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