fs/cifs/inode.c

   1 /*
   2  *   fs/cifs/inode.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2007
   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
  33 static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
  34 {
  35         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  36
  37         switch (inode->i_mode & S_IFMT) {
  38         case S_IFREG:
  39                 inode->i_op = &cifs_file_inode_ops;
  40                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
  41                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  42                                 inode->i_fop = &cifs_file_direct_nobrl_ops;
  43                         else
  44                                 inode->i_fop = &cifs_file_direct_ops;
  45                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  46                         inode->i_fop = &cifs_file_nobrl_ops;
  47                 else { /* not direct, send byte range locks */
  48                         inode->i_fop = &cifs_file_ops;
  49                 }
  50
  51
  52                 /* check if server can support readpages */
  53                 if (cifs_sb->tcon->ses->server->maxBuf <
  54                                 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
  55                         inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
  56                 else
  57                         inode->i_data.a_ops = &cifs_addr_ops;
  58                 break;
  59         case S_IFDIR:
  60 #ifdef CONFIG_CIFS_DFS_UPCALL
  61                 if (is_dfs_referral) {
  62                         inode->i_op = &cifs_dfs_referral_inode_operations;
  63                 } else {
  64 #else /* NO DFS support, treat as a directory */
  65                 {
  66 #endif
  67                         inode->i_op = &cifs_dir_inode_ops;
  68                         inode->i_fop = &cifs_dir_ops;
  69                 }
  70                 break;
  71         case S_IFLNK:
  72                 inode->i_op = &cifs_symlink_inode_ops;
  73                 break;
  74         default:
  75                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  76                 break;
  77         }
  78 }
  79
  80 static void cifs_unix_info_to_inode(struct inode *inode,
  81                 FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
  82 {
  83         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  84         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
  85         __u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
  86         __u64 end_of_file = le64_to_cpu(info->EndOfFile);
  87
  88         inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(info->LastAccessTime));
  89         inode->i_mtime =
  90                 cifs_NTtimeToUnix(le64_to_cpu(info->LastModificationTime));
  91         inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(info->LastStatusChange));
  92         inode->i_mode = le64_to_cpu(info->Permissions);
  93
  94         /*
  95          * Since we set the inode type below we need to mask off
  96          * to avoid strange results if bits set above.
  97          */
  98         inode->i_mode &= ~S_IFMT;
  99         switch (le32_to_cpu(info->Type)) {
 100         case UNIX_FILE:
 101                 inode->i_mode |= S_IFREG;
 102                 break;
 103         case UNIX_SYMLINK:
 104                 inode->i_mode |= S_IFLNK;
 105                 break;
 106         case UNIX_DIR:
 107                 inode->i_mode |= S_IFDIR;
 108                 break;
 109         case UNIX_CHARDEV:
 110                 inode->i_mode |= S_IFCHR;
 111                 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 112                                       le64_to_cpu(info->DevMinor) & MINORMASK);
 113                 break;
 114         case UNIX_BLOCKDEV:
 115                 inode->i_mode |= S_IFBLK;
 116                 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 117                                       le64_to_cpu(info->DevMinor) & MINORMASK);
 118                 break;
 119         case UNIX_FIFO:
 120                 inode->i_mode |= S_IFIFO;
 121                 break;
 122         case UNIX_SOCKET:
 123                 inode->i_mode |= S_IFSOCK;
 124                 break;
 125         default:
 126                 /* safest to call it a file if we do not know */
 127                 inode->i_mode |= S_IFREG;
 128                 cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
 129                 break;
 130         }
 131
 132         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
 133             !force_uid_gid)
 134                 inode->i_uid = cifs_sb->mnt_uid;
 135         else
 136                 inode->i_uid = le64_to_cpu(info->Uid);
 137
 138         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
 139             !force_uid_gid)
 140                 inode->i_gid = cifs_sb->mnt_gid;
 141         else
 142                 inode->i_gid = le64_to_cpu(info->Gid);
 143
 144         inode->i_nlink = le64_to_cpu(info->Nlinks);
 145
 146         spin_lock(&inode->i_lock);
 147         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
 148                 /*
 149                  * We can not safely change the file size here if the client
 150                  * is writing to it due to potential races.
 151                  */
 152                 i_size_write(inode, end_of_file);
 153
 154                 /*
 155                  * i_blocks is not related to (i_size / i_blksize),
 156                  * but instead 512 byte (2**9) size is required for
 157                  * calculating num blocks.
 158                  */
 159                 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 160         }
 161         spin_unlock(&inode->i_lock);
 162 }
 163
 164 int cifs_get_inode_info_unix(struct inode **pinode,
 165         const unsigned char *full_path, struct super_block *sb, int xid)
 166 {
 167         int rc = 0;
 168         FILE_UNIX_BASIC_INFO findData;
 169         struct cifsTconInfo *pTcon;
 170         struct inode *inode;
 171         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 172         bool is_dfs_referral = false;
 173
 174         pTcon = cifs_sb->tcon;
 175         cFYI(1, ("Getting info on %s", full_path));
 176
 177 try_again_CIFSSMBUnixQPathInfo:
 178         /* could have done a find first instead but this returns more info */
 179         rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &findData,
 180                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 181                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 182 /*      dump_mem("\nUnixQPathInfo return data", &findData,
 183                  sizeof(findData)); */
 184         if (rc) {
 185                 if (rc == -EREMOTE && !is_dfs_referral) {
 186                         is_dfs_referral = true;
 187                         goto try_again_CIFSSMBUnixQPathInfo;
 188                 }
 189                 goto cgiiu_exit;
 190         } else {
 191                 struct cifsInodeInfo *cifsInfo;
 192                 __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
 193                 __u64 end_of_file = le64_to_cpu(findData.EndOfFile);
 194
 195                 /* get new inode */
 196                 if (*pinode == NULL) {
 197                         *pinode = new_inode(sb);
 198                         if (*pinode == NULL) {
 199                                 rc = -ENOMEM;
 200                                 goto cgiiu_exit;
 201                         }
 202                         /* Is an i_ino of zero legal? */
 203                         /* Are there sanity checks we can use to ensure that
 204                            the server is really filling in that field? */
 205                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 206                                 (*pinode)->i_ino =
 207                                         (unsigned long)findData.UniqueId;
 208                         } /* note ino incremented to unique num in new_inode */
 209                         if (sb->s_flags & MS_NOATIME)
 210                                 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
 211
 212                         insert_inode_hash(*pinode);
 213                 }
 214
 215                 inode = *pinode;
 216                 cifsInfo = CIFS_I(inode);
 217
 218                 cFYI(1, ("Old time %ld", cifsInfo->time));
 219                 cifsInfo->time = jiffies;
 220                 cFYI(1, ("New time %ld", cifsInfo->time));
 221                 /* this is ok to set on every inode revalidate */
 222                 atomic_set(&cifsInfo->inUse, 1);
 223
 224                 cifs_unix_info_to_inode(inode, &findData, 0);
 225
 226
 227                 if (num_of_bytes < end_of_file)
 228                         cFYI(1, ("allocation size less than end of file"));
 229                 cFYI(1, ("Size %ld and blocks %llu",
 230                         (unsigned long) inode->i_size,
 231                         (unsigned long long)inode->i_blocks));
 232
 233                 cifs_set_ops(inode, is_dfs_referral);
 234         }
 235 cgiiu_exit:
 236         return rc;
 237 }
 238
 239 static int decode_sfu_inode(struct inode *inode, __u64 size,
 240                             const unsigned char *path,
 241                             struct cifs_sb_info *cifs_sb, int xid)
 242 {
 243         int rc;
 244         int oplock = 0;
 245         __u16 netfid;
 246         struct cifsTconInfo *pTcon = cifs_sb->tcon;
 247         char buf[24];
 248         unsigned int bytes_read;
 249         char *pbuf;
 250
 251         pbuf = buf;
 252
 253         if (size == 0) {
 254                 inode->i_mode |= S_IFIFO;
 255                 return 0;
 256         } else if (size < 8) {
 257                 return -EINVAL;  /* EOPNOTSUPP? */
 258         }
 259
 260         rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
 261                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 262                          cifs_sb->local_nls,
 263                          cifs_sb->mnt_cifs_flags &
 264                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 265         if (rc == 0) {
 266                 int buf_type = CIFS_NO_BUFFER;
 267                         /* Read header */
 268                 rc = CIFSSMBRead(xid, pTcon,
 269                                  netfid,
 270                                  24 /* length */, 0 /* offset */,
 271                                  &bytes_read, &pbuf, &buf_type);
 272                 if ((rc == 0) && (bytes_read >= 8)) {
 273                         if (memcmp("IntxBLK", pbuf, 8) == 0) {
 274                                 cFYI(1, ("Block device"));
 275                                 inode->i_mode |= S_IFBLK;
 276                                 if (bytes_read == 24) {
 277                                         /* we have enough to decode dev num */
 278                                         __u64 mjr; /* major */
 279                                         __u64 mnr; /* minor */
 280                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 281                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 282                                         inode->i_rdev = MKDEV(mjr, mnr);
 283                                 }
 284                         } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
 285                                 cFYI(1, ("Char device"));
 286                                 inode->i_mode |= S_IFCHR;
 287                                 if (bytes_read == 24) {
 288                                         /* we have enough to decode dev num */
 289                                         __u64 mjr; /* major */
 290                                         __u64 mnr; /* minor */
 291                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 292                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 293                                         inode->i_rdev = MKDEV(mjr, mnr);
 294                                 }
 295                         } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
 296                                 cFYI(1, ("Symlink"));
 297                                 inode->i_mode |= S_IFLNK;
 298                         } else {
 299                                 inode->i_mode |= S_IFREG; /* file? */
 300                                 rc = -EOPNOTSUPP;
 301                         }
 302                 } else {
 303                         inode->i_mode |= S_IFREG; /* then it is a file */
 304                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 305                 }
 306                 CIFSSMBClose(xid, pTcon, netfid);
 307         }
 308         return rc;
 309 }
 310
 311 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 312
 313 static int get_sfu_mode(struct inode *inode,
 314                         const unsigned char *path,
 315                         struct cifs_sb_info *cifs_sb, int xid)
 316 {
 317 #ifdef CONFIG_CIFS_XATTR
 318         ssize_t rc;
 319         char ea_value[4];
 320         __u32 mode;
 321
 322         rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
 323                         ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 324                 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 325         if (rc < 0)
 326                 return (int)rc;
 327         else if (rc > 3) {
 328                 mode = le32_to_cpu(*((__le32 *)ea_value));
 329                 inode->i_mode &= ~SFBITS_MASK;
 330                 cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
 331                 inode->i_mode = (mode &  SFBITS_MASK) | inode->i_mode;
 332                 cFYI(1, ("special mode bits 0%o", mode));
 333                 return 0;
 334         } else {
 335                 return 0;
 336         }
 337 #else
 338         return -EOPNOTSUPP;
 339 #endif
 340 }
 341
 342 int cifs_get_inode_info(struct inode **pinode,
 343         const unsigned char *full_path, FILE_ALL_INFO *pfindData,
 344         struct super_block *sb, int xid, const __u16 *pfid)
 345 {
 346         int rc = 0;
 347         struct cifsTconInfo *pTcon;
 348         struct inode *inode;
 349         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 350         char *buf = NULL;
 351         bool adjustTZ = false;
 352         bool is_dfs_referral = false;
 353
 354         pTcon = cifs_sb->tcon;
 355         cFYI(1, ("Getting info on %s", full_path));
 356
 357         if ((pfindData == NULL) && (*pinode != NULL)) {
 358                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 359                         cFYI(1, ("No need to revalidate cached inode sizes"));
 360                         return rc;
 361                 }
 362         }
 363
 364         /* if file info not passed in then get it from server */
 365         if (pfindData == NULL) {
 366                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 367                 if (buf == NULL)
 368                         return -ENOMEM;
 369                 pfindData = (FILE_ALL_INFO *)buf;
 370
 371 try_again_CIFSSMBQPathInfo:
 372                 /* could do find first instead but this returns more info */
 373                 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
 374                               0 /* not legacy */,
 375                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 376                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 377                 /* BB optimize code so we do not make the above call
 378                 when server claims no NT SMB support and the above call
 379                 failed at least once - set flag in tcon or mount */
 380                 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 381                         rc = SMBQueryInformation(xid, pTcon, full_path,
 382                                         pfindData, cifs_sb->local_nls,
 383                                         cifs_sb->mnt_cifs_flags &
 384                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 385                         adjustTZ = true;
 386                 }
 387         }
 388         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
 389         if (rc) {
 390                 if (rc == -EREMOTE && !is_dfs_referral) {
 391                         is_dfs_referral = true;
 392                         goto try_again_CIFSSMBQPathInfo;
 393                 }
 394                 goto cgii_exit;
 395         } else {
 396                 struct cifsInodeInfo *cifsInfo;
 397                 __u32 attr = le32_to_cpu(pfindData->Attributes);
 398
 399                 /* get new inode */
 400                 if (*pinode == NULL) {
 401                         *pinode = new_inode(sb);
 402                         if (*pinode == NULL) {
 403                                 rc = -ENOMEM;
 404                                 goto cgii_exit;
 405                         }
 406                         /* Is an i_ino of zero legal? Can we use that to check
 407                            if the server supports returning inode numbers?  Are
 408                            there other sanity checks we can use to ensure that
 409                            the server is really filling in that field? */
 410
 411                         /* We can not use the IndexNumber field by default from
 412                            Windows or Samba (in ALL_INFO buf) but we can request
 413                            it explicitly.  It may not be unique presumably if
 414                            the server has multiple devices mounted under one
 415                            share */
 416
 417                         /* There may be higher info levels that work but are
 418                            there Windows server or network appliances for which
 419                            IndexNumber field is not guaranteed unique? */
 420
 421                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 422                                 int rc1 = 0;
 423                                 __u64 inode_num;
 424
 425                                 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 426                                         full_path, &inode_num,
 427                                         cifs_sb->local_nls,
 428                                         cifs_sb->mnt_cifs_flags &
 429                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 430                                 if (rc1) {
 431                                         cFYI(1, ("GetSrvInodeNum rc %d", rc1));
 432                                         /* BB EOPNOSUPP disable SERVER_INUM? */
 433                                 } else /* do we need cast or hash to ino? */
 434                                         (*pinode)->i_ino = inode_num;
 435                         } /* else ino incremented to unique num in new_inode*/
 436                         if (sb->s_flags & MS_NOATIME)
 437                                 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
 438                         insert_inode_hash(*pinode);
 439                 }
 440                 inode = *pinode;
 441                 cifsInfo = CIFS_I(inode);
 442                 cifsInfo->cifsAttrs = attr;
 443                 cFYI(1, ("Old time %ld", cifsInfo->time));
 444                 cifsInfo->time = jiffies;
 445                 cFYI(1, ("New time %ld", cifsInfo->time));
 446
 447                 /* blksize needs to be multiple of two. So safer to default to
 448                 blksize and blkbits set in superblock so 2**blkbits and blksize
 449                 will match rather than setting to:
 450                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
 451
 452                 /* Linux can not store file creation time so ignore it */
 453                 if (pfindData->LastAccessTime)
 454                         inode->i_atime = cifs_NTtimeToUnix
 455                                 (le64_to_cpu(pfindData->LastAccessTime));
 456                 else /* do not need to use current_fs_time - time not stored */
 457                         inode->i_atime = CURRENT_TIME;
 458                 inode->i_mtime =
 459                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 460                 inode->i_ctime =
 461                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 462                 cFYI(0, ("Attributes came in as 0x%x", attr));
 463                 if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
 464                         inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
 465                         inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
 466                 }
 467
 468                 /* set default mode. will override for dirs below */
 469                 if (atomic_read(&cifsInfo->inUse) == 0)
 470                         /* new inode, can safely set these fields */
 471                         inode->i_mode = cifs_sb->mnt_file_mode;
 472                 else /* since we set the inode type below we need to mask off
 473                      to avoid strange results if type changes and both
 474                      get orred in */
 475                         inode->i_mode &= ~S_IFMT;
 476 /*              if (attr & ATTR_REPARSE)  */
 477                 /* We no longer handle these as symlinks because we could not
 478                    follow them due to the absolute path with drive letter */
 479                 if (attr & ATTR_DIRECTORY) {
 480                 /* override default perms since we do not do byte range locking
 481                    on dirs */
 482                         inode->i_mode = cifs_sb->mnt_dir_mode;
 483                         inode->i_mode |= S_IFDIR;
 484                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 485                            (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
 486                            /* No need to le64 convert size of zero */
 487                            (pfindData->EndOfFile == 0)) {
 488                         inode->i_mode = cifs_sb->mnt_file_mode;
 489                         inode->i_mode |= S_IFIFO;
 490 /* BB Finish for SFU style symlinks and devices */
 491                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 492                            (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
 493                         if (decode_sfu_inode(inode,
 494                                          le64_to_cpu(pfindData->EndOfFile),
 495                                          full_path,
 496                                          cifs_sb, xid))
 497                                 cFYI(1, ("Unrecognized sfu inode type"));
 498
 499                         cFYI(1, ("sfu mode 0%o", inode->i_mode));
 500                 } else {
 501                         inode->i_mode |= S_IFREG;
 502                         /* treat the dos attribute of read-only as read-only
 503                            mode e.g. 555 */
 504                         if (cifsInfo->cifsAttrs & ATTR_READONLY)
 505                                 inode->i_mode &= ~(S_IWUGO);
 506                         else if ((inode->i_mode & S_IWUGO) == 0)
 507                                 /* the ATTR_READONLY flag may have been */
 508                                 /* changed on server -- set any w bits  */
 509                                 /* allowed by mnt_file_mode             */
 510                                 inode->i_mode |= (S_IWUGO &
 511                                                   cifs_sb->mnt_file_mode);
 512                 /* BB add code here -
 513                    validate if device or weird share or device type? */
 514                 }
 515
 516                 spin_lock(&inode->i_lock);
 517                 if (is_size_safe_to_change(cifsInfo,
 518                                            le64_to_cpu(pfindData->EndOfFile))) {
 519                         /* can not safely shrink the file size here if the
 520                            client is writing to it due to potential races */
 521                         i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
 522
 523                         /* 512 bytes (2**9) is the fake blocksize that must be
 524                            used for this calculation */
 525                         inode->i_blocks = (512 - 1 + le64_to_cpu(
 526                                            pfindData->AllocationSize)) >> 9;
 527                 }
 528                 spin_unlock(&inode->i_lock);
 529
 530                 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
 531
 532                 /* BB fill in uid and gid here? with help from winbind?
 533                    or retrieve from NTFS stream extended attribute */
 534 #ifdef CONFIG_CIFS_EXPERIMENTAL
 535                 /* fill in 0777 bits from ACL */
 536                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 537                         cFYI(1, ("Getting mode bits from ACL"));
 538                         acl_to_uid_mode(inode, full_path, pfid);
 539                 }
 540 #endif
 541                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 542                         /* fill in remaining high mode bits e.g. SUID, VTX */
 543                         get_sfu_mode(inode, full_path, cifs_sb, xid);
 544                 } else if (atomic_read(&cifsInfo->inUse) == 0) {
 545                         inode->i_uid = cifs_sb->mnt_uid;
 546                         inode->i_gid = cifs_sb->mnt_gid;
 547                         /* set so we do not keep refreshing these fields with
 548                            bad data after user has changed them in memory */
 549                         atomic_set(&cifsInfo->inUse, 1);
 550                 }
 551
 552                 cifs_set_ops(inode, is_dfs_referral);
 553         }
 554 cgii_exit:
 555         kfree(buf);
 556         return rc;
 557 }
 558
 559 static const struct inode_operations cifs_ipc_inode_ops = {
 560         .lookup = cifs_lookup,
 561 };
 562
 563 /* gets root inode */
 564 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
 565 {
 566         int xid;
 567         struct cifs_sb_info *cifs_sb;
 568         struct inode *inode;
 569         long rc;
 570
 571         inode = iget_locked(sb, ino);
 572         if (!inode)
 573                 return ERR_PTR(-ENOMEM);
 574         if (!(inode->i_state & I_NEW))
 575                 return inode;
 576
 577         cifs_sb = CIFS_SB(inode->i_sb);
 578         xid = GetXid();
 579
 580         if (cifs_sb->tcon->unix_ext)
 581                 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
 582         else
 583                 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
 584                                          NULL);
 585         if (rc && cifs_sb->tcon->ipc) {
 586                 cFYI(1, ("ipc connection - fake read inode"));
 587                 inode->i_mode |= S_IFDIR;
 588                 inode->i_nlink = 2;
 589                 inode->i_op = &cifs_ipc_inode_ops;
 590                 inode->i_fop = &simple_dir_operations;
 591                 inode->i_uid = cifs_sb->mnt_uid;
 592                 inode->i_gid = cifs_sb->mnt_gid;
 593                 _FreeXid(xid);
 594                 iget_failed(inode);
 595                 return ERR_PTR(rc);
 596         }
 597
 598         unlock_new_inode(inode);
 599
 600         /* can not call macro FreeXid here since in a void func
 601          * TODO: This is no longer true
 602          */
 603         _FreeXid(xid);
 604         return inode;
 605 }
 606
 607 int cifs_unlink(struct inode *inode, struct dentry *direntry)
 608 {
 609         int rc = 0;
 610         int xid;
 611         struct cifs_sb_info *cifs_sb;
 612         struct cifsTconInfo *pTcon;
 613         char *full_path = NULL;
 614         struct cifsInodeInfo *cifsInode;
 615         FILE_BASIC_INFO *pinfo_buf;
 616
 617         cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
 618
 619         xid = GetXid();
 620
 621         if (inode)
 622                 cifs_sb = CIFS_SB(inode->i_sb);
 623         else
 624                 cifs_sb = CIFS_SB(direntry->d_sb);
 625         pTcon = cifs_sb->tcon;
 626
 627         /* Unlink can be called from rename so we can not grab the sem here
 628            since we deadlock otherwise */
 629 /*      mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
 630         full_path = build_path_from_dentry(direntry);
 631 /*      mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
 632         if (full_path == NULL) {
 633                 FreeXid(xid);
 634                 return -ENOMEM;
 635         }
 636
 637         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 638                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 639                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 640                 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
 641                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
 642                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 643                 cFYI(1, ("posix del rc %d", rc));
 644                 if ((rc == 0) || (rc == -ENOENT))
 645                         goto psx_del_no_retry;
 646         }
 647
 648         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
 649                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 650 psx_del_no_retry:
 651         if (!rc) {
 652                 if (direntry->d_inode)
 653                         drop_nlink(direntry->d_inode);
 654         } else if (rc == -ENOENT) {
 655                 d_drop(direntry);
 656         } else if (rc == -ETXTBSY) {
 657                 int oplock = 0;
 658                 __u16 netfid;
 659
 660                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
 661                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
 662                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
 663                                  cifs_sb->mnt_cifs_flags &
 664                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 665                 if (rc == 0) {
 666                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
 667                                               cifs_sb->local_nls,
 668                                               cifs_sb->mnt_cifs_flags &
 669                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 670                         CIFSSMBClose(xid, pTcon, netfid);
 671                         if (direntry->d_inode)
 672                                 drop_nlink(direntry->d_inode);
 673                 }
 674         } else if (rc == -EACCES) {
 675                 /* try only if r/o attribute set in local lookup data? */
 676                 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
 677                 if (pinfo_buf) {
 678                         /* ATTRS set to normal clears r/o bit */
 679                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
 680                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
 681                                 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
 682                                                      pinfo_buf,
 683                                                      cifs_sb->local_nls,
 684                                                      cifs_sb->mnt_cifs_flags &
 685                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 686                         else
 687                                 rc = -EOPNOTSUPP;
 688
 689                         if (rc == -EOPNOTSUPP) {
 690                                 int oplock = 0;
 691                                 __u16 netfid;
 692                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
 693                                                           full_path,
 694                                                           (__u16)ATTR_NORMAL,
 695                                                           cifs_sb->local_nls);
 696                            For some strange reason it seems that NT4 eats the
 697                            old setattr call without actually setting the
 698                            attributes so on to the third attempted workaround
 699                            */
 700
 701                         /* BB could scan to see if we already have it open
 702                            and pass in pid of opener to function */
 703                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 704                                                  FILE_OPEN, SYNCHRONIZE |
 705                                                  FILE_WRITE_ATTRIBUTES, 0,
 706                                                  &netfid, &oplock, NULL,
 707                                                  cifs_sb->local_nls,
 708                                                  cifs_sb->mnt_cifs_flags &
 709                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 710                                 if (rc == 0) {
 711                                         rc = CIFSSMBSetFileTimes(xid, pTcon,
 712                                                                  pinfo_buf,
 713                                                                  netfid);
 714                                         CIFSSMBClose(xid, pTcon, netfid);
 715                                 }
 716                         }
 717                         kfree(pinfo_buf);
 718                 }
 719                 if (rc == 0) {
 720                         rc = CIFSSMBDelFile(xid, pTcon, full_path,
 721                                             cifs_sb->local_nls,
 722                                             cifs_sb->mnt_cifs_flags &
 723                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 724                         if (!rc) {
 725                                 if (direntry->d_inode)
 726                                         drop_nlink(direntry->d_inode);
 727                         } else if (rc == -ETXTBSY) {
 728                                 int oplock = 0;
 729                                 __u16 netfid;
 730
 731                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
 732                                                  FILE_OPEN, DELETE,
 733                                                  CREATE_NOT_DIR |
 734                                                  CREATE_DELETE_ON_CLOSE,
 735                                                  &netfid, &oplock, NULL,
 736                                                  cifs_sb->local_nls,
 737                                                  cifs_sb->mnt_cifs_flags &
 738                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 739                                 if (rc == 0) {
 740                                         CIFSSMBRenameOpenFile(xid, pTcon,
 741                                                 netfid, NULL,
 742                                                 cifs_sb->local_nls,
 743                                                 cifs_sb->mnt_cifs_flags &
 744                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 745                                         CIFSSMBClose(xid, pTcon, netfid);
 746                                         if (direntry->d_inode)
 747                                                 drop_nlink(direntry->d_inode);
 748                                 }
 749                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
 750                         }
 751                 }
 752         }
 753         if (direntry->d_inode) {
 754                 cifsInode = CIFS_I(direntry->d_inode);
 755                 cifsInode->time = 0;    /* will force revalidate to get info
 756                                            when needed */
 757                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
 758         }
 759         if (inode) {
 760                 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
 761                 cifsInode = CIFS_I(inode);
 762                 cifsInode->time = 0;    /* force revalidate of dir as well */
 763         }
 764
 765         kfree(full_path);
 766         FreeXid(xid);
 767         return rc;
 768 }
 769
 770 static void posix_fill_in_inode(struct inode *tmp_inode,
 771         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 772 {
 773         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 774         loff_t local_size;
 775         struct timespec local_mtime;
 776
 777         cifsInfo->time = jiffies;
 778         atomic_inc(&cifsInfo->inUse);
 779
 780         /* save mtime and size */
 781         local_mtime = tmp_inode->i_mtime;
 782         local_size  = tmp_inode->i_size;
 783
 784         cifs_unix_info_to_inode(tmp_inode, pData, 1);
 785         cifs_set_ops(tmp_inode, false);
 786
 787         if (!S_ISREG(tmp_inode->i_mode))
 788                 return;
 789
 790         /*
 791          * No sense invalidating pages for new inode
 792          * since we we have not started caching
 793          * readahead file data yet.
 794          */
 795         if (isNewInode)
 796                 return;
 797
 798         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 799                 (local_size == tmp_inode->i_size)) {
 800                 cFYI(1, ("inode exists but unchanged"));
 801         } else {
 802                 /* file may have changed on server */
 803                 cFYI(1, ("invalidate inode, readdir detected change"));
 804                 invalidate_remote_inode(tmp_inode);
 805         }
 806 }
 807
 808 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 809 {
 810         int rc = 0;
 811         int xid;
 812         struct cifs_sb_info *cifs_sb;
 813         struct cifsTconInfo *pTcon;
 814         char *full_path = NULL;
 815         struct inode *newinode = NULL;
 816
 817         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
 818
 819         xid = GetXid();
 820
 821         cifs_sb = CIFS_SB(inode->i_sb);
 822         pTcon = cifs_sb->tcon;
 823
 824         full_path = build_path_from_dentry(direntry);
 825         if (full_path == NULL) {
 826                 FreeXid(xid);
 827                 return -ENOMEM;
 828         }
 829
 830         if ((pTcon->ses->capabilities & CAP_UNIX) &&
 831                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 832                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
 833                 u32 oplock = 0;
 834                 FILE_UNIX_BASIC_INFO *pInfo =
 835                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
 836                 if (pInfo == NULL) {
 837                         rc = -ENOMEM;
 838                         goto mkdir_out;
 839                 }
 840
 841                 mode &= ~current->fs->umask;
 842                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
 843                                 mode, NULL /* netfid */, pInfo, &oplock,
 844                                 full_path, cifs_sb->local_nls,
 845                                 cifs_sb->mnt_cifs_flags &
 846                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 847                 if (rc == -EOPNOTSUPP) {
 848                         kfree(pInfo);
 849                         goto mkdir_retry_old;
 850                 } else if (rc) {
 851                         cFYI(1, ("posix mkdir returned 0x%x", rc));
 852                         d_drop(direntry);
 853                 } else {
 854                         if (pInfo->Type == cpu_to_le32(-1)) {
 855                                 /* no return info, go query for it */
 856                                 kfree(pInfo);
 857                                 goto mkdir_get_info;
 858                         }
 859 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
 860         to set uid/gid */
 861                         inc_nlink(inode);
 862                         if (pTcon->nocase)
 863                                 direntry->d_op = &cifs_ci_dentry_ops;
 864                         else
 865                                 direntry->d_op = &cifs_dentry_ops;
 866
 867                         newinode = new_inode(inode->i_sb);
 868                         if (newinode == NULL) {
 869                                 kfree(pInfo);
 870                                 goto mkdir_get_info;
 871                         }
 872                         /* Is an i_ino of zero legal? */
 873                         /* Are there sanity checks we can use to ensure that
 874                            the server is really filling in that field? */
 875                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 876                                 newinode->i_ino =
 877                                         (unsigned long)pInfo->UniqueId;
 878                         } /* note ino incremented to unique num in new_inode */
 879                         if (inode->i_sb->s_flags & MS_NOATIME)
 880                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
 881                         newinode->i_nlink = 2;
 882
 883                         insert_inode_hash(newinode);
 884                         d_instantiate(direntry, newinode);
 885
 886                         /* we already checked in POSIXCreate whether
 887                            frame was long enough */
 888                         posix_fill_in_inode(direntry->d_inode,
 889                                         pInfo, 1 /* NewInode */);
 890 #ifdef CONFIG_CIFS_DEBUG2
 891                         cFYI(1, ("instantiated dentry %p %s to inode %p",
 892                                 direntry, direntry->d_name.name, newinode));
 893
 894                         if (newinode->i_nlink != 2)
 895                                 cFYI(1, ("unexpected number of links %d",
 896                                         newinode->i_nlink));
 897 #endif
 898                 }
 899                 kfree(pInfo);
 900                 goto mkdir_out;
 901         }
 902 mkdir_retry_old:
 903         /* BB add setting the equivalent of mode via CreateX w/ACLs */
 904         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
 905                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 906         if (rc) {
 907                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
 908                 d_drop(direntry);
 909         } else {
 910 mkdir_get_info:
 911                 inc_nlink(inode);
 912                 if (pTcon->unix_ext)
 913                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 914                                                       inode->i_sb, xid);
 915                 else
 916                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 917                                                  inode->i_sb, xid, NULL);
 918
 919                 if (pTcon->nocase)
 920                         direntry->d_op = &cifs_ci_dentry_ops;
 921                 else
 922                         direntry->d_op = &cifs_dentry_ops;
 923                 d_instantiate(direntry, newinode);
 924                  /* setting nlink not necessary except in cases where we
 925                   * failed to get it from the server or was set bogus */
 926                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
 927                                 direntry->d_inode->i_nlink = 2;
 928                 mode &= ~current->fs->umask;
 929                 if (pTcon->unix_ext) {
 930                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 931                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 932                                                     mode,
 933                                                     (__u64)current->fsuid,
 934                                                     (__u64)current->fsgid,
 935                                                     0 /* dev_t */,
 936                                                     cifs_sb->local_nls,
 937                                                     cifs_sb->mnt_cifs_flags &
 938                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 939                         } else {
 940                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 941                                                     mode, (__u64)-1,
 942                                                     (__u64)-1, 0 /* dev_t */,
 943                                                     cifs_sb->local_nls,
 944                                                     cifs_sb->mnt_cifs_flags &
 945                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
 946                         }
 947                 } else {
 948                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
 949                             (mode & S_IWUGO) == 0) {
 950                                 FILE_BASIC_INFO pInfo;
 951                                 memset(&pInfo, 0, sizeof(pInfo));
 952                                 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
 953                                 CIFSSMBSetTimes(xid, pTcon, full_path,
 954                                                 &pInfo, cifs_sb->local_nls,
 955                                                 cifs_sb->mnt_cifs_flags &
 956                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 957                         }
 958                         if (direntry->d_inode) {
 959                                 direntry->d_inode->i_mode = mode;
 960                                 direntry->d_inode->i_mode |= S_IFDIR;
 961                                 if (cifs_sb->mnt_cifs_flags &
 962                                      CIFS_MOUNT_SET_UID) {
 963                                         direntry->d_inode->i_uid =
 964                                                 current->fsuid;
 965                                         direntry->d_inode->i_gid =
 966                                                 current->fsgid;
 967                                 }
 968                         }
 969                 }
 970         }
 971 mkdir_out:
 972         kfree(full_path);
 973         FreeXid(xid);
 974         return rc;
 975 }
 976
 977 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 978 {
 979         int rc = 0;
 980         int xid;
 981         struct cifs_sb_info *cifs_sb;
 982         struct cifsTconInfo *pTcon;
 983         char *full_path = NULL;
 984         struct cifsInodeInfo *cifsInode;
 985
 986         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
 987
 988         xid = GetXid();
 989
 990         cifs_sb = CIFS_SB(inode->i_sb);
 991         pTcon = cifs_sb->tcon;
 992
 993         full_path = build_path_from_dentry(direntry);
 994         if (full_path == NULL) {
 995                 FreeXid(xid);
 996                 return -ENOMEM;
 997         }
 998
 999         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1000                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1001
1002         if (!rc) {
1003                 drop_nlink(inode);
1004                 spin_lock(&direntry->d_inode->i_lock);
1005                 i_size_write(direntry->d_inode, 0);
1006                 clear_nlink(direntry->d_inode);
1007                 spin_unlock(&direntry->d_inode->i_lock);
1008         }
1009
1010         cifsInode = CIFS_I(direntry->d_inode);
1011         cifsInode->time = 0;    /* force revalidate to go get info when
1012                                    needed */
1013         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1014                 current_fs_time(inode->i_sb);
1015
1016         kfree(full_path);
1017         FreeXid(xid);
1018         return rc;
1019 }
1020
1021 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1022         struct inode *target_inode, struct dentry *target_direntry)
1023 {
1024         char *fromName;
1025         char *toName;
1026         struct cifs_sb_info *cifs_sb_source;
1027         struct cifs_sb_info *cifs_sb_target;
1028         struct cifsTconInfo *pTcon;
1029         int xid;
1030         int rc = 0;
1031
1032         xid = GetXid();
1033
1034         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1035         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1036         pTcon = cifs_sb_source->tcon;
1037
1038         if (pTcon != cifs_sb_target->tcon) {
1039                 FreeXid(xid);
1040                 return -EXDEV;  /* BB actually could be allowed if same server,
1041                                    but different share.
1042                                    Might eventually add support for this */
1043         }
1044
1045         /* we already  have the rename sem so we do not need to grab it again
1046            here to protect the path integrity */
1047         fromName = build_path_from_dentry(source_direntry);
1048         toName = build_path_from_dentry(target_direntry);
1049         if ((fromName == NULL) || (toName == NULL)) {
1050                 rc = -ENOMEM;
1051                 goto cifs_rename_exit;
1052         }
1053
1054         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1055                            cifs_sb_source->local_nls,
1056                            cifs_sb_source->mnt_cifs_flags &
1057                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1058         if (rc == -EEXIST) {
1059                 /* check if they are the same file because rename of hardlinked
1060                    files is a noop */
1061                 FILE_UNIX_BASIC_INFO *info_buf_source;
1062                 FILE_UNIX_BASIC_INFO *info_buf_target;
1063
1064                 info_buf_source =
1065                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1066                 if (info_buf_source != NULL) {
1067                         info_buf_target = info_buf_source + 1;
1068                         if (pTcon->unix_ext)
1069                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1070                                         info_buf_source,
1071                                         cifs_sb_source->local_nls,
1072                                         cifs_sb_source->mnt_cifs_flags &
1073                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1074                         /* else rc is still EEXIST so will fall through to
1075                            unlink the target and retry rename */
1076                         if (rc == 0) {
1077                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1078                                                 info_buf_target,
1079                                                 cifs_sb_target->local_nls,
1080                                                 /* remap based on source sb */
1081                                                 cifs_sb_source->mnt_cifs_flags &
1082                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
1083                         }
1084                         if ((rc == 0) &&
1085                             (info_buf_source->UniqueId ==
1086                              info_buf_target->UniqueId)) {
1087                         /* do not rename since the files are hardlinked which
1088                            is a noop */
1089                         } else {
1090                         /* we either can not tell the files are hardlinked
1091                            (as with Windows servers) or files are not
1092                            hardlinked so delete the target manually before
1093                            renaming to follow POSIX rather than Windows
1094                            semantics */
1095                                 cifs_unlink(target_inode, target_direntry);
1096                                 rc = CIFSSMBRename(xid, pTcon, fromName,
1097                                                    toName,
1098                                                    cifs_sb_source->local_nls,
1099                                                    cifs_sb_source->mnt_cifs_flags
1100                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
1101                         }
1102                         kfree(info_buf_source);
1103                 } /* if we can not get memory just leave rc as EEXIST */
1104         }
1105
1106         if (rc)
1107                 cFYI(1, ("rename rc %d", rc));
1108
1109         if ((rc == -EIO) || (rc == -EEXIST)) {
1110                 int oplock = 0;
1111                 __u16 netfid;
1112
1113                 /* BB FIXME Is Generic Read correct for rename? */
1114                 /* if renaming directory - we should not say CREATE_NOT_DIR,
1115                    need to test renaming open directory, also GENERIC_READ
1116                    might not right be right access to request */
1117                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1118                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
1119                                  cifs_sb_source->local_nls,
1120                                  cifs_sb_source->mnt_cifs_flags &
1121                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1122                 if (rc == 0) {
1123                         rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1124                                               cifs_sb_source->local_nls,
1125                                               cifs_sb_source->mnt_cifs_flags &
1126                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1127                         CIFSSMBClose(xid, pTcon, netfid);
1128                 }
1129         }
1130
1131 cifs_rename_exit:
1132         kfree(fromName);
1133         kfree(toName);
1134         FreeXid(xid);
1135         return rc;
1136 }
1137
1138 int cifs_revalidate(struct dentry *direntry)
1139 {
1140         int xid;
1141         int rc = 0, wbrc = 0;
1142         char *full_path;
1143         struct cifs_sb_info *cifs_sb;
1144         struct cifsInodeInfo *cifsInode;
1145         loff_t local_size;
1146         struct timespec local_mtime;
1147         bool invalidate_inode = false;
1148
1149         if (direntry->d_inode == NULL)
1150                 return -ENOENT;
1151
1152         cifsInode = CIFS_I(direntry->d_inode);
1153
1154         if (cifsInode == NULL)
1155                 return -ENOENT;
1156
1157         /* no sense revalidating inode info on file that no one can write */
1158         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1159                 return rc;
1160
1161         xid = GetXid();
1162
1163         cifs_sb = CIFS_SB(direntry->d_sb);
1164
1165         /* can not safely grab the rename sem here if rename calls revalidate
1166            since that would deadlock */
1167         full_path = build_path_from_dentry(direntry);
1168         if (full_path == NULL) {
1169                 FreeXid(xid);
1170                 return -ENOMEM;
1171         }
1172         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1173                  "jiffies %ld", full_path, direntry->d_inode,
1174                  direntry->d_inode->i_count.counter, direntry,
1175                  direntry->d_time, jiffies));
1176
1177         if (cifsInode->time == 0) {
1178                 /* was set to zero previously to force revalidate */
1179         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1180                    lookupCacheEnabled) {
1181                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1182                     (direntry->d_inode->i_nlink == 1)) {
1183                         kfree(full_path);
1184                         FreeXid(xid);
1185                         return rc;
1186                 } else {
1187                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1188                 }
1189         }
1190
1191         /* save mtime and size */
1192         local_mtime = direntry->d_inode->i_mtime;
1193         local_size = direntry->d_inode->i_size;
1194
1195         if (cifs_sb->tcon->unix_ext) {
1196                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1197                                               direntry->d_sb, xid);
1198                 if (rc) {
1199                         cFYI(1, ("error on getting revalidate info %d", rc));
1200 /*                      if (rc != -ENOENT)
1201                                 rc = 0; */      /* BB should we cache info on
1202                                                    certain errors? */
1203                 }
1204         } else {
1205                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1206                                          direntry->d_sb, xid, NULL);
1207                 if (rc) {
1208                         cFYI(1, ("error on getting revalidate info %d", rc));
1209 /*                      if (rc != -ENOENT)
1210                                 rc = 0; */      /* BB should we cache info on
1211                                                    certain errors? */
1212                 }
1213         }
1214         /* should we remap certain errors, access denied?, to zero */
1215
1216         /* if not oplocked, we invalidate inode pages if mtime or file size
1217            had changed on server */
1218
1219         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1220             (local_size == direntry->d_inode->i_size)) {
1221                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1222         } else {
1223                 /* file may have changed on server */
1224                 if (cifsInode->clientCanCacheRead) {
1225                         /* no need to invalidate inode pages since we were the
1226                            only ones who could have modified the file and the
1227                            server copy is staler than ours */
1228                 } else {
1229                         invalidate_inode = true;
1230                 }
1231         }
1232
1233         /* can not grab this sem since kernel filesys locking documentation
1234            indicates i_mutex may be taken by the kernel on lookup and rename
1235            which could deadlock if we grab the i_mutex here as well */
1236 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1237         /* need to write out dirty pages here  */
1238         if (direntry->d_inode->i_mapping) {
1239                 /* do we need to lock inode until after invalidate completes
1240                    below? */
1241                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1242                 if (wbrc)
1243                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1244         }
1245         if (invalidate_inode) {
1246         /* shrink_dcache not necessary now that cifs dentry ops
1247         are exported for negative dentries */
1248 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1249                         shrink_dcache_parent(direntry); */
1250                 if (S_ISREG(direntry->d_inode->i_mode)) {
1251                         if (direntry->d_inode->i_mapping)
1252                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1253                                 if (wbrc)
1254                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1255                         /* may eventually have to do this for open files too */
1256                         if (list_empty(&(cifsInode->openFileList))) {
1257                                 /* changed on server - flush read ahead pages */
1258                                 cFYI(1, ("Invalidating read ahead data on "
1259                                          "closed file"));
1260                                 invalidate_remote_inode(direntry->d_inode);
1261                         }
1262                 }
1263         }
1264 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1265
1266         kfree(full_path);
1267         FreeXid(xid);
1268         return rc;
1269 }
1270
1271 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1272         struct kstat *stat)
1273 {
1274         int err = cifs_revalidate(dentry);
1275         if (!err) {
1276                 generic_fillattr(dentry->d_inode, stat);
1277                 stat->blksize = CIFS_MAX_MSGSIZE;
1278         }
1279         return err;
1280 }
1281
1282 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1283 {
1284         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1285         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1286         struct page *page;
1287         int rc = 0;
1288
1289         page = grab_cache_page(mapping, index);
1290         if (!page)
1291                 return -ENOMEM;
1292
1293         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1294         unlock_page(page);
1295         page_cache_release(page);
1296         return rc;
1297 }
1298
1299 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1300 {
1301         struct address_space *mapping = inode->i_mapping;
1302         unsigned long limit;
1303
1304         spin_lock(&inode->i_lock);
1305         if (inode->i_size < offset)
1306                 goto do_expand;
1307         /*
1308          * truncation of in-use swapfiles is disallowed - it would cause
1309          * subsequent swapout to scribble on the now-freed blocks.
1310          */
1311         if (IS_SWAPFILE(inode)) {
1312                 spin_unlock(&inode->i_lock);
1313                 goto out_busy;
1314         }
1315         i_size_write(inode, offset);
1316         spin_unlock(&inode->i_lock);
1317         /*
1318          * unmap_mapping_range is called twice, first simply for efficiency
1319          * so that truncate_inode_pages does fewer single-page unmaps. However
1320          * after this first call, and before truncate_inode_pages finishes,
1321          * it is possible for private pages to be COWed, which remain after
1322          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1323          * call must be made for correctness.
1324          */
1325         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1326         truncate_inode_pages(mapping, offset);
1327         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1328         goto out_truncate;
1329
1330 do_expand:
1331         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1332         if (limit != RLIM_INFINITY && offset > limit) {
1333                 spin_unlock(&inode->i_lock);
1334                 goto out_sig;
1335         }
1336         if (offset > inode->i_sb->s_maxbytes) {
1337                 spin_unlock(&inode->i_lock);
1338                 goto out_big;
1339         }
1340         i_size_write(inode, offset);
1341         spin_unlock(&inode->i_lock);
1342 out_truncate:
1343         if (inode->i_op && inode->i_op->truncate)
1344                 inode->i_op->truncate(inode);
1345         return 0;
1346 out_sig:
1347         send_sig(SIGXFSZ, current, 0);
1348 out_big:
1349         return -EFBIG;
1350 out_busy:
1351         return -ETXTBSY;
1352 }
1353
1354 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1355 {
1356         int xid;
1357         struct cifs_sb_info *cifs_sb;
1358         struct cifsTconInfo *pTcon;
1359         char *full_path = NULL;
1360         int rc = -EACCES;
1361         struct cifsFileInfo *open_file = NULL;
1362         FILE_BASIC_INFO time_buf;
1363         bool set_time = false;
1364         bool set_dosattr = false;
1365         __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1366         __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1367         __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1368         struct cifsInodeInfo *cifsInode;
1369         struct inode *inode = direntry->d_inode;
1370
1371         xid = GetXid();
1372
1373         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1374                  direntry->d_name.name, attrs->ia_valid));
1375
1376         cifs_sb = CIFS_SB(inode->i_sb);
1377         pTcon = cifs_sb->tcon;
1378
1379         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1380                 /* check if we have permission to change attrs */
1381                 rc = inode_change_ok(inode, attrs);
1382                 if (rc < 0) {
1383                         FreeXid(xid);
1384                         return rc;
1385                 } else
1386                         rc = 0;
1387         }
1388
1389         full_path = build_path_from_dentry(direntry);
1390         if (full_path == NULL) {
1391                 FreeXid(xid);
1392                 return -ENOMEM;
1393         }
1394         cifsInode = CIFS_I(inode);
1395
1396         if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1397                 /*
1398                    Flush data before changing file size or changing the last
1399                    write time of the file on the server. If the
1400                    flush returns error, store it to report later and continue.
1401                    BB: This should be smarter. Why bother flushing pages that
1402                    will be truncated anyway? Also, should we error out here if
1403                    the flush returns error?
1404                  */
1405                 rc = filemap_write_and_wait(inode->i_mapping);
1406                 if (rc != 0) {
1407                         cifsInode->write_behind_rc = rc;
1408                         rc = 0;
1409                 }
1410         }
1411
1412         if (attrs->ia_valid & ATTR_SIZE) {
1413                 /* To avoid spurious oplock breaks from server, in the case of
1414                    inodes that we already have open, avoid doing path based
1415                    setting of file size if we can do it by handle.
1416                    This keeps our caching token (oplock) and avoids timeouts
1417                    when the local oplock break takes longer to flush
1418                    writebehind data than the SMB timeout for the SetPathInfo
1419                    request would allow */
1420
1421                 open_file = find_writable_file(cifsInode);
1422                 if (open_file) {
1423                         __u16 nfid = open_file->netfid;
1424                         __u32 npid = open_file->pid;
1425                         rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1426                                                 nfid, npid, false);
1427                         atomic_dec(&open_file->wrtPending);
1428                         cFYI(1, ("SetFSize for attrs rc = %d", rc));
1429                         if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1430                                 unsigned int bytes_written;
1431                                 rc = CIFSSMBWrite(xid, pTcon,
1432                                                   nfid, 0, attrs->ia_size,
1433                                                   &bytes_written, NULL, NULL,
1434                                                   1 /* 45 seconds */);
1435                                 cFYI(1, ("Wrt seteof rc %d", rc));
1436                         }
1437                 } else
1438                         rc = -EINVAL;
1439
1440                 if (rc != 0) {
1441                         /* Set file size by pathname rather than by handle
1442                            either because no valid, writeable file handle for
1443                            it was found or because there was an error setting
1444                            it by handle */
1445                         rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1446                                            attrs->ia_size, false,
1447                                            cifs_sb->local_nls,
1448                                            cifs_sb->mnt_cifs_flags &
1449                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1450                         cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1451                         if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1452                                 __u16 netfid;
1453                                 int oplock = 0;
1454
1455                                 rc = SMBLegacyOpen(xid, pTcon, full_path,
1456                                         FILE_OPEN, GENERIC_WRITE,
1457                                         CREATE_NOT_DIR, &netfid, &oplock,
1458                                         NULL, cifs_sb->local_nls,
1459                                         cifs_sb->mnt_cifs_flags &
1460                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1461                                 if (rc == 0) {
1462                                         unsigned int bytes_written;
1463                                         rc = CIFSSMBWrite(xid, pTcon,
1464                                                         netfid, 0,
1465                                                         attrs->ia_size,
1466                                                         &bytes_written, NULL,
1467                                                         NULL, 1 /* 45 sec */);
1468                                         cFYI(1, ("wrt seteof rc %d", rc));
1469                                         CIFSSMBClose(xid, pTcon, netfid);
1470                                 }
1471
1472                         }
1473                 }
1474
1475                 /* Server is ok setting allocation size implicitly - no need
1476                    to call:
1477                 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, true,
1478                          cifs_sb->local_nls);
1479                    */
1480
1481                 if (rc == 0) {
1482                         rc = cifs_vmtruncate(inode, attrs->ia_size);
1483                         cifs_truncate_page(inode->i_mapping, inode->i_size);
1484                 } else
1485                         goto cifs_setattr_exit;
1486         }
1487         if (attrs->ia_valid & ATTR_UID) {
1488                 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1489                 uid = attrs->ia_uid;
1490         }
1491         if (attrs->ia_valid & ATTR_GID) {
1492                 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1493                 gid = attrs->ia_gid;
1494         }
1495
1496         time_buf.Attributes = 0;
1497
1498         /* skip mode change if it's just for clearing setuid/setgid */
1499         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1500                 attrs->ia_valid &= ~ATTR_MODE;
1501
1502         if (attrs->ia_valid & ATTR_MODE) {
1503                 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1504                 mode = attrs->ia_mode;
1505         }
1506
1507         if ((pTcon->unix_ext)
1508             && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1509                 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1510                                          0 /* dev_t */, cifs_sb->local_nls,
1511                                          cifs_sb->mnt_cifs_flags &
1512                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1513         else if (attrs->ia_valid & ATTR_MODE) {
1514                 rc = 0;
1515 #ifdef CONFIG_CIFS_EXPERIMENTAL
1516                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1517                         rc = mode_to_acl(inode, full_path, mode);
1518                 else if ((mode & S_IWUGO) == 0) {
1519 #else
1520                 if ((mode & S_IWUGO) == 0) {
1521 #endif
1522                         /* not writeable */
1523                         if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1524                                 set_dosattr = true;
1525                                 time_buf.Attributes =
1526                                         cpu_to_le32(cifsInode->cifsAttrs |
1527                                                     ATTR_READONLY);
1528                         }
1529                 } else if (cifsInode->cifsAttrs & ATTR_READONLY) {
1530                         /* If file is readonly on server, we would
1531                         not be able to write to it - so if any write
1532                         bit is enabled for user or group or other we
1533                         need to at least try to remove r/o dos attr */
1534                         set_dosattr = true;
1535                         time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs &
1536                                             (~ATTR_READONLY));
1537                         /* Windows ignores set to zero */
1538                         if (time_buf.Attributes == 0)
1539                                 time_buf.Attributes |= cpu_to_le32(ATTR_NORMAL);
1540                 }
1541         }
1542
1543         if (attrs->ia_valid & ATTR_ATIME) {
1544                 set_time = true;
1545                 time_buf.LastAccessTime =
1546                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1547         } else
1548                 time_buf.LastAccessTime = 0;
1549
1550         if (attrs->ia_valid & ATTR_MTIME) {
1551                 set_time = true;
1552                 time_buf.LastWriteTime =
1553                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1554         } else
1555                 time_buf.LastWriteTime = 0;
1556         /* Do not set ctime explicitly unless other time
1557            stamps are changed explicitly (i.e. by utime()
1558            since we would then have a mix of client and
1559            server times */
1560
1561         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1562                 set_time = true;
1563                 /* Although Samba throws this field away
1564                 it may be useful to Windows - but we do
1565                 not want to set ctime unless some other
1566                 timestamp is changing */
1567                 cFYI(1, ("CIFS - CTIME changed"));
1568                 time_buf.ChangeTime =
1569                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1570         } else
1571                 time_buf.ChangeTime = 0;
1572
1573         if (set_time || set_dosattr) {
1574                 time_buf.CreationTime = 0;      /* do not change */
1575                 /* In the future we should experiment - try setting timestamps
1576                    via Handle (SetFileInfo) instead of by path */
1577                 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1578                         rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1579                                              cifs_sb->local_nls,
1580                                              cifs_sb->mnt_cifs_flags &
1581                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1582                 else
1583                         rc = -EOPNOTSUPP;
1584
1585                 if (rc == -EOPNOTSUPP) {
1586                         int oplock = 0;
1587                         __u16 netfid;
1588
1589                         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1590                                  "times not supported by this server"));
1591                         /* BB we could scan to see if we already have it open
1592                            and pass in pid of opener to function */
1593                         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1594                                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1595                                          CREATE_NOT_DIR, &netfid, &oplock,
1596                                          NULL, cifs_sb->local_nls,
1597                                          cifs_sb->mnt_cifs_flags &
1598                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1599                         if (rc == 0) {
1600                                 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1601                                                          netfid);
1602                                 CIFSSMBClose(xid, pTcon, netfid);
1603                         } else {
1604                         /* BB For even older servers we could convert time_buf
1605                            into old DOS style which uses two second
1606                            granularity */
1607
1608                         /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1609                                         &time_buf, cifs_sb->local_nls); */
1610                         }
1611                 }
1612                 /* Even if error on time set, no sense failing the call if
1613                 the server would set the time to a reasonable value anyway,
1614                 and this check ensures that we are not being called from
1615                 sys_utimes in which case we ought to fail the call back to
1616                 the user when the server rejects the call */
1617                 if ((rc) && (attrs->ia_valid &
1618                          (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1619                         rc = 0;
1620         }
1621
1622         /* do not need local check to inode_check_ok since the server does
1623            that */
1624         if (!rc)
1625                 rc = inode_setattr(inode, attrs);
1626 cifs_setattr_exit:
1627         kfree(full_path);
1628         FreeXid(xid);
1629         return rc;
1630 }
1631
1632 #if 0
1633 void cifs_delete_inode(struct inode *inode)
1634 {
1635         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1636         /* may have to add back in if and when safe distributed caching of
1637            directories added e.g. via FindNotify */
1638 }
1639 #endif