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