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 /*
  91  * Bumps refcount for cifs super block.
  92  * Note that it should be only called if a referece to VFS super block is
  93  * already held, e.g. in open-type syscalls context. Otherwise it can race with
  94  * atomic_dec_and_test in deactivate_locked_super.
  95  */
  96 void
  97 cifs_sb_active(struct super_block *sb)
  98 {
  99         struct cifs_sb_info *server = CIFS_SB(sb);
 100
 101         if (atomic_inc_return(&server->active) == 1)
 102                 atomic_inc(&sb->s_active);
 103 }
 104
 105 void
 106 cifs_sb_deactive(struct super_block *sb)
 107 {
 108         struct cifs_sb_info *server = CIFS_SB(sb);
 109
 110         if (atomic_dec_and_test(&server->active))
 111                 deactivate_super(sb);
 112 }
 113
 114 static int
 115 cifs_read_super(struct super_block *sb)
 116 {
 117         struct inode *inode;
 118         struct cifs_sb_info *cifs_sb;
 119         struct cifs_tcon *tcon;
 120         int rc = 0;
 121
 122         cifs_sb = CIFS_SB(sb);
 123         tcon = cifs_sb_master_tcon(cifs_sb);
 124
 125         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
 126                 sb->s_flags |= MS_POSIXACL;
 127
 128         if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
 129                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 130         else
 131                 sb->s_maxbytes = MAX_NON_LFS;
 132
 133         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
 134         sb->s_time_gran = 100;
 135
 136         sb->s_magic = CIFS_MAGIC_NUMBER;
 137         sb->s_op = &cifs_super_ops;
 138         sb->s_bdi = &cifs_sb->bdi;
 139         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 140         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 141         inode = cifs_root_iget(sb);
 142
 143         if (IS_ERR(inode)) {
 144                 rc = PTR_ERR(inode);
 145                 goto out_no_root;
 146         }
 147
 148         if (tcon->nocase)
 149                 sb->s_d_op = &cifs_ci_dentry_ops;
 150         else
 151                 sb->s_d_op = &cifs_dentry_ops;
 152
 153         sb->s_root = d_make_root(inode);
 154         if (!sb->s_root) {
 155                 rc = -ENOMEM;
 156                 goto out_no_root;
 157         }
 158
 159 #ifdef CONFIG_CIFS_NFSD_EXPORT
 160         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 161                 cifs_dbg(FYI, "export ops supported\n");
 162                 sb->s_export_op = &cifs_export_ops;
 163         }
 164 #endif /* CONFIG_CIFS_NFSD_EXPORT */
 165
 166         return 0;
 167
 168 out_no_root:
 169         cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
 170         return rc;
 171 }
 172
 173 static void cifs_kill_sb(struct super_block *sb)
 174 {
 175         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 176         kill_anon_super(sb);
 177         cifs_umount(cifs_sb);
 178 }
 179
 180 static int
 181 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 182 {
 183         struct super_block *sb = dentry->d_sb;
 184         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 185         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 186         struct TCP_Server_Info *server = tcon->ses->server;
 187         unsigned int xid;
 188         int rc = 0;
 189
 190         xid = get_xid();
 191
 192         /*
 193          * PATH_MAX may be too long - it would presumably be total path,
 194          * but note that some servers (includinng Samba 3) have a shorter
 195          * maximum path.
 196          *
 197          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 198          */
 199         buf->f_namelen = PATH_MAX;
 200         buf->f_files = 0;       /* undefined */
 201         buf->f_ffree = 0;       /* unlimited */
 202
 203         if (server->ops->queryfs)
 204                 rc = server->ops->queryfs(xid, tcon, buf);
 205
 206         free_xid(xid);
 207         return 0;
 208 }
 209
 210 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
 211 {
 212         struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
 213         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 214         struct TCP_Server_Info *server = tcon->ses->server;
 215
 216         if (server->ops->fallocate)
 217                 return server->ops->fallocate(file, tcon, mode, off, len);
 218
 219         return -EOPNOTSUPP;
 220 }
 221
 222 static int cifs_permission(struct inode *inode, int mask)
 223 {
 224         struct cifs_sb_info *cifs_sb;
 225
 226         cifs_sb = CIFS_SB(inode->i_sb);
 227
 228         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 229                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 230                         return -EACCES;
 231                 else
 232                         return 0;
 233         } else /* file mode might have been restricted at mount time
 234                 on the client (above and beyond ACL on servers) for
 235                 servers which do not support setting and viewing mode bits,
 236                 so allowing client to check permissions is useful */
 237                 return generic_permission(inode, mask);
 238 }
 239
 240 static struct kmem_cache *cifs_inode_cachep;
 241 static struct kmem_cache *cifs_req_cachep;
 242 static struct kmem_cache *cifs_mid_cachep;
 243 static struct kmem_cache *cifs_sm_req_cachep;
 244 mempool_t *cifs_sm_req_poolp;
 245 mempool_t *cifs_req_poolp;
 246 mempool_t *cifs_mid_poolp;
 247
 248 static struct inode *
 249 cifs_alloc_inode(struct super_block *sb)
 250 {
 251         struct cifsInodeInfo *cifs_inode;
 252         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 253         if (!cifs_inode)
 254                 return NULL;
 255         cifs_inode->cifsAttrs = 0x20;   /* default */
 256         cifs_inode->time = 0;
 257         /*
 258          * Until the file is open and we have gotten oplock info back from the
 259          * server, can not assume caching of file data or metadata.
 260          */
 261         cifs_set_oplock_level(cifs_inode, 0);
 262         cifs_inode->flags = 0;
 263         spin_lock_init(&cifs_inode->writers_lock);
 264         cifs_inode->writers = 0;
 265         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 266         cifs_inode->server_eof = 0;
 267         cifs_inode->uniqueid = 0;
 268         cifs_inode->createtime = 0;
 269         cifs_inode->epoch = 0;
 270 #ifdef CONFIG_CIFS_SMB2
 271         get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
 272 #endif
 273         /*
 274          * Can not set i_flags here - they get immediately overwritten to zero
 275          * by the VFS.
 276          */
 277         /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
 278         INIT_LIST_HEAD(&cifs_inode->openFileList);
 279         INIT_LIST_HEAD(&cifs_inode->llist);
 280         return &cifs_inode->vfs_inode;
 281 }
 282
 283 static void cifs_i_callback(struct rcu_head *head)
 284 {
 285         struct inode *inode = container_of(head, struct inode, i_rcu);
 286         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 287 }
 288
 289 static void
 290 cifs_destroy_inode(struct inode *inode)
 291 {
 292         call_rcu(&inode->i_rcu, cifs_i_callback);
 293 }
 294
 295 static void
 296 cifs_evict_inode(struct inode *inode)
 297 {
 298         truncate_inode_pages_final(&inode->i_data);
 299         clear_inode(inode);
 300         cifs_fscache_release_inode_cookie(inode);
 301 }
 302
 303 static void
 304 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 305 {
 306         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 307         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 308
 309         seq_puts(s, ",addr=");
 310
 311         switch (server->dstaddr.ss_family) {
 312         case AF_INET:
 313                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 314                 break;
 315         case AF_INET6:
 316                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 317                 if (sa6->sin6_scope_id)
 318                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 319                 break;
 320         default:
 321                 seq_puts(s, "(unknown)");
 322         }
 323 }
 324
 325 static void
 326 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
 327 {
 328         if (ses->sectype == Unspecified)
 329                 return;
 330
 331         seq_puts(s, ",sec=");
 332
 333         switch (ses->sectype) {
 334         case LANMAN:
 335                 seq_puts(s, "lanman");
 336                 break;
 337         case NTLMv2:
 338                 seq_puts(s, "ntlmv2");
 339                 break;
 340         case NTLM:
 341                 seq_puts(s, "ntlm");
 342                 break;
 343         case Kerberos:
 344                 seq_puts(s, "krb5");
 345                 break;
 346         case RawNTLMSSP:
 347                 seq_puts(s, "ntlmssp");
 348                 break;
 349         default:
 350                 /* shouldn't ever happen */
 351                 seq_puts(s, "unknown");
 352                 break;
 353         }
 354
 355         if (ses->sign)
 356                 seq_puts(s, "i");
 357 }
 358
 359 static void
 360 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
 361 {
 362         seq_puts(s, ",cache=");
 363
 364         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
 365                 seq_puts(s, "strict");
 366         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 367                 seq_puts(s, "none");
 368         else
 369                 seq_puts(s, "loose");
 370 }
 371
 372 static void
 373 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
 374 {
 375         struct nls_table *def;
 376
 377         /* Display iocharset= option if it's not default charset */
 378         def = load_nls_default();
 379         if (def != cur)
 380                 seq_printf(s, ",iocharset=%s", cur->charset);
 381         unload_nls(def);
 382 }
 383
 384 /*
 385  * cifs_show_options() is for displaying mount options in /proc/mounts.
 386  * Not all settable options are displayed but most of the important
 387  * ones are.
 388  */
 389 static int
 390 cifs_show_options(struct seq_file *s, struct dentry *root)
 391 {
 392         struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
 393         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 394         struct sockaddr *srcaddr;
 395         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 396
 397         seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
 398         cifs_show_security(s, tcon->ses);
 399         cifs_show_cache_flavor(s, cifs_sb);
 400
 401         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 402                 seq_puts(s, ",multiuser");
 403         else if (tcon->ses->user_name)
 404                 seq_printf(s, ",username=%s", tcon->ses->user_name);
 405
 406         if (tcon->ses->domainName)
 407                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 408
 409         if (srcaddr->sa_family != AF_UNSPEC) {
 410                 struct sockaddr_in *saddr4;
 411                 struct sockaddr_in6 *saddr6;
 412                 saddr4 = (struct sockaddr_in *)srcaddr;
 413                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 414                 if (srcaddr->sa_family == AF_INET6)
 415                         seq_printf(s, ",srcaddr=%pI6c",
 416                                    &saddr6->sin6_addr);
 417                 else if (srcaddr->sa_family == AF_INET)
 418                         seq_printf(s, ",srcaddr=%pI4",
 419                                    &saddr4->sin_addr.s_addr);
 420                 else
 421                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 422                                    (int)(srcaddr->sa_family));
 423         }
 424
 425         seq_printf(s, ",uid=%u",
 426                    from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
 427         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 428                 seq_puts(s, ",forceuid");
 429         else
 430                 seq_puts(s, ",noforceuid");
 431
 432         seq_printf(s, ",gid=%u",
 433                    from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
 434         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 435                 seq_puts(s, ",forcegid");
 436         else
 437                 seq_puts(s, ",noforcegid");
 438
 439         cifs_show_address(s, tcon->ses->server);
 440
 441         if (!tcon->unix_ext)
 442                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 443                                            cifs_sb->mnt_file_mode,
 444                                            cifs_sb->mnt_dir_mode);
 445
 446         cifs_show_nls(s, cifs_sb->local_nls);
 447
 448         if (tcon->seal)
 449                 seq_puts(s, ",seal");
 450         if (tcon->nocase)
 451                 seq_puts(s, ",nocase");
 452         if (tcon->retry)
 453                 seq_puts(s, ",hard");
 454         if (tcon->unix_ext)
 455                 seq_puts(s, ",unix");
 456         else
 457                 seq_puts(s, ",nounix");
 458         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 459                 seq_puts(s, ",posixpaths");
 460         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 461                 seq_puts(s, ",setuids");
 462         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 463                 seq_puts(s, ",serverino");
 464         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 465                 seq_puts(s, ",rwpidforward");
 466         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 467                 seq_puts(s, ",forcemand");
 468         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 469                 seq_puts(s, ",nouser_xattr");
 470         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 471                 seq_puts(s, ",mapchars");
 472         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 473                 seq_puts(s, ",sfu");
 474         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 475                 seq_puts(s, ",nobrl");
 476         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 477                 seq_puts(s, ",cifsacl");
 478         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 479                 seq_puts(s, ",dynperm");
 480         if (root->d_sb->s_flags & MS_POSIXACL)
 481                 seq_puts(s, ",acl");
 482         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 483                 seq_puts(s, ",mfsymlinks");
 484         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 485                 seq_puts(s, ",fsc");
 486         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 487                 seq_puts(s, ",nostrictsync");
 488         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 489                 seq_puts(s, ",noperm");
 490         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 491                 seq_printf(s, ",backupuid=%u",
 492                            from_kuid_munged(&init_user_ns,
 493                                             cifs_sb->mnt_backupuid));
 494         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 495                 seq_printf(s, ",backupgid=%u",
 496                            from_kgid_munged(&init_user_ns,
 497                                             cifs_sb->mnt_backupgid));
 498
 499         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 500         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 501         /* convert actimeo and display it in seconds */
 502         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 503
 504         return 0;
 505 }
 506
 507 static void cifs_umount_begin(struct super_block *sb)
 508 {
 509         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 510         struct cifs_tcon *tcon;
 511
 512         if (cifs_sb == NULL)
 513                 return;
 514
 515         tcon = cifs_sb_master_tcon(cifs_sb);
 516
 517         spin_lock(&cifs_tcp_ses_lock);
 518         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 519                 /* we have other mounts to same share or we have
 520                    already tried to force umount this and woken up
 521                    all waiting network requests, nothing to do */
 522                 spin_unlock(&cifs_tcp_ses_lock);
 523                 return;
 524         } else if (tcon->tc_count == 1)
 525                 tcon->tidStatus = CifsExiting;
 526         spin_unlock(&cifs_tcp_ses_lock);
 527
 528         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 529         /* cancel_notify_requests(tcon); */
 530         if (tcon->ses && tcon->ses->server) {
 531                 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
 532                 wake_up_all(&tcon->ses->server->request_q);
 533                 wake_up_all(&tcon->ses->server->response_q);
 534                 msleep(1); /* yield */
 535                 /* we have to kick the requests once more */
 536                 wake_up_all(&tcon->ses->server->response_q);
 537                 msleep(1);
 538         }
 539
 540         return;
 541 }
 542
 543 #ifdef CONFIG_CIFS_STATS2
 544 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 545 {
 546         /* BB FIXME */
 547         return 0;
 548 }
 549 #endif
 550
 551 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 552 {
 553         sync_filesystem(sb);
 554         *flags |= MS_NODIRATIME;
 555         return 0;
 556 }
 557
 558 static int cifs_drop_inode(struct inode *inode)
 559 {
 560         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 561
 562         /* no serverino => unconditional eviction */
 563         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 564                 generic_drop_inode(inode);
 565 }
 566
 567 static const struct super_operations cifs_super_ops = {
 568         .statfs = cifs_statfs,
 569         .alloc_inode = cifs_alloc_inode,
 570         .destroy_inode = cifs_destroy_inode,
 571         .drop_inode     = cifs_drop_inode,
 572         .evict_inode    = cifs_evict_inode,
 573 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 574         function unless later we add lazy close of inodes or unless the
 575         kernel forgets to call us with the same number of releases (closes)
 576         as opens */
 577         .show_options = cifs_show_options,
 578         .umount_begin   = cifs_umount_begin,
 579         .remount_fs = cifs_remount,
 580 #ifdef CONFIG_CIFS_STATS2
 581         .show_stats = cifs_show_stats,
 582 #endif
 583 };
 584
 585 /*
 586  * Get root dentry from superblock according to prefix path mount option.
 587  * Return dentry with refcount + 1 on success and NULL otherwise.
 588  */
 589 static struct dentry *
 590 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 591 {
 592         struct dentry *dentry;
 593         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 594         char *full_path = NULL;
 595         char *s, *p;
 596         char sep;
 597
 598         full_path = cifs_build_path_to_root(vol, cifs_sb,
 599                                             cifs_sb_master_tcon(cifs_sb));
 600         if (full_path == NULL)
 601                 return ERR_PTR(-ENOMEM);
 602
 603         cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
 604
 605         sep = CIFS_DIR_SEP(cifs_sb);
 606         dentry = dget(sb->s_root);
 607         p = s = full_path;
 608
 609         do {
 610                 struct inode *dir = dentry->d_inode;
 611                 struct dentry *child;
 612
 613                 if (!dir) {
 614                         dput(dentry);
 615                         dentry = ERR_PTR(-ENOENT);
 616                         break;
 617                 }
 618                 if (!S_ISDIR(dir->i_mode)) {
 619                         dput(dentry);
 620                         dentry = ERR_PTR(-ENOTDIR);
 621                         break;
 622                 }
 623
 624                 /* skip separators */
 625                 while (*s == sep)
 626                         s++;
 627                 if (!*s)
 628                         break;
 629                 p = s++;
 630                 /* next separator */
 631                 while (*s && *s != sep)
 632                         s++;
 633
 634                 mutex_lock(&dir->i_mutex);
 635                 child = lookup_one_len(p, dentry, s - p);
 636                 mutex_unlock(&dir->i_mutex);
 637                 dput(dentry);
 638                 dentry = child;
 639         } while (!IS_ERR(dentry));
 640         kfree(full_path);
 641         return dentry;
 642 }
 643
 644 static int cifs_set_super(struct super_block *sb, void *data)
 645 {
 646         struct cifs_mnt_data *mnt_data = data;
 647         sb->s_fs_info = mnt_data->cifs_sb;
 648         return set_anon_super(sb, NULL);
 649 }
 650
 651 static struct dentry *
 652 cifs_do_mount(struct file_system_type *fs_type,
 653               int flags, const char *dev_name, void *data)
 654 {
 655         int rc;
 656         struct super_block *sb;
 657         struct cifs_sb_info *cifs_sb;
 658         struct smb_vol *volume_info;
 659         struct cifs_mnt_data mnt_data;
 660         struct dentry *root;
 661
 662         cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
 663
 664         volume_info = cifs_get_volume_info((char *)data, dev_name);
 665         if (IS_ERR(volume_info))
 666                 return ERR_CAST(volume_info);
 667
 668         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 669         if (cifs_sb == NULL) {
 670                 root = ERR_PTR(-ENOMEM);
 671                 goto out_nls;
 672         }
 673
 674         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 675         if (cifs_sb->mountdata == NULL) {
 676                 root = ERR_PTR(-ENOMEM);
 677                 goto out_cifs_sb;
 678         }
 679
 680         cifs_setup_cifs_sb(volume_info, cifs_sb);
 681
 682         rc = cifs_mount(cifs_sb, volume_info);
 683         if (rc) {
 684                 if (!(flags & MS_SILENT))
 685                         cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
 686                                  rc);
 687                 root = ERR_PTR(rc);
 688                 goto out_mountdata;
 689         }
 690
 691         mnt_data.vol = volume_info;
 692         mnt_data.cifs_sb = cifs_sb;
 693         mnt_data.flags = flags;
 694
 695         /* BB should we make this contingent on mount parm? */
 696         flags |= MS_NODIRATIME | MS_NOATIME;
 697
 698         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 699         if (IS_ERR(sb)) {
 700                 root = ERR_CAST(sb);
 701                 cifs_umount(cifs_sb);
 702                 goto out;
 703         }
 704
 705         if (sb->s_root) {
 706                 cifs_dbg(FYI, "Use existing superblock\n");
 707                 cifs_umount(cifs_sb);
 708         } else {
 709                 rc = cifs_read_super(sb);
 710                 if (rc) {
 711                         root = ERR_PTR(rc);
 712                         goto out_super;
 713                 }
 714
 715                 sb->s_flags |= MS_ACTIVE;
 716         }
 717
 718         root = cifs_get_root(volume_info, sb);
 719         if (IS_ERR(root))
 720                 goto out_super;
 721
 722         cifs_dbg(FYI, "dentry root is: %p\n", root);
 723         goto out;
 724
 725 out_super:
 726         deactivate_locked_super(sb);
 727 out:
 728         cifs_cleanup_volume_info(volume_info);
 729         return root;
 730
 731 out_mountdata:
 732         kfree(cifs_sb->mountdata);
 733 out_cifs_sb:
 734         kfree(cifs_sb);
 735 out_nls:
 736         unload_nls(volume_info->local_nls);
 737         goto out;
 738 }
 739
 740 static ssize_t
 741 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 742 {
 743         ssize_t rc;
 744         struct inode *inode = file_inode(iocb->ki_filp);
 745
 746         rc = cifs_revalidate_mapping(inode);
 747         if (rc)
 748                 return rc;
 749
 750         return generic_file_read_iter(iocb, iter);
 751 }
 752
 753 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 754 {
 755         struct inode *inode = file_inode(iocb->ki_filp);
 756         struct cifsInodeInfo *cinode = CIFS_I(inode);
 757         ssize_t written;
 758         int rc;
 759
 760         written = cifs_get_writer(cinode);
 761         if (written)
 762                 return written;
 763
 764         written = generic_file_write_iter(iocb, from);
 765
 766         if (CIFS_CACHE_WRITE(CIFS_I(inode)))
 767                 goto out;
 768
 769         rc = filemap_fdatawrite(inode->i_mapping);
 770         if (rc)
 771                 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
 772                          rc, inode);
 773
 774 out:
 775         cifs_put_writer(cinode);
 776         return written;
 777 }
 778
 779 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
 780 {
 781         /*
 782          * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 783          * the cached file length
 784          */
 785         if (whence != SEEK_SET && whence != SEEK_CUR) {
 786                 int rc;
 787                 struct inode *inode = file_inode(file);
 788
 789                 /*
 790                  * We need to be sure that all dirty pages are written and the
 791                  * server has the newest file length.
 792                  */
 793                 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
 794                     inode->i_mapping->nrpages != 0) {
 795                         rc = filemap_fdatawait(inode->i_mapping);
 796                         if (rc) {
 797                                 mapping_set_error(inode->i_mapping, rc);
 798                                 return rc;
 799                         }
 800                 }
 801                 /*
 802                  * Some applications poll for the file length in this strange
 803                  * way so we must seek to end on non-oplocked files by
 804                  * setting the revalidate time to zero.
 805                  */
 806                 CIFS_I(inode)->time = 0;
 807
 808                 rc = cifs_revalidate_file_attr(file);
 809                 if (rc < 0)
 810                         return (loff_t)rc;
 811         }
 812         return generic_file_llseek(file, offset, whence);
 813 }
 814
 815 static int
 816 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
 817 {
 818         /*
 819          * Note that this is called by vfs setlease with i_lock held to
 820          * protect *lease from going away.
 821          */
 822         struct inode *inode = file_inode(file);
 823         struct cifsFileInfo *cfile = file->private_data;
 824
 825         if (!(S_ISREG(inode->i_mode)))
 826                 return -EINVAL;
 827
 828         /* Check if file is oplocked if this is request for new lease */
 829         if (arg == F_UNLCK ||
 830             ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
 831             ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
 832                 return generic_setlease(file, arg, lease, priv);
 833         else if (tlink_tcon(cfile->tlink)->local_lease &&
 834                  !CIFS_CACHE_READ(CIFS_I(inode)))
 835                 /*
 836                  * If the server claims to support oplock on this file, then we
 837                  * still need to check oplock even if the local_lease mount
 838                  * option is set, but there are servers which do not support
 839                  * oplock for which this mount option may be useful if the user
 840                  * knows that the file won't be changed on the server by anyone
 841                  * else.
 842                  */
 843                 return generic_setlease(file, arg, lease, priv);
 844         else
 845                 return -EAGAIN;
 846 }
 847
 848 struct file_system_type cifs_fs_type = {
 849         .owner = THIS_MODULE,
 850         .name = "cifs",
 851         .mount = cifs_do_mount,
 852         .kill_sb = cifs_kill_sb,
 853         /*  .fs_flags */
 854 };
 855 MODULE_ALIAS_FS("cifs");
 856 const struct inode_operations cifs_dir_inode_ops = {
 857         .create = cifs_create,
 858         .atomic_open = cifs_atomic_open,
 859         .lookup = cifs_lookup,
 860         .getattr = cifs_getattr,
 861         .unlink = cifs_unlink,
 862         .link = cifs_hardlink,
 863         .mkdir = cifs_mkdir,
 864         .rmdir = cifs_rmdir,
 865         .rename2 = cifs_rename2,
 866         .permission = cifs_permission,
 867 /*      revalidate:cifs_revalidate,   */
 868         .setattr = cifs_setattr,
 869         .symlink = cifs_symlink,
 870         .mknod   = cifs_mknod,
 871 #ifdef CONFIG_CIFS_XATTR
 872         .setxattr = cifs_setxattr,
 873         .getxattr = cifs_getxattr,
 874         .listxattr = cifs_listxattr,
 875         .removexattr = cifs_removexattr,
 876 #endif
 877 };
 878
 879 const struct inode_operations cifs_file_inode_ops = {
 880 /*      revalidate:cifs_revalidate, */
 881         .setattr = cifs_setattr,
 882         .getattr = cifs_getattr, /* do we need this anymore? */
 883         .permission = cifs_permission,
 884 #ifdef CONFIG_CIFS_XATTR
 885         .setxattr = cifs_setxattr,
 886         .getxattr = cifs_getxattr,
 887         .listxattr = cifs_listxattr,
 888         .removexattr = cifs_removexattr,
 889 #endif
 890 };
 891
 892 const struct inode_operations cifs_symlink_inode_ops = {
 893         .readlink = generic_readlink,
 894         .follow_link = cifs_follow_link,
 895         .put_link = kfree_put_link,
 896         .permission = cifs_permission,
 897         /* BB add the following two eventually */
 898         /* revalidate: cifs_revalidate,
 899            setattr:    cifs_notify_change, *//* BB do we need notify change */
 900 #ifdef CONFIG_CIFS_XATTR
 901         .setxattr = cifs_setxattr,
 902         .getxattr = cifs_getxattr,
 903         .listxattr = cifs_listxattr,
 904         .removexattr = cifs_removexattr,
 905 #endif
 906 };
 907
 908 const struct file_operations cifs_file_ops = {
 909         .read = new_sync_read,
 910         .write = new_sync_write,
 911         .read_iter = cifs_loose_read_iter,
 912         .write_iter = cifs_file_write_iter,
 913         .open = cifs_open,
 914         .release = cifs_close,
 915         .lock = cifs_lock,
 916         .fsync = cifs_fsync,
 917         .flush = cifs_flush,
 918         .mmap  = cifs_file_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         .fallocate = cifs_fallocate,
 926 };
 927
 928 const struct file_operations cifs_file_strict_ops = {
 929         .read = new_sync_read,
 930         .write = new_sync_write,
 931         .read_iter = cifs_strict_readv,
 932         .write_iter = cifs_strict_writev,
 933         .open = cifs_open,
 934         .release = cifs_close,
 935         .lock = cifs_lock,
 936         .fsync = cifs_strict_fsync,
 937         .flush = cifs_flush,
 938         .mmap = cifs_file_strict_mmap,
 939         .splice_read = generic_file_splice_read,
 940         .llseek = cifs_llseek,
 941 #ifdef CONFIG_CIFS_POSIX
 942         .unlocked_ioctl = cifs_ioctl,
 943 #endif /* CONFIG_CIFS_POSIX */
 944         .setlease = cifs_setlease,
 945         .fallocate = cifs_fallocate,
 946 };
 947
 948 const struct file_operations cifs_file_direct_ops = {
 949         /* BB reevaluate whether they can be done with directio, no cache */
 950         .read = new_sync_read,
 951         .write = new_sync_write,
 952         .read_iter = cifs_user_readv,
 953         .write_iter = cifs_user_writev,
 954         .open = cifs_open,
 955         .release = cifs_close,
 956         .lock = cifs_lock,
 957         .fsync = cifs_fsync,
 958         .flush = cifs_flush,
 959         .mmap = cifs_file_mmap,
 960         .splice_read = generic_file_splice_read,
 961 #ifdef CONFIG_CIFS_POSIX
 962         .unlocked_ioctl  = cifs_ioctl,
 963 #endif /* CONFIG_CIFS_POSIX */
 964         .llseek = cifs_llseek,
 965         .setlease = cifs_setlease,
 966         .fallocate = cifs_fallocate,
 967 };
 968
 969 const struct file_operations cifs_file_nobrl_ops = {
 970         .read = new_sync_read,
 971         .write = new_sync_write,
 972         .read_iter = cifs_loose_read_iter,
 973         .write_iter = cifs_file_write_iter,
 974         .open = cifs_open,
 975         .release = cifs_close,
 976         .fsync = cifs_fsync,
 977         .flush = cifs_flush,
 978         .mmap  = cifs_file_mmap,
 979         .splice_read = generic_file_splice_read,
 980         .llseek = cifs_llseek,
 981 #ifdef CONFIG_CIFS_POSIX
 982         .unlocked_ioctl = cifs_ioctl,
 983 #endif /* CONFIG_CIFS_POSIX */
 984         .setlease = cifs_setlease,
 985         .fallocate = cifs_fallocate,
 986 };
 987
 988 const struct file_operations cifs_file_strict_nobrl_ops = {
 989         .read = new_sync_read,
 990         .write = new_sync_write,
 991         .read_iter = cifs_strict_readv,
 992         .write_iter = cifs_strict_writev,
 993         .open = cifs_open,
 994         .release = cifs_close,
 995         .fsync = cifs_strict_fsync,
 996         .flush = cifs_flush,
 997         .mmap = cifs_file_strict_mmap,
 998         .splice_read = generic_file_splice_read,
 999         .llseek = cifs_llseek,
1000 #ifdef CONFIG_CIFS_POSIX
1001         .unlocked_ioctl = cifs_ioctl,
1002 #endif /* CONFIG_CIFS_POSIX */
1003         .setlease = cifs_setlease,
1004         .fallocate = cifs_fallocate,
1005 };
1006
1007 const struct file_operations cifs_file_direct_nobrl_ops = {
1008         /* BB reevaluate whether they can be done with directio, no cache */
1009         .read = new_sync_read,
1010         .write = new_sync_write,
1011         .read_iter = cifs_user_readv,
1012         .write_iter = cifs_user_writev,
1013         .open = cifs_open,
1014         .release = cifs_close,
1015         .fsync = cifs_fsync,
1016         .flush = cifs_flush,
1017         .mmap = cifs_file_mmap,
1018         .splice_read = generic_file_splice_read,
1019 #ifdef CONFIG_CIFS_POSIX
1020         .unlocked_ioctl  = cifs_ioctl,
1021 #endif /* CONFIG_CIFS_POSIX */
1022         .llseek = cifs_llseek,
1023         .setlease = cifs_setlease,
1024         .fallocate = cifs_fallocate,
1025 };
1026
1027 const struct file_operations cifs_dir_ops = {
1028         .iterate = cifs_readdir,
1029         .release = cifs_closedir,
1030         .read    = generic_read_dir,
1031         .unlocked_ioctl  = cifs_ioctl,
1032         .llseek = generic_file_llseek,
1033 };
1034
1035 static void
1036 cifs_init_once(void *inode)
1037 {
1038         struct cifsInodeInfo *cifsi = inode;
1039
1040         inode_init_once(&cifsi->vfs_inode);
1041         init_rwsem(&cifsi->lock_sem);
1042 }
1043
1044 static int __init
1045 cifs_init_inodecache(void)
1046 {
1047         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1048                                               sizeof(struct cifsInodeInfo),
1049                                               0, (SLAB_RECLAIM_ACCOUNT|
1050                                                 SLAB_MEM_SPREAD),
1051                                               cifs_init_once);
1052         if (cifs_inode_cachep == NULL)
1053                 return -ENOMEM;
1054
1055         return 0;
1056 }
1057
1058 static void
1059 cifs_destroy_inodecache(void)
1060 {
1061         /*
1062          * Make sure all delayed rcu free inodes are flushed before we
1063          * destroy cache.
1064          */
1065         rcu_barrier();
1066         kmem_cache_destroy(cifs_inode_cachep);
1067 }
1068
1069 static int
1070 cifs_init_request_bufs(void)
1071 {
1072         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1073 #ifdef CONFIG_CIFS_SMB2
1074         /*
1075          * SMB2 maximum header size is bigger than CIFS one - no problems to
1076          * allocate some more bytes for CIFS.
1077          */
1078         max_hdr_size = MAX_SMB2_HDR_SIZE;
1079 #endif
1080         if (CIFSMaxBufSize < 8192) {
1081         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1082         Unicode path name has to fit in any SMB/CIFS path based frames */
1083                 CIFSMaxBufSize = 8192;
1084         } else if (CIFSMaxBufSize > 1024*127) {
1085                 CIFSMaxBufSize = 1024 * 127;
1086         } else {
1087                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1088         }
1089 /*
1090         cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1091                  CIFSMaxBufSize, CIFSMaxBufSize);
1092 */
1093         cifs_req_cachep = kmem_cache_create("cifs_request",
1094                                             CIFSMaxBufSize + max_hdr_size, 0,
1095                                             SLAB_HWCACHE_ALIGN, NULL);
1096         if (cifs_req_cachep == NULL)
1097                 return -ENOMEM;
1098
1099         if (cifs_min_rcv < 1)
1100                 cifs_min_rcv = 1;
1101         else if (cifs_min_rcv > 64) {
1102                 cifs_min_rcv = 64;
1103                 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1104         }
1105
1106         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1107                                                   cifs_req_cachep);
1108
1109         if (cifs_req_poolp == NULL) {
1110                 kmem_cache_destroy(cifs_req_cachep);
1111                 return -ENOMEM;
1112         }
1113         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1114         almost all handle based requests (but not write response, nor is it
1115         sufficient for path based requests).  A smaller size would have
1116         been more efficient (compacting multiple slab items on one 4k page)
1117         for the case in which debug was on, but this larger size allows
1118         more SMBs to use small buffer alloc and is still much more
1119         efficient to alloc 1 per page off the slab compared to 17K (5page)
1120         alloc of large cifs buffers even when page debugging is on */
1121         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1122                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1123                         NULL);
1124         if (cifs_sm_req_cachep == NULL) {
1125                 mempool_destroy(cifs_req_poolp);
1126                 kmem_cache_destroy(cifs_req_cachep);
1127                 return -ENOMEM;
1128         }
1129
1130         if (cifs_min_small < 2)
1131                 cifs_min_small = 2;
1132         else if (cifs_min_small > 256) {
1133                 cifs_min_small = 256;
1134                 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1135         }
1136
1137         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1138                                                      cifs_sm_req_cachep);
1139
1140         if (cifs_sm_req_poolp == NULL) {
1141                 mempool_destroy(cifs_req_poolp);
1142                 kmem_cache_destroy(cifs_req_cachep);
1143                 kmem_cache_destroy(cifs_sm_req_cachep);
1144                 return -ENOMEM;
1145         }
1146
1147         return 0;
1148 }
1149
1150 static void
1151 cifs_destroy_request_bufs(void)
1152 {
1153         mempool_destroy(cifs_req_poolp);
1154         kmem_cache_destroy(cifs_req_cachep);
1155         mempool_destroy(cifs_sm_req_poolp);
1156         kmem_cache_destroy(cifs_sm_req_cachep);
1157 }
1158
1159 static int
1160 cifs_init_mids(void)
1161 {
1162         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1163                                             sizeof(struct mid_q_entry), 0,
1164                                             SLAB_HWCACHE_ALIGN, NULL);
1165         if (cifs_mid_cachep == NULL)
1166                 return -ENOMEM;
1167
1168         /* 3 is a reasonable minimum number of simultaneous operations */
1169         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1170         if (cifs_mid_poolp == NULL) {
1171                 kmem_cache_destroy(cifs_mid_cachep);
1172                 return -ENOMEM;
1173         }
1174
1175         return 0;
1176 }
1177
1178 static void
1179 cifs_destroy_mids(void)
1180 {
1181         mempool_destroy(cifs_mid_poolp);
1182         kmem_cache_destroy(cifs_mid_cachep);
1183 }
1184
1185 static int __init
1186 init_cifs(void)
1187 {
1188         int rc = 0;
1189         cifs_proc_init();
1190         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1191 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1192         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1193         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1194 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1195 /*
1196  *  Initialize Global counters
1197  */
1198         atomic_set(&sesInfoAllocCount, 0);
1199         atomic_set(&tconInfoAllocCount, 0);
1200         atomic_set(&tcpSesAllocCount, 0);
1201         atomic_set(&tcpSesReconnectCount, 0);
1202         atomic_set(&tconInfoReconnectCount, 0);
1203
1204         atomic_set(&bufAllocCount, 0);
1205         atomic_set(&smBufAllocCount, 0);
1206 #ifdef CONFIG_CIFS_STATS2
1207         atomic_set(&totBufAllocCount, 0);
1208         atomic_set(&totSmBufAllocCount, 0);
1209 #endif /* CONFIG_CIFS_STATS2 */
1210
1211         atomic_set(&midCount, 0);
1212         GlobalCurrentXid = 0;
1213         GlobalTotalActiveXid = 0;
1214         GlobalMaxActiveXid = 0;
1215         spin_lock_init(&cifs_tcp_ses_lock);
1216         spin_lock_init(&cifs_file_list_lock);
1217         spin_lock_init(&GlobalMid_Lock);
1218
1219         if (cifs_max_pending < 2) {
1220                 cifs_max_pending = 2;
1221                 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1222         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1223                 cifs_max_pending = CIFS_MAX_REQ;
1224                 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1225                          CIFS_MAX_REQ);
1226         }
1227
1228         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1229         if (!cifsiod_wq) {
1230                 rc = -ENOMEM;
1231                 goto out_clean_proc;
1232         }
1233
1234         rc = cifs_fscache_register();
1235         if (rc)
1236                 goto out_destroy_wq;
1237
1238         rc = cifs_init_inodecache();
1239         if (rc)
1240                 goto out_unreg_fscache;
1241
1242         rc = cifs_init_mids();
1243         if (rc)
1244                 goto out_destroy_inodecache;
1245
1246         rc = cifs_init_request_bufs();
1247         if (rc)
1248                 goto out_destroy_mids;
1249
1250 #ifdef CONFIG_CIFS_UPCALL
1251         rc = register_key_type(&cifs_spnego_key_type);
1252         if (rc)
1253                 goto out_destroy_request_bufs;
1254 #endif /* CONFIG_CIFS_UPCALL */
1255
1256 #ifdef CONFIG_CIFS_ACL
1257         rc = init_cifs_idmap();
1258         if (rc)
1259                 goto out_register_key_type;
1260 #endif /* CONFIG_CIFS_ACL */
1261
1262         rc = register_filesystem(&cifs_fs_type);
1263         if (rc)
1264                 goto out_init_cifs_idmap;
1265
1266         return 0;
1267
1268 out_init_cifs_idmap:
1269 #ifdef CONFIG_CIFS_ACL
1270         exit_cifs_idmap();
1271 out_register_key_type:
1272 #endif
1273 #ifdef CONFIG_CIFS_UPCALL
1274         unregister_key_type(&cifs_spnego_key_type);
1275 out_destroy_request_bufs:
1276 #endif
1277         cifs_destroy_request_bufs();
1278 out_destroy_mids:
1279         cifs_destroy_mids();
1280 out_destroy_inodecache:
1281         cifs_destroy_inodecache();
1282 out_unreg_fscache:
1283         cifs_fscache_unregister();
1284 out_destroy_wq:
1285         destroy_workqueue(cifsiod_wq);
1286 out_clean_proc:
1287         cifs_proc_clean();
1288         return rc;
1289 }
1290
1291 static void __exit
1292 exit_cifs(void)
1293 {
1294         cifs_dbg(NOISY, "exit_cifs\n");
1295         unregister_filesystem(&cifs_fs_type);
1296         cifs_dfs_release_automount_timer();
1297 #ifdef CONFIG_CIFS_ACL
1298         exit_cifs_idmap();
1299 #endif
1300 #ifdef CONFIG_CIFS_UPCALL
1301         unregister_key_type(&cifs_spnego_key_type);
1302 #endif
1303         cifs_destroy_request_bufs();
1304         cifs_destroy_mids();
1305         cifs_destroy_inodecache();
1306         cifs_fscache_unregister();
1307         destroy_workqueue(cifsiod_wq);
1308         cifs_proc_clean();
1309 }
1310
1311 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1312 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1313 MODULE_DESCRIPTION
1314     ("VFS to access servers complying with the SNIA CIFS Specification "
1315      "e.g. Samba and Windows");
1316 MODULE_VERSION(CIFS_VERSION);
1317 module_init(init_cifs)
1318 module_exit(exit_cifs)