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         if (volume_info->prepath) {
 693                 cifs_sb->prepath = kstrdup(volume_info->prepath, GFP_KERNEL);
 694                 if (cifs_sb->prepath == NULL) {
 695                         root = ERR_PTR(-ENOMEM);
 696                         goto out_cifs_sb;
 697                 }
 698         }
 699
 700         cifs_setup_cifs_sb(volume_info, cifs_sb);
 701
 702         rc = cifs_mount(cifs_sb, volume_info);
 703         if (rc) {
 704                 if (!(flags & MS_SILENT))
 705                         cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
 706                                  rc);
 707                 root = ERR_PTR(rc);
 708                 goto out_mountdata;
 709         }
 710
 711         mnt_data.vol = volume_info;
 712         mnt_data.cifs_sb = cifs_sb;
 713         mnt_data.flags = flags;
 714
 715         /* BB should we make this contingent on mount parm? */
 716         flags |= MS_NODIRATIME | MS_NOATIME;
 717
 718         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 719         if (IS_ERR(sb)) {
 720                 root = ERR_CAST(sb);
 721                 cifs_umount(cifs_sb);
 722                 goto out;
 723         }
 724
 725         if (sb->s_root) {
 726                 cifs_dbg(FYI, "Use existing superblock\n");
 727                 cifs_umount(cifs_sb);
 728         } else {
 729                 rc = cifs_read_super(sb);
 730                 if (rc) {
 731                         root = ERR_PTR(rc);
 732                         goto out_super;
 733                 }
 734
 735                 sb->s_flags |= MS_ACTIVE;
 736         }
 737
 738         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
 739                 root = dget(sb->s_root);
 740         else
 741                 root = cifs_get_root(volume_info, sb);
 742
 743         if (IS_ERR(root))
 744                 goto out_super;
 745
 746         cifs_dbg(FYI, "dentry root is: %p\n", root);
 747         goto out;
 748
 749 out_super:
 750         deactivate_locked_super(sb);
 751 out:
 752         cifs_cleanup_volume_info(volume_info);
 753         return root;
 754
 755 out_mountdata:
 756         kfree(cifs_sb->mountdata);
 757 out_cifs_sb:
 758         kfree(cifs_sb);
 759 out_nls:
 760         unload_nls(volume_info->local_nls);
 761         goto out;
 762 }
 763
 764 static ssize_t
 765 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 766 {
 767         ssize_t rc;
 768         struct inode *inode = file_inode(iocb->ki_filp);
 769
 770         if (iocb->ki_filp->f_flags & O_DIRECT)
 771                 return cifs_user_readv(iocb, iter);
 772
 773         rc = cifs_revalidate_mapping(inode);
 774         if (rc)
 775                 return rc;
 776
 777         return generic_file_read_iter(iocb, iter);
 778 }
 779
 780 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 781 {
 782         struct inode *inode = file_inode(iocb->ki_filp);
 783         struct cifsInodeInfo *cinode = CIFS_I(inode);
 784         ssize_t written;
 785         int rc;
 786
 787         if (iocb->ki_filp->f_flags & O_DIRECT) {
 788                 written = cifs_user_writev(iocb, from);
 789                 if (written > 0 && CIFS_CACHE_READ(cinode)) {
 790                         cifs_zap_mapping(inode);
 791                         cifs_dbg(FYI,
 792                                  "Set no oplock for inode=%p after a write operation\n",
 793                                  inode);
 794                         cinode->oplock = 0;
 795                 }
 796                 return written;
 797         }
 798
 799         written = cifs_get_writer(cinode);
 800         if (written)
 801                 return written;
 802
 803         written = generic_file_write_iter(iocb, from);
 804
 805         if (CIFS_CACHE_WRITE(CIFS_I(inode)))
 806                 goto out;
 807
 808         rc = filemap_fdatawrite(inode->i_mapping);
 809         if (rc)
 810                 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
 811                          rc, inode);
 812
 813 out:
 814         cifs_put_writer(cinode);
 815         return written;
 816 }
 817
 818 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
 819 {
 820         /*
 821          * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 822          * the cached file length
 823          */
 824         if (whence != SEEK_SET && whence != SEEK_CUR) {
 825                 int rc;
 826                 struct inode *inode = file_inode(file);
 827
 828                 /*
 829                  * We need to be sure that all dirty pages are written and the
 830                  * server has the newest file length.
 831                  */
 832                 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
 833                     inode->i_mapping->nrpages != 0) {
 834                         rc = filemap_fdatawait(inode->i_mapping);
 835                         if (rc) {
 836                                 mapping_set_error(inode->i_mapping, rc);
 837                                 return rc;
 838                         }
 839                 }
 840                 /*
 841                  * Some applications poll for the file length in this strange
 842                  * way so we must seek to end on non-oplocked files by
 843                  * setting the revalidate time to zero.
 844                  */
 845                 CIFS_I(inode)->time = 0;
 846
 847                 rc = cifs_revalidate_file_attr(file);
 848                 if (rc < 0)
 849                         return (loff_t)rc;
 850         }
 851         return generic_file_llseek(file, offset, whence);
 852 }
 853
 854 static int
 855 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
 856 {
 857         /*
 858          * Note that this is called by vfs setlease with i_lock held to
 859          * protect *lease from going away.
 860          */
 861         struct inode *inode = file_inode(file);
 862         struct cifsFileInfo *cfile = file->private_data;
 863
 864         if (!(S_ISREG(inode->i_mode)))
 865                 return -EINVAL;
 866
 867         /* Check if file is oplocked if this is request for new lease */
 868         if (arg == F_UNLCK ||
 869             ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
 870             ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
 871                 return generic_setlease(file, arg, lease, priv);
 872         else if (tlink_tcon(cfile->tlink)->local_lease &&
 873                  !CIFS_CACHE_READ(CIFS_I(inode)))
 874                 /*
 875                  * If the server claims to support oplock on this file, then we
 876                  * still need to check oplock even if the local_lease mount
 877                  * option is set, but there are servers which do not support
 878                  * oplock for which this mount option may be useful if the user
 879                  * knows that the file won't be changed on the server by anyone
 880                  * else.
 881                  */
 882                 return generic_setlease(file, arg, lease, priv);
 883         else
 884                 return -EAGAIN;
 885 }
 886
 887 struct file_system_type cifs_fs_type = {
 888         .owner = THIS_MODULE,
 889         .name = "cifs",
 890         .mount = cifs_do_mount,
 891         .kill_sb = cifs_kill_sb,
 892         /*  .fs_flags */
 893 };
 894 MODULE_ALIAS_FS("cifs");
 895 const struct inode_operations cifs_dir_inode_ops = {
 896         .create = cifs_create,
 897         .atomic_open = cifs_atomic_open,
 898         .lookup = cifs_lookup,
 899         .getattr = cifs_getattr,
 900         .unlink = cifs_unlink,
 901         .link = cifs_hardlink,
 902         .mkdir = cifs_mkdir,
 903         .rmdir = cifs_rmdir,
 904         .rename2 = cifs_rename2,
 905         .permission = cifs_permission,
 906         .setattr = cifs_setattr,
 907         .symlink = cifs_symlink,
 908         .mknod   = cifs_mknod,
 909         .setxattr = generic_setxattr,
 910         .getxattr = generic_getxattr,
 911         .listxattr = cifs_listxattr,
 912         .removexattr = generic_removexattr,
 913 };
 914
 915 const struct inode_operations cifs_file_inode_ops = {
 916         .setattr = cifs_setattr,
 917         .getattr = cifs_getattr,
 918         .permission = cifs_permission,
 919         .setxattr = generic_setxattr,
 920         .getxattr = generic_getxattr,
 921         .listxattr = cifs_listxattr,
 922         .removexattr = generic_removexattr,
 923 };
 924
 925 const struct inode_operations cifs_symlink_inode_ops = {
 926         .readlink = generic_readlink,
 927         .get_link = cifs_get_link,
 928         .permission = cifs_permission,
 929         .setxattr = generic_setxattr,
 930         .getxattr = generic_getxattr,
 931         .listxattr = cifs_listxattr,
 932         .removexattr = generic_removexattr,
 933 };
 934
 935 static int cifs_clone_file_range(struct file *src_file, loff_t off,
 936                 struct file *dst_file, loff_t destoff, u64 len)
 937 {
 938         struct inode *src_inode = file_inode(src_file);
 939         struct inode *target_inode = file_inode(dst_file);
 940         struct cifsFileInfo *smb_file_src = src_file->private_data;
 941         struct cifsFileInfo *smb_file_target = dst_file->private_data;
 942         struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
 943         unsigned int xid;
 944         int rc;
 945
 946         cifs_dbg(FYI, "clone range\n");
 947
 948         xid = get_xid();
 949
 950         if (!src_file->private_data || !dst_file->private_data) {
 951                 rc = -EBADF;
 952                 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
 953                 goto out;
 954         }
 955
 956         /*
 957          * Note: cifs case is easier than btrfs since server responsible for
 958          * checks for proper open modes and file type and if it wants
 959          * server could even support copy of range where source = target
 960          */
 961         lock_two_nondirectories(target_inode, src_inode);
 962
 963         if (len == 0)
 964                 len = src_inode->i_size - off;
 965
 966         cifs_dbg(FYI, "about to flush pages\n");
 967         /* should we flush first and last page first */
 968         truncate_inode_pages_range(&target_inode->i_data, destoff,
 969                                    PAGE_ALIGN(destoff + len)-1);
 970
 971         if (target_tcon->ses->server->ops->duplicate_extents)
 972                 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
 973                         smb_file_src, smb_file_target, off, len, destoff);
 974         else
 975                 rc = -EOPNOTSUPP;
 976
 977         /* force revalidate of size and timestamps of target file now
 978            that target is updated on the server */
 979         CIFS_I(target_inode)->time = 0;
 980         /* although unlocking in the reverse order from locking is not
 981            strictly necessary here it is a little cleaner to be consistent */
 982         unlock_two_nondirectories(src_inode, target_inode);
 983 out:
 984         free_xid(xid);
 985         return rc;
 986 }
 987
 988 const struct file_operations cifs_file_ops = {
 989         .read_iter = cifs_loose_read_iter,
 990         .write_iter = cifs_file_write_iter,
 991         .open = cifs_open,
 992         .release = cifs_close,
 993         .lock = cifs_lock,
 994         .fsync = cifs_fsync,
 995         .flush = cifs_flush,
 996         .mmap  = cifs_file_mmap,
 997         .splice_read = generic_file_splice_read,
 998         .llseek = cifs_llseek,
 999         .unlocked_ioctl = cifs_ioctl,
1000         .clone_file_range = cifs_clone_file_range,
1001         .setlease = cifs_setlease,
1002         .fallocate = cifs_fallocate,
1003 };
1004
1005 const struct file_operations cifs_file_strict_ops = {
1006         .read_iter = cifs_strict_readv,
1007         .write_iter = cifs_strict_writev,
1008         .open = cifs_open,
1009         .release = cifs_close,
1010         .lock = cifs_lock,
1011         .fsync = cifs_strict_fsync,
1012         .flush = cifs_flush,
1013         .mmap = cifs_file_strict_mmap,
1014         .splice_read = generic_file_splice_read,
1015         .llseek = cifs_llseek,
1016         .unlocked_ioctl = cifs_ioctl,
1017         .clone_file_range = cifs_clone_file_range,
1018         .setlease = cifs_setlease,
1019         .fallocate = cifs_fallocate,
1020 };
1021
1022 const struct file_operations cifs_file_direct_ops = {
1023         /* BB reevaluate whether they can be done with directio, no cache */
1024         .read_iter = cifs_user_readv,
1025         .write_iter = cifs_user_writev,
1026         .open = cifs_open,
1027         .release = cifs_close,
1028         .lock = cifs_lock,
1029         .fsync = cifs_fsync,
1030         .flush = cifs_flush,
1031         .mmap = cifs_file_mmap,
1032         .splice_read = generic_file_splice_read,
1033         .unlocked_ioctl  = cifs_ioctl,
1034         .clone_file_range = cifs_clone_file_range,
1035         .llseek = cifs_llseek,
1036         .setlease = cifs_setlease,
1037         .fallocate = cifs_fallocate,
1038 };
1039
1040 const struct file_operations cifs_file_nobrl_ops = {
1041         .read_iter = cifs_loose_read_iter,
1042         .write_iter = cifs_file_write_iter,
1043         .open = cifs_open,
1044         .release = cifs_close,
1045         .fsync = cifs_fsync,
1046         .flush = cifs_flush,
1047         .mmap  = cifs_file_mmap,
1048         .splice_read = generic_file_splice_read,
1049         .llseek = cifs_llseek,
1050         .unlocked_ioctl = cifs_ioctl,
1051         .clone_file_range = cifs_clone_file_range,
1052         .setlease = cifs_setlease,
1053         .fallocate = cifs_fallocate,
1054 };
1055
1056 const struct file_operations cifs_file_strict_nobrl_ops = {
1057         .read_iter = cifs_strict_readv,
1058         .write_iter = cifs_strict_writev,
1059         .open = cifs_open,
1060         .release = cifs_close,
1061         .fsync = cifs_strict_fsync,
1062         .flush = cifs_flush,
1063         .mmap = cifs_file_strict_mmap,
1064         .splice_read = generic_file_splice_read,
1065         .llseek = cifs_llseek,
1066         .unlocked_ioctl = cifs_ioctl,
1067         .clone_file_range = cifs_clone_file_range,
1068         .setlease = cifs_setlease,
1069         .fallocate = cifs_fallocate,
1070 };
1071
1072 const struct file_operations cifs_file_direct_nobrl_ops = {
1073         /* BB reevaluate whether they can be done with directio, no cache */
1074         .read_iter = cifs_user_readv,
1075         .write_iter = cifs_user_writev,
1076         .open = cifs_open,
1077         .release = cifs_close,
1078         .fsync = cifs_fsync,
1079         .flush = cifs_flush,
1080         .mmap = cifs_file_mmap,
1081         .splice_read = generic_file_splice_read,
1082         .unlocked_ioctl  = cifs_ioctl,
1083         .clone_file_range = cifs_clone_file_range,
1084         .llseek = cifs_llseek,
1085         .setlease = cifs_setlease,
1086         .fallocate = cifs_fallocate,
1087 };
1088
1089 const struct file_operations cifs_dir_ops = {
1090         .iterate_shared = cifs_readdir,
1091         .release = cifs_closedir,
1092         .read    = generic_read_dir,
1093         .unlocked_ioctl  = cifs_ioctl,
1094         .clone_file_range = cifs_clone_file_range,
1095         .llseek = generic_file_llseek,
1096 };
1097
1098 static void
1099 cifs_init_once(void *inode)
1100 {
1101         struct cifsInodeInfo *cifsi = inode;
1102
1103         inode_init_once(&cifsi->vfs_inode);
1104         init_rwsem(&cifsi->lock_sem);
1105 }
1106
1107 static int __init
1108 cifs_init_inodecache(void)
1109 {
1110         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1111                                               sizeof(struct cifsInodeInfo),
1112                                               0, (SLAB_RECLAIM_ACCOUNT|
1113                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1114                                               cifs_init_once);
1115         if (cifs_inode_cachep == NULL)
1116                 return -ENOMEM;
1117
1118         return 0;
1119 }
1120
1121 static void
1122 cifs_destroy_inodecache(void)
1123 {
1124         /*
1125          * Make sure all delayed rcu free inodes are flushed before we
1126          * destroy cache.
1127          */
1128         rcu_barrier();
1129         kmem_cache_destroy(cifs_inode_cachep);
1130 }
1131
1132 static int
1133 cifs_init_request_bufs(void)
1134 {
1135         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1136 #ifdef CONFIG_CIFS_SMB2
1137         /*
1138          * SMB2 maximum header size is bigger than CIFS one - no problems to
1139          * allocate some more bytes for CIFS.
1140          */
1141         max_hdr_size = MAX_SMB2_HDR_SIZE;
1142 #endif
1143         if (CIFSMaxBufSize < 8192) {
1144         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1145         Unicode path name has to fit in any SMB/CIFS path based frames */
1146                 CIFSMaxBufSize = 8192;
1147         } else if (CIFSMaxBufSize > 1024*127) {
1148                 CIFSMaxBufSize = 1024 * 127;
1149         } else {
1150                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1151         }
1152 /*
1153         cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1154                  CIFSMaxBufSize, CIFSMaxBufSize);
1155 */
1156         cifs_req_cachep = kmem_cache_create("cifs_request",
1157                                             CIFSMaxBufSize + max_hdr_size, 0,
1158                                             SLAB_HWCACHE_ALIGN, NULL);
1159         if (cifs_req_cachep == NULL)
1160                 return -ENOMEM;
1161
1162         if (cifs_min_rcv < 1)
1163                 cifs_min_rcv = 1;
1164         else if (cifs_min_rcv > 64) {
1165                 cifs_min_rcv = 64;
1166                 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1167         }
1168
1169         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1170                                                   cifs_req_cachep);
1171
1172         if (cifs_req_poolp == NULL) {
1173                 kmem_cache_destroy(cifs_req_cachep);
1174                 return -ENOMEM;
1175         }
1176         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1177         almost all handle based requests (but not write response, nor is it
1178         sufficient for path based requests).  A smaller size would have
1179         been more efficient (compacting multiple slab items on one 4k page)
1180         for the case in which debug was on, but this larger size allows
1181         more SMBs to use small buffer alloc and is still much more
1182         efficient to alloc 1 per page off the slab compared to 17K (5page)
1183         alloc of large cifs buffers even when page debugging is on */
1184         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1185                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1186                         NULL);
1187         if (cifs_sm_req_cachep == NULL) {
1188                 mempool_destroy(cifs_req_poolp);
1189                 kmem_cache_destroy(cifs_req_cachep);
1190                 return -ENOMEM;
1191         }
1192
1193         if (cifs_min_small < 2)
1194                 cifs_min_small = 2;
1195         else if (cifs_min_small > 256) {
1196                 cifs_min_small = 256;
1197                 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1198         }
1199
1200         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1201                                                      cifs_sm_req_cachep);
1202
1203         if (cifs_sm_req_poolp == NULL) {
1204                 mempool_destroy(cifs_req_poolp);
1205                 kmem_cache_destroy(cifs_req_cachep);
1206                 kmem_cache_destroy(cifs_sm_req_cachep);
1207                 return -ENOMEM;
1208         }
1209
1210         return 0;
1211 }
1212
1213 static void
1214 cifs_destroy_request_bufs(void)
1215 {
1216         mempool_destroy(cifs_req_poolp);
1217         kmem_cache_destroy(cifs_req_cachep);
1218         mempool_destroy(cifs_sm_req_poolp);
1219         kmem_cache_destroy(cifs_sm_req_cachep);
1220 }
1221
1222 static int
1223 cifs_init_mids(void)
1224 {
1225         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1226                                             sizeof(struct mid_q_entry), 0,
1227                                             SLAB_HWCACHE_ALIGN, NULL);
1228         if (cifs_mid_cachep == NULL)
1229                 return -ENOMEM;
1230
1231         /* 3 is a reasonable minimum number of simultaneous operations */
1232         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1233         if (cifs_mid_poolp == NULL) {
1234                 kmem_cache_destroy(cifs_mid_cachep);
1235                 return -ENOMEM;
1236         }
1237
1238         return 0;
1239 }
1240
1241 static void
1242 cifs_destroy_mids(void)
1243 {
1244         mempool_destroy(cifs_mid_poolp);
1245         kmem_cache_destroy(cifs_mid_cachep);
1246 }
1247
1248 static int __init
1249 init_cifs(void)
1250 {
1251         int rc = 0;
1252         cifs_proc_init();
1253         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1254 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1255         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1256         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1257 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1258 /*
1259  *  Initialize Global counters
1260  */
1261         atomic_set(&sesInfoAllocCount, 0);
1262         atomic_set(&tconInfoAllocCount, 0);
1263         atomic_set(&tcpSesAllocCount, 0);
1264         atomic_set(&tcpSesReconnectCount, 0);
1265         atomic_set(&tconInfoReconnectCount, 0);
1266
1267         atomic_set(&bufAllocCount, 0);
1268         atomic_set(&smBufAllocCount, 0);
1269 #ifdef CONFIG_CIFS_STATS2
1270         atomic_set(&totBufAllocCount, 0);
1271         atomic_set(&totSmBufAllocCount, 0);
1272 #endif /* CONFIG_CIFS_STATS2 */
1273
1274         atomic_set(&midCount, 0);
1275         GlobalCurrentXid = 0;
1276         GlobalTotalActiveXid = 0;
1277         GlobalMaxActiveXid = 0;
1278         spin_lock_init(&cifs_tcp_ses_lock);
1279         spin_lock_init(&cifs_file_list_lock);
1280         spin_lock_init(&GlobalMid_Lock);
1281
1282         get_random_bytes(&cifs_lock_secret, sizeof(cifs_lock_secret));
1283
1284         if (cifs_max_pending < 2) {
1285                 cifs_max_pending = 2;
1286                 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1287         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1288                 cifs_max_pending = CIFS_MAX_REQ;
1289                 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1290                          CIFS_MAX_REQ);
1291         }
1292
1293         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1294         if (!cifsiod_wq) {
1295                 rc = -ENOMEM;
1296                 goto out_clean_proc;
1297         }
1298
1299         rc = cifs_fscache_register();
1300         if (rc)
1301                 goto out_destroy_wq;
1302
1303         rc = cifs_init_inodecache();
1304         if (rc)
1305                 goto out_unreg_fscache;
1306
1307         rc = cifs_init_mids();
1308         if (rc)
1309                 goto out_destroy_inodecache;
1310
1311         rc = cifs_init_request_bufs();
1312         if (rc)
1313                 goto out_destroy_mids;
1314
1315 #ifdef CONFIG_CIFS_UPCALL
1316         rc = init_cifs_spnego();
1317         if (rc)
1318                 goto out_destroy_request_bufs;
1319 #endif /* CONFIG_CIFS_UPCALL */
1320
1321 #ifdef CONFIG_CIFS_ACL
1322         rc = init_cifs_idmap();
1323         if (rc)
1324                 goto out_register_key_type;
1325 #endif /* CONFIG_CIFS_ACL */
1326
1327         rc = register_filesystem(&cifs_fs_type);
1328         if (rc)
1329                 goto out_init_cifs_idmap;
1330
1331         return 0;
1332
1333 out_init_cifs_idmap:
1334 #ifdef CONFIG_CIFS_ACL
1335         exit_cifs_idmap();
1336 out_register_key_type:
1337 #endif
1338 #ifdef CONFIG_CIFS_UPCALL
1339         exit_cifs_spnego();
1340 out_destroy_request_bufs:
1341 #endif
1342         cifs_destroy_request_bufs();
1343 out_destroy_mids:
1344         cifs_destroy_mids();
1345 out_destroy_inodecache:
1346         cifs_destroy_inodecache();
1347 out_unreg_fscache:
1348         cifs_fscache_unregister();
1349 out_destroy_wq:
1350         destroy_workqueue(cifsiod_wq);
1351 out_clean_proc:
1352         cifs_proc_clean();
1353         return rc;
1354 }
1355
1356 static void __exit
1357 exit_cifs(void)
1358 {
1359         cifs_dbg(NOISY, "exit_cifs\n");
1360         unregister_filesystem(&cifs_fs_type);
1361         cifs_dfs_release_automount_timer();
1362 #ifdef CONFIG_CIFS_ACL
1363         exit_cifs_idmap();
1364 #endif
1365 #ifdef CONFIG_CIFS_UPCALL
1366         unregister_key_type(&cifs_spnego_key_type);
1367 #endif
1368         cifs_destroy_request_bufs();
1369         cifs_destroy_mids();
1370         cifs_destroy_inodecache();
1371         cifs_fscache_unregister();
1372         destroy_workqueue(cifsiod_wq);
1373         cifs_proc_clean();
1374 }
1375
1376 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1377 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1378 MODULE_DESCRIPTION
1379     ("VFS to access servers complying with the SNIA CIFS Specification "
1380      "e.g. Samba and Windows");
1381 MODULE_VERSION(CIFS_VERSION);
1382 module_init(init_cifs)
1383 module_exit(exit_cifs)