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 vfsmount *m)
 347 {
 348         struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_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%o,dir_mode=0%o",
 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 (m->mnt_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_STRICT_IO)
 440                 seq_printf(s, ",strictcache");
 441
 442         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 443         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 444         /* convert actimeo and display it in seconds */
 445                 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 446
 447         return 0;
 448 }
 449
 450 static void cifs_umount_begin(struct super_block *sb)
 451 {
 452         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 453         struct cifs_tcon *tcon;
 454
 455         if (cifs_sb == NULL)
 456                 return;
 457
 458         tcon = cifs_sb_master_tcon(cifs_sb);
 459
 460         spin_lock(&cifs_tcp_ses_lock);
 461         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 462                 /* we have other mounts to same share or we have
 463                    already tried to force umount this and woken up
 464                    all waiting network requests, nothing to do */
 465                 spin_unlock(&cifs_tcp_ses_lock);
 466                 return;
 467         } else if (tcon->tc_count == 1)
 468                 tcon->tidStatus = CifsExiting;
 469         spin_unlock(&cifs_tcp_ses_lock);
 470
 471         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 472         /* cancel_notify_requests(tcon); */
 473         if (tcon->ses && tcon->ses->server) {
 474                 cFYI(1, "wake up tasks now - umount begin not complete");
 475                 wake_up_all(&tcon->ses->server->request_q);
 476                 wake_up_all(&tcon->ses->server->response_q);
 477                 msleep(1); /* yield */
 478                 /* we have to kick the requests once more */
 479                 wake_up_all(&tcon->ses->server->response_q);
 480                 msleep(1);
 481         }
 482
 483         return;
 484 }
 485
 486 #ifdef CONFIG_CIFS_STATS2
 487 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 488 {
 489         /* BB FIXME */
 490         return 0;
 491 }
 492 #endif
 493
 494 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 495 {
 496         *flags |= MS_NODIRATIME;
 497         return 0;
 498 }
 499
 500 static int cifs_drop_inode(struct inode *inode)
 501 {
 502         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 503
 504         /* no serverino => unconditional eviction */
 505         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 506                 generic_drop_inode(inode);
 507 }
 508
 509 static const struct super_operations cifs_super_ops = {
 510         .statfs = cifs_statfs,
 511         .alloc_inode = cifs_alloc_inode,
 512         .destroy_inode = cifs_destroy_inode,
 513         .drop_inode     = cifs_drop_inode,
 514         .evict_inode    = cifs_evict_inode,
 515 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 516         function unless later we add lazy close of inodes or unless the
 517         kernel forgets to call us with the same number of releases (closes)
 518         as opens */
 519         .show_options = cifs_show_options,
 520         .umount_begin   = cifs_umount_begin,
 521         .remount_fs = cifs_remount,
 522 #ifdef CONFIG_CIFS_STATS2
 523         .show_stats = cifs_show_stats,
 524 #endif
 525 };
 526
 527 /*
 528  * Get root dentry from superblock according to prefix path mount option.
 529  * Return dentry with refcount + 1 on success and NULL otherwise.
 530  */
 531 static struct dentry *
 532 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 533 {
 534         struct dentry *dentry;
 535         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 536         char *full_path = NULL;
 537         char *s, *p;
 538         char sep;
 539
 540         full_path = cifs_build_path_to_root(vol, cifs_sb,
 541                                             cifs_sb_master_tcon(cifs_sb));
 542         if (full_path == NULL)
 543                 return ERR_PTR(-ENOMEM);
 544
 545         cFYI(1, "Get root dentry for %s", full_path);
 546
 547         sep = CIFS_DIR_SEP(cifs_sb);
 548         dentry = dget(sb->s_root);
 549         p = s = full_path;
 550
 551         do {
 552                 struct inode *dir = dentry->d_inode;
 553                 struct dentry *child;
 554
 555                 if (!dir) {
 556                         dput(dentry);
 557                         dentry = ERR_PTR(-ENOENT);
 558                         break;
 559                 }
 560
 561                 /* skip separators */
 562                 while (*s == sep)
 563                         s++;
 564                 if (!*s)
 565                         break;
 566                 p = s++;
 567                 /* next separator */
 568                 while (*s && *s != sep)
 569                         s++;
 570
 571                 mutex_lock(&dir->i_mutex);
 572                 child = lookup_one_len(p, dentry, s - p);
 573                 mutex_unlock(&dir->i_mutex);
 574                 dput(dentry);
 575                 dentry = child;
 576         } while (!IS_ERR(dentry));
 577         kfree(full_path);
 578         return dentry;
 579 }
 580
 581 static int cifs_set_super(struct super_block *sb, void *data)
 582 {
 583         struct cifs_mnt_data *mnt_data = data;
 584         sb->s_fs_info = mnt_data->cifs_sb;
 585         return set_anon_super(sb, NULL);
 586 }
 587
 588 static struct dentry *
 589 cifs_do_mount(struct file_system_type *fs_type,
 590               int flags, const char *dev_name, void *data)
 591 {
 592         int rc;
 593         struct super_block *sb;
 594         struct cifs_sb_info *cifs_sb;
 595         struct smb_vol *volume_info;
 596         struct cifs_mnt_data mnt_data;
 597         struct dentry *root;
 598
 599         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 600
 601         volume_info = cifs_get_volume_info((char *)data, dev_name);
 602         if (IS_ERR(volume_info))
 603                 return ERR_CAST(volume_info);
 604
 605         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 606         if (cifs_sb == NULL) {
 607                 root = ERR_PTR(-ENOMEM);
 608                 goto out_nls;
 609         }
 610
 611         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 612         if (cifs_sb->mountdata == NULL) {
 613                 root = ERR_PTR(-ENOMEM);
 614                 goto out_cifs_sb;
 615         }
 616
 617         cifs_setup_cifs_sb(volume_info, cifs_sb);
 618
 619         rc = cifs_mount(cifs_sb, volume_info);
 620         if (rc) {
 621                 if (!(flags & MS_SILENT))
 622                         cERROR(1, "cifs_mount failed w/return code = %d", rc);
 623                 root = ERR_PTR(rc);
 624                 goto out_mountdata;
 625         }
 626
 627         mnt_data.vol = volume_info;
 628         mnt_data.cifs_sb = cifs_sb;
 629         mnt_data.flags = flags;
 630
 631         sb = sget(fs_type, cifs_match_super, cifs_set_super, &mnt_data);
 632         if (IS_ERR(sb)) {
 633                 root = ERR_CAST(sb);
 634                 cifs_umount(cifs_sb);
 635                 goto out;
 636         }
 637
 638         if (sb->s_root) {
 639                 cFYI(1, "Use existing superblock");
 640                 cifs_umount(cifs_sb);
 641         } else {
 642                 sb->s_flags = flags;
 643                 /* BB should we make this contingent on mount parm? */
 644                 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 645
 646                 rc = cifs_read_super(sb);
 647                 if (rc) {
 648                         root = ERR_PTR(rc);
 649                         goto out_super;
 650                 }
 651
 652                 sb->s_flags |= MS_ACTIVE;
 653         }
 654
 655         root = cifs_get_root(volume_info, sb);
 656         if (IS_ERR(root))
 657                 goto out_super;
 658
 659         cFYI(1, "dentry root is: %p", root);
 660         goto out;
 661
 662 out_super:
 663         deactivate_locked_super(sb);
 664 out:
 665         cifs_cleanup_volume_info(volume_info);
 666         return root;
 667
 668 out_mountdata:
 669         kfree(cifs_sb->mountdata);
 670 out_cifs_sb:
 671         kfree(cifs_sb);
 672 out_nls:
 673         unload_nls(volume_info->local_nls);
 674         goto out;
 675 }
 676
 677 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 678                                    unsigned long nr_segs, loff_t pos)
 679 {
 680         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 681         ssize_t written;
 682         int rc;
 683
 684         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 685
 686         if (CIFS_I(inode)->clientCanCacheAll)
 687                 return written;
 688
 689         rc = filemap_fdatawrite(inode->i_mapping);
 690         if (rc)
 691                 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
 692
 693         return written;
 694 }
 695
 696 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 697 {
 698         /*
 699          * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 700          * the cached file length
 701          */
 702         if (origin != SEEK_SET || origin != SEEK_CUR) {
 703                 int rc;
 704                 struct inode *inode = file->f_path.dentry->d_inode;
 705
 706                 /*
 707                  * We need to be sure that all dirty pages are written and the
 708                  * server has the newest file length.
 709                  */
 710                 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
 711                     inode->i_mapping->nrpages != 0) {
 712                         rc = filemap_fdatawait(inode->i_mapping);
 713                         if (rc) {
 714                                 mapping_set_error(inode->i_mapping, rc);
 715                                 return rc;
 716                         }
 717                 }
 718                 /*
 719                  * Some applications poll for the file length in this strange
 720                  * way so we must seek to end on non-oplocked files by
 721                  * setting the revalidate time to zero.
 722                  */
 723                 CIFS_I(inode)->time = 0;
 724
 725                 rc = cifs_revalidate_file_attr(file);
 726                 if (rc < 0)
 727                         return (loff_t)rc;
 728         }
 729         return generic_file_llseek_unlocked(file, offset, origin);
 730 }
 731
 732 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 733 {
 734         /* note that this is called by vfs setlease with lock_flocks held
 735            to protect *lease from going away */
 736         struct inode *inode = file->f_path.dentry->d_inode;
 737         struct cifsFileInfo *cfile = file->private_data;
 738
 739         if (!(S_ISREG(inode->i_mode)))
 740                 return -EINVAL;
 741
 742         /* check if file is oplocked */
 743         if (((arg == F_RDLCK) &&
 744                 (CIFS_I(inode)->clientCanCacheRead)) ||
 745             ((arg == F_WRLCK) &&
 746                 (CIFS_I(inode)->clientCanCacheAll)))
 747                 return generic_setlease(file, arg, lease);
 748         else if (tlink_tcon(cfile->tlink)->local_lease &&
 749                  !CIFS_I(inode)->clientCanCacheRead)
 750                 /* If the server claims to support oplock on this
 751                    file, then we still need to check oplock even
 752                    if the local_lease mount option is set, but there
 753                    are servers which do not support oplock for which
 754                    this mount option may be useful if the user
 755                    knows that the file won't be changed on the server
 756                    by anyone else */
 757                 return generic_setlease(file, arg, lease);
 758         else
 759                 return -EAGAIN;
 760 }
 761
 762 struct file_system_type cifs_fs_type = {
 763         .owner = THIS_MODULE,
 764         .name = "cifs",
 765         .mount = cifs_do_mount,
 766         .kill_sb = cifs_kill_sb,
 767         /*  .fs_flags */
 768 };
 769 const struct inode_operations cifs_dir_inode_ops = {
 770         .create = cifs_create,
 771         .lookup = cifs_lookup,
 772         .getattr = cifs_getattr,
 773         .unlink = cifs_unlink,
 774         .link = cifs_hardlink,
 775         .mkdir = cifs_mkdir,
 776         .rmdir = cifs_rmdir,
 777         .rename = cifs_rename,
 778         .permission = cifs_permission,
 779 /*      revalidate:cifs_revalidate,   */
 780         .setattr = cifs_setattr,
 781         .symlink = cifs_symlink,
 782         .mknod   = cifs_mknod,
 783 #ifdef CONFIG_CIFS_XATTR
 784         .setxattr = cifs_setxattr,
 785         .getxattr = cifs_getxattr,
 786         .listxattr = cifs_listxattr,
 787         .removexattr = cifs_removexattr,
 788 #endif
 789 };
 790
 791 const struct inode_operations cifs_file_inode_ops = {
 792 /*      revalidate:cifs_revalidate, */
 793         .setattr = cifs_setattr,
 794         .getattr = cifs_getattr, /* do we need this anymore? */
 795         .rename = cifs_rename,
 796         .permission = cifs_permission,
 797 #ifdef CONFIG_CIFS_XATTR
 798         .setxattr = cifs_setxattr,
 799         .getxattr = cifs_getxattr,
 800         .listxattr = cifs_listxattr,
 801         .removexattr = cifs_removexattr,
 802 #endif
 803 };
 804
 805 const struct inode_operations cifs_symlink_inode_ops = {
 806         .readlink = generic_readlink,
 807         .follow_link = cifs_follow_link,
 808         .put_link = cifs_put_link,
 809         .permission = cifs_permission,
 810         /* BB add the following two eventually */
 811         /* revalidate: cifs_revalidate,
 812            setattr:    cifs_notify_change, *//* BB do we need notify change */
 813 #ifdef CONFIG_CIFS_XATTR
 814         .setxattr = cifs_setxattr,
 815         .getxattr = cifs_getxattr,
 816         .listxattr = cifs_listxattr,
 817         .removexattr = cifs_removexattr,
 818 #endif
 819 };
 820
 821 const struct file_operations cifs_file_ops = {
 822         .read = do_sync_read,
 823         .write = do_sync_write,
 824         .aio_read = generic_file_aio_read,
 825         .aio_write = cifs_file_aio_write,
 826         .open = cifs_open,
 827         .release = cifs_close,
 828         .lock = cifs_lock,
 829         .fsync = cifs_fsync,
 830         .flush = cifs_flush,
 831         .mmap  = cifs_file_mmap,
 832         .splice_read = generic_file_splice_read,
 833         .llseek = cifs_llseek,
 834 #ifdef CONFIG_CIFS_POSIX
 835         .unlocked_ioctl = cifs_ioctl,
 836 #endif /* CONFIG_CIFS_POSIX */
 837         .setlease = cifs_setlease,
 838 };
 839
 840 const struct file_operations cifs_file_strict_ops = {
 841         .read = do_sync_read,
 842         .write = do_sync_write,
 843         .aio_read = cifs_strict_readv,
 844         .aio_write = cifs_strict_writev,
 845         .open = cifs_open,
 846         .release = cifs_close,
 847         .lock = cifs_lock,
 848         .fsync = cifs_strict_fsync,
 849         .flush = cifs_flush,
 850         .mmap = cifs_file_strict_mmap,
 851         .splice_read = generic_file_splice_read,
 852         .llseek = cifs_llseek,
 853 #ifdef CONFIG_CIFS_POSIX
 854         .unlocked_ioctl = cifs_ioctl,
 855 #endif /* CONFIG_CIFS_POSIX */
 856         .setlease = cifs_setlease,
 857 };
 858
 859 const struct file_operations cifs_file_direct_ops = {
 860         /* BB reevaluate whether they can be done with directio, no cache */
 861         .read = do_sync_read,
 862         .write = do_sync_write,
 863         .aio_read = cifs_user_readv,
 864         .aio_write = cifs_user_writev,
 865         .open = cifs_open,
 866         .release = cifs_close,
 867         .lock = cifs_lock,
 868         .fsync = cifs_fsync,
 869         .flush = cifs_flush,
 870         .mmap = cifs_file_mmap,
 871         .splice_read = generic_file_splice_read,
 872 #ifdef CONFIG_CIFS_POSIX
 873         .unlocked_ioctl  = cifs_ioctl,
 874 #endif /* CONFIG_CIFS_POSIX */
 875         .llseek = cifs_llseek,
 876         .setlease = cifs_setlease,
 877 };
 878
 879 const struct file_operations cifs_file_nobrl_ops = {
 880         .read = do_sync_read,
 881         .write = do_sync_write,
 882         .aio_read = generic_file_aio_read,
 883         .aio_write = cifs_file_aio_write,
 884         .open = cifs_open,
 885         .release = cifs_close,
 886         .fsync = cifs_fsync,
 887         .flush = cifs_flush,
 888         .mmap  = cifs_file_mmap,
 889         .splice_read = generic_file_splice_read,
 890         .llseek = cifs_llseek,
 891 #ifdef CONFIG_CIFS_POSIX
 892         .unlocked_ioctl = cifs_ioctl,
 893 #endif /* CONFIG_CIFS_POSIX */
 894         .setlease = cifs_setlease,
 895 };
 896
 897 const struct file_operations cifs_file_strict_nobrl_ops = {
 898         .read = do_sync_read,
 899         .write = do_sync_write,
 900         .aio_read = cifs_strict_readv,
 901         .aio_write = cifs_strict_writev,
 902         .open = cifs_open,
 903         .release = cifs_close,
 904         .fsync = cifs_strict_fsync,
 905         .flush = cifs_flush,
 906         .mmap = cifs_file_strict_mmap,
 907         .splice_read = generic_file_splice_read,
 908         .llseek = cifs_llseek,
 909 #ifdef CONFIG_CIFS_POSIX
 910         .unlocked_ioctl = cifs_ioctl,
 911 #endif /* CONFIG_CIFS_POSIX */
 912         .setlease = cifs_setlease,
 913 };
 914
 915 const struct file_operations cifs_file_direct_nobrl_ops = {
 916         /* BB reevaluate whether they can be done with directio, no cache */
 917         .read = do_sync_read,
 918         .write = do_sync_write,
 919         .aio_read = cifs_user_readv,
 920         .aio_write = cifs_user_writev,
 921         .open = cifs_open,
 922         .release = cifs_close,
 923         .fsync = cifs_fsync,
 924         .flush = cifs_flush,
 925         .mmap = cifs_file_mmap,
 926         .splice_read = generic_file_splice_read,
 927 #ifdef CONFIG_CIFS_POSIX
 928         .unlocked_ioctl  = cifs_ioctl,
 929 #endif /* CONFIG_CIFS_POSIX */
 930         .llseek = cifs_llseek,
 931         .setlease = cifs_setlease,
 932 };
 933
 934 const struct file_operations cifs_dir_ops = {
 935         .readdir = cifs_readdir,
 936         .release = cifs_closedir,
 937         .read    = generic_read_dir,
 938         .unlocked_ioctl  = cifs_ioctl,
 939         .llseek = generic_file_llseek,
 940 };
 941
 942 static void
 943 cifs_init_once(void *inode)
 944 {
 945         struct cifsInodeInfo *cifsi = inode;
 946
 947         inode_init_once(&cifsi->vfs_inode);
 948         INIT_LIST_HEAD(&cifsi->llist);
 949         mutex_init(&cifsi->lock_mutex);
 950 }
 951
 952 static int
 953 cifs_init_inodecache(void)
 954 {
 955         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 956                                               sizeof(struct cifsInodeInfo),
 957                                               0, (SLAB_RECLAIM_ACCOUNT|
 958                                                 SLAB_MEM_SPREAD),
 959                                               cifs_init_once);
 960         if (cifs_inode_cachep == NULL)
 961                 return -ENOMEM;
 962
 963         return 0;
 964 }
 965
 966 static void
 967 cifs_destroy_inodecache(void)
 968 {
 969         kmem_cache_destroy(cifs_inode_cachep);
 970 }
 971
 972 static int
 973 cifs_init_request_bufs(void)
 974 {
 975         if (CIFSMaxBufSize < 8192) {
 976         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 977         Unicode path name has to fit in any SMB/CIFS path based frames */
 978                 CIFSMaxBufSize = 8192;
 979         } else if (CIFSMaxBufSize > 1024*127) {
 980                 CIFSMaxBufSize = 1024 * 127;
 981         } else {
 982                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 983         }
 984 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 985         cifs_req_cachep = kmem_cache_create("cifs_request",
 986                                             CIFSMaxBufSize +
 987                                             MAX_CIFS_HDR_SIZE, 0,
 988                                             SLAB_HWCACHE_ALIGN, NULL);
 989         if (cifs_req_cachep == NULL)
 990                 return -ENOMEM;
 991
 992         if (cifs_min_rcv < 1)
 993                 cifs_min_rcv = 1;
 994         else if (cifs_min_rcv > 64) {
 995                 cifs_min_rcv = 64;
 996                 cERROR(1, "cifs_min_rcv set to maximum (64)");
 997         }
 998
 999         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1000                                                   cifs_req_cachep);
1001
1002         if (cifs_req_poolp == NULL) {
1003                 kmem_cache_destroy(cifs_req_cachep);
1004                 return -ENOMEM;
1005         }
1006         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1007         almost all handle based requests (but not write response, nor is it
1008         sufficient for path based requests).  A smaller size would have
1009         been more efficient (compacting multiple slab items on one 4k page)
1010         for the case in which debug was on, but this larger size allows
1011         more SMBs to use small buffer alloc and is still much more
1012         efficient to alloc 1 per page off the slab compared to 17K (5page)
1013         alloc of large cifs buffers even when page debugging is on */
1014         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1015                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1016                         NULL);
1017         if (cifs_sm_req_cachep == NULL) {
1018                 mempool_destroy(cifs_req_poolp);
1019                 kmem_cache_destroy(cifs_req_cachep);
1020                 return -ENOMEM;
1021         }
1022
1023         if (cifs_min_small < 2)
1024                 cifs_min_small = 2;
1025         else if (cifs_min_small > 256) {
1026                 cifs_min_small = 256;
1027                 cFYI(1, "cifs_min_small set to maximum (256)");
1028         }
1029
1030         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1031                                                      cifs_sm_req_cachep);
1032
1033         if (cifs_sm_req_poolp == NULL) {
1034                 mempool_destroy(cifs_req_poolp);
1035                 kmem_cache_destroy(cifs_req_cachep);
1036                 kmem_cache_destroy(cifs_sm_req_cachep);
1037                 return -ENOMEM;
1038         }
1039
1040         return 0;
1041 }
1042
1043 static void
1044 cifs_destroy_request_bufs(void)
1045 {
1046         mempool_destroy(cifs_req_poolp);
1047         kmem_cache_destroy(cifs_req_cachep);
1048         mempool_destroy(cifs_sm_req_poolp);
1049         kmem_cache_destroy(cifs_sm_req_cachep);
1050 }
1051
1052 static int
1053 cifs_init_mids(void)
1054 {
1055         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1056                                             sizeof(struct mid_q_entry), 0,
1057                                             SLAB_HWCACHE_ALIGN, NULL);
1058         if (cifs_mid_cachep == NULL)
1059                 return -ENOMEM;
1060
1061         /* 3 is a reasonable minimum number of simultaneous operations */
1062         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1063         if (cifs_mid_poolp == NULL) {
1064                 kmem_cache_destroy(cifs_mid_cachep);
1065                 return -ENOMEM;
1066         }
1067
1068         return 0;
1069 }
1070
1071 static void
1072 cifs_destroy_mids(void)
1073 {
1074         mempool_destroy(cifs_mid_poolp);
1075         kmem_cache_destroy(cifs_mid_cachep);
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 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1085         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1086         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1087 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1088 /*
1089  *  Initialize Global counters
1090  */
1091         atomic_set(&sesInfoAllocCount, 0);
1092         atomic_set(&tconInfoAllocCount, 0);
1093         atomic_set(&tcpSesAllocCount, 0);
1094         atomic_set(&tcpSesReconnectCount, 0);
1095         atomic_set(&tconInfoReconnectCount, 0);
1096
1097         atomic_set(&bufAllocCount, 0);
1098         atomic_set(&smBufAllocCount, 0);
1099 #ifdef CONFIG_CIFS_STATS2
1100         atomic_set(&totBufAllocCount, 0);
1101         atomic_set(&totSmBufAllocCount, 0);
1102 #endif /* CONFIG_CIFS_STATS2 */
1103
1104         atomic_set(&midCount, 0);
1105         GlobalCurrentXid = 0;
1106         GlobalTotalActiveXid = 0;
1107         GlobalMaxActiveXid = 0;
1108         spin_lock_init(&cifs_tcp_ses_lock);
1109         spin_lock_init(&cifs_file_list_lock);
1110         spin_lock_init(&GlobalMid_Lock);
1111
1112         if (cifs_max_pending < 2) {
1113                 cifs_max_pending = 2;
1114                 cFYI(1, "cifs_max_pending set to min of 2");
1115         } else if (cifs_max_pending > 256) {
1116                 cifs_max_pending = 256;
1117                 cFYI(1, "cifs_max_pending set to max of 256");
1118         }
1119
1120         rc = cifs_fscache_register();
1121         if (rc)
1122                 goto out_clean_proc;
1123
1124         rc = cifs_init_inodecache();
1125         if (rc)
1126                 goto out_unreg_fscache;
1127
1128         rc = cifs_init_mids();
1129         if (rc)
1130                 goto out_destroy_inodecache;
1131
1132         rc = cifs_init_request_bufs();
1133         if (rc)
1134                 goto out_destroy_mids;
1135
1136 #ifdef CONFIG_CIFS_UPCALL
1137         rc = register_key_type(&cifs_spnego_key_type);
1138         if (rc)
1139                 goto out_destroy_request_bufs;
1140 #endif /* CONFIG_CIFS_UPCALL */
1141
1142 #ifdef CONFIG_CIFS_ACL
1143         rc = init_cifs_idmap();
1144         if (rc)
1145                 goto out_register_key_type;
1146 #endif /* CONFIG_CIFS_ACL */
1147
1148         rc = register_filesystem(&cifs_fs_type);
1149         if (rc)
1150                 goto out_init_cifs_idmap;
1151
1152         return 0;
1153
1154 out_init_cifs_idmap:
1155 #ifdef CONFIG_CIFS_ACL
1156         exit_cifs_idmap();
1157 out_register_key_type:
1158 #endif
1159 #ifdef CONFIG_CIFS_UPCALL
1160         unregister_key_type(&cifs_spnego_key_type);
1161 out_destroy_request_bufs:
1162 #endif
1163         cifs_destroy_request_bufs();
1164 out_destroy_mids:
1165         cifs_destroy_mids();
1166 out_destroy_inodecache:
1167         cifs_destroy_inodecache();
1168 out_unreg_fscache:
1169         cifs_fscache_unregister();
1170 out_clean_proc:
1171         cifs_proc_clean();
1172         return rc;
1173 }
1174
1175 static void __exit
1176 exit_cifs(void)
1177 {
1178         cFYI(DBG2, "exit_cifs");
1179         cifs_proc_clean();
1180         cifs_fscache_unregister();
1181 #ifdef CONFIG_CIFS_DFS_UPCALL
1182         cifs_dfs_release_automount_timer();
1183 #endif
1184 #ifdef CONFIG_CIFS_ACL
1185         cifs_destroy_idmaptrees();
1186         exit_cifs_idmap();
1187 #endif
1188 #ifdef CONFIG_CIFS_UPCALL
1189         unregister_key_type(&cifs_spnego_key_type);
1190 #endif
1191         unregister_filesystem(&cifs_fs_type);
1192         cifs_destroy_inodecache();
1193         cifs_destroy_mids();
1194         cifs_destroy_request_bufs();
1195 }
1196
1197 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1198 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1199 MODULE_DESCRIPTION
1200     ("VFS to access servers complying with the SNIA CIFS Specification "
1201      "e.g. Samba and Windows");
1202 MODULE_VERSION(CIFS_VERSION);
1203 module_init(init_cifs)
1204 module_exit(exit_cifs)