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