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