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                 inode_lock(dir);
 646                 child = lookup_one_len(p, dentry, s - p);
 647                 inode_unlock(dir);
 648                 dput(dentry);
 649                 dentry = child;
 650         } while (!IS_ERR(dentry));
 651         kfree(full_path);
 652         return dentry;
 653 }
 654
 655 static int cifs_set_super(struct super_block *sb, void *data)
 656 {
 657         struct cifs_mnt_data *mnt_data = data;
 658         sb->s_fs_info = mnt_data->cifs_sb;
 659         return set_anon_super(sb, NULL);
 660 }
 661
 662 static struct dentry *
 663 cifs_do_mount(struct file_system_type *fs_type,
 664               int flags, const char *dev_name, void *data)
 665 {
 666         int rc;
 667         struct super_block *sb;
 668         struct cifs_sb_info *cifs_sb;
 669         struct smb_vol *volume_info;
 670         struct cifs_mnt_data mnt_data;
 671         struct dentry *root;
 672
 673         cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
 674
 675         volume_info = cifs_get_volume_info((char *)data, dev_name);
 676         if (IS_ERR(volume_info))
 677                 return ERR_CAST(volume_info);
 678
 679         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 680         if (cifs_sb == NULL) {
 681                 root = ERR_PTR(-ENOMEM);
 682                 goto out_nls;
 683         }
 684
 685         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 686         if (cifs_sb->mountdata == NULL) {
 687                 root = ERR_PTR(-ENOMEM);
 688                 goto out_cifs_sb;
 689         }
 690
 691         cifs_setup_cifs_sb(volume_info, cifs_sb);
 692
 693         rc = cifs_mount(cifs_sb, volume_info);
 694         if (rc) {
 695                 if (!(flags & MS_SILENT))
 696                         cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
 697                                  rc);
 698                 root = ERR_PTR(rc);
 699                 goto out_mountdata;
 700         }
 701
 702         mnt_data.vol = volume_info;
 703         mnt_data.cifs_sb = cifs_sb;
 704         mnt_data.flags = flags;
 705
 706         /* BB should we make this contingent on mount parm? */
 707         flags |= MS_NODIRATIME | MS_NOATIME;
 708
 709         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 710         if (IS_ERR(sb)) {
 711                 root = ERR_CAST(sb);
 712                 cifs_umount(cifs_sb);
 713                 goto out;
 714         }
 715
 716         if (sb->s_root) {
 717                 cifs_dbg(FYI, "Use existing superblock\n");
 718                 cifs_umount(cifs_sb);
 719         } else {
 720                 rc = cifs_read_super(sb);
 721                 if (rc) {
 722                         root = ERR_PTR(rc);
 723                         goto out_super;
 724                 }
 725
 726                 sb->s_flags |= MS_ACTIVE;
 727         }
 728
 729         root = cifs_get_root(volume_info, sb);
 730         if (IS_ERR(root))
 731                 goto out_super;
 732
 733         cifs_dbg(FYI, "dentry root is: %p\n", root);
 734         goto out;
 735
 736 out_super:
 737         deactivate_locked_super(sb);
 738 out:
 739         cifs_cleanup_volume_info(volume_info);
 740         return root;
 741
 742 out_mountdata:
 743         kfree(cifs_sb->mountdata);
 744 out_cifs_sb:
 745         kfree(cifs_sb);
 746 out_nls:
 747         unload_nls(volume_info->local_nls);
 748         goto out;
 749 }
 750
 751 static ssize_t
 752 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 753 {
 754         ssize_t rc;
 755         struct inode *inode = file_inode(iocb->ki_filp);
 756
 757         if (iocb->ki_filp->f_flags & O_DIRECT)
 758                 return cifs_user_readv(iocb, iter);
 759
 760         rc = cifs_revalidate_mapping(inode);
 761         if (rc)
 762                 return rc;
 763
 764         return generic_file_read_iter(iocb, iter);
 765 }
 766
 767 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 768 {
 769         struct inode *inode = file_inode(iocb->ki_filp);
 770         struct cifsInodeInfo *cinode = CIFS_I(inode);
 771         ssize_t written;
 772         int rc;
 773
 774         if (iocb->ki_filp->f_flags & O_DIRECT) {
 775                 written = cifs_user_writev(iocb, from);
 776                 if (written > 0 && CIFS_CACHE_READ(cinode)) {
 777                         cifs_zap_mapping(inode);
 778                         cifs_dbg(FYI,
 779                                  "Set no oplock for inode=%p after a write operation\n",
 780                                  inode);
 781                         cinode->oplock = 0;
 782                 }
 783                 return written;
 784         }
 785
 786         written = cifs_get_writer(cinode);
 787         if (written)
 788                 return written;
 789
 790         written = generic_file_write_iter(iocb, from);
 791
 792         if (CIFS_CACHE_WRITE(CIFS_I(inode)))
 793                 goto out;
 794
 795         rc = filemap_fdatawrite(inode->i_mapping);
 796         if (rc)
 797                 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
 798                          rc, inode);
 799
 800 out:
 801         cifs_put_writer(cinode);
 802         return written;
 803 }
 804
 805 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
 806 {
 807         /*
 808          * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 809          * the cached file length
 810          */
 811         if (whence != SEEK_SET && whence != SEEK_CUR) {
 812                 int rc;
 813                 struct inode *inode = file_inode(file);
 814
 815                 /*
 816                  * We need to be sure that all dirty pages are written and the
 817                  * server has the newest file length.
 818                  */
 819                 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
 820                     inode->i_mapping->nrpages != 0) {
 821                         rc = filemap_fdatawait(inode->i_mapping);
 822                         if (rc) {
 823                                 mapping_set_error(inode->i_mapping, rc);
 824                                 return rc;
 825                         }
 826                 }
 827                 /*
 828                  * Some applications poll for the file length in this strange
 829                  * way so we must seek to end on non-oplocked files by
 830                  * setting the revalidate time to zero.
 831                  */
 832                 CIFS_I(inode)->time = 0;
 833
 834                 rc = cifs_revalidate_file_attr(file);
 835                 if (rc < 0)
 836                         return (loff_t)rc;
 837         }
 838         return generic_file_llseek(file, offset, whence);
 839 }
 840
 841 static int
 842 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
 843 {
 844         /*
 845          * Note that this is called by vfs setlease with i_lock held to
 846          * protect *lease from going away.
 847          */
 848         struct inode *inode = file_inode(file);
 849         struct cifsFileInfo *cfile = file->private_data;
 850
 851         if (!(S_ISREG(inode->i_mode)))
 852                 return -EINVAL;
 853
 854         /* Check if file is oplocked if this is request for new lease */
 855         if (arg == F_UNLCK ||
 856             ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
 857             ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
 858                 return generic_setlease(file, arg, lease, priv);
 859         else if (tlink_tcon(cfile->tlink)->local_lease &&
 860                  !CIFS_CACHE_READ(CIFS_I(inode)))
 861                 /*
 862                  * If the server claims to support oplock on this file, then we
 863                  * still need to check oplock even if the local_lease mount
 864                  * option is set, but there are servers which do not support
 865                  * oplock for which this mount option may be useful if the user
 866                  * knows that the file won't be changed on the server by anyone
 867                  * else.
 868                  */
 869                 return generic_setlease(file, arg, lease, priv);
 870         else
 871                 return -EAGAIN;
 872 }
 873
 874 struct file_system_type cifs_fs_type = {
 875         .owner = THIS_MODULE,
 876         .name = "cifs",
 877         .mount = cifs_do_mount,
 878         .kill_sb = cifs_kill_sb,
 879         /*  .fs_flags */
 880 };
 881 MODULE_ALIAS_FS("cifs");
 882 const struct inode_operations cifs_dir_inode_ops = {
 883         .create = cifs_create,
 884         .atomic_open = cifs_atomic_open,
 885         .lookup = cifs_lookup,
 886         .getattr = cifs_getattr,
 887         .unlink = cifs_unlink,
 888         .link = cifs_hardlink,
 889         .mkdir = cifs_mkdir,
 890         .rmdir = cifs_rmdir,
 891         .rename2 = cifs_rename2,
 892         .permission = cifs_permission,
 893 /*      revalidate:cifs_revalidate,   */
 894         .setattr = cifs_setattr,
 895         .symlink = cifs_symlink,
 896         .mknod   = cifs_mknod,
 897 #ifdef CONFIG_CIFS_XATTR
 898         .setxattr = cifs_setxattr,
 899         .getxattr = cifs_getxattr,
 900         .listxattr = cifs_listxattr,
 901         .removexattr = cifs_removexattr,
 902 #endif
 903 };
 904
 905 const struct inode_operations cifs_file_inode_ops = {
 906 /*      revalidate:cifs_revalidate, */
 907         .setattr = cifs_setattr,
 908         .getattr = cifs_getattr, /* do we need this anymore? */
 909         .permission = cifs_permission,
 910 #ifdef CONFIG_CIFS_XATTR
 911         .setxattr = cifs_setxattr,
 912         .getxattr = cifs_getxattr,
 913         .listxattr = cifs_listxattr,
 914         .removexattr = cifs_removexattr,
 915 #endif
 916 };
 917
 918 const struct inode_operations cifs_symlink_inode_ops = {
 919         .readlink = generic_readlink,
 920         .get_link = cifs_get_link,
 921         .permission = cifs_permission,
 922         /* BB add the following two eventually */
 923         /* revalidate: cifs_revalidate,
 924            setattr:    cifs_notify_change, *//* BB do we need notify change */
 925 #ifdef CONFIG_CIFS_XATTR
 926         .setxattr = cifs_setxattr,
 927         .getxattr = cifs_getxattr,
 928         .listxattr = cifs_listxattr,
 929         .removexattr = cifs_removexattr,
 930 #endif
 931 };
 932
 933 static int cifs_clone_file_range(struct file *src_file, loff_t off,
 934                 struct file *dst_file, loff_t destoff, u64 len)
 935 {
 936         struct inode *src_inode = file_inode(src_file);
 937         struct inode *target_inode = file_inode(dst_file);
 938         struct cifsFileInfo *smb_file_src = src_file->private_data;
 939         struct cifsFileInfo *smb_file_target = dst_file->private_data;
 940         struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
 941         unsigned int xid;
 942         int rc;
 943
 944         cifs_dbg(FYI, "clone range\n");
 945
 946         xid = get_xid();
 947
 948         if (!src_file->private_data || !dst_file->private_data) {
 949                 rc = -EBADF;
 950                 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
 951                 goto out;
 952         }
 953
 954         /*
 955          * Note: cifs case is easier than btrfs since server responsible for
 956          * checks for proper open modes and file type and if it wants
 957          * server could even support copy of range where source = target
 958          */
 959         lock_two_nondirectories(target_inode, src_inode);
 960
 961         if (len == 0)
 962                 len = src_inode->i_size - off;
 963
 964         cifs_dbg(FYI, "about to flush pages\n");
 965         /* should we flush first and last page first */
 966         truncate_inode_pages_range(&target_inode->i_data, destoff,
 967                                    PAGE_CACHE_ALIGN(destoff + len)-1);
 968
 969         if (target_tcon->ses->server->ops->duplicate_extents)
 970                 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
 971                         smb_file_src, smb_file_target, off, len, destoff);
 972         else
 973                 rc = -EOPNOTSUPP;
 974
 975         /* force revalidate of size and timestamps of target file now
 976            that target is updated on the server */
 977         CIFS_I(target_inode)->time = 0;
 978         /* although unlocking in the reverse order from locking is not
 979            strictly necessary here it is a little cleaner to be consistent */
 980         unlock_two_nondirectories(src_inode, target_inode);
 981 out:
 982         free_xid(xid);
 983         return rc;
 984 }
 985
 986 const struct file_operations cifs_file_ops = {
 987         .read_iter = cifs_loose_read_iter,
 988         .write_iter = cifs_file_write_iter,
 989         .open = cifs_open,
 990         .release = cifs_close,
 991         .lock = cifs_lock,
 992         .fsync = cifs_fsync,
 993         .flush = cifs_flush,
 994         .mmap  = cifs_file_mmap,
 995         .splice_read = generic_file_splice_read,
 996         .llseek = cifs_llseek,
 997         .unlocked_ioctl = cifs_ioctl,
 998         .clone_file_range = cifs_clone_file_range,
 999         .setlease = cifs_setlease,
1000         .fallocate = cifs_fallocate,
1001 };
1002
1003 const struct file_operations cifs_file_strict_ops = {
1004         .read_iter = cifs_strict_readv,
1005         .write_iter = cifs_strict_writev,
1006         .open = cifs_open,
1007         .release = cifs_close,
1008         .lock = cifs_lock,
1009         .fsync = cifs_strict_fsync,
1010         .flush = cifs_flush,
1011         .mmap = cifs_file_strict_mmap,
1012         .splice_read = generic_file_splice_read,
1013         .llseek = cifs_llseek,
1014         .unlocked_ioctl = cifs_ioctl,
1015         .clone_file_range = cifs_clone_file_range,
1016         .setlease = cifs_setlease,
1017         .fallocate = cifs_fallocate,
1018 };
1019
1020 const struct file_operations cifs_file_direct_ops = {
1021         /* BB reevaluate whether they can be done with directio, no cache */
1022         .read_iter = cifs_user_readv,
1023         .write_iter = cifs_user_writev,
1024         .open = cifs_open,
1025         .release = cifs_close,
1026         .lock = cifs_lock,
1027         .fsync = cifs_fsync,
1028         .flush = cifs_flush,
1029         .mmap = cifs_file_mmap,
1030         .splice_read = generic_file_splice_read,
1031         .unlocked_ioctl  = cifs_ioctl,
1032         .clone_file_range = cifs_clone_file_range,
1033         .llseek = cifs_llseek,
1034         .setlease = cifs_setlease,
1035         .fallocate = cifs_fallocate,
1036 };
1037
1038 const struct file_operations cifs_file_nobrl_ops = {
1039         .read_iter = cifs_loose_read_iter,
1040         .write_iter = cifs_file_write_iter,
1041         .open = cifs_open,
1042         .release = cifs_close,
1043         .fsync = cifs_fsync,
1044         .flush = cifs_flush,
1045         .mmap  = cifs_file_mmap,
1046         .splice_read = generic_file_splice_read,
1047         .llseek = cifs_llseek,
1048         .unlocked_ioctl = cifs_ioctl,
1049         .clone_file_range = cifs_clone_file_range,
1050         .setlease = cifs_setlease,
1051         .fallocate = cifs_fallocate,
1052 };
1053
1054 const struct file_operations cifs_file_strict_nobrl_ops = {
1055         .read_iter = cifs_strict_readv,
1056         .write_iter = cifs_strict_writev,
1057         .open = cifs_open,
1058         .release = cifs_close,
1059         .fsync = cifs_strict_fsync,
1060         .flush = cifs_flush,
1061         .mmap = cifs_file_strict_mmap,
1062         .splice_read = generic_file_splice_read,
1063         .llseek = cifs_llseek,
1064         .unlocked_ioctl = cifs_ioctl,
1065         .clone_file_range = cifs_clone_file_range,
1066         .setlease = cifs_setlease,
1067         .fallocate = cifs_fallocate,
1068 };
1069
1070 const struct file_operations cifs_file_direct_nobrl_ops = {
1071         /* BB reevaluate whether they can be done with directio, no cache */
1072         .read_iter = cifs_user_readv,
1073         .write_iter = cifs_user_writev,
1074         .open = cifs_open,
1075         .release = cifs_close,
1076         .fsync = cifs_fsync,
1077         .flush = cifs_flush,
1078         .mmap = cifs_file_mmap,
1079         .splice_read = generic_file_splice_read,
1080         .unlocked_ioctl  = cifs_ioctl,
1081         .clone_file_range = cifs_clone_file_range,
1082         .llseek = cifs_llseek,
1083         .setlease = cifs_setlease,
1084         .fallocate = cifs_fallocate,
1085 };
1086
1087 const struct file_operations cifs_dir_ops = {
1088         .iterate = cifs_readdir,
1089         .release = cifs_closedir,
1090         .read    = generic_read_dir,
1091         .unlocked_ioctl  = cifs_ioctl,
1092         .clone_file_range = cifs_clone_file_range,
1093         .llseek = generic_file_llseek,
1094 };
1095
1096 static void
1097 cifs_init_once(void *inode)
1098 {
1099         struct cifsInodeInfo *cifsi = inode;
1100
1101         inode_init_once(&cifsi->vfs_inode);
1102         init_rwsem(&cifsi->lock_sem);
1103 }
1104
1105 static int __init
1106 cifs_init_inodecache(void)
1107 {
1108         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1109                                               sizeof(struct cifsInodeInfo),
1110                                               0, (SLAB_RECLAIM_ACCOUNT|
1111                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1112                                               cifs_init_once);
1113         if (cifs_inode_cachep == NULL)
1114                 return -ENOMEM;
1115
1116         return 0;
1117 }
1118
1119 static void
1120 cifs_destroy_inodecache(void)
1121 {
1122         /*
1123          * Make sure all delayed rcu free inodes are flushed before we
1124          * destroy cache.
1125          */
1126         rcu_barrier();
1127         kmem_cache_destroy(cifs_inode_cachep);
1128 }
1129
1130 static int
1131 cifs_init_request_bufs(void)
1132 {
1133         size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1134 #ifdef CONFIG_CIFS_SMB2
1135         /*
1136          * SMB2 maximum header size is bigger than CIFS one - no problems to
1137          * allocate some more bytes for CIFS.
1138          */
1139         max_hdr_size = MAX_SMB2_HDR_SIZE;
1140 #endif
1141         if (CIFSMaxBufSize < 8192) {
1142         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1143         Unicode path name has to fit in any SMB/CIFS path based frames */
1144                 CIFSMaxBufSize = 8192;
1145         } else if (CIFSMaxBufSize > 1024*127) {
1146                 CIFSMaxBufSize = 1024 * 127;
1147         } else {
1148                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1149         }
1150 /*
1151         cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1152                  CIFSMaxBufSize, CIFSMaxBufSize);
1153 */
1154         cifs_req_cachep = kmem_cache_create("cifs_request",
1155                                             CIFSMaxBufSize + max_hdr_size, 0,
1156                                             SLAB_HWCACHE_ALIGN, NULL);
1157         if (cifs_req_cachep == NULL)
1158                 return -ENOMEM;
1159
1160         if (cifs_min_rcv < 1)
1161                 cifs_min_rcv = 1;
1162         else if (cifs_min_rcv > 64) {
1163                 cifs_min_rcv = 64;
1164                 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1165         }
1166
1167         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1168                                                   cifs_req_cachep);
1169
1170         if (cifs_req_poolp == NULL) {
1171                 kmem_cache_destroy(cifs_req_cachep);
1172                 return -ENOMEM;
1173         }
1174         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1175         almost all handle based requests (but not write response, nor is it
1176         sufficient for path based requests).  A smaller size would have
1177         been more efficient (compacting multiple slab items on one 4k page)
1178         for the case in which debug was on, but this larger size allows
1179         more SMBs to use small buffer alloc and is still much more
1180         efficient to alloc 1 per page off the slab compared to 17K (5page)
1181         alloc of large cifs buffers even when page debugging is on */
1182         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1183                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1184                         NULL);
1185         if (cifs_sm_req_cachep == NULL) {
1186                 mempool_destroy(cifs_req_poolp);
1187                 kmem_cache_destroy(cifs_req_cachep);
1188                 return -ENOMEM;
1189         }
1190
1191         if (cifs_min_small < 2)
1192                 cifs_min_small = 2;
1193         else if (cifs_min_small > 256) {
1194                 cifs_min_small = 256;
1195                 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1196         }
1197
1198         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1199                                                      cifs_sm_req_cachep);
1200
1201         if (cifs_sm_req_poolp == NULL) {
1202                 mempool_destroy(cifs_req_poolp);
1203                 kmem_cache_destroy(cifs_req_cachep);
1204                 kmem_cache_destroy(cifs_sm_req_cachep);
1205                 return -ENOMEM;
1206         }
1207
1208         return 0;
1209 }
1210
1211 static void
1212 cifs_destroy_request_bufs(void)
1213 {
1214         mempool_destroy(cifs_req_poolp);
1215         kmem_cache_destroy(cifs_req_cachep);
1216         mempool_destroy(cifs_sm_req_poolp);
1217         kmem_cache_destroy(cifs_sm_req_cachep);
1218 }
1219
1220 static int
1221 cifs_init_mids(void)
1222 {
1223         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1224                                             sizeof(struct mid_q_entry), 0,
1225                                             SLAB_HWCACHE_ALIGN, NULL);
1226         if (cifs_mid_cachep == NULL)
1227                 return -ENOMEM;
1228
1229         /* 3 is a reasonable minimum number of simultaneous operations */
1230         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1231         if (cifs_mid_poolp == NULL) {
1232                 kmem_cache_destroy(cifs_mid_cachep);
1233                 return -ENOMEM;
1234         }
1235
1236         return 0;
1237 }
1238
1239 static void
1240 cifs_destroy_mids(void)
1241 {
1242         mempool_destroy(cifs_mid_poolp);
1243         kmem_cache_destroy(cifs_mid_cachep);
1244 }
1245
1246 static int __init
1247 init_cifs(void)
1248 {
1249         int rc = 0;
1250         cifs_proc_init();
1251         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1252 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1253         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1254         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1255 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1256 /*
1257  *  Initialize Global counters
1258  */
1259         atomic_set(&sesInfoAllocCount, 0);
1260         atomic_set(&tconInfoAllocCount, 0);
1261         atomic_set(&tcpSesAllocCount, 0);
1262         atomic_set(&tcpSesReconnectCount, 0);
1263         atomic_set(&tconInfoReconnectCount, 0);
1264
1265         atomic_set(&bufAllocCount, 0);
1266         atomic_set(&smBufAllocCount, 0);
1267 #ifdef CONFIG_CIFS_STATS2
1268         atomic_set(&totBufAllocCount, 0);
1269         atomic_set(&totSmBufAllocCount, 0);
1270 #endif /* CONFIG_CIFS_STATS2 */
1271
1272         atomic_set(&midCount, 0);
1273         GlobalCurrentXid = 0;
1274         GlobalTotalActiveXid = 0;
1275         GlobalMaxActiveXid = 0;
1276         spin_lock_init(&cifs_tcp_ses_lock);
1277         spin_lock_init(&cifs_file_list_lock);
1278         spin_lock_init(&GlobalMid_Lock);
1279
1280         if (cifs_max_pending < 2) {
1281                 cifs_max_pending = 2;
1282                 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1283         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1284                 cifs_max_pending = CIFS_MAX_REQ;
1285                 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1286                          CIFS_MAX_REQ);
1287         }
1288
1289         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1290         if (!cifsiod_wq) {
1291                 rc = -ENOMEM;
1292                 goto out_clean_proc;
1293         }
1294
1295         rc = cifs_fscache_register();
1296         if (rc)
1297                 goto out_destroy_wq;
1298
1299         rc = cifs_init_inodecache();
1300         if (rc)
1301                 goto out_unreg_fscache;
1302
1303         rc = cifs_init_mids();
1304         if (rc)
1305                 goto out_destroy_inodecache;
1306
1307         rc = cifs_init_request_bufs();
1308         if (rc)
1309                 goto out_destroy_mids;
1310
1311 #ifdef CONFIG_CIFS_UPCALL
1312         rc = register_key_type(&cifs_spnego_key_type);
1313         if (rc)
1314                 goto out_destroy_request_bufs;
1315 #endif /* CONFIG_CIFS_UPCALL */
1316
1317 #ifdef CONFIG_CIFS_ACL
1318         rc = init_cifs_idmap();
1319         if (rc)
1320                 goto out_register_key_type;
1321 #endif /* CONFIG_CIFS_ACL */
1322
1323         rc = register_filesystem(&cifs_fs_type);
1324         if (rc)
1325                 goto out_init_cifs_idmap;
1326
1327         return 0;
1328
1329 out_init_cifs_idmap:
1330 #ifdef CONFIG_CIFS_ACL
1331         exit_cifs_idmap();
1332 out_register_key_type:
1333 #endif
1334 #ifdef CONFIG_CIFS_UPCALL
1335         unregister_key_type(&cifs_spnego_key_type);
1336 out_destroy_request_bufs:
1337 #endif
1338         cifs_destroy_request_bufs();
1339 out_destroy_mids:
1340         cifs_destroy_mids();
1341 out_destroy_inodecache:
1342         cifs_destroy_inodecache();
1343 out_unreg_fscache:
1344         cifs_fscache_unregister();
1345 out_destroy_wq:
1346         destroy_workqueue(cifsiod_wq);
1347 out_clean_proc:
1348         cifs_proc_clean();
1349         return rc;
1350 }
1351
1352 static void __exit
1353 exit_cifs(void)
1354 {
1355         cifs_dbg(NOISY, "exit_cifs\n");
1356         unregister_filesystem(&cifs_fs_type);
1357         cifs_dfs_release_automount_timer();
1358 #ifdef CONFIG_CIFS_ACL
1359         exit_cifs_idmap();
1360 #endif
1361 #ifdef CONFIG_CIFS_UPCALL
1362         unregister_key_type(&cifs_spnego_key_type);
1363 #endif
1364         cifs_destroy_request_bufs();
1365         cifs_destroy_mids();
1366         cifs_destroy_inodecache();
1367         cifs_fscache_unregister();
1368         destroy_workqueue(cifsiod_wq);
1369         cifs_proc_clean();
1370 }
1371
1372 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1373 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1374 MODULE_DESCRIPTION
1375     ("VFS to access servers complying with the SNIA CIFS Specification "
1376      "e.g. Samba and Windows");
1377 MODULE_VERSION(CIFS_VERSION);
1378 module_init(init_cifs)
1379 module_exit(exit_cifs)