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