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