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         cifsInfo->delete_pending = pfindData->DeletePending ? true : false;
 510         cFYI(1, ("Old time %ld", cifsInfo->time));
 511         cifsInfo->time = jiffies;
 512         cFYI(1, ("New time %ld", cifsInfo->time));
 513
 514         /* blksize needs to be multiple of two. So safer to default to
 515         blksize and blkbits set in superblock so 2**blkbits and blksize
 516         will match rather than setting to:
 517         (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 518
 519         /* Linux can not store file creation time so ignore it */
 520         if (pfindData->LastAccessTime)
 521                 inode->i_atime = cifs_NTtimeToUnix
 522                         (le64_to_cpu(pfindData->LastAccessTime));
 523         else /* do not need to use current_fs_time - time not stored */
 524                 inode->i_atime = CURRENT_TIME;
 525         inode->i_mtime =
 526                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 527         inode->i_ctime =
 528             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 529         cFYI(DBG2, ("Attributes came in as 0x%x", attr));
 530         if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
 531                 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
 532                 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
 533         }
 534
 535         /* get default inode mode */
 536         if (attr & ATTR_DIRECTORY)
 537                 default_mode = cifs_sb->mnt_dir_mode;
 538         else
 539                 default_mode = cifs_sb->mnt_file_mode;
 540
 541         /* set permission bits */
 542         if (atomic_read(&cifsInfo->inUse) == 0 ||
 543             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
 544                 inode->i_mode = default_mode;
 545         else {
 546                 /* just reenable write bits if !ATTR_READONLY */
 547                 if ((inode->i_mode & S_IWUGO) == 0 &&
 548                     (attr & ATTR_READONLY) == 0)
 549                         inode->i_mode |= (S_IWUGO & default_mode);
 550
 551                 inode->i_mode &= ~S_IFMT;
 552         }
 553         /* clear write bits if ATTR_READONLY is set */
 554         if (attr & ATTR_READONLY)
 555                 inode->i_mode &= ~S_IWUGO;
 556
 557         /* set inode type */
 558         if ((attr & ATTR_SYSTEM) &&
 559             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
 560                 /* no need to fix endianness on 0 */
 561                 if (pfindData->EndOfFile == 0)
 562                         inode->i_mode |= S_IFIFO;
 563                 else if (decode_sfu_inode(inode,
 564                                 le64_to_cpu(pfindData->EndOfFile),
 565                                 full_path, cifs_sb, xid))
 566                         cFYI(1, ("unknown SFU file type\n"));
 567         } else {
 568                 if (attr & ATTR_DIRECTORY)
 569                         inode->i_mode |= S_IFDIR;
 570                 else
 571                         inode->i_mode |= S_IFREG;
 572         }
 573
 574         spin_lock(&inode->i_lock);
 575         if (is_size_safe_to_change(cifsInfo,
 576                                    le64_to_cpu(pfindData->EndOfFile))) {
 577                 /* can not safely shrink the file size here if the
 578                    client is writing to it due to potential races */
 579                 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
 580
 581                 /* 512 bytes (2**9) is the fake blocksize that must be
 582                    used for this calculation */
 583                 inode->i_blocks = (512 - 1 + le64_to_cpu(
 584                                    pfindData->AllocationSize)) >> 9;
 585         }
 586         spin_unlock(&inode->i_lock);
 587
 588         inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 589
 590         /* BB fill in uid and gid here? with help from winbind?
 591            or retrieve from NTFS stream extended attribute */
 592 #ifdef CONFIG_CIFS_EXPERIMENTAL
 593         /* fill in 0777 bits from ACL */
 594         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 595                 cFYI(1, ("Getting mode bits from ACL"));
 596                 acl_to_uid_mode(inode, full_path, pfid);
 597         }
 598 #endif
 599         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 600                 /* fill in remaining high mode bits e.g. SUID, VTX */
 601                 get_sfu_mode(inode, full_path, cifs_sb, xid);
 602         } else if (atomic_read(&cifsInfo->inUse) == 0) {
 603                 inode->i_uid = cifs_sb->mnt_uid;
 604                 inode->i_gid = cifs_sb->mnt_gid;
 605                 /* set so we do not keep refreshing these fields with
 606                    bad data after user has changed them in memory */
 607                 atomic_set(&cifsInfo->inUse, 1);
 608         }
 609
 610         cifs_set_ops(inode, is_dfs_referral);
 611
 612
 613
 614
 615 cgii_exit:
 616         kfree(buf);
 617         return rc;
 618 }
 619
 620 static const struct inode_operations cifs_ipc_inode_ops = {
 621         .lookup = cifs_lookup,
 622 };
 623
 624 /* gets root inode */
 625 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
 626 {
 627         int xid;
 628         struct cifs_sb_info *cifs_sb;
 629         struct inode *inode;
 630         long rc;
 631
 632         inode = iget_locked(sb, ino);
 633         if (!inode)
 634                 return ERR_PTR(-ENOMEM);
 635         if (!(inode->i_state & I_NEW))
 636                 return inode;
 637
 638         cifs_sb = CIFS_SB(inode->i_sb);
 639         xid = GetXid();
 640
 641         if (cifs_sb->tcon->unix_ext)
 642                 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
 643         else
 644                 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
 645                                          NULL);
 646         if (rc && cifs_sb->tcon->ipc) {
 647                 cFYI(1, ("ipc connection - fake read inode"));
 648                 inode->i_mode |= S_IFDIR;
 649                 inode->i_nlink = 2;
 650                 inode->i_op = &cifs_ipc_inode_ops;
 651                 inode->i_fop = &simple_dir_operations;
 652                 inode->i_uid = cifs_sb->mnt_uid;
 653                 inode->i_gid = cifs_sb->mnt_gid;
 654         } else if (rc) {
 655                 _FreeXid(xid);
 656                 iget_failed(inode);
 657                 return ERR_PTR(rc);
 658         }
 659
 660         unlock_new_inode(inode);
 661
 662         /* can not call macro FreeXid here since in a void func
 663          * TODO: This is no longer true
 664          */
 665         _FreeXid(xid);
 666         return inode;
 667 }
 668
 669 static int
 670 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
 671                     char *full_path, __u32 dosattr)
 672 {
 673         int rc;
 674         int oplock = 0;
 675         __u16 netfid;
 676         __u32 netpid;
 677         bool set_time = false;
 678         struct cifsFileInfo *open_file;
 679         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 680         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 681         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 682         FILE_BASIC_INFO info_buf;
 683
 684         if (attrs->ia_valid & ATTR_ATIME) {
 685                 set_time = true;
 686                 info_buf.LastAccessTime =
 687                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
 688         } else
 689                 info_buf.LastAccessTime = 0;
 690
 691         if (attrs->ia_valid & ATTR_MTIME) {
 692                 set_time = true;
 693                 info_buf.LastWriteTime =
 694                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
 695         } else
 696                 info_buf.LastWriteTime = 0;
 697
 698         /*
 699          * Samba throws this field away, but windows may actually use it.
 700          * Do not set ctime unless other time stamps are changed explicitly
 701          * (i.e. by utimes()) since we would then have a mix of client and
 702          * server times.
 703          */
 704         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
 705                 cFYI(1, ("CIFS - CTIME changed"));
 706                 info_buf.ChangeTime =
 707                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
 708         } else
 709                 info_buf.ChangeTime = 0;
 710
 711         info_buf.CreationTime = 0;      /* don't change */
 712         info_buf.Attributes = cpu_to_le32(dosattr);
 713
 714         /*
 715          * If the file is already open for write, just use that fileid
 716          */
 717         open_file = find_writable_file(cifsInode);
 718         if (open_file) {
 719                 netfid = open_file->netfid;
 720                 netpid = open_file->pid;
 721                 goto set_via_filehandle;
 722         }
 723
 724         /*
 725          * NT4 apparently returns success on this call, but it doesn't
 726          * really work.
 727          */
 728         if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
 729                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
 730                                      &info_buf, cifs_sb->local_nls,
 731                                      cifs_sb->mnt_cifs_flags &
 732                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 733                 if (rc == 0) {
 734                         cifsInode->cifsAttrs = dosattr;
 735                         goto out;
 736                 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
 737                         goto out;
 738         }
 739
 740         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
 741                  "times not supported by this server"));
 742         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
 743                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
 744                          CREATE_NOT_DIR, &netfid, &oplock,
 745                          NULL, cifs_sb->local_nls,
 746                          cifs_sb->mnt_cifs_flags &
 747                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 748
 749         if (rc != 0) {
 750                 if (rc == -EIO)
 751                         rc = -EINVAL;
 752                 goto out;
 753         }
 754
 755         netpid = current->tgid;
 756
 757 set_via_filehandle:
 758         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
 759         if (!rc)
 760                 cifsInode->cifsAttrs = dosattr;
 761
 762         if (open_file == NULL)
 763                 CIFSSMBClose(xid, pTcon, netfid);
 764         else
 765                 atomic_dec(&open_file->wrtPending);
 766 out:
 767         return rc;
 768 }
 769
 770 /*
 771  * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 772  * and rename it to a random name that hopefully won't conflict with
 773  * anything else.
 774  */
 775 static int
 776 cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
 777 {
 778         int oplock = 0;
 779         int rc;
 780         __u16 netfid;
 781         struct inode *inode = dentry->d_inode;
 782         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 783         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 784         struct cifsTconInfo *tcon = cifs_sb->tcon;
 785         __u32 dosattr, origattr;
 786         FILE_BASIC_INFO *info_buf = NULL;
 787
 788         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 789                          DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
 790                          &netfid, &oplock, NULL, cifs_sb->local_nls,
 791                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 792         if (rc != 0)
 793                 goto out;
 794
 795         origattr = cifsInode->cifsAttrs;
 796         if (origattr == 0)
 797                 origattr |= ATTR_NORMAL;
 798
 799         dosattr = origattr & ~ATTR_READONLY;
 800         if (dosattr == 0)
 801                 dosattr |= ATTR_NORMAL;
 802         dosattr |= ATTR_HIDDEN;
 803
 804         /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
 805         if (dosattr != origattr) {
 806                 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
 807                 if (info_buf == NULL) {
 808                         rc = -ENOMEM;
 809                         goto out_close;
 810                 }
 811                 info_buf->Attributes = cpu_to_le32(dosattr);
 812                 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
 813                                         current->tgid);
 814                 /* although we would like to mark the file hidden
 815                    if that fails we will still try to rename it */
 816                 if (rc != 0)
 817                         cifsInode->cifsAttrs = dosattr;
 818                 else
 819                         dosattr = origattr; /* since not able to change them */
 820         }
 821
 822         /* rename the file */
 823         rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
 824                                    cifs_sb->mnt_cifs_flags &
 825                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 826         if (rc != 0) {
 827                 rc = -ETXTBSY;
 828                 goto undo_setattr;
 829         }
 830
 831         /* try to set DELETE_ON_CLOSE */
 832         if (!cifsInode->delete_pending) {
 833                 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
 834                                                current->tgid);
 835                 /*
 836                  * some samba versions return -ENOENT when we try to set the
 837                  * file disposition here. Likely a samba bug, but work around
 838                  * it for now. This means that some cifsXXX files may hang
 839                  * around after they shouldn't.
 840                  *
 841                  * BB: remove this hack after more servers have the fix
 842                  */
 843                 if (rc == -ENOENT)
 844                         rc = 0;
 845                 else if (rc != 0) {
 846                         rc = -ETXTBSY;
 847                         goto undo_rename;
 848                 }
 849                 cifsInode->delete_pending = true;
 850         }
 851
 852 out_close:
 853         CIFSSMBClose(xid, tcon, netfid);
 854 out:
 855         kfree(info_buf);
 856         return rc;
 857
 858         /*
 859          * reset everything back to the original state. Don't bother
 860          * dealing with errors here since we can't do anything about
 861          * them anyway.
 862          */
 863 undo_rename:
 864         CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
 865                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 866                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 867 undo_setattr:
 868         if (dosattr != origattr) {
 869                 info_buf->Attributes = cpu_to_le32(origattr);
 870                 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
 871                                         current->tgid))
 872                         cifsInode->cifsAttrs = origattr;
 873         }
 874
 875         goto out_close;
 876 }
 877
 878 int cifs_unlink(struct inode *dir, struct dentry *dentry)
 879 {
 880         int rc = 0;
 881         int xid;
 882         char *full_path = NULL;
 883         struct inode *inode = dentry->d_inode;
 884         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 885         struct super_block *sb = dir->i_sb;
 886         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 887         struct cifsTconInfo *tcon = cifs_sb->tcon;
 888         struct iattr *attrs = NULL;
 889         __u32 dosattr = 0, origattr = 0;
 890
 891         cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
 892
 893         xid = GetXid();
 894
 895         /* Unlink can be called from rename so we can not take the
 896          * sb->s_vfs_rename_mutex here */
 897         full_path = build_path_from_dentry(dentry);
 898         if (full_path == NULL) {
 899                 FreeXid(xid);
 900                 return -ENOMEM;
 901         }
 902
 903         if ((tcon->ses->capabilities & CAP_UNIX) &&
 904                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 905                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
 906                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
 907                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 908                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 909                 cFYI(1, ("posix del rc %d", rc));
 910                 if ((rc == 0) || (rc == -ENOENT))
 911                         goto psx_del_no_retry;
 912         }
 913
 914 retry_std_delete:
 915         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
 916                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 917
 918 psx_del_no_retry:
 919         if (!rc) {
 920                 if (inode)
 921                         drop_nlink(inode);
 922         } else if (rc == -ENOENT) {
 923                 d_drop(dentry);
 924         } else if (rc == -ETXTBSY) {
 925                 rc = cifs_rename_pending_delete(full_path, dentry, xid);
 926                 if (rc == 0)
 927                         drop_nlink(inode);
 928         } else if (rc == -EACCES && dosattr == 0) {
 929                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
 930                 if (attrs == NULL) {
 931                         rc = -ENOMEM;
 932                         goto out_reval;
 933                 }
 934
 935                 /* try to reset dos attributes */
 936                 origattr = cifsInode->cifsAttrs;
 937                 if (origattr == 0)
 938                         origattr |= ATTR_NORMAL;
 939                 dosattr = origattr & ~ATTR_READONLY;
 940                 if (dosattr == 0)
 941                         dosattr |= ATTR_NORMAL;
 942                 dosattr |= ATTR_HIDDEN;
 943
 944                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
 945                 if (rc != 0)
 946                         goto out_reval;
 947
 948                 goto retry_std_delete;
 949         }
 950
 951         /* undo the setattr if we errored out and it's needed */
 952         if (rc != 0 && dosattr != 0)
 953                 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
 954
 955 out_reval:
 956         if (inode) {
 957                 cifsInode = CIFS_I(inode);
 958                 cifsInode->time = 0;    /* will force revalidate to get info
 959                                            when needed */
 960                 inode->i_ctime = current_fs_time(sb);
 961         }
 962         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
 963         cifsInode = CIFS_I(dir);
 964         CIFS_I(dir)->time = 0;  /* force revalidate of dir as well */
 965
 966         kfree(full_path);
 967         kfree(attrs);
 968         FreeXid(xid);
 969         return rc;
 970 }
 971
 972 static void posix_fill_in_inode(struct inode *tmp_inode,
 973         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 974 {
 975         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 976         loff_t local_size;
 977         struct timespec local_mtime;
 978
 979         cifsInfo->time = jiffies;
 980         atomic_inc(&cifsInfo->inUse);
 981
 982         /* save mtime and size */
 983         local_mtime = tmp_inode->i_mtime;
 984         local_size  = tmp_inode->i_size;
 985
 986         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 987         cifs_set_ops(tmp_inode, false);
 988
 989         if (!S_ISREG(tmp_inode->i_mode))
 990                 return;
 991
 992         /*
 993          * No sense invalidating pages for new inode
 994          * since we we have not started caching
 995          * readahead file data yet.
 996          */
 997         if (isNewInode)
 998                 return;
 999
1000         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
1001                 (local_size == tmp_inode->i_size)) {
1002                 cFYI(1, ("inode exists but unchanged"));
1003         } else {
1004                 /* file may have changed on server */
1005                 cFYI(1, ("invalidate inode, readdir detected change"));
1006                 invalidate_remote_inode(tmp_inode);
1007         }
1008 }
1009
1010 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
1011 {
1012         int rc = 0, tmprc;
1013         int xid;
1014         struct cifs_sb_info *cifs_sb;
1015         struct cifsTconInfo *pTcon;
1016         char *full_path = NULL;
1017         struct inode *newinode = NULL;
1018
1019         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
1020
1021         xid = GetXid();
1022
1023         cifs_sb = CIFS_SB(inode->i_sb);
1024         pTcon = cifs_sb->tcon;
1025
1026         full_path = build_path_from_dentry(direntry);
1027         if (full_path == NULL) {
1028                 FreeXid(xid);
1029                 return -ENOMEM;
1030         }
1031
1032         if ((pTcon->ses->capabilities & CAP_UNIX) &&
1033                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1034                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
1035                 u32 oplock = 0;
1036                 FILE_UNIX_BASIC_INFO *pInfo =
1037                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1038                 if (pInfo == NULL) {
1039                         rc = -ENOMEM;
1040                         goto mkdir_out;
1041                 }
1042
1043                 mode &= ~current->fs->umask;
1044                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1045                                 mode, NULL /* netfid */, pInfo, &oplock,
1046                                 full_path, cifs_sb->local_nls,
1047                                 cifs_sb->mnt_cifs_flags &
1048                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1049                 if (rc == -EOPNOTSUPP) {
1050                         kfree(pInfo);
1051                         goto mkdir_retry_old;
1052                 } else if (rc) {
1053                         cFYI(1, ("posix mkdir returned 0x%x", rc));
1054                         d_drop(direntry);
1055                 } else {
1056                         if (pInfo->Type == cpu_to_le32(-1)) {
1057                                 /* no return info, go query for it */
1058                                 kfree(pInfo);
1059                                 goto mkdir_get_info;
1060                         }
1061 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1062         to set uid/gid */
1063                         inc_nlink(inode);
1064                         if (pTcon->nocase)
1065                                 direntry->d_op = &cifs_ci_dentry_ops;
1066                         else
1067                                 direntry->d_op = &cifs_dentry_ops;
1068
1069                         newinode = new_inode(inode->i_sb);
1070                         if (newinode == NULL) {
1071                                 kfree(pInfo);
1072                                 goto mkdir_get_info;
1073                         }
1074
1075                         /* Is an i_ino of zero legal? */
1076                         /* Are there sanity checks we can use to ensure that
1077                            the server is really filling in that field? */
1078                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1079                                 newinode->i_ino =
1080                                         (unsigned long)pInfo->UniqueId;
1081                         } /* note ino incremented to unique num in new_inode */
1082                         if (inode->i_sb->s_flags & MS_NOATIME)
1083                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
1084                         newinode->i_nlink = 2;
1085
1086                         insert_inode_hash(newinode);
1087                         d_instantiate(direntry, newinode);
1088
1089                         /* we already checked in POSIXCreate whether
1090                            frame was long enough */
1091                         posix_fill_in_inode(direntry->d_inode,
1092                                         pInfo, 1 /* NewInode */);
1093 #ifdef CONFIG_CIFS_DEBUG2
1094                         cFYI(1, ("instantiated dentry %p %s to inode %p",
1095                                 direntry, direntry->d_name.name, newinode));
1096
1097                         if (newinode->i_nlink != 2)
1098                                 cFYI(1, ("unexpected number of links %d",
1099                                         newinode->i_nlink));
1100 #endif
1101                 }
1102                 kfree(pInfo);
1103                 goto mkdir_out;
1104         }
1105 mkdir_retry_old:
1106         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1107         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1108                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1109         if (rc) {
1110                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1111                 d_drop(direntry);
1112         } else {
1113 mkdir_get_info:
1114                 inc_nlink(inode);
1115                 if (pTcon->unix_ext)
1116                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1117                                                       inode->i_sb, xid);
1118                 else
1119                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1120                                                  inode->i_sb, xid, NULL);
1121
1122                 if (pTcon->nocase)
1123                         direntry->d_op = &cifs_ci_dentry_ops;
1124                 else
1125                         direntry->d_op = &cifs_dentry_ops;
1126                 d_instantiate(direntry, newinode);
1127                  /* setting nlink not necessary except in cases where we
1128                   * failed to get it from the server or was set bogus */
1129                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1130                                 direntry->d_inode->i_nlink = 2;
1131
1132                 mode &= ~current->fs->umask;
1133                 /* must turn on setgid bit if parent dir has it */
1134                 if (inode->i_mode & S_ISGID)
1135                         mode |= S_ISGID;
1136
1137                 if (pTcon->unix_ext) {
1138                         struct cifs_unix_set_info_args args = {
1139                                 .mode   = mode,
1140                                 .ctime  = NO_CHANGE_64,
1141                                 .atime  = NO_CHANGE_64,
1142                                 .mtime  = NO_CHANGE_64,
1143                                 .device = 0,
1144                         };
1145                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1146                                 args.uid = (__u64)current->fsuid;
1147                                 if (inode->i_mode & S_ISGID)
1148                                         args.gid = (__u64)inode->i_gid;
1149                                 else
1150                                         args.gid = (__u64)current->fsgid;
1151                         } else {
1152                                 args.uid = NO_CHANGE_64;
1153                                 args.gid = NO_CHANGE_64;
1154                         }
1155                         CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1156                                             cifs_sb->local_nls,
1157                                             cifs_sb->mnt_cifs_flags &
1158                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1159                 } else {
1160                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1161                             (mode & S_IWUGO) == 0) {
1162                                 FILE_BASIC_INFO pInfo;
1163                                 struct cifsInodeInfo *cifsInode;
1164                                 u32 dosattrs;
1165
1166                                 memset(&pInfo, 0, sizeof(pInfo));
1167                                 cifsInode = CIFS_I(newinode);
1168                                 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1169                                 pInfo.Attributes = cpu_to_le32(dosattrs);
1170                                 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1171                                                 full_path, &pInfo,
1172                                                 cifs_sb->local_nls,
1173                                                 cifs_sb->mnt_cifs_flags &
1174                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1175                                 if (tmprc == 0)
1176                                         cifsInode->cifsAttrs = dosattrs;
1177                         }
1178                         if (direntry->d_inode) {
1179                                 if (cifs_sb->mnt_cifs_flags &
1180                                      CIFS_MOUNT_DYNPERM)
1181                                         direntry->d_inode->i_mode =
1182                                                 (mode | S_IFDIR);
1183
1184                                 if (cifs_sb->mnt_cifs_flags &
1185                                      CIFS_MOUNT_SET_UID) {
1186                                         direntry->d_inode->i_uid =
1187                                                 current->fsuid;
1188                                         if (inode->i_mode & S_ISGID)
1189                                                 direntry->d_inode->i_gid =
1190                                                         inode->i_gid;
1191                                         else
1192                                                 direntry->d_inode->i_gid =
1193                                                         current->fsgid;
1194                                 }
1195                         }
1196                 }
1197         }
1198 mkdir_out:
1199         kfree(full_path);
1200         FreeXid(xid);
1201         return rc;
1202 }
1203
1204 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1205 {
1206         int rc = 0;
1207         int xid;
1208         struct cifs_sb_info *cifs_sb;
1209         struct cifsTconInfo *pTcon;
1210         char *full_path = NULL;
1211         struct cifsInodeInfo *cifsInode;
1212
1213         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1214
1215         xid = GetXid();
1216
1217         cifs_sb = CIFS_SB(inode->i_sb);
1218         pTcon = cifs_sb->tcon;
1219
1220         full_path = build_path_from_dentry(direntry);
1221         if (full_path == NULL) {
1222                 FreeXid(xid);
1223                 return -ENOMEM;
1224         }
1225
1226         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1227                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1228
1229         if (!rc) {
1230                 drop_nlink(inode);
1231                 spin_lock(&direntry->d_inode->i_lock);
1232                 i_size_write(direntry->d_inode, 0);
1233                 clear_nlink(direntry->d_inode);
1234                 spin_unlock(&direntry->d_inode->i_lock);
1235         }
1236
1237         cifsInode = CIFS_I(direntry->d_inode);
1238         cifsInode->time = 0;    /* force revalidate to go get info when
1239                                    needed */
1240         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1241                 current_fs_time(inode->i_sb);
1242
1243         kfree(full_path);
1244         FreeXid(xid);
1245         return rc;
1246 }
1247
1248 static int
1249 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1250                 struct dentry *to_dentry, const char *toPath)
1251 {
1252         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1253         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1254         __u16 srcfid;
1255         int oplock, rc;
1256
1257         /* try path-based rename first */
1258         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1259                            cifs_sb->mnt_cifs_flags &
1260                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1261
1262         /*
1263          * don't bother with rename by filehandle unless file is busy and
1264          * source Note that cross directory moves do not work with
1265          * rename by filehandle to various Windows servers.
1266          */
1267         if (rc == 0 || rc != -ETXTBSY)
1268                 return rc;
1269
1270         /* open the file to be renamed -- we need DELETE perms */
1271         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1272                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1273                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1274                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1275
1276         if (rc == 0) {
1277                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1278                                 (const char *) to_dentry->d_name.name,
1279                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1280                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1281
1282                 CIFSSMBClose(xid, pTcon, srcfid);
1283         }
1284
1285         return rc;
1286 }
1287
1288 int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1289         struct inode *target_dir, struct dentry *target_dentry)
1290 {
1291         char *fromName = NULL;
1292         char *toName = NULL;
1293         struct cifs_sb_info *cifs_sb_source;
1294         struct cifs_sb_info *cifs_sb_target;
1295         struct cifsTconInfo *tcon;
1296         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1297         FILE_UNIX_BASIC_INFO *info_buf_target;
1298         int xid, rc, tmprc;
1299
1300         cifs_sb_target = CIFS_SB(target_dir->i_sb);
1301         cifs_sb_source = CIFS_SB(source_dir->i_sb);
1302         tcon = cifs_sb_source->tcon;
1303
1304         xid = GetXid();
1305
1306         /*
1307          * BB: this might be allowed if same server, but different share.
1308          * Consider adding support for this
1309          */
1310         if (tcon != cifs_sb_target->tcon) {
1311                 rc = -EXDEV;
1312                 goto cifs_rename_exit;
1313         }
1314
1315         /*
1316          * we already have the rename sem so we do not need to
1317          * grab it again here to protect the path integrity
1318          */
1319         fromName = build_path_from_dentry(source_dentry);
1320         if (fromName == NULL) {
1321                 rc = -ENOMEM;
1322                 goto cifs_rename_exit;
1323         }
1324
1325         toName = build_path_from_dentry(target_dentry);
1326         if (toName == NULL) {
1327                 rc = -ENOMEM;
1328                 goto cifs_rename_exit;
1329         }
1330
1331         rc = cifs_do_rename(xid, source_dentry, fromName,
1332                             target_dentry, toName);
1333
1334         if (rc == -EEXIST && tcon->unix_ext) {
1335                 /*
1336                  * Are src and dst hardlinks of same inode? We can
1337                  * only tell with unix extensions enabled
1338                  */
1339                 info_buf_source =
1340                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1341                                         GFP_KERNEL);
1342                 if (info_buf_source == NULL) {
1343                         rc = -ENOMEM;
1344                         goto cifs_rename_exit;
1345                 }
1346
1347                 info_buf_target = info_buf_source + 1;
1348                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1349                                         info_buf_source,
1350                                         cifs_sb_source->local_nls,
1351                                         cifs_sb_source->mnt_cifs_flags &
1352                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1353                 if (tmprc != 0)
1354                         goto unlink_target;
1355
1356                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon,
1357                                         toName, info_buf_target,
1358                                         cifs_sb_target->local_nls,
1359                                         /* remap based on source sb */
1360                                         cifs_sb_source->mnt_cifs_flags &
1361                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1362
1363                 if (tmprc == 0 && (info_buf_source->UniqueId ==
1364                                    info_buf_target->UniqueId)) {
1365                         /* same file, POSIX says that this is a noop */
1366                         rc = 0;
1367                         goto cifs_rename_exit;
1368                 }
1369         } /* else ... BB we could add the same check for Windows by
1370                      checking the UniqueId via FILE_INTERNAL_INFO */
1371
1372 unlink_target:
1373         if ((rc == -EACCES) || (rc == -EEXIST)) {
1374                 tmprc = cifs_unlink(target_dir, target_dentry);
1375                 if (tmprc)
1376                         goto cifs_rename_exit;
1377
1378                 rc = cifs_do_rename(xid, source_dentry, fromName,
1379                                     target_dentry, toName);
1380         }
1381
1382 cifs_rename_exit:
1383         kfree(info_buf_source);
1384         kfree(fromName);
1385         kfree(toName);
1386         FreeXid(xid);
1387         return rc;
1388 }
1389
1390 int cifs_revalidate(struct dentry *direntry)
1391 {
1392         int xid;
1393         int rc = 0, wbrc = 0;
1394         char *full_path;
1395         struct cifs_sb_info *cifs_sb;
1396         struct cifsInodeInfo *cifsInode;
1397         loff_t local_size;
1398         struct timespec local_mtime;
1399         bool invalidate_inode = false;
1400
1401         if (direntry->d_inode == NULL)
1402                 return -ENOENT;
1403
1404         cifsInode = CIFS_I(direntry->d_inode);
1405
1406         if (cifsInode == NULL)
1407                 return -ENOENT;
1408
1409         /* no sense revalidating inode info on file that no one can write */
1410         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1411                 return rc;
1412
1413         xid = GetXid();
1414
1415         cifs_sb = CIFS_SB(direntry->d_sb);
1416
1417         /* can not safely grab the rename sem here if rename calls revalidate
1418            since that would deadlock */
1419         full_path = build_path_from_dentry(direntry);
1420         if (full_path == NULL) {
1421                 FreeXid(xid);
1422                 return -ENOMEM;
1423         }
1424         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1425                  "jiffies %ld", full_path, direntry->d_inode,
1426                  direntry->d_inode->i_count.counter, direntry,
1427                  direntry->d_time, jiffies));
1428
1429         if (cifsInode->time == 0) {
1430                 /* was set to zero previously to force revalidate */
1431         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1432                    lookupCacheEnabled) {
1433                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1434                     (direntry->d_inode->i_nlink == 1)) {
1435                         kfree(full_path);
1436                         FreeXid(xid);
1437                         return rc;
1438                 } else {
1439                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1440                 }
1441         }
1442
1443         /* save mtime and size */
1444         local_mtime = direntry->d_inode->i_mtime;
1445         local_size = direntry->d_inode->i_size;
1446
1447         if (cifs_sb->tcon->unix_ext) {
1448                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1449                                               direntry->d_sb, xid);
1450                 if (rc) {
1451                         cFYI(1, ("error on getting revalidate info %d", rc));
1452 /*                      if (rc != -ENOENT)
1453                                 rc = 0; */      /* BB should we cache info on
1454                                                    certain errors? */
1455                 }
1456         } else {
1457                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1458                                          direntry->d_sb, xid, NULL);
1459                 if (rc) {
1460                         cFYI(1, ("error on getting revalidate info %d", rc));
1461 /*                      if (rc != -ENOENT)
1462                                 rc = 0; */      /* BB should we cache info on
1463                                                    certain errors? */
1464                 }
1465         }
1466         /* should we remap certain errors, access denied?, to zero */
1467
1468         /* if not oplocked, we invalidate inode pages if mtime or file size
1469            had changed on server */
1470
1471         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1472             (local_size == direntry->d_inode->i_size)) {
1473                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1474         } else {
1475                 /* file may have changed on server */
1476                 if (cifsInode->clientCanCacheRead) {
1477                         /* no need to invalidate inode pages since we were the
1478                            only ones who could have modified the file and the
1479                            server copy is staler than ours */
1480                 } else {
1481                         invalidate_inode = true;
1482                 }
1483         }
1484
1485         /* can not grab this sem since kernel filesys locking documentation
1486            indicates i_mutex may be taken by the kernel on lookup and rename
1487            which could deadlock if we grab the i_mutex here as well */
1488 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1489         /* need to write out dirty pages here  */
1490         if (direntry->d_inode->i_mapping) {
1491                 /* do we need to lock inode until after invalidate completes
1492                    below? */
1493                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1494                 if (wbrc)
1495                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1496         }
1497         if (invalidate_inode) {
1498         /* shrink_dcache not necessary now that cifs dentry ops
1499         are exported for negative dentries */
1500 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1501                         shrink_dcache_parent(direntry); */
1502                 if (S_ISREG(direntry->d_inode->i_mode)) {
1503                         if (direntry->d_inode->i_mapping) {
1504                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1505                                 if (wbrc)
1506                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1507                         }
1508                         /* may eventually have to do this for open files too */
1509                         if (list_empty(&(cifsInode->openFileList))) {
1510                                 /* changed on server - flush read ahead pages */
1511                                 cFYI(1, ("Invalidating read ahead data on "
1512                                          "closed file"));
1513                                 invalidate_remote_inode(direntry->d_inode);
1514                         }
1515                 }
1516         }
1517 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1518
1519         kfree(full_path);
1520         FreeXid(xid);
1521         return rc;
1522 }
1523
1524 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1525         struct kstat *stat)
1526 {
1527         int err = cifs_revalidate(dentry);
1528         if (!err) {
1529                 generic_fillattr(dentry->d_inode, stat);
1530                 stat->blksize = CIFS_MAX_MSGSIZE;
1531         }
1532         return err;
1533 }
1534
1535 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1536 {
1537         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1538         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1539         struct page *page;
1540         int rc = 0;
1541
1542         page = grab_cache_page(mapping, index);
1543         if (!page)
1544                 return -ENOMEM;
1545
1546         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1547         unlock_page(page);
1548         page_cache_release(page);
1549         return rc;
1550 }
1551
1552 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1553 {
1554         struct address_space *mapping = inode->i_mapping;
1555         unsigned long limit;
1556
1557         spin_lock(&inode->i_lock);
1558         if (inode->i_size < offset)
1559                 goto do_expand;
1560         /*
1561          * truncation of in-use swapfiles is disallowed - it would cause
1562          * subsequent swapout to scribble on the now-freed blocks.
1563          */
1564         if (IS_SWAPFILE(inode)) {
1565                 spin_unlock(&inode->i_lock);
1566                 goto out_busy;
1567         }
1568         i_size_write(inode, offset);
1569         spin_unlock(&inode->i_lock);
1570         /*
1571          * unmap_mapping_range is called twice, first simply for efficiency
1572          * so that truncate_inode_pages does fewer single-page unmaps. However
1573          * after this first call, and before truncate_inode_pages finishes,
1574          * it is possible for private pages to be COWed, which remain after
1575          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1576          * call must be made for correctness.
1577          */
1578         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1579         truncate_inode_pages(mapping, offset);
1580         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1581         goto out_truncate;
1582
1583 do_expand:
1584         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1585         if (limit != RLIM_INFINITY && offset > limit) {
1586                 spin_unlock(&inode->i_lock);
1587                 goto out_sig;
1588         }
1589         if (offset > inode->i_sb->s_maxbytes) {
1590                 spin_unlock(&inode->i_lock);
1591                 goto out_big;
1592         }
1593         i_size_write(inode, offset);
1594         spin_unlock(&inode->i_lock);
1595 out_truncate:
1596         if (inode->i_op && inode->i_op->truncate)
1597                 inode->i_op->truncate(inode);
1598         return 0;
1599 out_sig:
1600         send_sig(SIGXFSZ, current, 0);
1601 out_big:
1602         return -EFBIG;
1603 out_busy:
1604         return -ETXTBSY;
1605 }
1606
1607 static int
1608 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1609                    int xid, char *full_path)
1610 {
1611         int rc;
1612         struct cifsFileInfo *open_file;
1613         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1614         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1615         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1616
1617         /*
1618          * To avoid spurious oplock breaks from server, in the case of
1619          * inodes that we already have open, avoid doing path based
1620          * setting of file size if we can do it by handle.
1621          * This keeps our caching token (oplock) and avoids timeouts
1622          * when the local oplock break takes longer to flush
1623          * writebehind data than the SMB timeout for the SetPathInfo
1624          * request would allow
1625          */
1626         open_file = find_writable_file(cifsInode);
1627         if (open_file) {
1628                 __u16 nfid = open_file->netfid;
1629                 __u32 npid = open_file->pid;
1630                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1631                                         npid, false);
1632                 atomic_dec(&open_file->wrtPending);
1633                 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1634                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1635                         unsigned int bytes_written;
1636                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1637                                           &bytes_written, NULL, NULL, 1);
1638                         cFYI(1, ("Wrt seteof rc %d", rc));
1639                 }
1640         } else
1641                 rc = -EINVAL;
1642
1643         if (rc != 0) {
1644                 /* Set file size by pathname rather than by handle
1645                    either because no valid, writeable file handle for
1646                    it was found or because there was an error setting
1647                    it by handle */
1648                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1649                                    false, cifs_sb->local_nls,
1650                                    cifs_sb->mnt_cifs_flags &
1651                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1652                 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1653                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1654                         __u16 netfid;
1655                         int oplock = 0;
1656
1657                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1658                                 FILE_OPEN, GENERIC_WRITE,
1659                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1660                                 cifs_sb->local_nls,
1661                                 cifs_sb->mnt_cifs_flags &
1662                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1663                         if (rc == 0) {
1664                                 unsigned int bytes_written;
1665                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1666                                                   attrs->ia_size,
1667                                                   &bytes_written, NULL,
1668                                                   NULL, 1);
1669                                 cFYI(1, ("wrt seteof rc %d", rc));
1670                                 CIFSSMBClose(xid, pTcon, netfid);
1671                         }
1672                 }
1673         }
1674
1675         if (rc == 0) {
1676                 rc = cifs_vmtruncate(inode, attrs->ia_size);
1677                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1678         }
1679
1680         return rc;
1681 }
1682
1683 static int
1684 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1685 {
1686         int rc;
1687         int xid;
1688         char *full_path = NULL;
1689         struct inode *inode = direntry->d_inode;
1690         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1691         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1692         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1693         struct cifs_unix_set_info_args *args = NULL;
1694
1695         cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1696                  direntry->d_name.name, attrs->ia_valid));
1697
1698         xid = GetXid();
1699
1700         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1701                 /* check if we have permission to change attrs */
1702                 rc = inode_change_ok(inode, attrs);
1703                 if (rc < 0)
1704                         goto out;
1705                 else
1706                         rc = 0;
1707         }
1708
1709         full_path = build_path_from_dentry(direntry);
1710         if (full_path == NULL) {
1711                 rc = -ENOMEM;
1712                 goto out;
1713         }
1714
1715         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1716                 /*
1717                    Flush data before changing file size or changing the last
1718                    write time of the file on the server. If the
1719                    flush returns error, store it to report later and continue.
1720                    BB: This should be smarter. Why bother flushing pages that
1721                    will be truncated anyway? Also, should we error out here if
1722                    the flush returns error?
1723                  */
1724                 rc = filemap_write_and_wait(inode->i_mapping);
1725                 if (rc != 0) {
1726                         cifsInode->write_behind_rc = rc;
1727                         rc = 0;
1728                 }
1729         }
1730
1731         if (attrs->ia_valid & ATTR_SIZE) {
1732                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1733                 if (rc != 0)
1734                         goto out;
1735         }
1736
1737         /* skip mode change if it's just for clearing setuid/setgid */
1738         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1739                 attrs->ia_valid &= ~ATTR_MODE;
1740
1741         args = kmalloc(sizeof(*args), GFP_KERNEL);
1742         if (args == NULL) {
1743                 rc = -ENOMEM;
1744                 goto out;
1745         }
1746
1747         /* set up the struct */
1748         if (attrs->ia_valid & ATTR_MODE)
1749                 args->mode = attrs->ia_mode;
1750         else
1751                 args->mode = NO_CHANGE_64;
1752
1753         if (attrs->ia_valid & ATTR_UID)
1754                 args->uid = attrs->ia_uid;
1755         else
1756                 args->uid = NO_CHANGE_64;
1757
1758         if (attrs->ia_valid & ATTR_GID)
1759                 args->gid = attrs->ia_gid;
1760         else
1761                 args->gid = NO_CHANGE_64;
1762
1763         if (attrs->ia_valid & ATTR_ATIME)
1764                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1765         else
1766                 args->atime = NO_CHANGE_64;
1767
1768         if (attrs->ia_valid & ATTR_MTIME)
1769                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1770         else
1771                 args->mtime = NO_CHANGE_64;
1772
1773         if (attrs->ia_valid & ATTR_CTIME)
1774                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1775         else
1776                 args->ctime = NO_CHANGE_64;
1777
1778         args->device = 0;
1779         rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1780                                 cifs_sb->local_nls,
1781                                 cifs_sb->mnt_cifs_flags &
1782                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1783
1784         if (!rc)
1785                 rc = inode_setattr(inode, attrs);
1786 out:
1787         kfree(args);
1788         kfree(full_path);
1789         FreeXid(xid);
1790         return rc;
1791 }
1792
1793 static int
1794 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1795 {
1796         int xid;
1797         struct inode *inode = direntry->d_inode;
1798         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1799         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1800         char *full_path = NULL;
1801         int rc = -EACCES;
1802         __u32 dosattr = 0;
1803         __u64 mode = NO_CHANGE_64;
1804
1805         xid = GetXid();
1806
1807         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1808                  direntry->d_name.name, attrs->ia_valid));
1809
1810         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1811                 /* check if we have permission to change attrs */
1812                 rc = inode_change_ok(inode, attrs);
1813                 if (rc < 0) {
1814                         FreeXid(xid);
1815                         return rc;
1816                 } else
1817                         rc = 0;
1818         }
1819
1820         full_path = build_path_from_dentry(direntry);
1821         if (full_path == NULL) {
1822                 FreeXid(xid);
1823                 return -ENOMEM;
1824         }
1825
1826         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1827                 /*
1828                    Flush data before changing file size or changing the last
1829                    write time of the file on the server. If the
1830                    flush returns error, store it to report later and continue.
1831                    BB: This should be smarter. Why bother flushing pages that
1832                    will be truncated anyway? Also, should we error out here if
1833                    the flush returns error?
1834                  */
1835                 rc = filemap_write_and_wait(inode->i_mapping);
1836                 if (rc != 0) {
1837                         cifsInode->write_behind_rc = rc;
1838                         rc = 0;
1839                 }
1840         }
1841
1842         if (attrs->ia_valid & ATTR_SIZE) {
1843                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1844                 if (rc != 0)
1845                         goto cifs_setattr_exit;
1846         }
1847
1848         /*
1849          * Without unix extensions we can't send ownership changes to the
1850          * server, so silently ignore them. This is consistent with how
1851          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1852          * CIFSACL support + proper Windows to Unix idmapping, we may be
1853          * able to support this in the future.
1854          */
1855         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1856                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1857
1858         /* skip mode change if it's just for clearing setuid/setgid */
1859         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1860                 attrs->ia_valid &= ~ATTR_MODE;
1861
1862         if (attrs->ia_valid & ATTR_MODE) {
1863                 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1864                 mode = attrs->ia_mode;
1865         }
1866
1867         if (attrs->ia_valid & ATTR_MODE) {
1868                 rc = 0;
1869 #ifdef CONFIG_CIFS_EXPERIMENTAL
1870                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1871                         rc = mode_to_acl(inode, full_path, mode);
1872                 else
1873 #endif
1874                 if (((mode & S_IWUGO) == 0) &&
1875                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1876
1877                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1878
1879                         /* fix up mode if we're not using dynperm */
1880                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1881                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1882                 } else if ((mode & S_IWUGO) &&
1883                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
1884
1885                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1886                         /* Attributes of 0 are ignored */
1887                         if (dosattr == 0)
1888                                 dosattr |= ATTR_NORMAL;
1889
1890                         /* reset local inode permissions to normal */
1891                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1892                                 attrs->ia_mode &= ~(S_IALLUGO);
1893                                 if (S_ISDIR(inode->i_mode))
1894                                         attrs->ia_mode |=
1895                                                 cifs_sb->mnt_dir_mode;
1896                                 else
1897                                         attrs->ia_mode |=
1898                                                 cifs_sb->mnt_file_mode;
1899                         }
1900                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1901                         /* ignore mode change - ATTR_READONLY hasn't changed */
1902                         attrs->ia_valid &= ~ATTR_MODE;
1903                 }
1904         }
1905
1906         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1907             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1908                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1909                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1910
1911                 /* Even if error on time set, no sense failing the call if
1912                 the server would set the time to a reasonable value anyway,
1913                 and this check ensures that we are not being called from
1914                 sys_utimes in which case we ought to fail the call back to
1915                 the user when the server rejects the call */
1916                 if ((rc) && (attrs->ia_valid &
1917                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1918                         rc = 0;
1919         }
1920
1921         /* do not need local check to inode_check_ok since the server does
1922            that */
1923         if (!rc)
1924                 rc = inode_setattr(inode, attrs);
1925 cifs_setattr_exit:
1926         kfree(full_path);
1927         FreeXid(xid);
1928         return rc;
1929 }
1930
1931 int
1932 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1933 {
1934         struct inode *inode = direntry->d_inode;
1935         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1936         struct cifsTconInfo *pTcon = cifs_sb->tcon;
1937
1938         if (pTcon->unix_ext)
1939                 return cifs_setattr_unix(direntry, attrs);
1940
1941         return cifs_setattr_nounix(direntry, attrs);
1942
1943         /* BB: add cifs_setattr_legacy for really old servers */
1944 }
1945
1946 #if 0
1947 void cifs_delete_inode(struct inode *inode)
1948 {
1949         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1950         /* may have to add back in if and when safe distributed caching of
1951            directories added e.g. via FindNotify */
1952 }
1953 #endif