git.oblomov.eu Git - linux-2.6/blob - 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/buffer_head.h>
  23 #include <linux/stat.h>
  24 #include <linux/pagemap.h>
  25 #include <asm/div64.h>
  26 #include "cifsfs.h"
  27 #include "cifspdu.h"
  28 #include "cifsglob.h"
  29 #include "cifsproto.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_fs_sb.h"
  32
  33 int cifs_get_inode_info_unix(struct inode **pinode,
  34         const unsigned char *search_path, struct super_block *sb, int xid)
  35 {
  36         int rc = 0;
  37         FILE_UNIX_BASIC_INFO findData;
  38         struct cifsTconInfo *pTcon;
  39         struct inode *inode;
  40         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
  41         char *tmp_path;
  42
  43         pTcon = cifs_sb->tcon;
  44         cFYI(1, ("Getting info on %s", search_path));
  45         /* could have done a find first instead but this returns more info */
  46         rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
  47                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
  48                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
  49 /*      dump_mem("\nUnixQPathInfo return data", &findData,
  50                  sizeof(findData)); */
  51         if (rc) {
  52                 if (rc == -EREMOTE) {
  53                         tmp_path =
  54                             kmalloc(strnlen(pTcon->treeName,
  55                                             MAX_TREE_SIZE + 1) +
  56                                     strnlen(search_path, MAX_PATHCONF) + 1,
  57                                     GFP_KERNEL);
  58                         if (tmp_path == NULL) {
  59                                 return -ENOMEM;
  60                         }
  61                         /* have to skip first of the double backslash of
  62                            UNC name */
  63                         strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
  64                         strncat(tmp_path, search_path, MAX_PATHCONF);
  65                         rc = connect_to_dfs_path(xid, pTcon->ses,
  66                                                  /* treename + */ tmp_path,
  67                                                  cifs_sb->local_nls,
  68                                                  cifs_sb->mnt_cifs_flags &
  69                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
  70                         kfree(tmp_path);
  71
  72                         /* BB fix up inode etc. */
  73                 } else if (rc) {
  74                         return rc;
  75                 }
  76         } else {
  77                 struct cifsInodeInfo *cifsInfo;
  78                 __u32 type = le32_to_cpu(findData.Type);
  79                 __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
  80                 __u64 end_of_file = le64_to_cpu(findData.EndOfFile);
  81
  82                 /* get new inode */
  83                 if (*pinode == NULL) {
  84                         *pinode = new_inode(sb);
  85                         if (*pinode == NULL)
  86                                 return -ENOMEM;
  87                         /* Is an i_ino of zero legal? */
  88                         /* Are there sanity checks we can use to ensure that
  89                            the server is really filling in that field? */
  90                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
  91                                 (*pinode)->i_ino =
  92                                         (unsigned long)findData.UniqueId;
  93                         } /* note ino incremented to unique num in new_inode */
  94                         insert_inode_hash(*pinode);
  95                 }
  96
  97                 inode = *pinode;
  98                 cifsInfo = CIFS_I(inode);
  99
 100                 cFYI(1, ("Old time %ld", cifsInfo->time));
 101                 cifsInfo->time = jiffies;
 102                 cFYI(1, ("New time %ld", cifsInfo->time));
 103                 /* this is ok to set on every inode revalidate */
 104                 atomic_set(&cifsInfo->inUse,1);
 105
 106                 inode->i_atime =
 107                     cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime));
 108                 inode->i_mtime =
 109                     cifs_NTtimeToUnix(le64_to_cpu
 110                                 (findData.LastModificationTime));
 111                 inode->i_ctime =
 112                     cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange));
 113                 inode->i_mode = le64_to_cpu(findData.Permissions);
 114                 /* since we set the inode type below we need to mask off
 115                    to avoid strange results if bits set above */
 116                         inode->i_mode &= ~S_IFMT;
 117                 if (type == UNIX_FILE) {
 118                         inode->i_mode |= S_IFREG;
 119                 } else if (type == UNIX_SYMLINK) {
 120                         inode->i_mode |= S_IFLNK;
 121                 } else if (type == UNIX_DIR) {
 122                         inode->i_mode |= S_IFDIR;
 123                 } else if (type == UNIX_CHARDEV) {
 124                         inode->i_mode |= S_IFCHR;
 125                         inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
 126                                 le64_to_cpu(findData.DevMinor) & MINORMASK);
 127                 } else if (type == UNIX_BLOCKDEV) {
 128                         inode->i_mode |= S_IFBLK;
 129                         inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
 130                                 le64_to_cpu(findData.DevMinor) & MINORMASK);
 131                 } else if (type == UNIX_FIFO) {
 132                         inode->i_mode |= S_IFIFO;
 133                 } else if (type == UNIX_SOCKET) {
 134                         inode->i_mode |= S_IFSOCK;
 135                 } else {
 136                         /* safest to call it a file if we do not know */
 137                         inode->i_mode |= S_IFREG;
 138                         cFYI(1,("unknown type %d",type));
 139                 }
 140                 inode->i_uid = le64_to_cpu(findData.Uid);
 141                 inode->i_gid = le64_to_cpu(findData.Gid);
 142                 inode->i_nlink = le64_to_cpu(findData.Nlinks);
 143
 144                 if (is_size_safe_to_change(cifsInfo)) {
 145                 /* can not safely change the file size here if the
 146                    client is writing to it due to potential races */
 147
 148                         i_size_write(inode, end_of_file);
 149
 150                 /* blksize needs to be multiple of two. So safer to default to
 151                 blksize and blkbits set in superblock so 2**blkbits and blksize
 152                 will match rather than setting to:
 153                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 154
 155                 /* This seems incredibly stupid but it turns out that i_blocks
 156                    is not related to (i_size / i_blksize), instead 512 byte size
 157                    is required for calculating num blocks */
 158
 159                 /* 512 bytes (2**9) is the fake blocksize that must be used */
 160                 /* for this calculation */
 161                         inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 162                 }
 163
 164                 if (num_of_bytes < end_of_file)
 165                         cFYI(1, ("allocation size less than end of file"));
 166                 cFYI(1, ("Size %ld and blocks %llu",
 167                         (unsigned long) inode->i_size,
 168                         (unsigned long long)inode->i_blocks));
 169                 if (S_ISREG(inode->i_mode)) {
 170                         cFYI(1, ("File inode"));
 171                         inode->i_op = &cifs_file_inode_ops;
 172                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 173                                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 174                                         inode->i_fop =
 175                                                 &cifs_file_direct_nobrl_ops;
 176                                 else
 177                                         inode->i_fop = &cifs_file_direct_ops;
 178                         } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 179                                 inode->i_fop = &cifs_file_nobrl_ops;
 180                         else /* not direct, send byte range locks */
 181                                 inode->i_fop = &cifs_file_ops;
 182
 183                         inode->i_data.a_ops = &cifs_addr_ops;
 184                         /* check if server can support readpages */
 185                         if(pTcon->ses->server->maxBuf <
 186                             4096 + MAX_CIFS_HDR_SIZE)
 187                                 inode->i_data.a_ops->readpages = NULL;
 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
 322         pTcon = cifs_sb->tcon;
 323         cFYI(1,("Getting info on %s", search_path));
 324
 325         if ((pfindData == NULL) && (*pinode != NULL)) {
 326                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 327                         cFYI(1,("No need to revalidate cached inode sizes"));
 328                         return rc;
 329                 }
 330         }
 331
 332         /* if file info not passed in then get it from server */
 333         if (pfindData == NULL) {
 334                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 335                 if (buf == NULL)
 336                         return -ENOMEM;
 337                 pfindData = (FILE_ALL_INFO *)buf;
 338                 /* could do find first instead but this returns more info */
 339                 rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
 340                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 341                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 342                 /* BB optimize code so we do not make the above call
 343                 when server claims no NT SMB support and the above call
 344                 failed at least once - set flag in tcon or mount */
 345                 if((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 346                         rc = SMBQueryInformation(xid, pTcon, search_path,
 347                                         pfindData, cifs_sb->local_nls,
 348                                         cifs_sb->mnt_cifs_flags &
 349                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 350                 }
 351
 352         }
 353         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
 354         if (rc) {
 355                 if (rc == -EREMOTE) {
 356                         tmp_path =
 357                             kmalloc(strnlen
 358                                     (pTcon->treeName,
 359                                      MAX_TREE_SIZE + 1) +
 360                                     strnlen(search_path, MAX_PATHCONF) + 1,
 361                                     GFP_KERNEL);
 362                         if (tmp_path == NULL) {
 363                                 kfree(buf);
 364                                 return -ENOMEM;
 365                         }
 366
 367                         strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
 368                         strncat(tmp_path, search_path, MAX_PATHCONF);
 369                         rc = connect_to_dfs_path(xid, pTcon->ses,
 370                                                  /* treename + */ tmp_path,
 371                                                  cifs_sb->local_nls,
 372                                                  cifs_sb->mnt_cifs_flags &
 373                                                    CIFS_MOUNT_MAP_SPECIAL_CHR);
 374                         kfree(tmp_path);
 375                         /* BB fix up inode etc. */
 376                 } else if (rc) {
 377                         kfree(buf);
 378                         return rc;
 379                 }
 380         } else {
 381                 struct cifsInodeInfo *cifsInfo;
 382                 __u32 attr = le32_to_cpu(pfindData->Attributes);
 383
 384                 /* get new inode */
 385                 if (*pinode == NULL) {
 386                         *pinode = new_inode(sb);
 387                         if (*pinode == NULL)
 388                                 return -ENOMEM;
 389                         /* Is an i_ino of zero legal? Can we use that to check
 390                            if the server supports returning inode numbers?  Are
 391                            there other sanity checks we can use to ensure that
 392                            the server is really filling in that field? */
 393
 394                         /* We can not use the IndexNumber field by default from
 395                            Windows or Samba (in ALL_INFO buf) but we can request
 396                            it explicitly.  It may not be unique presumably if
 397                            the server has multiple devices mounted under one
 398                            share */
 399
 400                         /* There may be higher info levels that work but are
 401                            there Windows server or network appliances for which
 402                            IndexNumber field is not guaranteed unique? */
 403
 404                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM){
 405                                 int rc1 = 0;
 406                                 __u64 inode_num;
 407
 408                                 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 409                                         search_path, &inode_num,
 410                                         cifs_sb->local_nls,
 411                                         cifs_sb->mnt_cifs_flags &
 412                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 413                                 if (rc1) {
 414                                         cFYI(1,("GetSrvInodeNum rc %d", rc1));
 415                                         /* BB EOPNOSUPP disable SERVER_INUM? */
 416                                 } else /* do we need cast or hash to ino? */
 417                                         (*pinode)->i_ino = inode_num;
 418                         } /* else ino incremented to unique num in new_inode*/
 419                         insert_inode_hash(*pinode);
 420                 }
 421                 inode = *pinode;
 422                 cifsInfo = CIFS_I(inode);
 423                 cifsInfo->cifsAttrs = attr;
 424                 cFYI(1, ("Old time %ld", cifsInfo->time));
 425                 cifsInfo->time = jiffies;
 426                 cFYI(1, ("New time %ld", cifsInfo->time));
 427
 428                 /* blksize needs to be multiple of two. So safer to default to
 429                 blksize and blkbits set in superblock so 2**blkbits and blksize
 430                 will match rather than setting to:
 431                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 432
 433                 /* Linux can not store file creation time so ignore it */
 434                 inode->i_atime =
 435                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 436                 inode->i_mtime =
 437                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 438                 inode->i_ctime =
 439                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 440                 cFYI(0, ("Attributes came in as 0x%x", attr));
 441
 442                 /* set default mode. will override for dirs below */
 443                 if (atomic_read(&cifsInfo->inUse) == 0)
 444                         /* new inode, can safely set these fields */
 445                         inode->i_mode = cifs_sb->mnt_file_mode;
 446                 else /* since we set the inode type below we need to mask off
 447                      to avoid strange results if type changes and both get orred in */
 448                         inode->i_mode &= ~S_IFMT;
 449 /*              if (attr & ATTR_REPARSE)  */
 450                 /* We no longer handle these as symlinks because we could not
 451                    follow them due to the absolute path with drive letter */
 452                 if (attr & ATTR_DIRECTORY) {
 453                 /* override default perms since we do not do byte range locking
 454                    on dirs */
 455                         inode->i_mode = cifs_sb->mnt_dir_mode;
 456                         inode->i_mode |= S_IFDIR;
 457                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 458                            (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
 459                            /* No need to le64 convert size of zero */
 460                            (pfindData->EndOfFile == 0)) {
 461                         inode->i_mode = cifs_sb->mnt_file_mode;
 462                         inode->i_mode |= S_IFIFO;
 463 /* BB Finish for SFU style symlinks and devices */
 464                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 465                            (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
 466                         if (decode_sfu_inode(inode,
 467                                          le64_to_cpu(pfindData->EndOfFile),
 468                                          search_path,
 469                                          cifs_sb, xid)) {
 470                                 cFYI(1,("Unrecognized sfu inode type"));
 471                         }
 472                         cFYI(1,("sfu mode 0%o",inode->i_mode));
 473                 } else {
 474                         inode->i_mode |= S_IFREG;
 475                         /* treat the dos attribute of read-only as read-only
 476                            mode e.g. 555 */
 477                         if (cifsInfo->cifsAttrs & ATTR_READONLY)
 478                                 inode->i_mode &= ~(S_IWUGO);
 479                 /* BB add code here -
 480                    validate if device or weird share or device type? */
 481                 }
 482                 if (is_size_safe_to_change(cifsInfo)) {
 483                         /* can not safely change the file size here if the
 484                            client is writing to it due to potential races */
 485                         i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));
 486
 487                         /* 512 bytes (2**9) is the fake blocksize that must be
 488                            used for this calculation */
 489                         inode->i_blocks = (512 - 1 + le64_to_cpu(
 490                                            pfindData->AllocationSize)) >> 9;
 491                 }
 492
 493                 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 494
 495                 /* BB fill in uid and gid here? with help from winbind?
 496                    or retrieve from NTFS stream extended attribute */
 497                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 498                         /* fill in uid, gid, mode from server ACL */
 499                         get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
 500                 } else if (atomic_read(&cifsInfo->inUse) == 0) {
 501                         inode->i_uid = cifs_sb->mnt_uid;
 502                         inode->i_gid = cifs_sb->mnt_gid;
 503                         /* set so we do not keep refreshing these fields with
 504                            bad data after user has changed them in memory */
 505                         atomic_set(&cifsInfo->inUse,1);
 506                 }
 507
 508                 if (S_ISREG(inode->i_mode)) {
 509                         cFYI(1, ("File inode"));
 510                         inode->i_op = &cifs_file_inode_ops;
 511                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 512                                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 513                                         inode->i_fop =
 514                                                 &cifs_file_direct_nobrl_ops;
 515                                 else
 516                                         inode->i_fop = &cifs_file_direct_ops;
 517                         } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 518                                 inode->i_fop = &cifs_file_nobrl_ops;
 519                         else /* not direct, send byte range locks */
 520                                 inode->i_fop = &cifs_file_ops;
 521
 522                         inode->i_data.a_ops = &cifs_addr_ops;
 523                         if(pTcon->ses->server->maxBuf <
 524                              4096 + MAX_CIFS_HDR_SIZE)
 525                                 inode->i_data.a_ops->readpages = NULL;
 526                 } else if (S_ISDIR(inode->i_mode)) {
 527                         cFYI(1, ("Directory inode"));
 528                         inode->i_op = &cifs_dir_inode_ops;
 529                         inode->i_fop = &cifs_dir_ops;
 530                 } else if (S_ISLNK(inode->i_mode)) {
 531                         cFYI(1, ("Symbolic Link inode"));
 532                         inode->i_op = &cifs_symlink_inode_ops;
 533                 } else {
 534                         init_special_inode(inode, inode->i_mode,
 535                                            inode->i_rdev);
 536                 }
 537         }
 538         kfree(buf);
 539         return rc;
 540 }
 541
 542 /* gets root inode */
 543 void cifs_read_inode(struct inode *inode)
 544 {
 545         int xid;
 546         struct cifs_sb_info *cifs_sb;
 547
 548         cifs_sb = CIFS_SB(inode->i_sb);
 549         xid = GetXid();
 550         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
 551                 cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
 552         else
 553                 cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
 554         /* can not call macro FreeXid here since in a void func */
 555         _FreeXid(xid);
 556 }
 557
 558 int cifs_unlink(struct inode *inode, struct dentry *direntry)
 559 {
 560         int rc = 0;
 561         int xid;
 562         struct cifs_sb_info *cifs_sb;
 563         struct cifsTconInfo *pTcon;
 564         char *full_path = NULL;
 565         struct cifsInodeInfo *cifsInode;
 566         FILE_BASIC_INFO *pinfo_buf;
 567
 568         cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
 569
 570         xid = GetXid();
 571
 572         if(inode)
 573                 cifs_sb = CIFS_SB(inode->i_sb);
 574         else
 575                 cifs_sb = CIFS_SB(direntry->d_sb);
 576         pTcon = cifs_sb->tcon;
 577
 578         /* Unlink can be called from rename so we can not grab the sem here
 579            since we deadlock otherwise */
 580 /*      mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
 581         full_path = build_path_from_dentry(direntry);
 582 /*      mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
 583         if (full_path == NULL) {
 584                 FreeXid(xid);
 585                 return -ENOMEM;
 586         }
 587         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
 588                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 589
 590         if (!rc) {
 591                 if (direntry->d_inode)
 592                         direntry->d_inode->i_nlink--;
 593         } else if (rc == -ENOENT) {
 594                 d_drop(direntry);
 595         } else if (rc == -ETXTBSY) {
 596                 int oplock = FALSE;
 597                 __u16 netfid;
 598
 599                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
 600                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
 601                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
 602                                  cifs_sb->mnt_cifs_flags &
 603                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 604                 if (rc==0) {
 605                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
 606                                               cifs_sb->local_nls,
 607                                               cifs_sb->mnt_cifs_flags &
 608                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 609                         CIFSSMBClose(xid, pTcon, netfid);
 610                         if (direntry->d_inode)
 611                                 direntry->d_inode->i_nlink--;
 612                 }
 613         } else if (rc == -EACCES) {
 614                 /* try only if r/o attribute set in local lookup data? */
 615                 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
 616                 if (pinfo_buf) {
 617                         /* ATTRS set to normal clears r/o bit */
 618                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
 619                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
 620                                 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
 621                                                      pinfo_buf,
 622                                                      cifs_sb->local_nls,
 623                                                      cifs_sb->mnt_cifs_flags &
 624                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 625                         else
 626                                 rc = -EOPNOTSUPP;
 627
 628                         if (rc == -EOPNOTSUPP) {
 629                                 int oplock = FALSE;
 630                                 __u16 netfid;
 631                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
 632                                                           full_path,
 633                                                           (__u16)ATTR_NORMAL,
 634                                                           cifs_sb->local_nls);
 635                            For some strange reason it seems that NT4 eats the
 636                            old setattr call without actually setting the
 637                            attributes so on to the third attempted workaround
 638                            */
 639
 640                         /* BB could scan to see if we already have it open
 641                            and pass in pid of opener to function */
 642                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 643                                                  FILE_OPEN, SYNCHRONIZE |
 644                                                  FILE_WRITE_ATTRIBUTES, 0,
 645                                                  &netfid, &oplock, NULL,
 646                                                  cifs_sb->local_nls,
 647                                                  cifs_sb->mnt_cifs_flags &
 648                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 649                                 if (rc==0) {
 650                                         rc = CIFSSMBSetFileTimes(xid, pTcon,
 651                                                                  pinfo_buf,
 652                                                                  netfid);
 653                                         CIFSSMBClose(xid, pTcon, netfid);
 654                                 }
 655                         }
 656                         kfree(pinfo_buf);
 657                 }
 658                 if (rc==0) {
 659                         rc = CIFSSMBDelFile(xid, pTcon, full_path,
 660                                             cifs_sb->local_nls,
 661                                             cifs_sb->mnt_cifs_flags &
 662                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 663                         if (!rc) {
 664                                 if (direntry->d_inode)
 665                                         direntry->d_inode->i_nlink--;
 666                         } else if (rc == -ETXTBSY) {
 667                                 int oplock = FALSE;
 668                                 __u16 netfid;
 669
 670                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 671                                                  FILE_OPEN, DELETE,
 672                                                  CREATE_NOT_DIR |
 673                                                  CREATE_DELETE_ON_CLOSE,
 674                                                  &netfid, &oplock, NULL,
 675                                                  cifs_sb->local_nls,
 676                                                  cifs_sb->mnt_cifs_flags &
 677                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 678                                 if (rc==0) {
 679                                         CIFSSMBRenameOpenFile(xid, pTcon,
 680                                                 netfid, NULL,
 681                                                 cifs_sb->local_nls,
 682                                                 cifs_sb->mnt_cifs_flags &
 683                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 684                                         CIFSSMBClose(xid, pTcon, netfid);
 685                                         if (direntry->d_inode)
 686                                                 direntry->d_inode->i_nlink--;
 687                                 }
 688                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
 689                         }
 690                 }
 691         }
 692         if (direntry->d_inode) {
 693                 cifsInode = CIFS_I(direntry->d_inode);
 694                 cifsInode->time = 0;    /* will force revalidate to get info
 695                                            when needed */
 696                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
 697         }
 698         if(inode) {
 699                 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
 700                 cifsInode = CIFS_I(inode);
 701                 cifsInode->time = 0;    /* force revalidate of dir as well */
 702         }
 703
 704         kfree(full_path);
 705         FreeXid(xid);
 706         return rc;
 707 }
 708
 709 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 710 {
 711         int rc = 0;
 712         int xid;
 713         struct cifs_sb_info *cifs_sb;
 714         struct cifsTconInfo *pTcon;
 715         char *full_path = NULL;
 716         struct inode *newinode = NULL;
 717
 718         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 719
 720         xid = GetXid();
 721
 722         cifs_sb = CIFS_SB(inode->i_sb);
 723         pTcon = cifs_sb->tcon;
 724
 725         full_path = build_path_from_dentry(direntry);
 726         if (full_path == NULL) {
 727                 FreeXid(xid);
 728                 return -ENOMEM;
 729         }
 730         /* BB add setting the equivalent of mode via CreateX w/ACLs */
 731         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
 732                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 733         if (rc) {
 734                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
 735                 d_drop(direntry);
 736         } else {
 737                 inode->i_nlink++;
 738                 if (pTcon->ses->capabilities & CAP_UNIX)
 739                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 740                                                       inode->i_sb,xid);
 741                 else
 742                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 743                                                  inode->i_sb,xid);
 744
 745                 if (pTcon->nocase)
 746                         direntry->d_op = &cifs_ci_dentry_ops;
 747                 else
 748                         direntry->d_op = &cifs_dentry_ops;
 749                 d_instantiate(direntry, newinode);
 750                 if (direntry->d_inode)
 751                         direntry->d_inode->i_nlink = 2;
 752                 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
 753                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 754                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 755                                                     mode,
 756                                                     (__u64)current->fsuid,
 757                                                     (__u64)current->fsgid,
 758                                                     0 /* dev_t */,
 759                                                     cifs_sb->local_nls,
 760                                                     cifs_sb->mnt_cifs_flags &
 761                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 762                         } else {
 763                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 764                                                     mode, (__u64)-1,
 765                                                     (__u64)-1, 0 /* dev_t */,
 766                                                     cifs_sb->local_nls,
 767                                                     cifs_sb->mnt_cifs_flags &
 768                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 769                         }
 770                 else {
 771                         /* BB to be implemented via Windows secrty descriptors
 772                            eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
 773                                                  -1, -1, local_nls); */
 774                         if(direntry->d_inode) {
 775                                 direntry->d_inode->i_mode = mode;
 776                                 direntry->d_inode->i_mode |= S_IFDIR;
 777                                 if(cifs_sb->mnt_cifs_flags &
 778                                      CIFS_MOUNT_SET_UID) {
 779                                         direntry->d_inode->i_uid =
 780                                                 current->fsuid;
 781                                         direntry->d_inode->i_gid =
 782                                                 current->fsgid;
 783                                 }
 784                         }
 785                 }
 786         }
 787         kfree(full_path);
 788         FreeXid(xid);
 789         return rc;
 790 }
 791
 792 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 793 {
 794         int rc = 0;
 795         int xid;
 796         struct cifs_sb_info *cifs_sb;
 797         struct cifsTconInfo *pTcon;
 798         char *full_path = NULL;
 799         struct cifsInodeInfo *cifsInode;
 800
 801         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
 802
 803         xid = GetXid();
 804
 805         cifs_sb = CIFS_SB(inode->i_sb);
 806         pTcon = cifs_sb->tcon;
 807
 808         full_path = build_path_from_dentry(direntry);
 809         if (full_path == NULL) {
 810                 FreeXid(xid);
 811                 return -ENOMEM;
 812         }
 813
 814         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
 815                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 816
 817         if (!rc) {
 818                 inode->i_nlink--;
 819                 i_size_write(direntry->d_inode,0);
 820                 direntry->d_inode->i_nlink = 0;
 821         }
 822
 823         cifsInode = CIFS_I(direntry->d_inode);
 824         cifsInode->time = 0;    /* force revalidate to go get info when
 825                                    needed */
 826         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
 827                 current_fs_time(inode->i_sb);
 828
 829         kfree(full_path);
 830         FreeXid(xid);
 831         return rc;
 832 }
 833
 834 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
 835         struct inode *target_inode, struct dentry *target_direntry)
 836 {
 837         char *fromName;
 838         char *toName;
 839         struct cifs_sb_info *cifs_sb_source;
 840         struct cifs_sb_info *cifs_sb_target;
 841         struct cifsTconInfo *pTcon;
 842         int xid;
 843         int rc = 0;
 844
 845         xid = GetXid();
 846
 847         cifs_sb_target = CIFS_SB(target_inode->i_sb);
 848         cifs_sb_source = CIFS_SB(source_inode->i_sb);
 849         pTcon = cifs_sb_source->tcon;
 850
 851         if (pTcon != cifs_sb_target->tcon) {
 852                 FreeXid(xid);
 853                 return -EXDEV;  /* BB actually could be allowed if same server,
 854                                    but different share.
 855                                    Might eventually add support for this */
 856         }
 857
 858         /* we already  have the rename sem so we do not need to grab it again
 859            here to protect the path integrity */
 860         fromName = build_path_from_dentry(source_direntry);
 861         toName = build_path_from_dentry(target_direntry);
 862         if ((fromName == NULL) || (toName == NULL)) {
 863                 rc = -ENOMEM;
 864                 goto cifs_rename_exit;
 865         }
 866
 867         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
 868                            cifs_sb_source->local_nls,
 869                            cifs_sb_source->mnt_cifs_flags &
 870                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 871         if (rc == -EEXIST) {
 872                 /* check if they are the same file because rename of hardlinked
 873                    files is a noop */
 874                 FILE_UNIX_BASIC_INFO *info_buf_source;
 875                 FILE_UNIX_BASIC_INFO *info_buf_target;
 876
 877                 info_buf_source =
 878                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 879                 if (info_buf_source != NULL) {
 880                         info_buf_target = info_buf_source + 1;
 881                         rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
 882                                 info_buf_source, cifs_sb_source->local_nls,
 883                                 cifs_sb_source->mnt_cifs_flags &
 884                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 885                         if (rc == 0) {
 886                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
 887                                                 info_buf_target,
 888                                                 cifs_sb_target->local_nls,
 889                                                 /* remap based on source sb */
 890                                                 cifs_sb_source->mnt_cifs_flags &
 891                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 892                         }
 893                         if ((rc == 0) &&
 894                             (info_buf_source->UniqueId ==
 895                              info_buf_target->UniqueId)) {
 896                         /* do not rename since the files are hardlinked which
 897                            is a noop */
 898                         } else {
 899                         /* we either can not tell the files are hardlinked
 900                            (as with Windows servers) or files are not
 901                            hardlinked so delete the target manually before
 902                            renaming to follow POSIX rather than Windows
 903                            semantics */
 904                                 cifs_unlink(target_inode, target_direntry);
 905                                 rc = CIFSSMBRename(xid, pTcon, fromName,
 906                                                    toName,
 907                                                    cifs_sb_source->local_nls,
 908                                                    cifs_sb_source->mnt_cifs_flags
 909                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
 910                         }
 911                         kfree(info_buf_source);
 912                 } /* if we can not get memory just leave rc as EEXIST */
 913         }
 914
 915         if (rc) {
 916                 cFYI(1, ("rename rc %d", rc));
 917         }
 918
 919         if ((rc == -EIO) || (rc == -EEXIST)) {
 920                 int oplock = FALSE;
 921                 __u16 netfid;
 922
 923                 /* BB FIXME Is Generic Read correct for rename? */
 924                 /* if renaming directory - we should not say CREATE_NOT_DIR,
 925                    need to test renaming open directory, also GENERIC_READ
 926                    might not right be right access to request */
 927                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
 928                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
 929                                  cifs_sb_source->local_nls,
 930                                  cifs_sb_source->mnt_cifs_flags &
 931                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 932                 if (rc==0) {
 933                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
 934                                               cifs_sb_source->local_nls,
 935                                               cifs_sb_source->mnt_cifs_flags &
 936                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 937                         CIFSSMBClose(xid, pTcon, netfid);
 938                 }
 939         }
 940
 941 cifs_rename_exit:
 942         kfree(fromName);
 943         kfree(toName);
 944         FreeXid(xid);
 945         return rc;
 946 }
 947
 948 int cifs_revalidate(struct dentry *direntry)
 949 {
 950         int xid;
 951         int rc = 0;
 952         char *full_path;
 953         struct cifs_sb_info *cifs_sb;
 954         struct cifsInodeInfo *cifsInode;
 955         loff_t local_size;
 956         struct timespec local_mtime;
 957         int invalidate_inode = FALSE;
 958
 959         if (direntry->d_inode == NULL)
 960                 return -ENOENT;
 961
 962         cifsInode = CIFS_I(direntry->d_inode);
 963
 964         if (cifsInode == NULL)
 965                 return -ENOENT;
 966
 967         /* no sense revalidating inode info on file that no one can write */
 968         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
 969                 return rc;
 970
 971         xid = GetXid();
 972
 973         cifs_sb = CIFS_SB(direntry->d_sb);
 974
 975         /* can not safely grab the rename sem here if rename calls revalidate
 976            since that would deadlock */
 977         full_path = build_path_from_dentry(direntry);
 978         if (full_path == NULL) {
 979                 FreeXid(xid);
 980                 return -ENOMEM;
 981         }
 982         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
 983                  "jiffies %ld", full_path, direntry->d_inode,
 984                  direntry->d_inode->i_count.counter, direntry,
 985                  direntry->d_time, jiffies));
 986
 987         if (cifsInode->time == 0) {
 988                 /* was set to zero previously to force revalidate */
 989         } else if (time_before(jiffies, cifsInode->time + HZ) &&
 990                    lookupCacheEnabled) {
 991                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
 992                     (direntry->d_inode->i_nlink == 1)) {
 993                         kfree(full_path);
 994                         FreeXid(xid);
 995                         return rc;
 996                 } else {
 997                         cFYI(1, ("Have to revalidate file due to hardlinks"));
 998                 }
 999         }
1000
1001         /* save mtime and size */
1002         local_mtime = direntry->d_inode->i_mtime;
1003         local_size = direntry->d_inode->i_size;
1004
1005         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
1006                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1007                                               direntry->d_sb,xid);
1008                 if (rc) {
1009                         cFYI(1, ("error on getting revalidate info %d", rc));
1010 /*                      if (rc != -ENOENT)
1011                                 rc = 0; */      /* BB should we cache info on
1012                                                    certain errors? */
1013                 }
1014         } else {
1015                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1016                                          direntry->d_sb,xid);
1017                 if (rc) {
1018                         cFYI(1, ("error on getting revalidate info %d", rc));
1019 /*                      if (rc != -ENOENT)
1020                                 rc = 0; */      /* BB should we cache info on
1021                                                    certain errors? */
1022                 }
1023         }
1024         /* should we remap certain errors, access denied?, to zero */
1025
1026         /* if not oplocked, we invalidate inode pages if mtime or file size
1027            had changed on server */
1028
1029         if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) &&
1030             (local_size == direntry->d_inode->i_size)) {
1031                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1032         } else {
1033                 /* file may have changed on server */
1034                 if (cifsInode->clientCanCacheRead) {
1035                         /* no need to invalidate inode pages since we were the
1036                            only ones who could have modified the file and the
1037                            server copy is staler than ours */
1038                 } else {
1039                         invalidate_inode = TRUE;
1040                 }
1041         }
1042
1043         /* can not grab this sem since kernel filesys locking documentation
1044            indicates i_mutex may be taken by the kernel on lookup and rename
1045            which could deadlock if we grab the i_mutex here as well */
1046 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1047         /* need to write out dirty pages here  */
1048         if (direntry->d_inode->i_mapping) {
1049                 /* do we need to lock inode until after invalidate completes
1050                    below? */
1051                 filemap_fdatawrite(direntry->d_inode->i_mapping);
1052         }
1053         if (invalidate_inode) {
1054         /* shrink_dcache not necessary now that cifs dentry ops
1055         are exported for negative dentries */
1056 /*              if(S_ISDIR(direntry->d_inode->i_mode))
1057                         shrink_dcache_parent(direntry); */
1058                 if (S_ISREG(direntry->d_inode->i_mode)) {
1059                         if (direntry->d_inode->i_mapping)
1060                                 filemap_fdatawait(direntry->d_inode->i_mapping);
1061                         /* may eventually have to do this for open files too */
1062                         if (list_empty(&(cifsInode->openFileList))) {
1063                                 /* changed on server - flush read ahead pages */
1064                                 cFYI(1, ("Invalidating read ahead data on "
1065                                          "closed file"));
1066                                 invalidate_remote_inode(direntry->d_inode);
1067                         }
1068                 }
1069         }
1070 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1071
1072         kfree(full_path);
1073         FreeXid(xid);
1074         return rc;
1075 }
1076
1077 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1078         struct kstat *stat)
1079 {
1080         int err = cifs_revalidate(dentry);
1081         if (!err)
1082                 generic_fillattr(dentry->d_inode, stat);
1083         return err;
1084 }
1085
1086 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1087 {
1088         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1089         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1090         struct page *page;
1091         char *kaddr;
1092         int rc = 0;
1093
1094         page = grab_cache_page(mapping, index);
1095         if (!page)
1096                 return -ENOMEM;
1097
1098         kaddr = kmap_atomic(page, KM_USER0);
1099         memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1100         flush_dcache_page(page);
1101         kunmap_atomic(kaddr, KM_USER0);
1102         unlock_page(page);
1103         page_cache_release(page);
1104         return rc;
1105 }
1106
1107 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1108 {
1109         int xid;
1110         struct cifs_sb_info *cifs_sb;
1111         struct cifsTconInfo *pTcon;
1112         char *full_path = NULL;
1113         int rc = -EACCES;
1114         struct cifsFileInfo *open_file = NULL;
1115         FILE_BASIC_INFO time_buf;
1116         int set_time = FALSE;
1117         __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1118         __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1119         __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1120         struct cifsInodeInfo *cifsInode;
1121
1122         xid = GetXid();
1123
1124         cFYI(1, ("In cifs_setattr, name = %s attrs->iavalid 0x%x",
1125                  direntry->d_name.name, attrs->ia_valid));
1126
1127         cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1128         pTcon = cifs_sb->tcon;
1129
1130         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1131                 /* check if we have permission to change attrs */
1132                 rc = inode_change_ok(direntry->d_inode, attrs);
1133                 if(rc < 0) {
1134                         FreeXid(xid);
1135                         return rc;
1136                 } else
1137                         rc = 0;
1138         }
1139
1140         full_path = build_path_from_dentry(direntry);
1141         if (full_path == NULL) {
1142                 FreeXid(xid);
1143                 return -ENOMEM;
1144         }
1145         cifsInode = CIFS_I(direntry->d_inode);
1146
1147         /* BB check if we need to refresh inode from server now ? BB */
1148
1149         /* need to flush data before changing file size on server */
1150         filemap_write_and_wait(direntry->d_inode->i_mapping);
1151
1152         if (attrs->ia_valid & ATTR_SIZE) {
1153                 /* To avoid spurious oplock breaks from server, in the case of
1154                    inodes that we already have open, avoid doing path based
1155                    setting of file size if we can do it by handle.
1156                    This keeps our caching token (oplock) and avoids timeouts
1157                    when the local oplock break takes longer to flush
1158                    writebehind data than the SMB timeout for the SetPathInfo
1159                    request would allow */
1160                 open_file = find_writable_file(cifsInode);
1161                 if (open_file) {
1162                         __u16 nfid = open_file->netfid;
1163                         __u32 npid = open_file->pid;
1164                         rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1165                                                 nfid, npid, FALSE);
1166                         atomic_dec(&open_file->wrtPending);
1167                         cFYI(1,("SetFSize for attrs rc = %d", rc));
1168                         if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1169                                 int bytes_written;
1170                                 rc = CIFSSMBWrite(xid, pTcon,
1171                                                   nfid, 0, attrs->ia_size,
1172                                                   &bytes_written, NULL, NULL,
1173                                                   1 /* 45 seconds */);
1174                                 cFYI(1,("Wrt seteof rc %d", rc));
1175                         }
1176                 } else
1177                         rc = -EINVAL;
1178
1179                 if (rc != 0) {
1180                         /* Set file size by pathname rather than by handle
1181                            either because no valid, writeable file handle for
1182                            it was found or because there was an error setting
1183                            it by handle */
1184                         rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1185                                            attrs->ia_size, FALSE,
1186                                            cifs_sb->local_nls,
1187                                            cifs_sb->mnt_cifs_flags &
1188                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1189                         cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1190                         if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1191                                 __u16 netfid;
1192                                 int oplock = FALSE;
1193
1194                                 rc = SMBLegacyOpen(xid, pTcon, full_path,
1195                                         FILE_OPEN,
1196                                         SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1197                                         CREATE_NOT_DIR, &netfid, &oplock,
1198                                         NULL, cifs_sb->local_nls,
1199                                         cifs_sb->mnt_cifs_flags &
1200                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1201                                 if (rc==0) {
1202                                         int bytes_written;
1203                                         rc = CIFSSMBWrite(xid, pTcon,
1204                                                         netfid, 0,
1205                                                         attrs->ia_size,
1206                                                         &bytes_written, NULL,
1207                                                         NULL, 1 /* 45 sec */);
1208                                         cFYI(1,("wrt seteof rc %d",rc));
1209                                         CIFSSMBClose(xid, pTcon, netfid);
1210                                 }
1211
1212                         }
1213                 }
1214
1215                 /* Server is ok setting allocation size implicitly - no need
1216                    to call:
1217                 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1218                          cifs_sb->local_nls);
1219                    */
1220
1221                 if (rc == 0) {
1222                         rc = vmtruncate(direntry->d_inode, attrs->ia_size);
1223                         cifs_truncate_page(direntry->d_inode->i_mapping,
1224                                            direntry->d_inode->i_size);
1225                 } else
1226                         goto cifs_setattr_exit;
1227         }
1228         if (attrs->ia_valid & ATTR_UID) {
1229                 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1230                 uid = attrs->ia_uid;
1231         }
1232         if (attrs->ia_valid & ATTR_GID) {
1233                 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1234                 gid = attrs->ia_gid;
1235         }
1236
1237         time_buf.Attributes = 0;
1238         if (attrs->ia_valid & ATTR_MODE) {
1239                 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1240                 mode = attrs->ia_mode;
1241         }
1242
1243         if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1244             && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1245                 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1246                                          0 /* dev_t */, cifs_sb->local_nls,
1247                                          cifs_sb->mnt_cifs_flags &
1248                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1249         else if (attrs->ia_valid & ATTR_MODE) {
1250                 rc = 0;
1251                 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1252                         if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0)
1253                                 time_buf.Attributes =
1254                                         cpu_to_le32(cifsInode->cifsAttrs |
1255                                                     ATTR_READONLY);
1256                 } else if ((mode & S_IWUGO) == S_IWUGO) {
1257                         if (cifsInode->cifsAttrs & ATTR_READONLY)
1258                                 time_buf.Attributes =
1259                                         cpu_to_le32(cifsInode->cifsAttrs &
1260                                                     (~ATTR_READONLY));
1261                 }
1262                 /* BB to be implemented -
1263                    via Windows security descriptors or streams */
1264                 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1265                                       cifs_sb->local_nls); */
1266         }
1267
1268         if (attrs->ia_valid & ATTR_ATIME) {
1269                 set_time = TRUE;
1270                 time_buf.LastAccessTime =
1271                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1272         } else
1273                 time_buf.LastAccessTime = 0;
1274
1275         if (attrs->ia_valid & ATTR_MTIME) {
1276                 set_time = TRUE;
1277                 time_buf.LastWriteTime =
1278                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1279         } else
1280                 time_buf.LastWriteTime = 0;
1281         /* Do not set ctime explicitly unless other time
1282            stamps are changed explicitly (i.e. by utime()
1283            since we would then have a mix of client and
1284            server times */
1285
1286         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1287                 set_time = TRUE;
1288                 /* Although Samba throws this field away
1289                 it may be useful to Windows - but we do
1290                 not want to set ctime unless some other
1291                 timestamp is changing */
1292                 cFYI(1, ("CIFS - CTIME changed"));
1293                 time_buf.ChangeTime =
1294                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1295         } else
1296                 time_buf.ChangeTime = 0;
1297
1298         if (set_time || time_buf.Attributes) {
1299                 time_buf.CreationTime = 0;      /* do not change */
1300                 /* In the future we should experiment - try setting timestamps
1301                    via Handle (SetFileInfo) instead of by path */
1302                 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1303                         rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1304                                              cifs_sb->local_nls,
1305                                              cifs_sb->mnt_cifs_flags &
1306                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1307                 else
1308                         rc = -EOPNOTSUPP;
1309
1310                 if (rc == -EOPNOTSUPP) {
1311                         int oplock = FALSE;
1312                         __u16 netfid;
1313
1314                         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1315                                  "times not supported by this server"));
1316                         /* BB we could scan to see if we already have it open
1317                            and pass in pid of opener to function */
1318                         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1319                                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1320                                          CREATE_NOT_DIR, &netfid, &oplock,
1321                                          NULL, cifs_sb->local_nls,
1322                                          cifs_sb->mnt_cifs_flags &
1323                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1324                         if (rc==0) {
1325                                 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1326                                                          netfid);
1327                                 CIFSSMBClose(xid, pTcon, netfid);
1328                         } else {
1329                         /* BB For even older servers we could convert time_buf
1330                            into old DOS style which uses two second
1331                            granularity */
1332
1333                         /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1334                                         &time_buf, cifs_sb->local_nls); */
1335                         }
1336                 }
1337                 /* Even if error on time set, no sense failing the call if
1338                 the server would set the time to a reasonable value anyway,
1339                 and this check ensures that we are not being called from
1340                 sys_utimes in which case we ought to fail the call back to
1341                 the user when the server rejects the call */
1342                 if((rc) && (attrs->ia_valid &&
1343                          (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1344                         rc = 0;
1345         }
1346
1347         /* do not need local check to inode_check_ok since the server does
1348            that */
1349         if (!rc)
1350                 rc = inode_setattr(direntry->d_inode, attrs);
1351 cifs_setattr_exit:
1352         kfree(full_path);
1353         FreeXid(xid);
1354         return rc;
1355 }
1356
1357 void cifs_delete_inode(struct inode *inode)
1358 {
1359         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1360         /* may have to add back in if and when safe distributed caching of
1361            directories added e.g. via FindNotify */
1362 }