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, 0);
  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, 0);
  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, 0);
  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         get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
 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_SERVER_INUM)
 473                 seq_puts(s, ",serverino");
 474         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 475                 seq_puts(s, ",rwpidforward");
 476         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 477                 seq_puts(s, ",forcemand");
 478         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 479                 seq_puts(s, ",nouser_xattr");
 480         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 481                 seq_puts(s, ",mapchars");
 482         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
 483                 seq_puts(s, ",mapposix");
 484         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 485                 seq_puts(s, ",sfu");
 486         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 487                 seq_puts(s, ",nobrl");
 488         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 489                 seq_puts(s, ",cifsacl");
 490         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 491                 seq_puts(s, ",dynperm");
 492         if (root->d_sb->s_flags & MS_POSIXACL)
 493                 seq_puts(s, ",acl");
 494         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 495                 seq_puts(s, ",mfsymlinks");
 496         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 497                 seq_puts(s, ",fsc");
 498         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 499                 seq_puts(s, ",nostrictsync");
 500         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 501                 seq_puts(s, ",noperm");
 502         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 503                 seq_printf(s, ",backupuid=%u",
 504                            from_kuid_munged(&init_user_ns,
 505                                             cifs_sb->mnt_backupuid));
 506         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 507                 seq_printf(s, ",backupgid=%u",
 508                            from_kgid_munged(&init_user_ns,
 509                                             cifs_sb->mnt_backupgid));
 510
 511         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 512         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 513         seq_printf(s, ",echo_interval=%lu",
 514                         tcon->ses->server->echo_interval / HZ);
 515         /* convert actimeo and display it in seconds */
 516         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 517
 518         return 0;
 519 }
 520
 521 static void cifs_umount_begin(struct super_block *sb)
 522 {
 523         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 524         struct cifs_tcon *tcon;
 525
 526         if (cifs_sb == NULL)
 527                 return;
 528
 529         tcon = cifs_sb_master_tcon(cifs_sb);
 530
 531         spin_lock(&cifs_tcp_ses_lock);
 532         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 533                 /* we have other mounts to same share or we have
 534                    already tried to force umount this and woken up
 535                    all waiting network requests, nothing to do */
 536                 spin_unlock(&cifs_tcp_ses_lock);
 537                 return;
 538         } else if (tcon->tc_count == 1)
 539                 tcon->tidStatus = CifsExiting;
 540         spin_unlock(&cifs_tcp_ses_lock);
 541
 542         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 543         /* cancel_notify_requests(tcon); */
 544         if (tcon->ses && tcon->ses->server) {
 545                 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
 546                 wake_up_all(&tcon->ses->server->request_q);
 547                 wake_up_all(&tcon->ses->server->response_q);
 548                 msleep(1); /* yield */
 549                 /* we have to kick the requests once more */
 550                 wake_up_all(&tcon->ses->server->response_q);
 551                 msleep(1);
 552         }
 553
 554         return;
 555 }
 556
 557 #ifdef CONFIG_CIFS_STATS2
 558 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 559 {
 560         /* BB FIXME */
 561         return 0;
 562 }
 563 #endif
 564
 565 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 566 {
 567         sync_filesystem(sb);
 568         *flags |= MS_NODIRATIME;
 569         return 0;
 570 }
 571
 572 static int cifs_drop_inode(struct inode *inode)
 573 {
 574         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 575
 576         /* no serverino => unconditional eviction */
 577         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 578                 generic_drop_inode(inode);
 579 }
 580
 581 static const struct super_operations cifs_super_ops = {
 582         .statfs = cifs_statfs,
 583         .alloc_inode = cifs_alloc_inode,
 584         .destroy_inode = cifs_destroy_inode,
 585         .drop_inode     = cifs_drop_inode,
 586         .evict_inode    = cifs_evict_inode,
 587 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 588         function unless later we add lazy close of inodes or unless the
 589         kernel forgets to call us with the same number of releases (closes)
 590         as opens */
 591         .show_options = cifs_show_options,
 592         .umount_begin   = cifs_umount_begin,
 593         .remount_fs = cifs_remount,
 594 #ifdef CONFIG_CIFS_STATS2
 595         .show_stats = cifs_show_stats,
 596 #endif
 597 };
 598
 599 /*
 600  * Get root dentry from superblock according to prefix path mount option.
 601  * Return dentry with refcount + 1 on success and NULL otherwise.
 602  */
 603 static struct dentry *
 604 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 605 {
 606         struct dentry *dentry;
 607         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 608         char *full_path = NULL;
 609         char *s, *p;
 610         char sep;
 611
 612         full_path = cifs_build_path_to_root(vol, cifs_sb,
 613                                             cifs_sb_master_tcon(cifs_sb));
 614         if (full_path == NULL)
 615                 return ERR_PTR(-ENOMEM);
 616
 617         cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
 618
 619         sep = CIFS_DIR_SEP(cifs_sb);
 620         dentry = dget(sb->s_root);
 621         p = s = full_path;
 622
 623         do {
 624                 struct inode *dir = d_inode(dentry);
 625                 struct dentry *child;
 626
 627                 if (!dir) {
 628                         dput(dentry);
 629                         dentry = ERR_PTR(-ENOENT);
 630                         break;
 631                 }
 632                 if (!S_ISDIR(dir->i_mode)) {
 633                         dput(dentry);
 634                         dentry = ERR_PTR(-ENOTDIR);
 635                         break;
 636                 }
 637
 638                 /* skip separators */
 639                 while (*s == sep)
 640                         s++;
 641                 if (!*s)
 642                         break;
 643                 p = s++;
 644                 /* next separator */
 645                 while (*s && *s != sep)
 646                         s++;
 647
 648                 child = lookup_one_len_unlocked(p, dentry, s - p);
 649                 dput(dentry);
 650                 dentry = child;
 651         } while (!IS_ERR(dentry));
 652         kfree(full_path);
 653         return dentry;
 654 }
 655
 656 static int cifs_set_super(struct super_block *sb, void *data)
 657 {
 658         struct cifs_mnt_data *mnt_data = data;
 659         sb->s_fs_info = mnt_data->cifs_sb;
 660         return set_anon_super(sb, NULL);
 661 }
 662
 663 static struct dentry *
 664 cifs_do_mount(struct file_system_type *fs_type,
 665               int flags, const char *dev_name, void *data)
 666 {
 667         int rc;
 668         struct super_block *sb;
 669         struct cifs_sb_info *cifs_sb;
 670         struct smb_vol *volume_info;
 671         struct cifs_mnt_data mnt_data;
 672         struct dentry *root;
 673
 674         cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
 675
 676         volume_info = cifs_get_volume_info((char *)data, dev_name);
 677         if (IS_ERR(volume_info))
 678                 return ERR_CAST(volume_info);
 679
 680         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 681         if (cifs_sb == NULL) {
 682                 root = ERR_PTR(-ENOMEM);
 683                 goto out_nls;
 684         }
 685
 686         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 687         if (cifs_sb->mountdata == NULL) {
 688                 root = ERR_PTR(-ENOMEM);
 689                 goto out_cifs_sb;
 690         }
 691
 692         cifs_setup_cifs_sb(volume_info, cifs_sb);
 693
 694         rc = cifs_mount(cifs_sb, volume_info);
 695         if (rc) {
 696                 if (!(flags & MS_SILENT))
 697                         cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
 698                                  rc);
 699                 root = ERR_PTR(rc);
 700                 goto out_mountdata;
 701         }
 702
 703         mnt_data.vol = volume_info;
 704         mnt_data.cifs_sb = cifs_sb;
 705         mnt_data.flags = flags;
 706
 707         /* BB should we make this contingent on mount parm? */
 708         flags |= MS_NODIRATIME | MS_NOATIME;
 709
 710         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 711         if (IS_ERR(sb)) {
 712                 root = ERR_CAST(sb);
 713                 cifs_umount(cifs_sb);
 714                 goto out;
 715         }
 716
 717         if (sb->s_root) {
 718                 cifs_dbg(FYI, "Use existing superblock\n");
 719                 cifs_umount(cifs_sb);
 720         } else {
 721                 rc = cifs_read_super(sb);
 722                 if (rc) {
 723                         root = ERR_PTR(rc);
 724                         goto out_super;
 725                 }
 726
 727                 sb->s_flags |= MS_ACTIVE;
 728         }
 729
 730         root = cifs_get_root(volume_info, sb);
 731         if (IS_ERR(root))
 732                 goto out_super;
 733
 734         cifs_dbg(FYI, "dentry root is: %p\n", root);
 735         goto out;
 736
 737 out_super:
 738         deactivate_locked_super(sb);
 739 out:
 740         cifs_cleanup_volume_info(volume_info);
 741         return root;
 742
 743 out_mountdata:
 744         kfree(cifs_sb->mountdata);
 745 out_cifs_sb:
 746         kfree(cifs_sb);
 747 out_nls:
 748         unload_nls(volume_info->local_nls);
 749         goto out;
 750 }
 751
 752 static ssize_t
 753 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 754 {
 755         ssize_t rc;
 756         struct inode *inode = file_inode(iocb->ki_filp);
 757
 758         if (iocb->ki_filp->f_flags & O_DIRECT)
 759                 return cifs_user_readv(iocb, iter);
 760
 761         rc = cifs_revalidate_mapping(inode);
 762         if (rc)
 763                 return rc;
 764
 765         return generic_file_read_iter(iocb, iter);
 766 }
 767
 768 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 769 {
 770         struct inode *inode = file_inode(iocb->ki_filp);
 771         struct cifsInodeInfo *cinode = CIFS_I(inode);
 772         ssize_t written;
 773         int rc;
 774
 775         if (iocb->ki_filp->f_flags & O_DIRECT) {
 776                 written = cifs_user_writev(iocb, from);
 777                 if (written > 0 && CIFS_CACHE_READ(cinode)) {
 778                         cifs_zap_mapping(inode);
 779                         cifs_dbg(FYI,
 780                                  "Set no oplock for inode=%p after a write operation\n",
 781                                  inode);
 782                         cinode->oplock = 0;
 783                 }
 784                 return written;
 785         }
 786
 787         written = cifs_get_writer(cinode);
 788         if (written)
 789                 return written;
 790
 791         written = generic_file_write_iter(iocb, from);
 792
 793         if (CIFS_CACHE_WRITE(CIFS_I(inode)))
 794                 goto out;
 795
 796         rc = filemap_fdatawrite(inode->i_mapping);
 797         if (rc)
 798                 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
 799                          rc, inode);
 800
 801 out:
 802         cifs_put_writer(cinode);
 803         return written;
 804 }
 805
 806 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
 807 {
 808         /*
 809          * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 810          * the cached file length
 811          */
 812         if (whence != SEEK_SET && whence != SEEK_CUR) {
 813                 int rc;
 814                 struct inode *inode = file_inode(file);
 815
 816                 /*
 817                  * We need to be sure that all dirty pages are written and the
 818                  * server has the newest file length.
 819                  */
 820                 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
 821                     inode->i_mapping->nrpages != 0) {
 822                         rc = filemap_fdatawait(inode->i_mapping);
 823                         if (rc) {
 824                                 mapping_set_error(inode->i_mapping, rc);
 825                                 return rc;
 826                         }
 827                 }
 828                 /*
 829                  * Some applications poll for the file length in this strange
 830                  * way so we must seek to end on non-oplocked files by
 831                  * setting the revalidate time to zero.
 832                  */
 833                 CIFS_I(inode)->time = 0;
 834
 835                 rc = cifs_revalidate_file_attr(file);
 836                 if (rc < 0)
 837                         return (loff_t)rc;
 838         }
 839         return generic_file_llseek(file, offset, whence);
 840 }
 841
 842 static int
 843 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
 844 {
 845         /*
 846          * Note that this is called by vfs setlease with i_lock held to
 847          * protect *lease from going away.
 848          */
 849         struct inode *inode = file_inode(file);
 850         struct cifsFileInfo *cfile = file->private_data;
 851
 852         if (!(S_ISREG(inode->i_mode)))
 853                 return -EINVAL;
 854
 855         /* Check if file is oplocked if this is request for new lease */
 856         if (arg == F_UNLCK ||
 857             ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
 858             ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
 859                 return generic_setlease(file, arg, lease, priv);
 860         else if (tlink_tcon(cfile->tlink)->local_lease &&
 861                  !CIFS_CACHE_READ(CIFS_I(inode)))
 862                 /*
 863                  * If the server claims to support oplock on this file, then we
 864                  * still need to check oplock even if the local_lease mount
 865                  * option is set, but there are servers which do not support
 866                  * oplock for which this mount option may be useful if the user
 867                  * knows that the file won't be changed on the server by anyone
 868                  * else.
 869                  */
 870                 return generic_setlease(file, arg, lease, priv);
 871         else
 872                 return -EAGAIN;
 873 }
 874
 875 struct file_system_type cifs_fs_type = {
 876         .owner = THIS_MODULE,
 877         .name = "cifs",
 878         .mount = cifs_do_mount,
 879         .kill_sb = cifs_kill_sb,
 880         /*  .fs_flags */
 881 };
 882 MODULE_ALIAS_FS("cifs");
 883 const struct inode_operations cifs_dir_inode_ops = {
 884         .create = cifs_create,
 885         .atomic_open = cifs_atomic_open,
 886         .lookup = cifs_lookup,
 887         .getattr = cifs_getattr,
 888         .unlink = cifs_unlink,
 889         .link = cifs_hardlink,
 890         .mkdir = cifs_mkdir,
 891         .rmdir = cifs_rmdir,
 892         .rename2 = cifs_rename2,
 893         .permission = cifs_permission,
 894         .setattr = cifs_setattr,
 895         .symlink = cifs_symlink,
 896         .mknod   = cifs_mknod,
 897         .setxattr = generic_setxattr,
 898         .getxattr = generic_getxattr,
 899         .listxattr = cifs_listxattr,
 900         .removexattr = generic_removexattr,
 901 };
 902
 903 const struct inode_operations cifs_file_inode_ops = {
 904         .setattr = cifs_setattr,
 905         .getattr = cifs_getattr,
 906         .permission = cifs_permission,
 907         .setxattr = generic_setxattr,
 908         .getxattr = generic_getxattr,
 909         .listxattr = cifs_listxattr,
 910         .removexattr = generic_removexattr,
 911 };
 912
 913 const struct inode_operations cifs_symlink_inode_ops = {
 914         .readlink = generic_readlink,
 915         .get_link = cifs_get_link,
 916         .permission = cifs_permission,
 917         .setxattr = generic_setxattr,
 918         .getxattr = generic_getxattr,
 919         .listxattr = cifs_listxattr,
 920         .removexattr = generic_removexattr,
 921 };
 922
 923 static int cifs_clone_file_range(struct file *src_file, loff_t off,
 924                 struct file *dst_file, loff_t destoff, u64 len)
 925 {
 926         struct inode *src_inode = file_inode(src_file);
 927         struct inode *target_inode = file_inode(dst_file);
 928         struct cifsFileInfo *smb_file_src = src_file->private_data;
 929         struct cifsFileInfo *smb_file_target = dst_file->private_data;
 930         struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
 931         unsigned int xid;
 932         int rc;
 933
 934         cifs_dbg(FYI, "clone range\n");
 935
 936         xid = get_xid();
 937
 938         if (!src_file->private_data || !dst_file->private_data) {
 939                 rc = -EBADF;
 940                 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
 941                 goto out;
 942         }
 943
 944         /*
 945          * Note: cifs case is easier than btrfs since server responsible for
 946          * checks for proper open modes and file type and if it wants
 947          * server could even support copy of range where source = target
 948          */
 949         lock_two_nondirectories(target_inode, src_inode);
 950
 951         if (len == 0)
 952                 len = src_inode->i_size - off;
 953
 954         cifs_dbg(FYI, "about to flush pages\n");
 955         /* should we flush first and last page first */
 956         truncate_inode_pages_range(&target_inode->i_data, destoff,
 957                                    PAGE_ALIGN(destoff + len)-1);
 958
 959         if (target_tcon->ses->server->ops->duplicate_extents)
 960                 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
 961                         smb_file_src, smb_file_target, off, len, destoff);
 962         else
 963                 rc = -EOPNOTSUPP;
 964
 965         /* force revalidate of size and timestamps of target file now
 966            that target is updated on the server */
 967         CIFS_I(target_inode)->time = 0;
 968         /* although unlocking in the reverse order from locking is not
 969            strictly necessary here it is a little cleaner to be consistent */
 970         unlock_two_nondirectories(src_inode, target_inode);
 971 out:
 972         free_xid(xid);
 973         return rc;
 974 }
 975
 976 const struct file_operations cifs_file_ops = {
 977         .read_iter = cifs_loose_read_iter,
 978         .write_iter = cifs_file_write_iter,
 979         .open = cifs_open,
 980         .release = cifs_close,
 981         .lock = cifs_lock,
 982         .fsync = cifs_fsync,
 983         .flush = cifs_flush,
 984         .mmap  = cifs_file_mmap,
 985         .splice_read = generic_file_splice_read,
 986         .llseek = cifs_llseek,
 987         .unlocked_ioctl = cifs_ioctl,
 988         .clone_file_range = cifs_clone_file_range,
 989         .setlease = cifs_setlease,
 990         .fallocate = cifs_fallocate,
 991 };
 992
 993 const struct file_operations cifs_file_strict_ops = {
 994         .read_iter = cifs_strict_readv,
 995         .write_iter = cifs_strict_writev,
 996         .open = cifs_open,
 997         .release = cifs_close,
 998         .lock = cifs_lock,
 999         .fsync = cifs_strict_fsync,
1000         .flush = cifs_flush,
1001         .mmap = cifs_file_strict_mmap,
1002         .splice_read = generic_file_splice_read,
1003         .llseek = cifs_llseek,
1004         .unlocked_ioctl = cifs_ioctl,
1005         .clone_file_range = cifs_clone_file_range,
1006         .setlease = cifs_setlease,
1007         .fallocate = cifs_fallocate,
1008 };
1009
1010 const struct file_operations cifs_file_direct_ops = {
1011         /* BB reevaluate whether they can be done with directio, no cache */
1012         .read_iter = cifs_user_readv,
1013         .write_iter = cifs_user_writev,
1014         .open = cifs_open,
1015         .release = cifs_close,
1016         .lock = cifs_lock,
1017         .fsync = cifs_fsync,
1018         .flush = cifs_flush,
1019         .mmap = cifs_file_mmap,
1020         .splice_read = generic_file_splice_read,
1021         .unlocked_ioctl  = cifs_ioctl,
1022         .clone_file_range = cifs_clone_file_range,
1023         .llseek = cifs_llseek,
1024         .setlease = cifs_setlease,
1025         .fallocate = cifs_fallocate,
1026 };
1027
1028 const struct file_operations cifs_file_nobrl_ops = {
1029         .read_iter = cifs_loose_read_iter,
1030         .write_iter = cifs_file_write_iter,
1031         .open = cifs_open,
1032         .release = cifs_close,
1033         .fsync = cifs_fsync,
1034         .flush = cifs_flush,
1035         .mmap  = cifs_file_mmap,
1036         .splice_read = generic_file_splice_read,
1037         .llseek = cifs_llseek,
1038         .unlocked_ioctl = cifs_ioctl,
1039         .clone_file_range = cifs_clone_file_range,
1040         .setlease = cifs_setlease,
1041         .fallocate = cifs_fallocate,
1042 };
1043
1044 const struct file_operations cifs_file_strict_nobrl_ops = {
1045         .read_iter = cifs_strict_readv,
1046         .write_iter = cifs_strict_writev,
1047         .open = cifs_open,
1048         .release = cifs_close,
1049         .fsync = cifs_strict_fsync,
1050         .flush = cifs_flush,
1051         .mmap = cifs_file_strict_mmap,
1052         .splice_read = generic_file_splice_read,
1053         .llseek = cifs_llseek,
1054         .unlocked_ioctl = cifs_ioctl,
1055         .clone_file_range = cifs_clone_file_range,
1056         .setlease = cifs_setlease,
1057         .fallocate = cifs_fallocate,
1058 };
1059
1060 const struct file_operations cifs_file_direct_nobrl_ops = {
1061         /* BB reevaluate whether they can be done with directio, no cache */
1062         .read_iter = cifs_user_readv,
1063         .write_iter = cifs_user_writev,
1064         .open = cifs_open,
1065         .release = cifs_close,
1066         .fsync = cifs_fsync,
1067         .flush = cifs_flush,
1068         .mmap = cifs_file_mmap,
1069         .splice_read = generic_file_splice_read,
1070         .unlocked_ioctl  = cifs_ioctl,
1071         .clone_file_range = cifs_clone_file_range,
1072         .llseek = cifs_llseek,
1073         .setlease = cifs_setlease,
1074         .fallocate = cifs_fallocate,
1075 };
1076
1077 const struct file_operations cifs_dir_ops = {
1078         .iterate_shared = cifs_readdir,
1079         .release = cifs_closedir,
1080         .read    = generic_read_dir,
1081         .unlocked_ioctl  = cifs_ioctl,
1082         .clone_file_range = cifs_clone_file_range,
1083         .llseek = generic_file_llseek,
1084 };
1085
1086 static void
1087 cifs_init_once(void *inode)
1088 {
1089         struct cifsInodeInfo *cifsi = inode;
1090
1091         inode_init_once(&cifsi->vfs_inode);
1092         init_rwsem(&cifsi->lock_sem);
1093 }
1094
1095 static int __init
1096 cifs_init_inodecache(void)
1097 {
1098         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1099                                               sizeof(struct cifsInodeInfo),
1100                                               0, (SLAB_RECLAIM_ACCOUNT|
1101                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1102                                               cifs_init_once);
1103         if (cifs_inode_cachep == NULL)
1104                 return -ENOMEM;
1105
1106         return 0;
1107 }
1108
1109 static void
1110 cifs_destroy_inodecache(void)
1111 {
1112         /*
1113          * Make sure all delayed rcu free inodes are flushed before we
1114          * destroy cache.
1115          */
1116         rcu_barrier();
1117         kmem_cache_destroy(cifs_inode_cachep);
1118 }
1119
1120 static int
1121 cifs_init_request_bufs(void)
1122 {
1123         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1124 #ifdef CONFIG_CIFS_SMB2
1125         /*
1126          * SMB2 maximum header size is bigger than CIFS one - no problems to
1127          * allocate some more bytes for CIFS.
1128          */
1129         max_hdr_size = MAX_SMB2_HDR_SIZE;
1130 #endif
1131         if (CIFSMaxBufSize < 8192) {
1132         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1133         Unicode path name has to fit in any SMB/CIFS path based frames */
1134                 CIFSMaxBufSize = 8192;
1135         } else if (CIFSMaxBufSize > 1024*127) {
1136                 CIFSMaxBufSize = 1024 * 127;
1137         } else {
1138                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1139         }
1140 /*
1141         cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1142                  CIFSMaxBufSize, CIFSMaxBufSize);
1143 */
1144         cifs_req_cachep = kmem_cache_create("cifs_request",
1145                                             CIFSMaxBufSize + max_hdr_size, 0,
1146                                             SLAB_HWCACHE_ALIGN, NULL);
1147         if (cifs_req_cachep == NULL)
1148                 return -ENOMEM;
1149
1150         if (cifs_min_rcv < 1)
1151                 cifs_min_rcv = 1;
1152         else if (cifs_min_rcv > 64) {
1153                 cifs_min_rcv = 64;
1154                 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1155         }
1156
1157         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1158                                                   cifs_req_cachep);
1159
1160         if (cifs_req_poolp == NULL) {
1161                 kmem_cache_destroy(cifs_req_cachep);
1162                 return -ENOMEM;
1163         }
1164         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1165         almost all handle based requests (but not write response, nor is it
1166         sufficient for path based requests).  A smaller size would have
1167         been more efficient (compacting multiple slab items on one 4k page)
1168         for the case in which debug was on, but this larger size allows
1169         more SMBs to use small buffer alloc and is still much more
1170         efficient to alloc 1 per page off the slab compared to 17K (5page)
1171         alloc of large cifs buffers even when page debugging is on */
1172         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1173                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1174                         NULL);
1175         if (cifs_sm_req_cachep == NULL) {
1176                 mempool_destroy(cifs_req_poolp);
1177                 kmem_cache_destroy(cifs_req_cachep);
1178                 return -ENOMEM;
1179         }
1180
1181         if (cifs_min_small < 2)
1182                 cifs_min_small = 2;
1183         else if (cifs_min_small > 256) {
1184                 cifs_min_small = 256;
1185                 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1186         }
1187
1188         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1189                                                      cifs_sm_req_cachep);
1190
1191         if (cifs_sm_req_poolp == NULL) {
1192                 mempool_destroy(cifs_req_poolp);
1193                 kmem_cache_destroy(cifs_req_cachep);
1194                 kmem_cache_destroy(cifs_sm_req_cachep);
1195                 return -ENOMEM;
1196         }
1197
1198         return 0;
1199 }
1200
1201 static void
1202 cifs_destroy_request_bufs(void)
1203 {
1204         mempool_destroy(cifs_req_poolp);
1205         kmem_cache_destroy(cifs_req_cachep);
1206         mempool_destroy(cifs_sm_req_poolp);
1207         kmem_cache_destroy(cifs_sm_req_cachep);
1208 }
1209
1210 static int
1211 cifs_init_mids(void)
1212 {
1213         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1214                                             sizeof(struct mid_q_entry), 0,
1215                                             SLAB_HWCACHE_ALIGN, NULL);
1216         if (cifs_mid_cachep == NULL)
1217                 return -ENOMEM;
1218
1219         /* 3 is a reasonable minimum number of simultaneous operations */
1220         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1221         if (cifs_mid_poolp == NULL) {
1222                 kmem_cache_destroy(cifs_mid_cachep);
1223                 return -ENOMEM;
1224         }
1225
1226         return 0;
1227 }
1228
1229 static void
1230 cifs_destroy_mids(void)
1231 {
1232         mempool_destroy(cifs_mid_poolp);
1233         kmem_cache_destroy(cifs_mid_cachep);
1234 }
1235
1236 static int __init
1237 init_cifs(void)
1238 {
1239         int rc = 0;
1240         cifs_proc_init();
1241         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1242 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1243         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1244         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1245 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1246 /*
1247  *  Initialize Global counters
1248  */
1249         atomic_set(&sesInfoAllocCount, 0);
1250         atomic_set(&tconInfoAllocCount, 0);
1251         atomic_set(&tcpSesAllocCount, 0);
1252         atomic_set(&tcpSesReconnectCount, 0);
1253         atomic_set(&tconInfoReconnectCount, 0);
1254
1255         atomic_set(&bufAllocCount, 0);
1256         atomic_set(&smBufAllocCount, 0);
1257 #ifdef CONFIG_CIFS_STATS2
1258         atomic_set(&totBufAllocCount, 0);
1259         atomic_set(&totSmBufAllocCount, 0);
1260 #endif /* CONFIG_CIFS_STATS2 */
1261
1262         atomic_set(&midCount, 0);
1263         GlobalCurrentXid = 0;
1264         GlobalTotalActiveXid = 0;
1265         GlobalMaxActiveXid = 0;
1266         spin_lock_init(&cifs_tcp_ses_lock);
1267         spin_lock_init(&cifs_file_list_lock);
1268         spin_lock_init(&GlobalMid_Lock);
1269
1270         get_random_bytes(&cifs_lock_secret, sizeof(cifs_lock_secret));
1271
1272         if (cifs_max_pending < 2) {
1273                 cifs_max_pending = 2;
1274                 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1275         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1276                 cifs_max_pending = CIFS_MAX_REQ;
1277                 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1278                          CIFS_MAX_REQ);
1279         }
1280
1281         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1282         if (!cifsiod_wq) {
1283                 rc = -ENOMEM;
1284                 goto out_clean_proc;
1285         }
1286
1287         rc = cifs_fscache_register();
1288         if (rc)
1289                 goto out_destroy_wq;
1290
1291         rc = cifs_init_inodecache();
1292         if (rc)
1293                 goto out_unreg_fscache;
1294
1295         rc = cifs_init_mids();
1296         if (rc)
1297                 goto out_destroy_inodecache;
1298
1299         rc = cifs_init_request_bufs();
1300         if (rc)
1301                 goto out_destroy_mids;
1302
1303 #ifdef CONFIG_CIFS_UPCALL
1304         rc = init_cifs_spnego();
1305         if (rc)
1306                 goto out_destroy_request_bufs;
1307 #endif /* CONFIG_CIFS_UPCALL */
1308
1309 #ifdef CONFIG_CIFS_ACL
1310         rc = init_cifs_idmap();
1311         if (rc)
1312                 goto out_register_key_type;
1313 #endif /* CONFIG_CIFS_ACL */
1314
1315         rc = register_filesystem(&cifs_fs_type);
1316         if (rc)
1317                 goto out_init_cifs_idmap;
1318
1319         return 0;
1320
1321 out_init_cifs_idmap:
1322 #ifdef CONFIG_CIFS_ACL
1323         exit_cifs_idmap();
1324 out_register_key_type:
1325 #endif
1326 #ifdef CONFIG_CIFS_UPCALL
1327         exit_cifs_spnego();
1328 out_destroy_request_bufs:
1329 #endif
1330         cifs_destroy_request_bufs();
1331 out_destroy_mids:
1332         cifs_destroy_mids();
1333 out_destroy_inodecache:
1334         cifs_destroy_inodecache();
1335 out_unreg_fscache:
1336         cifs_fscache_unregister();
1337 out_destroy_wq:
1338         destroy_workqueue(cifsiod_wq);
1339 out_clean_proc:
1340         cifs_proc_clean();
1341         return rc;
1342 }
1343
1344 static void __exit
1345 exit_cifs(void)
1346 {
1347         cifs_dbg(NOISY, "exit_cifs\n");
1348         unregister_filesystem(&cifs_fs_type);
1349         cifs_dfs_release_automount_timer();
1350 #ifdef CONFIG_CIFS_ACL
1351         exit_cifs_idmap();
1352 #endif
1353 #ifdef CONFIG_CIFS_UPCALL
1354         unregister_key_type(&cifs_spnego_key_type);
1355 #endif
1356         cifs_destroy_request_bufs();
1357         cifs_destroy_mids();
1358         cifs_destroy_inodecache();
1359         cifs_fscache_unregister();
1360         destroy_workqueue(cifsiod_wq);
1361         cifs_proc_clean();
1362 }
1363
1364 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1365 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1366 MODULE_DESCRIPTION
1367     ("VFS to access servers complying with the SNIA CIFS Specification "
1368      "e.g. Samba and Windows");
1369 MODULE_VERSION(CIFS_VERSION);
1370 module_init(init_cifs)
1371 module_exit(exit_cifs)