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