         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1078                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1079
1080         if (!rc) {
1081                 drop_nlink(inode);
1082                 spin_lock(&direntry->d_inode->i_lock);
1083                 i_size_write(direntry->d_inode, 0);
1084                 clear_nlink(direntry->d_inode);
1085                 spin_unlock(&direntry->d_inode->i_lock);
1086         }
1087
1088         cifsInode = CIFS_I(direntry->d_inode);
1089         cifsInode->time = 0;    /* force revalidate to go get info when
1090                                    needed */
1091         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1092                 current_fs_time(inode->i_sb);
1093
1094         kfree(full_path);
1095         FreeXid(xid);
1096         return rc;
1097 }
1098
1099 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1100         struct inode *target_inode, struct dentry *target_direntry)
1101 {
1102         char *fromName;
1103         char *toName;
1104         struct cifs_sb_info *cifs_sb_source;
1105         struct cifs_sb_info *cifs_sb_target;
1106         struct cifsTconInfo *pTcon;
1107         int xid;
1108         int rc = 0;
1109
1110         xid = GetXid();
1111
1112         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1113         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1114         pTcon = cifs_sb_source->tcon;
1115
1116         if (pTcon != cifs_sb_target->tcon) {
1117                 FreeXid(xid);
1118                 return -EXDEV;  /* BB actually could be allowed if same server,
1119                                    but different share.
1120                                    Might eventually add support for this */
1121         }
1122
1123         /* we already  have the rename sem so we do not need to grab it again
1124            here to protect the path integrity */
1125         fromName = build_path_from_dentry(source_direntry);
1126         toName = build_path_from_dentry(target_direntry);
1127         if ((fromName == NULL) || (toName == NULL)) {
1128                 rc = -ENOMEM;
1129                 goto cifs_rename_exit;
1130         }
1131
1132         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1133                            cifs_sb_source->local_nls,
1134                            cifs_sb_source->mnt_cifs_flags &
1135                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1136         if (rc == -EEXIST) {
1137                 /* check if they are the same file because rename of hardlinked
1138                    files is a noop */
1139                 FILE_UNIX_BASIC_INFO *info_buf_source;
1140                 FILE_UNIX_BASIC_INFO *info_buf_target;
1141
1142                 info_buf_source =
1143                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1144                 if (info_buf_source != NULL) {
1145                         info_buf_target = info_buf_source + 1;
1146                         if (pTcon->unix_ext)
1147                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1148                                         info_buf_source,
1149                                         cifs_sb_source->local_nls,
1150                                         cifs_sb_source->mnt_cifs_flags &
1151                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1152                         /* else rc is still EEXIST so will fall through to
1153                            unlink the target and retry rename */
1154                         if (rc == 0) {
1155                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1156                                                 info_buf_target,
1157                                                 cifs_sb_target->local_nls,
1158                                                 /* remap based on source sb */
1159                                                 cifs_sb_source->mnt_cifs_flags &
1160                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
1161                         }
1162                         if ((rc == 0) &&
1163                             (info_buf_source->UniqueId ==
1164                              info_buf_target->UniqueId)) {
1165                         /* do not rename since the files are hardlinked which
1166                            is a noop */
1167                         } else {
1168                         /* we either can not tell the files are hardlinked
1169                            (as with Windows servers) or files are not
1170                            hardlinked so delete the target manually before
1171                            renaming to follow POSIX rather than Windows
1172                            semantics */
1173                                 cifs_unlink(target_inode, target_direntry);
1174                                 rc = CIFSSMBRename(xid, pTcon, fromName,
1175                                                    toName,
1176                                                    cifs_sb_source->local_nls,
1177                                                    cifs_sb_source->mnt_cifs_flags
1178                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
1179                         }
1180                         kfree(info_buf_source);
1181                 } /* if we can not get memory just leave rc as EEXIST */
1182         }
1183
1184         if (rc)
1185                 cFYI(1, ("rename rc %d", rc));
1186
1187         if ((rc == -EIO) || (rc == -EEXIST)) {
1188                 int oplock = 0;
1189                 __u16 netfid;
1190
1191                 /* BB FIXME Is Generic Read correct for rename? */
1192                 /* if renaming directory - we should not say CREATE_NOT_DIR,
1193                    need to test renaming open directory, also GENERIC_READ
1194                    might not right be right access to request */
1195                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1196                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
1197                                  cifs_sb_source->local_nls,
1198                                  cifs_sb_source->mnt_cifs_flags &
1199                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1200                 if (rc == 0) {
1201                         rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1202                                               cifs_sb_source->local_nls,
1203                                               cifs_sb_source->mnt_cifs_flags &
1204                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1205                         CIFSSMBClose(xid, pTcon, netfid);
1206                 }
1207         }
1208
1209 cifs_rename_exit:
1210         kfree(fromName);
1211         kfree(toName);
1212         FreeXid(xid);
1213         return rc;
1214 }
1215
1216 int cifs_revalidate(struct dentry *direntry)
1217 {
1218         int xid;
1219         int rc = 0, wbrc = 0;
1220         char *full_path;
1221         struct cifs_sb_info *cifs_sb;
1222         struct cifsInodeInfo *cifsInode;
1223         loff_t local_size;
1224         struct timespec local_mtime;
1225         bool invalidate_inode = false;
1226
1227         if (direntry->d_inode == NULL)
1228                 return -ENOENT;
1229
1230         cifsInode = CIFS_I(direntry->d_inode);
1231
1232         if (cifsInode == NULL)
1233                 return -ENOENT;
1234
1235         /* no sense revalidating inode info on file that no one can write */
1236         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1237                 return rc;
1238
1239         xid = GetXid();
1240
1241         cifs_sb = CIFS_SB(direntry->d_sb);
1242
1243         /* can not safely grab the rename sem here if rename calls revalidate
1244            since that would deadlock */
1245         full_path = build_path_from_dentry(direntry);
1246         if (full_path == NULL) {
1247                 FreeXid(xid);
1248                 return -ENOMEM;
1249         }
1250         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1251                  "jiffies %ld", full_path, direntry->d_inode,
1252                  direntry->d_inode->i_count.counter, direntry,
1253                  direntry->d_time, jiffies));
1254
1255         if (cifsInode->time == 0) {
1256                 /* was set to zero previously to force revalidate */
1257         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1258                    lookupCacheEnabled) {
1259                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1260                     (direntry->d_inode->i_nlink == 1)) {
1261                         kfree(full_path);
1262                         FreeXid(xid);
1263                         return rc;
1264                 } else {
1265                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1266                 }
1267         }
1268
1269         /* save mtime and size */
1270         local_mtime = direntry->d_inode->i_mtime;
1271         local_size = direntry->d_inode->i_size;
1272
1273         if (cifs_sb->tcon->unix_ext) {
1274                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1275                                               direntry->d_sb, xid);
1276                 if (rc) {
1277                         cFYI(1, ("error on getting revalidate info %d", rc));
1278 /*                      if (rc != -ENOENT)
1279                                 rc = 0; */      /* BB should we cache info on
1280                                                    certain errors? */
1281                 }
1282         } else {
1283                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1284                                          direntry->d_sb, xid, NULL);
1285                 if (rc) {
1286                         cFYI(1, ("error on getting revalidate info %d", rc));
1287 /*                      if (rc != -ENOENT)
1288                                 rc = 0; */      /* BB should we cache info on
1289                                                    certain errors? */
1290                 }
1291         }
1292         /* should we remap certain errors, access denied?, to zero */
1293
1294         /* if not oplocked, we invalidate inode pages if mtime or file size
1295            had changed on server */
1296
1297         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1298             (local_size == direntry->d_inode->i_size)) {
1299                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1300         } else {
1301                 /* file may have changed on server */
1302                 if (cifsInode->clientCanCacheRead) {
1303                         /* no need to invalidate inode pages since we were the
1304                            only ones who could have modified the file and the
1305                            server copy is staler than ours */
1306                 } else {
1307                         invalidate_inode = true;
1308                 }
1309         }
1310
1311         /* can not grab this sem since kernel filesys locking documentation
1312            indicates i_mutex may be taken by the kernel on lookup and rename
1313            which could deadlock if we grab the i_mutex here as well */
1314 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1315         /* need to write out dirty pages here  */
1316         if (direntry->d_inode->i_mapping) {
1317                 /* do we need to lock inode until after invalidate completes
1318                    below? */
1319                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1320                 if (wbrc)
1321                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1322         }
1323         if (invalidate_inode) {
1324         /* shrink_dcache not necessary now that cifs dentry ops
1325         are exported for negative dentries */
1326 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1327                         shrink_dcache_parent(direntry); */
1328                 if (S_ISREG(direntry->d_inode->i_mode)) {
1329                         if (direntry->d_inode->i_mapping) {
1330                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1331                                 if (wbrc)
1332                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1333                         }
1334                         /* may eventually have to do this for open files too */
1335                         if (list_empty(&(cifsInode->openFileList))) {
1336                                 /* changed on server - flush read ahead pages */
1337                                 cFYI(1, ("Invalidating read ahead data on "
1338                                          "closed file"));
1339                                 invalidate_remote_inode(direntry->d_inode);
1340                         }
1341                 }
1342         }
1343 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1344
1345         kfree(full_path);
1346         FreeXid(xid);
1347         return rc;
1348 }
1349
1350 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1351         struct kstat *stat)
1352 {
1353         int err = cifs_revalidate(dentry);
1354         if (!err) {
1355                 generic_fillattr(dentry->d_inode, stat);
1356                 stat->blksize = CIFS_MAX_MSGSIZE;
1357         }
1358         return err;
1359 }
1360
1361 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1362 {
1363         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1364         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1365         struct page *page;
1366         int rc = 0;
1367
1368         page = grab_cache_page(mapping, index);
1369         if (!page)
1370                 return -ENOMEM;
1371
1372         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1373         unlock_page(page);
1374         page_cache_release(page);
1375         return rc;
1376 }
1377
1378 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1379 {
1380         struct address_space *mapping = inode->i_mapping;
1381         unsigned long limit;
1382
1383         spin_lock(&inode->i_lock);
1384         if (inode->i_size < offset)
1385                 goto do_expand;
1386         /*
1387          * truncation of in-use swapfiles is disallowed - it would cause
1388          * subsequent swapout to scribble on the now-freed blocks.
1389          */
1390         if (IS_SWAPFILE(inode)) {
1391                 spin_unlock(&inode->i_lock);
1392                 goto out_busy;
1393         }
1394         i_size_write(inode, offset);
1395         spin_unlock(&inode->i_lock);
1396         /*
1397          * unmap_mapping_range is called twice, first simply for efficiency
1398          * so that truncate_inode_pages does fewer single-page unmaps. However
1399          * after this first call, and before truncate_inode_pages finishes,
1400          * it is possible for private pages to be COWed, which remain after
1401          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1402          * call must be made for correctness.
1403          */
1404         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1405         truncate_inode_pages(mapping, offset);
1406         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1407         goto out_truncate;
1408
1409 do_expand:
1410         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1411         if (limit != RLIM_INFINITY && offset > limit) {
1412                 spin_unlock(&inode->i_lock);
1413                 goto out_sig;
1414         }
1415         if (offset > inode->i_sb->s_maxbytes) {
1416                 spin_unlock(&inode->i_lock);
1417                 goto out_big;
1418         }
1419         i_size_write(inode, offset);
1420         spin_unlock(&inode->i_lock);
1421 out_truncate:
1422         if (inode->i_op && inode->i_op->truncate)
1423                 inode->i_op->truncate(inode);
1424         return 0;
1425 out_sig:
1426         send_sig(SIGXFSZ, current, 0);
1427 out_big:
1428         return -EFBIG;
1429 out_busy:
1430         return -ETXTBSY;
1431 }
1432
1433 static int
1434 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1435                    int xid, char *full_path)
1436 {
1437         int rc;
1438         struct cifsFileInfo *open_file;
1439         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1440         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1441         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1442
1443         /*
1444          * To avoid spurious oplock breaks from server, in the case of
1445          * inodes that we already have open, avoid doing path based
1446          * setting of file size if we can do it by handle.
1447          * This keeps our caching token (oplock) and avoids timeouts
1448          * when the local oplock break takes longer to flush
1449          * writebehind data than the SMB timeout for the SetPathInfo
1450          * request would allow
1451          */
1452         open_file = find_writable_file(cifsInode);
1453         if (open_file) {
1454                 __u16 nfid = open_file->netfid;
1455                 __u32 npid = open_file->pid;
1456                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1457                                         npid, false);
1458                 atomic_dec(&open_file->wrtPending);
1459                 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1460                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1461                         unsigned int bytes_written;
1462                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1463                                           &bytes_written, NULL, NULL, 1);
1464                         cFYI(1, ("Wrt seteof rc %d", rc));
1465                 }
1466         } else
1467                 rc = -EINVAL;
1468
1469         if (rc != 0) {
1470                 /* Set file size by pathname rather than by handle
1471                    either because no valid, writeable file handle for
1472                    it was found or because there was an error setting
1473                    it by handle */
1474                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1475                                    false, cifs_sb->local_nls,
1476                                    cifs_sb->mnt_cifs_flags &
1477                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1478                 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1479                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1480                         __u16 netfid;
1481                         int oplock = 0;
1482
1483                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1484                                 FILE_OPEN, GENERIC_WRITE,
1485                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1486                                 cifs_sb->local_nls,
1487                                 cifs_sb->mnt_cifs_flags &
1488                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1489                         if (rc == 0) {
1490                                 unsigned int bytes_written;
1491                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1492                                                   attrs->ia_size,
1493                                                   &bytes_written, NULL,
1494                                                   NULL, 1);
1495                                 cFYI(1, ("wrt seteof rc %d", rc));
1496                                 CIFSSMBClose(xid, pTcon, netfid);
1497                         }
1498                 }
1499         }
1500
1501         if (rc == 0) {
1502                 rc = cifs_vmtruncate(inode, attrs->ia_size);
1503                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1504         }
1505
1506         return rc;
1507 }
1508
1509 static int
1510 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
1511                     char *full_path, __u32 dosattr)
1512 {
1513         int rc;
1514         int oplock = 0;
1515         __u16 netfid;
1516         __u32 netpid;
1517         bool set_time = false;
1518         struct cifsFileInfo *open_file;
1519         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1520         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1521         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1522         FILE_BASIC_INFO info_buf;
1523
1524         if (attrs->ia_valid & ATTR_ATIME) {
1525                 set_time = true;
1526                 info_buf.LastAccessTime =
1527                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1528         } else
1529                 info_buf.LastAccessTime = 0;
1530
1531         if (attrs->ia_valid & ATTR_MTIME) {
1532                 set_time = true;
1533                 info_buf.LastWriteTime =
1534                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1535         } else
1536                 info_buf.LastWriteTime = 0;
1537
1538         /*
1539          * Samba throws this field away, but windows may actually use it.
1540          * Do not set ctime unless other time stamps are changed explicitly
1541          * (i.e. by utimes()) since we would then have a mix of client and
1542          * server times.
1543          */
1544         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1545                 cFYI(1, ("CIFS - CTIME changed"));
1546                 info_buf.ChangeTime =
1547                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1548         } else
1549                 info_buf.ChangeTime = 0;
1550
1551         info_buf.CreationTime = 0;      /* don't change */
1552         info_buf.Attributes = cpu_to_le32(dosattr);
1553
1554         /*
1555          * If the file is already open for write, just use that fileid
1556          */
1557         open_file = find_writable_file(cifsInode);
1558         if (open_file) {
1559                 netfid = open_file->netfid;
1560                 netpid = open_file->pid;
1561                 goto set_via_filehandle;
1562         }
1563
1564         /*
1565          * NT4 apparently returns success on this call, but it doesn't
1566          * really work.
1567          */
1568         if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
1569                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
1570                                      &info_buf, cifs_sb->local_nls,
1571                                      cifs_sb->mnt_cifs_flags &
1572                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1573                 if (rc != -EOPNOTSUPP && rc != -EINVAL)
1574                         goto out;
1575         }
1576
1577         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1578                  "times not supported by this server"));
1579         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1580                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1581                          CREATE_NOT_DIR, &netfid, &oplock,
1582                          NULL, cifs_sb->local_nls,
1583                          cifs_sb->mnt_cifs_flags &
1584                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1585
1586         if (rc != 0) {
1587                 if (rc == -EIO)
1588                         rc = -EINVAL;
1589                 goto out;
1590         }
1591
1592         netpid = current->tgid;
1593
1594 set_via_filehandle:
1595         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
1596         if (open_file == NULL)
1597                 CIFSSMBClose(xid, pTcon, netfid);
1598         else
1599                 atomic_dec(&open_file->wrtPending);
1600 out:
1601         return rc;
1602 }
1603
1604 static int
1605 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1606 {
1607         int rc;
1608         int xid;
1609         char *full_path = NULL;
1610         struct inode *inode = direntry->d_inode;
1611         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1612         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1613         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1614         struct cifs_unix_set_info_args *args = NULL;
1615
1616         cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1617                  direntry->d_name.name, attrs->ia_valid));
1618
1619         xid = GetXid();
1620
1621         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1622                 /* check if we have permission to change attrs */
1623                 rc = inode_change_ok(inode, attrs);
1624                 if (rc < 0)
1625                         goto out;
1626                 else
1627                         rc = 0;
1628         }
1629
1630         full_path = build_path_from_dentry(direntry);
1631         if (full_path == NULL) {
1632                 rc = -ENOMEM;
1633                 goto out;
1634         }
1635
1636         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1637                 /*
1638                    Flush data before changing file size or changing the last
1639                    write time of the file on the server. If the
1640                    flush returns error, store it to report later and continue.
1641                    BB: This should be smarter. Why bother flushing pages that
1642                    will be truncated anyway? Also, should we error out here if
1643                    the flush returns error?
1644                  */
1645                 rc = filemap_write_and_wait(inode->i_mapping);
1646                 if (rc != 0) {
1647                         cifsInode->write_behind_rc = rc;
1648                         rc = 0;
1649                 }
1650         }
1651
1652         if (attrs->ia_valid & ATTR_SIZE) {
1653                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1654                 if (rc != 0)
1655                         goto out;
1656         }
1657
1658         /* skip mode change if it's just for clearing setuid/setgid */
1659         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1660                 attrs->ia_valid &= ~ATTR_MODE;
1661
1662         args = kmalloc(sizeof(*args), GFP_KERNEL);
1663         if (args == NULL) {
1664                 rc = -ENOMEM;
1665                 goto out;
1666         }
1667
1668         /* set up the struct */
1669         if (attrs->ia_valid & ATTR_MODE)
1670                 args->mode = attrs->ia_mode;
1671         else
1672                 args->mode = NO_CHANGE_64;
1673
1674         if (attrs->ia_valid & ATTR_UID)
1675                 args->uid = attrs->ia_uid;
1676         else
1677                 args->uid = NO_CHANGE_64;
1678
1679         if (attrs->ia_valid & ATTR_GID)
1680                 args->gid = attrs->ia_gid;
1681         else
1682                 args->gid = NO_CHANGE_64;
1683
1684         if (attrs->ia_valid & ATTR_ATIME)
1685                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1686         else
1687                 args->atime = NO_CHANGE_64;
1688
1689         if (attrs->ia_valid & ATTR_MTIME)
1690                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1691         else
1692                 args->mtime = NO_CHANGE_64;
1693
1694         if (attrs->ia_valid & ATTR_CTIME)
1695                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1696         else
1697                 args->ctime = NO_CHANGE_64;
1698
1699         args->device = 0;
1700         rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1701                                 cifs_sb->local_nls,
1702                                 cifs_sb->mnt_cifs_flags &
1703                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1704
1705         if (!rc)
1706                 rc = inode_setattr(inode, attrs);
1707 out:
1708         kfree(args);
1709         kfree(full_path);
1710         FreeXid(xid);
1711         return rc;
1712 }
1713
1714 static int
1715 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1716 {
1717         int xid;
1718         struct inode *inode = direntry->d_inode;
1719         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1720         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1721         char *full_path = NULL;
1722         int rc = -EACCES;
1723         __u32 dosattr = 0;
1724         __u64 mode = NO_CHANGE_64;
1725
1726         xid = GetXid();
1727
1728         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1729                  direntry->d_name.name, attrs->ia_valid));
1730
1731         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1732                 /* check if we have permission to change attrs */
1733                 rc = inode_change_ok(inode, attrs);
1734                 if (rc < 0) {
1735                         FreeXid(xid);
1736                         return rc;
1737                 } else
1738                         rc = 0;
1739         }
1740
1741         full_path = build_path_from_dentry(direntry);
1742         if (full_path == NULL) {
1743                 FreeXid(xid);
1744                 return -ENOMEM;
1745         }
1746
1747         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1748                 /*
1749                    Flush data before changing file size or changing the last
1750                    write time of the file on the server. If the
1751                    flush returns error, store it to report later and continue.
1752                    BB: This should be smarter. Why bother flushing pages that
1753                    will be truncated anyway? Also, should we error out here if
1754                    the flush returns error?
1755                  */
1756                 rc = filemap_write_and_wait(inode->i_mapping);
1757                 if (rc != 0) {
1758                         cifsInode->write_behind_rc = rc;
1759                         rc = 0;
1760                 }
1761         }
1762
1763         if (attrs->ia_valid & ATTR_SIZE) {
1764                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1765                 if (rc != 0)
1766                         goto cifs_setattr_exit;
1767         }
1768
1769         /*
1770          * Without unix extensions we can't send ownership changes to the
1771          * server, so silently ignore them. This is consistent with how
1772          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1773          * CIFSACL support + proper Windows to Unix idmapping, we may be
1774          * able to support this in the future.
1775          */
1776         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1777                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1778
1779         /* skip mode change if it's just for clearing setuid/setgid */
1780         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1781                 attrs->ia_valid &= ~ATTR_MODE;
1782
1783         if (attrs->ia_valid & ATTR_MODE) {
1784                 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1785                 mode = attrs->ia_mode;
1786         }
1787
1788         if (attrs->ia_valid & ATTR_MODE) {
1789                 rc = 0;
1790 #ifdef CONFIG_CIFS_EXPERIMENTAL
1791                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1792                         rc = mode_to_acl(inode, full_path, mode);
1793                 else
1794 #endif
1795                 if (((mode & S_IWUGO) == 0) &&
1796                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1797
1798                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1799
1800                         /* fix up mode if we're not using dynperm */
1801                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1802                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1803                 } else if ((mode & S_IWUGO) &&
1804                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
1805
1806                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1807                         /* Attributes of 0 are ignored */
1808                         if (dosattr == 0)
1809                                 dosattr |= ATTR_NORMAL;
1810
1811                         /* reset local inode permissions to normal */
1812                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1813                                 attrs->ia_mode &= ~(S_IALLUGO);
1814                                 if (S_ISDIR(inode->i_mode))
1815                                         attrs->ia_mode |=
1816                                                 cifs_sb->mnt_dir_mode;
1817                                 else
1818                                         attrs->ia_mode |=
1819                                                 cifs_sb->mnt_file_mode;
1820                         }
1821                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1822                         /* ignore mode change - ATTR_READONLY hasn't changed */
1823                         attrs->ia_valid &= ~ATTR_MODE;
1824                 }
1825         }
1826
1827         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1828             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1829                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1830                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1831
1832                 /* Even if error on time set, no sense failing the call if
1833                 the server would set the time to a reasonable value anyway,
1834                 and this check ensures that we are not being called from
1835                 sys_utimes in which case we ought to fail the call back to
1836                 the user when the server rejects the call */
1837                 if ((rc) && (attrs->ia_valid &
1838                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1839                         rc = 0;
1840         }
1841
1842         /* do not need local check to inode_check_ok since the server does
1843            that */
1844         if (!rc)
1845                 rc = inode_setattr(inode, attrs);
1846 cifs_setattr_exit:
1847         kfree(full_path);
1848         FreeXid(xid);
1849         return rc;
1850 }
1851
1852 int
1853 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1854 {
1855         struct inode *inode = direntry->d_inode;
1856         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1857         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1858
1859         if (pTcon->unix_ext)
1860                 return cifs_setattr_unix(direntry, attrs);
1861
1862         return cifs_setattr_nounix(direntry, attrs);
1863
1864         /* BB: add cifs_setattr_legacy for really old servers */
1865 }
1866
1867 #if 0
1868 void cifs_delete_inode(struct inode *inode)
1869 {
1870         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1871         /* may have to add back in if and when safe distributed caching of
1872            directories added e.g. via FindNotify */
1873 }
1874 #endif