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         cifs_inode->server_eof = 0;
 320
 321         /* Can not set i_flags here - they get immediately overwritten
 322            to zero by the VFS */
 323 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 324         INIT_LIST_HEAD(&cifs_inode->openFileList);
 325         return &cifs_inode->vfs_inode;
 326 }
 327
 328 static void
 329 cifs_destroy_inode(struct inode *inode)
 330 {
 331         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 332 }
 333
 334 /*
 335  * cifs_show_options() is for displaying mount options in /proc/mounts.
 336  * Not all settable options are displayed but most of the important
 337  * ones are.
 338  */
 339 static int
 340 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 341 {
 342         struct cifs_sb_info *cifs_sb;
 343         struct cifsTconInfo *tcon;
 344         struct TCP_Server_Info *server;
 345
 346         cifs_sb = CIFS_SB(m->mnt_sb);
 347
 348         if (cifs_sb) {
 349                 tcon = cifs_sb->tcon;
 350                 if (tcon) {
 351                         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 352                         if (tcon->ses) {
 353                                 if (tcon->ses->userName)
 354                                         seq_printf(s, ",username=%s",
 355                                            tcon->ses->userName);
 356                                 if (tcon->ses->domainName)
 357                                         seq_printf(s, ",domain=%s",
 358                                            tcon->ses->domainName);
 359                                 server = tcon->ses->server;
 360                                 if (server) {
 361                                         seq_printf(s, ",addr=");
 362                                         switch (server->addr.sockAddr6.
 363                                                 sin6_family) {
 364                                         case AF_INET6:
 365                                                 seq_printf(s, "%pI6",
 366                                                            &server->addr.sockAddr6.sin6_addr);
 367                                                 break;
 368                                         case AF_INET:
 369                                                 seq_printf(s, "%pI4",
 370                                                            &server->addr.sockAddr.sin_addr.s_addr);
 371                                                 break;
 372                                         }
 373                                 }
 374                         }
 375                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||
 376                            !(tcon->unix_ext))
 377                                 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 378                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||
 379                            !(tcon->unix_ext))
 380                                 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 381                         if (!tcon->unix_ext) {
 382                                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 383                                            cifs_sb->mnt_file_mode,
 384                                            cifs_sb->mnt_dir_mode);
 385                         }
 386                         if (tcon->seal)
 387                                 seq_printf(s, ",seal");
 388                         if (tcon->nocase)
 389                                 seq_printf(s, ",nocase");
 390                         if (tcon->retry)
 391                                 seq_printf(s, ",hard");
 392                 }
 393                 if (cifs_sb->prepath)
 394                         seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 395                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 396                         seq_printf(s, ",posixpaths");
 397                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 398                         seq_printf(s, ",setuids");
 399                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 400                         seq_printf(s, ",serverino");
 401                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 402                         seq_printf(s, ",directio");
 403                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 404                         seq_printf(s, ",nouser_xattr");
 405                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 406                         seq_printf(s, ",mapchars");
 407                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 408                         seq_printf(s, ",sfu");
 409                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 410                         seq_printf(s, ",nobrl");
 411                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 412                         seq_printf(s, ",cifsacl");
 413                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 414                         seq_printf(s, ",dynperm");
 415                 if (m->mnt_sb->s_flags & MS_POSIXACL)
 416                         seq_printf(s, ",acl");
 417
 418                 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 419                 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 420         }
 421         return 0;
 422 }
 423
 424 #ifdef CONFIG_CIFS_QUOTA
 425 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
 426                 struct fs_disk_quota *pdquota)
 427 {
 428         int xid;
 429         int rc = 0;
 430         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 431         struct cifsTconInfo *pTcon;
 432
 433         if (cifs_sb)
 434                 pTcon = cifs_sb->tcon;
 435         else
 436                 return -EIO;
 437
 438
 439         xid = GetXid();
 440         if (pTcon) {
 441                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 442         } else
 443                 rc = -EIO;
 444
 445         FreeXid(xid);
 446         return rc;
 447 }
 448
 449 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
 450                     struct fs_disk_quota *pdquota)
 451 {
 452         int xid;
 453         int rc = 0;
 454         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 455         struct cifsTconInfo *pTcon;
 456
 457         if (cifs_sb)
 458                 pTcon = cifs_sb->tcon;
 459         else
 460                 return -EIO;
 461
 462         xid = GetXid();
 463         if (pTcon) {
 464                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 465         } else
 466                 rc = -EIO;
 467
 468         FreeXid(xid);
 469         return rc;
 470 }
 471
 472 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
 473 {
 474         int xid;
 475         int rc = 0;
 476         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 477         struct cifsTconInfo *pTcon;
 478
 479         if (cifs_sb)
 480                 pTcon = cifs_sb->tcon;
 481         else
 482                 return -EIO;
 483
 484         xid = GetXid();
 485         if (pTcon) {
 486                 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
 487         } else
 488                 rc = -EIO;
 489
 490         FreeXid(xid);
 491         return rc;
 492 }
 493
 494 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
 495 {
 496         int xid;
 497         int rc = 0;
 498         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 499         struct cifsTconInfo *pTcon;
 500
 501         if (cifs_sb)
 502                 pTcon = cifs_sb->tcon;
 503         else
 504                 return -EIO;
 505
 506         xid = GetXid();
 507         if (pTcon) {
 508                 cFYI(1, ("pqstats %p", qstats));
 509         } else
 510                 rc = -EIO;
 511
 512         FreeXid(xid);
 513         return rc;
 514 }
 515
 516 static struct quotactl_ops cifs_quotactl_ops = {
 517         .set_xquota     = cifs_xquota_set,
 518         .get_xquota     = cifs_xquota_get,
 519         .set_xstate     = cifs_xstate_set,
 520         .get_xstate     = cifs_xstate_get,
 521 };
 522 #endif
 523
 524 static void cifs_umount_begin(struct super_block *sb)
 525 {
 526         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 527         struct cifsTconInfo *tcon;
 528
 529         if (cifs_sb == NULL)
 530                 return;
 531
 532         tcon = cifs_sb->tcon;
 533         if (tcon == NULL)
 534                 return;
 535
 536         read_lock(&cifs_tcp_ses_lock);
 537         if (tcon->tc_count == 1)
 538                 tcon->tidStatus = CifsExiting;
 539         read_unlock(&cifs_tcp_ses_lock);
 540
 541         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 542         /* cancel_notify_requests(tcon); */
 543         if (tcon->ses && tcon->ses->server) {
 544                 cFYI(1, ("wake up tasks now - umount begin not complete"));
 545                 wake_up_all(&tcon->ses->server->request_q);
 546                 wake_up_all(&tcon->ses->server->response_q);
 547                 msleep(1); /* yield */
 548                 /* we have to kick the requests once more */
 549                 wake_up_all(&tcon->ses->server->response_q);
 550                 msleep(1);
 551         }
 552 /* BB FIXME - finish add checks for tidStatus BB */
 553
 554         return;
 555 }
 556
 557 #ifdef CONFIG_CIFS_STATS2
 558 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 559 {
 560         /* BB FIXME */
 561         return 0;
 562 }
 563 #endif
 564
 565 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 566 {
 567         *flags |= MS_NODIRATIME;
 568         return 0;
 569 }
 570
 571 static const struct super_operations cifs_super_ops = {
 572         .put_super = cifs_put_super,
 573         .statfs = cifs_statfs,
 574         .alloc_inode = cifs_alloc_inode,
 575         .destroy_inode = cifs_destroy_inode,
 576 /*      .drop_inode         = generic_delete_inode,
 577         .delete_inode   = cifs_delete_inode,  */  /* Do not need above two
 578         functions unless later we add lazy close of inodes or unless the
 579         kernel forgets to call us with the same number of releases (closes)
 580         as opens */
 581         .show_options = cifs_show_options,
 582         .umount_begin   = cifs_umount_begin,
 583         .remount_fs = cifs_remount,
 584 #ifdef CONFIG_CIFS_STATS2
 585         .show_stats = cifs_show_stats,
 586 #endif
 587 };
 588
 589 static int
 590 cifs_get_sb(struct file_system_type *fs_type,
 591             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 592 {
 593         int rc;
 594         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 595
 596         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 597
 598         if (IS_ERR(sb))
 599                 return PTR_ERR(sb);
 600
 601         sb->s_flags = flags;
 602
 603         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 604         if (rc) {
 605                 up_write(&sb->s_umount);
 606                 deactivate_super(sb);
 607                 return rc;
 608         }
 609         sb->s_flags |= MS_ACTIVE;
 610         simple_set_mnt(mnt, sb);
 611         return 0;
 612 }
 613
 614 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 615                                    unsigned long nr_segs, loff_t pos)
 616 {
 617         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 618         ssize_t written;
 619
 620         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 621         if (!CIFS_I(inode)->clientCanCacheAll)
 622                 filemap_fdatawrite(inode->i_mapping);
 623         return written;
 624 }
 625
 626 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 627 {
 628         /* origin == SEEK_END => we must revalidate the cached file length */
 629         if (origin == SEEK_END) {
 630                 int retval;
 631
 632                 /* some applications poll for the file length in this strange
 633                    way so we must seek to end on non-oplocked files by
 634                    setting the revalidate time to zero */
 635                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 636
 637                 retval = cifs_revalidate(file->f_path.dentry);
 638                 if (retval < 0)
 639                         return (loff_t)retval;
 640         }
 641         return generic_file_llseek_unlocked(file, offset, origin);
 642 }
 643
 644 #ifdef CONFIG_CIFS_EXPERIMENTAL
 645 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 646 {
 647         /* note that this is called by vfs setlease with the BKL held
 648            although I doubt that BKL is needed here in cifs */
 649         struct inode *inode = file->f_path.dentry->d_inode;
 650
 651         if (!(S_ISREG(inode->i_mode)))
 652                 return -EINVAL;
 653
 654         /* check if file is oplocked */
 655         if (((arg == F_RDLCK) &&
 656                 (CIFS_I(inode)->clientCanCacheRead)) ||
 657             ((arg == F_WRLCK) &&
 658                 (CIFS_I(inode)->clientCanCacheAll)))
 659                 return generic_setlease(file, arg, lease);
 660         else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
 661                         !CIFS_I(inode)->clientCanCacheRead)
 662                 /* If the server claims to support oplock on this
 663                    file, then we still need to check oplock even
 664                    if the local_lease mount option is set, but there
 665                    are servers which do not support oplock for which
 666                    this mount option may be useful if the user
 667                    knows that the file won't be changed on the server
 668                    by anyone else */
 669                 return generic_setlease(file, arg, lease);
 670         else
 671                 return -EAGAIN;
 672 }
 673 #endif
 674
 675 struct file_system_type cifs_fs_type = {
 676         .owner = THIS_MODULE,
 677         .name = "cifs",
 678         .get_sb = cifs_get_sb,
 679         .kill_sb = kill_anon_super,
 680         /*  .fs_flags */
 681 };
 682 const struct inode_operations cifs_dir_inode_ops = {
 683         .create = cifs_create,
 684         .lookup = cifs_lookup,
 685         .getattr = cifs_getattr,
 686         .unlink = cifs_unlink,
 687         .link = cifs_hardlink,
 688         .mkdir = cifs_mkdir,
 689         .rmdir = cifs_rmdir,
 690         .rename = cifs_rename,
 691         .permission = cifs_permission,
 692 /*      revalidate:cifs_revalidate,   */
 693         .setattr = cifs_setattr,
 694         .symlink = cifs_symlink,
 695         .mknod   = cifs_mknod,
 696 #ifdef CONFIG_CIFS_XATTR
 697         .setxattr = cifs_setxattr,
 698         .getxattr = cifs_getxattr,
 699         .listxattr = cifs_listxattr,
 700         .removexattr = cifs_removexattr,
 701 #endif
 702 };
 703
 704 const struct inode_operations cifs_file_inode_ops = {
 705 /*      revalidate:cifs_revalidate, */
 706         .setattr = cifs_setattr,
 707         .getattr = cifs_getattr, /* do we need this anymore? */
 708         .rename = cifs_rename,
 709         .permission = cifs_permission,
 710 #ifdef CONFIG_CIFS_XATTR
 711         .setxattr = cifs_setxattr,
 712         .getxattr = cifs_getxattr,
 713         .listxattr = cifs_listxattr,
 714         .removexattr = cifs_removexattr,
 715 #endif
 716 };
 717
 718 const struct inode_operations cifs_symlink_inode_ops = {
 719         .readlink = generic_readlink,
 720         .follow_link = cifs_follow_link,
 721         .put_link = cifs_put_link,
 722         .permission = cifs_permission,
 723         /* BB add the following two eventually */
 724         /* revalidate: cifs_revalidate,
 725            setattr:    cifs_notify_change, *//* BB do we need notify change */
 726 #ifdef CONFIG_CIFS_XATTR
 727         .setxattr = cifs_setxattr,
 728         .getxattr = cifs_getxattr,
 729         .listxattr = cifs_listxattr,
 730         .removexattr = cifs_removexattr,
 731 #endif
 732 };
 733
 734 const struct file_operations cifs_file_ops = {
 735         .read = do_sync_read,
 736         .write = do_sync_write,
 737         .aio_read = generic_file_aio_read,
 738         .aio_write = cifs_file_aio_write,
 739         .open = cifs_open,
 740         .release = cifs_close,
 741         .lock = cifs_lock,
 742         .fsync = cifs_fsync,
 743         .flush = cifs_flush,
 744         .mmap  = cifs_file_mmap,
 745         .splice_read = generic_file_splice_read,
 746         .llseek = cifs_llseek,
 747 #ifdef CONFIG_CIFS_POSIX
 748         .unlocked_ioctl = cifs_ioctl,
 749 #endif /* CONFIG_CIFS_POSIX */
 750
 751 #ifdef CONFIG_CIFS_EXPERIMENTAL
 752         .setlease = cifs_setlease,
 753 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 754 };
 755
 756 const struct file_operations cifs_file_direct_ops = {
 757         /* no mmap, no aio, no readv -
 758            BB reevaluate whether they can be done with directio, no cache */
 759         .read = cifs_user_read,
 760         .write = cifs_user_write,
 761         .open = cifs_open,
 762         .release = cifs_close,
 763         .lock = cifs_lock,
 764         .fsync = cifs_fsync,
 765         .flush = cifs_flush,
 766         .splice_read = generic_file_splice_read,
 767 #ifdef CONFIG_CIFS_POSIX
 768         .unlocked_ioctl  = cifs_ioctl,
 769 #endif /* CONFIG_CIFS_POSIX */
 770         .llseek = cifs_llseek,
 771 #ifdef CONFIG_CIFS_EXPERIMENTAL
 772         .setlease = cifs_setlease,
 773 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 774 };
 775 const struct file_operations cifs_file_nobrl_ops = {
 776         .read = do_sync_read,
 777         .write = do_sync_write,
 778         .aio_read = generic_file_aio_read,
 779         .aio_write = cifs_file_aio_write,
 780         .open = cifs_open,
 781         .release = cifs_close,
 782         .fsync = cifs_fsync,
 783         .flush = cifs_flush,
 784         .mmap  = cifs_file_mmap,
 785         .splice_read = generic_file_splice_read,
 786         .llseek = cifs_llseek,
 787 #ifdef CONFIG_CIFS_POSIX
 788         .unlocked_ioctl = cifs_ioctl,
 789 #endif /* CONFIG_CIFS_POSIX */
 790
 791 #ifdef CONFIG_CIFS_EXPERIMENTAL
 792         .setlease = cifs_setlease,
 793 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 794 };
 795
 796 const struct file_operations cifs_file_direct_nobrl_ops = {
 797         /* no mmap, no aio, no readv -
 798            BB reevaluate whether they can be done with directio, no cache */
 799         .read = cifs_user_read,
 800         .write = cifs_user_write,
 801         .open = cifs_open,
 802         .release = cifs_close,
 803         .fsync = cifs_fsync,
 804         .flush = cifs_flush,
 805         .splice_read = generic_file_splice_read,
 806 #ifdef CONFIG_CIFS_POSIX
 807         .unlocked_ioctl  = cifs_ioctl,
 808 #endif /* CONFIG_CIFS_POSIX */
 809         .llseek = cifs_llseek,
 810 #ifdef CONFIG_CIFS_EXPERIMENTAL
 811         .setlease = cifs_setlease,
 812 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 813 };
 814
 815 const struct file_operations cifs_dir_ops = {
 816         .readdir = cifs_readdir,
 817         .release = cifs_closedir,
 818         .read    = generic_read_dir,
 819         .unlocked_ioctl  = cifs_ioctl,
 820         .llseek = generic_file_llseek,
 821 };
 822
 823 static void
 824 cifs_init_once(void *inode)
 825 {
 826         struct cifsInodeInfo *cifsi = inode;
 827
 828         inode_init_once(&cifsi->vfs_inode);
 829         INIT_LIST_HEAD(&cifsi->lockList);
 830 }
 831
 832 static int
 833 cifs_init_inodecache(void)
 834 {
 835         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 836                                               sizeof(struct cifsInodeInfo),
 837                                               0, (SLAB_RECLAIM_ACCOUNT|
 838                                                 SLAB_MEM_SPREAD),
 839                                               cifs_init_once);
 840         if (cifs_inode_cachep == NULL)
 841                 return -ENOMEM;
 842
 843         return 0;
 844 }
 845
 846 static void
 847 cifs_destroy_inodecache(void)
 848 {
 849         kmem_cache_destroy(cifs_inode_cachep);
 850 }
 851
 852 static int
 853 cifs_init_request_bufs(void)
 854 {
 855         if (CIFSMaxBufSize < 8192) {
 856         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 857         Unicode path name has to fit in any SMB/CIFS path based frames */
 858                 CIFSMaxBufSize = 8192;
 859         } else if (CIFSMaxBufSize > 1024*127) {
 860                 CIFSMaxBufSize = 1024 * 127;
 861         } else {
 862                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 863         }
 864 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 865         cifs_req_cachep = kmem_cache_create("cifs_request",
 866                                             CIFSMaxBufSize +
 867                                             MAX_CIFS_HDR_SIZE, 0,
 868                                             SLAB_HWCACHE_ALIGN, NULL);
 869         if (cifs_req_cachep == NULL)
 870                 return -ENOMEM;
 871
 872         if (cifs_min_rcv < 1)
 873                 cifs_min_rcv = 1;
 874         else if (cifs_min_rcv > 64) {
 875                 cifs_min_rcv = 64;
 876                 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
 877         }
 878
 879         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 880                                                   cifs_req_cachep);
 881
 882         if (cifs_req_poolp == NULL) {
 883                 kmem_cache_destroy(cifs_req_cachep);
 884                 return -ENOMEM;
 885         }
 886         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 887         almost all handle based requests (but not write response, nor is it
 888         sufficient for path based requests).  A smaller size would have
 889         been more efficient (compacting multiple slab items on one 4k page)
 890         for the case in which debug was on, but this larger size allows
 891         more SMBs to use small buffer alloc and is still much more
 892         efficient to alloc 1 per page off the slab compared to 17K (5page)
 893         alloc of large cifs buffers even when page debugging is on */
 894         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 895                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 896                         NULL);
 897         if (cifs_sm_req_cachep == NULL) {
 898                 mempool_destroy(cifs_req_poolp);
 899                 kmem_cache_destroy(cifs_req_cachep);
 900                 return -ENOMEM;
 901         }
 902
 903         if (cifs_min_small < 2)
 904                 cifs_min_small = 2;
 905         else if (cifs_min_small > 256) {
 906                 cifs_min_small = 256;
 907                 cFYI(1, ("cifs_min_small set to maximum (256)"));
 908         }
 909
 910         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 911                                                      cifs_sm_req_cachep);
 912
 913         if (cifs_sm_req_poolp == NULL) {
 914                 mempool_destroy(cifs_req_poolp);
 915                 kmem_cache_destroy(cifs_req_cachep);
 916                 kmem_cache_destroy(cifs_sm_req_cachep);
 917                 return -ENOMEM;
 918         }
 919
 920         return 0;
 921 }
 922
 923 static void
 924 cifs_destroy_request_bufs(void)
 925 {
 926         mempool_destroy(cifs_req_poolp);
 927         kmem_cache_destroy(cifs_req_cachep);
 928         mempool_destroy(cifs_sm_req_poolp);
 929         kmem_cache_destroy(cifs_sm_req_cachep);
 930 }
 931
 932 static int
 933 cifs_init_mids(void)
 934 {
 935         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 936                                             sizeof(struct mid_q_entry), 0,
 937                                             SLAB_HWCACHE_ALIGN, NULL);
 938         if (cifs_mid_cachep == NULL)
 939                 return -ENOMEM;
 940
 941         /* 3 is a reasonable minimum number of simultaneous operations */
 942         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 943         if (cifs_mid_poolp == NULL) {
 944                 kmem_cache_destroy(cifs_mid_cachep);
 945                 return -ENOMEM;
 946         }
 947
 948         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 949                                         sizeof(struct oplock_q_entry), 0,
 950                                         SLAB_HWCACHE_ALIGN, NULL);
 951         if (cifs_oplock_cachep == NULL) {
 952                 mempool_destroy(cifs_mid_poolp);
 953                 kmem_cache_destroy(cifs_mid_cachep);
 954                 return -ENOMEM;
 955         }
 956
 957         return 0;
 958 }
 959
 960 static void
 961 cifs_destroy_mids(void)
 962 {
 963         mempool_destroy(cifs_mid_poolp);
 964         kmem_cache_destroy(cifs_mid_cachep);
 965         kmem_cache_destroy(cifs_oplock_cachep);
 966 }
 967
 968 static int cifs_oplock_thread(void *dummyarg)
 969 {
 970         struct oplock_q_entry *oplock_item;
 971         struct cifsTconInfo *pTcon;
 972         struct inode *inode;
 973         __u16  netfid;
 974         int rc, waitrc = 0;
 975
 976         set_freezable();
 977         do {
 978                 if (try_to_freeze())
 979                         continue;
 980
 981                 spin_lock(&GlobalMid_Lock);
 982                 if (list_empty(&GlobalOplock_Q)) {
 983                         spin_unlock(&GlobalMid_Lock);
 984                         set_current_state(TASK_INTERRUPTIBLE);
 985                         schedule_timeout(39*HZ);
 986                 } else {
 987                         oplock_item = list_entry(GlobalOplock_Q.next,
 988                                                 struct oplock_q_entry, qhead);
 989                         cFYI(1, ("found oplock item to write out"));
 990                         pTcon = oplock_item->tcon;
 991                         inode = oplock_item->pinode;
 992                         netfid = oplock_item->netfid;
 993                         spin_unlock(&GlobalMid_Lock);
 994                         DeleteOplockQEntry(oplock_item);
 995                         /* can not grab inode sem here since it would
 996                                 deadlock when oplock received on delete
 997                                 since vfs_unlink holds the i_mutex across
 998                                 the call */
 999                         /* mutex_lock(&inode->i_mutex);*/
1000                         if (S_ISREG(inode->i_mode)) {
1001 #ifdef CONFIG_CIFS_EXPERIMENTAL
1002                                 if (CIFS_I(inode)->clientCanCacheAll == 0)
1003                                         break_lease(inode, FMODE_READ);
1004                                 else if (CIFS_I(inode)->clientCanCacheRead == 0)
1005                                         break_lease(inode, FMODE_WRITE);
1006 #endif
1007                                 rc = filemap_fdatawrite(inode->i_mapping);
1008                                 if (CIFS_I(inode)->clientCanCacheRead == 0) {
1009                                         waitrc = filemap_fdatawait(
1010                                                               inode->i_mapping);
1011                                         invalidate_remote_inode(inode);
1012                                 }
1013                                 if (rc == 0)
1014                                         rc = waitrc;
1015                         } else
1016                                 rc = 0;
1017                         /* mutex_unlock(&inode->i_mutex);*/
1018                         if (rc)
1019                                 CIFS_I(inode)->write_behind_rc = rc;
1020                         cFYI(1, ("Oplock flush inode %p rc %d",
1021                                 inode, rc));
1022
1023                                 /* releasing stale oplock after recent reconnect
1024                                 of smb session using a now incorrect file
1025                                 handle is not a data integrity issue but do
1026                                 not bother sending an oplock release if session
1027                                 to server still is disconnected since oplock
1028                                 already released by the server in that case */
1029                         if (!pTcon->need_reconnect) {
1030                                 rc = CIFSSMBLock(0, pTcon, netfid,
1031                                                 0 /* len */ , 0 /* offset */, 0,
1032                                                 0, LOCKING_ANDX_OPLOCK_RELEASE,
1033                                                 false /* wait flag */);
1034                                 cFYI(1, ("Oplock release rc = %d", rc));
1035                         }
1036                         set_current_state(TASK_INTERRUPTIBLE);
1037                         schedule_timeout(1);  /* yield in case q were corrupt */
1038                 }
1039         } while (!kthread_should_stop());
1040
1041         return 0;
1042 }
1043
1044 #ifdef CONFIG_CIFS_EXPERIMENTAL
1045 static int cifs_dnotify_thread(void *dummyarg)
1046 {
1047         struct list_head *tmp;
1048         struct TCP_Server_Info *server;
1049
1050         do {
1051                 if (try_to_freeze())
1052                         continue;
1053                 set_current_state(TASK_INTERRUPTIBLE);
1054                 schedule_timeout(15*HZ);
1055                 /* check if any stuck requests that need
1056                    to be woken up and wakeq so the
1057                    thread can wake up and error out */
1058                 read_lock(&cifs_tcp_ses_lock);
1059                 list_for_each(tmp, &cifs_tcp_ses_list) {
1060                         server = list_entry(tmp, struct TCP_Server_Info,
1061                                          tcp_ses_list);
1062                         if (atomic_read(&server->inFlight))
1063                                 wake_up_all(&server->response_q);
1064                 }
1065                 read_unlock(&cifs_tcp_ses_lock);
1066         } while (!kthread_should_stop());
1067
1068         return 0;
1069 }
1070 #endif
1071
1072 static int __init
1073 init_cifs(void)
1074 {
1075         int rc = 0;
1076         cifs_proc_init();
1077         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1078         INIT_LIST_HEAD(&GlobalOplock_Q);
1079 #ifdef CONFIG_CIFS_EXPERIMENTAL
1080         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1081         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1082 #endif
1083 /*
1084  *  Initialize Global counters
1085  */
1086         atomic_set(&sesInfoAllocCount, 0);
1087         atomic_set(&tconInfoAllocCount, 0);
1088         atomic_set(&tcpSesAllocCount, 0);
1089         atomic_set(&tcpSesReconnectCount, 0);
1090         atomic_set(&tconInfoReconnectCount, 0);
1091
1092         atomic_set(&bufAllocCount, 0);
1093         atomic_set(&smBufAllocCount, 0);
1094 #ifdef CONFIG_CIFS_STATS2
1095         atomic_set(&totBufAllocCount, 0);
1096         atomic_set(&totSmBufAllocCount, 0);
1097 #endif /* CONFIG_CIFS_STATS2 */
1098
1099         atomic_set(&midCount, 0);
1100         GlobalCurrentXid = 0;
1101         GlobalTotalActiveXid = 0;
1102         GlobalMaxActiveXid = 0;
1103         memset(Local_System_Name, 0, 15);
1104         rwlock_init(&GlobalSMBSeslock);
1105         rwlock_init(&cifs_tcp_ses_lock);
1106         spin_lock_init(&GlobalMid_Lock);
1107
1108         if (cifs_max_pending < 2) {
1109                 cifs_max_pending = 2;
1110                 cFYI(1, ("cifs_max_pending set to min of 2"));
1111         } else if (cifs_max_pending > 256) {
1112                 cifs_max_pending = 256;
1113                 cFYI(1, ("cifs_max_pending set to max of 256"));
1114         }
1115
1116         rc = cifs_init_inodecache();
1117         if (rc)
1118                 goto out_clean_proc;
1119
1120         rc = cifs_init_mids();
1121         if (rc)
1122                 goto out_destroy_inodecache;
1123
1124         rc = cifs_init_request_bufs();
1125         if (rc)
1126                 goto out_destroy_mids;
1127
1128         rc = register_filesystem(&cifs_fs_type);
1129         if (rc)
1130                 goto out_destroy_request_bufs;
1131 #ifdef CONFIG_CIFS_UPCALL
1132         rc = register_key_type(&cifs_spnego_key_type);
1133         if (rc)
1134                 goto out_unregister_filesystem;
1135 #endif
1136 #ifdef CONFIG_CIFS_DFS_UPCALL
1137         rc = register_key_type(&key_type_dns_resolver);
1138         if (rc)
1139                 goto out_unregister_key_type;
1140 #endif
1141         oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1142         if (IS_ERR(oplockThread)) {
1143                 rc = PTR_ERR(oplockThread);
1144                 cERROR(1, ("error %d create oplock thread", rc));
1145                 goto out_unregister_dfs_key_type;
1146         }
1147
1148 #ifdef CONFIG_CIFS_EXPERIMENTAL
1149         dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1150         if (IS_ERR(dnotifyThread)) {
1151                 rc = PTR_ERR(dnotifyThread);
1152                 cERROR(1, ("error %d create dnotify thread", rc));
1153                 goto out_stop_oplock_thread;
1154         }
1155 #endif
1156
1157         return 0;
1158
1159 #ifdef CONFIG_CIFS_EXPERIMENTAL
1160  out_stop_oplock_thread:
1161 #endif
1162         kthread_stop(oplockThread);
1163  out_unregister_dfs_key_type:
1164 #ifdef CONFIG_CIFS_DFS_UPCALL
1165         unregister_key_type(&key_type_dns_resolver);
1166  out_unregister_key_type:
1167 #endif
1168 #ifdef CONFIG_CIFS_UPCALL
1169         unregister_key_type(&cifs_spnego_key_type);
1170  out_unregister_filesystem:
1171 #endif
1172         unregister_filesystem(&cifs_fs_type);
1173  out_destroy_request_bufs:
1174         cifs_destroy_request_bufs();
1175  out_destroy_mids:
1176         cifs_destroy_mids();
1177  out_destroy_inodecache:
1178         cifs_destroy_inodecache();
1179  out_clean_proc:
1180         cifs_proc_clean();
1181         return rc;
1182 }
1183
1184 static void __exit
1185 exit_cifs(void)
1186 {
1187         cFYI(DBG2, ("exit_cifs"));
1188         cifs_proc_clean();
1189 #ifdef CONFIG_CIFS_DFS_UPCALL
1190         cifs_dfs_release_automount_timer();
1191         unregister_key_type(&key_type_dns_resolver);
1192 #endif
1193 #ifdef CONFIG_CIFS_UPCALL
1194         unregister_key_type(&cifs_spnego_key_type);
1195 #endif
1196         unregister_filesystem(&cifs_fs_type);
1197         cifs_destroy_inodecache();
1198         cifs_destroy_mids();
1199         cifs_destroy_request_bufs();
1200 #ifdef CONFIG_CIFS_EXPERIMENTAL
1201         kthread_stop(dnotifyThread);
1202 #endif
1203         kthread_stop(oplockThread);
1204 }
1205
1206 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1207 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1208 MODULE_DESCRIPTION
1209     ("VFS to access servers complying with the SNIA CIFS Specification "
1210      "e.g. Samba and Windows");
1211 MODULE_VERSION(CIFS_VERSION);
1212 module_init(init_cifs)
1213 module_exit(exit_cifs)