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/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                 /* BB add code here -
 492                    validate if device or weird share or device type? */
 493                 }
 494                 if (is_size_safe_to_change(cifsInfo)) {
 495                         /* can not safely change the file size here if the
 496                            client is writing to it due to potential races */
 497                         i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));
 498
 499                         /* 512 bytes (2**9) is the fake blocksize that must be
 500                            used for this calculation */
 501                         inode->i_blocks = (512 - 1 + le64_to_cpu(
 502                                            pfindData->AllocationSize)) >> 9;
 503                 }
 504
 505                 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 506
 507                 /* BB fill in uid and gid here? with help from winbind?
 508                    or retrieve from NTFS stream extended attribute */
 509                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 510                         /* fill in uid, gid, mode from server ACL */
 511                         get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
 512                 } else if (atomic_read(&cifsInfo->inUse) == 0) {
 513                         inode->i_uid = cifs_sb->mnt_uid;
 514                         inode->i_gid = cifs_sb->mnt_gid;
 515                         /* set so we do not keep refreshing these fields with
 516                            bad data after user has changed them in memory */
 517                         atomic_set(&cifsInfo->inUse,1);
 518                 }
 519
 520                 if (S_ISREG(inode->i_mode)) {
 521                         cFYI(1, ("File inode"));
 522                         inode->i_op = &cifs_file_inode_ops;
 523                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 524                                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 525                                         inode->i_fop =
 526                                                 &cifs_file_direct_nobrl_ops;
 527                                 else
 528                                         inode->i_fop = &cifs_file_direct_ops;
 529                         } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 530                                 inode->i_fop = &cifs_file_nobrl_ops;
 531                         else /* not direct, send byte range locks */
 532                                 inode->i_fop = &cifs_file_ops;
 533
 534                         if(pTcon->ses->server->maxBuf <
 535                              PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
 536                                 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 537                         else
 538                                 inode->i_data.a_ops = &cifs_addr_ops;
 539                 } else if (S_ISDIR(inode->i_mode)) {
 540                         cFYI(1, ("Directory inode"));
 541                         inode->i_op = &cifs_dir_inode_ops;
 542                         inode->i_fop = &cifs_dir_ops;
 543                 } else if (S_ISLNK(inode->i_mode)) {
 544                         cFYI(1, ("Symbolic Link inode"));
 545                         inode->i_op = &cifs_symlink_inode_ops;
 546                 } else {
 547                         init_special_inode(inode, inode->i_mode,
 548                                            inode->i_rdev);
 549                 }
 550         }
 551         kfree(buf);
 552         return rc;
 553 }
 554
 555 /* gets root inode */
 556 void cifs_read_inode(struct inode *inode)
 557 {
 558         int xid;
 559         struct cifs_sb_info *cifs_sb;
 560
 561         cifs_sb = CIFS_SB(inode->i_sb);
 562         xid = GetXid();
 563         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
 564                 cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
 565         else
 566                 cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
 567         /* can not call macro FreeXid here since in a void func */
 568         _FreeXid(xid);
 569 }
 570
 571 int cifs_unlink(struct inode *inode, struct dentry *direntry)
 572 {
 573         int rc = 0;
 574         int xid;
 575         struct cifs_sb_info *cifs_sb;
 576         struct cifsTconInfo *pTcon;
 577         char *full_path = NULL;
 578         struct cifsInodeInfo *cifsInode;
 579         FILE_BASIC_INFO *pinfo_buf;
 580
 581         cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
 582
 583         xid = GetXid();
 584
 585         if(inode)
 586                 cifs_sb = CIFS_SB(inode->i_sb);
 587         else
 588                 cifs_sb = CIFS_SB(direntry->d_sb);
 589         pTcon = cifs_sb->tcon;
 590
 591         /* Unlink can be called from rename so we can not grab the sem here
 592            since we deadlock otherwise */
 593 /*      mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
 594         full_path = build_path_from_dentry(direntry);
 595 /*      mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
 596         if (full_path == NULL) {
 597                 FreeXid(xid);
 598                 return -ENOMEM;
 599         }
 600         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
 601                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 602
 603         if (!rc) {
 604                 if (direntry->d_inode)
 605                         drop_nlink(direntry->d_inode);
 606         } else if (rc == -ENOENT) {
 607                 d_drop(direntry);
 608         } else if (rc == -ETXTBSY) {
 609                 int oplock = FALSE;
 610                 __u16 netfid;
 611
 612                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
 613                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
 614                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
 615                                  cifs_sb->mnt_cifs_flags &
 616                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 617                 if (rc==0) {
 618                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
 619                                               cifs_sb->local_nls,
 620                                               cifs_sb->mnt_cifs_flags &
 621                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 622                         CIFSSMBClose(xid, pTcon, netfid);
 623                         if (direntry->d_inode)
 624                                 drop_nlink(direntry->d_inode);
 625                 }
 626         } else if (rc == -EACCES) {
 627                 /* try only if r/o attribute set in local lookup data? */
 628                 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
 629                 if (pinfo_buf) {
 630                         /* ATTRS set to normal clears r/o bit */
 631                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
 632                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
 633                                 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
 634                                                      pinfo_buf,
 635                                                      cifs_sb->local_nls,
 636                                                      cifs_sb->mnt_cifs_flags &
 637                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 638                         else
 639                                 rc = -EOPNOTSUPP;
 640
 641                         if (rc == -EOPNOTSUPP) {
 642                                 int oplock = FALSE;
 643                                 __u16 netfid;
 644                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
 645                                                           full_path,
 646                                                           (__u16)ATTR_NORMAL,
 647                                                           cifs_sb->local_nls);
 648                            For some strange reason it seems that NT4 eats the
 649                            old setattr call without actually setting the
 650                            attributes so on to the third attempted workaround
 651                            */
 652
 653                         /* BB could scan to see if we already have it open
 654                            and pass in pid of opener to function */
 655                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 656                                                  FILE_OPEN, SYNCHRONIZE |
 657                                                  FILE_WRITE_ATTRIBUTES, 0,
 658                                                  &netfid, &oplock, NULL,
 659                                                  cifs_sb->local_nls,
 660                                                  cifs_sb->mnt_cifs_flags &
 661                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 662                                 if (rc==0) {
 663                                         rc = CIFSSMBSetFileTimes(xid, pTcon,
 664                                                                  pinfo_buf,
 665                                                                  netfid);
 666                                         CIFSSMBClose(xid, pTcon, netfid);
 667                                 }
 668                         }
 669                         kfree(pinfo_buf);
 670                 }
 671                 if (rc==0) {
 672                         rc = CIFSSMBDelFile(xid, pTcon, full_path,
 673                                             cifs_sb->local_nls,
 674                                             cifs_sb->mnt_cifs_flags &
 675                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 676                         if (!rc) {
 677                                 if (direntry->d_inode)
 678                                         drop_nlink(direntry->d_inode);
 679                         } else if (rc == -ETXTBSY) {
 680                                 int oplock = FALSE;
 681                                 __u16 netfid;
 682
 683                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 684                                                  FILE_OPEN, DELETE,
 685                                                  CREATE_NOT_DIR |
 686                                                  CREATE_DELETE_ON_CLOSE,
 687                                                  &netfid, &oplock, NULL,
 688                                                  cifs_sb->local_nls,
 689                                                  cifs_sb->mnt_cifs_flags &
 690                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 691                                 if (rc==0) {
 692                                         CIFSSMBRenameOpenFile(xid, pTcon,
 693                                                 netfid, NULL,
 694                                                 cifs_sb->local_nls,
 695                                                 cifs_sb->mnt_cifs_flags &
 696                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 697                                         CIFSSMBClose(xid, pTcon, netfid);
 698                                         if (direntry->d_inode)
 699                                                 drop_nlink(direntry->d_inode);
 700                                 }
 701                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
 702                         }
 703                 }
 704         }
 705         if (direntry->d_inode) {
 706                 cifsInode = CIFS_I(direntry->d_inode);
 707                 cifsInode->time = 0;    /* will force revalidate to get info
 708                                            when needed */
 709                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
 710         }
 711         if(inode) {
 712                 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
 713                 cifsInode = CIFS_I(inode);
 714                 cifsInode->time = 0;    /* force revalidate of dir as well */
 715         }
 716
 717         kfree(full_path);
 718         FreeXid(xid);
 719         return rc;
 720 }
 721
 722 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 723 {
 724         int rc = 0;
 725         int xid;
 726         struct cifs_sb_info *cifs_sb;
 727         struct cifsTconInfo *pTcon;
 728         char *full_path = NULL;
 729         struct inode *newinode = NULL;
 730
 731         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 732
 733         xid = GetXid();
 734
 735         cifs_sb = CIFS_SB(inode->i_sb);
 736         pTcon = cifs_sb->tcon;
 737
 738         full_path = build_path_from_dentry(direntry);
 739         if (full_path == NULL) {
 740                 FreeXid(xid);
 741                 return -ENOMEM;
 742         }
 743         /* BB add setting the equivalent of mode via CreateX w/ACLs */
 744         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
 745                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 746         if (rc) {
 747                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
 748                 d_drop(direntry);
 749         } else {
 750                 inc_nlink(inode);
 751                 if (pTcon->ses->capabilities & CAP_UNIX)
 752                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 753                                                       inode->i_sb,xid);
 754                 else
 755                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 756                                                  inode->i_sb,xid);
 757
 758                 if (pTcon->nocase)
 759                         direntry->d_op = &cifs_ci_dentry_ops;
 760                 else
 761                         direntry->d_op = &cifs_dentry_ops;
 762                 d_instantiate(direntry, newinode);
 763                 if (direntry->d_inode)
 764                         direntry->d_inode->i_nlink = 2;
 765                 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
 766                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 767                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 768                                                     mode,
 769                                                     (__u64)current->fsuid,
 770                                                     (__u64)current->fsgid,
 771                                                     0 /* dev_t */,
 772                                                     cifs_sb->local_nls,
 773                                                     cifs_sb->mnt_cifs_flags &
 774                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 775                         } else {
 776                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 777                                                     mode, (__u64)-1,
 778                                                     (__u64)-1, 0 /* dev_t */,
 779                                                     cifs_sb->local_nls,
 780                                                     cifs_sb->mnt_cifs_flags &
 781                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 782                         }
 783                 else {
 784                         /* BB to be implemented via Windows secrty descriptors
 785                            eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
 786                                                  -1, -1, local_nls); */
 787                         if(direntry->d_inode) {
 788                                 direntry->d_inode->i_mode = mode;
 789                                 direntry->d_inode->i_mode |= S_IFDIR;
 790                                 if(cifs_sb->mnt_cifs_flags &
 791                                      CIFS_MOUNT_SET_UID) {
 792                                         direntry->d_inode->i_uid =
 793                                                 current->fsuid;
 794                                         direntry->d_inode->i_gid =
 795                                                 current->fsgid;
 796                                 }
 797                         }
 798                 }
 799         }
 800         kfree(full_path);
 801         FreeXid(xid);
 802         return rc;
 803 }
 804
 805 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 806 {
 807         int rc = 0;
 808         int xid;
 809         struct cifs_sb_info *cifs_sb;
 810         struct cifsTconInfo *pTcon;
 811         char *full_path = NULL;
 812         struct cifsInodeInfo *cifsInode;
 813
 814         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
 815
 816         xid = GetXid();
 817
 818         cifs_sb = CIFS_SB(inode->i_sb);
 819         pTcon = cifs_sb->tcon;
 820
 821         full_path = build_path_from_dentry(direntry);
 822         if (full_path == NULL) {
 823                 FreeXid(xid);
 824                 return -ENOMEM;
 825         }
 826
 827         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
 828                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 829
 830         if (!rc) {
 831                 drop_nlink(inode);
 832                 i_size_write(direntry->d_inode,0);
 833                 clear_nlink(direntry->d_inode);
 834         }
 835
 836         cifsInode = CIFS_I(direntry->d_inode);
 837         cifsInode->time = 0;    /* force revalidate to go get info when
 838                                    needed */
 839         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
 840                 current_fs_time(inode->i_sb);
 841
 842         kfree(full_path);
 843         FreeXid(xid);
 844         return rc;
 845 }
 846
 847 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
 848         struct inode *target_inode, struct dentry *target_direntry)
 849 {
 850         char *fromName;
 851         char *toName;
 852         struct cifs_sb_info *cifs_sb_source;
 853         struct cifs_sb_info *cifs_sb_target;
 854         struct cifsTconInfo *pTcon;
 855         int xid;
 856         int rc = 0;
 857
 858         xid = GetXid();
 859
 860         cifs_sb_target = CIFS_SB(target_inode->i_sb);
 861         cifs_sb_source = CIFS_SB(source_inode->i_sb);
 862         pTcon = cifs_sb_source->tcon;
 863
 864         if (pTcon != cifs_sb_target->tcon) {
 865                 FreeXid(xid);
 866                 return -EXDEV;  /* BB actually could be allowed if same server,
 867                                    but different share.
 868                                    Might eventually add support for this */
 869         }
 870
 871         /* we already  have the rename sem so we do not need to grab it again
 872            here to protect the path integrity */
 873         fromName = build_path_from_dentry(source_direntry);
 874         toName = build_path_from_dentry(target_direntry);
 875         if ((fromName == NULL) || (toName == NULL)) {
 876                 rc = -ENOMEM;
 877                 goto cifs_rename_exit;
 878         }
 879
 880         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
 881                            cifs_sb_source->local_nls,
 882                            cifs_sb_source->mnt_cifs_flags &
 883                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 884         if (rc == -EEXIST) {
 885                 /* check if they are the same file because rename of hardlinked
 886                    files is a noop */
 887                 FILE_UNIX_BASIC_INFO *info_buf_source;
 888                 FILE_UNIX_BASIC_INFO *info_buf_target;
 889
 890                 info_buf_source =
 891                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 892                 if (info_buf_source != NULL) {
 893                         info_buf_target = info_buf_source + 1;
 894                         if (pTcon->ses->capabilities & CAP_UNIX)
 895                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
 896                                         info_buf_source,
 897                                         cifs_sb_source->local_nls,
 898                                         cifs_sb_source->mnt_cifs_flags &
 899                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 900                         /* else rc is still EEXIST so will fall through to
 901                            unlink the target and retry rename */
 902                         if (rc == 0) {
 903                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
 904                                                 info_buf_target,
 905                                                 cifs_sb_target->local_nls,
 906                                                 /* remap based on source sb */
 907                                                 cifs_sb_source->mnt_cifs_flags &
 908                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 909                         }
 910                         if ((rc == 0) &&
 911                             (info_buf_source->UniqueId ==
 912                              info_buf_target->UniqueId)) {
 913                         /* do not rename since the files are hardlinked which
 914                            is a noop */
 915                         } else {
 916                         /* we either can not tell the files are hardlinked
 917                            (as with Windows servers) or files are not
 918                            hardlinked so delete the target manually before
 919                            renaming to follow POSIX rather than Windows
 920                            semantics */
 921                                 cifs_unlink(target_inode, target_direntry);
 922                                 rc = CIFSSMBRename(xid, pTcon, fromName,
 923                                                    toName,
 924                                                    cifs_sb_source->local_nls,
 925                                                    cifs_sb_source->mnt_cifs_flags
 926                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
 927                         }
 928                         kfree(info_buf_source);
 929                 } /* if we can not get memory just leave rc as EEXIST */
 930         }
 931
 932         if (rc) {
 933                 cFYI(1, ("rename rc %d", rc));
 934         }
 935
 936         if ((rc == -EIO) || (rc == -EEXIST)) {
 937                 int oplock = FALSE;
 938                 __u16 netfid;
 939
 940                 /* BB FIXME Is Generic Read correct for rename? */
 941                 /* if renaming directory - we should not say CREATE_NOT_DIR,
 942                    need to test renaming open directory, also GENERIC_READ
 943                    might not right be right access to request */
 944                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
 945                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
 946                                  cifs_sb_source->local_nls,
 947                                  cifs_sb_source->mnt_cifs_flags &
 948                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 949                 if (rc==0) {
 950                         rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
 951                                               cifs_sb_source->local_nls,
 952                                               cifs_sb_source->mnt_cifs_flags &
 953                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 954                         CIFSSMBClose(xid, pTcon, netfid);
 955                 }
 956         }
 957
 958 cifs_rename_exit:
 959         kfree(fromName);
 960         kfree(toName);
 961         FreeXid(xid);
 962         return rc;
 963 }
 964
 965 int cifs_revalidate(struct dentry *direntry)
 966 {
 967         int xid;
 968         int rc = 0;
 969         char *full_path;
 970         struct cifs_sb_info *cifs_sb;
 971         struct cifsInodeInfo *cifsInode;
 972         loff_t local_size;
 973         struct timespec local_mtime;
 974         int invalidate_inode = FALSE;
 975
 976         if (direntry->d_inode == NULL)
 977                 return -ENOENT;
 978
 979         cifsInode = CIFS_I(direntry->d_inode);
 980
 981         if (cifsInode == NULL)
 982                 return -ENOENT;
 983
 984         /* no sense revalidating inode info on file that no one can write */
 985         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
 986                 return rc;
 987
 988         xid = GetXid();
 989
 990         cifs_sb = CIFS_SB(direntry->d_sb);
 991
 992         /* can not safely grab the rename sem here if rename calls revalidate
 993            since that would deadlock */
 994         full_path = build_path_from_dentry(direntry);
 995         if (full_path == NULL) {
 996                 FreeXid(xid);
 997                 return -ENOMEM;
 998         }
 999         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1000                  "jiffies %ld", full_path, direntry->d_inode,
1001                  direntry->d_inode->i_count.counter, direntry,
1002                  direntry->d_time, jiffies));
1003
1004         if (cifsInode->time == 0) {
1005                 /* was set to zero previously to force revalidate */
1006         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1007                    lookupCacheEnabled) {
1008                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1009                     (direntry->d_inode->i_nlink == 1)) {
1010                         kfree(full_path);
1011                         FreeXid(xid);
1012                         return rc;
1013                 } else {
1014                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1015                 }
1016         }
1017
1018         /* save mtime and size */
1019         local_mtime = direntry->d_inode->i_mtime;
1020         local_size = direntry->d_inode->i_size;
1021
1022         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
1023                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1024                                               direntry->d_sb,xid);
1025                 if (rc) {
1026                         cFYI(1, ("error on getting revalidate info %d", rc));
1027 /*                      if (rc != -ENOENT)
1028                                 rc = 0; */      /* BB should we cache info on
1029                                                    certain errors? */
1030                 }
1031         } else {
1032                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1033                                          direntry->d_sb,xid);
1034                 if (rc) {
1035                         cFYI(1, ("error on getting revalidate info %d", rc));
1036 /*                      if (rc != -ENOENT)
1037                                 rc = 0; */      /* BB should we cache info on
1038                                                    certain errors? */
1039                 }
1040         }
1041         /* should we remap certain errors, access denied?, to zero */
1042
1043         /* if not oplocked, we invalidate inode pages if mtime or file size
1044            had changed on server */
1045
1046         if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) &&
1047             (local_size == direntry->d_inode->i_size)) {
1048                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1049         } else {
1050                 /* file may have changed on server */
1051                 if (cifsInode->clientCanCacheRead) {
1052                         /* no need to invalidate inode pages since we were the
1053                            only ones who could have modified the file and the
1054                            server copy is staler than ours */
1055                 } else {
1056                         invalidate_inode = TRUE;
1057                 }
1058         }
1059
1060         /* can not grab this sem since kernel filesys locking documentation
1061            indicates i_mutex may be taken by the kernel on lookup and rename
1062            which could deadlock if we grab the i_mutex here as well */
1063 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1064         /* need to write out dirty pages here  */
1065         if (direntry->d_inode->i_mapping) {
1066                 /* do we need to lock inode until after invalidate completes
1067                    below? */
1068                 filemap_fdatawrite(direntry->d_inode->i_mapping);
1069         }
1070         if (invalidate_inode) {
1071         /* shrink_dcache not necessary now that cifs dentry ops
1072         are exported for negative dentries */
1073 /*              if(S_ISDIR(direntry->d_inode->i_mode))
1074                         shrink_dcache_parent(direntry); */
1075                 if (S_ISREG(direntry->d_inode->i_mode)) {
1076                         if (direntry->d_inode->i_mapping)
1077                                 filemap_fdatawait(direntry->d_inode->i_mapping);
1078                         /* may eventually have to do this for open files too */
1079                         if (list_empty(&(cifsInode->openFileList))) {
1080                                 /* changed on server - flush read ahead pages */
1081                                 cFYI(1, ("Invalidating read ahead data on "
1082                                          "closed file"));
1083                                 invalidate_remote_inode(direntry->d_inode);
1084                         }
1085                 }
1086         }
1087 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1088
1089         kfree(full_path);
1090         FreeXid(xid);
1091         return rc;
1092 }
1093
1094 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1095         struct kstat *stat)
1096 {
1097         int err = cifs_revalidate(dentry);
1098         if (!err) {
1099                 generic_fillattr(dentry->d_inode, stat);
1100                 stat->blksize = CIFS_MAX_MSGSIZE;
1101         }
1102         return err;
1103 }
1104
1105 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1106 {
1107         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1108         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1109         struct page *page;
1110         char *kaddr;
1111         int rc = 0;
1112
1113         page = grab_cache_page(mapping, index);
1114         if (!page)
1115                 return -ENOMEM;
1116
1117         kaddr = kmap_atomic(page, KM_USER0);
1118         memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1119         flush_dcache_page(page);
1120         kunmap_atomic(kaddr, KM_USER0);
1121         unlock_page(page);
1122         page_cache_release(page);
1123         return rc;
1124 }
1125
1126 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1127 {
1128         int xid;
1129         struct cifs_sb_info *cifs_sb;
1130         struct cifsTconInfo *pTcon;
1131         char *full_path = NULL;
1132         int rc = -EACCES;
1133         struct cifsFileInfo *open_file = NULL;
1134         FILE_BASIC_INFO time_buf;
1135         int set_time = FALSE;
1136         __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1137         __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1138         __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1139         struct cifsInodeInfo *cifsInode;
1140
1141         xid = GetXid();
1142
1143         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1144                  direntry->d_name.name, attrs->ia_valid));
1145
1146         cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1147         pTcon = cifs_sb->tcon;
1148
1149         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1150                 /* check if we have permission to change attrs */
1151                 rc = inode_change_ok(direntry->d_inode, attrs);
1152                 if(rc < 0) {
1153                         FreeXid(xid);
1154                         return rc;
1155                 } else
1156                         rc = 0;
1157         }
1158
1159         full_path = build_path_from_dentry(direntry);
1160         if (full_path == NULL) {
1161                 FreeXid(xid);
1162                 return -ENOMEM;
1163         }
1164         cifsInode = CIFS_I(direntry->d_inode);
1165
1166         /* BB check if we need to refresh inode from server now ? BB */
1167
1168         /* need to flush data before changing file size on server */
1169         filemap_write_and_wait(direntry->d_inode->i_mapping);
1170
1171         if (attrs->ia_valid & ATTR_SIZE) {
1172                 /* To avoid spurious oplock breaks from server, in the case of
1173                    inodes that we already have open, avoid doing path based
1174                    setting of file size if we can do it by handle.
1175                    This keeps our caching token (oplock) and avoids timeouts
1176                    when the local oplock break takes longer to flush
1177                    writebehind data than the SMB timeout for the SetPathInfo
1178                    request would allow */
1179
1180                 open_file = find_writable_file(cifsInode);
1181                 if (open_file) {
1182                         __u16 nfid = open_file->netfid;
1183                         __u32 npid = open_file->pid;
1184                         rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1185                                                 nfid, npid, FALSE);
1186                         atomic_dec(&open_file->wrtPending);
1187                         cFYI(1,("SetFSize for attrs rc = %d", rc));
1188                         if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1189                                 int bytes_written;
1190                                 rc = CIFSSMBWrite(xid, pTcon,
1191                                                   nfid, 0, attrs->ia_size,
1192                                                   &bytes_written, NULL, NULL,
1193                                                   1 /* 45 seconds */);
1194                                 cFYI(1,("Wrt seteof rc %d", rc));
1195                         }
1196                 } else
1197                         rc = -EINVAL;
1198
1199                 if (rc != 0) {
1200                         /* Set file size by pathname rather than by handle
1201                            either because no valid, writeable file handle for
1202                            it was found or because there was an error setting
1203                            it by handle */
1204                         rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1205                                            attrs->ia_size, FALSE,
1206                                            cifs_sb->local_nls,
1207                                            cifs_sb->mnt_cifs_flags &
1208                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1209                         cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1210                         if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1211                                 __u16 netfid;
1212                                 int oplock = FALSE;
1213
1214                                 rc = SMBLegacyOpen(xid, pTcon, full_path,
1215                                         FILE_OPEN,
1216                                         SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1217                                         CREATE_NOT_DIR, &netfid, &oplock,
1218                                         NULL, cifs_sb->local_nls,
1219                                         cifs_sb->mnt_cifs_flags &
1220                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1221                                 if (rc==0) {
1222                                         int bytes_written;
1223                                         rc = CIFSSMBWrite(xid, pTcon,
1224                                                         netfid, 0,
1225                                                         attrs->ia_size,
1226                                                         &bytes_written, NULL,
1227                                                         NULL, 1 /* 45 sec */);
1228                                         cFYI(1,("wrt seteof rc %d",rc));
1229                                         CIFSSMBClose(xid, pTcon, netfid);
1230                                 }
1231
1232                         }
1233                 }
1234
1235                 /* Server is ok setting allocation size implicitly - no need
1236                    to call:
1237                 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1238                          cifs_sb->local_nls);
1239                    */
1240
1241                 if (rc == 0) {
1242                         rc = vmtruncate(direntry->d_inode, attrs->ia_size);
1243                         cifs_truncate_page(direntry->d_inode->i_mapping,
1244                                            direntry->d_inode->i_size);
1245                 } else
1246                         goto cifs_setattr_exit;
1247         }
1248         if (attrs->ia_valid & ATTR_UID) {
1249                 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1250                 uid = attrs->ia_uid;
1251         }
1252         if (attrs->ia_valid & ATTR_GID) {
1253                 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1254                 gid = attrs->ia_gid;
1255         }
1256
1257         time_buf.Attributes = 0;
1258         if (attrs->ia_valid & ATTR_MODE) {
1259                 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1260                 mode = attrs->ia_mode;
1261         }
1262
1263         if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1264             && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1265                 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1266                                          0 /* dev_t */, cifs_sb->local_nls,
1267                                          cifs_sb->mnt_cifs_flags &
1268                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1269         else if (attrs->ia_valid & ATTR_MODE) {
1270                 rc = 0;
1271                 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1272                         if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0)
1273                                 time_buf.Attributes =
1274                                         cpu_to_le32(cifsInode->cifsAttrs |
1275                                                     ATTR_READONLY);
1276                 } else if ((mode & S_IWUGO) == S_IWUGO) {
1277                         if (cifsInode->cifsAttrs & ATTR_READONLY)
1278                                 time_buf.Attributes =
1279                                         cpu_to_le32(cifsInode->cifsAttrs &
1280                                                     (~ATTR_READONLY));
1281                 }
1282                 /* BB to be implemented -
1283                    via Windows security descriptors or streams */
1284                 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1285                                       cifs_sb->local_nls); */
1286         }
1287
1288         if (attrs->ia_valid & ATTR_ATIME) {
1289                 set_time = TRUE;
1290                 time_buf.LastAccessTime =
1291                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1292         } else
1293                 time_buf.LastAccessTime = 0;
1294
1295         if (attrs->ia_valid & ATTR_MTIME) {
1296                 set_time = TRUE;
1297                 time_buf.LastWriteTime =
1298                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1299         } else
1300                 time_buf.LastWriteTime = 0;
1301         /* Do not set ctime explicitly unless other time
1302            stamps are changed explicitly (i.e. by utime()
1303            since we would then have a mix of client and
1304            server times */
1305
1306         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1307                 set_time = TRUE;
1308                 /* Although Samba throws this field away
1309                 it may be useful to Windows - but we do
1310                 not want to set ctime unless some other
1311                 timestamp is changing */
1312                 cFYI(1, ("CIFS - CTIME changed"));
1313                 time_buf.ChangeTime =
1314                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1315         } else
1316                 time_buf.ChangeTime = 0;
1317
1318         if (set_time || time_buf.Attributes) {
1319                 time_buf.CreationTime = 0;      /* do not change */
1320                 /* In the future we should experiment - try setting timestamps
1321                    via Handle (SetFileInfo) instead of by path */
1322                 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1323                         rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1324                                              cifs_sb->local_nls,
1325                                              cifs_sb->mnt_cifs_flags &
1326                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1327                 else
1328                         rc = -EOPNOTSUPP;
1329
1330                 if (rc == -EOPNOTSUPP) {
1331                         int oplock = FALSE;
1332                         __u16 netfid;
1333
1334                         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1335                                  "times not supported by this server"));
1336                         /* BB we could scan to see if we already have it open
1337                            and pass in pid of opener to function */
1338                         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1339                                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1340                                          CREATE_NOT_DIR, &netfid, &oplock,
1341                                          NULL, cifs_sb->local_nls,
1342                                          cifs_sb->mnt_cifs_flags &
1343                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1344                         if (rc==0) {
1345                                 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1346                                                          netfid);
1347                                 CIFSSMBClose(xid, pTcon, netfid);
1348                         } else {
1349                         /* BB For even older servers we could convert time_buf
1350                            into old DOS style which uses two second
1351                            granularity */
1352
1353                         /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1354                                         &time_buf, cifs_sb->local_nls); */
1355                         }
1356                 }
1357                 /* Even if error on time set, no sense failing the call if
1358                 the server would set the time to a reasonable value anyway,
1359                 and this check ensures that we are not being called from
1360                 sys_utimes in which case we ought to fail the call back to
1361                 the user when the server rejects the call */
1362                 if((rc) && (attrs->ia_valid &&
1363                          (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1364                         rc = 0;
1365         }
1366
1367         /* do not need local check to inode_check_ok since the server does
1368            that */
1369         if (!rc)
1370                 rc = inode_setattr(direntry->d_inode, attrs);
1371 cifs_setattr_exit:
1372         kfree(full_path);
1373         FreeXid(xid);
1374         return rc;
1375 }
1376
1377 void cifs_delete_inode(struct inode *inode)
1378 {
1379         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1380         /* may have to add back in if and when safe distributed caching of
1381            directories added e.g. via FindNotify */
1382 }