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 <linux/xattr.h>
  41 #include <net/ipv6.h>
  42 #include "cifsfs.h"
  43 #include "cifspdu.h"
  44 #define DECLARE_GLOBALS_HERE
  45 #include "cifsglob.h"
  46 #include "cifsproto.h"
  47 #include "cifs_debug.h"
  48 #include "cifs_fs_sb.h"
  49 #include <linux/mm.h>
  50 #include <linux/key-type.h>
  51 #include "cifs_spnego.h"
  52 #include "fscache.h"
  53 #ifdef CONFIG_CIFS_SMB2
  54 #include "smb2pdu.h"
  55 #endif
  56
  57 int cifsFYI = 0;
  58 bool traceSMB;
  59 bool enable_oplocks = true;
  60 bool linuxExtEnabled = true;
  61 bool lookupCacheEnabled = true;
  62 unsigned int global_secflags = CIFSSEC_DEF;
  63 /* unsigned int ntlmv2_support = 0; */
  64 unsigned int sign_CIFS_PDUs = 1;
  65 static const struct super_operations cifs_super_ops;
  66 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  67 module_param(CIFSMaxBufSize, uint, 0444);
  68 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  69                                  "Default: 16384 Range: 8192 to 130048");
  70 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  71 module_param(cifs_min_rcv, uint, 0444);
  72 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  73                                 "1 to 64");
  74 unsigned int cifs_min_small = 30;
  75 module_param(cifs_min_small, uint, 0444);
  76 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  77                                  "Range: 2 to 256");
  78 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  79 module_param(cifs_max_pending, uint, 0444);
  80 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  81                                    "Default: 32767 Range: 2 to 32767.");
  82 module_param(enable_oplocks, bool, 0644);
  83 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
  84
  85 extern mempool_t *cifs_sm_req_poolp;
  86 extern mempool_t *cifs_req_poolp;
  87 extern mempool_t *cifs_mid_poolp;
  88
  89 struct workqueue_struct *cifsiod_wq;
  90 __u32 cifs_lock_secret;
  91
  92 /*
  93  * Bumps refcount for cifs super block.
  94  * Note that it should be only called if a referece to VFS super block is
  95  * already held, e.g. in open-type syscalls context. Otherwise it can race with
  96  * atomic_dec_and_test in deactivate_locked_super.
  97  */
  98 void
  99 cifs_sb_active(struct super_block *sb)
 100 {
 101         struct cifs_sb_info *server = CIFS_SB(sb);
 102
 103         if (atomic_inc_return(&server->active) == 1)
 104                 atomic_inc(&sb->s_active);
 105 }
 106
 107 void
 108 cifs_sb_deactive(struct super_block *sb)
 109 {
 110         struct cifs_sb_info *server = CIFS_SB(sb);
 111
 112         if (atomic_dec_and_test(&server->active))
 113                 deactivate_super(sb);
 114 }
 115
 116 static int
 117 cifs_read_super(struct super_block *sb)
 118 {
 119         struct inode *inode;
 120         struct cifs_sb_info *cifs_sb;
 121         struct cifs_tcon *tcon;
 122         int rc = 0;
 123
 124         cifs_sb = CIFS_SB(sb);
 125         tcon = cifs_sb_master_tcon(cifs_sb);
 126
 127         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
 128                 sb->s_flags |= MS_POSIXACL;
 129
 130         if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
 131                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 132         else
 133                 sb->s_maxbytes = MAX_NON_LFS;
 134
 135         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
 136         sb->s_time_gran = 100;
 137
 138         sb->s_magic = CIFS_MAGIC_NUMBER;
 139         sb->s_op = &cifs_super_ops;
 140         sb->s_xattr = cifs_xattr_handlers;
 141         sb->s_bdi = &cifs_sb->bdi;
 142         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 143         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 144         inode = cifs_root_iget(sb);
 145
 146         if (IS_ERR(inode)) {
 147                 rc = PTR_ERR(inode);
 148                 goto out_no_root;
 149         }
 150
 151         if (tcon->nocase)
 152                 sb->s_d_op = &cifs_ci_dentry_ops;
 153         else
 154                 sb->s_d_op = &cifs_dentry_ops;
 155
 156         sb->s_root = d_make_root(inode);
 157         if (!sb->s_root) {
 158                 rc = -ENOMEM;
 159                 goto out_no_root;
 160         }
 161
 162 #ifdef CONFIG_CIFS_NFSD_EXPORT
 163         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 164                 cifs_dbg(FYI, "export ops supported\n");
 165                 sb->s_export_op = &cifs_export_ops;
 166         }
 167 #endif /* CONFIG_CIFS_NFSD_EXPORT */
 168
 169         return 0;
 170
 171 out_no_root:
 172         cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
 173         return rc;
 174 }
 175
 176 static void cifs_kill_sb(struct super_block *sb)
 177 {
 178         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 179         kill_anon_super(sb);
 180         cifs_umount(cifs_sb);
 181 }
 182
 183 static int
 184 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 185 {
 186         struct super_block *sb = dentry->d_sb;
 187         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 188         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 189         struct TCP_Server_Info *server = tcon->ses->server;
 190         unsigned int xid;
 191         int rc = 0;
 192
 193         xid = get_xid();
 194
 195         /*
 196          * PATH_MAX may be too long - it would presumably be total path,
 197          * but note that some servers (includinng Samba 3) have a shorter
 198          * maximum path.
 199          *
 200          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 201          */
 202         buf->f_namelen = PATH_MAX;
 203         buf->f_files = 0;       /* undefined */
 204         buf->f_ffree = 0;       /* unlimited */
 205
 206         if (server->ops->queryfs)
 207                 rc = server->ops->queryfs(xid, tcon, buf);
 208
 209         free_xid(xid);
 210         return 0;
 211 }
 212
 213 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
 214 {
 215         struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
 216         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 217         struct TCP_Server_Info *server = tcon->ses->server;
 218
 219         if (server->ops->fallocate)
 220                 return server->ops->fallocate(file, tcon, mode, off, len);
 221
 222         return -EOPNOTSUPP;
 223 }
 224
 225 static int cifs_permission(struct inode *inode, int mask)
 226 {
 227         struct cifs_sb_info *cifs_sb;
 228
 229         cifs_sb = CIFS_SB(inode->i_sb);
 230
 231         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 232                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 233                         return -EACCES;
 234                 else
 235                         return 0;
 236         } else /* file mode might have been restricted at mount time
 237                 on the client (above and beyond ACL on servers) for
 238                 servers which do not support setting and viewing mode bits,
 239                 so allowing client to check permissions is useful */
 240                 return generic_permission(inode, mask);
 241 }
 242
 243 static struct kmem_cache *cifs_inode_cachep;
 244 static struct kmem_cache *cifs_req_cachep;
 245 static struct kmem_cache *cifs_mid_cachep;
 246 static struct kmem_cache *cifs_sm_req_cachep;
 247 mempool_t *cifs_sm_req_poolp;
 248 mempool_t *cifs_req_poolp;
 249 mempool_t *cifs_mid_poolp;
 250
 251 static struct inode *
 252 cifs_alloc_inode(struct super_block *sb)
 253 {
 254         struct cifsInodeInfo *cifs_inode;
 255         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 256         if (!cifs_inode)
 257                 return NULL;
 258         cifs_inode->cifsAttrs = 0x20;   /* default */
 259         cifs_inode->time = 0;
 260         /*
 261          * Until the file is open and we have gotten oplock info back from the
 262          * server, can not assume caching of file data or metadata.
 263          */
 264         cifs_set_oplock_level(cifs_inode, 0);
 265         cifs_inode->flags = 0;
 266         spin_lock_init(&cifs_inode->writers_lock);
 267         cifs_inode->writers = 0;
 268         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 269         cifs_inode->server_eof = 0;
 270         cifs_inode->uniqueid = 0;
 271         cifs_inode->createtime = 0;
 272         cifs_inode->epoch = 0;
 273 #ifdef CONFIG_CIFS_SMB2
 274         generate_random_uuid(cifs_inode->lease_key);
 275 #endif
 276         /*
 277          * Can not set i_flags here - they get immediately overwritten to zero
 278          * by the VFS.
 279          */
 280         /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
 281         INIT_LIST_HEAD(&cifs_inode->openFileList);
 282         INIT_LIST_HEAD(&cifs_inode->llist);
 283         return &cifs_inode->vfs_inode;
 284 }
 285
 286 static void cifs_i_callback(struct rcu_head *head)
 287 {
 288         struct inode *inode = container_of(head, struct inode, i_rcu);
 289         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 290 }
 291
 292 static void
 293 cifs_destroy_inode(struct inode *inode)
 294 {
 295         call_rcu(&inode->i_rcu, cifs_i_callback);
 296 }
 297
 298 static void
 299 cifs_evict_inode(struct inode *inode)
 300 {
 301         truncate_inode_pages_final(&inode->i_data);
 302         clear_inode(inode);
 303         cifs_fscache_release_inode_cookie(inode);
 304 }
 305
 306 static void
 307 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 308 {
 309         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 310         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 311
 312         seq_puts(s, ",addr=");
 313
 314         switch (server->dstaddr.ss_family) {
 315         case AF_INET:
 316                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 317                 break;
 318         case AF_INET6:
 319                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 320                 if (sa6->sin6_scope_id)
 321                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 322                 break;
 323         default:
 324                 seq_puts(s, "(unknown)");
 325         }
 326 }
 327
 328 static void
 329 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
 330 {
 331         if (ses->sectype == Unspecified) {
 332                 if (ses->user_name == NULL)
 333                         seq_puts(s, ",sec=none");
 334                 return;
 335         }
 336
 337         seq_puts(s, ",sec=");
 338
 339         switch (ses->sectype) {
 340         case LANMAN:
 341                 seq_puts(s, "lanman");
 342                 break;
 343         case NTLMv2:
 344                 seq_puts(s, "ntlmv2");
 345                 break;
 346         case NTLM:
 347                 seq_puts(s, "ntlm");
 348                 break;
 349         case Kerberos:
 350                 seq_puts(s, "krb5");
 351                 break;
 352         case RawNTLMSSP:
 353                 seq_puts(s, "ntlmssp");
 354                 break;
 355         default:
 356                 /* shouldn't ever happen */
 357                 seq_puts(s, "unknown");
 358                 break;
 359         }
 360
 361         if (ses->sign)
 362                 seq_puts(s, "i");
 363 }
 364
 365 static void
 366 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
 367 {
 368         seq_puts(s, ",cache=");
 369
 370         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
 371                 seq_puts(s, "strict");
 372         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 373                 seq_puts(s, "none");
 374         else
 375                 seq_puts(s, "loose");
 376 }
 377
 378 static void
 379 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
 380 {
 381         struct nls_table *def;
 382
 383         /* Display iocharset= option if it's not default charset */
 384         def = load_nls_default();
 385         if (def != cur)
 386                 seq_printf(s, ",iocharset=%s", cur->charset);
 387         unload_nls(def);
 388 }
 389
 390 /*
 391  * cifs_show_options() is for displaying mount options in /proc/mounts.
 392  * Not all settable options are displayed but most of the important
 393  * ones are.
 394  */
 395 static int
 396 cifs_show_options(struct seq_file *s, struct dentry *root)
 397 {
 398         struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
 399         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 400         struct sockaddr *srcaddr;
 401         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 402
 403         seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
 404         cifs_show_security(s, tcon->ses);
 405         cifs_show_cache_flavor(s, cifs_sb);
 406
 407         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 408                 seq_puts(s, ",multiuser");
 409         else if (tcon->ses->user_name)
 410                 seq_show_option(s, "username", tcon->ses->user_name);
 411
 412         if (tcon->ses->domainName)
 413                 seq_show_option(s, "domain", tcon->ses->domainName);
 414
 415         if (srcaddr->sa_family != AF_UNSPEC) {
 416                 struct sockaddr_in *saddr4;
 417                 struct sockaddr_in6 *saddr6;
 418                 saddr4 = (struct sockaddr_in *)srcaddr;
 419                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 420                 if (srcaddr->sa_family == AF_INET6)
 421                         seq_printf(s, ",srcaddr=%pI6c",
 422                                    &saddr6->sin6_addr);
 423                 else if (srcaddr->sa_family == AF_INET)
 424                         seq_printf(s, ",srcaddr=%pI4",
 425                                    &saddr4->sin_addr.s_addr);
 426                 else
 427                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 428                                    (int)(srcaddr->sa_family));
 429         }
 430
 431         seq_printf(s, ",uid=%u",
 432                    from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
 433         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 434                 seq_puts(s, ",forceuid");
 435         else
 436                 seq_puts(s, ",noforceuid");
 437
 438         seq_printf(s, ",gid=%u",
 439                    from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
 440         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 441                 seq_puts(s, ",forcegid");
 442         else
 443                 seq_puts(s, ",noforcegid");
 444
 445         cifs_show_address(s, tcon->ses->server);
 446
 447         if (!tcon->unix_ext)
 448                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 449                                            cifs_sb->mnt_file_mode,
 450                                            cifs_sb->mnt_dir_mode);
 451
 452         cifs_show_nls(s, cifs_sb->local_nls);
 453
 454         if (tcon->seal)
 455                 seq_puts(s, ",seal");
 456         if (tcon->nocase)
 457                 seq_puts(s, ",nocase");
 458         if (tcon->retry)
 459                 seq_puts(s, ",hard");
 460         if (tcon->use_persistent)
 461                 seq_puts(s, ",persistenthandles");
 462         else if (tcon->use_resilient)
 463                 seq_puts(s, ",resilienthandles");
 464         if (tcon->unix_ext)
 465                 seq_puts(s, ",unix");
 466         else
 467                 seq_puts(s, ",nounix");
 468         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 469                 seq_puts(s, ",posixpaths");
 470         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 471                 seq_puts(s, ",setuids");
 472         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
 473                 seq_puts(s, ",idsfromsid");
 474         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 475                 seq_puts(s, ",serverino");
 476         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 477                 seq_puts(s, ",rwpidforward");
 478         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 479                 seq_puts(s, ",forcemand");
 480         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 481                 seq_puts(s, ",nouser_xattr");
 482         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 483                 seq_puts(s, ",mapchars");
 484         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
 485                 seq_puts(s, ",mapposix");
 486         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 487                 seq_puts(s, ",sfu");
 488         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 489                 seq_puts(s, ",nobrl");
 490         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 491                 seq_puts(s, ",cifsacl");
 492         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 493                 seq_puts(s, ",dynperm");
 494         if (root->d_sb->s_flags & MS_POSIXACL)
 495                 seq_puts(s, ",acl");
 496         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 497                 seq_puts(s, ",mfsymlinks");
 498         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 499                 seq_puts(s, ",fsc");
 500         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 501                 seq_puts(s, ",nostrictsync");
 502         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 503                 seq_puts(s, ",noperm");
 504         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 505                 seq_printf(s, ",backupuid=%u",
 506                            from_kuid_munged(&init_user_ns,
 507                                             cifs_sb->mnt_backupuid));
 508         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 509                 seq_printf(s, ",backupgid=%u",
 510                            from_kgid_munged(&init_user_ns,
 511                                             cifs_sb->mnt_backupgid));
 512
 513         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 514         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 515         seq_printf(s, ",echo_interval=%lu",
 516                         tcon->ses->server->echo_interval / HZ);
 517         /* convert actimeo and display it in seconds */
 518         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 519
 520         return 0;
 521 }
 522
 523 static void cifs_umount_begin(struct super_block *sb)
 524 {
 525         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 526         struct cifs_tcon *tcon;
 527
 528         if (cifs_sb == NULL)
 529                 return;
 530
 531         tcon = cifs_sb_master_tcon(cifs_sb);
 532
 533         spin_lock(&cifs_tcp_ses_lock);
 534         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 535                 /* we have other mounts to same share or we have
 536                    already tried to force umount this and woken up
 537                    all waiting network requests, nothing to do */
 538                 spin_unlock(&cifs_tcp_ses_lock);
 539                 return;
 540         } else if (tcon->tc_count == 1)
 541                 tcon->tidStatus = CifsExiting;
 542         spin_unlock(&cifs_tcp_ses_lock);
 543
 544         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 545         /* cancel_notify_requests(tcon); */
 546         if (tcon->ses && tcon->ses->server) {
 547                 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
 548                 wake_up_all(&tcon->ses->server->request_q);
 549                 wake_up_all(&tcon->ses->server->response_q);
 550                 msleep(1); /* yield */
 551                 /* we have to kick the requests once more */
 552                 wake_up_all(&tcon->ses->server->response_q);
 553                 msleep(1);
 554         }
 555
 556         return;
 557 }
 558
 559 #ifdef CONFIG_CIFS_STATS2
 560 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 561 {
 562         /* BB FIXME */
 563         return 0;
 564 }
 565 #endif
 566
 567 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 568 {
 569         sync_filesystem(sb);
 570         *flags |= MS_NODIRATIME;
 571         return 0;
 572 }
 573
 574 static int cifs_drop_inode(struct inode *inode)
 575 {
 576         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 577
 578         /* no serverino => unconditional eviction */
 579         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 580                 generic_drop_inode(inode);
 581 }
 582
 583 static const struct super_operations cifs_super_ops = {
 584         .statfs = cifs_statfs,
 585         .alloc_inode = cifs_alloc_inode,
 586         .destroy_inode = cifs_destroy_inode,
 587         .drop_inode     = cifs_drop_inode,
 588         .evict_inode    = cifs_evict_inode,
 589 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 590         function unless later we add lazy close of inodes or unless the
 591         kernel forgets to call us with the same number of releases (closes)
 592         as opens */
 593         .show_options = cifs_show_options,
 594         .umount_begin   = cifs_umount_begin,
 595         .remount_fs = cifs_remount,
 596 #ifdef CONFIG_CIFS_STATS2
 597         .show_stats = cifs_show_stats,
 598 #endif
 599 };
 600
 601 /*
 602  * Get root dentry from superblock according to prefix path mount option.
 603  * Return dentry with refcount + 1 on success and NULL otherwise.
 604  */
 605 static struct dentry *
 606 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 607 {
 608         struct dentry *dentry;
 609         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 610         char *full_path = NULL;
 611         char *s, *p;
 612         char sep;
 613
 614         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
 615                 return dget(sb->s_root);
 616
 617         full_path = cifs_build_path_to_root(vol, cifs_sb,
 618                                 cifs_sb_master_tcon(cifs_sb), 0);
 619         if (full_path == NULL)
 620                 return ERR_PTR(-ENOMEM);
 621
 622         cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
 623
 624         sep = CIFS_DIR_SEP(cifs_sb);
 625         dentry = dget(sb->s_root);
 626         p = s = full_path;
 627
 628         do {
 629                 struct inode *dir = d_inode(dentry);
 630                 struct dentry *child;
 631
 632                 if (!dir) {
 633                         dput(dentry);
 634                         dentry = ERR_PTR(-ENOENT);
 635                         break;
 636                 }
 637                 if (!S_ISDIR(dir->i_mode)) {
 638                         dput(dentry);
 639                         dentry = ERR_PTR(-ENOTDIR);
 640                         break;
 641                 }
 642
 643                 /* skip separators */
 644                 while (*s == sep)
 645                         s++;
 646                 if (!*s)
 647                         break;
 648                 p = s++;
 649                 /* next separator */
 650                 while (*s && *s != sep)
 651                         s++;
 652
 653                 child = lookup_one_len_unlocked(p, dentry, s - p);
 654                 dput(dentry);
 655                 dentry = child;
 656         } while (!IS_ERR(dentry));
 657         kfree(full_path);
 658         return dentry;
 659 }
 660
 661 static int cifs_set_super(struct super_block *sb, void *data)
 662 {
 663         struct cifs_mnt_data *mnt_data = data;
 664         sb->s_fs_info = mnt_data->cifs_sb;
 665         return set_anon_super(sb, NULL);
 666 }
 667
 668 static struct dentry *
 669 cifs_do_mount(struct file_system_type *fs_type,
 670               int flags, const char *dev_name, void *data)
 671 {
 672         int rc;
 673         struct super_block *sb;
 674         struct cifs_sb_info *cifs_sb;
 675         struct smb_vol *volume_info;
 676         struct cifs_mnt_data mnt_data;
 677         struct dentry *root;
 678
 679         cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
 680
 681         volume_info = cifs_get_volume_info((char *)data, dev_name);
 682         if (IS_ERR(volume_info))
 683                 return ERR_CAST(volume_info);
 684
 685         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 686         if (cifs_sb == NULL) {
 687                 root = ERR_PTR(-ENOMEM);
 688                 goto out_nls;
 689         }
 690
 691         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 692         if (cifs_sb->mountdata == NULL) {
 693                 root = ERR_PTR(-ENOMEM);
 694                 goto out_free;
 695         }
 696
 697         rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
 698         if (rc) {
 699                 root = ERR_PTR(rc);
 700                 goto out_free;
 701         }
 702
 703         rc = cifs_mount(cifs_sb, volume_info);
 704         if (rc) {
 705                 if (!(flags & MS_SILENT))
 706                         cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
 707                                  rc);
 708                 root = ERR_PTR(rc);
 709                 goto out_free;
 710         }
 711
 712         mnt_data.vol = volume_info;
 713         mnt_data.cifs_sb = cifs_sb;
 714         mnt_data.flags = flags;
 715
 716         /* BB should we make this contingent on mount parm? */
 717         flags |= MS_NODIRATIME | MS_NOATIME;
 718
 719         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 720         if (IS_ERR(sb)) {
 721                 root = ERR_CAST(sb);
 722                 cifs_umount(cifs_sb);
 723                 goto out;
 724         }
 725
 726         if (sb->s_root) {
 727                 cifs_dbg(FYI, "Use existing superblock\n");
 728                 cifs_umount(cifs_sb);
 729         } else {
 730                 rc = cifs_read_super(sb);
 731                 if (rc) {
 732                         root = ERR_PTR(rc);
 733                         goto out_super;
 734                 }
 735
 736                 sb->s_flags |= MS_ACTIVE;
 737         }
 738
 739         root = cifs_get_root(volume_info, sb);
 740         if (IS_ERR(root))
 741                 goto out_super;
 742
 743         cifs_dbg(FYI, "dentry root is: %p\n", root);
 744         goto out;
 745
 746 out_super:
 747         deactivate_locked_super(sb);
 748 out:
 749         cifs_cleanup_volume_info(volume_info);
 750         return root;
 751
 752 out_free:
 753         kfree(cifs_sb->prepath);
 754         kfree(cifs_sb->mountdata);
 755         kfree(cifs_sb);
 756 out_nls:
 757         unload_nls(volume_info->local_nls);
 758         goto out;
 759 }
 760
 761 static ssize_t
 762 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 763 {
 764         ssize_t rc;
 765         struct inode *inode = file_inode(iocb->ki_filp);
 766
 767         if (iocb->ki_filp->f_flags & O_DIRECT)
 768                 return cifs_user_readv(iocb, iter);
 769
 770         rc = cifs_revalidate_mapping(inode);
 771         if (rc)
 772                 return rc;
 773
 774         return generic_file_read_iter(iocb, iter);
 775 }
 776
 777 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 778 {
 779         struct inode *inode = file_inode(iocb->ki_filp);
 780         struct cifsInodeInfo *cinode = CIFS_I(inode);
 781         ssize_t written;
 782         int rc;
 783
 784         if (iocb->ki_filp->f_flags & O_DIRECT) {
 785                 written = cifs_user_writev(iocb, from);
 786                 if (written > 0 && CIFS_CACHE_READ(cinode)) {
 787                         cifs_zap_mapping(inode);
 788                         cifs_dbg(FYI,
 789                                  "Set no oplock for inode=%p after a write operation\n",
 790                                  inode);
 791                         cinode->oplock = 0;
 792                 }
 793                 return written;
 794         }
 795
 796         written = cifs_get_writer(cinode);
 797         if (written)
 798                 return written;
 799
 800         written = generic_file_write_iter(iocb, from);
 801
 802         if (CIFS_CACHE_WRITE(CIFS_I(inode)))
 803                 goto out;
 804
 805         rc = filemap_fdatawrite(inode->i_mapping);
 806         if (rc)
 807                 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
 808                          rc, inode);
 809
 810 out:
 811         cifs_put_writer(cinode);
 812         return written;
 813 }
 814
 815 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
 816 {
 817         /*
 818          * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 819          * the cached file length
 820          */
 821         if (whence != SEEK_SET && whence != SEEK_CUR) {
 822                 int rc;
 823                 struct inode *inode = file_inode(file);
 824
 825                 /*
 826                  * We need to be sure that all dirty pages are written and the
 827                  * server has the newest file length.
 828                  */
 829                 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
 830                     inode->i_mapping->nrpages != 0) {
 831                         rc = filemap_fdatawait(inode->i_mapping);
 832                         if (rc) {
 833                                 mapping_set_error(inode->i_mapping, rc);
 834                                 return rc;
 835                         }
 836                 }
 837                 /*
 838                  * Some applications poll for the file length in this strange
 839                  * way so we must seek to end on non-oplocked files by
 840                  * setting the revalidate time to zero.
 841                  */
 842                 CIFS_I(inode)->time = 0;
 843
 844                 rc = cifs_revalidate_file_attr(file);
 845                 if (rc < 0)
 846                         return (loff_t)rc;
 847         }
 848         return generic_file_llseek(file, offset, whence);
 849 }
 850
 851 static int
 852 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
 853 {
 854         /*
 855          * Note that this is called by vfs setlease with i_lock held to
 856          * protect *lease from going away.
 857          */
 858         struct inode *inode = file_inode(file);
 859         struct cifsFileInfo *cfile = file->private_data;
 860
 861         if (!(S_ISREG(inode->i_mode)))
 862                 return -EINVAL;
 863
 864         /* Check if file is oplocked if this is request for new lease */
 865         if (arg == F_UNLCK ||
 866             ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
 867             ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
 868                 return generic_setlease(file, arg, lease, priv);
 869         else if (tlink_tcon(cfile->tlink)->local_lease &&
 870                  !CIFS_CACHE_READ(CIFS_I(inode)))
 871                 /*
 872                  * If the server claims to support oplock on this file, then we
 873                  * still need to check oplock even if the local_lease mount
 874                  * option is set, but there are servers which do not support
 875                  * oplock for which this mount option may be useful if the user
 876                  * knows that the file won't be changed on the server by anyone
 877                  * else.
 878                  */
 879                 return generic_setlease(file, arg, lease, priv);
 880         else
 881                 return -EAGAIN;
 882 }
 883
 884 struct file_system_type cifs_fs_type = {
 885         .owner = THIS_MODULE,
 886         .name = "cifs",
 887         .mount = cifs_do_mount,
 888         .kill_sb = cifs_kill_sb,
 889         /*  .fs_flags */
 890 };
 891 MODULE_ALIAS_FS("cifs");
 892 const struct inode_operations cifs_dir_inode_ops = {
 893         .create = cifs_create,
 894         .atomic_open = cifs_atomic_open,
 895         .lookup = cifs_lookup,
 896         .getattr = cifs_getattr,
 897         .unlink = cifs_unlink,
 898         .link = cifs_hardlink,
 899         .mkdir = cifs_mkdir,
 900         .rmdir = cifs_rmdir,
 901         .rename = cifs_rename2,
 902         .permission = cifs_permission,
 903         .setattr = cifs_setattr,
 904         .symlink = cifs_symlink,
 905         .mknod   = cifs_mknod,
 906         .listxattr = cifs_listxattr,
 907 };
 908
 909 const struct inode_operations cifs_file_inode_ops = {
 910         .setattr = cifs_setattr,
 911         .getattr = cifs_getattr,
 912         .permission = cifs_permission,
 913         .listxattr = cifs_listxattr,
 914 };
 915
 916 const struct inode_operations cifs_symlink_inode_ops = {
 917         .get_link = cifs_get_link,
 918         .permission = cifs_permission,
 919         .listxattr = cifs_listxattr,
 920 };
 921
 922 static int cifs_clone_file_range(struct file *src_file, loff_t off,
 923                 struct file *dst_file, loff_t destoff, u64 len)
 924 {
 925         struct inode *src_inode = file_inode(src_file);
 926         struct inode *target_inode = file_inode(dst_file);
 927         struct cifsFileInfo *smb_file_src = src_file->private_data;
 928         struct cifsFileInfo *smb_file_target = dst_file->private_data;
 929         struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
 930         unsigned int xid;
 931         int rc;
 932
 933         cifs_dbg(FYI, "clone range\n");
 934
 935         xid = get_xid();
 936
 937         if (!src_file->private_data || !dst_file->private_data) {
 938                 rc = -EBADF;
 939                 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
 940                 goto out;
 941         }
 942
 943         /*
 944          * Note: cifs case is easier than btrfs since server responsible for
 945          * checks for proper open modes and file type and if it wants
 946          * server could even support copy of range where source = target
 947          */
 948         lock_two_nondirectories(target_inode, src_inode);
 949
 950         if (len == 0)
 951                 len = src_inode->i_size - off;
 952
 953         cifs_dbg(FYI, "about to flush pages\n");
 954         /* should we flush first and last page first */
 955         truncate_inode_pages_range(&target_inode->i_data, destoff,
 956                                    PAGE_ALIGN(destoff + len)-1);
 957
 958         if (target_tcon->ses->server->ops->duplicate_extents)
 959                 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
 960                         smb_file_src, smb_file_target, off, len, destoff);
 961         else
 962                 rc = -EOPNOTSUPP;
 963
 964         /* force revalidate of size and timestamps of target file now
 965            that target is updated on the server */
 966         CIFS_I(target_inode)->time = 0;
 967         /* although unlocking in the reverse order from locking is not
 968            strictly necessary here it is a little cleaner to be consistent */
 969         unlock_two_nondirectories(src_inode, target_inode);
 970 out:
 971         free_xid(xid);
 972         return rc;
 973 }
 974
 975 const struct file_operations cifs_file_ops = {
 976         .read_iter = cifs_loose_read_iter,
 977         .write_iter = cifs_file_write_iter,
 978         .open = cifs_open,
 979         .release = cifs_close,
 980         .lock = cifs_lock,
 981         .fsync = cifs_fsync,
 982         .flush = cifs_flush,
 983         .mmap  = cifs_file_mmap,
 984         .splice_read = generic_file_splice_read,
 985         .llseek = cifs_llseek,
 986         .unlocked_ioctl = cifs_ioctl,
 987         .clone_file_range = cifs_clone_file_range,
 988         .setlease = cifs_setlease,
 989         .fallocate = cifs_fallocate,
 990 };
 991
 992 const struct file_operations cifs_file_strict_ops = {
 993         .read_iter = cifs_strict_readv,
 994         .write_iter = cifs_strict_writev,
 995         .open = cifs_open,
 996         .release = cifs_close,
 997         .lock = cifs_lock,
 998         .fsync = cifs_strict_fsync,
 999         .flush = cifs_flush,
1000         .mmap = cifs_file_strict_mmap,
1001         .splice_read = generic_file_splice_read,
1002         .llseek = cifs_llseek,
1003         .unlocked_ioctl = cifs_ioctl,
1004         .clone_file_range = cifs_clone_file_range,
1005         .setlease = cifs_setlease,
1006         .fallocate = cifs_fallocate,
1007 };
1008
1009 const struct file_operations cifs_file_direct_ops = {
1010         /* BB reevaluate whether they can be done with directio, no cache */
1011         .read_iter = cifs_user_readv,
1012         .write_iter = cifs_user_writev,
1013         .open = cifs_open,
1014         .release = cifs_close,
1015         .lock = cifs_lock,
1016         .fsync = cifs_fsync,
1017         .flush = cifs_flush,
1018         .mmap = cifs_file_mmap,
1019         .splice_read = generic_file_splice_read,
1020         .unlocked_ioctl  = cifs_ioctl,
1021         .clone_file_range = cifs_clone_file_range,
1022         .llseek = cifs_llseek,
1023         .setlease = cifs_setlease,
1024         .fallocate = cifs_fallocate,
1025 };
1026
1027 const struct file_operations cifs_file_nobrl_ops = {
1028         .read_iter = cifs_loose_read_iter,
1029         .write_iter = cifs_file_write_iter,
1030         .open = cifs_open,
1031         .release = cifs_close,
1032         .fsync = cifs_fsync,
1033         .flush = cifs_flush,
1034         .mmap  = cifs_file_mmap,
1035         .splice_read = generic_file_splice_read,
1036         .llseek = cifs_llseek,
1037         .unlocked_ioctl = cifs_ioctl,
1038         .clone_file_range = cifs_clone_file_range,
1039         .setlease = cifs_setlease,
1040         .fallocate = cifs_fallocate,
1041 };
1042
1043 const struct file_operations cifs_file_strict_nobrl_ops = {
1044         .read_iter = cifs_strict_readv,
1045         .write_iter = cifs_strict_writev,
1046         .open = cifs_open,
1047         .release = cifs_close,
1048         .fsync = cifs_strict_fsync,
1049         .flush = cifs_flush,
1050         .mmap = cifs_file_strict_mmap,
1051         .splice_read = generic_file_splice_read,
1052         .llseek = cifs_llseek,
1053         .unlocked_ioctl = cifs_ioctl,
1054         .clone_file_range = cifs_clone_file_range,
1055         .setlease = cifs_setlease,
1056         .fallocate = cifs_fallocate,
1057 };
1058
1059 const struct file_operations cifs_file_direct_nobrl_ops = {
1060         /* BB reevaluate whether they can be done with directio, no cache */
1061         .read_iter = cifs_user_readv,
1062         .write_iter = cifs_user_writev,
1063         .open = cifs_open,
1064         .release = cifs_close,
1065         .fsync = cifs_fsync,
1066         .flush = cifs_flush,
1067         .mmap = cifs_file_mmap,
1068         .splice_read = generic_file_splice_read,
1069         .unlocked_ioctl  = cifs_ioctl,
1070         .clone_file_range = cifs_clone_file_range,
1071         .llseek = cifs_llseek,
1072         .setlease = cifs_setlease,
1073         .fallocate = cifs_fallocate,
1074 };
1075
1076 const struct file_operations cifs_dir_ops = {
1077         .iterate_shared = cifs_readdir,
1078         .release = cifs_closedir,
1079         .read    = generic_read_dir,
1080         .unlocked_ioctl  = cifs_ioctl,
1081         .clone_file_range = cifs_clone_file_range,
1082         .llseek = generic_file_llseek,
1083 };
1084
1085 static void
1086 cifs_init_once(void *inode)
1087 {
1088         struct cifsInodeInfo *cifsi = inode;
1089
1090         inode_init_once(&cifsi->vfs_inode);
1091         init_rwsem(&cifsi->lock_sem);
1092 }
1093
1094 static int __init
1095 cifs_init_inodecache(void)
1096 {
1097         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1098                                               sizeof(struct cifsInodeInfo),
1099                                               0, (SLAB_RECLAIM_ACCOUNT|
1100                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1101                                               cifs_init_once);
1102         if (cifs_inode_cachep == NULL)
1103                 return -ENOMEM;
1104
1105         return 0;
1106 }
1107
1108 static void
1109 cifs_destroy_inodecache(void)
1110 {
1111         /*
1112          * Make sure all delayed rcu free inodes are flushed before we
1113          * destroy cache.
1114          */
1115         rcu_barrier();
1116         kmem_cache_destroy(cifs_inode_cachep);
1117 }
1118
1119 static int
1120 cifs_init_request_bufs(void)
1121 {
1122         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1123 #ifdef CONFIG_CIFS_SMB2
1124         /*
1125          * SMB2 maximum header size is bigger than CIFS one - no problems to
1126          * allocate some more bytes for CIFS.
1127          */
1128         max_hdr_size = MAX_SMB2_HDR_SIZE;
1129 #endif
1130         if (CIFSMaxBufSize < 8192) {
1131         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1132         Unicode path name has to fit in any SMB/CIFS path based frames */
1133                 CIFSMaxBufSize = 8192;
1134         } else if (CIFSMaxBufSize > 1024*127) {
1135                 CIFSMaxBufSize = 1024 * 127;
1136         } else {
1137                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1138         }
1139 /*
1140         cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1141                  CIFSMaxBufSize, CIFSMaxBufSize);
1142 */
1143         cifs_req_cachep = kmem_cache_create("cifs_request",
1144                                             CIFSMaxBufSize + max_hdr_size, 0,
1145                                             SLAB_HWCACHE_ALIGN, NULL);
1146         if (cifs_req_cachep == NULL)
1147                 return -ENOMEM;
1148
1149         if (cifs_min_rcv < 1)
1150                 cifs_min_rcv = 1;
1151         else if (cifs_min_rcv > 64) {
1152                 cifs_min_rcv = 64;
1153                 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1154         }
1155
1156         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1157                                                   cifs_req_cachep);
1158
1159         if (cifs_req_poolp == NULL) {
1160                 kmem_cache_destroy(cifs_req_cachep);
1161                 return -ENOMEM;
1162         }
1163         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1164         almost all handle based requests (but not write response, nor is it
1165         sufficient for path based requests).  A smaller size would have
1166         been more efficient (compacting multiple slab items on one 4k page)
1167         for the case in which debug was on, but this larger size allows
1168         more SMBs to use small buffer alloc and is still much more
1169         efficient to alloc 1 per page off the slab compared to 17K (5page)
1170         alloc of large cifs buffers even when page debugging is on */
1171         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1172                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1173                         NULL);
1174         if (cifs_sm_req_cachep == NULL) {
1175                 mempool_destroy(cifs_req_poolp);
1176                 kmem_cache_destroy(cifs_req_cachep);
1177                 return -ENOMEM;
1178         }
1179
1180         if (cifs_min_small < 2)
1181                 cifs_min_small = 2;
1182         else if (cifs_min_small > 256) {
1183                 cifs_min_small = 256;
1184                 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1185         }
1186
1187         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1188                                                      cifs_sm_req_cachep);
1189
1190         if (cifs_sm_req_poolp == NULL) {
1191                 mempool_destroy(cifs_req_poolp);
1192                 kmem_cache_destroy(cifs_req_cachep);
1193                 kmem_cache_destroy(cifs_sm_req_cachep);
1194                 return -ENOMEM;
1195         }
1196
1197         return 0;
1198 }
1199
1200 static void
1201 cifs_destroy_request_bufs(void)
1202 {
1203         mempool_destroy(cifs_req_poolp);
1204         kmem_cache_destroy(cifs_req_cachep);
1205         mempool_destroy(cifs_sm_req_poolp);
1206         kmem_cache_destroy(cifs_sm_req_cachep);
1207 }
1208
1209 static int
1210 cifs_init_mids(void)
1211 {
1212         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1213                                             sizeof(struct mid_q_entry), 0,
1214                                             SLAB_HWCACHE_ALIGN, NULL);
1215         if (cifs_mid_cachep == NULL)
1216                 return -ENOMEM;
1217
1218         /* 3 is a reasonable minimum number of simultaneous operations */
1219         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1220         if (cifs_mid_poolp == NULL) {
1221                 kmem_cache_destroy(cifs_mid_cachep);
1222                 return -ENOMEM;
1223         }
1224
1225         return 0;
1226 }
1227
1228 static void
1229 cifs_destroy_mids(void)
1230 {
1231         mempool_destroy(cifs_mid_poolp);
1232         kmem_cache_destroy(cifs_mid_cachep);
1233 }
1234
1235 static int __init
1236 init_cifs(void)
1237 {
1238         int rc = 0;
1239         cifs_proc_init();
1240         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1241 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1242         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1243         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1244 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1245 /*
1246  *  Initialize Global counters
1247  */
1248         atomic_set(&sesInfoAllocCount, 0);
1249         atomic_set(&tconInfoAllocCount, 0);
1250         atomic_set(&tcpSesAllocCount, 0);
1251         atomic_set(&tcpSesReconnectCount, 0);
1252         atomic_set(&tconInfoReconnectCount, 0);
1253
1254         atomic_set(&bufAllocCount, 0);
1255         atomic_set(&smBufAllocCount, 0);
1256 #ifdef CONFIG_CIFS_STATS2
1257         atomic_set(&totBufAllocCount, 0);
1258         atomic_set(&totSmBufAllocCount, 0);
1259 #endif /* CONFIG_CIFS_STATS2 */
1260
1261         atomic_set(&midCount, 0);
1262         GlobalCurrentXid = 0;
1263         GlobalTotalActiveXid = 0;
1264         GlobalMaxActiveXid = 0;
1265         spin_lock_init(&cifs_tcp_ses_lock);
1266         spin_lock_init(&GlobalMid_Lock);
1267
1268         get_random_bytes(&cifs_lock_secret, sizeof(cifs_lock_secret));
1269
1270         if (cifs_max_pending < 2) {
1271                 cifs_max_pending = 2;
1272                 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1273         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1274                 cifs_max_pending = CIFS_MAX_REQ;
1275                 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1276                          CIFS_MAX_REQ);
1277         }
1278
1279         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1280         if (!cifsiod_wq) {
1281                 rc = -ENOMEM;
1282                 goto out_clean_proc;
1283         }
1284
1285         rc = cifs_fscache_register();
1286         if (rc)
1287                 goto out_destroy_wq;
1288
1289         rc = cifs_init_inodecache();
1290         if (rc)
1291                 goto out_unreg_fscache;
1292
1293         rc = cifs_init_mids();
1294         if (rc)
1295                 goto out_destroy_inodecache;
1296
1297         rc = cifs_init_request_bufs();
1298         if (rc)
1299                 goto out_destroy_mids;
1300
1301 #ifdef CONFIG_CIFS_UPCALL
1302         rc = init_cifs_spnego();
1303         if (rc)
1304                 goto out_destroy_request_bufs;
1305 #endif /* CONFIG_CIFS_UPCALL */
1306
1307 #ifdef CONFIG_CIFS_ACL
1308         rc = init_cifs_idmap();
1309         if (rc)
1310                 goto out_register_key_type;
1311 #endif /* CONFIG_CIFS_ACL */
1312
1313         rc = register_filesystem(&cifs_fs_type);
1314         if (rc)
1315                 goto out_init_cifs_idmap;
1316
1317         return 0;
1318
1319 out_init_cifs_idmap:
1320 #ifdef CONFIG_CIFS_ACL
1321         exit_cifs_idmap();
1322 out_register_key_type:
1323 #endif
1324 #ifdef CONFIG_CIFS_UPCALL
1325         exit_cifs_spnego();
1326 out_destroy_request_bufs:
1327 #endif
1328         cifs_destroy_request_bufs();
1329 out_destroy_mids:
1330         cifs_destroy_mids();
1331 out_destroy_inodecache:
1332         cifs_destroy_inodecache();
1333 out_unreg_fscache:
1334         cifs_fscache_unregister();
1335 out_destroy_wq:
1336         destroy_workqueue(cifsiod_wq);
1337 out_clean_proc:
1338         cifs_proc_clean();
1339         return rc;
1340 }
1341
1342 static void __exit
1343 exit_cifs(void)
1344 {
1345         cifs_dbg(NOISY, "exit_cifs\n");
1346         unregister_filesystem(&cifs_fs_type);
1347         cifs_dfs_release_automount_timer();
1348 #ifdef CONFIG_CIFS_ACL
1349         exit_cifs_idmap();
1350 #endif
1351 #ifdef CONFIG_CIFS_UPCALL
1352         unregister_key_type(&cifs_spnego_key_type);
1353 #endif
1354         cifs_destroy_request_bufs();
1355         cifs_destroy_mids();
1356         cifs_destroy_inodecache();
1357         cifs_fscache_unregister();
1358         destroy_workqueue(cifsiod_wq);
1359         cifs_proc_clean();
1360 }
1361
1362 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1363 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1364 MODULE_DESCRIPTION
1365     ("VFS to access servers complying with the SNIA CIFS Specification "
1366      "e.g. Samba and Windows");
1367 MODULE_VERSION(CIFS_VERSION);
1368 module_init(init_cifs)
1369 module_exit(exit_cifs)