fs/cifs/inode.c

   1 /*
   2  *   fs/cifs/inode.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2005
   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 int cifs_get_inode_info_unix(struct inode **pinode,
  33         const unsigned char *search_path, struct super_block *sb, int xid)
  34 {
  35         int rc = 0;
  36         FILE_UNIX_BASIC_INFO findData;
  37         struct cifsTconInfo *pTcon;
  38         struct inode *inode;
  39         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
  40         char *tmp_path;
  41
  42         pTcon = cifs_sb->tcon;
  43         cFYI(1, ("Getting info on %s", search_path));
  44         /* could have done a find first instead but this returns more info */
  45         rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
  46                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
  47                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
  48 /*      dump_mem("\nUnixQPathInfo return data", &findData,
  49                  sizeof(findData)); */
  50         if (rc) {
  51                 if (rc == -EREMOTE) {
  52                         tmp_path =
  53                             kmalloc(strnlen(pTcon->treeName,
  54                                             MAX_TREE_SIZE + 1) +
  55                                     strnlen(search_path, MAX_PATHCONF) + 1,
  56                                     GFP_KERNEL);
  57                         if (tmp_path == NULL) {
  58                                 return -ENOMEM;
  59                         }
  60                         /* have to skip first of the double backslash of
  61                            UNC name */
  62                         strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
  63                         strncat(tmp_path, search_path, MAX_PATHCONF);
  64                         rc = connect_to_dfs_path(xid, pTcon->ses,
  65                                                  /* treename + */ tmp_path,
  66                                                  cifs_sb->local_nls,
  67                                                  cifs_sb->mnt_cifs_flags &
  68                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
  69                         kfree(tmp_path);
  70
  71                         /* BB fix up inode etc. */
  72                 } else if (rc) {
  73                         return rc;
  74                 }
  75         } else {
  76                 struct cifsInodeInfo *cifsInfo;
  77                 __u32 type = le32_to_cpu(findData.Type);
  78                 __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
  79                 __u64 end_of_file = le64_to_cpu(findData.EndOfFile);
  80
  81                 /* get new inode */
  82                 if (*pinode == NULL) {
  83                         *pinode = new_inode(sb);
  84                         if (*pinode == NULL)
  85                                 return -ENOMEM;
  86                         /* Is an i_ino of zero legal? */
  87                         /* Are there sanity checks we can use to ensure that
  88                            the server is really filling in that field? */
  89                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
  90                                 (*pinode)->i_ino =
  91                                         (unsigned long)findData.UniqueId;
  92                         } /* note ino incremented to unique num in new_inode */
  93                         insert_inode_hash(*pinode);
  94                 }
  95
  96                 inode = *pinode;
  97                 cifsInfo = CIFS_I(inode);
  98
  99                 cFYI(1, ("Old time %ld", cifsInfo->time));
 100                 cifsInfo->time = jiffies;
 101                 cFYI(1, ("New time %ld", cifsInfo->time));
 102                 /* this is ok to set on every inode revalidate */
 103                 atomic_set(&cifsInfo->inUse,1);
 104
 105                 inode->i_atime =
 106                     cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime));
 107                 inode->i_mtime =
 108                     cifs_NTtimeToUnix(le64_to_cpu
 109                                 (findData.LastModificationTime));
 110                 inode->i_ctime =
 111                     cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange));
 112                 inode->i_mode = le64_to_cpu(findData.Permissions);
 113                 /* since we set the inode type below we need to mask off
 114                    to avoid strange results if bits set above */
 115                         inode->i_mode &= ~S_IFMT;
 116                 if (type == UNIX_FILE) {
 117                         inode->i_mode |= S_IFREG;
 118                 } else if (type == UNIX_SYMLINK) {
 119                         inode->i_mode |= S_IFLNK;
 120                 } else if (type == UNIX_DIR) {
 121                         inode->i_mode |= S_IFDIR;
 122                 } else if (type == UNIX_CHARDEV) {
 123                         inode->i_mode |= S_IFCHR;
 124                         inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
 125                                 le64_to_cpu(findData.DevMinor) & MINORMASK);
 126                 } else if (type == UNIX_BLOCKDEV) {
 127                         inode->i_mode |= S_IFBLK;
 128                         inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
 129                                 le64_to_cpu(findData.DevMinor) & MINORMASK);
 130                 } else if (type == UNIX_FIFO) {
 131                         inode->i_mode |= S_IFIFO;
 132                 } else if (type == UNIX_SOCKET) {
 133                         inode->i_mode |= S_IFSOCK;
 134                 } else {
 135                         /* safest to call it a file if we do not know */
 136                         inode->i_mode |= S_IFREG;
 137                         cFYI(1,("unknown type %d",type));
 138                 }
 139                 inode->i_uid = le64_to_cpu(findData.Uid);
 140                 inode->i_gid = le64_to_cpu(findData.Gid);
 141                 inode->i_nlink = le64_to_cpu(findData.Nlinks);
 142
 143                 if (is_size_safe_to_change(cifsInfo)) {
 144                 /* can not safely change the file size here if the
 145                    client is writing to it due to potential races */
 146
 147                         i_size_write(inode, end_of_file);
 148
 149                 /* blksize needs to be multiple of two. So safer to default to
 150                 blksize and blkbits set in superblock so 2**blkbits and blksize
 151                 will match rather than setting to:
 152                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 153
 154                 /* This seems incredibly stupid but it turns out that i_blocks
 155                    is not related to (i_size / i_blksize), instead 512 byte size
 156                    is required for calculating num blocks */
 157
 158                 /* 512 bytes (2**9) is the fake blocksize that must be used */
 159                 /* for this calculation */
 160                         inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 161                 }
 162
 163                 if (num_of_bytes < end_of_file)
 164                         cFYI(1, ("allocation size less than end of file"));
 165                 cFYI(1, ("Size %ld and blocks %llu",
 166                         (unsigned long) inode->i_size,
 167                         (unsigned long long)inode->i_blocks));
 168                 if (S_ISREG(inode->i_mode)) {
 169                         cFYI(1, ("File inode"));
 170                         inode->i_op = &cifs_file_inode_ops;
 171                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 172                                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 173                                         inode->i_fop =
 174                                                 &cifs_file_direct_nobrl_ops;
 175                                 else
 176                                         inode->i_fop = &cifs_file_direct_ops;
 177                         } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 178                                 inode->i_fop = &cifs_file_nobrl_ops;
 179                         else /* not direct, send byte range locks */
 180                                 inode->i_fop = &cifs_file_ops;
 181
 182                         /* check if server can support readpages */
 183                         if(pTcon->ses->server->maxBuf <
 184                             PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
 185                                 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 186                         else
 187                                 inode->i_data.a_ops = &cifs_addr_ops;
 188                 } else if (S_ISDIR(inode->i_mode)) {
 189                         cFYI(1, ("Directory inode"));
 190                         inode->i_op = &cifs_dir_inode_ops;
 191                         inode->i_fop = &cifs_dir_ops;
 192                 } else if (S_ISLNK(inode->i_mode)) {
 193                         cFYI(1, ("Symbolic Link inode"));
 194                         inode->i_op = &cifs_symlink_inode_ops;
 195                 /* tmp_inode->i_fop = */ /* do not need to set to anything */
 196                 } else {
 197                         cFYI(1, ("Init special inode"));
 198                         init_special_inode(inode, inode->i_mode,
 199                                            inode->i_rdev);
 200                 }
 201         }
 202         return rc;
 203 }
 204
 205 static int decode_sfu_inode(struct inode * inode, __u64 size,
 206                             const unsigned char *path,
 207                             struct cifs_sb_info *cifs_sb, int xid)
 208 {
 209         int rc;
 210         int oplock = FALSE;
 211         __u16 netfid;
 212         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 213         char buf[24];
 214         unsigned int bytes_read;
 215         char * pbuf;
 216
 217         pbuf = buf;
 218
 219         if(size == 0) {
 220                 inode->i_mode |= S_IFIFO;
 221                 return 0;
 222         } else if (size < 8) {
 223                 return -EINVAL;  /* EOPNOTSUPP? */
 224         }
 225
 226         rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
 227                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 228                          cifs_sb->local_nls,
 229                          cifs_sb->mnt_cifs_flags &
 230                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 231         if (rc==0) {
 232                 int buf_type = CIFS_NO_BUFFER;
 233                         /* Read header */
 234                 rc = CIFSSMBRead(xid, pTcon,
 235                                  netfid,
 236                                  24 /* length */, 0 /* offset */,
 237                                  &bytes_read, &pbuf, &buf_type);
 238                 if((rc == 0) && (bytes_read >= 8)) {
 239                         if(memcmp("IntxBLK", pbuf, 8) == 0) {
 240                                 cFYI(1,("Block device"));
 241                                 inode->i_mode |= S_IFBLK;
 242                                 if(bytes_read == 24) {
 243                                         /* we have enough to decode dev num */
 244                                         __u64 mjr; /* major */
 245                                         __u64 mnr; /* minor */
 246                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 247                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 248                                         inode->i_rdev = MKDEV(mjr, mnr);
 249                                 }
 250                         } else if(memcmp("IntxCHR", pbuf, 8) == 0) {
 251                                 cFYI(1,("Char device"));
 252                                 inode->i_mode |= S_IFCHR;
 253                                 if(bytes_read == 24) {
 254                                         /* we have enough to decode dev num */
 255                                         __u64 mjr; /* major */
 256                                         __u64 mnr; /* minor */
 257                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 258                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 259                                         inode->i_rdev = MKDEV(mjr, mnr);
 260                                 }
 261                         } else if(memcmp("IntxLNK", pbuf, 7) == 0) {
 262                                 cFYI(1,("Symlink"));
 263                                 inode->i_mode |= S_IFLNK;
 264                         } else {
 265                                 inode->i_mode |= S_IFREG; /* file? */
 266                                 rc = -EOPNOTSUPP;
 267                         }
 268                 } else {
 269                         inode->i_mode |= S_IFREG; /* then it is a file */
 270                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 271                 }
 272                 CIFSSMBClose(xid, pTcon, netfid);
 273         }
 274         return rc;
 275
 276 }
 277
 278 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 279
 280 static int get_sfu_uid_mode(struct inode * inode,
 281                         const unsigned char *path,
 282                         struct cifs_sb_info *cifs_sb, int xid)
 283 {
 284 #ifdef CONFIG_CIFS_XATTR
 285         ssize_t rc;
 286         char ea_value[4];
 287         __u32 mode;
 288
 289         rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
 290                         ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 291                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 292         if(rc < 0)
 293                 return (int)rc;
 294         else if (rc > 3) {
 295                 mode = le32_to_cpu(*((__le32 *)ea_value));
 296                 inode->i_mode &= ~SFBITS_MASK;
 297                 cFYI(1,("special bits 0%o org mode 0%o", mode, inode->i_mode));
 298                 inode->i_mode = (mode &  SFBITS_MASK) | inode->i_mode;
 299                 cFYI(1,("special mode bits 0%o", mode));
 300                 return 0;
 301         } else {
 302                 return 0;
 303         }
 304 #else
 305         return -EOPNOTSUPP;
 306 #endif
 307
 308
 309 }
 310
 311 int cifs_get_inode_info(struct inode **pinode,
 312         const unsigned char *search_path, FILE_ALL_INFO *pfindData,
 313         struct super_block *sb, int xid)
 314 {
 315         int rc = 0;
 316         struct cifsTconInfo *pTcon;
 317         struct inode *inode;
 318         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 319         char *tmp_path;
 320         char *buf = NULL;
 321         int adjustTZ = FALSE;
 322
 323         pTcon = cifs_sb->tcon;
 324         cFYI(1,("Getting info on %s", search_path));
 325
 326         if ((pfindData == NULL) && (*pinode != NULL)) {
 327                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 328                         cFYI(1,("No need to revalidate cached inode sizes"));
 329                         return rc;
 330                 }
 331         }
 332
 333         /* if file info not passed in then get it from server */
 334         if (pfindData == NULL) {
 335                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 336                 if (buf == NULL)
 337                         return -ENOMEM;
 338                 pfindData = (FILE_ALL_INFO *)buf;
 339                 /* could do find first instead but this returns more info */
 340                 rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
 341                               0 /* not legacy */,
 342                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 343                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 344                 /* BB optimize code so we do not make the above call
 345                 when server claims no NT SMB support and the above call
 346                 failed at least once - set flag in tcon or mount */
 347                 if((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 348                         rc = SMBQueryInformation(xid, pTcon, search_path,
 349                                         pfindData, cifs_sb->local_nls,
 350                                         cifs_sb->mnt_cifs_flags &
 351                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 352                         adjustTZ = TRUE;
 353                 }
 354
 355         }
 356         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
 357         if (rc) {
 358                 if (rc == -EREMOTE) {
 359                         tmp_path =
 360                             kmalloc(strnlen
 361                                     (pTcon->treeName,
 362                                      MAX_TREE_SIZE + 1) +
 363                                     strnlen(search_path, MAX_PATHCONF) + 1,
 364                                     GFP_KERNEL);
 365                         if (tmp_path == NULL) {
 366                                 kfree(buf);
 367                                 return -ENOMEM;
 368                         }
 369
 370                         strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
 371                         strncat(tmp_path, search_path, MAX_PATHCONF);
 372                         rc = connect_to_dfs_path(xid, pTcon->ses,
 373                                                  /* treename + */ tmp_path,
 374                                                  cifs_sb->local_nls,
 375                                                  cifs_sb->mnt_cifs_flags &
 376                                                    CIFS_MOUNT_MAP_SPECIAL_CHR);
 377                         kfree(tmp_path);
 378                         /* BB fix up inode etc. */
 379                 } else if (rc) {
 380                         kfree(buf);
 381                         return rc;
 382                 }
 383         } else {
 384                 struct cifsInodeInfo *cifsInfo;
 385                 __u32 attr = le32_to_cpu(pfindData->Attributes);
 386
 387                 /* get new inode */
 388                 if (*pinode == NULL) {
 389                         *pinode = new_inode(sb);
 390                         if (*pinode == NULL) {
 391                                 kfree(buf);
 392                                 return -ENOMEM;
 393                         }
 394                         /* Is an i_ino of zero legal? Can we use that to check
 395                            if the server supports returning inode numbers?  Are
 396                            there other sanity checks we can use to ensure that
 397                            the server is really filling in that field? */
 398
 399                         /* We can not use the IndexNumber field by default from
 400                            Windows or Samba (in ALL_INFO buf) but we can request
 401                            it explicitly.  It may not be unique presumably if
 402                            the server has multiple devices mounted under one
 403                            share */
 404
 405                         /* There may be higher info levels that work but are
 406                            there Windows server or network appliances for which
 407                            IndexNumber field is not guaranteed unique? */
 408
 409                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM){
 410                                 int rc1 = 0;
 411                                 __u64 inode_num;
 412
 413                                 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 414                                         search_path, &inode_num,
 415                                         cifs_sb->local_nls,
 416                                         cifs_sb->mnt_cifs_flags &
 417                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 418                                 if (rc1) {
 419                                         cFYI(1,("GetSrvInodeNum rc %d", rc1));
 420                                         /* BB EOPNOSUPP disable SERVER_INUM? */
 421                                 } else /* do we need cast or hash to ino? */
 422                                         (*pinode)->i_ino = inode_num;
 423                         } /* else ino incremented to unique num in new_inode*/
 424                         insert_inode_hash(*pinode);
 425                 }
 426                 inode = *pinode;
 427                 cifsInfo = CIFS_I(inode);
 428                 cifsInfo->cifsAttrs = attr;
 429                 cFYI(1, ("Old time %ld", cifsInfo->time));
 430                 cifsInfo->time = jiffies;
 431                 cFYI(1, ("New time %ld", cifsInfo->time));
 432
 433                 /* blksize needs to be multiple of two. So safer to default to
 434                 blksize and blkbits set in superblock so 2**blkbits and blksize
 435                 will match rather than setting to:
 436                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 437
 438                 /* Linux can not store file creation time so ignore it */
 439                 if(pfindData->LastAccessTime)
 440                         inode->i_atime = cifs_NTtimeToUnix
 441                                 (le64_to_cpu(pfindData->LastAccessTime));
 442                 else /* do not need to use current_fs_time - time not stored */
 443                         inode->i_atime = CURRENT_TIME;
 444                 inode->i_mtime =
 445                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 446                 inode->i_ctime =
 447                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 448                 cFYI(0, ("Attributes came in as 0x%x", attr));
 449                 if(adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
 450                         inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
 451                         inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
 452                 }
 453
 454                 /* set default mode. will override for dirs below */
 455                 if (atomic_read(&cifsInfo->inUse) == 0)
 456                         /* new inode, can safely set these fields */
 457                         inode->i_mode = cifs_sb->mnt_file_mode;
 458                 else /* since we set the inode type below we need to mask off
 459                      to avoid strange results if type changes and both get orred in */
 460                         inode->i_mode &= ~S_IFMT;
 461 /*              if (attr & ATTR_REPARSE)  */
 462                 /* We no longer handle these as symlinks because we could not
 463                    follow them due to the absolute path with drive letter */
 464                 if (attr & ATTR_DIRECTORY) {
 465                 /* override default perms since we do not do byte range locking
 466                    on dirs */
 467                         inode->i_mode = cifs_sb->mnt_dir_mode;
 468                         inode->i_mode |= S_IFDIR;
 469                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 470                            (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
 471                            /* No need to le64 convert size of zero */
 472                            (pfindData->EndOfFile == 0)) {
 473                         inode->i_mode = cifs_sb->mnt_file_mode;
 474                         inode->i_mode |= S_IFIFO;
 475 /* BB Finish for SFU style symlinks and devices */
 476                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 477                            (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
 478                         if (decode_sfu_inode(inode,
 479                                          le64_to_cpu(pfindData->EndOfFile),
 480                                          search_path,
 481                                          cifs_sb, xid)) {
 482                                 cFYI(1,("Unrecognized sfu inode type"));
 483                         }
 484                         cFYI(1,("sfu mode 0%o",inode->i_mode));
 485                 } else {
 486                         inode->i_mode |= S_IFREG;
 487                         /* treat the dos attribute of read-only as read-only
 488                            mode e.g. 555 */
 489                         if (cifsInfo->cifsAttrs & ATTR_READONLY)
 490                                 inode->i_mode &= ~(S_IWUGO);
 491                         else if ((inode->i_mode & S_IWUGO) == 0)
 492                                 /* the ATTR_READONLY flag may have been */
 493                                 /* changed on server -- set any w bits  */
 494                                 /* allowed by mnt_file_mode             */
 495                                 inode->i_mode |= (S_IWUGO &
 496                                                   cifs_sb->mnt_file_mode);
 497                 /* BB add code here -
 498                    validate if device or weird share or device type? */
 499                 }
 500                 if (is_size_safe_to_change(cifsInfo)) {
 501                         /* can not safely change the file size here if the
 502                            client is writing to it due to potential races */
 503                         i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));
 504
 505                         /* 512 bytes (2**9) is the fake blocksize that must be
 506                            used for this calculation */
 507                         inode->i_blocks = (512 - 1 + le64_to_cpu(
 508                                            pfindData->AllocationSize)) >> 9;
 509                 }
 510
 511                 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 512
 513                 /* BB fill in uid and gid here? with help from winbind?
 514                    or retrieve from NTFS stream extended attribute */
 515                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 516                         /* fill in uid, gid, mode from server ACL */
 517                         get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
 518                 } else if (atomic_read(&cifsInfo->inUse) == 0) {
 519                         inode->i_uid = cifs_sb->mnt_uid;
 520                         inode->i_gid = cifs_sb->mnt_gid;
 521                         /* set so we do not keep refreshing these fields with
 522                            bad data after user has changed them in memory */
 523                         atomic_set(&cifsInfo->inUse,1);
 524                 }
 525
 526                 if (S_ISREG(inode->i_mode)) {
 527                         cFYI(1, ("File inode"));
 528                         inode->i_op = &cifs_file_inode_ops;
 529                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 530                                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 531                                         inode->i_fop =
 532                                                 &cifs_file_direct_nobrl_ops;
 533                                 else
 534                                         inode->i_fop = &cifs_file_direct_ops;
 535                         } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 536                                 inode->i_fop = &cifs_file_nobrl_ops;
 537                         else /* not direct, send byte range locks */
 538                                 inode->i_fop = &cifs_file_ops;
 539
 540                         if(pTcon->ses->server->maxBuf <
 541                              PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
 542                                 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 543                         else
 544                                 inode->i_data.a_ops = &cifs_addr_ops;
 545                 } else if (S_ISDIR(inode->i_mode)) {
 546                         cFYI(1, ("Directory inode"));
 547                         inode->i_op = &cifs_dir_inode_ops;
 548                         inode->i_fop = &cifs_dir_ops;
 549                 } else if (S_ISLNK(inode->i_mode)) {
 550                         cFYI(1, ("Symbolic Link inode"));
 551                         inode->i_op = &cifs_symlink_inode_ops;
 552                 } else {
 553                         init_special_inode(inode, inode->i_mode,
 554                                            inode->i_rdev);
 555                 }
 556         }
 557         kfree(buf);
 558         return rc;
 559 }
 560
 561 /* gets root inode */
 562 void cifs_read_inode(struct inode *inode)
 563 {
 564         int xid;
 565         struct cifs_sb_info *cifs_sb;
 566
 567         cifs_sb = CIFS_SB(inode->i_sb);
 568         xid = GetXid();
 569         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
 570                 cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
 571         else
 572                 cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
 573         /* can not call macro FreeXid here since in a void func */
 574         _FreeXid(xid);
 575 }
 576
 577 int cifs_unlink(struct inode *inode, struct dentry *direntry)
 578 {
 579         int rc = 0;
 580         int xid;
 581         struct cifs_sb_info *cifs_sb;
 582         struct cifsTconInfo *pTcon;
 583         char *full_path = NULL;
 584         struct cifsInodeInfo *cifsInode;
 585         FILE_BASIC_INFO *pinfo_buf;
 586
 587         cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
 588
 589         xid = GetXid();
 590
 591         if(inode)
 592                 cifs_sb = CIFS_SB(inode->i_sb);
 593         else
 594                 cifs_sb = CIFS_SB(direntry->d_sb);
 595         pTcon = cifs_sb->tcon;
 596
 597         /* Unlink can be called from rename so we can not grab the sem here
 598            since we deadlock otherwise */
 599 /*      mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
 600         full_path = build_path_from_dentry(direntry);
 601 /*      mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
 602         if (full_path == NULL) {
 603                 FreeXid(xid);
 604                 return -ENOMEM;
 605         }
 606         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
 607                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 608
 609         if (!rc) {
 610                 if (direntry->d_inode)
 611                         drop_nlink(direntry->d_inode);
 612         } else if (rc == -ENOENT) {
 613                 d_drop(direntry);
 614         } else if (rc == -ETXTBSY) {
 615                 int oplock = FALSE;
 616                 __u16 netfid;
 617
 618                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
 619                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
 620                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
 621                                  cifs_sb->mnt_cifs_flags &
 622                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 623                 if (rc==0) {
 624                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
 625                                               cifs_sb->local_nls,
 626                                               cifs_sb->mnt_cifs_flags &
 627                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 628                         CIFSSMBClose(xid, pTcon, netfid);
 629                         if (direntry->d_inode)
 630                                 drop_nlink(direntry->d_inode);
 631                 }
 632         } else if (rc == -EACCES) {
 633                 /* try only if r/o attribute set in local lookup data? */
 634                 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
 635                 if (pinfo_buf) {
 636                         /* ATTRS set to normal clears r/o bit */
 637                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
 638                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
 639                                 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
 640                                                      pinfo_buf,
 641                                                      cifs_sb->local_nls,
 642                                                      cifs_sb->mnt_cifs_flags &
 643                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 644                         else
 645                                 rc = -EOPNOTSUPP;
 646
 647                         if (rc == -EOPNOTSUPP) {
 648                                 int oplock = FALSE;
 649                                 __u16 netfid;
 650                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
 651                                                           full_path,
 652                                                           (__u16)ATTR_NORMAL,
 653                                                           cifs_sb->local_nls);
 654                            For some strange reason it seems that NT4 eats the
 655                            old setattr call without actually setting the
 656                            attributes so on to the third attempted workaround
 657                            */
 658
 659                         /* BB could scan to see if we already have it open
 660                            and pass in pid of opener to function */
 661                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 662                                                  FILE_OPEN, SYNCHRONIZE |
 663                                                  FILE_WRITE_ATTRIBUTES, 0,
 664                                                  &netfid, &oplock, NULL,
 665                                                  cifs_sb->local_nls,
 666                                                  cifs_sb->mnt_cifs_flags &
 667                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 668                                 if (rc==0) {
 669                                         rc = CIFSSMBSetFileTimes(xid, pTcon,
 670                                                                  pinfo_buf,
 671                                                                  netfid);
 672                                         CIFSSMBClose(xid, pTcon, netfid);
 673                                 }
 674                         }
 675                         kfree(pinfo_buf);
 676                 }
 677                 if (rc==0) {
 678                         rc = CIFSSMBDelFile(xid, pTcon, full_path,
 679                                             cifs_sb->local_nls,
 680                                             cifs_sb->mnt_cifs_flags &
 681                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 682                         if (!rc) {
 683                                 if (direntry->d_inode)
 684                                         drop_nlink(direntry->d_inode);
 685                         } else if (rc == -ETXTBSY) {
 686                                 int oplock = FALSE;
 687                                 __u16 netfid;
 688
 689                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 690                                                  FILE_OPEN, DELETE,
 691                                                  CREATE_NOT_DIR |
 692                                                  CREATE_DELETE_ON_CLOSE,
 693                                                  &netfid, &oplock, NULL,
 694                                                  cifs_sb->local_nls,
 695                                                  cifs_sb->mnt_cifs_flags &
 696                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 697                                 if (rc==0) {
 698                                         CIFSSMBRenameOpenFile(xid, pTcon,
 699                                                 netfid, NULL,
 700                                                 cifs_sb->local_nls,
 701                                                 cifs_sb->mnt_cifs_flags &
 702                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 703                                         CIFSSMBClose(xid, pTcon, netfid);
 704                                         if (direntry->d_inode)
 705                                                 drop_nlink(direntry->d_inode);
 706                                 }
 707                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
 708                         }
 709                 }
 710         }
 711         if (direntry->d_inode) {
 712                 cifsInode = CIFS_I(direntry->d_inode);
 713                 cifsInode->time = 0;    /* will force revalidate to get info
 714                                            when needed */
 715                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
 716         }
 717         if(inode) {
 718                 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
 719                 cifsInode = CIFS_I(inode);
 720                 cifsInode->time = 0;    /* force revalidate of dir as well */
 721         }
 722
 723         kfree(full_path);
 724         FreeXid(xid);
 725         return rc;
 726 }
 727
 728 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 729 {
 730         int rc = 0;
 731         int xid;
 732         struct cifs_sb_info *cifs_sb;
 733         struct cifsTconInfo *pTcon;
 734         char *full_path = NULL;
 735         struct inode *newinode = NULL;
 736
 737         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 738
 739         xid = GetXid();
 740
 741         cifs_sb = CIFS_SB(inode->i_sb);
 742         pTcon = cifs_sb->tcon;
 743
 744         full_path = build_path_from_dentry(direntry);
 745         if (full_path == NULL) {
 746                 FreeXid(xid);
 747                 return -ENOMEM;
 748         }
 749         /* BB add setting the equivalent of mode via CreateX w/ACLs */
 750         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
 751                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 752         if (rc) {
 753                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
 754                 d_drop(direntry);
 755         } else {
 756                 inc_nlink(inode);
 757                 if (pTcon->ses->capabilities & CAP_UNIX)
 758                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 759                                                       inode->i_sb,xid);
 760                 else
 761                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 762                                                  inode->i_sb,xid);
 763
 764                 if (pTcon->nocase)
 765                         direntry->d_op = &cifs_ci_dentry_ops;
 766                 else
 767                         direntry->d_op = &cifs_dentry_ops;
 768                 d_instantiate(direntry, newinode);
 769                 if (direntry->d_inode)
 770                         direntry->d_inode->i_nlink = 2;
 771                 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
 772                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 773                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 774                                                     mode,
 775                                                     (__u64)current->fsuid,
 776                                                     (__u64)current->fsgid,
 777                                                     0 /* dev_t */,
 778                                                     cifs_sb->local_nls,
 779                                                     cifs_sb->mnt_cifs_flags &
 780                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 781                         } else {
 782                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 783                                                     mode, (__u64)-1,
 784                                                     (__u64)-1, 0 /* dev_t */,
 785                                                     cifs_sb->local_nls,
 786                                                     cifs_sb->mnt_cifs_flags &
 787                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 788                         }
 789                 else {
 790                         /* BB to be implemented via Windows secrty descriptors
 791                            eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
 792                                                  -1, -1, local_nls); */
 793                         if(direntry->d_inode) {
 794                                 direntry->d_inode->i_mode = mode;
 795                                 direntry->d_inode->i_mode |= S_IFDIR;
 796                                 if(cifs_sb->mnt_cifs_flags &
 797                                      CIFS_MOUNT_SET_UID) {
 798                                         direntry->d_inode->i_uid =
 799                                                 current->fsuid;
 800                                         direntry->d_inode->i_gid =
 801                                                 current->fsgid;
 802                                 }
 803                         }
 804                 }
 805         }
 806         kfree(full_path);
 807         FreeXid(xid);
 808         return rc;
 809 }
 810
 811 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 812 {
 813         int rc = 0;
 814         int xid;
 815         struct cifs_sb_info *cifs_sb;
 816         struct cifsTconInfo *pTcon;
 817         char *full_path = NULL;
 818         struct cifsInodeInfo *cifsInode;
 819
 820         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
 821
 822         xid = GetXid();
 823
 824         cifs_sb = CIFS_SB(inode->i_sb);
 825         pTcon = cifs_sb->tcon;
 826
 827         full_path = build_path_from_dentry(direntry);
 828         if (full_path == NULL) {
 829                 FreeXid(xid);
 830                 return -ENOMEM;
 831         }
 832
 833         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
 834                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 835
 836         if (!rc) {
 837                 drop_nlink(inode);
 838                 i_size_write(direntry->d_inode,0);
 839                 clear_nlink(direntry->d_inode);
 840         }
 841
 842         cifsInode = CIFS_I(direntry->d_inode);
 843         cifsInode->time = 0;    /* force revalidate to go get info when
 844                                    needed */
 845         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
 846                 current_fs_time(inode->i_sb);
 847
 848         kfree(full_path);
 849         FreeXid(xid);
 850         return rc;
 851 }
 852
 853 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
 854         struct inode *target_inode, struct dentry *target_direntry)
 855 {
 856         char *fromName;
 857         char *toName;
 858         struct cifs_sb_info *cifs_sb_source;
 859         struct cifs_sb_info *cifs_sb_target;
 860         struct cifsTconInfo *pTcon;
 861         int xid;
 862         int rc = 0;
 863
 864         xid = GetXid();
 865
 866         cifs_sb_target = CIFS_SB(target_inode->i_sb);
 867         cifs_sb_source = CIFS_SB(source_inode->i_sb);
 868         pTcon = cifs_sb_source->tcon;
 869
 870         if (pTcon != cifs_sb_target->tcon) {
 871                 FreeXid(xid);
 872                 return -EXDEV;  /* BB actually could be allowed if same server,
 873                                    but different share.
 874                                    Might eventually add support for this */
 875         }
 876
 877         /* we already  have the rename sem so we do not need to grab it again
 878            here to protect the path integrity */
 879         fromName = build_path_from_dentry(source_direntry);
 880         toName = build_path_from_dentry(target_direntry);
 881         if ((fromName == NULL) || (toName == NULL)) {
 882                 rc = -ENOMEM;
 883                 goto cifs_rename_exit;
 884         }
 885
 886         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
 887                            cifs_sb_source->local_nls,
 888                            cifs_sb_source->mnt_cifs_flags &
 889                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 890         if (rc == -EEXIST) {
 891                 /* check if they are the same file because rename of hardlinked
 892                    files is a noop */
 893                 FILE_UNIX_BASIC_INFO *info_buf_source;
 894                 FILE_UNIX_BASIC_INFO *info_buf_target;
 895
 896                 info_buf_source =
 897                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 898                 if (info_buf_source != NULL) {
 899                         info_buf_target = info_buf_source + 1;
 900                         if (pTcon->ses->capabilities & CAP_UNIX)
 901                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
 902                                         info_buf_source,
 903                                         cifs_sb_source->local_nls,
 904                                         cifs_sb_source->mnt_cifs_flags &
 905                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 906                         /* else rc is still EEXIST so will fall through to
 907                            unlink the target and retry rename */
 908                         if (rc == 0) {
 909                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
 910                                                 info_buf_target,
 911                                                 cifs_sb_target->local_nls,
 912                                                 /* remap based on source sb */
 913                                                 cifs_sb_source->mnt_cifs_flags &
 914                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 915                         }
 916                         if ((rc == 0) &&
 917                             (info_buf_source->UniqueId ==
 918                              info_buf_target->UniqueId)) {
 919                         /* do not rename since the files are hardlinked which
 920                            is a noop */
 921                         } else {
 922                         /* we either can not tell the files are hardlinked
 923                            (as with Windows servers) or files are not
 924                            hardlinked so delete the target manually before
 925                            renaming to follow POSIX rather than Windows
 926                            semantics */
 927                                 cifs_unlink(target_inode, target_direntry);
 928                                 rc = CIFSSMBRename(xid, pTcon, fromName,
 929                                                    toName,
 930                                                    cifs_sb_source->local_nls,
 931                                                    cifs_sb_source->mnt_cifs_flags
 932                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
 933                         }
 934                         kfree(info_buf_source);
 935                 } /* if we can not get memory just leave rc as EEXIST */
 936         }
 937
 938         if (rc) {
 939                 cFYI(1, ("rename rc %d", rc));
 940         }
 941
 942         if ((rc == -EIO) || (rc == -EEXIST)) {
 943                 int oplock = FALSE;
 944                 __u16 netfid;
 945
 946                 /* BB FIXME Is Generic Read correct for rename? */
 947                 /* if renaming directory - we should not say CREATE_NOT_DIR,
 948                    need to test renaming open directory, also GENERIC_READ
 949                    might not right be right access to request */
 950                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
 951                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
 952                                  cifs_sb_source->local_nls,
 953                                  cifs_sb_source->mnt_cifs_flags &
 954                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 955                 if (rc==0) {
 956                         rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
 957                                               cifs_sb_source->local_nls,
 958                                               cifs_sb_source->mnt_cifs_flags &
 959                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 960                         CIFSSMBClose(xid, pTcon, netfid);
 961                 }
 962         }
 963
 964 cifs_rename_exit:
 965         kfree(fromName);
 966         kfree(toName);
 967         FreeXid(xid);
 968         return rc;
 969 }
 970
 971 int cifs_revalidate(struct dentry *direntry)
 972 {
 973         int xid;
 974         int rc = 0;
 975         char *full_path;
 976         struct cifs_sb_info *cifs_sb;
 977         struct cifsInodeInfo *cifsInode;
 978         loff_t local_size;
 979         struct timespec local_mtime;
 980         int invalidate_inode = FALSE;
 981
 982         if (direntry->d_inode == NULL)
 983                 return -ENOENT;
 984
 985         cifsInode = CIFS_I(direntry->d_inode);
 986
 987         if (cifsInode == NULL)
 988                 return -ENOENT;
 989
 990         /* no sense revalidating inode info on file that no one can write */
 991         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
 992                 return rc;
 993
 994         xid = GetXid();
 995
 996         cifs_sb = CIFS_SB(direntry->d_sb);
 997
 998         /* can not safely grab the rename sem here if rename calls revalidate
 999            since that would deadlock */
1000         full_path = build_path_from_dentry(direntry);
1001         if (full_path == NULL) {
1002                 FreeXid(xid);
1003                 return -ENOMEM;
1004         }
1005         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1006                  "jiffies %ld", full_path, direntry->d_inode,
1007                  direntry->d_inode->i_count.counter, direntry,
1008                  direntry->d_time, jiffies));
1009
1010         if (cifsInode->time == 0) {
1011                 /* was set to zero previously to force revalidate */
1012         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1013                    lookupCacheEnabled) {
1014                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1015                     (direntry->d_inode->i_nlink == 1)) {
1016                         kfree(full_path);
1017                         FreeXid(xid);
1018                         return rc;
1019                 } else {
1020                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1021                 }
1022         }
1023
1024         /* save mtime and size */
1025         local_mtime = direntry->d_inode->i_mtime;
1026         local_size = direntry->d_inode->i_size;
1027
1028         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
1029                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1030                                               direntry->d_sb,xid);
1031                 if (rc) {
1032                         cFYI(1, ("error on getting revalidate info %d", rc));
1033 /*                      if (rc != -ENOENT)
1034                                 rc = 0; */      /* BB should we cache info on
1035                                                    certain errors? */
1036                 }
1037         } else {
1038                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1039                                          direntry->d_sb,xid);
1040                 if (rc) {
1041                         cFYI(1, ("error on getting revalidate info %d", rc));
1042 /*                      if (rc != -ENOENT)
1043                                 rc = 0; */      /* BB should we cache info on
1044                                                    certain errors? */
1045                 }
1046         }
1047         /* should we remap certain errors, access denied?, to zero */
1048
1049         /* if not oplocked, we invalidate inode pages if mtime or file size
1050            had changed on server */
1051
1052         if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) &&
1053             (local_size == direntry->d_inode->i_size)) {
1054                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1055         } else {
1056                 /* file may have changed on server */
1057                 if (cifsInode->clientCanCacheRead) {
1058                         /* no need to invalidate inode pages since we were the
1059                            only ones who could have modified the file and the
1060                            server copy is staler than ours */
1061                 } else {
1062                         invalidate_inode = TRUE;
1063                 }
1064         }
1065
1066         /* can not grab this sem since kernel filesys locking documentation
1067            indicates i_mutex may be taken by the kernel on lookup and rename
1068            which could deadlock if we grab the i_mutex here as well */
1069 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1070         /* need to write out dirty pages here  */
1071         if (direntry->d_inode->i_mapping) {
1072                 /* do we need to lock inode until after invalidate completes
1073                    below? */
1074                 filemap_fdatawrite(direntry->d_inode->i_mapping);
1075         }
1076         if (invalidate_inode) {
1077         /* shrink_dcache not necessary now that cifs dentry ops
1078         are exported for negative dentries */
1079 /*              if(S_ISDIR(direntry->d_inode->i_mode))
1080                         shrink_dcache_parent(direntry); */
1081                 if (S_ISREG(direntry->d_inode->i_mode)) {
1082                         if (direntry->d_inode->i_mapping)
1083                                 filemap_fdatawait(direntry->d_inode->i_mapping);
1084                         /* may eventually have to do this for open files too */
1085                         if (list_empty(&(cifsInode->openFileList))) {
1086                                 /* changed on server - flush read ahead pages */
1087                                 cFYI(1, ("Invalidating read ahead data on "
1088                                          "closed file"));
1089                                 invalidate_remote_inode(direntry->d_inode);
1090                         }
1091                 }
1092         }
1093 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1094
1095         kfree(full_path);
1096         FreeXid(xid);
1097         return rc;
1098 }
1099
1100 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1101         struct kstat *stat)
1102 {
1103         int err = cifs_revalidate(dentry);
1104         if (!err) {
1105                 generic_fillattr(dentry->d_inode, stat);
1106                 stat->blksize = CIFS_MAX_MSGSIZE;
1107         }
1108         return err;
1109 }
1110
1111 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1112 {
1113         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1114         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1115         struct page *page;
1116         char *kaddr;
1117         int rc = 0;
1118
1119         page = grab_cache_page(mapping, index);
1120         if (!page)
1121                 return -ENOMEM;
1122
1123         kaddr = kmap_atomic(page, KM_USER0);
1124         memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1125         flush_dcache_page(page);
1126         kunmap_atomic(kaddr, KM_USER0);
1127         unlock_page(page);
1128         page_cache_release(page);
1129         return rc;
1130 }
1131
1132 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1133 {
1134         int xid;
1135         struct cifs_sb_info *cifs_sb;
1136         struct cifsTconInfo *pTcon;
1137         char *full_path = NULL;
1138         int rc = -EACCES;
1139         struct cifsFileInfo *open_file = NULL;
1140         FILE_BASIC_INFO time_buf;
1141         int set_time = FALSE;
1142         int set_dosattr = FALSE;
1143         __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1144         __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1145         __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1146         struct cifsInodeInfo *cifsInode;
1147
1148         xid = GetXid();
1149
1150         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1151                  direntry->d_name.name, attrs->ia_valid));
1152
1153         cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1154         pTcon = cifs_sb->tcon;
1155
1156         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1157                 /* check if we have permission to change attrs */
1158                 rc = inode_change_ok(direntry->d_inode, attrs);
1159                 if(rc < 0) {
1160                         FreeXid(xid);
1161                         return rc;
1162                 } else
1163                         rc = 0;
1164         }
1165
1166         full_path = build_path_from_dentry(direntry);
1167         if (full_path == NULL) {
1168                 FreeXid(xid);
1169                 return -ENOMEM;
1170         }
1171         cifsInode = CIFS_I(direntry->d_inode);
1172
1173         /* BB check if we need to refresh inode from server now ? BB */
1174
1175         /* need to flush data before changing file size on server */
1176         filemap_write_and_wait(direntry->d_inode->i_mapping);
1177
1178         if (attrs->ia_valid & ATTR_SIZE) {
1179                 /* To avoid spurious oplock breaks from server, in the case of
1180                    inodes that we already have open, avoid doing path based
1181                    setting of file size if we can do it by handle.
1182                    This keeps our caching token (oplock) and avoids timeouts
1183                    when the local oplock break takes longer to flush
1184                    writebehind data than the SMB timeout for the SetPathInfo
1185                    request would allow */
1186
1187                 open_file = find_writable_file(cifsInode);
1188                 if (open_file) {
1189                         __u16 nfid = open_file->netfid;
1190                         __u32 npid = open_file->pid;
1191                         rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1192                                                 nfid, npid, FALSE);
1193                         atomic_dec(&open_file->wrtPending);
1194                         cFYI(1,("SetFSize for attrs rc = %d", rc));
1195                         if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1196                                 int bytes_written;
1197                                 rc = CIFSSMBWrite(xid, pTcon,
1198                                                   nfid, 0, attrs->ia_size,
1199                                                   &bytes_written, NULL, NULL,
1200                                                   1 /* 45 seconds */);
1201                                 cFYI(1,("Wrt seteof rc %d", rc));
1202                         }
1203                 } else
1204                         rc = -EINVAL;
1205
1206                 if (rc != 0) {
1207                         /* Set file size by pathname rather than by handle
1208                            either because no valid, writeable file handle for
1209                            it was found or because there was an error setting
1210                            it by handle */
1211                         rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1212                                            attrs->ia_size, FALSE,
1213                                            cifs_sb->local_nls,
1214                                            cifs_sb->mnt_cifs_flags &
1215                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1216                         cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1217                         if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1218                                 __u16 netfid;
1219                                 int oplock = FALSE;
1220
1221                                 rc = SMBLegacyOpen(xid, pTcon, full_path,
1222                                         FILE_OPEN,
1223                                         SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1224                                         CREATE_NOT_DIR, &netfid, &oplock,
1225                                         NULL, cifs_sb->local_nls,
1226                                         cifs_sb->mnt_cifs_flags &
1227                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1228                                 if (rc==0) {
1229                                         int bytes_written;
1230                                         rc = CIFSSMBWrite(xid, pTcon,
1231                                                         netfid, 0,
1232                                                         attrs->ia_size,
1233                                                         &bytes_written, NULL,
1234                                                         NULL, 1 /* 45 sec */);
1235                                         cFYI(1,("wrt seteof rc %d",rc));
1236                                         CIFSSMBClose(xid, pTcon, netfid);
1237                                 }
1238
1239                         }
1240                 }
1241
1242                 /* Server is ok setting allocation size implicitly - no need
1243                    to call:
1244                 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1245                          cifs_sb->local_nls);
1246                    */
1247
1248                 if (rc == 0) {
1249                         rc = vmtruncate(direntry->d_inode, attrs->ia_size);
1250                         cifs_truncate_page(direntry->d_inode->i_mapping,
1251                                            direntry->d_inode->i_size);
1252                 } else
1253                         goto cifs_setattr_exit;
1254         }
1255         if (attrs->ia_valid & ATTR_UID) {
1256                 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1257                 uid = attrs->ia_uid;
1258         }
1259         if (attrs->ia_valid & ATTR_GID) {
1260                 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1261                 gid = attrs->ia_gid;
1262         }
1263
1264         time_buf.Attributes = 0;
1265         if (attrs->ia_valid & ATTR_MODE) {
1266                 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1267                 mode = attrs->ia_mode;
1268         }
1269
1270         if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1271             && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1272                 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1273                                          0 /* dev_t */, cifs_sb->local_nls,
1274                                          cifs_sb->mnt_cifs_flags &
1275                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1276         else if (attrs->ia_valid & ATTR_MODE) {
1277                 rc = 0;
1278                 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1279                         if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1280                                 set_dosattr = TRUE;
1281                                 time_buf.Attributes =
1282                                         cpu_to_le32(cifsInode->cifsAttrs |
1283                                                     ATTR_READONLY);
1284                         }
1285                 } else if ((mode & S_IWUGO) == S_IWUGO) {
1286                         if (cifsInode->cifsAttrs & ATTR_READONLY) {
1287                                 set_dosattr = TRUE;
1288                                 time_buf.Attributes =
1289                                         cpu_to_le32(cifsInode->cifsAttrs &
1290                                                     (~ATTR_READONLY));
1291                                 /* Windows ignores set to zero */
1292                                 if(time_buf.Attributes == 0)
1293                                         time_buf.Attributes |=
1294                                                 cpu_to_le32(ATTR_NORMAL);
1295                         }
1296                 }
1297                 /* BB to be implemented -
1298                    via Windows security descriptors or streams */
1299                 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1300                                       cifs_sb->local_nls); */
1301         }
1302
1303         if (attrs->ia_valid & ATTR_ATIME) {
1304                 set_time = TRUE;
1305                 time_buf.LastAccessTime =
1306                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1307         } else
1308                 time_buf.LastAccessTime = 0;
1309
1310         if (attrs->ia_valid & ATTR_MTIME) {
1311                 set_time = TRUE;
1312                 time_buf.LastWriteTime =
1313                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1314         } else
1315                 time_buf.LastWriteTime = 0;
1316         /* Do not set ctime explicitly unless other time
1317            stamps are changed explicitly (i.e. by utime()
1318            since we would then have a mix of client and
1319            server times */
1320
1321         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1322                 set_time = TRUE;
1323                 /* Although Samba throws this field away
1324                 it may be useful to Windows - but we do
1325                 not want to set ctime unless some other
1326                 timestamp is changing */
1327                 cFYI(1, ("CIFS - CTIME changed"));
1328                 time_buf.ChangeTime =
1329                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1330         } else
1331                 time_buf.ChangeTime = 0;
1332
1333         if (set_time || set_dosattr) {
1334                 time_buf.CreationTime = 0;      /* do not change */
1335                 /* In the future we should experiment - try setting timestamps
1336                    via Handle (SetFileInfo) instead of by path */
1337                 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1338                         rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1339                                              cifs_sb->local_nls,
1340                                              cifs_sb->mnt_cifs_flags &
1341                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1342                 else
1343                         rc = -EOPNOTSUPP;
1344
1345                 if (rc == -EOPNOTSUPP) {
1346                         int oplock = FALSE;
1347                         __u16 netfid;
1348
1349                         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1350                                  "times not supported by this server"));
1351                         /* BB we could scan to see if we already have it open
1352                            and pass in pid of opener to function */
1353                         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1354                                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1355                                          CREATE_NOT_DIR, &netfid, &oplock,
1356                                          NULL, cifs_sb->local_nls,
1357                                          cifs_sb->mnt_cifs_flags &
1358                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1359                         if (rc==0) {
1360                                 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1361                                                          netfid);
1362                                 CIFSSMBClose(xid, pTcon, netfid);
1363                         } else {
1364                         /* BB For even older servers we could convert time_buf
1365                            into old DOS style which uses two second
1366                            granularity */
1367
1368                         /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1369                                         &time_buf, cifs_sb->local_nls); */
1370                         }
1371                 }
1372                 /* Even if error on time set, no sense failing the call if
1373                 the server would set the time to a reasonable value anyway,
1374                 and this check ensures that we are not being called from
1375                 sys_utimes in which case we ought to fail the call back to
1376                 the user when the server rejects the call */
1377                 if((rc) && (attrs->ia_valid &&
1378                          (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1379                         rc = 0;
1380         }
1381
1382         /* do not need local check to inode_check_ok since the server does
1383            that */
1384         if (!rc)
1385                 rc = inode_setattr(direntry->d_inode, attrs);
1386 cifs_setattr_exit:
1387         kfree(full_path);
1388         FreeXid(xid);
1389         return rc;
1390 }
1391
1392 void cifs_delete_inode(struct inode *inode)
1393 {
1394         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1395         /* may have to add back in if and when safe distributed caching of
1396            directories added e.g. via FindNotify */
1397 }