fs/cifs/cifsfs.c

   1 /*
   2  *   fs/cifs/cifsfs.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2008
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   Common Internet FileSystem (CIFS) client
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 /* Note that BB means BUGBUG (ie something to fix eventually) */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/mount.h>
  29 #include <linux/slab.h>
  30 #include <linux/init.h>
  31 #include <linux/list.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/vfs.h>
  34 #include <linux/mempool.h>
  35 #include <linux/delay.h>
  36 #include <linux/kthread.h>
  37 #include <linux/freezer.h>
  38 #include "cifsfs.h"
  39 #include "cifspdu.h"
  40 #define DECLARE_GLOBALS_HERE
  41 #include "cifsglob.h"
  42 #include "cifsproto.h"
  43 #include "cifs_debug.h"
  44 #include "cifs_fs_sb.h"
  45 #include <linux/mm.h>
  46 #include <linux/key-type.h>
  47 #include "dns_resolve.h"
  48 #include "cifs_spnego.h"
  49 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  50
  51 #ifdef CONFIG_CIFS_QUOTA
  52 static struct quotactl_ops cifs_quotactl_ops;
  53 #endif /* QUOTA */
  54
  55 int cifsFYI = 0;
  56 int cifsERROR = 1;
  57 int traceSMB = 0;
  58 unsigned int oplockEnabled = 1;
  59 unsigned int experimEnabled = 0;
  60 unsigned int linuxExtEnabled = 1;
  61 unsigned int lookupCacheEnabled = 1;
  62 unsigned int multiuser_mount = 0;
  63 unsigned int extended_security = CIFSSEC_DEF;
  64 /* unsigned int ntlmv2_support = 0; */
  65 unsigned int sign_CIFS_PDUs = 1;
  66 extern struct task_struct *oplockThread; /* remove sparse warning */
  67 struct task_struct *oplockThread = NULL;
  68 /* extern struct task_struct * dnotifyThread; remove sparse warning */
  69 #ifdef CONFIG_CIFS_EXPERIMENTAL
  70 static struct task_struct *dnotifyThread = NULL;
  71 #endif
  72 static const struct super_operations cifs_super_ops;
  73 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  74 module_param(CIFSMaxBufSize, int, 0);
  75 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  76                                  "Default: 16384 Range: 8192 to 130048");
  77 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  78 module_param(cifs_min_rcv, int, 0);
  79 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  80                                 "1 to 64");
  81 unsigned int cifs_min_small = 30;
  82 module_param(cifs_min_small, int, 0);
  83 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  84                                  "Range: 2 to 256");
  85 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  86 module_param(cifs_max_pending, int, 0);
  87 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  88                                    "Default: 50 Range: 2 to 256");
  89
  90 extern mempool_t *cifs_sm_req_poolp;
  91 extern mempool_t *cifs_req_poolp;
  92 extern mempool_t *cifs_mid_poolp;
  93
  94 extern struct kmem_cache *cifs_oplock_cachep;
  95
  96 static int
  97 cifs_read_super(struct super_block *sb, void *data,
  98                 const char *devname, int silent)
  99 {
 100         struct inode *inode;
 101         struct cifs_sb_info *cifs_sb;
 102         int rc = 0;
 103
 104         /* BB should we make this contingent on mount parm? */
 105         sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 106         sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 107         cifs_sb = CIFS_SB(sb);
 108         if (cifs_sb == NULL)
 109                 return -ENOMEM;
 110
 111 #ifdef CONFIG_CIFS_DFS_UPCALL
 112         /* copy mount params to sb for use in submounts */
 113         /* BB: should we move this after the mount so we
 114          * do not have to do the copy on failed mounts?
 115          * BB: May be it is better to do simple copy before
 116          * complex operation (mount), and in case of fail
 117          * just exit instead of doing mount and attempting
 118          * undo it if this copy fails?*/
 119         if (data) {
 120                 int len = strlen(data);
 121                 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
 122                 if (cifs_sb->mountdata == NULL) {
 123                         kfree(sb->s_fs_info);
 124                         sb->s_fs_info = NULL;
 125                         return -ENOMEM;
 126                 }
 127                 strncpy(cifs_sb->mountdata, data, len + 1);
 128                 cifs_sb->mountdata[len] = '\0';
 129         }
 130 #endif
 131
 132         rc = cifs_mount(sb, cifs_sb, data, devname);
 133
 134         if (rc) {
 135                 if (!silent)
 136                         cERROR(1,
 137                                ("cifs_mount failed w/return code = %d", rc));
 138                 goto out_mount_failed;
 139         }
 140
 141         sb->s_magic = CIFS_MAGIC_NUMBER;
 142         sb->s_op = &cifs_super_ops;
 143 /*      if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 144             sb->s_blocksize =
 145                 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 146 #ifdef CONFIG_CIFS_QUOTA
 147         sb->s_qcop = &cifs_quotactl_ops;
 148 #endif
 149         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 150         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 151         inode = cifs_iget(sb, ROOT_I);
 152
 153         if (IS_ERR(inode)) {
 154                 rc = PTR_ERR(inode);
 155                 inode = NULL;
 156                 goto out_no_root;
 157         }
 158
 159         sb->s_root = d_alloc_root(inode);
 160
 161         if (!sb->s_root) {
 162                 rc = -ENOMEM;
 163                 goto out_no_root;
 164         }
 165
 166 #ifdef CONFIG_CIFS_EXPERIMENTAL
 167         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 168                 cFYI(1, ("export ops supported"));
 169                 sb->s_export_op = &cifs_export_ops;
 170         }
 171 #endif /* EXPERIMENTAL */
 172
 173         return 0;
 174
 175 out_no_root:
 176         cERROR(1, ("cifs_read_super: get root inode failed"));
 177         if (inode)
 178                 iput(inode);
 179
 180         cifs_umount(sb, cifs_sb);
 181
 182 out_mount_failed:
 183         if (cifs_sb) {
 184 #ifdef CONFIG_CIFS_DFS_UPCALL
 185                 if (cifs_sb->mountdata) {
 186                         kfree(cifs_sb->mountdata);
 187                         cifs_sb->mountdata = NULL;
 188                 }
 189 #endif
 190                 if (cifs_sb->local_nls)
 191                         unload_nls(cifs_sb->local_nls);
 192                 kfree(cifs_sb);
 193         }
 194         return rc;
 195 }
 196
 197 static void
 198 cifs_put_super(struct super_block *sb)
 199 {
 200         int rc = 0;
 201         struct cifs_sb_info *cifs_sb;
 202
 203         cFYI(1, ("In cifs_put_super"));
 204         cifs_sb = CIFS_SB(sb);
 205         if (cifs_sb == NULL) {
 206                 cFYI(1, ("Empty cifs superblock info passed to unmount"));
 207                 return;
 208         }
 209         rc = cifs_umount(sb, cifs_sb);
 210         if (rc)
 211                 cERROR(1, ("cifs_umount failed with return code %d", rc));
 212 #ifdef CONFIG_CIFS_DFS_UPCALL
 213         if (cifs_sb->mountdata) {
 214                 kfree(cifs_sb->mountdata);
 215                 cifs_sb->mountdata = NULL;
 216         }
 217 #endif
 218
 219         unload_nls(cifs_sb->local_nls);
 220         kfree(cifs_sb);
 221         return;
 222 }
 223
 224 static int
 225 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 226 {
 227         struct super_block *sb = dentry->d_sb;
 228         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 229         struct cifsTconInfo *tcon = cifs_sb->tcon;
 230         int rc = -EOPNOTSUPP;
 231         int xid;
 232
 233         xid = GetXid();
 234
 235         buf->f_type = CIFS_MAGIC_NUMBER;
 236
 237         /*
 238          * PATH_MAX may be too long - it would presumably be total path,
 239          * but note that some servers (includinng Samba 3) have a shorter
 240          * maximum path.
 241          *
 242          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 243          */
 244         buf->f_namelen = PATH_MAX;
 245         buf->f_files = 0;       /* undefined */
 246         buf->f_ffree = 0;       /* unlimited */
 247
 248         /*
 249          * We could add a second check for a QFS Unix capability bit
 250          */
 251         if ((tcon->ses->capabilities & CAP_UNIX) &&
 252             (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
 253                 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
 254
 255         /*
 256          * Only need to call the old QFSInfo if failed on newer one,
 257          * e.g. by OS/2.
 258          **/
 259         if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
 260                 rc = CIFSSMBQFSInfo(xid, tcon, buf);
 261
 262         /*
 263          * Some old Windows servers also do not support level 103, retry with
 264          * older level one if old server failed the previous call or we
 265          * bypassed it because we detected that this was an older LANMAN sess
 266          */
 267         if (rc)
 268                 rc = SMBOldQFSInfo(xid, tcon, buf);
 269
 270         FreeXid(xid);
 271         return 0;
 272 }
 273
 274 static int cifs_permission(struct inode *inode, int mask)
 275 {
 276         struct cifs_sb_info *cifs_sb;
 277
 278         cifs_sb = CIFS_SB(inode->i_sb);
 279
 280         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 281                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 282                         return -EACCES;
 283                 else
 284                         return 0;
 285         } else /* file mode might have been restricted at mount time
 286                 on the client (above and beyond ACL on servers) for
 287                 servers which do not support setting and viewing mode bits,
 288                 so allowing client to check permissions is useful */
 289                 return generic_permission(inode, mask, NULL);
 290 }
 291
 292 static struct kmem_cache *cifs_inode_cachep;
 293 static struct kmem_cache *cifs_req_cachep;
 294 static struct kmem_cache *cifs_mid_cachep;
 295 struct kmem_cache *cifs_oplock_cachep;
 296 static struct kmem_cache *cifs_sm_req_cachep;
 297 mempool_t *cifs_sm_req_poolp;
 298 mempool_t *cifs_req_poolp;
 299 mempool_t *cifs_mid_poolp;
 300
 301 static struct inode *
 302 cifs_alloc_inode(struct super_block *sb)
 303 {
 304         struct cifsInodeInfo *cifs_inode;
 305         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 306         if (!cifs_inode)
 307                 return NULL;
 308         cifs_inode->cifsAttrs = 0x20;   /* default */
 309         atomic_set(&cifs_inode->inUse, 0);
 310         cifs_inode->time = 0;
 311         cifs_inode->write_behind_rc = 0;
 312         /* Until the file is open and we have gotten oplock
 313         info back from the server, can not assume caching of
 314         file data or metadata */
 315         cifs_inode->clientCanCacheRead = false;
 316         cifs_inode->clientCanCacheAll = false;
 317         cifs_inode->delete_pending = false;
 318         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 319
 320         /* Can not set i_flags here - they get immediately overwritten
 321            to zero by the VFS */
 322 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 323         INIT_LIST_HEAD(&cifs_inode->openFileList);
 324         return &cifs_inode->vfs_inode;
 325 }
 326
 327 static void
 328 cifs_destroy_inode(struct inode *inode)
 329 {
 330         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 331 }
 332
 333 /*
 334  * cifs_show_options() is for displaying mount options in /proc/mounts.
 335  * Not all settable options are displayed but most of the important
 336  * ones are.
 337  */
 338 static int
 339 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 340 {
 341         struct cifs_sb_info *cifs_sb;
 342         struct cifsTconInfo *tcon;
 343         struct TCP_Server_Info *server;
 344
 345         cifs_sb = CIFS_SB(m->mnt_sb);
 346
 347         if (cifs_sb) {
 348                 tcon = cifs_sb->tcon;
 349                 if (tcon) {
 350                         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 351                         if (tcon->ses) {
 352                                 if (tcon->ses->userName)
 353                                         seq_printf(s, ",username=%s",
 354                                            tcon->ses->userName);
 355                                 if (tcon->ses->domainName)
 356                                         seq_printf(s, ",domain=%s",
 357                                            tcon->ses->domainName);
 358                                 server = tcon->ses->server;
 359                                 if (server) {
 360                                         seq_printf(s, ",addr=");
 361                                         switch (server->addr.sockAddr6.
 362                                                 sin6_family) {
 363                                         case AF_INET6:
 364                                                 seq_printf(s, "%pI6",
 365                                                            &server->addr.sockAddr6.sin6_addr);
 366                                                 break;
 367                                         case AF_INET:
 368                                                 seq_printf(s, "%pI4",
 369                                                            &server->addr.sockAddr.sin_addr.s_addr);
 370                                                 break;
 371                                         }
 372                                 }
 373                         }
 374                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||
 375                            !(tcon->unix_ext))
 376                                 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 377                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||
 378                            !(tcon->unix_ext))
 379                                 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 380                         if (!tcon->unix_ext) {
 381                                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 382                                            cifs_sb->mnt_file_mode,
 383                                            cifs_sb->mnt_dir_mode);
 384                         }
 385                         if (tcon->seal)
 386                                 seq_printf(s, ",seal");
 387                         if (tcon->nocase)
 388                                 seq_printf(s, ",nocase");
 389                         if (tcon->retry)
 390                                 seq_printf(s, ",hard");
 391                 }
 392                 if (cifs_sb->prepath)
 393                         seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 394                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 395                         seq_printf(s, ",posixpaths");
 396                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 397                         seq_printf(s, ",setuids");
 398                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 399                         seq_printf(s, ",serverino");
 400                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 401                         seq_printf(s, ",directio");
 402                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 403                         seq_printf(s, ",nouser_xattr");
 404                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 405                         seq_printf(s, ",mapchars");
 406                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 407                         seq_printf(s, ",sfu");
 408                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 409                         seq_printf(s, ",nobrl");
 410                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 411                         seq_printf(s, ",cifsacl");
 412                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 413                         seq_printf(s, ",dynperm");
 414                 if (m->mnt_sb->s_flags & MS_POSIXACL)
 415                         seq_printf(s, ",acl");
 416
 417                 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 418                 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 419         }
 420         return 0;
 421 }
 422
 423 #ifdef CONFIG_CIFS_QUOTA
 424 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
 425                 struct fs_disk_quota *pdquota)
 426 {
 427         int xid;
 428         int rc = 0;
 429         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 430         struct cifsTconInfo *pTcon;
 431
 432         if (cifs_sb)
 433                 pTcon = cifs_sb->tcon;
 434         else
 435                 return -EIO;
 436
 437
 438         xid = GetXid();
 439         if (pTcon) {
 440                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 441         } else
 442                 rc = -EIO;
 443
 444         FreeXid(xid);
 445         return rc;
 446 }
 447
 448 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
 449                     struct fs_disk_quota *pdquota)
 450 {
 451         int xid;
 452         int rc = 0;
 453         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 454         struct cifsTconInfo *pTcon;
 455
 456         if (cifs_sb)
 457                 pTcon = cifs_sb->tcon;
 458         else
 459                 return -EIO;
 460
 461         xid = GetXid();
 462         if (pTcon) {
 463                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 464         } else
 465                 rc = -EIO;
 466
 467         FreeXid(xid);
 468         return rc;
 469 }
 470
 471 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
 472 {
 473         int xid;
 474         int rc = 0;
 475         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 476         struct cifsTconInfo *pTcon;
 477
 478         if (cifs_sb)
 479                 pTcon = cifs_sb->tcon;
 480         else
 481                 return -EIO;
 482
 483         xid = GetXid();
 484         if (pTcon) {
 485                 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
 486         } else
 487                 rc = -EIO;
 488
 489         FreeXid(xid);
 490         return rc;
 491 }
 492
 493 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
 494 {
 495         int xid;
 496         int rc = 0;
 497         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 498         struct cifsTconInfo *pTcon;
 499
 500         if (cifs_sb)
 501                 pTcon = cifs_sb->tcon;
 502         else
 503                 return -EIO;
 504
 505         xid = GetXid();
 506         if (pTcon) {
 507                 cFYI(1, ("pqstats %p", qstats));
 508         } else
 509                 rc = -EIO;
 510
 511         FreeXid(xid);
 512         return rc;
 513 }
 514
 515 static struct quotactl_ops cifs_quotactl_ops = {
 516         .set_xquota     = cifs_xquota_set,
 517         .get_xquota     = cifs_xquota_get,
 518         .set_xstate     = cifs_xstate_set,
 519         .get_xstate     = cifs_xstate_get,
 520 };
 521 #endif
 522
 523 static void cifs_umount_begin(struct super_block *sb)
 524 {
 525         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 526         struct cifsTconInfo *tcon;
 527
 528         if (cifs_sb == NULL)
 529                 return;
 530
 531         tcon = cifs_sb->tcon;
 532         if (tcon == NULL)
 533                 return;
 534
 535         read_lock(&cifs_tcp_ses_lock);
 536         if (tcon->tc_count == 1)
 537                 tcon->tidStatus = CifsExiting;
 538         read_unlock(&cifs_tcp_ses_lock);
 539
 540         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 541         /* cancel_notify_requests(tcon); */
 542         if (tcon->ses && tcon->ses->server) {
 543                 cFYI(1, ("wake up tasks now - umount begin not complete"));
 544                 wake_up_all(&tcon->ses->server->request_q);
 545                 wake_up_all(&tcon->ses->server->response_q);
 546                 msleep(1); /* yield */
 547                 /* we have to kick the requests once more */
 548                 wake_up_all(&tcon->ses->server->response_q);
 549                 msleep(1);
 550         }
 551 /* BB FIXME - finish add checks for tidStatus BB */
 552
 553         return;
 554 }
 555
 556 #ifdef CONFIG_CIFS_STATS2
 557 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 558 {
 559         /* BB FIXME */
 560         return 0;
 561 }
 562 #endif
 563
 564 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 565 {
 566         *flags |= MS_NODIRATIME;
 567         return 0;
 568 }
 569
 570 static const struct super_operations cifs_super_ops = {
 571         .put_super = cifs_put_super,
 572         .statfs = cifs_statfs,
 573         .alloc_inode = cifs_alloc_inode,
 574         .destroy_inode = cifs_destroy_inode,
 575 /*      .drop_inode         = generic_delete_inode,
 576         .delete_inode   = cifs_delete_inode,  */  /* Do not need above two
 577         functions unless later we add lazy close of inodes or unless the
 578         kernel forgets to call us with the same number of releases (closes)
 579         as opens */
 580         .show_options = cifs_show_options,
 581         .umount_begin   = cifs_umount_begin,
 582         .remount_fs = cifs_remount,
 583 #ifdef CONFIG_CIFS_STATS2
 584         .show_stats = cifs_show_stats,
 585 #endif
 586 };
 587
 588 static int
 589 cifs_get_sb(struct file_system_type *fs_type,
 590             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 591 {
 592         int rc;
 593         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 594
 595         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 596
 597         if (IS_ERR(sb))
 598                 return PTR_ERR(sb);
 599
 600         sb->s_flags = flags;
 601
 602         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 603         if (rc) {
 604                 up_write(&sb->s_umount);
 605                 deactivate_super(sb);
 606                 return rc;
 607         }
 608         sb->s_flags |= MS_ACTIVE;
 609         return simple_set_mnt(mnt, sb);
 610 }
 611
 612 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 613                                    unsigned long nr_segs, loff_t pos)
 614 {
 615         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 616         ssize_t written;
 617
 618         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 619         if (!CIFS_I(inode)->clientCanCacheAll)
 620                 filemap_fdatawrite(inode->i_mapping);
 621         return written;
 622 }
 623
 624 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 625 {
 626         /* origin == SEEK_END => we must revalidate the cached file length */
 627         if (origin == SEEK_END) {
 628                 int retval;
 629
 630                 /* some applications poll for the file length in this strange
 631                    way so we must seek to end on non-oplocked files by
 632                    setting the revalidate time to zero */
 633                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 634
 635                 retval = cifs_revalidate(file->f_path.dentry);
 636                 if (retval < 0)
 637                         return (loff_t)retval;
 638         }
 639         return generic_file_llseek_unlocked(file, offset, origin);
 640 }
 641
 642 #ifdef CONFIG_CIFS_EXPERIMENTAL
 643 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 644 {
 645         /* note that this is called by vfs setlease with the BKL held
 646            although I doubt that BKL is needed here in cifs */
 647         struct inode *inode = file->f_path.dentry->d_inode;
 648
 649         if (!(S_ISREG(inode->i_mode)))
 650                 return -EINVAL;
 651
 652         /* check if file is oplocked */
 653         if (((arg == F_RDLCK) &&
 654                 (CIFS_I(inode)->clientCanCacheRead)) ||
 655             ((arg == F_WRLCK) &&
 656                 (CIFS_I(inode)->clientCanCacheAll)))
 657                 return generic_setlease(file, arg, lease);
 658         else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
 659                         !CIFS_I(inode)->clientCanCacheRead)
 660                 /* If the server claims to support oplock on this
 661                    file, then we still need to check oplock even
 662                    if the local_lease mount option is set, but there
 663                    are servers which do not support oplock for which
 664                    this mount option may be useful if the user
 665                    knows that the file won't be changed on the server
 666                    by anyone else */
 667                 return generic_setlease(file, arg, lease);
 668         else
 669                 return -EAGAIN;
 670 }
 671 #endif
 672
 673 struct file_system_type cifs_fs_type = {
 674         .owner = THIS_MODULE,
 675         .name = "cifs",
 676         .get_sb = cifs_get_sb,
 677         .kill_sb = kill_anon_super,
 678         /*  .fs_flags */
 679 };
 680 const struct inode_operations cifs_dir_inode_ops = {
 681         .create = cifs_create,
 682         .lookup = cifs_lookup,
 683         .getattr = cifs_getattr,
 684         .unlink = cifs_unlink,
 685         .link = cifs_hardlink,
 686         .mkdir = cifs_mkdir,
 687         .rmdir = cifs_rmdir,
 688         .rename = cifs_rename,
 689         .permission = cifs_permission,
 690 /*      revalidate:cifs_revalidate,   */
 691         .setattr = cifs_setattr,
 692         .symlink = cifs_symlink,
 693         .mknod   = cifs_mknod,
 694 #ifdef CONFIG_CIFS_XATTR
 695         .setxattr = cifs_setxattr,
 696         .getxattr = cifs_getxattr,
 697         .listxattr = cifs_listxattr,
 698         .removexattr = cifs_removexattr,
 699 #endif
 700 };
 701
 702 const struct inode_operations cifs_file_inode_ops = {
 703 /*      revalidate:cifs_revalidate, */
 704         .setattr = cifs_setattr,
 705         .getattr = cifs_getattr, /* do we need this anymore? */
 706         .rename = cifs_rename,
 707         .permission = cifs_permission,
 708 #ifdef CONFIG_CIFS_XATTR
 709         .setxattr = cifs_setxattr,
 710         .getxattr = cifs_getxattr,
 711         .listxattr = cifs_listxattr,
 712         .removexattr = cifs_removexattr,
 713 #endif
 714 };
 715
 716 const struct inode_operations cifs_symlink_inode_ops = {
 717         .readlink = generic_readlink,
 718         .follow_link = cifs_follow_link,
 719         .put_link = cifs_put_link,
 720         .permission = cifs_permission,
 721         /* BB add the following two eventually */
 722         /* revalidate: cifs_revalidate,
 723            setattr:    cifs_notify_change, *//* BB do we need notify change */
 724 #ifdef CONFIG_CIFS_XATTR
 725         .setxattr = cifs_setxattr,
 726         .getxattr = cifs_getxattr,
 727         .listxattr = cifs_listxattr,
 728         .removexattr = cifs_removexattr,
 729 #endif
 730 };
 731
 732 const struct file_operations cifs_file_ops = {
 733         .read = do_sync_read,
 734         .write = do_sync_write,
 735         .aio_read = generic_file_aio_read,
 736         .aio_write = cifs_file_aio_write,
 737         .open = cifs_open,
 738         .release = cifs_close,
 739         .lock = cifs_lock,
 740         .fsync = cifs_fsync,
 741         .flush = cifs_flush,
 742         .mmap  = cifs_file_mmap,
 743         .splice_read = generic_file_splice_read,
 744         .llseek = cifs_llseek,
 745 #ifdef CONFIG_CIFS_POSIX
 746         .unlocked_ioctl = cifs_ioctl,
 747 #endif /* CONFIG_CIFS_POSIX */
 748
 749 #ifdef CONFIG_CIFS_EXPERIMENTAL
 750         .setlease = cifs_setlease,
 751 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 752 };
 753
 754 const struct file_operations cifs_file_direct_ops = {
 755         /* no mmap, no aio, no readv -
 756            BB reevaluate whether they can be done with directio, no cache */
 757         .read = cifs_user_read,
 758         .write = cifs_user_write,
 759         .open = cifs_open,
 760         .release = cifs_close,
 761         .lock = cifs_lock,
 762         .fsync = cifs_fsync,
 763         .flush = cifs_flush,
 764         .splice_read = generic_file_splice_read,
 765 #ifdef CONFIG_CIFS_POSIX
 766         .unlocked_ioctl  = cifs_ioctl,
 767 #endif /* CONFIG_CIFS_POSIX */
 768         .llseek = cifs_llseek,
 769 #ifdef CONFIG_CIFS_EXPERIMENTAL
 770         .setlease = cifs_setlease,
 771 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 772 };
 773 const struct file_operations cifs_file_nobrl_ops = {
 774         .read = do_sync_read,
 775         .write = do_sync_write,
 776         .aio_read = generic_file_aio_read,
 777         .aio_write = cifs_file_aio_write,
 778         .open = cifs_open,
 779         .release = cifs_close,
 780         .fsync = cifs_fsync,
 781         .flush = cifs_flush,
 782         .mmap  = cifs_file_mmap,
 783         .splice_read = generic_file_splice_read,
 784         .llseek = cifs_llseek,
 785 #ifdef CONFIG_CIFS_POSIX
 786         .unlocked_ioctl = cifs_ioctl,
 787 #endif /* CONFIG_CIFS_POSIX */
 788
 789 #ifdef CONFIG_CIFS_EXPERIMENTAL
 790         .setlease = cifs_setlease,
 791 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 792 };
 793
 794 const struct file_operations cifs_file_direct_nobrl_ops = {
 795         /* no mmap, no aio, no readv -
 796            BB reevaluate whether they can be done with directio, no cache */
 797         .read = cifs_user_read,
 798         .write = cifs_user_write,
 799         .open = cifs_open,
 800         .release = cifs_close,
 801         .fsync = cifs_fsync,
 802         .flush = cifs_flush,
 803         .splice_read = generic_file_splice_read,
 804 #ifdef CONFIG_CIFS_POSIX
 805         .unlocked_ioctl  = cifs_ioctl,
 806 #endif /* CONFIG_CIFS_POSIX */
 807         .llseek = cifs_llseek,
 808 #ifdef CONFIG_CIFS_EXPERIMENTAL
 809         .setlease = cifs_setlease,
 810 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 811 };
 812
 813 const struct file_operations cifs_dir_ops = {
 814         .readdir = cifs_readdir,
 815         .release = cifs_closedir,
 816         .read    = generic_read_dir,
 817         .unlocked_ioctl  = cifs_ioctl,
 818         .llseek = generic_file_llseek,
 819 };
 820
 821 static void
 822 cifs_init_once(void *inode)
 823 {
 824         struct cifsInodeInfo *cifsi = inode;
 825
 826         inode_init_once(&cifsi->vfs_inode);
 827         INIT_LIST_HEAD(&cifsi->lockList);
 828 }
 829
 830 static int
 831 cifs_init_inodecache(void)
 832 {
 833         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 834                                               sizeof(struct cifsInodeInfo),
 835                                               0, (SLAB_RECLAIM_ACCOUNT|
 836                                                 SLAB_MEM_SPREAD),
 837                                               cifs_init_once);
 838         if (cifs_inode_cachep == NULL)
 839                 return -ENOMEM;
 840
 841         return 0;
 842 }
 843
 844 static void
 845 cifs_destroy_inodecache(void)
 846 {
 847         kmem_cache_destroy(cifs_inode_cachep);
 848 }
 849
 850 static int
 851 cifs_init_request_bufs(void)
 852 {
 853         if (CIFSMaxBufSize < 8192) {
 854         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 855         Unicode path name has to fit in any SMB/CIFS path based frames */
 856                 CIFSMaxBufSize = 8192;
 857         } else if (CIFSMaxBufSize > 1024*127) {
 858                 CIFSMaxBufSize = 1024 * 127;
 859         } else {
 860                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 861         }
 862 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 863         cifs_req_cachep = kmem_cache_create("cifs_request",
 864                                             CIFSMaxBufSize +
 865                                             MAX_CIFS_HDR_SIZE, 0,
 866                                             SLAB_HWCACHE_ALIGN, NULL);
 867         if (cifs_req_cachep == NULL)
 868                 return -ENOMEM;
 869
 870         if (cifs_min_rcv < 1)
 871                 cifs_min_rcv = 1;
 872         else if (cifs_min_rcv > 64) {
 873                 cifs_min_rcv = 64;
 874                 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
 875         }
 876
 877         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 878                                                   cifs_req_cachep);
 879
 880         if (cifs_req_poolp == NULL) {
 881                 kmem_cache_destroy(cifs_req_cachep);
 882                 return -ENOMEM;
 883         }
 884         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 885         almost all handle based requests (but not write response, nor is it
 886         sufficient for path based requests).  A smaller size would have
 887         been more efficient (compacting multiple slab items on one 4k page)
 888         for the case in which debug was on, but this larger size allows
 889         more SMBs to use small buffer alloc and is still much more
 890         efficient to alloc 1 per page off the slab compared to 17K (5page)
 891         alloc of large cifs buffers even when page debugging is on */
 892         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 893                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 894                         NULL);
 895         if (cifs_sm_req_cachep == NULL) {
 896                 mempool_destroy(cifs_req_poolp);
 897                 kmem_cache_destroy(cifs_req_cachep);
 898                 return -ENOMEM;
 899         }
 900
 901         if (cifs_min_small < 2)
 902                 cifs_min_small = 2;
 903         else if (cifs_min_small > 256) {
 904                 cifs_min_small = 256;
 905                 cFYI(1, ("cifs_min_small set to maximum (256)"));
 906         }
 907
 908         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 909                                                      cifs_sm_req_cachep);
 910
 911         if (cifs_sm_req_poolp == NULL) {
 912                 mempool_destroy(cifs_req_poolp);
 913                 kmem_cache_destroy(cifs_req_cachep);
 914                 kmem_cache_destroy(cifs_sm_req_cachep);
 915                 return -ENOMEM;
 916         }
 917
 918         return 0;
 919 }
 920
 921 static void
 922 cifs_destroy_request_bufs(void)
 923 {
 924         mempool_destroy(cifs_req_poolp);
 925         kmem_cache_destroy(cifs_req_cachep);
 926         mempool_destroy(cifs_sm_req_poolp);
 927         kmem_cache_destroy(cifs_sm_req_cachep);
 928 }
 929
 930 static int
 931 cifs_init_mids(void)
 932 {
 933         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 934                                             sizeof(struct mid_q_entry), 0,
 935                                             SLAB_HWCACHE_ALIGN, NULL);
 936         if (cifs_mid_cachep == NULL)
 937                 return -ENOMEM;
 938
 939         /* 3 is a reasonable minimum number of simultaneous operations */
 940         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 941         if (cifs_mid_poolp == NULL) {
 942                 kmem_cache_destroy(cifs_mid_cachep);
 943                 return -ENOMEM;
 944         }
 945
 946         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 947                                         sizeof(struct oplock_q_entry), 0,
 948                                         SLAB_HWCACHE_ALIGN, NULL);
 949         if (cifs_oplock_cachep == NULL) {
 950                 mempool_destroy(cifs_mid_poolp);
 951                 kmem_cache_destroy(cifs_mid_cachep);
 952                 return -ENOMEM;
 953         }
 954
 955         return 0;
 956 }
 957
 958 static void
 959 cifs_destroy_mids(void)
 960 {
 961         mempool_destroy(cifs_mid_poolp);
 962         kmem_cache_destroy(cifs_mid_cachep);
 963         kmem_cache_destroy(cifs_oplock_cachep);
 964 }
 965
 966 static int cifs_oplock_thread(void *dummyarg)
 967 {
 968         struct oplock_q_entry *oplock_item;
 969         struct cifsTconInfo *pTcon;
 970         struct inode *inode;
 971         __u16  netfid;
 972         int rc, waitrc = 0;
 973
 974         set_freezable();
 975         do {
 976                 if (try_to_freeze())
 977                         continue;
 978
 979                 spin_lock(&GlobalMid_Lock);
 980                 if (list_empty(&GlobalOplock_Q)) {
 981                         spin_unlock(&GlobalMid_Lock);
 982                         set_current_state(TASK_INTERRUPTIBLE);
 983                         schedule_timeout(39*HZ);
 984                 } else {
 985                         oplock_item = list_entry(GlobalOplock_Q.next,
 986                                                 struct oplock_q_entry, qhead);
 987                         cFYI(1, ("found oplock item to write out"));
 988                         pTcon = oplock_item->tcon;
 989                         inode = oplock_item->pinode;
 990                         netfid = oplock_item->netfid;
 991                         spin_unlock(&GlobalMid_Lock);
 992                         DeleteOplockQEntry(oplock_item);
 993                         /* can not grab inode sem here since it would
 994                                 deadlock when oplock received on delete
 995                                 since vfs_unlink holds the i_mutex across
 996                                 the call */
 997                         /* mutex_lock(&inode->i_mutex);*/
 998                         if (S_ISREG(inode->i_mode)) {
 999 #ifdef CONFIG_CIFS_EXPERIMENTAL
1000                                 if (CIFS_I(inode)->clientCanCacheAll == 0)
1001                                         break_lease(inode, FMODE_READ);
1002                                 else if (CIFS_I(inode)->clientCanCacheRead == 0)
1003                                         break_lease(inode, FMODE_WRITE);
1004 #endif
1005                                 rc = filemap_fdatawrite(inode->i_mapping);
1006                                 if (CIFS_I(inode)->clientCanCacheRead == 0) {
1007                                         waitrc = filemap_fdatawait(
1008                                                               inode->i_mapping);
1009                                         invalidate_remote_inode(inode);
1010                                 }
1011                                 if (rc == 0)
1012                                         rc = waitrc;
1013                         } else
1014                                 rc = 0;
1015                         /* mutex_unlock(&inode->i_mutex);*/
1016                         if (rc)
1017                                 CIFS_I(inode)->write_behind_rc = rc;
1018                         cFYI(1, ("Oplock flush inode %p rc %d",
1019                                 inode, rc));
1020
1021                                 /* releasing stale oplock after recent reconnect
1022                                 of smb session using a now incorrect file
1023                                 handle is not a data integrity issue but do
1024                                 not bother sending an oplock release if session
1025                                 to server still is disconnected since oplock
1026                                 already released by the server in that case */
1027                         if (!pTcon->need_reconnect) {
1028                                 rc = CIFSSMBLock(0, pTcon, netfid,
1029                                                 0 /* len */ , 0 /* offset */, 0,
1030                                                 0, LOCKING_ANDX_OPLOCK_RELEASE,
1031                                                 false /* wait flag */);
1032                                 cFYI(1, ("Oplock release rc = %d", rc));
1033                         }
1034                         set_current_state(TASK_INTERRUPTIBLE);
1035                         schedule_timeout(1);  /* yield in case q were corrupt */
1036                 }
1037         } while (!kthread_should_stop());
1038
1039         return 0;
1040 }
1041
1042 #ifdef CONFIG_CIFS_EXPERIMENTAL
1043 static int cifs_dnotify_thread(void *dummyarg)
1044 {
1045         struct list_head *tmp;
1046         struct TCP_Server_Info *server;
1047
1048         do {
1049                 if (try_to_freeze())
1050                         continue;
1051                 set_current_state(TASK_INTERRUPTIBLE);
1052                 schedule_timeout(15*HZ);
1053                 /* check if any stuck requests that need
1054                    to be woken up and wakeq so the
1055                    thread can wake up and error out */
1056                 read_lock(&cifs_tcp_ses_lock);
1057                 list_for_each(tmp, &cifs_tcp_ses_list) {
1058                         server = list_entry(tmp, struct TCP_Server_Info,
1059                                          tcp_ses_list);
1060                         if (atomic_read(&server->inFlight))
1061                                 wake_up_all(&server->response_q);
1062                 }
1063                 read_unlock(&cifs_tcp_ses_lock);
1064         } while (!kthread_should_stop());
1065
1066         return 0;
1067 }
1068 #endif
1069
1070 static int __init
1071 init_cifs(void)
1072 {
1073         int rc = 0;
1074         cifs_proc_init();
1075         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1076         INIT_LIST_HEAD(&GlobalOplock_Q);
1077 #ifdef CONFIG_CIFS_EXPERIMENTAL
1078         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1079         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1080 #endif
1081 /*
1082  *  Initialize Global counters
1083  */
1084         atomic_set(&sesInfoAllocCount, 0);
1085         atomic_set(&tconInfoAllocCount, 0);
1086         atomic_set(&tcpSesAllocCount, 0);
1087         atomic_set(&tcpSesReconnectCount, 0);
1088         atomic_set(&tconInfoReconnectCount, 0);
1089
1090         atomic_set(&bufAllocCount, 0);
1091         atomic_set(&smBufAllocCount, 0);
1092 #ifdef CONFIG_CIFS_STATS2
1093         atomic_set(&totBufAllocCount, 0);
1094         atomic_set(&totSmBufAllocCount, 0);
1095 #endif /* CONFIG_CIFS_STATS2 */
1096
1097         atomic_set(&midCount, 0);
1098         GlobalCurrentXid = 0;
1099         GlobalTotalActiveXid = 0;
1100         GlobalMaxActiveXid = 0;
1101         memset(Local_System_Name, 0, 15);
1102         rwlock_init(&GlobalSMBSeslock);
1103         rwlock_init(&cifs_tcp_ses_lock);
1104         spin_lock_init(&GlobalMid_Lock);
1105
1106         if (cifs_max_pending < 2) {
1107                 cifs_max_pending = 2;
1108                 cFYI(1, ("cifs_max_pending set to min of 2"));
1109         } else if (cifs_max_pending > 256) {
1110                 cifs_max_pending = 256;
1111                 cFYI(1, ("cifs_max_pending set to max of 256"));
1112         }
1113
1114         rc = cifs_init_inodecache();
1115         if (rc)
1116                 goto out_clean_proc;
1117
1118         rc = cifs_init_mids();
1119         if (rc)
1120                 goto out_destroy_inodecache;
1121
1122         rc = cifs_init_request_bufs();
1123         if (rc)
1124                 goto out_destroy_mids;
1125
1126         rc = register_filesystem(&cifs_fs_type);
1127         if (rc)
1128                 goto out_destroy_request_bufs;
1129 #ifdef CONFIG_CIFS_UPCALL
1130         rc = register_key_type(&cifs_spnego_key_type);
1131         if (rc)
1132                 goto out_unregister_filesystem;
1133 #endif
1134 #ifdef CONFIG_CIFS_DFS_UPCALL
1135         rc = register_key_type(&key_type_dns_resolver);
1136         if (rc)
1137                 goto out_unregister_key_type;
1138 #endif
1139         oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1140         if (IS_ERR(oplockThread)) {
1141                 rc = PTR_ERR(oplockThread);
1142                 cERROR(1, ("error %d create oplock thread", rc));
1143                 goto out_unregister_dfs_key_type;
1144         }
1145
1146 #ifdef CONFIG_CIFS_EXPERIMENTAL
1147         dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1148         if (IS_ERR(dnotifyThread)) {
1149                 rc = PTR_ERR(dnotifyThread);
1150                 cERROR(1, ("error %d create dnotify thread", rc));
1151                 goto out_stop_oplock_thread;
1152         }
1153 #endif
1154
1155         return 0;
1156
1157 #ifdef CONFIG_CIFS_EXPERIMENTAL
1158  out_stop_oplock_thread:
1159 #endif
1160         kthread_stop(oplockThread);
1161  out_unregister_dfs_key_type:
1162 #ifdef CONFIG_CIFS_DFS_UPCALL
1163         unregister_key_type(&key_type_dns_resolver);
1164  out_unregister_key_type:
1165 #endif
1166 #ifdef CONFIG_CIFS_UPCALL
1167         unregister_key_type(&cifs_spnego_key_type);
1168  out_unregister_filesystem:
1169 #endif
1170         unregister_filesystem(&cifs_fs_type);
1171  out_destroy_request_bufs:
1172         cifs_destroy_request_bufs();
1173  out_destroy_mids:
1174         cifs_destroy_mids();
1175  out_destroy_inodecache:
1176         cifs_destroy_inodecache();
1177  out_clean_proc:
1178         cifs_proc_clean();
1179         return rc;
1180 }
1181
1182 static void __exit
1183 exit_cifs(void)
1184 {
1185         cFYI(DBG2, ("exit_cifs"));
1186         cifs_proc_clean();
1187 #ifdef CONFIG_CIFS_DFS_UPCALL
1188         cifs_dfs_release_automount_timer();
1189         unregister_key_type(&key_type_dns_resolver);
1190 #endif
1191 #ifdef CONFIG_CIFS_UPCALL
1192         unregister_key_type(&cifs_spnego_key_type);
1193 #endif
1194         unregister_filesystem(&cifs_fs_type);
1195         cifs_destroy_inodecache();
1196         cifs_destroy_mids();
1197         cifs_destroy_request_bufs();
1198 #ifdef CONFIG_CIFS_EXPERIMENTAL
1199         kthread_stop(dnotifyThread);
1200 #endif
1201         kthread_stop(oplockThread);
1202 }
1203
1204 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1205 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1206 MODULE_DESCRIPTION
1207     ("VFS to access servers complying with the SNIA CIFS Specification "
1208      "e.g. Samba and Windows");
1209 MODULE_VERSION(CIFS_VERSION);
1210 module_init(init_cifs)
1211 module_exit(exit_cifs)