fs/cifs/cifsfs.c

   1 /*
   2  *   fs/cifs/cifsfs.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2008
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   Common Internet FileSystem (CIFS) client
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 /* Note that BB means BUGBUG (ie something to fix eventually) */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/mount.h>
  29 #include <linux/slab.h>
  30 #include <linux/init.h>
  31 #include <linux/list.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/vfs.h>
  34 #include <linux/mempool.h>
  35 #include <linux/delay.h>
  36 #include <linux/kthread.h>
  37 #include <linux/freezer.h>
  38 #include <linux/namei.h>
  39 #include <linux/random.h>
  40 #include <net/ipv6.h>
  41 #include "cifsfs.h"
  42 #include "cifspdu.h"
  43 #define DECLARE_GLOBALS_HERE
  44 #include "cifsglob.h"
  45 #include "cifsproto.h"
  46 #include "cifs_debug.h"
  47 #include "cifs_fs_sb.h"
  48 #include <linux/mm.h>
  49 #include <linux/key-type.h>
  50 #include "cifs_spnego.h"
  51 #include "fscache.h"
  52 #ifdef CONFIG_CIFS_SMB2
  53 #include "smb2pdu.h"
  54 #endif
  55
  56 int cifsFYI = 0;
  57 int cifsERROR = 1;
  58 int traceSMB = 0;
  59 bool enable_oplocks = true;
  60 unsigned int linuxExtEnabled = 1;
  61 unsigned int lookupCacheEnabled = 1;
  62 unsigned int global_secflags = CIFSSEC_DEF;
  63 /* unsigned int ntlmv2_support = 0; */
  64 unsigned int sign_CIFS_PDUs = 1;
  65 static const struct super_operations cifs_super_ops;
  66 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  67 module_param(CIFSMaxBufSize, uint, 0);
  68 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  69                                  "Default: 16384 Range: 8192 to 130048");
  70 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  71 module_param(cifs_min_rcv, uint, 0);
  72 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  73                                 "1 to 64");
  74 unsigned int cifs_min_small = 30;
  75 module_param(cifs_min_small, uint, 0);
  76 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  77                                  "Range: 2 to 256");
  78 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  79 module_param(cifs_max_pending, uint, 0444);
  80 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  81                                    "Default: 32767 Range: 2 to 32767.");
  82 module_param(enable_oplocks, bool, 0644);
  83 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
  84
  85 extern mempool_t *cifs_sm_req_poolp;
  86 extern mempool_t *cifs_req_poolp;
  87 extern mempool_t *cifs_mid_poolp;
  88
  89 struct workqueue_struct *cifsiod_wq;
  90
  91 #ifdef CONFIG_CIFS_SMB2
  92 __u8 cifs_client_guid[SMB2_CLIENT_GUID_SIZE];
  93 #endif
  94
  95 static int
  96 cifs_read_super(struct super_block *sb)
  97 {
  98         struct inode *inode;
  99         struct cifs_sb_info *cifs_sb;
 100         int rc = 0;
 101
 102         cifs_sb = CIFS_SB(sb);
 103
 104         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
 105                 sb->s_flags |= MS_POSIXACL;
 106
 107         if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES)
 108                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 109         else
 110                 sb->s_maxbytes = MAX_NON_LFS;
 111
 112         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
 113         sb->s_time_gran = 100;
 114
 115         sb->s_magic = CIFS_MAGIC_NUMBER;
 116         sb->s_op = &cifs_super_ops;
 117         sb->s_bdi = &cifs_sb->bdi;
 118         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 119         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 120         inode = cifs_root_iget(sb);
 121
 122         if (IS_ERR(inode)) {
 123                 rc = PTR_ERR(inode);
 124                 goto out_no_root;
 125         }
 126
 127         sb->s_root = d_make_root(inode);
 128         if (!sb->s_root) {
 129                 rc = -ENOMEM;
 130                 goto out_no_root;
 131         }
 132
 133         /* do that *after* d_make_root() - we want NULL ->d_op for root here */
 134         if (cifs_sb_master_tcon(cifs_sb)->nocase)
 135                 sb->s_d_op = &cifs_ci_dentry_ops;
 136         else
 137                 sb->s_d_op = &cifs_dentry_ops;
 138
 139 #ifdef CONFIG_CIFS_NFSD_EXPORT
 140         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 141                 cFYI(1, "export ops supported");
 142                 sb->s_export_op = &cifs_export_ops;
 143         }
 144 #endif /* CONFIG_CIFS_NFSD_EXPORT */
 145
 146         return 0;
 147
 148 out_no_root:
 149         cERROR(1, "cifs_read_super: get root inode failed");
 150         return rc;
 151 }
 152
 153 static void cifs_kill_sb(struct super_block *sb)
 154 {
 155         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 156         kill_anon_super(sb);
 157         cifs_umount(cifs_sb);
 158 }
 159
 160 static int
 161 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 162 {
 163         struct super_block *sb = dentry->d_sb;
 164         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 165         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 166         struct TCP_Server_Info *server = tcon->ses->server;
 167         unsigned int xid;
 168         int rc = 0;
 169
 170         xid = get_xid();
 171
 172         /*
 173          * PATH_MAX may be too long - it would presumably be total path,
 174          * but note that some servers (includinng Samba 3) have a shorter
 175          * maximum path.
 176          *
 177          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 178          */
 179         buf->f_namelen = PATH_MAX;
 180         buf->f_files = 0;       /* undefined */
 181         buf->f_ffree = 0;       /* unlimited */
 182
 183         if (server->ops->queryfs)
 184                 rc = server->ops->queryfs(xid, tcon, buf);
 185
 186         free_xid(xid);
 187         return 0;
 188 }
 189
 190 static int cifs_permission(struct inode *inode, int mask)
 191 {
 192         struct cifs_sb_info *cifs_sb;
 193
 194         cifs_sb = CIFS_SB(inode->i_sb);
 195
 196         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 197                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 198                         return -EACCES;
 199                 else
 200                         return 0;
 201         } else /* file mode might have been restricted at mount time
 202                 on the client (above and beyond ACL on servers) for
 203                 servers which do not support setting and viewing mode bits,
 204                 so allowing client to check permissions is useful */
 205                 return generic_permission(inode, mask);
 206 }
 207
 208 static struct kmem_cache *cifs_inode_cachep;
 209 static struct kmem_cache *cifs_req_cachep;
 210 static struct kmem_cache *cifs_mid_cachep;
 211 static struct kmem_cache *cifs_sm_req_cachep;
 212 mempool_t *cifs_sm_req_poolp;
 213 mempool_t *cifs_req_poolp;
 214 mempool_t *cifs_mid_poolp;
 215
 216 static struct inode *
 217 cifs_alloc_inode(struct super_block *sb)
 218 {
 219         struct cifsInodeInfo *cifs_inode;
 220         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 221         if (!cifs_inode)
 222                 return NULL;
 223         cifs_inode->cifsAttrs = 0x20;   /* default */
 224         cifs_inode->time = 0;
 225         /*
 226          * Until the file is open and we have gotten oplock info back from the
 227          * server, can not assume caching of file data or metadata.
 228          */
 229         cifs_set_oplock_level(cifs_inode, 0);
 230         cifs_inode->delete_pending = false;
 231         cifs_inode->invalid_mapping = false;
 232         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 233         cifs_inode->server_eof = 0;
 234         cifs_inode->uniqueid = 0;
 235         cifs_inode->createtime = 0;
 236 #ifdef CONFIG_CIFS_SMB2
 237         get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
 238 #endif
 239         /*
 240          * Can not set i_flags here - they get immediately overwritten to zero
 241          * by the VFS.
 242          */
 243         /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
 244         INIT_LIST_HEAD(&cifs_inode->openFileList);
 245         INIT_LIST_HEAD(&cifs_inode->llist);
 246         return &cifs_inode->vfs_inode;
 247 }
 248
 249 static void cifs_i_callback(struct rcu_head *head)
 250 {
 251         struct inode *inode = container_of(head, struct inode, i_rcu);
 252         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 253 }
 254
 255 static void
 256 cifs_destroy_inode(struct inode *inode)
 257 {
 258         call_rcu(&inode->i_rcu, cifs_i_callback);
 259 }
 260
 261 static void
 262 cifs_evict_inode(struct inode *inode)
 263 {
 264         truncate_inode_pages(&inode->i_data, 0);
 265         clear_inode(inode);
 266         cifs_fscache_release_inode_cookie(inode);
 267 }
 268
 269 static void
 270 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 271 {
 272         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 273         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 274
 275         seq_printf(s, ",addr=");
 276
 277         switch (server->dstaddr.ss_family) {
 278         case AF_INET:
 279                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 280                 break;
 281         case AF_INET6:
 282                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 283                 if (sa6->sin6_scope_id)
 284                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 285                 break;
 286         default:
 287                 seq_printf(s, "(unknown)");
 288         }
 289 }
 290
 291 static void
 292 cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server)
 293 {
 294         seq_printf(s, ",sec=");
 295
 296         switch (server->secType) {
 297         case LANMAN:
 298                 seq_printf(s, "lanman");
 299                 break;
 300         case NTLMv2:
 301                 seq_printf(s, "ntlmv2");
 302                 break;
 303         case NTLM:
 304                 seq_printf(s, "ntlm");
 305                 break;
 306         case Kerberos:
 307                 seq_printf(s, "krb5");
 308                 break;
 309         case RawNTLMSSP:
 310                 seq_printf(s, "ntlmssp");
 311                 break;
 312         default:
 313                 /* shouldn't ever happen */
 314                 seq_printf(s, "unknown");
 315                 break;
 316         }
 317
 318         if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
 319                 seq_printf(s, "i");
 320 }
 321
 322 static void
 323 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
 324 {
 325         seq_printf(s, ",cache=");
 326
 327         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
 328                 seq_printf(s, "strict");
 329         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 330                 seq_printf(s, "none");
 331         else
 332                 seq_printf(s, "loose");
 333 }
 334
 335 /*
 336  * cifs_show_options() is for displaying mount options in /proc/mounts.
 337  * Not all settable options are displayed but most of the important
 338  * ones are.
 339  */
 340 static int
 341 cifs_show_options(struct seq_file *s, struct dentry *root)
 342 {
 343         struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
 344         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 345         struct sockaddr *srcaddr;
 346         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 347
 348         seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
 349         cifs_show_security(s, tcon->ses->server);
 350         cifs_show_cache_flavor(s, cifs_sb);
 351
 352         seq_printf(s, ",unc=");
 353         seq_escape(s, tcon->treeName, " \t\n\\");
 354
 355         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 356                 seq_printf(s, ",multiuser");
 357         else if (tcon->ses->user_name)
 358                 seq_printf(s, ",username=%s", tcon->ses->user_name);
 359
 360         if (tcon->ses->domainName)
 361                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 362
 363         if (srcaddr->sa_family != AF_UNSPEC) {
 364                 struct sockaddr_in *saddr4;
 365                 struct sockaddr_in6 *saddr6;
 366                 saddr4 = (struct sockaddr_in *)srcaddr;
 367                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 368                 if (srcaddr->sa_family == AF_INET6)
 369                         seq_printf(s, ",srcaddr=%pI6c",
 370                                    &saddr6->sin6_addr);
 371                 else if (srcaddr->sa_family == AF_INET)
 372                         seq_printf(s, ",srcaddr=%pI4",
 373                                    &saddr4->sin_addr.s_addr);
 374                 else
 375                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 376                                    (int)(srcaddr->sa_family));
 377         }
 378
 379         seq_printf(s, ",uid=%u", cifs_sb->mnt_uid);
 380         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 381                 seq_printf(s, ",forceuid");
 382         else
 383                 seq_printf(s, ",noforceuid");
 384
 385         seq_printf(s, ",gid=%u", cifs_sb->mnt_gid);
 386         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 387                 seq_printf(s, ",forcegid");
 388         else
 389                 seq_printf(s, ",noforcegid");
 390
 391         cifs_show_address(s, tcon->ses->server);
 392
 393         if (!tcon->unix_ext)
 394                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 395                                            cifs_sb->mnt_file_mode,
 396                                            cifs_sb->mnt_dir_mode);
 397         if (tcon->seal)
 398                 seq_printf(s, ",seal");
 399         if (tcon->nocase)
 400                 seq_printf(s, ",nocase");
 401         if (tcon->retry)
 402                 seq_printf(s, ",hard");
 403         if (tcon->unix_ext)
 404                 seq_printf(s, ",unix");
 405         else
 406                 seq_printf(s, ",nounix");
 407         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 408                 seq_printf(s, ",posixpaths");
 409         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 410                 seq_printf(s, ",setuids");
 411         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 412                 seq_printf(s, ",serverino");
 413         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 414                 seq_printf(s, ",rwpidforward");
 415         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 416                 seq_printf(s, ",forcemand");
 417         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 418                 seq_printf(s, ",nouser_xattr");
 419         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 420                 seq_printf(s, ",mapchars");
 421         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 422                 seq_printf(s, ",sfu");
 423         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 424                 seq_printf(s, ",nobrl");
 425         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 426                 seq_printf(s, ",cifsacl");
 427         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 428                 seq_printf(s, ",dynperm");
 429         if (root->d_sb->s_flags & MS_POSIXACL)
 430                 seq_printf(s, ",acl");
 431         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 432                 seq_printf(s, ",mfsymlinks");
 433         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 434                 seq_printf(s, ",fsc");
 435         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 436                 seq_printf(s, ",nostrictsync");
 437         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 438                 seq_printf(s, ",noperm");
 439         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 440                 seq_printf(s, ",backupuid=%u", cifs_sb->mnt_backupuid);
 441         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 442                 seq_printf(s, ",backupgid=%u", cifs_sb->mnt_backupgid);
 443
 444         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 445         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 446         /* convert actimeo and display it in seconds */
 447         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 448
 449         return 0;
 450 }
 451
 452 static void cifs_umount_begin(struct super_block *sb)
 453 {
 454         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 455         struct cifs_tcon *tcon;
 456
 457         if (cifs_sb == NULL)
 458                 return;
 459
 460         tcon = cifs_sb_master_tcon(cifs_sb);
 461
 462         spin_lock(&cifs_tcp_ses_lock);
 463         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 464                 /* we have other mounts to same share or we have
 465                    already tried to force umount this and woken up
 466                    all waiting network requests, nothing to do */
 467                 spin_unlock(&cifs_tcp_ses_lock);
 468                 return;
 469         } else if (tcon->tc_count == 1)
 470                 tcon->tidStatus = CifsExiting;
 471         spin_unlock(&cifs_tcp_ses_lock);
 472
 473         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 474         /* cancel_notify_requests(tcon); */
 475         if (tcon->ses && tcon->ses->server) {
 476                 cFYI(1, "wake up tasks now - umount begin not complete");
 477                 wake_up_all(&tcon->ses->server->request_q);
 478                 wake_up_all(&tcon->ses->server->response_q);
 479                 msleep(1); /* yield */
 480                 /* we have to kick the requests once more */
 481                 wake_up_all(&tcon->ses->server->response_q);
 482                 msleep(1);
 483         }
 484
 485         return;
 486 }
 487
 488 #ifdef CONFIG_CIFS_STATS2
 489 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 490 {
 491         /* BB FIXME */
 492         return 0;
 493 }
 494 #endif
 495
 496 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 497 {
 498         *flags |= MS_NODIRATIME;
 499         return 0;
 500 }
 501
 502 static int cifs_drop_inode(struct inode *inode)
 503 {
 504         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 505
 506         /* no serverino => unconditional eviction */
 507         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 508                 generic_drop_inode(inode);
 509 }
 510
 511 static const struct super_operations cifs_super_ops = {
 512         .statfs = cifs_statfs,
 513         .alloc_inode = cifs_alloc_inode,
 514         .destroy_inode = cifs_destroy_inode,
 515         .drop_inode     = cifs_drop_inode,
 516         .evict_inode    = cifs_evict_inode,
 517 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 518         function unless later we add lazy close of inodes or unless the
 519         kernel forgets to call us with the same number of releases (closes)
 520         as opens */
 521         .show_options = cifs_show_options,
 522         .umount_begin   = cifs_umount_begin,
 523         .remount_fs = cifs_remount,
 524 #ifdef CONFIG_CIFS_STATS2
 525         .show_stats = cifs_show_stats,
 526 #endif
 527 };
 528
 529 /*
 530  * Get root dentry from superblock according to prefix path mount option.
 531  * Return dentry with refcount + 1 on success and NULL otherwise.
 532  */
 533 static struct dentry *
 534 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 535 {
 536         struct dentry *dentry;
 537         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 538         char *full_path = NULL;
 539         char *s, *p;
 540         char sep;
 541
 542         full_path = build_path_to_root(vol, cifs_sb,
 543                                        cifs_sb_master_tcon(cifs_sb));
 544         if (full_path == NULL)
 545                 return ERR_PTR(-ENOMEM);
 546
 547         cFYI(1, "Get root dentry for %s", full_path);
 548
 549         sep = CIFS_DIR_SEP(cifs_sb);
 550         dentry = dget(sb->s_root);
 551         p = s = full_path;
 552
 553         do {
 554                 struct inode *dir = dentry->d_inode;
 555                 struct dentry *child;
 556
 557                 if (!dir) {
 558                         dput(dentry);
 559                         dentry = ERR_PTR(-ENOENT);
 560                         break;
 561                 }
 562
 563                 /* skip separators */
 564                 while (*s == sep)
 565                         s++;
 566                 if (!*s)
 567                         break;
 568                 p = s++;
 569                 /* next separator */
 570                 while (*s && *s != sep)
 571                         s++;
 572
 573                 mutex_lock(&dir->i_mutex);
 574                 child = lookup_one_len(p, dentry, s - p);
 575                 mutex_unlock(&dir->i_mutex);
 576                 dput(dentry);
 577                 dentry = child;
 578         } while (!IS_ERR(dentry));
 579         kfree(full_path);
 580         return dentry;
 581 }
 582
 583 static int cifs_set_super(struct super_block *sb, void *data)
 584 {
 585         struct cifs_mnt_data *mnt_data = data;
 586         sb->s_fs_info = mnt_data->cifs_sb;
 587         return set_anon_super(sb, NULL);
 588 }
 589
 590 static struct dentry *
 591 cifs_do_mount(struct file_system_type *fs_type,
 592               int flags, const char *dev_name, void *data)
 593 {
 594         int rc;
 595         struct super_block *sb;
 596         struct cifs_sb_info *cifs_sb;
 597         struct smb_vol *volume_info;
 598         struct cifs_mnt_data mnt_data;
 599         struct dentry *root;
 600
 601         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 602
 603         volume_info = cifs_get_volume_info((char *)data, dev_name);
 604         if (IS_ERR(volume_info))
 605                 return ERR_CAST(volume_info);
 606
 607         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 608         if (cifs_sb == NULL) {
 609                 root = ERR_PTR(-ENOMEM);
 610                 goto out_nls;
 611         }
 612
 613         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 614         if (cifs_sb->mountdata == NULL) {
 615                 root = ERR_PTR(-ENOMEM);
 616                 goto out_cifs_sb;
 617         }
 618
 619         cifs_setup_cifs_sb(volume_info, cifs_sb);
 620
 621         rc = cifs_mount(cifs_sb, volume_info);
 622         if (rc) {
 623                 if (!(flags & MS_SILENT))
 624                         cERROR(1, "cifs_mount failed w/return code = %d", rc);
 625                 root = ERR_PTR(rc);
 626                 goto out_mountdata;
 627         }
 628
 629         mnt_data.vol = volume_info;
 630         mnt_data.cifs_sb = cifs_sb;
 631         mnt_data.flags = flags;
 632
 633         /* BB should we make this contingent on mount parm? */
 634         flags |= MS_NODIRATIME | MS_NOATIME;
 635
 636         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 637         if (IS_ERR(sb)) {
 638                 root = ERR_CAST(sb);
 639                 cifs_umount(cifs_sb);
 640                 goto out;
 641         }
 642
 643         if (sb->s_root) {
 644                 cFYI(1, "Use existing superblock");
 645                 cifs_umount(cifs_sb);
 646         } else {
 647                 rc = cifs_read_super(sb);
 648                 if (rc) {
 649                         root = ERR_PTR(rc);
 650                         goto out_super;
 651                 }
 652
 653                 sb->s_flags |= MS_ACTIVE;
 654         }
 655
 656         root = cifs_get_root(volume_info, sb);
 657         if (IS_ERR(root))
 658                 goto out_super;
 659
 660         cFYI(1, "dentry root is: %p", root);
 661         goto out;
 662
 663 out_super:
 664         deactivate_locked_super(sb);
 665 out:
 666         cifs_cleanup_volume_info(volume_info);
 667         return root;
 668
 669 out_mountdata:
 670         kfree(cifs_sb->mountdata);
 671 out_cifs_sb:
 672         kfree(cifs_sb);
 673 out_nls:
 674         unload_nls(volume_info->local_nls);
 675         goto out;
 676 }
 677
 678 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 679                                    unsigned long nr_segs, loff_t pos)
 680 {
 681         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 682         ssize_t written;
 683         int rc;
 684
 685         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 686
 687         if (CIFS_I(inode)->clientCanCacheAll)
 688                 return written;
 689
 690         rc = filemap_fdatawrite(inode->i_mapping);
 691         if (rc)
 692                 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
 693
 694         return written;
 695 }
 696
 697 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 698 {
 699         /*
 700          * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 701          * the cached file length
 702          */
 703         if (origin != SEEK_SET && origin != SEEK_CUR) {
 704                 int rc;
 705                 struct inode *inode = file->f_path.dentry->d_inode;
 706
 707                 /*
 708                  * We need to be sure that all dirty pages are written and the
 709                  * server has the newest file length.
 710                  */
 711                 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
 712                     inode->i_mapping->nrpages != 0) {
 713                         rc = filemap_fdatawait(inode->i_mapping);
 714                         if (rc) {
 715                                 mapping_set_error(inode->i_mapping, rc);
 716                                 return rc;
 717                         }
 718                 }
 719                 /*
 720                  * Some applications poll for the file length in this strange
 721                  * way so we must seek to end on non-oplocked files by
 722                  * setting the revalidate time to zero.
 723                  */
 724                 CIFS_I(inode)->time = 0;
 725
 726                 rc = cifs_revalidate_file_attr(file);
 727                 if (rc < 0)
 728                         return (loff_t)rc;
 729         }
 730         return generic_file_llseek(file, offset, origin);
 731 }
 732
 733 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 734 {
 735         /* note that this is called by vfs setlease with lock_flocks held
 736            to protect *lease from going away */
 737         struct inode *inode = file->f_path.dentry->d_inode;
 738         struct cifsFileInfo *cfile = file->private_data;
 739
 740         if (!(S_ISREG(inode->i_mode)))
 741                 return -EINVAL;
 742
 743         /* check if file is oplocked */
 744         if (((arg == F_RDLCK) &&
 745                 (CIFS_I(inode)->clientCanCacheRead)) ||
 746             ((arg == F_WRLCK) &&
 747                 (CIFS_I(inode)->clientCanCacheAll)))
 748                 return generic_setlease(file, arg, lease);
 749         else if (tlink_tcon(cfile->tlink)->local_lease &&
 750                  !CIFS_I(inode)->clientCanCacheRead)
 751                 /* If the server claims to support oplock on this
 752                    file, then we still need to check oplock even
 753                    if the local_lease mount option is set, but there
 754                    are servers which do not support oplock for which
 755                    this mount option may be useful if the user
 756                    knows that the file won't be changed on the server
 757                    by anyone else */
 758                 return generic_setlease(file, arg, lease);
 759         else
 760                 return -EAGAIN;
 761 }
 762
 763 struct file_system_type cifs_fs_type = {
 764         .owner = THIS_MODULE,
 765         .name = "cifs",
 766         .mount = cifs_do_mount,
 767         .kill_sb = cifs_kill_sb,
 768         /*  .fs_flags */
 769 };
 770 const struct inode_operations cifs_dir_inode_ops = {
 771         .create = cifs_create,
 772         .atomic_open = cifs_atomic_open,
 773         .lookup = cifs_lookup,
 774         .getattr = cifs_getattr,
 775         .unlink = cifs_unlink,
 776         .link = cifs_hardlink,
 777         .mkdir = cifs_mkdir,
 778         .rmdir = cifs_rmdir,
 779         .rename = cifs_rename,
 780         .permission = cifs_permission,
 781 /*      revalidate:cifs_revalidate,   */
 782         .setattr = cifs_setattr,
 783         .symlink = cifs_symlink,
 784         .mknod   = cifs_mknod,
 785 #ifdef CONFIG_CIFS_XATTR
 786         .setxattr = cifs_setxattr,
 787         .getxattr = cifs_getxattr,
 788         .listxattr = cifs_listxattr,
 789         .removexattr = cifs_removexattr,
 790 #endif
 791 };
 792
 793 const struct inode_operations cifs_file_inode_ops = {
 794 /*      revalidate:cifs_revalidate, */
 795         .setattr = cifs_setattr,
 796         .getattr = cifs_getattr, /* do we need this anymore? */
 797         .rename = cifs_rename,
 798         .permission = cifs_permission,
 799 #ifdef CONFIG_CIFS_XATTR
 800         .setxattr = cifs_setxattr,
 801         .getxattr = cifs_getxattr,
 802         .listxattr = cifs_listxattr,
 803         .removexattr = cifs_removexattr,
 804 #endif
 805 };
 806
 807 const struct inode_operations cifs_symlink_inode_ops = {
 808         .readlink = generic_readlink,
 809         .follow_link = cifs_follow_link,
 810         .put_link = cifs_put_link,
 811         .permission = cifs_permission,
 812         /* BB add the following two eventually */
 813         /* revalidate: cifs_revalidate,
 814            setattr:    cifs_notify_change, *//* BB do we need notify change */
 815 #ifdef CONFIG_CIFS_XATTR
 816         .setxattr = cifs_setxattr,
 817         .getxattr = cifs_getxattr,
 818         .listxattr = cifs_listxattr,
 819         .removexattr = cifs_removexattr,
 820 #endif
 821 };
 822
 823 const struct file_operations cifs_file_ops = {
 824         .read = do_sync_read,
 825         .write = do_sync_write,
 826         .aio_read = generic_file_aio_read,
 827         .aio_write = cifs_file_aio_write,
 828         .open = cifs_open,
 829         .release = cifs_close,
 830         .lock = cifs_lock,
 831         .fsync = cifs_fsync,
 832         .flush = cifs_flush,
 833         .mmap  = cifs_file_mmap,
 834         .splice_read = generic_file_splice_read,
 835         .llseek = cifs_llseek,
 836 #ifdef CONFIG_CIFS_POSIX
 837         .unlocked_ioctl = cifs_ioctl,
 838 #endif /* CONFIG_CIFS_POSIX */
 839         .setlease = cifs_setlease,
 840 };
 841
 842 const struct file_operations cifs_file_strict_ops = {
 843         .read = do_sync_read,
 844         .write = do_sync_write,
 845         .aio_read = cifs_strict_readv,
 846         .aio_write = cifs_strict_writev,
 847         .open = cifs_open,
 848         .release = cifs_close,
 849         .lock = cifs_lock,
 850         .fsync = cifs_strict_fsync,
 851         .flush = cifs_flush,
 852         .mmap = cifs_file_strict_mmap,
 853         .splice_read = generic_file_splice_read,
 854         .llseek = cifs_llseek,
 855 #ifdef CONFIG_CIFS_POSIX
 856         .unlocked_ioctl = cifs_ioctl,
 857 #endif /* CONFIG_CIFS_POSIX */
 858         .setlease = cifs_setlease,
 859 };
 860
 861 const struct file_operations cifs_file_direct_ops = {
 862         /* BB reevaluate whether they can be done with directio, no cache */
 863         .read = do_sync_read,
 864         .write = do_sync_write,
 865         .aio_read = cifs_user_readv,
 866         .aio_write = cifs_user_writev,
 867         .open = cifs_open,
 868         .release = cifs_close,
 869         .lock = cifs_lock,
 870         .fsync = cifs_fsync,
 871         .flush = cifs_flush,
 872         .mmap = cifs_file_mmap,
 873         .splice_read = generic_file_splice_read,
 874 #ifdef CONFIG_CIFS_POSIX
 875         .unlocked_ioctl  = cifs_ioctl,
 876 #endif /* CONFIG_CIFS_POSIX */
 877         .llseek = cifs_llseek,
 878         .setlease = cifs_setlease,
 879 };
 880
 881 const struct file_operations cifs_file_nobrl_ops = {
 882         .read = do_sync_read,
 883         .write = do_sync_write,
 884         .aio_read = generic_file_aio_read,
 885         .aio_write = cifs_file_aio_write,
 886         .open = cifs_open,
 887         .release = cifs_close,
 888         .fsync = cifs_fsync,
 889         .flush = cifs_flush,
 890         .mmap  = cifs_file_mmap,
 891         .splice_read = generic_file_splice_read,
 892         .llseek = cifs_llseek,
 893 #ifdef CONFIG_CIFS_POSIX
 894         .unlocked_ioctl = cifs_ioctl,
 895 #endif /* CONFIG_CIFS_POSIX */
 896         .setlease = cifs_setlease,
 897 };
 898
 899 const struct file_operations cifs_file_strict_nobrl_ops = {
 900         .read = do_sync_read,
 901         .write = do_sync_write,
 902         .aio_read = cifs_strict_readv,
 903         .aio_write = cifs_strict_writev,
 904         .open = cifs_open,
 905         .release = cifs_close,
 906         .fsync = cifs_strict_fsync,
 907         .flush = cifs_flush,
 908         .mmap = cifs_file_strict_mmap,
 909         .splice_read = generic_file_splice_read,
 910         .llseek = cifs_llseek,
 911 #ifdef CONFIG_CIFS_POSIX
 912         .unlocked_ioctl = cifs_ioctl,
 913 #endif /* CONFIG_CIFS_POSIX */
 914         .setlease = cifs_setlease,
 915 };
 916
 917 const struct file_operations cifs_file_direct_nobrl_ops = {
 918         /* BB reevaluate whether they can be done with directio, no cache */
 919         .read = do_sync_read,
 920         .write = do_sync_write,
 921         .aio_read = cifs_user_readv,
 922         .aio_write = cifs_user_writev,
 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 #ifdef CONFIG_CIFS_POSIX
 930         .unlocked_ioctl  = cifs_ioctl,
 931 #endif /* CONFIG_CIFS_POSIX */
 932         .llseek = cifs_llseek,
 933         .setlease = cifs_setlease,
 934 };
 935
 936 const struct file_operations cifs_dir_ops = {
 937         .readdir = cifs_readdir,
 938         .release = cifs_closedir,
 939         .read    = generic_read_dir,
 940         .unlocked_ioctl  = cifs_ioctl,
 941         .llseek = generic_file_llseek,
 942 };
 943
 944 static void
 945 cifs_init_once(void *inode)
 946 {
 947         struct cifsInodeInfo *cifsi = inode;
 948
 949         inode_init_once(&cifsi->vfs_inode);
 950         init_rwsem(&cifsi->lock_sem);
 951 }
 952
 953 static int
 954 cifs_init_inodecache(void)
 955 {
 956         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 957                                               sizeof(struct cifsInodeInfo),
 958                                               0, (SLAB_RECLAIM_ACCOUNT|
 959                                                 SLAB_MEM_SPREAD),
 960                                               cifs_init_once);
 961         if (cifs_inode_cachep == NULL)
 962                 return -ENOMEM;
 963
 964         return 0;
 965 }
 966
 967 static void
 968 cifs_destroy_inodecache(void)
 969 {
 970         /*
 971          * Make sure all delayed rcu free inodes are flushed before we
 972          * destroy cache.
 973          */
 974         rcu_barrier();
 975         kmem_cache_destroy(cifs_inode_cachep);
 976 }
 977
 978 static int
 979 cifs_init_request_bufs(void)
 980 {
 981         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
 982 #ifdef CONFIG_CIFS_SMB2
 983         /*
 984          * SMB2 maximum header size is bigger than CIFS one - no problems to
 985          * allocate some more bytes for CIFS.
 986          */
 987         max_hdr_size = MAX_SMB2_HDR_SIZE;
 988 #endif
 989         if (CIFSMaxBufSize < 8192) {
 990         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 991         Unicode path name has to fit in any SMB/CIFS path based frames */
 992                 CIFSMaxBufSize = 8192;
 993         } else if (CIFSMaxBufSize > 1024*127) {
 994                 CIFSMaxBufSize = 1024 * 127;
 995         } else {
 996                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 997         }
 998 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 999         cifs_req_cachep = kmem_cache_create("cifs_request",
1000                                             CIFSMaxBufSize + max_hdr_size, 0,
1001                                             SLAB_HWCACHE_ALIGN, NULL);
1002         if (cifs_req_cachep == NULL)
1003                 return -ENOMEM;
1004
1005         if (cifs_min_rcv < 1)
1006                 cifs_min_rcv = 1;
1007         else if (cifs_min_rcv > 64) {
1008                 cifs_min_rcv = 64;
1009                 cERROR(1, "cifs_min_rcv set to maximum (64)");
1010         }
1011
1012         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1013                                                   cifs_req_cachep);
1014
1015         if (cifs_req_poolp == NULL) {
1016                 kmem_cache_destroy(cifs_req_cachep);
1017                 return -ENOMEM;
1018         }
1019         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1020         almost all handle based requests (but not write response, nor is it
1021         sufficient for path based requests).  A smaller size would have
1022         been more efficient (compacting multiple slab items on one 4k page)
1023         for the case in which debug was on, but this larger size allows
1024         more SMBs to use small buffer alloc and is still much more
1025         efficient to alloc 1 per page off the slab compared to 17K (5page)
1026         alloc of large cifs buffers even when page debugging is on */
1027         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1028                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1029                         NULL);
1030         if (cifs_sm_req_cachep == NULL) {
1031                 mempool_destroy(cifs_req_poolp);
1032                 kmem_cache_destroy(cifs_req_cachep);
1033                 return -ENOMEM;
1034         }
1035
1036         if (cifs_min_small < 2)
1037                 cifs_min_small = 2;
1038         else if (cifs_min_small > 256) {
1039                 cifs_min_small = 256;
1040                 cFYI(1, "cifs_min_small set to maximum (256)");
1041         }
1042
1043         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1044                                                      cifs_sm_req_cachep);
1045
1046         if (cifs_sm_req_poolp == NULL) {
1047                 mempool_destroy(cifs_req_poolp);
1048                 kmem_cache_destroy(cifs_req_cachep);
1049                 kmem_cache_destroy(cifs_sm_req_cachep);
1050                 return -ENOMEM;
1051         }
1052
1053         return 0;
1054 }
1055
1056 static void
1057 cifs_destroy_request_bufs(void)
1058 {
1059         mempool_destroy(cifs_req_poolp);
1060         kmem_cache_destroy(cifs_req_cachep);
1061         mempool_destroy(cifs_sm_req_poolp);
1062         kmem_cache_destroy(cifs_sm_req_cachep);
1063 }
1064
1065 static int
1066 cifs_init_mids(void)
1067 {
1068         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1069                                             sizeof(struct mid_q_entry), 0,
1070                                             SLAB_HWCACHE_ALIGN, NULL);
1071         if (cifs_mid_cachep == NULL)
1072                 return -ENOMEM;
1073
1074         /* 3 is a reasonable minimum number of simultaneous operations */
1075         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1076         if (cifs_mid_poolp == NULL) {
1077                 kmem_cache_destroy(cifs_mid_cachep);
1078                 return -ENOMEM;
1079         }
1080
1081         return 0;
1082 }
1083
1084 static void
1085 cifs_destroy_mids(void)
1086 {
1087         mempool_destroy(cifs_mid_poolp);
1088         kmem_cache_destroy(cifs_mid_cachep);
1089 }
1090
1091 static int __init
1092 init_cifs(void)
1093 {
1094         int rc = 0;
1095         cifs_proc_init();
1096         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1097 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1098         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1099         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1100 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1101 /*
1102  *  Initialize Global counters
1103  */
1104         atomic_set(&sesInfoAllocCount, 0);
1105         atomic_set(&tconInfoAllocCount, 0);
1106         atomic_set(&tcpSesAllocCount, 0);
1107         atomic_set(&tcpSesReconnectCount, 0);
1108         atomic_set(&tconInfoReconnectCount, 0);
1109
1110         atomic_set(&bufAllocCount, 0);
1111         atomic_set(&smBufAllocCount, 0);
1112 #ifdef CONFIG_CIFS_STATS2
1113         atomic_set(&totBufAllocCount, 0);
1114         atomic_set(&totSmBufAllocCount, 0);
1115 #endif /* CONFIG_CIFS_STATS2 */
1116
1117         atomic_set(&midCount, 0);
1118         GlobalCurrentXid = 0;
1119         GlobalTotalActiveXid = 0;
1120         GlobalMaxActiveXid = 0;
1121         spin_lock_init(&cifs_tcp_ses_lock);
1122         spin_lock_init(&cifs_file_list_lock);
1123         spin_lock_init(&GlobalMid_Lock);
1124
1125 #ifdef CONFIG_CIFS_SMB2
1126         get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1127 #endif
1128
1129         if (cifs_max_pending < 2) {
1130                 cifs_max_pending = 2;
1131                 cFYI(1, "cifs_max_pending set to min of 2");
1132         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1133                 cifs_max_pending = CIFS_MAX_REQ;
1134                 cFYI(1, "cifs_max_pending set to max of %u", CIFS_MAX_REQ);
1135         }
1136
1137         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1138         if (!cifsiod_wq) {
1139                 rc = -ENOMEM;
1140                 goto out_clean_proc;
1141         }
1142
1143         rc = cifs_fscache_register();
1144         if (rc)
1145                 goto out_destroy_wq;
1146
1147         rc = cifs_init_inodecache();
1148         if (rc)
1149                 goto out_unreg_fscache;
1150
1151         rc = cifs_init_mids();
1152         if (rc)
1153                 goto out_destroy_inodecache;
1154
1155         rc = cifs_init_request_bufs();
1156         if (rc)
1157                 goto out_destroy_mids;
1158
1159 #ifdef CONFIG_CIFS_UPCALL
1160         rc = register_key_type(&cifs_spnego_key_type);
1161         if (rc)
1162                 goto out_destroy_request_bufs;
1163 #endif /* CONFIG_CIFS_UPCALL */
1164
1165 #ifdef CONFIG_CIFS_ACL
1166         rc = init_cifs_idmap();
1167         if (rc)
1168                 goto out_register_key_type;
1169 #endif /* CONFIG_CIFS_ACL */
1170
1171         rc = register_filesystem(&cifs_fs_type);
1172         if (rc)
1173                 goto out_init_cifs_idmap;
1174
1175         return 0;
1176
1177 out_init_cifs_idmap:
1178 #ifdef CONFIG_CIFS_ACL
1179         exit_cifs_idmap();
1180 out_register_key_type:
1181 #endif
1182 #ifdef CONFIG_CIFS_UPCALL
1183         unregister_key_type(&cifs_spnego_key_type);
1184 out_destroy_request_bufs:
1185 #endif
1186         cifs_destroy_request_bufs();
1187 out_destroy_mids:
1188         cifs_destroy_mids();
1189 out_destroy_inodecache:
1190         cifs_destroy_inodecache();
1191 out_unreg_fscache:
1192         cifs_fscache_unregister();
1193 out_destroy_wq:
1194         destroy_workqueue(cifsiod_wq);
1195 out_clean_proc:
1196         cifs_proc_clean();
1197         return rc;
1198 }
1199
1200 static void __exit
1201 exit_cifs(void)
1202 {
1203         cFYI(DBG2, "exit_cifs");
1204         unregister_filesystem(&cifs_fs_type);
1205         cifs_dfs_release_automount_timer();
1206 #ifdef CONFIG_CIFS_ACL
1207         cifs_destroy_idmaptrees();
1208         exit_cifs_idmap();
1209 #endif
1210 #ifdef CONFIG_CIFS_UPCALL
1211         unregister_key_type(&cifs_spnego_key_type);
1212 #endif
1213         cifs_destroy_request_bufs();
1214         cifs_destroy_mids();
1215         cifs_destroy_inodecache();
1216         cifs_fscache_unregister();
1217         destroy_workqueue(cifsiod_wq);
1218         cifs_proc_clean();
1219 }
1220
1221 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1222 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1223 MODULE_DESCRIPTION
1224     ("VFS to access servers complying with the SNIA CIFS Specification "
1225      "e.g. Samba and Windows");
1226 MODULE_VERSION(CIFS_VERSION);
1227 module_init(init_cifs)
1228 module_exit(exit_cifs)