fs/cifs/inode.c

   1 /*
   2  *   fs/cifs/inode.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2005
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21 #include <linux/fs.h>
  22 #include <linux/buffer_head.h>
  23 #include <linux/stat.h>
  24 #include <linux/pagemap.h>
  25 #include <asm/div64.h>
  26 #include "cifsfs.h"
  27 #include "cifspdu.h"
  28 #include "cifsglob.h"
  29 #include "cifsproto.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_fs_sb.h"
  32
  33 int cifs_get_inode_info_unix(struct inode **pinode,
  34         const unsigned char *search_path, struct super_block *sb, int xid)
  35 {
  36         int rc = 0;
  37         FILE_UNIX_BASIC_INFO findData;
  38         struct cifsTconInfo *pTcon;
  39         struct inode *inode;
  40         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
  41         char *tmp_path;
  42
  43         pTcon = cifs_sb->tcon;
  44         cFYI(1, ("Getting info on %s ", search_path));
  45         /* could have done a find first instead but this returns more info */
  46         rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
  47                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
  48                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
  49 /*      dump_mem("\nUnixQPathInfo return data", &findData,
  50                  sizeof(findData)); */
  51         if (rc) {
  52                 if (rc == -EREMOTE) {
  53                         tmp_path =
  54                             kmalloc(strnlen(pTcon->treeName,
  55                                             MAX_TREE_SIZE + 1) +
  56                                     strnlen(search_path, MAX_PATHCONF) + 1,
  57                                     GFP_KERNEL);
  58                         if (tmp_path == NULL) {
  59                                 return -ENOMEM;
  60                         }
  61                         /* have to skip first of the double backslash of
  62                            UNC name */
  63                         strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
  64                         strncat(tmp_path, search_path, MAX_PATHCONF);
  65                         rc = connect_to_dfs_path(xid, pTcon->ses,
  66                                                  /* treename + */ tmp_path,
  67                                                  cifs_sb->local_nls,
  68                                                  cifs_sb->mnt_cifs_flags &
  69                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
  70                         kfree(tmp_path);
  71
  72                         /* BB fix up inode etc. */
  73                 } else if (rc) {
  74                         return rc;
  75                 }
  76         } else {
  77                 struct cifsInodeInfo *cifsInfo;
  78                 __u32 type = le32_to_cpu(findData.Type);
  79                 __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
  80                 __u64 end_of_file = le64_to_cpu(findData.EndOfFile);
  81
  82                 /* get new inode */
  83                 if (*pinode == NULL) {
  84                         *pinode = new_inode(sb);
  85                         if (*pinode == NULL)
  86                                 return -ENOMEM;
  87                         /* Is an i_ino of zero legal? */
  88                         /* Are there sanity checks we can use to ensure that
  89                            the server is really filling in that field? */
  90                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
  91                                 (*pinode)->i_ino =
  92                                         (unsigned long)findData.UniqueId;
  93                         } /* note ino incremented to unique num in new_inode */
  94                         insert_inode_hash(*pinode);
  95                 }
  96
  97                 inode = *pinode;
  98                 cifsInfo = CIFS_I(inode);
  99
 100                 cFYI(1, ("Old time %ld ", cifsInfo->time));
 101                 cifsInfo->time = jiffies;
 102                 cFYI(1, ("New time %ld ", cifsInfo->time));
 103                 /* this is ok to set on every inode revalidate */
 104                 atomic_set(&cifsInfo->inUse,1);
 105
 106                 inode->i_atime =
 107                     cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime));
 108                 inode->i_mtime =
 109                     cifs_NTtimeToUnix(le64_to_cpu
 110                                 (findData.LastModificationTime));
 111                 inode->i_ctime =
 112                     cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange));
 113                 inode->i_mode = le64_to_cpu(findData.Permissions);
 114                 /* since we set the inode type below we need to mask off
 115                    to avoid strange results if bits set above */
 116                         inode->i_mode &= ~S_IFMT;
 117                 if (type == UNIX_FILE) {
 118                         inode->i_mode |= S_IFREG;
 119                 } else if (type == UNIX_SYMLINK) {
 120                         inode->i_mode |= S_IFLNK;
 121                 } else if (type == UNIX_DIR) {
 122                         inode->i_mode |= S_IFDIR;
 123                 } else if (type == UNIX_CHARDEV) {
 124                         inode->i_mode |= S_IFCHR;
 125                         inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
 126                                 le64_to_cpu(findData.DevMinor) & MINORMASK);
 127                 } else if (type == UNIX_BLOCKDEV) {
 128                         inode->i_mode |= S_IFBLK;
 129                         inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
 130                                 le64_to_cpu(findData.DevMinor) & MINORMASK);
 131                 } else if (type == UNIX_FIFO) {
 132                         inode->i_mode |= S_IFIFO;
 133                 } else if (type == UNIX_SOCKET) {
 134                         inode->i_mode |= S_IFSOCK;
 135                 } else {
 136                         /* safest to call it a file if we do not know */
 137                         inode->i_mode |= S_IFREG;
 138                         cFYI(1,("unknown type %d",type));
 139                 }
 140                 inode->i_uid = le64_to_cpu(findData.Uid);
 141                 inode->i_gid = le64_to_cpu(findData.Gid);
 142                 inode->i_nlink = le64_to_cpu(findData.Nlinks);
 143
 144                 if (is_size_safe_to_change(cifsInfo)) {
 145                 /* can not safely change the file size here if the
 146                    client is writing to it due to potential races */
 147
 148                         i_size_write(inode, end_of_file);
 149
 150                 /* blksize needs to be multiple of two. So safer to default to
 151                 blksize and blkbits set in superblock so 2**blkbits and blksize
 152                 will match rather than setting to:
 153                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 154
 155                 /* This seems incredibly stupid but it turns out that i_blocks
 156                    is not related to (i_size / i_blksize), instead 512 byte size
 157                    is required for calculating num blocks */
 158
 159                 /* 512 bytes (2**9) is the fake blocksize that must be used */
 160                 /* for this calculation */
 161                         inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 162                 }
 163
 164                 if (num_of_bytes < end_of_file)
 165                         cFYI(1, ("allocation size less than end of file"));
 166                 cFYI(1,
 167                      ("Size %ld and blocks %ld",
 168                       (unsigned long) inode->i_size, inode->i_blocks));
 169                 if (S_ISREG(inode->i_mode)) {
 170                         cFYI(1, ("File inode"));
 171                         inode->i_op = &cifs_file_inode_ops;
 172                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 173                                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 174                                         inode->i_fop =
 175                                                 &cifs_file_direct_nobrl_ops;
 176                                 else
 177                                         inode->i_fop = &cifs_file_direct_ops;
 178                         } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 179                                 inode->i_fop = &cifs_file_nobrl_ops;
 180                         else /* not direct, send byte range locks */
 181                                 inode->i_fop = &cifs_file_ops;
 182
 183                         inode->i_data.a_ops = &cifs_addr_ops;
 184                         /* check if server can support readpages */
 185                         if(pTcon->ses->server->maxBuf <
 186                             4096 + MAX_CIFS_HDR_SIZE)
 187                                 inode->i_data.a_ops->readpages = NULL;
 188                 } else if (S_ISDIR(inode->i_mode)) {
 189                         cFYI(1, ("Directory inode"));
 190                         inode->i_op = &cifs_dir_inode_ops;
 191                         inode->i_fop = &cifs_dir_ops;
 192                 } else if (S_ISLNK(inode->i_mode)) {
 193                         cFYI(1, ("Symbolic Link inode"));
 194                         inode->i_op = &cifs_symlink_inode_ops;
 195                 /* tmp_inode->i_fop = */ /* do not need to set to anything */
 196                 } else {
 197                         cFYI(1, ("Init special inode"));
 198                         init_special_inode(inode, inode->i_mode,
 199                                            inode->i_rdev);
 200                 }
 201         }
 202         return rc;
 203 }
 204
 205 static int decode_sfu_inode(struct inode * inode, __u64 size,
 206                             const unsigned char *path,
 207                             struct cifs_sb_info *cifs_sb, int xid)
 208 {
 209         int rc;
 210         int oplock = FALSE;
 211         __u16 netfid;
 212         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 213         char buf[8];
 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                         /* Read header */
 233                 rc = CIFSSMBRead(xid, pTcon,
 234                                  netfid,
 235                                  8 /* length */, 0 /* offset */,
 236                                  &bytes_read, &pbuf);
 237                 if((rc == 0) && (bytes_read == 8)) {
 238                         if(memcmp("IntxBLK", pbuf, 8) == 0) {
 239                                 cFYI(1,("Block device"));
 240                                 inode->i_mode |= S_IFBLK;
 241                         } else if(memcmp("IntxCHR", pbuf, 8) == 0) {
 242                                 cFYI(1,("Char device"));
 243                                 inode->i_mode |= S_IFCHR;
 244                         } else if(memcmp("IntxLNK", pbuf, 7) == 0) {
 245                                 cFYI(1,("Symlink"));
 246                                 inode->i_mode |= S_IFLNK;
 247                         }
 248                 } else {
 249                         inode->i_mode |= S_IFREG; /* then it is a file */
 250                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 251                 }
 252
 253                 CIFSSMBClose(xid, pTcon, netfid);
 254
 255
 256         /* inode->i_rdev = MKDEV(le64_to_cpu(DevMajor),
 257                             le64_to_cpu(DevMinor) & MINORMASK);*/
 258 /*      inode->i_mode |= S_IFBLK; */
 259         }
 260         return rc;
 261
 262 }
 263
 264 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 265
 266 static int get_sfu_uid_mode(struct inode * inode,
 267                         const unsigned char *path,
 268                         struct cifs_sb_info *cifs_sb, int xid)
 269 {
 270 #ifdef CONFIG_CIFS_XATTR
 271         ssize_t rc;
 272         char ea_value[4];
 273         __u32 mode;
 274
 275         rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
 276                         ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 277                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 278         if(rc < 0)
 279                 return (int)rc;
 280         else if (rc > 3) {
 281                 mode = le32_to_cpu(*((__le32 *)ea_value));
 282                 inode->i_mode &= ~SFBITS_MASK;
 283                 cFYI(1,("special bits 0%o org mode 0%o", mode, inode->i_mode));
 284                 inode->i_mode = (mode &  SFBITS_MASK) | inode->i_mode;
 285                 cFYI(1,("special mode bits 0%o", mode));
 286                 return 0;
 287         } else {
 288                 return 0;
 289         }
 290 #else
 291         return -EOPNOTSUPP;
 292 #endif
 293
 294
 295 }
 296
 297 int cifs_get_inode_info(struct inode **pinode,
 298         const unsigned char *search_path, FILE_ALL_INFO *pfindData,
 299         struct super_block *sb, int xid)
 300 {
 301         int rc = 0;
 302         struct cifsTconInfo *pTcon;
 303         struct inode *inode;
 304         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 305         char *tmp_path;
 306         char *buf = NULL;
 307
 308         pTcon = cifs_sb->tcon;
 309         cFYI(1,("Getting info on %s", search_path));
 310
 311         if ((pfindData == NULL) && (*pinode != NULL)) {
 312                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 313                         cFYI(1,("No need to revalidate cached inode sizes"));
 314                         return rc;
 315                 }
 316         }
 317
 318         /* if file info not passed in then get it from server */
 319         if (pfindData == NULL) {
 320                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 321                 if (buf == NULL)
 322                         return -ENOMEM;
 323                 pfindData = (FILE_ALL_INFO *)buf;
 324                 /* could do find first instead but this returns more info */
 325                 rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
 326                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 327                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 328                 /* BB optimize code so we do not make the above call
 329                 when server claims no NT SMB support and the above call
 330                 failed at least once - set flag in tcon or mount */
 331                 if((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 332                         rc = SMBQueryInformation(xid, pTcon, search_path,
 333                                         pfindData, cifs_sb->local_nls,
 334                                         cifs_sb->mnt_cifs_flags &
 335                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 336                 }
 337
 338         }
 339         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
 340         if (rc) {
 341                 if (rc == -EREMOTE) {
 342                         tmp_path =
 343                             kmalloc(strnlen
 344                                     (pTcon->treeName,
 345                                      MAX_TREE_SIZE + 1) +
 346                                     strnlen(search_path, MAX_PATHCONF) + 1,
 347                                     GFP_KERNEL);
 348                         if (tmp_path == NULL) {
 349                                 kfree(buf);
 350                                 return -ENOMEM;
 351                         }
 352
 353                         strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
 354                         strncat(tmp_path, search_path, MAX_PATHCONF);
 355                         rc = connect_to_dfs_path(xid, pTcon->ses,
 356                                                  /* treename + */ tmp_path,
 357                                                  cifs_sb->local_nls,
 358                                                  cifs_sb->mnt_cifs_flags &
 359                                                    CIFS_MOUNT_MAP_SPECIAL_CHR);
 360                         kfree(tmp_path);
 361                         /* BB fix up inode etc. */
 362                 } else if (rc) {
 363                         kfree(buf);
 364                         return rc;
 365                 }
 366         } else {
 367                 struct cifsInodeInfo *cifsInfo;
 368                 __u32 attr = le32_to_cpu(pfindData->Attributes);
 369
 370                 /* get new inode */
 371                 if (*pinode == NULL) {
 372                         *pinode = new_inode(sb);
 373                         if (*pinode == NULL)
 374                                 return -ENOMEM;
 375                         /* Is an i_ino of zero legal? Can we use that to check
 376                            if the server supports returning inode numbers?  Are
 377                            there other sanity checks we can use to ensure that
 378                            the server is really filling in that field? */
 379
 380                         /* We can not use the IndexNumber field by default from
 381                            Windows or Samba (in ALL_INFO buf) but we can request
 382                            it explicitly.  It may not be unique presumably if
 383                            the server has multiple devices mounted under one
 384                            share */
 385
 386                         /* There may be higher info levels that work but are
 387                            there Windows server or network appliances for which
 388                            IndexNumber field is not guaranteed unique? */
 389
 390                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM){
 391                                 int rc1 = 0;
 392                                 __u64 inode_num;
 393
 394                                 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 395                                         search_path, &inode_num,
 396                                         cifs_sb->local_nls,
 397                                         cifs_sb->mnt_cifs_flags &
 398                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 399                                 if (rc1) {
 400                                         cFYI(1,("GetSrvInodeNum rc %d", rc1));
 401                                         /* BB EOPNOSUPP disable SERVER_INUM? */
 402                                 } else /* do we need cast or hash to ino? */
 403                                         (*pinode)->i_ino = inode_num;
 404                         } /* else ino incremented to unique num in new_inode*/
 405                         insert_inode_hash(*pinode);
 406                 }
 407                 inode = *pinode;
 408                 cifsInfo = CIFS_I(inode);
 409                 cifsInfo->cifsAttrs = attr;
 410                 cFYI(1, ("Old time %ld ", cifsInfo->time));
 411                 cifsInfo->time = jiffies;
 412                 cFYI(1, ("New time %ld ", cifsInfo->time));
 413
 414                 /* blksize needs to be multiple of two. So safer to default to
 415                 blksize and blkbits set in superblock so 2**blkbits and blksize
 416                 will match rather than setting to:
 417                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 418
 419                 /* Linux can not store file creation time unfortunately so we ignore it */
 420                 inode->i_atime =
 421                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 422                 inode->i_mtime =
 423                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 424                 inode->i_ctime =
 425                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 426                 cFYI(0, ("Attributes came in as 0x%x ", attr));
 427
 428                 /* set default mode. will override for dirs below */
 429                 if (atomic_read(&cifsInfo->inUse) == 0)
 430                         /* new inode, can safely set these fields */
 431                         inode->i_mode = cifs_sb->mnt_file_mode;
 432                 else /* since we set the inode type below we need to mask off
 433                      to avoid strange results if type changes and both get orred in */
 434                         inode->i_mode &= ~S_IFMT;
 435 /*              if (attr & ATTR_REPARSE)  */
 436                 /* We no longer handle these as symlinks because we could not
 437                    follow them due to the absolute path with drive letter */
 438                 if (attr & ATTR_DIRECTORY) {
 439                 /* override default perms since we do not do byte range locking
 440                    on dirs */
 441                         inode->i_mode = cifs_sb->mnt_dir_mode;
 442                         inode->i_mode |= S_IFDIR;
 443                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 444                            (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
 445                            /* No need to le64 convert size of zero */
 446                            (pfindData->EndOfFile == 0)) {
 447                         inode->i_mode = cifs_sb->mnt_file_mode;
 448                         inode->i_mode |= S_IFIFO;
 449 /* BB Finish for SFU style symlinks and devices */
 450                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 451                            (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
 452                         if (decode_sfu_inode(inode,
 453                                          le64_to_cpu(pfindData->EndOfFile),
 454                                          search_path,
 455                                          cifs_sb, xid)) {
 456                                 cFYI(1,("Unrecognized sfu inode type"));
 457                         }
 458                         cFYI(1,("sfu mode 0%o",inode->i_mode));
 459                 } else {
 460                         inode->i_mode |= S_IFREG;
 461                         /* treat the dos attribute of read-only as read-only
 462                            mode e.g. 555 */
 463                         if (cifsInfo->cifsAttrs & ATTR_READONLY)
 464                                 inode->i_mode &= ~(S_IWUGO);
 465                 /* BB add code here -
 466                    validate if device or weird share or device type? */
 467                 }
 468                 if (is_size_safe_to_change(cifsInfo)) {
 469                         /* can not safely change the file size here if the
 470                            client is writing to it due to potential races */
 471                         i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));
 472
 473                         /* 512 bytes (2**9) is the fake blocksize that must be
 474                            used for this calculation */
 475                         inode->i_blocks = (512 - 1 + le64_to_cpu(
 476                                            pfindData->AllocationSize)) >> 9;
 477                 }
 478
 479                 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 480
 481                 /* BB fill in uid and gid here? with help from winbind?
 482                    or retrieve from NTFS stream extended attribute */
 483                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 484                         /* fill in uid, gid, mode from server ACL */
 485                         get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
 486                 } else if (atomic_read(&cifsInfo->inUse) == 0) {
 487                         inode->i_uid = cifs_sb->mnt_uid;
 488                         inode->i_gid = cifs_sb->mnt_gid;
 489                         /* set so we do not keep refreshing these fields with
 490                            bad data after user has changed them in memory */
 491                         atomic_set(&cifsInfo->inUse,1);
 492                 }
 493
 494                 if (S_ISREG(inode->i_mode)) {
 495                         cFYI(1, ("File inode"));
 496                         inode->i_op = &cifs_file_inode_ops;
 497                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 498                                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 499                                         inode->i_fop =
 500                                                 &cifs_file_direct_nobrl_ops;
 501                                 else
 502                                         inode->i_fop = &cifs_file_direct_ops;
 503                         } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 504                                 inode->i_fop = &cifs_file_nobrl_ops;
 505                         else /* not direct, send byte range locks */
 506                                 inode->i_fop = &cifs_file_ops;
 507
 508                         inode->i_data.a_ops = &cifs_addr_ops;
 509                         if(pTcon->ses->server->maxBuf <
 510                              4096 + MAX_CIFS_HDR_SIZE)
 511                                 inode->i_data.a_ops->readpages = NULL;
 512                 } else if (S_ISDIR(inode->i_mode)) {
 513                         cFYI(1, ("Directory inode"));
 514                         inode->i_op = &cifs_dir_inode_ops;
 515                         inode->i_fop = &cifs_dir_ops;
 516                 } else if (S_ISLNK(inode->i_mode)) {
 517                         cFYI(1, ("Symbolic Link inode"));
 518                         inode->i_op = &cifs_symlink_inode_ops;
 519                 } else {
 520                         init_special_inode(inode, inode->i_mode,
 521                                            inode->i_rdev);
 522                 }
 523         }
 524         kfree(buf);
 525         return rc;
 526 }
 527
 528 /* gets root inode */
 529 void cifs_read_inode(struct inode *inode)
 530 {
 531         int xid;
 532         struct cifs_sb_info *cifs_sb;
 533
 534         cifs_sb = CIFS_SB(inode->i_sb);
 535         xid = GetXid();
 536         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
 537                 cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
 538         else
 539                 cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
 540         /* can not call macro FreeXid here since in a void func */
 541         _FreeXid(xid);
 542 }
 543
 544 int cifs_unlink(struct inode *inode, struct dentry *direntry)
 545 {
 546         int rc = 0;
 547         int xid;
 548         struct cifs_sb_info *cifs_sb;
 549         struct cifsTconInfo *pTcon;
 550         char *full_path = NULL;
 551         struct cifsInodeInfo *cifsInode;
 552         FILE_BASIC_INFO *pinfo_buf;
 553
 554         cFYI(1, ("cifs_unlink, inode = 0x%p with ", inode));
 555
 556         xid = GetXid();
 557
 558         cifs_sb = CIFS_SB(inode->i_sb);
 559         pTcon = cifs_sb->tcon;
 560
 561         /* Unlink can be called from rename so we can not grab the sem here
 562            since we deadlock otherwise */
 563 /*      down(&direntry->d_sb->s_vfs_rename_sem);*/
 564         full_path = build_path_from_dentry(direntry);
 565 /*      up(&direntry->d_sb->s_vfs_rename_sem);*/
 566         if (full_path == NULL) {
 567                 FreeXid(xid);
 568                 return -ENOMEM;
 569         }
 570         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
 571                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 572
 573         if (!rc) {
 574                 if (direntry->d_inode)
 575                         direntry->d_inode->i_nlink--;
 576         } else if (rc == -ENOENT) {
 577                 d_drop(direntry);
 578         } else if (rc == -ETXTBSY) {
 579                 int oplock = FALSE;
 580                 __u16 netfid;
 581
 582                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
 583                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
 584                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
 585                                  cifs_sb->mnt_cifs_flags &
 586                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 587                 if (rc==0) {
 588                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
 589                                               cifs_sb->local_nls,
 590                                               cifs_sb->mnt_cifs_flags &
 591                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 592                         CIFSSMBClose(xid, pTcon, netfid);
 593                         if (direntry->d_inode)
 594                                 direntry->d_inode->i_nlink--;
 595                 }
 596         } else if (rc == -EACCES) {
 597                 /* try only if r/o attribute set in local lookup data? */
 598                 pinfo_buf = kmalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
 599                 if (pinfo_buf) {
 600                         memset(pinfo_buf, 0, sizeof(FILE_BASIC_INFO));
 601                         /* ATTRS set to normal clears r/o bit */
 602                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
 603                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
 604                                 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
 605                                                      pinfo_buf,
 606                                                      cifs_sb->local_nls,
 607                                                      cifs_sb->mnt_cifs_flags &
 608                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 609                         else
 610                                 rc = -EOPNOTSUPP;
 611
 612                         if (rc == -EOPNOTSUPP) {
 613                                 int oplock = FALSE;
 614                                 __u16 netfid;
 615                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
 616                                                           full_path,
 617                                                           (__u16)ATTR_NORMAL,
 618                                                           cifs_sb->local_nls);
 619                            For some strange reason it seems that NT4 eats the
 620                            old setattr call without actually setting the
 621                            attributes so on to the third attempted workaround
 622                            */
 623
 624                         /* BB could scan to see if we already have it open
 625                            and pass in pid of opener to function */
 626                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 627                                                  FILE_OPEN, SYNCHRONIZE |
 628                                                  FILE_WRITE_ATTRIBUTES, 0,
 629                                                  &netfid, &oplock, NULL,
 630                                                  cifs_sb->local_nls,
 631                                                  cifs_sb->mnt_cifs_flags &
 632                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 633                                 if (rc==0) {
 634                                         rc = CIFSSMBSetFileTimes(xid, pTcon,
 635                                                                  pinfo_buf,
 636                                                                  netfid);
 637                                         CIFSSMBClose(xid, pTcon, netfid);
 638                                 }
 639                         }
 640                         kfree(pinfo_buf);
 641                 }
 642                 if (rc==0) {
 643                         rc = CIFSSMBDelFile(xid, pTcon, full_path,
 644                                             cifs_sb->local_nls,
 645                                             cifs_sb->mnt_cifs_flags &
 646                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 647                         if (!rc) {
 648                                 if (direntry->d_inode)
 649                                         direntry->d_inode->i_nlink--;
 650                         } else if (rc == -ETXTBSY) {
 651                                 int oplock = FALSE;
 652                                 __u16 netfid;
 653
 654                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 655                                                  FILE_OPEN, DELETE,
 656                                                  CREATE_NOT_DIR |
 657                                                  CREATE_DELETE_ON_CLOSE,
 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                                         CIFSSMBRenameOpenFile(xid, pTcon,
 664                                                 netfid, NULL,
 665                                                 cifs_sb->local_nls,
 666                                                 cifs_sb->mnt_cifs_flags &
 667                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 668                                         CIFSSMBClose(xid, pTcon, netfid);
 669                                         if (direntry->d_inode)
 670                                                 direntry->d_inode->i_nlink--;
 671                                 }
 672                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
 673                         }
 674                 }
 675         }
 676         if (direntry->d_inode) {
 677                 cifsInode = CIFS_I(direntry->d_inode);
 678                 cifsInode->time = 0;    /* will force revalidate to get info
 679                                            when needed */
 680                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
 681         }
 682         inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
 683         cifsInode = CIFS_I(inode);
 684         cifsInode->time = 0;    /* force revalidate of dir as well */
 685
 686         kfree(full_path);
 687         FreeXid(xid);
 688         return rc;
 689 }
 690
 691 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 692 {
 693         int rc = 0;
 694         int xid;
 695         struct cifs_sb_info *cifs_sb;
 696         struct cifsTconInfo *pTcon;
 697         char *full_path = NULL;
 698         struct inode *newinode = NULL;
 699
 700         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p ", mode, inode));
 701
 702         xid = GetXid();
 703
 704         cifs_sb = CIFS_SB(inode->i_sb);
 705         pTcon = cifs_sb->tcon;
 706
 707         down(&inode->i_sb->s_vfs_rename_sem);
 708         full_path = build_path_from_dentry(direntry);
 709         up(&inode->i_sb->s_vfs_rename_sem);
 710         if (full_path == NULL) {
 711                 FreeXid(xid);
 712                 return -ENOMEM;
 713         }
 714         /* BB add setting the equivalent of mode via CreateX w/ACLs */
 715         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
 716                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 717         if (rc) {
 718                 cFYI(1, ("cifs_mkdir returned 0x%x ", rc));
 719                 d_drop(direntry);
 720         } else {
 721                 inode->i_nlink++;
 722                 if (pTcon->ses->capabilities & CAP_UNIX)
 723                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 724                                                       inode->i_sb,xid);
 725                 else
 726                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 727                                                  inode->i_sb,xid);
 728
 729                 if (pTcon->nocase)
 730                         direntry->d_op = &cifs_ci_dentry_ops;
 731                 else
 732                         direntry->d_op = &cifs_dentry_ops;
 733                 d_instantiate(direntry, newinode);
 734                 if (direntry->d_inode)
 735                         direntry->d_inode->i_nlink = 2;
 736                 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
 737                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 738                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 739                                                     mode,
 740                                                     (__u64)current->euid,
 741                                                     (__u64)current->egid,
 742                                                     0 /* dev_t */,
 743                                                     cifs_sb->local_nls,
 744                                                     cifs_sb->mnt_cifs_flags &
 745                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 746                         } else {
 747                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 748                                                     mode, (__u64)-1,
 749                                                     (__u64)-1, 0 /* dev_t */,
 750                                                     cifs_sb->local_nls,
 751                                                     cifs_sb->mnt_cifs_flags &
 752                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 753                         }
 754                 else {
 755                         /* BB to be implemented via Windows secrty descriptors
 756                            eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
 757                                                  -1, -1, local_nls); */
 758                 }
 759         }
 760         kfree(full_path);
 761         FreeXid(xid);
 762         return rc;
 763 }
 764
 765 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 766 {
 767         int rc = 0;
 768         int xid;
 769         struct cifs_sb_info *cifs_sb;
 770         struct cifsTconInfo *pTcon;
 771         char *full_path = NULL;
 772         struct cifsInodeInfo *cifsInode;
 773
 774         cFYI(1, ("cifs_rmdir, inode = 0x%p with ", inode));
 775
 776         xid = GetXid();
 777
 778         cifs_sb = CIFS_SB(inode->i_sb);
 779         pTcon = cifs_sb->tcon;
 780
 781         down(&inode->i_sb->s_vfs_rename_sem);
 782         full_path = build_path_from_dentry(direntry);
 783         up(&inode->i_sb->s_vfs_rename_sem);
 784         if (full_path == NULL) {
 785                 FreeXid(xid);
 786                 return -ENOMEM;
 787         }
 788
 789         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
 790                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 791
 792         if (!rc) {
 793                 inode->i_nlink--;
 794                 i_size_write(direntry->d_inode,0);
 795                 direntry->d_inode->i_nlink = 0;
 796         }
 797
 798         cifsInode = CIFS_I(direntry->d_inode);
 799         cifsInode->time = 0;    /* force revalidate to go get info when
 800                                    needed */
 801         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
 802                 current_fs_time(inode->i_sb);
 803
 804         kfree(full_path);
 805         FreeXid(xid);
 806         return rc;
 807 }
 808
 809 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
 810         struct inode *target_inode, struct dentry *target_direntry)
 811 {
 812         char *fromName;
 813         char *toName;
 814         struct cifs_sb_info *cifs_sb_source;
 815         struct cifs_sb_info *cifs_sb_target;
 816         struct cifsTconInfo *pTcon;
 817         int xid;
 818         int rc = 0;
 819
 820         xid = GetXid();
 821
 822         cifs_sb_target = CIFS_SB(target_inode->i_sb);
 823         cifs_sb_source = CIFS_SB(source_inode->i_sb);
 824         pTcon = cifs_sb_source->tcon;
 825
 826         if (pTcon != cifs_sb_target->tcon) {
 827                 FreeXid(xid);
 828                 return -EXDEV;  /* BB actually could be allowed if same server,
 829                                    but different share.
 830                                    Might eventually add support for this */
 831         }
 832
 833         /* we already  have the rename sem so we do not need to grab it again
 834            here to protect the path integrity */
 835         fromName = build_path_from_dentry(source_direntry);
 836         toName = build_path_from_dentry(target_direntry);
 837         if ((fromName == NULL) || (toName == NULL)) {
 838                 rc = -ENOMEM;
 839                 goto cifs_rename_exit;
 840         }
 841
 842         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
 843                            cifs_sb_source->local_nls,
 844                            cifs_sb_source->mnt_cifs_flags &
 845                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 846         if (rc == -EEXIST) {
 847                 /* check if they are the same file because rename of hardlinked
 848                    files is a noop */
 849                 FILE_UNIX_BASIC_INFO *info_buf_source;
 850                 FILE_UNIX_BASIC_INFO *info_buf_target;
 851
 852                 info_buf_source =
 853                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 854                 if (info_buf_source != NULL) {
 855                         info_buf_target = info_buf_source + 1;
 856                         rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
 857                                 info_buf_source, cifs_sb_source->local_nls,
 858                                 cifs_sb_source->mnt_cifs_flags &
 859                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 860                         if (rc == 0) {
 861                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
 862                                                 info_buf_target,
 863                                                 cifs_sb_target->local_nls,
 864                                                 /* remap based on source sb */
 865                                                 cifs_sb_source->mnt_cifs_flags &
 866                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 867                         }
 868                         if ((rc == 0) &&
 869                             (info_buf_source->UniqueId ==
 870                              info_buf_target->UniqueId)) {
 871                         /* do not rename since the files are hardlinked which
 872                            is a noop */
 873                         } else {
 874                         /* we either can not tell the files are hardlinked
 875                            (as with Windows servers) or files are not
 876                            hardlinked so delete the target manually before
 877                            renaming to follow POSIX rather than Windows
 878                            semantics */
 879                                 cifs_unlink(target_inode, target_direntry);
 880                                 rc = CIFSSMBRename(xid, pTcon, fromName,
 881                                                    toName,
 882                                                    cifs_sb_source->local_nls,
 883                                                    cifs_sb_source->mnt_cifs_flags
 884                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
 885                         }
 886                         kfree(info_buf_source);
 887                 } /* if we can not get memory just leave rc as EEXIST */
 888         }
 889
 890         if (rc) {
 891                 cFYI(1, ("rename rc %d", rc));
 892         }
 893
 894         if ((rc == -EIO) || (rc == -EEXIST)) {
 895                 int oplock = FALSE;
 896                 __u16 netfid;
 897
 898                 /* BB FIXME Is Generic Read correct for rename? */
 899                 /* if renaming directory - we should not say CREATE_NOT_DIR,
 900                    need to test renaming open directory, also GENERIC_READ
 901                    might not right be right access to request */
 902                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
 903                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
 904                                  cifs_sb_source->local_nls,
 905                                  cifs_sb_source->mnt_cifs_flags &
 906                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 907                 if (rc==0) {
 908                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
 909                                               cifs_sb_source->local_nls,
 910                                               cifs_sb_source->mnt_cifs_flags &
 911                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 912                         CIFSSMBClose(xid, pTcon, netfid);
 913                 }
 914         }
 915
 916 cifs_rename_exit:
 917         kfree(fromName);
 918         kfree(toName);
 919         FreeXid(xid);
 920         return rc;
 921 }
 922
 923 int cifs_revalidate(struct dentry *direntry)
 924 {
 925         int xid;
 926         int rc = 0;
 927         char *full_path;
 928         struct cifs_sb_info *cifs_sb;
 929         struct cifsInodeInfo *cifsInode;
 930         loff_t local_size;
 931         struct timespec local_mtime;
 932         int invalidate_inode = FALSE;
 933
 934         if (direntry->d_inode == NULL)
 935                 return -ENOENT;
 936
 937         cifsInode = CIFS_I(direntry->d_inode);
 938
 939         if (cifsInode == NULL)
 940                 return -ENOENT;
 941
 942         /* no sense revalidating inode info on file that no one can write */
 943         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
 944                 return rc;
 945
 946         xid = GetXid();
 947
 948         cifs_sb = CIFS_SB(direntry->d_sb);
 949
 950         /* can not safely grab the rename sem here if rename calls revalidate
 951            since that would deadlock */
 952         full_path = build_path_from_dentry(direntry);
 953         if (full_path == NULL) {
 954                 FreeXid(xid);
 955                 return -ENOMEM;
 956         }
 957         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
 958                  "jiffies %ld", full_path, direntry->d_inode,
 959                  direntry->d_inode->i_count.counter, direntry,
 960                  direntry->d_time, jiffies));
 961
 962         if (cifsInode->time == 0) {
 963                 /* was set to zero previously to force revalidate */
 964         } else if (time_before(jiffies, cifsInode->time + HZ) &&
 965                    lookupCacheEnabled) {
 966                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
 967                     (direntry->d_inode->i_nlink == 1)) {
 968                         kfree(full_path);
 969                         FreeXid(xid);
 970                         return rc;
 971                 } else {
 972                         cFYI(1, ("Have to revalidate file due to hardlinks"));
 973                 }
 974         }
 975
 976         /* save mtime and size */
 977         local_mtime = direntry->d_inode->i_mtime;
 978         local_size = direntry->d_inode->i_size;
 979
 980         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
 981                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
 982                                               direntry->d_sb,xid);
 983                 if (rc) {
 984                         cFYI(1, ("error on getting revalidate info %d", rc));
 985 /*                      if (rc != -ENOENT)
 986                                 rc = 0; */      /* BB should we cache info on
 987                                                    certain errors? */
 988                 }
 989         } else {
 990                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
 991                                          direntry->d_sb,xid);
 992                 if (rc) {
 993                         cFYI(1, ("error on getting revalidate info %d", rc));
 994 /*                      if (rc != -ENOENT)
 995                                 rc = 0; */      /* BB should we cache info on
 996                                                    certain errors? */
 997                 }
 998         }
 999         /* should we remap certain errors, access denied?, to zero */
1000
1001         /* if not oplocked, we invalidate inode pages if mtime or file size
1002            had changed on server */
1003
1004         if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) &&
1005             (local_size == direntry->d_inode->i_size)) {
1006                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1007         } else {
1008                 /* file may have changed on server */
1009                 if (cifsInode->clientCanCacheRead) {
1010                         /* no need to invalidate inode pages since we were the
1011                            only ones who could have modified the file and the
1012                            server copy is staler than ours */
1013                 } else {
1014                         invalidate_inode = TRUE;
1015                 }
1016         }
1017
1018         /* can not grab this sem since kernel filesys locking documentation
1019            indicates i_sem may be taken by the kernel on lookup and rename
1020            which could deadlock if we grab the i_sem here as well */
1021 /*      down(&direntry->d_inode->i_sem);*/
1022         /* need to write out dirty pages here  */
1023         if (direntry->d_inode->i_mapping) {
1024                 /* do we need to lock inode until after invalidate completes
1025                    below? */
1026                 filemap_fdatawrite(direntry->d_inode->i_mapping);
1027         }
1028         if (invalidate_inode) {
1029                 if (direntry->d_inode->i_mapping)
1030                         filemap_fdatawait(direntry->d_inode->i_mapping);
1031                 /* may eventually have to do this for open files too */
1032                 if (list_empty(&(cifsInode->openFileList))) {
1033                         /* Has changed on server - flush read ahead pages */
1034                         cFYI(1, ("Invalidating read ahead data on "
1035                                  "closed file"));
1036                         invalidate_remote_inode(direntry->d_inode);
1037                 }
1038         }
1039 /*      up(&direntry->d_inode->i_sem); */
1040
1041         kfree(full_path);
1042         FreeXid(xid);
1043         return rc;
1044 }
1045
1046 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1047         struct kstat *stat)
1048 {
1049         int err = cifs_revalidate(dentry);
1050         if (!err)
1051                 generic_fillattr(dentry->d_inode, stat);
1052         return err;
1053 }
1054
1055 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1056 {
1057         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1058         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1059         struct page *page;
1060         char *kaddr;
1061         int rc = 0;
1062
1063         page = grab_cache_page(mapping, index);
1064         if (!page)
1065                 return -ENOMEM;
1066
1067         kaddr = kmap_atomic(page, KM_USER0);
1068         memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1069         flush_dcache_page(page);
1070         kunmap_atomic(kaddr, KM_USER0);
1071         unlock_page(page);
1072         page_cache_release(page);
1073         return rc;
1074 }
1075
1076 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1077 {
1078         int xid;
1079         struct cifs_sb_info *cifs_sb;
1080         struct cifsTconInfo *pTcon;
1081         char *full_path = NULL;
1082         int rc = -EACCES;
1083         struct cifsFileInfo *open_file = NULL;
1084         FILE_BASIC_INFO time_buf;
1085         int set_time = FALSE;
1086         __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1087         __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1088         __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1089         struct cifsInodeInfo *cifsInode;
1090
1091         xid = GetXid();
1092
1093         cFYI(1, ("In cifs_setattr, name = %s attrs->iavalid 0x%x ",
1094                  direntry->d_name.name, attrs->ia_valid));
1095         cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1096         pTcon = cifs_sb->tcon;
1097
1098         down(&direntry->d_sb->s_vfs_rename_sem);
1099         full_path = build_path_from_dentry(direntry);
1100         up(&direntry->d_sb->s_vfs_rename_sem);
1101         if (full_path == NULL) {
1102                 FreeXid(xid);
1103                 return -ENOMEM;
1104         }
1105         cifsInode = CIFS_I(direntry->d_inode);
1106
1107         /* BB check if we need to refresh inode from server now ? BB */
1108
1109         /* need to flush data before changing file size on server */
1110         filemap_fdatawrite(direntry->d_inode->i_mapping);
1111         filemap_fdatawait(direntry->d_inode->i_mapping);
1112
1113         if (attrs->ia_valid & ATTR_SIZE) {
1114                 /* To avoid spurious oplock breaks from server, in the case of
1115                    inodes that we already have open, avoid doing path based
1116                    setting of file size if we can do it by handle.
1117                    This keeps our caching token (oplock) and avoids timeouts
1118                    when the local oplock break takes longer to flush
1119                    writebehind data than the SMB timeout for the SetPathInfo
1120                    request would allow */
1121                 open_file = find_writable_file(cifsInode);
1122                 if (open_file) {
1123                         __u16 nfid = open_file->netfid;
1124                         __u32 npid = open_file->pid;
1125                         rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1126                                                 nfid, npid, FALSE);
1127                         atomic_dec(&open_file->wrtPending);
1128                         cFYI(1,("SetFSize for attrs rc = %d", rc));
1129                         if(rc == -EINVAL) {
1130                                 int bytes_written;
1131                                 rc = CIFSSMBWrite(xid, pTcon,
1132                                                   nfid, 0, attrs->ia_size,
1133                                                   &bytes_written, NULL, NULL,
1134                                                   1 /* 45 seconds */);
1135                                 cFYI(1,("Wrt seteof rc %d", rc));
1136                         }
1137                 }
1138                 if (rc != 0) {
1139                         /* Set file size by pathname rather than by handle
1140                            either because no valid, writeable file handle for
1141                            it was found or because there was an error setting
1142                            it by handle */
1143                         rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1144                                            attrs->ia_size, FALSE,
1145                                            cifs_sb->local_nls,
1146                                            cifs_sb->mnt_cifs_flags &
1147                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1148                         cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1149                         if(rc == -EINVAL) {
1150                                 __u16 netfid;
1151                                 int oplock = FALSE;
1152
1153                                 rc = SMBLegacyOpen(xid, pTcon, full_path,
1154                                         FILE_OPEN,
1155                                         SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1156                                         CREATE_NOT_DIR, &netfid, &oplock,
1157                                         NULL, cifs_sb->local_nls,
1158                                         cifs_sb->mnt_cifs_flags &
1159                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1160                                 if (rc==0) {
1161                                         int bytes_written;
1162                                         rc = CIFSSMBWrite(xid, pTcon,
1163                                                         netfid, 0,
1164                                                         attrs->ia_size,
1165                                                         &bytes_written, NULL,
1166                                                         NULL, 1 /* 45 sec */);
1167                                         cFYI(1,("wrt seteof rc %d",rc));
1168                                         CIFSSMBClose(xid, pTcon, netfid);
1169                                 }
1170
1171                         }
1172                 }
1173
1174                 /* Server is ok setting allocation size implicitly - no need
1175                    to call:
1176                 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1177                          cifs_sb->local_nls);
1178                    */
1179
1180                 if (rc == 0) {
1181                         rc = vmtruncate(direntry->d_inode, attrs->ia_size);
1182                         cifs_truncate_page(direntry->d_inode->i_mapping,
1183                                            direntry->d_inode->i_size);
1184                 } else
1185                         goto cifs_setattr_exit;
1186         }
1187         if (attrs->ia_valid & ATTR_UID) {
1188                 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1189                 uid = attrs->ia_uid;
1190         }
1191         if (attrs->ia_valid & ATTR_GID) {
1192                 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1193                 gid = attrs->ia_gid;
1194         }
1195
1196         time_buf.Attributes = 0;
1197         if (attrs->ia_valid & ATTR_MODE) {
1198                 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1199                 mode = attrs->ia_mode;
1200         }
1201
1202         if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1203             && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1204                 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1205                                          0 /* dev_t */, cifs_sb->local_nls,
1206                                          cifs_sb->mnt_cifs_flags &
1207                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1208         else if (attrs->ia_valid & ATTR_MODE) {
1209                 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1210                         if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0)
1211                                 time_buf.Attributes =
1212                                         cpu_to_le32(cifsInode->cifsAttrs |
1213                                                     ATTR_READONLY);
1214                 } else if ((mode & S_IWUGO) == S_IWUGO) {
1215                         if (cifsInode->cifsAttrs & ATTR_READONLY)
1216                                 time_buf.Attributes =
1217                                         cpu_to_le32(cifsInode->cifsAttrs &
1218                                                     (~ATTR_READONLY));
1219                 }
1220                 /* BB to be implemented -
1221                    via Windows security descriptors or streams */
1222                 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1223                                       cifs_sb->local_nls); */
1224         }
1225
1226         if (attrs->ia_valid & ATTR_ATIME) {
1227                 set_time = TRUE;
1228                 time_buf.LastAccessTime =
1229                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1230         } else
1231                 time_buf.LastAccessTime = 0;
1232
1233         if (attrs->ia_valid & ATTR_MTIME) {
1234                 set_time = TRUE;
1235                 time_buf.LastWriteTime =
1236                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1237         } else
1238                 time_buf.LastWriteTime = 0;
1239         /* Do not set ctime explicitly unless other time
1240            stamps are changed explicitly (i.e. by utime()
1241            since we would then have a mix of client and
1242            server times */
1243
1244         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1245                 set_time = TRUE;
1246                 /* Although Samba throws this field away
1247                 it may be useful to Windows - but we do
1248                 not want to set ctime unless some other
1249                 timestamp is changing */
1250                 cFYI(1, ("CIFS - CTIME changed "));
1251                 time_buf.ChangeTime =
1252                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1253         } else
1254                 time_buf.ChangeTime = 0;
1255
1256         if (set_time || time_buf.Attributes) {
1257                 time_buf.CreationTime = 0;      /* do not change */
1258                 /* In the future we should experiment - try setting timestamps
1259                    via Handle (SetFileInfo) instead of by path */
1260                 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1261                         rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1262                                              cifs_sb->local_nls,
1263                                              cifs_sb->mnt_cifs_flags &
1264                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1265                 else
1266                         rc = -EOPNOTSUPP;
1267
1268                 if (rc == -EOPNOTSUPP) {
1269                         int oplock = FALSE;
1270                         __u16 netfid;
1271
1272                         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1273                                  "times not supported by this server"));
1274                         /* BB we could scan to see if we already have it open
1275                            and pass in pid of opener to function */
1276                         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1277                                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1278                                          CREATE_NOT_DIR, &netfid, &oplock,
1279                                          NULL, cifs_sb->local_nls,
1280                                          cifs_sb->mnt_cifs_flags &
1281                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1282                         if (rc==0) {
1283                                 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1284                                                          netfid);
1285                                 CIFSSMBClose(xid, pTcon, netfid);
1286                         } else {
1287                         /* BB For even older servers we could convert time_buf
1288                            into old DOS style which uses two second
1289                            granularity */
1290
1291                         /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1292                                         &time_buf, cifs_sb->local_nls); */
1293                         }
1294                 }
1295                 /* Even if error on time set, no sense failing the call if
1296                 the server would set the time to a reasonable value anyway,
1297                 and this check ensures that we are not being called from
1298                 sys_utimes in which case we ought to fail the call back to
1299                 the user when the server rejects the call */
1300                 if((rc) && (attrs->ia_valid &&
1301                          (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1302                         rc = 0;
1303         }
1304
1305         /* do not need local check to inode_check_ok since the server does
1306            that */
1307         if (!rc)
1308                 rc = inode_setattr(direntry->d_inode, attrs);
1309 cifs_setattr_exit:
1310         kfree(full_path);
1311         FreeXid(xid);
1312         return rc;
1313 }
1314
1315 void cifs_delete_inode(struct inode *inode)
1316 {
1317         cFYI(1, ("In cifs_delete_inode, inode = 0x%p ", inode));
1318         /* may have to add back in if and when safe distributed caching of
1319            directories added e.g. via FindNotify */
1320 }