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 <linux/random.h>
  40 #include <net/ipv6.h>
  41 #include "cifsfs.h"
  42 #include "cifspdu.h"
  43 #define DECLARE_GLOBALS_HERE
  44 #include "cifsglob.h"
  45 #include "cifsproto.h"
  46 #include "cifs_debug.h"
  47 #include "cifs_fs_sb.h"
  48 #include <linux/mm.h>
  49 #include <linux/key-type.h>
  50 #include "cifs_spnego.h"
  51 #include "fscache.h"
  52 #ifdef CONFIG_CIFS_SMB2
  53 #include "smb2pdu.h"
  54 #endif
  55
  56 int cifsFYI = 0;
  57 int cifsERROR = 1;
  58 int traceSMB = 0;
  59 bool enable_oplocks = true;
  60 unsigned int linuxExtEnabled = 1;
  61 unsigned int lookupCacheEnabled = 1;
  62 unsigned int global_secflags = CIFSSEC_DEF;
  63 /* unsigned int ntlmv2_support = 0; */
  64 unsigned int sign_CIFS_PDUs = 1;
  65 static const struct super_operations cifs_super_ops;
  66 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  67 module_param(CIFSMaxBufSize, int, 0);
  68 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  69                                  "Default: 16384 Range: 8192 to 130048");
  70 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  71 module_param(cifs_min_rcv, int, 0);
  72 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  73                                 "1 to 64");
  74 unsigned int cifs_min_small = 30;
  75 module_param(cifs_min_small, int, 0);
  76 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  77                                  "Range: 2 to 256");
  78 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  79 module_param(cifs_max_pending, int, 0444);
  80 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  81                                    "Default: 32767 Range: 2 to 32767.");
  82 module_param(enable_oplocks, bool, 0644);
  83 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks (bool). Default:"
  84                                  "y/Y/1");
  85
  86 extern mempool_t *cifs_sm_req_poolp;
  87 extern mempool_t *cifs_req_poolp;
  88 extern mempool_t *cifs_mid_poolp;
  89
  90 struct workqueue_struct *cifsiod_wq;
  91
  92 #ifdef CONFIG_CIFS_SMB2
  93 __u8 cifs_client_guid[SMB2_CLIENT_GUID_SIZE];
  94 #endif
  95
  96 static int
  97 cifs_read_super(struct super_block *sb)
  98 {
  99         struct inode *inode;
 100         struct cifs_sb_info *cifs_sb;
 101         int rc = 0;
 102
 103         cifs_sb = CIFS_SB(sb);
 104
 105         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
 106                 sb->s_flags |= MS_POSIXACL;
 107
 108         if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES)
 109                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 110         else
 111                 sb->s_maxbytes = MAX_NON_LFS;
 112
 113         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
 114         sb->s_time_gran = 100;
 115
 116         sb->s_magic = CIFS_MAGIC_NUMBER;
 117         sb->s_op = &cifs_super_ops;
 118         sb->s_bdi = &cifs_sb->bdi;
 119         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 120         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 121         inode = cifs_root_iget(sb);
 122
 123         if (IS_ERR(inode)) {
 124                 rc = PTR_ERR(inode);
 125                 goto out_no_root;
 126         }
 127
 128         sb->s_root = d_make_root(inode);
 129         if (!sb->s_root) {
 130                 rc = -ENOMEM;
 131                 goto out_no_root;
 132         }
 133
 134         /* do that *after* d_make_root() - we want NULL ->d_op for root here */
 135         if (cifs_sb_master_tcon(cifs_sb)->nocase)
 136                 sb->s_d_op = &cifs_ci_dentry_ops;
 137         else
 138                 sb->s_d_op = &cifs_dentry_ops;
 139
 140 #ifdef CONFIG_CIFS_NFSD_EXPORT
 141         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 142                 cFYI(1, "export ops supported");
 143                 sb->s_export_op = &cifs_export_ops;
 144         }
 145 #endif /* CONFIG_CIFS_NFSD_EXPORT */
 146
 147         return 0;
 148
 149 out_no_root:
 150         cERROR(1, "cifs_read_super: get root inode failed");
 151         return rc;
 152 }
 153
 154 static void cifs_kill_sb(struct super_block *sb)
 155 {
 156         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 157         kill_anon_super(sb);
 158         cifs_umount(cifs_sb);
 159 }
 160
 161 static int
 162 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 163 {
 164         struct super_block *sb = dentry->d_sb;
 165         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 166         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 167         struct TCP_Server_Info *server = tcon->ses->server;
 168         unsigned int xid;
 169         int rc = 0;
 170
 171         xid = get_xid();
 172
 173         /*
 174          * PATH_MAX may be too long - it would presumably be total path,
 175          * but note that some servers (includinng Samba 3) have a shorter
 176          * maximum path.
 177          *
 178          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 179          */
 180         buf->f_namelen = PATH_MAX;
 181         buf->f_files = 0;       /* undefined */
 182         buf->f_ffree = 0;       /* unlimited */
 183
 184         if (server->ops->queryfs)
 185                 rc = server->ops->queryfs(xid, tcon, buf);
 186
 187         free_xid(xid);
 188         return 0;
 189 }
 190
 191 static int cifs_permission(struct inode *inode, int mask)
 192 {
 193         struct cifs_sb_info *cifs_sb;
 194
 195         cifs_sb = CIFS_SB(inode->i_sb);
 196
 197         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 198                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 199                         return -EACCES;
 200                 else
 201                         return 0;
 202         } else /* file mode might have been restricted at mount time
 203                 on the client (above and beyond ACL on servers) for
 204                 servers which do not support setting and viewing mode bits,
 205                 so allowing client to check permissions is useful */
 206                 return generic_permission(inode, mask);
 207 }
 208
 209 static struct kmem_cache *cifs_inode_cachep;
 210 static struct kmem_cache *cifs_req_cachep;
 211 static struct kmem_cache *cifs_mid_cachep;
 212 static struct kmem_cache *cifs_sm_req_cachep;
 213 mempool_t *cifs_sm_req_poolp;
 214 mempool_t *cifs_req_poolp;
 215 mempool_t *cifs_mid_poolp;
 216
 217 static struct inode *
 218 cifs_alloc_inode(struct super_block *sb)
 219 {
 220         struct cifsInodeInfo *cifs_inode;
 221         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 222         if (!cifs_inode)
 223                 return NULL;
 224         cifs_inode->cifsAttrs = 0x20;   /* default */
 225         cifs_inode->time = 0;
 226         /*
 227          * Until the file is open and we have gotten oplock info back from the
 228          * server, can not assume caching of file data or metadata.
 229          */
 230         cifs_set_oplock_level(cifs_inode, 0);
 231         cifs_inode->delete_pending = false;
 232         cifs_inode->invalid_mapping = false;
 233         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 234         cifs_inode->server_eof = 0;
 235         cifs_inode->uniqueid = 0;
 236         cifs_inode->createtime = 0;
 237 #ifdef CONFIG_CIFS_SMB2
 238         get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
 239 #endif
 240         /*
 241          * Can not set i_flags here - they get immediately overwritten to zero
 242          * by the VFS.
 243          */
 244         /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
 245         INIT_LIST_HEAD(&cifs_inode->openFileList);
 246         INIT_LIST_HEAD(&cifs_inode->llist);
 247         return &cifs_inode->vfs_inode;
 248 }
 249
 250 static void cifs_i_callback(struct rcu_head *head)
 251 {
 252         struct inode *inode = container_of(head, struct inode, i_rcu);
 253         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 254 }
 255
 256 static void
 257 cifs_destroy_inode(struct inode *inode)
 258 {
 259         call_rcu(&inode->i_rcu, cifs_i_callback);
 260 }
 261
 262 static void
 263 cifs_evict_inode(struct inode *inode)
 264 {
 265         truncate_inode_pages(&inode->i_data, 0);
 266         clear_inode(inode);
 267         cifs_fscache_release_inode_cookie(inode);
 268 }
 269
 270 static void
 271 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 272 {
 273         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 274         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 275
 276         seq_printf(s, ",addr=");
 277
 278         switch (server->dstaddr.ss_family) {
 279         case AF_INET:
 280                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 281                 break;
 282         case AF_INET6:
 283                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 284                 if (sa6->sin6_scope_id)
 285                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 286                 break;
 287         default:
 288                 seq_printf(s, "(unknown)");
 289         }
 290 }
 291
 292 static void
 293 cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server)
 294 {
 295         seq_printf(s, ",sec=");
 296
 297         switch (server->secType) {
 298         case LANMAN:
 299                 seq_printf(s, "lanman");
 300                 break;
 301         case NTLMv2:
 302                 seq_printf(s, "ntlmv2");
 303                 break;
 304         case NTLM:
 305                 seq_printf(s, "ntlm");
 306                 break;
 307         case Kerberos:
 308                 seq_printf(s, "krb5");
 309                 break;
 310         case RawNTLMSSP:
 311                 seq_printf(s, "ntlmssp");
 312                 break;
 313         default:
 314                 /* shouldn't ever happen */
 315                 seq_printf(s, "unknown");
 316                 break;
 317         }
 318
 319         if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
 320                 seq_printf(s, "i");
 321 }
 322
 323 static void
 324 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
 325 {
 326         seq_printf(s, ",cache=");
 327
 328         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
 329                 seq_printf(s, "strict");
 330         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 331                 seq_printf(s, "none");
 332         else
 333                 seq_printf(s, "loose");
 334 }
 335
 336 /*
 337  * cifs_show_options() is for displaying mount options in /proc/mounts.
 338  * Not all settable options are displayed but most of the important
 339  * ones are.
 340  */
 341 static int
 342 cifs_show_options(struct seq_file *s, struct dentry *root)
 343 {
 344         struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
 345         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 346         struct sockaddr *srcaddr;
 347         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 348
 349         seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
 350         cifs_show_security(s, tcon->ses->server);
 351         cifs_show_cache_flavor(s, cifs_sb);
 352
 353         seq_printf(s, ",unc=");
 354         seq_escape(s, tcon->treeName, " \t\n\\");
 355
 356         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 357                 seq_printf(s, ",multiuser");
 358         else if (tcon->ses->user_name)
 359                 seq_printf(s, ",username=%s", tcon->ses->user_name);
 360
 361         if (tcon->ses->domainName)
 362                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 363
 364         if (srcaddr->sa_family != AF_UNSPEC) {
 365                 struct sockaddr_in *saddr4;
 366                 struct sockaddr_in6 *saddr6;
 367                 saddr4 = (struct sockaddr_in *)srcaddr;
 368                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 369                 if (srcaddr->sa_family == AF_INET6)
 370                         seq_printf(s, ",srcaddr=%pI6c",
 371                                    &saddr6->sin6_addr);
 372                 else if (srcaddr->sa_family == AF_INET)
 373                         seq_printf(s, ",srcaddr=%pI4",
 374                                    &saddr4->sin_addr.s_addr);
 375                 else
 376                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 377                                    (int)(srcaddr->sa_family));
 378         }
 379
 380         seq_printf(s, ",uid=%u", cifs_sb->mnt_uid);
 381         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 382                 seq_printf(s, ",forceuid");
 383         else
 384                 seq_printf(s, ",noforceuid");
 385
 386         seq_printf(s, ",gid=%u", cifs_sb->mnt_gid);
 387         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 388                 seq_printf(s, ",forcegid");
 389         else
 390                 seq_printf(s, ",noforcegid");
 391
 392         cifs_show_address(s, tcon->ses->server);
 393
 394         if (!tcon->unix_ext)
 395                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 396                                            cifs_sb->mnt_file_mode,
 397                                            cifs_sb->mnt_dir_mode);
 398         if (tcon->seal)
 399                 seq_printf(s, ",seal");
 400         if (tcon->nocase)
 401                 seq_printf(s, ",nocase");
 402         if (tcon->retry)
 403                 seq_printf(s, ",hard");
 404         if (tcon->unix_ext)
 405                 seq_printf(s, ",unix");
 406         else
 407                 seq_printf(s, ",nounix");
 408         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 409                 seq_printf(s, ",posixpaths");
 410         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 411                 seq_printf(s, ",setuids");
 412         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 413                 seq_printf(s, ",serverino");
 414         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 415                 seq_printf(s, ",rwpidforward");
 416         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 417                 seq_printf(s, ",forcemand");
 418         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 419                 seq_printf(s, ",nouser_xattr");
 420         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 421                 seq_printf(s, ",mapchars");
 422         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 423                 seq_printf(s, ",sfu");
 424         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 425                 seq_printf(s, ",nobrl");
 426         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 427                 seq_printf(s, ",cifsacl");
 428         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 429                 seq_printf(s, ",dynperm");
 430         if (root->d_sb->s_flags & MS_POSIXACL)
 431                 seq_printf(s, ",acl");
 432         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 433                 seq_printf(s, ",mfsymlinks");
 434         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 435                 seq_printf(s, ",fsc");
 436         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 437                 seq_printf(s, ",nostrictsync");
 438         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 439                 seq_printf(s, ",noperm");
 440         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 441                 seq_printf(s, ",backupuid=%u", cifs_sb->mnt_backupuid);
 442         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 443                 seq_printf(s, ",backupgid=%u", cifs_sb->mnt_backupgid);
 444
 445         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 446         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 447         /* convert actimeo and display it in seconds */
 448         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 449
 450         return 0;
 451 }
 452
 453 static void cifs_umount_begin(struct super_block *sb)
 454 {
 455         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 456         struct cifs_tcon *tcon;
 457
 458         if (cifs_sb == NULL)
 459                 return;
 460
 461         tcon = cifs_sb_master_tcon(cifs_sb);
 462
 463         spin_lock(&cifs_tcp_ses_lock);
 464         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 465                 /* we have other mounts to same share or we have
 466                    already tried to force umount this and woken up
 467                    all waiting network requests, nothing to do */
 468                 spin_unlock(&cifs_tcp_ses_lock);
 469                 return;
 470         } else if (tcon->tc_count == 1)
 471                 tcon->tidStatus = CifsExiting;
 472         spin_unlock(&cifs_tcp_ses_lock);
 473
 474         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 475         /* cancel_notify_requests(tcon); */
 476         if (tcon->ses && tcon->ses->server) {
 477                 cFYI(1, "wake up tasks now - umount begin not complete");
 478                 wake_up_all(&tcon->ses->server->request_q);
 479                 wake_up_all(&tcon->ses->server->response_q);
 480                 msleep(1); /* yield */
 481                 /* we have to kick the requests once more */
 482                 wake_up_all(&tcon->ses->server->response_q);
 483                 msleep(1);
 484         }
 485
 486         return;
 487 }
 488
 489 #ifdef CONFIG_CIFS_STATS2
 490 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 491 {
 492         /* BB FIXME */
 493         return 0;
 494 }
 495 #endif
 496
 497 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 498 {
 499         *flags |= MS_NODIRATIME;
 500         return 0;
 501 }
 502
 503 static int cifs_drop_inode(struct inode *inode)
 504 {
 505         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 506
 507         /* no serverino => unconditional eviction */
 508         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 509                 generic_drop_inode(inode);
 510 }
 511
 512 static const struct super_operations cifs_super_ops = {
 513         .statfs = cifs_statfs,
 514         .alloc_inode = cifs_alloc_inode,
 515         .destroy_inode = cifs_destroy_inode,
 516         .drop_inode     = cifs_drop_inode,
 517         .evict_inode    = cifs_evict_inode,
 518 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 519         function unless later we add lazy close of inodes or unless the
 520         kernel forgets to call us with the same number of releases (closes)
 521         as opens */
 522         .show_options = cifs_show_options,
 523         .umount_begin   = cifs_umount_begin,
 524         .remount_fs = cifs_remount,
 525 #ifdef CONFIG_CIFS_STATS2
 526         .show_stats = cifs_show_stats,
 527 #endif
 528 };
 529
 530 /*
 531  * Get root dentry from superblock according to prefix path mount option.
 532  * Return dentry with refcount + 1 on success and NULL otherwise.
 533  */
 534 static struct dentry *
 535 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 536 {
 537         struct dentry *dentry;
 538         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 539         char *full_path = NULL;
 540         char *s, *p;
 541         char sep;
 542
 543         full_path = build_path_to_root(vol, cifs_sb,
 544                                        cifs_sb_master_tcon(cifs_sb));
 545         if (full_path == NULL)
 546                 return ERR_PTR(-ENOMEM);
 547
 548         cFYI(1, "Get root dentry for %s", full_path);
 549
 550         sep = CIFS_DIR_SEP(cifs_sb);
 551         dentry = dget(sb->s_root);
 552         p = s = full_path;
 553
 554         do {
 555                 struct inode *dir = dentry->d_inode;
 556                 struct dentry *child;
 557
 558                 if (!dir) {
 559                         dput(dentry);
 560                         dentry = ERR_PTR(-ENOENT);
 561                         break;
 562                 }
 563
 564                 /* skip separators */
 565                 while (*s == sep)
 566                         s++;
 567                 if (!*s)
 568                         break;
 569                 p = s++;
 570                 /* next separator */
 571                 while (*s && *s != sep)
 572                         s++;
 573
 574                 mutex_lock(&dir->i_mutex);
 575                 child = lookup_one_len(p, dentry, s - p);
 576                 mutex_unlock(&dir->i_mutex);
 577                 dput(dentry);
 578                 dentry = child;
 579         } while (!IS_ERR(dentry));
 580         kfree(full_path);
 581         return dentry;
 582 }
 583
 584 static int cifs_set_super(struct super_block *sb, void *data)
 585 {
 586         struct cifs_mnt_data *mnt_data = data;
 587         sb->s_fs_info = mnt_data->cifs_sb;
 588         return set_anon_super(sb, NULL);
 589 }
 590
 591 static struct dentry *
 592 cifs_do_mount(struct file_system_type *fs_type,
 593               int flags, const char *dev_name, void *data)
 594 {
 595         int rc;
 596         struct super_block *sb;
 597         struct cifs_sb_info *cifs_sb;
 598         struct smb_vol *volume_info;
 599         struct cifs_mnt_data mnt_data;
 600         struct dentry *root;
 601
 602         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 603
 604         volume_info = cifs_get_volume_info((char *)data, dev_name);
 605         if (IS_ERR(volume_info))
 606                 return ERR_CAST(volume_info);
 607
 608         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 609         if (cifs_sb == NULL) {
 610                 root = ERR_PTR(-ENOMEM);
 611                 goto out_nls;
 612         }
 613
 614         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 615         if (cifs_sb->mountdata == NULL) {
 616                 root = ERR_PTR(-ENOMEM);
 617                 goto out_cifs_sb;
 618         }
 619
 620         cifs_setup_cifs_sb(volume_info, cifs_sb);
 621
 622         rc = cifs_mount(cifs_sb, volume_info);
 623         if (rc) {
 624                 if (!(flags & MS_SILENT))
 625                         cERROR(1, "cifs_mount failed w/return code = %d", rc);
 626                 root = ERR_PTR(rc);
 627                 goto out_mountdata;
 628         }
 629
 630         mnt_data.vol = volume_info;
 631         mnt_data.cifs_sb = cifs_sb;
 632         mnt_data.flags = flags;
 633
 634         /* BB should we make this contingent on mount parm? */
 635         flags |= MS_NODIRATIME | MS_NOATIME;
 636
 637         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 638         if (IS_ERR(sb)) {
 639                 root = ERR_CAST(sb);
 640                 cifs_umount(cifs_sb);
 641                 goto out;
 642         }
 643
 644         if (sb->s_root) {
 645                 cFYI(1, "Use existing superblock");
 646                 cifs_umount(cifs_sb);
 647         } else {
 648                 rc = cifs_read_super(sb);
 649                 if (rc) {
 650                         root = ERR_PTR(rc);
 651                         goto out_super;
 652                 }
 653
 654                 sb->s_flags |= MS_ACTIVE;
 655         }
 656
 657         root = cifs_get_root(volume_info, sb);
 658         if (IS_ERR(root))
 659                 goto out_super;
 660
 661         cFYI(1, "dentry root is: %p", root);
 662         goto out;
 663
 664 out_super:
 665         deactivate_locked_super(sb);
 666 out:
 667         cifs_cleanup_volume_info(volume_info);
 668         return root;
 669
 670 out_mountdata:
 671         kfree(cifs_sb->mountdata);
 672 out_cifs_sb:
 673         kfree(cifs_sb);
 674 out_nls:
 675         unload_nls(volume_info->local_nls);
 676         goto out;
 677 }
 678
 679 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 680                                    unsigned long nr_segs, loff_t pos)
 681 {
 682         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 683         ssize_t written;
 684         int rc;
 685
 686         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 687
 688         if (CIFS_I(inode)->clientCanCacheAll)
 689                 return written;
 690
 691         rc = filemap_fdatawrite(inode->i_mapping);
 692         if (rc)
 693                 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
 694
 695         return written;
 696 }
 697
 698 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 699 {
 700         /*
 701          * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 702          * the cached file length
 703          */
 704         if (origin != SEEK_SET && origin != SEEK_CUR) {
 705                 int rc;
 706                 struct inode *inode = file->f_path.dentry->d_inode;
 707
 708                 /*
 709                  * We need to be sure that all dirty pages are written and the
 710                  * server has the newest file length.
 711                  */
 712                 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
 713                     inode->i_mapping->nrpages != 0) {
 714                         rc = filemap_fdatawait(inode->i_mapping);
 715                         if (rc) {
 716                                 mapping_set_error(inode->i_mapping, rc);
 717                                 return rc;
 718                         }
 719                 }
 720                 /*
 721                  * Some applications poll for the file length in this strange
 722                  * way so we must seek to end on non-oplocked files by
 723                  * setting the revalidate time to zero.
 724                  */
 725                 CIFS_I(inode)->time = 0;
 726
 727                 rc = cifs_revalidate_file_attr(file);
 728                 if (rc < 0)
 729                         return (loff_t)rc;
 730         }
 731         return generic_file_llseek(file, offset, origin);
 732 }
 733
 734 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 735 {
 736         /* note that this is called by vfs setlease with lock_flocks held
 737            to protect *lease from going away */
 738         struct inode *inode = file->f_path.dentry->d_inode;
 739         struct cifsFileInfo *cfile = file->private_data;
 740
 741         if (!(S_ISREG(inode->i_mode)))
 742                 return -EINVAL;
 743
 744         /* check if file is oplocked */
 745         if (((arg == F_RDLCK) &&
 746                 (CIFS_I(inode)->clientCanCacheRead)) ||
 747             ((arg == F_WRLCK) &&
 748                 (CIFS_I(inode)->clientCanCacheAll)))
 749                 return generic_setlease(file, arg, lease);
 750         else if (tlink_tcon(cfile->tlink)->local_lease &&
 751                  !CIFS_I(inode)->clientCanCacheRead)
 752                 /* If the server claims to support oplock on this
 753                    file, then we still need to check oplock even
 754                    if the local_lease mount option is set, but there
 755                    are servers which do not support oplock for which
 756                    this mount option may be useful if the user
 757                    knows that the file won't be changed on the server
 758                    by anyone else */
 759                 return generic_setlease(file, arg, lease);
 760         else
 761                 return -EAGAIN;
 762 }
 763
 764 struct file_system_type cifs_fs_type = {
 765         .owner = THIS_MODULE,
 766         .name = "cifs",
 767         .mount = cifs_do_mount,
 768         .kill_sb = cifs_kill_sb,
 769         /*  .fs_flags */
 770 };
 771 const struct inode_operations cifs_dir_inode_ops = {
 772         .create = cifs_create,
 773         .atomic_open = cifs_atomic_open,
 774         .lookup = cifs_lookup,
 775         .getattr = cifs_getattr,
 776         .unlink = cifs_unlink,
 777         .link = cifs_hardlink,
 778         .mkdir = cifs_mkdir,
 779         .rmdir = cifs_rmdir,
 780         .rename = cifs_rename,
 781         .permission = cifs_permission,
 782 /*      revalidate:cifs_revalidate,   */
 783         .setattr = cifs_setattr,
 784         .symlink = cifs_symlink,
 785         .mknod   = cifs_mknod,
 786 #ifdef CONFIG_CIFS_XATTR
 787         .setxattr = cifs_setxattr,
 788         .getxattr = cifs_getxattr,
 789         .listxattr = cifs_listxattr,
 790         .removexattr = cifs_removexattr,
 791 #endif
 792 };
 793
 794 const struct inode_operations cifs_file_inode_ops = {
 795 /*      revalidate:cifs_revalidate, */
 796         .setattr = cifs_setattr,
 797         .getattr = cifs_getattr, /* do we need this anymore? */
 798         .rename = cifs_rename,
 799         .permission = cifs_permission,
 800 #ifdef CONFIG_CIFS_XATTR
 801         .setxattr = cifs_setxattr,
 802         .getxattr = cifs_getxattr,
 803         .listxattr = cifs_listxattr,
 804         .removexattr = cifs_removexattr,
 805 #endif
 806 };
 807
 808 const struct inode_operations cifs_symlink_inode_ops = {
 809         .readlink = generic_readlink,
 810         .follow_link = cifs_follow_link,
 811         .put_link = cifs_put_link,
 812         .permission = cifs_permission,
 813         /* BB add the following two eventually */
 814         /* revalidate: cifs_revalidate,
 815            setattr:    cifs_notify_change, *//* BB do we need notify change */
 816 #ifdef CONFIG_CIFS_XATTR
 817         .setxattr = cifs_setxattr,
 818         .getxattr = cifs_getxattr,
 819         .listxattr = cifs_listxattr,
 820         .removexattr = cifs_removexattr,
 821 #endif
 822 };
 823
 824 const struct file_operations cifs_file_ops = {
 825         .read = do_sync_read,
 826         .write = do_sync_write,
 827         .aio_read = generic_file_aio_read,
 828         .aio_write = cifs_file_aio_write,
 829         .open = cifs_open,
 830         .release = cifs_close,
 831         .lock = cifs_lock,
 832         .fsync = cifs_fsync,
 833         .flush = cifs_flush,
 834         .mmap  = cifs_file_mmap,
 835         .splice_read = generic_file_splice_read,
 836         .llseek = cifs_llseek,
 837 #ifdef CONFIG_CIFS_POSIX
 838         .unlocked_ioctl = cifs_ioctl,
 839 #endif /* CONFIG_CIFS_POSIX */
 840         .setlease = cifs_setlease,
 841 };
 842
 843 const struct file_operations cifs_file_strict_ops = {
 844         .read = do_sync_read,
 845         .write = do_sync_write,
 846         .aio_read = cifs_strict_readv,
 847         .aio_write = cifs_strict_writev,
 848         .open = cifs_open,
 849         .release = cifs_close,
 850         .lock = cifs_lock,
 851         .fsync = cifs_strict_fsync,
 852         .flush = cifs_flush,
 853         .mmap = cifs_file_strict_mmap,
 854         .splice_read = generic_file_splice_read,
 855         .llseek = cifs_llseek,
 856 #ifdef CONFIG_CIFS_POSIX
 857         .unlocked_ioctl = cifs_ioctl,
 858 #endif /* CONFIG_CIFS_POSIX */
 859         .setlease = cifs_setlease,
 860 };
 861
 862 const struct file_operations cifs_file_direct_ops = {
 863         /* BB reevaluate whether they can be done with directio, no cache */
 864         .read = do_sync_read,
 865         .write = do_sync_write,
 866         .aio_read = cifs_user_readv,
 867         .aio_write = cifs_user_writev,
 868         .open = cifs_open,
 869         .release = cifs_close,
 870         .lock = cifs_lock,
 871         .fsync = cifs_fsync,
 872         .flush = cifs_flush,
 873         .mmap = cifs_file_mmap,
 874         .splice_read = generic_file_splice_read,
 875 #ifdef CONFIG_CIFS_POSIX
 876         .unlocked_ioctl  = cifs_ioctl,
 877 #endif /* CONFIG_CIFS_POSIX */
 878         .llseek = cifs_llseek,
 879         .setlease = cifs_setlease,
 880 };
 881
 882 const struct file_operations cifs_file_nobrl_ops = {
 883         .read = do_sync_read,
 884         .write = do_sync_write,
 885         .aio_read = generic_file_aio_read,
 886         .aio_write = cifs_file_aio_write,
 887         .open = cifs_open,
 888         .release = cifs_close,
 889         .fsync = cifs_fsync,
 890         .flush = cifs_flush,
 891         .mmap  = cifs_file_mmap,
 892         .splice_read = generic_file_splice_read,
 893         .llseek = cifs_llseek,
 894 #ifdef CONFIG_CIFS_POSIX
 895         .unlocked_ioctl = cifs_ioctl,
 896 #endif /* CONFIG_CIFS_POSIX */
 897         .setlease = cifs_setlease,
 898 };
 899
 900 const struct file_operations cifs_file_strict_nobrl_ops = {
 901         .read = do_sync_read,
 902         .write = do_sync_write,
 903         .aio_read = cifs_strict_readv,
 904         .aio_write = cifs_strict_writev,
 905         .open = cifs_open,
 906         .release = cifs_close,
 907         .fsync = cifs_strict_fsync,
 908         .flush = cifs_flush,
 909         .mmap = cifs_file_strict_mmap,
 910         .splice_read = generic_file_splice_read,
 911         .llseek = cifs_llseek,
 912 #ifdef CONFIG_CIFS_POSIX
 913         .unlocked_ioctl = cifs_ioctl,
 914 #endif /* CONFIG_CIFS_POSIX */
 915         .setlease = cifs_setlease,
 916 };
 917
 918 const struct file_operations cifs_file_direct_nobrl_ops = {
 919         /* BB reevaluate whether they can be done with directio, no cache */
 920         .read = do_sync_read,
 921         .write = do_sync_write,
 922         .aio_read = cifs_user_readv,
 923         .aio_write = cifs_user_writev,
 924         .open = cifs_open,
 925         .release = cifs_close,
 926         .fsync = cifs_fsync,
 927         .flush = cifs_flush,
 928         .mmap = cifs_file_mmap,
 929         .splice_read = generic_file_splice_read,
 930 #ifdef CONFIG_CIFS_POSIX
 931         .unlocked_ioctl  = cifs_ioctl,
 932 #endif /* CONFIG_CIFS_POSIX */
 933         .llseek = cifs_llseek,
 934         .setlease = cifs_setlease,
 935 };
 936
 937 const struct file_operations cifs_dir_ops = {
 938         .readdir = cifs_readdir,
 939         .release = cifs_closedir,
 940         .read    = generic_read_dir,
 941         .unlocked_ioctl  = cifs_ioctl,
 942         .llseek = generic_file_llseek,
 943 };
 944
 945 static void
 946 cifs_init_once(void *inode)
 947 {
 948         struct cifsInodeInfo *cifsi = inode;
 949
 950         inode_init_once(&cifsi->vfs_inode);
 951         init_rwsem(&cifsi->lock_sem);
 952 }
 953
 954 static int
 955 cifs_init_inodecache(void)
 956 {
 957         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 958                                               sizeof(struct cifsInodeInfo),
 959                                               0, (SLAB_RECLAIM_ACCOUNT|
 960                                                 SLAB_MEM_SPREAD),
 961                                               cifs_init_once);
 962         if (cifs_inode_cachep == NULL)
 963                 return -ENOMEM;
 964
 965         return 0;
 966 }
 967
 968 static void
 969 cifs_destroy_inodecache(void)
 970 {
 971         /*
 972          * Make sure all delayed rcu free inodes are flushed before we
 973          * destroy cache.
 974          */
 975         rcu_barrier();
 976         kmem_cache_destroy(cifs_inode_cachep);
 977 }
 978
 979 static int
 980 cifs_init_request_bufs(void)
 981 {
 982         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
 983 #ifdef CONFIG_CIFS_SMB2
 984         /*
 985          * SMB2 maximum header size is bigger than CIFS one - no problems to
 986          * allocate some more bytes for CIFS.
 987          */
 988         max_hdr_size = MAX_SMB2_HDR_SIZE;
 989 #endif
 990         if (CIFSMaxBufSize < 8192) {
 991         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 992         Unicode path name has to fit in any SMB/CIFS path based frames */
 993                 CIFSMaxBufSize = 8192;
 994         } else if (CIFSMaxBufSize > 1024*127) {
 995                 CIFSMaxBufSize = 1024 * 127;
 996         } else {
 997                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 998         }
 999 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
1000         cifs_req_cachep = kmem_cache_create("cifs_request",
1001                                             CIFSMaxBufSize + max_hdr_size, 0,
1002                                             SLAB_HWCACHE_ALIGN, NULL);
1003         if (cifs_req_cachep == NULL)
1004                 return -ENOMEM;
1005
1006         if (cifs_min_rcv < 1)
1007                 cifs_min_rcv = 1;
1008         else if (cifs_min_rcv > 64) {
1009                 cifs_min_rcv = 64;
1010                 cERROR(1, "cifs_min_rcv set to maximum (64)");
1011         }
1012
1013         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1014                                                   cifs_req_cachep);
1015
1016         if (cifs_req_poolp == NULL) {
1017                 kmem_cache_destroy(cifs_req_cachep);
1018                 return -ENOMEM;
1019         }
1020         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1021         almost all handle based requests (but not write response, nor is it
1022         sufficient for path based requests).  A smaller size would have
1023         been more efficient (compacting multiple slab items on one 4k page)
1024         for the case in which debug was on, but this larger size allows
1025         more SMBs to use small buffer alloc and is still much more
1026         efficient to alloc 1 per page off the slab compared to 17K (5page)
1027         alloc of large cifs buffers even when page debugging is on */
1028         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1029                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1030                         NULL);
1031         if (cifs_sm_req_cachep == NULL) {
1032                 mempool_destroy(cifs_req_poolp);
1033                 kmem_cache_destroy(cifs_req_cachep);
1034                 return -ENOMEM;
1035         }
1036
1037         if (cifs_min_small < 2)
1038                 cifs_min_small = 2;
1039         else if (cifs_min_small > 256) {
1040                 cifs_min_small = 256;
1041                 cFYI(1, "cifs_min_small set to maximum (256)");
1042         }
1043
1044         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1045                                                      cifs_sm_req_cachep);
1046
1047         if (cifs_sm_req_poolp == NULL) {
1048                 mempool_destroy(cifs_req_poolp);
1049                 kmem_cache_destroy(cifs_req_cachep);
1050                 kmem_cache_destroy(cifs_sm_req_cachep);
1051                 return -ENOMEM;
1052         }
1053
1054         return 0;
1055 }
1056
1057 static void
1058 cifs_destroy_request_bufs(void)
1059 {
1060         mempool_destroy(cifs_req_poolp);
1061         kmem_cache_destroy(cifs_req_cachep);
1062         mempool_destroy(cifs_sm_req_poolp);
1063         kmem_cache_destroy(cifs_sm_req_cachep);
1064 }
1065
1066 static int
1067 cifs_init_mids(void)
1068 {
1069         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1070                                             sizeof(struct mid_q_entry), 0,
1071                                             SLAB_HWCACHE_ALIGN, NULL);
1072         if (cifs_mid_cachep == NULL)
1073                 return -ENOMEM;
1074
1075         /* 3 is a reasonable minimum number of simultaneous operations */
1076         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1077         if (cifs_mid_poolp == NULL) {
1078                 kmem_cache_destroy(cifs_mid_cachep);
1079                 return -ENOMEM;
1080         }
1081
1082         return 0;
1083 }
1084
1085 static void
1086 cifs_destroy_mids(void)
1087 {
1088         mempool_destroy(cifs_mid_poolp);
1089         kmem_cache_destroy(cifs_mid_cachep);
1090 }
1091
1092 static int __init
1093 init_cifs(void)
1094 {
1095         int rc = 0;
1096         cifs_proc_init();
1097         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1098 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1099         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1100         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1101 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1102 /*
1103  *  Initialize Global counters
1104  */
1105         atomic_set(&sesInfoAllocCount, 0);
1106         atomic_set(&tconInfoAllocCount, 0);
1107         atomic_set(&tcpSesAllocCount, 0);
1108         atomic_set(&tcpSesReconnectCount, 0);
1109         atomic_set(&tconInfoReconnectCount, 0);
1110
1111         atomic_set(&bufAllocCount, 0);
1112         atomic_set(&smBufAllocCount, 0);
1113 #ifdef CONFIG_CIFS_STATS2
1114         atomic_set(&totBufAllocCount, 0);
1115         atomic_set(&totSmBufAllocCount, 0);
1116 #endif /* CONFIG_CIFS_STATS2 */
1117
1118         atomic_set(&midCount, 0);
1119         GlobalCurrentXid = 0;
1120         GlobalTotalActiveXid = 0;
1121         GlobalMaxActiveXid = 0;
1122         spin_lock_init(&cifs_tcp_ses_lock);
1123         spin_lock_init(&cifs_file_list_lock);
1124         spin_lock_init(&GlobalMid_Lock);
1125
1126 #ifdef CONFIG_CIFS_SMB2
1127         get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1128 #endif
1129
1130         if (cifs_max_pending < 2) {
1131                 cifs_max_pending = 2;
1132                 cFYI(1, "cifs_max_pending set to min of 2");
1133         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1134                 cifs_max_pending = CIFS_MAX_REQ;
1135                 cFYI(1, "cifs_max_pending set to max of %u", CIFS_MAX_REQ);
1136         }
1137
1138         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1139         if (!cifsiod_wq) {
1140                 rc = -ENOMEM;
1141                 goto out_clean_proc;
1142         }
1143
1144         rc = cifs_fscache_register();
1145         if (rc)
1146                 goto out_destroy_wq;
1147
1148         rc = cifs_init_inodecache();
1149         if (rc)
1150                 goto out_unreg_fscache;
1151
1152         rc = cifs_init_mids();
1153         if (rc)
1154                 goto out_destroy_inodecache;
1155
1156         rc = cifs_init_request_bufs();
1157         if (rc)
1158                 goto out_destroy_mids;
1159
1160 #ifdef CONFIG_CIFS_UPCALL
1161         rc = register_key_type(&cifs_spnego_key_type);
1162         if (rc)
1163                 goto out_destroy_request_bufs;
1164 #endif /* CONFIG_CIFS_UPCALL */
1165
1166 #ifdef CONFIG_CIFS_ACL
1167         rc = init_cifs_idmap();
1168         if (rc)
1169                 goto out_register_key_type;
1170 #endif /* CONFIG_CIFS_ACL */
1171
1172         rc = register_filesystem(&cifs_fs_type);
1173         if (rc)
1174                 goto out_init_cifs_idmap;
1175
1176         return 0;
1177
1178 out_init_cifs_idmap:
1179 #ifdef CONFIG_CIFS_ACL
1180         exit_cifs_idmap();
1181 out_register_key_type:
1182 #endif
1183 #ifdef CONFIG_CIFS_UPCALL
1184         unregister_key_type(&cifs_spnego_key_type);
1185 out_destroy_request_bufs:
1186 #endif
1187         cifs_destroy_request_bufs();
1188 out_destroy_mids:
1189         cifs_destroy_mids();
1190 out_destroy_inodecache:
1191         cifs_destroy_inodecache();
1192 out_unreg_fscache:
1193         cifs_fscache_unregister();
1194 out_destroy_wq:
1195         destroy_workqueue(cifsiod_wq);
1196 out_clean_proc:
1197         cifs_proc_clean();
1198         return rc;
1199 }
1200
1201 static void __exit
1202 exit_cifs(void)
1203 {
1204         cFYI(DBG2, "exit_cifs");
1205         unregister_filesystem(&cifs_fs_type);
1206         cifs_dfs_release_automount_timer();
1207 #ifdef CONFIG_CIFS_ACL
1208         cifs_destroy_idmaptrees();
1209         exit_cifs_idmap();
1210 #endif
1211 #ifdef CONFIG_CIFS_UPCALL
1212         unregister_key_type(&cifs_spnego_key_type);
1213 #endif
1214         cifs_destroy_request_bufs();
1215         cifs_destroy_mids();
1216         cifs_destroy_inodecache();
1217         cifs_fscache_unregister();
1218         destroy_workqueue(cifsiod_wq);
1219         cifs_proc_clean();
1220 }
1221
1222 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1223 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1224 MODULE_DESCRIPTION
1225     ("VFS to access servers complying with the SNIA CIFS Specification "
1226      "e.g. Samba and Windows");
1227 MODULE_VERSION(CIFS_VERSION);
1228 module_init(init_cifs)
1229 module_exit(exit_cifs)