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         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 261 }
 262
 263 static void
 264 cifs_destroy_inode(struct inode *inode)
 265 {
 266         call_rcu(&inode->i_rcu, cifs_i_callback);
 267 }
 268
 269 static void
 270 cifs_evict_inode(struct inode *inode)
 271 {
 272         truncate_inode_pages(&inode->i_data, 0);
 273         clear_inode(inode);
 274         cifs_fscache_release_inode_cookie(inode);
 275 }
 276
 277 static void
 278 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 279 {
 280         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 281         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 282
 283         seq_printf(s, ",addr=");
 284
 285         switch (server->dstaddr.ss_family) {
 286         case AF_INET:
 287                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 288                 break;
 289         case AF_INET6:
 290                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 291                 if (sa6->sin6_scope_id)
 292                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 293                 break;
 294         default:
 295                 seq_printf(s, "(unknown)");
 296         }
 297 }
 298
 299 static void
 300 cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server)
 301 {
 302         seq_printf(s, ",sec=");
 303
 304         switch (server->secType) {
 305         case LANMAN:
 306                 seq_printf(s, "lanman");
 307                 break;
 308         case NTLMv2:
 309                 seq_printf(s, "ntlmv2");
 310                 break;
 311         case NTLM:
 312                 seq_printf(s, "ntlm");
 313                 break;
 314         case Kerberos:
 315                 seq_printf(s, "krb5");
 316                 break;
 317         case RawNTLMSSP:
 318                 seq_printf(s, "ntlmssp");
 319                 break;
 320         default:
 321                 /* shouldn't ever happen */
 322                 seq_printf(s, "unknown");
 323                 break;
 324         }
 325
 326         if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
 327                 seq_printf(s, "i");
 328 }
 329
 330 static void
 331 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
 332 {
 333         seq_printf(s, ",cache=");
 334
 335         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
 336                 seq_printf(s, "strict");
 337         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 338                 seq_printf(s, "none");
 339         else
 340                 seq_printf(s, "loose");
 341 }
 342
 343 /*
 344  * cifs_show_options() is for displaying mount options in /proc/mounts.
 345  * Not all settable options are displayed but most of the important
 346  * ones are.
 347  */
 348 static int
 349 cifs_show_options(struct seq_file *s, struct dentry *root)
 350 {
 351         struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
 352         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 353         struct sockaddr *srcaddr;
 354         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 355
 356         seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
 357         cifs_show_security(s, tcon->ses->server);
 358         cifs_show_cache_flavor(s, cifs_sb);
 359
 360         seq_printf(s, ",unc=%s", tcon->treeName);
 361
 362         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 363                 seq_printf(s, ",multiuser");
 364         else if (tcon->ses->user_name)
 365                 seq_printf(s, ",username=%s", tcon->ses->user_name);
 366
 367         if (tcon->ses->domainName)
 368                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 369
 370         if (srcaddr->sa_family != AF_UNSPEC) {
 371                 struct sockaddr_in *saddr4;
 372                 struct sockaddr_in6 *saddr6;
 373                 saddr4 = (struct sockaddr_in *)srcaddr;
 374                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 375                 if (srcaddr->sa_family == AF_INET6)
 376                         seq_printf(s, ",srcaddr=%pI6c",
 377                                    &saddr6->sin6_addr);
 378                 else if (srcaddr->sa_family == AF_INET)
 379                         seq_printf(s, ",srcaddr=%pI4",
 380                                    &saddr4->sin_addr.s_addr);
 381                 else
 382                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 383                                    (int)(srcaddr->sa_family));
 384         }
 385
 386         seq_printf(s, ",uid=%u", cifs_sb->mnt_uid);
 387         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 388                 seq_printf(s, ",forceuid");
 389         else
 390                 seq_printf(s, ",noforceuid");
 391
 392         seq_printf(s, ",gid=%u", cifs_sb->mnt_gid);
 393         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 394                 seq_printf(s, ",forcegid");
 395         else
 396                 seq_printf(s, ",noforcegid");
 397
 398         cifs_show_address(s, tcon->ses->server);
 399
 400         if (!tcon->unix_ext)
 401                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 402                                            cifs_sb->mnt_file_mode,
 403                                            cifs_sb->mnt_dir_mode);
 404         if (tcon->seal)
 405                 seq_printf(s, ",seal");
 406         if (tcon->nocase)
 407                 seq_printf(s, ",nocase");
 408         if (tcon->retry)
 409                 seq_printf(s, ",hard");
 410         if (tcon->unix_ext)
 411                 seq_printf(s, ",unix");
 412         else
 413                 seq_printf(s, ",nounix");
 414         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 415                 seq_printf(s, ",posixpaths");
 416         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 417                 seq_printf(s, ",setuids");
 418         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 419                 seq_printf(s, ",serverino");
 420         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 421                 seq_printf(s, ",rwpidforward");
 422         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 423                 seq_printf(s, ",forcemand");
 424         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 425                 seq_printf(s, ",nouser_xattr");
 426         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 427                 seq_printf(s, ",mapchars");
 428         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 429                 seq_printf(s, ",sfu");
 430         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 431                 seq_printf(s, ",nobrl");
 432         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 433                 seq_printf(s, ",cifsacl");
 434         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 435                 seq_printf(s, ",dynperm");
 436         if (root->d_sb->s_flags & MS_POSIXACL)
 437                 seq_printf(s, ",acl");
 438         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 439                 seq_printf(s, ",mfsymlinks");
 440         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 441                 seq_printf(s, ",fsc");
 442         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 443                 seq_printf(s, ",nostrictsync");
 444         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 445                 seq_printf(s, ",noperm");
 446         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 447                 seq_printf(s, ",backupuid=%u", cifs_sb->mnt_backupuid);
 448         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 449                 seq_printf(s, ",backupgid=%u", cifs_sb->mnt_backupgid);
 450
 451         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 452         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 453         /* convert actimeo and display it in seconds */
 454         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 455
 456         return 0;
 457 }
 458
 459 static void cifs_umount_begin(struct super_block *sb)
 460 {
 461         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 462         struct cifs_tcon *tcon;
 463
 464         if (cifs_sb == NULL)
 465                 return;
 466
 467         tcon = cifs_sb_master_tcon(cifs_sb);
 468
 469         spin_lock(&cifs_tcp_ses_lock);
 470         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 471                 /* we have other mounts to same share or we have
 472                    already tried to force umount this and woken up
 473                    all waiting network requests, nothing to do */
 474                 spin_unlock(&cifs_tcp_ses_lock);
 475                 return;
 476         } else if (tcon->tc_count == 1)
 477                 tcon->tidStatus = CifsExiting;
 478         spin_unlock(&cifs_tcp_ses_lock);
 479
 480         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 481         /* cancel_notify_requests(tcon); */
 482         if (tcon->ses && tcon->ses->server) {
 483                 cFYI(1, "wake up tasks now - umount begin not complete");
 484                 wake_up_all(&tcon->ses->server->request_q);
 485                 wake_up_all(&tcon->ses->server->response_q);
 486                 msleep(1); /* yield */
 487                 /* we have to kick the requests once more */
 488                 wake_up_all(&tcon->ses->server->response_q);
 489                 msleep(1);
 490         }
 491
 492         return;
 493 }
 494
 495 #ifdef CONFIG_CIFS_STATS2
 496 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 497 {
 498         /* BB FIXME */
 499         return 0;
 500 }
 501 #endif
 502
 503 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 504 {
 505         *flags |= MS_NODIRATIME;
 506         return 0;
 507 }
 508
 509 static int cifs_drop_inode(struct inode *inode)
 510 {
 511         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 512
 513         /* no serverino => unconditional eviction */
 514         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 515                 generic_drop_inode(inode);
 516 }
 517
 518 static const struct super_operations cifs_super_ops = {
 519         .statfs = cifs_statfs,
 520         .alloc_inode = cifs_alloc_inode,
 521         .destroy_inode = cifs_destroy_inode,
 522         .drop_inode     = cifs_drop_inode,
 523         .evict_inode    = cifs_evict_inode,
 524 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 525         function unless later we add lazy close of inodes or unless the
 526         kernel forgets to call us with the same number of releases (closes)
 527         as opens */
 528         .show_options = cifs_show_options,
 529         .umount_begin   = cifs_umount_begin,
 530         .remount_fs = cifs_remount,
 531 #ifdef CONFIG_CIFS_STATS2
 532         .show_stats = cifs_show_stats,
 533 #endif
 534 };
 535
 536 /*
 537  * Get root dentry from superblock according to prefix path mount option.
 538  * Return dentry with refcount + 1 on success and NULL otherwise.
 539  */
 540 static struct dentry *
 541 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 542 {
 543         struct dentry *dentry;
 544         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 545         char *full_path = NULL;
 546         char *s, *p;
 547         char sep;
 548
 549         full_path = cifs_build_path_to_root(vol, cifs_sb,
 550                                             cifs_sb_master_tcon(cifs_sb));
 551         if (full_path == NULL)
 552                 return ERR_PTR(-ENOMEM);
 553
 554         cFYI(1, "Get root dentry for %s", full_path);
 555
 556         sep = CIFS_DIR_SEP(cifs_sb);
 557         dentry = dget(sb->s_root);
 558         p = s = full_path;
 559
 560         do {
 561                 struct inode *dir = dentry->d_inode;
 562                 struct dentry *child;
 563
 564                 if (!dir) {
 565                         dput(dentry);
 566                         dentry = ERR_PTR(-ENOENT);
 567                         break;
 568                 }
 569
 570                 /* skip separators */
 571                 while (*s == sep)
 572                         s++;
 573                 if (!*s)
 574                         break;
 575                 p = s++;
 576                 /* next separator */
 577                 while (*s && *s != sep)
 578                         s++;
 579
 580                 mutex_lock(&dir->i_mutex);
 581                 child = lookup_one_len(p, dentry, s - p);
 582                 mutex_unlock(&dir->i_mutex);
 583                 dput(dentry);
 584                 dentry = child;
 585         } while (!IS_ERR(dentry));
 586         kfree(full_path);
 587         return dentry;
 588 }
 589
 590 static int cifs_set_super(struct super_block *sb, void *data)
 591 {
 592         struct cifs_mnt_data *mnt_data = data;
 593         sb->s_fs_info = mnt_data->cifs_sb;
 594         return set_anon_super(sb, NULL);
 595 }
 596
 597 static struct dentry *
 598 cifs_do_mount(struct file_system_type *fs_type,
 599               int flags, const char *dev_name, void *data)
 600 {
 601         int rc;
 602         struct super_block *sb;
 603         struct cifs_sb_info *cifs_sb;
 604         struct smb_vol *volume_info;
 605         struct cifs_mnt_data mnt_data;
 606         struct dentry *root;
 607
 608         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 609
 610         volume_info = cifs_get_volume_info((char *)data, dev_name);
 611         if (IS_ERR(volume_info))
 612                 return ERR_CAST(volume_info);
 613
 614         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 615         if (cifs_sb == NULL) {
 616                 root = ERR_PTR(-ENOMEM);
 617                 goto out_nls;
 618         }
 619
 620         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 621         if (cifs_sb->mountdata == NULL) {
 622                 root = ERR_PTR(-ENOMEM);
 623                 goto out_cifs_sb;
 624         }
 625
 626         cifs_setup_cifs_sb(volume_info, cifs_sb);
 627
 628         rc = cifs_mount(cifs_sb, volume_info);
 629         if (rc) {
 630                 if (!(flags & MS_SILENT))
 631                         cERROR(1, "cifs_mount failed w/return code = %d", rc);
 632                 root = ERR_PTR(rc);
 633                 goto out_mountdata;
 634         }
 635
 636         mnt_data.vol = volume_info;
 637         mnt_data.cifs_sb = cifs_sb;
 638         mnt_data.flags = flags;
 639
 640         sb = sget(fs_type, cifs_match_super, cifs_set_super, &mnt_data);
 641         if (IS_ERR(sb)) {
 642                 root = ERR_CAST(sb);
 643                 cifs_umount(cifs_sb);
 644                 goto out;
 645         }
 646
 647         if (sb->s_root) {
 648                 cFYI(1, "Use existing superblock");
 649                 cifs_umount(cifs_sb);
 650         } else {
 651                 sb->s_flags = flags;
 652                 /* BB should we make this contingent on mount parm? */
 653                 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 654
 655                 rc = cifs_read_super(sb);
 656                 if (rc) {
 657                         root = ERR_PTR(rc);
 658                         goto out_super;
 659                 }
 660
 661                 sb->s_flags |= MS_ACTIVE;
 662         }
 663
 664         root = cifs_get_root(volume_info, sb);
 665         if (IS_ERR(root))
 666                 goto out_super;
 667
 668         cFYI(1, "dentry root is: %p", root);
 669         goto out;
 670
 671 out_super:
 672         deactivate_locked_super(sb);
 673 out:
 674         cifs_cleanup_volume_info(volume_info);
 675         return root;
 676
 677 out_mountdata:
 678         kfree(cifs_sb->mountdata);
 679 out_cifs_sb:
 680         kfree(cifs_sb);
 681 out_nls:
 682         unload_nls(volume_info->local_nls);
 683         goto out;
 684 }
 685
 686 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 687                                    unsigned long nr_segs, loff_t pos)
 688 {
 689         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 690         ssize_t written;
 691         int rc;
 692
 693         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 694
 695         if (CIFS_I(inode)->clientCanCacheAll)
 696                 return written;
 697
 698         rc = filemap_fdatawrite(inode->i_mapping);
 699         if (rc)
 700                 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
 701
 702         return written;
 703 }
 704
 705 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 706 {
 707         /*
 708          * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 709          * the cached file length
 710          */
 711         if (origin != SEEK_SET && origin != SEEK_CUR) {
 712                 int rc;
 713                 struct inode *inode = file->f_path.dentry->d_inode;
 714
 715                 /*
 716                  * We need to be sure that all dirty pages are written and the
 717                  * server has the newest file length.
 718                  */
 719                 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
 720                     inode->i_mapping->nrpages != 0) {
 721                         rc = filemap_fdatawait(inode->i_mapping);
 722                         if (rc) {
 723                                 mapping_set_error(inode->i_mapping, rc);
 724                                 return rc;
 725                         }
 726                 }
 727                 /*
 728                  * Some applications poll for the file length in this strange
 729                  * way so we must seek to end on non-oplocked files by
 730                  * setting the revalidate time to zero.
 731                  */
 732                 CIFS_I(inode)->time = 0;
 733
 734                 rc = cifs_revalidate_file_attr(file);
 735                 if (rc < 0)
 736                         return (loff_t)rc;
 737         }
 738         return generic_file_llseek(file, offset, origin);
 739 }
 740
 741 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 742 {
 743         /* note that this is called by vfs setlease with lock_flocks held
 744            to protect *lease from going away */
 745         struct inode *inode = file->f_path.dentry->d_inode;
 746         struct cifsFileInfo *cfile = file->private_data;
 747
 748         if (!(S_ISREG(inode->i_mode)))
 749                 return -EINVAL;
 750
 751         /* check if file is oplocked */
 752         if (((arg == F_RDLCK) &&
 753                 (CIFS_I(inode)->clientCanCacheRead)) ||
 754             ((arg == F_WRLCK) &&
 755                 (CIFS_I(inode)->clientCanCacheAll)))
 756                 return generic_setlease(file, arg, lease);
 757         else if (tlink_tcon(cfile->tlink)->local_lease &&
 758                  !CIFS_I(inode)->clientCanCacheRead)
 759                 /* If the server claims to support oplock on this
 760                    file, then we still need to check oplock even
 761                    if the local_lease mount option is set, but there
 762                    are servers which do not support oplock for which
 763                    this mount option may be useful if the user
 764                    knows that the file won't be changed on the server
 765                    by anyone else */
 766                 return generic_setlease(file, arg, lease);
 767         else
 768                 return -EAGAIN;
 769 }
 770
 771 struct file_system_type cifs_fs_type = {
 772         .owner = THIS_MODULE,
 773         .name = "cifs",
 774         .mount = cifs_do_mount,
 775         .kill_sb = cifs_kill_sb,
 776         /*  .fs_flags */
 777 };
 778 const struct inode_operations cifs_dir_inode_ops = {
 779         .create = cifs_create,
 780         .atomic_open = cifs_atomic_open,
 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)