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 traceSMB = 0;
  58 bool enable_oplocks = true;
  59 unsigned int linuxExtEnabled = 1;
  60 unsigned int lookupCacheEnabled = 1;
  61 unsigned int global_secflags = CIFSSEC_DEF;
  62 /* unsigned int ntlmv2_support = 0; */
  63 unsigned int sign_CIFS_PDUs = 1;
  64 static const struct super_operations cifs_super_ops;
  65 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  66 module_param(CIFSMaxBufSize, uint, 0);
  67 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  68                                  "Default: 16384 Range: 8192 to 130048");
  69 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  70 module_param(cifs_min_rcv, uint, 0);
  71 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  72                                 "1 to 64");
  73 unsigned int cifs_min_small = 30;
  74 module_param(cifs_min_small, uint, 0);
  75 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  76                                  "Range: 2 to 256");
  77 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  78 module_param(cifs_max_pending, uint, 0444);
  79 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  80                                    "Default: 32767 Range: 2 to 32767.");
  81 module_param(enable_oplocks, bool, 0644);
  82 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
  83
  84 extern mempool_t *cifs_sm_req_poolp;
  85 extern mempool_t *cifs_req_poolp;
  86 extern mempool_t *cifs_mid_poolp;
  87
  88 struct workqueue_struct *cifsiod_wq;
  89
  90 #ifdef CONFIG_CIFS_SMB2
  91 __u8 cifs_client_guid[SMB2_CLIENT_GUID_SIZE];
  92 #endif
  93
  94 /*
  95  * Bumps refcount for cifs super block.
  96  * Note that it should be only called if a referece to VFS super block is
  97  * already held, e.g. in open-type syscalls context. Otherwise it can race with
  98  * atomic_dec_and_test in deactivate_locked_super.
  99  */
 100 void
 101 cifs_sb_active(struct super_block *sb)
 102 {
 103         struct cifs_sb_info *server = CIFS_SB(sb);
 104
 105         if (atomic_inc_return(&server->active) == 1)
 106                 atomic_inc(&sb->s_active);
 107 }
 108
 109 void
 110 cifs_sb_deactive(struct super_block *sb)
 111 {
 112         struct cifs_sb_info *server = CIFS_SB(sb);
 113
 114         if (atomic_dec_and_test(&server->active))
 115                 deactivate_super(sb);
 116 }
 117
 118 static int
 119 cifs_read_super(struct super_block *sb)
 120 {
 121         struct inode *inode;
 122         struct cifs_sb_info *cifs_sb;
 123         int rc = 0;
 124
 125         cifs_sb = CIFS_SB(sb);
 126
 127         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
 128                 sb->s_flags |= MS_POSIXACL;
 129
 130         if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES)
 131                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 132         else
 133                 sb->s_maxbytes = MAX_NON_LFS;
 134
 135         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
 136         sb->s_time_gran = 100;
 137
 138         sb->s_magic = CIFS_MAGIC_NUMBER;
 139         sb->s_op = &cifs_super_ops;
 140         sb->s_bdi = &cifs_sb->bdi;
 141         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 142         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 143         inode = cifs_root_iget(sb);
 144
 145         if (IS_ERR(inode)) {
 146                 rc = PTR_ERR(inode);
 147                 goto out_no_root;
 148         }
 149
 150         sb->s_root = d_make_root(inode);
 151         if (!sb->s_root) {
 152                 rc = -ENOMEM;
 153                 goto out_no_root;
 154         }
 155
 156         /* do that *after* d_make_root() - we want NULL ->d_op for root here */
 157         if (cifs_sb_master_tcon(cifs_sb)->nocase)
 158                 sb->s_d_op = &cifs_ci_dentry_ops;
 159         else
 160                 sb->s_d_op = &cifs_dentry_ops;
 161
 162 #ifdef CONFIG_CIFS_NFSD_EXPORT
 163         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 164                 cFYI(1, "export ops supported");
 165                 sb->s_export_op = &cifs_export_ops;
 166         }
 167 #endif /* CONFIG_CIFS_NFSD_EXPORT */
 168
 169         return 0;
 170
 171 out_no_root:
 172         cERROR(1, "cifs_read_super: get root inode failed");
 173         return rc;
 174 }
 175
 176 static void cifs_kill_sb(struct super_block *sb)
 177 {
 178         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 179         kill_anon_super(sb);
 180         cifs_umount(cifs_sb);
 181 }
 182
 183 static int
 184 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 185 {
 186         struct super_block *sb = dentry->d_sb;
 187         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 188         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 189         struct TCP_Server_Info *server = tcon->ses->server;
 190         unsigned int xid;
 191         int rc = 0;
 192
 193         xid = get_xid();
 194
 195         /*
 196          * PATH_MAX may be too long - it would presumably be total path,
 197          * but note that some servers (includinng Samba 3) have a shorter
 198          * maximum path.
 199          *
 200          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 201          */
 202         buf->f_namelen = PATH_MAX;
 203         buf->f_files = 0;       /* undefined */
 204         buf->f_ffree = 0;       /* unlimited */
 205
 206         if (server->ops->queryfs)
 207                 rc = server->ops->queryfs(xid, tcon, buf);
 208
 209         free_xid(xid);
 210         return 0;
 211 }
 212
 213 static int cifs_permission(struct inode *inode, int mask)
 214 {
 215         struct cifs_sb_info *cifs_sb;
 216
 217         cifs_sb = CIFS_SB(inode->i_sb);
 218
 219         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 220                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 221                         return -EACCES;
 222                 else
 223                         return 0;
 224         } else /* file mode might have been restricted at mount time
 225                 on the client (above and beyond ACL on servers) for
 226                 servers which do not support setting and viewing mode bits,
 227                 so allowing client to check permissions is useful */
 228                 return generic_permission(inode, mask);
 229 }
 230
 231 static struct kmem_cache *cifs_inode_cachep;
 232 static struct kmem_cache *cifs_req_cachep;
 233 static struct kmem_cache *cifs_mid_cachep;
 234 static struct kmem_cache *cifs_sm_req_cachep;
 235 mempool_t *cifs_sm_req_poolp;
 236 mempool_t *cifs_req_poolp;
 237 mempool_t *cifs_mid_poolp;
 238
 239 static struct inode *
 240 cifs_alloc_inode(struct super_block *sb)
 241 {
 242         struct cifsInodeInfo *cifs_inode;
 243         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 244         if (!cifs_inode)
 245                 return NULL;
 246         cifs_inode->cifsAttrs = 0x20;   /* default */
 247         cifs_inode->time = 0;
 248         /*
 249          * Until the file is open and we have gotten oplock info back from the
 250          * server, can not assume caching of file data or metadata.
 251          */
 252         cifs_set_oplock_level(cifs_inode, 0);
 253         cifs_inode->delete_pending = false;
 254         cifs_inode->invalid_mapping = false;
 255         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 256         cifs_inode->server_eof = 0;
 257         cifs_inode->uniqueid = 0;
 258         cifs_inode->createtime = 0;
 259 #ifdef CONFIG_CIFS_SMB2
 260         get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
 261 #endif
 262         /*
 263          * Can not set i_flags here - they get immediately overwritten to zero
 264          * by the VFS.
 265          */
 266         /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
 267         INIT_LIST_HEAD(&cifs_inode->openFileList);
 268         INIT_LIST_HEAD(&cifs_inode->llist);
 269         return &cifs_inode->vfs_inode;
 270 }
 271
 272 static void cifs_i_callback(struct rcu_head *head)
 273 {
 274         struct inode *inode = container_of(head, struct inode, i_rcu);
 275         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 276 }
 277
 278 static void
 279 cifs_destroy_inode(struct inode *inode)
 280 {
 281         call_rcu(&inode->i_rcu, cifs_i_callback);
 282 }
 283
 284 static void
 285 cifs_evict_inode(struct inode *inode)
 286 {
 287         truncate_inode_pages(&inode->i_data, 0);
 288         clear_inode(inode);
 289         cifs_fscache_release_inode_cookie(inode);
 290 }
 291
 292 static void
 293 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 294 {
 295         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 296         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 297
 298         seq_printf(s, ",addr=");
 299
 300         switch (server->dstaddr.ss_family) {
 301         case AF_INET:
 302                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 303                 break;
 304         case AF_INET6:
 305                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 306                 if (sa6->sin6_scope_id)
 307                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 308                 break;
 309         default:
 310                 seq_printf(s, "(unknown)");
 311         }
 312 }
 313
 314 static void
 315 cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server)
 316 {
 317         seq_printf(s, ",sec=");
 318
 319         switch (server->secType) {
 320         case LANMAN:
 321                 seq_printf(s, "lanman");
 322                 break;
 323         case NTLMv2:
 324                 seq_printf(s, "ntlmv2");
 325                 break;
 326         case NTLM:
 327                 seq_printf(s, "ntlm");
 328                 break;
 329         case Kerberos:
 330                 seq_printf(s, "krb5");
 331                 break;
 332         case RawNTLMSSP:
 333                 seq_printf(s, "ntlmssp");
 334                 break;
 335         default:
 336                 /* shouldn't ever happen */
 337                 seq_printf(s, "unknown");
 338                 break;
 339         }
 340
 341         if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
 342                 seq_printf(s, "i");
 343 }
 344
 345 static void
 346 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
 347 {
 348         seq_printf(s, ",cache=");
 349
 350         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
 351                 seq_printf(s, "strict");
 352         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 353                 seq_printf(s, "none");
 354         else
 355                 seq_printf(s, "loose");
 356 }
 357
 358 /*
 359  * cifs_show_options() is for displaying mount options in /proc/mounts.
 360  * Not all settable options are displayed but most of the important
 361  * ones are.
 362  */
 363 static int
 364 cifs_show_options(struct seq_file *s, struct dentry *root)
 365 {
 366         struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
 367         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 368         struct sockaddr *srcaddr;
 369         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 370
 371         seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
 372         cifs_show_security(s, tcon->ses->server);
 373         cifs_show_cache_flavor(s, cifs_sb);
 374
 375         seq_printf(s, ",unc=");
 376         seq_escape(s, tcon->treeName, " \t\n\\");
 377
 378         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 379                 seq_printf(s, ",multiuser");
 380         else if (tcon->ses->user_name)
 381                 seq_printf(s, ",username=%s", tcon->ses->user_name);
 382
 383         if (tcon->ses->domainName)
 384                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 385
 386         if (srcaddr->sa_family != AF_UNSPEC) {
 387                 struct sockaddr_in *saddr4;
 388                 struct sockaddr_in6 *saddr6;
 389                 saddr4 = (struct sockaddr_in *)srcaddr;
 390                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 391                 if (srcaddr->sa_family == AF_INET6)
 392                         seq_printf(s, ",srcaddr=%pI6c",
 393                                    &saddr6->sin6_addr);
 394                 else if (srcaddr->sa_family == AF_INET)
 395                         seq_printf(s, ",srcaddr=%pI4",
 396                                    &saddr4->sin_addr.s_addr);
 397                 else
 398                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 399                                    (int)(srcaddr->sa_family));
 400         }
 401
 402         seq_printf(s, ",uid=%u",
 403                    from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
 404         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 405                 seq_printf(s, ",forceuid");
 406         else
 407                 seq_printf(s, ",noforceuid");
 408
 409         seq_printf(s, ",gid=%u",
 410                    from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
 411         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 412                 seq_printf(s, ",forcegid");
 413         else
 414                 seq_printf(s, ",noforcegid");
 415
 416         cifs_show_address(s, tcon->ses->server);
 417
 418         if (!tcon->unix_ext)
 419                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 420                                            cifs_sb->mnt_file_mode,
 421                                            cifs_sb->mnt_dir_mode);
 422         if (tcon->seal)
 423                 seq_printf(s, ",seal");
 424         if (tcon->nocase)
 425                 seq_printf(s, ",nocase");
 426         if (tcon->retry)
 427                 seq_printf(s, ",hard");
 428         if (tcon->unix_ext)
 429                 seq_printf(s, ",unix");
 430         else
 431                 seq_printf(s, ",nounix");
 432         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 433                 seq_printf(s, ",posixpaths");
 434         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 435                 seq_printf(s, ",setuids");
 436         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 437                 seq_printf(s, ",serverino");
 438         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 439                 seq_printf(s, ",rwpidforward");
 440         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 441                 seq_printf(s, ",forcemand");
 442         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 443                 seq_printf(s, ",nouser_xattr");
 444         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 445                 seq_printf(s, ",mapchars");
 446         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 447                 seq_printf(s, ",sfu");
 448         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 449                 seq_printf(s, ",nobrl");
 450         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 451                 seq_printf(s, ",cifsacl");
 452         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 453                 seq_printf(s, ",dynperm");
 454         if (root->d_sb->s_flags & MS_POSIXACL)
 455                 seq_printf(s, ",acl");
 456         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 457                 seq_printf(s, ",mfsymlinks");
 458         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 459                 seq_printf(s, ",fsc");
 460         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 461                 seq_printf(s, ",nostrictsync");
 462         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 463                 seq_printf(s, ",noperm");
 464         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 465                 seq_printf(s, ",backupuid=%u",
 466                            from_kuid_munged(&init_user_ns,
 467                                             cifs_sb->mnt_backupuid));
 468         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 469                 seq_printf(s, ",backupgid=%u",
 470                            from_kgid_munged(&init_user_ns,
 471                                             cifs_sb->mnt_backupgid));
 472
 473         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 474         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 475         /* convert actimeo and display it in seconds */
 476         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 477
 478         return 0;
 479 }
 480
 481 static void cifs_umount_begin(struct super_block *sb)
 482 {
 483         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 484         struct cifs_tcon *tcon;
 485
 486         if (cifs_sb == NULL)
 487                 return;
 488
 489         tcon = cifs_sb_master_tcon(cifs_sb);
 490
 491         spin_lock(&cifs_tcp_ses_lock);
 492         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 493                 /* we have other mounts to same share or we have
 494                    already tried to force umount this and woken up
 495                    all waiting network requests, nothing to do */
 496                 spin_unlock(&cifs_tcp_ses_lock);
 497                 return;
 498         } else if (tcon->tc_count == 1)
 499                 tcon->tidStatus = CifsExiting;
 500         spin_unlock(&cifs_tcp_ses_lock);
 501
 502         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 503         /* cancel_notify_requests(tcon); */
 504         if (tcon->ses && tcon->ses->server) {
 505                 cFYI(1, "wake up tasks now - umount begin not complete");
 506                 wake_up_all(&tcon->ses->server->request_q);
 507                 wake_up_all(&tcon->ses->server->response_q);
 508                 msleep(1); /* yield */
 509                 /* we have to kick the requests once more */
 510                 wake_up_all(&tcon->ses->server->response_q);
 511                 msleep(1);
 512         }
 513
 514         return;
 515 }
 516
 517 #ifdef CONFIG_CIFS_STATS2
 518 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 519 {
 520         /* BB FIXME */
 521         return 0;
 522 }
 523 #endif
 524
 525 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 526 {
 527         *flags |= MS_NODIRATIME;
 528         return 0;
 529 }
 530
 531 static int cifs_drop_inode(struct inode *inode)
 532 {
 533         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 534
 535         /* no serverino => unconditional eviction */
 536         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 537                 generic_drop_inode(inode);
 538 }
 539
 540 static const struct super_operations cifs_super_ops = {
 541         .statfs = cifs_statfs,
 542         .alloc_inode = cifs_alloc_inode,
 543         .destroy_inode = cifs_destroy_inode,
 544         .drop_inode     = cifs_drop_inode,
 545         .evict_inode    = cifs_evict_inode,
 546 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 547         function unless later we add lazy close of inodes or unless the
 548         kernel forgets to call us with the same number of releases (closes)
 549         as opens */
 550         .show_options = cifs_show_options,
 551         .umount_begin   = cifs_umount_begin,
 552         .remount_fs = cifs_remount,
 553 #ifdef CONFIG_CIFS_STATS2
 554         .show_stats = cifs_show_stats,
 555 #endif
 556 };
 557
 558 /*
 559  * Get root dentry from superblock according to prefix path mount option.
 560  * Return dentry with refcount + 1 on success and NULL otherwise.
 561  */
 562 static struct dentry *
 563 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 564 {
 565         struct dentry *dentry;
 566         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 567         char *full_path = NULL;
 568         char *s, *p;
 569         char sep;
 570
 571         full_path = cifs_build_path_to_root(vol, cifs_sb,
 572                                             cifs_sb_master_tcon(cifs_sb));
 573         if (full_path == NULL)
 574                 return ERR_PTR(-ENOMEM);
 575
 576         cFYI(1, "Get root dentry for %s", full_path);
 577
 578         sep = CIFS_DIR_SEP(cifs_sb);
 579         dentry = dget(sb->s_root);
 580         p = s = full_path;
 581
 582         do {
 583                 struct inode *dir = dentry->d_inode;
 584                 struct dentry *child;
 585
 586                 if (!dir) {
 587                         dput(dentry);
 588                         dentry = ERR_PTR(-ENOENT);
 589                         break;
 590                 }
 591                 if (!S_ISDIR(dir->i_mode)) {
 592                         dput(dentry);
 593                         dentry = ERR_PTR(-ENOTDIR);
 594                         break;
 595                 }
 596
 597                 /* skip separators */
 598                 while (*s == sep)
 599                         s++;
 600                 if (!*s)
 601                         break;
 602                 p = s++;
 603                 /* next separator */
 604                 while (*s && *s != sep)
 605                         s++;
 606
 607                 mutex_lock(&dir->i_mutex);
 608                 child = lookup_one_len(p, dentry, s - p);
 609                 mutex_unlock(&dir->i_mutex);
 610                 dput(dentry);
 611                 dentry = child;
 612         } while (!IS_ERR(dentry));
 613         kfree(full_path);
 614         return dentry;
 615 }
 616
 617 static int cifs_set_super(struct super_block *sb, void *data)
 618 {
 619         struct cifs_mnt_data *mnt_data = data;
 620         sb->s_fs_info = mnt_data->cifs_sb;
 621         return set_anon_super(sb, NULL);
 622 }
 623
 624 static struct dentry *
 625 cifs_do_mount(struct file_system_type *fs_type,
 626               int flags, const char *dev_name, void *data)
 627 {
 628         int rc;
 629         struct super_block *sb;
 630         struct cifs_sb_info *cifs_sb;
 631         struct smb_vol *volume_info;
 632         struct cifs_mnt_data mnt_data;
 633         struct dentry *root;
 634
 635         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 636
 637         volume_info = cifs_get_volume_info((char *)data, dev_name);
 638         if (IS_ERR(volume_info))
 639                 return ERR_CAST(volume_info);
 640
 641         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 642         if (cifs_sb == NULL) {
 643                 root = ERR_PTR(-ENOMEM);
 644                 goto out_nls;
 645         }
 646
 647         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 648         if (cifs_sb->mountdata == NULL) {
 649                 root = ERR_PTR(-ENOMEM);
 650                 goto out_cifs_sb;
 651         }
 652
 653         cifs_setup_cifs_sb(volume_info, cifs_sb);
 654
 655         rc = cifs_mount(cifs_sb, volume_info);
 656         if (rc) {
 657                 if (!(flags & MS_SILENT))
 658                         cERROR(1, "cifs_mount failed w/return code = %d", rc);
 659                 root = ERR_PTR(rc);
 660                 goto out_mountdata;
 661         }
 662
 663         mnt_data.vol = volume_info;
 664         mnt_data.cifs_sb = cifs_sb;
 665         mnt_data.flags = flags;
 666
 667         /* BB should we make this contingent on mount parm? */
 668         flags |= MS_NODIRATIME | MS_NOATIME;
 669
 670         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 671         if (IS_ERR(sb)) {
 672                 root = ERR_CAST(sb);
 673                 cifs_umount(cifs_sb);
 674                 goto out;
 675         }
 676
 677         if (sb->s_root) {
 678                 cFYI(1, "Use existing superblock");
 679                 cifs_umount(cifs_sb);
 680         } else {
 681                 rc = cifs_read_super(sb);
 682                 if (rc) {
 683                         root = ERR_PTR(rc);
 684                         goto out_super;
 685                 }
 686
 687                 sb->s_flags |= MS_ACTIVE;
 688         }
 689
 690         root = cifs_get_root(volume_info, sb);
 691         if (IS_ERR(root))
 692                 goto out_super;
 693
 694         cFYI(1, "dentry root is: %p", root);
 695         goto out;
 696
 697 out_super:
 698         deactivate_locked_super(sb);
 699 out:
 700         cifs_cleanup_volume_info(volume_info);
 701         return root;
 702
 703 out_mountdata:
 704         kfree(cifs_sb->mountdata);
 705 out_cifs_sb:
 706         kfree(cifs_sb);
 707 out_nls:
 708         unload_nls(volume_info->local_nls);
 709         goto out;
 710 }
 711
 712 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 713                                    unsigned long nr_segs, loff_t pos)
 714 {
 715         struct inode *inode = file_inode(iocb->ki_filp);
 716         ssize_t written;
 717         int rc;
 718
 719         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 720
 721         if (CIFS_I(inode)->clientCanCacheAll)
 722                 return written;
 723
 724         rc = filemap_fdatawrite(inode->i_mapping);
 725         if (rc)
 726                 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
 727
 728         return written;
 729 }
 730
 731 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
 732 {
 733         /*
 734          * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 735          * the cached file length
 736          */
 737         if (whence != SEEK_SET && whence != SEEK_CUR) {
 738                 int rc;
 739                 struct inode *inode = file_inode(file);
 740
 741                 /*
 742                  * We need to be sure that all dirty pages are written and the
 743                  * server has the newest file length.
 744                  */
 745                 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
 746                     inode->i_mapping->nrpages != 0) {
 747                         rc = filemap_fdatawait(inode->i_mapping);
 748                         if (rc) {
 749                                 mapping_set_error(inode->i_mapping, rc);
 750                                 return rc;
 751                         }
 752                 }
 753                 /*
 754                  * Some applications poll for the file length in this strange
 755                  * way so we must seek to end on non-oplocked files by
 756                  * setting the revalidate time to zero.
 757                  */
 758                 CIFS_I(inode)->time = 0;
 759
 760                 rc = cifs_revalidate_file_attr(file);
 761                 if (rc < 0)
 762                         return (loff_t)rc;
 763         }
 764         return generic_file_llseek(file, offset, whence);
 765 }
 766
 767 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 768 {
 769         /* note that this is called by vfs setlease with lock_flocks held
 770            to protect *lease from going away */
 771         struct inode *inode = file_inode(file);
 772         struct cifsFileInfo *cfile = file->private_data;
 773
 774         if (!(S_ISREG(inode->i_mode)))
 775                 return -EINVAL;
 776
 777         /* check if file is oplocked */
 778         if (((arg == F_RDLCK) &&
 779                 (CIFS_I(inode)->clientCanCacheRead)) ||
 780             ((arg == F_WRLCK) &&
 781                 (CIFS_I(inode)->clientCanCacheAll)))
 782                 return generic_setlease(file, arg, lease);
 783         else if (tlink_tcon(cfile->tlink)->local_lease &&
 784                  !CIFS_I(inode)->clientCanCacheRead)
 785                 /* If the server claims to support oplock on this
 786                    file, then we still need to check oplock even
 787                    if the local_lease mount option is set, but there
 788                    are servers which do not support oplock for which
 789                    this mount option may be useful if the user
 790                    knows that the file won't be changed on the server
 791                    by anyone else */
 792                 return generic_setlease(file, arg, lease);
 793         else
 794                 return -EAGAIN;
 795 }
 796
 797 struct file_system_type cifs_fs_type = {
 798         .owner = THIS_MODULE,
 799         .name = "cifs",
 800         .mount = cifs_do_mount,
 801         .kill_sb = cifs_kill_sb,
 802         /*  .fs_flags */
 803 };
 804 MODULE_ALIAS_FS("cifs");
 805 const struct inode_operations cifs_dir_inode_ops = {
 806         .create = cifs_create,
 807         .atomic_open = cifs_atomic_open,
 808         .lookup = cifs_lookup,
 809         .getattr = cifs_getattr,
 810         .unlink = cifs_unlink,
 811         .link = cifs_hardlink,
 812         .mkdir = cifs_mkdir,
 813         .rmdir = cifs_rmdir,
 814         .rename = cifs_rename,
 815         .permission = cifs_permission,
 816 /*      revalidate:cifs_revalidate,   */
 817         .setattr = cifs_setattr,
 818         .symlink = cifs_symlink,
 819         .mknod   = cifs_mknod,
 820 #ifdef CONFIG_CIFS_XATTR
 821         .setxattr = cifs_setxattr,
 822         .getxattr = cifs_getxattr,
 823         .listxattr = cifs_listxattr,
 824         .removexattr = cifs_removexattr,
 825 #endif
 826 };
 827
 828 const struct inode_operations cifs_file_inode_ops = {
 829 /*      revalidate:cifs_revalidate, */
 830         .setattr = cifs_setattr,
 831         .getattr = cifs_getattr, /* do we need this anymore? */
 832         .rename = cifs_rename,
 833         .permission = cifs_permission,
 834 #ifdef CONFIG_CIFS_XATTR
 835         .setxattr = cifs_setxattr,
 836         .getxattr = cifs_getxattr,
 837         .listxattr = cifs_listxattr,
 838         .removexattr = cifs_removexattr,
 839 #endif
 840 };
 841
 842 const struct inode_operations cifs_symlink_inode_ops = {
 843         .readlink = generic_readlink,
 844         .follow_link = cifs_follow_link,
 845         .put_link = cifs_put_link,
 846         .permission = cifs_permission,
 847         /* BB add the following two eventually */
 848         /* revalidate: cifs_revalidate,
 849            setattr:    cifs_notify_change, *//* BB do we need notify change */
 850 #ifdef CONFIG_CIFS_XATTR
 851         .setxattr = cifs_setxattr,
 852         .getxattr = cifs_getxattr,
 853         .listxattr = cifs_listxattr,
 854         .removexattr = cifs_removexattr,
 855 #endif
 856 };
 857
 858 const struct file_operations cifs_file_ops = {
 859         .read = do_sync_read,
 860         .write = do_sync_write,
 861         .aio_read = generic_file_aio_read,
 862         .aio_write = cifs_file_aio_write,
 863         .open = cifs_open,
 864         .release = cifs_close,
 865         .lock = cifs_lock,
 866         .fsync = cifs_fsync,
 867         .flush = cifs_flush,
 868         .mmap  = cifs_file_mmap,
 869         .splice_read = generic_file_splice_read,
 870         .llseek = cifs_llseek,
 871 #ifdef CONFIG_CIFS_POSIX
 872         .unlocked_ioctl = cifs_ioctl,
 873 #endif /* CONFIG_CIFS_POSIX */
 874         .setlease = cifs_setlease,
 875 };
 876
 877 const struct file_operations cifs_file_strict_ops = {
 878         .read = do_sync_read,
 879         .write = do_sync_write,
 880         .aio_read = cifs_strict_readv,
 881         .aio_write = cifs_strict_writev,
 882         .open = cifs_open,
 883         .release = cifs_close,
 884         .lock = cifs_lock,
 885         .fsync = cifs_strict_fsync,
 886         .flush = cifs_flush,
 887         .mmap = cifs_file_strict_mmap,
 888         .splice_read = generic_file_splice_read,
 889         .llseek = cifs_llseek,
 890 #ifdef CONFIG_CIFS_POSIX
 891         .unlocked_ioctl = cifs_ioctl,
 892 #endif /* CONFIG_CIFS_POSIX */
 893         .setlease = cifs_setlease,
 894 };
 895
 896 const struct file_operations cifs_file_direct_ops = {
 897         /* BB reevaluate whether they can be done with directio, no cache */
 898         .read = do_sync_read,
 899         .write = do_sync_write,
 900         .aio_read = cifs_user_readv,
 901         .aio_write = cifs_user_writev,
 902         .open = cifs_open,
 903         .release = cifs_close,
 904         .lock = cifs_lock,
 905         .fsync = cifs_fsync,
 906         .flush = cifs_flush,
 907         .mmap = cifs_file_mmap,
 908         .splice_read = generic_file_splice_read,
 909 #ifdef CONFIG_CIFS_POSIX
 910         .unlocked_ioctl  = cifs_ioctl,
 911 #endif /* CONFIG_CIFS_POSIX */
 912         .llseek = cifs_llseek,
 913         .setlease = cifs_setlease,
 914 };
 915
 916 const struct file_operations cifs_file_nobrl_ops = {
 917         .read = do_sync_read,
 918         .write = do_sync_write,
 919         .aio_read = generic_file_aio_read,
 920         .aio_write = cifs_file_aio_write,
 921         .open = cifs_open,
 922         .release = cifs_close,
 923         .fsync = cifs_fsync,
 924         .flush = cifs_flush,
 925         .mmap  = cifs_file_mmap,
 926         .splice_read = generic_file_splice_read,
 927         .llseek = cifs_llseek,
 928 #ifdef CONFIG_CIFS_POSIX
 929         .unlocked_ioctl = cifs_ioctl,
 930 #endif /* CONFIG_CIFS_POSIX */
 931         .setlease = cifs_setlease,
 932 };
 933
 934 const struct file_operations cifs_file_strict_nobrl_ops = {
 935         .read = do_sync_read,
 936         .write = do_sync_write,
 937         .aio_read = cifs_strict_readv,
 938         .aio_write = cifs_strict_writev,
 939         .open = cifs_open,
 940         .release = cifs_close,
 941         .fsync = cifs_strict_fsync,
 942         .flush = cifs_flush,
 943         .mmap = cifs_file_strict_mmap,
 944         .splice_read = generic_file_splice_read,
 945         .llseek = cifs_llseek,
 946 #ifdef CONFIG_CIFS_POSIX
 947         .unlocked_ioctl = cifs_ioctl,
 948 #endif /* CONFIG_CIFS_POSIX */
 949         .setlease = cifs_setlease,
 950 };
 951
 952 const struct file_operations cifs_file_direct_nobrl_ops = {
 953         /* BB reevaluate whether they can be done with directio, no cache */
 954         .read = do_sync_read,
 955         .write = do_sync_write,
 956         .aio_read = cifs_user_readv,
 957         .aio_write = cifs_user_writev,
 958         .open = cifs_open,
 959         .release = cifs_close,
 960         .fsync = cifs_fsync,
 961         .flush = cifs_flush,
 962         .mmap = cifs_file_mmap,
 963         .splice_read = generic_file_splice_read,
 964 #ifdef CONFIG_CIFS_POSIX
 965         .unlocked_ioctl  = cifs_ioctl,
 966 #endif /* CONFIG_CIFS_POSIX */
 967         .llseek = cifs_llseek,
 968         .setlease = cifs_setlease,
 969 };
 970
 971 const struct file_operations cifs_dir_ops = {
 972         .readdir = cifs_readdir,
 973         .release = cifs_closedir,
 974         .read    = generic_read_dir,
 975         .unlocked_ioctl  = cifs_ioctl,
 976         .llseek = generic_file_llseek,
 977 };
 978
 979 static void
 980 cifs_init_once(void *inode)
 981 {
 982         struct cifsInodeInfo *cifsi = inode;
 983
 984         inode_init_once(&cifsi->vfs_inode);
 985         init_rwsem(&cifsi->lock_sem);
 986 }
 987
 988 static int
 989 cifs_init_inodecache(void)
 990 {
 991         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 992                                               sizeof(struct cifsInodeInfo),
 993                                               0, (SLAB_RECLAIM_ACCOUNT|
 994                                                 SLAB_MEM_SPREAD),
 995                                               cifs_init_once);
 996         if (cifs_inode_cachep == NULL)
 997                 return -ENOMEM;
 998
 999         return 0;
1000 }
1001
1002 static void
1003 cifs_destroy_inodecache(void)
1004 {
1005         /*
1006          * Make sure all delayed rcu free inodes are flushed before we
1007          * destroy cache.
1008          */
1009         rcu_barrier();
1010         kmem_cache_destroy(cifs_inode_cachep);
1011 }
1012
1013 static int
1014 cifs_init_request_bufs(void)
1015 {
1016         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1017 #ifdef CONFIG_CIFS_SMB2
1018         /*
1019          * SMB2 maximum header size is bigger than CIFS one - no problems to
1020          * allocate some more bytes for CIFS.
1021          */
1022         max_hdr_size = MAX_SMB2_HDR_SIZE;
1023 #endif
1024         if (CIFSMaxBufSize < 8192) {
1025         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1026         Unicode path name has to fit in any SMB/CIFS path based frames */
1027                 CIFSMaxBufSize = 8192;
1028         } else if (CIFSMaxBufSize > 1024*127) {
1029                 CIFSMaxBufSize = 1024 * 127;
1030         } else {
1031                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1032         }
1033 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
1034         cifs_req_cachep = kmem_cache_create("cifs_request",
1035                                             CIFSMaxBufSize + max_hdr_size, 0,
1036                                             SLAB_HWCACHE_ALIGN, NULL);
1037         if (cifs_req_cachep == NULL)
1038                 return -ENOMEM;
1039
1040         if (cifs_min_rcv < 1)
1041                 cifs_min_rcv = 1;
1042         else if (cifs_min_rcv > 64) {
1043                 cifs_min_rcv = 64;
1044                 cERROR(1, "cifs_min_rcv set to maximum (64)");
1045         }
1046
1047         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1048                                                   cifs_req_cachep);
1049
1050         if (cifs_req_poolp == NULL) {
1051                 kmem_cache_destroy(cifs_req_cachep);
1052                 return -ENOMEM;
1053         }
1054         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1055         almost all handle based requests (but not write response, nor is it
1056         sufficient for path based requests).  A smaller size would have
1057         been more efficient (compacting multiple slab items on one 4k page)
1058         for the case in which debug was on, but this larger size allows
1059         more SMBs to use small buffer alloc and is still much more
1060         efficient to alloc 1 per page off the slab compared to 17K (5page)
1061         alloc of large cifs buffers even when page debugging is on */
1062         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1063                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1064                         NULL);
1065         if (cifs_sm_req_cachep == NULL) {
1066                 mempool_destroy(cifs_req_poolp);
1067                 kmem_cache_destroy(cifs_req_cachep);
1068                 return -ENOMEM;
1069         }
1070
1071         if (cifs_min_small < 2)
1072                 cifs_min_small = 2;
1073         else if (cifs_min_small > 256) {
1074                 cifs_min_small = 256;
1075                 cFYI(1, "cifs_min_small set to maximum (256)");
1076         }
1077
1078         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1079                                                      cifs_sm_req_cachep);
1080
1081         if (cifs_sm_req_poolp == NULL) {
1082                 mempool_destroy(cifs_req_poolp);
1083                 kmem_cache_destroy(cifs_req_cachep);
1084                 kmem_cache_destroy(cifs_sm_req_cachep);
1085                 return -ENOMEM;
1086         }
1087
1088         return 0;
1089 }
1090
1091 static void
1092 cifs_destroy_request_bufs(void)
1093 {
1094         mempool_destroy(cifs_req_poolp);
1095         kmem_cache_destroy(cifs_req_cachep);
1096         mempool_destroy(cifs_sm_req_poolp);
1097         kmem_cache_destroy(cifs_sm_req_cachep);
1098 }
1099
1100 static int
1101 cifs_init_mids(void)
1102 {
1103         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1104                                             sizeof(struct mid_q_entry), 0,
1105                                             SLAB_HWCACHE_ALIGN, NULL);
1106         if (cifs_mid_cachep == NULL)
1107                 return -ENOMEM;
1108
1109         /* 3 is a reasonable minimum number of simultaneous operations */
1110         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1111         if (cifs_mid_poolp == NULL) {
1112                 kmem_cache_destroy(cifs_mid_cachep);
1113                 return -ENOMEM;
1114         }
1115
1116         return 0;
1117 }
1118
1119 static void
1120 cifs_destroy_mids(void)
1121 {
1122         mempool_destroy(cifs_mid_poolp);
1123         kmem_cache_destroy(cifs_mid_cachep);
1124 }
1125
1126 static int __init
1127 init_cifs(void)
1128 {
1129         int rc = 0;
1130         cifs_proc_init();
1131         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1132 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1133         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1134         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1135 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1136 /*
1137  *  Initialize Global counters
1138  */
1139         atomic_set(&sesInfoAllocCount, 0);
1140         atomic_set(&tconInfoAllocCount, 0);
1141         atomic_set(&tcpSesAllocCount, 0);
1142         atomic_set(&tcpSesReconnectCount, 0);
1143         atomic_set(&tconInfoReconnectCount, 0);
1144
1145         atomic_set(&bufAllocCount, 0);
1146         atomic_set(&smBufAllocCount, 0);
1147 #ifdef CONFIG_CIFS_STATS2
1148         atomic_set(&totBufAllocCount, 0);
1149         atomic_set(&totSmBufAllocCount, 0);
1150 #endif /* CONFIG_CIFS_STATS2 */
1151
1152         atomic_set(&midCount, 0);
1153         GlobalCurrentXid = 0;
1154         GlobalTotalActiveXid = 0;
1155         GlobalMaxActiveXid = 0;
1156         spin_lock_init(&cifs_tcp_ses_lock);
1157         spin_lock_init(&cifs_file_list_lock);
1158         spin_lock_init(&GlobalMid_Lock);
1159
1160 #ifdef CONFIG_CIFS_SMB2
1161         get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1162 #endif
1163
1164         if (cifs_max_pending < 2) {
1165                 cifs_max_pending = 2;
1166                 cFYI(1, "cifs_max_pending set to min of 2");
1167         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1168                 cifs_max_pending = CIFS_MAX_REQ;
1169                 cFYI(1, "cifs_max_pending set to max of %u", CIFS_MAX_REQ);
1170         }
1171
1172         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1173         if (!cifsiod_wq) {
1174                 rc = -ENOMEM;
1175                 goto out_clean_proc;
1176         }
1177
1178         rc = cifs_fscache_register();
1179         if (rc)
1180                 goto out_destroy_wq;
1181
1182         rc = cifs_init_inodecache();
1183         if (rc)
1184                 goto out_unreg_fscache;
1185
1186         rc = cifs_init_mids();
1187         if (rc)
1188                 goto out_destroy_inodecache;
1189
1190         rc = cifs_init_request_bufs();
1191         if (rc)
1192                 goto out_destroy_mids;
1193
1194 #ifdef CONFIG_CIFS_UPCALL
1195         rc = register_key_type(&cifs_spnego_key_type);
1196         if (rc)
1197                 goto out_destroy_request_bufs;
1198 #endif /* CONFIG_CIFS_UPCALL */
1199
1200 #ifdef CONFIG_CIFS_ACL
1201         rc = init_cifs_idmap();
1202         if (rc)
1203                 goto out_register_key_type;
1204 #endif /* CONFIG_CIFS_ACL */
1205
1206         rc = register_filesystem(&cifs_fs_type);
1207         if (rc)
1208                 goto out_init_cifs_idmap;
1209
1210         return 0;
1211
1212 out_init_cifs_idmap:
1213 #ifdef CONFIG_CIFS_ACL
1214         exit_cifs_idmap();
1215 out_register_key_type:
1216 #endif
1217 #ifdef CONFIG_CIFS_UPCALL
1218         unregister_key_type(&cifs_spnego_key_type);
1219 out_destroy_request_bufs:
1220 #endif
1221         cifs_destroy_request_bufs();
1222 out_destroy_mids:
1223         cifs_destroy_mids();
1224 out_destroy_inodecache:
1225         cifs_destroy_inodecache();
1226 out_unreg_fscache:
1227         cifs_fscache_unregister();
1228 out_destroy_wq:
1229         destroy_workqueue(cifsiod_wq);
1230 out_clean_proc:
1231         cifs_proc_clean();
1232         return rc;
1233 }
1234
1235 static void __exit
1236 exit_cifs(void)
1237 {
1238         cFYI(DBG2, "exit_cifs");
1239         unregister_filesystem(&cifs_fs_type);
1240         cifs_dfs_release_automount_timer();
1241 #ifdef CONFIG_CIFS_ACL
1242         exit_cifs_idmap();
1243 #endif
1244 #ifdef CONFIG_CIFS_UPCALL
1245         unregister_key_type(&cifs_spnego_key_type);
1246 #endif
1247         cifs_destroy_request_bufs();
1248         cifs_destroy_mids();
1249         cifs_destroy_inodecache();
1250         cifs_fscache_unregister();
1251         destroy_workqueue(cifsiod_wq);
1252         cifs_proc_clean();
1253 }
1254
1255 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1256 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1257 MODULE_DESCRIPTION
1258     ("VFS to access servers complying with the SNIA CIFS Specification "
1259      "e.g. Samba and Windows");
1260 MODULE_VERSION(CIFS_VERSION);
1261 module_init(init_cifs)
1262 module_exit(exit_cifs)