linux/fs/cifs/cifsfs.c
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   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
  56int cifsFYI = 0;
  57int traceSMB = 0;
  58bool enable_oplocks = true;
  59unsigned int linuxExtEnabled = 1;
  60unsigned int lookupCacheEnabled = 1;
  61unsigned int global_secflags = CIFSSEC_DEF;
  62/* unsigned int ntlmv2_support = 0; */
  63unsigned int sign_CIFS_PDUs = 1;
  64static const struct super_operations cifs_super_ops;
  65unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  66module_param(CIFSMaxBufSize, uint, 0);
  67MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  68                                 "Default: 16384 Range: 8192 to 130048");
  69unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  70module_param(cifs_min_rcv, uint, 0);
  71MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  72                                "1 to 64");
  73unsigned int cifs_min_small = 30;
  74module_param(cifs_min_small, uint, 0);
  75MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  76                                 "Range: 2 to 256");
  77unsigned int cifs_max_pending = CIFS_MAX_REQ;
  78module_param(cifs_max_pending, uint, 0444);
  79MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  80                                   "Default: 32767 Range: 2 to 32767.");
  81module_param(enable_oplocks, bool, 0644);
  82MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
  83
  84extern mempool_t *cifs_sm_req_poolp;
  85extern mempool_t *cifs_req_poolp;
  86extern mempool_t *cifs_mid_poolp;
  87
  88struct workqueue_struct *cifsiod_wq;
  89
  90#ifdef CONFIG_CIFS_SMB2
  91__u8 cifs_client_guid[SMB2_CLIENT_GUID_SIZE];
  92#endif
  93
  94/*
  95 * Bumps refcount for cifs super block.
  96 * Note that it should be only called if a referece to VFS super block is
  97 * already held, e.g. in open-type syscalls context. Otherwise it can race with
  98 * atomic_dec_and_test in deactivate_locked_super.
  99 */
 100void
 101cifs_sb_active(struct super_block *sb)
 102{
 103        struct cifs_sb_info *server = CIFS_SB(sb);
 104
 105        if (atomic_inc_return(&server->active) == 1)
 106                atomic_inc(&sb->s_active);
 107}
 108
 109void
 110cifs_sb_deactive(struct super_block *sb)
 111{
 112        struct cifs_sb_info *server = CIFS_SB(sb);
 113
 114        if (atomic_dec_and_test(&server->active))
 115                deactivate_super(sb);
 116}
 117
 118static int
 119cifs_read_super(struct super_block *sb)
 120{
 121        struct inode *inode;
 122        struct cifs_sb_info *cifs_sb;
 123        int rc = 0;
 124
 125        cifs_sb = CIFS_SB(sb);
 126
 127        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
 128                sb->s_flags |= MS_POSIXACL;
 129
 130        if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES)
 131                sb->s_maxbytes = MAX_LFS_FILESIZE;
 132        else
 133                sb->s_maxbytes = MAX_NON_LFS;
 134
 135        /* BB FIXME fix time_gran to be larger for LANMAN sessions */
 136        sb->s_time_gran = 100;
 137
 138        sb->s_magic = CIFS_MAGIC_NUMBER;
 139        sb->s_op = &cifs_super_ops;
 140        sb->s_bdi = &cifs_sb->bdi;
 141        sb->s_blocksize = CIFS_MAX_MSGSIZE;
 142        sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 143        inode = cifs_root_iget(sb);
 144
 145        if (IS_ERR(inode)) {
 146                rc = PTR_ERR(inode);
 147                goto out_no_root;
 148        }
 149
 150        if (cifs_sb_master_tcon(cifs_sb)->nocase)
 151                sb->s_d_op = &cifs_ci_dentry_ops;
 152        else
 153                sb->s_d_op = &cifs_dentry_ops;
 154
 155        sb->s_root = d_make_root(inode);
 156        if (!sb->s_root) {
 157                rc = -ENOMEM;
 158                goto out_no_root;
 159        }
 160
 161#ifdef CONFIG_CIFS_NFSD_EXPORT
 162        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 163                cifs_dbg(FYI, "export ops supported\n");
 164                sb->s_export_op = &cifs_export_ops;
 165        }
 166#endif /* CONFIG_CIFS_NFSD_EXPORT */
 167
 168        return 0;
 169
 170out_no_root:
 171        cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
 172        return rc;
 173}
 174
 175static void cifs_kill_sb(struct super_block *sb)
 176{
 177        struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 178        kill_anon_super(sb);
 179        cifs_umount(cifs_sb);
 180}
 181
 182static int
 183cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 184{
 185        struct super_block *sb = dentry->d_sb;
 186        struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 187        struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 188        struct TCP_Server_Info *server = tcon->ses->server;
 189        unsigned int xid;
 190        int rc = 0;
 191
 192        xid = get_xid();
 193
 194        /*
 195         * PATH_MAX may be too long - it would presumably be total path,
 196         * but note that some servers (includinng Samba 3) have a shorter
 197         * maximum path.
 198         *
 199         * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 200         */
 201        buf->f_namelen = PATH_MAX;
 202        buf->f_files = 0;       /* undefined */
 203        buf->f_ffree = 0;       /* unlimited */
 204
 205        if (server->ops->queryfs)
 206                rc = server->ops->queryfs(xid, tcon, buf);
 207
 208        free_xid(xid);
 209        return 0;
 210}
 211
 212static int cifs_permission(struct inode *inode, int mask)
 213{
 214        struct cifs_sb_info *cifs_sb;
 215
 216        cifs_sb = CIFS_SB(inode->i_sb);
 217
 218        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 219                if ((mask & MAY_EXEC) && !execute_ok(inode))
 220                        return -EACCES;
 221                else
 222                        return 0;
 223        } else /* file mode might have been restricted at mount time
 224                on the client (above and beyond ACL on servers) for
 225                servers which do not support setting and viewing mode bits,
 226                so allowing client to check permissions is useful */
 227                return generic_permission(inode, mask);
 228}
 229
 230static struct kmem_cache *cifs_inode_cachep;
 231static struct kmem_cache *cifs_req_cachep;
 232static struct kmem_cache *cifs_mid_cachep;
 233static struct kmem_cache *cifs_sm_req_cachep;
 234mempool_t *cifs_sm_req_poolp;
 235mempool_t *cifs_req_poolp;
 236mempool_t *cifs_mid_poolp;
 237
 238static struct inode *
 239cifs_alloc_inode(struct super_block *sb)
 240{
 241        struct cifsInodeInfo *cifs_inode;
 242        cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 243        if (!cifs_inode)
 244                return NULL;
 245        cifs_inode->cifsAttrs = 0x20;   /* default */
 246        cifs_inode->time = 0;
 247        /*
 248         * Until the file is open and we have gotten oplock info back from the
 249         * server, can not assume caching of file data or metadata.
 250         */
 251        cifs_set_oplock_level(cifs_inode, 0);
 252        cifs_inode->delete_pending = false;
 253        cifs_inode->invalid_mapping = false;
 254        cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 255        cifs_inode->server_eof = 0;
 256        cifs_inode->uniqueid = 0;
 257        cifs_inode->createtime = 0;
 258#ifdef CONFIG_CIFS_SMB2
 259        get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
 260#endif
 261        /*
 262         * Can not set i_flags here - they get immediately overwritten to zero
 263         * by the VFS.
 264         */
 265        /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
 266        INIT_LIST_HEAD(&cifs_inode->openFileList);
 267        INIT_LIST_HEAD(&cifs_inode->llist);
 268        return &cifs_inode->vfs_inode;
 269}
 270
 271static void cifs_i_callback(struct rcu_head *head)
 272{
 273        struct inode *inode = container_of(head, struct inode, i_rcu);
 274        kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 275}
 276
 277static void
 278cifs_destroy_inode(struct inode *inode)
 279{
 280        call_rcu(&inode->i_rcu, cifs_i_callback);
 281}
 282
 283static void
 284cifs_evict_inode(struct inode *inode)
 285{
 286        truncate_inode_pages(&inode->i_data, 0);
 287        clear_inode(inode);
 288        cifs_fscache_release_inode_cookie(inode);
 289}
 290
 291static void
 292cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 293{
 294        struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 295        struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 296
 297        seq_printf(s, ",addr=");
 298
 299        switch (server->dstaddr.ss_family) {
 300        case AF_INET:
 301                seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 302                break;
 303        case AF_INET6:
 304                seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 305                if (sa6->sin6_scope_id)
 306                        seq_printf(s, "%%%u", sa6->sin6_scope_id);
 307                break;
 308        default:
 309                seq_printf(s, "(unknown)");
 310        }
 311}
 312
 313static void
 314cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
 315{
 316        if (ses->sectype == Unspecified)
 317                return;
 318
 319        seq_printf(s, ",sec=");
 320
 321        switch (ses->sectype) {
 322        case LANMAN:
 323                seq_printf(s, "lanman");
 324                break;
 325        case NTLMv2:
 326                seq_printf(s, "ntlmv2");
 327                break;
 328        case NTLM:
 329                seq_printf(s, "ntlm");
 330                break;
 331        case Kerberos:
 332                seq_printf(s, "krb5");
 333                break;
 334        case RawNTLMSSP:
 335                seq_printf(s, "ntlmssp");
 336                break;
 337        default:
 338                /* shouldn't ever happen */
 339                seq_printf(s, "unknown");
 340                break;
 341        }
 342
 343        if (ses->sign)
 344                seq_printf(s, "i");
 345}
 346
 347static void
 348cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
 349{
 350        seq_printf(s, ",cache=");
 351
 352        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
 353                seq_printf(s, "strict");
 354        else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 355                seq_printf(s, "none");
 356        else
 357                seq_printf(s, "loose");
 358}
 359
 360/*
 361 * cifs_show_options() is for displaying mount options in /proc/mounts.
 362 * Not all settable options are displayed but most of the important
 363 * ones are.
 364 */
 365static int
 366cifs_show_options(struct seq_file *s, struct dentry *root)
 367{
 368        struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
 369        struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 370        struct sockaddr *srcaddr;
 371        srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 372
 373        seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
 374        cifs_show_security(s, tcon->ses);
 375        cifs_show_cache_flavor(s, cifs_sb);
 376
 377        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 378                seq_printf(s, ",multiuser");
 379        else if (tcon->ses->user_name)
 380                seq_printf(s, ",username=%s", tcon->ses->user_name);
 381
 382        if (tcon->ses->domainName)
 383                seq_printf(s, ",domain=%s", tcon->ses->domainName);
 384
 385        if (srcaddr->sa_family != AF_UNSPEC) {
 386                struct sockaddr_in *saddr4;
 387                struct sockaddr_in6 *saddr6;
 388                saddr4 = (struct sockaddr_in *)srcaddr;
 389                saddr6 = (struct sockaddr_in6 *)srcaddr;
 390                if (srcaddr->sa_family == AF_INET6)
 391                        seq_printf(s, ",srcaddr=%pI6c",
 392                                   &saddr6->sin6_addr);
 393                else if (srcaddr->sa_family == AF_INET)
 394                        seq_printf(s, ",srcaddr=%pI4",
 395                                   &saddr4->sin_addr.s_addr);
 396                else
 397                        seq_printf(s, ",srcaddr=BAD-AF:%i",
 398                                   (int)(srcaddr->sa_family));
 399        }
 400
 401        seq_printf(s, ",uid=%u",
 402                   from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
 403        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 404                seq_printf(s, ",forceuid");
 405        else
 406                seq_printf(s, ",noforceuid");
 407
 408        seq_printf(s, ",gid=%u",
 409                   from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
 410        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 411                seq_printf(s, ",forcegid");
 412        else
 413                seq_printf(s, ",noforcegid");
 414
 415        cifs_show_address(s, tcon->ses->server);
 416
 417        if (!tcon->unix_ext)
 418                seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 419                                           cifs_sb->mnt_file_mode,
 420                                           cifs_sb->mnt_dir_mode);
 421        if (tcon->seal)
 422                seq_printf(s, ",seal");
 423        if (tcon->nocase)
 424                seq_printf(s, ",nocase");
 425        if (tcon->retry)
 426                seq_printf(s, ",hard");
 427        if (tcon->unix_ext)
 428                seq_printf(s, ",unix");
 429        else
 430                seq_printf(s, ",nounix");
 431        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 432                seq_printf(s, ",posixpaths");
 433        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 434                seq_printf(s, ",setuids");
 435        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 436                seq_printf(s, ",serverino");
 437        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 438                seq_printf(s, ",rwpidforward");
 439        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 440                seq_printf(s, ",forcemand");
 441        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 442                seq_printf(s, ",nouser_xattr");
 443        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 444                seq_printf(s, ",mapchars");
 445        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 446                seq_printf(s, ",sfu");
 447        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 448                seq_printf(s, ",nobrl");
 449        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 450                seq_printf(s, ",cifsacl");
 451        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 452                seq_printf(s, ",dynperm");
 453        if (root->d_sb->s_flags & MS_POSIXACL)
 454                seq_printf(s, ",acl");
 455        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 456                seq_printf(s, ",mfsymlinks");
 457        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 458                seq_printf(s, ",fsc");
 459        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 460                seq_printf(s, ",nostrictsync");
 461        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 462                seq_printf(s, ",noperm");
 463        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 464                seq_printf(s, ",backupuid=%u",
 465                           from_kuid_munged(&init_user_ns,
 466                                            cifs_sb->mnt_backupuid));
 467        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 468                seq_printf(s, ",backupgid=%u",
 469                           from_kgid_munged(&init_user_ns,
 470                                            cifs_sb->mnt_backupgid));
 471
 472        seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 473        seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 474        /* convert actimeo and display it in seconds */
 475        seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 476
 477        return 0;
 478}
 479
 480static void cifs_umount_begin(struct super_block *sb)
 481{
 482        struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 483        struct cifs_tcon *tcon;
 484
 485        if (cifs_sb == NULL)
 486                return;
 487
 488        tcon = cifs_sb_master_tcon(cifs_sb);
 489
 490        spin_lock(&cifs_tcp_ses_lock);
 491        if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 492                /* we have other mounts to same share or we have
 493                   already tried to force umount this and woken up
 494                   all waiting network requests, nothing to do */
 495                spin_unlock(&cifs_tcp_ses_lock);
 496                return;
 497        } else if (tcon->tc_count == 1)
 498                tcon->tidStatus = CifsExiting;
 499        spin_unlock(&cifs_tcp_ses_lock);
 500
 501        /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 502        /* cancel_notify_requests(tcon); */
 503        if (tcon->ses && tcon->ses->server) {
 504                cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
 505                wake_up_all(&tcon->ses->server->request_q);
 506                wake_up_all(&tcon->ses->server->response_q);
 507                msleep(1); /* yield */
 508                /* we have to kick the requests once more */
 509                wake_up_all(&tcon->ses->server->response_q);
 510                msleep(1);
 511        }
 512
 513        return;
 514}
 515
 516#ifdef CONFIG_CIFS_STATS2
 517static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 518{
 519        /* BB FIXME */
 520        return 0;
 521}
 522#endif
 523
 524static int cifs_remount(struct super_block *sb, int *flags, char *data)
 525{
 526        *flags |= MS_NODIRATIME;
 527        return 0;
 528}
 529
 530static int cifs_drop_inode(struct inode *inode)
 531{
 532        struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 533
 534        /* no serverino => unconditional eviction */
 535        return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 536                generic_drop_inode(inode);
 537}
 538
 539static const struct super_operations cifs_super_ops = {
 540        .statfs = cifs_statfs,
 541        .alloc_inode = cifs_alloc_inode,
 542        .destroy_inode = cifs_destroy_inode,
 543        .drop_inode     = cifs_drop_inode,
 544        .evict_inode    = cifs_evict_inode,
 545/*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 546        function unless later we add lazy close of inodes or unless the
 547        kernel forgets to call us with the same number of releases (closes)
 548        as opens */
 549        .show_options = cifs_show_options,
 550        .umount_begin   = cifs_umount_begin,
 551        .remount_fs = cifs_remount,
 552#ifdef CONFIG_CIFS_STATS2
 553        .show_stats = cifs_show_stats,
 554#endif
 555};
 556
 557/*
 558 * Get root dentry from superblock according to prefix path mount option.
 559 * Return dentry with refcount + 1 on success and NULL otherwise.
 560 */
 561static struct dentry *
 562cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 563{
 564        struct dentry *dentry;
 565        struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 566        char *full_path = NULL;
 567        char *s, *p;
 568        char sep;
 569
 570        full_path = cifs_build_path_to_root(vol, cifs_sb,
 571                                            cifs_sb_master_tcon(cifs_sb));
 572        if (full_path == NULL)
 573                return ERR_PTR(-ENOMEM);
 574
 575        cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
 576
 577        sep = CIFS_DIR_SEP(cifs_sb);
 578        dentry = dget(sb->s_root);
 579        p = s = full_path;
 580
 581        do {
 582                struct inode *dir = dentry->d_inode;
 583                struct dentry *child;
 584
 585                if (!dir) {
 586                        dput(dentry);
 587                        dentry = ERR_PTR(-ENOENT);
 588                        break;
 589                }
 590                if (!S_ISDIR(dir->i_mode)) {
 591                        dput(dentry);
 592                        dentry = ERR_PTR(-ENOTDIR);
 593                        break;
 594                }
 595
 596                /* skip separators */
 597                while (*s == sep)
 598                        s++;
 599                if (!*s)
 600                        break;
 601                p = s++;
 602                /* next separator */
 603                while (*s && *s != sep)
 604                        s++;
 605
 606                mutex_lock(&dir->i_mutex);
 607                child = lookup_one_len(p, dentry, s - p);
 608                mutex_unlock(&dir->i_mutex);
 609                dput(dentry);
 610                dentry = child;
 611        } while (!IS_ERR(dentry));
 612        kfree(full_path);
 613        return dentry;
 614}
 615
 616static int cifs_set_super(struct super_block *sb, void *data)
 617{
 618        struct cifs_mnt_data *mnt_data = data;
 619        sb->s_fs_info = mnt_data->cifs_sb;
 620        return set_anon_super(sb, NULL);
 621}
 622
 623static struct dentry *
 624cifs_do_mount(struct file_system_type *fs_type,
 625              int flags, const char *dev_name, void *data)
 626{
 627        int rc;
 628        struct super_block *sb;
 629        struct cifs_sb_info *cifs_sb;
 630        struct smb_vol *volume_info;
 631        struct cifs_mnt_data mnt_data;
 632        struct dentry *root;
 633
 634        cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
 635
 636        volume_info = cifs_get_volume_info((char *)data, dev_name);
 637        if (IS_ERR(volume_info))
 638                return ERR_CAST(volume_info);
 639
 640        cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 641        if (cifs_sb == NULL) {
 642                root = ERR_PTR(-ENOMEM);
 643                goto out_nls;
 644        }
 645
 646        cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 647        if (cifs_sb->mountdata == NULL) {
 648                root = ERR_PTR(-ENOMEM);
 649                goto out_cifs_sb;
 650        }
 651
 652        cifs_setup_cifs_sb(volume_info, cifs_sb);
 653
 654        rc = cifs_mount(cifs_sb, volume_info);
 655        if (rc) {
 656                if (!(flags & MS_SILENT))
 657                        cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
 658                                 rc);
 659                root = ERR_PTR(rc);
 660                goto out_mountdata;
 661        }
 662
 663        mnt_data.vol = volume_info;
 664        mnt_data.cifs_sb = cifs_sb;
 665        mnt_data.flags = flags;
 666
 667        /* BB should we make this contingent on mount parm? */
 668        flags |= MS_NODIRATIME | MS_NOATIME;
 669
 670        sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 671        if (IS_ERR(sb)) {
 672                root = ERR_CAST(sb);
 673                cifs_umount(cifs_sb);
 674                goto out;
 675        }
 676
 677        if (sb->s_root) {
 678                cifs_dbg(FYI, "Use existing superblock\n");
 679                cifs_umount(cifs_sb);
 680        } else {
 681                rc = cifs_read_super(sb);
 682                if (rc) {
 683                        root = ERR_PTR(rc);
 684                        goto out_super;
 685                }
 686
 687                sb->s_flags |= MS_ACTIVE;
 688        }
 689
 690        root = cifs_get_root(volume_info, sb);
 691        if (IS_ERR(root))
 692                goto out_super;
 693
 694        cifs_dbg(FYI, "dentry root is: %p\n", root);
 695        goto out;
 696
 697out_super:
 698        deactivate_locked_super(sb);
 699out:
 700        cifs_cleanup_volume_info(volume_info);
 701        return root;
 702
 703out_mountdata:
 704        kfree(cifs_sb->mountdata);
 705out_cifs_sb:
 706        kfree(cifs_sb);
 707out_nls:
 708        unload_nls(volume_info->local_nls);
 709        goto out;
 710}
 711
 712static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 713                                   unsigned long nr_segs, loff_t pos)
 714{
 715        struct inode *inode = file_inode(iocb->ki_filp);
 716        ssize_t written;
 717        int rc;
 718
 719        written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 720
 721        if (CIFS_I(inode)->clientCanCacheAll)
 722                return written;
 723
 724        rc = filemap_fdatawrite(inode->i_mapping);
 725        if (rc)
 726                cifs_dbg(FYI, "cifs_file_aio_write: %d rc on %p inode\n",
 727                         rc, inode);
 728
 729        return written;
 730}
 731
 732static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
 733{
 734        /*
 735         * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 736         * the cached file length
 737         */
 738        if (whence != SEEK_SET && whence != SEEK_CUR) {
 739                int rc;
 740                struct inode *inode = file_inode(file);
 741
 742                /*
 743                 * We need to be sure that all dirty pages are written and the
 744                 * server has the newest file length.
 745                 */
 746                if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
 747                    inode->i_mapping->nrpages != 0) {
 748                        rc = filemap_fdatawait(inode->i_mapping);
 749                        if (rc) {
 750                                mapping_set_error(inode->i_mapping, rc);
 751                                return rc;
 752                        }
 753                }
 754                /*
 755                 * Some applications poll for the file length in this strange
 756                 * way so we must seek to end on non-oplocked files by
 757                 * setting the revalidate time to zero.
 758                 */
 759                CIFS_I(inode)->time = 0;
 760
 761                rc = cifs_revalidate_file_attr(file);
 762                if (rc < 0)
 763                        return (loff_t)rc;
 764        }
 765        return generic_file_llseek(file, offset, whence);
 766}
 767
 768static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 769{
 770        /* note that this is called by vfs setlease with i_lock held
 771           to protect *lease from going away */
 772        struct inode *inode = file_inode(file);
 773        struct cifsFileInfo *cfile = file->private_data;
 774
 775        if (!(S_ISREG(inode->i_mode)))
 776                return -EINVAL;
 777
 778        /* check if file is oplocked */
 779        if (((arg == F_RDLCK) &&
 780                (CIFS_I(inode)->clientCanCacheRead)) ||
 781            ((arg == F_WRLCK) &&
 782                (CIFS_I(inode)->clientCanCacheAll)))
 783                return generic_setlease(file, arg, lease);
 784        else if (tlink_tcon(cfile->tlink)->local_lease &&
 785                 !CIFS_I(inode)->clientCanCacheRead)
 786                /* If the server claims to support oplock on this
 787                   file, then we still need to check oplock even
 788                   if the local_lease mount option is set, but there
 789                   are servers which do not support oplock for which
 790                   this mount option may be useful if the user
 791                   knows that the file won't be changed on the server
 792                   by anyone else */
 793                return generic_setlease(file, arg, lease);
 794        else
 795                return -EAGAIN;
 796}
 797
 798struct file_system_type cifs_fs_type = {
 799        .owner = THIS_MODULE,
 800        .name = "cifs",
 801        .mount = cifs_do_mount,
 802        .kill_sb = cifs_kill_sb,
 803        /*  .fs_flags */
 804};
 805MODULE_ALIAS_FS("cifs");
 806const struct inode_operations cifs_dir_inode_ops = {
 807        .create = cifs_create,
 808        .atomic_open = cifs_atomic_open,
 809        .lookup = cifs_lookup,
 810        .getattr = cifs_getattr,
 811        .unlink = cifs_unlink,
 812        .link = cifs_hardlink,
 813        .mkdir = cifs_mkdir,
 814        .rmdir = cifs_rmdir,
 815        .rename = cifs_rename,
 816        .permission = cifs_permission,
 817/*      revalidate:cifs_revalidate,   */
 818        .setattr = cifs_setattr,
 819        .symlink = cifs_symlink,
 820        .mknod   = cifs_mknod,
 821#ifdef CONFIG_CIFS_XATTR
 822        .setxattr = cifs_setxattr,
 823        .getxattr = cifs_getxattr,
 824        .listxattr = cifs_listxattr,
 825        .removexattr = cifs_removexattr,
 826#endif
 827};
 828
 829const struct inode_operations cifs_file_inode_ops = {
 830/*      revalidate:cifs_revalidate, */
 831        .setattr = cifs_setattr,
 832        .getattr = cifs_getattr, /* do we need this anymore? */
 833        .rename = cifs_rename,
 834        .permission = cifs_permission,
 835#ifdef CONFIG_CIFS_XATTR
 836        .setxattr = cifs_setxattr,
 837        .getxattr = cifs_getxattr,
 838        .listxattr = cifs_listxattr,
 839        .removexattr = cifs_removexattr,
 840#endif
 841};
 842
 843const struct inode_operations cifs_symlink_inode_ops = {
 844        .readlink = generic_readlink,
 845        .follow_link = cifs_follow_link,
 846        .put_link = cifs_put_link,
 847        .permission = cifs_permission,
 848        /* BB add the following two eventually */
 849        /* revalidate: cifs_revalidate,
 850           setattr:    cifs_notify_change, *//* BB do we need notify change */
 851#ifdef CONFIG_CIFS_XATTR
 852        .setxattr = cifs_setxattr,
 853        .getxattr = cifs_getxattr,
 854        .listxattr = cifs_listxattr,
 855        .removexattr = cifs_removexattr,
 856#endif
 857};
 858
 859const struct file_operations cifs_file_ops = {
 860        .read = do_sync_read,
 861        .write = do_sync_write,
 862        .aio_read = generic_file_aio_read,
 863        .aio_write = cifs_file_aio_write,
 864        .open = cifs_open,
 865        .release = cifs_close,
 866        .lock = cifs_lock,
 867        .fsync = cifs_fsync,
 868        .flush = cifs_flush,
 869        .mmap  = cifs_file_mmap,
 870        .splice_read = generic_file_splice_read,
 871        .llseek = cifs_llseek,
 872#ifdef CONFIG_CIFS_POSIX
 873        .unlocked_ioctl = cifs_ioctl,
 874#endif /* CONFIG_CIFS_POSIX */
 875        .setlease = cifs_setlease,
 876};
 877
 878const struct file_operations cifs_file_strict_ops = {
 879        .read = do_sync_read,
 880        .write = do_sync_write,
 881        .aio_read = cifs_strict_readv,
 882        .aio_write = cifs_strict_writev,
 883        .open = cifs_open,
 884        .release = cifs_close,
 885        .lock = cifs_lock,
 886        .fsync = cifs_strict_fsync,
 887        .flush = cifs_flush,
 888        .mmap = cifs_file_strict_mmap,
 889        .splice_read = generic_file_splice_read,
 890        .llseek = cifs_llseek,
 891#ifdef CONFIG_CIFS_POSIX
 892        .unlocked_ioctl = cifs_ioctl,
 893#endif /* CONFIG_CIFS_POSIX */
 894        .setlease = cifs_setlease,
 895};
 896
 897const struct file_operations cifs_file_direct_ops = {
 898        /* BB reevaluate whether they can be done with directio, no cache */
 899        .read = do_sync_read,
 900        .write = do_sync_write,
 901        .aio_read = cifs_user_readv,
 902        .aio_write = cifs_user_writev,
 903        .open = cifs_open,
 904        .release = cifs_close,
 905        .lock = cifs_lock,
 906        .fsync = cifs_fsync,
 907        .flush = cifs_flush,
 908        .mmap = cifs_file_mmap,
 909        .splice_read = generic_file_splice_read,
 910#ifdef CONFIG_CIFS_POSIX
 911        .unlocked_ioctl  = cifs_ioctl,
 912#endif /* CONFIG_CIFS_POSIX */
 913        .llseek = cifs_llseek,
 914        .setlease = cifs_setlease,
 915};
 916
 917const struct file_operations cifs_file_nobrl_ops = {
 918        .read = do_sync_read,
 919        .write = do_sync_write,
 920        .aio_read = generic_file_aio_read,
 921        .aio_write = cifs_file_aio_write,
 922        .open = cifs_open,
 923        .release = cifs_close,
 924        .fsync = cifs_fsync,
 925        .flush = cifs_flush,
 926        .mmap  = cifs_file_mmap,
 927        .splice_read = generic_file_splice_read,
 928        .llseek = cifs_llseek,
 929#ifdef CONFIG_CIFS_POSIX
 930        .unlocked_ioctl = cifs_ioctl,
 931#endif /* CONFIG_CIFS_POSIX */
 932        .setlease = cifs_setlease,
 933};
 934
 935const struct file_operations cifs_file_strict_nobrl_ops = {
 936        .read = do_sync_read,
 937        .write = do_sync_write,
 938        .aio_read = cifs_strict_readv,
 939        .aio_write = cifs_strict_writev,
 940        .open = cifs_open,
 941        .release = cifs_close,
 942        .fsync = cifs_strict_fsync,
 943        .flush = cifs_flush,
 944        .mmap = cifs_file_strict_mmap,
 945        .splice_read = generic_file_splice_read,
 946        .llseek = cifs_llseek,
 947#ifdef CONFIG_CIFS_POSIX
 948        .unlocked_ioctl = cifs_ioctl,
 949#endif /* CONFIG_CIFS_POSIX */
 950        .setlease = cifs_setlease,
 951};
 952
 953const struct file_operations cifs_file_direct_nobrl_ops = {
 954        /* BB reevaluate whether they can be done with directio, no cache */
 955        .read = do_sync_read,
 956        .write = do_sync_write,
 957        .aio_read = cifs_user_readv,
 958        .aio_write = cifs_user_writev,
 959        .open = cifs_open,
 960        .release = cifs_close,
 961        .fsync = cifs_fsync,
 962        .flush = cifs_flush,
 963        .mmap = cifs_file_mmap,
 964        .splice_read = generic_file_splice_read,
 965#ifdef CONFIG_CIFS_POSIX
 966        .unlocked_ioctl  = cifs_ioctl,
 967#endif /* CONFIG_CIFS_POSIX */
 968        .llseek = cifs_llseek,
 969        .setlease = cifs_setlease,
 970};
 971
 972const struct file_operations cifs_dir_ops = {
 973        .iterate = cifs_readdir,
 974        .release = cifs_closedir,
 975        .read    = generic_read_dir,
 976        .unlocked_ioctl  = cifs_ioctl,
 977        .llseek = generic_file_llseek,
 978};
 979
 980static void
 981cifs_init_once(void *inode)
 982{
 983        struct cifsInodeInfo *cifsi = inode;
 984
 985        inode_init_once(&cifsi->vfs_inode);
 986        init_rwsem(&cifsi->lock_sem);
 987}
 988
 989static int
 990cifs_init_inodecache(void)
 991{
 992        cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 993                                              sizeof(struct cifsInodeInfo),
 994                                              0, (SLAB_RECLAIM_ACCOUNT|
 995                                                SLAB_MEM_SPREAD),
 996                                              cifs_init_once);
 997        if (cifs_inode_cachep == NULL)
 998                return -ENOMEM;
 999
1000        return 0;
1001}
1002
1003static void
1004cifs_destroy_inodecache(void)
1005{
1006        /*
1007         * Make sure all delayed rcu free inodes are flushed before we
1008         * destroy cache.
1009         */
1010        rcu_barrier();
1011        kmem_cache_destroy(cifs_inode_cachep);
1012}
1013
1014static int
1015cifs_init_request_bufs(void)
1016{
1017        size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1018#ifdef CONFIG_CIFS_SMB2
1019        /*
1020         * SMB2 maximum header size is bigger than CIFS one - no problems to
1021         * allocate some more bytes for CIFS.
1022         */
1023        max_hdr_size = MAX_SMB2_HDR_SIZE;
1024#endif
1025        if (CIFSMaxBufSize < 8192) {
1026        /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1027        Unicode path name has to fit in any SMB/CIFS path based frames */
1028                CIFSMaxBufSize = 8192;
1029        } else if (CIFSMaxBufSize > 1024*127) {
1030                CIFSMaxBufSize = 1024 * 127;
1031        } else {
1032                CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1033        }
1034/*
1035        cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1036                 CIFSMaxBufSize, CIFSMaxBufSize);
1037*/
1038        cifs_req_cachep = kmem_cache_create("cifs_request",
1039                                            CIFSMaxBufSize + max_hdr_size, 0,
1040                                            SLAB_HWCACHE_ALIGN, NULL);
1041        if (cifs_req_cachep == NULL)
1042                return -ENOMEM;
1043
1044        if (cifs_min_rcv < 1)
1045                cifs_min_rcv = 1;
1046        else if (cifs_min_rcv > 64) {
1047                cifs_min_rcv = 64;
1048                cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1049        }
1050
1051        cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1052                                                  cifs_req_cachep);
1053
1054        if (cifs_req_poolp == NULL) {
1055                kmem_cache_destroy(cifs_req_cachep);
1056                return -ENOMEM;
1057        }
1058        /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1059        almost all handle based requests (but not write response, nor is it
1060        sufficient for path based requests).  A smaller size would have
1061        been more efficient (compacting multiple slab items on one 4k page)
1062        for the case in which debug was on, but this larger size allows
1063        more SMBs to use small buffer alloc and is still much more
1064        efficient to alloc 1 per page off the slab compared to 17K (5page)
1065        alloc of large cifs buffers even when page debugging is on */
1066        cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1067                        MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1068                        NULL);
1069        if (cifs_sm_req_cachep == NULL) {
1070                mempool_destroy(cifs_req_poolp);
1071                kmem_cache_destroy(cifs_req_cachep);
1072                return -ENOMEM;
1073        }
1074
1075        if (cifs_min_small < 2)
1076                cifs_min_small = 2;
1077        else if (cifs_min_small > 256) {
1078                cifs_min_small = 256;
1079                cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1080        }
1081
1082        cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1083                                                     cifs_sm_req_cachep);
1084
1085        if (cifs_sm_req_poolp == NULL) {
1086                mempool_destroy(cifs_req_poolp);
1087                kmem_cache_destroy(cifs_req_cachep);
1088                kmem_cache_destroy(cifs_sm_req_cachep);
1089                return -ENOMEM;
1090        }
1091
1092        return 0;
1093}
1094
1095static void
1096cifs_destroy_request_bufs(void)
1097{
1098        mempool_destroy(cifs_req_poolp);
1099        kmem_cache_destroy(cifs_req_cachep);
1100        mempool_destroy(cifs_sm_req_poolp);
1101        kmem_cache_destroy(cifs_sm_req_cachep);
1102}
1103
1104static int
1105cifs_init_mids(void)
1106{
1107        cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1108                                            sizeof(struct mid_q_entry), 0,
1109                                            SLAB_HWCACHE_ALIGN, NULL);
1110        if (cifs_mid_cachep == NULL)
1111                return -ENOMEM;
1112
1113        /* 3 is a reasonable minimum number of simultaneous operations */
1114        cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1115        if (cifs_mid_poolp == NULL) {
1116                kmem_cache_destroy(cifs_mid_cachep);
1117                return -ENOMEM;
1118        }
1119
1120        return 0;
1121}
1122
1123static void
1124cifs_destroy_mids(void)
1125{
1126        mempool_destroy(cifs_mid_poolp);
1127        kmem_cache_destroy(cifs_mid_cachep);
1128}
1129
1130static int __init
1131init_cifs(void)
1132{
1133        int rc = 0;
1134        cifs_proc_init();
1135        INIT_LIST_HEAD(&cifs_tcp_ses_list);
1136#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1137        INIT_LIST_HEAD(&GlobalDnotifyReqList);
1138        INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1139#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1140/*
1141 *  Initialize Global counters
1142 */
1143        atomic_set(&sesInfoAllocCount, 0);
1144        atomic_set(&tconInfoAllocCount, 0);
1145        atomic_set(&tcpSesAllocCount, 0);
1146        atomic_set(&tcpSesReconnectCount, 0);
1147        atomic_set(&tconInfoReconnectCount, 0);
1148
1149        atomic_set(&bufAllocCount, 0);
1150        atomic_set(&smBufAllocCount, 0);
1151#ifdef CONFIG_CIFS_STATS2
1152        atomic_set(&totBufAllocCount, 0);
1153        atomic_set(&totSmBufAllocCount, 0);
1154#endif /* CONFIG_CIFS_STATS2 */
1155
1156        atomic_set(&midCount, 0);
1157        GlobalCurrentXid = 0;
1158        GlobalTotalActiveXid = 0;
1159        GlobalMaxActiveXid = 0;
1160        spin_lock_init(&cifs_tcp_ses_lock);
1161        spin_lock_init(&cifs_file_list_lock);
1162        spin_lock_init(&GlobalMid_Lock);
1163
1164#ifdef CONFIG_CIFS_SMB2
1165        get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1166#endif
1167
1168        if (cifs_max_pending < 2) {
1169                cifs_max_pending = 2;
1170                cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1171        } else if (cifs_max_pending > CIFS_MAX_REQ) {
1172                cifs_max_pending = CIFS_MAX_REQ;
1173                cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1174                         CIFS_MAX_REQ);
1175        }
1176
1177        cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1178        if (!cifsiod_wq) {
1179                rc = -ENOMEM;
1180                goto out_clean_proc;
1181        }
1182
1183        rc = cifs_fscache_register();
1184        if (rc)
1185                goto out_destroy_wq;
1186
1187        rc = cifs_init_inodecache();
1188        if (rc)
1189                goto out_unreg_fscache;
1190
1191        rc = cifs_init_mids();
1192        if (rc)
1193                goto out_destroy_inodecache;
1194
1195        rc = cifs_init_request_bufs();
1196        if (rc)
1197                goto out_destroy_mids;
1198
1199#ifdef CONFIG_CIFS_UPCALL
1200        rc = register_key_type(&cifs_spnego_key_type);
1201        if (rc)
1202                goto out_destroy_request_bufs;
1203#endif /* CONFIG_CIFS_UPCALL */
1204
1205#ifdef CONFIG_CIFS_ACL
1206        rc = init_cifs_idmap();
1207        if (rc)
1208                goto out_register_key_type;
1209#endif /* CONFIG_CIFS_ACL */
1210
1211        rc = register_filesystem(&cifs_fs_type);
1212        if (rc)
1213                goto out_init_cifs_idmap;
1214
1215        return 0;
1216
1217out_init_cifs_idmap:
1218#ifdef CONFIG_CIFS_ACL
1219        exit_cifs_idmap();
1220out_register_key_type:
1221#endif
1222#ifdef CONFIG_CIFS_UPCALL
1223        unregister_key_type(&cifs_spnego_key_type);
1224out_destroy_request_bufs:
1225#endif
1226        cifs_destroy_request_bufs();
1227out_destroy_mids:
1228        cifs_destroy_mids();
1229out_destroy_inodecache:
1230        cifs_destroy_inodecache();
1231out_unreg_fscache:
1232        cifs_fscache_unregister();
1233out_destroy_wq:
1234        destroy_workqueue(cifsiod_wq);
1235out_clean_proc:
1236        cifs_proc_clean();
1237        return rc;
1238}
1239
1240static void __exit
1241exit_cifs(void)
1242{
1243        cifs_dbg(NOISY, "exit_cifs\n");
1244        unregister_filesystem(&cifs_fs_type);
1245        cifs_dfs_release_automount_timer();
1246#ifdef CONFIG_CIFS_ACL
1247        exit_cifs_idmap();
1248#endif
1249#ifdef CONFIG_CIFS_UPCALL
1250        unregister_key_type(&cifs_spnego_key_type);
1251#endif
1252        cifs_destroy_request_bufs();
1253        cifs_destroy_mids();
1254        cifs_destroy_inodecache();
1255        cifs_fscache_unregister();
1256        destroy_workqueue(cifsiod_wq);
1257        cifs_proc_clean();
1258}
1259
1260MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1261MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1262MODULE_DESCRIPTION
1263    ("VFS to access servers complying with the SNIA CIFS Specification "
1264     "e.g. Samba and Windows");
1265MODULE_VERSION(CIFS_VERSION);
1266module_init(init_cifs)
1267module_exit(exit_cifs)
1268
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