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 global_secflags = CIFSSEC_DEF;
  60 /* unsigned int ntlmv2_support = 0; */
  61 unsigned int sign_CIFS_PDUs = 1;
  62 static const struct super_operations cifs_super_ops;
  63 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  64 module_param(CIFSMaxBufSize, int, 0);
  65 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  66                                  "Default: 16384 Range: 8192 to 130048");
  67 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  68 module_param(cifs_min_rcv, int, 0);
  69 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  70                                 "1 to 64");
  71 unsigned int cifs_min_small = 30;
  72 module_param(cifs_min_small, int, 0);
  73 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  74                                  "Range: 2 to 256");
  75 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  76 module_param(cifs_max_pending, int, 0444);
  77 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  78                                    "Default: 32767 Range: 2 to 32767.");
  79 module_param(enable_oplocks, bool, 0644);
  80 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks (bool). Default:"
  81                                  "y/Y/1");
  82
  83 extern mempool_t *cifs_sm_req_poolp;
  84 extern mempool_t *cifs_req_poolp;
  85 extern mempool_t *cifs_mid_poolp;
  86
  87 struct workqueue_struct *cifsiod_wq;
  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                 goto out_no_root;
 119         }
 120
 121         sb->s_root = d_make_root(inode);
 122         if (!sb->s_root) {
 123                 rc = -ENOMEM;
 124                 goto out_no_root;
 125         }
 126
 127         /* do that *after* d_make_root() - we want NULL ->d_op for root here */
 128         if (cifs_sb_master_tcon(cifs_sb)->nocase)
 129                 sb->s_d_op = &cifs_ci_dentry_ops;
 130         else
 131                 sb->s_d_op = &cifs_dentry_ops;
 132
 133 #ifdef CONFIG_CIFS_NFSD_EXPORT
 134         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 135                 cFYI(1, "export ops supported");
 136                 sb->s_export_op = &cifs_export_ops;
 137         }
 138 #endif /* CONFIG_CIFS_NFSD_EXPORT */
 139
 140         return 0;
 141
 142 out_no_root:
 143         cERROR(1, "cifs_read_super: get root inode failed");
 144         return rc;
 145 }
 146
 147 static void cifs_kill_sb(struct super_block *sb)
 148 {
 149         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 150         kill_anon_super(sb);
 151         cifs_umount(cifs_sb);
 152 }
 153
 154 static int
 155 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 156 {
 157         struct super_block *sb = dentry->d_sb;
 158         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 159         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 160         int rc = -EOPNOTSUPP;
 161         int xid;
 162
 163         xid = GetXid();
 164
 165         buf->f_type = CIFS_MAGIC_NUMBER;
 166
 167         /*
 168          * PATH_MAX may be too long - it would presumably be total path,
 169          * but note that some servers (includinng Samba 3) have a shorter
 170          * maximum path.
 171          *
 172          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 173          */
 174         buf->f_namelen = PATH_MAX;
 175         buf->f_files = 0;       /* undefined */
 176         buf->f_ffree = 0;       /* unlimited */
 177
 178         /*
 179          * We could add a second check for a QFS Unix capability bit
 180          */
 181         if ((tcon->ses->capabilities & CAP_UNIX) &&
 182             (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
 183                 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
 184
 185         /*
 186          * Only need to call the old QFSInfo if failed on newer one,
 187          * e.g. by OS/2.
 188          **/
 189         if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
 190                 rc = CIFSSMBQFSInfo(xid, tcon, buf);
 191
 192         /*
 193          * Some old Windows servers also do not support level 103, retry with
 194          * older level one if old server failed the previous call or we
 195          * bypassed it because we detected that this was an older LANMAN sess
 196          */
 197         if (rc)
 198                 rc = SMBOldQFSInfo(xid, tcon, buf);
 199
 200         FreeXid(xid);
 201         return 0;
 202 }
 203
 204 static int cifs_permission(struct inode *inode, int mask)
 205 {
 206         struct cifs_sb_info *cifs_sb;
 207
 208         cifs_sb = CIFS_SB(inode->i_sb);
 209
 210         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 211                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 212                         return -EACCES;
 213                 else
 214                         return 0;
 215         } else /* file mode might have been restricted at mount time
 216                 on the client (above and beyond ACL on servers) for
 217                 servers which do not support setting and viewing mode bits,
 218                 so allowing client to check permissions is useful */
 219                 return generic_permission(inode, mask);
 220 }
 221
 222 static struct kmem_cache *cifs_inode_cachep;
 223 static struct kmem_cache *cifs_req_cachep;
 224 static struct kmem_cache *cifs_mid_cachep;
 225 static struct kmem_cache *cifs_sm_req_cachep;
 226 mempool_t *cifs_sm_req_poolp;
 227 mempool_t *cifs_req_poolp;
 228 mempool_t *cifs_mid_poolp;
 229
 230 static struct inode *
 231 cifs_alloc_inode(struct super_block *sb)
 232 {
 233         struct cifsInodeInfo *cifs_inode;
 234         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 235         if (!cifs_inode)
 236                 return NULL;
 237         cifs_inode->cifsAttrs = 0x20;   /* default */
 238         cifs_inode->time = 0;
 239         /* Until the file is open and we have gotten oplock
 240         info back from the server, can not assume caching of
 241         file data or metadata */
 242         cifs_set_oplock_level(cifs_inode, 0);
 243         cifs_inode->delete_pending = false;
 244         cifs_inode->invalid_mapping = false;
 245         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 246         cifs_inode->server_eof = 0;
 247         cifs_inode->uniqueid = 0;
 248         cifs_inode->createtime = 0;
 249
 250         /* Can not set i_flags here - they get immediately overwritten
 251            to zero by the VFS */
 252 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 253         INIT_LIST_HEAD(&cifs_inode->openFileList);
 254         return &cifs_inode->vfs_inode;
 255 }
 256
 257 static void cifs_i_callback(struct rcu_head *head)
 258 {
 259         struct inode *inode = container_of(head, struct inode, i_rcu);
 260         INIT_LIST_HEAD(&inode->i_dentry);
 261         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 262 }
 263
 264 static void
 265 cifs_destroy_inode(struct inode *inode)
 266 {
 267         call_rcu(&inode->i_rcu, cifs_i_callback);
 268 }
 269
 270 static void
 271 cifs_evict_inode(struct inode *inode)
 272 {
 273         truncate_inode_pages(&inode->i_data, 0);
 274         clear_inode(inode);
 275         cifs_fscache_release_inode_cookie(inode);
 276 }
 277
 278 static void
 279 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 280 {
 281         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 282         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 283
 284         seq_printf(s, ",addr=");
 285
 286         switch (server->dstaddr.ss_family) {
 287         case AF_INET:
 288                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 289                 break;
 290         case AF_INET6:
 291                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 292                 if (sa6->sin6_scope_id)
 293                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 294                 break;
 295         default:
 296                 seq_printf(s, "(unknown)");
 297         }
 298 }
 299
 300 static void
 301 cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server)
 302 {
 303         seq_printf(s, ",sec=");
 304
 305         switch (server->secType) {
 306         case LANMAN:
 307                 seq_printf(s, "lanman");
 308                 break;
 309         case NTLMv2:
 310                 seq_printf(s, "ntlmv2");
 311                 break;
 312         case NTLM:
 313                 seq_printf(s, "ntlm");
 314                 break;
 315         case Kerberos:
 316                 seq_printf(s, "krb5");
 317                 break;
 318         case RawNTLMSSP:
 319                 seq_printf(s, "ntlmssp");
 320                 break;
 321         default:
 322                 /* shouldn't ever happen */
 323                 seq_printf(s, "unknown");
 324                 break;
 325         }
 326
 327         if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
 328                 seq_printf(s, "i");
 329 }
 330
 331 static void
 332 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
 333 {
 334         seq_printf(s, ",cache=");
 335
 336         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
 337                 seq_printf(s, "strict");
 338         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 339                 seq_printf(s, "none");
 340         else
 341                 seq_printf(s, "loose");
 342 }
 343
 344 /*
 345  * cifs_show_options() is for displaying mount options in /proc/mounts.
 346  * Not all settable options are displayed but most of the important
 347  * ones are.
 348  */
 349 static int
 350 cifs_show_options(struct seq_file *s, struct dentry *root)
 351 {
 352         struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
 353         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 354         struct sockaddr *srcaddr;
 355         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 356
 357         seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
 358         cifs_show_security(s, tcon->ses->server);
 359         cifs_show_cache_flavor(s, cifs_sb);
 360
 361         seq_printf(s, ",unc=%s", tcon->treeName);
 362
 363         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 364                 seq_printf(s, ",multiuser");
 365         else if (tcon->ses->user_name)
 366                 seq_printf(s, ",username=%s", tcon->ses->user_name);
 367
 368         if (tcon->ses->domainName)
 369                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 370
 371         if (srcaddr->sa_family != AF_UNSPEC) {
 372                 struct sockaddr_in *saddr4;
 373                 struct sockaddr_in6 *saddr6;
 374                 saddr4 = (struct sockaddr_in *)srcaddr;
 375                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 376                 if (srcaddr->sa_family == AF_INET6)
 377                         seq_printf(s, ",srcaddr=%pI6c",
 378                                    &saddr6->sin6_addr);
 379                 else if (srcaddr->sa_family == AF_INET)
 380                         seq_printf(s, ",srcaddr=%pI4",
 381                                    &saddr4->sin_addr.s_addr);
 382                 else
 383                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 384                                    (int)(srcaddr->sa_family));
 385         }
 386
 387         seq_printf(s, ",uid=%u", cifs_sb->mnt_uid);
 388         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 389                 seq_printf(s, ",forceuid");
 390         else
 391                 seq_printf(s, ",noforceuid");
 392
 393         seq_printf(s, ",gid=%u", cifs_sb->mnt_gid);
 394         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 395                 seq_printf(s, ",forcegid");
 396         else
 397                 seq_printf(s, ",noforcegid");
 398
 399         cifs_show_address(s, tcon->ses->server);
 400
 401         if (!tcon->unix_ext)
 402                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 403                                            cifs_sb->mnt_file_mode,
 404                                            cifs_sb->mnt_dir_mode);
 405         if (tcon->seal)
 406                 seq_printf(s, ",seal");
 407         if (tcon->nocase)
 408                 seq_printf(s, ",nocase");
 409         if (tcon->retry)
 410                 seq_printf(s, ",hard");
 411         if (tcon->unix_ext)
 412                 seq_printf(s, ",unix");
 413         else
 414                 seq_printf(s, ",nounix");
 415         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 416                 seq_printf(s, ",posixpaths");
 417         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 418                 seq_printf(s, ",setuids");
 419         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 420                 seq_printf(s, ",serverino");
 421         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 422                 seq_printf(s, ",rwpidforward");
 423         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 424                 seq_printf(s, ",forcemand");
 425         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 426                 seq_printf(s, ",nouser_xattr");
 427         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 428                 seq_printf(s, ",mapchars");
 429         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 430                 seq_printf(s, ",sfu");
 431         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 432                 seq_printf(s, ",nobrl");
 433         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 434                 seq_printf(s, ",cifsacl");
 435         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 436                 seq_printf(s, ",dynperm");
 437         if (root->d_sb->s_flags & MS_POSIXACL)
 438                 seq_printf(s, ",acl");
 439         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 440                 seq_printf(s, ",mfsymlinks");
 441         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 442                 seq_printf(s, ",fsc");
 443         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 444                 seq_printf(s, ",nostrictsync");
 445         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 446                 seq_printf(s, ",noperm");
 447         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 448                 seq_printf(s, ",backupuid=%u", cifs_sb->mnt_backupuid);
 449         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 450                 seq_printf(s, ",backupgid=%u", cifs_sb->mnt_backupgid);
 451
 452         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 453         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 454         /* convert actimeo and display it in seconds */
 455         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 456
 457         return 0;
 458 }
 459
 460 static void cifs_umount_begin(struct super_block *sb)
 461 {
 462         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 463         struct cifs_tcon *tcon;
 464
 465         if (cifs_sb == NULL)
 466                 return;
 467
 468         tcon = cifs_sb_master_tcon(cifs_sb);
 469
 470         spin_lock(&cifs_tcp_ses_lock);
 471         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 472                 /* we have other mounts to same share or we have
 473                    already tried to force umount this and woken up
 474                    all waiting network requests, nothing to do */
 475                 spin_unlock(&cifs_tcp_ses_lock);
 476                 return;
 477         } else if (tcon->tc_count == 1)
 478                 tcon->tidStatus = CifsExiting;
 479         spin_unlock(&cifs_tcp_ses_lock);
 480
 481         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 482         /* cancel_notify_requests(tcon); */
 483         if (tcon->ses && tcon->ses->server) {
 484                 cFYI(1, "wake up tasks now - umount begin not complete");
 485                 wake_up_all(&tcon->ses->server->request_q);
 486                 wake_up_all(&tcon->ses->server->response_q);
 487                 msleep(1); /* yield */
 488                 /* we have to kick the requests once more */
 489                 wake_up_all(&tcon->ses->server->response_q);
 490                 msleep(1);
 491         }
 492
 493         return;
 494 }
 495
 496 #ifdef CONFIG_CIFS_STATS2
 497 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 498 {
 499         /* BB FIXME */
 500         return 0;
 501 }
 502 #endif
 503
 504 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 505 {
 506         *flags |= MS_NODIRATIME;
 507         return 0;
 508 }
 509
 510 static int cifs_drop_inode(struct inode *inode)
 511 {
 512         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 513
 514         /* no serverino => unconditional eviction */
 515         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 516                 generic_drop_inode(inode);
 517 }
 518
 519 static const struct super_operations cifs_super_ops = {
 520         .statfs = cifs_statfs,
 521         .alloc_inode = cifs_alloc_inode,
 522         .destroy_inode = cifs_destroy_inode,
 523         .drop_inode     = cifs_drop_inode,
 524         .evict_inode    = cifs_evict_inode,
 525 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 526         function unless later we add lazy close of inodes or unless the
 527         kernel forgets to call us with the same number of releases (closes)
 528         as opens */
 529         .show_options = cifs_show_options,
 530         .umount_begin   = cifs_umount_begin,
 531         .remount_fs = cifs_remount,
 532 #ifdef CONFIG_CIFS_STATS2
 533         .show_stats = cifs_show_stats,
 534 #endif
 535 };
 536
 537 /*
 538  * Get root dentry from superblock according to prefix path mount option.
 539  * Return dentry with refcount + 1 on success and NULL otherwise.
 540  */
 541 static struct dentry *
 542 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 543 {
 544         struct dentry *dentry;
 545         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 546         char *full_path = NULL;
 547         char *s, *p;
 548         char sep;
 549
 550         full_path = cifs_build_path_to_root(vol, cifs_sb,
 551                                             cifs_sb_master_tcon(cifs_sb));
 552         if (full_path == NULL)
 553                 return ERR_PTR(-ENOMEM);
 554
 555         cFYI(1, "Get root dentry for %s", full_path);
 556
 557         sep = CIFS_DIR_SEP(cifs_sb);
 558         dentry = dget(sb->s_root);
 559         p = s = full_path;
 560
 561         do {
 562                 struct inode *dir = dentry->d_inode;
 563                 struct dentry *child;
 564
 565                 if (!dir) {
 566                         dput(dentry);
 567                         dentry = ERR_PTR(-ENOENT);
 568                         break;
 569                 }
 570
 571                 /* skip separators */
 572                 while (*s == sep)
 573                         s++;
 574                 if (!*s)
 575                         break;
 576                 p = s++;
 577                 /* next separator */
 578                 while (*s && *s != sep)
 579                         s++;
 580
 581                 mutex_lock(&dir->i_mutex);
 582                 child = lookup_one_len(p, dentry, s - p);
 583                 mutex_unlock(&dir->i_mutex);
 584                 dput(dentry);
 585                 dentry = child;
 586         } while (!IS_ERR(dentry));
 587         kfree(full_path);
 588         return dentry;
 589 }
 590
 591 static int cifs_set_super(struct super_block *sb, void *data)
 592 {
 593         struct cifs_mnt_data *mnt_data = data;
 594         sb->s_fs_info = mnt_data->cifs_sb;
 595         return set_anon_super(sb, NULL);
 596 }
 597
 598 static struct dentry *
 599 cifs_do_mount(struct file_system_type *fs_type,
 600               int flags, const char *dev_name, void *data)
 601 {
 602         int rc;
 603         struct super_block *sb;
 604         struct cifs_sb_info *cifs_sb;
 605         struct smb_vol *volume_info;
 606         struct cifs_mnt_data mnt_data;
 607         struct dentry *root;
 608
 609         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 610
 611         volume_info = cifs_get_volume_info((char *)data, dev_name);
 612         if (IS_ERR(volume_info))
 613                 return ERR_CAST(volume_info);
 614
 615         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 616         if (cifs_sb == NULL) {
 617                 root = ERR_PTR(-ENOMEM);
 618                 goto out_nls;
 619         }
 620
 621         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 622         if (cifs_sb->mountdata == NULL) {
 623                 root = ERR_PTR(-ENOMEM);
 624                 goto out_cifs_sb;
 625         }
 626
 627         cifs_setup_cifs_sb(volume_info, cifs_sb);
 628
 629         rc = cifs_mount(cifs_sb, volume_info);
 630         if (rc) {
 631                 if (!(flags & MS_SILENT))
 632                         cERROR(1, "cifs_mount failed w/return code = %d", rc);
 633                 root = ERR_PTR(rc);
 634                 goto out_mountdata;
 635         }
 636
 637         mnt_data.vol = volume_info;
 638         mnt_data.cifs_sb = cifs_sb;
 639         mnt_data.flags = flags;
 640
 641         sb = sget(fs_type, cifs_match_super, cifs_set_super, &mnt_data);
 642         if (IS_ERR(sb)) {
 643                 root = ERR_CAST(sb);
 644                 cifs_umount(cifs_sb);
 645                 goto out;
 646         }
 647
 648         if (sb->s_root) {
 649                 cFYI(1, "Use existing superblock");
 650                 cifs_umount(cifs_sb);
 651         } else {
 652                 sb->s_flags = flags;
 653                 /* BB should we make this contingent on mount parm? */
 654                 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 655
 656                 rc = cifs_read_super(sb);
 657                 if (rc) {
 658                         root = ERR_PTR(rc);
 659                         goto out_super;
 660                 }
 661
 662                 sb->s_flags |= MS_ACTIVE;
 663         }
 664
 665         root = cifs_get_root(volume_info, sb);
 666         if (IS_ERR(root))
 667                 goto out_super;
 668
 669         cFYI(1, "dentry root is: %p", root);
 670         goto out;
 671
 672 out_super:
 673         deactivate_locked_super(sb);
 674 out:
 675         cifs_cleanup_volume_info(volume_info);
 676         return root;
 677
 678 out_mountdata:
 679         kfree(cifs_sb->mountdata);
 680 out_cifs_sb:
 681         kfree(cifs_sb);
 682 out_nls:
 683         unload_nls(volume_info->local_nls);
 684         goto out;
 685 }
 686
 687 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 688                                    unsigned long nr_segs, loff_t pos)
 689 {
 690         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 691         ssize_t written;
 692         int rc;
 693
 694         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 695
 696         if (CIFS_I(inode)->clientCanCacheAll)
 697                 return written;
 698
 699         rc = filemap_fdatawrite(inode->i_mapping);
 700         if (rc)
 701                 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
 702
 703         return written;
 704 }
 705
 706 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 707 {
 708         /*
 709          * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 710          * the cached file length
 711          */
 712         if (origin != SEEK_SET && origin != SEEK_CUR) {
 713                 int rc;
 714                 struct inode *inode = file->f_path.dentry->d_inode;
 715
 716                 /*
 717                  * We need to be sure that all dirty pages are written and the
 718                  * server has the newest file length.
 719                  */
 720                 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
 721                     inode->i_mapping->nrpages != 0) {
 722                         rc = filemap_fdatawait(inode->i_mapping);
 723                         if (rc) {
 724                                 mapping_set_error(inode->i_mapping, rc);
 725                                 return rc;
 726                         }
 727                 }
 728                 /*
 729                  * Some applications poll for the file length in this strange
 730                  * way so we must seek to end on non-oplocked files by
 731                  * setting the revalidate time to zero.
 732                  */
 733                 CIFS_I(inode)->time = 0;
 734
 735                 rc = cifs_revalidate_file_attr(file);
 736                 if (rc < 0)
 737                         return (loff_t)rc;
 738         }
 739         return generic_file_llseek(file, offset, origin);
 740 }
 741
 742 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 743 {
 744         /* note that this is called by vfs setlease with lock_flocks held
 745            to protect *lease from going away */
 746         struct inode *inode = file->f_path.dentry->d_inode;
 747         struct cifsFileInfo *cfile = file->private_data;
 748
 749         if (!(S_ISREG(inode->i_mode)))
 750                 return -EINVAL;
 751
 752         /* check if file is oplocked */
 753         if (((arg == F_RDLCK) &&
 754                 (CIFS_I(inode)->clientCanCacheRead)) ||
 755             ((arg == F_WRLCK) &&
 756                 (CIFS_I(inode)->clientCanCacheAll)))
 757                 return generic_setlease(file, arg, lease);
 758         else if (tlink_tcon(cfile->tlink)->local_lease &&
 759                  !CIFS_I(inode)->clientCanCacheRead)
 760                 /* If the server claims to support oplock on this
 761                    file, then we still need to check oplock even
 762                    if the local_lease mount option is set, but there
 763                    are servers which do not support oplock for which
 764                    this mount option may be useful if the user
 765                    knows that the file won't be changed on the server
 766                    by anyone else */
 767                 return generic_setlease(file, arg, lease);
 768         else
 769                 return -EAGAIN;
 770 }
 771
 772 struct file_system_type cifs_fs_type = {
 773         .owner = THIS_MODULE,
 774         .name = "cifs",
 775         .mount = cifs_do_mount,
 776         .kill_sb = cifs_kill_sb,
 777         /*  .fs_flags */
 778 };
 779 const struct inode_operations cifs_dir_inode_ops = {
 780         .create = cifs_create,
 781         .lookup = cifs_lookup,
 782         .getattr = cifs_getattr,
 783         .unlink = cifs_unlink,
 784         .link = cifs_hardlink,
 785         .mkdir = cifs_mkdir,
 786         .rmdir = cifs_rmdir,
 787         .rename = cifs_rename,
 788         .permission = cifs_permission,
 789 /*      revalidate:cifs_revalidate,   */
 790         .setattr = cifs_setattr,
 791         .symlink = cifs_symlink,
 792         .mknod   = cifs_mknod,
 793 #ifdef CONFIG_CIFS_XATTR
 794         .setxattr = cifs_setxattr,
 795         .getxattr = cifs_getxattr,
 796         .listxattr = cifs_listxattr,
 797         .removexattr = cifs_removexattr,
 798 #endif
 799 };
 800
 801 const struct inode_operations cifs_file_inode_ops = {
 802 /*      revalidate:cifs_revalidate, */
 803         .setattr = cifs_setattr,
 804         .getattr = cifs_getattr, /* do we need this anymore? */
 805         .rename = cifs_rename,
 806         .permission = cifs_permission,
 807 #ifdef CONFIG_CIFS_XATTR
 808         .setxattr = cifs_setxattr,
 809         .getxattr = cifs_getxattr,
 810         .listxattr = cifs_listxattr,
 811         .removexattr = cifs_removexattr,
 812 #endif
 813 };
 814
 815 const struct inode_operations cifs_symlink_inode_ops = {
 816         .readlink = generic_readlink,
 817         .follow_link = cifs_follow_link,
 818         .put_link = cifs_put_link,
 819         .permission = cifs_permission,
 820         /* BB add the following two eventually */
 821         /* revalidate: cifs_revalidate,
 822            setattr:    cifs_notify_change, *//* BB do we need notify change */
 823 #ifdef CONFIG_CIFS_XATTR
 824         .setxattr = cifs_setxattr,
 825         .getxattr = cifs_getxattr,
 826         .listxattr = cifs_listxattr,
 827         .removexattr = cifs_removexattr,
 828 #endif
 829 };
 830
 831 const struct file_operations cifs_file_ops = {
 832         .read = do_sync_read,
 833         .write = do_sync_write,
 834         .aio_read = generic_file_aio_read,
 835         .aio_write = cifs_file_aio_write,
 836         .open = cifs_open,
 837         .release = cifs_close,
 838         .lock = cifs_lock,
 839         .fsync = cifs_fsync,
 840         .flush = cifs_flush,
 841         .mmap  = cifs_file_mmap,
 842         .splice_read = generic_file_splice_read,
 843         .llseek = cifs_llseek,
 844 #ifdef CONFIG_CIFS_POSIX
 845         .unlocked_ioctl = cifs_ioctl,
 846 #endif /* CONFIG_CIFS_POSIX */
 847         .setlease = cifs_setlease,
 848 };
 849
 850 const struct file_operations cifs_file_strict_ops = {
 851         .read = do_sync_read,
 852         .write = do_sync_write,
 853         .aio_read = cifs_strict_readv,
 854         .aio_write = cifs_strict_writev,
 855         .open = cifs_open,
 856         .release = cifs_close,
 857         .lock = cifs_lock,
 858         .fsync = cifs_strict_fsync,
 859         .flush = cifs_flush,
 860         .mmap = cifs_file_strict_mmap,
 861         .splice_read = generic_file_splice_read,
 862         .llseek = cifs_llseek,
 863 #ifdef CONFIG_CIFS_POSIX
 864         .unlocked_ioctl = cifs_ioctl,
 865 #endif /* CONFIG_CIFS_POSIX */
 866         .setlease = cifs_setlease,
 867 };
 868
 869 const struct file_operations cifs_file_direct_ops = {
 870         /* BB reevaluate whether they can be done with directio, no cache */
 871         .read = do_sync_read,
 872         .write = do_sync_write,
 873         .aio_read = cifs_user_readv,
 874         .aio_write = cifs_user_writev,
 875         .open = cifs_open,
 876         .release = cifs_close,
 877         .lock = cifs_lock,
 878         .fsync = cifs_fsync,
 879         .flush = cifs_flush,
 880         .mmap = cifs_file_mmap,
 881         .splice_read = generic_file_splice_read,
 882 #ifdef CONFIG_CIFS_POSIX
 883         .unlocked_ioctl  = cifs_ioctl,
 884 #endif /* CONFIG_CIFS_POSIX */
 885         .llseek = cifs_llseek,
 886         .setlease = cifs_setlease,
 887 };
 888
 889 const struct file_operations cifs_file_nobrl_ops = {
 890         .read = do_sync_read,
 891         .write = do_sync_write,
 892         .aio_read = generic_file_aio_read,
 893         .aio_write = cifs_file_aio_write,
 894         .open = cifs_open,
 895         .release = cifs_close,
 896         .fsync = cifs_fsync,
 897         .flush = cifs_flush,
 898         .mmap  = cifs_file_mmap,
 899         .splice_read = generic_file_splice_read,
 900         .llseek = cifs_llseek,
 901 #ifdef CONFIG_CIFS_POSIX
 902         .unlocked_ioctl = cifs_ioctl,
 903 #endif /* CONFIG_CIFS_POSIX */
 904         .setlease = cifs_setlease,
 905 };
 906
 907 const struct file_operations cifs_file_strict_nobrl_ops = {
 908         .read = do_sync_read,
 909         .write = do_sync_write,
 910         .aio_read = cifs_strict_readv,
 911         .aio_write = cifs_strict_writev,
 912         .open = cifs_open,
 913         .release = cifs_close,
 914         .fsync = cifs_strict_fsync,
 915         .flush = cifs_flush,
 916         .mmap = cifs_file_strict_mmap,
 917         .splice_read = generic_file_splice_read,
 918         .llseek = cifs_llseek,
 919 #ifdef CONFIG_CIFS_POSIX
 920         .unlocked_ioctl = cifs_ioctl,
 921 #endif /* CONFIG_CIFS_POSIX */
 922         .setlease = cifs_setlease,
 923 };
 924
 925 const struct file_operations cifs_file_direct_nobrl_ops = {
 926         /* BB reevaluate whether they can be done with directio, no cache */
 927         .read = do_sync_read,
 928         .write = do_sync_write,
 929         .aio_read = cifs_user_readv,
 930         .aio_write = cifs_user_writev,
 931         .open = cifs_open,
 932         .release = cifs_close,
 933         .fsync = cifs_fsync,
 934         .flush = cifs_flush,
 935         .mmap = cifs_file_mmap,
 936         .splice_read = generic_file_splice_read,
 937 #ifdef CONFIG_CIFS_POSIX
 938         .unlocked_ioctl  = cifs_ioctl,
 939 #endif /* CONFIG_CIFS_POSIX */
 940         .llseek = cifs_llseek,
 941         .setlease = cifs_setlease,
 942 };
 943
 944 const struct file_operations cifs_dir_ops = {
 945         .readdir = cifs_readdir,
 946         .release = cifs_closedir,
 947         .read    = generic_read_dir,
 948         .unlocked_ioctl  = cifs_ioctl,
 949         .llseek = generic_file_llseek,
 950 };
 951
 952 static void
 953 cifs_init_once(void *inode)
 954 {
 955         struct cifsInodeInfo *cifsi = inode;
 956
 957         inode_init_once(&cifsi->vfs_inode);
 958         mutex_init(&cifsi->lock_mutex);
 959 }
 960
 961 static int
 962 cifs_init_inodecache(void)
 963 {
 964         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 965                                               sizeof(struct cifsInodeInfo),
 966                                               0, (SLAB_RECLAIM_ACCOUNT|
 967                                                 SLAB_MEM_SPREAD),
 968                                               cifs_init_once);
 969         if (cifs_inode_cachep == NULL)
 970                 return -ENOMEM;
 971
 972         return 0;
 973 }
 974
 975 static void
 976 cifs_destroy_inodecache(void)
 977 {
 978         kmem_cache_destroy(cifs_inode_cachep);
 979 }
 980
 981 static int
 982 cifs_init_request_bufs(void)
 983 {
 984         if (CIFSMaxBufSize < 8192) {
 985         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 986         Unicode path name has to fit in any SMB/CIFS path based frames */
 987                 CIFSMaxBufSize = 8192;
 988         } else if (CIFSMaxBufSize > 1024*127) {
 989                 CIFSMaxBufSize = 1024 * 127;
 990         } else {
 991                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 992         }
 993 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 994         cifs_req_cachep = kmem_cache_create("cifs_request",
 995                                             CIFSMaxBufSize +
 996                                             MAX_CIFS_HDR_SIZE, 0,
 997                                             SLAB_HWCACHE_ALIGN, NULL);
 998         if (cifs_req_cachep == NULL)
 999                 return -ENOMEM;
1000
1001         if (cifs_min_rcv < 1)
1002                 cifs_min_rcv = 1;
1003         else if (cifs_min_rcv > 64) {
1004                 cifs_min_rcv = 64;
1005                 cERROR(1, "cifs_min_rcv set to maximum (64)");
1006         }
1007
1008         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1009                                                   cifs_req_cachep);
1010
1011         if (cifs_req_poolp == NULL) {
1012                 kmem_cache_destroy(cifs_req_cachep);
1013                 return -ENOMEM;
1014         }
1015         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1016         almost all handle based requests (but not write response, nor is it
1017         sufficient for path based requests).  A smaller size would have
1018         been more efficient (compacting multiple slab items on one 4k page)
1019         for the case in which debug was on, but this larger size allows
1020         more SMBs to use small buffer alloc and is still much more
1021         efficient to alloc 1 per page off the slab compared to 17K (5page)
1022         alloc of large cifs buffers even when page debugging is on */
1023         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1024                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1025                         NULL);
1026         if (cifs_sm_req_cachep == NULL) {
1027                 mempool_destroy(cifs_req_poolp);
1028                 kmem_cache_destroy(cifs_req_cachep);
1029                 return -ENOMEM;
1030         }
1031
1032         if (cifs_min_small < 2)
1033                 cifs_min_small = 2;
1034         else if (cifs_min_small > 256) {
1035                 cifs_min_small = 256;
1036                 cFYI(1, "cifs_min_small set to maximum (256)");
1037         }
1038
1039         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1040                                                      cifs_sm_req_cachep);
1041
1042         if (cifs_sm_req_poolp == NULL) {
1043                 mempool_destroy(cifs_req_poolp);
1044                 kmem_cache_destroy(cifs_req_cachep);
1045                 kmem_cache_destroy(cifs_sm_req_cachep);
1046                 return -ENOMEM;
1047         }
1048
1049         return 0;
1050 }
1051
1052 static void
1053 cifs_destroy_request_bufs(void)
1054 {
1055         mempool_destroy(cifs_req_poolp);
1056         kmem_cache_destroy(cifs_req_cachep);
1057         mempool_destroy(cifs_sm_req_poolp);
1058         kmem_cache_destroy(cifs_sm_req_cachep);
1059 }
1060
1061 static int
1062 cifs_init_mids(void)
1063 {
1064         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1065                                             sizeof(struct mid_q_entry), 0,
1066                                             SLAB_HWCACHE_ALIGN, NULL);
1067         if (cifs_mid_cachep == NULL)
1068                 return -ENOMEM;
1069
1070         /* 3 is a reasonable minimum number of simultaneous operations */
1071         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1072         if (cifs_mid_poolp == NULL) {
1073                 kmem_cache_destroy(cifs_mid_cachep);
1074                 return -ENOMEM;
1075         }
1076
1077         return 0;
1078 }
1079
1080 static void
1081 cifs_destroy_mids(void)
1082 {
1083         mempool_destroy(cifs_mid_poolp);
1084         kmem_cache_destroy(cifs_mid_cachep);
1085 }
1086
1087 static int __init
1088 init_cifs(void)
1089 {
1090         int rc = 0;
1091         cifs_proc_init();
1092         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1093 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1094         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1095         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1096 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1097 /*
1098  *  Initialize Global counters
1099  */
1100         atomic_set(&sesInfoAllocCount, 0);
1101         atomic_set(&tconInfoAllocCount, 0);
1102         atomic_set(&tcpSesAllocCount, 0);
1103         atomic_set(&tcpSesReconnectCount, 0);
1104         atomic_set(&tconInfoReconnectCount, 0);
1105
1106         atomic_set(&bufAllocCount, 0);
1107         atomic_set(&smBufAllocCount, 0);
1108 #ifdef CONFIG_CIFS_STATS2
1109         atomic_set(&totBufAllocCount, 0);
1110         atomic_set(&totSmBufAllocCount, 0);
1111 #endif /* CONFIG_CIFS_STATS2 */
1112
1113         atomic_set(&midCount, 0);
1114         GlobalCurrentXid = 0;
1115         GlobalTotalActiveXid = 0;
1116         GlobalMaxActiveXid = 0;
1117         spin_lock_init(&cifs_tcp_ses_lock);
1118         spin_lock_init(&cifs_file_list_lock);
1119         spin_lock_init(&GlobalMid_Lock);
1120
1121         if (cifs_max_pending < 2) {
1122                 cifs_max_pending = 2;
1123                 cFYI(1, "cifs_max_pending set to min of 2");
1124         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1125                 cifs_max_pending = CIFS_MAX_REQ;
1126                 cFYI(1, "cifs_max_pending set to max of %u", CIFS_MAX_REQ);
1127         }
1128
1129         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1130         if (!cifsiod_wq) {
1131                 rc = -ENOMEM;
1132                 goto out_clean_proc;
1133         }
1134
1135         rc = cifs_fscache_register();
1136         if (rc)
1137                 goto out_destroy_wq;
1138
1139         rc = cifs_init_inodecache();
1140         if (rc)
1141                 goto out_unreg_fscache;
1142
1143         rc = cifs_init_mids();
1144         if (rc)
1145                 goto out_destroy_inodecache;
1146
1147         rc = cifs_init_request_bufs();
1148         if (rc)
1149                 goto out_destroy_mids;
1150
1151 #ifdef CONFIG_CIFS_UPCALL
1152         rc = register_key_type(&cifs_spnego_key_type);
1153         if (rc)
1154                 goto out_destroy_request_bufs;
1155 #endif /* CONFIG_CIFS_UPCALL */
1156
1157 #ifdef CONFIG_CIFS_ACL
1158         rc = init_cifs_idmap();
1159         if (rc)
1160                 goto out_register_key_type;
1161 #endif /* CONFIG_CIFS_ACL */
1162
1163         rc = register_filesystem(&cifs_fs_type);
1164         if (rc)
1165                 goto out_init_cifs_idmap;
1166
1167         return 0;
1168
1169 out_init_cifs_idmap:
1170 #ifdef CONFIG_CIFS_ACL
1171         exit_cifs_idmap();
1172 out_register_key_type:
1173 #endif
1174 #ifdef CONFIG_CIFS_UPCALL
1175         unregister_key_type(&cifs_spnego_key_type);
1176 out_destroy_request_bufs:
1177 #endif
1178         cifs_destroy_request_bufs();
1179 out_destroy_mids:
1180         cifs_destroy_mids();
1181 out_destroy_inodecache:
1182         cifs_destroy_inodecache();
1183 out_unreg_fscache:
1184         cifs_fscache_unregister();
1185 out_destroy_wq:
1186         destroy_workqueue(cifsiod_wq);
1187 out_clean_proc:
1188         cifs_proc_clean();
1189         return rc;
1190 }
1191
1192 static void __exit
1193 exit_cifs(void)
1194 {
1195         cFYI(DBG2, "exit_cifs");
1196         unregister_filesystem(&cifs_fs_type);
1197         cifs_dfs_release_automount_timer();
1198 #ifdef CONFIG_CIFS_ACL
1199         cifs_destroy_idmaptrees();
1200         exit_cifs_idmap();
1201 #endif
1202 #ifdef CONFIG_CIFS_UPCALL
1203         unregister_key_type(&cifs_spnego_key_type);
1204 #endif
1205         cifs_destroy_request_bufs();
1206         cifs_destroy_mids();
1207         cifs_destroy_inodecache();
1208         cifs_fscache_unregister();
1209         destroy_workqueue(cifsiod_wq);
1210         cifs_proc_clean();
1211 }
1212
1213 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1214 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1215 MODULE_DESCRIPTION
1216     ("VFS to access servers complying with the SNIA CIFS Specification "
1217      "e.g. Samba and Windows");
1218 MODULE_VERSION(CIFS_VERSION);
1219 module_init(init_cifs)
1220 module_exit(exit_cifs)