fs/cifs/cifsfs.c

   1 /*
   2  *   fs/cifs/cifsfs.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2008
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   Common Internet FileSystem (CIFS) client
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 /* Note that BB means BUGBUG (ie something to fix eventually) */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/mount.h>
  29 #include <linux/slab.h>
  30 #include <linux/init.h>
  31 #include <linux/list.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/vfs.h>
  34 #include <linux/mempool.h>
  35 #include <linux/delay.h>
  36 #include <linux/kthread.h>
  37 #include <linux/freezer.h>
  38 #include <linux/namei.h>
  39 #include <linux/random.h>
  40 #include <net/ipv6.h>
  41 #include "cifsfs.h"
  42 #include "cifspdu.h"
  43 #define DECLARE_GLOBALS_HERE
  44 #include "cifsglob.h"
  45 #include "cifsproto.h"
  46 #include "cifs_debug.h"
  47 #include "cifs_fs_sb.h"
  48 #include <linux/mm.h>
  49 #include <linux/key-type.h>
  50 #include "cifs_spnego.h"
  51 #include "fscache.h"
  52 #ifdef CONFIG_CIFS_SMB2
  53 #include "smb2pdu.h"
  54 #endif
  55
  56 int cifsFYI = 0;
  57 int traceSMB = 0;
  58 bool enable_oplocks = true;
  59 unsigned int linuxExtEnabled = 1;
  60 unsigned int lookupCacheEnabled = 1;
  61 unsigned int global_secflags = CIFSSEC_DEF;
  62 /* unsigned int ntlmv2_support = 0; */
  63 unsigned int sign_CIFS_PDUs = 1;
  64 static const struct super_operations cifs_super_ops;
  65 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  66 module_param(CIFSMaxBufSize, uint, 0);
  67 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  68                                  "Default: 16384 Range: 8192 to 130048");
  69 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  70 module_param(cifs_min_rcv, uint, 0);
  71 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  72                                 "1 to 64");
  73 unsigned int cifs_min_small = 30;
  74 module_param(cifs_min_small, uint, 0);
  75 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  76                                  "Range: 2 to 256");
  77 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  78 module_param(cifs_max_pending, uint, 0444);
  79 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  80                                    "Default: 32767 Range: 2 to 32767.");
  81 module_param(enable_oplocks, bool, 0644);
  82 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
  83
  84 extern mempool_t *cifs_sm_req_poolp;
  85 extern mempool_t *cifs_req_poolp;
  86 extern mempool_t *cifs_mid_poolp;
  87
  88 struct workqueue_struct *cifsiod_wq;
  89
  90 /*
  91  * Bumps refcount for cifs super block.
  92  * Note that it should be only called if a referece to VFS super block is
  93  * already held, e.g. in open-type syscalls context. Otherwise it can race with
  94  * atomic_dec_and_test in deactivate_locked_super.
  95  */
  96 void
  97 cifs_sb_active(struct super_block *sb)
  98 {
  99         struct cifs_sb_info *server = CIFS_SB(sb);
 100
 101         if (atomic_inc_return(&server->active) == 1)
 102                 atomic_inc(&sb->s_active);
 103 }
 104
 105 void
 106 cifs_sb_deactive(struct super_block *sb)
 107 {
 108         struct cifs_sb_info *server = CIFS_SB(sb);
 109
 110         if (atomic_dec_and_test(&server->active))
 111                 deactivate_super(sb);
 112 }
 113
 114 static int
 115 cifs_read_super(struct super_block *sb)
 116 {
 117         struct inode *inode;
 118         struct cifs_sb_info *cifs_sb;
 119         struct cifs_tcon *tcon;
 120         int rc = 0;
 121
 122         cifs_sb = CIFS_SB(sb);
 123         tcon = cifs_sb_master_tcon(cifs_sb);
 124
 125         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
 126                 sb->s_flags |= MS_POSIXACL;
 127
 128         if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
 129                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 130         else
 131                 sb->s_maxbytes = MAX_NON_LFS;
 132
 133         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
 134         sb->s_time_gran = 100;
 135
 136         sb->s_magic = CIFS_MAGIC_NUMBER;
 137         sb->s_op = &cifs_super_ops;
 138         sb->s_bdi = &cifs_sb->bdi;
 139         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 140         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 141         inode = cifs_root_iget(sb);
 142
 143         if (IS_ERR(inode)) {
 144                 rc = PTR_ERR(inode);
 145                 goto out_no_root;
 146         }
 147
 148         if (tcon->nocase)
 149                 sb->s_d_op = &cifs_ci_dentry_ops;
 150         else
 151                 sb->s_d_op = &cifs_dentry_ops;
 152
 153         sb->s_root = d_make_root(inode);
 154         if (!sb->s_root) {
 155                 rc = -ENOMEM;
 156                 goto out_no_root;
 157         }
 158
 159 #ifdef CONFIG_CIFS_NFSD_EXPORT
 160         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 161                 cifs_dbg(FYI, "export ops supported\n");
 162                 sb->s_export_op = &cifs_export_ops;
 163         }
 164 #endif /* CONFIG_CIFS_NFSD_EXPORT */
 165
 166         return 0;
 167
 168 out_no_root:
 169         cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
 170         return rc;
 171 }
 172
 173 static void cifs_kill_sb(struct super_block *sb)
 174 {
 175         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 176         kill_anon_super(sb);
 177         cifs_umount(cifs_sb);
 178 }
 179
 180 static int
 181 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 182 {
 183         struct super_block *sb = dentry->d_sb;
 184         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 185         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 186         struct TCP_Server_Info *server = tcon->ses->server;
 187         unsigned int xid;
 188         int rc = 0;
 189
 190         xid = get_xid();
 191
 192         /*
 193          * PATH_MAX may be too long - it would presumably be total path,
 194          * but note that some servers (includinng Samba 3) have a shorter
 195          * maximum path.
 196          *
 197          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 198          */
 199         buf->f_namelen = PATH_MAX;
 200         buf->f_files = 0;       /* undefined */
 201         buf->f_ffree = 0;       /* unlimited */
 202
 203         if (server->ops->queryfs)
 204                 rc = server->ops->queryfs(xid, tcon, buf);
 205
 206         free_xid(xid);
 207         return 0;
 208 }
 209
 210 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
 211 {
 212         struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
 213         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 214         struct TCP_Server_Info *server = tcon->ses->server;
 215
 216         if (server->ops->fallocate)
 217                 return server->ops->fallocate(file, tcon, mode, off, len);
 218
 219         return -EOPNOTSUPP;
 220 }
 221
 222 static int cifs_permission(struct inode *inode, int mask)
 223 {
 224         struct cifs_sb_info *cifs_sb;
 225
 226         cifs_sb = CIFS_SB(inode->i_sb);
 227
 228         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 229                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 230                         return -EACCES;
 231                 else
 232                         return 0;
 233         } else /* file mode might have been restricted at mount time
 234                 on the client (above and beyond ACL on servers) for
 235                 servers which do not support setting and viewing mode bits,
 236                 so allowing client to check permissions is useful */
 237                 return generic_permission(inode, mask);
 238 }
 239
 240 static struct kmem_cache *cifs_inode_cachep;
 241 static struct kmem_cache *cifs_req_cachep;
 242 static struct kmem_cache *cifs_mid_cachep;
 243 static struct kmem_cache *cifs_sm_req_cachep;
 244 mempool_t *cifs_sm_req_poolp;
 245 mempool_t *cifs_req_poolp;
 246 mempool_t *cifs_mid_poolp;
 247
 248 static struct inode *
 249 cifs_alloc_inode(struct super_block *sb)
 250 {
 251         struct cifsInodeInfo *cifs_inode;
 252         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 253         if (!cifs_inode)
 254                 return NULL;
 255         cifs_inode->cifsAttrs = 0x20;   /* default */
 256         cifs_inode->time = 0;
 257         /*
 258          * Until the file is open and we have gotten oplock info back from the
 259          * server, can not assume caching of file data or metadata.
 260          */
 261         cifs_set_oplock_level(cifs_inode, 0);
 262         cifs_inode->flags = 0;
 263         spin_lock_init(&cifs_inode->writers_lock);
 264         cifs_inode->writers = 0;
 265         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 266         cifs_inode->server_eof = 0;
 267         cifs_inode->uniqueid = 0;
 268         cifs_inode->createtime = 0;
 269         cifs_inode->epoch = 0;
 270 #ifdef CONFIG_CIFS_SMB2
 271         get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
 272 #endif
 273         /*
 274          * Can not set i_flags here - they get immediately overwritten to zero
 275          * by the VFS.
 276          */
 277         /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
 278         INIT_LIST_HEAD(&cifs_inode->openFileList);
 279         INIT_LIST_HEAD(&cifs_inode->llist);
 280         return &cifs_inode->vfs_inode;
 281 }
 282
 283 static void cifs_i_callback(struct rcu_head *head)
 284 {
 285         struct inode *inode = container_of(head, struct inode, i_rcu);
 286         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 287 }
 288
 289 static void
 290 cifs_destroy_inode(struct inode *inode)
 291 {
 292         call_rcu(&inode->i_rcu, cifs_i_callback);
 293 }
 294
 295 static void
 296 cifs_evict_inode(struct inode *inode)
 297 {
 298         truncate_inode_pages_final(&inode->i_data);
 299         clear_inode(inode);
 300         cifs_fscache_release_inode_cookie(inode);
 301 }
 302
 303 static void
 304 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 305 {
 306         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 307         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 308
 309         seq_puts(s, ",addr=");
 310
 311         switch (server->dstaddr.ss_family) {
 312         case AF_INET:
 313                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 314                 break;
 315         case AF_INET6:
 316                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 317                 if (sa6->sin6_scope_id)
 318                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 319                 break;
 320         default:
 321                 seq_puts(s, "(unknown)");
 322         }
 323 }
 324
 325 static void
 326 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
 327 {
 328         if (ses->sectype == Unspecified) {
 329                 if (ses->user_name == NULL)
 330                         seq_puts(s, ",sec=none");
 331                 return;
 332         }
 333
 334         seq_puts(s, ",sec=");
 335
 336         switch (ses->sectype) {
 337         case LANMAN:
 338                 seq_puts(s, "lanman");
 339                 break;
 340         case NTLMv2:
 341                 seq_puts(s, "ntlmv2");
 342                 break;
 343         case NTLM:
 344                 seq_puts(s, "ntlm");
 345                 break;
 346         case Kerberos:
 347                 seq_puts(s, "krb5");
 348                 break;
 349         case RawNTLMSSP:
 350                 seq_puts(s, "ntlmssp");
 351                 break;
 352         default:
 353                 /* shouldn't ever happen */
 354                 seq_puts(s, "unknown");
 355                 break;
 356         }
 357
 358         if (ses->sign)
 359                 seq_puts(s, "i");
 360 }
 361
 362 static void
 363 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
 364 {
 365         seq_puts(s, ",cache=");
 366
 367         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
 368                 seq_puts(s, "strict");
 369         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 370                 seq_puts(s, "none");
 371         else
 372                 seq_puts(s, "loose");
 373 }
 374
 375 static void
 376 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
 377 {
 378         struct nls_table *def;
 379
 380         /* Display iocharset= option if it's not default charset */
 381         def = load_nls_default();
 382         if (def != cur)
 383                 seq_printf(s, ",iocharset=%s", cur->charset);
 384         unload_nls(def);
 385 }
 386
 387 /*
 388  * cifs_show_options() is for displaying mount options in /proc/mounts.
 389  * Not all settable options are displayed but most of the important
 390  * ones are.
 391  */
 392 static int
 393 cifs_show_options(struct seq_file *s, struct dentry *root)
 394 {
 395         struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
 396         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 397         struct sockaddr *srcaddr;
 398         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 399
 400         seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
 401         cifs_show_security(s, tcon->ses);
 402         cifs_show_cache_flavor(s, cifs_sb);
 403
 404         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 405                 seq_puts(s, ",multiuser");
 406         else if (tcon->ses->user_name)
 407                 seq_show_option(s, "username", tcon->ses->user_name);
 408
 409         if (tcon->ses->domainName)
 410                 seq_show_option(s, "domain", tcon->ses->domainName);
 411
 412         if (srcaddr->sa_family != AF_UNSPEC) {
 413                 struct sockaddr_in *saddr4;
 414                 struct sockaddr_in6 *saddr6;
 415                 saddr4 = (struct sockaddr_in *)srcaddr;
 416                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 417                 if (srcaddr->sa_family == AF_INET6)
 418                         seq_printf(s, ",srcaddr=%pI6c",
 419                                    &saddr6->sin6_addr);
 420                 else if (srcaddr->sa_family == AF_INET)
 421                         seq_printf(s, ",srcaddr=%pI4",
 422                                    &saddr4->sin_addr.s_addr);
 423                 else
 424                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 425                                    (int)(srcaddr->sa_family));
 426         }
 427
 428         seq_printf(s, ",uid=%u",
 429                    from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
 430         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 431                 seq_puts(s, ",forceuid");
 432         else
 433                 seq_puts(s, ",noforceuid");
 434
 435         seq_printf(s, ",gid=%u",
 436                    from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
 437         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 438                 seq_puts(s, ",forcegid");
 439         else
 440                 seq_puts(s, ",noforcegid");
 441
 442         cifs_show_address(s, tcon->ses->server);
 443
 444         if (!tcon->unix_ext)
 445                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 446                                            cifs_sb->mnt_file_mode,
 447                                            cifs_sb->mnt_dir_mode);
 448
 449         cifs_show_nls(s, cifs_sb->local_nls);
 450
 451         if (tcon->seal)
 452                 seq_puts(s, ",seal");
 453         if (tcon->nocase)
 454                 seq_puts(s, ",nocase");
 455         if (tcon->retry)
 456                 seq_puts(s, ",hard");
 457         if (tcon->use_persistent)
 458                 seq_puts(s, ",persistenthandles");
 459         else if (tcon->use_resilient)
 460                 seq_puts(s, ",resilienthandles");
 461         if (tcon->unix_ext)
 462                 seq_puts(s, ",unix");
 463         else
 464                 seq_puts(s, ",nounix");
 465         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 466                 seq_puts(s, ",posixpaths");
 467         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 468                 seq_puts(s, ",setuids");
 469         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 470                 seq_puts(s, ",serverino");
 471         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 472                 seq_puts(s, ",rwpidforward");
 473         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 474                 seq_puts(s, ",forcemand");
 475         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 476                 seq_puts(s, ",nouser_xattr");
 477         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 478                 seq_puts(s, ",mapchars");
 479         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
 480                 seq_puts(s, ",mapposix");
 481         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 482                 seq_puts(s, ",sfu");
 483         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 484                 seq_puts(s, ",nobrl");
 485         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 486                 seq_puts(s, ",cifsacl");
 487         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 488                 seq_puts(s, ",dynperm");
 489         if (root->d_sb->s_flags & MS_POSIXACL)
 490                 seq_puts(s, ",acl");
 491         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 492                 seq_puts(s, ",mfsymlinks");
 493         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 494                 seq_puts(s, ",fsc");
 495         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 496                 seq_puts(s, ",nostrictsync");
 497         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 498                 seq_puts(s, ",noperm");
 499         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 500                 seq_printf(s, ",backupuid=%u",
 501                            from_kuid_munged(&init_user_ns,
 502                                             cifs_sb->mnt_backupuid));
 503         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 504                 seq_printf(s, ",backupgid=%u",
 505                            from_kgid_munged(&init_user_ns,
 506                                             cifs_sb->mnt_backupgid));
 507
 508         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 509         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 510         seq_printf(s, ",echo_interval=%lu",
 511                         tcon->ses->server->echo_interval / HZ);
 512         /* convert actimeo and display it in seconds */
 513         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 514
 515         return 0;
 516 }
 517
 518 static void cifs_umount_begin(struct super_block *sb)
 519 {
 520         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 521         struct cifs_tcon *tcon;
 522
 523         if (cifs_sb == NULL)
 524                 return;
 525
 526         tcon = cifs_sb_master_tcon(cifs_sb);
 527
 528         spin_lock(&cifs_tcp_ses_lock);
 529         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 530                 /* we have other mounts to same share or we have
 531                    already tried to force umount this and woken up
 532                    all waiting network requests, nothing to do */
 533                 spin_unlock(&cifs_tcp_ses_lock);
 534                 return;
 535         } else if (tcon->tc_count == 1)
 536                 tcon->tidStatus = CifsExiting;
 537         spin_unlock(&cifs_tcp_ses_lock);
 538
 539         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 540         /* cancel_notify_requests(tcon); */
 541         if (tcon->ses && tcon->ses->server) {
 542                 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
 543                 wake_up_all(&tcon->ses->server->request_q);
 544                 wake_up_all(&tcon->ses->server->response_q);
 545                 msleep(1); /* yield */
 546                 /* we have to kick the requests once more */
 547                 wake_up_all(&tcon->ses->server->response_q);
 548                 msleep(1);
 549         }
 550
 551         return;
 552 }
 553
 554 #ifdef CONFIG_CIFS_STATS2
 555 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 556 {
 557         /* BB FIXME */
 558         return 0;
 559 }
 560 #endif
 561
 562 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 563 {
 564         sync_filesystem(sb);
 565         *flags |= MS_NODIRATIME;
 566         return 0;
 567 }
 568
 569 static int cifs_drop_inode(struct inode *inode)
 570 {
 571         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 572
 573         /* no serverino => unconditional eviction */
 574         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 575                 generic_drop_inode(inode);
 576 }
 577
 578 static const struct super_operations cifs_super_ops = {
 579         .statfs = cifs_statfs,
 580         .alloc_inode = cifs_alloc_inode,
 581         .destroy_inode = cifs_destroy_inode,
 582         .drop_inode     = cifs_drop_inode,
 583         .evict_inode    = cifs_evict_inode,
 584 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 585         function unless later we add lazy close of inodes or unless the
 586         kernel forgets to call us with the same number of releases (closes)
 587         as opens */
 588         .show_options = cifs_show_options,
 589         .umount_begin   = cifs_umount_begin,
 590         .remount_fs = cifs_remount,
 591 #ifdef CONFIG_CIFS_STATS2
 592         .show_stats = cifs_show_stats,
 593 #endif
 594 };
 595
 596 /*
 597  * Get root dentry from superblock according to prefix path mount option.
 598  * Return dentry with refcount + 1 on success and NULL otherwise.
 599  */
 600 static struct dentry *
 601 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 602 {
 603         struct dentry *dentry;
 604         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 605         char *full_path = NULL;
 606         char *s, *p;
 607         char sep;
 608
 609         full_path = cifs_build_path_to_root(vol, cifs_sb,
 610                                             cifs_sb_master_tcon(cifs_sb));
 611         if (full_path == NULL)
 612                 return ERR_PTR(-ENOMEM);
 613
 614         cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
 615
 616         sep = CIFS_DIR_SEP(cifs_sb);
 617         dentry = dget(sb->s_root);
 618         p = s = full_path;
 619
 620         do {
 621                 struct inode *dir = d_inode(dentry);
 622                 struct dentry *child;
 623
 624                 if (!dir) {
 625                         dput(dentry);
 626                         dentry = ERR_PTR(-ENOENT);
 627                         break;
 628                 }
 629                 if (!S_ISDIR(dir->i_mode)) {
 630                         dput(dentry);
 631                         dentry = ERR_PTR(-ENOTDIR);
 632                         break;
 633                 }
 634
 635                 /* skip separators */
 636                 while (*s == sep)
 637                         s++;
 638                 if (!*s)
 639                         break;
 640                 p = s++;
 641                 /* next separator */
 642                 while (*s && *s != sep)
 643                         s++;
 644
 645                 child = lookup_one_len_unlocked(p, dentry, s - p);
 646                 dput(dentry);
 647                 dentry = child;
 648         } while (!IS_ERR(dentry));
 649         kfree(full_path);
 650         return dentry;
 651 }
 652
 653 static int cifs_set_super(struct super_block *sb, void *data)
 654 {
 655         struct cifs_mnt_data *mnt_data = data;
 656         sb->s_fs_info = mnt_data->cifs_sb;
 657         return set_anon_super(sb, NULL);
 658 }
 659
 660 static struct dentry *
 661 cifs_do_mount(struct file_system_type *fs_type,
 662               int flags, const char *dev_name, void *data)
 663 {
 664         int rc;
 665         struct super_block *sb;
 666         struct cifs_sb_info *cifs_sb;
 667         struct smb_vol *volume_info;
 668         struct cifs_mnt_data mnt_data;
 669         struct dentry *root;
 670
 671         cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
 672
 673         volume_info = cifs_get_volume_info((char *)data, dev_name);
 674         if (IS_ERR(volume_info))
 675                 return ERR_CAST(volume_info);
 676
 677         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 678         if (cifs_sb == NULL) {
 679                 root = ERR_PTR(-ENOMEM);
 680                 goto out_nls;
 681         }
 682
 683         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 684         if (cifs_sb->mountdata == NULL) {
 685                 root = ERR_PTR(-ENOMEM);
 686                 goto out_cifs_sb;
 687         }
 688
 689         cifs_setup_cifs_sb(volume_info, cifs_sb);
 690
 691         rc = cifs_mount(cifs_sb, volume_info);
 692         if (rc) {
 693                 if (!(flags & MS_SILENT))
 694                         cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
 695                                  rc);
 696                 root = ERR_PTR(rc);
 697                 goto out_mountdata;
 698         }
 699
 700         mnt_data.vol = volume_info;
 701         mnt_data.cifs_sb = cifs_sb;
 702         mnt_data.flags = flags;
 703
 704         /* BB should we make this contingent on mount parm? */
 705         flags |= MS_NODIRATIME | MS_NOATIME;
 706
 707         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 708         if (IS_ERR(sb)) {
 709                 root = ERR_CAST(sb);
 710                 cifs_umount(cifs_sb);
 711                 goto out;
 712         }
 713
 714         if (sb->s_root) {
 715                 cifs_dbg(FYI, "Use existing superblock\n");
 716                 cifs_umount(cifs_sb);
 717         } else {
 718                 rc = cifs_read_super(sb);
 719                 if (rc) {
 720                         root = ERR_PTR(rc);
 721                         goto out_super;
 722                 }
 723
 724                 sb->s_flags |= MS_ACTIVE;
 725         }
 726
 727         root = cifs_get_root(volume_info, sb);
 728         if (IS_ERR(root))
 729                 goto out_super;
 730
 731         cifs_dbg(FYI, "dentry root is: %p\n", root);
 732         goto out;
 733
 734 out_super:
 735         deactivate_locked_super(sb);
 736 out:
 737         cifs_cleanup_volume_info(volume_info);
 738         return root;
 739
 740 out_mountdata:
 741         kfree(cifs_sb->mountdata);
 742 out_cifs_sb:
 743         kfree(cifs_sb);
 744 out_nls:
 745         unload_nls(volume_info->local_nls);
 746         goto out;
 747 }
 748
 749 static ssize_t
 750 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 751 {
 752         ssize_t rc;
 753         struct inode *inode = file_inode(iocb->ki_filp);
 754
 755         if (iocb->ki_filp->f_flags & O_DIRECT)
 756                 return cifs_user_readv(iocb, iter);
 757
 758         rc = cifs_revalidate_mapping(inode);
 759         if (rc)
 760                 return rc;
 761
 762         return generic_file_read_iter(iocb, iter);
 763 }
 764
 765 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 766 {
 767         struct inode *inode = file_inode(iocb->ki_filp);
 768         struct cifsInodeInfo *cinode = CIFS_I(inode);
 769         ssize_t written;
 770         int rc;
 771
 772         if (iocb->ki_filp->f_flags & O_DIRECT) {
 773                 written = cifs_user_writev(iocb, from);
 774                 if (written > 0 && CIFS_CACHE_READ(cinode)) {
 775                         cifs_zap_mapping(inode);
 776                         cifs_dbg(FYI,
 777                                  "Set no oplock for inode=%p after a write operation\n",
 778                                  inode);
 779                         cinode->oplock = 0;
 780                 }
 781                 return written;
 782         }
 783
 784         written = cifs_get_writer(cinode);
 785         if (written)
 786                 return written;
 787
 788         written = generic_file_write_iter(iocb, from);
 789
 790         if (CIFS_CACHE_WRITE(CIFS_I(inode)))
 791                 goto out;
 792
 793         rc = filemap_fdatawrite(inode->i_mapping);
 794         if (rc)
 795                 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
 796                          rc, inode);
 797
 798 out:
 799         cifs_put_writer(cinode);
 800         return written;
 801 }
 802
 803 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
 804 {
 805         /*
 806          * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 807          * the cached file length
 808          */
 809         if (whence != SEEK_SET && whence != SEEK_CUR) {
 810                 int rc;
 811                 struct inode *inode = file_inode(file);
 812
 813                 /*
 814                  * We need to be sure that all dirty pages are written and the
 815                  * server has the newest file length.
 816                  */
 817                 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
 818                     inode->i_mapping->nrpages != 0) {
 819                         rc = filemap_fdatawait(inode->i_mapping);
 820                         if (rc) {
 821                                 mapping_set_error(inode->i_mapping, rc);
 822                                 return rc;
 823                         }
 824                 }
 825                 /*
 826                  * Some applications poll for the file length in this strange
 827                  * way so we must seek to end on non-oplocked files by
 828                  * setting the revalidate time to zero.
 829                  */
 830                 CIFS_I(inode)->time = 0;
 831
 832                 rc = cifs_revalidate_file_attr(file);
 833                 if (rc < 0)
 834                         return (loff_t)rc;
 835         }
 836         return generic_file_llseek(file, offset, whence);
 837 }
 838
 839 static int
 840 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
 841 {
 842         /*
 843          * Note that this is called by vfs setlease with i_lock held to
 844          * protect *lease from going away.
 845          */
 846         struct inode *inode = file_inode(file);
 847         struct cifsFileInfo *cfile = file->private_data;
 848
 849         if (!(S_ISREG(inode->i_mode)))
 850                 return -EINVAL;
 851
 852         /* Check if file is oplocked if this is request for new lease */
 853         if (arg == F_UNLCK ||
 854             ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
 855             ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
 856                 return generic_setlease(file, arg, lease, priv);
 857         else if (tlink_tcon(cfile->tlink)->local_lease &&
 858                  !CIFS_CACHE_READ(CIFS_I(inode)))
 859                 /*
 860                  * If the server claims to support oplock on this file, then we
 861                  * still need to check oplock even if the local_lease mount
 862                  * option is set, but there are servers which do not support
 863                  * oplock for which this mount option may be useful if the user
 864                  * knows that the file won't be changed on the server by anyone
 865                  * else.
 866                  */
 867                 return generic_setlease(file, arg, lease, priv);
 868         else
 869                 return -EAGAIN;
 870 }
 871
 872 struct file_system_type cifs_fs_type = {
 873         .owner = THIS_MODULE,
 874         .name = "cifs",
 875         .mount = cifs_do_mount,
 876         .kill_sb = cifs_kill_sb,
 877         /*  .fs_flags */
 878 };
 879 MODULE_ALIAS_FS("cifs");
 880 const struct inode_operations cifs_dir_inode_ops = {
 881         .create = cifs_create,
 882         .atomic_open = cifs_atomic_open,
 883         .lookup = cifs_lookup,
 884         .getattr = cifs_getattr,
 885         .unlink = cifs_unlink,
 886         .link = cifs_hardlink,
 887         .mkdir = cifs_mkdir,
 888         .rmdir = cifs_rmdir,
 889         .rename2 = cifs_rename2,
 890         .permission = cifs_permission,
 891 /*      revalidate:cifs_revalidate,   */
 892         .setattr = cifs_setattr,
 893         .symlink = cifs_symlink,
 894         .mknod   = cifs_mknod,
 895 #ifdef CONFIG_CIFS_XATTR
 896         .setxattr = cifs_setxattr,
 897         .getxattr = cifs_getxattr,
 898         .listxattr = cifs_listxattr,
 899         .removexattr = cifs_removexattr,
 900 #endif
 901 };
 902
 903 const struct inode_operations cifs_file_inode_ops = {
 904 /*      revalidate:cifs_revalidate, */
 905         .setattr = cifs_setattr,
 906         .getattr = cifs_getattr, /* do we need this anymore? */
 907         .permission = cifs_permission,
 908 #ifdef CONFIG_CIFS_XATTR
 909         .setxattr = cifs_setxattr,
 910         .getxattr = cifs_getxattr,
 911         .listxattr = cifs_listxattr,
 912         .removexattr = cifs_removexattr,
 913 #endif
 914 };
 915
 916 const struct inode_operations cifs_symlink_inode_ops = {
 917         .readlink = generic_readlink,
 918         .get_link = cifs_get_link,
 919         .permission = cifs_permission,
 920         /* BB add the following two eventually */
 921         /* revalidate: cifs_revalidate,
 922            setattr:    cifs_notify_change, *//* BB do we need notify change */
 923 #ifdef CONFIG_CIFS_XATTR
 924         .setxattr = cifs_setxattr,
 925         .getxattr = cifs_getxattr,
 926         .listxattr = cifs_listxattr,
 927         .removexattr = cifs_removexattr,
 928 #endif
 929 };
 930
 931 static int cifs_clone_file_range(struct file *src_file, loff_t off,
 932                 struct file *dst_file, loff_t destoff, u64 len)
 933 {
 934         struct inode *src_inode = file_inode(src_file);
 935         struct inode *target_inode = file_inode(dst_file);
 936         struct cifsFileInfo *smb_file_src = src_file->private_data;
 937         struct cifsFileInfo *smb_file_target = dst_file->private_data;
 938         struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
 939         unsigned int xid;
 940         int rc;
 941
 942         cifs_dbg(FYI, "clone range\n");
 943
 944         xid = get_xid();
 945
 946         if (!src_file->private_data || !dst_file->private_data) {
 947                 rc = -EBADF;
 948                 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
 949                 goto out;
 950         }
 951
 952         /*
 953          * Note: cifs case is easier than btrfs since server responsible for
 954          * checks for proper open modes and file type and if it wants
 955          * server could even support copy of range where source = target
 956          */
 957         lock_two_nondirectories(target_inode, src_inode);
 958
 959         if (len == 0)
 960                 len = src_inode->i_size - off;
 961
 962         cifs_dbg(FYI, "about to flush pages\n");
 963         /* should we flush first and last page first */
 964         truncate_inode_pages_range(&target_inode->i_data, destoff,
 965                                    PAGE_CACHE_ALIGN(destoff + len)-1);
 966
 967         if (target_tcon->ses->server->ops->duplicate_extents)
 968                 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
 969                         smb_file_src, smb_file_target, off, len, destoff);
 970         else
 971                 rc = -EOPNOTSUPP;
 972
 973         /* force revalidate of size and timestamps of target file now
 974            that target is updated on the server */
 975         CIFS_I(target_inode)->time = 0;
 976         /* although unlocking in the reverse order from locking is not
 977            strictly necessary here it is a little cleaner to be consistent */
 978         unlock_two_nondirectories(src_inode, target_inode);
 979 out:
 980         free_xid(xid);
 981         return rc;
 982 }
 983
 984 const struct file_operations cifs_file_ops = {
 985         .read_iter = cifs_loose_read_iter,
 986         .write_iter = cifs_file_write_iter,
 987         .open = cifs_open,
 988         .release = cifs_close,
 989         .lock = cifs_lock,
 990         .fsync = cifs_fsync,
 991         .flush = cifs_flush,
 992         .mmap  = cifs_file_mmap,
 993         .splice_read = generic_file_splice_read,
 994         .llseek = cifs_llseek,
 995         .unlocked_ioctl = cifs_ioctl,
 996         .clone_file_range = cifs_clone_file_range,
 997         .setlease = cifs_setlease,
 998         .fallocate = cifs_fallocate,
 999 };
1000
1001 const struct file_operations cifs_file_strict_ops = {
1002         .read_iter = cifs_strict_readv,
1003         .write_iter = cifs_strict_writev,
1004         .open = cifs_open,
1005         .release = cifs_close,
1006         .lock = cifs_lock,
1007         .fsync = cifs_strict_fsync,
1008         .flush = cifs_flush,
1009         .mmap = cifs_file_strict_mmap,
1010         .splice_read = generic_file_splice_read,
1011         .llseek = cifs_llseek,
1012         .unlocked_ioctl = cifs_ioctl,
1013         .clone_file_range = cifs_clone_file_range,
1014         .clone_file_range = cifs_clone_file_range,
1015         .setlease = cifs_setlease,
1016         .fallocate = cifs_fallocate,
1017 };
1018
1019 const struct file_operations cifs_file_direct_ops = {
1020         /* BB reevaluate whether they can be done with directio, no cache */
1021         .read_iter = cifs_user_readv,
1022         .write_iter = cifs_user_writev,
1023         .open = cifs_open,
1024         .release = cifs_close,
1025         .lock = cifs_lock,
1026         .fsync = cifs_fsync,
1027         .flush = cifs_flush,
1028         .mmap = cifs_file_mmap,
1029         .splice_read = generic_file_splice_read,
1030         .unlocked_ioctl  = cifs_ioctl,
1031         .clone_file_range = cifs_clone_file_range,
1032         .llseek = cifs_llseek,
1033         .setlease = cifs_setlease,
1034         .fallocate = cifs_fallocate,
1035 };
1036
1037 const struct file_operations cifs_file_nobrl_ops = {
1038         .read_iter = cifs_loose_read_iter,
1039         .write_iter = cifs_file_write_iter,
1040         .open = cifs_open,
1041         .release = cifs_close,
1042         .fsync = cifs_fsync,
1043         .flush = cifs_flush,
1044         .mmap  = cifs_file_mmap,
1045         .splice_read = generic_file_splice_read,
1046         .llseek = cifs_llseek,
1047         .unlocked_ioctl = cifs_ioctl,
1048         .clone_file_range = cifs_clone_file_range,
1049         .setlease = cifs_setlease,
1050         .fallocate = cifs_fallocate,
1051 };
1052
1053 const struct file_operations cifs_file_strict_nobrl_ops = {
1054         .read_iter = cifs_strict_readv,
1055         .write_iter = cifs_strict_writev,
1056         .open = cifs_open,
1057         .release = cifs_close,
1058         .fsync = cifs_strict_fsync,
1059         .flush = cifs_flush,
1060         .mmap = cifs_file_strict_mmap,
1061         .splice_read = generic_file_splice_read,
1062         .llseek = cifs_llseek,
1063         .unlocked_ioctl = cifs_ioctl,
1064         .clone_file_range = cifs_clone_file_range,
1065         .setlease = cifs_setlease,
1066         .fallocate = cifs_fallocate,
1067 };
1068
1069 const struct file_operations cifs_file_direct_nobrl_ops = {
1070         /* BB reevaluate whether they can be done with directio, no cache */
1071         .read_iter = cifs_user_readv,
1072         .write_iter = cifs_user_writev,
1073         .open = cifs_open,
1074         .release = cifs_close,
1075         .fsync = cifs_fsync,
1076         .flush = cifs_flush,
1077         .mmap = cifs_file_mmap,
1078         .splice_read = generic_file_splice_read,
1079         .unlocked_ioctl  = cifs_ioctl,
1080         .clone_file_range = cifs_clone_file_range,
1081         .llseek = cifs_llseek,
1082         .setlease = cifs_setlease,
1083         .fallocate = cifs_fallocate,
1084 };
1085
1086 const struct file_operations cifs_dir_ops = {
1087         .iterate = cifs_readdir,
1088         .release = cifs_closedir,
1089         .read    = generic_read_dir,
1090         .unlocked_ioctl  = cifs_ioctl,
1091         .clone_file_range = cifs_clone_file_range,
1092         .llseek = generic_file_llseek,
1093 };
1094
1095 static void
1096 cifs_init_once(void *inode)
1097 {
1098         struct cifsInodeInfo *cifsi = inode;
1099
1100         inode_init_once(&cifsi->vfs_inode);
1101         init_rwsem(&cifsi->lock_sem);
1102 }
1103
1104 static int __init
1105 cifs_init_inodecache(void)
1106 {
1107         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1108                                               sizeof(struct cifsInodeInfo),
1109                                               0, (SLAB_RECLAIM_ACCOUNT|
1110                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1111                                               cifs_init_once);
1112         if (cifs_inode_cachep == NULL)
1113                 return -ENOMEM;
1114
1115         return 0;
1116 }
1117
1118 static void
1119 cifs_destroy_inodecache(void)
1120 {
1121         /*
1122          * Make sure all delayed rcu free inodes are flushed before we
1123          * destroy cache.
1124          */
1125         rcu_barrier();
1126         kmem_cache_destroy(cifs_inode_cachep);
1127 }
1128
1129 static int
1130 cifs_init_request_bufs(void)
1131 {
1132         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1133 #ifdef CONFIG_CIFS_SMB2
1134         /*
1135          * SMB2 maximum header size is bigger than CIFS one - no problems to
1136          * allocate some more bytes for CIFS.
1137          */
1138         max_hdr_size = MAX_SMB2_HDR_SIZE;
1139 #endif
1140         if (CIFSMaxBufSize < 8192) {
1141         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1142         Unicode path name has to fit in any SMB/CIFS path based frames */
1143                 CIFSMaxBufSize = 8192;
1144         } else if (CIFSMaxBufSize > 1024*127) {
1145                 CIFSMaxBufSize = 1024 * 127;
1146         } else {
1147                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1148         }
1149 /*
1150         cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1151                  CIFSMaxBufSize, CIFSMaxBufSize);
1152 */
1153         cifs_req_cachep = kmem_cache_create("cifs_request",
1154                                             CIFSMaxBufSize + max_hdr_size, 0,
1155                                             SLAB_HWCACHE_ALIGN, NULL);
1156         if (cifs_req_cachep == NULL)
1157                 return -ENOMEM;
1158
1159         if (cifs_min_rcv < 1)
1160                 cifs_min_rcv = 1;
1161         else if (cifs_min_rcv > 64) {
1162                 cifs_min_rcv = 64;
1163                 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1164         }
1165
1166         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1167                                                   cifs_req_cachep);
1168
1169         if (cifs_req_poolp == NULL) {
1170                 kmem_cache_destroy(cifs_req_cachep);
1171                 return -ENOMEM;
1172         }
1173         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1174         almost all handle based requests (but not write response, nor is it
1175         sufficient for path based requests).  A smaller size would have
1176         been more efficient (compacting multiple slab items on one 4k page)
1177         for the case in which debug was on, but this larger size allows
1178         more SMBs to use small buffer alloc and is still much more
1179         efficient to alloc 1 per page off the slab compared to 17K (5page)
1180         alloc of large cifs buffers even when page debugging is on */
1181         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1182                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1183                         NULL);
1184         if (cifs_sm_req_cachep == NULL) {
1185                 mempool_destroy(cifs_req_poolp);
1186                 kmem_cache_destroy(cifs_req_cachep);
1187                 return -ENOMEM;
1188         }
1189
1190         if (cifs_min_small < 2)
1191                 cifs_min_small = 2;
1192         else if (cifs_min_small > 256) {
1193                 cifs_min_small = 256;
1194                 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1195         }
1196
1197         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1198                                                      cifs_sm_req_cachep);
1199
1200         if (cifs_sm_req_poolp == NULL) {
1201                 mempool_destroy(cifs_req_poolp);
1202                 kmem_cache_destroy(cifs_req_cachep);
1203                 kmem_cache_destroy(cifs_sm_req_cachep);
1204                 return -ENOMEM;
1205         }
1206
1207         return 0;
1208 }
1209
1210 static void
1211 cifs_destroy_request_bufs(void)
1212 {
1213         mempool_destroy(cifs_req_poolp);
1214         kmem_cache_destroy(cifs_req_cachep);
1215         mempool_destroy(cifs_sm_req_poolp);
1216         kmem_cache_destroy(cifs_sm_req_cachep);
1217 }
1218
1219 static int
1220 cifs_init_mids(void)
1221 {
1222         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1223                                             sizeof(struct mid_q_entry), 0,
1224                                             SLAB_HWCACHE_ALIGN, NULL);
1225         if (cifs_mid_cachep == NULL)
1226                 return -ENOMEM;
1227
1228         /* 3 is a reasonable minimum number of simultaneous operations */
1229         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1230         if (cifs_mid_poolp == NULL) {
1231                 kmem_cache_destroy(cifs_mid_cachep);
1232                 return -ENOMEM;
1233         }
1234
1235         return 0;
1236 }
1237
1238 static void
1239 cifs_destroy_mids(void)
1240 {
1241         mempool_destroy(cifs_mid_poolp);
1242         kmem_cache_destroy(cifs_mid_cachep);
1243 }
1244
1245 static int __init
1246 init_cifs(void)
1247 {
1248         int rc = 0;
1249         cifs_proc_init();
1250         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1251 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1252         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1253         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1254 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1255 /*
1256  *  Initialize Global counters
1257  */
1258         atomic_set(&sesInfoAllocCount, 0);
1259         atomic_set(&tconInfoAllocCount, 0);
1260         atomic_set(&tcpSesAllocCount, 0);
1261         atomic_set(&tcpSesReconnectCount, 0);
1262         atomic_set(&tconInfoReconnectCount, 0);
1263
1264         atomic_set(&bufAllocCount, 0);
1265         atomic_set(&smBufAllocCount, 0);
1266 #ifdef CONFIG_CIFS_STATS2
1267         atomic_set(&totBufAllocCount, 0);
1268         atomic_set(&totSmBufAllocCount, 0);
1269 #endif /* CONFIG_CIFS_STATS2 */
1270
1271         atomic_set(&midCount, 0);
1272         GlobalCurrentXid = 0;
1273         GlobalTotalActiveXid = 0;
1274         GlobalMaxActiveXid = 0;
1275         spin_lock_init(&cifs_tcp_ses_lock);
1276         spin_lock_init(&cifs_file_list_lock);
1277         spin_lock_init(&GlobalMid_Lock);
1278
1279         if (cifs_max_pending < 2) {
1280                 cifs_max_pending = 2;
1281                 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1282         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1283                 cifs_max_pending = CIFS_MAX_REQ;
1284                 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1285                          CIFS_MAX_REQ);
1286         }
1287
1288         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1289         if (!cifsiod_wq) {
1290                 rc = -ENOMEM;
1291                 goto out_clean_proc;
1292         }
1293
1294         rc = cifs_fscache_register();
1295         if (rc)
1296                 goto out_destroy_wq;
1297
1298         rc = cifs_init_inodecache();
1299         if (rc)
1300                 goto out_unreg_fscache;
1301
1302         rc = cifs_init_mids();
1303         if (rc)
1304                 goto out_destroy_inodecache;
1305
1306         rc = cifs_init_request_bufs();
1307         if (rc)
1308                 goto out_destroy_mids;
1309
1310 #ifdef CONFIG_CIFS_UPCALL
1311         rc = register_key_type(&cifs_spnego_key_type);
1312         if (rc)
1313                 goto out_destroy_request_bufs;
1314 #endif /* CONFIG_CIFS_UPCALL */
1315
1316 #ifdef CONFIG_CIFS_ACL
1317         rc = init_cifs_idmap();
1318         if (rc)
1319                 goto out_register_key_type;
1320 #endif /* CONFIG_CIFS_ACL */
1321
1322         rc = register_filesystem(&cifs_fs_type);
1323         if (rc)
1324                 goto out_init_cifs_idmap;
1325
1326         return 0;
1327
1328 out_init_cifs_idmap:
1329 #ifdef CONFIG_CIFS_ACL
1330         exit_cifs_idmap();
1331 out_register_key_type:
1332 #endif
1333 #ifdef CONFIG_CIFS_UPCALL
1334         unregister_key_type(&cifs_spnego_key_type);
1335 out_destroy_request_bufs:
1336 #endif
1337         cifs_destroy_request_bufs();
1338 out_destroy_mids:
1339         cifs_destroy_mids();
1340 out_destroy_inodecache:
1341         cifs_destroy_inodecache();
1342 out_unreg_fscache:
1343         cifs_fscache_unregister();
1344 out_destroy_wq:
1345         destroy_workqueue(cifsiod_wq);
1346 out_clean_proc:
1347         cifs_proc_clean();
1348         return rc;
1349 }
1350
1351 static void __exit
1352 exit_cifs(void)
1353 {
1354         cifs_dbg(NOISY, "exit_cifs\n");
1355         unregister_filesystem(&cifs_fs_type);
1356         cifs_dfs_release_automount_timer();
1357 #ifdef CONFIG_CIFS_ACL
1358         exit_cifs_idmap();
1359 #endif
1360 #ifdef CONFIG_CIFS_UPCALL
1361         unregister_key_type(&cifs_spnego_key_type);
1362 #endif
1363         cifs_destroy_request_bufs();
1364         cifs_destroy_mids();
1365         cifs_destroy_inodecache();
1366         cifs_fscache_unregister();
1367         destroy_workqueue(cifsiod_wq);
1368         cifs_proc_clean();
1369 }
1370
1371 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1372 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1373 MODULE_DESCRIPTION
1374     ("VFS to access servers complying with the SNIA CIFS Specification "
1375      "e.g. Samba and Windows");
1376 MODULE_VERSION(CIFS_VERSION);
1377 module_init(init_cifs)
1378 module_exit(exit_cifs)