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         struct cifsTconInfo *tcon;
 341         struct TCP_Server_Info *server;
 342
 343         cifs_sb = CIFS_SB(m->mnt_sb);
 344
 345         if (cifs_sb) {
 346                 tcon = cifs_sb->tcon;
 347                 if (tcon) {
 348 /* BB add prepath to mount options displayed */
 349                         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 350                         if (tcon->ses) {
 351                                 if (tcon->ses->userName)
 352                                         seq_printf(s, ",username=%s",
 353                                            tcon->ses->userName);
 354                                 if (tcon->ses->domainName)
 355                                         seq_printf(s, ",domain=%s",
 356                                            tcon->ses->domainName);
 357                                 server = tcon->ses->server;
 358                                 if (server) {
 359                                         seq_printf(s, ",addr=");
 360                                         switch (server->addr.sockAddr6.
 361                                                 sin6_family) {
 362                                         case AF_INET6:
 363                                                 seq_printf(s, NIP6_FMT,
 364                                                            NIP6(server->addr.sockAddr6.sin6_addr));
 365                                                 break;
 366                                         case AF_INET:
 367                                                 seq_printf(s, NIPQUAD_FMT,
 368                                                            NIPQUAD(server->addr.sockAddr.sin_addr.s_addr));
 369                                                 break;
 370                                         }
 371                                 }
 372                         }
 373                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||
 374                            !(tcon->unix_ext))
 375                                 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 376                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||
 377                            !(tcon->unix_ext))
 378                                 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 379                         if (!tcon->unix_ext) {
 380                                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 381                                            cifs_sb->mnt_file_mode,
 382                                            cifs_sb->mnt_dir_mode);
 383                         }
 384                         if (tcon->seal)
 385                                 seq_printf(s, ",seal");
 386                         if (tcon->nocase)
 387                                 seq_printf(s, ",nocase");
 388                         if (tcon->retry)
 389                                 seq_printf(s, ",hard");
 390                 }
 391                 if (cifs_sb->prepath)
 392                         seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 393                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 394                         seq_printf(s, ",posixpaths");
 395                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 396                         seq_printf(s, ",setuids");
 397                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 398                         seq_printf(s, ",serverino");
 399                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 400                         seq_printf(s, ",directio");
 401                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 402                         seq_printf(s, ",nouser_xattr");
 403                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 404                         seq_printf(s, ",mapchars");
 405                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 406                         seq_printf(s, ",sfu");
 407                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 408                         seq_printf(s, ",nobrl");
 409                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 410                         seq_printf(s, ",cifsacl");
 411                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 412                         seq_printf(s, ",dynperm");
 413                 if (m->mnt_sb->s_flags & MS_POSIXACL)
 414                         seq_printf(s, ",acl");
 415
 416                 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 417                 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 418         }
 419         return 0;
 420 }
 421
 422 #ifdef CONFIG_CIFS_QUOTA
 423 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
 424                 struct fs_disk_quota *pdquota)
 425 {
 426         int xid;
 427         int rc = 0;
 428         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 429         struct cifsTconInfo *pTcon;
 430
 431         if (cifs_sb)
 432                 pTcon = cifs_sb->tcon;
 433         else
 434                 return -EIO;
 435
 436
 437         xid = GetXid();
 438         if (pTcon) {
 439                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 440         } else {
 441                 rc = -EIO;
 442         }
 443
 444         FreeXid(xid);
 445         return rc;
 446 }
 447
 448 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
 449                     struct fs_disk_quota *pdquota)
 450 {
 451         int xid;
 452         int rc = 0;
 453         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 454         struct cifsTconInfo *pTcon;
 455
 456         if (cifs_sb)
 457                 pTcon = cifs_sb->tcon;
 458         else
 459                 return -EIO;
 460
 461         xid = GetXid();
 462         if (pTcon) {
 463                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 464         } else {
 465                 rc = -EIO;
 466         }
 467
 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
 491         FreeXid(xid);
 492         return rc;
 493 }
 494
 495 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
 496 {
 497         int xid;
 498         int rc = 0;
 499         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 500         struct cifsTconInfo *pTcon;
 501
 502         if (cifs_sb) {
 503                 pTcon = cifs_sb->tcon;
 504         } else {
 505                 return -EIO;
 506         }
 507         xid = GetXid();
 508         if (pTcon) {
 509                 cFYI(1, ("pqstats %p", qstats));
 510         } else {
 511                 rc = -EIO;
 512         }
 513
 514         FreeXid(xid);
 515         return rc;
 516 }
 517
 518 static struct quotactl_ops cifs_quotactl_ops = {
 519         .set_xquota     = cifs_xquota_set,
 520         .get_xquota     = cifs_xquota_get,
 521         .set_xstate     = cifs_xstate_set,
 522         .get_xstate     = cifs_xstate_get,
 523 };
 524 #endif
 525
 526 static void cifs_umount_begin(struct super_block *sb)
 527 {
 528         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 529         struct cifsTconInfo *tcon;
 530
 531         if (cifs_sb == NULL)
 532                 return;
 533
 534         tcon = cifs_sb->tcon;
 535         if (tcon == NULL)
 536                 return;
 537
 538         read_lock(&cifs_tcp_ses_lock);
 539         if (tcon->tc_count == 1)
 540                 tcon->tidStatus = CifsExiting;
 541         read_unlock(&cifs_tcp_ses_lock);
 542
 543         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 544         /* cancel_notify_requests(tcon); */
 545         if (tcon->ses && tcon->ses->server) {
 546                 cFYI(1, ("wake up tasks now - umount begin not complete"));
 547                 wake_up_all(&tcon->ses->server->request_q);
 548                 wake_up_all(&tcon->ses->server->response_q);
 549                 msleep(1); /* yield */
 550                 /* we have to kick the requests once more */
 551                 wake_up_all(&tcon->ses->server->response_q);
 552                 msleep(1);
 553         }
 554 /* BB FIXME - finish add checks for tidStatus BB */
 555
 556         return;
 557 }
 558
 559 #ifdef CONFIG_CIFS_STATS2
 560 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 561 {
 562         /* BB FIXME */
 563         return 0;
 564 }
 565 #endif
 566
 567 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 568 {
 569         *flags |= MS_NODIRATIME;
 570         return 0;
 571 }
 572
 573 static const struct super_operations cifs_super_ops = {
 574         .put_super = cifs_put_super,
 575         .statfs = cifs_statfs,
 576         .alloc_inode = cifs_alloc_inode,
 577         .destroy_inode = cifs_destroy_inode,
 578 /*      .drop_inode         = generic_delete_inode,
 579         .delete_inode   = cifs_delete_inode,  */  /* Do not need above two
 580         functions unless later we add lazy close of inodes or unless the
 581         kernel forgets to call us with the same number of releases (closes)
 582         as opens */
 583         .show_options = cifs_show_options,
 584         .umount_begin   = cifs_umount_begin,
 585         .remount_fs = cifs_remount,
 586 #ifdef CONFIG_CIFS_STATS2
 587         .show_stats = cifs_show_stats,
 588 #endif
 589 };
 590
 591 static int
 592 cifs_get_sb(struct file_system_type *fs_type,
 593             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 594 {
 595         int rc;
 596         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 597
 598         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 599
 600         if (IS_ERR(sb))
 601                 return PTR_ERR(sb);
 602
 603         sb->s_flags = flags;
 604
 605         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 606         if (rc) {
 607                 up_write(&sb->s_umount);
 608                 deactivate_super(sb);
 609                 return rc;
 610         }
 611         sb->s_flags |= MS_ACTIVE;
 612         return simple_set_mnt(mnt, sb);
 613 }
 614
 615 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 616                                    unsigned long nr_segs, loff_t pos)
 617 {
 618         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 619         ssize_t written;
 620
 621         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 622         if (!CIFS_I(inode)->clientCanCacheAll)
 623                 filemap_fdatawrite(inode->i_mapping);
 624         return written;
 625 }
 626
 627 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 628 {
 629         /* origin == SEEK_END => we must revalidate the cached file length */
 630         if (origin == SEEK_END) {
 631                 int retval;
 632
 633                 /* some applications poll for the file length in this strange
 634                    way so we must seek to end on non-oplocked files by
 635                    setting the revalidate time to zero */
 636                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 637
 638                 retval = cifs_revalidate(file->f_path.dentry);
 639                 if (retval < 0)
 640                         return (loff_t)retval;
 641         }
 642         return generic_file_llseek_unlocked(file, offset, origin);
 643 }
 644
 645 #ifdef CONFIG_CIFS_EXPERIMENTAL
 646 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 647 {
 648         /* note that this is called by vfs setlease with the BKL held
 649            although I doubt that BKL is needed here in cifs */
 650         struct inode *inode = file->f_path.dentry->d_inode;
 651
 652         if (!(S_ISREG(inode->i_mode)))
 653                 return -EINVAL;
 654
 655         /* check if file is oplocked */
 656         if (((arg == F_RDLCK) &&
 657                 (CIFS_I(inode)->clientCanCacheRead)) ||
 658             ((arg == F_WRLCK) &&
 659                 (CIFS_I(inode)->clientCanCacheAll)))
 660                 return generic_setlease(file, arg, lease);
 661         else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
 662                         !CIFS_I(inode)->clientCanCacheRead)
 663                 /* If the server claims to support oplock on this
 664                    file, then we still need to check oplock even
 665                    if the local_lease mount option is set, but there
 666                    are servers which do not support oplock for which
 667                    this mount option may be useful if the user
 668                    knows that the file won't be changed on the server
 669                    by anyone else */
 670                 return generic_setlease(file, arg, lease);
 671         else
 672                 return -EAGAIN;
 673 }
 674 #endif
 675
 676 struct file_system_type cifs_fs_type = {
 677         .owner = THIS_MODULE,
 678         .name = "cifs",
 679         .get_sb = cifs_get_sb,
 680         .kill_sb = kill_anon_super,
 681         /*  .fs_flags */
 682 };
 683 const struct inode_operations cifs_dir_inode_ops = {
 684         .create = cifs_create,
 685         .lookup = cifs_lookup,
 686         .getattr = cifs_getattr,
 687         .unlink = cifs_unlink,
 688         .link = cifs_hardlink,
 689         .mkdir = cifs_mkdir,
 690         .rmdir = cifs_rmdir,
 691         .rename = cifs_rename,
 692         .permission = cifs_permission,
 693 /*      revalidate:cifs_revalidate,   */
 694         .setattr = cifs_setattr,
 695         .symlink = cifs_symlink,
 696         .mknod   = cifs_mknod,
 697 #ifdef CONFIG_CIFS_XATTR
 698         .setxattr = cifs_setxattr,
 699         .getxattr = cifs_getxattr,
 700         .listxattr = cifs_listxattr,
 701         .removexattr = cifs_removexattr,
 702 #endif
 703 };
 704
 705 const struct inode_operations cifs_file_inode_ops = {
 706 /*      revalidate:cifs_revalidate, */
 707         .setattr = cifs_setattr,
 708         .getattr = cifs_getattr, /* do we need this anymore? */
 709         .rename = cifs_rename,
 710         .permission = cifs_permission,
 711 #ifdef CONFIG_CIFS_XATTR
 712         .setxattr = cifs_setxattr,
 713         .getxattr = cifs_getxattr,
 714         .listxattr = cifs_listxattr,
 715         .removexattr = cifs_removexattr,
 716 #endif
 717 };
 718
 719 const struct inode_operations cifs_symlink_inode_ops = {
 720         .readlink = generic_readlink,
 721         .follow_link = cifs_follow_link,
 722         .put_link = cifs_put_link,
 723         .permission = cifs_permission,
 724         /* BB add the following two eventually */
 725         /* revalidate: cifs_revalidate,
 726            setattr:    cifs_notify_change, *//* BB do we need notify change */
 727 #ifdef CONFIG_CIFS_XATTR
 728         .setxattr = cifs_setxattr,
 729         .getxattr = cifs_getxattr,
 730         .listxattr = cifs_listxattr,
 731         .removexattr = cifs_removexattr,
 732 #endif
 733 };
 734
 735 const struct file_operations cifs_file_ops = {
 736         .read = do_sync_read,
 737         .write = do_sync_write,
 738         .aio_read = generic_file_aio_read,
 739         .aio_write = cifs_file_aio_write,
 740         .open = cifs_open,
 741         .release = cifs_close,
 742         .lock = cifs_lock,
 743         .fsync = cifs_fsync,
 744         .flush = cifs_flush,
 745         .mmap  = cifs_file_mmap,
 746         .splice_read = generic_file_splice_read,
 747         .llseek = cifs_llseek,
 748 #ifdef CONFIG_CIFS_POSIX
 749         .unlocked_ioctl = cifs_ioctl,
 750 #endif /* CONFIG_CIFS_POSIX */
 751
 752 #ifdef CONFIG_CIFS_EXPERIMENTAL
 753         .dir_notify = cifs_dir_notify,
 754         .setlease = cifs_setlease,
 755 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 756 };
 757
 758 const struct file_operations cifs_file_direct_ops = {
 759         /* no mmap, no aio, no readv -
 760            BB reevaluate whether they can be done with directio, no cache */
 761         .read = cifs_user_read,
 762         .write = cifs_user_write,
 763         .open = cifs_open,
 764         .release = cifs_close,
 765         .lock = cifs_lock,
 766         .fsync = cifs_fsync,
 767         .flush = cifs_flush,
 768         .splice_read = generic_file_splice_read,
 769 #ifdef CONFIG_CIFS_POSIX
 770         .unlocked_ioctl  = cifs_ioctl,
 771 #endif /* CONFIG_CIFS_POSIX */
 772         .llseek = cifs_llseek,
 773 #ifdef CONFIG_CIFS_EXPERIMENTAL
 774         .dir_notify = cifs_dir_notify,
 775         .setlease = cifs_setlease,
 776 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 777 };
 778 const struct file_operations cifs_file_nobrl_ops = {
 779         .read = do_sync_read,
 780         .write = do_sync_write,
 781         .aio_read = generic_file_aio_read,
 782         .aio_write = cifs_file_aio_write,
 783         .open = cifs_open,
 784         .release = cifs_close,
 785         .fsync = cifs_fsync,
 786         .flush = cifs_flush,
 787         .mmap  = cifs_file_mmap,
 788         .splice_read = generic_file_splice_read,
 789         .llseek = cifs_llseek,
 790 #ifdef CONFIG_CIFS_POSIX
 791         .unlocked_ioctl = cifs_ioctl,
 792 #endif /* CONFIG_CIFS_POSIX */
 793
 794 #ifdef CONFIG_CIFS_EXPERIMENTAL
 795         .dir_notify = cifs_dir_notify,
 796         .setlease = cifs_setlease,
 797 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 798 };
 799
 800 const struct file_operations cifs_file_direct_nobrl_ops = {
 801         /* no mmap, no aio, no readv -
 802            BB reevaluate whether they can be done with directio, no cache */
 803         .read = cifs_user_read,
 804         .write = cifs_user_write,
 805         .open = cifs_open,
 806         .release = cifs_close,
 807         .fsync = cifs_fsync,
 808         .flush = cifs_flush,
 809         .splice_read = generic_file_splice_read,
 810 #ifdef CONFIG_CIFS_POSIX
 811         .unlocked_ioctl  = cifs_ioctl,
 812 #endif /* CONFIG_CIFS_POSIX */
 813         .llseek = cifs_llseek,
 814 #ifdef CONFIG_CIFS_EXPERIMENTAL
 815         .dir_notify = cifs_dir_notify,
 816         .setlease = cifs_setlease,
 817 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 818 };
 819
 820 const struct file_operations cifs_dir_ops = {
 821         .readdir = cifs_readdir,
 822         .release = cifs_closedir,
 823         .read    = generic_read_dir,
 824 #ifdef CONFIG_CIFS_EXPERIMENTAL
 825         .dir_notify = cifs_dir_notify,
 826 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 827         .unlocked_ioctl  = cifs_ioctl,
 828         .llseek = generic_file_llseek,
 829 };
 830
 831 static void
 832 cifs_init_once(void *inode)
 833 {
 834         struct cifsInodeInfo *cifsi = inode;
 835
 836         inode_init_once(&cifsi->vfs_inode);
 837         INIT_LIST_HEAD(&cifsi->lockList);
 838 }
 839
 840 static int
 841 cifs_init_inodecache(void)
 842 {
 843         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 844                                               sizeof(struct cifsInodeInfo),
 845                                               0, (SLAB_RECLAIM_ACCOUNT|
 846                                                 SLAB_MEM_SPREAD),
 847                                               cifs_init_once);
 848         if (cifs_inode_cachep == NULL)
 849                 return -ENOMEM;
 850
 851         return 0;
 852 }
 853
 854 static void
 855 cifs_destroy_inodecache(void)
 856 {
 857         kmem_cache_destroy(cifs_inode_cachep);
 858 }
 859
 860 static int
 861 cifs_init_request_bufs(void)
 862 {
 863         if (CIFSMaxBufSize < 8192) {
 864         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 865         Unicode path name has to fit in any SMB/CIFS path based frames */
 866                 CIFSMaxBufSize = 8192;
 867         } else if (CIFSMaxBufSize > 1024*127) {
 868                 CIFSMaxBufSize = 1024 * 127;
 869         } else {
 870                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 871         }
 872 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 873         cifs_req_cachep = kmem_cache_create("cifs_request",
 874                                             CIFSMaxBufSize +
 875                                             MAX_CIFS_HDR_SIZE, 0,
 876                                             SLAB_HWCACHE_ALIGN, NULL);
 877         if (cifs_req_cachep == NULL)
 878                 return -ENOMEM;
 879
 880         if (cifs_min_rcv < 1)
 881                 cifs_min_rcv = 1;
 882         else if (cifs_min_rcv > 64) {
 883                 cifs_min_rcv = 64;
 884                 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
 885         }
 886
 887         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 888                                                   cifs_req_cachep);
 889
 890         if (cifs_req_poolp == NULL) {
 891                 kmem_cache_destroy(cifs_req_cachep);
 892                 return -ENOMEM;
 893         }
 894         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 895         almost all handle based requests (but not write response, nor is it
 896         sufficient for path based requests).  A smaller size would have
 897         been more efficient (compacting multiple slab items on one 4k page)
 898         for the case in which debug was on, but this larger size allows
 899         more SMBs to use small buffer alloc and is still much more
 900         efficient to alloc 1 per page off the slab compared to 17K (5page)
 901         alloc of large cifs buffers even when page debugging is on */
 902         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 903                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 904                         NULL);
 905         if (cifs_sm_req_cachep == NULL) {
 906                 mempool_destroy(cifs_req_poolp);
 907                 kmem_cache_destroy(cifs_req_cachep);
 908                 return -ENOMEM;
 909         }
 910
 911         if (cifs_min_small < 2)
 912                 cifs_min_small = 2;
 913         else if (cifs_min_small > 256) {
 914                 cifs_min_small = 256;
 915                 cFYI(1, ("cifs_min_small set to maximum (256)"));
 916         }
 917
 918         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 919                                                      cifs_sm_req_cachep);
 920
 921         if (cifs_sm_req_poolp == NULL) {
 922                 mempool_destroy(cifs_req_poolp);
 923                 kmem_cache_destroy(cifs_req_cachep);
 924                 kmem_cache_destroy(cifs_sm_req_cachep);
 925                 return -ENOMEM;
 926         }
 927
 928         return 0;
 929 }
 930
 931 static void
 932 cifs_destroy_request_bufs(void)
 933 {
 934         mempool_destroy(cifs_req_poolp);
 935         kmem_cache_destroy(cifs_req_cachep);
 936         mempool_destroy(cifs_sm_req_poolp);
 937         kmem_cache_destroy(cifs_sm_req_cachep);
 938 }
 939
 940 static int
 941 cifs_init_mids(void)
 942 {
 943         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 944                                             sizeof(struct mid_q_entry), 0,
 945                                             SLAB_HWCACHE_ALIGN, NULL);
 946         if (cifs_mid_cachep == NULL)
 947                 return -ENOMEM;
 948
 949         /* 3 is a reasonable minimum number of simultaneous operations */
 950         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 951         if (cifs_mid_poolp == NULL) {
 952                 kmem_cache_destroy(cifs_mid_cachep);
 953                 return -ENOMEM;
 954         }
 955
 956         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 957                                         sizeof(struct oplock_q_entry), 0,
 958                                         SLAB_HWCACHE_ALIGN, NULL);
 959         if (cifs_oplock_cachep == NULL) {
 960                 mempool_destroy(cifs_mid_poolp);
 961                 kmem_cache_destroy(cifs_mid_cachep);
 962                 return -ENOMEM;
 963         }
 964
 965         return 0;
 966 }
 967
 968 static void
 969 cifs_destroy_mids(void)
 970 {
 971         mempool_destroy(cifs_mid_poolp);
 972         kmem_cache_destroy(cifs_mid_cachep);
 973         kmem_cache_destroy(cifs_oplock_cachep);
 974 }
 975
 976 static int cifs_oplock_thread(void *dummyarg)
 977 {
 978         struct oplock_q_entry *oplock_item;
 979         struct cifsTconInfo *pTcon;
 980         struct inode *inode;
 981         __u16  netfid;
 982         int rc, waitrc = 0;
 983
 984         set_freezable();
 985         do {
 986                 if (try_to_freeze())
 987                         continue;
 988
 989                 spin_lock(&GlobalMid_Lock);
 990                 if (list_empty(&GlobalOplock_Q)) {
 991                         spin_unlock(&GlobalMid_Lock);
 992                         set_current_state(TASK_INTERRUPTIBLE);
 993                         schedule_timeout(39*HZ);
 994                 } else {
 995                         oplock_item = list_entry(GlobalOplock_Q.next,
 996                                                 struct oplock_q_entry, qhead);
 997                         cFYI(1, ("found oplock item to write out"));
 998                         pTcon = oplock_item->tcon;
 999                         inode = oplock_item->pinode;
1000                         netfid = oplock_item->netfid;
1001                         spin_unlock(&GlobalMid_Lock);
1002                         DeleteOplockQEntry(oplock_item);
1003                         /* can not grab inode sem here since it would
1004                                 deadlock when oplock received on delete
1005                                 since vfs_unlink holds the i_mutex across
1006                                 the call */
1007                         /* mutex_lock(&inode->i_mutex);*/
1008                         if (S_ISREG(inode->i_mode)) {
1009 #ifdef CONFIG_CIFS_EXPERIMENTAL
1010                                 if (CIFS_I(inode)->clientCanCacheAll == 0)
1011                                         break_lease(inode, FMODE_READ);
1012                                 else if (CIFS_I(inode)->clientCanCacheRead == 0)
1013                                         break_lease(inode, FMODE_WRITE);
1014 #endif
1015                                 rc = filemap_fdatawrite(inode->i_mapping);
1016                                 if (CIFS_I(inode)->clientCanCacheRead == 0) {
1017                                         waitrc = filemap_fdatawait(
1018                                                               inode->i_mapping);
1019                                         invalidate_remote_inode(inode);
1020                                 }
1021                                 if (rc == 0)
1022                                         rc = waitrc;
1023                         } else
1024                                 rc = 0;
1025                         /* mutex_unlock(&inode->i_mutex);*/
1026                         if (rc)
1027                                 CIFS_I(inode)->write_behind_rc = rc;
1028                         cFYI(1, ("Oplock flush inode %p rc %d",
1029                                 inode, rc));
1030
1031                                 /* releasing stale oplock after recent reconnect
1032                                 of smb session using a now incorrect file
1033                                 handle is not a data integrity issue but do
1034                                 not bother sending an oplock release if session
1035                                 to server still is disconnected since oplock
1036                                 already released by the server in that case */
1037                         if (!pTcon->need_reconnect) {
1038                                 rc = CIFSSMBLock(0, pTcon, netfid,
1039                                                 0 /* len */ , 0 /* offset */, 0,
1040                                                 0, LOCKING_ANDX_OPLOCK_RELEASE,
1041                                                 false /* wait flag */);
1042                                 cFYI(1, ("Oplock release rc = %d", rc));
1043                         }
1044                         set_current_state(TASK_INTERRUPTIBLE);
1045                         schedule_timeout(1);  /* yield in case q were corrupt */
1046                 }
1047         } while (!kthread_should_stop());
1048
1049         return 0;
1050 }
1051
1052 static int cifs_dnotify_thread(void *dummyarg)
1053 {
1054         struct list_head *tmp;
1055         struct TCP_Server_Info *server;
1056
1057         do {
1058                 if (try_to_freeze())
1059                         continue;
1060                 set_current_state(TASK_INTERRUPTIBLE);
1061                 schedule_timeout(15*HZ);
1062                 /* check if any stuck requests that need
1063                    to be woken up and wakeq so the
1064                    thread can wake up and error out */
1065                 read_lock(&cifs_tcp_ses_lock);
1066                 list_for_each(tmp, &cifs_tcp_ses_list) {
1067                         server = list_entry(tmp, struct TCP_Server_Info,
1068                                          tcp_ses_list);
1069                         if (atomic_read(&server->inFlight))
1070                                 wake_up_all(&server->response_q);
1071                 }
1072                 read_unlock(&cifs_tcp_ses_lock);
1073         } while (!kthread_should_stop());
1074
1075         return 0;
1076 }
1077
1078 static int __init
1079 init_cifs(void)
1080 {
1081         int rc = 0;
1082         cifs_proc_init();
1083         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1084         INIT_LIST_HEAD(&GlobalOplock_Q);
1085 #ifdef CONFIG_CIFS_EXPERIMENTAL
1086         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1087         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1088 #endif
1089 /*
1090  *  Initialize Global counters
1091  */
1092         atomic_set(&sesInfoAllocCount, 0);
1093         atomic_set(&tconInfoAllocCount, 0);
1094         atomic_set(&tcpSesAllocCount, 0);
1095         atomic_set(&tcpSesReconnectCount, 0);
1096         atomic_set(&tconInfoReconnectCount, 0);
1097
1098         atomic_set(&bufAllocCount, 0);
1099         atomic_set(&smBufAllocCount, 0);
1100 #ifdef CONFIG_CIFS_STATS2
1101         atomic_set(&totBufAllocCount, 0);
1102         atomic_set(&totSmBufAllocCount, 0);
1103 #endif /* CONFIG_CIFS_STATS2 */
1104
1105         atomic_set(&midCount, 0);
1106         GlobalCurrentXid = 0;
1107         GlobalTotalActiveXid = 0;
1108         GlobalMaxActiveXid = 0;
1109         memset(Local_System_Name, 0, 15);
1110         rwlock_init(&GlobalSMBSeslock);
1111         rwlock_init(&cifs_tcp_ses_lock);
1112         spin_lock_init(&GlobalMid_Lock);
1113
1114         if (cifs_max_pending < 2) {
1115                 cifs_max_pending = 2;
1116                 cFYI(1, ("cifs_max_pending set to min of 2"));
1117         } else if (cifs_max_pending > 256) {
1118                 cifs_max_pending = 256;
1119                 cFYI(1, ("cifs_max_pending set to max of 256"));
1120         }
1121
1122         rc = cifs_init_inodecache();
1123         if (rc)
1124                 goto out_clean_proc;
1125
1126         rc = cifs_init_mids();
1127         if (rc)
1128                 goto out_destroy_inodecache;
1129
1130         rc = cifs_init_request_bufs();
1131         if (rc)
1132                 goto out_destroy_mids;
1133
1134         rc = register_filesystem(&cifs_fs_type);
1135         if (rc)
1136                 goto out_destroy_request_bufs;
1137 #ifdef CONFIG_CIFS_UPCALL
1138         rc = register_key_type(&cifs_spnego_key_type);
1139         if (rc)
1140                 goto out_unregister_filesystem;
1141 #endif
1142 #ifdef CONFIG_CIFS_DFS_UPCALL
1143         rc = register_key_type(&key_type_dns_resolver);
1144         if (rc)
1145                 goto out_unregister_key_type;
1146 #endif
1147         oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1148         if (IS_ERR(oplockThread)) {
1149                 rc = PTR_ERR(oplockThread);
1150                 cERROR(1, ("error %d create oplock thread", rc));
1151                 goto out_unregister_dfs_key_type;
1152         }
1153
1154         dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1155         if (IS_ERR(dnotifyThread)) {
1156                 rc = PTR_ERR(dnotifyThread);
1157                 cERROR(1, ("error %d create dnotify thread", rc));
1158                 goto out_stop_oplock_thread;
1159         }
1160
1161         return 0;
1162
1163  out_stop_oplock_thread:
1164         kthread_stop(oplockThread);
1165  out_unregister_dfs_key_type:
1166 #ifdef CONFIG_CIFS_DFS_UPCALL
1167         unregister_key_type(&key_type_dns_resolver);
1168  out_unregister_key_type:
1169 #endif
1170 #ifdef CONFIG_CIFS_UPCALL
1171         unregister_key_type(&cifs_spnego_key_type);
1172  out_unregister_filesystem:
1173 #endif
1174         unregister_filesystem(&cifs_fs_type);
1175  out_destroy_request_bufs:
1176         cifs_destroy_request_bufs();
1177  out_destroy_mids:
1178         cifs_destroy_mids();
1179  out_destroy_inodecache:
1180         cifs_destroy_inodecache();
1181  out_clean_proc:
1182         cifs_proc_clean();
1183         return rc;
1184 }
1185
1186 static void __exit
1187 exit_cifs(void)
1188 {
1189         cFYI(DBG2, ("exit_cifs"));
1190         cifs_proc_clean();
1191 #ifdef CONFIG_CIFS_DFS_UPCALL
1192         cifs_dfs_release_automount_timer();
1193         unregister_key_type(&key_type_dns_resolver);
1194 #endif
1195 #ifdef CONFIG_CIFS_UPCALL
1196         unregister_key_type(&cifs_spnego_key_type);
1197 #endif
1198         unregister_filesystem(&cifs_fs_type);
1199         cifs_destroy_inodecache();
1200         cifs_destroy_mids();
1201         cifs_destroy_request_bufs();
1202         kthread_stop(oplockThread);
1203         kthread_stop(dnotifyThread);
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)