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 <linux/namei.h>
  39 #include <net/ipv6.h>
  40 #include "cifsfs.h"
  41 #include "cifspdu.h"
  42 #define DECLARE_GLOBALS_HERE
  43 #include "cifsglob.h"
  44 #include "cifsproto.h"
  45 #include "cifs_debug.h"
  46 #include "cifs_fs_sb.h"
  47 #include <linux/mm.h>
  48 #include <linux/key-type.h>
  49 #include "cifs_spnego.h"
  50 #include "fscache.h"
  51 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  52
  53 int cifsFYI = 0;
  54 int cifsERROR = 1;
  55 int traceSMB = 0;
  56 bool enable_oplocks = true;
  57 unsigned int linuxExtEnabled = 1;
  58 unsigned int lookupCacheEnabled = 1;
  59 unsigned int multiuser_mount = 0;
  60 unsigned int global_secflags = CIFSSEC_DEF;
  61 /* unsigned int ntlmv2_support = 0; */
  62 unsigned int sign_CIFS_PDUs = 1;
  63 static const struct super_operations cifs_super_ops;
  64 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  65 module_param(CIFSMaxBufSize, int, 0);
  66 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  67                                  "Default: 16384 Range: 8192 to 130048");
  68 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  69 module_param(cifs_min_rcv, int, 0);
  70 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  71                                 "1 to 64");
  72 unsigned int cifs_min_small = 30;
  73 module_param(cifs_min_small, int, 0);
  74 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  75                                  "Range: 2 to 256");
  76 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  77 module_param(cifs_max_pending, int, 0444);
  78 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  79                                    "Default: 50 Range: 2 to 256");
  80 unsigned short echo_retries = 5;
  81 module_param(echo_retries, ushort, 0644);
  82 MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and "
  83                                "reconnecting server. Default: 5. 0 means "
  84                                "never reconnect.");
  85 module_param(enable_oplocks, bool, 0644);
  86 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks (bool). Default:"
  87                                  "y/Y/1");
  88
  89 extern mempool_t *cifs_sm_req_poolp;
  90 extern mempool_t *cifs_req_poolp;
  91 extern mempool_t *cifs_mid_poolp;
  92
  93 static int
  94 cifs_read_super(struct super_block *sb)
  95 {
  96         struct inode *inode;
  97         struct cifs_sb_info *cifs_sb;
  98         int rc = 0;
  99
 100         cifs_sb = CIFS_SB(sb);
 101
 102         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
 103                 sb->s_flags |= MS_POSIXACL;
 104
 105         if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES)
 106                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 107         else
 108                 sb->s_maxbytes = MAX_NON_LFS;
 109
 110         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
 111         sb->s_time_gran = 100;
 112
 113         sb->s_magic = CIFS_MAGIC_NUMBER;
 114         sb->s_op = &cifs_super_ops;
 115         sb->s_bdi = &cifs_sb->bdi;
 116         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 117         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 118         inode = cifs_root_iget(sb);
 119
 120         if (IS_ERR(inode)) {
 121                 rc = PTR_ERR(inode);
 122                 inode = NULL;
 123                 goto out_no_root;
 124         }
 125
 126         sb->s_root = d_alloc_root(inode);
 127
 128         if (!sb->s_root) {
 129                 rc = -ENOMEM;
 130                 goto out_no_root;
 131         }
 132
 133         /* do that *after* d_alloc_root() - we want NULL ->d_op for root here */
 134         if (cifs_sb_master_tcon(cifs_sb)->nocase)
 135                 sb->s_d_op = &cifs_ci_dentry_ops;
 136         else
 137                 sb->s_d_op = &cifs_dentry_ops;
 138
 139 #ifdef CONFIG_CIFS_NFSD_EXPORT
 140         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 141                 cFYI(1, "export ops supported");
 142                 sb->s_export_op = &cifs_export_ops;
 143         }
 144 #endif /* CONFIG_CIFS_NFSD_EXPORT */
 145
 146         return 0;
 147
 148 out_no_root:
 149         cERROR(1, "cifs_read_super: get root inode failed");
 150         if (inode)
 151                 iput(inode);
 152
 153         return rc;
 154 }
 155
 156 static void cifs_kill_sb(struct super_block *sb)
 157 {
 158         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 159         kill_anon_super(sb);
 160         cifs_umount(cifs_sb);
 161 }
 162
 163 static int
 164 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 165 {
 166         struct super_block *sb = dentry->d_sb;
 167         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 168         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 169         int rc = -EOPNOTSUPP;
 170         int xid;
 171
 172         xid = GetXid();
 173
 174         buf->f_type = CIFS_MAGIC_NUMBER;
 175
 176         /*
 177          * PATH_MAX may be too long - it would presumably be total path,
 178          * but note that some servers (includinng Samba 3) have a shorter
 179          * maximum path.
 180          *
 181          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 182          */
 183         buf->f_namelen = PATH_MAX;
 184         buf->f_files = 0;       /* undefined */
 185         buf->f_ffree = 0;       /* unlimited */
 186
 187         /*
 188          * We could add a second check for a QFS Unix capability bit
 189          */
 190         if ((tcon->ses->capabilities & CAP_UNIX) &&
 191             (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
 192                 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
 193
 194         /*
 195          * Only need to call the old QFSInfo if failed on newer one,
 196          * e.g. by OS/2.
 197          **/
 198         if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
 199                 rc = CIFSSMBQFSInfo(xid, tcon, buf);
 200
 201         /*
 202          * Some old Windows servers also do not support level 103, retry with
 203          * older level one if old server failed the previous call or we
 204          * bypassed it because we detected that this was an older LANMAN sess
 205          */
 206         if (rc)
 207                 rc = SMBOldQFSInfo(xid, tcon, buf);
 208
 209         FreeXid(xid);
 210         return 0;
 211 }
 212
 213 static int cifs_permission(struct inode *inode, int mask)
 214 {
 215         struct cifs_sb_info *cifs_sb;
 216
 217         cifs_sb = CIFS_SB(inode->i_sb);
 218
 219         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 220                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 221                         return -EACCES;
 222                 else
 223                         return 0;
 224         } else /* file mode might have been restricted at mount time
 225                 on the client (above and beyond ACL on servers) for
 226                 servers which do not support setting and viewing mode bits,
 227                 so allowing client to check permissions is useful */
 228                 return generic_permission(inode, mask);
 229 }
 230
 231 static struct kmem_cache *cifs_inode_cachep;
 232 static struct kmem_cache *cifs_req_cachep;
 233 static struct kmem_cache *cifs_mid_cachep;
 234 static struct kmem_cache *cifs_sm_req_cachep;
 235 mempool_t *cifs_sm_req_poolp;
 236 mempool_t *cifs_req_poolp;
 237 mempool_t *cifs_mid_poolp;
 238
 239 static struct inode *
 240 cifs_alloc_inode(struct super_block *sb)
 241 {
 242         struct cifsInodeInfo *cifs_inode;
 243         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 244         if (!cifs_inode)
 245                 return NULL;
 246         cifs_inode->cifsAttrs = 0x20;   /* default */
 247         cifs_inode->time = 0;
 248         /* Until the file is open and we have gotten oplock
 249         info back from the server, can not assume caching of
 250         file data or metadata */
 251         cifs_set_oplock_level(cifs_inode, 0);
 252         cifs_inode->delete_pending = false;
 253         cifs_inode->invalid_mapping = false;
 254         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 255         cifs_inode->server_eof = 0;
 256         cifs_inode->uniqueid = 0;
 257         cifs_inode->createtime = 0;
 258
 259         /* Can not set i_flags here - they get immediately overwritten
 260            to zero by the VFS */
 261 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 262         INIT_LIST_HEAD(&cifs_inode->openFileList);
 263         return &cifs_inode->vfs_inode;
 264 }
 265
 266 static void cifs_i_callback(struct rcu_head *head)
 267 {
 268         struct inode *inode = container_of(head, struct inode, i_rcu);
 269         INIT_LIST_HEAD(&inode->i_dentry);
 270         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 271 }
 272
 273 static void
 274 cifs_destroy_inode(struct inode *inode)
 275 {
 276         call_rcu(&inode->i_rcu, cifs_i_callback);
 277 }
 278
 279 static void
 280 cifs_evict_inode(struct inode *inode)
 281 {
 282         truncate_inode_pages(&inode->i_data, 0);
 283         end_writeback(inode);
 284         cifs_fscache_release_inode_cookie(inode);
 285 }
 286
 287 static void
 288 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 289 {
 290         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 291         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 292
 293         seq_printf(s, ",addr=");
 294
 295         switch (server->dstaddr.ss_family) {
 296         case AF_INET:
 297                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 298                 break;
 299         case AF_INET6:
 300                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 301                 if (sa6->sin6_scope_id)
 302                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 303                 break;
 304         default:
 305                 seq_printf(s, "(unknown)");
 306         }
 307 }
 308
 309 static void
 310 cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server)
 311 {
 312         seq_printf(s, ",sec=");
 313
 314         switch (server->secType) {
 315         case LANMAN:
 316                 seq_printf(s, "lanman");
 317                 break;
 318         case NTLMv2:
 319                 seq_printf(s, "ntlmv2");
 320                 break;
 321         case NTLM:
 322                 seq_printf(s, "ntlm");
 323                 break;
 324         case Kerberos:
 325                 seq_printf(s, "krb5");
 326                 break;
 327         case RawNTLMSSP:
 328                 seq_printf(s, "ntlmssp");
 329                 break;
 330         default:
 331                 /* shouldn't ever happen */
 332                 seq_printf(s, "unknown");
 333                 break;
 334         }
 335
 336         if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
 337                 seq_printf(s, "i");
 338 }
 339
 340 /*
 341  * cifs_show_options() is for displaying mount options in /proc/mounts.
 342  * Not all settable options are displayed but most of the important
 343  * ones are.
 344  */
 345 static int
 346 cifs_show_options(struct seq_file *s, struct dentry *root)
 347 {
 348         struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
 349         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 350         struct sockaddr *srcaddr;
 351         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 352
 353         cifs_show_security(s, tcon->ses->server);
 354
 355         seq_printf(s, ",unc=%s", tcon->treeName);
 356
 357         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 358                 seq_printf(s, ",multiuser");
 359         else if (tcon->ses->user_name)
 360                 seq_printf(s, ",username=%s", tcon->ses->user_name);
 361
 362         if (tcon->ses->domainName)
 363                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 364
 365         if (srcaddr->sa_family != AF_UNSPEC) {
 366                 struct sockaddr_in *saddr4;
 367                 struct sockaddr_in6 *saddr6;
 368                 saddr4 = (struct sockaddr_in *)srcaddr;
 369                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 370                 if (srcaddr->sa_family == AF_INET6)
 371                         seq_printf(s, ",srcaddr=%pI6c",
 372                                    &saddr6->sin6_addr);
 373                 else if (srcaddr->sa_family == AF_INET)
 374                         seq_printf(s, ",srcaddr=%pI4",
 375                                    &saddr4->sin_addr.s_addr);
 376                 else
 377                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 378                                    (int)(srcaddr->sa_family));
 379         }
 380
 381         seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 382         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 383                 seq_printf(s, ",forceuid");
 384         else
 385                 seq_printf(s, ",noforceuid");
 386
 387         seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 388         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 389                 seq_printf(s, ",forcegid");
 390         else
 391                 seq_printf(s, ",noforcegid");
 392
 393         cifs_show_address(s, tcon->ses->server);
 394
 395         if (!tcon->unix_ext)
 396                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 397                                            cifs_sb->mnt_file_mode,
 398                                            cifs_sb->mnt_dir_mode);
 399         if (tcon->seal)
 400                 seq_printf(s, ",seal");
 401         if (tcon->nocase)
 402                 seq_printf(s, ",nocase");
 403         if (tcon->retry)
 404                 seq_printf(s, ",hard");
 405         if (tcon->unix_ext)
 406                 seq_printf(s, ",unix");
 407         else
 408                 seq_printf(s, ",nounix");
 409         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 410                 seq_printf(s, ",posixpaths");
 411         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 412                 seq_printf(s, ",setuids");
 413         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 414                 seq_printf(s, ",serverino");
 415         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 416                 seq_printf(s, ",rwpidforward");
 417         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 418                 seq_printf(s, ",forcemand");
 419         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 420                 seq_printf(s, ",directio");
 421         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 422                 seq_printf(s, ",nouser_xattr");
 423         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 424                 seq_printf(s, ",mapchars");
 425         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 426                 seq_printf(s, ",sfu");
 427         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 428                 seq_printf(s, ",nobrl");
 429         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 430                 seq_printf(s, ",cifsacl");
 431         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 432                 seq_printf(s, ",dynperm");
 433         if (root->d_sb->s_flags & MS_POSIXACL)
 434                 seq_printf(s, ",acl");
 435         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 436                 seq_printf(s, ",mfsymlinks");
 437         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 438                 seq_printf(s, ",fsc");
 439         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 440                 seq_printf(s, ",nostrictsync");
 441         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 442                 seq_printf(s, ",noperm");
 443         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
 444                 seq_printf(s, ",strictcache");
 445
 446         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 447         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 448         /* convert actimeo and display it in seconds */
 449                 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 450
 451         return 0;
 452 }
 453
 454 static void cifs_umount_begin(struct super_block *sb)
 455 {
 456         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 457         struct cifs_tcon *tcon;
 458
 459         if (cifs_sb == NULL)
 460                 return;
 461
 462         tcon = cifs_sb_master_tcon(cifs_sb);
 463
 464         spin_lock(&cifs_tcp_ses_lock);
 465         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 466                 /* we have other mounts to same share or we have
 467                    already tried to force umount this and woken up
 468                    all waiting network requests, nothing to do */
 469                 spin_unlock(&cifs_tcp_ses_lock);
 470                 return;
 471         } else if (tcon->tc_count == 1)
 472                 tcon->tidStatus = CifsExiting;
 473         spin_unlock(&cifs_tcp_ses_lock);
 474
 475         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 476         /* cancel_notify_requests(tcon); */
 477         if (tcon->ses && tcon->ses->server) {
 478                 cFYI(1, "wake up tasks now - umount begin not complete");
 479                 wake_up_all(&tcon->ses->server->request_q);
 480                 wake_up_all(&tcon->ses->server->response_q);
 481                 msleep(1); /* yield */
 482                 /* we have to kick the requests once more */
 483                 wake_up_all(&tcon->ses->server->response_q);
 484                 msleep(1);
 485         }
 486
 487         return;
 488 }
 489
 490 #ifdef CONFIG_CIFS_STATS2
 491 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 492 {
 493         /* BB FIXME */
 494         return 0;
 495 }
 496 #endif
 497
 498 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 499 {
 500         *flags |= MS_NODIRATIME;
 501         return 0;
 502 }
 503
 504 static int cifs_drop_inode(struct inode *inode)
 505 {
 506         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 507
 508         /* no serverino => unconditional eviction */
 509         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 510                 generic_drop_inode(inode);
 511 }
 512
 513 static const struct super_operations cifs_super_ops = {
 514         .statfs = cifs_statfs,
 515         .alloc_inode = cifs_alloc_inode,
 516         .destroy_inode = cifs_destroy_inode,
 517         .drop_inode     = cifs_drop_inode,
 518         .evict_inode    = cifs_evict_inode,
 519 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 520         function unless later we add lazy close of inodes or unless the
 521         kernel forgets to call us with the same number of releases (closes)
 522         as opens */
 523         .show_options = cifs_show_options,
 524         .umount_begin   = cifs_umount_begin,
 525         .remount_fs = cifs_remount,
 526 #ifdef CONFIG_CIFS_STATS2
 527         .show_stats = cifs_show_stats,
 528 #endif
 529 };
 530
 531 /*
 532  * Get root dentry from superblock according to prefix path mount option.
 533  * Return dentry with refcount + 1 on success and NULL otherwise.
 534  */
 535 static struct dentry *
 536 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 537 {
 538         struct dentry *dentry;
 539         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 540         char *full_path = NULL;
 541         char *s, *p;
 542         char sep;
 543
 544         full_path = cifs_build_path_to_root(vol, cifs_sb,
 545                                             cifs_sb_master_tcon(cifs_sb));
 546         if (full_path == NULL)
 547                 return ERR_PTR(-ENOMEM);
 548
 549         cFYI(1, "Get root dentry for %s", full_path);
 550
 551         sep = CIFS_DIR_SEP(cifs_sb);
 552         dentry = dget(sb->s_root);
 553         p = s = full_path;
 554
 555         do {
 556                 struct inode *dir = dentry->d_inode;
 557                 struct dentry *child;
 558
 559                 if (!dir) {
 560                         dput(dentry);
 561                         dentry = ERR_PTR(-ENOENT);
 562                         break;
 563                 }
 564
 565                 /* skip separators */
 566                 while (*s == sep)
 567                         s++;
 568                 if (!*s)
 569                         break;
 570                 p = s++;
 571                 /* next separator */
 572                 while (*s && *s != sep)
 573                         s++;
 574
 575                 mutex_lock(&dir->i_mutex);
 576                 child = lookup_one_len(p, dentry, s - p);
 577                 mutex_unlock(&dir->i_mutex);
 578                 dput(dentry);
 579                 dentry = child;
 580         } while (!IS_ERR(dentry));
 581         kfree(full_path);
 582         return dentry;
 583 }
 584
 585 static int cifs_set_super(struct super_block *sb, void *data)
 586 {
 587         struct cifs_mnt_data *mnt_data = data;
 588         sb->s_fs_info = mnt_data->cifs_sb;
 589         return set_anon_super(sb, NULL);
 590 }
 591
 592 static struct dentry *
 593 cifs_do_mount(struct file_system_type *fs_type,
 594               int flags, const char *dev_name, void *data)
 595 {
 596         int rc;
 597         struct super_block *sb;
 598         struct cifs_sb_info *cifs_sb;
 599         struct smb_vol *volume_info;
 600         struct cifs_mnt_data mnt_data;
 601         struct dentry *root;
 602
 603         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 604
 605         volume_info = cifs_get_volume_info((char *)data, dev_name);
 606         if (IS_ERR(volume_info))
 607                 return ERR_CAST(volume_info);
 608
 609         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 610         if (cifs_sb == NULL) {
 611                 root = ERR_PTR(-ENOMEM);
 612                 goto out_nls;
 613         }
 614
 615         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 616         if (cifs_sb->mountdata == NULL) {
 617                 root = ERR_PTR(-ENOMEM);
 618                 goto out_cifs_sb;
 619         }
 620
 621         cifs_setup_cifs_sb(volume_info, cifs_sb);
 622
 623         rc = cifs_mount(cifs_sb, volume_info);
 624         if (rc) {
 625                 if (!(flags & MS_SILENT))
 626                         cERROR(1, "cifs_mount failed w/return code = %d", rc);
 627                 root = ERR_PTR(rc);
 628                 goto out_mountdata;
 629         }
 630
 631         mnt_data.vol = volume_info;
 632         mnt_data.cifs_sb = cifs_sb;
 633         mnt_data.flags = flags;
 634
 635         sb = sget(fs_type, cifs_match_super, cifs_set_super, &mnt_data);
 636         if (IS_ERR(sb)) {
 637                 root = ERR_CAST(sb);
 638                 cifs_umount(cifs_sb);
 639                 goto out;
 640         }
 641
 642         if (sb->s_root) {
 643                 cFYI(1, "Use existing superblock");
 644                 cifs_umount(cifs_sb);
 645         } else {
 646                 sb->s_flags = flags;
 647                 /* BB should we make this contingent on mount parm? */
 648                 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 649
 650                 rc = cifs_read_super(sb);
 651                 if (rc) {
 652                         root = ERR_PTR(rc);
 653                         goto out_super;
 654                 }
 655
 656                 sb->s_flags |= MS_ACTIVE;
 657         }
 658
 659         root = cifs_get_root(volume_info, sb);
 660         if (IS_ERR(root))
 661                 goto out_super;
 662
 663         cFYI(1, "dentry root is: %p", root);
 664         goto out;
 665
 666 out_super:
 667         deactivate_locked_super(sb);
 668 out:
 669         cifs_cleanup_volume_info(volume_info);
 670         return root;
 671
 672 out_mountdata:
 673         kfree(cifs_sb->mountdata);
 674 out_cifs_sb:
 675         kfree(cifs_sb);
 676 out_nls:
 677         unload_nls(volume_info->local_nls);
 678         goto out;
 679 }
 680
 681 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 682                                    unsigned long nr_segs, loff_t pos)
 683 {
 684         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 685         ssize_t written;
 686         int rc;
 687
 688         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 689
 690         if (CIFS_I(inode)->clientCanCacheAll)
 691                 return written;
 692
 693         rc = filemap_fdatawrite(inode->i_mapping);
 694         if (rc)
 695                 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
 696
 697         return written;
 698 }
 699
 700 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 701 {
 702         /*
 703          * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 704          * the cached file length
 705          */
 706         if (origin != SEEK_SET || origin != SEEK_CUR) {
 707                 int rc;
 708                 struct inode *inode = file->f_path.dentry->d_inode;
 709
 710                 /*
 711                  * We need to be sure that all dirty pages are written and the
 712                  * server has the newest file length.
 713                  */
 714                 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
 715                     inode->i_mapping->nrpages != 0) {
 716                         rc = filemap_fdatawait(inode->i_mapping);
 717                         if (rc) {
 718                                 mapping_set_error(inode->i_mapping, rc);
 719                                 return rc;
 720                         }
 721                 }
 722                 /*
 723                  * Some applications poll for the file length in this strange
 724                  * way so we must seek to end on non-oplocked files by
 725                  * setting the revalidate time to zero.
 726                  */
 727                 CIFS_I(inode)->time = 0;
 728
 729                 rc = cifs_revalidate_file_attr(file);
 730                 if (rc < 0)
 731                         return (loff_t)rc;
 732         }
 733         return generic_file_llseek(file, offset, origin);
 734 }
 735
 736 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 737 {
 738         /* note that this is called by vfs setlease with lock_flocks held
 739            to protect *lease from going away */
 740         struct inode *inode = file->f_path.dentry->d_inode;
 741         struct cifsFileInfo *cfile = file->private_data;
 742
 743         if (!(S_ISREG(inode->i_mode)))
 744                 return -EINVAL;
 745
 746         /* check if file is oplocked */
 747         if (((arg == F_RDLCK) &&
 748                 (CIFS_I(inode)->clientCanCacheRead)) ||
 749             ((arg == F_WRLCK) &&
 750                 (CIFS_I(inode)->clientCanCacheAll)))
 751                 return generic_setlease(file, arg, lease);
 752         else if (tlink_tcon(cfile->tlink)->local_lease &&
 753                  !CIFS_I(inode)->clientCanCacheRead)
 754                 /* If the server claims to support oplock on this
 755                    file, then we still need to check oplock even
 756                    if the local_lease mount option is set, but there
 757                    are servers which do not support oplock for which
 758                    this mount option may be useful if the user
 759                    knows that the file won't be changed on the server
 760                    by anyone else */
 761                 return generic_setlease(file, arg, lease);
 762         else
 763                 return -EAGAIN;
 764 }
 765
 766 struct file_system_type cifs_fs_type = {
 767         .owner = THIS_MODULE,
 768         .name = "cifs",
 769         .mount = cifs_do_mount,
 770         .kill_sb = cifs_kill_sb,
 771         /*  .fs_flags */
 772 };
 773 const struct inode_operations cifs_dir_inode_ops = {
 774         .create = cifs_create,
 775         .lookup = cifs_lookup,
 776         .getattr = cifs_getattr,
 777         .unlink = cifs_unlink,
 778         .link = cifs_hardlink,
 779         .mkdir = cifs_mkdir,
 780         .rmdir = cifs_rmdir,
 781         .rename = cifs_rename,
 782         .permission = cifs_permission,
 783 /*      revalidate:cifs_revalidate,   */
 784         .setattr = cifs_setattr,
 785         .symlink = cifs_symlink,
 786         .mknod   = cifs_mknod,
 787 #ifdef CONFIG_CIFS_XATTR
 788         .setxattr = cifs_setxattr,
 789         .getxattr = cifs_getxattr,
 790         .listxattr = cifs_listxattr,
 791         .removexattr = cifs_removexattr,
 792 #endif
 793 };
 794
 795 const struct inode_operations cifs_file_inode_ops = {
 796 /*      revalidate:cifs_revalidate, */
 797         .setattr = cifs_setattr,
 798         .getattr = cifs_getattr, /* do we need this anymore? */
 799         .rename = cifs_rename,
 800         .permission = cifs_permission,
 801 #ifdef CONFIG_CIFS_XATTR
 802         .setxattr = cifs_setxattr,
 803         .getxattr = cifs_getxattr,
 804         .listxattr = cifs_listxattr,
 805         .removexattr = cifs_removexattr,
 806 #endif
 807 };
 808
 809 const struct inode_operations cifs_symlink_inode_ops = {
 810         .readlink = generic_readlink,
 811         .follow_link = cifs_follow_link,
 812         .put_link = cifs_put_link,
 813         .permission = cifs_permission,
 814         /* BB add the following two eventually */
 815         /* revalidate: cifs_revalidate,
 816            setattr:    cifs_notify_change, *//* BB do we need notify change */
 817 #ifdef CONFIG_CIFS_XATTR
 818         .setxattr = cifs_setxattr,
 819         .getxattr = cifs_getxattr,
 820         .listxattr = cifs_listxattr,
 821         .removexattr = cifs_removexattr,
 822 #endif
 823 };
 824
 825 const struct file_operations cifs_file_ops = {
 826         .read = do_sync_read,
 827         .write = do_sync_write,
 828         .aio_read = generic_file_aio_read,
 829         .aio_write = cifs_file_aio_write,
 830         .open = cifs_open,
 831         .release = cifs_close,
 832         .lock = cifs_lock,
 833         .fsync = cifs_fsync,
 834         .flush = cifs_flush,
 835         .mmap  = cifs_file_mmap,
 836         .splice_read = generic_file_splice_read,
 837         .llseek = cifs_llseek,
 838 #ifdef CONFIG_CIFS_POSIX
 839         .unlocked_ioctl = cifs_ioctl,
 840 #endif /* CONFIG_CIFS_POSIX */
 841         .setlease = cifs_setlease,
 842 };
 843
 844 const struct file_operations cifs_file_strict_ops = {
 845         .read = do_sync_read,
 846         .write = do_sync_write,
 847         .aio_read = cifs_strict_readv,
 848         .aio_write = cifs_strict_writev,
 849         .open = cifs_open,
 850         .release = cifs_close,
 851         .lock = cifs_lock,
 852         .fsync = cifs_strict_fsync,
 853         .flush = cifs_flush,
 854         .mmap = cifs_file_strict_mmap,
 855         .splice_read = generic_file_splice_read,
 856         .llseek = cifs_llseek,
 857 #ifdef CONFIG_CIFS_POSIX
 858         .unlocked_ioctl = cifs_ioctl,
 859 #endif /* CONFIG_CIFS_POSIX */
 860         .setlease = cifs_setlease,
 861 };
 862
 863 const struct file_operations cifs_file_direct_ops = {
 864         /* BB reevaluate whether they can be done with directio, no cache */
 865         .read = do_sync_read,
 866         .write = do_sync_write,
 867         .aio_read = cifs_user_readv,
 868         .aio_write = cifs_user_writev,
 869         .open = cifs_open,
 870         .release = cifs_close,
 871         .lock = cifs_lock,
 872         .fsync = cifs_fsync,
 873         .flush = cifs_flush,
 874         .mmap = cifs_file_mmap,
 875         .splice_read = generic_file_splice_read,
 876 #ifdef CONFIG_CIFS_POSIX
 877         .unlocked_ioctl  = cifs_ioctl,
 878 #endif /* CONFIG_CIFS_POSIX */
 879         .llseek = cifs_llseek,
 880         .setlease = cifs_setlease,
 881 };
 882
 883 const struct file_operations cifs_file_nobrl_ops = {
 884         .read = do_sync_read,
 885         .write = do_sync_write,
 886         .aio_read = generic_file_aio_read,
 887         .aio_write = cifs_file_aio_write,
 888         .open = cifs_open,
 889         .release = cifs_close,
 890         .fsync = cifs_fsync,
 891         .flush = cifs_flush,
 892         .mmap  = cifs_file_mmap,
 893         .splice_read = generic_file_splice_read,
 894         .llseek = cifs_llseek,
 895 #ifdef CONFIG_CIFS_POSIX
 896         .unlocked_ioctl = cifs_ioctl,
 897 #endif /* CONFIG_CIFS_POSIX */
 898         .setlease = cifs_setlease,
 899 };
 900
 901 const struct file_operations cifs_file_strict_nobrl_ops = {
 902         .read = do_sync_read,
 903         .write = do_sync_write,
 904         .aio_read = cifs_strict_readv,
 905         .aio_write = cifs_strict_writev,
 906         .open = cifs_open,
 907         .release = cifs_close,
 908         .fsync = cifs_strict_fsync,
 909         .flush = cifs_flush,
 910         .mmap = cifs_file_strict_mmap,
 911         .splice_read = generic_file_splice_read,
 912         .llseek = cifs_llseek,
 913 #ifdef CONFIG_CIFS_POSIX
 914         .unlocked_ioctl = cifs_ioctl,
 915 #endif /* CONFIG_CIFS_POSIX */
 916         .setlease = cifs_setlease,
 917 };
 918
 919 const struct file_operations cifs_file_direct_nobrl_ops = {
 920         /* BB reevaluate whether they can be done with directio, no cache */
 921         .read = do_sync_read,
 922         .write = do_sync_write,
 923         .aio_read = cifs_user_readv,
 924         .aio_write = cifs_user_writev,
 925         .open = cifs_open,
 926         .release = cifs_close,
 927         .fsync = cifs_fsync,
 928         .flush = cifs_flush,
 929         .mmap = cifs_file_mmap,
 930         .splice_read = generic_file_splice_read,
 931 #ifdef CONFIG_CIFS_POSIX
 932         .unlocked_ioctl  = cifs_ioctl,
 933 #endif /* CONFIG_CIFS_POSIX */
 934         .llseek = cifs_llseek,
 935         .setlease = cifs_setlease,
 936 };
 937
 938 const struct file_operations cifs_dir_ops = {
 939         .readdir = cifs_readdir,
 940         .release = cifs_closedir,
 941         .read    = generic_read_dir,
 942         .unlocked_ioctl  = cifs_ioctl,
 943         .llseek = generic_file_llseek,
 944 };
 945
 946 static void
 947 cifs_init_once(void *inode)
 948 {
 949         struct cifsInodeInfo *cifsi = inode;
 950
 951         inode_init_once(&cifsi->vfs_inode);
 952         INIT_LIST_HEAD(&cifsi->llist);
 953         mutex_init(&cifsi->lock_mutex);
 954 }
 955
 956 static int
 957 cifs_init_inodecache(void)
 958 {
 959         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 960                                               sizeof(struct cifsInodeInfo),
 961                                               0, (SLAB_RECLAIM_ACCOUNT|
 962                                                 SLAB_MEM_SPREAD),
 963                                               cifs_init_once);
 964         if (cifs_inode_cachep == NULL)
 965                 return -ENOMEM;
 966
 967         return 0;
 968 }
 969
 970 static void
 971 cifs_destroy_inodecache(void)
 972 {
 973         kmem_cache_destroy(cifs_inode_cachep);
 974 }
 975
 976 static int
 977 cifs_init_request_bufs(void)
 978 {
 979         if (CIFSMaxBufSize < 8192) {
 980         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 981         Unicode path name has to fit in any SMB/CIFS path based frames */
 982                 CIFSMaxBufSize = 8192;
 983         } else if (CIFSMaxBufSize > 1024*127) {
 984                 CIFSMaxBufSize = 1024 * 127;
 985         } else {
 986                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 987         }
 988 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 989         cifs_req_cachep = kmem_cache_create("cifs_request",
 990                                             CIFSMaxBufSize +
 991                                             MAX_CIFS_HDR_SIZE, 0,
 992                                             SLAB_HWCACHE_ALIGN, NULL);
 993         if (cifs_req_cachep == NULL)
 994                 return -ENOMEM;
 995
 996         if (cifs_min_rcv < 1)
 997                 cifs_min_rcv = 1;
 998         else if (cifs_min_rcv > 64) {
 999                 cifs_min_rcv = 64;
1000                 cERROR(1, "cifs_min_rcv set to maximum (64)");
1001         }
1002
1003         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1004                                                   cifs_req_cachep);
1005
1006         if (cifs_req_poolp == NULL) {
1007                 kmem_cache_destroy(cifs_req_cachep);
1008                 return -ENOMEM;
1009         }
1010         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1011         almost all handle based requests (but not write response, nor is it
1012         sufficient for path based requests).  A smaller size would have
1013         been more efficient (compacting multiple slab items on one 4k page)
1014         for the case in which debug was on, but this larger size allows
1015         more SMBs to use small buffer alloc and is still much more
1016         efficient to alloc 1 per page off the slab compared to 17K (5page)
1017         alloc of large cifs buffers even when page debugging is on */
1018         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1019                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1020                         NULL);
1021         if (cifs_sm_req_cachep == NULL) {
1022                 mempool_destroy(cifs_req_poolp);
1023                 kmem_cache_destroy(cifs_req_cachep);
1024                 return -ENOMEM;
1025         }
1026
1027         if (cifs_min_small < 2)
1028                 cifs_min_small = 2;
1029         else if (cifs_min_small > 256) {
1030                 cifs_min_small = 256;
1031                 cFYI(1, "cifs_min_small set to maximum (256)");
1032         }
1033
1034         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1035                                                      cifs_sm_req_cachep);
1036
1037         if (cifs_sm_req_poolp == NULL) {
1038                 mempool_destroy(cifs_req_poolp);
1039                 kmem_cache_destroy(cifs_req_cachep);
1040                 kmem_cache_destroy(cifs_sm_req_cachep);
1041                 return -ENOMEM;
1042         }
1043
1044         return 0;
1045 }
1046
1047 static void
1048 cifs_destroy_request_bufs(void)
1049 {
1050         mempool_destroy(cifs_req_poolp);
1051         kmem_cache_destroy(cifs_req_cachep);
1052         mempool_destroy(cifs_sm_req_poolp);
1053         kmem_cache_destroy(cifs_sm_req_cachep);
1054 }
1055
1056 static int
1057 cifs_init_mids(void)
1058 {
1059         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1060                                             sizeof(struct mid_q_entry), 0,
1061                                             SLAB_HWCACHE_ALIGN, NULL);
1062         if (cifs_mid_cachep == NULL)
1063                 return -ENOMEM;
1064
1065         /* 3 is a reasonable minimum number of simultaneous operations */
1066         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1067         if (cifs_mid_poolp == NULL) {
1068                 kmem_cache_destroy(cifs_mid_cachep);
1069                 return -ENOMEM;
1070         }
1071
1072         return 0;
1073 }
1074
1075 static void
1076 cifs_destroy_mids(void)
1077 {
1078         mempool_destroy(cifs_mid_poolp);
1079         kmem_cache_destroy(cifs_mid_cachep);
1080 }
1081
1082 static int __init
1083 init_cifs(void)
1084 {
1085         int rc = 0;
1086         cifs_proc_init();
1087         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1088 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1089         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1090         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1091 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1092 /*
1093  *  Initialize Global counters
1094  */
1095         atomic_set(&sesInfoAllocCount, 0);
1096         atomic_set(&tconInfoAllocCount, 0);
1097         atomic_set(&tcpSesAllocCount, 0);
1098         atomic_set(&tcpSesReconnectCount, 0);
1099         atomic_set(&tconInfoReconnectCount, 0);
1100
1101         atomic_set(&bufAllocCount, 0);
1102         atomic_set(&smBufAllocCount, 0);
1103 #ifdef CONFIG_CIFS_STATS2
1104         atomic_set(&totBufAllocCount, 0);
1105         atomic_set(&totSmBufAllocCount, 0);
1106 #endif /* CONFIG_CIFS_STATS2 */
1107
1108         atomic_set(&midCount, 0);
1109         GlobalCurrentXid = 0;
1110         GlobalTotalActiveXid = 0;
1111         GlobalMaxActiveXid = 0;
1112         spin_lock_init(&cifs_tcp_ses_lock);
1113         spin_lock_init(&cifs_file_list_lock);
1114         spin_lock_init(&GlobalMid_Lock);
1115
1116         if (cifs_max_pending < 2) {
1117                 cifs_max_pending = 2;
1118                 cFYI(1, "cifs_max_pending set to min of 2");
1119         } else if (cifs_max_pending > 256) {
1120                 cifs_max_pending = 256;
1121                 cFYI(1, "cifs_max_pending set to max of 256");
1122         }
1123
1124         rc = cifs_fscache_register();
1125         if (rc)
1126                 goto out_clean_proc;
1127
1128         rc = cifs_init_inodecache();
1129         if (rc)
1130                 goto out_unreg_fscache;
1131
1132         rc = cifs_init_mids();
1133         if (rc)
1134                 goto out_destroy_inodecache;
1135
1136         rc = cifs_init_request_bufs();
1137         if (rc)
1138                 goto out_destroy_mids;
1139
1140 #ifdef CONFIG_CIFS_UPCALL
1141         rc = register_key_type(&cifs_spnego_key_type);
1142         if (rc)
1143                 goto out_destroy_request_bufs;
1144 #endif /* CONFIG_CIFS_UPCALL */
1145
1146 #ifdef CONFIG_CIFS_ACL
1147         rc = init_cifs_idmap();
1148         if (rc)
1149                 goto out_register_key_type;
1150 #endif /* CONFIG_CIFS_ACL */
1151
1152         rc = register_filesystem(&cifs_fs_type);
1153         if (rc)
1154                 goto out_init_cifs_idmap;
1155
1156         return 0;
1157
1158 out_init_cifs_idmap:
1159 #ifdef CONFIG_CIFS_ACL
1160         exit_cifs_idmap();
1161 out_register_key_type:
1162 #endif
1163 #ifdef CONFIG_CIFS_UPCALL
1164         unregister_key_type(&cifs_spnego_key_type);
1165 out_destroy_request_bufs:
1166 #endif
1167         cifs_destroy_request_bufs();
1168 out_destroy_mids:
1169         cifs_destroy_mids();
1170 out_destroy_inodecache:
1171         cifs_destroy_inodecache();
1172 out_unreg_fscache:
1173         cifs_fscache_unregister();
1174 out_clean_proc:
1175         cifs_proc_clean();
1176         return rc;
1177 }
1178
1179 static void __exit
1180 exit_cifs(void)
1181 {
1182         cFYI(DBG2, "exit_cifs");
1183         cifs_proc_clean();
1184         cifs_fscache_unregister();
1185 #ifdef CONFIG_CIFS_DFS_UPCALL
1186         cifs_dfs_release_automount_timer();
1187 #endif
1188 #ifdef CONFIG_CIFS_ACL
1189         cifs_destroy_idmaptrees();
1190         exit_cifs_idmap();
1191 #endif
1192 #ifdef CONFIG_CIFS_UPCALL
1193         unregister_key_type(&cifs_spnego_key_type);
1194 #endif
1195         unregister_filesystem(&cifs_fs_type);
1196         cifs_destroy_inodecache();
1197         cifs_destroy_mids();
1198         cifs_destroy_request_bufs();
1199 }
1200
1201 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1202 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1203 MODULE_DESCRIPTION
1204     ("VFS to access servers complying with the SNIA CIFS Specification "
1205      "e.g. Samba and Windows");
1206 MODULE_VERSION(CIFS_VERSION);
1207 module_init(init_cifs)
1208 module_exit(exit_cifs)