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                 cifs_dbg(FYI, "export ops supported\n");
 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         cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
 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         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 376                 seq_printf(s, ",multiuser");
 377         else if (tcon->ses->user_name)
 378                 seq_printf(s, ",username=%s", tcon->ses->user_name);
 379
 380         if (tcon->ses->domainName)
 381                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 382
 383         if (srcaddr->sa_family != AF_UNSPEC) {
 384                 struct sockaddr_in *saddr4;
 385                 struct sockaddr_in6 *saddr6;
 386                 saddr4 = (struct sockaddr_in *)srcaddr;
 387                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 388                 if (srcaddr->sa_family == AF_INET6)
 389                         seq_printf(s, ",srcaddr=%pI6c",
 390                                    &saddr6->sin6_addr);
 391                 else if (srcaddr->sa_family == AF_INET)
 392                         seq_printf(s, ",srcaddr=%pI4",
 393                                    &saddr4->sin_addr.s_addr);
 394                 else
 395                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 396                                    (int)(srcaddr->sa_family));
 397         }
 398
 399         seq_printf(s, ",uid=%u",
 400                    from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
 401         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 402                 seq_printf(s, ",forceuid");
 403         else
 404                 seq_printf(s, ",noforceuid");
 405
 406         seq_printf(s, ",gid=%u",
 407                    from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
 408         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 409                 seq_printf(s, ",forcegid");
 410         else
 411                 seq_printf(s, ",noforcegid");
 412
 413         cifs_show_address(s, tcon->ses->server);
 414
 415         if (!tcon->unix_ext)
 416                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 417                                            cifs_sb->mnt_file_mode,
 418                                            cifs_sb->mnt_dir_mode);
 419         if (tcon->seal)
 420                 seq_printf(s, ",seal");
 421         if (tcon->nocase)
 422                 seq_printf(s, ",nocase");
 423         if (tcon->retry)
 424                 seq_printf(s, ",hard");
 425         if (tcon->unix_ext)
 426                 seq_printf(s, ",unix");
 427         else
 428                 seq_printf(s, ",nounix");
 429         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 430                 seq_printf(s, ",posixpaths");
 431         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 432                 seq_printf(s, ",setuids");
 433         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 434                 seq_printf(s, ",serverino");
 435         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 436                 seq_printf(s, ",rwpidforward");
 437         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 438                 seq_printf(s, ",forcemand");
 439         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 440                 seq_printf(s, ",nouser_xattr");
 441         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 442                 seq_printf(s, ",mapchars");
 443         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 444                 seq_printf(s, ",sfu");
 445         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 446                 seq_printf(s, ",nobrl");
 447         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 448                 seq_printf(s, ",cifsacl");
 449         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 450                 seq_printf(s, ",dynperm");
 451         if (root->d_sb->s_flags & MS_POSIXACL)
 452                 seq_printf(s, ",acl");
 453         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 454                 seq_printf(s, ",mfsymlinks");
 455         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 456                 seq_printf(s, ",fsc");
 457         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 458                 seq_printf(s, ",nostrictsync");
 459         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 460                 seq_printf(s, ",noperm");
 461         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 462                 seq_printf(s, ",backupuid=%u",
 463                            from_kuid_munged(&init_user_ns,
 464                                             cifs_sb->mnt_backupuid));
 465         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 466                 seq_printf(s, ",backupgid=%u",
 467                            from_kgid_munged(&init_user_ns,
 468                                             cifs_sb->mnt_backupgid));
 469
 470         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 471         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 472         /* convert actimeo and display it in seconds */
 473         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 474
 475         return 0;
 476 }
 477
 478 static void cifs_umount_begin(struct super_block *sb)
 479 {
 480         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 481         struct cifs_tcon *tcon;
 482
 483         if (cifs_sb == NULL)
 484                 return;
 485
 486         tcon = cifs_sb_master_tcon(cifs_sb);
 487
 488         spin_lock(&cifs_tcp_ses_lock);
 489         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 490                 /* we have other mounts to same share or we have
 491                    already tried to force umount this and woken up
 492                    all waiting network requests, nothing to do */
 493                 spin_unlock(&cifs_tcp_ses_lock);
 494                 return;
 495         } else if (tcon->tc_count == 1)
 496                 tcon->tidStatus = CifsExiting;
 497         spin_unlock(&cifs_tcp_ses_lock);
 498
 499         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 500         /* cancel_notify_requests(tcon); */
 501         if (tcon->ses && tcon->ses->server) {
 502                 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
 503                 wake_up_all(&tcon->ses->server->request_q);
 504                 wake_up_all(&tcon->ses->server->response_q);
 505                 msleep(1); /* yield */
 506                 /* we have to kick the requests once more */
 507                 wake_up_all(&tcon->ses->server->response_q);
 508                 msleep(1);
 509         }
 510
 511         return;
 512 }
 513
 514 #ifdef CONFIG_CIFS_STATS2
 515 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 516 {
 517         /* BB FIXME */
 518         return 0;
 519 }
 520 #endif
 521
 522 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 523 {
 524         *flags |= MS_NODIRATIME;
 525         return 0;
 526 }
 527
 528 static int cifs_drop_inode(struct inode *inode)
 529 {
 530         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 531
 532         /* no serverino => unconditional eviction */
 533         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 534                 generic_drop_inode(inode);
 535 }
 536
 537 static const struct super_operations cifs_super_ops = {
 538         .statfs = cifs_statfs,
 539         .alloc_inode = cifs_alloc_inode,
 540         .destroy_inode = cifs_destroy_inode,
 541         .drop_inode     = cifs_drop_inode,
 542         .evict_inode    = cifs_evict_inode,
 543 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 544         function unless later we add lazy close of inodes or unless the
 545         kernel forgets to call us with the same number of releases (closes)
 546         as opens */
 547         .show_options = cifs_show_options,
 548         .umount_begin   = cifs_umount_begin,
 549         .remount_fs = cifs_remount,
 550 #ifdef CONFIG_CIFS_STATS2
 551         .show_stats = cifs_show_stats,
 552 #endif
 553 };
 554
 555 /*
 556  * Get root dentry from superblock according to prefix path mount option.
 557  * Return dentry with refcount + 1 on success and NULL otherwise.
 558  */
 559 static struct dentry *
 560 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 561 {
 562         struct dentry *dentry;
 563         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 564         char *full_path = NULL;
 565         char *s, *p;
 566         char sep;
 567
 568         full_path = cifs_build_path_to_root(vol, cifs_sb,
 569                                             cifs_sb_master_tcon(cifs_sb));
 570         if (full_path == NULL)
 571                 return ERR_PTR(-ENOMEM);
 572
 573         cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
 574
 575         sep = CIFS_DIR_SEP(cifs_sb);
 576         dentry = dget(sb->s_root);
 577         p = s = full_path;
 578
 579         do {
 580                 struct inode *dir = dentry->d_inode;
 581                 struct dentry *child;
 582
 583                 if (!dir) {
 584                         dput(dentry);
 585                         dentry = ERR_PTR(-ENOENT);
 586                         break;
 587                 }
 588                 if (!S_ISDIR(dir->i_mode)) {
 589                         dput(dentry);
 590                         dentry = ERR_PTR(-ENOTDIR);
 591                         break;
 592                 }
 593
 594                 /* skip separators */
 595                 while (*s == sep)
 596                         s++;
 597                 if (!*s)
 598                         break;
 599                 p = s++;
 600                 /* next separator */
 601                 while (*s && *s != sep)
 602                         s++;
 603
 604                 mutex_lock(&dir->i_mutex);
 605                 child = lookup_one_len(p, dentry, s - p);
 606                 mutex_unlock(&dir->i_mutex);
 607                 dput(dentry);
 608                 dentry = child;
 609         } while (!IS_ERR(dentry));
 610         kfree(full_path);
 611         return dentry;
 612 }
 613
 614 static int cifs_set_super(struct super_block *sb, void *data)
 615 {
 616         struct cifs_mnt_data *mnt_data = data;
 617         sb->s_fs_info = mnt_data->cifs_sb;
 618         return set_anon_super(sb, NULL);
 619 }
 620
 621 static struct dentry *
 622 cifs_do_mount(struct file_system_type *fs_type,
 623               int flags, const char *dev_name, void *data)
 624 {
 625         int rc;
 626         struct super_block *sb;
 627         struct cifs_sb_info *cifs_sb;
 628         struct smb_vol *volume_info;
 629         struct cifs_mnt_data mnt_data;
 630         struct dentry *root;
 631
 632         cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
 633
 634         volume_info = cifs_get_volume_info((char *)data, dev_name);
 635         if (IS_ERR(volume_info))
 636                 return ERR_CAST(volume_info);
 637
 638         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 639         if (cifs_sb == NULL) {
 640                 root = ERR_PTR(-ENOMEM);
 641                 goto out_nls;
 642         }
 643
 644         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 645         if (cifs_sb->mountdata == NULL) {
 646                 root = ERR_PTR(-ENOMEM);
 647                 goto out_cifs_sb;
 648         }
 649
 650         cifs_setup_cifs_sb(volume_info, cifs_sb);
 651
 652         rc = cifs_mount(cifs_sb, volume_info);
 653         if (rc) {
 654                 if (!(flags & MS_SILENT))
 655                         cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
 656                                  rc);
 657                 root = ERR_PTR(rc);
 658                 goto out_mountdata;
 659         }
 660
 661         mnt_data.vol = volume_info;
 662         mnt_data.cifs_sb = cifs_sb;
 663         mnt_data.flags = flags;
 664
 665         /* BB should we make this contingent on mount parm? */
 666         flags |= MS_NODIRATIME | MS_NOATIME;
 667
 668         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 669         if (IS_ERR(sb)) {
 670                 root = ERR_CAST(sb);
 671                 cifs_umount(cifs_sb);
 672                 goto out;
 673         }
 674
 675         if (sb->s_root) {
 676                 cifs_dbg(FYI, "Use existing superblock\n");
 677                 cifs_umount(cifs_sb);
 678         } else {
 679                 rc = cifs_read_super(sb);
 680                 if (rc) {
 681                         root = ERR_PTR(rc);
 682                         goto out_super;
 683                 }
 684
 685                 sb->s_flags |= MS_ACTIVE;
 686         }
 687
 688         root = cifs_get_root(volume_info, sb);
 689         if (IS_ERR(root))
 690                 goto out_super;
 691
 692         cifs_dbg(FYI, "dentry root is: %p\n", root);
 693         goto out;
 694
 695 out_super:
 696         deactivate_locked_super(sb);
 697 out:
 698         cifs_cleanup_volume_info(volume_info);
 699         return root;
 700
 701 out_mountdata:
 702         kfree(cifs_sb->mountdata);
 703 out_cifs_sb:
 704         kfree(cifs_sb);
 705 out_nls:
 706         unload_nls(volume_info->local_nls);
 707         goto out;
 708 }
 709
 710 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 711                                    unsigned long nr_segs, loff_t pos)
 712 {
 713         struct inode *inode = file_inode(iocb->ki_filp);
 714         ssize_t written;
 715         int rc;
 716
 717         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 718
 719         if (CIFS_I(inode)->clientCanCacheAll)
 720                 return written;
 721
 722         rc = filemap_fdatawrite(inode->i_mapping);
 723         if (rc)
 724                 cifs_dbg(FYI, "cifs_file_aio_write: %d rc on %p inode\n",
 725                          rc, inode);
 726
 727         return written;
 728 }
 729
 730 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
 731 {
 732         /*
 733          * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 734          * the cached file length
 735          */
 736         if (whence != SEEK_SET && whence != SEEK_CUR) {
 737                 int rc;
 738                 struct inode *inode = file_inode(file);
 739
 740                 /*
 741                  * We need to be sure that all dirty pages are written and the
 742                  * server has the newest file length.
 743                  */
 744                 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
 745                     inode->i_mapping->nrpages != 0) {
 746                         rc = filemap_fdatawait(inode->i_mapping);
 747                         if (rc) {
 748                                 mapping_set_error(inode->i_mapping, rc);
 749                                 return rc;
 750                         }
 751                 }
 752                 /*
 753                  * Some applications poll for the file length in this strange
 754                  * way so we must seek to end on non-oplocked files by
 755                  * setting the revalidate time to zero.
 756                  */
 757                 CIFS_I(inode)->time = 0;
 758
 759                 rc = cifs_revalidate_file_attr(file);
 760                 if (rc < 0)
 761                         return (loff_t)rc;
 762         }
 763         return generic_file_llseek(file, offset, whence);
 764 }
 765
 766 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 767 {
 768         /* note that this is called by vfs setlease with lock_flocks held
 769            to protect *lease from going away */
 770         struct inode *inode = file_inode(file);
 771         struct cifsFileInfo *cfile = file->private_data;
 772
 773         if (!(S_ISREG(inode->i_mode)))
 774                 return -EINVAL;
 775
 776         /* check if file is oplocked */
 777         if (((arg == F_RDLCK) &&
 778                 (CIFS_I(inode)->clientCanCacheRead)) ||
 779             ((arg == F_WRLCK) &&
 780                 (CIFS_I(inode)->clientCanCacheAll)))
 781                 return generic_setlease(file, arg, lease);
 782         else if (tlink_tcon(cfile->tlink)->local_lease &&
 783                  !CIFS_I(inode)->clientCanCacheRead)
 784                 /* If the server claims to support oplock on this
 785                    file, then we still need to check oplock even
 786                    if the local_lease mount option is set, but there
 787                    are servers which do not support oplock for which
 788                    this mount option may be useful if the user
 789                    knows that the file won't be changed on the server
 790                    by anyone else */
 791                 return generic_setlease(file, arg, lease);
 792         else
 793                 return -EAGAIN;
 794 }
 795
 796 struct file_system_type cifs_fs_type = {
 797         .owner = THIS_MODULE,
 798         .name = "cifs",
 799         .mount = cifs_do_mount,
 800         .kill_sb = cifs_kill_sb,
 801         /*  .fs_flags */
 802 };
 803 MODULE_ALIAS_FS("cifs");
 804 const struct inode_operations cifs_dir_inode_ops = {
 805         .create = cifs_create,
 806         .atomic_open = cifs_atomic_open,
 807         .lookup = cifs_lookup,
 808         .getattr = cifs_getattr,
 809         .unlink = cifs_unlink,
 810         .link = cifs_hardlink,
 811         .mkdir = cifs_mkdir,
 812         .rmdir = cifs_rmdir,
 813         .rename = cifs_rename,
 814         .permission = cifs_permission,
 815 /*      revalidate:cifs_revalidate,   */
 816         .setattr = cifs_setattr,
 817         .symlink = cifs_symlink,
 818         .mknod   = cifs_mknod,
 819 #ifdef CONFIG_CIFS_XATTR
 820         .setxattr = cifs_setxattr,
 821         .getxattr = cifs_getxattr,
 822         .listxattr = cifs_listxattr,
 823         .removexattr = cifs_removexattr,
 824 #endif
 825 };
 826
 827 const struct inode_operations cifs_file_inode_ops = {
 828 /*      revalidate:cifs_revalidate, */
 829         .setattr = cifs_setattr,
 830         .getattr = cifs_getattr, /* do we need this anymore? */
 831         .rename = cifs_rename,
 832         .permission = cifs_permission,
 833 #ifdef CONFIG_CIFS_XATTR
 834         .setxattr = cifs_setxattr,
 835         .getxattr = cifs_getxattr,
 836         .listxattr = cifs_listxattr,
 837         .removexattr = cifs_removexattr,
 838 #endif
 839 };
 840
 841 const struct inode_operations cifs_symlink_inode_ops = {
 842         .readlink = generic_readlink,
 843         .follow_link = cifs_follow_link,
 844         .put_link = cifs_put_link,
 845         .permission = cifs_permission,
 846         /* BB add the following two eventually */
 847         /* revalidate: cifs_revalidate,
 848            setattr:    cifs_notify_change, *//* BB do we need notify change */
 849 #ifdef CONFIG_CIFS_XATTR
 850         .setxattr = cifs_setxattr,
 851         .getxattr = cifs_getxattr,
 852         .listxattr = cifs_listxattr,
 853         .removexattr = cifs_removexattr,
 854 #endif
 855 };
 856
 857 const struct file_operations cifs_file_ops = {
 858         .read = do_sync_read,
 859         .write = do_sync_write,
 860         .aio_read = generic_file_aio_read,
 861         .aio_write = cifs_file_aio_write,
 862         .open = cifs_open,
 863         .release = cifs_close,
 864         .lock = cifs_lock,
 865         .fsync = cifs_fsync,
 866         .flush = cifs_flush,
 867         .mmap  = cifs_file_mmap,
 868         .splice_read = generic_file_splice_read,
 869         .llseek = cifs_llseek,
 870 #ifdef CONFIG_CIFS_POSIX
 871         .unlocked_ioctl = cifs_ioctl,
 872 #endif /* CONFIG_CIFS_POSIX */
 873         .setlease = cifs_setlease,
 874 };
 875
 876 const struct file_operations cifs_file_strict_ops = {
 877         .read = do_sync_read,
 878         .write = do_sync_write,
 879         .aio_read = cifs_strict_readv,
 880         .aio_write = cifs_strict_writev,
 881         .open = cifs_open,
 882         .release = cifs_close,
 883         .lock = cifs_lock,
 884         .fsync = cifs_strict_fsync,
 885         .flush = cifs_flush,
 886         .mmap = cifs_file_strict_mmap,
 887         .splice_read = generic_file_splice_read,
 888         .llseek = cifs_llseek,
 889 #ifdef CONFIG_CIFS_POSIX
 890         .unlocked_ioctl = cifs_ioctl,
 891 #endif /* CONFIG_CIFS_POSIX */
 892         .setlease = cifs_setlease,
 893 };
 894
 895 const struct file_operations cifs_file_direct_ops = {
 896         /* BB reevaluate whether they can be done with directio, no cache */
 897         .read = do_sync_read,
 898         .write = do_sync_write,
 899         .aio_read = cifs_user_readv,
 900         .aio_write = cifs_user_writev,
 901         .open = cifs_open,
 902         .release = cifs_close,
 903         .lock = cifs_lock,
 904         .fsync = cifs_fsync,
 905         .flush = cifs_flush,
 906         .mmap = cifs_file_mmap,
 907         .splice_read = generic_file_splice_read,
 908 #ifdef CONFIG_CIFS_POSIX
 909         .unlocked_ioctl  = cifs_ioctl,
 910 #endif /* CONFIG_CIFS_POSIX */
 911         .llseek = cifs_llseek,
 912         .setlease = cifs_setlease,
 913 };
 914
 915 const struct file_operations cifs_file_nobrl_ops = {
 916         .read = do_sync_read,
 917         .write = do_sync_write,
 918         .aio_read = generic_file_aio_read,
 919         .aio_write = cifs_file_aio_write,
 920         .open = cifs_open,
 921         .release = cifs_close,
 922         .fsync = cifs_fsync,
 923         .flush = cifs_flush,
 924         .mmap  = cifs_file_mmap,
 925         .splice_read = generic_file_splice_read,
 926         .llseek = cifs_llseek,
 927 #ifdef CONFIG_CIFS_POSIX
 928         .unlocked_ioctl = cifs_ioctl,
 929 #endif /* CONFIG_CIFS_POSIX */
 930         .setlease = cifs_setlease,
 931 };
 932
 933 const struct file_operations cifs_file_strict_nobrl_ops = {
 934         .read = do_sync_read,
 935         .write = do_sync_write,
 936         .aio_read = cifs_strict_readv,
 937         .aio_write = cifs_strict_writev,
 938         .open = cifs_open,
 939         .release = cifs_close,
 940         .fsync = cifs_strict_fsync,
 941         .flush = cifs_flush,
 942         .mmap = cifs_file_strict_mmap,
 943         .splice_read = generic_file_splice_read,
 944         .llseek = cifs_llseek,
 945 #ifdef CONFIG_CIFS_POSIX
 946         .unlocked_ioctl = cifs_ioctl,
 947 #endif /* CONFIG_CIFS_POSIX */
 948         .setlease = cifs_setlease,
 949 };
 950
 951 const struct file_operations cifs_file_direct_nobrl_ops = {
 952         /* BB reevaluate whether they can be done with directio, no cache */
 953         .read = do_sync_read,
 954         .write = do_sync_write,
 955         .aio_read = cifs_user_readv,
 956         .aio_write = cifs_user_writev,
 957         .open = cifs_open,
 958         .release = cifs_close,
 959         .fsync = cifs_fsync,
 960         .flush = cifs_flush,
 961         .mmap = cifs_file_mmap,
 962         .splice_read = generic_file_splice_read,
 963 #ifdef CONFIG_CIFS_POSIX
 964         .unlocked_ioctl  = cifs_ioctl,
 965 #endif /* CONFIG_CIFS_POSIX */
 966         .llseek = cifs_llseek,
 967         .setlease = cifs_setlease,
 968 };
 969
 970 const struct file_operations cifs_dir_ops = {
 971         .iterate = cifs_readdir,
 972         .release = cifs_closedir,
 973         .read    = generic_read_dir,
 974         .unlocked_ioctl  = cifs_ioctl,
 975         .llseek = generic_file_llseek,
 976 };
 977
 978 static void
 979 cifs_init_once(void *inode)
 980 {
 981         struct cifsInodeInfo *cifsi = inode;
 982
 983         inode_init_once(&cifsi->vfs_inode);
 984         init_rwsem(&cifsi->lock_sem);
 985 }
 986
 987 static int
 988 cifs_init_inodecache(void)
 989 {
 990         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 991                                               sizeof(struct cifsInodeInfo),
 992                                               0, (SLAB_RECLAIM_ACCOUNT|
 993                                                 SLAB_MEM_SPREAD),
 994                                               cifs_init_once);
 995         if (cifs_inode_cachep == NULL)
 996                 return -ENOMEM;
 997
 998         return 0;
 999 }
1000
1001 static void
1002 cifs_destroy_inodecache(void)
1003 {
1004         /*
1005          * Make sure all delayed rcu free inodes are flushed before we
1006          * destroy cache.
1007          */
1008         rcu_barrier();
1009         kmem_cache_destroy(cifs_inode_cachep);
1010 }
1011
1012 static int
1013 cifs_init_request_bufs(void)
1014 {
1015         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1016 #ifdef CONFIG_CIFS_SMB2
1017         /*
1018          * SMB2 maximum header size is bigger than CIFS one - no problems to
1019          * allocate some more bytes for CIFS.
1020          */
1021         max_hdr_size = MAX_SMB2_HDR_SIZE;
1022 #endif
1023         if (CIFSMaxBufSize < 8192) {
1024         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1025         Unicode path name has to fit in any SMB/CIFS path based frames */
1026                 CIFSMaxBufSize = 8192;
1027         } else if (CIFSMaxBufSize > 1024*127) {
1028                 CIFSMaxBufSize = 1024 * 127;
1029         } else {
1030                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1031         }
1032 /*
1033         cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1034                  CIFSMaxBufSize, CIFSMaxBufSize);
1035 */
1036         cifs_req_cachep = kmem_cache_create("cifs_request",
1037                                             CIFSMaxBufSize + max_hdr_size, 0,
1038                                             SLAB_HWCACHE_ALIGN, NULL);
1039         if (cifs_req_cachep == NULL)
1040                 return -ENOMEM;
1041
1042         if (cifs_min_rcv < 1)
1043                 cifs_min_rcv = 1;
1044         else if (cifs_min_rcv > 64) {
1045                 cifs_min_rcv = 64;
1046                 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1047         }
1048
1049         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1050                                                   cifs_req_cachep);
1051
1052         if (cifs_req_poolp == NULL) {
1053                 kmem_cache_destroy(cifs_req_cachep);
1054                 return -ENOMEM;
1055         }
1056         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1057         almost all handle based requests (but not write response, nor is it
1058         sufficient for path based requests).  A smaller size would have
1059         been more efficient (compacting multiple slab items on one 4k page)
1060         for the case in which debug was on, but this larger size allows
1061         more SMBs to use small buffer alloc and is still much more
1062         efficient to alloc 1 per page off the slab compared to 17K (5page)
1063         alloc of large cifs buffers even when page debugging is on */
1064         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1065                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1066                         NULL);
1067         if (cifs_sm_req_cachep == NULL) {
1068                 mempool_destroy(cifs_req_poolp);
1069                 kmem_cache_destroy(cifs_req_cachep);
1070                 return -ENOMEM;
1071         }
1072
1073         if (cifs_min_small < 2)
1074                 cifs_min_small = 2;
1075         else if (cifs_min_small > 256) {
1076                 cifs_min_small = 256;
1077                 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1078         }
1079
1080         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1081                                                      cifs_sm_req_cachep);
1082
1083         if (cifs_sm_req_poolp == NULL) {
1084                 mempool_destroy(cifs_req_poolp);
1085                 kmem_cache_destroy(cifs_req_cachep);
1086                 kmem_cache_destroy(cifs_sm_req_cachep);
1087                 return -ENOMEM;
1088         }
1089
1090         return 0;
1091 }
1092
1093 static void
1094 cifs_destroy_request_bufs(void)
1095 {
1096         mempool_destroy(cifs_req_poolp);
1097         kmem_cache_destroy(cifs_req_cachep);
1098         mempool_destroy(cifs_sm_req_poolp);
1099         kmem_cache_destroy(cifs_sm_req_cachep);
1100 }
1101
1102 static int
1103 cifs_init_mids(void)
1104 {
1105         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1106                                             sizeof(struct mid_q_entry), 0,
1107                                             SLAB_HWCACHE_ALIGN, NULL);
1108         if (cifs_mid_cachep == NULL)
1109                 return -ENOMEM;
1110
1111         /* 3 is a reasonable minimum number of simultaneous operations */
1112         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1113         if (cifs_mid_poolp == NULL) {
1114                 kmem_cache_destroy(cifs_mid_cachep);
1115                 return -ENOMEM;
1116         }
1117
1118         return 0;
1119 }
1120
1121 static void
1122 cifs_destroy_mids(void)
1123 {
1124         mempool_destroy(cifs_mid_poolp);
1125         kmem_cache_destroy(cifs_mid_cachep);
1126 }
1127
1128 static int __init
1129 init_cifs(void)
1130 {
1131         int rc = 0;
1132         cifs_proc_init();
1133         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1134 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1135         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1136         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1137 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1138 /*
1139  *  Initialize Global counters
1140  */
1141         atomic_set(&sesInfoAllocCount, 0);
1142         atomic_set(&tconInfoAllocCount, 0);
1143         atomic_set(&tcpSesAllocCount, 0);
1144         atomic_set(&tcpSesReconnectCount, 0);
1145         atomic_set(&tconInfoReconnectCount, 0);
1146
1147         atomic_set(&bufAllocCount, 0);
1148         atomic_set(&smBufAllocCount, 0);
1149 #ifdef CONFIG_CIFS_STATS2
1150         atomic_set(&totBufAllocCount, 0);
1151         atomic_set(&totSmBufAllocCount, 0);
1152 #endif /* CONFIG_CIFS_STATS2 */
1153
1154         atomic_set(&midCount, 0);
1155         GlobalCurrentXid = 0;
1156         GlobalTotalActiveXid = 0;
1157         GlobalMaxActiveXid = 0;
1158         spin_lock_init(&cifs_tcp_ses_lock);
1159         spin_lock_init(&cifs_file_list_lock);
1160         spin_lock_init(&GlobalMid_Lock);
1161
1162 #ifdef CONFIG_CIFS_SMB2
1163         get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1164 #endif
1165
1166         if (cifs_max_pending < 2) {
1167                 cifs_max_pending = 2;
1168                 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1169         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1170                 cifs_max_pending = CIFS_MAX_REQ;
1171                 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1172                          CIFS_MAX_REQ);
1173         }
1174
1175         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1176         if (!cifsiod_wq) {
1177                 rc = -ENOMEM;
1178                 goto out_clean_proc;
1179         }
1180
1181         rc = cifs_fscache_register();
1182         if (rc)
1183                 goto out_destroy_wq;
1184
1185         rc = cifs_init_inodecache();
1186         if (rc)
1187                 goto out_unreg_fscache;
1188
1189         rc = cifs_init_mids();
1190         if (rc)
1191                 goto out_destroy_inodecache;
1192
1193         rc = cifs_init_request_bufs();
1194         if (rc)
1195                 goto out_destroy_mids;
1196
1197 #ifdef CONFIG_CIFS_UPCALL
1198         rc = register_key_type(&cifs_spnego_key_type);
1199         if (rc)
1200                 goto out_destroy_request_bufs;
1201 #endif /* CONFIG_CIFS_UPCALL */
1202
1203 #ifdef CONFIG_CIFS_ACL
1204         rc = init_cifs_idmap();
1205         if (rc)
1206                 goto out_register_key_type;
1207 #endif /* CONFIG_CIFS_ACL */
1208
1209         rc = register_filesystem(&cifs_fs_type);
1210         if (rc)
1211                 goto out_init_cifs_idmap;
1212
1213         return 0;
1214
1215 out_init_cifs_idmap:
1216 #ifdef CONFIG_CIFS_ACL
1217         exit_cifs_idmap();
1218 out_register_key_type:
1219 #endif
1220 #ifdef CONFIG_CIFS_UPCALL
1221         unregister_key_type(&cifs_spnego_key_type);
1222 out_destroy_request_bufs:
1223 #endif
1224         cifs_destroy_request_bufs();
1225 out_destroy_mids:
1226         cifs_destroy_mids();
1227 out_destroy_inodecache:
1228         cifs_destroy_inodecache();
1229 out_unreg_fscache:
1230         cifs_fscache_unregister();
1231 out_destroy_wq:
1232         destroy_workqueue(cifsiod_wq);
1233 out_clean_proc:
1234         cifs_proc_clean();
1235         return rc;
1236 }
1237
1238 static void __exit
1239 exit_cifs(void)
1240 {
1241         cifs_dbg(NOISY, "exit_cifs\n");
1242         unregister_filesystem(&cifs_fs_type);
1243         cifs_dfs_release_automount_timer();
1244 #ifdef CONFIG_CIFS_ACL
1245         exit_cifs_idmap();
1246 #endif
1247 #ifdef CONFIG_CIFS_UPCALL
1248         unregister_key_type(&cifs_spnego_key_type);
1249 #endif
1250         cifs_destroy_request_bufs();
1251         cifs_destroy_mids();
1252         cifs_destroy_inodecache();
1253         cifs_fscache_unregister();
1254         destroy_workqueue(cifsiod_wq);
1255         cifs_proc_clean();
1256 }
1257
1258 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1259 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1260 MODULE_DESCRIPTION
1261     ("VFS to access servers complying with the SNIA CIFS Specification "
1262      "e.g. Samba and Windows");
1263 MODULE_VERSION(CIFS_VERSION);
1264 module_init(init_cifs)
1265 module_exit(exit_cifs)