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         if (cifs_sb_master_tcon(cifs_sb)->nocase)
 151                 sb->s_d_op = &cifs_ci_dentry_ops;
 152         else
 153                 sb->s_d_op = &cifs_dentry_ops;
 154
 155         sb->s_root = d_make_root(inode);
 156         if (!sb->s_root) {
 157                 rc = -ENOMEM;
 158                 goto out_no_root;
 159         }
 160
 161 #ifdef CONFIG_CIFS_NFSD_EXPORT
 162         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 163                 cifs_dbg(FYI, "export ops supported\n");
 164                 sb->s_export_op = &cifs_export_ops;
 165         }
 166 #endif /* CONFIG_CIFS_NFSD_EXPORT */
 167
 168         return 0;
 169
 170 out_no_root:
 171         cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
 172         return rc;
 173 }
 174
 175 static void cifs_kill_sb(struct super_block *sb)
 176 {
 177         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 178         kill_anon_super(sb);
 179         cifs_umount(cifs_sb);
 180 }
 181
 182 static int
 183 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 184 {
 185         struct super_block *sb = dentry->d_sb;
 186         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 187         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 188         struct TCP_Server_Info *server = tcon->ses->server;
 189         unsigned int xid;
 190         int rc = 0;
 191
 192         xid = get_xid();
 193
 194         /*
 195          * PATH_MAX may be too long - it would presumably be total path,
 196          * but note that some servers (includinng Samba 3) have a shorter
 197          * maximum path.
 198          *
 199          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 200          */
 201         buf->f_namelen = PATH_MAX;
 202         buf->f_files = 0;       /* undefined */
 203         buf->f_ffree = 0;       /* unlimited */
 204
 205         if (server->ops->queryfs)
 206                 rc = server->ops->queryfs(xid, tcon, buf);
 207
 208         free_xid(xid);
 209         return 0;
 210 }
 211
 212 static int cifs_permission(struct inode *inode, int mask)
 213 {
 214         struct cifs_sb_info *cifs_sb;
 215
 216         cifs_sb = CIFS_SB(inode->i_sb);
 217
 218         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 219                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 220                         return -EACCES;
 221                 else
 222                         return 0;
 223         } else /* file mode might have been restricted at mount time
 224                 on the client (above and beyond ACL on servers) for
 225                 servers which do not support setting and viewing mode bits,
 226                 so allowing client to check permissions is useful */
 227                 return generic_permission(inode, mask);
 228 }
 229
 230 static struct kmem_cache *cifs_inode_cachep;
 231 static struct kmem_cache *cifs_req_cachep;
 232 static struct kmem_cache *cifs_mid_cachep;
 233 static struct kmem_cache *cifs_sm_req_cachep;
 234 mempool_t *cifs_sm_req_poolp;
 235 mempool_t *cifs_req_poolp;
 236 mempool_t *cifs_mid_poolp;
 237
 238 static struct inode *
 239 cifs_alloc_inode(struct super_block *sb)
 240 {
 241         struct cifsInodeInfo *cifs_inode;
 242         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 243         if (!cifs_inode)
 244                 return NULL;
 245         cifs_inode->cifsAttrs = 0x20;   /* default */
 246         cifs_inode->time = 0;
 247         /*
 248          * Until the file is open and we have gotten oplock info back from the
 249          * server, can not assume caching of file data or metadata.
 250          */
 251         cifs_set_oplock_level(cifs_inode, 0);
 252         cifs_inode->delete_pending = false;
 253         cifs_inode->invalid_mapping = false;
 254         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 255         cifs_inode->server_eof = 0;
 256         cifs_inode->uniqueid = 0;
 257         cifs_inode->createtime = 0;
 258 #ifdef CONFIG_CIFS_SMB2
 259         get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
 260 #endif
 261         /*
 262          * Can not set i_flags here - they get immediately overwritten to zero
 263          * by the VFS.
 264          */
 265         /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
 266         INIT_LIST_HEAD(&cifs_inode->openFileList);
 267         INIT_LIST_HEAD(&cifs_inode->llist);
 268         return &cifs_inode->vfs_inode;
 269 }
 270
 271 static void cifs_i_callback(struct rcu_head *head)
 272 {
 273         struct inode *inode = container_of(head, struct inode, i_rcu);
 274         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 275 }
 276
 277 static void
 278 cifs_destroy_inode(struct inode *inode)
 279 {
 280         call_rcu(&inode->i_rcu, cifs_i_callback);
 281 }
 282
 283 static void
 284 cifs_evict_inode(struct inode *inode)
 285 {
 286         truncate_inode_pages(&inode->i_data, 0);
 287         clear_inode(inode);
 288         cifs_fscache_release_inode_cookie(inode);
 289 }
 290
 291 static void
 292 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 293 {
 294         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 295         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 296
 297         seq_printf(s, ",addr=");
 298
 299         switch (server->dstaddr.ss_family) {
 300         case AF_INET:
 301                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 302                 break;
 303         case AF_INET6:
 304                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 305                 if (sa6->sin6_scope_id)
 306                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 307                 break;
 308         default:
 309                 seq_printf(s, "(unknown)");
 310         }
 311 }
 312
 313 static void
 314 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
 315 {
 316         if (ses->sectype == Unspecified)
 317                 return;
 318
 319         seq_printf(s, ",sec=");
 320
 321         switch (ses->sectype) {
 322         case LANMAN:
 323                 seq_printf(s, "lanman");
 324                 break;
 325         case NTLMv2:
 326                 seq_printf(s, "ntlmv2");
 327                 break;
 328         case NTLM:
 329                 seq_printf(s, "ntlm");
 330                 break;
 331         case Kerberos:
 332                 seq_printf(s, "krb5");
 333                 break;
 334         case RawNTLMSSP:
 335                 seq_printf(s, "ntlmssp");
 336                 break;
 337         default:
 338                 /* shouldn't ever happen */
 339                 seq_printf(s, "unknown");
 340                 break;
 341         }
 342
 343         if (ses->sign)
 344                 seq_printf(s, "i");
 345 }
 346
 347 static void
 348 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
 349 {
 350         seq_printf(s, ",cache=");
 351
 352         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
 353                 seq_printf(s, "strict");
 354         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 355                 seq_printf(s, "none");
 356         else
 357                 seq_printf(s, "loose");
 358 }
 359
 360 /*
 361  * cifs_show_options() is for displaying mount options in /proc/mounts.
 362  * Not all settable options are displayed but most of the important
 363  * ones are.
 364  */
 365 static int
 366 cifs_show_options(struct seq_file *s, struct dentry *root)
 367 {
 368         struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
 369         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 370         struct sockaddr *srcaddr;
 371         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 372
 373         seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
 374         cifs_show_security(s, tcon->ses);
 375         cifs_show_cache_flavor(s, cifs_sb);
 376
 377         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 378                 seq_printf(s, ",multiuser");
 379         else if (tcon->ses->user_name)
 380                 seq_printf(s, ",username=%s", tcon->ses->user_name);
 381
 382         if (tcon->ses->domainName)
 383                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 384
 385         if (srcaddr->sa_family != AF_UNSPEC) {
 386                 struct sockaddr_in *saddr4;
 387                 struct sockaddr_in6 *saddr6;
 388                 saddr4 = (struct sockaddr_in *)srcaddr;
 389                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 390                 if (srcaddr->sa_family == AF_INET6)
 391                         seq_printf(s, ",srcaddr=%pI6c",
 392                                    &saddr6->sin6_addr);
 393                 else if (srcaddr->sa_family == AF_INET)
 394                         seq_printf(s, ",srcaddr=%pI4",
 395                                    &saddr4->sin_addr.s_addr);
 396                 else
 397                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 398                                    (int)(srcaddr->sa_family));
 399         }
 400
 401         seq_printf(s, ",uid=%u",
 402                    from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
 403         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 404                 seq_printf(s, ",forceuid");
 405         else
 406                 seq_printf(s, ",noforceuid");
 407
 408         seq_printf(s, ",gid=%u",
 409                    from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
 410         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 411                 seq_printf(s, ",forcegid");
 412         else
 413                 seq_printf(s, ",noforcegid");
 414
 415         cifs_show_address(s, tcon->ses->server);
 416
 417         if (!tcon->unix_ext)
 418                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 419                                            cifs_sb->mnt_file_mode,
 420                                            cifs_sb->mnt_dir_mode);
 421         if (tcon->seal)
 422                 seq_printf(s, ",seal");
 423         if (tcon->nocase)
 424                 seq_printf(s, ",nocase");
 425         if (tcon->retry)
 426                 seq_printf(s, ",hard");
 427         if (tcon->unix_ext)
 428                 seq_printf(s, ",unix");
 429         else
 430                 seq_printf(s, ",nounix");
 431         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 432                 seq_printf(s, ",posixpaths");
 433         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 434                 seq_printf(s, ",setuids");
 435         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 436                 seq_printf(s, ",serverino");
 437         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 438                 seq_printf(s, ",rwpidforward");
 439         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 440                 seq_printf(s, ",forcemand");
 441         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 442                 seq_printf(s, ",nouser_xattr");
 443         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 444                 seq_printf(s, ",mapchars");
 445         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 446                 seq_printf(s, ",sfu");
 447         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 448                 seq_printf(s, ",nobrl");
 449         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 450                 seq_printf(s, ",cifsacl");
 451         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 452                 seq_printf(s, ",dynperm");
 453         if (root->d_sb->s_flags & MS_POSIXACL)
 454                 seq_printf(s, ",acl");
 455         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 456                 seq_printf(s, ",mfsymlinks");
 457         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 458                 seq_printf(s, ",fsc");
 459         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 460                 seq_printf(s, ",nostrictsync");
 461         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 462                 seq_printf(s, ",noperm");
 463         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 464                 seq_printf(s, ",backupuid=%u",
 465                            from_kuid_munged(&init_user_ns,
 466                                             cifs_sb->mnt_backupuid));
 467         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 468                 seq_printf(s, ",backupgid=%u",
 469                            from_kgid_munged(&init_user_ns,
 470                                             cifs_sb->mnt_backupgid));
 471
 472         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 473         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 474         /* convert actimeo and display it in seconds */
 475         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 476
 477         return 0;
 478 }
 479
 480 static void cifs_umount_begin(struct super_block *sb)
 481 {
 482         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 483         struct cifs_tcon *tcon;
 484
 485         if (cifs_sb == NULL)
 486                 return;
 487
 488         tcon = cifs_sb_master_tcon(cifs_sb);
 489
 490         spin_lock(&cifs_tcp_ses_lock);
 491         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 492                 /* we have other mounts to same share or we have
 493                    already tried to force umount this and woken up
 494                    all waiting network requests, nothing to do */
 495                 spin_unlock(&cifs_tcp_ses_lock);
 496                 return;
 497         } else if (tcon->tc_count == 1)
 498                 tcon->tidStatus = CifsExiting;
 499         spin_unlock(&cifs_tcp_ses_lock);
 500
 501         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 502         /* cancel_notify_requests(tcon); */
 503         if (tcon->ses && tcon->ses->server) {
 504                 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
 505                 wake_up_all(&tcon->ses->server->request_q);
 506                 wake_up_all(&tcon->ses->server->response_q);
 507                 msleep(1); /* yield */
 508                 /* we have to kick the requests once more */
 509                 wake_up_all(&tcon->ses->server->response_q);
 510                 msleep(1);
 511         }
 512
 513         return;
 514 }
 515
 516 #ifdef CONFIG_CIFS_STATS2
 517 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 518 {
 519         /* BB FIXME */
 520         return 0;
 521 }
 522 #endif
 523
 524 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 525 {
 526         *flags |= MS_NODIRATIME;
 527         return 0;
 528 }
 529
 530 static int cifs_drop_inode(struct inode *inode)
 531 {
 532         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 533
 534         /* no serverino => unconditional eviction */
 535         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 536                 generic_drop_inode(inode);
 537 }
 538
 539 static const struct super_operations cifs_super_ops = {
 540         .statfs = cifs_statfs,
 541         .alloc_inode = cifs_alloc_inode,
 542         .destroy_inode = cifs_destroy_inode,
 543         .drop_inode     = cifs_drop_inode,
 544         .evict_inode    = cifs_evict_inode,
 545 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 546         function unless later we add lazy close of inodes or unless the
 547         kernel forgets to call us with the same number of releases (closes)
 548         as opens */
 549         .show_options = cifs_show_options,
 550         .umount_begin   = cifs_umount_begin,
 551         .remount_fs = cifs_remount,
 552 #ifdef CONFIG_CIFS_STATS2
 553         .show_stats = cifs_show_stats,
 554 #endif
 555 };
 556
 557 /*
 558  * Get root dentry from superblock according to prefix path mount option.
 559  * Return dentry with refcount + 1 on success and NULL otherwise.
 560  */
 561 static struct dentry *
 562 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 563 {
 564         struct dentry *dentry;
 565         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 566         char *full_path = NULL;
 567         char *s, *p;
 568         char sep;
 569
 570         full_path = cifs_build_path_to_root(vol, cifs_sb,
 571                                             cifs_sb_master_tcon(cifs_sb));
 572         if (full_path == NULL)
 573                 return ERR_PTR(-ENOMEM);
 574
 575         cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
 576
 577         sep = CIFS_DIR_SEP(cifs_sb);
 578         dentry = dget(sb->s_root);
 579         p = s = full_path;
 580
 581         do {
 582                 struct inode *dir = dentry->d_inode;
 583                 struct dentry *child;
 584
 585                 if (!dir) {
 586                         dput(dentry);
 587                         dentry = ERR_PTR(-ENOENT);
 588                         break;
 589                 }
 590                 if (!S_ISDIR(dir->i_mode)) {
 591                         dput(dentry);
 592                         dentry = ERR_PTR(-ENOTDIR);
 593                         break;
 594                 }
 595
 596                 /* skip separators */
 597                 while (*s == sep)
 598                         s++;
 599                 if (!*s)
 600                         break;
 601                 p = s++;
 602                 /* next separator */
 603                 while (*s && *s != sep)
 604                         s++;
 605
 606                 mutex_lock(&dir->i_mutex);
 607                 child = lookup_one_len(p, dentry, s - p);
 608                 mutex_unlock(&dir->i_mutex);
 609                 dput(dentry);
 610                 dentry = child;
 611         } while (!IS_ERR(dentry));
 612         kfree(full_path);
 613         return dentry;
 614 }
 615
 616 static int cifs_set_super(struct super_block *sb, void *data)
 617 {
 618         struct cifs_mnt_data *mnt_data = data;
 619         sb->s_fs_info = mnt_data->cifs_sb;
 620         return set_anon_super(sb, NULL);
 621 }
 622
 623 static struct dentry *
 624 cifs_do_mount(struct file_system_type *fs_type,
 625               int flags, const char *dev_name, void *data)
 626 {
 627         int rc;
 628         struct super_block *sb;
 629         struct cifs_sb_info *cifs_sb;
 630         struct smb_vol *volume_info;
 631         struct cifs_mnt_data mnt_data;
 632         struct dentry *root;
 633
 634         cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
 635
 636         volume_info = cifs_get_volume_info((char *)data, dev_name);
 637         if (IS_ERR(volume_info))
 638                 return ERR_CAST(volume_info);
 639
 640         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 641         if (cifs_sb == NULL) {
 642                 root = ERR_PTR(-ENOMEM);
 643                 goto out_nls;
 644         }
 645
 646         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 647         if (cifs_sb->mountdata == NULL) {
 648                 root = ERR_PTR(-ENOMEM);
 649                 goto out_cifs_sb;
 650         }
 651
 652         cifs_setup_cifs_sb(volume_info, cifs_sb);
 653
 654         rc = cifs_mount(cifs_sb, volume_info);
 655         if (rc) {
 656                 if (!(flags & MS_SILENT))
 657                         cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
 658                                  rc);
 659                 root = ERR_PTR(rc);
 660                 goto out_mountdata;
 661         }
 662
 663         mnt_data.vol = volume_info;
 664         mnt_data.cifs_sb = cifs_sb;
 665         mnt_data.flags = flags;
 666
 667         /* BB should we make this contingent on mount parm? */
 668         flags |= MS_NODIRATIME | MS_NOATIME;
 669
 670         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 671         if (IS_ERR(sb)) {
 672                 root = ERR_CAST(sb);
 673                 cifs_umount(cifs_sb);
 674                 goto out;
 675         }
 676
 677         if (sb->s_root) {
 678                 cifs_dbg(FYI, "Use existing superblock\n");
 679                 cifs_umount(cifs_sb);
 680         } else {
 681                 rc = cifs_read_super(sb);
 682                 if (rc) {
 683                         root = ERR_PTR(rc);
 684                         goto out_super;
 685                 }
 686
 687                 sb->s_flags |= MS_ACTIVE;
 688         }
 689
 690         root = cifs_get_root(volume_info, sb);
 691         if (IS_ERR(root))
 692                 goto out_super;
 693
 694         cifs_dbg(FYI, "dentry root is: %p\n", root);
 695         goto out;
 696
 697 out_super:
 698         deactivate_locked_super(sb);
 699 out:
 700         cifs_cleanup_volume_info(volume_info);
 701         return root;
 702
 703 out_mountdata:
 704         kfree(cifs_sb->mountdata);
 705 out_cifs_sb:
 706         kfree(cifs_sb);
 707 out_nls:
 708         unload_nls(volume_info->local_nls);
 709         goto out;
 710 }
 711
 712 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 713                                    unsigned long nr_segs, loff_t pos)
 714 {
 715         struct inode *inode = file_inode(iocb->ki_filp);
 716         ssize_t written;
 717         int rc;
 718
 719         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 720
 721         if (CIFS_I(inode)->clientCanCacheAll)
 722                 return written;
 723
 724         rc = filemap_fdatawrite(inode->i_mapping);
 725         if (rc)
 726                 cifs_dbg(FYI, "cifs_file_aio_write: %d rc on %p inode\n",
 727                          rc, inode);
 728
 729         return written;
 730 }
 731
 732 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
 733 {
 734         /*
 735          * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 736          * the cached file length
 737          */
 738         if (whence != SEEK_SET && whence != SEEK_CUR) {
 739                 int rc;
 740                 struct inode *inode = file_inode(file);
 741
 742                 /*
 743                  * We need to be sure that all dirty pages are written and the
 744                  * server has the newest file length.
 745                  */
 746                 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
 747                     inode->i_mapping->nrpages != 0) {
 748                         rc = filemap_fdatawait(inode->i_mapping);
 749                         if (rc) {
 750                                 mapping_set_error(inode->i_mapping, rc);
 751                                 return rc;
 752                         }
 753                 }
 754                 /*
 755                  * Some applications poll for the file length in this strange
 756                  * way so we must seek to end on non-oplocked files by
 757                  * setting the revalidate time to zero.
 758                  */
 759                 CIFS_I(inode)->time = 0;
 760
 761                 rc = cifs_revalidate_file_attr(file);
 762                 if (rc < 0)
 763                         return (loff_t)rc;
 764         }
 765         return generic_file_llseek(file, offset, whence);
 766 }
 767
 768 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 769 {
 770         /* note that this is called by vfs setlease with i_lock held
 771            to protect *lease from going away */
 772         struct inode *inode = file_inode(file);
 773         struct cifsFileInfo *cfile = file->private_data;
 774
 775         if (!(S_ISREG(inode->i_mode)))
 776                 return -EINVAL;
 777
 778         /* check if file is oplocked */
 779         if (((arg == F_RDLCK) &&
 780                 (CIFS_I(inode)->clientCanCacheRead)) ||
 781             ((arg == F_WRLCK) &&
 782                 (CIFS_I(inode)->clientCanCacheAll)))
 783                 return generic_setlease(file, arg, lease);
 784         else if (tlink_tcon(cfile->tlink)->local_lease &&
 785                  !CIFS_I(inode)->clientCanCacheRead)
 786                 /* If the server claims to support oplock on this
 787                    file, then we still need to check oplock even
 788                    if the local_lease mount option is set, but there
 789                    are servers which do not support oplock for which
 790                    this mount option may be useful if the user
 791                    knows that the file won't be changed on the server
 792                    by anyone else */
 793                 return generic_setlease(file, arg, lease);
 794         else
 795                 return -EAGAIN;
 796 }
 797
 798 struct file_system_type cifs_fs_type = {
 799         .owner = THIS_MODULE,
 800         .name = "cifs",
 801         .mount = cifs_do_mount,
 802         .kill_sb = cifs_kill_sb,
 803         /*  .fs_flags */
 804 };
 805 MODULE_ALIAS_FS("cifs");
 806 const struct inode_operations cifs_dir_inode_ops = {
 807         .create = cifs_create,
 808         .atomic_open = cifs_atomic_open,
 809         .lookup = cifs_lookup,
 810         .getattr = cifs_getattr,
 811         .unlink = cifs_unlink,
 812         .link = cifs_hardlink,
 813         .mkdir = cifs_mkdir,
 814         .rmdir = cifs_rmdir,
 815         .rename = cifs_rename,
 816         .permission = cifs_permission,
 817 /*      revalidate:cifs_revalidate,   */
 818         .setattr = cifs_setattr,
 819         .symlink = cifs_symlink,
 820         .mknod   = cifs_mknod,
 821 #ifdef CONFIG_CIFS_XATTR
 822         .setxattr = cifs_setxattr,
 823         .getxattr = cifs_getxattr,
 824         .listxattr = cifs_listxattr,
 825         .removexattr = cifs_removexattr,
 826 #endif
 827 };
 828
 829 const struct inode_operations cifs_file_inode_ops = {
 830 /*      revalidate:cifs_revalidate, */
 831         .setattr = cifs_setattr,
 832         .getattr = cifs_getattr, /* do we need this anymore? */
 833         .rename = cifs_rename,
 834         .permission = cifs_permission,
 835 #ifdef CONFIG_CIFS_XATTR
 836         .setxattr = cifs_setxattr,
 837         .getxattr = cifs_getxattr,
 838         .listxattr = cifs_listxattr,
 839         .removexattr = cifs_removexattr,
 840 #endif
 841 };
 842
 843 const struct inode_operations cifs_symlink_inode_ops = {
 844         .readlink = generic_readlink,
 845         .follow_link = cifs_follow_link,
 846         .put_link = cifs_put_link,
 847         .permission = cifs_permission,
 848         /* BB add the following two eventually */
 849         /* revalidate: cifs_revalidate,
 850            setattr:    cifs_notify_change, *//* BB do we need notify change */
 851 #ifdef CONFIG_CIFS_XATTR
 852         .setxattr = cifs_setxattr,
 853         .getxattr = cifs_getxattr,
 854         .listxattr = cifs_listxattr,
 855         .removexattr = cifs_removexattr,
 856 #endif
 857 };
 858
 859 const struct file_operations cifs_file_ops = {
 860         .read = do_sync_read,
 861         .write = do_sync_write,
 862         .aio_read = generic_file_aio_read,
 863         .aio_write = cifs_file_aio_write,
 864         .open = cifs_open,
 865         .release = cifs_close,
 866         .lock = cifs_lock,
 867         .fsync = cifs_fsync,
 868         .flush = cifs_flush,
 869         .mmap  = cifs_file_mmap,
 870         .splice_read = generic_file_splice_read,
 871         .llseek = cifs_llseek,
 872 #ifdef CONFIG_CIFS_POSIX
 873         .unlocked_ioctl = cifs_ioctl,
 874 #endif /* CONFIG_CIFS_POSIX */
 875         .setlease = cifs_setlease,
 876 };
 877
 878 const struct file_operations cifs_file_strict_ops = {
 879         .read = do_sync_read,
 880         .write = do_sync_write,
 881         .aio_read = cifs_strict_readv,
 882         .aio_write = cifs_strict_writev,
 883         .open = cifs_open,
 884         .release = cifs_close,
 885         .lock = cifs_lock,
 886         .fsync = cifs_strict_fsync,
 887         .flush = cifs_flush,
 888         .mmap = cifs_file_strict_mmap,
 889         .splice_read = generic_file_splice_read,
 890         .llseek = cifs_llseek,
 891 #ifdef CONFIG_CIFS_POSIX
 892         .unlocked_ioctl = cifs_ioctl,
 893 #endif /* CONFIG_CIFS_POSIX */
 894         .setlease = cifs_setlease,
 895 };
 896
 897 const struct file_operations cifs_file_direct_ops = {
 898         /* BB reevaluate whether they can be done with directio, no cache */
 899         .read = do_sync_read,
 900         .write = do_sync_write,
 901         .aio_read = cifs_user_readv,
 902         .aio_write = cifs_user_writev,
 903         .open = cifs_open,
 904         .release = cifs_close,
 905         .lock = cifs_lock,
 906         .fsync = cifs_fsync,
 907         .flush = cifs_flush,
 908         .mmap = cifs_file_mmap,
 909         .splice_read = generic_file_splice_read,
 910 #ifdef CONFIG_CIFS_POSIX
 911         .unlocked_ioctl  = cifs_ioctl,
 912 #endif /* CONFIG_CIFS_POSIX */
 913         .llseek = cifs_llseek,
 914         .setlease = cifs_setlease,
 915 };
 916
 917 const struct file_operations cifs_file_nobrl_ops = {
 918         .read = do_sync_read,
 919         .write = do_sync_write,
 920         .aio_read = generic_file_aio_read,
 921         .aio_write = cifs_file_aio_write,
 922         .open = cifs_open,
 923         .release = cifs_close,
 924         .fsync = cifs_fsync,
 925         .flush = cifs_flush,
 926         .mmap  = cifs_file_mmap,
 927         .splice_read = generic_file_splice_read,
 928         .llseek = cifs_llseek,
 929 #ifdef CONFIG_CIFS_POSIX
 930         .unlocked_ioctl = cifs_ioctl,
 931 #endif /* CONFIG_CIFS_POSIX */
 932         .setlease = cifs_setlease,
 933 };
 934
 935 const struct file_operations cifs_file_strict_nobrl_ops = {
 936         .read = do_sync_read,
 937         .write = do_sync_write,
 938         .aio_read = cifs_strict_readv,
 939         .aio_write = cifs_strict_writev,
 940         .open = cifs_open,
 941         .release = cifs_close,
 942         .fsync = cifs_strict_fsync,
 943         .flush = cifs_flush,
 944         .mmap = cifs_file_strict_mmap,
 945         .splice_read = generic_file_splice_read,
 946         .llseek = cifs_llseek,
 947 #ifdef CONFIG_CIFS_POSIX
 948         .unlocked_ioctl = cifs_ioctl,
 949 #endif /* CONFIG_CIFS_POSIX */
 950         .setlease = cifs_setlease,
 951 };
 952
 953 const struct file_operations cifs_file_direct_nobrl_ops = {
 954         /* BB reevaluate whether they can be done with directio, no cache */
 955         .read = do_sync_read,
 956         .write = do_sync_write,
 957         .aio_read = cifs_user_readv,
 958         .aio_write = cifs_user_writev,
 959         .open = cifs_open,
 960         .release = cifs_close,
 961         .fsync = cifs_fsync,
 962         .flush = cifs_flush,
 963         .mmap = cifs_file_mmap,
 964         .splice_read = generic_file_splice_read,
 965 #ifdef CONFIG_CIFS_POSIX
 966         .unlocked_ioctl  = cifs_ioctl,
 967 #endif /* CONFIG_CIFS_POSIX */
 968         .llseek = cifs_llseek,
 969         .setlease = cifs_setlease,
 970 };
 971
 972 const struct file_operations cifs_dir_ops = {
 973         .iterate = cifs_readdir,
 974         .release = cifs_closedir,
 975         .read    = generic_read_dir,
 976         .unlocked_ioctl  = cifs_ioctl,
 977         .llseek = generic_file_llseek,
 978 };
 979
 980 static void
 981 cifs_init_once(void *inode)
 982 {
 983         struct cifsInodeInfo *cifsi = inode;
 984
 985         inode_init_once(&cifsi->vfs_inode);
 986         init_rwsem(&cifsi->lock_sem);
 987 }
 988
 989 static int
 990 cifs_init_inodecache(void)
 991 {
 992         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 993                                               sizeof(struct cifsInodeInfo),
 994                                               0, (SLAB_RECLAIM_ACCOUNT|
 995                                                 SLAB_MEM_SPREAD),
 996                                               cifs_init_once);
 997         if (cifs_inode_cachep == NULL)
 998                 return -ENOMEM;
 999
1000         return 0;
1001 }
1002
1003 static void
1004 cifs_destroy_inodecache(void)
1005 {
1006         /*
1007          * Make sure all delayed rcu free inodes are flushed before we
1008          * destroy cache.
1009          */
1010         rcu_barrier();
1011         kmem_cache_destroy(cifs_inode_cachep);
1012 }
1013
1014 static int
1015 cifs_init_request_bufs(void)
1016 {
1017         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1018 #ifdef CONFIG_CIFS_SMB2
1019         /*
1020          * SMB2 maximum header size is bigger than CIFS one - no problems to
1021          * allocate some more bytes for CIFS.
1022          */
1023         max_hdr_size = MAX_SMB2_HDR_SIZE;
1024 #endif
1025         if (CIFSMaxBufSize < 8192) {
1026         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1027         Unicode path name has to fit in any SMB/CIFS path based frames */
1028                 CIFSMaxBufSize = 8192;
1029         } else if (CIFSMaxBufSize > 1024*127) {
1030                 CIFSMaxBufSize = 1024 * 127;
1031         } else {
1032                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1033         }
1034 /*
1035         cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1036                  CIFSMaxBufSize, CIFSMaxBufSize);
1037 */
1038         cifs_req_cachep = kmem_cache_create("cifs_request",
1039                                             CIFSMaxBufSize + max_hdr_size, 0,
1040                                             SLAB_HWCACHE_ALIGN, NULL);
1041         if (cifs_req_cachep == NULL)
1042                 return -ENOMEM;
1043
1044         if (cifs_min_rcv < 1)
1045                 cifs_min_rcv = 1;
1046         else if (cifs_min_rcv > 64) {
1047                 cifs_min_rcv = 64;
1048                 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1049         }
1050
1051         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1052                                                   cifs_req_cachep);
1053
1054         if (cifs_req_poolp == NULL) {
1055                 kmem_cache_destroy(cifs_req_cachep);
1056                 return -ENOMEM;
1057         }
1058         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1059         almost all handle based requests (but not write response, nor is it
1060         sufficient for path based requests).  A smaller size would have
1061         been more efficient (compacting multiple slab items on one 4k page)
1062         for the case in which debug was on, but this larger size allows
1063         more SMBs to use small buffer alloc and is still much more
1064         efficient to alloc 1 per page off the slab compared to 17K (5page)
1065         alloc of large cifs buffers even when page debugging is on */
1066         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1067                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1068                         NULL);
1069         if (cifs_sm_req_cachep == NULL) {
1070                 mempool_destroy(cifs_req_poolp);
1071                 kmem_cache_destroy(cifs_req_cachep);
1072                 return -ENOMEM;
1073         }
1074
1075         if (cifs_min_small < 2)
1076                 cifs_min_small = 2;
1077         else if (cifs_min_small > 256) {
1078                 cifs_min_small = 256;
1079                 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1080         }
1081
1082         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1083                                                      cifs_sm_req_cachep);
1084
1085         if (cifs_sm_req_poolp == NULL) {
1086                 mempool_destroy(cifs_req_poolp);
1087                 kmem_cache_destroy(cifs_req_cachep);
1088                 kmem_cache_destroy(cifs_sm_req_cachep);
1089                 return -ENOMEM;
1090         }
1091
1092         return 0;
1093 }
1094
1095 static void
1096 cifs_destroy_request_bufs(void)
1097 {
1098         mempool_destroy(cifs_req_poolp);
1099         kmem_cache_destroy(cifs_req_cachep);
1100         mempool_destroy(cifs_sm_req_poolp);
1101         kmem_cache_destroy(cifs_sm_req_cachep);
1102 }
1103
1104 static int
1105 cifs_init_mids(void)
1106 {
1107         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1108                                             sizeof(struct mid_q_entry), 0,
1109                                             SLAB_HWCACHE_ALIGN, NULL);
1110         if (cifs_mid_cachep == NULL)
1111                 return -ENOMEM;
1112
1113         /* 3 is a reasonable minimum number of simultaneous operations */
1114         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1115         if (cifs_mid_poolp == NULL) {
1116                 kmem_cache_destroy(cifs_mid_cachep);
1117                 return -ENOMEM;
1118         }
1119
1120         return 0;
1121 }
1122
1123 static void
1124 cifs_destroy_mids(void)
1125 {
1126         mempool_destroy(cifs_mid_poolp);
1127         kmem_cache_destroy(cifs_mid_cachep);
1128 }
1129
1130 static int __init
1131 init_cifs(void)
1132 {
1133         int rc = 0;
1134         cifs_proc_init();
1135         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1136 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1137         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1138         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1139 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1140 /*
1141  *  Initialize Global counters
1142  */
1143         atomic_set(&sesInfoAllocCount, 0);
1144         atomic_set(&tconInfoAllocCount, 0);
1145         atomic_set(&tcpSesAllocCount, 0);
1146         atomic_set(&tcpSesReconnectCount, 0);
1147         atomic_set(&tconInfoReconnectCount, 0);
1148
1149         atomic_set(&bufAllocCount, 0);
1150         atomic_set(&smBufAllocCount, 0);
1151 #ifdef CONFIG_CIFS_STATS2
1152         atomic_set(&totBufAllocCount, 0);
1153         atomic_set(&totSmBufAllocCount, 0);
1154 #endif /* CONFIG_CIFS_STATS2 */
1155
1156         atomic_set(&midCount, 0);
1157         GlobalCurrentXid = 0;
1158         GlobalTotalActiveXid = 0;
1159         GlobalMaxActiveXid = 0;
1160         spin_lock_init(&cifs_tcp_ses_lock);
1161         spin_lock_init(&cifs_file_list_lock);
1162         spin_lock_init(&GlobalMid_Lock);
1163
1164 #ifdef CONFIG_CIFS_SMB2
1165         get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1166 #endif
1167
1168         if (cifs_max_pending < 2) {
1169                 cifs_max_pending = 2;
1170                 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1171         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1172                 cifs_max_pending = CIFS_MAX_REQ;
1173                 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1174                          CIFS_MAX_REQ);
1175         }
1176
1177         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1178         if (!cifsiod_wq) {
1179                 rc = -ENOMEM;
1180                 goto out_clean_proc;
1181         }
1182
1183         rc = cifs_fscache_register();
1184         if (rc)
1185                 goto out_destroy_wq;
1186
1187         rc = cifs_init_inodecache();
1188         if (rc)
1189                 goto out_unreg_fscache;
1190
1191         rc = cifs_init_mids();
1192         if (rc)
1193                 goto out_destroy_inodecache;
1194
1195         rc = cifs_init_request_bufs();
1196         if (rc)
1197                 goto out_destroy_mids;
1198
1199 #ifdef CONFIG_CIFS_UPCALL
1200         rc = register_key_type(&cifs_spnego_key_type);
1201         if (rc)
1202                 goto out_destroy_request_bufs;
1203 #endif /* CONFIG_CIFS_UPCALL */
1204
1205 #ifdef CONFIG_CIFS_ACL
1206         rc = init_cifs_idmap();
1207         if (rc)
1208                 goto out_register_key_type;
1209 #endif /* CONFIG_CIFS_ACL */
1210
1211         rc = register_filesystem(&cifs_fs_type);
1212         if (rc)
1213                 goto out_init_cifs_idmap;
1214
1215         return 0;
1216
1217 out_init_cifs_idmap:
1218 #ifdef CONFIG_CIFS_ACL
1219         exit_cifs_idmap();
1220 out_register_key_type:
1221 #endif
1222 #ifdef CONFIG_CIFS_UPCALL
1223         unregister_key_type(&cifs_spnego_key_type);
1224 out_destroy_request_bufs:
1225 #endif
1226         cifs_destroy_request_bufs();
1227 out_destroy_mids:
1228         cifs_destroy_mids();
1229 out_destroy_inodecache:
1230         cifs_destroy_inodecache();
1231 out_unreg_fscache:
1232         cifs_fscache_unregister();
1233 out_destroy_wq:
1234         destroy_workqueue(cifsiod_wq);
1235 out_clean_proc:
1236         cifs_proc_clean();
1237         return rc;
1238 }
1239
1240 static void __exit
1241 exit_cifs(void)
1242 {
1243         cifs_dbg(NOISY, "exit_cifs\n");
1244         unregister_filesystem(&cifs_fs_type);
1245         cifs_dfs_release_automount_timer();
1246 #ifdef CONFIG_CIFS_ACL
1247         exit_cifs_idmap();
1248 #endif
1249 #ifdef CONFIG_CIFS_UPCALL
1250         unregister_key_type(&cifs_spnego_key_type);
1251 #endif
1252         cifs_destroy_request_bufs();
1253         cifs_destroy_mids();
1254         cifs_destroy_inodecache();
1255         cifs_fscache_unregister();
1256         destroy_workqueue(cifsiod_wq);
1257         cifs_proc_clean();
1258 }
1259
1260 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1261 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1262 MODULE_DESCRIPTION
1263     ("VFS to access servers complying with the SNIA CIFS Specification "
1264      "e.g. Samba and Windows");
1265 MODULE_VERSION(CIFS_VERSION);
1266 module_init(init_cifs)
1267 module_exit(exit_cifs)