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         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                 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
 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         cifs_dbg(FYI, "Get root dentry for %s\n", 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         cifs_dbg(FYI, "Devname: %s flags: %d\n", 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                         cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
 659                                  rc);
 660                 root = ERR_PTR(rc);
 661                 goto out_mountdata;
 662         }
 663
 664         mnt_data.vol = volume_info;
 665         mnt_data.cifs_sb = cifs_sb;
 666         mnt_data.flags = flags;
 667
 668         /* BB should we make this contingent on mount parm? */
 669         flags |= MS_NODIRATIME | MS_NOATIME;
 670
 671         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 672         if (IS_ERR(sb)) {
 673                 root = ERR_CAST(sb);
 674                 cifs_umount(cifs_sb);
 675                 goto out;
 676         }
 677
 678         if (sb->s_root) {
 679                 cifs_dbg(FYI, "Use existing superblock\n");
 680                 cifs_umount(cifs_sb);
 681         } else {
 682                 rc = cifs_read_super(sb);
 683                 if (rc) {
 684                         root = ERR_PTR(rc);
 685                         goto out_super;
 686                 }
 687
 688                 sb->s_flags |= MS_ACTIVE;
 689         }
 690
 691         root = cifs_get_root(volume_info, sb);
 692         if (IS_ERR(root))
 693                 goto out_super;
 694
 695         cifs_dbg(FYI, "dentry root is: %p\n", root);
 696         goto out;
 697
 698 out_super:
 699         deactivate_locked_super(sb);
 700 out:
 701         cifs_cleanup_volume_info(volume_info);
 702         return root;
 703
 704 out_mountdata:
 705         kfree(cifs_sb->mountdata);
 706 out_cifs_sb:
 707         kfree(cifs_sb);
 708 out_nls:
 709         unload_nls(volume_info->local_nls);
 710         goto out;
 711 }
 712
 713 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 714                                    unsigned long nr_segs, loff_t pos)
 715 {
 716         struct inode *inode = file_inode(iocb->ki_filp);
 717         ssize_t written;
 718         int rc;
 719
 720         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 721
 722         if (CIFS_I(inode)->clientCanCacheAll)
 723                 return written;
 724
 725         rc = filemap_fdatawrite(inode->i_mapping);
 726         if (rc)
 727                 cifs_dbg(FYI, "cifs_file_aio_write: %d rc on %p inode\n",
 728                          rc, inode);
 729
 730         return written;
 731 }
 732
 733 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
 734 {
 735         /*
 736          * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 737          * the cached file length
 738          */
 739         if (whence != SEEK_SET && whence != SEEK_CUR) {
 740                 int rc;
 741                 struct inode *inode = file_inode(file);
 742
 743                 /*
 744                  * We need to be sure that all dirty pages are written and the
 745                  * server has the newest file length.
 746                  */
 747                 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
 748                     inode->i_mapping->nrpages != 0) {
 749                         rc = filemap_fdatawait(inode->i_mapping);
 750                         if (rc) {
 751                                 mapping_set_error(inode->i_mapping, rc);
 752                                 return rc;
 753                         }
 754                 }
 755                 /*
 756                  * Some applications poll for the file length in this strange
 757                  * way so we must seek to end on non-oplocked files by
 758                  * setting the revalidate time to zero.
 759                  */
 760                 CIFS_I(inode)->time = 0;
 761
 762                 rc = cifs_revalidate_file_attr(file);
 763                 if (rc < 0)
 764                         return (loff_t)rc;
 765         }
 766         return generic_file_llseek(file, offset, whence);
 767 }
 768
 769 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 770 {
 771         /* note that this is called by vfs setlease with lock_flocks held
 772            to protect *lease from going away */
 773         struct inode *inode = file_inode(file);
 774         struct cifsFileInfo *cfile = file->private_data;
 775
 776         if (!(S_ISREG(inode->i_mode)))
 777                 return -EINVAL;
 778
 779         /* check if file is oplocked */
 780         if (((arg == F_RDLCK) &&
 781                 (CIFS_I(inode)->clientCanCacheRead)) ||
 782             ((arg == F_WRLCK) &&
 783                 (CIFS_I(inode)->clientCanCacheAll)))
 784                 return generic_setlease(file, arg, lease);
 785         else if (tlink_tcon(cfile->tlink)->local_lease &&
 786                  !CIFS_I(inode)->clientCanCacheRead)
 787                 /* If the server claims to support oplock on this
 788                    file, then we still need to check oplock even
 789                    if the local_lease mount option is set, but there
 790                    are servers which do not support oplock for which
 791                    this mount option may be useful if the user
 792                    knows that the file won't be changed on the server
 793                    by anyone else */
 794                 return generic_setlease(file, arg, lease);
 795         else
 796                 return -EAGAIN;
 797 }
 798
 799 struct file_system_type cifs_fs_type = {
 800         .owner = THIS_MODULE,
 801         .name = "cifs",
 802         .mount = cifs_do_mount,
 803         .kill_sb = cifs_kill_sb,
 804         /*  .fs_flags */
 805 };
 806 MODULE_ALIAS_FS("cifs");
 807 const struct inode_operations cifs_dir_inode_ops = {
 808         .create = cifs_create,
 809         .atomic_open = cifs_atomic_open,
 810         .lookup = cifs_lookup,
 811         .getattr = cifs_getattr,
 812         .unlink = cifs_unlink,
 813         .link = cifs_hardlink,
 814         .mkdir = cifs_mkdir,
 815         .rmdir = cifs_rmdir,
 816         .rename = cifs_rename,
 817         .permission = cifs_permission,
 818 /*      revalidate:cifs_revalidate,   */
 819         .setattr = cifs_setattr,
 820         .symlink = cifs_symlink,
 821         .mknod   = cifs_mknod,
 822 #ifdef CONFIG_CIFS_XATTR
 823         .setxattr = cifs_setxattr,
 824         .getxattr = cifs_getxattr,
 825         .listxattr = cifs_listxattr,
 826         .removexattr = cifs_removexattr,
 827 #endif
 828 };
 829
 830 const struct inode_operations cifs_file_inode_ops = {
 831 /*      revalidate:cifs_revalidate, */
 832         .setattr = cifs_setattr,
 833         .getattr = cifs_getattr, /* do we need this anymore? */
 834         .rename = cifs_rename,
 835         .permission = cifs_permission,
 836 #ifdef CONFIG_CIFS_XATTR
 837         .setxattr = cifs_setxattr,
 838         .getxattr = cifs_getxattr,
 839         .listxattr = cifs_listxattr,
 840         .removexattr = cifs_removexattr,
 841 #endif
 842 };
 843
 844 const struct inode_operations cifs_symlink_inode_ops = {
 845         .readlink = generic_readlink,
 846         .follow_link = cifs_follow_link,
 847         .put_link = cifs_put_link,
 848         .permission = cifs_permission,
 849         /* BB add the following two eventually */
 850         /* revalidate: cifs_revalidate,
 851            setattr:    cifs_notify_change, *//* BB do we need notify change */
 852 #ifdef CONFIG_CIFS_XATTR
 853         .setxattr = cifs_setxattr,
 854         .getxattr = cifs_getxattr,
 855         .listxattr = cifs_listxattr,
 856         .removexattr = cifs_removexattr,
 857 #endif
 858 };
 859
 860 const struct file_operations cifs_file_ops = {
 861         .read = do_sync_read,
 862         .write = do_sync_write,
 863         .aio_read = generic_file_aio_read,
 864         .aio_write = cifs_file_aio_write,
 865         .open = cifs_open,
 866         .release = cifs_close,
 867         .lock = cifs_lock,
 868         .fsync = cifs_fsync,
 869         .flush = cifs_flush,
 870         .mmap  = cifs_file_mmap,
 871         .splice_read = generic_file_splice_read,
 872         .llseek = cifs_llseek,
 873 #ifdef CONFIG_CIFS_POSIX
 874         .unlocked_ioctl = cifs_ioctl,
 875 #endif /* CONFIG_CIFS_POSIX */
 876         .setlease = cifs_setlease,
 877 };
 878
 879 const struct file_operations cifs_file_strict_ops = {
 880         .read = do_sync_read,
 881         .write = do_sync_write,
 882         .aio_read = cifs_strict_readv,
 883         .aio_write = cifs_strict_writev,
 884         .open = cifs_open,
 885         .release = cifs_close,
 886         .lock = cifs_lock,
 887         .fsync = cifs_strict_fsync,
 888         .flush = cifs_flush,
 889         .mmap = cifs_file_strict_mmap,
 890         .splice_read = generic_file_splice_read,
 891         .llseek = cifs_llseek,
 892 #ifdef CONFIG_CIFS_POSIX
 893         .unlocked_ioctl = cifs_ioctl,
 894 #endif /* CONFIG_CIFS_POSIX */
 895         .setlease = cifs_setlease,
 896 };
 897
 898 const struct file_operations cifs_file_direct_ops = {
 899         /* BB reevaluate whether they can be done with directio, no cache */
 900         .read = do_sync_read,
 901         .write = do_sync_write,
 902         .aio_read = cifs_user_readv,
 903         .aio_write = cifs_user_writev,
 904         .open = cifs_open,
 905         .release = cifs_close,
 906         .lock = cifs_lock,
 907         .fsync = cifs_fsync,
 908         .flush = cifs_flush,
 909         .mmap = cifs_file_mmap,
 910         .splice_read = generic_file_splice_read,
 911 #ifdef CONFIG_CIFS_POSIX
 912         .unlocked_ioctl  = cifs_ioctl,
 913 #endif /* CONFIG_CIFS_POSIX */
 914         .llseek = cifs_llseek,
 915         .setlease = cifs_setlease,
 916 };
 917
 918 const struct file_operations cifs_file_nobrl_ops = {
 919         .read = do_sync_read,
 920         .write = do_sync_write,
 921         .aio_read = generic_file_aio_read,
 922         .aio_write = cifs_file_aio_write,
 923         .open = cifs_open,
 924         .release = cifs_close,
 925         .fsync = cifs_fsync,
 926         .flush = cifs_flush,
 927         .mmap  = cifs_file_mmap,
 928         .splice_read = generic_file_splice_read,
 929         .llseek = cifs_llseek,
 930 #ifdef CONFIG_CIFS_POSIX
 931         .unlocked_ioctl = cifs_ioctl,
 932 #endif /* CONFIG_CIFS_POSIX */
 933         .setlease = cifs_setlease,
 934 };
 935
 936 const struct file_operations cifs_file_strict_nobrl_ops = {
 937         .read = do_sync_read,
 938         .write = do_sync_write,
 939         .aio_read = cifs_strict_readv,
 940         .aio_write = cifs_strict_writev,
 941         .open = cifs_open,
 942         .release = cifs_close,
 943         .fsync = cifs_strict_fsync,
 944         .flush = cifs_flush,
 945         .mmap = cifs_file_strict_mmap,
 946         .splice_read = generic_file_splice_read,
 947         .llseek = cifs_llseek,
 948 #ifdef CONFIG_CIFS_POSIX
 949         .unlocked_ioctl = cifs_ioctl,
 950 #endif /* CONFIG_CIFS_POSIX */
 951         .setlease = cifs_setlease,
 952 };
 953
 954 const struct file_operations cifs_file_direct_nobrl_ops = {
 955         /* BB reevaluate whether they can be done with directio, no cache */
 956         .read = do_sync_read,
 957         .write = do_sync_write,
 958         .aio_read = cifs_user_readv,
 959         .aio_write = cifs_user_writev,
 960         .open = cifs_open,
 961         .release = cifs_close,
 962         .fsync = cifs_fsync,
 963         .flush = cifs_flush,
 964         .mmap = cifs_file_mmap,
 965         .splice_read = generic_file_splice_read,
 966 #ifdef CONFIG_CIFS_POSIX
 967         .unlocked_ioctl  = cifs_ioctl,
 968 #endif /* CONFIG_CIFS_POSIX */
 969         .llseek = cifs_llseek,
 970         .setlease = cifs_setlease,
 971 };
 972
 973 const struct file_operations cifs_dir_ops = {
 974         .readdir = cifs_readdir,
 975         .release = cifs_closedir,
 976         .read    = generic_read_dir,
 977         .unlocked_ioctl  = cifs_ioctl,
 978         .llseek = generic_file_llseek,
 979 };
 980
 981 static void
 982 cifs_init_once(void *inode)
 983 {
 984         struct cifsInodeInfo *cifsi = inode;
 985
 986         inode_init_once(&cifsi->vfs_inode);
 987         init_rwsem(&cifsi->lock_sem);
 988 }
 989
 990 static int
 991 cifs_init_inodecache(void)
 992 {
 993         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 994                                               sizeof(struct cifsInodeInfo),
 995                                               0, (SLAB_RECLAIM_ACCOUNT|
 996                                                 SLAB_MEM_SPREAD),
 997                                               cifs_init_once);
 998         if (cifs_inode_cachep == NULL)
 999                 return -ENOMEM;
1000
1001         return 0;
1002 }
1003
1004 static void
1005 cifs_destroy_inodecache(void)
1006 {
1007         /*
1008          * Make sure all delayed rcu free inodes are flushed before we
1009          * destroy cache.
1010          */
1011         rcu_barrier();
1012         kmem_cache_destroy(cifs_inode_cachep);
1013 }
1014
1015 static int
1016 cifs_init_request_bufs(void)
1017 {
1018         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1019 #ifdef CONFIG_CIFS_SMB2
1020         /*
1021          * SMB2 maximum header size is bigger than CIFS one - no problems to
1022          * allocate some more bytes for CIFS.
1023          */
1024         max_hdr_size = MAX_SMB2_HDR_SIZE;
1025 #endif
1026         if (CIFSMaxBufSize < 8192) {
1027         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1028         Unicode path name has to fit in any SMB/CIFS path based frames */
1029                 CIFSMaxBufSize = 8192;
1030         } else if (CIFSMaxBufSize > 1024*127) {
1031                 CIFSMaxBufSize = 1024 * 127;
1032         } else {
1033                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1034         }
1035 /*
1036         cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1037                  CIFSMaxBufSize, CIFSMaxBufSize);
1038 */
1039         cifs_req_cachep = kmem_cache_create("cifs_request",
1040                                             CIFSMaxBufSize + max_hdr_size, 0,
1041                                             SLAB_HWCACHE_ALIGN, NULL);
1042         if (cifs_req_cachep == NULL)
1043                 return -ENOMEM;
1044
1045         if (cifs_min_rcv < 1)
1046                 cifs_min_rcv = 1;
1047         else if (cifs_min_rcv > 64) {
1048                 cifs_min_rcv = 64;
1049                 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1050         }
1051
1052         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1053                                                   cifs_req_cachep);
1054
1055         if (cifs_req_poolp == NULL) {
1056                 kmem_cache_destroy(cifs_req_cachep);
1057                 return -ENOMEM;
1058         }
1059         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1060         almost all handle based requests (but not write response, nor is it
1061         sufficient for path based requests).  A smaller size would have
1062         been more efficient (compacting multiple slab items on one 4k page)
1063         for the case in which debug was on, but this larger size allows
1064         more SMBs to use small buffer alloc and is still much more
1065         efficient to alloc 1 per page off the slab compared to 17K (5page)
1066         alloc of large cifs buffers even when page debugging is on */
1067         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1068                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1069                         NULL);
1070         if (cifs_sm_req_cachep == NULL) {
1071                 mempool_destroy(cifs_req_poolp);
1072                 kmem_cache_destroy(cifs_req_cachep);
1073                 return -ENOMEM;
1074         }
1075
1076         if (cifs_min_small < 2)
1077                 cifs_min_small = 2;
1078         else if (cifs_min_small > 256) {
1079                 cifs_min_small = 256;
1080                 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1081         }
1082
1083         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1084                                                      cifs_sm_req_cachep);
1085
1086         if (cifs_sm_req_poolp == NULL) {
1087                 mempool_destroy(cifs_req_poolp);
1088                 kmem_cache_destroy(cifs_req_cachep);
1089                 kmem_cache_destroy(cifs_sm_req_cachep);
1090                 return -ENOMEM;
1091         }
1092
1093         return 0;
1094 }
1095
1096 static void
1097 cifs_destroy_request_bufs(void)
1098 {
1099         mempool_destroy(cifs_req_poolp);
1100         kmem_cache_destroy(cifs_req_cachep);
1101         mempool_destroy(cifs_sm_req_poolp);
1102         kmem_cache_destroy(cifs_sm_req_cachep);
1103 }
1104
1105 static int
1106 cifs_init_mids(void)
1107 {
1108         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1109                                             sizeof(struct mid_q_entry), 0,
1110                                             SLAB_HWCACHE_ALIGN, NULL);
1111         if (cifs_mid_cachep == NULL)
1112                 return -ENOMEM;
1113
1114         /* 3 is a reasonable minimum number of simultaneous operations */
1115         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1116         if (cifs_mid_poolp == NULL) {
1117                 kmem_cache_destroy(cifs_mid_cachep);
1118                 return -ENOMEM;
1119         }
1120
1121         return 0;
1122 }
1123
1124 static void
1125 cifs_destroy_mids(void)
1126 {
1127         mempool_destroy(cifs_mid_poolp);
1128         kmem_cache_destroy(cifs_mid_cachep);
1129 }
1130
1131 static int __init
1132 init_cifs(void)
1133 {
1134         int rc = 0;
1135         cifs_proc_init();
1136         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1137 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1138         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1139         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1140 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1141 /*
1142  *  Initialize Global counters
1143  */
1144         atomic_set(&sesInfoAllocCount, 0);
1145         atomic_set(&tconInfoAllocCount, 0);
1146         atomic_set(&tcpSesAllocCount, 0);
1147         atomic_set(&tcpSesReconnectCount, 0);
1148         atomic_set(&tconInfoReconnectCount, 0);
1149
1150         atomic_set(&bufAllocCount, 0);
1151         atomic_set(&smBufAllocCount, 0);
1152 #ifdef CONFIG_CIFS_STATS2
1153         atomic_set(&totBufAllocCount, 0);
1154         atomic_set(&totSmBufAllocCount, 0);
1155 #endif /* CONFIG_CIFS_STATS2 */
1156
1157         atomic_set(&midCount, 0);
1158         GlobalCurrentXid = 0;
1159         GlobalTotalActiveXid = 0;
1160         GlobalMaxActiveXid = 0;
1161         spin_lock_init(&cifs_tcp_ses_lock);
1162         spin_lock_init(&cifs_file_list_lock);
1163         spin_lock_init(&GlobalMid_Lock);
1164
1165 #ifdef CONFIG_CIFS_SMB2
1166         get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1167 #endif
1168
1169         if (cifs_max_pending < 2) {
1170                 cifs_max_pending = 2;
1171                 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1172         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1173                 cifs_max_pending = CIFS_MAX_REQ;
1174                 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1175                          CIFS_MAX_REQ);
1176         }
1177
1178         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1179         if (!cifsiod_wq) {
1180                 rc = -ENOMEM;
1181                 goto out_clean_proc;
1182         }
1183
1184         rc = cifs_fscache_register();
1185         if (rc)
1186                 goto out_destroy_wq;
1187
1188         rc = cifs_init_inodecache();
1189         if (rc)
1190                 goto out_unreg_fscache;
1191
1192         rc = cifs_init_mids();
1193         if (rc)
1194                 goto out_destroy_inodecache;
1195
1196         rc = cifs_init_request_bufs();
1197         if (rc)
1198                 goto out_destroy_mids;
1199
1200 #ifdef CONFIG_CIFS_UPCALL
1201         rc = register_key_type(&cifs_spnego_key_type);
1202         if (rc)
1203                 goto out_destroy_request_bufs;
1204 #endif /* CONFIG_CIFS_UPCALL */
1205
1206 #ifdef CONFIG_CIFS_ACL
1207         rc = init_cifs_idmap();
1208         if (rc)
1209                 goto out_register_key_type;
1210 #endif /* CONFIG_CIFS_ACL */
1211
1212         rc = register_filesystem(&cifs_fs_type);
1213         if (rc)
1214                 goto out_init_cifs_idmap;
1215
1216         return 0;
1217
1218 out_init_cifs_idmap:
1219 #ifdef CONFIG_CIFS_ACL
1220         exit_cifs_idmap();
1221 out_register_key_type:
1222 #endif
1223 #ifdef CONFIG_CIFS_UPCALL
1224         unregister_key_type(&cifs_spnego_key_type);
1225 out_destroy_request_bufs:
1226 #endif
1227         cifs_destroy_request_bufs();
1228 out_destroy_mids:
1229         cifs_destroy_mids();
1230 out_destroy_inodecache:
1231         cifs_destroy_inodecache();
1232 out_unreg_fscache:
1233         cifs_fscache_unregister();
1234 out_destroy_wq:
1235         destroy_workqueue(cifsiod_wq);
1236 out_clean_proc:
1237         cifs_proc_clean();
1238         return rc;
1239 }
1240
1241 static void __exit
1242 exit_cifs(void)
1243 {
1244         cifs_dbg(NOISY, "exit_cifs\n");
1245         unregister_filesystem(&cifs_fs_type);
1246         cifs_dfs_release_automount_timer();
1247 #ifdef CONFIG_CIFS_ACL
1248         exit_cifs_idmap();
1249 #endif
1250 #ifdef CONFIG_CIFS_UPCALL
1251         unregister_key_type(&cifs_spnego_key_type);
1252 #endif
1253         cifs_destroy_request_bufs();
1254         cifs_destroy_mids();
1255         cifs_destroy_inodecache();
1256         cifs_fscache_unregister();
1257         destroy_workqueue(cifsiod_wq);
1258         cifs_proc_clean();
1259 }
1260
1261 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1262 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1263 MODULE_DESCRIPTION
1264     ("VFS to access servers complying with the SNIA CIFS Specification "
1265      "e.g. Samba and Windows");
1266 MODULE_VERSION(CIFS_VERSION);
1267 module_init(init_cifs)
1268 module_exit(exit_cifs)